@@ -21,6 +21,7 @@
#include "originator.h"
#include "hard-interface.h"
#include "translation-table.h"
+#include "multicast.h"
/**
* batadv_mcast_mla_softif_get - get softif multicast listeners
@@ -265,6 +266,107 @@ out:
}
/**
+ * batadv_mcast_forw_mode_check_ipv6 - check for optimized forwarding potential
+ * @skb: the IPv6 packet to check
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * 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 sk_buff *skb,
+ struct batadv_priv *bat_priv)
+{
+ 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;
+
+ /* With one bridge involved, we cannot be certain about
+ * link-local-all-nodes multicast listener announcements anymore
+ * (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
+ * @skb: the multicast frame to check
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * 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 sk_buff *skb,
+ struct batadv_priv *bat_priv)
+{
+ struct ethhdr *ethhdr = (struct ethhdr *)(skb->data);
+
+ 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(skb, bat_priv);
+ default:
+ return -EINVAL;
+ }
+}
+
+/**
+ * batadv_mcast_forw_mode - check on how to forward a multicast packet
+ * @skb: The multicast packet to check
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Return the forwarding mode as enum batadv_forw_mode.
+ */
+enum batadv_forw_mode
+batadv_mcast_forw_mode(struct sk_buff *skb, struct batadv_priv *bat_priv)
+{
+ struct ethhdr *ethhdr = (struct ethhdr *)(skb->data);
+ int ret;
+
+ ret = batadv_mcast_forw_mode_check(skb, bat_priv);
+ if (ret == -ENOMEM)
+ return BATADV_FORW_NONE;
+ else if (ret < 0)
+ return BATADV_FORW_ALL;
+
+ ret = batadv_tt_global_hash_count(bat_priv, ethhdr->h_dest,
+ BATADV_NO_FLAGS);
+
+ switch (ret) {
+ case 0:
+ return BATADV_FORW_NONE;
+ case 1:
+ return BATADV_FORW_SINGLE;
+ default:
+ return BATADV_FORW_ALL;
+ }
+}
+
+/**
* batadv_mcast_counter_update - update the counter of a flag
* @flag: the flag we want to update counters for
* @flag_counter: the counter we might update
@@ -20,10 +20,27 @@
#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_IV 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 sk_buff *skb, struct batadv_priv *bat_priv);
+
int batadv_mcast_init(struct batadv_priv *bat_priv);
void batadv_mcast_free(struct batadv_priv *bat_priv);
@@ -37,6 +54,12 @@ static inline void batadv_mcast_mla_update(struct batadv_priv *bat_priv)
return;
}
+static inline enum batadv_forw_mode
+batadv_mcast_forw_mode(struct sk_buff *skb, struct batadv_priv *bat_priv)
+{
+ return BATADV_FORW_ALL;
+}
+
static inline int batadv_mcast_init(struct batadv_priv *bat_priv)
{
return 0;
@@ -34,6 +34,7 @@
#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"
@@ -169,6 +170,8 @@ static int batadv_interface_tx(struct sk_buff *skb,
bool do_bcast = false;
unsigned short vid;
uint32_t seqno;
+ enum batadv_forw_mode mode;
+ bool forw_to_gw = false;
if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
goto dropped;
@@ -229,17 +232,29 @@ static int batadv_interface_tx(struct sk_buff *skb,
* via unicast to their gateway
*/
ret = batadv_gw_is_dhcp_target(skb, &header_len);
- if (ret)
+ if (ret) {
do_bcast = false;
+ forw_to_gw = true;
+ }
break;
case BATADV_GW_MODE_OFF:
default:
break;
}
- /* reminder: ethhdr might have become unusable from here on
- * (batadv_gw_is_dhcp_target() might have reallocated skb data)
+ /* skb->data might have been reallocated by
+ * batadv_gw_is_dhcp_target()
*/
+ ethhdr = (struct ethhdr *)skb->data;
+
+ if (do_bcast && !is_broadcast_ether_addr(ethhdr->h_dest)) {
+ mode = batadv_mcast_forw_mode(skb, bat_priv);
+ if (mode == BATADV_FORW_NONE)
+ goto dropped;
+
+ if (mode == BATADV_FORW_SINGLE)
+ do_bcast = false;
+ }
}
batadv_skb_set_priority(skb, 0);
@@ -298,7 +313,7 @@ static int batadv_interface_tx(struct sk_buff *skb,
batadv_dat_snoop_outgoing_arp_reply(bat_priv, skb);
- if (is_multicast_ether_addr(ethhdr->h_dest))
+ if (forw_to_gw)
ret = batadv_send_skb_via_gw(bat_priv, skb, vid);
else
ret = batadv_send_skb_via_tt(bat_priv, skb, vid);
@@ -660,6 +675,7 @@ static int batadv_softif_init_late(struct net_device *dev)
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
bat_priv->mcast.flags = BATADV_UNINIT_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);
@@ -68,6 +68,15 @@ Description:
Defines the penalty which will be applied to an
originator message's tq-field on every hop.
+What: /sys/class/net/<mesh_iface>/mesh/multicast_mode
+Date: June 2013
+Contact: Linus Lüssing <linus.luessing@web.de>
+Description:
+ Indicates whether multicast optimizations are enabled
+ or disabled. If set to zero then all nodes in the
+ mesh are going to use classic flooding for any
+ multicast packet with no optimizations.
+
What: /sys/class/net/<mesh_iface>/mesh/network_coding
Date: Nov 2012
Contact: Martin Hundeboll <martin@hundeboll.net>
@@ -464,6 +464,9 @@ BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
batadv_post_gw_deselect);
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
@@ -481,6 +484,9 @@ 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,
@@ -195,6 +195,32 @@ batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
}
}
+/**
+ * batadv_tt_global_hash_count - count the number of orig entries
+ * @hash: hash table containing the tt entries
+ * @addr: the mac address of the client to count entries for
+ * @vid: VLAN identifier
+ *
+ * Return the number of originators advertising the given address/data
+ * (excluding ourself).
