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xfrm: Honor original L3 slave device in xfrmi policy lookup

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If an xfrmi is associated to a vrf layer 3 master device,
xfrm_policy_check() fails after traffic decapsulation. The input
interface is replaced by the layer 3 master device, and hence
xfrmi_decode_session() can't match the xfrmi anymore to satisfy
policy checking.

Extend ingress xfrmi lookup to honor the original layer 3 slave
device, allowing xfrm interfaces to operate within a vrf domain.

Fixes: f203b76d78 ("xfrm: Add virtual xfrm interfaces")
Signed-off-by: Martin Willi <martin@strongswan.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Martin Willi 2019-03-26 13:20:43 +01:00 committed by Steffen Klassert
parent 8dfb4eba41
commit 025c65e119
3 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/net/xfrm.h
View File

@ -295,7 +295,8 @@ struct xfrm_replay {
};
struct xfrm_if_cb {
struct xfrm_if *(*decode_session)(struct sk_buff *skb);
struct xfrm_if *(*decode_session)(struct sk_buff *skb,
unsigned short family);
};
void xfrm_if_register_cb(const struct xfrm_if_cb *ifcb);

17
net/xfrm/xfrm_interface.c
View File

@ -70,17 +70,28 @@ static struct xfrm_if *xfrmi_lookup(struct net *net, struct xfrm_state *x)
return NULL;
}
static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb)
static struct xfrm_if *xfrmi_decode_session(struct sk_buff *skb,
unsigned short family)
{
struct xfrmi_net *xfrmn;
int ifindex;
struct xfrm_if *xi;
int ifindex = 0;
if (!secpath_exists(skb) || !skb->dev)
return NULL;
switch (family) {
case AF_INET6:
ifindex = inet6_sdif(skb);
break;
case AF_INET:
ifindex = inet_sdif(skb);
break;
}
if (!ifindex)
ifindex = skb->dev->ifindex;
xfrmn = net_generic(xs_net(xfrm_input_state(skb)), xfrmi_net_id);
ifindex = skb->dev->ifindex;
for_each_xfrmi_rcu(xfrmn->xfrmi[0], xi) {
if (ifindex == xi->dev->ifindex &&

2
net/xfrm/xfrm_policy.c
View File

@ -3313,7 +3313,7 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
ifcb = xfrm_if_get_cb();
if (ifcb) {
xi = ifcb->decode_session(skb);
xi = ifcb->decode_session(skb, family);
if (xi) {
if_id = xi->p.if_id;
net = xi->net;