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Diffstat (limited to 'sys/netinet/ip_fil.h')
| -rw-r--r-- | sys/netinet/ip_fil.h | 566 |
1 files changed, 566 insertions, 0 deletions
diff --git a/sys/netinet/ip_fil.h b/sys/netinet/ip_fil.h new file mode 100644 index 0000000..aef96ca --- /dev/null +++ b/sys/netinet/ip_fil.h @@ -0,0 +1,566 @@ +/* + * 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 + * $Id: ip_fil.h,v 2.3.2.4 1999/10/15 13:42:37 darrenr Exp $ + * $FreeBSD$ + */ + +#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 + +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 */ + 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_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! */ +#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_active; /* 1 or 0 - active rule set */ + int f_defpass; /* default pass - from fr_pass */ + int f_running; /* 1 if running, else 0 */ + int f_logging; /* 1 if enabled, else 0 */ + char f_version[32]; /* version string */ +} 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; + + +#ifndef ICMP_UNREACH_FILTER +# define ICMP_UNREACH_FILTER 13 +#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 <sys/cred.h> +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 ipl_inited; +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__ */ |
