199 lines
4 KiB
Plaintext
199 lines
4 KiB
Plaintext
/*
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* BPF asm code lexer
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*
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* This program is free software; you can distribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License,
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* or (at your option) any later version.
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*
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* Syntax kept close to:
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*
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* Steven McCanne and Van Jacobson. 1993. The BSD packet filter: a new
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* architecture for user-level packet capture. In Proceedings of the
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* USENIX Winter 1993 Conference Proceedings on USENIX Winter 1993
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* Conference Proceedings (USENIX'93). USENIX Association, Berkeley,
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* CA, USA, 2-2.
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*
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* Copyright 2013 Daniel Borkmann <borkmann@redhat.com>
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* Licensed under the GNU General Public License, version 2.0 (GPLv2)
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*/
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%{
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#include <stdio.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/filter.h>
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#include "bpf_exp.yacc.h"
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extern void yyerror(const char *str);
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%}
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%option align
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%option ecs
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%option nounput
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%option noreject
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%option noinput
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%option noyywrap
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%option 8bit
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%option caseless
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%option yylineno
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%%
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"ldb" { return OP_LDB; }
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"ldh" { return OP_LDH; }
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"ld" { return OP_LD; }
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"ldi" { return OP_LDI; }
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"ldx" { return OP_LDX; }
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"ldxi" { return OP_LDXI; }
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"ldxb" { return OP_LDXB; }
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"st" { return OP_ST; }
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"stx" { return OP_STX; }
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"jmp" { return OP_JMP; }
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"ja" { return OP_JMP; }
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"jeq" { return OP_JEQ; }
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"jneq" { return OP_JNEQ; }
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"jne" { return OP_JNEQ; }
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"jlt" { return OP_JLT; }
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"jle" { return OP_JLE; }
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"jgt" { return OP_JGT; }
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"jge" { return OP_JGE; }
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"jset" { return OP_JSET; }
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"add" { return OP_ADD; }
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"sub" { return OP_SUB; }
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"mul" { return OP_MUL; }
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"div" { return OP_DIV; }
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"mod" { return OP_MOD; }
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"neg" { return OP_NEG; }
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"and" { return OP_AND; }
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"xor" { return OP_XOR; }
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"or" { return OP_OR; }
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"lsh" { return OP_LSH; }
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"rsh" { return OP_RSH; }
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"ret" { return OP_RET; }
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"tax" { return OP_TAX; }
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"txa" { return OP_TXA; }
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"#"?("len") { return K_PKT_LEN; }
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"#"?("proto") {
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yylval.number = SKF_AD_PROTOCOL;
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return extension;
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}
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"#"?("type") {
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yylval.number = SKF_AD_PKTTYPE;
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return extension;
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}
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"#"?("poff") {
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yylval.number = SKF_AD_PAY_OFFSET;
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return extension;
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}
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"#"?("ifidx") {
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yylval.number = SKF_AD_IFINDEX;
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return extension;
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}
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"#"?("nla") {
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yylval.number = SKF_AD_NLATTR;
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return extension;
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}
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"#"?("nlan") {
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yylval.number = SKF_AD_NLATTR_NEST;
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return extension;
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}
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"#"?("mark") {
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yylval.number = SKF_AD_MARK;
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return extension;
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}
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"#"?("queue") {
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yylval.number = SKF_AD_QUEUE;
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return extension;
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}
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"#"?("hatype") {
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yylval.number = SKF_AD_HATYPE;
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return extension;
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}
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"#"?("rxhash") {
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yylval.number = SKF_AD_RXHASH;
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return extension;
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}
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"#"?("cpu") {
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yylval.number = SKF_AD_CPU;
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return extension;
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}
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"#"?("vlan_tci") {
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yylval.number = SKF_AD_VLAN_TAG;
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return extension;
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}
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"#"?("vlan_pr") {
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yylval.number = SKF_AD_VLAN_TAG_PRESENT;
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return extension;
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}
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"#"?("vlan_avail") {
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yylval.number = SKF_AD_VLAN_TAG_PRESENT;
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return extension;
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}
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"#"?("vlan_tpid") {
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yylval.number = SKF_AD_VLAN_TPID;
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return extension;
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}
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"#"?("rand") {
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yylval.number = SKF_AD_RANDOM;
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return extension;
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}
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":" { return ':'; }
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"," { return ','; }
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"#" { return '#'; }
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"%" { return '%'; }
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"[" { return '['; }
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"]" { return ']'; }
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"(" { return '('; }
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")" { return ')'; }
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"x" { return 'x'; }
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"a" { return 'a'; }
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"+" { return '+'; }
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"M" { return 'M'; }
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"*" { return '*'; }
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"&" { return '&'; }
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([0][x][a-fA-F0-9]+) {
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yylval.number = strtoul(yytext, NULL, 16);
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return number;
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}
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([0][b][0-1]+) {
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yylval.number = strtol(yytext + 2, NULL, 2);
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return number;
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}
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(([0])|([-+]?[1-9][0-9]*)) {
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yylval.number = strtol(yytext, NULL, 10);
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return number;
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}
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([0][0-7]+) {
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yylval.number = strtol(yytext + 1, NULL, 8);
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return number;
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}
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[a-zA-Z_][a-zA-Z0-9_]+ {
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yylval.label = strdup(yytext);
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return label;
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}
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"/*"([^\*]|\*[^/])*"*/" { /* NOP */ }
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";"[^\n]* { /* NOP */ }
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^#.* { /* NOP */ }
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[ \t]+ { /* NOP */ }
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[ \n]+ { /* NOP */ }
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. {
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printf("unknown character \'%s\'", yytext);
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yyerror("lex unknown character");
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}
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%%
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