npf_impl.h revision 1.22
1 /* $NetBSD: npf_impl.h,v 1.22 2012/08/15 19:47:38 rmind Exp $ */ 2 3 /*- 4 * Copyright (c) 2009-2012 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This material is based upon work partially supported by The 8 * NetBSD Foundation under a contract with Mindaugas Rasiukevicius. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * Private NPF structures and interfaces. 34 * For internal use within NPF core only. 35 */ 36 37 #ifndef _NPF_IMPL_H_ 38 #define _NPF_IMPL_H_ 39 40 #if !defined(_KERNEL) 41 #error "Kernel-level header only" 42 #endif 43 44 #ifdef _KERNEL_OPT 45 /* For INET/INET6 definitions. */ 46 #include "opt_inet.h" 47 #include "opt_inet6.h" 48 #endif 49 50 #include <sys/types.h> 51 #include <sys/queue.h> 52 #include <sys/hash.h> 53 #include <sys/rbtree.h> 54 #include <sys/ptree.h> 55 #include <sys/rwlock.h> 56 #include <net/if.h> 57 58 #include "npf.h" 59 #include "npf_ncode.h" 60 61 #ifdef _NPF_DEBUG 62 #define NPF_PRINTF(x) printf x 63 #else 64 #define NPF_PRINTF(x) 65 #endif 66 67 /* 68 * STRUCTURE DECLARATIONS. 69 */ 70 71 struct npf_ruleset; 72 struct npf_rule; 73 struct npf_nat; 74 struct npf_session; 75 76 typedef struct npf_ruleset npf_ruleset_t; 77 typedef struct npf_rule npf_rule_t; 78 typedef struct npf_nat npf_nat_t; 79 typedef struct npf_alg npf_alg_t; 80 typedef struct npf_natpolicy npf_natpolicy_t; 81 typedef struct npf_session npf_session_t; 82 83 struct npf_sehash; 84 struct npf_tblent; 85 struct npf_table; 86 87 typedef struct npf_sehash npf_sehash_t; 88 typedef struct npf_tblent npf_tblent_t; 89 typedef struct npf_table npf_table_t; 90 91 typedef npf_table_t * npf_tableset_t; 92 93 /* 94 * DEFINITIONS. 95 */ 96 97 #define NPF_DECISION_BLOCK 0 98 #define NPF_DECISION_PASS 1 99 100 typedef bool (*npf_algfunc_t)(npf_cache_t *, nbuf_t *, void *); 101 102 #define NPF_NCODE_LIMIT 1024 103 #define NPF_TABLE_SLOTS 32 104 105 /* 106 * SESSION STATE STRUCTURES 107 */ 108 109 #define NPF_FLOW_FORW 0 110 #define NPF_FLOW_BACK 1 111 112 typedef struct { 113 uint32_t nst_end; 114 uint32_t nst_maxend; 115 uint32_t nst_maxwin; 116 int nst_wscale; 117 } npf_tcpstate_t; 118 119 typedef struct { 120 kmutex_t nst_lock; 121 int nst_state; 122 npf_tcpstate_t nst_tcpst[2]; 123 } npf_state_t; 124 125 /* 126 * INTERFACES. 127 */ 128 129 /* NPF control, statistics, etc. */ 130 void npf_core_enter(void); 131 npf_ruleset_t * npf_core_ruleset(void); 132 npf_ruleset_t * npf_core_natset(void); 133 npf_tableset_t *npf_core_tableset(void); 134 void npf_core_exit(void); 135 bool npf_core_locked(void); 136 bool npf_default_pass(void); 137 prop_dictionary_t npf_core_dict(void); 138 139 void npf_reload(prop_dictionary_t, npf_ruleset_t *, 140 npf_tableset_t *, npf_ruleset_t *, bool); 141 142 void npflogattach(int); 143 void npflogdetach(void); 144 int npfctl_switch(void *); 145 int npfctl_reload(u_long, void *); 146 int npfctl_getconf(u_long, void *); 147 int npfctl_sessions_save(u_long, void *); 148 int npfctl_sessions_load(u_long, void *); 149 int npfctl_update_rule(u_long, void *); 150 int npfctl_table(void *); 151 152 void npf_stats_inc(npf_stats_t); 153 void npf_stats_dec(npf_stats_t); 154 155 /* Packet filter hooks. */ 156 int npf_pfil_register(void); 157 void npf_pfil_unregister(void); 158 bool npf_pfil_registered_p(void); 159 int npf_packet_handler(void *, struct mbuf **, ifnet_t *, int); 160 void npf_log_packet(npf_cache_t *, nbuf_t *, int); 161 162 /* Protocol helpers. */ 163 bool npf_fetch_ip(npf_cache_t *, nbuf_t *, void *); 164 bool npf_fetch_tcp(npf_cache_t *, nbuf_t *, void *); 165 bool npf_fetch_udp(npf_cache_t *, nbuf_t *, void *); 166 bool npf_fetch_icmp(npf_cache_t *, nbuf_t *, void *); 167 int npf_cache_all(npf_cache_t *, nbuf_t *); 168 169 bool npf_rwrip(npf_cache_t *, nbuf_t *, void *, const int, 170 npf_addr_t *); 171 bool npf_rwrport(npf_cache_t *, nbuf_t *, void *, const int, 172 in_port_t); 173 bool npf_rwrcksum(npf_cache_t *, nbuf_t *, void *, const int, 174 npf_addr_t *, in_port_t); 175 176 uint16_t npf_fixup16_cksum(uint16_t, uint16_t, uint16_t); 177 uint16_t npf_fixup32_cksum(uint16_t, uint32_t, uint32_t); 178 uint16_t npf_addr_cksum(uint16_t, int, npf_addr_t *, npf_addr_t *); 179 uint32_t npf_addr_sum(const int, const npf_addr_t *, const npf_addr_t *); 180 int npf_addr_cmp(const npf_addr_t *, const npf_netmask_t, 181 const npf_addr_t *, const npf_netmask_t, const int); 182 void npf_addr_mask(const npf_addr_t *, const npf_netmask_t, 183 const int, npf_addr_t *); 184 185 int npf_tcpsaw(const npf_cache_t *, tcp_seq *, tcp_seq *, 186 uint32_t *); 187 bool npf_fetch_tcpopts(const npf_cache_t *, nbuf_t *, 188 uint16_t *, int *); 189 bool npf_normalize(npf_cache_t *, nbuf_t *, bool, bool, u_int, u_int); 190 bool npf_return_block(npf_cache_t *, nbuf_t *, const int); 191 192 /* Complex instructions. */ 193 int npf_match_ether(nbuf_t *, int, int, uint16_t, uint32_t *); 194 int npf_match_proto(npf_cache_t *, nbuf_t *, void *, uint32_t); 195 int npf_match_table(npf_cache_t *, nbuf_t *, void *, 196 const int, const u_int); 197 int npf_match_ipmask(npf_cache_t *, nbuf_t *, void *, 198 const int, const npf_addr_t *, const npf_netmask_t); 199 int npf_match_tcp_ports(npf_cache_t *, nbuf_t *, void *, 200 const int, const uint32_t); 201 int npf_match_udp_ports(npf_cache_t *, nbuf_t *, void *, 202 const int, const uint32_t); 203 int npf_match_icmp4(npf_cache_t *, nbuf_t *, void *, uint32_t); 204 int npf_match_icmp6(npf_cache_t *, nbuf_t *, void *, uint32_t); 205 int npf_match_tcpfl(npf_cache_t *, nbuf_t *, void *, uint32_t); 206 207 /* Tableset interface. */ 208 void npf_tableset_sysinit(void); 209 void npf_tableset_sysfini(void); 210 211 extern const pt_tree_ops_t npf_table_ptree_ops; 212 213 npf_tableset_t *npf_tableset_create(void); 214 void npf_tableset_destroy(npf_tableset_t *); 215 int npf_tableset_insert(npf_tableset_t *, npf_table_t *); 216 npf_tableset_t *npf_tableset_reload(npf_tableset_t *); 217 218 npf_table_t * npf_table_create(u_int, int, size_t); 219 void npf_table_destroy(npf_table_t *); 220 void npf_table_ref(npf_table_t *); 221 void npf_table_unref(npf_table_t *); 222 223 npf_table_t * npf_table_get(npf_tableset_t *, u_int); 224 void npf_table_put(npf_table_t *); 225 int npf_table_check(const npf_tableset_t *, u_int, int); 226 int npf_table_insert(npf_tableset_t *, u_int, 227 const int, const npf_addr_t *, const npf_netmask_t); 228 int npf_table_remove(npf_tableset_t *, u_int, 229 const int, const npf_addr_t *, const npf_netmask_t); 230 int npf_table_lookup(npf_tableset_t *, u_int, 231 const int, const npf_addr_t *); 232 233 /* Ruleset interface. */ 234 npf_ruleset_t * npf_ruleset_create(void); 235 void npf_ruleset_destroy(npf_ruleset_t *); 236 void npf_ruleset_insert(npf_ruleset_t *, npf_rule_t *); 237 void npf_ruleset_natreload(npf_ruleset_t *, npf_ruleset_t *); 238 npf_rule_t * npf_ruleset_matchnat(npf_ruleset_t *, npf_natpolicy_t *); 239 npf_rule_t * npf_ruleset_sharepm(npf_ruleset_t *, npf_natpolicy_t *); 240 npf_rule_t * npf_ruleset_replace(const char *, npf_ruleset_t *); 241 void npf_ruleset_freealg(npf_ruleset_t *, npf_alg_t *); 242 243 npf_rule_t * npf_ruleset_inspect(npf_cache_t *, nbuf_t *, npf_ruleset_t *, 244 const ifnet_t *, const int, const int); 245 int npf_rule_apply(npf_cache_t *, nbuf_t *, npf_rule_t *, int *); 246 247 /* Rule interface. */ 