Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 1 | /* GPRS SGSN integration with libgtp of OpenGGSN */ |
| 2 | |
| 3 | /* (C) 2010 by Harald Welte <laforge@gnumonks.org> |
| 4 | * (C) 2010 by On Waves |
| 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 <unistd.h> |
| 24 | #include <stdio.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <getopt.h> |
| 28 | #include <errno.h> |
| 29 | #include <signal.h> |
| 30 | #include <sys/fcntl.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <netinet/in.h> |
| 35 | #include <arpa/inet.h> |
| 36 | |
| 37 | #include <osmocore/talloc.h> |
| 38 | #include <osmocore/select.h> |
| 39 | #include <osmocore/rate_ctr.h> |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 40 | #include <openbsc/gsm_04_08_gprs.h> |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 41 | |
| 42 | #include <openbsc/signal.h> |
| 43 | #include <openbsc/debug.h> |
| 44 | #include <openbsc/sgsn.h> |
Harald Welte | ebabdea | 2010-06-01 18:28:10 +0200 | [diff] [blame] | 45 | #include <openbsc/gprs_llc.h> |
| 46 | #include <openbsc/gprs_bssgp.h> |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 47 | #include <openbsc/gprs_sgsn.h> |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 48 | #include <openbsc/gprs_gmm.h> |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 49 | |
| 50 | #include <gtp.h> |
| 51 | #include <pdp.h> |
| 52 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 53 | const struct value_string gtp_cause_strs[] = { |
| 54 | { GTPCAUSE_REQ_IMSI, "Request IMSI" }, |
| 55 | { GTPCAUSE_REQ_IMEI, "Request IMEI" }, |
| 56 | { GTPCAUSE_REQ_IMSI_IMEI, "Request IMSI and IMEI" }, |
| 57 | { GTPCAUSE_NO_ID_NEEDED, "No identity needed" }, |
| 58 | { GTPCAUSE_MS_REFUSES_X, "MS refuses" }, |
| 59 | { GTPCAUSE_MS_NOT_RESP_X, "MS is not GPRS responding" }, |
| 60 | { GTPCAUSE_ACC_REQ, "Request accepted" }, |
| 61 | { GTPCAUSE_NON_EXIST, "Non-existent" }, |
| 62 | { GTPCAUSE_INVALID_MESSAGE, "Invalid message format" }, |
| 63 | { GTPCAUSE_IMSI_NOT_KNOWN, "IMSI not known" }, |
| 64 | { GTPCAUSE_MS_DETACHED, "MS is GPRS detached" }, |
| 65 | { GTPCAUSE_MS_NOT_RESP, "MS is not GPRS responding" }, |
| 66 | { GTPCAUSE_MS_REFUSES, "MS refuses" }, |
| 67 | { GTPCAUSE_NO_RESOURCES, "No resources available" }, |
| 68 | { GTPCAUSE_NOT_SUPPORTED, "Service not supported" }, |
| 69 | { GTPCAUSE_MAN_IE_INCORRECT, "Mandatory IE incorrect" }, |
| 70 | { GTPCAUSE_MAN_IE_MISSING, "Mandatory IE missing" }, |
| 71 | { GTPCAUSE_OPT_IE_INCORRECT, "Optional IE incorrect" }, |
| 72 | { GTPCAUSE_SYS_FAIL, "System failure" }, |
| 73 | { GTPCAUSE_ROAMING_REST, "Roaming restrictions" }, |
| 74 | { GTPCAUSE_PTIMSI_MISMATCH, "P-TMSI Signature mismatch" }, |
| 75 | { GTPCAUSE_CONN_SUSP, "GPRS connection suspended" }, |
| 76 | { GTPCAUSE_AUTH_FAIL, "Authentication failure" }, |
| 77 | { GTPCAUSE_USER_AUTH_FAIL, "User authentication failed" }, |
| 78 | { GTPCAUSE_CONTEXT_NOT_FOUND, "Context not found" }, |
