diff options
Diffstat (limited to 'contrib/ipfilter/ip_nat.h')
| -rw-r--r-- | contrib/ipfilter/ip_nat.h | 405 |
1 files changed, 271 insertions, 134 deletions
diff --git a/contrib/ipfilter/ip_nat.h b/contrib/ipfilter/ip_nat.h index 14e9d25..09cc119 100644 --- a/contrib/ipfilter/ip_nat.h +++ b/contrib/ipfilter/ip_nat.h @@ -1,68 +1,76 @@ +/* $NetBSD$ */ + /* - * Copyright (C) 1995-2001 by Darren Reed. + * Copyright (C) 1995-2001, 2003 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * @(#)ip_nat.h 1.5 2/4/96 - * $Id: ip_nat.h,v 2.17.2.32 2004/02/11 15:16:37 darrenr Exp $ + * Id: ip_nat.h,v 2.90.2.9 2005/03/28 11:09:55 darrenr Exp */ #ifndef __IP_NAT_H__ #define __IP_NAT_H__ #ifndef SOLARIS -#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) +#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) #endif #if defined(__STDC__) || defined(__GNUC__) -#define SIOCADNAT _IOW('r', 60, struct ipnat *) -#define SIOCRMNAT _IOW('r', 61, struct ipnat *) -#define SIOCGNATS _IOWR('r', 62, struct natstat *) -#define SIOCGNATL _IOWR('r', 63, struct natlookup *) +#define SIOCADNAT _IOW('r', 60, struct ipfobj) +#define SIOCRMNAT _IOW('r', 61, struct ipfobj) +#define SIOCGNATS _IOWR('r', 62, struct ipfobj) +#define SIOCGNATL _IOWR('r', 63, struct ipfobj) +#define SIOCPROXY _IOWR('r', 64, struct ap_control) #else -#define SIOCADNAT _IOW(r, 60, struct ipnat *) -#define SIOCRMNAT _IOW(r, 61, struct ipnat *) -#define SIOCGNATS _IOWR(r, 62, struct natstat *) -#define SIOCGNATL _IOWR(r, 63, struct natlookup *) +#define SIOCADNAT _IOW(r, 60, struct ipfobj) +#define SIOCRMNAT _IOW(r, 61, struct ipfobj) +#define SIOCGNATS _IOWR(r, 62, struct ipfobj) +#define SIOCGNATL _IOWR(r, 63, struct ipfobj) +#define SIOCPROXY _IOWR(r, 64, struct ap_control) #endif -#undef LARGE_NAT /* define this if you're setting up a system to NAT +#undef LARGE_NAT /* define this if you're setting up a system to NAT * LARGE numbers of networks/hosts - i.e. in the * hundreds or thousands. In such a case, you should * also change the RDR_SIZE and NAT_SIZE below to more * appropriate sizes. The figures below were used for * a setup with 1000-2000 networks to NAT. */ -#ifndef NAT_SIZE -# ifdef LARGE_NAT +#ifndef NAT_SIZE +# ifdef LARGE_NAT # define NAT_SIZE 2047 # else # define NAT_SIZE 127 # endif #endif -#ifndef RDR_SIZE -# ifdef LARGE_NAT +#ifndef RDR_SIZE +# ifdef LARGE_NAT # define RDR_SIZE 2047 # else # define RDR_SIZE 127 # endif #endif -#ifndef HOSTMAP_SIZE -# ifdef LARGE_NAT +#ifndef HOSTMAP_SIZE +# ifdef LARGE_NAT # define HOSTMAP_SIZE 8191 # else # define HOSTMAP_SIZE 2047 # endif #endif #ifndef NAT_TABLE_MAX +/* + * This is newly introduced and for the sake of "least surprise", the numbers + * present aren't what we'd normally use for creating a proper hash table. + */ # ifdef LARGE_NAT # define NAT_TABLE_MAX 180000 # else # define NAT_TABLE_MAX 30000 # endif #endif -#ifndef NAT_TABLE_SZ -# ifdef LARGE_NAT +#ifndef NAT_TABLE_SZ +# ifdef LARGE_NAT # define NAT_TABLE_SZ 16383 # else # define NAT_TABLE_SZ 2047 @@ -75,82 +83,141 @@ #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */ +struct ipstate; struct ap_session; typedef struct nat { - u_long nat_age; - int nat_flags; - u_32_t nat_sumd[2]; - u_32_t nat_ipsumd; - void *nat_data; - struct ap_session *nat_aps; /* proxy session */ - struct frentry *nat_fr; /* filter rule ptr if appropriate */ - struct in_addr