The Tcpdump Group git mirrors - libpcap/blob - grammar.y

   1 %{
   2 /*
   3  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that: (1) source code distributions
   8  * retain the above copyright notice and this paragraph in its entirety, (2)
   9  * distributions including binary code include the above copyright notice and
  10  * this paragraph in its entirety in the documentation or other materials
  11  * provided with the distribution, and (3) all advertising materials mentioning
  12  * features or use of this software display the following acknowledgement:
  13  * ``This product includes software developed by the University of California,
  14  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  15  * the University nor the names of its contributors may be used to endorse
  16  * or promote products derived from this software without specific prior
  17  * written permission.
  18  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  19  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  21  *
  22  */
  23 #ifndef lint
  24 static const char rcsid[] _U_ =
  25     "@(#) $Header: /tcpdump/master/libpcap/grammar.y,v 1.85 2004-10-07 16:54:54 guy Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #ifdef WIN32
  33 #include <pcap-stdinc.h>
  34 #else /* WIN32 */
  35 #include <sys/types.h>
  36 #include <sys/time.h>
  37 #include <sys/socket.h>
  38 #endif /* WIN32 */
  39
  40 #include <stdlib.h>
  41
  42 #ifndef WIN32
  43 #if __STDC__
  44 struct mbuf;
  45 struct rtentry;
  46 #endif
  47
  48 #include <netinet/in.h>
  49 #endif /* WIN32 */
  50
  51 #include <stdio.h>
  52
  53 #include "pcap-int.h"
  54
  55 #include "gencode.h"
  56 #include "pf.h"
  57 #include <pcap-namedb.h>
  58
  59 #ifdef HAVE_OS_PROTO_H
  60 #include "os-proto.h"
  61 #endif
  62
  63 #define QSET(q, p, d, a) (q).proto = (p),\
  64                          (q).dir = (d),\
  65                          (q).addr = (a)
  66
  67 int n_errors = 0;
  68
  69 static struct qual qerr = { Q_UNDEF, Q_UNDEF, Q_UNDEF, Q_UNDEF };
  70
  71 static void
  72 yyerror(char *msg)
  73 {
  74         ++n_errors;
  75         bpf_error("%s", msg);
  76         /* NOTREACHED */
  77 }
  78
  79 #ifndef YYBISON
  80 int yyparse(void);
  81
  82 int
  83 pcap_parse()
  84 {
  85         return (yyparse());
  86 }
  87 #endif
  88
  89 %}
  90
  91 %union {
  92         int i;
  93         bpf_u_int32 h;
  94         u_char *e;
  95         char *s;
  96         struct stmt *stmt;
  97         struct arth *a;
  98         struct {
  99                 struct qual q;
 100                 int atmfieldtype;
 101                 struct block *b;
 102         } blk;
 103         struct block *rblk;
 104 }
 105
 106 %type   <blk>   expr id nid pid term rterm qid
 107 %type   <blk>   head
 108 %type   <i>     pqual dqual aqual ndaqual
 109 %type   <a>     arth narth
 110 %type   <i>     byteop pname pnum relop irelop
 111 %type   <blk>   and or paren not null prog
 112 %type   <rblk>  other pfvar
 113 %type   <i>     atmtype atmmultitype
 114 %type   <blk>   atmfield
 115 %type   <blk>   atmfieldvalue atmvalue atmlistvalue
 116
 117 %token  DST SRC HOST GATEWAY
 118 %token  NET NETMASK PORT LESS GREATER PROTO PROTOCHAIN CBYTE
 119 %token  ARP RARP IP SCTP TCP UDP ICMP IGMP IGRP PIM VRRP
 120 %token  ATALK AARP DECNET LAT SCA MOPRC MOPDL
 121 %token  TK_BROADCAST TK_MULTICAST
 122 %token  NUM INBOUND OUTBOUND
 123 %token  PF_IFNAME PF_RSET PF_RNR PF_SRNR PF_REASON PF_ACTION
 124 %token  LINK
 125 %token  GEQ LEQ NEQ
 126 %token  ID EID HID HID6 AID
 127 %token  LSH RSH
 128 %token  LEN
 129 %token  IPV6 ICMPV6 AH ESP
 130 %token  VLAN MPLS
 131 %token  ISO ESIS CLNP ISIS L1 L2 IIH LSP SNP CSNP PSNP
 132 %token  STP
 133 %token  IPX
 134 %token  NETBEUI
 135 %token  LANE LLC METAC BCC SC ILMIC OAMF4EC OAMF4SC
 136 %token  OAM OAMF4 CONNECTMSG METACONNECT
 137 %token  VPI VCI
 138
 139 %type   <s> ID
 140 %type   <e> EID
 141 %type   <e> AID
 142 %type   <s> HID HID6
 143 %type   <i> NUM action reason
 144
 145 %left OR AND
 146 %nonassoc  '!'
