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Merge branch 'master' into upstream-fixes
[linux.git] / net / tipc / link.c
CommitLineData
b97bf3fd
PL		 1/*
2 * net/tipc/link.c: TIPC link code
3 *
593a5f22 4 * Copyright (c) 1996-2006, Ericsson AB
e49060c7 5 * Copyright (c) 2004-2006, Wind River Systems
b97bf3fd
PL		 6 * All rights reserved.
7 *
9ea1fd3c 8 * Redistribution and use in source and binary forms, with or without
b97bf3fd
PL		 9 * modification, are permitted provided that the following conditions are met:
10 *
9ea1fd3c
PL		 11 * 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.
b97bf3fd 19 *
9ea1fd3c
PL		 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.
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
b97bf3fd
PL		 34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "dbg.h"
39#include "link.h"
40#include "net.h"
41#include "node.h"
42#include "port.h"
43#include "addr.h"
44#include "node_subscr.h"
45#include "name_distr.h"
46#include "bearer.h"
47#include "name_table.h"
48#include "discover.h"
49#include "config.h"
50#include "bcast.h"
51
52
53/*
54 * Limit for deferred reception queue:
55 */
56
57#define DEF_QUEUE_LIMIT 256u
58
59/*
60 * Link state events:
61 */
62
63#define STARTING_EVT 856384768 /* link processing trigger */
64#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
65#define TIMEOUT_EVT 560817u /* link timer expired */
66
67/*
68 * The following two 'message types' is really just implementation
69 * data conveniently stored in the message header.
70 * They must not be considered part of the protocol
71 */
72#define OPEN_MSG 0
73#define CLOSED_MSG 1
74
75/*
76 * State value stored in 'exp_msg_count'
77 */
78
79#define START_CHANGEOVER 100000u
80
81/**
82 * struct link_name - deconstructed link name
83 * @addr_local: network address of node at this end
84 * @if_local: name of interface at this end
85 * @addr_peer: network address of node at far end
86 * @if_peer: name of interface at far end
87 */
88
89struct link_name {
90 u32 addr_local;
91 char if_local[TIPC_MAX_IF_NAME];
92 u32 addr_peer;
93 char if_peer[TIPC_MAX_IF_NAME];
94};
95
96#if 0
97
98/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
99
100/**
101 * struct link_event - link up/down event notification
102 */
103
104struct link_event {
105 u32 addr;
106 int up;
107 void (*fcn)(u32, char *, int);
108 char name[TIPC_MAX_LINK_NAME];
109};
110
111#endif
112
113static void link_handle_out_of_seq_msg(struct link *l_ptr,
114 struct sk_buff *buf);
115static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
116static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
117static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
118static int link_send_sections_long(struct port *sender,
119 struct iovec const *msg_sect,
120 u32 num_sect, u32 destnode);
121static void link_check_defragm_bufs(struct link *l_ptr);
122static void link_state_event(struct link *l_ptr, u32 event);
123static void link_reset_statistics(struct link *l_ptr);
124static void link_print(struct link *l_ptr, struct print_buf *buf,
125 const char *str);
126
127/*
128 * Debugging code used by link routines only
129 *
130 * When debugging link problems on a system that has multiple links,
131 * the standard TIPC debugging routines may not be useful since they
132 * allow the output from multiple links to be intermixed. For this reason
133 * routines of the form "dbg_link_XXX()" have been created that will capture
134 * debug info into a link's personal print buffer, which can then be dumped
135 * into the TIPC system log (LOG) upon request.
136 *
137 * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
138 * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
139 * the dbg_link_XXX() routines simply send their output to the standard
140 * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
141 * when there is only a single link in the system being debugged.
142 *
143 * Notes:
144 * - When enabled, LINK_LOG_BUF_SIZE should be set to at least 1000 (bytes)
145 * - "l_ptr" must be valid when using dbg_link_XXX() macros
146 */
147
148#define LINK_LOG_BUF_SIZE 0
149
150#define dbg_link(fmt, arg...) do {if (LINK_LOG_BUF_SIZE) tipc_printf(&l_ptr->print_buf, fmt, ## arg); } while(0)
4323add6 151#define dbg_link_msg(msg, txt) do {if (LINK_LOG_BUF_SIZE) tipc_msg_print(&l_ptr->print_buf, msg, txt); } while(0)
b97bf3fd
PL		 152#define dbg_link_state(txt) do {if (LINK_LOG_BUF_SIZE) link_print(l_ptr, &l_ptr->print_buf, txt); } while(0)
153#define dbg_link_dump() do { \
154 if (LINK_LOG_BUF_SIZE) { \
155 tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
4323add6 156 tipc_printbuf_move(LOG, &l_ptr->print_buf); \
b97bf3fd
PL		 157 } \
158} while (0)
159
05790c64 160static void dbg_print_link(struct link *l_ptr, const char *str)
b97bf3fd
PL		 161{
162 if (DBG_OUTPUT)
163 link_print(l_ptr, DBG_OUTPUT, str);
164}
165
05790c64 166static void dbg_print_buf_chain(struct sk_buff *root_buf)
b97bf3fd
PL		 167{
168 if (DBG_OUTPUT) {
169 struct sk_buff *buf = root_buf;
170
171 while (buf) {
172 msg_dbg(buf_msg(buf), "In chain: ");
173 buf = buf->next;
174 }
175 }
176}
177
178/*
05790c64 179 * Simple link routines
b97bf3fd
PL		 180 */
181
05790c64 182static unsigned int align(unsigned int i)
b97bf3fd
PL		 183{
184 return (i + 3) & ~3u;
185}
186
05790c64 187static int link_working_working(struct link *l_ptr)
b97bf3fd
PL		 188{
189 return (l_ptr->state == WORKING_WORKING);
190}
191
05790c64 192static int link_working_unknown(struct link *l_ptr)
b97bf3fd
PL		 193{
194 return (l_ptr->state == WORKING_UNKNOWN);
195}
196
05790c64 197static int link_reset_unknown(struct link *l_ptr)
b97bf3fd
PL		 198{
199 return (l_ptr->state == RESET_UNKNOWN);
200}
201
05790c64 202static int link_reset_reset(struct link *l_ptr)
b97bf3fd
PL		 203{
204 return (l_ptr->state == RESET_RESET);
205}
206
05790c64 207static int link_blocked(struct link *l_ptr)
b97bf3fd
PL		 208{
209 return (l_ptr->exp_msg_count || l_ptr->blocked);
210}
211
05790c64 212static int link_congested(struct link *l_ptr)
b97bf3fd
PL		 213{
214 return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
215}
216
05790c64 217static u32 link_max_pkt(struct link *l_ptr)
b97bf3fd
PL		 218{
219 return l_ptr->max_pkt;
220}
221
05790c64 222static void link_init_max_pkt(struct link *l_ptr)
b97bf3fd
PL		 223{
224 u32 max_pkt;
225
226 max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
227 if (max_pkt > MAX_MSG_SIZE)
228 max_pkt = MAX_MSG_SIZE;
229
230 l_ptr->max_pkt_target = max_pkt;
231 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
232 l_ptr->max_pkt = l_ptr->max_pkt_target;
233 else
234 l_ptr->max_pkt = MAX_PKT_DEFAULT;
235
236 l_ptr->max_pkt_probes = 0;
237}
238
05790c64 239static u32 link_next_sent(struct link *l_ptr)
b97bf3fd
PL		 240{
241 if (l_ptr->next_out)
242 return msg_seqno(buf_msg(l_ptr->next_out));
243 return mod(l_ptr->next_out_no);
244}
245
05790c64 246static u32 link_last_sent(struct link *l_ptr)
b97bf3fd
PL		 247{
248 return mod(link_next_sent(l_ptr) - 1);
249}
250
251/*
05790c64 252 * Simple non-static link routines (i.e. referenced outside this file)
b97bf3fd
PL		 253 */
254
4323add6 255int tipc_link_is_up(struct link *l_ptr)
b97bf3fd
PL		 256{
257 if (!l_ptr)
258 return 0;
259 return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
260}
261
4323add6 262int tipc_link_is_active(struct link *l_ptr)
b97bf3fd
PL		 263{
264 return ((l_ptr->owner->active_links[0] == l_ptr) ||
265 (l_ptr->owner->active_links[1] == l_ptr));
266}
267
268/**
269 * link_name_validate - validate & (optionally) deconstruct link name
270 * @name - ptr to link name string
271 * @name_parts - ptr to area for link name components (or NULL if not needed)
272 *
273 * Returns 1 if link name is valid, otherwise 0.
274 */
275
276static int link_name_validate(const char *name, struct link_name *name_parts)
277{
278 char name_copy[TIPC_MAX_LINK_NAME];
279 char *addr_local;
280 char *if_local;
281 char *addr_peer;
282 char *if_peer;
283 char dummy;
284 u32 z_local, c_local, n_local;
285 u32 z_peer, c_peer, n_peer;
286 u32 if_local_len;
287 u32 if_peer_len;
288
289 /* copy link name & ensure length is OK */
290
291 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
292 /* need above in case non-Posix strncpy() doesn't pad with nulls */
293 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
294 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
295 return 0;
296
297 /* ensure all component parts of link name are present */
298
299 addr_local = name_copy;
300 if ((if_local = strchr(addr_local, ':')) == NULL)
301 return 0;
302 *(if_local++) = 0;
303 if ((addr_peer = strchr(if_local, '-')) == NULL)
304 return 0;
305 *(addr_peer++) = 0;
306 if_local_len = addr_peer - if_local;
307 if ((if_peer = strchr(addr_peer, ':')) == NULL)
308 return 0;
309 *(if_peer++) = 0;
310 if_peer_len = strlen(if_peer) + 1;
311
312 /* validate component parts of link name */
313
314 if ((sscanf(addr_local, "%u.%u.%u%c",
315 &z_local, &c_local, &n_local, &dummy) != 3) ||
316 (sscanf(addr_peer, "%u.%u.%u%c",
317 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
318 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
319 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
320 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
321 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
322 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
323 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
324 return 0;
325
326 /* return link name components, if necessary */
327
328 if (name_parts) {
329 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
330 strcpy(name_parts->if_local, if_local);
331 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
332 strcpy(name_parts->if_peer, if_peer);
333 }
334 return 1;
335}
336
337/**
338 * link_timeout - handle expiration of link timer
339 * @l_ptr: pointer to link
340 *
4323add6
PL		 341 * This routine must not grab "tipc_net_lock" to avoid a potential deadlock conflict
342 * with tipc_link_delete(). (There is no risk that the node will be deleted by
343 * another thread because tipc_link_delete() always cancels the link timer before
344 * tipc_node_delete() is called.)
b97bf3fd
PL		 345 */
346
347static void link_timeout(struct link *l_ptr)
348{
4323add6 349 tipc_node_lock(l_ptr->owner);
b97bf3fd
PL		 350
351 /* update counters used in statistical profiling of send traffic */
352
353 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
354 l_ptr->stats.queue_sz_counts++;
355
356 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
357 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
358
359 if (l_ptr->first_out) {
360 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
361 u32 length = msg_size(msg);
362
363 if ((msg_user(msg) == MSG_FRAGMENTER)
364 && (msg_type(msg) == FIRST_FRAGMENT)) {
365 length = msg_size(msg_get_wrapped(msg));
366 }
367 if (length) {
368 l_ptr->stats.msg_lengths_total += length;
369 l_ptr->stats.msg_length_counts++;
370 if (length <= 64)
371 l_ptr->stats.msg_length_profile[0]++;
372 else if (length <= 256)
373 l_ptr->stats.msg_length_profile[1]++;
374 else if (length <= 1024)
375 l_ptr->stats.msg_length_profile[2]++;
376 else if (length <= 4096)
377 l_ptr->stats.msg_length_profile[3]++;
378 else if (length <= 16384)
379 l_ptr->stats.msg_length_profile[4]++;
380 else if (length <= 32768)
381 l_ptr->stats.msg_length_profile[5]++;
382 else
383 l_ptr->stats.msg_length_profile[6]++;
384 }
385 }
386
387 /* do all other link processing performed on a periodic basis */
388
389 link_check_defragm_bufs(l_ptr);
390
391 link_state_event(l_ptr, TIMEOUT_EVT);
392
393 if (l_ptr->next_out)
4323add6 394 tipc_link_push_queue(l_ptr);
b97bf3fd 395
4323add6 396 tipc_node_unlock(l_ptr->owner);
b97bf3fd
PL		 397}
398
05790c64 399static void link_set_timer(struct link *l_ptr, u32 time)
b97bf3fd
PL		 400{
401 k_start_timer(&l_ptr->timer, time);
402}
403
404/**
4323add6 405 * tipc_link_create - create a new link
b97bf3fd
PL		 406 * @b_ptr: pointer to associated bearer
407 * @peer: network address of node at other end of link
408 * @media_addr: media address to use when sending messages over link
409 *
410 * Returns pointer to link.
