interface.c revision 1.11
1/* $OpenBSD: interface.c,v 1.11 2013/05/30 16:22:52 claudio Exp $ */ 2 3/* 4 * Copyright (c) 2005 Claudio Jeker <claudio@openbsd.org> 5 * Copyright (c) 2004, 2005, 2008 Esben Norby <norby@openbsd.org> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include <sys/types.h> 21#include <sys/ioctl.h> 22#include <sys/time.h> 23#include <sys/socket.h> 24#include <netinet/in.h> 25#include <arpa/inet.h> 26#include <net/if.h> 27#include <net/if_types.h> 28#include <fcntl.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 "ldpd.h" 38#include "ldp.h" 39#include "log.h" 40#include "ldpe.h" 41 42void if_hello_timer(int, short, void *); 43void if_start_hello_timer(struct iface *); 44void if_stop_hello_timer(struct iface *); 45struct nbr *if_elect(struct nbr *, struct nbr *); 46 47struct { 48 int state; 49 enum iface_event event; 50 enum iface_action action; 51 int new_state; 52} iface_fsm[] = { 53 /* current state event that happened action to take resulting state */ 54 {IF_STA_DOWN, IF_EVT_UP, IF_ACT_STRT, 0}, 55 {IF_STA_LOOPBACK, IF_EVT_DOWN, IF_ACT_NOTHING, IF_STA_DOWN}, 56 {IF_STA_ANY, IF_EVT_DOWN, IF_ACT_RST, IF_STA_DOWN}, 57 {-1, IF_EVT_NOTHING, IF_ACT_NOTHING, 0}, 58}; 59 60const char * const if_event_names[] = { 61 "NOTHING", 62 "UP", 63 "DOWN" 64}; 65 66const char * const if_action_names[] = { 67 "NOTHING", 68 "START", 69 "RESET" 70}; 71 72int 73if_fsm(struct iface *iface, enum iface_event event) 74{ 75 int old_state; 76 int new_state = 0; 77 int i, ret = 0; 78 79 old_state = iface->state; 80 81 for (i = 0; iface_fsm[i].state != -1; i++) 82 if ((iface_fsm[i].state & old_state) && 83 (iface_fsm[i].event == event)) { 84 new_state = iface_fsm[i].new_state; 85 break; 86 } 87 88 if (iface_fsm[i].state == -1) { 89 /* event outside of the defined fsm, ignore it. */ 90 log_debug("if_fsm: interface %s, " 91 "event %s not expected in state %s", iface->name, 92 if_event_names[event], if_state_name(old_state)); 93 return (0); 94 } 95 96 switch (iface_fsm[i].action) { 97 case IF_ACT_STRT: 98 ret = if_act_start(iface); 99 break; 100 case IF_ACT_RST: 101 ret = if_act_reset(iface); 102 break; 103 case IF_ACT_NOTHING: 104 /* do nothing */ 105 break; 106 } 107 108 if (ret) { 109 log_debug("if_fsm: error changing state for interface %s, " 110 "event %s, state %s", iface->name, if_event_names[event], 111 if_state_name(old_state)); 112 return (-1); 113 } 114 115 if (new_state != 0) 116 iface->state = new_state; 117 118 log_debug("if_fsm: event %s resulted in action %s and changing " 119 "state for interface %s from %s to %s", 120 if_event_names[event], if_action_names[iface_fsm[i].action], 121 iface->name, if_state_name(old_state), if_state_name(iface->state)); 122 123 return (ret); 124} 125 126struct iface * 127if_new(struct kif *kif, struct kif_addr *ka) 128{ 129 struct iface *iface; 130 131 if ((iface = calloc(1, sizeof(*iface))) == NULL) 132 err(1, "if_new: calloc"); 133 134 iface->state = IF_STA_DOWN; 135 136 LIST_INIT(&iface->lde_nbr_list); 137 138 strlcpy(iface->name, kif->ifname, sizeof(iface->name)); 139 140 /* get type */ 141 if (kif->flags & IFF_POINTOPOINT) 142 iface->type = IF_TYPE_POINTOPOINT; 143 if (kif->flags & IFF_BROADCAST && 144 kif->flags & IFF_MULTICAST) 145 iface->type = IF_TYPE_BROADCAST; 146 if (kif->flags & IFF_LOOPBACK) { 147 iface->type = IF_TYPE_POINTOPOINT; 148 iface->state = IF_STA_LOOPBACK; 149 } 150 151 /* get mtu, index and flags */ 152 iface->mtu = kif->mtu; 153 iface->ifindex = kif->ifindex; 154 iface->flags = kif->flags; 155 iface->linkstate = kif->link_state; 156 iface->media_type = kif->media_type; 157 iface->baudrate = kif->baudrate; 158 159 /* set address, mask and p2p addr */ 160 iface->addr = ka->addr; 161 iface->mask = ka->mask; 162 if (kif->flags & IFF_POINTOPOINT) { 163 