From: Andrew Lunn <[email protected]> Unlike sysfs, debugfs is not netns aware. So batman has to take care to avoid namespace clashes.
Each namespace is given a directory within debugfs/batman-adv/netns, using the namespaces inum as the directory name. Files for namespaces other than the global namespace are placed within the namespace specific directory. Additionally, a symbolic link is used to link the global namespaces inum back to debugfs/batman-adv/ so tools do not need to differentiate between the global namespace and other namespaces. Signed-off-by: Andrew Lunn <[email protected]> Signed-off-by: Sven Eckelmann <[email protected]> --- compat-patches/0002-ns.inum.patch | 25 ++++++++ net/batman-adv/debugfs.c | 130 +++++++++++++++++++++++++++++++++++++- 2 files changed, 152 insertions(+), 3 deletions(-) create mode 100644 compat-patches/0002-ns.inum.patch diff --git a/compat-patches/0002-ns.inum.patch b/compat-patches/0002-ns.inum.patch new file mode 100644 index 0000000..9856f6e --- /dev/null +++ b/compat-patches/0002-ns.inum.patch @@ -0,0 +1,25 @@ +From: Sven Eckelmann <[email protected]> +Date: Sat, 12 Mar 2016 00:24:58 +0100 +Subject: [PATCH] ns.inum +--- + net/batman-adv/debugfs.c | 6 ++++++ + 1 file changed, 6 insertions(+) + +diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c +index cc583e6..59616a6 100644 +--- a/net/batman-adv/debugfs.c ++++ b/net/batman-adv/debugfs.c +@@ -78,7 +78,13 @@ static DEFINE_MUTEX(batadv_debugfs_ns_mutex); + */ + static unsigned int batadv_debugfs_ns_id(const struct net *net) + { ++#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 8, 0) ++ return 0; /* ???? */ ++#elif LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0) ++ return net->proc_inum; ++#else + return net->ns.inum; ++#endif + } + + static struct dentry *batadv_debugfs_ns_get(struct net *net) diff --git a/net/batman-adv/debugfs.c b/net/batman-adv/debugfs.c index 3dc5208..cc583e6 100644 --- a/net/batman-adv/debugfs.c +++ b/net/batman-adv/debugfs.c @@ -27,8 +27,12 @@ #include <linux/fs.h> #include <linux/jiffies.h> #include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/netdevice.h> +#include <linux/ns_common.h> #include <linux/poll.h> #include <linux/printk.h> #include <linux/sched.h> /* for linux/wait.h */ @@ -42,6 +46,7 @@ #include <linux/types.h> #include <linux/uaccess.h> #include <linux/wait.h> +#include <net/net_namespace.h> #include <stdarg.h> #include "bridge_loop_avoidance.h" @@ -53,6 +58,84 @@ #include "translation-table.h" static struct dentry *batadv_debugfs; +static struct dentry *batadv_ns_debugfs; + +struct batadv_debugfs_ns_entry { + struct net *net; + struct dentry *dir; + struct kref refcount; + struct list_head link; +}; + +static LIST_HEAD(batadv_debugfs_ns); +static DEFINE_MUTEX(batadv_debugfs_ns_mutex); + +/** + * batadv_debugfs_ns_id - Get namespace specific id + * @net: namespace of the soft-interface + * + * Return: internal id of the namespace + */ +static unsigned int batadv_debugfs_ns_id(const struct net *net) +{ + return net->ns.inum; +} + +static struct dentry *batadv_debugfs_ns_get(struct net *net) +{ + struct batadv_debugfs_ns_entry *ns_entry; + char name[32]; + + mutex_lock(&batadv_debugfs_ns_mutex); + list_for_each_entry(ns_entry, &batadv_debugfs_ns, link) { + if (ns_entry->net == net) { + kref_get(&ns_entry->refcount); + mutex_unlock(&batadv_debugfs_ns_mutex); + return ns_entry->dir; + } + } + + ns_entry = kzalloc(sizeof(*ns_entry), GFP_ATOMIC); + if (ns_entry) { + INIT_LIST_HEAD(&ns_entry->link); + ns_entry->net = net; + kref_init(&ns_entry->refcount); + sprintf(name, "%u", batadv_debugfs_ns_id(net)); + ns_entry->dir = debugfs_create_dir(name, batadv_ns_debugfs); + if (!ns_entry->dir) { + kfree(ns_entry); + mutex_unlock(&batadv_debugfs_ns_mutex); + return NULL; + } + list_add(&ns_entry->link, &batadv_debugfs_ns); + } + mutex_unlock(&batadv_debugfs_ns_mutex); + return