From b40c5f4fde22fb98eff205b3aece05b471c24eed Mon Sep 17 00:00:00 2001 From: Ansis Atteka Date: Fri, 21 Apr 2017 15:23:05 -0700 Subject: [PATCH] udp: disable inner UDP checksum offloads in IPsec case Otherwise, UDP checksum offloads could corrupt ESP packets by attempting to calculate UDP checksum when this inner UDP packet is already protected by IPsec. One way to reproduce this bug is to have a VM with virtio_net driver (UFO set to ON in the guest VM); and then encapsulate all guest's Ethernet frames in Geneve; and then further encrypt Geneve with IPsec. In this case following symptoms are observed: 1. If using ixgbe NIC, then it will complain with following error message: ixgbe 0000:01:00.1: partial checksum but l4 proto=32! 2. Receiving IPsec stack will drop all the corrupted ESP packets and increase XfrmInStateProtoError counter in /proc/net/xfrm_stat. 3. iperf UDP test from the VM with packet sizes above MTU will not work at all. 4. iperf TCP test from the VM will get ridiculously low performance because. Signed-off-by: Ansis Atteka Co-authored-by: Steffen Klassert Signed-off-by: David S. Miller --- net/ipv4/udp_offload.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index b2be1d9757ef..781250151d40 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -29,6 +29,7 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, u16 mac_len = skb->mac_len; int udp_offset, outer_hlen; __wsum partial; + bool need_ipsec; if (unlikely(!pskb_may_pull(skb, tnl_hlen))) goto out; @@ -62,8 +63,10 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb, ufo = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP); + need_ipsec = skb_dst(skb) && dst_xfrm(skb_dst(skb)); /* Try to offload checksum if possible */ offload_csum = !!(need_csum && + !need_ipsec && (skb->dev->features & (is_ipv6 ? (NETIF_F_HW_CSUM | NETIF_F_IPV6_CSUM) : (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM))));