/* Section "9.5 GPRS Session Management Messages" * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */ /* (C) 2009-2015 by Harald Welte * (C) 2010 by On-Waves * (C) 2019 by sysmocom s.f.m.c. GmbH * * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include "config.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 3GPP TS 04.08 sec 6.1.3.4.3(.a) "Abnormal cases" */ #define T339X_MAX_RETRANS 4 static const struct tlv_definition gsm48_sm_att_tlvdef = { .def = { [GSM48_IE_GSM_APN] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_PROTO_CONF_OPT] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_PDP_ADDR] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_AA_TMR] = { TLV_TYPE_TV, 1 }, [GSM48_IE_GSM_NAME_FULL] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_NAME_SHORT] = { TLV_TYPE_TLV, 0 }, [GSM48_IE_GSM_TIMEZONE] = { TLV_TYPE_FIXED, 1 }, [GSM48_IE_GSM_UTC_AND_TZ] = { TLV_TYPE_FIXED, 7 }, [GSM48_IE_GSM_LSA_ID] = { TLV_TYPE_TLV, 0 }, }, }; static struct gsm48_qos default_qos = { .delay_class = 4, /* best effort */ .reliab_class = GSM48_QOS_RC_LLC_UN_RLC_ACK_DATA_PROT, .peak_tput = GSM48_QOS_PEAK_TPUT_32000bps, .preced_class = GSM48_QOS_PC_NORMAL, .mean_tput = GSM48_QOS_MEAN_TPUT_BEST_EFFORT, .traf_class = GSM48_QOS_TC_INTERACTIVE, .deliv_order = GSM48_QOS_DO_UNORDERED, .deliv_err_sdu = GSM48_QOS_ERRSDU_YES, .max_sdu_size = GSM48_QOS_MAXSDU_1520, .max_bitrate_up = GSM48_QOS_MBRATE_63k, .max_bitrate_down = GSM48_QOS_MBRATE_63k, .resid_ber = GSM48_QOS_RBER_5e_2, .sdu_err_ratio = GSM48_QOS_SERR_1e_2, .handling_prio = 3, .xfer_delay = 0x10, /* 200ms */ .guar_bitrate_up = GSM48_QOS_MBRATE_0k, .guar_bitrate_down = GSM48_QOS_MBRATE_0k, .sig_ind = 0, /* not optimised for signalling */ .max_bitrate_down_ext = 0, /* use octet 9 */ .guar_bitrate_down_ext = 0, /* use octet 13 */ }; /* GPRS SESSION MANAGEMENT */ static void pdpctx_timer_cb(void *_mm); static void pdpctx_timer_rearm(struct sgsn_pdp_ctx *pdp, unsigned int T) { unsigned long seconds; if (osmo_timer_pending(&pdp->timer)) LOGPDPCTXP(LOGL_ERROR, pdp, "Scheduling PDP timer %u while old " "timer %u pending\n", T, pdp->T); seconds = osmo_tdef_get(sgsn->cfg.T_defs, T, OSMO_TDEF_S, -1); osmo_timer_schedule(&pdp->timer, seconds, 0); } static void pdpctx_timer_start(struct sgsn_pdp_ctx *pdp, unsigned int T) { if (osmo_timer_pending(&pdp->timer)) LOGPDPCTXP(LOGL_ERROR, pdp, "Starting PDP timer %u while old " "timer %u pending\n", T, pdp->T); pdp->T = T; pdp->num_T_exp = 0; osmo_timer_setup(&pdp->timer, pdpctx_timer_cb, pdp); pdpctx_timer_rearm(pdp, pdp->T); } static void pdpctx_timer_stop(struct sgsn_pdp_ctx *pdp, unsigned int T) { if (!osmo_timer_pending(&pdp->timer)) { LOGPDPCTXP(LOGL_NOTICE, pdp, "Stopping *inactive* PDP timer %u\n", T); return; } if (pdp->T != T) { LOGPDPCTXP(LOGL_ERROR, pdp, "Stopping PDP timer %u but " "%u is running\n", T, pdp->T); } osmo_timer_del(&pdp->timer); } void pdp_ctx_detach_mm_ctx(struct sgsn_pdp_ctx *pdp) { /* Detach from MM context */ llist_del(&pdp->list); pdp->mm = NULL; /* stop timer 3395 */ pdpctx_timer_stop(pdp, 3395); } #if 0 static void msgb_put_pdp_addr_ipv4(struct msgb *msg, uint32_t ipaddr) { uint8_t v[6]; v[0] = PDP_TYPE_ORG_IETF; v[1] = PDP_TYPE_N_IETF_IPv4; *(uint32_t *)(v+2) = htonl(ipaddr); msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); } static void