1 /* $OpenBSD: interface.c,v 1.5 2007/10/24 19:50:33 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 /* XXX as in ospfd I would like to kill that. This is a design error */ 76 iface->fd = xconf->rip_socket; 77 } 78 79 int 80 if_fsm(struct iface *iface, enum iface_event event) 81 { 82 int old_state; 83 int new_state = 0; 84 int i, ret = 0; 85 86 old_state = iface->state; 87 88 for (i = 0; iface_fsm[i].state != -1; i++) 89 if ((iface_fsm[i].state & old_state) && 90 (iface_fsm[i].event == event)) { 91 new_state = iface_fsm[i].new_state; 92 break; 93 } 94 95 if (iface_fsm[i].state == -1) { 96 /* event outside of the defined fsm, ignore it. */ 97 log_debug("if_fsm: interface %s, " 98 "event '%s' not expected in state '%s'", iface->name, 99 if_event_name(event), if_state_name(old_state)); 100 return (0); 101 } 102 103 switch (iface_fsm[i].action) { 104 case IF_ACT_STRT: 105 ret = if_act_start(iface); 106 break; 107 case IF_ACT_RST: 108 ret = if_act_reset(iface); 109 break; 110 case IF_ACT_NOTHING: 111 /* do nothing */ 112 break; 113 } 114 115 if (ret) { 116 log_debug("if_fsm: error changing state for interface %s, " 117 "event '%s', state '%s'", iface->name, if_event_name(event), 118 if_state_name(old_state)); 119 return (0); 120 } 121 122 if (new_state != 0) 123 iface->state = new_state; 124 125 log_debug("if_fsm: event '%s' resulted in action '%s' and changing " 126 "state for interface %s from '%s' to '%s'", 127 if_event_name(event), if_action_name(iface_fsm[i].action), 128 iface->name, if_state_name(old_state), if_state_name(iface->state)); 129 130 return (ret); 131 } 132 133 struct iface * 134 if_find_index(u_short ifindex) 135 { 136 struct iface *iface; 137 138 LIST_FOREACH(iface, &conf->iface_list, entry) { 139 if (iface->ifindex == ifindex) 140 return (iface); 141 } 142 143 return (NULL); 144 } 145 146 147 /* actions */ 148 int 149 if_act_start(struct iface *iface) 150 { 151 struct in_addr addr; 152 struct timeval now; 153 154 if (iface->passive) { 155 log_debug("if_act_start: cannot start passive interface %s", 156 iface->name); 157 return (0); 158 } 159 160 if (!((iface->flags & IFF_UP) && 161 (LINK_STATE_IS_UP(iface->linkstate) || 162 (iface->linkstate == LINK_STATE_UNKNOWN && 163 iface->media_type != IFT_CARP)))) { 164 log_debug("if_act_start: interface %s link down", 165 iface->name); 166 return (0); 167 } 168 169 gettimeofday(&now, NULL); 170 iface->uptime = now.tv_sec; 171 172 switch (iface->type) { 173 case IF_TYPE_POINTOPOINT: 174 case IF_TYPE_BROADCAST: 175 inet_aton(ALL_RIP_ROUTERS, &addr); 176 if (if_join_group(iface, &addr)) { 177 log_warn("if_act_start: error joining group %s, " 178 "interface %s", inet_ntoa(addr), iface->name); 179 return (-1); 180 } 181 182 iface->state = IF_STA_ACTIVE; 183 break; 184 default: 185 fatalx("if_act_start: unknown interface type"); 186 } 187 188 return (0); 189 } 190 191 int 192 if_act_reset(struct iface *iface) 193 { 194 struct nbr *nbr = NULL; 195 struct in_addr addr; 196 197 if (iface->passive) 198 return (0); 199 200 switch (iface->type) { 201 case IF_TYPE_POINTOPOINT: 202 case IF_TYPE_BROADCAST: 203 inet_aton(ALL_RIP_ROUTERS, &addr); 204 if (if_leave_group(iface, &addr)) { 205 log_warn("if_act_reset: error leaving group %s, " 206 "interface %s", inet_ntoa(addr), iface->name); 207 } 208 break; 209 default: 210 fatalx("if_act_reset: unknown interface type"); 211 } 212 213 LIST_FOREACH(nbr, &iface->nbr_list, entry) { 214 if (nbr_fsm(nbr, NBR_EVT_KILL_NBR)) { 215 log_debug("if_act_reset: error killing neighbor %s", 216 inet_ntoa(nbr->id)); 217 } 218 } 219 220 return (0); 221 } 222 223 const char * 224 if_event_name(int event) 225 { 226 return (if_event_names[event]); 227 } 228 229 const char * 230 if_action_name(int action) 231 { 232 return (if_action_names[action]); 233 } 234 235 /* misc */ 236 int 237 if_set_mcast_ttl(int fd, u_int8_t ttl) 238 { 239 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, 240 (char *)&ttl, sizeof(ttl)) < 0) { 241 log_warn("if_set_mcast_ttl: error setting " 242 "IP_MULTICAST_TTL to %d", ttl); 243 return (-1); 244 } 245 246 return (0); 247 } 248 249 int 250 if_set_opt(int fd) 251 { 252 int yes = 1; 253 254 if (setsockopt(fd, IPPROTO_IP, IP_RECVIF, &yes, 255 sizeof(int)) < 0) { 256 log_warn("if_set_opt: error setting IP_RECVIF"); 257 return (-1); 258 } 259 260 return (0); 261 } 262 263 int 264 if_set_tos(int fd, int tos) 265 { 266 if (setsockopt(fd, IPPROTO_IP, IP_TOS, 267 (int *)&tos, sizeof(tos)) < 0) { 268 log_warn("if_set_tos: error setting IP_TOS to 0x%x", tos); 269 return (-1); 270 } 271 272 return (0); 273 } 274 275 int 276 if_set_mcast(struct iface *iface) 277 { 278 switch (iface->type) { 279 case IF_TYPE_POINTOPOINT: 280 case IF_TYPE_BROADCAST: 281 if (setsockopt(iface->fd, IPPROTO_IP, IP_MULTICAST_IF, 282 &iface->addr.s_addr, sizeof(iface->addr.s_addr)) < 0) { 283 log_debug("if_set_mcast: error setting " 284 "IP_MULTICAST_IF, interface %s", iface->name); 285 return (-1); 286 } 287 break; 288 default: 289 fatalx("if_set_mcast: unknown interface type"); 290 } 291 292 return (0); 293 } 294 295 int 296 if_set_mcast_loop(int fd) 297 { 298 u_int8_t loop = 0; 299 300 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, 301 (char *)&loop, sizeof(loop)) < 0) { 302 log_warn("if_set_mcast_loop: error setting IP_MULTICAST_LOOP"); 303 return (-1); 304 } 305 306 return (0); 307 } 308 309 void 310 if_set_recvbuf(int fd) 311 { 312 int bsize; 313 314 bsize = 65535; 315 while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, 316 sizeof(bsize)) == -1) 317 bsize /= 2; 318 } 319 320 int 321 if_join_group(struct iface *iface, struct in_addr *addr) 322 { 323 struct ip_mreq mreq; 324 325 switch (iface->type) { 326 case IF_TYPE_POINTOPOINT: 327 case IF_TYPE_BROADCAST: 328 mreq.imr_multiaddr.s_addr = addr->s_addr; 329 mreq.imr_interface.s_addr = iface->addr.s_addr; 330 331 if (setsockopt(iface->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, 332 (void *)&mreq, sizeof(mreq)) < 0) 333 return (-1); 334 break; 335 default: 336 fatalx("if_join_group: unknown interface type"); 337 } 338 339 return (0); 340 } 341 342 int 343 if_leave_group(struct iface *iface, struct in_addr *addr) 344 { 345 struct ip_mreq mreq; 346 347 switch (iface->type) { 348 case IF_TYPE_POINTOPOINT: 349 case IF_TYPE_BROADCAST: 350 mreq.imr_multiaddr.s_addr = addr->s_addr; 351 mreq.imr_interface.s_addr = iface->addr.s_addr; 352 353 if (setsockopt(iface->fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, 354 (void *)&mreq, sizeof(mreq)) < 