2 * Copyright (c) 2007-2009 Bruce Simpson.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include "namespace.h"
32 #include <sys/param.h>
33 #include <sys/ioctl.h>
34 #include <sys/socket.h>
36 #include <net/if_dl.h>
38 #include <netinet/in.h>
39 #include <netinet/in_systm.h>
40 #include <netinet/ip.h>
41 #include <netinet/ip_var.h>
49 #include "un-namespace.h"
52 * Advanced (Full-state) multicast group membership APIs [RFC3678]
53 * Currently this module assumes IPv4 support (INET) in the base system.
60 struct sockaddr_storage ss;
62 struct sockaddr_dl sdl;
64 struct sockaddr_in sin;
67 struct sockaddr_in6 sin6;
70 typedef union sockunion sockunion_t;
73 #define MIN(a, b) ((a) < (b) ? (a) : (b))
77 * Internal: Map an IPv4 unicast address to an interface index.
78 * This is quite inefficient so it is recommended applications use
79 * the newer, more portable, protocol independent API.
82 __inaddr_to_index(in_addr_t ifaddr)
85 struct ifaddrs *ifaddrs;
90 if (getifaddrs(&ifaddrs) < 0)
97 * Pass #1: Find the ifaddr entry corresponding to the
98 * supplied IPv4 address. We should really use the ifindex
99 * consistently for matches, however it is not available to
102 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
103 psu = (sockunion_t *)ifa->ifa_addr;
104 if (psu && psu->ss.ss_family == AF_INET &&
105 psu->sin.sin_addr.s_addr == ifaddr) {
106 ifname = ifa->ifa_name;
114 * Pass #2: Find the index of the interface matching the name
115 * we obtained from looking up the IPv4 ifaddr in pass #1.
116 * There must be a better way of doing this.
118 for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
119 psu = (sockunion_t *)ifa->ifa_addr;
120 if (psu && psu->ss.ss_family == AF_LINK &&
121 strcmp(ifa->ifa_name, ifname) == 0) {
122 ifindex = LLINDEX(&psu->sdl);
126 assert(ifindex != 0);
129 freeifaddrs(ifaddrs);
134 * Set IPv4 source filter list in use on socket.
136 * Stubbed to setsourcefilter(). Performs conversion of structures which
137 * may be inefficient; applications are encouraged to use the
138 * protocol-independent API.
141 setipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
142 uint32_t fmode, uint32_t numsrc, struct in_addr *slist)
145 sockunion_t tmpgroup;
146 struct in_addr *pina;
147 sockunion_t *psu, *tmpslist;
156 if (!IN_MULTICAST(ntohl(group.s_addr)) ||
157 (fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE)) {
162 ifindex = __inaddr_to_index(interface.s_addr);
164 errno = EADDRNOTAVAIL;
168 memset(&tmpgroup, 0, sizeof(sockunion_t));
169 tmpgroup.sin.sin_family = AF_INET;
170 tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
171 tmpgroup.sin.sin_addr = group;
173 if (numsrc != 0 || slist != NULL) {
174 tmpslist = calloc(numsrc, sizeof(sockunion_t));
175 if (tmpslist == NULL) {
182 for (i = 0; i < numsrc; i++, pina++, psu++) {
183 psu->sin.sin_family = AF_INET;
184 psu->sin.sin_len = sizeof(struct sockaddr_in);
185 psu->sin.sin_addr = *pina;
189 err = setsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
190 sizeof(struct sockaddr_in), fmode, numsrc,
191 (struct sockaddr_storage *)tmpslist);
193 if (tmpslist != NULL)
198 return (EAFNOSUPPORT);
203 * Get IPv4 source filter list in use on socket.
205 * Stubbed to getsourcefilter(). Performs conversion of structures which
206 * may be inefficient; applications are encouraged to use the
207 * protocol-independent API.
208 * An slist of NULL may be used for guessing the required buffer size.
