linux-kernel - [008/101] ipv6: Add GSO support on forwarding path

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Date:	Wed, 02 Nov 2011 15:25:52 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Apollon Oikonomopoulos <apoikos@...il.com>,
	Faidon Liambotis <paravoid@...ian.org>
Subject: [008/101] ipv6: Add GSO support on forwarding path

2.6.33-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Herbert Xu <herbert@...dor.apana.org.au>

commit 0aa68271510ae2b221d4b60892103837be63afe4 upstream.

Currently we disallow GSO packets on the IPv6 forward path.
This patch fixes this.

Note that I discovered that our existing GSO MTU checks (e.g.,
IPv4 forwarding) are buggy in that they skip the check altogether,
when they really should be checking gso_size + header instead.

I have also been lazy here in that I haven't bothered to segment
the GSO packet by hand before generating an ICMP message.  Someone
should add that to be 100% correct.

Reported-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Apollon Oikonomopoulos <apoikos@...il.com>
Signed-off-by: Faidon Liambotis <paravoid@...ian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/ipv6/ip6_output.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -509,7 +509,7 @@ int ip6_forward(struct sk_buff *skb)
 		}
 	}

-	if (skb->len > dst_mtu(dst)) {
+	if (skb->len > dst_mtu(dst) && !skb_is_gso(skb)) {
 		/* Again, force OUTPUT device used as source address */
 		skb->dev = dst->dev;
 		icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev);

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