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[TIPC]: Links now validate destination node specified by incoming messages.
[GitHub/mt8127/android_kernel_alcatel_ttab.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
b97bf3fd 5 * Copyright (c) 2004-2005, 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
420 l_ptr = (struct link *)kmalloc(sizeof(*l_ptr), GFP_ATOMIC);
421 if (!l_ptr) {
422 warn("Memory squeeze; Failed to create link\n");
423 return NULL;
424 }
425 memset(l_ptr, 0, sizeof(*l_ptr));
426
427 l_ptr->addr = peer;
428 if_name = strchr(b_ptr->publ.name, ':') + 1;
429 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
430 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
431 tipc_node(tipc_own_addr),
432 if_name,
433 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
434 /* note: peer i/f is appended to link name by reset/activate */
435 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
436 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
437 list_add_tail(&l_ptr->link_list, &b_ptr->links);
438 l_ptr->checkpoint = 1;
439 l_ptr->b_ptr = b_ptr;
440 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
441 l_ptr->state = RESET_UNKNOWN;
442
443 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
444 msg = l_ptr->pmsg;
445 msg_init(msg, LINK_PROTOCOL, RESET_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
446 msg_set_size(msg, sizeof(l_ptr->proto_msg));
447 msg_set_session(msg, tipc_random);
448 msg_set_bearer_id(msg, b_ptr->identity);
449 strcpy((char *)msg_data(msg), if_name);
450
451 l_ptr->priority = b_ptr->priority;
4323add6 452 tipc_link_set_queue_limits(l_ptr, b_ptr->media->window);
b97bf3fd
PL		 453
454 link_init_max_pkt(l_ptr);
455
456 l_ptr->next_out_no = 1;
457 INIT_LIST_HEAD(&l_ptr->waiting_ports);
458
459 link_reset_statistics(l_ptr);
460
4323add6 461 l_ptr->owner = tipc_node_attach_link(l_ptr);
b97bf3fd
PL		 462 if (!l_ptr->owner) {
463 kfree(l_ptr);
464 return NULL;
465 }
466
467 if (LINK_LOG_BUF_SIZE) {
468 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
469
470 if (!pb) {
471 kfree(l_ptr);
472 warn("Memory squeeze; Failed to create link\n");
473 return NULL;
474 }
4323add6 475 tipc_printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
b97bf3fd
PL		 476 }
477
4323add6 478 tipc_k_signal((Handler)tipc_link_start, (unsigned long)l_ptr);
b97bf3fd 479
4323add6 480 dbg("tipc_link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
b97bf3fd
PL		 481 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
482
483 return l_ptr;
484}
485
486/**
4323add6 487 * tipc_link_delete - delete a link
b97bf3fd
PL		 488 * @l_ptr: pointer to link
489 *
4323add6 490 * Note: 'tipc_net_lock' is write_locked, bearer is locked.
b97bf3fd
PL		 491 * This routine must not grab the node lock until after link timer cancellation
492 * to avoid a potential deadlock situation.
493 */
494
4323add6 495void tipc_link_delete(struct link *l_ptr)
b97bf3fd
PL		 496{
497 if (!l_ptr) {
498 err("Attempt to delete non-existent link\n");
499 return;
500 }
501
4323add6 502 dbg("tipc_link_delete()\n");
b97bf3fd
PL		 503
504 k_cancel_timer(&l_ptr->timer);
505
4323add6
PL		 506 tipc_node_lock(l_ptr->owner);
507 tipc_link_reset(l_ptr);
508 tipc_node_detach_link(l_ptr->owner, l_ptr);
509 tipc_link_stop(l_ptr);
b97bf3fd
PL		 510 list_del_init(&l_ptr->link_list);
511 if (LINK_LOG_BUF_SIZE)
512 kfree(l_ptr->print_buf.buf);
4323add6 513 tipc_node_unlock(l_ptr->owner);
b97bf3fd
PL		 514 k_term_timer(&l_ptr->timer);
515 kfree(l_ptr);
516}
517
4323add6 518void tipc_link_start(struct link *l_ptr)
b97bf3fd 519{
4323add6 520 dbg("tipc_link_start %x\n", l_ptr);
b97bf3fd
PL		 521 link_state_event(l_ptr, STARTING_EVT);
522}
523
524/**
525 * link_schedule_port - schedule port for deferred sending
526 * @l_ptr: pointer to link
527 * @origport: reference to sending port
528 * @sz: amount of data to be sent
529 *
530 * Schedules port for renewed sending of messages after link congestion
531 * has abated.
