Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1 | /*! \file gprs_ns2_message.c |
| 2 | * NS-over-FR-over-GRE implementation. |
| 3 | * GPRS Networks Service (NS) messages on the Gb interface. |
| 4 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| 5 | * as well as its successor 3GPP TS 48.016 */ |
| 6 | |
| 7 | /* (C) 2020 sysmocom - s.f.m.c. GmbH |
| 8 | * Author: Alexander Couzens <lynxis@fe80.eu> |
| 9 | * |
| 10 | * All Rights Reserved |
| 11 | * |
| 12 | * SPDX-License-Identifier: GPL-2.0+ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | #include <errno.h> |
| 30 | |
| 31 | #include <osmocom/core/byteswap.h> |
| 32 | #include <osmocom/core/rate_ctr.h> |
| 33 | #include <osmocom/core/stat_item.h> |
| 34 | #include <osmocom/core/stats.h> |
| 35 | #include <osmocom/gsm/tlv.h> |
| 36 | #include <osmocom/gprs/gprs_msgb.h> |
| 37 | #include <osmocom/gprs/gprs_ns2.h> |
| 38 | #include <osmocom/gprs/protocol/gsm_08_16.h> |
| 39 | |
| 40 | #include "gprs_ns2_internal.h" |
| 41 | |
| 42 | #define ERR_IF_NSVC_USES_SNS(nsvc, reason) \ |
| 43 | do { \ |
| 44 | if (!nsvc->nse->bss_sns_fi) \ |
| 45 | break; \ |
| 46 | LOGP(DLNS, LOGL_DEBUG, "NSEI=%u Rx invalid packet %s with SNS\n", \ |
| 47 | nsvc->nse->nsei, reason); \ |
| 48 | } while (0) |
| 49 | |
| 50 | enum ns_ctr { |
| 51 | NS_CTR_PKTS_IN, |
| 52 | NS_CTR_PKTS_OUT, |
| 53 | NS_CTR_BYTES_IN, |
| 54 | NS_CTR_BYTES_OUT, |
| 55 | NS_CTR_BLOCKED, |
| 56 | NS_CTR_DEAD, |
| 57 | NS_CTR_REPLACED, |
| 58 | NS_CTR_NSEI_CHG, |
| 59 | NS_CTR_INV_VCI, |
| 60 | NS_CTR_INV_NSEI, |
| 61 | NS_CTR_LOST_ALIVE, |
| 62 | NS_CTR_LOST_RESET, |
| 63 | }; |
| 64 | |
| 65 | |
| 66 | |
Harald Welte | b40cfdc | 2020-09-18 22:48:34 +0200 | [diff] [blame] | 67 | static int gprs_ns2_validate_reset(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 68 | { |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 69 | if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1) || |
| 70 | !TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_NSEI, 2)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 71 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 72 | return -1; |
| 73 | } |
| 74 | |
| 75 | return 0; |
| 76 | } |
| 77 | |
Harald Welte | b40cfdc | 2020-09-18 22:48:34 +0200 | [diff] [blame] | 78 | static int gprs_ns2_validate_reset_ack(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 79 | { |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 80 | if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_NSEI, 2)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 81 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 82 | return -1; |
| 83 | } |
| 84 | |
| 85 | return 0; |
| 86 | } |
| 87 | |
Harald Welte | b40cfdc | 2020-09-18 22:48:34 +0200 | [diff] [blame] | 88 | static int gprs_ns2_validate_block(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 89 | { |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 90 | if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2) || !TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 91 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 92 | return -1; |
| 93 | } |
| 94 | |
| 95 | return 0; |
| 96 | } |
| 97 | |
Harald Welte | b40cfdc | 2020-09-18 22:48:34 +0200 | [diff] [blame] | 98 | static int gprs_ns2_validate_block_ack(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 99 | { |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 100 | if (!TLVP_PRES_LEN(tp, NS_IE_VCI, 2)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 101 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 102 | return -1; |
| 103 | } |
| 104 | |
| 105 | return 0; |
| 106 | } |
| 107 | |
