@@ -231,6 +231,7 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
* @BATADV_DBG_BLA: bridge loop avoidance messages
* @BATADV_DBG_DAT: ARP snooping and DAT related messages
* @BATADV_DBG_NC: network coding related messages
+ * @BATADV_DBG_MCAST: multicast related messages
* @BATADV_DBG_ALL: the union of all the above log levels
*/
enum batadv_dbg_level {
@@ -240,7 +241,8 @@ enum batadv_dbg_level {
BATADV_DBG_BLA = BIT(3),
BATADV_DBG_DAT = BIT(4),
BATADV_DBG_NC = BIT(5),
- BATADV_DBG_ALL = 63,
+ BATADV_DBG_MCAST = BIT(6),
+ BATADV_DBG_ALL = 127,
};
#ifdef CONFIG_BATMAN_ADV_DEBUG
@@ -33,6 +33,7 @@
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
+#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
@@ -334,6 +335,122 @@ static bool batadv_mcast_has_bridge(struct batadv_priv *bat_priv)
}
/**
+ * batadv_mcast_querier_log - debug output regarding the querier status on link
+ * @bat_priv: the bat priv with all the soft interface information
+ * @str_proto: a string for the querier protocol (e.g. "IGMP" or "MLD")
+ * @old_state: the previous querier state on our link
+ * @new_state: the new querier state on our link
+ *
+ * Outputs debug messages to the logging facility with log level 'mcast'
+ * regarding changes to the querier status on the link which are relevant
+ * to our multicast optimizations.
+ *
+ * Usually this is about whether a querier appeared or vanished in
+ * our mesh or whether the querier is in the suboptimal position of being
+ * behind our local bridge segment: Snooping switches will directly
+ * forward listener reports to the querier, therefore batman-adv and
+ * the bridge will potentially not see these listeners - the querier is
+ * potentially shadowing listeners from us then.
+ *
+ * This is only interesting for nodes with a bridge on top of their
+ * soft interface.
+ */
+static void
+batadv_mcast_querier_log(struct batadv_priv *bat_priv, char *str_proto,
+ struct batadv_mcast_querier_state *old_state,
+ struct batadv_mcast_querier_state *new_state)
+{
+ if (!old_state->exists && new_state->exists)
+ batadv_info(bat_priv->soft_iface, "%s Querier appeared\n",
+ str_proto);
+ else if (old_state->exists && !new_state->exists)
+ batadv_info(bat_priv->soft_iface,
+ "%s Querier disappeared - multicast optimizations disabled\n",
+ str_proto);
+ else if (!bat_priv->mcast.bridged && !new_state->exists)
+ batadv_info(bat_priv->soft_iface,
+ "No %s Querier present - multicast optimizations disabled\n",
+ str_proto);
+
+ if (new_state->exists) {
+ if ((!old_state->shadowing && new_state->shadowing) ||
+ (!old_state->exists && new_state->shadowing))
+ batadv_dbg(BATADV_DBG_MCAST, bat_priv,
+ "%s Querier is behind our bridged segment: Might shadow listeners\n",
+ str_proto);
+ else if (old_state->shadowing && !new_state->shadowing)
+ batadv_dbg(BATADV_DBG_MCAST, bat_priv,
+ "%s Querier is not behind our bridged segment\n",
+ str_proto);
+ }
+}
+
+/**
+ * batadv_mcast_bridge_log - debug output for topology changes in bridged setups
+ * @bat_priv: the bat priv with all the soft interface information
+ * @bridged: a flag about whether the soft interface is currently bridged or not
+ * @querier_ipv4: (maybe) new status of a potential, selected IGMP querier
+ * @querier_ipv6: (maybe) new status of a potential, selected MLD querier
+ *
+ * If no bridges are ever used on this node, then this function does nothing.
+ *
+ * Otherwise this function outputs debug information to the 'mcast' log level
+ * which might be relevant to our multicast optimizations.
+ *
+ * More precisely, it outputs information when a bridge interface is added or
+ * removed from a soft interface. And when a bridge is present, it further
+ * outputs information about the querier state which is relevant for the
+ * multicast flags this node is going to set.
+ */
+static void
+batadv_mcast_bridge_log(struct batadv_priv *bat_priv, bool bridged,
+ struct batadv_mcast_querier_state *querier_ipv4,
+ struct batadv_mcast_querier_state *querier_ipv6)
+{
+ if (!bat_priv->mcast.bridged && bridged)
+ batadv_dbg(BATADV_DBG_MCAST, bat_priv,
+ "Bridge added: Setting Unsnoopables(U)-flag\n");
+ else if (bat_priv->mcast.bridged && !bridged)
+ batadv_dbg(BATADV_DBG_MCAST, bat_priv,
+ "Bridge removed: Unsetting Unsnoopables(U)-flag\n");
+
+ if (bridged) {
+ batadv_mcast_querier_log(bat_priv, "IGMP",
+ &bat_priv->mcast.querier_ipv4,
+ querier_ipv4);
+ batadv_mcast_querier_log(bat_priv, "MLD",
+ &bat_priv->mcast.querier_ipv6,
+ querier_ipv6);
+ }
+}
+
+/**
+ * batadv_mcast_flags_logs - output debug information about mcast flag changes
+ * @bat_priv: the bat priv with all the soft interface information
+ * @flags: flags indicating the new multicast state
+ *
+ * Whenever the multicast flags this nodes announces changes (@mcast_flags vs.
