diff options
| author | Nicolas Schichan <nschichan@freebox.fr> | 2015-07-21 12:14:14 (GMT) |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-07-22 05:19:55 (GMT) |
| commit | c18fe54b3f8d7daa6a43270f82676d6a563582a4 (patch) | |
| tree | 749c52e250fc26bd2533daf555c52ff04bb1554f | |
| parent | 6d715e301e950e3314d590bdbabf0c26e4fed94b (diff) | |
| download | linux-c18fe54b3f8d7daa6a43270f82676d6a563582a4.tar.xz | |
ARM: net: fix vlan access instructions in ARM JIT.
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>
| -rw-r--r-- | arch/arm/net/bpf_jit_32.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c index d9b2524..c011e22 100644 --- a/arch/arm/net/bpf_jit_32.c +++ b/arch/arm/net/bpf_jit_32.c @@ -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; |