From ea05d5c5f89f034a8d2c4151507f59a520535d9a Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol Date: Fri, 30 Aug 2019 19:50:48 +0200 Subject: Move out gtphub to its own subdir Change-Id: I707d5e9b775179e732d281ce3d245de83d648eea --- configure.ac | 1 + debian/copyright | 10 +- doc/examples/osmo-gtphub/gtphub-example.txt | 2 +- osmoappdesc.py | 2 +- src/Makefile.am | 1 + src/gprs/Makefile.am | 19 - src/gprs/gtphub.c | 2960 --------------------------- src/gprs/gtphub_ares.c | 220 -- src/gprs/gtphub_main.c | 403 ---- src/gprs/gtphub_sock.c | 60 - src/gprs/gtphub_vty.c | 613 ------ src/gtphub/Makefile.am | 45 + src/gtphub/gtphub.c | 2960 +++++++++++++++++++++++++++ src/gtphub/gtphub_ares.c | 220 ++ src/gtphub/gtphub_main.c | 403 ++++ src/gtphub/gtphub_sock.c | 60 + src/gtphub/gtphub_vty.c | 613 ++++++ tests/gtphub/Makefile.am | 2 +- 18 files changed, 4311 insertions(+), 4283 deletions(-) delete mode 100644 src/gprs/gtphub.c delete mode 100644 src/gprs/gtphub_ares.c delete mode 100644 src/gprs/gtphub_main.c delete mode 100644 src/gprs/gtphub_sock.c delete mode 100644 src/gprs/gtphub_vty.c create mode 100644 src/gtphub/Makefile.am create mode 100644 src/gtphub/gtphub.c create mode 100644 src/gtphub/gtphub_ares.c create mode 100644 src/gtphub/gtphub_main.c create mode 100644 src/gtphub/gtphub_sock.c create mode 100644 src/gtphub/gtphub_vty.c diff --git a/configure.ac b/configure.ac index 1c3f03b0a..667220412 100644 --- a/configure.ac +++ b/configure.ac @@ -248,6 +248,7 @@ AC_OUTPUT( src/Makefile src/gprs/Makefile src/gbproxy/Makefile + src/gtphub/Makefile tests/Makefile tests/atlocal tests/gprs/Makefile diff --git a/debian/copyright b/debian/copyright index 695d768bf..5d883b9de 100644 --- a/debian/copyright +++ b/debian/copyright @@ -104,9 +104,9 @@ Files: include/osmocom/sgsn/a_reset.h src/gprs/gprs_sndcp_vty.c src/gprs/gprs_sndcp_xid.c src/gprs/gprs_subscriber.c - src/gprs/gtphub.c - src/gprs/gtphub_main.c - src/gprs/gtphub_vty.c + src/gtphub/gtphub.c + src/gtphub/gtphub_main.c + src/gtphub/gtphub_vty.c src/gprs/sgsn_auth.c src/gprs/sgsn_cdr.c src/gprs/sgsn_ctrl.c @@ -140,8 +140,8 @@ License: AGPL-3.0+ You should have received a copy of the GNU Affero General Public License along with this program. If not, see . -Files: src/gprs/gtphub_ares.c - src/gprs/gtphub_sock.c +Files: src/gtphub/gtphub_ares.c + src/gtphub/gtphub_sock.c tests/gbproxy/gbproxy_test.c Copyright: 2013 Jacob Erlbeck 2013 sysmocom s.f.m.c. GmbH diff --git a/doc/examples/osmo-gtphub/gtphub-example.txt b/doc/examples/osmo-gtphub/gtphub-example.txt index 9c65f925f..17f6914d3 100644 --- a/doc/examples/osmo-gtphub/gtphub-example.txt +++ b/doc/examples/osmo-gtphub/gtphub-example.txt @@ -59,7 +59,7 @@ The LD_LIBRARY_PATH below may be needed if OpenGGSN installed to /usr/local. 2. GTPHub: cd - path/to/openbsc/openbsc/src/gprs/osmo-gtphub -c gtphub.conf #-e 1 #for DEBUG level + path/to/openbsc/openbsc/src/gtphub/osmo-gtphub -c gtphub.conf #-e 1 #for DEBUG level 3. SGSN tests: diff --git a/osmoappdesc.py b/osmoappdesc.py index 1c47aee66..9c3fd5d9d 100644 --- a/osmoappdesc.py +++ b/osmoappdesc.py @@ -25,7 +25,7 @@ app_configs = { apps = [(4246, "src/gbproxy/osmo-gbproxy", "OsmoGbProxy", "gbproxy"), (4245, "src/gprs/osmo-sgsn", "OsmoSGSN", "sgsn"), - (4253, "src/gprs/osmo-gtphub", "OsmoGTPhub", "gtphub") + (4253, "src/gtphub/osmo-gtphub", "OsmoGTPhub", "gtphub") ] vty_command = ["./src/gprs/osmo-sgsn", "-c", diff --git a/src/Makefile.am b/src/Makefile.am index 024938d81..2abd4375e 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -1,4 +1,5 @@ SUBDIRS = \ gprs \ gbproxy \ + gtphub \ $(NULL) diff --git a/src/gprs/Makefile.am b/src/gprs/Makefile.am index 8f7f054e7..e5d50d375 100644 --- a/src/gprs/Makefile.am +++ b/src/gprs/Makefile.am @@ -56,7 +56,6 @@ libcommon_la_LIBADD = \ bin_PROGRAMS = \ osmo-sgsn \ - osmo-gtphub \ $(NULL) osmo_sgsn_SOURCES = \ @@ -103,21 +102,3 @@ osmo_sgsn_LDADD += \ $(LIBASN1C_LIBS) \ $(NULL) endif - -osmo_gtphub_SOURCES = \ - gtphub_main.c \ - gtphub.c \ - gtphub_sock.c \ - gtphub_ares.c \ - gtphub_vty.c \ - $(NULL) -osmo_gtphub_LDADD = \ - libcommon.la \ - $(LIBOSMOCORE_LIBS) \ - $(LIBOSMOGSM_LIBS) \ - $(LIBOSMOVTY_LIBS) \ - $(LIBCARES_LIBS) \ - $(LIBGTP_LIBS) \ - $(LIBOSMOSIGTRAN_LIBS) \ - -lrt \ - $(NULL) diff --git a/src/gprs/gtphub.c b/src/gprs/gtphub.c deleted file mode 100644 index ca5857b39..000000000 --- a/src/gprs/gtphub.c +++ /dev/null @@ -1,2960 +0,0 @@ -/* GTP Hub Implementation */ - -/* (C) 2015 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * Author: Neels Hofmeyr - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see . - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include - -#include -#include -#include - -#include -#include -#include -#include -#include - -#include - - -static const int GTPH_GC_TICK_SECONDS = 1; - -void *osmo_gtphub_ctx; - -/* Convenience makro, note: only within this C file. */ -#define LOG(level, fmt, args...) \ - LOGP(DGTPHUB, level, fmt, ##args) - -#define ZERO_STRUCT(struct_pointer) memset(struct_pointer, '\0', \ - sizeof(*(struct_pointer))) - -/* TODO move this to osmocom/core/select.h ? */ -typedef int (*osmo_fd_cb_t)(struct osmo_fd *fd, unsigned int what); - -/* TODO move this to osmocom/core/linuxlist.h ? */ -#define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next) -#define llist_first(head, type, entry) \ - llist_entry(__llist_first(head), type, entry) - -#define __llist_last(head) (((head)->next == (head)) ? NULL : (head)->prev) -#define llist_last(head, type, entry) \ - llist_entry(__llist_last(head), type, entry) - -/* TODO move GTP header stuff to openggsn/gtp/ ? See gtp_decaps*() */ - -enum gtp_rc { - GTP_RC_UNKNOWN = 0, - GTP_RC_TINY = 1, /* no IEs (like ping/pong) */ - GTP_RC_PDU_C = 2, /* a real packet with IEs */ - GTP_RC_PDU_U = 3, /* a real packet with User data */ - - GTP_RC_TOOSHORT = -1, - GTP_RC_UNSUPPORTED_VERSION = -2, - GTP_RC_INVALID_IE = -3, -}; - -struct gtp_packet_desc { - union gtp_packet *data; - int data_len; - int header_len; - int version; - uint8_t type; - uint16_t seq; - uint32_t header_tei_rx; - uint32_t header_tei; - int rc; /* enum gtp_rc */ - unsigned int plane_idx; - unsigned int side_idx; - struct gtphub_tunnel *tun; - time_t timestamp; - union gtpie_member *ie[GTPIE_SIZE]; -}; - -struct pending_delete { - struct llist_head entry; - struct expiring_item expiry_entry; - - struct gtphub_tunnel *tun; - uint8_t teardown_ind; - uint8_t nsapi; -}; - - -/* counters */ - -enum gtphub_counters_io { - GTPH_CTR_PKTS_IN = 0, - GTPH_CTR_PKTS_OUT, - GTPH_CTR_BYTES_IN, - GTPH_CTR_BYTES_OUT -}; - -static const struct rate_ctr_desc gtphub_counters_io_desc[] = { - { "packets.in", "Packets ( In)" }, - { "packets.out", "Packets (Out)" }, - { "bytes.in", "Bytes ( In)" }, - { "bytes.out", "Bytes (Out)" }, -}; - -static const struct rate_ctr_group_desc gtphub_ctrg_io_desc = { - .group_name_prefix = "gtphub:bind", - .group_description = "I/O Statistics", - .num_ctr = ARRAY_SIZE(gtphub_counters_io_desc), - .ctr_desc = gtphub_counters_io_desc, - .class_id = OSMO_STATS_CLASS_GLOBAL, -}; - - -/* support */ - -static const char *gtp_type_str(uint8_t type) -{ - switch (type) { - case 1: - return " (Echo Request)"; - case 2: - return " (Echo Response)"; - case 16: - return " (Create PDP Ctx Request)"; - case 17: - return " (Create PDP Ctx Response)"; - case 18: - return " (Update PDP Ctx Request)"; - case 19: - return " (Update PDP Ctx Response)"; - case 20: - return " (Delete PDP Ctx Request)"; - case 21: - return " (Delete PDP Ctx Response)"; - case 255: - return " (User Data)"; - default: - return ""; - } -} - -void gsn_addr_copy(struct gsn_addr *gsna, const struct gsn_addr *src) -{ - *gsna = *src; -} - -int gsn_addr_from_sockaddr(struct gsn_addr *gsna, uint16_t *port, - const struct osmo_sockaddr *sa) -{ - char addr_str[256]; - char port_str[6]; - - if (osmo_sockaddr_to_strs(addr_str, sizeof(addr_str), - port_str, sizeof(port_str), - sa, (NI_NUMERICHOST | NI_NUMERICSERV)) - != 0) { - return -1; - } - - if (port) - *port = atoi(port_str); - - return gsn_addr_from_str(gsna, addr_str); -} - -int gsn_addr_from_str(struct gsn_addr *gsna, const char *numeric_addr_str) -{ - if ((!gsna) || (!numeric_addr_str)) - return -1; - - int af = AF_INET; - gsna->len = 4; - const char *pos = numeric_addr_str; - for (; *pos; pos++) { - if (*pos == ':') { - af = AF_INET6; - gsna->len = 16; - break; - } - } - - int rc = inet_pton(af, numeric_addr_str, gsna->buf); - if (rc != 1) { - LOG(LOGL_ERROR, "Cannot resolve numeric address: '%s'\n", - numeric_addr_str); - return -1; - } - return 0; -} - -const char *gsn_addr_to_str(const struct gsn_addr *gsna) -{ - static char buf[INET6_ADDRSTRLEN + 1]; - return gsn_addr_to_strb(gsna, buf, sizeof(buf)); -} - -const char *gsn_addr_to_strb(const struct gsn_addr *gsna, - char *strbuf, - int strbuf_len) -{ - int af; - switch (gsna->len) { - case 4: - af = AF_INET; - break; - case 16: - af = AF_INET6; - break; - default: - return NULL; - } - - const char *r = inet_ntop(af, gsna->buf, strbuf, strbuf_len); - if (!r) { - LOG(LOGL_ERROR, "Cannot convert gsn_addr to string:" - " %s: len=%d, buf=%s\n", - strerror(errno), - (int)gsna->len, - osmo_hexdump(gsna->buf, sizeof(gsna->buf))); - } - return r; -} - -int gsn_addr_same(const struct gsn_addr *a, const struct gsn_addr *b) -{ - if (a == b) - return 1; - if ((!a) || (!b)) - return 0; - if (a->len != b->len) - return 0; - return (memcmp(a->buf, b->buf, a->len) == 0)? 1 : 0; -} - -static int gsn_addr_get(struct gsn_addr *gsna, const struct gtp_packet_desc *p, - int idx) -{ - if (p->rc != GTP_RC_PDU_C) - return -1; - - unsigned int len; - /* gtpie.h fails to declare gtpie_gettlv()'s first arg as const. */ - if (gtpie_gettlv((union gtpie_member**)p->ie, GTPIE_GSN_ADDR, idx, - &len, gsna->buf, sizeof(gsna->buf)) - != 0) - return -1; - gsna->len = len; - return 0; -} - -static int gsn_addr_put(const struct gsn_addr *gsna, struct gtp_packet_desc *p, - int idx) -{ - if (p->rc != GTP_RC_PDU_C) - return -1; - - int ie_idx; - ie_idx = gtpie_getie(p->ie, GTPIE_GSN_ADDR, idx); - - if (ie_idx < 0) - return -1; - - struct gtpie_tlv *ie = &p->ie[ie_idx]->tlv; - int ie_l = ntoh16(ie->l); - if (ie_l != gsna->len) { - LOG(LOGL_ERROR, "Not implemented:" - " replace an IE address of different size:" - " replace %d with %d\n", (int)ie_l, (int)gsna->len); - return -1; - } - - memcpy(ie->v, gsna->buf, (int)ie_l); - return 0; -} - -/* Validate GTP version 0 data; analogous to validate_gtp1_header(), see there. - */ -void validate_gtp0_header(struct gtp_packet_desc *p) -{ - const struct gtp0_header *pheader = &(p->data->gtp0.h); - p->rc = GTP_RC_UNKNOWN; - p->header_len = 0; - - OSMO_ASSERT(p->data_len >= 1); - OSMO_ASSERT(p->version == 0); - - if (p->data_len < GTP0_HEADER_SIZE) { - LOG(LOGL_ERROR, "GTP0 packet too short: %d\n", p->data_len); - p->rc = GTP_RC_TOOSHORT; - return; - } - - p->type = ntoh8(pheader->type); - p->seq = ntoh16(pheader->seq); - p->header_tei_rx = 0; /* TODO */ - p->header_tei = p->header_tei_rx; - - if (p->data_len == GTP0_HEADER_SIZE) { - p->rc = GTP_RC_TINY; - p->header_len = GTP0_HEADER_SIZE; - return; - } - - /* Check packet length field versus length of packet */ - if (p->data_len != (ntoh16(pheader->length) + GTP0_HEADER_SIZE)) { - LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" - " match actual length (%d)\n", - GTP0_HEADER_SIZE, (int)ntoh16(pheader->length), - p->data_len); - p->rc = GTP_RC_TOOSHORT; - return; - } - - LOG(LOGL_DEBUG, "GTP v0 TID = %" PRIu64 "\n", pheader->tid); - p->header_len = GTP0_HEADER_SIZE; - p->rc = GTP_RC_PDU_C; -} - -/* Validate GTP version 1 data, and update p->rc with the result, as well as - * p->header_len in case of a valid header. */ -void validate_gtp1_header(struct gtp_packet_desc *p) -{ - const struct gtp1_header_long *pheader = &(p->data->gtp1l.h); - p->rc = GTP_RC_UNKNOWN; - p->header_len = 0; - - OSMO_ASSERT(p->data_len >= 1); - OSMO_ASSERT(p->version == 1); - - if ((p->data_len < GTP1_HEADER_SIZE_LONG) - && (p->data_len != GTP1_HEADER_SIZE_SHORT)){ - LOG(LOGL_ERROR, "GTP packet too short: %d\n", p->data_len); - p->rc = GTP_RC_TOOSHORT; - return; - } - - p->type = ntoh8(pheader->type); - p->header_tei_rx = ntoh32(pheader->tei); - p->header_tei = p->header_tei_rx; - p->seq = ntoh16(pheader->seq); - - LOG(LOGL_DEBUG, "| GTPv1\n"); - LOG(LOGL_DEBUG, "| type = %" PRIu8 " 0x%02" PRIx8 "\n", p->type, p->type); - LOG(LOGL_DEBUG, "| length = %" PRIu16 " 0x%04" PRIx16 "\n", ntoh16(pheader->length), ntoh16(pheader->length)); - LOG(LOGL_DEBUG, "| TEI = %" PRIu32 " 0x%08" PRIx32 "\n", p->header_tei_rx, p->header_tei_rx); - LOG(LOGL_DEBUG, "| seq = %" PRIu16 " 0x%04" PRIx16 "\n", p->seq, p->seq); - LOG(LOGL_DEBUG, "| npdu = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->npdu, pheader->npdu); - LOG(LOGL_DEBUG, "| next = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->next, pheader->next); - - if (p->data_len <= GTP1_HEADER_SIZE_LONG) { - p->rc = GTP_RC_TINY; - p->header_len = GTP1_HEADER_SIZE_SHORT; - return; - } - - /* Check packet length field versus length of packet */ - int announced_len = ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT; - if (p->data_len != announced_len) { - LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" - " match actual length (%d)\n", - GTP1_HEADER_SIZE_SHORT, (int)ntoh16(pheader->length), - p->data_len); - p->rc = GTP_RC_TOOSHORT; - return; - } - - p->rc = GTP_RC_PDU_C; - p->header_len = GTP1_HEADER_SIZE_LONG; -} - -/* Examine whether p->data of size p->data_len has a valid GTP header. Set - * p->version, p->rc and p->header_len. On error, p->rc <= 0 (see enum - * gtp_rc). p->data must point at a buffer with p->data_len set. */ -void validate_gtp_header(struct gtp_packet_desc *p) -{ - p->rc = GTP_RC_UNKNOWN; - - /* Need at least 1 byte in order to check version */ - if (p->data_len < 1) { - LOG(LOGL_ERROR, "Discarding packet - too small: %d\n", - p->data_len); - p->rc = GTP_RC_TOOSHORT; - return; - } - - p->version = p->data->flags >> 5; - - switch (p->version) { - case 0: - validate_gtp0_header(p); - break; - case 1: - validate_gtp1_header(p); - break; - default: - LOG(LOGL_ERROR, "Unsupported GTP version: %d\n", p->version); - p->rc = GTP_RC_UNSUPPORTED_VERSION; - break; - } -} - - -/* Return the value of the i'th IMSI IEI by copying to *imsi. - * The first IEI is reached by passing i = 0. - * imsi must point at allocated space of (at least) 8 bytes. - * Return 1 on success, or 0 if not found. */ -static int get_ie_imsi(union gtpie_member *ie[], int i, uint8_t *imsi) -{ - return gtpie_gettv0(ie, GTPIE_IMSI, i, imsi, 8) == 0; -} - -/* Analogous to get_ie_imsi(). nsapi must point at a single uint8_t. */ -static int get_ie_nsapi(union gtpie_member *ie[], int i, uint8_t *nsapi) -{ - return gtpie_gettv1(ie, GTPIE_NSAPI, i, nsapi) == 0; -} - -static char imsi_digit_to_char(uint8_t nibble) -{ - nibble &= 0x0f; - if (nibble > 9) - return (nibble == 0x0f) ? '\0' : '?'; - return '0' + nibble; -} - -/* Return a human readable IMSI string, in a static buffer. - * imsi must point at 8 octets of IMSI IE encoded IMSI data. */ -static int imsi_to_str(uint8_t *imsi, const char **imsi_str) -{ - static char str[17]; - int i; - - for (i = 0; i < 8; i++) { - char c; - c = imsi_digit_to_char(imsi[i]); - if (c == '?') - return -1; - str[2*i] = c; - - c = imsi_digit_to_char(imsi[i] >> 4); - if (c == '?') - return -1; - str[2*i + 1] = c; - } - str[16] = '\0'; - *imsi_str = str; - return 1; -} - -/* Return 0 if not present, 1 if present and decoded successfully, -1 if - * present but cannot be decoded. */ -static int get_ie_imsi_str(union gtpie_member *ie[], int i, - const char **imsi_str) -{ - uint8_t imsi_buf[8]; - if (!get_ie_imsi(ie, i, imsi_buf)) - return 0; - return imsi_to_str(imsi_buf, imsi_str); -} - -/* Return 0 if not present, 1 if present and decoded successfully, -1 if - * present but cannot be decoded. */ -static int get_ie_apn_str(union gtpie_member *ie[], const char **apn_str) -{ - static char apn_buf[GSM_APN_LENGTH]; - unsigned int len; - if (gtpie_gettlv(ie, GTPIE_APN, 0, - &len, apn_buf, sizeof(apn_buf)) != 0) - return 0; - - if (len < 2) { - LOG(LOGL_ERROR, "APN IE: invalid length: %d\n", - (int)len); - return -1; - } - - if (len > (sizeof(apn_buf) - 1)) - len = sizeof(apn_buf) - 1; - apn_buf[len] = '\0'; - - *apn_str = osmo_apn_to_str(apn_buf, (uint8_t*)apn_buf, len); - if (!(*apn_str)) { - LOG(LOGL_ERROR, "APN IE: present but cannot be decoded: %s\n", - osmo_hexdump((uint8_t*)apn_buf, len)); - return -1; - } - return 1; -} - - -/* Validate header, and index information elements. Write decoded packet - * information to *res. res->data will point at the given data buffer. On - * error, p->rc is set <= 0 (see enum gtp_rc). */ -static void gtp_decode(const uint8_t *data, int data_len, - unsigned int from_side_idx, - unsigned int from_plane_idx, - struct gtp_packet_desc *res, - time_t now) -{ - ZERO_STRUCT(res); - res->data = (union gtp_packet*)data; - res->data_len = data_len; - res->side_idx = from_side_idx; - res->plane_idx = from_plane_idx; - res->timestamp = now; - - validate_gtp_header(res); - - if (res->rc <= 0) - return; - - LOG(LOGL_DEBUG, "Valid GTP header (v%d)\n", res->version); - - if (from_plane_idx == GTPH_PLANE_USER) { - res->rc = GTP_RC_PDU_U; - return; - } - - if (res->rc != GTP_RC_PDU_C) { - LOG(LOGL_DEBUG, "no IEs in this GTP packet\n"); - return; - } - - if (gtpie_decaps(res->ie, res->version, - (void*)(data + res->header_len), - res->data_len - res->header_len) != 0) { - res->rc = GTP_RC_INVALID_IE; - LOG(LOGL_ERROR, "INVALID: cannot decode IEs." - " Dropping GTP packet%s.\n", - gtp_type_str(res->type) - ); - return; - } - -#if 1 - /* TODO if () - (waiting for a commit from jerlbeck) */ - int i; - - for (i = 0; i < 10; i++) { - const char *imsi; - if (get_ie_imsi_str(res->ie, i, &imsi) < 1) - break; - LOG(LOGL_DEBUG, "| IMSI %s\n", imsi); - } - - for (i = 0; i < 10; i++) { - uint8_t nsapi; - if (!get_ie_nsapi(res->ie, i, &nsapi)) - break; - LOG(LOGL_DEBUG, "| NSAPI %d\n", (int)nsapi); - } - - for (i = 0; i < 2; i++) { - struct gsn_addr addr; - if (gsn_addr_get(&addr, res, i) == 0) - LOG(LOGL_DEBUG, "| addr %s\n", gsn_addr_to_str(&addr)); - } - - for (i = 0; i < 10; i++) { - uint32_t tei; - if (gtpie_gettv4(res->ie, GTPIE_TEI_DI, i, &tei) != 0) - break; - LOG(LOGL_DEBUG, "| TEI DI (USER) %" PRIu32 " 0x%08" PRIx32 "\n", - tei, tei); - } - - for (i = 0; i < 10; i++) { - uint32_t tei; - if (gtpie_gettv4(res->ie, GTPIE_TEI_C, i, &tei) != 0) - break; - LOG(LOGL_DEBUG, "| TEI (CTRL) %" PRIu32 " 0x%08" PRIx32 "\n", - tei, tei); - } -#endif -} - - -/* expiry */ - -void expiry_init(struct expiry *exq, int expiry_in_seconds) -{ - ZERO_STRUCT(exq); - exq->expiry_in_seconds = expiry_in_seconds; - INIT_LLIST_HEAD(&exq->items); -} - -void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now) -{ - item->expiry = now + exq->expiry_in_seconds; - - OSMO_ASSERT(llist_empty(&exq->items) - || (item->expiry - >= llist_last(&exq->items, struct expiring_item, entry)->expiry)); - - /* Add/move to the tail to always sort by expiry, ascending. */ - llist_del(&item->entry); - llist_add_tail(&item->entry, &exq->items); -} - -int expiry_tick(struct expiry *exq, time_t now) -{ - int expired = 0; - struct expiring_item *m, *n; - llist_for_each_entry_safe(m, n, &exq->items, entry) { - if (m->expiry <= now) { - expiring_item_del(m); - expired ++; - } else { - /* The items are added sorted by expiry. So when we hit - * an unexpired entry, only more unexpired ones will - * follow. */ - break; - } - } - return expired; -} - -void expiry_clear(struct expiry *exq) -{ - struct expiring_item *m, *n; - llist_for_each_entry_safe(m, n, &exq->items, entry) { - expiring_item_del(m); - } -} - -void expiring_item_init(struct expiring_item *item) -{ - ZERO_STRUCT(item); - INIT_LLIST_HEAD(&item->entry); -} - -void expiring_item_del(struct expiring_item *item) -{ - OSMO_ASSERT(item); - llist_del(&item->entry); - INIT_LLIST_HEAD(&item->entry); - if (item->del_cb) { - /* avoid loops */ - del_cb_t del_cb = item->del_cb; - item->del_cb = 0; - (del_cb)(item); - } -} - - -/* nr_map, nr_pool */ - -void nr_pool_init(struct nr_pool *pool, nr_t nr_min, nr_t nr_max) -{ - *pool = (struct nr_pool){ - .nr_min = nr_min, - .nr_max = nr_max, - .last_nr = nr_max - }; -} - -nr_t nr_pool_next(struct nr_pool *pool) -{ - if (pool->last_nr >= pool->nr_max) - pool->last_nr = pool->nr_min; - else - pool->last_nr ++; - - return pool->last_nr; -} - -void nr_map_init(struct nr_map *map, struct nr_pool *pool, - struct expiry *exq) -{ - ZERO_STRUCT(map); - map->pool = pool; - map->add_items_to_expiry = exq; - INIT_LLIST_HEAD(&map->mappings); -} - -void nr_mapping_init(struct nr_mapping *m) -{ - ZERO_STRUCT(m); - INIT_LLIST_HEAD(&m->entry); - expiring_item_init(&m->expiry_entry); -} - -void nr_map_add(struct nr_map *map, struct nr_mapping *mapping, time_t now) -{ - /* Generate a mapped number */ - mapping->repl = nr_pool_next(map->pool); - - /* Add to the tail to always yield a list sorted by expiry, in - * ascending order. */ - llist_add_tail(&mapping->entry, &map->mappings); - nr_map_refresh(map, mapping, now); -} - -void nr_map_refresh(struct nr_map *map, struct nr_mapping *mapping, time_t now) -{ - if (!map->add_items_to_expiry) - return; - expiry_add(map->add_items_to_expiry, - &mapping->expiry_entry, - now); -} - -void nr_map_clear(struct nr_map *map) -{ - struct nr_mapping *m; - struct nr_mapping *n; - llist_for_each_entry_safe(m, n, &map->mappings, entry) { - nr_mapping_del(m); - } -} - -int nr_map_empty(const struct nr_map *map) -{ - return llist_empty(&map->mappings); -} - -struct nr_mapping *nr_map_get(const struct nr_map *map, - void *origin, nr_t nr_orig) -{ - struct nr_mapping *mapping; - llist_for_each_entry(mapping, &map->mappings, entry) { - if ((mapping->origin == origin) - && (mapping->orig == nr_orig)) - return mapping; - } - /* Not found. */ - return NULL; -} - -struct nr_mapping *nr_map_get_inv(const struct nr_map *map, nr_t nr_repl) -{ - struct nr_mapping *mapping; - llist_for_each_entry(mapping, &map->mappings, entry) { - if (mapping->repl == nr_repl) { - return mapping; - } - } - /* Not found. */ - return NULL; -} - -void nr_mapping_del(struct nr_mapping *mapping) -{ - OSMO_ASSERT(mapping); - llist_del(&mapping->entry); - INIT_LLIST_HEAD(&mapping->entry); - expiring_item_del(&mapping->expiry_entry); -} - - -/* gtphub */ - -const char* const gtphub_plane_idx_names[GTPH_PLANE_N] = { - "CTRL", - "USER", -}; - -const uint16_t gtphub_plane_idx_default_port[GTPH_PLANE_N] = { - 2123, - 2152, -}; - -const char* const gtphub_side_idx_names[GTPH_SIDE_N] = { - "SGSN", - "GGSN", -}; - -time_t gtphub_now(void) -{ - struct timespec now_tp; - OSMO_ASSERT(osmo_clock_gettime(CLOCK_MONOTONIC, &now_tp) >= 0); - return now_tp.tv_sec; -} - -/* Remove a gtphub_peer from its list and free it. */ -static void gtphub_peer_del(struct gtphub_peer *peer) -{ - OSMO_ASSERT(llist_empty(&peer->addresses)); - nr_map_clear(&peer->seq_map); - llist_del(&peer->entry); - talloc_free(peer); -} - -static void gtphub_peer_addr_del(struct gtphub_peer_addr *pa) -{ - OSMO_ASSERT(llist_empty(&pa->ports)); - llist_del(&pa->entry); - talloc_free(pa); -} - -static void gtphub_peer_port_del(struct gtphub_peer_port *pp) -{ - OSMO_ASSERT(pp->ref_count == 0); - llist_del(&pp->entry); - rate_ctr_group_free(pp->counters_io); - talloc_free(pp); -} - -/* From the information in the gtp_packet_desc, return the address of a GGSN. - * Return -1 on error. */ -static int gtphub_resolve_ggsn(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port **pp); - -/* See gtphub_ext.c (wrapped by unit test) */ -struct gtphub_peer_port *gtphub_resolve_ggsn_addr(struct gtphub *hub, - const char *imsi_str, - const char *apn_ni_str); -int gtphub_ares_init(struct gtphub *hub); - -static void gtphub_zero(struct gtphub *hub) -{ - ZERO_STRUCT(hub); - INIT_LLIST_HEAD(&hub->ggsn_lookups); - INIT_LLIST_HEAD(&hub->resolved_ggsns); -} - -static int gtphub_sock_init(struct osmo_fd *ofd, - const struct gtphub_cfg_addr *addr, - osmo_fd_cb_t cb, - void *data, - int ofd_id) -{ - if (!addr->addr_str) { - LOG(LOGL_FATAL, "Cannot bind: empty address.\n"); - return -1; - } - if (!addr->port) { - LOG(LOGL_FATAL, "Cannot bind: zero port not permitted.\n"); - return -1; - } - - ofd->when = BSC_FD_READ; - ofd->cb = cb; - ofd->data = data; - ofd->priv_nr = ofd_id; - - int rc; - rc = osmo_sock_init_ofd(ofd, - AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, - addr->addr_str, addr->port, - OSMO_SOCK_F_BIND); - if (rc < 1) { - LOG(LOGL_FATAL, "Cannot bind to %s port %d (rc %d)\n", - addr->addr_str, (int)addr->port, rc); - return -1; - } - - return 0; -} - -static void gtphub_sock_close(struct osmo_fd *ofd) -{ - close(ofd->fd); - osmo_fd_unregister(ofd); - ofd->cb = NULL; -} - -static void gtphub_bind_init(struct gtphub_bind *b, uint32_t idx) -{ - ZERO_STRUCT(b); - - INIT_LLIST_HEAD(&b->peers); - - b->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, - >phub_ctrg_io_desc, idx); - OSMO_ASSERT(b->counters_io); -} - -static int gtphub_bind_start(struct gtphub_bind *b, - const struct gtphub_cfg_bind *cfg, - osmo_fd_cb_t cb, void *cb_data, - unsigned int ofd_id) -{ - LOG(LOGL_DEBUG, "Starting bind %s\n", b->label); - if (gsn_addr_from_str(&b->local_addr, cfg->bind.addr_str) != 0) { - LOG(LOGL_FATAL, "Invalid bind address for %s: %s\n", - b->label, cfg->bind.addr_str); - return -1; - } - if (gtphub_sock_init(&b->ofd, &cfg->bind, cb, cb_data, ofd_id) != 0) { - LOG(LOGL_FATAL, "Cannot bind for %s: %s\n", - b->label, cfg->bind.addr_str); - return -1; - } - b->local_port = cfg->bind.port; - return 0; -} - -static void gtphub_bind_free(struct gtphub_bind *b) -{ - OSMO_ASSERT(llist_empty(&b->peers)); - if (b->counters_io) - rate_ctr_group_free(b->counters_io); -} - -static void gtphub_bind_stop(struct gtphub_bind *b) { - gtphub_sock_close(&b->ofd); - gtphub_bind_free(b); -} - -/* Recv datagram from from->fd, write sender's address to *from_addr. - * Return the number of bytes read, zero on error. */ -static int gtphub_read(const struct osmo_fd *from, - struct osmo_sockaddr *from_addr, - uint8_t *buf, size_t buf_len) -{ - OSMO_ASSERT(from_addr); - - /* recvfrom requires the available length set in *from_addr_len. */ - from_addr->l = sizeof(from_addr->a); - errno = 0; - ssize_t received = recvfrom(from->fd, buf, buf_len, 0, - (struct sockaddr*)&from_addr->a, - &from_addr->l); - /* TODO use recvmsg and get a MSG_TRUNC flag to make sure the message - * is not truncated. Then maybe reduce buf's size. */ - - if (received <= 0) { - LOG((errno == EAGAIN? LOGL_DEBUG : LOGL_ERROR), - "error: %s\n", strerror(errno)); - return 0; - } - - LOG(LOGL_DEBUG, "Received %d bytes from %s: %s%s\n", - (int)received, osmo_sockaddr_to_str(from_addr), - osmo_hexdump(buf, received > 1000? 