forked from freifunk-franken/firmware
195 lines
7.2 KiB
Diff
195 lines
7.2 KiB
Diff
From 3abc4d782dcbf7814646e03d73bd509181a1ccd1 Mon Sep 17 00:00:00 2001
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From: Tim Niemeyer <tim.niemeyer@mastersword.de>
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Date: Fri, 22 Nov 2013 18:59:26 +0100
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Subject: [PATCH] batman-adv: no rebroadcast option
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---
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...man-adv_introduce__no_rebroadcast__option.patch | 176 ++++++++++++++++++++
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1 file changed, 176 insertions(+)
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create mode 100644 batman-adv/patches/0002-batman-adv_introduce__no_rebroadcast__option.patch
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diff --git a/batman-adv/patches/0002-batman-adv_introduce__no_rebroadcast__option.patch b/batman-adv/patches/0002-batman-adv_introduce__no_rebroadcast__option.patch
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new file mode 100644
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index 0000000..57d8491
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--- /dev/null
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+++ b/batman-adv/patches/0002-batman-adv_introduce__no_rebroadcast__option.patch
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@@ -0,0 +1,176 @@
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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 L<>ssing <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 c60d3ed..4c27f05 100644
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+--- a/hard-interface.c
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++++ b/hard-interface.c
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+@@ -602,6 +602,8 @@ 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 c83be5e..2a0e0cc 100644
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+--- a/send.c
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++++ b/send.c
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+@@ -496,6 +496,10 @@ 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 L<>ssing <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 096b511..5e2cd21 100644
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+--- a/sysfs.c
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++++ b/sysfs.c
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+@@ -110,6 +110,17 @@ struct batadv_attribute batadv_attr_vlan_##_name = { \
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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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++ * 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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+@@ -215,6 +226,52 @@ ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \
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+ static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
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+ batadv_store_vlan_##_name)
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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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+@@ -750,10 +807,12 @@ 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 f323822..b5a5824 100644
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+--- a/types.h
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++++ b/types.h
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+@@ -76,6 +76,7 @@ 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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--
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1.7.10.4
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