[net-next-2.6.git] / net / tipc / discover.c

/*
 * net/tipc/discover.c
 *
 * Copyright (c) 2003-2006, Ericsson AB
 * Copyright (c) 2005-2006, Wind River Systems
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the names of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * Alternatively, this software may be distributed under the terms of the
 * GNU General Public License ("GPL") version 2 as published by the Free
 * Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "core.h"
#include "dbg.h"
#include "link.h"
#include "zone.h"
#include "discover.h"
#include "port.h"
#include "name_table.h"

#define TIPC_LINK_REQ_INIT	125	/* min delay during bearer start up */
#define TIPC_LINK_REQ_FAST	2000	/* normal delay if bearer has no links */
#define TIPC_LINK_REQ_SLOW	600000	/* normal delay if bearer has links */

/*
 * TODO: Most of the inter-cluster setup stuff should be
 * rewritten, and be made conformant with specification.
 */


/**
 * struct link_req - information about an ongoing link setup request
 * @bearer: bearer issuing requests
 * @dest: destination address for request messages
 * @buf: request message to be (repeatedly) sent
 * @timer: timer governing period between requests
 * @timer_intv: current interval between requests (in ms)
 */
struct link_req {
	struct bearer *bearer;
	struct tipc_media_addr dest;
	struct sk_buff *buf;
	struct timer_list timer;
	unsigned int timer_intv;
};

/**
 * tipc_disc_init_msg - initialize a link setup message
 * @type: message type (request or response)
 * @req_links: number of links associated with message
 * @dest_domain: network domain of node(s) which should respond to message
 * @b_ptr: ptr to bearer issuing message
 */

static struct sk_buff *tipc_disc_init_msg(u32 type,
					  u32 req_links,
					  u32 dest_domain,
					  struct bearer *b_ptr)
{
	struct sk_buff *buf = tipc_buf_acquire(DSC_H_SIZE);
	struct tipc_msg *msg;

	if (buf) {
		msg = buf_msg(buf);
		tipc_msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain);
		msg_set_non_seq(msg, 1);
		msg_set_req_links(msg, req_links);
		msg_set_dest_domain(msg, dest_domain);
		msg_set_bc_netid(msg, tipc_net_id);
		msg_set_media_addr(msg, &b_ptr->publ.addr);
	}
	return buf;
}

/**
 * disc_dupl_alert - issue node address duplication alert
 * @b_ptr: pointer to bearer detecting duplication
 * @node_addr: duplicated node address
 * @media_addr: media address advertised by duplicated node
 */

static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr,
			    struct tipc_media_addr *media_addr)
{
	char node_addr_str[16];
	char media_addr_str[64];
	struct print_buf pb;

	tipc_addr_string_fill(node_addr_str, node_addr);
	tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str));
	tipc_media_addr_printf(&pb, media_addr);
	tipc_printbuf_validate(&pb);
	warn("Duplicate %s using %s seen on <%s>\n",
	     node_addr_str, media_addr_str, b_ptr->publ.name);
}

/**
 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
 * @buf: buffer containing message
 * @b_ptr: bearer that message arrived on
 */

void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr)
{
	struct link *link;
	struct tipc_media_addr media_addr;
	struct tipc_msg *msg = buf_msg(buf);
	u32 dest = msg_dest_domain(msg);
	u32 orig = msg_prevnode(msg);
	u32 net_id = msg_bc_netid(msg);
	u32 type = msg_type(msg);

	msg_get_media_addr(msg,&media_addr);
	msg_dbg(msg, "RECV:");
	buf_discard(buf);

	if (net_id != tipc_net_id)
		return;
	if (!tipc_addr_domain_valid(dest))
		return;
	if (!tipc_addr_node_valid(orig))
		return;
	if (orig == tipc_own_addr) {
		if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr)))
			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
		return;
	}
	if (!tipc_in_scope(dest, tipc_own_addr))
		return;
	if (is_slave(tipc_own_addr) && is_slave(orig))
		return;
	if (is_slave(orig) && !in_own_cluster(orig))
		return;
	if (in_own_cluster(orig)) {
		/* Always accept link here */
		struct sk_buff *rbuf;
		struct tipc_media_addr *addr;
		struct tipc_node *n_ptr = tipc_node_find(orig);
		int link_fully_up;

		dbg(" in own cluster\n");
		if (n_ptr == NULL) {
			n_ptr = tipc_node_create(orig);
			if (!n_ptr)
				return;
		}
		spin_lock_bh(&n_ptr->lock);