0) 355 return (-1); 356 break; 357 default: 358 fatalx("if_leave_group: unknown interface type"); 359 } 360 361 return (0); 362 } 363 364 struct iface * 365 if_new(struct kif *kif) 366 { 367 struct sockaddr_in *sain; 368 struct iface *iface; 369 struct ifreq *ifr; 370 int s; 371 372 if ((iface = calloc(1, sizeof(*iface))) == NULL) 373 err(1, "if_new: calloc"); 374 375 iface->state = IF_STA_DOWN; 376 377 LIST_INIT(&iface->nbr_list); 378 TAILQ_INIT(&iface->rp_list); 379 TAILQ_INIT(&iface->rq_list); 380 381 strlcpy(iface->name, kif->ifname, sizeof(iface->name)); 382 383 if ((ifr = calloc(1, sizeof(*ifr))) == NULL) 384 err(1, "if_new: calloc"); 385 386 /* set up ifreq */ 387 strlcpy(ifr->ifr_name, kif->ifname, sizeof(ifr->ifr_name)); 388 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 389 err(1, "if_new: socket"); 390 391 /* get type */ 392 if (kif->flags & IFF_POINTOPOINT) 393 iface->type = IF_TYPE_POINTOPOINT; 394 if (kif->flags & IFF_BROADCAST && 395 kif->flags & IFF_MULTICAST) 396 iface->type = IF_TYPE_BROADCAST; 397 if (kif->flags & IFF_LOOPBACK) { 398 iface->type = IF_TYPE_POINTOPOINT; 399 /* XXX protect loopback from sending packets over lo? */ 400 } 401 402 /* get mtu, index and flags */ 403 iface->mtu = kif->mtu; 404 iface->ifindex = kif->ifindex; 405 iface->flags = kif->flags; 406 iface->linkstate = kif->link_state; 407 iface->media_type = kif->media_type; 408 iface->baudrate = kif->baudrate; 409 410 /* get address */ 411 if (ioctl(s, SIOCGIFADDR, ifr) < 0) 412 err(1, "if_new: cannot get address"); 413 sain = (struct sockaddr_in *)&ifr->ifr_addr; 414 iface->addr = sain->sin_addr; 415 416 /* get mask */ 417 if (ioctl(s, SIOCGIFNETMASK, ifr) < 0) 418 err(1, "if_new: cannot get mask"); 419 sain = (struct sockaddr_in *)&ifr->ifr_addr; 420 iface->mask = sain->sin_addr; 421 422 /* get p2p dst address */ 423 if (kif->flags & IFF_POINTOPOINT) { 424 if (ioctl(s, SIOCGIFDSTADDR, ifr) < 0) 425 err(1, "if_new: cannot get dst addr"); 426 sain = (struct sockaddr_in *)&ifr->ifr_addr; 427 iface->dst = sain->sin_addr; 428 } 429 430 free(ifr); 431 close(s); 432 433 return (iface); 434 } 435 436 void 437 if_del(struct iface *iface) 438 { 439 struct nbr *nbr; 440 441 log_debug("if_del: interface %s", iface->name); 442 443 /* clear lists etc */ 444 while ((nbr = LIST_FIRST(&iface->nbr_list)) != NULL) 445 nbr_act_del(nbr); 446 447 /* XXX rq_list, rp_list */ 448 449 free(iface); 450 } 451 452 struct ctl_iface * 453 if_to_ctl(struct iface *iface) 454 { 455 static struct ctl_iface ictl; 456 struct timeval now; 457 458 memcpy(ictl.name, iface->name, sizeof(ictl.name)); 459 memcpy(&ictl.addr, &iface->addr, sizeof(ictl.addr)); 460 memcpy(&ictl.mask, &iface->mask, sizeof(ictl.mask)); 461 462 ictl.ifindex = iface->ifindex; 463 ictl.state = iface->state; 464 ictl.mtu = iface->mtu; 465 466 ictl.baudrate = iface->baudrate; 467 ictl.flags = iface->flags; 468 ictl.metric = iface->cost; 469 ictl.type = iface->type; 470 ictl.linkstate = iface->linkstate; 471 ictl.passive = iface->passive; 472 ictl.mediatype = iface->media_type; 473 474 gettimeofday(&now, NULL); 475 476 if (iface->state != IF_STA_DOWN) { 477 ictl.uptime = now.tv_sec - iface->uptime; 478 } else 479 ictl.uptime = 0; 480 481 return (&ictl); 482 } 483