| /* NS-over-IP proxy */ |
| |
| /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
| * (C) 2010-2013 by On-Waves |
| * (C) 2013 by Holger Hans Peter Freyther |
| * All Rights Reserved |
| * |
| * 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 <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <getopt.h> |
| #include <errno.h> |
| #include <sys/fcntl.h> |
| #include <sys/stat.h> |
| #include <arpa/inet.h> |
| #include <time.h> |
| |
| #include <osmocom/core/logging.h> |
| #include <osmocom/core/talloc.h> |
| #include <osmocom/core/select.h> |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/stats.h> |
| |
| #include <osmocom/gprs/gprs_ns2.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| #include <osmocom/gprs/gprs_bssgp_bss.h> |
| |
| #include <osmocom/gsm/gsm_utils.h> |
| |
| #include <osmocom/sgsn/signal.h> |
| #include <osmocom/sgsn/debug.h> |
| #include <osmocom/sgsn/gprs_gb_parse.h> |
| #include <osmocom/sgsn/gb_proxy.h> |
| |
| #include <osmocom/sgsn/gprs_llc.h> |
| #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
| #include <osmocom/sgsn/gprs_utils.h> |
| |
| extern void *tall_sgsn_ctx; |
| |
| static const struct rate_ctr_desc global_ctr_description[] = { |
| { "inv-bvci", "Invalid BVC Identifier " }, |
| { "inv-lai", "Invalid Location Area Identifier" }, |
| { "inv-rai", "Invalid Routing Area Identifier " }, |
| { "inv-nsei", "No BVC established for NSEI " }, |
| { "proto-err:bss", "BSSGP protocol error (BSS )" }, |
| { "proto-err:sgsn", "BSSGP protocol error (SGSN)" }, |
| { "not-supp:bss", "Feature not supported (BSS )" }, |
| { "not-supp:sgsn", "Feature not supported (SGSN)" }, |
| { "restart:sgsn", "Restarted RESET procedure (SGSN)" }, |
| { "tx-err:sgsn", "NS Transmission error (SGSN)" }, |
| { "error", "Other error " }, |
| { "mod-peer-err", "Patch error: no peer " }, |
| }; |
| |
| static const struct rate_ctr_group_desc global_ctrg_desc = { |
| .group_name_prefix = "gbproxy:global", |
| .group_description = "GBProxy Global Statistics", |
| .num_ctr = ARRAY_SIZE(global_ctr_description), |
| .ctr_desc = global_ctr_description, |
| .class_id = OSMO_STATS_CLASS_GLOBAL, |
| }; |
| |
| static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer, |
| uint16_t ns_bvci); |
| static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
| uint16_t ns_bvci, uint16_t sgsn_nsei); |
| static void gbproxy_reset_imsi_acquisition(struct gbproxy_link_info* link_info); |
| |
| static int check_peer_nsei(struct gbproxy_peer *peer, uint16_t nsei) |
| { |
| OSMO_ASSERT(peer); |
| OSMO_ASSERT(peer->nse); |
| |
| if (peer->nse->nsei != nsei) { |
| LOGPBVC(peer, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
| "via NSE(%05u/BSS)\n", nsei); |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* strip off the NS header */ |
| static void strip_ns_hdr(struct msgb *msg) |
| { |
| int strip_len = msgb_bssgph(msg) - msg->data; |
| msgb_pull(msg, strip_len); |
| } |
| |
| /* Transmit Chapter 9.2.10 Identity Request */ |
| static void gprs_put_identity_req(struct msgb *msg, uint8_t id_type) |
| { |
| struct gsm48_hdr *gh; |
| |
| id_type &= GSM_MI_TYPE_MASK; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| gh->msg_type = GSM48_MT_GMM_ID_REQ; |
| gh->data[0] = id_type; |
| } |
| |
| /* Transmit Chapter 9.4.6.2 Detach Accept (mobile originated detach) */ |
| static void gprs_put_mo_detach_acc(struct msgb *msg) |
| { |
| struct gsm48_hdr *gh; |
| |
| gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| gh->msg_type = GSM48_MT_GMM_DETACH_ACK; |
| gh->data[0] = 0; /* no force to standby */ |
| } |
| |
| static void gprs_push_llc_ui(struct msgb *msg, |
| int is_uplink, unsigned sapi, unsigned nu) |
| { |
| const uint8_t e_bit = 0; |
| const uint8_t pm_bit = 1; |
| const uint8_t cr_bit = is_uplink ? 0 : 1; |
| uint8_t *llc; |
| uint8_t *fcs_field; |
| uint32_t fcs; |
| |
| nu &= 0x01ff; /* 9 Bit */ |
| |
| llc = msgb_push(msg, 3); |
| llc[0] = (cr_bit << 6) | (sapi & 0x0f); |
| llc[1] = 0xc0 | (nu >> 6); /* UI frame */ |
| llc[2] = (nu << 2) | ((e_bit & 1) << 1) | (pm_bit & 1); |
| |
| fcs = gprs_llc_fcs(llc, msgb_length(msg)); |
| fcs_field = msgb_put(msg, 3); |
| fcs_field[0] = (uint8_t)(fcs >> 0); |
| fcs_field[1] = (uint8_t)(fcs >> 8); |
| fcs_field[2] = (uint8_t)(fcs >> 16); |
| } |
| |
| static void gprs_push_bssgp_dl_unitdata(struct msgb *msg, |
| uint32_t tlli) |
| { |
| struct bssgp_ud_hdr *budh; |
| uint8_t *llc = msgb_data(msg); |
| size_t llc_size = msgb_length(msg); |
| const size_t llc_ie_hdr_size = 3; |
| const uint8_t qos_profile[] = {0x00, 0x50, 0x20}; /* hard-coded */ |
| const uint8_t lifetime[] = {0x02, 0x58}; /* 6s hard-coded */ |
| |
| const size_t bssgp_overhead = sizeof(*budh) + |
| TVLV_GROSS_LEN(sizeof(lifetime)) + llc_ie_hdr_size; |
| uint8_t *ie; |
| uint32_t tlli_be = htonl(tlli); |
| |
| budh = (struct bssgp_ud_hdr *)msgb_push(msg, bssgp_overhead); |
| |
| budh->pdu_type = BSSGP_PDUT_DL_UNITDATA; |
| memcpy(&budh->tlli, &tlli_be, sizeof(budh->tlli)); |
| memcpy(&budh->qos_profile, qos_profile, sizeof(budh->qos_profile)); |
| |
| ie = budh->data; |
| tvlv_put(ie, BSSGP_IE_PDU_LIFETIME, sizeof(lifetime), lifetime); |
| ie += TVLV_GROSS_LEN(sizeof(lifetime)); |
| |
| /* Note: Add alignment before the LLC IE if inserting other IE */ |
| |
| *(ie++) = BSSGP_IE_LLC_PDU; |
| *(ie++) = llc_size / 256; |
| *(ie++) = llc_size % 256; |
| |
| OSMO_ASSERT(ie == llc); |
| |
| msgb_bssgph(msg) = (uint8_t *)budh; |
| msgb_tlli(msg) = tlli; |
| } |
| |
| /* update peer according to the BSS message */ |
| static void gbprox_update_current_raid(uint8_t *raid_enc, |
| struct gbproxy_peer *peer, |
| const char *log_text) |
| { |
| struct gbproxy_patch_state *state = &peer->patch_state; |
| const struct osmo_plmn_id old_plmn = state->local_plmn; |
| struct gprs_ra_id raid; |
| OSMO_ASSERT(peer->nse); |
| struct gbproxy_config *cfg = peer->nse->cfg; |
| OSMO_ASSERT(cfg); |
| |
| if (!raid_enc) |
| return; |
| |
| gsm48_parse_ra(&raid, raid_enc); |
| |
| /* save source side MCC/MNC */ |
| if (!cfg->core_plmn.mcc || raid.mcc == cfg->core_plmn.mcc) { |
| state->local_plmn.mcc = 0; |
| } else { |
| state->local_plmn.mcc = raid.mcc; |
| } |
| |
| if (!cfg->core_plmn.mnc |
| || !osmo_mnc_cmp(raid.mnc, raid.mnc_3_digits, |
| cfg->core_plmn.mnc, cfg->core_plmn.mnc_3_digits)) { |
| state->local_plmn.mnc = 0; |
| state->local_plmn.mnc_3_digits = false; |
