rtsol.tproj/if.c

   1 /*
   2  * Copyright (c) 2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 /*      $KAME: if.c,v 1.15 2001/05/22 06:04:17 jinmei Exp $     */
  30
  31 /*
  32  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  * 3. Neither the name of the project nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  *
  59  * $FreeBSD: src/usr.sbin/rtsold/if.c,v 1.2.2.3 2001/07/03 11:02:16 ume Exp $
  60  */
  61
  62 #include <sys/param.h>
  63 #include <sys/socket.h>
  64 #include <sys/sysctl.h>
  65 #include <sys/ioctl.h>
  66 #include <sys/queue.h>
  67
  68 #include <net/if.h>
  69 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__)
  70 #include <net/if_var.h>
  71 #endif /* __FreeBSD__ >= 3 */
  72 #include <net/if_types.h>
  73 #include <net/route.h>
  74 #include <net/if_dl.h>
  75 #include <net/if_media.h>
  76 #if defined ( __FreeBSD__) || defined (__APPLE__)
  77 # include <net/ethernet.h>
  78 #endif
  79 #ifdef __NetBSD__
  80 #include <net/if_ether.h>
  81 #endif
  82 #if defined(__bsdi__) || defined(__OpenBSD__)
  83 # include <netinet/in.h>
  84 # include <netinet/if_ether.h>
  85 #endif
  86 #include <netinet/in.h>
  87 #include <netinet/icmp6.h>
  88
  89 #include <netinet6/in6_var.h>
  90
  91 #include <stdio.h>
  92 #include <unistd.h>
  93 #include <stdlib.h>
  94 #include <syslog.h>
  95 #include <string.h>
  96 #include <fcntl.h>
  97 #include <errno.h>
  98 #include <limits.h>
  99 #ifdef HAVE_GETIFADDRS
 100 #include <ifaddrs.h>
 101 #endif
 102
 103 #include "rtsold.h"
 104
 105 extern int rssock;
 106 static int ifsock;
 107
 108 static int get_llflag __P((const char *name));
 109 #ifndef HAVE_GETIFADDRS
 110 static unsigned int if_maxindex __P((void));
 111 #endif
 112 static void get_rtaddrs __P((int addrs, struct sockaddr *sa,
 113                              struct sockaddr **rti_info));
 114
 115 int
 116 ifinit()
 117 {
 118         ifsock = rssock;
 119
 120         return(0);
 121 }
 122
 123 int
 124 interface_up(char *name)
 125 {
 126         struct ifreq ifr;
 127         int llflag;
 128
 129         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
 130
 131         if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
 132                 warnmsg(LOG_WARNING, __FUNCTION__, "ioctl(SIOCGIFFLAGS): %s",
 133                        strerror(errno));
 134                 return(-1);
 135         }
 136         if (!(ifr.ifr_flags & IFF_UP)) {
 137                 ifr.ifr_flags |= IFF_UP;
 138                 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
 139                         warnmsg(LOG_ERR, __FUNCTION__,
 140                                 "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
 141                 }
 142                 return(-1);
 143         }
 144
 145         warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name);
 146
 147         llflag = get_llflag(name);
 148         if (llflag < 0) {
 149                 warnmsg(LOG_WARNING, __FUNCTION__,
 150                         "get_llflag() failed, anyway I'll try");
 151                 return 0;
 152         }
 153
 154         if (!(llflag & IN6_IFF_NOTREADY)) {
 155                 warnmsg(LOG_DEBUG, __FUNCTION__,
 156                         "%s is ready", name);
 157                 return(0);
 158         } else {
 159                 if (llflag & IN6_IFF_TENTATIVE) {
 160                         warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative",
 161                                name);
 162                         return IFS_TENTATIVE;
 163                 }
 164                 if (llflag & IN6_IFF_DUPLICATED)
 165                         warnmsg(LOG_DEBUG, __FUNCTION__, "%s is duplicated",
 166                                name);
 167                 return -1;
 168         }
 169 }
 170
 171 int
 172 interface_status(struct ifinfo *ifinfo)
 173 {
 174         char *ifname = ifinfo->ifname;
 175         struct ifreq ifr;
 176         struct ifmediareq ifmr;
 177
 178         /* get interface flags */
 179         memset(&ifr, 0, sizeof(ifr));
 180         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 181         if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
 182                 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFFLAGS) on %s: %s",
 183                        ifname, strerror(errno));
 184                 return(-1);
 185         }
 186         /*
 187          * if one of UP and RUNNING flags is dropped,
 188          * the interface is not active.
