From 5f9d63fe1e7ec4250cf3fdf9af7d523f0063fcb7 Mon Sep 17 00:00:00 2001 From: Harald Welte Date: Sun, 12 Jul 2020 23:39:22 +0200 Subject: HACK; e1d-fr-test Change-Id: I31486c77609398093cc535eeafb20be9e95d8b03 --- configure.ac | 1 + contrib/e1-prbs-test/main.c | 3 + src/Makefile.am | 9 + src/e1d-fr-test.c | 214 +++++++++++++++++++ src/frame_relay.c | 511 ++++++++++++++++++++++++++++++++++++++++++++ src/frame_relay.h | 73 +++++++ 6 files changed, 811 insertions(+) create mode 100644 src/e1d-fr-test.c create mode 100644 src/frame_relay.c create mode 100644 src/frame_relay.h diff --git a/configure.ac b/configure.ac index 7a1a2da..c3976f9 100644 --- a/configure.ac +++ b/configure.ac @@ -34,6 +34,7 @@ PKG_CHECK_MODULES(TALLOC, [talloc >= 2.0.1]) PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.0.1.120) PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty) +PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm) PKG_CHECK_MODULES(LIBOSMOUSB, libosmousb) PKG_CHECK_MODULES(LIBUSB, libusb-1.0 >= 1.0.21) diff --git a/contrib/e1-prbs-test/main.c b/contrib/e1-prbs-test/main.c index c65fcc6..fda5163 100644 --- a/contrib/e1-prbs-test/main.c +++ b/contrib/e1-prbs-test/main.c @@ -36,6 +36,7 @@ #include #include +#include #include #include #include @@ -239,6 +240,8 @@ int main(int argc, char **argv) char *basedir; int rc; + osmo_init_logging2(NULL, NULL); + handle_options(argc, argv); if (argc <= optind) { diff --git a/src/Makefile.am b/src/Makefile.am index 6dd13ce..808c25d 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -22,12 +22,14 @@ libosmo_e1d_la_LIBADD = $(LIBOSMOCORE_LIBS) noinst_HEADERS = \ e1d.h \ log.h \ + frame_relay.h \ $(NULL) bin_PROGRAMS = \ osmo-e1d \ osmo-e1d-pipe \ + e1d-fr-test \ $(NULL) osmo_e1d_SOURCES = \ @@ -48,3 +50,10 @@ osmo_e1d_pipe_SOURCES = \ $(NULL) osmo_e1d_pipe_LDADD = $(LIBOSMOCORE_LIBS) libosmo-e1d.la + +e1d_fr_test_SOURCES = \ + e1d-fr-test.c \ + frame_relay.c \ + $(NULL) + +e1d_fr_test_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOGSM_LIBS) libosmo-e1d.la diff --git a/src/e1d-fr-test.c b/src/e1d-fr-test.c new file mode 100644 index 0000000..6df7634 --- /dev/null +++ b/src/e1d-fr-test.c @@ -0,0 +1,214 @@ +/* osmo-e1d client program implementing Frame Relay / ITU-T Q.933 Annex A LMI + * This can be used to verify the new "superchannel" support in osmo-e1d for + * transporting (among other things) frame relay. + * + * (C) 2020 by Harald Welte + * + * All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include + +#include + +#include "frame_relay.h" + + +static void *g_ctx; +static struct osmo_e1dp_client *g_client; +static struct osmo_fd ts_ofd; +struct fr_link *g_link; + + +static int ts_open(uint8_t intf_nr, uint8_t line_nr, uint8_t ts_nr, + enum osmo_e1dp_ts_mode mode) +{ + int rc = osmo_e1dp_client_ts_open(g_client, intf_nr, line_nr, ts_nr, mode, 1600); + if (rc < 0) + fprintf(stderr, "Cannot open e1d timeslot %u:%u:%u\n", intf_nr, line_nr, ts_nr); + return rc; +} + +int fr_tx(struct msgb *msg) +{ + int rc; + + OSMO_ASSERT(g_link == msg->dst); + + printf("Tx: %s\n", msgb_hexdump(msg)); + rc = write(ts_ofd.fd, msgb_data(msg), msgb_length(msg)); + if (rc != msgb_length(msg)) + exit(23); + + msgb_free(msg); + + return rc; +} + +static int dlc_rx_cb(struct fr_dlc *dlc, struct msgb *msg) +{ + printf("Rx DLCI %u: %s\n", dlc->dlci, msgb_hexdump(msg)); + msgb_free(msg); + return 0; +} + +static int ts_fd_cb(struct osmo_fd *ofd, unsigned int what) +{ + int rc; + + if (what & OSMO_FD_READ) { + struct msgb *rx = msgb_alloc(1600, "E1 Rx"); + rc = read(ofd->fd, msgb_data(rx), msgb_tailroom(rx)); + if (rc < 0 && errno != EAGAIN) + exit(3); + else if (rc == 0) + exit(4); + else if (rc > 0) { + msgb_put(rx, rc); + printf("Rx: %s\n", msgb_hexdump(rx)); + fr_rx(g_link, rx); + } + } + +#if 0 + if (what & OSMO_FD_WRITE) { + rc = read(infd, buf, sizeof(buf)); + if (rc < 0 && errno != EAGAIN) + exit(4); + else if (rc == 0) { /* EOF */ + rc = lseek(infd, 0, SEEK_SET); + if (rc < 0) { + perror("rewind input file"); + exit(5); + } + } else if (rc > 0) { + count = rc; + rc = write(ofd->fd, buf, count); + if (rc < 0 && errno != EAGAIN) + exit(4); + } + + } +#endif + + return 0; +} + +static void print_help(void) +{ + printf( + " -h --help This help message\n" + " -p --path PATH Path of the osmo-e1d control socket\n" + " -i --interface <0-255> E1 Interface Number\n" + " -l --line <0-255> E1 Line Number\n" + " -t --timeslot <0-31> E1 Timeslot Number\n" + " -m --mode (RAW|HDLC-FCS) E1 Timeslot Mode\n" + " -r --read FILE Read from FILE instead of STDIN\n" + ); +} + +int main(int argc, char **argv) +{ + int intf_nr = -1, line_nr = -1, ts_nr = -1; + char *path = E1DP_DEFAULT_SOCKET; + int tsfd; + int option_index; + + g_ctx = talloc_named_const(NULL, 0, "g_ctx"); + OSMO_ASSERT(g_ctx); + + osmo_init_logging2(g_ctx, NULL); + + /* FIXME: handle options */ + while (1) { + int c; + static const struct option long_options[] = { + { "help", 0, 0, 'h' }, + { "path", 1, 0, 'p' }, + { "interface", 1, 0, 'i' }, + { "line", 1, 0, 'l' }, + { "timeslot", 1, 0, 't' }, + { 0,0,0,0 } + }; + + c = getopt_long(argc, argv, "hp:i:l:t:m:r:", long_options, &option_index); + if (c == -1) + break; + + switch (c) { + case 'h': + print_help(); + exit(0); + case 'p': + path = optarg; + break; + case 'i': + intf_nr = atoi(optarg); + break; + case 'l': + line_nr = atoi(optarg); + break; + case 't': + ts_nr = atoi(optarg); + break; + } + } + + if (intf_nr == -1 || line_nr == -1 || ts_nr == -1) { + fprintf(stderr, "You must at least specify interface, line and timeslot numbers\n"); + exit(2); + } + + g_client = osmo_e1dp_client_create(g_ctx, path); + if (!g_client) { + fprintf(stderr, "Cannot establish connection to osmo-e1d at %s\n", path); + exit(1); + } + + tsfd = ts_open(intf_nr, line_nr, ts_nr, E1DP_TSMODE_HDLCFCS); + if (tsfd < 0) + exit(2); + + int rc = osmo_e1dp_client_line_config(g_client, intf_nr, line_nr, E1DP_LMODE_SUPERCHANNEL); + if (rc != 