Harald Welte | 75bb820 | 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> |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 29 | #include <openbsc/debug.h> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 30 | #include <openbsc/gprs_sgsn.h> |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 31 | #include <openbsc/gprs_ns.h> |
| 32 | #include <openbsc/gprs_bssgp.h> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 33 | |
| 34 | static LLIST_HEAD(sgsn_mm_ctxts); |
| 35 | |
| 36 | static int ra_id_equals(const struct gprs_ra_id *id1, |
| 37 | const struct gprs_ra_id *id2) |
| 38 | { |
| 39 | return (id1->mcc == id2->mcc && id1->mnc == id2->mnc && |
| 40 | id1->lac == id2->lac && id1->rac == id2->rac); |
| 41 | } |
| 42 | |
| 43 | /* look-up a SGSN MM context based on TLLI + RAI */ |
| 44 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_tlli(u_int32_t tlli, |
| 45 | const struct gprs_ra_id *raid) |
| 46 | { |
| 47 | struct sgsn_mm_ctx *ctx; |
| 48 | |
| 49 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 50 | if (tlli == ctx->tlli && |
| 51 | ra_id_equals(raid, &ctx->ra)) |
| 52 | return ctx; |
| 53 | } |
| 54 | return NULL; |
| 55 | } |
| 56 | |
| 57 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_ptmsi(u_int32_t p_tmsi) |
| 58 | { |
| 59 | struct sgsn_mm_ctx *ctx; |
| 60 | |
| 61 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 62 | if (p_tmsi == ctx->p_tmsi) |
| 63 | return ctx; |
| 64 | } |
| 65 | return NULL; |
| 66 | } |
| 67 | |
| 68 | struct sgsn_mm_ctx *sgsn_mm_ctx_by_imsi(const char *imsi) |
| 69 | { |
| 70 | struct sgsn_mm_ctx *ctx; |
| 71 | |
| 72 | llist_for_each_entry(ctx, &sgsn_mm_ctxts, list) { |
| 73 | if (!strcmp(imsi, ctx->imsi)) |
| 74 | return ctx; |
| 75 | } |
| 76 | return NULL; |
| 77 | |
| 78 | } |
| 79 | |
| 80 | /* Allocate a new SGSN MM context */ |
| 81 | struct sgsn_mm_ctx *sgsn_mm_ctx_alloc(u_int32_t tlli, |
| 82 | const struct gprs_ra_id *raid) |
| 83 | { |
| 84 | struct sgsn_mm_ctx *ctx = talloc_zero(NULL, struct sgsn_mm_ctx); |
| 85 | |
| 86 | if (!ctx) |
| 87 | return NULL; |
| 88 | |
| 89 | memcpy(&ctx->ra, raid, sizeof(ctx->ra)); |
| 90 | ctx->tlli = tlli; |
| 91 | ctx->mm_state = GMM_DEREGISTERED; |
| 92 | |
| 93 | llist_add(&ctx->list, &sgsn_mm_ctxts); |
| 94 | |
| 95 | return ctx; |
| 96 | } |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 97 | |
| 98 | /* call-back function for the NS protocol */ |
| 99 | static int gprs_ns_cb(enum gprs_ns_evt event, struct gprs_nsvc *nsvc, |
| 100 | struct msgb *msg, u_int16_t bvci) |
| 101 | { |
| 102 | int rc = 0; |
| 103 | |
| 104 | switch (event) { |
| 105 | case GPRS_NS_EVT_UNIT_DATA: |
| 106 | /* hand the message into the BSSGP implementation */ |
| 107 | rc = gprs_bssgp_rcvmsg(msg, bvci); |
| 108 | break; |
| 109 | default: |
| 110 | LOGP(DGPRS, LOGL_ERROR, "SGSN: Unknown event %u from NS\n", event); |
| 111 | if (msg) |
| 112 | talloc_free(msg); |
| 113 | rc = -EIO; |
| 114 | break; |
| 115 | } |
| 116 | return rc; |
| 117 | } |
| 118 | |
| 119 | int sgsn_init(void) |
| 120 | { |
| 121 | struct gprs_ns_inst *nsi; |
| 122 | |
| 123 | nsi = gprs_ns_instantiate(&gprs_ns_cb); |
| 124 | if (!nsi) |
| 125 | return -EIO; |
| 126 | |
| 127 | return nsip_listen(nsi, 23000); |
| 128 | } |