Revert "sit: stateless autoconf for isatap"

This reverts commit 645069299a1c7358cf7330afe293f07552f11a5d.

While the code does not actually break anything, it does not completely follow
RFC5214 yet. After talking back with Fred L. Templin, I agree that completing the
ISATAP specific RS/RA code, would pollute the kernel a lot with code that is better
implemented in userspace.

The kernel should not send RS packages for ISATAP at all.

Signed-off-by: Sascha Hlusiak <contact@saschahlusiak.de>
Acked-by: Fred L. Templin <Fred.L.Templin@boeing.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 1 insertions, 67 deletions

diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 5eb9b0f857e0..5a9aae4adb44 100644
--- a/include/linux/if_tunnel.h
+++ b/include/linux/if_tunnel.h
@@ -44,7 +44,7 @@ struct ip_tunnel_prl {
         __u16                   flags;
         __u16                   __reserved;
         __u32                   datalen;
-        __u32                   rs_delay;
+        __u32                   __reserved2;
         /* data follows */
 };
 
diff --git a/include/net/ipip.h b/include/net/ipip.h
index 76e3ea6e2fe5..87acf8f3a155 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -27,18 +27,11 @@ 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 {                                            \
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 498b9b0b0fad..f74e4e2cdd06 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -658,7 +658,6 @@ void ndisc_send_rs(struct net_device *dev, const struct in6_addr *saddr,
                      &icmp6h, NULL,
                      send_sllao ? ND_OPT_SOURCE_LL_ADDR : 0);
 }
-EXPORT_SYMBOL(ndisc_send_rs);
 
 
 static void ndisc_error_report(struct neighbour *neigh, struct sk_buff *skb)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index fcb539628847..d65e0c496cc0 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -15,7 +15,6 @@
  * Roger Venning <r.venning@telstra.com>:       6to4 support
  * Nate Thompson <nate@thebog.net>:             6to4 support
  * Fred Templin <fred.l.templin@boeing.com>:    isatap support
- * Sascha Hlusiak <mail@saschahlusiak.de>:      stateless autoconf for isatap
  */
 
 #include <linux/module.h>
@@ -223,44 +222,6 @@ failed:
         return NULL;
 }
 
-static void ipip6_tunnel_rs_timer(unsigned long data)
-{
-        struct ip_tunnel_prl_entry *p = (struct ip_tunnel_prl_entry *) data;
-        struct inet6_dev *ifp;
-        struct inet6_ifaddr *addr;
-
-        spin_lock(&p->lock);
-        ifp = __in6_dev_get(p->tunnel->dev);
-
-        read_lock_bh(&ifp->lock);
-        for (addr = ifp->addr_list; addr; addr = addr->if_next) {
-                struct in6_addr rtr;
-
-                if (!(ipv6_addr_type(&addr->addr) & IPV6_ADDR_LINKLOCAL))
-                        continue;
-
-                /* Send RS to guessed linklocal address of router
-                 *
-                 * Better: send to ff02::2 encapsuled in unicast directly
-                 * to router-v4 instead of guessing the v6 address.
-                 *
-                 * Cisco/Windows seem to not set the u/l bit correctly,
-                 * so we won't guess right.
-                 */
-                ipv6_addr_set(&rtr,  htonl(0xFE800000), 0, 0, 0);
-                if (!__ipv6_isatap_ifid(rtr.s6_addr + 8,
-                                        p->addr)) {
-                        ndisc_send_rs(p->tunnel->dev, &addr->addr, &rtr);
-                }
-        }
-        read_unlock_bh(&ifp->lock);
-
-        mod_timer(&p->rs_timer, jiffies + HZ * p->rs_delay);
-        spin_unlock(&p->lock);
-
-        return;
-}
-
 static struct ip_tunnel_prl_entry *
 __ipip6_tunnel_locate_prl(struct ip_tunnel *t, __be32 addr)
 {
@@ -319,7 +280,6 @@ static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
                         continue;
                 kp[c].addr = prl->addr;
                 kp[c].flags = prl->flags;
-                kp[c].rs_delay = prl->rs_delay;
                 c++;
                 if (kprl.addr != htonl(INADDR_ANY))
                         break;
@@ -369,23 +329,11 @@ ipip6_tunnel_add_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a, int chg)
         }
 
         p->next = t->prl;
-        p->tunnel = t;
         t->prl = p;
         t->prl_count++;
-
-        spin_lock_init(&p->lock);
-        setup_timer(&p->rs_timer, ipip6_tunnel_rs_timer, (unsigned long) p);
 update:
         p->addr = a->addr;
         p->flags = a->flags;
-        p->rs_delay = a->rs_delay;
-        if (p->rs_delay == 0)
-                p->rs_delay = IPTUNNEL_RS_DEFAULT_DELAY;
-        spin_lock(&p->lock);
-        del_timer(&p->rs_timer);
-        if (p->flags & PRL_DEFAULT)
-                mod_timer(&p->rs_timer, jiffies + 1);
-        spin_unlock(&p->lock);
 out:
         write_unlock(&ipip6_lock);
         return err;
@@ -404,9 +352,6 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
                         if ((*p)->addr == a->addr) {
                                 x = *p;
                                 *p = x->next;
-                                spin_lock(&x->lock);
-                                del_timer(&x->rs_timer);
-                                spin_unlock(&x->lock);
                                 kfree(x);
                                 t->prl_count--;
                                 goto out;
@@ -417,9 +362,6 @@ ipip6_tunnel_del_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
                 while (t->prl) {
                         x = t->prl;
                         t->prl = t->prl->next;
-                        spin_lock(&x->lock);
-                        del_timer(&x->rs_timer);
-                        spin_unlock(&x->lock);
                         kfree(x);
                         t->prl_count--;
                 }