250  * pfil_head_register() registers a pfil_head with the packet filter hook
282  * pfil_head_unregister() removes a pfil_head from the packet filter hook
283  * mechanism.  The producer of the hook promises that all outstanding
284  * invocations of the hook have completed before it unregisters the hook.
309 	struct pfil_hook *hook, *list;  in pfil_add_hook()  local
313 	hook = malloc(sizeof(struct pfil_hook), M_PFIL, M_WAITOK | M_ZERO);  in pfil_add_hook()
314 	hook->hook_mbuf_chk = pa->pa_mbuf_chk;  in pfil_add_hook()
315 	hook->hook_mem_chk = pa->pa_mem_chk;  in pfil_add_hook()
316 	hook->hook_ruleset = pa->pa_ruleset;  in pfil_add_hook()
317 	hook->hook_flags = pa->pa_flags;  in pfil_add_hook()
318 	hook->hook_type = pa->pa_type;  in pfil_add_hook()
319 	hook->hook_modname = pa->pa_modname;  in pfil_add_hook()
320 	hook->hook_rulname = pa->pa_rulname;  in pfil_add_hook()
326 			printf("pfil: duplicate hook \"%s:%s\"\n",  in pfil_add_hook()
329 	LIST_INSERT_HEAD(&V_pfil_hook_list, hook, hook_list);  in pfil_add_hook()
332 	return (hook);  in pfil_add_hook()
336 pfil_unlink(struct pfil_link_args *pa, pfil_head_t head, pfil_hook_t hook)  in pfil_unlink()  argument
343 		in = pfil_link_remove(&head->head_in, hook);  in pfil_unlink()
346 			hook->hook_links--;  in pfil_unlink()
351 		out = pfil_link_remove(&head->head_out, hook);  in pfil_unlink()
354 			hook->hook_links--;  in pfil_unlink()
376 	struct pfil_hook *hook;  in pfil_link()  local
398 		hook = pa->pa_hook;  in pfil_link()
400 		LIST_FOREACH(hook, &V_pfil_hook_list, hook_list)  in pfil_link()
401 			if (strcmp(pa->pa_modname, hook->hook_modname) == 0 &&  in pfil_link()
402 			    strcmp(pa->pa_rulname, hook->hook_rulname) == 0)  in pfil_link()
404 	if (head == NULL || hook == NULL) {  in pfil_link()
410 		return (pfil_unlink(pa, head, hook));  in pfil_link()
412 	if (head->head_type != hook->hook_type ||  in pfil_link()
413 	    ((hook->hook_flags & pa->pa_flags) & ~head->head_flags)) {  in pfil_link()
420 			if (link->link_hook == hook) {  in pfil_link()
426 			if (link->link_hook == hook) {  in pfil_link()
432 		in->link_hook = hook;  in pfil_link()
433 		in->link_mbuf_chk = hook->hook_mbuf_chk;  in pfil_link()
434 		in->link_mem_chk = hook->hook_mem_chk;  in pfil_link()
435 		in->link_flags = hook->hook_flags;  in pfil_link()
436 		in->link_ruleset = hook->hook_ruleset;  in pfil_link()
441 		hook->hook_links++;  in pfil_link()
445 		out->link_hook = hook;  in pfil_link()
446 		out->link_mbuf_chk = hook->hook_mbuf_chk;  in pfil_link()
447 		out->link_mem_chk = hook->hook_mem_chk;  in pfil_link()
448 		out->link_flags = hook->hook_flags;  in pfil_link()
449 		out->link_ruleset = hook->hook_ruleset;  in pfil_link()
454 		hook->hook_links++;  in pfil_link()
481 pfil_remove_hook(pfil_hook_t hook)  in pfil_remove_hook()  argument
489 		in = pfil_link_remove(&head->head_in, hook);  in pfil_remove_hook()
492 			hook->hook_links--;  in pfil_remove_hook()
495 		out = pfil_link_remove(&head->head_out, hook);  in pfil_remove_hook()
498 			hook->hook_links--;  in pfil_remove_hook()
505 	LIST_REMOVE(hook, hook_list);  in pfil_remove_hook()
507 	MPASS(hook->hook_links == 0);  in pfil_remove_hook()
508 	free(hook, M_PFIL);  in pfil_remove_hook()
512  * Internal: Remove a pfil hook from a hook chain.
515 pfil_link_remove(pfil_chain_t *chain, pfil_hook_t hook)  in pfil_link_remove()  argument
522 		if (link->link_hook == hook) {  in pfil_link_remove()
667 	struct pfil_hook *hook;  in pfilioc_listhooks()  local
675 	LIST_FOREACH(hook, &V_pfil_hook_list, hook_list)  in pfilioc_listhooks()
688 	LIST_FOREACH(hook, &V_pfil_hook_list, hook_list) {  in pfilioc_listhooks()
694 		strlcpy(iohook[hk].pio_module, hook->hook_modname,  in pfilioc_listhooks()
696 		strlcpy(iohook[hk].pio_ruleset, hook->hook_rulname,  in pfilioc_listhooks()
698 		iohook[hk].pio_type = hook->hook_type;  in pfilioc_listhooks()
699 		iohook[hk].pio_flags = hook->hook_flags;  in pfilioc_listhooks()