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 | |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 34 | #include <osmocom/core/hashtable.h> |
Daniel Willmann | e8c8ec9 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 35 | #include <osmocom/core/logging.h> |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 36 | #include <osmocom/core/talloc.h> |
| 37 | #include <osmocom/core/select.h> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 38 | #include <osmocom/core/rate_ctr.h> |
Jacob Erlbeck | 46caed8 | 2015-11-02 15:15:38 +0100 | [diff] [blame] | 39 | #include <osmocom/core/stats.h> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 40 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 41 | #include <osmocom/gprs/gprs_ns2.h> |
Harald Welte | ea34a4e | 2012-06-16 14:59:56 +0800 | [diff] [blame] | 42 | #include <osmocom/gprs/gprs_bssgp.h> |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 43 | #include <osmocom/gprs/gprs_bssgp_bss.h> |
Harald Welte | ea34a4e | 2012-06-16 14:59:56 +0800 | [diff] [blame] | 44 | |
Jacob Erlbeck | 7c101d9 | 2014-06-06 18:49:23 +0200 | [diff] [blame] | 45 | #include <osmocom/gsm/gsm_utils.h> |
| 46 | |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 47 | #include <osmocom/sgsn/signal.h> |
| 48 | #include <osmocom/sgsn/debug.h> |
| 49 | #include <osmocom/sgsn/gprs_gb_parse.h> |
| 50 | #include <osmocom/sgsn/gb_proxy.h> |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 51 | |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 52 | #include <osmocom/sgsn/gprs_llc.h> |
Harald Welte | 53373bc | 2016-04-20 17:11:43 +0200 | [diff] [blame] | 53 | #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 54 | #include <osmocom/sgsn/gprs_utils.h> |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 55 | |
Pau Espin Pedrol | b1d1c24 | 2018-10-30 17:27:59 +0100 | [diff] [blame] | 56 | extern void *tall_sgsn_ctx; |
Neels Hofmeyr | ee6cfdc | 2017-07-13 02:03:50 +0200 | [diff] [blame] | 57 | |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 58 | static const struct rate_ctr_desc global_ctr_description[] = { |
| 59 | { "inv-bvci", "Invalid BVC Identifier " }, |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 60 | { "inv-lai", "Invalid Location Area Identifier" }, |
| 61 | { "inv-rai", "Invalid Routing Area Identifier " }, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 62 | { "inv-nsei", "No BVC established for NSEI " }, |
Pau Espin Pedrol | 437e209 | 2018-07-24 12:41:26 +0200 | [diff] [blame] | 63 | { "proto-err:bss", "BSSGP protocol error (BSS )" }, |
| 64 | { "proto-err:sgsn", "BSSGP protocol error (SGSN)" }, |
| 65 | { "not-supp:bss", "Feature not supported (BSS )" }, |
| 66 | { "not-supp:sgsn", "Feature not supported (SGSN)" }, |
| 67 | { "restart:sgsn", "Restarted RESET procedure (SGSN)" }, |
| 68 | { "tx-err:sgsn", "NS Transmission error (SGSN)" }, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 69 | { "error", "Other error " }, |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 70 | { "mod-peer-err", "Patch error: no peer " }, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 71 | }; |
| 72 | |
| 73 | static const struct rate_ctr_group_desc global_ctrg_desc = { |
Max | 8a01a80 | 2017-12-20 13:10:11 +0100 | [diff] [blame] | 74 | .group_name_prefix = "gbproxy:global", |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 75 | .group_description = "GBProxy Global Statistics", |
| 76 | .num_ctr = ARRAY_SIZE(global_ctr_description), |
| 77 | .ctr_desc = global_ctr_description, |
Jacob Erlbeck | 46caed8 | 2015-11-02 15:15:38 +0100 | [diff] [blame] | 78 | .class_id = OSMO_STATS_CLASS_GLOBAL, |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 79 | }; |
| 80 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 81 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_bvc *bvc, |
Daniel Willmann | 8bca8de | 2020-11-03 21:11:45 +0100 | [diff] [blame] | 82 | uint16_t ns_bvci); |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 83 | static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 84 | uint16_t ns_bvci, uint16_t sgsn_nsei); |
Jacob Erlbeck | d211d1d | 2014-09-22 13:30:46 +0200 | [diff] [blame] | 85 | static void gbproxy_reset_imsi_acquisition(struct gbproxy_link_info* link_info); |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 86 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 87 | static int check_bvc_nsei(struct gbproxy_bvc *bvc, uint16_t nsei) |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 88 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 89 | OSMO_ASSERT(bvc); |
| 90 | OSMO_ASSERT(bvc->nse); |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 91 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 92 | if (bvc->nse->nsei != nsei) { |
| 93 | LOGPBVC(bvc, LOGL_NOTICE, "Peer entry doesn't match current NSEI " |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 94 | "via NSE(%05u/BSS)\n", nsei); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 95 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_INV_NSEI]); |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 96 | return 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 97 | } |
| 98 | |
Jacob Erlbeck | 64cb924 | 2013-10-24 12:48:56 +0200 | [diff] [blame] | 99 | return 1; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 100 | } |
| 101 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 102 | /* strip off the NS header */ |
| 103 | static void strip_ns_hdr(struct msgb *msg) |
| 104 | { |
| 105 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 106 | msgb_pull(msg, strip_len); |
| 107 | } |
| 108 | |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 109 | /* Transmit Chapter 9.2.10 Identity Request */ |
| 110 | static void gprs_put_identity_req(struct msgb *msg, uint8_t id_type) |
| 111 | { |
| 112 | struct gsm48_hdr *gh; |
| 113 | |
| 114 | id_type &= GSM_MI_TYPE_MASK; |
| 115 | |
| 116 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 117 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 118 | gh->msg_type = GSM48_MT_GMM_ID_REQ; |
| 119 | gh->data[0] = id_type; |
| 120 | } |
| 121 | |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 122 | /* Transmit Chapter 9.4.6.2 Detach Accept (mobile originated detach) */ |
| 123 | static void gprs_put_mo_detach_acc(struct msgb *msg) |
| 124 | { |
| 125 | struct gsm48_hdr *gh; |
| 126 | |
| 127 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 128 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 129 | gh->msg_type = GSM48_MT_GMM_DETACH_ACK; |
| 130 | gh->data[0] = 0; /* no force to standby */ |
| 131 | } |
| 132 | |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 133 | static void gprs_push_llc_ui(struct msgb *msg, |
| 134 | int is_uplink, unsigned sapi, unsigned nu) |
| 135 | { |
| 136 | const uint8_t e_bit = 0; |
| 137 | const uint8_t pm_bit = 1; |
| 138 | const uint8_t cr_bit = is_uplink ? 0 : 1; |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 139 | uint8_t *llc; |
| 140 | uint8_t *fcs_field; |
| 141 | uint32_t fcs; |
| 142 | |
| 143 | nu &= 0x01ff; /* 9 Bit */ |
| 144 | |
| 145 | llc = msgb_push(msg, 3); |
| 146 | llc[0] = (cr_bit << 6) | (sapi & 0x0f); |
| 147 | llc[1] = 0xc0 | (nu >> 6); /* UI frame */ |
| 148 | llc[2] = (nu << 2) | ((e_bit & 1) << 1) | (pm_bit & 1); |
| 149 | |
| 150 | fcs = gprs_llc_fcs(llc, msgb_length(msg)); |
| 151 | fcs_field = msgb_put(msg, 3); |
| 152 | fcs_field[0] = (uint8_t)(fcs >> 0); |
| 153 | fcs_field[1] = (uint8_t)(fcs >> 8); |
| 154 | fcs_field[2] = (uint8_t)(fcs >> 16); |
| 155 | } |
| 156 | |
| 157 | static void gprs_push_bssgp_dl_unitdata(struct msgb *msg, |
| 158 | uint32_t tlli) |
| 159 | { |
| 160 | struct bssgp_ud_hdr *budh; |
| 161 | uint8_t *llc = msgb_data(msg); |
| 162 | size_t llc_size = msgb_length(msg); |
| 163 | const size_t llc_ie_hdr_size = 3; |
| 164 | const uint8_t qos_profile[] = {0x00, 0x50, 0x20}; /* hard-coded */ |
| 165 | const uint8_t lifetime[] = {0x02, 0x58}; /* 6s hard-coded */ |
| 166 | |
| 167 | const size_t bssgp_overhead = sizeof(*budh) + |
| 168 | TVLV_GROSS_LEN(sizeof(lifetime)) + llc_ie_hdr_size; |
| 169 | uint8_t *ie; |
| 170 | uint32_t tlli_be = htonl(tlli); |
| 171 | |
| 172 | budh = (struct bssgp_ud_hdr *)msgb_push(msg, bssgp_overhead); |
| 173 | |
| 174 | budh->pdu_type = BSSGP_PDUT_DL_UNITDATA; |
| 175 | memcpy(&budh->tlli, &tlli_be, sizeof(budh->tlli)); |
| 176 | memcpy(&budh->qos_profile, qos_profile, sizeof(budh->qos_profile)); |
| 177 | |
| 178 | ie = budh->data; |
| 179 | tvlv_put(ie, BSSGP_IE_PDU_LIFETIME, sizeof(lifetime), lifetime); |
| 180 | ie += TVLV_GROSS_LEN(sizeof(lifetime)); |
| 181 | |
| 182 | /* Note: Add alignment before the LLC IE if inserting other IE */ |
| 183 | |
| 184 | *(ie++) = BSSGP_IE_LLC_PDU; |
| 185 | *(ie++) = llc_size / 256; |
| 186 | *(ie++) = llc_size % 256; |
| 187 | |
| 188 | OSMO_ASSERT(ie == llc); |
| 189 | |
| 190 | msgb_bssgph(msg) = (uint8_t *)budh; |
| 191 | msgb_tlli(msg) = tlli; |
| 192 | } |
| 193 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 194 | /* update bvc according to the BSS message */ |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 195 | static void gbprox_update_current_raid(uint8_t *raid_enc, |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 196 | struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 197 | const char *log_text) |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 198 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 199 | struct gbproxy_patch_state *state = &bvc->patch_state; |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 200 | const struct osmo_plmn_id old_plmn = state->local_plmn; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 201 | struct gprs_ra_id raid; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 202 | OSMO_ASSERT(bvc->nse); |
| 203 | struct gbproxy_config *cfg = bvc->nse->cfg; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 204 | OSMO_ASSERT(cfg); |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 205 | |
| 206 | if (!raid_enc) |
| 207 | return; |
| 208 | |
| 209 | gsm48_parse_ra(&raid, raid_enc); |
| 210 | |
| 211 | /* save source side MCC/MNC */ |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 212 | if (!cfg->core_plmn.mcc || raid.mcc == cfg->core_plmn.mcc) { |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 213 | state->local_plmn.mcc = 0; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 214 | } else { |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 215 | state->local_plmn.mcc = raid.mcc; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 216 | } |
| 217 | |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 218 | if (!cfg->core_plmn.mnc |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 219 | || !osmo_mnc_cmp(raid.mnc, raid.mnc_3_digits, |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 220 | cfg->core_plmn.mnc, cfg->core_plmn.mnc_3_digits)) { |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 221 | state->local_plmn.mnc = 0; |
| 222 | state->local_plmn.mnc_3_digits = false; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 223 | } else { |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 224 | state->local_plmn.mnc = raid.mnc; |
| 225 | state->local_plmn.mnc_3_digits = raid.mnc_3_digits; |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 226 | } |
| 227 | |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 228 | if (osmo_plmn_cmp(&old_plmn, &state->local_plmn)) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 229 | LOGPBVC(bvc, LOGL_NOTICE, |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 230 | "Patching RAID %sactivated, msg: %s, " |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 231 | "local: %s, core: %s\n", |
| 232 | state->local_plmn.mcc || state->local_plmn.mnc ? |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 233 | "" : "de", |
| 234 | log_text, |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 235 | osmo_plmn_name(&state->local_plmn), |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 236 | osmo_plmn_name2(&cfg->core_plmn)); |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 237 | } |
| 238 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 239 | uint32_t gbproxy_make_bss_ptmsi(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 240 | uint32_t sgsn_ptmsi) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 241 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 242 | uint32_t bss_ptmsi; |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 243 | int max_retries = 23, rc = 0; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 244 | if (!bvc->nse->cfg->patch_ptmsi) { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 245 | bss_ptmsi = sgsn_ptmsi; |
| 246 | } else { |
| 247 | do { |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 248 | rc = osmo_get_rand_id((uint8_t *) &bss_ptmsi, sizeof(bss_ptmsi)); |
| 249 | if (rc < 0) { |
Daniel Willmann | 537d480 | 2015-10-12 19:36:35 +0200 | [diff] [blame] | 250 | bss_ptmsi = GSM_RESERVED_TMSI; |
| 251 | break; |
| 252 | } |
| 253 | |
Eric Wild | df9b391 | 2019-06-17 12:13:28 +0200 | [diff] [blame] | 254 | bss_ptmsi = bss_ptmsi | GSM23003_TMSI_SGSN_MASK; |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 255 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 256 | if (gbproxy_link_info_by_ptmsi(bvc, bss_ptmsi)) |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 257 | bss_ptmsi = GSM_RESERVED_TMSI; |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 258 | } while (bss_ptmsi == GSM_RESERVED_TMSI && max_retries--); |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 259 | } |
