Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1 | /* NS-over-IP proxy */ |
| 2 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 3 | /* (C) 2010-2020 by Harald Welte <laforge@gnumonks.org> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 4 | * (C) 2010-2013 by On-Waves |
| 5 | * (C) 2013 by Holger Hans Peter Freyther |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 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 |
| 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 |
| 16 | * GNU Affero General Public License for more details. |
| 17 | * |
| 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/>. |
| 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> |
| 31 | #include <arpa/inet.h> |
| 32 | #include <time.h> |
| 33 | |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 34 | #include <osmocom/core/hashtable.h> |
Daniel Willmann | 8f407b1 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 35 | #include <osmocom/core/logging.h> |
Daniel Willmann | ee834af | 2020-12-14 16:22:39 +0100 | [diff] [blame] | 36 | #include <osmocom/core/linuxlist.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 37 | #include <osmocom/core/talloc.h> |
| 38 | #include <osmocom/core/select.h> |
| 39 | #include <osmocom/core/rate_ctr.h> |
Daniel Willmann | 1ac920b | 2021-02-11 23:51:49 +0100 | [diff] [blame] | 40 | #include <osmocom/core/signal.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 41 | #include <osmocom/core/stats.h> |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 42 | #include <osmocom/core/utils.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 43 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 44 | #include <osmocom/gprs/gprs_ns2.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 45 | #include <osmocom/gprs/gprs_bssgp.h> |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 46 | #include <osmocom/gprs/gprs_bssgp2.h> |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 47 | #include <osmocom/gprs/gprs_bssgp_bss.h> |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 48 | #include <osmocom/gprs/bssgp_bvc_fsm.h> |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 49 | #include <osmocom/gprs/protocol/gsm_08_18.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 50 | |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 51 | #include <osmocom/gsm/gsm23236.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 52 | #include <osmocom/gsm/gsm_utils.h> |
| 53 | |
Oliver Smith | 29532c2 | 2021-01-29 11:13:00 +0100 | [diff] [blame] | 54 | #include "debug.h" |
Daniel Willmann | a16ecc3 | 2021-03-10 09:57:12 +0100 | [diff] [blame] | 55 | #include <osmocom/gbproxy/gb_proxy.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 56 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 57 | #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 58 | |
| 59 | extern void *tall_sgsn_ctx; |
| 60 | |
| 61 | static const struct rate_ctr_desc global_ctr_description[] = { |
Daniel Willmann | 99a46ff | 2021-09-27 15:39:44 +0200 | [diff] [blame] | 62 | [GBPROX_GLOB_CTR_INV_BVCI] = { "inv-bvci", "Invalid BVC Identifier " }, |
| 63 | [GBPROX_GLOB_CTR_INV_LAI] = { "inv-lai", "Invalid Location Area Identifier" }, |
| 64 | [GBPROX_GLOB_CTR_INV_RAI] = { "inv-rai", "Invalid Routing Area Identifier " }, |
| 65 | [GBPROX_GLOB_CTR_INV_NSEI] = { "inv-nsei", "No BVC established for NSEI " }, |
| 66 | [GBPROX_GLOB_CTR_PROTO_ERR_BSS] = { "proto-err:bss", "BSSGP protocol error (BSS )" }, |
| 67 | [GBPROX_GLOB_CTR_PROTO_ERR_SGSN] = { "proto-err:sgsn", "BSSGP protocol error (SGSN)" }, |
| 68 | [GBPROX_GLOB_CTR_NOT_SUPPORTED_BSS] = { "not-supp:bss", "Feature not supported (BSS )" }, |
| 69 | [GBPROX_GLOB_CTR_NOT_SUPPORTED_SGSN] = { "not-supp:sgsn", "Feature not supported (SGSN)" }, |
| 70 | [GBPROX_GLOB_CTR_RESTART_RESET_SGSN] = { "restart:sgsn", "Restarted RESET procedure (SGSN)" }, |
| 71 | [GBPROX_GLOB_CTR_TX_ERR_SGSN] = { "tx-err:sgsn", "NS Transmission error (SGSN)" }, |
| 72 | [GBPROX_GLOB_CTR_OTHER_ERR] = { "error", "Other error " }, |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 73 | }; |
| 74 | |
| 75 | static const struct rate_ctr_group_desc global_ctrg_desc = { |
| 76 | .group_name_prefix = "gbproxy:global", |
| 77 | .group_description = "GBProxy Global Statistics", |
| 78 | .num_ctr = ARRAY_SIZE(global_ctr_description), |
| 79 | .ctr_desc = global_ctr_description, |
| 80 | .class_id = OSMO_STATS_CLASS_GLOBAL, |
| 81 | }; |
| 82 | |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 83 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_bvc *bvc, |
Daniel Willmann | 35f7d33 | 2020-11-03 21:11:45 +0100 | [diff] [blame] | 84 | uint16_t ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 85 | |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 86 | int tx_status(struct gbproxy_nse *nse, uint16_t ns_bvci, enum gprs_bssgp_cause cause, const uint16_t *bvci, const struct msgb *old_msg) |
| 87 | { |
| 88 | int rc; |
Harald Welte | a0f7073 | 2020-12-05 17:50:23 +0100 | [diff] [blame] | 89 | |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 90 | struct msgb *msg = bssgp2_enc_status(cause, bvci, old_msg, nse->max_sdu_len); |
| 91 | if (!msg) { |
| 92 | LOGPNSE(nse, LOGL_NOTICE, "Unable to encode STATUS message\n"); |
| 93 | return -ENOMEM; |
| 94 | } |
| 95 | |
| 96 | rc = bssgp2_nsi_tx_ptp(nse->cfg->nsi, nse->nsei, ns_bvci, msg, 0); |
| 97 | if (rc < 0) |
| 98 | LOGPNSE(nse, LOGL_NOTICE, "Unable to send STATUS message\n"); |
| 99 | return rc; |
| 100 | } |
| 101 | |
| 102 | /* generate BVC-STATUS mess |
| 103 | age with cause value derived from TLV-parser error */ |
| 104 | static int tx_status_from_tlvp(struct gbproxy_nse *nse, enum osmo_tlv_parser_error tlv_p_err, struct msgb *orig_msg) |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 105 | { |
| 106 | uint8_t bssgp_cause; |
| 107 | switch (tlv_p_err) { |
| 108 | case OSMO_TLVP_ERR_MAND_IE_MISSING: |
| 109 | bssgp_cause = BSSGP_CAUSE_MISSING_MAND_IE; |
| 110 | break; |
| 111 | default: |
| 112 | bssgp_cause = BSSGP_CAUSE_PROTO_ERR_UNSPEC; |
| 113 | } |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 114 | return tx_status(nse, msgb_bvci(orig_msg), bssgp_cause, NULL, orig_msg); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 115 | } |
| 116 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 117 | /* strip off the NS header */ |
| 118 | static void strip_ns_hdr(struct msgb *msg) |
| 119 | { |
| 120 | int strip_len = msgb_bssgph(msg) - msg->data; |
| 121 | msgb_pull(msg, strip_len); |
| 122 | } |
| 123 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 124 | #if 0 |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 125 | /* feed a message down the NS-VC associated with the specified bvc */ |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 126 | static int gbprox_relay2sgsn(struct gbproxy_config *cfg, struct msgb *old_msg, |
| 127 | uint16_t ns_bvci, uint16_t sgsn_nsei) |
| 128 | { |
| 129 | /* create a copy of the message so the old one can |
| 130 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 131 | struct gprs_ns2_inst *nsi = cfg->nsi; |
| 132 | struct osmo_gprs_ns2_prim nsp = {}; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 133 | struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2sgsn"); |
| 134 | int rc; |
| 135 | |
Daniel Willmann | 3696dce | 2020-12-02 16:08:02 +0100 | [diff] [blame] | 136 | DEBUGP(DGPRS, "NSE(%05u/BSS)-BVC(%05u) proxying BTS->SGSN NSE(%05u/SGSN)\n", |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 137 | msgb_nsei(msg), ns_bvci, sgsn_nsei); |
| 138 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 139 | nsp.bvci = ns_bvci; |
| 140 | nsp.nsei = sgsn_nsei; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 141 | |
| 142 | strip_ns_hdr(msg); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 143 | osmo_prim_init(&nsp.oph, SAP_NS, PRIM_NS_UNIT_DATA, |
| 144 | PRIM_OP_REQUEST, msg); |
| 145 | rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 146 | if (rc < 0) |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 147 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, GBPROX_GLOB_CTR_TX_ERR_SGSN)); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 148 | return rc; |
| 149 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 150 | #endif |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 151 | |
Harald Welte | e30985e | 2021-01-28 19:13:19 +0100 | [diff] [blame] | 152 | /*! Determine the TLLI from the given BSSGP message. |
| 153 | * \param[in] bssgp pointer to start of BSSGP header |
| 154 | * \param[in] bssgp_len length of BSSGP message in octets |
| 155 | * \param[out] tlli TLLI (if any) in host byte order |
| 156 | * \returns 1 if TLLI found; 0 if none found; negative on parse error */ |
| 157 | int gprs_gb_parse_tlli(const uint8_t *bssgp, size_t bssgp_len, uint32_t *tlli) |
| 158 | { |
| 159 | const struct bssgp_normal_hdr *bgph; |
| 160 | uint8_t pdu_type; |
| 161 | |
| 162 | if (bssgp_len < sizeof(struct bssgp_normal_hdr)) |
| 163 | return -EINVAL; |
| 164 | |
| 165 | bgph = (struct bssgp_normal_hdr *)bssgp; |
| 166 | pdu_type = bgph->pdu_type; |
| 167 | |
| 168 | if (pdu_type == BSSGP_PDUT_UL_UNITDATA || |
| 169 | pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| 170 | const struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *)bssgp; |
| 171 | if (bssgp_len < sizeof(struct bssgp_ud_hdr)) |
| 172 | return -EINVAL; |
| 173 | *tlli = osmo_load32be((const uint8_t *)&budh->tlli); |
| 174 | return 1; |
| 175 | } else { |
| 176 | const uint8_t *data = bgph->data; |
| 177 | size_t data_len = bssgp_len - sizeof(*bgph); |
| 178 | struct tlv_parsed tp; |
| 179 | |
| 180 | if (bssgp_tlv_parse(&tp, data, data_len) < 0) |
| 181 | return -EINVAL; |
| 182 | |
| 183 | if (TLVP_PRESENT(&tp, BSSGP_IE_TLLI)) { |
| 184 | *tlli = osmo_load32be(TLVP_VAL(&tp, BSSGP_IE_TLLI)); |
| 185 | return 1; |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /* No TLLI present in message */ |
| 190 | return 0; |
| 191 | } |
| 192 | |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 193 | /* feed a message down the NSE */ |
| 194 | static int gbprox_relay2nse(struct msgb *old_msg, struct gbproxy_nse *nse, |
Daniel Willmann | 35f7d33 | 2020-11-03 21:11:45 +0100 | [diff] [blame] | 195 | uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 196 | { |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 197 | OSMO_ASSERT(nse); |
| 198 | OSMO_ASSERT(nse->cfg); |
| 199 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 200 | /* create a copy of the message so the old one can |
| 201 | * be free()d safely when we return from gbprox_rcvmsg() */ |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 202 | struct gprs_ns2_inst *nsi = nse->cfg->nsi; |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 203 | struct msgb *msg = bssgp_msgb_copy(old_msg, "msgb_relay2nse"); |
Daniel Willmann | 44fa201 | 2021-02-12 04:55:40 +0100 | [diff] [blame] | 204 | uint32_t tlli = 0; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 205 | int rc; |
| 206 | |
Daniel Willmann | 98b1b45 | 2020-12-21 10:40:27 +0100 | [diff] [blame] | 207 | DEBUGP(DGPRS, "NSE(%05u/%s)-BVC(%05u/??) proxying to NSE(%05u/%s)\n", msgb_nsei(msg), |
| 208 | !nse->sgsn_facing ? "SGSN" : "BSS", ns_bvci, nse->nsei, nse->sgsn_facing ? "SGSN" : "BSS"); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 209 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 210 | /* Strip the old NS header, it will be replaced with a new one */ |
| 211 | strip_ns_hdr(msg); |
| 212 | |
Harald Welte | fe05958 | 2020-11-18 12:01:46 +0100 | [diff] [blame] | 213 | /* TS 48.018 Section 5.4.2: The link selector parameter is |
| 214 | * defined in 3GPP TS 48.016. At one side of the Gb interface, |
| 215 | * all BSSGP UNITDATA PDUs related to an MS shall be passed with |
| 216 | * the same LSP, e.g. the LSP contains the MS's TLLI, to the |
| 217 | * underlying network service. */ |
Daniel Willmann | 44fa201 | 2021-02-12 04:55:40 +0100 | [diff] [blame] | 218 | gprs_gb_parse_tlli(msgb_data(msg), msgb_length(msg), &tlli); |
Harald Welte | fe05958 | 2020-11-18 12:01:46 +0100 | [diff] [blame] | 219 | |
Daniel Willmann | 44fa201 | 2021-02-12 04:55:40 +0100 | [diff] [blame] | 220 | rc = bssgp2_nsi_tx_ptp(nsi, nse->nsei, ns_bvci, msg, tlli); |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 221 | /* FIXME: We need a counter group for gbproxy_nse */ |
| 222 | //if (rc < 0) |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 223 | // rate_ctr_inc(rate_ctr_group_get_ctr(bvc->ctrg, GBPROX_PEER_CTR_TX_ERR)); |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 224 | |
| 225 | return rc; |
| 226 | } |
| 227 | |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 228 | /* feed a message down the NS-VC associated with the specified bvc */ |
| 229 | static int gbprox_relay2peer(struct msgb *old_msg, struct gbproxy_bvc *bvc, |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 230 | uint16_t ns_bvci) |
| 231 | { |
| 232 | int rc; |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 233 | struct gbproxy_nse *nse = bvc->nse; |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 234 | OSMO_ASSERT(nse); |
| 235 | |
| 236 | rc = gbprox_relay2nse(old_msg, nse, ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 237 | if (rc < 0) |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 238 | rate_ctr_inc(rate_ctr_group_get_ctr(bvc->ctrg, GBPROX_PEER_CTR_TX_ERR)); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 239 | |
| 240 | return rc; |
| 241 | } |
| 242 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 243 | int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 244 | { |
| 245 | return 0; |
| 246 | } |
| 247 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 248 | |
| 249 | /*********************************************************************** |
| 250 | * PTP BVC handling |
| 251 | ***********************************************************************/ |
| 252 | |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 253 | /* FIXME: Handle the tlli NULL case correctly, |
| 254 | * This function should take a generic selector |
| 255 | * and choose an sgsn based on that |
| 256 | */ |
| 257 | static struct gbproxy_sgsn *gbproxy_select_sgsn(struct gbproxy_config *cfg, const uint32_t *tlli) |
| 258 | { |
| 259 | struct gbproxy_sgsn *sgsn = NULL; |
| 260 | struct gbproxy_sgsn *sgsn_avoid = NULL; |
| 261 | |
| 262 | int tlli_type; |
| 263 | int16_t nri; |
| 264 | bool null_nri = false; |
| 265 | |
