diff options
Diffstat (limited to 'src/sgsn/sgsn_libgtp.c')
| -rw-r--r-- | src/sgsn/sgsn_libgtp.c | 842 |
1 files changed, 842 insertions, 0 deletions
diff --git a/src/sgsn/sgsn_libgtp.c b/src/sgsn/sgsn_libgtp.c new file mode 100644 index 000000000..5e3f48f3f --- /dev/null +++ b/src/sgsn/sgsn_libgtp.c @@ -0,0 +1,842 @@ +/* GPRS SGSN integration with libgtp of OpenGGSN */ +/* libgtp implements the GPRS Tunelling Protocol GTP per TS 09.60 / 29.060 */ + +/* (C) 2010 by Harald Welte <laforge@gnumonks.org> + * (C) 2010 by On-Waves + * (C) 2015 by Holger Hans Peter Freyther + * 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 <unistd.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <getopt.h> +#include <errno.h> +#include <signal.h> +#include <sys/fcntl.h> +#include <sys/stat.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> + +#include "bscconfig.h" + +#include <osmocom/core/talloc.h> +#include <osmocom/core/select.h> +#include <osmocom/core/rate_ctr.h> +#include <osmocom/gprs/gprs_bssgp.h> +#include <osmocom/gsm/protocol/gsm_04_08_gprs.h> + +#include <osmocom/sgsn/signal.h> +#include <osmocom/sgsn/debug.h> +#include <osmocom/sgsn/sgsn.h> +#include <osmocom/sgsn/gprs_llc.h> +#include <osmocom/sgsn/gprs_sgsn.h> +#include <osmocom/sgsn/gprs_gmm.h> +#include <osmocom/sgsn/gprs_subscriber.h> +#include <osmocom/sgsn/gprs_sndcp.h> +#include <osmocom/sgsn/gprs_ranap.h> + +#include <gtp.h> +#include <pdp.h> + +/* TS 23.003: The MSISDN shall take the dummy MSISDN value composed of + * 15 digits set to 0 (encoded as an E.164 international number) when + * the MSISDN is not available in messages in which the presence of the + * MSISDN parameter */ +static const uint8_t dummy_msisdn[] = + { 0x91, /* No extension, international, E.164 */ + 0, 0, 0, 0, 0, 0, 0, /* 14 digits of zeroes */ + 0xF0 /* 15th digit of zero + padding */ }; + +const struct value_string gtp_cause_strs[] = { + { GTPCAUSE_REQ_IMSI, "Request IMSI" }, + { GTPCAUSE_REQ_IMEI, "Request IMEI" }, + { GTPCAUSE_REQ_IMSI_IMEI, "Request IMSI and IMEI" }, + { GTPCAUSE_NO_ID_NEEDED, "No identity needed" }, + { GTPCAUSE_MS_REFUSES_X, "MS refuses" }, + { GTPCAUSE_MS_NOT_RESP_X, "MS is not GPRS responding" }, + { GTPCAUSE_ACC_REQ, "Request accepted" }, + { GTPCAUSE_NON_EXIST, "Non-existent" }, + { GTPCAUSE_INVALID_MESSAGE, "Invalid message format" }, + { GTPCAUSE_IMSI_NOT_KNOWN, "IMSI not known" }, + { GTPCAUSE_MS_DETACHED, "MS is GPRS detached" }, + { GTPCAUSE_MS_NOT_RESP, "MS is not GPRS responding" }, + { GTPCAUSE_MS_REFUSES, "MS refuses" }, + { GTPCAUSE_NO_RESOURCES, "No resources available" }, + { GTPCAUSE_NOT_SUPPORTED, "Service not supported" }, + { GTPCAUSE_MAN_IE_INCORRECT, "Mandatory IE incorrect" }, + { GTPCAUSE_MAN_IE_MISSING, "Mandatory IE missing" }, + { GTPCAUSE_OPT_IE_INCORRECT, "Optional IE incorrect" }, + { GTPCAUSE_SYS_FAIL, "System failure" }, + { GTPCAUSE_ROAMING_REST, "Roaming restrictions" }, + { GTPCAUSE_PTIMSI_MISMATCH, "P-TMSI Signature mismatch" }, + { GTPCAUSE_CONN_SUSP, "GPRS connection suspended" }, + { GTPCAUSE_AUTH_FAIL, "Authentication failure" }, + { GTPCAUSE_USER_AUTH_FAIL, "User authentication