| 260 | |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 261 | if (bss_ptmsi == GSM_RESERVED_TMSI) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 262 | LOGPBVC(bvc, LOGL_ERROR, "Failed to allocate a BSS P-TMSI: %d (%s)\n", rc, strerror(-rc)); |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 263 | |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 264 | return bss_ptmsi; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 265 | } |
| 266 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 267 | uint32_t gbproxy_make_sgsn_tlli(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 268 | struct gbproxy_link_info *link_info, |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 269 | uint32_t bss_tlli) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 270 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 271 | uint32_t sgsn_tlli; |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 272 | int max_retries = 23, rc = 0; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 273 | if (!bvc->nse->cfg->patch_ptmsi) { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 274 | sgsn_tlli = bss_tlli; |
Jacob Erlbeck | 4110868 | 2014-10-31 10:47:29 +0100 | [diff] [blame] | 275 | } else if (link_info->sgsn_tlli.ptmsi != GSM_RESERVED_TMSI && |
| 276 | gprs_tlli_type(bss_tlli) == TLLI_FOREIGN) { |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 277 | sgsn_tlli = gprs_tmsi2tlli(link_info->sgsn_tlli.ptmsi, |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 278 | TLLI_FOREIGN); |
Jacob Erlbeck | 4110868 | 2014-10-31 10:47:29 +0100 | [diff] [blame] | 279 | } else if (link_info->sgsn_tlli.ptmsi != GSM_RESERVED_TMSI && |
| 280 | gprs_tlli_type(bss_tlli) == TLLI_LOCAL) { |
| 281 | sgsn_tlli = gprs_tmsi2tlli(link_info->sgsn_tlli.ptmsi, |
| 282 | TLLI_LOCAL); |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 283 | } else { |
| 284 | do { |
| 285 | /* create random TLLI, 0b01111xxx... */ |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 286 | rc = osmo_get_rand_id((uint8_t *) &sgsn_tlli, sizeof(sgsn_tlli)); |
| 287 | if (rc < 0) { |
Daniel Willmann | 537d480 | 2015-10-12 19:36:35 +0200 | [diff] [blame] | 288 | sgsn_tlli = 0; |
| 289 | break; |
| 290 | } |
| 291 | |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 292 | sgsn_tlli = (sgsn_tlli & 0x7fffffff) | 0x78000000; |
| 293 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 294 | if (gbproxy_link_info_by_any_sgsn_tlli(bvc, sgsn_tlli)) |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 295 | sgsn_tlli = 0; |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 296 | } while (!sgsn_tlli && max_retries--); |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 297 | } |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 298 | |
| 299 | if (!sgsn_tlli) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 300 | LOGPBVC(bvc, LOGL_ERROR, "Failed to allocate an SGSN TLLI: %d (%s)\n", rc, strerror(-rc)); |
Jacob Erlbeck | 08fbeb8 | 2014-09-19 09:28:42 +0200 | [diff] [blame] | 301 | |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 302 | return sgsn_tlli; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 303 | } |
| 304 | |
Jacob Erlbeck | d211d1d | 2014-09-22 13:30:46 +0200 | [diff] [blame] | 305 | void gbproxy_reset_link(struct gbproxy_link_info *link_info) |
| 306 | { |
| 307 | gbproxy_reset_imsi_acquisition(link_info); |
| 308 | } |
| 309 | |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 310 | /* Returns != 0 iff IMSI acquisition was in progress */ |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 311 | static int gbproxy_restart_imsi_acquisition(struct gbproxy_link_info* link_info) |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 312 | { |
| 313 | int in_progress = 0; |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 314 | if (!link_info) |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 315 | return 0; |
| 316 | |
Jacob Erlbeck | 6575028 | 2014-09-22 15:41:21 +0200 | [diff] [blame] | 317 | if (link_info->imsi_acq_pending) |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 318 | in_progress = 1; |
| 319 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 320 | gbproxy_link_info_discard_messages(link_info); |
Harald Welte | aed46ec | 2019-03-22 09:44:42 +0100 | [diff] [blame] | 321 | link_info->imsi_acq_pending = false; |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 322 | |
| 323 | return in_progress; |
| 324 | } |
| 325 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 326 | static void gbproxy_reset_imsi_acquisition(struct gbproxy_link_info* link_info) |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 327 | { |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 328 | gbproxy_restart_imsi_acquisition(link_info); |
Jacob Erlbeck | 6575028 | 2014-09-22 15:41:21 +0200 | [diff] [blame] | 329 | link_info->vu_gen_tx_bss = GBPROXY_INIT_VU_GEN_TX; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 330 | } |
| 331 | |
Pau Espin Pedrol | e759f33 | 2018-11-22 17:53:41 +0100 | [diff] [blame] | 332 | /* Got identity response with IMSI, assuming the request had |
| 333 | * been generated by the gbproxy */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 334 | static int gbproxy_flush_stored_messages(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 335 | time_t now, |
Pau Espin Pedrol | b0b1e3c | 2018-11-22 17:41:16 +0100 | [diff] [blame] | 336 | struct gbproxy_link_info* link_info) |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 337 | { |
| 338 | int rc; |
| 339 | struct msgb *stored_msg; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 340 | OSMO_ASSERT(bvc); |
| 341 | OSMO_ASSERT(bvc->nse); |
| 342 | struct gbproxy_config *cfg = bvc->nse->cfg; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 343 | OSMO_ASSERT(cfg); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 344 | |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 345 | /* Patch and flush stored messages towards the SGSN */ |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 346 | while ((stored_msg = msgb_dequeue_count(&link_info->stored_msgs, |
| 347 | &link_info->stored_msgs_len))) { |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 348 | struct gprs_gb_parse_context tmp_parse_ctx = {0}; |
| 349 | tmp_parse_ctx.to_bss = 0; |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 350 | tmp_parse_ctx.peer_nsei = msgb_nsei(stored_msg); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 351 | int len_change = 0; |
| 352 | |
| 353 | gprs_gb_parse_bssgp(msgb_bssgph(stored_msg), |
| 354 | msgb_bssgp_len(stored_msg), |
| 355 | &tmp_parse_ctx); |
Pau Espin Pedrol | 8b67202 | 2018-11-22 17:25:49 +0100 | [diff] [blame] | 356 | gbproxy_patch_bssgp(stored_msg, msgb_bssgph(stored_msg), |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 357 | msgb_bssgp_len(stored_msg), |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 358 | bvc, link_info, &len_change, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 359 | &tmp_parse_ctx); |
| 360 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 361 | rc = gbproxy_update_link_state_after(bvc, link_info, now, |
Daniel Willmann | beade31 | 2016-11-07 17:54:29 +0100 | [diff] [blame] | 362 | &tmp_parse_ctx); |
| 363 | if (rc == 1) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 364 | LOGPBVC_CAT(bvc, DLLC, LOGL_NOTICE, "link_info deleted while flushing stored messages\n"); |
Daniel Willmann | beade31 | 2016-11-07 17:54:29 +0100 | [diff] [blame] | 365 | msgb_free(stored_msg); |
| 366 | return -1; |
| 367 | } |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 368 | |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 369 | rc = gbprox_relay2sgsn(cfg, stored_msg, |
Pau Espin Pedrol | b540c3e | 2018-11-22 17:54:23 +0100 | [diff] [blame] | 370 | msgb_bvci(stored_msg), link_info->sgsn_nsei); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 371 | |
| 372 | if (rc < 0) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 373 | LOGPBVC_CAT(bvc, DLLC, LOGL_ERROR, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 374 | "failed to send stored message " |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 375 | "(%s)\n", |
Pau Espin Pedrol | b0b1e3c | 2018-11-22 17:41:16 +0100 | [diff] [blame] | 376 | tmp_parse_ctx.llc_msg_name ? |
| 377 | tmp_parse_ctx.llc_msg_name : "BSSGP"); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 378 | msgb_free(stored_msg); |
| 379 | } |
Daniel Willmann | beade31 | 2016-11-07 17:54:29 +0100 | [diff] [blame] | 380 | |
| 381 | return 0; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 382 | } |
| 383 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 384 | static int gbproxy_gsm48_to_bvc(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 6575028 | 2014-09-22 15:41:21 +0200 | [diff] [blame] | 385 | struct gbproxy_link_info* link_info, |
| 386 | uint16_t bvci, |
| 387 | struct msgb *msg /* Takes msg ownership */) |
| 388 | { |
| 389 | int rc; |
| 390 | |
| 391 | /* Workaround to avoid N(U) collisions and to enable a restart |
| 392 | * of the IMSI acquisition procedure. This will work unless the |
| 393 | * SGSN has an initial V(UT) within [256-32, 256+n_retries] |
| 394 | * (see GSM 04.64, 8.4.2). */ |
| 395 | gprs_push_llc_ui(msg, 0, GPRS_SAPI_GMM, link_info->vu_gen_tx_bss); |
| 396 | link_info->vu_gen_tx_bss = (link_info->vu_gen_tx_bss + 1) % 512; |
| 397 | |
| 398 | gprs_push_bssgp_dl_unitdata(msg, link_info->tlli.current); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 399 | msg->l3h = msg->data; |
| 400 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 401 | rc = gbprox_relay2peer(msg, bvc, bvci); |
Jacob Erlbeck | 6575028 | 2014-09-22 15:41:21 +0200 | [diff] [blame] | 402 | msgb_free(msg); |
| 403 | return rc; |
| 404 | } |
| 405 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 406 | static void gbproxy_acquire_imsi(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 407 | struct gbproxy_link_info* link_info, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 408 | uint16_t bvci) |
| 409 | { |
| 410 | struct msgb *idreq_msg; |
| 411 | |
| 412 | /* Send IDENT REQ */ |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 413 | idreq_msg = gsm48_msgb_alloc_name("GSM 04.08 ACQ IMSI"); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 414 | gprs_put_identity_req(idreq_msg, GSM_MI_TYPE_IMSI); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 415 | gbproxy_gsm48_to_bvc(bvc, link_info, bvci, idreq_msg); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 416 | } |
| 417 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 418 | static void gbproxy_tx_detach_acc(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 419 | struct gbproxy_link_info* link_info, |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 420 | uint16_t bvci) |
| 421 | { |
| 422 | struct msgb *detacc_msg; |
| 423 | |
| 424 | /* Send DETACH ACC */ |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 425 | detacc_msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACC"); |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 426 | gprs_put_mo_detach_acc(detacc_msg); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 427 | gbproxy_gsm48_to_bvc(bvc, link_info, bvci, detacc_msg); |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 428 | } |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 429 | |
| 430 | /* Return != 0 iff msg still needs to be processed */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 431 | static int gbproxy_imsi_acquisition(struct gbproxy_bvc *bvc, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 432 | struct msgb *msg, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 433 | time_t now, |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 434 | struct gbproxy_link_info* link_info, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 435 | struct gprs_gb_parse_context *parse_ctx) |
| 436 | { |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 437 | struct msgb *stored_msg; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 438 | OSMO_ASSERT(bvc); |
| 439 | OSMO_ASSERT(bvc->nse); |
| 440 | struct gbproxy_config *cfg = bvc->nse->cfg; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 441 | OSMO_ASSERT(cfg); |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 442 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 443 | if (!link_info) |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 444 | return 1; |
| 445 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 446 | if (!link_info->imsi_acq_pending && link_info->imsi_len > 0) |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 447 | return 1; |
| 448 | |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 449 | if (parse_ctx->g48_hdr) |
| 450 | switch (parse_ctx->g48_hdr->msg_type) |
| 451 | { |
Jacob Erlbeck | e27ab91 | 2014-09-18 10:08:27 +0200 | [diff] [blame] | 452 | case GSM48_MT_GMM_RA_UPD_REQ: |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 453 | case GSM48_MT_GMM_ATTACH_REQ: |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 454 | if (gbproxy_restart_imsi_acquisition(link_info)) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 455 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 456 | " IMSI acquisition was in progress " |
Jacob Erlbeck | e27ab91 | 2014-09-18 10:08:27 +0200 | [diff] [blame] | 457 | "when receiving an %s.\n", |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 458 | parse_ctx->llc_msg_name); |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 459 | } |
| 460 | break; |
| 461 | case GSM48_MT_GMM_DETACH_REQ: |
