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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"
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
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)
Per Lidenb97bf3f2006-01-02 19:04:38 +010078 * @b_ptr: ptr to bearer issuing message
79 */
Ying Xuec93d3ba2015-01-09 15:27:04 +080080static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type,
Ying Xuea8b9b962014-04-21 10:55:52 +080081 struct tipc_bearer *b_ptr)
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;
Erik Hugne16470112014-03-28 10:32:09 +010085 u32 dest_domain = b_ptr->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 Maloy7764d6e2015-03-13 16:08:05 -040092 msg_set_node_capabilities(msg, 0);
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 Maloy38504c22014-05-14 05:39:13 -040095 b_ptr->media->addr2msg(msg_media_addr(msg), &b_ptr->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
100 * @b_ptr: pointer to bearer detecting duplication
101 * @node_addr: duplicated node address
102 * @media_addr: media address advertised by duplicated node
103 */
Allan Stephens2d627b92011-01-07 13:00:11 -0500104static void disc_dupl_alert(struct tipc_bearer *b_ptr, 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,
114 media_addr_str, b_ptr->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 */
Ying Xuec93d3ba2015-01-09 15:27:04 +0800123void tipc_disc_rcv(struct net *net, struct sk_buff *buf,
124 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_node *node;
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500128 struct tipc_link *link;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400129 struct tipc_media_addr maddr;
Allan Stephensa7287502011-02-28 10:03:05 -0500130 struct sk_buff *rbuf;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100131 struct tipc_msg *msg = buf_msg(buf);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400132 u32 ddom = msg_dest_domain(msg);
133 u32 onode = msg_prevnode(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134 u32 net_id = msg_bc_netid(msg);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400135 u32 mtyp = msg_type(msg);
Allan Stephensfc0eea62011-10-28 16:26:41 -0400136 u32 signature = msg_node_sig(msg);
Jon Paul Maloy7764d6e2015-03-13 16:08:05 -0400137 u16 caps = msg_node_capabilities(msg);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400138 bool addr_match = false;
139 bool sign_match = false;
140 bool link_up = false;
141 bool accept_addr = false;
142 bool accept_sign = false;
143 bool respond = false;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100144
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400145 bearer->media->msg2addr(bearer, &maddr, msg_media_addr(msg));
Allan Stephens5f6d9122011-11-04 13:24:29 -0400146 kfree_skb(buf);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100147
Allan Stephens97878a42011-10-28 17:30:08 -0400148 /* Ensure message from node is valid and communication is permitted */
Ying Xuec93d3ba2015-01-09 15:27:04 +0800149 if (net_id != tn->net_id)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400151 if (maddr.broadcast)
Allan Stephensd6d45772011-10-07 15:48:41 -0400152 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400153 if (!tipc_addr_domain_valid(ddom))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100154 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400155 if (!tipc_addr_node_valid(onode))
Allan Stephensa7287502011-02-28 10:03:05 -0500156 return;
Allan Stephens2de07f62006-10-16 21:57:13 -0700157
Ying Xue34747532015-01-09 15:27:10 +0800158 if (in_own_node(net, onode)) {
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400159 if (memcmp(&maddr, &bearer->addr, sizeof(maddr)))
Ying Xue34747532015-01-09 15:27:10 +0800160 disc_dupl_alert(bearer, tn->own_addr, &maddr);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400161 return;
Allan Stephensa7287502011-02-28 10:03:05 -0500162 }
Ying Xue34747532015-01-09 15:27:10 +0800163 if (!tipc_in_scope(ddom, tn->own_addr))
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400164 return;
165 if (!tipc_in_scope(bearer->domain, onode))
166 return;
167
Jon Paul Maloyb45db712015-02-03 08:59:19 -0500168 node = tipc_node_create(net, onode);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400169 if (!node)
170 return;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400171 tipc_node_lock(node);
Jon Paul Maloy7764d6e2015-03-13 16:08:05 -0400172 node->capabilities = caps;
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400173 link = node->links[bearer->identity];
Allan Stephens5a68d5e2010-08-17 11:00:16 +0000174
Allan Stephens97878a42011-10-28 17:30:08 -0400175 /* Prepare to validate requesting node's signature and media address */
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400176 sign_match = (signature == node->signature);
177 addr_match = link && !memcmp(&link->media_addr, &maddr, sizeof(maddr));
178 link_up = link && tipc_link_is_up(link);
Allan Stephensa7287502011-02-28 10:03:05 -0500179
Allan Stephens97878a42011-10-28 17:30:08 -0400180
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400181 /* These three flags give us eight permutations: */
182
183 if (sign_match && addr_match && link_up) {
184 /* All is fine. Do nothing. */
185 } else if (sign_match && addr_match && !link_up) {
186 /* Respond. The link will come up in due time */
187 respond = true;
188 } else if (sign_match && !addr_match && link_up) {
189 /* Peer has changed i/f address without rebooting.
