1 /* $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun 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 #include <net/if_var.h> 42 #include <net/if_types.h> 43 #include <net/route.h> 44 #include <net/if_dl.h> 45 #include <net/if_media.h> 46 #include <net/ethernet.h> 47 #include <netinet/in.h> 48 #include <netinet/icmp6.h> 49 50 #include <netinet6/in6_var.h> 51 #include <netinet6/nd6.h> 52 53 #include <stdio.h> 54 #include <unistd.h> 55 #include <stdlib.h> 56 #include <syslog.h> 57 #include <string.h> 58 #include <fcntl.h> 59 #include <errno.h> 60 #include <limits.h> 61 #include <ifaddrs.h> 62 #include "rtsold.h" 63 64 extern int rssock; 65 static int ifsock; 66 67 static int get_llflag(const char *); 68 static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **); 69 70 int 71 ifinit(void) 72 { 73 ifsock = rssock; 74 75 return(0); 76 } 77 78 int 79 interface_up(char *name) 80 { 81 struct ifreq ifr; 82 struct in6_ndireq nd; 83 int llflag; 84 int s; 85 int error; 86 87 memset(&ifr, 0, sizeof(ifr)); 88 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 89 memset(&nd, 0, sizeof(nd)); 90 strlcpy(nd.ifname, name, sizeof(nd.ifname)); 91 92 if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { 93 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s", 94 strerror(errno)); 95 return(-1); 96 } 97 if (!(ifr.ifr_flags & IFF_UP)) { 98 ifr.ifr_flags |= IFF_UP; 99 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) 100 warnmsg(LOG_ERR, __func__, 101 "ioctl(SIOCSIFFLAGS): %s", strerror(errno)); 102 return(-1); 103 } 104 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 105 warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s", 106 strerror(errno)); 107 return(-1); 108 } 109 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) { 110 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s", 111 strerror(errno)); 112 close(s); 113 return(-1); 114 } 115 116 warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name); 117 118 if (nd.ndi.flags & ND6_IFF_IFDISABLED) { 119 if (Fflag) { 120 nd.ndi.flags &= ~ND6_IFF_IFDISABLED; 121 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) { 122 warnmsg(LOG_WARNING, __func__, 123 "ioctl(SIOCSIFINFO_IN6): %s", 124 strerror(errno)); 125 close(s); 126 return(-1); 127 } 128 } else { 129 warnmsg(LOG_WARNING, __func__, 130 "%s is disabled.", name); 131 close(s); 132 return(-1); 133 } 134 } 135 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) { 136 if (Fflag) { 137 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV; 138 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) { 139 warnmsg(LOG_WARNING, __func__, 140 "ioctl(SIOCSIFINFO_IN6): %s", 141 strerror(errno)); 142 close(s); 143 return(-1); 144 } 145 } else { 146 warnmsg(LOG_WARNING, __func__, 147 "%s does not accept Router Advertisement.", name); 148 close(s); 149 return(-1); 150 } 151 } 152 close(s); 153 154 llflag = get_llflag(name); 155 if (llflag < 0) { 156 warnmsg(LOG_WARNING, __func__, 157 "get_llflag() failed, anyway I'll try"); 158 return 0; 159 } 160 161 if (!(llflag & IN6_IFF_NOTREADY)) { 162 warnmsg(LOG_DEBUG, __func__, "%s is ready", name); 163 return(0); 164 } else { 165 if (llflag & IN6_IFF_TENTATIVE) { 166 warnmsg(LOG_DEBUG, __func__, "%s is tentative", 167 name); 168 return IFS_TENTATIVE; 169 } 170 if (llflag & IN6_IFF_DUPLICATED) 171 warnmsg(LOG_DEBUG, __func__, "%s is duplicated", 172 name); 173 return -1; 174 } 175 } 176 177 int 178 interface_status(struct ifinfo *ifinfo) 179 { 180 char *ifname = ifinfo->ifname; 181 struct ifreq ifr; 182 struct ifmediareq ifmr; 183 184 /* get interface flags */ 185 memset(&ifr, 0, sizeof(ifr)); 186 strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 187 if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) { 188 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s", 189 ifname, strerror(errno)); 190 return(-1); 191 } 192 /* 193 * if one of UP and RUNNING flags is dropped, 194 * the interface is not active. 195 */ 196 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 197 goto inactive; 198 } 199 200 /* Next, check carrier on the interface, if possible */ 201 if (!ifinfo->mediareqok) 202 goto active; 203 memset(&ifmr, 0, sizeof(ifmr)); 204 strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 205 206 if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { 207 if (errno != EINVAL) { 208 warnmsg(LOG_DEBUG, __func__, 209 "ioctl(SIOCGIFMEDIA) on %s: %s", 210 ifname, strerror(errno)); 211 return(-1); 212 } 213 /* 214 * EINVAL simply means that the interface does not support 215 * the SIOCGIFMEDIA ioctl. We regard it alive. 