| 462 | /* Nothing has been sent to the SGSN yet */ |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 463 | if (link_info->imsi_acq_pending) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 464 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 465 | "IMSI acquisition was in progress " |
| 466 | "when receiving a DETACH_REQ.\n"); |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 467 | } |
| 468 | if (!parse_ctx->invalidate_tlli) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 469 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 470 | "IMSI not yet acquired, " |
| 471 | "faking a DETACH_ACC.\n"); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 472 | gbproxy_tx_detach_acc(bvc, link_info, msgb_bvci(msg)); |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 473 | parse_ctx->invalidate_tlli = 1; |
| 474 | } |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 475 | gbproxy_reset_imsi_acquisition(link_info); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 476 | gbproxy_update_link_state_after(bvc, link_info, now, |
Jacob Erlbeck | 2a5096d | 2014-09-12 12:12:31 +0200 | [diff] [blame] | 477 | parse_ctx); |
| 478 | return 0; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 479 | } |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 480 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 481 | if (link_info->imsi_acq_pending && link_info->imsi_len > 0) { |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 482 | int is_ident_resp = |
| 483 | parse_ctx->g48_hdr && |
Neels Hofmeyr | 531734a | 2016-03-14 16:13:24 +0100 | [diff] [blame] | 484 | gsm48_hdr_pdisc(parse_ctx->g48_hdr) == GSM48_PDISC_MM_GPRS && |
| 485 | gsm48_hdr_msg_type(parse_ctx->g48_hdr) == GSM48_MT_GMM_ID_RESP; |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 486 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 487 | LOGPBVC_CAT(bvc, DLLC, LOGL_DEBUG, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 488 | "IMSI acquisition succeeded, " |
| 489 | "flushing stored messages\n"); |
Daniel Willmann | beade31 | 2016-11-07 17:54:29 +0100 | [diff] [blame] | 490 | /* The IMSI is now available. If flushing the messages fails, |
| 491 | * then link_info has been deleted and we should return |
| 492 | * immediately. */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 493 | if (gbproxy_flush_stored_messages(bvc, now, link_info) < 0) |
Daniel Willmann | beade31 | 2016-11-07 17:54:29 +0100 | [diff] [blame] | 494 | return 0; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 495 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 496 | gbproxy_reset_imsi_acquisition(link_info); |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 497 | |
| 498 | /* This message is most probably the response to the ident |
| 499 | * request sent by gbproxy_acquire_imsi(). Don't forward it to |
| 500 | * the SGSN. */ |
| 501 | return !is_ident_resp; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 502 | } |
| 503 | |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 504 | /* The message cannot be processed since the IMSI is still missing */ |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 505 | |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 506 | /* If queue is getting too large, drop oldest msgb before adding new one */ |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 507 | if (cfg->stored_msgs_max_len > 0) { |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 508 | int exceeded_max_len = link_info->stored_msgs_len |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 509 | + 1 - cfg->stored_msgs_max_len; |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 510 | |
| 511 | for (; exceeded_max_len > 0; exceeded_max_len--) { |
| 512 | struct msgb *msgb_drop; |
| 513 | msgb_drop = msgb_dequeue_count(&link_info->stored_msgs, |
| 514 | &link_info->stored_msgs_len); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 515 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 516 | "Dropping stored msgb from list " |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 517 | "(!acq imsi, length %d, max_len exceeded)\n", |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 518 | link_info->stored_msgs_len); |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 519 | |
| 520 | msgb_free(msgb_drop); |
| 521 | } |
| 522 | } |
| 523 | |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 524 | /* Enqueue unpatched messages */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 525 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 526 | "IMSI acquisition in progress, " |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 527 | "storing message (%s)\n", |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 528 | parse_ctx->llc_msg_name ? parse_ctx->llc_msg_name : "BSSGP"); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 529 | |
Pau Espin Pedrol | 816a67d | 2018-08-15 13:53:48 +0200 | [diff] [blame] | 530 | stored_msg = bssgp_msgb_copy(msg, "process_bssgp_ul"); |
Pau Espin Pedrol | 67f1d1e | 2018-08-16 12:11:46 +0200 | [diff] [blame] | 531 | msgb_enqueue_count(&link_info->stored_msgs, stored_msg, |
| 532 | &link_info->stored_msgs_len); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 533 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 534 | if (!link_info->imsi_acq_pending) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 535 | LOGPBVC_CAT(bvc, DLLC, LOGL_INFO, |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 536 | "IMSI is required but not available, " |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 537 | "initiating identification procedure (%s)\n", |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 538 | parse_ctx->llc_msg_name ? parse_ctx->llc_msg_name : "BSSGP"); |
| 539 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 540 | gbproxy_acquire_imsi(bvc, link_info, msgb_bvci(msg)); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 541 | |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 542 | /* There is no explicit retransmission handling, the |
| 543 | * implementation relies on the MS doing proper retransmissions |
| 544 | * of the triggering message instead */ |
| 545 | |
Harald Welte | aed46ec | 2019-03-22 09:44:42 +0100 | [diff] [blame] | 546 | link_info->imsi_acq_pending = true; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 547 | } |
| 548 | |
Jacob Erlbeck | 6bafa4c | 2014-09-11 11:35:17 +0200 | [diff] [blame] | 549 | return 0; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 550 | } |
| 551 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 552 | struct gbproxy_bvc *gbproxy_find_bvc(struct gbproxy_config *cfg, |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 553 | struct msgb *msg, |
| 554 | struct gprs_gb_parse_context *parse_ctx) |
| 555 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 556 | struct gbproxy_bvc *bvc = NULL; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 557 | |
| 558 | if (msgb_bvci(msg) >= 2) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 559 | bvc = gbproxy_bvc_by_bvci(cfg, msgb_bvci(msg)); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 560 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 561 | if (!bvc && !parse_ctx->to_bss) |
| 562 | bvc = gbproxy_bvc_by_nsei(cfg, msgb_nsei(msg)); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 563 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 564 | if (!bvc) |
| 565 | bvc = gbproxy_bvc_by_bssgp_tlv(cfg, &parse_ctx->bssgp_tp); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 566 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 567 | if (!bvc) { |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 568 | LOGP(DLLC, LOGL_INFO, |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 569 | "NSE(%05u/%s) patching: didn't find bvc for message, " |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 570 | "PDU %d\n", |
| 571 | msgb_nsei(msg), parse_ctx->to_bss ? "BSS" : "SGSN", |
| 572 | parse_ctx->pdu_type); |
| 573 | /* Increment counter */ |
| 574 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PATCH_PEER_ERR]); |
| 575 | } |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 576 | return bvc; |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 577 | } |
| 578 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 579 | /* patch BSSGP message */ |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 580 | static int gbprox_process_bssgp_ul(struct gbproxy_config *cfg, |
| 581 | struct msgb *msg, |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 582 | struct gbproxy_bvc *bvc) |
Jacob Erlbeck | c812882 | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 583 | { |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 584 | struct gprs_gb_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 585 | int rc; |
Jacob Erlbeck | c812882 | 2014-08-07 16:07:24 +0200 | [diff] [blame] | 586 | int len_change = 0; |
Jacob Erlbeck | 7b821d0 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 587 | time_t now; |
Jacob Erlbeck | c6807c4 | 2014-09-19 16:34:01 +0200 | [diff] [blame] | 588 | struct timespec ts = {0,}; |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 589 | struct gbproxy_link_info *link_info = NULL; |
Jacob Erlbeck | cabd24b | 2014-08-27 12:51:07 +0200 | [diff] [blame] | 590 | uint32_t sgsn_nsei = cfg->nsip_sgsn_nsei; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 591 | |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 592 | if (!cfg->core_plmn.mcc && !cfg->core_plmn.mnc && !cfg->core_apn && |
Jacob Erlbeck | 1abfdc2 | 2014-09-04 11:42:08 +0200 | [diff] [blame] | 593 | !cfg->acquire_imsi && !cfg->patch_ptmsi && !cfg->route_to_sgsn2) |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 594 | return 1; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 595 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 596 | parse_ctx.to_bss = 0; |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 597 | parse_ctx.peer_nsei = msgb_nsei(msg); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 598 | |
| 599 | /* Parse BSSGP/LLC */ |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 600 | rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 601 | &parse_ctx); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 602 | |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 603 | if (!rc && !parse_ctx.need_decryption) { |
| 604 | LOGP(DGPRS, LOGL_ERROR, |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 605 | "NSE(%05u/BSS) patching: failed to parse invalid %s message\n", |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 606 | msgb_nsei(msg), gprs_gb_message_name(&parse_ctx, "NS_UNITDATA")); |
| 607 | gprs_gb_log_parse_context(LOGL_NOTICE, &parse_ctx, "NS_UNITDATA"); |
| 608 | LOGP(DGPRS, LOGL_NOTICE, |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 609 | "NSE(%05u/BSS) invalid message was: %s\n", |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 610 | msgb_nsei(msg), msgb_hexdump(msg)); |
| 611 | return 0; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 612 | } |
| 613 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 614 | /* Get bvc */ |
| 615 | if (!bvc) |
| 616 | bvc = gbproxy_find_bvc(cfg, msg, &parse_ctx); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 617 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 618 | if (!bvc) |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 619 | return 0; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 620 | |
Jacob Erlbeck | c6807c4 | 2014-09-19 16:34:01 +0200 | [diff] [blame] | 621 | |
Pau Espin Pedrol | 36abead | 2018-08-17 13:27:20 +0200 | [diff] [blame] | 622 | osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
Jacob Erlbeck | c6807c4 | 2014-09-19 16:34:01 +0200 | [diff] [blame] | 623 | now = ts.tv_sec; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 624 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 625 | gbprox_update_current_raid(parse_ctx.bssgp_raid_enc, bvc, |
Jacob Erlbeck | 12496dd | 2014-08-18 15:41:41 +0200 | [diff] [blame] | 626 | parse_ctx.llc_msg_name); |
| 627 | |
Jacob Erlbeck | 1c407aa | 2014-10-09 12:16:17 +0200 | [diff] [blame] | 628 | gprs_gb_log_parse_context(LOGL_DEBUG, &parse_ctx, "NS_UNITDATA"); |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 629 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 630 | link_info = gbproxy_update_link_state_ul(bvc, now, &parse_ctx); |
Jacob Erlbeck | 3159114 | 2014-09-03 11:59:48 +0200 | [diff] [blame] | 631 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 632 | if (parse_ctx.g48_hdr) { |
| 633 | switch (parse_ctx.g48_hdr->msg_type) { |
| 634 | case GSM48_MT_GMM_ATTACH_REQ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 635 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REQS]); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 636 | break; |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 637 | case GSM48_MT_GMM_DETACH_REQ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 638 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_DETACH_REQS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 639 | break; |
| 640 | case GSM48_MT_GMM_ATTACH_COMPL: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 641 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_COMPLS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 642 | break; |
| 643 | case GSM48_MT_GMM_RA_UPD_REQ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 644 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_REQS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 645 | break; |
| 646 | case GSM48_MT_GMM_RA_UPD_COMPL: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 647 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_COMPLS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 648 | break; |
