/* NS-over-IP proxy */ /* (C) 2010 by Harald Welte * (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 . * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include enum gbprox_global_ctr { GBPROX_GLOB_CTR_INV_BVCI, GBPROX_GLOB_CTR_INV_LAI, GBPROX_GLOB_CTR_INV_RAI, GBPROX_GLOB_CTR_INV_NSEI, GBPROX_GLOB_CTR_PROTO_ERR_BSS, GBPROX_GLOB_CTR_PROTO_ERR_SGSN, GBPROX_GLOB_CTR_NOT_SUPPORTED_BSS, GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN, GBPROX_GLOB_CTR_RESTART_RESET_SGSN, GBPROX_GLOB_CTR_TX_ERR_SGSN, GBPROX_GLOB_CTR_OTHER_ERR, GBPROX_GLOB_CTR_PATCH_PEER_ERR, }; 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, }; enum gbprox_peer_ctr { GBPROX_PEER_CTR_BLOCKED, GBPROX_PEER_CTR_UNBLOCKED, GBPROX_PEER_CTR_DROPPED, GBPROX_PEER_CTR_INV_NSEI, GBPROX_PEER_CTR_TX_ERR, GBPROX_PEER_CTR_RAID_PATCHED_BSS, GBPROX_PEER_CTR_RAID_PATCHED_SGSN, GBPROX_PEER_CTR_APN_PATCHED, GBPROX_PEER_CTR_PATCH_CRYPT_ERR, GBPROX_PEER_CTR_PATCH_ERR, GBPROX_PEER_CTR_ATTACH_REQS, GBPROX_PEER_CTR_ATTACH_REJS, GBPROX_PEER_CTR_TLLI_CACHE_SIZE, }; static const struct rate_ctr_desc peer_ctr_description[] = { { "blocked", "BVC Block " }, { "unblocked", "BVC Unblock " }, { "dropped", "BVC blocked, dropped packet " }, { "inv-nsei", "NSEI mismatch " }, { "tx-err", "NS Transmission error " }, { "raid-mod.bss", "RAID patched (BSS )" }, { "raid-mod.sgsn", "RAID patched (SGSN)" }, { "apn-mod.sgsn", "APN patched " }, { "mod-crypt-err", "Patch error: encrypted " }, { "mod-err", "Patch error: other " }, { "attach-reqs", "Attach Request count " }, { "attach-rejs", "Attach Reject count " }, { "tlli-cache", "TLLI cache size " }, }; static const struct rate_ctr_group_desc peer_ctrg_desc = { .group_name_prefix = "gbproxy.peer", .group_description = "GBProxy Peer Statistics", .num_ctr = ARRAY_SIZE(peer_ctr_description), .ctr_desc = peer_ctr_description, }; static void gbprox_delete_tllis(struct gbproxy_peer *peer); /* Find the gbprox_peer by its BVCI */ static struct gbproxy_peer *peer_by_bvci(struct gbproxy_config *cfg, uint16_t bvci) { struct gbproxy_peer *peer; llist_for_each_entry(peer, &cfg->bts_peers, list) { if (peer->bvci == bvci) return peer; } return NULL; } /* Find the gbprox_peer by its NSEI */ struct gbproxy_peer *gbprox_peer_by_nsei(struct gbproxy_config *cfg, uint16_t nsei) { struct gbproxy_peer *peer; llist_for_each_entry(peer, &cfg->bts_peers, list) { if (peer->nsei == nsei) return peer; } return NULL; } /* look-up a peer by its Routeing Area Identification (RAI) */ static struct gbproxy_peer *peer_by_rai(struct gbproxy_config *cfg, const uint8_t *ra) { struct gbproxy_peer *peer; llist_for_each_entry(peer, &cfg->bts_peers, list) { if (!memcmp(peer->ra, ra, 6)) return peer; } return NULL; } /* look-up a peer by its Location Area Identification (LAI) */ static struct gbproxy_peer *peer_by_lai(struct gbproxy_config *cfg, const uint8_t *la) { struct gbproxy_peer *peer; llist_for_each_entry(peer, &cfg->bts_peers, list) { if (!memcmp(peer->ra, la, 5)) return peer; } return NULL; } /* look-up a peer by its Location Area Code (LAC) */ static struct gbproxy_peer *peer_by_lac(struct gbproxy_config *cfg, const uint8_t *la) { struct gbproxy_peer *peer; llist_for_each_entry(peer, &cfg->bts_peers, list) { if (!memcmp(peer->ra + 3, la + 3, 2)) return peer; } return NULL; } static int check_peer_nsei(struct gbproxy_peer *peer, uint16_t nsei) { if (peer->nsei != nsei) { LOGP(DGPRS, LOGL_NOTICE, "Peer entry doesn't match current NSEI " "BVCI=%u via NSEI=%u (expected NSEI=%u)\n", peer->bvci, nsei, peer->nsei); rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); return 0; } return 1; } struct gbproxy_peer *gbproxy_peer_alloc(struct gbproxy_config *cfg, uint16_t bvci) { struct gbproxy_peer *peer; peer = talloc_zero(tall_bsc_ctx, struct gbproxy_peer); if (!peer) return NULL; peer->bvci = bvci; peer->ctrg = rate_ctr_group_alloc(peer, &peer_ctrg_desc, bvci); peer->cfg = cfg; llist_add(&peer->list, &cfg->bts_peers); INIT_LLIST_HEAD(&peer->patch_state.enabled_tllis); return peer; } void gbproxy_peer_free(struct gbproxy_peer *peer) { llist_del(&peer->list); gbprox_delete_tllis(peer); rate_ctr_group_free(peer->ctrg); peer->ctrg = NULL; talloc_free(peer); } /* 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); } /* TODO: Move shift functions to libosmocore */ int v_fixed_shift(uint8_t **data, size_t *data_len, size_t len, uint8_t **value) { if (len > *data_len) goto fail; if (value) *value = *data; *data += len; *data_len -= len; return len; fail: *data += *data_len; *data_len = 0; return -1; } int tv_fixed_match(uint8_t **data, size_t *data_len, uint8_t tag, size_t len, uint8_t **value) { size_t ie_len; if (*data_len == 0) goto fail; if ((*data)[0] != tag) return 0; if (len > *data_len - 1) goto fail; if (value) *value = *data + 1; ie_len = len + 1; *data += ie_len; *data_len -= ie_len; return ie_len; fail: *data += *data_len; *data_len = 0; return -1; } int tlv_match(uint8_t **data, size_t *data_len, uint8_t tag, uint8_t **value, size_t *value_len) { size_t len; size_t ie_len; if (*data_len < 2) goto fail; if ((*data)[0] != tag) return 0; len = (*data)[1]; if (len > *data_len - 2) goto fail; if (value) *value = *data + 2; if (value_len) *value_len = len; ie_len = len + 2; *data += ie_len; *data_len -= ie_len; return ie_len; fail: *data += *data_len; *data_len = 0; return -1; } int lv_shift(uint8_t **data, size_t *data_len, uint8_t **value, size_t *value_len) { size_t len; size_t ie_len; if (*data_len < 1) goto fail; len = (*data)[0]; if (len > *data_len - 1) goto fail; if (value) *value = *data + 1; if (value_len) *value_len = len; ie_len = len + 1; *data += ie_len; *data_len -= ie_len; return ie_len; fail: *data += *data_len; *data_len = 0; return -1; } /* GSM 04.08, 10.5.1.4 */ static int is_mi_tmsi(const uint8_t *value, size_t value_len) { if (value_len != GSM48_TMSI_LEN) return 0; if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_TMSI) return 0; return 