+ * bat_priv->mcast.flags), this notifies userspace via the 'mcast' log level.
+ */
+static void batadv_mcast_flags_log(struct batadv_priv *bat_priv, u8 flags)
+{
+ u8 old_flags = bat_priv->mcast.flags;
+ char str_old_flags[] = "[...]";
+
+ sprintf(str_old_flags, "[%c%c%c]",
+ (old_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
+ (old_flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
+ (old_flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
+
+ batadv_dbg(BATADV_DBG_MCAST, bat_priv,
+ "Changing multicast flags from '%s' to '[%c%c%c]'\n",
+ bat_priv->mcast.enabled ? str_old_flags : "<undefined>",
+ (flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES) ? 'U' : '.',
+ (flags & BATADV_MCAST_WANT_ALL_IPV4) ? '4' : '.',
+ (flags & BATADV_MCAST_WANT_ALL_IPV6) ? '6' : '.');
+}
+
+/**
* batadv_mcast_mla_tvlv_update - update multicast tvlv
* @bat_priv: the bat priv with all the soft interface information
*
@@ -349,12 +466,13 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
struct batadv_mcast_querier_state querier4 = {false, false};
struct batadv_mcast_querier_state querier6 = {false, false};
struct net_device *dev = bat_priv->soft_iface;
+ bool bridged;
mcast_data.flags = BATADV_NO_FLAGS;
memset(mcast_data.reserved, 0, sizeof(mcast_data.reserved));
- bat_priv->mcast.bridged = batadv_mcast_has_bridge(bat_priv);
- if (!bat_priv->mcast.bridged)
+ bridged = batadv_mcast_has_bridge(bat_priv);
+ if (!bridged)
goto update;
#if !IS_ENABLED(CONFIG_BRIDGE_IGMP_SNOOPING)
@@ -385,8 +503,19 @@ static bool batadv_mcast_mla_tvlv_update(struct batadv_priv *bat_priv)
mcast_data.flags |= BATADV_MCAST_WANT_ALL_IPV6;
update:
+ batadv_mcast_bridge_log(bat_priv, bridged, &querier4, &querier6);
+
+ bat_priv->mcast.querier_ipv4.exists = querier4.exists;
+ bat_priv->mcast.querier_ipv4.shadowing = querier4.shadowing;
+
+ bat_priv->mcast.querier_ipv6.exists = querier6.exists;
+ bat_priv->mcast.querier_ipv6.shadowing = querier6.shadowing;
+
+ bat_priv->mcast.bridged = bridged;
+
if (!bat_priv->mcast.enabled ||
mcast_data.flags != bat_priv->mcast.flags) {
+ batadv_mcast_flags_log(bat_priv, mcast_data.flags);
batadv_tvlv_container_register(bat_priv, BATADV_TVLV_MCAST, 2,
&mcast_data, sizeof(mcast_data));
bat_priv->mcast.flags = mcast_data.flags;
@@ -808,6 +808,10 @@ static int batadv_softif_init_late(struct net_device *dev)
atomic_set(&bat_priv->distributed_arp_table, 1);
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
+ bat_priv->mcast.querier_ipv4.exists = false;
+ bat_priv->mcast.querier_ipv4.shadowing = false;
+ bat_priv->mcast.querier_ipv6.exists = false;
+ bat_priv->mcast.querier_ipv6.shadowing = false;
bat_priv->mcast.flags = BATADV_NO_FLAGS;
atomic_set(&bat_priv->multicast_mode, 1);
atomic_set(&bat_priv->mcast.num_disabled, 0);
@@ -772,6 +772,8 @@ struct batadv_mcast_querier_state {
* multicast traffic
* @want_all_ipv4_list: a list of orig_nodes wanting all IPv4 multicast traffic
* @want_all_ipv6_list: a list of orig_nodes wanting all IPv6 multicast traffic
+ * @querier_ipv4: the current state of an IGMP querier in the mesh
+ * @querier_ipv6: the current state of an MLD querier in the mesh
* @flags: the flags we have last sent in our mcast tvlv
* @enabled: whether the multicast tvlv is currently enabled
* @bridged: whether the soft interface has a bridge on top
@@ -787,6 +789,8 @@ struct batadv_priv_mcast {
struct hlist_head want_all_unsnoopables_list;
struct hlist_head want_all_ipv4_list;
struct hlist_head want_all_ipv6_list;
+ struct batadv_mcast_querier_state querier_ipv4;
+ struct batadv_mcast_querier_state querier_ipv6;
u8 flags;
bool enabled;
bool bridged;