GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/route6d/route6d.c Lines: 0 1526 0.0 %
Date: 2017-11-13 Branches: 0 1194 0.0 %

Line Branch Exec Source
1
/*	$OpenBSD: route6d.c,v 1.92 2017/08/23 11:25:07 jca Exp $	*/
2
/*	$KAME: route6d.c,v 1.111 2006/10/25 06:38:13 jinmei Exp $	*/
3
4
/*
5
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6
 * All rights reserved.
7
 *
8
 * Redistribution and use in source and binary forms, with or without
9
 * modification, are permitted provided that the following conditions
10
 * are met:
11
 * 1. Redistributions of source code must retain the above copyright
12
 *    notice, this list of conditions and the following disclaimer.
13
 * 2. Redistributions in binary form must reproduce the above copyright
14
 *    notice, this list of conditions and the following disclaimer in the
15
 *    documentation and/or other materials provided with the distribution.
16
 * 3. Neither the name of the project nor the names of its contributors
17
 *    may be used to endorse or promote products derived from this software
18
 *    without specific prior written permission.
19
 *
20
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30
 * SUCH DAMAGE.
31
 */
32
33
#include <sys/types.h>
34
#include <sys/ioctl.h>
35
#include <sys/socket.h>
36
#include <sys/sysctl.h>
37
#include <sys/uio.h>
38
39
#include <net/if.h>
40
#include <net/route.h>
41
#include <netinet/in.h>
42
#include <netinet/ip6.h>
43
#include <netinet/udp.h>
44
#include <netinet6/in6_var.h>
45
46
#include <arpa/inet.h>
47
#include <errno.h>
48
#include <ifaddrs.h>
49
#include <netdb.h>
50
#include <poll.h>
51
#include <signal.h>
52
#include <stdarg.h>
53
#include <stddef.h>
54
#include <stdint.h>
55
#include <stdio.h>
56
#include <stdlib.h>
57
#include <string.h>
58
#include <time.h>
59
#include <unistd.h>
60
61
#include "route6d.h"
62
#include "log.h"
63
64
#define	MAXFILTER	40
65
66
#ifdef	DEBUG
67
#define	INIT_INTERVAL6	6
68
#else
69
#define	INIT_INTERVAL6	10	/* Wait to submit a initial riprequest */
70
#endif
71
72
/* alignment constraint for routing socket */
73
#define ROUNDUP(a) \
74
	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
75
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
76
77
/*
78
 * Following two macros are highly depending on KAME Release
79
 */
80
#define	IN6_LINKLOCAL_IFINDEX(addr) \
81
	((addr).s6_addr[2] << 8 | (addr).s6_addr[3])
82
83
#define	SET_IN6_LINKLOCAL_IFINDEX(addr, index) \
84
	do { \
85
		(addr).s6_addr[2] = ((index) >> 8) & 0xff; \
86
		(addr).s6_addr[3] = (index) & 0xff; \
87
	} while (0)
88
89
struct	ifc {			/* Configuration of an interface */
90
	char	*ifc_name;			/* if name */
91
	struct	ifc *ifc_next;
92
	int	ifc_index;			/* if index */
93
	int	ifc_mtu;			/* if mtu */
94
	int	ifc_metric;			/* if metric */
95
	u_int	ifc_flags;			/* flags */
96
	short	ifc_cflags;			/* IFC_XXX */
97
	struct	in6_addr ifc_mylladdr;		/* my link-local address */
98
	struct	sockaddr_in6 ifc_ripsin;	/* rip multicast address */
99
	struct	iff *ifc_filter;		/* filter structure */
100
	struct	ifac *ifc_addr;			/* list of AF_INET6 addresses */
101
	int	ifc_joined;			/* joined to ff02::9 */
102
};
103
104
struct	ifac {			/* Address associated to an interface */
105
	struct	ifc *ifa_conf;		/* back pointer */
106
	struct	ifac *ifa_next;
107
	struct	in6_addr ifa_addr;	/* address */
108
	struct	in6_addr ifa_raddr;	/* remote address, valid in p2p */
109
	int	ifa_plen;		/* prefix length */
110
};
111
112
struct	iff {
113
	int	iff_type;
114
	struct	in6_addr iff_addr;
115
	int	iff_plen;
116
	struct	iff *iff_next;
117
};
118
119
struct	ifc *ifc;
120
int	nifc;		/* number of valid ifc's */
121
struct	ifc **index2ifc;
122
int	nindex2ifc;
123
struct	ifc *loopifcp = NULL;	/* pointing to loopback */
124
struct	pollfd pfd[2];
125
int	rtsock;		/* the routing socket */
126
int	ripsock;	/* socket to send/receive RIP datagram */
127
128
struct	rip6 *ripbuf;	/* packet buffer for sending */
129
130
/*
131
 * Maintain the routes in a linked list.  When the number of the routes
132
 * grows, somebody would like to introduce a hash based or a radix tree
133
 * based structure.  I believe the number of routes handled by RIP is
134
 * limited and I don't have to manage a complex data structure, however.
135
 *
136
 * One of the major drawbacks of the linear linked list is the difficulty
137
 * of representing the relationship between a couple of routes.  This may
138
 * be a significant problem when we have to support route aggregation with
139
 * suppressing the specifics covered by the aggregate.
140
 */
141
142
struct	riprt {
143
	struct	riprt *rrt_next;	/* next destination */
144
	struct	netinfo6 rrt_info;	/* network info */
145
	struct	in6_addr rrt_gw;	/* gateway */
146
	u_long	rrt_flags;		/* kernel routing table flags */
147
	u_long	rrt_rflags;		/* route6d routing table flags */
148
	time_t	rrt_t;			/* when the route validated */
149
	int	rrt_index;		/* ifindex from which this route got */
150
};
151
152
struct	riprt *riprt = 0;
153
154
int	dflag = 0;	/* debug flag */
155
int	qflag = 0;	/* quiet flag */
156
int	nflag = 0;	/* don't update kernel routing table */
157
int	aflag = 0;	/* age out even the statically defined routes */
158
int	hflag = 0;	/* don't split horizon */
159
int	lflag = 0;	/* exchange site local routes */
160
int	sflag = 0;	/* announce static routes w/ split horizon */
161
int	Sflag = 0;	/* announce static routes to every interface */
162
int	uflag = 0;	/* always log route updates (additions/deletions) */
163
unsigned long routetag = 0;	/* route tag attached on originating case */
164
165
char	*filter[MAXFILTER];
166
int	filtertype[MAXFILTER];
167
int	nfilter = 0;
168
169
pid_t	pid;
170
171
struct	sockaddr_storage ripsin;
172
173
time_t	nextalarm = 0;
174
time_t	sup_trig_update = 0;
175
176
static	int	seq = 0;
177
178
volatile sig_atomic_t seenalrm;
179
volatile sig_atomic_t seenquit;
180
volatile sig_atomic_t seenusr1;
181
182
#define	RRTF_AGGREGATE		0x08000000
183
#define	RRTF_NOADVERTISE	0x10000000
184
#define	RRTF_NH_NOT_LLADDR	0x20000000
185
#define RRTF_SENDANYWAY		0x40000000
186
#define	RRTF_CHANGED		0x80000000
187
188
void sighandler(int);
189
void ripalarm(void);
190
void riprecv(void);
191
void ripsend(struct ifc *, struct sockaddr_in6 *, int);
192
int out_filter(struct riprt *, struct ifc *);
193
void init(void);
194
void sockopt(struct ifc *);
195
void ifconfig(void);
196
void ifconfig1(const char *, const struct sockaddr *, struct ifc *, int);
197
void rtrecv(void);
198
int rt_del(const struct sockaddr_in6 *, const struct sockaddr_in6 *,
199
    const struct sockaddr_in6 *);
200
int rt_deladdr(struct ifc *, const struct sockaddr_in6 *,
201
    const struct sockaddr_in6 *);
202
void filterconfig(void);
203
int getifmtu(int);
204
const char *rttypes(struct rt_msghdr *);
205
const char *rtflags(struct rt_msghdr *);
206
const char *ifflags(int);
207
int ifrt(struct ifc *, int);
208
void ifrt_p2p(struct ifc *, int);
209
void applyplen(struct in6_addr *, int);
210
void ifrtdump(int);
211
void ifdump(int);
212
void ifdump0(const struct ifc *);
213
void rtdump(int);
214
void rt_entry(struct rt_msghdr *, int);
215
__dead void rtdexit(void);
216
void riprequest(struct ifc *, struct netinfo6 *, int, struct sockaddr_in6 *);
217
void ripflush(struct ifc *, struct sockaddr_in6 *);
218
void sendrequest(struct ifc *);
219
int sin6mask2len(const struct sockaddr_in6 *);
220
int mask2len(const struct in6_addr *, int);
221
int sendpacket(struct sockaddr_in6 *, int);
222
int addroute(struct riprt *, const struct in6_addr *, struct ifc *);
223
int delroute(struct netinfo6 *, struct in6_addr *);
224
struct in6_addr *getroute(struct netinfo6 *, struct in6_addr *);
225
void krtread(int);
226
int tobeadv(struct riprt *, struct ifc *);
227
char *xstrdup(const char *);
228
const char *hms(void);
229
const char *inet6_n2p(const struct in6_addr *);
230
struct ifac *ifa_match(const struct ifc *, const struct in6_addr *, int);
231
struct in6_addr *plen2mask(int);
232
struct riprt *rtsearch(struct netinfo6 *, struct riprt **);
233
int ripinterval(int);
234
time_t ripsuptrig(void);
235
unsigned int if_maxindex(void);
236
struct ifc *ifc_find(char *);
237
struct iff *iff_find(struct ifc *, int);
238
void setindex2ifc(int, struct ifc *);
239
240
int
241
main(int argc, char *argv[])
242
{
243
	int	ch;
244
	int	error = 0;
245
	struct	ifc *ifcp;
246
	sigset_t mask, omask;
247
	char *ep;
248
249
	log_init(1); /* log to stderr until daemonized */
250
251
	while ((ch = getopt(argc, argv, "A:N:O:T:L:t:adDhlnqsSu")) != -1) {
252
		switch (ch) {
253
		case 'A':
254
		case 'N':
255
		case 'O':
256
		case 'T':
257
		case 'L':
258
			if (nfilter >= MAXFILTER) {
259
				fatalx("Exceeds MAXFILTER");
260
				/*NOTREACHED*/
261
			}
262
			filtertype[nfilter] = ch;
263
			filter[nfilter++] = xstrdup(optarg);
264
			break;
265
		case 't':
266
			ep = NULL;
267
			routetag = strtoul(optarg, &ep, 0);
268
			if (!ep || *ep != '\0' || (routetag & ~0xffff) != 0) {
269
				fatalx("invalid route tag");
270
				/*NOTREACHED*/
271
			}
272
			break;
273
#define	FLAG(c, flag, n)	case c: do { flag = n; break; } while(0)
274
		FLAG('a', aflag, 1); break;
275
		FLAG('d', dflag, 1); break;
276
		FLAG('D', dflag, 2); break;
277
		FLAG('h', hflag, 1); break;
278
		FLAG('l', lflag, 1); break;
279
		FLAG('n', nflag, 1); break;
280
		FLAG('q', qflag, 1); break;
281
		FLAG('s', sflag, 1); break;
282
		FLAG('S', Sflag, 1); break;
283
		FLAG('u', uflag, 1); break;
284
#undef	FLAG
285
		default:
286
			fatalx("Invalid option specified, terminating");
287
			/*NOTREACHED*/
288
		}
289
	}
290
	argc -= optind;
291
	argv += optind;
292
	if (argc > 0) {
293
		fatalx("bogus extra arguments");
294
		/*NOTREACHED*/
295
	}
296
297
	if (geteuid()) {
298
		nflag = 1;
299
		log_warn("No kernel update is allowed");
300
	}
301
302
	if (dflag == 0) {
303
		if (daemon(0, 0) < 0) {
304
			fatal("daemon");
305
			/*NOTREACHED*/
306
		}
307
	}
308
309
	log_init(dflag);
310
311
	pid = getpid();
312
313
	if ((ripbuf = calloc(RIP6_MAXMTU, 1)) == NULL)
314
		fatal(NULL);
315
	ripbuf->rip6_cmd = RIP6_RESPONSE;
316
	ripbuf->rip6_vers = RIP6_VERSION;
317
	ripbuf->rip6_res1[0] = 0;
318
	ripbuf->rip6_res1[1] = 0;
319
320
	init();
321
322
	if (pledge("stdio inet route mcast flock rpath cpath wpath", NULL) == -1)
323
		fatal("pledge");
324
325
	ifconfig();
326
327
	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
328
		if (ifcp->ifc_index < 0) {
329
			log_warn(
330
"No ifindex found at %s (no link-local address?)",
331
				ifcp->ifc_name);
332
			error++;
333
		}
334
	}
335
	if (error)
336
		exit(1);
337
	if (loopifcp == NULL) {
338
		fatalx("No loopback found");
339
		/*NOTREACHED*/
340
	}
341
	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
342
		ifrt(ifcp, 0);
343
	filterconfig();
344
	krtread(0);
345
	if (dflag)
346
		ifrtdump(0);
347
348
	if (signal(SIGALRM, sighandler) == SIG_ERR ||
349
	    signal(SIGQUIT, sighandler) == SIG_ERR ||
350
	    signal(SIGTERM, sighandler) == SIG_ERR ||
351
	    signal(SIGUSR1, sighandler) == SIG_ERR ||
352
	    signal(SIGHUP, sighandler) == SIG_ERR ||
353
	    signal(SIGINT, sighandler) == SIG_ERR) {
354
		fatal("signal");
355
		/*NOTREACHED*/
356
	}
357
	/*
358
	 * To avoid rip packet congestion (not on a cable but in this
359
	 * process), wait for a moment to send the first RIP6_RESPONSE
360
	 * packets.
361
	 */
362
	alarm(ripinterval(INIT_INTERVAL6));
363
364
	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
365
		if (iff_find(ifcp, 'N'))
366
			continue;
367
		if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
368
			sendrequest(ifcp);
369
	}
370
371
	log_info("**** Started ****");
372
	sigemptyset(&mask);
373
	sigaddset(&mask, SIGALRM);
374
	while (1) {
375
		if (seenalrm) {
376
			ripalarm();
377
			seenalrm = 0;
378
			continue;
379
		}
380
		if (seenquit) {
381
			rtdexit();
382
			seenquit = 0;
383
			continue;
384
		}
385
		if (seenusr1) {
386
			ifrtdump(SIGUSR1);
387
			seenusr1 = 0;
388
			continue;
389
		}
390
391
		switch (poll(pfd, 2, INFTIM))
392
		{
393
		case -1:
394
			if (errno != EINTR) {
395
				fatal("poll");
396
				/*NOTREACHED*/
397
			}
398
			continue;
399
		case 0:
400
			continue;
401
		default:
402
			if (pfd[0].revents & POLLIN) {
403
				sigprocmask(SIG_BLOCK, &mask, &omask);
404
				riprecv();
405
				sigprocmask(SIG_SETMASK, &omask, NULL);
406
			}
407
			if (pfd[1].revents & POLLIN) {
408
				sigprocmask(SIG_BLOCK, &mask, &omask);
409
				rtrecv();
410
				sigprocmask(SIG_SETMASK, &omask, NULL);
411
			}
412
		}
413
	}
414
}
415
416
void
417
sighandler(int signo)
418
{
419
420
	switch (signo) {
421
	case SIGALRM:
422
		seenalrm++;
423
		break;
424
	case SIGQUIT:
425
	case SIGTERM:
426
		seenquit++;
427
		break;
428
	case SIGUSR1:
429
	case SIGHUP:
430
	case SIGINT:
431
		seenusr1++;
432
		break;
433
	}
434
}
435
436
/*
437
 * gracefully exits after resetting sockopts.
438
 */
439
void
440
rtdexit(void)
441
{
442
	struct	riprt *rrt;
443
444
	alarm(0);
445
	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
446
		if (rrt->rrt_rflags & RRTF_AGGREGATE) {
447
			delroute(&rrt->rrt_info, &rrt->rrt_gw);
448
		}
449
	}
450
	close(ripsock);
451
	close(rtsock);
452
	log_info("**** Terminated ****");
453
	exit(1);
454
}
455
456
/*
457
 * Called periodically:
458
 *	1. age out the learned route. remove it if necessary.