1; } /* GSM 04.08, 10.5.1.4 */ static int is_mi_imsi(const uint8_t *value, size_t value_len) { if (value_len == 0) return 0; if (!value || (value[0] & GSM_MI_TYPE_MASK) != GSM_MI_TYPE_IMSI) return 0; return 1; } static int parse_mi_tmsi(const uint8_t *value, size_t value_len, uint32_t *tmsi) { uint32_t tmsi_be; if (!is_mi_tmsi(value, value_len)) return 0; memcpy(&tmsi_be, value + 1, sizeof(tmsi_be)); *tmsi = ntohl(tmsi_be); return 1; } struct gbproxy_parse_context { /* Pointer to protocol specific parts */ struct gsm48_hdr *g48_hdr; struct bssgp_normal_hdr *bgp_hdr; struct bssgp_ud_hdr *bud_hdr; uint8_t *bssgp_data; size_t bssgp_data_len; uint8_t *llc; size_t llc_len; /* Extracted information */ struct gprs_llc_hdr_parsed llc_hdr_parsed; struct tlv_parsed bssgp_tp; int to_bss; uint8_t *tlli_enc; uint8_t *imsi; size_t imsi_len; uint8_t *apn_ie; size_t apn_ie_len; uint8_t *ptmsi_enc; uint8_t *new_ptmsi_enc; uint8_t *raid_enc; uint8_t *bssgp_raid_enc; uint8_t *bssgp_ptimsi; /* General info */ const char *llc_msg_name; int invalidate_tlli; int need_decryption; uint32_t tlli; int pdu_type; }; static struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer, uint32_t tlli) { struct gbproxy_tlli_info *tlli_info; struct gbproxy_patch_state *state = &peer->patch_state; llist_for_each_entry(tlli_info, &state->enabled_tllis, list) if (tlli_info->tlli == tlli) return tlli_info; return NULL; } struct gbproxy_tlli_info *gbprox_find_tlli_by_mi( struct gbproxy_peer *peer, const uint8_t *mi_data, size_t mi_data_len) { struct gbproxy_tlli_info *tlli_info; struct gbproxy_patch_state *state = &peer->patch_state; if (!is_mi_imsi(mi_data, mi_data_len)) return NULL; llist_for_each_entry(tlli_info, &state->enabled_tllis, list) { if (tlli_info->mi_data_len != mi_data_len) continue; if (memcmp(tlli_info->mi_data, mi_data, mi_data_len) != 0) continue; return tlli_info; } return NULL; } void gbprox_delete_tlli(struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info) { struct gbproxy_patch_state *state = &peer->patch_state; llist_del(&tlli_info->list); talloc_free(tlli_info); state->enabled_tllis_count -= 1; peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = state->enabled_tllis_count; } static void gbprox_delete_tllis(struct gbproxy_peer *peer) { struct gbproxy_tlli_info *tlli_info, *nxt; struct gbproxy_patch_state *state = &peer->patch_state; llist_for_each_entry_safe(tlli_info, nxt, &state->enabled_tllis, list) gbprox_delete_tlli(peer, tlli_info); OSMO_ASSERT(state->enabled_tllis_count == 0); OSMO_ASSERT(llist_empty(&state->enabled_tllis)); } void gbprox_clear_patch_filter(struct gbproxy_config *cfg) { if (cfg->check_imsi) { regfree(&cfg->imsi_re_comp); cfg->check_imsi = 0; } } int gbprox_set_patch_filter(struct gbproxy_config *cfg, const char *filter, const char **err_msg) { static char err_buf[300]; int rc; gbprox_clear_patch_filter(cfg); if (!filter) return 0; rc = regcomp(&cfg->imsi_re_comp, filter, REG_EXTENDED | REG_NOSUB | REG_ICASE); if (rc == 0) { cfg->check_imsi = 1; return 0; } if (err_msg) { regerror(rc, &cfg->imsi_re_comp, err_buf, sizeof(err_buf)); *err_msg = err_buf; } return -1; } int gbprox_check_imsi(struct gbproxy_peer *peer, const uint8_t *imsi, size_t imsi_len) { char mi_buf[200]; int rc; if (!peer->cfg->check_imsi) return 1; rc = is_mi_imsi(imsi, imsi_len); if (rc > 0) rc = gsm48_mi_to_string(mi_buf, sizeof(mi_buf), imsi, imsi_len); if (rc <= 0) { LOGP(DGPRS, LOGL_NOTICE, "Invalid IMSI %s\n", osmo_hexdump(imsi, imsi_len)); return -1; } LOGP(DGPRS, LOGL_DEBUG, "Checking IMSI '%s' (%d)\n", mi_buf, rc); rc = regexec(&peer->cfg->imsi_re_comp, mi_buf, 0, NULL, 0); if (rc == REG_NOMATCH) { LOGP(DGPRS, LOGL_INFO, "IMSI '%s' doesn't match pattern '%s'\n", mi_buf, peer->cfg->match_re); return 0; } return 1; } static void gbprox_attach_tlli_info(struct gbproxy_peer *peer, time_t now, struct gbproxy_tlli_info *tlli_info) { struct gbproxy_patch_state *state = &peer->patch_state; tlli_info->timestamp = now; llist_add(&tlli_info->list, &state->enabled_tllis); state->enabled_tllis_count += 1; peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = state->enabled_tllis_count; } int gbprox_remove_stale_tllis(struct gbproxy_peer *peer, time_t now) { struct gbproxy_patch_state *state = &peer->patch_state; int exceeded_max_len = 0; int deleted_count = 0; int check_for_age; if (peer->cfg->tlli_max_len > 0) exceeded_max_len = state->enabled_tllis_count - peer->cfg->tlli_max_len; check_for_age = peer->cfg->tlli_max_age > 0; for (; exceeded_max_len > 0; exceeded_max_len--) { struct gbproxy_tlli_info *tlli_info; OSMO_ASSERT(!llist_empty(&state->enabled_tllis)); tlli_info = llist_entry(state->enabled_tllis.prev, struct gbproxy_tlli_info, list); LOGP(DGPRS, LOGL_INFO, "Removing TLLI %08x from list " "(stale, length %d, max_len exceeded)\n", tlli_info->tlli, state->enabled_tllis_count); gbprox_delete_tlli(peer, tlli_info); deleted_count += 1; } while (check_for_age && !llist_empty(&state->enabled_tllis)) { time_t age; struct gbproxy_tlli_info *tlli_info; tlli_info = llist_entry(state->enabled_tllis.prev, struct gbproxy_tlli_info, list); age = now - tlli_info->timestamp; /* age < 0 only happens after system time jumps, discard entry */ if (age <= peer->cfg->tlli_max_age && age >= 0) { check_for_age = 0; continue; } LOGP(DGPRS, LOGL_INFO, "Removing TLLI %08x from list " "(stale, age %d, max_age exceeded)\n", tlli_info->tlli, (int)age); gbprox_delete_tlli(peer, tlli_info); deleted_count += 1; } return deleted_count; } static struct gbproxy_tlli_info *gbprox_get_detached_tlli_info( struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, uint32_t tlli) { struct gbproxy_patch_state *state = &peer->patch_state; if (!tlli_info) { tlli_info = talloc_zero(peer, struct gbproxy_tlli_info); tlli_info->tlli = tlli; } else { llist_del(&tlli_info->list); OSMO_ASSERT(state->enabled_tllis_count > 0); state->enabled_tllis_count -= 