| 649 | case GSM48_MT_GMM_STATUS: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 650 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_GMM_STATUS_BSS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 651 | break; |
| 652 | case GSM48_MT_GSM_ACT_PDP_REQ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 653 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_REQS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 654 | break; |
| 655 | case GSM48_MT_GSM_DEACT_PDP_REQ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 656 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_PDP_DEACT_REQS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 657 | break; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 658 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 659 | default: |
| 660 | break; |
| 661 | } |
| 662 | } |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 663 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 664 | if (link_info && cfg->route_to_sgsn2) { |
| 665 | if (cfg->acquire_imsi && link_info->imsi_len == 0) |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 666 | sgsn_nsei = 0xffff; |
Jacob Erlbeck | b36032c | 2014-09-25 13:21:48 +0200 | [diff] [blame] | 667 | else if (gbproxy_imsi_matches(cfg, GBPROX_MATCH_ROUTING, |
Jacob Erlbeck | 9a83d7a | 2014-09-25 11:17:31 +0200 | [diff] [blame] | 668 | link_info)) |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 669 | sgsn_nsei = cfg->nsip_sgsn2_nsei; |
Jacob Erlbeck | cabd24b | 2014-08-27 12:51:07 +0200 | [diff] [blame] | 670 | } |
| 671 | |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 672 | if (link_info) |
| 673 | link_info->sgsn_nsei = sgsn_nsei; |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 674 | |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 675 | /* Handle IMSI acquisition */ |
| 676 | if (cfg->acquire_imsi) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 677 | rc = gbproxy_imsi_acquisition(bvc, msg, now, link_info, |
Jacob Erlbeck | 9a6b763 | 2014-09-19 13:23:21 +0200 | [diff] [blame] | 678 | &parse_ctx); |
Jacob Erlbeck | 0b243a1 | 2014-09-11 10:30:21 +0200 | [diff] [blame] | 679 | if (rc <= 0) |
| 680 | return rc; |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 681 | } |
| 682 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 683 | gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 684 | bvc, link_info, &len_change, &parse_ctx); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 685 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 686 | gbproxy_update_link_state_after(bvc, link_info, now, &parse_ctx); |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 687 | |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 688 | if (sgsn_nsei != cfg->nsip_sgsn_nsei) { |
Jacob Erlbeck | cabd24b | 2014-08-27 12:51:07 +0200 | [diff] [blame] | 689 | /* Send message directly to the selected SGSN */ |
| 690 | rc = gbprox_relay2sgsn(cfg, msg, msgb_bvci(msg), sgsn_nsei); |
| 691 | /* Don't let the calling code handle the transmission */ |
| 692 | return 0; |
| 693 | } |
| 694 | |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 695 | return 1; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 696 | } |
| 697 | |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 698 | /* patch BSSGP message to use core_plmn.mcc/mnc on the SGSN side */ |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 699 | static void gbprox_process_bssgp_dl(struct gbproxy_config *cfg, |
| 700 | struct msgb *msg, |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 701 | struct gbproxy_bvc *bvc) |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 702 | { |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 703 | struct gprs_gb_parse_context parse_ctx = {0}; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 704 | int rc; |
| 705 | int len_change = 0; |
| 706 | time_t now; |
Jacob Erlbeck | c6807c4 | 2014-09-19 16:34:01 +0200 | [diff] [blame] | 707 | struct timespec ts = {0,}; |
Jacob Erlbeck | 91d2f8a | 2014-09-19 15:07:27 +0200 | [diff] [blame] | 708 | struct gbproxy_link_info *link_info = NULL; |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 709 | |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 710 | if (!cfg->core_plmn.mcc && !cfg->core_plmn.mnc && !cfg->core_apn && |
Jacob Erlbeck | 1abfdc2 | 2014-09-04 11:42:08 +0200 | [diff] [blame] | 711 | !cfg->acquire_imsi && !cfg->patch_ptmsi && !cfg->route_to_sgsn2) |
| 712 | return; |
| 713 | |
Jacob Erlbeck | 9057bc3 | 2014-08-12 16:30:30 +0200 | [diff] [blame] | 714 | parse_ctx.to_bss = 1; |
Jacob Erlbeck | 91a0e86 | 2014-09-17 10:56:38 +0200 | [diff] [blame] | 715 | parse_ctx.peer_nsei = msgb_nsei(msg); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 716 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 717 | rc = gprs_gb_parse_bssgp(msgb_bssgph(msg), msgb_bssgp_len(msg), |
| 718 | &parse_ctx); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 719 | |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 720 | if (!rc && !parse_ctx.need_decryption) { |
| 721 | LOGP(DGPRS, LOGL_ERROR, |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 722 | "NSE(%05u/SGSN) patching: failed to parse invalid %s message\n", |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 723 | msgb_nsei(msg), gprs_gb_message_name(&parse_ctx, "NS_UNITDATA")); |
| 724 | gprs_gb_log_parse_context(LOGL_NOTICE, &parse_ctx, "NS_UNITDATA"); |
| 725 | LOGP(DGPRS, LOGL_NOTICE, |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 726 | "NSE(%05u/SGSN) invalid message was: %s\n", |
Jacob Erlbeck | b4f0e80 | 2014-10-09 12:28:15 +0200 | [diff] [blame] | 727 | msgb_nsei(msg), msgb_hexdump(msg)); |
| 728 | return; |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 729 | } |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 730 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 731 | /* Get bvc */ |
| 732 | if (!bvc) |
| 733 | bvc = gbproxy_find_bvc(cfg, msg, &parse_ctx); |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 734 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 735 | if (!bvc) |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 736 | return; |
Jacob Erlbeck | 006c038 | 2014-05-27 13:49:04 +0200 | [diff] [blame] | 737 | |
Pau Espin Pedrol | 36abead | 2018-08-17 13:27:20 +0200 | [diff] [blame] | 738 | osmo_clock_gettime(CLOCK_MONOTONIC, &ts); |
Jacob Erlbeck | c6807c4 | 2014-09-19 16:34:01 +0200 | [diff] [blame] | 739 | now = ts.tv_sec; |
Jacob Erlbeck | 7b821d0 | 2014-08-08 08:37:37 +0200 | [diff] [blame] | 740 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 741 | if (parse_ctx.g48_hdr) { |
| 742 | switch (parse_ctx.g48_hdr->msg_type) { |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 743 | case GSM48_MT_GMM_ATTACH_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 744 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_ACKS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 745 | break; |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 746 | case GSM48_MT_GMM_ATTACH_REJ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 747 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_ATTACH_REJS]); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 748 | break; |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 749 | case GSM48_MT_GMM_DETACH_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 750 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_DETACH_ACKS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 751 | break; |
| 752 | case GSM48_MT_GMM_RA_UPD_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 753 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_ACKS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 754 | break; |
| 755 | case GSM48_MT_GMM_RA_UPD_REJ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 756 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_RA_UPD_REJS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 757 | break; |
| 758 | case GSM48_MT_GMM_STATUS: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 759 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_GMM_STATUS_SGSN]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 760 | break; |
| 761 | case GSM48_MT_GSM_ACT_PDP_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 762 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_ACKS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 763 | break; |
| 764 | case GSM48_MT_GSM_ACT_PDP_REJ: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 765 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_PDP_ACT_REJS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 766 | break; |
| 767 | case GSM48_MT_GSM_DEACT_PDP_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 768 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_PDP_DEACT_ACKS]); |
Holger Hans Peter Freyther | 98fa3dc | 2015-11-09 14:30:22 +0100 | [diff] [blame] | 769 | break; |
Jacob Erlbeck | 91fb680 | 2014-05-28 10:59:10 +0200 | [diff] [blame] | 770 | |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 771 | default: |
| 772 | break; |
| 773 | } |
| 774 | } |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 775 | |
Jacob Erlbeck | 1c407aa | 2014-10-09 12:16:17 +0200 | [diff] [blame] | 776 | gprs_gb_log_parse_context(LOGL_DEBUG, &parse_ctx, "NS_UNITDATA"); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 777 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 778 | link_info = gbproxy_update_link_state_dl(bvc, now, &parse_ctx); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 779 | |
| 780 | gbproxy_patch_bssgp(msg, msgb_bssgph(msg), msgb_bssgp_len(msg), |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 781 | bvc, link_info, &len_change, &parse_ctx); |
Jacob Erlbeck | 9114bee | 2014-08-19 12:21:01 +0200 | [diff] [blame] | 782 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 783 | gbproxy_update_link_state_after(bvc, link_info, now, &parse_ctx); |
Jacob Erlbeck | 2db2512 | 2014-08-06 12:41:31 +0200 | [diff] [blame] | 784 | |
Jacob Erlbeck | 03551e5 | 2014-06-27 19:56:05 +0200 | [diff] [blame] | 785 | return; |
Jacob Erlbeck | 67a4445 | 2014-05-19 10:14:58 +0200 | [diff] [blame] | 786 | } |
| 787 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 788 | /* feed a message down the NS-VC associated with the specified bvc */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 789 | static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 790 | uint16_t ns_bvci, uint16_t sgsn_nsei) |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 791 | { |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 792 | /* create a copy of the message so the old one can |
| 793 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 794 | struct gprs_ns2_inst *nsi = cfg->nsi; |
| 795 | struct osmo_gprs_ns2_prim nsp = {}; |
Pau Espin Pedrol | 816a67d | 2018-08-15 13:53:48 +0200 | [diff] [blame] | 796 | struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2sgsn"); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 797 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 798 | |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 799 | DEBUGP(DGPRS, "NSE(%05u/BSS)-BVC(%05u) proxying BTS->SGSN NSE(%05u/SGSN)\n", |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 800 | msgb_nsei(msg), ns_bvci, sgsn_nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 801 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 802 | nsp.bvci = ns_bvci; |
| 803 | nsp.nsei = sgsn_nsei; |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 804 | |
Harald Welte | 69619e3 | 2010-05-03 19:05:10 +0200 | [diff] [blame] | 805 | strip_ns_hdr(msg); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 806 | osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, |
| 807 | PRIM_OP_REQUEST, msg); |
| 808 | rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 809 | if (rc < 0) |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 810 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_TX_ERR_SGSN]); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 811 | return rc; |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 812 | } |
| 813 | |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 814 | /* feed a message down the NSE */ |
| 815 | static int gbprox_relay2nse(struct msgb *old_msg, struct gbproxy_nse *nse, |
Daniel Willmann | 8bca8de | 2020-11-03 21:11:45 +0100 | [diff] [blame] | 816 | uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 817 | { |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 818 | OSMO_ASSERT(nse); |
| 819 | OSMO_ASSERT(nse->cfg); |
| 820 | |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 821 | /* create a copy of the message so the old one can |
| 822 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 823 | struct gprs_ns2_inst *nsi = nse->cfg->nsi; |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 824 | struct osmo_gprs_ns2_prim nsp = {}; |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 825 | struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2nse"); |
Harald Welte | 2636e89 | 2020-11-18 12:01:46 +0100 | [diff] [blame] | 826 | uint32_t tlli; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 827 | int rc; |
Harald Welte | 39d0bb5 | 2010-05-12 18:10:25 +0000 | [diff] [blame] | 828 | |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 829 | DEBUGP(DGPRS, "NSE(%05u/SGSN)-BVC(%05u) proxying SGSN->BSS NSE(%05u/BSS)\n", |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 830 | msgb_nsei(msg), ns_bvci, nse->nsei); |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 831 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 832 | nsp.bvci = ns_bvci; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 833 | nsp.nsei = nse->nsei; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 834 | |
