214 lines
7.1 KiB
C
214 lines
7.1 KiB
C
/* $NetBSD: npf_impl.h,v 1.3 2010/09/25 01:42:39 matt Exp $ */
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/*-
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* Copyright (c) 2009-2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This material is based upon work partially supported by The
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* NetBSD Foundation under a contract with Mindaugas Rasiukevicius.
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Private NPF structures and interfaces.
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* For internal use within NPF core only.
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*/
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#ifndef _NPF_IMPL_H_
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#define _NPF_IMPL_H_
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#include <sys/rbtree.h>
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#include <sys/hash.h>
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#include <sys/queue.h>
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#include <sys/types.h>
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#include <sys/rwlock.h>
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#include "npf.h"
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#include "npf_ncode.h"
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#ifdef _NPF_TESTING
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#include "testing.h"
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#endif
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/*
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* STRUCTURE DECLARATIONS.
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*
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* Note: ruleset interface declarations are public.
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*/
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struct npf_nat;
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struct npf_session;
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typedef struct npf_nat npf_nat_t;
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typedef struct npf_alg npf_alg_t;
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typedef struct npf_natpolicy npf_natpolicy_t;
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typedef struct npf_session npf_session_t;
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struct npf_tblent;
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struct npf_table;
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typedef struct npf_tblent npf_tblent_t;
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typedef struct npf_table npf_table_t;
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typedef npf_table_t * npf_tableset_t;
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/*
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* DEFINITIONS.
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*/
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typedef bool (*npf_algfunc_t)(npf_cache_t *, void *, void *);
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#define NPF_NCODE_LIMIT 1024
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#define NPF_TABLE_SLOTS 32
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/*
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* INTERFACES.
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*/
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/* NPF control. */
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int npfctl_switch(void *);
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int npfctl_reload(u_long, void *);
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int npfctl_table(void *);
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/* Packet filter hooks. */
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int npf_register_pfil(void);
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void npf_unregister_pfil(void);
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/* Protocol helpers. */
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bool npf_ip4_proto(npf_cache_t *, nbuf_t *, void *);
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bool npf_fetch_ip4addrs(npf_cache_t *, nbuf_t *, void *);
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bool npf_fetch_ports(npf_cache_t *, nbuf_t *, void *, const int);
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bool npf_fetch_tcpfl(npf_cache_t *, nbuf_t *, void *);
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bool npf_fetch_icmp(npf_cache_t *, nbuf_t *, void *);
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bool npf_cache_all(npf_cache_t *, nbuf_t *);
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bool npf_rwrport(npf_cache_t *, nbuf_t *, void *, const int,
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in_port_t, in_addr_t);
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bool npf_rwrip(npf_cache_t *, nbuf_t *, void *, const int, in_addr_t);
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uint16_t npf_fixup16_cksum(uint16_t, uint16_t, uint16_t);
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uint16_t npf_fixup32_cksum(uint16_t, uint32_t, uint32_t);
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void npf_return_block(npf_cache_t *, nbuf_t *, const int);
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/* Complex instructions. */
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int npf_match_ether(nbuf_t *, int, int, uint16_t, uint32_t *);
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int npf_match_ip4table(npf_cache_t *, nbuf_t *, void *,
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const int, const u_int);
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int npf_match_ip4mask(npf_cache_t *, nbuf_t *, void *,
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const int, in_addr_t, in_addr_t);
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int npf_match_tcp_ports(npf_cache_t *, nbuf_t *, void *,
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const int, const uint32_t);
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int npf_match_udp_ports(npf_cache_t *, nbuf_t *, void *,
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const int, const uint32_t);
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int npf_match_icmp4(npf_cache_t *, nbuf_t *, void *, const uint32_t);
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int npf_match_tcpfl(npf_cache_t *, nbuf_t *, void *, const uint32_t);
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/* Tableset interface. */
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int npf_tableset_sysinit(void);