| 79 | { GTPCAUSE_ADDR_OCCUPIED, "All dynamic PDP addresses occupied" }, |
| 80 | { GTPCAUSE_NO_MEMORY, "No memory is available" }, |
| 81 | { GTPCAUSE_RELOC_FAIL, "Relocation failure" }, |
| 82 | { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, "Unknown mandatory ext. header" }, |
| 83 | { GTPCAUSE_SEM_ERR_TFT, "Semantic error in TFT operation" }, |
| 84 | { GTPCAUSE_SYN_ERR_TFT, "Syntactic error in TFT operation" }, |
| 85 | { GTPCAUSE_SEM_ERR_FILTER, "Semantic errors in packet filter" }, |
| 86 | { GTPCAUSE_SYN_ERR_FILTER, "Syntactic errors in packet filter" }, |
| 87 | { GTPCAUSE_MISSING_APN, "Missing or unknown APN" }, |
| 88 | { GTPCAUSE_UNKNOWN_PDP, "Unknown PDP address or PDP type" }, |
| 89 | { 0, NULL } |
| 90 | }; |
| 91 | |
| 92 | /* generate a PDP context based on the IE's from the 04.08 message, |
| 93 | * and send the GTP create pdp context request to the GGSN */ |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 94 | struct sgsn_pdp_ctx *sgsn_create_pdp_ctx(struct sgsn_ggsn_ctx *ggsn, |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 95 | struct sgsn_mm_ctx *mmctx, |
| 96 | uint16_t nsapi, |
| 97 | struct tlv_parsed *tp) |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 98 | { |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 99 | struct sgsn_pdp_ctx *pctx; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 100 | struct pdp_t *pdp; |
Harald Welte | cd4dd4d | 2010-05-18 17:20:49 +0200 | [diff] [blame] | 101 | uint64_t imsi_ui64 = 0; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 102 | int rc; |
| 103 | |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 104 | LOGP(DGPRS, LOGL_ERROR, "Create PDP Context\n"); |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 105 | pctx = sgsn_pdp_ctx_alloc(mmctx, nsapi); |
| 106 | if (!pctx) { |
| 107 | LOGP(DGPRS, LOGL_ERROR, "Couldn't allocate PDP Ctx\n"); |
| 108 | return NULL; |
| 109 | } |
| 110 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 111 | rc = pdp_newpdp(&pdp, imsi_ui64, nsapi, NULL); |
| 112 | if (rc) { |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 113 | LOGP(DGPRS, LOGL_ERROR, "Out of libgtp PDP Contexts\n"); |
| 114 | return NULL; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 115 | } |
Harald Welte | bb1c805 | 2010-06-03 06:38:38 +0200 | [diff] [blame] | 116 | pdp->priv = pctx; |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 117 | pctx->lib = pdp; |
| 118 | pctx->ggsn = ggsn; |
| 119 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 120 | //pdp->peer = /* sockaddr_in of GGSN (receive) */ |
| 121 | //pdp->ipif = /* not used by library */ |
| 122 | pdp->version = ggsn->gtp_version; |
| 123 | pdp->hisaddr0 = ggsn->remote_addr; |
| 124 | pdp->hisaddr1 = ggsn->remote_addr; |
| 125 | //pdp->cch_pdp = 512; /* Charging Flat Rate */ |
| 126 | |
| 127 | /* MS provided APN, subscription not verified */ |
| 128 | pdp->selmode = 0x01; |
| 129 | |
| 130 | /* IMSI, TEID/TEIC, FLLU/FLLC, TID, NSAPI set in pdp_newpdp */ |
