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  */
  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(__DragonFly__)
  42 #include <net/if_var.h>
  43 #endif /* __DragonFly__ >= 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 #ifdef __DragonFly__
  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(const char *name);
  81 #ifndef HAVE_GETIFADDRS
  82 static unsigned int if_maxindex(void);
  83 #endif
  84 static void get_rtaddrs(int addrs, struct sockaddr *sa,
  85                              struct sockaddr **rti_info);
  86
  87 int
  88 ifinit(void)
  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, __func__, "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, __func__,
 112                                 "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
 113                 }
 114                 return(-1);
 115         }
 116
 117         warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
 118
 119         llflag = get_llflag(name);
 120         if (llflag < 0) {
 121                 warnmsg(LOG_WARNING, __func__,
 122                         "get_llflag() failed, anyway I'll try");
 123                 return 0;
 124         }
 125
 126         if (!(llflag & IN6_IFF_NOTREADY)) {
 127                 warnmsg(LOG_DEBUG, __func__,
 128                         "%s is ready", name);
 129                 return(0);
 130         } else {
 131                 if (llflag & IN6_IFF_TENTATIVE) {
 132                         warnmsg(LOG_DEBUG, __func__, "%s is tentative",
 133                                name);
 134                         return IFS_TENTATIVE;
 135                 }
 136                 if (llflag & IN6_IFF_DUPLICATED)
 137                         warnmsg(LOG_DEBUG, __func__, "%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, __func__, "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, __func__,
 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 ROUNDUP8(a) (1 + (((a) - 1) | 7))
 208
 209 int
 210 lladdropt_length(struct sockaddr_dl *sdl)
 211 {
 212         switch(sdl->sdl_type) {
 213          case IFT_ETHER:
 214 #ifdef IFT_IEEE80211
 215         case IFT_IEEE80211:
 216 #endif
 217                  return(ROUNDUP8(ETHER_ADDR_LEN + 2));
 218          default:
 219                  return(0);
 220         }
 221 }
 222
 223 void
 224 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 225 {
 226         char *addr;
 227
 228         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 229
 230         switch(sdl->sdl_type) {
 231          case IFT_ETHER:
 232 #ifdef IFT_IEEE80211
 233         case IFT_IEEE80211:
 234 #endif
 235                  ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 236                  addr = (char *)(ndopt + 1);
 237                  memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 238                  break;
 239          default:
 240                  warnmsg(LOG_ERR, __func__,
 241                          "unsupported link type(%d)", sdl->sdl_type);
 242                  exit(1);
 243         }
 244
 245         return;
 246 }
 247
 248 struct sockaddr_dl *
 249 if_nametosdl(char *name)
 250 {
 251         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 252         char *buf, *next, *lim;
 253         size_t len;
 254         struct if_msghdr *ifm;
 255         struct sockaddr *sa, *rti_info[RTAX_MAX];
 256         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 257
 258         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 259                 return(NULL);
 260         if ((buf = malloc(len)) == NULL)
 261                 return(NULL);
 262         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 263                 free(buf);
 264                 return(NULL);
 265         }
 266
 267         lim = buf + len;
 268         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 269                 ifm = (struct if_msghdr *)next;
 270                 if (ifm->ifm_type == RTM_IFINFO) {
 271                         sa = (struct sockaddr *)(ifm + 1);
 272                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 273                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 274                                 if (sa->sa_family == AF_LINK) {
 275                                         sdl = (struct sockaddr_dl *)sa;
 276                                         if (strlen(name) != sdl->sdl_nlen)
 277                                                 continue; /* not same len */
 278                                         if (strncmp(&sdl->sdl_data[0],
 279                                                     name,
 280                                                     sdl->sdl_nlen) == 0) {
 281                                                 break;
 282                                         }
 283                                 }
 284                         }
 285                 }
 286         }
 287         if (next == lim) {
 288                 /* search failed */
 289                 free(buf);
 290                 return(NULL);
 291         }
 292
 293         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
 294                 return(NULL);
 295         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 296
 297         free(buf);
 298         return(ret_sdl);
 299 }
 300
 301 int
 302 getinet6sysctl(int code)
 303 {
 304         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 305         int value;
 306         size_t size;
 307
 308         mib[3] = code;
 309         size = sizeof(value);
 310         if (sysctl(mib, NELEM(mib), &value, &size, NULL, 0) < 0)
