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 * $FreeBSD$
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	strlcpy(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	strlcpy(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	strlcpy(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	case IFT_IEEE80211:
251		return (ROUNDUP8(ETHER_ADDR_LEN + 2));
252	default:
253		return (0);
254	}
255}
256
257void
258lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
259{
260	char *addr;
261
262	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
263
264	switch (sdl->sdl_type) {
265	case IFT_ETHER:
266	case IFT_IEEE80211:
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
280struct sockaddr_dl *
281if_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
335int
336getinet6sysctl(int code)
337{
338	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
339	int value;
340	size_t size;
341
342	mib[3] = code;
343	size = sizeof(value);
344	if (sysctl(mib, nitems(mib), &value, &size, NULL, 0) < 0)
345		return (-1);
346	else
347		return (value);
348}
349
350int
351setinet6sysctl(int code, int newval)
352{
353	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
354	int value;
355	size_t size;
356
357	mib[3] = code;
358	size = sizeof(value);
359	if (sysctl(mib, nitems(mib), &value, &size,
360	    &newval, sizeof(newval)) < 0)
361		return (-1);
362	else
363		return (value);
364}
365
366/*------------------------------------------------------------*/
367
368/* get ia6_flags for link-local addr on if.  returns -1 on error. */
369static int
370get_llflag(const char *name)
371{
372	struct ifaddrs *ifap, *ifa;
373	struct in6_ifreq ifr6;
374	struct sockaddr_in6 *sin6;
375	int s;
376
377	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
378		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
379		    strerror(errno));
380		exit(1);
381	}
382	if (getifaddrs(&ifap) != 0) {
383		warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
384		    strerror(errno));
385		exit(1);
386	}
387
388	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
389		if (strlen(ifa->ifa_name) != strlen(name) ||
390		    strncmp(ifa->ifa_name, name, strlen(name)) != 0)
391			continue;
392		if (ifa->ifa_addr->sa_family != AF_INET6)
393			continue;
394		sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
395		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
396			continue;
397
398		memset(&ifr6, 0, sizeof(ifr6));
399		strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
400		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
401		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
402			warnmsg(LOG_ERR, __func__,
403			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
404			exit(1);
405		}
406
407		freeifaddrs(ifap);
408		close(s);
409		return (ifr6.ifr_ifru.ifru_flags6);
410	}
411
412	freeifaddrs(ifap);
413	close(s);
414	return (-1);
415}
416
417
418static void
419get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
420{
421	int i;
422
423	for (i = 0; i < RTAX_MAX; i++) {
424		if (addrs & (1 << i)) {
425			rti_info[i] = sa;
426			NEXT_SA(sa);
427		} else
428			rti_info[i] = NULL;
429	}
430}
431