usr.sbin/rtsold/if.c

   1 /*      $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun 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  * $FreeBSD$
  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 #include <net/if_var.h>
  42 #include <net/if_types.h>
  43 #include <net/route.h>
  44 #include <net/if_dl.h>
  45 #include <net/if_media.h>
  46 #include <net/ethernet.h>
  47 #include <netinet/in.h>
  48 #include <netinet/icmp6.h>
  49
  50 #include <netinet6/in6_var.h>
  51
  52 #include <stdio.h>
  53 #include <unistd.h>
  54 #include <stdlib.h>
  55 #include <syslog.h>
  56 #include <string.h>
  57 #include <fcntl.h>
  58 #include <errno.h>
  59 #include <limits.h>
  60 #include <ifaddrs.h>
  61 #include "rtsold.h"
  62
  63 extern int rssock;
  64 static int ifsock;
  65
  66 static int get_llflag(const char *);
  67 static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
  68
  69 int
  70 ifinit(void)
  71 {
  72         ifsock = rssock;
  73
  74         return(0);
  75 }
  76
  77 int
  78 interface_up(char *name)
  79 {
  80         struct ifreq ifr;
  81         int llflag;
  82
  83         strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
  84
  85         if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
  86                 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
  87                     strerror(errno));
  88                 return(-1);
  89         }
  90         if (!(ifr.ifr_flags & IFF_UP)) {
  91                 ifr.ifr_flags |= IFF_UP;
  92                 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
  93                         warnmsg(LOG_ERR, __func__,
  94                             "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
  95                 return(-1);
  96         }
  97
  98         warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
  99
 100         llflag = get_llflag(name);
 101         if (llflag < 0) {
 102                 warnmsg(LOG_WARNING, __func__,
 103                     "get_llflag() failed, anyway I'll try");
 104                 return 0;
 105         }
 106
 107         if (!(llflag & IN6_IFF_NOTREADY)) {
 108                 warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
 109                 return(0);
 110         } else {
 111                 if (llflag & IN6_IFF_TENTATIVE) {
 112                         warnmsg(LOG_DEBUG, __func__, "%s is tentative",
 113                             name);
 114                         return IFS_TENTATIVE;
 115                 }
 116                 if (llflag & IN6_IFF_DUPLICATED)
 117                         warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
 118                             name);
 119                 return -1;
 120         }
 121 }
 122
 123 int
 124 interface_status(struct ifinfo *ifinfo)
 125 {
 126         char *ifname = ifinfo->ifname;
 127         struct ifreq ifr;
 128         struct ifmediareq ifmr;
 129
 130         /* get interface flags */
 131         memset(&ifr, 0, sizeof(ifr));
 132         strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
 133         if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
 134                 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
 135                     ifname, strerror(errno));
 136                 return(-1);
 137         }
 138         /*
 139          * if one of UP and RUNNING flags is dropped,
 140          * the interface is not active.
 141          */
 142         if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
 143                 goto inactive;
 144         }
 145
 146         /* Next, check carrier on the interface, if possible */
 147         if (!ifinfo->mediareqok)
 148                 goto active;
 149         memset(&ifmr, 0, sizeof(ifmr));
 150         strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
 151
 152         if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
 153                 if (errno != EINVAL) {
 154                         warnmsg(LOG_DEBUG, __func__,
 155                             "ioctl(SIOCGIFMEDIA) on %s: %s",
 156                             ifname, strerror(errno));
 157                         return(-1);
 158                 }
 159                 /*
 160                  * EINVAL simply means that the interface does not support
 161                  * the SIOCGIFMEDIA ioctl. We regard it alive.
