Commit ffe06c17 authored by Jiri Pirko's avatar Jiri Pirko Committed by David S. Miller
Browse files

filter: add XOR operation 



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

Signed-off-by: default avatarJiri Pirko <jpirko@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 302d6637

include/linux/filter.h

+3 −1
Original line number Diff line number Diff line
@@ -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__ */

net/core/filter.c

+4 −0
Original line number Diff line number Diff line
@@ -315,6 +315,9 @@ unsigned int sk_run_filter(const struct sk_buff *skb, 
		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;