| 131 | |
| 132 | /* FIXME: MSISDN in BCD format from mmctx */ |
| 133 | //pdp->msisdn.l/.v |
| 134 | |
| 135 | /* End User Address from GMM requested PDP address */ |
| 136 | pdp->eua.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_PDP_ADDR); |
| 137 | if (pdp->eua.l > sizeof(pdp->eua.v)) |
| 138 | pdp->eua.l = sizeof(pdp->eua.v); |
| 139 | memcpy(pdp->eua.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_PDP_ADDR), |
| 140 | pdp->eua.l); |
| 141 | /* Highest 4 bits of first byte need to be set to 1, otherwise |
| 142 | * the IE is identical with the 04.08 PDP Address IE */ |
| 143 | pdp->eua.v[0] |= 0xf0; |
| 144 | |
| 145 | /* APN name from GMM */ |
| 146 | pdp->apn_use.l = TLVP_LEN(tp, GSM48_IE_GSM_APN); |
| 147 | if (pdp->apn_use.l > sizeof(pdp->apn_use.v)) |
| 148 | pdp->apn_use.l = sizeof(pdp->apn_use.v); |
| 149 | memcpy(pdp->apn_use.v, TLVP_VAL(tp, GSM48_IE_GSM_APN), |
| 150 | pdp->apn_use.l); |
| 151 | |
| 152 | /* Protocol Configuration Options from GMM */ |
| 153 | pdp->pco_req.l = TLVP_LEN(tp, GSM48_IE_GSM_PROTO_CONF_OPT); |
| 154 | if (pdp->pco_req.l > sizeof(pdp->pco_req.v)) |
| 155 | pdp->pco_req.l = sizeof(pdp->pco_req.v); |
| 156 | memcpy(pdp->pco_req.v, TLVP_VAL(tp, GSM48_IE_GSM_PROTO_CONF_OPT), |
| 157 | pdp->pco_req.l); |
| 158 | |
| 159 | /* QoS options from GMM */ |
| 160 | pdp->qos_req.l = TLVP_LEN(tp, OSMO_IE_GSM_REQ_QOS); |
| 161 | if (pdp->qos_req.l > sizeof(pdp->qos_req.v)) |
| 162 | pdp->qos_req.l = sizeof(pdp->qos_req.v); |
| 163 | memcpy(pdp->qos_req.v, TLVP_VAL(tp, OSMO_IE_GSM_REQ_QOS), |
| 164 | pdp->qos_req.l); |
| 165 | |
| 166 | /* SGSN address for control plane */ |
Harald Welte | 61ca7ce | 2010-06-02 23:17:33 +0200 | [diff] [blame] | 167 | pdp->gsnlc.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); |
| 168 | memcpy(pdp->gsnlc.v, &sgsn->cfg.gtp_listenaddr.sin_addr, |
| 169 | sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 170 | |
| 171 | /* SGSN address for user plane */ |
Harald Welte | 61ca7ce | 2010-06-02 23:17:33 +0200 | [diff] [blame] | 172 | pdp->gsnlu.l = sizeof(sgsn->cfg.gtp_listenaddr.sin_addr); |
| 173 | memcpy(pdp->gsnlu.v, &sgsn->cfg.gtp_listenaddr.sin_addr, |
| 174 | sizeof(sgsn->cfg.gtp_listenaddr.sin_addr)); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 175 | |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 176 | /* change pdp state to 'requested' */ |
| 177 | pctx->state = PDP_STATE_CR_REQ; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 178 | |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 179 | rc = gtp_create_context_req(ggsn->gsn, pdp, pctx); |
| 180 | /* FIXME */ |
| 181 | |
| 182 | return pctx; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 183 | } |
| 184 | |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 185 | int sgsn_delete_pdp_ctx(struct sgsn_pdp_ctx *pctx) |
| 186 | { |
| 187 | LOGP(DGPRS, LOGL_ERROR, "Delete PDP Context\n"); |
| 188 | |
