net: Add batman-adv meshing protocol

B.A.T.M.A.N. (better approach to mobile ad-hoc networking) is a routing
protocol for multi-hop ad-hoc mesh networks. The networks may be wired or
wireless. See http://www.open-mesh.org/ for more information and user space
tools.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 593 insertions, 0 deletions

diff --git a/net/batman-adv/bat_sysfs.c b/net/batman-adv/bat_sysfs.c
new file mode 100644
index 000000000000..cd7bb51825f1
--- /dev/null
+++ b/net/batman-adv/bat_sysfs.c
@@ -0,0 +1,593 @@
+/*
+ * Copyright (C) 2010 B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA
+ *
+ */
+
+#include "main.h"
+#include "bat_sysfs.h"
+#include "translation-table.h"
+#include "originator.h"
+#include "hard-interface.h"
+#include "gateway_common.h"
+#include "gateway_client.h"
+#include "vis.h"
+
+#define to_dev(obj)             container_of(obj, struct device, kobj)
+#define kobj_to_netdev(obj)     to_net_dev(to_dev(obj->parent))
+#define kobj_to_batpriv(obj)    netdev_priv(kobj_to_netdev(obj))
+
+/* Use this, if you have customized show and store functions */
+#define BAT_ATTR(_name, _mode, _show, _store)   \
+struct bat_attribute bat_attr_##_name = {       \
+        .attr = {.name = __stringify(_name),    \
+                 .mode = _mode },               \
+        .show   = _show,                        \
+        .store  = _store,                       \
+};
+
+#define BAT_ATTR_STORE_BOOL(_name, _post_func)                          \
+ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
+                      char *buff, size_t count)                         \
+{                                                                       \
+        struct net_device *net_dev = kobj_to_netdev(kobj);              \
+        struct bat_priv *bat_priv = netdev_priv(net_dev);               \
+        return __store_bool_attr(buff, count, _post_func, attr,         \
+                                 &bat_priv->_name, net_dev);            \
+}
+
+#define BAT_ATTR_SHOW_BOOL(_name)                                       \
+ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
+                            char *buff)                                 \
+{                                                                       \
+        struct bat_priv *bat_priv = kobj_to_batpriv(kobj);              \
+        return sprintf(buff, "%s\n",                                    \
+                       atomic_read(&bat_priv->_name) == 0 ?             \
+                       "disabled" : "enabled");                         \
+}                                                                       \
+
+/* Use this, if you are going to turn a [name] in bat_priv on or off */
+#define BAT_ATTR_BOOL(_name, _mode, _post_func)                         \
+        static BAT_ATTR_STORE_BOOL(_name, _post_func)                   \
+        static BAT_ATTR_SHOW_BOOL(_name)                                \
+        static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
+
+
+#define BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)              \
+ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
+                             char *buff, size_t count)                  \
+{                                                                       \
+        struct net_device *net_dev = kobj_to_netdev(kobj);              \
+        struct bat_priv *bat_priv = netdev_priv(net_dev);               \
+        return __store_uint_attr(buff, count, _min, _max, _post_func,   \
+                                 attr, &bat_priv->_name, net_dev);      \
+}
+
+#define BAT_ATTR_SHOW_UINT(_name)                                       \
+ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
+                            char *buff)                                 \
+{                                                                       \
+        struct bat_priv *bat_priv = kobj_to_batpriv(kobj);              \
+        return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name));    \
+}                                                                       \
+
