Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1 | /* OpenBSC Abis/IP proxy ip.access nanoBTS */ |
| 2 | |
| 3 | /* (C) 2009 by Harald Welte <laforge@gnumonks.org> |
Holger Hans Peter Freyther | 5180844 | 2010-10-06 20:37:09 +0800 | [diff] [blame] | 4 | * (C) 2010 by On-Waves |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 5 | * (C) 2010 by Holger Hans Peter Freyther <zecke@selfish.org> |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 6 | * |
| 7 | * All Rights Reserved |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 10 | * it under the terms of the GNU Affero General Public License as published by |
| 11 | * the Free Software Foundation; either version 3 of the License, or |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 17 | * GNU Affero General Public License for more details. |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 18 | * |
Harald Welte | 0e3e88e | 2011-01-01 15:25:50 +0100 | [diff] [blame] | 19 | * You should have received a copy of the GNU Affero General Public License |
| 20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <stdio.h> |
| 25 | #include <unistd.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <errno.h> |
| 28 | #include <string.h> |
| 29 | #include <signal.h> |
| 30 | #include <time.h> |
| 31 | #include <sys/fcntl.h> |
| 32 | #include <sys/types.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <sys/ioctl.h> |
| 35 | #include <arpa/inet.h> |
| 36 | #include <netinet/in.h> |
| 37 | |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 38 | #define _GNU_SOURCE |
| 39 | #include <getopt.h> |
| 40 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 41 | #include <openbsc/gsm_data.h> |
Pablo Neira Ayuso | dd5fff4 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 42 | #include <osmocom/core/select.h> |
| 43 | #include <osmocom/gsm/tlv.h> |
| 44 | #include <osmocom/core/msgb.h> |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 45 | #include <openbsc/debug.h> |
| 46 | #include <openbsc/ipaccess.h> |
Pablo Neira Ayuso | a8bebcf | 2011-04-05 18:33:28 +0200 | [diff] [blame] | 47 | #include <openbsc/socket.h> |
Pablo Neira Ayuso | dd5fff4 | 2011-03-22 16:47:59 +0100 | [diff] [blame] | 48 | #include <osmocom/core/talloc.h> |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 49 | |
Harald Welte | 51d2a59 | 2010-03-26 21:28:59 +0800 | [diff] [blame] | 50 | static struct log_target *stderr_target; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 51 | |
| 52 | /* one instance of an ip.access protocol proxy */ |
| 53 | struct ipa_proxy { |
| 54 | /* socket where we listen for incoming OML from BTS */ |
| 55 | struct bsc_fd oml_listen_fd; |
| 56 | /* socket where we listen for incoming RSL from BTS */ |
| 57 | struct bsc_fd rsl_listen_fd; |
| 58 | /* list of BTS's (struct ipa_bts_conn */ |
| 59 | struct llist_head bts_list; |
| 60 | /* the BSC reconnect timer */ |
| 61 | struct timer_list reconn_timer; |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 62 | /* global GPRS NS data */ |
| 63 | struct in_addr gprs_addr; |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 64 | struct in_addr listen_addr; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 65 | }; |
| 66 | |
| 67 | /* global pointer to the proxy structure */ |
| 68 | static struct ipa_proxy *ipp; |
| 69 | |
| 70 | struct ipa_proxy_conn { |
| 71 | struct bsc_fd fd; |
| 72 | struct llist_head tx_queue; |
| 73 | struct ipa_bts_conn *bts_conn; |
| 74 | }; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 75 | #define MAX_TRX 4 |
| 76 | |
| 77 | /* represents a particular BTS in our proxy */ |
| 78 | struct ipa_bts_conn { |
| 79 | /* list of BTS's (ipa_proxy->bts_list) */ |
| 80 | struct llist_head list; |
| 81 | /* back pointer to the proxy which we belong to */ |
| 82 | struct ipa_proxy *ipp; |
| 83 | /* the unit ID as determined by CCM */ |
| 84 | struct { |
| 85 | u_int16_t site_id; |
| 86 | u_int16_t bts_id; |
| 87 | } unit_id; |
| 88 | |
| 89 | /* incoming connections from BTS */ |
| 90 | struct ipa_proxy_conn *oml_conn; |
| 91 | struct ipa_proxy_conn *rsl_conn[MAX_TRX]; |
| 92 | |
| 93 | /* outgoing connections to BSC */ |
| 94 | struct ipa_proxy_conn *bsc_oml_conn; |
| 95 | struct ipa_proxy_conn *bsc_rsl_conn[MAX_TRX]; |
| 96 | |
| 97 | /* UDP sockets for BTS and BSC injection */ |
| 98 | struct bsc_fd udp_bts_fd; |
| 99 | struct bsc_fd udp_bsc_fd; |
| 100 | |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 101 | /* NS data */ |
| 102 | struct in_addr bts_addr; |
| 103 | struct bsc_fd gprs_ns_fd; |
| 104 | int gprs_local_port; |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 105 | uint16_t gprs_orig_port; |
| 106 | uint32_t gprs_orig_ip; |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 107 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 108 | char *id_tags[0xff]; |
| 109 | u_int8_t *id_resp; |
| 110 | unsigned int id_resp_len; |
| 111 | }; |
| 112 | |
| 113 | enum ipp_fd_type { |
| 114 | OML_FROM_BTS = 1, |
| 115 | RSL_FROM_BTS = 2, |
| 116 | OML_TO_BSC = 3, |
| 117 | RSL_TO_BSC = 4, |
| 118 | UDP_TO_BTS = 5, |
| 119 | UDP_TO_BSC = 6, |
| 120 | }; |
| 121 | |
| 122 | /* some of the code against we link from OpenBSC needs this */ |
| 123 | void *tall_bsc_ctx; |
| 124 | |
| 125 | static char *listen_ipaddr; |
| 126 | static char *bsc_ipaddr; |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 127 | static char *gprs_ns_ipaddr; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 128 | |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 129 | static int make_gprs_sock(struct bsc_fd *bfd, int (*cb)(struct bsc_fd*,unsigned int), void *); |
| 130 | static int gprs_ns_cb(struct bsc_fd *bfd, unsigned int what); |
| 131 | |
Holger Hans Peter Freyther | d92d196 | 2010-06-09 14:39:22 +0800 | [diff] [blame] | 132 | #define PROXY_ALLOC_SIZE 1200 |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 133 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 134 | static struct ipa_bts_conn *find_bts_by_unitid(struct ipa_proxy *ipp, |
| 135 | u_int16_t site_id, |
