Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 1 | /* GPRS BSSGP protocol implementation as per 3GPP TS 08.18 */ |
| 2 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 3 | /* (C) 2009-2010 by Harald Welte <laforge@gnumonks.org> |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 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 <errno.h> |
| 24 | #include <sys/types.h> |
| 25 | |
| 26 | #include <netinet/in.h> |
| 27 | |
| 28 | #include <osmocore/msgb.h> |
| 29 | #include <osmocore/tlv.h> |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 30 | #include <osmocore/talloc.h> |
| 31 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 32 | #include <openbsc/debug.h> |
| 33 | #include <openbsc/gsm_data.h> |
| 34 | #include <openbsc/gsm_04_08_gprs.h> |
| 35 | #include <openbsc/gprs_bssgp.h> |
| 36 | #include <openbsc/gprs_llc.h> |
| 37 | #include <openbsc/gprs_ns.h> |
| 38 | |
| 39 | /* global pointer to the gsm network data structure */ |
| 40 | /* FIXME: this must go! */ |
| 41 | extern struct gsm_network *bsc_gsmnet; |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 42 | struct gprs_ns_inst *bssgp_nsi; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 43 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 44 | void *bssgp_tall_ctx = NULL; |
| 45 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 46 | /* Chapter 11.3.9 / Table 11.10: Cause coding */ |
| 47 | static const char *bssgp_cause_strings[] = { |
| 48 | [BSSGP_CAUSE_PROC_OVERLOAD] = "Processor overload", |
| 49 | [BSSGP_CAUSE_EQUIP_FAIL] = "Equipment Failure", |
| 50 | [BSSGP_CAUSE_TRASIT_NET_FAIL] = "Transit netowkr service failure", |
| 51 | [BSSGP_CAUSE_CAPA_GREATER_0KPBS]= "Transmission capacity modified", |
| 52 | [BSSGP_CAUSE_UNKNOWN_MS] = "Unknown MS", |
| 53 | [BSSGP_CAUSE_UNKNOWN_BVCI] = "Unknown BVCI", |
| 54 | [BSSGP_CAUSE_CELL_TRAF_CONG] = "Cell traffic congestion", |
| 55 | [BSSGP_CAUSE_SGSN_CONG] = "SGSN congestion", |
| 56 | [BSSGP_CAUSE_OML_INTERV] = "O&M intervention", |
| 57 | [BSSGP_CAUSE_BVCI_BLOCKED] = "BVCI blocked", |
| 58 | [BSSGP_CAUSE_PFC_CREATE_FAIL] = "PFC create failure", |
| 59 | [BSSGP_CAUSE_SEM_INCORR_PDU] = "Semantically incorrect PDU", |
| 60 | [BSSGP_CAUSE_INV_MAND_INF] = "Invalid mandatory information", |
| 61 | [BSSGP_CAUSE_MISSING_MAND_IE] = "Missing mandatory IE", |
| 62 | [BSSGP_CAUSE_MISSING_COND_IE] = "Missing conditional IE", |
| 63 | [BSSGP_CAUSE_UNEXP_COND_IE] = "Unexpected conditional IE", |
| 64 | [BSSGP_CAUSE_COND_IE_ERR] = "Conditional IE error", |
| 65 | [BSSGP_CAUSE_PDU_INCOMP_STATE] = "PDU incompatible with protocol state", |
| 66 | [BSSGP_CAUSE_PROTO_ERR_UNSPEC] = "Protocol error - unspecified", |
| 67 | [BSSGP_CAUSE_PDU_INCOMP_FEAT] = "PDU not compatible with feature set", |
| 68 | }; |
| 69 | |
| 70 | static const char *bssgp_cause_str(enum gprs_bssgp_cause cause) |
| 71 | { |
| 72 | if (cause >= ARRAY_SIZE(bssgp_cause_strings)) |
| 73 | return "undefined"; |
| 74 | |
| 75 | if (bssgp_cause_strings[cause]) |
| 76 | return bssgp_cause_strings[cause]; |
| 77 | |
| 78 | return "undefined"; |
| 79 | } |
| 80 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 81 | #define BVC_F_BLOCKED 0x0001 |
| 82 | |
| 83 | /* The per-BTS context that we keep on the SGSN side of the BSSGP link */ |
