xref: /dragonfly/usr.sbin/rtsold/if.c (revision 0bb9290e) 
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: src/usr.sbin/rtsold/if.c,v 1.2.2.3 2001/07/03 11:02:16 ume Exp $
32  * $DragonFly: src/usr.sbin/rtsold/if.c,v 1.6 2005/12/05 00:56:37 swildner Exp $
33  */
34 
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/sysctl.h>
38 #include <sys/ioctl.h>
39 #include <sys/queue.h>
40 
41 #include <net/if.h>
42 #if defined(__DragonFly__)
43 #include <net/if_var.h>
44 #endif /* __DragonFly__ >= 3 */
45 #include <net/if_types.h>
46 #include <net/route.h>
47 #include <net/if_dl.h>
48 #include <net/if_media.h>
49 #ifdef __DragonFly__
50 # include <net/ethernet.h>
51 #endif
52 #ifdef __NetBSD__
53 #include <net/if_ether.h>
54 #endif
55 #if defined(__bsdi__) || defined(__OpenBSD__)
56 # include <netinet/in.h>
57 # include <netinet/if_ether.h>
58 #endif
59 #include <netinet/in.h>
60 #include <netinet/icmp6.h>
61 
62 #include <netinet6/in6_var.h>
63 
64 #include <stdio.h>
65 #include <unistd.h>
66 #include <stdlib.h>
67 #include <syslog.h>
68 #include <string.h>
69 #include <fcntl.h>
70 #include <errno.h>
71 #include <limits.h>
72 #ifdef HAVE_GETIFADDRS
73 #include <ifaddrs.h>
74 #endif
75 
76 #include "rtsold.h"
77 
78 extern int rssock;
79 static int ifsock;
80 
81 static int get_llflag(const char *name);
82 #ifndef HAVE_GETIFADDRS
83 static unsigned int if_maxindex(void);
84 #endif
85 static void get_rtaddrs(int addrs, struct sockaddr *sa,
86 			     struct sockaddr **rti_info);
87 
88 int
89 ifinit(void)
90 {
91 	ifsock = rssock;
92 
93 	return(0);
94 }
95 
96 int
97 interface_up(char *name)
98 {
99 	struct ifreq ifr;
100 	int llflag;
101 
102 	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
103 
104 	if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
105 		warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
106 		       strerror(errno));
107 		return(-1);
108 	}
109 	if (!(ifr.ifr_flags & IFF_UP)) {
110 		ifr.ifr_flags |= IFF_UP;
111 		if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0) {
112 			warnmsg(LOG_ERR, __func__,
113 				"ioctl(SIOCSIFFLAGS): %s", strerror(errno));
114 		}
115 		return(-1);
116 	}
117 
118 	warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
119 
120 	llflag = get_llflag(name);
121 	if (llflag < 0) {
122 		warnmsg(LOG_WARNING, __func__,
123 			"get_llflag() failed, anyway I'll try");
124 		return 0;
125 	}
126 
127 	if (!(llflag & IN6_IFF_NOTREADY)) {
128 		warnmsg(LOG_DEBUG, __func__,
129 			"%s is ready", name);
130 		return(0);
131 	} else {
132 		if (llflag & IN6_IFF_TENTATIVE) {
133 			warnmsg(LOG_DEBUG, __func__, "%s is tentative",
134 			       name);
135 			return IFS_TENTATIVE;
136 		}
137 		if (llflag & IN6_IFF_DUPLICATED)
138 			warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
139 			       name);
140 		return -1;
141 	}
142 }
143 
144 int
145 interface_status(struct ifinfo *ifinfo)
146 {
147 	char *ifname = ifinfo->ifname;
148 	struct ifreq ifr;
149 	struct ifmediareq ifmr;
150 
151 	/* get interface flags */
152 	memset(&ifr, 0, sizeof(ifr));
153 	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
154 	if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
155 		warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
156 		       ifname, strerror(errno));
157 		return(-1);
158 	}
159 	/*
160 	 * if one of UP and RUNNING flags is dropped,
161 	 * the interface is not active.
162 	 */
163 	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
164 		goto inactive;
165 	}
166 
167 	/* Next, check carrier on the interface, if possible */
168 	if (!ifinfo->mediareqok)
169 		goto active;
170 	memset(&ifmr, 0, sizeof(ifmr));
171 	strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
172 
173 	if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
174 		if (errno != EINVAL) {
175 			warnmsg(LOG_DEBUG, __func__,
176 				"ioctl(SIOCGIFMEDIA) on %s: %s",
177 			       ifname, strerror(errno));
178 			return(-1);
179 		}
180 		/*
181 		 * EINVAL simply means that the interface does not support
182 		 * the SIOCGIFMEDIA ioctl. We regard it alive.
