sys/contrib/ipfilter/netinet/ip_proxy.h

   1 /*
   2  * Copyright (C) 1997-2001 by Darren Reed.
   3  *
   4  * See the IPFILTER.LICENCE file for details on licencing.
   5  *
   6  * $Id: ip_proxy.h,v 2.8.2.13 2002/07/04 11:07:37 darrenr Exp $
   7  * $FreeBSD: src/sys/contrib/ipfilter/netinet/ip_proxy.h,v 1.9.2.5 2003/03/01 03:55:54 darrenr Exp $
   8  * $DragonFly: src/sys/contrib/ipfilter/netinet/ip_proxy.h,v 1.3 2003/08/27 11:02:14 rob Exp $
   9  */
  10
  11 #ifndef __IP_PROXY_H__
  12 #define __IP_PROXY_H__
  13
  14 #ifndef SOLARIS
  15 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
  16 #endif
  17
  18 #ifndef APR_LABELLEN
  19 #define APR_LABELLEN    16
  20 #endif
  21 #define AP_SESS_SIZE    53
  22
  23 struct  nat;
  24 struct  ipnat;
  25
  26 typedef struct  ap_tcp {
  27         u_short apt_sport;      /* source port */
  28         u_short apt_dport;      /* destination port */
  29         short   apt_sel[2];     /* {seq,ack}{off,min} set selector */
  30         short   apt_seqoff[2];  /* sequence # difference */
  31         tcp_seq apt_seqmin[2];  /* don't change seq-off until after this */
  32         short   apt_ackoff[2];  /* sequence # difference */
  33         tcp_seq apt_ackmin[2];  /* don't change seq-off until after this */
  34         u_char  apt_state[2];   /* connection state */
  35 } ap_tcp_t;
  36
  37 typedef struct  ap_udp {
  38         u_short apu_sport;      /* source port */
  39         u_short apu_dport;      /* destination port */
  40 } ap_udp_t;
  41
  42 typedef struct ap_session {
  43         struct  aproxy  *aps_apr;
  44         union {
  45                 struct  ap_tcp  apu_tcp;
  46                 struct  ap_udp  apu_udp;
  47         } aps_un;
  48         u_int   aps_flags;
  49         U_QUAD_T aps_bytes;     /* bytes sent */
  50         U_QUAD_T aps_pkts;      /* packets sent */
  51         void    *aps_nat;       /* pointer back to nat struct */
  52         void    *aps_data;      /* private data */
  53         int     aps_p;          /* protocol */
  54         int     aps_psiz;       /* size of private data */
  55         struct  ap_session      *aps_hnext;
  56         struct  ap_session      *aps_next;
  57 } ap_session_t;
  58
  59 #define aps_sport       aps_un.apu_tcp.apt_sport
  60 #define aps_dport       aps_un.apu_tcp.apt_dport
  61 #define aps_sel         aps_un.apu_tcp.apt_sel
  62 #define aps_seqoff      aps_un.apu_tcp.apt_seqoff
  63 #define aps_seqmin      aps_un.apu_tcp.apt_seqmin
  64 #define aps_state       aps_un.apu_tcp.apt_state
  65 #define aps_ackoff      aps_un.apu_tcp.apt_ackoff
  66 #define aps_ackmin      aps_un.apu_tcp.apt_ackmin
  67
  68
  69 typedef struct  aproxy  {
  70         struct  aproxy  *apr_next;
  71         char    apr_label[APR_LABELLEN];        /* Proxy label # */
  72         u_char  apr_p;          /* protocol */
  73         int     apr_ref;        /* +1 per rule referencing it */
  74         int     apr_flags;
  75         int     (* apr_init) (void);
  76         void    (* apr_fini) (void);
  77         int     (* apr_new) (fr_info_t *, ip_t *,
  78                                  ap_session_t *, struct nat *);
  79         void    (* apr_del) (ap_session_t *);
  80         int     (* apr_inpkt) (fr_info_t *, ip_t *,
  81                                    ap_session_t *, struct nat *);
  82         int     (* apr_outpkt) (fr_info_t *, ip_t *,
  83                                     ap_session_t *, struct nat *);
  84         int     (* apr_match) (fr_info_t *, ap_session_t *, struct nat *);
  85 } aproxy_t;
  86
  87 #define APR_DELETE      1
  88
  89 #define APR_ERR(x)      (((x) & 0xffff) << 16)
  90 #define APR_EXIT(x)     (((x) >> 16) & 0xffff)
  91 #define APR_INC(x)      ((x) & 0xffff)
  92
  93 #define FTP_BUFSZ       160
  94 /*
  95  * For the ftp proxy.