msgb_put_pdp_addr_ppp(struct msgb *msg) { uint8_t v[2]; v[0] = PDP_TYPE_ORG_ETSI; v[1] = PDP_TYPE_N_ETSI_PPP; msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, sizeof(v), v); } #endif /* Chapter 9.4.18 */ static int _tx_status(struct msgb *msg, uint8_t cause, struct sgsn_mm_ctx *mmctx) { struct gsm48_hdr *gh; /* MMCTX might be NULL! */ DEBUGP(DMM, "<- GPRS MM STATUS (cause: %s)\n", get_value_string(gsm48_gmm_cause_names, cause)); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1); gh->proto_discr = GSM48_PDISC_SM_GPRS; gh->msg_type = GSM48_MT_GSM_STATUS; gh->data[0] = cause; return gsm48_gmm_sendmsg(msg, 0, mmctx, true); } static int gsm48_tx_sm_status(struct sgsn_mm_ctx *mmctx, uint8_t cause) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 SM STATUS"); mmctx2msgid(msg, mmctx); return _tx_status(msg, cause, mmctx); } /* 3GPP TS 24.008 § 9.5.2: Activate PDP Context Accept */ int gsm48_tx_gsm_act_pdp_acc(struct sgsn_pdp_ctx *pdp) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP ACC"); struct gsm48_hdr *gh; uint8_t transaction_id = pdp->ti ^ 0x8; /* flip */ LOGPDPCTXP(LOGL_INFO, pdp, "<- ACTIVATE PDP CONTEXT ACK\n"); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_ACCEPT)); mmctx2msgid(msg, pdp->mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_ACT_PDP_ACK; /* Negotiated LLC SAPI */ msgb_v_put(msg, pdp->sapi); /* FIXME: copy QoS parameters from original request */ //msgb_lv_put(msg, pdp->lib->qos_neg.l, pdp->lib->qos_neg.v); msgb_lv_put(msg, sizeof(default_qos), (uint8_t *)&default_qos); /* Radio priority 10.5.7.2 */ msgb_v_put(msg, pdp->lib->radio_pri); /* PDP address */ /* Highest 4 bits of first byte need to be set to 1, otherwise * the IE is identical with the 04.08 PDP Address IE */ pdp->lib->eua.v[0] &= ~0xf0; msgb_tlv_put(msg, GSM48_IE_GSM_PDP_ADDR, pdp->lib->eua.l, pdp->lib->eua.v); pdp->lib->eua.v[0] |= 0xf0; /* Optional: Protocol configuration options (FIXME: why 'req') */ if (pdp->lib->pco_req.l) msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pdp->lib->pco_req.l, pdp->lib->pco_req.v); /* Optional: Packet Flow Identifier */ return gsm48_gmm_sendmsg(msg, 0, pdp->mm, true); } /* 3GPP TS 24.008 § 9.5.3: Activate PDP Context reject */ int gsm48_tx_gsm_act_pdp_rej(struct sgsn_mm_ctx *mm, uint8_t tid, uint8_t cause, uint8_t pco_len, uint8_t *pco_v) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP REJ"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ LOGMMCTXP(LOGL_NOTICE, mm, "<- ACTIVATE PDP CONTEXT REJ: %s\n", get_value_string(gsm48_gsm_cause_names, cause)); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_REJECT)); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_ACT_PDP_REJ; msgb_v_put(msg, cause); if (pco_len && pco_v) msgb_tlv_put(msg, GSM48_IE_GSM_PROTO_CONF_OPT, pco_len, pco_v); return gsm48_gmm_sendmsg(msg, 0, mm, true); } /* 3GPP TS 24.008 § 9.5.8: Deactivate PDP Context Request */ static int _gsm48_tx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, uint8_t tid, uint8_t sm_cause, bool teardown) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET REQ"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ uint8_t tear_down_ind = (0x9 << 4) | (!!teardown); LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT REQ\n"); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_DL_DEACTIVATE_REQUEST)); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_DEACT_PDP_REQ; msgb_v_put(msg, sm_cause); msgb_v_put(msg, tear_down_ind); return gsm48_gmm_sendmsg(msg, 0, mm, true); } int gsm48_tx_gsm_deact_pdp_req(struct sgsn_pdp_ctx *pdp, uint8_t sm_cause, bool teardown) { pdpctx_timer_start(pdp, 3395); return _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, sm_cause, teardown); } /* 3GPP TS 24.008 § 9.5.9: Deactivate PDP Context Accept */ static int _gsm48_tx_gsm_deact_pdp_acc(struct sgsn_mm_ctx *mm, uint8_t tid) { struct msgb *msg = gsm48_msgb_alloc_name("GSM 04.08 PDP DET ACC"); struct gsm48_hdr *gh; uint8_t transaction_id = tid ^ 0x8; /* flip */ LOGMMCTXP(LOGL_INFO, mm, "<- DEACTIVATE PDP CONTEXT ACK\n"); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_DL_DEACTIVATE_ACCEPT)); mmctx2msgid(msg, mm); gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh)); gh->proto_discr = GSM48_PDISC_SM_GPRS | (transaction_id << 4); gh->msg_type = GSM48_MT_GSM_DEACT_PDP_ACK; return gsm48_gmm_sendmsg(msg, 0, mm, true); } int gsm48_tx_gsm_deact_pdp_acc(struct sgsn_pdp_ctx *pdp) { return _gsm48_tx_gsm_deact_pdp_acc(pdp->mm, pdp->ti); } static int activate_ggsn(struct sgsn_mm_ctx *mmctx, struct sgsn_ggsn_ctx *ggsn, const uint8_t transaction_id, const uint8_t req_nsapi, const uint8_t req_llc_sapi, struct tlv_parsed *tp, int destroy_ggsn) { struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_DEBUG, mmctx, "Using GGSN %u\n", ggsn->id); ggsn->gsn = sgsn->gsn; pdp = sgsn_create_pdp_ctx(ggsn, mmctx, req_nsapi, tp); if (!pdp) return -1; /* Store SAPI and Transaction Identifier */ pdp->sapi = req_llc_sapi; pdp->ti = transaction_id; pdp->destroy_ggsn = destroy_ggsn; return 0; } static void ggsn_lookup_cb(void *arg, int status, int timeouts, struct hostent *hostent) { struct sgsn_ggsn_ctx *ggsn; struct sgsn_ggsn_lookup *lookup = arg; struct in_addr *addr = NULL; char buf[INET_ADDRSTRLEN]; /* The context is gone while we made a request */ if (!lookup->mmctx) { talloc_free(lookup->orig_msg); talloc_free(lookup); return; } if (status != ARES_SUCCESS) { struct sgsn_mm_ctx *mmctx = lookup->mmctx; LOGMMCTXP(LOGL_ERROR, mmctx, "DNS query failed.\n"); /* Need to try with three digits now */ if (lookup->state == SGSN_GGSN_2DIGIT) { char *hostname; int rc; lookup->state = SGSN_GGSN_3DIGIT; hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, lookup->apn_str, 1); LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); rc = sgsn_ares_query(sgsn, hostname, ggsn_lookup_cb, lookup); if (rc != 0) { LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't start GGSN\n"); goto reject_due_failure; } return; } LOGMMCTXP(LOGL_ERROR, mmctx, "Couldn't resolve GGSN\n"); goto reject_due_failure; } if (hostent->h_length != sizeof(struct in_addr)) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Wrong addr size(%zu)\n", sizeof(struct in_addr)); goto reject_due_failure; } /* Get the first addr from the list */ addr = (struct in_addr *) hostent->h_addr_list[0]; if (!addr) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "No host address.\n"); goto reject_due_failure; } ggsn = sgsn_ggsn_ctx_alloc(sgsn, UINT32_MAX); if (!ggsn) { LOGMMCTXP(LOGL_ERROR, lookup->mmctx, "Failed to create ggsn.\n"); goto reject_due_failure; } ggsn->remote_addr = *addr; LOGMMCTXP(LOGL_NOTICE, lookup->mmctx, "Selected %s as GGSN.