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ARM: net: fix vlan access instructions in ARM JIT.

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This makes BPF_ANC | SKF_AD_VLAN_TAG and BPF_ANC | SKF_AD_VLAN_TAG_PRESENT
have the same behaviour as the in kernel VM and makes the test_bpf LD_VLAN_TAG
and LD_VLAN_TAG_PRESENT tests pass.

Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Schichan 2015-07-21 14:14:14 +02:00 committed by David S. Miller
parent 6d715e301e
commit c18fe54b3f
1 changed files with 5 additions and 3 deletions
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8
arch/arm/net/bpf_jit_32.c
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@ -889,9 +889,11 @@ b_epilogue:
off = offsetof(struct sk_buff, vlan_tci);
emit(ARM_LDRH_I(r_A, r_skb, off), ctx);
if (code == (BPF_ANC | SKF_AD_VLAN_TAG))
OP_IMM3(ARM_AND, r_A, r_A, VLAN_VID_MASK, ctx);
else
OP_IMM3(ARM_AND, r_A, r_A, VLAN_TAG_PRESENT, ctx);
OP_IMM3(ARM_AND, r_A, r_A, ~VLAN_TAG_PRESENT, ctx);
else {
OP_IMM3(ARM_LSR, r_A, r_A, 12, ctx);
OP_IMM3(ARM_AND, r_A, r_A, 0x1, ctx);
}
break;
case BPF_ANC | SKF_AD_QUEUE:
ctx->seen |= SEEN_SKB;