Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1 | /* NS-over-IP proxy */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 90267a9 | 2013-10-23 11:24:17 +0200 | [diff] [blame] | 4 | * (C) 2010-2013 by On-Waves |
| 5 | * (C) 2013 by Holger Hans Peter Freyther |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 9 | * it under the terms of the GNU Affero General Public License as published by |
| 10 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 16 | * GNU Affero General Public License for more details. |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 17 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 18 | * You should have received a copy of the GNU Affero General Public License |
| 19 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <unistd.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <getopt.h> |
| 28 | #include <errno.h> |
| 29 | #include <sys/fcntl.h> |
| 30 | #include <sys/stat.h> |
Harald Welte | 7fc9822 | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 31 | #include <arpa/inet.h> |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 32 | #include <time.h> |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 33 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 34 | #include <osmocom/core/talloc.h> |
| 35 | #include <osmocom/core/select.h> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 36 | #include <osmocom/core/rate_ctr.h> |
| 37 | |
Harald Welte | ea34a4e | 2012-06-16 14:59:56 +0800 | [diff] [blame] | 38 | #include <osmocom/gprs/gprs_ns.h> |
| 39 | #include <osmocom/gprs/gprs_bssgp.h> |
| 40 | |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 41 | #include <osmocom/gsm/gsm_utils.h> |
| 42 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 43 | #include <openbsc/signal.h> |
| 44 | #include <openbsc/debug.h> |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 45 | #include <openbsc/gprs_gb_parse.h> |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 46 | #include <openbsc/gb_proxy.h> |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 47 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 48 | #include <openbsc/gprs_llc.h> |
| 49 | #include <openbsc/gsm_04_08.h> |
| 50 | #include <openbsc/gsm_04_08_gprs.h> |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 51 | #include <openbsc/gprs_utils.h> |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 52 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 53 | static const struct rate_ctr_desc global_ctr_description[] = { |
| 54 | { "inv-bvci", "Invalid BVC Identifier " }, |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 55 | { "inv-lai", "Invalid Location Area Identifier" }, |
| 56 | { "inv-rai", "Invalid Routing Area Identifier " }, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 57 | { "inv-nsei", "No BVC established for NSEI " }, |
| 58 | { "proto-err.bss", "BSSGP protocol error (BSS )" }, |
| 59 | { "proto-err.sgsn", "BSSGP protocol error (SGSN)" }, |
| 60 | { "not-supp.bss", "Feature not supported (BSS )" }, |
| 61 | { "not-supp.sgsn", "Feature not supported (SGSN)" }, |
| 62 | { "restart.sgsn", "Restarted RESET procedure (SGSN)" }, |
| 63 | { "tx-err.sgsn", "NS Transmission error (SGSN)" }, |
| 64 | { "error", "Other error " }, |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 65 | { "mod-peer-err", "Patch error: no peer " }, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 66 | }; |
| 67 | |
| 68 | static const struct rate_ctr_group_desc global_ctrg_desc = { |
| 69 | .group_name_prefix = "gbproxy.global", |
| 70 | .group_description = "GBProxy Global Statistics", |
| 71 | .num_ctr = ARRAY_SIZE(global_ctr_description), |
| 72 | .ctr_desc = global_ctr_description, |
| 73 | }; |
| 74 | |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 75 | static int check_peer_nsei(struct gbproxy_peer *peer, uint16_t nsei) |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 76 | { |
| 77 | if (peer->nsei != nsei) { |
| 78 | LOGP(DGPRS, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
| 79 | "BVCI=%u via NSEI=%u (expected NSEI=%u)\n", |
| 80 | peer->bvci, nsei, peer->nsei); |
| 81 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 82 | return 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 83 | } |
| 84 | |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 85 | return 1; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 86 | } |
| 87 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 88 | /* strip off the NS header */ |
| 89 | static void strip_ns_hdr(struct msgb *msg) |
| 90 | { |
| 91 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 92 | msgb_pull(msg, strip_len); |
| 93 | } |
| 94 | |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 95 | /* update peer according to the BSS message */ |
| 96 | static void gbprox_update_current_raid(uint8_t *raid_enc, |
| 97 | struct gbproxy_peer *peer, |
| 98 | const char *log_text) |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 99 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 100 | struct gbproxy_patch_state *state = &peer->patch_state; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 101 | const int old_local_mcc = state->local_mcc; |
| 102 | const int old_local_mnc = state->local_mnc; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 103 | struct gprs_ra_id raid; |
| 104 | |
| 105 | if (!raid_enc) |
| 106 | return; |
| 107 | |
| 108 | gsm48_parse_ra(&raid, raid_enc); |
| 109 | |
| 110 | /* save source side MCC/MNC */ |
| 111 | if (!peer->cfg->core_mcc || raid.mcc == peer->cfg->core_mcc) { |
| 112 | state->local_mcc = 0; |
| 113 | } else { |
| 114 | state->local_mcc = raid.mcc; |
| 115 | } |
| 116 | |
| 117 | if (!peer->cfg->core_mnc || raid.mnc == peer->cfg->core_mnc) { |
| 118 | state->local_mnc = 0; |
| 119 | } else { |
| 120 | state->local_mnc = raid.mnc; |
| 121 | } |
| 122 | |
| 123 | if (old_local_mcc != state->local_mcc || |
| 124 | old_local_mnc != state->local_mnc) |
| 125 | LOGP(DGPRS, LOGL_NOTICE, |
| 126 | "Patching RAID %sactivated, msg: %s, " |
| 127 | "local: %d-%d, core: %d-%d\n", |
| 128 | state->local_mcc || state->local_mnc ? |
| 129 | "" : "de", |
| 130 | log_text, |
| 131 | state->local_mcc, state->local_mnc, |
| 132 | peer->cfg->core_mcc, peer->cfg->core_mnc); |
| 133 | } |
| 134 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 135 | uint32_t gbproxy_make_bss_ptmsi(struct gbproxy_peer *peer, |
| 136 | uint32_t sgsn_ptmsi) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 137 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 138 | uint32_t bss_ptmsi; |