1000 : received), - received > 1000 ? "..." : ""); - - return received; -} - -static inline void gtphub_port_ref_count_inc(struct gtphub_peer_port *pp) -{ - OSMO_ASSERT(pp); - OSMO_ASSERT(pp->ref_count < UINT_MAX); - pp->ref_count++; -} - -static inline void gtphub_port_ref_count_dec(struct gtphub_peer_port *pp) -{ - OSMO_ASSERT(pp); - OSMO_ASSERT(pp->ref_count > 0); - pp->ref_count--; -} - -static inline void set_seq(struct gtp_packet_desc *p, uint16_t seq) -{ - OSMO_ASSERT(p->version == 1); - p->data->gtp1l.h.seq = hton16(seq); - p->seq = seq; -} - -static inline void set_tei(struct gtp_packet_desc *p, uint32_t tei) -{ - OSMO_ASSERT(p->version == 1); - p->data->gtp1l.h.tei = hton32(tei); - p->header_tei = tei; -} - -static void gtphub_mapping_del_cb(struct expiring_item *expi); - -static struct nr_mapping *gtphub_mapping_new() -{ - struct nr_mapping *nrm; - nrm = talloc_zero(osmo_gtphub_ctx, struct nr_mapping); - OSMO_ASSERT(nrm); - - nr_mapping_init(nrm); - nrm->expiry_entry.del_cb = gtphub_mapping_del_cb; - return nrm; -} - - -#define APPEND(args...) \ - l = snprintf(pos, left, args); \ - pos += l; \ - left -= l - -static const char *gtphub_tunnel_side_str(struct gtphub_tunnel *tun, - int side_idx) -{ - static char buf[256]; - char *pos = buf; - int left = sizeof(buf); - int l; - - struct gtphub_tunnel_endpoint *c, *u; - c = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; - u = &tun->endpoint[side_idx][GTPH_PLANE_USER]; - - /* print both only if they differ. */ - if (!c->peer) { - APPEND("(uninitialized)"); - } else { - APPEND("%s", gsn_addr_to_str(&c->peer->peer_addr->addr)); - } - - if (!u->peer) { - if (c->peer) { - APPEND("/(uninitialized)"); - } - } else if ((!c->peer) - || (!gsn_addr_same(&u->peer->peer_addr->addr, - &c->peer->peer_addr->addr))) { - APPEND("/%s", gsn_addr_to_str(&u->peer->peer_addr->addr)); - } - - APPEND(" (TEI C=%x U=%x)", - c->tei_orig, - u->tei_orig); - return buf; -} - -const char *gtphub_tunnel_str(struct gtphub_tunnel *tun) -{ - static char buf[512]; - char *pos = buf; - int left = sizeof(buf); - int l; - - if (!tun) - return "null-tunnel"; - - APPEND("TEI=%x: ", tun->tei_repl); - APPEND("%s", gtphub_tunnel_side_str(tun, GTPH_SIDE_SGSN)); - APPEND(" <-> %s", gtphub_tunnel_side_str(tun, GTPH_SIDE_GGSN)); - - return buf; -} - -#undef APPEND - -void gtphub_tunnel_endpoint_set_peer(struct gtphub_tunnel_endpoint *te, - struct gtphub_peer_port *pp) -{ - if (te->peer) - gtphub_port_ref_count_dec(te->peer); - te->peer = pp; - if (te->peer) - gtphub_port_ref_count_inc(te->peer); -} - -int gtphub_tunnel_complete(struct gtphub_tunnel *tun) -{ - if (!tun) - return 0; - if (!tun->tei_repl) - return 0; - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - struct gtphub_tunnel_endpoint *te = - &tun->endpoint[side_idx][plane_idx]; - if (!(te->peer && te->tei_orig)) - return 0; - } - return 1; -} - -static void gtphub_tunnel_del_cb(struct expiring_item *expi) -{ - struct gtphub_tunnel *tun = container_of(expi, - struct gtphub_tunnel, - expiry_entry); - LOG(LOGL_DEBUG, "expired: %s\n", gtphub_tunnel_str(tun)); - - llist_del(&tun->entry); - INIT_LLIST_HEAD(&tun->entry); /* mark unused */ - - expi->del_cb = 0; /* avoid recursion loops */ - expiring_item_del(&tun->expiry_entry); /* usually already done, but make sure. */ - - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; - - /* clear ref count */ - gtphub_tunnel_endpoint_set_peer(te, NULL); - - rate_ctr_group_free(te->counters_io); - } - - talloc_free(tun); -} - -#define CTR_IDX(s, p, a, b) (a + s + (p + b) * 2) - -/* rate counter index for tunnels: [3; 6] */ -#define CTR_IDX_TUN(s, p) CTR_IDX(s, p, 1, 1) - -/* rate counter index for hubs: [7; 10] */ -#define CTR_IDX_HUB(s, p) CTR_IDX(s, p, 3, 2) - -static struct gtphub_tunnel *gtphub_tunnel_new() -{ - struct gtphub_tunnel *tun; - tun = talloc_zero(osmo_gtphub_ctx, struct gtphub_tunnel); - OSMO_ASSERT(tun); - - INIT_LLIST_HEAD(&tun->entry); - expiring_item_init(&tun->expiry_entry); - - int side_idx, plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; - te->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, - >phub_ctrg_io_desc, - CTR_IDX_TUN(side_idx, plane_idx)); - if (!te->counters_io) - return NULL; - } - - tun->expiry_entry.del_cb = gtphub_tunnel_del_cb; - return tun; -} - -static const char *gtphub_peer_strb(struct gtphub_peer *peer, char *buf, - int buflen) -{ - if (llist_empty(&peer->addresses)) - return "(addressless)"; - - struct gtphub_peer_addr *a = llist_first(&peer->addresses, - struct gtphub_peer_addr, - entry); - return gsn_addr_to_strb(&a->addr, buf, buflen); -} - -static const char *gtphub_port_strb(struct gtphub_peer_port *port, char *buf, - int buflen) -{ - if (!port) - return "(null port)"; - - snprintf(buf, buflen, "%s port %d", - gsn_addr_to_str(&port->peer_addr->addr), - (int)port->port); - return buf; -} - -const char *gtphub_peer_str(struct gtphub_peer *peer) -{ - static char buf[256]; - return gtphub_peer_strb(peer, buf, sizeof(buf)); -} - -const char *gtphub_port_str(struct gtphub_peer_port *port) -{ - static char buf[256]; - return gtphub_port_strb(port, buf, sizeof(buf)); -} - -static const char *gtphub_port_str2(struct gtphub_peer_port *port) -{ - static char buf[256]; - return gtphub_port_strb(port, buf, sizeof(buf)); -} - -static void gtphub_mapping_del_cb(struct expiring_item *expi) -{ - expi->del_cb = 0; /* avoid recursion loops */ - expiring_item_del(expi); /* usually already done, but make sure. */ - - struct nr_mapping *nrm = container_of(expi, - struct nr_mapping, - expiry_entry); - llist_del(&nrm->entry); - INIT_LLIST_HEAD(&nrm->entry); /* mark unused */ - - /* Just for log */ - struct gtphub_peer_port *from = nrm->origin; - OSMO_ASSERT(from); - LOG(LOGL_DEBUG, "expired: %d: nr mapping from %s: %u->%u\n", - (int)nrm->expiry_entry.expiry, - gtphub_port_str(from), - (unsigned int)nrm->orig, (unsigned int)nrm->repl); - - gtphub_port_ref_count_dec(from); - - talloc_free(nrm); -} - -static struct nr_mapping *gtphub_mapping_have(struct nr_map *map, - struct gtphub_peer_port *from, - nr_t orig_nr, - time_t now) -{ - struct nr_mapping *nrm; - - nrm = nr_map_get(map, from, orig_nr); - - if (!nrm) { - nrm = gtphub_mapping_new(); - nrm->orig = orig_nr; - nrm->origin = from; - nr_map_add(map, nrm, now); - gtphub_port_ref_count_inc(from); - LOG(LOGL_DEBUG, "peer %s: sequence map %d --> %d\n", - gtphub_port_str(from), - (int)(nrm->orig), (int)(nrm->repl)); - } else { - nr_map_refresh(map, nrm, now); - } - - OSMO_ASSERT(nrm); - return nrm; -} - -static void gtphub_map_seq(struct gtp_packet_desc *p, - struct gtphub_peer_port *from_port, - struct gtphub_peer_port *to_port) -{ - /* Store a mapping in to_peer's map, so when we later receive a GTP - * packet back from to_peer, the seq nr can be unmapped back to its - * origin (from_peer here). */ - struct nr_mapping *nrm; - nrm = gtphub_mapping_have(&to_port->peer_addr->peer->seq_map, - from_port, p->seq, p->timestamp); - - /* Change the GTP packet to yield the new, mapped seq nr */ - set_seq(p, nrm->repl); -} - -static struct gtphub_peer_port *gtphub_unmap_seq(struct gtp_packet_desc *p, - struct gtphub_peer_port *responding_port) -{ - OSMO_ASSERT(p->version == 1); - struct nr_mapping *nrm = - nr_map_get_inv(&responding_port->peer_addr->peer->seq_map, - p->seq); - if (!nrm) - return NULL; - LOG(LOGL_DEBUG, "peer %p: sequence unmap %d <-- %d\n", - nrm->origin, (int)(nrm->orig), (int)(nrm->repl)); - set_seq(p, nrm->orig); - return nrm->origin; -} - -static int gtphub_check_mapped_tei(struct gtphub_tunnel *new_tun, - struct gtphub_tunnel *iterated_tun, - uint32_t *tei_min, - uint32_t *tei_max) -{ - if (!new_tun->tei_repl || !iterated_tun->tei_repl) - return 1; - - *tei_min = (*tei_min < iterated_tun->tei_repl)? *tei_min : iterated_tun->tei_repl; - *tei_max = (*tei_max > iterated_tun->tei_repl)? *tei_max : iterated_tun->tei_repl; - - if (new_tun->tei_repl != iterated_tun->tei_repl) - return 1; - - /* new_tun->tei_repl is already taken. Try to find one out of the known - * range. */ - LOG(LOGL_DEBUG, "TEI replacement %d already taken.\n", new_tun->tei_repl); - - if ((*tei_max) < 0xffffffff) { - (*tei_max)++; - new_tun->tei_repl = *tei_max; - LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); - return 1; - } else if ((*tei_min) > 1) { - (*tei_min)--; - new_tun->tei_repl = *tei_min; - LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); - return 1; - } - - /* None seems to be available. */ - return 0; -} - -static int gtphub_check_reused_teis(struct gtphub *hub, - struct gtphub_tunnel *new_tun) -{ - uint32_t tei_min = 0xffffffff; - uint32_t tei_max = 0; - int side_idx; - int plane_idx; - struct gtphub_tunnel_endpoint *te; - struct gtphub_tunnel_endpoint *te2; - - struct gtphub_tunnel *tun, *ntun; - - llist_for_each_entry_safe(tun, ntun, &hub->tunnels, entry) { - if (tun == new_tun) - continue; - - /* Check whether the GSN sent a TEI that it is reusing from a - * previous tunnel. */ - int tun_continue = 0; - for_each_side(side_idx) { - for_each_plane(plane_idx) { - te = &tun->endpoint[side_idx][plane_idx]; - te2 = &new_tun->endpoint[side_idx][plane_idx]; - if ((te->tei_orig == 0) - || (te->tei_orig != te2->tei_orig) - || (!te->peer) - || (!te2->peer) - || !gsn_addr_same(&te->peer->peer_addr->addr, - &te2->peer->peer_addr->addr)) - continue; - - /* The peer is reusing a TEI that I believe to - * be part of another tunnel. The other tunnel - * must be stale, then. */ - LOG(LOGL_NOTICE, - "Expiring tunnel due to reused TEI:" - " %s peer %s sent %s TEI %x," - " previously used by tunnel %s...\n", - gtphub_side_idx_names[side_idx], - gtphub_port_str(te->peer), - gtphub_plane_idx_names[plane_idx], - te->tei_orig, - gtphub_tunnel_str(tun)); - LOG(LOGL_NOTICE, "...while establishing tunnel %s\n", - gtphub_tunnel_str(new_tun)); - - expiring_item_del(&tun->expiry_entry); - /* continue to find more matches. There shouldn't be - * any, but let's make sure. However, tun is deleted, - * so we need to skip to the next tunnel. */ - tun_continue = 1; - break; - } - if (tun_continue) - break; - } - if (tun_continue) - continue; - - /* Check whether the mapped TEI is already used by another - * tunnel. */ - if (!gtphub_check_mapped_tei(new_tun, tun, &tei_min, &tei_max)) { - LOG(LOGL_ERROR, - "No mapped TEI is readily available." - " Searching for holes between occupied" - " TEIs not implemented."); - return 0; - } - - } - - return 1; -} - -static void gtphub_tunnel_refresh(struct gtphub *hub, - struct gtphub_tunnel *tun, - time_t now) -{ - expiry_add(&hub->expire_slowly, - &tun->expiry_entry, - now); -} - -static struct gtphub_tunnel_endpoint *gtphub_unmap_tei(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from, - struct gtphub_tunnel **unmapped_from_tun) -{ - OSMO_ASSERT(from); - int other_side = other_side_idx(p->side_idx); - - struct gtphub_tunnel *tun; - llist_for_each_entry(tun, &hub->tunnels, entry) { - struct gtphub_tunnel_endpoint *te_from = - &tun->endpoint[p->side_idx][p->plane_idx]; - struct gtphub_tunnel_endpoint *te_to = - &tun->endpoint[other_side][p->plane_idx]; - if ((tun->tei_repl == p->header_tei_rx) - && te_from->peer - && gsn_addr_same(&te_from->peer->peer_addr->addr, - &from->peer_addr->addr)) { - gtphub_tunnel_refresh(hub, tun, p->timestamp); - if (unmapped_from_tun) - *unmapped_from_tun = tun; - return te_to; - } - } - - if (unmapped_from_tun) - *unmapped_from_tun = NULL; - return NULL; -} - -static void gtphub_map_restart_counter(struct gtphub *hub, - struct gtp_packet_desc *p) -{ - if (p->rc != GTP_RC_PDU_C) - return; - - int ie_idx; - ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); - if (ie_idx < 0) - return; - - /* Always send gtphub's own restart counter */ - p->ie[ie_idx]->tv1.v = hton8(hub->restart_counter); -} - -static int gtphub_unmap_header_tei(struct gtphub_peer_port **to_port_p, - struct gtphub_tunnel **unmapped_from_tun, - struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from_port) -{ - OSMO_ASSERT(p->version == 1); - *to_port_p = NULL; - if (unmapped_from_tun) - *unmapped_from_tun = NULL; - - /* If the header's TEI is zero, no PDP context has been established - * yet. If nonzero, a mapping should actually already exist for this - * TEI, since it must have been announced in a PDP context creation. */ - if (!p->header_tei_rx) - return 0; - - /* to_peer has previously announced a TEI, which was stored and - * mapped in a tunnel struct. */ - struct gtphub_tunnel_endpoint *to; - to = gtphub_unmap_tei(hub, p, from_port, unmapped_from_tun); - if (!to) { - LOG(LOGL_ERROR, "Received unknown TEI %" PRIx32 " from %s\n", - p->header_tei_rx, gtphub_port_str(from_port)); - return -1; - } - - if (unmapped_from_tun) { - OSMO_ASSERT(*unmapped_from_tun); - LOG(LOGL_DEBUG, "Unmapped TEI coming from: %s\n", - gtphub_tunnel_str(*unmapped_from_tun)); - } - - uint32_t unmapped_tei = to->tei_orig; - set_tei(p, unmapped_tei); - - /* May be NULL for an invalidated tunnel. */ - *to_port_p = to->peer; - - return 0; -} - -static int gtphub_handle_create_pdp_ctx(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from_ctrl, - struct gtphub_peer_port *to_ctrl) -{ - int plane_idx; - - osmo_static_assert((GTPH_PLANE_CTRL == 0) && (GTPH_PLANE_USER == 1), - plane_nrs_match_GSN_addr_IE_indices); - - struct gtphub_tunnel *tun = p->tun; - - if (p->type == GTP_CREATE_PDP_REQ) { - if (p->side_idx != GTPH_SIDE_SGSN) { - LOG(LOGL_ERROR, "Wrong side: Create PDP Context" - " Request from the GGSN side: %s", - gtphub_port_str(from_ctrl)); - return -1; - } - - if (tun) { - LOG(LOGL_ERROR, "Not implemented: Received" - " Create PDP Context Request for an already" - " established tunnel:" - " from %s, tunnel %s\n", - gtphub_port_str(from_ctrl), - gtphub_tunnel_str(p->tun)); - return -1; - } - - /* A new tunnel. */ - tun = gtphub_tunnel_new(); - if (!tun) { - LOG(LOGL_ERROR, "Failed to allocate new tunnel %s <-> %s\n", - gtphub_port_str(from_ctrl), gtphub_port_str(to_ctrl)); - return -1; - } - p->tun = tun; - - /* Create TEI mapping */ - tun->tei_repl = nr_pool_next(&hub->tei_pool); - - llist_add(&tun->entry, &hub->tunnels); - gtphub_tunnel_refresh(hub, tun, p->timestamp); - /* The endpoint peers on this side (SGSN) will be set from IEs - * below. Also set the GGSN Ctrl endpoint, for logging. */ - gtphub_tunnel_endpoint_set_peer(&tun->endpoint[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], - to_ctrl); - } else if (p->type == GTP_CREATE_PDP_RSP) { - if (p->side_idx != GTPH_SIDE_GGSN) { - LOG(LOGL_ERROR, "Wrong side: Create PDP Context" - " Response from the SGSN side: %s", - gtphub_port_str(from_ctrl)); - return -1; - } - - /* The tunnel should already have been resolved from the header - * TEI and be available in tun (== p->tun). Just fill in the - * GSN Addresses below.*/ - OSMO_ASSERT(tun); - OSMO_ASSERT(tun->tei_repl == p->header_tei_rx); - OSMO_ASSERT(to_ctrl); - } - - uint8_t ie_type[] = { GTPIE_TEI_C, GTPIE_TEI_DI }; - int ie_mandatory = (p->type == GTP_CREATE_PDP_REQ); - unsigned int side_idx = p->side_idx; - - for_each_plane(plane_idx) { - int rc; - struct gsn_addr use_addr; - uint16_t use_port; - uint32_t tei_from_ie; - int ie_idx; - - /* Fetch GSN Address and TEI from IEs. As ensured by above - * static asserts, plane_idx corresponds to the GSN Address IE - * index (the first one = 0 = ctrl, second one = 1 = user). */ - rc = gsn_addr_get(&use_addr, p, plane_idx); - if (rc) { - LOG(LOGL_ERROR, "Cannot read %s GSN Address IE\n", - gtphub_plane_idx_names[plane_idx]); - return -1; - } - LOG(LOGL_DEBUG, "Read %s GSN addr %s (%d)\n", - gtphub_plane_idx_names[plane_idx], - gsn_addr_to_str(&use_addr), - use_addr.len); - - ie_idx = gtpie_getie(p->ie, ie_type[plane_idx], 0); - if (ie_idx < 0) { - if (ie_mandatory) { - LOG(LOGL_ERROR, - "Create PDP Context message invalid:" - " missing IE %d\n", - (int)ie_type[plane_idx]); - return -1; - } - tei_from_ie = 0; - } - else - tei_from_ie = ntoh32(p->ie[ie_idx]->tv4.v); - - /* Make sure an entry for this peer address with default port - * exists. - * - * Exception: if sgsn_use_sender is set, instead use the - * sender's address and port for Ctrl -- the User port is not - * known until the first User packet arrives. - * - * Note: doing this here is just an optimization, because - * gtphub_handle_buf() has code to replace the tunnel - * endpoints' addresses with the sender (needed for User - * plane). We could just ignore sgsn_use_sender here. But if we - * set up a default port here and replace it in - * gtphub_handle_buf(), we'd be creating a peer port just to - * expire it right away. */ - if (hub->sgsn_use_sender && (side_idx == GTPH_SIDE_SGSN)) { - int rc = gsn_addr_from_sockaddr(&use_addr, &use_port, &from_ctrl->sa); - if (rc < 0) - LOG(LOGL_ERROR, "%s(): failed to obtain GSN address\n", __func__); - } else { - use_port = gtphub_plane_idx_default_port[plane_idx]; - - } - - struct gtphub_peer_port *peer_from_ie; - peer_from_ie = gtphub_port_have(hub, - &hub->to_gsns[side_idx][plane_idx], - &use_addr, use_port); - - gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][plane_idx], - peer_from_ie); - - if (!tei_from_ie && - !tun->endpoint[side_idx][plane_idx].tei_orig) { - LOG(LOGL_ERROR, - "Create PDP Context message omits %s TEI, but" - " no TEI has been announced for this tunnel: %s\n", - gtphub_plane_idx_names[plane_idx], - gtphub_tunnel_str(tun)); - return -1; - } - - if (tei_from_ie) { - /* Replace TEI in GTP packet IE */ - tun->endpoint[side_idx][plane_idx].tei_orig = tei_from_ie; - p->ie[ie_idx]->tv4.v = hton32(tun->tei_repl); - - if (!gtphub_check_reused_teis(hub, tun)) { - /* It's highly unlikely that all TEIs are - * taken. But the code looking for an unused - * TEI is, at the time of writing this comment, - * not able to find gaps in the TEI space. To - * explicitly alert the user of this problem, - * rather abort than carry on. */ - LOG(LOGL_FATAL, "TEI range exhausted. Cannot create TEI mapping, aborting.\n"); - abort(); - } - } - - /* Replace the GSN address to reflect gtphub. */ - rc = gsn_addr_put(&hub->to_gsns[other_side_idx(side_idx)][plane_idx].local_addr, - p, plane_idx); - if (rc) { - LOG(LOGL_ERROR, "Cannot write %s GSN Address IE\n", - gtphub_plane_idx_names[plane_idx]); - return -1; - } - } - - if (p->type == GTP_CREATE_PDP_REQ) { - LOG(LOGL_DEBUG, "New tunnel, first half: %s\n", - gtphub_tunnel_str(tun)); - } else if (p->type == GTP_CREATE_PDP_RSP) { - LOG(LOGL_DEBUG, "New tunnel: %s\n", - gtphub_tunnel_str(tun)); - } - - return 0; -} - -static void pending_delete_del_cb(struct expiring_item *expi) -{ - struct pending_delete *pd; - pd = container_of(expi, struct pending_delete, expiry_entry); - - llist_del(&pd->entry); - INIT_LLIST_HEAD(&pd->entry); - - pd->expiry_entry.del_cb = 0; - expiring_item_del(&pd->expiry_entry); - - talloc_free(pd); -} - -static struct pending_delete *pending_delete_new(void) -{ - struct pending_delete *pd = talloc_zero(osmo_gtphub_ctx, struct pending_delete); - INIT_LLIST_HEAD(&pd->entry); - expiring_item_init(&pd->expiry_entry); - pd->expiry_entry.del_cb = pending_delete_del_cb; - return pd; -} - -static int gtphub_handle_delete_pdp_ctx(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from_ctrl, - struct gtphub_peer_port *to_ctrl) -{ - struct gtphub_tunnel *known_tun = p->tun; - - if (p->type == GTP_DELETE_PDP_REQ) { - if (!known_tun) { - LOG(LOGL_ERROR, "Cannot find tunnel for Delete PDP Context Request.\n"); - return -1; - } - - /* Store the Delete Request until a successful Response is seen. */ - uint8_t teardown_ind; - uint8_t nsapi; - - if (gtpie_gettv1(p->ie, GTPIE_TEARDOWN, 0, &teardown_ind) != 0) { - LOG(LOGL_ERROR, "Missing Teardown Ind IE in Delete PDP Context Request.\n"); - return -1; - } - - if (gtpie_gettv1(p->ie, GTPIE_NSAPI, 0, &nsapi) != 0) { - LOG(LOGL_ERROR, "Missing NSAPI IE in Delete PDP Context Request.\n"); - return -1; - } - - struct pending_delete *pd = NULL; - - struct pending_delete *pdi = NULL; - llist_for_each_entry(pdi, &hub->pending_deletes, entry) { - if ((pdi->tun == known_tun) - && (pdi->teardown_ind == teardown_ind) - && (pdi->nsapi == nsapi)) { - pd = pdi; - break; - } - } - - if (!pd) { - pd = pending_delete_new(); - pd->tun = known_tun; - pd->teardown_ind = teardown_ind; - pd->nsapi = nsapi; - - LOG(LOGL_DEBUG, "Tunnel delete pending: %s\n", - gtphub_tunnel_str(known_tun)); - llist_add(&pd->entry, &hub->pending_deletes); - } - - /* Add or refresh timeout. */ - expiry_add(&hub->expire_quickly, &pd->expiry_entry, p->timestamp); - - /* If a pending_delete should expire before the response to - * indicate success comes in, the responding peer will have the - * tunnel deactivated, while the requesting peer gets no reply - * and keeps the tunnel. The hope is that the requesting peer - * will try again and get a useful response. */ - } else if (p->type == GTP_DELETE_PDP_RSP) { - /* Find the Delete Request for this Response. */ - struct pending_delete *pd = NULL; - - struct pending_delete *pdi; - llist_for_each_entry(pdi, &hub->pending_deletes, entry) { - if (known_tun == pdi->tun) { - pd = pdi; - break; - } - } - - if (!pd) { - LOG(LOGL_ERROR, "Delete PDP Context Response:" - " Cannot find matching request."); - /* If we delete the tunnel now, anyone can send a - * Delete response to kill tunnels at will. */ - return -1; - } - - /* TODO handle teardown_ind and nsapi */ - - expiring_item_del(&pd->expiry_entry); - - uint8_t cause; - if (gtpie_gettv1(p->ie, GTPIE_CAUSE, 0, &cause) != 0) { - LOG(LOGL_ERROR, "Delete PDP Context Response:" - " Missing Cause IE."); - /* If we delete the tunnel now, at least one of the - * peers may still think it is active. */ - return -1; - } - - if (cause != GTPCAUSE_ACC_REQ) { - LOG(LOGL_NOTICE, - "Delete PDP Context Response indicates failure;" - "for %s\n", - gtphub_tunnel_str(known_tun)); - return -1; - } - - LOG(LOGL_DEBUG, "Delete PDP Context: removing tunnel %s\n", - gtphub_tunnel_str(known_tun)); - p->tun = NULL; - expiring_item_del(&known_tun->expiry_entry); - } - - return 0; -} - -static int gtphub_handle_update_pdp_ctx(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from_ctrl, - struct gtphub_peer_port *to_ctrl) -{ - /* TODO */ - return 0; -} - -/* Read GSN address IEs from p, and make sure these peer addresses exist in - * bind[plane_idx] with default ports, in their respective planes (both Ctrl - * and User). Map TEIs announced in IEs, and write mapped TEIs in-place into - * the packet p. */ -static int gtphub_handle_pdp_ctx(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from_ctrl, - struct gtphub_peer_port *to_ctrl) -{ - OSMO_ASSERT(p->plane_idx == GTPH_PLANE_CTRL); - - switch (p->type) { - case GTP_CREATE_PDP_REQ: - case GTP_CREATE_PDP_RSP: - return gtphub_handle_create_pdp_ctx(hub, p, - from_ctrl, to_ctrl); - - case GTP_DELETE_PDP_REQ: - case GTP_DELETE_PDP_RSP: - return gtphub_handle_delete_pdp_ctx(hub, p, - from_ctrl, to_ctrl); - - case GTP_UPDATE_PDP_REQ: - case GTP_UPDATE_PDP_RSP: - return gtphub_handle_update_pdp_ctx(hub, p, - from_ctrl, to_ctrl); - - default: - /* Nothing to do for this message type. */ - return 0; - } - -} - -static int gtphub_send_del_pdp_ctx(struct gtphub *hub, - struct gtphub_tunnel *tun, - int to_side) -{ - static uint8_t del_ctx_msg[16] = { - 0x32, /* GTP v1 flags */ - GTP_DELETE_PDP_REQ, - 0x00, 0x08, /* Length in network byte order */ - 0x00, 0x00, 0x00, 0x00, /* TEI to be replaced */ - 0, 0, /* Seq, to be replaced */ - 0, 0, /* no extensions */ - 0x13, 0xff, /* 19: Teardown ind = 1 */ - 0x14, 0 /* 20: NSAPI = 0 */ - }; - - uint32_t *tei = (uint32_t*)&del_ctx_msg[4]; - uint16_t *seq = (uint16_t*)&del_ctx_msg[8]; - - struct gtphub_tunnel_endpoint *te = - &tun->endpoint[to_side][GTPH_PLANE_CTRL]; - - if (! te->peer) - return 0; - - *tei = hton32(te->tei_orig); - *seq = hton16(nr_pool_next(&te->peer->peer_addr->peer->seq_pool)); - - struct gtphub_bind *to_bind = &hub->to_gsns[to_side][GTPH_PLANE_CTRL]; - int rc = gtphub_write(&to_bind->ofd, &te->peer->sa, - del_ctx_msg, sizeof(del_ctx_msg)); - if (rc != 0) { - LOG(LOGL_ERROR, - "Failed to send out-of-band Delete PDP Context Request to %s\n", - gtphub_port_str(te->peer)); - } - return rc; -} - -/* Tell all peers on the other end of tunnels that PDP contexts are void. */ -static void gtphub_restarted(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *pp) -{ - LOG(LOGL_NOTICE, "Peer has restarted: %s\n", - gtphub_port_str(pp)); - - int deleted_count = 0; - struct gtphub_tunnel *tun; - llist_for_each_entry(tun, &hub->tunnels, entry) { - int side_idx; - for_each_side(side_idx) { - struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; - struct gtphub_tunnel_endpoint *te2 = &tun->endpoint[other_side_idx(side_idx)][GTPH_PLANE_CTRL]; - if ((!te->peer) - || (!te2->tei_orig) - || (pp->peer_addr->peer != te->peer->peer_addr->peer)) - continue; - - LOG(LOGL_DEBUG, "Deleting tunnel due to peer restart: %s\n", - gtphub_tunnel_str(tun)); - deleted_count ++; - - /* Send a Delete PDP Context Request to the - * peer on the other side, remember the pending - * delete and wait for the response to delete - * the tunnel. Clear this side of the tunnel to - * make sure it isn't used. - * - * Should the delete message send fail, or if no - * response is received, this tunnel will expire. If - * its TEIs come up in a new PDP Context Request, it - * will be removed. If messages for this tunnel should - * come in (from the not restarted side), they will be - * dropped because the tunnel is rendered unusable. */ - gtphub_send_del_pdp_ctx(hub, tun, other_side_idx(side_idx)); - - gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_CTRL], - NULL); - gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_USER], - NULL); - } - } - - if (deleted_count) - LOG(LOGL_NOTICE, "Deleting %d tunnels due to restart of: %s\n", - deleted_count, - gtphub_port_str(pp)); -} - -static int get_restart_count(struct gtp_packet_desc *p) -{ - int ie_idx; - ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); - if (ie_idx < 0) - return -1; - return ntoh8(p->ie[ie_idx]->tv1.v); -} - -static void gtphub_check_restart_counter(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from) -{ - /* If the peer is sending a Recovery IE (7.7.11) with a restart counter - * that doesn't match the peer's previously sent restart counter, clear - * that peer and cancel PDP contexts. */ - - int restart = get_restart_count(p); - - if ((restart < 0) || (restart > 255)) - return; - - if ((from->last_restart_count >= 0) && (from->last_restart_count <= 255)) { - if (from->last_restart_count != restart) { - gtphub_restarted(hub, p, from); - } - } - - from->last_restart_count = restart; -} - -static int from_sgsns_read_cb(struct osmo_fd *from_sgsns_ofd, unsigned int what) -{ - unsigned int plane_idx = from_sgsns_ofd->priv_nr; - OSMO_ASSERT(plane_idx < GTPH_PLANE_N); - LOG(LOGL_DEBUG, "=== reading from SGSN (%s)\n", - gtphub_plane_idx_names[plane_idx]); - - if (!(what & BSC_FD_READ)) - return 0; - - struct gtphub *hub = from_sgsns_ofd->data; - - static uint8_t buf[4096]; - struct osmo_sockaddr from_addr; - struct osmo_sockaddr to_addr; - struct osmo_fd *to_ofd; - int len; - uint8_t *reply_buf; - - len = gtphub_read(from_sgsns_ofd, &from_addr, buf, sizeof(buf)); - if (len < 1) - return 0; - - len = gtphub_handle_buf(hub, GTPH_SIDE_SGSN, plane_idx, &from_addr, - buf, len, gtphub_now(), - &reply_buf, &to_ofd, &to_addr); - if (len < 1) - return 0; - - return gtphub_write(to_ofd, &to_addr, reply_buf, len); -} - -static int from_ggsns_read_cb(struct osmo_fd *from_ggsns_ofd, unsigned int what) -{ - unsigned int plane_idx = from_ggsns_ofd->priv_nr; - OSMO_ASSERT(plane_idx < GTPH_PLANE_N); - LOG(LOGL_DEBUG, "=== reading from GGSN (%s)\n", - gtphub_plane_idx_names[plane_idx]); - if (!