1 files changed, 44 insertions, 381 deletions

diff --git a/net/hsr/hsr_main.c b/net/hsr/hsr_main.c
index 3fee5218a691..779d28b65417 100644
--- a/net/hsr/hsr_main.c
+++ b/net/hsr/hsr_main.c
@@ -1,4 +1,4 @@
-/* Copyright 2011-2013 Autronica Fire and Security AS
+/* Copyright 2011-2014 Autronica Fire and Security AS
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the Free
@@ -6,11 +6,7 @@
  * any later version.
  *
  * Author(s):
- *	2011-2013 Arvid Brodin, arvid.brodin@xdin.com
- *
- * In addition to routines for registering and unregistering HSR support, this
- * file also contains the receive routine that handles all incoming frames with
- * Ethertype (protocol) ETH_P_PRP (HSRv0), and network device event handling.
+ *	2011-2014 Arvid Brodin, arvid.brodin@alten.se
  */
 
 #include <linux/netdevice.h>
@@ -21,154 +17,71 @@
 #include "hsr_device.h"
 #include "hsr_netlink.h"
 #include "hsr_framereg.h"
-
-
-/* List of all registered virtual HSR devices */
-static LIST_HEAD(hsr_list);
-
-void register_hsr_master(struct hsr_priv *hsr_priv)
-{
-	list_add_tail_rcu(&hsr_priv->hsr_list, &hsr_list);
-}
-
-void unregister_hsr_master(struct hsr_priv *hsr_priv)
-{
-	struct hsr_priv *hsr_priv_it;
-
-	list_for_each_entry(hsr_priv_it, &hsr_list, hsr_list)
-		if (hsr_priv_it == hsr_priv) {
-			list_del_rcu(&hsr_priv_it->hsr_list);
-			return;
-		}
-}
-
-bool is_hsr_slave(struct net_device *dev)
-{
-	struct hsr_priv *hsr_priv_it;
-
-	list_for_each_entry_rcu(hsr_priv_it, &hsr_list, hsr_list) {
-		if (dev == hsr_priv_it->slave[0])
-			return true;
-		if (dev == hsr_priv_it->slave[1])
-			return true;
-	}
-
-	return false;
-}
-
-
-/* If dev is a HSR slave device, return the virtual master device. Return NULL
- * otherwise.
- */
-static struct hsr_priv *get_hsr_master(struct net_device *dev)
-{
-	struct hsr_priv *hsr_priv;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(hsr_priv, &hsr_list, hsr_list)
-		if ((dev == hsr_priv->slave[0]) ||
-		    (dev == hsr_priv->slave[1])) {
-			rcu_read_unlock();
-			return hsr_priv;
-		}
-
-	rcu_read_unlock();
-	return NULL;
-}
-
-
-/* If dev is a HSR slave device, return the other slave device. Return NULL
- * otherwise.
- */
-static struct net_device *get_other_slave(struct hsr_priv *hsr_priv,
-					  struct net_device *dev)
-{
-	if (dev == hsr_priv->slave[0])
-		return hsr_priv->slave[1];
-	if (dev == hsr_priv->slave[1])
-		return hsr_priv->slave[0];
-
-	return NULL;
-}
+#include "hsr_slave.h"
 
 
 static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 			     void *ptr)
 {
-	struct net_device *slave, *other_slave;
-	struct hsr_priv *hsr_priv;
-	int old_operstate;
+	struct net_device *dev;
+	struct hsr_port *port, *master;
+	struct hsr_priv *hsr;
 	int mtu_max;
 	int res;
-	struct net_device *dev;
 
 	dev = netdev_notifier_info_to_dev(ptr);
-
-	hsr_priv = get_hsr_master(dev);
-	if (hsr_priv) {
-		/* dev is a slave device */
-		slave = dev;
-		other_slave = get_other_slave(hsr_priv, slave);
-	} else {
+	port = hsr_port_get_rtnl(dev);
+	if (port == NULL) {
 		if (!is_hsr_master(dev))
-			return NOTIFY_DONE;
-		hsr_priv = netdev_priv(dev);
-		slave = hsr_priv->slave[0];
-		other_slave = hsr_priv->slave[1];
+			return NOTIFY_DONE;	/* Not an HSR device */
+		hsr = netdev_priv(dev);
+		port = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+	} else {
+		hsr = port->hsr;
 	}
 