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void npf_tableset_sysfini(void);
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npf_tableset_t *npf_tableset_create(void);
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void npf_tableset_destroy(npf_tableset_t *);
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int npf_tableset_insert(npf_tableset_t *, npf_table_t *);
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npf_tableset_t *npf_tableset_reload(npf_tableset_t *);
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npf_table_t * npf_table_create(u_int, int, size_t);
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void npf_table_destroy(npf_table_t *);
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void npf_table_ref(npf_table_t *);
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void npf_table_unref(npf_table_t *);
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npf_table_t * npf_table_get(npf_tableset_t *, u_int);
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void npf_table_put(npf_table_t *);
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int npf_table_check(npf_tableset_t *, u_int, int);
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int npf_table_add_v4cidr(npf_tableset_t *, u_int,
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in_addr_t, in_addr_t);
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int npf_table_rem_v4cidr(npf_tableset_t *, u_int,
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in_addr_t, in_addr_t);
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int npf_table_match_v4addr(u_int, in_addr_t);
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/* Ruleset interface. */
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int npf_ruleset_sysinit(void);
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void npf_ruleset_sysfini(void);
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npf_ruleset_t * npf_ruleset_create(void);
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void npf_ruleset_destroy(npf_ruleset_t *);
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void npf_ruleset_insert(npf_ruleset_t *, npf_rule_t *);
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void npf_ruleset_reload(npf_ruleset_t *, npf_tableset_t *);
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npf_rule_t * npf_ruleset_match(npf_ruleset_t *, npf_cache_t *, nbuf_t *,
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struct ifnet *, const int, const int);
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npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *,
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struct ifnet *, const int, const int);
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int npf_rule_apply(const npf_cache_t *, npf_rule_t *, bool *, int *);
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npf_ruleset_t * npf_rule_subset(npf_rule_t *);
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npf_natpolicy_t *npf_rule_getnat(const npf_rule_t *);
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void npf_rule_setnat(npf_rule_t *, npf_natpolicy_t *);
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/* State handling interface. */
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int npf_session_sysinit(void);
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void npf_session_sysfini(void);
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int npf_session_tracking(bool);
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npf_session_t * npf_session_inspect(npf_cache_t *, nbuf_t *,
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struct ifnet *, const int);
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npf_session_t * npf_session_establish(const npf_cache_t *,
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npf_nat_t *, const int);
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void npf_session_release(npf_session_t *);
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bool npf_session_pass(const npf_session_t *);
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void npf_session_setpass(npf_session_t *);
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void npf_session_link(npf_session_t *, npf_session_t *);
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npf_nat_t * npf_session_retnat(npf_session_t *, const int, bool *);
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/* NAT. */
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void npf_nat_sysinit(void);
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void npf_nat_sysfini(void);
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npf_natpolicy_t *npf_nat_newpolicy(int, int, in_addr_t, in_port_t);
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void npf_nat_freepolicy(npf_natpolicy_t *);
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void npf_nat_flush(void);
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void npf_nat_reload(npf_ruleset_t *);
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int npf_do_nat(npf_cache_t *, npf_session_t *, nbuf_t *,
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struct ifnet *, const int);
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void npf_nat_expire(npf_nat_t *);
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void npf_nat_getorig(npf_nat_t *, in_addr_t *, in_port_t *);
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void npf_nat_setalg(npf_nat_t *, npf_alg_t *, uintptr_t);
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/* ALG interface. */
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void npf_alg_sysinit(void);
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void npf_alg_sysfini(void);
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npf_alg_t * npf_alg_register(npf_algfunc_t, npf_algfunc_t,
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npf_algfunc_t, npf_algfunc_t);
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int npf_alg_unregister(npf_alg_t *);
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void npf_alg_match(npf_cache_t *, nbuf_t *, npf_nat_t *);
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void npf_alg_exec(npf_cache_t *, nbuf_t *, npf_nat_t *, const int );
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bool npf_alg_sessionid(npf_cache_t *, nbuf_t *, npf_cache_t *);
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/* Debugging routines. */
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void npf_rulenc_dump(npf_rule_t *);
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void npf_sessions_dump(void);
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void npf_nat_dump(npf_nat_t *);
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#endif
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