linux-kernel - [PATCH 3.2 01/94] Revert "net: ipv4: ip_forward: fix inverted local

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Date:	Mon, 04 Aug 2014 17:48:31 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org
Subject: [PATCH 3.2 01/94] Revert "net: ipv4: ip_forward: fix inverted
 local_df  test"

3.2.62-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Ben Hutchings <ben@...adent.org.uk>

This reverts commit 59d9f389df3cdf72833d5ee17c3fe959b6bdc792, which
was commit ca6c5d4ad216d5942ae544bbf02503041bd802aa upstream.  It is a
valid fix, but depends on sk_buff::local_df being set in all the right
cases, which it wasn't in 3.2.  We need to defer it unless and until
the other fixes are also backported to 3.2.y.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ipv4/ip_forward.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -42,12 +42,12 @@
 static bool ip_may_fragment(const struct sk_buff *skb)
 {
 	return unlikely((ip_hdr(skb)->frag_off & htons(IP_DF)) == 0) ||
-		skb->local_df;
+	       !skb->local_df;
 }
 
 static bool ip_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
 {
-	if (skb->len <= mtu)
+	if (skb->len <= mtu || skb->local_df)
 		return false;
 
 	if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)

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