 	switch (event) {
 	case NETDEV_UP:		/* Administrative state DOWN */
 	case NETDEV_DOWN:	/* Administrative state UP */
 	case NETDEV_CHANGE:	/* Link (carrier) state changes */
-		old_operstate = hsr_priv->dev->operstate;
-		hsr_set_carrier(hsr_priv->dev, slave, other_slave);
-		/* netif_stacked_transfer_operstate() cannot be used here since
-		 * it doesn't set IF_OPER_LOWERLAYERDOWN (?)
-		 */
-		hsr_set_operstate(hsr_priv->dev, slave, other_slave);
-		hsr_check_announce(hsr_priv->dev, old_operstate);
+		hsr_check_carrier_and_operstate(hsr);
 		break;
 	case NETDEV_CHANGEADDR:
-
-		/* This should not happen since there's no ndo_set_mac_address()
-		 * for HSR devices - i.e. not supported.
-		 */
-		if (dev == hsr_priv->dev)
+		if (port->type == HSR_PT_MASTER) {
+			/* This should not happen since there's no
+			 * ndo_set_mac_address() for HSR devices - i.e. not
+			 * supported.
+			 */
 			break;
+		}
 
-		if (dev == hsr_priv->slave[0])
-			ether_addr_copy(hsr_priv->dev->dev_addr,
-					hsr_priv->slave[0]->dev_addr);
+		master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
+
+		if (port->type == HSR_PT_SLAVE_A) {
+			ether_addr_copy(master->dev->dev_addr, dev->dev_addr);
+			call_netdevice_notifiers(NETDEV_CHANGEADDR, master->dev);
+		}
 
 		/* Make sure we recognize frames from ourselves in hsr_rcv() */
-		res = hsr_create_self_node(&hsr_priv->self_node_db,
-					   hsr_priv->dev->dev_addr,
-					   hsr_priv->slave[1] ?
-						hsr_priv->slave[1]->dev_addr :
-						hsr_priv->dev->dev_addr);
+		port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
+		res = hsr_create_self_node(&hsr->self_node_db,
+					   master->dev->dev_addr,
+					   port ?
+						port->dev->dev_addr :
+						master->dev->dev_addr);
 		if (res)
-			netdev_warn(hsr_priv->dev,
+			netdev_warn(master->dev,
 				    "Could not update HSR node address.\n");
-
-		if (dev == hsr_priv->slave[0])
-			call_netdevice_notifiers(NETDEV_CHANGEADDR, hsr_priv->dev);
 		break;
 	case NETDEV_CHANGEMTU:
-		if (dev == hsr_priv->dev)
+		if (port->type == HSR_PT_MASTER)
 			break; /* Handled in ndo_change_mtu() */
-		mtu_max = hsr_get_max_mtu(hsr_priv);
-		if (hsr_priv->dev->mtu > mtu_max)
-			dev_set_mtu(hsr_priv->dev, mtu_max);
+		mtu_max = hsr_get_max_mtu(port->hsr);
+		master = hsr_port_get_hsr(port->hsr, HSR_PT_MASTER);
+		master->dev->mtu = mtu_max;
 		break;
 	case NETDEV_UNREGISTER:
-		if (dev == hsr_priv->slave[0])
-			hsr_priv->slave[0] = NULL;
-		if (dev == hsr_priv->slave[1])
-			hsr_priv->slave[1] = NULL;
-
-		/* There should really be a way to set a new slave device... */
-
+		hsr_del_port(port);
 		break;
 	case NETDEV_PRE_TYPE_CHANGE:
 		/* HSR works only on Ethernet devices. Refuse slave to change
@@ -181,255 +94,16 @@ static int hsr_netdev_notify(struct notifier_block *nb, unsigned long event,
 }
 
 
-static struct timer_list prune_timer;
-
-static void prune_nodes_all(unsigned long data)
-{
-	struct hsr_priv *hsr_priv;
-
-	rcu_read_lock();
-	list_for_each_entry_rcu(hsr_priv, &hsr_list, hsr_list)
-		hsr_prune_nodes(hsr_priv);
-	rcu_read_unlock();
-
-	prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
-	add_timer(&prune_timer);
-}
-
-
-static struct sk_buff *hsr_pull_tag(struct sk_buff *skb)
+struct hsr_port *hsr_port_get_hsr(struct hsr_priv *hsr, enum hsr_port_type pt)
 {
-	struct hsr_tag *hsr_tag;
-	struct sk_buff *skb2;
-
-	skb2 = skb_share_check(skb, GFP_ATOMIC);
-	if (unlikely(!skb2))
-		goto err_free;
-	skb = skb2;
-
-	if (unlikely(!pskb_may_pull(skb, HSR_TAGLEN)))
-		goto err_free;
+	struct hsr_port *port;
 
-	hsr_tag = (struct hsr_tag *) skb->data;
-	skb->protocol = hsr_tag->encap_proto;
-	skb_pull(skb, HSR_TAGLEN);
-
-	return skb;
-
-err_free:
-	kfree_skb(skb);
+	hsr_for_each_port(hsr, port)
+		if (port->type == pt)
+			return port;
 	return NULL;
 }
 