		/* Don't talk to neighbor during cleanup after last session */

		if (n_ptr->cleanup_required) {
			spin_unlock_bh(&n_ptr->lock);
			return;
		}

		link = n_ptr->links[b_ptr->identity];
		if (!link) {
			dbg("creating link\n");
			link = tipc_link_create(b_ptr, orig, &media_addr);
			if (!link) {
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
		}
		addr = &link->media_addr;
		if (memcmp(addr, &media_addr, sizeof(*addr))) {
			if (tipc_link_is_up(link) || (!link->started)) {
				disc_dupl_alert(b_ptr, orig, &media_addr);
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
			warn("Resetting link <%s>, peer interface address changed\n",
			     link->name);
			memcpy(addr, &media_addr, sizeof(*addr));
			tipc_link_reset(link);
		}
		link_fully_up = link_working_working(link);
		spin_unlock_bh(&n_ptr->lock);
		if ((type == DSC_RESP_MSG) || link_fully_up)
			return;
		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
		if (rbuf != NULL) {
			msg_dbg(buf_msg(rbuf),"SEND:");
			b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
			buf_discard(rbuf);
		}
	}
}

/**
 * tipc_disc_stop_link_req - stop sending periodic link setup requests
 * @req: ptr to link request structure
 */

void tipc_disc_stop_link_req(struct link_req *req)
{
	if (!req)
		return;

	k_cancel_timer(&req->timer);
	k_term_timer(&req->timer);
	buf_discard(req->buf);
	kfree(req);
}

/**
 * tipc_disc_update_link_req - update frequency of periodic link setup requests
 * @req: ptr to link request structure
 */

void tipc_disc_update_link_req(struct link_req *req)
{
	if (!req)
		return;

	if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
		if (!req->bearer->nodes.count) {
			req->timer_intv = TIPC_LINK_REQ_FAST;
			k_start_timer(&req->timer, req->timer_intv);
		}
	} else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
		if (req->bearer->nodes.count) {
			req->timer_intv = TIPC_LINK_REQ_SLOW;
			k_start_timer(&req->timer, req->timer_intv);
		}
	} else {
		/* leave timer "as is" if haven't yet reached a "normal" rate */
	}
}

/**
 * disc_timeout - send a periodic link setup request
 * @req: ptr to link request structure
 *
 * Called whenever a link setup request timer associated with a bearer expires.
 */

static void disc_timeout(struct link_req *req)
{
	spin_lock_bh(&req->bearer->publ.lock);

	req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest);

	if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
	    (req->timer_intv == TIPC_LINK_REQ_FAST)) {
		/* leave timer interval "as is" if already at a "normal" rate */
	} else {
		req->timer_intv *= 2;
		if (req->timer_intv > TIPC_LINK_REQ_FAST)
			req->timer_intv = TIPC_LINK_REQ_FAST;
		if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
		    (req->bearer->nodes.count))
			req->timer_intv = TIPC_LINK_REQ_SLOW;
	}
	k_start_timer(&req->timer, req->timer_intv);

	spin_unlock_bh(&req->bearer->publ.lock);
}

/**
 * tipc_disc_init_link_req - start sending periodic link setup requests
 * @b_ptr: ptr to bearer issuing requests
 * @dest: destination address for request messages
 * @dest_domain: network domain of node(s) which should respond to message
 * @req_links: max number of desired links
 *
 * Returns pointer to link request structure, or NULL if unable to create.
 */

struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr,
					 const struct tipc_media_addr *dest,
					 u32 dest_domain,
					 u32 req_links)
{
	struct link_req *req;

	req = kmalloc(sizeof(*req), GFP_ATOMIC);
	if (!req)
		return NULL;

	req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
	if (!req->buf) {
		kfree(req);
		return NULL;
	}