190 * If so, the link will reset soon, and the next
191 * discovery will be accepted. So we can ignore it.
192 * It may also be an cloned or malicious peer having
193 * chosen the same node address and signature as an
194 * existing one.
195 * Ignore requests until the link goes down, if ever.
196 */
197 disc_dupl_alert(bearer, onode, &maddr);
198 } else if (sign_match && !addr_match && !link_up) {
199 /* Peer link has changed i/f address without rebooting.
200 * It may also be a cloned or malicious peer; we can't
201 * distinguish between the two.
202 * The signature is correct, so we must accept.
203 */
204 accept_addr = true;
205 respond = true;
206 } else if (!sign_match && addr_match && link_up) {
207 /* Peer node rebooted. Two possibilities:
208 * - Delayed re-discovery; this link endpoint has already
209 * reset and re-established contact with the peer, before
210 * receiving a discovery message from that node.
211 * (The peer happened to receive one from this node first).
212 * - The peer came back so fast that our side has not
213 * discovered it yet. Probing from this side will soon
214 * reset the link, since there can be no working link
215 * endpoint at the peer end, and the link will re-establish.
216 * Accept the signature, since it comes from a known peer.
217 */
218 accept_sign = true;
219 } else if (!sign_match && addr_match && !link_up) {
220 /* The peer node has rebooted.
221 * Accept signature, since it is a known peer.
222 */
223 accept_sign = true;
224 respond = true;
225 } else if (!sign_match && !addr_match && link_up) {
226 /* Peer rebooted with new address, or a new/duplicate peer.
227 * Ignore until the link goes down, if ever.
228 */
229 disc_dupl_alert(bearer, onode, &maddr);
230 } else if (!sign_match && !addr_match && !link_up) {
231 /* Peer rebooted with new address, or it is a new peer.
232 * Accept signature and address.
233 */
234 accept_sign = true;
235 accept_addr = true;
236 respond = true;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100237 }
Allan Stephensa7287502011-02-28 10:03:05 -0500238
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400239 if (accept_sign)
240 node->signature = signature;
241
242 if (accept_addr) {
243 if (!link)
244 link = tipc_link_create(node, bearer, &maddr);
245 if (link) {
246 memcpy(&link->media_addr, &maddr, sizeof(maddr));
Allan Stephens97878a42011-10-28 17:30:08 -0400247 tipc_link_reset(link);
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400248 } else {
249 respond = false;
Allan Stephensa7287502011-02-28 10:03:05 -0500250 }
Allan Stephens97878a42011-10-28 17:30:08 -0400251 }
252
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400253 /* Send response, if necessary */
254 if (respond && (mtyp == DSC_REQ_MSG)) {
Erik Hugne948fa2d12015-03-05 10:23:48 +0100255 rbuf = tipc_buf_acquire(MAX_H_SIZE);
Allan Stephensfa2bae22011-02-28 10:56:23 -0500256 if (rbuf) {
Ying Xuec93d3ba2015-01-09 15:27:04 +0800257 tipc_disc_init_msg(net, rbuf, DSC_RESP_MSG, bearer);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800258 tipc_bearer_send(net, bearer->identity, rbuf, &maddr);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400259 kfree_skb(rbuf);
Allan Stephensfa2bae22011-02-28 10:56:23 -0500260 }
Allan Stephensa7287502011-02-28 10:03:05 -0500261 }
Jon Paul Maloyc82910e2014-05-14 05:39:14 -0400262 tipc_node_unlock(node);
Ying Xue8a0f6eb2015-03-26 18:10:24 +0800263 tipc_node_put(node);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100264}
265
266/**
Allan Stephens12099662011-04-21 19:05:25 -0500267 * disc_update - update frequency of periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100268 * @req: ptr to link request structure
Allan Stephens972a77f2011-04-21 20:34:03 -0500269 *
270 * Reinitiates discovery process if discovery object has no associated nodes
271 * and is either not currently searching or is searching at a slow rate
Per Lidenb97bf3f2006-01-02 19:04:38 +0100272 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500273static void disc_update(struct tipc_link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100274{