| 139 | if (!peer->cfg->patch_ptmsi) { |
| 140 | bss_ptmsi = sgsn_ptmsi; |
| 141 | } else { |
| 142 | do { |
| 143 | bss_ptmsi = rand_r(&peer->cfg->bss_ptmsi_state); |
| 144 | bss_ptmsi = bss_ptmsi | 0xC0000000; |
| 145 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 146 | if (gbproxy_find_tlli_by_ptmsi(peer, bss_ptmsi)) |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 147 | bss_ptmsi = GSM_RESERVED_TMSI; |
| 148 | } while (bss_ptmsi == GSM_RESERVED_TMSI); |
| 149 | } |
| 150 | |
| 151 | return bss_ptmsi; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 152 | } |
| 153 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 154 | uint32_t gbproxy_make_sgsn_tlli(struct gbproxy_peer *peer, |
| 155 | struct gbproxy_tlli_info *tlli_info, |
| 156 | uint32_t bss_tlli) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 157 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 158 | uint32_t sgsn_tlli; |
| 159 | if (!peer->cfg->patch_ptmsi) { |
| 160 | sgsn_tlli = bss_tlli; |
| 161 | } else if (tlli_info->sgsn_tlli.ptmsi != GSM_RESERVED_TMSI) { |
| 162 | sgsn_tlli = gprs_tmsi2tlli(tlli_info->sgsn_tlli.ptmsi, |
| 163 | TLLI_FOREIGN); |
| 164 | } else { |
| 165 | do { |
| 166 | /* create random TLLI, 0b01111xxx... */ |
| 167 | sgsn_tlli = rand_r(&peer->cfg->sgsn_tlli_state); |
| 168 | sgsn_tlli = (sgsn_tlli & 0x7fffffff) | 0x78000000; |
| 169 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 170 | if (gbproxy_find_tlli_by_sgsn_tlli(peer, sgsn_tlli)) |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 171 | sgsn_tlli = 0; |
| 172 | } while (!sgsn_tlli); |
| 173 | } |
| 174 | return sgsn_tlli; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 175 | } |
| 176 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 177 | /* patch BSSGP message */ |
| 178 | static void gbprox_process_bssgp_ul(struct gbproxy_config *cfg, |
| 179 | struct msgb *msg, |
| 180 | struct gbproxy_peer *peer) |
Jacob Erlbeck | c812882 | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 181 | { |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 182 | struct gprs_gb_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 183 | int rc; |
Jacob Erlbeck | c812882 | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 184 | int len_change = 0; |
Jacob Erlbeck | 7b821d0 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 185 | time_t now; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 186 | struct gbproxy_tlli_info *tlli_info = NULL; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 187 | |
| 188 | if (!cfg->core_mcc && !cfg->core_mnc && !cfg->core_apn) |
| 189 | return; |
| 190 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 191 | parse_ctx.to_bss = 0; |
| 192 | |
| 193 | /* Parse BSSGP/LLC */ |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 194 | rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 195 | &parse_ctx); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 196 | |
| 197 | if (!rc) { |
| 198 | if (!parse_ctx.need_decryption) { |
| 199 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | 643d522 | 2014-08-18 17:26:04 +0200 | [diff] [blame] | 200 | "NSEI=%u(BSS) patching: " |
| 201 | "failed to parse BSSGP/GMM message\n", |
| 202 | msgb_nsei(msg)); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 203 | return; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* Get peer */ |
| 208 | if (!peer && msgb_bvci(msg) >= 2) |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 209 | peer = gbproxy_peer_by_bvci(cfg, msgb_bvci(msg)); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 210 | |
| 211 | if (!peer) |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 212 | peer = gbproxy_peer_by_nsei(cfg, msgb_nsei(msg)); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 213 | |
| 214 | if (!peer) |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 215 | peer = gbproxy_peer_by_bssgp_tlv(cfg, &parse_ctx.bssgp_tp); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 216 | |
| 217 | if (!peer) { |
| 218 | LOGP(DLLC, LOGL_INFO, |
| 219 | "NSEI=%d(BSS) patching: didn't find peer for message, " |
| 220 | "PDU %d\n", |
| 221 | msgb_nsei(msg), parse_ctx.pdu_type); |
| 222 | /* Increment counter */ |
| 223 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | now = time(NULL); |
| 228 | |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 229 | if (parse_ctx.bssgp_raid_enc && parse_ctx.old_raid_enc && |
| 230 | memcmp(parse_ctx.bssgp_raid_enc, parse_ctx.old_raid_enc, 6) == 0) |
| 231 | parse_ctx.old_raid_matches = 1; |
| 232 | |
| 233 | gbprox_update_current_raid(parse_ctx.bssgp_raid_enc, peer, |
| 234 | parse_ctx.llc_msg_name); |
| 235 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 236 | if (parse_ctx.g48_hdr) { |
| 237 | switch (parse_ctx.g48_hdr->msg_type) { |
| 238 | case GSM48_MT_GMM_ATTACH_REQ: |
| 239 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
| 240 | break; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 241 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 242 | default: |
| 243 | break; |
| 244 | } |
| 245 | } |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 246 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 247 | gprs_gb_log_parse_context(&parse_ctx, "BSSGP"); |
| 248 | |
| 249 | tlli_info = gbproxy_update_tlli_state_ul(peer, now, &parse_ctx); |
| 250 | |
| 251 | gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 252 | peer, tlli_info, &len_change, &parse_ctx); |
| 253 | |
| 254 | gbproxy_update_tlli_state_after(peer, tlli_info, now, &parse_ctx); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 255 | |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | /* patch BSSGP message to use core_mcc/mnc on the SGSN side */ |
| 260 | static void gbprox_process_bssgp_dl(struct gbproxy_config *cfg, |
| 261 | struct msgb *msg, |
| 262 | struct gbproxy_peer *peer) |
| 263 | { |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 264 | struct gprs_gb_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 265 | int rc; |
| 266 | int len_change = 0; |
| 267 | time_t now; |
| 268 | struct gbproxy_tlli_info *tlli_info = NULL; |
| 269 | |
| 270 | parse_ctx.to_bss = 1; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 271 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 272 | rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 273 | &parse_ctx); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 274 | |
| 275 | if (!rc) { |
| 276 | if (!parse_ctx.need_decryption) { |
| 277 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | 643d522 | 2014-08-18 17:26:04 +0200 | [diff] [blame] | 278 | "NSEI=%u(SGSN) patching: " |
