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authorAllan Stephens <allan.stephens@windriver.com>2010-09-03 08:33:40 +0000
committerDavid S. Miller <davem@davemloft.net>2010-09-06 18:12:56 -0700
commit9fbfca013176f9b90d186f3b446fd93e4d972b25 (patch)
tree8af12e9242f8156bb8636b59896a63094bd65525 /net/tipc
parent5d9c54c1e9ececcf7e99c4f014f9bec7ee3a7def (diff)
tipc: Ensure outgoing messages on Ethernet have sufficient headroom
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>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/eth_media.c25
1 files changed, 17 insertions, 8 deletions
diff --git a/net/tipc/eth_media.c b/net/tipc/eth_media.c
index 6230d16020c4..81253d0b24b9 100644
--- a/net/tipc/eth_media.c
+++ b/net/tipc/eth_media.c
@@ -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;
}