Basic Multicast Optimizations

index 12bc8d8..7a3d235 100644
@@ -103,6 +103,24 @@ static inline struct sk_buff *netdev_alloc_skb_ip_align(struct net_device *dev,
 
 #define pr_warn pr_warning
 
+#undef  netdev_for_each_mc_addr
+#define netdev_for_each_mc_addr(mclist, dev) \
+	for (mclist = (struct batadv_dev_addr_list *)dev->mc_list; mclist; \
+	     mclist = (struct batadv_dev_addr_list *)mclist->next)
+
+/* Note, that this breaks the usage of the normal 'struct netdev_hw_addr'
+ * for kernels < 2.6.35 in batman-adv!
+ */
+#define netdev_hw_addr batadv_dev_addr_list
+struct batadv_dev_addr_list {
+	struct dev_addr_list *next;
+	u8  addr[MAX_ADDR_LEN];
+	u8  da_addrlen;
+	u8  da_synced;
+	int da_users;
+	int da_gusers;
+};
+
 #endif /* < KERNEL_VERSION(2, 6, 35) */
 
 

@@ -143,6 +161,14 @@ static inline int batadv_param_set_copystring(const char *val,
 #define addr_assign_type ifindex
 #define NET_ADDR_RANDOM 0
 
+#define netdev_master_upper_dev_get_rcu(dev) \
+	NULL; \
+	if (dev->br_port ? 1 : 0) { \
+		rcu_read_unlock(); \
+		dev_hold(dev); \
+		return dev; \
+	}
+
 #endif /* < KERNEL_VERSION(2, 6, 36) */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)

@@ -343,6 +369,17 @@ static int __batadv_interface_tx(struct sk_buff *skb, \
 	pos && ({ n = pos->member.next; 1; }); \
 	pos = hlist_entry_safe(n, typeof(*pos), member))
 
+#ifndef netdev_master_upper_dev_get_rcu
+#define netdev_master_upper_dev_get_rcu(dev) \
+	NULL; \
+	if (dev->priv_flags & IFF_BRIDGE_PORT) { \
+		rcu_read_unlock(); \
+		dev_hold(dev); \
+		return dev; \
+	}
+
+#endif /* netdev_master_upper_dev_get_rcu */
+
 #endif /* < KERNEL_VERSION(3, 9, 0) */
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)

index fbeaebd..58e98c8 100644
@@ -34,6 +34,7 @@
 #include "gateway_client.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
+#include "multicast.h"
 #include "gateway_common.h"
 #include "hash.h"
 #include "bat_algo.h"

@@ -120,6 +121,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
 	INIT_LIST_HEAD(&bat_priv->tt.req_list);
 	INIT_LIST_HEAD(&bat_priv->tt.roam_list);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	INIT_HLIST_HEAD(&bat_priv->mcast.mla_list);
+#endif
 	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
 	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
 	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);

@@ -169,6 +173,8 @@ void batadv_mesh_free(struct net_device *soft_iface)
 	batadv_dat_free(bat_priv);
 	batadv_bla_free(bat_priv);
 
+	batadv_mcast_free(bat_priv);
+
 	/* Free the TT and the originator tables only after having terminated
 	 * all the other depending components which may use these structures for
 	 * their purposes.

index 34e85a2..dc6b4a2 100644
@@ -176,6 +176,7 @@ enum batadv_uev_type {
 #include <linux/percpu.h>
 #include <linux/slab.h>
 #include <net/sock.h>		/* struct sock */
+#include <net/addrconf.h>	/* ipv6 address stuff */
 #include <net/rtnetlink.h>
 #include <linux/jiffies.h>
 #include <linux/seq_file.h>

242 lines not on this page · raw message

new file mode 100644
index 0000000..111aad7
@@ -0,0 +1,38 @@
+/* Copyright (C) 2014 B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _NET_BATMAN_ADV_MULTICAST_H_
+#define _NET_BATMAN_ADV_MULTICAST_H_
+
+#ifdef CONFIG_BATMAN_ADV_MCAST
+
+void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
+
+void batadv_mcast_free(struct batadv_priv *bat_priv);
+
+#else
+
+static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
+{
+	return;
+}
+
+#endif /* CONFIG_BATMAN_ADV_MCAST */
+
+#endif /* _NET_BATMAN_ADV_MULTICAST_H_ */

index 6d0da58..4082d05 100644
@@ -24,6 +24,7 @@
 #include "originator.h"
 #include "routing.h"
 #include "bridge_loop_avoidance.h"
+#include "multicast.h"
 
 #include <linux/crc32c.h>
 

@@ -484,7 +485,7 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 {
 	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 	struct batadv_tt_local_entry *tt_local;
-	struct batadv_tt_global_entry *tt_global;
+	struct batadv_tt_global_entry *tt_global = NULL;
 	struct net_device *in_dev = NULL;
 	struct hlist_head *head;
 	struct batadv_tt_orig_list_entry *orig_entry;

