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1/*
2 * net/tipc/discover.c
3 *
4 * Copyright (c) 2003-2005, Ericsson Research Canada
5 * Copyright (c) 2005, Wind River Systems
6 * Copyright (c) 2005-2006, Ericsson AB
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * Redistributions of source code must retain the above copyright notice, this
13 * list of conditions and the following disclaimer.
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "core.h"
35#include "dbg.h"
36#include "link.h"
37#include "zone.h"
38#include "discover.h"
39#include "port.h"
40#include "name_table.h"
41
42#define TIPC_LINK_REQ_INIT 125 /* min delay during bearer start up */
43#define TIPC_LINK_REQ_FAST 2000 /* normal delay if bearer has no links */
44#define TIPC_LINK_REQ_SLOW 600000 /* normal delay if bearer has links */
45
46#if 0
47#define GET_NODE_INFO 300
48#define GET_NODE_INFO_RESULT 301
49#define FORWARD_LINK_PROBE 302
50#define LINK_REQUEST_REJECTED 303
51#define LINK_REQUEST_ACCEPTED 304
52#define DROP_LINK_REQUEST 305
53#define CHECK_LINK_COUNT 306
54#endif
55
56/*
57 * TODO: Most of the inter-cluster setup stuff should be
58 * rewritten, and be made conformant with specification.
59 */
60
61
62/**
63 * struct link_req - information about an ongoing link setup request
64 * @bearer: bearer issuing requests
65 * @dest: destination address for request messages
66 * @buf: request message to be (repeatedly) sent
67 * @timer: timer governing period between requests
68 * @timer_intv: current interval between requests (in ms)
69 */
70struct link_req {
71 struct bearer *bearer;
72 struct tipc_media_addr dest;
73 struct sk_buff *buf;
74 struct timer_list timer;
75 unsigned int timer_intv;
76};
77
78
79#if 0
80int disc_create_link(const struct tipc_link_create *argv)
81{
82 /*
83 * Code for inter cluster link setup here
84 */
85 return TIPC_OK;
86}
87#endif
88
89/*
90 * disc_lost_link(): A link has lost contact
91 */
92
93void disc_link_event(u32 addr, char *name, int up)
94{
95 if (in_own_cluster(addr))
96 return;
97 /*
98 * Code for inter cluster link setup here
99 */
100}
101
102/**
103 * disc_init_msg - initialize a link setup message
104 * @type: message type (request or response)
105 * @req_links: number of links associated with message
106 * @dest_domain: network domain of node(s) which should respond to message
107 * @b_ptr: ptr to bearer issuing message
108 */
109
110struct sk_buff *disc_init_msg(u32 type,
111 u32 req_links,
112 u32 dest_domain,
113 struct bearer *b_ptr)
114{
115 struct sk_buff *buf = buf_acquire(DSC_H_SIZE);
116 struct tipc_msg *msg;
117
118 if (buf) {
119 msg = buf_msg(buf);
120 msg_init(msg, LINK_CONFIG, type, TIPC_OK, DSC_H_SIZE,
121 dest_domain);
122 msg_set_non_seq(msg);
123 msg_set_req_links(msg, req_links);
124 msg_set_dest_domain(msg, dest_domain);
125 msg_set_bc_netid(msg, tipc_net_id);
126 msg_set_media_addr(msg, &b_ptr->publ.addr);
127 }
128 return buf;
129}
130
131/**
132 * disc_recv_msg - handle incoming link setup message (request or response)
133 * @buf: buffer containing message
134 */
135
136void disc_recv_msg(struct sk_buff *buf)
137{
138 struct bearer *b_ptr = (struct bearer *)TIPC_SKB_CB(buf)->handle;
139 struct link *link;
140 struct tipc_media_addr media_addr;
141 struct tipc_msg *msg = buf_msg(buf);
142 u32 dest = msg_dest_domain(msg);
143 u32 orig = msg_prevnode(msg);
144 u32 net_id = msg_bc_netid(msg);
145 u32 type = msg_type(msg);
146
147 msg_get_media_addr(msg,&media_addr);
148 msg_dbg(msg, "RECV:");
149 buf_discard(buf);
150
151 if (net_id != tipc_net_id)
152 return;
153 if (!addr_domain_valid(dest))
154 return;
155 if (!addr_node_valid(orig))
156 return;
157 if (orig == tipc_own_addr)
158 return;
159 if (!in_scope(dest, tipc_own_addr))
160 return;
161 if (is_slave(tipc_own_addr) && is_slave(orig))
162 return;
163 if (is_slave(orig) && !in_own_cluster(orig))
164 return;
165 if (in_own_cluster(orig)) {
166 /* Always accept link here */
167 struct sk_buff *rbuf;
168 struct tipc_media_addr *addr;
169 struct node *n_ptr = node_find(orig);
170 int link_up;
171 dbg(" in own cluster\n");
172 if (n_ptr == NULL) {
173 n_ptr = node_create(orig);
174 }
175 if (n_ptr == NULL) {
176 warn("Memory squeeze; Failed to create node\n");
177 return;
178 }
179 spin_lock_bh(&n_ptr->lock);
180 link = n_ptr->links[b_ptr->identity];
181 if (!link) {
182 dbg("creating link\n");
