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filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
/*
* BPF asm code parser
*
* 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 <string.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdbool.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <linux/filter.h>
#include "bpf_exp.yacc.h"
enum jmp_type { JTL, JFL, JKL };
extern FILE *yyin;
extern int yylex(void);
extern void yyerror(const char *str);
extern void bpf_asm_compile(FILE *fp, bool cstyle);
static void bpf_set_curr_instr(uint16_t op, uint8_t jt, uint8_t jf, uint32_t k);
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
static void bpf_set_curr_label(char *label);
static void bpf_set_jmp_label(char *label, enum jmp_type type);
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
%}
%union {
char *label;
uint32_t number;
}
%token OP_LDB OP_LDH OP_LD OP_LDX OP_ST OP_STX OP_JMP OP_JEQ OP_JGT OP_JGE
%token OP_JSET OP_ADD OP_SUB OP_MUL OP_DIV OP_AND OP_OR OP_XOR OP_LSH OP_RSH
%token OP_RET OP_TAX OP_TXA OP_LDXB OP_MOD OP_NEG OP_JNEQ OP_JLT OP_JLE OP_LDI
%token OP_LDXI
%token K_PKT_LEN K_PROTO K_TYPE K_NLATTR K_NLATTR_NEST K_MARK K_QUEUE K_HATYPE
%token K_RXHASH K_CPU K_IFIDX K_VLANT K_VLANP K_POFF
%token ':' ',' '[' ']' '(' ')' 'x' 'a' '+' 'M' '*' '&' '#' '%'
%token number label
%type <label> label
%type <number> number
%%
prog
: line
| prog line
;
line
: instr
| labelled_instr
;
labelled_instr
: labelled instr
;
instr
: ldb
| ldh
| ld
| ldi
| ldx
| ldxi
| st
| stx
| jmp
| jeq
| jneq
| jlt
| jle
| jgt
| jge
| jset
| add
| sub
| mul
| div
| mod
| neg
| and
| or
| xor
| lsh
| rsh
| ret
| tax
| txa
;
labelled
: label ':' { bpf_set_curr_label($1); }
;
ldb
: OP_LDB '[' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_IND, 0, 0, $5); }
| OP_LDB '[' '%' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_IND, 0, 0, $6); }
| OP_LDB '[' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0, $3); }
| OP_LDB K_PROTO {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PROTOCOL); }
| OP_LDB K_TYPE {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PKTTYPE); }
| OP_LDB K_IFIDX {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_IFINDEX); }
| OP_LDB K_NLATTR {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR); }
| OP_LDB K_NLATTR_NEST {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR_NEST); }
| OP_LDB K_MARK {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_MARK); }
| OP_LDB K_QUEUE {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_QUEUE); }
| OP_LDB K_HATYPE {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_HATYPE); }
| OP_LDB K_RXHASH {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RXHASH); }
| OP_LDB K_CPU {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_CPU); }
| OP_LDB K_VLANT {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG); }
| OP_LDB K_VLANP {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT); }
| OP_LDB K_POFF {
bpf_set_curr_instr(BPF_LD | BPF_B | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PAY_OFFSET); }
;
ldh
: OP_LDH '[' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_IND, 0, 0, $5); }
| OP_LDH '[' '%' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_IND, 0, 0, $6); }
| OP_LDH '[' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0, $3); }
| OP_LDH K_PROTO {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PROTOCOL); }
| OP_LDH K_TYPE {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PKTTYPE); }
| OP_LDH K_IFIDX {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_IFINDEX); }
| OP_LDH K_NLATTR {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR); }
| OP_LDH K_NLATTR_NEST {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR_NEST); }
| OP_LDH K_MARK {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_MARK); }
| OP_LDH K_QUEUE {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_QUEUE); }
