[BRIDGE]: use llc for receiving STP packets
Use LLC for the receive path of Spanning Tree Protocol packets.
This allows link local multicast packets to be received by
other protocols (if they care), and uses the existing LLC
code to get STP packets back into bridge code.
The bridge multicast address is also checked, so bridges using
other link local multicast addresses are ignored. This allows
for use of different multicast addresses to define separate STP
domains.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/bridge/br.c b/net/bridge/br.c
index 188cc1a..22d806c 100644
--- a/net/bridge/br.c
+++ b/net/bridge/br.c
@@ -19,13 +19,23 @@
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/init.h>
+#include <linux/llc.h>
+#include <net/llc.h>
#include "br_private.h"
int (*br_should_route_hook) (struct sk_buff **pskb) = NULL;
+static struct llc_sap *br_stp_sap;
+
static int __init br_init(void)
{
+ br_stp_sap = llc_sap_open(LLC_SAP_BSPAN, br_stp_rcv);
+ if (!br_stp_sap) {
+ printk(KERN_ERR "bridge: can't register sap for STP\n");
+ return -EBUSY;
+ }
+
br_fdb_init();
#ifdef CONFIG_BRIDGE_NETFILTER
@@ -45,6 +55,8 @@
static void __exit br_deinit(void)
{
+ llc_sap_close(br_stp_sap);
+
#ifdef CONFIG_BRIDGE_NETFILTER
br_netfilter_fini();
#endif