ip_vti: Fix 'ip tunnel add' with 'key' parameters

ip tunnel add remote 10.2.2.1 local 10.2.2.2 mode vti ikey 1 okey 2
translates to p->iflags = VTI_ISVTI|GRE_KEY and p->i_key = 1, but GRE_KEY !=
TUNNEL_KEY, so ip_tunnel_ioctl would set i_key to 0 (same story with o_key)
making us unable to create vti tunnels with [io]key via ip tunnel.

We cannot simply translate GRE_KEY to TUNNEL_KEY (as GRE module does) because
vti_tunnels with same local/remote addresses but different ikeys will be treated
as different then. So, imo the best option here is to move p->i_flags & *_KEY
check for vti tunnels from ip_tunnel.c to ip_vti.c and to think about [io]_mark
field for ip_tunnel_parm in the future.

Signed-off-by: Dmitry Popov <ixaphire@qrator.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 3f6135b..3dbb550 100644 (file)
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -748,10 +748,12 @@ int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
                        goto done;
                if (p->iph.ttl)
                        p->iph.frag_off |= htons(IP_DF);
-               if (!(p->i_flags&TUNNEL_KEY))
-                       p->i_key = 0;
-               if (!(p->o_flags&TUNNEL_KEY))
-                       p->o_key = 0;
+               if (!(p->i_flags & VTI_ISVTI)) {
+                       if (!(p->i_flags & TUNNEL_KEY))
+                               p->i_key = 0;
+                       if (!(p->o_flags & TUNNEL_KEY))
+                               p->o_key = 0;
+               }
 
                t = ip_tunnel_find(itn, p, itn->fb_tunnel_dev->type);
 

diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c
index 13ef00f..b8960f3 100644 (file)
--- a/net/ipv4/ip_vti.c
+++ b/net/ipv4/ip_vti.c
@@ -313,7 +313,13 @@ vti_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
                        return -EINVAL;
        }
 
-       p.i_flags |= VTI_ISVTI;
+       if (!(p.i_flags & GRE_KEY))
+               p.i_key = 0;
+       if (!(p.o_flags & GRE_KEY))
+               p.o_key = 0;
+
+       p.i_flags = VTI_ISVTI;
+
        err = ip_tunnel_ioctl(dev, &p, cmd);
        if (err)
                return err;