+ */
+int batadv_tt_global_hash_count(struct batadv_priv *bat_priv,
+ const uint8_t *addr, unsigned short vid)
+{
+ struct batadv_tt_global_entry *tt_global_entry;
+ int count = 0;
+
+ tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
+ if (!tt_global_entry)
+ goto out;
+
+ count = atomic_read(&tt_global_entry->orig_list_count);
+ batadv_tt_global_entry_free_ref(tt_global_entry);
+
+out:
+ return count;
+}
+
static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
{
struct batadv_tt_orig_list_entry *orig_entry;
@@ -1122,6 +1148,8 @@ batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
hlist_add_head_rcu(&orig_entry->list,
&tt_global->orig_list);
spin_unlock_bh(&tt_global->list_lock);
+ atomic_inc(&tt_global->orig_list_count);
+
out:
if (orig_entry)
batadv_tt_orig_list_entry_free_ref(orig_entry);
@@ -1195,6 +1223,7 @@ static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
common->added_at = jiffies;
INIT_HLIST_HEAD(&tt_global_entry->orig_list);
+ atomic_set(&tt_global_entry->orig_list_count, 0);
spin_lock_init(&tt_global_entry->list_lock);
hash_added = batadv_hash_add(bat_priv->tt.global_hash,
@@ -1441,6 +1470,25 @@ out:
return 0;
}
+/**
+ * batadv_tt_global_del_orig_entry - remove and free an orig_entry
+ * @tt_global_entry: the global entry to remove the orig_entry from
+ * @orig_entry: the orig entry to remove and free
+ *
+ * Remove an orig_entry from its list in the given tt_global_entry and
+ * free this orig_entry afterwards.
+ */
+static void
+batadv_tt_global_del_orig_entry(struct batadv_tt_global_entry *tt_global_entry,
+ struct batadv_tt_orig_list_entry *orig_entry)
+{
+ batadv_tt_global_size_dec(orig_entry->orig_node,
+ tt_global_entry->common.vid);
+ atomic_dec(&tt_global_entry->orig_list_count);
+ hlist_del_rcu(&orig_entry->list);
+ batadv_tt_orig_list_entry_free_ref(orig_entry);
+}
+
/* deletes the orig list of a tt_global_entry */
static void
batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
@@ -1451,20 +1499,26 @@ batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
spin_lock_bh(&tt_global_entry->list_lock);
head = &tt_global_entry->orig_list;
- hlist_for_each_entry_safe(orig_entry, safe, head, list) {
- hlist_del_rcu(&orig_entry->list);
- batadv_tt_global_size_dec(orig_entry->orig_node,
- tt_global_entry->common.vid);
- batadv_tt_orig_list_entry_free_ref(orig_entry);
- }
+ hlist_for_each_entry_safe(orig_entry, safe, head, list)
+ batadv_tt_global_del_orig_entry(tt_global_entry, orig_entry);
spin_unlock_bh(&tt_global_entry->list_lock);
}
+/**
+ * batadv_tt_global_del_orig_node - remove orig_node from a global tt entry
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tt_global_entry: the global entry to remove the orig_node from
+ * @orig_node: the originator announcing the client
+ * @message: message to append to the log on deletion
+ *
+ * Remove the given orig_node and its according orig_entry from the given
+ * global tt entry.
+ */
static void
-batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
- struct batadv_tt_global_entry *tt_global_entry,
- struct batadv_orig_node *orig_node,
- const char *message)
+batadv_tt_global_del_orig_node(struct batadv_priv *bat_priv,
+ struct batadv_tt_global_entry *tt_global_entry,
+ struct batadv_orig_node *orig_node,
+ const char *message)
{
struct hlist_head *head;
struct hlist_node *safe;
@@ -1481,10 +1535,8 @@ batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
orig_node->orig,
tt_global_entry->common.addr,
BATADV_PRINT_VID(vid), message);
- hlist_del_rcu(&orig_entry->list);
- batadv_tt_global_size_dec(orig_node,
- tt_global_entry->common.vid);
- batadv_tt_orig_list_entry_free_ref(orig_entry);
+ batadv_tt_global_del_orig_entry(tt_global_entry,
+ orig_entry);
}
}
spin_unlock_bh(&tt_global_entry->list_lock);
@@ -1526,8 +1578,8 @@ batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
/* there is another entry, we can simply delete this
* one and can still use the other one.
*/
- batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
- orig_node, message);
+ batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
+ orig_node, message);
}
/**
@@ -1553,8 +1605,8 @@ static void batadv_tt_global_del(struct batadv_priv *bat_priv,
goto out;
if (!roaming) {
- batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
- orig_node, message);
+ batadv_tt_global_del_orig_node(bat_priv, tt_global_entry,
+ orig_node, message);
if (hlist_empty(&tt_global_entry->orig_list))
batadv_tt_global_free(bat_priv, tt_global_entry,
@@ -1637,8 +1689,8 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
struct batadv_tt_global_entry,
common);
- batadv_tt_global_del_orig_entry(bat_priv, tt_global,
- orig_node, message);
+ batadv_tt_global_del_orig_node(bat_priv, tt_global,
+ orig_node, message);
if (hlist_empty(&tt_global->orig_list)) {
vid = tt_global->common.vid;
@@ -31,6 +31,8 @@ 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,
@@ -669,6 +669,9 @@ 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;
@@ -830,12 +833,14 @@ 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;
};