usr.sbin/rtsold/if.c

   1 /*      $NetBSD: if.c,v 1.14 2006/03/18 21:35:35 dan Exp $      */
   2 /*      $KAME: if.c,v 1.18 2002/05/31 10:10:03 itojun Exp $     */
   3
   4 /*
   5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the project nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/sysctl.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/queue.h>
  38
  39 #include <net/if.h>
  40 #include <net/if_types.h>
  41 #include <net/route.h>
  42 #include <net/if_dl.h>
  43 #include <net/if_media.h>
  44 #include <net/if_ether.h>
  45 #include <netinet/in.h>
  46 #include <netinet/icmp6.h>
  47
  48 #include <netinet6/in6_var.h>
  49
  50 #include <stdio.h>
  51 #include <unistd.h>
  52 #include <stdlib.h>
  53 #include <syslog.h>
  54 #include <string.h>
  55 #include <fcntl.h>
  56 #include <errno.h>
  57 #include <limits.h>
  58 #include <ifaddrs.h>
  59
  60 #include "rtsold.h"
  61
  62 extern int rssock;
  63 static int ifsock;
  64
  65 static int get_llflag __P((const char *));
  66 static void get_rtaddrs __P((int, struct sockaddr *, struct sockaddr **));
  67
  68 int
  69 ifinit(void)
  70 {
  71         ifsock = rssock;
  72
  73         return(0);
  74 }
  75
  76 int
  77 interface_up(char *name)
  78 {
  79         struct ifreq ifr;
  80         int llflag;
  81
  82         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
  83
  84         if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
  85                 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
  86                     strerror(errno));
  87                 return(-1);
  88         }
  89         if (!(ifr.ifr_flags & IFF_UP)) {
  90                 ifr.ifr_flags |= IFF_UP;
  91                 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
  92                         warnmsg(LOG_ERR, __func__,
  93                             "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
  94                 return(-1);
  95         }
  96
  97         warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
  98
  99         llflag = get_llflag(name);
 100         if (llflag < 0) {
 101                 warnmsg(LOG_WARNING, __func__,
 102                     "get_llflag() failed, anyway I'll try");
 103                 return 0;
 104         }
 105
 106         if (!(llflag & IN6_IFF_NOTREADY)) {
 107                 warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
 108                 return(0);
 109         } else {
 110                 if (llflag & IN6_IFF_TENTATIVE) {
 111                         warnmsg(LOG_DEBUG, __func__, "%s is tentative",
 112                             name);
 113                         return IFS_TENTATIVE;
 114                 }
 115                 if (llflag & IN6_IFF_DUPLICATED)
 116                         warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
 117                             name);
 118                 return -1;
 119         }
 120 }
 121
 122 int
 123 interface_status(struct ifinfo *ifinfo)
 124 {
 125         char *ifname = ifinfo->ifname;
 126         struct ifreq ifr;
 127         struct ifmediareq ifmr;
 128
 129         /* get interface flags */
 130         memset(&ifr, 0, sizeof(ifr));
 131         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 132         if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
 133                 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
 134                     ifname, strerror(errno));
 135                 return(-1);
 136         }
 137         /*
 138          * if one of UP and RUNNING flags is dropped,
 139          * the interface is not active.
 140          */
 141         if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 142                 goto inactive;
 143         }
 144
 145         /* Next, check carrier on the interface, if possible */
 146         if (!ifinfo->mediareqok)
 147                 goto active;
 148         memset(&ifmr, 0, sizeof(ifmr));
 149         strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
 150
 151         if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 152                 if (errno != EINVAL) {
 153                         warnmsg(LOG_DEBUG, __func__,
 154                             "ioctl(SIOCGIFMEDIA) on %s: %s",
 155                             ifname, strerror(errno));
 156                         return(-1);
 157                 }
 158                 /*
 159                  * EINVAL simply means that the interface does not support
 160                  * the SIOCGIFMEDIA ioctl. We regard it alive.