-
-/* The uses I can see for these HSR supervision frames are:
- * 1) Use the frames that are sent after node initialization ("HSR_TLV.Type =
- *    22") to reset any sequence_nr counters belonging to that node. Useful if
- *    the other node's counter has been reset for some reason.
- *    --
- *    Or not - resetting the counter and bridging the frame would create a
- *    loop, unfortunately.
- *
- * 2) Use the LifeCheck frames to detect ring breaks. I.e. if no LifeCheck
- *    frame is received from a particular node, we know something is wrong.
- *    We just register these (as with normal frames) and throw them away.
- *
- * 3) Allow different MAC addresses for the two slave interfaces, using the
- *    MacAddressA field.
- */
-static bool is_supervision_frame(struct hsr_priv *hsr_priv, struct sk_buff *skb)
-{
-	struct hsr_sup_tag *hsr_stag;
-
-	if (!ether_addr_equal(eth_hdr(skb)->h_dest,
-			      hsr_priv->sup_multicast_addr))
-		return false;
-
-	hsr_stag = (struct hsr_sup_tag *) skb->data;
-	if (get_hsr_stag_path(hsr_stag) != 0x0f)
-		return false;
-	if ((hsr_stag->HSR_TLV_Type != HSR_TLV_ANNOUNCE) &&
-	    (hsr_stag->HSR_TLV_Type != HSR_TLV_LIFE_CHECK))
-		return false;
-	if (hsr_stag->HSR_TLV_Length != 12)
-		return false;
-
-	return true;
-}
-
-
-/* Implementation somewhat according to IEC-62439-3, p. 43
- */
-static int hsr_rcv(struct sk_buff *skb, struct net_device *dev,
-		   struct packet_type *pt, struct net_device *orig_dev)
-{
-	struct hsr_priv *hsr_priv;
-	struct net_device *other_slave;
-	struct node_entry *node;
-	bool deliver_to_self;
-	struct sk_buff *skb_deliver;
-	enum hsr_dev_idx dev_in_idx, dev_other_idx;
-	bool dup_out;
-	int ret;
-
-	hsr_priv = get_hsr_master(dev);
-
-	if (!hsr_priv) {
-		/* Non-HSR-slave device 'dev' is connected to a HSR network */
-		kfree_skb(skb);
-		dev->stats.rx_errors++;
-		return NET_RX_SUCCESS;
-	}
-
-	if (dev == hsr_priv->slave[0]) {
-		dev_in_idx = HSR_DEV_SLAVE_A;
-		dev_other_idx = HSR_DEV_SLAVE_B;
-	} else {
-		dev_in_idx = HSR_DEV_SLAVE_B;
-		dev_other_idx = HSR_DEV_SLAVE_A;
-	}
-
-	node = hsr_find_node(&hsr_priv->self_node_db, skb);
-	if (node) {
-		/* Always kill frames sent by ourselves */
-		kfree_skb(skb);
-		return NET_RX_SUCCESS;
-	}
-
-	/* Is this frame a candidate for local reception? */
-	deliver_to_self = false;
-	if ((skb->pkt_type == PACKET_HOST) ||
-	    (skb->pkt_type == PACKET_MULTICAST) ||
-	    (skb->pkt_type == PACKET_BROADCAST))
-		deliver_to_self = true;
-	else if (ether_addr_equal(eth_hdr(skb)->h_dest,
-				     hsr_priv->dev->dev_addr)) {
-		skb->pkt_type = PACKET_HOST;
-		deliver_to_self = true;
-	}
-
-
-	rcu_read_lock(); /* node_db */
-	node = hsr_find_node(&hsr_priv->node_db, skb);
-
-	if (is_supervision_frame(hsr_priv, skb)) {
-		skb_pull(skb, sizeof(struct hsr_sup_tag));
-		node = hsr_merge_node(hsr_priv, node, skb, dev_in_idx);
-		if (!node) {
-			rcu_read_unlock(); /* node_db */
-			kfree_skb(skb);
-			hsr_priv->dev->stats.rx_dropped++;
-			return NET_RX_DROP;
-		}
-		skb_push(skb, sizeof(struct hsr_sup_tag));
-		deliver_to_self = false;
-	}
-
-	if (!node) {
-		/* Source node unknown; this might be a HSR frame from
-		 * another net (different multicast address). Ignore it.
-		 */
-		rcu_read_unlock(); /* node_db */
-		kfree_skb(skb);
-		return NET_RX_SUCCESS;
-	}
-
-	/* Register ALL incoming frames as outgoing through the other interface.
-	 * This allows us to register frames as incoming only if they are valid
