batman-adv: Add debugfs table for mcast flags

This patch adds a debugfs table with originators and their according
multicast flags to help users figure out why multicast optimizations
might be enabled or disabled for them.

Tested-by: Simon Wunderlich <sw@simonwunderlich.de>
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c
index 9529004..f187a8f 100644 (file)
--- a/net/batman-adv/debugfs.c
+++ b/net/batman-adv/debugfs.c
@@ -48,6 +48,7 @@
 #include "distributed-arp-table.h"
 #include "gateway_client.h"
 #include "icmp_socket.h"
+#include "multicast.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "translation-table.h"
@@ -363,6 +364,22 @@ static int batadv_nc_nodes_open(struct inode *inode, struct file *file)
 }
 #endif
 
+#ifdef CONFIG_BATMAN_ADV_MCAST
+/**
+ * batadv_mcast_flags_open - prepare file handler for reads from mcast_flags
+ * @inode: inode which was opened
+ * @file: file handle to be initialized
+ *
+ * Return: 0 on success or negative error number in case of failure
+ */
+static int batadv_mcast_flags_open(struct inode *inode, struct file *file)
+{
+       struct net_device *net_dev = (struct net_device *)inode->i_private;
+
+       return single_open(file, batadv_mcast_flags_seq_print_text, net_dev);
+}
+#endif
+
 #define BATADV_DEBUGINFO(_name, _mode, _open)          \
 struct batadv_debuginfo batadv_debuginfo_##_name = {   \
        .attr = {                                       \
@@ -407,6 +424,9 @@ static BATADV_DEBUGINFO(transtable_local, S_IRUGO,
 #ifdef CONFIG_BATMAN_ADV_NC
 static BATADV_DEBUGINFO(nc_nodes, S_IRUGO, batadv_nc_nodes_open);
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+static BATADV_DEBUGINFO(mcast_flags, S_IRUGO, batadv_mcast_flags_open);
+#endif
 
 static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
        &batadv_debuginfo_neighbors,
@@ -423,6 +443,9 @@ static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
        &batadv_debuginfo_transtable_local,
 #ifdef CONFIG_BATMAN_ADV_NC
        &batadv_debuginfo_nc_nodes,
+#endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+       &batadv_debuginfo_mcast_flags,
 #endif
        NULL,
 };

diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index 2d1a896..d3222db 100644 (file)
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -41,6 +41,7 @@
 #include <linux/printk.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
+#include <linux/seq_file.h>
 #include <linux/skbuff.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
@@ -52,6 +53,8 @@
 #include <net/ip.h>
 #include <net/ipv6.h>
 
+#include "hard-interface.h"
+#include "hash.h"
 #include "packet.h"
 #include "translation-table.h"
 
@@ -1129,6 +1132,107 @@ void batadv_mcast_init(struct batadv_priv *bat_priv)
                                     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 }
 
+/**
+ * batadv_mcast_flags_print_header - print own mcast flags to debugfs table
+ * @bat_priv: the bat priv with all the soft interface information
+ * @seq: debugfs table seq_file struct
+ *
+ * Prints our own multicast flags including a more specific reason why
+ * they are set, that is prints the bridge and querier state too, to
+ * the debugfs table specified via @seq.
+ */
+static void batadv_mcast_flags_print_header(struct batadv_priv *bat_priv,
+                                           struct seq_file *seq)
+{
+       u8 flags = bat_priv->mcast.flags;
+       char querier4, querier6, shadowing4, shadowing6;
+       bool bridged = bat_priv->mcast.bridged;
+
+       if (bridged) {
+               querier4 = bat_priv->mcast.querier_ipv4.exists ? '.' : '4';
+               querier6 = bat_priv->mcast.querier_ipv6.exists ? '.' : '6';
+               shadowing4 = bat_priv->mcast.querier_ipv4.shadowing ? '4' : '.';
+               shadowing6 = bat_priv->mcast.querier_ipv6.shadowing ? '6' : '.';
+       } else {
+               querier4 = '?';
+               querier6 = '?';
+               shadowing4 = '?';
+               shadowing6 = '?';
+       }
+
+       seq_printf(seq, "Multicast flags (own flags: [%c%c%c])\n",
+                  (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
+                  (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
+                  (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
+       seq_printf(seq, "* Bridged [U]\t\t\t\t%c\n", bridged ? 'U' : '.');
+       seq_printf(seq, "* No IGMP/MLD Querier [4/6]:\t\t%c/%c\n",
+                  querier4, querier6);
+       seq_printf(seq, "* Shadowing IGMP/MLD Querier [4/6]:\t%c/%c\n",
+                  shadowing4, shadowing6);
+       seq_puts(seq, "-------------------------------------------\n");
+       seq_printf(seq, "       %-10s %s\n", "Originator", "Flags");
+}
+
+/**
+ * batadv_mcast_flags_seq_print_text - print the mcast flags of other nodes
+ * @seq: seq file to print on
+ * @offset: not used
+ *
+ * This prints a table of (primary) originators and their according
+ * multicast flags, including (in the header) our own.
+ *
+ * Return: always 0
+ */
+int batadv_mcast_flags_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;
+       struct batadv_hashtable *hash = bat_priv->orig_hash;
+       struct batadv_orig_node *orig_node;
+       struct hlist_head *head;
+       u8 flags;
+       u32 i;
+
+       primary_if = batadv_seq_print_text_primary_if_get(seq);
+       if (!primary_if)
+               return 0;
+
+       batadv_mcast_flags_print_header(bat_priv, seq);
+
+       for (i = 0; i < hash->size; i++) {
+               head = &hash->table[i];
+
+               rcu_read_lock();
+               hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
+                       if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
+                                     &orig_node->capa_initialized))
+                               continue;
+
+                       if (!test_bit(BATADV_ORIG_CAPA_HAS_MCAST,
+                                     &orig_node->capabilities)) {
+                               seq_printf(seq, "%pM -\n", orig_node->orig);
+                               continue;
+                       }
+
+                       flags = orig_node->mcast_flags;
+
+                       seq_printf(seq, "%pM [%c%c%c]\n", orig_node->orig,
+                                  (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES)
+                                  ? 'U' : '.',
+                                  (flags & BATADV_MCAST_WANT_ALL_IPV4)
+                                  ? '4' : '.',
+                                  (flags & BATADV_MCAST_WANT_ALL_IPV6)
+                                  ? '6' : '.');
+               }
+               rcu_read_unlock();
+       }
+
+       batadv_hardif_put(primary_if);
+
+       return 0;
+}
+
 /**
  * batadv_mcast_free - free the multicast optimizations structures
  * @bat_priv: the bat priv with all the soft interface information

diff --git a/net/batman-adv/multicast.h b/net/batman-adv/multicast.h
index 80bceec..1fb00ba 100644 (file)
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -20,6 +20,7 @@
 
 #include "main.h"
 
+struct seq_file;
 struct sk_buff;
 
 /**
@@ -46,6 +47,8 @@ batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
 
 void batadv_mcast_init(struct batadv_priv *bat_priv);
 
+int batadv_mcast_flags_seq_print_text(struct seq_file *seq, void *offset);
+
 void batadv_mcast_free(struct batadv_priv *bat_priv);
 
 void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);