2 * netsniff-ng - the packet sniffing beast
3 * By Daniel Borkmann <daniel@netsniff-ng.org>
4 * Copyright 2011 Daniel Borkmann <dborkma@tik.ee.ethz.ch>,
5 * Swiss federal institute of technology (ETH Zurich)
6 * Subject to the GPL, version 2.
9 /* yaac-func-prefix: yy */
20 #include <linux/filter.h>
25 #include "bpf_parser.tab.h"
29 int compile_filter
(char *file
, int verbose
, int bypass
, int format
,
32 static int curr_instr
= 0;
34 static struct sock_filter out
[BPF_MAXINSNS
];
36 static char *labels
[BPF_MAXINSNS
];
37 static char *labels_jt
[BPF_MAXINSNS
];
38 static char *labels_jf
[BPF_MAXINSNS
];
39 static char *labels_k
[BPF_MAXINSNS
];
41 #define YYERROR_VERBOSE 0
43 #define YYENABLE_NLS 1
44 #define YYLTYPE_IS_TRIVIAL 1
48 extern
int yylex(void);
49 extern
void yyerror(const char *);
53 static inline
void check_max_instr
(void)
55 if
(curr_instr
>= BPF_MAXINSNS
)
56 panic
("Exceeded maximal number of instructions!\n");
59 static inline
void set_curr_instr
(uint16_t code
, uint8_t jt
, uint8_t jf
, uint32_t k
)
63 out
[curr_instr
].code
= code
;
64 out
[curr_instr
].jt
= jt
;
65 out
[curr_instr
].jf
= jf
;
66 out
[curr_instr
].k
= k
;
71 static inline
void set_curr_label
(char *label
)
75 labels
[curr_instr
] = label
;
82 static inline
void set_jmp_label
(char *label
, int which
)
88 labels_jt
[curr_instr
] = label
;
91 labels_jf
[curr_instr
] = label
;
94 labels_k
[curr_instr
] = label
;
101 static int find_intr_offset_or_panic
(char *label_to_search
)
103 int i
, max
= curr_instr
, ret
= -ENOENT
;
105 bug_on
(!label_to_search
);
107 for
(i
= 0; i
< max
; ++i
) {
108 if
(labels
[i
] != NULL
) {
109 /* Both are \0-terminated! */
110 if
(!strcmp
(label_to_search
, labels
[i
])) {
118 panic
("No such label!\n");
130 %token OP_LDB OP_LDH OP_LD OP_LDX OP_ST OP_STX OP_JMP OP_JEQ OP_JGT OP_JGE
131 %token OP_JSET OP_ADD OP_SUB OP_MUL OP_DIV OP_AND OP_OR OP_XOR OP_LSH OP_RSH
132 %token OP_RET OP_TAX OP_TXA OP_LDXB OP_MOD OP_NEG OP_JNEQ OP_JLT OP_JLE OP_LDI
135 %token K_PKT_LEN K_PROTO K_TYPE K_NLATTR K_NLATTR_NEST K_MARK K_QUEUE K_HATYPE
136 %token K_RXHASH K_CPU K_IFIDX K_VLANT K_VLANP K_POFF
138 %token
':' ',' '[' ']' '(' ')' 'x' 'a' '+' 'M' '*' '&' '#'
142 %type
<number
> number
195 : label
':' { set_curr_label
($1); }
199 : OP_LDB
'[' 'x' '+' number
']' {
200 set_curr_instr
(BPF_LD | BPF_B | BPF_IND
, 0, 0, $5); }
201 | OP_LDB
'[' number
']' {
202 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0, $3); }
204 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
205 SKF_AD_OFF
+ SKF_AD_PROTOCOL
); }
207 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
208 SKF_AD_OFF
+ SKF_AD_PKTTYPE
); }
210 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
211 SKF_AD_OFF
+ SKF_AD_IFINDEX
); }
213 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
214 SKF_AD_OFF
+ SKF_AD_NLATTR
); }
215 | OP_LDB K_NLATTR_NEST
{
216 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
217 SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
); }
219 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
220 SKF_AD_OFF
+ SKF_AD_MARK
); }
222 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
223 SKF_AD_OFF
+ SKF_AD_QUEUE
); }
