[B.A.T.M.A.N.] [PATCH 11/19] batman-adv: Output mcast forw table in debugfs

["Linus Lüssing" <linus.luessing@saxnet.de>]

With this commit the full multicast forwarding table, which is used for
determining whether to forward a multicast data packet or not, can now
be displayed via mcast_forw_table in BATMAN's debugfs directory.

Signed-off-by: Linus Lüssing <linus.luessing@saxnet.de>
---
 bat_debugfs.c |    9 ++++++
 multicast.c   |   82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 multicast.h   |    1 +
 3 files changed, 92 insertions(+), 0 deletions(-)

diff --git a/batman-adv/bat_debugfs.c b/batman-adv/bat_debugfs.c
index 0ae81d0..7b1b57d 100644
--- a/batman-adv/bat_debugfs.c
+++ b/batman-adv/bat_debugfs.c
@@ -32,6 +32,7 @@
 #include "soft-interface.h"
 #include "vis.h"
 #include "icmp_socket.h"
+#include "multicast.h"
 
 static struct dentry *bat_debugfs;
 
@@ -252,6 +253,12 @@ static int transtable_local_open(struct inode *inode, struct file *file)
 	return single_open(file, hna_local_seq_print_text, net_dev);
 }
 
+static int mcast_forw_table_open(struct inode *inode, struct file *file)
+{
+	struct net_device *net_dev = (struct net_device *)inode->i_private;
+	return single_open(file, mcast_forw_table_seq_print_text, net_dev);
+}
+
 static int vis_data_open(struct inode *inode, struct file *file)
 {
 	struct net_device *net_dev = (struct net_device *)inode->i_private;
@@ -280,6 +287,7 @@ static BAT_DEBUGINFO(gateways, S_IRUGO, gateways_open);
 static BAT_DEBUGINFO(softif_neigh, S_IRUGO, softif_neigh_open);
 static BAT_DEBUGINFO(transtable_global, S_IRUGO, transtable_global_open);
 static BAT_DEBUGINFO(transtable_local, S_IRUGO, transtable_local_open);
+static BAT_DEBUGINFO(mcast_forw_table, S_IRUGO, mcast_forw_table_open);
 static BAT_DEBUGINFO(vis_data, S_IRUGO, vis_data_open);
 
 static struct bat_debuginfo *mesh_debuginfos[] = {
@@ -288,6 +296,7 @@ static struct bat_debuginfo *mesh_debuginfos[] = {
 	&bat_debuginfo_softif_neigh,
 	&bat_debuginfo_transtable_global,
 	&bat_debuginfo_transtable_local,
+	&bat_debuginfo_mcast_forw_table,
 	&bat_debuginfo_vis_data,
 	NULL,
 };
diff --git a/batman-adv/multicast.c b/batman-adv/multicast.c
index bef3972..686e10b 100644
--- a/batman-adv/multicast.c
+++ b/batman-adv/multicast.c
@@ -158,6 +158,24 @@ void mcast_tracker_reset(struct bat_priv *bat_priv)
 	start_mcast_tracker(bat_priv);
 }
 
+static inline int get_remaining_timeout(
+				struct mcast_forw_nexthop_entry *nexthop_entry,
+				struct bat_priv *bat_priv)
+{
+	int tracker_timeout = atomic_read(&bat_priv->mcast_tracker_timeout);
+	if (!tracker_timeout)
+		tracker_timeout = atomic_read(&bat_priv->mcast_tracker_interval)
+				  * TRACKER_TIMEOUT_AUTO_X;
+	if (!tracker_timeout)
+		tracker_timeout = atomic_read(&bat_priv->orig_interval)
+				  * TRACKER_TIMEOUT_AUTO_X / 2;
+
+	tracker_timeout = jiffies_to_msecs(nexthop_entry->timeout) +
+			tracker_timeout - jiffies_to_msecs(jiffies);
+
+	return (tracker_timeout > 0 ? tracker_timeout : 0);
+}
+
 static void prepare_forw_if_entry(struct list_head *forw_if_list,
 				  int16_t if_num, uint8_t *neigh_addr)
 {
@@ -1002,6 +1020,70 @@ ok:
 	return count;
 }
 
+static inline struct batman_if *if_num_to_batman_if(int16_t if_num)
+{
+	struct batman_if *batman_if;
+
+	list_for_each_entry_rcu(batman_if, &if_list, list)
+		if (batman_if->if_num == if_num)
+			return batman_if;
+
+	return NULL;
+}
+
+int mcast_forw_table_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct net_device *net_dev = (struct net_device *)seq->private;
+	struct bat_priv *bat_priv = netdev_priv(net_dev);
+	struct batman_if *batman_if;
+	struct mcast_forw_table_entry *table_entry;
+	struct mcast_forw_orig_entry *orig_entry;
+	struct mcast_forw_if_entry *if_entry;
+	struct mcast_forw_nexthop_entry *nexthop_entry;
+
+	seq_printf(seq, "[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
+		   SOURCE_VERSION, REVISION_VERSION_STR,
+		   bat_priv->primary_if->net_dev->name,
+		   bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
+	seq_printf(seq, "Multicast group MAC\tOriginator\t"
+			"Outgoing interface\tNexthop - timeout in msecs\n");
+
+	rcu_read_lock();
+	spin_lock_bh(&bat_priv->mcast_forw_table_lock);
+	list_for_each_entry(table_entry, &bat_priv->mcast_forw_table, list) {
+		seq_printf(seq, "%pM\n", table_entry->mcast_addr);
+
+		list_for_each_entry(orig_entry, &table_entry->mcast_orig_list,
+				    list) {
+			seq_printf(seq, "\t%pM\n", orig_entry->orig);
+
+			list_for_each_entry(if_entry,
+					    &orig_entry->mcast_if_list, list) {
+				batman_if =
+					if_num_to_batman_if(if_entry->if_num);
+				if (!batman_if)
+					continue;
+
+				seq_printf(seq, "\t\t%s\n",
+					   batman_if->net_dev->name);
+
+				list_for_each_entry(nexthop_entry,
+						&if_entry->mcast_nexthop_list,
+						list) {
+					seq_printf(seq, "\t\t\t%pM - %i\n",
+						   nexthop_entry->neigh_addr,
+						   get_remaining_timeout(
+						     nexthop_entry, bat_priv));
+				}
+			}
+		}
+	}
+	spin_unlock_bh(&bat_priv->mcast_forw_table_lock);
+	rcu_read_unlock();
+
+	return 0;
+}
+
 int mcast_init(struct bat_priv *bat_priv)
 {
 	INIT_DELAYED_WORK(&bat_priv->mcast_tracker_work, mcast_tracker_timer);
diff --git a/batman-adv/multicast.h b/batman-adv/multicast.h
index 2711d8b..0bd0590 100644
--- a/batman-adv/multicast.h
+++ b/batman-adv/multicast.h
@@ -30,6 +30,7 @@ void mcast_tracker_reset(struct bat_priv *bat_priv);
 void route_mcast_tracker_packet(
 			struct mcast_tracker_packet *tracker_packet,
 			int tracker_packet_len, struct bat_priv *bat_priv);
+int mcast_forw_table_seq_print_text(struct seq_file *seq, void *offset);
 int mcast_init(struct bat_priv *bat_priv);
 void mcast_free(struct bat_priv *bat_priv);
 
-- 
1.7.2.3