Add batman-adv no_rebroadcast patch from legacy firmware
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Matthias Schiffer
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dc10f216f2
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@ -0,0 +1,224 @@
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From: Linus Lüssing <linus.luessing@web.de>
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Date: Fri, 15 Nov 2013 10:25:45 +0100
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Subject: batman-adv: Add no-rebroadcast patch
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Adds a patch for batman-adv which allows us to disable rebroadcasts of
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multicast "payload" frames on the incoming interface for
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specific interfaces.
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diff --git a/batman-adv/files/lib/netifd/proto/batadv.sh b/batman-adv/files/lib/netifd/proto/batadv.sh
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index 632a209..01f567f 100644
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--- a/batman-adv/files/lib/netifd/proto/batadv.sh
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+++ b/batman-adv/files/lib/netifd/proto/batadv.sh
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@@ -6,16 +6,19 @@ init_proto "$@"
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proto_batadv_init_config() {
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proto_config_add_string "mesh"
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+ proto_config_add_string "mesh_no_rebroadcast"
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}
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proto_batadv_setup() {
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local config="$1"
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local iface="$2"
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- local mesh
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- json_get_vars mesh
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+ local mesh mesh_no_rebroadcast
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+ json_get_vars mesh mesh_no_rebroadcast
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echo "$mesh" > "/sys/class/net/$iface/batman_adv/mesh_iface"
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+ [ -n "$mesh_no_rebroadcast" ] && echo "$mesh_no_rebroadcast" > "/sys/class/net/$iface/batman_adv/no_rebroadcast"
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+
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proto_init_update "$iface" 1
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proto_send_update "$config"
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}
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diff --git a/batman-adv/patches/0001-batman-adv-introduce-no_rebroadcast-option.patch b/batman-adv/patches/0001-batman-adv-introduce-no_rebroadcast-option.patch
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new file mode 100644
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index 0000000..db42f83
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--- /dev/null
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+++ b/batman-adv/patches/0001-batman-adv-introduce-no_rebroadcast-option.patch
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@@ -0,0 +1,184 @@
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+From 2bf08efc923da85b00354d5dcba6cddc6a8c09ce Mon Sep 17 00:00:00 2001
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+From: =?UTF-8?q?Linus=20L=C3=BCssing?= <linus.luessing@web.de>
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+Date: Tue, 24 Sep 2013 04:36:27 +0200
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+Subject: [PATCH] batman-adv: introduce 'no_rebroadcast' option
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+MIME-Version: 1.0
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+Content-Type: text/plain; charset=UTF-8
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+Content-Transfer-Encoding: 8bit
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+
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+This patch introduces a new sysfs option named "no_rebroadcast" on
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+a per hard interface basis. It allows manually enabling a split-horizon
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+like behaviour for the layer 2 multicast payload frames, in that
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+incoming multicast payload frames on such a hard interface are only
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+being rebroadcasted on all interfaces except the incoming one instead
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+of being rebroadcasted on all interfaces.
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+
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+Such an option should only be enabled if you are certain that these
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+rebroadcasts are unnecessary. This is usually the case for instance
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+for point-to-point wifi longshots or wired links.
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+
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+This option can especially safe a significant amount of upload overhead
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+if the neighbourhood on a link is rather large, for instance in some
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+transitive, symmetric VPN configurations.
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+
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+Using this option wrongly will break your mesh network, use this option
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+wisely and at your own risk!
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+
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+Signed-off-by: Linus Lüssing <linus.luessing@web.de>
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+---
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+ hard-interface.c | 2 ++
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+ send.c | 4 +++
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+ sysfs-class-net-batman-adv | 10 ++++++++
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+ sysfs.c | 59 ++++++++++++++++++++++++++++++++++++++++++++
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+ types.h | 1 +
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+ 5 files changed, 76 insertions(+)
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+
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+diff --git a/hard-interface.c b/hard-interface.c
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+index c478e6b..e0afd19 100644
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+--- a/hard-interface.c
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++++ b/hard-interface.c
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+@@ -600,6 +600,8 @@ batadv_hardif_add_interface(struct net_device *net_dev)
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+ /* extra reference for return */
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+ atomic_set(&hard_iface->refcount, 2);
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+
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++ atomic_set(&hard_iface->no_rebroadcast, 0);
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++
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+ batadv_check_known_mac_addr(hard_iface->net_dev);
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+ list_add_tail_rcu(&hard_iface->list, &batadv_hardif_list);
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+
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+diff --git a/send.c b/send.c
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+index e9ff8d8..05287e6 100644
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+--- a/send.c
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++++ b/send.c
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+@@ -272,6 +272,10 @@ static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
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+ if (forw_packet->num_packets >= hard_iface->num_bcasts)
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+ continue;
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+
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++ if (atomic_read(&hard_iface->no_rebroadcast) &&
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++ forw_packet->skb->dev == hard_iface->net_dev)
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++ continue;
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++
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+ /* send a copy of the saved skb */
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+ skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
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+ if (skb1)
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+diff --git a/sysfs-class-net-batman-adv b/sysfs-class-net-batman-adv
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+index bdc0070..88f6f70 100644
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+--- a/sysfs-class-net-batman-adv
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++++ b/sysfs-class-net-batman-adv
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+@@ -13,3 +13,13 @@ Description:
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+ displays the batman mesh interface this <iface>
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+ currently is associated with.