459
 *	2. submit RIP6_RESPONSE packets.
460
 * Invoked in every SUPPLY_INTERVAL6 (30) seconds.  I believe we don't have
461
 * to invoke this function in every 1 or 5 or 10 seconds only to age the
462
 * routes more precisely.
463
 */
464
void
465
ripalarm(void)
466
{
467
	struct	ifc *ifcp;
468
	struct	riprt *rrt, *rrt_prev, *rrt_next;
469
	time_t	t_lifetime, t_holddown;
470
471
	/* age the RIP routes */
472
	rrt_prev = 0;
473
	t_lifetime = time(NULL) - RIP_LIFETIME;
474
	t_holddown = t_lifetime - RIP_HOLDDOWN;
475
	for (rrt = riprt; rrt; rrt = rrt_next) {
476
		rrt_next = rrt->rrt_next;
477
478
		if (rrt->rrt_t == 0) {
479
			rrt_prev = rrt;
480
			continue;
481
		}
482
		if (rrt->rrt_t < t_holddown) {
483
			if (rrt_prev) {
484
				rrt_prev->rrt_next = rrt->rrt_next;
485
			} else {
486
				riprt = rrt->rrt_next;
487
			}
488
			delroute(&rrt->rrt_info, &rrt->rrt_gw);
489
			free(rrt);
490
			continue;
491
		}
492
		if (rrt->rrt_t < t_lifetime)
493
			rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
494
		rrt_prev = rrt;
495
	}
496
	/* Supply updates */
497
	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
498
		if (ifcp->ifc_index > 0 && (ifcp->ifc_flags & IFF_UP))
499
			ripsend(ifcp, &ifcp->ifc_ripsin, 0);
500
	}
501
	alarm(ripinterval(SUPPLY_INTERVAL6));
502
}
503
504
void
505
init(void)
506
{
507
	int	i, error;
508
	const int int0 = 0, int1 = 1, int255 = 255;
509
	struct	addrinfo hints, *res;
510
	char	port[NI_MAXSERV];
511
512
	ifc = (struct ifc *)NULL;
513
	nifc = 0;
514
	nindex2ifc = 0;	/*initial guess*/
515
	index2ifc = NULL;
516
	snprintf(port, sizeof(port), "%u", RIP6_PORT);
517
518
	memset(&hints, 0, sizeof(hints));
519
	hints.ai_family = PF_INET6;
520
	hints.ai_socktype = SOCK_DGRAM;
521
	hints.ai_flags = AI_PASSIVE;
522
	error = getaddrinfo(NULL, port, &hints, &res);
523
	if (error) {
524
		fatalx(gai_strerror(error));
525
		/*NOTREACHED*/
526
	}
527
	if (res->ai_next) {
528
		fatalx(":: resolved to multiple address");
529
		/*NOTREACHED*/
530
	}
531
532
	ripsock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
533
	if (ripsock < 0) {
534
		fatal("rip socket");
535
		/*NOTREACHED*/
536
	}
537
	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_V6ONLY,
538
	    &int1, sizeof(int1)) < 0) {
539
		fatal("rip IPV6_V6ONLY");
540
		/*NOTREACHED*/
541
	}
542
	if (bind(ripsock, res->ai_addr, res->ai_addrlen) < 0) {
543
		fatal("rip bind");
544
		/*NOTREACHED*/
545
	}
546
	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_HOPS,
547
	    &int255, sizeof(int255)) < 0) {
548
		fatal("rip IPV6_MULTICAST_HOPS");
549
		/*NOTREACHED*/
550
	}
551
	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
552
	    &int0, sizeof(int0)) < 0) {
553
		fatal("rip IPV6_MULTICAST_LOOP");
554
		/*NOTREACHED*/
555
	}
556
557
	i = 1;
558
	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &i,
559
	    sizeof(i)) < 0) {
560
		fatal("rip IPV6_RECVPKTINFO");
561
		/*NOTREACHED*/
562
	}
563
564
	if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT,
565
	    &int1, sizeof(int1)) < 0) {
566
		fatal("rip IPV6_RECVHOPLIMIT");
567
		/*NOTREACHED*/
568
	}
569
570
	memset(&hints, 0, sizeof(hints));
571
	hints.ai_family = PF_INET6;
572
	hints.ai_socktype = SOCK_DGRAM;
573
	error = getaddrinfo(RIP6_DEST, port, &hints, &res);
574
	if (error) {
575
		fatalx(gai_strerror(error));
576
		/*NOTREACHED*/
577
	}
578
	if (res->ai_next) {
579
		fatalx(RIP6_DEST " resolved to multiple address");
580
		/*NOTREACHED*/
581
	}
582
	memcpy(&ripsin, res->ai_addr, res->ai_addrlen);
583
584
	pfd[0].fd = ripsock;
585
	pfd[0].events = POLLIN;
586
587
	if (nflag == 0) {
588
		if ((rtsock = socket(PF_ROUTE, SOCK_RAW, 0)) < 0) {
589
			fatal("route socket");
590
			/*NOTREACHED*/
591
		}
592
		pfd[1].fd = rtsock;
593
		pfd[1].events = POLLIN;
594
	} else
595
		pfd[1].fd = -1;
596
597
}
598
599
#define	RIPSIZE(n) \
600
	(sizeof(struct rip6) + ((n)-1) * sizeof(struct netinfo6))
601
602
/*
603
 * ripflush flushes the rip datagram stored in the rip buffer
604
 */
605
static int nrt;
606
static struct netinfo6 *np;
607
608
void
609
ripflush(struct ifc *ifcp, struct sockaddr_in6 *sin6)
610
{
611
	int i;
612
	int error;
613
614
	if (ifcp)
615
		log_debug("Send(%s): info(%d) to %s.%d",
616
			ifcp->ifc_name, nrt,
617
			inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
618
	else
619
		log_debug("Send: info(%d) to %s.%d",
620
			nrt, inet6_n2p(&sin6->sin6_addr), ntohs(sin6->sin6_port));
621
	if (dflag >= 2) {
622
		np = ripbuf->rip6_nets;
623
		for (i = 0; i < nrt; i++, np++) {
624
			if (np->rip6_metric == NEXTHOP_METRIC) {
625
				if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest))
626
					log_enqueue("    NextHop reset");
627
				else {
628
					log_enqueue("    NextHop %s",
629
						inet6_n2p(&np->rip6_dest));
630
				}
631
			} else {
632
				log_enqueue("    %s/%d[%d]",
633
					inet6_n2p(&np->rip6_dest),
634
					np->rip6_plen, np->rip6_metric);
635
			}
636
			if (np->rip6_tag) {
637
				log_enqueue("  tag=0x%04x",
638
					ntohs(np->rip6_tag) & 0xffff);
639
			}
640
			log_debug("");
641
		}
642
	}
643
	error = sendpacket(sin6, RIPSIZE(nrt));
644
	if (error == EAFNOSUPPORT) {
645
		/* Protocol not supported */
646
		log_debug("Could not send info to %s (%s): "
647
			"set IFF_UP to 0",
648
			ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
649
		ifcp->ifc_flags &= ~IFF_UP;	/* As if down for AF_INET6 */
650
	}
651
	nrt = 0; np = ripbuf->rip6_nets;
652
}
653
654
/*
655
 * Generate RIP6_RESPONSE packets and send them.
656
 */
657
void
658
ripsend(struct ifc *ifcp, struct sockaddr_in6 *sin6, int flag)
659
{
660
	struct	riprt *rrt;
661
	struct	in6_addr *nh;	/* next hop */
662
	int	maxrte;
663
664
	if (qflag)
665
		return;
666
667
	if (ifcp == NULL) {
668
		/*
669
		 * Request from non-link local address is not
670
		 * a regular route6d update.
671
		 */
672
		maxrte = (IFMINMTU - sizeof(struct ip6_hdr) -
673
				sizeof(struct udphdr) -
674
				sizeof(struct rip6) + sizeof(struct netinfo6)) /
675
				sizeof(struct netinfo6);
676
		nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
677
		for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
678
			if (rrt->rrt_rflags & RRTF_NOADVERTISE)
679
				continue;
680
			/* Put the route to the buffer */
681
			*np = rrt->rrt_info;
682
			np++; nrt++;
683
			if (nrt == maxrte) {
684
				ripflush(NULL, sin6);
685
				nh = NULL;
686
			}
687
		}
688
		if (nrt)	/* Send last packet */
689
			ripflush(NULL, sin6);
690
		return;
691
	}
692
693
	if ((flag & RRTF_SENDANYWAY) == 0 &&
694
	    (qflag || (ifcp->ifc_flags & IFF_LOOPBACK)))
695
		return;
696
697
	/* -N: no use */
698
	if (iff_find(ifcp, 'N') != NULL)
699
		return;
700
701
	/* -T: generate default route only */
702
	if (iff_find(ifcp, 'T') != NULL) {
703
		struct netinfo6 rrt_info;
704
		memset(&rrt_info, 0, sizeof(struct netinfo6));
705
		rrt_info.rip6_dest = in6addr_any;
706
		rrt_info.rip6_plen = 0;
707
		rrt_info.rip6_metric = 1;
708
		rrt_info.rip6_metric += ifcp->ifc_metric;
709
		rrt_info.rip6_tag = htons(routetag & 0xffff);
710
		np = ripbuf->rip6_nets;
711
		*np = rrt_info;
712
		nrt = 1;
713
		ripflush(ifcp, sin6);
714
		return;
715
	}
716
717
	maxrte = (ifcp->ifc_mtu - sizeof(struct ip6_hdr) -
718
			sizeof(struct udphdr) -
719
			sizeof(struct rip6) + sizeof(struct netinfo6)) /
720
			sizeof(struct netinfo6);
721
722
	nrt = 0; np = ripbuf->rip6_nets; nh = NULL;
723
	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
724
		if (rrt->rrt_rflags & RRTF_NOADVERTISE)
725
			continue;
726
727
		/* Need to check filter here */
728
		if (out_filter(rrt, ifcp) == 0)
729
			continue;
730
731
		/* Check split horizon and other conditions */
732
		if (tobeadv(rrt, ifcp) == 0)
733
			continue;
734
735
		/* Only considers the routes with flag if specified */
736
		if ((flag & RRTF_CHANGED) &&
737
		    (rrt->rrt_rflags & RRTF_CHANGED) == 0)
738
			continue;
739
740
		/* Check nexthop */
741
		if (rrt->rrt_index == ifcp->ifc_index &&
742
		    !IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_gw) &&
743
		    (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR) == 0) {
744
			if (nh == NULL || !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw)) {
745
				if (nrt == maxrte - 2)
746
					ripflush(ifcp, sin6);
747
				np->rip6_dest = rrt->rrt_gw;
748
				if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest))
749
					SET_IN6_LINKLOCAL_IFINDEX(np->rip6_dest, 0);
750
				np->rip6_plen = 0;
751
				np->rip6_tag = 0;
752
				np->rip6_metric = NEXTHOP_METRIC;
753
				nh = &rrt->rrt_gw;
754
				np++; nrt++;
755
			}
756
		} else if (nh && (rrt->rrt_index != ifcp->ifc_index ||
757
			          !IN6_ARE_ADDR_EQUAL(nh, &rrt->rrt_gw) ||
758
				  rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)) {
759
			/* Reset nexthop */
760
			if (nrt == maxrte - 2)
761
				ripflush(ifcp, sin6);
762
			memset(np, 0, sizeof(struct netinfo6));
763
			np->rip6_metric = NEXTHOP_METRIC;
764
			nh = NULL;
765
			np++; nrt++;
766
		}
767
768
		/* Put the route to the buffer */
769
		*np = rrt->rrt_info;
770
		np++; nrt++;
771
		if (nrt == maxrte) {
772
			ripflush(ifcp, sin6);
773
			nh = NULL;
774
		}
775
	}
776
	if (nrt)	/* Send last packet */
777
		ripflush(ifcp, sin6);
778
}
779
780
/*
781
 * outbound filter logic, per-route/interface.
782
 */
783
int
784
out_filter(struct riprt *rrt, struct ifc *ifcp)
785
{
786
	struct iff *iffp;
787
	struct in6_addr ia;
788
	int ok;
789
790
	/*
791
	 * -A: filter out less specific routes, if we have aggregated
792
	 * route configured.
793
	 */
794
	for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
795
		if (iffp->iff_type != 'A')
796
			continue;
797
		if (rrt->rrt_info.rip6_plen <= iffp->iff_plen)
798
			continue;
799
		ia = rrt->rrt_info.rip6_dest;
800
		applyplen(&ia, iffp->iff_plen);
801
		if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr))
802
			return 0;
803
	}
804
805
	/*
806
	 * if it is an aggregated route, advertise it only to the
807
	 * interfaces specified on -A.
808
	 */
809
	if ((rrt->rrt_rflags & RRTF_AGGREGATE) != 0) {
810
		ok = 0;
811
		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
812
			if (iffp->iff_type != 'A')
813
				continue;
814
			if (rrt->rrt_info.rip6_plen == iffp->iff_plen &&
815
			    IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
816
			    &iffp->iff_addr)) {
817
				ok = 1;
818
				break;
819
			}
820
		}
821
		if (!ok)
822
			return 0;
823
	}
824
825
	/*
826
	 * -O: advertise only if prefix matches the configured prefix.
827
	 */
828
	if (iff_find(ifcp, 'O')) {
829
		ok = 0;
830
		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
831
			if (iffp->iff_type != 'O')
832
				continue;
833
			if (rrt->rrt_info.rip6_plen < iffp->iff_plen)
834
				continue;
835
			ia = rrt->rrt_info.rip6_dest;
836
			applyplen(&ia, iffp->iff_plen);
837
			if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
838
				ok = 1;
839
				break;
840
			}
841
		}
842
		if (!ok)
843
			return 0;
844
	}
845
846
	/* the prefix should be advertised */
847
	return 1;
848
}
849
850
/*
851
 * Determine if the route is to be advertised on the specified interface.
852
 * It checks options specified in the arguments and the split horizon rule.
853
 */
854
int
855
tobeadv(struct riprt *rrt, struct ifc *ifcp)
856
{
857
858
	/* Special care for static routes */
859
	if (rrt->rrt_flags & RTF_STATIC) {
860
		/* XXX don't advertise reject/blackhole routes */
861
		if (rrt->rrt_flags & (RTF_REJECT | RTF_BLACKHOLE))
862
			return 0;
863
864
		if (Sflag)	/* Yes, advertise it anyway */
865
			return 1;
866
		if (sflag && rrt->rrt_index != ifcp->ifc_index)
867
			return 1;
868
		return 0;
869
	}
870
	/* Regular split horizon */
871
	if (hflag == 0 && rrt->rrt_index == ifcp->ifc_index)
872
		return 0;
873
	return 1;
874
}
875
876
/*
877
 * Send a rip packet actually.
878
 */
879
int
880
sendpacket(struct sockaddr_in6 *sin6, int len)
881
{
882
	struct msghdr m;
883
	struct cmsghdr *cm;
884
	struct iovec iov[2];
885
	union {
886
		struct cmsghdr hdr;
887
		u_char buf[CMSG_SPACE(sizeof(struct in6_pktinfo))];
888
	} cmsgbuf;
889
	struct in6_pktinfo *pi;
890
	int idx;
891
	struct sockaddr_in6 sincopy;
892
893
	/* do not overwrite the given sin */
894
	sincopy = *sin6;
895
	sin6 = &sincopy;
896
897
	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr) ||
898
	    IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
899
		/* XXX: do not mix the interface index and link index */
900
		idx = IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr);
901
		SET_IN6_LINKLOCAL_IFINDEX(sin6->sin6_addr, 0);
902
		sin6->sin6_scope_id = idx;
903
	} else
904
		idx = 0;
905
906
	m.msg_name = (caddr_t)sin6;
907
	m.msg_namelen = sizeof(*sin6);
908
	iov[0].iov_base = (caddr_t)ripbuf;
909
	iov[0].iov_len = len;
910
	m.msg_iov = iov;
911
	m.msg_iovlen = 1;
912
	if (!idx) {
913
		m.msg_control = NULL;
914
		m.msg_controllen = 0;
915
	} else {
916
		memset(&cmsgbuf, 0, sizeof(cmsgbuf));
917
		m.msg_control = (caddr_t)&cmsgbuf.buf;
918
		m.msg_controllen = sizeof(cmsgbuf.buf);
919
		cm = CMSG_FIRSTHDR(&m);
920
		cm->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
921
		cm->cmsg_level = IPPROTO_IPV6;
922
		cm->cmsg_type = IPV6_PKTINFO;
923
		pi = (struct in6_pktinfo *)CMSG_DATA(cm);
924
		memset(&pi->ipi6_addr, 0, sizeof(pi->ipi6_addr)); /*::*/
925
		pi->ipi6_ifindex = idx;
926
	}
927
928
	if (sendmsg(ripsock, &m, 0) < 0) {
929
		log_debug("sendmsg: %s", strerror(errno));
930
		return errno;
931
	}
932
933
	return 0;
934
}
935
936
/*
937
 * Receive and process RIP packets.  Update the routes/kernel forwarding
938
 * table if necessary.