failed" }, + { GTPCAUSE_CONTEXT_NOT_FOUND, "Context not found" }, + { GTPCAUSE_ADDR_OCCUPIED, "All dynamic PDP addresses occupied" }, + { GTPCAUSE_NO_MEMORY, "No memory is available" }, + { GTPCAUSE_RELOC_FAIL, "Relocation failure" }, + { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, "Unknown mandatory ext. header" }, + { GTPCAUSE_SEM_ERR_TFT, "Semantic error in TFT operation" }, + { GTPCAUSE_SYN_ERR_TFT, "Syntactic error in TFT operation" }, + { GTPCAUSE_SEM_ERR_FILTER, "Semantic errors in packet filter" }, + { GTPCAUSE_SYN_ERR_FILTER, "Syntactic errors in packet filter" }, + { GTPCAUSE_MISSING_APN, "Missing or unknown APN" }, + { GTPCAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, + { 0, NULL } +}; + +/* Generate the GTP IMSI IE according to 09.60 Section 7.9.2 */ +static uint64_t imsi_str2gtp(char *str) +{ + uint64_t imsi64 = 0; + unsigned int n; + unsigned int imsi_len = strlen(str); + + if (imsi_len > 16) { + LOGP(DGPRS, LOGL_NOTICE, "IMSI length > 16 not supported!\n"); + return 0; + } + + for (n = 0; n < 16; n++) { + uint64_t val; + if (n < imsi_len) + val = (str[n]-'0') & 0xf; + else + val = 0xf; + imsi64 |= (val << (n*4)); + } + return imsi64; +} + +/* generate a PDP context based on the IE's from the 04.08 message, + * and send the GTP create pdp context request to the GGSN */ +struct sgsn_pdp_ctx *sgsn_create_pdp_ctx(struct sgsn_ggsn_ctx *ggsn, + struct sgsn_mm_ctx *mmctx, + uint16_t nsapi, + struct tlv_parsed *tp) +{ + struct gprs_ra_id raid; + struct sgsn_pdp_ctx *pctx; + struct pdp_t *pdp; + uint64_t imsi_ui64; + size_t qos_len; + const uint8_t *qos; + int rc; + + pctx = sgsn_pdp_ctx_alloc(mmctx, ggsn, nsapi); + if (!pctx) { + LOGP(DGPRS, LOGL_ERROR, "Couldn't allocate PDP Ctx\n"); + return NULL; + } + + imsi_ui64 = imsi_str2gtp(mmctx->imsi); + + rc = gtp_pdp_newpdp(ggsn->gsn, &pdp, imsi_ui64, nsapi, NULL); + if (rc) { + LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n"); + return NULL; + } + pdp->priv = pctx; + pctx->lib = pdp; + + //pdp->peer = /* sockaddr_in of GGSN (receive) */ + //pdp->ipif = /* not used by library */ + pdp->version = ggsn->gtp_version; + pdp->hisaddr0 = ggsn->remote_addr; + pdp->hisaddr1 = ggsn->remote_addr; + //pdp->cch_pdp = 512; /* Charging Flat Rate */ + + /* MS provided APN, subscription was verified by the caller */ + pdp->selmode = 0xFC | 0x00; + + /* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */ + LOGPDPCTXP(LOGL_NOTICE, pctx, "Create PDP Context\n"); + + /* Put the MSISDN in case we have it */ + if (mmctx->subscr && mmctx->subscr->sgsn_data->msisdn_len) { + pdp->msisdn.l = OSMO_MIN(mmctx->subscr->sgsn_data->msisdn_len, sizeof(pdp->msisdn.v)); + memcpy(pdp->msisdn.v, mmctx->subscr->sgsn_data->msisdn, + pdp->msisdn.l); + } else { + /* use the dummy 15-digits-zero MSISDN value */ + pdp->msisdn.l = sizeof(dummy_msisdn); + memcpy(pdp->msisdn.v, dummy_msisdn, pdp->msisdn.l); + } + + /* End User Address from GMM requested PDP address */ + pdp->eua.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_PDP_ADDR); + if (pdp->eua.l > sizeof(pdp->eua.v)) + pdp->eua.l = sizeof(pdp->eua.v); + memcpy(pdp->eua.