Harald Welte | 9b455bf | 2010-03-14 15:45:01 +0800 | [diff] [blame^] | 1 | /* GPRS SGSN functionality */ |
| 2 | |
| 3 | /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
| 4 | * |
| 5 | * All Rights Reserved |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
| 22 | |
| 23 | #include <sys/types.h> |
| 24 | |
| 25 | #include <osmocore/linuxlist.h> |
| 26 | #include <osmocore/talloc.h> |
| 27 | #include <osmocore/timer.h> |
| 28 | #include <openbsc/gsm_subscriber.h> |
| 29 | #include <openbsc/gprs_sgsn.h> |
| 30 | |
| 31 | static LLIST_HEAD(sgsn_mm_ctxts); |
| 32 | |
| 33 | static int ra_id_equals(const struct gprs_ra_id *id1, |
| 34 | const struct gprs_ra_id *id2) |
| 35 | { |
| 36 | return (id1->mcc == id2->mcc && id1->mnc == id2->mnc && |
| 37 | id1->lac == id2->lac && id1->rac == id2->rac); |
| 38 | } |
| 39 | |
| 40 | /* look-up a SGSN MM context based on TLLI + RAI */ |
| 41 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli, |
| 42 | const struct gprs_ra_id *raid) |
| 43 | { |
| 44 | struct sgsn_mm_ctx *ctx; |
| 45 | |
| 46 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 47 | if (tlli == ctx->tlli && |
| 48 | ra_id_equals(raid, &ctx->ra)) |
| 49 | return ctx; |
| 50 | } |
| 51 | return NULL; |
| 52 | } |
| 53 | |
| 54 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t p_tmsi) |
| 55 | { |
| 56 | struct sgsn_mm_ctx *ctx; |
| 57 | |
| 58 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 59 | if (p_tmsi == ctx->p_tmsi) |
| 60 | return ctx; |
| 61 | } |
| 62 | return NULL; |
| 63 | } |
| 64 | |
| 65 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi) |
| 66 | { |
| 67 | struct sgsn_mm_ctx *ctx; |
| 68 | |
| 69 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 70 | if (!strcmp(imsi, ctx->imsi)) |
| 71 | return ctx; |
| 72 | } |
| 73 | return NULL; |
| 74 | |
| 75 | } |
| 76 | |
| 77 | /* Allocate a new SGSN MM context */ |
| 78 | struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli, |
| 79 | const struct gprs_ra_id *raid) |
| 80 | { |
| 81 | struct sgsn_mm_ctx *ctx = talloc_zero(NULL, struct sgsn_mm_ctx); |
| 82 | |
| 83 | if (!ctx) |
| 84 | return NULL; |
| 85 | |
| 86 | memcpy(&ctx->ra, raid, sizeof(ctx->ra)); |
| 87 | ctx->tlli = tlli; |
| 88 | ctx->mm_state = GMM_DEREGISTERED; |
| 89 | |
| 90 | llist_add(&ctx->list, &sgsn_mm_ctxts); |
| 91 | |
| 92 | return ctx; |
| 93 | } |