From: Antonio Quartulli antonio@open-mesh.com
Each VLAN can now have its own set of attributes. Export them through a new subfolder in the sysfs tree. Each VLAN created on top of a soft_iface will have its own subfolder.
The subfolder is named "vlan%VID" and it is created inside the "mesh" sysfs folder belonging to batman-adv.
Since the fake-VLAN representing the standalone soft_iface has no real vid, its subfolder is named "novlan".
Create all the needed macros and data structures to easily handle new VLAN spacific attributes.
Signed-off-by: Antonio Quartulli antonio@open-mesh.com ---
v5: - added description for "novlan" subfolder in the commit message - "novlan" folder introduction has been correctly merged into this patch
soft-interface.c | 7 +++ sysfs.c | 142 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ sysfs.h | 10 ++++ 3 files changed, 159 insertions(+)
diff --git a/soft-interface.c b/soft-interface.c index f7552c5..c866933 100644 --- a/soft-interface.c +++ b/soft-interface.c @@ -434,6 +434,7 @@ batadv_softif_vlan_get(struct batadv_priv *bat_priv, unsigned short vid) int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) { struct batadv_softif_vlan *vlan; + int err;
vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); if (!vlan) @@ -449,6 +450,10 @@ int batadv_softif_create_vlan(struct batadv_priv *bat_priv, unsigned short vid) bat_priv->soft_iface->dev_addr, vid, BATADV_NULL_IFINDEX);
+ err = batadv_sysfs_add_vlan(bat_priv->soft_iface, vlan); + if (err) + return err; + spin_lock_bh(&bat_priv->softif_vlan_list_lock); list_add_rcu(&vlan->list, &bat_priv->softif_vlan_list); spin_unlock_bh(&bat_priv->softif_vlan_list_lock); @@ -512,6 +517,8 @@ static int batadv_interface_kill_vid(struct net_device *dev, __be16 proto, list_del_rcu(&vlan->list); spin_unlock_bh(&bat_priv->softif_vlan_list_lock);
+ batadv_sysfs_del_vlan(bat_priv, vlan); + /* explicitly remove the associated TT local entry because it is marked * with the NOPURGE flag */ diff --git a/sysfs.c b/sysfs.c index b70ae52..32bdc46 100644 --- a/sysfs.c +++ b/sysfs.c @@ -39,6 +39,31 @@ static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj) return netdev_priv(net_dev); }
+/** + * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct + * @obj: kobject to covert + * + * Return the associated softif_vlan struct if cound, NULL otherwise + */ +static struct batadv_softif_vlan *batadv_kobj_to_vlan(struct kobject *obj) +{ + struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(obj->parent); + struct batadv_softif_vlan *vlan, *vlan_tmp = NULL; + + list_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) { + if (vlan->kobj != obj) + continue; + + if (!atomic_inc_not_zero(&vlan->refcount)) + continue; + + vlan_tmp = vlan; + break; + } + + return vlan_tmp; +} + #define BATADV_UEV_TYPE_VAR "BATTYPE=" #define BATADV_UEV_ACTION_VAR "BATACTION=" #define BATADV_UEV_DATA_VAR "BATDATA=" @@ -53,6 +78,15 @@ static char *batadv_uev_type_str[] = { "gw" };
+/* Use this, if you have customized show and store functions for vlan attrs */ +#define BATADV_ATTR_VLAN(_name, _mode, _show, _store) \ +struct batadv_attribute batadv_attr_vlan_##_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 = { \ @@ -122,6 +156,38 @@ ssize_t batadv_show_##_name(struct kobject *kobj, \ static BATADV_ATTR(_name, _mode, batadv_show_##_name, \ batadv_store_##_name)
+#define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func) \ +ssize_t batadv_store_vlan_##_name(struct kobject *kobj, \ + struct attribute *attr, char *buff, \ + size_t count) \ +{ \ + struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj->parent);\ + struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(kobj); \ + size_t res = __batadv_store_bool_attr(buff, count, _post_func, attr,\ + &vlan->_name, \ + bat_priv->soft_iface); \ + batadv_softif_vlan_free_ref(vlan); \ + return res; \ +} + +#define BATADV_ATTR_VLAN_SHOW_BOOL(_name) \ +ssize_t batadv_show_vlan_##_name(struct kobject *kobj, \ + struct attribute *attr, char *buff) \ +{ \ + struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(kobj); \ + size_t res = sprintf(buff, "%s\n", \ + atomic_read(&vlan->_name) == 0 ? \ + "disabled" : "enabled"); \ + batadv_softif_vlan_free_ref(vlan); \ + return res; \ +} + +/* Use this, if you are going to turn a [name] in the vlan struct on or off */ +#define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func) \ + static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func) \ + static BATADV_ATTR_VLAN_SHOW_BOOL(_name) \ + static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \ + batadv_store_vlan_##_name)