| 84 | struct bssgp_bts_ctx { |
| 85 | struct llist_head list; |
| 86 | |
| 87 | /* parsed RA ID and Cell ID of the remote BTS */ |
| 88 | struct gprs_ra_id ra_id; |
| 89 | uint16_t cell_id; |
| 90 | |
| 91 | /* NSEI and BVCI of underlying Gb link. Together they |
| 92 | * uniquely identify a link to a BTS (5.4.4) */ |
| 93 | uint16_t bvci; |
| 94 | uint16_t nsei; |
| 95 | |
| 96 | uint32_t bvc_state; |
| 97 | |
| 98 | /* we might want to add this as a shortcut later, avoiding the NSVC |
| 99 | * lookup for every packet, similar to a routing cache */ |
| 100 | //struct gprs_nsvc *nsvc; |
| 101 | }; |
| 102 | LLIST_HEAD(bts_ctxts); |
| 103 | |
| 104 | /* Find a BTS Context based on parsed RA ID and Cell ID */ |
| 105 | struct bssgp_bts_ctx *btsctx_by_raid_cid(const struct gprs_ra_id *raid, uint16_t cid) |
| 106 | { |
| 107 | struct bssgp_bts_ctx *bctx; |
| 108 | |
| 109 | llist_for_each_entry(bctx, &bts_ctxts, list) { |
| 110 | if (!memcmp(&bctx->ra_id, raid, sizeof(bctx->ra_id)) && |
| 111 | bctx->cell_id == cid) |
| 112 | return bctx; |
| 113 | } |
| 114 | return NULL; |
| 115 | } |
| 116 | |
| 117 | /* Find a BTS context based on BVCI+NSEI tuple */ |
| 118 | struct bssgp_bts_ctx *btsctx_by_bvci_nsei(uint16_t bvci, uint16_t nsei) |
| 119 | { |
| 120 | struct bssgp_bts_ctx *bctx; |
| 121 | |
| 122 | llist_for_each_entry(bctx, &bts_ctxts, list) { |
| 123 | if (bctx->nsei == nsei && bctx->bvci == bvci) |
| 124 | return bctx; |
| 125 | } |
| 126 | return NULL; |
| 127 | } |
| 128 | |
| 129 | struct bssgp_btx_ctx *btsctx_alloc(uint16_t bvci, uint16_t nsei) |
| 130 | { |
| 131 | struct bssgp_bts_ctx *ctx; |
| 132 | |
| 133 | ctx = talloc_zero(bssgp_tall_ctx, struct bssgp_bts_ctx); |
| 134 | if (!ctx) |
| 135 | return NULL; |
| 136 | ctx->bvci = bvci; |
| 137 | ctx->nsei = nsei; |
| 138 | llist_add(&ctx->list, &bts_ctxts); |
| 139 | |
| 140 | return ctx; |
| 141 | } |
| 142 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 143 | static inline struct msgb *bssgp_msgb_alloc(void) |
| 144 | { |
| 145 | return msgb_alloc_headroom(4096, 128, "BSSGP"); |
| 146 | } |
| 147 | |
| 148 | /* Transmit a simple response such as BLOCK/UNBLOCK/RESET ACK/NACK */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 149 | static int bssgp_tx_simple_bvci(u_int8_t pdu_type, u_int16_t nsei, |
| 150 | u_int16_t bvci, u_int16_t ns_bvci) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 151 | { |
| 152 | struct msgb *msg = bssgp_msgb_alloc(); |
| 153 | struct bssgp_normal_hdr *bgph = |
| 154 | (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); |
| 155 | u_int16_t _bvci; |
| 156 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 157 | msgb_nsei(msg) = nsei; |
| 158 | msgb_bvci(msg) = ns_bvci; |
| 159 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 160 | bgph->pdu_type = pdu_type; |
| 161 | _bvci = htons(bvci); |
| 162 | msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (u_int8_t *) &_bvci); |
| 163 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 164 | return gprs_ns_sendmsg(bssgp_nsi, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /* Chapter 10.4.5: Flow Control BVC ACK */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 168 | static int bssgp_tx_fc_bvc_ack(u_int16_t nsei, u_int8_t tag, u_int16_t ns_bvci) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 169 | { |