\n", inet_ntop(AF_INET, addr, buf, sizeof(buf))); /* forget about the ggsn look-up */ lookup->mmctx->ggsn_lookup = NULL; activate_ggsn(lookup->mmctx, ggsn, lookup->ti, lookup->nsapi, lookup->sapi, &lookup->tp, 1); /* Now free it */ talloc_free(lookup->orig_msg); talloc_free(lookup); return; reject_due_failure: gsm48_tx_gsm_act_pdp_rej(lookup->mmctx, lookup->ti, GMM_CAUSE_NET_FAIL, 0, NULL); lookup->mmctx->ggsn_lookup = NULL; talloc_free(lookup->orig_msg); talloc_free(lookup); } static int do_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *msg, bool *delete) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); struct gsm48_act_pdp_ctx_req *act_req = (struct gsm48_act_pdp_ctx_req *) gh->data; uint8_t req_qos_len, req_pdpa_len; uint8_t *req_qos, *req_pdpa; struct tlv_parsed tp; uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_ggsn_ctx *ggsn; struct sgsn_pdp_ctx *pdp; enum gsm48_gsm_cause gsm_cause; char apn_str[GSM_APN_LENGTH] = { 0, }; char *hostname; int rc; struct gprs_llc_lle *lle; char buf[INET_ADDRSTRLEN]; LOGMMCTXP(LOGL_INFO, mmctx, "-> ACTIVATE PDP CONTEXT REQ: SAPI=%u NSAPI=%u ", act_req->req_llc_sapi, act_req->req_nsapi); /* FIXME: length checks! */ req_qos_len = act_req->data[0]; req_qos = act_req->data + 1; /* 10.5.6.5 */ req_pdpa_len = act_req->data[1 + req_qos_len]; req_pdpa = act_req->data + 1 + req_qos_len + 1; /* 10.5.6.4 */ switch (req_pdpa[0] & 0xf) { case 0x0: DEBUGPC(DMM, "ETSI "); break; case 0x1: DEBUGPC(DMM, "IETF "); break; case 0xf: DEBUGPC(DMM, "Empty "); break; } switch (req_pdpa[1]) { case 0x21: DEBUGPC(DMM, "IPv4 "); if (req_pdpa_len >= 6) { struct in_addr ia; ia.s_addr = osmo_load32be(req_pdpa+2); DEBUGPC(DMM, "%s ", inet_ntop(AF_INET, &ia, buf, sizeof(buf))); } break; case 0x57: DEBUGPC(DMM, "IPv6 "); if (req_pdpa_len >= 18) { /* FIXME: print IPv6 address */ } break; default: DEBUGPC(DMM, "0x%02x ", req_pdpa[1]); break; } LOGPC(DMM, LOGL_INFO, "\n"); /* Check if NSAPI is out of range (TS 04.65 / 7.2) */ if (act_req->req_nsapi < 5 || act_req->req_nsapi > 15) { /* Send reject with GSM_CAUSE_INV_MAND_INFO */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_INV_MAND_INFO, 0, NULL); } /* Optional: Access Point Name, Protocol Config Options */ if (req_pdpa + req_pdpa_len < msg->data + msg->len) tlv_parse(&tp, &gsm48_sm_att_tlvdef, req_pdpa + req_pdpa_len, (msg->data + msg->len) - (req_pdpa + req_pdpa_len), 0, 0); else memset(&tp, 0, sizeof(tp)); /* put the non-TLV elements in the TLV parser structure to * pass them on to the SGSN / GTP code */ tp.lv[OSMO_IE_GSM_REQ_QOS].len = req_qos_len; tp.lv[OSMO_IE_GSM_REQ_QOS].val = req_qos; tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].len = req_pdpa_len; tp.lv[OSMO_IE_GSM_REQ_PDP_ADDR].val = req_pdpa; /* Check if NSAPI is already in use */ pdp = sgsn_pdp_ctx_by_nsapi(mmctx, act_req->req_nsapi); if (pdp) { /* Make sure pdp ctx was not already torn down on GTP side */ if (!pdp->lib) { gsm_cause = GSM_CAUSE_REACT_RQD; goto no_context; } /* We already have a PDP context for this TLLI + NSAPI tuple */ if (pdp->sapi == act_req->req_llc_sapi && pdp->ti == transaction_id) { /* This apparently is a re-transmission of a PDP CTX * ACT REQ (our ACT ACK must have got dropped) */ rc = gsm48_tx_gsm_act_pdp_acc(pdp); if (rc < 0) return rc; if (pdp->mm->ran_type == MM_CTX_T_GERAN_Gb) { /* Also re-transmit the SNDCP XID message */ lle = &pdp->mm->gb.llme->lle[pdp->sapi]; rc = sndcp_sn_xid_req(lle,pdp->nsapi); if (rc < 0) return rc; } return 0; } /* Send reject with GSM_CAUSE_NSAPI_IN_USE */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_NSAPI_IN_USE, 0, NULL); } if (mmctx->ggsn_lookup) { if (mmctx->ggsn_lookup->sapi == act_req->req_llc_sapi && mmctx->ggsn_lookup->ti == transaction_id) { LOGMMCTXP(LOGL_NOTICE, mmctx, "Re-transmission while doing look-up. Ignoring.