478 lines
13 KiB
C
478 lines
13 KiB
C
/* $NetBSD$ */
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/*
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* Copyright (C) 1995-2001, 2003 by Darren Reed.
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*
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* See the IPFILTER.LICENCE file for details on licencing.
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*
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* @(#)ip_nat.h 1.5 2/4/96
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* Id: ip_nat.h,v 2.90.2.9 2005/03/28 11:09:55 darrenr Exp
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*/
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#ifndef __IP_NAT_H__
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#define __IP_NAT_H__
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#ifndef SOLARIS
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#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
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#endif
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#if defined(__STDC__) || defined(__GNUC__)
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#define SIOCADNAT _IOW('r', 60, struct ipfobj)
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#define SIOCRMNAT _IOW('r', 61, struct ipfobj)
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#define SIOCGNATS _IOWR('r', 62, struct ipfobj)
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#define SIOCGNATL _IOWR('r', 63, struct ipfobj)
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#define SIOCPROXY _IOWR('r', 64, struct ap_control)
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#else
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#define SIOCADNAT _IOW(r, 60, struct ipfobj)
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#define SIOCRMNAT _IOW(r, 61, struct ipfobj)
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#define SIOCGNATS _IOWR(r, 62, struct ipfobj)
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#define SIOCGNATL _IOWR(r, 63, struct ipfobj)
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#define SIOCPROXY _IOWR(r, 64, struct ap_control)
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#endif
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#undef LARGE_NAT /* define this if you're setting up a system to NAT
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* LARGE numbers of networks/hosts - i.e. in the
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* hundreds or thousands. In such a case, you should
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* also change the RDR_SIZE and NAT_SIZE below to more
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* appropriate sizes. The figures below were used for
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* a setup with 1000-2000 networks to NAT.
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*/
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#ifndef NAT_SIZE
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# ifdef LARGE_NAT
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# define NAT_SIZE 2047
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# else
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# define NAT_SIZE 127
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# endif
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#endif
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#ifndef RDR_SIZE
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# ifdef LARGE_NAT
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# define RDR_SIZE 2047
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# else
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# define RDR_SIZE 127
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# endif
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#endif
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#ifndef HOSTMAP_SIZE
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# ifdef LARGE_NAT
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# define HOSTMAP_SIZE 8191
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# else
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# define HOSTMAP_SIZE 2047
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# endif
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#endif
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#ifndef NAT_TABLE_MAX
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/*
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* This is newly introduced and for the sake of "least surprise", the numbers
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* present aren't what we'd normally use for creating a proper hash table.
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*/
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# ifdef LARGE_NAT
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# define NAT_TABLE_MAX 180000
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# else
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# define NAT_TABLE_MAX 30000
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# endif
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#endif
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#ifndef NAT_TABLE_SZ
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# ifdef LARGE_NAT
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# define NAT_TABLE_SZ 16383
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# else
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# define NAT_TABLE_SZ 2047
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# endif
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#endif
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#ifndef APR_LABELLEN
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#define APR_LABELLEN 16
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#endif
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#define NAT_HW_CKSUM 0x80000000
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#define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */
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struct ipstate;
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struct ap_session;
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typedef struct nat {
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ipfmutex_t nat_lock;
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struct nat *nat_next;
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struct nat **nat_pnext;
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struct nat *nat_hnext[2];
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struct nat **nat_phnext[2];
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struct hostmap *nat_hm;
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void *nat_data;
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struct nat **nat_me;
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struct ipstate *nat_state;
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struct ap_session *nat_aps; /* proxy session */
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frentry_t *nat_fr; /* filter rule ptr if appropriate */
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struct ipnat *nat_ptr; /* pointer back to the rule */
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void *nat_ifps[2];
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void *nat_sync;
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ipftqent_t nat_tqe;
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u_32_t nat_flags;
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u_32_t nat_sumd[2]; /* ip checksum delta for data segment*/
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u_32_t nat_ipsumd; /* ip checksum delta for ip header */
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u_32_t nat_mssclamp; /* if != zero clamp MSS to this */
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i6addr_t nat_inip6;
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i6addr_t nat_outip6;
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i6addr_t nat_oip6; /* other ip */
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U_QUAD_T nat_pkts[2];