248 npf_rule_t * npf_rule_alloc(prop_dictionary_t, npf_rproc_t *, void *, size_t); 249 void npf_rule_free(npf_rule_t *); 250 npf_ruleset_t * npf_rule_subset(npf_rule_t *); 251 npf_natpolicy_t *npf_rule_getnat(const npf_rule_t *); 252 void npf_rule_setnat(npf_rule_t *, npf_natpolicy_t *); 253 npf_rproc_t * npf_rule_getrproc(npf_rule_t *); 254 255 npf_rproc_t * npf_rproc_create(prop_dictionary_t); 256 void npf_rproc_acquire(npf_rproc_t *); 257 void npf_rproc_release(npf_rproc_t *); 258 void npf_rproc_run(npf_cache_t *, nbuf_t *, npf_rproc_t *, int); 259 260 /* Session handling interface. */ 261 void npf_session_sysinit(void); 262 void npf_session_sysfini(void); 263 int npf_session_tracking(bool); 264 265 npf_sehash_t * sess_htable_create(void); 266 void sess_htable_destroy(npf_sehash_t *); 267 void sess_htable_reload(npf_sehash_t *); 268 269 npf_session_t * npf_session_inspect(npf_cache_t *, nbuf_t *, 270 const ifnet_t *, const int, int *); 271 npf_session_t * npf_session_establish(const npf_cache_t *, nbuf_t *, 272 const ifnet_t *, const int); 273 void npf_session_release(npf_session_t *); 274 void npf_session_expire(npf_session_t *); 275 bool npf_session_pass(const npf_session_t *, npf_rproc_t **); 276 void npf_session_setpass(npf_session_t *, npf_rproc_t *); 277 int npf_session_setnat(npf_session_t *, npf_nat_t *, const int); 278 npf_nat_t * npf_session_retnat(npf_session_t *, const int, bool *); 279 280 int npf_session_save(prop_array_t, prop_array_t); 281 int npf_session_restore(npf_sehash_t *, prop_dictionary_t); 282 283 /* State handling. */ 284 bool npf_state_init(const npf_cache_t *, nbuf_t *, npf_state_t *); 285 bool npf_state_inspect(const npf_cache_t *, nbuf_t *, npf_state_t *, 286 const bool); 287 int npf_state_etime(const npf_state_t *, const int); 288 void npf_state_destroy(npf_state_t *); 289 290 bool npf_state_tcp(const npf_cache_t *, nbuf_t *, npf_state_t *, int); 291 int npf_state_tcp_timeout(const npf_state_t *); 292 293 /* NAT. */ 294 void npf_nat_sysinit(void); 295 void npf_nat_sysfini(void); 296 npf_natpolicy_t *npf_nat_newpolicy(prop_dictionary_t, npf_ruleset_t *); 297 void npf_nat_freepolicy(npf_natpolicy_t *); 298 bool npf_nat_matchpolicy(npf_natpolicy_t *, npf_natpolicy_t *); 299 bool npf_nat_sharepm(npf_natpolicy_t *, npf_natpolicy_t *); 300 void npf_nat_freealg(npf_natpolicy_t *, npf_alg_t *); 301 302 int npf_do_nat(npf_cache_t *, npf_session_t *, nbuf_t *, 303 const ifnet_t *, const int); 304 void npf_nat_expire(npf_nat_t *); 305 void npf_nat_getorig(npf_nat_t *, npf_addr_t **, in_port_t *); 306 void npf_nat_gettrans(npf_nat_t *, npf_addr_t **, in_port_t *); 307 void npf_nat_setalg(npf_nat_t *, npf_alg_t *, uintptr_t); 308 309 int npf_nat_save(prop_dictionary_t, prop_array_t, npf_nat_t *); 310 npf_nat_t * npf_nat_restore(prop_dictionary_t, npf_session_t *); 311 312 /* ALG interface. */ 313 void npf_alg_sysinit(void); 314 void npf_alg_sysfini(void); 315 npf_alg_t * npf_alg_register(npf_algfunc_t, npf_algfunc_t, 316 npf_algfunc_t, npf_algfunc_t); 317 int npf_alg_unregister(npf_alg_t *); 318 bool npf_alg_match(npf_cache_t *, nbuf_t *, npf_nat_t *); 319 void npf_alg_exec(npf_cache_t *, nbuf_t *, npf_nat_t *, const int ); 320 bool npf_alg_sessionid(npf_cache_t *, nbuf_t *, npf_cache_t *); 321 322 /* Debugging routines. */ 323 void npf_addr_dump(const npf_addr_t *); 324 void npf_rulenc_dump(const npf_rule_t *); 325 void npf_sessions_dump(void); 326 void npf_state_dump(const npf_state_t *); 327 void npf_nat_dump(const npf_nat_t *); 328 void npf_state_setsampler(void (*)(npf_state_t *, bool)); 329 330 #endif /* _NPF_IMPL_H_ */ 331
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