Function encap_register_srcaddr

freebsd/netinet/ip_encap.c:185–213

EVENTHANDLER_DEFINE(ifaddr_event_ext, srcaddr_change_event, NULL, 0);

static struct srcaddrtab *
encap_register_srcaddr(struct srcaddrtab_head *head, encap_srcaddr_t func,
    void *arg, int mflags)
{
	struct srcaddrtab *p, *tmp;

	if (func == NULL)
		return (NULL);
	p = malloc(sizeof(*p), M_NETADDR, mflags);
	if (p == NULL)
		return (NULL);
	p->srcaddr = func;
	p->arg = arg;

	SRCADDR_WLOCK();
	CK_LIST_FOREACH(tmp, head, chain) {
		if (func == tmp->srcaddr && arg == tmp->arg)
			break;
	}
	if (tmp == NULL)
		CK_LIST_INSERT_HEAD(head, p, chain);
	SRCADDR_WUNLOCK();

	if (tmp != NULL) {
		free(p, M_NETADDR);
		p = tmp;
	}
	return (p);
}

static int
encap_unregister_srcaddr(struct srcaddrtab_head *head,