Function in6p_block_unblock_source

freebsd/netinet6/in6_mcast.c:1400–1546

* Block or unblock an ASM multicast source on an inpcb. * This implements the delta-based API described in RFC 3678. * * The delta-based API applies only to exclusive-mode memberships. * An MLD downcall will be performed. * * SMPng: NOTE: Must take Giant as a join may create a new ifma. * * Return 0 if successful, otherwise return an appropriate error code. */

 * Return 0 if successful, otherwise return an appropriate error code.
 */
static int
in6p_block_unblock_source(struct inpcb *inp, struct sockopt *sopt)
{
	struct group_source_req		 gsr;
	sockunion_t			*gsa, *ssa;
	struct ifnet			*ifp;
	struct in6_mfilter		*imf;
	struct ip6_moptions		*imo;
	struct in6_msource		*ims;
	struct in6_multi			*inm;
	uint16_t			 fmode;
	int				 error, doblock;
#ifdef KTR
	char				 ip6tbuf[INET6_ADDRSTRLEN];
#endif

	ifp = NULL;
	error = 0;
	doblock = 0;

	memset(&gsr, 0, sizeof(struct group_source_req));
	gsa = (sockunion_t *)&gsr.gsr_group;
	ssa = (sockunion_t *)&gsr.gsr_source;

	switch (sopt->sopt_name) {
	case MCAST_BLOCK_SOURCE:
	case MCAST_UNBLOCK_SOURCE:
		error = sooptcopyin(sopt, &gsr,
		    sizeof(struct group_source_req),
		    sizeof(struct group_source_req));
		if (error)
			return (error);

		if (gsa->sin6.sin6_family != AF_INET6 ||
		    gsa->sin6.sin6_len != sizeof(struct sockaddr_in6))
			return (EINVAL);

		if (ssa->sin6.sin6_family != AF_INET6 ||
		    ssa->sin6.sin6_len != sizeof(struct sockaddr_in6))
			return (EINVAL);

		if (gsr.gsr_interface == 0 || V_if_index < gsr.gsr_interface)
			return (EADDRNOTAVAIL);

		ifp = ifnet_byindex(gsr.gsr_interface);

		if (sopt->sopt_name == MCAST_BLOCK_SOURCE)
			doblock = 1;
		break;

	default:
		CTR2(KTR_MLD, "%s: unknown sopt_name %d",
		    __func__, sopt->sopt_name);
		return (EOPNOTSUPP);
		break;
	}

	if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr))