From: Daniel Borkmann <dxchgb@gmail.com>
Date: Thu, 8 Nov 2012 11:41:39 +0000 (+0000)
Subject: PPC: net: bpf_jit_comp: add VLAN instructions for BPF JIT
X-Git-Tag: v3.8-rc1~139^2~298
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5082dfb71600b4d227c3f0af630c0cd3158e1feb;p=people%2Fms%2Flinux.git

PPC: net: bpf_jit_comp: 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: Matt Evans <matt@ozlabs.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c
index b9434de8222b..e834f1ec23c8 100644
--- a/arch/powerpc/net/bpf_jit_comp.c
+++ b/arch/powerpc/net/bpf_jit_comp.c
@@ -13,6 +13,8 @@
 #include <asm/cacheflush.h>
 #include <linux/netdevice.h>
 #include <linux/filter.h>
+#include <linux/if_vlan.h>
+
 #include "bpf_jit.h"
 
 #ifndef __BIG_ENDIAN
@@ -89,6 +91,8 @@ static void bpf_jit_build_prologue(struct sk_filter *fp, u32 *image,
 	case BPF_S_ANC_IFINDEX:
 	case BPF_S_ANC_MARK:
 	case BPF_S_ANC_RXHASH:
+	case BPF_S_ANC_VLAN_TAG:
+	case BPF_S_ANC_VLAN_TAG_PRESENT:
 	case BPF_S_ANC_CPU:
 	case BPF_S_ANC_QUEUE:
 	case BPF_S_LD_W_ABS:
@@ -382,6 +386,16 @@ static int bpf_jit_build_body(struct sk_filter *fp, u32 *image,
 			PPC_LWZ_OFFS(r_A, r_skb, offsetof(struct sk_buff,
 							  rxhash));
 			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);
+			PPC_LHZ_OFFS(r_A, r_skb, offsetof(struct sk_buff,
+							  vlan_tci));
+			if (filter[i].code == BPF_S_ANC_VLAN_TAG)
+				PPC_ANDI(r_A, r_A, VLAN_VID_MASK);
+			else
+				PPC_ANDI(r_A, r_A, VLAN_TAG_PRESENT);
+			break;
 		case BPF_S_ANC_QUEUE:
 			BUILD_BUG_ON(FIELD_SIZEOF(struct sk_buff,
 						  queue_mapping) != 2);