(what & BSC_FD_READ)) - return 0; - - struct gtphub *hub = from_ggsns_ofd->data; - - static uint8_t buf[4096]; - struct osmo_sockaddr from_addr; - struct osmo_sockaddr to_addr; - struct osmo_fd *to_ofd; - int len; - uint8_t *reply_buf; - - len = gtphub_read(from_ggsns_ofd, &from_addr, buf, sizeof(buf)); - if (len < 1) - return 0; - - len = gtphub_handle_buf(hub, GTPH_SIDE_GGSN, plane_idx, &from_addr, - buf, len, gtphub_now(), - &reply_buf, &to_ofd, &to_addr); - if (len < 1) - return 0; - - return gtphub_write(to_ofd, &to_addr, reply_buf, len); -} - -static int gtphub_unmap(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port *from, - struct gtphub_peer_port *to_proxy, - struct gtphub_peer_port **final_unmapped, - struct gtphub_peer_port **unmapped_from_seq) -{ - /* Always (try to) unmap sequence and TEI numbers, which need to be - * replaced in the packet. Either way, give precedence to the proxy, if - * configured. */ - - if (unmapped_from_seq) - *unmapped_from_seq = NULL; - if (final_unmapped) - *final_unmapped = NULL; - p->tun = NULL; - - struct gtphub_peer_port *from_seq = NULL; - struct gtphub_peer_port *from_tei = NULL; - struct gtphub_peer_port *unmapped = NULL; - - from_seq = gtphub_unmap_seq(p, from); - - if (gtphub_unmap_header_tei(&from_tei, &p->tun, hub, p, from) < 0) - return -1; - - struct gtphub_peer *from_peer = from->peer_addr->peer; - if (from_seq && from_tei && (from_seq != from_tei)) { - LOG(LOGL_DEBUG, - "Seq unmap and TEI unmap yield two different peers." - " Using seq unmap." - " (from %s %s: seq %d yields %s, tei %u yields %s)\n", - gtphub_plane_idx_names[p->plane_idx], - gtphub_peer_str(from_peer), - (int)p->seq, - gtphub_port_str(from_seq), - (unsigned int)p->header_tei_rx, - gtphub_port_str2(from_tei) - ); - } - unmapped = (from_seq? from_seq : from_tei); - - if (unmapped && to_proxy && (unmapped != to_proxy)) { - LOG(LOGL_NOTICE, - "Unmap yields a different peer than the configured proxy." - " Using proxy." - " unmapped: %s proxy: %s\n", - gtphub_port_str(unmapped), - gtphub_port_str2(to_proxy) - ); - } - unmapped = (to_proxy? to_proxy : unmapped); - - if (!unmapped) { - /* Return no error, but returned pointers are all NULL. */ - return 0; - } - - if (unmapped_from_seq) - *unmapped_from_seq = from_seq; - if (final_unmapped) - *final_unmapped = unmapped; - return 0; -} - -static int gsn_addr_to_sockaddr(struct gsn_addr *src, - uint16_t port, - struct osmo_sockaddr *dst) -{ - return osmo_sockaddr_init_udp(dst, gsn_addr_to_str(src), port); -} - -/* If p is an Echo request, replace p's data with the matching response and - * return 1. If p is no Echo request, return 0, or -1 if an invalid packet is - * detected. */ -static int gtphub_handle_echo_req(struct gtphub *hub, struct gtp_packet_desc *p, - uint8_t **reply_buf) -{ - if (p->type != GTP_ECHO_REQ) - return 0; - - static uint8_t echo_response_data[14] = { - 0x32, /* GTP v1 flags */ - GTP_ECHO_RSP, - 0x00, 14 - 8, /* Length in network byte order */ - 0x00, 0x00, 0x00, 0x00, /* Zero TEI */ - 0, 0, /* Seq, to be replaced */ - 0, 0, /* no extensions */ - 0x0e, /* Recovery IE */ - 0 /* Restart counter, to be replaced */ - }; - uint16_t *seq = (uint16_t*)&echo_response_data[8]; - uint8_t *recovery = &echo_response_data[13]; - - *seq = hton16(p->seq); - *recovery = hub->restart_counter; - - *reply_buf = echo_response_data; - - return sizeof(echo_response_data); -} - -struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, - const struct osmo_sockaddr *addr); - -/* Parse buffer as GTP packet, replace elements in-place and return the ofd and - * address to forward to. Return a pointer to the osmo_fd, but copy the - * sockaddr to *to_addr. The reason for this is that the sockaddr may expire at - * any moment, while the osmo_fd is guaranteed to persist. Return the number of - * bytes to forward, 0 or less on failure. */ -int gtphub_handle_buf(struct gtphub *hub, - unsigned int side_idx, - unsigned int plane_idx, - const struct osmo_sockaddr *from_addr, - uint8_t *buf, - size_t received, - time_t now, - uint8_t **reply_buf, - struct osmo_fd **to_ofd, - struct osmo_sockaddr *to_addr) -{ - struct gtphub_bind *from_bind = &hub->to_gsns[side_idx][plane_idx]; - struct gtphub_bind *to_bind = &hub->to_gsns[other_side_idx(side_idx)][plane_idx]; - - rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_IN], - received); - - struct gtp_packet_desc p; - gtp_decode(buf, received, side_idx, plane_idx, &p, now); - - LOG(LOGL_DEBUG, "%s rx %s from %s %s%s\n", - (side_idx == GTPH_SIDE_GGSN)? "<-" : "->", - gtphub_plane_idx_names[plane_idx], - gtphub_side_idx_names[side_idx], - osmo_sockaddr_to_str(from_addr), - gtp_type_str(p.type)); - - if (p.rc <= 0) { - LOG(LOGL_ERROR, "INVALID: dropping GTP packet%s from %s %s %s\n", - gtp_type_str(p.type), - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - osmo_sockaddr_to_str(from_addr)); - return -1; - } - - rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_IN]); - - int reply_len; - reply_len = gtphub_handle_echo_req(hub, &p, reply_buf); - if (reply_len > 0) { - /* It was an echo. Nothing left to do. */ - osmo_sockaddr_copy(to_addr, from_addr); - *to_ofd = &from_bind->ofd; - - rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); - rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], - reply_len); - LOG(LOGL_DEBUG, "%s Echo response to %s: %d bytes to %s\n", - (side_idx == GTPH_SIDE_GGSN)? "-->" : "<--", - gtphub_side_idx_names[side_idx], - (int)reply_len, osmo_sockaddr_to_str(to_addr)); - return reply_len; - } - if (reply_len < 0) - return -1; - - *to_ofd = &to_bind->ofd; - - /* If a proxy is configured, check that it's indeed that proxy talking - * to us. A proxy is a forced 1:1 connection, e.g. to another gtphub, - * so no-one else is allowed to talk to us from that side. */ - struct gtphub_peer_port *from_peer = hub->proxy[side_idx][plane_idx]; - if (from_peer) { - if (osmo_sockaddr_cmp(&from_peer->sa, from_addr) != 0) { - LOG(LOGL_ERROR, - "Rejecting: %s proxy configured, but GTP packet" - " received on %s bind is from another sender:" - " proxy: %s sender: %s\n", - gtphub_side_idx_names[side_idx], - gtphub_side_idx_names[side_idx], - gtphub_port_str(from_peer), - osmo_sockaddr_to_str(from_addr)); - return -1; - } - } - - if (!from_peer) { - /* Find or create a peer with a matching address. The sender's - * port may in fact differ. */ - from_peer = gtphub_known_addr_have_port(from_bind, from_addr); - } - - /* If any PDP context has been created, we already have an entry for - * this GSN. If we don't have an entry, a GGSN has nothing to tell us - * about, while an SGSN may initiate a PDP context. */ - if (!from_peer) { - if (side_idx == GTPH_SIDE_GGSN) { - LOG(LOGL_ERROR, "Dropping packet%s: unknown GGSN peer: %s\n", - gtp_type_str(p.type), - osmo_sockaddr_to_str(from_addr)); - return -1; - } else { - /* SGSN */ - /* A new peer. If this is on the Ctrl plane, an SGSN - * may make first contact without being known yet, so - * create the peer struct for the current sender. */ - if (plane_idx != GTPH_PLANE_CTRL) { - LOG(LOGL_ERROR, - "Dropping packet%s: User plane peer was not" - "announced by PDP Context: %s\n", - gtp_type_str(p.type), - osmo_sockaddr_to_str(from_addr)); - return -1; - } - - struct gsn_addr from_gsna; - uint16_t from_port; - if (gsn_addr_from_sockaddr(&from_gsna, &from_port, from_addr) != 0) - return -1; - - from_peer = gtphub_port_have(hub, from_bind, &from_gsna, from_port); - } - } - - if (!from_peer) { - /* This could theoretically happen for invalid address data or - * somesuch. */ - LOG(LOGL_ERROR, "Dropping packet%s: invalid %s peer: %s\n", - gtp_type_str(p.type), - gtphub_side_idx_names[side_idx], - osmo_sockaddr_to_str(from_addr)); - return -1; - } - - rate_ctr_add(&from_peer->counters_io->ctr[GTPH_CTR_BYTES_IN], - received); - rate_ctr_inc(&from_peer->counters_io->ctr[GTPH_CTR_PKTS_IN]); - - LOG(LOGL_DEBUG, "from %s peer: %s\n", gtphub_side_idx_names[side_idx], - gtphub_port_str(from_peer)); - - gtphub_check_restart_counter(hub, &p, from_peer); - gtphub_map_restart_counter(hub, &p); - - struct gtphub_peer_port *to_peer_from_seq; - struct gtphub_peer_port *to_peer; - if (gtphub_unmap(hub, &p, from_peer, - hub->proxy[other_side_idx(side_idx)][plane_idx], - &to_peer, &to_peer_from_seq) - != 0) { - return -1; - } - - if (p.tun) { - struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[p.side_idx][p.plane_idx]; - rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_IN], - received); - rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_IN]); - } - - if ((!to_peer) && (side_idx == GTPH_SIDE_SGSN)) { - if (gtphub_resolve_ggsn(hub, &p, &to_peer) < 0) - return -1; - } - - if (!to_peer && p.tun && p.type == GTP_DELETE_PDP_RSP) { - /* It's a delete confirmation for a tunnel that is partly - * invalid, probably marked unsuable due to a restarted peer. - * Remove the tunnel and be happy without forwarding. */ - expiring_item_del(&p.tun->expiry_entry); - p.tun = NULL; - return 0; - } - - if (!to_peer) { - LOG(LOGL_ERROR, "No %s to send to. Dropping packet%s" - " (type=%" PRIu8 ", header-TEI=%" PRIx32 ", seq=%" PRIx16 ").\n", - gtphub_side_idx_names[other_side_idx(side_idx)], - gtp_type_str(p.type), - p.type, p.header_tei_rx, p.seq - ); - return -1; - } - - if (plane_idx == GTPH_PLANE_CTRL) { - /* This may be a Create PDP Context response. If it is, there - * are other addresses in the GTP message to set up apart from - * the sender. */ - if (gtphub_handle_pdp_ctx(hub, &p, from_peer, to_peer) - != 0) - return -1; - } - - /* Either to_peer was resolved from an existing tunnel, - * or a PDP Ctx and thus a tunnel has just been created, - * or the tunnel has been deleted due to this message. */ - OSMO_ASSERT(p.tun || (p.type == GTP_DELETE_PDP_RSP)); - - /* If the GGSN is replying to an SGSN request, the sequence nr has - * already been unmapped above (to_peer_from_seq != NULL), and we need not - * create a new mapping. */ - if (!to_peer_from_seq) - gtphub_map_seq(&p, from_peer, to_peer); - - osmo_sockaddr_copy(to_addr, &to_peer->sa); - - *reply_buf = (uint8_t*)p.data; - - if (received) { - rate_ctr_inc(&to_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); - rate_ctr_add(&to_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], - received); - - rate_ctr_inc(&to_peer->counters_io->ctr[GTPH_CTR_PKTS_OUT]); - rate_ctr_add(&to_peer->counters_io->ctr[GTPH_CTR_BYTES_OUT], - received); - } - - if (p.tun) { - struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[other_side_idx(p.side_idx)][p.plane_idx]; - rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_OUT]); - rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_OUT], - received); - } - - LOG(LOGL_DEBUG, "%s Forward to %s:" - " header-TEI %" PRIx32", seq %" PRIx16", %d bytes to %s\n", - (side_idx == GTPH_SIDE_SGSN)? "-->" : "<--", - gtphub_side_idx_names[other_side_idx(side_idx)], - p.header_tei, p.seq, - (int)received, osmo_sockaddr_to_str(to_addr)); - return received; -} - -static void resolved_gssn_del_cb(struct expiring_item *expi) -{ - struct gtphub_resolved_ggsn *ggsn; - ggsn = container_of(expi, struct gtphub_resolved_ggsn, expiry_entry); - - gtphub_port_ref_count_dec(ggsn->peer); - llist_del(&ggsn->entry); - - ggsn->expiry_entry.del_cb = 0; - expiring_item_del(&ggsn->expiry_entry); - - talloc_free(ggsn); -} - -void gtphub_resolved_ggsn(struct gtphub *hub, const char *apn_oi_str, - struct gsn_addr *resolved_addr, - time_t now) -{ - struct gtphub_peer_port *pp; - struct gtphub_resolved_ggsn *ggsn; - - LOG(LOGL_DEBUG, "Resolved GGSN callback: %s %s\n", - apn_oi_str, osmo_hexdump((unsigned char*)resolved_addr, - sizeof(*resolved_addr))); - - pp = gtphub_port_have(hub, &hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], - resolved_addr, 2123); - if (!pp) { - LOG(LOGL_ERROR, "Internal: Cannot create/find peer '%s'\n", - gsn_addr_to_str(resolved_addr)); - return; - } - - ggsn = talloc_zero(osmo_gtphub_ctx, struct gtphub_resolved_ggsn); - OSMO_ASSERT(ggsn); - INIT_LLIST_HEAD(&ggsn->entry); - expiring_item_init(&ggsn->expiry_entry); - - ggsn->peer = pp; - gtphub_port_ref_count_inc(pp); - - osmo_strlcpy(ggsn->apn_oi_str, apn_oi_str, sizeof(ggsn->apn_oi_str)); - - ggsn->expiry_entry.del_cb = resolved_gssn_del_cb; - expiry_add(&hub->expire_slowly, &ggsn->expiry_entry, now); - - llist_add(&ggsn->entry, &hub->resolved_ggsns); -} - -static int gtphub_gc_peer_port(struct gtphub_peer_port *pp) -{ - return pp->ref_count == 0; -} - -static int gtphub_gc_peer_addr(struct gtphub_peer_addr *pa) -{ - struct gtphub_peer_port *pp, *npp; - llist_for_each_entry_safe(pp, npp, &pa->ports, entry) { - if (gtphub_gc_peer_port(pp)) { - LOG(LOGL_DEBUG, "expired: peer %s\n", - gtphub_port_str(pp)); - gtphub_peer_port_del(pp); - } - } - return llist_empty(&pa->ports); -} - -static int gtphub_gc_peer(struct gtphub_peer *p) -{ - struct gtphub_peer_addr *pa, *npa; - llist_for_each_entry_safe(pa, npa, &p->addresses, entry) { - if (gtphub_gc_peer_addr(pa)) { - gtphub_peer_addr_del(pa); - } - } - - /* Note that there's a ref_count in each gtphub_peer_port instance - * listed within p->addresses, referenced by TEI mappings from - * hub->tei_map. As long as those don't expire, this peer will stay. */ - - return llist_empty(&p->addresses) - && nr_map_empty(&p->seq_map); -} - -static void gtphub_gc_bind(struct gtphub_bind *b) -{ - struct gtphub_peer *p, *n; - llist_for_each_entry_safe(p, n, &b->peers, entry) { - if (gtphub_gc_peer(p)) { - gtphub_peer_del(p); - } - } -} - -void gtphub_gc(struct gtphub *hub, time_t now) -{ - int expired; - expired = expiry_tick(&hub->expire_quickly, now); - expired += expiry_tick(&hub->expire_slowly, now); - - /* ... */ - - if (expired) { - int s, p; - for_each_side_and_plane(s, p) { - gtphub_gc_bind(&hub->to_gsns[s][p]); - } - } -} - -static void gtphub_gc_cb(void *data) -{ - struct gtphub *hub = data; - gtphub_gc(hub, gtphub_now()); - osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); -} - -static void gtphub_gc_start(struct gtphub *hub) -{ - osmo_timer_setup(&hub->gc_timer, gtphub_gc_cb, hub); - osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); -} - -/* called by unit tests */ -void gtphub_init(struct gtphub *hub) -{ - gtphub_zero(hub); - - INIT_LLIST_HEAD(&hub->tunnels); - INIT_LLIST_HEAD(&hub->pending_deletes); - - expiry_init(&hub->expire_quickly, GTPH_EXPIRE_QUICKLY_SECS); - expiry_init(&hub->expire_slowly, GTPH_EXPIRE_SLOWLY_MINUTES * 60); - - nr_pool_init(&hub->tei_pool, 1, 0xffffffff); - - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - gtphub_bind_init(&hub->to_gsns[side_idx][plane_idx], CTR_IDX_HUB(side_idx, plane_idx)); - } - - hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].label = "SGSN Ctrl"; - hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].label = "GGSN Ctrl"; - hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].label = "SGSN User"; - hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].label = "GGSN User"; -} - -/* For the test suite, this is kept separate from gtphub_stop(), which also - * closes sockets. The test suite avoids using sockets and would cause - * segfaults when trying to close uninitialized ofds. */ -void gtphub_free(struct gtphub *hub) -{ - /* By expiring all mappings, a garbage collection should free - * everything else. A gtphub_bind_free() will assert that everything is - * indeed empty. */ - expiry_clear(&hub->expire_quickly); - expiry_clear(&hub->expire_slowly); - - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - gtphub_gc_bind(&hub->to_gsns[side_idx][plane_idx]); - gtphub_bind_free(&hub->to_gsns[side_idx][plane_idx]); - } -} - -void gtphub_stop(struct gtphub *hub) -{ - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - gtphub_bind_stop(&hub->to_gsns[side_idx][plane_idx]); - } - gtphub_free(hub); -} - -static int gtphub_make_proxy(struct gtphub *hub, - struct gtphub_peer_port **pp, - struct gtphub_bind *bind, - const struct gtphub_cfg_addr *addr) -{ - if (!addr->addr_str) - return 0; - - struct gsn_addr gsna; - if (gsn_addr_from_str(&gsna, addr->addr_str) != 0) - return -1; - - *pp = gtphub_port_have(hub, bind, &gsna, addr->port); - - /* This is *the* proxy. Make sure it is never expired. */ - gtphub_port_ref_count_inc(*pp); - return 0; -} - -int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg, - uint8_t restart_counter) -{ - gtphub_init(hub); - - hub->restart_counter = restart_counter; - hub->sgsn_use_sender = cfg->sgsn_use_sender? 1 : 0; - - /* If a Ctrl plane proxy is configured, ares will never be used. */ - if (!cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) { - if (gtphub_ares_init(hub) != 0) { - LOG(LOGL_FATAL, "Failed to initialize ares\n"); - return -1; - } - } - - int side_idx; - int plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - int rc; - rc = gtphub_bind_start(&hub->to_gsns[side_idx][plane_idx], - &cfg->to_gsns[side_idx][plane_idx], - (side_idx == GTPH_SIDE_SGSN) - ? from_sgsns_read_cb - : from_ggsns_read_cb, - hub, plane_idx); - if (rc) { - LOG(LOGL_FATAL, "Failed to bind for %ss (%s)\n", - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx]); - return rc; - } - } - - for_each_side_and_plane(side_idx, plane_idx) { - if (gtphub_make_proxy(hub, - &hub->proxy[side_idx][plane_idx], - &hub->to_gsns[side_idx][plane_idx], - &cfg->proxy[side_idx][plane_idx]) - != 0) { - LOG(LOGL_FATAL, "Cannot configure %s proxy" - " %s port %d.\n", - gtphub_side_idx_names[side_idx], - cfg->proxy[side_idx][plane_idx].addr_str, - (int)cfg->proxy[side_idx][plane_idx].port); - return -1; - } - } - - for_each_side_and_plane(side_idx, plane_idx) { - if (hub->proxy[side_idx][plane_idx]) - LOG(LOGL_NOTICE, "Using %s %s proxy %s\n", - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - gtphub_port_str(hub->proxy[side_idx][plane_idx])); - } - - if (hub->sgsn_use_sender) - LOG(LOGL_NOTICE, "Using sender address and port for SGSN instead of GSN Addr IE and default ports.\n"); - - gtphub_gc_start(hub); - return 0; -} - -static struct gtphub_peer_addr *gtphub_peer_find_addr(const struct gtphub_peer *peer, - const struct gsn_addr *addr) -{ - struct gtphub_peer_addr *a; - llist_for_each_entry(a, &peer->addresses, entry) { - if (gsn_addr_same(&a->addr, addr)) - return a; - } - return NULL; -} - -static struct gtphub_peer_port *gtphub_addr_find_port(const struct gtphub_peer_addr *a, - uint16_t port) -{ - OSMO_ASSERT(port); - struct gtphub_peer_port *pp; - llist_for_each_entry(pp, &a->ports, entry) { - if (pp->port == port) - return pp; - } - return NULL; -} - -static struct gtphub_peer_addr *gtphub_addr_find(const struct gtphub_bind *bind, - const struct gsn_addr *addr) -{ - struct gtphub_peer *peer; - llist_for_each_entry(peer, &bind->peers, entry) { - struct gtphub_peer_addr *a = gtphub_peer_find_addr(peer, addr); - if (a) - return a; - } - return NULL; -} - -static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind, - const struct gsn_addr *addr, - uint16_t port) -{ - struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); - if (!a) - return NULL; - return gtphub_addr_find_port(a, port); -} - -struct gtphub_peer_port *gtphub_port_find_sa(const struct gtphub_bind *bind, - const struct osmo_sockaddr *addr) -{ - struct gsn_addr gsna; - uint16_t port; - if (gsn_addr_from_sockaddr(&gsna, &port, addr) != 0) - return NULL; - - return gtphub_port_find(bind, &gsna, port); -} - -static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub, - struct gtphub_bind *bind) -{ - struct gtphub_peer *peer = talloc_zero(osmo_gtphub_ctx, - struct gtphub_peer); - OSMO_ASSERT(peer); - - INIT_LLIST_HEAD(&peer->addresses); - - nr_pool_init(&peer->seq_pool, 0, 0xffff); - nr_map_init(&peer->seq_map, &peer->seq_pool, &hub->expire_quickly); - - /* TODO use something random to pick the initial sequence nr. - 0x6d31 produces the ASCII character sequence 'm1', currently used in - gtphub_nc_test.sh. */ - peer->seq_pool.last_nr = 0x6d31 - 1; - - llist_add(&peer->entry, &bind->peers); - return peer; -} - -static struct gtphub_peer_addr *gtphub_peer_add_addr(struct gtphub_peer *peer, - const struct gsn_addr *addr) -{ - struct gtphub_peer_addr *a; - a = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_addr); - OSMO_ASSERT(a); - a->peer = peer; - gsn_addr_copy(&a->addr, addr); - INIT_LLIST_HEAD(&a->ports); - llist_add(&a->entry, &peer->addresses); - - return a; -} - -static struct gtphub_peer_addr *gtphub_addr_have(struct gtphub *hub, - struct gtphub_bind *bind, - const struct gsn_addr *addr) -{ - struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); - if (a) - return a; - - /* If we haven't found an address, that means we need to create an - * entirely new peer for the new address. More addresses may be added - * to this peer later, but not via this function. */ - struct gtphub_peer *peer = gtphub_peer_new(hub, bind); - - a = gtphub_peer_add_addr(peer, addr); - - LOG(LOGL_DEBUG, "New peer address: %s %s\n", - bind->label, - gsn_addr_to_str(&a->addr)); - - return a; -} - -static struct gtphub_peer_port *gtphub_addr_add_port(struct gtphub_peer_addr *a, - uint16_t port) -{ - struct gtphub_peer_port *pp; - - pp = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_port); - OSMO_ASSERT(pp); - pp->peer_addr = a; - pp->port = port; - pp->last_restart_count = -1; - - if (gsn_addr_to_sockaddr(&a->addr, port, &pp->sa) != 0) { - talloc_free(pp); - return NULL; - } - - pp->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, - >phub_ctrg_io_desc, port); - if (!pp->counters_io) { - LOG(LOGL_ERROR, "Failed to allocate rate counters for %s:%u\n", gsn_addr_to_str(&a->addr), port); - talloc_free(pp); - return NULL; - } - - llist_add(&pp->entry, &a->ports); - - LOG(LOGL_DEBUG, "New peer port: %s port %d\n", - gsn_addr_to_str(&a->addr), - (int)port); - - return pp; -} - -struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub, - struct gtphub_bind *bind, - const struct gsn_addr *addr, - uint16_t port) -{ - struct gtphub_peer_addr *a = gtphub_addr_have(hub, bind, addr); - - struct gtphub_peer_port *pp = gtphub_addr_find_port(a, port); - if (pp) - return pp; - - return gtphub_addr_add_port(a, port); -} - -/* Find a GGSN peer with a matching address. If the address is known but the - * port not, create a new port for that peer address. */ -struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, - const struct osmo_sockaddr *addr) -{ - struct gtphub_peer_addr *pa; - struct gtphub_peer_port *pp; - - struct gsn_addr gsna; - uint16_t port; - int rc = gsn_addr_from_sockaddr(&gsna, &port, addr); - if (rc < 0) - LOG(LOGL_ERROR, "%s(): failed to obtain GSN address\n", __func__); - - pa = gtphub_addr_find(bind, &gsna); - if (!pa) - return NULL; - - pp = gtphub_addr_find_port(pa, port); - - if (!pp) - pp = gtphub_addr_add_port(pa, port); - - return pp; -} - - -/* Return 0 if the message in p is not applicable for GGSN resolution, -1 if - * resolution should be possible but failed, and 1 if resolution was - * successful. *pp will be set to NULL if <1 is returned. */ -static int gtphub_resolve_ggsn(struct gtphub *hub, - struct gtp_packet_desc *p, - struct gtphub_peer_port **pp) -{ - *pp = NULL; - - /* TODO determine from message type whether IEs should be present? */ - - int rc; - const char *imsi_str; - rc = get_ie_imsi_str(p->ie, 0, &imsi_str); - if (rc < 1) - return rc; - OSMO_ASSERT(imsi_str); - - const char *apn_str; - rc = get_ie_apn_str(p->ie, &apn_str); - if (rc < 1) - return rc; - OSMO_ASSERT(apn_str); - - *pp = gtphub_resolve_ggsn_addr(hub, imsi_str, apn_str); - return (*pp)? 1 : -1; -} - - -/* TODO move to osmocom/core/socket.c ? */ -/* use this in osmo_sock_init() to remove dup. */ -/* Internal: call getaddrinfo for osmo_sockaddr_init(). The caller is required - to call freeaddrinfo(*result), iff zero is returned. */ -static int _osmo_getaddrinfo(struct addrinfo **result, - uint16_t family, uint16_t type, uint8_t proto, - const char *host, uint16_t port) -{ - struct addrinfo hints; - char portbuf[16]; - - sprintf(portbuf, "%u", port); - memset(&hints, '\0', sizeof(struct addrinfo)); - hints.ai_family = family; - if (type == SOCK_RAW) { - /* Workaround for glibc, that returns EAI_SERVICE (-8) if - * SOCK_RAW and IPPROTO_GRE is used. - */ - hints.ai_socktype = SOCK_DGRAM; - hints.ai_protocol = IPPROTO_UDP; - } else { - hints.ai_socktype = type; - hints.ai_protocol = proto; - } - - return getaddrinfo(host, portbuf, &hints, result); -} - -/* TODO move to osmocom/core/socket.c ? */ -int osmo_sockaddr_init(struct osmo_sockaddr *addr, - uint16_t family, uint16_t type, uint8_t proto, - const char *host, uint16_t port) -{ - struct addrinfo *res; - int rc; - rc = _osmo_getaddrinfo(&res, family, type, proto, host, port); - - if (rc != 0) { - LOG(LOGL_ERROR, "getaddrinfo returned error %d\n", (int)rc); - return -EINVAL; - } - - OSMO_ASSERT(res->ai_addrlen <= sizeof(addr->a)); - memcpy(&addr->a, res->ai_addr, res->ai_addrlen); - addr->l = res->ai_addrlen; - freeaddrinfo(res); - - return 0; -} - -int osmo_sockaddr_to_strs(char *addr_str, size_t addr_str_len, - char *port_str, size_t port_str_len, - const struct osmo_sockaddr *addr, - int flags) -{ - int rc; - - if ((addr->l < 1) || (addr->l > sizeof(addr->a))) { - LOGP(DGTPHUB, LOGL_ERROR, "Invalid address size: %d\n", addr->l); - return -1; - } - - if (addr->l > sizeof(addr->a)) { - LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: too long: %d\n", - addr->l); - return -1; - } - - rc = getnameinfo((struct sockaddr*)&addr->a, addr->l, - addr_str, addr_str_len, - port_str, port_str_len, - flags); - - if (rc) - LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: %s: %s\n", - gai_strerror(rc), osmo_hexdump((uint8_t*)&addr->a, - addr->l)); - - return rc; -} - -const char *osmo_sockaddr_to_strb(const struct osmo_sockaddr *addr, - char *buf, size_t buf_len) -{ - const int portbuf_len = 6; - OSMO_ASSERT(buf_len > portbuf_len); - char *portbuf = buf + buf_len - portbuf_len; - buf_len -= portbuf_len; - if (osmo_sockaddr_to_strs(buf, buf_len, - portbuf, portbuf_len, - addr, - NI_NUMERICHOST | NI_NUMERICSERV)) - return NULL; - - char *pos = buf + strnlen(buf, buf_len-1); - size_t len = buf_len - (pos - buf); - - snprintf(pos, len, " port %s", portbuf); - buf[buf_len-1] = '\0'; - - return buf; -} - -const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *addr) -{ - static char buf[256]; - const char *result = osmo_sockaddr_to_strb(addr, buf, sizeof(buf)); - if (! result) - return "(invalid)"; - return result; -} - -int osmo_sockaddr_cmp(const struct osmo_sockaddr *a, - const struct osmo_sockaddr *b) -{ - if (a == b) - return 0; - if (!a) - return -1; - if (!b) - return 1; - if (a->l != b->l) { - /* Lengths are not the same, but determine the order. Will - * anyone ever sort a list by osmo_sockaddr though...? */ - int cmp = memcmp(&a->a, &b->a, (a->l < b->l)? a->l : b->l); - if (cmp == 0) { - if (a->l < b->l) - return -1; - else - return 1; - } - return cmp; - } - return memcmp(&a->a, &b->a, a->l); -} - -void osmo_sockaddr_copy(struct osmo_sockaddr *dst, - const struct osmo_sockaddr *src) -{ - OSMO_ASSERT(src->l <= sizeof(dst->a)); - memcpy(&dst->a, &src->a, src->l); - dst->l = src->l; -} diff --git a/src/gprs/gtphub_ares.c b/src/gprs/gtphub_ares.c deleted file mode 100644 index 87dc860c4..000000000 --- a/src/gprs/gtphub_ares.c +++ /dev/null @@ -1,220 +0,0 @@ -/* GTP Hub Implementation */ - -/* (C) 2015 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * gtphub_ares.c. - * - * This file is kept separate so that these functions can be wrapped for - * gtphub_test.c. When a function and its callers are in the same compilational - * unit, the wrappability may be optimized away. - * - * Author: Neels Hofmeyr - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see . - */ - -#include -#include - -#include -#include - -#include -#include - -/* TODO split GRX ares from sgsn into a separate struct and allow use without - * globals. */ -#include -extern struct sgsn_instance *sgsn; - -struct sgsn_instance sgsn_inst = { 0 }; -struct sgsn_instance *sgsn = &sgsn_inst; - -extern void *osmo_gtphub_ctx; - -int gtphub_ares_init(struct gtphub *hub) -{ - return sgsn_ares_init(sgsn); -} - -struct ggsn_lookup { - struct llist_head entry; - struct expiring_item expiry_entry; - - struct gtphub *hub; - - char imsi_str[GSM23003_IMSI_MAX_DIGITS+1]; - char apn_ni_str[GSM_APN_LENGTH]; - char apn_oi_str[GSM_APN_LENGTH]; - int have_3dig_mnc; -}; - -static int start_ares_query(struct ggsn_lookup *lookup); - -static void ggsn_lookup_cb(void *arg, int status, int timeouts, - struct hostent *hostent) -{ - struct ggsn_lookup *lookup = arg; - LOGP(DGTPHUB, LOGL_NOTICE, "ggsn_lookup_cb(%p / %p)", lookup, - &lookup->expiry_entry); - - if (status != ARES_SUCCESS) { - LOGP(DGTPHUB, LOGL_ERROR, "DNS query failed.\n"); - - /* Need to try with three digits now */ - if (!lookup->have_3dig_mnc) { - lookup->have_3dig_mnc = 1; - if (start_ares_query(lookup) == 0) - return; - } - - LOGP(DGTPHUB, LOGL_ERROR, "Failed to resolve GGSN. (%p)\n", - lookup); - goto remove_from_queue; - } - - struct gsn_addr resolved_addr; - if (hostent->h_length > sizeof(resolved_addr.buf)) { - LOGP(DGTPHUB, LOGL_ERROR, "Addr size too large: %d > %d\n", - (int)hostent->h_length, (int)sizeof(resolved_addr.buf)); - goto remove_from_queue; - } - - /* Get the first addr from the list */ - char *addr0 = hostent->h_addr_list[0]; - if (!addr0) { - LOGP(DGTPHUB, LOGL_ERROR, "No host address.