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 #include <string.h>
27
28 #include <linux/filter.h>
29
30 #include "bpf_exp.yacc.h"
31
32 extern void yyerror(const char *str);
33
34 %}
35
36 %option align
37 %option ecs
38
39 %option nounput
40 %option noreject
41 %option noinput
42 %option noyywrap
43
44 %option 8bit
45 %option caseless
46 %option yylineno
47
48 %%
49
50 "ldb" { return OP_LDB; }
51 "ldh" { return OP_LDH; }
52 "ld" { return OP_LD; }
53 "ldi" { return OP_LDI; }
54 "ldx" { return OP_LDX; }
55 "ldxi" { return OP_LDXI; }
56 "ldxb" { return OP_LDXB; }
57 "st" { return OP_ST; }
58 "stx" { return OP_STX; }
59 "jmp" { return OP_JMP; }
60 "ja" { return OP_JMP; }
61 "jeq" { return OP_JEQ; }
62 "jneq" { return OP_JNEQ; }
63 "jne" { return OP_JNEQ; }
64 "jlt" { return OP_JLT; }
65 "jle" { return OP_JLE; }
66 "jgt" { return OP_JGT; }
67 "jge" { return OP_JGE; }
68 "jset" { return OP_JSET; }
69 "add" { return OP_ADD; }
70 "sub" { return OP_SUB; }
71 "mul" { return OP_MUL; }
72 "div" { return OP_DIV; }
73 "mod" { return OP_MOD; }
74 "neg" { return OP_NEG; }
75 "and" { return OP_AND; }
76 "xor" { return OP_XOR; }
77 "or" { return OP_OR; }
78 "lsh" { return OP_LSH; }
79 "rsh" { return OP_RSH; }
80 "ret" { return OP_RET; }
81 "tax" { return OP_TAX; }
82 "txa" { return OP_TXA; }
83
84 "#"?("len") { return K_PKT_LEN; }
85
86 "#"?("proto") {
87 yylval.number = SKF_AD_PROTOCOL;
88 return extension;
89 }
90 "#"?("type") {
91 yylval.number = SKF_AD_PKTTYPE;
92 return extension;
93 }
94 "#"?("poff") {
95 yylval.number = SKF_AD_PAY_OFFSET;
96 return extension;
97 }
98 "#"?("ifidx") {
99 yylval.number = SKF_AD_IFINDEX;
100 return extension;
101 }
102 "#"?("nla") {
103 yylval.number = SKF_AD_NLATTR;
104 return extension;
105 }
106 "#"?("nlan") {
107 yylval.number = SKF_AD_NLATTR_NEST;
108 return extension;
109 }
110 "#"?("mark") {
111 yylval.number = SKF_AD_MARK;
112 return extension;
113 }
114 "#"?("queue") {
115 yylval.number = SKF_AD_QUEUE;
116 return extension;
117 }
118 "#"?("hatype") {
119 yylval.number = SKF_AD_HATYPE;
120 return extension;
121 }
122 "#"?("rxhash") {
123 yylval.number = SKF_AD_RXHASH;
124 return extension;
125 }
126 "#"?("cpu") {
127 yylval.number = SKF_AD_CPU;
128 return extension;
129 }
130 "#"?("vlan_tci") {
131 yylval.number = SKF_AD_VLAN_TAG;
132 return extension;
133 }
134 "#"?("vlan_pr") {
135 yylval.number = SKF_AD_VLAN_TAG_PRESENT;
136 return extension;
137 }
138 "#"?("vlan_avail") {
139 yylval.number = SKF_AD_VLAN_TAG_PRESENT;
140 return extension;
141 }
142 "#"?("vlan_tpid") {
143 yylval.number = SKF_AD_VLAN_TPID;
144 return extension;
145 }
146 "#"?("rand") {
147 yylval.number = SKF_AD_RANDOM;
148 return extension;
149 }
150
151 ":" { return ':'; }
152 "," { return ','; }
153 "#" { return '#'; }
154 "%" { return '%'; }
155 "[" { return '['; }
156 "]" { return ']'; }
157 "(" { return '('; }
158 ")" { return ')'; }
159 "x" { return 'x'; }
160 "a" { return 'a'; }
161 "+" { return '+'; }
162 "M" { return 'M'; }
163 "*" { return '*'; }
164 "&" { return '&'; }
165
166 ([0][x][a-fA-F0-9]+) {
167 yylval.number = strtoul(yytext, NULL, 16);
168 return number;
169 }
170 ([0][b][0-1]+) {
171 yylval.number = strtol(yytext + 2, NULL, 2);
172 return number;
173 }
174 (([0])|([-+]?[1-9][0-9]*)) {
175 yylval.number = strtol(yytext, NULL, 10);
176 return number;
177 }
178 ([0][0-7]+) {
179 yylval.number = strtol(yytext + 1, NULL, 8);
180 return number;
181 }
182 [a-zA-Z_][a-zA-Z0-9_]+ {
183 yylval.label = strdup(yytext);
184 return label;
185 }
186
187 "/*"([^\*]|\*[^/])*"*/" { /* NOP */ }
188 ";"[^\n]* { /* NOP */ }
189 ^#.* { /* NOP */ }
190 [ \t]+ { /* NOP */ }
191 [ \n]+ { /* NOP */ }
192
193 . {
194 printf("unknown character \'%s\'", yytext);
195 yyerror("lex unknown character");
196 }
197
198 %%
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