fe267a5590
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. No functional change intended.
126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: pfil.h,v 1.22 2003/06/23 12:57:08 martin Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1996 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _NET_PFIL_H_
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#define _NET_PFIL_H_
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#include <sys/systm.h>
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <net/vnet.h>
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struct mbuf;
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struct ifnet;
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struct inpcb;
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typedef int (*pfil_func_t)(void *, struct mbuf **, struct ifnet *, int,
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struct inpcb *);
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/*
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* The packet filter hooks are designed for anything to call them to
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* possibly intercept the packet. Multiple filter hooks are chained
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* together and after each other in the specified order.
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*/
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struct packet_filter_hook {
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TAILQ_ENTRY(packet_filter_hook) pfil_chain;
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pfil_func_t pfil_func;
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void *pfil_arg;
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};
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#define PFIL_IN 0x00000001
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#define PFIL_OUT 0x00000002
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#define PFIL_WAITOK 0x00000004
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#define PFIL_ALL (PFIL_IN|PFIL_OUT)
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typedef TAILQ_HEAD(pfil_chain, packet_filter_hook) pfil_chain_t;
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#define PFIL_TYPE_AF 1 /* key is AF_* type */
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#define PFIL_TYPE_IFNET 2 /* key is ifnet pointer */
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#define PFIL_FLAG_PRIVATE_LOCK 0x01 /* Personal lock instead of global */
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/*
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* A pfil head is created by each protocol or packet intercept point.
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* For packet is then run through the hook chain for inspection.
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*/
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struct pfil_head {
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pfil_chain_t ph_in;
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pfil_chain_t ph_out;
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int ph_type;
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int ph_nhooks;
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#if defined( __linux__ ) || defined( _WIN32 )
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rwlock_t ph_mtx;
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#else
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struct rmlock *ph_plock; /* Pointer to the used lock */
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struct rmlock ph_lock; /* Private lock storage */
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int flags;
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#endif
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union {
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u_long phu_val;
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void *phu_ptr;
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} ph_un;
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#define ph_af ph_un.phu_val
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#define ph_ifnet ph_un.phu_ptr
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LIST_ENTRY(pfil_head) ph_list;
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};
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VNET_DECLARE(struct rmlock, pfil_lock);
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#define V_pfil_lock VNET(pfil_lock)
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/* Public functions for pfil hook management by packet filters. */
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struct pfil_head *pfil_head_get(int, u_long);
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int pfil_add_hook(pfil_func_t, void *, int, struct pfil_head *);
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int pfil_remove_hook(pfil_func_t, void *, int, struct pfil_head *);
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#define PFIL_HOOKED(p) ((p)->ph_nhooks > 0)
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/* Public functions to run the packet inspection by protocols. */
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int pfil_run_hooks(struct pfil_head *, struct mbuf **, struct ifnet *,
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int, struct inpcb *inp);
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/* Public functions for pfil head management by protocols. */
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int pfil_head_register(struct pfil_head *);
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int pfil_head_unregister(struct pfil_head *);
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/* Public pfil locking functions for self managed locks by packet filters. */
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int pfil_try_rlock(struct pfil_head *, struct rm_priotracker *);
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void pfil_rlock(struct pfil_head *, struct rm_priotracker *);
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void pfil_runlock(struct pfil_head *, struct rm_priotracker *);
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void pfil_wlock(struct pfil_head *);
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void pfil_wunlock(struct pfil_head *);
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int pfil_wowned(struct pfil_head *ph);
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#endif /* _NET_PFIL_H_ */
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