\n"); - goto remove_from_queue; - } - - memcpy(resolved_addr.buf, addr0, hostent->h_length); - resolved_addr.len = hostent->h_length; - - LOGP(DGTPHUB, LOGL_NOTICE, "resolved addr %s\n", - osmo_hexdump((unsigned char*)&resolved_addr, - sizeof(resolved_addr))); - - gtphub_resolved_ggsn(lookup->hub, lookup->apn_oi_str, &resolved_addr, - gtphub_now()); - -remove_from_queue: - LOGP(DGTPHUB, LOGL_ERROR, "Removing GGSN lookup. (%p / %p)\n", lookup, - &lookup->expiry_entry); - expiring_item_del(&lookup->expiry_entry); -} - -static void make_addr_str(struct ggsn_lookup *lookup) -{ - char *apn_oi_str; - apn_oi_str = osmo_apn_qualify_from_imsi(lookup->imsi_str, - lookup->apn_ni_str, - lookup->have_3dig_mnc); - osmo_strlcpy(lookup->apn_oi_str, apn_oi_str, - sizeof(lookup->apn_oi_str)); -} - -static int start_ares_query(struct ggsn_lookup *lookup) -{ - LOGP(DGTPHUB, LOGL_DEBUG, "Going to query %s (%p / %p)\n", - lookup->apn_oi_str, lookup, &lookup->expiry_entry); - - int rc = sgsn_ares_query(sgsn, lookup->apn_oi_str, ggsn_lookup_cb, - lookup); - if (rc != 0) - LOGP(DGTPHUB, LOGL_ERROR, "Failed to start ares query.\n"); - return rc; -} - -static void ggsn_lookup_del_cb(struct expiring_item *expi) -{ - struct ggsn_lookup *lookup; - lookup = container_of(expi, struct ggsn_lookup, expiry_entry); - - LOGP(DGTPHUB, LOGL_NOTICE, "ggsn_lookup_del_cb(%p / %p)\n", lookup, - expi); - - lookup->expiry_entry.del_cb = 0; - expiring_item_del(expi); - - llist_del(&lookup->entry); - talloc_free(lookup); -} - -struct gtphub_peer_port *gtphub_resolve_ggsn_addr(struct gtphub *hub, - const char *imsi_str, - const char *apn_ni_str) -{ - OSMO_ASSERT(imsi_str); - OSMO_ASSERT(apn_ni_str); - - struct ggsn_lookup *lookup = talloc_zero(osmo_gtphub_ctx, - struct ggsn_lookup); - OSMO_ASSERT(lookup); - - LOGP(DGTPHUB, LOGL_DEBUG, "Request to resolve IMSI" - " '%s' with APN-NI '%s' (%p / %p)\n", - imsi_str, apn_ni_str, lookup, &lookup->expiry_entry); - - expiring_item_init(&lookup->expiry_entry); - lookup->hub = hub; - - osmo_strlcpy(lookup->imsi_str, imsi_str, sizeof(lookup->imsi_str)); - osmo_strlcpy(lookup->apn_ni_str, apn_ni_str, - sizeof(lookup->apn_ni_str)); - - make_addr_str(lookup); - - struct ggsn_lookup *active; - llist_for_each_entry(active, &hub->ggsn_lookups, entry) { - if (strncmp(active->apn_oi_str, lookup->apn_oi_str, - sizeof(lookup->apn_oi_str)) == 0) { - LOGP(DGTPHUB, LOGL_DEBUG, - "Query already pending for %s\n", - lookup->apn_oi_str); - /* A query already pending. Just tip our hat. */ - return NULL; - } - } - - struct gtphub_resolved_ggsn *resolved; - llist_for_each_entry(resolved, &hub->resolved_ggsns, entry) { - if (strncmp(resolved->apn_oi_str, lookup->apn_oi_str, - sizeof(lookup->apn_oi_str)) == 0) { - LOGP(DGTPHUB, LOGL_DEBUG, - "GGSN resolved from cache: %s -> %s\n", - lookup->apn_oi_str, - gtphub_port_str(resolved->peer)); - return resolved->peer; - } - } - - /* Kick off a resolution, but so far return nothing. The hope is that - * the peer will resend the request (a couple of times), and by then - * the GGSN will be resolved. */ - LOGP(DGTPHUB, LOGL_DEBUG, - "Sending out DNS query for %s..." - " (Returning failure, hoping for a retry once resolution" - " has concluded)\n", - lookup->apn_oi_str); - - llist_add(&lookup->entry, &hub->ggsn_lookups); - - lookup->expiry_entry.del_cb = ggsn_lookup_del_cb; - expiry_add(&hub->expire_quickly, &lookup->expiry_entry, gtphub_now()); - - start_ares_query(lookup); - - return NULL; -} diff --git a/src/gprs/gtphub_main.c b/src/gprs/gtphub_main.c deleted file mode 100644 index f693f0993..000000000 --- a/src/gprs/gtphub_main.c +++ /dev/null @@ -1,403 +0,0 @@ -/* GTP Hub main program */ - -/* (C) 2015 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * Author: Neels Hofmeyr - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see . - */ - -#include -#include -#include -#include -#include -#include - -#define _GNU_SOURCE -#include - -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -#include -#include -#include - -#include "../../bscconfig.h" - -#if BUILD_IU -#include -#endif - -extern void *osmo_gtphub_ctx; -void *tall_sgsn_ctx; - -const char *gtphub_copyright = - "Copyright (C) 2015 sysmocom s.f.m.c GmbH \r\n" - "License AGPLv3+: GNU AGPL version 2 or later \r\n" - "This is free software: you are free to change and redistribute it.\r\n" - "There is NO WARRANTY, to the extent permitted by law.\r\n"; - -static struct log_info_cat gtphub_categories[] = { - [DGTPHUB] = { - .name = "DGTPHUB", - .description = "GTP Hub", - .color = "\033[1;33m", - .enabled = 1, - .loglevel = LOGL_INFO, - }, -}; - -int gtphub_log_filter_fn(const struct log_context *ctx, - struct log_target *tar) -{ - return 0; -} - -static const struct log_info gtphub_log_info = { - .filter_fn = gtphub_log_filter_fn, - .cat = gtphub_categories, - .num_cat = ARRAY_SIZE(gtphub_categories), -}; - -void log_cfg(struct gtphub_cfg *cfg) -{ - int side_idx, plane_idx; - for_each_side_and_plane(side_idx, plane_idx) { - struct gtphub_cfg_addr *a; - a = &cfg->to_gsns[side_idx][plane_idx].bind; - LOGP(DGTPHUB, LOGL_NOTICE, - "to-%ss bind, %s: %s port %d\n", - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - a->addr_str, a->port); - } -} - -static void signal_handler(int signal) -{ - fprintf(stdout, "signal %d received\n", signal); - - switch (signal) { - case SIGINT: - case SIGTERM: - osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL); - sleep(1); - exit(0); - break; - case SIGABRT: - /* in case of abort, we want to obtain a talloc report - * and then return to the caller, who will abort the process */ - case SIGUSR1: - case SIGUSR2: - talloc_report_full(osmo_gtphub_ctx, stderr); - break; - default: - break; - } -} - -#if BUILD_IU -int gtphub_vty_go_parent(struct vty *vty) -{ - switch (vty->node) { - default: - osmo_ss7_vty_go_parent(vty); - } - - return vty->node; -} -#endif - -int gtphub_vty_is_config_node(struct vty *vty, int node) -{ - /* Check if libosmo-sccp declares the node in - * question as config node */ -#if BUILD_IU - if (osmo_ss7_is_config_node(vty, node)) - return 1; -#endif - - switch (node) { - /* add items that are not config */ - case CONFIG_NODE: - return 0; - - default: - return 1; - } -} - -static struct vty_app_info vty_info = { - .name = "OsmoGTPhub", - .version = PACKAGE_VERSION, -#if BUILD_IU - .go_parent_cb = gtphub_vty_go_parent, -#endif - .is_config_node = gtphub_vty_is_config_node, -}; - -struct cmdline_cfg { - const char *config_file; - const char *restart_counter_file; - int daemonize; -}; - -static uint8_t next_restart_count(const char *path) -{ - int umask_was = umask(022); - - uint8_t counter = 0; - - FILE *f = fopen(path, "r"); - if (f) { - int rc = fscanf(f, "%hhu", &counter); - - if (rc != 1) - goto failed_to_read; - - char c; - while (fread(&c, 1, 1, f) > 0) { - switch (c) { - case ' ': - case '\t': - case '\n': - case '\r': - break; - default: - goto failed_to_read; - } - } - fclose(f); - } - - counter ++; - - f = fopen(path, "w"); - if (!f) - goto failed_to_write; - if (fprintf(f, "%" PRIu8 "\n", counter) < 2) - goto failed_to_write; - if (fclose(f)) { - f = NULL; - goto failed_to_write; - } - - umask(umask_was); - - LOGP(DGTPHUB, LOGL_NOTICE, "Restarted with counter %hhu\n", counter); - return counter; - -failed_to_read: - fclose(f); - umask(umask_was); - LOGP(DGTPHUB, LOGL_FATAL, "Restart counter file cannot be parsed:" - " %s\n", path); - exit(1); - -failed_to_write: - if (f) - fclose(f); - umask(umask_was); - LOGP(DGTPHUB, LOGL_FATAL, "Restart counter file cannot be written:" - " %s\n", path); - exit(1); -} - -static void print_help(struct cmdline_cfg *ccfg) -{ - printf("gtphub commandline options\n"); - printf(" -h,--help This text.\n"); - printf(" -D,--daemonize Fork the process into a background daemon.\n"); - printf(" -d,--debug Enable Debugging for this category.\n"); - printf(" Pass '-d list' to get a category listing.\n"); - printf(" -s,--disable-color\n"); - printf(" -c,--config-file The config file to use [%s].\n", - ccfg->config_file); - printf(" -e,--log-level Set a global log level.\n"); - printf(" -r,--restart-file File for counting restarts [%s].\n", - ccfg->restart_counter_file); - printf(" -V,--version Print the version.\n"); -} - -static void list_categories(void) -{ - printf("Available debug categories:\n"); - int i; - for (i = 0; i < gtphub_log_info.num_cat; ++i) { - if (!gtphub_log_info.cat[i].name) - continue; - - printf("%s\n", gtphub_log_info.cat[i].name); - } -} - -static void handle_options(struct cmdline_cfg *ccfg, int argc, char **argv) -{ - while (1) { - int option_index = 0, c; - static struct option long_options[] = { - {"help", 0, 0, 'h'}, - {"debug", 1, 0, 'd'}, - {"daemonize", 0, 0, 'D'}, - {"config-file", 1, 0, 'c'}, - {"disable-color", 0, 0, 's'}, - {"timestamp", 0, 0, 'T'}, - {"log-level", 1, 0, 'e'}, - {"restart-file", 1, 0, 'r'}, - { "version", 0, 0, 'V' }, - {NULL, 0, 0, 0} - }; - - c = getopt_long(argc, argv, "hd:Dc:sTe:r:V", - long_options, &option_index); - if (c == -1) { - if (optind < argc) { - LOGP(DGTPHUB, LOGL_FATAL, - "Excess commandline arguments ('%s').\n", - argv[optind]); - exit(2); - } - break; - } - - switch (c) { - case 'h': - //print_usage(); - print_help(ccfg); - exit(0); - case 's': - log_set_use_color(osmo_stderr_target, 0); - break; - case 'd': - if (strcmp("list", optarg) == 0) { - list_categories(); - exit(0); - } else - log_parse_category_mask(osmo_stderr_target, optarg); - break; - case 'D': - ccfg->daemonize = 1; - break; - case 'c': - ccfg->config_file = optarg; - break; - case 'T': - log_set_print_timestamp(osmo_stderr_target, 1); - break; - case 'e': - log_set_log_level(osmo_stderr_target, atoi(optarg)); - break; - case 'r': - ccfg->restart_counter_file = optarg; - break; - case 'V': - print_version(1); - exit(EXIT_SUCCESS); - break; - default: - LOGP(DGTPHUB, LOGL_FATAL, "Invalid command line argument, abort.\n"); - exit(1); - break; - } - } -} - -int main(int argc, char **argv) -{ - int rc; - - struct cmdline_cfg _ccfg; - struct cmdline_cfg *ccfg = &_ccfg; - memset(ccfg, '\0', sizeof(*ccfg)); - ccfg->config_file = "./gtphub.conf"; - ccfg->restart_counter_file = "./gtphub_restart_count"; - - struct gtphub_cfg _cfg; - struct gtphub_cfg *cfg = &_cfg; - memset(cfg, '\0', sizeof(*cfg)); - - struct gtphub _hub; - struct gtphub *hub = &_hub; - - osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub"); - msgb_talloc_ctx_init(osmo_gtphub_ctx, 0); - vty_info.tall_ctx = osmo_gtphub_ctx; - - signal(SIGINT, &signal_handler); - signal(SIGTERM, &signal_handler); - signal(SIGABRT, &signal_handler); - signal(SIGUSR1, &signal_handler); - signal(SIGUSR2, &signal_handler); - osmo_init_ignore_signals(); - - osmo_init_logging2(osmo_gtphub_ctx, >phub_log_info); - - vty_info.copyright = gtphub_copyright; - vty_init(&vty_info); - logging_vty_add_cmds(); - osmo_talloc_vty_add_cmds(); - gtphub_vty_init(hub, cfg); - - rate_ctr_init(osmo_gtphub_ctx); - - handle_options(ccfg, argc, argv); - - rc = gtphub_cfg_read(cfg, ccfg->config_file); - if (rc < 0) { - LOGP(DGTPHUB, LOGL_FATAL, "Cannot parse config file '%s'\n", - ccfg->config_file); - exit(2); - } - - /* start telnet after reading config for vty_get_bind_addr() */ - rc = telnet_init_dynif(osmo_gtphub_ctx, 0, vty_get_bind_addr(), - OSMO_VTY_PORT_GTPHUB); - if (rc < 0) - exit(1); - - if (gtphub_start(hub, cfg, - next_restart_count(ccfg->restart_counter_file)) - != 0) - return -1; - - log_cfg(cfg); - - if (ccfg->daemonize) { - rc = osmo_daemonize(); - if (rc < 0) { - LOGP(DGTPHUB, LOGL_FATAL, "Error during daemonize"); - exit(1); - } - } - - while (1) { - rc = osmo_select_main(0); - if (rc < 0) - exit(3); - } - - /* not reached */ - exit(0); -} diff --git a/src/gprs/gtphub_sock.c b/src/gprs/gtphub_sock.c deleted file mode 100644 index 1acd5a624..000000000 --- a/src/gprs/gtphub_sock.c +++ /dev/null @@ -1,60 +0,0 @@ -/* GTP Hub Implementation */ - -/* (C) 2015 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * gtphub_sock.c. - * - * This file is kept separate so that these functions can be wrapped for - * gtphub_test.c. When a function and its callers are in the same compilational - * unit, the wrappability may be optimized away. - * - * Author: Neels Hofmeyr - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see . - */ - -#include -#include - -/* Convenience makro, note: only within this C file. */ -#define LOG(level, fmt, args...) \ - LOGP(DGTPHUB, level, fmt, ##args) - -int gtphub_write(const struct osmo_fd *to, - const struct osmo_sockaddr *to_addr, - const uint8_t *buf, size_t buf_len) -{ - errno = 0; - ssize_t sent = sendto(to->fd, buf, buf_len, 0, - (struct sockaddr*)&to_addr->a, to_addr->l); - LOG(LOGL_DEBUG, "to %s\n", osmo_sockaddr_to_str(to_addr)); - - if (sent == -1) { - LOG(LOGL_ERROR, "error: %s\n", strerror(errno)); - return -EINVAL; - } - - if (sent != buf_len) - LOG(LOGL_ERROR, "sent(%d) != data_len(%d)\n", - (int)sent, (int)buf_len); - else - LOG(LOGL_DEBUG, "Sent %d: %s%s\n", - (int)sent, - osmo_hexdump(buf, sent > 1000? 1000 : sent), - sent > 1000 ? "..." : ""); - - return 0; -} - diff --git a/src/gprs/gtphub_vty.c b/src/gprs/gtphub_vty.c deleted file mode 100644 index abc08fd69..000000000 --- a/src/gprs/gtphub_vty.c +++ /dev/null @@ -1,613 +0,0 @@ -/* (C) 2015 by sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * Author: Neels Hofmeyr - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU Affero General Public License as published by - * the Free Software Foundation; either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU Affero General Public License for more details. - * - * You should have received a copy of the GNU Affero General Public License - * along with this program. If not, see . - * - */ - -#include -#include - -#include -#include -#include -#include - -#include -#include -#include - -#include -#include - -/* TODO split GRX ares from sgsn into a separate struct and allow use without - * globals. */ -#include -extern struct sgsn_instance *sgsn; -extern void *tall_sgsn_ctx; - -static struct gtphub *g_hub = 0; -static struct gtphub_cfg *g_cfg = 0; - -static struct cmd_node gtphub_node = { - GTPHUB_NODE, - "%s(config-gtphub)# ", - 1, -}; - -#define GTPH_DEFAULT_CONTROL_PORT 2123 -#define GTPH_DEFAULT_USER_PORT 2152 - -static void write_addrs(struct vty *vty, const char *name, - struct gtphub_cfg_addr *c, struct gtphub_cfg_addr *u) -{ - if ((c->port == GTPH_DEFAULT_CONTROL_PORT) - && (u->port == GTPH_DEFAULT_USER_PORT) - && (strcmp(c->addr_str, u->addr_str) == 0)) { - /* Default port numbers and same IP address: write "short" - * variant. */ - vty_out(vty, " %s %s%s", - name, - c->addr_str, - VTY_NEWLINE); - return; - } - - vty_out(vty, " %s ctrl %s %d user %s %d%s", - name, - c->addr_str, (int)c->port, - u->addr_str, (int)u->port, - VTY_NEWLINE); - - struct ares_addr_node *server; - for (server = sgsn->ares_servers; server; server = server->next) - vty_out(vty, " grx-dns-add %s%s", inet_ntoa(server->addr.addr4), VTY_NEWLINE); -} - -static int config_write_gtphub(struct vty *vty) -{ - vty_out(vty, "gtphub%s", VTY_NEWLINE); - - write_addrs(vty, "bind-to-sgsns", - &g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind, - &g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind); - - write_addrs(vty, "bind-to-ggsns", - &g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind, - &g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind); - - if (g_cfg->sgsn_use_sender) { - vty_out(vty, "sgsn-use-sender%s", VTY_NEWLINE); - } - - if (g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str) { - write_addrs(vty, "sgsn-proxy", - &g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL], - &g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER]); - } - - if (g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) { - write_addrs(vty, "ggsn-proxy", - &g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], - &g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER]); - } - - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub, cfg_gtphub_cmd, - "gtphub", - "Configure the GTP hub\n") -{ - vty->node = GTPHUB_NODE; - return CMD_SUCCESS; -} - -#define BIND_ARGS "ctrl ADDR <0-65535> user ADDR <0-65535>" -#define BIND_DOCS \ - "Set GTP-C bind\n" \ - "GTP-C local IP address (v4 or v6)\n" \ - "GTP-C local port\n" \ - "Set GTP-U bind\n" \ - "GTP-U local IP address (v4 or v6)\n" \ - "GTP-U local port\n" - - -DEFUN(cfg_gtphub_bind_to_sgsns_short, cfg_gtphub_bind_to_sgsns_short_cmd, - "bind-to-sgsns ADDR", - "GTP Hub Parameters\n" - "Set the local bind address to listen for SGSNs, for both GTP-C and GTP-U\n" - "Local IP address (v4 or v6)\n" - ) -{ - int i; - for_each_plane(i) - g_cfg->to_gsns[GTPH_SIDE_SGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; - g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT; - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_bind_to_ggsns_short, cfg_gtphub_bind_to_ggsns_short_cmd, - "bind-to-ggsns ADDR", - "GTP Hub Parameters\n" - "Set the local bind address to listen for GGSNs, for both GTP-C and GTP-U\n" - "Local IP address (v4 or v6)\n" - ) -{ - int i; - for_each_plane(i) - g_cfg->to_gsns[GTPH_SIDE_GGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; - g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT; - return CMD_SUCCESS; -} - - -static int handle_binds(struct gtphub_cfg_bind *b, const char **argv) -{ - b[GTPH_PLANE_CTRL].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - b[GTPH_PLANE_CTRL].bind.port = atoi(argv[1]); - b[GTPH_PLANE_USER].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[2]); - b[GTPH_PLANE_USER].bind.port = atoi(argv[3]); - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_bind_to_sgsns, cfg_gtphub_bind_to_sgsns_cmd, - "bind-to-sgsns " BIND_ARGS, - "GTP Hub Parameters\n" - "Set the local bind addresses and ports to listen for SGSNs\n" - BIND_DOCS - ) -{ - return handle_binds(g_cfg->to_gsns[GTPH_SIDE_SGSN], argv); -} - -DEFUN(cfg_gtphub_bind_to_ggsns, cfg_gtphub_bind_to_ggsns_cmd, - "bind-to-ggsns " BIND_ARGS, - "GTP Hub Parameters\n" - "Set the local bind addresses and ports to listen for GGSNs\n" - BIND_DOCS - ) -{ - return handle_binds(g_cfg->to_gsns[GTPH_SIDE_GGSN], argv); -} - -DEFUN(cfg_gtphub_ggsn_proxy_short, cfg_gtphub_ggsn_proxy_short_cmd, - "ggsn-proxy ADDR", - "GTP Hub Parameters\n" - "Redirect all GGSN bound traffic to default ports on this address (another gtphub)\n" - "Remote IP address (v4 or v6)\n" - ) -{ - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT; - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_ggsn_proxy, cfg_gtphub_ggsn_proxy_cmd, - "ggsn-proxy " BIND_ARGS, - "GTP Hub Parameters\n" - "Redirect all GGSN bound traffic to these addresses and ports (another gtphub)\n" - BIND_DOCS - ) -{ - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]); - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); - g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = atoi(argv[3]); - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_sgsn_proxy_short, cfg_gtphub_sgsn_proxy_short_cmd, - "sgsn-proxy ADDR", - "GTP Hub Parameters\n" - "Redirect all SGSN bound traffic to default ports on this address (another gtphub)\n" - "Remote IP address (v4 or v6)\n" - ) -{ - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT; - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_sgsn_proxy, cfg_gtphub_sgsn_proxy_cmd, - "sgsn-proxy " BIND_ARGS, - "GTP Hub Parameters\n" - "Redirect all SGSN bound traffic to these addresses and ports (another gtphub)\n" - BIND_DOCS - ) -{ - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]); - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); - g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = atoi(argv[3]); - return CMD_SUCCESS; -} - - -#define SGSN_USE_SENDER_STR \ - "Ignore SGSN's Address IEs, use sender address and port (useful over NAT)\n" - -DEFUN(cfg_gtphub_sgsn_use_sender, - cfg_gtphub_sgsn_use_sender_cmd, - "sgsn-use-sender", - SGSN_USE_SENDER_STR) -{ - g_cfg->sgsn_use_sender = 1; - return CMD_SUCCESS; -} - -DEFUN(cfg_gtphub_no_sgsn_use_sender, - cfg_gtphub_no_sgsn_use_sender_cmd, - "no sgsn-use-sender", - NO_STR SGSN_USE_SENDER_STR) -{ - g_cfg->sgsn_use_sender = 0; - return CMD_SUCCESS; -} - - -/* Copied from sgsn_vty.h */ -DEFUN(cfg_grx_ggsn, cfg_grx_ggsn_cmd, - "grx-dns-add A.B.C.D", - "Add DNS server\nIPv4 address\n") -{ - struct ares_addr_node *node = talloc_zero(tall_sgsn_ctx, struct ares_addr_node); - node->family = AF_INET; - inet_aton(argv[0], &node->addr.addr4); - - node->next = sgsn->ares_servers; - sgsn->ares_servers = node; - return CMD_SUCCESS; -} - - -static void show_bind_stats_all(struct vty *vty) -{ - int plane_idx; - for_each_plane(plane_idx) { - vty_out(vty, "- %s Plane:%s", - gtphub_plane_idx_names[plane_idx], VTY_NEWLINE); - - int side_idx; - for_each_side(side_idx) { - struct gtphub_bind *b = &g_hub->to_gsns[side_idx][plane_idx]; - vty_out(vty, " - local addr to/from %ss: %s port %d%s", - gtphub_side_idx_names[side_idx], - gsn_addr_to_str(&b->local_addr), (int)b->local_port, - VTY_NEWLINE); - vty_out_rate_ctr_group(vty, " ", b->counters_io); - } - } -} - -static void show_tunnel_stats(struct vty *vty, struct gtphub_tunnel *tun) -{ - int plane_idx; - for_each_plane(plane_idx) { - vty_out(vty, "- %s Plane:%s", - gtphub_plane_idx_names[plane_idx], VTY_NEWLINE); - - int side_idx; - for_each_side(side_idx) { - struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; - vty_out(vty, " - to/from %s:%s", - gtphub_side_idx_names[side_idx], - VTY_NEWLINE); - vty_out_rate_ctr_group(vty, " ", te->counters_io); - } - } -} - -static void show_peer_summary(struct vty *vty, const char *prefix, - int side_idx, int plane_idx, - struct gtphub_peer *p, int with_io_stats) -{ - struct gtphub_peer_addr *pa; - int p2l = strlen(prefix) + 4 + 1; - char prefix2[p2l]; - memset(prefix2, ' ', p2l - 1); - prefix2[p2l - 1] = '\0'; - - if (with_io_stats) { - llist_for_each_entry(pa, &p->addresses, entry) { - vty_out(vty, "%s- %s %s %s%s", prefix, - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - gsn_addr_to_str(&pa->addr), - VTY_NEWLINE); - - - struct gtphub_peer_port *pp; - llist_for_each_entry(pp, &pa->ports, entry) { - vty_out(vty, "%s Port %" PRIu16 "%s", prefix, pp->port, VTY_NEWLINE); - vty_out_rate_ctr_group(vty, prefix2, pp->counters_io); - } - } - } else { - llist_for_each_entry(pa, &p->addresses, entry) { - vty_out(vty, "%s- %s %s %s", prefix, - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - gsn_addr_to_str(&pa->addr)); - struct gtphub_peer_port *pp; - llist_for_each_entry(pp, &pa->ports, entry) { - vty_out(vty, ":%" PRIu16, pp->port); - } - vty_out(vty, VTY_NEWLINE); - } - } -} - -static void show_peers_summary(struct vty *vty) -{ - int side_idx; - int plane_idx; - - int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}}; - - for_each_side(side_idx) { - for_each_plane(plane_idx) { - struct gtphub_peer *p; - llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) { - count[side_idx][plane_idx] ++; - } - } - } - - vty_out(vty, "Peers Count:%s", VTY_NEWLINE); - for_each_side_and_plane(side_idx, plane_idx) { - vty_out(vty, " %s %s peers: %d%s", - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - count[side_idx][plane_idx], - VTY_NEWLINE); - } -} - -static void show_peers_all(struct vty *vty, int with_io_stats) -{ - int side_idx; - int plane_idx; - - int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}}; - - vty_out(vty, "All Peers%s%s", - with_io_stats? " with I/O stats" : "", - VTY_NEWLINE); - for_each_side(side_idx) { - vty_out(vty, "- %s%s", gtphub_side_idx_names[side_idx], VTY_NEWLINE); - for_each_plane(plane_idx) { - struct gtphub_peer *p; - llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) { - count[side_idx][plane_idx] ++; - show_peer_summary(vty, " ", side_idx, plane_idx, p, with_io_stats); - } - } - } - for_each_side_and_plane(side_idx, plane_idx) { - vty_out(vty, "%s %s peers: %d%s", - gtphub_side_idx_names[side_idx], - gtphub_plane_idx_names[plane_idx], - count[side_idx][plane_idx], - VTY_NEWLINE); - } -} - - -static void show_tunnels_summary(struct vty *vty) -{ - time_t now = gtphub_now(); - - const int w = 36; - int max_expiry = g_hub->expire_slowly.expiry_in_seconds; - float seconds_per_step = ((float)max_expiry) / w; - - /* Print TEI mapping expiry in an ASCII histogram, like: - TEI map summary - Legend: '_'=0 '.'<=1% ':'<=2% '|'<=10% '#'>10% (10.0 m/step) - CTRL: 30 mappings, valid for 360m[# :. | . : . ]1m - USER: 30 mappings, valid for 360m[# :. | . : . ]1m - 4 TEI mappings in total, last expiry in 359.4 min - */ - vty_out(vty, - "Tunnels summary%s" - " Legend: ' '=0 '.'