sys/dist/ipf/netinet/ip_proxy.h

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 1997-2001 by Darren Reed.
   5  *
   6  * See the IPFILTER.LICENCE file for details on licencing.
   7  *
   8  * Id: ip_proxy.h,v 2.31.2.6 2007/10/26 12:15:13 darrenr Exp
   9  */
  10
  11 #ifndef _NETINET_IP_PROXY_H_
  12 #define _NETINET_IP_PROXY_H_
  13
  14 #ifndef SOLARIS
  15 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
  16 #endif
  17
  18 #if defined(__STDC__) || defined(__GNUC__) || defined(_AIX51)
  19 #define SIOCPROXY       _IOWR('r', 64, struct ap_control)
  20 #else
  21 #define SIOCPROXY       _IOWR(r, 64, struct ap_control)
  22 #endif
  23
  24 #ifndef APR_LABELLEN
  25 #define APR_LABELLEN    16
  26 #endif
  27 #define AP_SESS_SIZE    53
  28
  29 struct  nat;
  30 struct  ipnat;
  31 struct  ipstate;
  32
  33 typedef struct  ap_tcp {
  34         u_short apt_sport;      /* source port */
  35         u_short apt_dport;      /* destination port */
  36         short   apt_sel[2];     /* {seq,ack}{off,min} set selector */
  37         short   apt_seqoff[2];  /* sequence # difference */
  38         u_32_t  apt_seqmin[2];  /* don't change seq-off until after this */
  39         short   apt_ackoff[2];  /* sequence # difference */
  40         u_32_t  apt_ackmin[2];  /* don't change seq-off until after this */
  41         u_char  apt_state[2];   /* connection state */
  42 } ap_tcp_t;
  43
  44 typedef struct  ap_udp {
  45         u_short apu_sport;      /* source port */
  46         u_short apu_dport;      /* destination port */
  47 } ap_udp_t;
  48
  49 typedef struct ap_session {
  50         struct  aproxy  *aps_apr;
  51         union {
  52                 struct  ap_tcp  apu_tcp;
  53                 struct  ap_udp  apu_udp;
  54         } aps_un;
  55         u_int   aps_flags;
  56         U_QUAD_T aps_bytes;     /* bytes sent */
  57         U_QUAD_T aps_pkts;      /* packets sent */
  58         void    *aps_nat;       /* pointer back to nat struct */
  59         void    *aps_data;      /* private data */
  60         int     aps_p;          /* protocol */
  61         int     aps_psiz;       /* size of private data */
  62         struct  ap_session      *aps_hnext;
  63         struct  ap_session      *aps_next;
  64 } ap_session_t;
  65
  66 #define aps_sport       aps_un.apu_tcp.apt_sport
  67 #define aps_dport       aps_un.apu_tcp.apt_dport
  68 #define aps_sel         aps_un.apu_tcp.apt_sel
  69 #define aps_seqoff      aps_un.apu_tcp.apt_seqoff
  70 #define aps_seqmin      aps_un.apu_tcp.apt_seqmin
  71 #define aps_state       aps_un.apu_tcp.apt_state
  72 #define aps_ackoff      aps_un.apu_tcp.apt_ackoff
  73 #define aps_ackmin      aps_un.apu_tcp.apt_ackmin
  74
  75
  76 typedef struct  ap_control {
  77         char    apc_label[APR_LABELLEN];
  78         u_char  apc_p;
  79         /*
  80          * The following fields are upto the proxy's apr_ctl routine to deal
  81          * with.  When the proxy gets this in kernel space, apc_data will
  82          * point to a malloc'd region of memory of apc_dsize bytes.  If the
  83          * proxy wants to keep that memory, it must set apc_data to NULL
  84          * before it returns.  It is expected if this happens that it will
  85          * take care to free it in apr_fini or otherwise as appropriate.
  86          * apc_cmd is provided as a standard place to put simple commands,
  87          * with apc_arg being available to put a simple arg.
