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
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
|
/*-
* Copyright (c) 2007 Bruce M. Simpson.
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of Bruce M. Simpson nor the names of other
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY BRUCE M. SIMPSON AND AFFILIATES
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BRUCE M. SIMPSON OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "namespace.h"
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if_dl.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <assert.h>
#include <errno.h>
#include <ifaddrs.h>
#include <stdlib.h>
#include <string.h>
#include "un-namespace.h"
/*
* Advanced (Full-state) multicast group membership APIs [RFC3678]
* Currently this module assumes IPv4 support (INET) in the base system.
*/
#ifndef INET
#define INET
#endif
union sockunion {
struct sockaddr_storage ss;
struct sockaddr sa;
struct sockaddr_dl sdl;
#ifdef INET
struct sockaddr_in sin;
#endif
#ifdef INET6
struct sockaddr_in6 sin6;
#endif
};
typedef union sockunion sockunion_t;
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
/*
* Internal: Map an IPv4 unicast address to an interface index.
* This is quite inefficient so it is recommended applications use
* the newer, more portable, protocol independent API.
*/
static uint32_t
__inaddr_to_index(in_addr_t ifaddr)
{
struct ifaddrs *ifa;
struct ifaddrs *ifaddrs;
char *ifname;
int ifindex;
sockunion_t *psu;
if (getifaddrs(&ifaddrs) < 0)
return (0);
ifindex = 0;
ifname = NULL;
/*
* Pass #1: Find the ifaddr entry corresponding to the
* supplied IPv4 address. We should really use the ifindex
* consistently for matches, however it is not available to
* us on this pass.
*/
for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
psu = (sockunion_t *)ifa->ifa_addr;
if (psu && psu->ss.ss_family == AF_INET &&
psu->sin.sin_addr.s_addr == ifaddr) {
ifname = ifa->ifa_name;
break;
}
}
if (ifname == NULL)
goto out;
/*
* Pass #2: Find the index of the interface matching the name
* we obtained from looking up the IPv4 ifaddr in pass #1.
* There must be a better way of doing this.
*/
for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
psu = (sockunion_t *)ifa->ifa_addr;
if (psu && psu->ss.ss_family == AF_LINK &&
strcmp(ifa->ifa_name, ifname) == 0) {
ifindex = psu->sdl.sdl_index;
break;
}
}
assert(ifindex != 0);
out:
freeifaddrs(ifaddrs);
return (ifindex);
}
/*
* Set IPv4 source filter list in use on socket.
*
* Stubbed to setsourcefilter(). Performs conversion of structures which
* may be inefficient; applications are encouraged to use the
* protocol-independent API.
*/
int
setipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
uint32_t fmode, uint32_t numsrc, struct in_addr *slist)
{
#ifdef INET
sockunion_t tmpgroup;
struct in_addr *pina;
sockunion_t *psu, *tmpslist;
int err;
size_t i;
uint32_t ifindex;
assert(s != -1);
tmpslist = NULL;
if (!IN_MULTICAST(ntohl(group.s_addr)) ||
(fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE)) {
errno = EINVAL;
return (-1);
}
ifindex = __inaddr_to_index(interface.s_addr);
if (ifindex == 0) {
errno = EADDRNOTAVAIL;
return (-1);
}
memset(&tmpgroup, 0, sizeof(sockunion_t));
tmpgroup.sin.sin_family = AF_INET;
tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
tmpgroup.sin.sin_addr = group;
if (numsrc != 0 || slist != NULL) {
tmpslist = calloc(numsrc, sizeof(sockunion_t));
if (tmpslist == NULL) {
errno = ENOMEM;
return (-1);
}
pina = slist;
psu = tmpslist;
for (i = 0; i < numsrc; i++, pina++, psu++) {
psu->sin.sin_family = AF_INET;
psu->sin.sin_len = sizeof(struct sockaddr_in);
psu->sin.sin_addr = *pina;
}
}
err = setsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
sizeof(struct sockaddr_in), fmode, numsrc,
(struct sockaddr_storage *)tmpslist);
if (tmpslist != NULL)
free(tmpslist);
return (err);
#else /* !INET */
return (EAFNOSUPPORT);
#endif /* INET */
}
/*
* Get IPv4 source filter list in use on socket.
*
* Stubbed to getsourcefilter(). Performs conversion of structures which
* may be inefficient; applications are encouraged to use the
* protocol-independent API.
* An slist of NULL may be used for guessing the required buffer size.