| 136 | u_int16_t bts_id) |
| 137 | { |
| 138 | struct ipa_bts_conn *ipbc; |
| 139 | |
| 140 | llist_for_each_entry(ipbc, &ipp->bts_list, list) { |
| 141 | if (ipbc->unit_id.site_id == site_id && |
| 142 | ipbc->unit_id.bts_id == bts_id) |
| 143 | return ipbc; |
| 144 | } |
| 145 | |
| 146 | return NULL; |
| 147 | } |
| 148 | |
| 149 | struct ipa_proxy_conn *alloc_conn(void) |
| 150 | { |
| 151 | struct ipa_proxy_conn *ipc; |
| 152 | |
| 153 | ipc = talloc_zero(tall_bsc_ctx, struct ipa_proxy_conn); |
| 154 | if (!ipc) |
| 155 | return NULL; |
| 156 | |
| 157 | INIT_LLIST_HEAD(&ipc->tx_queue); |
| 158 | |
| 159 | return ipc; |
| 160 | } |
| 161 | |
| 162 | static int store_idtags(struct ipa_bts_conn *ipbc, struct tlv_parsed *tlvp) |
| 163 | { |
| 164 | unsigned int i, len; |
| 165 | |
| 166 | for (i = 0; i <= 0xff; i++) { |
| 167 | if (!TLVP_PRESENT(tlvp, i)) |
| 168 | continue; |
| 169 | |
| 170 | len = TLVP_LEN(tlvp, i); |
| 171 | #if 0 |
| 172 | if (!ipbc->id_tags[i]) |
| 173 | ipbc->id_tags[i] = talloc_size(tall_bsc_ctx, len); |
| 174 | else |
| 175 | #endif |
Harald Welte | 7bc08d3 | 2009-12-23 23:35:51 +0100 | [diff] [blame] | 176 | ipbc->id_tags[i] = talloc_realloc_size(ipbc, |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 177 | ipbc->id_tags[i], len); |
| 178 | if (!ipbc->id_tags[i]) |
| 179 | return -ENOMEM; |
| 180 | |
| 181 | memset(ipbc->id_tags[i], 0, len); |
| 182 | //memcpy(ipbc->id_tags[i], TLVP_VAL(tlvp, i), len); |
| 183 | } |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | |
| 188 | static struct ipa_proxy_conn *connect_bsc(struct sockaddr_in *sa, int priv_nr, void *data); |
| 189 | |
| 190 | #define logp_ipbc_uid(ss, lvl, ipbc, trx_id) _logp_ipbc_uid(ss, lvl, __FILE__, __LINE__, ipbc, trx_id) |
| 191 | |
| 192 | static void _logp_ipbc_uid(unsigned int ss, unsigned int lvl, char *file, int line, |
| 193 | struct ipa_bts_conn *ipbc, u_int8_t trx_id) |
| 194 | { |
| 195 | if (ipbc) |
Harald Welte | 51d2a59 | 2010-03-26 21:28:59 +0800 | [diff] [blame] | 196 | logp2(ss, lvl, file, line, 0, "(%u/%u/%u) ", ipbc->unit_id.site_id, |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 197 | ipbc->unit_id.bts_id, trx_id); |
| 198 | else |
Harald Welte | 51d2a59 | 2010-03-26 21:28:59 +0800 | [diff] [blame] | 199 | logp2(ss, lvl, file, line, 0, "unknown "); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 200 | } |
| 201 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 202 | static int handle_udp_read(struct bsc_fd *bfd) |
| 203 | { |
| 204 | struct ipa_bts_conn *ipbc = bfd->data; |
| 205 | struct ipa_proxy_conn *other_conn = NULL; |
| 206 | struct msgb *msg = msgb_alloc(PROXY_ALLOC_SIZE, "Abis/IP UDP"); |
| 207 | struct ipaccess_head *hh; |
| 208 | int ret; |
| 209 | |
| 210 | /* with UDP sockets, we cannot read partial packets but have to read |
| 211 | * all of it in one go */ |
| 212 | hh = (struct ipaccess_head *) msg->data; |
| 213 | ret = recv(bfd->fd, msg->data, msg->data_len, 0); |
| 214 | if (ret < 0) { |
Harald Welte | a2be686 | 2009-12-24 13:35:18 +0100 | [diff] [blame] | 215 | if (errno != EAGAIN) |
| 216 | LOGP(DINP, LOGL_ERROR, "recv error %s\n", strerror(errno)); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 217 | msgb_free(msg); |
| 218 | return ret; |
| 219 | } |
| 220 | if (ret == 0) { |
| 221 | DEBUGP(DINP, "UDP peer disappeared, dead socket\n"); |
| 222 | bsc_unregister_fd(bfd); |
| 223 | close(bfd->fd); |
| 224 | bfd->fd = -1; |
| 225 | msgb_free(msg); |
| 226 | return -EIO; |
| 227 | } |
| 228 | if (ret < sizeof(*hh)) { |
| 229 | DEBUGP(DINP, "could not even read header!?!\n"); |
| 230 | msgb_free(msg); |
| 231 | return -EIO; |
| 232 | } |
| 233 | msgb_put(msg, ret); |
| 234 | msg->l2h = msg->data + sizeof(*hh); |
| 235 | DEBUGP(DMI, "UDP RX: %s\n", hexdump(msg->data, msg->len)); |
| 236 | |
| 237 | if (hh->len != msg->len - sizeof(*hh)) { |
| 238 | DEBUGP(DINP, "length (%u/%u) disagrees with header(%u)\n", |
| 239 | msg->len, msg->len - 3, hh->len); |
| 240 | msgb_free(msg); |
| 241 | return -EIO; |
| 242 | } |
| 243 | |
| 244 | switch (bfd->priv_nr & 0xff) { |
| 245 | case UDP_TO_BTS: |
| 246 | /* injection towards BTS */ |
| 247 | switch (hh->proto) { |
| 248 | case IPAC_PROTO_RSL: |
| 249 | /* FIXME: what to do about TRX > 0 */ |
| 250 | other_conn = ipbc->rsl_conn[0]; |
| 251 | break; |
| 252 | default: |
| 253 | DEBUGP(DINP, "Unknown protocol 0x%02x, sending to " |
| 254 | "OML FD\n", hh->proto); |
| 255 | /* fall through */ |
| 256 | case IPAC_PROTO_IPACCESS: |
| 257 | case IPAC_PROTO_OML: |
| 258 | other_conn = ipbc->oml_conn; |
| 259 | break; |
| 260 | } |
| 261 | break; |
| 262 | case UDP_TO_BSC: |
| 263 | /* injection towards BSC */ |
| 264 | switch (hh->proto) { |
| 265 | case IPAC_PROTO_RSL: |
| 266 | /* FIXME: what to do about TRX > 0 */ |
| 267 | other_conn = ipbc->bsc_rsl_conn[0]; |
| 268 | break; |
| 269 | default: |
| 270 | DEBUGP(DINP, "Unknown protocol 0x%02x, sending to " |
| 271 | "OML FD\n", hh->proto); |
| 272 | case IPAC_PROTO_IPACCESS: |
| 273 | case IPAC_PROTO_OML: |
| 274 | other_conn = ipbc->bsc_oml_conn; |
| 275 | break; |
| 276 | } |
| 277 | break; |
| 278 | default: |
| 279 | DEBUGP(DINP, "Unknown filedescriptor priv_nr=%04x\n", bfd->priv_nr); |
| 280 | break; |
| 281 | } |
| 282 | |
| 283 | if (other_conn) { |
| 284 | /* enqueue the message for TX on the respective FD */ |
| 285 | msgb_enqueue(&other_conn->tx_queue, msg); |
| 286 | other_conn->fd.when |= BSC_FD_WRITE; |
| 287 | } else |
| 288 | msgb_free(msg); |
| 289 | |
| 290 | return 0; |
| 291 | } |
| 292 | |
| 293 | static int handle_udp_write(struct bsc_fd *bfd) |
| 294 | { |
| 295 | /* not implemented yet */ |
| 296 | bfd->when &= ~BSC_FD_WRITE; |
| 297 | |
| 298 | return -EIO; |
| 299 | } |
| 300 | |
| 301 | /* callback from select.c in case one of the fd's can be read/written */ |
| 302 | static int udp_fd_cb(struct bsc_fd *bfd, unsigned int what) |
| 303 | { |
| 304 | int rc = 0; |
| 305 | |
| 306 | if (what & BSC_FD_READ) |
| 307 | rc = handle_udp_read(bfd); |
| 308 | if (what & BSC_FD_WRITE) |