  88          */
  89         u_long  apc_cmd;
  90         u_long  apc_arg;
  91         void    *apc_data;
  92         size_t  apc_dsize;
  93 } ap_ctl_t;
  94
  95
  96 typedef struct  aproxy  {
  97         struct  aproxy  *apr_next;
  98         char    apr_label[APR_LABELLEN];        /* Proxy label # */
  99         u_char  apr_p;          /* protocol */
 100         int     apr_ref;        /* +1 per rule referencing it */
 101         int     apr_flags;
 102         int     (* apr_init) __P((void));
 103         void    (* apr_fini) __P((void));
 104         int     (* apr_new) __P((fr_info_t *, ap_session_t *, struct nat *));
 105         void    (* apr_del) __P((ap_session_t *));
 106         int     (* apr_inpkt) __P((fr_info_t *, ap_session_t *, struct nat *));
 107         int     (* apr_outpkt) __P((fr_info_t *, ap_session_t *, struct nat *));
 108         int     (* apr_match) __P((fr_info_t *, ap_session_t *, struct nat *));
 109         int     (* apr_ctl) __P((struct aproxy *, struct ap_control *));
 110 } aproxy_t;
 111
 112 #define APR_DELETE      1
 113
 114 #define APR_ERR(x)      ((x) << 16)
 115 #define APR_EXIT(x)     (((x) >> 16) & 0xffff)
 116 #define APR_INC(x)      ((x) & 0xffff)
 117
 118 /*
 119  * Generic #define's to cover missing things in the kernel
 120  */
 121 #ifndef isdigit
 122 #define isdigit(x)      ((x) >= '0' && (x) <= '9')
 123 #endif
 124 #ifndef isupper
 125 #define isupper(x)      (((unsigned)(x) >= 'A') && ((unsigned)(x) <= 'Z'))
 126 #endif
 127 #ifndef islower
 128 #define islower(x)      (((unsigned)(x) >= 'a') && ((unsigned)(x) <= 'z'))
 129 #endif
 130 #ifndef isalpha
 131 #define isalpha(x)      (isupper(x) || islower(x))
 132 #endif
 133 #ifndef toupper
 134 #define toupper(x)      (isupper(x) ? (x) : (x) - 'a' + 'A')
 135 #endif
 136 #ifndef isspace
 137 #define isspace(x)      (((x) == ' ') || ((x) == '\r') || ((x) == '\n') || \
 138                          ((x) == '\t') || ((x) == '\b'))
 139 #endif
 140
 141 /*
 142  * This is the scratch buffer size used to hold strings from the TCP stream
 143  * that we may want to parse.  It's an arbitrary size, really, but it must
 144  * be at least as large as IPF_FTPBUFSZ.
 145  */
 146 #define FTP_BUFSZ       120
 147
 148 /*
 149  * This buffer, however, doesn't need to be nearly so big.  It just needs to
 150  * be able to squeeze in the largest command it needs to rewrite, Which ones
 151  * does it rewrite? EPRT, PORT, 227 replies.
 152  */
 153 #define IPF_FTPBUFSZ    80      /* This *MUST* be >= 53! */
 154
 155 typedef struct  ftpside {
 156         char    *ftps_rptr;
 157         char    *ftps_wptr;
 158         void    *ftps_ifp;
 159         u_32_t  ftps_seq[2];
 160         u_32_t  ftps_len;
 161         int     ftps_junk;      /* 2 = no cr/lf yet, 1 = cannot parse */
 162         int     ftps_cmds;
 163         char    ftps_buf[FTP_BUFSZ];
 164 } ftpside_t;
 165
 166 typedef struct  ftpinfo {
 167         int             ftp_passok;
 168         int             ftp_incok;
 169         ftpside_t       ftp_side[2];
 170 } ftpinfo_t;
 171
 172
 173 /*
 174  * For the irc proxy.
