1 /* $KAME: if.c,v 1.27 2003/10/05 00:09:36 itojun Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * $FreeBSD$
34 */
35
36 #include <sys/param.h>
37 #include <sys/socket.h>
38 #include <sys/sysctl.h>
39 #include <sys/ioctl.h>
40 #include <sys/queue.h>
41
42 #include <net/if.h>
43 #include <net/if_types.h>
44 #include <net/route.h>
45 #include <net/if_dl.h>
46 #include <net/if_media.h>
47 #include <net/ethernet.h>
48 #include <netinet/in.h>
49 #include <netinet/icmp6.h>
50
51 #include <netinet6/in6_var.h>
52 #include <netinet6/nd6.h>
53
54 #include <stdio.h>
55 #include <unistd.h>
56 #include <stdlib.h>
57 #include <syslog.h>
58 #include <string.h>
59 #include <fcntl.h>
60 #include <errno.h>
61 #include <limits.h>
62 #include <ifaddrs.h>
63 #include "rtsold.h"
64
65 static int ifsock;
66
67 static int get_llflag(const char *);
68 static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
69
70 int
ifinit(void)71 ifinit(void)
72 {
73 ifsock = rssock;
74
75 return(0);
76 }
77
78 int
interface_up(char * name)79 interface_up(char *name)
80 {
81 struct ifreq ifr;
82 struct in6_ndireq nd;
83 int llflag;
84 int s;
85
86 memset(&ifr, 0, sizeof(ifr));
87 strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
88 memset(&nd, 0, sizeof(nd));
89 strlcpy(nd.ifname, name, sizeof(nd.ifname));
90
91 if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
92 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
93 strerror(errno));
94 return (-1);
95 }
96 if (!(ifr.ifr_flags & IFF_UP)) {
97 ifr.ifr_flags |= IFF_UP;
98 if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
99 warnmsg(LOG_ERR, __func__,
100 "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
101 return (-1);
102 }
103 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
104 warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s",
105 strerror(errno));
106 return (-1);
107 }
108 if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
109 warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s",
110 strerror(errno));
111 close(s);
112 return (-1);
113 }
114
115 warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
116
117 if (nd.ndi.flags & ND6_IFF_IFDISABLED) {
118 if (Fflag) {
119 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
120 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
121 warnmsg(LOG_WARNING, __func__,
122 "ioctl(SIOCSIFINFO_IN6): %s",
123 strerror(errno));
124 close(s);
125 return (-1);
126 }
127 } else {
128 warnmsg(LOG_WARNING, __func__,
129 "%s is disabled.", name);
130 close(s);
131 return (-1);
132 }
133 }
134 if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) {
135 if (Fflag) {
136 nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
137 if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
138 warnmsg(LOG_WARNING, __func__,
139 "ioctl(SIOCSIFINFO_IN6): %s",
140 strerror(errno));
141 close(s);
142 return (-1);
143 }
144 } else {
145 warnmsg(LOG_WARNING, __func__,
146 "%s does not accept Router Advertisement.", name);
147 close(s);
148 return (-1);
149 }
150 }
151 close(s);
152
153 llflag = get_llflag(name);
154 if (llflag < 0) {
155 warnmsg(LOG_WARNING, __func__,
156 "get_llflag() failed, anyway I'll try");
157 return (0);
158 }
159
160 if (!(llflag & IN6_IFF_NOTREADY)) {
161 warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
162 return (0);
163 } else {
164 if (llflag & IN6_IFF_TENTATIVE) {
165 warnmsg(LOG_DEBUG, __func__, "%s is tentative",
166 name);
167 return (IFS_TENTATIVE);
168 }
169 if (llflag & IN6_IFF_DUPLICATED)
170 warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
171 name);
172 return (-1);
173 }
174 }
175
176 int
interface_status(struct ifinfo * ifinfo)177 interface_status(struct ifinfo *ifinfo)
178 {
179 char *ifname = ifinfo->ifname;
180 struct ifreq ifr;
181 struct ifmediareq ifmr;
182
183 /* get interface flags */
184 memset(&ifr, 0, sizeof(ifr));
185 strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
186 if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
187 warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
188 ifname, strerror(errno));
189 return (-1);
190 }
191 /*
192 * if one of UP and RUNNING flags is dropped,
193 * the interface is not active.
194 */
195 if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
196 goto inactive;
197 /* Next, check carrier on the interface, if possible */
198 if (!ifinfo->mediareqok)
199 goto active;
200 memset(&ifmr, 0, sizeof(ifmr));
201 strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
202
203 if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
204 if (errno != EINVAL) {
205 warnmsg(LOG_DEBUG, __func__,
206 "ioctl(SIOCGIFMEDIA) on %s: %s",
207 ifname, strerror(errno));
208 return(-1);
209 }
210 /*
211 * EINVAL simply means that the interface does not support
212 * the SIOCGIFMEDIA ioctl. We regard it alive.
