vlan: mask vlan prio bits

[ Upstream commit d4b812dea4a236f729526facf97df1a9d18e191c ]

In commit 48cc32d38a52d0b68f91a171a8d00531edc6a46e
("vlan: don't deliver frames for unknown vlans to protocols")
Florian made sure we set pkt_type to PACKET_OTHERHOST
if the vlan id is set and we could find a vlan device for this
particular id.

But we also have a problem if prio bits are set.

Steinar reported an issue on a router receiving IPv6 frames with a
vlan tag of 4000 (id 0, prio 2), and tunneled into a sit device,
because skb->vlan_tci is set.

Forwarded frame is completely corrupted : We can see (8100:4000)
being inserted in the middle of IPv6 source address :

16:48:00.780413 IP6 2001:16d8:8100:4000:ee1c:0:9d9:bc87 >
9f94:4d95:2001:67c:29f4::: ICMP6, unknown icmp6 type (0), length 64
       0x0000:  0000 0029 8000 c7c3 7103 0001 a0ae e651
       0x0010:  0000 0000 ccce 0b00 0000 0000 1011 1213
       0x0020:  1415 1617 1819 1a1b 1c1d 1e1f 2021 2223
       0x0030:  2425 2627 2829 2a2b 2c2d 2e2f 3031 3233

It seems we are not really ready to properly cope with this right now.

We can probably do better in future kernels :
vlan_get_ingress_priority() should be a netdev property instead of
a per vlan_dev one.

For stable kernels, lets clear vlan_tci to fix the bugs.

Reported-by: Steinar H. Gunderson <sesse@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

3 files changed, 11 insertions, 5 deletions

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 637fa71de0c7..0b3498800ba0 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -79,9 +79,8 @@ static inline int is_vlan_dev(struct net_device *dev)
 }
 
 #define vlan_tx_tag_present(__skb)      ((__skb)->vlan_tci & VLAN_TAG_PRESENT)
-#define vlan_tx_nonzero_tag_present(__skb) \
-        (vlan_tx_tag_present(__skb) && ((__skb)->vlan_tci & VLAN_VID_MASK))
 #define vlan_tx_tag_get(__skb)          ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT)
+#define vlan_tx_tag_get_id(__skb)       ((__skb)->vlan_tci & VLAN_VID_MASK)
 
 #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE)
 
diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c
index 8a15eaadc4bd..4a78c4de9f20 100644
--- a/net/8021q/vlan_core.c
+++ b/net/8021q/vlan_core.c
@@ -9,7 +9,7 @@ bool vlan_do_receive(struct sk_buff **skbp)
 {
         struct sk_buff *skb = *skbp;
         __be16 vlan_proto = skb->vlan_proto;
-        u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK;
+        u16 vlan_id = vlan_tx_tag_get_id(skb);
         struct net_device *vlan_dev;
         struct vlan_pcpu_stats *rx_stats;
 
diff --git a/net/core/dev.c b/net/core/dev.c
index faebb398fb46..7ddbb31b10d3 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3513,8 +3513,15 @@ ncls:
                 }
         }
 
-        if (vlan_tx_nonzero_tag_present(skb))
-                skb->pkt_type = PACKET_OTHERHOST;
+        if (unlikely(vlan_tx_tag_present(skb))) {
+                if (vlan_tx_tag_get_id(skb))
+                        skb->pkt_type = PACKET_OTHERHOST;
+                /* Note: we might in the future use prio bits
+                 * and set skb->priority like in vlan_do_receive()
+                 * For the time being, just ignore Priority Code Point
+                 */
+                skb->vlan_tci = 0;
+        }
 
         /* deliver only exact match when indicated */
         null_or_dev = deliver_exact ? skb->dev : NULL;