nat_inip; - struct in_addr nat_outip; - struct in_addr nat_oip; /* other ip */ - U_QUAD_T nat_pkts; - U_QUAD_T nat_bytes; - u_int nat_drop[2]; - u_short nat_oport; /* other port */ - u_short nat_inport; - u_short nat_outport; - u_short nat_use; - u_char nat_tcpstate[2]; - u_char nat_p; /* protocol for NAT */ - u_32_t nat_mssclamp; /* if != zero clamp MSS to this */ - struct ipnat *nat_ptr; /* pointer back to the rule */ - struct hostmap *nat_hm; + ipfmutex_t nat_lock; struct nat *nat_next; + struct nat **nat_pnext; struct nat *nat_hnext[2]; struct nat **nat_phnext[2]; + struct hostmap *nat_hm; + void *nat_data; struct nat **nat_me; - void *nat_ifp; - int nat_dir; - char nat_ifname[IFNAMSIZ]; -#if SOLARIS || defined(__sgi) - kmutex_t nat_lock; -#endif + struct ipstate *nat_state; + struct ap_session *nat_aps; /* proxy session */ + frentry_t *nat_fr; /* filter rule ptr if appropriate */ + struct ipnat *nat_ptr; /* pointer back to the rule */ + void *nat_ifps[2]; + void *nat_sync; + ipftqent_t nat_tqe; + u_32_t nat_flags; + u_32_t nat_sumd[2]; /* ip checksum delta for data segment*/ + u_32_t nat_ipsumd; /* ip checksum delta for ip header */ + u_32_t nat_mssclamp; /* if != zero clamp MSS to this */ + i6addr_t nat_inip6; + i6addr_t nat_outip6; + i6addr_t nat_oip6; /* other ip */ + U_QUAD_T nat_pkts[2]; + U_QUAD_T nat_bytes[2]; + union { + udpinfo_t nat_unu; + tcpinfo_t nat_unt; + icmpinfo_t nat_uni; + greinfo_t nat_ugre; + } nat_un; + u_short nat_oport; /* other port */ + u_short nat_use; + u_char nat_p; /* protocol for NAT */ + int nat_dir; + int nat_ref; /* reference count */ + int nat_hv[2]; + char nat_ifnames[2][LIFNAMSIZ]; + int nat_rev; /* 0 = forward, 1 = reverse */ } nat_t; +#define nat_inip nat_inip6.in4 +#define nat_outip nat_outip6.in4 +#define nat_oip nat_oip6.in4 +#define nat_age nat_tqe.tqe_die +#define nat_inport nat_un.nat_unt.ts_sport +#define nat_outport nat_un.nat_unt.ts_dport +#define nat_type nat_un.nat_uni.ici_type +#define nat_seq nat_un.nat_uni.ici_seq +#define nat_id nat_un.nat_uni.ici_id +#define nat_tcpstate nat_tqe.tqe_state + +/* + * Values for nat_dir + */ +#define NAT_INBOUND 0 +#define NAT_OUTBOUND 1 + +/* + * Definitions for nat_flags + */ +#define NAT_TCP 0x0001 /* IPN_TCP */ +#define NAT_UDP 0x0002 /* IPN_UDP */ +#define NAT_ICMPERR 0x0004 /* IPN_ICMPERR */ +#define NAT_ICMPQUERY 0x0008 /* IPN_ICMPQUERY */ +#define NAT_SEARCH 0x0010 +#define NAT_SLAVE 0x0020 /* Slave connection for a proxy */ +#define NAT_NOTRULEPORT 0x0040 + +#define NAT_TCPUDP (NAT_TCP|NAT_UDP) +#define NAT_TCPUDPICMP (NAT_TCP|NAT_UDP|NAT_ICMPERR) +#define NAT_TCPUDPICMPQ (NAT_TCP|NAT_UDP|NAT_ICMPQUERY) +#define NAT_FROMRULE (NAT_TCP|NAT_UDP) + +/* 0x0100 reserved for FI_W_SPORT */ +/* 0x0200 reserved for FI_W_DPORT */ +/* 0x0400 reserved for FI_W_SADDR */ +/* 0x0800 reserved for FI_W_DADDR */ +/* 0x1000 reserved for FI_W_NEWFR */ +/* 0x2000 reserved for SI_CLONE */ +/* 0x4000 reserved for SI_CLONED */ +/* 0x8000 reserved for SI_IGNOREPKT */ + +#define NAT_DEBUG 0x800000 + typedef struct ipnat { - struct ipnat *in_next; - struct ipnat *in_rnext; - struct ipnat **in_prnext; - struct ipnat *in_mnext; - struct ipnat **in_pmnext; - void *in_ifp; - void *in_apr; - u_long in_space; - u_int in_use; - u_int in_hits; - struct in_addr in_nextip; - u_short in_pnext; - u_short in_ippip; /* IP #'s per IP# */ - u_32_t in_flags; /* From here to in_dport must be reflected */ - u_32_t in_mssclamp; /* if != zero clamp MSS to this */ - u_short in_spare; - u_short in_ppip; /* ports per IP */ - u_short in_port[2]; /* correctly in IPN_CMPSIZ */ - struct in_addr in_in[2]; - struct in_addr in_out[2]; - struct in_addr in_src[2]; - struct frtuc in_tuc; - u_int in_age[2]; /* Aging for NAT entries. Not for TCP */ - int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */ - char in_ifname[IFNAMSIZ]; - char in_plabel[APR_LABELLEN]; /* proxy label */ - char in_p; /* protocol */ + struct ipnat *in_next; /* NAT rule list next */ + struct ipnat *in_rnext; /* rdr rule hash next */ + struct ipnat **in_prnext; /* prior rdr next ptr */ + struct ipnat *in_mnext; /* map rule hash next */ + struct ipnat **in_pmnext; /* prior map next ptr */ + struct ipftq *in_tqehead[2]; + void *in_ifps[2]; + void *in_apr; + char *in_comment; + i6addr_t in_next6; + u_long in_space; + u_long in_hits; + u_int in_use; + u_int in_hv; + int in_flineno; /* conf. file line number */ + u_short in_pnext; + u_char in_v; + u_char in_xxx; + /* From here to the end is covered by IPN_CMPSIZ */ + u_32_t in_flags; + u_32_t in_mssclamp; /* if != 0 clamp MSS to this */ + u_int in_age[2]; + int in_redir; /* see below for values */ + int in_p; /* protocol. */ + i6addr_t in_in[2]; + i6addr_t in_out[2]; + i6addr_t in_src[2]; + frtuc_t in_tuc; + u_short in_port[2]; + u_short in_ppip; /* ports per IP. */ + u_short in_ippip; /* IP #'s per IP# */ + char in_ifnames[2][LIFNAMSIZ]; + char in_plabel[APR_LABELLEN]; /* proxy label. */ + ipftag_t in_tag; } ipnat_t; #define in_pmin in_port[0] /* Also holds static redir port */ #define in_pmax in_port[1] -#define in_nip in_nextip.s_addr -#define in_inip in_in[0].s_addr -#define in_inmsk in_in[1].s_addr -#define in_outip in_out[0].s_addr -#define in_outmsk in_out[1].s_addr -#define in_srcip in_src[0].s_addr -#define in_srcmsk in_src[1].s_addr +#define in_nextip in_next6.in4 +#define in_nip in_next6.in4.s_addr +#define in_inip in_in[0].in4.s_addr +#define in_inmsk in_in[1].in4.s_addr +#define in_outip in_out[0].in4.s_addr +#define in_outmsk in_out[1].in4.s_addr +#define in_srcip in_src[0].in4.s_addr +#define in_srcmsk in_src[1].in4.s_addr #define in_scmp in_tuc.ftu_scmp #define in_dcmp in_tuc.ftu_dcmp #define in_stop in_tuc.ftu_stop @@ -158,18 +225,44 @@ typedef struct ipnat { #define in_sport in_tuc.ftu_sport #define in_dport in_tuc.ftu_dport -#define NAT_OUTBOUND 0 -#define NAT_INBOUND 1 +/* + * Bit definitions for in_flags + */ +#define IPN_ANY 0x00000 +#define IPN_TCP 0x00001 +#define IPN_UDP 0x00002 +#define IPN_TCPUDP (IPN_TCP|IPN_UDP) +#define IPN_ICMPERR 0x00004 +#define IPN_TCPUDPICMP (IPN_TCP|IPN_UDP|IPN_ICMPERR) +#define IPN_ICMPQUERY 0x00008 +#define IPN_TCPUDPICMPQ (IPN_TCP|IPN_UDP|IPN_ICMPQUERY) +#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR) +#define IPN_AUTOPORTMAP 0x00010 +#define IPN_IPRANGE 0x00020 +#define IPN_FILTER 0x00040 +#define IPN_SPLIT 0x00080 +#define IPN_ROUNDR 0x00100 +#define IPN_NOTSRC 0x04000 +#define IPN_NOTDST 0x08000 +#define IPN_DYNSRCIP 0x10000 /* dynamic src IP# */ +#define IPN_DYNDSTIP 0x20000 /* dynamic dst IP# */ +#define IPN_DELETE 0x40000 +#define IPN_STICKY 0x80000 +#define IPN_FRAG 0x100000 +#define IPN_FIXEDDPORT 0x200000 +#define IPN_FINDFORWARD 0x400000 +#define IPN_IN 0x800000 +#define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\ + IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|\ + IPN_FRAG|IPN_STICKY|IPN_FIXEDDPORT|IPN_ICMPQUERY) +/* + * Values for in_redir + */ #define NAT_MAP 0x01 #define NAT_REDIRECT 0x02 #define NAT_BIMAP (NAT_MAP|NAT_REDIRECT) #define NAT_MAPBLK 0x04 -/* 0x100 reserved for FI_W_SPORT */ -/* 0x200 reserved for FI_W_DPORT */ -/* 0x400 reserved for FI_W_SADDR */ -/* 0x800 reserved for FI_W_DADDR */ -/* 0x1000 reserved for FI_W_NEWFR */ #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */ #define USABLE_PORTS (65536 - MAPBLK_MINPORT) @@ -204,16 +297,59 @@ typedef struct natget { } natget_t; +typedef struct nattrpnt { + struct in_addr tr_dstip; /* real destination IP# */ + struct in_addr tr_srcip; /* real source IP# */ + struct in_addr tr_locip; /* local source IP# */ + u_int tr_flags; + int tr_expire; + u_short tr_dstport; /* real destination port# */ + u_short tr_srcport; /* real source port# */ + u_short tr_locport; /* local source port# */ + struct nattrpnt *tr_hnext; + struct nattrpnt **tr_phnext; + struct nattrpnt *tr_next; + struct nattrpnt **tr_pnext; /* previous next */ +} nattrpnt_t; + +#define TN_CMPSIZ offsetof(nattrpnt_t, tr_hnext) + + +/* + * This structure gets used to help NAT sessions keep the same NAT rule (and + * thus translation for IP address) when: + * (a) round-robin redirects are in use + * (b) different IP add + */ typedef struct hostmap { struct hostmap *hm_next; struct hostmap **hm_pnext; struct ipnat *hm_ipnat; - struct in_addr hm_realip; + struct in_addr hm_srcip; + struct in_addr hm_dstip; struct in_addr hm_mapip; - int hm_ref; + u_32_t hm_port; + int hm_ref; } hostmap_t; +/* + * Structure used to pass information in to nat_newmap and nat_newrdr. + */ +typedef struct natinfo { + ipnat_t *nai_np; + u_32_t nai_sum1; + u_32_t nai_sum2; + u_32_t nai_nflags; + u_32_t nai_flags; + struct in_addr nai_ip; + u_short nai_port; + u_short nai_nport; + u_short nai_sport; + u_short nai_dport; +} natinfo_t; + + typedef struct natstat { u_long ns_mapped[2]; u_long ns_rules; @@ -224,37 +360,23 @@ typedef struct natstat { u_long ns_logfail; u_long ns_memfail; u_long ns_badnat; + u_long ns_addtrpnt; nat_t **ns_table[2]; hostmap_t **ns_maptable; ipnat_t *ns_list; void *ns_apslist; + u_int ns_wilds; u_int ns_nattab_sz; + u_int ns_nattab_max; u_int ns_rultab_sz; u_int ns_rdrtab_sz; + u_int ns_trpntab_sz; u_int ns_hostmap_sz; nat_t *ns_instances; - u_int ns_wilds; + nattrpnt_t *ns_trpntlist; + u_long *ns_bucketlen[2]; } natstat_t; -#define IPN_ANY 0x000 -#define IPN_TCP 0x001 -#define IPN_UDP 0x002 -#define IPN_TCPUDP (IPN_TCP|IPN_UDP) -#define IPN_DELETE 0x004 -#define IPN_ICMPERR 0x008 -#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR) -#define IPN_AUTOPORTMAP 0x010 -#define IPN_IPRANGE 0x020 -#define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\ - IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG) -#define IPN_FILTER 0x040 -#define IPN_SPLIT 0x080 -#define IPN_ROUNDR 0x100 -#define IPN_NOTSRC 0x080000 -#define IPN_NOTDST 0x100000 -#define IPN_FRAG 0x200000 - - typedef struct natlog { struct in_addr nl_origip; struct in_addr nl_outip; @@ -264,8 +386,8 @@ typedef struct natlog { u_short nl_inport; u_short nl_type; int nl_rule; - U_QUAD_T nl_pkts; - U_QUAD_T nl_bytes; + U_QUAD_T nl_pkts[2]; + U_QUAD_T nl_bytes[2]; u_char nl_p; } natlog_t; @@ -274,6 +396,7 @@ typedef