@@ -497,7 +498,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 		in_dev = dev_get_by_index(&init_net, ifindex);
 
 	tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
-	tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
+
+	if (!is_multicast_ether_addr(addr))
+		tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 
 	if (tt_local) {
 		tt_local->last_seen = jiffies;

@@ -562,8 +565,11 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 	tt_local->last_seen = jiffies;
 	tt_local->common.added_at = tt_local->last_seen;
 
-	/* the batman interface mac address should never be purged */
-	if (batadv_compare_eth(addr, soft_iface->dev_addr))
+	/* the batman interface mac and multicast addresses should never be
+	 * purged
+	 */
+	if (batadv_compare_eth(addr, soft_iface->dev_addr) ||
+	    is_multicast_ether_addr(addr))
 		tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 
 	hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,

@@ -1361,6 +1367,11 @@ add_orig_entry:
 	ret = true;
 
 out_remove:
+	/* Do not remove multicast addresses from the local hash on
+	 * global additions
+	 */
+	if (is_multicast_ether_addr(tt_addr))
+		goto out;
 
 	/* remove address from local hash if present */
 	local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,

@@ -3120,6 +3131,9 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
  */
 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
 {
+	/* Update multicast addresses in local translation table */
+	batadv_mcast_mla_update(bat_priv);
+
 	if (atomic_read(&bat_priv->tt.local_changes) < 1) {
 		if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
 			batadv_tt_tvlv_container_update(bat_priv);

index 9f52517..d553264 100644
@@ -607,6 +607,16 @@ struct batadv_priv_dat {
 };
 #endif
 
+#ifdef CONFIG_BATMAN_ADV_MCAST
+/**
+ * struct batadv_priv_mcast - per mesh interface mcast data
+ * @mla_list: list of multicast addresses we are currently announcing via TT
+ */
+struct batadv_priv_mcast {
+	struct hlist_head mla_list;
+};
+#endif
+
 /**
  * struct batadv_priv_nc - per mesh interface network coding private data
  * @work: work queue callback item for cleanup

@@ -702,6 +712,7 @@ struct batadv_softif_vlan {
  * @tt: translation table data
  * @tvlv: type-version-length-value data
  * @dat: distributed arp table data
+ * @mcast: multicast data
  * @network_coding: bool indicating whether network coding is enabled
  * @batadv_priv_nc: network coding data
  */

@@ -759,6 +770,9 @@ struct batadv_priv {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	struct batadv_priv_dat dat;
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	struct batadv_priv_mcast mcast;
+#endif
 #ifdef CONFIG_BATMAN_ADV_NC
 	atomic_t network_coding;
 	struct batadv_priv_nc nc;

@@ -1116,6 +1130,16 @@ struct batadv_dat_entry {
 };
 
 /**
+ * struct batadv_hw_addr - a list entry for a MAC address
+ * @list: list node for the linking of entries
+ * @addr: the MAC address of this list entry
+ */
+struct batadv_hw_addr {
+	struct hlist_node list;
+	unsigned char addr[ETH_ALEN];
+};
+
+/**
  * struct batadv_dat_candidate - candidate destination for DAT operations
  * @type: the type of the selected candidate. It can one of the following:
  *	  - BATADV_DAT_CANDIDATE_NOT_FOUND

index 9f2da37..24a9300 100644
@@ -664,7 +664,6 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 	/* extra reference for return */
 	atomic_set(&orig_node->refcount, 2);
 
-	orig_node->tt_initialised = false;
 	orig_node->bat_priv = bat_priv;
 	ether_addr_copy(orig_node->orig, addr);
 	batadv_dat_init_orig_node_addr(orig_node);

index 4082d05..f641dfe 100644
@@ -1774,7 +1774,7 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 		}
 		spin_unlock_bh(list_lock);
 	}
-	orig_node->tt_initialised = false;
+	orig_node->capa_initialized &= ~BATADV_ORIG_CAPA_HAS_TT;
 }
 
 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,

@@ -2734,7 +2734,7 @@ static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
 				return;
 		}
 	}
-	orig_node->tt_initialised = true;
+	orig_node->capa_initialized |= BATADV_ORIG_CAPA_HAS_TT;
 }
 
 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,

@@ -3224,13 +3224,15 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 	uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
 	struct batadv_tvlv_tt_vlan_data *tt_vlan;
 	bool full_table = true;
+	bool has_tt_init;
 
 	tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
+	has_tt_init = orig_node->capa_initialized & BATADV_ORIG_CAPA_HAS_TT;
+
 	/* orig table not initialised AND first diff is in the OGM OR the ttvn
 	 * increased by one -> we can apply the attached changes
 	 */
-	if ((!orig_node->tt_initialised && ttvn == 1) ||
-	    ttvn - orig_ttvn == 1) {
+	if ((!has_tt_init && ttvn == 1) || ttvn - orig_ttvn == 1) {
 		/* the OGM could not contain the changes due to their size or
 		 * because they have already been sent BATADV_TT_OGM_APPEND_MAX
 		 * times.

