net/batman-adv/gateway_common.c - kernel/msm-4.9 - Gitiles

 /* Copyright (C) 2009-2015 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 "gateway_common.h"
 #include "main.h"

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

 #include "gateway_client.h"
 #include "packet.h"

 /**
  * 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
  *
  * Returns false on parse error and true otherwise.
  */
 static bool batadv_parse_gw_bandwidth(struct net_device *net_dev, char *buff,
 				      uint32_t *down, uint32_t *up)
 {
 	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
 	char *slash_ptr, *tmp_ptr;
 	long ldown, lup;
 	int ret;

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

 	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 = kstrtol(buff, 10, &ldown);
 	if (ret) {
 		batadv_err(net_dev,
 			   "Download speed of gateway mode invalid: %s\n",
 			   buff);
 		return false;
 	}

 	switch (bw_unit_type) {
 	case BATADV_BW_UNIT_MBIT:
 		*down = ldown * 10;
 		break;
 	case BATADV_BW_UNIT_KBIT:
 	default:
 		*down = ldown / 100;
 		break;
 	}

 	/* we also got some upload info */
 	if (slash_ptr) {
 		bw_unit_type = BATADV_BW_UNIT_KBIT;

 		if (strlen(slash_ptr + 1) > 4) {
 			tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);

 			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 = kstrtol(slash_ptr + 1, 10, &lup);
 		if (ret) {
 			batadv_err(net_dev,
 				   "Upload speed of gateway mode invalid: %s\n",
 				   slash_ptr + 1);
 			return false;
 		}

 		switch (bw_unit_type) {
 		case BATADV_BW_UNIT_MBIT:
 			*up = lup * 10;
 			break;
 		case BATADV_BW_UNIT_KBIT:
 		default:
 			*up = lup / 100;
 			break;
 		}
 	}

 	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;
 	uint32_t 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);
 	uint32_t down_curr, up_curr, down_new = 0, 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)
 		goto end;

 	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);

 end:
 	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,
 					  uint8_t flags,
 					  void *tvlv_value,
 					  uint16_t 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) 2009-2015 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 "gateway_common.h"
	#include "main.h"

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

	#include "gateway_client.h"
	#include "packet.h"

	/**
	* 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
	*
	* Returns false on parse error and true otherwise.
	*/
	static bool batadv_parse_gw_bandwidth(struct net_device net_dev, char buff,
	uint32_t down, uint32_t up)
	{
	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
	char slash_ptr, tmp_ptr;
	long ldown, lup;
	int ret;

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

	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 = kstrtol(buff, 10, &ldown);
	if (ret) {
	batadv_err(net_dev,
	"Download speed of gateway mode invalid: %s\n",
	buff);
	return false;
	}

	switch (bw_unit_type) {
	case BATADV_BW_UNIT_MBIT:
	down = ldown 10;
	break;
	case BATADV_BW_UNIT_KBIT:
	default:
	*down = ldown / 100;
	break;
	}

	/* we also got some upload info */
	if (slash_ptr) {
	bw_unit_type = BATADV_BW_UNIT_KBIT;

	if (strlen(slash_ptr + 1) > 4) {
	tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);

	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 = kstrtol(slash_ptr + 1, 10, &lup);
	if (ret) {
	batadv_err(net_dev,
	"Upload speed of gateway mode invalid: %s\n",
	slash_ptr + 1);
	return false;
	}

	switch (bw_unit_type) {
	case BATADV_BW_UNIT_MBIT:
	up = lup 10;
	break;
	case BATADV_BW_UNIT_KBIT:
	default:
	*up = lup / 100;
	break;
	}
	}

	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;
	uint32_t 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);
	uint32_t down_curr, up_curr, down_new = 0, 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)
	goto end;

	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);

	end:
	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,
	uint8_t flags,
	void *tvlv_value,
	uint16_t 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);
	}