ip_fil.h revision 57096
1/* 2 * Copyright (C) 1993-1998 by Darren Reed. 3 * 4 * Redistribution and use in source and binary forms are permitted 5 * provided that this notice is preserved and due credit is given 6 * to the original author and the contributors. 7 * 8 * @(#)ip_fil.h 1.35 6/5/96 9 * $Id: ip_fil.h,v 2.3.2.7 2000/01/27 08:49:41 darrenr Exp $ 10 */ 11 12#ifndef __IP_FIL_H__ 13#define __IP_FIL_H__ 14 15/* 16 * Pathnames for various IP Filter control devices. Used by LKM 17 * and userland, so defined here. 18 */ 19#define IPNAT_NAME "/dev/ipnat" 20#define IPSTATE_NAME "/dev/ipstate" 21#define IPAUTH_NAME "/dev/ipauth" 22 23#ifndef SOLARIS 24# define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) 25#endif 26 27#if defined(KERNEL) && !defined(_KERNEL) 28# define _KERNEL 29#endif 30 31#ifndef __P 32# ifdef __STDC__ 33# define __P(x) x 34# else 35# define __P(x) () 36# endif 37#endif 38 39#if defined(__STDC__) || defined(__GNUC__) 40# define SIOCADAFR _IOW('r', 60, struct frentry) 41# define SIOCRMAFR _IOW('r', 61, struct frentry) 42# define SIOCSETFF _IOW('r', 62, u_int) 43# define SIOCGETFF _IOR('r', 63, u_int) 44# define SIOCGETFS _IOR('r', 64, struct friostat) 45# define SIOCIPFFL _IOWR('r', 65, int) 46# define SIOCIPFFB _IOR('r', 66, int) 47# define SIOCADIFR _IOW('r', 67, struct frentry) 48# define SIOCRMIFR _IOW('r', 68, struct frentry) 49# define SIOCSWAPA _IOR('r', 69, u_int) 50# define SIOCINAFR _IOW('r', 70, struct frentry) 51# define SIOCINIFR _IOW('r', 71, struct frentry) 52# define SIOCFRENB _IOW('r', 72, u_int) 53# define SIOCFRSYN _IOW('r', 73, u_int) 54# define SIOCFRZST _IOWR('r', 74, struct friostat) 55# define SIOCZRLST _IOWR('r', 75, struct frentry) 56# define SIOCAUTHW _IOWR('r', 76, struct fr_info) 57# define SIOCAUTHR _IOWR('r', 77, struct fr_info) 58# define SIOCATHST _IOWR('r', 78, struct fr_authstat) 59#else 60# define SIOCADAFR _IOW(r, 60, struct frentry) 61# define SIOCRMAFR _IOW(r, 61, struct frentry) 62# define SIOCSETFF _IOW(r, 62, u_int) 63# define SIOCGETFF _IOR(r, 63, u_int) 64# define SIOCGETFS _IOR(r, 64, struct friostat) 65# define SIOCIPFFL _IOWR(r, 65, int) 66# define SIOCIPFFB _IOR(r, 66, int) 67# define SIOCADIFR _IOW(r, 67, struct frentry) 68# define SIOCRMIFR _IOW(r, 68, struct frentry) 69# define SIOCSWAPA _IOR(r, 69, u_int) 70# define SIOCINAFR _IOW(r, 70, struct frentry) 71# define SIOCINIFR _IOW(r, 71, struct frentry) 72# define SIOCFRENB _IOW(r, 72, u_int) 73# define SIOCFRSYN _IOW(r, 73, u_int) 74# define SIOCFRZST _IOWR(r, 74, struct friostat) 75# define SIOCZRLST _IOWR(r, 75, struct frentry) 76# define SIOCAUTHW _IOWR(r, 76, struct fr_info) 77# define SIOCAUTHR _IOWR(r, 77, struct fr_info) 78# define SIOCATHST _IOWR(r, 78, struct fr_authstat) 79#endif 80#define SIOCADDFR SIOCADAFR 81#define SIOCDELFR SIOCRMAFR 82#define SIOCINSFR SIOCINAFR 83 84typedef struct fr_ip { 85 u_char fi_v:4; /* IP version */ 86 u_char fi_fl:4; /* packet flags */ 87 u_char fi_tos; /* IP packet TOS */ 88 u_char fi_ttl; /* IP packet TTL */ 89 u_char fi_p; /* IP packet protocol */ 90 struct in_addr fi_src; /* source address from packet */ 91 struct in_addr fi_dst; /* destination address from packet */ 92 u_32_t fi_optmsk; /* bitmask composed from IP options */ 93 u_short fi_secmsk; /* bitmask composed from IP security options */ 94 u_short fi_auth; /* authentication code from IP sec. options */ 95} fr_ip_t; 96 97#define FI_OPTIONS (FF_OPTIONS >> 24) 98#define FI_TCPUDP (FF_TCPUDP >> 24) /* TCP/UCP implied comparison*/ 99#define FI_FRAG (FF_FRAG >> 24) 100#define FI_SHORT (FF_SHORT >> 24) 101#define FI_CMP (FI_OPTIONS|FI_TCPUDP|FI_SHORT) 102 103/* 104 * These are both used by the state and NAT code to indicate that one port or 105 * the other should be treated as a wildcard. 