/* $OpenBSD: ip_fil.h,v 1.18 2000/04/05 05:35:27 kjell Exp $ */ /* * Copyright (C) 1993-1998 by Darren Reed. * * Redistribution and use in source and binary forms are permitted * provided that this notice is preserved and due credit is given * to the original author and the contributors. * * @(#)ip_fil.h 1.35 6/5/96 * $IPFilter: ip_fil.h,v 2.3.2.9 2000/03/08 11:43:30 darrenr Exp $ */ #ifndef __IP_FIL_H__ #define __IP_FIL_H__ /* * Pathnames for various IP Filter control devices. Used by LKM * and userland, so defined here. */ #define IPNAT_NAME "/dev/ipnat" #define IPSTATE_NAME "/dev/ipstate" #define IPAUTH_NAME "/dev/ipauth" #ifndef SOLARIS # define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) #endif #if defined(KERNEL) && !defined(_KERNEL) # define _KERNEL #endif #ifndef __P # ifdef __STDC__ # define __P(x) x # else # define __P(x) () # endif #endif #if defined(__STDC__) || defined(__GNUC__) # define SIOCADAFR _IOW('r', 60, struct frentry) # define SIOCRMAFR _IOW('r', 61, struct frentry) # define SIOCSETFF _IOW('r', 62, u_int) # define SIOCGETFF _IOR('r', 63, u_int) # define SIOCGETFS _IOR('r', 64, struct friostat) # define SIOCIPFFL _IOWR('r', 65, int) # define SIOCIPFFB _IOR('r', 66, int) # define SIOCADIFR _IOW('r', 67, struct frentry) # define SIOCRMIFR _IOW('r', 68, struct frentry) # define SIOCSWAPA _IOR('r', 69, u_int) # define SIOCINAFR _IOW('r', 70, struct frentry) # define SIOCINIFR _IOW('r', 71, struct frentry) # define SIOCFRENB _IOW('r', 72, u_int) # define SIOCFRSYN _IOW('r', 73, u_int) # define SIOCFRZST _IOWR('r', 74, struct friostat) # define SIOCZRLST _IOWR('r', 75, struct frentry) # define SIOCAUTHW _IOWR('r', 76, struct fr_info) # define SIOCAUTHR _IOWR('r', 77, struct fr_info) # define SIOCATHST _IOWR('r', 78, struct fr_authstat) #else # define SIOCADAFR _IOW(r, 60, struct frentry) # define SIOCRMAFR _IOW(r, 61, struct frentry) # define SIOCSETFF _IOW(r, 62, u_int) # define SIOCGETFF _IOR(r, 63, u_int) # define SIOCGETFS _IOR(r, 64, struct friostat) # define SIOCIPFFL _IOWR(r, 65, int) # define SIOCIPFFB _IOR(r, 66, int) # define SIOCADIFR _IOW(r, 67, struct frentry) # define SIOCRMIFR _IOW(r, 68, struct frentry) # define SIOCSWAPA _IOR(r, 69, u_int) # define SIOCINAFR _IOW(r, 70, struct frentry) # define SIOCINIFR _IOW(r, 71, struct frentry) # define SIOCFRENB _IOW(r, 72, u_int) # define SIOCFRSYN _IOW(r, 73, u_int) # define SIOCFRZST _IOWR(r, 74, struct friostat) # define SIOCZRLST _IOWR(r, 75, struct frentry) # define SIOCAUTHW _IOWR(r, 76, struct fr_info) # define SIOCAUTHR _IOWR(r, 77, struct fr_info) # define SIOCATHST _IOWR(r, 78, struct fr_authstat) #endif #define SIOCADDFR SIOCADAFR #define SIOCDELFR SIOCRMAFR #define SIOCINSFR SIOCINAFR typedef struct fr_ip { u_char fi_v:4; /* IP version */ u_char fi_fl:4; /* packet flags */ u_char fi_tos; /* IP packet TOS */ u_char fi_ttl; /* IP packet TTL */ u_char fi_p; /* IP packet protocol */ struct in_addr fi_src; /* source address from packet */ struct in_addr fi_dst; /* destination address from packet */ u_32_t fi_optmsk; /* bitmask composed from IP options */ u_short fi_secmsk; /* bitmask composed from IP security