Function imo_match_source

freebsd/netinet/in_mcast.c:444–459

* Find an IPv4 multicast source entry for this imo which matches * the given group index for this socket, and source address. * * NOTE: This does not check if the entry is in-mode, merely if * it exists, which may not be the desired behaviour. */

 * it exists, which may not be the desired behaviour.
 */
static struct in_msource *
imo_match_source(struct in_mfilter *imf, const struct sockaddr *src)
{
	struct ip_msource	 find;
	struct ip_msource	*ims;
	const sockunion_t	*psa;

	KASSERT(src->sa_family == AF_INET, ("%s: !AF_INET", __func__));

	/* Source trees are keyed in host byte order. */
	psa = (const sockunion_t *)src;
	find.ims_haddr = ntohl(psa->sin.sin_addr.s_addr);
	ims = RB_FIND(ip_msource_tree, &imf->imf_sources, &find);

	return ((struct in_msource *)ims);
}

/*
 * Perform filtering for multicast datagrams on a socket by group and source.