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3f356385 DB |
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> | |
b1d95ae5 RB |
26 | #include <string.h> |
27 | ||
28 | #include <linux/filter.h> | |
3f356385 DB |
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; } | |
b1d95ae5 RB |
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 | } | |
3f356385 DB |
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 | } | |
b3bbba35 | 178 | ([0][0-7]+) { |
3f356385 DB |
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 | %% |