options */ u_short fi_auth; /* authentication code from IP sec. options */ } fr_ip_t; #define FI_OPTIONS (FF_OPTIONS >> 24) #define FI_TCPUDP (FF_TCPUDP >> 24) /* TCP/UCP implied comparison*/ #define FI_FRAG (FF_FRAG >> 24) #define FI_SHORT (FF_SHORT >> 24) #define FI_CMP (FI_OPTIONS|FI_TCPUDP|FI_SHORT) /* * These are both used by the state and NAT code to indicate that one port or * the other should be treated as a wildcard. */ #define FI_W_SPORT 0x00000100 #define FI_W_DPORT 0x00000200 #define FI_WILD (FI_W_SPORT|FI_W_DPORT) typedef struct fr_info { void *fin_ifp; /* interface packet is `on' */ struct fr_ip fin_fi; /* IP Packet summary */ u_short fin_data[2]; /* TCP/UDP ports, ICMP code/type */ u_char fin_out; /* in or out ? 1 == out, 0 == in */ u_char fin_rev; /* state only: 1 = reverse */ u_short fin_hlen; /* length of IP header in bytes */ u_char fin_tcpf; /* TCP header flags (SYN, ACK, etc) */ /* From here on is packet specific */ u_char fin_icode; /* ICMP error to return */ u_short fin_rule; /* rule # last matched */ u_short fin_group; /* group number, -1 for none */ struct frentry *fin_fr; /* last matching rule */ char *fin_dp; /* start of data past IP header */ u_short fin_dlen; /* length of data portion of packet */ u_short fin_id; /* IP packet id field */ void *fin_mp; /* pointer to pointer to mbuf */ #if SOLARIS && defined(_KERNEL) void *fin_qfm; /* pointer to mblk where pkt starts */ void *fin_qif; #endif } fr_info_t; /* * Size for compares on fr_info structures */ #define FI_CSIZE offsetof(fr_info_t, fin_icode) /* * Size for copying cache fr_info structure */ #define FI_COPYSIZE offsetof(fr_info_t, fin_dp) typedef struct frdest { void *fd_ifp; struct in_addr fd_ip; char fd_ifname[IFNAMSIZ]; } frdest_t; typedef struct frentry { struct frentry *fr_next; u_short fr_group; /* group to which this rule belongs */ u_short fr_grhead; /* group # which this rule starts */ struct frentry *fr_grp; int fr_ref; /* reference count - for grouping */ void *fr_ifa; #if BSD >= 199306 void *fr_oifa; #endif /* * These are only incremented when a packet matches this rule and * it is the last match */ U_QUAD_T fr_hits; U_QUAD_T fr_bytes; /* * Fields after this may not change whilst in the kernel. */ struct fr_ip fr_ip; struct fr_ip fr_mip; /* mask structure */ u_char fr_tcpfm; /* tcp flags mask */ u_char fr_tcpf; /* tcp flags */ u_short fr_icmpm; /* data for ICMP packets (mask) */ u_short fr_icmp; u_char fr_scmp; /* data for port comparisons */ u_char fr_dcmp; u_short fr_dport; u_short fr_sport; u_short fr_stop; /* top port for <> and >< */ u_short fr_dtop; /* top port for <> and >< */ u_32_t fr_flags; /* per-rule flags && options (see below) */ u_short fr_skip; /* # of rules to skip */ u_short fr_loglevel; /* syslog log facility + priority */ int (*fr_func) __P((int, ip_t *, fr_info_t *)); /* call this function */ u_char fr_icode; /* return ICMP code */ char fr_ifname[IFNAMSIZ]; #if BSD >= 199306 char fr_oifname[IFNAMSIZ]; #endif struct frdest fr_tif; /* "to" interface */ struct frdest fr_dif; /* duplicate packet interfaces */ } frentry_t; #define fr_proto fr_ip.fi_p #define fr_ttl fr_ip.fi_ttl #define fr_tos fr_ip.fi_tos #define fr_dst fr_ip.fi_dst #define fr_src fr_ip.fi_src #define fr_dmsk fr_mip.fi_dst #define fr_smsk fr_mip.fi_src #ifndef offsetof #define offsetof(t,m) (int)((&((t *)0L)->m)) #endif #define FR_CMPSIZ (sizeof(struct frentry) - offsetof(frentry_t, fr_ip)) /* * fr_flags */ #define FR_BLOCK 0x00001 /* do not allow packet to pass */ #define FR_PASS 0x00002 /* allow packet to pass */ #define FR_OUTQUE 0x00004 /* outgoing packets */ #define FR_INQUE 0x00008 /* ingoing packets */ #define FR_LOG 0x00010 /* Log */ #define FR_LOGB 0x00011 /* Log-fail */ #define FR_LOGP 0x00012 /* Log-pass */ #define FR_LOGBODY 0x00020 /* Log the body */ #define FR_LOGFIRST 0x00040 /* Log the first byte if state held */ #define FR_RETRST 0x00080 /* Return TCP RST packet - reset connection */ #define FR_RETICMP 0x00100 /* Return ICMP unreachable packet */ #define FR_FAKEICMP 0x00180 /* Return ICMP unreachable with fake source */ #define FR_NOMATCH 0x00200 /* no match occured */ #define FR_ACCOUNT 0x00400 /* count packet bytes */ #define FR_KEEPFRAG 0x00800 /* keep fragment information */ #define FR_KEEPSTATE 0x01000 /* keep `connection' state information */ #define FR_INACTIVE 0x02000 #define FR_QUICK 0x04000 /* match & stop processing list */ #define FR_FASTROUTE 0x08000 /* bypass normal routing */ #define FR_CALLNOW 0x10000 /* call another function (fr_func) if matches */ #define FR_DUP 0x20000 /* duplicate packet */ #define FR_LOGORBLOCK 0x40000 /* block the packet if it can't be logged */ #define FR_NOTSRCIP 0x80000 /* not the src IP# */ #define FR_NOTDSTIP 0x100000 /* not the dst IP# */ #define FR_AUTH 0x200000 /* use authentication */ #define FR_PREAUTH 0x400000 /* require preauthentication */ #define FR_DONTCACHE 0x800000 /* don't cache the result */ #define FR_LOGMASK (FR_LOG|FR_LOGP|FR_LOGB) #define FR_RETMASK (FR_RETICMP|FR_RETRST|FR_FAKEICMP) /* * These correspond to #define's for FI_* and are stored in fr_flags */ #define FF_OPTIONS 0x01000000 #define FF_TCPUDP 0x02000000 #define FF_FRAG 0x04000000 #define FF_SHORT 0x08000000 /* * recognized flags for SIOCGETFF and SIOCSETFF, and get put in fr_flags */ #define FF_LOGPASS 0x10000000 #define FF_LOGBLOCK 0x20000000 #define FF_LOGNOMATCH 0x40000000 #define FF_LOGGING (FF_LOGPASS|FF_LOGBLOCK|FF_LOGNOMATCH) #define FF_BLOCKNONIP 0x80000000 /* Solaris2 Only */ #define FR_NONE 0 #define FR_EQUAL 1 #define FR_NEQUAL 2 #define FR_LESST 3 #define FR_GREATERT 4 #define FR_LESSTE 5 #define FR_GREATERTE 6 #define FR_OUTRANGE 7 #define FR_INRANGE 8 typedef struct filterstats { u_long fr_pass; /* packets allowed */ u_long fr_block; /* packets denied */ u_long fr_nom; /* packets which don't match any rule */ u_long fr_short; /* packets which are short */ u_long fr_ppkl; /* packets allowed and logged */ u_long fr_bpkl; /* packets denied and logged */ u_long fr_npkl; /* packets unmatched and logged */ u_long fr_pkl; /* packets logged */ u_long fr_skip; /* packets to be logged but buffer full */ u_long fr_ret; /* packets for which a return is sent */ u_long fr_acct; /* packets for which counting was performed */ u_long fr_bnfr; /* bad attempts to allocate