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: src/usr.sbin/rtsold/if.c,v 1.2.2.3 2001/07/03 11:02:16 ume Exp $ 32 * $DragonFly: src/usr.sbin/rtsold/if.c,v 1.6 2005/12/05 00:56:37 swildner Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/socket.h> 37 #include <sys/sysctl.h> 38 #include <sys/ioctl.h> 39 #include <sys/queue.h> 40 41 #include <net/if.h> 42 #if defined(__DragonFly__) 43 #include <net/if_var.h> 44 #endif /* __DragonFly__ >= 3 */ 45 #include <net/if_types.h> 46 #include <net/route.h> 47 #include <net/if_dl.h> 48 #include <net/if_media.h> 49 #ifdef __DragonFly__ 50 # include <net/ethernet.h> 51 #endif 52 #ifdef __NetBSD__ 53 #include <net/if_ether.h> 54 #endif 55 #if defined(__bsdi__) || defined(__OpenBSD__) 56 # include <netinet/in.h> 57 # include <netinet/if_ether.h> 58 #endif 59 #include <netinet/in.h> 60 #include <netinet/icmp6.h> 61 62 #include <netinet6/in6_var.h> 63 64 #include <stdio.h> 65 #include <unistd.h> 66 #include <stdlib.h> 67 #include <syslog.h> 68 #include <string.h> 69 #include <fcntl.h> 70 #include <errno.h> 71 #include <limits.h> 72 #ifdef HAVE_GETIFADDRS 73 #include <ifaddrs.h> 74 #endif 75 76 #include "rtsold.h" 77 78 extern int rssock; 79 static int ifsock; 80 81 static int get_llflag(const char *name); 82 #ifndef HAVE_GETIFADDRS 83 static unsigned int if_maxindex(void); 84 #endif 85 static void get_rtaddrs(int addrs, struct sockaddr *sa, 86 struct sockaddr **rti_info); 87 88 int 89 ifinit(void) 90 { 91 ifsock = rssock; 92 93 return(0); 94 } 95 96 int 97 interface_up(char *name) 98 { 99 struct ifreq ifr; 100 int llflag; 101 102 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 103 104 if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { 105 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s", 106 strerror(errno)); 107 return(-1); 108 } 109 if (!(ifr.ifr_flags & IFF_UP)) { 110 ifr.ifr_flags |= IFF_UP; 111 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) { 112 warnmsg(LOG_ERR, __func__, 113 "ioctl(SIOCSIFFLAGS): %s", strerror(errno)); 114 } 115 return(-1); 116 } 117 118 warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name); 119 120 llflag = get_llflag(name); 121 if (llflag < 0) { 122 warnmsg(LOG_WARNING, __func__, 123 "get_llflag() failed, anyway I'll try"); 124 return 0; 125 } 126 127 if (!(llflag & IN6_IFF_NOTREADY)) { 128 warnmsg(LOG_DEBUG, __func__, 129 "%s is ready", name); 130 return(0); 131 } else { 132 if (llflag & IN6_IFF_TENTATIVE) { 133 warnmsg(LOG_DEBUG, __func__, "%s is tentative", 134 name); 135 return IFS_TENTATIVE; 136 } 137 if (llflag & IN6_IFF_DUPLICATED) 138 warnmsg(LOG_DEBUG, __func__, "%s is duplicated", 139 name); 140 return -1; 141 } 142 } 143 144 int 145 interface_status(struct ifinfo *ifinfo) 146 { 147 char *ifname = ifinfo->ifname; 148 struct ifreq ifr; 149 struct ifmediareq ifmr; 150 151 /* get interface flags */ 152 memset(&ifr, 0, sizeof(ifr)); 153 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 154 if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { 155 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s", 156 ifname, strerror(errno)); 157 return(-1); 158 } 159 /* 160 * if one of UP and RUNNING flags is dropped, 161 * the interface is not active. 162 */ 163 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 164 goto inactive; 165 } 166 167 /* Next, check carrier on the interface, if possible */ 168 if (!ifinfo->mediareqok) 169 goto active; 170 memset(&ifmr, 0, sizeof(ifmr)); 171 strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 172 173 if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { 174 if (errno != EINVAL) { 175 warnmsg(LOG_DEBUG, __func__, 176 "ioctl(SIOCGIFMEDIA) on %s: %s", 177 ifname, strerror(errno)); 178 return(-1); 179 } 180 /* 181 * EINVAL simply means that the interface does not support 182 * the SIOCGIFMEDIA ioctl. We regard it alive. 