	memcpy(&req->dest, dest, sizeof(*dest));
	req->bearer = b_ptr;
	req->timer_intv = TIPC_LINK_REQ_INIT;
	k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
	k_start_timer(&req->timer, req->timer_intv);
	return req;
}
Commit	Line	Data
b97bf3fd PL	1	/*
b97bf3fd PL	2	* net/tipc/discover.c
c4307285	3	*
9da1c8b6	4	* Copyright (c) 2003-2006, Ericsson AB
3ba07e65	5	* Copyright (c) 2005-2006, Wind River Systems
b97bf3fd PL	6	* All rights reserved.
b97bf3fd PL	7	*
9ea1fd3c	8	* Redistribution and use in source and binary forms, with or without
b97bf3fd PL	9	* modification, are permitted provided that the following conditions are met:
b97bf3fd PL	10	*
9ea1fd3c PL	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
	16	* 3. Neither the names of the copyright holders nor the names of its
	17	* contributors may be used to endorse or promote products derived from
	18	* this software without specific prior written permission.
b97bf3fd	19	*
9ea1fd3c PL	20	* Alternatively, this software may be distributed under the terms of the
	21	* GNU General Public License ("GPL") version 2 as published by the Free
	22	* Software Foundation.
	23	*
	24	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	25	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	28	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	29	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	30	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	31	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	32	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	33	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
b97bf3fd PL	34	* POSSIBILITY OF SUCH DAMAGE.
	35	*/
	36
	37	#include "core.h"
	38	#include "dbg.h"
	39	#include "link.h"
	40	#include "zone.h"
	41	#include "discover.h"
	42	#include "port.h"
	43	#include "name_table.h"
	44
	45	#define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */
	46	#define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */
	47	#define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */
	48
c4307285	49	/*
b97bf3fd PL	50	* TODO: Most of the inter-cluster setup stuff should be
b97bf3fd PL	51	* rewritten, and be made conformant with specification.
c4307285	52	*/
b97bf3fd PL	53
	54
	55	/**
	56	* struct link_req - information about an ongoing link setup request
	57	* @bearer: bearer issuing requests
	58	* @dest: destination address for request messages
	59	* @buf: request message to be (repeatedly) sent
	60	* @timer: timer governing period between requests
	61	* @timer_intv: current interval between requests (in ms)
	62	*/
	63	struct link_req {
	64	struct bearer *bearer;
	65	struct tipc_media_addr dest;
	66	struct sk_buff *buf;
	67	struct timer_list timer;
	68	unsigned int timer_intv;
	69	};
	70
c4307285	71	/**
4323add6	72	* tipc_disc_init_msg - initialize a link setup message
b97bf3fd PL	73	* @type: message type (request or response)
	74	* @req_links: number of links associated with message
	75	* @dest_domain: network domain of node(s) which should respond to message
	76	* @b_ptr: ptr to bearer issuing message
	77	*/
	78
988f088a AB	79	static struct sk_buff *tipc_disc_init_msg(u32 type,
	80	u32 req_links,
	81	u32 dest_domain,
	82	struct bearer *b_ptr)
b97bf3fd	83	{
31e3c3f6	84	struct sk_buff *buf = tipc_buf_acquire(DSC_H_SIZE);
b97bf3fd PL	85	struct tipc_msg *msg;
	86
	87	if (buf) {
	88	msg = buf_msg(buf);
c68ca7b7	89	tipc_msg_init(msg, LINK_CONFIG, type, DSC_H_SIZE, dest_domain);
40aecb1b	90	msg_set_non_seq(msg, 1);
b97bf3fd PL	91	msg_set_req_links(msg, req_links);
	92	msg_set_dest_domain(msg, dest_domain);
	93	msg_set_bc_netid(msg, tipc_net_id);
	94	msg_set_media_addr(msg, &b_ptr->publ.addr);
	95	}
	96	return buf;
	97	}
	98
e91ed0bc AS	99	/**