Harald Welte | 0ab535b | 2010-05-13 10:34:56 +0200 | [diff] [blame] | 835 | /* 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] | 836 | strip_ns_hdr(msg); |
| 837 | |
Harald Welte | 2636e89 | 2020-11-18 12:01:46 +0100 | [diff] [blame] | 838 | /* TS 48.018 Section 5.4.2: The link selector parameter is |
| 839 | * defined in 3GPP TS 48.016. At one side of the Gb interface, |
| 840 | * all BSSGP UNITDATA PDUs related to an MS shall be passed with |
| 841 | * the same LSP, e.g. the LSP contains the MS's TLLI, to the |
| 842 | * underlying network service. */ |
| 843 | if (gprs_gb_parse_tlli(msgb_data(msg), msgb_length(msg), &tlli) == 1) |
| 844 | nsp.u.unitdata.link_selector = tlli; |
| 845 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 846 | osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, |
| 847 | PRIM_OP_REQUEST, msg); |
| 848 | rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 849 | /* FIXME: We need a counter group for gbproxy_nse */ |
| 850 | //if (rc < 0) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 851 | // rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 852 | |
| 853 | return rc; |
| 854 | } |
| 855 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 856 | /* feed a message down the NS-VC associated with the specified bvc */ |
| 857 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_bvc *bvc, |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 858 | uint16_t ns_bvci) |
| 859 | { |
| 860 | int rc; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 861 | struct gbproxy_nse *nse = bvc->nse; |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 862 | OSMO_ASSERT(nse); |
| 863 | |
| 864 | rc = gbprox_relay2nse(old_msg, nse, ns_bvci); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 865 | if (rc < 0) |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 866 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_TX_ERR]); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 867 | |
| 868 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 869 | } |
| 870 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 871 | static int block_unblock_bvc(struct gbproxy_config *cfg, uint16_t ptp_bvci, uint8_t pdu_type) |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 872 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 873 | struct gbproxy_bvc *bvc; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 874 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 875 | bvc = gbproxy_bvc_by_bvci(cfg, ptp_bvci); |
| 876 | if (!bvc) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 877 | LOGP(DGPRS, LOGL_ERROR, "BVC(%05u/??) Cannot find BSS\n", |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 878 | ptp_bvci); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 879 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 880 | return -ENOENT; |
| 881 | } |
| 882 | |
| 883 | switch (pdu_type) { |
| 884 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 885 | bvc->blocked = true; |
| 886 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_BLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 887 | break; |
| 888 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 889 | bvc->blocked = false; |
| 890 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_UNBLOCKED]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 891 | break; |
| 892 | default: |
| 893 | break; |
| 894 | } |
| 895 | return 0; |
| 896 | } |
| 897 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 898 | /* Send a message to a bvc identified by ptp_bvci but using ns_bvci |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 899 | * in the NS hdr */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 900 | 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] | 901 | uint16_t ns_bvci) |
| 902 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 903 | struct gbproxy_bvc *bvc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 904 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 905 | bvc = gbproxy_bvc_by_bvci(cfg, ptp_bvci); |
| 906 | if (!bvc) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 907 | LOGP(DGPRS, LOGL_ERROR, "BVC(%05u/??) Cannot find BSS\n", |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 908 | ptp_bvci); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 909 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 910 | return -ENOENT; |
Harald Welte | 1c77c6e | 2010-05-03 21:37:11 +0200 | [diff] [blame] | 911 | } |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 912 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 913 | return gbprox_relay2peer(msg, bvc, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 914 | } |
| 915 | |
Harald Welte | b1fd902 | 2012-06-17 12:16:31 +0800 | [diff] [blame] | 916 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 917 | { |
| 918 | return 0; |
| 919 | } |
| 920 | |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 921 | /* Receive an incoming PTP message from a BSS-side NS-VC */ |
| 922 | static int gbprox_rx_ptp_from_bss(struct gbproxy_config *cfg, |
| 923 | struct msgb *msg, uint16_t nsei, |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 924 | uint16_t ns_bvci) |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 925 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 926 | struct gbproxy_bvc *bvc; |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 927 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| 928 | uint8_t pdu_type = bgph->pdu_type; |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 929 | int rc; |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 930 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 931 | bvc = gbproxy_bvc_by_bvci(cfg, ns_bvci); |
| 932 | if (!bvc) { |
| 933 | LOGP(DGPRS, LOGL_NOTICE, "BVC(%05u/??) Didn't find bvc " |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 934 | "for PTP message from NSE(%05u/BSS), " |
Jacob Erlbeck | 058ae12 | 2014-10-10 09:07:04 +0200 | [diff] [blame] | 935 | "discarding message\n", |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 936 | ns_bvci, nsei); |
Jacob Erlbeck | 058ae12 | 2014-10-10 09:07:04 +0200 | [diff] [blame] | 937 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 938 | &ns_bvci, msg); |
| 939 | } |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 940 | |
Daniel Willmann | 6626bbc | 2020-12-02 17:46:56 +0100 | [diff] [blame] | 941 | /* TODO: Should we discard this message if the check fails */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 942 | check_bvc_nsei(bvc, nsei); |
Jacob Erlbeck | 43b8f9f | 2014-10-02 14:56:44 +0200 | [diff] [blame] | 943 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 944 | rc = gbprox_process_bssgp_ul(cfg, msg, bvc); |
Jacob Erlbeck | 058ae12 | 2014-10-10 09:07:04 +0200 | [diff] [blame] | 945 | if (!rc) |
Jacob Erlbeck | 5f4ef32 | 2014-08-22 17:10:01 +0200 | [diff] [blame] | 946 | return 0; |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 947 | |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 948 | switch (pdu_type) { |
| 949 | case BSSGP_PDUT_FLOW_CONTROL_BVC: |
| 950 | if (!cfg->route_to_sgsn2) |
| 951 | break; |
| 952 | |
| 953 | /* Send a copy to the secondary SGSN */ |
| 954 | gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn2_nsei); |
| 955 | break; |
| 956 | default: |
| 957 | break; |
| 958 | } |
| 959 | |
| 960 | |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 961 | return gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn_nsei); |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 962 | } |
| 963 | |
| 964 | /* Receive an incoming PTP message from a SGSN-side NS-VC */ |
| 965 | static int gbprox_rx_ptp_from_sgsn(struct gbproxy_config *cfg, |
| 966 | struct msgb *msg, uint16_t nsei, |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 967 | uint16_t ns_bvci) |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 968 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 969 | struct gbproxy_bvc *bvc; |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 970 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| 971 | uint8_t pdu_type = bgph->pdu_type; |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 972 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 973 | bvc = gbproxy_bvc_by_bvci(cfg, ns_bvci); |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 974 | |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 975 | /* Send status messages before patching */ |
| 976 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 977 | if (!bvc) { |
| 978 | LOGP(DGPRS, LOGL_INFO, "BVC(%05u/??) Didn't find bvc for " |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 979 | "for message from NSE(%05u/SGSN)\n", |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 980 | ns_bvci, nsei); |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 981 | rate_ctr_inc(&cfg->ctrg-> |
| 982 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
| 983 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
| 984 | &ns_bvci, msg); |
| 985 | } |
| 986 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 987 | if (bvc->blocked) { |
| 988 | LOGPBVC(bvc, LOGL_NOTICE, "Dropping PDU for " |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 989 | "blocked BVC via NSE(%05u/SGSN)\n", nsei); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 990 | rate_ctr_inc(&bvc->ctrg->ctr[GBPROX_PEER_CTR_DROPPED]); |
Jacob Erlbeck | 17b42b8 | 2014-08-29 12:20:15 +0200 | [diff] [blame] | 991 | return bssgp_tx_status(BSSGP_CAUSE_BVCI_BLOCKED, &ns_bvci, msg); |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 992 | } |
| 993 | |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 994 | switch (pdu_type) { |
| 995 | case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
| 996 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 997 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 998 | if (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei) |
| 999 | /* Hide ACKs from the secondary SGSN, the primary SGSN |
| 1000 | * is responsible to send them. */ |
| 1001 | return 0; |
| 1002 | break; |
| 1003 | default: |
| 1004 | break; |
| 1005 | } |
| 1006 | |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1007 | /* Optionally patch the message */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1008 | gbprox_process_bssgp_dl(cfg, msg, bvc); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1009 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1010 | return gbprox_relay2peer(msg, bvc, ns_bvci); |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 1011 | } |
| 1012 | |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1013 | /* process a BVC-RESET message from the BSS side */ |
| 1014 | static int gbprox_rx_bvc_reset_from_bss(struct gbproxy_config *cfg, struct msgb *msg, |
| 1015 | uint16_t nsei, struct tlv_parsed *tp, |
| 1016 | int *copy_to_sgsn2) |
| 1017 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1018 | struct gbproxy_bvc *from_bvc = NULL; |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1019 | uint16_t bvci; |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1020 | |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1021 | if (!TLVP_PRES_LEN(tp, BSSGP_IE_BVCI, 2) || !TLVP_PRES_LEN(tp, BSSGP_IE_CAUSE, 1)) { |
Harald Welte | fb7f8c5 | 2020-12-02 23:29:38 +0100 | [diff] [blame] | 1022 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
| 1023 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| 1024 | } |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1025 | |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1026 | bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 1027 | LOGP(DGPRS, LOGL_INFO, "NSE(%05u) Rx BVC RESET (BVCI=%05u)\n", nsei, bvci); |
| 1028 | if (bvci == 0) { |
| 1029 | /* If we receive a BVC reset on the signalling endpoint, we |
| 1030 | * don't want the SGSN to reset, as the signalling endpoint |
| 1031 | * is common for all point-to-point BVCs (and thus all BTS) */ |
Harald Welte | 5525371 | 2020-12-02 23:06:37 +0100 | [diff] [blame] | 1032 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1033 | /* Ensure the NSE bvc is there and clear all PtP BVCs */ |
Harald Welte | 5525371 | 2020-12-02 23:06:37 +0100 | [diff] [blame] | 1034 | struct gbproxy_nse *nse = gbproxy_nse_by_nsei_or_new(cfg, nsei); |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1035 | if (!nse) { |
| 1036 | LOGP(DGPRS, LOGL_ERROR, "Could not create NSE(%05u)\n", nsei); |
| 1037 | bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, 0, msg); |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1038 | return 0; |
| 1039 | } |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1040 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1041 | gbproxy_cleanup_bvcs(cfg, nsei, 0); |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1042 | |
| 1043 | /* FIXME: only do this if SGSN is alive! */ |
Harald Welte | 5525371 | 2020-12-02 23:06:37 +0100 | [diff] [blame] | 1044 | LOGPNSE(nse, LOGL_INFO, "Tx fake BVC RESET ACK of BVCI=0\n"); |
Harald Welte | 1239cf4 | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 1045 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, nsei, 0, 0); |
| 1046 | return 0; |
| 1047 | } else { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1048 | from_bvc = gbproxy_bvc_by_bvci(cfg, bvci); |
| 1049 | if (!from_bvc) { |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1050 | struct gbproxy_nse *nse = gbproxy_nse_by_nsei(cfg, nsei); |
