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filter: cleanup codes[] init

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Starting the translated instruction to 1 instead of 0 allows us to
remove one descrement at check time and makes codes[] array init
cleaner.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-11-18 21:56:38 +00:00 committed by David S. Miller
parent 93aaae2e01
commit 8c1592d68b
1 changed files with 47 additions and 48 deletions
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95
net/core/filter.c
View File

@ -39,7 +39,7 @@
#include <linux/filter.h>
enum {
BPF_S_RET_K = 0,
BPF_S_RET_K = 1,
BPF_S_RET_A,
BPF_S_ALU_ADD_K,
BPF_S_ALU_ADD_X,
@ -439,51 +439,51 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
* Invalid instructions are initialized to 0.
*/
static const u8 codes[] = {
[BPF_ALU|BPF_ADD|BPF_K] = BPF_S_ALU_ADD_K + 1,
[BPF_ALU|BPF_ADD|BPF_X] = BPF_S_ALU_ADD_X + 1,
[BPF_ALU|BPF_SUB|BPF_K] = BPF_S_ALU_SUB_K + 1,
[BPF_ALU|BPF_SUB|BPF_X] = BPF_S_ALU_SUB_X + 1,
[BPF_ALU|BPF_MUL|BPF_K] = BPF_S_ALU_MUL_K + 1,
[BPF_ALU|BPF_MUL|BPF_X] = BPF_S_ALU_MUL_X + 1,
[BPF_ALU|BPF_DIV|BPF_X] = BPF_S_ALU_DIV_X + 1,
[BPF_ALU|BPF_AND|BPF_K] = BPF_S_ALU_AND_K + 1,
[BPF_ALU|BPF_AND|BPF_X] = BPF_S_ALU_AND_X + 1,
[BPF_ALU|BPF_OR|BPF_K] = BPF_S_ALU_OR_K + 1,
[BPF_ALU|BPF_OR|BPF_X] = BPF_S_ALU_OR_X + 1,
[BPF_ALU|BPF_LSH|BPF_K] = BPF_S_ALU_LSH_K + 1,
[BPF_ALU|BPF_LSH|BPF_X] = BPF_S_ALU_LSH_X + 1,
[BPF_ALU|BPF_RSH|BPF_K] = BPF_S_ALU_RSH_K + 1,
[BPF_ALU|BPF_RSH|BPF_X] = BPF_S_ALU_RSH_X + 1,
[BPF_ALU|BPF_NEG] = BPF_S_ALU_NEG + 1,
[BPF_LD|BPF_W|BPF_ABS] = BPF_S_LD_W_ABS + 1,
[BPF_LD|BPF_H|BPF_ABS] = BPF_S_LD_H_ABS + 1,
[BPF_LD|BPF_B|BPF_ABS] = BPF_S_LD_B_ABS + 1,
[BPF_LD|BPF_W|BPF_LEN] = BPF_S_LD_W_LEN + 1,
[BPF_LD|BPF_W|BPF_IND] = BPF_S_LD_W_IND + 1,
[BPF_LD|BPF_H|BPF_IND] = BPF_S_LD_H_IND + 1,
[BPF_LD|BPF_B|BPF_IND] = BPF_S_LD_B_IND + 1,
[BPF_LD|BPF_IMM] = BPF_S_LD_IMM + 1,
[BPF_LDX|BPF_W|BPF_LEN] = BPF_S_LDX_W_LEN + 1,
[BPF_LDX|BPF_B|BPF_MSH] = BPF_S_LDX_B_MSH + 1,
[BPF_LDX|BPF_IMM] = BPF_S_LDX_IMM + 1,
[BPF_MISC|BPF_TAX] = BPF_S_MISC_TAX + 1,
[BPF_MISC|BPF_TXA] = BPF_S_MISC_TXA + 1,
[BPF_RET|BPF_K] = BPF_S_RET_K + 1,
[BPF_RET|BPF_A] = BPF_S_RET_A + 1,
[BPF_ALU|BPF_DIV|BPF_K] = BPF_S_ALU_DIV_K + 1,
[BPF_LD|BPF_MEM] = BPF_S_LD_MEM + 1,
[BPF_LDX|BPF_MEM] = BPF_S_LDX_MEM + 1,
[BPF_ST] = BPF_S_ST + 1,
[BPF_STX] = BPF_S_STX + 1,
[BPF_JMP|BPF_JA] = BPF_S_JMP_JA + 1,
[BPF_JMP|BPF_JEQ|BPF_K] = BPF_S_JMP_JEQ_K + 1,