+/* Use this, if you are going to set [name] in bat_priv to unsigned integer
+ * values only */
+#define BAT_ATTR_UINT(_name, _mode, _min, _max, _post_func)             \
+        static BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)       \
+        static BAT_ATTR_SHOW_UINT(_name)                                \
+        static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
+
+
+static int store_bool_attr(char *buff, size_t count,
+                           struct net_device *net_dev,
+                           char *attr_name, atomic_t *attr)
+{
+        int enabled = -1;
+
+        if (buff[count - 1] == '\n')
+                buff[count - 1] = '\0';
+
+        if ((strncmp(buff, "1", 2) == 0) ||
+            (strncmp(buff, "enable", 7) == 0) ||
+            (strncmp(buff, "enabled", 8) == 0))
+                enabled = 1;
+
+        if ((strncmp(buff, "0", 2) == 0) ||
+            (strncmp(buff, "disable", 8) == 0) ||
+            (strncmp(buff, "disabled", 9) == 0))
+                enabled = 0;
+
+        if (enabled < 0) {
+                bat_info(net_dev,
+                         "%s: Invalid parameter received: %s\n",
+                         attr_name, buff);
+                return -EINVAL;
+        }
+
+        if (atomic_read(attr) == enabled)
+                return count;
+
+        bat_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
+                 atomic_read(attr) == 1 ? "enabled" : "disabled",
+                 enabled == 1 ? "enabled" : "disabled");
+
+        atomic_set(attr, (unsigned)enabled);
+        return count;
+}
+
+static inline ssize_t __store_bool_attr(char *buff, size_t count,
+                        void (*post_func)(struct net_device *),
+                        struct attribute *attr,
+                        atomic_t *attr_store, struct net_device *net_dev)
+{
+        int ret;
+
+        ret = store_bool_attr(buff, count, net_dev, (char *)attr->name,
+                              attr_store);
+        if (post_func && ret)
+                post_func(net_dev);
+
+        return ret;
+}
+
+static int store_uint_attr(char *buff, size_t count,
+                           struct net_device *net_dev, char *attr_name,
+                           unsigned int min, unsigned int max, atomic_t *attr)
+{
+        unsigned long uint_val;
+        int ret;
+
+        ret = strict_strtoul(buff, 10, &uint_val);
+        if (ret) {
+                bat_info(net_dev,
+                         "%s: Invalid parameter received: %s\n",
+                         attr_name, buff);
+                return -EINVAL;
+        }
+
+        if (uint_val < min) {
+                bat_info(net_dev, "%s: Value is too small: %lu min: %u\n",
+                         attr_name, uint_val, min);
+                return -EINVAL;
+        }
+
+        if (uint_val > max) {
+                bat_info(net_dev, "%s: Value is too big: %lu max: %u\n",
+                         attr_name, uint_val, max);
+                return -EINVAL;
+        }
+
+        if (atomic_read(attr) == uint_val)
+                return count;
+
+        bat_info(net_dev, "%s: Changing from: %i to: %lu\n",
+                 attr_name, atomic_read(attr), uint_val);
+
+        atomic_set(attr, uint_val);
+        return count;
+}
+
+static inline ssize_t __store_uint_attr(char *buff, size_t count,
+                        int min, int max,
+                        void (*post_func)(struct net_device *),
+                        struct attribute *attr,
+                        atomic_t *attr_store, struct net_device *net_dev)
+{
+        int ret;
+
+        ret = store_uint_attr(buff, count, net_dev, (char *)attr->name,
+                              min, max, attr_store);
+        if (post_func && ret)
+                post_func(net_dev);
+
+        return ret;
+}
+
+static ssize_t show_vis_mode(struct kobject *kobj, struct attribute *attr,
+                             char *buff)
+{
+        struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+        int vis_mode = atomic_read(&bat_priv->vis_mode);
+
+        return sprintf(buff, "%s\n",
+                       vis_mode == VIS_TYPE_CLIENT_UPDATE ?