<=1%% ':'<=2%% '|'<=10%% '#'>10%% (%.1f m/step)%s", - VTY_NEWLINE, - seconds_per_step / 60., - VTY_NEWLINE); - - int last_expiry = 0; - - unsigned int count = 0; - - int histogram[w]; - memset(histogram, 0, sizeof(histogram)); - - struct gtphub_tunnel *t; - llist_for_each_entry(t, &g_hub->tunnels, entry) { - count ++; - int expiry = t->expiry_entry.expiry - now; - last_expiry = (last_expiry > expiry) ? last_expiry : expiry; - - int hi = ((float)expiry) / seconds_per_step; - if (hi < 0) - hi = 0; - if (hi > (w - 1)) - hi = w - 1; - histogram[hi] ++; - } - - vty_out(vty, - " %u tunnels, valid for %dm[", - count, max_expiry / 60); - - int i; - for (i = w - 1; i >= 0; i--) { - char c; - int val = histogram[i]; - int percent = 100. * val / count; - if (!val) - c = ' '; - else if (percent <= 1) - c = '.'; - else if (percent <= 2) - c = ':'; - else if (percent <= 10) - c = '|'; - else c = '#'; - vty_out(vty, "%c", c); - } - vty_out(vty, "]1m%s", VTY_NEWLINE); - - vty_out(vty, " last expiry in %.1f min%s", - ((float)last_expiry) / 60., - VTY_NEWLINE); -} - -static void show_tunnels_all(struct vty *vty, int with_io_stats) -{ - time_t now = gtphub_now(); - - vty_out(vty, "All tunnels%s:%s" - "Legend: TEI=: SGSN <-> GGSN (expiry in minutes), with each:%s" - " [/] (TEI C= U=)%s", - with_io_stats? "with I/O stats" : "", - VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE); - - unsigned int count = 0; - unsigned int incomplete = 0; - struct gtphub_tunnel *tun; - llist_for_each_entry(tun, &g_hub->tunnels, entry) { - vty_out(vty, - "%s (expiry in %dm)%s", - gtphub_tunnel_str(tun), - (int)((tun->expiry_entry.expiry - now) / 60), - VTY_NEWLINE); - count ++; - if (!gtphub_tunnel_complete(tun)) - incomplete ++; - if (with_io_stats) - show_tunnel_stats(vty, tun); - } - vty_out(vty, "Total: %u tunnels (of which %u incomplete)%s", - count, incomplete, VTY_NEWLINE); -} - -#define SHOW_GTPHUB_STRS SHOW_STR "Show info on running GTP hub\n" -#define SHOW_GTPHUB_PEERS_STRS SHOW_GTPHUB_STRS "Active peers\n" -#define SHOW_GTPHUB_TUNS_STRS SHOW_GTPHUB_STRS "Active tunnels\n" - -DEFUN(show_gtphub_peers_summary, show_gtphub_peers_summary_cmd, "show gtphub peers summary", - SHOW_GTPHUB_PEERS_STRS "Summary of all peers\n") -{ - show_peers_summary(vty); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub_peers_list, show_gtphub_peers_list_cmd, "show gtphub peers list", - SHOW_GTPHUB_PEERS_STRS "List all peers\n") -{ - show_peers_all(vty, 0); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub_peers_stats, show_gtphub_peers_stats_cmd, "show gtphub peers stats", - SHOW_GTPHUB_PEERS_STRS "List all peers with I/O stats\n") -{ - show_peers_all(vty, 1); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub_tunnels_summary, show_gtphub_tunnels_summary_cmd, "show gtphub tunnels summary", - SHOW_GTPHUB_TUNS_STRS "Summary of all tunnels\n") -{ - show_tunnels_summary(vty); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub_tunnels_list, show_gtphub_tunnels_list_cmd, "show gtphub tunnels list", - SHOW_GTPHUB_TUNS_STRS "List all tunnels\n") -{ - show_tunnels_all(vty, 0); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub_tunnels_stats, show_gtphub_tunnels_stats_cmd, "show gtphub tunnels stats", - SHOW_GTPHUB_TUNS_STRS "List all tunnels with I/O stats\n") -{ - show_tunnels_all(vty, 1); - return CMD_SUCCESS; -} - -DEFUN(show_gtphub, show_gtphub_cmd, "show gtphub all", - SHOW_GTPHUB_STRS "Summarize everything about the GTP hub\n") -{ - show_bind_stats_all(vty); - show_peers_summary(vty); - show_tunnels_summary(vty); - return CMD_SUCCESS; -} - - -int gtphub_vty_init(struct gtphub *global_hub, struct gtphub_cfg *global_cfg) -{ - g_hub = global_hub; - g_cfg = global_cfg; - - install_element_ve(&show_gtphub_cmd); - install_element_ve(&show_gtphub_peers_summary_cmd); - install_element_ve(&show_gtphub_peers_list_cmd); - install_element_ve(&show_gtphub_peers_stats_cmd); - install_element_ve(&show_gtphub_tunnels_summary_cmd); - install_element_ve(&show_gtphub_tunnels_list_cmd); - install_element_ve(&show_gtphub_tunnels_stats_cmd); - - install_element(CONFIG_NODE, &cfg_gtphub_cmd); - install_node(>phub_node, config_write_gtphub); - - install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_short_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_short_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_short_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_short_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_use_sender_cmd); - install_element(GTPHUB_NODE, &cfg_gtphub_no_sgsn_use_sender_cmd); - install_element(GTPHUB_NODE, &cfg_grx_ggsn_cmd); - - return 0; -} - -int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file) -{ - int rc; - - rc = vty_read_config_file(config_file, NULL); - if (rc < 0) { - fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); - return rc; - } - - return 0; -} diff --git a/src/gtphub/Makefile.am b/src/gtphub/Makefile.am new file mode 100644 index 000000000..a242a0584 --- /dev/null +++ b/src/gtphub/Makefile.am @@ -0,0 +1,45 @@ +AM_CPPFLAGS = \ + $(all_includes) \ + -I$(top_srcdir)/include \ + -I$(top_builddir) \ + $(NULL) + +AM_CFLAGS = \ + -Wall \ + -fno-strict-aliasing \ + $(LIBOSMOCORE_CFLAGS) \ + $(LIBOSMOGSM_CFLAGS) \ + $(LIBOSMOVTY_CFLAGS) \ + $(LIBOSMOGSUPCLIENT_CFLAGS) \ + $(COVERAGE_CFLAGS) \ + $(LIBGTP_CFLAGS) \ + $(NULL) +if BUILD_IU +AM_CFLAGS += \ + $(LIBASN1C_CFLAGS) \ + $(LIBOSMOSIGTRAN_CFLAGS) \ + $(LIBOSMORANAP_CFLAGS) \ + $(NULL) +endif + +bin_PROGRAMS = osmo-gtphub + +osmo_gtphub_SOURCES = \ + gtphub_main.c \ + gtphub.c \ + gtphub_sock.c \ + gtphub_ares.c \ + gtphub_vty.c \ + $(NULL) + +osmo_gtphub_LDADD = \ + $(top_builddir)/src/gprs/sgsn_ares.o \ + $(top_builddir)/src/gprs/gprs_utils.o \ + $(LIBOSMOCORE_LIBS) \ + $(LIBOSMOGSM_LIBS) \ + $(LIBOSMOVTY_LIBS) \ + $(LIBCARES_LIBS) \ + $(LIBGTP_LIBS) \ + $(LIBOSMOSIGTRAN_LIBS) \ + -lrt \ + $(NULL) diff --git a/src/gtphub/gtphub.c b/src/gtphub/gtphub.c new file mode 100644 index 000000000..ca5857b39 --- /dev/null +++ b/src/gtphub/gtphub.c @@ -0,0 +1,2960 @@ +/* GTP Hub Implementation */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Neels Hofmeyr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include +#include +#include + +#include +#include +#include +#include +#include + +#include + + +static const int GTPH_GC_TICK_SECONDS = 1; + +void *osmo_gtphub_ctx; + +/* Convenience makro, note: only within this C file. */ +#define LOG(level, fmt, args...) \ + LOGP(DGTPHUB, level, fmt, ##args) + +#define ZERO_STRUCT(struct_pointer) memset(struct_pointer, '\0', \ + sizeof(*(struct_pointer))) + +/* TODO move this to osmocom/core/select.h ? */ +typedef int (*osmo_fd_cb_t)(struct osmo_fd *fd, unsigned int what); + +/* TODO move this to osmocom/core/linuxlist.h ? */ +#define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next) +#define llist_first(head, type, entry) \ + llist_entry(__llist_first(head), type, entry) + +#define __llist_last(head) (((head)->next == (head)) ? NULL : (head)->prev) +#define llist_last(head, type, entry) \ + llist_entry(__llist_last(head), type, entry) + +/* TODO move GTP header stuff to openggsn/gtp/ ? See gtp_decaps*() */ + +enum gtp_rc { + GTP_RC_UNKNOWN = 0, + GTP_RC_TINY = 1, /* no IEs (like ping/pong) */ + GTP_RC_PDU_C = 2, /* a real packet with IEs */ + GTP_RC_PDU_U = 3, /* a real packet with User data */ + + GTP_RC_TOOSHORT = -1, + GTP_RC_UNSUPPORTED_VERSION = -2, + GTP_RC_INVALID_IE = -3, +}; + +struct gtp_packet_desc { + union gtp_packet *data; + int data_len; + int header_len; + int version; + uint8_t type; + uint16_t seq; + uint32_t header_tei_rx; + uint32_t header_tei; + int rc; /* enum gtp_rc */ + unsigned int plane_idx; + unsigned int side_idx; + struct gtphub_tunnel *tun; + time_t timestamp; + union gtpie_member *ie[GTPIE_SIZE]; +}; + +struct pending_delete { + struct llist_head entry; + struct expiring_item expiry_entry; + + struct gtphub_tunnel *tun; + uint8_t teardown_ind; + uint8_t nsapi; +}; + + +/* counters */ + +enum gtphub_counters_io { + GTPH_CTR_PKTS_IN = 0, + GTPH_CTR_PKTS_OUT, + GTPH_CTR_BYTES_IN, + GTPH_CTR_BYTES_OUT +}; + +static const struct rate_ctr_desc gtphub_counters_io_desc[] = { + { "packets.in", "Packets ( In)" }, + { "packets.out", "Packets (Out)" }, + { "bytes.in", "Bytes ( In)" }, + { "bytes.out", "Bytes (Out)" }, +}; + +static const struct rate_ctr_group_desc gtphub_ctrg_io_desc = { + .group_name_prefix = "gtphub:bind", + .group_description = "I/O Statistics", + .num_ctr = ARRAY_SIZE(gtphub_counters_io_desc), + .ctr_desc = gtphub_counters_io_desc, + .class_id = OSMO_STATS_CLASS_GLOBAL, +}; + + +/* support */ + +static const char *gtp_type_str(uint8_t type) +{ + switch (type) { + case 1: + return " (Echo Request)"; + case 2: + return " (Echo Response)"; + case 16: + return " (Create PDP Ctx Request)"; + case 17: + return " (Create PDP Ctx Response)"; + case 18: + return " (Update PDP Ctx Request)"; + case 19: + return " (Update PDP Ctx Response)"; + case 20: + return " (Delete PDP Ctx Request)"; + case 21: + return " (Delete PDP Ctx Response)"; + case 255: + return " (User Data)"; + default: + return ""; + } +} + +void gsn_addr_copy(struct gsn_addr *gsna, const struct gsn_addr *src) +{ + *gsna = *src; +} + +int gsn_addr_from_sockaddr(struct gsn_addr *gsna, uint16_t *port, + const struct osmo_sockaddr *sa) +{ + char addr_str[256]; + char port_str[6]; + + if (osmo_sockaddr_to_strs(addr_str, sizeof(addr_str), + port_str, sizeof(port_str), + sa, (NI_NUMERICHOST | NI_NUMERICSERV)) + != 0) { + return -1; + } + + if (port) + *port = atoi(port_str); + + return gsn_addr_from_str(gsna, addr_str); +} + +int gsn_addr_from_str(struct gsn_addr *gsna, const char *numeric_addr_str) +{ + if ((!gsna) || (!numeric_addr_str)) + return -1; + + int af = AF_INET; + gsna->len = 4; + const char *pos = numeric_addr_str; + for (; *pos; pos++) { + if (*pos == ':') { + af = AF_INET6; + gsna->len = 16; + break; + } + } + + int rc = inet_pton(af, numeric_addr_str, gsna->buf); + if (rc != 1) { + LOG(LOGL_ERROR, "Cannot resolve numeric address: '%s'\n", + numeric_addr_str); + return -1; + } + return 0; +} + +const char *gsn_addr_to_str(const struct gsn_addr *gsna) +{ + static char buf[INET6_ADDRSTRLEN + 1]; + return gsn_addr_to_strb(gsna, buf, sizeof(buf)); +} + +const char *gsn_addr_to_strb(const struct gsn_addr *gsna, + char *strbuf, + int strbuf_len) +{ + int af; + switch (gsna->len) { + case 4: + af = AF_INET; + break; + case 16: + af = AF_INET6; + break; + default: + return NULL; + } + + const char *r = inet_ntop(af, gsna->buf, strbuf, strbuf_len); + if (!r) { + LOG(LOGL_ERROR, "Cannot convert gsn_addr to string:" + " %s: len=%d, buf=%s\n", + strerror(errno), + (int)gsna->len, + osmo_hexdump(gsna->buf, sizeof(gsna->buf))); + } + return r; +} + +int gsn_addr_same(const struct gsn_addr *a, const struct gsn_addr *b) +{ + if (a == b) + return 1; + if ((!a) || (!b)) + return 0; + if (a->len != b->len) + return 0; + return (memcmp(a->buf, b->buf, a->len) == 0)? 1 : 0; +} + +static int gsn_addr_get(struct gsn_addr *gsna, const struct gtp_packet_desc *p, + int idx) +{ + if (p->rc != GTP_RC_PDU_C) + return -1; + + unsigned int len; + /* gtpie.h fails to declare gtpie_gettlv()'s first arg as const. */ + if (gtpie_gettlv((union gtpie_member**)p->ie, GTPIE_GSN_ADDR, idx, + &len, gsna->buf, sizeof(gsna->buf)) + != 0) + return -1; + gsna->len = len; + return 0; +} + +static int gsn_addr_put(const struct gsn_addr *gsna, struct gtp_packet_desc *p, + int idx) +{ + if (p->rc != GTP_RC_PDU_C) + return -1; + + int ie_idx; + ie_idx = gtpie_getie(p->ie, GTPIE_GSN_ADDR, idx); + + if (ie_idx < 0) + return -1; + + struct gtpie_tlv *ie = &p->ie[ie_idx]->tlv; + int ie_l = ntoh16(ie->l); + if (ie_l != gsna->len) { + LOG(LOGL_ERROR, "Not implemented:" + " replace an IE address of different size:" + " replace %d with %d\n", (int)ie_l, (int)gsna->len); + return -1; + } + + memcpy(ie->v, gsna->buf, (int)ie_l); + return 0; +} + +/* Validate GTP version 0 data; analogous to validate_gtp1_header(), see there. + */ +void validate_gtp0_header(struct gtp_packet_desc *p) +{ + const struct gtp0_header *pheader = &(p->data->gtp0.h); + p->rc = GTP_RC_UNKNOWN; + p->header_len = 0; + + OSMO_ASSERT(p->data_len >= 1); + OSMO_ASSERT(p->version == 0); + + if (p->data_len < GTP0_HEADER_SIZE) { + LOG(LOGL_ERROR, "GTP0 packet too short: %d\n", p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + p->type = ntoh8(pheader->type); + p->seq = ntoh16(pheader->seq); + p->header_tei_rx = 0; /* TODO */ + p->header_tei = p->header_tei_rx; + + if (p->data_len == GTP0_HEADER_SIZE) { + p->rc = GTP_RC_TINY; + p->header_len = GTP0_HEADER_SIZE; + return; + } + + /* Check packet length field versus length of packet */ + if (p->data_len != (ntoh16(pheader->length) + GTP0_HEADER_SIZE)) { + LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" + " match actual length (%d)\n", + GTP0_HEADER_SIZE, (int)ntoh16(pheader->length), + p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + LOG(LOGL_DEBUG, "GTP v0 TID = %" PRIu64 "\n", pheader->tid); + p->header_len = GTP0_HEADER_SIZE; + p->rc = GTP_RC_PDU_C; +} + +/* Validate GTP version 1 data, and update p->rc with the result, as well as + * p->header_len in case of a valid header. */ +void validate_gtp1_header(struct gtp_packet_desc *p) +{ + const struct gtp1_header_long *pheader = &(p->data->gtp1l.h); + p->rc = GTP_RC_UNKNOWN; + p->header_len = 0; + + OSMO_ASSERT(p->data_len >= 1); + OSMO_ASSERT(p->version == 1); + + if ((p->data_len < GTP1_HEADER_SIZE_LONG) + && (p->data_len != GTP1_HEADER_SIZE_SHORT)){ + LOG(LOGL_ERROR, "GTP packet too short: %d\n", p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + p->type = ntoh8(pheader->type); + p->header_tei_rx = ntoh32(pheader->tei); + p->header_tei = p->header_tei_rx; + p->seq = ntoh16(pheader->seq); + + LOG(LOGL_DEBUG, "| GTPv1\n"); + LOG(LOGL_DEBUG, "| type = %" PRIu8 " 0x%02" PRIx8 "\n", p->type, p->type); + LOG(LOGL_DEBUG, "| length = %" PRIu16 " 0x%04" PRIx16 "\n", ntoh16(pheader->length), ntoh16(pheader->length)); + LOG(LOGL_DEBUG, "| TEI = %" PRIu32 " 0x%08" PRIx32 "\n", p->header_tei_rx, p->header_tei_rx); + LOG(LOGL_DEBUG, "| seq = %" PRIu16 " 0x%04" PRIx16 "\n", p->seq, p->seq); + LOG(LOGL_DEBUG, "| npdu = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->npdu, pheader->npdu); + LOG(LOGL_DEBUG, "| next = %" PRIu8 " 0x%02" PRIx8 "\n", pheader->next, pheader->next); + + if (p->data_len <= GTP1_HEADER_SIZE_LONG) { + p->rc = GTP_RC_TINY; + p->header_len = GTP1_HEADER_SIZE_SHORT; + return; + } + + /* Check packet length field versus length of packet */ + int announced_len = ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT; + if (p->data_len != announced_len) { + LOG(LOGL_ERROR, "GTP packet length field (%d + %d) does not" + " match actual length (%d)\n", + GTP1_HEADER_SIZE_SHORT, (int)ntoh16(pheader->length), + p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + p->rc = GTP_RC_PDU_C; + p->header_len = GTP1_HEADER_SIZE_LONG; +} + +/* Examine whether p->data of size p->data_len has a valid GTP header. Set + * p->version, p->rc and p->header_len. On error, p->rc <= 0 (see enum + * gtp_rc). p->data must point at a buffer with p->data_len set. */ +void validate_gtp_header(struct gtp_packet_desc *p) +{ + p->rc = GTP_RC_UNKNOWN; + + /* Need at least 1 byte in order to check version */ + if (p->data_len < 1) { + LOG(LOGL_ERROR, "Discarding packet - too small: %d\n", + p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + p->version = p->data->flags >> 5; + + switch (p->version) { + case 0: + validate_gtp0_header(p); + break; + case 1: + validate_gtp1_header(p); + break; + default: + LOG(LOGL_ERROR, "Unsupported GTP version: %d\n", p->version); + p->rc = GTP_RC_UNSUPPORTED_VERSION; + break; + } +} + + +/* Return the value of the i'th IMSI IEI by copying to *imsi. + * The first IEI is reached by passing i = 0. + * imsi must point at allocated space of (at least) 8 bytes. + * Return 1 on success, or 0 if not found. */ +static int get_ie_imsi(union gtpie_member *ie[], int i, uint8_t *imsi) +{ + return gtpie_gettv0(ie, GTPIE_IMSI, i, imsi, 8) == 0; +} + +/* Analogous to get_ie_imsi(). nsapi must point at a single uint8_t. */ +static int get_ie_nsapi(union gtpie_member *ie[], int i, uint8_t *nsapi) +{ + return gtpie_gettv1(ie, GTPIE_NSAPI, i, nsapi) == 0; +} + +static char imsi_digit_to_char(uint8_t nibble) +{ + nibble &= 0x0f; + if (nibble > 9) + return (nibble == 0x0f) ? '\0' : '?'; + return '0' + nibble; +} + +/* Return a human readable IMSI string, in a static buffer. + * imsi must point at 8 octets of IMSI IE encoded IMSI data. */ +static int imsi_to_str(uint8_t *imsi, const char **imsi_str) +{ + static char str[17]; + int i; + + for (i = 0; i < 8; i++) { + char c; + c = imsi_digit_to_char(imsi[i]); + if (c == '?') + return -1; + str[2*i] = c; + + c = imsi_digit_to_char(imsi[i] >> 4); + if (c == '?') + return -1; + str[2*i + 1] = c; + } + str[16] = '\0'; + *imsi_str = str; + return 1; +} + +/* Return 0 if not present, 1 if present and decoded successfully, -1 if + * present but cannot be decoded. */ +static int get_ie_imsi_str(union gtpie_member *ie[], int i, + const char **imsi_str) +{ + uint8_t imsi_buf[8]; + if (!get_ie_imsi(ie, i, imsi_buf)) + return 0; + return imsi_to_str(imsi_buf, imsi_str); +} + +/* Return 0 if not present, 1 if present and decoded successfully, -1 if + * present but cannot be decoded. */ +static int get_ie_apn_str(union gtpie_member *ie[], const char **apn_str) +{ + static char apn_buf[GSM_APN_LENGTH]; + unsigned int len; + if (gtpie_gettlv(ie, GTPIE_APN, 0, + &len, apn_buf, sizeof(apn_buf)) != 0) + return 0; + + if (len < 2) { + LOG(LOGL_ERROR, "APN IE: invalid length: %d\n", + (int)len); + return -1; + } + + if (len > (sizeof(apn_buf) - 1)) + len = sizeof(apn_buf) - 1; + apn_buf[len] = '\0'; + + *apn_str = osmo_apn_to_str(apn_buf, (uint8_t*)apn_buf, len); + if (!(*apn_str)) { + LOG(LOGL_ERROR, "APN IE: present but cannot be decoded: %s\n", + osmo_hexdump((uint8_t*)apn_buf, len)); + return -1; + } + return 1; +} + + +/* Validate header, and index information elements. Write decoded packet + * information to *res. res->data will point at the given data buffer. On + * error, p->rc is set <= 0 (see enum gtp_rc). */ +static void gtp_decode(const uint8_t *data, int data_len, + unsigned int from_side_idx, + unsigned int from_plane_idx, + struct gtp_packet_desc *res, + time_t now) +{ + ZERO_STRUCT(res); + res->data = (union gtp_packet*)data; + res->data_len = data_len; + res->side_idx = from_side_idx; + res->plane_idx = from_plane_idx; + res->timestamp = now; + + validate_gtp_header(res); + + if (res->rc <= 0) + return; + + LOG(LOGL_DEBUG, "Valid GTP header (v%d)\n", res->version); + + if (from_plane_idx == GTPH_PLANE_USER) { + res->rc = GTP_RC_PDU_U; + return; + } + + if (res->rc != GTP_RC_PDU_C) { + LOG(LOGL_DEBUG, "no IEs in this GTP packet\n"); + return; + } + + if (gtpie_decaps(res->ie, res->version, + (void*)(data + res->header_len), + res->data_len - res->header_len) != 0) { + res->rc = GTP_RC_INVALID_IE; + LOG(LOGL_ERROR, "INVALID: cannot decode IEs." + " Dropping GTP packet%s.\n", + gtp_type_str(res->type) + ); + return; + } + +#if 1 + /* TODO if () + (waiting for a commit from jerlbeck) */ + int i; + + for (i = 0; i < 10; i++) { + const char *imsi; + if (get_ie_imsi_str(res->ie, i, &imsi) < 1) + break; + LOG(LOGL_DEBUG, "| IMSI %s\n", imsi); + } + + for (i = 0; i < 10; i++) { + uint8_t nsapi; + if (!get_ie_nsapi(res->ie, i, &nsapi)) + break; + LOG(LOGL_DEBUG, "| NSAPI %d\n", (int)nsapi); + } + + for (i = 0; i < 2; i++) { + struct gsn_addr addr; + if (gsn_addr_get(&addr, res, i) == 0) + LOG(LOGL_DEBUG, "| addr %s\n", gsn_addr_to_str(&addr)); + } + + for (i = 0; i < 10; i++) { + uint32_t tei; + if (gtpie_gettv4(res->ie, GTPIE_TEI_DI, i, &tei) != 0) + break; + LOG(LOGL_DEBUG, "| TEI DI (USER) %" PRIu32 " 0x%08" PRIx32 "\n", + tei, tei); + } + + for (i = 0; i < 10; i++) { + uint32_t tei; + if (gtpie_gettv4(res->ie, GTPIE_TEI_C, i, &tei) != 0) + break; + LOG(LOGL_DEBUG, "| TEI (CTRL) %" PRIu32 " 0x%08" PRIx32 "\n", + tei, tei); + } +#endif +} + + +/* expiry */ + +void expiry_init(struct expiry *exq, int expiry_in_seconds) +{ + ZERO_STRUCT(exq); + exq->expiry_in_seconds = expiry_in_seconds; + INIT_LLIST_HEAD(&exq->items); +} + +void expiry_add(struct expiry *exq, struct expiring_item *item, time_t now) +{ + item->expiry = now + exq->expiry_in_seconds; + + OSMO_ASSERT(llist_empty(&exq->items) + || (item->expiry + >= llist_last(&exq->items, struct expiring_item, entry)->expiry)); + + /* Add/move to the tail to always sort by expiry, ascending. */ + llist_del(&item->entry); + llist_add_tail(&item->entry, &exq->items); +} + +int expiry_tick(struct expiry *exq, time_t now) +{ + int expired = 0; + struct expiring_item *m, *n; + llist_for_each_entry_safe(m, n, &exq->items, entry) { + if (m->expiry <= now) { + expiring_item_del(m); + expired ++; + } else { + /* The items are added sorted by expiry. So when we hit + * an unexpired entry, only more unexpired ones will + * follow. */ + break; + } + } + return expired; +} + +void expiry_clear(struct expiry *exq) +{ + struct expiring_item *m, *n; + llist_for_each_entry_safe(m, n, &exq->items, entry) { + expiring_item_del(m); + } +} + +void expiring_item_init(struct expiring_item *item) +{ + ZERO_STRUCT(item); + INIT_LLIST_HEAD(&item->entry); +} + +void expiring_item_del(struct expiring_item *item) +{ + OSMO_ASSERT(item); + llist_del(&item->entry); + INIT_LLIST_HEAD(&item->entry); + if (item->del_cb) { + /* avoid loops */ + del_cb_t del_cb = item->del_cb; + item->del_cb = 0; + (del_cb)(item); + } +} + + +/* nr_map, nr_pool */ + +void nr_pool_init(struct nr_pool *pool, nr_t nr_min, nr_t nr_max) +{ + *pool = (struct nr_pool){ + .nr_min = nr_min, + .nr_max = nr_max, + .last_nr = nr_max + }; +} + +nr_t nr_pool_next(struct nr_pool *pool) +{ + if (pool->last_nr >= pool->nr_max) + pool->last_nr = pool->nr_min; + else + pool->last_nr ++; + + return pool->last_nr; +} + +void nr_map_init(struct nr_map *map, struct nr_pool *pool, + struct expiry *exq) +{ + ZERO_STRUCT(map); + map->pool = pool; + map->add_items_to_expiry = exq; + INIT_LLIST_HEAD(&map->mappings); +} + +void nr_mapping_init(struct nr_mapping *m) +{ + ZERO_STRUCT(m); + INIT_LLIST_HEAD(&m->entry); + expiring_item_init(&m->expiry_entry); +} + +void nr_map_add(struct nr_map *map, struct nr_mapping *mapping, time_t now) +{ + /* Generate a mapped number */ + mapping->repl = nr_pool_next(map->pool); + + /* Add to the tail to always yield a list sorted by expiry, in + * ascending order. */ + llist_add_tail(&mapping->entry, &map->mappings); + nr_map_refresh(map, mapping, now); +} + +void nr_map_refresh(struct nr_map *map, struct nr_mapping *mapping, time_t now) +{ + if (!map->add_items_to_expiry) + return; + expiry_add(map->add_items_to_expiry, + &mapping->expiry_entry, + now); +} + +void nr_map_clear(struct nr_map *map) +{ + struct nr_mapping *m; + struct nr_mapping *n; + llist_for_each_entry_safe(m, n, &map->mappings, entry) { + nr_mapping_del(m); + } +} + +int nr_map_empty(const struct nr_map *map) +{ + return llist_empty(&map->mappings); +} + +struct nr_mapping *nr_map_get(const struct nr_map *map, + void *origin, nr_t nr_orig) +{ + struct nr_mapping *mapping; + llist_for_each_entry(mapping, &map->mappings, entry) { + if ((mapping->origin == origin) + && (mapping->orig == nr_orig)) + return mapping; + } + /* Not found. */ + return NULL; +} + +struct nr_mapping *nr_map_get_inv(const struct nr_map *map, nr_t nr_repl) +{ + struct nr_mapping *mapping; + llist_for_each_entry(mapping, &map->mappings, entry) { + if (mapping->repl == nr_repl) { + return mapping; + } + } + /* Not found. */ + return NULL; +} + +void nr_mapping_del(struct nr_mapping *mapping) +{ + OSMO_ASSERT(mapping); + llist_del(&mapping->entry); + INIT_LLIST_HEAD(&mapping->entry); + expiring_item_del(&mapping->expiry_entry); +} + + +/* gtphub */ + +const char* const gtphub_plane_idx_names[GTPH_PLANE_N] = { + "CTRL", + "USER", +}; + +const uint16_t gtphub_plane_idx_default_port[GTPH_PLANE_N] = { + 2123, + 2152, +}; + +const char* const gtphub_side_idx_names[GTPH_SIDE_N] = { + "SGSN", + "GGSN", +}; + +time_t gtphub_now(void) +{ + struct timespec now_tp; + OSMO_ASSERT(osmo_clock_gettime(CLOCK_MONOTONIC, &now_tp) >= 0); + return now_tp.tv_sec; +} + +/* Remove a gtphub_peer from its list and free it. */ +static void gtphub_peer_del(struct gtphub_peer *peer) +{ + OSMO_ASSERT(llist_empty(&peer->addresses)); + nr_map_clear(&peer->seq_map); + llist_del(&peer->entry); + talloc_free(peer); +} + +static void gtphub_peer_addr_del(struct gtphub_peer_addr *pa) +{ + OSMO_ASSERT(llist_empty(&pa->ports)); + llist_del(&pa->entry); + talloc_free(pa); +} + +static void gtphub_peer_port_del(struct gtphub_peer_port *pp) +{ + OSMO_ASSERT(pp->ref_count == 0); + llist_del(&pp->entry); + rate_ctr_group_free(pp->counters_io); + talloc_free(pp); +} + +/* From the information in the gtp_packet_desc, return the address of a GGSN. + * Return -1 on error. */ +static int gtphub_resolve_ggsn(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port **pp); + +/* See gtphub_ext.c (wrapped by unit test) */ +struct gtphub_peer_port *gtphub_resolve_ggsn_addr(struct gtphub *hub, + const char *imsi_str, + const char *apn_ni_str); +int gtphub_ares_init(struct gtphub *hub); + +static void gtphub_zero(struct gtphub *hub) +{ + ZERO_STRUCT(hub); + INIT_LLIST_HEAD(&hub->ggsn_lookups); + INIT_LLIST_HEAD(&hub->resolved_ggsns); +} + +static int gtphub_sock_init(struct osmo_fd *ofd, + const struct gtphub_cfg_addr *addr, + osmo_fd_cb_t cb, + void *data, + int ofd_id) +{ + if (!addr->addr_str) { + LOG(LOGL_FATAL, "Cannot bind: empty address.\n"); + return -1; + } + if (!addr->port) { + LOG(LOGL_FATAL, "Cannot bind: zero port not permitted.\n"); + return -1; + } + + ofd->when = BSC_FD_READ; + ofd->cb = cb; + ofd->data = data; + ofd->priv_nr = ofd_id; + + int rc; + rc = osmo_sock_init_ofd(ofd, + AF_UNSPEC, SOCK_DGRAM, IPPROTO_UDP, + addr->addr_str, addr->port, + OSMO_SOCK_F_BIND); + if (rc < 1) { + LOG(LOGL_FATAL, "Cannot bind to %s port %d (rc %d)\n", + addr->addr_str, (int)addr->port, rc); + return -1; + } + + return 0; +} + +static void gtphub_sock_close(struct osmo_fd *ofd) +{ + close(ofd->fd); + osmo_fd_unregister(ofd); + ofd->cb = NULL; +} + +static void gtphub_bind_init(struct gtphub_bind *b, uint32_t idx) +{ + ZERO_STRUCT(b); + + INIT_LLIST_HEAD(&b->peers); + + b->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, + >phub_ctrg_io_desc, idx); + OSMO_ASSERT(b->counters_io); +} + +static int gtphub_bind_start(struct gtphub_bind *b, + const struct gtphub_cfg_bind *cfg, + osmo_fd_cb_t cb, void *cb_data, + unsigned int ofd_id) +{ + LOG(LOGL_DEBUG, "Starting bind %s\n", b->label); + if (gsn_addr_from_str(&b->local_addr, cfg->bind.addr_str) != 0) { + LOG(LOGL_FATAL, "Invalid bind address for %s: %s\n", + b->label, cfg->bind.addr_str); + return -1; + } + if (gtphub_sock_init(&b->ofd, &cfg->bind, cb, cb_data, ofd_id) != 0) { + LOG(LOGL_FATAL, "Cannot bind for %s: %s\n", + b->label, cfg->bind.addr_str); + return -1; + } + b->local_port = cfg->bind.port; + return 0; +} + +static void gtphub_bind_free(struct gtphub_bind *b) +{ + OSMO_ASSERT(llist_empty(&b->peers)); + if (b->counters_io) + rate_ctr_group_free(b->counters_io); +} + +static void gtphub_bind_stop(struct gtphub_bind *b) { + gtphub_sock_close(&b->ofd); + gtphub_bind_free(b); +} + +/* Recv datagram from from->fd, write sender's address to *from_addr. + * Return the number of bytes read, zero on error. */ +static int gtphub_read(const struct osmo_fd *from, + struct osmo_sockaddr *from_addr, + uint8_t *buf, size_t buf_len) +{ + OSMO_ASSERT(from_addr); + + /* recvfrom requires the available length set in *from_addr_len. */ + from_addr->l = sizeof(from_addr->a); + errno = 0; + ssize_t received = recvfrom(from->fd, buf, buf_len, 0, + (struct sockaddr*)&from_addr->a, + &from_addr->l); + /* TODO use recvmsg and get a MSG_TRUNC flag to make sure the message + * is not truncated. Then maybe reduce buf's size. */ + + if (received <= 0) { + LOG((errno == EAGAIN? LOGL_DEBUG : LOGL_ERROR), + "error: %s\n", strerror(errno)); + return 0; + } + + LOG(LOGL_DEBUG, "Received %d bytes from %s: %s%s\n", + (int)received, osmo_sockaddr_to_str(from_addr), + osmo_hexdump(buf, received > 1000? 1000 : received), + received > 1000 ? "..." : ""); + + return received; +} + +static inline void gtphub_port_ref_count_inc(struct gtphub_peer_port *pp) +{ + OSMO_ASSERT(pp); + OSMO_ASSERT(pp->ref_count < UINT_MAX); + pp->ref_count++; +} + +static inline void gtphub_port_ref_count_dec(struct gtphub_peer_port *pp) +{ + OSMO_ASSERT(pp); + OSMO_ASSERT(pp->ref_count > 0); + pp->ref_count--; +} + +static inline void set_seq(struct gtp_packet_desc *p, uint16_t seq) +{ + OSMO_ASSERT(p->version == 1); + p->data->gtp1l.h.seq = hton16(seq); + p->seq = seq; +} + +static inline void set_tei(struct gtp_packet_desc *p, uint32_t tei) +{ + OSMO_ASSERT(p->version == 1); + p->data->gtp1l.h.tei = hton32(tei); + p->header_tei = tei; +} + +static void gtphub_mapping_del_cb(struct expiring_item *expi); + +static struct nr_mapping *gtphub_mapping_new() +{ + struct nr_mapping *nrm; + nrm = talloc_zero(osmo_gtphub_ctx, struct nr_mapping); + OSMO_ASSERT(nrm); + + nr_mapping_init(nrm); + nrm->expiry_entry.del_cb = gtphub_mapping_del_cb; + return nrm; +} + + +#define APPEND(args...) \ + l = snprintf(pos, left, args); \ + pos += l; \ + left -= l + +static const char *gtphub_tunnel_side_str(struct gtphub_tunnel *tun, + int side_idx) +{ + static char buf[256]; + char *pos = buf; + int left = sizeof(buf); + int l; + + struct gtphub_tunnel_endpoint *c, *u; + c = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; + u = &tun->endpoint[side_idx][GTPH_PLANE_USER]; + + /* print both only if they differ. */ + if (!c->peer) { + APPEND("(uninitialized)"); + } else { + APPEND("%s", gsn_addr_to_str(&c->peer->peer_addr->addr)); + } + + if (!u->peer) { + if (c->peer) { + APPEND("/(uninitialized)"); + } + } else if ((!c->peer) + || (!gsn_addr_same(&u->peer->peer_addr->addr, + &c->peer->peer_addr->addr))) { + APPEND("/%s", gsn_addr_to_str(&u->peer->peer_addr->addr)); + } + + APPEND(" (TEI C=%x U=%x)", + c->tei_orig, + u->tei_orig); + return buf; +} + +const char *gtphub_tunnel_str(struct gtphub_tunnel *tun) +{ + static char buf[512]; + char *pos = buf; + int left = sizeof(buf); + int l; + + if (!tun) + return "null-tunnel"; + + APPEND("TEI=%x: ", tun->tei_repl); + APPEND("%s", gtphub_tunnel_side_str(tun, GTPH_SIDE_SGSN)); + APPEND(" <-> %s", gtphub_tunnel_side_str(tun, GTPH_SIDE_GGSN)); + + return buf; +} + +#undef APPEND + +void gtphub_tunnel_endpoint_set_peer(struct gtphub_tunnel_endpoint *te, + struct gtphub_peer_port *pp) +{ + if (te->peer) + gtphub_port_ref_count_dec(te->peer); + te->peer = pp; + if (te->peer) + gtphub_port_ref_count_inc(te->peer); +} + +int gtphub_tunnel_complete(struct gtphub_tunnel *tun) +{ + if (!tun) + return 0; + if (!tun->tei_repl) + return 0; + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + struct gtphub_tunnel_endpoint *te = + &tun->endpoint[side_idx][plane_idx]; + if (!