freebsd-dev/sys/net/pfil.h

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/* $FreeBSD$ */
/* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
/*-
* Copyright (c) 1996 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef _NET_PFIL_H_
#define _NET_PFIL_H_
#include <sys/systm.h>
#include <sys/queue.h>
#include <sys/_lock.h>
#include <sys/_mutex.h>
#include <sys/lock.h>
Somewhat re-factor the read/write locking mechanism associated with the packet filtering mechanisms to use the new rwlock(9) locking API: - Drop the variables stored in the phil_head structure which were specific to conditions and the home rolled read/write locking mechanism. - Drop some includes which were used for condition variables - Drop the inline functions, and convert them to macros. Also, move these macros into pfil.h - Move pfil list locking macros intp phil.h as well - Rename ph_busy_count to ph_nhooks. This variable will represent the number of IN/OUT hooks registered with the pfil head structure - Define PFIL_HOOKED macro which evaluates to true if there are any hooks to be ran by pfil_run_hooks - In the IP/IP6 stacks, change the ph_busy_count comparison to use the new PFIL_HOOKED macro. - Drop optimization in pfil_run_hooks which checks to see if there are any hooks to be ran, and returns if not. This check is already performed by the IP stacks when they call: if (!PFIL_HOOKED(ph)) goto skip_hooks; - Drop in assertion which makes sure that the number of hooks never drops below 0 for good measure. This in theory should never happen, and if it does than there are problems somewhere - Drop special logic around PFIL_WAITOK because rw_wlock(9) does not sleep - Drop variables which support home rolled read/write locking mechanism from the IPFW firewall chain structure. - Swap out the read/write firewall chain lock internal to use the rwlock(9) API instead of our home rolled version - Convert the inlined functions to macros Reviewed by: mlaier, andre, glebius Thanks to: jhb for the new locking API
2006-02-02 03:13:16 +00:00
#include <sys/rwlock.h>
struct mbuf;
struct ifnet;
struct inpcb;
/*
* The packet filter hooks are designed for anything to call them to
* possibly intercept the packet.
*/
struct packet_filter_hook {
TAILQ_ENTRY(packet_filter_hook) pfil_link;
int (*pfil_func)(void *, struct mbuf **, struct ifnet *, int, struct inpcb *);
void *pfil_arg;
int pfil_flags;
};
#define PFIL_IN 0x00000001
#define PFIL_OUT 0x00000002
#define PFIL_WAITOK 0x00000004
#define PFIL_ALL (PFIL_IN|PFIL_OUT)
typedef TAILQ_HEAD(pfil_list, packet_filter_hook) pfil_list_t;
#define PFIL_TYPE_AF 1 /* key is AF_* type */
#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
struct pfil_head {
pfil_list_t ph_in;
pfil_list_t ph_out;
int ph_type;
Somewhat re-factor the read/write locking mechanism associated with the packet filtering mechanisms to use the new rwlock(9) locking API: - Drop the variables stored in the phil_head structure which were specific to conditions and the home rolled read/write locking mechanism. - Drop some includes which were used for condition variables - Drop the inline functions, and convert them to macros. Also, move these macros into pfil.h - Move pfil list locking macros intp phil.h as well - Rename ph_busy_count to ph_nhooks. This variable will represent the number of IN/OUT hooks registered with the pfil head structure - Define PFIL_HOOKED macro which evaluates to true if there are any hooks to be ran by pfil_run_hooks - In the IP/IP6 stacks, change the ph_busy_count comparison to use the new PFIL_HOOKED macro. - Drop optimization in pfil_run_hooks which checks to see if there are any hooks to be ran, and returns if not. This check is already performed by the IP stacks when they call: if (!PFIL_HOOKED(ph)) goto skip_hooks; - Drop in assertion which makes sure that the number of hooks never drops below 0 for good measure. This in theory should never happen, and if it does than there are problems somewhere - Drop special logic around PFIL_WAITOK because rw_wlock(9) does not sleep - Drop variables which support home rolled read/write locking mechanism from the IPFW firewall chain structure. - Swap out the read/write firewall chain lock internal to use the rwlock(9) API instead of our home rolled version - Convert the inlined functions to macros Reviewed by: mlaier, andre, glebius Thanks to: jhb for the new locking API
2006-02-02 03:13:16 +00:00
int ph_nhooks;
struct rwlock ph_mtx;
union {
u_long phu_val;
void *phu_ptr;
} ph_un;
#define ph_af ph_un.phu_val
#define ph_ifnet ph_un.phu_ptr
LIST_ENTRY(pfil_head) ph_list;
};
int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
int, struct inpcb *inp);
int pfil_add_hook(int (*func)(void *, struct mbuf **,
struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *);
int pfil_remove_hook(int (*func)(void *, struct mbuf **,
struct ifnet *, int, struct inpcb *), void *, int, struct pfil_head *);
int pfil_head_register(struct pfil_head *);
int pfil_head_unregister(struct pfil_head *);
struct pfil_head *pfil_head_get(int, u_long);
Somewhat re-factor the read/write locking mechanism associated with the packet filtering mechanisms to use the new rwlock(9) locking API: - Drop the variables stored in the phil_head structure which were specific to conditions and the home rolled read/write locking mechanism. - Drop some includes which were used for condition variables - Drop the inline functions, and convert them to macros. Also, move these macros into pfil.h - Move pfil list locking macros intp phil.h as well - Rename ph_busy_count to ph_nhooks. This variable will represent the number of IN/OUT hooks registered with the pfil head structure - Define PFIL_HOOKED macro which evaluates to true if there are any hooks to be ran by pfil_run_hooks - In the IP/IP6 stacks, change the ph_busy_count comparison to use the new PFIL_HOOKED macro. - Drop optimization in pfil_run_hooks which checks to see if there are any hooks to be ran, and returns if not. This check is already performed by the IP stacks when they call: if (!PFIL_HOOKED(ph)) goto skip_hooks; - Drop in assertion which makes sure that the number of hooks never drops below 0 for good measure. This in theory should never happen, and if it does than there are problems somewhere - Drop special logic around PFIL_WAITOK because rw_wlock(9) does not sleep - Drop variables which support home rolled read/write locking mechanism from the IPFW firewall chain structure. - Swap out the read/write firewall chain lock internal to use the rwlock(9) API instead of our home rolled version - Convert the inlined functions to macros Reviewed by: mlaier, andre, glebius Thanks to: jhb for the new locking API
2006-02-02 03:13:16 +00:00
#define PFIL_HOOKED(p) (&(p)->ph_nhooks > 0)
#define PFIL_RLOCK(p) rw_rlock(&(p)->ph_mtx)
#define PFIL_WLOCK(p) rw_wlock(&(p)->ph_mtx)
#define PFIL_RUNLOCK(p) rw_runlock(&(p)->ph_mtx)
#define PFIL_WUNLOCK(p) rw_wunlock(&(p)->ph_mtx)
#define PFIL_LIST_LOCK() mtx_lock(&pfil_global_lock)
#define PFIL_LIST_UNLOCK() mtx_unlock(&pfil_global_lock)
static __inline struct packet_filter_hook *
pfil_hook_get(int dir, struct pfil_head *ph)
{
if (dir == PFIL_IN)
return (TAILQ_FIRST(&ph->ph_in));
else if (dir == PFIL_OUT)
return (TAILQ_FIRST(&ph->ph_out));
else
return (NULL);
}
#endif /* _NET_PFIL_H_ */