filter: add XOR operation
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>
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 92dd993..7209099 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -126,7 +126,8 @@
#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 @@
BPF_S_ANC_HATYPE,
BPF_S_ANC_RXHASH,
BPF_S_ANC_CPU,
+ BPF_S_ANC_ALU_XOR_X,
};
#endif /* __KERNEL__ */
diff --git a/net/core/filter.c b/net/core/filter.c
index cfbea88..5099c4b 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -315,6 +315,9 @@
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 @@
ANCILLARY(HATYPE);
ANCILLARY(RXHASH);
ANCILLARY(CPU);
+ ANCILLARY(ALU_XOR_X);
}
}
ftest->code = code;