bridge: Use STP demux

Use the STP demux layer for receiving STP PDUs instead of directly
registering with LLC.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 16 insertions, 18 deletions

diff --git a/net/bridge/Kconfig b/net/bridge/Kconfig
index 12265aff7099..e143ca678881 100644
--- a/net/bridge/Kconfig
+++ b/net/bridge/Kconfig
@@ -5,6 +5,7 @@
 config BRIDGE
         tristate "802.1d Ethernet Bridging"
         select LLC
+        select STP
         ---help---
           If you say Y here, then your Linux box will be able to act as an
           Ethernet bridge, which means that the different Ethernet segments it
diff --git a/net/bridge/br.c b/net/bridge/br.c
index cede010f4ddd..573acdf6f9ff 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -18,21 +18,24 @@
 #include <linux/init.h>
 #include <linux/llc.h>
 #include <net/llc.h>
+#include <net/stp.h>
 
 #include "br_private.h"
 
 int (*br_should_route_hook)(struct sk_buff *skb);
 
-static struct llc_sap *br_stp_sap;
+static const struct stp_proto br_stp_proto = {
+        .rcv    = br_stp_rcv,
+};
 
 static int __init br_init(void)
 {
         int err;
 
-        br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
-        if (!br_stp_sap) {
+        err = stp_proto_register(&br_stp_proto);
+        if (err < 0) {
                 printk(KERN_ERR "bridge: can't register sap for STP\n");
-                return -EADDRINUSE;
+                return err;
         }
 
         err = br_fdb_init();
@@ -65,13 +68,13 @@ err_out2:
 err_out1:
         br_fdb_fini();
 err_out:
-        llc_sap_put(br_stp_sap);
+        stp_proto_unregister(&br_stp_proto);
         return err;
 }
 
 static void __exit br_deinit(void)
 {
-        rcu_assign_pointer(br_stp_sap->rcv_func, NULL);
+        stp_proto_unregister(&br_stp_proto);
 
         br_netlink_fini();
         unregister_netdevice_notifier(&br_device_notifier);
@@ -82,7 +85,6 @@ static void __exit br_deinit(void)
         synchronize_net();
 
         br_netfilter_fini();
-        llc_sap_put(br_stp_sap);
         br_fdb_get_hook = NULL;
         br_fdb_put_hook = NULL;
 
diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h
index 8593c9f6a302..815ed38925b2 100644
--- a/net/bridge/br_private.h
+++ b/net/bridge/br_private.h
@@ -226,8 +226,9 @@ extern void br_stp_set_path_cost(struct net_bridge_port *p,
 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 
 /* br_stp_bpdu.c */
-extern int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
-                      struct packet_type *pt, struct net_device *orig_dev);
+struct stp_proto;
+extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
+                       struct net_device *dev);
 
 /* br_stp_timer.c */
 extern void br_stp_timer_init(struct net_bridge *br);
diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 9dc2de656965..996476174517 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -18,6 +18,7 @@
 #include <net/net_namespace.h>
 #include <net/llc.h>
 #include <net/llc_pdu.h>
+#include <net/stp.h>
 #include <asm/unaligned.h>
 
 #include "br_private.h"
@@ -131,10 +132,9 @@ void br_send_tcn_bpdu(struct net_bridge_port *p)
  *
  * NO locks, but rcu_read_lock (preempt_disabled)
  */
-int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
-               struct packet_type *pt, struct net_device *orig_dev)
+void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
+                struct net_device *dev)
 {
-        const struct llc_pdu_un *pdu = llc_pdu_un_hdr(skb);
         const unsigned char *dest = eth_hdr(skb)->h_dest;
         struct net_bridge_port *p = rcu_dereference(dev->br_port);
         struct net_bridge *br;
@@ -146,11 +146,6 @@ int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
         if (!p)
                 goto err;
 
-        if (pdu->ssap != LLC_SAP_BSPAN
-            || pdu->dsap != LLC_SAP_BSPAN
-            || pdu->ctrl_1 != LLC_PDU_TYPE_U)
-                goto err;
-
         if (!pskb_may_pull(skb, 4))
                 goto err;
 
@@ -224,5 +219,4 @@ int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
         spin_unlock(&br->lock);
  err:
         kfree_skb(skb);
-        return 0;
 }