[PATCH Precise SRO] =?UTF-8?q?veth:=20don=E2=80=99t=20modify=20ip=5Fsummed; ?= doing so treats packets with bad checksums as good.

[tim.gardner at canonical.com]

From: Vijay Pandurangan <vijayp at vijayp.ca>

BugLink: http://bugs.launchpad.net/bugs/1547207

Packets that arrive from real hardware devices have ip_summed ==
CHECKSUM_UNNECESSARY if the hardware verified the checksums, or
CHECKSUM_NONE if the packet is bad or it was unable to verify it. The
current version of veth will replace CHECKSUM_NONE with
CHECKSUM_UNNECESSARY, which causes corrupt packets routed from hardware to
a veth device to be delivered to the application. This caused applications
at Twitter to receive corrupt data when network hardware was corrupting
packets.

We believe this was added as an optimization to skip computing and
verifying checksums for communication between containers. However, locally
generated packets have ip_summed == CHECKSUM_PARTIAL, so the code as
written does nothing for them. As far as we can tell, after removing this
code, these packets are transmitted from one stack to another unmodified
(tcpdump shows invalid checksums on both sides, as expected), and they are
delivered correctly to applications. We didn’t test every possible network
configuration, but we tried a few common ones such as bridging containers,
using NAT between the host and a container, and routing from hardware
devices to containers. We have effectively deployed this in production at
Twitter (by disabling RX checksum offloading on veth devices).

This code dates back to the first version of the driver, commit
<e314dbdc1c0dc6a548ecf> ("[NET]: Virtual ethernet device driver"), so I
suspect this bug occurred mostly because the driver API has evolved
significantly since then. Commit <0b7967503dc97864f283a> ("net/veth: Fix
packet checksumming") (in December 2010) fixed this for packets that get
created locally and sent to hardware devices, by not changing
CHECKSUM_PARTIAL. However, the same issue still occurs for packets coming
in from hardware devices.

Co-authored-by: Evan Jones <ej at evanjones.ca>
Signed-off-by: Evan Jones <ej at evanjones.ca>
Cc: Nicolas Dichtel <nicolas.dichtel at 6wind.com>
Cc: Phil Sutter <phil at nwl.cc>
Cc: Toshiaki Makita <makita.toshiaki at lab.ntt.co.jp>
Cc: netdev at vger.kernel.org
Cc: linux-kernel at vger.kernel.org
Signed-off-by: Vijay Pandurangan <vijayp at vijayp.ca>
Acked-by: Cong Wang <cwang at twopensource.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit ce8c839b74e3017996fad4e1b7ba2e2625ede82f)
Signed-off-by: Tim Gardner <tim.gardner at canonical.com>
---
 drivers/net/veth.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 3634032..9de9dc3 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -117,12 +117,6 @@ static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
 		kfree_skb(skb);
 		goto drop;
 	}
-	/* don't change ip_summed == CHECKSUM_PARTIAL, as that
-	 * will cause bad checksum on forwarded packets
-	 */
-	if (skb->ip_summed == CHECKSUM_NONE &&
-	    rcv->features & NETIF_F_RXCSUM)
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
 
 	if (likely(dev_forward_skb(rcv, skb) == NET_RX_SUCCESS)) {
 		struct pcpu_vstats *stats = this_cpu_ptr(dev->vstats);
-- 
1.9.1