 147 %left '|'
 148 %left '&'
 149 %left LSH RSH
 150 %left '+' '-'
 151 %left '*' '/'
 152 %nonassoc UMINUS
 153 %%
 154 prog:     null expr
 155 {
 156         finish_parse($2.b);
 157 }
 158         | null
 159         ;
 160 null:     /* null */            { $$.q = qerr; }
 161         ;
 162 expr:     term
 163         | expr and term         { gen_and($1.b, $3.b); $$ = $3; }
 164         | expr and id           { gen_and($1.b, $3.b); $$ = $3; }
 165         | expr or term          { gen_or($1.b, $3.b); $$ = $3; }
 166         | expr or id            { gen_or($1.b, $3.b); $$ = $3; }
 167         ;
 168 and:      AND                   { $$ = $<blk>0; }
 169         ;
 170 or:       OR                    { $$ = $<blk>0; }
 171         ;
 172 id:       nid
 173         | pnum                  { $$.b = gen_ncode(NULL, (bpf_u_int32)$1,
 174                                                    $$.q = $<blk>0.q); }
 175         | paren pid ')'         { $$ = $2; }
 176         ;
 177 nid:      ID                    { $$.b = gen_scode($1, $$.q = $<blk>0.q); }
 178         | HID '/' NUM           { $$.b = gen_mcode($1, NULL, $3,
 179                                     $$.q = $<blk>0.q); }
 180         | HID NETMASK HID       { $$.b = gen_mcode($1, $3, 0,
 181                                     $$.q = $<blk>0.q); }
 182         | HID                   {
 183                                   /* Decide how to parse HID based on proto */
 184                                   $$.q = $<blk>0.q;
 185                                   $$.b = gen_ncode($1, 0, $$.q);
 186                                 }
 187         | HID6 '/' NUM          {
 188 #ifdef INET6
 189                                   $$.b = gen_mcode6($1, NULL, $3,
 190                                     $$.q = $<blk>0.q);
 191 #else
 192                                   bpf_error("'ip6addr/prefixlen' not supported "
 193                                         "in this configuration");
 194 #endif /*INET6*/
 195                                 }
 196         | HID6                  {
 197 #ifdef INET6
 198                                   $$.b = gen_mcode6($1, 0, 128,
 199                                     $$.q = $<blk>0.q);
 200 #else
 201                                   bpf_error("'ip6addr' not supported "
 202                                         "in this configuration");
 203 #endif /*INET6*/
 204                                 }
 205         | EID                   {
 206                                   $$.b = gen_ecode($1, $$.q = $<blk>0.q);
 207                                   /*
 208                                    * $1 was allocated by "pcap_ether_aton()",
 209                                    * so we must free it now that we're done
 210                                    * with it.
 211                                    */
 212                                   free($1);
 213                                 }
 214         | AID                   {
 215                                   $$.b = gen_acode($1, $$.q = $<blk>0.q);
 216                                   /*
 217                                    * $1 was allocated by "pcap_ether_aton()",
 218                                    * so we must free it now that we're done
 219                                    * with it.