Harald Welte | b40cfdc | 2020-09-18 22:48:34 +0200 | [diff] [blame] | 108 | static int gprs_ns2_validate_status(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp, uint8_t *cause) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 109 | { |
| 110 | |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 111 | if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 112 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 113 | return -1; |
| 114 | } |
| 115 | |
| 116 | uint8_t _cause = tlvp_val8(tp, NS_IE_VCI, 0); |
| 117 | |
| 118 | switch (_cause) { |
| 119 | case NS_CAUSE_NSVC_BLOCKED: |
| 120 | case NS_CAUSE_NSVC_UNKNOWN: |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 121 | if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 122 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 123 | return -1; |
| 124 | } |
| 125 | break; |
| 126 | case NS_CAUSE_SEM_INCORR_PDU: |
| 127 | case NS_CAUSE_PDU_INCOMP_PSTATE: |
| 128 | case NS_CAUSE_PROTO_ERR_UNSPEC: |
| 129 | case NS_CAUSE_INVAL_ESSENT_IE: |
| 130 | case NS_CAUSE_MISSING_ESSENT_IE: |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 131 | if (!TLVP_PRES_LEN(tp, NS_IE_CAUSE, 1)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 132 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 133 | return -1; |
| 134 | } |
| 135 | break; |
| 136 | case NS_CAUSE_BVCI_UNKNOWN: |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 137 | if (!TLVP_PRES_LEN(tp, NS_IE_BVCI, 2)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 138 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 139 | return -1; |
| 140 | } |
| 141 | break; |
| 142 | case NS_CAUSE_UNKN_IP_TEST_FAILED: |
Harald Welte | 798efea | 2020-12-03 16:01:02 +0100 | [diff] [blame] | 143 | if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST) && !TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 144 | *cause = NS_CAUSE_MISSING_ESSENT_IE; |
| 145 | return -1; |
| 146 | } |
| 147 | break; |
| 148 | } |
| 149 | |
| 150 | return 0; |
| 151 | } |
| 152 | |
| 153 | int gprs_ns2_validate(struct gprs_ns2_vc *nsvc, |
| 154 | uint8_t pdu_type, |
| 155 | struct msgb *msg, |
| 156 | struct tlv_parsed *tp, |
| 157 | uint8_t *cause) |
| 158 | { |
| 159 | switch (pdu_type) { |
| 160 | case NS_PDUT_RESET: |
| 161 | return gprs_ns2_validate_reset(nsvc, msg, tp, cause); |
| 162 | case NS_PDUT_RESET_ACK: |
| 163 | return gprs_ns2_validate_reset_ack(nsvc, msg, tp, cause); |
| 164 | case NS_PDUT_BLOCK: |
| 165 | return gprs_ns2_validate_block(nsvc, msg, tp, cause); |
| 166 | case NS_PDUT_BLOCK_ACK: |
| 167 | return gprs_ns2_validate_block_ack(nsvc, msg, tp, cause); |
| 168 | case NS_PDUT_STATUS: |
| 169 | return gprs_ns2_validate_status(nsvc, msg, tp, cause); |
| 170 | |
| 171 | /* following PDUs doesn't have any payloads */ |
| 172 | case NS_PDUT_ALIVE: |
| 173 | case NS_PDUT_ALIVE_ACK: |
| 174 | case NS_PDUT_UNBLOCK: |
| 175 | case NS_PDUT_UNBLOCK_ACK: |
| 176 | if (msgb_l2len(msg) != sizeof(struct gprs_ns_hdr)) { |
| 177 | *cause = NS_CAUSE_PROTO_ERR_UNSPEC; |
| 178 | return -1; |
| 179 | } |
| 180 | break; |
| 181 | } |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | |
| 187 | /* transmit functions */ |
| 188 | static int ns2_tx_simple(struct gprs_ns2_vc *nsvc, uint8_t pdu_type) |
| 189 | { |
| 190 | struct msgb *msg = gprs_ns2_msgb_alloc(); |
| 191 | struct gprs_ns_hdr *nsh; |
| 192 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 193 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 194 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 195 | |
| 196 | if (!msg) |
| 197 | return -ENOMEM; |
| 198 | |
| 199 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 200 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 201 | |
| 202 | nsh->pdu_type = pdu_type; |
| 203 | |
| 204 | return nsvc->bind->send_vc(nsvc, msg); |