[BPF_JMP|BPF_JEQ|BPF_X] = BPF_S_JMP_JEQ_X + 1,
[BPF_JMP|BPF_JGE|BPF_K] = BPF_S_JMP_JGE_K + 1,
[BPF_JMP|BPF_JGE|BPF_X] = BPF_S_JMP_JGE_X + 1,
[BPF_JMP|BPF_JGT|BPF_K] = BPF_S_JMP_JGT_K + 1,
[BPF_JMP|BPF_JGT|BPF_X] = BPF_S_JMP_JGT_X + 1,
[BPF_JMP|BPF_JSET|BPF_K] = BPF_S_JMP_JSET_K + 1,
[BPF_JMP|BPF_JSET|BPF_X] = BPF_S_JMP_JSET_X + 1,
[BPF_ALU|BPF_ADD|BPF_K] = BPF_S_ALU_ADD_K,
[BPF_ALU|BPF_ADD|BPF_X] = BPF_S_ALU_ADD_X,
[BPF_ALU|BPF_SUB|BPF_K] = BPF_S_ALU_SUB_K,
[BPF_ALU|BPF_SUB|BPF_X] = BPF_S_ALU_SUB_X,
[BPF_ALU|BPF_MUL|BPF_K] = BPF_S_ALU_MUL_K,
[BPF_ALU|BPF_MUL|BPF_X] = BPF_S_ALU_MUL_X,
[BPF_ALU|BPF_DIV|BPF_X] = BPF_S_ALU_DIV_X,
[BPF_ALU|BPF_AND|BPF_K] = BPF_S_ALU_AND_K,
[BPF_ALU|BPF_AND|BPF_X] = BPF_S_ALU_AND_X,
[BPF_ALU|BPF_OR|BPF_K] = BPF_S_ALU_OR_K,
[BPF_ALU|BPF_OR|BPF_X] = BPF_S_ALU_OR_X,
[BPF_ALU|BPF_LSH|BPF_K] = BPF_S_ALU_LSH_K,
[BPF_ALU|BPF_LSH|BPF_X] = BPF_S_ALU_LSH_X,
[BPF_ALU|BPF_RSH|BPF_K] = BPF_S_ALU_RSH_K,
[BPF_ALU|BPF_RSH|BPF_X] = BPF_S_ALU_RSH_X,
[BPF_ALU|BPF_NEG] = BPF_S_ALU_NEG,
[BPF_LD|BPF_W|BPF_ABS] = BPF_S_LD_W_ABS,
[BPF_LD|BPF_H|BPF_ABS] = BPF_S_LD_H_ABS,
[BPF_LD|BPF_B|BPF_ABS] = BPF_S_LD_B_ABS,
[BPF_LD|BPF_W|BPF_LEN] = BPF_S_LD_W_LEN,
[BPF_LD|BPF_W|BPF_IND] = BPF_S_LD_W_IND,
[BPF_LD|BPF_H|BPF_IND] = BPF_S_LD_H_IND,
[BPF_LD|BPF_B|BPF_IND] = BPF_S_LD_B_IND,
[BPF_LD|BPF_IMM] = BPF_S_LD_IMM,
[BPF_LDX|BPF_W|BPF_LEN] = BPF_S_LDX_W_LEN,
[BPF_LDX|BPF_B|BPF_MSH] = BPF_S_LDX_B_MSH,
[BPF_LDX|BPF_IMM] = BPF_S_LDX_IMM,
[BPF_MISC|BPF_TAX] = BPF_S_MISC_TAX,
[BPF_MISC|BPF_TXA] = BPF_S_MISC_TXA,
[BPF_RET|BPF_K] = BPF_S_RET_K,
[BPF_RET|BPF_A] = BPF_S_RET_A,
[BPF_ALU|BPF_DIV|BPF_K] = BPF_S_ALU_DIV_K,
[BPF_LD|BPF_MEM] = BPF_S_LD_MEM,
[BPF_LDX|BPF_MEM] = BPF_S_LDX_MEM,
[BPF_ST] = BPF_S_ST,
[BPF_STX] = BPF_S_STX,
[BPF_JMP|BPF_JA] = BPF_S_JMP_JA,
[BPF_JMP|BPF_JEQ|BPF_K] = BPF_S_JMP_JEQ_K,
[BPF_JMP|BPF_JEQ|BPF_X] = BPF_S_JMP_JEQ_X,
[BPF_JMP|BPF_JGE|BPF_K] = BPF_S_JMP_JGE_K,
[BPF_JMP|BPF_JGE|BPF_X] = BPF_S_JMP_JGE_X,
[BPF_JMP|BPF_JGT|BPF_K] = BPF_S_JMP_JGT_K,
[BPF_JMP|BPF_JGT|BPF_X] = BPF_S_JMP_JGT_X,
[BPF_JMP|BPF_JSET|BPF_K] = BPF_S_JMP_JSET_K,
[BPF_JMP|BPF_JSET|BPF_X] = BPF_S_JMP_JSET_X,
};
int pc;
@ -498,8 +498,7 @@ int sk_chk_filter(struct sock_filter *filter, int flen)
if (code >= ARRAY_SIZE(codes))
return -EINVAL;
code = codes[code];
/* Undo the '+ 1' in codes[] after validation. */
if (!code--)
if (!code)
return -EINVAL;
/* Some instructions need special checks */
switch (code) {