 189          */
 190         if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 191                 goto inactive;
 192         }
 193
 194         /* Next, check carrier on the interface, if possible */
 195         if (!ifinfo->mediareqok)
 196                 goto active;
 197         memset(&ifmr, 0, sizeof(ifmr));
 198         strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
 199
 200         if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 201                 if (errno != EINVAL) {
 202                         warnmsg(LOG_DEBUG, __FUNCTION__,
 203                                 "ioctl(SIOCGIFMEDIA) on %s: %s",
 204                                ifname, strerror(errno));
 205                         return(-1);
 206                 }
 207                 /*
 208                  * EINVAL simply means that the interface does not support
 209                  * the SIOCGIFMEDIA ioctl. We regard it alive.
 210                  */
 211                 ifinfo->mediareqok = 0;
 212                 goto active;
 213         }
 214
 215         if (ifmr.ifm_status & IFM_AVALID) {
 216                 switch(ifmr.ifm_active & IFM_NMASK) {
 217                  case IFM_ETHER:
 218                          if (ifmr.ifm_status & IFM_ACTIVE)
 219                                  goto active;
 220                          else
 221                                  goto inactive;
 222                          break;
 223                  default:
 224                          goto inactive;
 225                 }
 226         }
 227
 228   inactive:
 229         return(0);
 230
 231   active:
 232         return(1);
 233 }
 234
 235 #define ROUNDUP(a, size) \
 236         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
 237
 238 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
 239         ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
 240                                                  sizeof(uint32_t)) :\
 241                                                  sizeof(uint32_t)))
 242 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 243
 244 int
 245 lladdropt_length(struct sockaddr_dl *sdl)
 246 {
 247         switch(sdl->sdl_type) {
 248          case IFT_ETHER:
 249 #ifdef IFT_IEEE80211
 250         case IFT_IEEE80211:
 251 #endif
 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 #ifdef IFT_IEEE80211
 268         case IFT_IEEE80211:
 269 #endif
 270                  ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 271                  addr = (char *)(ndopt + 1);
 272                  memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 273                  break;
 274          default:
 275                  warnmsg(LOG_ERR, __FUNCTION__,
 276                          "unsupported link type(%d)", sdl->sdl_type);
 277                  exit(1);
 278         }
 279
 280         return;
 281 }
 282
 283 struct sockaddr_dl *
 284 if_nametosdl(char *name)
 285 {
 286         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 287         char *buf, *next, *lim;
 288         size_t len;
 289         struct if_msghdr *ifm;
 290         struct sockaddr *sa, *rti_info[RTAX_MAX];
 291         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 292
 293         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 294                 return(NULL);
 295         if ((buf = malloc(len)) == NULL)
 296                 return(NULL);
 297         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 298                 free(buf);
 299                 return(NULL);
 300         }
 301
 302         lim = buf + len;
 303         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 304                 ifm = (struct if_msghdr *)next;
 305                 if (ifm->ifm_type == RTM_IFINFO) {
 306                         sa = (struct sockaddr *)(ifm + 1);
 307                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 308                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 309                                 if (sa->sa_family == AF_LINK) {
 310                                         sdl = (struct sockaddr_dl *)sa;
 311                                         if (strlen(name) != sdl->sdl_nlen)
 312                                                 continue; /* not same len */
 313                                         if (strncmp(&sdl->sdl_data[0],
 314                                                     name,
 315                                                     sdl->sdl_nlen) == 0) {
 316                                                 break;
 317                                         }
 318                                 }
 319                         }
 320                 }
 321         }
 322         if (next == lim) {
 323                 /* search failed */
 324                 free(buf);
 325                 return(NULL);
 326         }
 327
 328         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
 329                 return(NULL);
 330         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 331
 332         free(buf);
 333         return(ret_sdl);
 334 }
 335
 336 int
 337 getinet6sysctl(int code)
 338 {
 339         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 340         int value;
 341         size_t size;
 342
 343         mib[3] = code;
 344         size = sizeof(value);
 345         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
 346                 return -1;
 347         else
 348                 return value;
 349 }
 350
