[B.A.T.M.A.N.] Patch to add mesh_no_rebroadcast

Ruben Wisniewski
2015-05-16T20:07:36Z

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Signed-off-by: Linus Lüssing <linus.luessing@web.de>
---
hard-interface.c | 2 ++
send.c | 4 ++++
sysfs-class-net-batman-adv | 10 ++++++++
sysfs.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++
types.h | 1 +
5 files changed, 76 insertions(+)

diff --git a/hard-interface.c b/hard-interface.c
index fbda6b5..3997f9c 100644
--- a/hard-interface.c
+++ b/hard-interface.c
@@ -591,6 +591,8 @@ batadv_hardif_add_interface(struct net_device *net_dev)
/* extra reference for return */
atomic_set(&hard_iface->refcount, 2);

+ 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/send.c b/send.c
index d27161e..4383a66 100644
--- a/send.c
+++ b/send.c
@@ -513,6 +513,10 @@ 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;
+
/* send a copy of the saved skb */
skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
if (skb1)
diff --git a/sysfs-class-net-batman-adv b/sysfs-class-net-batman-adv
index 7f34a95..cf7fe00 100644
--- a/sysfs-class-net-batman-adv
+++ b/sysfs-class-net-batman-adv
@@ -13,3 +13,13 @@ Description:
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/sysfs.c b/sysfs.c
index fc47baa..adaeca4 100644
--- a/sysfs.c
+++ b/sysfs.c
@@ -110,6 +110,17 @@ 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 = { \
@@ -221,6 +232,52 @@ ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \
static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
batadv_store_vlan_##_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_free_ref(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_free_ref(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)
@@ -844,10 +901,12 @@ static ssize_t batadv_show_iface_status(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);

static struct batadv_attribute *batadv_batman_attrs[] = {
&batadv_attr_mesh_iface,
&batadv_attr_iface_status,
+ &batadv_attr_hif_no_rebroadcast,
NULL,
};

diff --git a/types.h b/types.h
index 8854c05..39619fb 100644
--- a/types.h
+++ b/types.h
@@ -101,6 +101,7 @@ struct batadv_hard_iface {
struct batadv_hard_iface_bat_iv bat_iv;
struct work_struct cleanup_work;
struct dentry *debug_dir;
+ atomic_t no_rebroadcast;
};

/**
--
2.1.3

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