Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 1 | /* GPRS Networks Service (NS) messages on the Gb interfacebvci = msgb_bvci(msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 2 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) */ |
| 3 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 4 | /* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 5 | * |
| 6 | * All Rights Reserved |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | /* Some introduction into NS: NS is used typically on top of frame relay, |
| 25 | * but in the ip.access world it is encapsulated in UDP packets. It serves |
| 26 | * as an intermediate shim betwen BSSGP and the underlying medium. It doesn't |
| 27 | * do much, apart from providing congestion notification and status indication. |
| 28 | * |
| 29 | * Terms: |
| 30 | * NS Network Service |
| 31 | * NSVC NS Virtual Connection |
| 32 | * NSEI NS Entity Identifier |
| 33 | * NSVL NS Virtual Link |
| 34 | * NSVLI NS Virtual Link Identifier |
| 35 | * BVC BSSGP Virtual Connection |
| 36 | * BVCI BSSGP Virtual Connection Identifier |
| 37 | * NSVCG NS Virtual Connection Goup |
| 38 | * Blocked NS-VC cannot be used for user traffic |
| 39 | * Alive Ability of a NS-VC to provide communication |
| 40 | * |
| 41 | * There can be multiple BSSGP virtual connections over one (group of) NSVC's. BSSGP will |
| 42 | * therefore identify the BSSGP virtual connection by a BVCI passed down to NS. |
| 43 | * NS then has to firgure out which NSVC's are responsible for this BVCI. |
| 44 | * Those mappings are administratively configured. |
| 45 | */ |
| 46 | |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 47 | /* This implementation has the following limitations: |
| 48 | * o Only one NS-VC for each NSE: No load-sharing function |
| 49 | * o NSVCI 65535 and 65534 are reserved for internal use |
| 50 | * o Only UDP is supported as of now, no frame relay support |
| 51 | * o The IP Sub-Network-Service (SNS) as specified in 48.016 is not implemented |
| 52 | * o There are no BLOCK and UNBLOCK timers (yet?) |
| 53 | */ |
| 54 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 55 | #include <stdlib.h> |
| 56 | #include <unistd.h> |
| 57 | #include <errno.h> |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 58 | #include <stdint.h> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 59 | |
| 60 | #include <arpa/inet.h> |
| 61 | |
| 62 | #include <openbsc/gsm_data.h> |
| 63 | #include <osmocore/msgb.h> |
| 64 | #include <osmocore/tlv.h> |
| 65 | #include <osmocore/talloc.h> |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 66 | #include <osmocore/select.h> |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 67 | #include <osmocore/rate_ctr.h> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 68 | #include <openbsc/debug.h> |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 69 | #include <openbsc/signal.h> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 70 | #include <openbsc/gprs_ns.h> |
| 71 | #include <openbsc/gprs_bssgp.h> |
| 72 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 73 | static const struct tlv_definition ns_att_tlvdef = { |
| 74 | .def = { |
| 75 | [NS_IE_CAUSE] = { TLV_TYPE_TvLV, 0 }, |
| 76 | [NS_IE_VCI] = { TLV_TYPE_TvLV, 0 }, |
| 77 | [NS_IE_PDU] = { TLV_TYPE_TvLV, 0 }, |
| 78 | [NS_IE_BVCI] = { TLV_TYPE_TvLV, 0 }, |
| 79 | [NS_IE_NSEI] = { TLV_TYPE_TvLV, 0 }, |
| 80 | }, |
| 81 | }; |
| 82 | |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 83 | enum ns_ctr { |
| 84 | NS_CTR_PKTS_IN, |
| 85 | NS_CTR_PKTS_OUT, |
| 86 | NS_CTR_BYTES_IN, |
| 87 | NS_CTR_BYTES_OUT, |
| 88 | NS_CTR_BLOCKED, |
| 89 | NS_CTR_DEAD, |
| 90 | }; |
| 91 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 92 | static const struct rate_ctr_desc nsvc_ctr_description[] = { |
| 93 | { "packets.in", "Packets at NS Level ( In)" }, |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 94 | { "packets.out","Packets at NS Level (Out)" }, |
| 95 | { "bytes.in", "Bytes at NS Level ( In)" }, |
| 96 | { "bytes.out", "Bytes at NS Level (Out)" }, |
| 97 | { "blocked", "NS-VC Block count " }, |
| 98 | { "dead", "NS-VC gone dead count " }, |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 99 | }; |
| 100 | |
| 101 | static const struct rate_ctr_group_desc nsvc_ctrg_desc = { |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 102 | .group_name_prefix = "ns.nsvc", |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 103 | .group_description = "NSVC Peer Statistics", |
| 104 | .num_ctr = ARRAY_SIZE(nsvc_ctr_description), |
| 105 | .ctr_desc = nsvc_ctr_description, |
| 106 | }; |
| 107 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 108 | /* Lookup struct gprs_nsvc based on NSVCI */ |
Harald Welte | 1882486 | 2010-05-15 23:02:24 +0200 | [diff] [blame] | 109 | struct gprs_nsvc *nsvc_by_nsvci(struct gprs_ns_inst *nsi, uint16_t nsvci) |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 110 | { |
| 111 | struct gprs_nsvc *nsvc; |
| 112 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 113 | if (nsvc->nsvci == nsvci) |
| 114 | return nsvc; |
| 115 | } |
| 116 | return NULL; |
| 117 | } |
| 118 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 119 | /* Lookup struct gprs_nsvc based on NSVCI */ |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 120 | struct gprs_nsvc *nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei) |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 121 | { |
| 122 | struct gprs_nsvc *nsvc; |
| 123 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
| 124 | if (nsvc->nsei == nsei) |
| 125 | return nsvc; |
| 126 | } |
| 127 | return NULL; |
| 128 | } |
| 129 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 130 | /* Lookup struct gprs_nsvc based on remote peer socket addr */ |
| 131 | static struct gprs_nsvc *nsvc_by_rem_addr(struct gprs_ns_inst *nsi, |
| 132 | struct sockaddr_in *sin) |
| 133 | { |
| 134 | struct gprs_nsvc *nsvc; |
| 135 | llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { |
Harald Welte | 517b77f | 2010-05-12 11:56:39 +0000 | [diff] [blame] | 136 | if (nsvc->ip.bts_addr.sin_addr.s_addr == |
| 137 | sin->sin_addr.s_addr && |
| 138 | nsvc->ip.bts_addr.sin_port == sin->sin_port) |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 139 | return nsvc; |
| 140 | } |
| 141 | return NULL; |
| 142 | } |
| 143 | |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 144 | static void gprs_ns_timer_cb(void *data); |
| 145 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 146 | struct gprs_nsvc *nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci) |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 147 | { |
| 148 | struct gprs_nsvc *nsvc; |
| 149 | |