225 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
226 SKF_AD_OFF
+ SKF_AD_HATYPE
); }
228 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
229 SKF_AD_OFF
+ SKF_AD_RXHASH
); }
231 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
232 SKF_AD_OFF
+ SKF_AD_CPU
); }
234 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
235 SKF_AD_OFF
+ SKF_AD_VLAN_TAG
); }
237 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
238 SKF_AD_OFF
+ SKF_AD_VLAN_TAG_PRESENT
); }
240 set_curr_instr
(BPF_LD | BPF_B | BPF_ABS
, 0, 0,
241 SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
); }
245 : OP_LDH
'[' 'x' '+' number
']' {
246 set_curr_instr
(BPF_LD | BPF_H | BPF_IND
, 0, 0, $5); }
247 | OP_LDH
'[' number
']' {
248 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0, $3); }
250 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
251 SKF_AD_OFF
+ SKF_AD_PROTOCOL
); }
253 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
254 SKF_AD_OFF
+ SKF_AD_PKTTYPE
); }
256 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
257 SKF_AD_OFF
+ SKF_AD_IFINDEX
); }
259 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
260 SKF_AD_OFF
+ SKF_AD_NLATTR
); }
261 | OP_LDH K_NLATTR_NEST
{
262 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
263 SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
); }
265 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
266 SKF_AD_OFF
+ SKF_AD_MARK
); }
268 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
269 SKF_AD_OFF
+ SKF_AD_QUEUE
); }
271 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
272 SKF_AD_OFF
+ SKF_AD_HATYPE
); }
274 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
275 SKF_AD_OFF
+ SKF_AD_RXHASH
); }
277 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
278 SKF_AD_OFF
+ SKF_AD_CPU
); }
280 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
281 SKF_AD_OFF
+ SKF_AD_VLAN_TAG
); }
283 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
284 SKF_AD_OFF
+ SKF_AD_VLAN_TAG_PRESENT
); }
286 set_curr_instr
(BPF_LD | BPF_H | BPF_ABS
, 0, 0,
287 SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
); }
292 set_curr_instr
(BPF_LD | BPF_IMM
, 0, 0, $2); }
297 set_curr_instr
(BPF_LD | BPF_IMM
, 0, 0, $3); }
299 set_curr_instr
(BPF_LD | BPF_W | BPF_LEN
, 0, 0, 0); }
301 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
302 SKF_AD_OFF
+ SKF_AD_PROTOCOL
); }
304 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
305 SKF_AD_OFF
+ SKF_AD_PKTTYPE
); }
307 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
308 SKF_AD_OFF
+ SKF_AD_IFINDEX
); }
310 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
311 SKF_AD_OFF
+ SKF_AD_NLATTR
); }
312 | OP_LD K_NLATTR_NEST
{
313 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
314 SKF_AD_OFF
+ SKF_AD_NLATTR_NEST
); }
316 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
317 SKF_AD_OFF
+ SKF_AD_MARK
); }
319 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
320 SKF_AD_OFF
+ SKF_AD_QUEUE
); }
322 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
323 SKF_AD_OFF
+ SKF_AD_HATYPE
); }
325 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
326 SKF_AD_OFF
+ SKF_AD_RXHASH
); }
328 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