| 189 | /* FIXME: decide if we need teardown or not ! */ |
| 190 | return gtp_delete_context_req(pctx->ggsn->gsn, pctx->lib, pctx, 1); |
| 191 | } |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 192 | |
| 193 | struct cause_map { |
| 194 | uint8_t cause_in; |
| 195 | uint8_t cause_out; |
| 196 | }; |
| 197 | |
| 198 | static uint8_t cause_map(const struct cause_map *map, uint8_t in, uint8_t deflt) |
| 199 | { |
| 200 | const struct cause_map *m; |
| 201 | |
| 202 | for (m = map; m->cause_in && m->cause_out; m++) { |
| 203 | if (m->cause_in == in) |
| 204 | return m->cause_out; |
| 205 | } |
| 206 | return deflt; |
| 207 | } |
| 208 | |
| 209 | /* how do we map from gtp cause to SM cause */ |
| 210 | static const struct cause_map gtp2sm_cause_map[] = { |
| 211 | { GTPCAUSE_NO_RESOURCES, GSM_CAUSE_INSUFF_RSRC }, |
| 212 | { GTPCAUSE_NOT_SUPPORTED, GSM_CAUSE_SERV_OPT_NOTSUPP }, |
| 213 | { GTPCAUSE_MAN_IE_INCORRECT, GSM_CAUSE_INV_MAND_INFO }, |
| 214 | { GTPCAUSE_MAN_IE_MISSING, GSM_CAUSE_INV_MAND_INFO }, |
| 215 | { GTPCAUSE_OPT_IE_INCORRECT, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 216 | { GTPCAUSE_SYS_FAIL, GSM_CAUSE_NET_FAIL }, |
| 217 | { GTPCAUSE_ROAMING_REST, GSM_CAUSE_REQ_SERV_OPT_NOTSUB }, |
| 218 | { GTPCAUSE_PTIMSI_MISMATCH, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 219 | { GTPCAUSE_CONN_SUSP, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 220 | { GTPCAUSE_AUTH_FAIL, GSM_CAUSE_AUTH_FAILED }, |
| 221 | { GTPCAUSE_USER_AUTH_FAIL, GSM_CAUSE_ACT_REJ_GGSN }, |
| 222 | { GTPCAUSE_CONTEXT_NOT_FOUND, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 223 | { GTPCAUSE_ADDR_OCCUPIED, GSM_CAUSE_INSUFF_RSRC }, |
| 224 | { GTPCAUSE_NO_MEMORY, GSM_CAUSE_INSUFF_RSRC }, |
| 225 | { GTPCAUSE_RELOC_FAIL, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 226 | { GTPCAUSE_UNKNOWN_MAN_EXTHEADER, GSM_CAUSE_PROTO_ERR_UNSPEC }, |
| 227 | { GTPCAUSE_MISSING_APN, GSM_CAUSE_MISSING_APN }, |
| 228 | { GTPCAUSE_UNKNOWN_PDP, GSM_CAUSE_UNKNOWN_PDP }, |
| 229 | { 0, 0 } |
| 230 | }; |
| 231 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 232 | /* The GGSN has confirmed the creation of a PDP Context */ |
| 233 | static int create_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) |
| 234 | { |
Harald Welte | d193cb3 | 2010-05-17 22:58:03 +0200 | [diff] [blame] | 235 | struct sgsn_pdp_ctx *pctx = cbp; |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 236 | uint8_t reject_cause; |
Harald Welte | f11b6d2 | 2010-06-02 10:09:50 +0200 | [diff] [blame] | 237 | int rc; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 238 | |
| 239 | DEBUGP(DGPRS, "Received CREATE PDP CTX CONF, cause=%d(%s)\n", |
| 240 | cause, get_value_string(gtp_cause_strs, cause)); |
| 241 | |
| 242 | /* Check for cause value if it was really successful */ |
| 243 | if (cause < 0) { |
| 244 | LOGP(DGPRS, LOGL_NOTICE, "Create PDP ctx req timed out\n"); |
