diff options
author | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2015-09-24 17:32:30 +0200 |
---|---|---|
committer | Neels Hofmeyr <nhofmeyr@sysmocom.de> | 2015-11-16 15:16:26 +0100 |
commit | c8a614d2e9c56fe13c22f239be82f2a2c958e039 (patch) | |
tree | ce820c172725b3072ed106ea2c233df108b8ef1d /openbsc/src | |
parent | 65482c919f82b28aa53cd519c4f7799b104051c0 (diff) |
Add GTP hub initial code base.
First steps towards a new GTP hub. The aim is to mux GTP connections, so that
multiple SGSN <--> GGSN links can pass through a single point. Background:
allow having more than one SGSN, possibly in various remote locations.
The recent addition of OAP to GSUP is related to the same background idea.
(This is a collapsed patch of various changes that do not make sense to review
in chronological order anymore, since a lot of it has thorougly transmorphed
after it was first committed.)
Sponsored-by: On-Waves ehf
Diffstat (limited to 'openbsc/src')
-rw-r--r-- | openbsc/src/gprs/Makefile.am | 6 | ||||
-rw-r--r-- | openbsc/src/gprs/gtphub.c | 2080 | ||||
-rw-r--r-- | openbsc/src/gprs/gtphub_ext.c | 58 | ||||
-rw-r--r-- | openbsc/src/gprs/gtphub_main.c | 282 | ||||
-rw-r--r-- | openbsc/src/gprs/gtphub_vty.c | 258 |
5 files changed, 2684 insertions, 0 deletions
diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am index c8e3696dc..0dd38f99c 100644 --- a/openbsc/src/gprs/Makefile.am +++ b/openbsc/src/gprs/Makefile.am @@ -11,6 +11,7 @@ noinst_HEADERS = gprs_sndcp.h bin_PROGRAMS = osmo-gbproxy if HAVE_LIBGTP +bin_PROGRAMS += osmo-gtphub if HAVE_LIBCARES bin_PROGRAMS += osmo-sgsn endif @@ -33,3 +34,8 @@ osmo_sgsn_LDADD = \ $(top_builddir)/src/libcommon/libcommon.a \ -lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) \ $(LIBCRYPTO_LIBS) -lrt + +osmo_gtphub_SOURCES = gtphub_main.c gtphub.c gtphub_ext.c gtphub_vty.c +osmo_gtphub_LDADD = \ + $(top_builddir)/src/libcommon/libcommon.a \ + -lgtp $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS) -lrt diff --git a/openbsc/src/gprs/gtphub.c b/openbsc/src/gprs/gtphub.c new file mode 100644 index 000000000..440f00fe3 --- /dev/null +++ b/openbsc/src/gprs/gtphub.c @@ -0,0 +1,2080 @@ +/* GTP Hub Implementation */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <string.h> +#include <errno.h> +#include <inttypes.h> +#include <time.h> +#include <limits.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <gtp.h> +#include <gtpie.h> + +#include <openbsc/gtphub.h> +#include <openbsc/debug.h> + +#include <osmocom/core/utils.h> +#include <osmocom/core/logging.h> +#include <osmocom/core/socket.h> + +#define GTPHUB_DEBUG 1 + +static const int GTPH_GC_TICK_SECONDS = 1; + +void *osmo_gtphub_ctx; + +#define LOGERR(fmt, args...) \ + LOGP(DGTPHUB, LOGL_ERROR, fmt, ##args) + +#define LOG(fmt, args...) \ + LOGP(DGTPHUB, LOGL_NOTICE, 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) + +/* 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 = 2, /* a real packet with IEs */ + + 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; + int rc; /* enum gtp_rc */ + unsigned int plane_idx; + union gtpie_member *ie[GTPIE_SIZE]; +}; + +void gsn_addr_copy(struct gsn_addr *gsna, const struct gsn_addr *src) +{ + memcpy(gsna, src, sizeof(struct gsn_addr)); +} + +/* Decode sa to gsna. Return 0 on success. If port is non-NULL, the port number + * from sa is also returned. */ +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) +{ + 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) { + LOGERR("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) { + LOGERR("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) + 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) + 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("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) { + LOGERR("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 = 0; /* TODO */ + + 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)) { + LOGERR("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("GTP v0 TID = %" PRIu64 "\n", pheader->tid); + p->header_len = GTP0_HEADER_SIZE; + p->rc = GTP_RC_PDU; +} + +/* 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)){ + LOGERR("GTP packet too short: %d\n", p->data_len); + p->rc = GTP_RC_TOOSHORT; + return; + } + + p->type = ntoh8(pheader->type); + p->header_tei = ntoh32(pheader->tei); + p->seq = ntoh16(pheader->seq); + + LOG("|GTPv1\n"); + LOG("| type = %" PRIu8 " 0x%02" PRIx8 "\n", + p->type, p->type); + LOG("| length = %" PRIu16 " 0x%04" PRIx16 "\n", + ntoh16(pheader->length), ntoh16(pheader->length)); + LOG("| TEI = %" PRIu32 " 0x%08" PRIx32 "\n", + p->header_tei, p->header_tei); + LOG("| seq = %" PRIu16 " 0x%04" PRIx16 "\n", + p->seq, p->seq); + LOG("| npdu = %" PRIu8 " 0x%02" PRIx8 "\n", + pheader->npdu, pheader->npdu); + LOG("| 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 */ + if (p->data_len != (ntoh16(pheader->length) + GTP1_HEADER_SIZE_SHORT)) { + LOGERR("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; + 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) { + LOGERR("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: + LOGERR("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[], uint8_t *imsi, int i) +{ + 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[], uint8_t *nsapi, int i) +{ + 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 const char *imsi_to_str(uint8_t *imsi) +{ + static char str[17]; + int i; + + for (i = 0; i < 8; i++) { + str[2*i] = imsi_digit_to_char(imsi[i]); + str[2*i + 1] = imsi_digit_to_char(imsi[i] >> 4); + } + str[16] = '\0'; + return str; +} + +/* 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_plane_idx, + struct gtp_packet_desc *res) +{ + ZERO_STRUCT(res); + res->data = (union gtp_packet*)data; + res->data_len = data_len; + res->plane_idx = from_plane_idx; + + validate_gtp_header(res); + + if (res->rc <= 0) { + LOGERR("INVALID: dropping GTP packet.\n"); + return; + } + + LOG("Valid GTP header (v%d)\n", res->version); + + if (res->rc != GTP_RC_PDU) { + LOG("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; + return; + } + +#if GTPHUB_DEBUG + int i; + + for (i = 0; i < 10; i++) { + uint8_t imsi[8]; + if (!get_ie_imsi(res->ie, imsi, i)) + break; + LOG("| IMSI %s\n", imsi_to_str(imsi)); + } + + for (i = 0; i < 10; i++) { + uint8_t nsapi; + if (!get_ie_nsapi(res->ie, &nsapi, i)) + break; + LOG("| NSAPI %d\n", (int)nsapi); + } + + for (i = 0; i < 2; i++) { + struct gsn_addr addr; + if (gsn_addr_get(&addr, res, i) == 0) + LOG("| 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("| 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("| 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; + + /* 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 { + LOG("Not expired: %d > %d\n", (int)m->expiry, (int)now); + /* The items are added sorted by expiry. So when we hit + * an unexpired entry, only more unexpired ones will + * follow. */ + break; + } + } + return expired; +} + +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) +{ + *pool = (struct nr_pool){}; +} + +nr_t nr_pool_next(struct nr_pool *pool) +{ + pool->last_nr ++; + + OSMO_ASSERT(pool->last_nr > 0); + /* TODO: gracefully handle running out of TEIs. */ + /* TODO: random TEIs. */ + + 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); + if (map->add_items_to_expiry) + 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, +}; + +time_t gtphub_now(void) +{ + struct timespec now_tp; + OSMO_ASSERT(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) +{ + 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); + talloc_free(pp); +} + +/* From the information in the gtp_packet_desc, return the address of a GGSN. + * Return -1 on error. */ +static struct gtphub_peer_port *gtphub_resolve_ggsn(struct gtphub *hub, + struct gtp_packet_desc *p); + +/* See gtphub_ext.c (wrapped by unit test) */ +int gtphub_resolve_ggsn_addr(struct gtphub *hub, + struct osmo_sockaddr *result, + struct gtp_packet_desc *p); + +static struct gtphub_peer_port *gtphub_port_find(const struct gtphub_bind *bind, + const struct gsn_addr *addr, + uint16_t port); + +static struct gtphub_peer_port *gtphub_port_have(struct gtphub *hub, + struct gtphub_bind *bind, + const struct gsn_addr *addr, + uint16_t port); + +static void gtphub_zero(struct gtphub *hub) +{ + ZERO_STRUCT(hub); +} + +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) { + LOGERR("Cannot bind: empty address.\n"); + return -1; + } + if (!addr->port) { + LOGERR("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) { + LOGERR("Cannot bind to %s port %d (rc %d)\n", + addr->addr_str, (int)addr->port, rc); + return -1; + } + + return 0; +} + +static void gtphub_bind_init(struct gtphub_bind *b) +{ + ZERO_STRUCT(b); + + INIT_LLIST_HEAD(&b->peers); +} + +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) +{ + if (gsn_addr_from_str(&b->local_addr, cfg->bind.addr_str) != 0) + return -1; + if (gtphub_sock_init(&b->ofd, &cfg->bind, cb, cb_data, ofd_id) != 0) + return -1; + return 0; +} + +/* Recv datagram from from->fd, optionally 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) +{ + /* recvfrom requires the available length to be set in *from_addr_len. */ + if (from_addr) + 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) { + if (errno != EAGAIN) + LOGERR("error: %s\n", strerror(errno)); + return 0; + } + + if (from_addr) { + LOG("from %s\n", osmo_sockaddr_to_str(from_addr)); + } + + if (received <= 0) { + LOGERR("error: %s\n", strerror(errno)); + return 0; + } + + LOG("Received %d\n%s\n", (int)received, osmo_hexdump(buf, received)); + return received; +} + +inline void gtphub_port_ref_count_inc(struct gtphub_peer_port *pp) +{ + OSMO_ASSERT(pp->ref_count < UINT_MAX); + pp->ref_count++; +} + +inline void gtphub_port_ref_count_dec(struct gtphub_peer_port *pp) +{ + OSMO_ASSERT(pp->ref_count > 0); + pp->ref_count--; +} + +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; +} + +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; +} + +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_peer_str2(struct gtphub_peer *peer) +{ + static char buf[256]; + return gtphub_peer_strb(peer, buf, sizeof(buf)); +} + +static 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 */ + + 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("expired: %d: nr mapping from %s: %d->%d\n", + (int)nrm->expiry_entry.expiry, + gtphub_port_str(from), + (int)nrm->orig, (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("peer %s: MAP %d --> %d\n", + gtphub_port_str(from), + (int)(nrm->orig), (int)(nrm->repl)); + } else { + /* restart expiry timeout */ + expiry_add(map->add_items_to_expiry, &nrm->expiry_entry, + now); + } + + OSMO_ASSERT(nrm); + return nrm; +} + +static uint32_t gtphub_tei_mapping_have(struct gtphub *hub, + int plane_idx, + struct gtphub_peer_port *from, + uint32_t orig_tei, + time_t now) +{ + struct nr_mapping *nrm = gtphub_mapping_have(&hub->tei_map[plane_idx], + from, orig_tei, now); + LOG("New %s TEI: (from %s, TEI %d) <-- TEI %d\n", + gtphub_plane_idx_names[plane_idx], + gtphub_port_str(from), + (int)orig_tei, (int)nrm->repl); + + return (uint32_t)nrm->repl; +} + +static int gtphub_map_seq(struct gtp_packet_desc *p, + struct gtphub_peer_port *from_port, + struct gtphub_peer_port *to_port, + time_t now) +{ + /* 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, now); + + /* Change the GTP packet to yield the new, mapped seq nr */ + set_seq(p, nrm->repl); + + return 0; +} + +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("peer %p: UNMAP %d <-- %d\n", nrm->origin, (int)(nrm->orig), (int)(nrm->repl)); + set_seq(p, nrm->orig); + return nrm->origin; +} + +static void gtphub_check_restart_counter(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from) +{ + /* TODO */ + /* 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. */ +} + +static void gtphub_map_restart_counter(struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from, + struct gtphub_peer_port *to) +{ + /* TODO */ +} + +/* gtphub_map_ie_teis() and gtphub_unmap_header_tei(): + * + * TEI mapping must happen symmetrically. An SGSN contacts gtphub instead of N + * GGSNs, and a GGSN replies to gtphub for N SGSNs. From either end, TEIs may + * collide: two GGSNs picking the same TEIs, or two SGSNs picking the same + * TEIs. Since the opposite side sees the sender address being gtphub's + * address, TEIs among the SGSNs, and among the GGSNs, must not overlap. If a + * peer sends a TEI already sent before from a peer of the same side, gtphub + * replaces it with a TEI not yet seen from that side and remembers the + * mapping. + * + * Consider two SGSNs A and B contacting two GGSNs C and D thru gtphub. + * + * A: Create PDP Ctx, I have TEI 1. + * ---> gtphub: A has TEI 1, sending 1 for C. + * ---> C: gtphub has TEI 1. + * <--- C: Response to TEI 1: I have TEI 11. + * <--- gtphub: ok, telling A: 11. + * A: gtphub's first TEI is 11. (1) + * + * B: Create PDP Ctx, I have TEIs 1. + * ---> gtphub: 1 already taken for C, sending 2 for B. (map) + * ---> C: gtphub also has 2. + * <--- C: Response to TEI 2: I have TEI 12. + * <--- gtphub: ok, TEI 2 is actually B with TEI 1. (unmap) + * B: gtphub's first TEI is 12, as far as I can tell. + * + * Now the second GGSN comes into play: + * + * A: Create PDP Ctx, I have TEI 2. + * ---> gtphub: A also has TEI 2, but for D, sending 1. (2) + * ---> D: gtphub has 1. + * <--- D: Response to TEI 1: I have TEI 11. + * <--- gtphub: from D, 1 is A. 11 already taken by C, sending 13. (3) + * A: gtphub also has TEI 13. (4) + * + * And some messages routed through: + * + * A: message to TEI 11, see (1). + * ---> gtphub: ok, telling C with TEI 11. + * ---> C: I see, 11 means reply with 1. + * <--- C: Response to TEI 1 + * <--- gtphub: 1 from C is actually for A with TEI 1. + * A: ah, my TEI 1, thanks! + * + * A: message to TEI 13, see (4). + * ---> gtphub: ok, but not 13, D wanted TEI 11 instead, see (3). + * ---> D: I see, 11 means reply with 1. + * <--- D: Response to TEI 1 + * <--- gtphub: 1 from D is actually for A with TEI 2, see (2). + * A: ah, my TEI 2, thanks! + * + * What if a GGSN initiates a request: + * + * <--- D: Request to gtphub TEI 1 + * <--- gtphub: 1 from D is for A with 2, see (2). + * A: my TEI 2 means reply with 13. + * ---> gtphub: 13 was D with 11, see (3). + * ---> D: 11 from gtphub: a reply to my request for TEI 1. + * + * Note that usually, it's the sequence numbers that route a response back to + * the requesting peer. Nevertheless, the TEI mappings must be carried out to + * replace the TEIs in the GTP packet that is relayed. + * + * Also note: the TEI in the GTP header is "reversed" from the TEI in the IEs: + * the TEI in the header is used to send something *to* a peer, while the TEI + * in e.g. a Create PDP Context Request's IE is for routing messages *back* + * later. */ + +static int gtphub_unmap_header_tei(struct gtphub_peer_port **to_port_p, + struct gtphub *hub, + struct gtp_packet_desc *p, + struct gtphub_peer_port *from_port) +{ + OSMO_ASSERT(p->version == 1); + *to_port_p = 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. */ + uint32_t tei = p->header_tei; + if (!tei) + return 0; + + /* to_peer has previously announced a TEI, which was stored and + * mapped in from_peer's tei_map. */ + struct nr_mapping *nrm; + nrm = nr_map_get_inv(&hub->tei_map[p->plane_idx], tei); + if (!nrm) { + LOGERR("Received unknown TEI %" PRIu32 " from %s\n", + tei, gtphub_port_str(from_port)); + return -1; + } + + struct gtphub_peer_port *to_port = nrm->origin; + uint32_t unmapped_tei = nrm->orig; + set_tei(p, unmapped_tei); + + LOG("Unmapped TEI coming from %s: %d -> %d (to %s)\n", + gtphub_port_str(from_port), tei, unmapped_tei, + gtphub_port_str2(to_port)); + + *to_port_p = to_port; + 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_ies(struct gtphub *hub, + struct gtphub_bind from_bind[], + struct gtphub_bind to_bind[], + struct gtp_packet_desc *p, + time_t now) +{ + OSMO_ASSERT(p->plane_idx == GTPH_PLANE_CTRL); + + int rc; + int plane_idx; + + switch (p->type) { + case GTP_CREATE_PDP_REQ: + case GTP_CREATE_PDP_RSP: + /* Go for it below */ + break; + default: + /* Nothing to do for this message type. */ + return 0; + } + + /* TODO enforce a Request only from SGSN, a Response only from GGSN? */ + + osmo_static_assert((GTPH_PLANE_CTRL == 0) && (GTPH_PLANE_USER == 1), + plane_nrs_match_GSN_addr_IE_indices); + + uint8_t ie_type[] = { GTPIE_TEI_C, GTPIE_TEI_DI }; + int ie_mandatory = (p->type == GTP_CREATE_PDP_REQ); + + for (plane_idx = 0; plane_idx < 2; plane_idx++) { + struct gsn_addr addr_from_ie; + uint32_t tei_from_ie; + int ie_idx; + + /* Fetch GSN Address and TEI from IEs */ + rc = gsn_addr_get(&addr_from_ie, p, plane_idx); + if (rc) { + LOGERR("Cannot read %s GSN Address IE\n", + gtphub_plane_idx_names[plane_idx]); + return -1; + } + LOG("Read %s GSN addr %s (%d)\n", + gtphub_plane_idx_names[plane_idx], + gsn_addr_to_str(&addr_from_ie), + addr_from_ie.len); + + ie_idx = gtpie_getie(p->ie, ie_type[plane_idx], 0); + if (ie_idx < 0) { + if (ie_mandatory) { + LOGERR("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 */ + struct gtphub_peer_port *peer_from_ie = + gtphub_port_have(hub, &from_bind[plane_idx], + &addr_from_ie, + gtphub_plane_idx_default_port[plane_idx]); + + if (tei_from_ie) { + /* Create TEI mapping and replace in GTP packet IE */ + uint32_t mapped_tei = + gtphub_tei_mapping_have(hub, plane_idx, + peer_from_ie, + tei_from_ie, + now); + p->ie[ie_idx]->tv4.v = hton32(mapped_tei); + } + + /* Replace the GSN address to reflect gtphub. */ + rc = gsn_addr_put(&to_bind[plane_idx].local_addr, p, plane_idx); + if (rc) { + LOGERR("Cannot write %s GSN Address IE\n", + gtphub_plane_idx_names[plane_idx]); + return -1; + } + } + + return 0; +} + +static 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); + + if (to_addr) { + LOG("to %s\n", osmo_sockaddr_to_str(to_addr)); + } + + if (sent == -1) { + LOGERR("error: %s\n", strerror(errno)); + return -EINVAL; + } + + if (sent != buf_len) + LOGERR("sent(%d) != data_len(%d)\n", (int)sent, (int)buf_len); + else + LOG("Sent %d\n%s\n", (int)sent, osmo_hexdump(buf, sent)); + + return 0; +} + +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("\n\n=== 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; + size_t len; + + len = gtphub_read(from_ggsns_ofd, &from_addr, buf, sizeof(buf)); + if (len < 1) + return 0; + + len = gtphub_from_ggsns_handle_buf(hub, plane_idx, &from_addr, buf, len, + gtphub_now(), + &to_ofd, &to_addr); + if (len < 1) + return 0; + + return gtphub_write(to_ofd, &to_addr, 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, + struct gtphub_peer_port **unmapped_from_tei) +{ + /* 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. */ + + struct gtphub_peer_port *from_seq = NULL; + struct gtphub_peer_port *from_tei = NULL; + struct gtphub_peer_port *unmapped = NULL; + + if (unmapped_from_seq) + *unmapped_from_seq = from_seq; + if (unmapped_from_tei) + *unmapped_from_tei = from_tei; + if (final_unmapped) + *final_unmapped = unmapped; + + from_seq = gtphub_unmap_seq(p, from); + + if (gtphub_unmap_header_tei(&from_tei, hub, p, from) < 0) + return -1; + + struct gtphub_peer *from_peer = from->peer_addr->peer; + if (from_seq && from_tei && (from_seq != from_tei)) { + LOGERR("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), + (int)p->header_tei, + gtphub_port_str2(from_tei) + ); + } + unmapped = (from_seq? from_seq : from_tei); + + if (unmapped && to_proxy && (unmapped != to_proxy)) { + LOGERR("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; + } + + LOG("from seq %p; from tei %p; unmapped => %p\n", + from_seq, from_tei, unmapped); + + if (unmapped_from_seq) + *unmapped_from_seq = from_seq; + if (unmapped_from_tei) + *unmapped_from_tei = from_tei; + 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); +} + +static int gtphub_handle_echo(const struct gtp_packet_desc *p) +{ + /* TODO */ + return 0; +} + +/* 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_from_ggsns_handle_buf(struct gtphub *hub, + unsigned int plane_idx, + const struct osmo_sockaddr *from_addr, + uint8_t *buf, + size_t received, + time_t now, + struct osmo_fd **to_ofd, + struct osmo_sockaddr *to_addr) +{ + LOG("<- rx from GGSN %s\n", osmo_sockaddr_to_str(from_addr)); + + *to_ofd = &hub->to_sgsns[plane_idx].ofd; + + static struct gtp_packet_desc p; + gtp_decode(buf, received, plane_idx, &p); + + if (p.rc <= 0) + return -1; + + int rc; + rc = gtphub_handle_echo(&p); + if (rc == 1) { + /* It was en echo. Nothing left to do. */ + /* (*to_ofd already set above.) */ + osmo_sockaddr_copy(to_addr, from_addr); + return 0; + } + if (rc < 0) + return -1; /* Invalid packet. */ + + /* If a GGSN 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 *ggsn = hub->ggsn_proxy[plane_idx]; + if (ggsn) { + if (osmo_sockaddr_cmp(&ggsn->sa, from_addr) != 0) { + LOGERR("Rejecting: GGSN proxy configured, but GTP packet" + " received on GGSN bind is from another sender:" + " proxy: %s sender: %s\n", + gtphub_port_str(ggsn), + osmo_sockaddr_to_str(from_addr)); + return -1; + } + } + + if (!ggsn) { + ggsn = gtphub_port_find_sa(&hub->to_ggsns[plane_idx], from_addr); + } + + /* If any PDP context has been created, we already have an entry for + * this GGSN. If we don't have an entry, the GGSN has nothing to tell + * us about. */ + if (!ggsn) { + LOGERR("Invalid GGSN peer. Dropping packet.\n"); + return -1; + } + + LOG("GGSN peer: %s\n", gtphub_port_str(ggsn)); + + struct gtphub_peer_port *sgsn_from_seq; + struct gtphub_peer_port *sgsn; + if (gtphub_unmap(hub, &p, ggsn, + hub->sgsn_proxy[plane_idx], + &sgsn, &sgsn_from_seq, + NULL /* not interested, got it in &sgsn already */ + ) + != 0) { + return -1; + } + + if (!sgsn) { + /* A GGSN initiated request would go to a known TEI. So this is + * bogus. */ + LOGERR("No SGSN to send to. Dropping packet.\n"); + 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_ies(hub, hub->to_ggsns, + hub->to_sgsns, &p, now) + != 0) + return -1; + } + + gtphub_check_restart_counter(hub, &p, ggsn); + gtphub_map_restart_counter(hub, &p, ggsn, sgsn); + + /* If the GGSN is replying to an SGSN request, the sequence nr has + * already been unmapped above (sgsn_from_seq != NULL), and we need not + * create a new mapping. */ + if (!sgsn_from_seq) + gtphub_map_seq(&p, ggsn, sgsn, now); + + osmo_sockaddr_copy(to_addr, &sgsn->sa); + return received; +} + +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("\n\n=== 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; + size_t len; + + len = gtphub_read(from_sgsns_ofd, &from_addr, buf, sizeof(buf)); + if (len < 1) + return 0; + + len = gtphub_from_sgsns_handle_buf(hub, plane_idx, &from_addr, buf, len, + gtphub_now(), + &to_ofd, &to_addr); + if (len < 1) + return 0; + + return gtphub_write(to_ofd, &to_addr, buf, len); +} + +/* Analogous to gtphub_from_ggsns_handle_buf(), see the comment there. */ +int gtphub_from_sgsns_handle_buf(struct gtphub *hub, + unsigned int plane_idx, + const struct osmo_sockaddr *from_addr, + uint8_t *buf, + size_t received, + time_t now, + struct osmo_fd **to_ofd, + struct osmo_sockaddr *to_addr) +{ + LOG("-> rx from SGSN %s\n", osmo_sockaddr_to_str(from_addr)); + + *to_ofd = &hub->to_ggsns[plane_idx].ofd; + + static struct gtp_packet_desc p; + gtp_decode(buf, received, plane_idx, &p); + + if (p.rc <= 0) + return -1; + + int rc; + rc = gtphub_handle_echo(&p); + if (rc == 1) { + /* It was en echo. Nothing left to do. */ + /* (*to_ofd already set above.) */ + osmo_sockaddr_copy(to_addr, from_addr); + return 0; + } + if (rc < 0) + return -1; /* Invalid packet. */ + + /* If an SGSN 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 *sgsn = hub->sgsn_proxy[plane_idx]; + if (sgsn) { + if (osmo_sockaddr_cmp(&sgsn->sa, from_addr) != 0) { + LOGERR("Rejecting: GGSN proxy configured, but GTP packet" + " received on GGSN bind is from another sender:" + " proxy: %s sender: %s\n", + gtphub_port_str(sgsn), + osmo_sockaddr_to_str(from_addr)); + return -1; + } + } + + if (!sgsn) { + /* If any contact has been made before, we already have an + * entry for this SGSN. */ + sgsn = gtphub_port_find_sa(&hub->to_sgsns[plane_idx], from_addr); + } + + if (!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) { + LOGERR("User plane peer was not announced by PDP Context, discarding: %s\n", + 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; + + sgsn = gtphub_port_have(hub, &hub->to_sgsns[plane_idx], + &from_gsna, from_port); + } + + if (!sgsn) { + /* This could theoretically happen for invalid address data or somesuch. */ + LOGERR("Invalid SGSN peer. Dropping packet.\n"); + return -1; + } + LOG("SGSN peer: %s\n", gtphub_port_str(sgsn)); + + struct gtphub_peer_port *ggsn_from_seq; + struct gtphub_peer_port *ggsn; + if (gtphub_unmap(hub, &p, sgsn, + hub->ggsn_proxy[plane_idx], + &ggsn, &ggsn_from_seq, + NULL /* not interested, got it in &ggsn already */ + ) + != 0) { + return -1; + } + + /* See what our GGSN guess would be from the packet data per se. */ + /* TODO maybe not do this always? */ + struct gtphub_peer_port *ggsn_from_packet; + ggsn_from_packet = gtphub_resolve_ggsn(hub, &p); + + if (ggsn_from_packet && ggsn + && (ggsn_from_packet != ggsn)) { + LOGERR("GGSN implied from packet does not match unmapped" + " GGSN, using unmapped GGSN:" + " from packet: %s unmapped: %s\n", + gtphub_port_str(ggsn_from_packet), + gtphub_port_str2(ggsn)); + /* TODO return -1; ? */ + } + + if (!ggsn) + ggsn = ggsn_from_packet; + + if (!ggsn) { + LOGERR("No GGSN to send to. Dropping packet.