Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1 | /* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface |
| 2 | * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ |
| 3 | |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 4 | /* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 5 | * (C) 2010 by On-Waves |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 17 | * GNU Affero General Public License for more details. |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 18 | * |
Harald Welte | 9af6ddf | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
Harald Welte | eaa614c | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 27 | #include <stdint.h> |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 28 | #include <errno.h> |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 29 | #include <stdbool.h> |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 30 | #include <netinet/in.h> |
Harald Welte | 421cba4 | 2010-05-02 23:11:50 +0200 | [diff] [blame] | 31 | #include <arpa/inet.h> |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 32 | |
Daniel Willmann | 6292c8d | 2016-05-21 17:35:57 +0200 | [diff] [blame] | 33 | #include "bscconfig.h" |
| 34 | |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 35 | #include <osmocom/core/msgb.h> |
Harald Welte | d36ff76 | 2011-03-23 18:26:56 +0100 | [diff] [blame] | 36 | #include <osmocom/gsm/tlv.h> |
| 37 | #include <osmocom/gsm/gsm_utils.h> |
Pablo Neira Ayuso | 136f453 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 38 | #include <osmocom/core/signal.h> |
| 39 | #include <osmocom/core/talloc.h> |
| 40 | #include <osmocom/core/rate_ctr.h> |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 41 | #include <osmocom/core/utils.h> |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 42 | #include <osmocom/core/tdef.h> |
Daniel Willmann | 770f3e3 | 2016-05-21 00:31:12 +0200 | [diff] [blame] | 43 | #include <osmocom/crypt/auth.h> |
Neels Hofmeyr | 3c7656a | 2022-03-07 15:38:59 +0100 | [diff] [blame] | 44 | #include <osmocom/crypt/utran_cipher.h> |
Harald Welte | 53373bc | 2016-04-20 17:11:43 +0200 | [diff] [blame] | 45 | #include <osmocom/gsm/protocol/gsm_04_08_gprs.h> |
Harald Welte | d605709 | 2010-05-02 12:57:45 +0200 | [diff] [blame] | 46 | |
Harald Welte | ea34a4e | 2012-06-16 14:59:56 +0800 | [diff] [blame] | 47 | #include <osmocom/gprs/gprs_bssgp.h> |
| 48 | |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 49 | #include <osmocom/sgsn/debug.h> |
| 50 | #include <osmocom/sgsn/gprs_llc.h> |
| 51 | #include <osmocom/sgsn/gprs_sgsn.h> |
| 52 | #include <osmocom/sgsn/gprs_gmm.h> |
| 53 | #include <osmocom/sgsn/gprs_utils.h> |
| 54 | #include <osmocom/sgsn/gprs_subscriber.h> |
| 55 | #include <osmocom/sgsn/sgsn.h> |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 56 | #include <osmocom/sgsn/gprs_gmm_attach.h> |
Pau Espin Pedrol | 02514bc | 2019-08-30 16:14:22 +0200 | [diff] [blame] | 57 | #include <osmocom/sgsn/gprs_mm_state_gb_fsm.h> |
Pau Espin Pedrol | ccd1252 | 2019-08-30 17:06:36 +0200 | [diff] [blame] | 58 | #include <osmocom/sgsn/gprs_mm_state_iu_fsm.h> |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 59 | #include <osmocom/sgsn/gprs_gmm_fsm.h> |
Neels Hofmeyr | 396f2e6 | 2017-09-04 15:13:25 +0200 | [diff] [blame] | 60 | #include <osmocom/sgsn/signal.h> |
| 61 | #include <osmocom/sgsn/gprs_sndcp.h> |
Pau Espin Pedrol | 6dfb5fe | 2019-08-29 17:21:00 +0200 | [diff] [blame] | 62 | #include <osmocom/sgsn/gprs_ranap.h> |
Pau Espin Pedrol | 05d5f28 | 2022-12-23 17:09:08 +0100 | [diff] [blame] | 63 | #include <osmocom/sgsn/gprs_sm.h> |
Pau Espin Pedrol | 8ec269a | 2023-01-05 19:19:32 +0100 | [diff] [blame] | 64 | #include <osmocom/sgsn/gtp.h> |
Pau Espin Pedrol | 05190c3 | 2023-01-05 20:13:13 +0100 | [diff] [blame] | 65 | #include <osmocom/sgsn/pdpctx.h> |
Daniel Willmann | 6292c8d | 2016-05-21 17:35:57 +0200 | [diff] [blame] | 66 | |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 67 | #include <pdp.h> |
| 68 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 69 | #define PTMSI_ALLOC |
| 70 | |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 71 | static const struct tlv_definition gsm48_gmm_att_tlvdef = { |
| 72 | .def = { |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 73 | [GSM48_IE_GMM_CIPH_CKSN] = { TLV_TYPE_FIXED, 1 }, |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 74 | [GSM48_IE_GMM_TIMER_READY] = { TLV_TYPE_TV, 1 }, |
| 75 | [GSM48_IE_GMM_ALLOC_PTMSI] = { TLV_TYPE_TLV, 0 }, |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 76 | [GSM48_IE_GMM_PTMSI_SIG] = { TLV_TYPE_FIXED, 3 }, |
| 77 | [GSM48_IE_GMM_AUTH_RAND] = { TLV_TYPE_FIXED, 16 }, |
| 78 | [GSM48_IE_GMM_AUTH_SRES] = { TLV_TYPE_FIXED, 4 }, |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 79 | [GSM48_IE_GMM_AUTH_RES_EXT] = { TLV_TYPE_TLV, 0 }, |
| 80 | [GSM48_IE_GMM_AUTH_FAIL_PAR] = { TLV_TYPE_TLV, 0 }, |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 81 | [GSM48_IE_GMM_IMEISV] = { TLV_TYPE_TLV, 0 }, |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 82 | [GSM48_IE_GMM_DRX_PARAM] = { TLV_TYPE_FIXED, 2 }, |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 83 | [GSM48_IE_GMM_MS_NET_CAPA] = { TLV_TYPE_TLV, 0 }, |
| 84 | [GSM48_IE_GMM_PDP_CTX_STATUS] = { TLV_TYPE_TLV, 0 }, |
| 85 | [GSM48_IE_GMM_PS_LCS_CAPA] = { TLV_TYPE_TLV, 0 }, |
| 86 | [GSM48_IE_GMM_GMM_MBMS_CTX_ST] = { TLV_TYPE_TLV, 0 }, |
| 87 | }, |
| 88 | }; |
| 89 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 90 | /* Our implementation, should be kept in SGSN */ |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 91 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 92 | static void mmctx_timer_cb(void *_mm); |
| 93 | |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 94 | static void mmctx_timer_start(struct sgsn_mm_ctx *mm, unsigned int T) |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 95 | { |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 96 | unsigned long seconds; |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 97 | if (osmo_timer_pending(&mm->timer)) |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 98 | LOGMMCTXP(LOGL_ERROR, mm, "Starting MM timer %u while old " |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 99 | "timer %u pending\n", T, mm->T); |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 100 | |
| 101 | seconds = osmo_tdef_get(sgsn->cfg.T_defs, T, OSMO_TDEF_S, -1); |
| 102 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 103 | mm->T = T; |
| 104 | mm->num_T_exp = 0; |
| 105 | |
| 106 | /* FIXME: we should do this only once ? */ |
Pablo Neira Ayuso | 5121576 | 2017-05-08 20:57:52 +0200 | [diff] [blame] | 107 | osmo_timer_setup(&mm->timer, mmctx_timer_cb, mm); |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 108 | osmo_timer_schedule(&mm->timer, seconds, 0); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | static void mmctx_timer_stop(struct sgsn_mm_ctx *mm, unsigned int T) |
| 112 | { |
| 113 | if (mm->T != T) |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 114 | LOGMMCTXP(LOGL_ERROR, mm, "Stopping MM timer %u but " |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 115 | "%u is running\n", T, mm->T); |
Pablo Neira Ayuso | bf540cb | 2011-05-06 12:11:06 +0200 | [diff] [blame] | 116 | osmo_timer_del(&mm->timer); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 117 | } |
| 118 | |
Jacob Erlbeck | 81ffb74 | 2015-01-23 11:33:51 +0100 | [diff] [blame] | 119 | time_t gprs_max_time_to_idle(void) |
| 120 | { |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 121 | unsigned long T3314, T3312; |
| 122 | |
| 123 | T3314 = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1); |
| 124 | T3312 = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1); |
| 125 | return T3314 + (T3312 + 4 * 60); |
Jacob Erlbeck | 81ffb74 | 2015-01-23 11:33:51 +0100 | [diff] [blame] | 126 | } |
| 127 | |
Neels Hofmeyr | 723f7c7 | 2016-08-11 19:12:54 +0200 | [diff] [blame] | 128 | /* Send a message through the underlying layer. |
| 129 | * For param encryptable, see 3GPP TS 24.008 § 4.7.1.2 and |
| 130 | * gsm48_hdr_gmm_cipherable(). Pass false for not cipherable messages. */ |
Pau Espin Pedrol | 35f0e66 | 2019-09-02 18:27:27 +0200 | [diff] [blame] | 131 | int gsm48_gmm_sendmsg(struct msgb *msg, int command, |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 132 | struct sgsn_mm_ctx *mm, bool encryptable) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 133 | { |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 134 | if (mm) { |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 135 | rate_ctr_inc(rate_ctr_group_get_ctr(mm->ctrg, GMM_CTR_PKTS_SIG_OUT)); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 136 | #ifdef BUILD_IU |
| 137 | if (mm->ran_type == MM_CTX_T_UTRAN_Iu) |
Neels Hofmeyr | a7a3947 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 138 | return ranap_iu_tx(msg, GPRS_SAPI_GMM); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 139 | #endif |
| 140 | } |
| 141 | |
| 142 | #ifdef BUILD_IU |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 143 | if (MSG_IU_UE_CTX(msg)) |
Neels Hofmeyr | a7a3947 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 144 | return ranap_iu_tx(msg, GPRS_SAPI_GMM); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 145 | #endif |
Harald Welte | 8acd88f | 2010-05-18 10:57:45 +0200 | [diff] [blame] | 146 | |
Harald Welte | 11d7c10 | 2010-05-02 11:54:55 +0200 | [diff] [blame] | 147 | /* caller needs to provide TLLI, BVCI and NSEI */ |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 148 | return gprs_llc_tx_ui(msg, GPRS_SAPI_GMM, command, mm, encryptable); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 149 | } |
| 150 | |
Harald Welte | 11d7c10 | 2010-05-02 11:54:55 +0200 | [diff] [blame] | 151 | /* copy identifiers from old message to new message, this |
| 152 | * is required so lower layers can route it correctly */ |
| 153 | static void gmm_copy_id(struct msgb *msg, const struct msgb *old) |
| 154 | { |
| 155 | msgb_tlli(msg) = msgb_tlli(old); |
| 156 | msgb_bvci(msg) = msgb_bvci(old); |
| 157 | msgb_nsei(msg) = msgb_nsei(old); |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 158 | MSG_IU_UE_CTX_SET(msg, MSG_IU_UE_CTX(old)); |
Harald Welte | 11d7c10 | 2010-05-02 11:54:55 +0200 | [diff] [blame] | 159 | } |
| 160 | |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 161 | /* Store BVCI/NSEI in MM context */ |
Pau Espin Pedrol | 8333ef1 | 2019-08-29 19:26:12 +0200 | [diff] [blame] | 162 | void msgid2mmctx(struct sgsn_mm_ctx *mm, const struct msgb *msg) |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 163 | { |
Alexander Couzens | f8d3e7f | 2019-08-12 18:28:11 +0200 | [diff] [blame] | 164 | /* check for Iu or Gb */ |
| 165 | if (!MSG_IU_UE_CTX(msg)) { |
| 166 | mm->gb.bvci = msgb_bvci(msg); |
| 167 | mm->gb.nsei = msgb_nsei(msg); |
Neels Hofmeyr | a7a3947 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 168 | } |
Alexander Couzens | f8d3e7f | 2019-08-12 18:28:11 +0200 | [diff] [blame] | 169 | #ifdef BUILD_IU |
| 170 | else { |
| 171 | /* In case a Iu connection is reconnected we need to update the ue ctx */ |
| 172 | /* FIXME: the old ue_ctx have to be freed/disconnected */ |
| 173 | mm->iu.ue_ctx = MSG_IU_UE_CTX(msg); |
| 174 | if (mm->ran_type == MM_CTX_T_UTRAN_Iu |
| 175 | && mm->iu.ue_ctx) { |
| 176 | mm->iu.ue_ctx->rab_assign_addr_enc = |
| 177 | sgsn->cfg.iu.rab_assign_addr_enc; |
| 178 | } |
| 179 | } |
| 180 | #endif |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | /* Store BVCI/NSEI in MM context */ |
Pau Espin Pedrol | 35f0e66 | 2019-09-02 18:27:27 +0200 | [diff] [blame] | 184 | void mmctx2msgid(struct msgb *msg, const struct sgsn_mm_ctx *mm) |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 185 | { |
Harald Welte | f97ee04 | 2015-12-25 19:12:21 +0100 | [diff] [blame] | 186 | msgb_tlli(msg) = mm->gb.tlli; |
| 187 | msgb_bvci(msg) = mm->gb.bvci; |
| 188 | msgb_nsei(msg) = mm->gb.nsei; |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 189 | MSG_IU_UE_CTX_SET(msg, mm->iu.ue_ctx); |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 190 | } |
| 191 | |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 192 | static void mm_ctx_cleanup_free(struct sgsn_mm_ctx *ctx, const char *log_text) |
| 193 | { |
Jacob Erlbeck | e671d25 | 2015-01-26 14:43:07 +0100 | [diff] [blame] | 194 | LOGMMCTXP(LOGL_INFO, ctx, "Cleaning MM context due to %s\n", log_text); |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 195 | |
| 196 | /* Mark MM state as deregistered */ |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 197 | osmo_fsm_inst_dispatch(ctx->gmm_fsm, E_GMM_CLEANUP, NULL); |
Pau Espin Pedrol | 2179dec | 2019-08-13 19:09:32 +0200 | [diff] [blame] | 198 | |
| 199 | switch(ctx->ran_type) { |
| 200 | case MM_CTX_T_UTRAN_Iu: |
Pau Espin Pedrol | 888052e | 2021-04-14 13:27:34 +0200 | [diff] [blame] | 201 | osmo_fsm_inst_dispatch(ctx->iu.mm_state_fsm, E_PMM_PS_DETACH, NULL); |
Pau Espin Pedrol | 2179dec | 2019-08-13 19:09:32 +0200 | [diff] [blame] | 202 | break; |
| 203 | case MM_CTX_T_GERAN_Gb: |
Pau Espin Pedrol | 888052e | 2021-04-14 13:27:34 +0200 | [diff] [blame] | 204 | osmo_fsm_inst_dispatch(ctx->gb.mm_state_fsm, E_MM_GPRS_DETACH, NULL); |
Pau Espin Pedrol | 2179dec | 2019-08-13 19:09:32 +0200 | [diff] [blame] | 205 | break; |
| 206 | } |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 207 | |
Jacob Erlbeck | e671d25 | 2015-01-26 14:43:07 +0100 | [diff] [blame] | 208 | sgsn_mm_ctx_cleanup_free(ctx); |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 209 | } |
| 210 | |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 211 | /* Chapter 9.4.18 */ |
| 212 | static int _tx_status(struct msgb *msg, uint8_t cause, |
Pau Espin Pedrol | 35f0e66 | 2019-09-02 18:27:27 +0200 | [diff] [blame] | 213 | struct sgsn_mm_ctx *mmctx) |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 214 | { |
| 215 | struct gsm48_hdr *gh; |
| 216 | |
| 217 | /* MMCTX might be NULL! */ |
| 218 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 219 | DEBUGP(DMM, "<- GMM STATUS (cause: %s)\n", |
Jacob Erlbeck | afcf230 | 2015-01-05 17:30:02 +0100 | [diff] [blame] | 220 | get_value_string(gsm48_gmm_cause_names, cause)); |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 221 | |
| 222 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
Pau Espin Pedrol | 35f0e66 | 2019-09-02 18:27:27 +0200 | [diff] [blame] | 223 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 224 | gh->msg_type = GSM48_MT_GMM_STATUS; |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 225 | gh->data[0] = cause; |
| 226 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 227 | return gsm48_gmm_sendmsg(msg, 0, mmctx, true); |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 228 | } |
Jacob Erlbeck | 7067142 | 2014-10-29 22:57:30 +0100 | [diff] [blame] | 229 | |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 230 | static int gsm48_tx_gmm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) |
| 231 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 232 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 GMM STATUS"); |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 233 | |
| 234 | mmctx2msgid(msg, mmctx); |
Pau Espin Pedrol | 35f0e66 | 2019-09-02 18:27:27 +0200 | [diff] [blame] | 235 | return _tx_status(msg, cause, mmctx); |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 236 | } |
| 237 | |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 238 | static int _tx_detach_req(struct msgb *msg, uint8_t detach_type, uint8_t cause, |
| 239 | struct sgsn_mm_ctx *mmctx) |
| 240 | { |
| 241 | struct gsm48_hdr *gh; |
| 242 | |
| 243 | /* MMCTX might be NULL! */ |
| 244 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 245 | DEBUGP(DMM, "<- GMM DETACH REQ (type: %s, cause: %s)\n", |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 246 | get_value_string(gprs_det_t_mt_strs, detach_type), |
Jacob Erlbeck | afcf230 | 2015-01-05 17:30:02 +0100 | [diff] [blame] | 247 | get_value_string(gsm48_gmm_cause_names, cause)); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 248 | |
| 249 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 250 | |
| 251 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 252 | gh->msg_type = GSM48_MT_GMM_DETACH_REQ; |
| 253 | gh->data[0] = detach_type & 0x07; |
| 254 | |
| 255 | msgb_tv_put(msg, GSM48_IE_GMM_CAUSE, cause); |
| 256 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 257 | return gsm48_gmm_sendmsg(msg, 0, mmctx, true); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | static int gsm48_tx_gmm_detach_req(struct sgsn_mm_ctx *mmctx, |
| 261 | uint8_t detach_type, uint8_t cause) |
| 262 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 263 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET REQ"); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 264 | |
| 265 | mmctx2msgid(msg, mmctx); |
| 266 | return _tx_detach_req(msg, detach_type, cause, mmctx); |
| 267 | } |
| 268 | |
| 269 | static int gsm48_tx_gmm_detach_req_oldmsg(struct msgb *oldmsg, |
| 270 | uint8_t detach_type, uint8_t cause) |
| 271 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 272 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET OLD"); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 273 | |
| 274 | gmm_copy_id(msg, oldmsg); |
| 275 | return _tx_detach_req(msg, detach_type, cause, NULL); |
| 276 | } |
Harald Welte | f54e7e2 | 2010-06-09 10:51:23 +0200 | [diff] [blame] | 277 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 278 | /* Chapter 9.4.2: Attach accept */ |
Alexander Couzens | d4788cd | 2018-05-02 22:32:19 +0200 | [diff] [blame] | 279 | int gsm48_tx_gmm_att_ack(struct sgsn_mm_ctx *mm) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 280 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 281 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT ACK"); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 282 | struct gsm48_hdr *gh; |
| 283 | struct gsm48_attach_ack *aa; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 284 | unsigned long t; |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 285 | #ifdef PTMSI_ALLOC |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 286 | struct osmo_mobile_identity mi; |
