1 files changed, 101 insertions, 96 deletions

diff --git a/net/bridge/br_stp_bpdu.c b/net/bridge/br_stp_bpdu.c
index 296f6a487c5..a7ba0cce0b4 100644
--- a/net/bridge/br_stp_bpdu.c
+++ b/net/bridge/br_stp_bpdu.c
@@ -15,158 +15,163 @@
 
 #include <linux/kernel.h>
 #include <linux/netfilter_bridge.h>
+#include <linux/etherdevice.h>
+#include <linux/llc.h>
+#include <net/llc.h>
+#include <net/llc_pdu.h>
+#include <asm/unaligned.h>
 
 #include "br_private.h"
 #include "br_private_stp.h"
 
-#define JIFFIES_TO_TICKS(j) (((j) << 8) / HZ)
-#define TICKS_TO_JIFFIES(j) (((j) * HZ) >> 8)
+#define STP_HZ		256
 
-static void br_send_bpdu(struct net_bridge_port *p, unsigned char *data, int length)
+#define LLC_RESERVE sizeof(struct llc_pdu_un)
+
+static void br_send_bpdu(struct net_bridge_port *p,
+ 			 const unsigned char *data, int length)
 {
-	struct net_device *dev;
 	struct sk_buff *skb;
-	int size;
 
 	if (!p->br->stp_enabled)
 		return;
 
-	size = length + 2*ETH_ALEN + 2;
-	if (size < 60)
-		size = 60;
-
-	dev = p->dev;
-
-	if ((skb = dev_alloc_skb(size)) == NULL) {
-		printk(KERN_INFO "br: memory squeeze!\n");
+	skb = dev_alloc_skb(length+LLC_RESERVE);
+	if (!skb)
 		return;
-	}
 
-	skb->dev = dev;
+	skb->dev = p->dev;
 	skb->protocol = htons(ETH_P_802_2);
-	skb->mac.raw = skb_put(skb, size);
-	memcpy(skb->mac.raw, bridge_ula, ETH_ALEN);
-	memcpy(skb->mac.raw+ETH_ALEN, dev->dev_addr, ETH_ALEN);
-	skb->mac.raw[2*ETH_ALEN] = 0;
-	skb->mac.raw[2*ETH_ALEN+1] = length;
-	skb->nh.raw = skb->mac.raw + 2*ETH_ALEN + 2;
-	memcpy(skb->nh.raw, data, length);
-	memset(skb->nh.raw + length, 0xa5, size - length - 2*ETH_ALEN - 2);
+
+	skb_reserve(skb, LLC_RESERVE);
+	memcpy(__skb_put(skb, length), data, length);
+
+	llc_pdu_header_init(skb, LLC_PDU_TYPE_U, LLC_SAP_BSPAN,
+			    LLC_SAP_BSPAN, LLC_PDU_CMD);
+	llc_pdu_init_as_ui_cmd(skb);
+
+	llc_mac_hdr_init(skb, p->dev->dev_addr, p->br->group_addr);
 
 	NF_HOOK(PF_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
 		dev_queue_xmit);
 }
 
-static __inline__ void br_set_ticks(unsigned char *dest, int jiff)
+static inline void br_set_ticks(unsigned char *dest, int j)
 {
-	__u16 ticks;
+	unsigned long ticks = (STP_HZ * j)/ HZ;
 
-	ticks = JIFFIES_TO_TICKS(jiff);
-	dest[0] = (ticks >> 8) & 0xFF;
-	dest[1] = ticks & 0xFF;
+	put_unaligned(htons(ticks), (__be16 *)dest);
 }
 
-static __inline__ int br_get_ticks(unsigned char *dest)
+static inline int br_get_ticks(const unsigned char *src)
 {
-	return TICKS_TO_JIFFIES((dest[0] << 8) | dest[1]);
+	unsigned long ticks = ntohs(get_unaligned((__be16 *)src));
+
+	return (ticks * HZ + STP_HZ - 1) / STP_HZ;
 }
 