211 getipv4sourcefilter(int s, struct in_addr interface, struct in_addr group,
212 uint32_t *fmode, uint32_t *numsrc, struct in_addr *slist)
214 sockunion_t *psu, *tmpslist;
215 sockunion_t tmpgroup;
216 struct in_addr *pina;
219 uint32_t ifindex, onumsrc;
222 assert(fmode != NULL);
223 assert(numsrc != NULL);
229 if (!IN_MULTICAST(ntohl(group.s_addr)) ||
230 (onumsrc != 0 && slist == NULL)) {
235 ifindex = __inaddr_to_index(interface.s_addr);
237 errno = EADDRNOTAVAIL;
241 memset(&tmpgroup, 0, sizeof(sockunion_t));
242 tmpgroup.sin.sin_family = AF_INET;
243 tmpgroup.sin.sin_len = sizeof(struct sockaddr_in);
244 tmpgroup.sin.sin_addr = group;
246 if (onumsrc != 0 || slist != NULL) {
247 tmpslist = calloc(onumsrc, sizeof(sockunion_t));
248 if (tmpslist == NULL) {
254 err = getsourcefilter(s, ifindex, (struct sockaddr *)&tmpgroup,
255 sizeof(struct sockaddr_in), fmode, numsrc,
256 (struct sockaddr_storage *)tmpslist);
258 if (tmpslist != NULL && *numsrc != 0) {
261 for (i = 0; i < MIN(onumsrc, *numsrc); i++, psu++) {
262 if (psu->ss.ss_family != AF_INET)
264 *pina++ = psu->sin.sin_addr;
273 * Set protocol-independent source filter list in use on socket.
276 setsourcefilter(int s, uint32_t interface, struct sockaddr *group,
277 socklen_t grouplen, uint32_t fmode, uint32_t numsrc,
278 struct sockaddr_storage *slist)
280 struct __msfilterreq msfr;
284 if (fmode != MCAST_INCLUDE && fmode != MCAST_EXCLUDE) {
289 psu = (sockunion_t *)group;
290 switch (psu->ss.ss_family) {
293 if ((grouplen != sizeof(struct sockaddr_in) ||
294 !IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
299 optname = IP_MSFILTER;
304 if (grouplen != sizeof(struct sockaddr_in6) ||
305 !IN6_IS_ADDR_MULTICAST(&psu->sin6.sin6_addr)) {
309 level = IPPROTO_IPV6;
310 optname = IPV6_MSFILTER;
314 errno = EAFNOSUPPORT;
318 memset(&msfr, 0, sizeof(msfr));
319 msfr.msfr_ifindex = interface;
320 msfr.msfr_fmode = fmode;
321 msfr.msfr_nsrcs = numsrc;
322 memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
323 msfr.msfr_srcs = slist; /* pointer */
325 return (_setsockopt(s, level, optname, &msfr, sizeof(msfr)));
329 * Get protocol-independent source filter list in use on socket.
330 * An slist of NULL may be used for guessing the required buffer size.
333 getsourcefilter(int s, uint32_t interface, struct sockaddr *group,
334 socklen_t grouplen, uint32_t *fmode, uint32_t *numsrc,
335 struct sockaddr_storage *slist)
337 struct __msfilterreq msfr;
340 int err, level, nsrcs, optname;
342 if (interface == 0 || group == NULL || numsrc == NULL ||
352 psu = (sockunion_t *)group;
353 switch (psu->ss.ss_family) {
356 if ((grouplen != sizeof(struct sockaddr_in) ||
357 !IN_MULTICAST(ntohl(psu->sin.sin_addr.s_addr)))) {
362 optname = IP_MSFILTER;
367 if (grouplen != sizeof(struct sockaddr_in6) ||
368 !IN6_IS_ADDR_MULTICAST(&psu->sin6.sin6_addr)) {
372 level = IPPROTO_IPV6;
373 optname = IPV6_MSFILTER;
377 errno = EAFNOSUPPORT;
382 optlen = sizeof(struct __msfilterreq);
383 memset(&msfr, 0, optlen);
384 msfr.msfr_ifindex = interface;
386 msfr.msfr_nsrcs = nsrcs;
387 memcpy(&msfr.msfr_group, &psu->ss, psu->ss.ss_len);
390 * msfr_srcs is a pointer to a vector of sockaddr_storage. It
391 * may be NULL. The kernel will always return the total number
392 * of filter entries for the group in msfr.msfr_nsrcs.
394 msfr.msfr_srcs = slist;
395 err = _getsockopt(s, level, optname, &msfr, &optlen);
397 *numsrc = msfr.msfr_nsrcs;
398 *fmode = msfr.msfr_fmode;