| /* GPRS SGSN functionality */ |
| |
| /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| * |
| * All Rights Reserved |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| */ |
| |
| #include <sys/types.h> |
| |
| #include <osmocore/linuxlist.h> |
| #include <osmocore/talloc.h> |
| #include <osmocore/timer.h> |
| #include <openbsc/gsm_subscriber.h> |
| #include <openbsc/debug.h> |
| #include <openbsc/gprs_sgsn.h> |
| #include <openbsc/gprs_ns.h> |
| #include <openbsc/gprs_bssgp.h> |
| |
| static LLIST_HEAD(sgsn_mm_ctxts); |
| |
| static int ra_id_equals(const struct gprs_ra_id *id1, |
| const struct gprs_ra_id *id2) |
| { |
| return (id1->mcc == id2->mcc && id1->mnc == id2->mnc && |
| id1->lac == id2->lac && id1->rac == id2->rac); |
| } |
| |
| /* look-up a SGSN MM context based on TLLI + RAI */ |
| struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli, |
| const struct gprs_ra_id *raid) |
| { |
| struct sgsn_mm_ctx *ctx; |
| |
| llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| if (tlli == ctx->tlli && |
| ra_id_equals(raid, &ctx->ra)) |
| return ctx; |
| } |
| return NULL; |
| } |
| |
| struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t p_tmsi) |
| { |
| struct sgsn_mm_ctx *ctx; |
| |
| llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| if (p_tmsi == ctx->p_tmsi) |
| return ctx; |
| } |
| return NULL; |
| } |
| |
| struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi) |
| { |
| struct sgsn_mm_ctx *ctx; |
| |
| llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| if (!strcmp(imsi, ctx->imsi)) |
| return ctx; |
| } |
| return NULL; |
| |
| } |
| |
| /* Allocate a new SGSN MM context */ |
| struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli, |
| const struct gprs_ra_id *raid) |
| { |
| struct sgsn_mm_ctx *ctx = talloc_zero(NULL, struct sgsn_mm_ctx); |
| |
| if (!ctx) |
| return NULL; |
| |
| memcpy(&ctx->ra, raid, sizeof(ctx->ra)); |
| ctx->tlli = tlli; |
| ctx->mm_state = GMM_DEREGISTERED; |
| |
| llist_add(&ctx->list, &sgsn_mm_ctxts); |
| |
| return ctx; |
| } |
| |
| /* call-back function for the NS protocol */ |
| static int gprs_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, |
| struct msgb *msg, u_int16_t bvci) |
| { |
| int rc = 0; |
| |
| switch (event) { |
| case GPRS_NS_EVT_UNIT_DATA: |
| /* hand the message into the BSSGP implementation */ |
| rc = gprs_bssgp_rcvmsg(msg, bvci); |
| break; |
| default: |
| LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event); |
| if (msg) |
| talloc_free(msg); |
| rc = -EIO; |
| break; |
| } |
| return rc; |
| } |
| |
| int sgsn_init(void) |
| { |
| struct gprs_ns_inst *nsi; |
| |
| nsi = gprs_ns_instantiate(&gprs_ns_cb); |
| if (!nsi) |
| return -EIO; |
| |
| return nsip_listen(nsi, 23000); |
| } |