| 170 | struct msgb *msg = bssgp_msgb_alloc(); |
| 171 | struct bssgp_normal_hdr *bgph = |
| 172 | (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); |
| 173 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 174 | msgb_nsei(msg) = nsei; |
| 175 | msgb_bvci(msg) = ns_bvci; |
| 176 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 177 | bgph->pdu_type = BSSGP_PDUT_FLOW_CONTROL_BVC_ACK; |
| 178 | msgb_tvlv_put(msg, BSSGP_IE_TAG, 1, &tag); |
| 179 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 180 | return gprs_ns_sendmsg(bssgp_nsi, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | /* Chapter 10.4.14: Status */ |
Harald Welte | d1991e7 | 2010-04-30 20:26:32 +0200 | [diff] [blame] | 184 | int bssgp_tx_status(u_int8_t cause, u_int16_t *bvci, struct msgb *orig_msg) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 185 | { |
| 186 | struct msgb *msg = bssgp_msgb_alloc(); |
| 187 | struct bssgp_normal_hdr *bgph = |
| 188 | (struct bssgp_normal_hdr *) msgb_put(msg, sizeof(*bgph)); |
| 189 | |
| 190 | DEBUGPC(DGPRS, "BSSGP: TX STATUS, cause=%s\n", bssgp_cause_str(cause)); |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 191 | msgb_nsei(msg) = msgb_nsei(orig_msg); |
| 192 | msgb_bvci(msg) = 0; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 193 | |
| 194 | bgph->pdu_type = BSSGP_PDUT_STATUS; |
| 195 | msgb_tvlv_put(msg, BSSGP_IE_CAUSE, 1, &cause); |
| 196 | if (bvci) { |
| 197 | u_int16_t _bvci = htons(*bvci); |
| 198 | msgb_tvlv_put(msg, BSSGP_IE_BVCI, 2, (u_int8_t *) &_bvci); |
| 199 | } |
| 200 | if (orig_msg) |
| 201 | msgb_tvlv_put(msg, BSSGP_IE_PDU_IN_ERROR, |
| 202 | msgb_l3len(orig_msg), orig_msg->l3h); |
| 203 | |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 204 | return gprs_ns_sendmsg(bssgp_nsi, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 205 | } |
| 206 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 207 | static void bssgp_parse_cell_id(struct gprs_ra_id *raid, uint16_t *cid, |
| 208 | const uint8_t *buf) |
| 209 | { |
| 210 | /* 6 octets RAC */ |
| 211 | gsm48_parse_ra(raid, buf); |
| 212 | /* 2 octets CID */ |
| 213 | *cid = ntohs(*(uint16_t *) (buf+6)); |
| 214 | } |
| 215 | |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 216 | /* Chapter 8.4 BVC-Reset Procedure */ |
| 217 | static int bssgp_rx_bvc_reset(struct msgb *msg, struct tlv_parsed *tp, |
| 218 | uint16_t ns_bvci) |
| 219 | { |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 220 | struct bssgp_bts_ctx *bctx; |
| 221 | uint16_t nsei = msgb_nsei(msg); |
| 222 | uint16_t bvci; |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 223 | int rc; |
| 224 | |
| 225 | bvci = ntohs(*(u_int16_t *)TLVP_VAL(tp, BSSGP_IE_BVCI)); |
| 226 | DEBUGPC(DGPRS, "BVCI=%u, cause=%s\n", bvci, |
| 227 | bssgp_cause_str(*TLVP_VAL(tp, BSSGP_IE_CAUSE))); |
| 228 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 229 | /* look-up or create the BTS context for this BVC */ |
| 230 | bctx = btsctx_by_bvci_nsei(bvci, nsei); |
| 231 | if (!bctx) |
| 232 | bctx = btsctx_alloc(bvci, nsei); |
| 233 | |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 234 | /* When we receive a BVC-RESET PDU (at least of a PTP BVCI), the BSS |