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_PDP_ADDR), + pdp->eua.l); + /* 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->eua.v[0] |= 0xf0; + + /* APN name from GMM */ + if (TLVP_PRESENT(tp, GSM48_IE_GSM_APN)) { + pdp->apn_use.l = TLVP_LEN(tp, GSM48_IE_GSM_APN); + if (pdp->apn_use.l > sizeof(pdp->apn_use.v)) + pdp->apn_use.l = sizeof(pdp->apn_use.v); + memcpy(pdp->apn_use.v, TLVP_VAL(tp, GSM48_IE_GSM_APN), pdp->apn_use.l); + } else { + pdp->apn_use.l = 0; + } + + /* Protocol Configuration Options from GMM */ + if (TLVP_PRESENT(tp, GSM48_IE_GSM_PROTO_CONF_OPT)) { + pdp->pco_req.l = TLVP_LEN(tp, GSM48_IE_GSM_PROTO_CONF_OPT); + if (pdp->pco_req.l > sizeof(pdp->pco_req.v)) + pdp->pco_req.l = sizeof(pdp->pco_req.v); + memcpy(pdp->pco_req.v, TLVP_VAL(tp, GSM48_IE_GSM_PROTO_CONF_OPT), + pdp->pco_req.l); + } else { + pdp->pco_req.l = 0; + } + + /* QoS options from GMM or remote */ + if (TLVP_LEN(tp, OSMO_IE_GSM_SUB_QOS) > 0) { + qos_len = TLVP_LEN(tp, OSMO_IE_GSM_SUB_QOS); + qos = TLVP_VAL(tp, OSMO_IE_GSM_SUB_QOS); + } else { + qos_len = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS); + qos = TLVP_VAL(tp, OSMO_IE_GSM_REQ_QOS); + } + + if (qos_len <= 3) { + pdp->qos_req.l = qos_len + 1; + if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) + pdp->qos_req.l = sizeof(pdp->qos_req.v); + pdp->qos_req.v[0] = 0; /* Allocation/Retention policy */ + memcpy(&pdp->qos_req.v[1], qos, pdp->qos_req.l - 1); + } else { + pdp->qos_req.l = qos_len; + if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) + pdp->qos_req.l = sizeof(pdp->qos_req.v); + memcpy(pdp->qos_req.v, qos, pdp->qos_req.l); + } + + /* charging characteristics if present */ + if (TLVP_LEN(tp, OSMO_IE_GSM_CHARG_CHAR) >= sizeof(pdp->cch_pdp)) + pdp->cch_pdp = tlvp_val16be(tp, OSMO_IE_GSM_CHARG_CHAR); + + /* SGSN address for control plane */ + pdp->gsnlc.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); + memcpy(pdp->gsnlc.v, &sgsn->cfg.gtp_listenaddr.sin_addr, + sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); + + /* SGSN address for user plane + * Default to the control plane addr for now. If we are connected to a + * hnbgw via IuPS we'll need to send a PDP context update with the + * correct IP address after the RAB Assignment is complete */ + pdp->gsnlu.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); + memcpy(pdp->gsnlu.v, &sgsn->cfg.gtp_listenaddr.sin_addr, + sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); + + /* Encode RAT Type according to TS 29.060 7.7.50 */ + pdp->rattype.l = 1; + if (mmctx->ran_type == MM_CTX_T_UTRAN_Iu) + pdp->rattype.v[0] = 1; + else + pdp->rattype.v[0] = 2; + pdp->rattype_given = 1; + + /* Include RAI and ULI all the time */ + pdp->rai_given = 1; + pdp->rai.l = 6; + + /* Routing Area Identifier with LAC and RAC fixed values, as + * requested in 29.006 7.3.1 */ + raid = mmctx->ra; + raid.lac = 0xFFFE; + raid.rac = 0xFF; + gsm48_encode_ra((struct gsm48_ra_id *)pdp->rai.v, &raid); + + /* Encode User Location Information accordint to TS 29.060 7.7.51 */ + pdp->userloc_given = 1; + pdp->userloc.l = 8; + switch (mmctx->ran_type) { + case MM_CTX_T_GERAN_Gb: +#if 0 + case MM_CTX_T_GERAN_Iu: +#endif + pdp->rattype.v[0] = 2; + /* User Location Information */ + pdp->userloc_given = 1; + pdp->userloc.l = 8; + pdp->userloc.v[0] = 0; /* CGI for GERAN */ + bssgp_create_cell_id(&pdp->userloc.v[1], &mmctx->ra, mmctx->gb.cell_id); + break; + case MM_CTX_T_UTRAN_Iu: + pdp->userloc.v[0] = 1; /* SAI for UTRAN */ + /* SAI is like CGI but with SAC instead of CID, so we can abuse this function */ + bssgp_create_cell_id(&pdp->userloc.v[1], &mmctx->ra, mmctx->iu.sac); + break; + } + + /* include the IMEI(SV) */ + pdp->imeisv_given = 1; + gsm48_encode_bcd_number(&pdp->imeisv.v[0], 8, 0, mmctx->imei); + pdp->imeisv.l = pdp->imeisv.v[0]; + memmove(&pdp->imeisv.v[0], &pdp->imeisv.v[1], 8); + + /* change pdp state to 'requested' */ + pctx->state = PDP_STATE_CR_REQ; + + rc = gtp_create_context_req(ggsn->gsn, pdp, pctx); + /* FIXME */ + + return pctx; +} + +/* SGSN wants to delete a PDP context */ +int sgsn_delete_pdp_ctx(struct sgsn_pdp_ctx *pctx) +{ + LOGPDPCTXP(LOGL_INFO, pctx, "Delete PDP Context\n"); + + /* FIXME: decide if we need teardown or not ! */ + return gtp_delete_context_req2(pctx->ggsn->gsn, pctx->lib, pctx, 1); +} + +struct cause_map { + uint8_t cause_in; + uint8_t cause_out; +}; + +static uint8_t cause_map(const struct cause_map *map, uint8_t in, uint8_t deflt) +{ + const struct cause_map *m; + + for (m = map; m->cause_in && m->cause_out; m++) { + if (m->cause_in == in) + return m->cause_out; + } + return deflt; +} + +/* how do we map from gtp cause to SM cause */ +static const struct cause_map gtp2sm_cause_map[] = { + { GTPCAUSE_NO_RESOURCES, GSM_CAUSE_INSUFF_RSRC }, + { GTPCAUSE_NOT_SUPPORTED, GSM_CAUSE_SERV_OPT_NOTSUPP }, + { GTPCAUSE_MAN_IE_INCORRECT, GSM_CAUSE_INV_MAND_INFO }, + { GTPCAUSE_MAN_IE_MISSING, GSM_CAUSE_INV_MAND_INFO }, + { GTPCAUSE_OPT_IE_INCORRECT, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_SYS_FAIL, GSM_CAUSE_NET_FAIL }, + { GTPCAUSE_ROAMING_REST, GSM_CAUSE_REQ_SERV_OPT_NOTSUB }, + { GTPCAUSE_PTIMSI_MISMATCH, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_CONN_SUSP, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_AUTH_FAIL, GSM_CAUSE_AUTH_FAILED }, + { GTPCAUSE_USER_AUTH_FAIL, GSM_CAUSE_ACT_REJ_GGSN }, + { GTPCAUSE_CONTEXT_NOT_FOUND, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_ADDR_OCCUPIED, GSM_CAUSE_INSUFF_RSRC }, + { GTPCAUSE_NO_MEMORY, GSM_CAUSE_INSUFF_RSRC }, + { GTPCAUSE_RELOC_FAIL, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, GSM_CAUSE_PROTO_ERR_UNSPEC }, + { GTPCAUSE_MISSING_APN, GSM_CAUSE_MISSING_APN }, + { GTPCAUSE_UNKNOWN_PDP, GSM_CAUSE_UNKNOWN_PDP }, + { 0, 0 } +}; + +int send_act_pdp_cont_acc(struct sgsn_pdp_ctx *pctx) +{ + struct sgsn_signal_data sig_data; + int rc; + struct gprs_llc_lle *lle; + + /* Inform others about it */ + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.pdp = pctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_ACT, &sig_data); + + /* Send PDP CTX ACT to MS */ + rc = gsm48_tx_gsm_act_pdp_acc(pctx); + if (rc < 0) + return rc; + + if (pctx->mm->ran_type == MM_CTX_T_GERAN_Gb) { + /* Send SNDCP XID to MS */ + lle = &pctx->mm->gb.llme->lle[pctx->sapi]; + rc = sndcp_sn_xid_req(lle,pctx->nsapi); + if (rc < 0) + return rc; + } + + return 0; +} + +/* The GGSN has confirmed the creation of a PDP Context */ +static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) +{ + struct sgsn_pdp_ctx *pctx = cbp; + uint8_t reject_cause = 0; + + LOGPDPCTXP(LOGL_INFO, pctx, "Received CREATE PDP CTX CONF, cause=%d(%s)\n", + cause, get_value_string(gtp_cause_strs, cause)); + + if (!pctx->mm) { + goto reject; + } + + /* Check for cause value if it was really successful */ + if (cause < 0) { + LOGP(DGPRS, LOGL_NOTICE, "Create PDP ctx req timed out\n"); + if (pdp && pdp->version == 1) { + pdp->version = 0; + gtp_create_context_req(sgsn->gsn, pdp, cbp); + return 0; + } else { + reject_cause = GSM_CAUSE_NET_FAIL; + goto reject; + } + } + + /* Check for cause value if it was really successful */ + if (cause != GTPCAUSE_ACC_REQ) { + reject_cause = cause_map(gtp2sm_cause_map, cause, + GSM_CAUSE_ACT_REJ_GGSN); + goto reject; + } + + if (pctx->mm->ran_type == MM_CTX_T_GERAN_Gb) { + /* Activate the SNDCP layer */ + sndcp_sm_activate_ind(&pctx->mm->gb.llme->lle[pctx->sapi], pctx->nsapi); + return send_act_pdp_cont_acc(pctx); + } else if (pctx->mm->ran_type == MM_CTX_T_UTRAN_Iu) { +#ifdef BUILD_IU + /* Activate a radio bearer */ + iu_rab_act_ps(pdp->nsapi, pctx); + return 0; +#else + return -ENOTSUP; +#endif + } + + LOGP(DGPRS, LOGL_ERROR, "Unknown ran_type %d\n", + pctx->mm->ran_type); + reject_cause = GSM_CAUSE_PROTO_ERR_UNSPEC; + +reject: + /* + * In case of a timeout pdp will be NULL but we have a valid pointer + * in pctx->lib. For other rejects pctx->lib and pdp might be the + * same. + */ + pctx->state = PDP_STATE_NONE; + if (pctx->lib && pctx->lib != pdp) + pdp_freepdp(pctx->lib); + pctx->lib = NULL; + + if (pdp) + pdp_freepdp(pdp); + + /* Send PDP CTX ACT REJ to MS */ + if (pctx->mm) + gsm48_tx_gsm_act_pdp_rej(pctx->mm, pctx->ti, reject_cause, + 0, NULL); + sgsn_pdp_ctx_free(pctx); + + return EOF; +} + +void sgsn_pdp_upd_gtp_u(struct sgsn_pdp_ctx *pdp, void *addr, size_t alen) +{ + pdp->lib->gsnlu.l = alen; + memcpy(pdp->lib->gsnlu.v, addr, alen); + gtp_update_context(pdp->ggsn->gsn, pdp->lib, pdp, &pdp->lib->hisaddr0); +} + +void sgsn_ggsn_echo_req(struct sgsn_ggsn_ctx *ggc) +{ + LOGGGSN(ggc, LOGL_INFO, "GTP Tx Echo Request\n"); + gtp_echo_req(ggc->gsn, ggc->gtp_version, ggc, &ggc->remote_addr); +} + +/* Confirmation of a PDP Context Delete */ +static int delete_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) +{ + struct sgsn_signal_data sig_data; + struct sgsn_pdp_ctx *pctx = cbp; + int rc = 0; + + LOGPDPCTXP(LOGL_INFO, pctx, "Received DELETE PDP CTX CONF, cause=%d(%s)\n", + cause, get_value_string(gtp_cause_strs, cause)); + + memset(&sig_data, 0, sizeof(sig_data)); + sig_data.pdp = pctx; + osmo_signal_dispatch(SS_SGSN, S_SGSN_PDP_DEACT, &sig_data); + + if (pctx->mm) { + if (pctx->mm->ran_type == MM_CTX_T_GERAN_Gb) { + /* Deactivate the SNDCP layer */ + sndcp_sm_deactivate_ind(&pctx->mm->gb.llme->lle[pctx->sapi], pctx->nsapi); + } else { +#ifdef BUILD_IU + /* Deactivate radio bearer */ + ranap_iu_rab_deact(pctx->mm->iu.ue_ctx, 1); +#else + return -ENOTSUP; +#endif + } + + /* Confirm deactivation of PDP context to MS */ + rc = gsm48_tx_gsm_deact_pdp_acc(pctx); + } else { + LOGPDPCTXP(LOGL_NOTICE, pctx, + "Not deactivating SNDCP layer since the MM context " + "is not available\n"); + } + + sgsn_pdp_ctx_free(pctx); + + return rc; +} + +/* Confirmation of an GTP ECHO request */ +static int echo_conf(void *cbp, bool timeout) +{ + struct sgsn_ggsn_ctx *ggc = (struct sgsn_ggsn_ctx *)cbp; + if (timeout) { + LOGGGSN(ggc, LOGL_NOTICE, "GTP Echo Request timed out\n"); + /* FIXME: if version == 1, retry with version 0 */ + sgsn_ggsn_ctx_drop_all_pdp(ggc); + } else { + LOGGGSN(ggc, LOGL_INFO, "GTP Rx Echo Response\n"); + } + return 0; +} + +/* Any message received by GGSN contains a recovery IE */ +static int cb_recovery2(struct sockaddr_in *peer, struct pdp_t *pdp, uint8_t recovery) +{ + struct sgsn_ggsn_ctx *ggsn; + struct sgsn_pdp_ctx *pctx = NULL; + + ggsn = sgsn_ggsn_ctx_by_addr(&peer->sin_addr); + if (!ggsn) { + LOGP(DGPRS, LOGL_NOTICE, "Received Recovery IE for unknown GGSN\n"); + return -EINVAL; + } + + if (ggsn->remote_restart_ctr == -1) { + /* First received ECHO RESPONSE, note the restart ctr */ + ggsn->remote_restart_ctr = recovery; + } else if (ggsn->remote_restart_ctr != recovery) { + /* counter has changed (GGSN restart): release all PDP */ + LOGP(DGPRS, LOGL_NOTICE, "GGSN recovery (%u->%u) pdp=%p, " + "releasing all%s PDP contexts\n", + ggsn->remote_restart_ctr, recovery, pdp, pdp ? " other" : ""); + ggsn->remote_restart_ctr = recovery; + if (pdp) + pctx = pdp->priv; + sgsn_ggsn_ctx_drop_all_pdp_except(ggsn, pctx); + } + return 0; +} + +/* libgtp callback for confirmations */ +static int cb_conf(int type, int cause, struct pdp_t *pdp, void *cbp) +{ + DEBUGP(DGPRS, "libgtp cb_conf(type=%d, cause=%d, pdp=%p, cbp=%p)\n", + type, cause, pdp, cbp); + + if (cause == EOF) + LOGP(DGPRS, LOGL_ERROR, "libgtp EOF (type=%u, pdp=%p, cbp=%p)\n", + type, pdp, cbp); + + switch (type) { + case GTP_ECHO_REQ: + /* libgtp hands us the RECOVERY number instead of a cause (EOF on timeout) */ + return echo_conf(cbp, cause == EOF); + case GTP_CREATE_PDP_REQ: + return create_pdp_conf(pdp, cbp, cause); + case GTP_DELETE_PDP_REQ: + return delete_pdp_conf(pdp, cbp, cause); + default: + break; + } + return 0; +} + +/* Called whenever a PDP context is deleted for any reason */ +static int cb_delete_context(struct pdp_t *pdp) +{ + struct sgsn_pdp_ctx *pctx = pdp->priv; + + LOGPDPX(DGPRS, LOGL_INFO, pdp, "Context %p was deleted\n", pdp); + + /* unlink the now non-existing library handle from the pdp context. + This way we avoid calling pdp_freepdp() on it, since after returning + from cb_delete_context callback, libgtp is already doing so. */ + pctx->lib = NULL; + + sgsn_ggsn_ctx_drop_pdp(pctx); + return 0; +} + +/* Called when we receive a Version Not Supported message */ +static int cb_unsup_ind(struct sockaddr_in *peer) +{ + LOGP(DGPRS, LOGL_INFO, "GTP Version not supported Indication " + "from %s:%u\n", inet_ntoa(peer->sin_addr), + ntohs(peer->sin_port)); + return 0; +} + +/* Called when we receive a Supported Ext Headers Notification */ +static