411 */
412
4323add6
PL		 413struct link *tipc_link_create(struct bearer *b_ptr, const u32 peer,
414 const struct tipc_media_addr *media_addr)
b97bf3fd
PL		 415{
416 struct link *l_ptr;
417 struct tipc_msg *msg;
418 char *if_name;
419
0da974f4 420 l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
b97bf3fd 421 if (!l_ptr) {
a10bd924 422 warn("Link creation failed, no memory\n");
b97bf3fd
PL		 423 return NULL;
424 }
b97bf3fd
PL		 425
426 l_ptr->addr = peer;
427 if_name = strchr(b_ptr->publ.name, ':') + 1;
428 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
429 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
430 tipc_node(tipc_own_addr),
431 if_name,
432 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
433 /* note: peer i/f is appended to link name by reset/activate */
434 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
435 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
436 list_add_tail(&l_ptr->link_list, &b_ptr->links);
437 l_ptr->checkpoint = 1;
438 l_ptr->b_ptr = b_ptr;
439 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
440 l_ptr->state = RESET_UNKNOWN;
441
442 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
443 msg = l_ptr->pmsg;
444 msg_init(msg, LINK_PROTOCOL, RESET_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
445 msg_set_size(msg, sizeof(l_ptr->proto_msg));
446 msg_set_session(msg, tipc_random);
447 msg_set_bearer_id(msg, b_ptr->identity);
448 strcpy((char *)msg_data(msg), if_name);
449
450 l_ptr->priority = b_ptr->priority;
4323add6 451 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
b97bf3fd
PL		 452
453 link_init_max_pkt(l_ptr);
454
455 l_ptr->next_out_no = 1;
456 INIT_LIST_HEAD(&l_ptr->waiting_ports);
457
458 link_reset_statistics(l_ptr);
459
4323add6 460 l_ptr->owner = tipc_node_attach_link(l_ptr);
b97bf3fd
PL		 461 if (!l_ptr->owner) {
462 kfree(l_ptr);
463 return NULL;
464 }
465
466 if (LINK_LOG_BUF_SIZE) {
467 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
468
469 if (!pb) {
470 kfree(l_ptr);
a10bd924 471 warn("Link creation failed, no memory for print buffer\n");
b97bf3fd
PL		 472 return NULL;
473 }
4323add6 474 tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
b97bf3fd
PL		 475 }
476
4323add6 477 tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
b97bf3fd 478
4323add6 479 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
b97bf3fd
PL		 480 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
481
482 return l_ptr;
483}
484
485/**
4323add6 486 * tipc_link_delete - delete a link
b97bf3fd
PL		 487 * @l_ptr: pointer to link
488 *
4323add6 489 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
b97bf3fd
PL		 490 * This routine must not grab the node lock until after link timer cancellation
491 * to avoid a potential deadlock situation.
492 */
493
4323add6 494void tipc_link_delete(struct link *l_ptr)
b97bf3fd
PL		 495{
496 if (!l_ptr) {
497 err("Attempt to delete non-existent link\n");
498 return;
499 }
500
4323add6 501 dbg("tipc_link_delete()\n");
b97bf3fd
PL		 502
503 k_cancel_timer(&l_ptr->timer);
504
4323add6
PL		 505 tipc_node_lock(l_ptr->owner);
506 tipc_link_reset(l_ptr);
507 tipc_node_detach_link(l_ptr->owner, l_ptr);
508 tipc_link_stop(l_ptr);
b97bf3fd
PL		 509 list_del_init(&l_ptr->link_list);
510 if (LINK_LOG_BUF_SIZE)
511 kfree(l_ptr->print_buf.buf);
4323add6 512 tipc_node_unlock(l_ptr->owner);
b97bf3fd
PL		 513 k_term_timer(&l_ptr->timer);
514 kfree(l_ptr);
515}
516
4323add6 517void tipc_link_start(struct link *l_ptr)
b97bf3fd 518{
4323add6 519 dbg("tipc_link_start %x\n", l_ptr);
b97bf3fd
PL		 520 link_state_event(l_ptr, STARTING_EVT);
521}
522
523/**
524 * link_schedule_port - schedule port for deferred sending
525 * @l_ptr: pointer to link
526 * @origport: reference to sending port
527 * @sz: amount of data to be sent
528 *
529 * Schedules port for renewed sending of messages after link congestion
530 * has abated.
531 */
532
533static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
534{
535 struct port *p_ptr;
536
4323add6
PL		 537 spin_lock_bh(&tipc_port_list_lock);
538 p_ptr = tipc_port_lock(origport);
b97bf3fd
PL		 539 if (p_ptr) {
540 if (!p_ptr->wakeup)
541 goto exit;
542 if (!list_empty(&p_ptr->wait_list))
543 goto exit;
544 p_ptr->congested_link = l_ptr;
545 p_ptr->publ.congested = 1;
546 p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
547 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
548 l_ptr->stats.link_congs++;
549exit:
4323add6 550 tipc_port_unlock(p_ptr);
b97bf3fd 551 }
4323add6 552 spin_unlock_bh(&tipc_port_list_lock);
b97bf3fd
PL		 553 return -ELINKCONG;
554}
555
4323add6 556void tipc_link_wakeup_ports(struct link *l_ptr, int all)
b97bf3fd
PL		 557{
558 struct port *p_ptr;
559 struct port *temp_p_ptr;
560 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
561
562 if (all)
563 win = 100000;
564 if (win <= 0)
565 return;
4323add6 566 if (!spin_trylock_bh(&tipc_port_list_lock))
b97bf3fd
PL		 567 return;
568 if (link_congested(l_ptr))
569 goto exit;
570 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
571 wait_list) {
572 if (win <= 0)
573 break;
574 list_del_init(&p_ptr->wait_list);
1fc54d8f 575 p_ptr->congested_link = NULL;
b97bf3fd
PL		 576 spin_lock_bh(p_ptr->publ.lock);
577 p_ptr->publ.congested = 0;
578 p_ptr->wakeup(&p_ptr->publ);
579 win -= p_ptr->waiting_pkts;
580 spin_unlock_bh(p_ptr->publ.lock);
581 }
582
583exit:
4323add6 584 spin_unlock_bh(&tipc_port_list_lock);
b97bf3fd
PL		 585}
586
587/**
588 * link_release_outqueue - purge link's outbound message queue
589 * @l_ptr: pointer to link
590 */
591
592static void link_release_outqueue(struct link *l_ptr)
593{
594 struct sk_buff *buf = l_ptr->first_out;
595 struct sk_buff *next;
596
597 while (buf) {
598 next = buf->next;
599 buf_discard(buf);
600 buf = next;
601 }
602 l_ptr->first_out = NULL;
603 l_ptr->out_queue_size = 0;
604}
605
606/**
4323add6 607 * tipc_link_reset_fragments - purge link's inbound message fragments queue
b97bf3fd
PL		 608 * @l_ptr: pointer to link
609 */
610
4323add6 611void tipc_link_reset_fragments(struct link *l_ptr)
b97bf3fd
PL		 612{
613 struct sk_buff *buf = l_ptr->defragm_buf;
614 struct sk_buff *next;
615
616 while (buf) {
617 next = buf->next;
618 buf_discard(buf);
619 buf = next;
620 }
621 l_ptr->defragm_buf = NULL;
622}
623
624/**
4323add6 625 * tipc_link_stop - purge all inbound and outbound messages associated with link
b97bf3fd
PL		 626 * @l_ptr: pointer to link
627 */
628
4323add6 629void tipc_link_stop(struct link *l_ptr)
b97bf3fd
PL		 630{
631 struct sk_buff *buf;
632 struct sk_buff *next;
633
634 buf = l_ptr->oldest_deferred_in;
635 while (buf) {
636 next = buf->next;
637 buf_discard(buf);
638 buf = next;
639 }
640
641 buf = l_ptr->first_out;
642 while (buf) {
643 next = buf->next;
644 buf_discard(buf);
645 buf = next;
646 }
647
4323add6 648 tipc_link_reset_fragments(l_ptr);
b97bf3fd
PL		 649
650 buf_discard(l_ptr->proto_msg_queue);
651 l_ptr->proto_msg_queue = NULL;
652}
653
654#if 0
655
656/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
657
658static void link_recv_event(struct link_event *ev)
659{
660 ev->fcn(ev->addr, ev->name, ev->up);
661 kfree(ev);
662}
663
664static void link_send_event(void (*fcn)(u32 a, char *n, int up),
665 struct link *l_ptr, int up)
666{
667 struct link_event *ev;
668
669 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
670 if (!ev) {
671 warn("Link event allocation failure\n");
672 return;
673 }
674 ev->addr = l_ptr->addr;
675 ev->up = up;
676 ev->fcn = fcn;
677 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
4323add6 678 tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
b97bf3fd
PL		 679}
680
681#else
682
683#define link_send_event(fcn, l_ptr, up) do { } while (0)
684
685#endif
686
4323add6 687void tipc_link_reset(struct link *l_ptr)
b97bf3fd
PL		 688{
689 struct sk_buff *buf;
690 u32 prev_state = l_ptr->state;
691 u32 checkpoint = l_ptr->next_in_no;
5392d646 692 int was_active_link = tipc_link_is_active(l_ptr);
b97bf3fd
PL		 693
694 msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
695
696 /* Link is down, accept any session: */
697 l_ptr->peer_session = 0;
698
699 /* Prepare for max packet size negotiation */
700 link_init_max_pkt(l_ptr);
701
702 l_ptr->state = RESET_UNKNOWN;
703 dbg_link_state("Resetting Link\n");
704
705 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
706 return;
707
4323add6
PL		 708 tipc_node_link_down(l_ptr->owner, l_ptr);
709 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
b97bf3fd 710#if 0
4323add6 711 tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
b97bf3fd
PL		 712 dbg_link_dump();
713#endif
5392d646 714 if (was_active_link && tipc_node_has_active_links(l_ptr->owner) &&
b97bf3fd
PL		 715 l_ptr->owner->permit_changeover) {
716 l_ptr->reset_checkpoint = checkpoint;
717 l_ptr->exp_msg_count = START_CHANGEOVER;
718 }
719
720 /* Clean up all queues: */
721
722 link_release_outqueue(l_ptr);
723 buf_discard(l_ptr->proto_msg_queue);
724 l_ptr->proto_msg_queue = NULL;
725 buf = l_ptr->oldest_deferred_in;
726 while (buf) {
727 struct sk_buff *next = buf->next;
728 buf_discard(buf);
729 buf = next;
730 }
731 if (!list_empty(&l_ptr->waiting_ports))
4323add6 732 tipc_link_wakeup_ports(l_ptr, 1);
b97bf3fd
PL		 733
734 l_ptr->retransm_queue_head = 0;
735 l_ptr->retransm_queue_size = 0;
736 l_ptr->last_out = NULL;
737 l_ptr->first_out = NULL;
738 l_ptr->next_out = NULL;
739 l_ptr->unacked_window = 0;
740 l_ptr->checkpoint = 1;
741 l_ptr->next_out_no = 1;
742 l_ptr->deferred_inqueue_sz = 0;
743 l_ptr->oldest_deferred_in = NULL;
744 l_ptr->newest_deferred_in = NULL;
745 l_ptr->fsm_msg_cnt = 0;
746 l_ptr->stale_count = 0;
747 link_reset_statistics(l_ptr);
748
4323add6 749 link_send_event(tipc_cfg_link_event, l_ptr, 0);
b97bf3fd 750 if (!in_own_cluster(l_ptr->addr))
4323add6 751 link_send_event(tipc_disc_link_event, l_ptr, 0);
b97bf3fd
PL		 752}
753
754
755static void link_activate(struct link *l_ptr)
756{
5392d646 757 l_ptr->next_in_no = l_ptr->stats.recv_info = 1;
4323add6
PL		 758 tipc_node_link_up(l_ptr->owner, l_ptr);
759 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
760 link_send_event(tipc_cfg_link_event, l_ptr, 1);
b97bf3fd 761 if (!in_own_cluster(l_ptr->addr))
4323add6 762 link_send_event(tipc_disc_link_event, l_ptr, 1);
b97bf3fd
PL		 763}
764
765/**
766 * link_state_event - link finite state machine
767 * @l_ptr: pointer to link
768 * @event: state machine event to process
769 */
770
771static void link_state_event(struct link *l_ptr, unsigned event)
772{
773 struct link *other;
774 u32 cont_intv = l_ptr->continuity_interval;
775
776 if (!l_ptr->started && (event != STARTING_EVT))
777 return; /* Not yet. */
778
779 if (link_blocked(l_ptr)) {
780 if (event == TIMEOUT_EVT) {
781 link_set_timer(l_ptr, cont_intv);
782 }
783 return; /* Changeover going on */
784 }
785 dbg_link("STATE_EV: <%s> ", l_ptr->name);
786
787 switch (l_ptr->state) {
788 case WORKING_WORKING:
789 dbg_link("WW/");
790 switch (event) {
791 case TRAFFIC_MSG_EVT:
792 dbg_link("TRF-");
793 /* fall through */
794 case ACTIVATE_MSG:
795 dbg_link("ACT\n");
796 break;
797 case TIMEOUT_EVT:
798 dbg_link("TIM ");
799 if (l_ptr->next_in_no != l_ptr->checkpoint) {
800 l_ptr->checkpoint = l_ptr->next_in_no;
4323add6
PL		 801 if (tipc_bclink_acks_missing(l_ptr->owner)) {
802 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
803 0, 0, 0, 0, 0);
b97bf3fd
PL		 804 l_ptr->fsm_msg_cnt++;
805 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
4323add6
PL		 806 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
807 1, 0, 0, 0, 0);
b97bf3fd
PL		 808 l_ptr->fsm_msg_cnt++;
809 }
810 link_set_timer(l_ptr, cont_intv);
811 break;
812 }
813 dbg_link(" -> WU\n");
814 l_ptr->state = WORKING_UNKNOWN;
815 l_ptr->fsm_msg_cnt = 0;
4323add6 816 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 817 l_ptr->fsm_msg_cnt++;
818 link_set_timer(l_ptr, cont_intv / 4);
819 break;
820 case RESET_MSG:
821 dbg_link("RES -> RR\n");
a10bd924
AS		 822 info("Resetting link <%s>, requested by peer\n",
823 l_ptr->name);
4323add6 824 tipc_link_reset(l_ptr);
b97bf3fd
PL		 825 l_ptr->state = RESET_RESET;
826 l_ptr->fsm_msg_cnt = 0;
4323add6 827 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 828 l_ptr->fsm_msg_cnt++;
829 link_set_timer(l_ptr, cont_intv);
830 break;
831 default:
832 err("Unknown link event %u in WW state\n", event);
833 }
834 break;
835 case WORKING_UNKNOWN:
836 dbg_link("WU/");
837 switch (event) {
838 case TRAFFIC_MSG_EVT:
839 dbg_link("TRF-");
840 case ACTIVATE_MSG:
841 dbg_link("ACT -> WW\n");
842 l_ptr->state = WORKING_WORKING;
843 l_ptr->fsm_msg_cnt = 0;
844 link_set_timer(l_ptr, cont_intv);
845 break;
846 case RESET_MSG:
847 dbg_link("RES -> RR\n");