329 SKF_AD_OFF
+ SKF_AD_CPU
); }
331 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
332 SKF_AD_OFF
+ SKF_AD_VLAN_TAG
); }
334 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
335 SKF_AD_OFF
+ SKF_AD_VLAN_TAG_PRESENT
); }
337 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0,
338 SKF_AD_OFF
+ SKF_AD_PAY_OFFSET
); }
339 | OP_LD
'M' '[' number
']' {
340 set_curr_instr
(BPF_LD | BPF_MEM
, 0, 0, $4); }
341 | OP_LD
'[' 'x' '+' number
']' {
342 set_curr_instr
(BPF_LD | BPF_W | BPF_IND
, 0, 0, $5); }
343 | OP_LD
'[' number
']' {
344 set_curr_instr
(BPF_LD | BPF_W | BPF_ABS
, 0, 0, $3); }
349 set_curr_instr
(BPF_LDX | BPF_IMM
, 0, 0, $2); }
353 : OP_LDX
'#' number
{
354 set_curr_instr
(BPF_LDX | BPF_IMM
, 0, 0, $3); }
356 set_curr_instr
(BPF_LDX | BPF_W | BPF_LEN
, 0, 0, 0); }
357 | OP_LDX
'M' '[' number
']' {
358 set_curr_instr
(BPF_LDX | BPF_MEM
, 0, 0, $4); }
359 | OP_LDXB number
'*' '(' '[' number
']' '&' number
')' {
360 if
($2 != 4 ||
$9 != 0xf) {
361 panic
("ldxb offset not supported!\n");
363 set_curr_instr
(BPF_LDX | BPF_MSH | BPF_B
, 0, 0, $6); } }
364 | OP_LDX number
'*' '(' '[' number
']' '&' number
')' {
365 if
($2 != 4 ||
$9 != 0xf) {
366 panic
("ldxb offset not supported!\n");
368 set_curr_instr
(BPF_LDX | BPF_MSH | BPF_B
, 0, 0, $6); } }
372 : OP_ST
'M' '[' number
']' {
373 set_curr_instr
(BPF_ST
, 0, 0, $4); }
377 : OP_STX
'M' '[' number
']' {
378 set_curr_instr
(BPF_STX
, 0, 0, $4); }
383 set_jmp_label
($2, JKL
);
384 set_curr_instr
(BPF_JMP | BPF_JA
, 0, 0, 0); }
388 : OP_JEQ
'#' number
',' label
',' label
{
389 set_jmp_label
($5, JTL
);
390 set_jmp_label
($7, JFL
);
391 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_K
, 0, 0, $3); }
392 | OP_JEQ
'x' ',' label
',' label
{
393 set_jmp_label
($4, JTL
);
394 set_jmp_label
($6, JFL
);
395 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_X
, 0, 0, 0); }
396 | OP_JEQ
'#' number
',' label
{
397 set_jmp_label
($5, JTL
);
398 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_K
, 0, 0, $3); }
399 | OP_JEQ
'x' ',' label
{
400 set_jmp_label
($4, JTL
);
401 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_X
, 0, 0, 0); }
405 : OP_JNEQ
'#' number
',' label
{
406 set_jmp_label
($5, JFL
);
407 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_K
, 0, 0, $3); }
408 | OP_JNEQ
'x' ',' label
{
409 set_jmp_label
($4, JFL
);
410 set_curr_instr
(BPF_JMP | BPF_JEQ | BPF_X
, 0, 0, 0); }
414 : OP_JLT
'#' number
',' label
{
415 set_jmp_label
($5, JFL
);
416 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_K
, 0, 0, $3); }
417 | OP_JLT
'x' ',' label
{
418 set_jmp_label
($4, JFL
);
419 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_X
, 0, 0, 0); }
423 : OP_JLE
'#' number
',' label
{
424 set_jmp_label
($5, JFL
);
425 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_K
, 0, 0, $3); }
426 | OP_JLE
'x' ',' label
{
427 set_jmp_label
($4, JFL
);
428 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_X
, 0, 0, 0); }
432 : OP_JGT
'#' number
',' label
',' label
{
433 set_jmp_label
($5, JTL
);
434 set_jmp_label
($7, JFL
);
435 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_K
, 0, 0, $3); }
436 | OP_JGT
'x' ',' label
',' label
{
437 set_jmp_label
