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NetBSD/sys/net/npf/npf_impl.h

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/* $NetBSD: npf_impl.h,v 1.22 2012/08/15 19:47:38 rmind Exp $ */
/*-
* Copyright (c) 2009-2012 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_
#if !defined(_KERNEL)
#error "Kernel-level header only"
#endif
#ifdef _KERNEL_OPT
/* For INET/INET6 definitions. */
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/hash.h>
#include <sys/rbtree.h>
#include <sys/ptree.h>
#include <sys/rwlock.h>
#include <net/if.h>
#include "npf.h"
#include "npf_ncode.h"
#ifdef _NPF_DEBUG
#define NPF_PRINTF(x) printf x
#else
#define NPF_PRINTF(x)
#endif
/*
* STRUCTURE DECLARATIONS.
*/
struct npf_ruleset;
struct npf_rule;
struct npf_nat;
struct npf_session;
typedef struct npf_ruleset npf_ruleset_t;
typedef struct npf_rule npf_rule_t;
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_sehash;
struct npf_tblent;
struct npf_table;
typedef struct npf_sehash npf_sehash_t;
typedef struct npf_tblent npf_tblent_t;
typedef struct npf_table npf_table_t;
typedef npf_table_t * npf_tableset_t;
/*
* DEFINITIONS.
*/
#define NPF_DECISION_BLOCK 0
#define NPF_DECISION_PASS 1
typedef bool (*npf_algfunc_t)(npf_cache_t *, nbuf_t *, void *);
#define NPF_NCODE_LIMIT 1024
#define NPF_TABLE_SLOTS 32
/*
* SESSION STATE STRUCTURES
*/
#define NPF_FLOW_FORW 0
#define NPF_FLOW_BACK 1
typedef struct {
uint32_t nst_end;
uint32_t nst_maxend;
uint32_t nst_maxwin;
int nst_wscale;
} npf_tcpstate_t;
typedef struct {
kmutex_t nst_lock;
int nst_state;
npf_tcpstate_t nst_tcpst[2];
} npf_state_t;
/*
* INTERFACES.
*/
/* NPF control, statistics, etc. */
void npf_core_enter(void);
npf_ruleset_t * npf_core_ruleset(void);
npf_ruleset_t * npf_core_natset(void);
npf_tableset_t *npf_core_tableset(void);
void npf_core_exit(void);
bool npf_core_locked(void);
bool npf_default_pass(void);
prop_dictionary_t npf_core_dict(void);
void npf_reload(prop_dictionary_t, npf_ruleset_t *,
npf_tableset_t *, npf_ruleset_t *, bool);
void npflogattach(int);
void npflogdetach(void);
int npfctl_switch(void *);
int npfctl_reload(u_long, void *);
int npfctl_getconf(u_long, void *);
int npfctl_sessions_save(u_long, void *);
int npfctl_sessions_load(u_long, void *);
int npfctl_update_rule(u_long, void *);
int npfctl_table(void *);
void npf_stats_inc(npf_stats_t);
void npf_stats_dec(npf_stats_t);
/* Packet filter hooks. */
int npf_pfil_register(void);
void npf_pfil_unregister(void);
bool npf_pfil_registered_p(void);
int npf_packet_handler(void *, struct mbuf **, ifnet_t *, int);
void npf_log_packet(npf_cache_t *, nbuf_t *, int);
/* Protocol helpers. */
bool npf_fetch_ip(npf_cache_t *, nbuf_t *, void *);
bool npf_fetch_tcp(npf_cache_t *, nbuf_t *, void *);
bool npf_fetch_udp(npf_cache_t *, nbuf_t *, void *);
bool npf_fetch_icmp(npf_cache_t *, nbuf_t *, void *);
int npf_cache_all(npf_cache_t *, nbuf_t *);
bool npf_rwrip(npf_cache_t *, nbuf_t *, void *, const int,
npf_addr_t *);
bool npf_rwrport(npf_cache_t *, nbuf_t *, void *, const int,
in_port_t);
bool npf_rwrcksum(npf_cache_t *, nbuf_t *, void *, const int,
npf_addr_t *, in_port_t);
uint16_t npf_fixup16_cksum(uint16_t, uint16_t, uint16_t);
uint16_t npf_fixup32_cksum(uint16_t, uint32_t, uint32_t);
uint16_t npf_addr_cksum(uint16_t, int, npf_addr_t *, npf_addr_t *);
uint32_t npf_addr_sum(const int, const npf_addr_t *, const npf_addr_t *);
int npf_addr_cmp(const npf_addr_t *, const npf_netmask_t,
const npf_addr_t *, const npf_netmask_t, const int);
void npf_addr_mask(const npf_addr_t *, const npf_netmask_t,
const int, npf_addr_t *);
int npf_tcpsaw(const npf_cache_t *, tcp_seq *, tcp_seq *,
uint32_t *);
bool npf_fetch_tcpopts(const npf_cache_t *, nbuf_t *,
uint16_t *, int *);
bool npf_normalize(npf_cache_t *, nbuf_t *, bool, bool, u_int, u_int);
bool 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_proto(npf_cache_t *, nbuf_t *, void *, uint32_t);
int npf_match_table(npf_cache_t *, nbuf_t *, void *,
const int, const u_int);
int npf_match_ipmask(npf_cache_t *, nbuf_t *, void *,
const int, const npf_addr_t *, const npf_netmask_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 *, uint32_t);
