rtsol.tproj/if.c

   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  */
  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 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
  42 #include <net/if_var.h>
  43 #endif /* __FreeBSD__ >= 3 */
  44 #include <net/if_types.h>
  45 #include <net/route.h>
  46 #include <net/if_dl.h>
  47 #include <net/if_media.h>
  48 #if defined ( __FreeBSD__) || defined (__APPLE__)
  49 # include <net/ethernet.h>
  50 #endif
  51 #ifdef __NetBSD__
  52 #include <net/if_ether.h>
  53 #endif
  54 #if defined(__bsdi__) || defined(__OpenBSD__)
  55 # include <netinet/in.h>
  56 # include <netinet/if_ether.h>
  57 #endif
  58 #include <netinet/in.h>
  59 #include <netinet/icmp6.h>
  60
  61 #include <netinet6/in6_var.h>
  62
  63 #include <stdio.h>
  64 #include <unistd.h>
  65 #include <stdlib.h>
  66 #include <syslog.h>
  67 #include <string.h>
  68 #include <fcntl.h>
  69 #include <errno.h>
  70 #include <limits.h>
  71 #ifdef HAVE_GETIFADDRS
  72 #include <ifaddrs.h>
  73 #endif
  74
  75 #include "rtsold.h"
  76
  77 extern int rssock;
  78 static int ifsock;
  79
  80 static int get_llflag __P((const char *name));
  81 #ifndef HAVE_GETIFADDRS
  82 static unsigned int if_maxindex __P((void));
  83 #endif
  84 static void get_rtaddrs __P((int addrs, struct sockaddr *sa,
  85                              struct sockaddr **rti_info));
  86
  87 int
  88 ifinit()
  89 {
  90         ifsock = rssock;
  91
  92         return(0);
  93 }
  94
  95 int
  96 interface_up(char *name)
  97 {
  98         struct ifreq ifr;
  99         int llflag;
 100
 101         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 102
 103         if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 104                 warnmsg(LOG_WARNING, __FUNCTION__, "ioctl(SIOCGIFFLAGS): %s",
 105                        strerror(errno));
 106                 return(-1);
 107         }
 108         if (!(ifr.ifr_flags & IFF_UP)) {
 109                 ifr.ifr_flags |= IFF_UP;
 110                 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 111                         warnmsg(LOG_ERR, __FUNCTION__,
 112                                 "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
 113                 }
 114                 return(-1);
 115         }
 116
 117         warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name);
 118
 119         llflag = get_llflag(name);
 120         if (llflag < 0) {
 121                 warnmsg(LOG_WARNING, __FUNCTION__,
 122                         "get_llflag() failed, anyway I'll try");
 123                 return 0;
 124         }
 125
 126         if (!(llflag & IN6_IFF_NOTREADY)) {
 127                 warnmsg(LOG_DEBUG, __FUNCTION__,
 128                         "%s is ready", name);
 129                 return(0);
 130         } else {
 131                 if (llflag & IN6_IFF_TENTATIVE) {
 132                         warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative",
 133                                name);
 134                         return IFS_TENTATIVE;
 135                 }
 136                 if (llflag & IN6_IFF_DUPLICATED)
 137                         warnmsg(LOG_DEBUG, __FUNCTION__, "%s is duplicated",
 138                                name);
 139                 return -1;
 140         }
 141 }
 142
 143 int
 144 interface_status(struct ifinfo *ifinfo)
 145 {
 146         char *ifname = ifinfo->ifname;
 147         struct ifreq ifr;
 148         struct ifmediareq ifmr;
 149
 150         /* get interface flags */
 151         memset(&ifr, 0, sizeof(ifr));
 152         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 153         if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
 154                 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFFLAGS) on %s: %s",
 155                        ifname, strerror(errno));
 156                 return(-1);
 157         }
 158         /*
 159          * if one of UP and RUNNING flags is dropped,
 160          * the interface is not active.
