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filter: add XOR operation

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Add XOR instruction fo BPF machine. Needed for computing packet hashes.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2012-03-31 11:01:20 +00:00 • committed by David S. Miller
commit ffe06c17af
2 changed files with 7 additions and 1 deletions
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4
include/linux/filter.h
View file

@ -126,7 +126,8 @@ struct sock_fprog { /* Required for SO_ATTACH_FILTER. */
#define SKF_AD_HATYPE 28
#define SKF_AD_RXHASH 32
#define SKF_AD_CPU 36
#define SKF_AD_MAX 40
#define SKF_AD_ALU_XOR_X 40
#define SKF_AD_MAX 44
#define SKF_NET_OFF (-0x100000)
#define SKF_LL_OFF (-0x200000)
@ -231,6 +232,7 @@ enum {
BPF_S_ANC_HATYPE,
BPF_S_ANC_RXHASH,
BPF_S_ANC_CPU,
BPF_S_ANC_ALU_XOR_X,
};
#endif /* __KERNEL__ */

4
net/core/filter.c
View file

@ -315,6 +315,9 @@ load_b:
case BPF_S_ANC_CPU:
A = raw_smp_processor_id();
continue;
case BPF_S_ANC_ALU_XOR_X:
A ^= X;
continue;
case BPF_S_ANC_NLATTR: {
struct nlattr *nla;
@ -559,6 +562,7 @@ int sk_chk_filter(struct sock_filter *filter, unsigned int flen)
ANCILLARY(HATYPE);
ANCILLARY(RXHASH);
ANCILLARY(CPU);
ANCILLARY(ALU_XOR_X);
}
}
ftest->code = code;