(te->peer && te->tei_orig)) + return 0; + } + return 1; +} + +static void gtphub_tunnel_del_cb(struct expiring_item *expi) +{ + struct gtphub_tunnel *tun = container_of(expi, + struct gtphub_tunnel, + expiry_entry); + LOG(LOGL_DEBUG, "expired: %s\n", gtphub_tunnel_str(tun)); + + llist_del(&tun->entry); + INIT_LLIST_HEAD(&tun->entry); /* mark unused */ + + expi->del_cb = 0; /* avoid recursion loops */ + expiring_item_del(&tun->expiry_entry); /* usually already done, but make sure. */ + + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; + + /* clear ref count */ + gtphub_tunnel_endpoint_set_peer(te, NULL); + + rate_ctr_group_free(te->counters_io); + } + + talloc_free(tun); +} + +#define CTR_IDX(s, p, a, b) (a + s + (p + b) * 2) + +/* rate counter index for tunnels: [3; 6] */ +#define CTR_IDX_TUN(s, p) CTR_IDX(s, p, 1, 1) + +/* rate counter index for hubs: [7; 10] */ +#define CTR_IDX_HUB(s, p) CTR_IDX(s, p, 3, 2) + +static struct gtphub_tunnel *gtphub_tunnel_new() +{ + struct gtphub_tunnel *tun; + tun = talloc_zero(osmo_gtphub_ctx, struct gtphub_tunnel); + OSMO_ASSERT(tun); + + INIT_LLIST_HEAD(&tun->entry); + expiring_item_init(&tun->expiry_entry); + + int side_idx, plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; + te->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, + >phub_ctrg_io_desc, + CTR_IDX_TUN(side_idx, plane_idx)); + if (!te->counters_io) + return NULL; + } + + tun->expiry_entry.del_cb = gtphub_tunnel_del_cb; + return tun; +} + +static const char *gtphub_peer_strb(struct gtphub_peer *peer, char *buf, + int buflen) +{ + if (llist_empty(&peer->addresses)) + return "(addressless)"; + + struct gtphub_peer_addr *a = llist_first(&peer->addresses, + struct gtphub_peer_addr, + entry); + return gsn_addr_to_strb(&a->addr, buf, buflen); +} + +static const char *gtphub_port_strb(struct gtphub_peer_port *port, char *buf, + int buflen) +{ + if (!port) + return "(null port)"; + + snprintf(buf, buflen, "%s port %d", + gsn_addr_to_str(&port->peer_addr->addr), + (int)port->port); + return buf; +} + +const char *gtphub_peer_str(struct gtphub_peer *peer) +{ + static char buf[256]; + return gtphub_peer_strb(peer, buf, sizeof(buf)); +} + +const char *gtphub_port_str(struct gtphub_peer_port *port) +{ + static char buf[256]; + return gtphub_port_strb(port, buf, sizeof(buf)); +} + +static const char *gtphub_port_str2(struct gtphub_peer_port *port) +{ + static char buf[256]; + return gtphub_port_strb(port, buf, sizeof(buf)); +} + +static void gtphub_mapping_del_cb(struct expiring_item *expi) +{ + expi->del_cb = 0; /* avoid recursion loops */ + expiring_item_del(expi); /* usually already done, but make sure. */ + + struct nr_mapping *nrm = container_of(expi, + struct nr_mapping, + expiry_entry); + llist_del(&nrm->entry); + INIT_LLIST_HEAD(&nrm->entry); /* mark unused */ + + /* Just for log */ + struct gtphub_peer_port *from = nrm->origin; + OSMO_ASSERT(from); + LOG(LOGL_DEBUG, "expired: %d: nr mapping from %s: %u->%u\n", + (int)nrm->expiry_entry.expiry, + gtphub_port_str(from), + (unsigned int)nrm->orig, (unsigned int)nrm->repl); + + gtphub_port_ref_count_dec(from); + + talloc_free(nrm); +} + +static struct nr_mapping *gtphub_mapping_have(struct nr_map *map, + struct gtphub_peer_port *from, + nr_t orig_nr, + time_t now) +{ + struct nr_mapping *nrm; + + nrm = nr_map_get(map, from, orig_nr); + + if (!nrm) { + nrm = gtphub_mapping_new(); + nrm->orig = orig_nr; + nrm->origin = from; + nr_map_add(map, nrm, now); + gtphub_port_ref_count_inc(from); + LOG(LOGL_DEBUG, "peer %s: sequence map %d --> %d\n", + gtphub_port_str(from), + (int)(nrm->orig), (int)(nrm->repl)); + } else { + nr_map_refresh(map, nrm, now); + } + + OSMO_ASSERT(nrm); + return nrm; +} + +static void gtphub_map_seq(struct gtp_packet_desc *p, + struct gtphub_peer_port *from_port, + struct gtphub_peer_port *to_port) +{ + /* Store a mapping in to_peer's map, so when we later receive a GTP + * packet back from to_peer, the seq nr can be unmapped back to its + * origin (from_peer here). */ + struct nr_mapping *nrm; + nrm = gtphub_mapping_have(&to_port->peer_addr->peer->seq_map, + from_port, p->seq, p->timestamp); + + /* Change the GTP packet to yield the new, mapped seq nr */ + set_seq(p, nrm->repl); +} + +static struct gtphub_peer_port *gtphub_unmap_seq(struct gtp_packet_desc *p, + struct gtphub_peer_port *responding_port) +{ + OSMO_ASSERT(p->version == 1); + struct nr_mapping *nrm = + nr_map_get_inv(&responding_port->peer_addr->peer->seq_map, + p->seq); + if (!nrm) + return NULL; + LOG(LOGL_DEBUG, "peer %p: sequence unmap %d <-- %d\n", + nrm->origin, (int)(nrm->orig), (int)(nrm->repl)); + set_seq(p, nrm->orig); + return nrm->origin; +} + +static int gtphub_check_mapped_tei(struct gtphub_tunnel *new_tun, + struct gtphub_tunnel *iterated_tun, + uint32_t *tei_min, + uint32_t *tei_max) +{ + if (!new_tun->tei_repl || !iterated_tun->tei_repl) + return 1; + + *tei_min = (*tei_min < iterated_tun->tei_repl)? *tei_min : iterated_tun->tei_repl; + *tei_max = (*tei_max > iterated_tun->tei_repl)? *tei_max : iterated_tun->tei_repl; + + if (new_tun->tei_repl != iterated_tun->tei_repl) + return 1; + + /* new_tun->tei_repl is already taken. Try to find one out of the known + * range. */ + LOG(LOGL_DEBUG, "TEI replacement %d already taken.\n", new_tun->tei_repl); + + if ((*tei_max) < 0xffffffff) { + (*tei_max)++; + new_tun->tei_repl = *tei_max; + LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); + return 1; + } else if ((*tei_min) > 1) { + (*tei_min)--; + new_tun->tei_repl = *tei_min; + LOG(LOGL_DEBUG, "Using TEI %d instead.\n", new_tun->tei_repl); + return 1; + } + + /* None seems to be available. */ + return 0; +} + +static int gtphub_check_reused_teis(struct gtphub *hub, + struct gtphub_tunnel *new_tun) +{ + uint32_t tei_min = 0xffffffff; + uint32_t tei_max = 0; + int side_idx; + int plane_idx; + struct gtphub_tunnel_endpoint *te; + struct gtphub_tunnel_endpoint *te2; + + struct gtphub_tunnel *tun, *ntun; + + llist_for_each_entry_safe(tun, ntun, &hub->tunnels, entry) { + if (tun == new_tun) + continue; + + /* Check whether the GSN sent a TEI that it is reusing from a + * previous tunnel. */ + int tun_continue = 0; + for_each_side(side_idx) { + for_each_plane(plane_idx) { + te = &tun->endpoint[side_idx][plane_idx]; + te2 = &new_tun->endpoint[side_idx][plane_idx]; + if ((te->tei_orig == 0) + || (te->tei_orig != te2->tei_orig) + || (!te->peer) + || (!te2->peer) + || !gsn_addr_same(&te->peer->peer_addr->addr, + &te2->peer->peer_addr->addr)) + continue; + + /* The peer is reusing a TEI that I believe to + * be part of another tunnel. The other tunnel + * must be stale, then. */ + LOG(LOGL_NOTICE, + "Expiring tunnel due to reused TEI:" + " %s peer %s sent %s TEI %x," + " previously used by tunnel %s...\n", + gtphub_side_idx_names[side_idx], + gtphub_port_str(te->peer), + gtphub_plane_idx_names[plane_idx], + te->tei_orig, + gtphub_tunnel_str(tun)); + LOG(LOGL_NOTICE, "...while establishing tunnel %s\n", + gtphub_tunnel_str(new_tun)); + + expiring_item_del(&tun->expiry_entry); + /* continue to find more matches. There shouldn't be + * any, but let's make sure. However, tun is deleted, + * so we need to skip to the next tunnel. */ + tun_continue = 1; + break; + } + if (tun_continue) + break; + } + if (tun_continue) + continue; + + /* Check whether the mapped TEI is already used by another + * tunnel. */ + if (!gtphub_check_mapped_tei(new_tun, tun, &tei_min, &tei_max)) { + LOG(LOGL_ERROR, + "No mapped TEI is readily available." + " Searching for holes between occupied" + " TEIs not implemented."); + return 0; + } + + } + + return 1; +} + +static void gtphub_tunnel_refresh(struct gtphub *hub, + struct gtphub_tunnel *tun, + time_t now) +{ + expiry_add(&hub->expire_slowly, + &tun->expiry_entry, + now); +} + +static struct gtphub_tunnel_endpoint *gtphub_unmap_tei(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from, + struct gtphub_tunnel **unmapped_from_tun) +{ + OSMO_ASSERT(from); + int other_side = other_side_idx(p->side_idx); + + struct gtphub_tunnel *tun; + llist_for_each_entry(tun, &hub->tunnels, entry) { + struct gtphub_tunnel_endpoint *te_from = + &tun->endpoint[p->side_idx][p->plane_idx]; + struct gtphub_tunnel_endpoint *te_to = + &tun->endpoint[other_side][p->plane_idx]; + if ((tun->tei_repl == p->header_tei_rx) + && te_from->peer + && gsn_addr_same(&te_from->peer->peer_addr->addr, + &from->peer_addr->addr)) { + gtphub_tunnel_refresh(hub, tun, p->timestamp); + if (unmapped_from_tun) + *unmapped_from_tun = tun; + return te_to; + } + } + + if (unmapped_from_tun) + *unmapped_from_tun = NULL; + return NULL; +} + +static void gtphub_map_restart_counter(struct gtphub *hub, + struct gtp_packet_desc *p) +{ + if (p->rc != GTP_RC_PDU_C) + return; + + int ie_idx; + ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); + if (ie_idx < 0) + return; + + /* Always send gtphub's own restart counter */ + p->ie[ie_idx]->tv1.v = hton8(hub->restart_counter); +} + +static int gtphub_unmap_header_tei(struct gtphub_peer_port **to_port_p, + struct gtphub_tunnel **unmapped_from_tun, + struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_port) +{ + OSMO_ASSERT(p->version == 1); + *to_port_p = NULL; + if (unmapped_from_tun) + *unmapped_from_tun = NULL; + + /* If the header's TEI is zero, no PDP context has been established + * yet. If nonzero, a mapping should actually already exist for this + * TEI, since it must have been announced in a PDP context creation. */ + if (!p->header_tei_rx) + return 0; + + /* to_peer has previously announced a TEI, which was stored and + * mapped in a tunnel struct. */ + struct gtphub_tunnel_endpoint *to; + to = gtphub_unmap_tei(hub, p, from_port, unmapped_from_tun); + if (!to) { + LOG(LOGL_ERROR, "Received unknown TEI %" PRIx32 " from %s\n", + p->header_tei_rx, gtphub_port_str(from_port)); + return -1; + } + + if (unmapped_from_tun) { + OSMO_ASSERT(*unmapped_from_tun); + LOG(LOGL_DEBUG, "Unmapped TEI coming from: %s\n", + gtphub_tunnel_str(*unmapped_from_tun)); + } + + uint32_t unmapped_tei = to->tei_orig; + set_tei(p, unmapped_tei); + + /* May be NULL for an invalidated tunnel. */ + *to_port_p = to->peer; + + return 0; +} + +static int gtphub_handle_create_pdp_ctx(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_ctrl, + struct gtphub_peer_port *to_ctrl) +{ + int plane_idx; + + osmo_static_assert((GTPH_PLANE_CTRL == 0) && (GTPH_PLANE_USER == 1), + plane_nrs_match_GSN_addr_IE_indices); + + struct gtphub_tunnel *tun = p->tun; + + if (p->type == GTP_CREATE_PDP_REQ) { + if (p->side_idx != GTPH_SIDE_SGSN) { + LOG(LOGL_ERROR, "Wrong side: Create PDP Context" + " Request from the GGSN side: %s", + gtphub_port_str(from_ctrl)); + return -1; + } + + if (tun) { + LOG(LOGL_ERROR, "Not implemented: Received" + " Create PDP Context Request for an already" + " established tunnel:" + " from %s, tunnel %s\n", + gtphub_port_str(from_ctrl), + gtphub_tunnel_str(p->tun)); + return -1; + } + + /* A new tunnel. */ + tun = gtphub_tunnel_new(); + if (!tun) { + LOG(LOGL_ERROR, "Failed to allocate new tunnel %s <-> %s\n", + gtphub_port_str(from_ctrl), gtphub_port_str(to_ctrl)); + return -1; + } + p->tun = tun; + + /* Create TEI mapping */ + tun->tei_repl = nr_pool_next(&hub->tei_pool); + + llist_add(&tun->entry, &hub->tunnels); + gtphub_tunnel_refresh(hub, tun, p->timestamp); + /* The endpoint peers on this side (SGSN) will be set from IEs + * below. Also set the GGSN Ctrl endpoint, for logging. */ + gtphub_tunnel_endpoint_set_peer(&tun->endpoint[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], + to_ctrl); + } else if (p->type == GTP_CREATE_PDP_RSP) { + if (p->side_idx != GTPH_SIDE_GGSN) { + LOG(LOGL_ERROR, "Wrong side: Create PDP Context" + " Response from the SGSN side: %s", + gtphub_port_str(from_ctrl)); + return -1; + } + + /* The tunnel should already have been resolved from the header + * TEI and be available in tun (== p->tun). Just fill in the + * GSN Addresses below.*/ + OSMO_ASSERT(tun); + OSMO_ASSERT(tun->tei_repl == p->header_tei_rx); + OSMO_ASSERT(to_ctrl); + } + + uint8_t ie_type[] = { GTPIE_TEI_C, GTPIE_TEI_DI }; + int ie_mandatory = (p->type == GTP_CREATE_PDP_REQ); + unsigned int side_idx = p->side_idx; + + for_each_plane(plane_idx) { + int rc; + struct gsn_addr use_addr; + uint16_t use_port; + uint32_t tei_from_ie; + int ie_idx; + + /* Fetch GSN Address and TEI from IEs. As ensured by above + * static asserts, plane_idx corresponds to the GSN Address IE + * index (the first one = 0 = ctrl, second one = 1 = user). */ + rc = gsn_addr_get(&use_addr, p, plane_idx); + if (rc) { + LOG(LOGL_ERROR, "Cannot read %s GSN Address IE\n", + gtphub_plane_idx_names[plane_idx]); + return -1; + } + LOG(LOGL_DEBUG, "Read %s GSN addr %s (%d)\n", + gtphub_plane_idx_names[plane_idx], + gsn_addr_to_str(&use_addr), + use_addr.len); + + ie_idx = gtpie_getie(p->ie, ie_type[plane_idx], 0); + if (ie_idx < 0) { + if (ie_mandatory) { + LOG(LOGL_ERROR, + "Create PDP Context message invalid:" + " missing IE %d\n", + (int)ie_type[plane_idx]); + return -1; + } + tei_from_ie = 0; + } + else + tei_from_ie = ntoh32(p->ie[ie_idx]->tv4.v); + + /* Make sure an entry for this peer address with default port + * exists. + * + * Exception: if sgsn_use_sender is set, instead use the + * sender's address and port for Ctrl -- the User port is not + * known until the first User packet arrives. + * + * Note: doing this here is just an optimization, because + * gtphub_handle_buf() has code to replace the tunnel + * endpoints' addresses with the sender (needed for User + * plane). We could just ignore sgsn_use_sender here. But if we + * set up a default port here and replace it in + * gtphub_handle_buf(), we'd be creating a peer port just to + * expire it right away. */ + if (hub->sgsn_use_sender && (side_idx == GTPH_SIDE_SGSN)) { + int rc = gsn_addr_from_sockaddr(&use_addr, &use_port, &from_ctrl->sa); + if (rc < 0) + LOG(LOGL_ERROR, "%s(): failed to obtain GSN address\n", __func__); + } else { + use_port = gtphub_plane_idx_default_port[plane_idx]; + + } + + struct gtphub_peer_port *peer_from_ie; + peer_from_ie = gtphub_port_have(hub, + &hub->to_gsns[side_idx][plane_idx], + &use_addr, use_port); + + gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][plane_idx], + peer_from_ie); + + if (!tei_from_ie && + !tun->endpoint[side_idx][plane_idx].tei_orig) { + LOG(LOGL_ERROR, + "Create PDP Context message omits %s TEI, but" + " no TEI has been announced for this tunnel: %s\n", + gtphub_plane_idx_names[plane_idx], + gtphub_tunnel_str(tun)); + return -1; + } + + if (tei_from_ie) { + /* Replace TEI in GTP packet IE */ + tun->endpoint[side_idx][plane_idx].tei_orig = tei_from_ie; + p->ie[ie_idx]->tv4.v = hton32(tun->tei_repl); + + if (!gtphub_check_reused_teis(hub, tun)) { + /* It's highly unlikely that all TEIs are + * taken. But the code looking for an unused + * TEI is, at the time of writing this comment, + * not able to find gaps in the TEI space. To + * explicitly alert the user of this problem, + * rather abort than carry on. */ + LOG(LOGL_FATAL, "TEI range exhausted. Cannot create TEI mapping, aborting.\n"); + abort(); + } + } + + /* Replace the GSN address to reflect gtphub. */ + rc = gsn_addr_put(&hub->to_gsns[other_side_idx(side_idx)][plane_idx].local_addr, + p, plane_idx); + if (rc) { + LOG(LOGL_ERROR, "Cannot write %s GSN Address IE\n", + gtphub_plane_idx_names[plane_idx]); + return -1; + } + } + + if (p->type == GTP_CREATE_PDP_REQ) { + LOG(LOGL_DEBUG, "New tunnel, first half: %s\n", + gtphub_tunnel_str(tun)); + } else if (p->type == GTP_CREATE_PDP_RSP) { + LOG(LOGL_DEBUG, "New tunnel: %s\n", + gtphub_tunnel_str(tun)); + } + + return 0; +} + +static void pending_delete_del_cb(struct expiring_item *expi) +{ + struct pending_delete *pd; + pd = container_of(expi, struct pending_delete, expiry_entry); + + llist_del(&pd->entry); + INIT_LLIST_HEAD(&pd->entry); + + pd->expiry_entry.del_cb = 0; + expiring_item_del(&pd->expiry_entry); + + talloc_free(pd); +} + +static struct pending_delete *pending_delete_new(void) +{ + struct pending_delete *pd = talloc_zero(osmo_gtphub_ctx, struct pending_delete); + INIT_LLIST_HEAD(&pd->entry); + expiring_item_init(&pd->expiry_entry); + pd->expiry_entry.del_cb = pending_delete_del_cb; + return pd; +} + +static int gtphub_handle_delete_pdp_ctx(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_ctrl, + struct gtphub_peer_port *to_ctrl) +{ + struct gtphub_tunnel *known_tun = p->tun; + + if (p->type == GTP_DELETE_PDP_REQ) { + if (!known_tun) { + LOG(LOGL_ERROR, "Cannot find tunnel for Delete PDP Context Request.\n"); + return -1; + } + + /* Store the Delete Request until a successful Response is seen. */ + uint8_t teardown_ind; + uint8_t nsapi; + + if (gtpie_gettv1(p->ie, GTPIE_TEARDOWN, 0, &teardown_ind) != 0) { + LOG(LOGL_ERROR, "Missing Teardown Ind IE in Delete PDP Context Request.\n"); + return -1; + } + + if (gtpie_gettv1(p->ie, GTPIE_NSAPI, 0, &nsapi) != 0) { + LOG(LOGL_ERROR, "Missing NSAPI IE in Delete PDP Context Request.\n"); + return -1; + } + + struct pending_delete *pd = NULL; + + struct pending_delete *pdi = NULL; + llist_for_each_entry(pdi, &hub->pending_deletes, entry) { + if ((pdi->tun == known_tun) + && (pdi->teardown_ind == teardown_ind) + && (pdi->nsapi == nsapi)) { + pd = pdi; + break; + } + } + + if (!pd) { + pd = pending_delete_new(); + pd->tun = known_tun; + pd->teardown_ind = teardown_ind; + pd->nsapi = nsapi; + + LOG(LOGL_DEBUG, "Tunnel delete pending: %s\n", + gtphub_tunnel_str(known_tun)); + llist_add(&pd->entry, &hub->pending_deletes); + } + + /* Add or refresh timeout. */ + expiry_add(&hub->expire_quickly, &pd->expiry_entry, p->timestamp); + + /* If a pending_delete should expire before the response to + * indicate success comes in, the responding peer will have the + * tunnel deactivated, while the requesting peer gets no reply + * and keeps the tunnel. The hope is that the requesting peer + * will try again and get a useful response. */ + } else if (p->type == GTP_DELETE_PDP_RSP) { + /* Find the Delete Request for this Response. */ + struct pending_delete *pd = NULL; + + struct pending_delete *pdi; + llist_for_each_entry(pdi, &hub->pending_deletes, entry) { + if (known_tun == pdi->tun) { + pd = pdi; + break; + } + } + + if (!pd) { + LOG(LOGL_ERROR, "Delete PDP Context Response:" + " Cannot find matching request."); + /* If we delete the tunnel now, anyone can send a + * Delete response to kill tunnels at will. */ + return -1; + } + + /* TODO handle teardown_ind and nsapi */ + + expiring_item_del(&pd->expiry_entry); + + uint8_t cause; + if (gtpie_gettv1(p->ie, GTPIE_CAUSE, 0, &cause) != 0) { + LOG(LOGL_ERROR, "Delete PDP Context Response:" + " Missing Cause IE."); + /* If we delete the tunnel now, at least one of the + * peers may still think it is active. */ + return -1; + } + + if (cause != GTPCAUSE_ACC_REQ) { + LOG(LOGL_NOTICE, + "Delete PDP Context Response indicates failure;" + "for %s\n", + gtphub_tunnel_str(known_tun)); + return -1; + } + + LOG(LOGL_DEBUG, "Delete PDP Context: removing tunnel %s\n", + gtphub_tunnel_str(known_tun)); + p->tun = NULL; + expiring_item_del(&known_tun->expiry_entry); + } + + return 0; +} + +static int gtphub_handle_update_pdp_ctx(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_ctrl, + struct gtphub_peer_port *to_ctrl) +{ + /* TODO */ + return 0; +} + +/* Read GSN address IEs from p, and make sure these peer addresses exist in + * bind[plane_idx] with default ports, in their respective planes (both Ctrl + * and User). Map TEIs announced in IEs, and write mapped TEIs in-place into + * the packet p. */ +static int gtphub_handle_pdp_ctx(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_ctrl, + struct gtphub_peer_port *to_ctrl) +{ + OSMO_ASSERT(p->plane_idx == GTPH_PLANE_CTRL); + + switch (p->type) { + case GTP_CREATE_PDP_REQ: + case GTP_CREATE_PDP_RSP: + return gtphub_handle_create_pdp_ctx(hub, p, + from_ctrl, to_ctrl); + + case GTP_DELETE_PDP_REQ: + case GTP_DELETE_PDP_RSP: + return gtphub_handle_delete_pdp_ctx(hub, p, + from_ctrl, to_ctrl); + + case GTP_UPDATE_PDP_REQ: + case GTP_UPDATE_PDP_RSP: + return gtphub_handle_update_pdp_ctx(hub, p, + from_ctrl, to_ctrl); + + default: + /* Nothing to do for this message type. */ + return 0; + } + +} + +static int gtphub_send_del_pdp_ctx(struct gtphub *hub, + struct gtphub_tunnel *tun, + int to_side) +{ + static uint8_t del_ctx_msg[16] = { + 0x32, /* GTP v1 flags */ + GTP_DELETE_PDP_REQ, + 0x00, 0x08, /* Length in network byte order */ + 0x00, 0x00, 0x00, 0x00, /* TEI to be replaced */ + 0, 0, /* Seq, to be replaced */ + 0, 0, /* no extensions */ + 0x13, 0xff, /* 19: Teardown ind = 1 */ + 0x14, 0 /* 20: NSAPI = 0 */ + }; + + uint32_t *tei = (uint32_t*)&del_ctx_msg[4]; + uint16_t *seq = (uint16_t*)&del_ctx_msg[8]; + + struct gtphub_tunnel_endpoint *te = + &tun->endpoint[to_side][GTPH_PLANE_CTRL]; + + if (! te->peer) + return 0; + + *tei = hton32(te->tei_orig); + *seq = hton16(nr_pool_next(&te->peer->peer_addr->peer->seq_pool)); + + struct gtphub_bind *to_bind = &hub->to_gsns[to_side][GTPH_PLANE_CTRL]; + int rc = gtphub_write(&to_bind->ofd, &te->peer->sa, + del_ctx_msg, sizeof(del_ctx_msg)); + if (rc != 0) { + LOG(LOGL_ERROR, + "Failed to send out-of-band Delete PDP Context Request to %s\n", + gtphub_port_str(te->peer)); + } + return rc; +} + +/* Tell all peers on the other end of tunnels that PDP contexts are void. */ +static void gtphub_restarted(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *pp) +{ + LOG(LOGL_NOTICE, "Peer has restarted: %s\n", + gtphub_port_str(pp)); + + int deleted_count = 0; + struct gtphub_tunnel *tun; + llist_for_each_entry(tun, &hub->tunnels, entry) { + int side_idx; + for_each_side(side_idx) { + struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][GTPH_PLANE_CTRL]; + struct gtphub_tunnel_endpoint *te2 = &tun->endpoint[other_side_idx(side_idx)][GTPH_PLANE_CTRL]; + if ((!te->peer) + || (!te2->tei_orig) + || (pp->peer_addr->peer != te->peer->peer_addr->peer)) + continue; + + LOG(LOGL_DEBUG, "Deleting tunnel due to peer restart: %s\n", + gtphub_tunnel_str(tun)); + deleted_count ++; + + /* Send a Delete PDP Context Request to the + * peer on the other side, remember the pending + * delete and wait for the response to delete + * the tunnel. Clear this side of the tunnel to + * make sure it isn't used. + * + * Should the delete message send fail, or if no + * response is received, this tunnel will expire. If + * its TEIs come up in a new PDP Context Request, it + * will be removed. If messages for this tunnel should + * come in (from the not restarted side), they will be + * dropped because the tunnel is rendered unusable. */ + gtphub_send_del_pdp_ctx(hub, tun, other_side_idx(side_idx)); + + gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_CTRL], + NULL); + gtphub_tunnel_endpoint_set_peer(&tun->endpoint[side_idx][GTPH_PLANE_USER], + NULL); + } + } + + if (deleted_count) + LOG(LOGL_NOTICE, "Deleting %d tunnels due to restart of: %s\n", + deleted_count, + gtphub_port_str(pp)); +} + +static int get_restart_count(struct gtp_packet_desc *p) +{ + int ie_idx; + ie_idx = gtpie_getie(p->ie, GTPIE_RECOVERY, 0); + if (ie_idx < 0) + return -1; + return ntoh8(p->ie[ie_idx]->tv1.v); +} + +static void gtphub_check_restart_counter(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from) +{ + /* If the peer is sending a Recovery IE (7.7.11) with a restart counter + * that doesn't match the peer's previously sent restart counter, clear + * that peer and cancel PDP contexts. */ + + int restart = get_restart_count(p); + + if ((restart < 0) || (restart > 255)) + return; + + if ((from->last_restart_count >= 0) && (from->last_restart_count <= 255)) { + if (from->last_restart_count != restart) { + gtphub_restarted(hub, p, from); + } + } + + from->last_restart_count = restart; +} + +static int from_sgsns_read_cb(struct osmo_fd *from_sgsns_ofd, unsigned int what) +{ + unsigned int plane_idx = from_sgsns_ofd->priv_nr; + OSMO_ASSERT(plane_idx < GTPH_PLANE_N); + LOG(LOGL_DEBUG, "=== reading from SGSN (%s)\n", + gtphub_plane_idx_names[plane_idx]); + + if (!(what & BSC_FD_READ)) + return 0; + + struct gtphub *hub = from_sgsns_ofd->data; + + static uint8_t buf[4096]; + struct osmo_sockaddr from_addr; + struct osmo_sockaddr to_addr; + struct osmo_fd *to_ofd; + int len; + uint8_t *reply_buf; + + len = gtphub_read(from_sgsns_ofd, &from_addr, buf, sizeof(buf)); + if (len < 1) + return 0; + + len = gtphub_handle_buf(hub, GTPH_SIDE_SGSN, plane_idx, &from_addr, + buf, len, gtphub_now(), + &reply_buf, &to_ofd, &to_addr); + if (len < 1) + return 0; + + return gtphub_write(to_ofd, &to_addr, reply_buf, len); +} + +static int from_ggsns_read_cb(struct osmo_fd *from_ggsns_ofd, unsigned int what) +{ + unsigned int plane_idx = from_ggsns_ofd->priv_nr; + OSMO_ASSERT(plane_idx < GTPH_PLANE_N); + LOG(LOGL_DEBUG, "=== reading from GGSN (%s)\n", + gtphub_plane_idx_names[plane_idx]); + if (!