532 */
533
534static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
535{
536 struct port *p_ptr;
537
4323add6
PL		 538 spin_lock_bh(&tipc_port_list_lock);
539 p_ptr = tipc_port_lock(origport);
b97bf3fd
PL		 540 if (p_ptr) {
541 if (!p_ptr->wakeup)
542 goto exit;
543 if (!list_empty(&p_ptr->wait_list))
544 goto exit;
545 p_ptr->congested_link = l_ptr;
546 p_ptr->publ.congested = 1;
547 p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
548 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
549 l_ptr->stats.link_congs++;
550exit:
4323add6 551 tipc_port_unlock(p_ptr);
b97bf3fd 552 }
4323add6 553 spin_unlock_bh(&tipc_port_list_lock);
b97bf3fd
PL		 554 return -ELINKCONG;
555}
556
4323add6 557void tipc_link_wakeup_ports(struct link *l_ptr, int all)
b97bf3fd
PL		 558{
559 struct port *p_ptr;
560 struct port *temp_p_ptr;
561 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
562
563 if (all)
564 win = 100000;
565 if (win <= 0)
566 return;
4323add6 567 if (!spin_trylock_bh(&tipc_port_list_lock))
b97bf3fd
PL		 568 return;
569 if (link_congested(l_ptr))
570 goto exit;
571 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
572 wait_list) {
573 if (win <= 0)
574 break;
575 list_del_init(&p_ptr->wait_list);
1fc54d8f 576 p_ptr->congested_link = NULL;
b97bf3fd
PL		 577 assert(p_ptr->wakeup);
578 spin_lock_bh(p_ptr->publ.lock);
579 p_ptr->publ.congested = 0;
580 p_ptr->wakeup(&p_ptr->publ);
581 win -= p_ptr->waiting_pkts;
582 spin_unlock_bh(p_ptr->publ.lock);
583 }
584
585exit:
4323add6 586 spin_unlock_bh(&tipc_port_list_lock);
b97bf3fd
PL		 587}
588
589/**
590 * link_release_outqueue - purge link's outbound message queue
591 * @l_ptr: pointer to link
592 */
593
594static void link_release_outqueue(struct link *l_ptr)
595{
596 struct sk_buff *buf = l_ptr->first_out;
597 struct sk_buff *next;
598
599 while (buf) {
600 next = buf->next;
601 buf_discard(buf);
602 buf = next;
603 }
604 l_ptr->first_out = NULL;
605 l_ptr->out_queue_size = 0;
606}
607
608/**
4323add6 609 * tipc_link_reset_fragments - purge link's inbound message fragments queue
b97bf3fd
PL		 610 * @l_ptr: pointer to link
611 */
612
4323add6 613void tipc_link_reset_fragments(struct link *l_ptr)
b97bf3fd
PL		 614{
615 struct sk_buff *buf = l_ptr->defragm_buf;
616 struct sk_buff *next;
617
618 while (buf) {
619 next = buf->next;
620 buf_discard(buf);
621 buf = next;
622 }
623 l_ptr->defragm_buf = NULL;
624}
625
626/**
4323add6 627 * tipc_link_stop - purge all inbound and outbound messages associated with link
b97bf3fd
PL		 628 * @l_ptr: pointer to link
629 */
630
4323add6 631void tipc_link_stop(struct link *l_ptr)
b97bf3fd
PL		 632{
633 struct sk_buff *buf;
634 struct sk_buff *next;
635
636 buf = l_ptr->oldest_deferred_in;
637 while (buf) {
638 next = buf->next;
639 buf_discard(buf);
640 buf = next;
641 }
642
643 buf = l_ptr->first_out;
644 while (buf) {
645 next = buf->next;
646 buf_discard(buf);
647 buf = next;
648 }
649
4323add6 650 tipc_link_reset_fragments(l_ptr);
b97bf3fd
PL		 651
652 buf_discard(l_ptr->proto_msg_queue);
653 l_ptr->proto_msg_queue = NULL;
654}
655
656#if 0
657
658/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
659
660static void link_recv_event(struct link_event *ev)
661{
662 ev->fcn(ev->addr, ev->name, ev->up);
663 kfree(ev);
664}
665
666static void link_send_event(void (*fcn)(u32 a, char *n, int up),
667 struct link *l_ptr, int up)
668{
669 struct link_event *ev;
670
671 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
672 if (!ev) {
673 warn("Link event allocation failure\n");
674 return;
675 }
676 ev->addr = l_ptr->addr;
677 ev->up = up;
678 ev->fcn = fcn;
679 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
4323add6 680 tipc_k_signal((Handler)link_recv_event, (unsigned long)ev);
b97bf3fd
PL		 681}
682
683#else
684
685#define link_send_event(fcn, l_ptr, up) do { } while (0)
686
687#endif
688
4323add6 689void tipc_link_reset(struct link *l_ptr)
b97bf3fd
PL		 690{
691 struct sk_buff *buf;
692 u32 prev_state = l_ptr->state;
693 u32 checkpoint = l_ptr->next_in_no;
694
695 msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
696
697 /* Link is down, accept any session: */
698 l_ptr->peer_session = 0;
