summaryrefslogtreecommitdiffstats
path: root/usr.sbin/pim6dd/routesock.c
blob: a2065b9674a531431fe49c85044f9f844b2d6ded (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/*
 *  Copyright (c) 1998 by the University of Southern California.
 *  All rights reserved.
 *
 *  Permission to use, copy, modify, and distribute this software and
 *  its documentation in source and binary forms for lawful
 *  purposes and without fee is hereby granted, provided
 *  that the above copyright notice appear in all copies and that both
 *  the copyright notice and this permission notice appear in supporting
 *  documentation, and that any documentation, advertising materials,
 *  and other materials related to such distribution and use acknowledge
 *  that the software was developed by the University of Southern
 *  California and/or Information Sciences Institute.
 *  The name of the University of Southern California may not
 *  be used to endorse or promote products derived from this software
 *  without specific prior written permission.
 *
 *  THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
 *  ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE.  THIS SOFTWARE IS
 *  PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
 *  INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND 
 *  NON-INFRINGEMENT.
 *
 *  IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
 *  SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
 *  TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
 *  THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 *  Other copyrights might apply to parts of this software and are so
 *  noted when applicable.
 */
/*
 *  Questions concerning this software should be directed to 
 *  Pavlin Ivanov Radoslavov (pavlin@catarina.usc.edu)
 *
 *  $Id: routesock.c,v 1.4 1999/11/19 04:05:48 sumikawa Exp $
 */
/*
 * Part of this program has been derived from mrouted.
 * The mrouted program is covered by the license in the accompanying file
 * named "LICENSE.mrouted".
 *
 * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
 * Leland Stanford Junior University.
 *
 * $FreeBSD$
 */

#include <sys/param.h>
#include <sys/file.h>
#include "defs.h"
#include <sys/socket.h>
#include <net/route.h>
#ifdef HAVE_ROUTING_SOCKETS
#include <net/if_dl.h>
#endif
#include <arpa/inet.h>
#include <netdb.h>
#include <stdlib.h>

#ifdef HAVE_ROUTING_SOCKETS
union sockunion {
    struct  sockaddr sa;
    struct  sockaddr_in6 sin6;
    struct  sockaddr_dl sdl;
} so_dst, so_ifp;
typedef union sockunion *sup;
int routing_socket;
int rtm_addrs, pid;
struct rt_metrics rt_metrics;
u_long rtm_inits;

/*
 * Local functions definitions.
 */
static int getmsg __P((register struct rt_msghdr *, int,
		       struct rpfctl *rpfinfo));

/*
 * TODO: check again!
 */
#ifdef IRIX
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(__uint64_t) - 1))) \
		    : sizeof(__uint64_t))
#else
#define ROUNDUP(a) ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) \
		    : sizeof(long))
#endif /* IRIX */

#ifdef HAVE_SA_LEN
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
#else
#define ADVANCE(x, n) (x += ROUNDUP(4))   /* TODO: a hack!! */
#endif

/* Open and initialize the routing socket */
int
init_routesock()
{
    pid = getpid();
    routing_socket = socket(PF_ROUTE, SOCK_RAW, AF_INET6);
    if (routing_socket < 0) {
	log(LOG_ERR, 0, "\nRouting socket error");
	return -1;
    }
    if (fcntl(routing_socket, F_SETFL, O_NONBLOCK) == -1){
	log(LOG_ERR, 0, "\n Routing socket error");
	return -1;
    }
#if 0
    {
    int off;
    
    off = 0;
    if (setsockopt(routing_socket, SOL_SOCKET,
		   SO_USELOOPBACK, (char *)&off,
		   sizeof(off)) < 0){
	log(LOG_ERR, 0 , "\n setsockopt(SO_USELOOPBACK,0)");
	return -1;
    }
    }
#endif	
    return 0;
}


struct {
    struct  rt_msghdr m_rtm;
    char    m_space[512];
} m_rtmsg;


/* get the rpf neighbor info */
int
k_req_incoming(source, rpfp)
    struct sockaddr_in6 *source;
    struct rpfctl *rpfp;
{
    int flags = RTF_STATIC; 
    register sup su;
    static int seq;
    int rlen;
    register char *cp = m_rtmsg.m_space;
    register int l;
    struct rpfctl rpfinfo;
	