+                                                        "client" : "server");
+}
+
+static ssize_t store_vis_mode(struct kobject *kobj, struct attribute *attr,
+                              char *buff, size_t count)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+        struct bat_priv *bat_priv = netdev_priv(net_dev);
+        unsigned long val;
+        int ret, vis_mode_tmp = -1;
+
+        ret = strict_strtoul(buff, 10, &val);
+
+        if (((count == 2) && (!ret) && (val == VIS_TYPE_CLIENT_UPDATE)) ||
+            (strncmp(buff, "client", 6) == 0) ||
+            (strncmp(buff, "off", 3) == 0))
+                vis_mode_tmp = VIS_TYPE_CLIENT_UPDATE;
+
+        if (((count == 2) && (!ret) && (val == VIS_TYPE_SERVER_SYNC)) ||
+            (strncmp(buff, "server", 6) == 0))
+                vis_mode_tmp = VIS_TYPE_SERVER_SYNC;
+
+        if (vis_mode_tmp < 0) {
+                if (buff[count - 1] == '\n')
+                        buff[count - 1] = '\0';
+
+                bat_info(net_dev,
+                         "Invalid parameter for 'vis mode' setting received: "
+                         "%s\n", buff);
+                return -EINVAL;
+        }
+
+        if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
+                return count;
+
+        bat_info(net_dev, "Changing vis mode from: %s to: %s\n",
+                 atomic_read(&bat_priv->vis_mode) == VIS_TYPE_CLIENT_UPDATE ?
+                 "client" : "server", vis_mode_tmp == VIS_TYPE_CLIENT_UPDATE ?
+                 "client" : "server");
+
+        atomic_set(&bat_priv->vis_mode, (unsigned)vis_mode_tmp);
+        return count;
+}
+
+static void post_gw_deselect(struct net_device *net_dev)
+{
+        struct bat_priv *bat_priv = netdev_priv(net_dev);
+        gw_deselect(bat_priv);
+}
+
+static ssize_t show_gw_mode(struct kobject *kobj, struct attribute *attr,
+                            char *buff)
+{
+        struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+        int bytes_written;
+
+        switch (atomic_read(&bat_priv->gw_mode)) {
+        case GW_MODE_CLIENT:
+                bytes_written = sprintf(buff, "%s\n", GW_MODE_CLIENT_NAME);
+                break;
+        case GW_MODE_SERVER:
+                bytes_written = sprintf(buff, "%s\n", GW_MODE_SERVER_NAME);
+                break;
+        default:
+                bytes_written = sprintf(buff, "%s\n", GW_MODE_OFF_NAME);
+                break;
+        }
+
+        return bytes_written;
+}
+
+static ssize_t store_gw_mode(struct kobject *kobj, struct attribute *attr,
+                             char *buff, size_t count)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+        struct bat_priv *bat_priv = netdev_priv(net_dev);
+        char *curr_gw_mode_str;
+        int gw_mode_tmp = -1;
+
+        if (buff[count - 1] == '\n')
+                buff[count - 1] = '\0';
+
+        if (strncmp(buff, GW_MODE_OFF_NAME, strlen(GW_MODE_OFF_NAME)) == 0)
+                gw_mode_tmp = GW_MODE_OFF;
+
+        if (strncmp(buff, GW_MODE_CLIENT_NAME,
+                   strlen(GW_MODE_CLIENT_NAME)) == 0)
+                gw_mode_tmp = GW_MODE_CLIENT;
+
+        if (strncmp(buff, GW_MODE_SERVER_NAME,
+                   strlen(GW_MODE_SERVER_NAME)) == 0)
+                gw_mode_tmp = GW_MODE_SERVER;
+
+        if (gw_mode_tmp < 0) {
+                bat_info(net_dev,
+                         "Invalid parameter for 'gw mode' setting received: "
+                         "%s\n", buff);
+                return -EINVAL;
+        }
+
+        if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
+                return count;
+
+        switch (atomic_read(&bat_priv->gw_mode)) {
+        case GW_MODE_CLIENT:
+                curr_gw_mode_str = GW_MODE_CLIENT_NAME;
+                break;
+        case GW_MODE_SERVER:
+                curr_gw_mode_str = GW_MODE_SERVER_NAME;
+                break;
+        default:
+                curr_gw_mode_str = GW_MODE_OFF_NAME;
+                break;
+        }
+
+        bat_info(net_dev, "Changing gw mode from: %s to: %s\n",
+                 curr_gw_mode_str, buff);
+
+        gw_deselect(bat_priv);
+        atomic_set(&bat_priv->gw_mode, (unsigned)gw_mode_tmp);
+        return count;
+}
+
+static ssize_t show_gw_bwidth(struct kobject *kobj, struct attribute *attr,