699
700 /* Prepare for max packet size negotiation */
701 link_init_max_pkt(l_ptr);
702
703 l_ptr->state = RESET_UNKNOWN;
704 dbg_link_state("Resetting Link\n");
705
706 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
707 return;
708
4323add6
PL		 709 tipc_node_link_down(l_ptr->owner, l_ptr);
710 tipc_bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
b97bf3fd 711#if 0
4323add6 712 tipc_printf(TIPC_CONS, "\nReset link <%s>\n", l_ptr->name);
b97bf3fd
PL		 713 dbg_link_dump();
714#endif
4323add6 715 if (tipc_node_has_active_links(l_ptr->owner) &&
b97bf3fd
PL		 716 l_ptr->owner->permit_changeover) {
717 l_ptr->reset_checkpoint = checkpoint;
718 l_ptr->exp_msg_count = START_CHANGEOVER;
719 }
720
721 /* Clean up all queues: */
722
723 link_release_outqueue(l_ptr);
724 buf_discard(l_ptr->proto_msg_queue);
725 l_ptr->proto_msg_queue = NULL;
726 buf = l_ptr->oldest_deferred_in;
727 while (buf) {
728 struct sk_buff *next = buf->next;
729 buf_discard(buf);
730 buf = next;
731 }
732 if (!list_empty(&l_ptr->waiting_ports))
4323add6 733 tipc_link_wakeup_ports(l_ptr, 1);
b97bf3fd
PL		 734
735 l_ptr->retransm_queue_head = 0;
736 l_ptr->retransm_queue_size = 0;
737 l_ptr->last_out = NULL;
738 l_ptr->first_out = NULL;
739 l_ptr->next_out = NULL;
740 l_ptr->unacked_window = 0;
741 l_ptr->checkpoint = 1;
742 l_ptr->next_out_no = 1;
743 l_ptr->deferred_inqueue_sz = 0;
744 l_ptr->oldest_deferred_in = NULL;
745 l_ptr->newest_deferred_in = NULL;
746 l_ptr->fsm_msg_cnt = 0;
747 l_ptr->stale_count = 0;
748 link_reset_statistics(l_ptr);
749
4323add6 750 link_send_event(tipc_cfg_link_event, l_ptr, 0);
b97bf3fd 751 if (!in_own_cluster(l_ptr->addr))
4323add6 752 link_send_event(tipc_disc_link_event, l_ptr, 0);
b97bf3fd
PL		 753}
754
755
756static void link_activate(struct link *l_ptr)
757{
758 l_ptr->next_in_no = 1;
4323add6
PL		 759 tipc_node_link_up(l_ptr->owner, l_ptr);
760 tipc_bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
761 link_send_event(tipc_cfg_link_event, l_ptr, 1);
b97bf3fd 762 if (!in_own_cluster(l_ptr->addr))
4323add6 763 link_send_event(tipc_disc_link_event, l_ptr, 1);
b97bf3fd
PL		 764}
765
766/**
767 * link_state_event - link finite state machine
768 * @l_ptr: pointer to link
769 * @event: state machine event to process
770 */
771
772static void link_state_event(struct link *l_ptr, unsigned event)
773{
774 struct link *other;
775 u32 cont_intv = l_ptr->continuity_interval;
776
777 if (!l_ptr->started && (event != STARTING_EVT))
778 return; /* Not yet. */
779
780 if (link_blocked(l_ptr)) {
781 if (event == TIMEOUT_EVT) {
782 link_set_timer(l_ptr, cont_intv);
783 }
784 return; /* Changeover going on */
785 }
786 dbg_link("STATE_EV: <%s> ", l_ptr->name);
787
788 switch (l_ptr->state) {
789 case WORKING_WORKING:
790 dbg_link("WW/");
791 switch (event) {
792 case TRAFFIC_MSG_EVT:
793 dbg_link("TRF-");
794 /* fall through */
795 case ACTIVATE_MSG:
796 dbg_link("ACT\n");
797 break;
798 case TIMEOUT_EVT:
799 dbg_link("TIM ");
800 if (l_ptr->next_in_no != l_ptr->checkpoint) {
801 l_ptr->checkpoint = l_ptr->next_in_no;
4323add6
PL		 802 if (tipc_bclink_acks_missing(l_ptr->owner)) {
803 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
804 0, 0, 0, 0, 0);
b97bf3fd
PL		 805 l_ptr->fsm_msg_cnt++;
806 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
4323add6
PL		 807 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
808 1, 0, 0, 0, 0);
b97bf3fd
PL		 809 l_ptr->fsm_msg_cnt++;
810 }
811 link_set_timer(l_ptr, cont_intv);
812 break;
813 }
814 dbg_link(" -> WU\n");
815 l_ptr->state = WORKING_UNKNOWN;
816 l_ptr->fsm_msg_cnt = 0;
4323add6 817 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 818 l_ptr->fsm_msg_cnt++;
819 link_set_timer(l_ptr, cont_intv / 4);
820 break;
821 case RESET_MSG:
822 dbg_link("RES -> RR\n");
4323add6 823 tipc_link_reset(l_ptr);
b97bf3fd
PL		 824 l_ptr->state = RESET_RESET;
825 l_ptr->fsm_msg_cnt = 0;
4323add6 826 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 827 l_ptr->fsm_msg_cnt++;
828 link_set_timer(l_ptr, cont_intv);
829 break;
830 default:
831 err("Unknown link event %u in WW state\n", event);
832 }
833 break;
834 case WORKING_UNKNOWN:
