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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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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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 tipc_msg_init(msg
, LINK_CONFIG
, type
, DSC_H_SIZE
, dest_domain
);
124 msg_set_non_seq(msg
, 1);
125 msg_set_req_links(msg
, req_links
);
126 msg_set_dest_domain(msg
, dest_domain
);
127 msg_set_bc_netid(msg
, tipc_net_id
);
128 msg_set_media_addr(msg
, &b_ptr
->publ
.addr
);
134 * disc_dupl_alert - issue node address duplication alert
135 * @b_ptr: pointer to bearer detecting duplication
136 * @node_addr: duplicated node address
137 * @media_addr: media address advertised by duplicated node
140 static void disc_dupl_alert(struct bearer
*b_ptr
, u32 node_addr
,
141 struct tipc_media_addr
*media_addr
)
143 char node_addr_str
[16];
144 char media_addr_str
[64];
147 tipc_addr_string_fill(node_addr_str
, node_addr
);
148 tipc_printbuf_init(&pb
, media_addr_str
, sizeof(media_addr_str
));
149 tipc_media_addr_printf(&pb
, media_addr
);
150 tipc_printbuf_validate(&pb
);
151 warn("Duplicate %s using %s seen on <%s>\n",
152 node_addr_str
, media_addr_str
, b_ptr
->publ
.name
);
156 * tipc_disc_recv_msg - handle incoming link setup message (request or response)
157 * @buf: buffer containing message
158 * @b_ptr: bearer that message arrived on
161 void tipc_disc_recv_msg(struct sk_buff
*buf
, struct bearer
*b_ptr
)
164 struct tipc_media_addr media_addr
;
165 struct tipc_msg
*msg
= buf_msg(buf
);
166 u32 dest
= msg_dest_domain(msg
);
167 u32 orig
= msg_prevnode(msg
);
168 u32 net_id
= msg_bc_netid(msg
);
169 u32 type
= msg_type(msg
);
171 msg_get_media_addr(msg
,&media_addr
);
172 msg_dbg(msg
, "RECV:");
175 if (net_id
!= tipc_net_id
)
177 if (!tipc_addr_domain_valid(dest
))
179 if (!tipc_addr_node_valid(orig
))
181 if (orig
== tipc_own_addr
) {
182 if (memcmp(&media_addr
, &b_ptr
->publ
.addr
, sizeof(media_addr
)))
183 disc_dupl_alert(b_ptr
, tipc_own_addr
, &media_addr
);
186 if (!tipc_in_scope(dest
, tipc_own_addr
))
188 if (is_slave(tipc_own_addr
) && is_slave(orig
))
190 if (is_slave(orig
) && !in_own_cluster(orig
))
192 if (in_own_cluster(orig
)) {
193 /* Always accept link here */
194 struct sk_buff
*rbuf
;
195 struct tipc_media_addr
*addr
;
196 struct tipc_node
*n_ptr
= tipc_node_find(orig
);
199 dbg(" in own cluster\n");
201 n_ptr
= tipc_node_create(orig
);
205 spin_lock_bh(&n_ptr
->lock
);
207 /* Don't talk to neighbor during cleanup after last session */
209 if (n_ptr
->cleanup_required
) {
210 spin_unlock_bh(&n_ptr
->lock
);
214 link
= n_ptr
->links
[b_ptr
->identity
];
216 dbg("creating link\n");
217 link
= tipc_link_create(b_ptr
, orig
, &media_addr
);
219 spin_unlock_bh(&n_ptr
->lock
);
223 addr
= &link
->media_addr
;
224 if (memcmp(addr
, &media_addr
, sizeof(*addr
))) {
225 if (tipc_link_is_up(link
) || (!link
->started
)) {
226 disc_dupl_alert(b_ptr
, orig
, &media_addr
);
227 spin_unlock_bh(&n_ptr
->lock
);
230 warn("Resetting link <%s>, peer interface address changed\n",