| 309 | rc = handle_udp_write(bfd); |
| 310 | |
| 311 | return rc; |
| 312 | } |
| 313 | |
| 314 | |
| 315 | static int ipbc_alloc_connect(struct ipa_proxy_conn *ipc, struct bsc_fd *bfd, |
| 316 | u_int16_t site_id, u_int16_t bts_id, |
| 317 | u_int16_t trx_id, struct tlv_parsed *tlvp, |
| 318 | struct msgb *msg) |
| 319 | { |
| 320 | struct ipa_bts_conn *ipbc; |
| 321 | u_int16_t udp_port; |
| 322 | int ret = 0; |
| 323 | struct sockaddr_in sin; |
| 324 | |
| 325 | memset(&sin, 0, sizeof(sin)); |
| 326 | sin.sin_family = AF_INET; |
| 327 | inet_aton(bsc_ipaddr, &sin.sin_addr); |
| 328 | |
| 329 | DEBUGP(DINP, "(%u/%u/%u) New BTS connection: ", |
| 330 | site_id, bts_id, trx_id); |
| 331 | |
| 332 | /* OML needs to be established before RSL */ |
| 333 | if ((bfd->priv_nr & 0xff) != OML_FROM_BTS) { |
| 334 | DEBUGPC(DINP, "Not a OML connection ?!?\n"); |
| 335 | return -EIO; |
| 336 | } |
| 337 | |
| 338 | /* allocate new BTS connection data structure */ |
| 339 | ipbc = talloc_zero(tall_bsc_ctx, struct ipa_bts_conn); |
| 340 | if (!ipbc) { |
| 341 | ret = -ENOMEM; |
| 342 | goto err_out; |
| 343 | } |
| 344 | |
| 345 | DEBUGPC(DINP, "Created BTS Conn data structure\n"); |
| 346 | ipbc->ipp = ipp; |
| 347 | ipbc->unit_id.site_id = site_id; |
| 348 | ipbc->unit_id.bts_id = bts_id; |
| 349 | ipbc->oml_conn = ipc; |
| 350 | ipc->bts_conn = ipbc; |
| 351 | |
| 352 | /* store the content of the ID TAGS for later reference */ |
| 353 | store_idtags(ipbc, tlvp); |
| 354 | ipbc->id_resp_len = msg->len; |
| 355 | ipbc->id_resp = talloc_size(tall_bsc_ctx, ipbc->id_resp_len); |
| 356 | memcpy(ipbc->id_resp, msg->data, ipbc->id_resp_len); |
| 357 | |
| 358 | /* Create OML TCP connection towards BSC */ |
Harald Welte | 9994b18 | 2009-12-23 22:47:53 +0100 | [diff] [blame] | 359 | sin.sin_port = htons(IPA_TCP_PORT_OML); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 360 | ipbc->bsc_oml_conn = connect_bsc(&sin, OML_TO_BSC, ipbc); |
| 361 | if (!ipbc->bsc_oml_conn) { |
| 362 | ret = -EIO; |
| 363 | goto err_bsc_conn; |
| 364 | } |
| 365 | |
| 366 | DEBUGP(DINP, "(%u/%u/%u) OML Connected to BSC\n", |
| 367 | site_id, bts_id, trx_id); |
| 368 | |
| 369 | /* Create UDP socket for BTS packet injection */ |
| 370 | udp_port = 10000 + (site_id % 1000)*100 + (bts_id % 100); |
Pablo Neira Ayuso | a8bebcf | 2011-04-05 18:33:28 +0200 | [diff] [blame] | 371 | ret = make_sock(&ipbc->udp_bts_fd, IPPROTO_UDP, INADDR_ANY, udp_port, |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 372 | UDP_TO_BTS, udp_fd_cb, ipbc); |
| 373 | if (ret < 0) |
| 374 | goto err_udp_bts; |
| 375 | DEBUGP(DINP, "(%u/%u/%u) Created UDP socket for injection " |
| 376 | "towards BTS at port %u\n", site_id, bts_id, trx_id, udp_port); |
| 377 | |
| 378 | /* Create UDP socket for BSC packet injection */ |
| 379 | udp_port = 20000 + (site_id % 1000)*100 + (bts_id % 100); |
Pablo Neira Ayuso | a8bebcf | 2011-04-05 18:33:28 +0200 | [diff] [blame] | 380 | ret = make_sock(&ipbc->udp_bsc_fd, IPPROTO_UDP, INADDR_ANY, udp_port, |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 381 | UDP_TO_BSC, udp_fd_cb, ipbc); |
| 382 | if (ret < 0) |
| 383 | goto err_udp_bsc; |
| 384 | DEBUGP(DINP, "(%u/%u/%u) Created UDP socket for injection " |
| 385 | "towards BSC at port %u\n", site_id, bts_id, trx_id, udp_port); |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 386 | |
| 387 | |
| 388 | /* GPRS NS related code */ |
| 389 | if (gprs_ns_ipaddr) { |
| 390 | struct sockaddr_in sock; |
| 391 | socklen_t len = sizeof(sock); |
| 392 | ret = make_gprs_sock(&ipbc->gprs_ns_fd, gprs_ns_cb, ipbc); |
| 393 | if (ret < 0) { |
| 394 | LOGP(DINP, LOGL_ERROR, "Creating the GPRS socket failed.\n"); |
| 395 | goto err_udp_bsc; |
| 396 | } |
| 397 | |
| 398 | ret = getsockname(ipbc->gprs_ns_fd.fd, (struct sockaddr* ) &sock, &len); |
| 399 | ipbc->gprs_local_port = ntohs(sock.sin_port); |
| 400 | LOGP(DINP, LOGL_NOTICE, |
| 401 | "Created GPRS NS Socket. Listening on: %s:%d\n", |
| 402 | inet_ntoa(sock.sin_addr), ipbc->gprs_local_port); |
| 403 | |
| 404 | ret = getpeername(bfd->fd, (struct sockaddr* ) &sock, &len); |
| 405 | ipbc->bts_addr = sock.sin_addr; |
| 406 | } |
| 407 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 408 | llist_add(&ipbc->list, &ipp->bts_list); |
| 409 | |
| 410 | return 0; |
| 411 | |
| 412 | err_udp_bsc: |
| 413 | bsc_unregister_fd(&ipbc->udp_bts_fd); |
| 414 | err_udp_bts: |
| 415 | bsc_unregister_fd(&ipbc->bsc_oml_conn->fd); |
| 416 | close(ipbc->bsc_oml_conn->fd.fd); |
| 417 | talloc_free(ipbc->bsc_oml_conn); |
| 418 | ipbc->bsc_oml_conn = NULL; |
| 419 | err_bsc_conn: |
| 420 | talloc_free(ipbc->id_resp); |
| 421 | talloc_free(ipbc); |
| 422 | #if 0 |
| 423 | bsc_unregister_fd(bfd); |
| 424 | close(bfd->fd); |
| 425 | talloc_free(bfd); |
| 426 | #endif |
| 427 | err_out: |
| 428 | return ret; |
| 429 | } |
| 430 | |
| 431 | static int ipaccess_rcvmsg(struct ipa_proxy_conn *ipc, struct msgb *msg, |
| 432 | struct bsc_fd *bfd) |
| 433 | { |
| 434 | struct tlv_parsed tlvp; |
| 435 | u_int8_t msg_type = *(msg->l2h); |
| 436 | u_int16_t site_id, bts_id, trx_id; |
| 437 | struct ipa_bts_conn *ipbc; |
| 438 | int ret = 0; |
| 439 | |
| 440 | switch (msg_type) { |
| 441 | case IPAC_MSGT_PING: |
Pablo Neira Ayuso | b6a229e | 2011-04-07 14:15:06 +0200 | [diff] [blame] | 442 | ret = ipaccess_send_pong(bfd->fd); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 443 | break; |
| 444 | case IPAC_MSGT_PONG: |
| 445 | DEBUGP(DMI, "PONG!\n"); |
| 446 | break; |
| 447 | case IPAC_MSGT_ID_RESP: |
| 448 | DEBUGP(DMI, "ID_RESP "); |
| 449 | /* parse tags, search for Unit ID */ |
Pablo Neira Ayuso | f914f22 | 2011-04-07 14:15:16 +0200 | [diff] [blame] | 450 | ipaccess_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2, |
| 451 | msgb_l2len(msg)-2); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 452 | DEBUGP(DMI, "\n"); |
| 453 | |
| 454 | if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT)) { |
| 455 | LOGP(DINP, LOGL_ERROR, "No Unit ID in ID RESPONSE !?!\n"); |