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U_QUAD_T nat_bytes[2];
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union {
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udpinfo_t nat_unu;
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tcpinfo_t nat_unt;
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icmpinfo_t nat_uni;
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greinfo_t nat_ugre;
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} nat_un;
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u_short nat_oport; /* other port */
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u_short nat_use;
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u_char nat_p; /* protocol for NAT */
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int nat_dir;
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int nat_ref; /* reference count */
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int nat_hv[2];
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char nat_ifnames[2][LIFNAMSIZ];
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int nat_rev; /* 0 = forward, 1 = reverse */
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} nat_t;
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#define nat_inip nat_inip6.in4
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#define nat_outip nat_outip6.in4
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#define nat_oip nat_oip6.in4
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#define nat_age nat_tqe.tqe_die
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#define nat_inport nat_un.nat_unt.ts_sport
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#define nat_outport nat_un.nat_unt.ts_dport
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#define nat_type nat_un.nat_uni.ici_type
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#define nat_seq nat_un.nat_uni.ici_seq
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#define nat_id nat_un.nat_uni.ici_id
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#define nat_tcpstate nat_tqe.tqe_state
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/*
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* Values for nat_dir
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*/
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#define NAT_INBOUND 0
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#define NAT_OUTBOUND 1
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/*
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* Definitions for nat_flags
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*/
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#define NAT_TCP 0x0001 /* IPN_TCP */
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#define NAT_UDP 0x0002 /* IPN_UDP */
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#define NAT_ICMPERR 0x0004 /* IPN_ICMPERR */
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#define NAT_ICMPQUERY 0x0008 /* IPN_ICMPQUERY */
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#define NAT_SEARCH 0x0010
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#define NAT_SLAVE 0x0020 /* Slave connection for a proxy */
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#define NAT_NOTRULEPORT 0x0040
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#define NAT_TCPUDP (NAT_TCP|NAT_UDP)
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#define NAT_TCPUDPICMP (NAT_TCP|NAT_UDP|NAT_ICMPERR)
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#define NAT_TCPUDPICMPQ (NAT_TCP|NAT_UDP|NAT_ICMPQUERY)
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#define NAT_FROMRULE (NAT_TCP|NAT_UDP)
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/* 0x0100 reserved for FI_W_SPORT */
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/* 0x0200 reserved for FI_W_DPORT */
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/* 0x0400 reserved for FI_W_SADDR */
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/* 0x0800 reserved for FI_W_DADDR */
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/* 0x1000 reserved for FI_W_NEWFR */
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/* 0x2000 reserved for SI_CLONE */
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/* 0x4000 reserved for SI_CLONED */
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/* 0x8000 reserved for SI_IGNOREPKT */
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#define NAT_DEBUG 0x800000
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typedef struct ipnat {
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struct ipnat *in_next; /* NAT rule list next */
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struct ipnat *in_rnext; /* rdr rule hash next */
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struct ipnat **in_prnext; /* prior rdr next ptr */
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struct ipnat *in_mnext; /* map rule hash next */
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struct ipnat **in_pmnext; /* prior map next ptr */
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struct ipftq *in_tqehead[2];
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void *in_ifps[2];
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void *in_apr;
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char *in_comment;
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i6addr_t in_next6;
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u_long in_space;
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u_long in_hits;
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u_int in_use;
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u_int in_hv;
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int in_flineno; /* conf. file line number */
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u_short in_pnext;
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u_char in_v;
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u_char in_xxx;
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/* From here to the end is covered by IPN_CMPSIZ */
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u_32_t in_flags;
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u_32_t in_mssclamp; /* if != 0 clamp MSS to this */
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u_int in_age[2];
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int in_redir; /* see below for values */
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int in_p; /* protocol. */
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i6addr_t in_in[2];
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i6addr_t in_out[2];
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i6addr_t in_src[2];
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frtuc_t in_tuc;
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u_short in_port[2];
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u_short in_ppip; /* ports per IP. */
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u_short in_ippip; /* IP #'s per IP# */
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char in_ifnames[2][LIFNAMSIZ];
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char in_plabel[APR_LABELLEN]; /* proxy label. */
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ipftag_t in_tag;
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} ipnat_t;
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#define in_pmin in_port[0] /* Also holds static redir port */
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#define in_pmax in_port[1]
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#define in_nextip in_next6.in4
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#define in_nip in_next6.in4.s_addr
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#define in_inip in_in[0].in4.s_addr
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#define in_inmsk in_in[1].in4.s_addr
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#define in_outip in_out[0].in4.s_addr
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#define in_outmsk in_out[1].in4.s_addr
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#define in_srcip in_src[0].in4.s_addr
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#define in_srcmsk in_src[1].in4.s_addr