835 dbg_link("WU/");
836 switch (event) {
837 case TRAFFIC_MSG_EVT:
838 dbg_link("TRF-");
839 case ACTIVATE_MSG:
840 dbg_link("ACT -> WW\n");
841 l_ptr->state = WORKING_WORKING;
842 l_ptr->fsm_msg_cnt = 0;
843 link_set_timer(l_ptr, cont_intv);
844 break;
845 case RESET_MSG:
846 dbg_link("RES -> RR\n");
4323add6 847 tipc_link_reset(l_ptr);
b97bf3fd
PL		 848 l_ptr->state = RESET_RESET;
849 l_ptr->fsm_msg_cnt = 0;
4323add6 850 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 851 l_ptr->fsm_msg_cnt++;
852 link_set_timer(l_ptr, cont_intv);
853 break;
854 case TIMEOUT_EVT:
855 dbg_link("TIM ");
856 if (l_ptr->next_in_no != l_ptr->checkpoint) {
857 dbg_link("-> WW \n");
858 l_ptr->state = WORKING_WORKING;
859 l_ptr->fsm_msg_cnt = 0;
860 l_ptr->checkpoint = l_ptr->next_in_no;
4323add6
PL		 861 if (tipc_bclink_acks_missing(l_ptr->owner)) {
862 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
863 0, 0, 0, 0, 0);
b97bf3fd
PL		 864 l_ptr->fsm_msg_cnt++;
865 }
866 link_set_timer(l_ptr, cont_intv);
867 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
868 dbg_link("Probing %u/%u,timer = %u ms)\n",
869 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
870 cont_intv / 4);
4323add6
PL		 871 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
872 1, 0, 0, 0, 0);
b97bf3fd
PL		 873 l_ptr->fsm_msg_cnt++;
874 link_set_timer(l_ptr, cont_intv / 4);
875 } else { /* Link has failed */
876 dbg_link("-> RU (%u probes unanswered)\n",
877 l_ptr->fsm_msg_cnt);
4323add6 878 tipc_link_reset(l_ptr);
b97bf3fd
PL		 879 l_ptr->state = RESET_UNKNOWN;
880 l_ptr->fsm_msg_cnt = 0;
4323add6
PL		 881 tipc_link_send_proto_msg(l_ptr, RESET_MSG,
882 0, 0, 0, 0, 0);
b97bf3fd
PL		 883 l_ptr->fsm_msg_cnt++;
884 link_set_timer(l_ptr, cont_intv);
885 }
886 break;
887 default:
888 err("Unknown link event %u in WU state\n", event);
889 }
890 break;
891 case RESET_UNKNOWN:
892 dbg_link("RU/");
893 switch (event) {
894 case TRAFFIC_MSG_EVT:
895 dbg_link("TRF-\n");
896 break;
897 case ACTIVATE_MSG:
898 other = l_ptr->owner->active_links[0];
899 if (other && link_working_unknown(other)) {
900 dbg_link("ACT\n");
901 break;
902 }
903 dbg_link("ACT -> WW\n");
904 l_ptr->state = WORKING_WORKING;
905 l_ptr->fsm_msg_cnt = 0;
906 link_activate(l_ptr);
4323add6 907 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 908 l_ptr->fsm_msg_cnt++;
909 link_set_timer(l_ptr, cont_intv);
910 break;
911 case RESET_MSG:
912 dbg_link("RES \n");
913 dbg_link(" -> RR\n");
914 l_ptr->state = RESET_RESET;
915 l_ptr->fsm_msg_cnt = 0;
4323add6 916 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 917 l_ptr->fsm_msg_cnt++;
918 link_set_timer(l_ptr, cont_intv);
919 break;
920 case STARTING_EVT:
921 dbg_link("START-");
922 l_ptr->started = 1;
923 /* fall through */
924 case TIMEOUT_EVT:
925 dbg_link("TIM \n");
4323add6 926 tipc_link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 927 l_ptr->fsm_msg_cnt++;
928 link_set_timer(l_ptr, cont_intv);
929 break;
930 default:
931 err("Unknown link event %u in RU state\n", event);
932 }
933 break;
934 case RESET_RESET:
935 dbg_link("RR/ ");
936 switch (event) {
937 case TRAFFIC_MSG_EVT:
938 dbg_link("TRF-");
939 /* fall through */
940 case ACTIVATE_MSG:
941 other = l_ptr->owner->active_links[0];
942 if (other && link_working_unknown(other)) {
943 dbg_link("ACT\n");
944 break;
945 }
946 dbg_link("ACT -> WW\n");
947 l_ptr->state = WORKING_WORKING;
948 l_ptr->fsm_msg_cnt = 0;
949 link_activate(l_ptr);
4323add6 950 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
b97bf3fd
PL		 951 l_ptr->fsm_msg_cnt++;
952 link_set_timer(l_ptr, cont_intv);
953 break;
954 case RESET_MSG:
955 dbg_link("RES\n");
956 break;
957 case TIMEOUT_EVT:
958 dbg_link("TIM\n");
4323add6 959 tipc_link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 960 l_ptr->fsm_msg_cnt++;
961 link_set_timer(l_ptr, cont_intv);
962 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
963 break;
964 default:
965 err("Unknown link event %u in RR state\n", event);
966 }
967 break;
968 default:
969 err("Unknown link state %u/%u\n", l_ptr->state, event);
970 }
971}
972
973/*
974 * link_bundle_buf(): Append contents of a buffer to
975 * the tail of an existing one.