| 150 | nsvc = talloc_zero(nsi, struct gprs_nsvc); |
| 151 | nsvc->nsvci = nsvci; |
| 152 | /* before RESET procedure: BLOCKED and DEAD */ |
| 153 | nsvc->state = NSE_S_BLOCKED; |
| 154 | nsvc->nsi = nsi; |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 155 | nsvc->timer.cb = gprs_ns_timer_cb; |
| 156 | nsvc->timer.data = nsvc; |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 157 | nsvc->ctrg = rate_ctr_group_alloc(nsvc, &nsvc_ctrg_desc, nsvci); |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 158 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 159 | llist_add(&nsvc->list, &nsi->gprs_nsvcs); |
| 160 | |
| 161 | return nsvc; |
| 162 | } |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 163 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 164 | void nsvc_delete(struct gprs_nsvc *nsvc) |
Harald Welte | 51cce2a | 2010-05-12 15:55:23 +0000 | [diff] [blame] | 165 | { |
| 166 | if (bsc_timer_pending(&nsvc->timer)) |
| 167 | bsc_del_timer(&nsvc->timer); |
| 168 | llist_del(&nsvc->list); |
| 169 | talloc_free(nsvc); |
| 170 | } |
| 171 | |
Harald Welte | 73c7b17 | 2010-05-11 10:15:26 +0200 | [diff] [blame] | 172 | static void ns_dispatch_signal(struct gprs_nsvc *nsvc, unsigned int signal, |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 173 | uint8_t cause) |
| 174 | { |
| 175 | struct ns_signal_data nssd; |
| 176 | |
| 177 | nssd.nsvc = nsvc; |
| 178 | nssd.cause = cause; |
| 179 | |
| 180 | dispatch_signal(SS_NS, signal, &nssd); |
| 181 | } |
| 182 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 183 | /* Section 10.3.2, Table 13 */ |
Harald Welte | 5fa9214 | 2010-05-02 09:37:45 +0200 | [diff] [blame] | 184 | static const struct value_string ns_cause_str[] = { |
| 185 | { NS_CAUSE_TRANSIT_FAIL, "Transit network failure" }, |
| 186 | { NS_CAUSE_OM_INTERVENTION, "O&M intervention" }, |
| 187 | { NS_CAUSE_EQUIP_FAIL, "Equipment failure" }, |
| 188 | { NS_CAUSE_NSVC_BLOCKED, "NS-VC blocked" }, |
| 189 | { NS_CAUSE_NSVC_UNKNOWN, "NS-VC unknown" }, |
| 190 | { NS_CAUSE_BVCI_UNKNOWN, "BVCI unknown" }, |
| 191 | { NS_CAUSE_SEM_INCORR_PDU, "Semantically incorrect PDU" }, |
| 192 | { NS_CAUSE_PDU_INCOMP_PSTATE, "PDU not compatible with protocol state" }, |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 193 | { NS_CAUSE_PROTO_ERR_UNSPEC, "Protocol error, unspecified" }, |
Harald Welte | 5fa9214 | 2010-05-02 09:37:45 +0200 | [diff] [blame] | 194 | { NS_CAUSE_INVAL_ESSENT_IE, "Invalid essential IE" }, |
| 195 | { NS_CAUSE_MISSING_ESSENT_IE, "Missing essential IE" }, |
| 196 | { 0, NULL } |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 197 | }; |
| 198 | |
Harald Welte | 5fa9214 | 2010-05-02 09:37:45 +0200 | [diff] [blame] | 199 | const char *gprs_ns_cause_str(enum ns_cause cause) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 200 | { |
Harald Welte | 5fa9214 | 2010-05-02 09:37:45 +0200 | [diff] [blame] | 201 | return get_value_string(ns_cause_str, cause); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 202 | } |
| 203 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 204 | static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg); |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 205 | extern int grps_ns_frgre_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 206 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 207 | static int gprs_ns_tx(struct gprs_nsvc *nsvc, struct msgb *msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 208 | { |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 209 | int ret; |
| 210 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 211 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 212 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 213 | /* Increment number of Uplink bytes */ |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 214 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_OUT]); |
| 215 | rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_OUT], msgb_l2len(msg)); |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 216 | |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 217 | switch (nsvc->ll) { |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 218 | case GPRS_NS_LL_UDP: |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 219 | ret = nsip_sendmsg(nsvc, msg); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 220 | break; |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 221 | case GPRS_NS_LL_FR_GRE: |
| 222 | ret = gprs_ns_frgre_sendmsg(nsvc, msg); |
| 223 | break; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 224 | default: |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 225 | LOGP(DNS, LOGL_ERROR, "unsupported NS linklayer %u\n", nsvc->ll); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 226 | msgb_free(msg); |
| 227 | ret = -EIO; |
| 228 | break; |
| 229 | } |
| 230 | return ret; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 231 | } |
| 232 | |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 233 | static int gprs_ns_tx_simple(struct gprs_nsvc *nsvc, uint8_t pdu_type) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 234 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 235 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 236 | struct gprs_ns_hdr *nsh; |
| 237 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 238 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 239 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 240 | if (!msg) |
| 241 | return -ENOMEM; |
| 242 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 243 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 244 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 245 | |
| 246 | nsh->pdu_type = pdu_type; |
| 247 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 248 | return gprs_ns_tx(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 249 | } |
| 250 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 251 | int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause) |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 252 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 253 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 254 | struct gprs_ns_hdr *nsh; |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 255 | uint16_t nsvci = htons(nsvc->nsvci); |
| 256 | uint16_t nsei = htons(nsvc->nsei); |
| 257 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 258 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 259 | |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 260 | if (!msg) |
| 261 | return -ENOMEM; |
| 262 | |
Harald Welte | e21988c | 2010-05-12 12:01:33 +0000 | [diff] [blame] | 263 | LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET (NSVCI=%u, cause=%s)\n", |