| 266 | if (!tlli) { |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 267 | sgsn = gbproxy_sgsn_by_available(cfg); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 268 | if (!sgsn) { |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 269 | LOGP(DGPRS, LOGL_ERROR, "Could not find any available SGSN\n"); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 270 | return NULL; |
| 271 | } |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 272 | LOGPSGSN(sgsn, LOGL_INFO, "Could not get TLLI, using first available SGSN\n"); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 273 | return sgsn; |
| 274 | } |
| 275 | |
| 276 | if (cfg->pool.nri_bitlen == 0) { |
| 277 | /* Pooling is disabled */ |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 278 | sgsn = gbproxy_sgsn_by_available(cfg); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 279 | if (!sgsn) { |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 280 | LOGP(DGPRS, LOGL_ERROR, "Could not find any available SGSN\n"); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 281 | return NULL; |
| 282 | } |
| 283 | |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 284 | LOGPSGSN(sgsn, LOGL_INFO, "Pooling disabled, using first available SGSN\n"); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 285 | } else { |
| 286 | /* Pooling is enabled, try to use the NRI for routing to an SGSN |
| 287 | * See 3GPP TS 23.236 Ch. 5.3.2 */ |
| 288 | tlli_type = gprs_tlli_type(*tlli); |
| 289 | if (tlli_type == TLLI_LOCAL || tlli_type == TLLI_FOREIGN) { |
| 290 | /* Only get/use the NRI if tlli type is local */ |
| 291 | osmo_tmsi_nri_v_get(&nri, *tlli, cfg->pool.nri_bitlen); |
| 292 | if (nri >= 0) { |
| 293 | /* Get the SGSN for the NRI */ |
| 294 | sgsn = gbproxy_sgsn_by_nri(cfg, nri, &null_nri); |
| 295 | if (sgsn && !null_nri) |
| 296 | return sgsn; |
| 297 | /* If the NRI is the null NRI, we need to avoid the chosen SGSN */ |
| 298 | if (null_nri && sgsn) { |
| 299 | sgsn_avoid = sgsn; |
| 300 | } |
| 301 | } else { |
| 302 | /* We couldn't get the NRI from the TLLI */ |
Daniel Willmann | cd21afe | 2021-01-21 18:44:51 +0100 | [diff] [blame] | 303 | LOGP(DGPRS, LOGL_ERROR, "Could not extract NRI from local TLLI %08x\n", *tlli); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 304 | } |
Daniel Willmann | cd21afe | 2021-01-21 18:44:51 +0100 | [diff] [blame] | 305 | } else { |
| 306 | LOGP(DGPRS, LOGL_INFO, "TLLI %08x is neither local nor foreign, not routing by NRI\n", *tlli); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 307 | } |
| 308 | } |
| 309 | |
| 310 | /* If we haven't found an SGSN yet we need to choose one, but avoid the one in sgsn_avoid |
| 311 | * NOTE: This function is not stable if the number of SGSNs or allow_attach changes |
| 312 | * We could implement TLLI tracking here, but 3GPP TS 23.236 Ch. 5.3.2 (see NOTE) argues that |
| 313 | * we can just wait for the MS to reattempt the procedure. |
| 314 | */ |
| 315 | if (!sgsn) |
| 316 | sgsn = gbproxy_sgsn_by_tlli(cfg, sgsn_avoid, *tlli); |
| 317 | |
| 318 | if (!sgsn) { |
| 319 | LOGP(DGPRS, LOGL_ERROR, "No suitable SGSN found for TLLI %u\n", *tlli); |
| 320 | return NULL; |
| 321 | } |
| 322 | |
| 323 | return sgsn; |
| 324 | } |
| 325 | |
| 326 | /*! Find the correct gbproxy_bvc given a cell and an SGSN |
| 327 | * \param[in] cfg The gbproxy configuration |
| 328 | * \param[in] cell The cell the message belongs to |
| 329 | * \param[in] tlli An optional TLLI used for tracking |
| 330 | * \return Returns 0 on success, otherwise a negative value |
| 331 | */ |
| 332 | static struct gbproxy_bvc *gbproxy_select_sgsn_bvc(struct gbproxy_config *cfg, struct gbproxy_cell *cell, const uint32_t *tlli) |
| 333 | { |
| 334 | struct gbproxy_sgsn *sgsn; |
| 335 | struct gbproxy_bvc *sgsn_bvc = NULL; |
Harald Welte | 02d7c48 | 2020-12-30 12:13:36 +0100 | [diff] [blame] | 336 | int i; |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 337 | |
| 338 | sgsn = gbproxy_select_sgsn(cfg, tlli); |
| 339 | if (!sgsn) { |
| 340 | LOGPCELL(cell, LOGL_ERROR, "Could not find any SGSN, dropping message!\n"); |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | /* Get the BVC for this SGSN/NSE */ |
Harald Welte | 02d7c48 | 2020-12-30 12:13:36 +0100 | [diff] [blame] | 345 | for (i = 0; i < ARRAY_SIZE(cell->sgsn_bvc); i++) { |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 346 | sgsn_bvc = cell->sgsn_bvc[i]; |
| 347 | if (!sgsn_bvc) |
| 348 | continue; |
| 349 | if (sgsn->nse != sgsn_bvc->nse) |
| 350 | continue; |
| 351 | |
| 352 | return sgsn_bvc; |
| 353 | } |
| 354 | |
| 355 | /* This shouldn't happen */ |
Daniel Willmann | a648f3c | 2020-12-28 18:07:27 +0100 | [diff] [blame] | 356 | LOGPCELL(cell, LOGL_ERROR, "Could not find matching BVC for SGSN %s, dropping message!\n", sgsn->name); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 357 | return NULL; |
| 358 | } |
| 359 | |
| 360 | /*! Send a message to the next SGSN, possibly ignoring the null SGSN |
| 361 | * route an uplink message on a PTP-BVC to a SGSN using the TLLI |
| 362 | * \param[in] cell The cell the message belongs to |
| 363 | * \param[in] msg The BSSGP message |
| 364 | * \param[in] null_sgsn If not NULL then avoid this SGSN (because this message contains its null NRI) |
| 365 | * \param[in] tlli An optional TLLI used for tracking |
| 366 | * \return Returns 0 on success, otherwise a negative value |
| 367 | */ |
| 368 | static int gbprox_bss2sgsn_tlli(struct gbproxy_cell *cell, struct msgb *msg, const uint32_t *tlli, |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 369 | bool sig_bvci) |
| 370 | { |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 371 | struct gbproxy_config *cfg = cell->cfg; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 372 | struct gbproxy_bvc *sgsn_bvc; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 373 | |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 374 | sgsn_bvc = gbproxy_select_sgsn_bvc(cfg, cell, tlli); |
| 375 | if (!sgsn_bvc) { |
| 376 | LOGPCELL(cell, LOGL_NOTICE, "Could not find any SGSN for TLLI %u, dropping message!\n", *tlli); |
| 377 | return -EINVAL; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 378 | } |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 379 | |
| 380 | return gbprox_relay2peer(msg, sgsn_bvc, sig_bvci ? 0 : sgsn_bvc->bvci); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 381 | } |
| 382 | |
Daniel Willmann | 2231180 | 2021-11-02 11:54:27 +0100 | [diff] [blame] | 383 | static int gbproxy_decode_bssgp(const struct bssgp_normal_hdr *bgph, int msg_len, struct tlv_parsed *tp, const char *log_pfx) |
| 384 | { |
| 385 | int rc; |
| 386 | |
| 387 | /* UNITDATA PDUs have a different header than the other PDUs */ |
| 388 | if (bgph->pdu_type == BSSGP_PDUT_UL_UNITDATA || bgph->pdu_type == BSSGP_PDUT_DL_UNITDATA) { |
| 389 | const struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) bgph; |
| 390 | if (msg_len < sizeof(*budh)) |
Daniel Willmann | f689a8a | 2021-11-18 15:27:37 +0100 | [diff] [blame^] | 391 | return OSMO_TLVP_ERR_MAND_IE_MISSING; |
Daniel Willmann | 2231180 | 2021-11-02 11:54:27 +0100 | [diff] [blame] | 392 | rc = osmo_tlv_prot_parse(&osmo_pdef_bssgp, tp, 1, budh->pdu_type, budh->data, |
| 393 | msg_len - sizeof(*budh), 0, 0, DGPRS, log_pfx); |
| 394 | /* populate TLLI from the fixed headser into the TLV-parsed array so later code |
| 395 | * doesn't have to worry where the TLLI came from */ |
| 396 | tp->lv[BSSGP_IE_TLLI].len = 4; |
| 397 | tp->lv[BSSGP_IE_TLLI].val = (const uint8_t *) &budh->tlli; |
| 398 | } else { |
| 399 | rc = osmo_tlv_prot_parse(&osmo_pdef_bssgp, tp, 1, bgph->pdu_type, bgph->data, |
| 400 | msg_len - sizeof(*bgph), 0, 0, DGPRS, log_pfx); |
| 401 | } |
| 402 | |
| 403 | return rc; |
| 404 | } |
| 405 | |
Daniel Willmann | 5a14837 | 2021-10-29 18:28:13 +0200 | [diff] [blame] | 406 | static int gbproxy_tlli_from_status_pdu(struct tlv_parsed *tp, uint32_t *tlli, char *log_pfx); |
| 407 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 408 | /* Receive an incoming PTP message from a BSS-side NS-VC */ |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 409 | static int gbprox_rx_ptp_from_bss(struct gbproxy_nse *nse, struct msgb *msg, uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 410 | { |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 411 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 412 | const char *pdut_name = osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type); |
| 413 | struct gbproxy_bvc *bss_bvc; |
| 414 | struct tlv_parsed tp; |
| 415 | char log_pfx[32]; |
| 416 | uint32_t tlli; |
| 417 | int rc; |
| 418 | |
| 419 | snprintf(log_pfx, sizeof(log_pfx), "NSE(%05u/BSS)-BVC(%05u/??)", nse->nsei, ns_bvci); |
| 420 | |
| 421 | LOGP(DGPRS, LOGL_DEBUG, "%s Rx %s\n", log_pfx, pdut_name); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 422 | |
Daniel Willmann | 06331ac | 2020-12-10 17:59:46 +0100 | [diff] [blame] | 423 | if (ns_bvci == 0 || ns_bvci == 1) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 424 | LOGP(DGPRS, LOGL_NOTICE, "%s BVCI=%05u is not PTP\n", log_pfx, ns_bvci); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 425 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 426 | } |
| 427 | |
| 428 | if (!(bssgp_pdu_type_flags(bgph->pdu_type) & BSSGP_PDUF_PTP)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 429 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in PTP BVC\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 430 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | if (!(bssgp_pdu_type_flags(bgph->pdu_type) & BSSGP_PDUF_UL)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 434 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in uplink direction\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 435 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 436 | } |
| 437 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 438 | bss_bvc = gbproxy_bvc_by_bvci(nse, ns_bvci); |
| 439 | if (!bss_bvc) { |
| 440 | LOGP(DGPRS, LOGL_NOTICE, "%s %s - Didn't find BVC for PTP message, discarding\n", |
| 441 | log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 442 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKNOWN_BVCI, &ns_bvci, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 443 | } |
| 444 | |
Daniel Willmann | 2231180 | 2021-11-02 11:54:27 +0100 | [diff] [blame] | 445 | rc = gbproxy_decode_bssgp(bgph, msgb_bssgp_len(msg), &tp, log_pfx); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 446 | if (rc < 0) { |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 447 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_PROTO_ERR_BSS)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 448 | return tx_status_from_tlvp(nse, rc, msg); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 449 | } |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 450 | /* hack to get both msg + tlv_parsed passed via osmo_fsm_inst_dispatch */ |
| 451 | msgb_bcid(msg) = (void *)&tp; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 452 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 453 | switch (bgph->pdu_type) { |
| 454 | case BSSGP_PDUT_UL_UNITDATA: |
| 455 | case BSSGP_PDUT_RA_CAPA_UPDATE: |
| 456 | case BSSGP_PDUT_FLOW_CONTROL_MS: |
| 457 | case BSSGP_PDUT_DOWNLOAD_BSS_PFC: |
| 458 | case BSSGP_PDUT_CREATE_BSS_PFC_ACK: |
| 459 | case BSSGP_PDUT_CREATE_BSS_PFC_NACK: |
| 460 | case BSSGP_PDUT_MODIFY_BSS_PFC_ACK: |
| 461 | case BSSGP_PDUT_DELETE_BSS_PFC_ACK: |
| 462 | case BSSGP_PDUT_FLOW_CONTROL_PFC: |
| 463 | case BSSGP_PDUT_DELETE_BSS_PFC_REQ: |
| 464 | case BSSGP_PDUT_PS_HO_REQUIRED: |
| 465 | case BSSGP_PDUT_PS_HO_REQUEST_ACK: |
| 466 | case BSSGP_PDUT_PS_HO_REQUEST_NACK: |
| 467 | case BSSGP_PDUT_PS_HO_COMPLETE: |
| 468 | case BSSGP_PDUT_PS_HO_CANCEL: |
| 469 | /* We can route based on TLLI-NRI */ |
| 470 | tlli = osmo_load32be(TLVP_VAL(&tp, BSSGP_IE_TLLI)); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 471 | rc = gbprox_bss2sgsn_tlli(bss_bvc->cell, msg, &tlli, false); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 472 | break; |
| 473 | case BSSGP_PDUT_RADIO_STATUS: |
| 474 | if (TLVP_PRESENT(&tp, BSSGP_IE_TLLI)) { |
| 475 | tlli = osmo_load32be(TLVP_VAL(&tp, BSSGP_IE_TLLI)); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 476 | rc = gbprox_bss2sgsn_tlli(bss_bvc->cell, msg, &tlli, false); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 477 | } else if (TLVP_PRESENT(&tp, BSSGP_IE_TMSI)) { |
| 478 | /* we treat the TMSI like a TLLI and extract the NRI from it */ |
| 479 | tlli = osmo_load32be(TLVP_VAL(&tp, BSSGP_IE_TMSI)); |
Daniel Willmann | 8b3ed29 | 2021-01-21 18:46:51 +0100 | [diff] [blame] | 480 | /* Convert the TMSI into a FOREIGN TLLI so it is routed appropriately */ |
| 481 | tlli = gprs_tmsi2tlli(tlli, TLLI_FOREIGN); |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 482 | rc = gbprox_bss2sgsn_tlli(bss_bvc->cell, msg, &tlli, false); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 483 | } else if (TLVP_PRESENT(&tp, BSSGP_IE_IMSI)) { |
Daniel Willmann | 5193f22 | 2021-01-11 05:00:46 +0100 | [diff] [blame] | 484 | /* FIXME: Use the IMSI as selector? */ |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 485 | rc = gbprox_bss2sgsn_tlli(bss_bvc->cell, msg, NULL, false); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 486 | } else |
| 487 | LOGPBVC(bss_bvc, LOGL_ERROR, "Rx RADIO-STATUS without any of the conditional IEs\n"); |
| 488 | break; |
| 489 | case BSSGP_PDUT_DUMMY_PAGING_PS_RESP: |
| 490 | case BSSGP_PDUT_PAGING_PS_REJECT: |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 491 | { |
| 492 | /* Route according to IMSI<->NSE cache entry */ |
| 493 | struct osmo_mobile_identity mi; |
| 494 | const uint8_t *mi_data = TLVP_VAL(&tp, BSSGP_IE_IMSI); |
| 495 | uint8_t mi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI); |
| 496 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
Daniel Willmann | 361d0b5 | 2021-07-09 17:44:30 +0200 | [diff] [blame] | 497 | nse = gbproxy_nse_by_imsi(nse->cfg, mi.imsi, CACHE_USAGE_PAGING); |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 498 | if (nse) { |
| 499 | OSMO_ASSERT(nse->sgsn_facing); |
| 500 | rc = gbprox_relay2nse(msg, nse, ns_bvci); |
| 501 | } else { |
