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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 *
Jon Paul Maloyb45db712015-02-03 08:59:19 -05004 * Copyright (c) 2003-2006, 2014-2015, 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"
Jon Paul Maloyd3a43b92015-07-16 16:54:20 -040038#include "node.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010039#include "discover.h"
Per Lidenb97bf3f2006-01-02 19:04:38 +010040
Ying Xue2f55c432015-01-09 15:27:00 +080041/* min delay during bearer start up */
42#define TIPC_LINK_REQ_INIT msecs_to_jiffies(125)
43/* max delay if bearer has no links */
44#define TIPC_LINK_REQ_FAST msecs_to_jiffies(1000)
45/* max delay if bearer has links */
46#define TIPC_LINK_REQ_SLOW msecs_to_jiffies(60000)
47/* indicates no timer in use */
48#define TIPC_LINK_REQ_INACTIVE 0xffffffff
Per Lidenb97bf3f2006-01-02 19:04:38 +010049
Per Lidenb97bf3f2006-01-02 19:04:38 +010050/**
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050051 * struct tipc_link_req - information about an ongoing link setup request
Ying Xue7a2f7d12014-04-21 10:55:46 +080052 * @bearer_id: identity of bearer issuing requests
Ying Xue7f9f95d2015-01-09 15:27:06 +080053 * @net: network namespace instance
Per Lidenb97bf3f2006-01-02 19:04:38 +010054 * @dest: destination address for request messages
Ying Xue7a2f7d12014-04-21 10:55:46 +080055 * @domain: network domain to which links can be established
Allan Stephens12099662011-04-21 19:05:25 -050056 * @num_nodes: number of nodes currently discovered (i.e. with an active link)
Ying Xuef9a2c802014-01-07 17:02:43 -050057 * @lock: spinlock for controlling access to requests
Per Lidenb97bf3f2006-01-02 19:04:38 +010058 * @buf: request message to be (repeatedly) sent
59 * @timer: timer governing period between requests
60 * @timer_intv: current interval between requests (in ms)
61 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -050062struct tipc_link_req {
Ying Xue7a2f7d12014-04-21 10:55:46 +080063 u32 bearer_id;
Per Lidenb97bf3f2006-01-02 19:04:38 +010064 struct tipc_media_addr dest;
Ying Xue7f9f95d2015-01-09 15:27:06 +080065 struct net *net;
Ying Xue7a2f7d12014-04-21 10:55:46 +080066 u32 domain;
Allan Stephens12099662011-04-21 19:05:25 -050067 int num_nodes;
Ying Xuef9a2c802014-01-07 17:02:43 -050068 spinlock_t lock;
Per Lidenb97bf3f2006-01-02 19:04:38 +010069 struct sk_buff *buf;
70 struct timer_list timer;
Ying Xue2f55c432015-01-09 15:27:00 +080071 unsigned long timer_intv;
Per Lidenb97bf3f2006-01-02 19:04:38 +010072};
73
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090074/**
Per Liden4323add2006-01-18 00:38:21 +010075 * tipc_disc_init_msg - initialize a link setup message
Ying Xuec93d3ba2015-01-09 15:27:04 +080076 * @net: the applicable net namespace
Per Lidenb97bf3f2006-01-02 19:04:38 +010077 * @type: message type (request or response)
Jon Paul Maloy1a906322015-11-19 14:30:47 -050078 * @b: ptr to bearer issuing message
Per Lidenb97bf3f2006-01-02 19:04:38 +010079 */
Ying Xuec93d3ba2015-01-09 15:27:04 +080080static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type,
Jon Paul Maloy1a906322015-11-19 14:30:47 -050081 struct tipc_bearer *b)
Per Lidenb97bf3f2006-01-02 19:04:38 +010082{
Ying Xuec93d3ba2015-01-09 15:27:04 +080083 struct tipc_net *tn = net_generic(net, tipc_net_id);
Per Lidenb97bf3f2006-01-02 19:04:38 +010084 struct tipc_msg *msg;
Jon Paul Maloy1a906322015-11-19 14:30:47 -050085 u32 dest_domain = b->domain;
Per Lidenb97bf3f2006-01-02 19:04:38 +010086
Ying Xuea8b9b962014-04-21 10:55:52 +080087 msg = buf_msg(buf);
Jon Paul Maloyc5898632015-02-05 08:36:36 -050088 tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type,
Erik Hugne948fa2d12015-03-05 10:23:48 +010089 MAX_H_SIZE, dest_domain);
Ying Xuea8b9b962014-04-21 10:55:52 +080090 msg_set_non_seq(msg, 1);
Ying Xuebafa29e2015-01-09 15:27:12 +080091 msg_set_node_sig(msg, tn->random);
Jon Paul Maloyfd556f22015-10-22 08:51:40 -040092 msg_set_node_capabilities(msg, TIPC_NODE_CAPABILITIES);
Ying Xuea8b9b962014-04-21 10:55:52 +080093 msg_set_dest_domain(msg, dest_domain);
Ying Xuec93d3ba2015-01-09 15:27:04 +080094 msg_set_bc_netid(msg, tn->net_id);
Jon Paul Maloy1a906322015-11-19 14:30:47 -050095 b->media->addr2msg(msg_media_addr(msg), &b->addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +010096}
97
98/**
Allan Stephense91ed0b2006-10-16 21:44:59 -070099 * disc_dupl_alert - issue node address duplication alert
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500100 * @b: pointer to bearer detecting duplication
Allan Stephense91ed0b2006-10-16 21:44:59 -0700101 * @node_addr: duplicated node address