ns_entry->dir; +} + +static void batadv_ns_entry_release(struct kref *ref) +{ + struct batadv_debugfs_ns_entry *ns_entry; + + ns_entry = container_of(ref, struct batadv_debugfs_ns_entry, refcount); + debugfs_remove_recursive(ns_entry->dir); + list_del(&ns_entry->link); + kfree(ns_entry); +} + +static void batadv_debugfs_ns_put(struct net *net) +{ + struct batadv_debugfs_ns_entry *ns_entry; + + mutex_lock(&batadv_debugfs_ns_mutex); + list_for_each_entry(ns_entry, &batadv_debugfs_ns, link) { + if (ns_entry->net == net) { + kref_put(&ns_entry->refcount, batadv_ns_entry_release); + break; + } + } + mutex_unlock(&batadv_debugfs_ns_mutex); +} #ifdef CONFIG_BATMAN_ADV_DEBUG #define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1) @@ -451,6 +534,7 @@ void batadv_debugfs_init(void) { struct batadv_debuginfo **bat_debug; struct dentry *file; + char name[32]; batadv_debugfs = debugfs_create_dir(BATADV_DEBUGFS_SUBDIR, NULL); if (batadv_debugfs == ERR_PTR(-ENODEV)) @@ -471,6 +555,15 @@ void batadv_debugfs_init(void) } } + batadv_ns_debugfs = debugfs_create_dir("netns", batadv_debugfs); + if (!batadv_ns_debugfs) + goto err; + + /* Create a symlink for the default name space */ + sprintf(name, "%u", batadv_debugfs_ns_id(&init_net)); + if (!debugfs_create_symlink(name, batadv_ns_debugfs, "..")) + goto err; + return; err: debugfs_remove_recursive(batadv_debugfs); @@ -492,14 +585,24 @@ void batadv_debugfs_destroy(void) */ int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface) { + struct net *net = dev_net(hard_iface->net_dev); + char *name = hard_iface->net_dev->name; struct batadv_debuginfo **bat_debug; + struct dentry *debugfs_ns_dir; struct dentry *file; if (!batadv_debugfs) goto out; - hard_iface->debug_dir = debugfs_create_dir(hard_iface->net_dev->name, - batadv_debugfs); + debugfs_ns_dir = batadv_debugfs; + + if (net != &init_net) { + debugfs_ns_dir = batadv_debugfs_ns_get(net); + if (!debugfs_ns_dir) + goto out; + } + + hard_iface->debug_dir = debugfs_create_dir(name, debugfs_ns_dir); if (!hard_iface->debug_dir) goto out; @@ -517,6 +620,8 @@ int batadv_debugfs_add_hardif(struct batadv_hard_iface *hard_iface) rem_attr: debugfs_remove_recursive(hard_iface->debug_dir); hard_iface->debug_dir = NULL; + if (net != &init_net) + batadv_debugfs_ns_put(net); out: return -ENOMEM; } @@ -528,22 +633,36 @@ out: */ void batadv_debugfs_del_hardif(struct batadv_hard_iface *hard_iface) { + struct net *net = dev_net(hard_iface->net_dev); + if (batadv_debugfs) { debugfs_remove_recursive(hard_iface->debug_dir); hard_iface->debug_dir = NULL; } + if (net != &init_net) + batadv_debugfs_ns_put(net); } int batadv_debugfs_add_meshif(struct net_device *dev) { struct batadv_priv *bat_priv = netdev_priv(dev); struct batadv_debuginfo **bat_debug; + struct net *net = dev_net(dev); + struct dentry *debugfs_ns_dir; struct dentry *file; if (!batadv_debugfs) goto out; - bat_priv->debug_dir = debugfs_create_dir(dev->name, batadv_debugfs); + debugfs_ns_dir = batadv_debugfs; + + if (net != &init_net) { + debugfs_ns_dir = batadv_debugfs_ns_get(net); + if (!debugfs_ns_dir) + goto out; + } + + bat_priv->debug_dir = debugfs_create_dir(dev->name, debugfs_ns_dir); if (!bat_priv->debug_dir) goto out; @@ -572,6 +691,8 @@ int batadv_debugfs_add_meshif(struct net_device *dev) rem_attr: debugfs_remove_recursive(bat_priv->debug_dir); bat_priv->debug_dir = NULL; + if (net != &init_net) + batadv_debugfs_ns_put(net); out: return -ENOMEM; } @@ -579,6 +700,7 @@ out: void batadv_debugfs_del_meshif(struct net_device *dev) { struct batadv_priv *bat_priv = netdev_priv(dev); + struct net *net = dev_net(dev); batadv_debug_log_cleanup(bat_priv); @@ -586,4 +708,6 @@ void batadv_debugfs_del_meshif(struct net_device *dev) debugfs_remove_recursive(bat_priv->debug_dir); bat_priv->debug_dir = NULL; } + if (net != &init_net) + batadv_debugfs_ns_put(net); } -- 2.7.0