 161          */
 162         if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 163                 goto inactive;
 164         }
 165
 166         /* Next, check carrier on the interface, if possible */
 167         if (!ifinfo->mediareqok)
 168                 goto active;
 169         memset(&ifmr, 0, sizeof(ifmr));
 170         strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
 171
 172         if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 173                 if (errno != EINVAL) {
 174                         warnmsg(LOG_DEBUG, __FUNCTION__,
 175                                 "ioctl(SIOCGIFMEDIA) on %s: %s",
 176                                ifname, strerror(errno));
 177                         return(-1);
 178                 }
 179                 /*
 180                  * EINVAL simply means that the interface does not support
 181                  * the SIOCGIFMEDIA ioctl. We regard it alive.
 182                  */
 183                 ifinfo->mediareqok = 0;
 184                 goto active;
 185         }
 186
 187         if (ifmr.ifm_status & IFM_AVALID) {
 188                 switch(ifmr.ifm_active & IFM_NMASK) {
 189                  case IFM_ETHER:
 190                          if (ifmr.ifm_status & IFM_ACTIVE)
 191                                  goto active;
 192                          else
 193                                  goto inactive;
 194                          break;
 195                  default:
 196                          goto inactive;
 197                 }
 198         }
 199
 200   inactive:
 201         return(0);
 202
 203   active:
 204         return(1);
 205 }
 206
 207 #define ROUNDUP(a, size) \
 208         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
 209
 210 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
 211         ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
 212                                                  sizeof(uint32_t)) :\
 213                                                  sizeof(uint32_t)))
 214 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 215
 216 int
 217 lladdropt_length(struct sockaddr_dl *sdl)
 218 {
 219         switch(sdl->sdl_type) {
 220          case IFT_ETHER:
 221 #ifdef IFT_IEEE80211
 222         case IFT_IEEE80211:
 223 #endif
 224                  return(ROUNDUP8(ETHER_ADDR_LEN + 2));
 225          default:
 226                  return(0);
 227         }
 228 }
 229
 230 void
 231 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 232 {
 233         char *addr;
 234
 235         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 236
 237         switch(sdl->sdl_type) {
 238          case IFT_ETHER:
 239 #ifdef IFT_IEEE80211
 240         case IFT_IEEE80211:
 241 #endif
 242                  ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 243                  addr = (char *)(ndopt + 1);
 244                  memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 245                  break;
 246          default:
 247                  warnmsg(LOG_ERR, __FUNCTION__,
 248                          "unsupported link type(%d)", sdl->sdl_type);
 249                  exit(1);
 250         }
 251
 252         return;
 253 }
 254
 255 struct sockaddr_dl *
 256 if_nametosdl(char *name)
 257 {
 258         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 259         char *buf, *next, *lim;
 260         size_t len;
 261         struct if_msghdr *ifm;
 262         struct sockaddr *sa, *rti_info[RTAX_MAX];
 263         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 264
 265         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 266                 return(NULL);
 267         if ((buf = malloc(len)) == NULL)
 268                 return(NULL);
 269         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 270                 free(buf);
 271                 return(NULL);
 272         }
 273
 274         lim = buf + len;
 275         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 276                 ifm = (struct if_msghdr *)next;
 277                 if (ifm->ifm_type == RTM_IFINFO) {
 278                         sa = (struct sockaddr *)(ifm + 1);
 279                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 280                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 281                                 if (sa->sa_family == AF_LINK) {
 282                                         sdl = (struct sockaddr_dl *)sa;
 283                                         if (strlen(name) != sdl->sdl_nlen)
 284                                                 continue; /* not same len */
 285                                         if (strncmp(&sdl->sdl_data[0],
 286                                                     name,
 287                                                     sdl->sdl_nlen) == 0) {
 288                                                 break;
 289                                         }
 290                                 }
 291                         }
 292                 }
 293         }
 294         if (next == lim) {
 295                 /* search failed */
 296                 free(buf);
 297                 return(NULL);
 298         }
 299
 300         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
 301                 return(NULL);
 302         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 303
 304         free(buf);
 305         return(ret_sdl);
 306 }
 307
 308 int
 309 getinet6sysctl(int code)
 310 {
 311         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 312         int value;
 313         size_t size;
 314
 315         mib[3] = code;
 316         size = sizeof(value);
