* [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach
@ 2019-04-27 13:14 Stephen Suryaputra
2019-04-27 17:27 ` David Ahern
2019-04-30 3:29 ` David Miller
0 siblings, 2 replies; 3+ messages in thread
From: Stephen Suryaputra @ 2019-04-27 13:14 UTC (permalink / raw)
To: netdev; +Cc: Stephen Suryaputra
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 <ssuryaextr@gmail.com>
Reviewed-by: David Ahern <dsahern@gmail.com>
Tested-by: David Ahern <dsahern@gmail.com>
---
net/ipv6/route.c | 23 +++++++++++++++++------
1 file changed, 17 insertions(+), 6 deletions(-)
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 7178e32eb15d..b4899f0de0d0 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3668,23 +3668,34 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
{
- int type;
struct dst_entry *dst = skb_dst(skb);
+ struct net *net = dev_net(dst->dev);
+ struct inet6_dev *idev;
+ int type;
+
+ if (netif_is_l3_master(skb->dev) &&
+ dst->dev == net->loopback_dev)
+ idev = __in6_dev_get_safely(dev_get_by_index_rcu(net, IP6CB(skb)->iif));
+ else
+ idev = ip6_dst_idev(dst);
+
switch (ipstats_mib_noroutes) {
case IPSTATS_MIB_INNOROUTES:
type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
if (type == IPV6_ADDR_ANY) {
- IP6_INC_STATS(dev_net(dst->dev),
- __in6_dev_get_safely(skb->dev),
- IPSTATS_MIB_INADDRERRORS);
+ IP6_INC_STATS(net, idev, IPSTATS_MIB_INADDRERRORS);
break;
}
/* FALLTHROUGH */
case IPSTATS_MIB_OUTNOROUTES:
- IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
- ipstats_mib_noroutes);
+ IP6_INC_STATS(net, idev, ipstats_mib_noroutes);
break;
}
+
+ /* Start over by dropping the dst for l3mdev case */
+ if (netif_is_l3_master(skb->dev))
+ skb_dst_drop(skb);
+
icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
kfree_skb(skb);
return 0;
--
2.17.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach
2019-04-27 13:14 [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach Stephen Suryaputra
@ 2019-04-27 17:27 ` David Ahern
2019-04-30 3:29 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Ahern @ 2019-04-27 17:27 UTC (permalink / raw)
To: Stephen Suryaputra, netdev
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 <ssuryaextr@gmail.com>
> Reviewed-by: David Ahern <dsahern@gmail.com>
> Tested-by: David Ahern <dsahern@gmail.com>
> ---
> net/ipv6/route.c | 23 +++++++++++++++++------
> 1 file changed, 17 insertions(+), 6 deletions(-)
>
Reviewed-by: David Ahern <dsahern@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach
2019-04-27 13:14 [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach Stephen Suryaputra
2019-04-27 17:27 ` David Ahern
@ 2019-04-30 3:29 ` David Miller
1 sibling, 0 replies; 3+ messages in thread
From: David Miller @ 2019-04-30 3:29 UTC (permalink / raw)
To: ssuryaextr; +Cc: netdev
From: Stephen Suryaputra <ssuryaextr@gmail.com>
Date: Sat, 27 Apr 2019 09:14:33 -0400
> 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.
...
> 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 <ssuryaextr@gmail.com>
> Reviewed-by: David Ahern <dsahern@gmail.com>
> Tested-by: David Ahern <dsahern@gmail.com>
Applied, thanks.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2019-04-30 3:30 UTC | newest]
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2019-04-27 13:14 [PATCH net,v3] vrf: Use orig netdev to count Ip6InNoRoutes and a fresh route lookup when sending dest unreach Stephen Suryaputra
2019-04-27 17:27 ` David Ahern
2019-04-30 3:29 ` David Miller
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