@@ -3270,7 +3272,7 @@ static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
 		/* if we missed more than one change or our tables are not
 		 * in sync anymore -> request fresh tt data
 		 */
-		if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
+		if (!has_tt_init || ttvn != orig_ttvn ||
 		    !batadv_tt_global_check_crc(orig_node, tt_vlan,
 						tt_num_vlan)) {
 request_table:

index d553264..b46117c 100644
@@ -205,13 +205,12 @@ struct batadv_orig_bat_iv {
  * @last_seen: time when last packet from this node was received
  * @bcast_seqno_reset: time when the broadcast seqno window was reset
  * @capabilities: announced capabilities of this originator
+ * @capa_initialized: bitfield to remember whether a capability was initialized
  * @last_ttvn: last seen translation table version number
  * @tt_buff: last tt changeset this node received from the orig node
  * @tt_buff_len: length of the last tt changeset this node received from the
  *  orig node
  * @tt_buff_lock: lock that protects tt_buff and tt_buff_len
- * @tt_initialised: bool keeping track of whether or not this node have received
- *  any translation table information from the orig node yet
  * @tt_lock: prevents from updating the table while reading it. Table update is
  *  made up by two operations (data structure update and metdata -CRC/TTVN-
  *  recalculation) and they have to be executed atomically in order to avoid

@@ -248,11 +247,11 @@ struct batadv_orig_node {
 	unsigned long last_seen;
 	unsigned long bcast_seqno_reset;
 	uint8_t capabilities;
+	uint8_t capa_initialized;
 	atomic_t last_ttvn;
 	unsigned char *tt_buff;
 	int16_t tt_buff_len;
 	spinlock_t tt_buff_lock; /* protects tt_buff & tt_buff_len */
-	bool tt_initialised;
 	/* prevents from changing the table while reading it */
 	spinlock_t tt_lock;
 	DECLARE_BITMAP(bcast_bits, BATADV_TQ_LOCAL_WINDOW_SIZE);

@@ -282,10 +281,12 @@ struct batadv_orig_node {
  * enum batadv_orig_capabilities - orig node capabilities
  * @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table enabled
  * @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled
+ * @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability
  */
 enum batadv_orig_capabilities {
 	BATADV_ORIG_CAPA_HAS_DAT = BIT(0),
 	BATADV_ORIG_CAPA_HAS_NC = BIT(1),
+	BATADV_ORIG_CAPA_HAS_TT = BIT(2),
 };
 
 /**

index 58e98c8..8f11b67 100644
@@ -149,6 +149,7 @@ int batadv_mesh_init(struct net_device *soft_iface)
 		goto err;
 
 	batadv_gw_init(bat_priv);
+	batadv_mcast_init(bat_priv);
 
 	atomic_set(&bat_priv->gw.reselect, 0);
 	atomic_set(&bat_priv->mesh_state, BATADV_MESH_ACTIVE);

147 lines not on this page · raw message

index 111aad7..d736335 100644
@@ -19,8 +19,12 @@
 
 void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
 
+void batadv_mcast_init(struct batadv_priv *bat_priv);
+
 void batadv_mcast_free(struct batadv_priv *bat_priv);
 
+void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node);
+
 #else
 
 static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)

@@ -28,11 +32,21 @@ static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
 	return;
 }
 
+static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
 static inline void batadv_mcast_free(struct batadv_priv *bat_priv)
 {
 	return;
 }
 
+static inline void batadv_mcast_purge_orig(struct batadv_orig_node *orig_node)
+{
+	return;
+}
+
 #endif /* CONFIG_BATMAN_ADV_MCAST */
 
 #endif /* _NET_BATMAN_ADV_MULTICAST_H_ */

index 24a9300..ffd9dfb 100644
@@ -27,6 +27,7 @@
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 #include "fragmentation.h"
+#include "multicast.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_orig_hash_lock_class_key;

@@ -557,6 +558,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 	}
 	spin_unlock_bh(&orig_node->neigh_list_lock);
 
+	batadv_mcast_purge_orig(orig_node);
+
 	/* Free nc_nodes */
 	batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL);
 

@@ -672,6 +675,9 @@ struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv,
 	orig_node->tt_buff_len = 0;
 	reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS);
 	orig_node->bcast_seqno_reset = reset_time;
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	orig_node->mcast_flags = BATADV_NO_FLAGS;
+#endif
 
 	/* create a vlan object for the "untagged" LAN */
 	vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS);

index 0a381d1..e8c483d 100644
@@ -145,6 +145,7 @@ enum batadv_bla_claimframe {
  * @BATADV_TVLV_NC: network coding tvlv
  * @BATADV_TVLV_TT: translation table tvlv
  * @BATADV_TVLV_ROAM: roaming advertisement tvlv
+ * @BATADV_TVLV_MCAST: multicast capability tvlv
  */
 enum batadv_tvlv_type {
 	BATADV_TVLV_GW		= 0x01,

