gluon/patches/packages/routing/0002-batman-adv-introduce-no_rebroadcast-option.patch

From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Thu, 2 Apr 2015 20:24:14 +0200
Subject: batman-adv: introduce 'no_rebroadcast' option

diff --git a/batman-adv/files/lib/netifd/proto/batadv.sh b/batman-adv/files/lib/netifd/proto/batadv.sh
index 1e0c9d0fe24d44c7f7cc9bddaf8065c60f680862..d0ab238d2652c05a08c5f4bede428a36cdedf345 100644
--- a/batman-adv/files/lib/netifd/proto/batadv.sh
+++ b/batman-adv/files/lib/netifd/proto/batadv.sh
@@ -7,19 +7,22 @@ init_proto "$@"
 proto_batadv_init_config() {
 	proto_config_add_string "mesh"
 	proto_config_add_string "routing_algo"
+	proto_config_add_string "mesh_no_rebroadcast"
 }
 
 proto_batadv_setup() {
 	local config="$1"
 	local iface="$2"
 
-	local mesh routing_algo
-	json_get_vars mesh routing_algo
+	local mesh routing_algo mesh_no_rebroadcast
+	json_get_vars mesh routing_algo mesh_no_rebroadcast
 
 	[ -n "$routing_algo" ] || routing_algo="BATMAN_IV"
 	echo "$routing_algo" > "/sys/module/batman_adv/parameters/routing_algo"
 
