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[NET]: net/core/filter.c: make len cover the entire packet

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As suggested by Herbert Xu:

Since we don't require anything to be in the linear packet range
anymore make len cover the entire packet.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-07-05 14:10:40 -07:00 • committed by David S. Miller
parent 0b05b2a49e
commit 3154e540e3
1 changed files with 2 additions and 6 deletions
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8
net/core/filter.c
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@ -76,10 +76,6 @@ static inline void *load_pointer(struct sk_buff *skb, int k,
int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen) int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen)
{ {
/* len is UNSIGNED. Byte wide insns relies only on implicit
type casts to prevent reading arbitrary memory locations.
*/
unsigned int len = skb->len-skb->data_len;
struct sock_filter *fentry; /* We walk down these */ struct sock_filter *fentry; /* We walk down these */
void *ptr; void *ptr;
u32 A = 0; /* Accumulator */ u32 A = 0; /* Accumulator */
@ -206,10 +202,10 @@ load_b:
} }
return 0; return 0;
case BPF_LD|BPF_W|BPF_LEN: case BPF_LD|BPF_W|BPF_LEN:
A = len; A = skb->len;
continue; continue;
case BPF_LDX|BPF_W|BPF_LEN: case BPF_LDX|BPF_W|BPF_LEN:
X = len; X = skb->len;
continue; continue;
case BPF_LD|BPF_W|BPF_IND: case BPF_LD|BPF_W|BPF_IND:
k = X + fentry->k; k = X + fentry->k;