@@ -152,6 +153,7 @@ enum batadv_tvlv_type {
 	BATADV_TVLV_NC		= 0x03,
 	BATADV_TVLV_TT		= 0x04,
 	BATADV_TVLV_ROAM	= 0x05,
+	BATADV_TVLV_MCAST	= 0x06,
 };
 
 #pragma pack(2)

@@ -504,4 +506,14 @@ struct batadv_tvlv_roam_adv {
 	__be16 vid;
 };
 
+/**
+ * struct batadv_tvlv_mcast_data - payload of a multicast tvlv
+ * @flags: multicast flags announced by the orig node
+ * @reserved: reserved field
+ */
+struct batadv_tvlv_mcast_data {
+	uint8_t	flags;
+	uint8_t reserved[3];
+};
+
 #endif /* _NET_BATMAN_ADV_PACKET_H_ */

index 633e9d6..8ff47b7 100644
@@ -689,6 +689,10 @@ static int batadv_softif_init_late(struct net_device *dev)
 #ifdef CONFIG_BATMAN_ADV_DAT
 	atomic_set(&bat_priv->distributed_arp_table, 1);
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	bat_priv->mcast.flags = BATADV_NO_FLAGS;
+	atomic_set(&bat_priv->mcast.num_disabled, 0);
+#endif
 	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 	atomic_set(&bat_priv->gw_sel_class, 20);
 	atomic_set(&bat_priv->gw.bandwidth_down, 100);

index b46117c..96ee0d2 100644
@@ -204,6 +204,7 @@ struct batadv_orig_bat_iv {
  * @batadv_dat_addr_t:  address of the orig node in the distributed hash
  * @last_seen: time when last packet from this node was received
  * @bcast_seqno_reset: time when the broadcast seqno window was reset
+ * @mcast_flags: multicast flags announced by the orig node
  * @capabilities: announced capabilities of this originator
  * @capa_initialized: bitfield to remember whether a capability was initialized
  * @last_ttvn: last seen translation table version number

@@ -246,6 +247,9 @@ struct batadv_orig_node {
 #endif
 	unsigned long last_seen;
 	unsigned long bcast_seqno_reset;
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	uint8_t mcast_flags;
+#endif
 	uint8_t capabilities;
 	uint8_t capa_initialized;
 	atomic_t last_ttvn;

@@ -282,11 +286,14 @@ struct batadv_orig_node {
  * @BATADV_ORIG_CAPA_HAS_DAT: orig node has distributed arp table enabled
  * @BATADV_ORIG_CAPA_HAS_NC: orig node has network coding enabled
  * @BATADV_ORIG_CAPA_HAS_TT: orig node has tt capability
+ * @BATADV_ORIG_CAPA_HAS_MCAST: orig node has some multicast capability
+ *  (= orig node announces a tvlv of type BATADV_TVLV_MCAST)
  */
 enum batadv_orig_capabilities {
 	BATADV_ORIG_CAPA_HAS_DAT = BIT(0),
 	BATADV_ORIG_CAPA_HAS_NC = BIT(1),
 	BATADV_ORIG_CAPA_HAS_TT = BIT(2),
+	BATADV_ORIG_CAPA_HAS_MCAST = BIT(3),
 };
 
 /**

@@ -612,9 +619,15 @@ struct batadv_priv_dat {
 /**
  * struct batadv_priv_mcast - per mesh interface mcast data
  * @mla_list: list of multicast addresses we are currently announcing via TT
+ * @flags: the flags we have last sent in our mcast tvlv
+ * @enabled: whether the multicast tvlv is currently enabled
+ * @num_disabled: number of nodes that have no mcast tvlv
  */
 struct batadv_priv_mcast {
 	struct hlist_head mla_list;
+	uint8_t flags;
+	bool enabled;
+	atomic_t num_disabled;
 };
 #endif
 

index fe9e1e3..127ba50 100644
@@ -17,6 +17,7 @@
 #include "originator.h"
 #include "hard-interface.h"
 #include "translation-table.h"
+#include "multicast.h"
 