| 205 | } |
| 206 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 207 | /*! Transmit a NS-BLOCK on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 208 | * \param[in] vc NS-VC on which the NS-BLOCK is to be transmitted |
| 209 | * \param[in] cause Numeric NS Cause value |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 210 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 211 | int ns2_tx_block(struct gprs_ns2_vc *nsvc, uint8_t cause) |
| 212 | { |
| 213 | struct msgb *msg; |
| 214 | struct gprs_ns_hdr *nsh; |
| 215 | uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| 216 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 217 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 218 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 219 | |
| 220 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK"); |
| 221 | |
| 222 | msg = gprs_ns2_msgb_alloc(); |
| 223 | if (!msg) |
| 224 | return -ENOMEM; |
| 225 | |
| 226 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK (NSVCI=%u, cause=%s)\n", |
| 227 | nsvc->nse->nsei, nsvc->nsvci, gprs_ns2_cause_str(cause)); |
| 228 | |
| 229 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); |
| 230 | |
| 231 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 232 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 233 | nsh->pdu_type = NS_PDUT_BLOCK; |
| 234 | |
| 235 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 236 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| 237 | |
| 238 | return nsvc->bind->send_vc(nsvc, msg); |
| 239 | } |
| 240 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 241 | /*! Transmit a NS-BLOCK-ACK on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 242 | * \param[in] nsvc NS-VC on which the NS-BLOCK is to be transmitted |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 243 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 244 | int ns2_tx_block_ack(struct gprs_ns2_vc *nsvc) |
| 245 | { |
| 246 | struct msgb *msg; |
| 247 | struct gprs_ns_hdr *nsh; |
| 248 | uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| 249 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 250 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 251 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 252 | |
| 253 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK ACK"); |
| 254 | |
| 255 | msg = gprs_ns2_msgb_alloc(); |
| 256 | if (!msg) |
| 257 | return -ENOMEM; |
| 258 | |
| 259 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK ACK (NSVCI=%u)\n", nsvc->nse->nsei, nsvc->nsvci); |
| 260 | |
| 261 | /* be conservative and mark it as blocked even now! */ |
| 262 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 263 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 264 | nsh->pdu_type = NS_PDUT_BLOCK_ACK; |
| 265 | |
| 266 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| 267 | |
| 268 | return nsvc->bind->send_vc(nsvc, msg); |
| 269 | } |
| 270 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 271 | /*! Transmit a NS-RESET on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 272 | * \param[in] nsvc NS-VC used for transmission |
| 273 | * \paam[in] cause Numeric NS cause value |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 274 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 275 | int ns2_tx_reset(struct gprs_ns2_vc *nsvc, uint8_t cause) |
| 276 | { |
| 277 | struct msgb *msg; |
| 278 | struct gprs_ns_hdr *nsh; |
| 279 | uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| 280 | uint16_t nsei = osmo_htons(nsvc->nse->nsei); |
| 281 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 282 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 283 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 284 | |