+                              char *buff)
+{
+        struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
+        int down, up;
+        int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
+
+        gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
+        return sprintf(buff, "%i%s/%i%s\n",
+                       (down > 2048 ? down / 1024 : down),
+                       (down > 2048 ? "MBit" : "KBit"),
+                       (up > 2048 ? up / 1024 : up),
+                       (up > 2048 ? "MBit" : "KBit"));
+}
+
+static ssize_t store_gw_bwidth(struct kobject *kobj, struct attribute *attr,
+                               char *buff, size_t count)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+
+        if (buff[count - 1] == '\n')
+                buff[count - 1] = '\0';
+
+        return gw_bandwidth_set(net_dev, buff, count);
+}
+
+BAT_ATTR_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
+BAT_ATTR_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
+BAT_ATTR_BOOL(fragmentation, S_IRUGO | S_IWUSR, update_min_mtu);
+static BAT_ATTR(vis_mode, S_IRUGO | S_IWUSR, show_vis_mode, store_vis_mode);
+static BAT_ATTR(gw_mode, S_IRUGO | S_IWUSR, show_gw_mode, store_gw_mode);
+BAT_ATTR_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * JITTER, INT_MAX, NULL);
+BAT_ATTR_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, TQ_MAX_VALUE, NULL);
+BAT_ATTR_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, TQ_MAX_VALUE,
+              post_gw_deselect);
+static BAT_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, show_gw_bwidth,
+                store_gw_bwidth);
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+BAT_ATTR_UINT(log_level, S_IRUGO | S_IWUSR, 0, 3, NULL);
+#endif
+
+static struct bat_attribute *mesh_attrs[] = {
+        &bat_attr_aggregated_ogms,
+        &bat_attr_bonding,
+        &bat_attr_fragmentation,
+        &bat_attr_vis_mode,
+        &bat_attr_gw_mode,
+        &bat_attr_orig_interval,
+        &bat_attr_hop_penalty,
+        &bat_attr_gw_sel_class,
+        &bat_attr_gw_bandwidth,
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+        &bat_attr_log_level,
+#endif
+        NULL,
+};
+
+int sysfs_add_meshif(struct net_device *dev)
+{
+        struct kobject *batif_kobject = &dev->dev.kobj;
+        struct bat_priv *bat_priv = netdev_priv(dev);
+        struct bat_attribute **bat_attr;
+        int err;
+
+        bat_priv->mesh_obj = kobject_create_and_add(SYSFS_IF_MESH_SUBDIR,
+                                                    batif_kobject);
+        if (!bat_priv->mesh_obj) {
+                bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
+                        SYSFS_IF_MESH_SUBDIR);
+                goto out;
+        }
+
+        for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) {
+                err = sysfs_create_file(bat_priv->mesh_obj,
+                                        &((*bat_attr)->attr));
+                if (err) {
+                        bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
+                                dev->name, SYSFS_IF_MESH_SUBDIR,
+                                ((*bat_attr)->attr).name);
+                        goto rem_attr;
+                }
+        }
+
+        return 0;
+
+rem_attr:
+        for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
+                sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
+
+        kobject_put(bat_priv->mesh_obj);
+        bat_priv->mesh_obj = NULL;
+out:
+        return -ENOMEM;
+}
+
+void sysfs_del_meshif(struct net_device *dev)
+{
+        struct bat_priv *bat_priv = netdev_priv(dev);
+        struct bat_attribute **bat_attr;
+
+        for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
+                sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
+
+        kobject_put(bat_priv->mesh_obj);
+        bat_priv->mesh_obj = NULL;
+}
+
+static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
+                               char *buff)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+        struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+        ssize_t length;
+
+        if (!batman_if)
+                return 0;
+
+        length = sprintf(buff, "%s\n", batman_if->if_status == IF_NOT_IN_USE ?
