/* $NetBSD: npf_impl.h,v 1.3 2010/09/25 01:42:39 matt Exp $ */ /*- * Copyright (c) 2009-2010 The NetBSD Foundation, Inc. * All rights reserved. * * This material is based upon work partially supported by The * NetBSD Foundation under a contract with Mindaugas Rasiukevicius. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``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 FOUNDATION OR CONTRIBUTORS * 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. */ /* * Private NPF structures and interfaces. * For internal use within NPF core only. */ #ifndef _NPF_IMPL_H_ #define _NPF_IMPL_H_ #include #include #include #include #include #include "npf.h" #include "npf_ncode.h" #ifdef _NPF_TESTING #include "testing.h" #endif /* * STRUCTURE DECLARATIONS. * * Note: ruleset interface declarations are public. */ struct npf_nat; struct npf_session; typedef struct npf_nat npf_nat_t; typedef struct npf_alg npf_alg_t; typedef struct npf_natpolicy npf_natpolicy_t; typedef struct npf_session npf_session_t; struct npf_tblent; struct npf_table; typedef struct npf_tblent npf_tblent_t; typedef struct npf_table npf_table_t; typedef npf_table_t * npf_tableset_t; /* * DEFINITIONS. */ typedef bool (*npf_algfunc_t)(npf_cache_t *, void *, void *); #define NPF_NCODE_LIMIT 1024 #define NPF_TABLE_SLOTS 32 /* * INTERFACES. */ /* NPF control. */ int npfctl_switch(void *); int npfctl_reload(u_long, void *); int npfctl_table(void *); /* Packet filter hooks. */ int npf_register_pfil(void); void npf_unregister_pfil(void); /* Protocol helpers. */ bool npf_ip4_proto(npf_cache_t *, nbuf_t *, void *); bool npf_fetch_ip4addrs(npf_cache_t *, nbuf_t *, void *); bool npf_fetch_ports(npf_cache_t *, nbuf_t *, void *, const int); bool npf_fetch_tcpfl(npf_cache_t *, nbuf_t *, void *); bool npf_fetch_icmp(npf_cache_t *, nbuf_t *, void *); bool npf_cache_all(npf_cache_t *, nbuf_t *); bool npf_rwrport(npf_cache_t *, nbuf_t *, void *, const int, in_port_t, in_addr_t); bool npf_rwrip(npf_cache_t *, nbuf_t *, void *, const int, in_addr_t); uint16_t npf_fixup16_cksum(uint16_t, uint16_t, uint16_t); uint16_t npf_fixup32_cksum(uint16_t, uint32_t, uint32_t); void npf_return_block(npf_cache_t *, nbuf_t *, const int); /* Complex instructions. */ int npf_match_ether(nbuf_t *, int, int, uint16_t, uint32_t *); int npf_match_ip4table(npf_cache_t *, nbuf_t *, void *, const int, const u_int); int npf_match_ip4mask(npf_cache_t *, nbuf_t *, void *, const int, in_addr_t, in_addr_t); int npf_match_tcp_ports(npf_cache_t *, nbuf_t *, void *, const int, const uint32_t); int npf_match_udp_ports(npf_cache_t *, nbuf_t *, void *, const int, const uint32_t); int npf_match_icmp4(npf_cache_t *, nbuf_t *, void *, const uint32_t); int npf_match_tcpfl(npf_cache_t *, nbuf_t *, void *, const uint32_t); /* Tableset interface. */ int npf_tableset_sysinit(void); void npf_tableset_sysfini(void); npf_tableset_t *npf_tableset_create(void); void npf_tableset_destroy(npf_tableset_t *); int npf_tableset_insert(npf_tableset_t *, npf_table_t *); npf_tableset_t *npf_tableset_reload(npf_tableset_t *); npf_table_t * npf_table_create(u_int, int, size_t); void npf_table_destroy(npf_table_t *); void npf_table_ref(npf_table_t *); void npf_table_unref(npf_table_t *); npf_table_t * npf_table_get(npf_tableset_t *, u_int); void npf_table_put(npf_table_t *); int npf_table_check(npf_tableset_t *, u_int, int); int npf_table_add_v4cidr(npf_tableset_t *, u_int, in_addr_t, in_addr_t); int npf_table_rem_v4cidr(npf_tableset_t *, u_int, in_addr_t, in_addr_t); int npf_table_match_v4addr(u_int, in_addr_t); /* Ruleset interface. */ int npf_ruleset_sysinit(void); void npf_ruleset_sysfini(void); npf_ruleset_t * npf_ruleset_create(void); void npf_ruleset_destroy(npf_ruleset_t *); void npf_ruleset_insert(npf_ruleset_t *, npf_rule_t *); void npf_ruleset_reload(npf_ruleset_t *, npf_tableset_t *); npf_rule_t * npf_ruleset_match(npf_ruleset_t *, npf_cache_t *, nbuf_t *, struct ifnet *, const int, const int); npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *, struct ifnet *, const int, const int); int npf_rule_apply(const npf_cache_t *, npf_rule_t *, bool *, int *); npf_ruleset_t * npf_rule_subset(npf_rule_t *); npf_natpolicy_t *npf_rule_getnat(const npf_rule_t *); void npf_rule_setnat(npf_rule_t *, npf_natpolicy_t *); /* State handling interface. */ int npf_session_sysinit(void); void npf_session_sysfini(void); int npf_session_tracking(bool); npf_session_t * npf_session_inspect(npf_cache_t *, nbuf_t *, struct ifnet *, const int); npf_session_t * npf_session_establish(const npf_cache_t *, npf_nat_t *, const int); void npf_session_release(npf_session_t *); bool npf_session_pass(const npf_session_t *); void npf_session_setpass(npf_session_t *); void npf_session_link(npf_session_t *, npf_session_t *); npf_nat_t * npf_session_retnat(npf_session_t *, const int, bool *); /* NAT. */ void npf_nat_sysinit(void); void npf_nat_sysfini(void); npf_natpolicy_t *npf_nat_newpolicy(int, int, in_addr_t, in_port_t); void npf_nat_freepolicy(npf_natpolicy_t *); void npf_nat_flush(void); void npf_nat_reload(npf_ruleset_t *); int npf_do_nat(npf_cache_t *, npf_session_t *, nbuf_t *, struct ifnet *, const int); void npf_nat_expire(npf_nat_t *); void npf_nat_getorig(npf_nat_t *, in_addr_t *, in_port_t *); void npf_nat_setalg(npf_nat_t *, npf_alg_t *, uintptr_t); /* ALG interface. */ void npf_alg_sysinit(void); void npf_alg_sysfini(void); npf_alg_t * npf_alg_register(npf_algfunc_t, npf_algfunc_t, npf_algfunc_t, npf_algfunc_t); int npf_alg_unregister(npf_alg_t *); void npf_alg_match(npf_cache_t *, nbuf_t *, npf_nat_t *); void npf_alg_exec(npf_cache_t *, nbuf_t *, npf_nat_t *, const int ); bool npf_alg_sessionid(npf_cache_t *, nbuf_t *, npf_cache_t *); /* Debugging routines. */ void npf_rulenc_dump(npf_rule_t *); void npf_sessions_dump(void); void npf_nat_dump(npf_nat_t *); #endif