net/batman-adv/gateway_common.c - kernel/msm-5.4 - Gitiles

 /* Copyright (C) 2009-2016  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 "gateway_common.h"
 #include "main.h"

 #include <linux/atomic.h>
 #include <linux/byteorder/generic.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/math64.h>
 #include <linux/netdevice.h>
 #include <linux/stddef.h>
 #include <linux/string.h>

 #include "gateway_client.h"
 #include "log.h"
 #include "packet.h"
 #include "tvlv.h"

 /**
  * batadv_parse_throughput - parse supplied string buffer to extract throughput
  *  information
  * @net_dev: the soft interface net device
  * @buff: string buffer to parse
  * @description: text shown when throughput string cannot be parsed
  * @throughput: pointer holding the returned throughput information
  *
  * Return: false on parse error and true otherwise.
  */
 bool batadv_parse_throughput(struct net_device *net_dev, char *buff,
 			     const char *description, u32 *throughput)
 {
 	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
 	u64 lthroughput;
 	char *tmp_ptr;
 	int ret;

 	if (strlen(buff) > 4) {
 		tmp_ptr = buff + strlen(buff) - 4;

 		if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
 			bw_unit_type = BATADV_BW_UNIT_MBIT;

 		if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) ||
 		    (bw_unit_type == BATADV_BW_UNIT_MBIT))
 			*tmp_ptr = '\0';
 	}

 	ret = kstrtou64(buff, 10, &lthroughput);
 	if (ret) {
 		batadv_err(net_dev,
 			   "Invalid throughput speed for %s: %s\n",
 			   description, buff);
 		return false;
 	}

 	switch (bw_unit_type) {
 	case BATADV_BW_UNIT_MBIT:
 		/* prevent overflow */
 		if (U64_MAX / 10 < lthroughput) {
 			batadv_err(net_dev,
 				   "Throughput speed for %s too large: %s\n",
 				   description, buff);
 			return false;
 		}

 		lthroughput *= 10;
 		break;
 	case BATADV_BW_UNIT_KBIT:
 	default:
 		lthroughput = div_u64(lthroughput, 100);
 		break;
 	}

 	if (lthroughput > U32_MAX) {
 		batadv_err(net_dev,
 			   "Throughput speed for %s too large: %s\n",
 			   description, buff);
 		return false;
 	}

 	*throughput = lthroughput;

 	return true;
 }

 /**
  * batadv_parse_gw_bandwidth - parse supplied string buffer to extract download
  *  and upload bandwidth information
  * @net_dev: the soft interface net device
  * @buff: string buffer to parse
  * @down: pointer holding the returned download bandwidth information
  * @up: pointer holding the returned upload bandwidth information
  *
  * Return: false on parse error and true otherwise.
  */
 static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 				      u32 *down, u32 *up)
 {
 	char *slash_ptr;
 	bool ret;

 	slash_ptr = strchr(buff, '/');
 	if (slash_ptr)
 		*slash_ptr = 0;

 	ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
 				      down);
 	if (!ret)
 		return false;

 	/* we also got some upload info */
 	if (slash_ptr) {
 		ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
 					      "upload gateway speed", up);
 		if (!ret)
 			return false;
 	}

 	return true;
 }

 /**
  * batadv_gw_tvlv_container_update - update the gw tvlv container after gateway
  *  setting change
  * @bat_priv: the bat priv with all the soft interface information
  */
 void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
 {
 	struct batadv_tvlv_gateway_data gw;
 	u32 down, up;
 	char gw_mode;

 	gw_mode = atomic_read(&bat_priv->gw.mode);

 	switch (gw_mode) {
 	case BATADV_GW_MODE_OFF:
 	case BATADV_GW_MODE_CLIENT:
 		batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
 		break;
 	case BATADV_GW_MODE_SERVER:
 		down = atomic_read(&bat_priv->gw.bandwidth_down);
 		up = atomic_read(&bat_priv->gw.bandwidth_up);
 		gw.bandwidth_down = htonl(down);
 		gw.bandwidth_up = htonl(up);
 		batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
 					       &gw, sizeof(gw));
 		break;
 	}
 }

 ssize_t batadv_gw_bandwidth_set(struct net_device *net_dev, char *buff,
 				size_t count)
 {
 	struct batadv_priv *bat_priv = netdev_priv(net_dev);
 	u32 down_curr;
 	u32 up_curr;
 	u32 down_new = 0;
 	u32 up_new = 0;
 	bool ret;

 	down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
 	up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);