| 287 | uint8_t *l; |
| 288 | int rc; |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 289 | #endif |
Holger Hans Peter Freyther | 1768a57 | 2014-04-04 12:40:34 +0200 | [diff] [blame] | 290 | #if 0 |
| 291 | uint8_t *ptsig; |
| 292 | #endif |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 293 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 294 | LOGMMCTXP(LOGL_INFO, mm, "<- GMM ATTACH ACCEPT (new P-TMSI=0x%08x)\n", mm->p_tmsi); |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 295 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ATTACH_ACKED)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 296 | |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 297 | mmctx2msgid(msg, mm); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 298 | |
| 299 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 300 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 301 | gh->msg_type = GSM48_MT_GMM_ATTACH_ACK; |
| 302 | |
| 303 | aa = (struct gsm48_attach_ack *) msgb_put(msg, sizeof(*aa)); |
| 304 | aa->force_stby = 0; /* not indicated */ |
| 305 | aa->att_result = 1; /* GPRS only */ |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 306 | t = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1); |
| 307 | aa->ra_upd_timer = gprs_secs_to_tmr_floor(t); |
Keith | 6d92f14 | 2020-09-21 00:09:30 +0200 | [diff] [blame] | 308 | aa->radio_prio = 0x44; /* lowest */ |
Max | 25c65c3 | 2018-01-08 14:43:53 +0100 | [diff] [blame] | 309 | gsm48_encode_ra(&aa->ra_id, &mm->ra); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 310 | |
Harald Welte | ab1d562 | 2010-05-18 19:58:38 +0200 | [diff] [blame] | 311 | #if 0 |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 312 | /* Optional: P-TMSI signature */ |
| 313 | msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); |
| 314 | ptsig = msgb_put(msg, 3); |
| 315 | ptsig[0] = mm->p_tmsi_sig >> 16; |
| 316 | ptsig[1] = mm->p_tmsi_sig >> 8; |
| 317 | ptsig[2] = mm->p_tmsi_sig & 0xff; |
| 318 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 319 | #endif |
Jacob Erlbeck | 8de9c48 | 2015-01-23 11:44:39 +0100 | [diff] [blame] | 320 | /* Optional: Negotiated Ready timer value |
| 321 | * (fixed 44s, default value, GSM 04.08, table 11.4a) to safely limit |
| 322 | * the inactivity time READY->STANDBY. |
| 323 | */ |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 324 | t = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1); |
| 325 | msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(t)); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 326 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 327 | #ifdef PTMSI_ALLOC |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 328 | /* Optional: Allocated P-TMSI */ |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 329 | mi = (struct osmo_mobile_identity){ |
| 330 | .type = GSM_MI_TYPE_TMSI, |
| 331 | .tmsi = mm->p_tmsi, |
| 332 | }; |
| 333 | l = msgb_tl_put(msg, GSM48_IE_GMM_ALLOC_PTMSI); |
| 334 | rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); |
| 335 | if (rc < 0) { |
| 336 | LOGMMCTXP(LOGL_ERROR, mm, "Cannot encode Mobile Identity\n"); |
| 337 | msgb_free(msg); |
| 338 | return -EINVAL; |
| 339 | } |
| 340 | *l = rc; |
Harald Welte | ab1d562 | 2010-05-18 19:58:38 +0200 | [diff] [blame] | 341 | #endif |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 342 | |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 343 | /* Optional: MS-identity (combined attach) */ |
| 344 | /* Optional: GMM cause (partial attach result for combined attach) */ |
| 345 | |
Pau Espin Pedrol | 83142be | 2020-11-26 19:34:04 +0100 | [diff] [blame] | 346 | /* Optional: Network feature support 10.5.5.23 */ |
| 347 | /* msgb_v_put(msg, GSM48_IE_GMM_NET_FEAT_SUPPORT | 0x00);*/ |
| 348 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 349 | return gsm48_gmm_sendmsg(msg, 0, mm, true); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /* Chapter 9.4.5: Attach reject */ |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 353 | static int _tx_gmm_att_rej(struct msgb *msg, uint8_t gmm_cause, |
| 354 | const struct sgsn_mm_ctx *mm) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 355 | { |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 356 | struct gsm48_hdr *gh; |
| 357 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 358 | LOGMMCTXP(LOGL_NOTICE, mm, "<- GMM ATTACH REJECT: %s\n", |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 359 | get_value_string(gsm48_gmm_cause_names, gmm_cause)); |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 360 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ATTACH_REJECTED)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 361 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 362 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 363 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 364 | gh->msg_type = GSM48_MT_GMM_ATTACH_REJ; |
| 365 | gh->data[0] = gmm_cause; |
| 366 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 367 | return gsm48_gmm_sendmsg(msg, 0, NULL, false); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 368 | } |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 369 | static int gsm48_tx_gmm_att_rej_oldmsg(const struct msgb *old_msg, |
| 370 | uint8_t gmm_cause) |
| 371 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 372 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ OLD"); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 373 | gmm_copy_id(msg, old_msg); |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 374 | return _tx_gmm_att_rej(msg, gmm_cause, NULL); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 375 | } |
Alexander Couzens | d4788cd | 2018-05-02 22:32:19 +0200 | [diff] [blame] | 376 | int gsm48_tx_gmm_att_rej(struct sgsn_mm_ctx *mm, |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 377 | uint8_t gmm_cause) |
| 378 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 379 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ATT REJ"); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 380 | mmctx2msgid(msg, mm); |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 381 | return _tx_gmm_att_rej(msg, gmm_cause, mm); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 382 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 383 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 384 | /* Chapter 9.4.6.2 Detach accept */ |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 385 | static int _tx_detach_ack(struct msgb *msg, uint8_t force_stby, |
| 386 | struct sgsn_mm_ctx *mm) |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 387 | { |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 388 | struct gsm48_hdr *gh; |
| 389 | |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 390 | /* MMCTX might be NULL! */ |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 391 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 392 | DEBUGP(DMM, "<- GMM DETACH ACC (force-standby: %d)\n", force_stby); |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 393 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_DETACH_ACKED)); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 394 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 395 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 396 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 397 | gh->msg_type = GSM48_MT_GMM_DETACH_ACK; |
| 398 | gh->data[0] = force_stby; |
| 399 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 400 | return gsm48_gmm_sendmsg(msg, 0, mm, true); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 401 | } |
| 402 | |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 403 | static int gsm48_tx_gmm_det_ack(struct sgsn_mm_ctx *mm, uint8_t force_stby) |
| 404 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 405 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK"); |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 406 | |
| 407 | mmctx2msgid(msg, mm); |
| 408 | return _tx_detach_ack(msg, force_stby, mm); |
| 409 | } |
| 410 | |
| 411 | static int gsm48_tx_gmm_det_ack_oldmsg(struct msgb *oldmsg, uint8_t force_stby) |
| 412 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 413 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 DET ACK OLD"); |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 414 | |
| 415 | gmm_copy_id(msg, oldmsg); |
| 416 | return _tx_detach_ack(msg, force_stby, NULL); |
| 417 | } |
| 418 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 419 | /* Transmit Chapter 9.4.12 Identity Request */ |
Alexander Couzens | d4788cd | 2018-05-02 22:32:19 +0200 | [diff] [blame] | 420 | int gsm48_tx_gmm_id_req(struct sgsn_mm_ctx *mm, uint8_t id_type) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 421 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 422 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 ID REQ"); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 423 | struct gsm48_hdr *gh; |
| 424 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 425 | LOGMMCTXP(LOGL_DEBUG, mm, "<- GMM IDENTITY REQUEST: mi_type=%s\n", |
Harald Welte | b9845f9 | 2015-08-16 18:07:48 +0200 | [diff] [blame] | 426 | gsm48_mi_type_name(id_type)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 427 | |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 428 | mmctx2msgid(msg, mm); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 429 | |
| 430 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 431 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 432 | gh->msg_type = GSM48_MT_GMM_ID_REQ; |
| 433 | /* 10.5.5.9 ID type 2 + identity type and 10.5.5.7 'force to standby' IE */ |
| 434 | gh->data[0] = id_type & 0xf; |
| 435 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 436 | return gsm48_gmm_sendmsg(msg, 1, mm, false); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 437 | } |
| 438 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 439 | /* determine if the MS/UE supports R99 or later */ |
| 440 | static bool mmctx_is_r99(const struct sgsn_mm_ctx *mm) |
| 441 | { |
| 442 | if (mm->ms_network_capa.len < 1) |
| 443 | return false; |
| 444 | if (mm->ms_network_capa.buf[0] & 0x01) |
| 445 | return true; |
| 446 | return false; |
| 447 | } |
| 448 | |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 449 | static enum gprs_ciph_algo gprs_ms_net_select_best_gea(uint8_t net_mask, uint8_t ms_mask) { |
| 450 | uint8_t common_mask = net_mask & ms_mask; |
| 451 | uint8_t r = 0; |
| 452 | |
| 453 | while (common_mask >>= 1) { |
| 454 | r++; |
| 455 | } |
| 456 | |
| 457 | return r; |
| 458 | } |
| 459 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 460 | /* 3GPP TS 24.008 § 9.4.9: Authentication and Ciphering Request */ |
Alexander Couzens | d4788cd | 2018-05-02 22:32:19 +0200 | [diff] [blame] | 461 | int gsm48_tx_gmm_auth_ciph_req(struct sgsn_mm_ctx *mm, |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 462 | const struct osmo_auth_vector *vec, |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 463 | uint8_t key_seq, bool force_standby) |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 464 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 465 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REQ"); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 466 | struct gsm48_hdr *gh; |
| 467 | struct gsm48_auth_ciph_req *acreq; |
Max | 4011e72 | 2016-07-05 15:19:12 +0200 | [diff] [blame] | 468 | uint8_t *m_rand, *m_cksn, rbyte; |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 469 | int rc; |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 470 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 471 | LOGMMCTXP(LOGL_INFO, mm, "<- GMM AUTH AND CIPHERING REQ (rand = %s," |
Neels Hofmeyr | 918a47b | 2018-04-30 21:59:34 +0200 | [diff] [blame] | 472 | " mmctx_is_r99=%d, vec->auth_types=0x%x", |
| 473 | osmo_hexdump(vec->rand, sizeof(vec->rand)), |
| 474 | mmctx_is_r99(mm), vec->auth_types); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 475 | if (mmctx_is_r99(mm) && vec |
| 476 | && (vec->auth_types & OSMO_AUTH_TYPE_UMTS)) { |
| 477 | LOGPC(DMM, LOGL_INFO, ", autn = %s)\n", |
| 478 | osmo_hexdump(vec->autn, sizeof(vec->autn))); |
| 479 | } else |
| 480 | LOGPC(DMM, LOGL_INFO, ")\n"); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 481 | |
| 482 | mmctx2msgid(msg, mm); |
| 483 | |
| 484 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 485 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 486 | gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_REQ; |
| 487 | |
| 488 | acreq = (struct gsm48_auth_ciph_req *) msgb_put(msg, sizeof(*acreq)); |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 489 | acreq->ciph_alg = mm->ciph_algo & 0xf; |
| 490 | /* § 10.5.5.10: */ |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 491 | acreq->imeisv_req = 0x1; |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 492 | /* § 10.5.5.7: */ |
| 493 | acreq->force_stby = force_standby; |
Max | 4011e72 | 2016-07-05 15:19:12 +0200 | [diff] [blame] | 494 | /* 3GPP TS 24.008 § 10.5.5.19: */ |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 495 | rc = osmo_get_rand_id(&rbyte, 1); |
| 496 | if (rc < 0) { |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 497 | LOGMMCTXP(LOGL_ERROR, mm, "osmo_get_rand_id() failed for A&C ref: %s\n", strerror(-rc)); |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 498 | return rc; |
| 499 | } |
| 500 | |
| 501 | acreq->ac_ref_nr = rbyte; |
Max | 4011e72 | 2016-07-05 15:19:12 +0200 | [diff] [blame] | 502 | mm->ac_ref_nr_used = acreq->ac_ref_nr; |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 503 | |
| 504 | /* Only if authentication is requested we need to set RAND + CKSN */ |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 505 | if (vec) { |
| 506 | m_rand = msgb_put(msg, sizeof(vec->rand) + 1); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 507 | m_rand[0] = GSM48_IE_GMM_AUTH_RAND; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 508 | memcpy(m_rand + 1, vec->rand, sizeof(vec->rand)); |
| 509 | |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 510 | /* § 10.5.1.2: */ |
Jacob Erlbeck | 65d8273 | 2014-12-01 10:36:17 +0100 | [diff] [blame] | 511 | m_cksn = msgb_put(msg, 1); |
| 512 | m_cksn[0] = (GSM48_IE_GMM_CIPH_CKSN << 4) | (key_seq & 0x07); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 513 | |
| 514 | /* A Release99 or higher MS/UE must be able to handle |
| 515 | * the optional AUTN IE. If a classic GSM SIM is |
| 516 | * inserted, it will simply ignore AUTN and just use |
| 517 | * RAND */ |
| 518 | if (mmctx_is_r99(mm) && |
| 519 | (vec->auth_types & OSMO_AUTH_TYPE_UMTS)) { |
| 520 | msgb_tlv_put(msg, GSM48_IE_GMM_AUTN, |
| 521 | sizeof(vec->autn), vec->autn); |
| 522 | } |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 523 | } |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 524 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 525 | return gsm48_gmm_sendmsg(msg, 1, mm, false); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 526 | } |
| 527 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 528 | /* 3GPP TS 24.008 § 9.4.11: Authentication and Ciphering Reject */ |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 529 | static int gsm48_tx_gmm_auth_ciph_rej(struct sgsn_mm_ctx *mm) |
| 530 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 531 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 AUTH CIPH REJ"); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 532 | struct gsm48_hdr *gh; |
| 533 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 534 | LOGMMCTXP(LOGL_NOTICE, mm, "<- GMM AUTH AND CIPH REJECT\n"); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 535 | |
| 536 | mmctx2msgid(msg, mm); |
| 537 | |
| 538 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 539 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 540 | gh->msg_type = GSM48_MT_GMM_AUTH_CIPH_REJ; |
| 541 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 542 | return gsm48_gmm_sendmsg(msg, 0, mm, false); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 543 | } |
| 544 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 545 | /* check if the received authentication response matches */ |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 546 | static enum osmo_sub_auth_type check_auth_resp(struct sgsn_mm_ctx *ctx, |
| 547 | bool is_utran, |
| 548 | const struct osmo_auth_vector *vec, |
| 549 | const uint8_t *res, uint8_t res_len) |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 550 | { |
| 551 | const uint8_t *expect_res; |
| 552 | uint8_t expect_res_len; |
| 553 | enum osmo_sub_auth_type expect_type; |
| 554 | const char *expect_str; |
| 555 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 556 | /* On UTRAN (3G) we always expect UMTS AKA. On GERAN (2G) we sent AUTN |
| 557 | * and expect UMTS AKA if there is R99 capability and our vector |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 558 | * supports UMTS AKA, otherwise we expect GSM AKA. |
| 559 | * However, on GERAN, even if we sent a UMTS AKA Authentication Request, the MS may decide to |
| 560 | * instead reply with a GSM AKA SRES response. */ |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 561 | if (is_utran |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 562 | || (mmctx_is_r99(ctx) && (vec->auth_types & OSMO_AUTH_TYPE_UMTS) |
| 563 | && (res_len > sizeof(vec->sres)))) { |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 564 | expect_type = OSMO_AUTH_TYPE_UMTS; |
| 565 | expect_str = "UMTS RES"; |
| 566 | expect_res = vec->res; |
| 567 | expect_res_len = vec->res_len; |
| 568 | } else { |
| 569 | expect_type = OSMO_AUTH_TYPE_GSM; |
| 570 | expect_str = "GSM SRES"; |
| 571 | expect_res = vec->sres; |
| 572 | expect_res_len = sizeof(vec->sres); |
| 573 | } |
Pau Espin Pedrol | d04e669 | 2018-01-07 18:14:12 +0100 | [diff] [blame] | 574 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 575 | if (!(vec->auth_types & expect_type)) { |
| 576 | LOGMMCTXP(LOGL_ERROR, ctx, "Auth error: auth vector does" |