976 */
977
978static int link_bundle_buf(struct link *l_ptr,
979 struct sk_buff *bundler,
980 struct sk_buff *buf)
981{
982 struct tipc_msg *bundler_msg = buf_msg(bundler);
983 struct tipc_msg *msg = buf_msg(buf);
984 u32 size = msg_size(msg);
985 u32 to_pos = align(msg_size(bundler_msg));
986 u32 rest = link_max_pkt(l_ptr) - to_pos;
987
988 if (msg_user(bundler_msg) != MSG_BUNDLER)
989 return 0;
990 if (msg_type(bundler_msg) != OPEN_MSG)
991 return 0;
992 if (rest < align(size))
993 return 0;
994
995 skb_put(bundler, (to_pos - msg_size(bundler_msg)) + size);
996 memcpy(bundler->data + to_pos, buf->data, size);
997 msg_set_size(bundler_msg, to_pos + size);
998 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
999 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
1000 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
1001 msg_dbg(msg, "PACKD:");
1002 buf_discard(buf);
1003 l_ptr->stats.sent_bundled++;
1004 return 1;
1005}
1006
05790c64
SR		 1007static void link_add_to_outqueue(struct link *l_ptr,
1008 struct sk_buff *buf,
1009 struct tipc_msg *msg)
b97bf3fd
PL		 1010{
1011 u32 ack = mod(l_ptr->next_in_no - 1);
1012 u32 seqno = mod(l_ptr->next_out_no++);
1013
1014 msg_set_word(msg, 2, ((ack << 16) | seqno));
1015 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1016 buf->next = NULL;
1017 if (l_ptr->first_out) {
1018 l_ptr->last_out->next = buf;
1019 l_ptr->last_out = buf;
1020 } else
1021 l_ptr->first_out = l_ptr->last_out = buf;
1022 l_ptr->out_queue_size++;
1023}
1024
1025/*
4323add6 1026 * tipc_link_send_buf() is the 'full path' for messages, called from
b97bf3fd
PL		 1027 * inside TIPC when the 'fast path' in tipc_send_buf
1028 * has failed, and from link_send()
1029 */
1030
4323add6 1031int tipc_link_send_buf(struct link *l_ptr, struct sk_buff *buf)
b97bf3fd
PL		 1032{
1033 struct tipc_msg *msg = buf_msg(buf);
1034 u32 size = msg_size(msg);
1035 u32 dsz = msg_data_sz(msg);
1036 u32 queue_size = l_ptr->out_queue_size;
1037 u32 imp = msg_tot_importance(msg);
1038 u32 queue_limit = l_ptr->queue_limit[imp];
1039 u32 max_packet = link_max_pkt(l_ptr);
1040
1041 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1042
1043 /* Match msg importance against queue limits: */
1044
1045 if (unlikely(queue_size >= queue_limit)) {
1046 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1047 return link_schedule_port(l_ptr, msg_origport(msg),
1048 size);
1049 }
1050 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1051 buf_discard(buf);
1052 if (imp > CONN_MANAGER) {
1053 warn("Resetting <%s>, send queue full", l_ptr->name);
4323add6 1054 tipc_link_reset(l_ptr);
b97bf3fd
PL		 1055 }
1056 return dsz;
1057 }
1058
1059 /* Fragmentation needed ? */
1060
1061 if (size > max_packet)
4323add6 1062 return tipc_link_send_long_buf(l_ptr, buf);
b97bf3fd
PL		 1063
1064 /* Packet can be queued or sent: */
1065
1066 if (queue_size > l_ptr->stats.max_queue_sz)
1067 l_ptr->stats.max_queue_sz = queue_size;
1068
4323add6 1069 if (likely(!tipc_bearer_congested(l_ptr->b_ptr, l_ptr) &&
b97bf3fd
PL		 1070 !link_congested(l_ptr))) {
1071 link_add_to_outqueue(l_ptr, buf, msg);
1072
4323add6 1073 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
b97bf3fd
PL		 1074 l_ptr->unacked_window = 0;
1075 } else {
4323add6 1076 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1077 l_ptr->stats.bearer_congs++;
1078 l_ptr->next_out = buf;
1079 }
1080 return dsz;
1081 }
1082 /* Congestion: can message be bundled ?: */
1083
1084 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1085 (msg_user(msg) != MSG_FRAGMENTER)) {
1086
1087 /* Try adding message to an existing bundle */
1088
1089 if (l_ptr->next_out &&
1090 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
4323add6 1091 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1092 return dsz;
1093 }
1094
1095 /* Try creating a new bundle */
1096
1097 if (size <= max_packet * 2 / 3) {
1098 struct sk_buff *bundler = buf_acquire(max_packet);
1099 struct tipc_msg bundler_hdr;
1100
1101 if (bundler) {
1102 msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1103 TIPC_OK, INT_H_SIZE, l_ptr->addr);
1104 memcpy(bundler->data, (unchar *)&bundler_hdr,
1105 INT_H_SIZE);
1106 skb_trim(bundler, INT_H_SIZE);
1107 link_bundle_buf(l_ptr, bundler, buf);
1108 buf = bundler;
1109 msg = buf_msg(buf);
1110 l_ptr->stats.sent_bundles++;
1111 }
1112 }
1113 }
1114 if (!l_ptr->next_out)
1115 l_ptr->next_out = buf;
1116 link_add_to_outqueue(l_ptr, buf, msg);
4323add6 1117 tipc_bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1118 return dsz;
1119}
1120
1121/*
4323add6 1122 * tipc_link_send(): same as tipc_link_send_buf(), but the link to use has
b97bf3fd
PL		 1123 * not been selected yet, and the the owner node is not locked
1124 * Called by TIPC internal users, e.g. the name distributor
1125 */
1126
4323add6 1127int tipc_link_send(struct sk_buff *buf, u32 dest, u32 selector)
b97bf3fd
PL		 1128{
1129 struct link *l_ptr;
1130 struct node *n_ptr;
1131 int res = -ELINKCONG;
1132
4323add6
PL		 1133 read_lock_bh(&tipc_net_lock);
1134 n_ptr = tipc_node_select(dest, selector);
b97bf3fd 1135 if (n_ptr) {
4323add6 1136 tipc_node_lock(n_ptr);
b97bf3fd 1137 l_ptr = n_ptr->active_links[selector & 1];
4323add6 1138 dbg("tipc_link_send: found link %x for dest %x\n", l_ptr, dest);
b97bf3fd 1139 if (l_ptr) {
4323add6 1140 res = tipc_link_send_buf(l_ptr, buf);
b97bf3fd 1141 }
4323add6 1142 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1143 } else {
1144 dbg("Attempt to send msg to unknown node:\n");
1145 msg_dbg(buf_msg(buf),">>>");
1146 buf_discard(buf);
1147 }
4323add6 1148 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1149 return res;
1150}
1151
1152/*
1153 * link_send_buf_fast: Entry for data messages where the
1154 * destination link is known and the header is complete,
1155 * inclusive total message length. Very time critical.