| } else { |
| state->local_plmn.mnc = raid.mnc; |
| state->local_plmn.mnc_3_digits = raid.mnc_3_digits; |
| } |
| |
| if (osmo_plmn_cmp(&old_plmn, &state->local_plmn)) |
| LOGPBVC(peer, LOGL_NOTICE, |
| "Patching RAID %sactivated, msg: %s, " |
| "local: %s, core: %s\n", |
| state->local_plmn.mcc || state->local_plmn.mnc ? |
| "" : "de", |
| log_text, |
| osmo_plmn_name(&state->local_plmn), |
| osmo_plmn_name2(&cfg->core_plmn)); |
| } |
| |
| uint32_t gbproxy_make_bss_ptmsi(struct gbproxy_peer *peer, |
| uint32_t sgsn_ptmsi) |
| { |
| uint32_t bss_ptmsi; |
| int max_retries = 23, rc = 0; |
| if (!peer->nse->cfg->patch_ptmsi) { |
| bss_ptmsi = sgsn_ptmsi; |
| } else { |
| do { |
| rc = osmo_get_rand_id((uint8_t *) &bss_ptmsi, sizeof(bss_ptmsi)); |
| if (rc < 0) { |
| bss_ptmsi = GSM_RESERVED_TMSI; |
| break; |
| } |
| |
| bss_ptmsi = bss_ptmsi | GSM23003_TMSI_SGSN_MASK; |
| |
| if (gbproxy_link_info_by_ptmsi(peer, bss_ptmsi)) |
| bss_ptmsi = GSM_RESERVED_TMSI; |
| } while (bss_ptmsi == GSM_RESERVED_TMSI && max_retries--); |
| } |
| |
| if (bss_ptmsi == GSM_RESERVED_TMSI) |
| LOGPBVC(peer, LOGL_ERROR, "Failed to allocate a BSS P-TMSI: %d (%s)\n", rc, strerror(-rc)); |
| |
| return bss_ptmsi; |
| } |
| |
| uint32_t gbproxy_make_sgsn_tlli(struct gbproxy_peer *peer, |
| struct gbproxy_link_info *link_info, |
| uint32_t bss_tlli) |
| { |
| uint32_t sgsn_tlli; |
| int max_retries = 23, rc = 0; |
| if (!peer->nse->cfg->patch_ptmsi) { |
| sgsn_tlli = bss_tlli; |
| } else if (link_info->sgsn_tlli.ptmsi != GSM_RESERVED_TMSI && |
| gprs_tlli_type(bss_tlli) == TLLI_FOREIGN) { |
| sgsn_tlli = gprs_tmsi2tlli(link_info->sgsn_tlli.ptmsi, |
| TLLI_FOREIGN); |
| } else if (link_info->sgsn_tlli.ptmsi != GSM_RESERVED_TMSI && |
| gprs_tlli_type(bss_tlli) == TLLI_LOCAL) { |
| sgsn_tlli = gprs_tmsi2tlli(link_info->sgsn_tlli.ptmsi, |
| TLLI_LOCAL); |
| } else { |
| do { |
| /* create random TLLI, 0b01111xxx... */ |
| rc = osmo_get_rand_id((uint8_t *) &sgsn_tlli, sizeof(sgsn_tlli)); |
| if (rc < 0) { |
| sgsn_tlli = 0; |
| break; |
| } |
| |
| sgsn_tlli = (sgsn_tlli & 0x7fffffff) | 0x78000000; |
| |
| if (gbproxy_link_info_by_any_sgsn_tlli(peer, sgsn_tlli)) |
| sgsn_tlli = 0; |
| } while (!sgsn_tlli && max_retries--); |
| } |
| |
| if (!sgsn_tlli) |
| LOGPBVC(peer, LOGL_ERROR, "Failed to allocate an SGSN TLLI: %d (%s)\n", rc, strerror(-rc)); |
| |
| return sgsn_tlli; |
| } |
| |
| void gbproxy_reset_link(struct gbproxy_link_info *link_info) |
| { |
| gbproxy_reset_imsi_acquisition(link_info); |
| } |
| |
| /* Returns != 0 iff IMSI acquisition was in progress */ |
| static int gbproxy_restart_imsi_acquisition(struct gbproxy_link_info* link_info) |
| { |
| int in_progress = 0; |
| if (!link_info) |
| return 0; |
| |
| if (link_info->imsi_acq_pending) |
| in_progress = 1; |
| |
| gbproxy_link_info_discard_messages(link_info); |
| link_info->imsi_acq_pending = false; |
| |
| return in_progress; |
| } |
| |
| static void gbproxy_reset_imsi_acquisition(struct gbproxy_link_info* link_info) |
| { |
| gbproxy_restart_imsi_acquisition(link_info); |
| link_info->vu_gen_tx_bss = GBPROXY_INIT_VU_GEN_TX; |
| } |
| |
| /* Got identity response with IMSI, assuming the request had |
| * been generated by the gbproxy */ |
| static int gbproxy_flush_stored_messages(struct gbproxy_peer *peer, |
| time_t now, |
| struct gbproxy_link_info* link_info) |
| { |
| int rc; |
| struct msgb *stored_msg; |
| OSMO_ASSERT(peer); |
| OSMO_ASSERT(peer->nse); |
| struct gbproxy_config *cfg = peer->nse->cfg; |
| OSMO_ASSERT(cfg); |
| |
| /* Patch and flush stored messages towards the SGSN */ |
| while ((stored_msg = msgb_dequeue_count(&link_info->stored_msgs, |
| &link_info->stored_msgs_len))) { |
| struct gprs_gb_parse_context tmp_parse_ctx = {0}; |
| tmp_parse_ctx.to_bss = 0; |
| tmp_parse_ctx.peer_nsei = msgb_nsei(stored_msg); |
| int len_change = 0; |
| |
| gprs_gb_parse_bssgp(msgb_bssgph(stored_msg), |
| msgb_bssgp_len(stored_msg), |
| &tmp_parse_ctx); |
| gbproxy_patch_bssgp(stored_msg, msgb_bssgph(stored_msg), |
| msgb_bssgp_len(stored_msg), |
| peer, link_info, &len_change, |
| &tmp_parse_ctx); |
| |
| rc = gbproxy_update_link_state_after(peer, link_info, now, |
| &tmp_parse_ctx); |
| if (rc == 1) { |
| LOGPBVC_CAT(peer, DLLC, LOGL_NOTICE, "link_info deleted while flushing stored messages\n"); |
| msgb_free(stored_msg); |
| return -1; |
| } |
| |
| rc = gbprox_relay2sgsn(cfg, stored_msg, |
| msgb_bvci(stored_msg), link_info->sgsn_nsei); |
| |
| if (rc < 0) |
| LOGPBVC_CAT(peer, DLLC, LOGL_ERROR, |
| "failed to send stored message " |
| "(%s)\n", |
| tmp_parse_ctx.llc_msg_name ? |
| tmp_parse_ctx.llc_msg_name : "BSSGP"); |
| msgb_free(stored_msg); |
| } |
| |
| return 0; |
| } |
| |
| static int gbproxy_gsm48_to_peer(struct gbproxy_peer *peer, |
| struct gbproxy_link_info* link_info, |
| uint16_t bvci, |
| struct msgb *msg /* Takes msg ownership */) |
| { |
| int rc; |
| |
| /* Workaround to avoid N(U) collisions and to enable a restart |
| * of the IMSI acquisition procedure. This will work unless the |
| * SGSN has an initial V(UT) within [256-32, 256+n_retries] |
| * (see GSM 04.64, 8.4.2). */ |
| gprs_push_llc_ui(msg, 0, GPRS_SAPI_GMM, link_info->vu_gen_tx_bss); |
| link_info->vu_gen_tx_bss = (link_info->vu_gen_tx_bss + 1) % 512; |
| |
| gprs_push_bssgp_dl_unitdata(msg, link_info->tlli.current); |
| msg->l3h = msg->data; |
| |
| rc = gbprox_relay2peer(msg, peer, bvci); |
| msgb_free(msg); |
| return rc; |
| } |
| |
| static void gbproxy_acquire_imsi(struct gbproxy_peer *peer, |
| struct gbproxy_link_info* link_info, |
| uint16_t bvci) |
| { |
| struct msgb *idreq_msg; |
| |
| /* Send IDENT REQ */ |
| idreq_msg = gsm48_msgb_alloc_name("GSM 04.08 ACQ IMSI"); |
| gprs_put_identity_req(idreq_msg, GSM_MI_TYPE_IMSI); |
| gbproxy_gsm48_to_peer(peer, link_info, bvci, idreq_msg); |
| } |
| |
| static void gbproxy_tx_detach_acc(struct gbproxy_peer *peer, |
| struct gbproxy_link_info* link_info, |
| uint16_t bvci) |
| { |
| struct msgb *detacc_msg; |
| |
| /* Send DETACH ACC */ |
| detacc_msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACC"); |
| gprs_put_mo_detach_acc(detacc_msg); |
| gbproxy_gsm48_to_peer(peer, link_info, bvci, detacc_msg); |
| } |
| |
| /* Return != 0 iff msg still needs to be processed */ |
| static int gbproxy_imsi_acquisition(struct gbproxy_peer *peer, |
| struct msgb *msg, |
| time_t now, |
