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Explain a bit more what's going on with the multicast setsockopts.

This commit is contained in:
christos 2014-10-12 14:53:46 +00:00
parent 7de3323258
commit 3242dd1614
1 changed files with 7 additions and 2 deletions
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9
tests/net/mcast/t_mcast.c
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@ -1,4 +1,4 @@
/* $NetBSD: t_mcast.c,v 1.2 2014/10/12 13:48:25 christos Exp $ */
/* $NetBSD: t_mcast.c,v 1.3 2014/10/12 14:53:46 christos Exp $ */
/*-
* Copyright (c) 2014 The NetBSD Foundation, Inc.
@ -29,7 +29,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: t_mcast.c,v 1.2 2014/10/12 13:48:25 christos Exp $");
__RCSID("$NetBSD: t_mcast.c,v 1.3 2014/10/12 14:53:46 christos Exp $");
#include <sys/types.h>
#include <sys/socket.h>
@ -90,7 +90,11 @@ addmc(int s, struct addrinfo *ai)
&m4, sizeof(m4));
case AF_INET6:
s6 = (void *)ai->ai_addr;
#if defined(__linux__) || defined(__NetBSD__)
// XXX: Both linux and we do this thing wrong...
// It is just difficult to make the regular IPv6 multicast
// calls to work with mapped addresses because the code is
// not structured properly. MacOS/X works properly.
if (IN6_IS_ADDR_V4MAPPED(&s6->sin6_addr)) {
memcpy(&m4.imr_multiaddr, &s6->sin6_addr.s6_addr[12],
sizeof(m4.imr_multiaddr));
@ -98,6 +102,7 @@ addmc(int s, struct addrinfo *ai)
return setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP,
&m4, sizeof(m4));
}
#endif
assert(sizeof(*s6) == ai->ai_addrlen);
memset(&m6, 0, sizeof(m6));
m6.ipv6mr_interface = 0;