 162                  */
 163                 ifinfo->mediareqok = 0;
 164                 goto active;
 165         }
 166
 167         if (ifmr.ifm_status & IFM_AVALID) {
 168                 switch (ifmr.ifm_active & IFM_NMASK) {
 169                 case IFM_ETHER:
 170                 case IFM_IEEE80211:
 171                         if (ifmr.ifm_status & IFM_ACTIVE)
 172                                 goto active;
 173                         else
 174                                 goto inactive;
 175                         break;
 176                 default:
 177                         goto inactive;
 178                 }
 179         }
 180
 181   inactive:
 182         return(0);
 183
 184   active:
 185         return(1);
 186 }
 187
 188 #define ROUNDUP(a, size) \
 189         (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
 190
 191 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
 192         ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
 193         sizeof(u_long)) : sizeof(u_long)))
 194 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
 195
 196 int
 197 lladdropt_length(struct sockaddr_dl *sdl)
 198 {
 199         switch (sdl->sdl_type) {
 200         case IFT_ETHER:
 201 #ifdef IFT_IEEE80211
 202         case IFT_IEEE80211:
 203 #endif
 204                 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
 205         default:
 206                 return(0);
 207         }
 208 }
 209
 210 void
 211 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
 212 {
 213         char *addr;
 214
 215         ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
 216
 217         switch (sdl->sdl_type) {
 218         case IFT_ETHER:
 219 #ifdef IFT_IEEE80211
 220         case IFT_IEEE80211:
 221 #endif
 222                 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
 223                 addr = (char *)(ndopt + 1);
 224                 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
 225                 break;
 226         default:
 227                 warnmsg(LOG_ERR, __func__,
 228                     "unsupported link type(%d)", sdl->sdl_type);
 229                 exit(1);
 230         }
 231
 232         return;
 233 }
 234
 235 struct sockaddr_dl *
 236 if_nametosdl(char *name)
 237 {
 238         int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
 239         char *buf, *next, *lim;
 240         size_t len;
 241         struct if_msghdr *ifm;
 242         struct sockaddr *sa, *rti_info[RTAX_MAX];
 243         struct sockaddr_dl *sdl = NULL, *ret_sdl;
 244
 245         if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
 246                 return(NULL);
 247         if ((buf = malloc(len)) == NULL)
 248                 return(NULL);
 249         if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
 250                 free(buf);
 251                 return(NULL);
 252         }
 253
 254         lim = buf + len;
 255         for (next = buf; next < lim; next += ifm->ifm_msglen) {
 256                 ifm = (struct if_msghdr *)next;
 257                 if (ifm->ifm_type == RTM_IFINFO) {
 258                         sa = (struct sockaddr *)(ifm + 1);
 259                         get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
 260                         if ((sa = rti_info[RTAX_IFP]) != NULL) {
 261                                 if (sa->sa_family == AF_LINK) {
 262                                         sdl = (struct sockaddr_dl *)sa;
 263                                         if (strlen(name) != sdl->sdl_nlen)
 264                                                 continue; /* not same len */
 265                                         if (strncmp(&sdl->sdl_data[0],
 266                                                     name,
 267                                                     sdl->sdl_nlen) == 0) {
 268                                                 break;
 269                                         }
 270                                 }
 271                         }
 272                 }
 273         }
 274         if (next == lim) {
 275                 /* search failed */
 276                 free(buf);
 277                 return(NULL);
 278         }
 279
 280         if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
 281                 free(buf);
 282                 return(NULL);
 283         }
 284         memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
 285
 286         free(buf);
 287         return(ret_sdl);
 288 }
 289
 290 int
 291 getinet6sysctl(int code)
 292 {
 293         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 294         int value;
 295         size_t size;
 296
 297         mib[3] = code;
 298         size = sizeof(value);
 299         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
 300                 return -1;
 301         else
 302                 return value;
 303 }
 304
 305 int
 306 setinet6sysctl(int code, int newval)
 307 {
 308         int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
 309         int value;
 310         size_t size;
 311
 312         mib[3] = code;
 313         size = sizeof(value);
 314         if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size,
 315             &newval, sizeof(newval)) < 0)
 316                 return -1;
 317         else
 318                 return value;
 319 }
 320
 321 /*------------------------------------------------------------*/
 322
 323 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
 324 static int
 325 get_llflag(const char *name)
 326 {
 327         struct ifaddrs *ifap, *ifa;
 328         struct in6_ifreq ifr6;
 329         struct sockaddr_in6 *sin6;
 330         int s;
 331
 332         if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
 333                 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
 334                     strerror(errno));
 335                 exit(1);
 336         }
 337         if (getifaddrs(&ifap) != 0) {
 338                 warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
 339                     strerror(errno));
 340                 exit(1);
 341         }
 342
 343         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 344                 if (strlen(ifa->ifa_name) != strlen(name) ||
 345                     strncmp(ifa->ifa_name, name, strlen(name)) != 0)
 346                         continue;
 347                 if (ifa->ifa_addr->sa_family != AF_INET6)
 348                         continue;
 349                 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 350                 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
 351                         continue;
 352
 353                 memset(&ifr6, 0, sizeof(ifr6));
 354                 strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
 355                 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
 356                 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
 357                         warnmsg(LOG_ERR, __func__,
 358                             "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
 359                         exit(1);
 360                 }
 361
 362                 freeifaddrs(ifap);
 363                 close(s);
 364                 return ifr6.ifr_ifru.ifru_flags6;
 365         }
 366
 367         freeifaddrs(ifap);
 368         close(s);
 369         return -1;
 370 }
 371
 372
 373 static void
 374 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 375 {
 376         int i;
 377
 378         for (i = 0; i < RTAX_MAX; i++) {
 379                 if (addrs & (1 << i)) {
 380                         rti_info[i] = sa;
 381                         NEXT_SA(sa);
 382                 } else
 383                         rti_info[i] = NULL;
 384         }
 385 }