a10bd924
AS		 848 info("Resetting link <%s>, requested by peer "
849 "while probing\n", l_ptr->name);
4323add6 850 tipc_link_reset(l_ptr);
b97bf3fd
PL		 851 l_ptr->state = RESET_RESET;
852 l_ptr->fsm_msg_cnt = 0;
4323add6 853 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 854 l_ptr->fsm_msg_cnt++;
855 link_set_timer(l_ptr, cont_intv);
856 break;
857 case TIMEOUT_EVT:
858 dbg_link("TIM ");
859 if (l_ptr->next_in_no != l_ptr->checkpoint) {
860 dbg_link("-> WW \n");
861 l_ptr->state = WORKING_WORKING;
862 l_ptr->fsm_msg_cnt = 0;
863 l_ptr->checkpoint = l_ptr->next_in_no;
4323add6
PL		 864 if (tipc_bclink_acks_missing(l_ptr->owner)) {
865 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
866 0, 0, 0, 0, 0);
b97bf3fd
PL		 867 l_ptr->fsm_msg_cnt++;
868 }
869 link_set_timer(l_ptr, cont_intv);
870 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
871 dbg_link("Probing %u/%u,timer = %u ms)\n",
872 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
873 cont_intv / 4);
4323add6
PL		 874 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
875 1, 0, 0, 0, 0);
b97bf3fd
PL		 876 l_ptr->fsm_msg_cnt++;
877 link_set_timer(l_ptr, cont_intv / 4);
878 } else { /* Link has failed */
879 dbg_link("-> RU (%u probes unanswered)\n",
880 l_ptr->fsm_msg_cnt);
a10bd924
AS		 881 warn("Resetting link <%s>, peer not responding\n",
882 l_ptr->name);
4323add6 883 tipc_link_reset(l_ptr);
b97bf3fd
PL		 884 l_ptr->state = RESET_UNKNOWN;
885 l_ptr->fsm_msg_cnt = 0;
4323add6
PL		 886 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
887 0, 0, 0, 0, 0);
b97bf3fd
PL		 888 l_ptr->fsm_msg_cnt++;
889 link_set_timer(l_ptr, cont_intv);
890 }
891 break;
892 default:
893 err("Unknown link event %u in WU state\n", event);
894 }
895 break;
896 case RESET_UNKNOWN:
897 dbg_link("RU/");
898 switch (event) {
899 case TRAFFIC_MSG_EVT:
900 dbg_link("TRF-\n");
901 break;
902 case ACTIVATE_MSG:
903 other = l_ptr->owner->active_links[0];
904 if (other && link_working_unknown(other)) {
905 dbg_link("ACT\n");
906 break;
907 }
908 dbg_link("ACT -> WW\n");
909 l_ptr->state = WORKING_WORKING;
910 l_ptr->fsm_msg_cnt = 0;
911 link_activate(l_ptr);
4323add6 912 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 913 l_ptr->fsm_msg_cnt++;
914 link_set_timer(l_ptr, cont_intv);
915 break;
916 case RESET_MSG:
917 dbg_link("RES \n");
918 dbg_link(" -> RR\n");
919 l_ptr->state = RESET_RESET;
920 l_ptr->fsm_msg_cnt = 0;
4323add6 921 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 922 l_ptr->fsm_msg_cnt++;
923 link_set_timer(l_ptr, cont_intv);
924 break;
925 case STARTING_EVT:
926 dbg_link("START-");
927 l_ptr->started = 1;
928 /* fall through */
929 case TIMEOUT_EVT:
930 dbg_link("TIM \n");
4323add6 931 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 932 l_ptr->fsm_msg_cnt++;
933 link_set_timer(l_ptr, cont_intv);
934 break;
935 default:
936 err("Unknown link event %u in RU state\n", event);
937 }
938 break;
939 case RESET_RESET:
940 dbg_link("RR/ ");
941 switch (event) {
942 case TRAFFIC_MSG_EVT:
943 dbg_link("TRF-");
944 /* fall through */
945 case ACTIVATE_MSG:
946 other = l_ptr->owner->active_links[0];
947 if (other && link_working_unknown(other)) {
948 dbg_link("ACT\n");
949 break;
950 }
951 dbg_link("ACT -> WW\n");
952 l_ptr->state = WORKING_WORKING;
953 l_ptr->fsm_msg_cnt = 0;
954 link_activate(l_ptr);
4323add6 955 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 956 l_ptr->fsm_msg_cnt++;
957 link_set_timer(l_ptr, cont_intv);
958 break;
959 case RESET_MSG:
960 dbg_link("RES\n");
961 break;
962 case TIMEOUT_EVT:
963 dbg_link("TIM\n");
4323add6 964 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 965 l_ptr->fsm_msg_cnt++;
966 link_set_timer(l_ptr, cont_intv);
967 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
968 break;
969 default:
970 err("Unknown link event %u in RR state\n", event);
971 }
972 break;
973 default:
974 err("Unknown link state %u/%u\n", l_ptr->state, event);
975 }
976}
977
978/*
979 * link_bundle_buf(): Append contents of a buffer to
980 * the tail of an existing one.
981 */
982
983static int link_bundle_buf(struct link *l_ptr,
984 struct sk_buff *bundler,
985 struct sk_buff *buf)
986{
987 struct tipc_msg *bundler_msg = buf_msg(bundler);
988 struct tipc_msg *msg = buf_msg(buf);
989 u32 size = msg_size(msg);
e49060c7
AS		 990 u32 bundle_size = msg_size(bundler_msg);
991 u32 to_pos = align(bundle_size);
992 u32 pad = to_pos - bundle_size;
b97bf3fd
PL		 993
994 if (msg_user(bundler_msg) != MSG_BUNDLER)
995 return 0;
996 if (msg_type(bundler_msg) != OPEN_MSG)
997 return 0;
e49060c7 998 if (skb_tailroom(bundler) < (pad + size))
b97bf3fd 999 return 0;
863fae66
AS		 1000 if (link_max_pkt(l_ptr) < (to_pos + size))
1001 return 0;
b97bf3fd 1002
e49060c7 1003 skb_put(bundler, pad + size);
b97bf3fd
PL		 1004 memcpy(bundler->data + to_pos, buf->data, size);
1005 msg_set_size(bundler_msg, to_pos + size);
1006 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
1007 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
1008 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
1009 msg_dbg(msg, "PACKD:");
1010 buf_discard(buf);
1011 l_ptr->stats.sent_bundled++;
1012 return 1;
1013}
1014
05790c64
SR		 1015static void link_add_to_outqueue(struct link *l_ptr,
1016 struct sk_buff *buf,
1017 struct tipc_msg *msg)
b97bf3fd
PL		 1018{
1019 u32 ack = mod(l_ptr->next_in_no - 1);
1020 u32 seqno = mod(l_ptr->next_out_no++);
1021
1022 msg_set_word(msg, 2, ((ack << 16) | seqno));
1023 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1024 buf->next = NULL;
1025 if (l_ptr->first_out) {
1026 l_ptr->last_out->next = buf;
1027 l_ptr->last_out = buf;
1028 } else
1029 l_ptr->first_out = l_ptr->last_out = buf;
1030 l_ptr->out_queue_size++;
1031}
1032
1033/*
4323add6 1034 * tipc_link_send_buf() is the 'full path' for messages, called from
b97bf3fd
PL		 1035 * inside TIPC when the 'fast path' in tipc_send_buf
1036 * has failed, and from link_send()
1037 */
1038
4323add6 1039int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
b97bf3fd
PL		 1040{
1041 struct tipc_msg *msg = buf_msg(buf);
1042 u32 size = msg_size(msg);
1043 u32 dsz = msg_data_sz(msg);
1044 u32 queue_size = l_ptr->out_queue_size;
1045 u32 imp = msg_tot_importance(msg);
1046 u32 queue_limit = l_ptr->queue_limit[imp];
1047 u32 max_packet = link_max_pkt(l_ptr);
1048
1049 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1050
1051 /* Match msg importance against queue limits: */
1052
1053 if (unlikely(queue_size >= queue_limit)) {
1054 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1055 return link_schedule_port(l_ptr, msg_origport(msg),
1056 size);
1057 }
1058 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1059 buf_discard(buf);
1060 if (imp > CONN_MANAGER) {
a10bd924 1061 warn("Resetting link <%s>, send queue full", l_ptr->name);
4323add6 1062 tipc_link_reset(l_ptr);
b97bf3fd
PL		 1063 }
1064 return dsz;
1065 }
1066
1067 /* Fragmentation needed ? */
1068
1069 if (size > max_packet)
4323add6 1070 return tipc_link_send_long_buf(l_ptr, buf);
b97bf3fd
PL		 1071
1072 /* Packet can be queued or sent: */
1073
1074 if (queue_size > l_ptr->stats.max_queue_sz)
1075 l_ptr->stats.max_queue_sz = queue_size;
1076
4323add6 1077 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
b97bf3fd
PL		 1078 !link_congested(l_ptr))) {
1079 link_add_to_outqueue(l_ptr, buf, msg);
1080
4323add6 1081 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
b97bf3fd
PL		 1082 l_ptr->unacked_window = 0;
1083 } else {
4323add6 1084 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1085 l_ptr->stats.bearer_congs++;
1086 l_ptr->next_out = buf;
1087 }
1088 return dsz;
1089 }
1090 /* Congestion: can message be bundled ?: */
1091
1092 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1093 (msg_user(msg) != MSG_FRAGMENTER)) {
1094
1095 /* Try adding message to an existing bundle */
1096
1097 if (l_ptr->next_out &&
1098 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
4323add6 1099 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1100 return dsz;
1101 }
1102
1103 /* Try creating a new bundle */
1104
1105 if (size <= max_packet * 2 / 3) {
1106 struct sk_buff *bundler = buf_acquire(max_packet);
1107 struct tipc_msg bundler_hdr;
1108
1109 if (bundler) {
1110 msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1111 TIPC_OK, INT_H_SIZE, l_ptr->addr);
1112 memcpy(bundler->data, (unchar *)&bundler_hdr,
1113 INT_H_SIZE);
1114 skb_trim(bundler, INT_H_SIZE);
1115 link_bundle_buf(l_ptr, bundler, buf);
1116 buf = bundler;
1117 msg = buf_msg(buf);
1118 l_ptr->stats.sent_bundles++;
1119 }
1120 }
1121 }
1122 if (!l_ptr->next_out)
1123 l_ptr->next_out = buf;
1124 link_add_to_outqueue(l_ptr, buf, msg);
4323add6 1125 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1126 return dsz;
1127}
1128
1129/*
4323add6 1130 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
b97bf3fd
PL		 1131 * not been selected yet, and the the owner node is not locked
1132 * Called by TIPC internal users, e.g. the name distributor
1133 */
1134
4323add6 1135int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
b97bf3fd
PL		 1136{
1137 struct link *l_ptr;
1138 struct node *n_ptr;
1139 int res = -ELINKCONG;
1140
4323add6
PL		 1141 read_lock_bh(&tipc_net_lock);
1142 n_ptr = tipc_node_select(dest, selector);
b97bf3fd 1143 if (n_ptr) {
4323add6 1144 tipc_node_lock(n_ptr);
b97bf3fd 1145 l_ptr = n_ptr->active_links[selector & 1];
b97bf3fd 1146 if (l_ptr) {
c33d53b2 1147 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
4323add6 1148 res = tipc_link_send_buf(l_ptr, buf);
c33d53b2
AS		 1149 } else {
1150 dbg("Attempt to send msg to unreachable node:\n");
1151 msg_dbg(buf_msg(buf),">>>");
1152 buf_discard(buf);
b97bf3fd 1153 }
4323add6 1154 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1155 } else {
1156 dbg("Attempt to send msg to unknown node:\n");
1157 msg_dbg(buf_msg(buf),">>>");
1158 buf_discard(buf);
1159 }
4323add6 1160 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1161 return res;
1162}
1163
1164/*
1165 * link_send_buf_fast: Entry for data messages where the
1166 * destination link is known and the header is complete,
1167 * inclusive total message length. Very time critical.
1168 * Link is locked. Returns user data length.
1169 */
1170
05790c64
SR		 1171static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1172 u32 *used_max_pkt)
b97bf3fd
PL		 1173{
1174 struct tipc_msg *msg = buf_msg(buf);
1175 int res = msg_data_sz(msg);
1176
1177 if (likely(!link_congested(l_ptr))) {
1178 if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
1179 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1180 link_add_to_outqueue(l_ptr, buf, msg);
4323add6
PL		 1181 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1182 &l_ptr->media_addr))) {
b97bf3fd
PL		 1183 l_ptr->unacked_window = 0;
1184 msg_dbg(msg,"SENT_FAST:");
1185 return res;
1186 }
1187 dbg("failed sent fast...\n");
4323add6 1188 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1189 l_ptr->stats.bearer_congs++;
1190 l_ptr->next_out = buf;
1191 return res;
1192 }
1193 }
1194 else
1195 *used_max_pkt = link_max_pkt(l_ptr);
1196 }
4323add6 1197 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
b97bf3fd
PL		 1198}
1199
1200/*
1201 * tipc_send_buf_fast: Entry for data messages where the
1202 * destination node is known and the header is complete,
1203 * inclusive total message length.
1204 * Returns user data length.
1205 */
1206int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1207{
1208 struct link *l_ptr;
1209 struct node *n_ptr;
1210 int res;
1211 u32 selector = msg_origport(buf_msg(buf)) & 1;
1212 u32 dummy;
1213
1214 if (destnode == tipc_own_addr)
4323add6 1215 return tipc_port_recv_msg(buf);
b97bf3fd 1216
4323add6
PL		 1217 read_lock_bh(&tipc_net_lock);
1218 n_ptr = tipc_node_select(destnode, selector);
b97bf3fd 1219 if (likely(n_ptr)) {
4323add6 1220 tipc_node_lock(n_ptr);
b97bf3fd
PL		 1221 l_ptr = n_ptr->active_links[selector];
1222 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1223 buf, l_ptr, destnode);
1224 if (likely(l_ptr)) {
1225 res = link_send_buf_fast(l_ptr, buf, &dummy);
4323add6
PL		 1226 tipc_node_unlock(n_ptr);
1227 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1228 return res;
1229 }
4323add6 1230 tipc_node_unlock(n_ptr);
b97bf3fd 1231 }
4323add6 1232 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1233 res = msg_data_sz(buf_msg(buf));
1234 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1235 return res;
1236}
1237
1238
1239/*
4323add6 1240 * tipc_link_send_sections_fast: Entry for messages where the
b97bf3fd
PL		 1241 * destination processor is known and the header is complete,
1242 * except for total message length.