| struct gbproxy_link_info* link_info, |
| struct gprs_gb_parse_context *parse_ctx) |
| { |
| struct msgb *stored_msg; |
| OSMO_ASSERT(peer); |
| OSMO_ASSERT(peer->nse); |
| struct gbproxy_config *cfg = peer->nse->cfg; |
| OSMO_ASSERT(cfg); |
| |
| if (!link_info) |
| return 1; |
| |
| if (!link_info->imsi_acq_pending && link_info->imsi_len > 0) |
| return 1; |
| |
| if (parse_ctx->g48_hdr) |
| switch (parse_ctx->g48_hdr->msg_type) |
| { |
| case GSM48_MT_GMM_RA_UPD_REQ: |
| case GSM48_MT_GMM_ATTACH_REQ: |
| if (gbproxy_restart_imsi_acquisition(link_info)) { |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| " IMSI acquisition was in progress " |
| "when receiving an %s.\n", |
| parse_ctx->llc_msg_name); |
| } |
| break; |
| case GSM48_MT_GMM_DETACH_REQ: |
| /* Nothing has been sent to the SGSN yet */ |
| if (link_info->imsi_acq_pending) { |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| "IMSI acquisition was in progress " |
| "when receiving a DETACH_REQ.\n"); |
| } |
| if (!parse_ctx->invalidate_tlli) { |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| "IMSI not yet acquired, " |
| "faking a DETACH_ACC.\n"); |
| gbproxy_tx_detach_acc(peer, link_info, msgb_bvci(msg)); |
| parse_ctx->invalidate_tlli = 1; |
| } |
| gbproxy_reset_imsi_acquisition(link_info); |
| gbproxy_update_link_state_after(peer, link_info, now, |
| parse_ctx); |
| return 0; |
| } |
| |
| if (link_info->imsi_acq_pending && link_info->imsi_len > 0) { |
| int is_ident_resp = |
| parse_ctx->g48_hdr && |
| gsm48_hdr_pdisc(parse_ctx->g48_hdr) == GSM48_PDISC_MM_GPRS && |
| gsm48_hdr_msg_type(parse_ctx->g48_hdr) == GSM48_MT_GMM_ID_RESP; |
| |
| LOGPBVC_CAT(peer, DLLC, LOGL_DEBUG, |
| "IMSI acquisition succeeded, " |
| "flushing stored messages\n"); |
| /* The IMSI is now available. If flushing the messages fails, |
| * then link_info has been deleted and we should return |
| * immediately. */ |
| if (gbproxy_flush_stored_messages(peer, now, link_info) < 0) |
| return 0; |
| |
| gbproxy_reset_imsi_acquisition(link_info); |
| |
| /* This message is most probably the response to the ident |
| * request sent by gbproxy_acquire_imsi(). Don't forward it to |
| * the SGSN. */ |
| return !is_ident_resp; |
| } |
| |
| /* The message cannot be processed since the IMSI is still missing */ |
| |
| /* If queue is getting too large, drop oldest msgb before adding new one */ |
| if (cfg->stored_msgs_max_len > 0) { |
| int exceeded_max_len = link_info->stored_msgs_len |
| + 1 - cfg->stored_msgs_max_len; |
| |
| for (; exceeded_max_len > 0; exceeded_max_len--) { |
| struct msgb *msgb_drop; |
| msgb_drop = msgb_dequeue_count(&link_info->stored_msgs, |
| &link_info->stored_msgs_len); |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| "Dropping stored msgb from list " |
| "(!acq imsi, length %d, max_len exceeded)\n", |
| link_info->stored_msgs_len); |
| |
| msgb_free(msgb_drop); |
| } |
| } |
| |
| /* Enqueue unpatched messages */ |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| "IMSI acquisition in progress, " |
| "storing message (%s)\n", |
| parse_ctx->llc_msg_name ? parse_ctx->llc_msg_name : "BSSGP"); |
| |
| stored_msg = bssgp_msgb_copy(msg, "process_bssgp_ul"); |
| msgb_enqueue_count(&link_info->stored_msgs, stored_msg, |
| &link_info->stored_msgs_len); |
| |
| if (!link_info->imsi_acq_pending) { |
| LOGPBVC_CAT(peer, DLLC, LOGL_INFO, |
| "IMSI is required but not available, " |
| "initiating identification procedure (%s)\n", |
| parse_ctx->llc_msg_name ? parse_ctx->llc_msg_name : "BSSGP"); |
| |
| gbproxy_acquire_imsi(peer, link_info, msgb_bvci(msg)); |
| |
| /* There is no explicit retransmission handling, the |
| * implementation relies on the MS doing proper retransmissions |
| * of the triggering message instead */ |
| |
| link_info->imsi_acq_pending = true; |
| } |
| |
| return 0; |
| } |
| |
| struct gbproxy_peer *gbproxy_find_peer(struct gbproxy_config *cfg, |
| struct msgb *msg, |
| struct gprs_gb_parse_context *parse_ctx) |
| { |
| struct gbproxy_peer *peer = NULL; |
| |
| if (msgb_bvci(msg) >= 2) |
| peer = gbproxy_peer_by_bvci(cfg, msgb_bvci(msg)); |
| |
| if (!peer && !parse_ctx->to_bss) |
| peer = gbproxy_peer_by_nsei(cfg, msgb_nsei(msg)); |
| |
| if (!peer) |
| peer = gbproxy_peer_by_bssgp_tlv(cfg, &parse_ctx->bssgp_tp); |
| |
| if (!peer) { |
| LOGP(DLLC, LOGL_INFO, |
| "NSE(%05u/%s) patching: didn't find peer for message, " |
| "PDU %d\n", |
| msgb_nsei(msg), parse_ctx->to_bss ? "BSS" : "SGSN", |
| parse_ctx->pdu_type); |
| /* Increment counter */ |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
| } |
| return peer; |
| } |
| |
| /* patch BSSGP message */ |
| static int gbprox_process_bssgp_ul(struct gbproxy_config *cfg, |
| struct msgb *msg, |
| struct gbproxy_peer *peer) |
| { |
| struct gprs_gb_parse_context parse_ctx = {0}; |
| int rc; |
| int len_change = 0; |
| time_t now; |
| struct timespec ts = {0,}; |
| struct gbproxy_link_info *link_info = NULL; |
| uint32_t sgsn_nsei = cfg->nsip_sgsn_nsei; |
| |
| if (!cfg->core_plmn.mcc && !cfg->core_plmn.mnc && !cfg->core_apn && |
| !cfg->acquire_imsi && !cfg->patch_ptmsi && !cfg->route_to_sgsn2) |
| return 1; |
| |
| parse_ctx.to_bss = 0; |
| parse_ctx.peer_nsei = msgb_nsei(msg); |
| |
| /* Parse BSSGP/LLC */ |
| rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| &parse_ctx); |
| |
| if (!rc && !parse_ctx.need_decryption) { |
| LOGP(DGPRS, LOGL_ERROR, |
| "NSE(%05u/BSS) patching: failed to parse invalid %s message\n", |
| msgb_nsei(msg), gprs_gb_message_name(&parse_ctx, "NS_UNITDATA")); |
| gprs_gb_log_parse_context(LOGL_NOTICE, &parse_ctx, "NS_UNITDATA"); |
| LOGP(DGPRS, LOGL_NOTICE, |
| "NSE(%05u/BSS) invalid message was: %s\n", |
| msgb_nsei(msg), msgb_hexdump(msg)); |
| return 0; |
| } |
| |
| /* Get peer */ |
| if (!peer) |
| peer = gbproxy_find_peer(cfg, msg, &parse_ctx); |
| |
| if (!peer) |
| return 0; |
| |
| |
| osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
| now = ts.tv_sec; |
| |
| gbprox_update_current_raid(parse_ctx.bssgp_raid_enc, peer, |
| parse_ctx.llc_msg_name); |
| |
| gprs_gb_log_parse_context(LOGL_DEBUG, &parse_ctx, "NS_UNITDATA"); |
| |
| link_info = gbproxy_update_link_state_ul(peer, now, &parse_ctx); |
| |
| if (parse_ctx.g48_hdr) { |
| switch (parse_ctx.g48_hdr->msg_type) { |
| case GSM48_MT_GMM_ATTACH_REQ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
| break; |
