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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 | /* * BPF asm code lexer * * This program is free software; you can distribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, * or (at your option) any later version. * * Syntax kept close to: * * Steven McCanne and Van Jacobson. 1993. The BSD packet filter: a new * architecture for user-level packet capture. In Proceedings of the * USENIX Winter 1993 Conference Proceedings on USENIX Winter 1993 * Conference Proceedings (USENIX'93). USENIX Association, Berkeley, * CA, USA, 2-2. * * Copyright 2013 Daniel Borkmann <borkmann@redhat.com> * Licensed under the GNU General Public License, version 2.0 (GPLv2) */ %{ #include <stdio.h> #include <stdint.h> #include <stdlib.h> #include <string.h> #include <linux/filter.h> #include "bpf_exp.yacc.h" extern void yyerror(const char *str); %} %option align %option ecs %option nounput %option noreject %option noinput %option noyywrap %option 8bit %option caseless %option yylineno %% "ldb" { return OP_LDB; } "ldh" { return OP_LDH; } "ld" { return OP_LD; } "ldi" { return OP_LDI; } "ldx" { return OP_LDX; } "ldxi" { return OP_LDXI; } "ldxb" { return OP_LDXB; } "st" { return OP_ST; } "stx" { return OP_STX; } "jmp" { return OP_JMP; } "ja" { return OP_JMP; } "jeq" { return OP_JEQ; } "jneq" { return OP_JNEQ; } "jne" { return OP_JNEQ; } "jlt" { return OP_JLT; } "jle" { return OP_JLE; } "jgt" { return OP_JGT; } "jge" { return OP_JGE; } "jset" { return OP_JSET; } "add" { return OP_ADD; } "sub" { return OP_SUB; } "mul" { return OP_MUL; } "div" { return OP_DIV; } "mod" { return OP_MOD; } "neg" { return OP_NEG; } "and" { return OP_AND; } "xor" { return OP_XOR; } "or" { return OP_OR; } "lsh" { return OP_LSH; } "rsh" { return OP_RSH; } "ret" { return OP_RET; } "tax" { return OP_TAX; } "txa" { return OP_TXA; } "#"?("len") { return K_PKT_LEN; } "#"?("proto") { yylval.number = SKF_AD_PROTOCOL; return extension; } "#"?("type") { yylval.number = SKF_AD_PKTTYPE; return extension; } "#"?("poff") { yylval.number = SKF_AD_PAY_OFFSET; return extension; } "#"?("ifidx") { yylval.number = SKF_AD_IFINDEX; return extension; } "#"?("nla") { yylval.number = SKF_AD_NLATTR; return extension; } "#"?("nlan") { yylval.number = SKF_AD_NLATTR_NEST; return extension; } "#"?("mark") { yylval.number = SKF_AD_MARK; return extension; } "#"?("queue") { yylval.number = SKF_AD_QUEUE; return extension; } "#"?("hatype") { yylval.number = SKF_AD_HATYPE; return extension; } "#"?("rxhash") { yylval.number = SKF_AD_RXHASH; return extension; } "#"?("cpu") { yylval.number = SKF_AD_CPU; return extension; } "#"?("vlan_tci") { yylval.number = SKF_AD_VLAN_TAG; return extension; } "#"?("vlan_pr") { yylval.number = SKF_AD_VLAN_TAG_PRESENT; return extension; } "#"?("vlan_avail") { yylval.number = SKF_AD_VLAN_TAG_PRESENT; return extension; } "#"?("vlan_tpid") { yylval.number = SKF_AD_VLAN_TPID; return extension; } "#"?("rand") { yylval.number = SKF_AD_RANDOM; return extension; } ":" { return ':'; } "," { return ','; } "#" { return '#'; } "%" { return '%'; } "[" { return '['; } "]" { return ']'; } "(" { return '('; } ")" { return ')'; } "x" { return 'x'; } "a" { return 'a'; } "+" { return '+'; } "M" { return 'M'; } "*" { return '*'; } "&" { return '&'; } ([0][x][a-fA-F0-9]+) { yylval.number = strtoul(yytext, NULL, 16); return number; } ([0][b][0-1]+) { yylval.number = strtol(yytext + 2, NULL, 2); return number; } (([0])|([-+]?[1-9][0-9]*)) { yylval.number = strtol(yytext, NULL, 10); return number; } ([0][0-7]+) { yylval.number = strtol(yytext + 1, NULL, 8); return number; } [a-zA-Z_][a-zA-Z0-9_]+ { yylval.label = strdup(yytext); return label; } "/*"([^\*]|\*[^/])*"*/" { /* NOP */ } ";"[^\n]* { /* NOP */ } ^#.* { /* NOP */ } [ \t]+ { /* NOP */ } [ \n]+ { /* NOP */ } . { printf("unknown character \'%s\'", yytext); yyerror("lex unknown character"); } %% |