939
 */
940
void
941
riprecv(void)
942
{
943
	struct	ifc *ifcp, *ic;
944
	struct	sockaddr_in6 fsock;
945
	struct	in6_addr nh;	/* next hop */
946
	struct	rip6 *rp;
947
	struct	netinfo6 *np, *nq;
948
	struct	riprt *rrt;
949
	ssize_t	len, nn;
950
	unsigned int need_trigger, idx;
951
	char	buf[4 * RIP6_MAXMTU];
952
	time_t	t;
953
	struct msghdr m;
954
	struct cmsghdr *cm;
955
	struct iovec iov[2];
956
	union {
957
		struct cmsghdr hdr;
958
		u_char buf[CMSG_SPACE(sizeof(struct in6_pktinfo)) +
959
		    CMSG_SPACE(sizeof(int))];
960
	} cmsgbuf;
961
	struct in6_pktinfo *pi = NULL;
962
	int *hlimp = NULL;
963
	struct iff *iffp;
964
	struct in6_addr ia;
965
	int ok;
966
	time_t t_half_lifetime;
967
968
	need_trigger = 0;
969
970
	m.msg_name = (caddr_t)&fsock;
971
	m.msg_namelen = sizeof(fsock);
972
	iov[0].iov_base = (caddr_t)buf;
973
	iov[0].iov_len = sizeof(buf);
974
	m.msg_iov = iov;
975
	m.msg_iovlen = 1;
976
	m.msg_control = (caddr_t)&cmsgbuf.buf;
977
	m.msg_controllen = sizeof(cmsgbuf.buf);
978
	if ((len = recvmsg(ripsock, &m, 0)) < 0) {
979
		fatal("recvmsg");
980
		/*NOTREACHED*/
981
	}
982
	idx = 0;
983
	for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(&m);
984
	     cm;
985
	     cm = (struct cmsghdr *)CMSG_NXTHDR(&m, cm)) {
986
		if (cm->cmsg_level != IPPROTO_IPV6)
987
			continue;
988
		switch (cm->cmsg_type) {
989
		case IPV6_PKTINFO:
990
			if (cm->cmsg_len != CMSG_LEN(sizeof(*pi))) {
991
				log_debug(
992
				    "invalid cmsg length for IPV6_PKTINFO");
993
				return;
994
			}
995
			pi = (struct in6_pktinfo *)(CMSG_DATA(cm));
996
			idx = pi->ipi6_ifindex;
997
			break;
998
		case IPV6_HOPLIMIT:
999
			if (cm->cmsg_len != CMSG_LEN(sizeof(int))) {
1000
				log_debug(
1001
				    "invalid cmsg length for IPV6_HOPLIMIT");
1002
				return;
1003
			}
1004
			hlimp = (int *)CMSG_DATA(cm);
1005
			break;
1006
		}
1007
	}
1008
	if (idx && IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr))
1009
		SET_IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr, idx);
1010
1011
	if (len < sizeof(struct rip6)) {
1012
		log_debug("Packet too short");
1013
		return;
1014
	}
1015
1016
	if (pi == NULL || hlimp == NULL) {
1017
		/*
1018
		 * This can happen when the kernel failed to allocate memory
1019
		 * for the ancillary data.  Although we might be able to handle
1020
		 * some cases without this info, those are minor and not so
1021
		 * important, so it's better to discard the packet for safer
1022
		 * operation.
1023
		 */
1024
		log_debug("IPv6 packet information cannot be retrieved");
1025
		return;
1026
	}
1027
1028
	nh = fsock.sin6_addr;
1029
	nn = (len - sizeof(struct rip6) + sizeof(struct netinfo6)) /
1030
		sizeof(struct netinfo6);
1031
	rp = (struct rip6 *)buf;
1032
	np = rp->rip6_nets;
1033
1034
	if (rp->rip6_vers != RIP6_VERSION) {
1035
		log_debug("Incorrect RIP version %d", rp->rip6_vers);
1036
		return;
1037
	}
1038
	if (rp->rip6_cmd == RIP6_REQUEST) {
1039
		if (idx && idx < nindex2ifc) {
1040
			ifcp = index2ifc[idx];
1041
			riprequest(ifcp, np, nn, &fsock);
1042
		} else {
1043
			riprequest(NULL, np, nn, &fsock);
1044
		}
1045
		return;
1046
	}
1047
1048
	if (!IN6_IS_ADDR_LINKLOCAL(&fsock.sin6_addr)) {
1049
		log_debug("Response from non-ll addr: %s",
1050
		    inet6_n2p(&fsock.sin6_addr));
1051
		return;		/* Ignore packets from non-link-local addr */
1052
	}
1053
	if (ntohs(fsock.sin6_port) != RIP6_PORT) {
1054
		log_debug("Response from non-rip port from %s",
1055
		    inet6_n2p(&fsock.sin6_addr));
1056
		return;
1057
	}
1058
	if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && *hlimp != 255) {
1059
		log_debug(
1060
		    "Response packet with a smaller hop limit (%d) from %s",
1061
		    *hlimp, inet6_n2p(&fsock.sin6_addr));
1062
		return;
1063
	}
1064
	/*
1065
	 * Further validation: since this program does not send off-link
1066
	 * requests, an incoming response must always come from an on-link
1067
	 * node.  Although this is normally ensured by the source address
1068
	 * check above, it may not 100% be safe because there are router
1069
	 * implementations that (invalidly) allow a packet with a link-local
1070
	 * source address to be forwarded to a different link.
1071
	 * So we also check whether the destination address is a link-local
1072
	 * address or the hop limit is 255.  Note that RFC2080 does not require
1073
	 * the specific hop limit for a unicast response, so we cannot assume
1074
	 * the limitation.
1075
	 */
1076
	if (!IN6_IS_ADDR_LINKLOCAL(&pi->ipi6_addr) && *hlimp != 255) {
1077
		log_debug(
1078
		    "Response packet possibly from an off-link node: "
1079
		    "from %s to %s hlim=%d",
1080
		    inet6_n2p(&fsock.sin6_addr), inet6_n2p(&pi->ipi6_addr),
1081
		    *hlimp);
1082
		return;
1083
	}
1084
1085
	idx = IN6_LINKLOCAL_IFINDEX(fsock.sin6_addr);
1086
	ifcp = (idx < nindex2ifc) ? index2ifc[idx] : NULL;
1087
	if (!ifcp) {
1088
		log_debug("Packets to unknown interface index %d", idx);
1089
		return;		/* Ignore it */
1090
	}
1091
	if (IN6_ARE_ADDR_EQUAL(&ifcp->ifc_mylladdr, &fsock.sin6_addr))
1092
		return;		/* The packet is from me; ignore */
1093
	if (rp->rip6_cmd != RIP6_RESPONSE) {
1094
		log_debug("Invalid command %d", rp->rip6_cmd);
1095
		return;
1096
	}
1097
1098
	/* -N: no use */
1099
	if (iff_find(ifcp, 'N') != NULL)
1100
		return;
1101
1102
	log_debug("Recv(%s): from %s.%d info(%zd)",
1103
	    ifcp->ifc_name, inet6_n2p(&nh), ntohs(fsock.sin6_port), nn);
1104
1105
	t = time(NULL);
1106
	t_half_lifetime = t - (RIP_LIFETIME/2);
1107
	for (; nn; nn--, np++) {
1108
		if (np->rip6_metric == NEXTHOP_METRIC) {
1109
			/* modify neighbor address */
1110
			if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1111
				nh = np->rip6_dest;
1112
				SET_IN6_LINKLOCAL_IFINDEX(nh, idx);
1113
				log_debug("\tNexthop: %s", inet6_n2p(&nh));
1114
			} else if (IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest)) {
1115
				nh = fsock.sin6_addr;
1116
				log_debug("\tNexthop: %s", inet6_n2p(&nh));
1117
			} else {
1118
				nh = fsock.sin6_addr;
1119
				log_debug("\tInvalid Nexthop: %s",
1120
				    inet6_n2p(&np->rip6_dest));
1121
			}
1122
			continue;
1123
		}
1124
		if (IN6_IS_ADDR_MULTICAST(&np->rip6_dest)) {
1125
			log_debug("\tMulticast netinfo6: %s/%d [%d]",
1126
				inet6_n2p(&np->rip6_dest),
1127
				np->rip6_plen, np->rip6_metric);
1128
			continue;
1129
		}
1130
		if (IN6_IS_ADDR_LOOPBACK(&np->rip6_dest)) {
1131
			log_debug("\tLoopback netinfo6: %s/%d [%d]",
1132
				inet6_n2p(&np->rip6_dest),
1133
				np->rip6_plen, np->rip6_metric);
1134
			continue;
1135
		}
1136
		if (IN6_IS_ADDR_LINKLOCAL(&np->rip6_dest)) {
1137
			log_debug("\tLink Local netinfo6: %s/%d [%d]",
1138
				inet6_n2p(&np->rip6_dest),
1139
				np->rip6_plen, np->rip6_metric);
1140
			continue;
1141
		}
1142
		/* may need to pass sitelocal prefix in some case, however*/
1143
		if (IN6_IS_ADDR_SITELOCAL(&np->rip6_dest) && !lflag) {
1144
			log_debug("\tSite Local netinfo6: %s/%d [%d]",
1145
				inet6_n2p(&np->rip6_dest),
1146
				np->rip6_plen, np->rip6_metric);
1147
			continue;
1148
		}
1149
		if (dflag >= 2) {
1150
			log_enqueue("\tnetinfo6: %s/%d [%d]",
1151
			    inet6_n2p(&np->rip6_dest),
1152
			    np->rip6_plen, np->rip6_metric);
1153
			if (np->rip6_tag)
1154
				log_enqueue("  tag=0x%04x",
1155
				    ntohs(np->rip6_tag) & 0xffff);
1156
			ia = np->rip6_dest;
1157
			applyplen(&ia, np->rip6_plen);
1158
			if (!IN6_ARE_ADDR_EQUAL(&ia, &np->rip6_dest))
1159
				log_enqueue(" [junk outside prefix]");
1160
		}
1161
1162
		/*
1163
		 * -L: listen only if the prefix matches the configuration
1164
		 */
1165
		ok = 1;		/* if there's no L filter, it is ok */
1166
		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
1167
			if (iffp->iff_type != 'L')
1168
				continue;
1169
			ok = 0;
1170
			if (np->rip6_plen < iffp->iff_plen)
1171
				continue;
1172
			/* special rule: ::/0 means default, not "in /0" */
1173
			if (iffp->iff_plen == 0 && np->rip6_plen > 0)
1174
				continue;
1175
			ia = np->rip6_dest;
1176
			applyplen(&ia, iffp->iff_plen);
1177
			if (IN6_ARE_ADDR_EQUAL(&ia, &iffp->iff_addr)) {
1178
				ok = 1;
1179
				break;
1180
			}
1181
		}
1182
1183
		if (!ok) {
1184
			if (dflag >= 2)
1185
				log_debug("  (filtered)");
1186
			continue;
1187
		}
1188
1189
		if (dflag >= 2)
1190
			log_debug("");
1191
1192
		np->rip6_metric++;
1193
		np->rip6_metric += ifcp->ifc_metric;
1194
		if (np->rip6_metric > HOPCNT_INFINITY6)
1195
			np->rip6_metric = HOPCNT_INFINITY6;
1196
1197
		applyplen(&np->rip6_dest, np->rip6_plen);
1198
		if ((rrt = rtsearch(np, NULL)) != NULL) {
1199
			if (rrt->rrt_t == 0)
1200
				continue;	/* Intf route has priority */
1201
			nq = &rrt->rrt_info;
1202
			if (nq->rip6_metric > np->rip6_metric) {
1203
				if (rrt->rrt_index == ifcp->ifc_index &&
1204
				    IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1205
					/* Small metric from the same gateway */
1206
					nq->rip6_metric = np->rip6_metric;
1207
				} else {
1208
					/* Better route found */
1209
					rrt->rrt_index = ifcp->ifc_index;
1210
					/* Update routing table */
1211
					delroute(nq, &rrt->rrt_gw);
1212
					rrt->rrt_gw = nh;
1213
					*nq = *np;
1214
					addroute(rrt, &nh, ifcp);
1215
				}
1216
				rrt->rrt_rflags |= RRTF_CHANGED;
1217
				rrt->rrt_t = t;
1218
				need_trigger = 1;
1219
			} else if (nq->rip6_metric < np->rip6_metric &&
1220
				   rrt->rrt_index == ifcp->ifc_index &&
1221
				   IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1222
				/* Got worse route from same gw */
1223
				nq->rip6_metric = np->rip6_metric;
1224
				rrt->rrt_t = t;
1225
				rrt->rrt_rflags |= RRTF_CHANGED;
1226
				need_trigger = 1;
1227
			} else if (nq->rip6_metric == np->rip6_metric &&
1228
				   np->rip6_metric < HOPCNT_INFINITY6) {
1229
				if (rrt->rrt_index == ifcp->ifc_index &&
1230
				   IN6_ARE_ADDR_EQUAL(&nh, &rrt->rrt_gw)) {
1231
					/* same metric, same route from same gw */
1232
					rrt->rrt_t = t;
1233
				} else if (rrt->rrt_t < t_half_lifetime) {
1234
					/* Better route found */
1235
					rrt->rrt_index = ifcp->ifc_index;
1236
					/* Update routing table */
1237
					delroute(nq, &rrt->rrt_gw);
1238
					rrt->rrt_gw = nh;
1239
					*nq = *np;
1240
					addroute(rrt, &nh, ifcp);
1241
					rrt->rrt_rflags |= RRTF_CHANGED;
1242
					rrt->rrt_t = t;
1243
				}
1244
			}
1245
			/*
1246
			 * if nq->rip6_metric == HOPCNT_INFINITY6 then
1247
			 * do not update age value.  Do nothing.
1248
			 */
1249
		} else if (np->rip6_metric < HOPCNT_INFINITY6) {
1250
			/* Got a new valid route */
1251
			if ((rrt = calloc(1, sizeof(struct riprt))) == NULL) {
1252
				fatal("calloc: struct riprt");
1253
				/*NOTREACHED*/
1254
			}
1255
			nq = &rrt->rrt_info;
1256
1257
			rrt->rrt_index = ifcp->ifc_index;
1258
			rrt->rrt_flags = RTF_UP|RTF_GATEWAY;
1259
			rrt->rrt_gw = nh;
1260
			*nq = *np;
1261
			applyplen(&nq->rip6_dest, nq->rip6_plen);
1262
			if (nq->rip6_plen == sizeof(struct in6_addr) * 8)
1263
				rrt->rrt_flags |= RTF_HOST;
1264
1265
			/* Put the route to the list */
1266
			rrt->rrt_next = riprt;
1267
			riprt = rrt;
1268
			/* Update routing table */
1269
			addroute(rrt, &nh, ifcp);
1270
			rrt->rrt_rflags |= RRTF_CHANGED;
1271
			need_trigger = 1;
1272
			rrt->rrt_t = t;
1273
		}
1274
	}
1275
	/* XXX need to care the interval between triggered updates */
1276
	if (need_trigger) {
1277
		if (nextalarm > time(NULL) + RIP_TRIG_INT6_MAX) {
1278
			for (ic = ifc; ic; ic = ic->ifc_next) {
1279
				if (ifcp->ifc_index == ic->ifc_index)
1280
					continue;
1281
				if (ic->ifc_flags & IFF_UP)
1282
					ripsend(ic, &ic->ifc_ripsin,
1283
						RRTF_CHANGED);
1284
			}
1285
		}
1286
		/* Reset the flag */
1287
		for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1288
			rrt->rrt_rflags &= ~RRTF_CHANGED;
1289
	}
1290
}
1291
1292
/*
1293
 * Send all routes request packet to the specified interface.
