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

/* Copyright (C) 2009-2014 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 "main.h"
#include "gateway_common.h"
#include "gateway_client.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);
}
Commit	Line	Data
e19f9759	1	/* Copyright (C) 2009-2014 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	*/
	17
	18	#include "main.h"
	19	#include "gateway_common.h"
	20	#include "gateway_client.h"
	21
414254e3 ML	22	/**
	23	* batadv_parse_gw_bandwidth - parse supplied string buffer to extract download
	24	* and upload bandwidth information
	25	* @net_dev: the soft interface net device
	26	* @buff: string buffer to parse
	27	* @down: pointer holding the returned download bandwidth information
	28	* @up: pointer holding the returned upload bandwidth information
	29	*
	30	* Returns false on parse error and true otherwise.
	31	*/
8e714a5d	32	static bool batadv_parse_gw_bandwidth(struct net_device net_dev, char buff,
414254e3	33	uint32_t down, uint32_t up)
c6c8fea2	34	{
414254e3	35	enum batadv_bandwidth_units bw_unit_type = BATADV_BW_UNIT_KBIT;
c6c8fea2	36	char slash_ptr, tmp_ptr;
37a4065e	37	long ldown, lup;
414254e3	38	int ret;
c6c8fea2 SE	39
	40	slash_ptr = strchr(buff, '/');
	41	if (slash_ptr)
	42	*slash_ptr = 0;
	43
	44	if (strlen(buff) > 4) {
	45	tmp_ptr = buff + strlen(buff) - 4;
	46
b7a8d756	47	if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
414254e3	48	bw_unit_type = BATADV_BW_UNIT_MBIT;
c6c8fea2	49
b7a8d756	50	if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) \|\|
414254e3	51	(bw_unit_type == BATADV_BW_UNIT_MBIT))
c6c8fea2 SE	52	*tmp_ptr = '\0';
	53	}
	54
25a92b13	55	ret = kstrtol(buff, 10, &ldown);
c6c8fea2	56	if (ret) {
3e34819e SE	57	batadv_err(net_dev,
	58	"Download speed of gateway mode invalid: %s\n",
	59	buff);
c6c8fea2 SE	60	return false;
	61	}
	62
414254e3 ML	63	switch (bw_unit_type) {
	64	case BATADV_BW_UNIT_MBIT:
	65	down = ldown 10;
	66	break;
	67	case BATADV_BW_UNIT_KBIT:
	68	default:
	69	*down = ldown / 100;
	70	break;
	71	}
c6c8fea2 SE	72
	73	/* we also got some upload info */
	74	if (slash_ptr) {
414254e3	75	bw_unit_type = BATADV_BW_UNIT_KBIT;
c6c8fea2 SE	76
	77	if (strlen(slash_ptr + 1) > 4) {
	78	tmp_ptr = slash_ptr + 1 - 4 + strlen(slash_ptr + 1);
	79
b7a8d756	80	if (strncasecmp(tmp_ptr, "mbit", 4) == 0)
414254e3	81	bw_unit_type = BATADV_BW_UNIT_MBIT;
c6c8fea2	82
b7a8d756	83	if ((strncasecmp(tmp_ptr, "kbit", 4) == 0) \|\|
414254e3	84	(bw_unit_type == BATADV_BW_UNIT_MBIT))
c6c8fea2 SE	85	*tmp_ptr = '\0';
	86	}
	87
25a92b13	88	ret = kstrtol(slash_ptr + 1, 10, &lup);
c6c8fea2	89	if (ret) {
3e34819e SE	90	batadv_err(net_dev,
	91	"Upload speed of gateway mode invalid: %s\n",
	92	slash_ptr + 1);
c6c8fea2 SE	93	return false;
	94	}
	95
414254e3 ML	96	switch (bw_unit_type) {
	97	case BATADV_BW_UNIT_MBIT:
	98	up = lup 10;
	99	break;
	100	case BATADV_BW_UNIT_KBIT:
	101	default:
	102	*up = lup / 100;
	103	break;
	104	}
c6c8fea2 SE	105	}
	106
	107	return true;
	108	}
	109
414254e3 ML	110	/**
	111	* batadv_gw_tvlv_container_update - update the gw tvlv container after gateway
	112	* setting change
	113	* @bat_priv: the bat priv with all the soft interface information
	114	*/
	115	void batadv_gw_tvlv_container_update(struct batadv_priv *bat_priv)
	116	{
	117	struct batadv_tvlv_gateway_data gw;
	118	uint32_t down, up;
	119	char gw_mode;
	120
	121	gw_mode = atomic_read(&bat_priv->gw_mode);
	122
	123	switch (gw_mode) {
	124	case BATADV_GW_MODE_OFF:
	125	case BATADV_GW_MODE_CLIENT:
	126	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	127	break;
	128	case BATADV_GW_MODE_SERVER:
	129	down = atomic_read(&bat_priv->gw.bandwidth_down);
	130	up = atomic_read(&bat_priv->gw.bandwidth_up);
	131	gw.bandwidth_down = htonl(down);
	132	gw.bandwidth_up = htonl(up);
	133	batadv_tvlv_container_register(bat_priv, BATADV_TVLV_GW, 1,