int cb_extheader_ind(struct sockaddr_in *peer) +{ + LOGP(DGPRS, LOGL_INFO, "GTP Supported Ext Headers Notification " + "from %s:%u\n", inet_ntoa(peer->sin_addr), + ntohs(peer->sin_port)); + return 0; +} + +/* Called whenever we receive a DATA packet */ +static int cb_data_ind(struct pdp_t *lib, void *packet, unsigned int len) +{ + struct bssgp_paging_info pinfo; + struct sgsn_pdp_ctx *pdp; + struct sgsn_mm_ctx *mm; + struct msgb *msg; + uint8_t *ud; + + pdp = lib->priv; + if (!pdp) { + LOGP(DGPRS, LOGL_NOTICE, + "GTP DATA IND from GGSN for unknown PDP\n"); + return -EIO; + } + mm = pdp->mm; + if (!mm) { + LOGP(DGPRS, LOGL_ERROR, + "PDP context (address=%u) without MM context!\n", + pdp->address); + return -EIO; + } + + DEBUGP(DGPRS, "GTP DATA IND from GGSN for %s, length=%u\n", mm->imsi, + len); + + if (mm->ran_type == MM_CTX_T_UTRAN_Iu) { +#ifdef BUILD_IU + /* Ignore the packet for now and page the UE to get the RAB + * reestablished */ + ranap_iu_page_ps(mm->imsi, &mm->p_tmsi, mm->ra.lac, mm->ra.rac); + + return 0; +#else + return -ENOTSUP; +#endif + } + + msg = msgb_alloc_headroom(len+256, 128, "GTP->SNDCP"); + ud = msgb_put(msg, len); + memcpy(ud, packet, len); + + msgb_tlli(msg) = mm->gb.tlli; + msgb_bvci(msg) = mm->gb.bvci; + msgb_nsei(msg) = mm->gb.nsei; + + switch (mm->gmm_state) { + case GMM_REGISTERED_SUSPENDED: + /* initiate PS PAGING procedure */ + memset(&pinfo, 0, sizeof(pinfo)); + pinfo.mode = BSSGP_PAGING_PS; + pinfo.scope = BSSGP_PAGING_BVCI; + pinfo.bvci = mm->gb.bvci; + pinfo.imsi = mm->imsi; + pinfo.ptmsi = &mm->p_tmsi; + pinfo.drx_params = mm->drx_parms; + pinfo.qos[0] = 0; // FIXME + bssgp_tx_paging(mm->gb.nsei, 0, &pinfo); + rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PAGING_PS]); + /* FIXME: queue the packet we received from GTP */ + break; + case GMM_REGISTERED_NORMAL: + break; + default: + LOGP(DGPRS, LOGL_ERROR, "GTP DATA IND for TLLI %08X in state " + "%u\n", mm->gb.tlli, mm->gmm_state); + msgb_free(msg); + return -1; + } + + rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_OUT]); + rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_OUT], len); + rate_ctr_inc(&mm->ctrg->ctr[GMM_CTR_PKTS_UDATA_OUT]); + rate_ctr_add(&mm->ctrg->ctr[GMM_CTR_BYTES_UDATA_OUT], len); + + /* It is easier to have a global count */ + pdp->cdr_bytes_out += len; + + return sndcp_unitdata_req(msg, &mm->gb.llme->lle[pdp->sapi], + pdp->nsapi, mm); +} + +/* Called by SNDCP when it has received/re-assembled a N-PDU */ +int sgsn_rx_sndcp_ud_ind(struct gprs_ra_id *ra_id, int32_t tlli, uint8_t nsapi, + struct msgb *msg, uint32_t npdu_len, uint8_t *npdu) +{ + struct sgsn_mm_ctx *mmctx; + struct sgsn_pdp_ctx *pdp; + + /* look-up the MM context for this message */ + mmctx = sgsn_mm_ctx_by_tlli(tlli, ra_id); + if (!mmctx) { + LOGP(DGPRS, LOGL_ERROR, + "Cannot find MM CTX for TLLI %08x\n", tlli); + return -EIO; + } + /* look-up the PDP context for this message */ + pdp = sgsn_pdp_ctx_by_nsapi(mmctx, nsapi); + if (!pdp) { + LOGP(DGPRS, LOGL_ERROR, "Cannot find PDP CTX for " + "TLLI=%08x, NSAPI=%u\n", tlli, nsapi); + return -EIO; + } + if (!pdp->lib) { + LOGP(DGPRS, LOGL_ERROR, "PDP