\n"); + return -1; + } + + if (plane_idx == GTPH_PLANE_CTRL) { + /* This may be a Create PDP Context requst. If it is, there are other + * addresses in the GTP message to set up apart from the sender. */ + if (gtphub_handle_pdp_ctx_ies(hub, hub->to_sgsns, + hub->to_ggsns, &p, now) + != 0) + return -1; + } + + gtphub_check_restart_counter(hub, &p, sgsn); + gtphub_map_restart_counter(hub, &p, sgsn, ggsn); + + /* If the SGSN is replying to a GGSN request, the sequence nr has + * already been unmapped above (unmap_ggsn != NULL), and we need not + * create a new outgoing sequence map. */ + if (!ggsn_from_seq) + gtphub_map_seq(&p, sgsn, ggsn, now); + + osmo_sockaddr_copy(to_addr, &ggsn->sa); + + return received; +} + +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("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. */ + + LOG("gc peer %p llist_empty %d seq_map_empty %d\n", p, + (int)llist_empty(&p->addresses), (int) nr_map_empty(&p->seq_map)); + if (! nr_map_empty(&p->seq_map)) { + printf("not empty\n"); + struct nr_mapping *nrm; + llist_for_each_entry(nrm, &p->seq_map.mappings, entry) { + printf("%p %s %d -> %d\n", + nrm->origin, gtphub_port_str(nrm->origin),nrm->orig, nrm->repl); + } + } + 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_seq_maps, now); + expired += expiry_tick(&hub->expire_tei_maps, now); + + /* ... */ + + if (expired) { + int i; + for (i = 0; i < GTPH_PLANE_N; i++) { + gtphub_gc_bind(&hub->to_sgsns[i]); + gtphub_gc_bind(&hub->to_ggsns[i]); + } + } +} + +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) +{ + hub->gc_timer.cb = gtphub_gc_cb; + hub->gc_timer.data = 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); + + expiry_init(&hub->expire_seq_maps, GTPH_SEQ_MAPPING_EXPIRY_SECS); + expiry_init(&hub->expire_tei_maps, GTPH_TEI_MAPPING_EXPIRY_MINUTES * 60); + + int plane_idx; + for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) { + nr_pool_init(&hub->tei_pool[plane_idx]); + nr_map_init(&hub->tei_map[plane_idx], + &hub->tei_pool[plane_idx], + &hub->expire_tei_maps); + + gtphub_bind_init(&hub->to_ggsns[plane_idx]); + gtphub_bind_init(&hub->to_sgsns[plane_idx]); + } +} + +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) +{ + int rc; + + gtphub_init(hub); + + int plane_idx; + for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) { + rc = gtphub_bind_start(&hub->to_ggsns[plane_idx], + &cfg->to_ggsns[plane_idx], + from_ggsns_read_cb, hub, plane_idx); + if (rc) { + LOGERR("Failed to bind for GGSNs (%s)\n", + gtphub_plane_idx_names[plane_idx]); + return rc; + } + + rc = gtphub_bind_start(&hub->to_sgsns[plane_idx], + &cfg->to_sgsns[plane_idx], + from_sgsns_read_cb, hub, plane_idx); + if (rc) { + LOGERR("Failed to bind for SGSNs (%s)\n", + gtphub_plane_idx_names[plane_idx]); + return rc; + } + } + + + for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) { + if (gtphub_make_proxy(hub, + &hub->sgsn_proxy[plane_idx], + &hub->to_sgsns[plane_idx], + &cfg->sgsn_proxy[plane_idx]) + != 0) { + LOGERR("Cannot configure SGSN proxy %s port %d.\n", + cfg->sgsn_proxy[plane_idx].addr_str, + (int)cfg->sgsn_proxy[plane_idx].port); + return -1; + } + if (gtphub_make_proxy(hub, + &hub->ggsn_proxy[plane_idx], + &hub->to_ggsns[plane_idx], + &cfg->ggsn_proxy[plane_idx]) + != 0) { + LOGERR("Cannot configure GGSN proxy.\n"); + return -1; + } + } + + for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) { + if (hub->sgsn_proxy[plane_idx]) + LOG("Using SGSN %s proxy %s\n", + gtphub_plane_idx_names[plane_idx], + gtphub_port_str(hub->sgsn_proxy[plane_idx])); + } + + for (plane_idx = 0; plane_idx < GTPH_PLANE_N; plane_idx++) { + if (hub->sgsn_proxy[plane_idx]) + LOG("Using GGSN %s proxy %s\n", + gtphub_plane_idx_names[plane_idx], + gtphub_port_str(hub->ggsn_proxy[plane_idx])); + } + + 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; + gsn_addr_from_sockaddr(&gsna, &port, addr); + 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); + nr_map_init(&peer->seq_map, &peer->seq_pool, &hub->expire_seq_maps); + + /* 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); + return gtphub_peer_add_addr(peer, addr); +} + +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; + + if (gsn_addr_to_sockaddr(&a->addr, port, &pp->sa) != 0) { + talloc_free(pp); + return NULL; + } + + llist_add(&pp->entry, &a->ports); + + LOG("New peer: %s port %d\n", + gsn_addr_to_str(&a->addr), + (int)port); + + return pp; +} + +static 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); +} + +/* port_override: <=0: use port from addr; >0: use this number as port. Return + * NULL if the address cannot be parsed. */ +static struct gtphub_peer_port *gtphub_port_have_sockaddr(struct gtphub *hub, + struct gtphub_bind *bind, + const struct osmo_sockaddr *addr, + int port_override) +{ + struct gsn_addr gsna; + uint16_t port; + if (gsn_addr_from_sockaddr(&gsna, &port, addr) != 0) + return NULL; + + if (port_override > 0) + port = port_override; + return gtphub_port_have(hub, bind, &gsna, port); +} + +static struct gtphub_peer_port *gtphub_have_ggsn(struct gtphub *hub, + struct osmo_sockaddr *addr, + unsigned int plane_idx, + int port_override) +{ + if (port_override == 0) + port_override = gtphub_plane_idx_default_port[plane_idx]; + + return gtphub_port_have_sockaddr(hub, &hub->to_ggsns[plane_idx], addr, + port_override); +} + +static struct gtphub_peer_port *gtphub_resolve_ggsn(struct gtphub *hub, + struct gtp_packet_desc *p) +{ + int rc; + + struct osmo_sockaddr addr; + + rc = gtphub_resolve_ggsn_addr(hub, &addr, p); + if (rc < 0) + return NULL; + + return gtphub_have_ggsn(hub, &addr, p->plane_idx, -1); +} + + +/* TODO move to osmocom/core/socket.c ? */ +/* The caller is required to call freeaddrinfo(*result), iff zero is returned. */ +/* use this in osmo_sock_init() to remove dup. */ +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) { + LOGERR("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/openbsc/src/gprs/gtphub_ext.c b/openbsc/src/gprs/gtphub_ext.c new file mode 100644 index 000000000..0a4164c73 --- /dev/null +++ b/openbsc/src/gprs/gtphub_ext.c @@ -0,0 +1,58 @@ +/* GTP Hub Implementation */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> + * All Rights Reserved + * + * gtphub_ext.c -- ext means extern. 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 <http://www.gnu.org/licenses/>. + */ + +#include <string.h> + +#include <openbsc/gtphub.h> +#include <osmocom/core/utils.h> + +#define __llist_first(head) (((head)->next == (head)) ? NULL : (head)->next) +#define llist_first(head, type, entry) llist_entry(__llist_first(head), type, entry) + +int gtphub_resolve_ggsn_addr(struct gtphub *hub, + struct osmo_sockaddr *result, + struct gtp_packet_desc *p) +{ + /* TODO This is just hardcodedly returning the first known address. + * Should resolve from actual subscriber data. */ + struct gtphub_peer *peer = llist_first(&hub->to_ggsns[GTPH_PLANE_CTRL].peers, + struct gtphub_peer, entry); + if (!peer) + return -1; + + struct gtphub_peer_addr *pa = llist_first(&peer->addresses, + struct gtphub_peer_addr, entry); + if (!pa) + return -1; + + struct gtphub_peer_port *pp = llist_first(&pa->ports, + struct gtphub_peer_port, entry); + if (!pp) + return -1; + + *result = pp->sa; + return 0; +} + diff --git a/openbsc/src/gprs/gtphub_main.c b/openbsc/src/gprs/gtphub_main.c new file mode 100644 index 000000000..e0df0d6d3 --- /dev/null +++ b/openbsc/src/gprs/gtphub_main.c @@ -0,0 +1,282 @@ +/* GTP Hub main program */ + +/* (C) 2015 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> + * 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 <http://www.gnu.org/licenses/>. + */ + +#include <unistd.h> +#include <signal.h> +#include <string.h> +#include <errno.h> + +#define _GNU_SOURCE +#include <getopt.h> + +#include <osmocom/core/signal.h> +#include <osmocom/core/application.h> +#include <osmocom/core/logging.h> +#include <osmocom/core/utils.h> +#include <osmocom/core/rate_ctr.h> + +#include <osmocom/vty/logging.h> +#include <osmocom/vty/telnet_interface.h> + +#include <openbsc/debug.h> +#include <openbsc/gtphub.h> +#include <openbsc/vty.h> + +#include "../../bscconfig.h" + +#define LOGERR(fmt, args...) \ + LOGP(DGTPHUB, LOGL_ERROR, fmt, ##args) + +#define LOG(fmt, args...) \ + LOGP(DGTPHUB, LOGL_NOTICE, fmt, ##args) + +#ifndef OSMO_VTY_PORT_GTPHUB +/* should come from libosmocore */ +#define OSMO_VTY_PORT_GTPHUB 4253 +#endif + +extern void *osmo_gtphub_ctx; + + +const char *gtphub_copyright = + "Copyright (C) 2015 sysmocom s.f.m.c GmbH <info@sysmocom.de>\r\n" + "License AGPLv3+: GNU AGPL version 2 or later <http://gnu.org/licenses/agpl-3.0.html>\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_NOTICE, + }, +}; + +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) +{ + struct gtphub_cfg_addr *a; + a = &cfg->to_sgsns[GTPH_PLANE_CTRL].bind; + LOG("to-SGSNs bind, Control: %s port %d\n", + a->addr_str, a->port); + a = &cfg->to_sgsns[GTPH_PLANE_USER].bind; + LOG("to-SGSNs bind, User: %s port %d\n", + a->addr_str, a->port); + a = &cfg->to_ggsns[GTPH_PLANE_CTRL].bind; + LOG("to-GGSNs bind, Control: %s port %d\n", + a->addr_str, a->port); + a = &cfg->to_ggsns[GTPH_PLANE_USER].bind; + LOG("to-GGSNs bind, User: %s port %d\n", + a->addr_str, a->port); +} + +static void signal_handler(int signal) +{ + fprintf(stdout, "signal %u received\n", signal); + + switch (signal) { + case SIGINT: + 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; + } +} + +extern int bsc_vty_go_parent(struct vty *vty); + +static struct vty_app_info vty_info = { + .name = "OsmoGTPhub", + .version = PACKAGE_VERSION, + .go_parent_cb = bsc_vty_go_parent, + .is_config_node = bsc_vty_is_config_node, +}; + +struct cmdline_cfg { + const char *config_file; + int daemonize; +}; + +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 <cat> Enable Debugging for this category.\n"); + printf(" Pass '-d list' to get a category listing.\n"); + printf(" -s --disable-color"); + printf(" -c --config-file The config file to use [%s].\n", ccfg->config_file); + printf(" -e,--log-level <nr> Set a global log level.