102 * @media_addr: media address advertised by duplicated node
103 */
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500104static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
Allan Stephense91ed0b2006-10-16 21:44:59 -0700105 struct tipc_media_addr *media_addr)
106{
107 char node_addr_str[16];
108 char media_addr_str[64];
Allan Stephense91ed0b2006-10-16 21:44:59 -0700109
Allan Stephensc68ca7b2010-05-11 14:30:12 +0000110 tipc_addr_string_fill(node_addr_str, node_addr);
Erik Hugnedc1aed32012-06-29 00:50:23 -0400111 tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str),
112 media_addr);
Erik Hugne2cf8aa12012-06-29 00:16:37 -0400113 pr_warn("Duplicate %s using %s seen on <%s>\n", node_addr_str,
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500114 media_addr_str, b->name);
Allan Stephense91ed0b2006-10-16 21:44:59 -0700115}
116
117/**
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400118 * tipc_disc_rcv - handle incoming discovery message (request or response)
Ying Xuec93d3ba2015-01-09 15:27:04 +0800119 * @net: the applicable net namespace
Per Lidenb97bf3f2006-01-02 19:04:38 +0100120 * @buf: buffer containing message
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400121 * @bearer: bearer that message arrived on
Per Lidenb97bf3f2006-01-02 19:04:38 +0100122 */
Jon Paul Maloycf148812015-07-30 18:24:22 -0400123void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
Ying Xuec93d3ba2015-01-09 15:27:04 +0800124 struct tipc_bearer *bearer)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100125{
Ying Xuec93d3ba2015-01-09 15:27:04 +0800126 struct tipc_net *tn = net_generic(net, tipc_net_id);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400127 struct tipc_media_addr maddr;
Jon Paul Maloycf148812015-07-30 18:24:22 -0400128 struct sk_buff *rskb;
129 struct tipc_msg *hdr = buf_msg(skb);
130 u32 ddom = msg_dest_domain(hdr);
131 u32 onode = msg_prevnode(hdr);
132 u32 net_id = msg_bc_netid(hdr);
133 u32 mtyp = msg_type(hdr);
134 u32 signature = msg_node_sig(hdr);
135 u16 caps = msg_node_capabilities(hdr);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400136 bool respond = false;
Jon Paul Maloycf148812015-07-30 18:24:22 -0400137 bool dupl_addr = false;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100138
Jon Paul Maloycf148812015-07-30 18:24:22 -0400139 bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr));
140 kfree_skb(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100141
Allan Stephens97878a42011-10-28 17:30:08 -0400142 /* Ensure message from node is valid and communication is permitted */
Ying Xuec93d3ba2015-01-09 15:27:04 +0800143 if (net_id != tn->net_id)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400145 if (maddr.broadcast)
Allan Stephensd6d45772011-10-07 15:48:41 -0400146 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400147 if (!tipc_addr_domain_valid(ddom))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400149 if (!tipc_addr_node_valid(onode))
Allan Stephensa7287502011-02-28 10:03:05 -0500150 return;
Allan Stephens2de07f62006-10-16 21:57:13 -0700151
Ying Xue34747532015-01-09 15:27:10 +0800152 if (in_own_node(net, onode)) {
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400153 if (memcmp(&maddr, &bearer->addr, sizeof(maddr)))
Ying Xue34747532015-01-09 15:27:10 +0800154 disc_dupl_alert(bearer, tn->own_addr, &maddr);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400155 return;
Allan Stephensa7287502011-02-28 10:03:05 -0500156 }
Ying Xue34747532015-01-09 15:27:10 +0800157 if (!tipc_in_scope(ddom, tn->own_addr))
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400158 return;
159 if (!tipc_in_scope(bearer->domain, onode))
160 return;
161
Jon Paul Maloycf148812015-07-30 18:24:22 -0400162 tipc_node_check_dest(net, onode, bearer, caps, signature,
163 &maddr, &respond, &dupl_addr);
164 if (dupl_addr)
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400165 disc_dupl_alert(bearer, onode, &maddr);
Allan Stephens97878a42011-10-28 17:30:08 -0400166
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400167 /* Send response, if necessary */
168 if (respond && (mtyp == DSC_REQ_MSG)) {
Jon Paul Maloycf148812015-07-30 18:24:22 -0400169 rskb = tipc_buf_acquire(MAX_H_SIZE);
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400170 if (!rskb)
171 return;
172 tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer);
173 tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr);
Allan Stephensa7287502011-02-28 10:03:05 -0500174 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100175}
176
177/**
