bsd/netinet/ip_proxy.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (C) 1997 by Darren Reed.
  24  *
  25  * Redistribution and use in source and binary forms are permitted
  26  * provided that this notice is preserved and due credit is given
  27  * to the original author and the contributors.
  28  *
  29  */
  30
  31 #ifndef __IP_PROXY_H__
  32 #define __IP_PROXY_H__
  33
  34 #ifndef SOLARIS
  35 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
  36 #endif
  37
  38 #ifndef APR_LABELLEN
  39 #define APR_LABELLEN    16
  40 #endif
  41 #define AP_SESS_SIZE    53
  42
  43 struct  nat;
  44 struct  ipnat;
  45
  46 typedef struct  ap_tcp {
  47         u_short apt_sport;      /* source port */
  48         u_short apt_dport;      /* destination port */
  49         short   apt_sel;        /* seqoff/after set selector */
  50         short   apt_seqoff[2];  /* sequence # difference */
  51         tcp_seq apt_after[2];   /* don't change seq-off until after this */
  52         u_char  apt_state[2];   /* connection state */
  53 } ap_tcp_t;
  54
  55 typedef struct  ap_udp {
  56         u_short apu_sport;      /* source port */
  57         u_short apu_dport;      /* destination port */
  58 } ap_udp_t;
  59
  60 typedef struct ap_session {
  61         struct  aproxy  *aps_apr;
  62         struct  in_addr aps_src;        /* source IP# */
  63         struct  in_addr aps_dst;        /* destination IP# */
  64         u_char  aps_p;          /* protocol */
  65         union {
  66                 struct  ap_tcp  apu_tcp;
  67                 struct  ap_udp  apu_udp;
  68         } aps_un;
  69         u_int   aps_flags;
  70         QUAD_T  aps_bytes;      /* bytes sent */
  71         QUAD_T  aps_pkts;       /* packets sent */
  72         u_long  aps_tout;       /* time left before expiring */
  73         void    *aps_data;      /* private data */
  74         int     aps_psiz;       /* size of private data */
  75         struct  ap_session      *aps_next;
  76 } ap_session_t ;
  77
  78 #define aps_sport       aps_un.apu_tcp.apt_sport
  79 #define aps_dport       aps_un.apu_tcp.apt_dport
  80 #define aps_sel         aps_un.apu_tcp.apt_sel
  81 #define aps_seqoff      aps_un.apu_tcp.apt_seqoff
  82 #define aps_after       aps_un.apu_tcp.apt_after
  83 #define aps_state       aps_un.apu_tcp.apt_state
  84
  85
  86 typedef struct  aproxy  {
  87         char    apr_label[APR_LABELLEN];        /* Proxy label # */
  88         u_char  apr_p;          /* protocol */
  89         int     apr_ref;        /* +1 per rule referencing it */
  90         int     apr_flags;
  91         int     (* apr_init) __P((fr_info_t *, ip_t *, tcphdr_t *,
  92                                    ap_session_t *, struct nat *));
  93         int     (* apr_inpkt) __P((fr_info_t *, ip_t *, tcphdr_t *,
  94                                    ap_session_t *, struct nat *));
  95         int     (* apr_outpkt) __P((fr_info_t *, ip_t *, tcphdr_t *,
  96                                     ap_session_t *, struct nat *));
  97 } aproxy_t;
  98
  99 #define APR_DELETE      1
 100
 101
 102 extern  ap_session_t    *ap_sess_tab[AP_SESS_SIZE];
 103 extern  aproxy_t        ap_proxies[];
 104
 105 extern  int     ap_ok __P((ip_t *, tcphdr_t *, struct ipnat *));
 106 extern  void    ap_unload __P((void));
 107 extern  void    ap_free __P((aproxy_t *));
 108 extern  void    aps_free __P((ap_session_t *));
 109 extern  int     ap_check __P((ip_t *, tcphdr_t *, fr_info_t *, struct nat *));
 110 extern  aproxy_t        *ap_match __P((u_char, char *));
 111 extern  void    ap_expire __P((void));
 112
 113 #endif /* __IP_PROXY_H__ */