Commit d4b812de authored Jul 18, 2013 by Eric Dumazet Committed by David S. Miller Jul 18, 2013

vlan: mask vlan prio bits



In commit 48cc32d3
("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>

parent ece793fc

include/linux/if_vlan.h

+1 −2

Original line number	Diff line number	Diff line
		@@ -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)

net/8021q/vlan_core.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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;

net/core/dev.c

+9 −2

Original line number	Diff line number	Diff line
		@@ -3580,8 +3580,15 @@ ncls:
		}
		}

		if (vlan_tx_nonzero_tag_present(skb))
		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;

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