| 285 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET"); |
| 286 | |
| 287 | msg = gprs_ns2_msgb_alloc(); |
| 288 | if (!msg) |
| 289 | return -ENOMEM; |
| 290 | |
| 291 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS RESET (NSVCI=%u, cause=%s)\n", |
| 292 | nsvc->nse->nsei, nsvc->nsvci, gprs_ns2_cause_str(cause)); |
| 293 | |
| 294 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 295 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 296 | nsh->pdu_type = NS_PDUT_RESET; |
| 297 | |
| 298 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 299 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| 300 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *) &nsei); |
| 301 | |
| 302 | return nsvc->bind->send_vc(nsvc, msg); |
| 303 | } |
| 304 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 305 | /*! Transmit a NS-RESET-ACK on a given NS-VC. |
| 306 | * \param[in] nsvc NS-VC used for transmission |
| 307 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 308 | int ns2_tx_reset_ack(struct gprs_ns2_vc *nsvc) |
| 309 | { |
| 310 | struct msgb *msg; |
| 311 | struct gprs_ns_hdr *nsh; |
| 312 | uint16_t nsvci, nsei; |
| 313 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 314 | /* Section 9.2.6 */ |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 315 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 316 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 317 | |
| 318 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET ACK"); |
| 319 | |
| 320 | msg = gprs_ns2_msgb_alloc(); |
| 321 | if (!msg) |
| 322 | return -ENOMEM; |
| 323 | |
| 324 | nsvci = osmo_htons(nsvc->nsvci); |
| 325 | nsei = osmo_htons(nsvc->nse->nsei); |
| 326 | |
| 327 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 328 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 329 | |
| 330 | nsh->pdu_type = NS_PDUT_RESET_ACK; |
| 331 | |
| 332 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS RESET ACK (NSVCI=%u)\n", |
| 333 | nsvc->nse->nsei, nsvc->nsvci); |
| 334 | |
| 335 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| 336 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 337 | |
| 338 | return nsvc->bind->send_vc(nsvc, msg); |
| 339 | } |
| 340 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 341 | /*! Transmit a NS-UNBLOCK on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 342 | * \param[in] nsvc NS-VC on which the NS-UNBLOCK is to be transmitted |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 343 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 344 | int ns2_tx_unblock(struct gprs_ns2_vc *nsvc) |
| 345 | { |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 346 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 347 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 348 | |
| 349 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK"); |
| 350 | |
| 351 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n", |
| 352 | nsvc->nse->nsei, nsvc->nsvci); |
| 353 | |
| 354 | return ns2_tx_simple(nsvc, NS_PDUT_UNBLOCK); |
| 355 | } |
| 356 | |
| 357 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 358 | /*! Transmit a NS-UNBLOCK-ACK on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 359 | * \param[in] nsvc NS-VC on which the NS-UNBLOCK-ACK is to be transmitted |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 360 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 361 | int ns2_tx_unblock_ack(struct gprs_ns2_vc *nsvc) |
| 362 | { |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 363 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 364 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 365 | |
| 366 | ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK ACK"); |
