ipv6: Partial checksum only UDP packets
ip6_append_data is used by other protocols and some of them can't
be partially checksummed. Only partially checksum UDP protocol.
Fixes: 32dce968dd987a (ipv6: Allow for partial checksums on non-ufo packets)
Reported-by: Sabrina Dubroca <sd@queasysnail.net>
Tested-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Vladislav Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index d33df4c..7deebf1 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1273,7 +1273,7 @@
/* If this is the first and only packet and device
* supports checksum offloading, let's use it.
*/
- if (!skb &&
+ if (!skb && sk->sk_protocol == IPPROTO_UDP &&
length + fragheaderlen < mtu &&
rt->dst.dev->features & NETIF_F_V6_CSUM &&
!exthdrlen)