Allan Stephens972a77f2011-04-21 20:34:03 -0500275 if (!req->num_nodes) {
276 if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
277 (req->timer_intv > TIPC_LINK_REQ_FAST)) {
278 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xue2f55c432015-01-09 15:27:00 +0800279 mod_timer(&req->timer, jiffies + req->timer_intv);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100280 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100281 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900282}
Per Lidenb97bf3f2006-01-02 19:04:38 +0100283
284/**
Allan Stephens12099662011-04-21 19:05:25 -0500285 * tipc_disc_add_dest - increment set of discovered nodes
286 * @req: ptr to link request structure
287 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500288void tipc_disc_add_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500289{
Ying Xuef9a2c802014-01-07 17:02:43 -0500290 spin_lock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500291 req->num_nodes++;
Ying Xuef9a2c802014-01-07 17:02:43 -0500292 spin_unlock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500293}
294
295/**
296 * tipc_disc_remove_dest - decrement set of discovered nodes
297 * @req: ptr to link request structure
298 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500299void tipc_disc_remove_dest(struct tipc_link_req *req)
Allan Stephens12099662011-04-21 19:05:25 -0500300{
Ying Xuef9a2c802014-01-07 17:02:43 -0500301 spin_lock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500302 req->num_nodes--;
303 disc_update(req);
Ying Xuef9a2c802014-01-07 17:02:43 -0500304 spin_unlock_bh(&req->lock);
Allan Stephens12099662011-04-21 19:05:25 -0500305}
306
307/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100308 * disc_timeout - send a periodic link setup request
Ying Xue2f55c432015-01-09 15:27:00 +0800309 * @data: ptr to link request structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900310 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100311 * Called whenever a link setup request timer associated with a bearer expires.
312 */
Ying Xue2f55c432015-01-09 15:27:00 +0800313static void disc_timeout(unsigned long data)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100314{
Ying Xue2f55c432015-01-09 15:27:00 +0800315 struct tipc_link_req *req = (struct tipc_link_req *)data;
Allan Stephens972a77f2011-04-21 20:34:03 -0500316 int max_delay;
317
Ying Xuef9a2c802014-01-07 17:02:43 -0500318 spin_lock_bh(&req->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100319
Allan Stephens972a77f2011-04-21 20:34:03 -0500320 /* Stop searching if only desired node has been found */
Ying Xue7a2f7d12014-04-21 10:55:46 +0800321 if (tipc_node(req->domain) && req->num_nodes) {
Allan Stephens972a77f2011-04-21 20:34:03 -0500322 req->timer_intv = TIPC_LINK_REQ_INACTIVE;
323 goto exit;
324 }
325
326 /*
327 * Send discovery message, then update discovery timer
328 *
329 * Keep doubling time between requests until limit is reached;
330 * hold at fast polling rate if don't have any associated nodes,
331 * otherwise hold at slow polling rate
332 */
Ying Xue7f9f95d2015-01-09 15:27:06 +0800333 tipc_bearer_send(req->net, req->bearer_id, req->buf, &req->dest);
Erik Hugne512137e2013-12-06 10:08:00 -0500334
Per Lidenb97bf3f2006-01-02 19:04:38 +0100335
Allan Stephens972a77f2011-04-21 20:34:03 -0500336 req->timer_intv *= 2;
337 if (req->num_nodes)
338 max_delay = TIPC_LINK_REQ_SLOW;
339 else
340 max_delay = TIPC_LINK_REQ_FAST;
341 if (req->timer_intv > max_delay)
342 req->timer_intv = max_delay;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100343
Ying Xue2f55c432015-01-09 15:27:00 +0800344 mod_timer(&req->timer, jiffies + req->timer_intv);
Allan Stephens972a77f2011-04-21 20:34:03 -0500345exit:
Ying Xuef9a2c802014-01-07 17:02:43 -0500346 spin_unlock_bh(&req->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100347}
348
349/**
Allan Stephens3a777ff2011-04-21 13:58:26 -0500350 * tipc_disc_create - create object to send periodic link setup requests
Ying Xuec93d3ba2015-01-09 15:27:04 +0800351 * @net: the applicable net namespace
Per Lidenb97bf3f2006-01-02 19:04:38 +0100352 * @b_ptr: ptr to bearer issuing requests
