pfil.h revision 139823
1120386Ssam/* $FreeBSD: head/sys/net/pfil.h 139823 2005-01-07 01:45:51Z imp $ */ 2120386Ssam/* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */ 360317Sdarrenr 4139823Simp/*- 560317Sdarrenr * Copyright (c) 1996 Matthew R. Green 660317Sdarrenr * All rights reserved. 760317Sdarrenr * 860317Sdarrenr * Redistribution and use in source and binary forms, with or without 960317Sdarrenr * modification, are permitted provided that the following conditions 1060317Sdarrenr * are met: 1160317Sdarrenr * 1. Redistributions of source code must retain the above copyright 1260317Sdarrenr * notice, this list of conditions and the following disclaimer. 1360317Sdarrenr * 2. Redistributions in binary form must reproduce the above copyright 1460317Sdarrenr * notice, this list of conditions and the following disclaimer in the 1560317Sdarrenr * documentation and/or other materials provided with the distribution. 1660317Sdarrenr * 3. The name of the author may not be used to endorse or promote products 1760317Sdarrenr * derived from this software without specific prior written permission. 1860317Sdarrenr * 1960317Sdarrenr * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 2060317Sdarrenr * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 2160317Sdarrenr * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 2260317Sdarrenr * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 2360317Sdarrenr * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 2460317Sdarrenr * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 2560317Sdarrenr * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 2660317Sdarrenr * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 2760317Sdarrenr * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2860317Sdarrenr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2960317Sdarrenr * SUCH DAMAGE. 3060317Sdarrenr */ 3160317Sdarrenr 3260317Sdarrenr#ifndef _NET_PFIL_H_ 3360317Sdarrenr#define _NET_PFIL_H_ 3460317Sdarrenr 35120386Ssam#include <sys/systm.h> 36130731Sbde#include <sys/queue.h> 37120386Ssam#include <sys/_lock.h> 38120386Ssam#include <sys/_mutex.h> 39120386Ssam#include <sys/condvar.h> /* XXX */ 4060317Sdarrenr 4160317Sdarrenrstruct mbuf; 4260317Sdarrenrstruct ifnet; 43135920Smlaierstruct inpcb; 4460317Sdarrenr 4560317Sdarrenr/* 4660317Sdarrenr * The packet filter hooks are designed for anything to call them to 4760317Sdarrenr * possibly intercept the packet. 4860317Sdarrenr */ 4960317Sdarrenrstruct packet_filter_hook { 5060938Sjake TAILQ_ENTRY(packet_filter_hook) pfil_link; 51135920Smlaier int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int, struct inpcb *); 52120386Ssam void *pfil_arg; 5360317Sdarrenr int pfil_flags; 5460317Sdarrenr}; 5560317Sdarrenr 5660317Sdarrenr#define PFIL_IN 0x00000001 5760317Sdarrenr#define PFIL_OUT 0x00000002 5860317Sdarrenr#define PFIL_WAITOK 0x00000004 5960317Sdarrenr#define PFIL_ALL (PFIL_IN|PFIL_OUT) 6060317Sdarrenr 6160938Sjaketypedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t; 6260317Sdarrenr 63120386Ssam#define PFIL_TYPE_AF 1 /* key is AF_* type */ 64120386Ssam#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */ 65120386Ssam 6660317Sdarrenrstruct pfil_head { 6760317Sdarrenr pfil_list_t ph_in; 6860317Sdarrenr pfil_list_t ph_out; 69120386Ssam int ph_type; 70120386Ssam /* 71120386Ssam * Locking: use a busycounter per pfil_head. 72120386Ssam * Use ph_busy_count = -1 to indicate pfil_head is empty. 73120386Ssam */ 74120386Ssam int ph_busy_count; /* count of threads with read lock */ 75120386Ssam int ph_want_write; /* want write lock flag */ 76120386Ssam struct cv ph_cv; /* for waking up writers */ 77120386Ssam struct mtx ph_mtx; /* mutex on locking state */ 78120386Ssam union { 79120386Ssam u_long phu_val; 80120386Ssam void *phu_ptr; 81120386Ssam } ph_un; 82120386Ssam#define ph_af ph_un.phu_val 83120386Ssam#define ph_ifnet ph_un.phu_ptr 84120386Ssam LIST_ENTRY(pfil_head) ph_list; 8585305Sru}; 8660317Sdarrenr 87120386Ssamint pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *, 88135920Smlaier int, struct inpcb *inp); 8960317Sdarrenr 90120386Ssamint pfil_add_hook(int (*func)(void *, struct mbuf **, 91135920Smlaier struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *); 92120386Ssamint pfil_remove_hook(int (*func)(void *, struct mbuf **, 93135920Smlaier struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *); 9460317Sdarrenr 95120386Ssamint pfil_head_register(struct pfil_head *); 96120386Ssamint pfil_head_unregister(struct pfil_head *); 9760317Sdarrenr 98120386Ssamstruct pfil_head *pfil_head_get(int, u_long); 99120386Ssam 100120386Ssamstatic __inline struct packet_filter_hook * 101120386Ssampfil_hook_get(int dir, struct pfil_head *ph) 102120386Ssam{ 103120386Ssam KASSERT(ph->ph_busy_count > 0, 104120386Ssam ("pfil_hook_get: called on unbusy pfil_head")); 105120386Ssam if (dir == PFIL_IN) 106120386Ssam return (TAILQ_FIRST(&ph->ph_in)); 107120386Ssam else if (dir == PFIL_OUT) 108120386Ssam return (TAILQ_FIRST(&ph->ph_out)); 109120386Ssam else 110120386Ssam return (NULL); 111120386Ssam} 112120386Ssam 11360317Sdarrenr#endif /* _NET_PFIL_H_ */ 114