Function ng_nat_constructor

freebsd/netgraph/ng_nat.c:305–337

#define	NGNAT_ADDR_DEFINED	0x2	/* NGM_NAT_SET_IPADDR happened */

static int
ng_nat_constructor(node_p node)
{
	priv_p priv;

	/* Initialize private descriptor. */
	priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_ZERO);

	/* Init aliasing engine. */
	priv->lib = LibAliasInit(NULL);

	/* Set same ports on. */
	(void )LibAliasSetMode(priv->lib, PKT_ALIAS_SAME_PORTS,
	    PKT_ALIAS_SAME_PORTS);

	/* Init redirects housekeeping. */
	priv->rdrcount = 0;
	priv->nextid = 1;
	priv->dlt = DLT_RAW;
	STAILQ_INIT(&priv->redirhead);

	/* Link structs together. */
	NG_NODE_SET_PRIVATE(node, priv);
	priv->node = node;

	/*
	 * libalias is not thread safe, so our node
	 * must be single threaded.
	 */
	NG_NODE_FORCE_WRITER(node);

	return (0);
}

static int
ng_nat_newhook(node_p node, hook_p hook, const char *name)