[PATCH net-next] ipvs: fix ipv6 route unreach panic

To: <horms@xxxxxxxxxxxx>, <ja@xxxxxx>, <lvs-devel@xxxxxxxxxxxxxxx>
Subject: [PATCH net-next] ipvs: fix ipv6 route unreach panic
Cc: <kernel-team@xxxxxx>, Alex Gartrell <agartrell@xxxxxx>
From: Alex Gartrell <agartrell@xxxxxx>
Date: Fri, 26 Jun 2015 03:18:45 -0700
Previously there was a trivial panic

unshare -n /bin/bash <<EOF
ip addr add dev lo face::1/128
ipvsadm -A -t [face::1]:15213
ipvsadm -a -t [face::1]:15213 -r b00c::1
echo boom | nc face::1 15213

This patch allows us to replicate the net logic above and simply capture
the skb_dst(skb)->dev and use that for the purpose of the invocation.

Signed-off-by: Alex Gartrell <agartrell@xxxxxx>
 net/netfilter/ipvs/ip_vs_xmit.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index bf66a86..b99d806 100644
--- a/net/netfilter/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c
@@ -505,6 +505,13 @@ err_put:
        return -1;
+       /* The ip6_link_failure function requires the dev field to be set
+        * in order to get the net (further for the sake of fwmark
+        * reflection).
+        */
+       if (!skb->dev)
+               skb->dev = skb_dst(skb)->dev;
        return -1;
Alex Gartrell <agartrell@xxxxxx>

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