 220                                    */
 221                                   free($1);
 222                                 }
 223         | not id                { gen_not($2.b); $$ = $2; }
 224         ;
 225 not:      '!'                   { $$ = $<blk>0; }
 226         ;
 227 paren:    '('                   { $$ = $<blk>0; }
 228         ;
 229 pid:      nid
 230         | qid and id            { gen_and($1.b, $3.b); $$ = $3; }
 231         | qid or id             { gen_or($1.b, $3.b); $$ = $3; }
 232         ;
 233 qid:      pnum                  { $$.b = gen_ncode(NULL, (bpf_u_int32)$1,
 234                                                    $$.q = $<blk>0.q); }
 235         | pid
 236         ;
 237 term:     rterm
 238         | not term              { gen_not($2.b); $$ = $2; }
 239         ;
 240 head:     pqual dqual aqual     { QSET($$.q, $1, $2, $3); }
 241         | pqual dqual           { QSET($$.q, $1, $2, Q_DEFAULT); }
 242         | pqual aqual           { QSET($$.q, $1, Q_DEFAULT, $2); }
 243         | pqual PROTO           { QSET($$.q, $1, Q_DEFAULT, Q_PROTO); }
 244         | pqual PROTOCHAIN      { QSET($$.q, $1, Q_DEFAULT, Q_PROTOCHAIN); }
 245         | pqual ndaqual         { QSET($$.q, $1, Q_DEFAULT, $2); }
 246         ;
 247 rterm:    head id               { $$ = $2; }
 248         | paren expr ')'        { $$.b = $2.b; $$.q = $1.q; }
 249         | pname                 { $$.b = gen_proto_abbrev($1); $$.q = qerr; }
 250         | arth relop arth       { $$.b = gen_relation($2, $1, $3, 0);
 251                                   $$.q = qerr; }
 252         | arth irelop arth      { $$.b = gen_relation($2, $1, $3, 1);
 253                                   $$.q = qerr; }
 254         | other                 { $$.b = $1; $$.q = qerr; }
 255         | atmtype               { $$.b = gen_atmtype_abbrev($1); $$.q = qerr; }
 256         | atmmultitype          { $$.b = gen_atmmulti_abbrev($1); $$.q = qerr; }
 257         | atmfield atmvalue     { $$.b = $2.b; $$.q = qerr; }
 258         ;
 259 /* protocol level qualifiers */
 260 pqual:    pname
 261         |                       { $$ = Q_DEFAULT; }
 262         ;
 263 /* 'direction' qualifiers */
 264 dqual:    SRC                   { $$ = Q_SRC; }
 265         | DST                   { $$ = Q_DST; }
 266         | SRC OR DST            { $$ = Q_OR; }
 267         | DST OR SRC            { $$ = Q_OR; }
 268         | SRC AND DST           { $$ = Q_AND; }
 269         | DST AND SRC           { $$ = Q_AND; }
 270         ;
 271 /* address type qualifiers */
 272 aqual:    HOST                  { $$ = Q_HOST; }
 273         | NET                   { $$ = Q_NET; }
 274         | PORT                  { $$ = Q_PORT; }
 275         ;
 276 /* non-directional address type qualifiers */
 277 ndaqual:  GATEWAY               { $$ = Q_GATEWAY; }
 278         ;
 279 pname:    LINK                  { $$ = Q_LINK; }
 280         | IP                    { $$ = Q_IP; }
 281         | ARP                   { $$ = Q_ARP; }
 282         | RARP                  { $$ = Q_RARP; }
 283         | SCTP                  { $$ = Q_SCTP; }
 284         | TCP                   { $$ = Q_TCP; }
 285         | UDP                   { $$ = Q_UDP; }
 286         | ICMP                  { $$ = Q_ICMP; }
 287         | IGMP                  { $$ = Q_IGMP; }
 288         | IGRP                  { $$ = Q_IGRP; }
 289         | PIM                   { $$ = Q_PIM; }
 290         | VRRP                  { $$ = Q_VRRP; }
 291         | ATALK                 { $$ = Q_ATALK; }
 292         | AARP                  { $$ = Q_AARP; }
