| |
| #include <stdio.h> |
| |
| #include <errno.h> |
| #include <stdint.h> |
| |
| #include <osmocom/core/msgb.h> |
| #include <osmocom/gsm/tlv.h> |
| #include <osmocom/vty/logging.h> |
| #include <osmocom/gprs/gprs_ns.h> |
| #include <osmocom/gprs/gprs_bssgp.h> |
| #include <osmocom/gprs/gprs_bssgp_rim.h> |
| #include <osmocom/sgsn/sgsn_rim.h> |
| #include <osmocom/sgsn/debug.h> |
| |
| /* Find an NSEI for the destination cell, this function works only for GERAN! */ |
| static int find_dest_nsei_geran(struct bssgp_rim_routing_info *dest_rim_ri, uint16_t nsei) |
| { |
| struct bssgp_bvc_ctx *bvc_ctx; |
| |
| OSMO_ASSERT(dest_rim_ri->discr == BSSGP_RIM_ROUTING_INFO_GERAN); |
| |
| bvc_ctx = btsctx_by_raid_cid(&dest_rim_ri->geran.raid, dest_rim_ri->geran.cid); |
| if (!bvc_ctx) { |
| LOGP(DRIM, LOGL_ERROR, "BSSGP RIM (NSEI=%u) cannot find NSEI for destination cell\n", nsei); |
| return -EINVAL; |
| } |
| |
| return bvc_ctx->nsei; |
| } |
| |
| int sgsn_rim_rx(struct osmo_bssgp_prim *bp, struct msgb *msg) |
| { |
| struct bssgp_ran_information_pdu *pdu = &bp->u.rim_pdu; |
| int d_nsei; |
| uint16_t nsei = msgb_nsei(msg); |
| |
| /* At the moment we only support GERAN, so we block all other network |
| * types here. */ |
| if (pdu->routing_info_dest.discr != BSSGP_RIM_ROUTING_INFO_GERAN) { |
| LOGP(DRIM, LOGL_ERROR, |
| "BSSGP RIM (NSEI=%u) only GERAN supported, destination cell is not a GERAN cell -- rejected.\n", |
| nsei); |
| /* At the moment we can only handle GERAN addresses, any other |
| * type of address will be consideres as an invalid address. |
| * see also: 3GPP TS 48.018, section 8c.3.1.3 */ |
| return bssgp_tx_status(BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
| } |
| if (pdu->routing_info_src.discr != BSSGP_RIM_ROUTING_INFO_GERAN) { |
| LOGP(DRIM, LOGL_ERROR, |
| "BSSGP RIM (NSEI=%u) only GERAN supported, source cell is not a GERAN cell -- rejected.\n", nsei); |
| /* See comment above */ |
| return bssgp_tx_status(BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
| } |
| |
| d_nsei = find_dest_nsei_geran(&pdu->routing_info_dest, nsei); |
| if (d_nsei < 0) { |
| LOGP(DRIM, LOGL_NOTICE, "BSSGP RIM (NSEI=%u) Cell %s unknown to this sgsn\n", |
| nsei, bssgp_rim_ri_name(&pdu->routing_info_dest)); |
| /* In case of an invalid destination address we respond with |
| * a BSSGP STATUS PDU, see also: 3GPP TS 48.018, section 8c.3.1.3 */ |
| return bssgp_tx_status(BSSGP_CAUSE_UNKN_RIM_AI, NULL, msg); |
| } |
| |
| /* Forward PDU as it is to the correct interface */ |
| return bssgp_tx_rim(pdu, (uint16_t) d_nsei); |
| } |