($4, JTL
);
438 set_jmp_label
($6, JFL
);
439 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_X
, 0, 0, 0); }
440 | OP_JGT
'#' number
',' label
{
441 set_jmp_label
($5, JTL
);
442 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_K
, 0, 0, $3); }
443 | OP_JGT
'x' ',' label
{
444 set_jmp_label
($4, JTL
);
445 set_curr_instr
(BPF_JMP | BPF_JGT | BPF_X
, 0, 0, 0); }
449 : OP_JGE
'#' number
',' label
',' label
{
450 set_jmp_label
($5, JTL
);
451 set_jmp_label
($7, JFL
);
452 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_K
, 0, 0, $3); }
453 | OP_JGE
'x' ',' label
',' label
{
454 set_jmp_label
($4, JTL
);
455 set_jmp_label
($6, JFL
);
456 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_X
, 0, 0, 0); }
457 | OP_JGE
'#' number
',' label
{
458 set_jmp_label
($5, JTL
);
459 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_K
, 0, 0, $3); }
460 | OP_JGE
'x' ',' label
{
461 set_jmp_label
($4, JTL
);
462 set_curr_instr
(BPF_JMP | BPF_JGE | BPF_X
, 0, 0, 0); }
466 : OP_JSET
'#' number
',' label
',' label
{
467 set_jmp_label
($5, JTL
);
468 set_jmp_label
($7, JFL
);
469 set_curr_instr
(BPF_JMP | BPF_JSET | BPF_K
, 0, 0, $3); }
470 | OP_JSET
'x' ',' label
',' label
{
471 set_jmp_label
($4, JTL
);
472 set_jmp_label
($6, JFL
);
473 set_curr_instr
(BPF_JMP | BPF_JSET | BPF_X
, 0, 0, 0); }
474 | OP_JSET
'#' number
',' label
{
475 set_jmp_label
($5, JTL
);
476 set_curr_instr
(BPF_JMP | BPF_JSET | BPF_K
, 0, 0, $3); }
477 | OP_JSET
'x' ',' label
{
478 set_jmp_label
($4, JTL
);
479 set_curr_instr
(BPF_JMP | BPF_JSET | BPF_X
, 0, 0, 0); }
483 : OP_ADD
'#' number
{
484 set_curr_instr
(BPF_ALU | BPF_ADD | BPF_K
, 0, 0, $3); }
486 set_curr_instr
(BPF_ALU | BPF_ADD | BPF_X
, 0, 0, 0); }
490 : OP_SUB
'#' number
{
491 set_curr_instr
(BPF_ALU | BPF_SUB | BPF_K
, 0, 0, $3); }
493 set_curr_instr
(BPF_ALU | BPF_SUB | BPF_X
, 0, 0, 0); }
497 : OP_MUL
'#' number
{
498 set_curr_instr
(BPF_ALU | BPF_MUL | BPF_K
, 0, 0, $3); }
500 set_curr_instr
(BPF_ALU | BPF_MUL | BPF_X
, 0, 0, 0); }
504 : OP_DIV
'#' number
{
505 set_curr_instr
(BPF_ALU | BPF_DIV | BPF_K
, 0, 0, $3); }
507 set_curr_instr
(BPF_ALU | BPF_DIV | BPF_X
, 0, 0, 0); }
511 : OP_MOD
'#' number
{
512 set_curr_instr
(BPF_ALU | BPF_MOD | BPF_K
, 0, 0, $3); }
514 set_curr_instr
(BPF_ALU | BPF_MOD | BPF_X
, 0, 0, 0); }
519 set_curr_instr
(BPF_ALU | BPF_NEG
, 0, 0, 0); }
523 : OP_AND
'#' number
{
524 set_curr_instr
(BPF_ALU | BPF_AND | BPF_K
, 0, 0, $3); }
526 set_curr_instr
(BPF_ALU | BPF_AND | BPF_X
, 0, 0, 0); }
531 set_curr_instr
(BPF_ALU | BPF_OR | BPF_K
, 0, 0, $3); }
533 set_curr_instr
(BPF_ALU | BPF_OR | BPF_X
, 0, 0, 0); }
537 : OP_XOR
'#' number
{
538 set_curr_instr
(BPF_ALU | BPF_XOR | BPF_K
, 0, 0, $3); }
540 set_curr_instr
(BPF_ALU | BPF_XOR | BPF_X
, 0, 0, 0); }
544 : OP_LSH
'#' number
{
545 set_curr_instr
(BPF_ALU | BPF_LSH | BPF_K
, 0, 0, $3); }
547 set_curr_instr
(BPF_ALU | BPF_LSH | BPF_X
, 0, 0, 0); }
551 : OP_RSH
'#' number
{
552 set_curr_instr
(BPF_ALU | BPF_RSH | BPF_K
, 0, 0, $3); }
554 set_curr_instr
(BPF_ALU | BPF_RSH | BPF_X
, 0, 0, 0); }
559 set_curr_instr
(BPF_RET | BPF_A
, 0, 0, 0); }
561 set_curr_instr
(BPF_RET | BPF_X
, 0, 0, 0); }
562 | OP_RET
'#' number
{
