mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
134ea22494
o revamp IPv4+IPv6+bridge usage to match API changes o remove pfil_head instances from protosw entries (no longer used) o add locking o bump FreeBSD version for 3rd party modules Heavy lifting by: "Max Laier" <max@love2party.net> Supported by: FreeBSD Foundation Obtained from: NetBSD (bits of pfil.h and pfil.c)
113 lines
3.6 KiB
C
113 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/_lock.h>
|
|
#include <sys/_mutex.h>
|
|
#include <sys/condvar.h> /* XXX */
|
|
#include <sys/queue.h>
|
|
|
|
struct mbuf;
|
|
struct ifnet;
|
|
|
|
/*
|
|
* 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);
|
|
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;
|
|
/*
|
|
* Locking: use a busycounter per pfil_head.
|
|
* Use ph_busy_count = -1 to indicate pfil_head is empty.
|
|
*/
|
|
int ph_busy_count; /* count of threads with read lock */
|
|
int ph_want_write; /* want write lock flag */
|
|
struct cv ph_cv; /* for waking up writers */
|
|
struct mtx ph_mtx; /* mutex on locking state */
|
|
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);
|
|
|
|
int pfil_add_hook(int (*func)(void *, struct mbuf **,
|
|
struct ifnet *, int), void *, int, struct pfil_head *);
|
|
int pfil_remove_hook(int (*func)(void *, struct mbuf **,
|
|
struct ifnet *, int), 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);
|
|
|
|
static __inline struct packet_filter_hook *
|
|
pfil_hook_get(int dir, struct pfil_head *ph)
|
|
{
|
|
KASSERT(ph->ph_busy_count > 0,
|
|
("pfil_hook_get: called on unbusy pfil_head"));
|
|
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_ */
|