216 */ 217 ifinfo->mediareqok = 0; 218 goto active; 219 } 220 221 if (ifmr.ifm_status & IFM_AVALID) { 222 switch (ifmr.ifm_active & IFM_NMASK) { 223 case IFM_ETHER: 224 case IFM_IEEE80211: 225 if (ifmr.ifm_status & IFM_ACTIVE) 226 goto active; 227 else 228 goto inactive; 229 break; 230 default: 231 goto inactive; 232 } 233 } 234 235 inactive: 236 return(0); 237 238 active: 239 return(1); 240 } 241 242 #define ROUNDUP(a, size) \ 243 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 244 245 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 246 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\ 247 sizeof(u_long)) : sizeof(u_long))) 248 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 249 250 int 251 lladdropt_length(struct sockaddr_dl *sdl) 252 { 253 switch (sdl->sdl_type) { 254 case IFT_ETHER: 255 #ifdef IFT_IEEE80211 256 case IFT_IEEE80211: 257 #endif 258 return(ROUNDUP8(ETHER_ADDR_LEN + 2)); 259 default: 260 return(0); 261 } 262 } 263 264 void 265 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 266 { 267 char *addr; 268 269 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 270 271 switch (sdl->sdl_type) { 272 case IFT_ETHER: 273 #ifdef IFT_IEEE80211 274 case IFT_IEEE80211: 275 #endif 276 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 277 addr = (char *)(ndopt + 1); 278 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 279 break; 280 default: 281 warnmsg(LOG_ERR, __func__, 282 "unsupported link type(%d)", sdl->sdl_type); 283 exit(1); 284 } 285 286 return; 287 } 288 289 struct sockaddr_dl * 290 if_nametosdl(char *name) 291 { 292 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 293 char *buf, *next, *lim; 294 size_t len; 295 struct if_msghdr *ifm; 296 struct sockaddr *sa, *rti_info[RTAX_MAX]; 297 struct sockaddr_dl *sdl = NULL, *ret_sdl; 298 299 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 300 return(NULL); 301 if ((buf = malloc(len)) == NULL) 302 return(NULL); 303 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 304 free(buf); 305 return(NULL); 306 } 307 308 lim = buf + len; 309 for (next = buf; next < lim; next += ifm->ifm_msglen) { 310 ifm = (struct if_msghdr *)next; 311 if (ifm->ifm_type == RTM_IFINFO) { 312 sa = (struct sockaddr *)(ifm + 1); 313 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 314 if ((sa = rti_info[RTAX_IFP]) != NULL) { 315 if (sa->sa_family == AF_LINK) { 316 sdl = (struct sockaddr_dl *)sa; 317 if (strlen(name) != sdl->sdl_nlen) 318 continue; /* not same len */ 319 if (strncmp(&sdl->sdl_data[0], 320 name, 321 sdl->sdl_nlen) == 0) { 322 break; 323 } 324 } 325 } 326 } 327 } 328 if (next == lim) { 329 /* search failed */ 330 free(buf); 331 return(NULL); 332 } 333 334 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) { 335 free(buf); 336 return(NULL); 337 } 338 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 339 340 free(buf); 341 return(ret_sdl); 342 } 343 344 int 345 getinet6sysctl(int code) 346 { 347 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 348 int value; 349 size_t size; 350 351 mib[3] = code; 352 size = sizeof(value); 353 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0) 354 return -1; 355 else 356 return value; 357 } 358 359 int 360 setinet6sysctl(int code, int newval) 361 { 362 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 363 int value; 364 size_t size; 365 366 mib[3] = code; 367 size = sizeof(value); 368 if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, 369 &newval, sizeof(newval)) < 0) 370 return -1; 371 else 372 return value; 373 } 374 375 /*------------------------------------------------------------*/ 376 377 /* get ia6_flags for link-local addr on if. returns -1 on error. */ 378 static int 379 get_llflag(const char *name) 380 { 381 struct ifaddrs *ifap, *ifa; 382 struct in6_ifreq ifr6; 383 struct sockaddr_in6 *sin6; 384 int s; 385 386 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 387 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s", 388 strerror(errno)); 389 exit(1); 390 } 391 if (getifaddrs(&ifap) != 0) { 392 warnmsg(LOG_ERR, __func__, "getifaddrs: %s", 393 strerror(errno)); 394 exit(1); 395 } 396 397 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 398 if (strlen(ifa->ifa_name) != strlen(name) || 399 strncmp(ifa->ifa_name, name, strlen(name)) != 0) 400 continue; 401 if (ifa->ifa_addr->sa_family != AF_INET6) 402 continue; 403 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr; 404 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 405 continue; 406 407 memset(&ifr6, 0, sizeof(ifr6)); 408 strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name)); 409 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 410 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 411 warnmsg(LOG_ERR, __func__, 412 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 413 exit(1); 414 } 415 416 freeifaddrs(ifap); 417 close(s); 418 return ifr6.ifr_ifru.ifru_flags6; 419 } 420 421 freeifaddrs(ifap); 422 close(s); 423 return -1; 424 } 425 426 427 static void 428 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 429 { 430 int i; 431 432 for (i = 0; i < RTAX_MAX; i++) { 433 if (addrs & (1 << i)) { 434 rti_info[i] = sa; 435 NEXT_SA(sa); 436 } else 437 rti_info[i] = NULL; 438 } 439 } 440