 175  */
 176 typedef struct  ircinfo {
 177         size_t  irc_len;
 178         char    *irc_snick;
 179         char    *irc_dnick;
 180         char    *irc_type;
 181         char    *irc_arg;
 182         char    *irc_addr;
 183         u_32_t  irc_ipnum;
 184         u_short irc_port;
 185 } ircinfo_t;
 186
 187
 188 /*
 189  * Real audio proxy structure and #defines
 190  */
 191 typedef struct  raudio_s {
 192         int     rap_seenpna;
 193         int     rap_seenver;
 194         int     rap_version;
 195         int     rap_eos;        /* End Of Startup */
 196         int     rap_gotid;
 197         int     rap_gotlen;
 198         int     rap_mode;
 199         int     rap_sdone;
 200         u_short rap_plport;
 201         u_short rap_prport;
 202         u_short rap_srport;
 203         char    rap_svr[19];
 204         u_32_t  rap_sbf;        /* flag to indicate which of the 19 bytes have
 205                                  * been filled
 206                                  */
 207         u_32_t  rap_sseq;
 208 } raudio_t;
 209
 210 #define RA_ID_END       0
 211 #define RA_ID_UDP       1
 212 #define RA_ID_ROBUST    7
 213
 214 #define RAP_M_UDP       1
 215 #define RAP_M_ROBUST    2
 216 #define RAP_M_TCP       4
 217 #define RAP_M_UDP_ROBUST        (RAP_M_UDP|RAP_M_ROBUST)
 218
 219
 220 /*
 221  * MSN RPC proxy
 222  */
 223 typedef struct  msnrpcinfo      {
 224         u_int           mri_flags;
 225         int             mri_cmd[2];
 226         u_int           mri_valid;
 227         struct  in_addr mri_raddr;
 228         u_short         mri_rport;
 229 } msnrpcinfo_t;
 230
 231
 232 /*
 233  * IPSec proxy
 234  */
 235 typedef u_32_t  ipsec_cookie_t[2];
 236
 237 typedef struct ipsec_pxy {
 238         ipsec_cookie_t  ipsc_icookie;
 239         ipsec_cookie_t  ipsc_rcookie;
 240         int             ipsc_rckset;
 241         ipnat_t         ipsc_rule;
 242         nat_t           *ipsc_nat;
 243         struct ipstate  *ipsc_state;
 244 } ipsec_pxy_t;
 245
 246 /*
 247  * PPTP proxy
 248  */
 249 typedef struct pptp_side {
 250         u_32_t          pptps_nexthdr;
 251         u_32_t          pptps_next;
 252         int             pptps_state;
 253         int             pptps_gothdr;
 254         int             pptps_len;
 255         int             pptps_bytes;
 256         char            *pptps_wptr;
 257         char            pptps_buffer[512];
 258 } pptp_side_t;
 259
 260 typedef struct pptp_pxy {
 261         ipnat_t         pptp_rule;
 262         nat_t           *pptp_nat;
 263         struct ipstate  *pptp_state;
 264         u_short         pptp_call[2];
 265         pptp_side_t     pptp_side[2];
 266 } pptp_pxy_t;
 267
 268
 269 /*
 270  * Sun RPCBIND proxy
 271  */
 272 #define RPCB_MAXMSG     888
 273 #define RPCB_RES_PMAP   0       /* Response contains a v2 port. */
 274 #define RPCB_RES_STRING 1       /* " " " v3 (GETADDR) string. */
 275 #define RPCB_RES_LIST   2       /* " " " v4 (GETADDRLIST) list. */
 276 #define RPCB_MAXREQS    32      /* Arbitrary limit on tracked transactions */
 277
 278 #define RPCB_REQMIN     40
 279 #define RPCB_REQMAX     888
 280 #define RPCB_REPMIN     20
 281 #define RPCB_REPMAX     604     /* XXX double check this! */
 282
 283 /*
 284  * These macros determine the number of bytes between p and the end of
 285  * r->rs_buf relative to l.
