1 /* $KAME: if.c,v 1.15 2001/05/22 06:04:17 jinmei Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $FreeBSD$ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/socket.h> 36 #include <sys/sysctl.h> 37 #include <sys/ioctl.h> 38 #include <sys/queue.h> 39 40 #include <net/if.h> 41 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 42 #include <net/if_var.h> 43 #endif /* __FreeBSD__ >= 3 */ 44 #include <net/if_types.h> 45 #include <net/route.h> 46 #include <net/if_dl.h> 47 #include <net/if_media.h> 48 #ifdef __FreeBSD__ 49 # include <net/ethernet.h> 50 #endif 51 #ifdef __NetBSD__ 52 #include <net/if_ether.h> 53 #endif 54 #if defined(__bsdi__) || defined(__OpenBSD__) 55 # include <netinet/in.h> 56 # include <netinet/if_ether.h> 57 #endif 58 #include <netinet/in.h> 59 #include <netinet/icmp6.h> 60 61 #include <netinet6/in6_var.h> 62 63 #include <stdio.h> 64 #include <unistd.h> 65 #include <stdlib.h> 66 #include <syslog.h> 67 #include <string.h> 68 #include <fcntl.h> 69 #include <errno.h> 70 #include <limits.h> 71 #ifdef HAVE_GETIFADDRS 72 #include <ifaddrs.h> 73 #endif 74 75 #include "rtsold.h" 76 77 extern int rssock; 78 static int ifsock; 79 80 static int get_llflag __P((const char *name)); 81 #ifndef HAVE_GETIFADDRS 82 static unsigned int if_maxindex __P((void)); 83 #endif 84 static void get_rtaddrs __P((int addrs, struct sockaddr *sa, 85 struct sockaddr **rti_info)); 86 87 int 88 ifinit() 89 { 90 ifsock = rssock; 91 92 return(0); 93 } 94 95 int 96 interface_up(char *name) 97 { 98 struct ifreq ifr; 99 int llflag; 100 101 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 102 103 if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { 104 warnmsg(LOG_WARNING, __FUNCTION__, "ioctl(SIOCGIFFLAGS): %s", 105 strerror(errno)); 106 return(-1); 107 } 108 if (!(ifr.ifr_flags & IFF_UP)) { 109 ifr.ifr_flags |= IFF_UP; 110 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) { 111 warnmsg(LOG_ERR, __FUNCTION__, 112 "ioctl(SIOCSIFFLAGS): %s", strerror(errno)); 113 } 114 return(-1); 115 } 116 117 warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name); 118 119 llflag = get_llflag(name); 120 if (llflag < 0) { 121 warnmsg(LOG_WARNING, __FUNCTION__, 122 "get_llflag() failed, anyway I'll try"); 123 return 0; 124 } 125 126 if (!(llflag & IN6_IFF_NOTREADY)) { 127 warnmsg(LOG_DEBUG, __FUNCTION__, 128 "%s is ready", name); 129 return(0); 130 } else { 131 if (llflag & IN6_IFF_TENTATIVE) { 132 warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative", 133 name); 134 return IFS_TENTATIVE; 135 } 136 if (llflag & IN6_IFF_DUPLICATED) 137 warnmsg(LOG_DEBUG, __FUNCTION__, "%s is duplicated", 138 name); 139 return -1; 140 } 141 } 142 143 int 144 interface_status(struct ifinfo *ifinfo) 145 { 146 char *ifname = ifinfo->ifname; 147 struct ifreq ifr; 148 struct ifmediareq ifmr; 149 150 /* get interface flags */ 151 memset(&ifr, 0, sizeof(ifr)); 152 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 153 if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { 154 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFFLAGS) on %s: %s", 155 ifname, strerror(errno)); 156 return(-1); 157 } 158 /* 159 * if one of UP and RUNNING flags is dropped, 160 * the interface is not active. 161 */ 162 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 163 goto inactive; 164 } 165 166 /* Next, check carrier on the interface, if possible */ 167 if (!ifinfo->mediareqok) 168 goto active; 169 memset(&ifmr, 0, sizeof(ifmr)); 170 strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 171 172 if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { 173 if (errno != EINVAL) { 174 warnmsg(LOG_DEBUG, __FUNCTION__, 175 "ioctl(SIOCGIFMEDIA) on %s: %s", 176 ifname, strerror(errno)); 177 return(-1); 178 } 179 /* 180 * EINVAL simply means that the interface does not support 181 * the SIOCGIFMEDIA ioctl. We regard it alive. 