1 /* $NetBSD: ip_nat.h,v 1.7 2015/08/07 17:31:12 prlw1 Exp $ */ 2 3 /* 4 * Copyright (C) 2012 by Darren Reed. 5 * 6 * See the IPFILTER.LICENCE file for details on licencing. 7 * 8 * @(#)ip_nat.h 1.5 2/4/96 9 * Id: ip_nat.h,v 1.1.1.2 2012/07/22 13:45:29 darrenr Exp 10 */ 11 12 #ifndef __IP_NAT_H__ 13 #define __IP_NAT_H__ 14 15 #ifndef SOLARIS 16 # if (defined(sun) && (defined(__svr4__) || defined(__SVR4))) 17 # define SOLARIS 1 18 # else 19 # define SOLARIS 0 20 # endif 21 #endif 22 23 #if defined(__STDC__) || defined(__GNUC__) || defined(_AIX51) 24 #define SIOCADNAT _IOW('r', 60, struct ipfobj) 25 #define SIOCRMNAT _IOW('r', 61, struct ipfobj) 26 #define SIOCGNATS _IOWR('r', 62, struct ipfobj) 27 #define SIOCGNATL _IOWR('r', 63, struct ipfobj) 28 #define SIOCPURGENAT _IOWR('r', 100, struct ipfobj) 29 #else 30 #define SIOCADNAT _IOW(r, 60, struct ipfobj) 31 #define SIOCRMNAT _IOW(r, 61, struct ipfobj) 32 #define SIOCGNATS _IOWR(r, 62, struct ipfobj) 33 #define SIOCGNATL _IOWR(r, 63, struct ipfobj) 34 #define SIOCPURGENAT _IOWR(r, 100, struct ipfobj) 35 #endif 36 37 #undef LARGE_NAT /* define this if you're setting up a system to NAT 38 * LARGE numbers of networks/hosts - i.e. in the 39 * hundreds or thousands. In such a case, you should 40 * also change the RDR_SIZE and NAT_SIZE below to more 41 * appropriate sizes. The figures below were used for 42 * a setup with 1000-2000 networks to NAT. 43 */ 44 #ifndef NAT_SIZE 45 # ifdef LARGE_NAT 46 # define NAT_SIZE 2047 47 # else 48 # define NAT_SIZE 127 49 # endif 50 #endif 51 #ifndef RDR_SIZE 52 # ifdef LARGE_NAT 53 # define RDR_SIZE 2047 54 # else 55 # define RDR_SIZE 127 56 # endif 57 #endif 58 #ifndef HOSTMAP_SIZE 59 # ifdef LARGE_NAT 60 # define HOSTMAP_SIZE 8191 61 # else 62 # define HOSTMAP_SIZE 2047 63 # endif 64 #endif 65 #ifndef NAT_TABLE_MAX 66 /* 67 * This is newly introduced and for the sake of "least surprise", the numbers 68 * present aren't what we'd normally use for creating a proper hash table. 69 */ 70 # ifdef LARGE_NAT 71 # define NAT_TABLE_MAX 180000 72 # else 73 # define NAT_TABLE_MAX 30000 74 # endif 75 #endif 76 #ifndef NAT_TABLE_SZ 77 # ifdef LARGE_NAT 78 # define NAT_TABLE_SZ 16383 79 # else 80 # define NAT_TABLE_SZ 2047 81 # endif 82 #endif 83 #ifndef APR_LABELLEN 84 #define APR_LABELLEN 16 85 #endif 86 #define NAT_HW_CKSUM 0x80000000 87 #define NAT_HW_CKSUM_PART 0x40000000 88 89 #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */ 90 91 struct ipstate; 92 struct ap_session; 93 94 /* 95 * This structure is used in the active NAT table and represents an 96 * active NAT session. 97 * 98 * Generally nat_t structures have references from at least two places. 99 * The first place gives them a position in a linked list of NAT sessions 100 * per instace of IPFilter. In this linked list, nat_next always points to 101 * the next entry in the list and nat_pnext points to the pointer that 102 * introduces the structure. That may be either the top of the list pointer 103 * or simply the nat_next of the previous link in the list. The second place 104 * that a nat_t structure is generally referenced from is the NAT hash table. 