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/*
* 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][0-9]+) {
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");
}
%%
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