linux_dsm_epyc7002/net/batman-adv/sysfs.c

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/* Copyright (C) 2010-2015 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, see <http://www.gnu.org/licenses/>.
*/
#include "sysfs.h"
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#include "main.h"
#include <linux/atomic.h>
#include <linux/compiler.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/rtnetlink.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/stringify.h>
#include "distributed-arp-table.h"
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#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
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#include "network-coding.h"
#include "packet.h"
#include "soft-interface.h"
static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
{
struct device *dev = container_of(obj->parent, struct device, kobj);
return to_net_dev(dev);
}
static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
{
struct net_device *net_dev = batadv_kobj_to_netdev(obj);
return netdev_priv(net_dev);
}
/**
* batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
* @obj: kobject to covert
*
* Returns the associated batadv_priv struct.
*/
static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
{
/* VLAN specific attributes are located in the root sysfs folder if they
* refer to the untagged VLAN..
*/
if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
return batadv_kobj_to_batpriv(obj);
/* ..while the attributes for the tagged vlans are located in
* the in the corresponding "vlan%VID" subfolder
*/
return batadv_kobj_to_batpriv(obj->parent);
}
/**
* batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
* @obj: kobject to covert
*
* Returns the associated softif_vlan struct if found, NULL otherwise.
*/
static struct batadv_softif_vlan *
batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
{
struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
rcu_read_lock();
hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
if (vlan_tmp->kobj != obj)
continue;
if (!atomic_inc_not_zero(&vlan_tmp->refcount))
continue;
vlan = vlan_tmp;
break;
}
rcu_read_unlock();
return vlan;
}
#define BATADV_UEV_TYPE_VAR "BATTYPE="
#define BATADV_UEV_ACTION_VAR "BATACTION="
#define BATADV_UEV_DATA_VAR "BATDATA="
static char *batadv_uev_action_str[] = {
"add",
"del",
"change"
};
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 = { \
.attr = {.name = __stringify(_name), \
.mode = _mode }, \
.show = _show, \
.store = _store, \
}
#define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func) \
ssize_t batadv_store_##_name(struct kobject *kobj, \
struct attribute *attr, char *buff, \
size_t count) \
{ \
struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \
struct batadv_priv *bat_priv = netdev_priv(net_dev); \
\
return __batadv_store_bool_attr(buff, count, _post_func, attr, \
&bat_priv->_name, net_dev); \
}
#define BATADV_ATTR_SIF_SHOW_BOOL(_name) \
ssize_t batadv_show_##_name(struct kobject *kobj, \
struct attribute *attr, char *buff) \
{ \
struct batadv_priv *bat_priv = batadv_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 the soft-interface
* (bat_priv) on or off
*/
#define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func) \
static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func) \
static BATADV_ATTR_SIF_SHOW_BOOL(_name) \
static BATADV_ATTR(_name, _mode, batadv_show_##_name, \
batadv_store_##_name)
#define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
ssize_t batadv_store_##_name(struct kobject *kobj, \
struct attribute *attr, char *buff, \
size_t count) \
{ \
struct net_device *net_dev = batadv_kobj_to_netdev(kobj); \
struct batadv_priv *bat_priv = netdev_priv(net_dev); \
\
return __batadv_store_uint_attr(buff, count, _min, _max, \
_post_func, attr, \
&bat_priv->_var, net_dev); \
}
#define BATADV_ATTR_SIF_SHOW_UINT(_name, _var) \
ssize_t batadv_show_##_name(struct kobject *kobj, \
struct attribute *attr, char *buff) \
{ \
struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj); \
\
return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var)); \
} \
/* Use this, if you are going to set [name] in the soft-interface