\n"); +} + +static void list_categories(void) +{ + printf("Avaliable 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'}, + {NULL, 0, 0, 0} + }; + + c = getopt_long(argc, argv, "hd:Dc:sTe:", + long_options, &option_index); + if (c == -1) + 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; + default: + /* ignore */ + break; + } + } +} + +int main(int argc, char **argv) +{ + int rc; + + osmo_gtphub_ctx = talloc_named_const(NULL, 0, "osmo_gtphub"); + + signal(SIGINT, &signal_handler); + signal(SIGABRT, &signal_handler); + signal(SIGUSR1, &signal_handler); + signal(SIGUSR2, &signal_handler); + osmo_init_ignore_signals(); + + osmo_init_logging(>phub_log_info); + + vty_info.copyright = gtphub_copyright; + vty_init(&vty_info); + logging_vty_add_cmds(>phub_log_info); + gtphub_vty_init(); + + rate_ctr_init(osmo_gtphub_ctx); + rc = telnet_init(osmo_gtphub_ctx, 0, OSMO_VTY_PORT_GTPHUB); + if (rc < 0) + exit(1); + + struct cmdline_cfg _ccfg; + struct cmdline_cfg *ccfg = &_ccfg; + memset(ccfg, '\0', sizeof(*ccfg)); + ccfg->config_file = "./gtphub.conf"; + + struct gtphub_cfg _cfg; + struct gtphub_cfg *cfg = &_cfg; + memset(cfg, '\0', sizeof(*cfg)); + + struct gtphub _hub; + struct gtphub *hub = &_hub; + + 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); + } + + if (gtphub_start(hub, cfg) != 0) + return -1; + + log_cfg(cfg); + + if (ccfg->daemonize) { + rc = osmo_daemonize(); + if (rc < 0) { + LOGERR("Error during daemonize"); + exit(1); + } + } + + while (1) { + rc = osmo_select_main(0); + if (rc < 0) + exit(3); + } + + /* not reached */ + exit(0); +} diff --git a/openbsc/src/gprs/gtphub_vty.c b/openbsc/src/gprs/gtphub_vty.c new file mode 100644 index 000000000..aead17878 --- /dev/null +++ b/openbsc/src/gprs/gtphub_vty.c @@ -0,0 +1,258 @@ +/* (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 <http://www.gnu.org/licenses/>. + * + */ + +#include <string.h> + +#include <osmocom/core/talloc.h> +#include <osmocom/vty/command.h> + +#include <openbsc/vty.h> +#include <openbsc/gtphub.h> + +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); +} + +static int config_write_gtphub(struct vty *vty) +{ + vty_out(vty, "gtphub%s", VTY_NEWLINE); + + write_addrs(vty, "bind-to-sgsns", + &g_cfg->to_sgsns[GTPH_PLANE_CTRL].bind, + &g_cfg->to_sgsns[GTPH_PLANE_USER].bind); + + write_addrs(vty, "bind-to-ggsns", + &g_cfg->to_ggsns[GTPH_PLANE_CTRL].bind, + &g_cfg->to_ggsns[GTPH_PLANE_USER].bind); + + if (g_cfg->ggsn_proxy[GTPH_PLANE_CTRL].addr_str) { + write_addrs(vty, "ggsn-proxy", + &g_cfg->ggsn_proxy[GTPH_PLANE_CTRL], + &g_cfg->ggsn_proxy[GTPH_PLANE_USER]); + } + + return CMD_SUCCESS; +} + +DEFUN(cfg_gtphub, cfg_gtphub_cmd, + "gtphub", + "Configure the GTP hub") +{ + 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 (i = 0; i < GTPH_PLANE_N; i++) + g_cfg->to_sgsns[i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->to_sgsns[GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->to_sgsns[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 (i = 0; i < GTPH_PLANE_N; i++) + g_cfg->to_ggsns[i].bind.addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->to_ggsns[GTPH_PLANE_CTRL].bind.port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->to_ggsns[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_sgsns, 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_ggsns, 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->ggsn_proxy[GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->ggsn_proxy[GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->ggsn_proxy[GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->ggsn_proxy[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->ggsn_proxy[GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->ggsn_proxy[GTPH_PLANE_CTRL].port = atoi(argv[1]); + g_cfg->ggsn_proxy[GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); + g_cfg->ggsn_proxy[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->sgsn_proxy[GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->sgsn_proxy[GTPH_PLANE_CTRL].port = GTPH_DEFAULT_CONTROL_PORT; + g_cfg->sgsn_proxy[GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->sgsn_proxy[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->sgsn_proxy[GTPH_PLANE_CTRL].addr_str = talloc_strdup(tall_vty_ctx, argv[0]); + g_cfg->sgsn_proxy[GTPH_PLANE_CTRL].port = atoi(argv[1]); + g_cfg->sgsn_proxy[GTPH_PLANE_USER].addr_str = talloc_strdup(tall_vty_ctx, argv[2]); + g_cfg->sgsn_proxy[GTPH_PLANE_USER].port = atoi(argv[3]); + return CMD_SUCCESS; +} + +DEFUN(show_gtphub, show_gtphub_cmd, "show gtphub", + SHOW_STR "Display information about the GTP hub") +{ + vty_out(vty, "gtphub has nothing to say yet%s", VTY_NEWLINE); + return CMD_SUCCESS; +} + + +int gtphub_vty_init(void) +{ + install_element_ve(&show_gtphub_cmd); + + install_element(CONFIG_NODE, &cfg_gtphub_cmd); + install_node(>phub_node, config_write_gtphub); + vty_install_default(GTPHUB_NODE); + + 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); + + return 0; +} + +int gtphub_cfg_read(struct gtphub_cfg *cfg, const char *config_file) +{ + int rc; + + g_cfg = cfg; + + 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; +} |