---

yaml
---
r: 22324
b: refs/heads/master
c: cf0f02d
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 18fdb2b25be37e49b1669b5c394671f8c5b6550f
+refs/heads/master: cf0f02d04a830c8202e6a8f8bb37acc6c1629a91

trunk/net/bridge/Kconfig

@@ -4,6 +4,7 @@
 
 config BRIDGE
 	tristate "802.1d Ethernet Bridging"
+	select LLC
 	---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

trunk/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 int __init br_init(void)
 
 static void __exit br_deinit(void)
 {
+	llc_sap_close(br_stp_sap);
+
 #ifdef CONFIG_BRIDGE_NETFILTER
 	br_netfilter_fini();
 #endif

trunk/net/bridge/br_input.c

@@ -94,6 +94,25 @@ int br_handle_frame_finish(struct sk_buff *skb)
 	goto out;
 }
 
+/* note: already called with rcu_read_lock (preempt_disabled) */
+static int br_handle_local_finish(struct sk_buff *skb)
+{
+	struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
+
+	if (p && p->state != BR_STATE_DISABLED)
+		br_fdb_update(p->br, p, eth_hdr(skb)->h_source);
+
+	return 0;	 /* process further */
+}
+
+/* Does address match the link local multicast address.
+ * 01:80:c2:00:00:0X
+ */
+static inline int is_link_local(const unsigned char *dest)
+{
+	return memcmp(dest, bridge_ula, 5) == 0 && (dest[5] & 0xf0) == 0;
+}
+
 /*
  * Called via br_handle_frame_hook.
  * Return 0 if *pskb should be processed furthur
@@ -111,15 +130,10 @@ int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb)
 	if (!is_valid_ether_addr(eth_hdr(skb)->h_source))
 		goto err;
 
-	if (p->br->stp_enabled &&
-	    !memcmp(dest, bridge_ula, 5) &&
-	    !(dest[5] & 0xF0)) {
-		if (!dest[5]) {
-			NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev, 
-				NULL, br_stp_handle_bpdu);
-			return 1;
-		}
-		goto err;
+	if (unlikely(is_link_local(dest))) {
+		skb->pkt_type = PACKET_HOST;
+		return NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_IN, skb, skb->dev,
+			       NULL, br_handle_local_finish) != 0;
 	}
 
 	if (p->state == BR_STATE_FORWARDING || p->state == BR_STATE_LEARNING) {

trunk/net/bridge/br_private.h

@@ -217,7 +217,8 @@ 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_handle_bpdu(struct sk_buff *skb);
+extern int br_stp_rcv(struct sk_buff *skb, struct net_device *dev,
+		      struct packet_type *pt, struct net_device *orig_dev);
 
 /* br_stp_timer.c */
 extern void br_stp_timer_init(struct net_bridge *br);

trunk/net/bridge/br_stp_bpdu.c

@@ -15,6 +15,9 @@
 
 #include <linux/kernel.h>
 #include <linux/netfilter_bridge.h>
+#include <linux/etherdevice.h>
+#include <linux/llc.h>
+#include <net/llc_pdu.h>
 
 #include "br_private.h"
 #include "br_private_stp.h"
@@ -130,42 +133,54 @@ void br_send_tcn_bpdu(struct net_bridge_port *p)
 	br_send_bpdu(p, buf, 7);
 }
 
-static const unsigned char header[6] = {0x42, 0x42, 0x03, 0x00, 0x00, 0x00};
-
-/* NO locks, but rcu_read_lock (preempt_disabled)  */
-int br_stp_handle_bpdu(struct sk_buff *skb)
+/*
+ * Called from llc.
+ *
+ * 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)
 {
-	struct net_bridge_port *p = rcu_dereference(skb->dev->br_port);
+	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;
-	unsigned char *buf;
+	const unsigned char *buf;
 
 	if (!p)
 		goto err;
 
-	br = p->br;
-	spin_lock(&br->lock);
+	if (pdu->ssap != LLC_SAP_BSPAN
+	    || pdu->dsap != LLC_SAP_BSPAN
+	    || pdu->ctrl_1 != LLC_PDU_TYPE_U)
+		goto err;
 
-	if (p->state == BR_STATE_DISABLED || !(br->dev->flags & IFF_UP))
-		goto out;
+	if (!pskb_may_pull(skb, 4))
+		goto err;
+
+	/* compare of protocol id and version */
+	buf = skb->data;
+	if (buf[0] != 0 || buf[1] != 0 || buf[2] != 0)
+		goto err;
 
-	/* insert into forwarding database after filtering to avoid spoofing */
-	br_fdb_update(br, p, eth_hdr(skb)->h_source);
+	br = p->br;
+	spin_lock(&br->lock);
 
-	if (!br->stp_enabled)
+	if (p->state == BR_STATE_DISABLED
+	    || !br->stp_enabled
+	    || !(br->dev->flags & IFF_UP))
 		goto out;
 
-	/* need at least the 802 and STP headers */
-	if (!pskb_may_pull(skb, sizeof(header)+1) ||
-	    memcmp(skb->data, header, sizeof(header)))
+	if (compare_ether_addr(dest, bridge_ula) != 0)
 		goto out;
 
-	buf = skb_pull(skb, sizeof(header));
+	buf = skb_pull(skb, 3);
 
 	if (buf[0] == BPDU_TYPE_CONFIG) {
 		struct br_config_bpdu bpdu;
 
 		if (!pskb_may_pull(skb, 32))
-		    goto out;
+			goto out;
 
 		buf = skb->data;
 		bpdu.topology_change = (buf[1] & 0x01) ? 1 : 0;