4 * Copyright (c) 2003-2006, Ericsson AB
5 * Copyright (c) 2005-2006, Wind River Systems
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9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
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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.
20 * 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.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 * POSSIBILITY OF SUCH DAMAGE.
43 #include "name_table.h"
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 */
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
60 * TODO: Most of the inter-cluster setup stuff should be
61 * rewritten, and be made conformant with specification.
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)
74 struct bearer
*bearer
;
75 struct tipc_media_addr dest
;
77 struct timer_list timer
;
78 unsigned int timer_intv
;
83 int disc_create_link(const struct tipc_link_create
*argv
)
86 * Code for inter cluster link setup here
93 * disc_lost_link(): A link has lost contact
96 void tipc_disc_link_event(u32 addr
, char *name
, int up
)
98 if (in_own_cluster(addr
))
101 * Code for inter cluster link setup here
106 * tipc_disc_init_msg - initialize a link setup message
107 * @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
113 static struct sk_buff
*tipc_disc_init_msg(u32 type
,
116 struct bearer
*b_ptr
)
118 struct sk_buff
*buf
= buf_acquire(DSC_H_SIZE
);
119 struct tipc_msg
*msg
;
123 msg_init(msg
, LINK_CONFIG
, type
, TIPC_OK
, DSC_H_SIZE
,
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
);
135 * disc_dupl_alert - issue node address duplication alert
136 * @b_ptr: pointer to bearer detecting duplication
137 * @node_addr: duplicated node address
138 * @media_addr: media address advertised by duplicated node
141 static void disc_dupl_alert(struct bearer
*b_ptr
, u32 node_addr
,
142 struct tipc_media_addr
*media_addr
)
144 char node_addr_str
[16];
145 char media_addr_str
[64];
148 addr_string_fill(node_addr_str
, node_addr
);
149 tipc_printbuf_init(&pb
, media_addr_str
, sizeof(media_addr_str
));
150 tipc_media_addr_printf(&pb
, media_addr
);
151 tipc_printbuf_validate(&pb
);
152 warn("Duplicate %s using %s seen on <%s>\n",
153 node_addr_str
, media_addr_str
, b_ptr
->publ
.name
);
157 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
158 * @buf: buffer containing message
159 * @b_ptr: bearer that message arrived on
162 void tipc_disc_recv_msg(struct sk_buff
*buf
, struct bearer
*b_ptr
)
165 struct tipc_media_addr media_addr
;
166 struct tipc_msg
*msg
= buf_msg(buf
);
167 u32 dest
= msg_dest_domain(msg
);
168 u32 orig
= msg_prevnode(msg
);
169 u32 net_id
= msg_bc_netid(msg
);
170 u32 type
= msg_type(msg
);
172 msg_get_media_addr(msg
,&media_addr
);
173 msg_dbg(msg
, "RECV:");
176 if (net_id
!= tipc_net_id
)
178 if (!tipc_addr_domain_valid(dest
))
180 if (!tipc_addr_node_valid(orig
))
182 if (orig
== tipc_own_addr
) {
183 if (memcmp(&media_addr
, &b_ptr
->publ
.addr
, sizeof(media_addr
)))
184 disc_dupl_alert(b_ptr
, tipc_own_addr
, &media_addr
);
187 if (!in_scope(dest
, tipc_own_addr
))
189 if (is_slave(tipc_own_addr
) && is_slave(orig
))
191 if (is_slave(orig
) && !in_own_cluster(orig
))
193 if (in_own_cluster(orig
)) {
194 /* Always accept link here */
195 struct sk_buff
*rbuf
;
196 struct tipc_media_addr
*addr
;
197 struct node
*n_ptr
= tipc_node_find(orig
);
200 dbg(" in own cluster\n");
202 n_ptr
= tipc_node_create(orig
);
206 spin_lock_bh(&n_ptr
->lock
);
207 link
= n_ptr