106 */ 107#define FI_W_SPORT 0x00000100 108#define FI_W_DPORT 0x00000200 109#define FI_WILD (FI_W_SPORT|FI_W_DPORT) 110 111typedef struct fr_info { 112 void *fin_ifp; /* interface packet is `on' */ 113 struct fr_ip fin_fi; /* IP Packet summary */ 114 u_short fin_data[2]; /* TCP/UDP ports, ICMP code/type */ 115 u_char fin_out; /* in or out ? 1 == out, 0 == in */ 116 u_char fin_rev; /* state only: 1 = reverse */ 117 u_short fin_hlen; /* length of IP header in bytes */ 118 u_char fin_tcpf; /* TCP header flags (SYN, ACK, etc) */ 119 /* From here on is packet specific */ 120 u_char fin_icode; /* ICMP error to return */ 121 u_short fin_rule; /* rule # last matched */ 122 u_short fin_group; /* group number, -1 for none */ 123 struct frentry *fin_fr; /* last matching rule */ 124 char *fin_dp; /* start of data past IP header */ 125 u_short fin_dlen; /* length of data portion of packet */ 126 u_short fin_id; /* IP packet id field */ 127 void *fin_mp; /* pointer to pointer to mbuf */ 128#if SOLARIS && defined(_KERNEL) 129 void *fin_qfm; /* pointer to mblk where pkt starts */ 130 void *fin_qif; 131#endif 132} fr_info_t; 133 134/* 135 * Size for compares on fr_info structures 136 */ 137#define FI_CSIZE offsetof(fr_info_t, fin_icode) 138 139/* 140 * Size for copying cache fr_info structure 141 */ 142#define FI_COPYSIZE offsetof(fr_info_t, fin_dp) 143 144typedef struct frdest { 145 void *fd_ifp; 146 struct in_addr fd_ip; 147 char fd_ifname[IFNAMSIZ]; 148} frdest_t; 149 150typedef struct frentry { 151 struct frentry *fr_next; 152 u_short fr_group; /* group to which this rule belongs */ 153 u_short fr_grhead; /* group # which this rule starts */ 154 struct frentry *fr_grp; 155 int fr_ref; /* reference count - for grouping */ 156 void *fr_ifa; 157#if BSD >= 199306 158 void *fr_oifa; 159#endif 160 /* 161 * These are only incremented when a packet matches this rule and 162 * it is the last match 163 */ 164 U_QUAD_T fr_hits; 165 U_QUAD_T fr_bytes; 166 /* 167 * Fields after this may not change whilst in the kernel. 168 */ 169 struct fr_ip fr_ip; 170 struct fr_ip fr_mip; /* mask structure */ 171 172 u_char fr_tcpfm; /* tcp flags mask */ 173 u_char fr_tcpf; /* tcp flags */ 174 175 u_short fr_icmpm; /* data for ICMP packets (mask) */ 176 u_short fr_icmp; 177 178 u_char fr_scmp; /* data for port comparisons */ 179 u_char fr_dcmp; 180 u_short fr_dport; 181 u_short fr_sport; 182 u_short fr_stop; /* top port for <> and >< */ 183 u_short fr_dtop; /* top port for <> and >< */ 184 u_32_t fr_flags; /* per-rule flags && options (see below) */ 185 u_short fr_skip; /* # of rules to skip */ 186 u_short fr_loglevel; /* syslog log facility + priority */ 187 int (*fr_func) __P((int, ip_t *, fr_info_t *)); /* call this function */ 188 char fr_icode; /* return ICMP code */ 189 char fr_ifname[IFNAMSIZ]; 190#if BSD >= 199306 191 char fr_oifname[IFNAMSIZ]; 192#endif 193 struct frdest fr_tif; /* "to" interface */ 194 struct frdest fr_dif; /* duplicate packet interfaces */ 195} frentry_t; 196 197#define fr_proto fr_ip.fi_p 198#define fr_ttl fr_ip.fi_ttl 199#define fr_tos fr_ip.fi_tos 