static int batadv_store_bool_attr(char *buff, size_t count, struct net_device *net_dev, @@ -403,6 +469,13 @@ static struct batadv_attribute *batadv_mesh_attrs[] = { NULL, };
+/** + * batadv_vlan_attrs - array of vlan specific sysfs attributes + */ +static struct batadv_attribute *batadv_vlan_attrs[] = { + NULL, +}; + int batadv_sysfs_add_meshif(struct net_device *dev) { struct kobject *batif_kobject = &dev->dev.kobj; @@ -453,6 +526,75 @@ void batadv_sysfs_del_meshif(struct net_device *dev) bat_priv->mesh_obj = NULL; }
+/** + * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan + * @dev: netdev of the mesh interface + * @vlan: private data of the newly added VLAN interface + * + * Return 0 on success and -ENOMEM if any of the structure allocations fails + */ +int batadv_sysfs_add_vlan(struct net_device *dev, + struct batadv_softif_vlan *vlan) +{ + struct batadv_priv *bat_priv = netdev_priv(dev); + struct batadv_attribute **bat_attr; + char vlan_subdir_str[256], *vlan_subdir; + int err; + + vlan_subdir = "novlan"; + if (vlan->vid & BATADV_VLAN_HAS_TAG) { + sprintf(vlan_subdir_str, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%u", + vlan->vid & VLAN_VID_MASK); + vlan_subdir = vlan_subdir_str; + } + + vlan->kobj = kobject_create_and_add(vlan_subdir, bat_priv->mesh_obj); + if (!vlan->kobj) { + batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name, + vlan_subdir); + goto out; + } + + for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) { + err = sysfs_create_file(vlan->kobj, + &((*bat_attr)->attr)); + if (err) { + batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n", + dev->name, vlan_subdir, + ((*bat_attr)->attr).name); + goto rem_attr; + } + } + + return 0; + +rem_attr: + for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) + sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr)); + + kobject_put(vlan->kobj); + vlan->kobj = NULL; +out: + return -ENOMEM; +} + +/** + * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN + * @bat_priv: the bat priv with all the soft interface information + * @vlan: the private data of the VLAN to destroy + */ +void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan) +{ + struct batadv_attribute **bat_attr; + + for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) + sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr)); + + kobject_put(vlan->kobj); + vlan->kobj = NULL; +} + static ssize_t batadv_show_mesh_iface(struct kobject *kobj, struct attribute *attr, char *buff) { diff --git a/sysfs.h b/sysfs.h index 479acf4..c4f96c1 100644 --- a/sysfs.h +++ b/sysfs.h @@ -22,6 +22,12 @@
#define BATADV_SYSFS_IF_MESH_SUBDIR "mesh" #define BATADV_SYSFS_IF_BAT_SUBDIR "batman_adv" +/** + * BATADV_SYSFS_VLAN_SUBDIR_PREFIX - prefix of the subfolder that will be + * created in the sysfs hierarchy for each VLAN interface. The subfolder will + * be named "BATADV_SYSFS_VLAN_SUBDIR_PREFIX%vid" + */ +#define BATADV_SYSFS_VLAN_SUBDIR_PREFIX "vlan"
struct batadv_attribute { struct attribute attr; @@ -36,6 +42,10 @@ void batadv_sysfs_del_meshif(struct net_device *dev); int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev); void batadv_sysfs_del_hardif(struct kobject **hardif_obj); +int batadv_sysfs_add_vlan(struct net_device *dev, + struct batadv_softif_vlan *vlan); +void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv, + struct batadv_softif_vlan *vlan); int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type, enum batadv_uev_action action, const char *data);