  96  */
  97 typedef struct  ftpside {
  98         char    *ftps_rptr;
  99         char    *ftps_wptr;
 100         u_32_t  ftps_seq[2];
 101         u_32_t  ftps_len;
 102         int     ftps_junk;
 103         int     ftps_cmds;
 104         int     ftps_cmd;
 105         char    ftps_buf[FTP_BUFSZ];
 106 } ftpside_t;
 107
 108 typedef struct  ftpinfo {
 109         int             ftp_passok;
 110         int             ftp_incok;
 111         ftpside_t       ftp_side[2];
 112 } ftpinfo_t;
 113
 114 /*
 115  * Real audio proxy structure and #defines
 116  */
 117 typedef struct  raudio_s {
 118         int     rap_seenpna;
 119         int     rap_seenver;
 120         int     rap_version;
 121         int     rap_eos;        /* End Of Startup */
 122         int     rap_gotid;
 123         int     rap_gotlen;
 124         int     rap_mode;
 125         int     rap_sdone;
 126         u_short rap_plport;
 127         u_short rap_prport;
 128         u_short rap_srport;
 129         char    rap_svr[19];
 130         u_32_t  rap_sbf;        /* flag to indicate which of the 19 bytes have
 131                                  * been filled
 132                                  */
 133         tcp_seq rap_sseq;
 134 } raudio_t;
 135
 136 #define RA_ID_END       0
 137 #define RA_ID_UDP       1
 138 #define RA_ID_ROBUST    7
 139
 140 #define RAP_M_UDP       1
 141 #define RAP_M_ROBUST    2
 142 #define RAP_M_TCP       4
 143 #define RAP_M_UDP_ROBUST        (RAP_M_UDP|RAP_M_ROBUST)
 144
 145 /*
 146  * IPSec proxy
 147  */
 148 typedef u_32_t  ipsec_cookie_t[2];
 149
 150 typedef struct ipsec_pxy {
 151         ipsec_cookie_t  ipsc_icookie;
 152         ipsec_cookie_t  ipsc_rcookie;
 153         int             ipsc_rckset;
 154         ipnat_t         ipsc_rule;
 155         nat_t           *ipsc_nat;
 156         ipstate_t       *ipsc_state;
 157 } ipsec_pxy_t;
 158
 159 extern  ap_session_t    *ap_sess_tab[AP_SESS_SIZE];
 160 extern  ap_session_t    *ap_sess_list;
 161 extern  aproxy_t        ap_proxies[];
 162 extern  int             ippr_ftp_pasvonly;
 163
 164 extern  int     appr_add (aproxy_t *);
 165 extern  int     appr_del (aproxy_t *);
 166 extern  int     appr_init (void);
 167 extern  void    appr_unload (void);
 168 extern  int     appr_ok (ip_t *, tcphdr_t *, struct ipnat *);
 169 extern  int     appr_match (fr_info_t *, struct nat *);
 170 extern  void    appr_free (aproxy_t *);
 171 extern  void    aps_free (ap_session_t *);
 172 extern  int     appr_check (ip_t *, fr_info_t *, struct nat *);
 173 extern  aproxy_t        *appr_lookup (u_int, char *);
 174 extern  int     appr_new (fr_info_t *, ip_t *, struct nat *);
 175
 176 #endif /* __IP_PROXY_H__ */