183 link = link_create(b_ptr, orig, &media_addr);
184 if (!link) {
185 spin_unlock_bh(&n_ptr->lock);
186 return;
187 }
188 }
189 addr = &link->media_addr;
190 if (memcmp(addr, &media_addr, sizeof(*addr))) {
191 char addr_string[16];
192
193 warn("New bearer address for %s\n",
194 addr_string_fill(addr_string, orig));
195 memcpy(addr, &media_addr, sizeof(*addr));
196 link_reset(link);
197 }
198 link_up = link_is_up(link);
199 spin_unlock_bh(&n_ptr->lock);
200 if ((type == DSC_RESP_MSG) || link_up)
201 return;
202 rbuf = disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
203 if (rbuf != NULL) {
204 msg_dbg(buf_msg(rbuf),"SEND:");
205 b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
206 buf_discard(rbuf);
207 }
208 }
209}
210
211/**
212 * disc_stop_link_req - stop sending periodic link setup requests
213 * @req: ptr to link request structure
214 */
215
216void disc_stop_link_req(struct link_req *req)
217{
218 if (!req)
219 return;
220
221 k_cancel_timer(&req->timer);
222 k_term_timer(&req->timer);
223 buf_discard(req->buf);
224 kfree(req);
225}
226
227/**
228 * disc_update_link_req - update frequency of periodic link setup requests
229 * @req: ptr to link request structure
230 */
231
232void disc_update_link_req(struct link_req *req)
233{
234 if (!req)
235 return;
236
237 if (req->timer_intv == TIPC_LINK_REQ_SLOW) {
238 if (!req->bearer->nodes.count) {
239 req->timer_intv = TIPC_LINK_REQ_FAST;
240 k_start_timer(&req->timer, req->timer_intv);
241 }
242 } else if (req->timer_intv == TIPC_LINK_REQ_FAST) {
243 if (req->bearer->nodes.count) {
244 req->timer_intv = TIPC_LINK_REQ_SLOW;
245 k_start_timer(&req->timer, req->timer_intv);
246 }
247 } else {
248 /* leave timer "as is" if haven't yet reached a "normal" rate */
249 }
250}
251
252/**
253 * disc_timeout - send a periodic link setup request
254 * @req: ptr to link request structure
255 *
256 * Called whenever a link setup request timer associated with a bearer expires.
257 */
258
259static void disc_timeout(struct link_req *req)
260{
261 struct tipc_msg *msg = buf_msg(req->buf);
262
263 spin_lock_bh(&req->bearer->publ.lock);
264
265#if 0
266 /* CURRENTLY DON'T SUPPORT INTER-ZONE LINKS */
267 u32 dest_domain = msg_dest_domain(msg);
268 int stop = 0;
269 if (!in_scope(dest_domain, tipc_own_addr)) {
270 struct _zone *z_ptr = zone_find(dest_domain);
271
272 if (z_ptr && (z_ptr->links >= msg_req_links(msg)))
273 stop = 1;
274 if (req->timer_intv >= 32000)
275 stop = 1;
276 }
277 if (stop) {
278 k_cancel_timer(&req->timer);
279 buf_discard(req->buf);
280 kfree(req);
281 spin_unlock_bh(&req->bearer->publ.lock);
282 return;
283 }
284#endif
285
286 msg_dbg(msg,"SEND:");
287 req->bearer->media->send_msg(req->buf, &req->bearer->publ, &req->dest);
288
289 if ((req->timer_intv == TIPC_LINK_REQ_SLOW) ||
290 (req->timer_intv == TIPC_LINK_REQ_FAST)) {
291 /* leave timer interval "as is" if already at a "normal" rate */
292 } else {
293 req->timer_intv *= 2;
294 if (req->timer_intv > TIPC_LINK_REQ_FAST)
295 req->timer_intv = TIPC_LINK_REQ_FAST;
296 if ((req->timer_intv == TIPC_LINK_REQ_FAST) &&
297 (req->bearer->nodes.count))
298 req->timer_intv = TIPC_LINK_REQ_SLOW;
299 }
300 k_start_timer(&req->timer, req->timer_intv);
301
302 spin_unlock_bh(&req->bearer->publ.lock);
303}
304
305/**
306 * disc_init_link_req - start sending periodic link setup requests
307 * @b_ptr: ptr to bearer issuing requests
308 * @dest: destination address for request messages
309 * @dest_domain: network domain of node(s) which should respond to message
310 * @req_links: max number of desired links
311 *
312 * Returns pointer to link request structure, or NULL if unable to create.
313 */
314
315struct link_req *disc_init_link_req(struct bearer *b_ptr,
316 const struct tipc_media_addr *dest,
317 u32 dest_domain,
318 u32 req_links)
319{
320 struct link_req *req;
321
322 req = (struct link_req *)kmalloc(sizeof(*req), GFP_ATOMIC);
323 if (!req)
324 return NULL;
325
326 req->buf = disc_init_msg(DSC_REQ_MSG, req_links, dest_domain, b_ptr);
327 if (!req->buf) {
328 kfree(req);
329 return NULL;
330 }
331
332 memcpy(&req->dest, dest, sizeof(*dest));
333 req->bearer = b_ptr;
334 req->timer_intv = TIPC_LINK_REQ_INIT;
335 k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
336 k_start_timer(&req->timer, req->timer_intv);
337 return req;
338}
339
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