183 		 */
184 		ifinfo->mediareqok = 0;
185 		goto active;
186 	}
187 
188 	if (ifmr.ifm_status & IFM_AVALID) {
189 		switch(ifmr.ifm_active & IFM_NMASK) {
190 		 case IFM_ETHER:
191 			 if (ifmr.ifm_status & IFM_ACTIVE)
192 				 goto active;
193 			 else
194 				 goto inactive;
195 			 break;
196 		 default:
197 			 goto inactive;
198 		}
199 	}
200 
201   inactive:
202 	return(0);
203 
204   active:
205 	return(1);
206 }
207 
208 #define ROUNDUP(a, size) \
209 	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
210 
211 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \
212 	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
213 						 sizeof(u_long)) :\
214 			  			 sizeof(u_long)))
215 #define ROUNDUP8(a) (1 + (((a) - 1) | 7))
216 
217 int
218 lladdropt_length(struct sockaddr_dl *sdl)
219 {
220 	switch(sdl->sdl_type) {
221 	 case IFT_ETHER:
222 #ifdef IFT_IEEE80211
223 	case IFT_IEEE80211:
224 #endif
225 		 return(ROUNDUP8(ETHER_ADDR_LEN + 2));
226 	 default:
227 		 return(0);
228 	}
229 }
230 
231 void
232 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
233 {
234 	char *addr;
235 
236 	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
237 
238 	switch(sdl->sdl_type) {
239 	 case IFT_ETHER:
240 #ifdef IFT_IEEE80211
241 	case IFT_IEEE80211:
242 #endif
243 		 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
244 		 addr = (char *)(ndopt + 1);
245 		 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
246 		 break;
247 	 default:
248 		 warnmsg(LOG_ERR, __func__,
249 			 "unsupported link type(%d)", sdl->sdl_type);
250 		 exit(1);
251 	}
252 
253 	return;
254 }
255 
256 struct sockaddr_dl *
257 if_nametosdl(char *name)
258 {
259 	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
260 	char *buf, *next, *lim;
261 	size_t len;
262 	struct if_msghdr *ifm;
263 	struct sockaddr *sa, *rti_info[RTAX_MAX];
264 	struct sockaddr_dl *sdl = NULL, *ret_sdl;
265 
266 	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
267 		return(NULL);
268 	if ((buf = malloc(len)) == NULL)
269 		return(NULL);
270 	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
271 		free(buf);
272 		return(NULL);
273 	}
274 
275 	lim = buf + len;
276 	for (next = buf; next < lim; next += ifm->ifm_msglen) {
277 		ifm = (struct if_msghdr *)next;
278 		if (ifm->ifm_type == RTM_IFINFO) {
279 			sa = (struct sockaddr *)(ifm + 1);
280 			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
281 			if ((sa = rti_info[RTAX_IFP]) != NULL) {
282 				if (sa->sa_family == AF_LINK) {
283 					sdl = (struct sockaddr_dl *)sa;
284 					if (strlen(name) != sdl->sdl_nlen)
285 						continue; /* not same len */
286 					if (strncmp(&sdl->sdl_data[0],
287 						    name,
288 						    sdl->sdl_nlen) == 0) {
289 						break;
290 					}
291 				}
292 			}
293 		}
294 	}
295 	if (next == lim) {
296 		/* search failed */
297 		free(buf);
298 		return(NULL);
299 	}
300 
301 	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL)
302 		return(NULL);
303 	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
304 
305 	free(buf);
306 	return(ret_sdl);
307 }
308 
309 int
310 getinet6sysctl(int code)
311 {
312 	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
313 	int value;
314 	size_t size;
315 
316 	mib[3] = code;
317 	size = sizeof(value);
318 	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
319 		return -1;
320 	else
321 		return value;
322 }
323 
324 /*------------------------------------------------------------*/
325 
326 /* get ia6_flags for link-local addr on if.  returns -1 on error. */
327 static int
328 get_llflag(const char *name)
329 {
330 #ifdef HAVE_GETIFADDRS
331 	struct ifaddrs *ifap, *ifa;
332 	struct in6_ifreq ifr6;
333 	struct sockaddr_in6 *sin6;
334 	int s;
335 
