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_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#include <netinet6/nd6.h>
52
53#include <stdio.h>
54#include <unistd.h>
55#include <stdlib.h>
56#include <syslog.h>
57#include <string.h>
58#include <fcntl.h>
59#include <errno.h>
60#include <limits.h>
61#include <ifaddrs.h>
62#include "rtsold.h"
63
64static int ifsock;
65
66static int get_llflag(const char *);
67static void get_rtaddrs(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	struct in6_ndireq nd;
82	int llflag;
83	int s;
84
85	memset(&ifr, 0, sizeof(ifr));
86	strlcpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
87	memset(&nd, 0, sizeof(nd));
88	strlcpy(nd.ifname, name, sizeof(nd.ifname));
89
90	if (ioctl(ifsock, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) {
91		warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFFLAGS): %s",
92		    strerror(errno));
93		return (-1);
94	}
95	if (!(ifr.ifr_flags & IFF_UP)) {
96		ifr.ifr_flags |= IFF_UP;
97		if (ioctl(ifsock, SIOCSIFFLAGS, (caddr_t)&ifr) < 0)
98			warnmsg(LOG_ERR, __func__,
99			    "ioctl(SIOCSIFFLAGS): %s", strerror(errno));
100		return (-1);
101	}
102	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
103		warnmsg(LOG_WARNING, __func__, "socket(AF_INET6, SOCK_DGRAM): %s",
104		    strerror(errno));
105		return (-1);
106	}
107	if (ioctl(s, SIOCGIFINFO_IN6, (caddr_t)&nd) < 0) {
108		warnmsg(LOG_WARNING, __func__, "ioctl(SIOCGIFINFO_IN6): %s",
109		    strerror(errno));
110		close(s);
111		return (-1);
112	}
113
114	warnmsg(LOG_DEBUG, __func__, "checking if %s is ready...", name);
115
116	if (nd.ndi.flags & ND6_IFF_IFDISABLED) {
117		if (Fflag) {
118			nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
119			if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
120				warnmsg(LOG_WARNING, __func__,
121				    "ioctl(SIOCSIFINFO_IN6): %s",
122		    		    strerror(errno));
123				close(s);
124				return (-1);
125			}
126		} else {
127			warnmsg(LOG_WARNING, __func__,
128			    "%s is disabled.", name);
129			close(s);
130			return (-1);
131		}
132	}
133	if (!(nd.ndi.flags & ND6_IFF_ACCEPT_RTADV)) {
134		if (Fflag) {
135			nd.ndi.flags |= ND6_IFF_ACCEPT_RTADV;
136			if (ioctl(s, SIOCSIFINFO_IN6, (caddr_t)&nd)) {
137				warnmsg(LOG_WARNING, __func__,
138				    "ioctl(SIOCSIFINFO_IN6): %s",
139		    		    strerror(errno));
140				close(s);
141				return (-1);
142			}
143		} else {
144			warnmsg(LOG_WARNING, __func__,
145			    "%s does not accept Router Advertisement.", name);
146			close(s);
147			return (-1);
148		}
149	}
150	close(s);
151
152	llflag = get_llflag(name);
153	if (llflag < 0) {
154		warnmsg(LOG_WARNING, __func__,
155		    "get_llflag() failed, anyway I'll try");
156		return (0);
157	}
158
159	if (!(llflag & IN6_IFF_NOTREADY)) {
160		warnmsg(LOG_DEBUG, __func__, "%s is ready", name);
161		return (0);
162	} else {
163		if (llflag & IN6_IFF_TENTATIVE) {
164			warnmsg(LOG_DEBUG, __func__, "%s is tentative",
165			    name);
166			return (IFS_TENTATIVE);
167		}
168		if (llflag & IN6_IFF_DUPLICATED)
169			warnmsg(LOG_DEBUG, __func__, "%s is duplicated",
170			    name);
171		return (-1);
172	}
173}
174
175int
176interface_status(struct ifinfo *ifinfo)
177{
178	char *ifname = ifinfo->ifname;
179	struct ifreq ifr;
180	struct ifmediareq ifmr;
181
182	/* get interface flags */
183	memset(&ifr, 0, sizeof(ifr));
184	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
185	if (ioctl(ifsock, SIOCGIFFLAGS, &ifr) < 0) {
186		warnmsg(LOG_ERR, __func__, "ioctl(SIOCGIFFLAGS) on %s: %s",
187		    ifname, strerror(errno));
188		return (-1);
189	}
190	/*
191	 * if one of UP and RUNNING flags is dropped,
192	 * the interface is not active.
193	 */
194	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
195		goto inactive;
196	/* Next, check carrier on the interface, if possible */
197	if (!ifinfo->mediareqok)
198		goto active;
199	memset(&ifmr, 0, sizeof(ifmr));
200	strlcpy(ifmr.ifm_name, ifname, sizeof(ifmr.ifm_name));
201
202	if (ioctl(ifsock, SIOCGIFMEDIA, (caddr_t)&ifmr) < 0) {
203		if (errno != EINVAL) {
204			warnmsg(LOG_DEBUG, __func__,
205			    "ioctl(SIOCGIFMEDIA) on %s: %s",
206			    ifname, strerror(errno));
207			return(-1);
208		}
209		/*
210		 * EINVAL simply means that the interface does not support
211		 * the SIOCGIFMEDIA ioctl. We regard it alive.