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#define in_scmp in_tuc.ftu_scmp
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#define in_dcmp in_tuc.ftu_dcmp
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#define in_stop in_tuc.ftu_stop
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#define in_dtop in_tuc.ftu_dtop
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#define in_sport in_tuc.ftu_sport
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#define in_dport in_tuc.ftu_dport
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/*
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* Bit definitions for in_flags
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*/
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#define IPN_ANY 0x00000
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#define IPN_TCP 0x00001
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#define IPN_UDP 0x00002
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#define IPN_TCPUDP (IPN_TCP|IPN_UDP)
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#define IPN_ICMPERR 0x00004
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#define IPN_TCPUDPICMP (IPN_TCP|IPN_UDP|IPN_ICMPERR)
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#define IPN_ICMPQUERY 0x00008
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#define IPN_TCPUDPICMPQ (IPN_TCP|IPN_UDP|IPN_ICMPQUERY)
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#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
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#define IPN_AUTOPORTMAP 0x00010
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#define IPN_IPRANGE 0x00020
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#define IPN_FILTER 0x00040
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#define IPN_SPLIT 0x00080
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#define IPN_ROUNDR 0x00100
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#define IPN_NOTSRC 0x04000
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#define IPN_NOTDST 0x08000
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#define IPN_DYNSRCIP 0x10000 /* dynamic src IP# */
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#define IPN_DYNDSTIP 0x20000 /* dynamic dst IP# */
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#define IPN_DELETE 0x40000
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#define IPN_STICKY 0x80000
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#define IPN_FRAG 0x100000
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#define IPN_FIXEDDPORT 0x200000
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#define IPN_FINDFORWARD 0x400000
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#define IPN_IN 0x800000
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#define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\
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IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|\
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IPN_FRAG|IPN_STICKY|IPN_FIXEDDPORT|IPN_ICMPQUERY)
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/*
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* Values for in_redir
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*/
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#define NAT_MAP 0x01
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#define NAT_REDIRECT 0x02
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#define NAT_BIMAP (NAT_MAP|NAT_REDIRECT)
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#define NAT_MAPBLK 0x04
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#define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */
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#define USABLE_PORTS (65536 - MAPBLK_MINPORT)
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#define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
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typedef struct natlookup {
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struct in_addr nl_inip;
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struct in_addr nl_outip;
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struct in_addr nl_realip;
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int nl_flags;
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u_short nl_inport;
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u_short nl_outport;
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u_short nl_realport;
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} natlookup_t;
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typedef struct nat_save {
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void *ipn_next;
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struct nat ipn_nat;
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struct ipnat ipn_ipnat;
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struct frentry ipn_fr;
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int ipn_dsize;
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char ipn_data[4];
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} nat_save_t;
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#define ipn_rule ipn_nat.nat_fr
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typedef struct natget {
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void *ng_ptr;
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int ng_sz;
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} natget_t;
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typedef struct nattrpnt {
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struct in_addr tr_dstip; /* real destination IP# */
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struct in_addr tr_srcip; /* real source IP# */
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struct in_addr tr_locip; /* local source IP# */
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u_int tr_flags;
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int tr_expire;
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u_short tr_dstport; /* real destination port# */
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u_short tr_srcport; /* real source port# */
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u_short tr_locport; /* local source port# */
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struct nattrpnt *tr_hnext;
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struct nattrpnt **tr_phnext;
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struct nattrpnt *tr_next;
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struct nattrpnt **tr_pnext; /* previous next */
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} nattrpnt_t;
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#define TN_CMPSIZ offsetof(nattrpnt_t, tr_hnext)
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/*
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* This structure gets used to help NAT sessions keep the same NAT rule (and
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* thus translation for IP address) when:
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* (a) round-robin redirects are in use
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* (b) different IP add
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*/
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typedef struct hostmap {
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struct hostmap *hm_next;
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struct hostmap **hm_pnext;
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struct ipnat *hm_ipnat;
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struct in_addr hm_srcip;
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struct in_addr hm_dstip;
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struct in_addr hm_mapip;
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u_32_t hm_port;
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int hm_ref;
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} hostmap_t;
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/*
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* Structure used to pass information in to nat_newmap and nat_newrdr.
