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tipc: Ensure outgoing messages on Ethernet have sufficient headroom

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Add code to expand the headroom of an outgoing TIPC message if the
sk_buff has insufficient room to hold the header for the associated
Ethernet device.  This change is necessary to ensure that messages
TIPC does not create itself (eg. incoming messages that are being
routed to another node) do not cause problems, since TIPC has no
control over the amount of headroom available in such messages.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Allan Stephens 2010-09-03 08:33:40 +00:00 committed by David S. Miller
parent 5d9c54c1e9
commit 9fbfca0131
1 changed files with 17 additions and 8 deletions
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25
net/tipc/eth_media.c
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@ -72,17 +72,26 @@ static int send_msg(struct sk_buff *buf, struct tipc_bearer *tb_ptr,
{
struct sk_buff *clone;
struct net_device *dev;
int delta;
clone = skb_clone(buf, GFP_ATOMIC);
if (clone) {
skb_reset_network_header(clone);
dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
clone->dev = dev;
dev_hard_header(clone, dev, ETH_P_TIPC,
&dest->dev_addr.eth_addr,
dev->dev_addr, clone->len);
dev_queue_xmit(clone);
if (!clone)
return 0;
dev = ((struct eth_bearer *)(tb_ptr->usr_handle))->dev;
delta = dev->hard_header_len - skb_headroom(buf);
if ((delta > 0) &&
pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
kfree_skb(clone);
return 0;
}
skb_reset_network_header(clone);
clone->dev = dev;
dev_hard_header(clone, dev, ETH_P_TIPC, &dest->dev_addr.eth_addr,
dev->dev_addr, clone->len);
dev_queue_xmit(clone);
return 0;
}