| 235 | * informs us about its RAC + Cell ID, so we can create a mapping */ |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 236 | if (bvci != 0 && bvci != 1) { |
| 237 | if (!TLVP_PRESENT(tp, BSSGP_IE_CELL_ID)) { |
| 238 | LOGP(DGPRS, LOGL_ERROR, "BSSGP RESET BVCI=%u " |
| 239 | "missing mandatory IE\n", bvci); |
| 240 | return -EINVAL; |
| 241 | } |
| 242 | /* actually extract RAC / CID */ |
| 243 | bssgp_parse_cell_id(&bctx->ra_id, &bctx->cell_id, |
| 244 | TLVP_VAL(tp, BSSGP_IE_CELL_ID)); |
| 245 | LOGP(DGPRS, LOGL_NOTICE, "Cell %u-%u-%u-%u CI %u on BVCI %u\n", |
| 246 | bctx->ra_id.mcc, bctx->ra_id.mnc, bctx->ra_id.lac, |
| 247 | bctx->ra_id.rac, bctx->cell_id, bvci); |
| 248 | } |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 249 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 250 | /* Acknowledge the RESET to the BTS */ |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 251 | rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_RESET_ACK, |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 252 | nsei, bvci, ns_bvci); |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 253 | return 0; |
| 254 | } |
| 255 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 256 | /* Uplink unit-data */ |
| 257 | static int bssgp_rx_ul_ud(struct msgb *msg, u_int16_t bvci) |
| 258 | { |
| 259 | struct bssgp_ud_hdr *budh = (struct bssgp_ud_hdr *) msg->l3h; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 260 | int data_len = msgb_l3len(msg) - sizeof(*budh); |
| 261 | struct tlv_parsed tp; |
| 262 | int rc; |
| 263 | |
| 264 | DEBUGP(DGPRS, "BSSGP UL-UD\n"); |
| 265 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 266 | /* extract TLLI and parse TLV IEs */ |
Harald Welte | cf3c414 | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 267 | msgb_tlli(msg) = ntohl(budh->tlli); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 268 | rc = bssgp_tlv_parse(&tp, budh->data, data_len); |
| 269 | |
| 270 | /* Cell ID and LLC_PDU are the only mandatory IE */ |
| 271 | if (!TLVP_PRESENT(&tp, BSSGP_IE_CELL_ID) || |
| 272 | !TLVP_PRESENT(&tp, BSSGP_IE_LLC_PDU)) |
| 273 | return -EIO; |
| 274 | |
Harald Welte | cf3c414 | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 275 | msgb_llch(msg) = TLVP_VAL(&tp, BSSGP_IE_LLC_PDU); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 276 | |
| 277 | return gprs_llc_rcvmsg(msg, &tp); |
| 278 | } |
| 279 | |
| 280 | static int bssgp_rx_suspend(struct msgb *msg, u_int16_t bvci) |
| 281 | { |
| 282 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h; |
| 283 | int data_len = msgb_l3len(msg) - sizeof(*bgph); |
| 284 | struct tlv_parsed tp; |
| 285 | int rc; |
| 286 | |
| 287 | DEBUGP(DGPRS, "BSSGP SUSPEND\n"); |
| 288 | |
| 289 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 290 | if (rc < 0) |
| 291 | return rc; |
| 292 | |
| 293 | if (!TLVP_PRESENT(&tp, BSSGP_IE_TLLI) || |
| 294 | !TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA)) |
| 295 | return -EIO; |
| 296 | |
| 297 | /* SEND SUSPEND_ACK or SUSPEND_NACK */ |
| 298 | /* FIXME */ |
| 299 | } |
| 300 | |
| 301 | static int bssgp_rx_resume(struct msgb *msg, u_int16_t bvci) |
| 302 | { |
| 303 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h; |
| 304 | int data_len = msgb_l3len(msg) - sizeof(*bgph); |
| 305 | struct tlv_parsed tp; |
| 306 | int rc; |
| 307 | |
| 308 | DEBUGP(DGPRS, "BSSGP RESUME\n"); |
| 309 | |
| 310 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 311 | if (rc < 0) |
| 312 | return rc; |
| 313 | |
| 314 | if (!TLVP_PRESENT(&tp, BSSGP_IE_TLLI) || |
| 315 | !TLVP_PRESENT(&tp, BSSGP_IE_ROUTEING_AREA) || |
| 316 | !TLVP_PRESENT(&tp, BSSGP_IE_SUSPEND_REF_NR)) |
| 317 | return -EIO; |
| 318 | |
| 319 | /* SEND RESUME_ACK or RESUME_NACK */ |
| 320 | /* FIXME */ |
| 321 | } |
| 322 | |
| 323 | static int bssgp_rx_fc_bvc(struct msgb *msg, struct tlv_parsed *tp, |
| 324 | u_int16_t ns_bvci) |
| 325 | { |
| 326 | |
| 327 | DEBUGP(DGPRS, "BSSGP FC BVC\n"); |
| 328 | |
| 329 | if (!TLVP_PRESENT(tp, BSSGP_IE_TAG) || |
| 330 | !TLVP_PRESENT(tp, BSSGP_IE_BVC_BUCKET_SIZE) || |
| 331 | !TLVP_PRESENT(tp, BSSGP_IE_BUCKET_LEAK_RATE) || |
| 332 | !TLVP_PRESENT(tp, BSSGP_IE_BMAX_DEFAULT_MS) || |
| 333 | !TLVP_PRESENT(tp, BSSGP_IE_R_DEFAULT_MS)) |
| 334 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| 335 | |
| 336 | /* Send FLOW_CONTROL_BVC_ACK */ |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 337 | return bssgp_tx_fc_bvc_ack(msgb_nsei(msg), *TLVP_VAL(tp, BSSGP_IE_TAG), |
| 338 | ns_bvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 339 | } |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 340 | |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 341 | /* We expect msg->l3h to point to the BSSGP header */ |
| 342 | int gprs_bssgp_rcvmsg(struct msgb *msg, u_int16_t ns_bvci) |
| 343 | { |
| 344 | struct bssgp_normal_hdr *bgph = (struct bssgp_normal_hdr *) msg->l3h; |
| 345 | struct tlv_parsed tp; |
| 346 | u_int8_t pdu_type = bgph->pdu_type; |
| 347 | int data_len = msgb_l3len(msg) - sizeof(*bgph); |
| 348 | u_int16_t bvci; |
| 349 | int rc = 0; |
| 350 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 351 | /* UNITDATA BSSGP headers have TLLI in front */ |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 352 | if (pdu_type != BSSGP_PDUT_UL_UNITDATA && |
| 353 | pdu_type != BSSGP_PDUT_DL_UNITDATA) |
| 354 | rc = bssgp_tlv_parse(&tp, bgph->data, data_len); |
| 355 | |
| 356 | switch (pdu_type) { |
| 357 | case BSSGP_PDUT_UL_UNITDATA: |
| 358 | /* some LLC data from the MS */ |
| 359 | rc = bssgp_rx_ul_ud(msg, ns_bvci); |
| 360 | break; |
| 361 | case BSSGP_PDUT_RA_CAPABILITY: |
| 362 | /* BSS requests RA capability or IMSI */ |
| 363 | DEBUGP(DGPRS, "BSSGP RA CAPABILITY UPDATE\n"); |
| 364 | /* FIXME: send RA_CAPA_UPDATE_ACK */ |
| 365 | break; |
| 366 | case BSSGP_PDUT_RADIO_STATUS: |
| 367 | DEBUGP(DGPRS, "BSSGP RADIO STATUS\n"); |
| 368 | /* BSS informs us of some exception */ |
| 369 | break; |
| 370 | case BSSGP_PDUT_SUSPEND: |
| 371 | /* MS wants to suspend */ |
| 372 | rc = bssgp_rx_suspend(msg, ns_bvci); |
| 373 | break; |
| 374 | case BSSGP_PDUT_RESUME: |
| 375 | /* MS wants to resume */ |
| 376 | rc = bssgp_rx_resume(msg, ns_bvci); |
| 377 | break; |
| 378 | case BSSGP_PDUT_FLUSH_LL: |
| 379 | /* BSS informs MS has moved to one cell to other cell */ |
| 380 | DEBUGP(DGPRS, "BSSGP FLUSH LL\n"); |
| 381 | /* Send FLUSH_LL_ACK */ |
| 382 | break; |
| 383 | case BSSGP_PDUT_LLC_DISCARD: |
