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Commit 7c85fbf0 authored by Patrick McHardy's avatar Patrick McHardy Committed by David S. Miller
Browse files

bridge: Use STP demux 



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

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a19800d7

net/bridge/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -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

net/bridge/br.c

+9 −7
Original line number Diff line number Diff line
@@ -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 @@ static int __init br_init(void) 
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;

net/bridge/br_private.h

+3 −2
Original line number Diff line number Diff line
@@ -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);

net/bridge/br_stp_bpdu.c

+3 −9
Original line number Diff line number Diff line
@@ -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;

}