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NetBSD/sys/net/npf/npf_impl.h

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/* $NetBSD: npf_impl.h,v 1.42 2013/11/22 01:24:21 rmind Exp $ */
/*-
* Copyright (c) 2009-2013 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/bpf.h>
#include <net/bpfjit.h>
#include <net/if.h>
#include "npf.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_rprocset;
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_rprocset npf_rprocset_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_table;
struct npf_tableset;
typedef struct npf_sehash npf_sehash_t;
typedef struct npf_table npf_table_t;
typedef struct npf_tableset npf_tableset_t;
/*
* DEFINITIONS.
*/
typedef bool (*npf_alg_func_t)(npf_cache_t *, nbuf_t *, npf_nat_t *, int);
typedef npf_session_t *(*npf_alg_sfunc_t)(npf_cache_t *, nbuf_t *, int);
typedef void (*npf_workfunc_t)(void);
/* Some artificial limits. */
#define NPF_MAX_RULES (1024 * 1024)
#define NPF_MAX_TABLES 128
#define NPF_MAX_RPROCS 128
#define NPF_MAX_IFMAP 64
/*
* 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;
u_int nst_state;
npf_tcpstate_t nst_tcpst[2];
} npf_state_t;
/*
* INTERFACES.
*/
/* NPF config, statistics, etc. */
void npf_config_init(void);
void npf_config_fini(void);
void npf_config_enter(void);
void npf_config_exit(void);
void npf_config_sync(void);
bool npf_config_locked_p(void);
int npf_config_read_enter(void);
void npf_config_read_exit(int);
void npf_config_reload(prop_dictionary_t, npf_ruleset_t *,
npf_tableset_t *, npf_ruleset_t *, npf_rprocset_t *, bool);
npf_ruleset_t * npf_config_ruleset(void);
npf_ruleset_t * npf_config_natset(void);
npf_tableset_t *npf_config_tableset(void);
prop_dictionary_t npf_config_dict(void);
bool npf_default_pass(void);
int npf_worker_sysinit(void);
void npf_worker_sysfini(void);
void npf_worker_signal(void);
void npf_worker_register(npf_workfunc_t);
void npf_worker_unregister(npf_workfunc_t);
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_rule(u_long, void *);
int npfctl_table(void *);
void npf_stats_inc(npf_stats_t);
void npf_stats_dec(npf_stats_t);
u_int npf_ifmap_register(const char *);
void npf_ifmap_flush(void);
void npf_ifmap_attach(ifnet_t *);
void npf_ifmap_detach(ifnet_t *);
u_int npf_ifmap_id(const ifnet_t *);
/* Packet filter hooks. */
int npf_pfil_register(bool);
void npf_pfil_unregister(bool);
bool npf_pfil_registered_p(void);
int npf_packet_handler(void *, struct mbuf **, ifnet_t *, int);
/* Protocol helpers. */
int npf_cache_all(npf_cache_t *, nbuf_t *);
void npf_recache(npf_cache_t *, nbuf_t *);
bool npf_rwrip(const npf_cache_t *, int, const npf_addr_t *);
bool npf_rwrport(const npf_cache_t *, int, const in_port_t);
bool npf_rwrcksum(const npf_cache_t *, const int,
const npf_addr_t *, const 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, const npf_addr_t *,
const npf_addr_t *);
uint32_t npf_addr_mix(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(npf_cache_t *, nbuf_t *, uint16_t *, int *);
bool npf_return_block(npf_cache_t *, nbuf_t *, const int);
/* BPF interface. */
void npf_bpf_sysinit(void);
void npf_bpf_sysfini(void);
int npf_bpf_filter(npf_cache_t *, nbuf_t *,
const void *, bpfjit_func_t);
void * npf_bpf_compile(void *, size_t);
bool npf_bpf_validate(const void *, size_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(u_int);
void npf_tableset_destroy(npf_tableset_t *);
int npf_tableset_insert(npf_tableset_t *, npf_table_t *);
npf_table_t * npf_tableset_getbyname(npf_tableset_t *, const char *);
