diff options
Diffstat (limited to 'ip_nat.h')
| -rw-r--r-- | ip_nat.h | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/ip_nat.h b/ip_nat.h new file mode 100644 index 0000000..09cc119 --- /dev/null +++ b/ip_nat.h @@ -0,0 +1,477 @@ +/* $NetBSD$ */ + +/* + * 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 2.90.2.9 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))) +#endif + +#if defined(__STDC__) || defined(__GNUC__) +#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 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 + * 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 +# define NAT_SIZE 2047 +# else +# define NAT_SIZE 127 +# endif +#endif +#ifndef RDR_SIZE +# ifdef LARGE_NAT +# define RDR_SIZE 2047 +# else +# define RDR_SIZE 127 +# endif +#endif +#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 +# define NAT_TABLE_SZ 16383 +# else +# define NAT_TABLE_SZ 2047 +# endif +#endif +#ifndef APR_LABELLEN +#define APR_LABELLEN 16 +#endif +#define NAT_HW_CKSUM 0x80000000 + +#define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */ + +struct ipstate; +struct ap_session; + +typedef struct nat { + 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; + 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; /* 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_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 +#define in_dtop in_tuc.ftu_dtop +#define in_sport in_tuc.ftu_sport +#define in_dport in_tuc.ftu_dport + +/* + * 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 + +#define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */ +#define USABLE_PORTS (65536 - MAPBLK_MINPORT) + +#define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags)) + +typedef struct natlookup { + struct in_addr nl_inip; + struct in_addr nl_outip; + struct in_addr nl_realip; + int nl_flags; + u_short nl_inport; + u_short nl_outport; + u_short nl_realport; +} natlookup_t; + + +typedef struct nat_save { + void *ipn_next; + struct nat ipn_nat; + struct ipnat ipn_ipnat; + struct frentry ipn_fr; + int ipn_dsize; + char ipn_data[4]; +} nat_save_t; + +#define ipn_rule ipn_nat.nat_fr + +typedef struct natget { + void *ng_ptr; + int ng_sz; +} 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_srcip; + struct in_addr hm_dstip; + struct in_addr hm_mapip; + 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; + u_long ns_added; + u_long ns_expire; + u_long ns_inuse; + u_long ns_logged; + 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; + nattrpnt_t *ns_trpntlist; + u_long *ns_bucketlen[2]; +} natstat_t; + +typedef struct natlog { + struct in_addr nl_origip; + struct in_addr nl_outip; + struct in_addr nl_inip; + u_short nl_origport; + u_short nl_outport; + u_short nl_inport; + u_short nl_type; + int nl_rule; + U_QUAD_T nl_pkts[2]; + U_QUAD_T nl_bytes[2]; + u_char nl_p; +} natlog_t; + + +#define NL_NEWMAP NAT_MAP +#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 + +#define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m)) + +#define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16)) + +#define CALC_SUMD(s1, s2, sd) { \ + (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ + (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ + /* Do it twice */ \ + (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ + (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ + /* Because ~1 == -2, We really need ~1 == -1 */ \ + if ((s1) > (s2)) (s2)--; \ + (sd) = (s2) - (s1); \ + (sd) = ((sd) & 0xffff) + ((sd) >> 16); } + +#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 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 ipftq_t *nat_utqe; +extern natstat_t nat_stats; + +#if defined(__OpenBSD__) +extern void nat_ifdetach __P((void *)); +#endif +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)); +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)); +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_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 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__ */ |
