Linux-libre 4.6.2-gnu

1 files changed, 359 insertions, 0 deletions

diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
new file mode 100644
index 000000000..4026f198a
--- /dev/null
+++ b/net/batman-adv/bat_v.c
@@ -0,0 +1,359 @@
+/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bat_algo.h"
+#include "main.h"
+
+#include <linux/atomic.h>
+#include <linux/bug.h>
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/jiffies.h>
+#include <linux/netdevice.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/seq_file.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include "bat_v_elp.h"
+#include "bat_v_ogm.h"
+#include "hard-interface.h"
+#include "hash.h"
+#include "originator.h"
+#include "packet.h"
+
+static void batadv_v_iface_activate(struct batadv_hard_iface *hard_iface)
+{
+	/* B.A.T.M.A.N. V does not use any queuing mechanism, therefore it can
+	 * set the interface as ACTIVE right away, without any risk of race
+	 * condition
+	 */
+	if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
+		hard_iface->if_status = BATADV_IF_ACTIVE;
+}
+
+static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
+{
+	int ret;
+
+	ret = batadv_v_elp_iface_enable(hard_iface);
+	if (ret < 0)
+		return ret;
+
+	ret = batadv_v_ogm_iface_enable(hard_iface);
+	if (ret < 0)
+		batadv_v_elp_iface_disable(hard_iface);
+
+	/* enable link throughput auto-detection by setting the throughput
+	 * override to zero
+	 */
+	atomic_set(&hard_iface->bat_v.throughput_override, 0);
+
+	return ret;
+}
+
+static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface)
+{
+	batadv_v_elp_iface_disable(hard_iface);
+}
+
+static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface)
+{
+}
+
+static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface)
+{
+	batadv_v_elp_primary_iface_set(hard_iface);
+	batadv_v_ogm_primary_iface_set(hard_iface);
+}
+
+static void
+batadv_v_hardif_neigh_init(struct batadv_hardif_neigh_node *hardif_neigh)
+{
+	ewma_throughput_init(&hardif_neigh->bat_v.throughput);
+	INIT_WORK(&hardif_neigh->bat_v.metric_work,
+		  batadv_v_elp_throughput_metric_update);
+}
+
+static void batadv_v_ogm_schedule(struct batadv_hard_iface *hard_iface)
+{
+}
+
+static void batadv_v_ogm_emit(struct batadv_forw_packet *forw_packet)
+{
+}
+
+/**
+ * batadv_v_orig_print_neigh - print neighbors for the originator table
+ * @orig_node: the orig_node for which the neighbors are printed
+ * @if_outgoing: outgoing interface for these entries
+ * @seq: debugfs table seq_file struct
+ *
+ * Must be called while holding an rcu lock.
+ */
+static void
+batadv_v_orig_print_neigh(struct batadv_orig_node *orig_node,
+			  struct batadv_hard_iface *if_outgoing,
+			  struct seq_file *seq)
+{
+	struct batadv_neigh_node *neigh_node;
+	struct batadv_neigh_ifinfo *n_ifinfo;
+
+	hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
+		n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
+		if (!n_ifinfo)
+			continue;
+
+		seq_printf(seq, " %pM (%9u.%1u)",
+			   neigh_node->addr,
+			   n_ifinfo->bat_v.throughput / 10,
+			   n_ifinfo->bat_v.throughput % 10);
+
+		batadv_neigh_ifinfo_put(n_ifinfo);
+	}
+}
+
+/**
+ * batadv_v_hardif_neigh_print - print a single ELP neighbour node
+ * @seq: neighbour table seq_file struct
+ * @hardif_neigh: hardif neighbour information
+ */
+static void
+batadv_v_hardif_neigh_print(struct seq_file *seq,
+			    struct batadv_hardif_neigh_node *hardif_neigh)
+{
+	int last_secs, last_msecs;
+	u32 throughput;
+
+	last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
+	last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
+	throughput = ewma_throughput_read(&hardif_neigh->bat_v.throughput);
+
+	seq_printf(seq, "%pM %4i.%03is (%9u.%1u) [%10s]\n",
+		   hardif_neigh->addr, last_secs, last_msecs, throughput / 10,
+		   throughput % 10, hardif_neigh->if_incoming->net_dev->name);
+}
+
+/**
+ * batadv_v_neigh_print - print the single hop neighbour list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @seq: neighbour table seq_file struct
+ */
+static void batadv_v_neigh_print(struct batadv_priv *bat_priv,
+				 struct seq_file *seq)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct batadv_hardif_neigh_node *hardif_neigh;
+	struct batadv_hard_iface *hard_iface;
+	int batman_count = 0;
+
+	seq_printf(seq, "  %-15s %s (%11s) [%10s]\n", "Neighbor",
+		   "last-seen", "throughput", "IF");
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
+		if (hard_iface->soft_iface != net_dev)
+			continue;
+
+		hlist_for_each_entry_rcu(hardif_neigh,
+					 &hard_iface->neigh_list, list) {
+			batadv_v_hardif_neigh_print(seq, hardif_neigh);
+			batman_count++;
+		}
+	}
+	rcu_read_unlock();
+
+	if (batman_count == 0)
+		seq_puts(seq, "No batman nodes in range ...\n");
+}
+
+/**
+ * batadv_v_orig_print - print the originator table
+ * @bat_priv: the bat priv with all the soft interface information
+ * @seq: debugfs table seq_file struct
+ * @if_outgoing: the outgoing interface for which this should be printed
