ipv4: Fix ip-header identification for gso packets.

ip-header id needs to be incremented even if IP_DF flag is set.
This behaviour was changed in commit 490ab08127cebc25e3a26
(IP_GRE: Fix IP-Identification).

Following patch fixes it so that identification is always
incremented.

Reported-by: Cong Wang <amwang@redhat.com>
Acked-by: Cong Wang <amwang@redhat.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

diff --git a/include/net/ipip.h b/include/net/ipip.h
index 0c046e3..483b91a 100644 (file)
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -74,15 +74,11 @@ static inline void tunnel_ip_select_ident(struct sk_buff *skb,
 {
        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);
-       }
+       /* 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

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 9e5882c..70b2d4c 100644 (file)
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1334,8 +1334,7 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb,
                                iph->frag_off |= htons(IP_MF);
                        offset += (skb->len - skb->mac_len - iph->ihl * 4);
                } else  {
-                       if (!(iph->frag_off & htons(IP_DF)))
-                               iph->id = htons(id++);
+                       iph->id = htons(id++);
                }
                iph->tot_len = htons(skb->len - skb->mac_len);
                iph->check = 0;