183 */ 184 ifinfo->mediareqok = 0; 185 goto active; 186 } 187 188 if (ifmr.ifm_status & IFM_AVALID) { 189 switch(ifmr.ifm_active & IFM_NMASK) { 190 case IFM_ETHER: 191 if (ifmr.ifm_status & IFM_ACTIVE) 192 goto active; 193 else 194 goto inactive; 195 break; 196 default: 197 goto inactive; 198 } 199 } 200 201 inactive: 202 return(0); 203 204 active: 205 return(1); 206 } 207 208 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 209 210 int 211 lladdropt_length(struct sockaddr_dl *sdl) 212 { 213 switch(sdl->sdl_type) { 214 case IFT_ETHER: 215 #ifdef IFT_IEEE80211 216 case IFT_IEEE80211: 217 #endif 218 return(ROUNDUP8(ETHER_ADDR_LEN + 2)); 219 default: 220 return(0); 221 } 222 } 223 224 void 225 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 226 { 227 char *addr; 228 229 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 230 231 switch(sdl->sdl_type) { 232 case IFT_ETHER: 233 #ifdef IFT_IEEE80211 234 case IFT_IEEE80211: 235 #endif 236 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 237 addr = (char *)(ndopt + 1); 238 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 239 break; 240 default: 241 warnmsg(LOG_ERR, __func__, 242 "unsupported link type(%d)", sdl->sdl_type); 243 exit(1); 244 } 245 246 return; 247 } 248 249 struct sockaddr_dl * 250 if_nametosdl(char *name) 251 { 252 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 253 char *buf, *next, *lim; 254 size_t len; 255 struct if_msghdr *ifm; 256 struct sockaddr *sa, *rti_info[RTAX_MAX]; 257 struct sockaddr_dl *sdl = NULL, *ret_sdl; 258 259 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 260 return(NULL); 261 if ((buf = malloc(len)) == NULL) 262 return(NULL); 263 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 264 free(buf); 265 return(NULL); 266 } 267 268 lim = buf + len; 269 for (next = buf; next < lim; next += ifm->ifm_msglen) { 270 ifm = (struct if_msghdr *)next; 271 if (ifm->ifm_type == RTM_IFINFO) { 272 sa = (struct sockaddr *)(ifm + 1); 273 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 274 if ((sa = rti_info[RTAX_IFP]) != NULL) { 275 if (sa->sa_family == AF_LINK) { 276 sdl = (struct sockaddr_dl *)sa; 277 if (strlen(name) != sdl->sdl_nlen) 278 continue; /* not same len */ 279 if (strncmp(&sdl->sdl_data[0], 280 name, 281 sdl->sdl_nlen) == 0) { 282 break; 283 } 284 } 285 } 286 } 287 } 288 if (next == lim) { 289 /* search failed */ 290 free(buf); 291 return(NULL); 292 } 293 294 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) 295 return(NULL); 296 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 297 298 free(buf); 299 return(ret_sdl); 300 } 301 302 int 303 getinet6sysctl(int code) 304 { 305 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 306 int value; 307 size_t size; 308 309 mib[3] = code; 310 size = sizeof(value); 311 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0) 312 return -1; 313 else 314 return value; 315 } 316 317 /*------------------------------------------------------------*/ 318 319 /* get ia6_flags for link-local addr on if. returns -1 on error. */ 320 static int 321 get_llflag(const char *name) 322 { 323 #ifdef HAVE_GETIFADDRS 324 struct ifaddrs *ifap, *ifa; 325 struct in6_ifreq ifr6; 326 struct sockaddr_in6 *sin6; 327 int s; 328 