| 1051 | if (!nse) { |
| 1052 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) Got PtP BVC reset before signalling reset for " |
| 1053 | "BVCI=%05u\n", nsei, bvci); |
| 1054 | bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_STATE, NULL, msg); |
| 1055 | return 0; |
| 1056 | } |
| 1057 | /* if a PTP-BVC is reset, and we don't know that |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1058 | * PTP-BVCI yet, we should allocate a new bvc */ |
| 1059 | from_bvc = gbproxy_bvc_alloc(nse, bvci); |
| 1060 | OSMO_ASSERT(from_bvc); |
| 1061 | LOGPBVC(from_bvc, LOGL_INFO, "Allocated new bvc\n"); |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1062 | } |
| 1063 | |
| 1064 | /* Could have moved to a different NSE */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1065 | if (!check_bvc_nsei(from_bvc, nsei)) { |
| 1066 | LOGPBVC(from_bvc, LOGL_NOTICE, "moving bvc to NSE(%05u)\n", nsei); |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1067 | |
| 1068 | struct gbproxy_nse *nse_new = gbproxy_nse_by_nsei(cfg, nsei); |
| 1069 | if (!nse_new) { |
| 1070 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) Got PtP BVC reset before signalling reset for " |
| 1071 | "BVCI=%05u\n", bvci, nsei); |
| 1072 | bssgp_tx_status(BSSGP_CAUSE_PDU_INCOMP_STATE, NULL, msg); |
| 1073 | return 0; |
| 1074 | } |
| 1075 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1076 | /* Move bvc to different NSE */ |
| 1077 | gbproxy_bvc_move(from_bvc, nse_new); |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1078 | } |
| 1079 | |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1080 | if (TLVP_PRES_LEN(tp, BSSGP_IE_CELL_ID, 8)) { |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1081 | struct gprs_ra_id raid; |
| 1082 | /* We have a Cell Identifier present in this |
| 1083 | * PDU, this means we can extend our local |
| 1084 | * state information about this particular cell |
| 1085 | * */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1086 | memcpy(from_bvc->ra, TLVP_VAL(tp, BSSGP_IE_CELL_ID), sizeof(from_bvc->ra)); |
| 1087 | gsm48_parse_ra(&raid, from_bvc->ra); |
| 1088 | LOGPBVC(from_bvc, LOGL_INFO, "Cell ID %s\n", osmo_rai_name(&raid)); |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1089 | } |
| 1090 | if (cfg->route_to_sgsn2) |
| 1091 | *copy_to_sgsn2 = 1; |
| 1092 | } |
| 1093 | /* continue processing / relaying to SGSN[s] */ |
| 1094 | return 1; |
| 1095 | } |
| 1096 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1097 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1098 | static int gbprox_rx_sig_from_bss(struct gbproxy_config *cfg, |
| 1099 | struct msgb *msg, uint16_t nsei, |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1100 | uint16_t ns_bvci) |
| 1101 | { |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1102 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1103 | struct tlv_parsed tp; |
| 1104 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | ca3620a | 2010-05-03 16:30:59 +0200 | [diff] [blame] | 1105 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1106 | struct gbproxy_bvc *from_bvc = NULL; |
Harald Welte | 70f38d2 | 2010-05-01 12:10:57 +0200 | [diff] [blame] | 1107 | struct gprs_ra_id raid; |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 1108 | int copy_to_sgsn2 = 0; |
Jacob Erlbeck | 5930064 | 2014-09-08 09:04:01 +0200 | [diff] [blame] | 1109 | int rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1110 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1111 | if (ns_bvci != 0 && ns_bvci != 1) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1112 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) BVCI=%05u is not signalling\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1113 | nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1114 | return -EINVAL; |
| 1115 | } |
| 1116 | |
| 1117 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1118 | * just to make sure */ |
| 1119 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1120 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1121 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u) UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1122 | "signalling\n", nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1123 | return -EINVAL; |
| 1124 | } |
| 1125 | |
| 1126 | bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1127 | |
| 1128 | switch (pdu_type) { |
| 1129 | case BSSGP_PDUT_SUSPEND: |
| 1130 | case BSSGP_PDUT_RESUME: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1131 | /* We implement RAI snooping during SUSPEND/RESUME, since it |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1132 | * establishes a relationsip between BVCI/bvc and the routeing |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1133 | * area identification. The snooped information is then used |
| 1134 | * for routing the {SUSPEND,RESUME}_[N]ACK back to the correct |
| 1135 | * BSSGP */ |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1136 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_ROUTEING_AREA, 6)) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1137 | goto err_mand_ie; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1138 | from_bvc = gbproxy_bvc_by_nsei(cfg, nsei); |
| 1139 | if (!from_bvc) |
| 1140 | goto err_no_bvc; |
| 1141 | memcpy(from_bvc->ra, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA), |
| 1142 | sizeof(from_bvc->ra)); |
| 1143 | gsm48_parse_ra(&raid, from_bvc->ra); |
| 1144 | LOGPBVC(from_bvc, LOGL_INFO, "BSSGP SUSPEND/RESUME " |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 1145 | "RAI snooping: RAI %s\n", |
| 1146 | osmo_rai_name(&raid)); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1147 | /* FIXME: This only supports one BSS per RA */ |
| 1148 | break; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1149 | case BSSGP_PDUT_BVC_RESET: |
Harald Welte | ac44d6b | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 1150 | rc = gbprox_rx_bvc_reset_from_bss(cfg, msg, nsei, &tp, ©_to_sgsn2); |
| 1151 | /* if function retruns 0, we terminate processing here */ |
| 1152 | if (rc == 0) |
| 1153 | return 0; |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1154 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1155 | } |
| 1156 | |
Harald Welte | e9ea269 | 2010-05-11 20:20:13 +0200 | [diff] [blame] | 1157 | /* Normally, we can simply pass on all signalling messages from BSS to |
| 1158 | * SGSN */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1159 | rc = gbprox_process_bssgp_ul(cfg, msg, from_bvc); |
Jacob Erlbeck | 5930064 | 2014-09-08 09:04:01 +0200 | [diff] [blame] | 1160 | if (!rc) |
| 1161 | return 0; |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 1162 | |
| 1163 | if (copy_to_sgsn2) |
| 1164 | gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn2_nsei); |
| 1165 | |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 1166 | return gbprox_relay2sgsn(cfg, msg, ns_bvci, cfg->nsip_sgsn_nsei); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1167 | err_no_bvc: |
| 1168 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/BSS) cannot find bvc based on NSEI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1169 | nsei); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1170 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_INV_NSEI]); |
Jacob Erlbeck | 17b42b8 | 2014-08-29 12:20:15 +0200 | [diff] [blame] | 1171 | return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1172 | err_mand_ie: |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1173 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/BSS) missing mandatory RA IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1174 | nsei); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1175 | rate_ctr_inc(&cfg->ctrg->ctr[GBPROX_GLOB_CTR_PROTO_ERR_BSS]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1176 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1177 | } |
| 1178 | |
| 1179 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1180 | 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] | 1181 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1182 | { |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1183 | struct gbproxy_nse *nse; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1184 | struct gbproxy_bvc *bvc; |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1185 | unsigned int n_nses = 0; |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1186 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1187 | int i; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1188 | |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1189 | /* FIXME: Handle paging logic to only page each matching NSE */ |
| 1190 | |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1191 | LOGP(DGPRS, LOGL_INFO, "NSE(%05u/SGSN) BSSGP PAGING\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1192 | nsei); |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1193 | if (TLVP_PRES_LEN(tp, BSSGP_IE_BVCI, 2)) { |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1194 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1195 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1196 | bvc = gbproxy_bvc_by_bvci(cfg, bvci); |
| 1197 | if (!bvc) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1198 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP PAGING: " |
| 1199 | "unable to route: BVCI=%05u unknown\n", nsei, bvci); |
Harald Welte | 3375fa4 | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1200 | rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
| 1201 | return -EINVAL; |
| 1202 | } |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1203 | LOGPBVC(bvc, LOGL_INFO, "routing by BVCI\n"); |
| 1204 | return gbprox_relay2peer(msg, bvc, ns_bvci); |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1205 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_ROUTEING_AREA, 6)) { |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1206 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1207 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1208 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1209 | llist_for_each_entry(bvc, &nse->bvcs, list) { |
| 1210 | if (!memcmp(bvc->ra, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA), 6)) { |
Daniel Willmann | bd356a6 | 2020-12-04 01:24:34 +0100 | [diff] [blame] | 1211 | LOGPNSE(nse, LOGL_INFO, "routing to NSE (RAI match)\n"); |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1212 | gbprox_relay2nse(msg, nse, ns_bvci); |
| 1213 | n_nses++; |
| 1214 | /* Only send it once to each NSE */ |
| 1215 | break; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1216 | } |
Harald Welte | 3375fa4 | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1217 | } |
| 1218 | } |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1219 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_LOCATION_AREA, 5)) { |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1220 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1221 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1222 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1223 | llist_for_each_entry(bvc, &nse->bvcs, list) { |
| 1224 | if (!memcmp(bvc->ra, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA), 5)) { |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 1225 | LOGPNSE(nse, LOGL_INFO, "routing to NSE (LAI match)\n"); |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1226 | gbprox_relay2nse(msg, nse, ns_bvci); |
| 1227 | n_nses++; |
| 1228 | /* Only send it once to each NSE */ |
| 1229 | break; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1230 | } |
Harald Welte | 3375fa4 | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1231 | } |
| 1232 | } |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1233 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_BSS_AREA_ID, 1)) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1234 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1235 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1236 | llist_for_each_entry(bvc, &nse->bvcs, list) { |
Daniel Willmann | 6e8ed27 | 2020-12-02 13:54:21 +0100 | [diff] [blame] | 1237 | LOGPNSE(nse, LOGL_INFO, "routing to NSE (broadcast)\n"); |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1238 | gbprox_relay2nse(msg, nse, ns_bvci); |
| 1239 | n_nses++; |
| 1240 | /* Only send it once to each NSE */ |
| 1241 | break; |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1242 | } |
Harald Welte | 8553f55 | 2020-11-24 11:31:13 +0100 | [diff] [blame] | 1243 | } |
| 1244 | } else { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1245 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BSSGP PAGING: " |
Harald Welte | 8553f55 | 2020-11-24 11:31:13 +0100 | [diff] [blame] | 1246 | "unable to route, missing IE\n", nsei); |
| 1247 | rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
| 1248 | } |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1249 | |
Daniel Willmann | 5937dfd | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1250 | if (n_nses == 0) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1251 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BSSGP PAGING: " |
Harald Welte | 8553f55 | 2020-11-24 11:31:13 +0100 | [diff] [blame] | 1252 | "unable to route, no destination found\n", nsei); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1253 | rate_ctr_inc(&cfg->ctrg->ctr[errctr]); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1254 | return -EINVAL; |
Harald Welte | 4cf12e9 | 2010-05-13 14:14:56 +0200 | [diff] [blame] | 1255 | } |