/* TODO: a hack!!!! */
#ifdef HAVE_SA_LEN
#define NEXTADDR(w, u) \
    if (rtm_addrs & (w)) { \
	l = ROUNDUP(u.sa.sa_len); bcopy((char *)&(u), cp, l); cp += l;\
    }
#else
#define NEXTADDR(w, u) \
    if (rtm_addrs & (w)) { \
	l = ROUNDUP(4); bcopy((char *)&(u), cp, l); cp += l;\
    }
#endif /* HAVE_SA_LEN */

    /* initialize */
    memset(&rpfp->rpfneighbor, 0, sizeof(rpfp->rpfneighbor));
    rpfp->source = *source;
    
    /* check if local address or directly connected before calling the
     * routing socket
     */

    if ((rpfp->iif = find_vif_direct_local(source)) != NO_VIF) {
	rpfp->rpfneighbor = *source;
	return(TRUE);
    }       

    /* prepare the routing socket params */
    rtm_addrs |= RTA_DST;
    rtm_addrs |= RTA_IFP;
    su = &so_dst;
    su->sin6.sin6_family = AF_INET6;
#ifdef HAVE_SA_LEN
    su->sin6.sin6_len = sizeof(struct sockaddr_in6);
#endif
    su->sin6.sin6_addr = source->sin6_addr;
    su->sin6.sin6_scope_id = source->sin6_scope_id;
    so_ifp.sa.sa_family = AF_LINK;
#ifdef HAVE_SA_LEN
    so_ifp.sa.sa_len = sizeof(struct sockaddr_dl);
#endif
    flags |= RTF_UP;
    flags |= RTF_HOST;
    flags |= RTF_GATEWAY;
    errno = 0;
    bzero((char *)&m_rtmsg, sizeof(m_rtmsg));

#define rtm m_rtmsg.m_rtm
    rtm.rtm_type	= RTM_GET;
    rtm.rtm_flags	= flags;
    rtm.rtm_version	= RTM_VERSION;
    rtm.rtm_seq 	= ++seq;
    rtm.rtm_addrs	= rtm_addrs;
    rtm.rtm_rmx 	= rt_metrics;
    rtm.rtm_inits	= rtm_inits;

    NEXTADDR(RTA_DST, so_dst);
    NEXTADDR(RTA_IFP, so_ifp);
    rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
    
    if ((rlen = write(routing_socket, (char *)&m_rtmsg, l)) < 0) {
	IF_DEBUG(DEBUG_RPF | DEBUG_KERN) {
	    if (errno == ESRCH)
		log(LOG_DEBUG, 0,
		    "Writing to routing socket: no such route\n");
	    else
		log(LOG_DEBUG, 0, "Error writing to routing socket");
	}
	return(FALSE); 
    }
    
    do {
	l = read(routing_socket, (char *)&m_rtmsg, sizeof(m_rtmsg));
    } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid));
    
    if (l < 0) {
	IF_DEBUG(DEBUG_RPF | DEBUG_KERN)
	    log(LOG_DEBUG, 0, "Read from routing socket failed: %s", strerror(errno));
	return(FALSE);
    }
    
    if (getmsg(&rtm, l, &rpfinfo)){
	rpfp->rpfneighbor = rpfinfo.rpfneighbor;
	rpfp->iif = rpfinfo.iif;
    }
#undef rtm
    return (TRUE);
}


/*
 * Returns TRUE on success, FALSE otherwise. rpfinfo contains the result.
 */
int 
getmsg(rtm, msglen, rpfinfop)
    register struct rt_msghdr *rtm;
    int msglen;
    struct rpfctl *rpfinfop;
{
    struct sockaddr *dst = NULL, *gate = NULL, *mask = NULL;
    struct sockaddr_dl *ifp = NULL;
    register struct sockaddr *sa;
    register char *cp;
    register int i;
    struct sockaddr_in6 *sin6;
    vifi_t vifi;
    struct uvif *v;
    char in6txt[INET6_ADDRSTRLEN];
    