 	ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
 	if (!ret)
 		return -EINVAL;

 	if (!down_new)
 		down_new = 1;

 	if (!up_new)
 		up_new = down_new / 5;

 	if (!up_new)
 		up_new = 1;

 	if ((down_curr == down_new) && (up_curr == up_new))
 		return count;

 	batadv_gw_reselect(bat_priv);
 	batadv_info(net_dev,
 		    "Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
 		    down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
 		    down_new / 10, down_new % 10, up_new / 10, up_new % 10);

 	atomic_set(&bat_priv->gw.bandwidth_down, down_new);
 	atomic_set(&bat_priv->gw.bandwidth_up, up_new);
 	batadv_gw_tvlv_container_update(bat_priv);

 	return count;
 }

 /**
  * batadv_gw_tvlv_ogm_handler_v1 - process incoming gateway tvlv container
  * @bat_priv: the bat priv with all the soft interface information
  * @orig: the orig_node of the ogm
  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
  * @tvlv_value: tvlv buffer containing the gateway data
  * @tvlv_value_len: tvlv buffer length
  */
 static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 					  struct batadv_orig_node *orig,
 					  u8 flags,
 					  void *tvlv_value, u16 tvlv_value_len)
 {
 	struct batadv_tvlv_gateway_data gateway, *gateway_ptr;

 	/* only fetch the tvlv value if the handler wasn't called via the
 	 * CIFNOTFND flag and if there is data to fetch
 	 */
 	if ((flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) ||
 	    (tvlv_value_len < sizeof(gateway))) {
 		gateway.bandwidth_down = 0;
 		gateway.bandwidth_up = 0;
 	} else {
 		gateway_ptr = tvlv_value;
 		gateway.bandwidth_down = gateway_ptr->bandwidth_down;
 		gateway.bandwidth_up = gateway_ptr->bandwidth_up;
 		if ((gateway.bandwidth_down == 0) ||
 		    (gateway.bandwidth_up == 0)) {
 			gateway.bandwidth_down = 0;
 			gateway.bandwidth_up = 0;
 		}
 	}

 	batadv_gw_node_update(bat_priv, orig, &gateway);

 	/* restart gateway selection if fast or late switching was enabled */
 	if ((gateway.bandwidth_down != 0) &&
 	    (atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT) &&
 	    (atomic_read(&bat_priv->gw.sel_class) > 2))
 		batadv_gw_check_election(bat_priv, orig);
 }

 /**
  * batadv_gw_init - initialise the gateway handling internals
  * @bat_priv: the bat priv with all the soft interface information
  */
 void batadv_gw_init(struct batadv_priv *bat_priv)
 {
 	batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
 				     NULL, BATADV_TVLV_GW, 1,
 				     BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
 }

 /**
  * batadv_gw_free - free the gateway handling internals
  * @bat_priv: the bat priv with all the soft interface information
  */
 void batadv_gw_free(struct batadv_priv *bat_priv)
 {
 	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
 	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
 }
	/* Copyright (C) 2009-2016 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 "gateway_common.h"
	#include "main.h"

	#include <linux/atomic.h>
	#include <linux/byteorder/generic.h>
	#include <linux/errno.h>
	#include <linux/kernel.h>
	#include <linux/math64.h>
	#include <linux/netdevice.h>
	#include <linux/stddef.h>
	#include <linux/string.h>

	#include "gateway_client.h"
	#include "log.h"
	#include "packet.h"
	#include "tvlv.h"

	/**
	* batadv_parse_throughput - parse supplied string buffer to extract throughput
	* information
	* @net_dev: the soft interface net device
	* @buff: string buffer to parse
	* @description: text shown when throughput string cannot be parsed
	* @throughput: pointer holding the returned throughput information
	*
	* Return: false on parse error and true otherwise.
	*/
	bool batadv_parse_throughput(struct net_device net_dev, char buff,
	const char description, u32 throughput)
	{
	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
	u64 lthroughput;
	char *tmp_ptr;
	int ret;

	if (strlen(buff) > 4) {
	tmp_ptr = buff + strlen(buff) - 4;

	if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
	bw_unit_type = BATADV_BW_UNIT_MBIT;

	if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) \|\|
	(bw_unit_type == BATADV_BW_UNIT_MBIT))
	*tmp_ptr = '\0';
	}

	ret = kstrtou64(buff, 10, &lthroughput);
	if (ret) {
	batadv_err(net_dev,
	"Invalid throughput speed for %s: %s\n",
	description, buff);
	return false;
	}

	switch (bw_unit_type) {
	case BATADV_BW_UNIT_MBIT:
	/* prevent overflow */
	if (U64_MAX / 10 < lthroughput) {
	batadv_err(net_dev,
	"Throughput speed for %s too large: %s\n",
	description, buff);
	return false;
	}

	lthroughput *= 10;
	break;
	case BATADV_BW_UNIT_KBIT:
	default:
	lthroughput = div_u64(lthroughput, 100);
	break;
	}

	if (lthroughput > U32_MAX) {
	batadv_err(net_dev,
	"Throughput speed for %s too large: %s\n",
	description, buff);
	return false;
	}