fragment state */ u_long fr_nfr; /* new fragment state kept */ u_long fr_cfr; /* add new fragment state but complete pkt */ u_long fr_bads; /* bad attempts to allocate packet state */ u_long fr_ads; /* new packet state kept */ u_long fr_chit; /* cached hit */ u_long fr_tcpbad; /* TCP checksum check failures */ u_long fr_pull[2]; /* good and bad pullup attempts */ #if SOLARIS u_long fr_notdata; /* PROTO/PCPROTO that have no data */ u_long fr_nodata; /* mblks that have no data */ u_long fr_bad; /* bad IP packets to the filter */ u_long fr_notip; /* packets passed through no on ip queue */ u_long fr_drop; /* packets dropped - no info for them! */ u_long fr_copy; /* messages copied due to db_ref > 1 */ #endif } filterstats_t; /* * For SIOCGETFS */ typedef struct friostat { struct filterstats f_st[2]; struct frentry *f_fin[2]; struct frentry *f_fout[2]; struct frentry *f_acctin[2]; struct frentry *f_acctout[2]; struct frentry *f_auth; struct frgroup *f_groups[3][2]; u_long f_froute[2]; int f_defpass; /* default pass - from fr_pass */ char f_active; /* 1 or 0 - active rule set */ char f_running; /* 1 if running, else 0 */ char f_logging; /* 1 if enabled, else 0 */ #if !SOLARIS && defined(sun) char f_version[25]; /* version string */ #else char f_version[32]; /* version string */ #endif } friostat_t; typedef struct optlist { u_short ol_val; int ol_bit; } optlist_t; /* * Group list structure. */ typedef struct frgroup { u_short fg_num; struct frgroup *fg_next; struct frentry *fg_head; struct frentry **fg_start; } frgroup_t; /* * Log structure. Each packet header logged is prepended by one of these. * Following this in the log records read from the device will be an ipflog * structure which is then followed by any packet data. */ typedef struct iplog { u_32_t ipl_magic; u_int ipl_count; u_long ipl_sec; u_long ipl_usec; size_t ipl_dsize; struct iplog *ipl_next; } iplog_t; #define IPL_MAGIC 0x49504c4d /* 'IPLM' */ typedef struct ipflog { #if (defined(NetBSD) && (NetBSD <= 1991011) && (NetBSD >= 199603)) || \ (defined(OpenBSD) && (OpenBSD >= 199603)) u_char fl_ifname[IFNAMSIZ]; #else u_int fl_unit; u_char fl_ifname[4]; #endif u_char fl_plen; /* extra data after hlen */ u_char fl_hlen; /* length of IP headers saved */ u_short fl_rule; /* assume never more than 64k rules, total */ u_short fl_group; u_short fl_loglevel; /* syslog log level */ u_32_t fl_flags; u_32_t fl_lflags; } ipflog_t; #if !defined(__OpenBSD__) # ifndef ICMP_UNREACH_FILTER # define ICMP_UNREACH_FILTER 13 # endif #endif #ifndef IPF_LOGGING # define IPF_LOGGING 0 #endif #ifndef IPF_DEFAULT_PASS # define IPF_DEFAULT_PASS FR_PASS #endif #define IPMINLEN(i, h) ((i)->ip_len >= ((i)->ip_hl * 4 + sizeof(struct h))) #define IPLLOGSIZE 8192 /* * Device filenames for reading log information. Use ipf on Solaris2 because * ipl is already a name used by something else. */ #ifndef IPL_NAME # if SOLARIS # define IPL_NAME "/dev/ipf" # else # define IPL_NAME "/dev/ipl" # endif #endif #define IPL_NAT IPNAT_NAME #define IPL_STATE IPSTATE_NAME #define IPL_AUTH IPAUTH_NAME #define IPL_LOGIPF 0 /* Minor device #'s for accessing logs */ #define IPL_LOGNAT 1 #define IPL_LOGSTATE 2 #define IPL_LOGAUTH 3 #define IPL_LOGMAX 3 #if !defined(CDEV_MAJOR) && defined (__FreeBSD_version) && \ (__FreeBSD_version >= 220000) # define CDEV_MAJOR 79 #endif /* * Post NetBSD 1.2 has the PFIL interface for packet filters. This turns * on those hooks. We don't need any special mods in non-IP Filter code * with this! */ #if (defined(NetBSD) && (NetBSD > 199609) && (NetBSD <= 1991011)) || \ (defined(NetBSD1_2) && NetBSD1_2 > 1) # if (NetBSD >= 199905) # define PFIL_HOOKS # endif # ifdef PFIL_HOOKS # define NETBSD_PF # endif #endif #ifndef _KERNEL extern int fr_check __P((ip_t *, int, void *, int, mb_t **)); extern int (*fr_checkp) __P((ip_t *, int, void *, int, mb_t **)); extern int send_reset __P((ip_t *, struct ifnet *)); extern int icmp_error __P((ip_t *, struct ifnet *)); extern int ipf_log __P((void)); extern int ipfr_fastroute __P((ip_t *, fr_info_t *, frdest_t *)); extern struct ifnet *get_unit __P((char *)); # if defined(__NetBSD__) || defined(__OpenBSD__) || \ (_BSDI_VERSION >= 199701) || (__FreeBSD_version >= 300000) extern int iplioctl __P((dev_t, u_long, caddr_t, int)); # else extern int iplioctl __P((dev_t, int, caddr_t, int)); # endif extern int iplopen __P((dev_t, int)); extern int iplclose __P((dev_t, int)); #else /* #ifndef _KERNEL */ # if defined(__NetBSD__) && defined(PFIL_HOOKS) extern void ipfilterattach __P((int)); # endif extern int iplattach __P((void)); extern int ipl_enable __P((void)); extern int ipl_disable __P((void)); extern void ipflog_init __P((void)); extern int ipflog_clear __P((minor_t)); extern int ipflog_read __P((minor_t, struct uio *)); extern int ipflog __P((u_int, ip_t *, fr_info_t *, mb_t *)); extern int ipllog __P((int, fr_info_t *, void **, size_t *, int *, int)); # if SOLARIS extern int fr_check __P((ip_t *, int, void *, int, qif_t *, mb_t **)); extern int (*fr_checkp) __P((ip_t *, int, void *, int, qif_t *, mb_t **)); extern int icmp_error __P((ip_t *, int, int, qif_t *, struct in_addr)); # if SOLARIS2 >= 7 extern int iplioctl __P((dev_t, int, intptr_t, int, cred_t *, int *)); # else extern int iplioctl __P((dev_t, int, int *, int, cred_t *, int *)); # endif extern int iplopen __P((dev_t *, int, int, cred_t *)); extern int iplclose __P((dev_t, int, int, cred_t *)); extern int ipfsync __P((void)); extern int send_reset __P((fr_info_t *, ip_t *, qif_t *)); extern int ipfr_fastroute __P((qif_t *, ip_t *, mblk_t *, mblk_t **, fr_info_t *, frdest_t *)); extern void copyin_mblk __P((mblk_t *, size_t, size_t, char *)); extern void copyout_mblk __P((mblk_t *, size_t, size_t, char *)); extern int fr_qin __P((queue_t *, mblk_t *)); extern int fr_qout __P((queue_t *, mblk_t *)); # ifdef IPFILTER_LOG extern int iplread __P((dev_t, struct uio *, cred_t *)); # endif # else /* SOLARIS */ extern int fr_check __P((ip_t *, int, void *, int, mb_t **)); extern int (*fr_checkp) __P((ip_t *, int, void *, int, mb_t **)); # ifdef linux extern int send_reset __P((tcpiphdr_t *, struct ifnet *)); # else extern int send_reset __P((fr_info_t *, struct ip *)); extern int send_icmp_err __P((ip_t *, int, int, void *, struct in_addr)); # endif extern int