353 * @dest: destination address for request messages
Allan Stephens66e019a2011-04-20 16:24:07 -0500354 * @dest_domain: network domain to which links can be established
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900355 *
Allan Stephens3a777ff2011-04-21 13:58:26 -0500356 * Returns 0 if successful, otherwise -errno.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357 */
Ying Xuec93d3ba2015-01-09 15:27:04 +0800358int tipc_disc_create(struct net *net, struct tipc_bearer *b_ptr,
359 struct tipc_media_addr *dest)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100360{
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500361 struct tipc_link_req *req;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100362
Panagiotis Issaris9df3f3d2006-07-21 15:52:20 -0700363 req = kmalloc(sizeof(*req), GFP_ATOMIC);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364 if (!req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500365 return -ENOMEM;
Erik Hugne948fa2d12015-03-05 10:23:48 +0100366 req->buf = tipc_buf_acquire(MAX_H_SIZE);
Ying Xue22e79872014-04-25 10:44:15 +0800367 if (!req->buf) {
368 kfree(req);
Ying Xuea8b9b962014-04-21 10:55:52 +0800369 return -ENOMEM;
Ying Xue22e79872014-04-25 10:44:15 +0800370 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100371
Ying Xuec93d3ba2015-01-09 15:27:04 +0800372 tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100373 memcpy(&req->dest, dest, sizeof(*dest));
Ying Xue7f9f95d2015-01-09 15:27:06 +0800374 req->net = net;
Ying Xue7a2f7d12014-04-21 10:55:46 +0800375 req->bearer_id = b_ptr->identity;
376 req->domain = b_ptr->domain;
Allan Stephens12099662011-04-21 19:05:25 -0500377 req->num_nodes = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100378 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xuef9a2c802014-01-07 17:02:43 -0500379 spin_lock_init(&req->lock);
Ying Xue2f55c432015-01-09 15:27:00 +0800380 setup_timer(&req->timer, disc_timeout, (unsigned long)req);
381 mod_timer(&req->timer, jiffies + req->timer_intv);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500382 b_ptr->link_req = req;
Ying Xue7f9f95d2015-01-09 15:27:06 +0800383 tipc_bearer_send(net, req->bearer_id, req->buf, &req->dest);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500384 return 0;
385}
386
387/**
388 * tipc_disc_delete - destroy object sending periodic link setup requests
389 * @req: ptr to link request structure
390 */
Paul Gortmakera18c4bc2011-12-29 20:58:42 -0500391void tipc_disc_delete(struct tipc_link_req *req)
Allan Stephens3a777ff2011-04-21 13:58:26 -0500392{
Ying Xue2f55c432015-01-09 15:27:00 +0800393 del_timer_sync(&req->timer);
Allan Stephens5f6d9122011-11-04 13:24:29 -0400394 kfree_skb(req->buf);
Allan Stephens3a777ff2011-04-21 13:58:26 -0500395 kfree(req);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900396}
Ying Xuea8b9b962014-04-21 10:55:52 +0800397
398/**
399 * tipc_disc_reset - reset object to send periodic link setup requests
Ying Xuec93d3ba2015-01-09 15:27:04 +0800400 * @net: the applicable net namespace
Ying Xuea8b9b962014-04-21 10:55:52 +0800401 * @b_ptr: ptr to bearer issuing requests
402 * @dest_domain: network domain to which links can be established
403 */
Ying Xuec93d3ba2015-01-09 15:27:04 +0800404void tipc_disc_reset(struct net *net, struct tipc_bearer *b_ptr)
Ying Xuea8b9b962014-04-21 10:55:52 +0800405{
406 struct tipc_link_req *req = b_ptr->link_req;
407
408 spin_lock_bh(&req->lock);
Ying Xuec93d3ba2015-01-09 15:27:04 +0800409 tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b_ptr);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800410 req->net = net;
Ying Xuea8b9b962014-04-21 10:55:52 +0800411 req->bearer_id = b_ptr->identity;
412 req->domain = b_ptr->domain;
413 req->num_nodes = 0;
414 req->timer_intv = TIPC_LINK_REQ_INIT;
Ying Xue2f55c432015-01-09 15:27:00 +0800415 mod_timer(&req->timer, jiffies + req->timer_intv);
Ying Xue7f9f95d2015-01-09 15:27:06 +0800416 tipc_bearer_send(net, req->bearer_id, req->buf, &req->dest);
Ying Xuea8b9b962014-04-21 10:55:52 +0800417 spin_unlock_bh(&req->lock);
418}