Function im6f_prune

freebsd/netinet6/in6_mcast.c:793–807

* Prune a source entry from an existing socket-layer filter set, * maintaining any required invariants and checking allocations. * * The source is marked as being left at t1, it is not freed. * * Return 0 if no error occurred, otherwise return an errno value. */

 * Return 0 if no error occurred, otherwise return an errno value.
 */
static int
im6f_prune(struct in6_mfilter *imf, const struct sockaddr_in6 *psin)
{
	struct ip6_msource	 find;
	struct ip6_msource	*ims;
	struct in6_msource	*lims;

	find.im6s_addr = psin->sin6_addr;
	ims = RB_FIND(ip6_msource_tree, &imf->im6f_sources, &find);
	if (ims == NULL)
		return (ENOENT);
	lims = (struct in6_msource *)ims;
	lims->im6sl_st[1] = MCAST_UNDEFINED;
	return (0);
}

/*
 * Revert socket-layer filter set deltas at t1 to t0 state.