Function inp_findmoptions

freebsd/netinet/in_mcast.c:1599–1626

* Given an inpcb, return its multicast options structure pointer. Accepts * an unlocked inpcb pointer, but will return it locked. May sleep. * * SMPng: NOTE: Potentially calls malloc(M_WAITOK) with Giant held. * SMPng: NOTE: Returns with the INP write lock held. */

 * SMPng: NOTE: Returns with the INP write lock held.
 */
static struct ip_moptions *
inp_findmoptions(struct inpcb *inp)
{
	struct ip_moptions	 *imo;

	INP_WLOCK(inp);
	if (inp->inp_moptions != NULL)
		return (inp->inp_moptions);

	INP_WUNLOCK(inp);

	imo = malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK);

	imo->imo_multicast_ifp = NULL;
	imo->imo_multicast_addr.s_addr = INADDR_ANY;
	imo->imo_multicast_vif = -1;
	imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
	imo->imo_multicast_loop = in_mcast_loop;
	STAILQ_INIT(&imo->imo_head);

	INP_WLOCK(inp);
	if (inp->inp_moptions != NULL) {
		free(imo, M_IPMOPTS);
		return (inp->inp_moptions);
	}
	inp->inp_moptions = imo;
	return (imo);
}

static void
inp_gcmoptions(struct ip_moptions *imo)