 /**
  * batadv_mcast_mla_softif_get - get softif multicast listeners

@@ -271,6 +272,132 @@ out:
 }
 
 /**
+ * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the IPv6 packet to check
+ *
+ * Check whether the given IPv6 packet has the potential to
+ * be forwarded with a mode more optimal than classic flooding.
+ *
+ * If so then return 0. Otherwise -EINVAL is returned or -ENOMEM if we are
+ * out of memory.
+ */
+static int batadv_mcast_forw_mode_check_ipv6(struct batadv_priv *bat_priv,
+					     struct sk_buff *skb)
+{
+	struct ipv6hdr *ip6hdr;
+
+	/* We might fail due to out-of-memory -> drop it */
+	if (!pskb_may_pull(skb, sizeof(struct ethhdr) + sizeof(*ip6hdr)))
+		return -ENOMEM;
+
+	ip6hdr = ipv6_hdr(skb);
+
+	/* TODO: Implement Multicast Router Discovery (RFC4286),
+	 * then allow scope > link local, too
+	 */
+	if (IPV6_ADDR_MC_SCOPE(&ip6hdr->daddr) !=
+	    IPV6_ADDR_SCOPE_LINKLOCAL)
+		return -EINVAL;
+
+	/* link-local-all-nodes multicast listeners behind a bridge are
+	 * not snoopable (see RFC4541, section 3, paragraph 3)
+	 */
+	if (ipv6_addr_is_ll_all_nodes(&ip6hdr->daddr))
+		return -EINVAL;
+
+	return 0;
+}
+
+/**
+ * batadv_mcast_forw_mode_check - check for optimized forwarding potential
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the multicast frame to check
+ *
+ * Check whether the given multicast ethernet frame has the potential to
+ * be forwarded with a mode more optimal than classic flooding.
+ *
+ * If so then return 0. Otherwise -EINVAL is returned or -ENOMEM if we are
+ * out of memory.
+ */
+static int batadv_mcast_forw_mode_check(struct batadv_priv *bat_priv,
+					struct sk_buff *skb)
+{
+	struct ethhdr *ethhdr = eth_hdr(skb);
+
+	if (!atomic_read(&bat_priv->multicast_mode))
+		return -EINVAL;
+
+	if (atomic_read(&bat_priv->mcast.num_disabled))
+		return -EINVAL;
+
+	switch (ntohs(ethhdr->h_proto)) {
+	case ETH_P_IPV6:
+		return batadv_mcast_forw_mode_check_ipv6(bat_priv, skb);
+	default:
+		return -EINVAL;
+	}
+}
+
+/**
+ * batadv_mcast_forw_tt_node_get - get a multicast tt node
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ethhdr: the ether header containing the multicast destination
+ *
+ * Return an orig_node matching the multicast address provided by ethhdr
+ * via a translation table lookup. This increases the returned nodes refcount.
+ */
+static struct batadv_orig_node *
+batadv_mcast_forw_tt_node_get(struct batadv_priv *bat_priv,
+			      struct ethhdr *ethhdr)
+{
+	return batadv_transtable_search(bat_priv, ethhdr->h_source,
+					ethhdr->h_dest, BATADV_NO_FLAGS);
+}
+
+/**
+ * batadv_mcast_forw_mode - check on how to forward a multicast packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: The multicast packet to check
+ * @orig: an originator to be set to forward the skb to
+ *
+ * Return the forwarding mode as enum batadv_forw_mode and in case of
+ * BATADV_FORW_SINGLE set the orig to the single originator the skb
+ * should be forwarded to.
+ */
+enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **orig)
+{
+	struct ethhdr *ethhdr;
+	int ret, tt_count;
+
+	ret = batadv_mcast_forw_mode_check(bat_priv, skb);
+	if (ret == -ENOMEM)
+		return BATADV_FORW_NONE;
+	else if (ret < 0)
+		return BATADV_FORW_ALL;
+
+	ethhdr = eth_hdr(skb);
+
+	tt_count = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
+					       BATADV_NO_FLAGS);
+
+	switch (tt_count) {
+	case 1:
+		*orig = batadv_mcast_forw_tt_node_get(bat_priv, ethhdr);
+		if (*orig)
+			return BATADV_FORW_SINGLE;
+
+		/* fall through */
+	case 0:
+		return BATADV_FORW_NONE;
+	default:
+		return BATADV_FORW_ALL;
+	}
+}
+
+/**
  * batadv_mcast_tvlv_ogm_handler_v1 - process incoming multicast tvlv container
  * @bat_priv: the bat priv with all the soft interface information
  * @orig: the orig_node of the ogm

index d736335..a76bc3a 100644
@@ -15,10 +15,28 @@
 #ifndef _NET_BATMAN_ADV_MULTICAST_H_
 #define _NET_BATMAN_ADV_MULTICAST_H_
 
+/**
+ * batadv_forw_mode - the way a packet should be forwarded as
+ * @BATADV_FORW_ALL: forward the packet to all nodes
+ *  (currently via classic flooding)
+ * @BATADV_FORW_SINGLE: forward the packet to a single node
+ *  (currently via the BATMAN unicast routing protocol)
+ * @BATADV_FORW_NONE: don't forward, drop it
+ */
+enum batadv_forw_mode {
+	BATADV_FORW_ALL,
+	BATADV_FORW_SINGLE,
+	BATADV_FORW_NONE,
+};
+
 #ifdef CONFIG_BATMAN_ADV_MCAST
 
 void batadv_mcast_mla_update(struct batadv_priv *bat_priv);
 
+enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **mcast_single_orig);
+
 void batadv_mcast_init(struct batadv_priv *bat_priv);
 
 void batadv_mcast_free(struct batadv_priv *bat_priv);

@@ -32,6 +50,13 @@ static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
 	return;
 }
 