 311                 return -1;
 312         else
 313                 return value;
 314 }
 315
 316 /*------------------------------------------------------------*/
 317
 318 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 319 static int
 320 get_llflag(const char *name)
 321 {
 322 #ifdef HAVE_GETIFADDRS
 323         struct ifaddrs *ifap, *ifa;
 324         struct in6_ifreq ifr6;
 325         struct sockaddr_in6 *sin6;
 326         int s;
 327
 328         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 329                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 330                     strerror(errno));
 331                 exit(1);
 332         }
 333         if (getifaddrs(&ifap) != 0) {
 334                 warnmsg(LOG_ERR, __func__, "etifaddrs: %s",
 335                     strerror(errno));
 336                 exit(1);
 337         }
 338
 339         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 340                 if (strlen(ifa->ifa_name) != strlen(name)
 341                  || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 342                         continue;
 343                 if (ifa->ifa_addr->sa_family != AF_INET6)
 344                         continue;
 345                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 346                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 347                         continue;
 348
 349                 memset(&ifr6, 0, sizeof(ifr6));
 350                 strcpy(ifr6.ifr_name, name);
 351                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 352                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 353                         warnmsg(LOG_ERR, __func__,
 354                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 355                         exit(1);
 356                 }
 357
 358                 freeifaddrs(ifap);
 359                 close(s);
 360                 return ifr6.ifr_ifru.ifru_flags6;
 361         }
 362
 363         freeifaddrs(ifap);
 364         close(s);
 365         return -1;
 366 #else
 367         int s;
 368         unsigned int maxif;
 369         struct ifreq *iflist;
 370         struct ifconf ifconf;
 371         struct ifreq *ifr, *ifr_end;
 372         struct sockaddr_in6 *sin6;
 373         struct in6_ifreq ifr6;
 374
 375         maxif = if_maxindex() + 1;
 376         iflist = (struct ifreq *)malloc(maxif * BUFSIZ);        /* XXX */
 377         if (iflist == NULL) {
 378                 warnmsg(LOG_ERR, __func__, "not enough core");
 379                 exit(1);
 380         }
 381
 382         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 383                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 384                     strerror(errno));
 385                 exit(1);
 386         }
 387         memset(&ifconf, 0, sizeof(ifconf));
 388         ifconf.ifc_req = iflist;
 389         ifconf.ifc_len = maxif * BUFSIZ;        /* XXX */
 390         if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
 391                 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFCONF): %s",
 392                     strerror(errno));
 393                 exit(1);
 394         }
 395
 396         /* Look for this interface in the list */
 397         ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
 398         for (ifr = ifconf.ifc_req;
 399              ifr < ifr_end;
 400              ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
 401                                     + ifr->ifr_addr.sa_len)) {
 402                 if (strlen(ifr->ifr_name) != strlen(name)
 403                  || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
 404                         continue;
 405                 if (ifr->ifr_addr.sa_family != AF_INET6)
 406                         continue;
 407                 sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
 408                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 409                         continue;
 410
 411                 memset(&ifr6, 0, sizeof(ifr6));
 412                 strcpy(ifr6.ifr_name, name);
 413                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 414                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 415                         warnmsg(LOG_ERR, __func__,
 416                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 417                         exit(1);
 418                 }
 419
 420                 free(iflist);
 421                 close(s);
 422                 return ifr6.ifr_ifru.ifru_flags6;
 423         }
 424
 425         free(iflist);
 426         close(s);
 427         return -1;
 428 #endif
 429 }
 430
 431 #ifndef HAVE_GETIFADDRS
 432 static unsigned int
 433 if_maxindex(void)
 434 {
 435         struct if_nameindex *p, *p0;
 436         unsigned int max = 0;
 437
 438         p0 = if_nameindex();
 439         for (p = p0; p && p->if_index && p->if_name; p++) {
 440                 if (max < p->if_index)
 441                         max = p->if_index;
 442         }
 443         if_freenameindex(p0);
 444         return max;
 445 }
 446 #endif
 447
 448 static void
 449 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 450 {
 451         int i;
 452
 453         for (i = 0; i < RTAX_MAX; i++) {
 454                 if (addrs & (1 << i)) {
 455                         rti_info[i] = sa;
 456                         RT_ADVANCE(sa, sa);
 457                 }
 458                 else
 459                         rti_info[i] = NULL;
 460         }
 461 }