1294
 */
1295
void
1296
sendrequest(struct ifc *ifcp)
1297
{
1298
	struct netinfo6 *np;
1299
	int error;
1300
1301
	if (ifcp->ifc_flags & IFF_LOOPBACK)
1302
		return;
1303
	ripbuf->rip6_cmd = RIP6_REQUEST;
1304
	np = ripbuf->rip6_nets;
1305
	memset(np, 0, sizeof(struct netinfo6));
1306
	np->rip6_metric = HOPCNT_INFINITY6;
1307
	log_debug("Send rtdump Request to %s (%s)",
1308
		ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1309
	error = sendpacket(&ifcp->ifc_ripsin, RIPSIZE(1));
1310
	if (error == EAFNOSUPPORT) {
1311
		/* Protocol not supported */
1312
		log_debug("Could not send rtdump Request to %s (%s): "
1313
			"set IFF_UP to 0",
1314
			ifcp->ifc_name, inet6_n2p(&ifcp->ifc_ripsin.sin6_addr));
1315
		ifcp->ifc_flags &= ~IFF_UP;	/* As if down for AF_INET6 */
1316
	}
1317
	ripbuf->rip6_cmd = RIP6_RESPONSE;
1318
}
1319
1320
/*
1321
 * Process a RIP6_REQUEST packet.
1322
 */
1323
void
1324
riprequest(struct ifc *ifcp, struct netinfo6 *np, int nn,
1325
    struct sockaddr_in6 *sin6)
1326
{
1327
	int i;
1328
	struct riprt *rrt;
1329
1330
	if (!(nn == 1 && IN6_IS_ADDR_UNSPECIFIED(&np->rip6_dest) &&
1331
	      np->rip6_plen == 0 && np->rip6_metric == HOPCNT_INFINITY6)) {
1332
		/* Specific response, don't split-horizon */
1333
		log_debug("\tRIP Request");
1334
		for (i = 0; i < nn; i++, np++) {
1335
			rrt = rtsearch(np, NULL);
1336
			if (rrt)
1337
				np->rip6_metric = rrt->rrt_info.rip6_metric;
1338
			else
1339
				np->rip6_metric = HOPCNT_INFINITY6;
1340
		}
1341
		(void)sendpacket(sin6, RIPSIZE(nn));
1342
		return;
1343
	}
1344
	/* Whole routing table dump */
1345
	log_debug("\tRIP Request -- whole routing table");
1346
	ripsend(ifcp, sin6, RRTF_SENDANYWAY);
1347
}
1348
1349
/*
1350
 * Get information of each interface.
1351
 */
1352
void
1353
ifconfig(void)
1354
{
1355
	struct ifaddrs *ifap, *ifa;
1356
	struct ifc *ifcp;
1357
	struct ipv6_mreq mreq;
1358
	int s;
1359
1360
	if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
1361
		fatal("socket");
1362
		/*NOTREACHED*/
1363
	}
1364
1365
	if (getifaddrs(&ifap) != 0) {
1366
		fatal("getifaddrs");
1367
		/*NOTREACHED*/
1368
	}
1369
1370
	for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1371
		if (ifa->ifa_addr->sa_family != AF_INET6)
1372
			continue;
1373
		ifcp = ifc_find(ifa->ifa_name);
1374
		/* we are interested in multicast-capable interfaces */
1375
		if ((ifa->ifa_flags & IFF_MULTICAST) == 0)
1376
			continue;
1377
		if (!ifcp) {
1378
			/* new interface */
1379
			if ((ifcp = calloc(1, sizeof(struct ifc))) == NULL) {
1380
				fatal("calloc: struct ifc");
1381
				/*NOTREACHED*/
1382
			}
1383
			ifcp->ifc_index = -1;
1384
			ifcp->ifc_next = ifc;
1385
			ifc = ifcp;
1386
			nifc++;
1387
			ifcp->ifc_name = xstrdup(ifa->ifa_name);
1388
			ifcp->ifc_addr = 0;
1389
			ifcp->ifc_filter = 0;
1390
			ifcp->ifc_flags = ifa->ifa_flags;
1391
			log_debug("newif %s <%s>", ifcp->ifc_name,
1392
				ifflags(ifcp->ifc_flags));
1393
			if (!strcmp(ifcp->ifc_name, LOOPBACK_IF))
1394
				loopifcp = ifcp;
1395
		} else {
1396
			/* update flag, this may be up again */
1397
			if (ifcp->ifc_flags != ifa->ifa_flags) {
1398
				log_enqueue("%s: <%s> -> ", ifcp->ifc_name,
1399
					ifflags(ifcp->ifc_flags));
1400
				log_debug("<%s>", ifflags(ifa->ifa_flags));
1401
				ifcp->ifc_cflags |= IFC_CHANGED;
1402
			}
1403
			ifcp->ifc_flags = ifa->ifa_flags;
1404
		}
1405
		ifconfig1(ifa->ifa_name, ifa->ifa_addr, ifcp, s);
1406
		if ((ifcp->ifc_flags & (IFF_LOOPBACK | IFF_UP)) == IFF_UP
1407
		 && 0 < ifcp->ifc_index && !ifcp->ifc_joined) {
1408
			mreq.ipv6mr_multiaddr = ifcp->ifc_ripsin.sin6_addr;
1409
			mreq.ipv6mr_interface = ifcp->ifc_index;
1410
			if (setsockopt(ripsock, IPPROTO_IPV6, IPV6_JOIN_GROUP,
1411
			    &mreq, sizeof(mreq)) < 0) {
1412
				fatalx("IPV6_JOIN_GROUP");
1413
				/*NOTREACHED*/
1414
			}
1415
			log_debug("join %s %s", ifcp->ifc_name, RIP6_DEST);
1416
			ifcp->ifc_joined++;
1417
		}
1418
	}
1419
	close(s);
1420
	freeifaddrs(ifap);
1421
}
1422
1423
void
1424
ifconfig1(const char *name, const struct sockaddr *sa, struct ifc *ifcp, int s)
1425
{
1426
	struct	in6_ifreq ifr;
1427
	const struct sockaddr_in6 *sin6;
1428
	struct	ifac *ifa;
1429
	int	plen;
1430
	char	buf[BUFSIZ];
1431
1432
	sin6 = (const struct sockaddr_in6 *)sa;
1433
	if (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr) && !lflag)
1434
		return;
1435
	ifr.ifr_addr = *sin6;
1436
	strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name));
1437
	if (ioctl(s, SIOCGIFNETMASK_IN6, (char *)&ifr) < 0) {
1438
		fatal("ioctl: SIOCGIFNETMASK_IN6");
1439
		/*NOTREACHED*/
1440
	}
1441
	plen = sin6mask2len(&ifr.ifr_addr);
1442
	if ((ifa = ifa_match(ifcp, &sin6->sin6_addr, plen)) != NULL) {
1443
		/* same interface found */
1444
		/* need check if something changed */
1445
		/* XXX not yet implemented */
1446
		return;
1447
	}
1448
	/*
1449
	 * New address is found
1450
	 */
1451
	if ((ifa = calloc(1, sizeof(struct ifac))) == NULL) {
1452
		fatal("calloc: struct ifac");
1453
		/*NOTREACHED*/
1454
	}
1455
	ifa->ifa_conf = ifcp;
1456
	ifa->ifa_next = ifcp->ifc_addr;
1457
	ifcp->ifc_addr = ifa;
1458
	ifa->ifa_addr = sin6->sin6_addr;
1459
	ifa->ifa_plen = plen;
1460
	if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1461
		ifr.ifr_addr = *sin6;
1462
		if (ioctl(s, SIOCGIFDSTADDR_IN6, (char *)&ifr) < 0) {
1463
			fatal("ioctl: SIOCGIFDSTADDR_IN6");
1464
			/*NOTREACHED*/
1465
		}
1466
		ifa->ifa_raddr = ifr.ifr_dstaddr.sin6_addr;
1467
		inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr, buf, sizeof(buf));
1468
		log_debug("found address %s/%d -- %s",
1469
			inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen, buf);
1470
	} else {
1471
		log_debug("found address %s/%d",
1472
			inet6_n2p(&ifa->ifa_addr), ifa->ifa_plen);
1473
	}
1474
	if (ifcp->ifc_index < 0 && IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1475
		ifcp->ifc_mylladdr = ifa->ifa_addr;
1476
		ifcp->ifc_index = IN6_LINKLOCAL_IFINDEX(ifa->ifa_addr);
1477
		memcpy(&ifcp->ifc_ripsin, &ripsin, ripsin.ss_len);
1478
		SET_IN6_LINKLOCAL_IFINDEX(ifcp->ifc_ripsin.sin6_addr,
1479
			ifcp->ifc_index);
1480
		setindex2ifc(ifcp->ifc_index, ifcp);
1481
		ifcp->ifc_mtu = getifmtu(ifcp->ifc_index);
1482
		if (ifcp->ifc_mtu > RIP6_MAXMTU)
1483
			ifcp->ifc_mtu = RIP6_MAXMTU;
1484
		if (ioctl(s, SIOCGIFMETRIC, (char *)&ifr) < 0) {
1485
			fatal("ioctl: SIOCGIFMETRIC");
1486
			/*NOTREACHED*/
1487
		}
1488
		ifcp->ifc_metric = ifr.ifr_metric;
1489
		log_debug("\tindex: %d, mtu: %d, metric: %d",
1490
			ifcp->ifc_index, ifcp->ifc_mtu, ifcp->ifc_metric);
1491
	} else
1492
		ifcp->ifc_cflags |= IFC_CHANGED;
1493
}
1494
1495
/*
1496
 * Receive and process routing messages.
1497
 * Update interface information as necesssary.
1498
 */
1499
void
1500
rtrecv(void)
1501
{
1502
	char buf[BUFSIZ];
1503
	char *p, *q;
1504
	struct rt_msghdr *rtm;
1505
	struct ifa_msghdr *ifam;
1506
	struct if_msghdr *ifm;
1507
	int len;
1508
	struct ifc *ifcp, *ic;
1509
	int iface = 0, rtable = 0;
1510
	struct sockaddr_in6 *rta[RTAX_MAX];
1511
	struct sockaddr_in6 mask;
1512
	int i, addrs;
1513
	struct riprt *rrt;
1514
1515
	if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
1516
		perror("read from rtsock");
1517
		exit(1);
1518
	}
1519
	if (len < sizeof(*rtm)) {
1520
		log_debug("short read from rtsock: %d (should be > %zu)",
1521
			len, sizeof(*rtm));
1522
		return;
1523
	}
1524
	if (dflag >= 2) {
1525
		log_debug("rtmsg:");
1526
		for (i = 0; i < len; i++) {
1527
			log_enqueue("%02x ", buf[i] & 0xff);
1528
			if (i % 16 == 15)
1529
				log_debug("");
1530
		}
1531
		log_debug("");
1532
	}
1533
1534
	p = buf;
1535
	/* safety against bogus message */
1536
	if (((struct rt_msghdr *)p)->rtm_msglen <= 0) {
1537
		log_debug("bogus rtmsg: length=%d",
1538
		    ((struct rt_msghdr *)p)->rtm_msglen);
1539
		return;
1540
	}
1541
	if (((struct rt_msghdr *)p)->rtm_version != RTM_VERSION)
1542
		return;
1543
1544
	rtm = NULL;
1545
	ifam = NULL;
1546
	ifm = NULL;
1547
	switch (((struct rt_msghdr *)p)->rtm_type) {
1548
	case RTM_NEWADDR:
1549
	case RTM_DELADDR:
1550
		ifam = (struct ifa_msghdr *)p;
1551
		addrs = ifam->ifam_addrs;
1552
		q = (char *)(ifam + 1);
1553
		break;
1554
	case RTM_IFINFO:
1555
		ifm = (struct if_msghdr *)p;
1556
		addrs = ifm->ifm_addrs;
1557
		q = (char *)(ifm + 1);
1558
		break;
1559
	default:
1560
		rtm = (struct rt_msghdr *)p;
1561
		addrs = rtm->rtm_addrs;
1562
		q = (char *)(p + rtm->rtm_hdrlen);
1563
		if (rtm->rtm_pid == pid) {
1564
#if 0
1565
			log_debug("rtmsg looped back to me, ignored");
1566
#endif
1567
			return;
1568
		}
1569
		break;
1570
	}
1571
	memset(&rta, 0, sizeof(rta));
1572
	for (i = 0; i < RTAX_MAX; i++) {
1573
		if (addrs & (1 << i)) {
1574
			rta[i] = (struct sockaddr_in6 *)q;
1575
			q += ROUNDUP(rta[i]->sin6_len);
1576
		}
1577
	}
1578
1579
	log_debug("rtsock: %s (addrs=%x)",
1580
	    rttypes((struct rt_msghdr *)p), addrs);
1581
	if (dflag >= 2) {
1582
		for (i = 0;
1583
		     i < ((struct rt_msghdr *)p)->rtm_msglen;
1584
		     i++) {
1585
			log_enqueue("%02x ", p[i] & 0xff);
1586
			if (i % 16 == 15)
1587
				log_debug("");
1588
		}
1589
		log_debug("");
1590
	}
1591
	/*
1592
	 * Easy ones first.
1593
	 *
1594
	 * We may be able to optimize by using ifm->ifm_index or
1595
	 * ifam->ifam_index.  For simplicity we don't do that here.
