[linux-2.6-block.git] / net / batman-adv / gateway_common.c

/* 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/errno.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,
				      u32 *down, u32 *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;
	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);
}
Commit	Line	Data
9f6446c7	1	/* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors:
c6c8fea2 SE	2	*
	3	* Marek Lindner
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of version 2 of the GNU General Public
	7	* License as published by the Free Software Foundation.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	12	* General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
ebf38fb7	15	* along with this program; if not, see <http://www.gnu.org/licenses/>.
c6c8fea2 SE	16	*/
c6c8fea2 SE	17
c6c8fea2	18	#include "gateway_common.h"
1e2c2a4f SE	19	#include "main.h"
	20
	21	#include <linux/atomic.h>
77927b7d	22	#include <linux/errno.h>
1e2c2a4f SE	23	#include <linux/byteorder/generic.h>
	24	#include <linux/kernel.h>
	25	#include <linux/netdevice.h>
	26	#include <linux/stddef.h>
	27	#include <linux/string.h>
	28
c6c8fea2	29	#include "gateway_client.h"
1e2c2a4f	30	#include "packet.h"
c6c8fea2	31
414254e3 ML	32	/**
	33	* batadv_parse_gw_bandwidth - parse supplied string buffer to extract download
	34	* and upload bandwidth information
	35	* @net_dev: the soft interface net device
	36	* @buff: string buffer to parse
	37	* @down: pointer holding the returned download bandwidth information
	38	* @up: pointer holding the returned upload bandwidth information
	39	*
	40	* Returns false on parse error and true otherwise.
	41	*/
8e714a5d	42	static bool batadv_parse_gw_bandwidth(struct net_device net_dev, char buff,
6b5e971a	43	u32 down, u32 up)
c6c8fea2	44	{
414254e3	45	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
c6c8fea2	46	char slash_ptr, tmp_ptr;
37a4065e	47	long ldown, lup;
414254e3	48	int ret;
c6c8fea2 SE	49
	50	slash_ptr = strchr(buff, '/');
	51	if (slash_ptr)
	52	*slash_ptr = 0;
	53
	54	if (strlen(buff) > 4) {
	55	tmp_ptr = buff + strlen(buff) - 4;
	56
b7a8d756	57	if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
414254e3	58	bw_unit_type = BATADV_BW_UNIT_MBIT;
c6c8fea2	59
b7a8d756	60	if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) \|\|
414254e3	61	(bw_unit_type == BATADV_BW_UNIT_MBIT))
c6c8fea2 SE	62	*tmp_ptr = '\0';
	63	}
	64
25a92b13	65	ret = kstrtol(buff, 10, &ldown);
c6c8fea2	66	if (ret) {
3e34819e SE	67	batadv_err(net_dev,
	68	"Download speed of gateway mode invalid: %s\n",
	69	buff);
c6c8fea2 SE	70	return false;
	71	}
	72
414254e3 ML	73	switch (bw_unit_type) {
	74	case BATADV_BW_UNIT_MBIT:
	75	down = ldown 10;
	76	break;
	77	case BATADV_BW_UNIT_KBIT:
	78	default:
	79	*down = ldown / 100;
	80	break;
	81	}
c6c8fea2 SE	82
	83	/* we also got some upload info */
	84	if (slash_ptr) {
414254e3	85	bw_unit_type = BATADV_BW_UNIT_KBIT;
c6c8fea2 SE	86
	87	if (strlen(slash_ptr + 1) > 4) {
	88	tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
	89
b7a8d756	90	if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
414254e3	91	bw_unit_type = BATADV_BW_UNIT_MBIT;
c6c8fea2	92
b7a8d756	93	if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) \|\|
414254e3	94	(bw_unit_type == BATADV_BW_UNIT_MBIT))
c6c8fea2 SE	95	*tmp_ptr = '\0';
	96	}
	97
25a92b13	98	ret = kstrtol(slash_ptr + 1, 10, &lup);
c6c8fea2	99	if (ret) {
3e34819e SE	100	batadv_err(net_dev,
	101	"Upload speed of gateway mode invalid: %s\n",
	102	slash_ptr + 1);
c6c8fea2 SE	103	return false;
	104	}
	105
414254e3 ML	106	switch (bw_unit_type) {
	107	case BATADV_BW_UNIT_MBIT:
	108	up = lup 10;
	109	break;
	110	case BATADV_BW_UNIT_KBIT:
	111	default:
	112	*up = lup / 100;
	113	break;
	114	}
c6c8fea2 SE	115	}
	116
	117	return true;
	118	}
	119
414254e3 ML	120	/**
	121	* batadv_gw_tvlv_container_update - update the gw tvlv container after gateway
	122	* setting change
	123	* @bat_priv: the bat priv with all the soft interface information
	124	*/
	125	void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
	126	{
	127	struct batadv_tvlv_gateway_data gw;
6b5e971a	128	u32 down, up;
414254e3 ML	129	char gw_mode;
	130
	131	gw_mode = atomic_read(&bat_priv->gw_mode);
	132
	133	switch (gw_mode) {