Harald Welte | 1371f7d | 2010-06-01 11:52:41 +0200 | [diff] [blame] | 245 | if (pdp && pdp->version == 1) { |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 246 | pdp->version = 0; |
Harald Welte | 8fc1a46 | 2010-05-17 00:53:10 +0200 | [diff] [blame] | 247 | gtp_create_context_req(sgsn->gsn, pdp, cbp); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 248 | return 0; |
| 249 | } else { |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 250 | reject_cause = GSM_CAUSE_NET_FAIL; |
| 251 | goto reject; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 252 | } |
| 253 | } |
| 254 | |
| 255 | /* Check for cause value if it was really successful */ |
| 256 | if (cause != GTPCAUSE_ACC_REQ) { |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 257 | reject_cause = cause_map(gtp2sm_cause_map, cause, |
| 258 | GSM_CAUSE_ACT_REJ_GGSN); |
| 259 | goto reject; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 260 | } |
| 261 | |
Harald Welte | ebabdea | 2010-06-01 18:28:10 +0200 | [diff] [blame] | 262 | /* Activate the SNDCP layer */ |
| 263 | sndcp_sm_activate_ind(&pctx->mm->llme->lle[pctx->sapi], pctx->nsapi); |
| 264 | |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 265 | /* Send PDP CTX ACT to MS */ |
| 266 | return gsm48_tx_gsm_act_pdp_acc(pctx); |
| 267 | |
| 268 | reject: |
| 269 | pctx->state = PDP_STATE_NONE; |
Harald Welte | 1371f7d | 2010-06-01 11:52:41 +0200 | [diff] [blame] | 270 | if (pdp) |
| 271 | pdp_freepdp(pdp); |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 272 | /* Send PDP CTX ACT REJ to MS */ |
Harald Welte | f11b6d2 | 2010-06-02 10:09:50 +0200 | [diff] [blame] | 273 | rc = gsm48_tx_gsm_act_pdp_rej(pctx->mm, pctx->ti, reject_cause, |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 274 | 0, NULL); |
Harald Welte | f11b6d2 | 2010-06-02 10:09:50 +0200 | [diff] [blame] | 275 | sgsn_pdp_ctx_free(pctx); |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 276 | |
| 277 | return EOF; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 278 | } |
| 279 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 280 | /* Confirmation of a PDP Context Delete */ |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 281 | static int delete_pdp_conf(struct pdp_t *pdp, void *cbp, int cause) |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 282 | { |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 283 | struct sgsn_pdp_ctx *pctx = cbp; |
| 284 | int rc; |
| 285 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 286 | DEBUGP(DGPRS, "Received DELETE PDP CTX CONF, cause=%d(%s)\n", |
| 287 | cause, get_value_string(gtp_cause_strs, cause)); |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 288 | |
| 289 | /* Confirm deactivation of PDP context to MS */ |
| 290 | rc = gsm48_tx_gsm_deact_pdp_acc(pctx); |
| 291 | |
| 292 | sgsn_pdp_ctx_free(pctx); |
| 293 | |
| 294 | return rc; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 295 | } |
| 296 | |
| 297 | /* Confirmation of an GTP ECHO request */ |
| 298 | static int echo_conf(int recovery) |
| 299 | { |
