| /* 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 <laforge@gnumonks.org> |
| * (C) 2010 by On-Waves |
| * (C) 2019 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * |
| * 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 <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| #include <netdb.h> |
| |
| #include "bscconfig.h" |
| |
| #include <osmocom/core/rate_ctr.h> |
| #include <osmocom/core/tdef.h> |
| #include <osmocom/gsm/apn.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| |
| #include <osmocom/sgsn/gprs_sm.h> |
| #include <osmocom/sgsn/gprs_gmm.h> |
| #include <osmocom/sgsn/gprs_utils.h> |
| #include <osmocom/sgsn/gtp_ggsn.h> |
| #include <osmocom/sgsn/sgsn.h> |
| #include <osmocom/sgsn/debug.h> |
| #include <osmocom/sgsn/gprs_llc.h> |
| #include <osmocom/sgsn/gprs_sndcp.h> |
| #include <osmocom/sgsn/gprs_ranap.h> |
| #include <osmocom/sgsn/gtp.h> |
| #include <osmocom/sgsn/pdpctx.h> |
| |
| /* 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 (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 = ntohl(*((uint32_t *) (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; |
| } |