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[NETFILTER]: nfnetlink_queue: fix computation of allocated size for netlink skb. 

Size of the netlink skb was wrongly computed because the formula was using
NLMSG_ALIGN instead of NLMSG_SPACE. NLMSG_ALIGN does not add the room for
netlink header as NLMSG_SPACE does. This was causing a failure of message
building in some cases.

On my test system, all messages for packets in range [8*k+41, 8*k+48] where k
is an integer were invalid and the corresponding packets were dropped.

Signed-off-by: Eric Leblond <eric@inl.fr>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Leblond 2008-03-10 16:41:43 -07:00 committed by David S. Miller
parent b5e85dee2a
commit cabaa9bfb0
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nfnetlink_queue.c
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@ -224,7 +224,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue,
struct net_device *indev;
struct net_device *outdev;
size = NLMSG_ALIGN(sizeof(struct nfgenmsg))
size = NLMSG_SPACE(sizeof(struct nfgenmsg))
+ nla_total_size(sizeof(struct nfqnl_msg_packet_hdr))
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */