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