604afec496
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
114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
/* $FreeBSD$ */
|
|
/* $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/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;
|
|
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);
|
|
|
|
#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_ */
|