0) + exit(3); + + osmo_fd_setup(&ts_ofd, tsfd, OSMO_FD_READ/*|OSMO_FD_WRITE*/, ts_fd_cb, NULL, 0); + osmo_fd_register(&ts_ofd); + + struct fr_network *net = fr_network_alloc(NULL); + g_link = fr_link_alloc(net); + struct fr_dlc *dlc = fr_dlc_alloc(g_link, 23); + dlc->rx_cb = dlc_rx_cb; + + while (1) { + osmo_select_main(0); + } +} + diff --git a/src/frame_relay.c b/src/frame_relay.c new file mode 100644 index 0000000..3990a1a --- /dev/null +++ b/src/frame_relay.c @@ -0,0 +1,511 @@ +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +#include + +#include "frame_relay.h" + +#define DFR DLGLOBAL + +/* Table 4-2/Q.931 */ +enum q931_msgtype { + /* Call establishment message */ + Q931_MSGT_ALERTING = 0x01, + Q931_MSGT_CALL_PROCEEDING = 0x02, + Q931_MSGT_CONNECT = 0x07, + Q931_MSGT_CONNECT_ACK = 0x0f, + Q931_MSGT_PROGRESS = 0x03, + Q931_MSGT_SETUP = 0x05, + Q931_MSGT_SETUP_ACK = 0x0d, + /* Call information phase message */ + Q931_MSGT_RESUME = 0x26, + Q931_MSGT_RESUME_ACK = 0x2e, + Q931_MSGT_RESUME_REJ = 0x22, + Q931_MSGT_SUSPEND = 0x25, + Q931_MSGT_SUSPEND_ACK = 0x2d, + Q931_MSGT_USER_INFO = 0x20, + /* Call clearing message */ + Q931_MSGT_DISCONNECT = 0x45, + Q931_MSGT_RELEASE = 0x4d, + Q931_MSGT_RELEASE_COMPLETE = 0x5a, + Q931_MSGT_RESTART = 0x46, + Q931_MSGT_RESTART_ACK = 0x4e, + /* Miscellaneous messages */ + Q931_MSGT_SEGMENT = 0x60, + Q931_MSGT_CONGESTION_CONTROL = 0x79, + Q931_MSGT_IFORMATION = 0x7b, + Q931_MSGT_NOTIFY = 0x6e, + Q931_MSGT_STATUS = 0x7d, + Q931_MSGT_STATUS_ENQUIRY = 0x75, +}; + + +/* Figure A.1/Q.933 Report type information element */ +enum q933_type_of_report { + Q933_REPT_FULL_STATUS = 0x00, + Q933_REPT_LINK_INTEGRITY_VERIF = 0x01, + Q933_REPT_SINGLE_PVC_ASYNC_STS = 0x02, +}; + +/* Q.933 Section A.3 */ +enum q933_iei { + Q933_IEI_REPORT_TYPE = 0x51, + Q933_IEI_LINK_INT_VERIF = 0x53, + Q933_IEI_PVC_STATUS = 0x57, +}; + +#define LAPF_UI 0x03 /* UI control word */ +#define Q931_PDISC_CC 0x08 /* protocol discriminator */ +#define LMI_Q933A_CALLREF 0x00 /* NULL call-ref */ + +/* LMI DLCI values */ +#define LMI_Q933A_DLCI 0 /* Q.933A DLCI */ +#define LMI_CISCO_DLCI 1023 /* Cisco DLCI */ + + +/* Message header of the L3 payload of a Q.933 Annex A message */ +struct q933_a_hdr { + uint8_t prot_disc; + uint8_t call_ref; + uint8_t msg_type; +} __attribute__((packed)); + +/* Value part of the Q.933 Annex A.3.3 IE */ +struct q933_a_pvc_sts { + uint8_t ext0:1, + spare:1, + dlci_msb:6; + uint8_t ext1:1, + dlci_lsb:4, + spare1:3; + uint8_t ext2:1, + spare2:3, + new:1, + delete:1, + active:1, + reserved:1; +} __attribute__((packed)); + +// RX Message: 14 [ 00 01 03 08 00 75 95 01 01 00 03 02 01 00 ] +// RX Message: 13 [ 00 01 03 08 00 75 51 01 00 53 02 01 00 ] + +/* Table A.4/Q.933 */ +struct osmo_tdef fr_tdefs[] = { + { + .T=391, + .default_val = 10, + .min_val = 5, + .max_val = 30, + .desc = "Link integrity verification polling timer" + }, { + .T=392, + .default_val = 15, + .min_val = 5, + .max_val = 30, + .desc = "Polling verification timer" + }, + {} +}; + +static