 317         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
 318                 return -1;
 319         else
 320                 return value;
 321 }
 322
 323 /*------------------------------------------------------------*/
 324
 325 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 326 static int
 327 get_llflag(const char *name)
 328 {
 329 #ifdef HAVE_GETIFADDRS
 330         struct ifaddrs *ifap, *ifa;
 331         struct in6_ifreq ifr6;
 332         struct sockaddr_in6 *sin6;
 333         int s;
 334
 335         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 336                 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
 337                     strerror(errno));
 338                 exit(1);
 339         }
 340         if (getifaddrs(&ifap) != 0) {
 341                 warnmsg(LOG_ERR, __FUNCTION__, "etifaddrs: %s",
 342                     strerror(errno));
 343                 exit(1);
 344         }
 345
 346         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 347                 if (strlen(ifa->ifa_name) != strlen(name)
 348                  || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 349                         continue;
 350                 if (ifa->ifa_addr->sa_family != AF_INET6)
 351                         continue;
 352                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 353                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 354                         continue;
 355
 356                 memset(&ifr6, 0, sizeof(ifr6));
 357                 strcpy(ifr6.ifr_name, name);
 358                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 359                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 360                         warnmsg(LOG_ERR, __FUNCTION__,
 361                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 362                         exit(1);
 363                 }
 364
 365                 freeifaddrs(ifap);
 366                 close(s);
 367                 return ifr6.ifr_ifru.ifru_flags6;
 368         }
 369
 370         freeifaddrs(ifap);
 371         close(s);
 372         return -1;
 373 #else
 374         int s;
 375         unsigned int maxif;
 376         struct ifreq *iflist;
 377         struct ifconf ifconf;
 378         struct ifreq *ifr, *ifr_end;
 379         struct sockaddr_in6 *sin6;
 380         struct in6_ifreq ifr6;
 381
 382         maxif = if_maxindex() + 1;
 383         iflist = (struct ifreq *)malloc(maxif * BUFSIZ);        /* XXX */
 384         if (iflist == NULL) {
 385                 warnmsg(LOG_ERR, __FUNCTION__, "not enough core");
 386                 exit(1);
 387         }
 388
 389         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 390                 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
 391                     strerror(errno));
 392                 exit(1);
 393         }
 394         memset(&ifconf, 0, sizeof(ifconf));
 395         ifconf.ifc_req = iflist;
 396         ifconf.ifc_len = maxif * BUFSIZ;        /* XXX */
 397         if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
 398                 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFCONF): %s",
 399                     strerror(errno));
 400                 exit(1);
 401         }
 402
 403         /* Look for this interface in the list */
 404         ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
 405         for (ifr = ifconf.ifc_req;
 406              ifr < ifr_end;
 407              ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
 408                                     + ifr->ifr_addr.sa_len)) {
 409                 if (strlen(ifr->ifr_name) != strlen(name)
 410                  || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
 411                         continue;
 412                 if (ifr->ifr_addr.sa_family != AF_INET6)
 413                         continue;
 414                 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
 415                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 416                         continue;
 417
 418                 memset(&ifr6, 0, sizeof(ifr6));
 419                 strcpy(ifr6.ifr_name, name);
 420                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 421                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 422                         warnmsg(LOG_ERR, __FUNCTION__,
 423                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 424                         exit(1);
 425                 }
 426
 427                 free(iflist);
 428                 close(s);
 429                 return ifr6.ifr_ifru.ifru_flags6;
 430         }
 431
 432         free(iflist);
 433         close(s);
 434         return -1;
 435 #endif
 436 }
 437
 438 #ifndef HAVE_GETIFADDRS
 439 static unsigned int
 440 if_maxindex()
 441 {
 442         struct if_nameindex *p, *p0;
 443         unsigned int max = 0;
 444
 445         p0 = if_nameindex();
 446         for (p = p0; p && p->if_index && p->if_name; p++) {
 447                 if (max < p->if_index)
 448                         max = p->if_index;
 449         }
 450         if_freenameindex(p0);
 451         return max;
 452 }
 453 #endif
 454
 455 static void
 456 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 457 {
 458         int i;
 459
 460         for (i = 0; i < RTAX_MAX; i++) {
 461                 if (addrs & (1 << i)) {
 462                         rti_info[i] = sa;
 463                         NEXT_SA(sa);
 464                 }
 465                 else
 466                         rti_info[i] = NULL;
 467         }
 468 }