| 300 | if (recovery < 0) { |
| 301 | DEBUGP(DGPRS, "GTP Echo Request timed out\n"); |
| 302 | /* FIXME: if version == 1, retry with version 0 */ |
| 303 | } else { |
| 304 | DEBUGP(DGPRS, "GTP Rx Echo Response\n"); |
| 305 | } |
| 306 | return 0; |
| 307 | } |
| 308 | |
| 309 | /* libgtp callback for confirmations */ |
| 310 | static int cb_conf(int type, int cause, struct pdp_t *pdp, void *cbp) |
| 311 | { |
| 312 | DEBUGP(DGPRS, "libgtp cb_conf(type=%d, cause=%d, pdp=%p, cbp=%p)\n", |
| 313 | type, cause, pdp, cbp); |
| 314 | |
| 315 | if (cause == EOF) |
| 316 | LOGP(DGPRS, LOGL_ERROR, "libgtp EOF (type=%u, pdp=%p, cbp=%p)\n", |
| 317 | type, pdp, cbp); |
| 318 | |
| 319 | switch (type) { |
| 320 | case GTP_ECHO_REQ: |
| 321 | return echo_conf(cause); |
| 322 | case GTP_CREATE_PDP_REQ: |
| 323 | return create_pdp_conf(pdp, cbp, cause); |
| 324 | case GTP_DELETE_PDP_REQ: |
Harald Welte | 77289c2 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 325 | return delete_pdp_conf(pdp, cbp, cause); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 326 | default: |
| 327 | break; |
| 328 | } |
| 329 | return 0; |
| 330 | } |
| 331 | |
| 332 | /* Called whenever a PDP context is deleted for any reason */ |
| 333 | static int cb_delete_context(struct pdp_t *pdp) |
| 334 | { |
| 335 | LOGP(DGPRS, LOGL_INFO, "PDP Context was deleted\n"); |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | /* Called when we receive a Version Not Supported message */ |
| 340 | static int cb_unsup_ind(struct sockaddr_in *peer) |
| 341 | { |
| 342 | LOGP(DGPRS, LOGL_INFO, "GTP Version not supported Indication " |
| 343 | "from %s:%u\n", inet_ntoa(peer->sin_addr), |
| 344 | ntohs(peer->sin_port)); |
| 345 | return 0; |
| 346 | } |
| 347 | |
| 348 | /* Called when we receive a Supported Ext Headers Notification */ |
| 349 | static int cb_extheader_ind(struct sockaddr_in *peer) |
| 350 | { |
| 351 | LOGP(DGPRS, LOGL_INFO, "GTP Supported Ext Headers Noficiation " |
| 352 | "from %s:%u\n", inet_ntoa(peer->sin_addr), |
| 353 | ntohs(peer->sin_port)); |
| 354 | return 0; |
| 355 | } |
| 356 | |
| 357 | /* Called whenever we recive a DATA packet */ |
Harald Welte | bb1c805 | 2010-06-03 06:38:38 +0200 | [diff] [blame] | 358 | static int cb_data_ind(struct pdp_t *lib, void *packet, unsigned int len) |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 359 | { |
Harald Welte | bb1c805 | 2010-06-03 06:38:38 +0200 | [diff] [blame] | 360 | struct sgsn_pdp_ctx *pdp; |
| 361 | struct msgb *msg = msgb_alloc_headroom(len+128, 128, "GTP->SNDCP"); |
| 362 | uint8_t *ud; |
| 363 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 364 | DEBUGP(DGPRS, "GTP DATA IND from GGSN, length=%u\n", len); |
Harald Welte | 6abf94e | 2010-05-18 10:35:06 +0200 | [diff] [blame] | 365 | /* FIXME: resolve PDP/MM context, forward to SNDCP layer */ |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 366 | |
Harald Welte | bb1c805 | 2010-06-03 06:38:38 +0200 | [diff] [blame] | 367 | pdp = lib->priv; |