* (bat_priv) to an unsigned integer value
*/
#define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
static BATADV_ATTR_SIF_SHOW_UINT(_name, _var) \
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_vlan_kobj_to_batpriv(kobj);\
struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
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_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
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,
const 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) {
batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
attr_name, buff);
return -EINVAL;
}
if (atomic_read(attr) == enabled)
return count;
batadv_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 int)enabled);
return count;
}
static inline ssize_t
__batadv_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 = batadv_store_bool_attr(buff, count, net_dev, attr->name,
attr_store);
if (post_func && ret)
post_func(net_dev);
return ret;
}
static int batadv_store_uint_attr(const char *buff, size_t count,
struct net_device *net_dev,
const char *attr_name,
unsigned int min, unsigned int max,
atomic_t *attr)
{
unsigned long uint_val;
int ret;
ret = kstrtoul(buff, 10, &uint_val);
if (ret) {
batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
attr_name, buff);
return -EINVAL;
}
if (uint_val < min) {
batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
attr_name, uint_val, min);
return -EINVAL;
}
if (uint_val > max) {
batadv_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;
batadv_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
__batadv_store_uint_attr(const char *buff, size_t count,
int min, int max,
void (*post_func)(struct net_device *),
const struct attribute *attr,
atomic_t *attr_store, struct net_device *net_dev)
{
int ret;
ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
attr_store);
if (post_func && ret)
post_func(net_dev);
return ret;
}
static ssize_t batadv_show_bat_algo(struct kobject *kobj,
struct attribute *attr, char *buff)
{
struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
return sprintf(buff, "%s\n", bat_priv->bat_algo_ops->name);
}
static void batadv_post_gw_reselect(struct net_device *net_dev)
{
struct batadv_priv *bat_priv = netdev_priv(net_dev);
batadv_gw_reselect(bat_priv);
}
static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
char *buff)
{
struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
int bytes_written;
switch (atomic_read(&bat_priv->gw_mode)) {
case BATADV_GW_MODE_CLIENT:
bytes_written = sprintf(buff, "%s\n",
BATADV_GW_MODE_CLIENT_NAME);
break;
case BATADV_GW_MODE_SERVER:
bytes_written = sprintf(buff, "%s\n",
BATADV_GW_MODE_SERVER_NAME);
break;
default:
bytes_written = sprintf(buff, "%s\n",
BATADV_GW_MODE_OFF_NAME);
break;
}
return bytes_written;
}
static ssize_t batadv_store_gw_mode(struct kobject *kobj,
struct attribute *attr, char *buff,
size_t count)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_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, BATADV_GW_MODE_OFF_NAME,
strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
gw_mode_tmp = BATADV_GW_MODE_OFF;
if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
gw_mode_tmp = BATADV_GW_MODE_CLIENT;
if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
gw_mode_tmp = BATADV_GW_MODE_SERVER;
if (gw_mode_tmp < 0) {
batadv_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 BATADV_GW_MODE_CLIENT:
curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
break;
case BATADV_GW_MODE_SERVER:
curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
break;
default:
curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
break;
}
batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
curr_gw_mode_str, buff);
/* Invoking batadv_gw_reselect() is not enough to really de-select the
* current GW. It will only instruct the gateway client code to perform
* a re-election the next time that this is needed.
*
* When gw client mode is being switched off the current GW must be
* de-selected explicitly otherwise no GW_ADD uevent is thrown on
* client mode re-activation. This is operation is performed in
* batadv_gw_check_client_stop().