| 577 | " not provide the expected auth type:" |
| 578 | " expected %s = 0x%x, auth_types are 0x%x\n", |
| 579 | expect_str, expect_type, vec->auth_types); |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 580 | return OSMO_AUTH_TYPE_NONE; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 581 | } |
| 582 | |
| 583 | if (!res) |
| 584 | goto auth_mismatch; |
| 585 | |
| 586 | if (res_len != expect_res_len) |
| 587 | goto auth_mismatch; |
| 588 | |
| 589 | if (memcmp(res, expect_res, res_len) != 0) |
| 590 | goto auth_mismatch; |
| 591 | |
| 592 | /* Authorized! */ |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 593 | return expect_type; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 594 | |
| 595 | auth_mismatch: |
| 596 | LOGMMCTXP(LOGL_ERROR, ctx, "Auth mismatch: expected %s = %s\n", |
| 597 | expect_str, osmo_hexdump_nospc(expect_res, expect_res_len)); |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 598 | return OSMO_AUTH_TYPE_NONE; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 599 | } |
| 600 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 601 | /* 3GPP TS 24.008 § 9.4.10: Authentication and Ciphering Response */ |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 602 | static int gsm48_rx_gmm_auth_ciph_resp(struct sgsn_mm_ctx *ctx, |
| 603 | struct msgb *msg) |
| 604 | { |
| 605 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| 606 | struct gsm48_auth_ciph_resp *acr = (struct gsm48_auth_ciph_resp *)gh->data; |
| 607 | struct tlv_parsed tp; |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 608 | struct gsm_auth_tuple *at; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 609 | const char *res_name = "(no response)"; |
| 610 | uint8_t res[16]; |
| 611 | uint8_t res_len; |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 612 | int rc; |
| 613 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 614 | LOGMMCTXP(LOGL_INFO, ctx, "-> GMM AUTH AND CIPH RESPONSE\n"); |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 615 | |
| 616 | if (ctx->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { |
| 617 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 618 | "Unexpected Auth & Ciph Response (ignored)\n"); |
| 619 | return 0; |
| 620 | } |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 621 | |
Max | 4011e72 | 2016-07-05 15:19:12 +0200 | [diff] [blame] | 622 | if (acr->ac_ref_nr != ctx->ac_ref_nr_used) { |
| 623 | LOGMMCTXP(LOGL_NOTICE, ctx, "Reference mismatch for Auth & Ciph" |
| 624 | " Response: %u received, %u expected\n", |
| 625 | acr->ac_ref_nr, ctx->ac_ref_nr_used); |
| 626 | return 0; |
| 627 | } |
| 628 | |
Jacob Erlbeck | bd0cf11 | 2014-12-01 12:33:33 +0100 | [diff] [blame] | 629 | /* Stop T3360 */ |
| 630 | mmctx_timer_stop(ctx, 3360); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 631 | |
Holger Hans Peter Freyther | 1768a57 | 2014-04-04 12:40:34 +0200 | [diff] [blame] | 632 | tlv_parse(&tp, &gsm48_gmm_att_tlvdef, acr->data, |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 633 | (msg->data + msg->len) - acr->data, 0, 0); |
| 634 | |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 635 | if (!TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_SRES) || |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 636 | !TLVP_PRESENT(&tp, GSM48_IE_GMM_IMEISV) || |
| 637 | TLVP_LEN(&tp,GSM48_IE_GMM_AUTH_SRES) != 4) { |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 638 | /* TODO: missing mandatory IE, return STATUS or REJ? */ |
| 639 | LOGMMCTXP(LOGL_ERROR, ctx, "Missing mandantory IE\n"); |
| 640 | return -EINVAL; |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 641 | } |
| 642 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 643 | /* Start with the good old 4-byte SRES */ |
| 644 | memcpy(res, TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_SRES), 4); |
| 645 | res_len = 4; |
| 646 | res_name = "GSM SRES"; |
| 647 | |
| 648 | /* Append extended RES as part of UMTS AKA, if any */ |
| 649 | if (TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_RES_EXT)) { |
| 650 | unsigned int l = TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_RES_EXT); |
| 651 | if (l > sizeof(res)-4) |
| 652 | l = sizeof(res)-4; |
| 653 | memcpy(res+4, TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_RES_EXT), l); |
| 654 | res_len += l; |
| 655 | res_name = "UMTS RES"; |
| 656 | } |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 657 | |
| 658 | at = &ctx->auth_triplet; |
| 659 | |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 660 | LOGMMCTXP(LOGL_DEBUG, ctx, "checking auth: received %s = %s\n", |
| 661 | res_name, osmo_hexdump(res, res_len)); |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 662 | ctx->sec_ctx = check_auth_resp(ctx, false, &at->vec, res, res_len); |
| 663 | if (!sgsn_mm_ctx_is_authenticated(ctx)) { |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 664 | rc = gsm48_tx_gmm_auth_ciph_rej(ctx); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 665 | mm_ctx_cleanup_free(ctx, "GMM AUTH AND CIPH REJECT"); |
Jacob Erlbeck | 8ff3fb0 | 2014-12-01 12:44:24 +0100 | [diff] [blame] | 666 | return rc; |
| 667 | } |
| 668 | |
Daniel Willmann | 3ecfbbb | 2016-05-21 00:16:55 +0200 | [diff] [blame] | 669 | if (ctx->ran_type == MM_CTX_T_UTRAN_Iu) |
| 670 | ctx->iu.new_key = 1; |
| 671 | |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 672 | /* FIXME: enable LLC cipheirng */ |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 673 | |
| 674 | /* Check if we can let the mobile station enter */ |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 675 | return osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_AUTH_RESP_RECV_SUCCESS, NULL); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 676 | } |
| 677 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 678 | /* 3GPP TS 24.008 § 9.4.10: Authentication and Ciphering Failure */ |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 679 | static int gsm48_rx_gmm_auth_ciph_fail(struct sgsn_mm_ctx *ctx, |
| 680 | struct msgb *msg) |
| 681 | { |
| 682 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| 683 | struct tlv_parsed tp; |
| 684 | const uint8_t gmm_cause = gh->data[0]; |
| 685 | const uint8_t *auts; |
| 686 | int rc; |
| 687 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 688 | LOGMMCTXP(LOGL_INFO, ctx, "-> GMM AUTH AND CIPH FAILURE (cause = %s)\n", |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 689 | get_value_string(gsm48_gmm_cause_names, gmm_cause)); |
| 690 | |
| 691 | tlv_parse(&tp, &gsm48_gmm_att_tlvdef, gh->data+1, msg->len - 1, 0, 0); |
| 692 | |
| 693 | /* Only if GMM cause is present and the AUTS is provided, we can |
| 694 | * start re-sync procedure */ |
| 695 | if (gmm_cause == GMM_CAUSE_SYNC_FAIL && |
| 696 | TLVP_PRESENT(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR)) { |
| 697 | if (TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR) != 14) { |
| 698 | LOGMMCTXP(LOGL_ERROR, ctx, "AUTS IE has wrong size:" |
| 699 | " expected %d, got %u\n", 14, |
| 700 | TLVP_LEN(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR)); |
| 701 | return -EINVAL; |
| 702 | } |
| 703 | auts = TLVP_VAL(&tp, GSM48_IE_GMM_AUTH_FAIL_PAR); |
| 704 | |
| 705 | LOGMMCTXP(LOGL_INFO, ctx, |
| 706 | "R99 AUTHENTICATION SYNCH (AUTS = %s)\n", |
| 707 | osmo_hexdump_nospc(auts, 14)); |
| 708 | |
| 709 | /* make sure we'll refresh the auth_triplet in |
| 710 | * sgsn_auth_update() */ |
| 711 | ctx->auth_triplet.key_seq = GSM_KEY_SEQ_INVAL; |
| 712 | |
| 713 | /* make sure we'll retry authentication after the resync */ |
| 714 | ctx->auth_state = SGSN_AUTH_UMTS_RESYNC; |
| 715 | |
| 716 | /* Send AUTS to HLR and wait for new Auth Info Result */ |
| 717 | rc = gprs_subscr_request_auth_info(ctx, auts, |
| 718 | ctx->auth_triplet.vec.rand); |
| 719 | if (!rc) |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 720 | return osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_AUTH_RESP_RECV_RESYNC, NULL); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 721 | /* on error, fall through to send a reject */ |
| 722 | LOGMMCTXP(LOGL_ERROR, ctx, |
| 723 | "Sending AUTS to HLR failed (rc = %d)\n", rc); |
| 724 | } |
| 725 | |
| 726 | LOGMMCTXP(LOGL_NOTICE, ctx, "Authentication failed\n"); |
| 727 | rc = gsm48_tx_gmm_auth_ciph_rej(ctx); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 728 | mm_ctx_cleanup_free(ctx, "GMM AUTH FAILURE"); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 729 | return rc; |
| 730 | } |
| 731 | |
Alexander Couzens | 8007be4 | 2018-05-14 06:48:24 +0200 | [diff] [blame] | 732 | void extract_subscr_msisdn(struct sgsn_mm_ctx *ctx) |
Holger Hans Peter Freyther | 20de3ae | 2015-05-05 22:52:40 +0200 | [diff] [blame] | 733 | { |
| 734 | struct gsm_mncc_number called; |
| 735 | uint8_t msisdn[sizeof(ctx->subscr->sgsn_data->msisdn) + 1]; |
| 736 | |
| 737 | /* Convert MSISDN from encoded to string.. */ |
| 738 | if (!ctx->subscr) |
| 739 | return; |
| 740 | |
| 741 | if (ctx->subscr->sgsn_data->msisdn_len < 1) |
| 742 | return; |
| 743 | |
| 744 | /* prepare the data for the decoder */ |
| 745 | memset(&called, 0, sizeof(called)); |
| 746 | msisdn[0] = ctx->subscr->sgsn_data->msisdn_len; |
| 747 | memcpy(&msisdn[1], ctx->subscr->sgsn_data->msisdn, |
| 748 | ctx->subscr->sgsn_data->msisdn_len); |
| 749 | |
| 750 | /* decode the string now */ |
| 751 | gsm48_decode_called(&called, msisdn); |
| 752 | |
| 753 | /* Prepend a '+' for international numbers */ |
| 754 | if (called.plan == 1 && called.type == 1) { |
| 755 | ctx->msisdn[0] = '+'; |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 756 | osmo_strlcpy(&ctx->msisdn[1], called.number, |
| 757 | sizeof(ctx->msisdn)); |
Holger Hans Peter Freyther | 20de3ae | 2015-05-05 22:52:40 +0200 | [diff] [blame] | 758 | } else { |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 759 | osmo_strlcpy(ctx->msisdn, called.number, sizeof(ctx->msisdn)); |
Holger Hans Peter Freyther | 20de3ae | 2015-05-05 22:52:40 +0200 | [diff] [blame] | 760 | } |
| 761 | } |
| 762 | |
Alexander Couzens | 8007be4 | 2018-05-14 06:48:24 +0200 | [diff] [blame] | 763 | void extract_subscr_hlr(struct sgsn_mm_ctx *ctx) |
Holger Hans Peter Freyther | 8ee13e2 | 2015-05-18 10:00:03 +0200 | [diff] [blame] | 764 | { |
| 765 | struct gsm_mncc_number called; |
| 766 | uint8_t hlr_number[sizeof(ctx->subscr->sgsn_data->hlr) + 1]; |
| 767 | |
| 768 | if (!ctx->subscr) |
| 769 | return; |
| 770 | |
| 771 | if (ctx->subscr->sgsn_data->hlr_len < 1) |
| 772 | return; |
| 773 | |
| 774 | /* prepare the data for the decoder */ |
| 775 | memset(&called, 0, sizeof(called)); |
| 776 | hlr_number[0] = ctx->subscr->sgsn_data->hlr_len; |
| 777 | memcpy(&hlr_number[1], ctx->subscr->sgsn_data->hlr, |
| 778 | ctx->subscr->sgsn_data->hlr_len); |
| 779 | |
| 780 | /* decode the string now */ |
| 781 | gsm48_decode_called(&called, hlr_number); |
| 782 | |
| 783 | if (called.plan != 1) { |
| 784 | LOGMMCTXP(LOGL_ERROR, ctx, |
| 785 | "Numbering plan(%d) not allowed\n", |
| 786 | called.plan); |
| 787 | return; |
| 788 | } |
| 789 | |
| 790 | if (called.type != 1) { |
| 791 | LOGMMCTXP(LOGL_ERROR, ctx, |
| 792 | "Numbering type(%d) not allowed\n", |
| 793 | called.type); |
| 794 | return; |
| 795 | } |
| 796 | |
Neels Hofmeyr | 93bafb6 | 2017-01-13 03:12:08 +0100 | [diff] [blame] | 797 | osmo_strlcpy(ctx->hlr, called.number, sizeof(ctx->hlr)); |
Holger Hans Peter Freyther | 8ee13e2 | 2015-05-18 10:00:03 +0200 | [diff] [blame] | 798 | } |
| 799 | |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 800 | #ifdef BUILD_IU |
| 801 | /* Chapter 9.4.21: Service accept */ |
| 802 | static int gsm48_tx_gmm_service_ack(struct sgsn_mm_ctx *mm) |
| 803 | { |
| 804 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE ACK"); |
| 805 | struct gsm48_hdr *gh; |
| 806 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 807 | LOGMMCTXP(LOGL_INFO, mm, "<- GMM SERVICE ACCEPT (P-TMSI=0x%08x)\n", mm->p_tmsi); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 808 | |
| 809 | mmctx2msgid(msg, mm); |
| 810 | |
| 811 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 812 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 813 | gh->msg_type = GSM48_MT_GMM_SERVICE_ACK; |
| 814 | |
| 815 | /* Optional: PDP context status */ |
| 816 | /* Optional: MBMS context status */ |
| 817 | |
| 818 | return gsm48_gmm_sendmsg(msg, 0, mm, false); |
| 819 | } |
| 820 | #endif |
| 821 | |
| 822 | /* Chapter 9.4.22: Service reject */ |
| 823 | static int _tx_gmm_service_rej(struct msgb *msg, uint8_t gmm_cause, |
| 824 | const struct sgsn_mm_ctx *mm) |
| 825 | { |
| 826 | struct gsm48_hdr *gh; |
| 827 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 828 | LOGMMCTXP(LOGL_NOTICE, mm, "<- GMM SERVICE REJECT: %s\n", |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 829 | get_value_string(gsm48_gmm_cause_names, gmm_cause)); |
| 830 | |
| 831 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); |
| 832 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 833 | gh->msg_type = GSM48_MT_GMM_SERVICE_REJ; |
| 834 | gh->data[0] = gmm_cause; |
| 835 | |
| 836 | return gsm48_gmm_sendmsg(msg, 0, NULL, true); |
| 837 | } |
| 838 | static int gsm48_tx_gmm_service_rej_oldmsg(const struct msgb *old_msg, |
| 839 | uint8_t gmm_cause) |
| 840 | { |
| 841 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ OLD"); |
| 842 | gmm_copy_id(msg, old_msg); |
| 843 | return _tx_gmm_service_rej(msg, gmm_cause, NULL); |
| 844 | } |
| 845 | #if 0 |
| 846 | -- currently unused -- |
| 847 | static int gsm48_tx_gmm_service_rej(struct sgsn_mm_ctx *mm, |
| 848 | uint8_t gmm_cause) |
| 849 | { |
| 850 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SERVICE REJ"); |
| 851 | mmctx2msgid(msg, mm); |
| 852 | return _tx_gmm_service_rej(msg, gmm_cause, mm); |
| 853 | } |
| 854 | #endif |
| 855 | |
| 856 | static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm); |
| 857 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 858 | /* Check if we can already authorize a subscriber */ |
Pau Espin Pedrol | 6dfb5fe | 2019-08-29 17:21:00 +0200 | [diff] [blame] | 859 | int gsm48_gmm_authorize(struct sgsn_mm_ctx *ctx) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 860 | { |
Daniel Willmann | 3ecfbbb | 2016-05-21 00:16:55 +0200 | [diff] [blame] | 861 | #ifdef BUILD_IU |
| 862 | int rc; |
| 863 | #endif |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 864 | #ifndef PTMSI_ALLOC |
| 865 | struct sgsn_signal_data sig_data; |
| 866 | #endif |
| 867 | |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 868 | /* Request IMSI and IMEI from the MS if they are unknown */ |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 869 | if (!strlen(ctx->imei)) { |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 870 | ctx->t3370_id_type = GSM_MI_TYPE_IMEI; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 871 | mmctx_timer_start(ctx, 3370); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 872 | return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMEI); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 873 | } |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 874 | if (!strlen(ctx->imsi)) { |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 875 | ctx->t3370_id_type = GSM_MI_TYPE_IMSI; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 876 | mmctx_timer_start(ctx, 3370); |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 877 | return gsm48_tx_gmm_id_req(ctx, GSM_MI_TYPE_IMSI); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 878 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 879 | |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 880 | /* All information required for authentication is available */ |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 881 | ctx->t3370_id_type = GSM_MI_TYPE_NONE; |
| 882 | |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 883 | if (ctx->auth_state == SGSN_AUTH_UNKNOWN) { |
| 884 | /* Request authorization, this leads to a call to |
Jacob Erlbeck | f951a01 | 2014-11-07 14:17:44 +0100 | [diff] [blame] | 885 | * sgsn_auth_update which in turn calls |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 886 | * gsm0408_gprs_access_granted or gsm0408_gprs_access_denied */ |
| 887 | |
Jacob Erlbeck | a0b6efb | 2014-11-13 10:48:39 +0100 | [diff] [blame] | 888 | sgsn_auth_request(ctx); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 889 | /* Note that gsm48_gmm_authorize can be called recursively via |
| 890 | * sgsn_auth_request iff ctx->auth_info changes to AUTH_ACCEPTED |
| 891 | */ |
| 892 | return 0; |
| 893 | } |
| 894 | |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 895 | if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE |
| 896 | && !sgsn_mm_ctx_is_authenticated(ctx)) { |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 897 | struct gsm_auth_tuple *at = &ctx->auth_triplet; |
| 898 | |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 899 | mmctx_timer_start(ctx, 3360); |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 900 | return gsm48_tx_gmm_auth_ciph_req(ctx, &at->vec, at->key_seq, |
| 901 | false); |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 902 | } |
| 903 | |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 904 | if (ctx->auth_state == SGSN_AUTH_AUTHENTICATE && sgsn_mm_ctx_is_authenticated(ctx) && |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 905 | ctx->auth_triplet.key_seq != GSM_KEY_SEQ_INVAL) { |
| 906 | /* Check again for authorization */ |
| 907 | sgsn_auth_request(ctx); |
| 908 | return 0; |
| 909 | } |
| 910 | |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 911 | if (ctx->auth_state != SGSN_AUTH_ACCEPTED) { |
| 912 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 913 | "authorization is denied, aborting procedure\n"); |
| 914 | return -EACCES; |
Jacob Erlbeck | 0c06f98 | 2014-10-29 22:12:20 +0100 | [diff] [blame] | 915 | } |
| 916 | |
| 917 | /* The MS is authorized */ |
Daniel Willmann | 3ecfbbb | 2016-05-21 00:16:55 +0200 | [diff] [blame] | 918 | #ifdef BUILD_IU |
| 919 | if (ctx->ran_type == MM_CTX_T_UTRAN_Iu && !ctx->iu.ue_ctx->integrity_active) { |