 161                  */
 162                 ifinfo->mediareqok = 0;
 163                 goto active;
 164         }
 165
 166         if (ifmr.ifm_status & IFM_AVALID) {
 167                 switch (ifmr.ifm_active & IFM_NMASK) {
 168                 case IFM_ETHER:
 169                         if (ifmr.ifm_status & IFM_ACTIVE)
 170                                 goto active;
 171                         else
 172                                 goto inactive;
 173                         break;
 174                 default:
 175                         goto inactive;
 176                 }
 177         }
 178
 179   inactive:
 180         return(0);
 181
 182   active:
 183         return(1);
 184 }
 185
 186 #define ROUNDUP(a, size) \
 187         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
 188
 189 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
 190         ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
 191         sizeof(u_long)) : sizeof(u_long)))
 192 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 193
 194 int
 195 lladdropt_length(struct sockaddr_dl *sdl)
 196 {
 197         switch (sdl->sdl_type) {
 198         case IFT_ETHER:
 199 #ifdef IFT_IEEE80211
 200         case IFT_IEEE80211:
 201 #endif
 202                 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
 203         default:
 204                 return(0);
 205         }
 206 }
 207
 208 void
 209 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 210 {
 211         char *addr;
 212
 213         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 214
 215         switch (sdl->sdl_type) {
 216         case IFT_ETHER:
 217 #ifdef IFT_IEEE80211
 218         case IFT_IEEE80211:
 219 #endif
 220                 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 221                 addr = (char *)(ndopt + 1);
 222                 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 223                 break;
 224         default:
 225                 warnmsg(LOG_ERR, __func__,
 226                     "unsupported link type(%d)", sdl->sdl_type);
 227                 exit(1);
 228         }
 229
 230         return;
 231 }
 232
 233 struct sockaddr_dl *
 234 if_nametosdl(char *name)
 235 {
 236         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 237         char *buf, *next, *lim;
 238         size_t len;
 239         struct if_msghdr *ifm;
 240         struct sockaddr *sa, *rti_info[RTAX_MAX];
 241         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 242
 243         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 244                 return(NULL);
 245         if ((buf = malloc(len)) == NULL)
 246                 return(NULL);
 247         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 248                 free(buf);
 249                 return(NULL);
 250         }
 251
 252         lim = buf + len;
 253         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 254                 ifm = (struct if_msghdr *)next;
 255                 if (ifm->ifm_type == RTM_IFINFO) {
 256                         sa = (struct sockaddr *)(ifm + 1);
 257                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 258                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 259                                 if (sa->sa_family == AF_LINK) {
 260                                         sdl = (struct sockaddr_dl *)sa;
 261                                         if (strlen(name) != sdl->sdl_nlen)
 262                                                 continue; /* not same len */
 263                                         if (strncmp(&sdl->sdl_data[0],
 264                                                     name,
 265                                                     sdl->sdl_nlen) == 0) {
 266                                                 break;
 267                                         }
 268                                 }
 269                         }
 270                 }
 271         }
 272         if (next == lim || sdl == NULL) {
 273                 /* search failed */
 274                 free(buf);
 275                 return(NULL);
 276         }
 277
 278         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
 279                 free(buf);
 280                 return(NULL);
 281         }
 282         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 283
 284         free(buf);
 285         return(ret_sdl);
 286 }
 287
 288 int
 289 getinet6sysctl(int code)
 290 {
 291         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 292         int value;
 293         size_t size;
 294
 295         mib[3] = code;
 296         size = sizeof(value);
 297         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
 298                 return -1;
 299         else
 300                 return value;
 301 }
 302
 303 /*------------------------------------------------------------*/
 304
 305 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 306 static int
 307 get_llflag(const char *name)
 308 {
 309         struct ifaddrs *ifap, *ifa;
 310         struct in6_ifreq ifr6;
 311         struct sockaddr_in6 *sin6;
 312         int s;
 313
 314         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 315                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 316                     strerror(errno));
 317                 exit(1);
 318         }
 319         if (getifaddrs(&ifap) != 0) {
 320                 warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
 321                     strerror(errno));
 322                 exit(1);
 323         }
 324
 325         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 326                 if (strlen(ifa->ifa_name) != strlen(name) ||
 327                     strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 328                         continue;
 329                 if (ifa->ifa_addr->sa_family != AF_INET6)
 330                         continue;
 331                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 332                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 333                         continue;
 334
 335                 memset(&ifr6, 0, sizeof(ifr6));
 336                 strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
 337                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 338                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 339                         warnmsg(LOG_ERR, __func__,
 340                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 341                         exit(1);
 342                 }
 343
 344                 freeifaddrs(ifap);
 345                 close(s);
 346                 return ifr6.ifr_ifru.ifru_flags6;
 347         }
 348
 349         freeifaddrs(ifap);
 350         close(s);
 351         return -1;
 352 }
 353
 354
 355 static void
 356 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 357 {
 358         int i;
 359
 360         for (i = 0; i < RTAX_MAX; i++) {
 361                 if (addrs & (1 << i)) {
 362                         rti_info[i] = sa;
 363                         NEXT_SA(sa);
 364                 } else
 365                         rti_info[i] = NULL;
 366         }
 367 }