200#define fr_dst fr_ip.fi_dst 201#define fr_src fr_ip.fi_src 202#define fr_dmsk fr_mip.fi_dst 203#define fr_smsk fr_mip.fi_src 204 205#ifndef offsetof 206#define offsetof(t,m) (int)((&((t *)0L)->m)) 207#endif 208#define FR_CMPSIZ (sizeof(struct frentry) - offsetof(frentry_t, fr_ip)) 209 210/* 211 * fr_flags 212 */ 213#define FR_BLOCK 0x00001 /* do not allow packet to pass */ 214#define FR_PASS 0x00002 /* allow packet to pass */ 215#define FR_OUTQUE 0x00004 /* outgoing packets */ 216#define FR_INQUE 0x00008 /* ingoing packets */ 217#define FR_LOG 0x00010 /* Log */ 218#define FR_LOGB 0x00011 /* Log-fail */ 219#define FR_LOGP 0x00012 /* Log-pass */ 220#define FR_LOGBODY 0x00020 /* Log the body */ 221#define FR_LOGFIRST 0x00040 /* Log the first byte if state held */ 222#define FR_RETRST 0x00080 /* Return TCP RST packet - reset connection */ 223#define FR_RETICMP 0x00100 /* Return ICMP unreachable packet */ 224#define FR_FAKEICMP 0x00180 /* Return ICMP unreachable with fake source */ 225#define FR_NOMATCH 0x00200 /* no match occured */ 226#define FR_ACCOUNT 0x00400 /* count packet bytes */ 227#define FR_KEEPFRAG 0x00800 /* keep fragment information */ 228#define FR_KEEPSTATE 0x01000 /* keep `connection' state information */ 229#define FR_INACTIVE 0x02000 230#define FR_QUICK 0x04000 /* match & stop processing list */ 231#define FR_FASTROUTE 0x08000 /* bypass normal routing */ 232#define FR_CALLNOW 0x10000 /* call another function (fr_func) if matches */ 233#define FR_DUP 0x20000 /* duplicate packet */ 234#define FR_LOGORBLOCK 0x40000 /* block the packet if it can't be logged */ 235#define FR_NOTSRCIP 0x80000 /* not the src IP# */ 236#define FR_NOTDSTIP 0x100000 /* not the dst IP# */ 237#define FR_AUTH 0x200000 /* use authentication */ 238#define FR_PREAUTH 0x400000 /* require preauthentication */ 239#define FR_DONTCACHE 0x800000 /* don't cache the result */ 240 241#define FR_LOGMASK (FR_LOG|FR_LOGP|FR_LOGB) 242#define FR_RETMASK (FR_RETICMP|FR_RETRST|FR_FAKEICMP) 243 244/* 245 * These correspond to #define's for FI_* and are stored in fr_flags 246 */ 247#define FF_OPTIONS 0x01000000 248#define FF_TCPUDP 0x02000000 249#define FF_FRAG 0x04000000 250#define FF_SHORT 0x08000000 251/* 252 * recognized flags for SIOCGETFF and SIOCSETFF, and get put in fr_flags 253 */ 254#define FF_LOGPASS 0x10000000 255#define FF_LOGBLOCK 0x20000000 256#define FF_LOGNOMATCH 0x40000000 257#define FF_LOGGING (FF_LOGPASS|FF_LOGBLOCK|FF_LOGNOMATCH) 258#define FF_BLOCKNONIP 0x80000000 /* Solaris2 Only */ 259 260#define FR_NONE 0 261#define FR_EQUAL 1 262#define FR_NEQUAL 2 263#define FR_LESST 3 264#define FR_GREATERT 4 265#define FR_LESSTE 5 266#define FR_GREATERTE 6 267#define FR_OUTRANGE 7 268#define FR_INRANGE 8 269 270typedef struct filterstats { 271 u_long fr_pass; /* packets allowed */ 272 u_long fr_block; /* packets denied */ 273 u_long fr_nom; /* packets which don't match any rule */ 274 u_long fr_short; /* packets which are short */ 275 u_long fr_ppkl; /* packets allowed and logged */ 276 u_long fr_bpkl; /* packets denied and logged */ 277 u_long fr_npkl; /* packets unmatched and logged */ 278 u_long fr_pkl; /* packets logged */ 279 u_long fr_skip; /* packets to be logged but buffer full */ 280 u_long fr_ret; /* packets for which a return is sent */ 281 u_long fr_acct; /* packets for which counting was performed */ 282 u_long fr_bnfr; /* bad attempts to allocate fragment state */ 283 u_long