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*/
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typedef struct natinfo {
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ipnat_t *nai_np;
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u_32_t nai_sum1;
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u_32_t nai_sum2;
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u_32_t nai_nflags;
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u_32_t nai_flags;
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struct in_addr nai_ip;
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u_short nai_port;
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u_short nai_nport;
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u_short nai_sport;
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u_short nai_dport;
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} natinfo_t;
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typedef struct natstat {
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u_long ns_mapped[2];
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u_long ns_rules;
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u_long ns_added;
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u_long ns_expire;
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u_long ns_inuse;
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u_long ns_logged;
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u_long ns_logfail;
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u_long ns_memfail;
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u_long ns_badnat;
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u_long ns_addtrpnt;
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nat_t **ns_table[2];
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hostmap_t **ns_maptable;
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ipnat_t *ns_list;
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void *ns_apslist;
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u_int ns_wilds;
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u_int ns_nattab_sz;
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u_int ns_nattab_max;
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u_int ns_rultab_sz;
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u_int ns_rdrtab_sz;
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u_int ns_trpntab_sz;
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u_int ns_hostmap_sz;
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nat_t *ns_instances;
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nattrpnt_t *ns_trpntlist;
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u_long *ns_bucketlen[2];
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} natstat_t;
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typedef struct natlog {
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struct in_addr nl_origip;
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struct in_addr nl_outip;
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struct in_addr nl_inip;
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u_short nl_origport;
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u_short nl_outport;
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u_short nl_inport;
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u_short nl_type;
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int nl_rule;
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U_QUAD_T nl_pkts[2];
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U_QUAD_T nl_bytes[2];
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u_char nl_p;
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} natlog_t;
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#define NL_NEWMAP NAT_MAP
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#define NL_NEWRDR NAT_REDIRECT
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#define NL_NEWBIMAP NAT_BIMAP
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#define NL_NEWBLOCK NAT_MAPBLK
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#define NL_CLONE 0xfffd
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#define NL_FLUSH 0xfffe
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#define NL_EXPIRE 0xffff
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#define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m))
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#define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16))
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#define CALC_SUMD(s1, s2, sd) { \
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(s1) = ((s1) & 0xffff) + ((s1) >> 16); \
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(s2) = ((s2) & 0xffff) + ((s2) >> 16); \
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/* Do it twice */ \
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(s1) = ((s1) & 0xffff) + ((s1) >> 16); \
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(s2) = ((s2) & 0xffff) + ((s2) >> 16); \
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/* Because ~1 == -2, We really need ~1 == -1 */ \
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if ((s1) > (s2)) (s2)--; \
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(sd) = (s2) - (s1); \
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(sd) = ((sd) & 0xffff) + ((sd) >> 16); }
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#define NAT_SYSSPACE 0x80000000
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#define NAT_LOCKHELD 0x40000000
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extern u_int ipf_nattable_sz;
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extern u_int ipf_nattable_max;
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extern u_int ipf_natrules_sz;
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extern u_int ipf_rdrrules_sz;
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extern u_int ipf_hostmap_sz;
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extern u_int fr_nat_maxbucket;
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extern u_int fr_nat_maxbucket_reset;
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extern int fr_nat_lock;
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extern void fr_natsync __P((void *));
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extern u_long fr_defnatage;
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extern u_long fr_defnaticmpage;
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extern u_long fr_defnatipage;
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/* nat_table[0] -> hashed list sorted by inside (ip, port) */
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/* nat_table[1] -> hashed list sorted by outside (ip, port) */
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extern nat_t **nat_table[2];
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extern nat_t *nat_instances;
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extern ipnat_t *nat_list;
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extern ipnat_t **nat_rules;
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extern ipnat_t **rdr_rules;
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extern ipftq_t *nat_utqe;
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extern natstat_t nat_stats;
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#if defined(__OpenBSD__)
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extern void nat_ifdetach __P((void *));
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#endif
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extern int fr_nat_ioctl __P((caddr_t, ioctlcmd_t, int));
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extern int fr_natinit __P((void));
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extern nat_t *nat_new __P((fr_info_t *, ipnat_t *, nat_t **, u_int, int));
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extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
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struct in_addr));
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extern void fix_datacksum __P((u_short *, u_32_t));
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extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
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struct in_addr));
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extern nat_t *nat_tnlookup __P((fr_info_t *, int));
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extern nat_t *nat_maplookup __P((void *, u_int, struct in_addr,
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struct in_addr));
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extern nat_t *nat_lookupredir __P((natlookup_t *));
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extern nat_t *nat_icmperrorlookup __P((fr_info_t *, int));
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extern nat_t *nat_icmperror __P((fr_info_t *, u_int *, int));
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extern int nat_insert __P((nat_t *, int));
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extern int fr_checknatout __P((fr_info_t *, u_32_t *));
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extern int fr_natout __P((fr_info_t *, nat_t *, int, u_32_t));
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extern int fr_checknatin __P((fr_info_t *, u_32_t *));
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extern int fr_natin __P((fr_info_t *, nat_t *, int, u_32_t));
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extern void fr_natunload __P((void));
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extern void fr_natexpire __P((void));
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extern void nat_log __P((struct nat *, u_int));
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extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t));
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extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t));
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extern void fr_natderef __P((nat_t **));
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extern u_short *nat_proto __P((fr_info_t *, nat_t *, u_int));
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extern void nat_update __P((fr_info_t *, nat_t *, ipnat_t *));
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extern void fr_setnatqueue __P((nat_t *, int));
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#endif /* __IP_NAT_H__ */
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