usr.sbin/rtsold/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  * $DragonFly: src/usr.sbin/rtsold/if.c,v 1.6 2005/12/05 00:56:37 swildner Exp $
  33  */
  34
  35 #include <sys/param.h>
  36 #include <sys/socket.h>
  37 #include <sys/sysctl.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/queue.h>
  40
  41 #include <net/if.h>
  42 #if defined(__DragonFly__)
  43 #include <net/if_var.h>
  44 #endif /* __DragonFly__ >= 3 */
  45 #include <net/if_types.h>
  46 #include <net/route.h>
  47 #include <net/if_dl.h>
  48 #include <net/if_media.h>
  49 #ifdef __DragonFly__
  50 # include <net/ethernet.h>
  51 #endif
  52 #ifdef __NetBSD__
  53 #include <net/if_ether.h>
  54 #endif
  55 #if defined(__bsdi__) || defined(__OpenBSD__)
  56 # include <netinet/in.h>
  57 # include <netinet/if_ether.h>
  58 #endif
  59 #include <netinet/in.h>
  60 #include <netinet/icmp6.h>
  61
  62 #include <netinet6/in6_var.h>
  63
  64 #include <stdio.h>
  65 #include <unistd.h>
  66 #include <stdlib.h>
  67 #include <syslog.h>
  68 #include <string.h>
  69 #include <fcntl.h>
  70 #include <errno.h>
  71 #include <limits.h>
  72 #ifdef HAVE_GETIFADDRS
  73 #include <ifaddrs.h>
  74 #endif
  75
  76 #include "rtsold.h"
  77
  78 extern int rssock;
  79 static int ifsock;
  80
  81 static int get_llflag(const char *name);
  82 #ifndef HAVE_GETIFADDRS
  83 static unsigned int if_maxindex(void);
  84 #endif
  85 static void get_rtaddrs(int addrs, struct sockaddr *sa,
  86                              struct sockaddr **rti_info);
  87
  88 int
  89 ifinit(void)
  90 {
  91         ifsock = rssock;
  92
  93         return(0);
  94 }
  95
  96 int
  97 interface_up(char *name)
  98 {
  99         struct ifreq ifr;
 100         int llflag;
 101
 102         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 103
 104         if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 105                 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
 106                        strerror(errno));
 107                 return(-1);
 108         }
 109         if (!(ifr.ifr_flags & IFF_UP)) {
 110                 ifr.ifr_flags |= IFF_UP;
 111                 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 112                         warnmsg(LOG_ERR, __func__,
 113                                 "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
 114                 }
 115                 return(-1);
 116         }
 117
 118         warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
 119
 120         llflag = get_llflag(name);
 121         if (llflag < 0) {
 122                 warnmsg(LOG_WARNING, __func__,
 123                         "get_llflag() failed, anyway I'll try");
 124                 return 0;
 125         }
 126
 127         if (!(llflag & IN6_IFF_NOTREADY)) {
 128                 warnmsg(LOG_DEBUG, __func__,
 129                         "%s is ready", name);
 130                 return(0);
 131         } else {
 132                 if (llflag & IN6_IFF_TENTATIVE) {
 133                         warnmsg(LOG_DEBUG, __func__, "%s is tentative",
 134                                name);
 135                         return IFS_TENTATIVE;
 136                 }
 137                 if (llflag & IN6_IFF_DUPLICATED)
 138                         warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
 139                                name);
 140                 return -1;
 141         }
 142 }
 143
 144 int
 145 interface_status(struct ifinfo *ifinfo)
 146 {
 147         char *ifname = ifinfo->ifname;
 148         struct ifreq ifr;
 149         struct ifmediareq ifmr;
 150
 151         /* get interface flags */
 152         memset(&ifr, 0, sizeof(ifr));
 153         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 154         if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
 155                 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
 156                        ifname, strerror(errno));
 157                 return(-1);
 158         }
 159         /*
 160          * if one of UP and RUNNING flags is dropped,
 161          * the interface is not active.