105 * Two references from this table are required, one for supporting the of 106 * matching packets being transmitted and one for supporting the matching of 107 * packets being received. The hash table is comprised of buckets, each one 108 * having its own chain of nat_t structures. To support these chains, 109 * nat_hnext is used to point to the next member of the chain and nat_phnext 110 * points back to the pointer that is pointing to the nat_t in the chain, 111 * be it the bucket at the top or simply the previous nat_t chain entry. 112 */ 113 typedef struct nat { 114 ipfmutex_t nat_lock; 115 struct nat *nat_next; 116 struct nat **nat_pnext; 117 struct nat *nat_hnext[2]; 118 struct nat **nat_phnext[2]; 119 struct hostmap *nat_hm; 120 void *nat_data; 121 struct nat **nat_me; 122 struct ipstate *nat_state; 123 struct ap_session *nat_aps; /* proxy session */ 124 frentry_t *nat_fr; /* filter rule ptr if appropriate */ 125 struct ipnat *nat_ptr; /* pointer back to the rule */ 126 void *nat_ifps[2]; 127 void *nat_sync; 128 ipftqent_t nat_tqe; 129 int nat_mtu[2]; 130 u_32_t nat_flags; 131 u_32_t nat_sumd[2]; /* ip checksum delta for data segment*/ 132 u_32_t nat_ipsumd; /* ip checksum delta for ip header */ 133 u_32_t nat_mssclamp; /* if != zero clamp MSS to this */ 134 i6addr_t nat_odst6; 135 i6addr_t nat_osrc6; 136 i6addr_t nat_ndst6; 137 i6addr_t nat_nsrc6; 138 U_QUAD_T nat_pkts[2]; 139 U_QUAD_T nat_bytes[2]; 140 union { 141 udpinfo_t nat_unu; 142 tcpinfo_t nat_unt; 143 icmpinfo_t nat_uni; 144 greinfo_t nat_ugre; 145 } nat_unold, nat_unnew; 146 int nat_use; 147 int nat_pr[2]; /* protocol for NAT */ 148 int nat_dir; 149 int nat_ref; /* reference count */ 150 u_int nat_hv[2]; 151 char nat_ifnames[2][LIFNAMSIZ]; 152 int nat_rev; /* 0 = forward, 1 = reverse */ 153 int nat_dlocal; 154 int nat_v[2]; /* 0 = old, 1 = new */ 155 u_int nat_redir; /* copy of in_redir */ 156 } nat_t; 157 158 #define nat_osrcip nat_osrc6.in4 159 #define nat_odstip nat_odst6.in4 160 #define nat_nsrcip nat_nsrc6.in4 161 #define nat_ndstip nat_ndst6.in4 162 #define nat_osrcaddr nat_osrc6.in4.s_addr 163 #define nat_odstaddr nat_odst6.in4.s_addr 164 #define nat_nsrcaddr nat_nsrc6.in4.s_addr 165 #define nat_ndstaddr nat_ndst6.in4.s_addr 166 #define nat_age nat_tqe.tqe_die 167 #define nat_osport nat_unold.nat_unt.ts_sport 168 #define nat_odport nat_unold.nat_unt.ts_dport 169 #define nat_nsport nat_unnew.nat_unt.ts_sport 170 #define nat_ndport nat_unnew.nat_unt.ts_dport 171 #define nat_oicmpid nat_unold.nat_uni.ici_id 172 #define nat_nicmpid nat_unnew.nat_uni.ici_id 173 #define nat_type nat_unold.nat_uni.ici_type 174 #define nat_oseq nat_unold.nat_uni.ici_seq 175 #define nat_nseq nat_unnew.nat_uni.ici_seq 176 #define nat_tcpstate nat_tqe.tqe_state 177 #define nat_die nat_tqe.tqe_die 178 #define nat_touched nat_tqe.tqe_touched 179 180 /* 181 * Values for nat_dir 182 */ 183 #define NAT_INBOUND 0 184 #define NAT_OUTBOUND 1 185 #define NAT_ENCAPIN 2 186 #define NAT_ENCAPOUT 3 187 #define NAT_DIVERTIN 4 188 #define NAT_DIVERTOUT 5 189 190 /* 191 * Definitions for nat_flags 192 */ 193 #define NAT_TCP 0x0001 /* IPN_TCP */ 194 #define NAT_UDP 0x0002 /* IPN_UDP */ 195 #define NAT_ICMPERR 0x0004 /* IPN_ICMPERR */ 196 #define NAT_ICMPQUERY 0x0008 /* IPN_ICMPQUERY */ 197 #define NAT_SEARCH 0x0010 198 #define NAT_SLAVE 0x0020 /* Slave connection for a proxy */ 199 #define NAT_NOTRULEPORT 0x0040 /* Don't use the port # in the NAT rule */ 200 201 #define NAT_TCPUDP (NAT_TCP|NAT_UDP) 202 #define NAT_TCPUDPICMP (NAT_TCP|NAT_UDP|NAT_ICMPERR) 203 #define NAT_TCPUDPICMPQ (NAT_TCP|NAT_UDP|NAT_ICMPQUERY) 204 #define NAT_FROMRULE (NAT_TCP|NAT_UDP) 205 206 /* 0x0100 reserved for FI_W_SPORT */ 207 /* 0x0200 reserved for FI_W_DPORT */ 208 /* 0x0400 reserved for FI_W_SADDR */ 209 /* 0x0800 reserved for FI_W_DADDR */ 210 /* 0x1000 reserved for FI_W_NEWFR */ 211 /* 0x2000 reserved for SI_CLONE */ 212 /* 0x4000 reserved for SI_CLONED */ 213 /* 0x8000 reserved for SI_IGNOREPKT */ 214 215 #define NAT_DEBUG 0x800000 216 217 typedef struct nat_addr_s { 218 i6addr_t na_addr[2]; 219 i6addr_t na_nextaddr; 220 int na_atype; 221 int na_function; 222 } nat_addr_t; 223 224 #define na_nextip na_nextaddr.in4.s_addr 225 #define na_nextip6 na_nextaddr.in6 226 #define na_num na_addr[0].iplookupnum 227 #define na_type na_addr[0].iplookuptype 228 #define na_subtype na_addr[0].iplookupsubtype 229 #define na_ptr na_addr[1].iplookupptr 230 #define na_func na_addr[1].iplookupfunc 231 232 233 /* 234 * This structure represents an actual NAT rule, loaded by ipnat. 235 */ 236 typedef struct ipnat { 237 ipfmutex_t in_lock; 238 struct ipnat *in_next; /* NAT rule list next */ 239 struct ipnat **in_pnext; /* prior rdr next ptr */ 240 struct ipnat *in_rnext; /* rdr rule hash next */ 241 struct ipnat **in_prnext; /* prior rdr next ptr */ 242 struct ipnat *in_mnext; /* map rule hash next */ 243 struct ipnat **in_pmnext; /* prior map next ptr */ 244 struct ipftq *in_tqehead[2]; 245 void *in_ifps[2]; 246 void *in_apr; 247 char *in_comment; 248 mb_t *in_divmp; 249 void *in_pconf; 250 U_QUAD_T in_pkts[2]; 251 U_QUAD_T in_bytes[2]; 252 u_long in_space; 253 u_long in_hits; 254 int in_size; 255 int in_use; 256 u_int in_hv[2]; 257 int in_flineno; /* conf. file line number */ 258 int in_stepnext; 259 int in_dlocal; 260 u_short in_dpnext; 261 u_short in_spnext; 262 /* From here to the end is covered by IPN_CMPSIZ */ 263 u_char in_v[2]; /* 0 = old, 1 = new */ 264 u_32_t in_flags; 265 u_32_t in_mssclamp; /* if != 0 clamp MSS to this */ 266 u_int in_age[2]; 267 int in_redir; /* see below for values */ 268 int in_pr[2]; /* protocol. */ 269 nat_addr_t in_ndst; 270 nat_addr_t in_nsrc; 271 nat_addr_t in_osrc; 272 nat_addr_t in_odst; 273 frtuc_t in_tuc; 274 u_short in_ppip; /* ports per IP. */ 275 u_short in_ippip; /* IP #'s per IP# */ 276 u_short in_ndports[2]; 277 u_short in_nsports[2]; 278 int in_ifnames[2]; 279 int in_plabel; /* proxy label. */ 280 int in_pconfig; /* proxy label. */ 281 ipftag_t in_tag; 282 int in_namelen; 283 char in_names[1]; 284 } ipnat_t; 285 286 /* 287 * MAP-IN MAP-OUT RDR-IN RDR-OUT 288 * osrc X == src == src X 289 * odst X == dst == dst X 290 * nsrc == dst X X == dst 291 * ndst == src X X == src 292 */ 293 #define in_dpmin in_ndports[0] /* Also holds static redir port */ 294 #define in_dpmax in_ndports[1] 295 #define in_spmin in_nsports[0] /* Also holds static redir port */ 296 #define in_spmax in_nsports[1] 297 #define in_ndport in_ndports[0] 298 #define in_nsport in_nsports[0] 299 #define in_dipnext in_ndst.na_nextaddr.in4 300 #define in_dipnext6 in_ndst.na_nextaddr 301 #define in_dnip in_ndst.na_nextaddr.in4.s_addr 302 #define in_dnip6 in_ndst.na_nextaddr 303 #define in_sipnext in_nsrc.na_nextaddr.in4 304 #define in_snip in_nsrc.na_nextaddr.in4.s_addr 305 #define in_snip6 in_nsrc.na_nextaddr 306 #define in_odstip in_odst.na_addr[0].in4 307 #define in_odstip6 in_odst.na_addr[0] 308 #define in_odstaddr in_odst.na_addr[0].in4.s_addr 309 #define in_odstmsk in_odst.na_addr[1].in4.s_addr 