1 /* $OpenBSD: interface.c,v 1.11 2011/07/04 04:34:14 claudio Exp $ */ 2 3 /* 4 * Copyright (c) 2006 Michele Marchetto <mydecay@openbeer.it> 5 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 6 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include <sys/types.h> 22 #include <sys/ioctl.h> 23 #include <sys/time.h> 24 #include <sys/socket.h> 25 #include <netinet/in.h> 26 #include <arpa/inet.h> 27 #include <net/if.h> 28 #include <net/if_types.h> 29 #include <ctype.h> 30 #include <err.h> 31 #include <stdio.h> 32 #include <stdlib.h> 33 #include <unistd.h> 34 #include <string.h> 35 #include <event.h> 36 37 #include "ripd.h" 38 #include "log.h" 39 #include "rip.h" 40 #include "rde.h" 41 #include "ripe.h" 42 43 extern struct ripd_conf *conf; 44 45 int if_act_start(struct iface *); 46 int if_act_reset(struct iface *); 47 48 struct { 49 int state; 50 enum iface_event event; 51 enum iface_action action; 52 int new_state; 53 } iface_fsm[] = { 54 /* current state event that happened action to take resulting state */ 55 {IF_STA_DOWN, IF_EVT_UP, IF_ACT_STRT, 0}, 56 {IF_STA_ANY, IF_EVT_DOWN, IF_ACT_RST, IF_STA_DOWN}, 57 {-1, IF_EVT_NOTHING, IF_ACT_NOTHING, 0}, 58 }; 59 60 const char * const if_action_names[] = { 61 "NOTHING", 62 "START", 63 "RESET" 64 }; 65 66 static const char * const if_event_names[] = { 67 "NOTHING", 68 "UP", 69 "DOWN", 70 }; 71 72 void 73 if_init(struct ripd_conf *xconf, struct iface *iface) 74 { 75 struct ifreq ifr; 76 u_int rdomain; 77 78 /* XXX as in ospfd I would like to kill that. This is a design error */ 79 iface->fd = xconf->rip_socket; 80 81 strlcpy(ifr.ifr_name, iface->name, sizeof(ifr.ifr_name)); 82 if (ioctl(iface->fd, SIOCGIFRDOMAIN, (caddr_t)&ifr) == -1) 83 rdomain = 0; 84 else { 85 rdomain = ifr.ifr_rdomainid; 86 if (setsockopt(iface->fd, SOL_SOCKET, SO_RTABLE, &rdomain, 87 sizeof(rdomain)) == -1) 88 fatal("failed to set rdomain"); 89 } 90 if (rdomain != xconf->rdomain) 91 fatalx("interface rdomain mismatch"); 92 93 ripe_demote_iface(iface, 0); 94 } 95 96 int 97 if_fsm(struct iface *iface, enum iface_event event) 98 { 99 int old_state; 100 int new_state = 0; 101 int i, ret = 0; 102 103 old_state = iface->state; 104 105 for (i = 0; iface_fsm[i].state != -1; i++) 106 if ((iface_fsm[i].state & old_state) && 107 (iface_fsm[i].event == event)) { 108 new_state = iface_fsm[i].new_state; 109 break; 110 } 111 112 if (iface_fsm[i].state == -1) { 113 /* event outside of the defined fsm, ignore it. */ 114 log_debug("if_fsm: interface %s, " 115 "event '%s' not expected in state '%s'", iface->name, 116 if_event_name(event), if_state_name(old_state)); 117 return (0); 118 } 119 120 switch (iface_fsm[i].action) { 121 case IF_ACT_STRT: 122 ret = if_act_start(iface); 123 break; 124 case IF_ACT_RST: 125 ret = if_act_reset(iface); 126 break; 127 case IF_ACT_NOTHING: 128 /* do nothing */ 129 break; 130 } 131 132 if (ret) { 133 log_debug("if_fsm: error changing state for interface %s, " 134 "event '%s', state '%s'", iface->name, if_event_name(event), 135 if_state_name(old_state)); 136 return (0); 137 } 138 139 if (new_state != 0) 140 iface->state = new_state; 141 142 if (old_state == IF_STA_ACTIVE && iface->state == IF_STA_DOWN) 143 ripe_demote_iface(iface, 0); 144 if (old_state & IF_STA_DOWN && iface->state == IF_STA_ACTIVE) 145 ripe_demote_iface(iface, 1); 146 147 log_debug("if_fsm: event '%s' resulted in action '%s' and changing " 148 "state for interface %s from '%s' to '%s'", 149 if_event_name(event), if_action_name(iface_fsm[i].action), 150 iface->name, if_state_name(old_state), if_state_name(iface->state)); 151 152 return (ret); 153 } 154 155 struct iface * 156 if_find_index(u_short ifindex) 157 { 158 struct iface *iface; 159 160 LIST_FOREACH(iface, &conf->iface_list, entry) { 161 if (iface->ifindex == ifindex) 162 return (iface); 163 } 164 165 return (NULL); 166 } 167 168 169 /* actions */ 170 int 171 if_act_start(struct iface *iface) 172 { 173 struct in_addr addr; 174 struct timeval now; 175 176 if (iface->passive) { 177 log_debug("if_act_start: cannot start passive interface %s", 178 iface->name); 179 return (0); 180 } 181 182 if (!((iface->flags & IFF_UP) && 183 LINK_STATE_IS_UP(iface->linkstate))) { 184 log_debug("if_act_start: interface %s link down", 185 iface->name); 186 return (0); 187 } 188 189 gettimeofday(&now, NULL); 190 iface->uptime = now.tv_sec; 191 192 switch (iface->type) { 193 case IF_TYPE_POINTOPOINT: 194 case IF_TYPE_BROADCAST: 195 inet_aton(ALL_RIP_ROUTERS, &addr); 196 if (if_join_group(iface, &addr)) { 197 log_warn("if_act_start: error joining group %s, " 198 "interface %s", inet_ntoa(addr), iface->name); 199 return (-1); 200 } 201 202 iface->state = IF_STA_ACTIVE; 203 break; 204 default: 205 fatalx("if_act_start: unknown interface type"); 206 } 207 208 return (0); 209 } 210 211 int 212 if_act_reset(struct iface *iface) 213 { 214 struct nbr *nbr = NULL; 215 struct in_addr addr; 216 217 if (iface->passive) 218 return (0); 219 220 switch (iface->type) { 221 case IF_TYPE_POINTOPOINT: 222 case IF_TYPE_BROADCAST: 223 inet_aton(ALL_RIP_ROUTERS, &addr); 224 if (if_leave_group(iface, &addr)) { 225 log_warn("if_act_reset: error leaving group %s, " 226 "interface %s", inet_ntoa(addr), iface->name); 227 } 228 break; 229 default: 230 fatalx("if_act_reset: unknown interface type"); 231 } 232 233 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 234 if (nbr_fsm(nbr, NBR_EVT_KILL_NBR)) { 235 log_debug("if_act_reset: error killing neighbor %s", 236 inet_ntoa(nbr->id)); 237 } 238 } 239 240 return (0); 241 } 242 243 const char * 244 if_event_name(int event) 245 { 246 return (if_event_names[event]); 247 } 248 249 const char * 250 if_action_name(int action) 251 { 252 return (if_action_names[action]); 253 } 254 255 /* misc */ 256 int 257 if_set_mcast_ttl(int fd, u_int8_t ttl) 258 { 259 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, 260 (char *)&ttl, sizeof(ttl)) < 0) { 261 