diff options
Diffstat (limited to 'src/sgsn/gprs_ranap.c')
-rw-r--r-- | src/sgsn/gprs_ranap.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/sgsn/gprs_ranap.c b/src/sgsn/gprs_ranap.c new file mode 100644 index 000000000..7a3349192 --- /dev/null +++ b/src/sgsn/gprs_ranap.c @@ -0,0 +1,260 @@ +/* Messages on the RANAP interface (Iu mode) */ + +/* (C) 2009-2015 by Harald Welte <laforge@gnumonks.org> + * (C) 2015 by Holger Hans Peter Freyther + * (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 "bscconfig.h" +#include <gtp.h> + +#include <osmocom/core/rate_ctr.h> +#include <osmocom/core/tdef.h> + +#include <osmocom/ranap/ranap_common.h> + +#include <osmocom/sgsn/gprs_gmm.h> +#include <osmocom/sgsn/gprs_sm.h> +#include <osmocom/sgsn/debug.h> +#include <osmocom/sgsn/sgsn.h> +#include <osmocom/sgsn/gprs_ranap.h> +#include <osmocom/sgsn/gprs_gmm_attach.h> +#include <osmocom/sgsn/gprs_mm_state_iu_fsm.h> + +/* Send RAB activation requests for all PDP contexts */ +void activate_pdp_rabs(struct sgsn_mm_ctx *ctx) +{ + struct sgsn_pdp_ctx *pdp; + if (ctx->ran_type != MM_CTX_T_UTRAN_Iu) + return; + llist_for_each_entry(pdp, &ctx->pdp_list, list) { + iu_rab_act_ps(pdp->nsapi, pdp); + } +} + +/* Callback for RAB assignment response */ +static int sgsn_ranap_rab_ass_resp(struct sgsn_mm_ctx *ctx, RANAP_RAB_SetupOrModifiedItemIEs_t *setup_ies) +{ + uint8_t rab_id; + bool require_pdp_update = false; + struct sgsn_pdp_ctx *pdp = NULL; + RANAP_RAB_SetupOrModifiedItem_t *item = &setup_ies->raB_SetupOrModifiedItem; + + rab_id = item->rAB_ID.buf[0]; + + pdp = sgsn_pdp_ctx_by_nsapi(ctx, rab_id); + if (!pdp) { + LOGP(DRANAP, LOGL_ERROR, "RAB Assignment Response for unknown RAB/NSAPI=%u\n", rab_id); + return -1; + } + + if (item->transportLayerAddress) { + LOGPC(DRANAP, LOGL_INFO, " Setup: (%u/%s)", rab_id, osmo_hexdump(item->transportLayerAddress->buf, + item->transportLayerAddress->size)); + switch (item->transportLayerAddress->size) { + case 7: + /* It must be IPv4 inside a X213 NSAP */ + memcpy(pdp->lib->gsnlu.v, &item->transportLayerAddress->buf[3], 4); + break; + case 4: + /* It must be a raw IPv4 address */ + memcpy(pdp->lib->gsnlu.v, item->transportLayerAddress->buf, 4); + break; + case 16: + /* TODO: It must be a raw IPv6 address */ + case 19: + /* TODO: It must be IPv6 inside a X213 NSAP */ + default: + LOGP(DRANAP, LOGL_ERROR, "RAB Assignment Resp: Unknown " + "transport layer address size %u\n", + item->transportLayerAddress->size); + return -1; + } + require_pdp_update = true; + } + + /* The TEI on the RNC side might have changed, too */ + if (item->iuTransportAssociation && + item->iuTransportAssociation->present == RANAP_IuTransportAssociation_PR_gTP_TEI && + item->iuTransportAssociation->choice.gTP_TEI.buf && + item->iuTransportAssociation->choice.gTP_TEI.size >= 4) { + uint32_t tei = osmo_load32be(item->iuTransportAssociation->choice.gTP_TEI.buf); + LOGP(DRANAP, LOGL_DEBUG, "Updating TEID on RNC side from 0x%08x to 0x%08x\n", + pdp->lib->teid_own, tei); + pdp->lib->teid_own = tei; + require_pdp_update = true; + } + + if (require_pdp_update) + gtp_update_context(pdp->ggsn->gsn, pdp->lib, pdp, &pdp->lib->hisaddr0); + + if (pdp->state != PDP_STATE_CR_CONF) { + send_act_pdp_cont_acc(pdp); + pdp->state = PDP_STATE_CR_CONF; + } + return 0; + +} + +int sgsn_ranap_iu_event(struct ranap_ue_conn_ctx *ctx, enum ranap_iu_event_type type, void *data) +{ + struct sgsn_mm_ctx *mm; + int rc = -1; + + mm = sgsn_mm_ctx_by_ue_ctx(ctx); + if (!mm) { + LOGIUP(ctx, LOGL_NOTICE, "Cannot find mm ctx for IU event %d\n", type); + ranap_iu_free_ue(ctx); + return