| OP_LDH K_HATYPE {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_HATYPE); }
| OP_LDH K_RXHASH {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RXHASH); }
| OP_LDH K_CPU {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_CPU); }
| OP_LDH K_VLANT {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG); }
| OP_LDH K_VLANP {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT); }
| OP_LDH K_POFF {
bpf_set_curr_instr(BPF_LD | BPF_H | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PAY_OFFSET); }
;
ldi
: OP_LDI '#' number {
bpf_set_curr_instr(BPF_LD | BPF_IMM, 0, 0, $3); }
| OP_LDI number {
bpf_set_curr_instr(BPF_LD | BPF_IMM, 0, 0, $2); }
;
ld
: OP_LD '#' number {
bpf_set_curr_instr(BPF_LD | BPF_IMM, 0, 0, $3); }
| OP_LD K_PKT_LEN {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_LEN, 0, 0, 0); }
| OP_LD K_PROTO {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PROTOCOL); }
| OP_LD K_TYPE {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PKTTYPE); }
| OP_LD K_IFIDX {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_IFINDEX); }
| OP_LD K_NLATTR {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR); }
| OP_LD K_NLATTR_NEST {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_NLATTR_NEST); }
| OP_LD K_MARK {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_MARK); }
| OP_LD K_QUEUE {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_QUEUE); }
| OP_LD K_HATYPE {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_HATYPE); }
| OP_LD K_RXHASH {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_RXHASH); }
| OP_LD K_CPU {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_CPU); }
| OP_LD K_VLANT {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG); }
| OP_LD K_VLANP {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT); }
| OP_LD K_POFF {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0,
SKF_AD_OFF + SKF_AD_PAY_OFFSET); }
| OP_LD 'M' '[' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_MEM, 0, 0, $4); }
| OP_LD '[' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_IND, 0, 0, $5); }
| OP_LD '[' '%' 'x' '+' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_IND, 0, 0, $6); }
| OP_LD '[' number ']' {
bpf_set_curr_instr(BPF_LD | BPF_W | BPF_ABS, 0, 0, $3); }
;
ldxi
: OP_LDXI '#' number {
bpf_set_curr_instr(BPF_LDX | BPF_IMM, 0, 0, $3); }
| OP_LDXI number {
bpf_set_curr_instr(BPF_LDX | BPF_IMM, 0, 0, $2); }
;
ldx
: OP_LDX '#' number {
bpf_set_curr_instr(BPF_LDX | BPF_IMM, 0, 0, $3); }
| OP_LDX K_PKT_LEN {
bpf_set_curr_instr(BPF_LDX | BPF_W | BPF_LEN, 0, 0, 0); }
| OP_LDX 'M' '[' number ']' {
bpf_set_curr_instr(BPF_LDX | BPF_MEM, 0, 0, $4); }
| OP_LDXB number '*' '(' '[' number ']' '&' number ')' {
if ($2 != 4 || $9 != 0xf) {
fprintf(stderr, "ldxb offset not supported!\n");
exit(0);
} else {
bpf_set_curr_instr(BPF_LDX | BPF_MSH | BPF_B, 0, 0, $6); } }
| OP_LDX number '*' '(' '[' number ']' '&' number ')' {
if ($2 != 4 || $9 != 0xf) {
fprintf(stderr, "ldxb offset not supported!\n");
exit(0);
} else {
bpf_set_curr_instr(BPF_LDX | BPF_MSH | BPF_B, 0, 0, $6); } }
;
st
: OP_ST 'M' '[' number ']' {
bpf_set_curr_instr(BPF_ST, 0, 0, $4); }
;
stx
: OP_STX 'M' '[' number ']' {
bpf_set_curr_instr(BPF_STX, 0, 0, $4); }
;
jmp
: OP_JMP label {
bpf_set_jmp_label($2, JKL);
bpf_set_curr_instr(BPF_JMP | BPF_JA, 0, 0, 0); }
;
jeq
: OP_JEQ '#' number ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_K, 0, 0, $3); }
| OP_JEQ 'x' ',' label ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_jmp_label($6, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
| OP_JEQ '%' 'x' ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
| OP_JEQ '#' number ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_K, 0, 0, $3); }
| OP_JEQ 'x' ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
| OP_JEQ '%' 'x' ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