Daniel Willmann | 8266918 | 2021-01-19 11:37:55 +0100 | [diff] [blame] | 502 | LOGPBVC(bss_bvc, LOGL_ERROR, "Rx unmatched %s with IMSI %s\n", pdut_name, mi.imsi); |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 503 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 504 | break; |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 505 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 506 | case BSSGP_PDUT_FLOW_CONTROL_BVC: |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 507 | osmo_fsm_inst_dispatch(bss_bvc->fi, BSSGP_BVCFSM_E_RX_FC_BVC, msg); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 508 | break; |
| 509 | case BSSGP_PDUT_STATUS: |
Daniel Willmann | 5a14837 | 2021-10-29 18:28:13 +0200 | [diff] [blame] | 510 | { |
| 511 | struct gbproxy_sgsn *sgsn; |
| 512 | /* Check if the status needs to be terminated locally */ |
| 513 | uint8_t cause = *TLVP_VAL(&tp, BSSGP_IE_CAUSE); |
| 514 | |
| 515 | LOGPNSE(nse, LOGL_NOTICE, "Rx STATUS cause=0x%02x(%s)\n", cause, |
| 516 | bssgp_cause_str(cause)); |
| 517 | |
| 518 | if (gbproxy_tlli_from_status_pdu(&tp, &tlli, log_pfx) == 0) |
| 519 | sgsn = gbproxy_select_sgsn(nse->cfg, &tlli); |
| 520 | else |
| 521 | sgsn = gbproxy_select_sgsn(nse->cfg, NULL); |
| 522 | |
| 523 | if (!sgsn) { |
| 524 | rc = -EINVAL; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 525 | break; |
Daniel Willmann | 5a14837 | 2021-10-29 18:28:13 +0200 | [diff] [blame] | 526 | } |
| 527 | |
| 528 | rc = gbprox_relay2nse(msg, sgsn->nse, ns_bvci); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 529 | break; |
| 530 | } |
Daniel Willmann | 5a14837 | 2021-10-29 18:28:13 +0200 | [diff] [blame] | 531 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 532 | |
| 533 | return 0; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | /* Receive an incoming PTP message from a SGSN-side NS-VC */ |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 537 | static int gbprox_rx_ptp_from_sgsn(struct gbproxy_nse *nse, struct msgb *msg, uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 538 | { |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 539 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 540 | const char *pdut_name = osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type); |
| 541 | struct gbproxy_bvc *sgsn_bvc, *bss_bvc; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 542 | struct tlv_parsed tp; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 543 | char log_pfx[32]; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 544 | int rc; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 545 | |
| 546 | snprintf(log_pfx, sizeof(log_pfx), "NSE(%05u/SGSN)-BVC(%05u/??)", nse->nsei, ns_bvci); |
| 547 | |
| 548 | LOGP(DGPRS, LOGL_DEBUG, "%s Rx %s\n", log_pfx, pdut_name); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 549 | |
Daniel Willmann | 06331ac | 2020-12-10 17:59:46 +0100 | [diff] [blame] | 550 | if (ns_bvci == 0 || ns_bvci == 1) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 551 | LOGP(DGPRS, LOGL_NOTICE, "%s BVCI is not PTP\n", log_pfx); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 552 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | if (!(bssgp_pdu_type_flags(bgph->pdu_type) & BSSGP_PDUF_PTP)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 556 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in PTP BVC\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 557 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 558 | } |
| 559 | |
| 560 | if (!(bssgp_pdu_type_flags(bgph->pdu_type) & BSSGP_PDUF_DL)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 561 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in downlink direction\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 562 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 563 | } |
| 564 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 565 | sgsn_bvc = gbproxy_bvc_by_bvci(nse, ns_bvci); |
| 566 | if (!sgsn_bvc) { |
| 567 | LOGP(DGPRS, LOGL_NOTICE, "%s %s - Didn't find BVC for for PTP message, discarding\n", |
| 568 | log_pfx, pdut_name); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 569 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_INV_BVCI)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 570 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKNOWN_BVCI, &ns_bvci, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 571 | } |
| 572 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 573 | if (!bssgp_bvc_fsm_is_unblocked(sgsn_bvc->fi)) { |
| 574 | LOGPBVC(sgsn_bvc, LOGL_NOTICE, "Rx %s: Dropping on blocked BVC\n", pdut_name); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 575 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn_bvc->ctrg, GBPROX_PEER_CTR_DROPPED)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 576 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_BVCI_BLOCKED, &ns_bvci, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 577 | } |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 578 | |
Daniel Willmann | 2231180 | 2021-11-02 11:54:27 +0100 | [diff] [blame] | 579 | rc = gbproxy_decode_bssgp(bgph, msgb_bssgp_len(msg), &tp, log_pfx); |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 580 | if (rc < 0) { |
Daniel Willmann | cfb6f17 | 2021-11-02 11:55:06 +0100 | [diff] [blame] | 581 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_PROTO_ERR_SGSN)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 582 | return tx_status_from_tlvp(nse, rc, msg); |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 583 | } |
| 584 | /* hack to get both msg + tlv_parsed passed via osmo_fsm_inst_dispatch */ |
| 585 | msgb_bcid(msg) = (void *)&tp; |
| 586 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 587 | OSMO_ASSERT(sgsn_bvc->cell); |
| 588 | bss_bvc = sgsn_bvc->cell->bss_bvc; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 589 | |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 590 | switch (bgph->pdu_type) { |
| 591 | case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
| 592 | return osmo_fsm_inst_dispatch(sgsn_bvc->fi, BSSGP_BVCFSM_E_RX_FC_BVC_ACK, msg); |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 593 | case BSSGP_PDUT_DUMMY_PAGING_PS: |
| 594 | case BSSGP_PDUT_PAGING_PS: |
| 595 | { |
| 596 | /* Cache the IMSI<->NSE to route PAGING REJECT */ |
| 597 | struct osmo_mobile_identity mi; |
| 598 | const uint8_t *mi_data = TLVP_VAL(&tp, BSSGP_IE_IMSI); |
| 599 | uint8_t mi_len = TLVP_LEN(&tp, BSSGP_IE_IMSI); |
| 600 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
Daniel Willmann | 361d0b5 | 2021-07-09 17:44:30 +0200 | [diff] [blame] | 601 | gbproxy_imsi_cache_update(nse, mi.imsi, CACHE_USAGE_PAGING); |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 602 | break; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 603 | } |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 604 | default: |
| 605 | break; |
| 606 | } |
| 607 | return gbprox_relay2peer(msg, bss_bvc, bss_bvc->bvci); |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 608 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 609 | } |
| 610 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 611 | /*********************************************************************** |
| 612 | * BVC FSM call-backs |
| 613 | ***********************************************************************/ |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 614 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 615 | /* helper function to dispatch a FSM event to all SGSN-side BVC FSMs of a cell */ |
| 616 | static void dispatch_to_all_sgsn_bvc(struct gbproxy_cell *cell, uint32_t event, void *priv) |
| 617 | { |
| 618 | unsigned int i; |
| 619 | |
| 620 | for (i = 0; i < ARRAY_SIZE(cell->sgsn_bvc); i++) { |
| 621 | struct gbproxy_bvc *sgsn_bvc = cell->sgsn_bvc[i]; |
| 622 | if (!sgsn_bvc) |
| 623 | continue; |
| 624 | osmo_fsm_inst_dispatch(sgsn_bvc->fi, event, priv); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | /* BVC FSM informs us about a BSS-side reset of the signaling BVC */ |
| 629 | static void bss_sig_bvc_reset_notif(uint16_t nsei, uint16_t bvci, const struct gprs_ra_id *ra_id, |
| 630 | uint16_t cell_id, uint8_t cause, void *priv) |
| 631 | { |
| 632 | struct gbproxy_bvc *sig_bvc = priv; |
| 633 | struct gbproxy_nse *nse = sig_bvc->nse; |
| 634 | struct gbproxy_bvc *ptp_bvc; |
| 635 | unsigned int i; |
| 636 | |
| 637 | /* BLOCK all SGSN-side PTP BVC within this NSE */ |
| 638 | hash_for_each(nse->bvcs, i, ptp_bvc, list) { |
| 639 | if (ptp_bvc == sig_bvc) |
| 640 | continue; |
| 641 | OSMO_ASSERT(ptp_bvc->cell); |
| 642 | |
| 643 | dispatch_to_all_sgsn_bvc(ptp_bvc->cell, BSSGP_BVCFSM_E_REQ_BLOCK, &cause); |
Harald Welte | f9e149b | 2020-12-02 23:29:38 +0100 | [diff] [blame] | 644 | } |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 645 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 646 | /* Delete all BSS-side PTP BVC within this NSE */ |
| 647 | gbproxy_cleanup_bvcs(nse, 0); |
| 648 | |
| 649 | /* TODO: we keep the "CELL" around for now, re-connecting it to |
| 650 | * any (later) new PTP-BVC for that BVCI. Not sure if that's the |
| 651 | * best idea ? */ |
| 652 | } |
| 653 | |
| 654 | /* forward declaration */ |
| 655 | static const struct bssgp_bvc_fsm_ops sgsn_ptp_bvc_fsm_ops; |
| 656 | |
| 657 | static const struct bssgp_bvc_fsm_ops bss_sig_bvc_fsm_ops = { |
| 658 | .reset_notification = bss_sig_bvc_reset_notif, |
| 659 | }; |
| 660 | |
| 661 | /* BVC FSM informs us about a BSS-side reset of a PTP BVC */ |
| 662 | static void bss_ptp_bvc_reset_notif(uint16_t nsei, uint16_t bvci, const struct gprs_ra_id *ra_id, |
| 663 | uint16_t cell_id, uint8_t cause, void *priv) |
| 664 | { |
| 665 | struct gbproxy_bvc *bvc = priv; |
| 666 | struct gbproxy_config *cfg = bvc->nse->cfg; |
Harald Welte | 664c24e | 2020-12-12 15:01:17 +0100 | [diff] [blame] | 667 | struct gbproxy_nse *sgsn_nse; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 668 | unsigned int i; |
| 669 | |
| 670 | OSMO_ASSERT(bvci != 0); |
| 671 | |
| 672 | if (!bvc->cell) { |
| 673 | /* see if we have a CELL dangling around */ |
| 674 | bvc->cell = gbproxy_cell_by_bvci(cfg, bvci); |
| 675 | if (bvc->cell) { |
| 676 | /* the CELL already exists. This means either it * was created before at an |
| 677 | * earlier PTP BVC-RESET, or that there are non-unique BVCIs and hence a |
| 678 | * malconfiguration */ |
| 679 | if (bvc->cell->bss_bvc) { |
| 680 | LOGPBVC(bvc, LOGL_NOTICE, "Rx BVC-RESET via this NSE, but CELL already " |
| 681 | "has BVC on NSEI=%05u\n", bvc->cell->bss_bvc->nse->nsei); |
| 682 | LOGPBVC(bvc->cell->bss_bvc, LOGL_NOTICE, "Destroying due to conflicting " |
| 683 | "BVCI configuration (new NSEI=%05u)!\n", bvc->nse->nsei); |
| 684 | gbproxy_bvc_free(bvc->cell->bss_bvc); |
| 685 | } |
| 686 | bvc->cell->bss_bvc = bvc; |
| 687 | } |
| 688 | } |
| 689 | |
| 690 | if (!bvc->cell) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 691 | /* if we end up here, it means this is the first time we received a BVC-RESET |
| 692 | * for this BVC. We need to create the 'cell' data structure and the SGSN-side |
| 693 | * BVC counterparts */ |
| 694 | |
Philipp Maier | e4597ec | 2021-02-09 16:02:00 +0100 | [diff] [blame] | 695 | bvc->cell = gbproxy_cell_alloc(cfg, bvci, ra_id, cell_id); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 696 | OSMO_ASSERT(bvc->cell); |
| 697 | |
| 698 | /* link us to the cell and vice-versa */ |
| 699 | bvc->cell->bss_bvc = bvc; |
Harald Welte | 664c24e | 2020-12-12 15:01:17 +0100 | [diff] [blame] | 700 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 701 | |
Daniel Willmann | 6701d27 | 2021-04-08 08:39:12 +0200 | [diff] [blame] | 702 | /* Ensure we have the correct RA/CELL ID */ |
| 703 | if (!gsm48_ra_equal(&bvc->cell->id.raid, ra_id)) { |
| 704 | LOGPBVC(bvc, LOGL_NOTICE, "RAID changed from %s to %s, updating cell\n", osmo_rai_name(&bvc->cell->id.raid), osmo_rai_name(ra_id)); |
| 705 | memcpy(&bvc->cell->id.raid, ra_id, sizeof(*ra_id)); |
| 706 | } |
| 707 | if (bvc->cell->id.cid != cell_id) { |
| 708 | LOGPBVC(bvc, LOGL_NOTICE, "CellID changed from %05d to %05d, updating cell\n", bvc->cell->id.cid, cell_id); |
| 709 | bvc->cell->id.cid = cell_id; |
| 710 | } |
| 711 | |
| 712 | /* Reallocate SGSN-side BVCs of the cell, and reset them |
Daniel Willmann | f9902c5 | 2021-11-12 15:52:03 +0100 | [diff] [blame] | 713 | * Removing and reallocating is needed because the ra_id/cell_id might have changed */ |
Harald Welte | 664c24e | 2020-12-12 15:01:17 +0100 | [diff] [blame] | 714 | hash_for_each(cfg->sgsn_nses, i, sgsn_nse, list) { |
| 715 | struct gbproxy_bvc *sgsn_bvc = gbproxy_bvc_by_bvci(sgsn_nse, bvci); |
Daniel Willmann | dc763fd | 2021-09-24 16:45:38 +0200 | [diff] [blame] | 716 | if (!sgsn_bvc) |
| 717 | sgsn_bvc = gbproxy_bvc_by_bvci_inactive(sgsn_nse, bvci); |
Harald Welte | 664c24e | 2020-12-12 15:01:17 +0100 | [diff] [blame] | 718 | if (sgsn_bvc) |
Daniel Willmann | 6701d27 | 2021-04-08 08:39:12 +0200 | [diff] [blame] | 719 | gbproxy_bvc_free(sgsn_bvc); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 720 | |
Daniel Willmann | 6701d27 | 2021-04-08 08:39:12 +0200 | [diff] [blame] | 721 | sgsn_bvc = gbproxy_bvc_alloc(sgsn_nse, bvci); |
| 722 | OSMO_ASSERT(sgsn_bvc); |
| 723 | sgsn_bvc->cell = bvc->cell; |
Daniel Willmann | 6701d27 | 2021-04-08 08:39:12 +0200 | [diff] [blame] | 724 | sgsn_bvc->fi = bssgp_bvc_fsm_alloc_ptp_bss(sgsn_bvc, cfg->nsi, sgsn_nse->nsei, |
| 725 | bvci, ra_id, cell_id); |
| 726 | OSMO_ASSERT(sgsn_bvc->fi); |
| 727 | bssgp_bvc_fsm_set_max_pdu_len(sgsn_bvc->fi, sgsn_nse->max_sdu_len); |
| 728 | bssgp_bvc_fsm_set_ops(sgsn_bvc->fi, &sgsn_ptp_bvc_fsm_ops, sgsn_bvc); |
| 729 | gbproxy_cell_add_sgsn_bvc(bvc->cell, sgsn_bvc); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 730 | } |
| 731 | |
| 732 | /* Trigger outbound BVC-RESET procedure toward each SGSN */ |
| 733 | dispatch_to_all_sgsn_bvc(bvc->cell, BSSGP_BVCFSM_E_REQ_RESET, &cause); |
| 734 | } |
| 735 | |
| 736 | /* BVC FSM informs us about a BSS-side FSM state change */ |
| 737 | static void bss_ptp_bvc_state_chg_notif(uint16_t nsei, uint16_t bvci, int old_state, int state, void *priv) |
| 738 | { |
| 739 | struct gbproxy_bvc *bvc = priv; |
| 740 | struct gbproxy_cell *cell = bvc->cell; |
| 741 | uint8_t cause = bssgp_bvc_fsm_get_block_cause(bvc->fi); |
| 742 | |
| 743 | /* we have just been created but due to callback ordering the cell is not associated */ |
| 744 | if (!cell) |
| 745 | return; |
| 746 | |
| 747 | switch (state) { |
| 748 | case BSSGP_BVCFSM_S_BLOCKED: |
| 749 | /* block the corresponding SGSN-side PTP BVCs */ |
| 750 | dispatch_to_all_sgsn_bvc(cell, BSSGP_BVCFSM_E_REQ_BLOCK, &cause); |