182 */ 183 ifinfo->mediareqok = 0; 184 goto active; 185 } 186 187 if (ifmr.ifm_status & IFM_AVALID) { 188 switch(ifmr.ifm_active & IFM_NMASK) { 189 case IFM_ETHER: 190 if (ifmr.ifm_status & IFM_ACTIVE) 191 goto active; 192 else 193 goto inactive; 194 break; 195 default: 196 goto inactive; 197 } 198 } 199 200 inactive: 201 return(0); 202 203 active: 204 return(1); 205 } 206 207 #define ROUNDUP(a, size) \ 208 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 209 210 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 211 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\ 212 sizeof(u_long)) :\ 213 sizeof(u_long))) 214 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 215 216 int 217 lladdropt_length(struct sockaddr_dl *sdl) 218 { 219 switch(sdl->sdl_type) { 220 case IFT_ETHER: 221 #ifdef IFT_IEEE80211 222 case IFT_IEEE80211: 223 #endif 224 return(ROUNDUP8(ETHER_ADDR_LEN + 2)); 225 default: 226 return(0); 227 } 228 } 229 230 void 231 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 232 { 233 char *addr; 234 235 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 236 237 switch(sdl->sdl_type) { 238 case IFT_ETHER: 239 #ifdef IFT_IEEE80211 240 case IFT_IEEE80211: 241 #endif 242 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 243 addr = (char *)(ndopt + 1); 244 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 245 break; 246 default: 247 warnmsg(LOG_ERR, __FUNCTION__, 248 "unsupported link type(%d)", sdl->sdl_type); 249 exit(1); 250 } 251 252 return; 253 } 254 255 struct sockaddr_dl * 256 if_nametosdl(char *name) 257 { 258 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 259 char *buf, *next, *lim; 260 size_t len; 261 struct if_msghdr *ifm; 262 struct sockaddr *sa, *rti_info[RTAX_MAX]; 263 struct sockaddr_dl *sdl = NULL, *ret_sdl; 264 265 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 266 return(NULL); 267 if ((buf = malloc(len)) == NULL) 268 return(NULL); 269 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 270 free(buf); 271 return(NULL); 272 } 273 274 lim = buf + len; 275 for (next = buf; next < lim; next += ifm->ifm_msglen) { 276 ifm = (struct if_msghdr *)next; 277 if (ifm->ifm_type == RTM_IFINFO) { 278 sa = (struct sockaddr *)(ifm + 1); 279 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 280 if ((sa = rti_info[RTAX_IFP]) != NULL) { 281 if (sa->sa_family == AF_LINK) { 282 sdl = (struct sockaddr_dl *)sa; 283 if (strlen(name) != sdl->sdl_nlen) 284 continue; /* not same len */ 285 if (strncmp(&sdl->sdl_data[0], 286 name, 287 sdl->sdl_nlen) == 0) { 288 break; 289 } 290 } 291 } 292 } 293 } 294 if (next == lim) { 295 /* search failed */ 296 free(buf); 297 return(NULL); 298 } 299 300 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) 301 return(NULL); 302 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 303 304 free(buf); 305 return(ret_sdl); 306 } 307 308 int 309 getinet6sysctl(int code) 310 { 311 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 312 int value; 313 size_t size; 314 315 mib[3] = code; 316 size = sizeof(value); 317 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0) 318 return -1; 319 else 320 return value; 321 } 322 323 /*------------------------------------------------------------*/ 324 325 /* get ia6_flags for link-local addr on if. returns -1 on error. */ 326 static int 327 get_llflag(const char *name) 328 { 329 #ifdef HAVE_GETIFADDRS 330 struct ifaddrs *ifap, *ifa; 331 struct in6_ifreq ifr6; 332 struct sockaddr_in6 *sin6; 333 int s; 334 335 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 336 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s", 337 strerror(errno)); 338 exit(1); 339 } 340 if (getifaddrs(&ifap) != 0) { 341 warnmsg(LOG_ERR, __FUNCTION__, "etifaddrs: %s", 342 strerror(errno)); 343 exit(1); 344 } 345 346 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 347 if (strlen(ifa->ifa_name) != strlen(name) 348 || strncmp(ifa->ifa_name, name, strlen(name)) != 0) 349 continue; 350 if (ifa->ifa_addr->sa_family != AF_INET6) 351 continue; 352 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 353 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 354 continue; 355 356 memset(&ifr6, 0, sizeof(ifr6)); 357 strcpy(ifr6.ifr_name, name); 358 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 359 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 360 warnmsg(LOG_ERR, __FUNCTION__, 361 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 362 exit(1); 363 } 364 365 freeifaddrs(ifap); 366 close(s); 367 return ifr6.ifr_ifru.ifru_flags6; 368 } 369 370 freeifaddrs(ifap); 371 close(s); 372 return -1; 373 #else 374 int s; 375 unsigned int maxif; 376 struct ifreq *iflist; 377 struct ifconf ifconf; 378 struct ifreq *ifr, *ifr_end; 379 struct sockaddr_in6 *sin6; 380 struct in6_ifreq ifr6; 381 382 maxif = if_maxindex() + 1; 383 iflist = (struct ifreq *)malloc(maxif * BUFSIZ); /* XXX */ 384 if (iflist == NULL) { 385 warnmsg(LOG_ERR, __FUNCTION__, "not enough core"); 386 exit(1); 387 } 388 389 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 390 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s", 391 strerror(errno)); 392 exit(1); 393 } 394 memset(&ifconf, 0, sizeof(ifconf)); 395 ifconf.ifc_req = iflist; 396 ifconf.ifc_len = maxif * BUFSIZ; /* XXX */ 397 if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) { 398 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFCONF): %s", 399 strerror(errno)); 400 exit(1); 401 } 402 403 /* Look for this interface in the list */ 404 ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len); 405 for (ifr = ifconf.ifc_req; 406 ifr < ifr_end; 407 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr 408 + ifr->ifr_addr.sa_len)) { 409 if (strlen(ifr->ifr_name) != strlen(name) 410 || strncmp(ifr->ifr_name, name, strlen(name)) != 0) 411 continue; 412 if (ifr->ifr_addr.sa_family != AF_INET6) 413 continue; 414 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr; 415 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 416 continue; 417 418 memset(&ifr6, 0, sizeof(ifr6)); 419 strcpy(ifr6.ifr_name, name); 420 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 421 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 422 warnmsg(LOG_ERR, __FUNCTION__, 423 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 424 exit(1); 425 } 426 427 free(iflist); 428 close(s); 429 return ifr6.ifr_ifru.ifru_flags6; 430 } 431 432 free(iflist); 433 close(s); 434 return -1; 435 #endif 436 } 437 438 #ifndef HAVE_GETIFADDRS 439 static unsigned int 440 if_maxindex() 441 { 442 struct if_nameindex *p, *p0; 443 unsigned int max = 0; 444 445 p0 = if_nameindex(); 446 for (p = p0; p && p->if_index && p->if_name; p++) { 447 if (max < p->if_index) 448 max = p->if_index; 449 } 450 if_freenameindex(p0); 451 return max; 452 } 453 #endif 454 455 static void 456 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 457 { 458 int i; 459 460 for (i = 0; i < RTAX_MAX; i++) { 461 if (addrs & (1 << i)) { 462 rti_info[i] = sa; 463 NEXT_SA(sa); 464 } 465 else 466 rti_info[i] = NULL; 467 } 468 } 469