310 #define in_odstmsk6 in_odst.na_addr[1] 311 #define in_odstatype in_odst.na_atype 312 #define in_osrcip in_osrc.na_addr[0].in4 313 #define in_osrcip6 in_osrc.na_addr[0] 314 #define in_osrcaddr in_osrc.na_addr[0].in4.s_addr 315 #define in_osrcmsk in_osrc.na_addr[1].in4.s_addr 316 #define in_osrcmsk6 in_osrc.na_addr[1] 317 #define in_osrcatype in_osrc.na_atype 318 #define in_ndstip in_ndst.na_addr[0].in4 319 #define in_ndstip6 in_ndst.na_addr[0] 320 #define in_ndstaddr in_ndst.na_addr[0].in4.s_addr 321 #define in_ndstmsk in_ndst.na_addr[1].in4.s_addr 322 #define in_ndstmsk6 in_ndst.na_addr[1] 323 #define in_ndstatype in_ndst.na_atype 324 #define in_ndstafunc in_ndst.na_function 325 #define in_nsrcip in_nsrc.na_addr[0].in4 326 #define in_nsrcip6 in_nsrc.na_addr[0] 327 #define in_nsrcaddr in_nsrc.na_addr[0].in4.s_addr 328 #define in_nsrcmsk in_nsrc.na_addr[1].in4.s_addr 329 #define in_nsrcmsk6 in_nsrc.na_addr[1] 330 #define in_nsrcatype in_nsrc.na_atype 331 #define in_nsrcafunc in_nsrc.na_function 332 #define in_scmp in_tuc.ftu_scmp 333 #define in_dcmp in_tuc.ftu_dcmp 334 #define in_stop in_tuc.ftu_stop 335 #define in_dtop in_tuc.ftu_dtop 336 #define in_osport in_tuc.ftu_sport 337 #define in_odport in_tuc.ftu_dport 338 #define in_ndstnum in_ndst.na_addr[0].iplookupnum 339 #define in_ndsttype in_ndst.na_addr[0].iplookuptype 340 #define in_ndstptr in_ndst.na_addr[1].iplookupptr 341 #define in_ndstfunc in_ndst.na_addr[1].iplookupfunc 342 #define in_nsrcnum in_nsrc.na_addr[0].iplookupnum 343 #define in_nsrctype in_nsrc.na_addr[0].iplookuptype 344 #define in_nsrcptr in_nsrc.na_addr[1].iplookupptr 345 #define in_nsrcfunc in_nsrc.na_addr[1].iplookupfunc 346 #define in_odstnum in_odst.na_addr[0].iplookupnum 347 #define in_odsttype in_odst.na_addr[0].iplookuptype 348 #define in_odstptr in_odst.na_addr[1].iplookupptr 349 #define in_odstfunc in_odst.na_addr[1].iplookupfunc 350 #define in_osrcnum in_osrc.na_addr[0].iplookupnum 351 #define in_osrctype in_osrc.na_addr[0].iplookuptype 352 #define in_osrcptr in_osrc.na_addr[1].iplookupptr 353 #define in_osrcfunc in_osrc.na_addr[1].iplookupfunc 354 #define in_icmpidmin in_nsports[0] 355 #define in_icmpidmax in_nsports[1] 356 357 /* 358 * Bit definitions for in_flags 359 */ 360 #define IPN_ANY 0x00000 361 #define IPN_TCP 0x00001 362 #define IPN_UDP 0x00002 363 #define IPN_TCPUDP (IPN_TCP|IPN_UDP) 364 #define IPN_ICMPERR 0x00004 365 #define IPN_TCPUDPICMP (IPN_TCP|IPN_UDP|IPN_ICMPERR) 366 #define IPN_ICMPQUERY 0x00008 367 #define IPN_TCPUDPICMPQ (IPN_TCP|IPN_UDP|IPN_ICMPQUERY) 368 #define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR) 369 #define IPN_AUTOPORTMAP 0x00010 370 #define IPN_FILTER 0x00020 371 #define IPN_SPLIT 0x00040 372 #define IPN_ROUNDR 0x00080 373 #define IPN_SIPRANGE 0x00100 374 #define IPN_DIPRANGE 0x00200 375 #define IPN_NOTSRC 0x00400 376 #define IPN_NOTDST 0x00800 377 #define IPN_NO 0x01000 378 #define IPN_DYNSRCIP 0x02000 /* dynamic src IP# */ 379 #define IPN_DYNDSTIP 0x04000 /* dynamic dst IP# */ 380 #define IPN_DELETE 0x08000 381 #define IPN_STICKY 0x10000 382 #define IPN_FRAG 0x20000 383 #define IPN_FIXEDSPORT 0x40000 384 #define IPN_FIXEDDPORT 0x80000 385 #define IPN_FINDFORWARD 0x100000 386 #define IPN_IN 0x200000 387 #define IPN_SEQUENTIAL 0x400000 388 #define IPN_PURGE 0x800000 389 #define IPN_PROXYRULE 0x1000000 390 #define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_SIPRANGE|IPN_SPLIT|\ 391 IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_NO|\ 392 IPN_FRAG|IPN_STICKY|IPN_FIXEDDPORT|IPN_ICMPQUERY|\ 393 IPN_DIPRANGE|IPN_SEQUENTIAL|IPN_PURGE) 394 395 /* 396 * Values for in_redir 397 */ 398 #define NAT_MAP 0x01 399 #define NAT_REDIRECT 0x02 400 #define NAT_BIMAP (NAT_MAP|NAT_REDIRECT) 401 #define NAT_MAPBLK 0x04 402 #define NAT_REWRITE 0x08 403 #define NAT_ENCAP 0x10 404 #define NAT_DIVERTUDP 0x20 405 406 #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */ 407 #define USABLE_PORTS (65536 - MAPBLK_MINPORT) 408 409 #define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_v)) 410 411 typedef struct natlookup { 412 i6addr_t nl_inipaddr; 413 i6addr_t nl_outipaddr; 414 i6addr_t nl_realipaddr; 415 int nl_v; 416 int nl_flags; 417 u_short nl_inport; 418 u_short nl_outport; 419 u_short nl_realport; 420 } natlookup_t; 421 422 #define nl_inip nl_inipaddr.in4 423 #define nl_outip nl_outipaddr.in4 424 #define nl_realip nl_realipaddr.in4 425 #define nl_inip6 nl_inipaddr.in6 426 #define nl_outip6 nl_outipaddr.in6 427 #define nl_realip6 nl_realipaddr.in6 428 429 430 typedef struct nat_save { 431 void *ipn_next; 432 struct nat ipn_nat; 433 struct ipnat ipn_ipnat; 434 struct frentry ipn_fr; 435 int ipn_dsize; 436 char ipn_data[4]; 437 } nat_save_t; 438 439 #define ipn_rule ipn_nat.nat_fr 440 441 typedef struct natget { 442 void *ng_ptr; 443 int ng_sz; 444 } natget_t; 445 446 447 /* 448 * This structure gets used to help NAT sessions keep the same NAT rule (and 449 * thus translation for IP address) when: 450 * (a) round-robin redirects are in use 451 * (b) different IP add 452 */ 453 typedef struct hostmap { 454 struct hostmap *hm_hnext; 455 struct hostmap **hm_phnext; 456 struct hostmap *hm_next; 457 struct hostmap **hm_pnext; 458 struct ipnat *hm_ipnat; 459 i6addr_t hm_osrcip6; 460 i6addr_t hm_odstip6; 461 i6addr_t hm_nsrcip6; 462 i6addr_t hm_ndstip6; 463 u_32_t hm_port; 464 int hm_ref; 465 int hm_hv; 466 int hm_v; 467 } hostmap_t; 468 469 #define hm_osrcip hm_osrcip6.in4 470 #define hm_odstip hm_odstip6.in4 471 #define hm_nsrcip hm_nsrcip6.in4 472 #define hm_ndstip hm_ndstip6.in4 473 #define hm_osrc6 hm_osrcip6.in6 474 #define hm_odst6 hm_odstip6.in6 475 #define hm_nsrc6 hm_nsrcip6.in6 476 #define hm_ndst6 hm_ndstip6.in6 477 478 479 /* 480 * Structure used to pass information in to nat_newmap and nat_newrdr. 481 */ 482 typedef struct natinfo { 483 ipnat_t *nai_np; 484 u_32_t nai_sum1; 485 u_32_t nai_sum2; 486 struct in_addr nai_ip; /* In host byte order */ 487 u_short nai_port; 488 u_short nai_nport; 489 u_short nai_sport; 490 u_short nai_dport; 491 } natinfo_t; 492 493 494 typedef struct nat_stat_side { 495 u_int *ns_bucketlen; 496 nat_t **ns_table; 497 u_long ns_added; 498 u_long ns_appr_fail; 499 u_long ns_badnat; 500 u_long ns_badnatnew; 501 u_long ns_badnextaddr; 502 u_long ns_bucket_max; 503 u_long ns_clone_nomem; 504 u_long ns_decap_bad; 505 u_long ns_decap_fail; 506 u_long ns_decap_pullup; 507 u_long ns_divert_dup; 508 u_long ns_divert_exist; 509 u_long ns_drop; 510 u_long ns_encap_dup; 511 u_long ns_encap_pullup; 512 u_long ns_exhausted; 513 u_long ns_icmp_address; 514 u_long ns_icmp_basic; 515 u_long ns_icmp_mbuf; 516 u_long ns_icmp_notfound; 517 u_long ns_icmp_rebuild; 518 u_long ns_icmp_short; 519 u_long ns_icmp_size; 520 u_long ns_ifpaddrfail; 521 u_long