Neels Hofmeyr | 3c7656a | 2022-03-07 15:38:59 +0100 | [diff] [blame] | 920 | /* Is any encryption above UEA0 enabled? */ |
| 921 | bool send_ck = sgsn->cfg.uea_encryption_mask > (1 << OSMO_UTRAN_UEA0); |
| 922 | LOGMMCTXP(LOGL_DEBUG, ctx, "Iu Security Mode Command: %s encryption key (UEA encryption mask = 0x%x)\n", |
| 923 | send_ck ? "sending" : "not sending", sgsn->cfg.uea_encryption_mask); |
| 924 | /* FIXME: we should send the set of allowed UEA, as in ranap_new_msg_sec_mod_cmd2(). However, this |
| 925 | * is not possible in the iu_client API. See OS#5487. */ |
| 926 | rc = ranap_iu_tx_sec_mode_cmd(ctx->iu.ue_ctx, &ctx->auth_triplet.vec, send_ck, ctx->iu.new_key); |
Daniel Willmann | 3ecfbbb | 2016-05-21 00:16:55 +0200 | [diff] [blame] | 927 | ctx->iu.new_key = 0; |
| 928 | return rc; |
| 929 | } |
| 930 | #endif |
Jacob Erlbeck | 0c06f98 | 2014-10-29 22:12:20 +0100 | [diff] [blame] | 931 | |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 932 | switch (ctx->pending_req) { |
| 933 | case 0: |
| 934 | LOGMMCTXP(LOGL_INFO, ctx, |
| 935 | "no pending request, authorization completed\n"); |
| 936 | break; |
| 937 | case GSM48_MT_GMM_ATTACH_REQ: |
Daniel Willmann | fac9758 | 2016-05-21 00:21:15 +0200 | [diff] [blame] | 938 | ctx->pending_req = 0; |
Holger Hans Peter Freyther | 20de3ae | 2015-05-05 22:52:40 +0200 | [diff] [blame] | 939 | |
| 940 | extract_subscr_msisdn(ctx); |
Holger Hans Peter Freyther | 8ee13e2 | 2015-05-18 10:00:03 +0200 | [diff] [blame] | 941 | extract_subscr_hlr(ctx); |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 942 | #ifdef PTMSI_ALLOC |
| 943 | /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 944 | mmctx_timer_start(ctx, 3350); |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 945 | ctx->t3350_mode = GMM_T3350_MODE_ATT; |
Jacob Erlbeck | 0074a77 | 2014-10-28 16:23:46 +0100 | [diff] [blame] | 946 | #else |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 947 | memset(&sig_data, 0, sizeof(sig_data)); |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 948 | sig_data.mm = ctx; |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 949 | osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 950 | osmo_fsm_inst_dispatch(ctx->gmm_fsm, E_GMM_ATTACH_SUCCESS, NULL); |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 951 | #endif |
| 952 | |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 953 | return gsm48_tx_gmm_att_ack(ctx); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 954 | #ifdef BUILD_IU |
| 955 | case GSM48_MT_GMM_SERVICE_REQ: |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 956 | ctx->pending_req = 0; |
Pau Espin Pedrol | c67c90b | 2021-03-25 17:49:37 +0100 | [diff] [blame] | 957 | osmo_fsm_inst_dispatch(ctx->iu.mm_state_fsm, E_PMM_PS_CONN_ESTABLISH, NULL); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 958 | rc = gsm48_tx_gmm_service_ack(ctx); |
| 959 | |
Daniel Willmann | af24172 | 2016-05-21 00:35:41 +0200 | [diff] [blame] | 960 | if (ctx->iu.service.type != GPRS_SERVICE_T_SIGNALLING) |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 961 | activate_pdp_rabs(ctx); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 962 | |
| 963 | return rc; |
| 964 | #endif |
| 965 | case GSM48_MT_GMM_RA_UPD_REQ: |
| 966 | ctx->pending_req = 0; |
| 967 | /* Send RA UPDATE ACCEPT */ |
| 968 | return gsm48_tx_gmm_ra_upd_ack(ctx); |
| 969 | |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 970 | default: |
| 971 | LOGMMCTXP(LOGL_ERROR, ctx, |
| 972 | "only Attach Request is supported yet, " |
| 973 | "got request type %u\n", ctx->pending_req); |
| 974 | break; |
| 975 | } |
| 976 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 977 | return 0; |
| 978 | } |
| 979 | |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 980 | void gsm0408_gprs_authenticate(struct sgsn_mm_ctx *ctx) |
| 981 | { |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 982 | ctx->sec_ctx = OSMO_AUTH_TYPE_NONE; |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 983 | |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 984 | if (ctx->gmm_att_req.fsm->state != ST_INIT) |
| 985 | osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_VLR_ANSWERED, (void *) 0); |
| 986 | else |
| 987 | gsm48_gmm_authorize(ctx); |
Jacob Erlbeck | 4adb136 | 2014-12-02 09:47:26 +0100 | [diff] [blame] | 988 | } |
| 989 | |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 990 | void gsm0408_gprs_access_granted(struct sgsn_mm_ctx *ctx) |
| 991 | { |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 992 | switch (ctx->gmm_fsm->state) { |
| 993 | case ST_GMM_COMMON_PROC_INIT: |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 994 | LOGMMCTXP(LOGL_NOTICE, ctx, |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 995 | "Authorized, continuing procedure, IMSI=%s\n", |
| 996 | ctx->imsi); |
| 997 | /* Continue with the authorization */ |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 998 | if (ctx->gmm_att_req.fsm->state != ST_INIT) |
| 999 | osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_VLR_ANSWERED, (void *) 0); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1000 | break; |
| 1001 | default: |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 1002 | LOGMMCTXP(LOGL_INFO, ctx, |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1003 | "Authorized, ignored, IMSI=%s\n", |
| 1004 | ctx->imsi); |
| 1005 | } |
| 1006 | } |
| 1007 | |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1008 | void gsm0408_gprs_access_denied(struct sgsn_mm_ctx *ctx, int gmm_cause) |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1009 | { |
Jacob Erlbeck | d6267d1 | 2015-01-19 11:10:04 +0100 | [diff] [blame] | 1010 | if (gmm_cause == SGSN_ERROR_CAUSE_NONE) |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1011 | gmm_cause = GMM_CAUSE_GPRS_NOTALLOWED; |
| 1012 | |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1013 | switch (ctx->gmm_fsm->state) { |
| 1014 | case ST_GMM_COMMON_PROC_INIT: |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1015 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 1016 | "Not authorized, rejecting ATTACH REQUEST " |
| 1017 | "with cause '%s' (%d)\n", |
| 1018 | get_value_string(gsm48_gmm_cause_names, gmm_cause), |
| 1019 | gmm_cause); |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 1020 | if (ctx->gmm_att_req.fsm->state != ST_INIT) |
| 1021 | osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_REJECT, (void *) (long) gmm_cause); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1022 | break; |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1023 | case ST_GMM_REGISTERED_NORMAL: |
| 1024 | case ST_GMM_REGISTERED_SUSPENDED: |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1025 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 1026 | "Authorization lost, detaching " |
| 1027 | "with cause '%s' (%d)\n", |
| 1028 | get_value_string(gsm48_gmm_cause_names, gmm_cause), |
| 1029 | gmm_cause); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1030 | gsm48_tx_gmm_detach_req( |
Alexander Couzens | 13c1312 | 2018-05-22 20:28:18 +0200 | [diff] [blame] | 1031 | ctx, GPRS_DET_T_MT_IMSI, gmm_cause); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1032 | |
| 1033 | mm_ctx_cleanup_free(ctx, "auth lost"); |
| 1034 | break; |
| 1035 | default: |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1036 | LOGMMCTXP(LOGL_INFO, ctx, |
| 1037 | "Authorization lost, cause is '%s' (%d)\n", |
| 1038 | get_value_string(gsm48_gmm_cause_names, gmm_cause), |
| 1039 | gmm_cause); |
| 1040 | mm_ctx_cleanup_free(ctx, "auth lost"); |
Jacob Erlbeck | 423f8bf | 2014-10-24 18:09:54 +0200 | [diff] [blame] | 1041 | } |
| 1042 | } |
| 1043 | |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1044 | void gsm0408_gprs_access_cancelled(struct sgsn_mm_ctx *ctx, int gmm_cause) |
Jacob Erlbeck | 98647ca | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 1045 | { |
Jacob Erlbeck | d6267d1 | 2015-01-19 11:10:04 +0100 | [diff] [blame] | 1046 | if (gmm_cause != SGSN_ERROR_CAUSE_NONE) { |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1047 | LOGMMCTXP(LOGL_INFO, ctx, |
| 1048 | "Cancelled with cause '%s' (%d), deleting context\n", |
| 1049 | get_value_string(gsm48_gmm_cause_names, gmm_cause), |
| 1050 | gmm_cause); |
| 1051 | gsm0408_gprs_access_denied(ctx, gmm_cause); |
| 1052 | return; |
Jacob Erlbeck | 98647ca | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 1053 | } |
Jacob Erlbeck | af3d5c5 | 2015-01-05 17:51:17 +0100 | [diff] [blame] | 1054 | |
| 1055 | LOGMMCTXP(LOGL_INFO, ctx, "Cancelled, deleting context silently\n"); |
Jacob Erlbeck | 98647ca | 2014-11-11 14:47:38 +0100 | [diff] [blame] | 1056 | mm_ctx_cleanup_free(ctx, "access cancelled"); |
| 1057 | } |
| 1058 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1059 | /* Parse Chapter 9.4.13 Identity Response */ |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 1060 | static int gsm48_rx_gmm_id_resp(struct sgsn_mm_ctx *ctx, struct msgb *msg) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1061 | { |
Harald Welte | 943c5bc | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 1062 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1063 | long mi_typel; |
| 1064 | char mi_log_string[32]; |
| 1065 | struct osmo_mobile_identity mi; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1066 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1067 | if (!ctx) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1068 | DEBUGP(DMM, "from unknown TLLI 0x%08x?!? This should not happen\n", msgb_tlli(msg)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1069 | return -EINVAL; |
| 1070 | } |
| 1071 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1072 | if (osmo_mobile_identity_decode(&mi, &gh->data[1], gh->data[0], false)) { |
| 1073 | LOGMMCTXP(LOGL_ERROR, ctx, "-> GMM IDENTITY RESPONSE: cannot decode Mobile Identity\n"); |
| 1074 | return -EINVAL; |
| 1075 | } |
| 1076 | osmo_mobile_identity_to_str_buf(mi_log_string, sizeof(mi_log_string), &mi); |
| 1077 | |
| 1078 | LOGMMCTXP(LOGL_DEBUG, ctx, "-> GMM IDENTITY RESPONSE: MI=%s\n", mi_log_string); |
Daniel Willmann | f8070f4 | 2014-09-23 18:48:44 +0200 | [diff] [blame] | 1079 | |
Jacob Erlbeck | fb26c60 | 2014-10-22 12:20:26 +0200 | [diff] [blame] | 1080 | if (ctx->t3370_id_type == GSM_MI_TYPE_NONE) { |
| 1081 | LOGMMCTXP(LOGL_NOTICE, ctx, |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1082 | "Got unexpected IDENTITY RESPONSE: MI=%s, " |
Jacob Erlbeck | fb26c60 | 2014-10-22 12:20:26 +0200 | [diff] [blame] | 1083 | "ignoring message\n", |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1084 | mi_log_string); |
Jacob Erlbeck | fb26c60 | 2014-10-22 12:20:26 +0200 | [diff] [blame] | 1085 | return -EINVAL; |
| 1086 | } |
| 1087 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1088 | if (mi.type == ctx->t3370_id_type) |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1089 | mmctx_timer_stop(ctx, 3370); |
| 1090 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1091 | switch (mi.type) { |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1092 | case GSM_MI_TYPE_IMSI: |
| 1093 | /* we already have a mm context with current TLLI, but no |
| 1094 | * P-TMSI / IMSI yet. What we now need to do is to fill |
| 1095 | * this initial context with data from the HLR */ |
Harald Welte | c728eea | 2010-12-24 23:07:18 +0100 | [diff] [blame] | 1096 | if (strlen(ctx->imsi) == 0) { |
| 1097 | /* Check if we already have a MM context for this IMSI */ |
| 1098 | struct sgsn_mm_ctx *ictx; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1099 | ictx = sgsn_mm_ctx_by_imsi(mi.imsi); |
Harald Welte | c728eea | 2010-12-24 23:07:18 +0100 | [diff] [blame] | 1100 | if (ictx) { |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 1101 | /* Handle it like in gsm48_rx_gmm_det_req, |
| 1102 | * except that no messages are sent to the BSS */ |
| 1103 | |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1104 | LOGMMCTXP(LOGL_NOTICE, ctx, "Deleting old MM Context for same IMSI " |
| 1105 | "p_tmsi_old=0x%08x\n", |
| 1106 | ictx->p_tmsi); |
Jacob Erlbeck | 99985b5 | 2014-10-13 10:32:00 +0200 | [diff] [blame] | 1107 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1108 | mm_ctx_cleanup_free(ictx, "GMM IMSI re-use"); |
Harald Welte | c728eea | 2010-12-24 23:07:18 +0100 | [diff] [blame] | 1109 | } |
| 1110 | } |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1111 | OSMO_STRLCPY_ARRAY(ctx->imsi, mi.imsi); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1112 | break; |
| 1113 | case GSM_MI_TYPE_IMEI: |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1114 | OSMO_STRLCPY_ARRAY(ctx->imei, mi.imei); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1115 | break; |
| 1116 | case GSM_MI_TYPE_IMEISV: |
| 1117 | break; |
| 1118 | } |
| 1119 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1120 | /* Check if we can let the mobile station enter */ |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1121 | mi_typel = mi.type; |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 1122 | return osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_IDEN_RESP_RECV, (void *)mi_typel); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1123 | } |
| 1124 | |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1125 | /* Allocate a new P-TMSI and change context state */ |
| 1126 | static inline void ptmsi_update(struct sgsn_mm_ctx *ctx) |
| 1127 | { |
| 1128 | uint32_t ptmsi; |
| 1129 | /* Don't change the P-TMSI if a P-TMSI re-assignment is under way */ |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1130 | if (ctx->gmm_fsm->state != ST_GMM_COMMON_PROC_INIT) { |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1131 | ptmsi = sgsn_alloc_ptmsi(); |
Max | 7ad8fa6 | 2017-10-09 16:26:43 +0200 | [diff] [blame] | 1132 | if (ptmsi != GSM_RESERVED_TMSI) { |
| 1133 | ctx->p_tmsi_old = ctx->p_tmsi; |
| 1134 | ctx->p_tmsi = ptmsi; |
| 1135 | } else |
| 1136 | LOGMMCTXP(LOGL_ERROR, ctx, "P-TMSI allocation failure: using old one.\n"); |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1137 | } |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1138 | osmo_fsm_inst_dispatch(ctx->gmm_fsm, E_GMM_COMMON_PROC_INIT_REQ, NULL); |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1139 | } |
| 1140 | |
Daniel Willmann | d999e54 | 2020-01-30 12:30:40 +0100 | [diff] [blame] | 1141 | /* Detect if RAT has changed */ |
| 1142 | static bool mmctx_did_rat_change(struct sgsn_mm_ctx *mmctx, struct msgb *msg) |
| 1143 | { |
| 1144 | if (MSG_IU_UE_CTX(msg) && mmctx->ran_type != MM_CTX_T_UTRAN_Iu) |
| 1145 | return true; |
| 1146 | if (!MSG_IU_UE_CTX(msg) && mmctx->ran_type != MM_CTX_T_GERAN_Gb) |
| 1147 | return true; |
| 1148 | return false; |
| 1149 | } |
| 1150 | |
Alexander Couzens | 91a8bbd | 2019-09-11 03:38:14 +0200 | [diff] [blame] | 1151 | /* Notify the FSM of a RAT change */ |
| 1152 | static void mmctx_handle_rat_change(struct sgsn_mm_ctx *mmctx, struct msgb *msg, struct gprs_llc_llme *llme) |
| 1153 | { |
| 1154 | struct gmm_rat_change_data rat_chg = { |
| 1155 | .llme = llme |
| 1156 | }; |
| 1157 | |
| 1158 | rat_chg.new_ran_type = MSG_IU_UE_CTX(msg) ? MM_CTX_T_UTRAN_Iu : MM_CTX_T_GERAN_Gb; |
| 1159 | |
| 1160 | if (rat_chg.new_ran_type != mmctx->ran_type) |
| 1161 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_RAT_CHANGE, (void *) &rat_chg); |
| 1162 | else |
| 1163 | LOGMMCTXP(LOGL_ERROR, mmctx, "RAT didn't change or not implemented (ran_type=%u, " |
| 1164 | "msg_iu_ue_ctx=%p\n", mmctx->ran_type, MSG_IU_UE_CTX(msg)); |
| 1165 | |
| 1166 | } |
| 1167 | |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 1168 | static uint8_t gprs_ms_net_cap_gea_mask(const uint8_t *ms_net_cap, uint8_t cap_len) |
| 1169 | { |
| 1170 | uint8_t mask = (1 << GPRS_ALGO_GEA0); |
| 1171 | mask |= (0x80 & ms_net_cap[0]) ? (1 << GPRS_ALGO_GEA1) : 0; |
| 1172 | |
| 1173 | if (cap_len < 2) |
| 1174 | return mask; |
| 1175 | |
| 1176 | /* extended GEA bits start from 2nd bit of the next byte */ |
| 1177 | mask |= (0x40 & ms_net_cap[1]) ? (1 << GPRS_ALGO_GEA2) : 0; |
| 1178 | mask |= (0x20 & ms_net_cap[1]) ? (1 << GPRS_ALGO_GEA3) : 0; |
| 1179 | mask |= (0x10 & ms_net_cap[1]) ? (1 << GPRS_ALGO_GEA4) : 0; |
| 1180 | return mask; |
| 1181 | } |
| 1182 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 1183 | /* 3GPP TS 24.008 § 9.4.1 Attach request */ |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1184 | static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg, |
| 1185 | struct gprs_llc_llme *llme) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1186 | { |
Harald Welte | 943c5bc | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 1187 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1188 | uint8_t *cur = gh->data, *msnc, *mi_data, *ms_ra_acc_cap; |
| 1189 | uint8_t msnc_len, att_type, mi_len, ms_ra_acc_cap_len; |
Harald Welte | eaa614c | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 1190 | uint16_t drx_par; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1191 | char mi_log_string[32]; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1192 | struct gprs_ra_id ra_id; |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1193 | uint16_t cid = 0; |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1194 | enum gsm48_gmm_cause reject_cause; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1195 | struct osmo_mobile_identity mi; |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1196 | int rc; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1197 | |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 1198 | LOGMMCTXP(LOGL_INFO, ctx, "-> GMM ATTACH REQUEST "); |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1199 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ATTACH_REQUEST)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1200 | |
| 1201 | /* As per TS 04.08 Chapter 4.7.1.4, the attach request arrives either |
| 1202 | * with a foreign TLLI (P-TMSI that was allocated to the MS before), |
| 1203 | * or with random TLLI. */ |
| 1204 | |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1205 | if (!MSG_IU_UE_CTX(msg)) { |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1206 | /* Gb mode */ |