| 264 | nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| 265 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 266 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 267 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 268 | nsh->pdu_type = NS_PDUT_RESET; |
| 269 | |
| 270 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 271 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| 272 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *) &nsei); |
| 273 | |
| 274 | return gprs_ns_tx(nsvc, msg); |
| 275 | |
| 276 | } |
| 277 | |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 278 | int gprs_ns_tx_status(struct gprs_nsvc *nsvc, uint8_t cause, |
| 279 | uint16_t bvci, struct msgb *orig_msg) |
| 280 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 281 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 282 | struct gprs_ns_hdr *nsh; |
| 283 | uint16_t nsvci = htons(nsvc->nsvci); |
| 284 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 285 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 286 | |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 287 | bvci = htons(bvci); |
| 288 | |
| 289 | if (!msg) |
| 290 | return -ENOMEM; |
| 291 | |
Harald Welte | 1882486 | 2010-05-15 23:02:24 +0200 | [diff] [blame] | 292 | LOGP(DNS, LOGL_NOTICE, "NSEI=%u Tx NS STATUS (NSVCI=%u, cause=%s)\n", |
Harald Welte | e21988c | 2010-05-12 12:01:33 +0000 | [diff] [blame] | 293 | nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| 294 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 295 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 296 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 297 | nsh->pdu_type = NS_PDUT_STATUS; |
| 298 | |
| 299 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 300 | |
| 301 | /* Section 9.2.7.1: Static conditions for NS-VCI */ |
| 302 | if (cause == NS_CAUSE_NSVC_BLOCKED || |
| 303 | cause == NS_CAUSE_NSVC_UNKNOWN) |
| 304 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| 305 | |
| 306 | /* Section 9.2.7.2: Static conditions for NS PDU */ |
| 307 | switch (cause) { |
| 308 | case NS_CAUSE_SEM_INCORR_PDU: |
| 309 | case NS_CAUSE_PDU_INCOMP_PSTATE: |
| 310 | case NS_CAUSE_PROTO_ERR_UNSPEC: |
| 311 | case NS_CAUSE_INVAL_ESSENT_IE: |
| 312 | case NS_CAUSE_MISSING_ESSENT_IE: |
| 313 | msgb_tvlv_put(msg, NS_IE_PDU, msgb_l2len(orig_msg), |
| 314 | orig_msg->l2h); |
| 315 | break; |
| 316 | default: |
| 317 | break; |
| 318 | } |
| 319 | |
| 320 | /* Section 9.2.7.3: Static conditions for BVCI */ |
| 321 | if (cause == NS_CAUSE_BVCI_UNKNOWN) |
| 322 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&bvci); |
| 323 | |
| 324 | return gprs_ns_tx(nsvc, msg); |
| 325 | } |
| 326 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 327 | int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause) |
| 328 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 329 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 330 | struct gprs_ns_hdr *nsh; |
| 331 | uint16_t nsvci = htons(nsvc->nsvci); |
| 332 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 333 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 334 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 335 | if (!msg) |
| 336 | return -ENOMEM; |
| 337 | |
Harald Welte | e21988c | 2010-05-12 12:01:33 +0000 | [diff] [blame] | 338 | LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS BLOCK (NSVCI=%u, cause=%s)\n", |
| 339 | nsvc->nsei, nsvc->nsvci, gprs_ns_cause_str(cause)); |
| 340 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 341 | /* be conservative and mark it as blocked even now! */ |
| 342 | nsvc->state |= NSE_S_BLOCKED; |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 343 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 344 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 345 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 346 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 347 | nsh->pdu_type = NS_PDUT_BLOCK; |
| 348 | |
| 349 | msgb_tvlv_put(msg, NS_IE_CAUSE, 1, &cause); |
| 350 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *) &nsvci); |
| 351 | |
| 352 | return gprs_ns_tx(nsvc, msg); |
| 353 | } |
| 354 | |
| 355 | int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc) |
| 356 | { |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 357 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | e21988c | 2010-05-12 12:01:33 +0000 | [diff] [blame] | 358 | LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n", |
| 359 | nsvc->nsei, nsvc->nsvci); |
| 360 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 361 | return gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK); |
| 362 | } |
| 363 | |
Harald Welte | 9a4847f | 2010-05-12 12:11:45 +0000 | [diff] [blame] | 364 | int gprs_ns_tx_alive(struct gprs_nsvc *nsvc) |
| 365 | { |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 366 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 9a4847f | 2010-05-12 12:11:45 +0000 | [diff] [blame] | 367 | LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE (NSVCI=%u)\n", |
| 368 | nsvc->nsei, nsvc->nsvci); |
| 369 | |
| 370 | return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE); |
| 371 | } |
| 372 | |
| 373 | int gprs_ns_tx_alive_ack(struct gprs_nsvc *nsvc) |
| 374 | { |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 375 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 9a4847f | 2010-05-12 12:11:45 +0000 | [diff] [blame] | 376 | LOGP(DNS, LOGL_DEBUG, "NSEI=%u Tx NS ALIVE_ACK (NSVCI=%u)\n", |
| 377 | nsvc->nsei, nsvc->nsvci); |
| 378 | |
| 379 | return gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE_ACK); |
| 380 | } |
| 381 | |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 382 | static const enum ns_timeout timer_mode_tout[_NSVC_TIMER_NR] = { |
| 383 | [NSVC_TIMER_TNS_RESET] = NS_TOUT_TNS_RESET, |
| 384 | [NSVC_TIMER_TNS_ALIVE] = NS_TOUT_TNS_ALIVE, |
| 385 | [NSVC_TIMER_TNS_TEST] = NS_TOUT_TNS_TEST, |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 386 | }; |
| 387 | |
Harald Welte | 6ec997f | 2010-05-12 12:21:52 +0000 | [diff] [blame] | 388 | static const struct value_string timer_mode_strs[] = { |
| 389 | { NSVC_TIMER_TNS_RESET, "tns-reset" }, |
| 390 | { NSVC_TIMER_TNS_ALIVE, "tns-alive" }, |
| 391 | { NSVC_TIMER_TNS_TEST, "tns-test" }, |
| 392 | { 0, NULL } |
| 393 | }; |
| 394 | |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 395 | static void nsvc_start_timer(struct gprs_nsvc *nsvc, enum nsvc_timer_mode mode) |
| 396 | { |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 397 | enum ns_timeout tout = timer_mode_tout[mode]; |
| 398 | unsigned int seconds = nsvc->nsi->timeout[tout]; |
| 399 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 400 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 4574420 | 2010-05-12 13:55:36 +0000 | [diff] [blame] | 401 | DEBUGP(DNS, "NSEI=%u Starting timer in mode %s (%u seconds)\n", |
| 402 | nsvc->nsei, get_value_string(timer_mode_strs, mode), |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 403 | seconds); |
Harald Welte | 6ec997f | 2010-05-12 12:21:52 +0000 | [diff] [blame] | 404 | |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 405 | if (bsc_timer_pending(&nsvc->timer)) |
| 406 | bsc_del_timer(&nsvc->timer); |
| 407 | |
| 408 | nsvc->timer_mode = mode; |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 409 | bsc_schedule_timer(&nsvc->timer, seconds, 0); |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 410 | } |
| 411 | |
Harald Welte | 881c205 | 2010-05-03 20:16:13 +0200 | [diff] [blame] | 412 | static void gprs_ns_timer_cb(void *data) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 413 | { |
| 414 | struct gprs_nsvc *nsvc = data; |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 415 | enum ns_timeout tout = timer_mode_tout[nsvc->timer_mode]; |
| 416 | unsigned int seconds = nsvc->nsi->timeout[tout]; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 417 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 418 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 4574420 | 2010-05-12 13:55:36 +0000 | [diff] [blame] | 419 | DEBUGP(DNS, "NSEI=%u Timer expired in mode %s (%u seconds)\n", |
| 420 | nsvc->nsei, get_value_string(timer_mode_strs, nsvc->timer_mode), |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 421 | seconds); |
Harald Welte | 6ec997f | 2010-05-12 12:21:52 +0000 | [diff] [blame] | 422 | |
Harald Welte | 881c205 | 2010-05-03 20:16:13 +0200 | [diff] [blame] | 423 | switch (nsvc->timer_mode) { |
| 424 | case NSVC_TIMER_TNS_ALIVE: |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 425 | /* Tns-alive case: we expired without response ! */ |
| 426 | nsvc->alive_retries++; |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 427 | if (nsvc->alive_retries > |
| 428 | nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]) { |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 429 | /* mark as dead and blocked */ |
| 430 | nsvc->state = NSE_S_BLOCKED; |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 431 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); |
| 432 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_DEAD]); |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 433 | LOGP(DNS, LOGL_NOTICE, |
| 434 | "NSEI=%u Tns-alive expired more then " |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 435 | "%u times, blocking NS-VC\n", nsvc->nsei, |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 436 | nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]); |
Harald Welte | fa41cb7 | 2010-05-12 13:28:25 +0000 | [diff] [blame] | 437 | ns_dispatch_signal(nsvc, S_NS_ALIVE_EXP, 0); |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 438 | ns_dispatch_signal(nsvc, S_NS_BLOCK, NS_CAUSE_NSVC_BLOCKED); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 439 | return; |
| 440 | } |
Harald Welte | 9a4847f | 2010-05-12 12:11:45 +0000 | [diff] [blame] | 441 | /* Tns-test case: send NS-ALIVE PDU */ |
| 442 | gprs_ns_tx_alive(nsvc); |
| 443 | /* start Tns-alive timer */ |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 444 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
Harald Welte | 881c205 | 2010-05-03 20:16:13 +0200 | [diff] [blame] | 445 | break; |
| 446 | case NSVC_TIMER_TNS_TEST: |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 447 | /* Tns-test case: send NS-ALIVE PDU */ |
Harald Welte | 9a4847f | 2010-05-12 12:11:45 +0000 | [diff] [blame] | 448 | gprs_ns_tx_alive(nsvc); |
| 449 | /* start Tns-alive timer (transition into faster |
| 450 | * alive retransmissions) */ |
Harald Welte | 6ec997f | 2010-05-12 12:21:52 +0000 | [diff] [blame] | 451 | nsvc->alive_retries = 0; |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 452 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
| 453 | break; |
| 454 | case NSVC_TIMER_TNS_RESET: |
| 455 | /* Chapter 7.3: Re-send the RESET */ |
Harald Welte | 81926ba | 2010-05-03 21:05:24 +0200 | [diff] [blame] | 456 | gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 457 | /* Re-start Tns-reset timer */ |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 458 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); |
Harald Welte | 881c205 | 2010-05-03 20:16:13 +0200 | [diff] [blame] | 459 | break; |
Harald Welte | 73c7b17 | 2010-05-11 10:15:26 +0200 | [diff] [blame] | 460 | case _NSVC_TIMER_NR: |
| 461 | break; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 462 | } |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 463 | } |
| 464 | |
| 465 | /* Section 9.2.6 */ |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 466 | static int gprs_ns_tx_reset_ack(struct gprs_nsvc *nsvc) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 467 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 468 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 469 | struct gprs_ns_hdr *nsh; |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 470 | uint16_t nsvci, nsei; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 471 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 472 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 473 | if (!msg) |
| 474 | return -ENOMEM; |
| 475 | |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 476 | nsvci = htons(nsvc->nsvci); |
| 477 | nsei = htons(nsvc->nsei); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 478 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 479 | msg->l2h = msgb_put(msg, sizeof(*nsh)); |
| 480 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 481 | |
| 482 | nsh->pdu_type = NS_PDUT_RESET_ACK; |
| 483 | |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 484 | LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS RESET ACK (NSVCI=%u)\n", |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 485 | nsvc->nsei, nsvc->nsvci); |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 486 | |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 487 | msgb_tvlv_put(msg, NS_IE_VCI, 2, (uint8_t *)&nsvci); |
| 488 | msgb_tvlv_put(msg, NS_IE_NSEI, 2, (uint8_t *)&nsei); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 489 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 490 | return gprs_ns_tx(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 491 | } |
| 492 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 493 | /* Section 9.2.10: transmit side / NS-UNITDATA-REQUEST primitive */ |