	*throughput = lthroughput;

	return true;
	}

	/**
	* batadv_parse_gw_bandwidth - parse supplied string buffer to extract download
	* and upload bandwidth information
	* @net_dev: the soft interface net device
	* @buff: string buffer to parse
	* @down: pointer holding the returned download bandwidth information
	* @up: pointer holding the returned upload bandwidth information
	*
	* Return: false on parse error and true otherwise.
	*/
	static bool batadv_parse_gw_bandwidth(struct net_device net_dev, char buff,
	u32 down, u32 up)
	{
	char *slash_ptr;
	bool ret;

	slash_ptr = strchr(buff, '/');
	if (slash_ptr)
	*slash_ptr = 0;

	ret = batadv_parse_throughput(net_dev, buff, "download gateway speed",
	down);
	if (!ret)
	return false;

	/* we also got some upload info */
	if (slash_ptr) {
	ret = batadv_parse_throughput(net_dev, slash_ptr + 1,
	"upload gateway speed", up);
	if (!ret)
	return false;
	}

	return true;
	}

	/**
	* batadv_gw_tvlv_container_update - update the gw tvlv container after gateway
	* setting change
	* @bat_priv: the bat priv with all the soft interface information
	*/
	void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
	{
	struct batadv_tvlv_gateway_data gw;
	u32 down, up;
	char gw_mode;

	gw_mode = atomic_read(&bat_priv->gw.mode);

	switch (gw_mode) {
	case BATADV_GW_MODE_OFF:
	case BATADV_GW_MODE_CLIENT:
	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	break;
	case BATADV_GW_MODE_SERVER:
	down = atomic_read(&bat_priv->gw.bandwidth_down);
	up = atomic_read(&bat_priv->gw.bandwidth_up);
	gw.bandwidth_down = htonl(down);
	gw.bandwidth_up = htonl(up);
	batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
	&gw, sizeof(gw));
	break;
	}
	}

	ssize_t batadv_gw_bandwidth_set(struct net_device net_dev, char buff,
	size_t count)
	{
	struct batadv_priv *bat_priv = netdev_priv(net_dev);
	u32 down_curr;
	u32 up_curr;
	u32 down_new = 0;
	u32 up_new = 0;
	bool ret;

	down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
	up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);

	ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
	if (!ret)
	return -EINVAL;

	if (!down_new)
	down_new = 1;

	if (!up_new)
	up_new = down_new / 5;

	if (!up_new)
	up_new = 1;

	if ((down_curr == down_new) && (up_curr == up_new))
	return count;

	batadv_gw_reselect(bat_priv);
	batadv_info(net_dev,
	"Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
	down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
	down_new / 10, down_new % 10, up_new / 10, up_new % 10);

	atomic_set(&bat_priv->gw.bandwidth_down, down_new);
	atomic_set(&bat_priv->gw.bandwidth_up, up_new);
	batadv_gw_tvlv_container_update(bat_priv);

	return count;
	}

	/**
	* batadv_gw_tvlv_ogm_handler_v1 - process incoming gateway tvlv container
	* @bat_priv: the bat priv with all the soft interface information
	* @orig: the orig_node of the ogm
	* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
	* @tvlv_value: tvlv buffer containing the gateway data
	* @tvlv_value_len: tvlv buffer length
	*/
	static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
	struct batadv_orig_node *orig,
	u8 flags,
	void *tvlv_value, u16 tvlv_value_len)
	{
	struct batadv_tvlv_gateway_data gateway, *gateway_ptr;

	/* only fetch the tvlv value if the handler wasn't called via the
	* CIFNOTFND flag and if there is data to fetch
	*/
	if ((flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) \|\|
	(tvlv_value_len < sizeof(gateway))) {
	gateway.bandwidth_down = 0;
	gateway.bandwidth_up = 0;
	} else {
	gateway_ptr = tvlv_value;
	gateway.bandwidth_down = gateway_ptr->bandwidth_down;
	gateway.bandwidth_up = gateway_ptr->bandwidth_up;
	if ((gateway.bandwidth_down == 0) \|\|
	(gateway.bandwidth_up == 0)) {
	gateway.bandwidth_down = 0;
	gateway.bandwidth_up = 0;
	}
	}

	batadv_gw_node_update(bat_priv, orig, &gateway);

	/* restart gateway selection if fast or late switching was enabled */
	if ((gateway.bandwidth_down != 0) &&
	(atomic_read(&bat_priv->gw.mode) == BATADV_GW_MODE_CLIENT) &&
	(atomic_read(&bat_priv->gw.sel_class) > 2))
	batadv_gw_check_election(bat_priv, orig);
	}

	/**
	* batadv_gw_init - initialise the gateway handling internals
	* @bat_priv: the bat priv with all the soft interface information
	*/
	void batadv_gw_init(struct batadv_priv *bat_priv)
	{
	batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
	NULL, BATADV_TVLV_GW, 1,
	BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
	}

	/**
	* batadv_gw_free - free the gateway handling internals
	* @bat_priv: the bat priv with all the soft interface information
	*/
	void batadv_gw_free(struct batadv_priv *bat_priv)
	{
	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
	}