Allan Stephens12099662011-04-21 19:05:25 -0500178 * disc_update - update frequency of periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179 * @req: ptr to link request structure
Allan Stephens972a77f2011-04-21 20:34:03 -0500180 *
181 * Reinitiates discovery process if discovery object has no associated nodes
182 * and is either not currently searching or is searching at a slow rate
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500184static void disc_update(struct tipc_link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100185{
Allan Stephens972a77f2011-04-21 20:34:03 -0500186 if (!req->num_nodes) {
187 if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
188 (req->timer_intv > TIPC_LINK_REQ_FAST)) {
189 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xue2f55c432015-01-09 15:27:00 +0800190 mod_timer(&req->timer, jiffies + req->timer_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100191 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100192 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900193}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100194
195/**
Allan Stephens12099662011-04-21 19:05:25 -0500196 * tipc_disc_add_dest - increment set of discovered nodes
197 * @req: ptr to link request structure
198 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500199void tipc_disc_add_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500200{
Ying Xuef9a2c802014-01-07 17:02:43 -0500201 spin_lock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500202 req->num_nodes++;
Ying Xuef9a2c802014-01-07 17:02:43 -0500203 spin_unlock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500204}
205
206/**
207 * tipc_disc_remove_dest - decrement set of discovered nodes
208 * @req: ptr to link request structure
209 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500210void tipc_disc_remove_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500211{
Ying Xuef9a2c802014-01-07 17:02:43 -0500212 spin_lock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500213 req->num_nodes--;
214 disc_update(req);
Ying Xuef9a2c802014-01-07 17:02:43 -0500215 spin_unlock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500216}
217
218/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100219 * disc_timeout - send a periodic link setup request
Ying Xue2f55c432015-01-09 15:27:00 +0800220 * @data: ptr to link request structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900221 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100222 * Called whenever a link setup request timer associated with a bearer expires.
223 */
Ying Xue2f55c432015-01-09 15:27:00 +0800224static void disc_timeout(unsigned long data)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100225{
Ying Xue2f55c432015-01-09 15:27:00 +0800226 struct tipc_link_req *req = (struct tipc_link_req *)data;
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400227 struct sk_buff *skb;
Allan Stephens972a77f2011-04-21 20:34:03 -0500228 int max_delay;
229
Ying Xuef9a2c802014-01-07 17:02:43 -0500230 spin_lock_bh(&req->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100231
Allan Stephens972a77f2011-04-21 20:34:03 -0500232 /* Stop searching if only desired node has been found */
Ying Xue7a2f7d12014-04-21 10:55:46 +0800233 if (tipc_node(req->domain) && req->num_nodes) {
Allan Stephens972a77f2011-04-21 20:34:03 -0500234 req->timer_intv = TIPC_LINK_REQ_INACTIVE;
235 goto exit;
236 }
237
238 /*
239 * Send discovery message, then update discovery timer
240 *
241 * Keep doubling time between requests until limit is reached;
242 * hold at fast polling rate if don't have any associated nodes,
243 * otherwise hold at slow polling rate
244 */
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400245 skb = skb_clone(req->buf, GFP_ATOMIC);
246 if (skb)
247 tipc_bearer_xmit_skb(req->net, req->bearer_id, skb, &req->dest);
Allan Stephens972a77f2011-04-21 20:34:03 -0500248 req->timer_intv *= 2;
249 if (req->num_nodes)
250 max_delay = TIPC_LINK_REQ_SLOW;
251 else
252 max_delay = TIPC_LINK_REQ_FAST;
253 if (req->timer_intv > max_delay)
254 req->timer_intv = max_delay;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100255
Ying Xue2f55c432015-01-09 15:27:00 +0800256 mod_timer(&req->timer, jiffies + req->timer_intv);
Allan Stephens972a77f2011-04-21 20:34:03 -0500257exit:
Ying Xuef9a2c802014-01-07 17:02:43 -0500258 spin_unlock_bh(&req->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259}
260
261/**
Allan Stephens3a777ff2011-04-21 13:58:26 -0500262 * tipc_disc_create - create object to send periodic link setup requests
Ying Xuec93d3ba2015-01-09 15:27:04 +0800263 * @net: the applicable net namespace