-	 * for the receiving interface, without using a specific counter for
-	 * incoming frames.
-	 */
-	dup_out = hsr_register_frame_out(node, dev_other_idx, skb);
-	if (!dup_out)
-		hsr_register_frame_in(node, dev_in_idx);
-
-	/* Forward this frame? */
-	if (!dup_out && (skb->pkt_type != PACKET_HOST))
-		other_slave = get_other_slave(hsr_priv, dev);
-	else
-		other_slave = NULL;
-
-	if (hsr_register_frame_out(node, HSR_DEV_MASTER, skb))
-		deliver_to_self = false;
-
-	rcu_read_unlock(); /* node_db */
-
-	if (!deliver_to_self && !other_slave) {
-		kfree_skb(skb);
-		/* Circulated frame; silently remove it. */
-		return NET_RX_SUCCESS;
-	}
-
-	skb_deliver = skb;
-	if (deliver_to_self && other_slave) {
-		/* skb_clone() is not enough since we will strip the hsr tag
-		 * and do address substitution below
-		 */
-		skb_deliver = pskb_copy(skb, GFP_ATOMIC);
-		if (!skb_deliver) {
-			deliver_to_self = false;
-			hsr_priv->dev->stats.rx_dropped++;
-		}
-	}
-
-	if (deliver_to_self) {
-		bool multicast_frame;
-
-		skb_deliver = hsr_pull_tag(skb_deliver);
-		if (!skb_deliver) {
-			hsr_priv->dev->stats.rx_dropped++;
-			goto forward;
-		}
-#if !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
-		/* Move everything in the header that is after the HSR tag,
-		 * to work around alignment problems caused by the 6-byte HSR
-		 * tag. In practice, this removes/overwrites the HSR tag in
-		 * the header and restores a "standard" packet.
-		 */
-		memmove(skb_deliver->data - HSR_TAGLEN, skb_deliver->data,
-			skb_headlen(skb_deliver));
-
-		/* Adjust skb members so they correspond with the move above.
-		 * This cannot possibly underflow skb->data since hsr_pull_tag()
-		 * above succeeded.
-		 * At this point in the protocol stack, the transport and
-		 * network headers have not been set yet, and we haven't touched
-		 * the mac header nor the head. So we only need to adjust data
-		 * and tail:
-		 */
-		skb_deliver->data -= HSR_TAGLEN;
-		skb_deliver->tail -= HSR_TAGLEN;
-#endif
-		skb_deliver->dev = hsr_priv->dev;
-		hsr_addr_subst_source(hsr_priv, skb_deliver);
-		multicast_frame = (skb_deliver->pkt_type == PACKET_MULTICAST);
-		ret = netif_rx(skb_deliver);
-		if (ret == NET_RX_DROP) {
-			hsr_priv->dev->stats.rx_dropped++;
-		} else {
-			hsr_priv->dev->stats.rx_packets++;
-			hsr_priv->dev->stats.rx_bytes += skb->len;
-			if (multicast_frame)
-				hsr_priv->dev->stats.multicast++;
-		}
-	}
-
-forward:
-	if (other_slave) {
-		skb_push(skb, ETH_HLEN);
-		skb->dev = other_slave;
-		dev_queue_xmit(skb);
-	}
-
-	return NET_RX_SUCCESS;
-}
-
-
-static struct packet_type hsr_pt __read_mostly = {
-	.type = htons(ETH_P_PRP),
-	.func = hsr_rcv,
-};
-
 static struct notifier_block hsr_nb = {
 	.notifier_call = hsr_netdev_notify,	/* Slave event notifications */
 };
@@ -439,18 +113,9 @@ static int __init hsr_init(void)
 {
 	int res;
 
-	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_TAGLEN);
-
-	dev_add_pack(&hsr_pt);
-
-	init_timer(&prune_timer);
-	prune_timer.function = prune_nodes_all;
-	prune_timer.data = 0;
-	prune_timer.expires = jiffies + msecs_to_jiffies(PRUNE_PERIOD);
-	add_timer(&prune_timer);
+	BUILD_BUG_ON(sizeof(struct hsr_tag) != HSR_HLEN);
 
 	register_netdevice_notifier(&hsr_nb);
-
 	res = hsr_netlink_init();
 
 	return res;
@@ -459,9 +124,7 @@ static int __init hsr_init(void)
 static void __exit hsr_exit(void)
 {
 	unregister_netdevice_notifier(&hsr_nb);
-	del_timer_sync(&prune_timer);
 	hsr_netlink_exit();
-	dev_remove_pack(&hsr_pt);
 }
 
 module_init(hsr_init);