| 279 | "failed to parse BSSGP/GMM message\n", |
| 280 | msgb_nsei(msg)); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 281 | return; |
| 282 | } |
| 283 | } |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 284 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 285 | if (!peer && msgb_bvci(msg) >= 2) |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 286 | peer = gbproxy_peer_by_bvci(cfg, msgb_bvci(msg)); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 287 | |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 288 | if (!peer) |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 289 | peer = gbproxy_peer_by_bssgp_tlv(cfg, &parse_ctx.bssgp_tp); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 290 | |
| 291 | if (!peer) { |
| 292 | LOGP(DLLC, LOGL_INFO, |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 293 | "NSEI=%d(SGSN) patching: didn't find peer for message, " |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 294 | "PDU %d\n", |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 295 | msgb_nsei(msg), parse_ctx.pdu_type); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 296 | /* Increment counter */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 297 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 298 | return; |
| 299 | } |
| 300 | |
Jacob Erlbeck | 7b821d0 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 301 | now = time(NULL); |
| 302 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 303 | if (parse_ctx.g48_hdr) { |
| 304 | switch (parse_ctx.g48_hdr->msg_type) { |
| 305 | case GSM48_MT_GMM_ATTACH_REJ: |
| 306 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
| 307 | break; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 308 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 309 | default: |
| 310 | break; |
| 311 | } |
| 312 | } |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 313 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 314 | gprs_gb_log_parse_context(&parse_ctx, "BSSGP"); |
| 315 | |
| 316 | tlli_info = gbproxy_update_tlli_state_dl(peer, now, &parse_ctx); |
| 317 | |
| 318 | gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 319 | peer, tlli_info, &len_change, &parse_ctx); |
| 320 | |
| 321 | gbproxy_update_tlli_state_after(peer, tlli_info, now, &parse_ctx); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 322 | |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 323 | return; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 324 | } |
| 325 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 326 | /* feed a message down the NS-VC associated with the specified peer */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 327 | static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 328 | struct gbproxy_peer *peer, uint16_t ns_bvci) |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 329 | { |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 330 | /* create a copy of the message so the old one can |
| 331 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 332 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2sgsn"); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 333 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 334 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 335 | gbprox_process_bssgp_ul(cfg, msg, peer); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 336 | |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 337 | DEBUGP(DGPRS, "NSEI=%u proxying BTS->SGSN (NS_BVCI=%u, NSEI=%u)\n", |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 338 | msgb_nsei(msg), ns_bvci, cfg->nsip_sgsn_nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 339 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 340 | msgb_bvci(msg) = ns_bvci; |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 341 | msgb_nsei(msg) = cfg->nsip_sgsn_nsei; |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 342 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 343 | strip_ns_hdr(msg); |
| 344 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 345 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 346 | if (rc < 0) |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 347 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 348 | |
| 349 | return rc; |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 350 | } |
| 351 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 352 | /* feed a message down the NS-VC associated with the specified peer */ |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 353 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_peer *peer, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 354 | uint16_t ns_bvci) |
| 355 | { |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 356 | /* create a copy of the message so the old one can |
| 357 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Holger Hans Peter Freyther | 7127b02 | 2014-08-04 11:52:52 +0200 | [diff] [blame] | 358 | struct msgb *msg = gprs_msgb_copy(old_msg, "msgb_relay2peer"); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 359 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 360 | |
Harald Welte | 0ab535b | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 361 | DEBUGP(DGPRS, "NSEI=%u proxying SGSN->BSS (NS_BVCI=%u, NSEI=%u)\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 362 | msgb_nsei(msg), ns_bvci, peer->nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 363 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 364 | msgb_bvci(msg) = ns_bvci; |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 365 | msgb_nsei(msg) = peer->nsei; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 366 | |
Harald Welte | 0ab535b | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 367 | /* Strip the old NS header, it will be replaced with a new one */ |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 368 | strip_ns_hdr(msg); |
| 369 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 370 | rc = gprs_ns_sendmsg(bssgp_nsi, msg); |
| 371 | if (rc < 0) |
| 372 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
| 373 | |
| 374 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 375 | } |
| 376 | |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 377 | static int block_unblock_peer(struct gbproxy_config *cfg, uint16_t ptp_bvci, uint8_t pdu_type) |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 378 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 379 | struct gbproxy_peer *peer; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 380 | |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 381 | peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 382 | if (!peer) { |