| case GSM48_MT_GMM_DETACH_REQ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DETACH_REQS]); |
| break; |
| case GSM48_MT_GMM_ATTACH_COMPL: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_COMPLS]); |
| break; |
| case GSM48_MT_GMM_RA_UPD_REQ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_REQS]); |
| break; |
| case GSM48_MT_GMM_RA_UPD_COMPL: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_COMPLS]); |
| break; |
| case GSM48_MT_GMM_STATUS: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_GMM_STATUS_BSS]); |
| break; |
| case GSM48_MT_GSM_ACT_PDP_REQ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_REQS]); |
| break; |
| case GSM48_MT_GSM_DEACT_PDP_REQ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_PDP_DEACT_REQS]); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| if (link_info && cfg->route_to_sgsn2) { |
| if (cfg->acquire_imsi && link_info->imsi_len == 0) |
| sgsn_nsei = 0xffff; |
| else if (gbproxy_imsi_matches(cfg, GBPROX_MATCH_ROUTING, |
| link_info)) |
| sgsn_nsei = cfg->nsip_sgsn2_nsei; |
| } |
| |
| if (link_info) |
| link_info->sgsn_nsei = sgsn_nsei; |
| |
| /* Handle IMSI acquisition */ |
| if (cfg->acquire_imsi) { |
| rc = gbproxy_imsi_acquisition(peer, msg, now, link_info, |
| &parse_ctx); |
| if (rc <= 0) |
| return rc; |
| } |
| |
| gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
| peer, link_info, &len_change, &parse_ctx); |
| |
| gbproxy_update_link_state_after(peer, link_info, now, &parse_ctx); |
| |
| if (sgsn_nsei != cfg->nsip_sgsn_nsei) { |
| /* Send message directly to the selected SGSN */ |
| rc = gbprox_relay2sgsn(cfg, msg, msgb_bvci(msg), sgsn_nsei); |
| /* Don't let the calling code handle the transmission */ |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| /* patch BSSGP message to use core_plmn.mcc/mnc on the SGSN side */ |
| static void gbprox_process_bssgp_dl(struct gbproxy_config *cfg, |
| struct msgb *msg, |
| struct gbproxy_peer *peer) |
| { |
| struct gprs_gb_parse_context parse_ctx = {0}; |
| int rc; |
| int len_change = 0; |
| time_t now; |
| struct timespec ts = {0,}; |
| struct gbproxy_link_info *link_info = NULL; |
| |
| if (!cfg->core_plmn.mcc && !cfg->core_plmn.mnc && !cfg->core_apn && |
| !cfg->acquire_imsi && !cfg->patch_ptmsi && !cfg->route_to_sgsn2) |
| return; |
| |
| parse_ctx.to_bss = 1; |
| parse_ctx.peer_nsei = msgb_nsei(msg); |
| |
| rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| &parse_ctx); |
| |
| if (!rc && !parse_ctx.need_decryption) { |
| LOGP(DGPRS, LOGL_ERROR, |
| "NSE(%05u/SGSN) patching: failed to parse invalid %s message\n", |
| msgb_nsei(msg), gprs_gb_message_name(&parse_ctx, "NS_UNITDATA")); |
| gprs_gb_log_parse_context(LOGL_NOTICE, &parse_ctx, "NS_UNITDATA"); |
| LOGP(DGPRS, LOGL_NOTICE, |
| "NSE(%05u/SGSN) invalid message was: %s\n", |
| msgb_nsei(msg), msgb_hexdump(msg)); |
| return; |
| } |
| |
| /* Get peer */ |
| if (!peer) |
| peer = gbproxy_find_peer(cfg, msg, &parse_ctx); |
| |
| if (!peer) |
| return; |
| |
| osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
| now = ts.tv_sec; |
| |
| if (parse_ctx.g48_hdr) { |
| switch (parse_ctx.g48_hdr->msg_type) { |
| case GSM48_MT_GMM_ATTACH_ACK: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_ACKS]); |
| break; |
| case GSM48_MT_GMM_ATTACH_REJ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
| break; |
| case GSM48_MT_GMM_DETACH_ACK: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DETACH_ACKS]); |
| break; |
| case GSM48_MT_GMM_RA_UPD_ACK: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_ACKS]); |
| break; |
| case GSM48_MT_GMM_RA_UPD_REJ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_REJS]); |
| break; |
| case GSM48_MT_GMM_STATUS: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_GMM_STATUS_SGSN]); |
| break; |
| case GSM48_MT_GSM_ACT_PDP_ACK: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_ACKS]); |
| break; |
| case GSM48_MT_GSM_ACT_PDP_REJ: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_REJS]); |
| break; |
| case GSM48_MT_GSM_DEACT_PDP_ACK: |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_PDP_DEACT_ACKS]); |
| break; |
| |
| default: |
| break; |
| } |
| } |
| |
| gprs_gb_log_parse_context(LOGL_DEBUG, &parse_ctx, "NS_UNITDATA"); |
| |
| link_info = gbproxy_update_link_state_dl(peer, now, &parse_ctx); |
| |
| gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
| peer, link_info, &len_change, &parse_ctx); |
| |
| gbproxy_update_link_state_after(peer, link_info, now, &parse_ctx); |
| |
| return; |
| } |
| |
| /* feed a message down the NS-VC associated with the specified peer */ |
| static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
| uint16_t ns_bvci, uint16_t sgsn_nsei) |
| { |
| /* create a copy of the message so the old one can |
| * be free()d safely when we return from gbprox_rcvmsg() */ |
| struct gprs_ns2_inst *nsi = cfg->nsi; |
| struct osmo_gprs_ns2_prim nsp = {}; |
| struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2sgsn"); |
| int rc; |
| |
| DEBUGP(DGPRS, "NSE(%05u/BSS)-BVC(%05u) proxying BTS->SGSN NSE(%05u/SGSN)\n", |
| msgb_nsei(msg), ns_bvci, sgsn_nsei); |
| |
| nsp.bvci = ns_bvci; |
| nsp.nsei = sgsn_nsei; |
| |
| strip_ns_hdr(msg); |
| osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, |
| PRIM_OP_REQUEST, msg); |
| rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
| if (rc < 0) |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
| return rc; |
| } |
| |
| /* feed a message down the NSE */ |
| static int gbprox_relay2nse(struct msgb *old_msg, struct gbproxy_nse *nse, |
| uint16_t ns_bvci) |
| { |
| OSMO_ASSERT(nse); |
| OSMO_ASSERT(nse->cfg); |
| |
| /* create a copy of the message so the old one can |
| * be free()d safely when we return from gbprox_rcvmsg() */ |
| struct gprs_ns2_inst *nsi = nse->cfg->nsi; |
| struct osmo_gprs_ns2_prim nsp = {}; |
| struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2nse"); |
| uint32_t tlli; |
| int rc; |
| |
| DEBUGP(DGPRS, "NSE(%05u/SGSN)-BVC(%05u) proxying SGSN->BSS NSE(%05u/BSS)\n", |
| msgb_nsei(msg), ns_bvci, nse->nsei); |
| |
| nsp.bvci = ns_bvci; |
| nsp.nsei = nse->nsei; |
| |
| /* Strip the old NS header, it will be replaced with a new one */ |
| strip_ns_hdr(msg); |
| |
| /* TS 48.018 Section 5.4.2: The link selector parameter is |
| * defined in 3GPP TS 48.016. At one side of the Gb interface, |
| * all BSSGP UNITDATA PDUs related to an MS shall be passed with |