	134	&gw, sizeof(gw));
	135	break;
	136	}
	137	}
	138
84d5e5e0 SE	139	ssize_t batadv_gw_bandwidth_set(struct net_device net_dev, char buff,
84d5e5e0 SE	140	size_t count)
c6c8fea2	141	{
56303d34	142	struct batadv_priv *bat_priv = netdev_priv(net_dev);
414254e3	143	uint32_t down_curr, up_curr, down_new = 0, up_new = 0;
c6c8fea2 SE	144	bool ret;
c6c8fea2 SE	145
414254e3 ML	146	down_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_down);
	147	up_curr = (unsigned int)atomic_read(&bat_priv->gw.bandwidth_up);
	148
	149	ret = batadv_parse_gw_bandwidth(net_dev, buff, &down_new, &up_new);
c6c8fea2 SE	150	if (!ret)
	151	goto end;
	152
414254e3 ML	153	if (!down_new)
414254e3 ML	154	down_new = 1;
c6c8fea2	155
414254e3 ML	156	if (!up_new)
414254e3 ML	157	up_new = down_new / 5;
c6c8fea2	158
414254e3 ML	159	if (!up_new)
414254e3 ML	160	up_new = 1;
c6c8fea2	161
414254e3	162	if ((down_curr == down_new) && (up_curr == up_new))
dafe94b2 ML	163	return count;
dafe94b2 ML	164
4e820e72	165	batadv_gw_reselect(bat_priv);
3e34819e	166	batadv_info(net_dev,
414254e3 ML	167	"Changing gateway bandwidth from: '%u.%u/%u.%u MBit' to: '%u.%u/%u.%u MBit'\n",
	168	down_curr / 10, down_curr % 10, up_curr / 10, up_curr % 10,
	169	down_new / 10, down_new % 10, up_new / 10, up_new % 10);
c6c8fea2	170
414254e3 ML	171	atomic_set(&bat_priv->gw.bandwidth_down, down_new);
	172	atomic_set(&bat_priv->gw.bandwidth_up, up_new);
	173	batadv_gw_tvlv_container_update(bat_priv);
c6c8fea2 SE	174
	175	end:
	176	return count;
	177	}
414254e3 ML	178
	179	/**
	180	* batadv_gw_tvlv_ogm_handler_v1 - process incoming gateway tvlv container
	181	* @bat_priv: the bat priv with all the soft interface information
	182	* @orig: the orig_node of the ogm
	183	* @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
	184	* @tvlv_value: tvlv buffer containing the gateway data
	185	* @tvlv_value_len: tvlv buffer length
	186	*/
	187	static void batadv_gw_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
	188	struct batadv_orig_node *orig,
	189	uint8_t flags,
	190	void *tvlv_value,
	191	uint16_t tvlv_value_len)
	192	{
	193	struct batadv_tvlv_gateway_data gateway, *gateway_ptr;
	194
	195	/* only fetch the tvlv value if the handler wasn't called via the
	196	* CIFNOTFND flag and if there is data to fetch
	197	*/
	198	if ((flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) \|\|
	199	(tvlv_value_len < sizeof(gateway))) {
	200	gateway.bandwidth_down = 0;
	201	gateway.bandwidth_up = 0;
	202	} else {
	203	gateway_ptr = tvlv_value;
	204	gateway.bandwidth_down = gateway_ptr->bandwidth_down;
	205	gateway.bandwidth_up = gateway_ptr->bandwidth_up;
	206	if ((gateway.bandwidth_down == 0) \|\|
	207	(gateway.bandwidth_up == 0)) {
	208	gateway.bandwidth_down = 0;
	209	gateway.bandwidth_up = 0;
	210	}
	211	}
	212
	213	batadv_gw_node_update(bat_priv, orig, &gateway);
	214
	215	/* restart gateway selection if fast or late switching was enabled */
	216	if ((gateway.bandwidth_down != 0) &&
	217	(atomic_read(&bat_priv->gw_mode) == BATADV_GW_MODE_CLIENT) &&
	218	(atomic_read(&bat_priv->gw_sel_class) > 2))
	219	batadv_gw_check_election(bat_priv, orig);
	220	}
	221
	222	/**
	223	* batadv_gw_init - initialise the gateway handling internals
	224	* @bat_priv: the bat priv with all the soft interface information
	225	*/
	226	void batadv_gw_init(struct batadv_priv *bat_priv)
	227	{
	228	batadv_tvlv_handler_register(bat_priv, batadv_gw_tvlv_ogm_handler_v1,
	229	NULL, BATADV_TVLV_GW, 1,
	230	BATADV_TVLV_HANDLER_OGM_CIFNOTFND);
	231	}
	232
	233	/**
	234	* batadv_gw_free - free the gateway handling internals
	235	* @bat_priv: the bat priv with all the soft interface information
	236	*/
	237	void batadv_gw_free(struct batadv_priv *bat_priv)
	238	{
	239	batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_GW, 1);
	240	batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_GW, 1);
	241	}