+static inline enum batadv_forw_mode
+batadv_mcast_forw_mode(struct batadv_priv *bat_priv, struct sk_buff *skb,
+		       struct batadv_orig_node **mcast_single_orig)
+{
+	return BATADV_FORW_ALL;
+}
+
 static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
 {
 	return 0;

index 31a8c19..ef4c93e 100644
@@ -248,11 +248,11 @@ out:
  *
  * Returns NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
  */
-static int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
-				   struct sk_buff *skb, int packet_type,
-				   int packet_subtype,
-				   struct batadv_orig_node *orig_node,
-				   unsigned short vid)
+int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+			    struct sk_buff *skb, int packet_type,
+			    int packet_subtype,
+			    struct batadv_orig_node *orig_node,
+			    unsigned short vid)
 {
 	struct batadv_unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr;

index aaddaa9..887b63f 100644
@@ -36,6 +36,11 @@ bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
 					   struct sk_buff *skb,
 					   struct batadv_orig_node *orig_node,
 					   int packet_subtype);
+int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
+			    struct sk_buff *skb, int packet_type,
+			    int packet_subtype,
+			    struct batadv_orig_node *orig_node,
+			    unsigned short vid);
 int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
 				   struct sk_buff *skb, int packet_type,
 				   int packet_subtype, uint8_t *dst_hint,

index 8ff47b7..1a643fe 100644
@@ -32,6 +32,7 @@
 #include <linux/ethtool.h>
 #include <linux/etherdevice.h>
 #include <linux/if_vlan.h>
+#include "multicast.h"
 #include "bridge_loop_avoidance.h"
 #include "network-coding.h"
 

@@ -170,6 +171,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
 	unsigned short vid;
 	uint32_t seqno;
 	int gw_mode;
+	enum batadv_forw_mode forw_mode;
+	struct batadv_orig_node *mcast_single_orig = NULL;
 
 	if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
 		goto dropped;

@@ -247,9 +250,19 @@ static int batadv_interface_tx(struct sk_buff *skb,
 			 * directed to a DHCP server
 			 */
 			goto dropped;
-	}
 
 send:
+		if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
+			forw_mode = batadv_mcast_forw_mode(bat_priv, skb,
+							   &mcast_single_orig);
+			if (forw_mode == BATADV_FORW_NONE)
+				goto dropped;
+
+			if (forw_mode == BATADV_FORW_SINGLE)
+				do_bcast = false;
+		}
+	}
+
 	batadv_skb_set_priority(skb, 0);
 
 	/* ethernet packet should be broadcasted */

@@ -301,6 +314,10 @@ send:
 			if (ret)
 				goto dropped;
 			ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
+		} else if (mcast_single_orig) {
+			ret = batadv_send_skb_unicast(bat_priv, skb,
+						      BATADV_UNICAST, 0,
+						      mcast_single_orig, vid);
 		} else {
 			if (batadv_dat_snoop_outgoing_arp_request(bat_priv,
 								  skb))

@@ -691,6 +708,7 @@ static int batadv_softif_init_late(struct net_device *dev)
 #endif
 #ifdef CONFIG_BATMAN_ADV_MCAST
 	bat_priv->mcast.flags = BATADV_NO_FLAGS;
+	atomic_set(&bat_priv->multicast_mode, 1);
 	atomic_set(&bat_priv->mcast.num_disabled, 0);
 #endif
 	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);

index e456bf6..1ebb0d9 100644
@@ -539,6 +539,9 @@ BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
 		     batadv_post_gw_reselect);
 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 		   batadv_store_gw_bwidth);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
+#endif
 #ifdef CONFIG_BATMAN_ADV_DEBUG
 BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
 #endif

@@ -558,6 +561,9 @@ static struct batadv_attribute *batadv_mesh_attrs[] = {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	&batadv_attr_distributed_arp_table,
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	&batadv_attr_multicast_mode,
+#endif
 	&batadv_attr_fragmentation,
 	&batadv_attr_routing_algo,
 	&batadv_attr_gw_mode,

150 lines not on this page · raw message

index 20a1d78..ad84d7b 100644
@@ -29,6 +29,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset);
 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
 			       struct batadv_orig_node *orig_node,
 			       int32_t match_vid, const char *message);
+int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
+				const uint8_t *addr, unsigned short vid);
 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
 						  const uint8_t *src,
 						  const uint8_t *addr,

index 96ee0d2..c28fc4a 100644
@@ -696,6 +696,8 @@ struct batadv_softif_vlan {
  *  enabled
  * @distributed_arp_table: bool indicating whether distributed ARP table is
  *  enabled
+ * @multicast_mode: Enable or disable multicast optimizations on this node's
+ *  sender/originating side
  * @gw_mode: gateway operation: off, client or server (see batadv_gw_modes)
  * @gw_sel_class: gateway selection class (applies if gw_mode client)
  * @orig_interval: OGM broadcast interval in milliseconds

@@ -746,6 +748,9 @@ struct batadv_priv {
 #ifdef CONFIG_BATMAN_ADV_DAT
 	atomic_t distributed_arp_table;
 #endif
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	atomic_t multicast_mode;
+#endif
 	atomic_t gw_mode;
 	atomic_t gw_sel_class;
 	atomic_t orig_interval;

