xref: /freebsd/usr.sbin/rtsold/if.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
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  * $FreeBSD$
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(__FreeBSD__) && __FreeBSD__ >= 3
42 #include <net/if_var.h>
43 #endif /* __FreeBSD__ >= 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 __FreeBSD__
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 __P((const char *name));
81 #ifndef HAVE_GETIFADDRS
82 static unsigned int if_maxindex __P((void));
83 #endif
84 static void get_rtaddrs __P((int addrs, struct sockaddr *sa,
85 			     struct sockaddr **rti_info));
86 
87 int
88 ifinit()
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, __FUNCTION__, "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, __FUNCTION__,
112 				"ioctl(SIOCSIFFLAGS): %s", strerror(errno));
113 		}
114 		return(-1);
115 	}
116 
117 	warnmsg(LOG_DEBUG, __FUNCTION__, "checking if %s is ready...", name);
118 
119 	llflag = get_llflag(name);
120 	if (llflag < 0) {
121 		warnmsg(LOG_WARNING, __FUNCTION__,
122 			"get_llflag() failed, anyway I'll try");
123 		return 0;
124 	}
125 
126 	if (!(llflag & IN6_IFF_NOTREADY)) {
127 		warnmsg(LOG_DEBUG, __FUNCTION__,
128 			"%s is ready", name);
129 		return(0);
130 	} else {
131 		if (llflag & IN6_IFF_TENTATIVE) {
132 			warnmsg(LOG_DEBUG, __FUNCTION__, "%s is tentative",
133 			       name);
134 			return IFS_TENTATIVE;
135 		}
136 		if (llflag & IN6_IFF_DUPLICATED)
137 			warnmsg(LOG_DEBUG, __FUNCTION__, "%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, __FUNCTION__, "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, __FUNCTION__,
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 ROUNDUP(a, size) \
208 	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
209 
210 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
211 	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
212 						 sizeof(u_long)) :\
213 			  			 sizeof(u_long)))
214 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
215 
216 int
217 lladdropt_length(struct sockaddr_dl *sdl)
218 {
219 	switch(sdl->sdl_type) {
220 	 case IFT_ETHER:
221 #ifdef IFT_IEEE80211
222 	case IFT_IEEE80211:
223 #endif
224 		 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
225 	 default:
226 		 return(0);
227 	}
228 }
229 
230 void
231 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
232 {
233 	char *addr;
234 
235 	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
236 
237 	switch(sdl->sdl_type) {
238 	 case IFT_ETHER:
239 #ifdef IFT_IEEE80211
240 	case IFT_IEEE80211:
241 #endif
242 		 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
243 		 addr = (char *)(ndopt + 1);
244 		 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
245 		 break;
246 	 default:
247 		 warnmsg(LOG_ERR, __FUNCTION__,
248 			 "unsupported link type(%d)", sdl->sdl_type);
249 		 exit(1);
250 	}
251 
252 	return;
253 }
254 
255 struct sockaddr_dl *
256 if_nametosdl(char *name)
257 {
258 	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
259 	char *buf, *next, *lim;
260 	size_t len;
261 	struct if_msghdr *ifm;
262 	struct sockaddr *sa, *rti_info[RTAX_MAX];
263 	struct sockaddr_dl *sdl = NULL, *ret_sdl;
264 
265 	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
266 		return(NULL);
267 	if ((buf = malloc(len)) == NULL)
268 		return(NULL);
269 	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
270 		free(buf);
271 		return(NULL);
272 	}
273 
274 	lim = buf + len;
275 	for (next = buf; next < lim; next += ifm->ifm_msglen) {
276 		ifm = (struct if_msghdr *)next;
277 		if (ifm->ifm_type == RTM_IFINFO) {
278 			sa = (struct sockaddr *)(ifm + 1);
279 			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
280 			if ((sa = rti_info[RTAX_IFP]) != NULL) {
281 				if (sa->sa_family == AF_LINK) {
282 					sdl = (struct sockaddr_dl *)sa;
283 					if (strlen(name) != sdl->sdl_nlen)
284 						continue; /* not same len */
285 					if (strncmp(&sdl->sdl_data[0],
286 						    name,
287 						    sdl->sdl_nlen) == 0) {
288 						break;
289 					}
290 				}
291 			}
292 		}
293 	}
294 	if (next == lim) {
295 		/* search failed */
296 		free(buf);
297 		return(NULL);
298 	}
299 
300 	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
301 		return(NULL);
302 	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
303 
304 	free(buf);
305 	return(ret_sdl);
306 }
307 
308 int
