udpv6: Fix gso_size setting in ip6_ufo_append_data

- fix gso_size setting for ipv6 fragment to be a multiple of 8 bytes.

Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 7c76e3d..1c6f0fc 100644 (file)
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1087,9 +1087,11 @@ static inline int ip6_ufo_append_data(struct sock *sk,
        if (!err) {
                struct frag_hdr fhdr;
 
-               /* specify the length of each IP datagram fragment*/
-               skb_shinfo(skb)->gso_size = mtu - fragheaderlen -
-                                           sizeof(struct frag_hdr);
+               /* Specify the length of each IPv6 datagram fragment.
+                * It has to be a multiple of 8.
+                */
+               skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
+                                            sizeof(struct frag_hdr)) & ~7;
                skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
                ipv6_select_ident(skb, &fhdr);
                skb_shinfo(skb)->ip6_frag_id = fhdr.identification;