*/
batadv_gw_reselect(bat_priv);
/* always call batadv_gw_check_client_stop() before changing the gateway
* state
*/
batadv_gw_check_client_stop(bat_priv);
atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
batadv_gw_tvlv_container_update(bat_priv);
return count;
}
static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
struct attribute *attr, char *buff)
{
struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
uint32_t down, up;
down = atomic_read(&bat_priv->gw.bandwidth_down);
up = atomic_read(&bat_priv->gw.bandwidth_up);
return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
down % 10, up / 10, up % 10);
}
static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
struct attribute *attr, char *buff,
size_t count)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
if (buff[count - 1] == '\n')
buff[count - 1] = '\0';
return batadv_gw_bandwidth_set(net_dev, buff, count);
}
/**
* batadv_show_isolation_mark - print the current isolation mark/mask
* @kobj: kobject representing the private mesh sysfs directory
* @attr: the batman-adv attribute the user is interacting with
* @buff: the buffer that will contain the data to send back to the user
*
* Returns the number of bytes written into 'buff' on success or a negative
* error code in case of failure
*/
static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
struct attribute *attr, char *buff)
{
struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
bat_priv->isolation_mark_mask);
}
/**
* batadv_store_isolation_mark - parse and store the isolation mark/mask entered
* by the user
* @kobj: kobject representing the private mesh sysfs directory
* @attr: the batman-adv attribute the user is interacting with
* @buff: the buffer containing the user data
* @count: number of bytes in the buffer
*
* Returns 'count' on success or a negative error code in case of failure
*/
static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
struct attribute *attr, char *buff,
size_t count)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_priv *bat_priv = netdev_priv(net_dev);
uint32_t mark, mask;
char *mask_ptr;
/* parse the mask if it has been specified, otherwise assume the mask is
* the biggest possible
*/
mask = 0xFFFFFFFF;
mask_ptr = strchr(buff, '/');
if (mask_ptr) {
*mask_ptr = '\0';
mask_ptr++;
/* the mask must be entered in hex base as it is going to be a
* bitmask and not a prefix length
*/
if (kstrtou32(mask_ptr, 16, &mask) < 0)
return -EINVAL;
}
/* the mark can be entered in any base */
if (kstrtou32(buff, 0, &mark) < 0)
return -EINVAL;
bat_priv->isolation_mark_mask = mask;
/* erase bits not covered by the mask */
bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
batadv_info(net_dev,
"New skb mark for extended isolation: %#.8x/%#.8x\n",
bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
return count;
}
BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
#ifdef CONFIG_BATMAN_ADV_BLA
BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR, NULL);
#endif
#ifdef CONFIG_BATMAN_ADV_DAT
BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
batadv_dat_status_update);
#endif
BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
batadv_store_gw_mode);
BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
2 * BATADV_JITTER, INT_MAX, NULL);
BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
BATADV_TQ_MAX_VALUE, NULL);
BATADV_ATTR_SIF_UINT(gw_sel_class, gw_sel_class, S_IRUGO | S_IWUSR, 1,
BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect);
static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
batadv_store_gw_bwidth);
#ifdef CONFIG_BATMAN_ADV_MCAST
BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
#endif
#ifdef CONFIG_BATMAN_ADV_DEBUG
BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0,
BATADV_DBG_ALL, NULL);
#endif
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 17:12:38 +07:00
#ifdef CONFIG_BATMAN_ADV_NC
BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
batadv_nc_status_update);
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 17:12:38 +07:00
#endif
static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
batadv_show_isolation_mark, batadv_store_isolation_mark);
static struct batadv_attribute *batadv_mesh_attrs[] = {