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500264 * @b: ptr to bearer issuing requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100265 * @dest: destination address for request messages
Allan Stephens66e019a2011-04-20 16:24:07 -0500266 * @dest_domain: network domain to which links can be established
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900267 *
Allan Stephens3a777ff2011-04-21 13:58:26 -0500268 * Returns 0 if successful, otherwise -errno.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100269 */
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500270int tipc_disc_create(struct net *net, struct tipc_bearer *b,
Ying Xuec93d3ba2015-01-09 15:27:04 +0800271 struct tipc_media_addr *dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500273 struct tipc_link_req *req;
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400274 struct sk_buff *skb;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275
Panagiotis Issaris9df3f3d2006-07-21 15:52:20 -0700276 req = kmalloc(sizeof(*req), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100277 if (!req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500278 return -ENOMEM;
Erik Hugne948fa2d12015-03-05 10:23:48 +0100279 req->buf = tipc_buf_acquire(MAX_H_SIZE);
Ying Xue22e79872014-04-25 10:44:15 +0800280 if (!req->buf) {
281 kfree(req);
Ying Xuea8b9b962014-04-21 10:55:52 +0800282 return -ENOMEM;
Ying Xue22e79872014-04-25 10:44:15 +0800283 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100284
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500285 tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286 memcpy(&req->dest, dest, sizeof(*dest));
Ying Xue7f9f95d2015-01-09 15:27:06 +0800287 req->net = net;
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500288 req->bearer_id = b->identity;
289 req->domain = b->domain;
Allan Stephens12099662011-04-21 19:05:25 -0500290 req->num_nodes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100291 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xuef9a2c802014-01-07 17:02:43 -0500292 spin_lock_init(&req->lock);
Ying Xue2f55c432015-01-09 15:27:00 +0800293 setup_timer(&req->timer, disc_timeout, (unsigned long)req);
294 mod_timer(&req->timer, jiffies + req->timer_intv);
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500295 b->link_req = req;
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400296 skb = skb_clone(req->buf, GFP_ATOMIC);
297 if (skb)
298 tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500299 return 0;
300}
301
302/**
303 * tipc_disc_delete - destroy object sending periodic link setup requests
304 * @req: ptr to link request structure
305 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500306void tipc_disc_delete(struct tipc_link_req *req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500307{
Ying Xue2f55c432015-01-09 15:27:00 +0800308 del_timer_sync(&req->timer);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400309 kfree_skb(req->buf);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500310 kfree(req);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900311}
Ying Xuea8b9b962014-04-21 10:55:52 +0800312
313/**
314 * tipc_disc_reset - reset object to send periodic link setup requests
Ying Xuec93d3ba2015-01-09 15:27:04 +0800315 * @net: the applicable net namespace
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500316 * @b: ptr to bearer issuing requests
Ying Xuea8b9b962014-04-21 10:55:52 +0800317 * @dest_domain: network domain to which links can be established
318 */
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500319void tipc_disc_reset(struct net *net, struct tipc_bearer *b)
Ying Xuea8b9b962014-04-21 10:55:52 +0800320{
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500321 struct tipc_link_req *req = b->link_req;
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400322 struct sk_buff *skb;
Ying Xuea8b9b962014-04-21 10:55:52 +0800323
324 spin_lock_bh(&req->lock);
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500325 tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800326 req->net = net;
Jon Paul Maloy1a906322015-11-19 14:30:47 -0500327 req->bearer_id = b->identity;
328 req->domain = b->domain;
Ying Xuea8b9b962014-04-21 10:55:52 +0800329 req->num_nodes = 0;
330 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xue2f55c432015-01-09 15:27:00 +0800331 mod_timer(&req->timer, jiffies + req->timer_intv);
Jon Paul Maloy60852d62015-10-22 08:51:44 -0400332 skb = skb_clone(req->buf, GFP_ATOMIC);
333 if (skb)
334 tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest);
Ying Xuea8b9b962014-04-21 10:55:52 +0800335 spin_unlock_bh(&req->lock);
336}