 351 /*------------------------------------------------------------*/
 352
 353 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 354 static int
 355 get_llflag(const char *name)
 356 {
 357 #ifdef HAVE_GETIFADDRS
 358         struct ifaddrs *ifap, *ifa;
 359         struct in6_ifreq ifr6;
 360         struct sockaddr_in6 *sin6;
 361         int s;
 362
 363         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 364                 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
 365                     strerror(errno));
 366                 exit(1);
 367         }
 368         if (getifaddrs(&ifap) != 0) {
 369                 warnmsg(LOG_ERR, __FUNCTION__, "etifaddrs: %s",
 370                     strerror(errno));
 371                 exit(1);
 372         }
 373
 374         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 375                 if (strlen(ifa->ifa_name) != strlen(name)
 376                  || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 377                         continue;
 378                 if (ifa->ifa_addr->sa_family != AF_INET6)
 379                         continue;
 380                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 381                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 382                         continue;
 383
 384                 memset(&ifr6, 0, sizeof(ifr6));
 385                 strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
 386                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 387                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 388                         warnmsg(LOG_ERR, __FUNCTION__,
 389                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 390                         exit(1);
 391                 }
 392
 393                 freeifaddrs(ifap);
 394                 close(s);
 395                 return ifr6.ifr_ifru.ifru_flags6;
 396         }
 397
 398         freeifaddrs(ifap);
 399         close(s);
 400         return -1;
 401 #else
 402         int s;
 403         unsigned int maxif;
 404         struct ifreq *iflist;
 405         struct ifconf ifconf;
 406         struct ifreq *ifr, *ifr_end;
 407         struct sockaddr_in6 *sin6;
 408         struct in6_ifreq ifr6;
 409
 410         maxif = if_maxindex() + 1;
 411         iflist = (struct ifreq *)malloc(maxif * BUFSIZ);        /* XXX */
 412         if (iflist == NULL) {
 413                 warnmsg(LOG_ERR, __FUNCTION__, "not enough core");
 414                 exit(1);
 415         }
 416
 417         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 418                 warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
 419                     strerror(errno));
 420                 exit(1);
 421         }
 422         memset(&ifconf, 0, sizeof(ifconf));
 423         ifconf.ifc_req = iflist;
 424         ifconf.ifc_len = maxif * BUFSIZ;        /* XXX */
 425         if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
 426                 warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFCONF): %s",
 427                     strerror(errno));
 428                 exit(1);
 429         }
 430
 431         /* Look for this interface in the list */
 432         ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
 433         for (ifr = ifconf.ifc_req;
 434              ifr < ifr_end;
 435              ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
 436                                     + ifr->ifr_addr.sa_len)) {
 437                 if (strlen(ifr->ifr_name) != strlen(name)
 438                  || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
 439                         continue;
 440                 if (ifr->ifr_addr.sa_family != AF_INET6)
 441                         continue;
 442                 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
 443                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 444                         continue;
 445
 446                 memset(&ifr6, 0, sizeof(ifr6));
 447                 strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
 448                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 449                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 450                         warnmsg(LOG_ERR, __FUNCTION__,
 451                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 452                         exit(1);
 453                 }
 454
 455                 free(iflist);
 456                 close(s);
 457                 return ifr6.ifr_ifru.ifru_flags6;
 458         }
 459
 460         free(iflist);
 461         close(s);
 462         return -1;
 463 #endif
 464 }
 465
 466 #ifndef HAVE_GETIFADDRS
 467 static unsigned int
 468 if_maxindex()
 469 {
 470         struct if_nameindex *p, *p0;
 471         unsigned int max = 0;
 472
 473         p0 = if_nameindex();
 474         for (p = p0; p && p->if_index && p->if_name; p++) {
 475                 if (max < p->if_index)
 476                         max = p->if_index;
 477         }
 478         if_freenameindex(p0);
 479         return max;
 480 }
 481 #endif
 482
 483 static void
 484 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 485 {
 486         int i;
 487
 488         for (i = 0; i < RTAX_MAX; i++) {
 489                 if (addrs & (1 << i)) {
 490                         rti_info[i] = sa;
 491                         NEXT_SA(sa);
 492                 }
 493                 else
 494                         rti_info[i] = NULL;
 495         }
 496 }