&batadv_attr_aggregated_ogms,
&batadv_attr_bonding,
#ifdef CONFIG_BATMAN_ADV_BLA
&batadv_attr_bridge_loop_avoidance,
#endif
#ifdef CONFIG_BATMAN_ADV_DAT
&batadv_attr_distributed_arp_table,
#endif
#ifdef CONFIG_BATMAN_ADV_MCAST
&batadv_attr_multicast_mode,
#endif
&batadv_attr_fragmentation,
&batadv_attr_routing_algo,
&batadv_attr_gw_mode,
&batadv_attr_orig_interval,
&batadv_attr_hop_penalty,
&batadv_attr_gw_sel_class,
&batadv_attr_gw_bandwidth,
#ifdef CONFIG_BATMAN_ADV_DEBUG
&batadv_attr_log_level,
batman-adv: network coding - add the initial infrastructure code Network coding exploits the 802.11 shared medium to allow multiple packets to be sent in a single transmission. In brief, a relay can XOR two packets, and send the coded packet to two destinations. The receivers can decode one of the original packets by XOR'ing the coded packet with the other original packet. This will lead to increased throughput in topologies where two packets cross one relay. In a simple topology with three nodes, it takes four transmissions without network coding to get one packet from Node A to Node B and one from Node B to Node A: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <--- p2 ---- Node R Node B 4. Node A Node R ---- p1 ---> Node B With network coding, the relay only needs one transmission, which saves us one slot of valuable airtime: 1. Node A ---- p1 ---> Node R Node B 2. Node A Node R <--- p2 ---- Node B 3. Node A <- p1 x p2 - Node R - p1 x p2 -> Node B The same principle holds for a topology including five nodes. Here the packets from Node A and Node B are overheard by Node C and Node D, respectively. This allows Node R to send a network coded packet to save one transmission: Node A Node B | \ / | | p1 p2 | | \ / | p1 > Node R < p2 | | | / \ | | p1 x p2 p1 x p2 | v / \ v / \ Node C < > Node D More information is available on the open-mesh.org wiki[1]. This patch adds the initial code to support network coding in batman-adv. It sets up a worker thread to do house keeping and adds a sysfs file to enable/disable network coding. The feature is disabled by default, as it requires a wifi-driver with working promiscuous mode, and also because it adds a small delay at each hop. [1] http://www.open-mesh.org/projects/batman-adv/wiki/Catwoman Signed-off-by: Martin Hundebøll <martin@hundeboll.net> Signed-off-by: Marek Lindner <lindner_marek@yahoo.de> Signed-off-by: Antonio Quartulli <ordex@autistici.org>
2013-01-25 17:12:38 +07:00
#endif
#ifdef CONFIG_BATMAN_ADV_NC
&batadv_attr_network_coding,
#endif
&batadv_attr_isolation_mark,
NULL,
};
BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
/**
* batadv_vlan_attrs - array of vlan specific sysfs attributes
*/
static struct batadv_attribute *batadv_vlan_attrs[] = {
&batadv_attr_vlan_ap_isolation,
NULL,
};
int batadv_sysfs_add_meshif(struct net_device *dev)
{
struct kobject *batif_kobject = &dev->dev.kobj;
struct batadv_priv *bat_priv = netdev_priv(dev);
struct batadv_attribute **bat_attr;
int err;
bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
batif_kobject);
if (!bat_priv->mesh_obj) {
batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
BATADV_SYSFS_IF_MESH_SUBDIR);
goto out;
}
for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
err = sysfs_create_file(bat_priv->mesh_obj,
&((*bat_attr)->attr));
if (err) {
batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
((*bat_attr)->attr).name);
goto rem_attr;
}
}
return 0;
rem_attr:
for (bat_attr = batadv_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 batadv_sysfs_del_meshif(struct net_device *dev)
{
struct batadv_priv *bat_priv = netdev_priv(dev);
struct batadv_attribute **bat_attr;
for (bat_attr = batadv_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;
}
/**
* 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
*
* Returns 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)
{
char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
struct batadv_priv *bat_priv = netdev_priv(dev);
struct batadv_attribute **bat_attr;
int err;
if (vlan->vid & BATADV_VLAN_HAS_TAG) {
sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
vlan->vid & VLAN_VID_MASK);
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;
}
} else {