1596
	 */
1597
	switch (((struct rt_msghdr *)p)->rtm_type) {
1598
	case RTM_NEWADDR:
1599
	case RTM_IFINFO:
1600
		iface++;
1601
		return;
1602
	case RTM_ADD:
1603
		rtable++;
1604
		return;
1605
	case RTM_LOSING:
1606
	case RTM_MISS:
1607
	case RTM_RESOLVE:
1608
	case RTM_GET:
1609
	case RTM_LOCK:
1610
		/* nothing to be done here */
1611
		log_debug("\tnothing to be done, ignored");
1612
		return;
1613
	}
1614
1615
#if 0
1616
	if (rta[RTAX_DST] == NULL) {
1617
		log_debug("\tno destination, ignored");
1618
		return;
1619
	}
1620
	if (rta[RTAX_DST]->sin6_family != AF_INET6) {
1621
		log_debug("\taf mismatch, ignored");
1622
		return;
1623
	}
1624
	if (IN6_IS_ADDR_LINKLOCAL(&rta[RTAX_DST]->sin6_addr)) {
1625
		log_debug("\tlinklocal destination, ignored");
1626
		return;
1627
	}
1628
	if (IN6_ARE_ADDR_EQUAL(&rta[RTAX_DST]->sin6_addr, &in6addr_loopback)) {
1629
		log_debug("\tloopback destination, ignored");
1630
		return;		/* Loopback */
1631
	}
1632
	if (IN6_IS_ADDR_MULTICAST(&rta[RTAX_DST]->sin6_addr)) {
1633
		log_debug("\tmulticast destination, ignored");
1634
		return;
1635
	}
1636
#endif
1637
1638
	/* hard ones */
1639
	switch (((struct rt_msghdr *)p)->rtm_type) {
1640
	case RTM_NEWADDR:
1641
	case RTM_IFINFO:
1642
	case RTM_ADD:
1643
	case RTM_LOSING:
1644
	case RTM_MISS:
1645
	case RTM_RESOLVE:
1646
	case RTM_GET:
1647
	case RTM_LOCK:
1648
		/* should already be handled */
1649
		fatalx("rtrecv: never reach here");
1650
		/*NOTREACHED*/
1651
	case RTM_DELETE:
1652
		if (!rta[RTAX_DST] || !rta[RTAX_GATEWAY]) {
1653
			log_debug("\tsome of dst/gw/netmask are "
1654
			    "unavailable, ignored");
1655
			break;
1656
		}
1657
		if ((rtm->rtm_flags & RTF_HOST) != 0) {
1658
			mask.sin6_len = sizeof(mask);
1659
			memset(&mask.sin6_addr, 0xff,
1660
			    sizeof(mask.sin6_addr));
1661
			rta[RTAX_NETMASK] = &mask;
1662
		} else if (!rta[RTAX_NETMASK]) {
1663
			log_debug("\tsome of dst/gw/netmask are "
1664
			    "unavailable, ignored");
1665
			break;
1666
		}
1667
		if (rt_del(rta[RTAX_DST], rta[RTAX_GATEWAY],
1668
			rta[RTAX_NETMASK]) == 0) {
1669
			rtable++;	/*just to be sure*/
1670
		}
1671
		break;
1672
	case RTM_CHANGE:
1673
	case RTM_REDIRECT:
1674
		log_debug("\tnot supported yet, ignored");
1675
		break;
1676
	case RTM_DELADDR:
1677
		if (!rta[RTAX_NETMASK] || !rta[RTAX_IFA]) {
1678
			log_debug("\tno netmask or ifa given, ignored");
1679
			break;
1680
		}
1681
		if (ifam->ifam_index < nindex2ifc)
1682
			ifcp = index2ifc[ifam->ifam_index];
1683
		else
1684
			ifcp = NULL;
1685
		if (!ifcp) {
1686
			log_debug("\tinvalid ifam_index %d, ignored",
1687
			    ifam->ifam_index);
1688
			break;
1689
		}
1690
		if (!rt_deladdr(ifcp, rta[RTAX_IFA], rta[RTAX_NETMASK]))
1691
			iface++;
1692
		break;
1693
	}
1694
1695
	if (iface) {
1696
		log_debug("rtsock: reconfigure interfaces, refresh interface routes");
1697
		ifconfig();
1698
		for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next)
1699
			if (ifcp->ifc_cflags & IFC_CHANGED) {
1700
				if (ifrt(ifcp, 1)) {
1701
					for (ic = ifc; ic; ic = ic->ifc_next) {
1702
						if (ifcp->ifc_index == ic->ifc_index)
1703
							continue;
1704
						if (ic->ifc_flags & IFF_UP)
1705
							ripsend(ic, &ic->ifc_ripsin,
1706
							RRTF_CHANGED);
1707
					}
1708
					/* Reset the flag */
1709
					for (rrt = riprt; rrt; rrt = rrt->rrt_next)
1710
						rrt->rrt_rflags &= ~RRTF_CHANGED;
1711
				}
1712
				ifcp->ifc_cflags &= ~IFC_CHANGED;
1713
			}
1714
	}
1715
	if (rtable) {
1716
		log_debug("rtsock: read routing table again");
1717
		krtread(1);
1718
	}
1719
}
1720
1721
/*
1722
 * remove specified route from the internal routing table.
1723
 */
1724
int
1725
rt_del(const struct sockaddr_in6 *sdst, const struct sockaddr_in6 *sgw,
1726
    const struct sockaddr_in6 *smask)
1727
{
1728
	const struct in6_addr *dst = NULL;
1729
	const struct in6_addr *gw = NULL;
1730
	int prefix;
1731
	struct netinfo6 ni6;
1732
	struct riprt *rrt = NULL;
1733
	time_t t_lifetime;
1734
1735
	if (sdst->sin6_family != AF_INET6) {
1736
		log_debug("\tother AF, ignored");
1737
		return -1;
1738
	}
1739
	if (IN6_IS_ADDR_LINKLOCAL(&sdst->sin6_addr)
1740
	 || IN6_ARE_ADDR_EQUAL(&sdst->sin6_addr, &in6addr_loopback)
1741
	 || IN6_IS_ADDR_MULTICAST(&sdst->sin6_addr)) {
1742
		log_debug("\taddress %s not interesting, ignored",
1743
			inet6_n2p(&sdst->sin6_addr));
1744
		return -1;
1745
	}
1746
	dst = &sdst->sin6_addr;
1747
	if (sgw->sin6_family == AF_INET6) {
1748
		/* easy case */
1749
		gw = &sgw->sin6_addr;
1750
		prefix = sin6mask2len(smask);
1751
	} else if (sgw->sin6_family == AF_LINK) {
1752
		/*
1753
		 * Interface route... a hard case.  We need to get the prefix
1754
		 * length from the kernel, but we now are parsing rtmsg.
1755
		 * We'll purge matching routes from my list, then get the
1756
		 * fresh list.
1757
		 */
1758
		struct riprt *longest;
1759
		log_debug("\t%s is a interface route, guessing prefixlen",
1760
			inet6_n2p(dst));
1761
		longest = NULL;
1762
		for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
1763
			if (IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
1764
					&sdst->sin6_addr)
1765
			 && IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
1766
				if (!longest
1767
				 || longest->rrt_info.rip6_plen <
1768
						 rrt->rrt_info.rip6_plen) {
1769
					longest = rrt;
1770
				}
1771
			}
1772
		}
1773
		rrt = longest;
1774
		if (!rrt) {
1775
			log_debug("\tno matching interface route found");
1776
			return -1;
1777
		}
1778
		gw = &in6addr_loopback;
1779
		prefix = rrt->rrt_info.rip6_plen;
1780
	} else {
1781
		log_debug("\tunsupported af: (gw=%d)", sgw->sin6_family);
1782
		return -1;
1783
	}
1784
1785
	log_enqueue("\tdeleting %s/%d ", inet6_n2p(dst), prefix);
1786
	log_debug("gw %s", inet6_n2p(gw));
1787
	t_lifetime = time(NULL) - RIP_LIFETIME;
1788
	/* age route for interface address */
1789
	memset(&ni6, 0, sizeof(ni6));
1790
	ni6.rip6_dest = *dst;
1791
	ni6.rip6_plen = prefix;
1792
	applyplen(&ni6.rip6_dest, ni6.rip6_plen);	/*to be sure*/
1793
	log_debug("\tfind route %s/%d", inet6_n2p(&ni6.rip6_dest),
1794
		ni6.rip6_plen);
1795
	if (!rrt && (rrt = rtsearch(&ni6, NULL)) == NULL) {
1796
		log_debug("\tno route found");
1797
		return -1;
1798
	}
1799
#if 0
1800
	if ((rrt->rrt_flags & RTF_STATIC) == 0) {
1801
		log_debug("\tyou can delete static routes only");
1802
	} else
1803
#endif
1804
	if (!IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, gw)) {
1805
		log_enqueue("\tgw mismatch: %s <-> ",
1806
			inet6_n2p(&rrt->rrt_gw));
1807
		log_debug("%s", inet6_n2p(gw));
1808
	} else {
1809
		log_debug("\troute found, age it");
1810
		if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1811
			rrt->rrt_t = t_lifetime;
1812
			rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1813
		}
1814
	}
1815
	return 0;
1816
}
1817
1818
/*
1819
 * remove specified address from internal interface/routing table.
1820
 */
1821
int
1822
rt_deladdr(struct ifc *ifcp, const struct sockaddr_in6 *sifa,
1823
    const struct sockaddr_in6 *smask)
1824
{
1825
	const struct in6_addr *addr = NULL;
1826
	int prefix;
1827
	struct ifac *ifa = NULL;
1828
	struct netinfo6 ni6;
1829
	struct riprt *rrt = NULL;
1830
	time_t t_lifetime;
1831
	int updated = 0;
1832
1833
	if (sifa->sin6_family != AF_INET6) {
1834
		log_debug("\tother AF, ignored");
1835
		return -1;
1836
	}
1837
	addr = &sifa->sin6_addr;
1838
	prefix = sin6mask2len(smask);
1839
1840
	log_debug("\tdeleting %s/%d from %s",
1841
		inet6_n2p(addr), prefix, ifcp->ifc_name);
1842
	ifa = ifa_match(ifcp, addr, prefix);
1843
	if (!ifa) {
1844
		log_debug("\tno matching ifa found for %s/%d on %s",
1845
			inet6_n2p(addr), prefix, ifcp->ifc_name);
1846
		return -1;
1847
	}
1848
	if (ifa->ifa_conf != ifcp) {
1849
		log_debug("\taddress table corrupt: back pointer does not match "
1850
			"(%s != %s)",
1851
			ifcp->ifc_name, ifa->ifa_conf->ifc_name);
1852
		return -1;
1853
	}
1854
	/* remove ifa from interface */
1855
	if (ifcp->ifc_addr == ifa)
1856
		ifcp->ifc_addr = ifa->ifa_next;
1857
	else {
1858
		struct ifac *p;
1859
		for (p = ifcp->ifc_addr; p; p = p->ifa_next) {
1860
			if (p->ifa_next == ifa) {
1861
				p->ifa_next = ifa->ifa_next;
1862
				break;
1863
			}
1864
		}
1865
	}
1866
	ifa->ifa_next = NULL;
1867
	ifa->ifa_conf = NULL;
1868
	t_lifetime = time(NULL) - RIP_LIFETIME;
1869
	/* age route for interface address */
1870
	memset(&ni6, 0, sizeof(ni6));
1871
	ni6.rip6_dest = ifa->ifa_addr;
1872
	ni6.rip6_plen = ifa->ifa_plen;
1873
	applyplen(&ni6.rip6_dest, ni6.rip6_plen);
1874
	log_debug("\tfind interface route %s/%d on %d",
1875
		inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen, ifcp->ifc_index);
1876
	if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1877
		struct in6_addr none;
1878
		memset(&none, 0, sizeof(none));
1879
		if (rrt->rrt_index == ifcp->ifc_index &&
1880
		    (IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &none) ||
1881
		     IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw))) {
1882
			log_debug("\troute found, age it");
1883
			if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1884
				rrt->rrt_t = t_lifetime;
1885
				rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
1886
			}
1887
			updated++;
1888
		} else {
1889
			log_debug("\tnon-interface route found: %s/%d on %d",
1890
				inet6_n2p(&rrt->rrt_info.rip6_dest),
1891
				rrt->rrt_info.rip6_plen,
1892
				rrt->rrt_index);
1893
		}
1894
	} else
1895
		log_debug("\tno interface route found");
1896
	/* age route for p2p destination */
1897
	if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1898
		memset(&ni6, 0, sizeof(ni6));
1899
		ni6.rip6_dest = ifa->ifa_raddr;
1900
		ni6.rip6_plen = 128;
1901
		applyplen(&ni6.rip6_dest, ni6.rip6_plen);	/*to be sure*/
1902
		log_debug("\tfind p2p route %s/%d on %d",
1903
			inet6_n2p(&ni6.rip6_dest), ni6.rip6_plen,
1904
			ifcp->ifc_index);
1905
		if ((rrt = rtsearch(&ni6, NULL)) != NULL) {
1906
			if (rrt->rrt_index == ifcp->ifc_index &&
1907
			    IN6_ARE_ADDR_EQUAL(&rrt->rrt_gw, &ifa->ifa_addr)) {
1908
				log_debug("\troute found, age it");
1909
				if (rrt->rrt_t == 0 || rrt->rrt_t > t_lifetime) {
1910
					rrt->rrt_t = t_lifetime;
1911
					rrt->rrt_info.rip6_metric =
1912
					    HOPCNT_INFINITY6;
1913
					updated++;
1914
				}
1915
			} else {
1916
				log_debug("\tnon-p2p route found: %s/%d on %d",
1917
					inet6_n2p(&rrt->rrt_info.rip6_dest),
1918
					rrt->rrt_info.rip6_plen,
1919
					rrt->rrt_index);
1920
			}
1921
		} else
1922
			log_debug("\tno p2p route found");
1923
	}
1924
	return updated ? 0 : -1;
1925
}
1926
1927
/*
1928
 * Get each interface address and put those interface routes to the route
1929
 * list.
1930
 */
1931
int
1932
ifrt(struct ifc *ifcp, int again)
1933
{
1934
	struct ifac *ifa;
1935
	struct riprt *rrt = NULL, *search_rrt, *prev_rrt, *loop_rrt;
1936
	struct netinfo6 *np;
1937
	time_t t_lifetime;
1938
	int need_trigger = 0;
1939
1940
#if 0
1941
	if (ifcp->ifc_flags & IFF_LOOPBACK)
1942
		return 0;			/* ignore loopback */
1943
#endif
1944
1945
	if (ifcp->ifc_flags & IFF_POINTOPOINT) {
1946
		ifrt_p2p(ifcp, again);
1947
		return 0;
1948
	}
1949
1950
	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
1951
		if (IN6_IS_ADDR_LINKLOCAL(&ifa->ifa_addr)) {
1952
#if 0
1953
			log_debug("route: %s on %s: "
1954
			    "skip linklocal interface address",
1955
			    inet6_n2p(&ifa->ifa_addr), ifcp->ifc_name);
1956
#endif
1957
			continue;
1958
		}
1959
		if (IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_addr)) {
1960
#if 0
1961
			log_debug("route: %s: skip unspec interface address",
1962
			    ifcp->ifc_name);
1963
#endif
1964
			continue;
1965
		}
1966
		if (IN6_IS_ADDR_LOOPBACK(&ifa->ifa_addr)) {
1967
#if 0
1968
			log_debug("route: %s: skip loopback address",
1969
			    ifcp->ifc_name);
1970
#endif
1971
			continue;
1972
		}
1973
		if (ifcp->ifc_flags & IFF_UP) {
1974
			if ((rrt = calloc(1, sizeof(struct riprt))) == NULL)
1975
				fatal("calloc: struct riprt");
1976
			rrt->rrt_index = ifcp->ifc_index;
1977
			rrt->rrt_t = 0;	/* don't age */
1978
			rrt->rrt_info.rip6_dest = ifa->ifa_addr;
1979
			rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
1980
			rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
1981
			rrt->rrt_info.rip6_plen = ifa->ifa_plen;
1982
			if (ifa->ifa_plen == 128)
1983
				rrt->rrt_flags = RTF_HOST;
1984
			else
1985
				rrt->rrt_flags = RTF_CLONING;
1986
			rrt->rrt_rflags |= RRTF_CHANGED;
1987
			applyplen(&rrt->rrt_info.rip6_dest, ifa->ifa_plen);
1988
			memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
1989
			rrt->rrt_gw = ifa->ifa_addr;
1990
			np = &rrt->rrt_info;
1991
			search_rrt = rtsearch(np, &prev_rrt);
1992
			if (search_rrt != NULL) {
1993
				if (search_rrt->rrt_info.rip6_metric <=
1994
				    rrt->rrt_info.rip6_metric) {
1995
					/* Already have better route */
1996
					if (!again) {
1997
						log_debug("route: %s/%d: "
1998
						    "already registered (%s)",
1999
						    inet6_n2p(&np->rip6_dest), np->rip6_plen,
2000
						    ifcp->ifc_name);
2001
					}
2002
					goto next;
2003
				}
2004
2005
				if (prev_rrt)
2006
					prev_rrt->rrt_next = rrt->rrt_next;
2007
				else
2008
					riprt = rrt->rrt_next;
2009
				delroute(&rrt->rrt_info, &rrt->rrt_gw);
2010
			}
2011
			/* Attach the route to the list */
2012
			log_debug("route: %s/%d: register route (%s)",
2013
			    inet6_n2p(&np->rip6_dest), np->rip6_plen,
2014
			    ifcp->ifc_name);
2015
			rrt->rrt_next = riprt;
2016
			riprt = rrt;
2017
			addroute(rrt, &rrt->rrt_gw, ifcp);
2018
			rrt = NULL;
2019
			sendrequest(ifcp);
2020
			ripsend(ifcp, &ifcp->ifc_ripsin, 0);
2021
			need_trigger = 1;
2022
		} else {
2023
			for (loop_rrt = riprt; loop_rrt; loop_rrt = loop_rrt->rrt_next) {
2024
				if (loop_rrt->rrt_index == ifcp->ifc_index) {
2025
					t_lifetime = time(NULL) - RIP_LIFETIME;
2026
					if (loop_rrt->rrt_t == 0 || loop_rrt->rrt_t > t_lifetime) {
2027
						loop_rrt->rrt_t = t_lifetime;
2028
						loop_rrt->rrt_info.rip6_metric = HOPCNT_INFINITY6;
2029
						loop_rrt->rrt_rflags |= RRTF_CHANGED;
2030
						need_trigger = 1;
2031
					}
2032
				}
2033
			}
2034
                }
2035
	next:
2036
		free(rrt);
2037
	}
2038
	return need_trigger;
2039
}
2040
2041
/*
2042
 * there are couple of p2p interface routing models.  "behavior" lets
2043
 * you pick one.  it looks that gated behavior fits best with BSDs,
2044
 * since BSD kernels do not look at prefix length on p2p interfaces.
