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-rw-r--r--main/linux-pae/0003-ip_gre-include-route-header_len-in-max_headroom-calc.patch39
1 files changed, 39 insertions, 0 deletions
diff --git a/main/linux-pae/0003-ip_gre-include-route-header_len-in-max_headroom-calc.patch b/main/linux-pae/0003-ip_gre-include-route-header_len-in-max_headroom-calc.patch
new file mode 100644
index 00000000..61d7c9a6
--- /dev/null
+++ b/main/linux-pae/0003-ip_gre-include-route-header_len-in-max_headroom-calc.patch
@@ -0,0 +1,39 @@
+From cd0e9d08480e1e0648e17d099ecf50f6fd8714e5 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
+Date: Sat, 20 Mar 2010 02:27:58 +0000
+Subject: [PATCH 03/18] ip_gre: include route header_len in max_headroom calculation
+
+Taking route's header_len into account, and updating gre device
+needed_headroom will give better hints on upper bound of required
+headroom. This is useful if the gre traffic is xfrm'ed.
+
+Signed-off-by: Timo Teras <timo.teras@iki.fi>
+Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+(cherry picked from commit 243aad830e8a4cdda261626fbaeddde16b08d04a)
+---
+ net/ipv4/ip_gre.c | 4 +++-
+ 1 files changed, 3 insertions(+), 1 deletions(-)
+
+diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
+index ac88ce5..7f1ff73 100644
+--- a/net/ipv4/ip_gre.c
++++ b/net/ipv4/ip_gre.c
+@@ -803,11 +803,13 @@ static netdev_tx_t ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev
+ tunnel->err_count = 0;
+ }
+
+- max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen;
++ max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen + rt->u.dst.header_len;
+
+ if (skb_headroom(skb) < max_headroom || skb_shared(skb)||
+ (skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
+ struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom);
++ if (max_headroom > dev->needed_headroom)
++ dev->needed_headroom = max_headroom;
+ if (!new_skb) {
+ ip_rt_put(rt);
+ stats->tx_dropped++;
+--
+1.7.0.2
+