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authorMarkos Chandras <markos.chandras@imgtec.com>2014-06-23 13:38:53 +0400
committerRalf Baechle <ralf@linux-mips.org>2014-06-26 13:48:21 +0400
commit91a41d7f972b1d78b4bcbb61ada4a33c9d7ba8a3 (patch)
tree4754b9ac95168ec1b2bea02c15ee04345eaf67ee /arch
parent6e86c59d4d0d04e7ebefd05b8af245c968892f81 (diff)
downloadlinux-91a41d7f972b1d78b4bcbb61ada4a33c9d7ba8a3.tar.xz
MIPS: bpf: Fix return values for VLAN_TAG_PRESENT case
If VLAN_TAG_PRESENT is not zero, then return 1 as expected by classic BPF. Otherwise return 0. Signed-off-by: Markos Chandras <markos.chandras@imgtec.com> Cc: David S. Miller <davem@davemloft.net> Cc: Daniel Borkmann <dborkman@redhat.com> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: netdev@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7128/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/net/bpf_jit.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/arch/mips/net/bpf_jit.c b/arch/mips/net/bpf_jit.c
index a4d1b76e7373..d852bb6d3fe3 100644
--- a/arch/mips/net/bpf_jit.c
+++ b/arch/mips/net/bpf_jit.c
@@ -1316,10 +1316,13 @@ jmp_cmp:
vlan_tci) != 2);
off = offsetof(struct sk_buff, vlan_tci);
emit_half_load(r_s0, r_skb, off, ctx);
- if (code == (BPF_ANC | SKF_AD_VLAN_TAG))
+ if (code == (BPF_ANC | SKF_AD_VLAN_TAG)) {
emit_andi(r_A, r_s0, (u16)~VLAN_TAG_PRESENT, ctx);
- else
+ } else {
emit_andi(r_A, r_s0, VLAN_TAG_PRESENT, ctx);
+ /* return 1 if present */
+ emit_sltu(r_A, r_zero, r_A, ctx);
+ }
break;
case BPF_ANC | SKF_AD_PKTTYPE:
ctx->flags |= SEEN_SKB;