1156 * Link is locked. Returns user data length.
1157 */
1158
05790c64
SR		 1159static int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1160 u32 *used_max_pkt)
b97bf3fd
PL		 1161{
1162 struct tipc_msg *msg = buf_msg(buf);
1163 int res = msg_data_sz(msg);
1164
1165 if (likely(!link_congested(l_ptr))) {
1166 if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
1167 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1168 link_add_to_outqueue(l_ptr, buf, msg);
4323add6
PL		 1169 if (likely(tipc_bearer_send(l_ptr->b_ptr, buf,
1170 &l_ptr->media_addr))) {
b97bf3fd
PL		 1171 l_ptr->unacked_window = 0;
1172 msg_dbg(msg,"SENT_FAST:");
1173 return res;
1174 }
1175 dbg("failed sent fast...\n");
4323add6 1176 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1177 l_ptr->stats.bearer_congs++;
1178 l_ptr->next_out = buf;
1179 return res;
1180 }
1181 }
1182 else
1183 *used_max_pkt = link_max_pkt(l_ptr);
1184 }
4323add6 1185 return tipc_link_send_buf(l_ptr, buf); /* All other cases */
b97bf3fd
PL		 1186}
1187
1188/*
1189 * tipc_send_buf_fast: Entry for data messages where the
1190 * destination node is known and the header is complete,
1191 * inclusive total message length.
1192 * Returns user data length.
1193 */
1194int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1195{
1196 struct link *l_ptr;
1197 struct node *n_ptr;
1198 int res;
1199 u32 selector = msg_origport(buf_msg(buf)) & 1;
1200 u32 dummy;
1201
1202 if (destnode == tipc_own_addr)
4323add6 1203 return tipc_port_recv_msg(buf);
b97bf3fd 1204
4323add6
PL		 1205 read_lock_bh(&tipc_net_lock);
1206 n_ptr = tipc_node_select(destnode, selector);
b97bf3fd 1207 if (likely(n_ptr)) {
4323add6 1208 tipc_node_lock(n_ptr);
b97bf3fd
PL		 1209 l_ptr = n_ptr->active_links[selector];
1210 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1211 buf, l_ptr, destnode);
1212 if (likely(l_ptr)) {
1213 res = link_send_buf_fast(l_ptr, buf, &dummy);
4323add6
PL		 1214 tipc_node_unlock(n_ptr);
1215 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1216 return res;
1217 }
4323add6 1218 tipc_node_unlock(n_ptr);
b97bf3fd 1219 }
4323add6 1220 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1221 res = msg_data_sz(buf_msg(buf));
1222 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1223 return res;
1224}
1225
1226
1227/*
4323add6 1228 * tipc_link_send_sections_fast: Entry for messages where the
b97bf3fd
PL		 1229 * destination processor is known and the header is complete,
1230 * except for total message length.
1231 * Returns user data length or errno.
1232 */
4323add6
PL		 1233int tipc_link_send_sections_fast(struct port *sender,
1234 struct iovec const *msg_sect,
1235 const u32 num_sect,
1236 u32 destaddr)
b97bf3fd
PL		 1237{
1238 struct tipc_msg *hdr = &sender->publ.phdr;
1239 struct link *l_ptr;
1240 struct sk_buff *buf;
1241 struct node *node;
1242 int res;
1243 u32 selector = msg_origport(hdr) & 1;
1244
1245 assert(destaddr != tipc_own_addr);
1246
1247again:
1248 /*
1249 * Try building message using port's max_pkt hint.
1250 * (Must not hold any locks while building message.)
1251 */
1252
1253 res = msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
1254 !sender->user_port, &buf);
1255
4323add6
PL		 1256 read_lock_bh(&tipc_net_lock);
1257 node = tipc_node_select(destaddr, selector);
b97bf3fd 1258 if (likely(node)) {
4323add6 1259 tipc_node_lock(node);
b97bf3fd
PL		 1260 l_ptr = node->active_links[selector];
1261 if (likely(l_ptr)) {
1262 if (likely(buf)) {
1263 res = link_send_buf_fast(l_ptr, buf,
1264 &sender->max_pkt);
1265 if (unlikely(res < 0))
1266 buf_discard(buf);
1267exit:
4323add6
PL		 1268 tipc_node_unlock(node);
1269 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1270 return res;
1271 }
1272
1273 /* Exit if build request was invalid */
1274
1275 if (unlikely(res < 0))
1276 goto exit;
1277
1278 /* Exit if link (or bearer) is congested */
1279
1280 if (link_congested(l_ptr) ||
1281 !list_empty(&l_ptr->b_ptr->cong_links)) {
1282 res = link_schedule_port(l_ptr,
1283 sender->publ.ref, res);
1284 goto exit;
1285 }
1286
1287 /*
1288 * Message size exceeds max_pkt hint; update hint,
1289 * then re-try fast path or fragment the message
1290 */
1291
1292 sender->max_pkt = link_max_pkt(l_ptr);
4323add6
PL		 1293 tipc_node_unlock(node);
1294 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1295
1296
1297 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
1298 goto again;
1299
1300 return link_send_sections_long(sender, msg_sect,
1301 num_sect, destaddr);
1302 }
4323add6 1303 tipc_node_unlock(node);
b97bf3fd 1304 }
4323add6 1305 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1306
1307 /* Couldn't find a link to the destination node */
1308
1309 if (buf)
1310 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1311 if (res >= 0)
4323add6
PL		 1312 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1313 TIPC_ERR_NO_NODE);
b97bf3fd
PL		 1314 return res;
1315}
1316
1317/*
1318 * link_send_sections_long(): Entry for long messages where the
1319 * destination node is known and the header is complete,
1320 * inclusive total message length.