| 368 | if (!pdp) { |
| 369 | DEBUGP(DGPRS, "GTP DATA IND from GGSN for unknown PDP\n"); |
| 370 | return -EIO; |
| 371 | } |
| 372 | |
| 373 | ud = msgb_put(msg, len); |
| 374 | memcpy(ud, packet, len); |
| 375 | |
| 376 | msgb_tlli(msg) = pdp->mm->tlli; |
| 377 | msgb_bvci(msg) = pdp->mm->bvci; |
| 378 | msgb_nsei(msg) = pdp->mm->nsei; |
| 379 | |
| 380 | return sndcp_unitdata_req(msg, &pdp->mm->llme->lle[pdp->sapi], pdp->nsapi, pdp->mm); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 381 | } |
| 382 | |
Harald Welte | ebabdea | 2010-06-01 18:28:10 +0200 | [diff] [blame] | 383 | /* Called by SNDCP when it has received/re-assembled a N-PDU */ |
| 384 | int sgsn_rx_sndcp_ud_ind(uint32_t tlli, uint8_t nsapi, struct msgb *msg, |
| 385 | uint32_t npdu_len, uint8_t *npdu) |
| 386 | { |
| 387 | struct sgsn_mm_ctx *mmctx; |
| 388 | struct sgsn_pdp_ctx *pdp; |
| 389 | struct gprs_ra_id ra_id; |
| 390 | |
| 391 | /* look-up the MM context for this message */ |
| 392 | bssgp_parse_cell_id(&ra_id, msgb_bcid(msg)); |
| 393 | mmctx = sgsn_mm_ctx_by_tlli(tlli, &ra_id); |
| 394 | if (!mmctx) { |
| 395 | LOGP(DGPRS, LOGL_ERROR, |
| 396 | "Cannot find MM CTX for TLLI %08x\n", tlli); |
| 397 | return -EIO; |
| 398 | } |
| 399 | /* look-up the PDP context for this message */ |
| 400 | pdp = sgsn_pdp_ctx_by_nsapi(mmctx, nsapi); |
| 401 | if (!pdp) { |
| 402 | LOGP(DGPRS, LOGL_ERROR, "Cannot find PDP CTX for " |
| 403 | "TLLI=%08x, NSAPI=%u\n", tlli, nsapi); |
| 404 | return -EIO; |
| 405 | } |
| 406 | if (!pdp->lib) { |
| 407 | LOGP(DGPRS, LOGL_ERROR, "PDP CTX without libgtp\n"); |
| 408 | return -EIO; |
| 409 | } |
| 410 | return gtp_data_req(pdp->ggsn->gsn, pdp->lib, npdu, npdu_len); |
| 411 | } |
| 412 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 413 | /* libgtp select loop integration */ |
| 414 | static int sgsn_gtp_fd_cb(struct bsc_fd *fd, unsigned int what) |
| 415 | { |
| 416 | struct sgsn_instance *sgi = fd->data; |
| 417 | int rc; |
| 418 | |
| 419 | if (!(what & BSC_FD_READ)) |
| 420 | return 0; |
| 421 | |
| 422 | switch (fd->priv_nr) { |
| 423 | case 0: |
| 424 | rc = gtp_decaps0(sgi->gsn); |
| 425 | break; |
| 426 | case 1: |
| 427 | rc = gtp_decaps1c(sgi->gsn); |
| 428 | break; |
| 429 | case 2: |
| 430 | rc = gtp_decaps1u(sgi->gsn); |
| 431 | break; |
Harald Welte | cd4dd4d | 2010-05-18 17:20:49 +0200 | [diff] [blame] | 432 | default: |
| 433 | rc = -EINVAL; |
| 434 | break; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 435 | } |
| 436 | return rc; |
| 437 | } |
| 438 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 439 | static void sgsn_gtp_tmr_start(struct sgsn_instance *sgi) |
| 440 | { |
Harald Welte | b4a3129 | 2010-05-18 18:24:53 +0200 | [diff] [blame] | 441 | struct timeval next; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 442 | |
| 443 | /* Retrieve next retransmission as struct timeval */ |
| 444 | gtp_retranstimeout(sgi->gsn, &next); |