log_warn("if_set_mcast_ttl: error setting " 262 "IP_MULTICAST_TTL to %d", ttl); 263 return (-1); 264 } 265 266 return (0); 267 } 268 269 int 270 if_set_opt(int fd) 271 { 272 int yes = 1; 273 274 if (setsockopt(fd, IPPROTO_IP, IP_RECVIF, &yes, 275 sizeof(int)) < 0) { 276 log_warn("if_set_opt: error setting IP_RECVIF"); 277 return (-1); 278 } 279 280 return (0); 281 } 282 283 int 284 if_set_tos(int fd, int tos) 285 { 286 if (setsockopt(fd, IPPROTO_IP, IP_TOS, 287 (int *)&tos, sizeof(tos)) < 0) { 288 log_warn("if_set_tos: error setting IP_TOS to 0x%x", tos); 289 return (-1); 290 } 291 292 return (0); 293 } 294 295 int 296 if_set_mcast(struct iface *iface) 297 { 298 switch (iface->type) { 299 case IF_TYPE_POINTOPOINT: 300 case IF_TYPE_BROADCAST: 301 if (setsockopt(iface->fd, IPPROTO_IP, IP_MULTICAST_IF, 302 &iface->addr.s_addr, sizeof(iface->addr.s_addr)) < 0) { 303 log_debug("if_set_mcast: error setting " 304 "IP_MULTICAST_IF, interface %s", iface->name); 305 return (-1); 306 } 307 break; 308 default: 309 fatalx("if_set_mcast: unknown interface type"); 310 } 311 312 return (0); 313 } 314 315 int 316 if_set_mcast_loop(int fd) 317 { 318 u_int8_t loop = 0; 319 320 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, 321 (char *)&loop, sizeof(loop)) < 0) { 322 log_warn("if_set_mcast_loop: error setting IP_MULTICAST_LOOP"); 323 return (-1); 324 } 325 326 return (0); 327 } 328 329 void 330 if_set_recvbuf(int fd) 331 { 332 int bsize; 333 334 bsize = 65535; 335 while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, 336 sizeof(bsize)) == -1) 337 bsize /= 2; 338 } 339 340 int 341 if_join_group(struct iface *iface, struct in_addr *addr) 342 { 343 struct ip_mreq mreq; 344 345 switch (iface->type) { 346 case IF_TYPE_POINTOPOINT: 347 case IF_TYPE_BROADCAST: 348 mreq.imr_multiaddr.s_addr = addr->s_addr; 349 mreq.imr_interface.s_addr = iface->addr.s_addr; 350 351 if (setsockopt(iface->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 352 (void *)&mreq, sizeof(mreq)) < 0) 353 return (-1); 354 break; 355 default: 356 fatalx("if_join_group: unknown interface type"); 357 } 358 359 return (0); 360 } 361 362 int 363 if_leave_group(struct iface *iface, struct in_addr *addr) 364 { 365 struct ip_mreq mreq; 366 367 switch (iface->type) { 368 case IF_TYPE_POINTOPOINT: 369 case IF_TYPE_BROADCAST: 370 mreq.imr_multiaddr.s_addr = addr->s_addr; 371 mreq.imr_interface.s_addr = iface->addr.s_addr; 372 373 if (setsockopt(iface->fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, 374 (void *)&mreq, sizeof(mreq)) < 0) 375 return (-1); 376 break; 377 default: 378 fatalx("if_leave_group: unknown interface type"); 379 } 380 381 return (0); 382 } 383 384 struct iface * 385 if_new(struct kif *kif) 386 { 387 struct sockaddr_in *sain; 388 struct iface *iface; 389 struct ifreq *ifr; 390 int s; 391 392 if ((iface = calloc(1, sizeof(*iface))) == NULL) 393 err(1, "if_new: calloc"); 394 395 iface->state = IF_STA_DOWN; 396 397 LIST_INIT(&iface->nbr_list); 