1243 * Returns user data length or errno.
1244 */
4323add6
PL		 1245int tipc_link_send_sections_fast(struct port *sender,
1246 struct iovec const *msg_sect,
1247 const u32 num_sect,
1248 u32 destaddr)
b97bf3fd
PL		 1249{
1250 struct tipc_msg *hdr = &sender->publ.phdr;
1251 struct link *l_ptr;
1252 struct sk_buff *buf;
1253 struct node *node;
1254 int res;
1255 u32 selector = msg_origport(hdr) & 1;
1256
b97bf3fd
PL		 1257again:
1258 /*
1259 * Try building message using port's max_pkt hint.
1260 * (Must not hold any locks while building message.)
1261 */
1262
1263 res = msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
1264 !sender->user_port, &buf);
1265
4323add6
PL		 1266 read_lock_bh(&tipc_net_lock);
1267 node = tipc_node_select(destaddr, selector);
b97bf3fd 1268 if (likely(node)) {
4323add6 1269 tipc_node_lock(node);
b97bf3fd
PL		 1270 l_ptr = node->active_links[selector];
1271 if (likely(l_ptr)) {
1272 if (likely(buf)) {
1273 res = link_send_buf_fast(l_ptr, buf,
1274 &sender->max_pkt);
1275 if (unlikely(res < 0))
1276 buf_discard(buf);
1277exit:
4323add6
PL		 1278 tipc_node_unlock(node);
1279 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1280 return res;
1281 }
1282
1283 /* Exit if build request was invalid */
1284
1285 if (unlikely(res < 0))
1286 goto exit;
1287
1288 /* Exit if link (or bearer) is congested */
1289
1290 if (link_congested(l_ptr) ||
1291 !list_empty(&l_ptr->b_ptr->cong_links)) {
1292 res = link_schedule_port(l_ptr,
1293 sender->publ.ref, res);
1294 goto exit;
1295 }
1296
1297 /*
1298 * Message size exceeds max_pkt hint; update hint,
1299 * then re-try fast path or fragment the message
1300 */
1301
1302 sender->max_pkt = link_max_pkt(l_ptr);
4323add6
PL		 1303 tipc_node_unlock(node);
1304 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1305
1306
1307 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
1308 goto again;
1309
1310 return link_send_sections_long(sender, msg_sect,
1311 num_sect, destaddr);
1312 }
4323add6 1313 tipc_node_unlock(node);
b97bf3fd 1314 }
4323add6 1315 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1316
1317 /* Couldn't find a link to the destination node */
1318
1319 if (buf)
1320 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1321 if (res >= 0)
4323add6
PL		 1322 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1323 TIPC_ERR_NO_NODE);
b97bf3fd
PL		 1324 return res;
1325}
1326
1327/*
1328 * link_send_sections_long(): Entry for long messages where the
1329 * destination node is known and the header is complete,
1330 * inclusive total message length.
1331 * Link and bearer congestion status have been checked to be ok,
1332 * and are ignored if they change.
1333 *
1334 * Note that fragments do not use the full link MTU so that they won't have
1335 * to undergo refragmentation if link changeover causes them to be sent
1336 * over another link with an additional tunnel header added as prefix.
1337 * (Refragmentation will still occur if the other link has a smaller MTU.)
1338 *
1339 * Returns user data length or errno.
1340 */
1341static int link_send_sections_long(struct port *sender,
1342 struct iovec const *msg_sect,
1343 u32 num_sect,
1344 u32 destaddr)
1345{
1346 struct link *l_ptr;
1347 struct node *node;
1348 struct tipc_msg *hdr = &sender->publ.phdr;
1349 u32 dsz = msg_data_sz(hdr);
1350 u32 max_pkt,fragm_sz,rest;
1351 struct tipc_msg fragm_hdr;
1352 struct sk_buff *buf,*buf_chain,*prev;
1353 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1354 const unchar *sect_crs;
1355 int curr_sect;
1356 u32 fragm_no;
1357
1358again:
1359 fragm_no = 1;
1360 max_pkt = sender->max_pkt - INT_H_SIZE;
1361 /* leave room for tunnel header in case of link changeover */
1362 fragm_sz = max_pkt - INT_H_SIZE;
1363 /* leave room for fragmentation header in each fragment */
1364 rest = dsz;
1365 fragm_crs = 0;
1366 fragm_rest = 0;
1367 sect_rest = 0;
1fc54d8f 1368 sect_crs = NULL;
b97bf3fd
PL		 1369 curr_sect = -1;
1370
1371 /* Prepare reusable fragment header: */
1372
1373 msg_dbg(hdr, ">FRAGMENTING>");
1374 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1375 TIPC_OK, INT_H_SIZE, msg_destnode(hdr));
1376 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1377 msg_set_size(&fragm_hdr, max_pkt);
1378 msg_set_fragm_no(&fragm_hdr, 1);
1379
1380 /* Prepare header of first fragment: */
1381
1382 buf_chain = buf = buf_acquire(max_pkt);
1383 if (!buf)
1384 return -ENOMEM;
1385 buf->next = NULL;
1386 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1387 hsz = msg_hdr_sz(hdr);
1388 memcpy(buf->data + INT_H_SIZE, (unchar *)hdr, hsz);
1389 msg_dbg(buf_msg(buf), ">BUILD>");
1390
1391 /* Chop up message: */
1392
1393 fragm_crs = INT_H_SIZE + hsz;
1394 fragm_rest = fragm_sz - hsz;
1395
1396 do { /* For all sections */
1397 u32 sz;
1398
1399 if (!sect_rest) {
1400 sect_rest = msg_sect[++curr_sect].iov_len;
1401 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1402 }
1403
1404 if (sect_rest < fragm_rest)
1405 sz = sect_rest;
1406 else
1407 sz = fragm_rest;
1408
1409 if (likely(!sender->user_port)) {
1410 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1411error:
1412 for (; buf_chain; buf_chain = buf) {
1413 buf = buf_chain->next;
1414 buf_discard(buf_chain);
1415 }
1416 return -EFAULT;
1417 }
1418 } else
1419 memcpy(buf->data + fragm_crs, sect_crs, sz);
1420
1421 sect_crs += sz;
1422 sect_rest -= sz;
1423 fragm_crs += sz;
1424 fragm_rest -= sz;
1425 rest -= sz;
1426
1427 if (!fragm_rest && rest) {
1428
1429 /* Initiate new fragment: */
1430 if (rest <= fragm_sz) {
1431 fragm_sz = rest;
1432 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1433 } else {
1434 msg_set_type(&fragm_hdr, FRAGMENT);
1435 }
1436 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1437 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1438 prev = buf;
1439 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1440 if (!buf)
1441 goto error;
1442
1443 buf->next = NULL;
1444 prev->next = buf;
1445 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1446 fragm_crs = INT_H_SIZE;
1447 fragm_rest = fragm_sz;
1448 msg_dbg(buf_msg(buf)," >BUILD>");
1449 }
1450 }
1451 while (rest > 0);
1452
1453 /*
1454 * Now we have a buffer chain. Select a link and check
1455 * that packet size is still OK
1456 */
4323add6 1457 node = tipc_node_select(destaddr, sender->publ.ref & 1);
b97bf3fd 1458 if (likely(node)) {
4323add6 1459 tipc_node_lock(node);
b97bf3fd
PL		 1460 l_ptr = node->active_links[sender->publ.ref & 1];
1461 if (!l_ptr) {
4323add6 1462 tipc_node_unlock(node);
b97bf3fd
PL		 1463 goto reject;
1464 }
1465 if (link_max_pkt(l_ptr) < max_pkt) {
1466 sender->max_pkt = link_max_pkt(l_ptr);
4323add6 1467 tipc_node_unlock(node);
b97bf3fd
PL		 1468 for (; buf_chain; buf_chain = buf) {
1469 buf = buf_chain->next;
1470 buf_discard(buf_chain);
1471 }
1472 goto again;
1473 }
1474 } else {
1475reject:
1476 for (; buf_chain; buf_chain = buf) {
1477 buf = buf_chain->next;
1478 buf_discard(buf_chain);
1479 }
4323add6
PL		 1480 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1481 TIPC_ERR_NO_NODE);
b97bf3fd
PL		 1482 }
1483
1484 /* Append whole chain to send queue: */
1485
1486 buf = buf_chain;
1487 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1488 if (!l_ptr->next_out)
1489 l_ptr->next_out = buf_chain;
1490 l_ptr->stats.sent_fragmented++;
1491 while (buf) {
1492 struct sk_buff *next = buf->next;
1493 struct tipc_msg *msg = buf_msg(buf);
1494
1495 l_ptr->stats.sent_fragments++;
1496 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1497 link_add_to_outqueue(l_ptr, buf, msg);
1498 msg_dbg(msg, ">ADD>");
1499 buf = next;
1500 }
1501
1502 /* Send it, if possible: */
1503
4323add6
PL		 1504 tipc_link_push_queue(l_ptr);
1505 tipc_node_unlock(node);
b97bf3fd
PL		 1506 return dsz;
1507}
1508
1509/*
4323add6 1510 * tipc_link_push_packet: Push one unsent packet to the media
b97bf3fd 1511 */
4323add6 1512u32 tipc_link_push_packet(struct link *l_ptr)
b97bf3fd
PL		 1513{
1514 struct sk_buff *buf = l_ptr->first_out;
1515 u32 r_q_size = l_ptr->retransm_queue_size;
1516 u32 r_q_head = l_ptr->retransm_queue_head;
1517
1518 /* Step to position where retransmission failed, if any, */
1519 /* consider that buffers may have been released in meantime */
1520
1521 if (r_q_size && buf) {
1522 u32 last = lesser(mod(r_q_head + r_q_size),
1523 link_last_sent(l_ptr));
1524 u32 first = msg_seqno(buf_msg(buf));
1525
1526 while (buf && less(first, r_q_head)) {
1527 first = mod(first + 1);
1528 buf = buf->next;
1529 }
1530 l_ptr->retransm_queue_head = r_q_head = first;
1531 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1532 }
1533
1534 /* Continue retransmission now, if there is anything: */
1535
1536 if (r_q_size && buf && !skb_cloned(buf)) {
1537 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1538 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
4323add6 1539 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1540 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1541 l_ptr->retransm_queue_head = mod(++r_q_head);
1542 l_ptr->retransm_queue_size = --r_q_size;
1543 l_ptr->stats.retransmitted++;
1544 return TIPC_OK;
1545 } else {
1546 l_ptr->stats.bearer_congs++;
1547 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1548 return PUSH_FAILED;
1549 }
1550 }
1551
1552 /* Send deferred protocol message, if any: */
1553
1554 buf = l_ptr->proto_msg_queue;
1555 if (buf) {
1556 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1557 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
4323add6 1558 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1559 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1560 l_ptr->unacked_window = 0;
1561 buf_discard(buf);
1fc54d8f 1562 l_ptr->proto_msg_queue = NULL;
b97bf3fd
PL		 1563 return TIPC_OK;
1564 } else {
1565 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1566 l_ptr->stats.bearer_congs++;
1567 return PUSH_FAILED;
1568 }
1569 }
1570
1571 /* Send one deferred data message, if send window not full: */
1572
1573 buf = l_ptr->next_out;
1574 if (buf) {
1575 struct tipc_msg *msg = buf_msg(buf);
1576 u32 next = msg_seqno(msg);
1577 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1578
1579 if (mod(next - first) < l_ptr->queue_limit[0]) {
1580 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1581 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
4323add6 1582 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1583 if (msg_user(msg) == MSG_BUNDLER)
1584 msg_set_type(msg, CLOSED_MSG);
1585 msg_dbg(msg, ">PUSH-DATA>");
1586 l_ptr->next_out = buf->next;
1587 return TIPC_OK;
1588 } else {
1589 msg_dbg(msg, "|PUSH-DATA|");
1590 l_ptr->stats.bearer_congs++;
1591 return PUSH_FAILED;
1592 }
1593 }
1594 }
1595 return PUSH_FINISHED;
1596}
1597
1598/*
1599 * push_queue(): push out the unsent messages of a link where
1600 * congestion has abated. Node is locked
1601 */
4323add6 1602void tipc_link_push_queue(struct link *l_ptr)
b97bf3fd
PL		 1603{
1604 u32 res;
1605
4323add6 1606 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
b97bf3fd
PL		 1607 return;
1608
1609 do {
4323add6 1610 res = tipc_link_push_packet(l_ptr);
b97bf3fd
PL		 1611 }
1612 while (res == TIPC_OK);
1613 if (res == PUSH_FAILED)
4323add6 1614 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1615}
1616
d356eeba
AS		 1617static void link_reset_all(unsigned long addr)
1618{
1619 struct node *n_ptr;
1620 char addr_string[16];
1621 u32 i;
1622
1623 read_lock_bh(&tipc_net_lock);
1624 n_ptr = tipc_node_find((u32)addr);
1625 if (!n_ptr) {
1626 read_unlock_bh(&tipc_net_lock);
1627 return; /* node no longer exists */
1628 }
1629
1630 tipc_node_lock(n_ptr);
1631
1632 warn("Resetting all links to %s\n",
1633 addr_string_fill(addr_string, n_ptr->addr));
1634
1635 for (i = 0; i < MAX_BEARERS; i++) {
1636 if (n_ptr->links[i]) {
1637 link_print(n_ptr->links[i], TIPC_OUTPUT,
1638 "Resetting link\n");