/* the untagged LAN uses the root folder to store its "VLAN
* specific attributes"
*/
vlan->kobj = bat_priv->mesh_obj;
kobject_get(bat_priv->mesh_obj);
}
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)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_hard_iface *hard_iface;
ssize_t length;
const char *ifname;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
return 0;
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
ifname = "none";
else
ifname = hard_iface->soft_iface->name;
length = sprintf(buff, "%s\n", ifname);
batadv_hardif_free_ref(hard_iface);
return length;
}
static ssize_t batadv_store_mesh_iface(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;
int status_tmp = -1;
int ret = count;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
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);
batadv_hardif_free_ref(hard_iface);
return -EINVAL;
}
if (strncmp(buff, "none", 4) == 0)
status_tmp = BATADV_IF_NOT_IN_USE;
else
status_tmp = BATADV_IF_I_WANT_YOU;
if (hard_iface->if_status == status_tmp)
goto out;
if ((hard_iface->soft_iface) &&
(strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
goto out;
rtnl_lock();
if (status_tmp == BATADV_IF_NOT_IN_USE) {
batadv_hardif_disable_interface(hard_iface,
BATADV_IF_CLEANUP_AUTO);
goto unlock;
}
/* if the interface already is in use */
if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
batadv_hardif_disable_interface(hard_iface,
BATADV_IF_CLEANUP_AUTO);
ret = batadv_hardif_enable_interface(hard_iface, buff);
unlock:
rtnl_unlock();
out:
batadv_hardif_free_ref(hard_iface);
return ret;
}
static ssize_t batadv_show_iface_status(struct kobject *kobj,
struct attribute *attr, char *buff)
{
struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
struct batadv_hard_iface *hard_iface;
ssize_t length;
hard_iface = batadv_hardif_get_by_netdev(net_dev);
if (!hard_iface)
return 0;
switch (hard_iface->if_status) {
case BATADV_IF_TO_BE_REMOVED:
length = sprintf(buff, "disabling\n");
break;
case BATADV_IF_INACTIVE:
length = sprintf(buff, "inactive\n");
break;
case BATADV_IF_ACTIVE:
length = sprintf(buff, "active\n");
break;
case BATADV_IF_TO_BE_ACTIVATED:
length = sprintf(buff, "enabling\n");
break;
case BATADV_IF_NOT_IN_USE:
default:
length = sprintf(buff, "not in use\n");
break;
}
batadv_hardif_free_ref(hard_iface);
return length;
}
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);
static struct batadv_attribute *batadv_batman_attrs[] = {
&batadv_attr_mesh_iface,
&batadv_attr_iface_status,
NULL,
};
int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
{
struct kobject *hardif_kobject = &dev->dev.kobj;
struct batadv_attribute **bat_attr;
int err;
*hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
hardif_kobject);
if (!*hardif_obj) {
batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
BATADV_SYSFS_IF_BAT_SUBDIR);
goto out;
}
for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
if (err) {
batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
((*bat_attr)->attr).name);
goto rem_attr;
}
}
return 0;
rem_attr:
for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
out:
return -ENOMEM;
}
void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
{
kobject_put(*hardif_obj);
*hardif_obj = NULL;
}
int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
enum batadv_uev_action action, const char *data)
{
int ret = -ENOMEM;
struct kobject *bat_kobj;
char *uevent_env[4] = { NULL, NULL, NULL, NULL };
bat_kobj = &bat_priv->soft_iface->dev.kobj;
uevent_env[0] = kasprintf(GFP_ATOMIC,
"%s%s", BATADV_UEV_TYPE_VAR,
batadv_uev_type_str[type]);
if (!uevent_env[0])
goto out;
uevent_env[1] = kasprintf(GFP_ATOMIC,
"%s%s", BATADV_UEV_ACTION_VAR,
batadv_uev_action_str[action]);
if (!uevent_env[1])
goto out;
/* If the event is DEL, ignore the data field */
if (action != BATADV_UEV_DEL) {
uevent_env[2] = kasprintf(GFP_ATOMIC,
"%s%s", BATADV_UEV_DATA_VAR, data);
if (!uevent_env[2])
goto out;
}
ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
out:
kfree(uevent_env[0]);
kfree(uevent_env[1]);
kfree(uevent_env[2]);
if (ret)
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
batadv_uev_type_str[type],
batadv_uev_action_str[action],
(action == BATADV_UEV_DEL ? "NULL" : data), ret);
return ret;
}