| * the same LSP, e.g. the LSP contains the MS's TLLI, to the |
| * underlying network service. */ |
| if (gprs_gb_parse_tlli(msgb_data(msg), msgb_length(msg), &tlli) == 1) |
| nsp.u.unitdata.link_selector = tlli; |
| |
| osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, |
| PRIM_OP_REQUEST, msg); |
| rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
| /* FIXME: We need a counter group for gbproxy_nse */ |
| //if (rc < 0) |
| // rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| |
| return rc; |
| } |
| |
| /* feed a message down the NS-VC associated with the specified peer */ |
| static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer, |
| uint16_t ns_bvci) |
| { |
| int rc; |
| struct gbproxy_nse *nse = peer->nse; |
| OSMO_ASSERT(nse); |
| |
| rc = gbprox_relay2nse(old_msg, nse, ns_bvci); |
| if (rc < 0) |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| |
| return rc; |
| } |
| |
| static int block_unblock_peer(struct gbproxy_config *cfg, uint16_t ptp_bvci, uint8_t pdu_type) |
| { |
| struct gbproxy_peer *peer; |
| |
| peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "BVC(%05u/??) Cannot find BSS\n", |
| ptp_bvci); |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| return -ENOENT; |
| } |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| peer->blocked = true; |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
| break; |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| peer->blocked = false; |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
| break; |
| default: |
| break; |
| } |
| return 0; |
| } |
| |
| /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| * in the NS hdr */ |
| static int gbprox_relay2bvci(struct gbproxy_config *cfg, struct msgb *msg, uint16_t ptp_bvci, |
| uint16_t ns_bvci) |
| { |
| struct gbproxy_peer *peer; |
| |
| peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "BVC(%05u/??) Cannot find BSS\n", |
| ptp_bvci); |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| return -ENOENT; |
| } |
| |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| { |
| return 0; |
| } |
| |
| /* Receive an incoming PTP message from a BSS-side NS-VC */ |
| static int gbprox_rx_ptp_from_bss(struct gbproxy_config *cfg, |
| struct msgb *msg, uint16_t nsei, |
| uint16_t ns_bvci) |
| { |
| struct gbproxy_peer *peer; |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| uint8_t pdu_type = bgph->pdu_type; |
| int rc; |
| |
| peer = gbproxy_peer_by_bvci(cfg, ns_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_NOTICE, "BVC(%05u/??) Didn't find peer " |
| "for PTP message from NSE(%05u/BSS), " |
| "discarding message\n", |
| ns_bvci, nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| &ns_bvci, msg); |
| } |
| |
| /* TODO: Should we discard this message if the check fails */ |
| check_peer_nsei(peer, nsei); |
| |
| rc = gbprox_process_bssgp_ul(cfg, msg, peer); |
| if (!rc) |
| return 0; |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_FLOW_CONTROL_BVC: |
| if (!cfg->route_to_sgsn2) |
| break; |
| |
| /* Send a copy to the secondary SGSN */ |
| gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn2_nsei); |
| break; |
| default: |
| break; |
| } |
| |
| |
| return gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn_nsei); |
| } |
| |
| /* Receive an incoming PTP message from a SGSN-side NS-VC */ |
| static int gbprox_rx_ptp_from_sgsn(struct gbproxy_config *cfg, |
| struct msgb *msg, uint16_t nsei, |
| uint16_t ns_bvci) |
| { |
| struct gbproxy_peer *peer; |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| uint8_t pdu_type = bgph->pdu_type; |
| |
| peer = gbproxy_peer_by_bvci(cfg, ns_bvci); |
| |
| /* Send status messages before patching */ |
| |
| if (!peer) { |
| LOGP(DGPRS, LOGL_INFO, "BVC(%05u/??) Didn't find peer for " |
| "for message from NSE(%05u/SGSN)\n", |
| ns_bvci, nsei); |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| &ns_bvci, msg); |
| } |
| |
| if (peer->blocked) { |
| LOGPBVC(peer, LOGL_NOTICE, "Dropping PDU for " |
| "blocked BVC via NSE(%05u/SGSN)\n", nsei); |
| rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
| return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &ns_bvci, msg); |
| } |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| if (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei) |
| /* Hide ACKs from the secondary SGSN, the primary SGSN |
| * is responsible to send them. */ |
| return 0; |
| break; |
| default: |
| break; |
| } |
| |
| /* Optionally patch the message */ |
| gbprox_process_bssgp_dl(cfg, msg, peer); |
| |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| /* process a BVC-RESET message from the BSS side */ |
| static int gbprox_rx_bvc_reset_from_bss(struct gbproxy_config *cfg, struct msgb *msg, |
| uint16_t nsei, struct tlv_parsed *tp, |
| int *copy_to_sgsn2) |
| { |
| struct gbproxy_peer *from_peer = NULL; |
| uint16_t bvci; |
| |
| if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) |
| return 0; |
| |
| bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| LOGP(DGPRS, LOGL_INFO, "NSE(%05u) Rx BVC RESET (BVCI=%05u)\n", nsei, bvci); |
| if (bvci == 0) { |
| /* If we receive a BVC reset on the signalling endpoint, we |
| * don't want the SGSN to reset, as the signalling endpoint |
| * is common for all point-to-point BVCs (and thus all BTS) */ |
| |
| /* Ensure the NSE peer is there and clear all PtP BVCs */ |
| struct gbproxy_nse *nse = gbproxy_nse_by_nsei_or_new(cfg, nsei); |
| if (!nse) { |
| LOGP(DGPRS, LOGL_ERROR, "Could not create NSE(%05u)\n", nsei); |
| bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, 0, msg); |
| return 0; |
| } |
| |
| gbproxy_cleanup_peers(cfg, nsei, 0); |
| |
| /* FIXME: only do this if SGSN is alive! */ |
| LOGPNSE(nse, LOGL_INFO, "Tx fake BVC RESET ACK of BVCI=0\n"); |
| bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, nsei, 0, 0); |
| return 0; |
| } else { |
| from_peer = gbproxy_peer_by_bvci(cfg, bvci); |
| if (!from_peer) { |
| struct gbproxy_nse *nse = gbproxy_nse_by_nsei(cfg, nsei); |
| if (!nse) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) Got PtP BVC reset before signalling reset for " |
| "BVCI=%05u\n", nsei, bvci); |
| bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_STATE, NULL, msg); |
| return 0; |
| } |
| /* if a PTP-BVC is reset, and we don't know that |
| * PTP-BVCI yet, we should allocate a new peer */ |