563 set_curr_instr
(BPF_RET | BPF_K
, 0, 0, $3); }
568 set_curr_instr
(BPF_MISC | BPF_TAX
, 0, 0, 0); }
573 set_curr_instr
(BPF_MISC | BPF_TXA
, 0, 0, 0); }
578 static void stage_1_inline
(void)
583 static void stage_2_label_reduce
(void)
585 int i
, max
= curr_instr
, off
;
587 /* 1. reduce k jumps */
588 for
(i
= 0; i
< max
; ++i
) {
589 if
(labels_k
[i
] != NULL
) {
590 off
= find_intr_offset_or_panic
(labels_k
[i
]);
591 out
[i
].k
= (uint32_t) (off
- i
- 1);
595 /* 1. reduce jt jumps */
596 for
(i
= 0; i
< max
; ++i
) {
597 if
(labels_jt
[i
] != NULL
) {
598 off
= find_intr_offset_or_panic
(labels_jt
[i
]);
599 out
[i
].jt
= (uint8_t) (off
- i
-1);
603 /* 1. reduce jf jumps */
604 for
(i
= 0; i
< max
; ++i
) {
605 if
(labels_jf
[i
] != NULL
) {
606 off
= find_intr_offset_or_panic
(labels_jf
[i
]);
607 out
[i
].jf
= (uint8_t) (off
- i
- 1);
612 static void pretty_printer_c
(const struct sock_fprog
*prog
)
616 for
(i
= 0; i
< prog
->len
; ++i
) {
617 printf
("{ 0x%x, %u, %u, 0x%08x },\n",
618 prog
->filter
[i
].code
, prog
->filter
[i
].jt
,
619 prog
->filter
[i
].jf
, prog
->filter
[i
].k
);
623 static void pretty_printer_xt_bpf
(const struct sock_fprog
*prog
)
627 printf
("%d,", prog
->len
);
628 for
(i
= 0; i
< prog
->len
; ++i
) {
629 printf
("%u %u %u %u,",
630 prog
->filter
[i
].code
, prog
->filter
[i
].jt
,
631 prog
->filter
[i
].jf
, prog
->filter
[i
].k
);
637 static void pretty_printer_tcpdump
(const struct sock_fprog
*prog
)
641 for
(i
= 0; i
< prog
->len
; ++i
) {
642 printf
("%u %u %u %u\n",
643 prog
->filter
[i
].code
, prog
->filter
[i
].jt
,
644 prog
->filter
[i
].jf
, prog
->filter
[i
].k
);
648 static void pretty_printer
(const struct sock_fprog
*prog
, int format
)
652 pretty_printer_c
(prog
);
655 pretty_printer_xt_bpf
(prog
);
658 pretty_printer_tcpdump
(prog
);
665 int compile_filter
(char *file
, int verbose
, int bypass
, int format
,
669 struct sock_fprog res
;
672 memset
(tmp_file
, 0, sizeof
(tmp_file
));
675 char cmd
[256], *dir
, *base
, *a
, *b
;
677 dir
= dirname
((a
= xstrdup
(file
)));
678 base
= basename
((b
= xstrdup
(file
)));
680 slprintf
(tmp_file
, sizeof
(tmp_file
), "%s/.tmp-%u-%s", dir
, rand
(), base
);
681 slprintf
(cmd
, sizeof
(cmd
), "cpp -I" PREFIX_STRING
682 "/etc/netsniff-ng/ %s > %s", file
, tmp_file
);
690 if
(!strncmp
("-", file
, strlen
("-")))
693 yyin
= fopen
(file
, "r");
695 panic
("Cannot open file!\n");
697 memset
(out
, 0, sizeof
(out
));
698 memset
(labels
, 0, sizeof
(labels
));
699 memset
(labels_jf
, 0, sizeof
(labels_jf
));
700 memset
(labels_jt
, 0, sizeof
(labels_jt
));
701 memset
(labels_k
, 0, sizeof
(labels_k
));
704 stage_2_label_reduce
();
707 res.len
= curr_instr
;
710 printf
("Generated program:\n");
716 printf
("Validating: ");
720 if
(__bpf_validate
(&res
) == 0) {
722 printf
("Semantic error! BPF validation failed!\n");
724 panic
("Semantic error! BPF validation failed! "
725 "Try -V for debugging output!\n");
726 } else if
(verbose
) {
727 printf
("is runnable!\n");
734 pretty_printer
(&res
, format
);
736 for
(i
= 0; i
< res.len
; ++i
) {
750 void yyerror(const char *err
)
752 panic
("Syntax error at line %d: %s! %s!\n",
753 yylineno
, yytext
, err
);