| 1207 | cid = bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); |
Neels Hofmeyr | a7a3947 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 1208 | } else { |
| 1209 | #ifdef BUILD_IU |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1210 | ra_id = MSG_IU_UE_CTX(msg)->ra_id; |
Neels Hofmeyr | a7a3947 | 2017-07-05 15:19:52 +0200 | [diff] [blame] | 1211 | #else |
| 1212 | LOGMMCTXP(LOGL_ERROR, ctx, "Cannot handle Iu Attach Request, built without Iu support\n"); |
| 1213 | return -ENOTSUP; |
| 1214 | #endif |
| 1215 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1216 | |
| 1217 | /* MS network capability 10.5.5.12 */ |
| 1218 | msnc_len = *cur++; |
| 1219 | msnc = cur; |
Alexander Chemeris | 84402c0 | 2013-07-03 10:12:23 +0400 | [diff] [blame] | 1220 | if (msnc_len > sizeof(ctx->ms_network_capa.buf)) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1221 | goto err_inval; |
| 1222 | cur += msnc_len; |
| 1223 | |
Alexander Couzens | c44af53 | 2019-08-12 18:29:57 +0200 | [diff] [blame] | 1224 | /* TODO: In iu mode - handle follow-on request. |
| 1225 | * The follow-on request can be signaled in an Attach Request on IuPS. |
| 1226 | * This means the MS/UE asks to keep the PS connection open for further requests |
| 1227 | * after the Attach Request succeed. |
| 1228 | * The SGSN can decide if it close the connection or not. Both are spec conform. */ |
Daniel Willmann | 746c789 | 2016-01-25 16:49:53 +0100 | [diff] [blame] | 1229 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1230 | /* aTTACH Type 10.5.5.2 */ |
Daniel Willmann | 746c789 | 2016-01-25 16:49:53 +0100 | [diff] [blame] | 1231 | att_type = *cur++ & 0x07; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1232 | |
| 1233 | /* DRX parameter 10.5.5.6 */ |
Harald Welte | 56a0145 | 2010-05-31 22:12:30 +0200 | [diff] [blame] | 1234 | drx_par = *cur++ << 8; |
| 1235 | drx_par |= *cur++; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1236 | |
| 1237 | /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ |
| 1238 | mi_len = *cur++; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1239 | mi_data = cur; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1240 | cur += mi_len; |
| 1241 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1242 | rc = osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
| 1243 | if (rc) |
| 1244 | goto err_inval; |
| 1245 | osmo_mobile_identity_to_str_buf(mi_log_string, sizeof(mi_log_string), &mi); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1246 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1247 | DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_log_string, |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1248 | get_value_string(gprs_att_t_strs, att_type)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1249 | |
Holger Hans Peter Freyther | 1768a57 | 2014-04-04 12:40:34 +0200 | [diff] [blame] | 1250 | /* Old routing area identification 10.5.5.15. Skip it */ |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1251 | cur += 6; |
| 1252 | |
| 1253 | /* MS Radio Access Capability 10.5.5.12a */ |
Harald Welte | 56a0145 | 2010-05-31 22:12:30 +0200 | [diff] [blame] | 1254 | ms_ra_acc_cap_len = *cur++; |
| 1255 | ms_ra_acc_cap = cur; |
Alexander Chemeris | 84402c0 | 2013-07-03 10:12:23 +0400 | [diff] [blame] | 1256 | if (ms_ra_acc_cap_len > sizeof(ctx->ms_radio_access_capa.buf)) |
Harald Welte | c48ac47 | 2010-07-03 21:20:06 +0200 | [diff] [blame] | 1257 | goto err_inval; |
Harald Welte | 4b2ed35 | 2011-07-27 23:35:38 +0200 | [diff] [blame] | 1258 | cur += ms_ra_acc_cap_len; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1259 | |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1260 | LOGPC(DMM, LOGL_INFO, "\n"); |
| 1261 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1262 | /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status */ |
| 1263 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1264 | switch (mi.type) { |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1265 | case GSM_MI_TYPE_IMSI: |
| 1266 | /* Try to find MM context based on IMSI */ |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1267 | if (!ctx) |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1268 | ctx = sgsn_mm_ctx_by_imsi(mi.imsi); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1269 | if (!ctx) { |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1270 | if (MSG_IU_UE_CTX(msg)) |
| 1271 | ctx = sgsn_mm_ctx_alloc_iu(MSG_IU_UE_CTX(msg)); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1272 | else |
Alexander Couzens | 2b5fb8e | 2017-02-04 06:01:00 +0100 | [diff] [blame] | 1273 | ctx = sgsn_mm_ctx_alloc_gb(0, &ra_id); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1274 | if (!ctx) { |
| 1275 | reject_cause = GMM_CAUSE_NET_FAIL; |
| 1276 | goto rejected; |
| 1277 | } |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1278 | OSMO_STRLCPY_ARRAY(ctx->imsi, mi.imsi); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1279 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1280 | break; |
| 1281 | case GSM_MI_TYPE_TMSI: |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1282 | /* Try to find MM context based on P-TMSI */ |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1283 | if (!ctx) |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1284 | ctx = sgsn_mm_ctx_by_ptmsi(mi.tmsi); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1285 | if (!ctx) { |
Harald Welte | c728eea | 2010-12-24 23:07:18 +0100 | [diff] [blame] | 1286 | /* Allocate a context as most of our code expects one. |
| 1287 | * Context will not have an IMSI ultil ID RESP is received */ |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1288 | if (MSG_IU_UE_CTX(msg)) |
| 1289 | ctx = sgsn_mm_ctx_alloc_iu(MSG_IU_UE_CTX(msg)); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1290 | else |
Alexander Couzens | 2b5fb8e | 2017-02-04 06:01:00 +0100 | [diff] [blame] | 1291 | ctx = sgsn_mm_ctx_alloc_gb(msgb_tlli(msg), &ra_id); |
Neels Hofmeyr | aa7af4d | 2017-12-20 00:41:27 +0100 | [diff] [blame] | 1292 | if (!ctx) { |
| 1293 | reject_cause = GMM_CAUSE_NET_FAIL; |
| 1294 | goto rejected; |
| 1295 | } |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1296 | ctx->p_tmsi = mi.tmsi; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1297 | } |
| 1298 | break; |
| 1299 | default: |
Harald Welte | eb98c74 | 2015-08-16 17:11:32 +0200 | [diff] [blame] | 1300 | LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting ATTACH REQUEST with " |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1301 | "MI %s\n", mi_log_string); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1302 | reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; |
| 1303 | goto rejected; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1304 | } |
Alexander Couzens | 4ec2176 | 2019-08-13 11:31:42 +0200 | [diff] [blame] | 1305 | |
Alexander Couzens | 91a8bbd | 2019-09-11 03:38:14 +0200 | [diff] [blame] | 1306 | if (mmctx_did_rat_change(ctx, msg)) |
| 1307 | mmctx_handle_rat_change(ctx, msg, llme); |
| 1308 | |
Alexander Couzens | 4ec2176 | 2019-08-13 11:31:42 +0200 | [diff] [blame] | 1309 | if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { |
| 1310 | ctx->gb.tlli = msgb_tlli(msg); |
| 1311 | ctx->gb.llme = llme; |
| 1312 | } |
| 1313 | msgid2mmctx(ctx, msg); |
Harald Welte | 9f1f3ad | 2010-05-02 12:56:57 +0200 | [diff] [blame] | 1314 | /* Update MM Context with currient RA and Cell ID */ |
| 1315 | ctx->ra = ra_id; |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1316 | if (ctx->ran_type == MM_CTX_T_GERAN_Gb) |
| 1317 | ctx->gb.cell_id = cid; |
Daniel Willmann | 770f3e3 | 2016-05-21 00:31:12 +0200 | [diff] [blame] | 1318 | |
Harald Welte | 56a0145 | 2010-05-31 22:12:30 +0200 | [diff] [blame] | 1319 | /* Update MM Context with other data */ |
| 1320 | ctx->drx_parms = drx_par; |
Alexander Chemeris | 84402c0 | 2013-07-03 10:12:23 +0400 | [diff] [blame] | 1321 | ctx->ms_radio_access_capa.len = ms_ra_acc_cap_len; |
Harald Welte | 4b2ed35 | 2011-07-27 23:35:38 +0200 | [diff] [blame] | 1322 | memcpy(ctx->ms_radio_access_capa.buf, ms_ra_acc_cap, |
| 1323 | ctx->ms_radio_access_capa.len); |
Harald Welte | 56a0145 | 2010-05-31 22:12:30 +0200 | [diff] [blame] | 1324 | ctx->ms_network_capa.len = msnc_len; |
| 1325 | memcpy(ctx->ms_network_capa.buf, msnc, msnc_len); |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 1326 | |
| 1327 | ctx->ue_cipher_mask = gprs_ms_net_cap_gea_mask(ctx->ms_network_capa.buf, msnc_len); |
| 1328 | |
Neels Hofmeyr | 340a7e9 | 2022-03-07 15:37:24 +0100 | [diff] [blame] | 1329 | if (!(ctx->ue_cipher_mask & sgsn->cfg.gea_encryption_mask)) { |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 1330 | reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; |
| 1331 | LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting ATTACH REQUEST with MI " |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 1332 | "%s because MS do not support required encryption, mask UE:0x%02x NW:0x%02x \n", |
Neels Hofmeyr | 340a7e9 | 2022-03-07 15:37:24 +0100 | [diff] [blame] | 1333 | mi_log_string, ctx->ue_cipher_mask, sgsn->cfg.gea_encryption_mask); |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 1334 | goto rejected; |
| 1335 | } |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 1336 | |
| 1337 | /* just assume that everythig is fine if the phone offers a5/4: |
| 1338 | * it requires a valid umts security context which we can only have after |
| 1339 | * 1) IDENTITY REQUEST to know what to ask the HLR for |
| 1340 | * 2) and AUTHENTICATION AND CIPHERING REQUEST |
| 1341 | * ... but 2) already requires selecting a cipher mode. |
| 1342 | * So let's just assume we will have the auth data required to make it work. |
| 1343 | */ |
| 1344 | |
Neels Hofmeyr | 340a7e9 | 2022-03-07 15:37:24 +0100 | [diff] [blame] | 1345 | ctx->ciph_algo = gprs_ms_net_select_best_gea(ctx->ue_cipher_mask, sgsn->cfg.gea_encryption_mask); |
Eric | 2f89826 | 2021-05-19 18:57:50 +0200 | [diff] [blame] | 1346 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1347 | #ifdef PTMSI_ALLOC |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1348 | /* Allocate a new P-TMSI (+ P-TMSI signature) and update TLLI */ |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1349 | ptmsi_update(ctx); |
Harald Welte | ab1d562 | 2010-05-18 19:58:38 +0200 | [diff] [blame] | 1350 | #endif |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1351 | |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1352 | if (ctx->ran_type == MM_CTX_T_GERAN_Gb) { |
| 1353 | /* Even if there is no P-TMSI allocated, the MS will |
| 1354 | * switch from foreign TLLI to local TLLI */ |
| 1355 | ctx->gb.tlli_new = gprs_tmsi2tlli(ctx->p_tmsi, TLLI_LOCAL); |
| 1356 | |
| 1357 | /* Inform LLC layer about new TLLI but keep old active */ |
Neels Hofmeyr | aa4ed67 | 2018-04-22 19:29:41 +0200 | [diff] [blame] | 1358 | if (sgsn_mm_ctx_is_authenticated(ctx)) |
Max | 5aa5196 | 2016-07-06 11:33:04 +0200 | [diff] [blame] | 1359 | gprs_llme_copy_key(ctx, ctx->gb.llme); |
| 1360 | |
| 1361 | gprs_llgmm_assign(ctx->gb.llme, ctx->gb.tlli, ctx->gb.tlli_new); |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1362 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1363 | |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 1364 | osmo_fsm_inst_dispatch(ctx->gmm_att_req.fsm, E_ATTACH_REQ_RECV, msg); |
| 1365 | return 0; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1366 | |
| 1367 | err_inval: |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1368 | LOGPC(DMM, LOGL_INFO, "\n"); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1369 | reject_cause = GMM_CAUSE_SEM_INCORR_MSG; |
| 1370 | |
| 1371 | rejected: |
| 1372 | /* Send ATTACH REJECT */ |
| 1373 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 1374 | "Rejecting Attach Request with cause '%s' (%d)\n", |
Jacob Erlbeck | afcf230 | 2015-01-05 17:30:02 +0100 | [diff] [blame] | 1375 | get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1376 | rc = gsm48_tx_gmm_att_rej_oldmsg(msg, reject_cause); |
| 1377 | if (ctx) |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1378 | mm_ctx_cleanup_free(ctx, "GMM ATTACH REJ"); |
Neels Hofmeyr | ceccd46 | 2017-12-20 16:21:45 +0100 | [diff] [blame] | 1379 | else if (llme) |
Max | 3955025 | 2016-06-28 17:39:20 +0200 | [diff] [blame] | 1380 | gprs_llgmm_unassign(llme); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1381 | |
| 1382 | return rc; |
| 1383 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1384 | } |
| 1385 | |
Pau Espin Pedrol | a0bcfad | 2019-09-02 13:27:35 +0200 | [diff] [blame] | 1386 | /* 3GPP TS 24.008 § 9.4.3 Attach complete */ |
| 1387 | static int gsm48_rx_gmm_att_compl(struct sgsn_mm_ctx *mmctx) |
| 1388 | { |
| 1389 | struct sgsn_signal_data sig_data; |
| 1390 | /* only in case SGSN offered new P-TMSI */ |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1391 | LOGMMCTXP(LOGL_INFO, mmctx, "-> GMM ATTACH COMPLETE\n"); |
Pau Espin Pedrol | a0bcfad | 2019-09-02 13:27:35 +0200 | [diff] [blame] | 1392 | |
| 1393 | #ifdef BUILD_IU |
| 1394 | if (mmctx->iu.ue_ctx) { |
| 1395 | ranap_iu_tx_release(mmctx->iu.ue_ctx, NULL); |
| 1396 | } |
| 1397 | #endif |
| 1398 | |
| 1399 | mmctx_timer_stop(mmctx, 3350); |
| 1400 | mmctx->t3350_mode = GMM_T3350_MODE_NONE; |
| 1401 | mmctx->p_tmsi_old = 0; |
| 1402 | mmctx->pending_req = 0; |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1403 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_ATTACH_SUCCESS, NULL); |
Pau Espin Pedrol | a0bcfad | 2019-09-02 13:27:35 +0200 | [diff] [blame] | 1404 | switch(mmctx->ran_type) { |
| 1405 | case MM_CTX_T_UTRAN_Iu: |
| 1406 | osmo_fsm_inst_dispatch(mmctx->iu.mm_state_fsm, E_PMM_PS_ATTACH, NULL); |
| 1407 | break; |
| 1408 | case MM_CTX_T_GERAN_Gb: |
| 1409 | /* Unassign the old TLLI */ |
| 1410 | mmctx->gb.tlli = mmctx->gb.tlli_new; |
| 1411 | gprs_llme_copy_key(mmctx, mmctx->gb.llme); |
| 1412 | gprs_llgmm_assign(mmctx->gb.llme, TLLI_UNASSIGNED, |
| 1413 | mmctx->gb.tlli_new); |
| 1414 | osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_GPRS_ATTACH, NULL); |
| 1415 | break; |
| 1416 | } |
| 1417 | |
| 1418 | osmo_fsm_inst_dispatch(mmctx->gmm_att_req.fsm, E_ATTACH_COMPLETE_RECV, 0); |
| 1419 | memset(&sig_data, 0, sizeof(sig_data)); |
| 1420 | sig_data.mm = mmctx; |
| 1421 | osmo_signal_dispatch(SS_SGSN, S_SGSN_ATTACH, &sig_data); |
| 1422 | |
| 1423 | return 0; |
| 1424 | } |
Alexander Couzens | f7198d7 | 2018-05-22 18:29:14 +0200 | [diff] [blame] | 1425 | |
| 1426 | /* Checks if two attach request contain the IEs and IE values |
| 1427 | * return 0 if equal |
| 1428 | * return -1 if error |
| 1429 | * return 1 if unequal |
| 1430 | * |
| 1431 | * Only do a simple memcmp for now. |
| 1432 | */ |
| 1433 | int gprs_gmm_attach_req_ies(struct msgb *a, struct msgb *b) |
| 1434 | { |
| 1435 | struct gsm48_hdr *gh_a = (struct gsm48_hdr *) msgb_gmmh(a); |
| 1436 | struct gsm48_hdr *gh_b = (struct gsm48_hdr *) msgb_gmmh(b); |
| 1437 | |
| 1438 | #define GMM_ATTACH_REQ_LEN 26 |
| 1439 | |
| 1440 | /* there is the LLC FCS behind */ |
| 1441 | if (msgb_l3len(a) < GMM_ATTACH_REQ_LEN || msgb_l3len(b) < GMM_ATTACH_REQ_LEN) |
| 1442 | return -1; |
| 1443 | |
| 1444 | return !!memcmp(gh_a, gh_b, GMM_ATTACH_REQ_LEN); |
| 1445 | } |
| 1446 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 1447 | /* 3GPP TS 24.008 § 4.7.4.1 / 9.4.5.2 MO Detach request */ |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 1448 | static int gsm48_rx_gmm_det_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1449 | { |
| 1450 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1451 | uint8_t detach_type, power_off; |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 1452 | int rc = 0; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1453 | |
| 1454 | detach_type = gh->data[0] & 0x7; |
| 1455 | power_off = gh->data[0] & 0x8; |
| 1456 | |
| 1457 | /* FIXME: In 24.008 there is an optional P-TMSI and P-TMSI signature IE */ |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1458 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_DETACH_REQUEST)); |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1459 | LOGMMCTXP(LOGL_INFO, ctx, "-> GMM DETACH REQUEST TLLI=0x%08x type=%s %s\n", |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1460 | msgb_tlli(msg), get_value_string(gprs_det_t_mo_strs, detach_type), |
| 1461 | power_off ? "Power-off" : ""); |
| 1462 | |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 1463 | /* Only send the Detach Accept (MO) if power off isn't indicated, |
Jacob Erlbeck | b9ab0d4 | 2014-10-21 09:52:05 +0200 | [diff] [blame] | 1464 | * see 04.08, 4.7.4.1.2/3 for details */ |
| 1465 | if (!power_off) { |
| 1466 | /* force_stby = 0 */ |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 1467 | if (ctx) |
| 1468 | rc = gsm48_tx_gmm_det_ack(ctx, 0); |
| 1469 | else |
| 1470 | rc = gsm48_tx_gmm_det_ack_oldmsg(msg, 0); |
Jacob Erlbeck | b9ab0d4 | 2014-10-21 09:52:05 +0200 | [diff] [blame] | 1471 | } |
Harald Welte | bd5c912 | 2010-06-28 22:18:53 +0200 | [diff] [blame] | 1472 | |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 1473 | if (ctx) { |
| 1474 | struct sgsn_signal_data sig_data; |
| 1475 | memset(&sig_data, 0, sizeof(sig_data)); |
| 1476 | sig_data.mm = ctx; |
| 1477 | osmo_signal_dispatch(SS_SGSN, S_SGSN_DETACH, &sig_data); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1478 | mm_ctx_cleanup_free(ctx, "GMM DETACH REQUEST"); |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 1479 | } |
Jacob Erlbeck | 258ce3d | 2014-09-30 13:51:45 +0200 | [diff] [blame] | 1480 | |
Harald Welte | bd5c912 | 2010-06-28 22:18:53 +0200 | [diff] [blame] | 1481 | return rc; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1482 | } |
| 1483 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1484 | /* Chapter 9.4.15: Routing area update accept */ |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 1485 | static int gsm48_tx_gmm_ra_upd_ack(struct sgsn_mm_ctx *mm) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1486 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 1487 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 UPD ACK"); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1488 | struct gsm48_hdr *gh; |