| 384 | /* BSS informs that some LLC PDU's have been discarded */ |
| 385 | DEBUGP(DGPRS, "BSSGP LLC DISCARDED\n"); |
| 386 | break; |
| 387 | case BSSGP_PDUT_FLOW_CONTROL_BVC: |
| 388 | /* BSS informs us of available bandwidth in Gb interface */ |
| 389 | rc = bssgp_rx_fc_bvc(msg, &tp, ns_bvci); |
| 390 | break; |
| 391 | case BSSGP_PDUT_FLOW_CONTROL_MS: |
| 392 | /* BSS informs us of available bandwidth to one MS */ |
| 393 | DEBUGP(DGPRS, "BSSGP FC MS\n"); |
| 394 | /* Send FLOW_CONTROL_MS_ACK */ |
| 395 | break; |
| 396 | case BSSGP_PDUT_BVC_BLOCK: |
| 397 | /* BSS tells us that BVC shall be blocked */ |
| 398 | DEBUGP(DGPRS, "BSSGP BVC BLOCK "); |
| 399 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI) || |
| 400 | !TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) |
| 401 | goto err_mand_ie; |
| 402 | bvci = ntohs(*(u_int16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI)); |
| 403 | DEBUGPC(DGPRS, "BVCI=%u, cause=%s\n", bvci, |
| 404 | bssgp_cause_str(*TLVP_VAL(&tp, BSSGP_IE_CAUSE))); |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 405 | /* We always acknowledge the BLOCKing */ |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 406 | rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_BLOCK_ACK, |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 407 | msgb_nsei(msg), bvci, ns_bvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 408 | break; |
| 409 | case BSSGP_PDUT_BVC_UNBLOCK: |
| 410 | /* BSS tells us that BVC shall be unblocked */ |
| 411 | DEBUGP(DGPRS, "BSSGP BVC UNBLOCK "); |
| 412 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI)) |
| 413 | goto err_mand_ie; |
| 414 | bvci = ntohs(*(u_int16_t *)TLVP_VAL(&tp, BSSGP_IE_BVCI)); |
| 415 | DEBUGPC(DGPRS, "BVCI=%u\n", bvci); |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 416 | /* We always acknowledge the unBLOCKing */ |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 417 | rc = bssgp_tx_simple_bvci(BSSGP_PDUT_BVC_UNBLOCK_ACK, |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 418 | msgb_nsei(msg), bvci, ns_bvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 419 | break; |
| 420 | case BSSGP_PDUT_BVC_RESET: |
| 421 | /* BSS tells us that BVC init is required */ |
| 422 | DEBUGP(DGPRS, "BSSGP BVC RESET "); |
| 423 | if (!TLVP_PRESENT(&tp, BSSGP_IE_BVCI) || |
| 424 | !TLVP_PRESENT(&tp, BSSGP_IE_CAUSE)) |
| 425 | goto err_mand_ie; |
Harald Welte | 55fe055 | 2010-05-01 16:48:27 +0200 | [diff] [blame] | 426 | rc = bssgp_rx_bvc_reset(msg, &tp, ns_bvci); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 427 | break; |
| 428 | case BSSGP_PDUT_STATUS: |
| 429 | /* Some exception has occurred */ |
| 430 | case BSSGP_PDUT_DOWNLOAD_BSS_PFC: |
| 431 | case BSSGP_PDUT_CREATE_BSS_PFC_ACK: |
| 432 | case BSSGP_PDUT_CREATE_BSS_PFC_NACK: |
| 433 | case BSSGP_PDUT_MODIFY_BSS_PFC: |
| 434 | case BSSGP_PDUT_DELETE_BSS_PFC_ACK: |
| 435 | DEBUGP(DGPRS, "BSSGP PDU type 0x%02x not [yet] implemented\n", |
| 436 | pdu_type); |
| 437 | break; |
| 438 | /* those only exist in the SGSN -> BSS direction */ |
| 439 | case BSSGP_PDUT_DL_UNITDATA: |
| 440 | case BSSGP_PDUT_PAGING_PS: |
| 441 | case BSSGP_PDUT_PAGING_CS: |
| 442 | case BSSGP_PDUT_RA_CAPA_UPDATE_ACK: |
| 443 | case BSSGP_PDUT_SUSPEND_ACK: |
| 444 | case BSSGP_PDUT_SUSPEND_NACK: |