 286  */
 287 #define RPCB_BUF_END(r) (char *)((r)->rm_msgbuf + (r)->rm_buflen)
 288 #define RPCB_BUF_GEQ(r, p, l)   \
 289         ((RPCB_BUF_END((r)) > (char *)(p)) &&           \
 290          ((RPCB_BUF_END((r)) - (char *)(p)) >= (l)))
 291 #define RPCB_BUF_EQ(r, p, l)                            \
 292         (RPCB_BUF_END((r)) == ((char *)(p) + (l)))
 293
 294 /*
 295  * The following correspond to RPC(B) detailed in RFC183[13].
 296  */
 297 #define RPCB_CALL               0
 298 #define RPCB_REPLY              1
 299 #define RPCB_MSG_VERSION        2
 300 #define RPCB_PROG               100000
 301 #define RPCB_GETPORT            3
 302 #define RPCB_GETADDR            3
 303 #define RPCB_GETADDRLIST        11
 304 #define RPCB_MSG_ACCEPTED       0
 305 #define RPCB_MSG_DENIED         1
 306
 307 /* BEGIN (Generic XDR structures) */
 308 typedef struct xdr_string {
 309         u_32_t  *xs_len;
 310         char    *xs_str;
 311 } xdr_string_t;
 312
 313 typedef struct xdr_auth {
 314         /* u_32_t       xa_flavor; */
 315         xdr_string_t    xa_string;
 316 } xdr_auth_t;
 317
 318 typedef struct xdr_uaddr {
 319         u_32_t          xu_ip;
 320         u_short         xu_port;
 321         xdr_string_t    xu_str;
 322 } xdr_uaddr_t;
 323
 324 typedef struct xdr_proto {
 325         u_int           xp_proto;
 326         xdr_string_t    xp_str;
 327 } xdr_proto_t;
 328
 329 #define xu_xslen        xu_str.xs_len
 330 #define xu_xsstr        xu_str.xs_str
 331 #define xp_xslen        xp_str.xs_len
 332 #define xp_xsstr        xp_str.xs_str
 333 /* END (Generic XDR structures) */
 334
 335 /* BEGIN (RPC call structures) */
 336 typedef struct pmap_args {
 337         /* u_32_t       pa_prog; */
 338         /* u_32_t       pa_vers; */
 339         u_32_t          *pa_prot;
 340         /* u_32_t       pa_port; */
 341 } pmap_args_t;
 342
 343 typedef struct rpcb_args {
 344         /* u_32_t       *ra_prog; */
 345         /* u_32_t       *ra_vers; */
 346         xdr_proto_t     ra_netid;
 347         xdr_uaddr_t     ra_maddr;
 348         /* xdr_string_t ra_owner; */
 349 } rpcb_args_t;
 350
 351 typedef struct rpc_call {
 352         /* u_32_t       rc_rpcvers; */
 353         /* u_32_t       rc_prog; */
 354         u_32_t  *rc_vers;
 355         u_32_t  *rc_proc;
 356         xdr_auth_t      rc_authcred;
 357         xdr_auth_t      rc_authverf;
 358         union {
 359                 pmap_args_t     ra_pmapargs;
 360                 rpcb_args_t     ra_rpcbargs;
 361         } rpcb_args;
 362 } rpc_call_t;
 363
 364 #define rc_pmapargs     rpcb_args.ra_pmapargs
 365 #define rc_rpcbargs     rpcb_args.ra_rpcbargs
 366 /* END (RPC call structures) */
 367
 368 /* BEGIN (RPC reply structures) */
 369 typedef struct rpcb_entry {
 370         xdr_uaddr_t     re_maddr;
 371         xdr_proto_t     re_netid;
 372         /* u_32_t       re_semantics; */
 373         xdr_string_t    re_family;
 374         xdr_proto_t     re_proto;
 375         u_32_t          *re_more; /* 1 == another entry follows */
 376 } rpcb_entry_t;
 377
 378 typedef struct rpcb_listp {
 379         u_32_t          *rl_list; /* 1 == list follows */
 380         int             rl_cnt;
