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ARM: net: bpf_jit_32: add VLAN instructions for BPF JIT 

This patch is a follow-up for patch "net: filter: add vlan tag access"
to support the new VLAN_TAG/VLAN_TAG_PRESENT accessors in BPF JIT.

Signed-off-by: Daniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Cc: Mircea Gherzan <mgherzan@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: Mircea Gherzan <mgherzan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2012-11-07 15:31:02 +00:00 committed by David S. Miller
parent 3cbe20412e
commit bf0098f22c
1 changed files with 14 additions and 0 deletions
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14
arch/arm/net/bpf_jit_32.c
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@ -16,6 +16,7 @@
#include <linux/netdevice.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/if_vlan.h>
#include <asm/cacheflush.h>
#include <asm/hwcap.h>
@ -168,6 +169,8 @@ static inline bool is_load_to_a(u16 inst)
case BPF_S_ANC_MARK:
case BPF_S_ANC_PROTOCOL:
case BPF_S_ANC_RXHASH:
case BPF_S_ANC_VLAN_TAG:
case BPF_S_ANC_VLAN_TAG_PRESENT:
case BPF_S_ANC_QUEUE:
return true;
default:
@ -815,6 +818,17 @@ b_epilogue:
off = offsetof(struct sk_buff, rxhash);
emit(ARM_LDR_I(r_A, r_skb, off), ctx);
break;
case BPF_S_ANC_VLAN_TAG:
case BPF_S_ANC_VLAN_TAG_PRESENT:
ctx->seen |= SEEN_SKB;
BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
off = offsetof(struct sk_buff, vlan_tci);
emit(ARM_LDRH_I(r_A, r_skb, off), ctx);
if (inst->code == BPF_S_ANC_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);
break;
case BPF_S_ANC_QUEUE:
ctx->seen |= SEEN_SKB;
BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,