;
jneq
: OP_JNEQ '#' number ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_K, 0, 0, $3); }
| OP_JNEQ 'x' ',' label {
bpf_set_jmp_label($4, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
| OP_JNEQ '%' 'x' ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JEQ | BPF_X, 0, 0, 0); }
;
jlt
: OP_JLT '#' number ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_K, 0, 0, $3); }
| OP_JLT 'x' ',' label {
bpf_set_jmp_label($4, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
| OP_JLT '%' 'x' ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
;
jle
: OP_JLE '#' number ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_K, 0, 0, $3); }
| OP_JLE 'x' ',' label {
bpf_set_jmp_label($4, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
| OP_JLE '%' 'x' ',' label {
bpf_set_jmp_label($5, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
;
jgt
: OP_JGT '#' number ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_K, 0, 0, $3); }
| OP_JGT 'x' ',' label ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_jmp_label($6, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
| OP_JGT '%' 'x' ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
| OP_JGT '#' number ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_K, 0, 0, $3); }
| OP_JGT 'x' ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
| OP_JGT '%' 'x' ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGT | BPF_X, 0, 0, 0); }
;
jge
: OP_JGE '#' number ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_K, 0, 0, $3); }
| OP_JGE 'x' ',' label ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_jmp_label($6, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
| OP_JGE '%' 'x' ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
| OP_JGE '#' number ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_K, 0, 0, $3); }
| OP_JGE 'x' ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
| OP_JGE '%' 'x' ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JGE | BPF_X, 0, 0, 0); }
;
jset
: OP_JSET '#' number ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_K, 0, 0, $3); }
| OP_JSET 'x' ',' label ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_jmp_label($6, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_X, 0, 0, 0); }
| OP_JSET '%' 'x' ',' label ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_jmp_label($7, JFL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_X, 0, 0, 0); }
| OP_JSET '#' number ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_K, 0, 0, $3); }
| OP_JSET 'x' ',' label {
bpf_set_jmp_label($4, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_X, 0, 0, 0); }
| OP_JSET '%' 'x' ',' label {
bpf_set_jmp_label($5, JTL);
bpf_set_curr_instr(BPF_JMP | BPF_JSET | BPF_X, 0, 0, 0); }
;
add
: OP_ADD '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_ADD | BPF_K, 0, 0, $3); }
| OP_ADD 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_ADD | BPF_X, 0, 0, 0); }
| OP_ADD '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_ADD | BPF_X, 0, 0, 0); }
;
sub
: OP_SUB '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_SUB | BPF_K, 0, 0, $3); }
| OP_SUB 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_SUB | BPF_X, 0, 0, 0); }
| OP_SUB '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_SUB | BPF_X, 0, 0, 0); }
;
mul
: OP_MUL '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_MUL | BPF_K, 0, 0, $3); }
| OP_MUL 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_MUL | BPF_X, 0, 0, 0); }
| OP_MUL '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_MUL | BPF_X, 0, 0, 0); }
;
div
: OP_DIV '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_DIV | BPF_K, 0, 0, $3); }
| OP_DIV 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_DIV | BPF_X, 0, 0, 0); }
| OP_DIV '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_DIV | BPF_X, 0, 0, 0); }
;
mod