| 383 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
| 384 | ptp_bvci); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 385 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 386 | return -ENOENT; |
| 387 | } |
| 388 | |
| 389 | switch (pdu_type) { |
| 390 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 391 | peer->blocked = 1; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 392 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 393 | break; |
| 394 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 395 | peer->blocked = 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 396 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 397 | break; |
| 398 | default: |
| 399 | break; |
| 400 | } |
| 401 | return 0; |
| 402 | } |
| 403 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 404 | /* Send a message to a peer identified by ptp_bvci but using ns_bvci |
| 405 | * in the NS hdr */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 406 | static int gbprox_relay2bvci(struct gbproxy_config *cfg, struct msgb *msg, uint16_t ptp_bvci, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 407 | uint16_t ns_bvci) |
| 408 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 409 | struct gbproxy_peer *peer; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 410 | |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 411 | peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 412 | if (!peer) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 413 | LOGP(DGPRS, LOGL_ERROR, "BVCI=%u: Cannot find BSS\n", |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 414 | ptp_bvci); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 415 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 416 | return -ENOENT; |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 417 | } |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 418 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 419 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 420 | } |
| 421 | |
Harald Welte | b1fd902 | 2012-06-17 12:16:31 +0800 | [diff] [blame] | 422 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 423 | { |
| 424 | return 0; |
| 425 | } |
| 426 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 427 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 428 | static int gbprox_rx_sig_from_bss(struct gbproxy_config *cfg, |
| 429 | struct msgb *msg, uint16_t nsei, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 430 | uint16_t ns_bvci) |
| 431 | { |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 432 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 433 | struct tlv_parsed tp; |
| 434 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 435 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 436 | struct gbproxy_peer *from_peer = NULL; |
Harald Welte | 70f38d2 | 2010-05-01 12:10:57 +0200 | [diff] [blame] | 437 | struct gprs_ra_id raid; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 438 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 439 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 440 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u BVCI=%u is not signalling\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 441 | nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 442 | return -EINVAL; |
| 443 | } |
| 444 | |
| 445 | /* we actually should never see those two for BVCI == 0, but double-check |
| 446 | * just to make sure */ |
| 447 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 448 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 449 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 450 | "signalling\n", nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 451 | return -EINVAL; |
| 452 | } |
| 453 | |
| 454 | bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 455 | |
| 456 | switch (pdu_type) { |
| 457 | case BSSGP_PDUT_SUSPEND: |
| 458 | case BSSGP_PDUT_RESUME: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 459 | /* We implement RAI snooping during SUSPEND/RESUME, since it |
| 460 | * establishes a relationsip between BVCI/peer and the routeing |
| 461 | * area identification. The snooped information is then used |
| 462 | * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| 463 | * BSSGP */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 464 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 465 | goto err_mand_ie; |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 466 | from_peer = gbproxy_peer_by_nsei(cfg, nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 467 | if (!from_peer) |
| 468 | goto err_no_peer; |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 469 | memcpy(from_peer->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| 470 | sizeof(from_peer->ra)); |
Harald Welte | 7fc9822 | 2010-05-11 10:15:42 +0200 | [diff] [blame] | 471 | gsm48_parse_ra(&raid, from_peer->ra); |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 472 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u BSSGP SUSPEND/RESUME " |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 473 | "RAI snooping: RAI %u-%u-%u-%u behind BVCI=%u\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 474 | nsei, raid.mcc, raid.mnc, raid.lac, |
| 475 | raid.rac , from_peer->bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 476 | /* FIXME: This only supports one BSS per RA */ |
| 477 | break; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 478 | case BSSGP_PDUT_BVC_RESET: |
| 479 | /* If we receive a BVC reset on the signalling endpoint, we |
| 480 | * don't want the SGSN to reset, as the signalling endpoint |
| 481 | * is common for all point-to-point BVCs (and thus all BTS) */ |
| 482 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 483 | uint16_t bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 72953b8 | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 484 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Rx BVC RESET (BVCI=%u)\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 485 | nsei, bvci); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 486 | if (bvci == 0) { |
