if.c revision 281143 
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 281143 2015-04-06 09:42:23Z glebius $
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_types.h>
42#include <net/route.h>
43#include <net/if_dl.h>
44#include <net/if_media.h>
45#include <net/ethernet.h>
46#include <netinet/in.h>
47#include <netinet/icmp6.h>
48
49#include <netinet6/in6_var.h>
50#include <netinet6/nd6.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
63static int ifsock;
64
65static int get_llflag(const char *);
66static void get_rtaddrs(int, struct sockaddr *, struct sockaddr **);
67
68int
69ifinit(void)
70{
71	ifsock = rssock;
72
73	return(0);
74}
75
76int
77interface_up(char *name)
78{
79	struct ifreq ifr;
80	struct in6_ndireq nd;
81	int llflag;
82	int s;
83
84	memset(&ifr, 0, sizeof(ifr));
85	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
86	memset(&nd, 0, sizeof(nd));
87	strlcpy(nd.ifname, name, sizeof(nd.ifname));
88
89	if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
90		warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
91		    strerror(errno));
92		return (-1);
93	}
94	if (!(ifr.ifr_flags & IFF_UP)) {
95		ifr.ifr_flags |= IFF_UP;
96		if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
97			warnmsg(LOG_ERR, __func__,
98			    "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
99		return (-1);
100	}
101	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
102		warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s",
103		    strerror(errno));
104		return (-1);
105	}
106	if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
107		warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s",
108		    strerror(errno));
109		close(s);
110		return (-1);
111	}
112
113	warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
114
115	if (nd.ndi.flags & ND6_IFF_IFDISABLED) {
116		if (Fflag) {
117			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
118			if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
119				warnmsg(LOG_WARNING, __func__,
120				    "ioctl(SIOCSIFINFO_IN6): %s",
121		    		    strerror(errno));
122				close(s);
123				return (-1);
124			}
125		} else {
126			warnmsg(LOG_WARNING, __func__,
127			    "%s is disabled.", name);
128			close(s);
129			return (-1);
130		}
131	}
132	if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) {
133		if (Fflag) {
134			nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
135			if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
136				warnmsg(LOG_WARNING, __func__,
137				    "ioctl(SIOCSIFINFO_IN6): %s",
138		    		    strerror(errno));
139				close(s);
140				return (-1);
141			}
142		} else {
143			warnmsg(LOG_WARNING, __func__,
144			    "%s does not accept Router Advertisement.", name);
145			close(s);
146			return (-1);
147		}
148	}
149	close(s);
150
151	llflag = get_llflag(name);
152	if (llflag < 0) {
153		warnmsg(LOG_WARNING, __func__,
154		    "get_llflag() failed, anyway I'll try");
155		return (0);
156	}
157
158	if (!(llflag & IN6_IFF_NOTREADY)) {
159		warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
160		return (0);
161	} else {
162		if (llflag & IN6_IFF_TENTATIVE) {
163			warnmsg(LOG_DEBUG, __func__, "%s is tentative",
164			    name);
165			return (IFS_TENTATIVE);
166		}
167		if (llflag & IN6_IFF_DUPLICATED)
168			warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
169			    name);
170		return (-1);
171	}
172}
173
174int
175interface_status(struct ifinfo *ifinfo)
176{
177	char *ifname = ifinfo->ifname;
178	struct ifreq ifr;
179	struct ifmediareq ifmr;
180
181	/* get interface flags */
182	memset(&ifr, 0, sizeof(ifr));
183	strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
184	if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
185		warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
186		    ifname, strerror(errno));
187		return (-1);
188	}
189	/*
190	 * if one of UP and RUNNING flags is dropped,
191	 * the interface is not active.
192	 */
193	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
194		goto inactive;
195	/* Next, check carrier on the interface, if possible */
196	if (!ifinfo->mediareqok)
197		goto active;
198	memset(&ifmr, 0, sizeof(ifmr));
199	strncpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
200
201	if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
202		if (errno != EINVAL) {
203			warnmsg(LOG_DEBUG, __func__,
204			    "ioctl(SIOCGIFMEDIA) on %s: %s",
205			    ifname, strerror(errno));
206			return(-1);
207		}
208		/*
209		 * EINVAL simply means that the interface does not support
210		 * the SIOCGIFMEDIA ioctl. We regard it alive.
