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Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/discover.c
3 *
Per Liden9da1c8b2006-01-11 18:40:41 +01004 * Copyright (c) 2003-2006, Ericsson AB
Per Lidenb97bf3f2006-01-02 19:04:38 +01005 * Copyright (c) 2005, 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"
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
49#if 0
50#define GET_NODE_INFO 300
51#define GET_NODE_INFO_RESULT 301
52#define FORWARD_LINK_PROBE 302
53#define LINK_REQUEST_REJECTED 303
54#define LINK_REQUEST_ACCEPTED 304
55#define DROP_LINK_REQUEST 305
56#define CHECK_LINK_COUNT 306
57#endif
58
59/*
60 * TODO: Most of the inter-cluster setup stuff should be
61 * rewritten, and be made conformant with specification.
62 */
63
64
65/**
66 * struct link_req - information about an ongoing link setup request
67 * @bearer: bearer issuing requests
68 * @dest: destination address for request messages
69 * @buf: request message to be (repeatedly) sent
70 * @timer: timer governing period between requests
71 * @timer_intv: current interval between requests (in ms)
72 */
73struct link_req {
74 struct bearer *bearer;
75 struct tipc_media_addr dest;
76 struct sk_buff *buf;
77 struct timer_list timer;
78 unsigned int timer_intv;
79};
80
81
82#if 0
83int disc_create_link(const struct tipc_link_create *argv)
84{
85 /*
86 * Code for inter cluster link setup here
87 */
88 return TIPC_OK;
89}
90#endif
91
92/*
93 * disc_lost_link(): A link has lost contact
94 */
95
Per Liden4323add2006-01-18 00:38:21 +010096void tipc_disc_link_event(u32 addr, char *name, int up)
Per Lidenb97bf3f2006-01-02 19:04:38 +010097{
98 if (in_own_cluster(addr))
99 return;
100 /*
101 * Code for inter cluster link setup here
102 */
103}
104
105/**
Per Liden4323add2006-01-18 00:38:21 +0100106 * tipc_disc_init_msg - initialize a link setup message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100107 * @type: message type (request or response)
108 * @req_links: number of links associated with message
109 * @dest_domain: network domain of node(s) which should respond to message
110 * @b_ptr: ptr to bearer issuing message
111 */
112
Adrian Bunk988f0882006-03-20 22:37:52 -0800113static struct sk_buff *tipc_disc_init_msg(u32 type,
114 u32 req_links,
115 u32 dest_domain,
116 struct bearer *b_ptr)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100117{
118 struct sk_buff *buf = buf_acquire(DSC_H_SIZE);
119 struct tipc_msg *msg;
120
121 if (buf) {
122 msg = buf_msg(buf);
123 msg_init(msg, LINK_CONFIG, type, TIPC_OK, DSC_H_SIZE,
124 dest_domain);
125 msg_set_non_seq(msg);
126 msg_set_req_links(msg, req_links);
127 msg_set_dest_domain(msg, dest_domain);
128 msg_set_bc_netid(msg, tipc_net_id);
129 msg_set_media_addr(msg, &b_ptr->publ.addr);
130 }
131 return buf;
132}
133
134/**
Per Liden4323add2006-01-18 00:38:21 +0100135 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100136 * @buf: buffer containing message
137 */
138
Per Liden4323add2006-01-18 00:38:21 +0100139void tipc_disc_recv_msg(struct sk_buff *buf)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100140{
141 struct bearer *b_ptr = (struct bearer *)TIPC_SKB_CB(buf)->handle;
142 struct link *link;
143 struct tipc_media_addr media_addr;
144 struct tipc_msg *msg = buf_msg(buf);
145 u32 dest = msg_dest_domain(msg);
146 u32 orig = msg_prevnode(msg);
147 u32 net_id = msg_bc_netid(msg);
148 u32 type = msg_type(msg);
149
150 msg_get_media_addr(msg,&media_addr);
151 msg_dbg(msg, "RECV:");
152 buf_discard(buf);
153
154 if (net_id != tipc_net_id)
155 return;
Per Liden4323add2006-01-18 00:38:21 +0100156 if (!tipc_addr_domain_valid(dest))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100157 return;
Per Liden4323add2006-01-18 00:38:21 +0100158 if (!tipc_addr_node_valid(orig))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100159 return;
160 if (orig == tipc_own_addr)
161 return;
162 if (!in_scope(dest, tipc_own_addr))
163 return;
164 if (is_slave(tipc_own_addr) && is_slave(orig))
165 return;
166 if (is_slave(orig) && !in_own_cluster(orig))
167 return;
168 if (in_own_cluster(orig)) {
169 /* Always accept link here */
170 struct sk_buff *rbuf;