| from_peer = gbproxy_peer_alloc(nse, bvci); |
| OSMO_ASSERT(from_peer); |
| LOGPBVC(from_peer, LOGL_INFO, "Allocated new peer\n"); |
| } |
| |
| /* Could have moved to a different NSE */ |
| if (!check_peer_nsei(from_peer, nsei)) { |
| LOGPBVC(from_peer, LOGL_NOTICE, "moving peer to NSE(%05u)\n", nsei); |
| |
| struct gbproxy_nse *nse_new = gbproxy_nse_by_nsei(cfg, nsei); |
| if (!nse_new) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) Got PtP BVC reset before signalling reset for " |
| "BVCI=%05u\n", bvci, nsei); |
| bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_STATE, NULL, msg); |
| return 0; |
| } |
| |
| /* Move peer to different NSE */ |
| gbproxy_peer_move(from_peer, nse_new); |
| } |
| |
| if (TLVP_PRESENT(tp, BSSGP_IE_CELL_ID)) { |
| struct gprs_ra_id raid; |
| /* We have a Cell Identifier present in this |
| * PDU, this means we can extend our local |
| * state information about this particular cell |
| * */ |
| memcpy(from_peer->ra, TLVP_VAL(tp, BSSGP_IE_CELL_ID), sizeof(from_peer->ra)); |
| gsm48_parse_ra(&raid, from_peer->ra); |
| LOGPBVC(from_peer, LOGL_INFO, "Cell ID %s\n", osmo_rai_name(&raid)); |
| } |
| if (cfg->route_to_sgsn2) |
| *copy_to_sgsn2 = 1; |
| } |
| /* continue processing / relaying to SGSN[s] */ |
| return 1; |
| } |
| |
| /* Receive an incoming signalling message from a BSS-side NS-VC */ |
| static int gbprox_rx_sig_from_bss(struct gbproxy_config *cfg, |
| struct msgb *msg, uint16_t nsei, |
| uint16_t ns_bvci) |
| { |
| struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| struct tlv_parsed tp; |
| uint8_t pdu_type = bgph->pdu_type; |
| int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
| struct gbproxy_peer *from_peer = NULL; |
| struct gprs_ra_id raid; |
| int copy_to_sgsn2 = 0; |
| int rc; |
| |
| if (ns_bvci != 0 && ns_bvci != 1) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) BVCI=%05u is not signalling\n", |
| nsei, ns_bvci); |
| return -EINVAL; |
| } |
| |
| /* we actually should never see those two for BVCI == 0, but double-check |
| * just to make sure */ |
| if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) UNITDATA not allowed in " |
| "signalling\n", nsei); |
| return -EINVAL; |
| } |
| |
| bssgp_tlv_parse(&tp, bgph->data, data_len); |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_SUSPEND: |
| case BSSGP_PDUT_RESUME: |
| /* We implement RAI snooping during SUSPEND/RESUME, since it |
| * establishes a relationsip between BVCI/peer and the routeing |
| * area identification. The snooped information is then used |
| * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| * BSSGP */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| goto err_mand_ie; |
| from_peer = gbproxy_peer_by_nsei(cfg, nsei); |
| if (!from_peer) |
| goto err_no_peer; |
| memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| sizeof(from_peer->ra)); |
| gsm48_parse_ra(&raid, from_peer->ra); |
| LOGPBVC(from_peer, LOGL_INFO, "BSSGP SUSPEND/RESUME " |
| "RAI snooping: RAI %s\n", |
| osmo_rai_name(&raid)); |
| /* FIXME: This only supports one BSS per RA */ |
| break; |
| case BSSGP_PDUT_BVC_RESET: |
| rc = gbprox_rx_bvc_reset_from_bss(cfg, msg, nsei, &tp, ©_to_sgsn2); |
| /* if function retruns 0, we terminate processing here */ |
| if (rc == 0) |
| return 0; |
| break; |
| } |
| |
| /* Normally, we can simply pass on all signalling messages from BSS to |
| * SGSN */ |
| rc = gbprox_process_bssgp_ul(cfg, msg, from_peer); |
| if (!rc) |
| return 0; |
| |
| if (copy_to_sgsn2) |
| gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn2_nsei); |
| |
| return gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn_nsei); |
| err_no_peer: |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/BSS) cannot find peer based on NSEI\n", |
| nsei); |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
| return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
| err_mand_ie: |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/BSS) missing mandatory RA IE\n", |
| nsei); |
| rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| } |
| |
| /* Receive paging request from SGSN, we need to relay to proper BSS */ |
| static int gbprox_rx_paging(struct gbproxy_config *cfg, struct msgb *msg, struct tlv_parsed *tp, |
| uint32_t nsei, uint16_t ns_bvci) |
| { |
| struct gbproxy_nse *nse; |
| struct gbproxy_peer *peer; |
| unsigned int n_nses = 0; |
| int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
| |
| /* FIXME: Handle paging logic to only page each matching NSE */ |
| |
| LOGP(DGPRS, LOGL_INFO, "NSE(%05u/SGSN) BSSGP PAGING\n", |
| nsei); |
| if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
| peer = gbproxy_peer_by_bvci(cfg, bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP PAGING: " |
| "unable to route: BVCI=%05u unknown\n", nsei, bvci); |
| rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
| return -EINVAL; |
| } |
| LOGPBVC(peer, LOGL_INFO, "routing by BVCI\n"); |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
| errctr = GBPROX_GLOB_CTR_INV_RAI; |
| /* iterate over all peers and dispatch the paging to each matching one */ |
| llist_for_each_entry(nse, &cfg->nse_peers, list) { |
| llist_for_each_entry(peer, &nse->bts_peers, list) { |
| if (!memcmp(peer->ra, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA), 6)) { |
| LOGPNSE(nse, LOGL_INFO, "routing to NSE (RAI match)\n"); |
| gbprox_relay2nse(msg, nse, ns_bvci); |
| n_nses++; |
| /* Only send it once to each NSE */ |
| break; |
| } |
| } |
| } |
| } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
| errctr = GBPROX_GLOB_CTR_INV_LAI; |
| /* iterate over all peers and dispatch the paging to each matching one */ |
| llist_for_each_entry(nse, &cfg->nse_peers, list) { |
| llist_for_each_entry(peer, &nse->bts_peers, list) { |
| if (!memcmp(peer->ra, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA), 5)) { |
| LOGPNSE(nse, LOGL_INFO, "routing to NSE (LAI match)\n"); |
| gbprox_relay2nse(msg, nse, ns_bvci); |
| n_nses++; |
| /* Only send it once to each NSE */ |
| break; |
| } |
| } |
| } |
| } else if (TLVP_PRESENT(tp, BSSGP_IE_BSS_AREA_ID)) { |
| /* iterate over all peers and dispatch the paging to each matching one */ |
| llist_for_each_entry(nse, &cfg->nse_peers, list) { |
| llist_for_each_entry(peer, &nse->bts_peers, list) { |
| LOGPNSE(nse, LOGL_INFO, "routing to NSE (broadcast)\n"); |
| gbprox_relay2nse(msg, nse, ns_bvci); |
