sbin/ifconfig/tunnel.c

   1 /*      $NetBSD: tunnel.c,v 1.20 2013/10/19 15:59:15 christos Exp $     */
   2
   3 /*
   4  * Copyright (c) 1983, 1993
   5  *      The Regents of the University of California.  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 University 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 REGENTS 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 REGENTS 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
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __RCSID("$NetBSD: tunnel.c,v 1.20 2013/10/19 15:59:15 christos Exp $");
  35 #endif /* not lint */
  36
  37 #include <sys/param.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/socket.h>
  40
  41 #include <net/if.h>
  42
  43 #ifdef INET6
  44 #include <netinet/in.h>
  45 #endif
  46
  47 #include <ctype.h>
  48 #include <err.h>
  49 #include <errno.h>
  50 #include <netdb.h>
  51 #include <string.h>
  52 #include <stdlib.h>
  53 #include <stdio.h>
  54 #include <util.h>
  55
  56 #include "env.h"
  57 #include "extern.h"
  58 #include "parse.h"
  59 #include "util.h"
  60
  61 static status_func_t status;
  62 static usage_func_t usage;
  63 static cmdloop_branch_t branch;
  64
  65 static void tunnel_constructor(void) __attribute__((constructor));
  66 static int settunnel(prop_dictionary_t, prop_dictionary_t);
  67 static int deletetunnel(prop_dictionary_t, prop_dictionary_t);
  68 static void tunnel_status(prop_dictionary_t, prop_dictionary_t);
  69
  70 struct paddr tundst = PADDR_INITIALIZER(&tundst, "tundst", settunnel,
  71     "tundst", NULL, NULL, NULL, &command_root.pb_parser);
  72
  73 struct paddr tunsrc = PADDR_INITIALIZER(&tunsrc, "tunsrc", NULL,
  74     "tunsrc", NULL, NULL, NULL, &tundst.pa_parser);
  75
  76 static const struct kwinst tunnelkw[] = {
  77           {.k_word = "deletetunnel", .k_exec = deletetunnel,
  78            .k_nextparser = &command_root.pb_parser}
  79         , {.k_word = "tunnel", .k_nextparser = &tunsrc.pa_parser}
  80 };
  81
  82 struct pkw tunnel = PKW_INITIALIZER(&tunnel, "tunnel", NULL, NULL,
  83     tunnelkw, __arraycount(tunnelkw), NULL);
  84
  85 static int
  86 settunnel(prop_dictionary_t env, prop_dictionary_t oenv)
  87 {
  88         const struct paddr_prefix *srcpfx, *dstpfx;
  89         struct if_laddrreq req;
  90         prop_data_t srcdata, dstdata;
  91
  92         srcdata = (prop_data_t)prop_dictionary_get(env, "tunsrc");
  93         dstdata = (prop_data_t)prop_dictionary_get(env, "tundst");
  94
  95         if (srcdata == NULL || dstdata == NULL) {
  96                 warnx("%s.%d", __func__, __LINE__);
  97                 errno = ENOENT;
  98                 return -1;
  99         }
 100
 101         srcpfx = prop_data_data_nocopy(srcdata);
 102         dstpfx = prop_data_data_nocopy(dstdata);
 103
 104         if (srcpfx->pfx_addr.sa_family != dstpfx->pfx_addr.sa_family)
 105                 errx(EXIT_FAILURE,
 106                     "source and destination address families do not match");
 107
 108         memset(&req, 0, sizeof(req));
 109         memcpy(&req.addr, &srcpfx->pfx_addr,
 110             MIN(sizeof(req.addr), srcpfx->pfx_addr.sa_len));
 111         memcpy(&req.dstaddr, &dstpfx->pfx_addr,
 112             MIN(sizeof(req.dstaddr), dstpfx->pfx_addr.sa_len));
 113
 114 #ifdef INET6
 115         if (req.addr.ss_family == AF_INET6) {
 116                 struct sockaddr_in6 *s6, *d;
 117