| 1489 | struct gsm48_ra_upd_ack *rua; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 1490 | unsigned long t; |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 1491 | #ifdef PTMSI_ALLOC |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1492 | uint8_t *l; |
| 1493 | int rc; |
| 1494 | struct osmo_mobile_identity mi; |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 1495 | #endif |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1496 | |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1497 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ROUTING_AREA_ACKED)); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1498 | LOGMMCTXP(LOGL_INFO, mm, "<- GMM ROUTING AREA UPDATE ACCEPT\n"); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1499 | |
Harald Welte | 6463c07 | 2010-05-18 17:04:55 +0200 | [diff] [blame] | 1500 | mmctx2msgid(msg, mm); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1501 | |
| 1502 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); |
| 1503 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 1504 | gh->msg_type = GSM48_MT_GMM_RA_UPD_ACK; |
| 1505 | |
| 1506 | rua = (struct gsm48_ra_upd_ack *) msgb_put(msg, sizeof(*rua)); |
| 1507 | rua->force_stby = 0; /* not indicated */ |
| 1508 | rua->upd_result = 0; /* RA updated */ |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 1509 | t = osmo_tdef_get(sgsn->cfg.T_defs, 3312, OSMO_TDEF_S, -1); |
| 1510 | rua->ra_upd_timer = gprs_secs_to_tmr_floor(t); |
Harald Welte | 11d7c10 | 2010-05-02 11:54:55 +0200 | [diff] [blame] | 1511 | |
Max | 25c65c3 | 2018-01-08 14:43:53 +0100 | [diff] [blame] | 1512 | gsm48_encode_ra(&rua->ra_id, &mm->ra); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1513 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1514 | #if 0 |
| 1515 | /* Optional: P-TMSI signature */ |
| 1516 | msgb_v_put(msg, GSM48_IE_GMM_PTMSI_SIG); |
| 1517 | ptsig = msgb_put(msg, 3); |
| 1518 | ptsig[0] = mm->p_tmsi_sig >> 16; |
| 1519 | ptsig[1] = mm->p_tmsi_sig >> 8; |
| 1520 | ptsig[2] = mm->p_tmsi_sig & 0xff; |
| 1521 | #endif |
| 1522 | |
| 1523 | #ifdef PTMSI_ALLOC |
| 1524 | /* Optional: Allocated P-TMSI */ |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1525 | mi = (struct osmo_mobile_identity){ |
| 1526 | .type = GSM_MI_TYPE_TMSI, |
| 1527 | .tmsi = mm->p_tmsi, |
| 1528 | }; |
| 1529 | l = msgb_tl_put(msg, GSM48_IE_GMM_ALLOC_PTMSI); |
| 1530 | rc = osmo_mobile_identity_encode_msgb(msg, &mi, false); |
| 1531 | if (rc < 0) { |
| 1532 | msgb_free(msg); |
| 1533 | return -EINVAL; |
| 1534 | } |
| 1535 | *l = rc; |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1536 | #endif |
| 1537 | |
Jacob Erlbeck | 8de9c48 | 2015-01-23 11:44:39 +0100 | [diff] [blame] | 1538 | /* Optional: Negotiated READY timer value */ |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 1539 | t = osmo_tdef_get(sgsn->cfg.T_defs, 3314, OSMO_TDEF_S, -1); |
| 1540 | msgb_tv_put(msg, GSM48_IE_GMM_TIMER_READY, gprs_secs_to_tmr_floor(t)); |
Jacob Erlbeck | 8de9c48 | 2015-01-23 11:44:39 +0100 | [diff] [blame] | 1541 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1542 | /* Option: MS ID, ... */ |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 1543 | return gsm48_gmm_sendmsg(msg, 0, mm, true); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1544 | } |
| 1545 | |
| 1546 | /* Chapter 9.4.17: Routing area update reject */ |
Alexander Couzens | d4788cd | 2018-05-02 22:32:19 +0200 | [diff] [blame] | 1547 | int gsm48_tx_gmm_ra_upd_rej(struct msgb *old_msg, uint8_t cause) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1548 | { |
Holger Hans Peter Freyther | 8239e06 | 2016-01-25 22:03:25 +0100 | [diff] [blame] | 1549 | struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 RA UPD REJ"); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1550 | struct gsm48_hdr *gh; |
| 1551 | |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 1552 | LOGP(DMM, LOGL_NOTICE, "<- ROUTING AREA UPDATE REJECT\n"); |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1553 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ROUTING_AREA_REJECT)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1554 | |
Harald Welte | 11d7c10 | 2010-05-02 11:54:55 +0200 | [diff] [blame] | 1555 | gmm_copy_id(msg, old_msg); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1556 | |
| 1557 | gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 2); |
| 1558 | gh->proto_discr = GSM48_PDISC_MM_GPRS; |
| 1559 | gh->msg_type = GSM48_MT_GMM_RA_UPD_REJ; |
| 1560 | gh->data[0] = cause; |
| 1561 | gh->data[1] = 0; /* ? */ |
| 1562 | |
| 1563 | /* Option: P-TMSI signature, allocated P-TMSI, MS ID, ... */ |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 1564 | return gsm48_gmm_sendmsg(msg, 0, NULL, false); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1565 | } |
| 1566 | |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1567 | static void process_ms_ctx_status(struct sgsn_mm_ctx *mmctx, |
Holger Hans Peter Freyther | 2b17454 | 2011-10-14 23:31:34 +0200 | [diff] [blame] | 1568 | const uint8_t *pdp_status) |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1569 | { |
| 1570 | struct sgsn_pdp_ctx *pdp, *pdp2; |
| 1571 | /* 24.008 4.7.5.1.3: If the PDP context status information element is |
| 1572 | * included in ROUTING AREA UPDATE REQUEST message, then the network |
| 1573 | * shall deactivate all those PDP contexts locally (without peer to |
| 1574 | * peer signalling between the MS and the network), which are not in SM |
| 1575 | * state PDP-INACTIVE on network side but are indicated by the MS as |
| 1576 | * being in state PDP-INACTIVE. */ |
| 1577 | |
| 1578 | llist_for_each_entry_safe(pdp, pdp2, &mmctx->pdp_list, list) { |
Pau Espin Pedrol | 25998dd | 2020-10-23 13:11:02 +0200 | [diff] [blame] | 1579 | bool inactive = (pdp->nsapi < 8) ? |
| 1580 | !(pdp_status[0] & (1 << pdp->nsapi)) : |
| 1581 | !(pdp_status[1] & (1 << (pdp->nsapi - 8))); |
| 1582 | if (!inactive) |
| 1583 | continue; |
| 1584 | |
| 1585 | LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping PDP context for NSAPI=%u " |
| 1586 | "due to PDP CTX STATUS IE=0x%02x%02x\n", |
| 1587 | pdp->nsapi, pdp_status[1], pdp_status[0]); |
Pau Espin Pedrol | 08395b3 | 2020-10-23 13:25:10 +0200 | [diff] [blame] | 1588 | if (pdp->ggsn) |
| 1589 | sgsn_delete_pdp_ctx(pdp); |
| 1590 | else /* GTP side already detached, freeing */ |
| 1591 | sgsn_pdp_ctx_free(pdp); |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1592 | } |
| 1593 | } |
| 1594 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 1595 | /* 3GPP TS 24.008 § 4.7.13.4 Service request procedure not accepted by the |
efistokl | def0d94 | 2019-04-23 14:37:13 +0300 | [diff] [blame] | 1596 | * network. Returns true if MS has active PDP contexts in pdp_status */ |
| 1597 | bool pdp_status_has_active_nsapis(const uint8_t *pdp_status, const size_t pdp_status_len) |
| 1598 | { |
| 1599 | size_t i; |
| 1600 | |
| 1601 | for (i = 0; i < pdp_status_len; i++) |
| 1602 | if (pdp_status[i] != 0) |
| 1603 | return true; |
| 1604 | |
| 1605 | return false; |
| 1606 | } |
| 1607 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1608 | /* Chapter 9.4.14: Routing area update request */ |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1609 | static int gsm48_rx_gmm_ra_upd_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg, |
| 1610 | struct gprs_llc_llme *llme) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1611 | { |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 1612 | #ifndef PTMSI_ALLOC |
| 1613 | struct sgsn_signal_data sig_data; |
| 1614 | #endif |
Harald Welte | 943c5bc | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 1615 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Harald Welte | eaa614c | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 1616 | uint8_t *cur = gh->data; |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1617 | uint8_t ms_ra_acc_cap_len; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1618 | struct gprs_ra_id old_ra_id; |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1619 | struct tlv_parsed tp; |
Harald Welte | eaa614c | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 1620 | uint8_t upd_type; |
Philipp Maier | 6934a0f | 2017-01-25 12:19:08 +0100 | [diff] [blame] | 1621 | enum gsm48_gmm_cause reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1622 | int rc; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1623 | |
Alexander Couzens | c44af53 | 2019-08-12 18:29:57 +0200 | [diff] [blame] | 1624 | /* TODO: In iu mode - handle follow-on request. |
| 1625 | * The follow-on request can be signaled in an Attach Request on IuPS. |
| 1626 | * This means the MS/UE asks to keep the PS connection open for further requests |
| 1627 | * after the Attach Request succeed. |
| 1628 | * The SGSN can decide if it close the connection or not. Both are spec conform. */ |
Daniel Willmann | 746c789 | 2016-01-25 16:49:53 +0100 | [diff] [blame] | 1629 | |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1630 | /* Update Type 10.5.5.18 */ |
Daniel Willmann | 746c789 | 2016-01-25 16:49:53 +0100 | [diff] [blame] | 1631 | upd_type = *cur++ & 0x07; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1632 | |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1633 | rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_GPRS_ROUTING_AREA_REQUEST)); |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 1634 | LOGMMCTXP(LOGL_INFO, mmctx, "-> GMM RA UPDATE REQUEST type=\"%s\"\n", |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1635 | get_value_string(gprs_upd_t_strs, upd_type)); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1636 | |
| 1637 | /* Old routing area identification 10.5.5.15 */ |
| 1638 | gsm48_parse_ra(&old_ra_id, cur); |
| 1639 | cur += 6; |
| 1640 | |
| 1641 | /* MS Radio Access Capability 10.5.5.12a */ |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1642 | ms_ra_acc_cap_len = *cur++; |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1643 | if (ms_ra_acc_cap_len > 52) { |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 1644 | LOGMMCTXP(LOGL_ERROR, mmctx, |
Neels Hofmeyr | 7554fd1 | 2018-04-23 17:07:18 +0200 | [diff] [blame] | 1645 | "Rejecting GMM RA Update Request: MS Radio Access Capability too long" |
| 1646 | " (ms_ra_acc_cap_len = %u > 52)\n", ms_ra_acc_cap_len); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1647 | reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; |
| 1648 | goto rejected; |
| 1649 | } |
Harald Welte | 4b2ed35 | 2011-07-27 23:35:38 +0200 | [diff] [blame] | 1650 | cur += ms_ra_acc_cap_len; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1651 | |
| 1652 | /* Optional: Old P-TMSI Signature, Requested READY timer, TMSI Status, |
| 1653 | * DRX parameter, MS network capability */ |
Holger Hans Peter Freyther | 1768a57 | 2014-04-04 12:40:34 +0200 | [diff] [blame] | 1654 | tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1655 | (msg->data + msg->len) - cur, 0, 0); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1656 | |
| 1657 | switch (upd_type) { |
| 1658 | case GPRS_UPD_T_RA_LA: |
| 1659 | case GPRS_UPD_T_RA_LA_IMSI_ATT: |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 1660 | LOGMMCTXP(LOGL_NOTICE, mmctx, "Update type %i unsupported in Mode III, is your SI13 corrupt?\n", upd_type); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1661 | reject_cause = GMM_CAUSE_PROTO_ERR_UNSPEC; |
| 1662 | goto rejected; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1663 | case GPRS_UPD_T_RA: |
| 1664 | case GPRS_UPD_T_PERIODIC: |
| 1665 | break; |
| 1666 | } |
| 1667 | |
Jacob Erlbeck | d35957a | 2016-01-04 18:43:36 +0100 | [diff] [blame] | 1668 | if (!mmctx) { |
| 1669 | /* BSSGP doesn't give us an mmctx */ |
| 1670 | |
| 1671 | /* TODO: Check if there is an MM CTX with old_ra_id and |
| 1672 | * the P-TMSI (if given, reguired for UMTS) or as last resort |
| 1673 | * if the TLLI matches foreign_tlli (P-TMSI). Note that this |
| 1674 | * is an optimization to avoid the RA reject (impl detached) |
| 1675 | * below, which will cause a new attach cycle. */ |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1676 | /* Look-up the MM context based on old RA-ID and TLLI */ |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1677 | if (!MSG_IU_UE_CTX(msg)) { |
| 1678 | /* Gb */ |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1679 | mmctx = sgsn_mm_ctx_by_tlli_and_ptmsi(msgb_tlli(msg), &old_ra_id); |
| 1680 | } else if (TLVP_PRESENT(&tp, GSM48_IE_GMM_ALLOC_PTMSI)) { |
| 1681 | #ifdef BUILD_IU |
| 1682 | /* In Iu mode search only for ptmsi */ |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1683 | struct osmo_mobile_identity mi; |
| 1684 | if (osmo_mobile_identity_decode(&mi, TLVP_VAL(&tp, GSM48_IE_GMM_ALLOC_PTMSI), |
| 1685 | TLVP_LEN(&tp, GSM48_IE_GMM_ALLOC_PTMSI), false) |
| 1686 | || mi.type != GSM_MI_TYPE_TMSI) { |
| 1687 | LOGIUP(MSG_IU_UE_CTX(msg), LOGL_ERROR, "Cannot decode P-TMSI\n"); |
| 1688 | goto rejected; |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1689 | } |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1690 | mmctx = sgsn_mm_ctx_by_ptmsi(mi.tmsi); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1691 | #else |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 1692 | LOGIUP(MSG_IU_UE_CTX(msg), LOGL_ERROR, |
| 1693 | "Rejecting GMM RA Update Request: No Iu support\n"); |
Daniel Willmann | 61329d4 | 2016-05-21 17:36:18 +0200 | [diff] [blame] | 1694 | goto rejected; |
| 1695 | #endif |
| 1696 | } |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1697 | if (mmctx) { |
| 1698 | LOGMMCTXP(LOGL_INFO, mmctx, |
| 1699 | "Looked up by matching TLLI and P_TMSI. " |
| 1700 | "BSSGP TLLI: %08x, P-TMSI: %08x (%08x), " |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 1701 | "TLLI: %08x (%08x), RA: %s\n", |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1702 | msgb_tlli(msg), |
| 1703 | mmctx->p_tmsi, mmctx->p_tmsi_old, |
Harald Welte | f97ee04 | 2015-12-25 19:12:21 +0100 | [diff] [blame] | 1704 | mmctx->gb.tlli, mmctx->gb.tlli_new, |
Neels Hofmeyr | 10719b7 | 2018-02-21 00:39:36 +0100 | [diff] [blame] | 1705 | osmo_rai_name(&mmctx->ra)); |
Alexander Couzens | 91a8bbd | 2019-09-11 03:38:14 +0200 | [diff] [blame] | 1706 | /* A RAT change will trigger the common procedure |
| 1707 | * below after handling the RAT change. Protect it |
| 1708 | * here from being called twice */ |
| 1709 | if (!mmctx_did_rat_change(mmctx, msg)) |
| 1710 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_COMMON_PROC_INIT_REQ, NULL); |
| 1711 | |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1712 | } |
| 1713 | } else if (!gprs_ra_id_equals(&mmctx->ra, &old_ra_id) || |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1714 | mmctx->gmm_fsm->state == ST_GMM_DEREGISTERED) |
Jacob Erlbeck | d35957a | 2016-01-04 18:43:36 +0100 | [diff] [blame] | 1715 | { |
Alexander Couzens | 27a0bf7 | 2020-09-18 15:37:56 +0200 | [diff] [blame] | 1716 | /* We've received either a RAU for a MS which isn't registered |
| 1717 | * or a RAU with an unknown RA ID. As long the SGSN doesn't support |
| 1718 | * PS handover we treat this as invalid RAU */ |
| 1719 | struct gprs_ra_id new_ra_id; |
| 1720 | char new_ra[32]; |
| 1721 | |
| 1722 | bssgp_parse_cell_id(&new_ra_id, msgb_bcid(msg)); |
| 1723 | osmo_rai_name_buf(new_ra, sizeof(new_ra), &new_ra_id); |
| 1724 | |
| 1725 | if (mmctx->gmm_fsm->state == ST_GMM_DEREGISTERED) |
| 1726 | LOGMMCTXP(LOGL_INFO, mmctx, |
| 1727 | "Rejecting RAU - GMM state is deregistered. Old RA: %s New RA: %s\n", |
| 1728 | osmo_rai_name(&old_ra_id), new_ra); |
| 1729 | else |
| 1730 | LOGMMCTXP(LOGL_INFO, mmctx, |
| 1731 | "Rejecting RAU - Old RA doesn't match MM. Old RA: %s New RA: %s\n", |
| 1732 | osmo_rai_name(&old_ra_id), new_ra); |
| 1733 | |
| 1734 | reject_cause = GMM_CAUSE_IMPL_DETACHED; |
| 1735 | goto rejected; |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1736 | } |
Jacob Erlbeck | d35957a | 2016-01-04 18:43:36 +0100 | [diff] [blame] | 1737 | |
Jacob Erlbeck | 5ac4aad | 2016-01-04 18:43:38 +0100 | [diff] [blame] | 1738 | if (!mmctx) { |
Harald Welte | 2b2429e | 2015-12-25 22:31:36 +0100 | [diff] [blame] | 1739 | if (llme) { |
| 1740 | /* send a XID reset to re-set all LLC sequence numbers |
| 1741 | * in the MS */ |
Pau Espin Pedrol | 029a70e | 2019-11-21 13:58:39 +0100 | [diff] [blame] | 1742 | LOGGBP(llme, DMM, LOGL_NOTICE, "LLC XID RESET\n"); |
Pau Espin Pedrol | 9203da5 | 2019-11-21 16:31:00 +0100 | [diff] [blame] | 1743 | gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM, llme); |
Harald Welte | 2b2429e | 2015-12-25 22:31:36 +0100 | [diff] [blame] | 1744 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1745 | /* The MS has to perform GPRS attach */ |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 1746 | /* Device is still IMSI attached for CS but initiate GPRS ATTACH, |
| 1747 | * see GSM 04.08, 4.7.5.1.4 and G.6 */ |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 1748 | LOGGBIUP(llme, msg, LOGL_ERROR, "Rejecting GMM RA Update Request: MS should GMM Attach first\n"); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1749 | reject_cause = GMM_CAUSE_IMPL_DETACHED; |
| 1750 | goto rejected; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1751 | } |
| 1752 | |
Alexander Couzens | 91a8bbd | 2019-09-11 03:38:14 +0200 | [diff] [blame] | 1753 | if (mmctx_did_rat_change(mmctx, msg)) { |
| 1754 | mmctx_handle_rat_change(mmctx, msg, llme); |
| 1755 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_COMMON_PROC_INIT_REQ, NULL); |
| 1756 | } |
| 1757 | |
Harald Welte | f0901f0 | 2010-12-26 10:39:26 +0100 | [diff] [blame] | 1758 | /* Store new BVCI/NSEI in MM context (FIXME: delay until we ack?) */ |
| 1759 | msgid2mmctx(mmctx, msg); |
| 1760 | /* Bump the statistics of received signalling msgs for this MM context */ |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1761 | rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PKTS_SIG_IN)); |