fr_nfr; /* new fragment state kept */ 284 u_long fr_cfr; /* add new fragment state but complete pkt */ 285 u_long fr_bads; /* bad attempts to allocate packet state */ 286 u_long fr_ads; /* new packet state kept */ 287 u_long fr_chit; /* cached hit */ 288 u_long fr_tcpbad; /* TCP checksum check failures */ 289 u_long fr_pull[2]; /* good and bad pullup attempts */ 290#if SOLARIS 291 u_long fr_notdata; /* PROTO/PCPROTO that have no data */ 292 u_long fr_nodata; /* mblks that have no data */ 293 u_long fr_bad; /* bad IP packets to the filter */ 294 u_long fr_notip; /* packets passed through no on ip queue */ 295 u_long fr_drop; /* packets dropped - no info for them! */ 296#endif 297} filterstats_t; 298 299/* 300 * For SIOCGETFS 301 */ 302typedef struct friostat { 303 struct filterstats f_st[2]; 304 struct frentry *f_fin[2]; 305 struct frentry *f_fout[2]; 306 struct frentry *f_acctin[2]; 307 struct frentry *f_acctout[2]; 308 struct frentry *f_auth; 309 struct frgroup *f_groups[3][2]; 310 u_long f_froute[2]; 311 int f_defpass; /* default pass - from fr_pass */ 312 char f_active; /* 1 or 0 - active rule set */ 313 char f_running; /* 1 if running, else 0 */ 314 char f_logging; /* 1 if enabled, else 0 */ 315#if !SOLARIS && defined(sun) 316 char f_version[25]; /* version string */ 317#else 318 char f_version[32]; /* version string */ 319#endif 320} friostat_t; 321 322typedef struct optlist { 323 u_short ol_val; 324 int ol_bit; 325} optlist_t; 326 327 328/* 329 * Group list structure. 330 */ 331typedef struct frgroup { 332 u_short fg_num; 333 struct frgroup *fg_next; 334 struct frentry *fg_head; 335 struct frentry **fg_start; 336} frgroup_t; 337 338 339/* 340 * Log structure. Each packet header logged is prepended by one of these. 341 * Following this in the log records read from the device will be an ipflog 342 * structure which is then followed by any packet data. 343 */ 344typedef struct iplog { 345 u_32_t ipl_magic; 346 u_int ipl_count; 347 u_long ipl_sec; 348 u_long ipl_usec; 349 size_t ipl_dsize; 350 struct iplog *ipl_next; 351} iplog_t; 352 353#define IPL_MAGIC 0x49504c4d /* 'IPLM' */ 354 355typedef struct ipflog { 356#if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \ 357 (defined(OpenBSD) && (OpenBSD >= 199603)) 358 u_char fl_ifname[IFNAMSIZ]; 359#else 360 u_int fl_unit; 361 u_char fl_ifname[4]; 362#endif 363 u_char fl_plen; /* extra data after hlen */ 364 u_char fl_hlen; /* length of IP headers saved */ 365 u_short fl_rule; /* assume never more than 64k rules, total */ 366 u_short fl_group; 367 u_short fl_loglevel; /* syslog log level */ 368 u_32_t fl_flags; 369 u_32_t fl_lflags; 370} ipflog_t; 371 372 373#ifndef ICMP_UNREACH_FILTER 374# define ICMP_UNREACH_FILTER 13 375#endif 376 377#ifndef IPF_LOGGING 378# define IPF_LOGGING 0 379#endif 380#ifndef IPF_DEFAULT_PASS 381# define IPF_DEFAULT_PASS FR_PASS 382#endif 383 384#define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h))) 385#define IPLLOGSIZE 8192 386 387/* 388 * Device filenames for reading log information. Use ipf on Solaris2 because 389 * ipl is already a name used by something else. 390 */ 391#ifndef IPL_NAME 392# if SOLARIS 393# define IPL_NAME "/dev/ipf" 394# else 395# define IPL_NAME "/dev/ipl" 396# endif 397#endif 398#define IPL_NAT IPNAT_NAME 399#define IPL_STATE IPSTATE_NAME 400#define IPL_AUTH IPAUTH_NAME 401 402#define IPL_LOGIPF 0 /* Minor device #'s for accessing logs */ 403#define IPL_LOGNAT 