1639 tipc_link_reset(n_ptr->links[i]);
1640 }
1641 }
1642
1643 tipc_node_unlock(n_ptr);
1644 read_unlock_bh(&tipc_net_lock);
1645}
1646
1647static void link_retransmit_failure(struct link *l_ptr, struct sk_buff *buf)
1648{
1649 struct tipc_msg *msg = buf_msg(buf);
1650
1651 warn("Retransmission failure on link <%s>\n", l_ptr->name);
1652 tipc_msg_print(TIPC_OUTPUT, msg, ">RETR-FAIL>");
1653
1654 if (l_ptr->addr) {
1655
1656 /* Handle failure on standard link */
1657
1658 link_print(l_ptr, TIPC_OUTPUT, "Resetting link\n");
1659 tipc_link_reset(l_ptr);
1660
1661 } else {
1662
1663 /* Handle failure on broadcast link */
1664
1665 struct node *n_ptr;
1666 char addr_string[16];
1667
1668 tipc_printf(TIPC_OUTPUT, "Msg seq number: %u, ", msg_seqno(msg));
1669 tipc_printf(TIPC_OUTPUT, "Outstanding acks: %u\n", (u32)TIPC_SKB_CB(buf)->handle);
1670
1671 n_ptr = l_ptr->owner->next;
1672 tipc_node_lock(n_ptr);
1673
1674 addr_string_fill(addr_string, n_ptr->addr);
1675 tipc_printf(TIPC_OUTPUT, "Multicast link info for %s\n", addr_string);
1676 tipc_printf(TIPC_OUTPUT, "Supported: %d, ", n_ptr->bclink.supported);
1677 tipc_printf(TIPC_OUTPUT, "Acked: %u\n", n_ptr->bclink.acked);
1678 tipc_printf(TIPC_OUTPUT, "Last in: %u, ", n_ptr->bclink.last_in);
1679 tipc_printf(TIPC_OUTPUT, "Gap after: %u, ", n_ptr->bclink.gap_after);
1680 tipc_printf(TIPC_OUTPUT, "Gap to: %u\n", n_ptr->bclink.gap_to);
1681 tipc_printf(TIPC_OUTPUT, "Nack sync: %u\n\n", n_ptr->bclink.nack_sync);
1682
1683 tipc_k_signal((Handler)link_reset_all, (unsigned long)n_ptr->addr);
1684
1685 tipc_node_unlock(n_ptr);
1686
1687 l_ptr->stale_count = 0;
1688 }
1689}
1690
4323add6
PL		 1691void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1692 u32 retransmits)
b97bf3fd
PL		 1693{
1694 struct tipc_msg *msg;
1695
d356eeba
AS		 1696 if (!buf)
1697 return;
1698
1699 msg = buf_msg(buf);
1700
b97bf3fd
PL		 1701 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1702
d356eeba
AS		 1703 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
1704 if (!skb_cloned(buf)) {
1705 msg_dbg(msg, ">NO_RETR->BCONG>");
1706 dbg_print_link(l_ptr, " ");
1707 l_ptr->retransm_queue_head = msg_seqno(msg);
1708 l_ptr->retransm_queue_size = retransmits;
1709 return;
1710 } else {
1711 /* Don't retransmit if driver already has the buffer */
1712 }
1713 } else {
1714 /* Detect repeated retransmit failures on uncongested bearer */
1715
1716 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1717 if (++l_ptr->stale_count > 100) {
1718 link_retransmit_failure(l_ptr, buf);
1719 return;
1720 }
1721 } else {
1722 l_ptr->last_retransmitted = msg_seqno(msg);
1723 l_ptr->stale_count = 1;
1724 }
b97bf3fd 1725 }
d356eeba 1726
b97bf3fd
PL		 1727 while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
1728 msg = buf_msg(buf);
1729 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1730 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
4323add6 1731 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1732 msg_dbg(buf_msg(buf), ">RETR>");
1733 buf = buf->next;
1734 retransmits--;
1735 l_ptr->stats.retransmitted++;
1736 } else {
4323add6 1737 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1738 l_ptr->stats.bearer_congs++;
1739 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1740 l_ptr->retransm_queue_size = retransmits;
1741 return;
1742 }
1743 }
d356eeba 1744
b97bf3fd
PL		 1745 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1746}
1747
1748/*
1749 * link_recv_non_seq: Receive packets which are outside
1750 * the link sequence flow
1751 */
1752
1753static void link_recv_non_seq(struct sk_buff *buf)
1754{
1755 struct tipc_msg *msg = buf_msg(buf);
1756
1757 if (msg_user(msg) == LINK_CONFIG)
4323add6 1758 tipc_disc_recv_msg(buf);
b97bf3fd 1759 else
4323add6 1760 tipc_bclink_recv_pkt(buf);
b97bf3fd
PL		 1761}
1762
1763/**
1764 * link_insert_deferred_queue - insert deferred messages back into receive chain
1765 */
1766
1767static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1768 struct sk_buff *buf)
1769{
1770 u32 seq_no;
1771
1772 if (l_ptr->oldest_deferred_in == NULL)
1773 return buf;
1774
1775 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1776 if (seq_no == mod(l_ptr->next_in_no)) {
1777 l_ptr->newest_deferred_in->next = buf;
1778 buf = l_ptr->oldest_deferred_in;
1779 l_ptr->oldest_deferred_in = NULL;
1780 l_ptr->deferred_inqueue_sz = 0;
1781 }
1782 return buf;
1783}
1784
1785void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1786{
4323add6 1787 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 1788 while (head) {
1789 struct bearer *b_ptr;
1790 struct node *n_ptr;
1791 struct link *l_ptr;
1792 struct sk_buff *crs;
1793 struct sk_buff *buf = head;
1794 struct tipc_msg *msg = buf_msg(buf);
1795 u32 seq_no = msg_seqno(msg);
1796 u32 ackd = msg_ack(msg);
1797 u32 released = 0;
1798 int type;
1799
1800 b_ptr = (struct bearer *)tb_ptr;
1801 TIPC_SKB_CB(buf)->handle = b_ptr;
1802
1803 head = head->next;
1804 if (unlikely(msg_version(msg) != TIPC_VERSION))
1805 goto cont;
1806#if 0
1807 if (msg_user(msg) != LINK_PROTOCOL)
1808#endif
1809 msg_dbg(msg,"<REC<");
1810
1811 if (unlikely(msg_non_seq(msg))) {
1812 link_recv_non_seq(buf);
1813 continue;
1814 }
26008247
AS		 1815
1816 if (unlikely(!msg_short(msg) &&
1817 (msg_destnode(msg) != tipc_own_addr)))
1818 goto cont;
1819
4323add6 1820 n_ptr = tipc_node_find(msg_prevnode(msg));
b97bf3fd
PL		 1821 if (unlikely(!n_ptr))
1822 goto cont;
1823
4323add6 1824 tipc_node_lock(n_ptr);
b97bf3fd
PL		 1825 l_ptr = n_ptr->links[b_ptr->identity];
1826 if (unlikely(!l_ptr)) {
4323add6 1827 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1828 goto cont;
1829 }
1830 /*
1831 * Release acked messages
1832 */
1833 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
4323add6
PL		 1834 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1835 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
b97bf3fd
PL		 1836 }
1837
1838 crs = l_ptr->first_out;
1839 while ((crs != l_ptr->next_out) &&
1840 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1841 struct sk_buff *next = crs->next;
1842
1843 buf_discard(crs);
1844 crs = next;
1845 released++;
1846 }
1847 if (released) {
1848 l_ptr->first_out = crs;
1849 l_ptr->out_queue_size -= released;
1850 }
1851 if (unlikely(l_ptr->next_out))
4323add6 1852 tipc_link_push_queue(l_ptr);
b97bf3fd 1853 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
4323add6 1854 tipc_link_wakeup_ports(l_ptr, 0);
b97bf3fd
PL		 1855 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1856 l_ptr->stats.sent_acks++;
4323add6 1857 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 1858 }
1859
1860protocol_check:
1861 if (likely(link_working_working(l_ptr))) {
1862 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1863 l_ptr->next_in_no++;
1864 if (unlikely(l_ptr->oldest_deferred_in))
1865 head = link_insert_deferred_queue(l_ptr,
1866 head);
1867 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1868deliver:
1869 if (likely(msg_isdata(msg))) {
4323add6
PL		 1870 tipc_node_unlock(n_ptr);
1871 tipc_port_recv_msg(buf);
b97bf3fd
PL		 1872 continue;
1873 }
1874 switch (msg_user(msg)) {
1875 case MSG_BUNDLER:
1876 l_ptr->stats.recv_bundles++;
1877 l_ptr->stats.recv_bundled +=
1878 msg_msgcnt(msg);
4323add6
PL		 1879 tipc_node_unlock(n_ptr);
1880 tipc_link_recv_bundle(buf);
b97bf3fd
PL		 1881 continue;
1882 case ROUTE_DISTRIBUTOR:
4323add6
PL		 1883 tipc_node_unlock(n_ptr);
1884 tipc_cltr_recv_routing_table(buf);
b97bf3fd
PL		 1885 continue;
1886 case NAME_DISTRIBUTOR:
4323add6
PL		 1887 tipc_node_unlock(n_ptr);
1888 tipc_named_recv(buf);
b97bf3fd
PL		 1889 continue;
1890 case CONN_MANAGER:
4323add6
PL		 1891 tipc_node_unlock(n_ptr);
1892 tipc_port_recv_proto_msg(buf);
b97bf3fd
PL		 1893 continue;
1894 case MSG_FRAGMENTER:
1895 l_ptr->stats.recv_fragments++;
4323add6
PL		 1896 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
1897 &buf, &msg)) {
b97bf3fd
PL		 1898 l_ptr->stats.recv_fragmented++;
1899 goto deliver;
1900 }
1901 break;
1902 case CHANGEOVER_PROTOCOL:
1903 type = msg_type(msg);
4323add6 1904 if (link_recv_changeover_msg(&l_ptr, &buf)) {
b97bf3fd
PL		 1905 msg = buf_msg(buf);
1906 seq_no = msg_seqno(msg);
1907 TIPC_SKB_CB(buf)->handle
1908 = b_ptr;
1909 if (type == ORIGINAL_MSG)
1910 goto deliver;
1911 goto protocol_check;
1912 }
1913 break;
1914 }
1915 }
4323add6
PL		 1916 tipc_node_unlock(n_ptr);
1917 tipc_net_route_msg(buf);
b97bf3fd
PL		 1918 continue;
1919 }
1920 link_handle_out_of_seq_msg(l_ptr, buf);
1921 head = link_insert_deferred_queue(l_ptr, head);
4323add6 1922 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1923 continue;
1924 }
1925
1926 if (msg_user(msg) == LINK_PROTOCOL) {
1927 link_recv_proto_msg(l_ptr, buf);
1928 head = link_insert_deferred_queue(l_ptr, head);
4323add6 1929 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1930 continue;
1931 }
1932 msg_dbg(msg,"NSEQ<REC<");
1933 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1934
1935 if (link_working_working(l_ptr)) {
1936 /* Re-insert in front of queue */
1937 msg_dbg(msg,"RECV-REINS:");
1938 buf->next = head;
1939 head = buf;
4323add6 1940 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1941 continue;
1942 }
4323add6 1943 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1944cont:
1945 buf_discard(buf);
1946 }
4323add6 1947 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1948}
1949
1950/*
1951 * link_defer_buf(): Sort a received out-of-sequence packet
1952 * into the deferred reception queue.
1953 * Returns the increase of the queue length,i.e. 0 or 1
1954 */
1955
4323add6
PL		 1956u32 tipc_link_defer_pkt(struct sk_buff **head,
1957 struct sk_buff **tail,
1958 struct sk_buff *buf)
b97bf3fd 1959{
1fc54d8f 1960 struct sk_buff *prev = NULL;
b97bf3fd
PL		 1961 struct sk_buff *crs = *head;
1962 u32 seq_no = msg_seqno(buf_msg(buf));
1963
1964 buf->next = NULL;
1965
1966 /* Empty queue ? */
1967 if (*head == NULL) {
1968 *head = *tail = buf;
1969 return 1;
1970 }
1971
1972 /* Last ? */
1973 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1974 (*tail)->next = buf;
1975 *tail = buf;
1976 return 1;
1977 }
1978
1979 /* Scan through queue and sort it in */
1980 do {
1981 struct tipc_msg *msg = buf_msg(crs);
1982
1983 if (less(seq_no, msg_seqno(msg))) {
1984 buf->next = crs;
1985 if (prev)
1986 prev->next = buf;
1987 else
1988 *head = buf;
1989 return 1;
1990 }
1991 if (seq_no == msg_seqno(msg)) {
1992 break;
1993 }
1994 prev = crs;
1995 crs = crs->next;
1996 }
1997 while (crs);
1998
1999 /* Message is a duplicate of an existing message */
2000
2001 buf_discard(buf);
2002 return 0;
2003}
2004
2005/**
2006 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
2007 */
2008
2009static void link_handle_out_of_seq_msg(struct link *l_ptr,
2010 struct sk_buff *buf)
2011{
2012 u32 seq_no = msg_seqno(buf_msg(buf));
2013
2014 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
2015 link_recv_proto_msg(l_ptr, buf);
2016 return;
2017 }
2018
2019 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
2020 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
2021
2022 /* Record OOS packet arrival (force mismatch on next timeout) */
2023
2024 l_ptr->checkpoint--;
2025
2026 /*
2027 * Discard packet if a duplicate; otherwise add it to deferred queue
2028 * and notify peer of gap as per protocol specification
2029 */
2030
2031 if (less(seq_no, mod(l_ptr->next_in_no))) {
2032 l_ptr->stats.duplicates++;
2033 buf_discard(buf);
2034 return;
2035 }
2036
4323add6
PL		 2037 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
2038 &l_ptr->newest_deferred_in, buf)) {
b97bf3fd
PL		 2039 l_ptr->deferred_inqueue_sz++;
2040 l_ptr->stats.deferred_recv++;
2041 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
4323add6 2042 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 2043 } else
2044 l_ptr->stats.duplicates++;
2045}
2046
2047/*
2048 * Send protocol message to the other endpoint.
