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authorEric Dumazet <eric.dumazet@gmail.com>2011-12-03 22:39:53 +0100
committerDavid S. Miller <davem@davemloft.net>2011-12-04 19:20:39 +0100
commit117632e64d2a5f464e491fe221d7169a3814a77b (patch)
tree88f3a036305da54a62835d900553dda9bc846a8f /net/ipv4/fib_frontend.c
parentsfc: Use kcalloc instead of kzalloc to allocate array (diff)
downloadlinux-117632e64d2a5f464e491fe221d7169a3814a77b.tar.xz
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tcp: take care of misalignments
We discovered that TCP stack could retransmit misaligned skbs if a malicious peer acknowledged sub MSS frame. This currently can happen only if output interface is non SG enabled : If SG is enabled, tcp builds headless skbs (all payload is included in fragments), so the tcp trimming process only removes parts of skb fragments, header stay aligned. Some arches cant handle misalignments, so force a head reallocation and shrink headroom to MAX_TCP_HEADER. Dont care about misaligments on x86 and PPC (or other arches setting NET_IP_ALIGN to 0) This patch introduces __pskb_copy() which can specify the headroom of new head, and pskb_copy() becomes a wrapper on top of __pskb_copy() Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/fib_frontend.c')
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