| 456 | return -EIO; |
| 457 | } |
| 458 | |
| 459 | /* lookup BTS, create sign_link, ... */ |
Holger Hans Peter Freyther | 7dd617a | 2010-03-30 15:20:46 +0200 | [diff] [blame] | 460 | site_id = bts_id = trx_id = 0; |
Pablo Neira Ayuso | b2ed87b | 2011-04-07 14:15:20 +0200 | [diff] [blame^] | 461 | ipaccess_parse_unitid((char *)TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT), |
| 462 | &site_id, &bts_id, &trx_id); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 463 | ipbc = find_bts_by_unitid(ipp, site_id, bts_id); |
| 464 | if (!ipbc) { |
| 465 | /* We have not found an ipbc (per-bts proxy instance) |
| 466 | * for this BTS yet. The first connection of a new BTS must |
| 467 | * be a OML connection. We allocate the associated data structures, |
| 468 | * and try to connect to the remote end */ |
| 469 | |
| 470 | return ipbc_alloc_connect(ipc, bfd, site_id, bts_id, |
| 471 | trx_id, &tlvp, msg); |
| 472 | /* if this fails, the caller will clean up bfd */ |
| 473 | } else { |
| 474 | struct sockaddr_in sin; |
| 475 | memset(&sin, 0, sizeof(sin)); |
| 476 | sin.sin_family = AF_INET; |
| 477 | inet_aton(bsc_ipaddr, &sin.sin_addr); |
| 478 | |
| 479 | DEBUGP(DINP, "Identified BTS %u/%u/%u\n", |
| 480 | site_id, bts_id, trx_id); |
| 481 | |
| 482 | if ((bfd->priv_nr & 0xff) != RSL_FROM_BTS) { |
| 483 | LOGP(DINP, LOGL_ERROR, "Second OML connection from " |
| 484 | "same BTS ?!?\n"); |
| 485 | return 0; |
| 486 | } |
| 487 | |
| 488 | if (trx_id > MAX_TRX) { |
| 489 | LOGP(DINP, LOGL_ERROR, "We don't support more " |
| 490 | "than %u TRX\n", MAX_TRX); |
| 491 | return -EINVAL; |
| 492 | } |
| 493 | |
| 494 | ipc->bts_conn = ipbc; |
| 495 | /* store TRX number in higher 8 bit of the bfd private number */ |
| 496 | bfd->priv_nr |= trx_id << 8; |
| 497 | ipbc->rsl_conn[trx_id] = ipc; |
| 498 | |
| 499 | /* Create RSL TCP connection towards BSC */ |
Harald Welte | 9994b18 | 2009-12-23 22:47:53 +0100 | [diff] [blame] | 500 | sin.sin_port = htons(IPA_TCP_PORT_RSL); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 501 | ipbc->bsc_rsl_conn[trx_id] = |
| 502 | connect_bsc(&sin, RSL_TO_BSC | (trx_id << 8), ipbc); |
| 503 | if (!ipbc->bsc_oml_conn) |
| 504 | return -EIO; |
| 505 | DEBUGP(DINP, "(%u/%u/%u) Connected RSL to BSC\n", |
| 506 | site_id, bts_id, trx_id); |
| 507 | } |
| 508 | break; |
| 509 | case IPAC_MSGT_ID_GET: |
| 510 | DEBUGP(DMI, "ID_GET\n"); |
| 511 | if ((bfd->priv_nr & 0xff) != OML_TO_BSC && |
| 512 | (bfd->priv_nr & 0xff) != RSL_TO_BSC) { |
| 513 | DEBUGP(DINP, "IDentity REQuest from BTS ?!?\n"); |
| 514 | return -EIO; |
| 515 | } |
| 516 | ipbc = ipc->bts_conn; |
| 517 | if (!ipbc) { |
| 518 | DEBUGP(DINP, "ID_GET from BSC before we have ID_RESP from BTS\n"); |
| 519 | return -EIO; |
| 520 | } |
| 521 | ret = write(bfd->fd, ipbc->id_resp, ipbc->id_resp_len); |
| 522 | break; |
| 523 | case IPAC_MSGT_ID_ACK: |
| 524 | DEBUGP(DMI, "ID_ACK? -> ACK!\n"); |
Pablo Neira Ayuso | b6a229e | 2011-04-07 14:15:06 +0200 | [diff] [blame] | 525 | ret = ipaccess_send_id_ack(bfd->fd); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 526 | break; |
Holger Hans Peter Freyther | 667a90e | 2010-06-09 17:38:59 +0800 | [diff] [blame] | 527 | default: |
| 528 | LOGP(DMI, LOGL_ERROR, "Unhandled IPA type; %d\n", msg_type); |
| 529 | return 1; |
| 530 | break; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 531 | } |
| 532 | return 0; |
| 533 | } |
| 534 | |
Pablo Neira Ayuso | b6a229e | 2011-04-07 14:15:06 +0200 | [diff] [blame] | 535 | struct msgb *ipaccess_proxy_read_msg(struct bsc_fd *bfd, int *error) |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 536 | { |
| 537 | struct msgb *msg = msgb_alloc(PROXY_ALLOC_SIZE, "Abis/IP"); |
| 538 | struct ipaccess_head *hh; |
| 539 | int len, ret = 0; |
| 540 | |
| 541 | if (!msg) { |
| 542 | *error = -ENOMEM; |
| 543 | return NULL; |
| 544 | } |
| 545 | |
| 546 | /* first read our 3-byte header */ |
| 547 | hh = (struct ipaccess_head *) msg->data; |
| 548 | ret = recv(bfd->fd, msg->data, 3, 0); |
| 549 | if (ret < 0) { |
Harald Welte | a2be686 | 2009-12-24 13:35:18 +0100 | [diff] [blame] | 550 | if (errno != EAGAIN) |
Harald Welte | 16eac96 | 2009-12-24 12:49:43 +0100 | [diff] [blame] | 551 | LOGP(DINP, LOGL_ERROR, "recv error: %s\n", strerror(errno)); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 552 | msgb_free(msg); |
| 553 | *error = ret; |
| 554 | return NULL; |
| 555 | } else if (ret == 0) { |
| 556 | msgb_free(msg); |
| 557 | *error = ret; |
| 558 | return NULL; |
| 559 | } |
| 560 | |
| 561 | msgb_put(msg, ret); |
| 562 | |
| 563 | /* then read te length as specified in header */ |
| 564 | msg->l2h = msg->data + sizeof(*hh); |
| 565 | len = ntohs(hh->len); |
| 566 | ret = recv(bfd->fd, msg->l2h, len, 0); |
| 567 | if (ret < len) { |
| 568 | LOGP(DINP, LOGL_ERROR, "short read!\n"); |
| 569 | msgb_free(msg); |
| 570 | *error = -EIO; |
| 571 | return NULL; |
| 572 | } |
| 573 | msgb_put(msg, ret); |
| 574 | |
| 575 | return msg; |
| 576 | } |
| 577 | |
| 578 | static struct ipa_proxy_conn *ipc_by_priv_nr(struct ipa_bts_conn *ipbc, |
| 579 | unsigned int priv_nr) |
| 580 | { |
| 581 | struct ipa_proxy_conn *bsc_conn; |
| 582 | unsigned int trx_id = priv_nr >> 8; |
| 583 | |
| 584 | switch (priv_nr & 0xff) { |
| 585 | case OML_FROM_BTS: /* incoming OML data from BTS, forward to BSC OML */ |
| 586 | bsc_conn = ipbc->bsc_oml_conn; |
| 587 | break; |
| 588 | case RSL_FROM_BTS: /* incoming RSL data from BTS, forward to BSC RSL */ |
| 589 | bsc_conn = ipbc->bsc_rsl_conn[trx_id]; |
| 590 | break; |
| 591 | case OML_TO_BSC: /* incoming OML data from BSC, forward to BTS OML */ |
| 592 | bsc_conn = ipbc->oml_conn; |
| 593 | break; |
| 594 | case RSL_TO_BSC: /* incoming RSL data from BSC, forward to BTS RSL */ |
| 595 | bsc_conn = ipbc->rsl_conn[trx_id]; |
| 596 | break; |
| 597 | default: |
| 598 | bsc_conn = NULL; |
| 599 | break; |
| 600 | } |
| 601 | return bsc_conn; |
| 602 | } |
| 603 | |
| 604 | static void reconn_tmr_cb(void *data) |
| 605 | { |