ns_ignored; 522 u_long ns_insert_fail; 523 u_long ns_inuse; 524 u_long ns_log; 525 u_long ns_lookup_miss; 526 u_long ns_lookup_nowild; 527 u_long ns_new_ifpaddr; 528 u_long ns_memfail; 529 u_long ns_table_max; 530 u_long ns_translated; 531 u_long ns_unfinalised; 532 u_long ns_wrap; 533 u_long ns_xlate_null; 534 u_long ns_xlate_exists; 535 u_long ns_ipf_proxy_fail; 536 u_long ns_uncreate[2]; 537 } nat_stat_side_t; 538 539 540 typedef struct natstat { 541 nat_t *ns_instances; 542 ipnat_t *ns_list; 543 hostmap_t *ns_maplist; 544 hostmap_t **ns_maptable; 545 u_int ns_active; 546 u_long ns_addtrpnt; 547 u_long ns_divert_build; 548 u_long ns_expire; 549 u_long ns_flush_all; 550 u_long ns_flush_closing; 551 u_long ns_flush_queue; 552 u_long ns_flush_state; 553 u_long ns_flush_timeout; 554 u_long ns_hm_new; 555 u_long ns_hm_newfail; 556 u_long ns_hm_addref; 557 u_long ns_hm_nullnp; 558 u_long ns_log_ok; 559 u_long ns_log_fail; 560 u_int ns_hostmap_sz; 561 u_int ns_nattab_sz; 562 u_int ns_nattab_max; 563 u_int ns_orphans; 564 u_int ns_rules; 565 u_int ns_rules_map; 566 u_int ns_rules_rdr; 567 u_int ns_rultab_sz; 568 u_int ns_rdrtab_sz; 569 u_32_t ns_ticks; 570 u_int ns_trpntab_sz; 571 u_int ns_wilds; 572 u_long ns_proto[256]; 573 nat_stat_side_t ns_side[2]; 574 #ifdef USE_INET6 575 nat_stat_side_t ns_side6[2]; 576 #endif 577 } natstat_t; 578 579 typedef struct natlog { 580 i6addr_t nl_osrcip; 581 i6addr_t nl_odstip; 582 i6addr_t nl_nsrcip; 583 i6addr_t nl_ndstip; 584 u_short nl_osrcport; 585 u_short nl_odstport; 586 u_short nl_nsrcport; 587 u_short nl_ndstport; 588 int nl_action; 589 int nl_type; 590 int nl_rule; 591 U_QUAD_T nl_pkts[2]; 592 U_QUAD_T nl_bytes[2]; 593 u_char nl_p[2]; 594 u_char nl_v[2]; 595 u_char nl_ifnames[2][LIFNAMSIZ]; 596 } natlog_t; 597 598 599 #define NL_NEW 0 600 #define NL_CLONE 1 601 #define NL_PURGE 0xfffc 602 #define NL_DESTROY 0xfffd 603 #define NL_FLUSH 0xfffe 604 #define NL_EXPIRE 0xffff 605 606 #define NAT_HASH_FN(_k,_l,_m) (((_k) + ((_k) >> 12) + _l) % (_m)) 607 #define NAT_HASH_FN6(_k,_l,_m) ((((u_32_t *)(_k))[3] \ 608 + (((u_32_t *)(_k))[3] >> 12) \ 609 + (((u_32_t *)(_k))[2]) \ 610 + (((u_32_t *)(_k))[2] >> 12) \ 611 + (((u_32_t *)(_k))[1]) \ 612 + (((u_32_t *)(_k))[1] >> 12) \ 613 + (((u_32_t *)(_k))[0]) \ 614 + (((u_32_t *)(_k))[0] >> 12) \ 615 + _l) % (_m)) 616 617 #define LONG_SUM(_i) (((_i) & 0xffff) + ((_i) >> 16)) 618 #define LONG_SUM6(_i) (LONG_SUM(ntohl(((u_32_t *)(_i))[0])) + \ 619 LONG_SUM(ntohl(((u_32_t *)(_i))[1])) + \ 620 LONG_SUM(ntohl(((u_32_t *)(_i))[2])) + \ 621 LONG_SUM(ntohl(((u_32_t *)(_i))[3]))) 622 623 #define CALC_SUMD(s1, s2, sd) { \ 624 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ 625 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ 626 /* Do it twice */ \ 627 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ 628 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ 629 /* Because ~1 == -2, We really need ~1 == -1 */ \ 630 if ((s1) > (s2)) (s2)--; \ 631 (sd) = (s2) - (s1); \ 632 (sd) = ((sd) & 0xffff) + ((sd) >> 16); } 633 634 #define NAT_SYSSPACE 0x80000000 635 #define NAT_LOCKHELD 0x40000000 636 637 /* 638 * This is present in ip_nat.h because it needs to be shared between 639 * ip_nat.c and ip_nat6.c 640 */ 641 typedef struct ipf_nat_softc_s { 642 ipfmutex_t ipf_nat_new; 643 ipfmutex_t ipf_nat_io; 644 int ipf_nat_doflush; 645 int ipf_nat_logging; 646 