    if (rpfinfop == (struct rpfctl *)NULL)
	return(FALSE);
    
    sin6 = (struct sockaddr_in6 *)&so_dst;
    IF_DEBUG(DEBUG_RPF)
	log(LOG_DEBUG, 0, "route to: %s",
	    inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
    cp = ((char *)(rtm + 1));
    if (rtm->rtm_addrs)
	for (i = 1; i; i <<= 1)
	    if (i & rtm->rtm_addrs) {
		sa = (struct sockaddr *)cp;
		switch (i) {
		case RTA_DST:
		    dst = sa;
		    break;
		case RTA_GATEWAY:
		    gate = sa;
		    break;
		case RTA_NETMASK:
		    mask = sa;
		    break;
		case RTA_IFP:
		    if (sa->sa_family == AF_LINK &&
			((struct sockaddr_dl *)sa)->sdl_nlen)
			ifp = (struct sockaddr_dl *)sa;
		    break;
		}
		ADVANCE(cp, sa);
	    }
    
    if (!ifp){ 	/* No incoming interface */
	IF_DEBUG(DEBUG_RPF)
	    log(LOG_DEBUG, 0,
		"No incoming interface for destination %s",
		inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
	return(FALSE);
    }
    if (dst && mask)
	mask->sa_family = dst->sa_family;
    if (dst) {
	sin6 = (struct sockaddr_in6 *)dst;
	IF_DEBUG(DEBUG_RPF)
	    log(LOG_DEBUG, 0, " destination is: %s",
		inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
    }
    if (gate && rtm->rtm_flags & RTF_GATEWAY) {
	sin6 = (struct sockaddr_in6 *)gate;
	IF_DEBUG(DEBUG_RPF)
	    log(LOG_DEBUG, 0, " gateway is: %s",
		inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
	rpfinfop->rpfneighbor = *sin6;

	if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
#if 0
		rpfinfop->rpfneighbor.sin6_scope_id =
			ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
#endif
		rpfinfop->rpfneighbor.sin6_scope_id = ifp->sdl_index;
		/*
		 * XXX: KAME kernel embeds the interface index to the address.
		 * Clear the index for safety.
		 */
		rpfinfop->rpfneighbor.sin6_addr.s6_addr[2] = 0;
		rpfinfop->rpfneighbor.sin6_addr.s6_addr[3] = 0;
	}
    }
    
    for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) 
	/* get the number of the interface by matching the name */
	if ((strlen(v->uv_name) == ifp->sdl_nlen) &&
	    !(strncmp(v->uv_name,ifp->sdl_data,ifp->sdl_nlen)))
	    break;
    
    IF_DEBUG(DEBUG_RPF)
	log(LOG_DEBUG, 0, " iif is %d", vifi);
    
    rpfinfop->iif = vifi;
    
    if (vifi >= numvifs){
	IF_DEBUG(DEBUG_RPF)
	    log(LOG_DEBUG, 0,
		"Invalid incoming interface for destination %s, because of invalid virtual interface",
		inet_ntop(AF_INET6, &sin6->sin6_addr, in6txt, INET6_ADDRSTRLEN));
	return(FALSE);/* invalid iif */
    }
    
    return(TRUE);
}


#else	/* HAVE_ROUTING_SOCKETS */


/*
 * Return in rpfcinfo the incoming interface and the next hop router
 * toward source.
 */
/* TODO: check whether next hop router address is in network or host order */
int
k_req_incoming(source, rpfcinfo)
    struct sockaddr_in6 *source;
    struct rpfctl *rpfcinfo;
{
    rpfcinfo->source = *source;
    rpfcinfo->iif = NO_VIF;     /* just initialized, will be */
    /* changed in kernel */
    memset(&rpfcinfo->rpfneighbor, 0, sizeof(rpfcinfo->rpfneighbor));  /* initialized */
    
    if (ioctl(udp_socket, SIOCGETRPF, (char *) rpfcinfo) < 0){
	log(LOG_ERR, errno, "ioctl SIOCGETRPF k_req_incoming");
	return(FALSE);
    }
    return (TRUE);
}

#endif	/* HAVE_ROUTING_SOCKETS */

OpenPOWER on IntegriCloud