Commit 63b11e75 authored by Brenden Blanco's avatar Brenden Blanco Committed by David S. Miller
Browse files

ipvlan: read direct ifindex instead of iflink

In the ipv4 outbound path of an ipvlan device in l3 mode, the ifindex is
being grabbed from dev_get_iflink. This works for the physical device
case, since as the documentation of that function notes: "Physical
interfaces have the same 'ifindex' and 'iflink' values.".  However, if
the master device is a veth, and the pairs are in separate net
namespaces, the route lookup will fail with -ENODEV due to outer veth
pair being in a separate namespace from the ipvlan master/routing

  ns0    |   ns1    |   ns2

In ipvlan_process_v4_outbound(), a packet sent from ipvl0 in the above
configuration will pass fl.flowi4_oif == veth0a to
ip_route_output_flow(), but *net == ns1.

Notice also that ipv6 processing is not using iflink. Since there is a
discrepancy in usage, fixup both v4 and v6 case to use local dev

Tested this with l3 ipvlan on top of veth, as well as with single
physical interface in the top namespace.

Signed-off-by: default avatarBrenden Blanco <>
Reviewed-by: default avatarJiri Benc <>
Acked-by: default avatarMahesh Bandewar <>
Signed-off-by: default avatarDavid S. Miller <>
parent dbf650b6
......@@ -348,7 +348,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
struct rtable *rt;
int err, ret = NET_XMIT_DROP;
struct flowi4 fl4 = {
.flowi4_oif = dev_get_iflink(dev),
.flowi4_oif = dev->ifindex,
.flowi4_tos = RT_TOS(ip4h->tos),
.flowi4_flags = FLOWI_FLAG_ANYSRC,
.daddr = ip4h->daddr,
......@@ -386,7 +386,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
struct dst_entry *dst;
int err, ret = NET_XMIT_DROP;
struct flowi6 fl6 = {
.flowi6_iif = skb->dev->ifindex,
.flowi6_iif = dev->ifindex,
.daddr = ip6h->daddr,
.saddr = ip6h->saddr,
.flowi6_flags = FLOWI_FLAG_ANYSRC,
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