336 	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
337 		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
338 		    strerror(errno));
339 		exit(1);
340 	}
341 	if (getifaddrs(&ifap) != 0) {
342 		warnmsg(LOG_ERR, __func__, "etifaddrs: %s",
343 		    strerror(errno));
344 		exit(1);
345 	}
346 
347 	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
348 		if (strlen(ifa->ifa_name) != strlen(name)
349 		 || strncmp(ifa->ifa_name, name, strlen(name)) != 0)
350 			continue;
351 		if (ifa->ifa_addr->sa_family != AF_INET6)
352 			continue;
353 		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
354 		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
355 			continue;
356 
357 		memset(&ifr6, 0, sizeof(ifr6));
358 		strcpy(ifr6.ifr_name, name);
359 		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
360 		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
361 			warnmsg(LOG_ERR, __func__,
362 			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
363 			exit(1);
364 		}
365 
366 		freeifaddrs(ifap);
367 		close(s);
368 		return ifr6.ifr_ifru.ifru_flags6;
369 	}
370 
371 	freeifaddrs(ifap);
372 	close(s);
373 	return -1;
374 #else
375 	int s;
376 	unsigned int maxif;
377 	struct ifreq *iflist;
378 	struct ifconf ifconf;
379 	struct ifreq *ifr, *ifr_end;
380 	struct sockaddr_in6 *sin6;
381 	struct in6_ifreq ifr6;
382 
383 	maxif = if_maxindex() + 1;
384 	iflist = (struct ifreq *)malloc(maxif * BUFSIZ);	/* XXX */
385 	if (iflist == NULL) {
386 		warnmsg(LOG_ERR, __func__, "not enough core");
387 		exit(1);
388 	}
389 
390 	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
391 		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
392 		    strerror(errno));
393 		exit(1);
394 	}
395 	memset(&ifconf, 0, sizeof(ifconf));
396 	ifconf.ifc_req = iflist;
397 	ifconf.ifc_len = maxif * BUFSIZ;	/* XXX */
398 	if (ioctl(s, SIOCGIFCONF, &ifconf) < 0) {
399 		warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFCONF): %s",
400 		    strerror(errno));
401 		exit(1);
402 	}
403 
404 	/* Look for this interface in the list */
405 	ifr_end = (struct ifreq *) (ifconf.ifc_buf + ifconf.ifc_len);
406 	for (ifr = ifconf.ifc_req;
407 	     ifr < ifr_end;
408 	     ifr = (struct ifreq *) ((char *) &ifr->ifr_addr
409 				    + ifr->ifr_addr.sa_len)) {
410 		if (strlen(ifr->ifr_name) != strlen(name)
411 		 || strncmp(ifr->ifr_name, name, strlen(name)) != 0)
412 			continue;
413 		if (ifr->ifr_addr.sa_family != AF_INET6)
414 			continue;
415 		sin6 = (struct sockaddr_in6 *)&ifr->ifr_addr;
416 		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
417 			continue;
418 
419 		memset(&ifr6, 0, sizeof(ifr6));
420 		strcpy(ifr6.ifr_name, name);
421 		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
422 		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
423 			warnmsg(LOG_ERR, __func__,
424 			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
425 			exit(1);
426 		}
427 
428 		free(iflist);
429 		close(s);
430 		return ifr6.ifr_ifru.ifru_flags6;
431 	}
432 
433 	free(iflist);
434 	close(s);
435 	return -1;
436 #endif
437 }
438 
439 #ifndef HAVE_GETIFADDRS
440 static unsigned int
441 if_maxindex(void)
442 {
443 	struct if_nameindex *p, *p0;
444 	unsigned int max = 0;
445 
446 	p0 = if_nameindex();
447 	for (p = p0; p && p->if_index && p->if_name; p++) {
448 		if (max < p->if_index)
449 			max = p->if_index;
450 	}
451 	if_freenameindex(p0);
452 	return max;
453 }
454 #endif
455 
456 static void
457 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
458 {
459 	int i;
460 
461 	for (i = 0; i < RTAX_MAX; i++) {
462 		if (addrs & (1 << i)) {
463 			rti_info[i] = sa;
464 			NEXT_SA(sa);
465 		}
466 		else
467 			rti_info[i] = NULL;
468 	}
469 }
470