232 memcpy(addr
, &media_addr
, sizeof(*addr
));
233 tipc_link_reset(link
);
235 link_fully_up
= link_working_working(link
);
236 spin_unlock_bh(&n_ptr
->lock
);
237 if ((type
== DSC_RESP_MSG
) || link_fully_up
)
239 rbuf
= tipc_disc_init_msg(DSC_RESP_MSG
, 1, orig
, b_ptr
);
241 msg_dbg(buf_msg(rbuf
),"SEND:");
242 b_ptr
->media
->send_msg(rbuf
, &b_ptr
->publ
, &media_addr
);
249 * tipc_disc_stop_link_req - stop sending periodic link setup requests
250 * @req: ptr to link request structure
253 void tipc_disc_stop_link_req(struct link_req
*req
)
258 k_cancel_timer(&req
->timer
);
259 k_term_timer(&req
->timer
);
260 buf_discard(req
->buf
);
265 * tipc_disc_update_link_req - update frequency of periodic link setup requests
266 * @req: ptr to link request structure
269 void tipc_disc_update_link_req(struct link_req
*req
)
274 if (req
->timer_intv
== TIPC_LINK_REQ_SLOW
) {
275 if (!req
->bearer
->nodes
.count
) {
276 req
->timer_intv
= TIPC_LINK_REQ_FAST
;
277 k_start_timer(&req
->timer
, req
->timer_intv
);
279 } else if (req
->timer_intv
== TIPC_LINK_REQ_FAST
) {
280 if (req
->bearer
->nodes
.count
) {
281 req
->timer_intv
= TIPC_LINK_REQ_SLOW
;
282 k_start_timer(&req
->timer
, req
->timer_intv
);
285 /* leave timer "as is" if haven't yet reached a "normal" rate */
290 * disc_timeout - send a periodic link setup request
291 * @req: ptr to link request structure
293 * Called whenever a link setup request timer associated with a bearer expires.
296 static void disc_timeout(struct link_req
*req
)
298 spin_lock_bh(&req
->bearer
->publ
.lock
);
300 req
->bearer
->media
->send_msg(req
->buf
, &req
->bearer
->publ
, &req
->dest
);
302 if ((req
->timer_intv
== TIPC_LINK_REQ_SLOW
) ||
303 (req
->timer_intv
== TIPC_LINK_REQ_FAST
)) {
304 /* leave timer interval "as is" if already at a "normal" rate */
306 req
->timer_intv
*= 2;
307 if (req
->timer_intv
> TIPC_LINK_REQ_FAST
)
308 req
->timer_intv
= TIPC_LINK_REQ_FAST
;
309 if ((req
->timer_intv
== TIPC_LINK_REQ_FAST
) &&
310 (req
->bearer
->nodes
.count
))
311 req
->timer_intv
= TIPC_LINK_REQ_SLOW
;
313 k_start_timer(&req
->timer
, req
->timer_intv
);
315 spin_unlock_bh(&req
->bearer
->publ
.lock
);
319 * tipc_disc_init_link_req - start sending periodic link setup requests
320 * @b_ptr: ptr to bearer issuing requests
321 * @dest: destination address for request messages
322 * @dest_domain: network domain of node(s) which should respond to message
323 * @req_links: max number of desired links
325 * Returns pointer to link request structure, or NULL if unable to create.
328 struct link_req
*tipc_disc_init_link_req(struct bearer
*b_ptr
,
329 const struct tipc_media_addr
*dest
,
333 struct link_req
*req
;
335 req
= kmalloc(sizeof(*req
), GFP_ATOMIC
);
339 req
->buf
= tipc_disc_init_msg(DSC_REQ_MSG
, req_links
, dest_domain
, b_ptr
);
345 memcpy(&req
->dest
, dest
, sizeof(*dest
));
347 req
->timer_intv
= TIPC_LINK_REQ_INIT
;
348 k_init_timer(&req
->timer
, (Handler
)disc_timeout
, (unsigned long)req
);
349 k_start_timer(&req
->timer
, req
->timer_intv
);