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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/discover.c
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Per Liden9da1c8b2006-01-11 18:40:41 +01004 * Copyright (c) 2003-2006, Ericsson AB
Allan Stephens2d627b92011-01-07 13:00:11 -05005 * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "link.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "discover.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040
41#define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */
Allan Stephens972a77f2011-04-21 20:34:03 -050042#define TIPC_LINK_REQ_FAST 1000 /* max delay if bearer has no links */
43#define TIPC_LINK_REQ_SLOW 60000 /* max delay if bearer has links */
44#define TIPC_LINK_REQ_INACTIVE 0xffffffff /* indicates no timer in use */
Per Lidenb97bf3f2006-01-02 19:04:38 +010045
46
47/**
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050048 * struct tipc_link_req - information about an ongoing link setup request
Per Lidenb97bf3f2006-01-02 19:04:38 +010049 * @bearer: bearer issuing requests
50 * @dest: destination address for request messages
Allan Stephens66e019a2011-04-20 16:24:07 -050051 * @domain: network domain to which links can be established
Allan Stephens12099662011-04-21 19:05:25 -050052 * @num_nodes: number of nodes currently discovered (i.e. with an active link)
Per Lidenb97bf3f2006-01-02 19:04:38 +010053 * @buf: request message to be (repeatedly) sent
54 * @timer: timer governing period between requests
55 * @timer_intv: current interval between requests (in ms)
56 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050057struct tipc_link_req {
Allan Stephens2d627b92011-01-07 13:00:11 -050058 struct tipc_bearer *bearer;
Per Lidenb97bf3f2006-01-02 19:04:38 +010059 struct tipc_media_addr dest;
Allan Stephens66e019a2011-04-20 16:24:07 -050060 u32 domain;
Allan Stephens12099662011-04-21 19:05:25 -050061 int num_nodes;
Per Lidenb97bf3f2006-01-02 19:04:38 +010062 struct sk_buff *buf;
63 struct timer_list timer;
64 unsigned int timer_intv;
65};
66
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090067/**
Per Liden4323add2006-01-18 00:38:21 +010068 * tipc_disc_init_msg - initialize a link setup message
Per Lidenb97bf3f2006-01-02 19:04:38 +010069 * @type: message type (request or response)
Per Lidenb97bf3f2006-01-02 19:04:38 +010070 * @dest_domain: network domain of node(s) which should respond to message
71 * @b_ptr: ptr to bearer issuing message
72 */
73
Adrian Bunk988f0882006-03-20 22:37:52 -080074static struct sk_buff *tipc_disc_init_msg(u32 type,
Adrian Bunk988f0882006-03-20 22:37:52 -080075 u32 dest_domain,
Allan Stephens2d627b92011-01-07 13:00:11 -050076 struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +010077{
Allan Stephensd901a422011-02-28 16:02:30 -050078 struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE);
Per Lidenb97bf3f2006-01-02 19:04:38 +010079 struct tipc_msg *msg;
80
81 if (buf) {
82 msg = buf_msg(buf);
Allan Stephensd901a422011-02-28 16:02:30 -050083 tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain);
Allan Stephens40aecb12008-06-04 17:54:48 -070084 msg_set_non_seq(msg, 1);
Allan Stephensfc0eea62011-10-28 16:26:41 -040085 msg_set_node_sig(msg, tipc_random);
Per Lidenb97bf3f2006-01-02 19:04:38 +010086 msg_set_dest_domain(msg, dest_domain);
87 msg_set_bc_netid(msg, tipc_net_id);
Allan Stephens3d749a62011-10-07 15:19:11 -040088 b_ptr->media->addr2msg(&b_ptr->addr, msg_media_addr(msg));
Per Lidenb97bf3f2006-01-02 19:04:38 +010089 }
90 return buf;
91}
92
93/**
Allan Stephense91ed0b2006-10-16 21:44:59 -070094 * disc_dupl_alert - issue node address duplication alert
95 * @b_ptr: pointer to bearer detecting duplication
96 * @node_addr: duplicated node address
97 * @media_addr: media address advertised by duplicated node
98 */
99
Allan Stephens2d627b92011-01-07 13:00:11 -0500100static void disc_dupl_alert(struct tipc_bearer *b_ptr, u32 node_addr,
Allan Stephense91ed0b2006-10-16 21:44:59 -0700101 struct tipc_media_addr *media_addr)
102{
103 char node_addr_str[16];
104 char media_addr_str[64];
105 struct print_buf pb;
106
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000107 tipc_addr_string_fill(node_addr_str, node_addr);
Allan Stephense91ed0b2006-10-16 21:44:59 -0700108 tipc_printbuf_init(&pb, media_addr_str, sizeof(media_addr_str));