rc; + } + + switch (type) { + case RANAP_IU_EVENT_RAB_ASSIGN: + rc = sgsn_ranap_rab_ass_resp(mm, (RANAP_RAB_SetupOrModifiedItemIEs_t *)data); + break; + case RANAP_IU_EVENT_IU_RELEASE: + /* fall thru */ + case RANAP_IU_EVENT_LINK_INVALIDATED: + /* Clean up ranap_ue_conn_ctx here */ + LOGMMCTXP(LOGL_INFO, mm, "IU release for imsi %s\n", mm->imsi); + if (mm->iu.mm_state_fsm->state == ST_PMM_CONNECTED) + osmo_fsm_inst_dispatch(mm->iu.mm_state_fsm, E_PMM_PS_CONN_RELEASE, NULL); + else + sgsn_ranap_iu_free(mm); + + /* TODO: move this into FSM */ + if (mm->ran_type == MM_CTX_T_UTRAN_Iu && mm->gmm_att_req.fsm->state != ST_INIT) + osmo_fsm_inst_dispatch(mm->gmm_att_req.fsm, E_REJECT, (void *) GMM_DISCARD_MS_WITHOUT_REJECT); + rc = 0; + break; + case RANAP_IU_EVENT_SECURITY_MODE_COMPLETE: + /* Continue authentication here */ + mm->iu.ue_ctx->integrity_active = 1; + ranap_iu_tx_common_id(mm->iu.ue_ctx, mm->imsi); + + /* FIXME: remove gmm_authorize */ + if (mm->pending_req != GSM48_MT_GMM_ATTACH_REQ) + gsm48_gmm_authorize(mm); + else + osmo_fsm_inst_dispatch(mm->gmm_att_req.fsm, E_IU_SECURITY_CMD_COMPLETE, NULL); + rc = 0; + break; + default: + LOGMMCTXP(LOGL_NOTICE, mm, "Unknown event received: %i\n", type); + rc = -1; + break; + } + return rc; +} + +void sgsn_ranap_iu_free(struct sgsn_mm_ctx *ctx) +{ + if (!ctx) + return; + + if (!ctx->iu.ue_ctx) + return; + + ranap_iu_free_ue(ctx->iu.ue_ctx); + ctx->iu.ue_ctx = NULL; +} + +void sgsn_ranap_iu_release_free(struct sgsn_mm_ctx *ctx, + const struct RANAP_Cause *cause) +{ + unsigned long X1001; + + if (!ctx) + return; + + if (!ctx->iu.ue_ctx) + return; + + X1001 = osmo_tdef_get(sgsn->cfg.T_defs, -1001, OSMO_TDEF_S, -1); + + ranap_iu_tx_release_free(ctx->iu.ue_ctx, + cause, + (int) X1001); + ctx->iu.ue_ctx = NULL; +} + +int iu_rab_act_ps(uint8_t rab_id, struct sgsn_pdp_ctx *pdp) +{ + struct msgb *msg; + struct sgsn_mm_ctx *mm = pdp->mm; + struct ranap_ue_conn_ctx *uectx; + uint32_t ggsn_ip; + bool use_x213_nsap; + + uectx = mm->iu.ue_ctx; + use_x213_nsap = (uectx->rab_assign_addr_enc == RANAP_NSAP_ADDR_ENC_X213); + + /* Get the IP address for ggsn user plane */ + memcpy(&ggsn_ip, pdp->lib->gsnru.v, pdp->lib->gsnru.l); + ggsn_ip = htonl(ggsn_ip); + + LOGP(DRANAP, LOGL_DEBUG, "Assigning RAB: rab_id=%d, ggsn_ip=%x," + " teid_gn=%x, use_x213_nsap=%d\n", + rab_id, ggsn_ip, pdp->lib->teid_gn, use_x213_nsap); + + msg = ranap_new_msg_rab_assign_data(rab_id, ggsn_ip, + pdp->lib->teid_gn, use_x213_nsap); + msg->l2h = msg->data; + return ranap_iu_rab_act(uectx, msg); +} + + +/* Main entry point for incoming 04.08 GPRS messages from Iu */ +int gsm0408_gprs_rcvmsg_iu(struct msgb *msg, struct gprs_ra_id *ra_id, + uint16_t *sai) +{ + struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_gmmh(msg); + uint8_t pdisc = gsm48_hdr_pdisc(gh); + struct sgsn_mm_ctx *mmctx; + int rc = -EINVAL; + + mmctx = sgsn_mm_ctx_by_ue_ctx(MSG_IU_UE_CTX(msg)); + if (mmctx) { + rate_ctr_inc(&mmctx->ctrg->ctr[GMM_CTR_PKTS_SIG_IN]); + if (ra_id) + memcpy(&mmctx->ra, ra_id, sizeof(mmctx->ra)); + } + + /* MMCTX can be NULL */ + + switch (pdisc) { + case GSM48_PDISC_MM_GPRS: + rc = gsm0408_rcv_gmm(mmctx, msg, NULL, false); +#pragma message "set drop_cipherable arg for gsm0408_rcv_gmm() from IuPS?" + break; + case GSM48_PDISC_SM_GPRS: + rc = gsm0408_rcv_gsm(mmctx, msg, NULL); + break; + default: + LOGMMCTXP(LOGL_NOTICE, mmctx, + "Unknown GSM 04.08 discriminator 0x%02x: %s\n", + pdisc, osmo_hexdump((uint8_t *)gh, msgb_l3len(msg))); + /* FIXME: return status message */ + break; + } + + /* MMCTX can be invalid */ + + return rc; +} |