2045
 */
2046
void
2047
ifrt_p2p(struct ifc *ifcp, int again)
2048
{
2049
	struct ifac *ifa;
2050
	struct riprt *rrt, *orrt, *prevrrt;
2051
	struct netinfo6 *np;
2052
	struct in6_addr addr, dest;
2053
	int advert, ignore, i;
2054
#define P2PADVERT_NETWORK	1
2055
#define P2PADVERT_ADDR		2
2056
#define P2PADVERT_DEST		4
2057
#define P2PADVERT_MAX		4
2058
	const enum { CISCO, GATED, ROUTE6D } behavior = GATED;
2059
	const char *category = "";
2060
	const char *noadv;
2061
2062
	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2063
		addr = ifa->ifa_addr;
2064
		dest = ifa->ifa_raddr;
2065
		applyplen(&addr, ifa->ifa_plen);
2066
		applyplen(&dest, ifa->ifa_plen);
2067
		advert = ignore = 0;
2068
		switch (behavior) {
2069
		case CISCO:
2070
			/*
2071
			 * honor addr/plen, just like normal shared medium
2072
			 * interface.  this may cause trouble if you reuse
2073
			 * addr/plen on other interfaces.
2074
			 *
2075
			 * advertise addr/plen.
2076
			 */
2077
			advert |= P2PADVERT_NETWORK;
2078
			break;
2079
		case GATED:
2080
			/*
2081
			 * prefixlen on p2p interface is meaningless.
2082
			 * advertise addr/128 and dest/128.
2083
			 *
2084
			 * do not install network route to route6d routing
2085
			 * table (if we do, it would prevent route installation
2086
			 * for other p2p interface that shares addr/plen).
2087
			 *
2088
			 * XXX what should we do if dest is ::?  it will not
2089
			 * get announced anyways (see following filter),
2090
			 * but we need to think.
2091
			 */
2092
			advert |= P2PADVERT_ADDR;
2093
			advert |= P2PADVERT_DEST;
2094
			ignore |= P2PADVERT_NETWORK;
2095
			break;
2096
		case ROUTE6D:
2097
			/*
2098
			 * just for testing.  actually the code is redundant
2099
			 * given the current p2p interface address assignment
2100
			 * rule for kame kernel.
2101
			 *
2102
			 * intent:
2103
			 *	A/n -> announce A/n
2104
			 *	A B/n, A and B share prefix -> A/n (= B/n)
2105
			 *	A B/n, do not share prefix -> A/128 and B/128
2106
			 * actually, A/64 and A B/128 are the only cases
2107
			 * permitted by the kernel:
2108
			 *	A/64 -> A/64
2109
			 *	A B/128 -> A/128 and B/128
2110
			 */
2111
			if (!IN6_IS_ADDR_UNSPECIFIED(&ifa->ifa_raddr)) {
2112
				if (IN6_ARE_ADDR_EQUAL(&addr, &dest))
2113
					advert |= P2PADVERT_NETWORK;
2114
				else {
2115
					advert |= P2PADVERT_ADDR;
2116
					advert |= P2PADVERT_DEST;
2117
					ignore |= P2PADVERT_NETWORK;
2118
				}
2119
			} else
2120
				advert |= P2PADVERT_NETWORK;
2121
			break;
2122
		}
2123
2124
		for (i = 1; i <= P2PADVERT_MAX; i *= 2) {
2125
			if ((ignore & i) != 0)
2126
				continue;
2127
			if ((rrt = calloc(1, sizeof(struct riprt))) == NULL) {
2128
				fatal("calloc: struct riprt");
2129
				/*NOTREACHED*/
2130
			}
2131
			rrt->rrt_index = ifcp->ifc_index;
2132
			rrt->rrt_t = 0;	/* don't age */
2133
			switch (i) {
2134
			case P2PADVERT_NETWORK:
2135
				rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2136
				rrt->rrt_info.rip6_plen = ifa->ifa_plen;
2137
				applyplen(&rrt->rrt_info.rip6_dest,
2138
				    ifa->ifa_plen);
2139
				category = "network";
2140
				break;
2141
			case P2PADVERT_ADDR:
2142
				rrt->rrt_info.rip6_dest = ifa->ifa_addr;
2143
				rrt->rrt_info.rip6_plen = 128;
2144
				rrt->rrt_gw = in6addr_loopback;
2145
				category = "addr";
2146
				break;
2147
			case P2PADVERT_DEST:
2148
				rrt->rrt_info.rip6_dest = ifa->ifa_raddr;
2149
				rrt->rrt_info.rip6_plen = 128;
2150
				rrt->rrt_gw = ifa->ifa_addr;
2151
				category = "dest";
2152
				break;
2153
			}
2154
			if (IN6_IS_ADDR_UNSPECIFIED(&rrt->rrt_info.rip6_dest) ||
2155
			    IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_info.rip6_dest)) {
2156
#if 0
2157
				log_debug("route: %s: skip unspec/linklocal "
2158
				    "(%s on %s)", category, ifcp->ifc_name);
2159
#endif
2160
				free(rrt);
2161
				continue;
2162
			}
2163
			if ((advert & i) == 0) {
2164
				rrt->rrt_rflags |= RRTF_NOADVERTISE;
2165
				noadv = ", NO-ADV";
2166
			} else
2167
				noadv = "";
2168
			rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2169
			rrt->rrt_info.rip6_metric = 1 + ifcp->ifc_metric;
2170
			np = &rrt->rrt_info;
2171
			orrt = rtsearch(np, &prevrrt);
2172
			if (!orrt) {
2173
				/* Attach the route to the list */
2174
				log_debug("route: %s/%d: register route "
2175
				    "(%s on %s%s)",
2176
				    inet6_n2p(&np->rip6_dest), np->rip6_plen,
2177
				    category, ifcp->ifc_name, noadv);
2178
				rrt->rrt_next = riprt;
2179
				riprt = rrt;
2180
			} else if (rrt->rrt_index != orrt->rrt_index ||
2181
			    rrt->rrt_info.rip6_metric != orrt->rrt_info.rip6_metric) {
2182
				/* swap route */
2183
				rrt->rrt_next = orrt->rrt_next;
2184
				if (prevrrt)
2185
					prevrrt->rrt_next = rrt;
2186
				else
2187
					riprt = rrt;
2188
				free(orrt);
2189
2190
				log_debug("route: %s/%d: update (%s on %s%s)",
2191
				    inet6_n2p(&np->rip6_dest), np->rip6_plen,
2192
				    category, ifcp->ifc_name, noadv);
2193
			} else {
2194
				/* Already found */
2195
				if (!again) {
2196
					log_debug("route: %s/%d: "
2197
					    "already registered (%s on %s%s)",
2198
					    inet6_n2p(&np->rip6_dest),
2199
					    np->rip6_plen, category,
2200
					    ifcp->ifc_name, noadv);
2201
				}
2202
				free(rrt);
2203
			}
2204
		}
2205
	}
2206
#undef P2PADVERT_NETWORK
2207
#undef P2PADVERT_ADDR
2208
#undef P2PADVERT_DEST
2209
#undef P2PADVERT_MAX
2210
}
2211
2212
int
2213
getifmtu(int ifindex)
2214
{
2215
	int	mib[6];
2216
	char	*buf = NULL;
2217
	size_t	needed;
2218
	struct	if_msghdr *ifm;
2219
	int	mtu;
2220
2221
	mib[0] = CTL_NET;
2222
	mib[1] = PF_ROUTE;
2223
	mib[2] = 0;
2224
	mib[3] = AF_INET6;
2225
	mib[4] = NET_RT_IFLIST;
2226
	mib[5] = ifindex;
2227
	while (1) {
2228
		if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1)
2229
			fatal("sysctl estimate NET_RT_IFLIST");
2230
		if (needed == 0)
2231
			break;
2232
		if ((buf = realloc(buf, needed)) == NULL)
2233
			fatal(NULL);
2234
		if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) {
2235
			if (errno == ENOMEM)
2236
				continue;
2237
			fatal("sysctl NET_RT_IFLIST");
2238
		}
2239
		break;
2240
	}
2241
	ifm = (struct if_msghdr *)buf;
2242
	mtu = ifm->ifm_data.ifi_mtu;
2243
	free(buf);
2244
	return mtu;
2245
}
2246
2247
const char *
2248
rttypes(struct rt_msghdr *rtm)
2249
{
2250
#define	RTTYPE(s, f) \
2251
do { \
2252
	if (rtm->rtm_type == (f)) \
2253
		return (s); \
2254
} while (0)
2255
	RTTYPE("ADD", RTM_ADD);
2256
	RTTYPE("DELETE", RTM_DELETE);
2257
	RTTYPE("CHANGE", RTM_CHANGE);
2258
	RTTYPE("GET", RTM_GET);
2259
	RTTYPE("LOSING", RTM_LOSING);
2260
	RTTYPE("REDIRECT", RTM_REDIRECT);
2261
	RTTYPE("MISS", RTM_MISS);
2262
	RTTYPE("LOCK", RTM_LOCK);
2263
	RTTYPE("RESOLVE", RTM_RESOLVE);
2264
	RTTYPE("NEWADDR", RTM_NEWADDR);
2265
	RTTYPE("DELADDR", RTM_DELADDR);
2266
	RTTYPE("IFINFO", RTM_IFINFO);
2267
#ifdef RTM_OIFINFO
2268
	RTTYPE("OIFINFO", RTM_OIFINFO);
2269
#endif
2270
#ifdef RTM_IFANNOUNCE
2271
	RTTYPE("IFANNOUNCE", RTM_IFANNOUNCE);
2272
#endif
2273
#ifdef RTM_NEWMADDR
2274
	RTTYPE("NEWMADDR", RTM_NEWMADDR);
2275
#endif
2276
#ifdef RTM_DELMADDR
2277
	RTTYPE("DELMADDR", RTM_DELMADDR);
2278
#endif
2279
#undef RTTYPE
2280
	return NULL;
2281
}
2282
2283
const char *
2284
rtflags(struct rt_msghdr *rtm)
2285
{
2286
	static char buf[BUFSIZ];
2287
2288
	/*
2289
	 * letter conflict should be okay.  painful when *BSD diverges...
2290
	 */
2291
	strlcpy(buf, "", sizeof(buf));
2292
#define	RTFLAG(s, f) \
2293
do { \
2294
	if (rtm->rtm_flags & (f)) \
2295
		strlcat(buf, (s), sizeof(buf)); \
2296
} while (0)
2297
	RTFLAG("U", RTF_UP);
2298
	RTFLAG("G", RTF_GATEWAY);
2299
	RTFLAG("H", RTF_HOST);
2300
	RTFLAG("R", RTF_REJECT);
2301
	RTFLAG("D", RTF_DYNAMIC);
2302
	RTFLAG("M", RTF_MODIFIED);
2303
	RTFLAG("d", RTF_DONE);
2304
	RTFLAG("m", RTF_MULTICAST);
2305
	RTFLAG("C", RTF_CLONING);
2306
	RTFLAG("c", RTF_CLONED);
2307
	RTFLAG("L", RTF_LLINFO);
2308
	RTFLAG("S", RTF_STATIC);
2309
	RTFLAG("B", RTF_BLACKHOLE);
2310
	RTFLAG("3", RTF_PROTO3);
2311
	RTFLAG("2", RTF_PROTO2);
2312
	RTFLAG("1", RTF_PROTO1);
2313
	RTFLAG("b", RTF_BROADCAST);
2314
#undef RTFLAG
2315
	return buf;
2316
}
2317
2318
const char *
2319
ifflags(int flags)
2320
{
2321
	static char buf[BUFSIZ];
2322
2323
	strlcpy(buf, "", sizeof(buf));
2324
#define	IFFLAG(s, f) \
2325
do { \
2326
	if (flags & (f)) { \
2327
		if (buf[0]) \
2328
			strlcat(buf, ",", sizeof(buf)); \
2329
		strlcat(buf, (s), sizeof(buf)); \
2330
	} \
2331
} while (0)
2332
	IFFLAG("UP", IFF_UP);
2333
	IFFLAG("BROADCAST", IFF_BROADCAST);
2334
	IFFLAG("DEBUG", IFF_DEBUG);
2335
	IFFLAG("LOOPBACK", IFF_LOOPBACK);
2336
	IFFLAG("POINTOPOINT", IFF_POINTOPOINT);
2337
#ifdef IFF_NOTRAILERS
2338
	IFFLAG("NOTRAILERS", IFF_NOTRAILERS);
2339
#endif
2340
#ifdef IFF_SMART
2341
	IFFLAG("SMART", IFF_SMART);
2342
#endif
2343
	IFFLAG("RUNNING", IFF_RUNNING);
2344
	IFFLAG("NOARP", IFF_NOARP);
2345
	IFFLAG("PROMISC", IFF_PROMISC);
2346
	IFFLAG("ALLMULTI", IFF_ALLMULTI);
2347
	IFFLAG("OACTIVE", IFF_OACTIVE);
2348
	IFFLAG("SIMPLEX", IFF_SIMPLEX);
2349
	IFFLAG("LINK0", IFF_LINK0);
2350
	IFFLAG("LINK1", IFF_LINK1);
2351
	IFFLAG("LINK2", IFF_LINK2);
2352
	IFFLAG("MULTICAST", IFF_MULTICAST);
2353
#undef IFFLAG
2354
	return buf;
2355
}
2356
2357
void
2358
krtread(int again)
2359
{
2360
	int mib[6];
2361
	size_t msize;
2362
	char *buf, *p, *lim;
2363
	struct rt_msghdr *rtm;
2364
	int retry;
2365
	const char *errmsg;
2366
2367
	retry = 0;
2368
	buf = NULL;
2369
	mib[0] = CTL_NET;
2370
	mib[1] = PF_ROUTE;
2371
	mib[2] = 0;
2372
	mib[3] = AF_INET6;	/* Address family */
2373
	mib[4] = NET_RT_DUMP;	/* Dump the kernel routing table */
2374
	mib[5] = 0;		/* No flags */
2375
	do {
2376
		retry++;
2377
		free(buf);
2378
		buf = NULL;
2379
		errmsg = NULL;
2380
		if (sysctl(mib, 6, NULL, &msize, NULL, 0) < 0) {
2381
			errmsg = "sysctl estimate";
2382
			continue;
2383
		}
2384
		if ((buf = malloc(msize)) == NULL) {
2385
			errmsg = "malloc";
2386
			continue;
2387
		}
2388
		if (sysctl(mib, 6, buf, &msize, NULL, 0) < 0) {
2389
			errmsg = "sysctl NET_RT_DUMP";
2390
			continue;
2391
		}
2392
	} while (retry < 5 && errmsg != NULL);
2393
	if (errmsg) {
2394
		fatal(errmsg);
2395
		/*NOTREACHED*/
2396
	} else if (1 < retry)
2397
		log_info("NET_RT_DUMP %d retries", retry);
2398
2399
	lim = buf + msize;
2400
	for (p = buf; p < lim; p += rtm->rtm_msglen) {
2401
		rtm = (struct rt_msghdr *)p;
2402
		if (rtm->rtm_version != RTM_VERSION)
2403
			continue;
2404
		rt_entry(rtm, again);
2405
	}
2406
	free(buf);
2407
}
2408
2409
void
2410
rt_entry(struct rt_msghdr *rtm, int again)
2411
{
2412
	struct	sockaddr_in6 *sin6_dst, *sin6_gw, *sin6_mask;
2413
	struct	sockaddr_in6 *sin6_ifp;
2414
	char	*rtmp, *ifname = NULL;
2415
	struct	riprt *rrt, *orrt;
2416
	struct	netinfo6 *np;
2417
	int	s;
2418
2419
	sin6_dst = sin6_gw = sin6_mask = sin6_ifp = 0;
2420
	if ((rtm->rtm_flags & RTF_UP) == 0 || rtm->rtm_flags &
2421
		(RTF_CLONING|RTF_LLINFO|RTF_BLACKHOLE)) {
2422
		return;		/* not interested in the link route */
2423
	}
2424
	/* do not look at cloned routes */
2425
#ifdef RTF_WASCLONED
2426
	if (rtm->rtm_flags & RTF_WASCLONED)
2427
		return;
2428
#endif
2429
#ifdef RTF_CLONED
2430
	if (rtm->rtm_flags & RTF_CLONED)
2431
		return;
2432
#endif
2433
	/*
2434
	 * do not look at dynamic routes.