| 606 | struct ipa_proxy *ipp = data; |
| 607 | struct ipa_bts_conn *ipbc; |
| 608 | struct sockaddr_in sin; |
| 609 | int i; |
| 610 | |
| 611 | DEBUGP(DINP, "Running reconnect timer\n"); |
| 612 | |
| 613 | memset(&sin, 0, sizeof(sin)); |
| 614 | sin.sin_family = AF_INET; |
| 615 | inet_aton(bsc_ipaddr, &sin.sin_addr); |
| 616 | |
| 617 | llist_for_each_entry(ipbc, &ipp->bts_list, list) { |
| 618 | /* if OML to BSC is dead, try to restore it */ |
| 619 | if (ipbc->oml_conn && !ipbc->bsc_oml_conn) { |
Harald Welte | 9994b18 | 2009-12-23 22:47:53 +0100 | [diff] [blame] | 620 | sin.sin_port = htons(IPA_TCP_PORT_OML); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 621 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, 0); |
| 622 | LOGPC(DINP, LOGL_NOTICE, "OML Trying to reconnect\n"); |
| 623 | ipbc->bsc_oml_conn = connect_bsc(&sin, OML_TO_BSC, ipbc); |
| 624 | if (!ipbc->bsc_oml_conn) |
| 625 | goto reschedule; |
| 626 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, 0); |
| 627 | LOGPC(DINP, LOGL_NOTICE, "OML Reconnected\n"); |
| 628 | } |
| 629 | /* if we (still) don't have a OML connection, skip RSL */ |
| 630 | if (!ipbc->oml_conn || !ipbc->bsc_oml_conn) |
| 631 | continue; |
| 632 | |
| 633 | for (i = 0; i < ARRAY_SIZE(ipbc->rsl_conn); i++) { |
| 634 | unsigned int priv_nr; |
| 635 | /* don't establish RSL links which we don't have */ |
| 636 | if (!ipbc->rsl_conn[i]) |
| 637 | continue; |
| 638 | if (ipbc->bsc_rsl_conn[i]) |
| 639 | continue; |
| 640 | priv_nr = ipbc->rsl_conn[i]->fd.priv_nr; |
| 641 | priv_nr &= ~0xff; |
| 642 | priv_nr |= RSL_TO_BSC; |
Harald Welte | 9994b18 | 2009-12-23 22:47:53 +0100 | [diff] [blame] | 643 | sin.sin_port = htons(IPA_TCP_PORT_RSL); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 644 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, priv_nr >> 8); |
| 645 | LOGPC(DINP, LOGL_NOTICE, "RSL Trying to reconnect\n"); |
| 646 | ipbc->bsc_rsl_conn[i] = connect_bsc(&sin, priv_nr, ipbc); |
| 647 | if (!ipbc->bsc_rsl_conn) |
| 648 | goto reschedule; |
| 649 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, priv_nr >> 8); |
| 650 | LOGPC(DINP, LOGL_NOTICE, "RSL Reconnected\n"); |
| 651 | } |
| 652 | } |
| 653 | return; |
| 654 | |
| 655 | reschedule: |
| 656 | bsc_schedule_timer(&ipp->reconn_timer, 5, 0); |
| 657 | } |
| 658 | |
| 659 | static void handle_dead_socket(struct bsc_fd *bfd) |
| 660 | { |
| 661 | struct ipa_proxy_conn *ipc = bfd->data; /* local conn */ |
| 662 | struct ipa_proxy_conn *bsc_conn; /* remote conn */ |
| 663 | struct ipa_bts_conn *ipbc = ipc->bts_conn; |
| 664 | unsigned int trx_id = bfd->priv_nr >> 8; |
| 665 | struct msgb *msg, *msg2; |
| 666 | |
| 667 | bsc_unregister_fd(bfd); |
| 668 | close(bfd->fd); |
| 669 | bfd->fd = -1; |
| 670 | |
| 671 | /* FIXME: clear tx_queue, remove all references, etc. */ |
| 672 | llist_for_each_entry_safe(msg, msg2, &ipc->tx_queue, list) |
| 673 | msgb_free(msg); |
| 674 | |
| 675 | switch (bfd->priv_nr & 0xff) { |
| 676 | case OML_FROM_BTS: /* incoming OML data from BTS, forward to BSC OML */ |
Pablo Neira Ayuso | 83f40d1 | 2011-03-27 21:31:48 +0200 | [diff] [blame] | 677 | /* The BTS started a connection with us but we got no |
| 678 | * IPAC_MSGT_ID_RESP message yet, in that scenario we did not |
| 679 | * allocate the ipa_bts_conn structure. */ |
| 680 | if (ipbc == NULL) |
| 681 | break; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 682 | ipbc->oml_conn = NULL; |
| 683 | bsc_conn = ipbc->bsc_oml_conn; |
| 684 | /* close the connection to the BSC */ |
| 685 | bsc_unregister_fd(&bsc_conn->fd); |
| 686 | close(bsc_conn->fd.fd); |
| 687 | llist_for_each_entry_safe(msg, msg2, &bsc_conn->tx_queue, list) |
| 688 | msgb_free(msg); |
| 689 | talloc_free(bsc_conn); |
| 690 | ipbc->bsc_oml_conn = NULL; |
| 691 | /* FIXME: do we need to delete the entire ipbc ? */ |
| 692 | break; |
| 693 | case RSL_FROM_BTS: /* incoming RSL data from BTS, forward to BSC RSL */ |
| 694 | ipbc->rsl_conn[trx_id] = NULL; |
| 695 | bsc_conn = ipbc->bsc_rsl_conn[trx_id]; |
| 696 | /* close the connection to the BSC */ |
| 697 | bsc_unregister_fd(&bsc_conn->fd); |
| 698 | close(bsc_conn->fd.fd); |
| 699 | llist_for_each_entry_safe(msg, msg2, &bsc_conn->tx_queue, list) |
| 700 | msgb_free(msg); |
| 701 | talloc_free(bsc_conn); |
| 702 | ipbc->bsc_rsl_conn[trx_id] = NULL; |
| 703 | break; |
| 704 | case OML_TO_BSC: /* incoming OML data from BSC, forward to BTS OML */ |
| 705 | ipbc->bsc_oml_conn = NULL; |
| 706 | bsc_conn = ipbc->oml_conn; |
| 707 | /* start reconnect timer */ |
| 708 | bsc_schedule_timer(&ipp->reconn_timer, 5, 0); |
| 709 | break; |
| 710 | case RSL_TO_BSC: /* incoming RSL data from BSC, forward to BTS RSL */ |
| 711 | ipbc->bsc_rsl_conn[trx_id] = NULL; |
| 712 | bsc_conn = ipbc->rsl_conn[trx_id]; |
| 713 | /* start reconnect timer */ |
| 714 | bsc_schedule_timer(&ipp->reconn_timer, 5, 0); |
| 715 | break; |
| 716 | default: |
| 717 | bsc_conn = NULL; |
| 718 | break; |
| 719 | } |
| 720 | |
| 721 | talloc_free(ipc); |
| 722 | } |
| 723 | |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 724 | static void patch_gprs_msg(struct ipa_bts_conn *ipbc, int priv_nr, struct msgb *msg) |
| 725 | { |
| 726 | uint8_t *nsvci; |
| 727 | |
| 728 | if ((priv_nr & 0xff) != OML_FROM_BTS && (priv_nr & 0xff) != OML_TO_BSC) |
| 729 | return; |
| 730 | |
| 731 | if (msgb_l2len(msg) != 39) |
| 732 | return; |
| 733 | |
| 734 | /* |
| 735 | * Check if this is a IPA Set Attribute or IPA Set Attribute ACK |
| 736 | * and if the FOM Class is GPRS NSVC0 and then we will patch it. |
| 737 | * |
| 738 | * The patch assumes the message looks like the one from the trace |
| 739 | * but we only match messages with a specific size anyway... So |
| 740 | * this hack should work just fine. |
| 741 | */ |
| 742 | |
| 743 | if (msg->l2h[0] == 0x10 && msg->l2h[1] == 0x80 && |
| 744 | msg->l2h[2] == 0x00 && msg->l2h[3] == 0x15 && |
| 745 | msg->l2h[18] == 0xf5 && msg->l2h[19] == 0xf2) { |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 746 | nsvci = &msg->l2h[23]; |