109 tipc_media_addr_printf(&pb, media_addr);
110 tipc_printbuf_validate(&pb);
111 warn("Duplicate %s using %s seen on <%s>\n",
Allan Stephens2d627b92011-01-07 13:00:11 -0500112 node_addr_str, media_addr_str, b_ptr->name);
Allan Stephense91ed0b2006-10-16 21:44:59 -0700113}
114
115/**
Per Liden4323add2006-01-18 00:38:21 +0100116 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117 * @buf: buffer containing message
Allan Stephens1265a022008-06-04 17:32:35 -0700118 * @b_ptr: bearer that message arrived on
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119 */
120
Allan Stephens2d627b92011-01-07 13:00:11 -0500121void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122{
Allan Stephensa7287502011-02-28 10:03:05 -0500123 struct tipc_node *n_ptr;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500124 struct tipc_link *link;
Allan Stephens97878a42011-10-28 17:30:08 -0400125 struct tipc_media_addr media_addr;
Allan Stephensa7287502011-02-28 10:03:05 -0500126 struct sk_buff *rbuf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127 struct tipc_msg *msg = buf_msg(buf);
128 u32 dest = msg_dest_domain(msg);
129 u32 orig = msg_prevnode(msg);
130 u32 net_id = msg_bc_netid(msg);
131 u32 type = msg_type(msg);
Allan Stephensfc0eea62011-10-28 16:26:41 -0400132 u32 signature = msg_node_sig(msg);
Allan Stephens97878a42011-10-28 17:30:08 -0400133 int addr_mismatch;
Allan Stephensa7287502011-02-28 10:03:05 -0500134 int link_fully_up;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100135
Allan Stephensd6d45772011-10-07 15:48:41 -0400136 media_addr.broadcast = 1;
Allan Stephens3d749a62011-10-07 15:19:11 -0400137 b_ptr->media->msg2addr(&media_addr, msg_media_addr(msg));
Allan Stephens5f6d9122011-11-04 13:24:29 -0400138 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100139
Allan Stephens97878a42011-10-28 17:30:08 -0400140 /* Ensure message from node is valid and communication is permitted */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100141 if (net_id != tipc_net_id)
142 return;
Allan Stephensd6d45772011-10-07 15:48:41 -0400143 if (media_addr.broadcast)
144 return;
Per Liden4323add2006-01-18 00:38:21 +0100145 if (!tipc_addr_domain_valid(dest))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100146 return;
Per Liden4323add2006-01-18 00:38:21 +0100147 if (!tipc_addr_node_valid(orig))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148 return;
Allan Stephense91ed0b2006-10-16 21:44:59 -0700149 if (orig == tipc_own_addr) {
Allan Stephens2d627b92011-01-07 13:00:11 -0500150 if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr)))
Allan Stephense91ed0b2006-10-16 21:44:59 -0700151 disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152 return;
Allan Stephense91ed0b2006-10-16 21:44:59 -0700153 }
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000154 if (!tipc_in_scope(dest, tipc_own_addr))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100155 return;
Allan Stephens66e019a2011-04-20 16:24:07 -0500156 if (!tipc_in_scope(b_ptr->link_req->domain, orig))
Allan Stephensa7287502011-02-28 10:03:05 -0500157 return;
Allan Stephens2de07f62006-10-16 21:57:13 -0700158
Allan Stephensa7287502011-02-28 10:03:05 -0500159 /* Locate structure corresponding to requesting node */
160 n_ptr = tipc_node_find(orig);
161 if (!n_ptr) {
162 n_ptr = tipc_node_create(orig);
163 if (!n_ptr)
Allan Stephens5a68d5e2010-08-17 11:00:16 +0000164 return;
Allan Stephensa7287502011-02-28 10:03:05 -0500165 }
166 tipc_node_lock(n_ptr);
Allan Stephens5a68d5e2010-08-17 11:00:16 +0000167
Allan Stephens97878a42011-10-28 17:30:08 -0400168 /* Prepare to validate requesting node's signature and media address */
Allan Stephensa7287502011-02-28 10:03:05 -0500169 link = n_ptr->links[b_ptr->identity];
Allan Stephens97878a42011-10-28 17:30:08 -0400170 addr_mismatch = (link != NULL) &&
171 memcmp(&link->media_addr, &media_addr, sizeof(media_addr));
Allan Stephensa7287502011-02-28 10:03:05 -0500172
Allan Stephens97878a42011-10-28 17:30:08 -0400173 /*
174 * Ensure discovery message's signature is correct
175 *
176 * If signature is incorrect and there is no working link to the node,
177 * accept the new signature but invalidate all existing links to the
178 * node so they won't re-activate without a new discovery message.
