tools/net/bpf_exp.l

   1 /*
   2  * BPF asm code lexer
   3  *
   4  * This program is free software; you can distribute it and/or modify
   5  * it under the terms of the GNU General Public License as published
   6  * by the Free Software Foundation; either version 2 of the License,
   7  * or (at your option) any later version.
   8  *
   9  * Syntax kept close to:
  10  *
  11  * Steven McCanne and Van Jacobson. 1993. The BSD packet filter: a new
  12  * architecture for user-level packet capture. In Proceedings of the
  13  * USENIX Winter 1993 Conference Proceedings on USENIX Winter 1993
  14  * Conference Proceedings (USENIX'93). USENIX Association, Berkeley,
  15  * CA, USA, 2-2.
  16  *
  17  * Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
  18  * Licensed under the GNU General Public License, version 2.0 (GPLv2)
  19  */
  20
  21 %{
  22
  23 #include <stdio.h>
  24 #include <stdint.h>
  25 #include <stdlib.h>
  26
  27 #include "bpf_exp.yacc.h"
  28
  29 extern void yyerror(const char *str);
  30
  31 %}
  32
  33 %option align
  34 %option ecs
  35
  36 %option nounput
  37 %option noreject
  38 %option noinput
  39 %option noyywrap
  40
  41 %option 8bit
  42 %option caseless
  43 %option yylineno
  44
  45 %%
  46
  47 "ldb"           { return OP_LDB; }
  48 "ldh"           { return OP_LDH; }
  49 "ld"            { return OP_LD; }
  50 "ldi"           { return OP_LDI; }
  51 "ldx"           { return OP_LDX; }
  52 "ldxi"          { return OP_LDXI; }
  53 "ldxb"          { return OP_LDXB; }
  54 "st"            { return OP_ST; }
  55 "stx"           { return OP_STX; }
  56 "jmp"           { return OP_JMP; }
  57 "ja"            { return OP_JMP; }
  58 "jeq"           { return OP_JEQ; }
  59 "jneq"          { return OP_JNEQ; }
  60 "jne"           { return OP_JNEQ; }
  61 "jlt"           { return OP_JLT; }
  62 "jle"           { return OP_JLE; }
  63 "jgt"           { return OP_JGT; }
  64 "jge"           { return OP_JGE; }
  65 "jset"          { return OP_JSET; }
  66 "add"           { return OP_ADD; }
  67 "sub"           { return OP_SUB; }
  68 "mul"           { return OP_MUL; }
  69 "div"           { return OP_DIV; }
  70 "mod"           { return OP_MOD; }
  71 "neg"           { return OP_NEG; }
  72 "and"           { return OP_AND; }
  73 "xor"           { return OP_XOR; }
  74 "or"            { return OP_OR; }
  75 "lsh"           { return OP_LSH; }
  76 "rsh"           { return OP_RSH; }
  77 "ret"           { return OP_RET; }
  78 "tax"           { return OP_TAX; }
  79 "txa"           { return OP_TXA; }
  80
  81 "#"?("len")     { return K_PKT_LEN; }
  82 "#"?("proto")   { return K_PROTO; }
  83 "#"?("type")    { return K_TYPE; }
  84 "#"?("poff")    { return K_POFF; }
  85 "#"?("ifidx")   { return K_IFIDX; }
  86 "#"?("nla")     { return K_NLATTR; }
  87 "#"?("nlan")    { return K_NLATTR_NEST; }
  88 "#"?("mark")    { return K_MARK; }
  89 "#"?("queue")   { return K_QUEUE; }
  90 "#"?("hatype")  { return K_HATYPE; }
  91 "#"?("rxhash")  { return K_RXHASH; }
  92 "#"?("cpu")     { return K_CPU; }
  93 "#"?("vlan_tci")        { return K_VLAN_TCI; }
  94 "#"?("vlan_pr")         { return K_VLAN_AVAIL; }
  95 "#"?("vlan_avail")      { return K_VLAN_AVAIL; }
  96 "#"?("vlan_tpid")       { return K_VLAN_TPID; }
  97 "#"?("rand")    { return K_RAND; }
  98
  99 ":"             { return ':'; }
 100 ","             { return ','; }
 101 "#"             { return '#'; }
 102 "%"             { return '%'; }
 103 "["             { return '['; }
 104 "]"             { return ']'; }
 105 "("             { return '('; }
 106 ")"             { return ')'; }
 107 "x"             { return 'x'; }
 108 "a"             { return 'a'; }
 109 "+"             { return '+'; }
 110 "M"             { return 'M'; }
 111 "*"             { return '*'; }
 112 "&"             { return '&'; }
 113
 114 ([0][x][a-fA-F0-9]+) {
 115                         yylval.number = strtoul(yytext, NULL, 16);
 116                         return number;
 117                 }
 118 ([0][b][0-1]+)  {
 119                         yylval.number = strtol(yytext + 2, NULL, 2);
 120                         return number;
 121                 }
 122 (([0])|([-+]?[1-9][0-9]*)) {
 123                         yylval.number = strtol(yytext, NULL, 10);
 124                         return number;
 125                 }
 126 ([0][0-9]+)     {
 127                         yylval.number = strtol(yytext + 1, NULL, 8);
 128                         return number;
 129                 }
 130 [a-zA-Z_][a-zA-Z0-9_]+ {
 131                         yylval.label = strdup(yytext);
 132                         return label;
 133                 }
 134
 135 "/*"([^\*]|\*[^/])*"*/"         { /* NOP */ }
 136 ";"[^\n]*                       { /* NOP */ }
 137 ^#.*                            { /* NOP */ }
 138 [ \t]+                          { /* NOP */ }
 139 [ \n]+                          { /* NOP */ }
 140
 141 .               {
 142                         printf("unknown character \'%s\'", yytext);
 143                         yyerror("lex unknown character");
 144                 }
 145
 146 %%