| 367 | |
| 368 | LOGP(DLNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n", |
| 369 | nsvc->nse->nsei, nsvc->nsvci); |
| 370 | |
| 371 | return ns2_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK); |
| 372 | } |
| 373 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 374 | /*! Transmit a NS-ALIVE on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 375 | * \param[in] nsvc NS-VC on which the NS-ALIVE is to be transmitted |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 376 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 377 | int ns2_tx_alive(struct gprs_ns2_vc *nsvc) |
| 378 | { |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 379 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 380 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 381 | LOGP(DLNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE (NSVCI=%u)\n", |
| 382 | nsvc->nse->nsei, nsvc->nsvci); |
| 383 | |
| 384 | return ns2_tx_simple(nsvc, NS_PDUT_ALIVE); |
| 385 | } |
| 386 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 387 | /*! Transmit a NS-ALIVE-ACK on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 388 | * \param[in] nsvc NS-VC on which the NS-ALIVE-ACK is to be transmitted |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 389 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 390 | int ns2_tx_alive_ack(struct gprs_ns2_vc *nsvc) |
| 391 | { |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 392 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 393 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 394 | LOGP(DLNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE_ACK (NSVCI=%u)\n", |
| 395 | nsvc->nse->nsei, nsvc->nsvci); |
| 396 | |
| 397 | return ns2_tx_simple(nsvc, NS_PDUT_ALIVE_ACK); |
| 398 | } |
| 399 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 400 | /*! Transmit NS-UNITDATA on a given NS-VC. |
| 401 | * \param[in] nsvc NS-VC on which the NS-UNITDATA is to be transmitted |
| 402 | * \param[in] bvci BVCI to encode in NS-UNITDATA header |
| 403 | * \param[in] sducontrol SDU control octet of NS header |
| 404 | * \param[in] msg message buffer containing payload |
| 405 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 406 | int ns2_tx_unit_data(struct gprs_ns2_vc *nsvc, |
| 407 | uint16_t bvci, uint8_t sducontrol, |
| 408 | struct msgb *msg) |
| 409 | { |
| 410 | struct gprs_ns_hdr *nsh; |
| 411 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 412 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 413 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 414 | |
| 415 | msg->l2h = msgb_push(msg, sizeof(*nsh) + 3); |
| 416 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 417 | if (!nsh) { |
| 418 | LOGP(DLNS, LOGL_ERROR, "Not enough headroom for NS header\n"); |
| 419 | msgb_free(msg); |
| 420 | return -EIO; |
| 421 | } |
| 422 | |
| 423 | nsh->pdu_type = NS_PDUT_UNITDATA; |
| 424 | nsh->data[0] = sducontrol; |
| 425 | nsh->data[1] = bvci >> 8; |
| 426 | nsh->data[2] = bvci & 0xff; |
| 427 | |
| 428 | return nsvc->bind->send_vc(nsvc, msg); |
| 429 | } |
| 430 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 431 | /*! Transmit a NS-STATUS on a given NS-VC. |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 432 | * \param[in] nsvc NS-VC to be used for transmission |
| 433 | * \param[in] cause Numeric NS cause value |
| 434 | * \param[in] bvci BVCI to be reset within NSVC |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 435 | * \param[in] orig_msg message causing the STATUS |
| 436 | * \returns 0 in case of success */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 437 | int ns2_tx_status(struct gprs_ns2_vc *nsvc, uint8_t cause, |