 162          */
 163         if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 164                 goto inactive;
 165         }
 166
 167         /* Next, check carrier on the interface, if possible */
 168         if (!ifinfo->mediareqok)
 169                 goto active;
 170         memset(&ifmr, 0, sizeof(ifmr));
 171         strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
 172
 173         if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 174                 if (errno != EINVAL) {
 175                         warnmsg(LOG_DEBUG, __func__,
 176                                 "ioctl(SIOCGIFMEDIA) on %s: %s",
 177                                ifname, strerror(errno));
 178                         return(-1);
 179                 }
 180                 /*
 181                  * EINVAL simply means that the interface does not support
 182                  * the SIOCGIFMEDIA ioctl. We regard it alive.
 183                  */
 184                 ifinfo->mediareqok = 0;
 185                 goto active;
 186         }
 187
 188         if (ifmr.ifm_status & IFM_AVALID) {
 189                 switch(ifmr.ifm_active & IFM_NMASK) {
 190                  case IFM_ETHER:
 191                          if (ifmr.ifm_status & IFM_ACTIVE)
 192                                  goto active;
 193                          else
 194                                  goto inactive;
 195                          break;
 196                  default:
 197                          goto inactive;
 198                 }
 199         }
 200
 201   inactive:
 202         return(0);
 203
 204   active:
 205         return(1);
 206 }
 207
 208 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 209
 210 int
 211 lladdropt_length(struct sockaddr_dl *sdl)
 212 {
 213         switch(sdl->sdl_type) {
 214          case IFT_ETHER:
 215 #ifdef IFT_IEEE80211
 216         case IFT_IEEE80211:
 217 #endif
 218                  return(ROUNDUP8(ETHER_ADDR_LEN + 2));
 219          default:
 220                  return(0);
 221         }
 222 }
 223
 224 void
 225 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 226 {
 227         char *addr;
 228
 229         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 230
 231         switch(sdl->sdl_type) {
 232          case IFT_ETHER:
 233 #ifdef IFT_IEEE80211
 234         case IFT_IEEE80211:
 235 #endif
 236                  ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 237                  addr = (char *)(ndopt + 1);
 238                  memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 239                  break;
 240          default:
 241                  warnmsg(LOG_ERR, __func__,
 242                          "unsupported link type(%d)", sdl->sdl_type);
 243                  exit(1);
 244         }
 245
 246         return;
 247 }
 248
 249 struct sockaddr_dl *
 250 if_nametosdl(char *name)
 251 {
 252         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 253         char *buf, *next, *lim;
 254         size_t len;
 255         struct if_msghdr *ifm;
 256         struct sockaddr *sa, *rti_info[RTAX_MAX];
 257         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 258
 259         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 260                 return(NULL);
 261         if ((buf = malloc(len)) == NULL)
 262                 return(NULL);
 263         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 264                 free(buf);
 265                 return(NULL);
 266         }
 267
 268         lim = buf + len;
 269         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 270                 ifm = (struct if_msghdr *)next;
 271                 if (ifm->ifm_type == RTM_IFINFO) {
 272                         sa = (struct sockaddr *)(ifm + 1);
 273                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 274                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 275                                 if (sa->sa_family == AF_LINK) {
 276                                         sdl = (struct sockaddr_dl *)sa;
 277                                         if (strlen(name) != sdl->sdl_nlen)
 278                                                 continue; /* not same len */
 279                                         if (strncmp(&sdl->sdl_data[0],
 280                                                     name,
 281                                                     sdl->sdl_nlen) == 0) {
 282                                                 break;
 283                                         }
 284                                 }
 285                         }
 286                 }
 287         }
 288         if (next == lim) {
 289                 /* search failed */
 290                 free(buf);
 291                 return(NULL);
 292         }
 293
 294         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
 295                 return(NULL);
 296         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 297
 298         free(buf);
 299         return(ret_sdl);
 300 }
 301
 302 int
 303 getinet6sysctl(int code)
 304 {
 305         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 306         int value;
 307         size_t size;
 308
 309         mib[3] = code;
 310         size = sizeof(value);
 311         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
 312                 return -1;
 313         else
 314                 return value;
 315 }
 316