329 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 330 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s", 331 strerror(errno)); 332 exit(1); 333 } 334 if (getifaddrs(&ifap) != 0) { 335 warnmsg(LOG_ERR, __func__, "etifaddrs: %s", 336 strerror(errno)); 337 exit(1); 338 } 339 340 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 341 if (strlen(ifa->ifa_name) != strlen(name) 342 || strncmp(ifa->ifa_name, name, strlen(name)) != 0) 343 continue; 344 if (ifa->ifa_addr->sa_family != AF_INET6) 345 continue; 346 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 347 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 348 continue; 349 350 memset(&ifr6, 0, sizeof(ifr6)); 351 strcpy(ifr6.ifr_name, name); 352 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 353 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 354 warnmsg(LOG_ERR, __func__, 355 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 356 exit(1); 357 } 358 359 freeifaddrs(ifap); 360 close(s); 361 return ifr6.ifr_ifru.ifru_flags6; 362 } 363 364 freeifaddrs(ifap); 365 close(s); 366 return -1; 367 #else 368 int s; 369 unsigned int maxif; 370 struct ifreq *iflist; 371 struct ifconf ifconf; 372 struct ifreq *ifr, *ifr_end; 373 struct sockaddr_in6 *sin6; 374 struct in6_ifreq ifr6; 375 376 maxif = if_maxindex() + 1; 377 iflist = (struct ifreq *)malloc(maxif * BUFSIZ); /* XXX */ 378 if (iflist == NULL) { 379 warnmsg(LOG_ERR, __func__, "not enough core"); 380 exit(1); 381 } 382 383 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 384 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s", 385 strerror(errno)); 386 exit(1); 387 } 388 memset(&ifconf, 0, sizeof(ifconf)); 389 ifconf.ifc_req = iflist; 390 ifconf.ifc_len = maxif * BUFSIZ; /* XXX */ 391 if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) { 392 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFCONF): %s", 393 strerror(errno)); 394 exit(1); 395 } 396 397 /* Look for this interface in the list */ 398 ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len); 399 for (ifr = ifconf.ifc_req; 400 ifr < ifr_end; 401 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr 402 + ifr->ifr_addr.sa_len)) { 403 if (strlen(ifr->ifr_name) != strlen(name) 404 || strncmp(ifr->ifr_name, name, strlen(name)) != 0) 405 continue; 406 if (ifr->ifr_addr.sa_family != AF_INET6) 407 continue; 408 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr; 409 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 410 continue; 411 412 memset(&ifr6, 0, sizeof(ifr6)); 413 strcpy(ifr6.ifr_name, name); 414 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 415 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 416 warnmsg(LOG_ERR, __func__, 417 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 418 exit(1); 419 } 420 421 free(iflist); 422 close(s); 423 return ifr6.ifr_ifru.ifru_flags6; 424 } 425 426 free(iflist); 427 close(s); 428 return -1; 429 #endif 430 } 431 432 #ifndef HAVE_GETIFADDRS 433 static unsigned int 434 if_maxindex(void) 435 { 436 struct if_nameindex *p, *p0; 437 unsigned int max = 0; 438 439 p0 = if_nameindex(); 440 for (p = p0; p && p->if_index && p->if_name; p++) { 441 if (max < p->if_index) 442 max = p->if_index; 443 } 444 if_freenameindex(p0); 445 return max; 446 } 447 #endif 448 449 static void 450 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 451 { 452 int i; 453 454 for (i = 0; i < RTAX_MAX; i++) { 455 if (addrs & (1 << i)) { 456 rti_info[i] = sa; 457 RT_ADVANCE(sa, sa); 458 } 459 else 460 rti_info[i] = NULL; 461 } 462 } 463