Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965006AbbLRThO (ORCPT ); Fri, 18 Dec 2015 14:37:14 -0500 Received: from mail-ig0-f179.google.com ([209.85.213.179]:38589 "EHLO mail-ig0-f179.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932584AbbLRThL (ORCPT ); Fri, 18 Dec 2015 14:37:11 -0500 From: Vijay Pandurangan To: Cong Wang Cc: Vijay Pandurangan , Evan Jones , Nicolas Dichtel , Phil Sutter , Toshiaki Makita , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] =?UTF-8?q?veth:=20don=E2=80=99t=20modify=20ip=5Fsummed;?= =?UTF-8?q?=20doing=20so=20treats=20packets=20with=20bad=20checksums=20as?= =?UTF-8?q?=20good.?= Date: Fri, 18 Dec 2015 14:34:59 -0500 Message-Id: <1450467299-7188-1-git-send-email-vijayp@vijayp.ca> X-Mailer: git-send-email 2.5.0 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3068 Lines: 67 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 ("[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 Signed-off-by: Evan Jones Cc: Nicolas Dichtel Cc: Phil Sutter Cc: Toshiaki Makita Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Vijay Pandurangan --- drivers/net/veth.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 0ef4a5a..ba21d07 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); -- 2.5.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/