 293         | DECNET                { $$ = Q_DECNET; }
 294         | LAT                   { $$ = Q_LAT; }
 295         | SCA                   { $$ = Q_SCA; }
 296         | MOPDL                 { $$ = Q_MOPDL; }
 297         | MOPRC                 { $$ = Q_MOPRC; }
 298         | IPV6                  { $$ = Q_IPV6; }
 299         | ICMPV6                { $$ = Q_ICMPV6; }
 300         | AH                    { $$ = Q_AH; }
 301         | ESP                   { $$ = Q_ESP; }
 302         | ISO                   { $$ = Q_ISO; }
 303         | ESIS                  { $$ = Q_ESIS; }
 304         | ISIS                  { $$ = Q_ISIS; }
 305         | L1                    { $$ = Q_ISIS_L1; }
 306         | L2                    { $$ = Q_ISIS_L2; }
 307         | IIH                   { $$ = Q_ISIS_IIH; }
 308         | LSP                   { $$ = Q_ISIS_LSP; }
 309         | SNP                   { $$ = Q_ISIS_SNP; }
 310         | PSNP                  { $$ = Q_ISIS_PSNP; }
 311         | CSNP                  { $$ = Q_ISIS_CSNP; }
 312         | CLNP                  { $$ = Q_CLNP; }
 313         | STP                   { $$ = Q_STP; }
 314         | IPX                   { $$ = Q_IPX; }
 315         | NETBEUI               { $$ = Q_NETBEUI; }
 316         ;
 317 other:    pqual TK_BROADCAST    { $$ = gen_broadcast($1); }
 318         | pqual TK_MULTICAST    { $$ = gen_multicast($1); }
 319         | LESS NUM              { $$ = gen_less($2); }
 320         | GREATER NUM           { $$ = gen_greater($2); }
 321         | CBYTE NUM byteop NUM  { $$ = gen_byteop($3, $2, $4); }
 322         | INBOUND               { $$ = gen_inbound(0); }
 323         | OUTBOUND              { $$ = gen_inbound(1); }
 324         | VLAN pnum             { $$ = gen_vlan($2); }
 325         | VLAN                  { $$ = gen_vlan(-1); }
 326         | MPLS pnum             { $$ = gen_mpls($2); }
 327         | MPLS                  { $$ = gen_mpls(-1); }
 328         | pfvar                 { $$ = $1; }
 329         ;
 330
 331 pfvar:    PF_IFNAME ID          { $$ = gen_pf_ifname($2); }
 332         | PF_RSET ID            { $$ = gen_pf_ruleset($2); }
 333         | PF_RNR NUM            { $$ = gen_pf_rnr($2); }
 334         | PF_SRNR NUM           { $$ = gen_pf_srnr($2); }
 335         | PF_REASON reason      { $$ = gen_pf_reason($2); }
 336         | PF_ACTION action      { $$ = gen_pf_action($2); }
 337         ;
 338
 339 reason:   NUM                   { $$ = $1; }
 340         | ID                    { const char *reasons[] = PFRES_NAMES;
 341                                   int i;
 342                                   for (i = 0; reasons[i]; i++) {
 343                                           if (pcap_strcasecmp($1, reasons[i]) == 0) {
 344                                                   $$ = i;
 345                                                   break;
 346                                           }
 347                                   }
 348                                   if (reasons[i] == NULL)
 349                                           bpf_error("unknown PF reason");
 350                                 }
 351         ;
 352
 353 action:   ID                    { if (pcap_strcasecmp($1, "pass") == 0 ||
 354                                       pcap_strcasecmp($1, "accept") == 0)
 355                                         $$ = PF_PASS;
 356                                   else if (pcap_strcasecmp($1, "drop") == 0 ||
 357                                       pcap_strcasecmp($1, "block") == 0)
 358                                         $$ = PF_DROP;