Harald Welte | 3375fa4 | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1256 | return 0; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1257 | } |
| 1258 | |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1259 | /* Receive an incoming BVC-RESET message from the SGSN */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1260 | static int rx_reset_from_sgsn(struct gbproxy_config *cfg, |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1261 | struct msgb *orig_msg, |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1262 | struct msgb *msg, struct tlv_parsed *tp, |
| 1263 | uint32_t nsei, uint16_t ns_bvci) |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1264 | { |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1265 | struct gbproxy_nse *nse; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1266 | struct gbproxy_bvc *bvc; |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1267 | uint16_t ptp_bvci; |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1268 | int i; |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1269 | |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1270 | if (!TLVP_PRES_LEN(tp, BSSGP_IE_BVCI, 2)) { |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1271 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1272 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1273 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1274 | NULL, orig_msg); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1275 | } |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1276 | ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1277 | |
| 1278 | if (ptp_bvci >= 2) { |
| 1279 | /* A reset for a PTP BVC was received, forward it to its |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1280 | * respective bvc */ |
| 1281 | bvc = gbproxy_bvc_by_bvci(cfg, ptp_bvci); |
| 1282 | if (!bvc) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1283 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) BVCI=%05u: Cannot find BSS\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1284 | nsei, ptp_bvci); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1285 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1286 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1287 | return bssgp_tx_status(BSSGP_CAUSE_UNKNOWN_BVCI, |
Jacob Erlbeck | 17b42b8 | 2014-08-29 12:20:15 +0200 | [diff] [blame] | 1288 | &ptp_bvci, orig_msg); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1289 | } |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1290 | return gbprox_relay2peer(msg, bvc, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1291 | } |
| 1292 | |
| 1293 | /* A reset for the Signalling entity has been received |
| 1294 | * from the SGSN. As the signalling BVCI is shared |
| 1295 | * among all the BSS's that we multiplex, it needs to |
| 1296 | * be relayed */ |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1297 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1298 | llist_for_each_entry(bvc, &nse->bvcs, list) |
| 1299 | gbprox_relay2peer(msg, bvc, ns_bvci); |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1300 | } |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1301 | |
| 1302 | return 0; |
| 1303 | } |
| 1304 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1305 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1306 | static int gbprox_rx_sig_from_sgsn(struct gbproxy_config *cfg, |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1307 | struct msgb *orig_msg, uint32_t nsei, |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1308 | uint16_t ns_bvci) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1309 | { |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1310 | struct bssgp_normal_hdr *bgph = |
| 1311 | (struct bssgp_normal_hdr *) msgb_bssgph(orig_msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1312 | struct tlv_parsed tp; |
| 1313 | uint8_t pdu_type = bgph->pdu_type; |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1314 | int data_len; |
Harald Welte | c8d98ac | 2020-12-02 20:06:04 +0100 | [diff] [blame] | 1315 | struct gbproxy_nse *nse; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1316 | struct gbproxy_bvc *bvc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1317 | uint16_t bvci; |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1318 | struct msgb *msg; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1319 | int rc = 0; |
Jacob Erlbeck | 1e65b0e | 2014-08-29 13:32:17 +0200 | [diff] [blame] | 1320 | int cause; |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1321 | int i; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1322 | |
Harald Welte | c471d3d | 2011-02-06 17:13:12 +0100 | [diff] [blame] | 1323 | if (ns_bvci != 0 && ns_bvci != 1) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1324 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BVCI=%05u is not " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1325 | "signalling\n", nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1326 | /* FIXME: Send proper error message */ |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1327 | return -EINVAL; |
| 1328 | } |
| 1329 | |
| 1330 | /* we actually should never see those two for BVCI == 0, but double-check |
| 1331 | * just to make sure */ |
| 1332 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 1333 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1334 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) UNITDATA not allowed in " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1335 | "signalling\n", nsei); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1336 | return bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, orig_msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1337 | } |
| 1338 | |
Pau Espin Pedrol | 816a67d | 2018-08-15 13:53:48 +0200 | [diff] [blame] | 1339 | msg = bssgp_msgb_copy(orig_msg, "rx_sig_from_sgsn"); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1340 | gbprox_process_bssgp_dl(cfg, msg, NULL); |
| 1341 | /* Update message info */ |
| 1342 | bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
| 1343 | data_len = msgb_bssgp_len(orig_msg) - sizeof(*bgph); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1344 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 1345 | |
| 1346 | switch (pdu_type) { |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1347 | case BSSGP_PDUT_BVC_RESET: |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1348 | rc = rx_reset_from_sgsn(cfg, msg, orig_msg, &tp, nsei, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1349 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1350 | case BSSGP_PDUT_BVC_RESET_ACK: |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 1351 | if (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei) |
| 1352 | break; |
Daniel Willmann | 15c9da2 | 2020-11-03 21:12:42 +0100 | [diff] [blame] | 1353 | /* simple case: BVCI IE is mandatory */ |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1354 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_BVCI, 2)) |
Daniel Willmann | 15c9da2 | 2020-11-03 21:12:42 +0100 | [diff] [blame] | 1355 | goto err_mand_ie; |
| 1356 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
| 1357 | if (bvci == BVCI_SIGNALLING) { |
| 1358 | /* TODO: Reset all PTP BVCIs */ |
| 1359 | } else { |
| 1360 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
| 1361 | } |
| 1362 | break; |
Jacob Erlbeck | c1c57d3 | 2014-08-28 13:20:39 +0200 | [diff] [blame] | 1363 | case BSSGP_PDUT_FLUSH_LL: |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1364 | /* simple case: BVCI IE is mandatory */ |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1365 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_BVCI, 2)) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1366 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1367 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1368 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1369 | break; |
| 1370 | case BSSGP_PDUT_PAGING_PS: |
| 1371 | case BSSGP_PDUT_PAGING_CS: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1372 | /* process the paging request (LAI/RAI lookup) */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1373 | rc = gbprox_rx_paging(cfg, msg, &tp, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1374 | break; |
| 1375 | case BSSGP_PDUT_STATUS: |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1376 | /* Some exception has occurred */ |
Harald Welte | 44c4830 | 2010-05-03 19:22:32 +0200 | [diff] [blame] | 1377 | LOGP(DGPRS, LOGL_NOTICE, |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1378 | "NSE(%05u/SGSN) BSSGP STATUS ", nsei); |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1379 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_CAUSE, 1)) { |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1380 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
| 1381 | goto err_mand_ie; |
| 1382 | } |
Jacob Erlbeck | 1e65b0e | 2014-08-29 13:32:17 +0200 | [diff] [blame] | 1383 | cause = *TLVP_VAL(&tp, BSSGP_IE_CAUSE); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1384 | LOGPC(DGPRS, LOGL_NOTICE, |
| 1385 | "cause=0x%02x(%s) ", *TLVP_VAL(&tp, BSSGP_IE_CAUSE), |
Jacob Erlbeck | 1e65b0e | 2014-08-29 13:32:17 +0200 | [diff] [blame] | 1386 | bssgp_cause_str(cause)); |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1387 | if (TLVP_PRES_LEN(&tp, BSSGP_IE_BVCI, 2)) { |
Jacob Erlbeck | 1e65b0e | 2014-08-29 13:32:17 +0200 | [diff] [blame] | 1388 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1389 | LOGPC(DGPRS, LOGL_NOTICE, "BVCI=%05u\n", bvci); |
Jacob Erlbeck | 1e65b0e | 2014-08-29 13:32:17 +0200 | [diff] [blame] | 1390 | |
| 1391 | if (cause == BSSGP_CAUSE_UNKNOWN_BVCI) |
| 1392 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 0a4050c | 2010-05-11 10:01:17 +0200 | [diff] [blame] | 1393 | } else |
| 1394 | LOGPC(DGPRS, LOGL_NOTICE, "\n"); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1395 | break; |
| 1396 | /* those only exist in the SGSN -> BSS direction */ |
| 1397 | case BSSGP_PDUT_SUSPEND_ACK: |
| 1398 | case BSSGP_PDUT_SUSPEND_NACK: |
| 1399 | case BSSGP_PDUT_RESUME_ACK: |
| 1400 | case BSSGP_PDUT_RESUME_NACK: |
Jacob Erlbeck | 8f50359 | 2014-06-02 10:49:00 +0200 | [diff] [blame] | 1401 | /* RAI IE is mandatory */ |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1402 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_ROUTEING_AREA, 6)) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1403 | goto err_mand_ie; |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1404 | bvc = gbproxy_bvc_by_rai(cfg, TLVP_VAL(&tp, BSSGP_IE_ROUTEING_AREA)); |
| 1405 | if (!bvc) |
| 1406 | goto err_no_bvc; |
| 1407 | rc = gbprox_relay2peer(msg, bvc, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1408 | break; |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1409 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 1410 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
Harald Welte | 6c4c6f0 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1411 | if (!TLVP_PRES_LEN(&tp, BSSGP_IE_BVCI, 2)) |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1412 | goto err_mand_ie; |
Holger Hans Peter Freyther | ffd6856 | 2012-09-04 20:42:20 +0200 | [diff] [blame] | 1413 | bvci = ntohs(tlvp_val16_unal(&tp, BSSGP_IE_BVCI)); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1414 | if (bvci == 0) { |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1415 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP " |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1416 | "%sBLOCK_ACK for signalling BVCI ?!?\n", nsei, |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1417 | pdu_type == BSSGP_PDUT_BVC_UNBLOCK_ACK ? "UN":""); |
Daniel Willmann | 6626bbc | 2020-12-02 17:46:56 +0100 | [diff] [blame] | 1418 | /* TODO: should we send STATUS ? */ |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1419 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1420 | ctr[GBPROX_GLOB_CTR_INV_BVCI]); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1421 | } else { |
| 1422 | /* Mark BVC as (un)blocked */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1423 | block_unblock_bvc(cfg, bvci, pdu_type); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1424 | } |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1425 | rc = gbprox_relay2bvci(cfg, msg, bvci, ns_bvci); |
Harald Welte | 36f98d9 | 2011-02-06 13:09:29 +0100 | [diff] [blame] | 1426 | break; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1427 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | c8d98ac | 2020-12-02 20:06:04 +0100 | [diff] [blame] | 1428 | case BSSGP_PDUT_OVERLOAD: |
| 1429 | LOGP(DGPRS, LOGL_DEBUG, |
| 1430 | "NSE(%05u/SGSN) BSSGP %s: broadcasting\n", nsei, bssgp_pdu_str(pdu_type)); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1431 | /* broadcast to all BSS-side bvcs */ |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1432 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | c8d98ac | 2020-12-02 20:06:04 +0100 | [diff] [blame] | 1433 | gbprox_relay2nse(msg, nse, 0); |
| 1434 | } |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1435 | break; |
| 1436 | default: |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1437 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/SGSN) BSSGP PDU type %s not supported\n", nsei, |
| 1438 | bssgp_pdu_str(pdu_type)); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1439 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1440 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1441 | rc = bssgp_tx_status(BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, orig_msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1442 | break; |