ipfr_fastroute __P((mb_t *, fr_info_t *, frdest_t *)); extern size_t mbufchainlen __P((mb_t *)); # ifdef __sgi # include extern int iplioctl __P((dev_t, int, caddr_t, int, cred_t *, int *)); extern int iplopen __P((dev_t *, int, int, cred_t *)); extern int iplclose __P((dev_t, int, int, cred_t *)); extern int iplread __P((dev_t, struct uio *, cred_t *)); extern int ipfsync __P((void)); extern int ipfilter_sgi_attach __P((void)); extern void ipfilter_sgi_detach __P((void)); extern void ipfilter_sgi_intfsync __P((void)); # else # ifdef IPFILTER_LKM extern int iplidentify __P((char *)); # endif # if (_BSDI_VERSION >= 199510) || (__FreeBSD_version >= 220000) || \ (NetBSD >= 199511) || defined(__OpenBSD__) # if defined(__NetBSD__) || (_BSDI_VERSION >= 199701) || \ defined(__OpenBSD__) || (__FreeBSD_version >= 300000) extern int iplioctl __P((dev_t, u_long, caddr_t, int, struct proc *)); # else extern int iplioctl __P((dev_t, int, caddr_t, int, struct proc *)); # endif extern int iplopen __P((dev_t, int, int, struct proc *)); extern int iplclose __P((dev_t, int, int, struct proc *)); # else # ifndef linux extern int iplopen __P((dev_t, int)); extern int iplclose __P((dev_t, int)); extern int iplioctl __P((dev_t, int, caddr_t, int)); # else extern int iplioctl(struct inode *, struct file *, u_int, u_long); extern int iplopen __P((struct inode *, struct file *)); extern void iplclose __P((struct inode *, struct file *)); # endif /* !linux */ # endif /* (_BSDI_VERSION >= 199510) */ # if BSD >= 199306 extern int iplread __P((dev_t, struct uio *, int)); # else # ifndef linux extern int iplread __P((dev_t, struct uio *)); # else extern int iplread(struct inode *, struct file *, char *, int); # endif /* !linux */ # endif /* BSD >= 199306 */ # endif /* __ sgi */ # endif /* SOLARIS */ #endif /* #ifndef _KERNEL */ extern void fixskip __P((frentry_t **, frentry_t *, int)); extern int countbits __P((u_32_t)); extern int ipldetach __P((void)); extern u_short fr_tcpsum __P((mb_t *, ip_t *, tcphdr_t *)); extern int fr_scanlist __P((u_32_t, ip_t *, fr_info_t *, void *)); extern u_short ipf_cksum __P((u_short *, int)); extern int fr_copytolog __P((int, char *, int)); extern void fr_forgetifp __P((void *)); extern int frflush __P((minor_t, int)); extern void frsync __P((void)); extern frgroup_t *fr_addgroup __P((u_int, frentry_t *, minor_t, int)); extern frgroup_t *fr_findgroup __P((u_int, u_32_t, minor_t, int, frgroup_t ***)); extern void fr_delgroup __P((u_int, u_32_t, minor_t, int)); extern void fr_makefrip __P((int, ip_t *, fr_info_t *)); extern int fr_ifpaddr __P((void *, struct in_addr *)); extern char *memstr __P((char *, char *, int, int)); extern int ipl_unreach; extern int fr_running; extern u_long ipl_frouteok[2]; extern int fr_pass; extern int fr_flags; extern int fr_active; extern fr_info_t frcache[2]; extern char ipfilter_version[]; #ifdef IPFILTER_LOG extern iplog_t **iplh[IPL_LOGMAX+1], *iplt[IPL_LOGMAX+1]; extern size_t iplused[IPL_LOGMAX + 1]; #endif extern struct frentry *ipfilter[2][2], *ipacct[2][2]; extern struct frgroup *ipfgroups[3][2]; extern struct filterstats frstats[]; #endif /* __IP_FIL_H__ */