	100	* disc_dupl_alert - issue node address duplication alert
	101	* @b_ptr: pointer to bearer detecting duplication
	102	* @node_addr: duplicated node address
	103	* @media_addr: media address advertised by duplicated node
	104	*/
	105
	106	static void disc_dupl_alert(struct bearer *b_ptr, u32 node_addr,
	107	struct tipc_media_addr *media_addr)
	108	{
	109	char node_addr_str[16];
	110	char media_addr_str[64];
	111	struct print_buf pb;
	112
c68ca7b7	113	tipc_addr_string_fill(node_addr_str, node_addr);
e91ed0bc AS	114	tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str));
	115	tipc_media_addr_printf(&pb, media_addr);
	116	tipc_printbuf_validate(&pb);
	117	warn("Duplicate %s using %s seen on <%s>\n",
	118	node_addr_str, media_addr_str, b_ptr->publ.name);
	119	}
	120
b97bf3fd	121	/**
4323add6	122	* tipc_disc_recv_msg - handle incoming link setup message (request or response)
b97bf3fd	123	* @buf: buffer containing message
1265a021	124	* @b_ptr: bearer that message arrived on
b97bf3fd PL	125	*/
b97bf3fd PL	126
1265a021	127	void tipc_disc_recv_msg(struct sk_buff buf, struct bearer b_ptr)
b97bf3fd	128	{
b97bf3fd PL	129	struct link *link;
	130	struct tipc_media_addr media_addr;
	131	struct tipc_msg *msg = buf_msg(buf);
	132	u32 dest = msg_dest_domain(msg);
	133	u32 orig = msg_prevnode(msg);
	134	u32 net_id = msg_bc_netid(msg);
	135	u32 type = msg_type(msg);
	136
	137	msg_get_media_addr(msg,&media_addr);
	138	msg_dbg(msg, "RECV:");
	139	buf_discard(buf);
	140
	141	if (net_id != tipc_net_id)
	142	return;
4323add6	143	if (!tipc_addr_domain_valid(dest))
b97bf3fd	144	return;
4323add6	145	if (!tipc_addr_node_valid(orig))
b97bf3fd	146	return;
e91ed0bc AS	147	if (orig == tipc_own_addr) {
	148	if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr)))
	149	disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
b97bf3fd	150	return;
e91ed0bc	151	}
c68ca7b7	152	if (!tipc_in_scope(dest, tipc_own_addr))
b97bf3fd PL	153	return;
	154	if (is_slave(tipc_own_addr) && is_slave(orig))
	155	return;
	156	if (is_slave(orig) && !in_own_cluster(orig))
	157	return;
	158	if (in_own_cluster(orig)) {
	159	/* Always accept link here */
	160	struct sk_buff *rbuf;
	161	struct tipc_media_addr *addr;
6c00055a	162	struct tipc_node *n_ptr = tipc_node_find(orig);
2de07f61 AS	163	int link_fully_up;
2de07f61 AS	164
b97bf3fd PL	165	dbg(" in own cluster\n");
b97bf3fd PL	166	if (n_ptr == NULL) {
4323add6	167	n_ptr = tipc_node_create(orig);
811102ca AS	168	if (!n_ptr)
811102ca AS	169	return;
b97bf3fd PL	170	}
b97bf3fd PL	171	spin_lock_bh(&n_ptr->lock);
5a68d5ee AS	172
	173	/* Don't talk to neighbor during cleanup after last session */
	174
	175	if (n_ptr->cleanup_required) {
	176	spin_unlock_bh(&n_ptr->lock);
	177	return;
	178	}
	179
b97bf3fd PL	180	link = n_ptr->links[b_ptr->identity];
	181	if (!link) {
	182	dbg("creating link\n");
4323add6	183	link = tipc_link_create(b_ptr, orig, &media_addr);
b97bf3fd	184	if (!link) {
c4307285	185	spin_unlock_bh(&n_ptr->lock);
b97bf3fd PL	186	return;
	187	}
	188	}
	189	addr = &link->media_addr;
	190	if (memcmp(addr, &media_addr, sizeof(*addr))) {
e91ed0bc AS	191	if (tipc_link_is_up(link) \|\| (!link->started)) {
	192	disc_dupl_alert(b_ptr, orig, &media_addr);
	193	spin_unlock_bh(&n_ptr->lock);
	194	return;
	195	}
a10bd924 AS	196	warn("Resetting link <%s>, peer interface address changed\n",
a10bd924 AS	197	link->name);
b97bf3fd	198	memcpy(addr, &media_addr, sizeof(*addr));
c4307285	199	tipc_link_reset(link);
b97bf3fd	200	}
01fee256	201	link_fully_up = link_working_working(link);
c4307285	202	spin_unlock_bh(&n_ptr->lock);
2de07f61	203	if ((type == DSC_RESP_MSG) \|\| link_fully_up)
b97bf3fd	204	return;
4323add6	205	rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