| n_nses++; |
| /* Only send it once to each NSE */ |
| break; |
| } |
| } |
| } else { |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BSSGP PAGING: " |
| "unable to route, missing IE\n", nsei); |
| rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
| } |
| |
| if (n_nses == 0) { |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BSSGP PAGING: " |
| "unable to route, no destination found\n", nsei); |
| rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
| return -EINVAL; |
| } |
| return 0; |
| } |
| |
| /* Receive an incoming BVC-RESET message from the SGSN */ |
| static int rx_reset_from_sgsn(struct gbproxy_config *cfg, |
| struct msgb *orig_msg, |
| struct msgb *msg, struct tlv_parsed *tp, |
| uint32_t nsei, uint16_t ns_bvci) |
| { |
| struct gbproxy_nse *nse; |
| struct gbproxy_peer *peer; |
| uint16_t ptp_bvci; |
| |
| if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| NULL, orig_msg); |
| } |
| ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| |
| if (ptp_bvci >= 2) { |
| /* A reset for a PTP BVC was received, forward it to its |
| * respective peer */ |
| peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
| if (!peer) { |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BVCI=%05u: Cannot find BSS\n", |
| nsei, ptp_bvci); |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| &ptp_bvci, orig_msg); |
| } |
| return gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| /* A reset for the Signalling entity has been received |
| * from the SGSN. As the signalling BVCI is shared |
| * among all the BSS's that we multiplex, it needs to |
| * be relayed */ |
| llist_for_each_entry(nse, &cfg->nse_peers, list) { |
| llist_for_each_entry(peer, &nse->bts_peers, list) |
| gbprox_relay2peer(msg, peer, ns_bvci); |
| } |
| |
| return 0; |
| } |
| |
| /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
| static int gbprox_rx_sig_from_sgsn(struct gbproxy_config *cfg, |
| struct msgb *orig_msg, uint32_t nsei, |
| uint16_t ns_bvci) |
| { |
| struct bssgp_normal_hdr *bgph = |
| (struct bssgp_normal_hdr *) msgb_bssgph(orig_msg); |
| struct tlv_parsed tp; |
| uint8_t pdu_type = bgph->pdu_type; |
| int data_len; |
| struct gbproxy_nse *nse; |
| struct gbproxy_peer *peer; |
| uint16_t bvci; |
| struct msgb *msg; |
| int rc = 0; |
| int cause; |
| |
| if (ns_bvci != 0 && ns_bvci != 1) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BVCI=%05u is not " |
| "signalling\n", nsei, ns_bvci); |
| /* FIXME: Send proper error message */ |
| return -EINVAL; |
| } |
| |
| /* we actually should never see those two for BVCI == 0, but double-check |
| * just to make sure */ |
| if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) UNITDATA not allowed in " |
| "signalling\n", nsei); |
| return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, orig_msg); |
| } |
| |
| msg = bssgp_msgb_copy(orig_msg, "rx_sig_from_sgsn"); |
| gbprox_process_bssgp_dl(cfg, msg, NULL); |
| /* Update message info */ |
| bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| data_len = msgb_bssgp_len(orig_msg) - sizeof(*bgph); |
| rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| |
| switch (pdu_type) { |
| case BSSGP_PDUT_BVC_RESET: |
| rc = rx_reset_from_sgsn(cfg, msg, orig_msg, &tp, nsei, ns_bvci); |
| break; |
| case BSSGP_PDUT_BVC_RESET_ACK: |
| if (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei) |
| break; |
| /* simple case: BVCI IE is mandatory */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| goto err_mand_ie; |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| if (bvci == BVCI_SIGNALLING) { |
| /* TODO: Reset all PTP BVCIs */ |
| } else { |
| rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
| } |
| break; |
| case BSSGP_PDUT_FLUSH_LL: |
| /* simple case: BVCI IE is mandatory */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| goto err_mand_ie; |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
| break; |
| case BSSGP_PDUT_PAGING_PS: |
| case BSSGP_PDUT_PAGING_CS: |
| /* process the paging request (LAI/RAI lookup) */ |
| rc = gbprox_rx_paging(cfg, msg, &tp, nsei, ns_bvci); |
| break; |
| case BSSGP_PDUT_STATUS: |
| /* Some exception has occurred */ |
| LOGP(DGPRS, LOGL_NOTICE, |
| "NSE(%05u/SGSN) BSSGP STATUS ", nsei); |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| goto err_mand_ie; |
| } |
| cause = *TLVP_VAL(&tp, BSSGP_IE_CAUSE); |
| LOGPC(DGPRS, LOGL_NOTICE, |
| "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| bssgp_cause_str(cause)); |
| if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| LOGPC(DGPRS, LOGL_NOTICE, "BVCI=%05u\n", bvci); |
| |
| if (cause == BSSGP_CAUSE_UNKNOWN_BVCI) |
| rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
| } else |
| LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| break; |
| /* those only exist in the SGSN -> BSS direction */ |
| case BSSGP_PDUT_SUSPEND_ACK: |
| case BSSGP_PDUT_SUSPEND_NACK: |
| case BSSGP_PDUT_RESUME_ACK: |
| case BSSGP_PDUT_RESUME_NACK: |
| /* RAI IE is mandatory */ |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| goto err_mand_ie; |
| peer = gbproxy_peer_by_rai(cfg, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
| if (!peer) |
| goto err_no_peer; |
| rc = gbprox_relay2peer(msg, peer, ns_bvci); |
| break; |
| case BSSGP_PDUT_BVC_BLOCK_ACK: |
| case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| goto err_mand_ie; |
| bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| if (bvci == 0) { |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP " |
| "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
| pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| /* TODO: should we send STATUS ? */ |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| } else { |
| /* Mark BVC as (un)blocked */ |
| block_unblock_peer(cfg, bvci, pdu_type); |
| } |
| rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
| break; |
| case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
| case BSSGP_PDUT_OVERLOAD: |
| LOGP(DGPRS, LOGL_DEBUG, |
| "NSE(%05u/SGSN) BSSGP %s: broadcasting\n", nsei, bssgp_pdu_str(pdu_type)); |
| /* broadcast to all BSS-side peers */ |
| llist_for_each_entry(nse, &cfg->nse_peers, list) { |
| gbprox_relay2nse(msg, nse, 0); |
| } |
| break; |
| default: |
| LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP PDU type %s not supported\n", nsei, |
