| Message ID | 20190326122043.328-1-martin@strongswan.org |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | David Miller |
| Headers | show |
| Series | [ipsec] xfrm: Honor original L3 slave device in xfrmi policy lookup | expand |
On Tue, Mar 26, 2019 at 01:20:43PM +0100, Martin Willi wrote: > 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: f203b76d7809 ("xfrm: Add virtual xfrm interfaces") > Signed-off-by: Martin Willi <martin@strongswan.org> Applied, thanks a lot Martin!
diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 902437dfbce7..c9b0b2b5d672 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -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); diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c index dbb3c1945b5c..85fec98676d3 100644 --- a/net/xfrm/xfrm_interface.c +++ b/net/xfrm/xfrm_interface.c @@ -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 && diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 8d1a898d0ba5..a6b58df7a70f 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -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;
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: f203b76d7809 ("xfrm: Add virtual xfrm interfaces") Signed-off-by: Martin Willi <martin@strongswan.org> --- include/net/xfrm.h | 3 ++- net/xfrm/xfrm_interface.c | 17 ++++++++++++++--- net/xfrm/xfrm_policy.c | 2 +- 3 files changed, 17 insertions(+), 5 deletions(-)