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+
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++What: /sys/class/net/<iface>/batman-adv/no_rebroadcast
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++Date: Sep 2013
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++Contact: Linus Lüssing <linus.luessing@web.de>
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++Description:
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++ With this option set incoming multicast payload frames on
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++ <iface> are not being rebroadcasted on <iface> again. This
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++ option should be set on links which are known to be transitive
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++ and symmetric only, for instance point-to-point wifi longshots
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++ or wired links. Using this option wrongly is going to
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++ break your mesh network, use at your own risk!
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+diff --git a/sysfs.c b/sysfs.c
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+index 929e304..19e0930 100644
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+--- a/sysfs.c
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++++ b/sysfs.c
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+@@ -53,6 +53,17 @@ static char *batadv_uev_type_str[] = {
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+ "gw"
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+ };
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+
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++/* Use this, if you have customized show and store functions
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++ * for hard interface attrs
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++ */
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++#define BATADV_ATTR_HIF(_name, _mode, _show, _store) \
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++struct batadv_attribute batadv_attr_hif_##_name = { \
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++ .attr = {.name = __stringify(_name), \
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++ .mode = _mode }, \
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++ .show = _show, \
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++ .store = _store, \
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++};
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++
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+ /* Use this, if you have customized show and store functions */
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+ #define BATADV_ATTR(_name, _mode, _show, _store) \
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+ struct batadv_attribute batadv_attr_##_name = { \
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+@@ -123,6 +134,52 @@ ssize_t batadv_show_##_name(struct kobject *kobj, \
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+ batadv_store_##_name)
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+
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+
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++#define BATADV_ATTR_HIF_STORE_BOOL(_name, _post_func) \
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++ssize_t batadv_store_hif_##_name(struct kobject *kobj, \
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++ struct attribute *attr, char *buff, \
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++ size_t count) \
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++{ \
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++ struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \
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++ struct batadv_hard_iface *hard_iface; \
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++ size_t res; \
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++ \
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++ hard_iface = batadv_hardif_get_by_netdev(net_dev); \
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++ if (!hard_iface) \
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++ return 0; \
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++ \
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++ res = __batadv_store_bool_attr(buff, count, _post_func, \
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++ attr, &hard_iface->_name, \
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++ hard_iface->soft_iface); \
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++ batadv_hardif_free_ref(hard_iface); \
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++ return res; \
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++}
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++
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++#define BATADV_ATTR_HIF_SHOW_BOOL(_name) \
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++ssize_t batadv_show_hif_##_name(struct kobject *kobj, \
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++ struct attribute *attr, char *buff) \
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++{ \
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++ struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \
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++ struct batadv_hard_iface *hard_iface; \
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++ size_t res; \
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++ \
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++ hard_iface = batadv_hardif_get_by_netdev(net_dev); \
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++ if (!hard_iface) \
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++ return 0; \
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++ \
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++ res = sprintf(buff, "%s\n", \
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++ atomic_read(&hard_iface->_name) == 0 ? \
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++ "disabled" : "enabled"); \
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++ batadv_hardif_free_ref(hard_iface); \
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++ return res; \
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++}
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++
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++/* Use this, if you are going to turn a [name] in the vlan struct on or off */
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++#define BATADV_ATTR_HIF_BOOL(_name, _mode, _post_func) \
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++ static BATADV_ATTR_HIF_STORE_BOOL(_name, _post_func) \
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++ static BATADV_ATTR_HIF_SHOW_BOOL(_name) \
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++ static BATADV_ATTR_HIF(_name, _mode, batadv_show_hif_##_name, \
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++ batadv_store_hif_##_name)
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++
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+ static int batadv_store_bool_attr(char *buff, size_t count,
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+ struct net_device *net_dev,
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+ const char *attr_name, atomic_t *attr)
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+@@ -642,10 +699,12 @@ static ssize_t batadv_show_iface_status(struct kobject *kobj,
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+ static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
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+ batadv_store_mesh_iface);
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+ static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
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++BATADV_ATTR_HIF_BOOL(no_rebroadcast, S_IRUGO | S_IWUSR, NULL);
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+
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+ static struct batadv_attribute *batadv_batman_attrs[] = {
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+ &batadv_attr_mesh_iface,
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+ &batadv_attr_iface_status,
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++ &batadv_attr_hif_no_rebroadcast,
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+ NULL,
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+ };
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+
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+diff --git a/types.h b/types.h
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+index b2c94e1..d1e1bb9 100644
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+--- a/types.h
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++++ b/types.h
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+@@ -85,6 +85,7 @@ struct batadv_hard_iface {
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+ struct rcu_head rcu;
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+ struct batadv_hard_iface_bat_iv bat_iv;
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+ struct work_struct cleanup_work;
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++ atomic_t no_rebroadcast;
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+ };
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+
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+ /**
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+--
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+1.7.10.4
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+
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