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authorDavid Ahern <dsa@cumulusnetworks.com>2016-12-15 01:31:11 +0300
committerDavid S. Miller <davem@davemloft.net>2016-12-17 18:47:31 +0300
commiteb63ecc1706b3e094d0f57438b6c2067cfc299f2 (patch)
tree71250ff90a98632327742bfcd6b232b850ec2f91
parenta0f37efa82253994b99623dbf41eea8dd0ba169b (diff)
downloadlinux-eb63ecc1706b3e094d0f57438b6c2067cfc299f2.tar.xz
net: vrf: Drop conntrack data after pass through VRF device on Tx
Locally originated traffic in a VRF fails in the presence of a POSTROUTING rule. For example, $ iptables -t nat -A POSTROUTING -s 11.1.1.0/24 -j MASQUERADE $ ping -I red -c1 11.1.1.3 ping: Warning: source address might be selected on device other than red. PING 11.1.1.3 (11.1.1.3) from 11.1.1.2 red: 56(84) bytes of data. ping: sendmsg: Operation not permitted Worse, the above causes random corruption resulting in a panic in random places (I have not seen a consistent backtrace). Call nf_reset to drop the conntrack info following the pass through the VRF device. The nf_reset is needed on Tx but not Rx because of the order in which NF_HOOK's are hit: on Rx the VRF device is after the real ingress device and on Tx it is is before the real egress device. Connection tracking should be tied to the real egress device and not the VRF device. Fixes: 8f58336d3f78a ("net: Add ethernet header for pass through VRF device") Fixes: 35402e3136634 ("net: Add IPv6 support to VRF device") Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/vrf.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 015a1321c7dd..7532646c3b7b 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -366,6 +366,8 @@ static int vrf_finish_output6(struct net *net, struct sock *sk,
struct in6_addr *nexthop;
int ret;
+ nf_reset(skb);
+
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
@@ -547,6 +549,8 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
u32 nexthop;
int ret = -EINVAL;
+ nf_reset(skb);
+
/* Be paranoid, rather than too clever. */
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
struct sk_buff *skb2;