 359                                   else
 360                                           bpf_error("unknown PF action");
 361                                 }
 362         ;
 363
 364 relop:    '>'                   { $$ = BPF_JGT; }
 365         | GEQ                   { $$ = BPF_JGE; }
 366         | '='                   { $$ = BPF_JEQ; }
 367         ;
 368 irelop:   LEQ                   { $$ = BPF_JGT; }
 369         | '<'                   { $$ = BPF_JGE; }
 370         | NEQ                   { $$ = BPF_JEQ; }
 371         ;
 372 arth:     pnum                  { $$ = gen_loadi($1); }
 373         | narth
 374         ;
 375 narth:    pname '[' arth ']'            { $$ = gen_load($1, $3, 1); }
 376         | pname '[' arth ':' NUM ']'    { $$ = gen_load($1, $3, $5); }
 377         | arth '+' arth                 { $$ = gen_arth(BPF_ADD, $1, $3); }
 378         | arth '-' arth                 { $$ = gen_arth(BPF_SUB, $1, $3); }
 379         | arth '*' arth                 { $$ = gen_arth(BPF_MUL, $1, $3); }
 380         | arth '/' arth                 { $$ = gen_arth(BPF_DIV, $1, $3); }
 381         | arth '&' arth                 { $$ = gen_arth(BPF_AND, $1, $3); }
 382         | arth '|' arth                 { $$ = gen_arth(BPF_OR, $1, $3); }
 383         | arth LSH arth                 { $$ = gen_arth(BPF_LSH, $1, $3); }
 384         | arth RSH arth                 { $$ = gen_arth(BPF_RSH, $1, $3); }
 385         | '-' arth %prec UMINUS         { $$ = gen_neg($2); }
 386         | paren narth ')'               { $$ = $2; }
 387         | LEN                           { $$ = gen_loadlen(); }
 388         ;
 389 byteop:   '&'                   { $$ = '&'; }
 390         | '|'                   { $$ = '|'; }
 391         | '<'                   { $$ = '<'; }
 392         | '>'                   { $$ = '>'; }
 393         | '='                   { $$ = '='; }
 394         ;
 395 pnum:     NUM
 396         | paren pnum ')'        { $$ = $2; }
 397         ;
 398 atmtype: LANE                   { $$ = A_LANE; }
 399         | LLC                   { $$ = A_LLC; }
 400         | METAC                 { $$ = A_METAC; }
 401         | BCC                   { $$ = A_BCC; }
 402         | OAMF4EC               { $$ = A_OAMF4EC; }
 403         | OAMF4SC               { $$ = A_OAMF4SC; }
 404         | SC                    { $$ = A_SC; }
 405         | ILMIC                 { $$ = A_ILMIC; }
 406         ;
 407 atmmultitype: OAM               { $$ = A_OAM; }
 408         | OAMF4                 { $$ = A_OAMF4; }
 409         | CONNECTMSG            { $$ = A_CONNECTMSG; }
 410         | METACONNECT           { $$ = A_METACONNECT; }
 411         ;
 412         /* ATM field types quantifier */
 413 atmfield: VPI                   { $$.atmfieldtype = A_VPI; }
 414         | VCI                   { $$.atmfieldtype = A_VCI; }
 415         ;
 416 atmvalue: atmfieldvalue
 417         | relop NUM             { $$.b = gen_atmfield_code($<blk>0.atmfieldtype, (u_int)$2, (u_int)$1, 0); }
 418         | irelop NUM            { $$.b = gen_atmfield_code($<blk>0.atmfieldtype, (u_int)$2, (u_int)$1, 1); }
 419         | paren atmlistvalue ')' { $$.b = $2.b; $$.q = qerr; }
 420         ;
 421 atmfieldvalue: NUM {
 422         $$.atmfieldtype = $<blk>0.atmfieldtype;
 423         if ($$.atmfieldtype == A_VPI ||
 424             $$.atmfieldtype == A_VCI)
 425                 $$.b = gen_atmfield_code($$.atmfieldtype, (u_int) $1, BPF_JEQ, 0);
 426         }
 427         ;
 428 atmlistvalue: atmfieldvalue
 429         | atmlistvalue or atmfieldvalue { gen_or($1.b, $3.b); $$ = $3; }
 430         ;
 431 %%