| 438 | uint16_t bvci, struct msgb *orig_msg) |
| 439 | { |
| 440 | struct msgb *msg = gprs_ns2_msgb_alloc(); |
| 441 | struct gprs_ns_hdr *nsh; |
| 442 | uint16_t nsvci = osmo_htons(nsvc->nsvci); |
| 443 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 444 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 445 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 446 | |
| 447 | bvci = osmo_htons(bvci); |
| 448 | |
| 449 | if (!msg) |
| 450 | return -ENOMEM; |
| 451 | |
| 452 | LOGP(DLNS, LOGL_NOTICE, "NSEI=%u Tx NS STATUS (NSVCI=%u, cause=%s)\n", |
| 453 | nsvc->nse->nsei, nsvc->nsvci, gprs_ns2_cause_str(cause)); |
| 454 | |
| 455 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 456 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 457 | nsh->pdu_type = NS_PDUT_STATUS; |
| 458 | |
| 459 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 460 | |
| 461 | /* Section 9.2.7.1: Static conditions for NS-VCI */ |
| 462 | if (cause == NS_CAUSE_NSVC_BLOCKED || |
| 463 | cause == NS_CAUSE_NSVC_UNKNOWN) |
| 464 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| 465 | |
| 466 | /* Section 9.2.7.2: Static conditions for NS PDU */ |
| 467 | switch (cause) { |
| 468 | case NS_CAUSE_SEM_INCORR_PDU: |
| 469 | case NS_CAUSE_PDU_INCOMP_PSTATE: |
| 470 | case NS_CAUSE_PROTO_ERR_UNSPEC: |
| 471 | case NS_CAUSE_INVAL_ESSENT_IE: |
| 472 | case NS_CAUSE_MISSING_ESSENT_IE: |
| 473 | msgb_tvlv_put(msg, NS_IE_PDU, msgb_l2len(orig_msg), |
| 474 | orig_msg->l2h); |
| 475 | break; |
| 476 | default: |
| 477 | break; |
| 478 | } |
| 479 | |
| 480 | /* Section 9.2.7.3: Static conditions for BVCI */ |
| 481 | if (cause == NS_CAUSE_BVCI_UNKNOWN) |
| 482 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&bvci); |
| 483 | |
| 484 | return nsvc->bind->send_vc(nsvc, msg); |
| 485 | } |
| 486 | |
| 487 | |
| 488 | /*! Encode + Transmit a SNS-ACK as per Section 9.3.1. |
| 489 | * \param[in] nsvc NS-VC through which to transmit the ACK |
| 490 | * \param[in] trans_id Transaction ID which to acknowledge |
| 491 | * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| 492 | * \param[in] ip4_elems Array of IPv4 Elements |
| 493 | * \param[in] num_ip4_elems number of ip4_elems |
| 494 | * \returns 0 on success; negative in case of error */ |
| 495 | int ns2_tx_sns_ack(struct gprs_ns2_vc *nsvc, uint8_t trans_id, uint8_t *cause, |
| 496 | const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| 497 | unsigned int num_ip4_elems, |
| 498 | const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| 499 | unsigned int num_ip6_elems) |
| 500 | { |
| 501 | struct msgb *msg = gprs_ns2_msgb_alloc(); |
| 502 | struct gprs_ns_hdr *nsh; |
| 503 | uint16_t nsei; |
| 504 | |
| 505 | if (!nsvc) |
| 506 | return -1; |
| 507 | |
| 508 | msg = gprs_ns2_msgb_alloc(); |
| 509 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 510 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 511 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 512 | if (!msg) |
| 513 | return -ENOMEM; |
| 514 | |
| 515 | if (!nsvc->nse->bss_sns_fi) { |
| 516 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| 517 | nsvc->nse->nsei); |
| 518 | msgb_free(msg); |
| 519 | return -EIO; |
| 520 | } |
| 521 | |
| 522 | nsei = osmo_htons(nsvc->nse->nsei); |
| 523 | |
| 524 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 525 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 526 | |
| 527 | nsh->pdu_type = SNS_PDUT_ACK; |
| 528 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 529 | msgb_v_put(msg, trans_id); |
| 530 | if (cause) |
| 531 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| 532 | if (ip4_elems) { |
| 533 | /* List of IP4 Elements 10.3.2c */ |
| 534 | msgb_tvlv_put(msg, NS_IE_IPv4_LIST, |