1321 * Link and bearer congestion status have been checked to be ok,
1322 * and are ignored if they change.
1323 *
1324 * Note that fragments do not use the full link MTU so that they won't have
1325 * to undergo refragmentation if link changeover causes them to be sent
1326 * over another link with an additional tunnel header added as prefix.
1327 * (Refragmentation will still occur if the other link has a smaller MTU.)
1328 *
1329 * Returns user data length or errno.
1330 */
1331static int link_send_sections_long(struct port *sender,
1332 struct iovec const *msg_sect,
1333 u32 num_sect,
1334 u32 destaddr)
1335{
1336 struct link *l_ptr;
1337 struct node *node;
1338 struct tipc_msg *hdr = &sender->publ.phdr;
1339 u32 dsz = msg_data_sz(hdr);
1340 u32 max_pkt,fragm_sz,rest;
1341 struct tipc_msg fragm_hdr;
1342 struct sk_buff *buf,*buf_chain,*prev;
1343 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1344 const unchar *sect_crs;
1345 int curr_sect;
1346 u32 fragm_no;
1347
1348again:
1349 fragm_no = 1;
1350 max_pkt = sender->max_pkt - INT_H_SIZE;
1351 /* leave room for tunnel header in case of link changeover */
1352 fragm_sz = max_pkt - INT_H_SIZE;
1353 /* leave room for fragmentation header in each fragment */
1354 rest = dsz;
1355 fragm_crs = 0;
1356 fragm_rest = 0;
1357 sect_rest = 0;
1fc54d8f 1358 sect_crs = NULL;
b97bf3fd
PL		 1359 curr_sect = -1;
1360
1361 /* Prepare reusable fragment header: */
1362
1363 msg_dbg(hdr, ">FRAGMENTING>");
1364 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1365 TIPC_OK, INT_H_SIZE, msg_destnode(hdr));
1366 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1367 msg_set_size(&fragm_hdr, max_pkt);
1368 msg_set_fragm_no(&fragm_hdr, 1);
1369
1370 /* Prepare header of first fragment: */
1371
1372 buf_chain = buf = buf_acquire(max_pkt);
1373 if (!buf)
1374 return -ENOMEM;
1375 buf->next = NULL;
1376 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1377 hsz = msg_hdr_sz(hdr);
1378 memcpy(buf->data + INT_H_SIZE, (unchar *)hdr, hsz);
1379 msg_dbg(buf_msg(buf), ">BUILD>");
1380
1381 /* Chop up message: */
1382
1383 fragm_crs = INT_H_SIZE + hsz;
1384 fragm_rest = fragm_sz - hsz;
1385
1386 do { /* For all sections */
1387 u32 sz;
1388
1389 if (!sect_rest) {
1390 sect_rest = msg_sect[++curr_sect].iov_len;
1391 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1392 }
1393
1394 if (sect_rest < fragm_rest)
1395 sz = sect_rest;
1396 else
1397 sz = fragm_rest;
1398
1399 if (likely(!sender->user_port)) {
1400 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1401error:
1402 for (; buf_chain; buf_chain = buf) {
1403 buf = buf_chain->next;
1404 buf_discard(buf_chain);
1405 }
1406 return -EFAULT;
1407 }
1408 } else
1409 memcpy(buf->data + fragm_crs, sect_crs, sz);
1410
1411 sect_crs += sz;
1412 sect_rest -= sz;
1413 fragm_crs += sz;
1414 fragm_rest -= sz;
1415 rest -= sz;
1416
1417 if (!fragm_rest && rest) {
1418
1419 /* Initiate new fragment: */
1420 if (rest <= fragm_sz) {
1421 fragm_sz = rest;
1422 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1423 } else {
1424 msg_set_type(&fragm_hdr, FRAGMENT);
1425 }
1426 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1427 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1428 prev = buf;
1429 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1430 if (!buf)
1431 goto error;
1432
1433 buf->next = NULL;
1434 prev->next = buf;
1435 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1436 fragm_crs = INT_H_SIZE;
1437 fragm_rest = fragm_sz;
1438 msg_dbg(buf_msg(buf)," >BUILD>");
1439 }
1440 }
1441 while (rest > 0);
1442
1443 /*
1444 * Now we have a buffer chain. Select a link and check
1445 * that packet size is still OK
1446 */
4323add6 1447 node = tipc_node_select(destaddr, sender->publ.ref & 1);
b97bf3fd 1448 if (likely(node)) {
4323add6 1449 tipc_node_lock(node);
b97bf3fd
PL		 1450 l_ptr = node->active_links[sender->publ.ref & 1];
1451 if (!l_ptr) {
4323add6 1452 tipc_node_unlock(node);
b97bf3fd
PL		 1453 goto reject;
1454 }
1455 if (link_max_pkt(l_ptr) < max_pkt) {
1456 sender->max_pkt = link_max_pkt(l_ptr);
4323add6 1457 tipc_node_unlock(node);
b97bf3fd
PL		 1458 for (; buf_chain; buf_chain = buf) {
1459 buf = buf_chain->next;
1460 buf_discard(buf_chain);
1461 }
1462 goto again;
1463 }
1464 } else {
1465reject:
1466 for (; buf_chain; buf_chain = buf) {
1467 buf = buf_chain->next;
1468 buf_discard(buf_chain);
1469 }
4323add6
PL		 1470 return tipc_port_reject_sections(sender, hdr, msg_sect, num_sect,
1471 TIPC_ERR_NO_NODE);
