/* $NetBSD: npf_impl.h,v 1.8 2011/11/04 01:00:27 zoltan Exp $ */ /*- * Copyright (c) 2009-2011 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) && !defined(_NPF_TESTING) #error "Kernel-level header only" #endif #include #include #include #include #include #include #include "npf.h" #include "npf_ncode.h" #ifdef _NPF_TESTING #include "testing.h" #endif #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. */ typedef bool (*npf_algfunc_t)(npf_cache_t *, nbuf_t *, void *); #define NPF_NCODE_LIMIT 1024 #define NPF_TABLE_SLOTS 32 /* * SESSION STATE STRUCTURES */ typedef struct { uint32_t nst_seqend; /* SEQ number + length. */ uint32_t nst_ackend; /* ACK sequence number + window. */ uint32_t nst_maxwin; /* Maximum window seen. */ int nst_wscale; /* Window Scale. */ } 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); void npf_reload(npf_ruleset_t *, npf_tableset_t *, npf_ruleset_t *); void npflogattach(int); void npflogdetach(void); int npfctl_switch(void *); int npfctl_reload(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_register_pfil(void); void npf_unregister_pfil(void); 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 *); bool 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_tcpsaw(npf_cache_t *, nbuf_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); 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_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_tcpfl(npf_cache_t *, nbuf_t *, void *, uint32_t); /* Tableset interface. */ void 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_cidr(npf_tableset_t *, u_int, const npf_addr_t *, const npf_netmask_t); int npf_table_rem_cidr(npf_tableset_t *, u_int, const npf_addr_t *, const npf_netmask_t); int npf_table_match_addr(u_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 *); npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *, npf_ruleset_t *, 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_rproc_create(prop_dictionary_t); npf_rproc_t * npf_rproc_return(npf_rule_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 int); npf_session_t * npf_session_establish(const 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 *, 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 *); /* 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 *); int npf_do_nat(npf_cache_t *, npf_session_t *, nbuf_t *, 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_rulenc_dump(npf_rule_t *); void npf_sessions_dump(void); void npf_state_dump(npf_state_t *); void npf_nat_dump(npf_nat_t *); #endif /* _NPF_IMPL_H_ */