Function im6o_match_group

freebsd/netinet6/in6_mcast.c:258–279

* Find an IPv6 multicast group entry for this ip6_moptions instance * which matches the specified group, and optionally an interface. * Return its index into the array, or -1 if not found. */

 * Return its index into the array, or -1 if not found.
 */
static struct in6_mfilter *
im6o_match_group(const struct ip6_moptions *imo, const struct ifnet *ifp,
    const struct sockaddr *group)
{
	const struct sockaddr_in6 *gsin6;
        struct in6_mfilter *imf;
        struct in6_multi *inm;

        gsin6 = (const struct sockaddr_in6 *)group;

	IP6_MFILTER_FOREACH(imf, &imo->im6o_head) {
		inm = imf->im6f_in6m;
		if (inm == NULL)
			continue;
		if ((ifp == NULL || (inm->in6m_ifp == ifp)) &&
		    IN6_ARE_ADDR_EQUAL(&inm->in6m_addr,
		    &gsin6->sin6_addr)) {
			break;
		}
	}
	return (imf);
}

/*
 * Find an IPv6 multicast source entry for this imo which matches