npf_table_t * npf_tableset_getbyid(npf_tableset_t *, u_int);
void npf_tableset_reload(npf_tableset_t *, npf_tableset_t *);
void npf_tableset_syncdict(const npf_tableset_t *, prop_dictionary_t);
npf_table_t * npf_table_create(const char *, u_int, int, size_t);
void npf_table_destroy(npf_table_t *);
int npf_table_check(npf_tableset_t *, const char *, u_int, int);
int npf_table_insert(npf_table_t *, const int,
const npf_addr_t *, const npf_netmask_t);
int npf_table_remove(npf_table_t *, const int,
const npf_addr_t *, const npf_netmask_t);
int npf_table_lookup(npf_table_t *, const int, const npf_addr_t *);
int npf_table_list(npf_table_t *, void *, size_t);
int npf_table_flush(npf_table_t *);
/* Ruleset interface. */
npf_ruleset_t * npf_ruleset_create(size_t);
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_ruleset_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 *);
void npf_ruleset_freealg(npf_ruleset_t *, npf_alg_t *);
int npf_ruleset_add(npf_ruleset_t *, const char *, npf_rule_t *);
int npf_ruleset_remove(npf_ruleset_t *, const char *, uint64_t);
int npf_ruleset_remkey(npf_ruleset_t *, const char *,
const void *, size_t);
prop_dictionary_t npf_ruleset_list(npf_ruleset_t *, const char *);
int npf_ruleset_flush(npf_ruleset_t *, const char *);
void npf_ruleset_gc(npf_ruleset_t *);
npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *,
const npf_ruleset_t *, const int, const int);
int npf_rule_conclude(const npf_rule_t *, int *);
/* Rule interface. */
npf_rule_t * npf_rule_alloc(prop_dictionary_t);
void npf_rule_setcode(npf_rule_t *, int, void *, size_t);
void npf_rule_setrproc(npf_rule_t *, npf_rproc_t *);
void npf_rule_free(npf_rule_t *);
uint64_t npf_rule_getid(const 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 *);
void npf_ext_sysinit(void);
void npf_ext_sysfini(void);
int npf_ext_construct(const char *,
npf_rproc_t *, prop_dictionary_t);
npf_rprocset_t *npf_rprocset_create(void);
void npf_rprocset_destroy(npf_rprocset_t *);
npf_rproc_t * npf_rprocset_lookup(npf_rprocset_t *, const char *);
void npf_rprocset_insert(npf_rprocset_t *, npf_rproc_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);
void npf_session_tracking(bool);
npf_sehash_t * sess_htable_create(void);
void sess_htable_destroy(npf_sehash_t *);
npf_session_t * npf_session_lookup(const npf_cache_t *, const nbuf_t *,
const int, bool *);
npf_session_t * npf_session_inspect(npf_cache_t *, nbuf_t *, const int, int *);
npf_session_t * npf_session_establish(npf_cache_t *, nbuf_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 *, u_int);
npf_nat_t * npf_session_retnat(npf_session_t *, const int, bool *);
void npf_session_load(npf_sehash_t *);
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(npf_cache_t *, nbuf_t *, npf_state_t *);
bool npf_state_inspect(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(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 int);
int npf_nat_translate(npf_cache_t *, nbuf_t *, npf_nat_t *,
const bool, 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(const char *, npf_alg_func_t, npf_alg_func_t,
npf_alg_sfunc_t);
int npf_alg_unregister(npf_alg_t *);
npf_alg_t * npf_alg_construct(const char *);
bool npf_alg_match(npf_cache_t *, nbuf_t *, npf_nat_t *, int);
void npf_alg_exec(npf_cache_t *, nbuf_t *, npf_nat_t *, int);
npf_session_t * npf_alg_session(npf_cache_t *, nbuf_t *, int);
/* Debugging routines. */
void npf_addr_dump(const npf_addr_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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