(what & BSC_FD_READ)) + return 0; + + struct gtphub *hub = from_ggsns_ofd->data; + + static uint8_t buf[4096]; + struct osmo_sockaddr from_addr; + struct osmo_sockaddr to_addr; + struct osmo_fd *to_ofd; + int len; + uint8_t *reply_buf; + + len = gtphub_read(from_ggsns_ofd, &from_addr, buf, sizeof(buf)); + if (len < 1) + return 0; + + len = gtphub_handle_buf(hub, GTPH_SIDE_GGSN, plane_idx, &from_addr, + buf, len, gtphub_now(), + &reply_buf, &to_ofd, &to_addr); + if (len < 1) + return 0; + + return gtphub_write(to_ofd, &to_addr, reply_buf, len); +} + +static int gtphub_unmap(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from, + struct gtphub_peer_port *to_proxy, + struct gtphub_peer_port **final_unmapped, + struct gtphub_peer_port **unmapped_from_seq) +{ + /* Always (try to) unmap sequence and TEI numbers, which need to be + * replaced in the packet. Either way, give precedence to the proxy, if + * configured. */ + + if (unmapped_from_seq) + *unmapped_from_seq = NULL; + if (final_unmapped) + *final_unmapped = NULL; + p->tun = NULL; + + struct gtphub_peer_port *from_seq = NULL; + struct gtphub_peer_port *from_tei = NULL; + struct gtphub_peer_port *unmapped = NULL; + + from_seq = gtphub_unmap_seq(p, from); + + if (gtphub_unmap_header_tei(&from_tei, &p->tun, hub, p, from) < 0) + return -1; + + struct gtphub_peer *from_peer = from->peer_addr->peer; + if (from_seq && from_tei && (from_seq != from_tei)) { + LOG(LOGL_DEBUG, + "Seq unmap and TEI unmap yield two different peers." + " Using seq unmap." + " (from %s %s: seq %d yields %s, tei %u yields %s)\n", + gtphub_plane_idx_names[p->plane_idx], + gtphub_peer_str(from_peer), + (int)p->seq, + gtphub_port_str(from_seq), + (unsigned int)p->header_tei_rx, + gtphub_port_str2(from_tei) + ); + } + unmapped = (from_seq? from_seq : from_tei); + + if (unmapped && to_proxy && (unmapped != to_proxy)) { + LOG(LOGL_NOTICE, + "Unmap yields a different peer than the configured proxy." + " Using proxy." + " unmapped: %s proxy: %s\n", + gtphub_port_str(unmapped), + gtphub_port_str2(to_proxy) + ); + } + unmapped = (to_proxy? to_proxy : unmapped); + + if (!unmapped) { + /* Return no error, but returned pointers are all NULL. */ + return 0; + } + + if (unmapped_from_seq) + *unmapped_from_seq = from_seq; + if (final_unmapped) + *final_unmapped = unmapped; + return 0; +} + +static int gsn_addr_to_sockaddr(struct gsn_addr *src, + uint16_t port, + struct osmo_sockaddr *dst) +{ + return osmo_sockaddr_init_udp(dst, gsn_addr_to_str(src), port); +} + +/* If p is an Echo request, replace p's data with the matching response and + * return 1. If p is no Echo request, return 0, or -1 if an invalid packet is + * detected. */ +static int gtphub_handle_echo_req(struct gtphub *hub, struct gtp_packet_desc *p, + uint8_t **reply_buf) +{ + if (p->type != GTP_ECHO_REQ) + return 0; + + static uint8_t echo_response_data[14] = { + 0x32, /* GTP v1 flags */ + GTP_ECHO_RSP, + 0x00, 14 - 8, /* Length in network byte order */ + 0x00, 0x00, 0x00, 0x00, /* Zero TEI */ + 0, 0, /* Seq, to be replaced */ + 0, 0, /* no extensions */ + 0x0e, /* Recovery IE */ + 0 /* Restart counter, to be replaced */ + }; + uint16_t *seq = (uint16_t*)&echo_response_data[8]; + uint8_t *recovery = &echo_response_data[13]; + + *seq = hton16(p->seq); + *recovery = hub->restart_counter; + + *reply_buf = echo_response_data; + + return sizeof(echo_response_data); +} + +struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, + const struct osmo_sockaddr *addr); + +/* Parse buffer as GTP packet, replace elements in-place and return the ofd and + * address to forward to. Return a pointer to the osmo_fd, but copy the + * sockaddr to *to_addr. The reason for this is that the sockaddr may expire at + * any moment, while the osmo_fd is guaranteed to persist. Return the number of + * bytes to forward, 0 or less on failure. */ +int gtphub_handle_buf(struct gtphub *hub, + unsigned int side_idx, + unsigned int plane_idx, + const struct osmo_sockaddr *from_addr, + uint8_t *buf, + size_t received, + time_t now, + uint8_t **reply_buf, + struct osmo_fd **to_ofd, + struct osmo_sockaddr *to_addr) +{ + struct gtphub_bind *from_bind = &hub->to_gsns[side_idx][plane_idx]; + struct gtphub_bind *to_bind = &hub->to_gsns[other_side_idx(side_idx)][plane_idx]; + + rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_IN], + received); + + struct gtp_packet_desc p; + gtp_decode(buf, received, side_idx, plane_idx, &p, now); + + LOG(LOGL_DEBUG, "%s rx %s from %s %s%s\n", + (side_idx == GTPH_SIDE_GGSN)? "<-" : "->", + gtphub_plane_idx_names[plane_idx], + gtphub_side_idx_names[side_idx], + osmo_sockaddr_to_str(from_addr), + gtp_type_str(p.type)); + + if (p.rc <= 0) { + LOG(LOGL_ERROR, "INVALID: dropping GTP packet%s from %s %s %s\n", + gtp_type_str(p.type), + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + osmo_sockaddr_to_str(from_addr)); + return -1; + } + + rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_IN]); + + int reply_len; + reply_len = gtphub_handle_echo_req(hub, &p, reply_buf); + if (reply_len > 0) { + /* It was an echo. Nothing left to do. */ + osmo_sockaddr_copy(to_addr, from_addr); + *to_ofd = &from_bind->ofd; + + rate_ctr_inc(&from_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); + rate_ctr_add(&from_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], + reply_len); + LOG(LOGL_DEBUG, "%s Echo response to %s: %d bytes to %s\n", + (side_idx == GTPH_SIDE_GGSN)? "-->" : "<--", + gtphub_side_idx_names[side_idx], + (int)reply_len, osmo_sockaddr_to_str(to_addr)); + return reply_len; + } + if (reply_len < 0) + return -1; + + *to_ofd = &to_bind->ofd; + + /* If a proxy is configured, check that it's indeed that proxy talking + * to us. A proxy is a forced 1:1 connection, e.g. to another gtphub, + * so no-one else is allowed to talk to us from that side. */ + struct gtphub_peer_port *from_peer = hub->proxy[side_idx][plane_idx]; + if (from_peer) { + if (osmo_sockaddr_cmp(&from_peer->sa, from_addr) != 0) { + LOG(LOGL_ERROR, + "Rejecting: %s proxy configured, but GTP packet" + " received on %s bind is from another sender:" + " proxy: %s sender: %s\n", + gtphub_side_idx_names[side_idx], + gtphub_side_idx_names[side_idx], + gtphub_port_str(from_peer), + osmo_sockaddr_to_str(from_addr)); + return -1; + } + } + + if (!from_peer) { + /* Find or create a peer with a matching address. The sender's + * port may in fact differ. */ + from_peer = gtphub_known_addr_have_port(from_bind, from_addr); + } + + /* If any PDP context has been created, we already have an entry for + * this GSN. If we don't have an entry, a GGSN has nothing to tell us + * about, while an SGSN may initiate a PDP context. */ + if (!from_peer) { + if (side_idx == GTPH_SIDE_GGSN) { + LOG(LOGL_ERROR, "Dropping packet%s: unknown GGSN peer: %s\n", + gtp_type_str(p.type), + osmo_sockaddr_to_str(from_addr)); + return -1; + } else { + /* SGSN */ + /* A new peer. If this is on the Ctrl plane, an SGSN + * may make first contact without being known yet, so + * create the peer struct for the current sender. */ + if (plane_idx != GTPH_PLANE_CTRL) { + LOG(LOGL_ERROR, + "Dropping packet%s: User plane peer was not" + "announced by PDP Context: %s\n", + gtp_type_str(p.type), + osmo_sockaddr_to_str(from_addr)); + return -1; + } + + struct gsn_addr from_gsna; + uint16_t from_port; + if (gsn_addr_from_sockaddr(&from_gsna, &from_port, from_addr) != 0) + return -1; + + from_peer = gtphub_port_have(hub, from_bind, &from_gsna, from_port); + } + } + + if (!from_peer) { + /* This could theoretically happen for invalid address data or + * somesuch. */ + LOG(LOGL_ERROR, "Dropping packet%s: invalid %s peer: %s\n", + gtp_type_str(p.type), + gtphub_side_idx_names[side_idx], + osmo_sockaddr_to_str(from_addr)); + return -1; + } + + rate_ctr_add(&from_peer->counters_io->ctr[GTPH_CTR_BYTES_IN], + received); + rate_ctr_inc(&from_peer->counters_io->ctr[GTPH_CTR_PKTS_IN]); + + LOG(LOGL_DEBUG, "from %s peer: %s\n", gtphub_side_idx_names[side_idx], + gtphub_port_str(from_peer)); + + gtphub_check_restart_counter(hub, &p, from_peer); + gtphub_map_restart_counter(hub, &p); + + struct gtphub_peer_port *to_peer_from_seq; + struct gtphub_peer_port *to_peer; + if (gtphub_unmap(hub, &p, from_peer, + hub->proxy[other_side_idx(side_idx)][plane_idx], + &to_peer, &to_peer_from_seq) + != 0) { + return -1; + } + + if (p.tun) { + struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[p.side_idx][p.plane_idx]; + rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_IN], + received); + rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_IN]); + } + + if ((!to_peer) && (side_idx == GTPH_SIDE_SGSN)) { + if (gtphub_resolve_ggsn(hub, &p, &to_peer) < 0) + return -1; + } + + if (!to_peer && p.tun && p.type == GTP_DELETE_PDP_RSP) { + /* It's a delete confirmation for a tunnel that is partly + * invalid, probably marked unsuable due to a restarted peer. + * Remove the tunnel and be happy without forwarding. */ + expiring_item_del(&p.tun->expiry_entry); + p.tun = NULL; + return 0; + } + + if (!to_peer) { + LOG(LOGL_ERROR, "No %s to send to. Dropping packet%s" + " (type=%" PRIu8 ", header-TEI=%" PRIx32 ", seq=%" PRIx16 ").\n", + gtphub_side_idx_names[other_side_idx(side_idx)], + gtp_type_str(p.type), + p.type, p.header_tei_rx, p.seq + ); + return -1; + } + + if (plane_idx == GTPH_PLANE_CTRL) { + /* This may be a Create PDP Context response. If it is, there + * are other addresses in the GTP message to set up apart from + * the sender. */ + if (gtphub_handle_pdp_ctx(hub, &p, from_peer, to_peer) + != 0) + return -1; + } + + /* Either to_peer was resolved from an existing tunnel, + * or a PDP Ctx and thus a tunnel has just been created, + * or the tunnel has been deleted due to this message. */ + OSMO_ASSERT(p.tun || (p.type == GTP_DELETE_PDP_RSP)); + + /* If the GGSN is replying to an SGSN request, the sequence nr has + * already been unmapped above (to_peer_from_seq != NULL), and we need not + * create a new mapping. */ + if (!to_peer_from_seq) + gtphub_map_seq(&p, from_peer, to_peer); + + osmo_sockaddr_copy(to_addr, &to_peer->sa); + + *reply_buf = (uint8_t*)p.data; + + if (received) { + rate_ctr_inc(&to_bind->counters_io->ctr[GTPH_CTR_PKTS_OUT]); + rate_ctr_add(&to_bind->counters_io->ctr[GTPH_CTR_BYTES_OUT], + received); + + rate_ctr_inc(&to_peer->counters_io->ctr[GTPH_CTR_PKTS_OUT]); + rate_ctr_add(&to_peer->counters_io->ctr[GTPH_CTR_BYTES_OUT], + received); + } + + if (p.tun) { + struct gtphub_tunnel_endpoint *te = &p.tun->endpoint[other_side_idx(p.side_idx)][p.plane_idx]; + rate_ctr_inc(&te->counters_io->ctr[GTPH_CTR_PKTS_OUT]); + rate_ctr_add(&te->counters_io->ctr[GTPH_CTR_BYTES_OUT], + received); + } + + LOG(LOGL_DEBUG, "%s Forward to %s:" + " header-TEI %" PRIx32", seq %" PRIx16", %d bytes to %s\n", + (side_idx == GTPH_SIDE_SGSN)? "-->" : "<--", + gtphub_side_idx_names[other_side_idx(side_idx)], + p.header_tei, p.seq, + (int)received, osmo_sockaddr_to_str(to_addr)); + return received; +} + +static void resolved_gssn_del_cb(struct expiring_item *expi) +{ + struct gtphub_resolved_ggsn *ggsn; + ggsn = container_of(expi, struct gtphub_resolved_ggsn, expiry_entry); + + gtphub_port_ref_count_dec(ggsn->peer); + llist_del(&ggsn->entry); + + ggsn->expiry_entry.del_cb = 0; + expiring_item_del(&ggsn->expiry_entry); + + talloc_free(ggsn); +} + +void gtphub_resolved_ggsn(struct gtphub *hub, const char *apn_oi_str, + struct gsn_addr *resolved_addr, + time_t now) +{ + struct gtphub_peer_port *pp; + struct gtphub_resolved_ggsn *ggsn; + + LOG(LOGL_DEBUG, "Resolved GGSN callback: %s %s\n", + apn_oi_str, osmo_hexdump((unsigned char*)resolved_addr, + sizeof(*resolved_addr))); + + pp = gtphub_port_have(hub, &hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], + resolved_addr, 2123); + if (!pp) { + LOG(LOGL_ERROR, "Internal: Cannot create/find peer '%s'\n", + gsn_addr_to_str(resolved_addr)); + return; + } + + ggsn = talloc_zero(osmo_gtphub_ctx, struct gtphub_resolved_ggsn); + OSMO_ASSERT(ggsn); + INIT_LLIST_HEAD(&ggsn->entry); + expiring_item_init(&ggsn->expiry_entry); + + ggsn->peer = pp; + gtphub_port_ref_count_inc(pp); + + osmo_strlcpy(ggsn->apn_oi_str, apn_oi_str, sizeof(ggsn->apn_oi_str)); + + ggsn->expiry_entry.del_cb = resolved_gssn_del_cb; + expiry_add(&hub->expire_slowly, &ggsn->expiry_entry, now); + + llist_add(&ggsn->entry, &hub->resolved_ggsns); +} + +static int gtphub_gc_peer_port(struct gtphub_peer_port *pp) +{ + return pp->ref_count == 0; +} + +static int gtphub_gc_peer_addr(struct gtphub_peer_addr *pa) +{ + struct gtphub_peer_port *pp, *npp; + llist_for_each_entry_safe(pp, npp, &pa->ports, entry) { + if (gtphub_gc_peer_port(pp)) { + LOG(LOGL_DEBUG, "expired: peer %s\n", + gtphub_port_str(pp)); + gtphub_peer_port_del(pp); + } + } + return llist_empty(&pa->ports); +} + +static int gtphub_gc_peer(struct gtphub_peer *p) +{ + struct gtphub_peer_addr *pa, *npa; + llist_for_each_entry_safe(pa, npa, &p->addresses, entry) { + if (gtphub_gc_peer_addr(pa)) { + gtphub_peer_addr_del(pa); + } + } + + /* Note that there's a ref_count in each gtphub_peer_port instance + * listed within p->addresses, referenced by TEI mappings from + * hub->tei_map. As long as those don't expire, this peer will stay. */ + + return llist_empty(&p->addresses) + && nr_map_empty(&p->seq_map); +} + +static void gtphub_gc_bind(struct gtphub_bind *b) +{ + struct gtphub_peer *p, *n; + llist_for_each_entry_safe(p, n, &b->peers, entry) { + if (gtphub_gc_peer(p)) { + gtphub_peer_del(p); + } + } +} + +void gtphub_gc(struct gtphub *hub, time_t now) +{ + int expired; + expired = expiry_tick(&hub->expire_quickly, now); + expired += expiry_tick(&hub->expire_slowly, now); + + /* ... */ + + if (expired) { + int s, p; + for_each_side_and_plane(s, p) { + gtphub_gc_bind(&hub->to_gsns[s][p]); + } + } +} + +static void gtphub_gc_cb(void *data) +{ + struct gtphub *hub = data; + gtphub_gc(hub, gtphub_now()); + osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); +} + +static void gtphub_gc_start(struct gtphub *hub) +{ + osmo_timer_setup(&hub->gc_timer, gtphub_gc_cb, hub); + osmo_timer_schedule(&hub->gc_timer, GTPH_GC_TICK_SECONDS, 0); +} + +/* called by unit tests */ +void gtphub_init(struct gtphub *hub) +{ + gtphub_zero(hub); + + INIT_LLIST_HEAD(&hub->tunnels); + INIT_LLIST_HEAD(&hub->pending_deletes); + + expiry_init(&hub->expire_quickly, GTPH_EXPIRE_QUICKLY_SECS); + expiry_init(&hub->expire_slowly, GTPH_EXPIRE_SLOWLY_MINUTES * 60); + + nr_pool_init(&hub->tei_pool, 1, 0xffffffff); + + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + gtphub_bind_init(&hub->to_gsns[side_idx][plane_idx], CTR_IDX_HUB(side_idx, plane_idx)); + } + + hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].label = "SGSN Ctrl"; + hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].label = "GGSN Ctrl"; + hub->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].label = "SGSN User"; + hub->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].label = "GGSN User"; +} + +/* For the test suite, this is kept separate from gtphub_stop(), which also + * closes sockets. The test suite avoids using sockets and would cause + * segfaults when trying to close uninitialized ofds. */ +void gtphub_free(struct gtphub *hub) +{ + /* By expiring all mappings, a garbage collection should free + * everything else. A gtphub_bind_free() will assert that everything is + * indeed empty. */ + expiry_clear(&hub->expire_quickly); + expiry_clear(&hub->expire_slowly); + + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + gtphub_gc_bind(&hub->to_gsns[side_idx][plane_idx]); + gtphub_bind_free(&hub->to_gsns[side_idx][plane_idx]); + } +} + +void gtphub_stop(struct gtphub *hub) +{ + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + gtphub_bind_stop(&hub->to_gsns[side_idx][plane_idx]); + } + gtphub_free(hub); +} + +static int gtphub_make_proxy(struct gtphub *hub, + struct gtphub_peer_port **pp, + struct gtphub_bind *bind, + const struct gtphub_cfg_addr *addr) +{ + if (!addr->addr_str) + return 0; + + struct gsn_addr gsna; + if (gsn_addr_from_str(&gsna, addr->addr_str) != 0) + return -1; + + *pp = gtphub_port_have(hub, bind, &gsna, addr->port); + + /* This is *the* proxy. Make sure it is never expired. */ + gtphub_port_ref_count_inc(*pp); + return 0; +} + +int gtphub_start(struct gtphub *hub, struct gtphub_cfg *cfg, + uint8_t restart_counter) +{ + gtphub_init(hub); + + hub->restart_counter = restart_counter; + hub->sgsn_use_sender = cfg->sgsn_use_sender? 1 : 0; + + /* If a Ctrl plane proxy is configured, ares will never be used. */ + if (!cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) { + if (gtphub_ares_init(hub) != 0) { + LOG(LOGL_FATAL, "Failed to initialize ares\n"); + return -1; + } + } + + int side_idx; + int plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + int rc; + rc = gtphub_bind_start(&hub->to_gsns[side_idx][plane_idx], + &cfg->to_gsns[side_idx][plane_idx], + (side_idx == GTPH_SIDE_SGSN) + ? from_sgsns_read_cb + : from_ggsns_read_cb, + hub, plane_idx); + if (rc) { + LOG(LOGL_FATAL, "Failed to bind for %ss (%s)\n", + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx]); + return rc; + } + } + + for_each_side_and_plane(side_idx, plane_idx) { + if (gtphub_make_proxy(hub, + &hub->proxy[side_idx][plane_idx], + &hub->to_gsns[side_idx][plane_idx], + &cfg->proxy[side_idx][plane_idx]) + != 0) { + LOG(LOGL_FATAL, "Cannot configure %s proxy" + " %s port %d.\n", + gtphub_side_idx_names[side_idx], + cfg->proxy[side_idx][plane_idx].addr_str, + (int)cfg->proxy[side_idx][plane_idx].port); + return -1; + } + } + + for_each_side_and_plane(side_idx, plane_idx) { + if (hub->proxy[side_idx][plane_idx]) + LOG(LOGL_NOTICE, "Using %s %s proxy %s\n", + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + gtphub_port_str(hub->proxy[side_idx][plane_idx])); + } + + if (hub->sgsn_use_sender) + LOG(LOGL_NOTICE, "Using sender address and port for SGSN instead of GSN Addr IE and default ports.\n"); + + gtphub_gc_start(hub); + return 0; +} + +static struct gtphub_peer_addr *gtphub_peer_find_addr(const struct gtphub_peer *peer, + const struct gsn_addr *addr) +{ + struct gtphub_peer_addr *a; + llist_for_each_entry(a, &peer->addresses, entry) { + if (gsn_addr_same(&a->addr, addr)) + return a; + } + return NULL; +} + +static struct gtphub_peer_port *gtphub_addr_find_port(const struct gtphub_peer_addr *a, + uint16_t port) +{ + OSMO_ASSERT(port); + struct gtphub_peer_port *pp; + llist_for_each_entry(pp, &a->ports, entry) { + if (pp->port == port) + return pp; + } + return NULL; +} + +static struct gtphub_peer_addr *gtphub_addr_find(const struct gtphub_bind *bind, + const struct gsn_addr *addr) +{ + struct gtphub_peer *peer; + llist_for_each_entry(peer, &bind->peers, entry) { + struct gtphub_peer_addr *a = gtphub_peer_find_addr(peer, addr); + if (a) + return a; + } + return NULL; +} + +static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind, + const struct gsn_addr *addr, + uint16_t port) +{ + struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); + if (!a) + return NULL; + return gtphub_addr_find_port(a, port); +} + +struct gtphub_peer_port *gtphub_port_find_sa(const struct gtphub_bind *bind, + const struct osmo_sockaddr *addr) +{ + struct gsn_addr gsna; + uint16_t port; + if (gsn_addr_from_sockaddr(&gsna, &port, addr) != 0) + return NULL; + + return gtphub_port_find(bind, &gsna, port); +} + +static struct gtphub_peer *gtphub_peer_new(struct gtphub *hub, + struct gtphub_bind *bind) +{ + struct gtphub_peer *peer = talloc_zero(osmo_gtphub_ctx, + struct gtphub_peer); + OSMO_ASSERT(peer); + + INIT_LLIST_HEAD(&peer->addresses); + + nr_pool_init(&peer->seq_pool, 0, 0xffff); + nr_map_init(&peer->seq_map, &peer->seq_pool, &hub->expire_quickly); + + /* TODO use something random to pick the initial sequence nr. + 0x6d31 produces the ASCII character sequence 'm1', currently used in + gtphub_nc_test.sh. */ + peer->seq_pool.last_nr = 0x6d31 - 1; + + llist_add(&peer->entry, &bind->peers); + return peer; +} + +static struct gtphub_peer_addr *gtphub_peer_add_addr(struct gtphub_peer *peer, + const struct gsn_addr *addr) +{ + struct gtphub_peer_addr *a; + a = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_addr); + OSMO_ASSERT(a); + a->peer = peer; + gsn_addr_copy(&a->addr, addr); + INIT_LLIST_HEAD(&a->ports); + llist_add(&a->entry, &peer->addresses); + + return a; +} + +static struct gtphub_peer_addr *gtphub_addr_have(struct gtphub *hub, + struct gtphub_bind *bind, + const struct gsn_addr *addr) +{ + struct gtphub_peer_addr *a = gtphub_addr_find(bind, addr); + if (a) + return a; + + /* If we haven't found an address, that means we need to create an + * entirely new peer for the new address. More addresses may be added + * to this peer later, but not via this function. */ + struct gtphub_peer *peer = gtphub_peer_new(hub, bind); + + a = gtphub_peer_add_addr(peer, addr); + + LOG(LOGL_DEBUG, "New peer address: %s %s\n", + bind->label, + gsn_addr_to_str(&a->addr)); + + return a; +} + +static struct gtphub_peer_port *gtphub_addr_add_port(struct gtphub_peer_addr *a, + uint16_t port) +{ + struct gtphub_peer_port *pp; + + pp = talloc_zero(osmo_gtphub_ctx, struct gtphub_peer_port); + OSMO_ASSERT(pp); + pp->peer_addr = a; + pp->port = port; + pp->last_restart_count = -1; + + if (gsn_addr_to_sockaddr(&a->addr, port, &pp->sa) != 0) { + talloc_free(pp); + return NULL; + } + + pp->counters_io = rate_ctr_group_alloc(osmo_gtphub_ctx, + >phub_ctrg_io_desc, port); + if (!pp->counters_io) { + LOG(LOGL_ERROR, "Failed to allocate rate counters for %s:%u\n", gsn_addr_to_str(&a->addr), port); + talloc_free(pp); + return NULL; + } + + llist_add(&pp->entry, &a->ports); + + LOG(LOGL_DEBUG, "New peer port: %s port %d\n", + gsn_addr_to_str(&a->addr), + (int)port); + + return pp; +} + +struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub, + struct gtphub_bind *bind, + const struct gsn_addr *addr, + uint16_t port) +{ + struct gtphub_peer_addr *a = gtphub_addr_have(hub, bind, addr); + + struct gtphub_peer_port *pp = gtphub_addr_find_port(a, port); + if (pp) + return pp; + + return gtphub_addr_add_port(a, port); +} + +/* Find a GGSN peer with a matching address. If the address is known but the + * port not, create a new port for that peer address. */ +struct gtphub_peer_port *gtphub_known_addr_have_port(const struct gtphub_bind *bind, + const struct osmo_sockaddr *addr) +{ + struct gtphub_peer_addr *pa; + struct gtphub_peer_port *pp; + + struct gsn_addr gsna; + uint16_t port; + int rc = gsn_addr_from_sockaddr(&gsna, &port, addr); + if (rc < 0) + LOG(LOGL_ERROR, "%s(): failed to obtain GSN address\n", __func__); + + pa = gtphub_addr_find(bind, &gsna); + if (!pa) + return NULL; + + pp = gtphub_addr_find_port(pa, port); + + if (!pp) + pp = gtphub_addr_add_port(pa, port); + + return pp; +} + + +/* Return 0 if the message in p is not applicable for GGSN resolution, -1 if + * resolution should be possible but failed, and 1 if resolution was + * successful. *pp will be set to NULL if <1 is returned. */ +static int gtphub_resolve_ggsn(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port **pp) +{ + *pp = NULL; + + /* TODO determine from message type whether IEs should be present? */ + + int rc; + const char *imsi_str; + rc = get_ie_imsi_str(p->ie, 0, &imsi_str); + if (rc < 1) + return rc; + OSMO_ASSERT(imsi_str); + + const char *apn_str; + rc = get_ie_apn_str(p->ie, &apn_str); + if (rc < 1) + return rc; + OSMO_ASSERT(apn_str); + + *pp = gtphub_resolve_ggsn_addr(hub, imsi_str, apn_str); + return (*pp)? 1 : -1; +} + + +/* TODO move to osmocom/core/socket.c ? */ +/* use this in osmo_sock_init() to remove dup. */ +/* Internal: call getaddrinfo for osmo_sockaddr_init(). The caller is required + to call freeaddrinfo(*result), iff zero is returned. */ +static int _osmo_getaddrinfo(struct addrinfo **result, + uint16_t family, uint16_t type, uint8_t proto, + const char *host, uint16_t port) +{ + struct addrinfo hints; + char portbuf[16]; + + sprintf(portbuf, "%u", port); + memset(&hints, '\0', sizeof(struct addrinfo)); + hints.ai_family = family; + if (type == SOCK_RAW) { + /* Workaround for glibc, that returns EAI_SERVICE (-8) if + * SOCK_RAW and IPPROTO_GRE is used. + */ + hints.ai_socktype = SOCK_DGRAM; + hints.ai_protocol = IPPROTO_UDP; + } else { + hints.ai_socktype = type; + hints.ai_protocol = proto; + } + + return getaddrinfo(host, portbuf, &hints, result); +} + +/* TODO move to osmocom/core/socket.c ? */ +int osmo_sockaddr_init(struct osmo_sockaddr *addr, + uint16_t family, uint16_t type, uint8_t proto, + const char *host, uint16_t port) +{ + struct addrinfo *res; + int rc; + rc = _osmo_getaddrinfo(&res, family, type, proto, host, port); + + if (rc != 0) { + LOG(LOGL_ERROR, "getaddrinfo returned error %d\n", (int)rc); + return -EINVAL; + } + + OSMO_ASSERT(res->ai_addrlen <= sizeof(addr->a)); + memcpy(&addr->a, res->ai_addr, res->ai_addrlen); + addr->l = res->ai_addrlen; + freeaddrinfo(res); + + return 0; +} + +int osmo_sockaddr_to_strs(char *addr_str, size_t addr_str_len, + char *port_str, size_t port_str_len, + const struct osmo_sockaddr *addr, + int flags) +{ + int rc; + + if ((addr->l < 1) || (addr->l > sizeof(addr->a))) { + LOGP(DGTPHUB, LOGL_ERROR, "Invalid address size: %d\n", addr->l); + return -1; + } + + if (addr->l > sizeof(addr->a)) { + LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: too long: %d\n", + addr->l); + return -1; + } + + rc = getnameinfo((struct sockaddr*)&addr->a, addr->l, + addr_str, addr_str_len, + port_str, port_str_len, + flags); + + if (rc) + LOGP(DGTPHUB, LOGL_ERROR, "Invalid address: %s: %s\n", + gai_strerror(rc), osmo_hexdump((uint8_t*)&addr->a, + addr->l)); + + return rc; +} + +const char *osmo_sockaddr_to_strb(const struct osmo_sockaddr *addr, + char *buf, size_t buf_len) +{ + const int portbuf_len = 6; + OSMO_ASSERT(buf_len > portbuf_len); + char *portbuf = buf + buf_len - portbuf_len; + buf_len -= portbuf_len; + if (osmo_sockaddr_to_strs(buf, buf_len, + portbuf, portbuf_len, + addr, + NI_NUMERICHOST | NI_NUMERICSERV)) + return NULL; + + char *pos = buf + strnlen(buf, buf_len-1); + size_t len = buf_len - (pos - buf); + + snprintf(pos, len, " port %s", portbuf); + buf[buf_len-1] = '\0'; + + return buf; +} + +const char *osmo_sockaddr_to_str(const struct osmo_sockaddr *addr) +{ + static char buf[256]; + const char *result = osmo_sockaddr_to_strb(addr, buf, sizeof(buf)); + if (! result) + return "(invalid)"; + return result; +} + +int osmo_sockaddr_cmp(const struct osmo_sockaddr *a, + const struct osmo_sockaddr *b) +{ + if (a == b) + return 0; + if (!a) + return -1; + if (!b) + return 1; + if (a->l != b->l) { + /* Lengths are not the same, but determine the order. Will + * anyone ever sort a list by osmo_sockaddr though...? */ + int cmp = memcmp(&a->a, &b->a, (a->l < b->l)? a->l : b->l); + if (cmp == 0) { + if (a->l < b->l) + return -1; + else + return 1; + } + return cmp; + } + return memcmp(&a->a, &b->a, a->l); +} + +void osmo_sockaddr_copy(struct osmo_sockaddr *dst, + const struct osmo_sockaddr *src) +{ + OSMO_ASSERT(src->l <= sizeof(dst->a)); + memcpy(&dst->a, &src->a, src->l); + dst->l = src->l; +} diff --git a/src/gtphub/gtphub_ares.c b/src/gtphub/gtphub_ares.c new file mode 100644 index 000000000..87dc860c4 --- /dev/null +++ b/src/gtphub/gtphub_ares.c @@ -0,0 +1,220 @@ +/* GTP Hub Implementation */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * gtphub_ares.c. + * + * This file is kept separate so that these functions can be wrapped for + * gtphub_test.c. When a function and its callers are in the same compilational + * unit, the wrappability may be optimized away. + * + * Author: Neels Hofmeyr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + */ + +#include +#include + +#include +#include + +#include +#include + +/* TODO split GRX ares from sgsn into a separate struct and allow use without + * globals. */ +#include +extern struct sgsn_instance *sgsn; + +struct sgsn_instance sgsn_inst = { 0 }; +struct sgsn_instance *sgsn = &sgsn_inst; + +extern void *osmo_gtphub_ctx; + +int gtphub_ares_init(struct gtphub *hub) +{ + return sgsn_ares_init(sgsn); +} + +struct ggsn_lookup { + struct llist_head entry; + struct expiring_item expiry_entry; + + struct gtphub *hub; + + char imsi_str[GSM23003_IMSI_MAX_DIGITS+1]; + char apn_ni_str[GSM_APN_LENGTH]; + char apn_oi_str[GSM_APN_LENGTH]; + int have_3dig_mnc; +}; + +static int start_ares_query(struct ggsn_lookup *lookup); + +static void ggsn_lookup_cb(void *arg, int status, int timeouts, + struct hostent *hostent) +{ + struct ggsn_lookup *lookup = arg; + LOGP(DGTPHUB, LOGL_NOTICE, "ggsn_lookup_cb(%p / %p)", lookup, + &lookup->expiry_entry); + + if (status != ARES_SUCCESS) { + LOGP(DGTPHUB, LOGL_ERROR, "DNS query failed.\n"); + + /* Need to try with three digits now */ + if (!lookup->have_3dig_mnc) { + lookup->have_3dig_mnc = 1; + if (start_ares_query(lookup) == 0) + return; + } + + LOGP(DGTPHUB, LOGL_ERROR, "Failed to resolve GGSN. (%p)\n", + lookup); + goto remove_from_queue; + } + + struct gsn_addr resolved_addr; + if (hostent->h_length > sizeof(resolved_addr.buf)) { + LOGP(DGTPHUB, LOGL_ERROR, "Addr size too large: %d > %d\n", + (int)hostent->h_length, (int)sizeof(resolved_addr.buf)); + goto remove_from_queue; + } + + /* Get the first addr from the list */ + char *addr0 = hostent->h_addr_list[0]; + if (!addr0) { + LOGP(DGTPHUB, LOGL_ERROR, "No host address.\n"); + goto remove_from_queue; + } + + memcpy(resolved_addr.buf, addr0, hostent->h_length); + resolved_addr.len = hostent->h_length; + + LOGP(DGTPHUB, LOGL_NOTICE, "resolved addr %s\n", + osmo_hexdump((unsigned char*)&resolved_addr, + sizeof(resolved_addr))); + + gtphub_resolved_ggsn(lookup->hub, lookup->apn_oi_str, &resolved_addr, + gtphub_now()); + +remove_from_queue: + LOGP(DGTPHUB, LOGL_ERROR, "Removing GGSN lookup. (%p / %p)\n", lookup, + &lookup->expiry_entry); + expiring_item_del(&lookup->expiry_entry); +} + +static void make_addr_str(struct ggsn_lookup *lookup) +{ + char *apn_oi_str; + apn_oi_str = osmo_apn_qualify_from_imsi(lookup->imsi_str, + lookup->apn_ni_str, + lookup->have_3dig_mnc); + osmo_strlcpy(lookup->apn_oi_str, apn_oi_str, + sizeof(lookup->apn_oi_str)); +} + +static int start_ares_query(struct ggsn_lookup *lookup) +{ + LOGP(DGTPHUB, LOGL_DEBUG, "Going to query %s (%p / %p)\n", + lookup->apn_oi_str, lookup, &lookup->expiry_entry); + + int rc = sgsn_ares_query(sgsn, lookup->apn_oi_str, ggsn_lookup_cb, + lookup); + if (rc != 0) + LOGP(DGTPHUB, LOGL_ERROR, "Failed to start ares query.