| 751 | break; |
| 752 | case BSSGP_BVCFSM_S_UNBLOCKED: |
| 753 | /* unblock the corresponding SGSN-side PTP BVCs */ |
| 754 | dispatch_to_all_sgsn_bvc(cell, BSSGP_BVCFSM_E_REQ_UNBLOCK, NULL); |
| 755 | break; |
| 756 | } |
| 757 | } |
| 758 | |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 759 | /* BVC FSM informs us about BVC-FC PDU receive */ |
| 760 | static void bss_ptp_bvc_fc_bvc(uint16_t nsei, uint16_t bvci, const struct bssgp2_flow_ctrl *fc, void *priv) |
| 761 | { |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 762 | struct bssgp2_flow_ctrl fc_reduced; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 763 | struct gbproxy_bvc *bss_bvc = priv; |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 764 | struct gbproxy_cell *cell; |
| 765 | struct gbproxy_config *cfg; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 766 | |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 767 | OSMO_ASSERT(bss_bvc); |
| 768 | OSMO_ASSERT(fc); |
| 769 | |
| 770 | cell = bss_bvc->cell; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 771 | if (!cell) |
| 772 | return; |
| 773 | |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 774 | cfg = cell->cfg; |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 775 | |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 776 | /* reduce / scale according to configuration to make sure we only advertise a fraction |
| 777 | * of the capacity to each of the SGSNs in the pool */ |
| 778 | fc_reduced = *fc; |
| 779 | fc_reduced.bucket_size_max = (fc->bucket_size_max * cfg->pool.bvc_fc_ratio) / 100; |
| 780 | fc_reduced.bucket_leak_rate = (fc->bucket_leak_rate * cfg->pool.bvc_fc_ratio) / 100; |
| 781 | /* we don't modify the per-MS related values as any single MS is only served by one SGSN */ |
| 782 | |
| 783 | dispatch_to_all_sgsn_bvc(cell, BSSGP_BVCFSM_E_REQ_FC_BVC, (void *) &fc_reduced); |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 784 | } |
| 785 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 786 | static const struct bssgp_bvc_fsm_ops bss_ptp_bvc_fsm_ops = { |
| 787 | .reset_notification = bss_ptp_bvc_reset_notif, |
| 788 | .state_chg_notification = bss_ptp_bvc_state_chg_notif, |
Harald Welte | 85a4027 | 2020-12-08 21:43:22 +0100 | [diff] [blame] | 789 | .rx_fc_bvc = bss_ptp_bvc_fc_bvc, |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 790 | }; |
| 791 | |
| 792 | /* BVC FSM informs us about a SGSN-side reset of a PTP BVC */ |
| 793 | static void sgsn_ptp_bvc_reset_notif(uint16_t nsei, uint16_t bvci, const struct gprs_ra_id *ra_id, |
| 794 | uint16_t cell_id, uint8_t cause, void *priv) |
| 795 | { |
| 796 | struct gbproxy_bvc *bvc = priv; |
| 797 | |
| 798 | if (!bvc->cell) { |
| 799 | LOGPBVC(bvc, LOGL_ERROR, "RESET of PTP BVC on SGSN side for which we have no BSS?\n"); |
| 800 | return; |
| 801 | } |
| 802 | |
| 803 | OSMO_ASSERT(bvc->cell->bss_bvc); |
| 804 | |
| 805 | /* request reset of BSS-facing PTP-BVC */ |
| 806 | osmo_fsm_inst_dispatch(bvc->cell->bss_bvc->fi, BSSGP_BVCFSM_E_REQ_RESET, &cause); |
| 807 | } |
| 808 | |
| 809 | static const struct bssgp_bvc_fsm_ops sgsn_ptp_bvc_fsm_ops = { |
| 810 | .reset_notification = sgsn_ptp_bvc_reset_notif, |
| 811 | }; |
| 812 | |
| 813 | /* BVC FSM informs us about a SGSN-side reset of the signaling BVC */ |
| 814 | static void sgsn_sig_bvc_reset_notif(uint16_t nsei, uint16_t bvci, const struct gprs_ra_id *ra_id, |
| 815 | uint16_t cell_id, uint8_t cause, void *priv) |
| 816 | { |
| 817 | struct gbproxy_bvc *bvc = priv; |
| 818 | struct gbproxy_config *cfg = bvc->nse->cfg; |
| 819 | struct gbproxy_nse *bss_nse; |
| 820 | unsigned int i; |
| 821 | |
| 822 | /* delete all SGSN-side PTP BVC for this SGSN */ |
| 823 | gbproxy_cleanup_bvcs(bvc->nse, 0); |
| 824 | /* FIXME: what to do about the cells? */ |
| 825 | /* FIXME: do we really want to RESET all signaling BVC on the BSS and affect all other SGSN? */ |
| 826 | |
| 827 | /* we need to trigger generating a reset procedure towards each BSS side signaling BVC */ |
| 828 | hash_for_each(cfg->bss_nses, i, bss_nse, list) { |
| 829 | struct gbproxy_bvc *bss_bvc = gbproxy_bvc_by_bvci(bss_nse, 0); |
| 830 | if (!bss_bvc) { |
| 831 | LOGPNSE(bss_nse, LOGL_ERROR, "Doesn't have BVC with BVCI=0 ?!?\n"); |
| 832 | continue; |
| 833 | } |
| 834 | osmo_fsm_inst_dispatch(bss_bvc->fi, BSSGP_BVCFSM_E_REQ_RESET, &cause); |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | const struct bssgp_bvc_fsm_ops sgsn_sig_bvc_fsm_ops = { |
| 839 | .reset_notification = sgsn_sig_bvc_reset_notif, |
| 840 | }; |
| 841 | |
| 842 | /*********************************************************************** |
| 843 | * Signaling BVC handling |
| 844 | ***********************************************************************/ |
| 845 | |
| 846 | /* process a BVC-RESET message from the BSS side */ |
| 847 | static int rx_bvc_reset_from_bss(struct gbproxy_nse *nse, struct msgb *msg, struct tlv_parsed *tp) |
| 848 | { |
| 849 | struct gbproxy_bvc *from_bvc = NULL; |
| 850 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 851 | uint32_t features = 0; // FIXME: make configurable |
| 852 | |
| 853 | LOGPNSE(nse, LOGL_INFO, "Rx BVC-RESET (BVCI=%05u)\n", bvci); |
| 854 | |
Harald Welte | 314647b | 2020-12-02 23:03:22 +0100 | [diff] [blame] | 855 | if (bvci == 0) { |
| 856 | /* If we receive a BVC reset on the signalling endpoint, we |
| 857 | * don't want the SGSN to reset, as the signalling endpoint |
| 858 | * is common for all point-to-point BVCs (and thus all BTS) */ |
Harald Welte | 324f065 | 2020-12-02 23:06:37 +0100 | [diff] [blame] | 859 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 860 | from_bvc = gbproxy_bvc_by_bvci(nse, 0); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 861 | if (!from_bvc) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 862 | from_bvc = gbproxy_bvc_alloc(nse, 0); |
| 863 | OSMO_ASSERT(from_bvc); |
| 864 | from_bvc->fi = bssgp_bvc_fsm_alloc_sig_sgsn(from_bvc, nse->cfg->nsi, nse->nsei, features); |
| 865 | if (!from_bvc->fi) { |
| 866 | LOGPNSE(nse, LOGL_ERROR, "Cannot allocate SIG-BVC FSM\n"); |
| 867 | gbproxy_bvc_free(from_bvc); |
| 868 | return -ENOMEM; |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 869 | } |
Daniel Willmann | a8b6165 | 2021-02-12 05:05:14 +0100 | [diff] [blame] | 870 | bssgp_bvc_fsm_set_max_pdu_len(from_bvc->fi, nse->max_sdu_len); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 871 | bssgp_bvc_fsm_set_ops(from_bvc->fi, &bss_sig_bvc_fsm_ops, from_bvc); |
| 872 | } |
| 873 | } else { |
| 874 | from_bvc = gbproxy_bvc_by_bvci(nse, bvci); |
| 875 | if (!from_bvc) { |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 876 | /* if a PTP-BVC is reset, and we don't know that |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 877 | * PTP-BVCI yet, we should allocate a new bvc */ |
| 878 | from_bvc = gbproxy_bvc_alloc(nse, bvci); |
| 879 | OSMO_ASSERT(from_bvc); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 880 | from_bvc->fi = bssgp_bvc_fsm_alloc_ptp_sgsn(from_bvc, nse->cfg->nsi, |
| 881 | nse->nsei, bvci); |
| 882 | if (!from_bvc->fi) { |
| 883 | LOGPNSE(nse, LOGL_ERROR, "Cannot allocate SIG-BVC FSM\n"); |
| 884 | gbproxy_bvc_free(from_bvc); |
| 885 | return -ENOMEM; |
| 886 | } |
Daniel Willmann | a8b6165 | 2021-02-12 05:05:14 +0100 | [diff] [blame] | 887 | bssgp_bvc_fsm_set_max_pdu_len(from_bvc->fi, nse->max_sdu_len); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 888 | bssgp_bvc_fsm_set_ops(from_bvc->fi, &bss_ptp_bvc_fsm_ops, from_bvc); |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 889 | } |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 890 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 891 | /* hand into FSM for further processing */ |
| 892 | osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_RESET, msg); |
| 893 | return 0; |
Harald Welte | 7df1e5a | 2020-12-02 22:53:26 +0100 | [diff] [blame] | 894 | } |
| 895 | |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 896 | /* Receive an incoming RIM message from a BSS-side NS-VC */ |
| 897 | static int gbprox_rx_rim_from_bss(struct tlv_parsed *tp, struct gbproxy_nse *nse, struct msgb *msg, char *log_pfx, |
| 898 | const char *pdut_name) |
| 899 | { |
| 900 | struct gbproxy_sgsn *sgsn; |
| 901 | struct gbproxy_cell *dest_cell; |
| 902 | struct gbproxy_cell *src_cell; |
| 903 | struct bssgp_rim_routing_info dest_ri; |
| 904 | struct bssgp_rim_routing_info src_ri; |
| 905 | int rc; |
Philipp Maier | 4499cf4 | 2021-02-10 17:54:44 +0100 | [diff] [blame] | 906 | char ri_src_str[64]; |
| 907 | char ri_dest_str[64]; |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 908 | uint16_t ns_bvci = msgb_bvci(msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 909 | |
| 910 | rc = bssgp_parse_rim_ri(&dest_ri, TLVP_VAL(&tp[0], BSSGP_IE_RIM_ROUTING_INFO), |
| 911 | TLVP_LEN(&tp[0], BSSGP_IE_RIM_ROUTING_INFO)); |
| 912 | if (rc < 0) { |
| 913 | LOGP(DGPRS, LOGL_ERROR, "%s %s cannot parse destination RIM routing info\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 914 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 915 | } |
| 916 | rc = bssgp_parse_rim_ri(&src_ri, TLVP_VAL(&tp[1], BSSGP_IE_RIM_ROUTING_INFO), |
| 917 | TLVP_LEN(&tp[1], BSSGP_IE_RIM_ROUTING_INFO)); |
| 918 | if (rc < 0) { |
| 919 | LOGP(DGPRS, LOGL_ERROR, "%s %s cannot parse source RIM routing info\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 920 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 921 | } |
| 922 | |
| 923 | /* Since gbproxy is 2G only we do not expect to get RIM messages only from GERAN cells. */ |
| 924 | if (src_ri.discr != BSSGP_RIM_ROUTING_INFO_GERAN) { |
| 925 | LOGP(DGPRS, LOGL_ERROR, "%s %s source RIM routing info is not GERAN (%s)\n", log_pfx, pdut_name, |
| 926 | bssgp_rim_ri_name(&src_ri)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 927 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 928 | } |
| 929 | |
| 930 | /* Lookup source cell to make sure that the source RIM routing information actually belongs |
| 931 | * to a valid cell that we know */ |
| 932 | src_cell = gbproxy_cell_by_cellid(nse->cfg, &src_ri.geran.raid, src_ri.geran.cid); |
| 933 | if (!src_cell) { |
| 934 | LOGP(DGPRS, LOGL_NOTICE, "%s %s cannot find cell for source RIM routing info (%s)\n", log_pfx, |
| 935 | pdut_name, bssgp_rim_ri_name(&src_ri)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 936 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | /* TODO: Use bssgp_bvc_get_features_negotiated(src_cell->bss_bvc->fi) to check if the the BSS sided BVC actually |
| 940 | * did negotiate RIM support. If not we should respond with a BSSGP STATUS message. The cause code should be |
| 941 | * BSSGP_CAUSE_PDU_INCOMP_FEAT. */ |
| 942 | |
| 943 | /* If Destination is known by gbproxy, route directly */ |
| 944 | if (dest_ri.discr == BSSGP_RIM_ROUTING_INFO_GERAN) { |
| 945 | dest_cell = gbproxy_cell_by_cellid(nse->cfg, &dest_ri.geran.raid, dest_ri.geran.cid); |
| 946 | if (dest_cell) { |
| 947 | /* TODO: Also check if dest_cell->bss_bvc is RIM-capable (see also above). If not we should |
| 948 | * respond with a BSSGP STATUS message as well because it also would make no sense to try |
| 949 | * routing the RIM message to the next RIM-capable SGSN. */ |
Philipp Maier | 4499cf4 | 2021-02-10 17:54:44 +0100 | [diff] [blame] | 950 | LOGP(DLBSSGP, LOGL_DEBUG, "%s %s relaying to peer (nsei=%u) RIM-PDU: src=%s, dest=%s\n", |
| 951 | log_pfx, pdut_name, dest_cell->bss_bvc->nse->nsei, |
| 952 | bssgp_rim_ri_name_buf(ri_src_str, sizeof(ri_src_str), &src_ri), |
| 953 | bssgp_rim_ri_name_buf(ri_dest_str, sizeof(ri_dest_str), &dest_ri)); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 954 | return gbprox_relay2peer(msg, dest_cell->bss_bvc, 0); |
| 955 | } |
| 956 | } |
| 957 | |
| 958 | /* Otherwise pass on to a RIM-capable SGSN */ |
| 959 | /* TODO: We need to extend gbproxy_select_sgsn() so that it selects a RIM-capable SGSN, at the moment we just |
| 960 | * get any SGSN and just assume that it is RIM-capable. */ |
| 961 | sgsn = gbproxy_select_sgsn(nse->cfg, NULL); |
| 962 | if (!sgsn) { |
| 963 | LOGP(DGPRS, LOGL_NOTICE, |
| 964 | "%s %s cannot route RIM message (%s to %s) since no RIM capable SGSN is found!\n", log_pfx, |
| 965 | pdut_name, bssgp_rim_ri_name(&src_ri), bssgp_rim_ri_name(&dest_ri)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 966 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 967 | } |
Philipp Maier | 4499cf4 | 2021-02-10 17:54:44 +0100 | [diff] [blame] | 968 | LOGP(DLBSSGP, LOGL_DEBUG, "%s %s relaying to SGSN(%05u/%s) RIM-PDU: src=%s, dest=%s\n", |
| 969 | log_pfx, pdut_name, sgsn->nse->nsei, sgsn->name, |
| 970 | bssgp_rim_ri_name_buf(ri_src_str, sizeof(ri_src_str), &src_ri), |
| 971 | bssgp_rim_ri_name_buf(ri_dest_str, sizeof(ri_dest_str), &dest_ri)); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 972 | |
| 973 | return gbprox_relay2nse(msg, sgsn->nse, 0); |
| 974 | } |
| 975 | |
Daniel Willmann | 6ec5f95 | 2021-10-28 16:13:03 +0200 | [diff] [blame] | 976 | /* Extract the TLLI from the PDU-in-error of the STATUS PDU (if available) */ |
| 977 | static int gbproxy_tlli_from_status_pdu(struct tlv_parsed *tp, uint32_t *tlli, char *log_pfx) |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 978 | { |
| 979 | int rc; |
| 980 | int pdu_len = TLVP_LEN(&tp[0], BSSGP_IE_PDU_IN_ERROR); |
| 981 | const uint8_t *pdu_data = TLVP_VAL(&tp[0], BSSGP_IE_PDU_IN_ERROR); |
| 982 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *)pdu_data; |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 983 | struct tlv_parsed tp_inner; |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 984 | |
Daniel Willmann | c5dcebd | 2021-09-30 16:57:51 +0200 | [diff] [blame] | 985 | /* TODO: Parse partial messages as well */ |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 986 | rc = gbproxy_decode_bssgp(bgph, pdu_len, &tp_inner, log_pfx); |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 987 | if (rc < 0) |
| 988 | return rc; |
| 989 | |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 990 | if (TLVP_PRESENT(&tp_inner, BSSGP_IE_TLLI)) { |
| 991 | *tlli = osmo_load32be(TLVP_VAL(&tp_inner, BSSGP_IE_TLLI)); |
| 992 | } else if (TLVP_PRESENT(&tp_inner, BSSGP_IE_TMSI)) { |
Daniel Willmann | cbfc7cf | 2021-09-29 11:51:56 +0200 | [diff] [blame] | 993 | /* we treat the TMSI like a TLLI and extract the NRI from it */ |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 994 | *tlli = osmo_load32be(TLVP_VAL(&tp_inner, BSSGP_IE_TMSI)); |