 381         rpcb_entry_t    rl_entries[2]; /* TCP / UDP only */
 382 } rpcb_listp_t;
 383
 384 typedef struct rpc_resp {
 385         /* u_32_t       rr_acceptdeny; */
 386         /* Omitted 'message denied' fork; we don't care about rejects. */
 387         xdr_auth_t      rr_authverf;
 388         /* u_32_t               *rr_astat;      */
 389         union {
 390                 u_32_t          *resp_pmap;
 391                 xdr_uaddr_t     resp_getaddr;
 392                 rpcb_listp_t    resp_getaddrlist;
 393         } rpcb_reply;
 394 } rpc_resp_t;
 395
 396 #define rr_v2   rpcb_reply.resp_pmap
 397 #define rr_v3   rpcb_reply.resp_getaddr
 398 #define rr_v4   rpcb_reply.resp_getaddrlist
 399 /* END (RPC reply structures) */
 400
 401 /* BEGIN (RPC message structure & macros) */
 402 typedef struct rpc_msg {
 403         char    rm_msgbuf[RPCB_MAXMSG]; /* RPCB data buffer */
 404         u_int   rm_buflen;
 405         u_32_t  *rm_xid;
 406         /* u_32_t Call vs Reply */
 407         union {
 408                 rpc_call_t      rb_call;
 409                 rpc_resp_t      rb_resp;
 410         } rm_body;
 411 } rpc_msg_t;
 412
 413 #define rm_call         rm_body.rb_call
 414 #define rm_resp         rm_body.rb_resp
 415 /* END (RPC message structure & macros) */
 416
 417 /*
 418  * These code paths aren't hot enough to warrant per transaction
 419  * mutexes.
 420  */
 421 typedef struct rpcb_xact {
 422         struct  rpcb_xact       *rx_next;
 423         struct  rpcb_xact       **rx_pnext;
 424         u_32_t  rx_xid;         /* RPC transmission ID */
 425         u_int   rx_type;        /* RPCB response type */
 426         u_int   rx_ref;         /* reference count */
 427         u_int   rx_proto;       /* transport protocol (v2 only) */
 428 } rpcb_xact_t;
 429
 430 typedef struct rpcb_session {
 431         ipfmutex_t      rs_rxlock;
 432         rpcb_xact_t     *rs_rxlist;
 433 } rpcb_session_t;
 434
 435 /*
 436  * For an explanation, please see the following:
 437  *   RFC1832 - Sections 3.11, 4.4, and 4.5.
 438  */
 439 #define XDRALIGN(x)     ((((x) % 4) != 0) ? ((((x) + 3) / 4) * 4) : (x))
 440
 441 extern  ap_session_t    *ap_sess_tab[AP_SESS_SIZE];
 442 extern  ap_session_t    *ap_sess_list;
 443 extern  aproxy_t        ap_proxies[];
 444 extern  int             ippr_ftp_pasvonly;
 445 extern  int             ipf_proxy_debug;
 446
 447 extern  int     appr_add __P((aproxy_t *));
 448 extern  int     appr_ctl __P((ap_ctl_t *));
 449 extern  int     appr_del __P((aproxy_t *));
 450 extern  int     appr_init __P((void));
 451 extern  void    appr_unload __P((void));
 452 extern  int     appr_ok __P((fr_info_t *, tcphdr_t *, struct ipnat *));
 453 extern  int     appr_match __P((fr_info_t *, struct nat *));
 454 extern  void    appr_free __P((aproxy_t *));
 455 extern  void    aps_free __P((ap_session_t *));
 456 extern  int     appr_check __P((fr_info_t *, struct nat *));
 457 extern  aproxy_t        *appr_lookup __P((u_int, char *));
 458 extern  int     appr_new __P((fr_info_t *, struct nat *));
 459 extern  int     appr_ioctl __P((void *, ioctlcmd_t, int, void *));
 460
 461 #endif /* _NETINET_IP_PROXY_H_ */