\n"); return 0; } } /* Only increment counter for a real activation, after we checked * for re-transmissions */ rate_ctr_inc(rate_ctr_group_get_ctr(mmctx->ctrg, GMM_CTR_PDP_CTX_ACT)); /* Determine GGSN based on APN and subscription options */ ggsn = sgsn_mm_ctx_find_ggsn_ctx(mmctx, &tp, &gsm_cause, apn_str); if (ggsn) return activate_ggsn(mmctx, ggsn, transaction_id, act_req->req_nsapi, act_req->req_llc_sapi, &tp, 0); if (strlen(apn_str) == 0) goto no_context; if (!sgsn->cfg.dynamic_lookup) goto no_context; /* schedule a dynamic look-up */ mmctx->ggsn_lookup = talloc_zero(tall_sgsn_ctx, struct sgsn_ggsn_lookup); if (!mmctx->ggsn_lookup) goto no_context; mmctx->ggsn_lookup->state = SGSN_GGSN_2DIGIT; mmctx->ggsn_lookup->mmctx = mmctx; strcpy(mmctx->ggsn_lookup->apn_str, apn_str); mmctx->ggsn_lookup->orig_msg = msg; mmctx->ggsn_lookup->tp = tp; mmctx->ggsn_lookup->ti = transaction_id; mmctx->ggsn_lookup->nsapi = act_req->req_nsapi; mmctx->ggsn_lookup->sapi = act_req->req_llc_sapi; hostname = osmo_apn_qualify_from_imsi(mmctx->imsi, mmctx->ggsn_lookup->apn_str, 0); LOGMMCTXP(LOGL_DEBUG, mmctx, "Going to query %s\n", hostname); rc = sgsn_ares_query(sgsn, hostname, ggsn_lookup_cb, mmctx->ggsn_lookup); if (rc != 0) { LOGMMCTXP(LOGL_ERROR, mmctx, "Failed to start ares query.\n"); goto no_context; } *delete = 0; return 0; no_context: LOGMMCTXP(LOGL_ERROR, mmctx, "No GGSN context found!\n"); return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, gsm_cause, 0, NULL); } /* 3GPP TS 24.008 § 9.5.1: Activate PDP Context Request */ static int gsm48_rx_gsm_act_pdp_req(struct sgsn_mm_ctx *mmctx, struct msgb *_msg) { bool delete = 1; struct msgb *msg; int rc; rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_ACTIVATE_REQUEST)); /* * This is painful. We might not have a static GGSN * configuration and then would need to copy the msg * and re-do most of this routine (or call it again * and make sure it only goes through the dynamic * resolving. The question is what to optimize for * and the dynamic resolution will be the right thing * in the long run. */ msg = bssgp_msgb_copy(_msg, __func__); if (!msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(_msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); LOGMMCTXP(LOGL_ERROR, mmctx, "-> ACTIVATE PDP CONTEXT REQ failed copy.\n"); /* Send reject with GSM_CAUSE_INV_MAND_INFO */ return gsm48_tx_gsm_act_pdp_rej(mmctx, transaction_id, GSM_CAUSE_NET_FAIL, 0, NULL); } rc = do_act_pdp_req(mmctx, msg, &delete); if (delete) msgb_free(msg); return rc; } /* 3GPP TS 24.008 § 9.5.8: Deactivate PDP Context Request */ static int gsm48_rx_gsm_deact_pdp_req(struct sgsn_mm_ctx *mm, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT REQ (cause: %s)\n", get_value_string(gsm48_gsm_cause_names, gh->data[0])); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_UL_DEACTIVATE_REQUEST)); pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); if (!pdp) { LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Request for " "non-existing PDP Context (IMSI=%s, TI=%u)\n", mm->imsi, transaction_id); return _gsm48_tx_gsm_deact_pdp_acc(mm, transaction_id); } if (pdp->ggsn) return sgsn_delete_pdp_ctx(pdp); /* GTP side already detached, freeing */ sgsn_pdp_ctx_free(pdp); return 0; } /* 3GPP TS 24.008 § 9.5.9: Deactivate PDP Context Accept */ static int gsm48_rx_gsm_deact_pdp_ack(struct sgsn_mm_ctx *mm, struct msgb *msg) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); uint8_t transaction_id = gsm48_hdr_trans_id(gh); struct sgsn_pdp_ctx *pdp; LOGMMCTXP(LOGL_INFO, mm, "-> DEACTIVATE PDP CONTEXT ACK\n"); rate_ctr_inc(rate_ctr_group_get_ctr(sgsn->rate_ctrs, CTR_PDP_UL_DEACTIVATE_ACCEPT)); pdp = sgsn_pdp_ctx_by_tid(mm, transaction_id); if (!pdp) { LOGMMCTXP(LOGL_NOTICE, mm, "Deactivate PDP Context Accept for " "non-existing PDP Context (IMSI=%s, TI=%u)\n", mm->imsi, transaction_id); return 0; } /* stop timer 3395 */ pdpctx_timer_stop(pdp, 3395); if (pdp->ggsn) return sgsn_delete_pdp_ctx(pdp); /* GTP side already detached, freeing */ sgsn_pdp_ctx_free(pdp); return 0; } static int gsm48_rx_gsm_status(struct sgsn_mm_ctx *ctx, struct msgb *msg) { struct gsm48_hdr *gh = msgb_l3(msg); LOGMMCTXP(LOGL_INFO, ctx, "-> GPRS SM STATUS (cause: %s)\n", get_value_string(gsm48_gsm_cause_names, gh->data[0])); return 0; } static void pdpctx_timer_cb(void *_pdp) { struct sgsn_pdp_ctx *pdp = _pdp; pdp->num_T_exp++; switch (pdp->T) { case 3395: /* waiting for PDP CTX DEACT ACK */ if (pdp->num_T_exp > T339X_MAX_RETRANS) { LOGPDPCTXP(LOGL_NOTICE, pdp, "T3395 expired > %d times\n", T339X_MAX_RETRANS); pdp->state = PDP_STATE_INACTIVE; if (pdp->ggsn) sgsn_delete_pdp_ctx(pdp); else sgsn_pdp_ctx_free(pdp); break; } _gsm48_tx_gsm_deact_pdp_req(pdp->mm, pdp->ti, GSM_CAUSE_NET_FAIL, true); pdpctx_timer_rearm(pdp, 3395); break; default: LOGPDPCTXP(LOGL_ERROR, pdp, "timer expired in unknown mode %u\n", pdp->T); } } /* GPRS Session Management */ int gsm0408_rcv_gsm(struct sgsn_mm_ctx *mmctx, struct msgb *msg, struct gprs_llc_llme *llme) { struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); int rc; /* MMCTX can be NULL when called */ if (!mmctx) { LOGGBIUP(llme, msg, LOGL_NOTICE, "Cannot handle SM for unknown MM CTX\n"); /* 6.1.3.6 */ if (gh->msg_type == GSM48_MT_GSM_STATUS) return 0; return gsm0408_gprs_force_reattach_oldmsg(msg, llme); } switch (gh->msg_type) { case GSM48_MT_GSM_ACT_PDP_REQ: rc = gsm48_rx_gsm_act_pdp_req(mmctx, msg); break; case GSM48_MT_GSM_DEACT_PDP_REQ: rc = gsm48_rx_gsm_deact_pdp_req(mmctx, msg); break; case GSM48_MT_GSM_DEACT_PDP_ACK: rc = gsm48_rx_gsm_deact_pdp_ack(mmctx, msg); break; case GSM48_MT_GSM_STATUS: rc = gsm48_rx_gsm_status(mmctx, msg); break; case GSM48_MT_GSM_REQ_PDP_ACT_REJ: case GSM48_MT_GSM_ACT_AA_PDP_REQ: case GSM48_MT_GSM_DEACT_AA_PDP_REQ: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unimplemented GSM 04.08 GSM msg type 0x%02x: %s\n", gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); break; default: LOGMMCTXP(LOGL_NOTICE, mmctx, "Unknown GSM 04.08 GSM msg type 0x%02x: %s\n", gh->msg_type, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); rc = gsm48_tx_sm_status(mmctx, GSM_CAUSE_MSGT_NOTEXIST_NOTIMPL); break; } return rc; }