sit: stateless autoconf for isatap

be sent periodically. The rs_delay can be speficied when adding the
PRL entry and defaults to 15 minutes.

The RS is sent from every link local adress that's assigned to the
tunnel interface. It's directed to the (guessed) linklocal address
of the router and is sent through the tunnel.

Better: send to ff02::2 encapsuled in unicast directed to router-v4.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/net/ipip.h b/include/net/ipip.h
index fdf9bd743705..5d3036fa1511 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -28,11 +28,18 @@ struct ip_tunnel
         unsigned int                    prl_count;      /* # of entries in PRL */
 };
 
+/* ISATAP: default interval between RS in secondy */
+#define IPTUNNEL_RS_DEFAULT_DELAY       (900)
+
 struct ip_tunnel_prl_entry
 {
         struct ip_tunnel_prl_entry      *next;
         __be32                          addr;
         u16                             flags;
+        unsigned long                   rs_delay;
+        struct timer_list               rs_timer;
+        struct ip_tunnel                *tunnel;
+        spinlock_t                      lock;
 };
 
 #define IPTUNNEL_XMIT() do {                                            \