@@ -909,12 +914,14 @@ struct batadv_tt_local_entry {
  * struct batadv_tt_global_entry - translation table global entry data
  * @common: general translation table data
  * @orig_list: list of orig nodes announcing this non-mesh client
+ * @orig_list_count: number of items in the orig_list
  * @list_lock: lock protecting orig_list
  * @roam_at: time at which TT_GLOBAL_ROAM was set
  */
 struct batadv_tt_global_entry {
 	struct batadv_tt_common_entry common;
 	struct hlist_head orig_list;
+	atomic_t orig_list_count;
 	spinlock_t list_lock;	/* protects orig_list */
 	unsigned long roam_at;
 };

index 8f11b67..57b09fa 100644
@@ -111,6 +111,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	spin_lock_init(&bat_priv->tt.last_changeset_lock);
 	spin_lock_init(&bat_priv->tt.commit_lock);
 	spin_lock_init(&bat_priv->gw.list_lock);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	spin_lock_init(&bat_priv->mcast.want_lists_lock);
+#endif
 	spin_lock_init(&bat_priv->tvlv.container_list_lock);
 	spin_lock_init(&bat_priv->tvlv.handler_list_lock);
 	spin_lock_init(&bat_priv->softif_vlan_list_lock);

@@ -118,6 +121,9 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
 	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
 	INIT_HLIST_HEAD(&bat_priv->gw.list);
+#ifdef CONFIG_BATMAN_ADV_MCAST
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
+#endif
 	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
 	INIT_LIST_HEAD(&bat_priv->tt.req_list);
 	INIT_LIST_HEAD(&bat_priv->tt.roam_list);

index dc6b4a2..a31da5a 100644
@@ -177,6 +177,7 @@ enum batadv_uev_type {
 #include <linux/slab.h>
 #include <net/sock.h>		/* struct sock */
 #include <net/addrconf.h>	/* ipv6 address stuff */
+#include <linux/ip.h>
 #include <net/rtnetlink.h>
 #include <linux/jiffies.h>
 #include <linux/seq_file.h>

212 lines not on this page · raw message

index e8c483d..0aada24 100644
@@ -89,6 +89,15 @@ enum batadv_icmp_packettype {
 	BATADV_PARAMETER_PROBLEM       = 12,
 };
 
+/**
+ * enum batadv_mcast_flags - flags for multicast capabilities and settings
+ * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
+ *  224.0.0.0/24 or ff02::1
+ */
+enum batadv_mcast_flags {
+	BATADV_MCAST_WANT_ALL_UNSNOOPABLES = BIT(0),
+};
+
 /* tt data subtypes */
 #define BATADV_TT_DATA_TYPE_MASK 0x0F
 

index 1a643fe..db6feca 100644
@@ -710,6 +710,7 @@ static int batadv_softif_init_late(struct net_device *dev)
 	bat_priv->mcast.flags = BATADV_NO_FLAGS;
 	atomic_set(&bat_priv->multicast_mode, 1);
 	atomic_set(&bat_priv->mcast.num_disabled, 0);
+	atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
 #endif
 	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 	atomic_set(&bat_priv->gw_sel_class, 20);

index c28fc4a..1a674cb 100644
@@ -205,6 +205,8 @@ struct batadv_orig_bat_iv {
  * @last_seen: time when last packet from this node was received
  * @bcast_seqno_reset: time when the broadcast seqno window was reset
  * @mcast_flags: multicast flags announced by the orig node
+ * @mcast_want_all_unsnoop_node: a list node for the
+ *  mcast.want_all_unsnoopables list
  * @capabilities: announced capabilities of this originator
  * @capa_initialized: bitfield to remember whether a capability was initialized
  * @last_ttvn: last seen translation table version number

@@ -249,6 +251,7 @@ struct batadv_orig_node {
 	unsigned long bcast_seqno_reset;
 #ifdef CONFIG_BATMAN_ADV_MCAST
 	uint8_t mcast_flags;
+	struct hlist_node mcast_want_all_unsnoopables_node;
 #endif
 	uint8_t capabilities;
 	uint8_t capa_initialized;

@@ -619,15 +622,24 @@ struct batadv_priv_dat {
 /**
  * struct batadv_priv_mcast - per mesh interface mcast data
  * @mla_list: list of multicast addresses we are currently announcing via TT
+ * @want_all_unsnoopables_list: a list of orig_nodes wanting all unsnoopable
+ *  multicast traffic
  * @flags: the flags we have last sent in our mcast tvlv
  * @enabled: whether the multicast tvlv is currently enabled
  * @num_disabled: number of nodes that have no mcast tvlv
+ * @num_want_all_unsnoopables: number of nodes wanting unsnoopable IP traffic
+ * @want_lists_lock: lock for protecting modifications to mcast want lists
+ *  (traversals are rcu-locked)
  */
 struct batadv_priv_mcast {
 	struct hlist_head mla_list;
+	struct hlist_head want_all_unsnoopables_list;
 	uint8_t flags;
 	bool enabled;
 	atomic_t num_disabled;
+	atomic_t num_want_all_unsnoopables;
+	/* protects want_all_unsnoopables_list */
+	spinlock_t want_lists_lock;
 };
 #endif
 

index 57b09fa..d1183e8 100644
@@ -123,6 +123,8 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_HLIST_HEAD(&bat_priv->gw.list);
 #ifdef CONFIG_BATMAN_ADV_MCAST
 	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_unsnoopables_list);
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv4_list);
+	INIT_HLIST_HEAD(&bat_priv->mcast.want_all_ipv6_list);
 #endif
 	INIT_LIST_HEAD(&bat_priv->tt.changes_list);
 	INIT_LIST_HEAD(&bat_priv->tt.req_list);