| bssgp_pdu_str(pdu_type)); |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
| rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, orig_msg); |
| break; |
| } |
| |
| msgb_free(msg); |
| |
| return rc; |
| err_mand_ie: |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) missing mandatory IE\n", |
| nsei); |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
| msgb_free(msg); |
| return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, orig_msg); |
| err_no_peer: |
| LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) cannot find peer based on RAI\n", |
| nsei); |
| rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
| msgb_free(msg); |
| return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, orig_msg); |
| } |
| |
| static int gbproxy_is_sgsn_nsei(struct gbproxy_config *cfg, uint16_t nsei) |
| { |
| return nsei == cfg->nsip_sgsn_nsei || |
| (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei); |
| } |
| |
| int gbprox_bssgp_send_cb(void *ctx, struct msgb *msg) |
| { |
| int rc; |
| struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| struct gprs_ns2_inst *nsi = cfg->nsi; |
| struct osmo_gprs_ns2_prim nsp = {}; |
| |
| nsp.bvci = msgb_bvci(msg); |
| nsp.nsei = msgb_nsei(msg); |
| |
| osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, PRIM_OP_REQUEST, msg); |
| rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
| |
| return rc; |
| } |
| |
| /* Main input function for Gb proxy */ |
| int gbprox_rcvmsg(void *ctx, struct msgb *msg) |
| { |
| int rc; |
| uint16_t nsei = msgb_nsei(msg); |
| uint16_t ns_bvci = msgb_bvci(msg); |
| struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| |
| int remote_end_is_sgsn = gbproxy_is_sgsn_nsei(cfg, nsei); |
| |
| /* Only BVCI=0 messages need special treatment */ |
| if (ns_bvci == 0 || ns_bvci == 1) { |
| if (remote_end_is_sgsn) |
| rc = gbprox_rx_sig_from_sgsn(cfg, msg, nsei, ns_bvci); |
| else |
| rc = gbprox_rx_sig_from_bss(cfg, msg, nsei, ns_bvci); |
| } else { |
| /* All other BVCI are PTP */ |
| if (remote_end_is_sgsn) |
| rc = gbprox_rx_ptp_from_sgsn(cfg, msg, nsei, |
| ns_bvci); |
| else |
| rc = gbprox_rx_ptp_from_bss(cfg, msg, nsei, |
| ns_bvci); |
| } |
| |
| return rc; |
| } |
| |
| /* TODO: What about handling: |
| * NS_AFF_CAUSE_VC_FAILURE, |
| NS_AFF_CAUSE_VC_RECOVERY, |
| NS_AFF_CAUSE_FAILURE, |
| NS_AFF_CAUSE_RECOVERY, |
| osmocom own causes |
| NS_AFF_CAUSE_SNS_CONFIGURED, |
| NS_AFF_CAUSE_SNS_FAILURE, |
| */ |
| |
| void gprs_ns_prim_status_cb(struct gbproxy_config *cfg, struct osmo_gprs_ns2_prim *nsp) |
| { |
| /* TODO: bss nsei available/unavailable bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, peer->bvci, 0); |
| * TODO: sgsn nsei available/unavailable |
| */ |
| struct gbproxy_peer *peer; |
| |
| switch (nsp->u.status.cause) { |
| case NS_AFF_CAUSE_SNS_FAILURE: |
| case NS_AFF_CAUSE_SNS_CONFIGURED: |
| break; |
| |
| case NS_AFF_CAUSE_RECOVERY: |
| LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became available\n", nsp->nsei); |
| if (nsp->nsei == cfg->nsip_sgsn_nsei) { |
| /* look-up or create the BTS context for this BVC */ |
| struct bssgp_bvc_ctx *bctx = btsctx_by_bvci_nsei(nsp->bvci, nsp->nsei); |
| if (!bctx) |
| bctx = btsctx_alloc(nsp->bvci, nsp->nsei); |
| |
| bssgp_tx_bvc_reset_nsei_bvci(cfg->nsip_sgsn_nsei, 0, BSSGP_CAUSE_OML_INTERV, NULL, 0); |
| } |
| break; |
| case NS_AFF_CAUSE_FAILURE: |
| if (nsp->nsei == cfg->nsip_sgsn_nsei) { |
| /* sgsn */ |
| /* TODO: BSVC: block all PtP towards bss */ |
| rate_ctr_inc(&cfg->ctrg-> |
| ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
| } else { |
| /* bss became unavailable |
| * TODO: Block all BVC belonging to that NSE */ |
| peer = gbproxy_peer_by_nsei(cfg, nsp->nsei); |
| if (!peer) { |
| /* TODO: use primitive name + status cause name */ |
| LOGP(DGPRS, LOGL_NOTICE, "Received ns2 primitive %d for unknown peer NSEI=%u\n", |
| nsp->u.status.cause, nsp->nsei); |
| break; |
| } |
| |
| if (!peer->blocked) |
| break; |
| bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, cfg->nsip_sgsn_nsei, |
| peer->bvci, 0); |
| } |
| LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became unavailable\n", nsp->nsei); |
| break; |
| default: |
| LOGP(DPCU, LOGL_NOTICE, "NS: Unknown NS-STATUS.ind cause=%s from NS\n", |
| gprs_ns2_aff_cause_prim_str(nsp->u.status.cause)); |
| break; |
| } |
| } |
| |
| /* called by the ns layer */ |
| int gprs_ns2_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| { |
| struct osmo_gprs_ns2_prim *nsp; |
| struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| uintptr_t bvci; |
| int rc = 0; |
| |
| if (oph->sap != SAP_NS) |
| return 0; |
| |
| nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph); |
| |
| if (oph->operation != PRIM_OP_INDICATION) { |
| LOGP(DPCU, LOGL_NOTICE, "NS: Unexpected primitive operation %s from NS\n", |
| get_value_string(osmo_prim_op_names, oph->operation)); |
| return 0; |
| } |
| |
| switch (oph->primitive) { |
| case PRIM_NS_UNIT_DATA: |
| |
| /* hand the message into the BSSGP implementation */ |
| msgb_bssgph(oph->msg) = oph->msg->l3h; |
| msgb_bvci(oph->msg) = nsp->bvci; |
| msgb_nsei(oph->msg) = nsp->nsei; |
| bvci = nsp->bvci | BVC_LOG_CTX_FLAG; |
| |
| log_set_context(LOG_CTX_GB_BVC, (void *)bvci); |
| rc = gbprox_rcvmsg(cfg, oph->msg); |
| msgb_free(oph->msg); |
| break; |
| case PRIM_NS_STATUS: |
| gprs_ns_prim_status_cb(cfg, nsp); |
| break; |
| default: |
| LOGP(DPCU, LOGL_NOTICE, "NS: Unknown prim %s %s from NS\n", |
| gprs_ns2_prim_str(oph->primitive), |
| get_value_string(osmo_prim_op_names, oph->operation)); |
| break; |
| } |
| |
| return rc; |
| } |
| |
| void gbprox_reset(struct gbproxy_config *cfg) |
| { |
| struct gbproxy_nse *nse, *ntmp; |
| |
| llist_for_each_entry_safe(nse, ntmp, &cfg->nse_peers, list) { |
| struct gbproxy_peer *peer, *tmp; |
| llist_for_each_entry_safe(peer, tmp, &nse->bts_peers, list) |
| gbproxy_peer_free(peer); |
| |
| gbproxy_nse_free(nse); |
| } |
| |
| rate_ctr_group_free(cfg->ctrg); |
| gbproxy_init_config(cfg); |
| } |
| |
| int gbproxy_init_config(struct gbproxy_config *cfg) |
| { |
| struct timespec tp; |
| |
| INIT_LLIST_HEAD(&cfg->nse_peers); |
| cfg->ctrg = rate_ctr_group_alloc(tall_sgsn_ctx, &global_ctrg_desc, 0); |
| if (!cfg->ctrg) { |
| LOGP(DGPRS, LOGL_ERROR, "Cannot allocate global counter group!\n"); |
| return -1; |
| } |
| osmo_clock_gettime(CLOCK_REALTIME, &tp); |
| |
| return 0; |
| } |