sys/netgraph/ng_tag.c

36  * This node type accepts an arbitrary number of hooks. Each hook can be
37  * configured for an mbuf_tags(9) definition and two hook names: a hook
38  * for matched packets, and a hook for packets, that didn't match. Incoming
40  * out via first hook, and not matched out via second. If corresponding hook
43  * A hook can also have an outgoing tag definition configured, so that
44  * all packets leaving the hook will be unconditionally appended with newly
49  * are unconditionally forwarded to non-matching hook on input.  There is
54  * If compiled with NG_TAG_DEBUG, each hook also keeps statistics about
80  * Per hook private info.
95 	hook_p			hi_match;	/* matching hook pointer */
96 	hook_p			hi_nonmatch;	/* non-matching hook pointer */
123 static int	ng_tag_setdata_in(hook_p hook, const struct ng_tag_hookin *hp);
124 static int	ng_tag_setdata_out(hook_p hook, const struct ng_tag_hookout *hp);
262  * this default structures and initialize thisHook once at hook creation
266 /* Default tag values for a hook that matches nothing. */
268 	{ '\0' },		/* to be filled in at hook creation time */
277 /* Default tag values for a hook that adds nothing */
279 	{ '\0' },		/* to be filled in at hook creation time */
288  * We don't keep any per-node private data - we do it on per-hook basis.
297  * Add a hook.
300 ng_tag_newhook(node_p node, hook_p hook, const char *name)
305 	/* Create hook private structure. */
309 	NG_HOOK_SET_PRIVATE(hook, hip);
312 	 * After M_ZERO both in and out hook pointers are set to NULL,
319 	if ((error = ng_tag_setdata_in(hook, &ng_tag_default_in)) != 0) {
325 	if ((error = ng_tag_setdata_out(hook, &ng_tag_default_out)) != 0) {
331 	 * Set hook name.  This is done only once at hook creation time
332 	 * since hook name can't change, rather than to do it on every
361 			hook_p hook;
368 			/* Find hook. */
369 			if ((hook = ng_findhook(node, hp->thisHook)) == NULL)
373 			if ((error = ng_tag_setdata_in(hook, hp)) != 0)
382 			hook_p hook;
389 			/* Find hook. */
390 			if ((hook = ng_findhook(node, hp->thisHook)) == NULL)
394 			if ((error = ng_tag_setdata_out(hook, hp)) != 0)
402 			hook_p hook;
409 			/* Find hook. */
410 			if ((hook = ng_findhook(node, msg->data)) == NULL)
414 			hp = ((hinfo_p)NG_HOOK_PRIVATE(hook))->in;
426 			hook_p hook;
433 			/* Find hook. */
434 			if ((hook = ng_findhook(node, msg->data)) == NULL)
438 			hp = ((hinfo_p)NG_HOOK_PRIVATE(hook))->out;
453 			hook_p hook;
460 			/* Find hook. */
461 			if ((hook = ng_findhook(node, msg->data)) == NULL)
463 			stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;
496  * Receive data on a hook.
501 ng_tag_rcvdata(hook_p hook, item_p item)
505 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);
532 	 * to find such tag (for example, these are zeroes after hook
547 	/* See if we got a match and find destination hook. */
563 	/* Deliver frame out destination hook. */
608 ng_tag_disconnect(hook_p hook)
610 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);
611 	node_p node = NG_HOOK_NODE(hook);
619 		if (priv->hi_match == hook)
621 		if (priv->hi_nonmatch == hook)
628 	NG_HOOK_SET_PRIVATE(hook, NULL);			/* for good measure */
629 	if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) &&
630 	    (NG_NODE_IS_VALID(NG_HOOK_NODE(hook)))) {
631 		ng_rmnode_self(NG_HOOK_NODE(hook));
641  * Set the IN tag values associated with a hook.
644 ng_tag_setdata_in(hook_p hook, const struct ng_tag_hookin *hp0)
646 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);
662 	 * Resolve hook names to pointers.
668 	 * XXX The drawback is that user can configure a hook to use
671 	 * if the hook already exists, causing node to drop packets and
673 	 * every hook creation with pointers correction, but that involves
678 	hip->hi_match = ng_findhook(NG_HOOK_NODE(hook), hip->in->ifMatch);
679 	hip->hi_nonmatch = ng_findhook(NG_HOOK_NODE(hook), hip->in->ifNotMatch);
691  * Set the OUT tag values associated with a hook.
694 ng_tag_setdata_out(hook_p hook, const struct ng_tag_hookout *hp0)
696 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);