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