->links
[b_ptr
->identity
];
209 dbg("creating link\n");
210 link
= tipc_link_create(b_ptr
, orig
, &media_addr
);
212 spin_unlock_bh(&n_ptr
->lock
);
216 addr
= &link
->media_addr
;
217 if (memcmp(addr
, &media_addr
, sizeof(*addr
))) {
218 if (tipc_link_is_up(link
) || (!link
->started
)) {
219 disc_dupl_alert(b_ptr
, orig
, &media_addr
);
220 spin_unlock_bh(&n_ptr
->lock
);
223 warn("Resetting link <%s>, peer interface address changed\n",
225 memcpy(addr
, &media_addr
, sizeof(*addr
));
226 tipc_link_reset(link
);
228 link_fully_up
= (link
->state
== WORKING_WORKING
);
229 spin_unlock_bh(&n_ptr
->lock
);
230 if ((type
== DSC_RESP_MSG
) || link_fully_up
)
232 rbuf
= tipc_disc_init_msg(DSC_RESP_MSG
, 1, orig
, b_ptr
);
234 msg_dbg(buf_msg(rbuf
),"SEND:");
235 b_ptr
->media
->send_msg(rbuf
, &b_ptr
->publ
, &media_addr
);
242 * tipc_disc_stop_link_req - stop sending periodic link setup requests
243 * @req: ptr to link request structure
246 void tipc_disc_stop_link_req(struct link_req
*req
)
251 k_cancel_timer(&req
->timer
);
252 k_term_timer(&req
->timer
);
253 buf_discard(req
->buf
);
258 * tipc_disc_update_link_req - update frequency of periodic link setup requests
259 * @req: ptr to link request structure
262 void tipc_disc_update_link_req(struct link_req
*req
)
267 if (req
->timer_intv
== TIPC_LINK_REQ_SLOW
) {
268 if (!req
->bearer
->nodes
.count
) {
269 req
->timer_intv
= TIPC_LINK_REQ_FAST
;
270 k_start_timer(&req
->timer
, req
->timer_intv
);
272 } else if (req
->timer_intv
== TIPC_LINK_REQ_FAST
) {
273 if (req
->bearer
->nodes
.count
) {
274 req
->timer_intv
= TIPC_LINK_REQ_SLOW
;
275 k_start_timer(&req
->timer
, req
->timer_intv
);
278 /* leave timer "as is" if haven't yet reached a "normal" rate */
283 * disc_timeout - send a periodic link setup request
284 * @req: ptr to link request structure
286 * Called whenever a link setup request timer associated with a bearer expires.
289 static void disc_timeout(struct link_req
*req
)
291 spin_lock_bh(&req
->bearer
->publ
.lock
);
293 req
->bearer
->media
->send_msg(req
->buf
, &req
->bearer
->publ
, &req
->dest
);
295 if ((req
->timer_intv
== TIPC_LINK_REQ_SLOW
) ||
296 (req
->timer_intv
== TIPC_LINK_REQ_FAST
)) {
297 /* leave timer interval "as is" if already at a "normal" rate */
299 req
->timer_intv
*= 2;
300 if (req
->timer_intv
> TIPC_LINK_REQ_FAST
)
301 req
->timer_intv
= TIPC_LINK_REQ_FAST
;
302 if ((req
->timer_intv
== TIPC_LINK_REQ_FAST
) &&
303 (req
->bearer
->nodes
.count
))
304 req
->timer_intv
= TIPC_LINK_REQ_SLOW
;
306 k_start_timer(&req
->timer
, req
->timer_intv
);
308 spin_unlock_bh(&req
->bearer
->publ
.lock
);
312 * tipc_disc_init_link_req - start sending periodic link setup requests
313 * @b_ptr: ptr to bearer issuing requests
314 * @dest: destination address for request messages
315 * @dest_domain: network domain of node(s) which should respond to message
316 * @req_links: max number of desired links
318 * Returns pointer to link request structure, or NULL if unable to create.
321 struct link_req
*tipc_disc_init_link_req(struct bearer
*b_ptr
,
322 const struct tipc_media_addr
*dest
,
326 struct link_req
*req
;
328 req
= kmalloc(sizeof(*req
), GFP_ATOMIC
);
332 req
->buf
= tipc_disc_init_msg(DSC_REQ_MSG
, req_links
, dest_domain
, b_ptr
);
338 memcpy(&req
->dest
, dest
, sizeof(*dest
));
340 req
->timer_intv
= TIPC_LINK_REQ_INIT
;
341 k_init_timer(&req
->timer
, (Handler
)disc_timeout
, (unsigned long)req
);
342 k_start_timer(&req
->timer
, req
->timer_intv
);