	134	case BATADV_GW_MODE_OFF:
	135	case BATADV_GW_MODE_CLIENT:
	136	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	137	break;
	138	case BATADV_GW_MODE_SERVER:
	139	down = atomic_read(&bat_priv->gw.bandwidth_down);
	140	up = atomic_read(&bat_priv->gw.bandwidth_up);
	141	gw.bandwidth_down = htonl(down);
	142	gw.bandwidth_up = htonl(up);
	143	batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
	144	&gw, sizeof(gw));
	145	break;
	146	}
	147	}
	148
84d5e5e0 SE	149	ssize_t batadv_gw_bandwidth_set(struct net_device net_dev, char buff,
84d5e5e0 SE	150	size_t count)
c6c8fea2	151	{
56303d34	152	struct batadv_priv *bat_priv = netdev_priv(net_dev);
4f248cff SE	153	u32 down_curr;
	154	u32 up_curr;
	155	u32 down_new = 0;
	156	u32 up_new = 0;
c6c8fea2 SE	157	bool ret;
c6c8fea2 SE	158
414254e3 ML	159	down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
	160	up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
	161
	162	ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
c6c8fea2	163	if (!ret)
77927b7d	164	return -EINVAL;
c6c8fea2	165
414254e3 ML	166	if (!down_new)
414254e3 ML	167	down_new = 1;
c6c8fea2	168
414254e3 ML	169	if (!up_new)
414254e3 ML	170	up_new = down_new / 5;
c6c8fea2	171
414254e3 ML	172	if (!up_new)
414254e3 ML	173	up_new = 1;
c6c8fea2	174
414254e3	175	if ((down_curr == down_new) && (up_curr == up_new))
dafe94b2 ML	176	return count;
dafe94b2 ML	177
4e820e72	178	batadv_gw_reselect(bat_priv);
3e34819e	179	batadv_info(net_dev,
414254e3 ML	180	"Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
	181	down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
	182	down_new / 10, down_new % 10, up_new / 10, up_new % 10);
c6c8fea2	183
414254e3 ML	184	atomic_set(&bat_priv->gw.bandwidth_down, down_new);
	185	atomic_set(&bat_priv->gw.bandwidth_up, up_new);
	186	batadv_gw_tvlv_container_update(bat_priv);
c6c8fea2	187
c6c8fea2 SE	188	return count;
c6c8fea2 SE	189	}
414254e3 ML	190
	191	/**
	192	* batadv_gw_tvlv_ogm_handler_v1 - process incoming gateway tvlv container
	193	* @bat_priv: the bat priv with all the soft interface information
	194	* @orig: the orig_node of the ogm
	195	* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
	196	* @tvlv_value: tvlv buffer containing the gateway data
	197	* @tvlv_value_len: tvlv buffer length
	198	*/
	199	static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
	200	struct batadv_orig_node *orig,
6b5e971a SE	201	u8 flags,
6b5e971a SE	202	void *tvlv_value, u16 tvlv_value_len)
414254e3 ML	203	{
	204	struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
	205
	206	/* only fetch the tvlv value if the handler wasn't called via the
	207	* CIFNOTFND flag and if there is data to fetch
	208	*/
	209	if ((flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) \|\|
	210	(tvlv_value_len < sizeof(gateway))) {
	211	gateway.bandwidth_down = 0;
	212	gateway.bandwidth_up = 0;
	213	} else {
	214	gateway_ptr = tvlv_value;
	215	gateway.bandwidth_down = gateway_ptr->bandwidth_down;
	216	gateway.bandwidth_up = gateway_ptr->bandwidth_up;
	217	if ((gateway.bandwidth_down == 0) \|\|
	218	(gateway.bandwidth_up == 0)) {
	219	gateway.bandwidth_down = 0;
	220	gateway.bandwidth_up = 0;
	221	}
	222	}
	223
	224	batadv_gw_node_update(bat_priv, orig, &gateway);
	225
	226	/* restart gateway selection if fast or late switching was enabled */
	227	if ((gateway.bandwidth_down != 0) &&
	228	(atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
	229	(atomic_read(&bat_priv->gw_sel_class) > 2))
	230	batadv_gw_check_election(bat_priv, orig);
	231	}
	232
	233	/**
	234	* batadv_gw_init - initialise the gateway handling internals
	235	* @bat_priv: the bat priv with all the soft interface information
	236	*/
	237	void batadv_gw_init(struct batadv_priv *bat_priv)
	238	{
	239	batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
	240	NULL, BATADV_TVLV_GW, 1,
	241	BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
	242	}
	243
	244	/**
	245	* batadv_gw_free - free the gateway handling internals
	246	* @bat_priv: the bat priv with all the soft interface information
	247	*/
	248	void batadv_gw_free(struct batadv_priv *bat_priv)
	249	{
	250	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	251	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
	252	}