if.c revision 124524 
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: head/usr.sbin/rtsold/if.c 124524 2004-01-14 17:16:19Z ume $
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
63extern int rssock;
64static int ifsock;
65
66static int get_llflag __P((const char *));
67static void get_rtaddrs __P((int, struct sockaddr *, struct sockaddr **));
68
69int
70ifinit(void)
71{
72	ifsock = rssock;
73
74	return(0);
75}
76
77int
78interface_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
123int
124interface_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
196int
197lladdropt_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
210void
211lladdropt_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
235struct sockaddr_dl *
236if_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		return(NULL);
282	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
283
284	free(buf);
285	return(ret_sdl);
286}
287
288int
289getinet6sysctl(int code)
290{
291	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
292	int value;
293	size_t size;
294
295	mib[3] = code;
296	size = sizeof(value);
297	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
298		return -1;
299	else
300		return value;
301}
302
303/*------------------------------------------------------------*/
304
305/* get ia6_flags for link-local addr on if.  returns -1 on error. */
306static int
307get_llflag(const char *name)
308{
309	struct ifaddrs *ifap, *ifa;
310	struct in6_ifreq ifr6;
311	struct sockaddr_in6 *sin6;
312	int s;
313
314	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
315		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
316		    strerror(errno));
317		exit(1);
318	}
319	if (getifaddrs(&ifap) != 0) {
320		warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
321		    strerror(errno));
322		exit(1);
323	}
324
325	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
326		if (strlen(ifa->ifa_name) != strlen(name) ||
327		    strncmp(ifa->ifa_name, name, strlen(name)) != 0)
328			continue;
329		if (ifa->ifa_addr->sa_family != AF_INET6)
330			continue;
331		sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
332		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
333			continue;
334
335		memset(&ifr6, 0, sizeof(ifr6));
336		strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
337		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
338		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
339			warnmsg(LOG_ERR, __func__,
340			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
341			exit(1);
342		}
343
344		freeifaddrs(ifap);
345		close(s);
346		return ifr6.ifr_ifru.ifru_flags6;
347	}
348
349	freeifaddrs(ifap);
350	close(s);
351	return -1;
352}
353
354
355static void
356get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
357{
358	int i;
359
360	for (i = 0; i < RTAX_MAX; i++) {
361		if (addrs & (1 << i)) {
362			rti_info[i] = sa;
363			NEXT_SA(sa);
364		} else
365			rti_info[i] = NULL;
366	}
367}
368