| 487 | /* FIXME: only do this if SGSN is alive! */ |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 488 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u Tx fake " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 489 | "BVC RESET ACK of BVCI=0\n", nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 490 | return bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 491 | nsei, 0, ns_bvci); |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 492 | } |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 493 | from_peer = gbproxy_peer_by_bvci(cfg, bvci); |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 494 | if (!from_peer) { |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 495 | /* if a PTP-BVC is reset, and we don't know that |
| 496 | * PTP-BVCI yet, we should allocate a new peer */ |
| 497 | LOGP(DGPRS, LOGL_INFO, "Allocationg new peer for " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 498 | "BVCI=%u via NSEI=%u\n", bvci, nsei); |
Holger Hans Peter Freyther | 0196c99 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 499 | from_peer = gbproxy_peer_alloc(cfg, bvci); |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 500 | from_peer->nsei = nsei; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 501 | } |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 502 | |
| 503 | if (!check_peer_nsei(from_peer, nsei)) |
| 504 | from_peer->nsei = nsei; |
| 505 | |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 506 | if (TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID)) { |
| 507 | struct gprs_ra_id raid; |
| 508 | /* We have a Cell Identifier present in this |
| 509 | * PDU, this means we can extend our local |
| 510 | * state information about this particular cell |
| 511 | * */ |
| 512 | memcpy(from_peer->ra, |
| 513 | TLVP_VAL(&tp, BSSGP_IE_CELL_ID), |
| 514 | sizeof(from_peer->ra)); |
| 515 | gsm48_parse_ra(&raid, from_peer->ra); |
| 516 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u/BVCI=%u " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 517 | "Cell ID %u-%u-%u-%u\n", nsei, |
Harald Welte | 1174c08 | 2010-05-12 00:07:29 +0200 | [diff] [blame] | 518 | bvci, raid.mcc, raid.mnc, raid.lac, |
| 519 | raid.rac); |
| 520 | } |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 521 | } |
| 522 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 523 | } |
| 524 | |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 525 | /* Normally, we can simply pass on all signalling messages from BSS to |
| 526 | * SGSN */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 527 | return gbprox_relay2sgsn(cfg, msg, from_peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 528 | err_no_peer: |
Jacob Erlbeck | c5085f9 | 2013-10-18 13:04:48 +0200 | [diff] [blame] | 529 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) cannot find peer based on NSEI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 530 | nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 531 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 532 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 533 | err_mand_ie: |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 534 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(BSS) missing mandatory RA IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 535 | nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 536 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 537 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 538 | } |
| 539 | |
| 540 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 541 | static int gbprox_rx_paging(struct gbproxy_config *cfg, struct msgb *msg, struct tlv_parsed *tp, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 542 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 543 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 544 | struct gbproxy_peer *peer = NULL; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 545 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 546 | |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 547 | LOGP(DGPRS, LOGL_INFO, "NSEI=%u(SGSN) BSSGP PAGING ", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 548 | nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 549 | if (TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 550 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 551 | LOGPC(DGPRS, LOGL_INFO, "routing by BVCI to peer BVCI=%u\n", |
| 552 | bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 553 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 554 | } else if (TLVP_PRESENT(tp, BSSGP_IE_ROUTEING_AREA)) { |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 555 | peer = gbproxy_peer_by_rai(cfg, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 556 | LOGPC(DGPRS, LOGL_INFO, "routing by RAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 62eaf54 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 557 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 558 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 559 | } else if (TLVP_PRESENT(tp, BSSGP_IE_LOCATION_AREA)) { |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 560 | peer = gbproxy_peer_by_lai(cfg, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA)); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 561 | LOGPC(DGPRS, LOGL_INFO, "routing by LAI to peer BVCI=%u\n", |
Holger Hans Peter Freyther | 62eaf54 | 2010-06-08 16:30:24 +0800 | [diff] [blame] | 562 | peer ? peer->bvci : -1); |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 563 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 564 | } else |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 565 | LOGPC(DGPRS, LOGL_INFO, "\n"); |
| 566 | |
| 567 | if (!peer) { |
| 568 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) BSSGP PAGING: " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 569 | "unable to route, missing IE\n", nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 570 | rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 571 | return -EINVAL; |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 572 | } |
| 573 | return gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 574 | } |
| 575 | |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 576 | /* Receive an incoming BVC-RESET message from the SGSN */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 577 | static int rx_reset_from_sgsn(struct gbproxy_config *cfg, |
| 578 | struct msgb *msg, struct tlv_parsed *tp, |
| 579 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 580 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 581 | struct gbproxy_peer *peer; |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 582 | uint16_t ptp_bvci; |
| 583 | |