213 */
214 ifinfo->mediareqok = 0;
215 goto active;
216 }
217
218 if (ifmr.ifm_status & IFM_AVALID) {
219 switch (ifmr.ifm_active & IFM_NMASK) {
220 case IFM_ETHER:
221 case IFM_IEEE80211:
222 if (ifmr.ifm_status & IFM_ACTIVE)
223 goto active;
224 else
225 goto inactive;
226 break;
227 default:
228 goto inactive;
229 }
230 }
231
232 inactive:
233 return (0);
234
235 active:
236 return (1);
237 }
238
239 #define ROUNDUP(a, size) \
240 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
241
242 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
243 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
244 sizeof(u_long)) : sizeof(u_long)))
245 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
246
247 int
lladdropt_length(struct sockaddr_dl * sdl)248 lladdropt_length(struct sockaddr_dl *sdl)
249 {
250 switch (sdl->sdl_type) {
251 case IFT_ETHER:
252 return (ROUNDUP8(ETHER_ADDR_LEN + 2));
253 default:
254 return (0);
255 }
256 }
257
258 void
lladdropt_fill(struct sockaddr_dl * sdl,struct nd_opt_hdr * ndopt)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 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
268 addr = (char *)(ndopt + 1);
269 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
270 break;
271 default:
272 warnmsg(LOG_ERR, __func__,
273 "unsupported link type(%d)", sdl->sdl_type);
274 exit(1);
275 }
276
277 return;
278 }
279
280 struct sockaddr_dl *
if_nametosdl(char * name)281 if_nametosdl(char *name)
282 {
283 int mib[] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
284 char *buf, *next, *lim;
285 size_t len;
286 struct if_msghdr *ifm;
287 struct sockaddr *sa, *rti_info[RTAX_MAX];
288 struct sockaddr_dl *sdl = NULL, *ret_sdl;
289
290 if (sysctl(mib, nitems(mib), NULL, &len, NULL, 0) < 0)
291 return(NULL);
292 if ((buf = malloc(len)) == NULL)
293 return(NULL);
294 if (sysctl(mib, nitems(mib), buf, &len, NULL, 0) < 0) {
295 free(buf);
296 return (NULL);
297 }
298
299 lim = buf + len;
300 for (next = buf; next < lim; next += ifm->ifm_msglen) {
301 ifm = (struct if_msghdr *)(void *)next;
302 if (ifm->ifm_type == RTM_IFINFO) {
303 sa = (struct sockaddr *)(ifm + 1);
304 get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
305 if ((sa = rti_info[RTAX_IFP]) != NULL) {
306 if (sa->sa_family == AF_LINK) {
307 sdl = (struct sockaddr_dl *)(void *)sa;
308 if (strlen(name) != sdl->sdl_nlen)
309 continue; /* not same len */
310 if (strncmp(&sdl->sdl_data[0],
311 name,
312 sdl->sdl_nlen) == 0) {
313 break;
314 }
315 }
316 }
317 }
318 }
319 if (next == lim) {
320 /* search failed */
321 free(buf);
322 return (NULL);
323 }
324
325 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
326 free(buf);
327 return (NULL);
328 }
329 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
330
331 free(buf);
332 return (ret_sdl);
333 }
334
335 /*------------------------------------------------------------*/
336
337 /* get ia6_flags for link-local addr on if. returns -1 on error. */
338 static int
get_llflag(const char * name)339 get_llflag(const char *name)
340 {
341 struct ifaddrs *ifap, *ifa;
342 struct in6_ifreq ifr6;
343 struct sockaddr_in6 *sin6;
344 int s;
345
346 if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
347 warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
348 strerror(errno));
349 exit(1);
350 }
351 if (getifaddrs(&ifap) != 0) {
352 warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
353 strerror(errno));
354 exit(1);
355 }
356
357 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
358 if (strlen(ifa->ifa_name) != strlen(name) ||
359 strncmp(ifa->ifa_name, name, strlen(name)) != 0)
360 continue;
361 if (ifa->ifa_addr->sa_family != AF_INET6)
362 continue;
363 sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
364 if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
365 continue;
366
367 memset(&ifr6, 0, sizeof(ifr6));
368 strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
369 memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
370 if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
371 warnmsg(LOG_ERR, __func__,
372 "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
373 exit(1);
374 }
375
376 freeifaddrs(ifap);
377 close(s);
378 return (ifr6.ifr_ifru.ifru_flags6);
379 }
380
381 freeifaddrs(ifap);
382 close(s);
383 return (-1);
384 }
385
386
387 static void
get_rtaddrs(int addrs,struct sockaddr * sa,struct sockaddr ** rti_info)388 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
389 {
390 int i;
391
392 for (i = 0; i < RTAX_MAX; i++) {
393 if (addrs & (1 << i)) {
394 rti_info[i] = sa;
395 NEXT_SA(sa);
396 } else
397 rti_info[i] = NULL;
398 }
399 }
400