211		 */
212		ifinfo->mediareqok = 0;
213		goto active;
214	}
215
216	if (ifmr.ifm_status & IFM_AVALID) {
217		switch (ifmr.ifm_active & IFM_NMASK) {
218		case IFM_ETHER:
219		case IFM_IEEE80211:
220			if (ifmr.ifm_status & IFM_ACTIVE)
221				goto active;
222			else
223				goto inactive;
224			break;
225		default:
226			goto inactive;
227		}
228	}
229
230  inactive:
231	return (0);
232
233  active:
234	return (1);
235}
236
237#define ROUNDUP(a, size) \
238	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
239
240#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
241	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
242	sizeof(u_long)) : sizeof(u_long)))
243#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
244
245int
246lladdropt_length(struct sockaddr_dl *sdl)
247{
248	switch (sdl->sdl_type) {
249	case IFT_ETHER:
250#ifdef IFT_IEEE80211
251	case IFT_IEEE80211:
252#endif
253		return (ROUNDUP8(ETHER_ADDR_LEN + 2));
254	default:
255		return (0);
256	}
257}
258
259void
260lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
261{
262	char *addr;
263
264	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
265
266	switch (sdl->sdl_type) {
267	case IFT_ETHER:
268#ifdef IFT_IEEE80211
269	case IFT_IEEE80211:
270#endif
271		ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
272		addr = (char *)(ndopt + 1);
273		memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
274		break;
275	default:
276		warnmsg(LOG_ERR, __func__,
277		    "unsupported link type(%d)", sdl->sdl_type);
278		exit(1);
279	}
280
281	return;
282}
283
284struct sockaddr_dl *
285if_nametosdl(char *name)
286{
287	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
288	char *buf, *next, *lim;
289	size_t len;
290	struct if_msghdr *ifm;
291	struct sockaddr *sa, *rti_info[RTAX_MAX];
292	struct sockaddr_dl *sdl = NULL, *ret_sdl;
293
294	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
295		return(NULL);
296	if ((buf = malloc(len)) == NULL)
297		return(NULL);
298	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
299		free(buf);
300		return (NULL);
301	}
302
303	lim = buf + len;
304	for (next = buf; next < lim; next += ifm->ifm_msglen) {
305		ifm = (struct if_msghdr *)(void *)next;
306		if (ifm->ifm_type == RTM_IFINFO) {
307			sa = (struct sockaddr *)(ifm + 1);
308			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
309			if ((sa = rti_info[RTAX_IFP]) != NULL) {
310				if (sa->sa_family == AF_LINK) {
311					sdl = (struct sockaddr_dl *)(void *)sa;
312					if (strlen(name) != sdl->sdl_nlen)
313						continue; /* not same len */
314					if (strncmp(&sdl->sdl_data[0],
315						    name,
316						    sdl->sdl_nlen) == 0) {
317						break;
318					}
319				}
320			}
321		}
322	}
323	if (next == lim) {
324		/* search failed */
325		free(buf);
326		return (NULL);
327	}
328
329	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
330		free(buf);
331		return (NULL);
332	}
333	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
334
335	free(buf);
336	return (ret_sdl);
337}
338
339int
340getinet6sysctl(int code)
341{
342	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
343	int value;
344	size_t size;
345
346	mib[3] = code;
347	size = sizeof(value);
348	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
349		return (-1);
350	else
351		return (value);
352}
353
354int
355setinet6sysctl(int code, int newval)
356{
357	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
358	int value;
359	size_t size;
360
361	mib[3] = code;
362	size = sizeof(value);
363	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size,
364	    &newval, sizeof(newval)) < 0)
365		return (-1);
366	else
367		return (value);
368}
369
370/*------------------------------------------------------------*/
371
372/* get ia6_flags for link-local addr on if.  returns -1 on error. */
373static int
374get_llflag(const char *name)
375{
376	struct ifaddrs *ifap, *ifa;
377	struct in6_ifreq ifr6;
378	struct sockaddr_in6 *sin6;
379	int s;
380
381	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
382		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
383		    strerror(errno));
384		exit(1);
385	}
386	if (getifaddrs(&ifap) != 0) {
387		warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
388		    strerror(errno));
389		exit(1);
390	}
391
392	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
393		if (strlen(ifa->ifa_name) != strlen(name) ||
394		    strncmp(ifa->ifa_name, name, strlen(name)) != 0)
395			continue;
396		if (ifa->ifa_addr->sa_family != AF_INET6)
397			continue;
398		sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
399		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
400			continue;
401
402		memset(&ifr6, 0, sizeof(ifr6));
403		strncpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
404		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
405		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
406			warnmsg(LOG_ERR, __func__,
407			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
408			exit(1);
409		}
410
411		freeifaddrs(ifap);
412		close(s);
413		return (ifr6.ifr_ifru.ifru_flags6);
414	}
415
416	freeifaddrs(ifap);
417	close(s);
418	return (-1);
419}
420
421
422static void
423get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
424{
425	int i;
426
427	for (i = 0; i < RTAX_MAX; i++) {
428		if (addrs & (1 << i)) {
429			rti_info[i] = sa;
430			NEXT_SA(sa);
431		} else
432			rti_info[i] = NULL;
433	}
434}
435