| 584 | if (!TLVP_PRESENT(tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 585 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 586 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 587 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
| 588 | NULL, msg); |
| 589 | } |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 590 | ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 591 | |
| 592 | if (ptp_bvci >= 2) { |
| 593 | /* A reset for a PTP BVC was received, forward it to its |
| 594 | * respective peer */ |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 595 | peer = gbproxy_peer_by_bvci(cfg, ptp_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 596 | if (!peer) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 597 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u BVCI=%u: Cannot find BSS\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 598 | nsei, ptp_bvci); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 599 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 600 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 601 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 602 | NULL, msg); |
| 603 | } |
| 604 | return gbprox_relay2peer(msg, peer, ns_bvci); |
| 605 | } |
| 606 | |
| 607 | /* A reset for the Signalling entity has been received |
| 608 | * from the SGSN. As the signalling BVCI is shared |
| 609 | * among all the BSS's that we multiplex, it needs to |
| 610 | * be relayed */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 611 | llist_for_each_entry(peer, &cfg->bts_peers, list) |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 612 | gbprox_relay2peer(msg, peer, ns_bvci); |
| 613 | |
| 614 | return 0; |
| 615 | } |
| 616 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 617 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 618 | static int gbprox_rx_sig_from_sgsn(struct gbproxy_config *cfg, |
| 619 | struct msgb *msg, uint32_t nsei, |
| 620 | uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 621 | { |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 622 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 623 | struct tlv_parsed tp; |
| 624 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 625 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 626 | struct gbproxy_peer *peer; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 627 | uint16_t bvci; |
| 628 | int rc = 0; |
| 629 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 630 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 631 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BVCI=%u is not " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 632 | "signalling\n", nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 633 | /* FIXME: Send proper error message */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 634 | return -EINVAL; |
| 635 | } |
| 636 | |
| 637 | /* we actually should never see those two for BVCI == 0, but double-check |
| 638 | * just to make sure */ |
| 639 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 640 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 641 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 642 | "signalling\n", nsei); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 643 | return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 644 | } |
| 645 | |
| 646 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 647 | |
| 648 | switch (pdu_type) { |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 649 | case BSSGP_PDUT_BVC_RESET: |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 650 | rc = rx_reset_from_sgsn(cfg, msg, &tp, nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 651 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 652 | case BSSGP_PDUT_FLUSH_LL: |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 653 | case BSSGP_PDUT_BVC_RESET_ACK: |
| 654 | /* simple case: BVCI IE is mandatory */ |
| 655 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 656 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 657 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 658 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 659 | break; |
| 660 | case BSSGP_PDUT_PAGING_PS: |
| 661 | case BSSGP_PDUT_PAGING_CS: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 662 | /* process the paging request (LAI/RAI lookup) */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 663 | rc = gbprox_rx_paging(cfg, msg, &tp, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 664 | break; |
| 665 | case BSSGP_PDUT_STATUS: |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 666 | /* Some exception has occurred */ |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 667 | LOGP(DGPRS, LOGL_NOTICE, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 668 | "NSEI=%u(SGSN) BSSGP STATUS ", nsei); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 669 | if (!TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) { |
| 670 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| 671 | goto err_mand_ie; |
| 672 | } |
| 673 | LOGPC(DGPRS, LOGL_NOTICE, |
| 674 | "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
| 675 | bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
| 676 | if (TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 677 | uint16_t bvci = tlvp_val16_unal(&tp, BSSGP_IE_BVCI); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 678 | LOGPC(DGPRS, LOGL_NOTICE, |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 679 | "BVCI=%u\n", ntohs(bvci)); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 680 | } else |
| 681 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 682 | break; |
| 683 | /* those only exist in the SGSN -> BSS direction */ |
| 684 | case BSSGP_PDUT_SUSPEND_ACK: |
| 685 | case BSSGP_PDUT_SUSPEND_NACK: |
| 686 | case BSSGP_PDUT_RESUME_ACK: |
| 687 | case BSSGP_PDUT_RESUME_NACK: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 688 | /* RAI IE is mandatory */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 689 | if (!TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 690 | goto err_mand_ie; |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 691 | peer = gbproxy_peer_by_rai(cfg, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 692 | if (!peer) |
| 693 | goto err_no_peer; |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 694 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 695 | break; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 696 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 697 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 698 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 699 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 700 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 701 | if (bvci == 0) { |
