batman-adv: export single hop neighbor list via debugfs

Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Antonio Quartulli <antonio@meshcoding.com>

net/batman-adv/bat_iv_ogm.c

@@ -1861,6 +1861,58 @@ next:
 		seq_puts(seq, "No batman nodes in range ...\n");
 }
 
+/**
+ * batadv_iv_hardif_neigh_print - print a single hop neighbour node
+ * @seq: neighbour table seq_file struct
+ * @hardif_neigh: hardif neighbour information
+ */
+static void
+batadv_iv_hardif_neigh_print(struct seq_file *seq,
+			     struct batadv_hardif_neigh_node *hardif_neigh)
+{
+	int last_secs, last_msecs;
+
+	last_secs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) / 1000;
+	last_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen) % 1000;
+
+	seq_printf(seq, "   %10s   %pM %4i.%03is\n",
+		   hardif_neigh->if_incoming->net_dev->name,
+		   hardif_neigh->addr, last_secs, last_msecs);
+}
+
+/**
+ * batadv_iv_ogm_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_iv_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, "   %10s        %-13s %s\n",
+		   "IF", "Neighbor", "last-seen");
+
+	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_iv_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_iv_ogm_neigh_cmp - compare the metrics of two neighbors
  * @neigh1: the first neighbor object of the comparison
@@ -1954,6 +2006,7 @@ static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
 	.bat_ogm_emit = batadv_iv_ogm_emit,
 	.bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
 	.bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
+	.bat_neigh_print = batadv_iv_neigh_print,
 	.bat_orig_print = batadv_iv_ogm_orig_print,
 	.bat_orig_free = batadv_iv_ogm_orig_free,
 	.bat_orig_add_if = batadv_iv_ogm_orig_add_if,

net/batman-adv/debugfs.c

@@ -262,6 +262,13 @@ static int batadv_algorithms_open(struct inode *inode, struct file *file)
 	return single_open(file, batadv_algo_seq_print_text, NULL);
 }
 
+static int neighbors_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+
+	return single_open(file, batadv_hardif_neigh_seq_print_text, net_dev);
+}
+
 static int batadv_originators_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;
@@ -375,6 +382,7 @@ static struct batadv_debuginfo *batadv_general_debuginfos[] = {
 };
 
 /* The following attributes are per soft interface */
+static BATADV_DEBUGINFO(neighbors, S_IRUGO, neighbors_open);
 static BATADV_DEBUGINFO(originators, S_IRUGO, batadv_originators_open);
 static BATADV_DEBUGINFO(gateways, S_IRUGO, batadv_gateways_open);
 static BATADV_DEBUGINFO(transtable_global, S_IRUGO,
@@ -394,6 +402,7 @@ static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
 #endif
 
 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
+	&batadv_debuginfo_neighbors,
 	&batadv_debuginfo_originators,
 	&batadv_debuginfo_gateways,
 	&batadv_debuginfo_transtable_global,

net/batman-adv/originator.c

@@ -692,6 +692,40 @@ out:
 	return neigh_node;
 }
 
+/**
+ * batadv_hardif_neigh_seq_print_text - print the single hop neighbour list
+ * @seq: neighbour table seq_file struct
+ * @offset: not used
+ *
+ * Always returns 0.
+ */
+int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct batadv_priv *bat_priv = netdev_priv(net_dev);
+	struct batadv_hard_iface *primary_if;
+
+	primary_if = batadv_seq_print_text_primary_if_get(seq);
+	if (!primary_if)
+		return 0;
+
+	seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
+		   BATADV_SOURCE_VERSION, primary_if->net_dev->name,
+		   primary_if->net_dev->dev_addr, net_dev->name,
+		   bat_priv->bat_algo_ops->name);
+
+	batadv_hardif_free_ref(primary_if);
+
+	if (!bat_priv->bat_algo_ops->bat_neigh_print) {
+		seq_puts(seq,
+			 "No printing function for this routing protocol\n");
+		return 0;
+	}
+
+	bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq);
+	return 0;
+}
+
 /**
  * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object
  * @rcu: rcu pointer of the orig_ifinfo object

net/batman-adv/originator.h

@@ -62,6 +62,8 @@ batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh,
 			struct batadv_hard_iface *if_outgoing);
 void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo);
 
+int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset);
+
 struct batadv_orig_ifinfo *
 batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node,
 		       struct batadv_hard_iface *if_outgoing);

net/batman-adv/types.h

@@ -1159,6 +1159,7 @@ struct batadv_forw_packet {
  * @bat_neigh_is_equiv_or_better: check if neigh1 is equally good or better
  *  than neigh2 for their respective outgoing interface from the metric
  *  prospective
+ * @bat_neigh_print: print the single hop neighbor list (optional)
  * @bat_neigh_free: free the resources allocated by the routing algorithm for a
  *  neigh_node object
  * @bat_orig_print: print the originator table (optional)
@@ -1189,6 +1190,7 @@ struct batadv_algo_ops {
 		 struct batadv_hard_iface *if_outgoing1,
 		 struct batadv_neigh_node *neigh2,
 		 struct batadv_hard_iface *if_outgoing2);
+	void (*bat_neigh_print)(struct batadv_priv *priv, struct seq_file *seq);
 	void (*bat_neigh_free)(struct batadv_neigh_node *neigh);
 	/* orig_node handling API */
 	void (*bat_orig_print)(struct batadv_priv *priv, struct seq_file *seq,