1; peer->ctrg->ctr[GBPROX_PEER_CTR_TLLI_CACHE_SIZE].current = state->enabled_tllis_count; } return tlli_info; } static void gbprox_update_tlli_info(struct gbproxy_tlli_info *tlli_info, const uint8_t *imsi, size_t imsi_len) { if (!is_mi_imsi(imsi, imsi_len)) return; tlli_info->mi_data_len = imsi_len; tlli_info->mi_data = talloc_realloc_size(tlli_info, tlli_info->mi_data, imsi_len); OSMO_ASSERT(tlli_info->mi_data != NULL); memcpy(tlli_info->mi_data, imsi, imsi_len); } void gbprox_reassign_tlli(struct gbproxy_tlli_info *tlli_info, struct gbproxy_peer *peer, uint32_t new_tlli) { if (new_tlli == tlli_info->tlli) return; LOGP(DGPRS, LOGL_INFO, "The TLLI has been reassigned from %08x to %08x\n", tlli_info->tlli, new_tlli); /* TODO: Save old TLLI */ tlli_info->tlli = new_tlli; } void gbprox_touch_tlli(struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, time_t now) { gbprox_get_detached_tlli_info(peer, tlli_info, tlli_info->tlli); gbprox_attach_tlli_info(peer, now, tlli_info); } struct gbproxy_tlli_info *gbprox_register_tlli( struct gbproxy_peer *peer, uint32_t tlli, const uint8_t *imsi, size_t imsi_len, time_t now) { struct gbproxy_tlli_info *tlli_info; int enable_patching = -1; int tlli_already_known; /* Check, whether the IMSI matches */ if (is_mi_imsi(imsi, imsi_len)) { enable_patching = gbprox_check_imsi(peer, imsi, imsi_len); if (enable_patching < 0) return NULL; } tlli_info = gbprox_find_tlli(peer, tlli); if (!tlli_info) { tlli_info = gbprox_find_tlli_by_mi(peer, imsi, imsi_len); if (tlli_info) { /* TLLI has changed somehow, adjust it */ LOGP(DGPRS, LOGL_INFO, "The TLLI has changed from %08x to %08x\n", tlli_info->tlli, tlli); tlli_info->tlli = tlli; } } tlli_already_known = tlli_info != NULL; tlli_info = gbprox_get_detached_tlli_info(peer, tlli_info, tlli); OSMO_ASSERT(tlli_info != NULL); if (!tlli_already_known) LOGP(DGPRS, LOGL_INFO, "Adding TLLI %08x to list\n", tlli); gbprox_attach_tlli_info(peer, now, tlli_info); gbprox_update_tlli_info(tlli_info, imsi, imsi_len); if (enable_patching >= 0) tlli_info->enable_patching = enable_patching; return tlli_info; } static void gbprox_unregister_tlli(struct gbproxy_peer *peer, uint32_t tlli) { struct gbproxy_tlli_info *tlli_info; tlli_info = gbprox_find_tlli(peer, tlli); if (tlli_info) { LOGP(DGPRS, LOGL_INFO, "Removing TLLI %08x from list\n", tlli); gbprox_delete_tlli(peer, tlli_info); } } static int gbprox_check_tlli(struct gbproxy_peer *peer, uint32_t tlli) { struct gbproxy_tlli_info *tlli_info; LOGP(DGPRS, LOGL_INFO, "Checking TLLI %08x, class: %d\n", tlli, gprs_tlli_type(tlli)); if (!peer->cfg->check_imsi) return 1; tlli_info = gbprox_find_tlli(peer, tlli); return tlli_info != NULL && tlli_info->enable_patching; } /* check whether patching is enabled at this level */ static int patching_is_enabled(struct gbproxy_peer *peer, enum gbproxy_patch_mode need_at_least) { enum gbproxy_patch_mode patch_mode = peer->cfg->patch_mode; if (patch_mode == GBPROX_PATCH_DEFAULT) patch_mode = GBPROX_PATCH_LLC; return need_at_least <= patch_mode; } /* check whether patching is enabled at this level */ static int patching_is_required(struct gbproxy_peer *peer, enum gbproxy_patch_mode need_at_least) { return need_at_least <= peer->cfg->patch_mode; } /* patch RA identifier in place, update peer accordingly */ static void gbprox_patch_raid(uint8_t *raid_enc, struct gbproxy_peer *peer, int to_bss, const char *log_text) { struct gbproxy_patch_state *state = &peer->patch_state; const int old_local_mcc = state->local_mcc; const int old_local_mnc = state->local_mnc; int old_mcc; int old_mnc; struct gprs_ra_id raid; gsm48_parse_ra(&raid, raid_enc); old_mcc = raid.mcc; old_mnc = raid.mnc; if (!to_bss) { /* BSS -> SGSN */ /* save BSS side MCC/MNC */ if (!peer->cfg->core_mcc || raid.mcc == peer->cfg->core_mcc) { state->local_mcc = 0; } else { state->local_mcc = raid.mcc; raid.mcc = peer->cfg->core_mcc; } if (!peer->cfg->core_mnc || raid.mnc == peer->cfg->core_mnc) { state->local_mnc = 0; } else { state->local_mnc = raid.mnc; raid.mnc = peer->cfg->core_mnc; } } else { /* SGSN -> BSS */ if (state->local_mcc) raid.mcc = state->local_mcc; if (state->local_mnc) raid.mnc = state->local_mnc; } if (old_local_mcc != state->local_mcc || old_local_mnc != state->local_mnc) LOGP(DGPRS, LOGL_NOTICE, "Patching RAID %sactivated, msg: %s, " "local: %d-%d, core: %d-%d, to %s\n", state->local_mcc || state->local_mnc ? "" : "de", log_text, state->local_mcc, state->local_mnc, peer->cfg->core_mcc, peer->cfg->core_mnc, to_bss ? "BSS" : "SGSN"); if (state->local_mcc || state->local_mnc) { enum gbprox_peer_ctr counter = to_bss ? GBPROX_PEER_CTR_RAID_PATCHED_SGSN : GBPROX_PEER_CTR_RAID_PATCHED_BSS; LOGP(DGPRS, LOGL_DEBUG, "Patching %s to %s: " "%d-%d-%d-%d -> %d-%d-%d-%d\n", log_text, to_bss ? "BSS" : "SGSN", old_mcc, old_mnc, raid.lac, raid.rac, raid.mcc, raid.mnc, raid.lac, raid.rac); gsm48_construct_ra(raid_enc, &raid); rate_ctr_inc(&peer->ctrg->ctr[counter]); } } static void gbprox_patch_apn_ie(struct msgb *msg, uint8_t *apn_ie, size_t apn_ie_len, struct gbproxy_peer *peer, size_t *new_apn_ie_len, const char *log_text) { struct apn_ie_hdr { uint8_t iei; uint8_t apn_len; uint8_t apn[0]; } *hdr = (void *)apn_ie; size_t apn_len = hdr->apn_len; uint8_t *apn = hdr->apn; OSMO_ASSERT(apn_ie_len == apn_len + sizeof(struct apn_ie_hdr)); OSMO_ASSERT(apn_ie_len > 2 && apn_ie_len <= 102); if (peer->cfg->core_apn_size == 0) { char str1[110]; /* Remove the IE */ LOGP(DGPRS, LOGL_DEBUG, "Patching %s to SGSN: Removing APN '%s'\n", log_text, gprs_apn_to_str(str1, apn, apn_len)); *new_apn_ie_len = 0; gprs_msgb_resize_area(msg, apn_ie, apn_ie_len, 0); } else { /* Resize the IE */ char str1[110]; char str2[110]; OSMO_ASSERT(peer->cfg->core_apn_size <= 100); LOGP(DGPRS, LOGL_DEBUG, "Patching %s to SGSN: " "Replacing APN '%s' -> '%s'\n", log_text, gprs_apn_to_str(str1, apn, apn_len), gprs_apn_to_str(str2, peer->cfg->core_apn, peer->cfg->core_apn_size)); *new_apn_ie_len = peer->cfg->core_apn_size + 2; gprs_msgb_resize_area(msg, apn, apn_len, peer->cfg->core_apn_size); memcpy(apn, peer->cfg->core_apn, peer->cfg->core_apn_size); hdr->apn_len = peer->cfg->core_apn_size; } rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_APN_PATCHED]); } static int gbprox_parse_gmm_attach_req(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "ATTACH_REQ"; /* Skip MS network capability */ if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || value_len < 1 || value_len > 2) /* invalid */ return 0;; /* Skip Attach type */ /* Skip Ciphering key sequence number */ /* Skip DRX parameter */ v_fixed_shift(&data, &data_len, 3, NULL); /* Get Mobile identity */ if (lv_shift(&data, &data_len, &value, &value_len) <= 0 || value_len < 5 || value_len > 8) /* invalid */ return 0; if (is_mi_tmsi(value, value_len)) { parse_ctx->ptmsi_enc = value; } else if (is_mi_imsi(value, value_len)) { parse_ctx->imsi = value; parse_ctx->imsi_len = value_len; } if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) return 0; parse_ctx->raid_enc = value; return 1; } static int gbprox_parse_gmm_attach_ack(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "ATTACH_ACK"; /* Skip Attach result */ /* Skip Force to standby */ /* Skip Periodic RA update timer */ /* Skip Radio priority for SMS */ /* Skip Spare half octet */ v_fixed_shift(&data, &data_len, 3, NULL); if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) return 0; parse_ctx->raid_enc = value; /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); /* Skip Negotiated READY timer value (GPRS timer, opt, TV, length 2) */ tv_fixed_match(&data, &data_len, GSM48_IE_GMM_TIMER_READY, 1, NULL); /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, &value, &value_len) > 0 && is_mi_tmsi(value, value_len)) parse_ctx->new_ptmsi_enc = value; return 1; } static int gbprox_parse_gmm_detach_req(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; int detach_type; int power_off; parse_ctx->llc_msg_name = "DETACH_REQ"; /* Skip spare half octet */ /* Get Detach type */ if (v_fixed_shift(&data, &data_len, 1, &value) <= 0) /* invalid */ return 0; detach_type = *value & 0x07; power_off = *value & 0x08 ? 1 : 0; if (!parse_ctx->to_bss) { /* Mobile originated */ if (power_off) parse_ctx->invalidate_tlli = 1; /* Get P-TMSI (Mobile identity), see GSM 24.008, 9.4.5.2 */ if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, &value, &value_len) > 0) { if (is_mi_tmsi(value, value_len)) parse_ctx->ptmsi_enc = value; } } return 1; } static int gbprox_parse_gmm_ra_upd_req(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; parse_ctx->llc_msg_name = "RA_UPD_REQ"; /* Skip Update type */ /* Skip GPRS ciphering key sequence number */ v_fixed_shift(&data, &data_len, 1, NULL); if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) return 0; parse_ctx->raid_enc = value; return 1; } static int gbprox_parse_gmm_ra_upd_ack(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "RA_UPD_ACK"; /* Skip Force to standby */ /* Skip Update result */ /* Skip Periodic RA update timer */ v_fixed_shift(&data, &data_len, 2, NULL); if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) return 0; parse_ctx->raid_enc = value; /* Skip P-TMSI signature (P-TMSI signature, opt, TV, length 4) */ tv_fixed_match(&data, &data_len, GSM48_IE_GMM_PTMSI_SIG, 3, NULL); /* Allocated P-TMSI (Mobile identity, opt, TLV, length 7) */ if (tlv_match(&data, &data_len, GSM48_IE_GMM_ALLOC_PTMSI, &value, &value_len) > 0 && is_mi_tmsi(value, value_len)) parse_ctx->new_ptmsi_enc = value; return 1; } static int gbprox_parse_gmm_ptmsi_reall_cmd(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "PTMSI_REALL_CMD"; LOGP(DLLC, LOGL_NOTICE, "Got P-TMSI Reallocation Command which is not covered by unit tests yet.\n"); /* Allocated P-TMSI */ if (lv_shift(&data, &data_len, &value, &value_len) > 0 && is_mi_tmsi(value, value_len)) parse_ctx->new_ptmsi_enc = value; if (v_fixed_shift(&data, &data_len, 6, &value) <= 0) return 0; parse_ctx->raid_enc = value; return 1; } static int gbprox_parse_gmm_id_resp(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "ID_RESP"; /* Mobile identity, Mobile identity 10.5.1.4, M LV 2-10 */ if (lv_shift(&data, &data_len, &value, &value_len) <= 0 || value_len < 1 || value_len > 9) /* invalid */ return 0; if (is_mi_tmsi(value, value_len)) { parse_ctx->ptmsi_enc = value; } else if (is_mi_imsi(value, value_len)) { parse_ctx->imsi = value; parse_ctx->imsi_len = value_len; } return 1; } static int gbprox_parse_gsm_act_pdp_req(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { ssize_t old_len; uint8_t *value; size_t value_len; parse_ctx->llc_msg_name = "ACT_PDP_REQ"; /* Skip Requested NSAPI */ /* Skip Requested LLC SAPI */ v_fixed_shift(&data, &data_len, 2, NULL); /* Skip Requested QoS (support 04.08 and 24.008) */ if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || value_len < 4 || value_len > 14) /* invalid */ return 0;; /* Skip Requested PDP address */ if (lv_shift(&data, &data_len, NULL, &value_len) <= 0 || value_len < 2 || value_len > 18) /* invalid */ return 0; /* Access point name */ old_len = tlv_match(&data, &data_len, GSM48_IE_GSM_APN, &value, &value_len); if (old_len > 0 && value_len >=1 && value_len <= 100) { parse_ctx->apn_ie = data - old_len; parse_ctx->apn_ie_len = old_len; } return 1; } struct gbproxy_peer *peer_by_bssgp_tlv(struct gbproxy_config *cfg, struct tlv_parsed *tp) { if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { uint16_t bvci; bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); if (bvci >= 2) return peer_by_bvci(cfg, bvci); } if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { uint8_t *rai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); /* Only compare LAC part, since MCC/MNC are possibly patched. * Since the LAC of different BSS must be different when * MCC/MNC are patched, collisions shouldn't happen. */ return peer_by_lac(cfg, rai); } if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { uint8_t *lai = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA); return peer_by_lac(cfg, lai); } return NULL; } static int gbprox_parse_dtap(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); static int gbprox_parse_dtap(uint8_t *data, size_t data_len, struct gbproxy_parse_context *parse_ctx) { struct gsm48_hdr *g48h; if (v_fixed_shift(&data, &data_len, sizeof(*g48h), (uint8_t **)&g48h) <= 0) return 0; parse_ctx->g48_hdr = g48h; if ((g48h->proto_discr & 0x0f) != GSM48_PDISC_MM_GPRS && (g48h->proto_discr & 0x0f) != GSM48_PDISC_SM_GPRS) return 1; switch (g48h->msg_type) { case GSM48_MT_GMM_ATTACH_REQ: return gbprox_parse_gmm_attach_req(data, data_len, parse_ctx); case GSM48_MT_GMM_ATTACH_ACK: return gbprox_parse_gmm_attach_ack(data, data_len, parse_ctx); case GSM48_MT_GMM_RA_UPD_REQ: return gbprox_parse_gmm_ra_upd_req(data, data_len, parse_ctx); case GSM48_MT_GMM_RA_UPD_ACK: return gbprox_parse_gmm_ra_upd_ack(data, data_len, parse_ctx); case GSM48_MT_GMM_PTMSI_REALL_CMD: return gbprox_parse_gmm_ptmsi_reall_cmd(data, data_len, parse_ctx); case GSM48_MT_GSM_ACT_PDP_REQ: return gbprox_parse_gsm_act_pdp_req(data, data_len, parse_ctx); case GSM48_MT_GMM_ID_RESP: return gbprox_parse_gmm_id_resp(data, data_len, parse_ctx); case GSM48_MT_GMM_DETACH_REQ: return gbprox_parse_gmm_detach_req(data, data_len, parse_ctx); case GSM48_MT_GMM_DETACH_ACK: parse_ctx->llc_msg_name = "DETACH_ACK"; parse_ctx->invalidate_tlli = 1; break; default: break; }; return 1; } static int allow_message_patching(struct gbproxy_peer *peer, int msg_type) { if (msg_type >= GSM48_MT_GSM_ACT_PDP_REQ) { return patching_is_enabled(peer, GBPROX_PATCH_LLC_GSM); } else if (msg_type > GSM48_MT_GMM_ATTACH_REJ) { return patching_is_enabled(peer, GBPROX_PATCH_LLC); } else if (msg_type > GSM48_MT_GMM_ATTACH_REQ) { return patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH); } else { return patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH_REQ); } } static int gbprox_parse_llc(uint8_t *llc, size_t llc_len, struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); static int gbprox_parse_llc(uint8_t *llc, size_t llc_len, struct gbproxy_parse_context *parse_ctx) { struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed; int rc; int fcs; /* parse LLC */ rc = gprs_llc_hdr_parse(ghp, llc, llc_len); gprs_llc_hdr_dump(ghp); if (rc != 0) { LOGP(DLLC, LOGL_NOTICE, "Error during LLC header parsing\n"); return 0; } fcs = gprs_llc_fcs(llc, ghp->crc_length); LOGP(DLLC, LOGL_DEBUG, "Got LLC message, CRC: %06x (computed %06x)\n", ghp->fcs, fcs); if (!ghp->data) return 0; if (ghp->sapi != GPRS_SAPI_GMM) return 0; if (ghp->cmd != GPRS_LLC_UI) return 0; if (ghp->is_encrypted) { parse_ctx->need_decryption = 1; return 0; } return gbprox_parse_dtap(ghp->data, ghp->data_len, parse_ctx); } static int gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, int *len_change, struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); static int gbprox_patch_llc(struct msgb *msg, uint8_t *llc, size_t llc_len, struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, int *len_change, struct gbproxy_parse_context *parse_ctx) { struct gprs_llc_hdr_parsed *ghp = &parse_ctx->llc_hdr_parsed; int have_patched = 0; int fcs; if (!allow_message_patching(peer, parse_ctx->g48_hdr->msg_type)) return have_patched; if (parse_ctx->raid_enc) { gbprox_patch_raid(parse_ctx->raid_enc, peer, parse_ctx->to_bss, parse_ctx->llc_msg_name); have_patched = 1; } if (parse_ctx->apn_ie && peer->cfg->core_apn && !parse_ctx->to_bss && gbprox_check_tlli(peer, parse_ctx->tlli)) { size_t new_len; gbprox_patch_apn_ie(msg, parse_ctx->apn_ie, parse_ctx->apn_ie_len, peer, &new_len, parse_ctx->llc_msg_name); *len_change += (int)new_len - (int)parse_ctx->apn_ie_len; have_patched = 1; } if (have_patched) { llc_len += *len_change; ghp->crc_length += *len_change; /* Fix FCS */ fcs = gprs_llc_fcs(llc, ghp->crc_length); LOGP(DLLC, LOGL_DEBUG, "Updated LLC message, CRC: %06x -> %06x\n", ghp->fcs, fcs); llc[llc_len - 3] = fcs & 0xff; llc[llc_len - 2] = (fcs >> 8) & 0xff; llc[llc_len - 1] = (fcs >> 16) & 0xff; } return have_patched; } static void gbprox_log_parse_context(struct gbproxy_parse_context *parse_ctx, const char *default_msg_name) { const char *msg_name = default_msg_name; const char *sep = ""; if (!parse_ctx->tlli_enc && !parse_ctx->ptmsi_enc && !parse_ctx->new_ptmsi_enc && !parse_ctx->imsi) return; if (parse_ctx->llc_msg_name) msg_name = parse_ctx->llc_msg_name; LOGP(DGPRS, LOGL_DEBUG, "%s: Got", msg_name); if (parse_ctx->tlli_enc) { LOGP(DGPRS, LOGL_DEBUG, "%s TLLI %08x", sep, parse_ctx->tlli); sep = ","; } if (parse_ctx->ptmsi_enc) { uint32_t ptmsi = GSM_RESERVED_TMSI; int ok; ok = parse_mi_tmsi(parse_ctx->ptmsi_enc, GSM48_TMSI_LEN, &ptmsi); LOGP(DGPRS, LOGL_DEBUG, "%s PTMSI %08x%s", sep, ptmsi, ok ? "" : " (parse error)"); sep = ","; } if (parse_ctx->new_ptmsi_enc) { uint32_t new_ptmsi = GSM_RESERVED_TMSI; int ok; ok = parse_mi_tmsi(parse_ctx->new_ptmsi_enc, GSM48_TMSI_LEN, &new_ptmsi); LOGP(DGPRS, LOGL_DEBUG, "%s new PTMSI %08x%s", sep, new_ptmsi, ok ? "" : " (parse error)"); sep = ","; } if (parse_ctx->imsi) { char mi_buf[200]; mi_buf[0] = '\0'; gsm48_mi_to_string(mi_buf, sizeof(mi_buf), parse_ctx->imsi, parse_ctx->imsi_len); LOGP(DGPRS, LOGL_DEBUG, "%s IMSI %s", sep, mi_buf); sep = ","; } if (parse_ctx->invalidate_tlli) { LOGP(DGPRS, LOGL_DEBUG, "%s invalidate", sep); sep = ","; } LOGP(DGPRS, LOGL_DEBUG, "\n"); } static struct gbproxy_tlli_info *gbprox_update_state( struct gbproxy_peer *peer, time_t now, struct gbproxy_parse_context *parse_ctx) { struct gbproxy_tlli_info *tlli_info = NULL; if (!peer->cfg->check_imsi) return NULL; if (parse_ctx->tlli_enc) tlli_info = gbprox_find_tlli(peer, parse_ctx->tlli); 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_ATTACH_REJ: rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); break; default: break; } } gbprox_log_parse_context(parse_ctx, "BSSGP"); if (parse_ctx->tlli_enc && parse_ctx->new_ptmsi_enc && parse_ctx->to_bss) { /* A new PTMSI has been signaled in the message, * register new TLLI */ uint32_t new_ptmsi; uint32_t new_tlli; if (!parse_mi_tmsi(parse_ctx->new_ptmsi_enc, GSM48_TMSI_LEN, &new_ptmsi)) { LOGP(DGPRS, LOGL_ERROR, "Failed to parse new TLLI/PTMSI (current is %08x)\n", parse_ctx->tlli); return tlli_info; } new_tlli = gprs_tmsi2tlli(new_ptmsi, TLLI_LOCAL); LOGP(DGPRS, LOGL_INFO, "Got new TLLI/PTMSI %08x/%08x (current is %08x)\n", new_tlli, new_ptmsi, parse_ctx->tlli); if (tlli_info) { gbprox_reassign_tlli(tlli_info, peer, new_tlli); gbprox_touch_tlli(peer, tlli_info, now); } else { tlli_info = gbprox_register_tlli(peer, new_tlli, parse_ctx->imsi, parse_ctx->imsi_len, now); } } else if (parse_ctx->tlli_enc && parse_ctx->llc) { tlli_info = gbprox_register_tlli(peer, parse_ctx->tlli, parse_ctx->imsi, parse_ctx->imsi_len, now); } else if (tlli_info) { gbprox_touch_tlli(peer, tlli_info, now); } if (parse_ctx->imsi && tlli_info && tlli_info->mi_data_len == 0) gbprox_update_tlli_info(tlli_info, parse_ctx->imsi, parse_ctx->imsi_len); return tlli_info; } static void gbprox_update_state_after(struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, time_t now, struct gbproxy_parse_context *parse_ctx) { if (parse_ctx->invalidate_tlli) gbprox_unregister_tlli(peer, parse_ctx->tlli); gbprox_remove_stale_tllis(peer, now); } static int gbprox_parse_bssgp(uint8_t *bssgp, size_t bssgp_len, struct gbproxy_parse_context *parse_ctx) { struct bssgp_normal_hdr *bgph; struct bssgp_ud_hdr *budh = NULL; struct tlv_parsed *tp = &parse_ctx->bssgp_tp; uint8_t pdu_type; uint8_t *data; size_t data_len; int rc; if (bssgp_len < sizeof(struct bssgp_normal_hdr)) return 0; bgph = (struct bssgp_normal_hdr *)bssgp; pdu_type = bgph->pdu_type; if (pdu_type == BSSGP_PDUT_UL_UNITDATA || pdu_type == BSSGP_PDUT_DL_UNITDATA) { if (bssgp_len < sizeof(struct bssgp_ud_hdr)) return 0; budh = (struct bssgp_ud_hdr *)bssgp; bgph = NULL; data = budh->data; data_len = bssgp_len - sizeof(*budh); } else { data = bgph->data; data_len = bssgp_len - sizeof(*bgph); } if (bssgp_tlv_parse(tp, data, data_len) < 0) return 0; parse_ctx->pdu_type = pdu_type; parse_ctx->bud_hdr = budh; parse_ctx->bgp_hdr = bgph; parse_ctx->bssgp_data = data; parse_ctx->bssgp_data_len = data_len; if (budh) parse_ctx->tlli_enc = (uint8_t *)&budh->tlli; if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA); if (TLVP_PRESENT(tp, BSSGP_IE_CELL_ID)) parse_ctx->bssgp_raid_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_CELL_ID); if (TLVP_PRESENT(tp, BSSGP_IE_IMSI)) { parse_ctx->imsi = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_IMSI); parse_ctx->imsi_len = TLVP_LEN(tp, BSSGP_IE_IMSI); } if (TLVP_PRESENT(tp, BSSGP_IE_TLLI)) parse_ctx->tlli_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TLLI); if (TLVP_PRESENT(tp, BSSGP_IE_TMSI) && pdu_type == BSSGP_PDUT_PAGING_PS) parse_ctx->ptmsi_enc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_TMSI); if (TLVP_PRESENT(tp, BSSGP_IE_LLC_PDU)) { uint8_t *llc = (uint8_t *)TLVP_VAL(tp, BSSGP_IE_LLC_PDU); size_t llc_len = TLVP_LEN(tp, BSSGP_IE_LLC_PDU); rc = gbprox_parse_llc(llc, llc_len, parse_ctx); if (!rc) return 0; parse_ctx->llc = llc; parse_ctx->llc_len = llc_len; } if (parse_ctx->tlli_enc) { uint32_t tmp_tlli; memcpy(&tmp_tlli, parse_ctx->tlli_enc, sizeof(tmp_tlli)); parse_ctx->tlli = ntohl(tmp_tlli); } return 1; } /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ static void gbprox_patch_bssgp(struct msgb *msg, uint8_t *bssgp, size_t bssgp_len, struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, int *len_change, struct gbproxy_parse_context *parse_ctx) __attribute__((nonnull)); static void gbprox_patch_bssgp(struct msgb *msg, uint8_t *bssgp, size_t bssgp_len, struct gbproxy_peer *peer, struct gbproxy_tlli_info *tlli_info, int *len_change, struct gbproxy_parse_context *parse_ctx) { const char *err_info = NULL; int err_ctr = -1; if (!patching_is_enabled(peer, GBPROX_PATCH_BSSGP)) return; if (parse_ctx->bssgp_raid_enc) gbprox_patch_raid(parse_ctx->bssgp_raid_enc, peer, parse_ctx->to_bss, "BSSGP"); if (!patching_is_enabled(peer, GBPROX_PATCH_LLC_ATTACH_REQ)) return; if (parse_ctx->need_decryption && patching_is_required(peer, GBPROX_PATCH_LLC_ATTACH)) { /* Patching LLC messages has been requested * explicitly, but the message (including the * type) is encrypted, so we possibly fail to * patch the LLC part of the message. */ err_ctr = GBPROX_PEER_CTR_PATCH_CRYPT_ERR; err_info = "GMM message is encrypted"; goto patch_error; } if (parse_ctx->llc) { uint8_t *llc = parse_ctx->llc; size_t llc_len = parse_ctx->llc_len; int llc_len_change = 0; gbprox_patch_llc(msg, llc, llc_len, peer, tlli_info, &llc_len_change, parse_ctx); /* Note that the APN might have been resized here, but no * pointer int the parse_ctx will refer to an adress after the * APN. So it's possible to patch first and do the TLLI * handling afterwards. */ if (llc_len_change) { llc_len += llc_len_change; /* Fix LLC IE len */ /* TODO: This is a kludge, but the a pointer to the * start of the IE is not available here */ if (llc[-2] == BSSGP_IE_LLC_PDU && llc[-1] & 0x80) { /* most probably a one byte length */ if (llc_len > 127) { err_info = "Cannot increase size"; err_ctr = GBPROX_PEER_CTR_PATCH_ERR; goto patch_error; } llc[-1] = llc_len | 0x80; } else { llc[-2] = (llc_len >> 8) & 0x7f; llc[-1] = llc_len & 0xff; } *len_change += llc_len_change; } /* Note that the tp struct might contain invalid pointers here * if the LLC field has changed its size */ parse_ctx->llc_len = llc_len; } return; patch_error: OSMO_ASSERT(err_ctr >= 0); rate_ctr_inc(&peer->ctrg->ctr[err_ctr]); LOGP(DGPRS, LOGL_ERROR, "Failed to patch BSSGP message as requested: %s.