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84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
/*
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* BIRD Internet Routing Daemon -- NetBSD Multicasting and Network Includes
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*
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* (c) 2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#ifdef IPV6
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static inline void
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set_inaddr(struct in6_addr * ia, ip_addr a)
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{
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ipa_hton(a);
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memcpy(ia, &a, sizeof(a));
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}
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#else
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#include <net/if.h>
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static inline void
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set_inaddr(struct in_addr * ia, ip_addr a)
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{
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ipa_hton(a);
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memcpy(&ia->s_addr, &a, sizeof(a));
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}
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static inline char *
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sysio_mcast_setup(sock * s)
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{
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u8 zero = 0;
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u8 one = 1;
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if (ipa_nonzero(s->daddr)) {
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if (setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &zero, sizeof(zero)) < 0) {
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log("IP_MULTICAST_LOOP");
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return "IP_MULTICAST_LOOP";
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}
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if (setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_TTL, &one, sizeof(one)) < 0) {
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log("IP_MULTICAST_TTL");
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return "IP_MULTICAST_TTL";
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}
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}
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return NULL;
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}
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static inline char *
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sysio_mcast_join(sock * s)
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{
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struct in_addr m;
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struct ip_mreq mreq;
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char *err;
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set_inaddr(&m, s->iface->addr->ip );
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memset(&mreq, 0, sizeof(mreq));
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set_inaddr(&mreq.imr_interface, s->iface->addr->ip);
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set_inaddr(&mreq.imr_multiaddr, s->daddr);
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/* And this one sets interface for _receiving_ multicasts from */
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if (ipa_nonzero(s->daddr) && setsockopt(s->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
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log("IP_ADD_MEMBERSHIP");
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return "IP_ADD_MEMBERSHIP";
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}
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/* This defines where should we send _outgoing_ multicasts */
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if (ipa_nonzero(s->daddr) && setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_IF, &m, sizeof(m)) < 0) {
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log("IP_MULTICAST_IF");
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return "IP_MULTICAST_IF";
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}
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if (err = sysio_mcast_setup(s))
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return err;
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return NULL;
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}
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#endif
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