171 struct tipc_media_addr *addr;
Per Liden4323add2006-01-18 00:38:21 +0100172 struct node *n_ptr = tipc_node_find(orig);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100173 int link_up;
174 dbg(" in own cluster\n");
175 if (n_ptr == NULL) {
Per Liden4323add2006-01-18 00:38:21 +0100176 n_ptr = tipc_node_create(orig);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100177 }
178 if (n_ptr == NULL) {
179 warn("Memory squeeze; Failed to create node\n");
180 return;
181 }
182 spin_lock_bh(&n_ptr->lock);
183 link = n_ptr->links[b_ptr->identity];
184 if (!link) {
185 dbg("creating link\n");
Per Liden4323add2006-01-18 00:38:21 +0100186 link = tipc_link_create(b_ptr, orig, &media_addr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100187 if (!link) {
188 spin_unlock_bh(&n_ptr->lock);
189 return;
190 }
191 }
192 addr = &link->media_addr;
193 if (memcmp(addr, &media_addr, sizeof(*addr))) {
194 char addr_string[16];
195
196 warn("New bearer address for %s\n",
197 addr_string_fill(addr_string, orig));
198 memcpy(addr, &media_addr, sizeof(*addr));
Per Liden4323add2006-01-18 00:38:21 +0100199 tipc_link_reset(link);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100200 }
Per Liden4323add2006-01-18 00:38:21 +0100201 link_up = tipc_link_is_up(link);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 spin_unlock_bh(&n_ptr->lock);
203 if ((type == DSC_RESP_MSG) || link_up)
204 return;
Per Liden4323add2006-01-18 00:38:21 +0100205 rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100206 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/**
Per Liden4323add2006-01-18 00:38:21 +0100215 * tipc_disc_stop_link_req - stop sending periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100216 * @req: ptr to link request structure
217 */
218
Per Liden4323add2006-01-18 00:38:21 +0100219void tipc_disc_stop_link_req(struct link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100220{
221 if (!req)
222 return;
223
224 k_cancel_timer(&req->timer);
225 k_term_timer(&req->timer);
226 buf_discard(req->buf);
227 kfree(req);
228}
229
230/**
Per Liden4323add2006-01-18 00:38:21 +0100231 * tipc_disc_update_link_req - update frequency of periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100232 * @req: ptr to link request structure
233 */
234
Per Liden4323add2006-01-18 00:38:21 +0100235void tipc_disc_update_link_req(struct link_req *req)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236{
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 }
253}
254
255/**
256 * disc_timeout - send a periodic link setup request
257 * @req: ptr to link request structure
258 *
259 * Called whenever a link setup request timer associated with a bearer expires.
260 */
261
262static void disc_timeout(struct link_req *req)
263{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100264 spin_lock_bh(&req->bearer->publ.lock);
265
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266 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;
Jon Maloyb70e4f42006-01-10 18:54:24 +0000273 if (req->timer_intv > TIPC_LINK_REQ_SLOW)
274 req->timer_intv = TIPC_LINK_REQ_SLOW;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100275 if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
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/**
Per Liden4323add2006-01-18 00:38:21 +0100285 * tipc_disc_init_link_req - start sending periodic link setup requests
Per Lidenb97bf3f2006-01-02 19:04:38 +0100286 * @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
290 *
291 * Returns pointer to link request structure, or NULL if unable to create.
292 */
293
Per Liden4323add2006-01-18 00:38:21 +0100294struct link_req *tipc_disc_init_link_req(struct bearer *b_ptr,
295 const struct tipc_media_addr *dest,
296 u32 dest_domain,
297 u32 req_links)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100298{
299 struct link_req *req;
300
301 req = (struct link_req *)kmalloc(sizeof(*req), GFP_ATOMIC);
302 if (!req)
303 return NULL;
304
Per Liden4323add2006-01-18 00:38:21 +0100305 req->buf = tipc_disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100306 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;
317}
318