45  * This node type accepts any number of hook connections.  With each hook
46  * is associated a bpf(4) filter program, and two hook names (each possibly
48  * matching packets are delivered out the first named hook (or dropped if
50  * named hook (or dropped if the empty string).
52  * Each hook also keeps statistics about how many packets have matched, etc.
84 /* Per hook private info */
86 	hook_p			hook;  member
109 static int	ng_bpf_setprog(hook_p hook, const struct ng_bpf_hookprog *hp);
216 /* Default BPF program for a hook that matches nothing */
218 	{ '\0' },		/* to be filled in at hook creation time */
242 ng_bpf_addrefs(hook_p hook, void* arg)  in ng_bpf_addrefs()  argument
244 	hinfo_p hip = NG_HOOK_PRIVATE(hook);  in ng_bpf_addrefs()
255 ng_bpf_remrefs(hook_p hook, void* arg)  in ng_bpf_remrefs()  argument
257 	hinfo_p hip = NG_HOOK_PRIVATE(hook);  in ng_bpf_remrefs()
268  * Add a hook
271 ng_bpf_newhook(node_p node, hook_p hook, const char *name)  in ng_bpf_newhook()  argument
276 	/* Create hook private structure */  in ng_bpf_newhook()
280 	hip->hook = hook;  in ng_bpf_newhook()
281 	NG_HOOK_SET_PRIVATE(hook, hip);  in ng_bpf_newhook()
284 	NG_NODE_FOREACH_HOOK(node, ng_bpf_addrefs, hook);  in ng_bpf_newhook()
287 	if ((error = ng_bpf_setprog(hook, &ng_bpf_default_prog)) != 0) {  in ng_bpf_newhook()
289 		NG_HOOK_SET_PRIVATE(hook, NULL);  in ng_bpf_newhook()
293 	/* Set hook name */  in ng_bpf_newhook()
316 			hook_p hook;  in ng_bpf_rcvmsg()  local
324 			/* Find hook */  in ng_bpf_rcvmsg()
325 			if ((hook = ng_findhook(node, hp->thisHook)) == NULL)  in ng_bpf_rcvmsg()
329 			if ((error = ng_bpf_setprog(hook, hp)) != 0)  in ng_bpf_rcvmsg()
337 			hook_p hook;  in ng_bpf_rcvmsg()  local
344 			/* Find hook */  in ng_bpf_rcvmsg()
345 			if ((hook = ng_findhook(node, msg->data)) == NULL)  in ng_bpf_rcvmsg()
349 			hp = ((hinfo_p)NG_HOOK_PRIVATE(hook))->prog;  in ng_bpf_rcvmsg()
364 			hook_p hook;  in ng_bpf_rcvmsg()  local
371 			/* Find hook */  in ng_bpf_rcvmsg()
372 			if ((hook = ng_findhook(node, msg->data)) == NULL)  in ng_bpf_rcvmsg()
374 			stats = &((hinfo_p)NG_HOOK_PRIVATE(hook))->stats;  in ng_bpf_rcvmsg()
407  * Receive data on a hook
412 ng_bpf_rcvdata(hook_p hook, item_p item)  in ng_bpf_rcvdata()  argument
414 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);  in ng_bpf_rcvdata()
425 	/* Update stats on incoming hook. XXX Can we do 64 bits atomically? */  in ng_bpf_rcvdata()
477 	/* See if we got a match and find destination hook */  in ng_bpf_rcvdata()
498 	/* Deliver frame out destination hook */  in ng_bpf_rcvdata()
517  * Hook disconnection
520 ng_bpf_disconnect(hook_p hook)  in ng_bpf_disconnect()  argument
522 	const node_p node = NG_HOOK_NODE(hook);  in ng_bpf_disconnect()
523 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);  in ng_bpf_disconnect()
528 	NG_NODE_FOREACH_HOOK(node, ng_bpf_remrefs, hook);  in ng_bpf_disconnect()
548  * Set the BPF program associated with a hook
551 ng_bpf_setprog(hook_p hook, const struct ng_bpf_hookprog *hp0)  in ng_bpf_setprog()  argument
553 	const hinfo_p hip = NG_HOOK_PRIVATE(hook);  in ng_bpf_setprog()
586 	hip->match = ng_findhook(NG_HOOK_NODE(hook), hip->prog->ifMatch);  in ng_bpf_setprog()
587 	hip->nomatch = ng_findhook(NG_HOOK_NODE(hook), hip->prog->ifNotMatch);  in ng_bpf_setprog()