| 747 | ipbc->gprs_orig_port = *(u_int16_t *)(nsvci+8); |
| 748 | ipbc->gprs_orig_ip = *(u_int32_t *)(nsvci+10); |
| 749 | *(u_int16_t *)(nsvci+8) = htons(ipbc->gprs_local_port); |
| 750 | *(u_int32_t *)(nsvci+10) = ipbc->ipp->listen_addr.s_addr; |
| 751 | } else if (msg->l2h[0] == 0x10 && msg->l2h[1] == 0x80 && |
| 752 | msg->l2h[2] == 0x00 && msg->l2h[3] == 0x15 && |
| 753 | msg->l2h[18] == 0xf6 && msg->l2h[19] == 0xf2) { |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 754 | nsvci = &msg->l2h[23]; |
| 755 | *(u_int16_t *)(nsvci+8) = ipbc->gprs_orig_port; |
| 756 | *(u_int32_t *)(nsvci+10) = ipbc->gprs_orig_ip; |
| 757 | } |
| 758 | } |
| 759 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 760 | static int handle_tcp_read(struct bsc_fd *bfd) |
| 761 | { |
| 762 | struct ipa_proxy_conn *ipc = bfd->data; |
| 763 | struct ipa_bts_conn *ipbc = ipc->bts_conn; |
| 764 | struct ipa_proxy_conn *bsc_conn; |
Harald Welte | 7bc08d3 | 2009-12-23 23:35:51 +0100 | [diff] [blame] | 765 | struct msgb *msg; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 766 | struct ipaccess_head *hh; |
| 767 | int ret = 0; |
| 768 | char *btsbsc; |
| 769 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 770 | if ((bfd->priv_nr & 0xff) <= 2) |
| 771 | btsbsc = "BTS"; |
| 772 | else |
| 773 | btsbsc = "BSC"; |
| 774 | |
Pablo Neira Ayuso | b6a229e | 2011-04-07 14:15:06 +0200 | [diff] [blame] | 775 | msg = ipaccess_proxy_read_msg(bfd, &ret); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 776 | if (!msg) { |
| 777 | if (ret == 0) { |
| 778 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, bfd->priv_nr >> 8); |
| 779 | LOGPC(DINP, LOGL_NOTICE, "%s disappeared, " |
| 780 | "dead socket\n", btsbsc); |
| 781 | handle_dead_socket(bfd); |
| 782 | } |
| 783 | return ret; |
| 784 | } |
| 785 | |
| 786 | msgb_put(msg, ret); |
| 787 | logp_ipbc_uid(DMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8); |
| 788 | DEBUGPC(DMI, "RX<-%s: %s\n", btsbsc, hexdump(msg->data, msg->len)); |
| 789 | |
| 790 | hh = (struct ipaccess_head *) msg->data; |
| 791 | if (hh->proto == IPAC_PROTO_IPACCESS) { |
| 792 | ret = ipaccess_rcvmsg(ipc, msg, bfd); |
| 793 | if (ret < 0) { |
| 794 | bsc_unregister_fd(bfd); |
| 795 | close(bfd->fd); |
| 796 | bfd->fd = -1; |
| 797 | talloc_free(bfd); |
Holger Hans Peter Freyther | 667a90e | 2010-06-09 17:38:59 +0800 | [diff] [blame] | 798 | msgb_free(msg); |
| 799 | return ret; |
| 800 | } else if (ret == 0) { |
| 801 | /* we do not forward parts of the CCM protocol |
| 802 | * through the proxy but rather terminate it ourselves. */ |
| 803 | msgb_free(msg); |
| 804 | return ret; |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 805 | } |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 806 | } |
| 807 | |
| 808 | if (!ipbc) { |
| 809 | LOGP(DINP, LOGL_ERROR, |
| 810 | "received %s packet but no ipc->bts_conn?!?\n", btsbsc); |
| 811 | msgb_free(msg); |
| 812 | return -EIO; |
| 813 | } |
| 814 | |
| 815 | bsc_conn = ipc_by_priv_nr(ipbc, bfd->priv_nr); |
| 816 | if (bsc_conn) { |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 817 | if (gprs_ns_ipaddr) |
| 818 | patch_gprs_msg(ipbc, bfd->priv_nr, msg); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 819 | /* enqueue packet towards BSC */ |
| 820 | msgb_enqueue(&bsc_conn->tx_queue, msg); |
| 821 | /* mark respective filedescriptor as 'we want to write' */ |
| 822 | bsc_conn->fd.when |= BSC_FD_WRITE; |
| 823 | } else { |
| 824 | logp_ipbc_uid(DINP, LOGL_INFO, ipbc, bfd->priv_nr >> 8); |
| 825 | LOGPC(DINP, LOGL_INFO, "Dropping packet from %s, " |
| 826 | "since remote connection is dead\n", btsbsc); |
| 827 | msgb_free(msg); |
| 828 | } |
| 829 | |
| 830 | return ret; |
| 831 | } |
| 832 | |
| 833 | /* a TCP socket is ready to be written to */ |
| 834 | static int handle_tcp_write(struct bsc_fd *bfd) |
| 835 | { |
| 836 | struct ipa_proxy_conn *ipc = bfd->data; |
| 837 | struct ipa_bts_conn *ipbc = ipc->bts_conn; |
| 838 | struct llist_head *lh; |
| 839 | struct msgb *msg; |
| 840 | char *btsbsc; |
| 841 | int ret; |
| 842 | |
| 843 | if ((bfd->priv_nr & 0xff) <= 2) |
| 844 | btsbsc = "BTS"; |
| 845 | else |
| 846 | btsbsc = "BSC"; |
| 847 | |
| 848 | |
| 849 | /* get the next msg for this timeslot */ |
| 850 | if (llist_empty(&ipc->tx_queue)) { |
| 851 | bfd->when &= ~BSC_FD_WRITE; |
| 852 | return 0; |
| 853 | } |
| 854 | lh = ipc->tx_queue.next; |
| 855 | llist_del(lh); |
| 856 | msg = llist_entry(lh, struct msgb, list); |
| 857 | |
| 858 | logp_ipbc_uid(DMI, LOGL_DEBUG, ipbc, bfd->priv_nr >> 8); |
| 859 | DEBUGPC(DMI, "TX %04x: %s\n", bfd->priv_nr, |
| 860 | hexdump(msg->data, msg->len)); |
| 861 | |
| 862 | ret = send(bfd->fd, msg->data, msg->len, 0); |
| 863 | msgb_free(msg); |
| 864 | |
| 865 | if (ret == 0) { |
| 866 | logp_ipbc_uid(DINP, LOGL_NOTICE, ipbc, bfd->priv_nr >> 8); |
| 867 | LOGP(DINP, LOGL_NOTICE, "%s disappeared, dead socket\n", btsbsc); |
| 868 | handle_dead_socket(bfd); |
| 869 | } |
| 870 | |
| 871 | return ret; |
| 872 | } |
| 873 | |
| 874 | /* callback from select.c in case one of the fd's can be read/written */ |
| 875 | static int ipaccess_fd_cb(struct bsc_fd *bfd, unsigned int what) |
| 876 | { |
| 877 | int rc = 0; |
| 878 | |
| 879 | if (what & BSC_FD_READ) { |
| 880 | rc = handle_tcp_read(bfd); |
| 881 | if (rc < 0) |
| 882 | return rc; |
| 883 | } |
| 884 | if (what & BSC_FD_WRITE) |
| 885 | rc = handle_tcp_write(bfd); |
| 886 | |
| 887 | return rc; |
| 888 | } |
| 889 | |
| 890 | /* callback of the listening filedescriptor */ |
| 891 | static int listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what) |
| 892 | { |
| 893 | int ret; |
| 894 | struct ipa_proxy_conn *ipc; |
| 895 | struct bsc_fd *bfd; |
| 896 | struct sockaddr_in sa; |
| 897 | socklen_t sa_len = sizeof(sa); |
| 898 | |
| 899 | if (!(what & BSC_FD_READ)) |
| 900 | return 0; |
| 901 | |
| 902 | ret = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len); |
| 903 | if (ret < 0) { |
| 904 | perror("accept"); |
| 905 | return ret; |
| 906 | } |