Daniel Willmann | cbfc7cf | 2021-09-29 11:51:56 +0200 | [diff] [blame] | 995 | /* Convert the TMSI into a FOREIGN TLLI so it is routed appropriately */ |
| 996 | *tlli = gprs_tmsi2tlli(*tlli, TLLI_FOREIGN); |
| 997 | } else { |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 998 | return -ENOENT; |
Daniel Willmann | cbfc7cf | 2021-09-29 11:51:56 +0200 | [diff] [blame] | 999 | } |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1000 | |
| 1001 | return 0; |
| 1002 | } |
| 1003 | |
Daniel Willmann | 3d8f599 | 2021-10-27 16:05:37 +0200 | [diff] [blame] | 1004 | /* Extract the BVCI from the PDU-in-error of the STATUS PDU (if available) */ |
| 1005 | static int gbproxy_bvci_from_status_pdu(struct tlv_parsed *tp, uint16_t *bvci, char *log_pfx) |
| 1006 | { |
| 1007 | int rc; |
| 1008 | int pdu_len = TLVP_LEN(&tp[0], BSSGP_IE_PDU_IN_ERROR); |
| 1009 | const uint8_t *pdu_data = TLVP_VAL(&tp[0], BSSGP_IE_PDU_IN_ERROR); |
| 1010 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *)pdu_data; |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 1011 | struct tlv_parsed tp_inner; |
Daniel Willmann | 3d8f599 | 2021-10-27 16:05:37 +0200 | [diff] [blame] | 1012 | |
| 1013 | /* TODO: Parse partial messages as well */ |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 1014 | rc = gbproxy_decode_bssgp(bgph, pdu_len, &tp_inner, log_pfx); |
Daniel Willmann | 3d8f599 | 2021-10-27 16:05:37 +0200 | [diff] [blame] | 1015 | if (rc < 0) |
| 1016 | return rc; |
| 1017 | |
Daniel Willmann | 0141628 | 2021-11-02 11:55:57 +0100 | [diff] [blame] | 1018 | if (TLVP_PRESENT(&tp_inner, BSSGP_IE_BVCI)) |
| 1019 | *bvci = ntohs(tlvp_val16_unal(&tp_inner, BSSGP_IE_BVCI)); |
Daniel Willmann | 3d8f599 | 2021-10-27 16:05:37 +0200 | [diff] [blame] | 1020 | else |
| 1021 | return -ENOENT; |
| 1022 | |
| 1023 | return 0; |
| 1024 | } |
| 1025 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1026 | /* Receive an incoming signalling message from a BSS-side NS-VC */ |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1027 | static int gbprox_rx_sig_from_bss(struct gbproxy_nse *nse, struct msgb *msg, uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1028 | { |
| 1029 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1030 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1031 | const char *pdut_name = osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type); |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1032 | struct tlv_parsed tp[2]; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1033 | int data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1034 | struct gbproxy_bvc *from_bvc = NULL; |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1035 | char log_pfx[32]; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1036 | uint16_t ptp_bvci; |
| 1037 | uint32_t tlli; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1038 | int rc; |
| 1039 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1040 | snprintf(log_pfx, sizeof(log_pfx), "NSE(%05u/BSS)-BVC(%05u/??)", nse->nsei, ns_bvci); |
| 1041 | |
| 1042 | LOGP(DGPRS, LOGL_DEBUG, "%s Rx %s\n", log_pfx, pdut_name); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1043 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1044 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1045 | LOGP(DGPRS, LOGL_NOTICE, "%s %s BVCI=%05u is not signalling\n", log_pfx, pdut_name, ns_bvci); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1046 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1047 | } |
| 1048 | |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 1049 | if (!(bssgp_pdu_type_flags(pdu_type) & BSSGP_PDUF_SIG)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1050 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in signalling BVC\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1051 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 1052 | } |
| 1053 | |
| 1054 | if (!(bssgp_pdu_type_flags(pdu_type) & BSSGP_PDUF_UL)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1055 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in uplink direction\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1056 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1057 | } |
| 1058 | |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1059 | rc = osmo_tlv_prot_parse(&osmo_pdef_bssgp, tp, ARRAY_SIZE(tp), pdu_type, bgph->data, data_len, 0, 0, |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1060 | DGPRS, log_pfx); |
| 1061 | if (rc < 0) { |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1062 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_PROTO_ERR_BSS)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1063 | return tx_status_from_tlvp(nse, rc, msg); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1064 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1065 | /* hack to get both msg + tlv_parsed passed via osmo_fsm_inst_dispatch */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1066 | msgb_bcid(msg) = (void *)tp; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1067 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1068 | /* special case handling for some PDU types */ |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1069 | switch (pdu_type) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1070 | case BSSGP_PDUT_BVC_RESET: |
| 1071 | /* resolve or create gbproxy_bvc + handlei n BVC-FSM */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1072 | return rx_bvc_reset_from_bss(nse, msg, &tp[0]); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1073 | case BSSGP_PDUT_BVC_RESET_ACK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1074 | ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1075 | from_bvc = gbproxy_bvc_by_bvci(nse, ptp_bvci); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1076 | if (!from_bvc) |
| 1077 | goto err_no_bvc; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1078 | return osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_RESET_ACK, msg); |
| 1079 | case BSSGP_PDUT_BVC_BLOCK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1080 | ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1081 | from_bvc = gbproxy_bvc_by_bvci(nse, ptp_bvci); |
| 1082 | if (!from_bvc) |
| 1083 | goto err_no_bvc; |
| 1084 | return osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_BLOCK, msg); |
| 1085 | case BSSGP_PDUT_BVC_UNBLOCK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1086 | ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1087 | from_bvc = gbproxy_bvc_by_bvci(nse, ptp_bvci); |
| 1088 | if (!from_bvc) |
| 1089 | goto err_no_bvc; |
| 1090 | return osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_UNBLOCK, msg); |
| 1091 | case BSSGP_PDUT_SUSPEND: |
| 1092 | case BSSGP_PDUT_RESUME: |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1093 | { |
| 1094 | struct gbproxy_sgsn *sgsn; |
| 1095 | |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1096 | tlli = osmo_load32be(TLVP_VAL(&tp[0], BSSGP_IE_TLLI)); |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1097 | sgsn = gbproxy_select_sgsn(nse->cfg, &tlli); |
| 1098 | if (!sgsn) { |
| 1099 | LOGP(DGPRS, LOGL_ERROR, "Could not find any SGSN for TLLI, dropping message!\n"); |
| 1100 | rc = -EINVAL; |
| 1101 | break; |
| 1102 | } |
| 1103 | |
| 1104 | gbproxy_tlli_cache_update(nse, tlli); |
| 1105 | |
| 1106 | rc = gbprox_relay2nse(msg, sgsn->nse, 0); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1107 | #if 0 |
| 1108 | /* TODO: Validate the RAI for consistency with the RAI |
| 1109 | * we expect for any of the BVC within this BSS side NSE */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1110 | memcpy(ra, TLVP_VAL(&tp[0], BSSGP_IE_ROUTEING_AREA), sizeof(from_bvc->ra)); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1111 | gsm48_parse_ra(&raid, from_bvc->ra); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1112 | #endif |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1113 | break; |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1114 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1115 | case BSSGP_PDUT_STATUS: |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1116 | { |
| 1117 | struct gbproxy_sgsn *sgsn; |
| 1118 | /* Check if the status needs to be terminated locally */ |
| 1119 | uint8_t cause = *TLVP_VAL(&tp[0], BSSGP_IE_CAUSE); |
Daniel Willmann | c5dcebd | 2021-09-30 16:57:51 +0200 | [diff] [blame] | 1120 | |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1121 | if (cause == BSSGP_CAUSE_UNKNOWN_BVCI || cause == BSSGP_CAUSE_BVCI_BLOCKED) { |
| 1122 | /* Log and handle locally */ |
| 1123 | ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Daniel Willmann | c5dcebd | 2021-09-30 16:57:51 +0200 | [diff] [blame] | 1124 | LOGPNSE(nse, LOGL_ERROR, "Rx STATUS cause=0x%02x(%s) for PtP-BVC %05u\n", cause, |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1125 | bssgp_cause_str(cause), ptp_bvci); |
| 1126 | /* FIXME: Remove/block our BVC if present? */ |
| 1127 | break; |
| 1128 | } |
| 1129 | |
Daniel Willmann | c5dcebd | 2021-09-30 16:57:51 +0200 | [diff] [blame] | 1130 | LOGPNSE(nse, LOGL_NOTICE, "Rx STATUS cause=0x%02x(%s) ", cause, |
| 1131 | bssgp_cause_str(cause)); |
| 1132 | |
Daniel Willmann | 6ec5f95 | 2021-10-28 16:13:03 +0200 | [diff] [blame] | 1133 | if (gbproxy_tlli_from_status_pdu(tp, &tlli, log_pfx) == 0) |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1134 | sgsn = gbproxy_select_sgsn(nse->cfg, &tlli); |
| 1135 | else |
| 1136 | sgsn = gbproxy_select_sgsn(nse->cfg, NULL); |
| 1137 | |
| 1138 | if (!sgsn) { |
| 1139 | rc = -EINVAL; |
| 1140 | break; |
| 1141 | } |
| 1142 | |
| 1143 | rc = gbprox_relay2nse(msg, sgsn->nse, 0); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1144 | break; |
Daniel Willmann | 7d37cbb | 2021-09-29 11:51:51 +0200 | [diff] [blame] | 1145 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1146 | case BSSGP_PDUT_RAN_INFO: |
| 1147 | case BSSGP_PDUT_RAN_INFO_REQ: |
| 1148 | case BSSGP_PDUT_RAN_INFO_ACK: |
| 1149 | case BSSGP_PDUT_RAN_INFO_ERROR: |
| 1150 | case BSSGP_PDUT_RAN_INFO_APP_ERROR: |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1151 | rc = gbprox_rx_rim_from_bss(tp, nse, msg, log_pfx, pdut_name); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1152 | break; |
| 1153 | case BSSGP_PDUT_LLC_DISCARD: |
| 1154 | case BSSGP_PDUT_FLUSH_LL_ACK: |
| 1155 | /* route based on BVCI + TLLI */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1156 | ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
| 1157 | tlli = osmo_load32be(TLVP_VAL(&tp[0], BSSGP_IE_TLLI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1158 | from_bvc = gbproxy_bvc_by_bvci(nse, ptp_bvci); |
| 1159 | if (!from_bvc) |
| 1160 | goto err_no_bvc; |
Daniel Willmann | d4ab1f9 | 2020-12-21 18:53:55 +0100 | [diff] [blame] | 1161 | gbprox_bss2sgsn_tlli(from_bvc->cell, msg, &tlli, true); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1162 | break; |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1163 | case BSSGP_PDUT_PAGING_PS_REJECT: |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1164 | case BSSGP_PDUT_DUMMY_PAGING_PS_RESP: |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1165 | { |
| 1166 | /* Route according to IMSI<->NSE cache entry */ |
| 1167 | struct osmo_mobile_identity mi; |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1168 | const uint8_t *mi_data = TLVP_VAL(&tp[0], BSSGP_IE_IMSI); |
| 1169 | uint8_t mi_len = TLVP_LEN(&tp[0], BSSGP_IE_IMSI); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1170 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
Daniel Willmann | 361d0b5 | 2021-07-09 17:44:30 +0200 | [diff] [blame] | 1171 | nse = gbproxy_nse_by_imsi(nse->cfg, mi.imsi, CACHE_USAGE_PAGING); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1172 | if (!nse) { |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1173 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1174 | } |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1175 | OSMO_ASSERT(nse->sgsn_facing); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1176 | rc = gbprox_relay2nse(msg, nse, 0); |
| 1177 | break; |
| 1178 | } |
Daniel Willmann | f024eeb | 2021-07-06 14:02:41 +0200 | [diff] [blame] | 1179 | case BSSGP_PDUT_MS_REGISTR_ENQ: |
| 1180 | { |
| 1181 | struct gbproxy_sgsn *sgsn; |
| 1182 | struct osmo_mobile_identity mi; |
| 1183 | const uint8_t *mi_data = TLVP_VAL(&tp[0], BSSGP_IE_IMSI); |
| 1184 | uint8_t mi_len = TLVP_LEN(&tp[0], BSSGP_IE_IMSI); |
| 1185 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
| 1186 | |
| 1187 | sgsn = gbproxy_select_sgsn(nse->cfg, NULL); |
| 1188 | if (!sgsn) { |
| 1189 | LOGP(DGPRS, LOGL_ERROR, "Could not find any SGSN, dropping message!\n"); |
| 1190 | rc = -EINVAL; |
| 1191 | break; |
| 1192 | } |
| 1193 | |
| 1194 | gbproxy_imsi_cache_update(nse, mi.imsi, CACHE_USAGE_MS_REG_ENQ); |
| 1195 | |
| 1196 | rc = gbprox_relay2nse(msg, sgsn->nse, 0); |
| 1197 | break; |
| 1198 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1199 | default: |
| 1200 | LOGPNSE(nse, LOGL_ERROR, "Rx %s: Implementation missing\n", pdut_name); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1201 | break; |
| 1202 | } |
| 1203 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1204 | return rc; |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1205 | err_no_bvc: |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1206 | LOGPNSE(nse, LOGL_ERROR, "Rx %s: cannot find BVC for BVCI=%05u\n", pdut_name, ptp_bvci); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1207 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_INV_NSEI)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1208 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1209 | } |
| 1210 | |
| 1211 | /* Receive paging request from SGSN, we need to relay to proper BSS */ |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1212 | static int gbprox_rx_paging(struct gbproxy_nse *sgsn_nse, struct msgb *msg, const char *pdut_name, |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1213 | struct tlv_parsed *tp, uint16_t ns_bvci, bool broadcast) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1214 | { |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1215 | struct gbproxy_config *cfg = sgsn_nse->cfg; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1216 | struct gbproxy_bvc *sgsn_bvc, *bss_bvc; |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1217 | struct gbproxy_nse *nse; |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1218 | unsigned int n_nses = 0; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1219 | int errctr = GBPROX_GLOB_CTR_PROTO_ERR_SGSN; |