: OP_MOD '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_MOD | BPF_K, 0, 0, $3); }
| OP_MOD 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_MOD | BPF_X, 0, 0, 0); }
| OP_MOD '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_MOD | BPF_X, 0, 0, 0); }
;
neg
: OP_NEG {
bpf_set_curr_instr(BPF_ALU | BPF_NEG, 0, 0, 0); }
;
and
: OP_AND '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_AND | BPF_K, 0, 0, $3); }
| OP_AND 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_AND | BPF_X, 0, 0, 0); }
| OP_AND '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_AND | BPF_X, 0, 0, 0); }
;
or
: OP_OR '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_OR | BPF_K, 0, 0, $3); }
| OP_OR 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_OR | BPF_X, 0, 0, 0); }
| OP_OR '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_OR | BPF_X, 0, 0, 0); }
;
xor
: OP_XOR '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_XOR | BPF_K, 0, 0, $3); }
| OP_XOR 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_XOR | BPF_X, 0, 0, 0); }
| OP_XOR '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_XOR | BPF_X, 0, 0, 0); }
;
lsh
: OP_LSH '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_LSH | BPF_K, 0, 0, $3); }
| OP_LSH 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_LSH | BPF_X, 0, 0, 0); }
| OP_LSH '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_LSH | BPF_X, 0, 0, 0); }
;
rsh
: OP_RSH '#' number {
bpf_set_curr_instr(BPF_ALU | BPF_RSH | BPF_K, 0, 0, $3); }
| OP_RSH 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_RSH | BPF_X, 0, 0, 0); }
| OP_RSH '%' 'x' {
bpf_set_curr_instr(BPF_ALU | BPF_RSH | BPF_X, 0, 0, 0); }
;
ret
: OP_RET 'a' {
bpf_set_curr_instr(BPF_RET | BPF_A, 0, 0, 0); }
| OP_RET '%' 'a' {
bpf_set_curr_instr(BPF_RET | BPF_A, 0, 0, 0); }
| OP_RET 'x' {
bpf_set_curr_instr(BPF_RET | BPF_X, 0, 0, 0); }
| OP_RET '%' 'x' {
bpf_set_curr_instr(BPF_RET | BPF_X, 0, 0, 0); }
| OP_RET '#' number {
bpf_set_curr_instr(BPF_RET | BPF_K, 0, 0, $3); }
;
tax
: OP_TAX {
bpf_set_curr_instr(BPF_MISC | BPF_TAX, 0, 0, 0); }
;
txa
: OP_TXA {
bpf_set_curr_instr(BPF_MISC | BPF_TXA, 0, 0, 0); }
;
%%
static int curr_instr = 0;
static struct sock_filter out[BPF_MAXINSNS];
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
static char **labels, **labels_jt, **labels_jf, **labels_k;
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
static void bpf_assert_max(void)
{
if (curr_instr >= BPF_MAXINSNS) {
fprintf(stderr, "only max %u insns allowed!\n", BPF_MAXINSNS);
exit(0);
}
}
static void bpf_set_curr_instr(uint16_t code, uint8_t jt, uint8_t jf,
uint32_t k)
{
bpf_assert_max();
out[curr_instr].code = code;
out[curr_instr].jt = jt;
out[curr_instr].jf = jf;
out[curr_instr].k = k;
curr_instr++;
}
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
static void bpf_set_curr_label(char *label)
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
{
bpf_assert_max();
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
labels[curr_instr] = label;
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
}
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
static void bpf_set_jmp_label(char *label, enum jmp_type type)
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
{
bpf_assert_max();
switch (type) {
case JTL:
labels_jt[curr_instr] = label;
break;
case JFL:
labels_jf[curr_instr] = label;
break;
case JKL:
labels_k[curr_instr] = label;
break;
}
}
static int bpf_find_insns_offset(const char *label)
{
int i, max = curr_instr, ret = -ENOENT;
for (i = 0; i < max; i++) {
if (labels[i] && !strcmp(label, labels[i])) {
ret = i;
break;
}
}
if (ret == -ENOENT) {
fprintf(stderr, "no such label \'%s\'!\n", label);
exit(0);
}
return ret;
}
static void bpf_stage_1_insert_insns(void)
{
yyparse();
}
static void bpf_reduce_k_jumps(void)
{
int i;
for (i = 0; i < curr_instr; i++) {
if (labels_k[i]) {
int off = bpf_find_insns_offset(labels_k[i]);