| 494 | int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 495 | { |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 496 | struct gprs_nsvc *nsvc; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 497 | struct gprs_ns_hdr *nsh; |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 498 | uint16_t bvci = msgb_bvci(msg); |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 499 | |
| 500 | nsvc = nsvc_by_nsei(nsi, msgb_nsei(msg)); |
| 501 | if (!nsvc) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 502 | LOGP(DNS, LOGL_ERROR, "Unable to resolve NSEI %u " |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 503 | "to NS-VC!\n", msgb_nsei(msg)); |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 504 | return -EINVAL; |
| 505 | } |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 506 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 507 | |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 508 | if (!(nsvc->state & NSE_S_ALIVE)) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 509 | LOGP(DNS, LOGL_ERROR, "NSEI=%u is not alive, cannot send\n", |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 510 | nsvc->nsei); |
| 511 | return -EBUSY; |
| 512 | } |
| 513 | if (nsvc->state & NSE_S_BLOCKED) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 514 | LOGP(DNS, LOGL_ERROR, "NSEI=%u is blocked, cannot send\n", |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 515 | nsvc->nsei); |
| 516 | return -EBUSY; |
| 517 | } |
| 518 | |
Harald Welte | 3bd95d5 | 2010-05-13 12:18:49 +0200 | [diff] [blame] | 519 | msg->l2h = msgb_push(msg, sizeof(*nsh) + 3); |
| 520 | nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 521 | if (!nsh) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 522 | LOGP(DNS, LOGL_ERROR, "Not enough headroom for NS header\n"); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 523 | return -EIO; |
| 524 | } |
| 525 | |
| 526 | nsh->pdu_type = NS_PDUT_UNITDATA; |
| 527 | /* spare octet in data[0] */ |
| 528 | nsh->data[1] = bvci >> 8; |
| 529 | nsh->data[2] = bvci & 0xff; |
| 530 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 531 | return gprs_ns_tx(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | /* Section 9.2.10: receive side */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 535 | static int gprs_ns_rx_unitdata(struct gprs_nsvc *nsvc, struct msgb *msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 536 | { |
| 537 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *)msg->l2h; |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 538 | uint16_t bvci; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 539 | |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 540 | if (nsvc->state & NSE_S_BLOCKED) |
| 541 | return gprs_ns_tx_status(nsvc, NS_CAUSE_NSVC_BLOCKED, |
| 542 | 0, msg); |
| 543 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 544 | /* spare octet in data[0] */ |
| 545 | bvci = nsh->data[1] << 8 | nsh->data[2]; |
Harald Welte | 7316440 | 2010-05-02 09:50:42 +0200 | [diff] [blame] | 546 | msgb_bssgph(msg) = &nsh->data[3]; |
Harald Welte | a6e3270 | 2010-05-02 11:19:37 +0200 | [diff] [blame] | 547 | msgb_bvci(msg) = bvci; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 548 | |
| 549 | /* call upper layer (BSSGP) */ |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 550 | return nsvc->nsi->cb(GPRS_NS_EVT_UNIT_DATA, nsvc, msg, bvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 551 | } |
| 552 | |
| 553 | /* Section 9.2.7 */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 554 | static int gprs_ns_rx_status(struct gprs_nsvc *nsvc, struct msgb *msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 555 | { |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 556 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 557 | struct tlv_parsed tp; |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 558 | uint8_t cause; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 559 | int rc; |
| 560 | |
Harald Welte | ebacf4d | 2010-05-16 00:24:26 +0200 | [diff] [blame] | 561 | LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx NS STATUS ", nsvc->nsei); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 562 | |
| 563 | rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0); |
| 564 | |
| 565 | if (!TLVP_PRESENT(&tp, NS_IE_CAUSE)) { |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 566 | LOGPC(DNS, LOGL_INFO, "missing cause IE\n"); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 567 | return -EINVAL; |
| 568 | } |
| 569 | |
| 570 | cause = *TLVP_VAL(&tp, NS_IE_CAUSE); |
Harald Welte | ebacf4d | 2010-05-16 00:24:26 +0200 | [diff] [blame] | 571 | LOGPC(DNS, LOGL_NOTICE, "cause=%s\n", gprs_ns_cause_str(cause)); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 572 | |
| 573 | return 0; |
| 574 | } |
| 575 | |
| 576 | /* Section 7.3 */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 577 | static int gprs_ns_rx_reset(struct gprs_nsvc *nsvc, struct msgb *msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 578 | { |
| 579 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 580 | struct tlv_parsed tp; |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 581 | uint8_t *cause; |
| 582 | uint16_t *nsvci, *nsei; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 583 | int rc; |
| 584 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 585 | rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0); |
| 586 | |
| 587 | if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| 588 | !TLVP_PRESENT(&tp, NS_IE_VCI) || |
| 589 | !TLVP_PRESENT(&tp, NS_IE_NSEI)) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 590 | LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 591 | gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 592 | return -EINVAL; |
| 593 | } |
| 594 | |
Harald Welte | d85d9a9 | 2010-05-02 11:26:34 +0200 | [diff] [blame] | 595 | cause = (uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE); |
| 596 | nsvci = (uint16_t *) TLVP_VAL(&tp, NS_IE_VCI); |
| 597 | nsei = (uint16_t *) TLVP_VAL(&tp, NS_IE_NSEI); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 598 | |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 599 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS RESET (NSVCI=%u, cause=%s)\n", |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 600 | nsvc->nsvci, nsvc->nsei, gprs_ns_cause_str(*cause)); |
| 601 | |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 602 | /* Mark NS-VC as blocked and alive */ |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 603 | nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE; |
Harald Welte | f44448d | 2010-05-11 18:18:31 +0200 | [diff] [blame] | 604 | |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 605 | nsvc->nsei = ntohs(*nsei); |