\n", err_info); } /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ static void gbprox_process_bssgp_message(struct gbproxy_config *cfg, struct msgb *msg, struct gbproxy_peer *peer, int to_bss) { struct gbproxy_parse_context parse_ctx = {0}; int rc; int len_change = 0; time_t now; struct gbproxy_tlli_info *tlli_info; if (!cfg->core_mcc && !cfg->core_mnc && !cfg->core_apn) return; parse_ctx.to_bss = to_bss; rc = gbprox_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), &parse_ctx); if (!rc) { if (!parse_ctx.need_decryption) { LOGP(DGPRS, LOGL_ERROR, "Failed to parse BSSGP/GMM message\n"); return; } } if (!peer && msgb_bvci(msg) >= 2) peer = peer_by_bvci(cfg, msgb_bvci(msg)); if (!peer && !to_bss) peer = gbprox_peer_by_nsei(cfg, msgb_nsei(msg)); if (!peer) peer = peer_by_bssgp_tlv(cfg, &parse_ctx.bssgp_tp); if (!peer) { LOGP(DLLC, LOGL_INFO, "NSEI=%d(%s) patching: didn't find peer for message, " "PDU %d\n", msgb_nsei(msg), to_bss ? "SGSN" : "BSS", parse_ctx.pdu_type); /* Increment counter */ rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); return; } now = time(NULL); tlli_info = gbprox_update_state(peer, now, &parse_ctx); gbprox_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), peer, tlli_info, &len_change, &parse_ctx); gbprox_update_state_after(peer, tlli_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, struct gbproxy_peer *peer, uint16_t ns_bvci) { /* create a copy of the message so the old one can * be free()d safely when we return from gbprox_rcvmsg() */ struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2sgsn"); int rc; gbprox_process_bssgp_message(cfg, msg, peer, 0); DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", msgb_nsei(msg), ns_bvci, cfg->nsip_sgsn_nsei); msgb_bvci(msg) = ns_bvci; msgb_nsei(msg) = cfg->nsip_sgsn_nsei; strip_ns_hdr(msg); rc = gprs_ns_sendmsg(bssgp_nsi, msg); if (rc < 0) rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); 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) { /* create a copy of the message so the old one can * be free()d safely when we return from gbprox_rcvmsg() */ struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2peer"); int rc; DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n", msgb_nsei(msg), ns_bvci, peer->nsei); msgb_bvci(msg) = ns_bvci; msgb_nsei(msg) = peer->nsei; /* Strip the old NS header, it will be replaced with a new one */ strip_ns_hdr(msg); rc = gprs_ns_sendmsg(bssgp_nsi, msg); 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 = peer_by_bvci(cfg, ptp_bvci); if (!peer) { LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: 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 = 1; rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); break; case BSSGP_PDUT_BVC_UNBLOCK_ACK: peer->blocked = 0; 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 = peer_by_bvci(cfg, ptp_bvci); if (!peer) { LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: 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 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; if (ns_bvci != 0 && ns_bvci != 1) { LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u 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, "NSEI=%u 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 = gbprox_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); LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " "RAI snooping: RAI %u-%u-%u-%u behind BVCI=%u\n", nsei, raid.mcc, raid.mnc, raid.lac, raid.rac , from_peer->bvci); /* FIXME: This only supports one BSS per RA */ break; case BSSGP_PDUT_BVC_RESET: /* 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) */ if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", nsei, bvci); if (bvci == 0) { /* FIXME: only do this if SGSN is alive! */ LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " "BVC RESET ACK of BVCI=0\n", nsei); return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, nsei, 0, ns_bvci); } from_peer = peer_by_bvci(cfg, bvci); if (!from_peer) { /* if a PTP-BVC is reset, and we don't know that * PTP-BVCI yet, we should allocate a new peer */ LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " "BVCI=%u via NSEI=%u\n", bvci, nsei); from_peer = gbproxy_peer_alloc(cfg, bvci); from_peer->nsei = nsei; } if (!check_peer_nsei(from_peer, nsei)) from_peer->nsei = nsei; 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); LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " "Cell ID %u-%u-%u-%u\n", nsei, bvci, raid.mcc, raid.mnc, raid.lac, raid.rac); } } break; } /* Normally, we can simply pass on all signalling messages from BSS to * SGSN */ return gbprox_relay2sgsn(cfg, msg, from_peer, ns_bvci); err_no_peer: LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(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_UNKNOWN_BVCI, NULL, msg); err_mand_ie: LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(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_peer *peer = NULL; int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", nsei); if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", bvci); errctr = GBPROX_GLOB_CTR_OTHER_ERR; } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { peer = peer_by_rai(cfg, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); LOGPC(DGPRS, LOGL_INFO, "routing by RAI to peer BVCI=%u\n", peer ? peer->bvci : -1); errctr = GBPROX_GLOB_CTR_INV_RAI; } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { peer = peer_by_lai(cfg, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); LOGPC(DGPRS, LOGL_INFO, "routing by LAI to peer BVCI=%u\n", peer ? peer->bvci : -1); errctr = GBPROX_GLOB_CTR_INV_LAI; } else LOGPC(DGPRS, LOGL_INFO, "\n"); if (!peer) { LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " "unable to route, missing IE\n", nsei); rate_ctr_inc(&cfg->ctrg->ctr[errctr]); return -EINVAL; } return gbprox_relay2peer(msg, peer, ns_bvci); } /* Receive an incoming BVC-RESET message from the SGSN */ static int rx_reset_from_sgsn(struct gbproxy_config *cfg, struct msgb *msg, struct tlv_parsed *tp, uint32_t nsei, uint16_t ns_bvci) { 