2049 */
4323add6
PL		 2050void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
2051 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
b97bf3fd 2052{
1fc54d8f 2053 struct sk_buff *buf = NULL;
b97bf3fd
PL		 2054 struct tipc_msg *msg = l_ptr->pmsg;
2055 u32 msg_size = sizeof(l_ptr->proto_msg);
2056
2057 if (link_blocked(l_ptr))
2058 return;
2059 msg_set_type(msg, msg_typ);
2060 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
2061 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
4323add6 2062 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
b97bf3fd
PL		 2063
2064 if (msg_typ == STATE_MSG) {
2065 u32 next_sent = mod(l_ptr->next_out_no);
2066
4323add6 2067 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2068 return;
2069 if (l_ptr->next_out)
2070 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
2071 msg_set_next_sent(msg, next_sent);
2072 if (l_ptr->oldest_deferred_in) {
2073 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
2074 gap = mod(rec - mod(l_ptr->next_in_no));
2075 }
2076 msg_set_seq_gap(msg, gap);
2077 if (gap)
2078 l_ptr->stats.sent_nacks++;
2079 msg_set_link_tolerance(msg, tolerance);
2080 msg_set_linkprio(msg, priority);
2081 msg_set_max_pkt(msg, ack_mtu);
2082 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
2083 msg_set_probe(msg, probe_msg != 0);
2084 if (probe_msg) {
2085 u32 mtu = l_ptr->max_pkt;
2086
2087 if ((mtu < l_ptr->max_pkt_target) &&
2088 link_working_working(l_ptr) &&
2089 l_ptr->fsm_msg_cnt) {
2090 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2091 if (l_ptr->max_pkt_probes == 10) {
2092 l_ptr->max_pkt_target = (msg_size - 4);
2093 l_ptr->max_pkt_probes = 0;
2094 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2095 }
2096 l_ptr->max_pkt_probes++;
2097 }
2098
2099 l_ptr->stats.sent_probes++;
2100 }
2101 l_ptr->stats.sent_states++;
2102 } else { /* RESET_MSG or ACTIVATE_MSG */
2103 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2104 msg_set_seq_gap(msg, 0);
2105 msg_set_next_sent(msg, 1);
2106 msg_set_link_tolerance(msg, l_ptr->tolerance);
2107 msg_set_linkprio(msg, l_ptr->priority);
2108 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2109 }
2110
4323add6 2111 if (tipc_node_has_redundant_links(l_ptr->owner)) {
b97bf3fd
PL		 2112 msg_set_redundant_link(msg);
2113 } else {
2114 msg_clear_redundant_link(msg);
2115 }
2116 msg_set_linkprio(msg, l_ptr->priority);
2117
2118 /* Ensure sequence number will not fit : */
2119
2120 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2121
2122 /* Congestion? */
2123
4323add6 2124 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
b97bf3fd
PL		 2125 if (!l_ptr->proto_msg_queue) {
2126 l_ptr->proto_msg_queue =
2127 buf_acquire(sizeof(l_ptr->proto_msg));
2128 }
2129 buf = l_ptr->proto_msg_queue;
2130 if (!buf)
2131 return;
2132 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2133 return;
2134 }
2135 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2136
2137 /* Message can be sent */
2138
2139 msg_dbg(msg, ">>");
2140
2141 buf = buf_acquire(msg_size);
2142 if (!buf)
2143 return;
2144
2145 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2146 msg_set_size(buf_msg(buf), msg_size);
2147
4323add6 2148 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 2149 l_ptr->unacked_window = 0;
2150 buf_discard(buf);
2151 return;
2152 }
2153
2154 /* New congestion */
4323add6 2155 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 2156 l_ptr->proto_msg_queue = buf;
2157 l_ptr->stats.bearer_congs++;
2158}
2159
2160/*
2161 * Receive protocol message :
2162 * Note that network plane id propagates through the network, and may
2163 * change at any time. The node with lowest address rules
2164 */
2165
2166static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2167{
2168 u32 rec_gap = 0;
2169 u32 max_pkt_info;
2170 u32 max_pkt_ack;
2171 u32 msg_tol;
2172 struct tipc_msg *msg = buf_msg(buf);
2173
2174 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2175 msg_dbg(msg, "<<");
2176 if (link_blocked(l_ptr))
2177 goto exit;
2178
2179 /* record unnumbered packet arrival (force mismatch on next timeout) */
2180
2181 l_ptr->checkpoint--;
2182
2183 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2184 if (tipc_own_addr > msg_prevnode(msg))
2185 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2186
2187 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2188
2189 switch (msg_type(msg)) {
2190
2191 case RESET_MSG:
2192 if (!link_working_unknown(l_ptr) && l_ptr->peer_session) {
2193 if (msg_session(msg) == l_ptr->peer_session) {
2194 dbg("Duplicate RESET: %u<->%u\n",
2195 msg_session(msg), l_ptr->peer_session);
2196 break; /* duplicate: ignore */
2197 }
2198 }
2199 /* fall thru' */
2200 case ACTIVATE_MSG:
2201 /* Update link settings according other endpoint's values */
2202
2203 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2204
2205 if ((msg_tol = msg_link_tolerance(msg)) &&
2206 (msg_tol > l_ptr->tolerance))
2207 link_set_supervision_props(l_ptr, msg_tol);
2208
2209 if (msg_linkprio(msg) > l_ptr->priority)
2210 l_ptr->priority = msg_linkprio(msg);
2211
2212 max_pkt_info = msg_max_pkt(msg);
2213 if (max_pkt_info) {
2214 if (max_pkt_info < l_ptr->max_pkt_target)
2215 l_ptr->max_pkt_target = max_pkt_info;
2216 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2217 l_ptr->max_pkt = l_ptr->max_pkt_target;
2218 } else {
2219 l_ptr->max_pkt = l_ptr->max_pkt_target;
2220 }
2221 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2222
2223 link_state_event(l_ptr, msg_type(msg));
2224
2225 l_ptr->peer_session = msg_session(msg);
2226 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2227
2228 /* Synchronize broadcast sequence numbers */
4323add6 2229 if (!tipc_node_has_redundant_links(l_ptr->owner)) {
b97bf3fd
PL		 2230 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2231 }
2232 break;
2233 case STATE_MSG:
2234
2235 if ((msg_tol = msg_link_tolerance(msg)))
2236 link_set_supervision_props(l_ptr, msg_tol);
2237
2238 if (msg_linkprio(msg) &&
2239 (msg_linkprio(msg) != l_ptr->priority)) {
a10bd924 2240 warn("Resetting link <%s>, priority change %u->%u\n",
b97bf3fd
PL		 2241 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2242 l_ptr->priority = msg_linkprio(msg);
4323add6 2243 tipc_link_reset(l_ptr); /* Enforce change to take effect */
b97bf3fd
PL		 2244 break;
2245 }
2246 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2247 l_ptr->stats.recv_states++;
2248 if (link_reset_unknown(l_ptr))
2249 break;
2250
2251 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2252 rec_gap = mod(msg_next_sent(msg) -
2253 mod(l_ptr->next_in_no));
2254 }
2255
2256 max_pkt_ack = msg_max_pkt(msg);
2257 if (max_pkt_ack > l_ptr->max_pkt) {
2258 dbg("Link <%s> updated MTU %u -> %u\n",
2259 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2260 l_ptr->max_pkt = max_pkt_ack;
2261 l_ptr->max_pkt_probes = 0;
2262 }
2263
2264 max_pkt_ack = 0;
2265 if (msg_probe(msg)) {
2266 l_ptr->stats.recv_probes++;
2267 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2268 max_pkt_ack = msg_size(msg);
2269 }
2270 }
2271
2272 /* Protocol message before retransmits, reduce loss risk */
2273
4323add6 2274 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
b97bf3fd
PL		 2275
2276 if (rec_gap || (msg_probe(msg))) {
4323add6
PL		 2277 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2278 0, rec_gap, 0, 0, max_pkt_ack);
b97bf3fd
PL		 2279 }
2280 if (msg_seq_gap(msg)) {
2281 msg_dbg(msg, "With Gap:");
2282 l_ptr->stats.recv_nacks++;
4323add6
PL		 2283 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2284 msg_seq_gap(msg));
b97bf3fd
PL		 2285 }
2286 break;
2287 default:
2288 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2289 }
2290exit:
2291 buf_discard(buf);
2292}
2293
2294
2295/*
4323add6 2296 * tipc_link_tunnel(): Send one message via a link belonging to
b97bf3fd
PL		 2297 * another bearer. Owner node is locked.
2298 */
4323add6
PL		 2299void tipc_link_tunnel(struct link *l_ptr,
2300 struct tipc_msg *tunnel_hdr,
2301 struct tipc_msg *msg,
2302 u32 selector)
b97bf3fd
PL		 2303{
2304 struct link *tunnel;
2305 struct sk_buff *buf;
2306 u32 length = msg_size(msg);
2307
2308 tunnel = l_ptr->owner->active_links[selector & 1];
5392d646
AS		 2309 if (!tipc_link_is_up(tunnel)) {
2310 warn("Link changeover error, "
2311 "tunnel link no longer available\n");
b97bf3fd 2312 return;
5392d646 2313 }
b97bf3fd
PL		 2314 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2315 buf = buf_acquire(length + INT_H_SIZE);
5392d646
AS		 2316 if (!buf) {
2317 warn("Link changeover error, "
2318 "unable to send tunnel msg\n");
b97bf3fd 2319 return;
5392d646 2320 }
b97bf3fd
PL		 2321 memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
2322 memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
2323 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2324 msg_dbg(buf_msg(buf), ">SEND>");
4323add6 2325 tipc_link_send_buf(tunnel, buf);
b97bf3fd
PL		 2326}
2327
2328
2329
2330/*
2331 * changeover(): Send whole message queue via the remaining link
2332 * Owner node is locked.
2333 */
2334
4323add6 2335void tipc_link_changeover(struct link *l_ptr)
b97bf3fd
PL		 2336{
2337 u32 msgcount = l_ptr->out_queue_size;
2338 struct sk_buff *crs = l_ptr->first_out;
2339 struct link *tunnel = l_ptr->owner->active_links[0];
b97bf3fd 2340 struct tipc_msg tunnel_hdr;
5392d646 2341 int split_bundles;
b97bf3fd
PL		 2342
2343 if (!tunnel)
2344 return;
2345
5392d646
AS		 2346 if (!l_ptr->owner->permit_changeover) {
2347 warn("Link changeover error, "
2348 "peer did not permit changeover\n");
b97bf3fd 2349 return;
5392d646 2350 }
b97bf3fd
PL		 2351
2352 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2353 ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2354 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2355 msg_set_msgcnt(&tunnel_hdr, msgcount);
5392d646 2356 dbg("Link changeover requires %u tunnel messages\n", msgcount);
f131072c 2357
b97bf3fd
PL		 2358 if (!l_ptr->first_out) {
2359 struct sk_buff *buf;
2360
b97bf3fd
PL		 2361 buf = buf_acquire(INT_H_SIZE);
2362 if (buf) {
2363 memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2364 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2365 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2366 tunnel->b_ptr->net_plane);
2367 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
4323add6 2368 tipc_link_send_buf(tunnel, buf);
b97bf3fd 2369 } else {
a10bd924
AS		 2370 warn("Link changeover error, "
2371 "unable to send changeover msg\n");
b97bf3fd
PL		 2372 }
2373 return;
2374 }
f131072c 2375
5392d646
AS		 2376 split_bundles = (l_ptr->owner->active_links[0] !=
2377 l_ptr->owner->active_links[1]);
2378
b97bf3fd
PL		 2379 while (crs) {
2380 struct tipc_msg *msg = buf_msg(crs);
2381
2382 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2383 u32 msgcount = msg_msgcnt(msg);
2384 struct tipc_msg *m = msg_get_wrapped(msg);
2385 unchar* pos = (unchar*)m;
2386
2387 while (msgcount--) {
2388 msg_set_seqno(m,msg_seqno(msg));
4323add6
PL		 2389 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2390 msg_link_selector(m));
b97bf3fd
PL		 2391 pos += align(msg_size(m));
2392 m = (struct tipc_msg *)pos;
2393 }
2394 } else {
4323add6
PL		 2395 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2396 msg_link_selector(msg));
b97bf3fd
PL		 2397 }
2398 crs = crs->next;
2399 }
2400}
2401
4323add6 2402void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
b97bf3fd
PL		 2403{
2404 struct sk_buff *iter;
2405 struct tipc_msg tunnel_hdr;
2406
2407 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2408 DUPLICATE_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2409 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2410 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2411 iter = l_ptr->first_out;
2412 while (iter) {
2413 struct sk_buff *outbuf;
2414 struct tipc_msg *msg = buf_msg(iter);
2415 u32 length = msg_size(msg);
2416
2417 if (msg_user(msg) == MSG_BUNDLER)
2418 msg_set_type(msg, CLOSED_MSG);
2419 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2420 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2421 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2422 outbuf = buf_acquire(length + INT_H_SIZE);
2423 if (outbuf == NULL) {
a10bd924
AS		 2424 warn("Link changeover error, "
2425 "unable to send duplicate msg\n");
b97bf3fd
PL		 2426 return;
2427 }
2428 memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2429 memcpy(outbuf->data + INT_H_SIZE, iter->data, length);
2430 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2431 tunnel->b_ptr->net_plane);
2432 msg_dbg(buf_msg(outbuf), ">SEND>");
4323add6
PL		 2433 tipc_link_send_buf(tunnel, outbuf);
2434 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2435 return;
2436 iter = iter->next;
2437 }
2438}
2439
2440
2441
2442/**
2443 * buf_extract - extracts embedded TIPC message from another message
2444 * @skb: encapsulating message buffer
2445 * @from_pos: offset to extract from
2446 *
2447 * Returns a new message buffer containing an embedded message. The
2448 * encapsulating message itself is left unchanged.
2449 */
2450
2451static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2452{
2453 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2454 u32 size = msg_size(msg);
2455 struct sk_buff *eb;
2456
2457 eb = buf_acquire(size);
2458 if (eb)
2459 memcpy(eb->data, (unchar *)msg, size);
2460 return eb;
2461}
2462
2463/*
2464 * link_recv_changeover_msg(): Receive tunneled packet sent
2465 * via other link. Node is locked. Return extracted buffer.
