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xfrm: Fix inbound traffic via XFRM interfaces across network namespaces 

After moving an XFRM interface to another namespace it stays associated
with the original namespace (net in `struct xfrm_if` and the list keyed
with `xfrmi_net_id`), allowing processes in the new namespace to use
SAs/policies that were created in the original namespace.  For instance,
this allows a keying daemon in one namespace to establish IPsec SAs for
other namespaces without processes there having access to the keys or IKE
credentials.

This worked fine for outbound traffic, however, for inbound traffic the
lookup for the interfaces and the policies used the incorrect namespace
(the one the XFRM interface was moved to).

Fixes: f203b76d78 ("xfrm: Add virtual xfrm interfaces")
Signed-off-by: Tobias Brunner <tobias@strongswan.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
hifive-unleashed-5.1
Tobias Brunner 2019-02-18 10:49:39 +01:00 committed by Steffen Klassert
parent fc2d5cfdcf
commit 660899ddf0
2 changed files with 5 additions and 3 deletions
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4
net/xfrm/xfrm_interface.c
View File

@ -76,10 +76,10 @@ static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
int ifindex;
struct xfrm_if *xi;
if (!skb->dev)
if (!secpath_exists(skb) || !skb->dev)
return NULL;
xfrmn = net_generic(dev_net(skb->dev), xfrmi_net_id);
xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id);
ifindex = skb->dev->ifindex;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {

4
net/xfrm/xfrm_policy.c
View File

@ -3314,8 +3314,10 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
if (ifcb) {
xi = ifcb->decode_session(skb);
if (xi)
if (xi) {
if_id = xi->p.if_id;
net = xi->net;
}
}
rcu_read_unlock();