179 *
180 * If signature is incorrect and the requested link to the node is
181 * working, accept the new signature. (This is an instance of delayed
182 * rediscovery, where a link endpoint was able to re-establish contact
183 * with its peer endpoint on a node that rebooted before receiving a
184 * discovery message from that node.)
185 *
186 * If signature is incorrect and there is a working link to the node
187 * that is not the requested link, reject the request (must be from
188 * a duplicate node).
189 */
190 if (signature != n_ptr->signature) {
191 if (n_ptr->working_links == 0) {
192 struct tipc_link *curr_link;
193 int i;
194
195 for (i = 0; i < MAX_BEARERS; i++) {
196 curr_link = n_ptr->links[i];
197 if (curr_link) {
198 memset(&curr_link->media_addr, 0,
199 sizeof(media_addr));
200 tipc_link_reset(curr_link);
201 }
202 }
203 addr_mismatch = (link != NULL);
204 } else if (tipc_link_is_up(link) && !addr_mismatch) {
205 /* delayed rediscovery */
206 } else {
207 disc_dupl_alert(b_ptr, orig, &media_addr);
Allan Stephensa7287502011-02-28 10:03:05 -0500208 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100209 return;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100210 }
Allan Stephens97878a42011-10-28 17:30:08 -0400211 n_ptr->signature = signature;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100212 }
Allan Stephensa7287502011-02-28 10:03:05 -0500213
214 /*
215 * Ensure requesting node's media address is correct
216 *
217 * If media address doesn't match and the link is working, reject the
218 * request (must be from a duplicate node).
219 *
220 * If media address doesn't match and the link is not working, accept
221 * the new media address and reset the link to ensure it starts up
222 * cleanly.
223 */
Allan Stephens97878a42011-10-28 17:30:08 -0400224
225 if (addr_mismatch) {
226 if (tipc_link_is_up(link)) {
Allan Stephensa7287502011-02-28 10:03:05 -0500227 disc_dupl_alert(b_ptr, orig, &media_addr);
228 tipc_node_unlock(n_ptr);
229 return;
Allan Stephens97878a42011-10-28 17:30:08 -0400230 } else {
231 memcpy(&link->media_addr, &media_addr,
232 sizeof(media_addr));
233 tipc_link_reset(link);
Allan Stephensa7287502011-02-28 10:03:05 -0500234 }
Allan Stephens97878a42011-10-28 17:30:08 -0400235 }
236
237 /* Create a link endpoint for this bearer, if necessary */
238 if (!link) {
239 link = tipc_link_create(n_ptr, b_ptr, &media_addr);
240 if (!link) {
241 tipc_node_unlock(n_ptr);
242 return;
243 }
Allan Stephensa7287502011-02-28 10:03:05 -0500244 }
245
246 /* Accept discovery message & send response, if necessary */
247 link_fully_up = link_working_working(link);
Allan Stephensfa2bae22011-02-28 10:56:23 -0500248
Allan Stephensf9107eb2011-02-28 11:04:08 -0500249 if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
Allan Stephensfa2bae22011-02-28 10:56:23 -0500250 rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr);
251 if (rbuf) {
252 b_ptr->media->send_msg(rbuf, b_ptr, &media_addr);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400253 kfree_skb(rbuf);
Allan Stephensfa2bae22011-02-28 10:56:23 -0500254 }
Allan Stephensa7287502011-02-28 10:03:05 -0500255 }
Allan Stephensfa2bae22011-02-28 10:56:23 -0500256
257 tipc_node_unlock(n_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100258}
259
260/**
Allan Stephens12099662011-04-21 19:05:25 -0500261 * disc_update - update frequency of periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100262 * @req: ptr to link request structure
Allan Stephens972a77f2011-04-21 20:34:03 -0500263 *
264 * Reinitiates discovery process if discovery object has no associated nodes
265 * and is either not currently searching or is searching at a slow rate
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266 */
267
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500268static void disc_update(struct tipc_link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100269{
Allan Stephens972a77f2011-04-21 20:34:03 -0500270 if (!req->num_nodes) {
271 if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
272 (req->timer_intv > TIPC_LINK_REQ_FAST)) {
273 req->timer_intv = TIPC_LINK_REQ_INIT;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100274 k_start_timer(&req->timer, req->timer_intv);
275 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100276 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900277}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100278
279/**
Allan Stephens12099662011-04-21 19:05:25 -0500280 * tipc_disc_add_dest - increment set of discovered nodes
281 * @req: ptr to link request structure
282 */
283
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500284void tipc_disc_add_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500285{
286 req->num_nodes++;
Allan Stephens12099662011-04-21 19:05:25 -0500287}
288
289/**
290 * tipc_disc_remove_dest - decrement set of discovered nodes
291 * @req: ptr to link request structure
292 */
293
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500294void tipc_disc_remove_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500295{
296 req->num_nodes--;
297 disc_update(req);
298}
299
300/**
Allan Stephens691a6202011-04-21 16:28:02 -0500301 * disc_send_msg - send link setup request message
302 * @req: ptr to link request structure
303 */
304
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500305static void disc_send_msg(struct tipc_link_req *req)
Allan Stephens691a6202011-04-21 16:28:02 -0500306{
307 if (!req->bearer->blocked)
308 tipc_bearer_send(req->bearer, req->buf, &req->dest);
309}
310
311/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100312 * disc_timeout - send a periodic link setup request
313 * @req: ptr to link request structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900314 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100315 * Called whenever a link setup request timer associated with a bearer expires.