*/
int
getipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist)
{
sockunion_t *psu, *tmpslist;
sockunion_t tmpgroup;
struct in_addr *pina;
int err;
size_t i;
uint32_t ifindex, onumsrc;
assert(s != -1);
assert(fmode != NULL);
assert(numsrc != NULL);
onumsrc = *numsrc;
*numsrc = 0;
tmpslist = NULL;
if (!IN_MULTICAST(ntohl(group.s_addr)) ||
(onumsrc != 0 && slist == NULL)) {
errno = EINVAL;
return (-1);
}
ifindex = __inaddr_to_index(interface.s_addr);
if (ifindex == 0) {
errno = EADDRNOTAVAIL;
return (-1);
}
memset(&tmpgroup, 0, sizeof(sockunion_t));
tmpgroup.sin.sin_family = AF_INET;
tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
tmpgroup.sin.sin_addr = group;
if (onumsrc != 0 || slist != NULL) {
tmpslist = calloc(onumsrc, sizeof(sockunion_t));
if (tmpslist == NULL) {
errno = ENOMEM;
return (-1);
}
}
err = getsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
sizeof(struct sockaddr_in), fmode, numsrc,
(struct sockaddr_storage *)tmpslist);
if (tmpslist != NULL && *numsrc != 0) {
pina = slist;
psu = tmpslist;
for (i = 0; i < MIN(onumsrc, *numsrc); i++, psu++) {
if (psu->ss.ss_family != AF_INET)
continue;
*pina++ = psu->sin.sin_addr;
}
free(tmpslist);
}
return (err);
}
/*
* Set protocol-independent source filter list in use on socket.
*/
int
setsourcefilter(int s, uint32_t interface, struct sockaddr *group,
socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
struct sockaddr_storage *slist)
{
struct __msfilterreq msfr;
sockunion_t *psu;
int level, optname;
if (fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE) {
errno = EINVAL;
return (-1);
}
psu = (sockunion_t *)group;
switch (psu->ss.ss_family) {
#ifdef INET
case AF_INET:
if ((grouplen != sizeof(struct sockaddr_in) ||
!IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
errno = EINVAL;
return (-1);
}
level = IPPROTO_IP;
optname = IP_MSFILTER;
break;
#endif
#ifdef INET6
case AF_INET6:
if (grouplen != sizeof(struct sockaddr_in6) ||
!IN6_IS_ADDR_MULTICAST(psu->sin6.sin6_addr)) {
errno = EINVAL;
return (-1);
}
level = IPPROTO_IPV6;
optname = IPV6_MSFILTER;
break;
#endif
default:
errno = EAFNOSUPPORT;
return (-1);
}
memset(&msfr, 0, sizeof(msfr));
msfr.msfr_ifindex = interface;
msfr.msfr_fmode = fmode;
msfr.msfr_nsrcs = numsrc;
memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
msfr.msfr_srcs = slist; /* pointer */
return (setsockopt(s, level, optname, &msfr, sizeof(msfr)));
}
/*
* Get protocol-independent source filter list in use on socket.
* An slist of NULL may be used for guessing the required buffer size.
*/
int
getsourcefilter(int s, uint32_t interface, struct sockaddr *group,
socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc,
struct sockaddr_storage *slist)
{
struct __msfilterreq msfr;
sockunion_t *psu;
int err, level, optlen, optname;
if (interface == 0 || group == NULL || numsrc == NULL ||
fmode == NULL) {
errno = EINVAL;
return (-1);
}
*numsrc = 0;
*fmode = 0;
psu = (sockunion_t *)group;
switch (psu->ss.ss_family) {
#ifdef INET
case AF_INET:
if ((grouplen != sizeof(struct sockaddr_in) ||
!IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
errno = EINVAL;
return (-1);
}
level = IPPROTO_IP;
optname = IP_MSFILTER;
break;
#endif
#ifdef INET6
case AF_INET6:
if (grouplen != sizeof(struct sockaddr_in6) ||
!IN6_IS_ADDR_MULTICAST(psu->sin6.sin6_addr)) {
errno = EINVAL;
return (-1);
}
level = IPPROTO_IPV6;
optname = IPV6_MSFILTER;
break;
#endif
default:
errno = EAFNOSUPPORT;
return (-1);
break;
}
optlen = sizeof(struct __msfilterreq);
memset(&msfr, 0, optlen);
msfr.msfr_ifindex = interface;
msfr.msfr_fmode = 0;
msfr.msfr_nsrcs = *numsrc;
memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
/*
* msfr_srcs is a pointer to a vector of sockaddr_storage. It
* may be NULL. The kernel will always return the total number
* of filter entries for the group in msfr.msfr_nsrcs.
*/
msfr.msfr_srcs = slist;
err = getsockopt(s, level, optname, &msfr, &optlen);
if (err == 0) {
*numsrc = msfr.msfr_nsrcs;
*fmode = msfr.msfr_fmode;
}
return (err);
}
|