[B.A.T.M.A.N.] [PATCHv12 4/4] batman-adv: Add debugfs table for mcast flags

Linus Lüssing
2016-03-16T04:06:45Z

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.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
---
net/batman-adv/debugfs.c | 21 +++++++++
net/batman-adv/multicast.c | 101 ++++++++++++++++++++++++++++++++++++++++++++
net/batman-adv/multicast.h | 2 +
3 files changed, 124 insertions(+)

diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c
index 3dc5208..2cbff01 100644
--- 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 +364,20 @@ 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
+ */
+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 = { .name = __stringify(_name), \
@@ -404,6 +419,9 @@ 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,
@@ -421,6 +439,9 @@ static struct batadv_debuginfo *batadv_mesh_debuginfos[] = {
#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 41ba2e8..f68903f 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -50,6 +50,8 @@
#include <net/ipv6.h>
#include <net/mld.h>

+#include "hard-interface.h"
+#include "hash.h"
#include "packet.h"
#include "translation-table.h"

@@ -1169,6 +1171,105 @@ void batadv_mcast_init(struct batadv_priv *bat_priv)
}

/**
+ * 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.
+ */
+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 (!(orig_node->capa_initialized &
+ BATADV_ORIG_CAPA_HAS_MCAST))
+ continue;
+
+ flags = orig_node->mcast_flags;
+
+ if (!(orig_node->capabilities &
+ BATADV_ORIG_CAPA_HAS_MCAST)) {
+ seq_printf(seq, "%pM -\n", orig_node->orig);
+ continue;
+ }
+
+ 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..df744c6 100644
--- a/net/batman-adv/multicast.h
+++ b/net/batman-adv/multicast.h
@@ -46,6 +46,8 @@ 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);
--
1.7.10.4