| 535 | num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| 536 | (const uint8_t *)ip4_elems); |
| 537 | } |
| 538 | if (ip6_elems) { |
| 539 | /* List of IP6 elements 10.3.2d */ |
| 540 | msgb_tvlv_put(msg, NS_IE_IPv6_LIST, |
| 541 | num_ip6_elems*sizeof(struct gprs_ns_ie_ip6_elem), |
| 542 | (const uint8_t *)ip6_elems); |
| 543 | } |
| 544 | |
| 545 | return nsvc->bind->send_vc(nsvc, msg); |
| 546 | } |
| 547 | |
| 548 | /*! Encode + Transmit a SNS-CONFIG as per Section 9.3.4. |
| 549 | * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG |
| 550 | * \param[in] end_flag Whether or not this is the last SNS-CONFIG |
| 551 | * \param[in] ip4_elems Array of IPv4 Elements |
| 552 | * \param[in] num_ip4_elems number of ip4_elems |
| 553 | * \returns 0 on success; negative in case of error */ |
| 554 | int ns2_tx_sns_config(struct gprs_ns2_vc *nsvc, bool end_flag, |
| 555 | const struct gprs_ns_ie_ip4_elem *ip4_elems, |
| 556 | unsigned int num_ip4_elems, |
| 557 | const struct gprs_ns_ie_ip6_elem *ip6_elems, |
| 558 | unsigned int num_ip6_elems) |
| 559 | { |
| 560 | struct msgb *msg; |
| 561 | struct gprs_ns_hdr *nsh; |
| 562 | uint16_t nsei; |
| 563 | |
| 564 | if (!nsvc) |
| 565 | return -1; |
| 566 | |
| 567 | msg = gprs_ns2_msgb_alloc(); |
| 568 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 569 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 570 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 571 | if (!msg) |
| 572 | return -ENOMEM; |
| 573 | |
| 574 | if (!nsvc->nse->bss_sns_fi) { |
| 575 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| 576 | nsvc->nse->nsei); |
| 577 | msgb_free(msg); |
| 578 | return -EIO; |
| 579 | } |
| 580 | |
| 581 | nsei = osmo_htons(nsvc->nse->nsei); |
| 582 | |
| 583 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 584 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 585 | |
| 586 | nsh->pdu_type = SNS_PDUT_CONFIG; |
| 587 | |
| 588 | msgb_v_put(msg, end_flag ? 0x01 : 0x00); |
| 589 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 590 | |
| 591 | /* List of IP4 Elements 10.3.2c */ |
| 592 | if (ip4_elems) { |
| 593 | msgb_tvlv_put(msg, NS_IE_IPv4_LIST, num_ip4_elems*sizeof(struct gprs_ns_ie_ip4_elem), |
| 594 | (const uint8_t *)ip4_elems); |
| 595 | } else if (ip6_elems) { |
| 596 | /* List of IP6 elements 10.3.2d */ |
| 597 | msgb_tvlv_put(msg, NS_IE_IPv6_LIST, num_ip6_elems*sizeof(struct gprs_ns_ie_ip6_elem), |
| 598 | (const uint8_t *)ip6_elems); |
| 599 | } |
| 600 | |
| 601 | return nsvc->bind->send_vc(nsvc, msg); |
| 602 | } |
| 603 | |
| 604 | /*! Encode + Transmit a SNS-CONFIG-ACK as per Section 9.3.5. |
| 605 | * \param[in] nsvc NS-VC through which to transmit the SNS-CONFIG-ACK |
| 606 | * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| 607 | * \returns 0 on success; negative in case of error */ |
| 608 | int ns2_tx_sns_config_ack(struct gprs_ns2_vc *nsvc, uint8_t *cause) |
| 609 | { |
| 610 | struct msgb *msg; |
| 611 | struct gprs_ns_hdr *nsh; |
| 612 | uint16_t nsei; |
| 613 | |
| 614 | if (!nsvc) |
| 615 | return -1; |
| 616 | |
| 617 | msg = gprs_ns2_msgb_alloc(); |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 618 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 619 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 620 | if (!msg) |
| 621 | return -ENOMEM; |
| 622 | |
| 623 | if (!nsvc->nse->bss_sns_fi) { |
| 624 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| 625 | nsvc->nse->nsei); |
| 626 | msgb_free(msg); |
| 627 | return -EIO; |
| 628 | } |
| 629 | |
| 630 | nsei = osmo_htons(nsvc->nse->nsei); |
| 631 | |
| 632 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 633 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 634 | |