2435
	 * netbsd/openbsd cloned routes have UGHD.
2436
	 */
2437
	if (rtm->rtm_flags & RTF_DYNAMIC)
2438
		return;
2439
	rtmp = (char *)((char *)rtm + rtm->rtm_hdrlen);
2440
	/* Destination */
2441
	if ((rtm->rtm_addrs & RTA_DST) == 0)
2442
		return;		/* ignore routes without destination address */
2443
	sin6_dst = (struct sockaddr_in6 *)rtmp;
2444
	rtmp += ROUNDUP(sin6_dst->sin6_len);
2445
	if (rtm->rtm_addrs & RTA_GATEWAY) {
2446
		sin6_gw = (struct sockaddr_in6 *)rtmp;
2447
		rtmp += ROUNDUP(sin6_gw->sin6_len);
2448
	}
2449
	if (rtm->rtm_addrs & RTA_NETMASK) {
2450
		sin6_mask = (struct sockaddr_in6 *)rtmp;
2451
		rtmp += ROUNDUP(sin6_mask->sin6_len);
2452
	}
2453
	if (rtm->rtm_addrs & RTA_IFP) {
2454
		sin6_ifp = (struct sockaddr_in6 *)rtmp;
2455
		rtmp += ROUNDUP(sin6_ifp->sin6_len);
2456
	}
2457
2458
	/* Destination */
2459
	if (sin6_dst->sin6_family != AF_INET6)
2460
		return;
2461
	if (IN6_IS_ADDR_LINKLOCAL(&sin6_dst->sin6_addr))
2462
		return;		/* Link-local */
2463
	if (IN6_ARE_ADDR_EQUAL(&sin6_dst->sin6_addr, &in6addr_loopback))
2464
		return;		/* Loopback */
2465
	if (IN6_IS_ADDR_MULTICAST(&sin6_dst->sin6_addr))
2466
		return;
2467
2468
	if ((rrt = calloc(1, sizeof(struct riprt))) == NULL) {
2469
		fatal("calloc: struct riprt");
2470
		/*NOTREACHED*/
2471
	}
2472
	np = &rrt->rrt_info;
2473
	rrt->rrt_t = time(NULL);
2474
	if (aflag == 0 && (rtm->rtm_flags & RTF_STATIC))
2475
		rrt->rrt_t = 0;	/* Don't age static routes */
2476
	if ((rtm->rtm_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST)
2477
		rrt->rrt_t = 0;	/* Don't age non-gateway host routes */
2478
	np->rip6_tag = 0;
2479
	np->rip6_metric = 1;
2480
	rrt->rrt_flags = rtm->rtm_flags;
2481
	np->rip6_dest = sin6_dst->sin6_addr;
2482
2483
	/* Mask or plen */
2484
	if (rtm->rtm_flags & RTF_HOST)
2485
		np->rip6_plen = 128;	/* Host route */
2486
	else if (sin6_mask)
2487
		np->rip6_plen = sin6mask2len(sin6_mask);
2488
	else
2489
		np->rip6_plen = 0;
2490
2491
	orrt = rtsearch(np, NULL);
2492
	if (orrt && orrt->rrt_info.rip6_metric != HOPCNT_INFINITY6) {
2493
		/* Already found */
2494
		if (!again) {
2495
			log_debug("route: %s/%d flags %s: already registered",
2496
				inet6_n2p(&np->rip6_dest), np->rip6_plen,
2497
				rtflags(rtm));
2498
		}
2499
		free(rrt);
2500
		return;
2501
	}
2502
	/* Gateway */
2503
	if (!sin6_gw)
2504
		memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2505
	else {
2506
		if (sin6_gw->sin6_family == AF_INET6)
2507
			rrt->rrt_gw = sin6_gw->sin6_addr;
2508
		else if (sin6_gw->sin6_family == AF_LINK) {
2509
			/* XXX in case ppp link? */
2510
			rrt->rrt_gw = in6addr_loopback;
2511
		} else
2512
			memset(&rrt->rrt_gw, 0, sizeof(struct in6_addr));
2513
	}
2514
	log_enqueue("route: %s/%d flags %s",
2515
		inet6_n2p(&np->rip6_dest), np->rip6_plen, rtflags(rtm));
2516
	log_enqueue(" gw %s", inet6_n2p(&rrt->rrt_gw));
2517
2518
	/* Interface */
2519
	s = rtm->rtm_index;
2520
	if (s < nindex2ifc && index2ifc[s])
2521
		ifname = index2ifc[s]->ifc_name;
2522
	else {
2523
		log_debug(" not configured");
2524
		free(rrt);
2525
		return;
2526
	}
2527
	log_debug(" if %s sock %d", ifname, s);
2528
	rrt->rrt_index = s;
2529
2530
	/* Check gateway */
2531
	if (!IN6_IS_ADDR_LINKLOCAL(&rrt->rrt_gw) &&
2532
	    !IN6_IS_ADDR_LOOPBACK(&rrt->rrt_gw)) {
2533
		log_warnx("***** Gateway %s is not a link-local address.",
2534
			inet6_n2p(&rrt->rrt_gw));
2535
		log_warnx("*****     dest(%s) if(%s) -- Not optimized.",
2536
			inet6_n2p(&rrt->rrt_info.rip6_dest), ifname);
2537
		rrt->rrt_rflags |= RRTF_NH_NOT_LLADDR;
2538
	}
2539
2540
	/* Put it to the route list */
2541
	if (orrt && orrt->rrt_info.rip6_metric == HOPCNT_INFINITY6) {
2542
		/* replace route list */
2543
		rrt->rrt_next = orrt->rrt_next;
2544
		*orrt = *rrt;
2545
		log_debug("route: %s/%d flags %s: replace new route",
2546
		    inet6_n2p(&np->rip6_dest), np->rip6_plen,
2547
		    rtflags(rtm));
2548
		free(rrt);
2549
	} else {
2550
		rrt->rrt_next = riprt;
2551
		riprt = rrt;
2552
	}
2553
}
2554
2555
int
2556
addroute(struct riprt *rrt, const struct in6_addr *gw, struct ifc *ifcp)
2557
{
2558
	struct	netinfo6 *np;
2559
	u_char	buf[BUFSIZ], buf1[BUFSIZ], buf2[BUFSIZ];
2560
	struct	rt_msghdr	*rtm;
2561
	struct	sockaddr_in6	*sin6;
2562
	int	len;
2563
2564
	np = &rrt->rrt_info;
2565
	inet_ntop(AF_INET6, (const void *)gw, (char *)buf1, sizeof(buf1));
2566
	inet_ntop(AF_INET6, (void *)&ifcp->ifc_mylladdr, (char *)buf2, sizeof(buf2));
2567
	if (uflag)
2568
		log_info("RTADD: %s/%d gw %s [%d] ifa %s",
2569
		    inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2570
		    np->rip6_metric - 1, buf2);
2571
	else
2572
		log_debug("RTADD: %s/%d gw %s [%d] ifa %s",
2573
		    inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1,
2574
		    np->rip6_metric - 1, buf2);
2575
2576
	if (nflag)
2577
		return 0;
2578
2579
	memset(buf, 0, sizeof(buf));
2580
	rtm = (struct rt_msghdr *)buf;
2581
	rtm->rtm_type = RTM_ADD;
2582
	rtm->rtm_version = RTM_VERSION;
2583
	rtm->rtm_seq = ++seq;
2584
	rtm->rtm_flags = rrt->rrt_flags;
2585
	rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2586
	rtm->rtm_inits = RTV_HOPCOUNT;
2587
	sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2588
	/* Destination */
2589
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2590
	sin6->sin6_family = AF_INET6;
2591
	sin6->sin6_addr = np->rip6_dest;
2592
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2593
	/* Gateway */
2594
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2595
	sin6->sin6_family = AF_INET6;
2596
	sin6->sin6_addr = *gw;
2597
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2598
	/* Netmask */
2599
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2600
	sin6->sin6_family = AF_INET6;
2601
	sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2602
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2603
2604
	len = (char *)sin6 - (char *)buf;
2605
	rtm->rtm_msglen = len;
2606
	if (write(rtsock, buf, len) > 0)
2607
		return 0;
2608
2609
	if (errno == EEXIST) {
2610
		log_warnx("RTADD: Route already exists %s/%d gw %s",
2611
		    inet6_n2p(&np->rip6_dest), np->rip6_plen, buf1);
2612
	} else {
2613
		log_warnx("RTADD: Can not write to rtsock (addroute): %s",
2614
		    strerror(errno));
2615
	}
2616
	return -1;
2617
}
2618
2619
int
2620
delroute(struct netinfo6 *np, struct in6_addr *gw)
2621
{
2622
	u_char	buf[BUFSIZ], buf2[BUFSIZ];
2623
	struct	rt_msghdr	*rtm;
2624
	struct	sockaddr_in6	*sin6;
2625
	int	len;
2626
2627
	inet_ntop(AF_INET6, (void *)gw, (char *)buf2, sizeof(buf2));
2628
	if (uflag)
2629
		log_info("RTDEL: %s/%d gw %s", inet6_n2p(&np->rip6_dest),
2630
		    np->rip6_plen, buf2);
2631
	else
2632
		log_debug("RTDEL: %s/%d gw %s", inet6_n2p(&np->rip6_dest),
2633
		    np->rip6_plen, buf2);
2634
2635
	if (nflag)
2636
		return 0;
2637
2638
	memset(buf, 0, sizeof(buf));
2639
	rtm = (struct rt_msghdr *)buf;
2640
	rtm->rtm_type = RTM_DELETE;
2641
	rtm->rtm_version = RTM_VERSION;
2642
	rtm->rtm_seq = ++seq;
2643
	rtm->rtm_flags = RTF_UP | RTF_GATEWAY;
2644
	if (np->rip6_plen == sizeof(struct in6_addr) * 8)
2645
		rtm->rtm_flags |= RTF_HOST;
2646
	rtm->rtm_addrs = RTA_DST | RTA_GATEWAY | RTA_NETMASK;
2647
	sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2648
	/* Destination */
2649
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2650
	sin6->sin6_family = AF_INET6;
2651
	sin6->sin6_addr = np->rip6_dest;
2652
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2653
	/* Gateway */
2654
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2655
	sin6->sin6_family = AF_INET6;
2656
	sin6->sin6_addr = *gw;
2657
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2658
	/* Netmask */
2659
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2660
	sin6->sin6_family = AF_INET6;
2661
	sin6->sin6_addr = *(plen2mask(np->rip6_plen));
2662
	sin6 = (struct sockaddr_in6 *)((char *)sin6 + ROUNDUP(sin6->sin6_len));
2663
2664
	len = (char *)sin6 - (char *)buf;
2665
	rtm->rtm_msglen = len;
2666
	if (write(rtsock, buf, len) >= 0)
2667
		return 0;
2668
2669
	if (errno == ESRCH) {
2670
		log_warnx("RTDEL: Route does not exist: %s/%d gw %s",
2671
		    inet6_n2p(&np->rip6_dest), np->rip6_plen, buf2);
2672
	} else {
2673
		log_warnx("RTDEL: Can not write to rtsock (delroute): %s",
2674
		    strerror(errno));
2675
	}
2676
	return -1;
2677
}
2678
2679
struct in6_addr *
2680
getroute(struct netinfo6 *np, struct in6_addr *gw)
2681
{
2682
	u_char buf[BUFSIZ];
2683
	int len;
2684
	struct rt_msghdr *rtm;
2685
	struct sockaddr_in6 *sin6;
2686
2687
	rtm = (struct rt_msghdr *)buf;
2688
	len = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in6);
2689
	memset(rtm, 0, len);
2690
	rtm->rtm_type = RTM_GET;
2691
	rtm->rtm_version = RTM_VERSION;
2692
	rtm->rtm_seq = ++seq;
2693
	rtm->rtm_addrs = RTA_DST;
2694
	rtm->rtm_msglen = len;
2695
	sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2696
	sin6->sin6_len = sizeof(struct sockaddr_in6);
2697
	sin6->sin6_family = AF_INET6;
2698
	sin6->sin6_addr = np->rip6_dest;
2699
	if (write(rtsock, buf, len) < 0) {
2700
		if (errno == ESRCH)	/* No such route found */
2701
			return NULL;
2702
		perror("write to rtsock");
2703
		exit(1);
2704
	}
2705
	do {
2706
		if ((len = read(rtsock, buf, sizeof(buf))) < 0) {
2707
			perror("read from rtsock");
2708
			exit(1);
2709
		}
2710
		rtm = (struct rt_msghdr *)buf;
2711
	} while (rtm->rtm_version != RTM_VERSION ||
2712
	    rtm->rtm_seq != seq || rtm->rtm_pid != pid);
2713
	sin6 = (struct sockaddr_in6 *)&buf[sizeof(struct rt_msghdr)];
2714
	if (rtm->rtm_addrs & RTA_DST) {
2715
		sin6 = (struct sockaddr_in6 *)
2716
			((char *)sin6 + ROUNDUP(sin6->sin6_len));
2717
	}
2718
	if (rtm->rtm_addrs & RTA_GATEWAY) {
2719
		*gw = sin6->sin6_addr;
2720
		return gw;
2721
	}
2722
	return NULL;
2723
}
2724
2725
const char *
2726
inet6_n2p(const struct in6_addr *p)
2727
{
2728
	static char buf[BUFSIZ];
2729
2730
	return inet_ntop(AF_INET6, (const void *)p, buf, sizeof(buf));
2731
}
2732
2733
void
2734
ifrtdump(int sig)
2735
{
2736
2737
	ifdump(sig);
2738
	rtdump(sig);
2739
}
2740
2741
void
2742
ifdump(int sig)
2743
{
2744
	struct ifc *ifcp;
2745
	int i;
2746
2747
	log_info("%s: Interface Table Dump", hms());
2748
	log_info("  Number of interfaces: %d", nifc);
2749
	for (i = 0; i < 2; i++) {
2750
		log_info("  %sadvertising interfaces:", i ? "non-" : "");
2751
		for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
2752
			if (i == 0) {
2753
				if ((ifcp->ifc_flags & IFF_UP) == 0)
2754
					continue;
2755
				if (iff_find(ifcp, 'N') != NULL)
2756
					continue;
2757
			} else {
2758
				if (ifcp->ifc_flags & IFF_UP)
2759
					continue;
2760
			}
2761
			ifdump0(ifcp);
2762
		}
2763
	}
2764
	log_info("");
2765
}
2766
2767
void
2768
ifdump0(const struct ifc *ifcp)
2769
{
2770
	struct ifac *ifa;
2771
	struct iff *iffp;
2772
	char buf[BUFSIZ];
2773
	const char *ft;
2774
	int addr;
2775
2776
	log_info("    %s: index(%d) flags(%s) addr(%s) mtu(%d) metric(%d)",
2777
		ifcp->ifc_name, ifcp->ifc_index, ifflags(ifcp->ifc_flags),
2778
		inet6_n2p(&ifcp->ifc_mylladdr),
2779
		ifcp->ifc_mtu, ifcp->ifc_metric);
2780
	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
2781
		if (ifcp->ifc_flags & IFF_POINTOPOINT) {
2782
			inet_ntop(AF_INET6, (void *)&ifa->ifa_raddr,
2783
				buf, sizeof(buf));
2784
			log_info("\t%s/%d -- %s",
2785
				inet6_n2p(&ifa->ifa_addr),
2786
				ifa->ifa_plen, buf);
2787
		} else {
2788
			log_info("\t%s/%d",
2789
				inet6_n2p(&ifa->ifa_addr),
2790
				ifa->ifa_plen);
2791
		}
2792
	}
2793
	if (ifcp->ifc_filter) {
2794
		log_enqueue("\tFilter:");
2795