 118                 s6 = (struct sockaddr_in6 *)&req.addr;
 119                 d = (struct sockaddr_in6 *)&req.dstaddr;
 120                 if (s6->sin6_scope_id != d->sin6_scope_id) {
 121                         errx(EXIT_FAILURE, "scope mismatch");
 122                         /* NOTREACHED */
 123                 }
 124                 if (IN6_IS_ADDR_MULTICAST(&d->sin6_addr) ||
 125                     IN6_IS_ADDR_MULTICAST(&s6->sin6_addr))
 126                         errx(EXIT_FAILURE, "tunnel src/dst is multicast");
 127                 /* embed scopeid */
 128                 inet6_putscopeid(s6, INET6_IS_ADDR_LINKLOCAL);
 129                 inet6_putscopeid(d, INET6_IS_ADDR_LINKLOCAL);
 130         }
 131 #endif /* INET6 */
 132
 133         if (direct_ioctl(env, SIOCSLIFPHYADDR, &req) == -1)
 134                 warn("SIOCSLIFPHYADDR");
 135         return 0;
 136 }
 137
 138 static int
 139 deletetunnel(prop_dictionary_t env, prop_dictionary_t oenv)
 140 {
 141         if (indirect_ioctl(env, SIOCDIFPHYADDR, NULL) == -1)
 142                 err(EXIT_FAILURE, "SIOCDIFPHYADDR");
 143         return 0;
 144 }
 145
 146 static void
 147 tunnel_status(prop_dictionary_t env, prop_dictionary_t oenv)
 148 {
 149         char dstserv[sizeof(",65535")];
 150         char srcserv[sizeof(",65535")];
 151         char psrcaddr[NI_MAXHOST];
 152         char pdstaddr[NI_MAXHOST];
 153         const int niflag = Nflag ? 0 : (NI_NUMERICHOST|NI_NUMERICSERV);
 154         struct if_laddrreq req;
 155         const struct afswtch *afp;
 156
 157         psrcaddr[0] = pdstaddr[0] = '\0';
 158
 159         memset(&req, 0, sizeof(req));
 160         if (direct_ioctl(env, SIOCGLIFPHYADDR, &req) == -1)
 161                 return;
 162         afp = lookup_af_bynum(req.addr.ss_family);
 163 #ifdef INET6
 164         if (req.addr.ss_family == AF_INET6)
 165                 inet6_getscopeid((struct sockaddr_in6 *)&req.addr,
 166                     INET6_IS_ADDR_LINKLOCAL);
 167 #endif /* INET6 */
 168         getnameinfo((struct sockaddr *)&req.addr, req.addr.ss_len,
 169             psrcaddr, sizeof(psrcaddr), &srcserv[1], sizeof(srcserv) - 1,
 170             niflag);
 171
 172 #ifdef INET6
 173         if (req.dstaddr.ss_family == AF_INET6)
 174                 inet6_getscopeid((struct sockaddr_in6 *)&req.dstaddr,
 175                     INET6_IS_ADDR_LINKLOCAL);
 176 #endif
 177         getnameinfo((struct sockaddr *)&req.dstaddr, req.dstaddr.ss_len,
 178             pdstaddr, sizeof(pdstaddr), &dstserv[1], sizeof(dstserv) - 1,
 179             niflag);
 180
 181         srcserv[0] = (strcmp(&srcserv[1], "0") == 0) ? '\0' : ',';
 182         dstserv[0] = (strcmp(&dstserv[1], "0") == 0) ? '\0' : ',';
 183
 184         printf("\ttunnel %s %s%s --> %s%s\n", afp ? afp->af_name : "???",
 185             psrcaddr, srcserv, pdstaddr, dstserv);
 186 }
 187
 188 static void
 189 tunnel_usage(prop_dictionary_t env)
 190 {
 191         fprintf(stderr,
 192             "\t[ [ af ] tunnel src_addr dest_addr ] [ deletetunnel ]\n");
 193 }
 194
 195 static void
 196 tunnel_constructor(void)
 197 {
 198         cmdloop_branch_init(&branch, &tunnel.pk_parser);
 199         register_cmdloop_branch(&branch);
 200         status_func_init(&status, tunnel_status);
 201         usage_func_init(&usage, tunnel_usage);
 202         register_status(&status);
 203         register_usage(&usage);
 204 }