2466 */
2467
2468static int link_recv_changeover_msg(struct link **l_ptr,
2469 struct sk_buff **buf)
2470{
2471 struct sk_buff *tunnel_buf = *buf;
2472 struct link *dest_link;
2473 struct tipc_msg *msg;
2474 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2475 u32 msg_typ = msg_type(tunnel_msg);
2476 u32 msg_count = msg_msgcnt(tunnel_msg);
2477
2478 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
b97bf3fd
PL		 2479 if (!dest_link) {
2480 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2481 goto exit;
2482 }
f131072c
AS		 2483 if (dest_link == *l_ptr) {
2484 err("Unexpected changeover message on link <%s>\n",
2485 (*l_ptr)->name);
2486 goto exit;
2487 }
b97bf3fd
PL		 2488 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2489 (*l_ptr)->b_ptr->net_plane);
2490 *l_ptr = dest_link;
2491 msg = msg_get_wrapped(tunnel_msg);
2492
2493 if (msg_typ == DUPLICATE_MSG) {
2494 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2495 msg_dbg(tunnel_msg, "DROP/<REC<");
2496 goto exit;
2497 }
2498 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2499 if (*buf == NULL) {
a10bd924 2500 warn("Link changeover error, duplicate msg dropped\n");
b97bf3fd
PL		 2501 goto exit;
2502 }
2503 msg_dbg(tunnel_msg, "TNL<REC<");
2504 buf_discard(tunnel_buf);
2505 return 1;
2506 }
2507
2508 /* First original message ?: */
2509
4323add6 2510 if (tipc_link_is_up(dest_link)) {
b97bf3fd 2511 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
a10bd924
AS		 2512 info("Resetting link <%s>, changeover initiated by peer\n",
2513 dest_link->name);
4323add6 2514 tipc_link_reset(dest_link);
b97bf3fd 2515 dest_link->exp_msg_count = msg_count;
5392d646 2516 dbg("Expecting %u tunnelled messages\n", msg_count);
b97bf3fd
PL		 2517 if (!msg_count)
2518 goto exit;
2519 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2520 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2521 dest_link->exp_msg_count = msg_count;
5392d646 2522 dbg("Expecting %u tunnelled messages\n", msg_count);
b97bf3fd
PL		 2523 if (!msg_count)
2524 goto exit;
2525 }
2526
2527 /* Receive original message */
2528
2529 if (dest_link->exp_msg_count == 0) {
5392d646
AS		 2530 warn("Link switchover error, "
2531 "got too many tunnelled messages\n");
b97bf3fd
PL		 2532 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2533 dbg_print_link(dest_link, "LINK:");
2534 goto exit;
2535 }
2536 dest_link->exp_msg_count--;
2537 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2538 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2539 goto exit;
2540 } else {
2541 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2542 if (*buf != NULL) {
2543 msg_dbg(tunnel_msg, "TNL<REC<");
2544 buf_discard(tunnel_buf);
2545 return 1;
2546 } else {
a10bd924 2547 warn("Link changeover error, original msg dropped\n");
b97bf3fd
PL		 2548 }
2549 }
2550exit:
1fc54d8f 2551 *buf = NULL;
b97bf3fd
PL		 2552 buf_discard(tunnel_buf);
2553 return 0;
2554}
2555
2556/*
2557 * Bundler functionality:
2558 */
4323add6 2559void tipc_link_recv_bundle(struct sk_buff *buf)
b97bf3fd
PL		 2560{
2561 u32 msgcount = msg_msgcnt(buf_msg(buf));
2562 u32 pos = INT_H_SIZE;
2563 struct sk_buff *obuf;
2564
2565 msg_dbg(buf_msg(buf), "<BNDL<: ");
2566 while (msgcount--) {
2567 obuf = buf_extract(buf, pos);
2568 if (obuf == NULL) {
a10bd924
AS		 2569 warn("Link unable to unbundle message(s)\n");
2570 break;
b97bf3fd
PL		 2571 };
2572 pos += align(msg_size(buf_msg(obuf)));
2573 msg_dbg(buf_msg(obuf), " /");
4323add6 2574 tipc_net_route_msg(obuf);
b97bf3fd
PL		 2575 }
2576 buf_discard(buf);
2577}
2578
2579/*
2580 * Fragmentation/defragmentation:
2581 */
2582
2583
2584/*
4323add6 2585 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
b97bf3fd
PL		 2586 * The buffer is complete, inclusive total message length.
2587 * Returns user data length.
2588 */
4323add6 2589int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
b97bf3fd
PL		 2590{
2591 struct tipc_msg *inmsg = buf_msg(buf);
2592 struct tipc_msg fragm_hdr;
2593 u32 insize = msg_size(inmsg);
2594 u32 dsz = msg_data_sz(inmsg);
2595 unchar *crs = buf->data;
2596 u32 rest = insize;
2597 u32 pack_sz = link_max_pkt(l_ptr);
2598 u32 fragm_sz = pack_sz - INT_H_SIZE;
2599 u32 fragm_no = 1;
2600 u32 destaddr = msg_destnode(inmsg);
2601
2602 if (msg_short(inmsg))
2603 destaddr = l_ptr->addr;
2604
2605 if (msg_routed(inmsg))
2606 msg_set_prevnode(inmsg, tipc_own_addr);
2607
2608 /* Prepare reusable fragment header: */
2609
2610 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2611 TIPC_OK, INT_H_SIZE, destaddr);
2612 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2613 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2614 msg_set_fragm_no(&fragm_hdr, fragm_no);
2615 l_ptr->stats.sent_fragmented++;
2616
2617 /* Chop up message: */
2618
2619 while (rest > 0) {
2620 struct sk_buff *fragm;
2621
2622 if (rest <= fragm_sz) {
2623 fragm_sz = rest;
2624 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2625 }
2626 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2627 if (fragm == NULL) {
a10bd924 2628 warn("Link unable to fragment message\n");
b97bf3fd
PL		 2629 dsz = -ENOMEM;
2630 goto exit;
2631 }
2632 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2633 memcpy(fragm->data, (unchar *)&fragm_hdr, INT_H_SIZE);
2634 memcpy(fragm->data + INT_H_SIZE, crs, fragm_sz);
2635
2636 /* Send queued messages first, if any: */
2637
2638 l_ptr->stats.sent_fragments++;
4323add6
PL		 2639 tipc_link_send_buf(l_ptr, fragm);
2640 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2641 return dsz;
2642 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2643 rest -= fragm_sz;
2644 crs += fragm_sz;
2645 msg_set_type(&fragm_hdr, FRAGMENT);
2646 }
2647exit:
2648 buf_discard(buf);
2649 return dsz;
2650}
2651
2652/*
2653 * A pending message being re-assembled must store certain values
2654 * to handle subsequent fragments correctly. The following functions
2655 * help storing these values in unused, available fields in the
2656 * pending message. This makes dynamic memory allocation unecessary.
2657 */
2658
05790c64 2659static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
b97bf3fd
PL		 2660{
2661 msg_set_seqno(buf_msg(buf), seqno);
2662}
2663
05790c64 2664static u32 get_fragm_size(struct sk_buff *buf)
b97bf3fd
PL		 2665{
2666 return msg_ack(buf_msg(buf));
2667}
2668
05790c64 2669static void set_fragm_size(struct sk_buff *buf, u32 sz)
b97bf3fd
PL		 2670{
2671 msg_set_ack(buf_msg(buf), sz);
2672}
2673
05790c64 2674static u32 get_expected_frags(struct sk_buff *buf)
b97bf3fd
PL		 2675{
2676 return msg_bcast_ack(buf_msg(buf));
2677}
2678
05790c64 2679static void set_expected_frags(struct sk_buff *buf, u32 exp)
b97bf3fd
PL		 2680{
2681 msg_set_bcast_ack(buf_msg(buf), exp);
2682}
2683
05790c64 2684static u32 get_timer_cnt(struct sk_buff *buf)
b97bf3fd
PL		 2685{
2686 return msg_reroute_cnt(buf_msg(buf));
2687}
2688
05790c64 2689static void incr_timer_cnt(struct sk_buff *buf)
b97bf3fd
PL		 2690{
2691 msg_incr_reroute_cnt(buf_msg(buf));
2692}
2693
2694/*
4323add6 2695 * tipc_link_recv_fragment(): Called with node lock on. Returns
b97bf3fd
PL		 2696 * the reassembled buffer if message is complete.
2697 */
4323add6
PL		 2698int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2699 struct tipc_msg **m)
b97bf3fd 2700{
1fc54d8f 2701 struct sk_buff *prev = NULL;
b97bf3fd
PL		 2702 struct sk_buff *fbuf = *fb;
2703 struct tipc_msg *fragm = buf_msg(fbuf);
2704 struct sk_buff *pbuf = *pending;
2705 u32 long_msg_seq_no = msg_long_msgno(fragm);
2706
1fc54d8f 2707 *fb = NULL;
b97bf3fd
PL		 2708 msg_dbg(fragm,"FRG<REC<");
2709
2710 /* Is there an incomplete message waiting for this fragment? */
2711
2712 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no)
2713 || (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2714 prev = pbuf;
2715 pbuf = pbuf->next;
2716 }
2717
2718 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2719 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2720 u32 msg_sz = msg_size(imsg);
2721 u32 fragm_sz = msg_data_sz(fragm);
2722 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2723 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2724 if (msg_type(imsg) == TIPC_MCAST_MSG)
2725 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2726 if (msg_size(imsg) > max) {
2727 msg_dbg(fragm,"<REC<Oversized: ");
2728 buf_discard(fbuf);
2729 return 0;
2730 }
2731 pbuf = buf_acquire(msg_size(imsg));
2732 if (pbuf != NULL) {
2733 pbuf->next = *pending;
2734 *pending = pbuf;
2735 memcpy(pbuf->data, (unchar *)imsg, msg_data_sz(fragm));
2736
2737 /* Prepare buffer for subsequent fragments. */
2738
2739 set_long_msg_seqno(pbuf, long_msg_seq_no);
2740 set_fragm_size(pbuf,fragm_sz);
2741 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2742 } else {
a10bd924 2743 warn("Link unable to reassemble fragmented message\n");
b97bf3fd
PL		 2744 }
2745 buf_discard(fbuf);
2746 return 0;
2747 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2748 u32 dsz = msg_data_sz(fragm);
2749 u32 fsz = get_fragm_size(pbuf);
2750 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2751 u32 exp_frags = get_expected_frags(pbuf) - 1;
2752 memcpy(pbuf->data + crs, msg_data(fragm), dsz);
2753 buf_discard(fbuf);
2754
2755 /* Is message complete? */
2756
2757 if (exp_frags == 0) {
2758 if (prev)
2759 prev->next = pbuf->next;
2760 else
2761 *pending = pbuf->next;
2762 msg_reset_reroute_cnt(buf_msg(pbuf));
2763 *fb = pbuf;
2764 *m = buf_msg(pbuf);
2765 return 1;
2766 }
2767 set_expected_frags(pbuf,exp_frags);
2768 return 0;
2769 }
2770 dbg(" Discarding orphan fragment %x\n",fbuf);
2771 msg_dbg(fragm,"ORPHAN:");
2772 dbg("Pending long buffers:\n");
2773 dbg_print_buf_chain(*pending);
2774 buf_discard(fbuf);
2775 return 0;
2776}
2777
2778/**
2779 * link_check_defragm_bufs - flush stale incoming message fragments
2780 * @l_ptr: pointer to link
2781 */
2782
2783static void link_check_defragm_bufs(struct link *l_ptr)
2784{
1fc54d8f
SR		 2785 struct sk_buff *prev = NULL;
2786 struct sk_buff *next = NULL;
b97bf3fd
PL		 2787 struct sk_buff *buf = l_ptr->defragm_buf;
2788
2789 if (!buf)
2790 return;
2791 if (!link_working_working(l_ptr))
2792 return;
2793 while (buf) {
2794 u32 cnt = get_timer_cnt(buf);
2795
2796 next = buf->next;
2797 if (cnt < 4) {
2798 incr_timer_cnt(buf);
2799 prev = buf;
2800 } else {
2801 dbg(" Discarding incomplete long buffer\n");
2802 msg_dbg(buf_msg(buf), "LONG:");
2803 dbg_print_link(l_ptr, "curr:");
2804 dbg("Pending long buffers:\n");
2805 dbg_print_buf_chain(l_ptr->defragm_buf);
2806 if (prev)
2807 prev->next = buf->next;
2808 else
2809 l_ptr->defragm_buf = buf->next;
2810 buf_discard(buf);
2811 }
2812 buf = next;
2813 }
2814}
2815
2816
2817
2818static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2819{
2820 l_ptr->tolerance = tolerance;
2821 l_ptr->continuity_interval =
2822 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2823 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2824}
2825
2826
4323add6 2827void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
b97bf3fd
PL		 2828{
2829 /* Data messages from this node, inclusive FIRST_FRAGM */
2830 l_ptr->queue_limit[DATA_LOW] = window;
2831 l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
2832 l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
2833 l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
2834 /* Transiting data messages,inclusive FIRST_FRAGM */
2835 l_ptr->queue_limit[DATA_LOW + 4] = 300;
2836 l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
2837 l_ptr->queue_limit[DATA_HIGH + 4] = 900;
2838 l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
2839 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2840 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2841 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2842 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2843 /* FRAGMENT and LAST_FRAGMENT packets */
2844 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2845}
2846
2847/**
2848 * link_find_link - locate link by name
2849 * @name - ptr to link name string
2850 * @node - ptr to area to be filled with ptr to associated node
2851 *
4323add6 2852 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
b97bf3fd
PL		 2853 * this also prevents link deletion.
2854 *
2855 * Returns pointer to link (or 0 if invalid link name).
