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authorPravin B Shelar <pshelar@nicira.com>2013-02-22 11:30:30 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-26 00:47:41 +0400
commit490ab08127cebc25e3a260a74556b56ce5f47c0f (patch)
tree61a662927a56a72ae7d567728edae1ce2bc9c8c5 /include/net
parent2bedc2e65bf58676afc4b380617327e018a97270 (diff)
downloadlinux-490ab08127cebc25e3a260a74556b56ce5f47c0f.tar.xz
IP_GRE: Fix IP-Identification.
GRE-GSO generates ip fragments with id 0,2,3,4... for every GSO packet, which is not correct. Following patch fixes it by setting ip-header id unique id of fragments are allowed. As Eric Dumazet suggested it is optimized by using inner ip-header whenever inner packet is ipv4. Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/ipip.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/net/ipip.h b/include/net/ipip.h
index 21947cf4fa46..fd19625ff99d 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -71,4 +71,21 @@ static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
}
}
+static inline void tunnel_ip_select_ident(struct sk_buff *skb,
+ const struct iphdr *old_iph,
+ struct dst_entry *dst)
+{
+ struct iphdr *iph = ip_hdr(skb);
+
+ if (iph->frag_off & htons(IP_DF))
+ iph->id = 0;
+ else {
+ /* Use inner packet iph-id if possible. */
+ if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
+ iph->id = old_iph->id;
+ else
+ __ip_select_ident(iph, dst,
+ (skb_shinfo(skb)->gso_segs ?: 1) - 1);
+ }
+}
#endif