Holger Hans Peter Freyther | 7113514 | 2010-03-29 08:47:44 +0200 | [diff] [blame] | 907 | DEBUGP(DINP, "accept()ed new %s link from %s\n", |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 908 | (listen_bfd->priv_nr & 0xff) == OML_FROM_BTS ? "OML" : "RSL", |
| 909 | inet_ntoa(sa.sin_addr)); |
| 910 | |
| 911 | ipc = alloc_conn(); |
| 912 | if (!ipc) { |
| 913 | close(ret); |
| 914 | return -ENOMEM; |
| 915 | } |
| 916 | |
| 917 | bfd = &ipc->fd; |
| 918 | bfd->fd = ret; |
| 919 | bfd->data = ipc; |
| 920 | bfd->priv_nr = listen_bfd->priv_nr; |
| 921 | bfd->cb = ipaccess_fd_cb; |
| 922 | bfd->when = BSC_FD_READ; |
| 923 | ret = bsc_register_fd(bfd); |
| 924 | if (ret < 0) { |
| 925 | LOGP(DINP, LOGL_ERROR, "could not register FD\n"); |
| 926 | close(bfd->fd); |
| 927 | talloc_free(ipc); |
| 928 | return ret; |
| 929 | } |
| 930 | |
| 931 | /* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */ |
Pablo Neira Ayuso | b6a229e | 2011-04-07 14:15:06 +0200 | [diff] [blame] | 932 | ret = ipaccess_send_id_req(bfd->fd); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 933 | |
| 934 | return 0; |
| 935 | } |
| 936 | |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 937 | static void send_ns(int fd, const char *buf, int size, struct in_addr ip, int port) |
| 938 | { |
| 939 | int ret; |
| 940 | struct sockaddr_in addr; |
| 941 | socklen_t len = sizeof(addr); |
| 942 | memset(&addr, 0, sizeof(addr)); |
| 943 | |
| 944 | addr.sin_family = AF_INET; |
Holger Hans Peter Freyther | c6adead | 2010-06-10 15:56:26 +0800 | [diff] [blame] | 945 | addr.sin_port = htons(port); |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 946 | addr.sin_addr = ip; |
| 947 | |
| 948 | ret = sendto(fd, buf, size, 0, (struct sockaddr *) &addr, len); |
| 949 | if (ret < 0) { |
| 950 | LOGP(DINP, LOGL_ERROR, "Failed to forward GPRS message.\n"); |
| 951 | } |
| 952 | } |
| 953 | |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 954 | static int gprs_ns_cb(struct bsc_fd *bfd, unsigned int what) |
| 955 | { |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 956 | struct ipa_bts_conn *bts; |
| 957 | char buf[4096]; |
| 958 | int ret; |
| 959 | struct sockaddr_in sock; |
| 960 | socklen_t len = sizeof(sock); |
| 961 | |
| 962 | /* 1. get the data... */ |
| 963 | ret = recvfrom(bfd->fd, buf, sizeof(buf), 0, (struct sockaddr *) &sock, &len); |
| 964 | if (ret < 0) { |
| 965 | LOGP(DINP, LOGL_ERROR, "Failed to recv GPRS NS msg: %s.\n", strerror(errno)); |
| 966 | return -1; |
| 967 | } |
| 968 | |
| 969 | bts = bfd->data; |
| 970 | |
| 971 | /* 2. figure out where to send it to */ |
| 972 | if (memcmp(&sock.sin_addr, &ipp->gprs_addr, sizeof(sock.sin_addr)) == 0) { |
| 973 | LOGP(DINP, LOGL_DEBUG, "GPRS NS msg from network.\n"); |
| 974 | send_ns(bfd->fd, buf, ret, bts->bts_addr, 23000); |
| 975 | } else if (memcmp(&sock.sin_addr, &bts->bts_addr, sizeof(sock.sin_addr)) == 0) { |
| 976 | LOGP(DINP, LOGL_DEBUG, "GPRS NS msg from BTS.\n"); |
| 977 | send_ns(bfd->fd, buf, ret, ipp->gprs_addr, 23000); |
Holger Hans Peter Freyther | c6adead | 2010-06-10 15:56:26 +0800 | [diff] [blame] | 978 | } else { |
| 979 | LOGP(DINP, LOGL_ERROR, "Unknown GPRS source: %s\n", inet_ntoa(sock.sin_addr)); |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 980 | } |
| 981 | |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 982 | return 0; |
| 983 | } |
| 984 | |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 985 | static int make_gprs_sock(struct bsc_fd *bfd, int (*cb)(struct bsc_fd*,unsigned int), void *data) |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 986 | { |
| 987 | struct sockaddr_in addr; |
| 988 | int ret; |
| 989 | |
| 990 | bfd->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 991 | bfd->cb = cb; |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 992 | bfd->data = data; |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 993 | bfd->when = BSC_FD_READ; |
| 994 | |
| 995 | memset(&addr, 0, sizeof(addr)); |
| 996 | addr.sin_family = AF_INET; |
| 997 | addr.sin_port = 0; |
| 998 | inet_aton(listen_ipaddr, &addr.sin_addr); |
| 999 | |
| 1000 | ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr)); |
| 1001 | if (ret < 0) { |
| 1002 | LOGP(DINP, LOGL_ERROR, |
| 1003 | "Could not bind n socket for IP %s with error: %s.\n", |
| 1004 | listen_ipaddr, strerror(errno)); |
| 1005 | return -EIO; |
| 1006 | } |
| 1007 | |
| 1008 | ret = bsc_register_fd(bfd); |
| 1009 | if (ret < 0) { |
| 1010 | perror("register_listen_fd"); |
| 1011 | return ret; |
| 1012 | } |
| 1013 | return 0; |
| 1014 | } |
| 1015 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1016 | /* Actively connect to a BSC. */ |
| 1017 | static struct ipa_proxy_conn *connect_bsc(struct sockaddr_in *sa, int priv_nr, void *data) |
| 1018 | { |
| 1019 | struct ipa_proxy_conn *ipc; |
| 1020 | struct bsc_fd *bfd; |
| 1021 | int ret, on = 1; |
| 1022 | |
| 1023 | ipc = alloc_conn(); |
| 1024 | if (!ipc) |
| 1025 | return NULL; |
| 1026 | |
| 1027 | ipc->bts_conn = data; |
| 1028 | |
| 1029 | bfd = &ipc->fd; |
| 1030 | bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 1031 | bfd->cb = ipaccess_fd_cb; |
| 1032 | bfd->when = BSC_FD_READ | BSC_FD_WRITE; |
| 1033 | bfd->data = ipc; |
| 1034 | bfd->priv_nr = priv_nr; |
| 1035 | |
| 1036 | setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)); |
| 1037 | |
| 1038 | ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa)); |
| 1039 | if (ret < 0) { |
Holger Hans Peter Freyther | bf0bb1b | 2010-06-09 15:15:11 +0800 | [diff] [blame] | 1040 | LOGP(DINP, LOGL_ERROR, "Could not connect socket: %s\n", |
| 1041 | inet_ntoa(sa->sin_addr)); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1042 | close(bfd->fd); |
| 1043 | talloc_free(ipc); |
| 1044 | return NULL; |
| 1045 | } |
| 1046 | |
| 1047 | /* pre-fill tx_queue with identity request */ |
| 1048 | ret = bsc_register_fd(bfd); |
| 1049 | if (ret < 0) { |
| 1050 | close(bfd->fd); |
| 1051 | talloc_free(ipc); |
| 1052 | return NULL; |
| 1053 | } |
| 1054 | |
| 1055 | return ipc; |
