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authorSascha Hlusiak <contact@saschahlusiak.de>2009-05-19 12:56:52 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-19 16:02:02 -0700
commit645069299a1c7358cf7330afe293f07552f11a5d (patch)
tree889c39a10ef09cd77c5b052ef837bb4b53bddd83
parent9af28511be10e175eb0cabb2ba5cfafe77408d84 (diff)
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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>
-rw-r--r--include/linux/if_tunnel.h2
-rw-r--r--include/net/ipip.h7
-rw-r--r--net/ipv6/ndisc.c1
-rw-r--r--net/ipv6/sit.c58
4 files changed, 67 insertions, 1 deletions
diff --git a/include/linux/if_tunnel.h b/include/linux/if_tunnel.h
index 5a9aae4adb4..5eb9b0f857e 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 __reserved2;
+ __u32 rs_delay;
/* data follows */
};
diff --git a/include/net/ipip.h b/include/net/ipip.h
index fdf9bd74370..5d3036fa151 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 { \
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index ab65cc51b00..e09f12ee57c 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -658,6 +658,7 @@ 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 3fd060076e7..b3a59bd40f0 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -15,6 +15,7 @@
* 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>
@@ -222,6 +223,44 @@ 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)
{
@@ -280,6 +319,7 @@ 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;
@@ -329,11 +369,23 @@ 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;
@@ -352,6 +404,9 @@ 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;
@@ -362,6 +417,9 @@ 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--;
}