Harald Welte | 8b4c794 | 2020-12-05 10:14:49 +0100 | [diff] [blame] | 1220 | int i, j; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1221 | |
Harald Welte | 173a182 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1222 | if (TLVP_PRES_LEN(tp, BSSGP_IE_BVCI, 2)) { |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1223 | uint16_t bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1224 | errctr = GBPROX_GLOB_CTR_OTHER_ERR; |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1225 | sgsn_bvc = gbproxy_bvc_by_bvci(sgsn_nse, bvci); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1226 | if (!sgsn_bvc) { |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1227 | LOGPNSE(sgsn_nse, LOGL_NOTICE, "Rx %s: unable to route: BVCI=%05u unknown\n", |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1228 | pdut_name, bvci); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1229 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, errctr)); |
Harald Welte | 3d1bd4d | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1230 | return -EINVAL; |
| 1231 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1232 | LOGPBVC(sgsn_bvc, LOGL_INFO, "Rx %s: routing by BVCI\n", pdut_name); |
| 1233 | return gbprox_relay2peer(msg, sgsn_bvc->cell->bss_bvc, ns_bvci); |
Harald Welte | 173a182 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1234 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_ROUTEING_AREA, 6)) { |
Philipp Maier | da3af94 | 2021-02-04 21:54:09 +0100 | [diff] [blame] | 1235 | struct gprs_ra_id raid; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1236 | errctr = GBPROX_GLOB_CTR_INV_RAI; |
Philipp Maier | da3af94 | 2021-02-04 21:54:09 +0100 | [diff] [blame] | 1237 | gsm48_parse_ra(&raid, TLVP_VAL(tp, BSSGP_IE_ROUTEING_AREA)); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1238 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1239 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1240 | hash_for_each(nse->bvcs, j, bss_bvc, list) { |
Daniel Willmann | f9902c5 | 2021-11-12 15:52:03 +0100 | [diff] [blame] | 1241 | /* Skip BVCs without a cell (e.g. signalling) */ |
| 1242 | if (!bss_bvc->cell) |
| 1243 | continue; |
| 1244 | |
| 1245 | if (gsm48_ra_equal(&bss_bvc->cell->id.raid, &raid)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1246 | LOGPNSE(nse, LOGL_INFO, "Rx %s: routing to NSE (RAI match)\n", |
| 1247 | pdut_name); |
| 1248 | gbprox_relay2peer(msg, bss_bvc, ns_bvci); |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1249 | n_nses++; |
| 1250 | /* Only send it once to each NSE */ |
| 1251 | break; |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1252 | } |
Harald Welte | 3d1bd4d | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1253 | } |
| 1254 | } |
Harald Welte | 173a182 | 2020-12-03 15:36:59 +0100 | [diff] [blame] | 1255 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_LOCATION_AREA, 5)) { |
Philipp Maier | da3af94 | 2021-02-04 21:54:09 +0100 | [diff] [blame] | 1256 | struct gsm48_ra_id lac; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1257 | errctr = GBPROX_GLOB_CTR_INV_LAI; |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1258 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1259 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1260 | hash_for_each(nse->bvcs, j, bss_bvc, list) { |
Daniel Willmann | f9902c5 | 2021-11-12 15:52:03 +0100 | [diff] [blame] | 1261 | /* Skip BVCs without a cell (e.g. signalling) */ |
| 1262 | if (!bss_bvc->cell) |
| 1263 | continue; |
| 1264 | |
| 1265 | gsm48_encode_ra(&lac, &bss_bvc->cell->id.raid); |
Philipp Maier | da3af94 | 2021-02-04 21:54:09 +0100 | [diff] [blame] | 1266 | if (!memcmp(&lac, TLVP_VAL(tp, BSSGP_IE_LOCATION_AREA), 5)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1267 | LOGPNSE(nse, LOGL_INFO, "Rx %s: routing to NSE (LAI match)\n", |
| 1268 | pdut_name); |
| 1269 | gbprox_relay2peer(msg, bss_bvc, ns_bvci); |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1270 | n_nses++; |
| 1271 | /* Only send it once to each NSE */ |
| 1272 | break; |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1273 | } |
Harald Welte | 3d1bd4d | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1274 | } |
| 1275 | } |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1276 | } else if (TLVP_PRES_LEN(tp, BSSGP_IE_BSS_AREA_ID, 1) || broadcast) { |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1277 | /* iterate over all bvcs and dispatch the paging to each matching one */ |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1278 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1279 | hash_for_each(nse->bvcs, j, bss_bvc, list) { |
| 1280 | LOGPNSE(nse, LOGL_INFO, "Rx %s:routing to NSE (broadcast)\n", pdut_name); |
| 1281 | gbprox_relay2peer(msg, bss_bvc, ns_bvci); |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1282 | n_nses++; |
| 1283 | /* Only send it once to each NSE */ |
| 1284 | break; |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1285 | } |
Harald Welte | 53ee206 | 2020-11-24 11:31:13 +0100 | [diff] [blame] | 1286 | } |
| 1287 | } else { |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1288 | LOGPNSE(sgsn_nse, LOGL_ERROR, "BSSGP PAGING: unable to route, missing IE\n"); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1289 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, errctr)); |
Harald Welte | 53ee206 | 2020-11-24 11:31:13 +0100 | [diff] [blame] | 1290 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1291 | |
Daniel Willmann | 7620571 | 2020-11-30 17:08:58 +0100 | [diff] [blame] | 1292 | if (n_nses == 0) { |
Harald Welte | df690e8 | 2020-12-12 15:58:28 +0100 | [diff] [blame] | 1293 | LOGPNSE(sgsn_nse, LOGL_ERROR, "BSSGP PAGING: unable to route, no destination found\n"); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1294 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, errctr)); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1295 | return -EINVAL; |
| 1296 | } |
Harald Welte | 3d1bd4d | 2020-11-23 15:14:20 +0100 | [diff] [blame] | 1297 | return 0; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1298 | } |
| 1299 | |
| 1300 | /* Receive an incoming BVC-RESET message from the SGSN */ |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1301 | static int rx_bvc_reset_from_sgsn(struct gbproxy_nse *nse, struct msgb *msg, struct tlv_parsed *tp, |
| 1302 | uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1303 | { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1304 | uint16_t ptp_bvci = ntohs(tlvp_val16_unal(tp, BSSGP_IE_BVCI)); |
| 1305 | struct gbproxy_bvc *from_bvc; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1306 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1307 | LOGPNSE(nse, LOGL_INFO, "Rx BVC-RESET (BVCI=%05u)\n", ptp_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1308 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1309 | if (ptp_bvci == 0) { |
| 1310 | from_bvc = gbproxy_bvc_by_bvci(nse, 0); |
| 1311 | OSMO_ASSERT(from_bvc); |
| 1312 | osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_RESET, msg); |
| 1313 | } else { |
| 1314 | from_bvc = gbproxy_bvc_by_bvci(nse, ptp_bvci); |
| 1315 | if (!from_bvc) { |
| 1316 | LOGPNSE(nse, LOGL_ERROR, "Rx BVC-RESET BVCI=%05u: Cannot find BVC\n", ptp_bvci); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1317 | rate_ctr_inc(rate_ctr_group_get_ctr(nse->cfg->ctrg, GBPROX_GLOB_CTR_INV_BVCI)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1318 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKNOWN_BVCI, &ptp_bvci, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1319 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1320 | osmo_fsm_inst_dispatch(from_bvc->fi, BSSGP_BVCFSM_E_RX_RESET, msg); |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1321 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1322 | |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1326 | /* Receive an incoming RIM message from the SGSN-side NS-VC */ |
| 1327 | static int gbprox_rx_rim_from_sgsn(struct tlv_parsed *tp, struct gbproxy_nse *nse, struct msgb *msg, char *log_pfx, |
| 1328 | const char *pdut_name) |
| 1329 | { |
| 1330 | struct gbproxy_sgsn *sgsn; |
| 1331 | struct gbproxy_cell *dest_cell; |
| 1332 | struct bssgp_rim_routing_info dest_ri; |
| 1333 | struct bssgp_rim_routing_info src_ri; |
| 1334 | int rc; |
Philipp Maier | 4499cf4 | 2021-02-10 17:54:44 +0100 | [diff] [blame] | 1335 | char ri_src_str[64]; |
| 1336 | char ri_dest_str[64]; |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1337 | uint16_t ns_bvci = msgb_bvci(msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1338 | |
| 1339 | /* TODO: Reply with STATUS if BSSGP didn't negotiate RIM feature, see also comments in |
| 1340 | gbprox_rx_rim_from_bss() */ |
| 1341 | |
| 1342 | rc = bssgp_parse_rim_ri(&dest_ri, TLVP_VAL(&tp[0], BSSGP_IE_RIM_ROUTING_INFO), |
| 1343 | TLVP_LEN(&tp[0], BSSGP_IE_RIM_ROUTING_INFO)); |
| 1344 | if (rc < 0) { |
| 1345 | LOGP(DGPRS, LOGL_ERROR, "%s %s cannot parse destination RIM routing info\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1346 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1347 | } |
| 1348 | rc = bssgp_parse_rim_ri(&src_ri, TLVP_VAL(&tp[1], BSSGP_IE_RIM_ROUTING_INFO), |
| 1349 | TLVP_LEN(&tp[1], BSSGP_IE_RIM_ROUTING_INFO)); |
| 1350 | if (rc < 0) { |
| 1351 | LOGP(DGPRS, LOGL_ERROR, "%s %s cannot parse source RIM routing info\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1352 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1353 | } |
| 1354 | |
| 1355 | /* Since gbproxy is 2G only we do not expect to get RIM messages that target non-GERAN cells. */ |
| 1356 | if (dest_ri.discr != BSSGP_RIM_ROUTING_INFO_GERAN) { |
| 1357 | LOGP(DGPRS, LOGL_ERROR, "%s %s destination RIM routing info is not GERAN (%s)\n", log_pfx, pdut_name, |
| 1358 | bssgp_rim_ri_name(&dest_ri)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1359 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1360 | } |
| 1361 | |
| 1362 | /* Lookup destination cell */ |
| 1363 | dest_cell = gbproxy_cell_by_cellid(nse->cfg, &dest_ri.geran.raid, dest_ri.geran.cid); |
| 1364 | if (!dest_cell) { |
| 1365 | LOGP(DGPRS, LOGL_NOTICE, "%s %s cannot find cell for destination RIM routing info (%s)\n", log_pfx, |
| 1366 | pdut_name, bssgp_rim_ri_name(&dest_ri)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1367 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1368 | } |
| 1369 | |
| 1370 | /* TODO: Check if the BVC of the destination cell actually did negotiate RIM support, see also comments |
| 1371 | * in gbprox_rx_rim_from_bss() */ |
| 1372 | sgsn = gbproxy_sgsn_by_nsei(nse->cfg, nse->nsei); |
| 1373 | OSMO_ASSERT(sgsn); |
| 1374 | |
Philipp Maier | 4499cf4 | 2021-02-10 17:54:44 +0100 | [diff] [blame] | 1375 | LOGP(DLBSSGP, LOGL_DEBUG, "%s %s relaying from SGSN(%05u/%s) RIM-PDU: src=%s, dest=%s\n", |
| 1376 | log_pfx, pdut_name, sgsn->nse->nsei, sgsn->name, |
| 1377 | bssgp_rim_ri_name_buf(ri_src_str, sizeof(ri_src_str), &src_ri), |
| 1378 | bssgp_rim_ri_name_buf(ri_dest_str, sizeof(ri_dest_str), &dest_ri)); |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1379 | |
| 1380 | return gbprox_relay2peer(msg, dest_cell->bss_bvc, 0); |
| 1381 | } |
| 1382 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1383 | /* Receive an incoming signalling message from the SGSN-side NS-VC */ |
Harald Welte | dbef0aa | 2020-12-07 17:48:11 +0100 | [diff] [blame] | 1384 | static int gbprox_rx_sig_from_sgsn(struct gbproxy_nse *nse, struct msgb *msg, uint16_t ns_bvci) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1385 | { |
Harald Welte | dbef0aa | 2020-12-07 17:48:11 +0100 | [diff] [blame] | 1386 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msgb_bssgph(msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1387 | uint8_t pdu_type = bgph->pdu_type; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1388 | const char *pdut_name = osmo_tlv_prot_msg_name(&osmo_pdef_bssgp, bgph->pdu_type); |
| 1389 | struct gbproxy_config *cfg = nse->cfg; |
| 1390 | struct gbproxy_bvc *sgsn_bvc; |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1391 | struct tlv_parsed tp[2]; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1392 | int data_len; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1393 | uint16_t bvci; |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1394 | char log_pfx[32]; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1395 | int rc = 0; |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1396 | int i; |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1397 | bool paging_bc = false; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1398 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1399 | snprintf(log_pfx, sizeof(log_pfx), "NSE(%05u/SGSN)-BVC(%05u/??)", nse->nsei, ns_bvci); |
| 1400 | |
| 1401 | LOGP(DGPRS, LOGL_DEBUG, "%s Rx %s\n", log_pfx, pdut_name); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1402 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1403 | if (ns_bvci != 0 && ns_bvci != 1) { |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1404 | LOGP(DGPRS, LOGL_NOTICE, "%s BVCI=%05u is not signalling\n", log_pfx, ns_bvci); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1405 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1406 | } |
| 1407 | |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 1408 | if (!(bssgp_pdu_type_flags(pdu_type) & BSSGP_PDUF_SIG)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1409 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in signalling BVC\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1410 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Harald Welte | 278dd27 | 2020-12-06 13:35:24 +0100 | [diff] [blame] | 1411 | } |
| 1412 | |
| 1413 | if (!(bssgp_pdu_type_flags(pdu_type) & BSSGP_PDUF_DL)) { |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1414 | LOGP(DGPRS, LOGL_NOTICE, "%s %s not allowed in downlink direction\n", log_pfx, pdut_name); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1415 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1416 | } |
| 1417 | |