iface->dst = ka->dstbrd; 164 } 165 166 return (iface); 167} 168 169void 170if_del(struct iface *iface) 171{ 172 log_debug("if_del: interface %s", iface->name); 173 174 if (evtimer_pending(&iface->hello_timer, NULL)) 175 evtimer_del(&iface->hello_timer); 176 177 free(iface); 178} 179 180void 181if_init(struct ldpd_conf *xconf, struct iface *iface) 182{ 183 /* set event handlers for interface */ 184 evtimer_set(&iface->hello_timer, if_hello_timer, iface); 185 186 iface->discovery_fd = xconf->ldp_discovery_socket; 187} 188 189/* timers */ 190/* ARGSUSED */ 191void 192if_hello_timer(int fd, short event, void *arg) 193{ 194 struct iface *iface = arg; 195 struct timeval tv; 196 197 send_hello(iface); 198 199 /* reschedule hello_timer */ 200 timerclear(&tv); 201 tv.tv_sec = iface->hello_interval; 202 if (evtimer_add(&iface->hello_timer, &tv) == -1) 203 fatal("if_hello_timer"); 204} 205 206void 207if_start_hello_timer(struct iface *iface) 208{ 209 struct timeval tv; 210 211 timerclear(&tv); 212 tv.tv_sec = iface->hello_interval; 213 if (evtimer_add(&iface->hello_timer, &tv) == -1) 214 fatal("if_start_hello_timer"); 215} 216 217void 218if_stop_hello_timer(struct iface *iface) 219{ 220 if (evtimer_del(&iface->hello_timer) == -1) 221 fatal("if_stop_hello_timer"); 222} 223 224/* actions */ 225int 226if_act_start(struct iface *iface) 227{ 228 struct in_addr addr; 229 struct timeval now; 230 231 if (!((iface->flags & IFF_UP) && 232 LINK_STATE_IS_UP(iface->linkstate))) { 233 log_debug("if_act_start: interface %s link down", 234 iface->name); 235 return (0); 236 } 237 238 if (iface->media_type == IFT_CARP && iface->passive == 0) { 239 /* force passive mode on carp interfaces */ 240 log_warnx("if_act_start: forcing interface %s to passive", 241 iface->name); 242 iface->passive = 1; 243 } 244 245 gettimeofday(&now, NULL); 246 iface->uptime = now.tv_sec; 247 248 inet_aton(AllRouters, &addr); 249 if (if_join_group(iface, &addr)) 250 return (-1); 251 iface->state = IF_STA_ACTIVE; 252 253 /* hello timer needs to be started in any case */ 254 if_start_hello_timer(iface); 255 return (0); 256} 257 258int 259if_act_reset(struct iface *iface) 260{ 261 struct in_addr addr; 262 263 if_stop_hello_timer(iface); 264 265 inet_aton(AllRouters, &addr); 266 if (if_leave_group(iface, &addr)) { 267 log_warnx("if_act_reset: error leaving group %s, " 268 "interface %s", inet_ntoa(addr), iface->name); 269 } 270 return (0); 271} 272 273struct ctl_iface * 274if_to_ctl(struct iface *iface) 275{ 276 static struct ctl_iface ictl; 277 struct timeval tv, now, res; 278 279 memcpy(ictl.name, iface->name, sizeof(ictl.name)); 280 memcpy(&ictl.addr, &iface->addr, sizeof(ictl.addr)); 281 memcpy(&ictl.mask, &iface->mask, sizeof(ictl.mask)); 282 ictl.rtr_id.s_addr = ldpe_router_id(); 283 ictl.ifindex = iface->ifindex; 284 ictl.state = iface->state; 285 ictl.mtu = iface->mtu; 286 ictl.baudrate = iface->baudrate; 287 ictl.holdtime = iface->holdtime; 288 ictl.hello_interval = iface->hello_interval; 289 ictl.flags = iface->flags; 290 ictl.type = iface->type; 291 ictl.linkstate = iface->linkstate; 292 ictl.mediatype = iface->media_type; 293 ictl.priority = iface->priority; 294 ictl.passive = iface->passive; 295 296 gettimeofday(&now, NULL); 297 if (evtimer_pending(&iface->hello_timer, &tv)) { 298 timersub(&tv, &now, &res); 299 ictl.hello_timer = res.tv_sec; 300 } else 301 ictl.hello_timer = -1; 302 303 if (iface->state != IF_STA_DOWN && 304 iface->uptime != 0) { 305 ictl.uptime = now.tv_sec - iface->uptime; 306 } else 307 ictl.uptime = 0; 308 309 return (&ictl); 310} 311 312/* misc */ 313int 314if_set_mcast_ttl(int fd, u_int8_t ttl) 315{ 316 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, 317 (char *)&ttl, sizeof(ttl)) < 0) { 318 log_warn("if_set_mcast_ttl: error setting " 