 	echo "$mesh" > "/sys/class/net/$iface/batman_adv/mesh_iface"
+	[ -n "$mesh_no_rebroadcast" ] && echo "$mesh_no_rebroadcast" > "/sys/class/net/$iface/batman_adv/no_rebroadcast"
+
 	proto_init_update "$iface" 1
 	proto_send_update "$config"
 }
diff --git a/batman-adv/patches/1001-batman-adv-introduce-no_rebroadcast-option.patch b/batman-adv/patches/1001-batman-adv-introduce-no_rebroadcast-option.patch
new file mode 100644
index 0000000000000000000000000000000000000000..e9f5ffb4408fb07887aa5948e69e4db1ff05fb3b
--- /dev/null
+++ b/batman-adv/patches/1001-batman-adv-introduce-no_rebroadcast-option.patch
@@ -0,0 +1,189 @@
+From bb66988dc6972d5400b4ff4f0b49ed090007d635 Mon Sep 17 00:00:00 2001
+Message-Id: <bb66988dc6972d5400b4ff4f0b49ed090007d635.1466049319.git.mschiffer@universe-factory.net>
+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@web.de>
+Date: Tue, 24 Sep 2013 04:36:27 +0200
+Subject: [PATCH 1/2] batman-adv: introduce 'no_rebroadcast' option
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+This patch introduces a new sysfs option named "no_rebroadcast" on
+a per hard interface basis. It allows manually enabling a split-horizon
+like behaviour for the layer 2 multicast payload frames, in that
+incoming multicast payload frames on such a hard interface are only
+being rebroadcasted on all interfaces except the incoming one instead
+of being rebroadcasted on all interfaces.
+
+Such an option should only be enabled if you are certain that these
+rebroadcasts are unnecessary. This is usually the case for instance
+for point-to-point wifi longshots or wired links.
+
+This option can especially safe a significant amount of upload overhead
+if the neighbourhood on a link is rather large, for instance in some
+transitive, symmetric VPN configurations.
+
+Using this option wrongly will break your mesh network, use this option
+wisely and at your own risk!
+
+Signed-off-by: Linus Lüssing <linus.luessing@web.de>
+---
+ .../ABI/testing/sysfs-class-net-batman-adv         | 11 ++++
+ net/batman-adv/hard-interface.c                    |  2 +
+ net/batman-adv/send.c                              |  4 ++
+ net/batman-adv/sysfs.c                             | 59 ++++++++++++++++++++++
+ net/batman-adv/types.h                             |  1 +
+ 5 files changed, 77 insertions(+)
+
+diff --git a/Documentation/ABI/testing/sysfs-class-net-batman-adv b/Documentation/ABI/testing/sysfs-class-net-batman-adv
+index 518f6a1..896c480 100644
+--- a/Documentation/ABI/testing/sysfs-class-net-batman-adv
++++ b/Documentation/ABI/testing/sysfs-class-net-batman-adv
+@@ -28,3 +28,14 @@ Description:
+                 The /sys/class/net/<iface>/batman-adv/mesh_iface file
+                 displays the batman mesh interface this <iface>
+                 currently is associated with.
++
++What:           /sys/class/net/<iface>/batman-adv/no_rebroadcast
++Date:           Sep 2013
++Contact:        Linus Lüssing <linus.luessing@web.de>
++Description:
++                With this option set incoming multicast payload frames on
++                <iface> are not being rebroadcasted on <iface> again. This
++                option should be set on links which are known to be transitive
++                and symmetric only, for instance point-to-point wifi longshots
++                or wired links. Using this option wrongly is going to
++                break your mesh network, use at your own risk!
+diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c
+index 8c2f399..48e53d0 100644
+--- a/net/batman-adv/hard-interface.c
++++ b/net/batman-adv/hard-interface.c
+@@ -690,6 +690,8 @@ batadv_hardif_add_interface(struct net_device *net_dev)
+ 	kref_init(&hard_iface->refcount);
+ 	kref_get(&hard_iface->refcount);
+ 
++	atomic_set(&hard_iface->no_rebroadcast, 0);
++
+ 	batadv_check_known_mac_addr(hard_iface->net_dev);
+ 	list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
+ 
+diff --git a/net/batman-adv/send.c b/net/batman-adv/send.c
+index f2f1256..3736d75 100644
+--- a/net/batman-adv/send.c
++++ b/net/batman-adv/send.c
+@@ -578,6 +578,10 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
+ 		if (forw_packet->num_packets >= hard_iface->num_bcasts)
+ 			continue;
+ 
++		if (atomic_read(&hard_iface->no_rebroadcast) &&
++		    forw_packet->skb->dev == hard_iface->net_dev)
++			continue;
++
+ 		if (!kref_get_unless_zero(&hard_iface->refcount))
+ 			continue;
+ 
+diff --git a/net/batman-adv/sysfs.c b/net/batman-adv/sysfs.c
+index 414b207..9aa043f 100644
+--- a/net/batman-adv/sysfs.c
++++ b/net/batman-adv/sysfs.c
+@@ -134,6 +134,17 @@ struct batadv_attribute batadv_attr_vlan_##_name = {	\
+ 	.store  = _store,				\
+ }
+ 
++/* Use this, if you have customized show and store functions
++ * for hard interface attrs
++ */
++#define BATADV_ATTR_HIF(_name, _mode, _show, _store)	\
++struct batadv_attribute batadv_attr_hif_##_name = {	\
++	.attr = {.name = __stringify(_name),		\
++		 .mode = _mode },			\
++	.show   = _show,				\
++	.store  = _store,				\
++};
++
+ /* Use this, if you have customized show and store functions */
+ #define BATADV_ATTR(_name, _mode, _show, _store)	\
+ struct batadv_attribute batadv_attr_##_name = {		\
+@@ -293,6 +304,52 @@ ssize_t batadv_show_##_name(struct kobject *kobj,			\
+ 	static BATADV_ATTR(_name, _mode, batadv_show_##_name,		\
+ 			   batadv_store_##_name)
+ 
++#define BATADV_ATTR_HIF_STORE_BOOL(_name, _post_func)			\
++ssize_t batadv_store_hif_##_name(struct kobject *kobj,			\
++				 struct attribute *attr, char *buff,	\
++				 size_t count)				\
++{									\
++	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);	\
++	struct batadv_hard_iface *hard_iface;				\
++	size_t res;							\
++									\
++	hard_iface = batadv_hardif_get_by_netdev(net_dev);		\
++	if (!hard_iface)						\
++		return 0;						\
++									\
++	res = __batadv_store_bool_attr(buff, count, _post_func,		\
++					      attr, &hard_iface->_name,	\
++					      hard_iface->soft_iface);	\
++	batadv_hardif_put(hard_iface);					\
++	return res;							\
++}
++
++#define BATADV_ATTR_HIF_SHOW_BOOL(_name)				\
++ssize_t batadv_show_hif_##_name(struct kobject *kobj,			\
++				struct attribute *attr, char *buff)	\
++{									\
++	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);	\
++	struct batadv_hard_iface *hard_iface;				\
++	size_t res;							\
++									\
++	hard_iface = batadv_hardif_get_by_netdev(net_dev);		\
++	if (!hard_iface)						\
++		return 0;						\
++									\
++	res = sprintf(buff, "%s\n",					\
++		      atomic_read(&hard_iface->_name) == 0 ?		\
++				"disabled" : "enabled");		\
++	batadv_hardif_put(hard_iface);					\
++	return res;							\
++}
++
++/* Use this, if you are going to turn a [name] in the vlan struct on or off */
++#define BATADV_ATTR_HIF_BOOL(_name, _mode, _post_func)			\
++	static BATADV_ATTR_HIF_STORE_BOOL(_name, _post_func)		\
++	static BATADV_ATTR_HIF_SHOW_BOOL(_name)				\
++	static BATADV_ATTR_HIF(_name, _mode, batadv_show_hif_##_name,	\
++			       batadv_store_hif_##_name)
++
+ static int batadv_store_bool_attr(char *buff, size_t count,
+ 				  struct net_device *net_dev,
+ 				  const char *attr_name, atomic_t *attr,
+@@ -993,6 +1050,7 @@ static ssize_t batadv_show_throughput_override(struct kobject *kobj,
+ static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
+ 		   batadv_store_mesh_iface);
+ static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
++BATADV_ATTR_HIF_BOOL(no_rebroadcast, S_IRUGO | S_IWUSR, NULL);
+ #ifdef CONFIG_BATMAN_ADV_BATMAN_V
+ BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR,
+ 		     2 * BATADV_JITTER, INT_MAX, NULL);
+@@ -1004,6 +1062,7 @@ static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR,
+ static struct batadv_attribute *batadv_batman_attrs[] = {
+ 	&batadv_attr_mesh_iface,
+ 	&batadv_attr_iface_status,
++	&batadv_attr_hif_no_rebroadcast,
+ #ifdef CONFIG_BATMAN_ADV_BATMAN_V
+ 	&batadv_attr_elp_interval,
+ 	&batadv_attr_throughput_override,
+diff --git a/net/batman-adv/types.h b/net/batman-adv/types.h
+index ba846b0..1a596c5 100644
+--- a/net/batman-adv/types.h
++++ b/net/batman-adv/types.h
+@@ -156,6 +156,7 @@ struct batadv_hard_iface {
+ 	struct hlist_head neigh_list;
+ 	/* neigh_list_lock protects: neigh_list */
+ 	spinlock_t neigh_list_lock;
++	atomic_t no_rebroadcast;
+ };
+ 
+ /**
+-- 
+2.8.3
+