Harald Welte | dbef0aa | 2020-12-07 17:48:11 +0100 | [diff] [blame] | 1418 | data_len = msgb_bssgp_len(msg) - sizeof(*bgph); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1419 | |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1420 | rc = osmo_tlv_prot_parse(&osmo_pdef_bssgp, tp, ARRAY_SIZE(tp), pdu_type, bgph->data, data_len, 0, 0, |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1421 | DGPRS, log_pfx); |
| 1422 | if (rc < 0) { |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1423 | rc = tx_status_from_tlvp(nse, rc, msg); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1424 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, GBPROX_GLOB_CTR_PROTO_ERR_SGSN)); |
Harald Welte | ec0f801 | 2020-12-06 16:32:01 +0100 | [diff] [blame] | 1425 | return rc; |
| 1426 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1427 | /* hack to get both msg + tlv_parsed passed via osmo_fsm_inst_dispatch */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1428 | msgb_bcid(msg) = (void *)tp; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1429 | |
| 1430 | switch (pdu_type) { |
| 1431 | case BSSGP_PDUT_BVC_RESET: |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1432 | /* resolve or create ggbproxy_bvc + handle in BVC-FSM */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1433 | bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
| 1434 | rc = rx_bvc_reset_from_sgsn(nse, msg, &tp[0], ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1435 | break; |
| 1436 | case BSSGP_PDUT_BVC_RESET_ACK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1437 | bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1438 | sgsn_bvc = gbproxy_bvc_by_bvci(nse, bvci); |
| 1439 | if (!sgsn_bvc) |
| 1440 | goto err_no_bvc; |
| 1441 | rc = osmo_fsm_inst_dispatch(sgsn_bvc->fi, BSSGP_BVCFSM_E_RX_RESET_ACK, msg); |
| 1442 | break; |
| 1443 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1444 | bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1445 | sgsn_bvc = gbproxy_bvc_by_bvci(nse, bvci); |
Daniel Willmann | dc763fd | 2021-09-24 16:45:38 +0200 | [diff] [blame] | 1446 | if (!sgsn_bvc) { |
| 1447 | /* Check if BVC was blocked before */ |
| 1448 | sgsn_bvc = gbproxy_bvc_by_bvci_inactive(nse, bvci); |
| 1449 | if (!sgsn_bvc) |
| 1450 | goto err_no_bvc; |
| 1451 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1452 | rc = osmo_fsm_inst_dispatch(sgsn_bvc->fi, BSSGP_BVCFSM_E_RX_BLOCK_ACK, msg); |
| 1453 | break; |
| 1454 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1455 | bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1456 | sgsn_bvc = gbproxy_bvc_by_bvci(nse, bvci); |
| 1457 | if (!sgsn_bvc) |
| 1458 | goto err_no_bvc; |
| 1459 | rc = osmo_fsm_inst_dispatch(sgsn_bvc->fi, BSSGP_BVCFSM_E_RX_UNBLOCK_ACK, msg); |
Daniel Willmann | 8489e7a | 2020-11-03 21:12:42 +0100 | [diff] [blame] | 1460 | break; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1461 | case BSSGP_PDUT_FLUSH_LL: |
| 1462 | /* simple case: BVCI IE is mandatory */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1463 | bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1464 | sgsn_bvc = gbproxy_bvc_by_bvci(nse, bvci); |
| 1465 | if (!sgsn_bvc) |
| 1466 | goto err_no_bvc; |
| 1467 | if (sgsn_bvc->cell && sgsn_bvc->cell->bss_bvc) |
| 1468 | rc = gbprox_relay2peer(msg, sgsn_bvc->cell->bss_bvc, ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1469 | break; |
Daniel Willmann | 5614e57 | 2021-01-18 18:38:27 +0100 | [diff] [blame] | 1470 | case BSSGP_PDUT_DUMMY_PAGING_PS: |
| 1471 | /* Routing area is optional in dummy paging and we have nothing else to go by |
| 1472 | * so in case it is missing we need to broadcast the paging */ |
| 1473 | paging_bc = true; |
| 1474 | /* fall through */ |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1475 | case BSSGP_PDUT_PAGING_PS: |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1476 | { |
| 1477 | /* Cache the IMSI<->NSE to route PAGING REJECT */ |
| 1478 | struct osmo_mobile_identity mi; |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1479 | const uint8_t *mi_data = TLVP_VAL(&tp[0], BSSGP_IE_IMSI); |
| 1480 | uint8_t mi_len = TLVP_LEN(&tp[0], BSSGP_IE_IMSI); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1481 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
Daniel Willmann | 361d0b5 | 2021-07-09 17:44:30 +0200 | [diff] [blame] | 1482 | gbproxy_imsi_cache_update(nse, mi.imsi, CACHE_USAGE_PAGING); |
Daniel Willmann | 8613c9d | 2021-01-17 13:40:38 +0100 | [diff] [blame] | 1483 | /* fall through */ |
| 1484 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1485 | case BSSGP_PDUT_PAGING_CS: |
| 1486 | /* process the paging request (LAI/RAI lookup) */ |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1487 | rc = gbprox_rx_paging(nse, msg, pdut_name, &tp[0], ns_bvci, paging_bc); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1488 | break; |
| 1489 | case BSSGP_PDUT_STATUS: |
Daniel Willmann | 885f430 | 2021-09-30 16:58:46 +0200 | [diff] [blame] | 1490 | { |
| 1491 | struct gbproxy_nse *nse_peer; |
| 1492 | uint32_t tlli; |
| 1493 | |
| 1494 | /* Check if the status needs to be terminated locally */ |
| 1495 | uint8_t cause = *TLVP_VAL(&tp[0], BSSGP_IE_CAUSE); |
| 1496 | |
| 1497 | if (cause == BSSGP_CAUSE_UNKNOWN_BVCI || cause == BSSGP_CAUSE_BVCI_BLOCKED) { |
| 1498 | /* Log and handle locally, BVCI should be present for these causes */ |
| 1499 | if (!TLVP_PRESENT(&tp[0], BSSGP_IE_BVCI)) { |
| 1500 | LOGPNSE(nse, LOGL_ERROR, "Rx STATUS cause=0x%02x(%s), but BVCI is missing\n", cause, |
| 1501 | bssgp_cause_str(cause)); |
| 1502 | break; |
| 1503 | } |
| 1504 | uint16_t ptp_bvci = ntohs(tlvp_val16_unal(&tp[0], BSSGP_IE_BVCI)); |
| 1505 | LOGPNSE(nse, LOGL_ERROR, "Rx STATUS cause=0x%02x(%s) for PtP-BVC %05u\n", cause, |
| 1506 | bssgp_cause_str(cause), ptp_bvci); |
| 1507 | /* FIXME: Remove/block the other BSS/SGSN BVCs if present? */ |
| 1508 | break; |
| 1509 | } |
| 1510 | |
| 1511 | LOGPNSE(nse, LOGL_NOTICE, "Rx STATUS cause=0x%02x(%s)\n", cause, |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1512 | bssgp_cause_str(cause)); |
Daniel Willmann | 885f430 | 2021-09-30 16:58:46 +0200 | [diff] [blame] | 1513 | |
Daniel Willmann | 3d8f599 | 2021-10-27 16:05:37 +0200 | [diff] [blame] | 1514 | |
| 1515 | if (gbproxy_bvci_from_status_pdu(tp, &bvci, log_pfx) == 0 && bvci != 0) { |
| 1516 | struct gbproxy_cell *cell = gbproxy_cell_by_bvci(cfg, bvci); |
| 1517 | |
| 1518 | if ((!cell || !cell->bss_bvc || !cell->bss_bvc->nse)) { |
| 1519 | LOGPNSE(nse, LOGL_ERROR, "Rx STATUS cause=0x%02x(%s), but can't find NSE for cell\n", |
| 1520 | cause, bssgp_cause_str(cause)); |
| 1521 | break; |
| 1522 | } |
| 1523 | |
| 1524 | return gbprox_relay2nse(msg, cell->bss_bvc->nse, 0); |
| 1525 | } |
| 1526 | |
Daniel Willmann | 6ec5f95 | 2021-10-28 16:13:03 +0200 | [diff] [blame] | 1527 | /* We can only forward this TLLI if it's in the cache (which only happens on suspend/resume) */ |
| 1528 | if (gbproxy_tlli_from_status_pdu(tp, &tlli, log_pfx) == 0) { |
Daniel Willmann | 885f430 | 2021-09-30 16:58:46 +0200 | [diff] [blame] | 1529 | nse_peer = gbproxy_nse_by_tlli(cfg, tlli); |
| 1530 | if (nse_peer) |
| 1531 | return gbprox_relay2nse(msg, nse_peer, 0); |
| 1532 | } |
| 1533 | |
| 1534 | LOGPNSE(nse, LOGL_ERROR, "Unable to handle STATUS cause=0x%02x(%s)\n", cause, |
| 1535 | bssgp_cause_str(cause)); |
| 1536 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1537 | break; |
Daniel Willmann | 885f430 | 2021-09-30 16:58:46 +0200 | [diff] [blame] | 1538 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1539 | /* those only exist in the SGSN -> BSS direction */ |
| 1540 | case BSSGP_PDUT_SUSPEND_ACK: |
| 1541 | case BSSGP_PDUT_SUSPEND_NACK: |
| 1542 | case BSSGP_PDUT_RESUME_ACK: |
| 1543 | case BSSGP_PDUT_RESUME_NACK: |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1544 | { |
| 1545 | struct gbproxy_nse *nse_peer; |
Philipp Maier | 74882dc | 2021-02-04 16:31:46 +0100 | [diff] [blame] | 1546 | uint32_t tlli = osmo_load32be(TLVP_VAL(&tp[0], BSSGP_IE_TLLI)); |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1547 | |
| 1548 | nse_peer = gbproxy_nse_by_tlli(cfg, tlli); |
| 1549 | if (!nse_peer) { |
| 1550 | LOGPNSE(nse, LOGL_ERROR, "Rx %s: Cannot find NSE\n", pdut_name); |
| 1551 | /* TODO: Counter */ |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1552 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1553 | } |
| 1554 | /* Delete the entry after we're done */ |
| 1555 | gbproxy_tlli_cache_remove(cfg, tlli); |
| 1556 | LOGPNSE(nse_peer, LOGL_DEBUG, "Rx %s: forwarding\n", pdut_name); |
| 1557 | gbprox_relay2nse(msg, nse_peer, ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1558 | break; |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1559 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1560 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
Harald Welte | 7479c4d | 2020-12-02 20:06:04 +0100 | [diff] [blame] | 1561 | case BSSGP_PDUT_OVERLOAD: |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1562 | LOGPNSE(nse, LOGL_DEBUG, "Rx %s: broadcasting\n", pdut_name); |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1563 | /* broadcast to all BSS-side bvcs */ |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1564 | hash_for_each(cfg->bss_nses, i, nse, list) { |
Harald Welte | 7479c4d | 2020-12-02 20:06:04 +0100 | [diff] [blame] | 1565 | gbprox_relay2nse(msg, nse, 0); |
| 1566 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1567 | break; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1568 | case BSSGP_PDUT_RAN_INFO: |
| 1569 | case BSSGP_PDUT_RAN_INFO_REQ: |
| 1570 | case BSSGP_PDUT_RAN_INFO_ACK: |
| 1571 | case BSSGP_PDUT_RAN_INFO_ERROR: |
| 1572 | case BSSGP_PDUT_RAN_INFO_APP_ERROR: |
Philipp Maier | 1c5766b | 2021-02-09 17:03:03 +0100 | [diff] [blame] | 1573 | rc = gbprox_rx_rim_from_sgsn(tp, nse, msg, log_pfx, pdut_name); |
Pau Espin Pedrol | a429634 | 2021-05-07 13:33:34 +0200 | [diff] [blame] | 1574 | break; |
Daniel Willmann | f024eeb | 2021-07-06 14:02:41 +0200 | [diff] [blame] | 1575 | case BSSGP_PDUT_MS_REGISTR_ENQ_RESP: |
| 1576 | { |
| 1577 | struct gbproxy_nse *nse_peer; |
| 1578 | struct osmo_mobile_identity mi; |
| 1579 | const uint8_t *mi_data = TLVP_VAL(&tp[0], BSSGP_IE_IMSI); |
| 1580 | uint8_t mi_len = TLVP_LEN(&tp[0], BSSGP_IE_IMSI); |
| 1581 | osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
| 1582 | nse_peer = gbproxy_nse_by_imsi(cfg, mi.imsi, CACHE_USAGE_MS_REG_ENQ); |
| 1583 | if (!nse_peer) { |
| 1584 | LOGPNSE(nse, LOGL_ERROR, "Rx %s: Cannot find NSE\n", pdut_name); |
| 1585 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
| 1586 | } else if (nse_peer->sgsn_facing) { |
| 1587 | LOGPNSE(nse, LOGL_ERROR, "Forwarding %s failed: IMSI cache contains SGSN NSE", pdut_name); |
| 1588 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
| 1589 | } |
| 1590 | gbproxy_imsi_cache_remove(cfg, mi.imsi, CACHE_USAGE_MS_REG_ENQ); |
| 1591 | gbprox_relay2nse(msg, nse_peer, ns_bvci); |
| 1592 | break; |
| 1593 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1594 | default: |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1595 | LOGPNSE(nse, LOGL_NOTICE, "Rx %s: Not supported\n", pdut_name); |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1596 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, GBPROX_GLOB_CTR_PROTO_ERR_SGSN)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1597 | rc = tx_status(nse, ns_bvci, BSSGP_CAUSE_PROTO_ERR_UNSPEC, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1598 | break; |
| 1599 | } |
| 1600 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1601 | return rc; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1602 | |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1603 | err_no_bvc: |
Daniel Willmann | 723bb36 | 2021-09-28 18:51:47 +0200 | [diff] [blame] | 1604 | LOGPNSE(nse, LOGL_ERROR, "Rx %s: Cannot find BVC %05u\n", pdut_name, bvci); |
Daniel Willmann | c4b913b | 2021-09-24 16:43:42 +0200 | [diff] [blame] | 1605 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, GBPROX_GLOB_CTR_INV_BVCI)); |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1606 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_INV_MAND_INF, NULL, msg); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1607 | } |
| 1608 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1609 | |
| 1610 | /*********************************************************************** |
| 1611 | * libosmogb NS/BSSGP integration |
| 1612 | ***********************************************************************/ |
| 1613 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1614 | int gbprox_bssgp_send_cb(void *ctx, struct msgb *msg) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1615 | { |
| 1616 | int rc; |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1617 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
| 1618 | struct gprs_ns2_inst *nsi = cfg->nsi; |
| 1619 | struct osmo_gprs_ns2_prim nsp = {}; |
| 1620 | |
| 1621 | nsp.bvci = msgb_bvci(msg); |
| 1622 | nsp.nsei = msgb_nsei(msg); |
| 1623 | |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1624 | osmo_prim_init(&nsp.oph, SAP_NS, GPRS_NS2_PRIM_UNIT_DATA, PRIM_OP_REQUEST, msg); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1625 | rc = gprs_ns2_recv_prim(nsi, &nsp.oph); |
| 1626 | |
| 1627 | return rc; |
| 1628 | } |
| 1629 | |
| 1630 | /* Main input function for Gb proxy */ |
| 1631 | int gbprox_rcvmsg(void *ctx, struct msgb *msg) |
| 1632 | { |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1633 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1634 | uint16_t ns_bvci = msgb_bvci(msg); |
| 1635 | uint16_t nsei = msgb_nsei(msg); |
| 1636 | struct gbproxy_nse *nse; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1637 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1638 | nse = gbproxy_nse_by_nsei(cfg, nsei, NSE_F_SGSN); |
| 1639 | if (nse) { |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1640 | /* ensure minimum length to decode PDU type */ |
| 1641 | if (msgb_bssgp_len(msg) < sizeof(struct bssgp_normal_hdr)) |
| 1642 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_SEM_INCORR_PDU, NULL, msg); |
| 1643 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1644 | if (ns_bvci == 0 || ns_bvci == 1) |
| 1645 | return gbprox_rx_sig_from_sgsn(nse, msg, ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1646 | else |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1647 | return gbprox_rx_ptp_from_sgsn(nse, msg, ns_bvci); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1648 | } |
| 1649 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1650 | nse = gbproxy_nse_by_nsei(cfg, nsei, NSE_F_BSS); |