| 702 | LOGP(DGPRS, LOGL_NOTICE, "NSEI=%u(SGSN) BSSGP " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 703 | "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 704 | pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
| 705 | /* should we send STATUS ? */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 706 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 707 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 708 | } else { |
| 709 | /* Mark BVC as (un)blocked */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 710 | block_unblock_peer(cfg, bvci, pdu_type); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 711 | } |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 712 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 713 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 714 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 715 | LOGP(DGPRS, LOGL_ERROR, |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 716 | "NSEI=%u(SGSN) BSSGP INVOKE TRACE not supported\n",nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 717 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 718 | ctr[GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 719 | rc = bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_FEAT, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 720 | break; |
| 721 | default: |
Harald Welte | 72953b8 | 2010-05-12 00:20:41 +0200 | [diff] [blame] | 722 | LOGP(DGPRS, LOGL_NOTICE, "BSSGP PDU type 0x%02x unknown\n", |
| 723 | pdu_type); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 724 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 725 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 726 | rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 727 | break; |
| 728 | } |
| 729 | |
| 730 | return rc; |
| 731 | err_mand_ie: |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 732 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) missing mandatory IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 733 | nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 734 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 735 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 736 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 737 | err_no_peer: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 738 | LOGP(DGPRS, LOGL_ERROR, "NSEI=%u(SGSN) cannot find peer based on RAI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 739 | nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 740 | rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 741 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 742 | } |
| 743 | |
| 744 | /* Main input function for Gb proxy */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 745 | int gbprox_rcvmsg(struct gbproxy_config *cfg, struct msgb *msg, uint16_t nsei, |
| 746 | uint16_t ns_bvci, uint16_t nsvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 747 | { |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 748 | int rc; |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 749 | struct gbproxy_peer *peer; |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 750 | int remote_end_is_sgsn = nsei == cfg->nsip_sgsn_nsei; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 751 | |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 752 | if (remote_end_is_sgsn) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 753 | gbprox_process_bssgp_dl(cfg, msg, NULL); |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 754 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 755 | /* Only BVCI=0 messages need special treatment */ |
| 756 | if (ns_bvci == 0 || ns_bvci == 1) { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 757 | if (remote_end_is_sgsn) |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 758 | rc = gbprox_rx_sig_from_sgsn(cfg, msg, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 759 | else |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 760 | rc = gbprox_rx_sig_from_bss(cfg, msg, nsei, ns_bvci); |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 761 | } else { |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 762 | peer = gbproxy_peer_by_bvci(cfg, ns_bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 763 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 764 | /* All other BVCI are PTP and thus can be simply forwarded */ |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 765 | if (!remote_end_is_sgsn) { |
| 766 | if (peer) |
| 767 | check_peer_nsei(peer, nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 768 | return gbprox_relay2sgsn(cfg, msg, peer, ns_bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 769 | } |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 770 | |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 771 | /* else: SGSN -> BSS direction */ |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 772 | if (!peer) { |
Jacob Erlbeck | f0f63a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 773 | LOGP(DGPRS, LOGL_INFO, "Didn't find peer for " |
| 774 | "BVCI=%u for message from NSVC=%u/NSEI=%u (SGSN)\n", |
| 775 | ns_bvci, nsvci, nsei); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 776 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | f0f63a4 | 2013-10-18 22:12:17 +0200 | [diff] [blame] | 777 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| 778 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 779 | &ns_bvci, msg); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 780 | } |
| 781 | if (peer->blocked) { |
| 782 | LOGP(DGPRS, LOGL_NOTICE, "Dropping PDU for " |
| 783 | "blocked BVCI=%u via NSVC=%u/NSEI=%u\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 784 | ns_bvci, nsvci, nsei); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 785 | rate_ctr_inc(&peer->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 786 | return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, NULL, msg); |
| 787 | } |
| 788 | rc = gbprox_relay2peer(msg, peer, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 789 | } |
| 790 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 791 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 792 | } |
Harald Welte | 85801d0 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 793 | |
Harald Welte | 1ccbf44 | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 794 | int gbprox_reset_persistent_nsvcs(struct gprs_ns_inst *nsi) |
