https://github.com/torvalds/linux
Revision 028b027524b162eef90839a92ba4b8bddf23e06c authored by Patrick McHardy on 13 April 2008, 01:35:41 UTC, committed by David S. Miller on 13 April 2008, 01:35:41 UTC
dev_queue_xmit() and the other IP output functions expect to get a skb
with clear or properly initialized skb->cb. Unlike TCP and UDP, the
dccp_skb_cb doesn't contain a struct inet_skb_parm at the beginning,
so the DCCP-specific data is interpreted by the IP output functions.
This can cause false negatives for the conditional POST_ROUTING hook
invocation, making the packet bypass the hook.

Add a inet_skb_parm/inet6_skb_parm union to the beginning of
dccp_skb_cb to avoid clashes. Also add a BUILD_BUG_ON to make
sure it fits in the cb.

[ Combined with patch from Gerrit Renker to remove two now unnecessary
  memsets of IPCB(skb)->opt ]

Signed-off-by: Patrick McHardy <kaber@trash.net>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent ae1b6a3
History
Tip revision: 028b027524b162eef90839a92ba4b8bddf23e06c authored by Patrick McHardy on 13 April 2008, 01:35:41 UTC
[DCCP]: Fix skb->cb conflicts with IP
Tip revision: 028b027
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