CTX without libgtp\n"); + return -EIO; + } + + rate_ctr_inc(&pdp->ctrg->ctr[PDP_CTR_PKTS_UDATA_IN]); + rate_ctr_add(&pdp->ctrg->ctr[PDP_CTR_BYTES_UDATA_IN], npdu_len); + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_UDATA_IN]); + rate_ctr_add(&mmctx->ctrg->ctr[GMM_CTR_BYTES_UDATA_IN], npdu_len); + + /* It is easier to have a global count */ + pdp->cdr_bytes_in += npdu_len; + + return gtp_data_req(pdp->ggsn->gsn, pdp->lib, npdu, npdu_len); +} + +/* libgtp select loop integration */ +static int sgsn_gtp_fd_cb(struct osmo_fd *fd, unsigned int what) +{ + struct sgsn_instance *sgi = fd->data; + int rc; + + if (!(what & BSC_FD_READ)) + return 0; + + switch (fd->priv_nr) { + case 0: + rc = gtp_decaps0(sgi->gsn); + break; + case 1: + rc = gtp_decaps1c(sgi->gsn); + break; + case 2: + rc = gtp_decaps1u(sgi->gsn); + break; + default: + rc = -EINVAL; + break; + } + return rc; +} + +static void sgsn_gtp_tmr_start(struct sgsn_instance *sgi) +{ + struct timeval next; + + /* Retrieve next retransmission as struct timeval */ + gtp_retranstimeout(sgi->gsn, &next); + + /* re-schedule the timer */ + osmo_timer_schedule(&sgi->gtp_timer, next.tv_sec, next.tv_usec/1000); +} + +/* timer callback for libgtp retransmissions and ping */ +static void sgsn_gtp_tmr_cb(void *data) +{ + struct sgsn_instance *sgi = data; + + /* Do all the retransmissions as needed */ + gtp_retrans(sgi->gsn); + + sgsn_gtp_tmr_start(sgi); +} + +int sgsn_gtp_init(struct sgsn_instance *sgi) +{ + int rc; + struct gsn_t *gsn; + + rc = gtp_new(&sgi->gsn, sgi->cfg.gtp_statedir, + &sgi->cfg.gtp_listenaddr.sin_addr, GTP_MODE_SGSN); + if (rc) { + LOGP(DGPRS, LOGL_ERROR, "Failed to create GTP: %d\n", rc); + return rc; + } + LOGP(DGPRS, LOGL_NOTICE, "Created GTP on %s\n", inet_ntoa(sgi->cfg.gtp_listenaddr.sin_addr)); + + gsn = sgi->gsn; + + if (gsn->mode != GTP_MODE_SGSN) + return -EINVAL; + + sgi->gtp_fd0.fd = gsn->fd0; + sgi->gtp_fd0.priv_nr = 0; + sgi->gtp_fd0.data = sgi; + sgi->gtp_fd0.when = BSC_FD_READ; + sgi->gtp_fd0.cb = sgsn_gtp_fd_cb; + rc = osmo_fd_register(&sgi->gtp_fd0); + if (rc < 0) + return rc; + + sgi->gtp_fd1c.fd = gsn->fd1c; + sgi->gtp_fd1c.priv_nr = 1; + sgi->gtp_fd1c.data = sgi; + sgi->gtp_fd1c.when = BSC_FD_READ; + sgi->gtp_fd1c.cb = sgsn_gtp_fd_cb; + rc = osmo_fd_register(&sgi->gtp_fd1c); + if (rc < 0) { + osmo_fd_unregister(&sgi->gtp_fd0); + return rc; + } + + sgi->gtp_fd1u.fd = gsn->fd1u; + sgi->gtp_fd1u.priv_nr = 2; + sgi->gtp_fd1u.data = sgi; + sgi->gtp_fd1u.when = BSC_FD_READ; + sgi->gtp_fd1u.cb = sgsn_gtp_fd_cb; + rc = osmo_fd_register(&sgi->gtp_fd1u); + if (rc < 0) { + osmo_fd_unregister(&sgi->gtp_fd0); + osmo_fd_unregister(&sgi->gtp_fd1c); + return rc; + } + + /* Start GTP re-transmission timer */ + osmo_timer_setup(&sgi->gtp_timer, sgsn_gtp_tmr_cb, sgi); + sgsn_gtp_tmr_start(sgi); + + /* Register callbackcs with libgtp */ + gtp_set_cb_delete_context(gsn, cb_delete_context); + gtp_set_cb_conf(gsn, cb_conf); + gtp_set_cb_recovery2(gsn, cb_recovery2); + gtp_set_cb_data_ind(gsn, cb_data_ind); + gtp_set_cb_unsup_ind(gsn, cb_unsup_ind); + gtp_set_cb_extheader_ind(gsn, cb_extheader_ind); + + return 0; +} |