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-rw-r--r--arch/x86/net/bpf_jit_comp.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
index 520d2bd..d11a470 100644
--- a/arch/x86/net/bpf_jit_comp.c
+++ b/arch/x86/net/bpf_jit_comp.c
@@ -11,6 +11,7 @@
#include <asm/cacheflush.h>
#include <linux/netdevice.h>
#include <linux/filter.h>
+#include <linux/if_vlan.h>
/*
* Conventions :
@@ -212,6 +213,8 @@ void bpf_jit_compile(struct sk_filter *fp)
case BPF_S_ANC_MARK:
case BPF_S_ANC_RXHASH:
case BPF_S_ANC_CPU:
+ case BPF_S_ANC_VLAN_TAG:
+ case BPF_S_ANC_VLAN_TAG_PRESENT:
case BPF_S_ANC_QUEUE:
case BPF_S_LD_W_ABS:
case BPF_S_LD_H_ABS:
@@ -515,6 +518,24 @@ void bpf_jit_compile(struct sk_filter *fp)
CLEAR_A();
#endif
break;
+ case BPF_S_ANC_VLAN_TAG:
+ case BPF_S_ANC_VLAN_TAG_PRESENT:
+ BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff, vlan_tci) != 2);
+ if (is_imm8(offsetof(struct sk_buff, vlan_tci))) {
+ /* movzwl off8(%rdi),%eax */
+ EMIT4(0x0f, 0xb7, 0x47, offsetof(struct sk_buff, vlan_tci));
+ } else {
+ EMIT3(0x0f, 0xb7, 0x87); /* movzwl off32(%rdi),%eax */
+ EMIT(offsetof(struct sk_buff, vlan_tci), 4);
+ }
+ BUILD_BUG_ON(VLAN_TAG_PRESENT != 0x1000);
+ if (filter[i].code == BPF_S_ANC_VLAN_TAG) {
+ EMIT3(0x80, 0xe4, 0xef); /* and $0xef,%ah */
+ } else {
+ EMIT3(0xc1, 0xe8, 0x0c); /* shr $0xc,%eax */
+ EMIT3(0x83, 0xe0, 0x01); /* and $0x1,%eax */
+ }
+ break;
case BPF_S_LD_W_ABS:
func = CHOOSE_LOAD_FUNC(K, sk_load_word);
common_load: seen |= SEEN_DATAREF;
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