[PATCH net-next 2/2] ARM: net: bpf_jit_32: add VLAN instructions for BPF JIT
Mircea Gherzan
mgherzan at gmail.com
Tue Nov 13 18:00:36 EST 2012
Am 08.11.2012 02:31, schrieb Daniel Borkmann:
> 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 at tik.ee.ethz.ch>
> Cc: Mircea Gherzan <mgherzan at gmail.com>
> Cc: Arnd Bergmann <arnd at arndb.de>
> ---
> arch/arm/net/bpf_jit_32.c | 14 ++++++++++++++
> 1 files changed, 14 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/net/bpf_jit_32.c b/arch/arm/net/bpf_jit_32.c
> index 8be702d..9af9a69 100644
> --- a/arch/arm/net/bpf_jit_32.c
> +++ b/arch/arm/net/bpf_jit_32.c
> @@ -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,
Acked-by: Mircea Gherzan <mgherzan at gmail.com>
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