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authorEric Dumazet <eric.dumazet@gmail.com>2009-10-26 18:40:35 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-27 01:02:33 -0700
commit05423b241311c9380b7280179295bac7794281b6 (patch)
tree8a84aca48cbc30b142bdf143dbf11fdbab9cad67 /include/net/inet_timewait_sock.h
parentcan: sja1000: fix bug using library functions for skb allocation (diff)
downloadlinux-dev-05423b241311c9380b7280179295bac7794281b6.tar.xz
linux-dev-05423b241311c9380b7280179295bac7794281b6.zip
vlan: allow null VLAN ID to be used
We currently use a 16 bit field (vlan_tci) to store VLAN ID/PRIO on a skb. Null value is used as a special value, meaning vlan tagging not enabled. This forbids use of null vlan ID. As pointed by David, some drivers use the 3 high order bits (PRIO) As VLAN ID is 12 bits, we can use the remaining bit (CFI) as a flag, and allow null VLAN ID. In case future code really wants to use VLAN_CFI_MASK, we'll have to use a bit outside of vlan_tci. #define VLAN_PRIO_MASK 0xe000 /* Priority Code Point */ #define VLAN_PRIO_SHIFT 13 #define VLAN_CFI_MASK 0x1000 /* Canonical Format Indicator */ #define VLAN_TAG_PRESENT VLAN_CFI_MASK #define VLAN_VID_MASK 0x0fff /* VLAN Identifier */ Reported-by: Gertjan Hofman <gertjan_hofman@yahoo.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/inet_timewait_sock.h')
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