Harald Welte | f0901f0 | 2010-12-26 10:39:26 +0100 | [diff] [blame] | 1762 | |
Harald Welte | 9f1f3ad | 2010-05-02 12:56:57 +0200 | [diff] [blame] | 1763 | /* Update the MM context with the new RA-ID */ |
Neels Hofmeyr | c6548bb | 2019-12-25 23:46:06 +0100 | [diff] [blame] | 1764 | if (mmctx->ran_type == MM_CTX_T_GERAN_Gb && msgb_bcid(msg)) { |
Daniel Willmann | f9f4387 | 2016-05-20 22:36:23 +0200 | [diff] [blame] | 1765 | bssgp_parse_cell_id(&mmctx->ra, msgb_bcid(msg)); |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1766 | /* Update the MM context with the new (i.e. foreign) TLLI */ |
| 1767 | mmctx->gb.tlli = msgb_tlli(msg); |
| 1768 | } |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1769 | /* FIXME: Update the MM context with the MS radio acc capabilities */ |
| 1770 | /* FIXME: Update the MM context with the MS network capabilities */ |
| 1771 | |
Pau Espin Pedrol | a33f006 | 2021-06-04 17:27:03 +0200 | [diff] [blame] | 1772 | rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_RA_UPDATE)); |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 1773 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1774 | #ifdef PTMSI_ALLOC |
Max | 86e04df | 2017-10-09 16:21:31 +0200 | [diff] [blame] | 1775 | ptmsi_update(mmctx); |
| 1776 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1777 | /* Start T3350 and re-transmit up to 5 times until ATTACH COMPLETE */ |
| 1778 | mmctx->t3350_mode = GMM_T3350_MODE_RAU; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 1779 | mmctx_timer_start(mmctx, 3350); |
Jacob Erlbeck | 0074a77 | 2014-10-28 16:23:46 +0100 | [diff] [blame] | 1780 | #else |
| 1781 | /* Make sure we are NORMAL (i.e. not SUSPENDED anymore) */ |
Pau Espin Pedrol | 8c3d7fd | 2020-11-26 18:18:07 +0100 | [diff] [blame] | 1782 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_ATTACH_SUCCESS, NULL); |
Holger Hans Peter Freyther | b100895 | 2015-05-02 19:55:38 +0200 | [diff] [blame] | 1783 | |
| 1784 | memset(&sig_data, 0, sizeof(sig_data)); |
| 1785 | sig_data.mm = mmctx; |
| 1786 | osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1787 | #endif |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1788 | if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { |
| 1789 | /* Even if there is no P-TMSI allocated, the MS will switch from |
| 1790 | * foreign TLLI to local TLLI */ |
| 1791 | mmctx->gb.tlli_new = gprs_tmsi2tlli(mmctx->p_tmsi, TLLI_LOCAL); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 1792 | |
Pau Espin Pedrol | 982e130 | 2019-08-13 20:01:44 +0200 | [diff] [blame] | 1793 | /* Inform LLC layer about new TLLI but keep accepting the old one during Rx */ |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1794 | gprs_llgmm_assign(mmctx->gb.llme, mmctx->gb.tlli, |
Max | 5aa5196 | 2016-07-06 11:33:04 +0200 | [diff] [blame] | 1795 | mmctx->gb.tlli_new); |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 1796 | } |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 1797 | |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1798 | /* Look at PDP Context Status IE and see if MS's view of |
| 1799 | * activated/deactivated NSAPIs agrees with our view */ |
| 1800 | if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) { |
Holger Hans Peter Freyther | 2b17454 | 2011-10-14 23:31:34 +0200 | [diff] [blame] | 1801 | const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); |
Harald Welte | 588d44e | 2010-06-09 10:28:29 +0200 | [diff] [blame] | 1802 | process_ms_ctx_status(mmctx, pdp_status); |
| 1803 | } |
| 1804 | |
Daniel Willmann | af24172 | 2016-05-21 00:35:41 +0200 | [diff] [blame] | 1805 | /* Send RA UPDATE ACCEPT. In Iu, the RA upd request can be called from |
| 1806 | * a new Iu connection, so we might need to re-authenticate the |
| 1807 | * connection as well as turn on integrity protection. */ |
| 1808 | mmctx->pending_req = GSM48_MT_GMM_RA_UPD_REQ; |
| 1809 | return gsm48_gmm_authorize(mmctx); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1810 | |
| 1811 | rejected: |
| 1812 | /* Send RA UPDATE REJECT */ |
| 1813 | LOGMMCTXP(LOGL_NOTICE, mmctx, |
| 1814 | "Rejecting RA Update Request with cause '%s' (%d)\n", |
Jacob Erlbeck | afcf230 | 2015-01-05 17:30:02 +0100 | [diff] [blame] | 1815 | get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1816 | rc = gsm48_tx_gmm_ra_upd_rej(msg, reject_cause); |
| 1817 | if (mmctx) |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 1818 | mm_ctx_cleanup_free(mmctx, "GMM RA UPDATE REJ"); |
Pau Espin Pedrol | d723a97 | 2019-08-12 17:43:35 +0200 | [diff] [blame] | 1819 | else if (llme) |
| 1820 | gprs_llgmm_unassign(llme); |
Alexander Couzens | 10af11d | 2019-09-17 16:52:15 +0200 | [diff] [blame] | 1821 | #ifdef BUILD_IU |
| 1822 | else if (MSG_IU_UE_CTX(msg)) { |
| 1823 | unsigned long X1001 = osmo_tdef_get(sgsn->cfg.T_defs, -1001, OSMO_TDEF_S, -1); |
| 1824 | ranap_iu_tx_release_free(MSG_IU_UE_CTX(msg), NULL, (int) X1001); |
| 1825 | } |
| 1826 | #endif |
Jacob Erlbeck | 80d07e3 | 2014-11-06 13:43:41 +0100 | [diff] [blame] | 1827 | |
| 1828 | return rc; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1829 | } |
| 1830 | |
Pau Espin Pedrol | ab264eb | 2019-09-02 13:36:11 +0200 | [diff] [blame] | 1831 | /* 3GPP TS 24.008 § 9.4.16: Routing area update complete */ |
| 1832 | static int gsm48_rx_gmm_ra_upd_compl(struct sgsn_mm_ctx *mmctx) |
| 1833 | { |
| 1834 | struct sgsn_signal_data sig_data; |
| 1835 | /* only in case SGSN offered new P-TMSI */ |
| 1836 | LOGMMCTXP(LOGL_INFO, mmctx, "-> ROUTING AREA UPDATE COMPLETE\n"); |
| 1837 | mmctx_timer_stop(mmctx, 3350); |
| 1838 | mmctx->t3350_mode = GMM_T3350_MODE_NONE; |
| 1839 | mmctx->p_tmsi_old = 0; |
| 1840 | mmctx->pending_req = 0; |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1841 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_COMMON_PROC_SUCCESS, NULL); |
Pau Espin Pedrol | ab264eb | 2019-09-02 13:36:11 +0200 | [diff] [blame] | 1842 | switch(mmctx->ran_type) { |
| 1843 | case MM_CTX_T_UTRAN_Iu: |
| 1844 | osmo_fsm_inst_dispatch(mmctx->iu.mm_state_fsm, E_PMM_RA_UPDATE, NULL); |
| 1845 | break; |
| 1846 | case MM_CTX_T_GERAN_Gb: |
| 1847 | /* Unassign the old TLLI */ |
| 1848 | mmctx->gb.tlli = mmctx->gb.tlli_new; |
| 1849 | gprs_llgmm_assign(mmctx->gb.llme, TLLI_UNASSIGNED, |
| 1850 | mmctx->gb.tlli_new); |
| 1851 | osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_RA_UPDATE, NULL); |
| 1852 | break; |
| 1853 | } |
| 1854 | |
| 1855 | memset(&sig_data, 0, sizeof(sig_data)); |
| 1856 | sig_data.mm = mmctx; |
| 1857 | osmo_signal_dispatch(SS_SGSN, S_SGSN_UPDATE, &sig_data); |
| 1858 | |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
Pau Espin Pedrol | 33ebedc | 2019-09-02 13:43:51 +0200 | [diff] [blame] | 1862 | /* 3GPP TS 24.008 § 9.4.8: P-TMSI reallocation complete */ |
| 1863 | static int gsm48_rx_gmm_ptmsi_reall_compl(struct sgsn_mm_ctx *mmctx) |
| 1864 | { |
| 1865 | LOGMMCTXP(LOGL_INFO, mmctx, "-> PTMSI REALLOCATION COMPLETE\n"); |
| 1866 | mmctx_timer_stop(mmctx, 3350); |
| 1867 | mmctx->t3350_mode = GMM_T3350_MODE_NONE; |
| 1868 | mmctx->p_tmsi_old = 0; |
| 1869 | mmctx->pending_req = 0; |
| 1870 | if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) { |
| 1871 | /* Unassign the old TLLI */ |
| 1872 | mmctx->gb.tlli = mmctx->gb.tlli_new; |
| 1873 | //gprs_llgmm_assign(mmctx->gb.llme, TLLI_UNASSIGNED, mmctx->gb.tlli_new, GPRS_ALGO_GEA0, NULL); |
| 1874 | } |
| 1875 | return 0; |
| 1876 | } |
| 1877 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 1878 | /* 3GPP TS 24.008 § 9.4.20 Service request. |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1879 | * In Iu, a UE in PMM-IDLE mode can use GSM48_MT_GMM_SERVICE_REQ to switch back |
| 1880 | * to PMM-CONNECTED mode. */ |
| 1881 | static int gsm48_rx_gmm_service_req(struct sgsn_mm_ctx *ctx, struct msgb *msg) |
| 1882 | { |
| 1883 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1884 | uint8_t *cur = gh->data, *mi_data; |
| 1885 | uint8_t service_type, mi_len; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1886 | struct tlv_parsed tp; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1887 | struct osmo_mobile_identity mi; |
| 1888 | char mi_log_string[32]; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1889 | enum gsm48_gmm_cause reject_cause; |
| 1890 | int rc; |
| 1891 | |
| 1892 | LOGMMCTXP(LOGL_INFO, ctx, "-> GMM SERVICE REQUEST "); |
| 1893 | |
| 1894 | /* This message is only valid in Iu mode */ |
Pau Espin Pedrol | dfd7c24 | 2019-08-12 16:06:49 +0200 | [diff] [blame] | 1895 | if (!MSG_IU_UE_CTX(msg)) { |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1896 | LOGPC(DMM, LOGL_INFO, "Invalid if not in Iu mode\n"); |
| 1897 | return -1; |
| 1898 | } |
| 1899 | |
| 1900 | /* Skip Ciphering key sequence number 10.5.1.2 */ |
Pau Espin Pedrol | db6f803 | 2018-01-07 18:13:09 +0100 | [diff] [blame] | 1901 | /* uint8_t ciph_seq_nr = *cur & 0x07; */ |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1902 | |
| 1903 | /* Service type 10.5.5.20 */ |
| 1904 | service_type = (*cur++ >> 4) & 0x07; |
| 1905 | |
| 1906 | /* Mobile Identity (P-TMSI or IMSI) 10.5.1.4 */ |
| 1907 | mi_len = *cur++; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1908 | mi_data = cur; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1909 | cur += mi_len; |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1910 | rc = osmo_mobile_identity_decode(&mi, mi_data, mi_len, false); |
| 1911 | if (rc) |
| 1912 | goto err_inval; |
| 1913 | osmo_mobile_identity_to_str_buf(mi_log_string, sizeof(mi_log_string), &mi); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1914 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1915 | DEBUGPC(DMM, "MI(%s) type=\"%s\" ", mi_log_string, |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1916 | get_value_string(gprs_service_t_strs, service_type)); |
| 1917 | |
| 1918 | LOGPC(DMM, LOGL_INFO, "\n"); |
| 1919 | |
| 1920 | /* Optional: PDP context status, MBMS context status, Uplink data status, Device properties */ |
| 1921 | tlv_parse(&tp, &gsm48_gmm_att_tlvdef, cur, (msg->data + msg->len) - cur, 0, 0); |
| 1922 | |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1923 | switch (mi.type) { |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1924 | case GSM_MI_TYPE_IMSI: |
| 1925 | /* Try to find MM context based on IMSI */ |
| 1926 | if (!ctx) |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1927 | ctx = sgsn_mm_ctx_by_imsi(mi.imsi); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1928 | if (!ctx) { |
| 1929 | /* FIXME: We need to have a context for service request? */ |
Alexander Couzens | 47cf6bd | 2018-07-17 20:13:27 +0200 | [diff] [blame] | 1930 | reject_cause = GMM_CAUSE_IMPL_DETACHED; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1931 | goto rejected; |
| 1932 | } |
| 1933 | msgid2mmctx(ctx, msg); |
| 1934 | break; |
| 1935 | case GSM_MI_TYPE_TMSI: |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1936 | /* Try to find MM context based on P-TMSI */ |
| 1937 | if (!ctx) |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1938 | ctx = sgsn_mm_ctx_by_ptmsi(mi.tmsi); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1939 | if (!ctx) { |
| 1940 | /* FIXME: We need to have a context for service request? */ |
Alexander Couzens | 47cf6bd | 2018-07-17 20:13:27 +0200 | [diff] [blame] | 1941 | reject_cause = GMM_CAUSE_IMPL_DETACHED; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1942 | goto rejected; |
| 1943 | } |
| 1944 | msgid2mmctx(ctx, msg); |
| 1945 | break; |
| 1946 | default: |
| 1947 | LOGMMCTXP(LOGL_NOTICE, ctx, "Rejecting SERVICE REQUEST with " |
Neels Hofmeyr | b26a5a8 | 2020-05-29 16:53:23 +0200 | [diff] [blame] | 1948 | "MI %s\n", mi_log_string); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1949 | reject_cause = GMM_CAUSE_MS_ID_NOT_DERIVED; |
| 1950 | goto rejected; |
| 1951 | } |
| 1952 | |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 1953 | osmo_fsm_inst_dispatch(ctx->gmm_fsm, E_GMM_COMMON_PROC_INIT_REQ, NULL); |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1954 | |
| 1955 | ctx->iu.service.type = service_type; |
| 1956 | |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1957 | /* Look at PDP Context Status IE and see if MS's view of |
| 1958 | * activated/deactivated NSAPIs agrees with our view */ |
| 1959 | if (TLVP_PRESENT(&tp, GSM48_IE_GMM_PDP_CTX_STATUS)) { |
| 1960 | const uint8_t *pdp_status = TLVP_VAL(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); |
efistokl | def0d94 | 2019-04-23 14:37:13 +0300 | [diff] [blame] | 1961 | const size_t pdp_status_len = TLVP_LEN(&tp, GSM48_IE_GMM_PDP_CTX_STATUS); |
| 1962 | |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1963 | process_ms_ctx_status(ctx, pdp_status); |
efistokl | def0d94 | 2019-04-23 14:37:13 +0300 | [diff] [blame] | 1964 | |
Pau Espin Pedrol | 5623eb8 | 2019-08-21 17:18:14 +0200 | [diff] [blame] | 1965 | /* 3GPP TS 24.008 § 4.7.13.4 Service request procedure not |
efistokl | def0d94 | 2019-04-23 14:37:13 +0300 | [diff] [blame] | 1966 | * accepted by the network. Cause #40. If MS has PDP Contexts in |
| 1967 | * Active state in pdp_status but there is no PDP contexts on |
| 1968 | * SGSN side then Reject with the cause will force the mobile to |
| 1969 | * reset PDP contexts */ |
| 1970 | if (llist_empty(&ctx->pdp_list) && pdp_status_has_active_nsapis(pdp_status, pdp_status_len)) { |
| 1971 | reject_cause = GMM_CAUSE_NO_PDP_ACTIVATED; |
| 1972 | goto rejected; |
| 1973 | } |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 1974 | } |
| 1975 | |
| 1976 | |
| 1977 | ctx->pending_req = GSM48_MT_GMM_SERVICE_REQ; |
| 1978 | return gsm48_gmm_authorize(ctx); |
| 1979 | |
| 1980 | err_inval: |
| 1981 | LOGPC(DMM, LOGL_INFO, "\n"); |
| 1982 | reject_cause = GMM_CAUSE_SEM_INCORR_MSG; |
| 1983 | |
| 1984 | rejected: |
| 1985 | /* Send SERVICE REJECT */ |
| 1986 | LOGMMCTXP(LOGL_NOTICE, ctx, |
| 1987 | "Rejecting Service Request with cause '%s' (%d)\n", |
| 1988 | get_value_string(gsm48_gmm_cause_names, reject_cause), reject_cause); |
| 1989 | rc = gsm48_tx_gmm_service_rej_oldmsg(msg, reject_cause); |
| 1990 | |
| 1991 | return rc; |
| 1992 | |
| 1993 | } |
| 1994 | |
| 1995 | |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 1996 | static int gsm48_rx_gmm_status(struct sgsn_mm_ctx *mmctx, struct msgb *msg) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1997 | { |
| 1998 | struct gsm48_hdr *gh = msgb_l3(msg); |
| 1999 | |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 2000 | LOGMMCTXP(LOGL_INFO, mmctx, "-> GMM STATUS (cause: %s)\n", |
Jacob Erlbeck | afcf230 | 2015-01-05 17:30:02 +0100 | [diff] [blame] | 2001 | get_value_string(gsm48_gmm_cause_names, gh->data[0])); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2002 | |
| 2003 | return 0; |
| 2004 | } |
| 2005 | |
Pau Espin Pedrol | 72b61e4 | 2019-08-12 16:43:58 +0200 | [diff] [blame] | 2006 | /* Rx GPRS Mobility Management. MMCTX can be NULL when called. On !Gb (Iu), llme is NULL */ |
Pau Espin Pedrol | 6dfb5fe | 2019-08-29 17:21:00 +0200 | [diff] [blame] | 2007 | int gsm0408_rcv_gmm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 2008 | struct gprs_llc_llme *llme, bool drop_cipherable) |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2009 | { |
Harald Welte | 943c5bc | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 2010 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2011 | int rc; |
| 2012 | |
Max | 8204010 | 2016-07-06 11:59:18 +0200 | [diff] [blame] | 2013 | if (drop_cipherable && gsm48_hdr_gmm_cipherable(gh)) { |
| 2014 | LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping cleartext GMM %s which " |
| 2015 | "is expected to be encrypted for TLLI 0x%08x\n", |
| 2016 | get_value_string(gprs_msgt_gmm_names, gh->msg_type), |
| 2017 | llme->tlli); |
| 2018 | return -EBADMSG; |
| 2019 | } |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 2020 | |
Harald Welte | 2b2429e | 2015-12-25 22:31:36 +0100 | [diff] [blame] | 2021 | if (llme && !mmctx && |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 2022 | gh->msg_type != GSM48_MT_GMM_ATTACH_REQ && |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2023 | gh->msg_type != GSM48_MT_GMM_RA_UPD_REQ) { |
Pau Espin Pedrol | 029a70e | 2019-11-21 13:58:39 +0100 | [diff] [blame] | 2024 | LOGGBP(llme, DMM, LOGL_NOTICE, "Cannot handle GMM for unknown MM CTX\n"); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2025 | /* 4.7.10 */ |
Jacob Erlbeck | 14ae582 | 2014-10-28 09:47:03 +0100 | [diff] [blame] | 2026 | if (gh->msg_type == GSM48_MT_GMM_STATUS) { |
| 2027 | /* TLLI unassignment */ |
Max | 3955025 | 2016-06-28 17:39:20 +0200 | [diff] [blame] | 2028 | gprs_llgmm_unassign(llme); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2029 | return 0; |
Jacob Erlbeck | 14ae582 | 2014-10-28 09:47:03 +0100 | [diff] [blame] | 2030 | } |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2031 | |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2032 | /* Don't reply or establish a LLME on DETACH_ACK */ |
Max | 3955025 | 2016-06-28 17:39:20 +0200 | [diff] [blame] | 2033 | if (gh->msg_type == GSM48_MT_GMM_DETACH_ACK) |
| 2034 | return gprs_llgmm_unassign(llme); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2035 | |
Alexander Couzens | 85ca87b | 2018-05-02 18:17:34 +0200 | [diff] [blame] | 2036 | /* Don't reply to deatch requests, reason power off */ |
| 2037 | if (gh->msg_type == GSM48_MT_GMM_DETACH_REQ && |
| 2038 | gh->data[0] & 0x8) { |
| 2039 | return 0; |
| 2040 | } |
| 2041 | |
| 2042 | |
Jacob Erlbeck | c4f9bf3 | 2014-11-11 08:55:13 +0100 | [diff] [blame] | 2043 | gprs_llgmm_reset(llme); |
| 2044 | |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2045 | /* Don't force it into re-attachment */ |
| 2046 | if (gh->msg_type == GSM48_MT_GMM_DETACH_REQ) { |
Jacob Erlbeck | 5a38f64 | 2014-10-21 13:09:55 +0200 | [diff] [blame] | 2047 | /* Handle Detach Request */ |
| 2048 | rc = gsm48_rx_gmm_det_req(NULL, msg); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2049 | |
| 2050 | /* TLLI unassignment */ |
Max | 3955025 | 2016-06-28 17:39:20 +0200 | [diff] [blame] | 2051 | gprs_llgmm_unassign(llme); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2052 | return rc; |