 /* called under bridge lock */
 void br_send_config_bpdu(struct net_bridge_port *p, struct br_config_bpdu *bpdu)
 {
-	unsigned char buf[38];
-
-	buf[0] = 0x42;
-	buf[1] = 0x42;
-	buf[2] = 0x03;
-	buf[3] = 0;
-	buf[4] = 0;
-	buf[5] = 0;
-	buf[6] = BPDU_TYPE_CONFIG;
-	buf[7] = (bpdu->topology_change ? 0x01 : 0) |
+	unsigned char buf[35];
+
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = BPDU_TYPE_CONFIG;
+	buf[4] = (bpdu->topology_change ? 0x01 : 0) |
 		(bpdu->topology_change_ack ? 0x80 : 0);
-	buf[8] = bpdu->root.prio[0];
-	buf[9] = bpdu->root.prio[1];
-	buf[10] = bpdu->root.addr[0];
-	buf[11] = bpdu->root.addr[1];
-	buf[12] = bpdu->root.addr[2];
-	buf[13] = bpdu->root.addr[3];
-	buf[14] = bpdu->root.addr[4];
-	buf[15] = bpdu->root.addr[5];
-	buf[16] = (bpdu->root_path_cost >> 24) & 0xFF;
-	buf[17] = (bpdu->root_path_cost >> 16) & 0xFF;
-	buf[18] = (bpdu->root_path_cost >> 8) & 0xFF;
-	buf[19] = bpdu->root_path_cost & 0xFF;
-	buf[20] = bpdu->bridge_id.prio[0];
-	buf[21] = bpdu->bridge_id.prio[1];
-	buf[22] = bpdu->bridge_id.addr[0];
-	buf[23] = bpdu->bridge_id.addr[1];
-	buf[24] = bpdu->bridge_id.addr[2];
-	buf[25] = bpdu->bridge_id.addr[3];
-	buf[26] = bpdu->bridge_id.addr[4];
-	buf[27] = bpdu->bridge_id.addr[5];
-	buf[28] = (bpdu->port_id >> 8) & 0xFF;
-	buf[29] = bpdu->port_id & 0xFF;
-
-	br_set_ticks(buf+30, bpdu->message_age);
-	br_set_ticks(buf+32, bpdu->max_age);
-	br_set_ticks(buf+34, bpdu->hello_time);
-	br_set_ticks(buf+36, bpdu->forward_delay);
-
-	br_send_bpdu(p, buf, 38);
+	buf[5] = bpdu->root.prio[0];
+	buf[6] = bpdu->root.prio[1];
+	buf[7] = bpdu->root.addr[0];
+	buf[8] = bpdu->root.addr[1];
+	buf[9] = bpdu->root.addr[2];
+	buf[10] = bpdu->root.addr[3];
+	buf[11] = bpdu->root.addr[4];
+	buf[12] = bpdu->root.addr[5];
+	buf[13] = (bpdu->root_path_cost >> 24) & 0xFF;
+	buf[14] = (bpdu->root_path_cost >> 16) & 0xFF;
+	buf[15] = (bpdu->root_path_cost >> 8) & 0xFF;
+	buf[16] = bpdu->root_path_cost & 0xFF;
+	buf[17] = bpdu->bridge_id.prio[0];
+	buf[18] = bpdu->bridge_id.prio[1];
+	buf[19] = bpdu->bridge_id.addr[0];
+	buf[20] = bpdu->bridge_id.addr[1];
+	buf[21] = bpdu->bridge_id.addr[2];
+	buf[22] = bpdu->bridge_id.addr[3];
+	buf[23] = bpdu->bridge_id.addr[4];
+	buf[24] = bpdu->bridge_id.addr[5];
+	buf[25] = (bpdu->port_id >> 8) & 0xFF;
+	buf[26] = bpdu->port_id & 0xFF;
+
+	br_set_ticks(buf+27, bpdu->message_age);
+	br_set_ticks(buf+29, bpdu->max_age);
+	br_set_ticks(buf+31, bpdu->hello_time);
+	br_set_ticks(buf+33, bpdu->forward_delay);
+
+	br_send_bpdu(p, buf, 35);
 }
 
 /* called under bridge lock */
 void br_send_tcn_bpdu(struct net_bridge_port *p)
 {
-	unsigned char buf[7];
-
-	buf[0] = 0x42;
-	buf[1] = 0x42;
-	buf[2] = 0x03;
-	buf[3] = 0;
-	buf[4] = 0;
-	buf[5] = 0;
-	buf[6] = BPDU_TYPE_TCN;
+	unsigned char buf[4];
+
+	buf[0] = 0;
+	buf[1] = 0;
+	buf[2] = 0;
+	buf[3] = BPDU_TYPE_TCN;
 	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, br->group_addr) != 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;