226 lines not on this page · raw message

index 0aada24..feaa336 100644
@@ -93,9 +93,13 @@ enum batadv_icmp_packettype {
  * enum batadv_mcast_flags - flags for multicast capabilities and settings
  * @BATADV_MCAST_WANT_ALL_UNSNOOPABLES: we want all packets destined for
  *  224.0.0.0/24 or ff02::1
+ * @BATADV_MCAST_WANT_ALL_IPV4: we want all IPv4 multicast packets
+ * @BATADV_MCAST_WANT_ALL_IPV6: we want all IPv6 multicast packets
  */
 enum batadv_mcast_flags {
 	BATADV_MCAST_WANT_ALL_UNSNOOPABLES = BIT(0),
+	BATADV_MCAST_WANT_ALL_IPV4 = BIT(1),
+	BATADV_MCAST_WANT_ALL_IPV6 = BIT(2),
 };
 
 /* tt data subtypes */

index ef4c93e..aad6d4b 100644
@@ -27,6 +27,7 @@
 #include "originator.h"
 #include "network-coding.h"
 #include "fragmentation.h"
+#include "multicast.h"
 
 static void batadv_send_outstanding_bcast_packet(struct work_struct *work);
 

index db6feca..744a59b 100644
@@ -711,6 +711,8 @@ static int batadv_softif_init_late(struct net_device *dev)
 	atomic_set(&bat_priv->multicast_mode, 1);
 	atomic_set(&bat_priv->mcast.num_disabled, 0);
 	atomic_set(&bat_priv->mcast.num_want_all_unsnoopables, 0);
+	atomic_set(&bat_priv->mcast.num_want_all_ipv4, 0);
+	atomic_set(&bat_priv->mcast.num_want_all_ipv6, 0);
 #endif
 	atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
 	atomic_set(&bat_priv->gw_sel_class, 20);

index 1a674cb..d4b923c 100644
@@ -207,6 +207,8 @@ struct batadv_orig_bat_iv {
  * @mcast_flags: multicast flags announced by the orig node
  * @mcast_want_all_unsnoop_node: a list node for the
  *  mcast.want_all_unsnoopables list
+ * @mcast_want_all_ipv4_node: a list node for the mcast.want_all_ipv4 list
+ * @mcast_want_all_ipv6_node: a list node for the mcast.want_all_ipv6 list
  * @capabilities: announced capabilities of this originator
  * @capa_initialized: bitfield to remember whether a capability was initialized
  * @last_ttvn: last seen translation table version number

@@ -252,6 +254,8 @@ struct batadv_orig_node {
 #ifdef CONFIG_BATMAN_ADV_MCAST
 	uint8_t mcast_flags;
 	struct hlist_node mcast_want_all_unsnoopables_node;
+	struct hlist_node mcast_want_all_ipv4_node;
+	struct hlist_node mcast_want_all_ipv6_node;
 #endif
 	uint8_t capabilities;
 	uint8_t capa_initialized;

@@ -624,21 +628,29 @@ struct batadv_priv_dat {
  * @mla_list: list of multicast addresses we are currently announcing via TT
  * @want_all_unsnoopables_list: a list of orig_nodes wanting all unsnoopable
  *  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
  * @flags: the flags we have last sent in our mcast tvlv
  * @enabled: whether the multicast tvlv is currently enabled
  * @num_disabled: number of nodes that have no mcast tvlv
  * @num_want_all_unsnoopables: number of nodes wanting unsnoopable IP traffic
+ * @num_want_all_ipv4: counter for items in want_all_ipv4_list
+ * @num_want_all_ipv6: counter for items in want_all_ipv6_list
  * @want_lists_lock: lock for protecting modifications to mcast want lists
  *  (traversals are rcu-locked)
  */
 struct batadv_priv_mcast {
 	struct hlist_head mla_list;
 	struct hlist_head want_all_unsnoopables_list;
+	struct hlist_head want_all_ipv4_list;
+	struct hlist_head want_all_ipv6_list;
 	uint8_t flags;
 	bool enabled;
 	atomic_t num_disabled;
 	atomic_t num_want_all_unsnoopables;
-	/* protects want_all_unsnoopables_list */
+	atomic_t num_want_all_ipv4;
+	atomic_t num_want_all_ipv6;
+	/* protects want_all_{unsnoopables,ipv4,ipv6}_list */
 	spinlock_t want_lists_lock;
 };
 #endif