struct natlog { #define NL_NEWRDR NAT_REDIRECT #define NL_NEWBIMAP NAT_BIMAP #define NL_NEWBLOCK NAT_MAPBLK +#define NL_CLONE 0xfffd #define NL_FLUSH 0xfffe #define NL_EXPIRE 0xffff @@ -295,46 +418,60 @@ typedef struct natlog { #define NAT_SYSSPACE 0x80000000 #define NAT_LOCKHELD 0x40000000 + extern u_int ipf_nattable_sz; +extern u_int ipf_nattable_max; extern u_int ipf_natrules_sz; extern u_int ipf_rdrrules_sz; +extern u_int ipf_hostmap_sz; +extern u_int fr_nat_maxbucket; +extern u_int fr_nat_maxbucket_reset; extern int fr_nat_lock; -extern void ip_natsync __P((void *)); +extern void fr_natsync __P((void *)); extern u_long fr_defnatage; extern u_long fr_defnaticmpage; +extern u_long fr_defnatipage; + /* nat_table[0] -> hashed list sorted by inside (ip, port) */ + /* nat_table[1] -> hashed list sorted by outside (ip, port) */ extern nat_t **nat_table[2]; extern nat_t *nat_instances; +extern ipnat_t *nat_list; extern ipnat_t **nat_rules; extern ipnat_t **rdr_rules; -extern ipnat_t *nat_list; +extern ipftq_t *nat_utqe; extern natstat_t nat_stats; + #if defined(__OpenBSD__) extern void nat_ifdetach __P((void *)); #endif -#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003) -extern int nat_ioctl __P((caddr_t, u_long, int)); -#else -extern int nat_ioctl __P((caddr_t, int, int)); -#endif -extern int nat_init __P((void)); -extern nat_t *nat_new __P((fr_info_t *, ip_t *, ipnat_t *, nat_t **, - u_int, int)); +extern int fr_nat_ioctl __P((caddr_t, ioctlcmd_t, int)); +extern int fr_natinit __P((void)); +extern nat_t *nat_new __P((fr_info_t *, ipnat_t *, nat_t **, u_int, int)); extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr, - struct in_addr, int)); + struct in_addr)); +extern void fix_datacksum __P((u_short *, u_32_t)); extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr, - struct in_addr, int)); + struct in_addr)); +extern nat_t *nat_tnlookup __P((fr_info_t *, int)); +extern nat_t *nat_maplookup __P((void *, u_int, struct in_addr, + struct in_addr)); extern nat_t *nat_lookupredir __P((natlookup_t *)); -extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int)); -extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int)); -extern int nat_clearlist __P((void)); -extern void nat_insert __P((nat_t *)); - -extern int ip_natout __P((ip_t *, fr_info_t *)); -extern int ip_natin __P((ip_t *, fr_info_t *)); -extern void ip_natunload __P((void)), ip_natexpire __P((void)); +extern nat_t *nat_icmperrorlookup __P((fr_info_t *, int)); +extern nat_t *nat_icmperror __P((fr_info_t *, u_int *, int)); +extern int nat_insert __P((nat_t *, int)); + +extern int fr_checknatout __P((fr_info_t *, u_32_t *)); +extern int fr_natout __P((fr_info_t *, nat_t *, int, u_32_t)); +extern int fr_checknatin __P((fr_info_t *, u_32_t *)); +extern int fr_natin __P((fr_info_t *, nat_t *, int, u_32_t)); +extern void fr_natunload __P((void)); +extern void fr_natexpire __P((void)); extern void nat_log __P((struct nat *, u_int)); extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t)); extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t)); -extern void fix_datacksum __P((u_short *, u_32_t)); +extern void fr_natderef __P((nat_t **)); +extern u_short *nat_proto __P((fr_info_t *, nat_t *, u_int)); +extern void nat_update __P((fr_info_t *, nat_t *, ipnat_t *)); +extern void fr_setnatqueue __P((nat_t *, int)); #endif /* __IP_NAT_H__ */ |
