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6lowpan: Use skb_cow in IPHC decompression.

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Currently there are potentially 2 skb_copy_expand calls in IPHC
decompression.  This patch replaces this with one call to
skb_cow which will check to see if there is enough headroom
first to ensure it's only done if necessary and will handle
alignment issues for cache.
As skb_cow uses pskb_expand_head we ensure the skb isn't shared from
bluetooth and ieee802.15.4 code that use the IPHC decompression.

Signed-off-by: Martin Townsend <martin.townsend@xsilon.com>
Acked-by: Alexander Aring <alex.aring@gmail.com>
Acked-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Martin Townsend
2014-10-13 11:00:56 +01:00
committed by Marcel Holtmann
parent 4456c50d23
commit 11e3ff7072
2 changed files with 25 additions and 26 deletions
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4
net/bluetooth/6lowpan.c
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@@ -309,6 +309,10 @@ static int recv_pkt(struct sk_buff *skb, struct net_device *dev,
if (dev->type != ARPHRD_6LOWPAN)
goto drop;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
goto drop;
/* check that it's our buffer */
if (skb->data[0] == LOWPAN_DISPATCH_IPV6) {
/* Copy the packet so that the IPv6 header is