| 1443 | } |
| 1444 | |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1445 | msgb_free(msg); |
| 1446 | |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1447 | return rc; |
| 1448 | err_mand_ie: |
Daniel Willmann | 103a7ec | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 1449 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) missing mandatory IE\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1450 | nsei); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1451 | rate_ctr_inc(&cfg->ctrg-> |
Jacob Erlbeck | bc55574 | 2013-10-18 14:34:55 +0200 | [diff] [blame] | 1452 | ctr[GBPROX_GLOB_CTR_PROTO_ERR_SGSN]); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1453 | msgb_free(msg); |
| 1454 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, orig_msg); |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1455 | err_no_bvc: |
| 1456 | LOGP(DGPRS, LOGL_ERROR, "NSE(%05u/SGSN) cannot find bvc based on RAI\n", |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1457 | nsei); |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1458 | rate_ctr_inc(&cfg->ctrg-> ctr[GBPROX_GLOB_CTR_INV_RAI]); |
Jacob Erlbeck | 4b663ac | 2014-08-21 15:07:11 +0200 | [diff] [blame] | 1459 | msgb_free(msg); |
Jacob Erlbeck | 17b42b8 | 2014-08-29 12:20:15 +0200 | [diff] [blame] | 1460 | return bssgp_tx_status(BSSGP_CAUSE_INV_MAND_INF, NULL, orig_msg); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1461 | } |
| 1462 | |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 1463 | static int gbproxy_is_sgsn_nsei(struct gbproxy_config *cfg, uint16_t nsei) |
| 1464 | { |
| 1465 | return nsei == cfg->nsip_sgsn_nsei || |
| 1466 | (cfg->route_to_sgsn2 && nsei == cfg->nsip_sgsn2_nsei); |
| 1467 | } |
| 1468 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1469 | int gbprox_bssgp_send_cb(void *ctx, struct msgb *msg) |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1470 | { |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1471 | int rc; |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1472 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| 1473 | struct gprs_ns2_inst *nsi = cfg->nsi; |
| 1474 | struct osmo_gprs_ns2_prim nsp = {}; |
| 1475 | |
| 1476 | nsp.bvci = msgb_bvci(msg); |
| 1477 | nsp.nsei = msgb_nsei(msg); |
| 1478 | |
| 1479 | osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, PRIM_OP_REQUEST, msg); |
| 1480 | rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
| 1481 | |
| 1482 | return rc; |
| 1483 | } |
| 1484 | |
| 1485 | /* Main input function for Gb proxy */ |
| 1486 | int gbprox_rcvmsg(void *ctx, struct msgb *msg) |
| 1487 | { |
| 1488 | int rc; |
| 1489 | uint16_t nsei = msgb_nsei(msg); |
| 1490 | uint16_t ns_bvci = msgb_bvci(msg); |
| 1491 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| 1492 | |
Jacob Erlbeck | f4d60c8 | 2014-08-26 14:47:15 +0200 | [diff] [blame] | 1493 | int remote_end_is_sgsn = gbproxy_is_sgsn_nsei(cfg, nsei); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1494 | |
| 1495 | /* Only BVCI=0 messages need special treatment */ |
| 1496 | if (ns_bvci == 0 || ns_bvci == 1) { |
Jacob Erlbeck | e75fec6 | 2013-10-15 12:00:27 +0200 | [diff] [blame] | 1497 | if (remote_end_is_sgsn) |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1498 | rc = gbprox_rx_sig_from_sgsn(cfg, msg, nsei, ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1499 | else |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1500 | rc = gbprox_rx_sig_from_bss(cfg, msg, nsei, ns_bvci); |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1501 | } else { |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 1502 | /* All other BVCI are PTP */ |
| 1503 | if (remote_end_is_sgsn) |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1504 | rc = gbprox_rx_ptp_from_sgsn(cfg, msg, nsei, |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 1505 | ns_bvci); |
| 1506 | else |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1507 | rc = gbprox_rx_ptp_from_bss(cfg, msg, nsei, |
Jacob Erlbeck | 46f1d6f | 2014-08-21 13:45:04 +0200 | [diff] [blame] | 1508 | ns_bvci); |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1509 | } |
| 1510 | |
Harald Welte | 672f5c4 | 2010-05-03 18:54:58 +0200 | [diff] [blame] | 1511 | return rc; |
Harald Welte | 9f75c35 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 1512 | } |
Harald Welte | 85801d0 | 2010-05-11 05:49:43 +0200 | [diff] [blame] | 1513 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1514 | /* TODO: What about handling: |
| 1515 | * NS_AFF_CAUSE_VC_FAILURE, |
| 1516 | NS_AFF_CAUSE_VC_RECOVERY, |
| 1517 | NS_AFF_CAUSE_FAILURE, |
| 1518 | NS_AFF_CAUSE_RECOVERY, |
| 1519 | osmocom own causes |
| 1520 | NS_AFF_CAUSE_SNS_CONFIGURED, |
| 1521 | NS_AFF_CAUSE_SNS_FAILURE, |
| 1522 | */ |
Harald Welte | 1ccbf44 | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 1523 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1524 | void gprs_ns_prim_status_cb(struct gbproxy_config *cfg, struct osmo_gprs_ns2_prim *nsp) |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1525 | { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1526 | /* TODO: bss nsei available/unavailable bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, nsvc->nsei, bvc->bvci, 0); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1527 | * TODO: sgsn nsei available/unavailable |
| 1528 | */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1529 | struct gbproxy_bvc *bvc; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1530 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1531 | switch (nsp->u.status.cause) { |
| 1532 | case NS_AFF_CAUSE_SNS_FAILURE: |
| 1533 | case NS_AFF_CAUSE_SNS_CONFIGURED: |
| 1534 | break; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1535 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1536 | case NS_AFF_CAUSE_RECOVERY: |
| 1537 | LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became available\n", nsp->nsei); |
| 1538 | if (nsp->nsei == cfg->nsip_sgsn_nsei) { |
| 1539 | /* look-up or create the BTS context for this BVC */ |
| 1540 | struct bssgp_bvc_ctx *bctx = btsctx_by_bvci_nsei(nsp->bvci, nsp->nsei); |
| 1541 | if (!bctx) |
| 1542 | bctx = btsctx_alloc(nsp->bvci, nsp->nsei); |
Harald Welte | f69c059 | 2010-05-11 18:29:44 +0200 | [diff] [blame] | 1543 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1544 | bssgp_tx_bvc_reset_nsei_bvci(cfg->nsip_sgsn_nsei, 0, BSSGP_CAUSE_OML_INTERV, NULL, 0); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1545 | } |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1546 | break; |
| 1547 | case NS_AFF_CAUSE_FAILURE: |
| 1548 | if (nsp->nsei == cfg->nsip_sgsn_nsei) { |
| 1549 | /* sgsn */ |
| 1550 | /* TODO: BSVC: block all PtP towards bss */ |
| 1551 | rate_ctr_inc(&cfg->ctrg-> |
| 1552 | ctr[GBPROX_GLOB_CTR_RESTART_RESET_SGSN]); |
| 1553 | } else { |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1554 | /* bss became unavailable |
| 1555 | * TODO: Block all BVC belonging to that NSE */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1556 | bvc = gbproxy_bvc_by_nsei(cfg, nsp->nsei); |
| 1557 | if (!bvc) { |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1558 | /* TODO: use primitive name + status cause name */ |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1559 | LOGP(DGPRS, LOGL_NOTICE, "Received ns2 primitive %d for unknown bvc NSEI=%u\n", |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1560 | nsp->u.status.cause, nsp->nsei); |
Harald Welte | 5e106d7 | 2011-02-06 16:33:29 +0100 | [diff] [blame] | 1561 | break; |
| 1562 | } |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1563 | |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1564 | if (!bvc->blocked) |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1565 | break; |
| 1566 | bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK, cfg->nsip_sgsn_nsei, |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1567 | bvc->bvci, 0); |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1568 | } |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1569 | LOGP(DPCU, LOGL_NOTICE, "NS-NSE %d became unavailable\n", nsp->nsei); |
| 1570 | break; |
| 1571 | default: |
Harald Welte | d97ff68 | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1572 | LOGP(DPCU, LOGL_NOTICE, "NS: Unknown NS-STATUS.ind cause=%s from NS\n", |
| 1573 | gprs_ns2_aff_cause_prim_str(nsp->u.status.cause)); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1574 | break; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1575 | } |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1576 | } |
| 1577 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1578 | /* called by the ns layer */ |
| 1579 | int gprs_ns2_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 1580 | { |
| 1581 | struct osmo_gprs_ns2_prim *nsp; |
| 1582 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
Daniel Willmann | e8c8ec9 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1583 | uintptr_t bvci; |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1584 | int rc = 0; |
| 1585 | |
| 1586 | if (oph->sap != SAP_NS) |
| 1587 | return 0; |
| 1588 | |
| 1589 | nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph); |
| 1590 | |
| 1591 | if (oph->operation != PRIM_OP_INDICATION) { |
Harald Welte | d97ff68 | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1592 | LOGP(DPCU, LOGL_NOTICE, "NS: Unexpected primitive operation %s from NS\n", |
| 1593 | get_value_string(osmo_prim_op_names, oph->operation)); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1594 | return 0; |
| 1595 | } |
| 1596 | |
| 1597 | switch (oph->primitive) { |
| 1598 | case PRIM_NS_UNIT_DATA: |
Daniel Willmann | e8c8ec9 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1599 | |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1600 | /* hand the message into the BSSGP implementation */ |
| 1601 | msgb_bssgph(oph->msg) = oph->msg->l3h; |
| 1602 | msgb_bvci(oph->msg) = nsp->bvci; |
| 1603 | msgb_nsei(oph->msg) = nsp->nsei; |
Daniel Willmann | e8c8ec9 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1604 | bvci = nsp->bvci | BVC_LOG_CTX_FLAG; |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1605 | |
Daniel Willmann | e8c8ec9 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1606 | log_set_context(LOG_CTX_GB_BVC, (void *)bvci); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1607 | rc = gbprox_rcvmsg(cfg, oph->msg); |
Daniel Willmann | 02f2c34 | 2020-11-04 17:32:56 +0100 | [diff] [blame] | 1608 | msgb_free(oph->msg); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1609 | break; |
| 1610 | case PRIM_NS_STATUS: |
| 1611 | gprs_ns_prim_status_cb(cfg, nsp); |
| 1612 | break; |
| 1613 | default: |
Harald Welte | d97ff68 | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1614 | LOGP(DPCU, LOGL_NOTICE, "NS: Unknown prim %s %s from NS\n", |
| 1615 | gprs_ns2_prim_str(oph->primitive), |
| 1616 | get_value_string(osmo_prim_op_names, oph->operation)); |
Alexander Couzens | 82182d0 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1617 | break; |
| 1618 | } |
| 1619 | |
| 1620 | return rc; |
Harald Welte | c1c1dd2 | 2010-05-11 06:34:24 +0200 | [diff] [blame] | 1621 | } |
| 1622 | |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1623 | void gbprox_reset(struct gbproxy_config *cfg) |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1624 | { |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1625 | struct gbproxy_nse *nse; |
| 1626 | struct hlist_node *ntmp; |
| 1627 | int i; |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1628 | |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1629 | hash_for_each_safe(cfg->bss_nses, i, ntmp, nse, list) { |
Harald Welte | 8cd7440 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1630 | struct gbproxy_bvc *bvc, *tmp; |
| 1631 | llist_for_each_entry_safe(bvc, tmp, &nse->bvcs, list) |
| 1632 | gbproxy_bvc_free(bvc); |
Daniel Willmann | 447ad44 | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1633 | |
| 1634 | gbproxy_nse_free(nse); |
| 1635 | } |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1636 | |
Holger Hans Peter Freyther | eece627 | 2014-08-04 15:42:36 +0200 | [diff] [blame] | 1637 | rate_ctr_group_free(cfg->ctrg); |
| 1638 | gbproxy_init_config(cfg); |
Jacob Erlbeck | 72b401f | 2013-10-24 12:48:55 +0200 | [diff] [blame] | 1639 | } |
| 1640 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1641 | int gbproxy_init_config(struct gbproxy_config *cfg) |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1642 | { |
Jacob Erlbeck | 0d37671 | 2014-08-11 19:12:24 +0200 | [diff] [blame] | 1643 | struct timespec tp; |
Jacob Erlbeck | 9a83d7a | 2014-09-25 11:17:31 +0200 | [diff] [blame] | 1644 | |
Harald Welte | 78db244 | 2020-12-05 00:31:07 +0100 | [diff] [blame^] | 1645 | hash_init(cfg->bss_nses); |
Pau Espin Pedrol | b1d1c24 | 2018-10-30 17:27:59 +0100 | [diff] [blame] | 1646 | cfg->ctrg = rate_ctr_group_alloc(tall_sgsn_ctx, &global_ctrg_desc, 0); |
Harald Welte | 26c1465 | 2017-07-12 00:25:51 +0200 | [diff] [blame] | 1647 | if (!cfg->ctrg) { |
| 1648 | LOGP(DGPRS, LOGL_ERROR, "Cannot allocate global counter group!\n"); |
| 1649 | return -1; |
| 1650 | } |
Pau Espin Pedrol | 36abead | 2018-08-17 13:27:20 +0200 | [diff] [blame] | 1651 | osmo_clock_gettime(CLOCK_REALTIME, &tp); |
Jacob Erlbeck | 9a83d7a | 2014-09-25 11:17:31 +0200 | [diff] [blame] | 1652 | |
Holger Hans Peter Freyther | 18739ea | 2014-08-04 11:10:09 +0200 | [diff] [blame] | 1653 | return 0; |
Jacob Erlbeck | 4211d79 | 2013-10-24 12:48:23 +0200 | [diff] [blame] | 1654 | } |