		for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
2796
			addr = 0;
2797
			switch (iffp->iff_type) {
2798
			case 'A':
2799
				ft = "Aggregate"; addr++; break;
2800
			case 'N':
2801
				ft = "No-use"; break;
2802
			case 'O':
2803
				ft = "Advertise-only"; addr++; break;
2804
			case 'T':
2805
				ft = "Default-only"; break;
2806
			case 'L':
2807
				ft = "Listen-only"; addr++; break;
2808
			default:
2809
				snprintf(buf, sizeof(buf), "Unknown-%c", iffp->iff_type);
2810
				ft = buf;
2811
				addr++;
2812
				break;
2813
			}
2814
			log_enqueue(" %s", ft);
2815
			if (addr) {
2816
				log_enqueue("(%s/%d)",
2817
				    inet6_n2p(&iffp->iff_addr), iffp->iff_plen);
2818
			}
2819
		}
2820
		log_info("");
2821
	}
2822
}
2823
2824
void
2825
rtdump(int sig)
2826
{
2827
	struct	riprt *rrt;
2828
	char	buf[BUFSIZ];
2829
	time_t	t, age;
2830
2831
	t = time(NULL);
2832
	log_info("%s: Routing Table Dump", hms());
2833
	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
2834
		if (rrt->rrt_t == 0)
2835
			age = 0;
2836
		else
2837
			age = t - rrt->rrt_t;
2838
		inet_ntop(AF_INET6, (void *)&rrt->rrt_info.rip6_dest,
2839
			buf, sizeof(buf));
2840
		log_enqueue("    %s/%d if(%d:%s) gw(%s) [%d] age(%lld)",
2841
			buf, rrt->rrt_info.rip6_plen, rrt->rrt_index,
2842
			index2ifc[rrt->rrt_index]->ifc_name,
2843
			inet6_n2p(&rrt->rrt_gw),
2844
			rrt->rrt_info.rip6_metric, (long long)age);
2845
		if (rrt->rrt_info.rip6_tag) {
2846
			log_enqueue(" tag(0x%04x)",
2847
				ntohs(rrt->rrt_info.rip6_tag) & 0xffff);
2848
		}
2849
		if (rrt->rrt_rflags & RRTF_NH_NOT_LLADDR)
2850
			log_enqueue(" NOT-LL");
2851
		if (rrt->rrt_rflags & RRTF_NOADVERTISE)
2852
			log_enqueue(" NO-ADV");
2853
		log_info("");
2854
	}
2855
}
2856
2857
/*
2858
 * Parse the -A (and -O) options and put corresponding filter object to the
2859
 * specified interface structures.  Each of the -A/O option has the following
2860
 * syntax:	-A 5f09:c400::/32,ef0,ef1  (aggregate)
2861
 * 		-O 5f09:c400::/32,ef0,ef1  (only when match)
2862
 */
2863
void
2864
filterconfig(void)
2865
{
2866
	int i;
2867
	char *p, *ap, *iflp, *ifname, *ep;
2868
	struct iff ftmp, *iff_obj;
2869
	struct ifc *ifcp;
2870
	struct riprt *rrt;
2871
#if 0
2872
	struct in6_addr gw;
2873
#endif
2874
	u_long plen;
2875
2876
	for (i = 0; i < nfilter; i++) {
2877
		ap = filter[i];
2878
		iflp = NULL;
2879
		ifcp = NULL;
2880
		if (filtertype[i] == 'N' || filtertype[i] == 'T') {
2881
			iflp = ap;
2882
			goto ifonly;
2883
		}
2884
		if ((p = strchr(ap, ',')) != NULL) {
2885
			*p++ = '\0';
2886
			iflp = p;
2887
		}
2888
		if ((p = strchr(ap, '/')) == NULL) {
2889
			log_warnx("no prefixlen specified for '%s'", ap);
2890
			fatalx("exiting");
2891
			/*NOTREACHED*/
2892
		}
2893
		*p++ = '\0';
2894
		if (inet_pton(AF_INET6, ap, &ftmp.iff_addr) != 1) {
2895
			log_warnx("invalid prefix specified for '%s'", ap);
2896
			fatalx("exiting");
2897
			/*NOTREACHED*/
2898
		}
2899
		errno = 0;
2900
		ep = NULL;
2901
		plen = strtoul(p, &ep, 10);
2902
		if (errno || !*p || *ep || plen > sizeof(ftmp.iff_addr) * 8) {
2903
			log_warnx("invalid prefix length specified for '%s'", ap);
2904
			fatalx("exiting");
2905
			/*NOTREACHED*/
2906
		}
2907
		ftmp.iff_plen = plen;
2908
		ftmp.iff_next = NULL;
2909
		applyplen(&ftmp.iff_addr, ftmp.iff_plen);
2910
ifonly:
2911
		ftmp.iff_type = filtertype[i];
2912
		if (iflp == NULL || *iflp == '\0') {
2913
			log_warnx("no interface specified for '%s'", ap);
2914
			fatal("exiting");
2915
			/*NOTREACHED*/
2916
		}
2917
		/* parse the interface listing portion */
2918
		while (iflp) {
2919
			ifname = iflp;
2920
			if ((iflp = strchr(iflp, ',')) != NULL)
2921
				*iflp++ = '\0';
2922
			ifcp = ifc_find(ifname);
2923
			if (ifcp == NULL) {
2924
				log_warnx("no interface %s exists", ifname);
2925
				fatalx("exiting");
2926
				/*NOTREACHED*/
2927
			}
2928
			iff_obj = malloc(sizeof(struct iff));
2929
			if (iff_obj == NULL) {
2930
				fatal("malloc of iff_obj");
2931
				/*NOTREACHED*/
2932
			}
2933
			memcpy((void *)iff_obj, (void *)&ftmp,
2934
			    sizeof(struct iff));
2935
			/* link it to the interface filter */
2936
			iff_obj->iff_next = ifcp->ifc_filter;
2937
			ifcp->ifc_filter = iff_obj;
2938
		}
2939
2940
		/*
2941
		 * -A: aggregate configuration.
2942
		 */
2943
		if (filtertype[i] != 'A')
2944
			continue;
2945
		/* put the aggregate to the kernel routing table */
2946
		rrt = calloc(1, sizeof(struct riprt));
2947
		if (rrt == NULL) {
2948
			fatal("calloc: rrt");
2949
			/*NOTREACHED*/
2950
		}
2951
		rrt->rrt_info.rip6_dest = ftmp.iff_addr;
2952
		rrt->rrt_info.rip6_plen = ftmp.iff_plen;
2953
		rrt->rrt_info.rip6_metric = 1;
2954
		rrt->rrt_info.rip6_tag = htons(routetag & 0xffff);
2955
		rrt->rrt_gw = in6addr_loopback;
2956
		rrt->rrt_flags = RTF_UP | RTF_REJECT;
2957
		rrt->rrt_rflags = RRTF_AGGREGATE;
2958
		rrt->rrt_t = 0;
2959
		rrt->rrt_index = loopifcp->ifc_index;
2960
#if 0
2961
		if (getroute(&rrt->rrt_info, &gw)) {
2962
#if 0
2963
			/*
2964
			 * When the address has already been registered in the
2965
			 * kernel routing table, it should be removed
2966
			 */
2967
			delroute(&rrt->rrt_info, &gw);
2968
#else
2969
			/* it is safer behavior */
2970
			errno = EINVAL;
2971
			fatal("%s/%u already in routing table, "
2972
			    "cannot aggregate",
2973
			    inet6_n2p(&rrt->rrt_info.rip6_dest),
2974
			    rrt->rrt_info.rip6_plen);
2975
			/*NOTREACHED*/
2976
#endif
2977
		}
2978
#endif
2979
		/* Put the route to the list */
2980
		rrt->rrt_next = riprt;
2981
		riprt = rrt;
2982
		log_debug("Aggregate: %s/%d for %s",
2983
			inet6_n2p(&ftmp.iff_addr), ftmp.iff_plen,
2984
			ifcp->ifc_name);
2985
		/* Add this route to the kernel */
2986
		if (nflag) 	/* do not modify kernel routing table */
2987
			continue;
2988
		addroute(rrt, &in6addr_loopback, loopifcp);
2989
	}
2990
}
2991
2992
/***************** utility functions *****************/
2993
2994
/*
2995
 * Returns a pointer to ifac whose address and prefix length matches
2996
 * with the address and prefix length specified in the arguments.
2997
 */
2998
struct ifac *
2999
ifa_match(const struct ifc *ifcp, const struct in6_addr *ia, int plen)
3000
{
3001
	struct ifac *ifa;
3002
3003
	for (ifa = ifcp->ifc_addr; ifa; ifa = ifa->ifa_next) {
3004
		if (IN6_ARE_ADDR_EQUAL(&ifa->ifa_addr, ia) &&
3005
		    ifa->ifa_plen == plen)
3006
			break;
3007
	}
3008
	return ifa;
3009
}
3010
3011
/*
3012
 * Return a pointer to riprt structure whose address and prefix length
3013
 * matches with the address and prefix length found in the argument.
3014
 * Note: This is not a rtalloc().  Therefore exact match is necessary.
3015
 */
3016
struct riprt *
3017
rtsearch(struct	netinfo6 *np, struct riprt **prev_rrt)
3018
{
3019
	struct	riprt	*rrt;
3020
3021
	if (prev_rrt)
3022
		*prev_rrt = NULL;
3023
	for (rrt = riprt; rrt; rrt = rrt->rrt_next) {
3024
		if (rrt->rrt_info.rip6_plen == np->rip6_plen &&
3025
		    IN6_ARE_ADDR_EQUAL(&rrt->rrt_info.rip6_dest,
3026
				       &np->rip6_dest))
3027
			return rrt;
3028
		if (prev_rrt)
3029
			*prev_rrt = rrt;
3030
	}
3031
	if (prev_rrt)
3032
		*prev_rrt = NULL;
3033
	return 0;
3034
}
3035
3036
int
3037
sin6mask2len(const struct sockaddr_in6 *sin6)
3038
{
3039
3040
	return mask2len(&sin6->sin6_addr,
3041
	    sin6->sin6_len - offsetof(struct sockaddr_in6, sin6_addr));
3042
}
3043
3044
int
3045
mask2len(const struct in6_addr *addr, int lenlim)
3046
{
3047
	int i = 0, j;
3048
	const u_char *p = (const u_char *)addr;
3049
3050
	for (j = 0; j < lenlim; j++, p++) {
3051
		if (*p != 0xff)
3052
			break;
3053
		i += 8;
3054
	}
3055
	if (j < lenlim) {
3056
		switch (*p) {
3057
#define	MASKLEN(m, l)	case m: do { i += l; break; } while (0)
3058
		MASKLEN(0xfe, 7); break;
3059
		MASKLEN(0xfc, 6); break;
3060
		MASKLEN(0xf8, 5); break;
3061
		MASKLEN(0xf0, 4); break;
3062
		MASKLEN(0xe0, 3); break;
3063
		MASKLEN(0xc0, 2); break;
3064
		MASKLEN(0x80, 1); break;
3065
#undef	MASKLEN
3066
		}
3067
	}
3068
	return i;
3069
}
3070
3071
void
3072
applyplen(struct in6_addr *ia, int plen)
3073
{
3074
	static const u_char plent[8] = {
3075
		0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe
3076
	};
3077
	u_char	*p;
3078
	int	i;
3079
3080
	p = ia->s6_addr;
3081
	for (i = 0; i < 16; i++) {
3082
		if (plen <= 0)
3083
			*p = 0;
3084
		else if (plen < 8)
3085
			*p &= plent[plen];
3086
		p++, plen -= 8;
3087
	}
3088
}
3089
3090
struct in6_addr *
3091
plen2mask(int n)
3092
{
3093
	static const int pl2m[9] = {
3094
		0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff
3095
	};
3096
	static struct in6_addr ia;
3097
	u_char	*p;
3098
	int	i;
3099
3100
	memset(&ia, 0, sizeof(struct in6_addr));
3101
	p = (u_char *)&ia;
3102
	for (i = 0; i < 16; i++, p++, n -= 8) {
3103
		if (n >= 8) {
3104
			*p = 0xff;
3105
			continue;
3106
		}
3107
		*p = pl2m[n];
3108
		break;
3109
	}
3110
	return &ia;
3111
}
3112
3113
char *
3114
xstrdup(const char *p)
3115
{
3116
	char *q;
3117
3118
	q = strdup(p);
3119
	if (q == NULL) {
3120
		fatal("strdup");
3121
		/*NOTREACHED*/
3122
	}
3123
	return q;
3124
}
3125
3126
const char *
3127
hms(void)
3128
{
3129
	static char buf[BUFSIZ];
3130
	time_t t;
3131
	struct	tm *tm;
3132
3133
	t = time(NULL);
3134
	if ((tm = localtime(&t)) == 0) {
3135
		fatal("localtime");
3136
		/*NOTREACHED*/
3137
	}
3138
	snprintf(buf, sizeof(buf), "%02d:%02d:%02d", tm->tm_hour, tm->tm_min,
3139
	    tm->tm_sec);
3140
	return buf;
3141
}
3142
3143
#define	RIPRANDDEV	1.0	/* 30 +- 15, max - min = 30 */
3144
3145
int
3146
ripinterval(int timer)
3147
{
3148
	double r = arc4random();
3149
	int interval;
3150
3151
	interval = (int)(timer + timer * RIPRANDDEV * (r / UINT32_MAX - 0.5));
3152
	nextalarm = time(NULL) + interval;
3153
	return interval;
3154
}
3155
3156
time_t
3157
ripsuptrig(void)
3158
{
3159
	time_t t;
3160
3161
	double r = arc4random();
3162
	t  = (int)(RIP_TRIG_INT6_MIN +
3163
		(RIP_TRIG_INT6_MAX - RIP_TRIG_INT6_MIN) * (r / UINT32_MAX));
3164
	sup_trig_update = time(NULL) + t;
3165
	return t;
3166
}
3167
3168
unsigned int
3169
if_maxindex(void)
3170
{
3171
	struct if_nameindex *p, *p0;
3172
	unsigned int max = 0;
3173
3174
	p0 = if_nameindex();
3175
	for (p = p0; p && p->if_index && p->if_name; p++) {
3176
		if (max < p->if_index)
3177
			max = p->if_index;
3178
	}
3179
	if_freenameindex(p0);
3180
	return max;
3181
}
3182
3183
struct ifc *
3184
ifc_find(char *name)
3185
{
3186
	struct ifc *ifcp;
3187
3188
	for (ifcp = ifc; ifcp; ifcp = ifcp->ifc_next) {
3189
		if (strcmp(name, ifcp->ifc_name) == 0)
3190
			return ifcp;
3191
	}
3192
	return (struct ifc *)NULL;
3193
}
3194
3195
struct iff *
3196
iff_find(struct ifc *ifcp, int type)
3197
{
3198
	struct iff *iffp;
3199
3200
	for (iffp = ifcp->ifc_filter; iffp; iffp = iffp->iff_next) {
3201
		if (iffp->iff_type == type)
3202
			return iffp;
3203
	}
3204
	return NULL;
3205
}
3206
3207
void
3208
setindex2ifc(int idx, struct ifc *ifcp)
3209
{
3210
	int n;
3211
	struct ifc **p;
3212
3213
	if (!index2ifc) {
3214
		nindex2ifc = 5;	/*initial guess*/
3215
		index2ifc = calloc(nindex2ifc, sizeof(*index2ifc));
3216
		if (index2ifc == NULL) {
3217
			fatal("calloc");
3218
			/*NOTREACHED*/
3219
		}
3220
	}
3221
	n = nindex2ifc;
3222
	while (nindex2ifc <= idx)
3223
		nindex2ifc *= 2;
3224
	if (n != nindex2ifc) {
3225
		p = reallocarray(index2ifc, nindex2ifc, sizeof(*index2ifc));
3226
		if (p == NULL) {
3227
			fatal("reallocarray");
3228
			/*NOTREACHED*/
3229
		}
3230
		memset(p + n, 0, (nindex2ifc - n) * sizeof(*index2ifc));
3231
		index2ifc = p;
3232
	}
3233
	index2ifc[idx] = ifcp;
3234
}