 317 /*------------------------------------------------------------*/
 318
 319 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 320 static int
 321 get_llflag(const char *name)
 322 {
 323 #ifdef HAVE_GETIFADDRS
 324         struct ifaddrs *ifap, *ifa;
 325         struct in6_ifreq ifr6;
 326         struct sockaddr_in6 *sin6;
 327         int s;
 328
 329         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 330                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 331                     strerror(errno));
 332                 exit(1);
 333         }
 334         if (getifaddrs(&ifap) != 0) {
 335                 warnmsg(LOG_ERR, __func__, "etifaddrs: %s",
 336                     strerror(errno));
 337                 exit(1);
 338         }
 339
 340         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 341                 if (strlen(ifa->ifa_name) != strlen(name)
 342                  || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 343                         continue;
 344                 if (ifa->ifa_addr->sa_family != AF_INET6)
 345                         continue;
 346                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 347                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 348                         continue;
 349
 350                 memset(&ifr6, 0, sizeof(ifr6));
 351                 strcpy(ifr6.ifr_name, name);
 352                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 353                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 354                         warnmsg(LOG_ERR, __func__,
 355                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 356                         exit(1);
 357                 }
 358
 359                 freeifaddrs(ifap);
 360                 close(s);
 361                 return ifr6.ifr_ifru.ifru_flags6;
 362         }
 363
 364         freeifaddrs(ifap);
 365         close(s);
 366         return -1;
 367 #else
 368         int s;
 369         unsigned int maxif;
 370         struct ifreq *iflist;
 371         struct ifconf ifconf;
 372         struct ifreq *ifr, *ifr_end;
 373         struct sockaddr_in6 *sin6;
 374         struct in6_ifreq ifr6;
 375
 376         maxif = if_maxindex() + 1;
 377         iflist = (struct ifreq *)malloc(maxif * BUFSIZ);        /* XXX */
 378         if (iflist == NULL) {
 379                 warnmsg(LOG_ERR, __func__, "not enough core");
 380                 exit(1);
 381         }
 382
 383         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 384                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 385                     strerror(errno));
 386                 exit(1);
 387         }
 388         memset(&ifconf, 0, sizeof(ifconf));
 389         ifconf.ifc_req = iflist;
 390         ifconf.ifc_len = maxif * BUFSIZ;        /* XXX */
 391         if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
 392                 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFCONF): %s",
 393                     strerror(errno));
 394                 exit(1);
 395         }
 396
 397         /* Look for this interface in the list */
 398         ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
 399         for (ifr = ifconf.ifc_req;
 400              ifr < ifr_end;
 401              ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
 402                                     + ifr->ifr_addr.sa_len)) {
 403                 if (strlen(ifr->ifr_name) != strlen(name)
 404                  || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
 405                         continue;
 406                 if (ifr->ifr_addr.sa_family != AF_INET6)
 407                         continue;
 408                 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
 409                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 410                         continue;
 411
 412                 memset(&ifr6, 0, sizeof(ifr6));
 413                 strcpy(ifr6.ifr_name, name);
 414                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 415                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 416                         warnmsg(LOG_ERR, __func__,
 417                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 418                         exit(1);
 419                 }
 420
 421                 free(iflist);
 422                 close(s);
 423                 return ifr6.ifr_ifru.ifru_flags6;
 424         }
 425
 426         free(iflist);
 427         close(s);
 428         return -1;
 429 #endif
 430 }
 431
 432 #ifndef HAVE_GETIFADDRS
 433 static unsigned int
 434 if_maxindex(void)
 435 {
 436         struct if_nameindex *p, *p0;
 437         unsigned int max = 0;
 438
 439         p0 = if_nameindex();
 440         for (p = p0; p && p->if_index && p->if_name; p++) {
 441                 if (max < p->if_index)
 442                         max = p->if_index;
 443         }
 444         if_freenameindex(p0);
 445         return max;
 446 }
 447 #endif
 448
 449 static void
 450 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 451 {
 452         int i;
 453
 454         for (i = 0; i < RTAX_MAX; i++) {
 455                 if (addrs & (1 << i)) {
 456                         rti_info[i] = sa;
 457                         RT_ADVANCE(sa, sa);
 458                 }
 459                 else
 460                         rti_info[i] = NULL;
 461         }
 462 }