| 606 | nsvc->nsvci = ntohs(*nsvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 607 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 608 | /* start the test procedure */ |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 609 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 610 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 611 | /* inform interested parties about the fact that this NSVC |
| 612 | * has received RESET */ |
Harald Welte | 73c7b17 | 2010-05-11 10:15:26 +0200 | [diff] [blame] | 613 | ns_dispatch_signal(nsvc, S_NS_RESET, *cause); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 614 | |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 615 | return gprs_ns_tx_reset_ack(nsvc); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 616 | } |
| 617 | |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 618 | static int gprs_ns_rx_block(struct gprs_nsvc *nsvc, struct msgb *msg) |
| 619 | { |
| 620 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 621 | struct tlv_parsed tp; |
| 622 | uint8_t *cause; |
| 623 | int rc; |
| 624 | |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 625 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK\n", nsvc->nsei); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 626 | |
| 627 | nsvc->state |= NSE_S_BLOCKED; |
| 628 | |
| 629 | rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, msgb_l2len(msg), 0, 0); |
| 630 | |
| 631 | if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| 632 | !TLVP_PRESENT(&tp, NS_IE_VCI)) { |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 633 | LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 634 | gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, msg); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 635 | return -EINVAL; |
| 636 | } |
| 637 | |
| 638 | cause = (uint8_t *) TLVP_VAL(&tp, NS_IE_CAUSE); |
| 639 | //nsvci = (uint16_t *) TLVP_VAL(&tp, NS_IE_VCI); |
| 640 | |
Harald Welte | 73c7b17 | 2010-05-11 10:15:26 +0200 | [diff] [blame] | 641 | ns_dispatch_signal(nsvc, S_NS_BLOCK, *cause); |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 642 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 643 | |
| 644 | return gprs_ns_tx_simple(nsvc, NS_PDUT_BLOCK_ACK); |
| 645 | } |
| 646 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 647 | /* main entry point, here incoming NS frames enter */ |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 648 | int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 649 | struct sockaddr_in *saddr, enum gprs_ns_ll ll) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 650 | { |
| 651 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 652 | struct gprs_nsvc *nsvc; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 653 | int rc = 0; |
| 654 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 655 | /* look up the NSVC based on source address */ |
| 656 | nsvc = nsvc_by_rem_addr(nsi, saddr); |
| 657 | if (!nsvc) { |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 658 | struct tlv_parsed tp; |
| 659 | uint16_t nsei; |
Harald Welte | 3ea0971 | 2010-05-19 16:01:39 +0200 | [diff] [blame] | 660 | if (nsh->pdu_type == NS_PDUT_STATUS) { |
| 661 | LOGP(DNS, LOGL_INFO, "Ignoring NS STATUS from %s:%u " |
| 662 | "for non-existing NS-VC\n", |
| 663 | inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port)); |
| 664 | return 0; |
| 665 | } |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 666 | /* Only the RESET procedure creates a new NSVC */ |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 667 | if (nsh->pdu_type != NS_PDUT_RESET) { |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 668 | /* Since we have no NSVC, we have to use a fake */ |
| 669 | nsvc = nsi->unknown_nsvc; |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 670 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 671 | LOGP(DNS, LOGL_INFO, "Rejecting NS PDU type 0x%0x " |
Harald Welte | c8c3de3 | 2010-05-11 18:38:36 +0200 | [diff] [blame] | 672 | "from %s:%u for non-existing NS-VC\n", |
| 673 | nsh->pdu_type, inet_ntoa(saddr->sin_addr), |
| 674 | ntohs(saddr->sin_port)); |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 675 | nsvc->nsvci = nsvc->nsei = 0xfffe; |
| 676 | nsvc->ip.bts_addr = *saddr; |
| 677 | nsvc->state = NSE_S_ALIVE; |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 678 | nsvc->ll = ll; |
Harald Welte | eb471c9 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 679 | #if 0 |
| 680 | return gprs_ns_tx_reset(nsvc, NS_CAUSE_PDU_INCOMP_PSTATE); |
| 681 | #else |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 682 | return gprs_ns_tx_status(nsvc, |
Harald Welte | 78681af | 2010-05-12 13:51:08 +0000 | [diff] [blame] | 683 | NS_CAUSE_PDU_INCOMP_PSTATE, 0, |
| 684 | msg); |
Harald Welte | eb471c9 | 2010-05-18 14:32:29 +0200 | [diff] [blame] | 685 | #endif |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 686 | } |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 687 | rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, |
| 688 | msgb_l2len(msg), 0, 0); |
| 689 | if (!TLVP_PRESENT(&tp, NS_IE_CAUSE) || |
| 690 | !TLVP_PRESENT(&tp, NS_IE_VCI) || |
| 691 | !TLVP_PRESENT(&tp, NS_IE_NSEI)) { |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 692 | LOGP(DNS, LOGL_ERROR, "NS RESET Missing mandatory IE\n"); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 693 | gprs_ns_tx_status(nsvc, NS_CAUSE_MISSING_ESSENT_IE, 0, |
| 694 | msg); |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 695 | return -EINVAL; |
| 696 | } |
| 697 | nsei = ntohs(*(uint16_t *)TLVP_VAL(&tp, NS_IE_NSEI)); |
| 698 | /* Check if we already know this NSEI, the remote end might |
| 699 | * simply have changed addresses, or it is a SGSN */ |
| 700 | nsvc = nsvc_by_nsei(nsi, nsei); |
| 701 | if (!nsvc) { |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 702 | nsvc = nsvc_create(nsi, 0xffff); |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 703 | nsvc->ll = ll; |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 704 | log_set_context(BSC_CTX_NSVC, nsvc); |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 705 | LOGP(DNS, LOGL_INFO, "Creating NS-VC for BSS at %s:%u\n", |
| 706 | inet_ntoa(saddr->sin_addr), ntohs(saddr->sin_port)); |
Harald Welte | d2e5ed0 | 2010-05-11 18:30:37 +0200 | [diff] [blame] | 707 | } |
Harald Welte | 19b96b9 | 2010-05-11 18:40:45 +0200 | [diff] [blame] | 708 | /* Update the remote peer IP address/port */ |
| 709 | nsvc->ip.bts_addr = *saddr; |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 710 | } else |
| 711 | msgb_nsei(msg) = nsvc->nsei; |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 712 | |
