lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-ID: <20120822111040.29174.4871.stgit@dragon>
Date:	Wed, 22 Aug 2012 13:11:18 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Simon Horman <horms@...ge.net.au>,
	Hans Schillstrom <hans@...illstrom.com>,
	lvs-devel@...r.kernel.org,
	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	netdev@...r.kernel.org, Julian Anastasov <ja@....bg>,
	Wensong Zhang <wensong@...ux-vs.org>,
	netfilter-devel@...r.kernel.org
Subject: [PATCH] ipvs: Fix GSO support for IPVS DR IPv6 mode

The MTU check in ip_vs_dr_xmit_v6() were missing a
check for skb_is_gso().

This e.g. caused issues for KVM IPVS setups, where different
Segmentation Offloading techniques are utilized, between guests,
via the virtio driver.  This resulted in very bad performance,
due to the ICMPv6 "too big" messages didn't affect the sender.

Signed-off-by: Jesper Dangaard Brouer <brouer@...hat.com>

---
To Simon,
This should perhaps go to stable?
The patch is based on ipvs-next, but will apply on ipvs with an offset.
Jesper

 net/netfilter/ipvs/ip_vs_xmit.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 543a554..80c3006 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -1113,7 +1113,7 @@ ip_vs_dr_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
 
 	/* MTU checking */
 	mtu = dst_mtu(&rt->dst);
-	if (skb->len > mtu) {
+	if (skb->len > mtu && !skb_is_gso(skb))) {
 		if (!skb->dev) {
 			struct net *net = dev_net(skb_dst(skb)->dev);
 

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