out[i].k = (uint32_t) (off - i - 1);
}
}
}
static void bpf_reduce_jt_jumps(void)
{
int i;
for (i = 0; i < curr_instr; i++) {
if (labels_jt[i]) {
int off = bpf_find_insns_offset(labels_jt[i]);
out[i].jt = (uint8_t) (off - i -1);
}
}
}
static void bpf_reduce_jf_jumps(void)
{
int i;
for (i = 0; i < curr_instr; i++) {
if (labels_jf[i]) {
int off = bpf_find_insns_offset(labels_jf[i]);
out[i].jf = (uint8_t) (off - i - 1);
}
}
}
static void bpf_stage_2_reduce_labels(void)
{
bpf_reduce_k_jumps();
bpf_reduce_jt_jumps();
bpf_reduce_jf_jumps();
}
static void bpf_pretty_print_c(void)
{
int i;
for (i = 0; i < curr_instr; i++)
printf("{ %#04x, %2u, %2u, %#010x },\n", out[i].code,
out[i].jt, out[i].jf, out[i].k);
}
static void bpf_pretty_print(void)
{
int i;
printf("%u,", curr_instr);
for (i = 0; i < curr_instr; i++)
printf("%u %u %u %u,", out[i].code,
out[i].jt, out[i].jf, out[i].k);
printf("\n");
}
static void bpf_init(void)
{
memset(out, 0, sizeof(out));
labels = calloc(BPF_MAXINSNS, sizeof(*labels));
assert(labels);
labels_jt = calloc(BPF_MAXINSNS, sizeof(*labels_jt));
assert(labels_jt);
labels_jf = calloc(BPF_MAXINSNS, sizeof(*labels_jf));
assert(labels_jf);
labels_k = calloc(BPF_MAXINSNS, sizeof(*labels_k));
assert(labels_k);
}
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
static void bpf_destroy_labels(void)
{
int i;
for (i = 0; i < curr_instr; i++) {
free(labels_jf[i]);
free(labels_jt[i]);
free(labels_k[i]);
free(labels[i]);
}
}
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
static void bpf_destroy(void)
{
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
bpf_destroy_labels();
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
free(labels_jt);
free(labels_jf);
free(labels_k);
bpf_exp: free duplicated labels at exit time Valgrind found that extracted labels that are passed from the lexer weren't freed upon exit. Therefore, add a small helper function that walks label tables and frees them. Since also NULL can be passed to free(3), we do not need to take care of that here. While at it, fix up a spacing error in bpf_set_curr_label(). Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-16 11:45:01 +01:00
free(labels);
filter: bpf_asm: add minimal bpf asm tool There are a couple of valid use cases for a minimal low-level bpf asm like tool, for example, using/linking to libpcap is not an option, the required BPF filters use Linux extensions that are not supported by libpcap's compiler, a filter might be more complex and not cleanly implementable with libpcap's compiler, particular filter codes should be optimized differently than libpcap's internal BPF compiler does, or for security audits of emitted BPF JIT code for prepared set of BPF instructions resp. BPF JIT compiler development in general. Then, in such cases writing such a filter in low-level syntax can be an good alternative, for example, xt_bpf and cls_bpf users might have requirements that could result in more complex filter code, or one that cannot be expressed with libpcap (e.g. different return codes in cls_bpf for flowids on various BPF code paths). Moreover, BPF JIT implementors may wish to manually write test cases in order to verify the resulting JIT image, and thus need low-level access to BPF code generation as well. Therefore, complete the available toolchain for BPF with this small bpf_asm helper tool for the tools/net/ directory. These 3 complementary minimal helper tools round up and facilitate BPF development. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-11 23:43:44 +01:00
}
void bpf_asm_compile(FILE *fp, bool cstyle)
{
yyin = fp;
bpf_init();
bpf_stage_1_insert_insns();
bpf_stage_2_reduce_labels();
bpf_destroy();
if (cstyle)
bpf_pretty_print_c();
else
bpf_pretty_print();
if (fp != stdin)
fclose(yyin);
}
void yyerror(const char *str)
{
exit(1);
}
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