b97bf3fd PL	206	if (rbuf != NULL) {
	207	msg_dbg(buf_msg(rbuf),"SEND:");
	208	b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
	209	buf_discard(rbuf);
	210	}
	211	}
	212	}
	213
	214	/**
4323add6	215	* tipc_disc_stop_link_req - stop sending periodic link setup requests
b97bf3fd PL	216	* @req: ptr to link request structure
	217	*/
	218
c4307285	219	void tipc_disc_stop_link_req(struct link_req *req)
b97bf3fd PL	220	{
	221	if (!req)
	222	return;
c4307285	223
b97bf3fd PL	224	k_cancel_timer(&req->timer);
	225	k_term_timer(&req->timer);
	226	buf_discard(req->buf);
	227	kfree(req);
c4307285	228	}
b97bf3fd PL	229
b97bf3fd PL	230	/**
4323add6	231	* tipc_disc_update_link_req - update frequency of periodic link setup requests
b97bf3fd PL	232	* @req: ptr to link request structure
	233	*/
	234
c4307285	235	void tipc_disc_update_link_req(struct link_req *req)
b97bf3fd PL	236	{
	237	if (!req)
	238	return;
	239
	240	if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
	241	if (!req->bearer->nodes.count) {
	242	req->timer_intv = TIPC_LINK_REQ_FAST;
	243	k_start_timer(&req->timer, req->timer_intv);
	244	}
	245	} else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
	246	if (req->bearer->nodes.count) {
	247	req->timer_intv = TIPC_LINK_REQ_SLOW;
	248	k_start_timer(&req->timer, req->timer_intv);
	249	}
	250	} else {
	251	/* leave timer "as is" if haven't yet reached a "normal" rate */
	252	}
c4307285	253	}
b97bf3fd PL	254
	255	/**
	256	* disc_timeout - send a periodic link setup request
	257	* @req: ptr to link request structure
c4307285	258	*
b97bf3fd PL	259	* Called whenever a link setup request timer associated with a bearer expires.
	260	*/
	261
c4307285	262	static void disc_timeout(struct link_req *req)
b97bf3fd	263	{
b97bf3fd PL	264	spin_lock_bh(&req->bearer->publ.lock);
b97bf3fd PL	265
b97bf3fd PL	266	req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest);
	267
	268	if ((req->timer_intv == TIPC_LINK_REQ_SLOW) \|\|
	269	(req->timer_intv == TIPC_LINK_REQ_FAST)) {
	270	/* leave timer interval "as is" if already at a "normal" rate */
	271	} else {
	272	req->timer_intv *= 2;
3ba07e65 AS	273	if (req->timer_intv > TIPC_LINK_REQ_FAST)
3ba07e65 AS	274	req->timer_intv = TIPC_LINK_REQ_FAST;
c4307285	275	if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
b97bf3fd PL	276	(req->bearer->nodes.count))
	277	req->timer_intv = TIPC_LINK_REQ_SLOW;
	278	}
	279	k_start_timer(&req->timer, req->timer_intv);
	280
	281	spin_unlock_bh(&req->bearer->publ.lock);
	282	}
	283
	284	/**
4323add6	285	* tipc_disc_init_link_req - start sending periodic link setup requests
b97bf3fd PL	286	* @b_ptr: ptr to bearer issuing requests
	287	* @dest: destination address for request messages
	288	* @dest_domain: network domain of node(s) which should respond to message
	289	* @req_links: max number of desired links
c4307285	290	*
b97bf3fd PL	291	* Returns pointer to link request structure, or NULL if unable to create.
	292	*/
	293
c4307285	294	struct link_req tipc_disc_init_link_req(struct bearer b_ptr,
4323add6 PL	295	const struct tipc_media_addr *dest,
4323add6 PL	296	u32 dest_domain,
c4307285	297	u32 req_links)
b97bf3fd PL	298	{
	299	struct link_req *req;
	300
9df3f3d2	301	req = kmalloc(sizeof(*req), GFP_ATOMIC);
b97bf3fd PL	302	if (!req)
	303	return NULL;
	304
4323add6	305	req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
b97bf3fd PL	306	if (!req->buf) {
	307	kfree(req);
	308	return NULL;
	309	}
	310
	311	memcpy(&req->dest, dest, sizeof(*dest));
	312	req->bearer = b_ptr;
	313	req->timer_intv = TIPC_LINK_REQ_INIT;
	314	k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
	315	k_start_timer(&req->timer, req->timer_intv);
	316	return req;
c4307285	317	}
b97bf3fd	318