const struct tlv_definition q933_att_tlvdef = { + .def = { + [Q933_IEI_REPORT_TYPE] = { TLV_TYPE_TLV }, + [Q933_IEI_LINK_INT_VERIF] = { TLV_TYPE_TLV }, + [Q933_IEI_PVC_STATUS] = { TLV_TYPE_TLV }, + }, +}; + +static inline uint16_t q922_to_dlci(const uint8_t *hdr) +{ + return ((hdr[0] & 0xFC) << 2) | ((hdr[1] & 0xF0) >> 4); +} + + +static inline void dlci_to_q922(uint8_t *hdr, uint16_t dlci) +{ + hdr[0] = (dlci >> 2) & 0xFC; + hdr[1] = ((dlci << 4) & 0xF0) | 0x01; +} + +/* allocate a message buffer and put Q.933 Annex A headers (L2 + L3) */ +static struct msgb *q933_msgb_alloc(uint16_t dlci, uint8_t prot_disc, uint8_t msg_type) +{ + struct msgb *msg = msgb_alloc_headroom(1600+64, 64, "FR Q.933 Tx"); + struct q933_a_hdr *qh; + + if (!msg) + return NULL; + + msg->l1h = msgb_put(msg, 2); + dlci_to_q922(msg->l1h, dlci); + + /* LAPF UI control */ + msg->l2h = msgb_put(msg, 1); + *msg->l2h = LAPF_UI; + + msg->l3h = msgb_put(msg, sizeof(*qh)); + qh = (struct q933_a_hdr *) msg->l3h; + qh->prot_disc = prot_disc; + qh->call_ref = LMI_Q933A_CALLREF; + qh->msg_type = msg_type; + + return msg; +} + +/* obtain the [next] transmit sequence number */ +static uint8_t fr_link_get_tx_seq(struct fr_link *link) +{ + /* The {user equipment, network} increments the send sequence + * counter using modulo 256. The value zero is skipped. */ + link->last_tx_seq++; + if (link->last_tx_seq == 0) + link->last_tx_seq++; + + return link->last_tx_seq; +} + +/* Append PVC Status IE according to Q.933 A.3.2 */ +static void msgb_put_link_int_verif(struct msgb *msg, struct fr_link *link) +{ + uint8_t link_int_tx[2]; + link_int_tx[0] = fr_link_get_tx_seq(link); + link_int_tx[1] = link->last_rx_seq; + msgb_tlv_put(msg, Q933_IEI_LINK_INT_VERIF, 2, link_int_tx); +} + +static void dlc_destroy(struct fr_dlc *dlc) +{ + llist_del(&dlc->list); + talloc_free(dlc); +} + +/* Append PVC Status IE according to Q.933 A.3.3 */ +static void msgb_put_pvc_status(struct msgb *msg, struct fr_dlc *dlc) +{ + uint8_t ie[3]; + + ie[0] = (dlc->dlci >> 4) & 0x3f; + ie[1] = 0x80 | ((dlc->dlci & 0xf) << 3); + ie[2] = 0x80; + + if (dlc->active) + ie[2] |= 0x02; + + if (dlc->new) { + ie[2] |= 0x08; + /* we've reported it as new once, reset the status */ + dlc->new = false; + } + + if (dlc->del) { + ie[2] |= 0x04; + /* we've reported it as deleted once, destroy it */ + dlc_destroy(dlc); + } + + msgb_tlv_put(msg, Q933_IEI_PVC_STATUS, 3, ie); +} + +/* Send a Q.933 STATUS ENQUIRY given type over given link */ +static int tx_lmi_q933_status_enq(struct fr_link *link, uint8_t rep_type) +{ + struct msgb *resp; + + resp = q933_msgb_alloc(0, Q931_PDISC_CC, Q931_MSGT_STATUS_ENQUIRY); + if (!resp) + return -1; + resp->dst = link; + + /* Table A.2/Q.933 */ + msgb_tlv_put(resp, Q933_IEI_REPORT_TYPE, 1, &rep_type); + msgb_put_link_int_verif(resp, link); + + return fr_tx(resp); +} + +/* Send a Q.933 STATUS of given type over given link */ +static int tx_lmi_q933_status(struct fr_link *link, uint8_t rep_type) +{ + struct fr_dlc *dlc, *dlc2; + struct msgb *resp; + + resp = q933_msgb_alloc(0, Q931_PDISC_CC, Q931_MSGT_STATUS); + if (!resp) + return -1; + resp->dst = link; + + /* Table A.1/Q.933 */ + msgb_tlv_put(resp, Q933_IEI_REPORT_TYPE, 1, &rep_type); + switch (rep_type) { + case Q933_REPT_FULL_STATUS: + msgb_put_link_int_verif(resp, link); + llist_for_each_entry_safe(dlc, dlc2, &link->dlc_list, list) + msgb_put_pvc_status(resp, dlc); + break; + case Q933_REPT_LINK_INTEGRITY_VERIF: + msgb_put_link_int_verif(resp, link); + break; + case Q933_REPT_SINGLE_PVC_ASYNC_STS: + llist_for_each_entry_safe(dlc, dlc2, &link->dlc_list, list) + msgb_put_pvc_status(resp, dlc); + break; + } + + return fr_tx(resp); +} + + +/* Q.933 */ +static int rx_lmi_q933_status_enq(struct msgb *msg, struct tlv_parsed *tp) +{ + struct fr_link *link = msg->dst; + const uint8_t *link_int_rx; + uint8_t rep_type; + + /* check for mandatory IEs */ + if (!TLVP_PRES_LEN(tp, Q933_IEI_REPORT_TYPE, 1) || + !TLVP_PRES_LEN(tp, Q933_IEI_LINK_INT_VERIF, 2)) + return -1; + + rep_type = *TLVP_VAL(tp, Q933_IEI_REPORT_TYPE); + + link_int_rx = TLVP_VAL(tp, Q933_IEI_LINK_INT_VERIF); + link->last_rx_seq = link_int_rx[0]; + + /* the network checks the receive sequence number received from + * the user equipment against its send sequence counter */ + if (link_int_rx[1] != link->last_tx_seq) + link->err_count++; + + /* The network responds to each STATUS ENQUIRY message with a + * STATUS message and resets the T392 timer */ + osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0); + + return tx_lmi_q933_status(link, rep_type); +} + +static int rx_lmi_q933_status(struct msgb *msg, struct tlv_parsed *tp) +{ + struct fr_link *link = msg->dst; + const uint8_t *link_int_rx; + uint8_t rep_type; + + /* check for mandatory IEs */ + if (!TLVP_PRES_LEN(tp, Q933_IEI_REPORT_TYPE, 1)) + return -1; + rep_type = *TLVP_VAL(tp, Q933_IEI_REPORT_TYPE); + + switch (rep_type) { + case Q933_REPT_FULL_STATUS: + case Q933_REPT_LINK_INTEGRITY_VERIF: + if (!TLVP_PRES_LEN(tp, Q933_IEI_LINK_INT_VERIF, 2)) + return -1; + link_int_rx = TLVP_VAL(tp, Q933_IEI_LINK_INT_VERIF); + link->last_rx_seq = link_int_rx[0]; + /* The received receive sequence number is not valid if + * it is not equal to the last transmitted send sequence + * number. Ignore messages containing this error. As a + * result, timer T391 expires and the user then + * increments the error count. */ + if (link_int_rx[1] != link->last_tx_seq) + return 0; + break; + case Q933_REPT_SINGLE_PVC_ASYNC_STS: + break; + default: + return -1; + } + + /* FIXME: process any PVC Status IEs */ + + /* The network responds to each STATUS ENQUIRY message with a + * STATUS message and resets the T392 timer */ + osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0); + + return tx_lmi_q933_status(link, rep_type); +} + + +static int fr_rx_lmi_q922(struct msgb *msg) +{ + struct q933_a_hdr *qh; + struct tlv_parsed tp; + uint8_t *lapf; + int rc; + + if (msgb_l2len(msg) < 1) + return -1; + lapf = msgb_l2(msg); + + /* we only support LAPF UI frames */ + if (lapf[0] != LAPF_UI) + return -1; + + msg->l3h = msg->l2h + 1; + if (msgb_l3len(msg) < 3) + return -1; + + qh = (struct q933_a_hdr *) msgb_l3(msg); + if (qh->prot_disc != Q931_PDISC_CC) { + LOGP(DFR, LOGL_NOTICE, "Rx unsupported LMI protocol discriminator %u\n", qh->prot_disc); + return -1; + } + + tlv_parse(&tp, &q933_att_tlvdef, msgb_l3(msg) + sizeof(*qh), msgb_l3len(msg) - sizeof(*qh), 0, 0); + + switch (qh->msg_type) { + case Q931_MSGT_STATUS_ENQUIRY: + rc = rx_lmi_q933_status_enq(msg, &tp); + break; + case Q931_MSGT_STATUS: + rc = rx_lmi_q933_status(msg, &tp); + break; + default: + LOGP(DFR, LOGL_NOTICE, "Rx unsupported LMI message type %u\n", qh->msg_type); + rc = -1; + break; + } + msgb_free(msg); + + return rc; +} + +int fr_rx(struct fr_link *link, struct msgb *msg) +{ + uint8_t *frh; + uint16_t dlci; + struct fr_dlc *dlc; + + msg->dst = link; + + if (msgb_length(msg) < 2) { + LOGP(DFR, LOGL_ERROR, "Short FR header: %u bytes\n", msgb_length(msg)); + msgb_free(msg); + return -1; + } + + frh = msg->l1h = msgb_data(msg); + if (frh[0] & 0x01) { + LOGP(DFR, LOGL_NOTICE, "Unsupported single-byte FR address\n"); + msgb_free(msg); + return 1; + } + if ((frh[1] & 0x0f) != 0x01) { + LOGP(DFR, LOGL_NOTICE, "Unknown second FR octet 0x%02x\n", frh[1]); + msgb_free(msg); + return -1; + } + dlci = q922_to_dlci(frh); + msg->l2h = frh + 2; + + switch (dlci) { + case LMI_Q933A_DLCI: + return fr_rx_lmi_q922(msg); + case LMI_CISCO_DLCI: + LOGP(DFR, LOGL_NOTICE, "Unsupported FR DLCI %u\n", dlci); + msgb_free(msg); + return 0; + } + + llist_for_each_entry(dlc, &link->dlc_list, list) { + if (dlc->dlci == dlci) { + /* dispatch to handler of respective DLC */ + return dlc->rx_cb(dlc, msg); + } + } + + if (link->unknown_dlc_rx_cb) + return link->unknown_dlc_rx_cb(NULL, msg); + else + LOGP(DFR, LOGL_NOTICE, "DLCI %u doesn't exist, discarding\n", dlci); + + return 0; +} + + + + + +/* Every T391 seconds, the user equipment sends a STATUS ENQUIRY + * message to the network and resets its polling timer (T391). */ +static void fr_t391_cb(void *data) +{ + struct fr_link *link = data; + + if (link->polling_count % link->net->n391 == 0) + tx_lmi_q933_status_enq(link, Q933_REPT_FULL_STATUS); + else + tx_lmi_q933_status_enq(link, Q933_REPT_LINK_INTEGRITY_VERIF); + link->polling_count++; + osmo_timer_schedule(&link->t391, osmo_tdef_get(link->net->T_defs, 391, OSMO_TDEF_S, 10), 0); +} + +static void fr_t392_cb(void *data) +{ + struct fr_link *link = data; + /* A.5 The network increments the error count .. Non-receipt of + * a STATUS ENQUIRY within T392, which results in restarting + * T392 */ + link->err_count++; + osmo_timer_schedule(&link->t392, osmo_tdef_get(link->net->T_defs, 392, OSMO_TDEF_S, 15), 0); +} + +/* allocate a frame relay network */ +struct fr_network *fr_network_alloc(void *ctx) +{ + struct fr_network *net = talloc_zero(ctx, struct fr_network); + + INIT_LLIST_HEAD(&net->links); + net->T_defs = fr_tdefs; + net->n391 = 6; + net->n392 = 3; + net->n393 = 4; + + return net; +} + +/* allocate a frame relay link in a given network */ +struct fr_link *fr_link_alloc(struct fr_network *net) +{ + struct fr_link *link = talloc_zero(net, struct fr_link); + if (!link) + return NULL; + + link->net = net; + INIT_LLIST_HEAD(&link->dlc_list); + osmo_timer_setup(&link->t391, fr_t391_cb, link); + osmo_timer_setup(&link->t392, fr_t392_cb, link); + + /* TODO: schedule any timers */ + + llist_add_tail(&link->list, &net->links); + + return link; +} + +/* allocate a data link connectoin on a given framerelay link */ +struct fr_dlc *fr_dlc_alloc(struct fr_link *link, uint16_t dlci) +{ + struct fr_dlc *dlc = talloc_zero(link, struct fr_dlc); + if (!dlc) + return NULL; + + dlc->link = link; + dlc->dlci = dlci; + dlc->active = true; // FIXME: HACK + + llist_add_tail(&dlc->list, &link->dlc_list); + + dlc->new = true; + tx_lmi_q933_status(link, Q933_IEI_PVC_STATUS); + + return dlc; +} diff --git a/src/frame_relay.h b/src/frame_relay.h new file mode 100644 index 0000000..6061208 --- /dev/null +++ b/src/frame_relay.h @@ -0,0 +1,73 @@ +#pragma once + +#include +#include +#include + +struct fr_network { + struct llist_head links; + + unsigned int n391; /* full status polling counter */ + unsigned int n392; /* error threshold */ + unsigned int n393; /* monitored events count */ + struct osmo_tdef *T_defs; /* T391, T392 */ +}; + +struct fr_dlc; + +/* Frame Relay Link */ +struct fr_link { + /* list in fr_network.links */ + struct llist_head list; + struct fr_network *net; + + /* value of the last received send sequence number field in the + * link integrity verification information element */ + uint8_t last_rx_seq; + + /* value of the send sequence number field of the last link + * integrity verification information element sent */ + uint8_t last_tx_seq; + + struct osmo_timer_list t391; + struct osmo_timer_list t392; + unsigned int polling_count; + unsigned int err_count; + + /* list of data link connections at this link */ + struct llist_head dlc_list; + + int (*unknown_dlc_rx_cb)(struct fr_dlc *dlc, struct msgb *msg); +}; + +/* Frame Relay Data Link Connection */ +struct fr_dlc { + /* entry in fr_link.dlc_list */ + struct llist_head list; + struct fr_link *link; + + uint16_t dlci; + + /* is this DLC marked active for traffic? */ + bool active; + /* was this DLC newly added? */ + bool new; + /* is this DLC about to be destroyed */ + bool del; + + int (*rx_cb)(struct fr_dlc *dlc, struct msgb *msg); +}; + + +/* allocate a frame relay network */ +struct fr_network *fr_network_alloc(void *ctx); + +/* allocate a frame relay link in a given network */ +struct fr_link *fr_link_alloc(struct fr_network *net); + +/* allocate a data link connectoin on a given framerelay link */ +struct fr_dlc *fr_dlc_alloc(struct fr_link *link, uint16_t dlci); + +int fr_rx(struct fr_link *link, struct msgb *msg); + +extern int fr_tx(struct msgb *msg); -- cgit v1.2.3