Harald Welte | c488cef | 2010-05-15 23:52:02 +0200 | [diff] [blame] | 713 | log_set_context(BSC_CTX_NSVC, nsvc); |
| 714 | |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 715 | /* Increment number of Incoming bytes */ |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 716 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_PKTS_IN]); |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 717 | rate_ctr_add(&nsvc->ctrg->ctr[NS_CTR_BYTES_IN], msgb_l2len(msg)); |
Harald Welte | c80bb28 | 2010-05-13 11:45:07 +0200 | [diff] [blame] | 718 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 719 | switch (nsh->pdu_type) { |
| 720 | case NS_PDUT_ALIVE: |
Harald Welte | 51cce2a | 2010-05-12 15:55:23 +0000 | [diff] [blame] | 721 | /* If we're dead and blocked and suddenly receive a |
| 722 | * NS-ALIVE out of the blue, we might have been re-started |
| 723 | * and should send a NS-RESET to make sure everything recovers |
| 724 | * fine. */ |
| 725 | if (nsvc->state == NSE_S_BLOCKED) |
| 726 | rc = gprs_ns_tx_reset(nsvc, NS_CAUSE_PDU_INCOMP_PSTATE); |
| 727 | else |
| 728 | rc = gprs_ns_tx_alive_ack(nsvc); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 729 | break; |
| 730 | case NS_PDUT_ALIVE_ACK: |
Harald Welte | 1882486 | 2010-05-15 23:02:24 +0200 | [diff] [blame] | 731 | /* stop Tns-alive and start Tns-test */ |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 732 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_TEST); |
Harald Welte | 1bb9e79 | 2010-05-03 21:11:22 +0200 | [diff] [blame] | 733 | if (nsvc->remote_end_is_sgsn) { |
| 734 | /* FIXME: this should be one level higher */ |
| 735 | if (nsvc->state & NSE_S_BLOCKED) |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 736 | rc = gprs_ns_tx_unblock(nsvc); |
Harald Welte | 1bb9e79 | 2010-05-03 21:11:22 +0200 | [diff] [blame] | 737 | } |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 738 | break; |
| 739 | case NS_PDUT_UNITDATA: |
| 740 | /* actual user data */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 741 | rc = gprs_ns_rx_unitdata(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 742 | break; |
| 743 | case NS_PDUT_STATUS: |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 744 | rc = gprs_ns_rx_status(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 745 | break; |
| 746 | case NS_PDUT_RESET: |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 747 | rc = gprs_ns_rx_reset(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 748 | break; |
| 749 | case NS_PDUT_RESET_ACK: |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 750 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS RESET ACK\n", nsvc->nsei); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 751 | /* mark NS-VC as blocked + active */ |
| 752 | nsvc->state = NSE_S_BLOCKED | NSE_S_ALIVE; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 753 | nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE; |
Harald Welte | 7e85eaf | 2010-05-13 12:55:20 +0200 | [diff] [blame] | 754 | rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 755 | if (nsvc->persistent || nsvc->remote_end_is_sgsn) { |
Harald Welte | ec4c159 | 2010-05-03 20:55:10 +0200 | [diff] [blame] | 756 | /* stop RESET timer */ |
| 757 | bsc_del_timer(&nsvc->timer); |
| 758 | } |
Harald Welte | 1882486 | 2010-05-15 23:02:24 +0200 | [diff] [blame] | 759 | /* Initiate TEST proc.: Send ALIVE and start timer */ |
| 760 | rc = gprs_ns_tx_simple(nsvc, NS_PDUT_ALIVE); |
| 761 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 762 | break; |
| 763 | case NS_PDUT_UNBLOCK: |
| 764 | /* Section 7.2: unblocking procedure */ |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 765 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK\n", nsvc->nsei); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 766 | nsvc->state &= ~NSE_S_BLOCKED; |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 767 | ns_dispatch_signal(nsvc, S_NS_UNBLOCK, 0); |
Harald Welte | 7491c77 | 2010-03-18 00:01:43 +0800 | [diff] [blame] | 768 | rc = gprs_ns_tx_simple(nsvc, NS_PDUT_UNBLOCK_ACK); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 769 | break; |
| 770 | case NS_PDUT_UNBLOCK_ACK: |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 771 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS UNBLOCK ACK\n", nsvc->nsei); |
Harald Welte | dae2ab3 | 2010-05-12 11:48:44 +0200 | [diff] [blame] | 772 | /* mark NS-VC as unblocked + active */ |
| 773 | nsvc->state = NSE_S_ALIVE; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 774 | nsvc->remote_state = NSE_S_ALIVE; |
Harald Welte | 4108b38 | 2010-05-12 14:18:46 +0000 | [diff] [blame] | 775 | ns_dispatch_signal(nsvc, S_NS_UNBLOCK, 0); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 776 | break; |
| 777 | case NS_PDUT_BLOCK: |
Harald Welte | 7b73377 | 2010-05-11 06:20:54 +0200 | [diff] [blame] | 778 | rc = gprs_ns_rx_block(nsvc, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 779 | break; |
| 780 | case NS_PDUT_BLOCK_ACK: |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 781 | LOGP(DNS, LOGL_INFO, "NSEI=%u Rx NS BLOCK ACK\n", nsvc->nsei); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 782 | /* mark remote NS-VC as blocked + active */ |
| 783 | nsvc->remote_state = NSE_S_BLOCKED | NSE_S_ALIVE; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 784 | break; |
| 785 | default: |
Harald Welte | c729e2b | 2010-05-12 00:16:57 +0200 | [diff] [blame] | 786 | LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx Unknown NS PDU type 0x%02x\n", |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 787 | nsvc->nsei, nsh->pdu_type); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 788 | rc = -EINVAL; |
| 789 | break; |
| 790 | } |
| 791 | return rc; |
| 792 | } |
| 793 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 794 | struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb) |
| 795 | { |
| 796 | struct gprs_ns_inst *nsi = talloc_zero(tall_bsc_ctx, struct gprs_ns_inst); |
| 797 | |
| 798 | nsi->cb = cb; |
| 799 | INIT_LLIST_HEAD(&nsi->gprs_nsvcs); |
Harald Welte | d6b62e3 | 2010-05-12 17:19:53 +0000 | [diff] [blame] | 800 | nsi->timeout[NS_TOUT_TNS_BLOCK] = 3; |
| 801 | nsi->timeout[NS_TOUT_TNS_BLOCK_RETRIES] = 3; |
| 802 | nsi->timeout[NS_TOUT_TNS_RESET] = 3; |
| 803 | nsi->timeout[NS_TOUT_TNS_RESET_RETRIES] = 3; |
| 804 | nsi->timeout[NS_TOUT_TNS_TEST] = 30; |
| 805 | nsi->timeout[NS_TOUT_TNS_ALIVE] = 3; |
| 806 | nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES] = 10; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 807 | |
Harald Welte | e24ccf7 | 2010-05-13 14:20:56 +0200 | [diff] [blame] | 808 | /* Create the dummy NSVC that we use for sending |