| 795 | { |
| 796 | struct gprs_nsvc *nsvc; |
| 797 | |
| 798 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 799 | if (!nsvc->persistent) |
| 800 | continue; |
| 801 | gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| 802 | } |
| 803 | return 0; |
| 804 | } |
| 805 | |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 806 | /* Signal handler for signals from NS layer */ |
| 807 | int gbprox_signal(unsigned int subsys, unsigned int signal, |
| 808 | void *handler_data, void *signal_data) |
| 809 | { |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 810 | struct gbproxy_config *cfg = handler_data; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 811 | struct ns_signal_data *nssd = signal_data; |
| 812 | struct gprs_nsvc *nsvc = nssd->nsvc; |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 813 | struct gbproxy_peer *peer; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 814 | |
Harald Welte | a6a20b4 | 2012-06-16 16:40:42 +0800 | [diff] [blame] | 815 | if (subsys != SS_L_NS) |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 816 | return 0; |
| 817 | |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 818 | if (signal == S_NS_RESET && nsvc->nsei == cfg->nsip_sgsn_nsei) { |
Harald Welte | f69c059 | 2010-05-11 18:29:44 +0200 | [diff] [blame] | 819 | /* We have received a NS-RESET from the NSEI and NSVC |
| 820 | * of the SGSN. This might happen with SGSN that start |
| 821 | * their own NS-RESET procedure without waiting for our |
| 822 | * NS-RESET */ |
| 823 | nsvc->remote_end_is_sgsn = 1; |
| 824 | } |
| 825 | |
Harald Welte | b778d2c | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 826 | if (signal == S_NS_ALIVE_EXP && nsvc->remote_end_is_sgsn) { |
| 827 | LOGP(DGPRS, LOGL_NOTICE, "Tns alive expired too often, " |
| 828 | "re-starting RESET procedure\n"); |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 829 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 830 | ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
Harald Welte | e6599ee | 2012-06-17 12:25:53 +0800 | [diff] [blame] | 831 | gprs_ns_nsip_connect(nsvc->nsi, &nsvc->ip.bts_addr, |
| 832 | nsvc->nsei, nsvc->nsvci); |
Harald Welte | b778d2c | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 833 | } |
| 834 | |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 835 | if (!nsvc->remote_end_is_sgsn) { |
| 836 | /* from BSS to SGSN */ |
Jacob Erlbeck | 5f1faa3 | 2014-08-21 10:01:30 +0200 | [diff] [blame] | 837 | peer = gbproxy_peer_by_nsei(cfg, nsvc->nsei); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 838 | if (!peer) { |
| 839 | LOGP(DGPRS, LOGL_NOTICE, "signal %u for unknown peer " |
| 840 | "NSEI=%u/NSVCI=%u\n", signal, nsvc->nsei, |
| 841 | nsvc->nsvci); |
| 842 | return 0; |
| 843 | } |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 844 | switch (signal) { |
| 845 | case S_NS_RESET: |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 846 | case S_NS_BLOCK: |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 847 | if (!peer->blocked) |
| 848 | break; |
| 849 | LOGP(DGPRS, LOGL_NOTICE, "Converting NS_RESET from " |
| 850 | "NSEI=%u/NSVCI=%u into BSSGP_BVC_BLOCK to SGSN\n", |
| 851 | nsvc->nsei, nsvc->nsvci); |
| 852 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, |
| 853 | peer->bvci, 0); |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 854 | break; |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 855 | } |
| 856 | } else { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 857 | /* Forward this message to all NS-VC to BSS */ |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 858 | struct gprs_ns_inst *nsi = cfg->nsi; |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 859 | struct gprs_nsvc *next_nsvc; |
| 860 | |
| 861 | llist_for_each_entry(next_nsvc, &nsi->gprs_nsvcs, list) { |
| 862 | if (next_nsvc->remote_end_is_sgsn) |
| 863 | continue; |
| 864 | |
| 865 | /* Note that the following does not start the full |
| 866 | * procedures including timer based retransmissions. */ |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 867 | switch (signal) { |
| 868 | case S_NS_RESET: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 869 | gprs_ns_tx_reset(next_nsvc, nssd->cause); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 870 | break; |
| 871 | case S_NS_BLOCK: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 872 | gprs_ns_tx_block(next_nsvc, nssd->cause); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 873 | break; |
| 874 | case S_NS_UNBLOCK: |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 875 | gprs_ns_tx_unblock(next_nsvc); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 876 | break; |
| 877 | } |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 878 | } |
| 879 | } |
| 880 | return 0; |
| 881 | } |
| 882 | |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 883 | void gbprox_reset(struct gbproxy_config *cfg) |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 884 | { |
Holger Hans Peter Freyther | 1ddd9e5 | 2014-08-04 11:35:32 +0200 | [diff] [blame] | 885 | struct gbproxy_peer *peer, *tmp; |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 886 | |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 887 | llist_for_each_entry_safe(peer, tmp, &cfg->bts_peers, list) |
Holger Hans Peter Freyther | 0196c99 | 2014-08-04 17:10:08 +0200 | [diff] [blame] | 888 | gbproxy_peer_free(peer); |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 889 | |
Holger Hans Peter Freyther | eece6277 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 890 | rate_ctr_group_free(cfg->ctrg); |
| 891 | gbproxy_init_config(cfg); |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 892 | } |
| 893 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 894 | int gbproxy_init_config(struct gbproxy_config *cfg) |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 895 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 896 | struct timespec tp; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 897 | INIT_LLIST_HEAD(&cfg->bts_peers); |
Holger Hans Peter Freyther | a7027a0 | 2014-08-04 11:19:56 +0200 | [diff] [blame] | 898 | cfg->ctrg = rate_ctr_group_alloc(tall_bsc_ctx, &global_ctrg_desc, 0); |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 899 | clock_gettime(CLOCK_REALTIME, &tp); |
| 900 | cfg->bss_ptmsi_state = tp.tv_sec + tp.tv_nsec; |
| 901 | cfg->sgsn_tlli_state = tp.tv_sec - tp.tv_nsec; |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 902 | return 0; |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 903 | } |