[IPV6]: Disable SG for GSO unless we have checksum

Because the system won't turn off the SG flag for us we
need to do this manually on the IPv6 path.  Otherwise we
will throw IPv6 packets with bad checksums at the hardware.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 4f3bb7fcc8b509ac71615e7a8c0f543d95349854..de6b91981b30611b0cd63ea8d14a304b34387c27 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -123,6 +123,9 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, int features)
        struct ipv6hdr *ipv6h;
        struct inet6_protocol *ops;
 
+       if (!(features & NETIF_F_HW_CSUM))
+               features &= ~NETIF_F_SG;
+
        if (unlikely(skb_shinfo(skb)->gso_type &
                     ~(SKB_GSO_UDP |
                       SKB_GSO_DODGY |