398 TAILQ_INIT(&iface->rp_list); 399 TAILQ_INIT(&iface->rq_list); 400 401 strlcpy(iface->name, kif->ifname, sizeof(iface->name)); 402 403 if ((ifr = calloc(1, sizeof(*ifr))) == NULL) 404 err(1, "if_new: calloc"); 405 406 /* set up ifreq */ 407 strlcpy(ifr->ifr_name, kif->ifname, sizeof(ifr->ifr_name)); 408 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 409 err(1, "if_new: socket"); 410 411 /* get type */ 412 if (kif->flags & IFF_POINTOPOINT) 413 iface->type = IF_TYPE_POINTOPOINT; 414 if (kif->flags & IFF_BROADCAST && 415 kif->flags & IFF_MULTICAST) 416 iface->type = IF_TYPE_BROADCAST; 417 if (kif->flags & IFF_LOOPBACK) { 418 iface->type = IF_TYPE_POINTOPOINT; 419 /* XXX protect loopback from sending packets over lo? */ 420 } 421 422 /* get mtu, index and flags */ 423 iface->mtu = kif->mtu; 424 iface->ifindex = kif->ifindex; 425 iface->flags = kif->flags; 426 iface->linkstate = kif->link_state; 427 iface->media_type = kif->media_type; 428 iface->baudrate = kif->baudrate; 429 430 /* get address */ 431 if (ioctl(s, SIOCGIFADDR, ifr) < 0) 432 err(1, "if_new: cannot get address"); 433 sain = (struct sockaddr_in *)&ifr->ifr_addr; 434 iface->addr = sain->sin_addr; 435 436 /* get mask */ 437 if (ioctl(s, SIOCGIFNETMASK, ifr) < 0) 438 err(1, "if_new: cannot get mask"); 439 sain = (struct sockaddr_in *)&ifr->ifr_addr; 440 iface->mask = sain->sin_addr; 441 442 /* get p2p dst address */ 443 if (kif->flags & IFF_POINTOPOINT) { 444 if (ioctl(s, SIOCGIFDSTADDR, ifr) < 0) 445 err(1, "if_new: cannot get dst addr"); 446 sain = (struct sockaddr_in *)&ifr->ifr_addr; 447 iface->dst = sain->sin_addr; 448 } 449 450 free(ifr); 451 close(s); 452 453 return (iface); 454 } 455 456 void 457 if_del(struct iface *iface) 458 { 459 struct nbr *nbr; 460 461 log_debug("if_del: interface %s", iface->name); 462 463 /* revert the demotion when the interface is deleted */ 464 if (iface->state == IF_STA_DOWN) 465 ripe_demote_iface(iface, 1); 466 467 /* clear lists etc */ 468 while ((nbr = LIST_FIRST(&iface->nbr_list)) != NULL) 469 nbr_act_del(nbr); 470 471 /* XXX rq_list, rp_list */ 472 473 free(iface); 474 } 475 476 struct ctl_iface * 477 if_to_ctl(struct iface *iface) 478 { 479 static struct ctl_iface ictl; 480 struct timeval now; 481 482 memcpy(ictl.name, iface->name, sizeof(ictl.name)); 483 memcpy(&ictl.addr, &iface->addr, sizeof(ictl.addr)); 484 memcpy(&ictl.mask, &iface->mask, sizeof(ictl.mask)); 485 486 ictl.ifindex = iface->ifindex; 487 ictl.state = iface->state; 488 ictl.mtu = iface->mtu; 489 490 ictl.baudrate = iface->baudrate; 491 ictl.flags = iface->flags; 492 ictl.metric = iface->cost; 493 ictl.type = iface->type; 494 ictl.linkstate = iface->linkstate; 495 ictl.passive = iface->passive; 496 ictl.mediatype = iface->media_type; 497 498 gettimeofday(&now, NULL); 499 500 if (iface->state != IF_STA_DOWN) { 501 ictl.uptime = now.tv_sec - iface->uptime; 502 } else 503 ictl.uptime = 0; 504 505 return (&ictl); 506 } 507