Commit bf0098f2 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

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: default avatarDaniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Cc: Mircea Gherzan <mgherzan@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Acked-by: default avatarMircea Gherzan <mgherzan@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3cbe2041
......@@ -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 @@ static int build_body(struct jit_ctx *ctx)
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,
......
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