1 404#define IPL_LOGSTATE 2 405#define IPL_LOGAUTH 3 406#define IPL_LOGMAX 3 407 408#if !defined(CDEV_MAJOR) && defined (__FreeBSD_version) && \ 409 (__FreeBSD_version >= 220000) 410# define CDEV_MAJOR 79 411#endif 412 413/* 414 * Post NetBSD 1.2 has the PFIL interface for packet filters. This turns 415 * on those hooks. We don't need any special mods in non-IP Filter code 416 * with this! 417 */ 418#if (defined(NetBSD) && (NetBSD > 199609) && (NetBSD <= 1991011)) || \ 419 (defined(NetBSD1_2) && NetBSD1_2 > 1) 420# if (NetBSD >= 199905) 421# define PFIL_HOOKS 422# endif 423# ifdef PFIL_HOOKS 424# define NETBSD_PF 425# endif 426#endif 427 428 429#ifndef _KERNEL 430extern int fr_check __P((ip_t *, int, void *, int, mb_t **)); 431extern int (*fr_checkp) __P((ip_t *, int, void *, int, mb_t **)); 432extern int send_reset __P((ip_t *, struct ifnet *)); 433extern int icmp_error __P((ip_t *, struct ifnet *)); 434extern int ipf_log __P((void)); 435extern int ipfr_fastroute __P((ip_t *, fr_info_t *, frdest_t *)); 436extern struct ifnet *get_unit __P((char *)); 437# if defined(__NetBSD__) || defined(__OpenBSD__) || \ 438 (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000) 439extern int iplioctl __P((dev_t, u_long, caddr_t, int)); 440# else 441extern int iplioctl __P((dev_t, int, caddr_t, int)); 442# endif 443extern int iplopen __P((dev_t, int)); 444extern int iplclose __P((dev_t, int)); 445#else /* #ifndef _KERNEL */ 446# if defined(__NetBSD__) && defined(PFIL_HOOKS) 447extern void ipfilterattach __P((int)); 448# endif 449extern int iplattach __P((void)); 450extern int ipl_enable __P((void)); 451extern int ipl_disable __P((void)); 452extern void ipflog_init __P((void)); 453extern int ipflog_clear __P((minor_t)); 454extern int ipflog_read __P((minor_t, struct uio *)); 455extern int ipflog __P((u_int, ip_t *, fr_info_t *, mb_t *)); 456extern int ipllog __P((int, fr_info_t *, void **, size_t *, int *, int)); 457# if SOLARIS 458extern int fr_check __P((ip_t *, int, void *, int, qif_t *, mb_t **)); 459extern int (*fr_checkp) __P((ip_t *, int, void *, 460 int, qif_t *, mb_t **)); 461extern int icmp_error __P((ip_t *, int, int, qif_t *, struct in_addr)); 462# if SOLARIS2 >= 7 463extern int iplioctl __P((dev_t, int, intptr_t, int, cred_t *, int *)); 464# else 465extern int iplioctl __P((dev_t, int, int *, int, cred_t *, int *)); 466# endif 467extern int iplopen __P((dev_t *, int, int, cred_t *)); 468extern int iplclose __P((dev_t, int, int, cred_t *)); 469extern int ipfsync __P((void)); 470extern int send_reset __P((fr_info_t *, ip_t *, qif_t *)); 471extern int ipfr_fastroute __P((qif_t *, ip_t *, mblk_t *, mblk_t **, 472 fr_info_t *, frdest_t *)); 473extern void copyin_mblk __P((mblk_t *, size_t, size_t, char *)); 474extern void copyout_mblk __P((mblk_t *, size_t, size_t, char *)); 475extern int fr_qin __P((queue_t *, mblk_t *)); 476extern int fr_qout __P((queue_t *, mblk_t *)); 477# ifdef IPFILTER_LOG 478extern int iplread __P((dev_t, struct uio *, cred_t *)); 479# endif 480# else /* SOLARIS */ 481extern int fr_check __P((ip_t *, int, void *, int, mb_t **)); 482extern int (*fr_checkp) __P((ip_t *, int, void *, int, mb_t **)); 483# ifdef linux 484extern int send_reset __P((tcpiphdr_t *, struct ifnet *)); 485# else 486extern int send_reset __P((fr_info_t *, struct ip *)); 487extern int send_icmp_err __P((ip_t *, int, int, void *, struct in_addr)); 488# endif 489extern int