128 lines
4.5 KiB
C
128 lines
4.5 KiB
C
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#include <stdio.h>
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#include <errno.h>
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#include <stdint.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/gsm/tlv.h>
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#include <osmocom/vty/logging.h>
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#include <osmocom/gprs/gprs_ns.h>
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#include <osmocom/gprs/gprs_bssgp.h>
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#include <osmocom/gprs/gprs_bssgp_rim.h>
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#include <osmocom/sgsn/sgsn_rim.h>
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#include <osmocom/sgsn/gtp_mme.h>
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#include <osmocom/sgsn/gtp.h>
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#include <osmocom/sgsn/debug.h>
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#include <osmocom/sgsn/sgsn.h>
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static int sgsn_bssgp_fwd_rim_to_geran(const struct bssgp_ran_information_pdu *pdu)
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{
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struct bssgp_bvc_ctx *bvc_ctx;
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OSMO_ASSERT(pdu->routing_info_dest.discr == BSSGP_RIM_ROUTING_INFO_GERAN);
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/* Resolve RIM ROUTING ADDRESS to a BVC context */
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bvc_ctx = btsctx_by_raid_cid(&pdu->routing_info_dest.geran.raid, pdu->routing_info_dest.geran.cid);
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if (!bvc_ctx) {
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LOGP(DRIM, LOGL_ERROR, "Unable to find NSEI for destination cell %s\n",
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bssgp_rim_ri_name(&pdu->routing_info_dest));
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return -EINVAL;
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}
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/* Forward PDU to the NSEI of the resolved BVC context */
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return bssgp_tx_rim(pdu, bvc_ctx->nsei);
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}
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static int sgsn_bssgp_fwd_rim_to_geran_encoded(struct msgb *msg, struct bssgp_rim_routing_info *rim_routing_address)
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{
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struct bssgp_bvc_ctx *bvc_ctx;
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OSMO_ASSERT(rim_routing_address->discr == BSSGP_RIM_ROUTING_INFO_GERAN);
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/* Resolve RIM ROUTING ADDRESS to a BVC context */
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bvc_ctx = btsctx_by_raid_cid(&rim_routing_address->geran.raid, rim_routing_address->geran.cid);
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if (!bvc_ctx) {
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LOGP(DRIM, LOGL_ERROR, "Unable to find NSEI for destination cell %s\n",
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bssgp_rim_ri_name(rim_routing_address));
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return -EINVAL;
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}
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/* Forward PDU to the NSEI of the resolved BVC context */
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return bssgp_tx_rim_encoded(msg, bvc_ctx->nsei);
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}
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static int sgsn_bssgp_fwd_rim_to_eutran(const struct bssgp_ran_information_pdu *pdu)
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{
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struct sgsn_mme_ctx *mme;
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OSMO_ASSERT(pdu->routing_info_dest.discr == BSSGP_RIM_ROUTING_INFO_EUTRAN);
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mme = sgsn_mme_ctx_by_route(sgsn, &pdu->routing_info_dest.eutran.tai);
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if (!mme) { /* See if we have a default route configured */
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mme = sgsn_mme_ctx_by_default_route(sgsn);
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if (!mme) {
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LOGP(DRIM, LOGL_ERROR, "Unable to find MME for destination cell %s\n",
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bssgp_rim_ri_name(&pdu->routing_info_dest));
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return -EINVAL;
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}
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}
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return sgsn_mme_ran_info_req(mme, pdu);
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}
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/* Receive a RIM PDU from BSSGP (GERAN) */
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int sgsn_rim_rx_from_gb(struct osmo_bssgp_prim *bp, struct msgb *msg)
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{
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uint16_t nsei = msgb_nsei(msg);
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struct bssgp_ran_information_pdu *pdu = &bp->u.rim_pdu;
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if (pdu->routing_info_src.discr != BSSGP_RIM_ROUTING_INFO_GERAN) {
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LOGP(DRIM, LOGL_ERROR,
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"Rx BSSGP RIM (NSEI=%u): Expected src %s, got %s\n", nsei,
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bssgp_rim_routing_info_discr_str(BSSGP_RIM_ROUTING_INFO_GERAN),
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bssgp_rim_routing_info_discr_str(pdu->routing_info_src.discr));
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goto err;
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}
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switch (pdu->routing_info_dest.discr) {
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case BSSGP_RIM_ROUTING_INFO_GERAN:
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return sgsn_bssgp_fwd_rim_to_geran(pdu);
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case BSSGP_RIM_ROUTING_INFO_EUTRAN:
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return sgsn_bssgp_fwd_rim_to_eutran(pdu);
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default:
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/* At the moment we can only handle GERAN/EUTRAN addresses, any
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* other type of address will be considered as an invalid
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* address. see also: 3GPP TS 48.018, section 8c.3.1.3
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*/
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LOGP(DRIM, LOGL_ERROR,
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"Rx BSSGP RIM (NSEI=%u): Unsupported dst %s\n", nsei,
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bssgp_rim_routing_info_discr_str(pdu->routing_info_dest.discr));
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}
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LOGP(DRIM, LOGL_INFO, "Rx BSSGP RIM (NSEI=%u): for dest cell %s\n", nsei,
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bssgp_rim_ri_name(&pdu->routing_info_dest));
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err:
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/* In case of an invalid destination address we respond with
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* a BSSGP STATUS PDU, see also: 3GPP TS 48.018, section 8c.3.1.3 */
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bssgp_tx_status(BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg);
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return -1;
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}
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/* Receive a RIM PDU from GTPv1C (EUTRAN) */
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int sgsn_rim_rx_from_gtp(struct msgb *msg, struct bssgp_rim_routing_info *rim_routing_address)
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{
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/* TODO: In this code path, we currently only support RIM message forwarding to GERAN (BSSGP). However, it
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* technically also be possible to route a message back to GTP (BSSGP_RIM_ROUTING_INFO_EUTRAN) or to
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* IuPS (BSSGP_RIM_ROUTING_INFO_UTRAN) */
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if (rim_routing_address->discr != BSSGP_RIM_ROUTING_INFO_GERAN) {
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LOGP(DRIM, LOGL_ERROR, "Rx GTP RAN Information Relay: Expected dst %s, got %s\n",
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bssgp_rim_routing_info_discr_str(BSSGP_RIM_ROUTING_INFO_GERAN),
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bssgp_rim_routing_info_discr_str(rim_routing_address->discr));
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return -EINVAL;
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}
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LOGP(DRIM, LOGL_INFO, "Rx GTP RAN Information Relay for dest cell %s\n",
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bssgp_rim_ri_name(rim_routing_address));
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return sgsn_bssgp_fwd_rim_to_geran_encoded(msg, rim_routing_address);
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}
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