316 */
317
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500318static void disc_timeout(struct tipc_link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319{
Allan Stephens972a77f2011-04-21 20:34:03 -0500320 int max_delay;
321
Allan Stephens2d627b92011-01-07 13:00:11 -0500322 spin_lock_bh(&req->bearer->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323
Allan Stephens972a77f2011-04-21 20:34:03 -0500324 /* Stop searching if only desired node has been found */
325
326 if (tipc_node(req->domain) && req->num_nodes) {
327 req->timer_intv = TIPC_LINK_REQ_INACTIVE;
328 goto exit;
329 }
330
331 /*
332 * Send discovery message, then update discovery timer
333 *
334 * Keep doubling time between requests until limit is reached;
335 * hold at fast polling rate if don't have any associated nodes,
336 * otherwise hold at slow polling rate
337 */
338
Allan Stephens691a6202011-04-21 16:28:02 -0500339 disc_send_msg(req);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340
Allan Stephens972a77f2011-04-21 20:34:03 -0500341 req->timer_intv *= 2;
342 if (req->num_nodes)
343 max_delay = TIPC_LINK_REQ_SLOW;
344 else
345 max_delay = TIPC_LINK_REQ_FAST;
346 if (req->timer_intv > max_delay)
347 req->timer_intv = max_delay;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100348
Allan Stephens972a77f2011-04-21 20:34:03 -0500349 k_start_timer(&req->timer, req->timer_intv);
350exit:
Allan Stephens2d627b92011-01-07 13:00:11 -0500351 spin_unlock_bh(&req->bearer->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352}
353
354/**
Allan Stephens3a777ff2011-04-21 13:58:26 -0500355 * tipc_disc_create - create object to send periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356 * @b_ptr: ptr to bearer issuing requests
357 * @dest: destination address for request messages
Allan Stephens66e019a2011-04-20 16:24:07 -0500358 * @dest_domain: network domain to which links can be established
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900359 *
Allan Stephens3a777ff2011-04-21 13:58:26 -0500360 * Returns 0 if successful, otherwise -errno.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100361 */
362
Allan Stephens3a777ff2011-04-21 13:58:26 -0500363int tipc_disc_create(struct tipc_bearer *b_ptr,
364 struct tipc_media_addr *dest, u32 dest_domain)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100365{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500366 struct tipc_link_req *req;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100367
Panagiotis Issaris9df3f3d2006-07-21 15:52:20 -0700368 req = kmalloc(sizeof(*req), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100369 if (!req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500370 return -ENOMEM;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100371
Allan Stephens2e07dda2011-01-25 14:39:59 -0500372 req->buf = tipc_disc_init_msg(DSC_REQ_MSG, dest_domain, b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 if (!req->buf) {
374 kfree(req);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500375 return -ENOMSG;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100376 }
377
378 memcpy(&req->dest, dest, sizeof(*dest));
379 req->bearer = b_ptr;
Allan Stephens66e019a2011-04-20 16:24:07 -0500380 req->domain = dest_domain;
Allan Stephens12099662011-04-21 19:05:25 -0500381 req->num_nodes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100382 req->timer_intv = TIPC_LINK_REQ_INIT;
383 k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
384 k_start_timer(&req->timer, req->timer_intv);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500385 b_ptr->link_req = req;
Allan Stephens691a6202011-04-21 16:28:02 -0500386 disc_send_msg(req);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500387 return 0;
388}
389
390/**
391 * tipc_disc_delete - destroy object sending periodic link setup requests
392 * @req: ptr to link request structure
393 */
394
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500395void tipc_disc_delete(struct tipc_link_req *req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500396{
397 k_cancel_timer(&req->timer);
398 k_term_timer(&req->timer);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400399 kfree_skb(req->buf);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500400 kfree(req);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900401}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402