Function FindUdpTcpIn

freebsd/netinet/libalias/alias_db.c:1463–1500

}

struct alias_link *
FindUdpTcpIn(struct libalias *la, struct in_addr dst_addr,
    struct in_addr alias_addr,
    u_short dst_port,
    u_short alias_port,
    u_char proto,
    int create)
{
	int link_type;
	struct alias_link *lnk;

	LIBALIAS_LOCK_ASSERT(la);
	switch (proto) {
	case IPPROTO_UDP:
		link_type = LINK_UDP;
		break;
	case IPPROTO_TCP:
		link_type = LINK_TCP;
		break;
	default:
		return (NULL);
		break;
	}

	lnk = FindLinkIn(la, dst_addr, alias_addr,
	    dst_port, alias_port,
	    link_type, create);

	if (lnk == NULL && create && !(la->packetAliasMode & PKT_ALIAS_DENY_INCOMING)) {
		struct in_addr target_addr;

		target_addr = FindOriginalAddress(la, alias_addr);
		lnk = AddLink(la, target_addr, dst_addr, alias_addr,
		    alias_port, dst_port, alias_port,
		    link_type);
	}
	return (lnk);
}

struct alias_link *
FindUdpTcpOut(struct libalias *la, struct in_addr src_addr,