ip6_output: fragment outgoing reassembled skb properly

If reassembled packet would fit into outdev MTU, it is not fragmented
according the original frag size and it is send as single big packet.

The second case is if skb is gso. In that case fragmentation does not happen
according to the original frag size.

This patch fixes these.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 91fb4e8..5e31a90 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -125,7 +125,8 @@ static int ip6_finish_output2(struct sk_buff *skb)
 static int ip6_finish_output(struct sk_buff *skb)
 {
        if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
-           dst_allfrag(skb_dst(skb)))
+           dst_allfrag(skb_dst(skb)) ||
+           (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))
                return ip6_fragment(skb, ip6_finish_output2);
        else
                return ip6_finish_output2(skb);