On Thu, Mar 17, 2016 at 11:24:59AM +0100, Steffen Klassert wrote:
> In IPv6 this check is missing, so this could be the
> problem if this is IPv6.

indeed, this patch also fixes my problem:

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1353,6 +1353,7 @@ emsgsize:
             (skb && skb_is_gso(skb))) &&
            (sk->sk_protocol == IPPROTO_UDP) &&
            (rt->dst.dev->features & NETIF_F_UFO) &&
+           !rt->dst.header_len &&
            (sk->sk_type == SOCK_DGRAM)) {
                err = ip6_ufo_append_data(sk, queue, getfrag, from, length,
                                          hh_len, fragheaderlen,

I can't say which is better. Herbert originally seemed to like
the fix inside xfrm_output().

The IPv4 part is fixed by commit
c146066ab80267c3305de5dda6a4083f06df9265 (ipv4: Don't use ufo
handling on later transformed packets)

Thanks,

-- 
Jiri Bohac <jbo...@suse.cz>
SUSE Labs, SUSE CZ

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