+ */
+static void batadv_v_orig_print(struct batadv_priv *bat_priv,
+				struct seq_file *seq,
+				struct batadv_hard_iface *if_outgoing)
+{
+	struct batadv_neigh_node *neigh_node;
+	struct batadv_hashtable *hash = bat_priv->orig_hash;
+	int last_seen_msecs, last_seen_secs;
+	struct batadv_orig_node *orig_node;
+	struct batadv_neigh_ifinfo *n_ifinfo;
+	unsigned long last_seen_jiffies;
+	struct hlist_head *head;
+	int batman_count = 0;
+	u32 i;
+
+	seq_printf(seq, "  %-15s %s (%11s) %17s [%10s]: %20s ...\n",
+		   "Originator", "last-seen", "throughput", "Nexthop",
+		   "outgoingIF", "Potential nexthops");
+
+	for (i = 0; i < hash->size; i++) {
+		head = &hash->table[i];
+
+		rcu_read_lock();
+		hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
+			neigh_node = batadv_orig_router_get(orig_node,
+							    if_outgoing);
+			if (!neigh_node)
+				continue;
+
+			n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
+							   if_outgoing);
+			if (!n_ifinfo)
+				goto next;
+
+			last_seen_jiffies = jiffies - orig_node->last_seen;
+			last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
+			last_seen_secs = last_seen_msecs / 1000;
+			last_seen_msecs = last_seen_msecs % 1000;
+
+			seq_printf(seq, "%pM %4i.%03is (%9u.%1u) %pM [%10s]:",
+				   orig_node->orig, last_seen_secs,
+				   last_seen_msecs,
+				   n_ifinfo->bat_v.throughput / 10,
+				   n_ifinfo->bat_v.throughput % 10,
+				   neigh_node->addr,
+				   neigh_node->if_incoming->net_dev->name);
+
+			batadv_v_orig_print_neigh(orig_node, if_outgoing, seq);
+			seq_puts(seq, "\n");
+			batman_count++;
+
+next:
+			batadv_neigh_node_put(neigh_node);
+			if (n_ifinfo)
+				batadv_neigh_ifinfo_put(n_ifinfo);
+		}
+		rcu_read_unlock();
+	}
+
+	if (batman_count == 0)
+		seq_puts(seq, "No batman nodes in range ...\n");
+}
+
+static int batadv_v_neigh_cmp(struct batadv_neigh_node *neigh1,
+			      struct batadv_hard_iface *if_outgoing1,
+			      struct batadv_neigh_node *neigh2,
+			      struct batadv_hard_iface *if_outgoing2)
+{
+	struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
+
+	ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
+	ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
+
+	if (WARN_ON(!ifinfo1 || !ifinfo2))
+		return 0;
+
+	return ifinfo1->bat_v.throughput - ifinfo2->bat_v.throughput;
+}
+
+static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
+				  struct batadv_hard_iface *if_outgoing1,
+				  struct batadv_neigh_node *neigh2,
+				  struct batadv_hard_iface *if_outgoing2)
+{
+	struct batadv_neigh_ifinfo *ifinfo1, *ifinfo2;
+	u32 threshold;
+
+	ifinfo1 = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
+	ifinfo2 = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
+
+	threshold = ifinfo1->bat_v.throughput / 4;
+	threshold = ifinfo1->bat_v.throughput - threshold;
+
+	return ifinfo2->bat_v.throughput > threshold;
+}
+
+static struct batadv_algo_ops batadv_batman_v __read_mostly = {
+	.name = "BATMAN_V",
+	.bat_iface_activate = batadv_v_iface_activate,
+	.bat_iface_enable = batadv_v_iface_enable,
+	.bat_iface_disable = batadv_v_iface_disable,
+	.bat_iface_update_mac = batadv_v_iface_update_mac,
+	.bat_primary_iface_set = batadv_v_primary_iface_set,
+	.bat_hardif_neigh_init = batadv_v_hardif_neigh_init,
+	.bat_ogm_emit = batadv_v_ogm_emit,
+	.bat_ogm_schedule = batadv_v_ogm_schedule,
+	.bat_orig_print = batadv_v_orig_print,
+	.bat_neigh_cmp = batadv_v_neigh_cmp,
+	.bat_neigh_is_similar_or_better = batadv_v_neigh_is_sob,
+	.bat_neigh_print = batadv_v_neigh_print,
+};
+
+/**
+ * batadv_v_mesh_init - initialize the B.A.T.M.A.N. V private resources for a
+ *  mesh
+ * @bat_priv: the object representing the mesh interface to initialise
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+int batadv_v_mesh_init(struct batadv_priv *bat_priv)
+{
+	return batadv_v_ogm_init(bat_priv);
+}
+
+/**
+ * batadv_v_mesh_free - free the B.A.T.M.A.N. V private resources for a mesh
+ * @bat_priv: the object representing the mesh interface to free
+ */
+void batadv_v_mesh_free(struct batadv_priv *bat_priv)
+{
+	batadv_v_ogm_free(bat_priv);
+}
+
+/**
+ * batadv_v_init - B.A.T.M.A.N. V initialization function
+ *
+ * Description: Takes care of initializing all the subcomponents.
+ * It is invoked upon module load only.
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+int __init batadv_v_init(void)
+{
+	int ret;
+
+	/* B.A.T.M.A.N. V echo location protocol packet  */
+	ret = batadv_recv_handler_register(BATADV_ELP,
+					   batadv_v_elp_packet_recv);
+	if (ret < 0)
+		return ret;
+
+	ret = batadv_recv_handler_register(BATADV_OGM2,
+					   batadv_v_ogm_packet_recv);
+	if (ret < 0)
+		goto elp_unregister;
+
+	ret = batadv_algo_register(&batadv_batman_v);
+	if (ret < 0)
+		goto ogm_unregister;
+
+	return ret;
+
+ogm_unregister:
+	batadv_recv_handler_unregister(BATADV_OGM2);
+
+elp_unregister:
+	batadv_recv_handler_unregister(BATADV_ELP);
+
+	return ret;
+}