309 getinet6sysctl(int code)
310 {
311 	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
312 	int value;
313 	size_t size;
314 
315 	mib[3] = code;
316 	size = sizeof(value);
317 	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
318 		return -1;
319 	else
320 		return value;
321 }
322 
323 /*------------------------------------------------------------*/
324 
325 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
326 static int
327 get_llflag(const char *name)
328 {
329 #ifdef HAVE_GETIFADDRS
330 	struct ifaddrs *ifap, *ifa;
331 	struct in6_ifreq ifr6;
332 	struct sockaddr_in6 *sin6;
333 	int s;
334 
335 	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
336 		warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
337 		    strerror(errno));
338 		exit(1);
339 	}
340 	if (getifaddrs(&ifap) != 0) {
341 		warnmsg(LOG_ERR, __FUNCTION__, "etifaddrs: %s",
342 		    strerror(errno));
343 		exit(1);
344 	}
345 
346 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
347 		if (strlen(ifa->ifa_name) != strlen(name)
348 		 || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
349 			continue;
350 		if (ifa->ifa_addr->sa_family != AF_INET6)
351 			continue;
352 		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
353 		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
354 			continue;
355 
356 		memset(&ifr6, 0, sizeof(ifr6));
357 		strcpy(ifr6.ifr_name, name);
358 		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
359 		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
360 			warnmsg(LOG_ERR, __FUNCTION__,
361 			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
362 			exit(1);
363 		}
364 
365 		freeifaddrs(ifap);
366 		close(s);
367 		return ifr6.ifr_ifru.ifru_flags6;
368 	}
369 
370 	freeifaddrs(ifap);
371 	close(s);
372 	return -1;
373 #else
374 	int s;
375 	unsigned int maxif;
376 	struct ifreq *iflist;
377 	struct ifconf ifconf;
378 	struct ifreq *ifr, *ifr_end;
379 	struct sockaddr_in6 *sin6;
380 	struct in6_ifreq ifr6;
381 
382 	maxif = if_maxindex() + 1;
383 	iflist = (struct ifreq *)malloc(maxif * BUFSIZ);	/* XXX */
384 	if (iflist == NULL) {
385 		warnmsg(LOG_ERR, __FUNCTION__, "not enough core");
386 		exit(1);
387 	}
388 
389 	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
390 		warnmsg(LOG_ERR, __FUNCTION__, "socket(SOCK_DGRAM): %s",
391 		    strerror(errno));
392 		exit(1);
393 	}
394 	memset(&ifconf, 0, sizeof(ifconf));
395 	ifconf.ifc_req = iflist;
396 	ifconf.ifc_len = maxif * BUFSIZ;	/* XXX */
397 	if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
398 		warnmsg(LOG_ERR, __FUNCTION__, "ioctl(SIOCGIFCONF): %s",
399 		    strerror(errno));
400 		exit(1);
401 	}
402 
403 	/* Look for this interface in the list */
404 	ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
405 	for (ifr = ifconf.ifc_req;
406 	     ifr < ifr_end;
407 	     ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
408 				    + ifr->ifr_addr.sa_len)) {
409 		if (strlen(ifr->ifr_name) != strlen(name)
410 		 || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
411 			continue;
412 		if (ifr->ifr_addr.sa_family != AF_INET6)
413 			continue;
414 		sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
415 		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
416 			continue;
417 
418 		memset(&ifr6, 0, sizeof(ifr6));
419 		strcpy(ifr6.ifr_name, name);
420 		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
421 		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
422 			warnmsg(LOG_ERR, __FUNCTION__,
423 			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
424 			exit(1);
425 		}
426 
427 		free(iflist);
428 		close(s);
429 		return ifr6.ifr_ifru.ifru_flags6;
430 	}
431 
432 	free(iflist);
433 	close(s);
434 	return -1;
435 #endif
436 }
437 
438 #ifndef HAVE_GETIFADDRS
439 static unsigned int
440 if_maxindex()
441 {
442 	struct if_nameindex *p, *p0;
443 	unsigned int max = 0;
444 
445 	p0 = if_nameindex();
446 	for (p = p0; p && p->if_index && p->if_name; p++) {
447 		if (max < p->if_index)
448 			max = p->if_index;
449 	}
450 	if_freenameindex(p0);
451 	return max;
452 }
453 #endif
454 
455 static void
456 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
457 {
458 	int i;
459 
460 	for (i = 0; i < RTAX_MAX; i++) {
461 		if (addrs & (1 << i)) {
462 			rti_info[i] = sa;
463 			NEXT_SA(sa);
464 		}
465 		else
466 			rti_info[i] = NULL;
467 	}
468 }
469