319 "IP_MULTICAST_TTL to %d", ttl); 320 return (-1); 321 } 322 323 return (0); 324} 325 326int 327if_set_tos(int fd, int tos) 328{ 329 if (setsockopt(fd, IPPROTO_IP, IP_TOS, (int *)&tos, sizeof(tos)) < 0) { 330 log_warn("if_set_tos: error setting IP_TOS to 0x%x", tos); 331 return (-1); 332 } 333 334 return (0); 335} 336 337int 338if_set_recvif(int fd, int enable) 339{ 340 if (setsockopt(fd, IPPROTO_IP, IP_RECVIF, &enable, 341 sizeof(enable)) < 0) { 342 log_warn("if_set_recvif: error setting IP_RECVIF"); 343 return (-1); 344 } 345 return (0); 346} 347 348void 349if_set_recvbuf(int fd) 350{ 351 int bsize; 352 353 bsize = 65535; 354 while (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &bsize, 355 sizeof(bsize)) == -1) 356 bsize /= 2; 357} 358 359int 360if_set_reuse(int fd, int enable) 361{ 362 if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &enable, 363 sizeof(int)) < 0) { 364 log_warn("if_set_reuse: error setting SO_REUSEADDR"); 365 return (-1); 366 } 367 368 return (0); 369} 370 371/* 372 * only one JOIN or DROP per interface and address is allowed so we need 373 * to keep track of what is added and removed. 374 */ 375struct if_group_count { 376 LIST_ENTRY(if_group_count) entry; 377 struct in_addr addr; 378 unsigned int ifindex; 379 int count; 380}; 381 382LIST_HEAD(,if_group_count) ifglist = LIST_HEAD_INITIALIZER(ifglist); 383 384int 385if_join_group(struct iface *iface, struct in_addr *addr) 386{ 387 struct ip_mreq mreq; 388 struct if_group_count *ifg; 389 390 LIST_FOREACH(ifg, &ifglist, entry) 391 if (iface->ifindex == ifg->ifindex && 392 addr->s_addr == ifg->addr.s_addr) 393 break; 394 if (ifg == NULL) { 395 if ((ifg = calloc(1, sizeof(*ifg))) == NULL) 396 fatal("if_join_group"); 397 ifg->addr.s_addr = addr->s_addr; 398 ifg->ifindex = iface->ifindex; 399 LIST_INSERT_HEAD(&ifglist, ifg, entry); 400 } 401 402 if (ifg->count++ != 0) 403 /* already joined */ 404 return (0); 405 406 mreq.imr_multiaddr.s_addr = addr->s_addr; 407 mreq.imr_interface.s_addr = iface->addr.s_addr; 408 409 if (setsockopt(iface->discovery_fd, IPPROTO_IP, 410 IP_ADD_MEMBERSHIP, (void *)&mreq, sizeof(mreq)) < 0) { 411 log_warn("if_join_group: error IP_ADD_MEMBERSHIP, " 412 "interface %s address %s", iface->name, 413 inet_ntoa(*addr)); 414 return (-1); 415 } 416 return (0); 417} 418 419int 420if_leave_group(struct iface *iface, struct in_addr *addr) 421{ 422 struct ip_mreq mreq; 423 struct if_group_count *ifg; 424 425 LIST_FOREACH(ifg, &ifglist, entry) 426 if (iface->ifindex == ifg->ifindex && 427 addr->s_addr == ifg->addr.s_addr) 428 break; 429 430 /* if interface is not found just try to drop membership */ 431 if (ifg && --ifg->count != 0) 432 /* others still joined */ 433 return (0); 434 435 mreq.imr_multiaddr.s_addr = addr->s_addr; 436 mreq.imr_interface.s_addr = iface->addr.s_addr; 437 438 if (setsockopt(iface->discovery_fd, IPPROTO_IP, 439 IP_DROP_MEMBERSHIP, (void *)&mreq, sizeof(mreq)) < 0) { 440 log_warn("if_leave_group: error IP_DROP_MEMBERSHIP, " 441 "interface %s address %s", iface->name, 442 inet_ntoa(*addr)); 443 return (-1); 444 } 445 446 if (ifg) { 447 LIST_REMOVE(ifg, entry); 448 free(ifg); 449 } 450 return (0); 451} 452 453int 454if_set_mcast(struct iface *iface) 455{ 456 if (setsockopt(iface->discovery_fd, IPPROTO_IP, IP_MULTICAST_IF, 457 &iface->addr.s_addr, sizeof(iface->addr.s_addr)) < 0) { 458 log_debug("if_set_mcast: error setting " 459 "IP_MULTICAST_IF, interface %s", iface->name); 460 return (-1); 461 } 462 463 return (0); 464} 465 466int 467if_set_mcast_loop(int fd) 468{ 469 u_int8_t loop = 0; 470 471 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, 472 (char *)&loop, sizeof(loop)) < 0) { 473 log_warn("if_set_mcast_loop: error setting IP_MULTICAST_LOOP"); 474 return (-1); 475 } 476 477 return (0); 478} 479