| 445 | |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 446 | /* re-schedule the timer */ |
Harald Welte | b4a3129 | 2010-05-18 18:24:53 +0200 | [diff] [blame] | 447 | bsc_schedule_timer(&sgi->gtp_timer, next.tv_sec, next.tv_usec/1000); |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 448 | } |
| 449 | |
| 450 | /* timer callback for libgtp retransmissions and ping */ |
| 451 | static void sgsn_gtp_tmr_cb(void *data) |
| 452 | { |
| 453 | struct sgsn_instance *sgi = data; |
| 454 | |
| 455 | /* Do all the retransmissions as needed */ |
| 456 | gtp_retrans(sgi->gsn); |
| 457 | |
| 458 | sgsn_gtp_tmr_start(sgi); |
| 459 | } |
| 460 | |
| 461 | int sgsn_gtp_init(struct sgsn_instance *sgi) |
| 462 | { |
| 463 | int rc; |
| 464 | struct gsn_t *gsn; |
| 465 | |
| 466 | rc = gtp_new(&sgi->gsn, sgi->cfg.gtp_statedir, |
| 467 | &sgi->cfg.gtp_listenaddr.sin_addr, GTP_MODE_SGSN); |
| 468 | if (rc) { |
| 469 | LOGP(DGPRS, LOGL_ERROR, "Failed to create GTP: %d\n", rc); |
| 470 | return rc; |
| 471 | } |
| 472 | gsn = sgi->gsn; |
| 473 | |
| 474 | sgi->gtp_fd0.fd = gsn->fd0; |
| 475 | sgi->gtp_fd0.priv_nr = 0; |
| 476 | sgi->gtp_fd0.data = sgi; |
Harald Welte | 322a5ee | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 477 | sgi->gtp_fd0.when = BSC_FD_READ; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 478 | sgi->gtp_fd0.cb = sgsn_gtp_fd_cb; |
| 479 | rc = bsc_register_fd(&sgi->gtp_fd0); |
| 480 | if (rc < 0) |
| 481 | return rc; |
| 482 | |
| 483 | sgi->gtp_fd1c.fd = gsn->fd1c; |
| 484 | sgi->gtp_fd1c.priv_nr = 1; |
| 485 | sgi->gtp_fd1c.data = sgi; |
Harald Welte | 322a5ee | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 486 | sgi->gtp_fd1c.when = BSC_FD_READ; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 487 | sgi->gtp_fd1c.cb = sgsn_gtp_fd_cb; |
| 488 | bsc_register_fd(&sgi->gtp_fd1c); |
| 489 | if (rc < 0) |
| 490 | return rc; |
| 491 | |
| 492 | sgi->gtp_fd1u.fd = gsn->fd1u; |
| 493 | sgi->gtp_fd1u.priv_nr = 2; |
| 494 | sgi->gtp_fd1u.data = sgi; |
Harald Welte | 322a5ee | 2010-05-18 13:13:11 +0200 | [diff] [blame] | 495 | sgi->gtp_fd1u.when = BSC_FD_READ; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 496 | sgi->gtp_fd1u.cb = sgsn_gtp_fd_cb; |
| 497 | bsc_register_fd(&sgi->gtp_fd1u); |
| 498 | if (rc < 0) |
| 499 | return rc; |
| 500 | |
| 501 | /* Start GTP re-transmission timer */ |
| 502 | sgi->gtp_timer.cb = sgsn_gtp_tmr_cb; |
Harald Welte | 51537ee | 2010-05-18 18:28:13 +0200 | [diff] [blame] | 503 | sgi->gtp_timer.data = sgi; |
Harald Welte | 2720e73 | 2010-05-17 00:44:57 +0200 | [diff] [blame] | 504 | sgsn_gtp_tmr_start(sgi); |
| 505 | |
| 506 | /* Register callbackcs with libgtp */ |
| 507 | gtp_set_cb_delete_context(gsn, cb_delete_context); |
| 508 | gtp_set_cb_conf(gsn, cb_conf); |
| 509 | gtp_set_cb_data_ind(gsn, cb_data_ind); |
| 510 | gtp_set_cb_unsup_ind(gsn, cb_unsup_ind); |
| 511 | gtp_set_cb_extheader_ind(gsn, cb_extheader_ind); |
| 512 | |
| 513 | return 0; |
| 514 | } |