int npf_match_icmp6(npf_cache_t *, nbuf_t *, void *, uint32_t);
int npf_match_tcpfl(npf_cache_t *, nbuf_t *, void *, uint32_t);
/* Tableset interface. */
void npf_tableset_sysinit(void);
void npf_tableset_sysfini(void);
extern const pt_tree_ops_t npf_table_ptree_ops;
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(const npf_tableset_t *, u_int, int);
int npf_table_insert(npf_tableset_t *, u_int,
const int, const npf_addr_t *, const npf_netmask_t);
int npf_table_remove(npf_tableset_t *, u_int,
const int, const npf_addr_t *, const npf_netmask_t);
int npf_table_lookup(npf_tableset_t *, u_int,
const int, const npf_addr_t *);
/* Ruleset interface. */
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_natreload(npf_ruleset_t *, npf_ruleset_t *);
npf_rule_t * npf_ruleset_matchnat(npf_ruleset_t *, npf_natpolicy_t *);
npf_rule_t * npf_ruleset_sharepm(npf_ruleset_t *, npf_natpolicy_t *);
npf_rule_t * npf_ruleset_replace(const char *, npf_ruleset_t *);
void npf_ruleset_freealg(npf_ruleset_t *, npf_alg_t *);
npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *, npf_ruleset_t *,
const ifnet_t *, const int, const int);
int npf_rule_apply(npf_cache_t *, nbuf_t *, npf_rule_t *, int *);
/* Rule interface. */
npf_rule_t * npf_rule_alloc(prop_dictionary_t, npf_rproc_t *, void *, size_t);
void npf_rule_free(npf_rule_t *);
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 *);
npf_rproc_t * npf_rule_getrproc(npf_rule_t *);
npf_rproc_t * npf_rproc_create(prop_dictionary_t);
void npf_rproc_acquire(npf_rproc_t *);
void npf_rproc_release(npf_rproc_t *);
void npf_rproc_run(npf_cache_t *, nbuf_t *, npf_rproc_t *, int);
/* Session handling interface. */
void npf_session_sysinit(void);
void npf_session_sysfini(void);
int npf_session_tracking(bool);
npf_sehash_t * sess_htable_create(void);
void sess_htable_destroy(npf_sehash_t *);
void sess_htable_reload(npf_sehash_t *);
npf_session_t * npf_session_inspect(npf_cache_t *, nbuf_t *,
const ifnet_t *, const int, int *);
npf_session_t * npf_session_establish(const npf_cache_t *, nbuf_t *,
const ifnet_t *, const int);
void npf_session_release(npf_session_t *);
void npf_session_expire(npf_session_t *);
bool npf_session_pass(const npf_session_t *, npf_rproc_t **);
void npf_session_setpass(npf_session_t *, npf_rproc_t *);
int npf_session_setnat(npf_session_t *, npf_nat_t *, const int);
npf_nat_t * npf_session_retnat(npf_session_t *, const int, bool *);
int npf_session_save(prop_array_t, prop_array_t);
int npf_session_restore(npf_sehash_t *, prop_dictionary_t);
/* State handling. */
bool npf_state_init(const npf_cache_t *, nbuf_t *, npf_state_t *);
bool npf_state_inspect(const npf_cache_t *, nbuf_t *, npf_state_t *,
const bool);
int npf_state_etime(const npf_state_t *, const int);
void npf_state_destroy(npf_state_t *);
bool npf_state_tcp(const npf_cache_t *, nbuf_t *, npf_state_t *, int);
int npf_state_tcp_timeout(const npf_state_t *);
/* NAT. */
void npf_nat_sysinit(void);
void npf_nat_sysfini(void);
npf_natpolicy_t *npf_nat_newpolicy(prop_dictionary_t, npf_ruleset_t *);
void npf_nat_freepolicy(npf_natpolicy_t *);
bool npf_nat_matchpolicy(npf_natpolicy_t *, npf_natpolicy_t *);
bool npf_nat_sharepm(npf_natpolicy_t *, npf_natpolicy_t *);
void npf_nat_freealg(npf_natpolicy_t *, npf_alg_t *);
int npf_do_nat(npf_cache_t *, npf_session_t *, nbuf_t *,
const ifnet_t *, const int);
void npf_nat_expire(npf_nat_t *);
void npf_nat_getorig(npf_nat_t *, npf_addr_t **, in_port_t *);
void npf_nat_gettrans(npf_nat_t *, npf_addr_t **, in_port_t *);
void npf_nat_setalg(npf_nat_t *, npf_alg_t *, uintptr_t);
int npf_nat_save(prop_dictionary_t, prop_array_t, npf_nat_t *);
npf_nat_t * npf_nat_restore(prop_dictionary_t, npf_session_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 *);
bool 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_addr_dump(const npf_addr_t *);
void npf_rulenc_dump(const npf_rule_t *);
void npf_sessions_dump(void);
void npf_state_dump(const npf_state_t *);
void npf_nat_dump(const npf_nat_t *);
void npf_state_setsampler(void (*)(npf_state_t *, bool));
#endif /* _NPF_IMPL_H_ */
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