1 /* $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $FreeBSD$ 34 */ 35 36 #include <sys/param.h> 37 #include <sys/socket.h> 38 #include <sys/sysctl.h> 39 #include <sys/ioctl.h> 40 #include <sys/queue.h> 41 42 #include <net/if.h> 43 #include <net/if_types.h> 44 #include <net/route.h> 45 #include <net/if_dl.h> 46 #include <net/if_media.h> 47 #include <net/ethernet.h> 48 #include <netinet/in.h> 49 #include <netinet/icmp6.h> 50 51 #include <netinet6/in6_var.h> 52 #include <netinet6/nd6.h> 53 54 #include <stdio.h> 55 #include <unistd.h> 56 #include <stdlib.h> 57 #include <syslog.h> 58 #include <string.h> 59 #include <fcntl.h> 60 #include <errno.h> 61 #include <limits.h> 62 #include <ifaddrs.h> 63 #include "rtsold.h" 64 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 strlcpy(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 strlcpy(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 /* Next, check carrier on the interface, if possible */ 198 if (!ifinfo->mediareqok) 199 goto active; 200 memset(&ifmr, 0, sizeof(ifmr)); 201 strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name)); 202 203 if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) { 204 if (errno != EINVAL) { 205 warnmsg(LOG_DEBUG, __func__, 206 "ioctl(SIOCGIFMEDIA) on %s: %s", 207 ifname, strerror(errno)); 208 return(-1); 209 } 210 /* 211 * EINVAL simply means that the interface does not support 212 * the SIOCGIFMEDIA ioctl. We regard it alive. 213 */ 214 ifinfo->mediareqok = 0; 215 goto active; 216 } 217 218 if (ifmr.ifm_status & IFM_AVALID) { 219 switch (ifmr.ifm_active & IFM_NMASK) { 220 case IFM_ETHER: 221 case IFM_IEEE80211: 222 if (ifmr.ifm_status & IFM_ACTIVE) 223 goto active; 224 else 225 goto inactive; 226 break; 227 default: 228 goto inactive; 229 } 230 } 231 232 inactive: 233 return (0); 234 235 active: 236 return (1); 237 } 238 239 #define ROUNDUP(a, size) \ 240 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 241 242 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 243 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\ 244 sizeof(u_long)) : sizeof(u_long))) 245 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 246 247 int 248 lladdropt_length(struct sockaddr_dl *sdl) 249 { 250 switch (sdl->sdl_type) { 251 case IFT_ETHER: 252 return (ROUNDUP8(ETHER_ADDR_LEN + 2)); 253 default: 254 return (0); 255 } 256 } 257 258 void 259 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 260 { 261 char *addr; 262 263 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 264 265 switch (sdl->sdl_type) { 266 case IFT_ETHER: 267 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 268 addr = (char *)(ndopt + 1); 269 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 270 break; 271 default: 272 warnmsg(LOG_ERR, __func__, 273 "unsupported link type(%d)", sdl->sdl_type); 274 exit(1); 275 } 276 277 return; 278 } 279 280 struct sockaddr_dl * 281 if_nametosdl(char *name) 282 { 283 int mib[] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 284 char *buf, *next, *lim; 285 size_t len; 286 struct if_msghdr *ifm; 287 struct sockaddr *sa, *rti_info[RTAX_MAX]; 288 struct sockaddr_dl *sdl = NULL, *ret_sdl; 289 290 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0) 291 return(NULL); 292 if ((buf = malloc(len)) == NULL) 293 return(NULL); 294 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) < 0) { 295 free(buf); 296 return (NULL); 297 } 298 299 lim = buf + len; 300 for (next = buf; next < lim; next += ifm->ifm_msglen) { 301 ifm = (struct if_msghdr *)(void *)next; 302 if (ifm->ifm_type == RTM_IFINFO) { 303 sa = (struct sockaddr *)(ifm + 1); 304 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 305 if ((sa = rti_info[RTAX_IFP]) != NULL) { 306 if (sa->sa_family == AF_LINK) { 307 sdl = (struct sockaddr_dl *)(void *)sa; 308 if (strlen(name) != sdl->sdl_nlen) 309 continue; /* not same len */ 310 if (strncmp(&sdl->sdl_data[0], 311 name, 312 sdl->sdl_nlen) == 0) { 313 break; 314 } 315 } 316 } 317 } 318 } 319 if (next == lim) { 320 /* search failed */ 321 free(buf); 322 return (NULL); 323 } 324 325 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) { 326 free(buf); 327 return (NULL); 328 } 329 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 330 331 free(buf); 332 return (ret_sdl); 333 } 334 335 int 336 getinet6sysctl(int code) 337 { 338 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 339 int value; 340 size_t size; 341 342 mib[3] = code; 343 size = sizeof(value); 344 if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) < 0) 345 return (-1); 346 else 347 return (value); 348 } 349 350 int 351 setinet6sysctl(int code, int newval) 352 { 353 int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 }; 354 int value; 355 size_t size; 356 357 mib[3] = code; 358 size = sizeof(value); 359 if (sysctl(mib, nitems(mib), &value, &size, 360 &newval, sizeof(newval)) < 0) 361 return (-1); 362 else 363 return (value); 364 } 365 366 /*------------------------------------------------------------*/ 367 368 /* get ia6_flags for link-local addr on if. returns -1 on error. */ 369 static int 370 get_llflag(const char *name) 371 { 372 struct ifaddrs *ifap, *ifa; 373 struct in6_ifreq ifr6; 374 struct sockaddr_in6 *sin6; 375 int s; 376 377 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) { 378 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s", 379 strerror(errno)); 380 exit(1); 381 } 382 if (getifaddrs(&ifap) != 0) { 383 warnmsg(LOG_ERR, __func__, "getifaddrs: %s", 384 strerror(errno)); 385 exit(1); 386 } 387 388 for (ifa = ifap; ifa; ifa = ifa->ifa_next) { 389 if (strlen(ifa->ifa_name) != strlen(name) || 390 strncmp(ifa->ifa_name, name, strlen(name)) != 0) 391 continue; 392 if (ifa->ifa_addr->sa_family != AF_INET6) 393 continue; 394 sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr; 395 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) 396 continue; 397 398 memset(&ifr6, 0, sizeof(ifr6)); 399 strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name)); 400 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len); 401 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) { 402 warnmsg(LOG_ERR, __func__, 403 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno)); 404 exit(1); 405 } 406 407 freeifaddrs(ifap); 408 close(s); 409 return (ifr6.ifr_ifru.ifru_flags6); 410 } 411 412 freeifaddrs(ifap); 413 close(s); 414 return (-1); 415 } 416 417 418 static void 419 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 420 { 421 int i; 422 423 for (i = 0; i < RTAX_MAX; i++) { 424 if (addrs & (1 << i)) { 425 rti_info[i] = sa; 426 NEXT_SA(sa); 427 } else 428 rti_info[i] = NULL; 429 } 430 } 431