int ipf_nat_lock; 647 int ipf_nat_inited; 648 int ipf_nat_table_wm_high; 649 int ipf_nat_table_wm_low; 650 u_int ipf_nat_table_max; 651 u_int ipf_nat_table_sz; 652 u_int ipf_nat_maprules_sz; 653 u_int ipf_nat_rdrrules_sz; 654 u_int ipf_nat_hostmap_sz; 655 u_int ipf_nat_maxbucket; 656 u_int ipf_nat_last_force_flush; 657 u_int ipf_nat_defage; 658 u_int ipf_nat_defipage; 659 u_int ipf_nat_deficmpage; 660 ipf_v4_masktab_t ipf_nat_map_mask; 661 ipf_v6_masktab_t ipf_nat6_map_mask; 662 ipf_v4_masktab_t ipf_nat_rdr_mask; 663 ipf_v6_masktab_t ipf_nat6_rdr_mask; 664 nat_t **ipf_nat_table[2]; 665 nat_t *ipf_nat_instances; 666 ipnat_t *ipf_nat_list; 667 ipnat_t **ipf_nat_list_tail; 668 ipnat_t **ipf_nat_map_rules; 669 ipnat_t **ipf_nat_rdr_rules; 670 ipftq_t *ipf_nat_utqe; 671 hostmap_t **ipf_hm_maptable ; 672 hostmap_t *ipf_hm_maplist ; 673 ipftuneable_t *ipf_nat_tune; 674 ipftq_t ipf_nat_udptq; 675 ipftq_t ipf_nat_udpacktq; 676 ipftq_t ipf_nat_icmptq; 677 ipftq_t ipf_nat_icmpacktq; 678 ipftq_t ipf_nat_iptq; 679 ipftq_t ipf_nat_pending; 680 ipftq_t ipf_nat_tcptq[IPF_TCP_NSTATES]; 681 natstat_t ipf_nat_stats; 682 } ipf_nat_softc_t ; 683 684 #define ipf_nat_map_max ipf_nat_map_mask.imt4_max 685 #define ipf_nat_rdr_max ipf_nat_rdr_mask.imt4_max 686 #define ipf_nat6_map_max ipf_nat6_map_mask.imt6_max 687 #define ipf_nat6_rdr_max ipf_nat6_rdr_mask.imt6_max 688 #define ipf_nat_map_active_masks ipf_nat_map_mask.imt4_active 689 #define ipf_nat_rdr_active_masks ipf_nat_rdr_mask.imt4_active 690 #define ipf_nat6_map_active_masks ipf_nat6_map_mask.imt6_active 691 #define ipf_nat6_rdr_active_masks ipf_nat6_rdr_mask.imt6_active 692 693 extern frentry_t ipfnatblock; 694 695 extern void ipf_fix_datacksum(u_short *, u_32_t); 696 extern void ipf_fix_incksum(int, u_short *, u_32_t, u_32_t); 697 extern void ipf_fix_outcksum(int, u_short *, u_32_t, u_32_t); 698 699 extern int ipf_nat_checkin(fr_info_t *, u_32_t *); 700 extern int ipf_nat_checkout(fr_info_t *, u_32_t *); 701 extern void ipf_nat_delete(ipf_main_softc_t *, struct nat *, int); 702 extern void ipf_nat_deref(ipf_main_softc_t *, nat_t **); 703 extern void ipf_nat_expire(ipf_main_softc_t *); 704 extern int ipf_nat_hashtab_add(ipf_main_softc_t *, 705 ipf_nat_softc_t *, nat_t *); 706 extern void ipf_nat_hostmapdel(ipf_main_softc_t *, hostmap_t **); 707 extern int ipf_nat_hostmap_rehash(ipf_main_softc_t *, 708 ipftuneable_t *, ipftuneval_t *); 709 extern nat_t *ipf_nat_icmperrorlookup(fr_info_t *, int); 710 extern nat_t *ipf_nat_icmperror(fr_info_t *, u_int *, int); 711 #if defined(__OpenBSD__) 712 extern void ipf_nat_ifdetach(void *); 713 #endif 714 extern int ipf_nat_init(void); 715 extern nat_t *ipf_nat_inlookup(fr_info_t *, u_int, u_int, 716 struct in_addr, struct in_addr); 717 extern int ipf_nat_in(fr_info_t *, nat_t *, int, u_32_t); 718 extern int ipf_nat_insert(ipf_main_softc_t *, ipf_nat_softc_t *, 719 nat_t *); 720 extern int ipf_nat_ioctl(ipf_main_softc_t *, void *, ioctlcmd_t, 721 int, int, void *); 722 extern void ipf_nat_log(ipf_main_softc_t *, ipf_nat_softc_t *, 723 struct nat *, u_int); 724 extern nat_t *ipf_nat_lookupredir(ipf_main_softc_t *, natlookup_t *); 725 extern nat_t *ipf_nat_maplookup(void *, u_int, struct in_addr, 726 struct in_addr); 727 extern nat_t *ipf_nat_add(fr_info_t *, ipnat_t *, nat_t **, 728 u_int, int); 729 extern int ipf_nat_out(fr_info_t *, nat_t *, int, u_32_t); 