\n"); + return rc; +} + +static void ggsn_lookup_del_cb(struct expiring_item *expi) +{ + struct ggsn_lookup *lookup; + lookup = container_of(expi, struct ggsn_lookup, expiry_entry); + + LOGP(DGTPHUB, LOGL_NOTICE, "ggsn_lookup_del_cb(%p / %p)\n", lookup, + expi); + + lookup->expiry_entry.del_cb = 0; + expiring_item_del(expi); + + llist_del(&lookup->entry); + talloc_free(lookup); +} + +struct gtphub_peer_port *gtphub_resolve_ggsn_addr(struct gtphub *hub, + const char *imsi_str, + const char *apn_ni_str) +{ + OSMO_ASSERT(imsi_str); + OSMO_ASSERT(apn_ni_str); + + struct ggsn_lookup *lookup = talloc_zero(osmo_gtphub_ctx, + struct ggsn_lookup); + OSMO_ASSERT(lookup); + + LOGP(DGTPHUB, LOGL_DEBUG, "Request to resolve IMSI" + " '%s' with APN-NI '%s' (%p / %p)\n", + imsi_str, apn_ni_str, lookup, &lookup->expiry_entry); + + expiring_item_init(&lookup->expiry_entry); + lookup->hub = hub; + + osmo_strlcpy(lookup->imsi_str, imsi_str, sizeof(lookup->imsi_str)); + osmo_strlcpy(lookup->apn_ni_str, apn_ni_str, + sizeof(lookup->apn_ni_str)); + + make_addr_str(lookup); + + struct ggsn_lookup *active; + llist_for_each_entry(active, &hub->ggsn_lookups, entry) { + if (strncmp(active->apn_oi_str, lookup->apn_oi_str, + sizeof(lookup->apn_oi_str)) == 0) { + LOGP(DGTPHUB, LOGL_DEBUG, + "Query already pending for %s\n", + lookup->apn_oi_str); + /* A query already pending. Just tip our hat. */ + return NULL; + } + } + + struct gtphub_resolved_ggsn *resolved; + llist_for_each_entry(resolved, &hub->resolved_ggsns, entry) { + if (strncmp(resolved->apn_oi_str, lookup->apn_oi_str, + sizeof(lookup->apn_oi_str)) == 0) { + LOGP(DGTPHUB, LOGL_DEBUG, + "GGSN resolved from cache: %s -> %s\n", + lookup->apn_oi_str, + gtphub_port_str(resolved->peer)); + return resolved->peer; + } + } + + /* Kick off a resolution, but so far return nothing. The hope is that + * the peer will resend the request (a couple of times), and by then + * the GGSN will be resolved. */ + LOGP(DGTPHUB, LOGL_DEBUG, + "Sending out DNS query for %s..." + " (Returning failure, hoping for a retry once resolution" + " has concluded)\n", + lookup->apn_oi_str); + + llist_add(&lookup->entry, &hub->ggsn_lookups); + + lookup->expiry_entry.del_cb = ggsn_lookup_del_cb; + expiry_add(&hub->expire_quickly, &lookup->expiry_entry, gtphub_now()); + + start_ares_query(lookup); + + return NULL; +} diff --git a/src/gtphub/gtphub_main.c b/src/gtphub/gtphub_main.c new file mode 100644 index 000000000..f693f0993 --- /dev/null +++ b/src/gtphub/gtphub_main.c @@ -0,0 +1,403 @@ +/* GTP Hub main program */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Neels Hofmeyr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include +#include +#include + +#define _GNU_SOURCE +#include + +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + +#include "../../bscconfig.h" + +#if BUILD_IU +#include +#endif + +extern void *osmo_gtphub_ctx; +void *tall_sgsn_ctx; + +const char *gtphub_copyright = + "Copyright (C) 2015 sysmocom s.f.m.c GmbH \r\n" + "License AGPLv3+: GNU AGPL version 2 or later \r\n" + "This is free software: you are free to change and redistribute it.\r\n" + "There is NO WARRANTY, to the extent permitted by law.\r\n"; + +static struct log_info_cat gtphub_categories[] = { + [DGTPHUB] = { + .name = "DGTPHUB", + .description = "GTP Hub", + .color = "\033[1;33m", + .enabled = 1, + .loglevel = LOGL_INFO, + }, +}; + +int gtphub_log_filter_fn(const struct log_context *ctx, + struct log_target *tar) +{ + return 0; +} + +static const struct log_info gtphub_log_info = { + .filter_fn = gtphub_log_filter_fn, + .cat = gtphub_categories, + .num_cat = ARRAY_SIZE(gtphub_categories), +}; + +void log_cfg(struct gtphub_cfg *cfg) +{ + int side_idx, plane_idx; + for_each_side_and_plane(side_idx, plane_idx) { + struct gtphub_cfg_addr *a; + a = &cfg->to_gsns[side_idx][plane_idx].bind; + LOGP(DGTPHUB, LOGL_NOTICE, + "to-%ss bind, %s: %s port %d\n", + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + a->addr_str, a->port); + } +} + +static void signal_handler(int signal) +{ + fprintf(stdout, "signal %d received\n", signal); + + switch (signal) { + case SIGINT: + case SIGTERM: + osmo_signal_dispatch(SS_L_GLOBAL, S_L_GLOBAL_SHUTDOWN, NULL); + sleep(1); + exit(0); + break; + case SIGABRT: + /* in case of abort, we want to obtain a talloc report + * and then return to the caller, who will abort the process */ + case SIGUSR1: + case SIGUSR2: + talloc_report_full(osmo_gtphub_ctx, stderr); + break; + default: + break; + } +} + +#if BUILD_IU +int gtphub_vty_go_parent(struct vty *vty) +{ + switch (vty->node) { + default: + osmo_ss7_vty_go_parent(vty); + } + + return vty->node; +} +#endif + +int gtphub_vty_is_config_node(struct vty *vty, int node) +{ + /* Check if libosmo-sccp declares the node in + * question as config node */ +#if BUILD_IU + if (osmo_ss7_is_config_node(vty, node)) + return 1; +#endif + + switch (node) { + /* add items that are not config */ + case CONFIG_NODE: + return 0; + + default: + return 1; + } +} + +static struct vty_app_info vty_info = { + .name = "OsmoGTPhub", + .version = PACKAGE_VERSION, +#if BUILD_IU + .go_parent_cb = gtphub_vty_go_parent, +#endif + .is_config_node = gtphub_vty_is_config_node, +}; + +struct cmdline_cfg { + const char *config_file; + const char *restart_counter_file; + int daemonize; +}; + +static uint8_t next_restart_count(const char *path) +{ + int umask_was = umask(022); + + uint8_t counter = 0; + + FILE *f = fopen(path, "r"); + if (f) { + int rc = fscanf(f, "%hhu", &counter); + + if (rc != 1) + goto failed_to_read; + + char c; + while (fread(&c, 1, 1, f) > 0) { + switch (c) { + case ' ': + case '\t': + case '\n': + case '\r': + break; + default: + goto failed_to_read; + } + } + fclose(f); + } + + counter ++; + + f = fopen(path, "w"); + if (!f) + goto failed_to_write; + if (fprintf(f, "%" PRIu8 "\n", counter) < 2) + goto failed_to_write; + if (fclose(f)) { + f = NULL; + goto failed_to_write; + } + + umask(umask_was); + + LOGP(DGTPHUB, LOGL_NOTICE, "Restarted with counter %hhu\n", counter); + return counter; + +failed_to_read: + fclose(f); + umask(umask_was); + LOGP(DGTPHUB, LOGL_FATAL, "Restart counter file cannot be parsed:" + " %s\n", path); + exit(1); + +failed_to_write: + if (f) + fclose(f); + umask(umask_was); + LOGP(DGTPHUB, LOGL_FATAL, "Restart counter file cannot be written:" + " %s\n", path); + exit(1); +} + +static void print_help(struct cmdline_cfg *ccfg) +{ + printf("gtphub commandline options\n"); + printf(" -h,--help This text.\n"); + printf(" -D,--daemonize Fork the process into a background daemon.\n"); + printf(" -d,--debug Enable Debugging for this category.\n"); + printf(" Pass '-d list' to get a category listing.\n"); + printf(" -s,--disable-color\n"); + printf(" -c,--config-file The config file to use [%s].\n", + ccfg->config_file); + printf(" -e,--log-level Set a global log level.\n"); + printf(" -r,--restart-file File for counting restarts [%s].\n", + ccfg->restart_counter_file); + printf(" -V,--version Print the version.\n"); +} + +static void list_categories(void) +{ + printf("Available debug categories:\n"); + int i; + for (i = 0; i < gtphub_log_info.num_cat; ++i) { + if (!gtphub_log_info.cat[i].name) + continue; + + printf("%s\n", gtphub_log_info.cat[i].name); + } +} + +static void handle_options(struct cmdline_cfg *ccfg, int argc, char **argv) +{ + while (1) { + int option_index = 0, c; + static struct option long_options[] = { + {"help", 0, 0, 'h'}, + {"debug", 1, 0, 'd'}, + {"daemonize", 0, 0, 'D'}, + {"config-file", 1, 0, 'c'}, + {"disable-color", 0, 0, 's'}, + {"timestamp", 0, 0, 'T'}, + {"log-level", 1, 0, 'e'}, + {"restart-file", 1, 0, 'r'}, + { "version", 0, 0, 'V' }, + {NULL, 0, 0, 0} + }; + + c = getopt_long(argc, argv, "hd:Dc:sTe:r:V", + long_options, &option_index); + if (c == -1) { + if (optind < argc) { + LOGP(DGTPHUB, LOGL_FATAL, + "Excess commandline arguments ('%s').\n", + argv[optind]); + exit(2); + } + break; + } + + switch (c) { + case 'h': + //print_usage(); + print_help(ccfg); + exit(0); + case 's': + log_set_use_color(osmo_stderr_target, 0); + break; + case 'd': + if (strcmp("list", optarg) == 0) { + list_categories(); + exit(0); + } else + log_parse_category_mask(osmo_stderr_target, optarg); + break; + case 'D': + ccfg->daemonize = 1; + break; + case 'c': + ccfg->config_file = optarg; + break; + case 'T': + log_set_print_timestamp(osmo_stderr_target, 1); + break; + case 'e': + log_set_log_level(osmo_stderr_target, atoi(optarg)); + break; + case 'r': + ccfg->restart_counter_file = optarg; + break; + case 'V': + print_version(1); + exit(EXIT_SUCCESS); + break; + default: + LOGP(DGTPHUB, LOGL_FATAL, "Invalid command line argument, abort.\n"); + exit(1); + break; + } + } +} + +int main(int argc, char **argv) +{ + int rc; + + struct cmdline_cfg _ccfg; + struct cmdline_cfg *ccfg = &_ccfg; + memset(ccfg, '\0', sizeof(*ccfg)); + ccfg->config_file = "./gtphub.conf"; + ccfg->restart_counter_file = "./gtphub_restart_count"; + + struct gtphub_cfg _cfg; + struct gtphub_cfg *cfg = &_cfg; + memset(cfg, '\0', sizeof(*cfg)); + + struct gtphub _hub; + struct gtphub *hub = &_hub; + + osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub"); + msgb_talloc_ctx_init(osmo_gtphub_ctx, 0); + vty_info.tall_ctx = osmo_gtphub_ctx; + + signal(SIGINT, &signal_handler); + signal(SIGTERM, &signal_handler); + signal(SIGABRT, &signal_handler); + signal(SIGUSR1, &signal_handler); + signal(SIGUSR2, &signal_handler); + osmo_init_ignore_signals(); + + osmo_init_logging2(osmo_gtphub_ctx, >phub_log_info); + + vty_info.copyright = gtphub_copyright; + vty_init(&vty_info); + logging_vty_add_cmds(); + osmo_talloc_vty_add_cmds(); + gtphub_vty_init(hub, cfg); + + rate_ctr_init(osmo_gtphub_ctx); + + handle_options(ccfg, argc, argv); + + rc = gtphub_cfg_read(cfg, ccfg->config_file); + if (rc < 0) { + LOGP(DGTPHUB, LOGL_FATAL, "Cannot parse config file '%s'\n", + ccfg->config_file); + exit(2); + } + + /* start telnet after reading config for vty_get_bind_addr() */ + rc = telnet_init_dynif(osmo_gtphub_ctx, 0, vty_get_bind_addr(), + OSMO_VTY_PORT_GTPHUB); + if (rc < 0) + exit(1); + + if (gtphub_start(hub, cfg, + next_restart_count(ccfg->restart_counter_file)) + != 0) + return -1; + + log_cfg(cfg); + + if (ccfg->daemonize) { + rc = osmo_daemonize(); + if (rc < 0) { + LOGP(DGTPHUB, LOGL_FATAL, "Error during daemonize"); + exit(1); + } + } + + while (1) { + rc = osmo_select_main(0); + if (rc < 0) + exit(3); + } + + /* not reached */ + exit(0); +} diff --git a/src/gtphub/gtphub_sock.c b/src/gtphub/gtphub_sock.c new file mode 100644 index 000000000..1acd5a624 --- /dev/null +++ b/src/gtphub/gtphub_sock.c @@ -0,0 +1,60 @@ +/* GTP Hub Implementation */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * gtphub_sock.c. + * + * This file is kept separate so that these functions can be wrapped for + * gtphub_test.c. When a function and its callers are in the same compilational + * unit, the wrappability may be optimized away. + * + * Author: Neels Hofmeyr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + */ + +#include +#include + +/* Convenience makro, note: only within this C file. */ +#define LOG(level, fmt, args...) \ + LOGP(DGTPHUB, level, fmt, ##args) + +int gtphub_write(const struct osmo_fd *to, + const struct osmo_sockaddr *to_addr, + const uint8_t *buf, size_t buf_len) +{ + errno = 0; + ssize_t sent = sendto(to->fd, buf, buf_len, 0, + (struct sockaddr*)&to_addr->a, to_addr->l); + LOG(LOGL_DEBUG, "to %s\n", osmo_sockaddr_to_str(to_addr)); + + if (sent == -1) { + LOG(LOGL_ERROR, "error: %s\n", strerror(errno)); + return -EINVAL; + } + + if (sent != buf_len) + LOG(LOGL_ERROR, "sent(%d) != data_len(%d)\n", + (int)sent, (int)buf_len); + else + LOG(LOGL_DEBUG, "Sent %d: %s%s\n", + (int)sent, + osmo_hexdump(buf, sent > 1000? 1000 : sent), + sent > 1000 ? "..." : ""); + + return 0; +} + diff --git a/src/gtphub/gtphub_vty.c b/src/gtphub/gtphub_vty.c new file mode 100644 index 000000000..abc08fd69 --- /dev/null +++ b/src/gtphub/gtphub_vty.c @@ -0,0 +1,613 @@ +/* (C) 2015 by sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Neels Hofmeyr + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU Affero General Public License as published by + * the Free Software Foundation; either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Affero General Public License for more details. + * + * You should have received a copy of the GNU Affero General Public License + * along with this program. If not, see . + * + */ + +#include +#include + +#include +#include +#include +#include + +#include +#include +#include + +#include +#include + +/* TODO split GRX ares from sgsn into a separate struct and allow use without + * globals. */ +#include +extern struct sgsn_instance *sgsn; +extern void *tall_sgsn_ctx; + +static struct gtphub *g_hub = 0; +static struct gtphub_cfg *g_cfg = 0; + +static struct cmd_node gtphub_node = { + GTPHUB_NODE, + "%s(config-gtphub)# ", + 1, +}; + +#define GTPH_DEFAULT_CONTROL_PORT 2123 +#define GTPH_DEFAULT_USER_PORT 2152 + +static void write_addrs(struct vty *vty, const char *name, + struct gtphub_cfg_addr *c, struct gtphub_cfg_addr *u) +{ + if ((c->port == GTPH_DEFAULT_CONTROL_PORT) + && (u->port == GTPH_DEFAULT_USER_PORT) + && (strcmp(c->addr_str, u->addr_str) == 0)) { + /* Default port numbers and same IP address: write "short" + * variant. */ + vty_out(vty, " %s %s%s", + name, + c->addr_str, + VTY_NEWLINE); + return; + } + + vty_out(vty, " %s ctrl %s %d user %s %d%s", + name, + c->addr_str, (int)c->port, + u->addr_str, (int)u->port, + VTY_NEWLINE); + + struct ares_addr_node *server; + for (server = sgsn->ares_servers; server; server = server->next) + vty_out(vty, " grx-dns-add %s%s", inet_ntoa(server->addr.addr4), VTY_NEWLINE); +} + +static int config_write_gtphub(struct vty *vty) +{ + vty_out(vty, "gtphub%s", VTY_NEWLINE); + + write_addrs(vty, "bind-to-sgsns", + &g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind, + &g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind); + + write_addrs(vty, "bind-to-ggsns", + &g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind, + &g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind); + + if (g_cfg->sgsn_use_sender) { + vty_out(vty, "sgsn-use-sender%s", VTY_NEWLINE); + } + + if (g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str) { + write_addrs(vty, "sgsn-proxy", + &g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL], + &g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER]); + } + + if (g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str) { + write_addrs(vty, "ggsn-proxy", + &g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL], + &g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER]); + } + + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub, cfg_gtphub_cmd, + "gtphub", + "Configure the GTP hub\n") +{ + vty->node = GTPHUB_NODE; + return CMD_SUCCESS; +} + +#define BIND_ARGS "ctrl ADDR <0-65535> user ADDR <0-65535>" +#define BIND_DOCS \ + "Set GTP-C bind\n" \ + "GTP-C local IP address (v4 or v6)\n" \ + "GTP-C local port\n" \ + "Set GTP-U bind\n" \ + "GTP-U local IP address (v4 or v6)\n" \ + "GTP-U local port\n" + + +DEFUN(cfg_gtphub_bind_to_sgsns_short, cfg_gtphub_bind_to_sgsns_short_cmd, + "bind-to-sgsns ADDR", + "GTP Hub Parameters\n" + "Set the local bind address to listen for SGSNs, for both GTP-C and GTP-U\n" + "Local IP address (v4 or v6)\n" + ) +{ + int i; + for_each_plane(i) + g_cfg->to_gsns[GTPH_SIDE_SGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->to_gsns[GTPH_SIDE_SGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT; + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_bind_to_ggsns_short, cfg_gtphub_bind_to_ggsns_short_cmd, + "bind-to-ggsns ADDR", + "GTP Hub Parameters\n" + "Set the local bind address to listen for GGSNs, for both GTP-C and GTP-U\n" + "Local IP address (v4 or v6)\n" + ) +{ + int i; + for_each_plane(i) + g_cfg->to_gsns[GTPH_SIDE_GGSN][i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->to_gsns[GTPH_SIDE_GGSN][GTPH_PLANE_USER].bind.port = GTPH_DEFAULT_USER_PORT; + return CMD_SUCCESS; +} + + +static int handle_binds(struct gtphub_cfg_bind *b, const char **argv) +{ + b[GTPH_PLANE_CTRL].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + b[GTPH_PLANE_CTRL].bind.port = atoi(argv[1]); + b[GTPH_PLANE_USER].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[2]); + b[GTPH_PLANE_USER].bind.port = atoi(argv[3]); + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_bind_to_sgsns, cfg_gtphub_bind_to_sgsns_cmd, + "bind-to-sgsns " BIND_ARGS, + "GTP Hub Parameters\n" + "Set the local bind addresses and ports to listen for SGSNs\n" + BIND_DOCS + ) +{ + return handle_binds(g_cfg->to_gsns[GTPH_SIDE_SGSN], argv); +} + +DEFUN(cfg_gtphub_bind_to_ggsns, cfg_gtphub_bind_to_ggsns_cmd, + "bind-to-ggsns " BIND_ARGS, + "GTP Hub Parameters\n" + "Set the local bind addresses and ports to listen for GGSNs\n" + BIND_DOCS + ) +{ + return handle_binds(g_cfg->to_gsns[GTPH_SIDE_GGSN], argv); +} + +DEFUN(cfg_gtphub_ggsn_proxy_short, cfg_gtphub_ggsn_proxy_short_cmd, + "ggsn-proxy ADDR", + "GTP Hub Parameters\n" + "Redirect all GGSN bound traffic to default ports on this address (another gtphub)\n" + "Remote IP address (v4 or v6)\n" + ) +{ + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT; + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_ggsn_proxy, cfg_gtphub_ggsn_proxy_cmd, + "ggsn-proxy " BIND_ARGS, + "GTP Hub Parameters\n" + "Redirect all GGSN bound traffic to these addresses and ports (another gtphub)\n" + BIND_DOCS + ) +{ + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]); + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); + g_cfg->proxy[GTPH_SIDE_GGSN][GTPH_PLANE_USER].port = atoi(argv[3]); + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_sgsn_proxy_short, cfg_gtphub_sgsn_proxy_short_cmd, + "sgsn-proxy ADDR", + "GTP Hub Parameters\n" + "Redirect all SGSN bound traffic to default ports on this address (another gtphub)\n" + "Remote IP address (v4 or v6)\n" + ) +{ + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = GTPH_DEFAULT_USER_PORT; + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_sgsn_proxy, cfg_gtphub_sgsn_proxy_cmd, + "sgsn-proxy " BIND_ARGS, + "GTP Hub Parameters\n" + "Redirect all SGSN bound traffic to these addresses and ports (another gtphub)\n" + BIND_DOCS + ) +{ + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_CTRL].port = atoi(argv[1]); + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); + g_cfg->proxy[GTPH_SIDE_SGSN][GTPH_PLANE_USER].port = atoi(argv[3]); + return CMD_SUCCESS; +} + + +#define SGSN_USE_SENDER_STR \ + "Ignore SGSN's Address IEs, use sender address and port (useful over NAT)\n" + +DEFUN(cfg_gtphub_sgsn_use_sender, + cfg_gtphub_sgsn_use_sender_cmd, + "sgsn-use-sender", + SGSN_USE_SENDER_STR) +{ + g_cfg->sgsn_use_sender = 1; + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub_no_sgsn_use_sender, + cfg_gtphub_no_sgsn_use_sender_cmd, + "no sgsn-use-sender", + NO_STR SGSN_USE_SENDER_STR) +{ + g_cfg->sgsn_use_sender = 0; + return CMD_SUCCESS; +} + + +/* Copied from sgsn_vty.h */ +DEFUN(cfg_grx_ggsn, cfg_grx_ggsn_cmd, + "grx-dns-add A.B.C.D", + "Add DNS server\nIPv4 address\n") +{ + struct ares_addr_node *node = talloc_zero(tall_sgsn_ctx, struct ares_addr_node); + node->family = AF_INET; + inet_aton(argv[0], &node->addr.addr4); + + node->next = sgsn->ares_servers; + sgsn->ares_servers = node; + return CMD_SUCCESS; +} + + +static void show_bind_stats_all(struct vty *vty) +{ + int plane_idx; + for_each_plane(plane_idx) { + vty_out(vty, "- %s Plane:%s", + gtphub_plane_idx_names[plane_idx], VTY_NEWLINE); + + int side_idx; + for_each_side(side_idx) { + struct gtphub_bind *b = &g_hub->to_gsns[side_idx][plane_idx]; + vty_out(vty, " - local addr to/from %ss: %s port %d%s", + gtphub_side_idx_names[side_idx], + gsn_addr_to_str(&b->local_addr), (int)b->local_port, + VTY_NEWLINE); + vty_out_rate_ctr_group(vty, " ", b->counters_io); + } + } +} + +static void show_tunnel_stats(struct vty *vty, struct gtphub_tunnel *tun) +{ + int plane_idx; + for_each_plane(plane_idx) { + vty_out(vty, "- %s Plane:%s", + gtphub_plane_idx_names[plane_idx], VTY_NEWLINE); + + int side_idx; + for_each_side(side_idx) { + struct gtphub_tunnel_endpoint *te = &tun->endpoint[side_idx][plane_idx]; + vty_out(vty, " - to/from %s:%s", + gtphub_side_idx_names[side_idx], + VTY_NEWLINE); + vty_out_rate_ctr_group(vty, " ", te->counters_io); + } + } +} + +static void show_peer_summary(struct vty *vty, const char *prefix, + int side_idx, int plane_idx, + struct gtphub_peer *p, int with_io_stats) +{ + struct gtphub_peer_addr *pa; + int p2l = strlen(prefix) + 4 + 1; + char prefix2[p2l]; + memset(prefix2, ' ', p2l - 1); + prefix2[p2l - 1] = '\0'; + + if (with_io_stats) { + llist_for_each_entry(pa, &p->addresses, entry) { + vty_out(vty, "%s- %s %s %s%s", prefix, + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + gsn_addr_to_str(&pa->addr), + VTY_NEWLINE); + + + struct gtphub_peer_port *pp; + llist_for_each_entry(pp, &pa->ports, entry) { + vty_out(vty, "%s Port %" PRIu16 "%s", prefix, pp->port, VTY_NEWLINE); + vty_out_rate_ctr_group(vty, prefix2, pp->counters_io); + } + } + } else { + llist_for_each_entry(pa, &p->addresses, entry) { + vty_out(vty, "%s- %s %s %s", prefix, + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + gsn_addr_to_str(&pa->addr)); + struct gtphub_peer_port *pp; + llist_for_each_entry(pp, &pa->ports, entry) { + vty_out(vty, ":%" PRIu16, pp->port); + } + vty_out(vty, VTY_NEWLINE); + } + } +} + +static void show_peers_summary(struct vty *vty) +{ + int side_idx; + int plane_idx; + + int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}}; + + for_each_side(side_idx) { + for_each_plane(plane_idx) { + struct gtphub_peer *p; + llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) { + count[side_idx][plane_idx] ++; + } + } + } + + vty_out(vty, "Peers Count:%s", VTY_NEWLINE); + for_each_side_and_plane(side_idx, plane_idx) { + vty_out(vty, " %s %s peers: %d%s", + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + count[side_idx][plane_idx], + VTY_NEWLINE); + } +} + +static void show_peers_all(struct vty *vty, int with_io_stats) +{ + int side_idx; + int plane_idx; + + int count[GTPH_SIDE_N][GTPH_PLANE_N] = {{0}}; + + vty_out(vty, "All Peers%s%s", + with_io_stats? " with I/O stats" : "", + VTY_NEWLINE); + for_each_side(side_idx) { + vty_out(vty, "- %s%s", gtphub_side_idx_names[side_idx], VTY_NEWLINE); + for_each_plane(plane_idx) { + struct gtphub_peer *p; + llist_for_each_entry(p, &g_hub->to_gsns[side_idx][plane_idx].peers, entry) { + count[side_idx][plane_idx] ++; + show_peer_summary(vty, " ", side_idx, plane_idx, p, with_io_stats); + } + } + } + for_each_side_and_plane(side_idx, plane_idx) { + vty_out(vty, "%s %s peers: %d%s", + gtphub_side_idx_names[side_idx], + gtphub_plane_idx_names[plane_idx], + count[side_idx][plane_idx], + VTY_NEWLINE); + } +} + + +static void show_tunnels_summary(struct vty *vty) +{ + time_t now = gtphub_now(); + + const int w = 36; + int max_expiry = g_hub->expire_slowly.expiry_in_seconds; + float seconds_per_step = ((float)max_expiry) / w; + + /* Print TEI mapping expiry in an ASCII histogram, like: + TEI map summary + Legend: '_'=0 '.'<=1% ':'<=2% '|'<=10% '#'>10% (10.0 m/step) + CTRL: 30 mappings, valid for 360m[# :. | . : . ]1m + USER: 30 mappings, valid for 360m[# :. | . : . ]1m + 4 TEI mappings in total, last expiry in 359.4 min + */ + vty_out(vty, + "Tunnels summary%s" + " Legend: ' '=0 '.'<=1%% ':'<=2%% '|'<=10%% '#'>10%% (%.1f m/step)%s", + VTY_NEWLINE, + seconds_per_step / 60., + VTY_NEWLINE); + + int last_expiry = 0; + + unsigned int count = 0; + + int histogram[w]; + memset(histogram, 0, sizeof(histogram)); + + struct gtphub_tunnel *t; + llist_for_each_entry(t, &g_hub->tunnels, entry) { + count ++; + int expiry = t->expiry_entry.expiry - now; + last_expiry = (last_expiry > expiry) ? last_expiry : expiry; + + int hi = ((float)expiry) / seconds_per_step; + if (hi < 0) + hi = 0; + if (hi > (w - 1)) + hi = w - 1; + histogram[hi] ++; + } + + vty_out(vty, + " %u tunnels, valid for %dm[", + count, max_expiry / 60); + + int i; + for (i = w - 1; i >= 0; i--) { + char c; + int val = histogram[i]; + int percent = 100. * val / count; + if (!val) + c = ' '; + else if (percent <= 1) + c = '.'; + else if (percent <= 2) + c = ':'; + else if (percent <= 10) + c = '|'; + else c = '#'; + vty_out(vty, "%c", c); + } + vty_out(vty, "]1m%s", VTY_NEWLINE); + + vty_out(vty, " last expiry in %.1f min%s", + ((float)last_expiry) / 60., + VTY_NEWLINE); +} + +static void show_tunnels_all(struct vty *vty, int with_io_stats) +{ + time_t now = gtphub_now(); + + vty_out(vty, "All tunnels%s:%s" + "Legend: TEI=: SGSN <-> GGSN (expiry in minutes), with each:%s" + " [/] (TEI C= U=)%s", + with_io_stats? "with I/O stats" : "", + VTY_NEWLINE, VTY_NEWLINE, VTY_NEWLINE); + + unsigned int count = 0; + unsigned int incomplete = 0; + struct gtphub_tunnel *tun; + llist_for_each_entry(tun, &g_hub->tunnels, entry) { + vty_out(vty, + "%s (expiry in %dm)%s", + gtphub_tunnel_str(tun), + (int)((tun->expiry_entry.expiry - now) / 60), + VTY_NEWLINE); + count ++; + if (!gtphub_tunnel_complete(tun)) + incomplete ++; + if (with_io_stats) + show_tunnel_stats(vty, tun); + } + vty_out(vty, "Total: %u tunnels (of which %u incomplete)%s", + count, incomplete, VTY_NEWLINE); +} + +#define SHOW_GTPHUB_STRS SHOW_STR "Show info on running GTP hub\n" +#define SHOW_GTPHUB_PEERS_STRS SHOW_GTPHUB_STRS "Active peers\n" +#define SHOW_GTPHUB_TUNS_STRS SHOW_GTPHUB_STRS "Active tunnels\n" + +DEFUN(show_gtphub_peers_summary, show_gtphub_peers_summary_cmd, "show gtphub peers summary", + SHOW_GTPHUB_PEERS_STRS "Summary of all peers\n") +{ + show_peers_summary(vty); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub_peers_list, show_gtphub_peers_list_cmd, "show gtphub peers list", + SHOW_GTPHUB_PEERS_STRS "List all peers\n") +{ + show_peers_all(vty, 0); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub_peers_stats, show_gtphub_peers_stats_cmd, "show gtphub peers stats", + SHOW_GTPHUB_PEERS_STRS "List all peers with I/O stats\n") +{ + show_peers_all(vty, 1); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub_tunnels_summary, show_gtphub_tunnels_summary_cmd, "show gtphub tunnels summary", + SHOW_GTPHUB_TUNS_STRS "Summary of all tunnels\n") +{ + show_tunnels_summary(vty); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub_tunnels_list, show_gtphub_tunnels_list_cmd, "show gtphub tunnels list", + SHOW_GTPHUB_TUNS_STRS "List all tunnels\n") +{ + show_tunnels_all(vty, 0); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub_tunnels_stats, show_gtphub_tunnels_stats_cmd, "show gtphub tunnels stats", + SHOW_GTPHUB_TUNS_STRS "List all tunnels with I/O stats\n") +{ + show_tunnels_all(vty, 1); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub, show_gtphub_cmd, "show gtphub all", + SHOW_GTPHUB_STRS "Summarize everything about the GTP hub\n") +{ + show_bind_stats_all(vty); + show_peers_summary(vty); + show_tunnels_summary(vty); + return CMD_SUCCESS; +} + + +int gtphub_vty_init(struct gtphub *global_hub, struct gtphub_cfg *global_cfg) +{ + g_hub = global_hub; + g_cfg = global_cfg; + + install_element_ve(&show_gtphub_cmd); + install_element_ve(&show_gtphub_peers_summary_cmd); + install_element_ve(&show_gtphub_peers_list_cmd); + install_element_ve(&show_gtphub_peers_stats_cmd); + install_element_ve(&show_gtphub_tunnels_summary_cmd); + install_element_ve(&show_gtphub_tunnels_list_cmd); + install_element_ve(&show_gtphub_tunnels_stats_cmd); + + install_element(CONFIG_NODE, &cfg_gtphub_cmd); + install_node(>phub_node, config_write_gtphub); + + install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_short_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_sgsns_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_short_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_bind_to_ggsns_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_short_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_ggsn_proxy_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_short_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_proxy_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_sgsn_use_sender_cmd); + install_element(GTPHUB_NODE, &cfg_gtphub_no_sgsn_use_sender_cmd); + install_element(GTPHUB_NODE, &cfg_grx_ggsn_cmd); + + return 0; +} + +int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file) +{ + int rc; + + rc = vty_read_config_file(config_file, NULL); + if (rc < 0) { + fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file); + return rc; + } + + return 0; +} diff --git a/tests/gtphub/Makefile.am b/tests/gtphub/Makefile.am index 523df61d7..fea01e0d1 100644 --- a/tests/gtphub/Makefile.am +++ b/tests/gtphub/Makefile.am @@ -31,7 +31,7 @@ gtphub_test_LDFLAGS = \ $(NULL) gtphub_test_LDADD = \ - $(top_builddir)/src/gprs/gtphub.o \ + $(top_builddir)/src/gtphub/gtphub.o \ $(top_builddir)/src/gprs/gprs_utils.o \ $(LIBOSMOCORE_LIBS) \ $(LIBOSMOGSM_LIBS) \ -- cgit v1.2.3