diff options
author | Eric Dumazet <edumazet@google.com> | 2013-07-18 10:19:26 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2013-07-18 16:05:23 -0400 |
commit | d4b812dea4a236f729526facf97df1a9d18e191c (patch) | |
tree | 55effa330847edd70cf20502603c23e4ca8084a4 /include | |
parent | ece793fcfc417b3925844be88a6a6dc82ae8f7c6 (diff) |
vlan: mask vlan prio bits
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>
Diffstat (limited to 'include')
-rw-r--r-- | include/linux/if_vlan.h | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index cdcbafa9b39a..715c343f7c00 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) | |||
79 | } | 79 | } |
80 | 80 | ||
81 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) | 81 | #define vlan_tx_tag_present(__skb) ((__skb)->vlan_tci & VLAN_TAG_PRESENT) |
82 | #define vlan_tx_nonzero_tag_present(__skb) \ | ||
83 | (vlan_tx_tag_present(__skb) && ((__skb)->vlan_tci & VLAN_VID_MASK)) | ||
84 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) | 82 | #define vlan_tx_tag_get(__skb) ((__skb)->vlan_tci & ~VLAN_TAG_PRESENT) |
83 | #define vlan_tx_tag_get_id(__skb) ((__skb)->vlan_tci & VLAN_VID_MASK) | ||
85 | 84 | ||
86 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) | 85 | #if defined(CONFIG_VLAN_8021Q) || defined(CONFIG_VLAN_8021Q_MODULE) |
87 | 86 | ||