730 extern nat_t *ipf_nat_outlookup(fr_info_t *, u_int, u_int, 731 struct in_addr, struct in_addr); 732 extern u_short *ipf_nat_proto(fr_info_t *, nat_t *, u_int); 733 extern void ipf_nat_rule_deref(ipf_main_softc_t *, ipnat_t **); 734 extern void ipf_nat_setqueue(ipf_main_softc_t *, ipf_nat_softc_t *, 735 nat_t *); 736 extern void ipf_nat_setpending(ipf_main_softc_t *, nat_t *); 737 extern nat_t *ipf_nat_tnlookup(fr_info_t *, int); 738 extern void ipf_nat_update(fr_info_t *, nat_t *); 739 extern frentry_t *ipf_nat_ipfin(fr_info_t *, u_32_t *); 740 extern frentry_t *ipf_nat_ipfout(fr_info_t *, u_32_t *); 741 extern int ipf_nat_in(fr_info_t *, nat_t *, int, u_32_t); 742 extern int ipf_nat_out(fr_info_t *, nat_t *, int, u_32_t); 743 extern int ipf_nat_rehash(ipf_main_softc_t *, ipftuneable_t *, 744 ipftuneval_t *); 745 extern int ipf_nat_rehash_rules(ipf_main_softc_t *, ipftuneable_t *, 746 ipftuneval_t *); 747 extern int ipf_nat_settimeout(struct ipf_main_softc_s *, 748 ipftuneable_t *, ipftuneval_t *); 749 extern void ipf_nat_sync(ipf_main_softc_t *, void *); 750 751 extern nat_t *ipf_nat_clone(fr_info_t *, nat_t *); 752 extern void ipf_nat_delmap(ipf_nat_softc_t *, ipnat_t *); 753 extern void ipf_nat_delrdr(ipf_nat_softc_t *, ipnat_t *); 754 extern int ipf_nat_wildok(nat_t *, int, int, int, int); 755 extern void ipf_nat_setlock(void *, int); 756 extern void ipf_nat_load(void); 757 extern void *ipf_nat_soft_create(ipf_main_softc_t *); 758 extern int ipf_nat_soft_init(ipf_main_softc_t *, void *); 759 extern void ipf_nat_soft_destroy(ipf_main_softc_t *, void *); 760 extern int ipf_nat_soft_fini(ipf_main_softc_t *, void *); 761 extern int ipf_nat_main_load(void); 762 extern int ipf_nat_main_unload(void); 763 extern ipftq_t *ipf_nat_add_tq(ipf_main_softc_t *, int); 764 extern void ipf_nat_uncreate(fr_info_t *); 765 766 #ifdef USE_INET6 767 extern nat_t *ipf_nat6_add(fr_info_t *, ipnat_t *, nat_t **, 768 u_int, int); 769 extern void ipf_nat6_addrdr(ipf_nat_softc_t *, ipnat_t *); 770 extern void ipf_nat6_addmap(ipf_nat_softc_t *, ipnat_t *); 771 extern int ipf_nat6_checkout(fr_info_t *, u_32_t *); 772 extern int ipf_nat6_checkin(fr_info_t *, u_32_t *); 773 extern void ipf_nat6_delmap(ipf_nat_softc_t *, ipnat_t *); 774 extern void ipf_nat6_delrdr(ipf_nat_softc_t *, ipnat_t *); 775 extern int ipf_nat6_finalise(fr_info_t *, nat_t *); 776 extern nat_t *ipf_nat6_icmperror(fr_info_t *, u_int *, int); 777 extern nat_t *ipf_nat6_icmperrorlookup(fr_info_t *, int); 778 extern nat_t *ipf_nat6_inlookup(fr_info_t *, u_int, u_int, 779 struct in6_addr *, struct in6_addr *); 780 extern u_32_t ipf_nat6_ip6subtract(i6addr_t *, i6addr_t *); 781 extern frentry_t *ipf_nat6_ipfin(fr_info_t *, u_32_t *); 782 extern frentry_t *ipf_nat6_ipfout(fr_info_t *, u_32_t *); 783 extern nat_t *ipf_nat6_lookupredir(ipf_main_softc_t *, natlookup_t *); 784 extern int ipf_nat6_newmap(fr_info_t *, nat_t *, natinfo_t *); 785 extern int ipf_nat6_newrdr(fr_info_t *, nat_t *, natinfo_t *); 786 extern nat_t *ipf_nat6_outlookup(fr_info_t *, u_int, u_int, 787 struct in6_addr *, struct in6_addr *); 788 extern int ipf_nat6_newrewrite(fr_info_t *, nat_t *, natinfo_t *); 789 extern int ipf_nat6_newdivert(fr_info_t *, nat_t *, natinfo_t *); 790 extern int ipf_nat6_ruleaddrinit(ipf_main_softc_t *, ipf_nat_softc_t *, ipnat_t *); 791 792 #endif 793 794 795 #endif /* __IP_NAT_H__ */ 796