| 809 | * messages to non-existant/unknown NS-VC's */ |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 810 | nsi->unknown_nsvc = nsvc_create(nsi, 0xfffe); |
Harald Welte | e24ccf7 | 2010-05-13 14:20:56 +0200 | [diff] [blame] | 811 | llist_del(&nsi->unknown_nsvc->list); |
Harald Welte | 27fcca9 | 2010-05-13 13:58:08 +0200 | [diff] [blame] | 812 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 813 | return nsi; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 814 | } |
| 815 | |
| 816 | void gprs_ns_destroy(struct gprs_ns_inst *nsi) |
| 817 | { |
| 818 | /* FIXME: clear all timers */ |
| 819 | |
| 820 | /* recursively free the NSI and all its NSVCs */ |
| 821 | talloc_free(nsi); |
| 822 | } |
| 823 | |
| 824 | |
| 825 | /* NS-over-IP code, according to 3GPP TS 48.016 Chapter 6.2 |
| 826 | * We don't support Size Procedure, Configuration Procedure, ChangeWeight Procedure */ |
| 827 | |
| 828 | /* Read a single NS-over-IP message */ |
| 829 | static struct msgb *read_nsip_msg(struct bsc_fd *bfd, int *error, |
| 830 | struct sockaddr_in *saddr) |
| 831 | { |
Harald Welte | 22bc7d2 | 2010-05-19 15:38:10 +0200 | [diff] [blame] | 832 | struct msgb *msg = gprs_ns_msgb_alloc(); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 833 | int ret = 0; |
| 834 | socklen_t saddr_len = sizeof(*saddr); |
| 835 | |
| 836 | if (!msg) { |
| 837 | *error = -ENOMEM; |
| 838 | return NULL; |
| 839 | } |
| 840 | |
| 841 | ret = recvfrom(bfd->fd, msg->data, NS_ALLOC_SIZE, 0, |
| 842 | (struct sockaddr *)saddr, &saddr_len); |
| 843 | if (ret < 0) { |
Harald Welte | ae14132 | 2010-05-11 05:54:22 +0200 | [diff] [blame] | 844 | LOGP(DNS, LOGL_ERROR, "recv error %s during NSIP recv\n", |
Harald Welte | ebcd1b7 | 2010-05-03 18:54:12 +0200 | [diff] [blame] | 845 | strerror(errno)); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 846 | msgb_free(msg); |
| 847 | *error = ret; |
| 848 | return NULL; |
| 849 | } else if (ret == 0) { |
| 850 | msgb_free(msg); |
| 851 | *error = ret; |
| 852 | return NULL; |
| 853 | } |
| 854 | |
| 855 | msg->l2h = msg->data; |
| 856 | msgb_put(msg, ret); |
| 857 | |
| 858 | return msg; |
| 859 | } |
| 860 | |
| 861 | static int handle_nsip_read(struct bsc_fd *bfd) |
| 862 | { |
| 863 | int error; |
| 864 | struct sockaddr_in saddr; |
| 865 | struct gprs_ns_inst *nsi = bfd->data; |
| 866 | struct msgb *msg = read_nsip_msg(bfd, &error, &saddr); |
| 867 | |
| 868 | if (!msg) |
| 869 | return error; |
| 870 | |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 871 | error = gprs_ns_rcvmsg(nsi, msg, &saddr, GPRS_NS_LL_UDP); |
Harald Welte | d8f2271 | 2010-05-12 18:38:45 +0000 | [diff] [blame] | 872 | |
| 873 | msgb_free(msg); |
| 874 | |
| 875 | return error; |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 876 | } |
| 877 | |
| 878 | static int handle_nsip_write(struct bsc_fd *bfd) |
| 879 | { |
| 880 | /* FIXME: actually send the data here instead of nsip_sendmsg() */ |
| 881 | return -EIO; |
| 882 | } |
| 883 | |
Harald Welte | ba1f931 | 2010-05-19 14:38:50 +0200 | [diff] [blame] | 884 | static int nsip_sendmsg(struct gprs_nsvc *nsvc, struct msgb *msg) |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 885 | { |
| 886 | int rc; |
| 887 | struct gprs_ns_inst *nsi = nsvc->nsi; |
| 888 | struct sockaddr_in *daddr = &nsvc->ip.bts_addr; |
| 889 | |
| 890 | rc = sendto(nsi->nsip.fd.fd, msg->data, msg->len, 0, |
| 891 | (struct sockaddr *)daddr, sizeof(*daddr)); |
| 892 | |
| 893 | talloc_free(msg); |
| 894 | |
| 895 | return rc; |
| 896 | } |
| 897 | |
| 898 | /* UDP Port 23000 carries the LLC-in-BSSGP-in-NS protocol stack */ |
| 899 | static int nsip_fd_cb(struct bsc_fd *bfd, unsigned int what) |
| 900 | { |
| 901 | int rc = 0; |
| 902 | |
| 903 | if (what & BSC_FD_READ) |
| 904 | rc = handle_nsip_read(bfd); |
| 905 | if (what & BSC_FD_WRITE) |
| 906 | rc = handle_nsip_write(bfd); |
| 907 | |
| 908 | return rc; |
| 909 | } |
| 910 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 911 | /* Listen for incoming GPRS packets */ |
Harald Welte | 31f0a23 | 2010-05-19 15:09:09 +0200 | [diff] [blame] | 912 | int gprs_ns_nsip_listen(struct gprs_ns_inst *nsi) |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 913 | { |
| 914 | int ret; |
| 915 | |
Harald Welte | 31f0a23 | 2010-05-19 15:09:09 +0200 | [diff] [blame] | 916 | ret = make_sock(&nsi->nsip.fd, IPPROTO_UDP, nsi->nsip.local_ip, |
| 917 | nsi->nsip.local_port, nsip_fd_cb); |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 918 | if (ret < 0) |
| 919 | return ret; |
| 920 | |
Harald Welte | f67a5f9 | 2010-04-26 19:18:54 +0200 | [diff] [blame] | 921 | nsi->nsip.fd.data = nsi; |
| 922 | |
| 923 | return ret; |
| 924 | } |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 925 | |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 926 | /* Initiate a RESET procedure */ |
Holger Hans Peter Freyther | 956e2b0 | 2010-05-23 21:18:01 +0800 | [diff] [blame^] | 927 | void gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause) |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 928 | { |
| 929 | /* Mark NS-VC locally as blocked and dead */ |
| 930 | nsvc->state = NSE_S_BLOCKED; |
| 931 | /* Send NS-RESET PDU */ |
| 932 | if (gprs_ns_tx_reset(nsvc, cause) < 0) { |
| 933 | LOGP(DNS, LOGL_ERROR, "NSEI=%u, error resetting NS-VC\n", |
| 934 | nsvc->nsei); |
| 935 | } |
| 936 | /* Start Tns-reset */ |
| 937 | nsvc_start_timer(nsvc, NSVC_TIMER_TNS_RESET); |
Harald Welte | 9ee404a | 2010-05-14 11:53:08 +0000 | [diff] [blame] | 938 | } |
| 939 | |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 940 | /* Establish a connection (from the BSS) to the SGSN */ |
| 941 | struct gprs_nsvc *nsip_connect(struct gprs_ns_inst *nsi, |
Harald Welte | 323e4f6 | 2010-05-01 11:28:43 +0200 | [diff] [blame] | 942 | struct sockaddr_in *dest, uint16_t nsei, |
| 943 | uint16_t nsvci) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 944 | { |
| 945 | struct gprs_nsvc *nsvc; |
| 946 | |
| 947 | nsvc = nsvc_by_rem_addr(nsi, dest); |
Harald Welte | 517b77f | 2010-05-12 11:56:39 +0000 | [diff] [blame] | 948 | if (!nsvc) |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 949 | nsvc = nsvc_create(nsi, nsvci); |
Harald Welte | 517b77f | 2010-05-12 11:56:39 +0000 | [diff] [blame] | 950 | nsvc->ip.bts_addr = *dest; |
Harald Welte | 323e4f6 | 2010-05-01 11:28:43 +0200 | [diff] [blame] | 951 | nsvc->nsei = nsei; |
| 952 | nsvc->nsvci = nsvci; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 953 | nsvc->remote_end_is_sgsn = 1; |
| 954 | |
Holger Hans Peter Freyther | 956e2b0 | 2010-05-23 21:18:01 +0800 | [diff] [blame^] | 955 | gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION); |
| 956 | return nsvc; |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 957 | } |