ipfr_fastroute __P((mb_t *, fr_info_t *, frdest_t *)); 490extern size_t mbufchainlen __P((mb_t *)); 491# ifdef __sgi 492# include <sys/cred.h> 493extern int iplioctl __P((dev_t, int, caddr_t, int, cred_t *, int *)); 494extern int iplopen __P((dev_t *, int, int, cred_t *)); 495extern int iplclose __P((dev_t, int, int, cred_t *)); 496extern int iplread __P((dev_t, struct uio *, cred_t *)); 497extern int ipfsync __P((void)); 498extern int ipfilter_sgi_attach __P((void)); 499extern void ipfilter_sgi_detach __P((void)); 500extern void ipfilter_sgi_intfsync __P((void)); 501# else 502# ifdef IPFILTER_LKM 503extern int iplidentify __P((char *)); 504# endif 505# if (_BSDI_VERSION >= 199510) || (__FreeBSD_version >= 220000) || \ 506 (NetBSD >= 199511) || defined(__OpenBSD__) 507# if defined(__NetBSD__) || (_BSDI_VERSION >= 199701) || \ 508 defined(__OpenBSD__) || (__FreeBSD_version >= 300000) 509extern int iplioctl __P((dev_t, u_long, caddr_t, int, struct proc *)); 510# else 511extern int iplioctl __P((dev_t, int, caddr_t, int, struct proc *)); 512# endif 513extern int iplopen __P((dev_t, int, int, struct proc *)); 514extern int iplclose __P((dev_t, int, int, struct proc *)); 515# else 516# ifndef linux 517extern int iplopen __P((dev_t, int)); 518extern int iplclose __P((dev_t, int)); 519extern int iplioctl __P((dev_t, int, caddr_t, int)); 520# else 521extern int iplioctl(struct inode *, struct file *, u_int, u_long); 522extern int iplopen __P((struct inode *, struct file *)); 523extern void iplclose __P((struct inode *, struct file *)); 524# endif /* !linux */ 525# endif /* (_BSDI_VERSION >= 199510) */ 526# if BSD >= 199306 527extern int iplread __P((dev_t, struct uio *, int)); 528# else 529# ifndef linux 530extern int iplread __P((dev_t, struct uio *)); 531# else 532extern int iplread(struct inode *, struct file *, char *, int); 533# endif /* !linux */ 534# endif /* BSD >= 199306 */ 535# endif /* __ sgi */ 536# endif /* SOLARIS */ 537#endif /* #ifndef _KERNEL */ 538 539extern void fixskip __P((frentry_t **, frentry_t *, int)); 540extern int countbits __P((u_32_t)); 541extern int ipldetach __P((void)); 542extern u_short fr_tcpsum __P((mb_t *, ip_t *, tcphdr_t *)); 543extern int fr_scanlist __P((u_32_t, ip_t *, fr_info_t *, void *)); 544extern u_short ipf_cksum __P((u_short *, int)); 545extern int fr_copytolog __P((int, char *, int)); 546extern void fr_forgetifp __P((void *)); 547extern int frflush __P((minor_t, int)); 548extern void frsync __P((void)); 549extern frgroup_t *fr_addgroup __P((u_int, frentry_t *, minor_t, int)); 550extern frgroup_t *fr_findgroup __P((u_int, u_32_t, minor_t, int, frgroup_t ***)); 551extern void fr_delgroup __P((u_int, u_32_t, minor_t, int)); 552extern void fr_makefrip __P((int, ip_t *, fr_info_t *)); 553extern int fr_ifpaddr __P((void *, struct in_addr *)); 554extern char *memstr __P((char *, char *, int, int)); 555extern int ipl_unreach; 556extern int fr_running; 557extern u_long ipl_frouteok[2]; 558extern int fr_pass; 559extern int fr_flags; 560extern int fr_active; 561extern fr_info_t frcache[2]; 562extern char ipfilter_version[]; 563#ifdef IPFILTER_LOG 564extern iplog_t **iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1]; 565extern size_t iplused[IPL_LOGMAX + 1]; 566#endif 567extern struct frentry *ipfilter[2][2], *ipacct[2][2]; 568extern struct frgroup *ipfgroups[3][2]; 569extern struct filterstats frstats[]; 570 571#endif /* __IP_FIL_H__ */ 572