212		 */
213		ifinfo->mediareqok = 0;
214		goto active;
215	}
216
217	if (ifmr.ifm_status & IFM_AVALID) {
218		switch (ifmr.ifm_active & IFM_NMASK) {
219		case IFM_ETHER:
220		case IFM_IEEE80211:
221			if (ifmr.ifm_status & IFM_ACTIVE)
222				goto active;
223			else
224				goto inactive;
225			break;
226		default:
227			goto inactive;
228		}
229	}
230
231  inactive:
232	return (0);
233
234  active:
235	return (1);
236}
237
238#define ROUNDUP(a, size) \
239	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
240
241#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
242	((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\
243	sizeof(u_long)) : sizeof(u_long)))
244#define ROUNDUP8(a) (1 + (((a) - 1) | 7))
245
246int
247lladdropt_length(struct sockaddr_dl *sdl)
248{
249	switch (sdl->sdl_type) {
250	case IFT_ETHER:
251#ifdef IFT_IEEE80211
252	case IFT_IEEE80211:
253#endif
254		return (ROUNDUP8(ETHER_ADDR_LEN + 2));
255	default:
256		return (0);
257	}
258}
259
260void
261lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt)
262{
263	char *addr;
264
265	ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */
266
267	switch (sdl->sdl_type) {
268	case IFT_ETHER:
269#ifdef IFT_IEEE80211
270	case IFT_IEEE80211:
271#endif
272		ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3;
273		addr = (char *)(ndopt + 1);
274		memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN);
275		break;
276	default:
277		warnmsg(LOG_ERR, __func__,
278		    "unsupported link type(%d)", sdl->sdl_type);
279		exit(1);
280	}
281
282	return;
283}
284
285struct sockaddr_dl *
286if_nametosdl(char *name)
287{
288	int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0};
289	char *buf, *next, *lim;
290	size_t len;
291	struct if_msghdr *ifm;
292	struct sockaddr *sa, *rti_info[RTAX_MAX];
293	struct sockaddr_dl *sdl = NULL, *ret_sdl;
294
295	if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
296		return(NULL);
297	if ((buf = malloc(len)) == NULL)
298		return(NULL);
299	if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
300		free(buf);
301		return (NULL);
302	}
303
304	lim = buf + len;
305	for (next = buf; next < lim; next += ifm->ifm_msglen) {
306		ifm = (struct if_msghdr *)(void *)next;
307		if (ifm->ifm_type == RTM_IFINFO) {
308			sa = (struct sockaddr *)(ifm + 1);
309			get_rtaddrs(ifm->ifm_addrs, sa, rti_info);
310			if ((sa = rti_info[RTAX_IFP]) != NULL) {
311				if (sa->sa_family == AF_LINK) {
312					sdl = (struct sockaddr_dl *)(void *)sa;
313					if (strlen(name) != sdl->sdl_nlen)
314						continue; /* not same len */
315					if (strncmp(&sdl->sdl_data[0],
316						    name,
317						    sdl->sdl_nlen) == 0) {
318						break;
319					}
320				}
321			}
322		}
323	}
324	if (next == lim) {
325		/* search failed */
326		free(buf);
327		return (NULL);
328	}
329
330	if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) {
331		free(buf);
332		return (NULL);
333	}
334	memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len);
335
336	free(buf);
337	return (ret_sdl);
338}
339
340int
341getinet6sysctl(int code)
342{
343	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
344	int value;
345	size_t size;
346
347	mib[3] = code;
348	size = sizeof(value);
349	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size, NULL, 0) < 0)
350		return (-1);
351	else
352		return (value);
353}
354
355int
356setinet6sysctl(int code, int newval)
357{
358	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
359	int value;
360	size_t size;
361
362	mib[3] = code;
363	size = sizeof(value);
364	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &value, &size,
365	    &newval, sizeof(newval)) < 0)
366		return (-1);
367	else
368		return (value);
369}
370
371/*------------------------------------------------------------*/
372
373/* get ia6_flags for link-local addr on if.  returns -1 on error. */
374static int
375get_llflag(const char *name)
376{
377	struct ifaddrs *ifap, *ifa;
378	struct in6_ifreq ifr6;
379	struct sockaddr_in6 *sin6;
380	int s;
381
382	if ((s = socket(PF_INET6, SOCK_DGRAM, 0)) < 0) {
383		warnmsg(LOG_ERR, __func__, "socket(SOCK_DGRAM): %s",
384		    strerror(errno));
385		exit(1);
386	}
387	if (getifaddrs(&ifap) != 0) {
388		warnmsg(LOG_ERR, __func__, "getifaddrs: %s",
389		    strerror(errno));
390		exit(1);
391	}
392
393	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
394		if (strlen(ifa->ifa_name) != strlen(name) ||
395		    strncmp(ifa->ifa_name, name, strlen(name)) != 0)
396			continue;
397		if (ifa->ifa_addr->sa_family != AF_INET6)
398			continue;
399		sin6 = (struct sockaddr_in6 *)(void *)ifa->ifa_addr;
400		if (!IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
401			continue;
402
403		memset(&ifr6, 0, sizeof(ifr6));
404		strlcpy(ifr6.ifr_name, name, sizeof(ifr6.ifr_name));
405		memcpy(&ifr6.ifr_ifru.ifru_addr, sin6, sin6->sin6_len);
406		if (ioctl(s, SIOCGIFAFLAG_IN6, &ifr6) < 0) {
407			warnmsg(LOG_ERR, __func__,
408			    "ioctl(SIOCGIFAFLAG_IN6): %s", strerror(errno));
409			exit(1);
410		}
411
412		freeifaddrs(ifap);
413		close(s);
414		return (ifr6.ifr_ifru.ifru_flags6);
415	}
416
417	freeifaddrs(ifap);
418	close(s);
419	return (-1);
420}
421
422
423static void
424get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
425{
426	int i;
427
428	for (i = 0; i < RTAX_MAX; i++) {
429		if (addrs & (1 << i)) {
430			rti_info[i] = sa;
431			NEXT_SA(sa);
432		} else
433			rti_info[i] = NULL;
434	}
435}
436