2856 */
2857
2858static struct link *link_find_link(const char *name, struct node **node)
2859{
2860 struct link_name link_name_parts;
2861 struct bearer *b_ptr;
2862 struct link *l_ptr;
2863
2864 if (!link_name_validate(name, &link_name_parts))
1fc54d8f 2865 return NULL;
b97bf3fd 2866
4323add6 2867 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
b97bf3fd 2868 if (!b_ptr)
1fc54d8f 2869 return NULL;
b97bf3fd 2870
4323add6 2871 *node = tipc_node_find(link_name_parts.addr_peer);
b97bf3fd 2872 if (!*node)
1fc54d8f 2873 return NULL;
b97bf3fd
PL		 2874
2875 l_ptr = (*node)->links[b_ptr->identity];
2876 if (!l_ptr || strcmp(l_ptr->name, name))
1fc54d8f 2877 return NULL;
b97bf3fd
PL		 2878
2879 return l_ptr;
2880}
2881
4323add6
PL		 2882struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2883 u16 cmd)
b97bf3fd
PL		 2884{
2885 struct tipc_link_config *args;
2886 u32 new_value;
2887 struct link *l_ptr;
2888 struct node *node;
2889 int res;
2890
2891 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
4323add6 2892 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd
PL		 2893
2894 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2895 new_value = ntohl(args->value);
2896
4323add6 2897 if (!strcmp(args->name, tipc_bclink_name)) {
b97bf3fd 2898 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
4323add6
PL		 2899 (tipc_bclink_set_queue_limits(new_value) == 0))
2900 return tipc_cfg_reply_none();
2901 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2902 " (cannot change setting on broadcast link)");
b97bf3fd
PL		 2903 }
2904
4323add6 2905 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 2906 l_ptr = link_find_link(args->name, &node);
2907 if (!l_ptr) {
4323add6
PL		 2908 read_unlock_bh(&tipc_net_lock);
2909 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 2910 }
2911
4323add6 2912 tipc_node_lock(node);
b97bf3fd
PL		 2913 res = -EINVAL;
2914 switch (cmd) {
2915 case TIPC_CMD_SET_LINK_TOL:
2916 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2917 (new_value <= TIPC_MAX_LINK_TOL)) {
2918 link_set_supervision_props(l_ptr, new_value);
4323add6
PL		 2919 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2920 0, 0, new_value, 0, 0);
b97bf3fd
PL		 2921 res = TIPC_OK;
2922 }
2923 break;
2924 case TIPC_CMD_SET_LINK_PRI:
16cb4b33
PL		 2925 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2926 (new_value <= TIPC_MAX_LINK_PRI)) {
b97bf3fd 2927 l_ptr->priority = new_value;
4323add6
PL		 2928 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2929 0, 0, 0, new_value, 0);
b97bf3fd
PL		 2930 res = TIPC_OK;
2931 }
2932 break;
2933 case TIPC_CMD_SET_LINK_WINDOW:
2934 if ((new_value >= TIPC_MIN_LINK_WIN) &&
2935 (new_value <= TIPC_MAX_LINK_WIN)) {
4323add6 2936 tipc_link_set_queue_limits(l_ptr, new_value);
b97bf3fd
PL		 2937 res = TIPC_OK;
2938 }
2939 break;
2940 }
4323add6 2941 tipc_node_unlock(node);
b97bf3fd 2942
4323add6 2943 read_unlock_bh(&tipc_net_lock);
b97bf3fd 2944 if (res)
4323add6 2945 return tipc_cfg_reply_error_string("cannot change link setting");
b97bf3fd 2946
4323add6 2947 return tipc_cfg_reply_none();
b97bf3fd
PL		 2948}
2949
2950/**
2951 * link_reset_statistics - reset link statistics
2952 * @l_ptr: pointer to link
2953 */
2954
2955static void link_reset_statistics(struct link *l_ptr)
2956{
2957 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2958 l_ptr->stats.sent_info = l_ptr->next_out_no;
2959 l_ptr->stats.recv_info = l_ptr->next_in_no;
2960}
2961
4323add6 2962struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
b97bf3fd
PL		 2963{
2964 char *link_name;
2965 struct link *l_ptr;
2966 struct node *node;
2967
2968 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
4323add6 2969 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd
PL		 2970
2971 link_name = (char *)TLV_DATA(req_tlv_area);
4323add6
PL		 2972 if (!strcmp(link_name, tipc_bclink_name)) {
2973 if (tipc_bclink_reset_stats())
2974 return tipc_cfg_reply_error_string("link not found");
2975 return tipc_cfg_reply_none();
b97bf3fd
PL		 2976 }
2977
4323add6 2978 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 2979 l_ptr = link_find_link(link_name, &node);
2980 if (!l_ptr) {
4323add6
PL		 2981 read_unlock_bh(&tipc_net_lock);
2982 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 2983 }
2984
4323add6 2985 tipc_node_lock(node);
b97bf3fd 2986 link_reset_statistics(l_ptr);
4323add6
PL		 2987 tipc_node_unlock(node);
2988 read_unlock_bh(&tipc_net_lock);
2989 return tipc_cfg_reply_none();
b97bf3fd
PL		 2990}
2991
2992/**
2993 * percent - convert count to a percentage of total (rounding up or down)
2994 */
2995
2996static u32 percent(u32 count, u32 total)
2997{
2998 return (count * 100 + (total / 2)) / total;
2999}
3000
3001/**
4323add6 3002 * tipc_link_stats - print link statistics
b97bf3fd
PL		 3003 * @name: link name
3004 * @buf: print buffer area
3005 * @buf_size: size of print buffer area
3006 *
3007 * Returns length of print buffer data string (or 0 if error)
3008 */
3009
4323add6 3010static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
b97bf3fd
PL		 3011{
3012 struct print_buf pb;
3013 struct link *l_ptr;
3014 struct node *node;
3015 char *status;
3016 u32 profile_total = 0;
3017
4323add6
PL		 3018 if (!strcmp(name, tipc_bclink_name))
3019 return tipc_bclink_stats(buf, buf_size);
b97bf3fd 3020
4323add6 3021 tipc_printbuf_init(&pb, buf, buf_size);
b97bf3fd 3022
4323add6 3023 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 3024 l_ptr = link_find_link(name, &node);
3025 if (!l_ptr) {
4323add6 3026 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 3027 return 0;
3028 }
4323add6 3029 tipc_node_lock(node);
b97bf3fd 3030
4323add6 3031 if (tipc_link_is_active(l_ptr))
b97bf3fd 3032 status = "ACTIVE";
4323add6 3033 else if (tipc_link_is_up(l_ptr))
b97bf3fd
PL		 3034 status = "STANDBY";
3035 else
3036 status = "DEFUNCT";
3037 tipc_printf(&pb, "Link <%s>\n"
3038 " %s MTU:%u Priority:%u Tolerance:%u ms"
3039 " Window:%u packets\n",
3040 l_ptr->name, status, link_max_pkt(l_ptr),
3041 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
3042 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
3043 l_ptr->next_in_no - l_ptr->stats.recv_info,
3044 l_ptr->stats.recv_fragments,
3045 l_ptr->stats.recv_fragmented,
3046 l_ptr->stats.recv_bundles,
3047 l_ptr->stats.recv_bundled);
3048 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
3049 l_ptr->next_out_no - l_ptr->stats.sent_info,
3050 l_ptr->stats.sent_fragments,
3051 l_ptr->stats.sent_fragmented,
3052 l_ptr->stats.sent_bundles,
3053 l_ptr->stats.sent_bundled);
3054 profile_total = l_ptr->stats.msg_length_counts;
3055 if (!profile_total)
3056 profile_total = 1;
3057 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
3058 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
3059 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
3060 l_ptr->stats.msg_length_counts,
3061 l_ptr->stats.msg_lengths_total / profile_total,
3062 percent(l_ptr->stats.msg_length_profile[0], profile_total),
3063 percent(l_ptr->stats.msg_length_profile[1], profile_total),
3064 percent(l_ptr->stats.msg_length_profile[2], profile_total),
3065 percent(l_ptr->stats.msg_length_profile[3], profile_total),
3066 percent(l_ptr->stats.msg_length_profile[4], profile_total),
3067 percent(l_ptr->stats.msg_length_profile[5], profile_total),
3068 percent(l_ptr->stats.msg_length_profile[6], profile_total));
3069 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
3070 l_ptr->stats.recv_states,
3071 l_ptr->stats.recv_probes,
3072 l_ptr->stats.recv_nacks,
3073 l_ptr->stats.deferred_recv,
3074 l_ptr->stats.duplicates);
3075 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
3076 l_ptr->stats.sent_states,
3077 l_ptr->stats.sent_probes,
3078 l_ptr->stats.sent_nacks,
3079 l_ptr->stats.sent_acks,
3080 l_ptr->stats.retransmitted);
3081 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
3082 l_ptr->stats.bearer_congs,
3083 l_ptr->stats.link_congs,
3084 l_ptr->stats.max_queue_sz,
3085 l_ptr->stats.queue_sz_counts
3086 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
3087 : 0);
3088
4323add6
PL		 3089 tipc_node_unlock(node);
3090 read_unlock_bh(&tipc_net_lock);
3091 return tipc_printbuf_validate(&pb);
b97bf3fd
PL		 3092}
3093
3094#define MAX_LINK_STATS_INFO 2000
3095
4323add6 3096struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
b97bf3fd
PL		 3097{
3098 struct sk_buff *buf;
3099 struct tlv_desc *rep_tlv;
3100 int str_len;
3101
3102 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
4323add6 3103 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd 3104
4323add6 3105 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
b97bf3fd
PL		 3106 if (!buf)
3107 return NULL;
3108
3109 rep_tlv = (struct tlv_desc *)buf->data;
3110
4323add6
PL		 3111 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
3112 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
b97bf3fd
PL		 3113 if (!str_len) {
3114 buf_discard(buf);
4323add6 3115 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 3116 }
3117
3118 skb_put(buf, TLV_SPACE(str_len));
3119 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3120
3121 return buf;
3122}
3123
3124#if 0
3125int link_control(const char *name, u32 op, u32 val)
3126{
3127 int res = -EINVAL;
3128 struct link *l_ptr;
3129 u32 bearer_id;
3130 struct node * node;
3131 u32 a;
3132
3133 a = link_name2addr(name, &bearer_id);
4323add6
PL		 3134 read_lock_bh(&tipc_net_lock);
3135 node = tipc_node_find(a);
b97bf3fd 3136 if (node) {
4323add6 3137 tipc_node_lock(node);
b97bf3fd
PL		 3138 l_ptr = node->links[bearer_id];
3139 if (l_ptr) {
3140 if (op == TIPC_REMOVE_LINK) {
3141 struct bearer *b_ptr = l_ptr->b_ptr;
3142 spin_lock_bh(&b_ptr->publ.lock);
4323add6 3143 tipc_link_delete(l_ptr);
b97bf3fd
PL		 3144 spin_unlock_bh(&b_ptr->publ.lock);
3145 }
3146 if (op == TIPC_CMD_BLOCK_LINK) {
4323add6 3147 tipc_link_reset(l_ptr);
b97bf3fd
PL		 3148 l_ptr->blocked = 1;
3149 }
3150 if (op == TIPC_CMD_UNBLOCK_LINK) {
3151 l_ptr->blocked = 0;
3152 }
3153 res = TIPC_OK;
3154 }
4323add6 3155 tipc_node_unlock(node);
b97bf3fd 3156 }
4323add6 3157 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 3158 return res;
3159}
3160#endif
3161
3162/**
4323add6 3163 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
b97bf3fd
PL		 3164 * @dest: network address of destination node
3165 * @selector: used to select from set of active links
3166 *
3167 * If no active link can be found, uses default maximum packet size.
3168 */
3169
4323add6 3170u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
b97bf3fd
PL		 3171{
3172 struct node *n_ptr;
3173 struct link *l_ptr;
3174 u32 res = MAX_PKT_DEFAULT;
3175
3176 if (dest == tipc_own_addr)
3177 return MAX_MSG_SIZE;
3178
4323add6
PL		 3179 read_lock_bh(&tipc_net_lock);
3180 n_ptr = tipc_node_select(dest, selector);
b97bf3fd 3181 if (n_ptr) {
4323add6 3182 tipc_node_lock(n_ptr);
b97bf3fd
PL		 3183 l_ptr = n_ptr->active_links[selector & 1];
3184 if (l_ptr)
3185 res = link_max_pkt(l_ptr);
4323add6 3186 tipc_node_unlock(n_ptr);
b97bf3fd 3187 }
4323add6 3188 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 3189 return res;
3190}
3191
3192#if 0
3193static void link_dump_rec_queue(struct link *l_ptr)
3194{
3195 struct sk_buff *crs;
3196
3197 if (!l_ptr->oldest_deferred_in) {
3198 info("Reception queue empty\n");
3199 return;
3200 }
3201 info("Contents of Reception queue:\n");
3202 crs = l_ptr->oldest_deferred_in;
3203 while (crs) {
3204 if (crs->data == (void *)0x0000a3a3) {
3205 info("buffer %x invalid\n", crs);
3206 return;
3207 }
3208 msg_dbg(buf_msg(crs), "In rec queue: \n");
3209 crs = crs->next;
3210 }
3211}
3212#endif
3213
3214static void link_dump_send_queue(struct link *l_ptr)
3215{
3216 if (l_ptr->next_out) {
3217 info("\nContents of unsent queue:\n");
3218 dbg_print_buf_chain(l_ptr->next_out);
3219 }
3220 info("\nContents of send queue:\n");
3221 if (l_ptr->first_out) {
3222 dbg_print_buf_chain(l_ptr->first_out);
3223 }
3224 info("Empty send queue\n");
3225}
3226
3227static void link_print(struct link *l_ptr, struct print_buf *buf,
3228 const char *str)
3229{
3230 tipc_printf(buf, str);
3231 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3232 return;
3233 tipc_printf(buf, "Link %x<%s>:",
3234 l_ptr->addr, l_ptr->b_ptr->publ.name);
3235 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3236 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3237 tipc_printf(buf, "SQUE");
3238 if (l_ptr->first_out) {
3239 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3240 if (l_ptr->next_out)
3241 tipc_printf(buf, "%u..",
3242 msg_seqno(buf_msg(l_ptr->next_out)));
3243 tipc_printf(buf, "%u]",
3244 msg_seqno(buf_msg
3245 (l_ptr->last_out)), l_ptr->out_queue_size);
3246 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3247 msg_seqno(buf_msg(l_ptr->first_out)))
3248 != (l_ptr->out_queue_size - 1))
3249 || (l_ptr->last_out->next != 0)) {
3250 tipc_printf(buf, "\nSend queue inconsistency\n");
3251 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3252 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3253 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3254 link_dump_send_queue(l_ptr);
3255 }
3256 } else
3257 tipc_printf(buf, "[]");
3258 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3259 if (l_ptr->oldest_deferred_in) {
3260 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3261 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3262 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3263 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3264 tipc_printf(buf, ":RQSIZ(%u)",
3265 l_ptr->deferred_inqueue_sz);
3266 }
3267 }
3268 if (link_working_unknown(l_ptr))
3269 tipc_printf(buf, ":WU");
3270 if (link_reset_reset(l_ptr))
3271 tipc_printf(buf, ":RR");
3272 if (link_reset_unknown(l_ptr))
3273 tipc_printf(buf, ":RU");
3274 if (link_working_working(l_ptr))
3275 tipc_printf(buf, ":WW");
3276 tipc_printf(buf, "\n");
3277}
3278
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