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, 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 = peer_by_bvci(cfg, ptp_bvci); if (!peer) { LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: 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, NULL, 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(peer, &cfg->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 *msg, uint32_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 *peer; uint16_t bvci; int rc = 0; if (ns_bvci != 0 && ns_bvci != 1) { LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u 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, "NSEI=%u(SGSN) UNITDATA not allowed in " "signalling\n", nsei); return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); } rc = bssgp_tlv_parse(&tp, bgph->data, data_len); switch (pdu_type) { case BSSGP_PDUT_BVC_RESET: rc = rx_reset_from_sgsn(cfg, msg, &tp, nsei, ns_bvci); break; case BSSGP_PDUT_FLUSH_LL: case BSSGP_PDUT_BVC_RESET_ACK: /* 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, "NSEI=%u(SGSN) BSSGP STATUS ", nsei); if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { LOGPC(DGPRS, LOGL_NOTICE, "\n"); goto err_mand_ie; } LOGPC(DGPRS, LOGL_NOTICE, "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); LOGPC(DGPRS, LOGL_NOTICE, "BVCI=%u\n", ntohs(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 = 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, "NSEI=%u(SGSN) BSSGP " "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); /* 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: LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsei); rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN]); rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); break; default: LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", pdu_type); rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); break; } return rc; err_mand_ie: LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", nsei); rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); err_no_peer: LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) cannot find peer based on RAI\n", nsei); rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); } /* Main input function for Gb proxy */ int gbprox_rcvmsg(struct gbproxy_config *cfg, struct msgb *msg, uint16_t nsei, uint16_t ns_bvci, uint16_t nsvci) { int rc; struct gbproxy_peer *peer; int remote_end_is_sgsn = nsei == cfg->nsip_sgsn_nsei; if (remote_end_is_sgsn) gbprox_process_bssgp_message(cfg, msg, NULL, 1); /* 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 { peer = peer_by_bvci(cfg, ns_bvci); /* All other BVCI are PTP and thus can be simply forwarded */ if (!remote_end_is_sgsn) { if (peer) check_peer_nsei(peer, nsei); return gbprox_relay2sgsn(cfg, msg, peer, ns_bvci); } /* else: SGSN -> BSS direction */ if (!peer) { LOGP(DGPRS, LOGL_INFO, "Didn't find peer for " "BVCI=%u for message from NSVC=%u/NSEI=%u (SGSN)\n", ns_bvci, nsvci, 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) { LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", ns_bvci, nsvci, nsei); rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); } rc = gbprox_relay2peer(msg, peer, ns_bvci); } return rc; } int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) { struct gprs_nsvc *nsvc; llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { if (!nsvc->persistent) continue; gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); } return 0; } /* Signal handler for signals from NS layer */ int gbprox_signal(unsigned int subsys, unsigned int signal, void *handler_data, void *signal_data) { struct gbproxy_config *cfg = handler_data; struct ns_signal_data *nssd = signal_data; struct gprs_nsvc *nsvc = nssd->nsvc; struct gbproxy_peer *peer; if (subsys != SS_L_NS) return 0; if (signal == S_NS_RESET && nsvc->nsei == cfg->nsip_sgsn_nsei) { /* We have received a NS-RESET from the NSEI and NSVC * of the SGSN. This might happen with SGSN that start * their own NS-RESET procedure without waiting for our * NS-RESET */ nsvc->remote_end_is_sgsn = 1; } if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " "re-starting RESET procedure\n"); rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, nsvc->nsei, nsvc->nsvci); } if (!nsvc->remote_end_is_sgsn) { /* from BSS to SGSN */ peer = gbprox_peer_by_nsei(cfg, nsvc->nsei); if (!peer) { LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, nsvc->nsvci); return 0; } switch (signal) { case S_NS_RESET: case S_NS_BLOCK: if (!peer->blocked) break; LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", nsvc->nsei, nsvc->nsvci); bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, peer->bvci, 0); break; } } else { /* Forward this message to all NS-VC to BSS */ struct gprs_ns_inst *nsi = cfg->nsi; struct gprs_nsvc *next_nsvc; llist_for_each_entry(next_nsvc, &nsi->gprs_nsvcs, list) { if (next_nsvc->remote_end_is_sgsn) continue; /* Note that the following does not start the full * procedures including timer based retransmissions. */ switch (signal) { case S_NS_RESET: gprs_ns_tx_reset(next_nsvc, nssd->cause); break; case S_NS_BLOCK: gprs_ns_tx_block(next_nsvc, nssd->cause); break; case S_NS_UNBLOCK: gprs_ns_tx_unblock(next_nsvc); break; } } } return 0; } void gbprox_reset(struct gbproxy_config *cfg) { struct gbproxy_peer *peer, *tmp; llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) gbproxy_peer_free(peer); rate_ctr_group_free(cfg->ctrg); gbproxy_init_config(cfg); } int gbprox_cleanup_peers(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvci) { int counter = 0; struct gbproxy_peer *peer, *tmp; llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) { if (peer->nsei != nsei) continue; if (bvci && peer->bvci != bvci) continue; gbproxy_peer_free(peer); counter += 1; } return counter; } int gbproxy_init_config(struct gbproxy_config *cfg) { INIT_LLIST_HEAD(&cfg->bts_peers); cfg->ctrg = rate_ctr_group_alloc(tall_bsc_ctx, &global_ctrg_desc, 0); return 0; }