+                         "none" : batman_if->soft_iface->name);
+
+        kref_put(&batman_if->refcount, hardif_free_ref);
+
+        return length;
+}
+
+static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
+                                char *buff, size_t count)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+        struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+        int status_tmp = -1;
+        int ret;
+
+        if (!batman_if)
+                return count;
+
+        if (buff[count - 1] == '\n')
+                buff[count - 1] = '\0';
+
+        if (strlen(buff) >= IFNAMSIZ) {
+                pr_err("Invalid parameter for 'mesh_iface' setting received: "
+                       "interface name too long '%s'\n", buff);
+                kref_put(&batman_if->refcount, hardif_free_ref);
+                return -EINVAL;
+        }
+
+        if (strncmp(buff, "none", 4) == 0)
+                status_tmp = IF_NOT_IN_USE;
+        else
+                status_tmp = IF_I_WANT_YOU;
+
+        if ((batman_if->if_status == status_tmp) || ((batman_if->soft_iface) &&
+            (strncmp(batman_if->soft_iface->name, buff, IFNAMSIZ) == 0))) {
+                kref_put(&batman_if->refcount, hardif_free_ref);
+                return count;
+        }
+
+        if (status_tmp == IF_NOT_IN_USE) {
+                rtnl_lock();
+                hardif_disable_interface(batman_if);
+                rtnl_unlock();
+                kref_put(&batman_if->refcount, hardif_free_ref);
+                return count;
+        }
+
+        /* if the interface already is in use */
+        if (batman_if->if_status != IF_NOT_IN_USE) {
+                rtnl_lock();
+                hardif_disable_interface(batman_if);
+                rtnl_unlock();
+        }
+
+        ret = hardif_enable_interface(batman_if, buff);
+        kref_put(&batman_if->refcount, hardif_free_ref);
+
+        return ret;
+}
+
+static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
+                                 char *buff)
+{
+        struct net_device *net_dev = kobj_to_netdev(kobj);
+        struct batman_if *batman_if = get_batman_if_by_netdev(net_dev);
+        ssize_t length;
+
+        if (!batman_if)
+                return 0;
+
+        switch (batman_if->if_status) {
+        case IF_TO_BE_REMOVED:
+                length = sprintf(buff, "disabling\n");
+                break;
+        case IF_INACTIVE:
+                length = sprintf(buff, "inactive\n");
+                break;
+        case IF_ACTIVE:
+                length = sprintf(buff, "active\n");
+                break;
+        case IF_TO_BE_ACTIVATED:
+                length = sprintf(buff, "enabling\n");
+                break;
+        case IF_NOT_IN_USE:
+        default:
+                length = sprintf(buff, "not in use\n");
+                break;
+        }
+
+        kref_put(&batman_if->refcount, hardif_free_ref);
+
+        return length;
+}
+
+static BAT_ATTR(mesh_iface, S_IRUGO | S_IWUSR,
+                show_mesh_iface, store_mesh_iface);
+static BAT_ATTR(iface_status, S_IRUGO, show_iface_status, NULL);
+
+static struct bat_attribute *batman_attrs[] = {
+        &bat_attr_mesh_iface,
+        &bat_attr_iface_status,
+        NULL,
+};
+
+int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
+{
+        struct kobject *hardif_kobject = &dev->dev.kobj;
+        struct bat_attribute **bat_attr;
+        int err;
+
+        *hardif_obj = kobject_create_and_add(SYSFS_IF_BAT_SUBDIR,
+                                                    hardif_kobject);
+
+        if (!*hardif_obj) {
+                bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
+                        SYSFS_IF_BAT_SUBDIR);
+                goto out;
+        }
+
+        for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) {
+                err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
+                if (err) {
+                        bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
+                                dev->name, SYSFS_IF_BAT_SUBDIR,
+                                ((*bat_attr)->attr).name);
+                        goto rem_attr;
+                }
+        }
+
+        return 0;
+
+rem_attr:
+        for (bat_attr = batman_attrs; *bat_attr; ++bat_attr)
+                sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
+out:
+        return -ENOMEM;
+}
+
+void sysfs_del_hardif(struct kobject **hardif_obj)
+{
+        kobject_put(*hardif_obj);
+        *hardif_obj = NULL;
+}