diff options
Diffstat (limited to 'bpf_lexer.l')
| -rw-r--r-- | bpf_lexer.l | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/bpf_lexer.l b/bpf_lexer.l new file mode 100644 index 0000000..d4b6947 --- /dev/null +++ b/bpf_lexer.l @@ -0,0 +1,126 @@ +/* + * netsniff-ng - the packet sniffing beast + * By Daniel Borkmann <daniel@netsniff-ng.org> + * Copyright 2012 Daniel Borkmann <dborkma@tik.ee.ethz.ch>, + * Swiss federal institute of technology (ETH Zurich) + * Subject to the GPL, version 2. + */ + +/* lex-func-prefix: yy */ + +%{ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <ctype.h> + +#include "bpf_parser.tab.h" +#include "xmalloc.h" + +extern void yyerror(const char *); + +%} + +%option align +%option nounput +%option noyywrap +%option noreject +%option 8bit +%option caseless +%option noinput +%option nodefault + +number_oct ([0][0-9]+) +number_hex ([0][x][a-fA-F0-9]+) +number_bin ([0][b][0-1]+) +number_dec (([0])|([-+]?[1-9][0-9]*)) + +label [a-zA-Z_][a-zA-Z0-9_]+ + +%% + +"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"|"ja" { return OP_JMP; } +"jeq" { return OP_JEQ; } +"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"|"pktlen") { return K_PKT_LEN; } +"#"?("pto"|"proto") { return K_PROTO; } +"#"?("type") { return K_TYPE; } +"#"?("ifx"|"ifidx") { return K_IFIDX; } +"#"?("nla") { return K_NLATTR; } +"#"?("nlan") { return K_NLATTR_NEST; } +"#"?("mark") { return K_MARK; } +"#"?("que"|"queue"|"Q") { return K_QUEUE; } +"#"?("hat"|"hatype") { return K_HATYPE; } +"#"?("rxh"|"rxhash") { return K_RXHASH; } +"#"?("cpu") { return K_CPU; } +"#"?("vlant"|"vlan_tci") { return K_VLANT; } +"#"?("vlana"|"vlan_acc") { return K_VLANP; } +"#"?("vlanp") { return K_VLANP; } + +":" { return ':'; } +"," { return ','; } +"#" { return '#'; } +"[" { return '['; } +"]" { return ']'; } +"(" { return '('; } +")" { return ')'; } +"x" { return 'x'; } +"a" { return 'a'; } +"+" { return '+'; } +"M" { return 'M'; } +"*" { return '*'; } +"&" { return '&'; } + +{number_hex} { yylval.number = strtoul(yytext, NULL, 16); + return number; } + +{number_oct} { yylval.number = strtol(yytext + 1, NULL, 8); + return number; } + +{number_bin} { yylval.number = strtol(yytext + 2, NULL, 2); + return number; } + +{number_dec} { yylval.number = strtol(yytext, NULL, 10); + return number; } + +{label} { yylval.label = xstrdup(yytext); + return label; } + +"/*"([^\*]|\*[^/])*"*/" { /* NOP */ } +";"[^\n]* {/* NOP */} +"\n" { yylineno++; } +[ \t]+ {/* NOP */ } +. { printf("Unknown character '%s'", yytext); + yyerror("lex Unknown character"); } + +%% |