| 2053 | } |
| 2054 | |
| 2055 | /* Force the MS to re-attach */ |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 2056 | rc = gsm0408_gprs_force_reattach_oldmsg(msg, llme); |
Jacob Erlbeck | b1c074f | 2014-10-31 12:27:11 +0100 | [diff] [blame] | 2057 | |
| 2058 | /* TLLI unassignment */ |
Max | 3955025 | 2016-06-28 17:39:20 +0200 | [diff] [blame] | 2059 | gprs_llgmm_unassign(llme); |
Jacob Erlbeck | b1c074f | 2014-10-31 12:27:11 +0100 | [diff] [blame] | 2060 | return rc; |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 2061 | } |
| 2062 | |
Daniel Willmann | d999e54 | 2020-01-30 12:30:40 +0100 | [diff] [blame] | 2063 | /* A RAT change is only expected/allowed for RAU/Attach Req */ |
| 2064 | if (mmctx && mmctx_did_rat_change(mmctx, msg)) { |
| 2065 | switch (gh->msg_type) { |
| 2066 | case GSM48_MT_GMM_RA_UPD_REQ: |
| 2067 | case GSM48_MT_GMM_ATTACH_REQ: |
| 2068 | break; |
| 2069 | default: |
| 2070 | /* This shouldn't happen with other message types and |
| 2071 | * we need to error out to prevent a crash */ |
| 2072 | LOGMMCTXP(LOGL_NOTICE, mmctx, "Dropping GMM %s which was received on different " |
| 2073 | "RAT (mmctx ran_type=%u, msg_iu_ue_ctx=%p\n", |
| 2074 | get_value_string(gprs_msgt_gmm_names, gh->msg_type), |
| 2075 | mmctx->ran_type, MSG_IU_UE_CTX(msg)); |
| 2076 | return -EINVAL; |
| 2077 | } |
| 2078 | } |
| 2079 | |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2080 | /* |
| 2081 | * For a few messages, mmctx may be NULL. For most, we want to ensure a |
| 2082 | * non-NULL mmctx. At the same time, we want to keep the message |
| 2083 | * validity check intact, so that all message types appear in the |
| 2084 | * switch statement and the default case thus means "unknown message". |
| 2085 | * If we split the switch in two parts to check non-NULL halfway, the |
| 2086 | * unknown-message check breaks, or we'd need to duplicate the switch |
| 2087 | * cases in both parts. Just keep one large switch and add some gotos. |
| 2088 | */ |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2089 | switch (gh->msg_type) { |
| 2090 | case GSM48_MT_GMM_RA_UPD_REQ: |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 2091 | rc = gsm48_rx_gmm_ra_upd_req(mmctx, msg, llme); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2092 | break; |
| 2093 | case GSM48_MT_GMM_ATTACH_REQ: |
Harald Welte | 807a5d8 | 2010-06-01 11:53:01 +0200 | [diff] [blame] | 2094 | rc = gsm48_rx_gmm_att_req(mmctx, msg, llme); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2095 | break; |
Daniel Willmann | 1dee2b6 | 2016-05-21 00:15:29 +0200 | [diff] [blame] | 2096 | case GSM48_MT_GMM_SERVICE_REQ: |
| 2097 | rc = gsm48_rx_gmm_service_req(mmctx, msg); |
| 2098 | break; |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2099 | /* For all the following types mmctx can not be NULL */ |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2100 | case GSM48_MT_GMM_ID_RESP: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2101 | if (!mmctx) |
| 2102 | goto null_mmctx; |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 2103 | rc = gsm48_rx_gmm_id_resp(mmctx, msg); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2104 | break; |
| 2105 | case GSM48_MT_GMM_STATUS: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2106 | if (!mmctx) |
| 2107 | goto null_mmctx; |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 2108 | rc = gsm48_rx_gmm_status(mmctx, msg); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2109 | break; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 2110 | case GSM48_MT_GMM_DETACH_REQ: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2111 | if (!mmctx) |
| 2112 | goto null_mmctx; |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 2113 | rc = gsm48_rx_gmm_det_req(mmctx, msg); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 2114 | break; |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2115 | case GSM48_MT_GMM_DETACH_ACK: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2116 | if (!mmctx) |
| 2117 | goto null_mmctx; |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2118 | LOGMMCTXP(LOGL_INFO, mmctx, "-> DETACH ACK\n"); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 2119 | mm_ctx_cleanup_free(mmctx, "GMM DETACH ACK"); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2120 | rc = 0; |
| 2121 | break; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2122 | case GSM48_MT_GMM_ATTACH_COMPL: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2123 | if (!mmctx) |
| 2124 | goto null_mmctx; |
Pau Espin Pedrol | a0bcfad | 2019-09-02 13:27:35 +0200 | [diff] [blame] | 2125 | rc = gsm48_rx_gmm_att_compl(mmctx); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2126 | break; |
Harald Welte | ab1d562 | 2010-05-18 19:58:38 +0200 | [diff] [blame] | 2127 | case GSM48_MT_GMM_RA_UPD_COMPL: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2128 | if (!mmctx) |
| 2129 | goto null_mmctx; |
Pau Espin Pedrol | ab264eb | 2019-09-02 13:36:11 +0200 | [diff] [blame] | 2130 | rc = gsm48_rx_gmm_ra_upd_compl(mmctx); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2131 | break; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2132 | case GSM48_MT_GMM_PTMSI_REALL_COMPL: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2133 | if (!mmctx) |
| 2134 | goto null_mmctx; |
Pau Espin Pedrol | 33ebedc | 2019-09-02 13:43:51 +0200 | [diff] [blame] | 2135 | rc = gsm48_rx_gmm_ptmsi_reall_compl(mmctx); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2136 | break; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2137 | case GSM48_MT_GMM_AUTH_CIPH_RESP: |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2138 | if (!mmctx) |
| 2139 | goto null_mmctx; |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 2140 | rc = gsm48_rx_gmm_auth_ciph_resp(mmctx, msg); |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2141 | break; |
Neels Hofmeyr | 058cd57 | 2017-02-24 06:24:45 +0100 | [diff] [blame] | 2142 | case GSM48_MT_GMM_AUTH_CIPH_FAIL: |
| 2143 | rc = gsm48_rx_gmm_auth_ciph_fail(mmctx, msg); |
| 2144 | break; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2145 | default: |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2146 | LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GMM msg type 0x%02x\n", |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2147 | gh->msg_type); |
Neels Hofmeyr | 9329e6f | 2016-06-03 00:44:23 +0200 | [diff] [blame] | 2148 | if (mmctx) |
| 2149 | rc = gsm48_tx_gmm_status(mmctx, GMM_CAUSE_MSGT_NOTEXIST_NOTIMPL); |
| 2150 | else |
| 2151 | rc = -EINVAL; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2152 | break; |
| 2153 | } |
| 2154 | |
| 2155 | return rc; |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2156 | |
| 2157 | null_mmctx: |
Pau Espin Pedrol | 5b6c4b8 | 2019-08-14 16:08:15 +0200 | [diff] [blame] | 2158 | LOGGBIUP(llme, msg, LOGL_ERROR, |
Pau Espin Pedrol | c8ace5a | 2021-03-25 16:03:02 +0100 | [diff] [blame] | 2159 | "Received GSM 04.08 message type %s," |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2160 | " but no MM context available\n", |
Pau Espin Pedrol | c8ace5a | 2021-03-25 16:03:02 +0100 | [diff] [blame] | 2161 | get_value_string(gprs_msgt_gmm_names, gh->msg_type)); |
Neels Hofmeyr | e98ba82 | 2016-05-22 14:28:19 +0200 | [diff] [blame] | 2162 | return -EINVAL; |
Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2163 | } |
| 2164 | |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2165 | static void mmctx_timer_cb(void *_mm) |
| 2166 | { |
| 2167 | struct sgsn_mm_ctx *mm = _mm; |
Jacob Erlbeck | bd0cf11 | 2014-12-01 12:33:33 +0100 | [diff] [blame] | 2168 | struct gsm_auth_tuple *at; |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 2169 | int rc; |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 2170 | unsigned long seconds; |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2171 | |
| 2172 | mm->num_T_exp++; |
| 2173 | |
| 2174 | switch (mm->T) { |
| 2175 | case 3350: /* waiting for ATTACH COMPLETE */ |
| 2176 | if (mm->num_T_exp >= 5) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2177 | LOGMMCTXP(LOGL_NOTICE, mm, "T3350 expired >= 5 times\n"); |
Jacob Erlbeck | a790456 | 2014-11-03 10:12:52 +0100 | [diff] [blame] | 2178 | mm_ctx_cleanup_free(mm, "T3350"); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2179 | /* FIXME: should we return some error? */ |
| 2180 | break; |
| 2181 | } |
| 2182 | /* re-transmit the respective msg and re-start timer */ |
| 2183 | switch (mm->t3350_mode) { |
| 2184 | case GMM_T3350_MODE_ATT: |
| 2185 | gsm48_tx_gmm_att_ack(mm); |
| 2186 | break; |
| 2187 | case GMM_T3350_MODE_RAU: |
| 2188 | gsm48_tx_gmm_ra_upd_ack(mm); |
| 2189 | break; |
| 2190 | case GMM_T3350_MODE_PTMSI_REALL: |
| 2191 | /* FIXME */ |
| 2192 | break; |
Jacob Erlbeck | 93eae8e | 2014-10-28 12:23:29 +0100 | [diff] [blame] | 2193 | case GMM_T3350_MODE_NONE: |
| 2194 | LOGMMCTXP(LOGL_NOTICE, mm, |
| 2195 | "T3350 mode wasn't set, ignoring timeout\n"); |
| 2196 | break; |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2197 | } |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 2198 | seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3350, OSMO_TDEF_S, -1); |
| 2199 | osmo_timer_schedule(&mm->timer, seconds, 0); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2200 | break; |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 2201 | case 3360: /* waiting for AUTH AND CIPH RESP */ |
| 2202 | if (mm->num_T_exp >= 5) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2203 | LOGMMCTXP(LOGL_NOTICE, mm, "T3360 expired >= 5 times\n"); |
Jacob Erlbeck | a790456 | 2014-11-03 10:12:52 +0100 | [diff] [blame] | 2204 | mm_ctx_cleanup_free(mm, "T3360"); |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 2205 | break; |
| 2206 | } |
Jacob Erlbeck | bd0cf11 | 2014-12-01 12:33:33 +0100 | [diff] [blame] | 2207 | /* Re-transmit the respective msg and re-start timer */ |
| 2208 | if (mm->auth_triplet.key_seq == GSM_KEY_SEQ_INVAL) { |
| 2209 | LOGMMCTXP(LOGL_ERROR, mm, |
| 2210 | "timeout: invalid auth triplet reference\n"); |
| 2211 | mm_ctx_cleanup_free(mm, "T3360"); |
| 2212 | break; |
| 2213 | } |
| 2214 | at = &mm->auth_triplet; |
| 2215 | |
Max | 3b6332f | 2017-11-01 13:28:38 +0100 | [diff] [blame] | 2216 | rc = gsm48_tx_gmm_auth_ciph_req(mm, &at->vec, at->key_seq, false); |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 2217 | if (rc < 0) { |
Ruben Undheim | 55fcf11 | 2018-09-25 22:59:34 +0200 | [diff] [blame] | 2218 | LOGMMCTXP(LOGL_ERROR, mm, "failed sending Auth. & Ciph. Request: %s \n", strerror(-rc)); |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 2219 | } else { |
| 2220 | seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3360, OSMO_TDEF_S, -1); |
| 2221 | osmo_timer_schedule(&mm->timer, seconds, 0); |
| 2222 | } |
Harald Welte | 4b6ac1e | 2010-07-03 11:09:06 +0200 | [diff] [blame] | 2223 | break; |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2224 | case 3370: /* waiting for IDENTITY RESPONSE */ |
| 2225 | if (mm->num_T_exp >= 5) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2226 | LOGMMCTXP(LOGL_NOTICE, mm, "T3370 expired >= 5 times\n"); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2227 | gsm48_tx_gmm_att_rej(mm, GMM_CAUSE_MS_ID_NOT_DERIVED); |
Pau Espin Pedrol | f025e58 | 2021-04-13 11:58:59 +0200 | [diff] [blame] | 2228 | mm_ctx_cleanup_free(mm, "GMM ATTACH REJECT (T3370)"); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2229 | break; |
| 2230 | } |
| 2231 | /* re-tranmit IDENTITY REQUEST and re-start timer */ |
| 2232 | gsm48_tx_gmm_id_req(mm, mm->t3370_id_type); |
Pau Espin Pedrol | a299d65 | 2019-08-14 19:11:10 +0200 | [diff] [blame] | 2233 | seconds = osmo_tdef_get(sgsn->cfg.T_defs, 3370, OSMO_TDEF_S, -1); |
| 2234 | osmo_timer_schedule(&mm->timer, seconds, 0); |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2235 | break; |
| 2236 | default: |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2237 | LOGMMCTXP(LOGL_ERROR, mm, "timer expired in unknown mode %u\n", |
Harald Welte | c2e8cc4 | 2010-05-31 20:23:38 +0200 | [diff] [blame] | 2238 | mm->T); |
| 2239 | } |
| 2240 | } |
| 2241 | |
Max | b997f84 | 2016-07-06 15:57:01 +0200 | [diff] [blame] | 2242 | int gsm0408_gprs_force_reattach_oldmsg(struct msgb *msg, |
| 2243 | struct gprs_llc_llme *llme) |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2244 | { |
Jacob Erlbeck | abdf02b | 2014-10-31 12:20:49 +0100 | [diff] [blame] | 2245 | int rc; |
Alexander Couzens | a173566 | 2016-08-30 18:50:58 +0200 | [diff] [blame] | 2246 | if (llme) |
| 2247 | gprs_llgmm_reset_oldmsg(msg, GPRS_SAPI_GMM, llme); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2248 | |
Jacob Erlbeck | abdf02b | 2014-10-31 12:20:49 +0100 | [diff] [blame] | 2249 | rc = gsm48_tx_gmm_detach_req_oldmsg( |
| 2250 | msg, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2251 | |
Jacob Erlbeck | abdf02b | 2014-10-31 12:20:49 +0100 | [diff] [blame] | 2252 | return rc; |
| 2253 | } |
| 2254 | |
| 2255 | int gsm0408_gprs_force_reattach(struct sgsn_mm_ctx *mmctx) |
| 2256 | { |
| 2257 | int rc; |
Harald Welte | dbc72b3 | 2015-12-25 22:23:27 +0100 | [diff] [blame] | 2258 | if (mmctx->ran_type == MM_CTX_T_GERAN_Gb) |
| 2259 | gprs_llgmm_reset(mmctx->gb.llme); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2260 | |
Jacob Erlbeck | b1c074f | 2014-10-31 12:27:11 +0100 | [diff] [blame] | 2261 | rc = gsm48_tx_gmm_detach_req( |
| 2262 | mmctx, GPRS_DET_T_MT_REATT_REQ, GMM_CAUSE_IMPL_DETACHED); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2263 | |
Jacob Erlbeck | b1c074f | 2014-10-31 12:27:11 +0100 | [diff] [blame] | 2264 | mm_ctx_cleanup_free(mmctx, "forced reattach"); |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2265 | |
Jacob Erlbeck | b1c074f | 2014-10-31 12:27:11 +0100 | [diff] [blame] | 2266 | return rc; |
Jacob Erlbeck | 78ecaf0 | 2014-09-05 14:32:36 +0200 | [diff] [blame] | 2267 | } |
| 2268 | |
Harald Welte | 5bfe499 | 2010-06-09 11:22:47 +0200 | [diff] [blame] | 2269 | int gprs_gmm_rx_suspend(struct gprs_ra_id *raid, uint32_t tlli) |
| 2270 | { |
| 2271 | struct sgsn_mm_ctx *mmctx; |
| 2272 | |
| 2273 | mmctx = sgsn_mm_ctx_by_tlli(tlli, raid); |
| 2274 | if (!mmctx) { |
| 2275 | LOGP(DMM, LOGL_NOTICE, "SUSPEND request for unknown " |
| 2276 | "TLLI=%08x\n", tlli); |
| 2277 | return -EINVAL; |
| 2278 | } |
| 2279 | |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 2280 | if (!gmm_fsm_is_registered(mmctx->gmm_fsm)) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2281 | LOGMMCTXP(LOGL_NOTICE, mmctx, "SUSPEND request while state " |
Harald Welte | 5bfe499 | 2010-06-09 11:22:47 +0200 | [diff] [blame] | 2282 | "!= REGISTERED (TLLI=%08x)\n", tlli); |
| 2283 | return -EINVAL; |
| 2284 | } |
| 2285 | |
| 2286 | /* Transition from REGISTERED_NORMAL to REGISTERED_SUSPENDED */ |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 2287 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_SUSPEND, NULL); |
Harald Welte | 5bfe499 | 2010-06-09 11:22:47 +0200 | [diff] [blame] | 2288 | return 0; |
| 2289 | } |
| 2290 | |
| 2291 | int gprs_gmm_rx_resume(struct gprs_ra_id *raid, uint32_t tlli, |
| 2292 | uint8_t suspend_ref) |
| 2293 | { |
| 2294 | struct sgsn_mm_ctx *mmctx; |
| 2295 | |
| 2296 | /* FIXME: make use of suspend reference? */ |
| 2297 | |
| 2298 | mmctx = sgsn_mm_ctx_by_tlli(tlli, raid); |
| 2299 | if (!mmctx) { |
| 2300 | LOGP(DMM, LOGL_NOTICE, "RESUME request for unknown " |
| 2301 | "TLLI=%08x\n", tlli); |
| 2302 | return -EINVAL; |
| 2303 | } |
| 2304 | |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 2305 | if (!gmm_fsm_is_registered(mmctx->gmm_fsm)) { |
Daniel Willmann | 4655314 | 2014-09-03 17:46:44 +0200 | [diff] [blame] | 2306 | LOGMMCTXP(LOGL_NOTICE, mmctx, "RESUME request while state " |
Harald Welte | 5bfe499 | 2010-06-09 11:22:47 +0200 | [diff] [blame] | 2307 | "!= SUSPENDED (TLLI=%08x)\n", tlli); |
| 2308 | /* FIXME: should we not simply ignore it? */ |
| 2309 | return -EINVAL; |
| 2310 | } |
| 2311 | |
| 2312 | /* Transition from SUSPENDED to NORMAL */ |
Pau Espin Pedrol | 31c4657 | 2019-09-02 16:45:27 +0200 | [diff] [blame] | 2313 | osmo_fsm_inst_dispatch(mmctx->gmm_fsm, E_GMM_RESUME, NULL); |
Harald Welte | 5bfe499 | 2010-06-09 11:22:47 +0200 | [diff] [blame] | 2314 | return 0; |
| 2315 | } |
Pau Espin Pedrol | 05d5f28 | 2022-12-23 17:09:08 +0100 | [diff] [blame] | 2316 | |
| 2317 | /* Has to be called whenever any PDU (signaling, data, ...) has been received */ |
| 2318 | void gprs_gb_recv_pdu(struct sgsn_mm_ctx *mmctx, const struct msgb *msg) |
| 2319 | { |
| 2320 | msgid2mmctx(mmctx, msg); |
| 2321 | if (mmctx->gb.llme) |
| 2322 | osmo_fsm_inst_dispatch(mmctx->gb.mm_state_fsm, E_MM_PDU_RECEPTION, NULL); |
| 2323 | } |
| 2324 | |
| 2325 | /* Main entry point for incoming 04.08 GPRS messages from Gb */ |
| 2326 | int gsm0408_gprs_rcvmsg_gb(struct msgb *msg, struct gprs_llc_llme *llme, |
| 2327 | bool drop_cipherable) |
| 2328 | { |
| 2329 | struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); |
| 2330 | uint8_t pdisc = gsm48_hdr_pdisc(gh); |
| 2331 | struct sgsn_mm_ctx *mmctx; |
| 2332 | struct gprs_ra_id ra_id; |
| 2333 | int rc = -EINVAL; |
| 2334 | |
| 2335 | bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); |
| 2336 | mmctx = sgsn_mm_ctx_by_tlli(msgb_tlli(msg), &ra_id); |
| 2337 | if (mmctx) { |
| 2338 | rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PKTS_SIG_IN)); |
| 2339 | mmctx->gb.llme = llme; |
| 2340 | gprs_gb_recv_pdu(mmctx, msg); |
| 2341 | } |
| 2342 | |
| 2343 | /* MMCTX can be NULL */ |
| 2344 | |
| 2345 | switch (pdisc) { |
| 2346 | case GSM48_PDISC_MM_GPRS: |
| 2347 | rc = gsm0408_rcv_gmm(mmctx, msg, llme, drop_cipherable); |
| 2348 | break; |
| 2349 | case GSM48_PDISC_SM_GPRS: |
| 2350 | rc = gsm0408_rcv_gsm(mmctx, msg, llme); |
| 2351 | break; |
| 2352 | default: |
| 2353 | LOGMMCTXP(LOGL_NOTICE, mmctx, |
| 2354 | "Unknown GSM 04.08 discriminator 0x%02x: %s\n", |
| 2355 | pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); |
| 2356 | /* FIXME: return status message */ |
| 2357 | break; |
| 2358 | } |
| 2359 | |
| 2360 | /* MMCTX can be invalid */ |
| 2361 | |
| 2362 | return rc; |
| 2363 | } |