| 635 | nsh->pdu_type = SNS_PDUT_CONFIG_ACK; |
| 636 | |
| 637 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 638 | if (cause) |
| 639 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| 640 | |
| 641 | return nsvc->bind->send_vc(nsvc, msg); |
| 642 | } |
| 643 | |
| 644 | |
| 645 | /*! Encode + transmit a SNS-SIZE as per Section 9.3.7. |
| 646 | * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE |
| 647 | * \param[in] reset_flag Whether or not to add a RESET flag |
| 648 | * \param[in] max_nr_nsvc Maximum number of NS-VCs |
| 649 | * \param[in] ip4_ep_nr Number of IPv4 endpoints (< 0 will omit the TLV) |
| 650 | * \param[in] ip6_ep_nr Number of IPv6 endpoints (< 0 will omit the TLV) |
| 651 | * \returns 0 on success; negative in case of error */ |
| 652 | int ns2_tx_sns_size(struct gprs_ns2_vc *nsvc, bool reset_flag, uint16_t max_nr_nsvc, |
| 653 | int ip4_ep_nr, int ip6_ep_nr) |
| 654 | { |
| 655 | struct msgb *msg = gprs_ns2_msgb_alloc(); |
| 656 | struct gprs_ns_hdr *nsh; |
| 657 | uint16_t nsei; |
| 658 | |
| 659 | if (!nsvc) |
| 660 | return -1; |
| 661 | |
| 662 | msg = gprs_ns2_msgb_alloc(); |
| 663 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 664 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 665 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 666 | if (!msg) |
| 667 | return -ENOMEM; |
| 668 | |
| 669 | if (!nsvc->nse->bss_sns_fi) { |
| 670 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| 671 | nsvc->nse->nsei); |
| 672 | msgb_free(msg); |
| 673 | return -EIO; |
| 674 | } |
| 675 | |
| 676 | nsei = osmo_htons(nsvc->nse->nsei); |
| 677 | |
| 678 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 679 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 680 | |
| 681 | nsh->pdu_type = SNS_PDUT_SIZE; |
| 682 | |
| 683 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 684 | msgb_tv_put(msg, NS_IE_RESET_FLAG, reset_flag ? 0x01 : 0x00); |
| 685 | msgb_tv16_put(msg, NS_IE_MAX_NR_NSVC, max_nr_nsvc); |
| 686 | if (ip4_ep_nr >= 0) |
| 687 | msgb_tv16_put(msg, NS_IE_IPv4_EP_NR, ip4_ep_nr); |
| 688 | if (ip6_ep_nr >= 0) |
| 689 | msgb_tv16_put(msg, NS_IE_IPv6_EP_NR, ip6_ep_nr); |
| 690 | |
| 691 | return nsvc->bind->send_vc(nsvc, msg); |
| 692 | } |
| 693 | |
| 694 | /*! Encode + Transmit a SNS-SIZE-ACK as per Section 9.3.8. |
| 695 | * \param[in] nsvc NS-VC through which to transmit the SNS-SIZE-ACK |
| 696 | * \param[in] cause Pointer to cause value (NULL if no cause to be sent) |
| 697 | * \returns 0 on success; negative in case of error */ |
| 698 | int ns2_tx_sns_size_ack(struct gprs_ns2_vc *nsvc, uint8_t *cause) |
| 699 | { |
| 700 | struct msgb *msg = gprs_ns2_msgb_alloc(); |
| 701 | struct gprs_ns_hdr *nsh; |
| 702 | uint16_t nsei; |
| 703 | |
Daniel Willmann | 751977b | 2020-12-02 18:59:44 +0100 | [diff] [blame] | 704 | log_set_context(LOG_CTX_GB_NSE, nsvc->nse); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 705 | log_set_context(LOG_CTX_GB_NSVC, nsvc); |
| 706 | if (!msg) |
| 707 | return -ENOMEM; |
| 708 | |
| 709 | if (!nsvc->nse->bss_sns_fi) { |
| 710 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", |
| 711 | nsvc->nse->nsei); |
| 712 | msgb_free(msg); |
| 713 | return -EIO; |
| 714 | } |
| 715 | |
| 716 | nsei = osmo_htons(nsvc->nse->nsei); |
| 717 | |
| 718 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 719 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 720 | |
| 721 | nsh->pdu_type = SNS_PDUT_SIZE_ACK; |
| 722 | |
| 723 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
| 724 | if (cause) |
| 725 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, cause); |
| 726 | |
| 727 | return nsvc->bind->send_vc(nsvc, msg); |
| 728 | } |
| 729 | |
| 730 | |