| 1056 | } |
| 1057 | |
| 1058 | static int ipaccess_proxy_setup(void) |
| 1059 | { |
| 1060 | int ret; |
| 1061 | |
| 1062 | ipp = talloc_zero(tall_bsc_ctx, struct ipa_proxy); |
| 1063 | if (!ipp) |
| 1064 | return -ENOMEM; |
| 1065 | INIT_LLIST_HEAD(&ipp->bts_list); |
| 1066 | ipp->reconn_timer.cb = reconn_tmr_cb; |
| 1067 | ipp->reconn_timer.data = ipp; |
| 1068 | |
| 1069 | /* Listen for OML connections */ |
Pablo Neira Ayuso | c650d02 | 2011-04-07 14:15:02 +0200 | [diff] [blame] | 1070 | ret = make_sock(&ipp->oml_listen_fd, IPPROTO_TCP, INADDR_ANY, |
| 1071 | IPA_TCP_PORT_OML, OML_FROM_BTS, listen_fd_cb, NULL); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1072 | if (ret < 0) |
| 1073 | return ret; |
| 1074 | |
| 1075 | /* Listen for RSL connections */ |
Pablo Neira Ayuso | c650d02 | 2011-04-07 14:15:02 +0200 | [diff] [blame] | 1076 | ret = make_sock(&ipp->rsl_listen_fd, IPPROTO_TCP, INADDR_ANY, |
| 1077 | IPA_TCP_PORT_RSL, RSL_FROM_BTS, listen_fd_cb, NULL); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1078 | |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1079 | if (ret < 0) |
| 1080 | return ret; |
| 1081 | |
| 1082 | /* Connect the GPRS NS Socket */ |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 1083 | if (gprs_ns_ipaddr) { |
Holger Hans Peter Freyther | b3f0bfa | 2010-06-09 17:07:43 +0800 | [diff] [blame] | 1084 | inet_aton(gprs_ns_ipaddr, &ipp->gprs_addr); |
Holger Hans Peter Freyther | a07016f | 2010-06-10 15:57:08 +0800 | [diff] [blame] | 1085 | inet_aton(listen_ipaddr, &ipp->listen_addr); |
| 1086 | } |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1087 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1088 | return ret; |
| 1089 | } |
| 1090 | |
| 1091 | static void signal_handler(int signal) |
| 1092 | { |
| 1093 | fprintf(stdout, "signal %u received\n", signal); |
| 1094 | |
| 1095 | switch (signal) { |
| 1096 | case SIGABRT: |
| 1097 | /* in case of abort, we want to obtain a talloc report |
| 1098 | * and then return to the caller, who will abort the process */ |
| 1099 | case SIGUSR1: |
| 1100 | talloc_report_full(tall_bsc_ctx, stderr); |
| 1101 | break; |
| 1102 | default: |
| 1103 | break; |
| 1104 | } |
| 1105 | } |
| 1106 | |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1107 | static void print_help() |
| 1108 | { |
| 1109 | printf(" ipaccess-proxy is a proxy BTS.\n"); |
| 1110 | printf(" -h --help. This help text.\n"); |
| 1111 | printf(" -l --listen IP. The ip to listen to.\n"); |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1112 | printf(" -b --bsc IP. The BSC IP address.\n"); |
| 1113 | printf(" -g --gprs IP. Take GPRS NS from that IP.\n"); |
| 1114 | printf("\n"); |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1115 | printf(" -s --disable-color. Disable the color inside the logging message.\n"); |
| 1116 | printf(" -e --log-level number. Set the global loglevel.\n"); |
| 1117 | printf(" -T --timestamp. Prefix every log message with a timestamp.\n"); |
| 1118 | printf(" -V --version. Print the version of OpenBSC.\n"); |
| 1119 | } |
| 1120 | |
| 1121 | static void print_usage() |
| 1122 | { |
| 1123 | printf("Usage: ipaccess-proxy\n"); |
| 1124 | } |
| 1125 | |
| 1126 | static void handle_options(int argc, char** argv) |
| 1127 | { |
| 1128 | while (1) { |
| 1129 | int option_index = 0, c; |
| 1130 | static struct option long_options[] = { |
| 1131 | {"help", 0, 0, 'h'}, |
| 1132 | {"disable-color", 0, 0, 's'}, |
| 1133 | {"timestamp", 0, 0, 'T'}, |
| 1134 | {"log-level", 1, 0, 'e'}, |
| 1135 | {"listen", 1, 0, 'l'}, |
| 1136 | {"bsc", 1, 0, 'b'}, |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1137 | {"udp", 1, 0, 'u'}, |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1138 | {0, 0, 0, 0} |
| 1139 | }; |
| 1140 | |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1141 | c = getopt_long(argc, argv, "hsTe:l:b:g:", |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1142 | long_options, &option_index); |
| 1143 | if (c == -1) |
| 1144 | break; |
| 1145 | |
| 1146 | switch (c) { |
| 1147 | case 'h': |
| 1148 | print_usage(); |
| 1149 | print_help(); |
| 1150 | exit(0); |
| 1151 | case 'l': |
| 1152 | listen_ipaddr = optarg; |
| 1153 | break; |
| 1154 | case 'b': |
| 1155 | bsc_ipaddr = optarg; |
| 1156 | break; |
Holger Hans Peter Freyther | 4f2a374 | 2010-06-09 16:20:39 +0800 | [diff] [blame] | 1157 | case 'g': |
| 1158 | gprs_ns_ipaddr = optarg; |
| 1159 | break; |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1160 | case 's': |
| 1161 | log_set_use_color(stderr_target, 0); |
| 1162 | break; |
| 1163 | case 'T': |
| 1164 | log_set_print_timestamp(stderr_target, 1); |
| 1165 | break; |
| 1166 | case 'e': |
| 1167 | log_set_log_level(stderr_target, atoi(optarg)); |
| 1168 | break; |
| 1169 | default: |
| 1170 | /* ignore */ |
| 1171 | break; |
| 1172 | } |
| 1173 | } |
| 1174 | } |
| 1175 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1176 | int main(int argc, char **argv) |
| 1177 | { |
| 1178 | int rc; |
| 1179 | |
| 1180 | listen_ipaddr = "192.168.100.11"; |
| 1181 | bsc_ipaddr = "192.168.100.239"; |
| 1182 | |
| 1183 | tall_bsc_ctx = talloc_named_const(NULL, 1, "ipaccess-proxy"); |
| 1184 | |
Harald Welte | 51d2a59 | 2010-03-26 21:28:59 +0800 | [diff] [blame] | 1185 | log_init(&log_info); |
| 1186 | stderr_target = log_target_create_stderr(); |
| 1187 | log_add_target(stderr_target); |
| 1188 | log_set_all_filter(stderr_target, 1); |
| 1189 | log_parse_category_mask(stderr_target, "DINP:DMI"); |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1190 | |
Holger Hans Peter Freyther | da41bd4 | 2010-06-09 14:59:09 +0800 | [diff] [blame] | 1191 | handle_options(argc, argv); |
| 1192 | |
Harald Welte | 4818498 | 2009-12-23 22:44:04 +0100 | [diff] [blame] | 1193 | rc = ipaccess_proxy_setup(); |
| 1194 | if (rc < 0) |
| 1195 | exit(1); |
| 1196 | |
| 1197 | signal(SIGUSR1, &signal_handler); |
| 1198 | signal(SIGABRT, &signal_handler); |
| 1199 | |
| 1200 | while (1) { |
| 1201 | bsc_select_main(0); |
| 1202 | } |
| 1203 | } |