On 4/27/19 7:14 AM, Stephen Suryaputra wrote: > When there is no route to an IPv6 dest addr, skb_dst(skb) points > to loopback dev in the case of that the IP6CB(skb)->iif is > enslaved to a vrf. This causes Ip6InNoRoutes to be incremented on the > loopback dev. This also causes the lookup to fail on icmpv6_send() and > the dest unreachable to not sent and Ip6OutNoRoutes gets incremented on > the loopback dev. > > To reproduce: > * Gateway configuration: > ip link add dev vrf_258 type vrf table 258 > ip link set dev enp0s9 master vrf_258 > ip addr add 66:1/64 dev enp0s9 > ip -6 route add unreachable default metric 8192 table 258 > sysctl -w net.ipv6.conf.all.forwarding=1 > sysctl -w net.ipv6.conf.enp0s9.forwarding=1 > * Sender configuration: > ip addr add 66::2/64 dev enp0s9 > ip -6 route add default via 66::1 > and ping 67::1 for example from the sender. > > Fix this by counting on the original netdev and reset the skb dst to > force a fresh lookup. > > v2: Fix typo of destination address in the repro steps. > v3: Simplify the loopback check (per David Ahern) and use reverse > Christmas tree format (per David Miller). > > Signed-off-by: Stephen Suryaputra <ssuryae...@gmail.com> > Reviewed-by: David Ahern <dsah...@gmail.com> > Tested-by: David Ahern <dsah...@gmail.com> > --- > net/ipv6/route.c | 23 +++++++++++++++++------ > 1 file changed, 17 insertions(+), 6 deletions(-) >
Reviewed-by: David Ahern <dsah...@gmail.com>