| 445 | case BSSGP_PDUT_RESUME_ACK: |
| 446 | case BSSGP_PDUT_RESUME_NACK: |
| 447 | case BSSGP_PDUT_FLUSH_LL_ACK: |
| 448 | case BSSGP_PDUT_FLOW_CONTROL_BVC_ACK: |
| 449 | case BSSGP_PDUT_FLOW_CONTROL_MS_ACK: |
| 450 | case BSSGP_PDUT_BVC_BLOCK_ACK: |
| 451 | case BSSGP_PDUT_BVC_UNBLOCK_ACK: |
| 452 | case BSSGP_PDUT_SGSN_INVOKE_TRACE: |
| 453 | DEBUGP(DGPRS, "BSSGP PDU type 0x%02x only exists in DL\n", |
| 454 | pdu_type); |
| 455 | rc = -EINVAL; |
| 456 | break; |
| 457 | default: |
| 458 | DEBUGP(DGPRS, "BSSGP PDU type 0x%02x unknown\n", pdu_type); |
| 459 | break; |
| 460 | } |
| 461 | |
| 462 | return rc; |
| 463 | err_mand_ie: |
| 464 | return bssgp_tx_status(BSSGP_CAUSE_MISSING_MAND_IE, NULL, msg); |
| 465 | } |
| 466 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 467 | /* Entry function from upper level (LLC), asking us to transmit a BSSGP PDU |
| 468 | * to a remote MS (identified by TLLI) at a BTS identified by its RAC and CID */ |
| 469 | int gprs_bssgp_tx_dl_ud(struct msgb *msg, const struct gprs_ra_id *raid, uint16_t cid) |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 470 | { |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 471 | struct bssgp_bts_ctx *bctx; |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 472 | struct bssgp_ud_hdr *budh; |
| 473 | u_int8_t llc_pdu_tlv_hdr_len = 2; |
| 474 | u_int8_t *llc_pdu_tlv, *qos_profile; |
| 475 | u_int16_t pdu_lifetime = 1000; /* centi-seconds */ |
| 476 | u_int8_t qos_profile_default[3] = { 0x00, 0x00, 0x21 }; |
| 477 | u_int16_t msg_len = msg->len; |
| 478 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 479 | bctx = btsctx_by_raid_cid(raid, cid); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 480 | |
| 481 | if (msg->len > TVLV_MAX_ONEBYTE) |
| 482 | llc_pdu_tlv_hdr_len += 1; |
| 483 | |
| 484 | /* prepend the tag and length of the LLC-PDU TLV */ |
| 485 | llc_pdu_tlv = msgb_push(msg, llc_pdu_tlv_hdr_len); |
| 486 | llc_pdu_tlv[0] = BSSGP_IE_LLC_PDU; |
| 487 | if (llc_pdu_tlv_hdr_len > 2) { |
| 488 | llc_pdu_tlv[1] = msg_len >> 8; |
| 489 | llc_pdu_tlv[2] = msg_len & 0xff; |
| 490 | } else { |
| 491 | llc_pdu_tlv[1] = msg_len & 0x3f; |
| 492 | llc_pdu_tlv[1] |= 0x80; |
| 493 | } |
| 494 | |
| 495 | /* FIXME: optional elements */ |
| 496 | |
| 497 | /* prepend the pdu lifetime */ |
| 498 | pdu_lifetime = htons(pdu_lifetime); |
| 499 | msgb_tvlv_push(msg, BSSGP_IE_PDU_LIFETIME, 2, (u_int8_t *)&pdu_lifetime); |
| 500 | |
| 501 | /* prepend the QoS profile, TLLI and pdu type */ |
| 502 | budh = (struct bssgp_ud_hdr *) msgb_push(msg, sizeof(*budh)); |
| 503 | memcpy(budh->qos_profile, qos_profile_default, sizeof(qos_profile_default)); |
Harald Welte | cf3c414 | 2010-04-30 16:33:12 +0200 | [diff] [blame] | 504 | budh->tlli = htonl(msgb_tlli(msg)); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 505 | budh->pdu_type = BSSGP_PDUT_DL_UNITDATA; |
| 506 | |
Harald Welte | f897265 | 2010-05-02 09:23:16 +0200 | [diff] [blame^] | 507 | msgb_nsei(msg) = bctx->nsei; |
| 508 | msgb_bvci(msg) = bctx->bvci; |
Harald Welte | cd788ba | 2010-04-30 19:54:29 +0200 | [diff] [blame] | 509 | |
| 510 | return gprs_ns_sendmsg(bssgp_nsi, msg); |
Harald Welte | 75bb820 | 2010-03-14 15:45:01 +0800 | [diff] [blame] | 511 | } |