| 1651 | if (!nse) { |
| 1652 | LOGP(DGPRS, LOGL_NOTICE, "NSE(%05u/BSS) not known -> allocating\n", nsei); |
| 1653 | nse = gbproxy_nse_alloc(cfg, nsei, false); |
| 1654 | } |
| 1655 | if (nse) { |
Daniel Willmann | f8cba65 | 2021-02-12 04:59:47 +0100 | [diff] [blame] | 1656 | /* ensure minimum length to decode PDU type */ |
| 1657 | if (msgb_bssgp_len(msg) < sizeof(struct bssgp_normal_hdr)) |
| 1658 | return tx_status(nse, ns_bvci, BSSGP_CAUSE_SEM_INCORR_PDU, NULL, msg); |
| 1659 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1660 | if (ns_bvci == 0 || ns_bvci == 1) |
| 1661 | return gbprox_rx_sig_from_bss(nse, msg, ns_bvci); |
| 1662 | else |
| 1663 | return gbprox_rx_ptp_from_bss(nse, msg, ns_bvci); |
| 1664 | } |
| 1665 | |
| 1666 | return 0; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1667 | } |
| 1668 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1669 | /* TODO: What about handling: |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1670 | * GPRS_NS2_AFF_CAUSE_VC_FAILURE, |
| 1671 | GPRS_NS2_AFF_CAUSE_VC_RECOVERY, |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1672 | osmocom own causes |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1673 | GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED, |
| 1674 | GPRS_NS2_AFF_CAUSE_SNS_FAILURE, |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1675 | */ |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1676 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1677 | void gprs_ns_prim_status_cb(struct gbproxy_config *cfg, struct osmo_gprs_ns2_prim *nsp) |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1678 | { |
Daniel Willmann | 1f3470f | 2021-03-11 09:53:42 +0100 | [diff] [blame] | 1679 | int i; |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1680 | struct gbproxy_bvc *bvc; |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1681 | struct gbproxy_nse *nse; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1682 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1683 | switch (nsp->u.status.cause) { |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1684 | case GPRS_NS2_AFF_CAUSE_SNS_FAILURE: |
| 1685 | case GPRS_NS2_AFF_CAUSE_SNS_CONFIGURED: |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1686 | break; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1687 | |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1688 | case GPRS_NS2_AFF_CAUSE_RECOVERY: |
Harald Welte | 9b367d2 | 2021-01-18 13:55:51 +0100 | [diff] [blame] | 1689 | LOGP(DGPRS, LOGL_NOTICE, "NS-NSE %d became available\n", nsp->nsei); |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1690 | nse = gbproxy_nse_by_nsei(cfg, nsp->nsei, NSE_F_SGSN); |
| 1691 | if (nse) { |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 1692 | nse->alive = true; |
Daniel Willmann | 38b9c9a | 2021-03-09 15:54:44 +0100 | [diff] [blame] | 1693 | // Update the NSE max SDU len |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1694 | nse->max_sdu_len = nsp->u.status.mtu; |
Daniel Willmann | 38b9c9a | 2021-03-09 15:54:44 +0100 | [diff] [blame] | 1695 | |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1696 | uint8_t cause = BSSGP_CAUSE_OML_INTERV; |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1697 | bvc = gbproxy_bvc_by_bvci(nse, 0); |
Daniel Willmann | 38b9c9a | 2021-03-09 15:54:44 +0100 | [diff] [blame] | 1698 | if (bvc) { |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1699 | bssgp_bvc_fsm_set_max_pdu_len(bvc->fi, nse->max_sdu_len); |
Daniel Willmann | 3ea3793 | 2021-02-10 13:41:14 +0100 | [diff] [blame] | 1700 | osmo_fsm_inst_dispatch(bvc->fi, BSSGP_BVCFSM_E_REQ_RESET, &cause); |
Daniel Willmann | 38b9c9a | 2021-03-09 15:54:44 +0100 | [diff] [blame] | 1701 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1702 | } |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1703 | break; |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1704 | case GPRS_NS2_AFF_CAUSE_FAILURE: |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1705 | nse = gbproxy_nse_by_nsei(cfg, nsp->nsei, NSE_F_BSS | NSE_F_SGSN); |
| 1706 | if (!nse) { |
| 1707 | LOGP(DGPRS, LOGL_ERROR, "Unknown NSE(%05d) became unavailable\n", nsp->nsei); |
| 1708 | break; |
| 1709 | } |
Daniel Willmann | 37518b3 | 2021-05-27 18:13:36 +0200 | [diff] [blame] | 1710 | |
| 1711 | nse->alive = false; |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1712 | if (nse->sgsn_facing) { |
Daniel Willmann | 1f3470f | 2021-03-11 09:53:42 +0100 | [diff] [blame] | 1713 | struct hlist_node *ntmp; |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1714 | /* SGSN */ |
| 1715 | /* TODO: When to block all PtP towards bss? Only if all SGSN are down? */ |
Daniel Willmann | 1f3470f | 2021-03-11 09:53:42 +0100 | [diff] [blame] | 1716 | hash_for_each_safe(nse->bvcs, i, ntmp, bvc, list) { |
| 1717 | if (bvc->bvci == 0) |
| 1718 | continue; |
| 1719 | gbproxy_bvc_free(bvc); |
| 1720 | } |
Pau Espin Pedrol | 5643836 | 2021-06-04 18:03:44 +0200 | [diff] [blame] | 1721 | rate_ctr_inc(rate_ctr_group_get_ctr(cfg->ctrg, GBPROX_GLOB_CTR_RESTART_RESET_SGSN)); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1722 | } else { |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1723 | /* BSS became unavailable |
| 1724 | * Block matching PtP-BVCs on SGSN-side */ |
| 1725 | hash_for_each(nse->bvcs, i, bvc, list) { |
| 1726 | if (bvc->bvci == 0) |
| 1727 | continue; |
| 1728 | /* Get BVC for each SGSN and send block request */ |
| 1729 | struct gbproxy_cell *cell = bvc->cell; |
| 1730 | for (int j = 0; j < GBPROXY_MAX_NR_SGSN; j++) { |
| 1731 | struct gbproxy_bvc *sgsn_bvc = cell->sgsn_bvc[j]; |
| 1732 | if (!sgsn_bvc) |
| 1733 | continue; |
| 1734 | |
| 1735 | /* Block BVC, indicate BSS equipment failure */ |
| 1736 | uint8_t cause = BSSGP_CAUSE_EQUIP_FAIL; |
| 1737 | osmo_fsm_inst_dispatch(sgsn_bvc->fi, BSSGP_BVCFSM_E_REQ_BLOCK, &cause); |
Daniel Willmann | dc763fd | 2021-09-24 16:45:38 +0200 | [diff] [blame] | 1738 | sgsn_bvc->inactive = true; |
Daniel Willmann | f96cac5 | 2021-03-09 16:14:18 +0100 | [diff] [blame] | 1739 | } |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1740 | } |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1741 | |
Daniel Willmann | 1f3470f | 2021-03-11 09:53:42 +0100 | [diff] [blame] | 1742 | /* This frees the BVCs for us as well */ |
| 1743 | gbproxy_nse_free(nse); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1744 | } |
Harald Welte | 9b367d2 | 2021-01-18 13:55:51 +0100 | [diff] [blame] | 1745 | LOGP(DGPRS, LOGL_NOTICE, "NS-NSE %d became unavailable\n", nsp->nsei); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1746 | break; |
| 1747 | default: |
Harald Welte | 9b367d2 | 2021-01-18 13:55:51 +0100 | [diff] [blame] | 1748 | LOGP(DGPRS, LOGL_NOTICE, "NS: Unknown NS-STATUS.ind cause=%s from NS\n", |
Harald Welte | 95cf9fb | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1749 | gprs_ns2_aff_cause_prim_str(nsp->u.status.cause)); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1750 | break; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1751 | } |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1752 | } |
| 1753 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1754 | /* called by the ns layer */ |
| 1755 | int gprs_ns2_prim_cb(struct osmo_prim_hdr *oph, void *ctx) |
| 1756 | { |
| 1757 | struct osmo_gprs_ns2_prim *nsp; |
| 1758 | struct gbproxy_config *cfg = (struct gbproxy_config *) ctx; |
Daniel Willmann | 8f407b1 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1759 | uintptr_t bvci; |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1760 | int rc = 0; |
| 1761 | |
| 1762 | if (oph->sap != SAP_NS) |
| 1763 | return 0; |
| 1764 | |
| 1765 | nsp = container_of(oph, struct osmo_gprs_ns2_prim, oph); |
| 1766 | |
| 1767 | if (oph->operation != PRIM_OP_INDICATION) { |
Harald Welte | 9b367d2 | 2021-01-18 13:55:51 +0100 | [diff] [blame] | 1768 | LOGP(DGPRS, LOGL_NOTICE, "NS: Unexpected primitive operation %s from NS\n", |
Harald Welte | 95cf9fb | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1769 | get_value_string(osmo_prim_op_names, oph->operation)); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1770 | return 0; |
| 1771 | } |
| 1772 | |
| 1773 | switch (oph->primitive) { |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1774 | case GPRS_NS2_PRIM_UNIT_DATA: |
Daniel Willmann | 8f407b1 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1775 | |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1776 | /* hand the message into the BSSGP implementation */ |
| 1777 | msgb_bssgph(oph->msg) = oph->msg->l3h; |
| 1778 | msgb_bvci(oph->msg) = nsp->bvci; |
| 1779 | msgb_nsei(oph->msg) = nsp->nsei; |
Daniel Willmann | 8f407b1 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1780 | bvci = nsp->bvci | BVC_LOG_CTX_FLAG; |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1781 | |
Daniel Willmann | 8f407b1 | 2020-12-02 19:33:50 +0100 | [diff] [blame] | 1782 | log_set_context(LOG_CTX_GB_BVC, (void *)bvci); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1783 | rc = gbprox_rcvmsg(cfg, oph->msg); |
Daniel Willmann | b655010 | 2020-11-04 17:32:56 +0100 | [diff] [blame] | 1784 | msgb_free(oph->msg); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1785 | break; |
Alexander Couzens | 55c36f9 | 2021-01-27 20:56:55 +0100 | [diff] [blame] | 1786 | case GPRS_NS2_PRIM_STATUS: |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1787 | gprs_ns_prim_status_cb(cfg, nsp); |
| 1788 | break; |
| 1789 | default: |
Harald Welte | 9b367d2 | 2021-01-18 13:55:51 +0100 | [diff] [blame] | 1790 | LOGP(DGPRS, LOGL_NOTICE, "NS: Unknown prim %s %s from NS\n", |
Harald Welte | 95cf9fb | 2020-11-30 10:55:22 +0100 | [diff] [blame] | 1791 | gprs_ns2_prim_str(oph->primitive), |
| 1792 | get_value_string(osmo_prim_op_names, oph->operation)); |
Alexander Couzens | 951e133 | 2020-09-22 13:21:46 +0200 | [diff] [blame] | 1793 | break; |
| 1794 | } |
| 1795 | |
| 1796 | return rc; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1797 | } |
| 1798 | |
| 1799 | void gbprox_reset(struct gbproxy_config *cfg) |
| 1800 | { |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1801 | struct gbproxy_nse *nse; |
| 1802 | struct hlist_node *ntmp; |
Harald Welte | 8b4c794 | 2020-12-05 10:14:49 +0100 | [diff] [blame] | 1803 | int i, j; |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1804 | |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1805 | hash_for_each_safe(cfg->bss_nses, i, ntmp, nse, list) { |
Harald Welte | 8b4c794 | 2020-12-05 10:14:49 +0100 | [diff] [blame] | 1806 | struct gbproxy_bvc *bvc; |
| 1807 | struct hlist_node *tmp; |
| 1808 | hash_for_each_safe(nse->bvcs, j, tmp, bvc, list) |
Harald Welte | 560bdb3 | 2020-12-04 22:24:47 +0100 | [diff] [blame] | 1809 | gbproxy_bvc_free(bvc); |
Daniel Willmann | e50550e | 2020-11-26 18:19:21 +0100 | [diff] [blame] | 1810 | |
| 1811 | gbproxy_nse_free(nse); |
| 1812 | } |
Harald Welte | e520964 | 2020-12-05 19:59:45 +0100 | [diff] [blame] | 1813 | /* FIXME: cells */ |
| 1814 | /* FIXME: SGSN side BVCs (except signaling) */ |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1815 | |
| 1816 | rate_ctr_group_free(cfg->ctrg); |
| 1817 | gbproxy_init_config(cfg); |
| 1818 | } |
| 1819 | |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1820 | static void tlli_cache_cleanup(void *data) |
| 1821 | { |
| 1822 | struct gbproxy_config *cfg = data; |
| 1823 | gbproxy_tlli_cache_cleanup(cfg); |
| 1824 | |
| 1825 | /* TODO: Disable timer when cache is empty */ |
| 1826 | osmo_timer_schedule(&cfg->tlli_cache.timer, 2, 0); |
| 1827 | } |
| 1828 | |
Daniel Willmann | c8a5009 | 2021-01-17 13:11:41 +0100 | [diff] [blame] | 1829 | static void imsi_cache_cleanup(void *data) |
| 1830 | { |
| 1831 | struct gbproxy_config *cfg = data; |
| 1832 | gbproxy_imsi_cache_cleanup(cfg); |
| 1833 | |
| 1834 | /* TODO: Disable timer when cache is empty */ |
| 1835 | osmo_timer_schedule(&cfg->imsi_cache.timer, 2, 0); |
| 1836 | } |
| 1837 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1838 | int gbproxy_init_config(struct gbproxy_config *cfg) |
| 1839 | { |
| 1840 | struct timespec tp; |
| 1841 | |
Harald Welte | 209dc9f | 2020-12-12 19:02:16 +0100 | [diff] [blame] | 1842 | /* by default we advertise 100% of the BSS-side capacity to _each_ SGSN */ |
| 1843 | cfg->pool.bvc_fc_ratio = 100; |
Daniel Willmann | ee834af | 2020-12-14 16:22:39 +0100 | [diff] [blame] | 1844 | cfg->pool.null_nri_ranges = osmo_nri_ranges_alloc(cfg); |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1845 | /* TODO: Make configurable */ |
Daniel Willmann | bd12f3f | 2021-01-13 18:16:04 +0100 | [diff] [blame] | 1846 | cfg->tlli_cache.timeout = 10; |
Daniel Willmann | c8a5009 | 2021-01-17 13:11:41 +0100 | [diff] [blame] | 1847 | cfg->imsi_cache.timeout = 10; |
Daniel Willmann | ee834af | 2020-12-14 16:22:39 +0100 | [diff] [blame] | 1848 | |
Harald Welte | d2fef95 | 2020-12-05 00:31:07 +0100 | [diff] [blame] | 1849 | hash_init(cfg->bss_nses); |
Daniel Willmann | 1e7be5d | 2020-12-21 18:08:21 +0100 | [diff] [blame] | 1850 | hash_init(cfg->sgsn_nses); |
| 1851 | hash_init(cfg->cells); |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1852 | hash_init(cfg->tlli_cache.entries); |
Daniel Willmann | ee834af | 2020-12-14 16:22:39 +0100 | [diff] [blame] | 1853 | INIT_LLIST_HEAD(&cfg->sgsns); |
| 1854 | |
Daniel Willmann | 77493b1 | 2020-12-29 21:13:31 +0100 | [diff] [blame] | 1855 | osmo_timer_setup(&cfg->tlli_cache.timer, tlli_cache_cleanup, cfg); |
| 1856 | osmo_timer_schedule(&cfg->tlli_cache.timer, 2, 0); |
| 1857 | |
Daniel Willmann | c8a5009 | 2021-01-17 13:11:41 +0100 | [diff] [blame] | 1858 | /* We could also combine both timers */ |
| 1859 | osmo_timer_setup(&cfg->imsi_cache.timer, imsi_cache_cleanup, cfg); |
| 1860 | osmo_timer_schedule(&cfg->imsi_cache.timer, 2, 0); |
| 1861 | |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1862 | cfg->ctrg = rate_ctr_group_alloc(tall_sgsn_ctx, &global_ctrg_desc, 0); |
| 1863 | if (!cfg->ctrg) { |
| 1864 | LOGP(DGPRS, LOGL_ERROR, "Cannot allocate global counter group!\n"); |
| 1865 | return -1; |
| 1866 | } |
| 1867 | osmo_clock_gettime(CLOCK_REALTIME, &tp); |
Harald Welte | c169de4 | 2020-12-07 13:12:13 +0100 | [diff] [blame] | 1868 | osmo_fsm_log_timeouts(true); |
Pau Espin Pedrol | 1ddefb1 | 2019-08-30 19:48:34 +0200 | [diff] [blame] | 1869 | |
| 1870 | return 0; |
Oliver Smith | 29532c2 | 2021-01-29 11:13:00 +0100 | [diff] [blame] | 1871 | } |