b97bf3fd
PL		 1472 }
1473
1474 /* Append whole chain to send queue: */
1475
1476 buf = buf_chain;
1477 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1478 if (!l_ptr->next_out)
1479 l_ptr->next_out = buf_chain;
1480 l_ptr->stats.sent_fragmented++;
1481 while (buf) {
1482 struct sk_buff *next = buf->next;
1483 struct tipc_msg *msg = buf_msg(buf);
1484
1485 l_ptr->stats.sent_fragments++;
1486 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1487 link_add_to_outqueue(l_ptr, buf, msg);
1488 msg_dbg(msg, ">ADD>");
1489 buf = next;
1490 }
1491
1492 /* Send it, if possible: */
1493
4323add6
PL		 1494 tipc_link_push_queue(l_ptr);
1495 tipc_node_unlock(node);
b97bf3fd
PL		 1496 return dsz;
1497}
1498
1499/*
4323add6 1500 * tipc_link_push_packet: Push one unsent packet to the media
b97bf3fd 1501 */
4323add6 1502u32 tipc_link_push_packet(struct link *l_ptr)
b97bf3fd
PL		 1503{
1504 struct sk_buff *buf = l_ptr->first_out;
1505 u32 r_q_size = l_ptr->retransm_queue_size;
1506 u32 r_q_head = l_ptr->retransm_queue_head;
1507
1508 /* Step to position where retransmission failed, if any, */
1509 /* consider that buffers may have been released in meantime */
1510
1511 if (r_q_size && buf) {
1512 u32 last = lesser(mod(r_q_head + r_q_size),
1513 link_last_sent(l_ptr));
1514 u32 first = msg_seqno(buf_msg(buf));
1515
1516 while (buf && less(first, r_q_head)) {
1517 first = mod(first + 1);
1518 buf = buf->next;
1519 }
1520 l_ptr->retransm_queue_head = r_q_head = first;
1521 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1522 }
1523
1524 /* Continue retransmission now, if there is anything: */
1525
1526 if (r_q_size && buf && !skb_cloned(buf)) {
1527 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1528 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
4323add6 1529 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1530 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1531 l_ptr->retransm_queue_head = mod(++r_q_head);
1532 l_ptr->retransm_queue_size = --r_q_size;
1533 l_ptr->stats.retransmitted++;
1534 return TIPC_OK;
1535 } else {
1536 l_ptr->stats.bearer_congs++;
1537 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1538 return PUSH_FAILED;
1539 }
1540 }
1541
1542 /* Send deferred protocol message, if any: */
1543
1544 buf = l_ptr->proto_msg_queue;
1545 if (buf) {
1546 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1547 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
4323add6 1548 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1549 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1550 l_ptr->unacked_window = 0;
1551 buf_discard(buf);
1fc54d8f 1552 l_ptr->proto_msg_queue = NULL;
b97bf3fd
PL		 1553 return TIPC_OK;
1554 } else {
1555 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1556 l_ptr->stats.bearer_congs++;
1557 return PUSH_FAILED;
1558 }
1559 }
1560
1561 /* Send one deferred data message, if send window not full: */
1562
1563 buf = l_ptr->next_out;
1564 if (buf) {
1565 struct tipc_msg *msg = buf_msg(buf);
1566 u32 next = msg_seqno(msg);
1567 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1568
1569 if (mod(next - first) < l_ptr->queue_limit[0]) {
1570 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1571 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
4323add6 1572 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1573 if (msg_user(msg) == MSG_BUNDLER)
1574 msg_set_type(msg, CLOSED_MSG);
1575 msg_dbg(msg, ">PUSH-DATA>");
1576 l_ptr->next_out = buf->next;
1577 return TIPC_OK;
1578 } else {
1579 msg_dbg(msg, "|PUSH-DATA|");
1580 l_ptr->stats.bearer_congs++;
1581 return PUSH_FAILED;
1582 }
1583 }
1584 }
1585 return PUSH_FINISHED;
1586}
1587
1588/*
1589 * push_queue(): push out the unsent messages of a link where
1590 * congestion has abated. Node is locked
1591 */
4323add6 1592void tipc_link_push_queue(struct link *l_ptr)
b97bf3fd
PL		 1593{
1594 u32 res;
1595
4323add6 1596 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr))
b97bf3fd
PL		 1597 return;
1598
1599 do {
4323add6 1600 res = tipc_link_push_packet(l_ptr);
b97bf3fd
PL		 1601 }
1602 while (res == TIPC_OK);
1603 if (res == PUSH_FAILED)
4323add6 1604 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1605}
1606
4323add6
PL		 1607void tipc_link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1608 u32 retransmits)
b97bf3fd
PL		 1609{
1610 struct tipc_msg *msg;
1611
1612 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1613
4323add6 1614 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr) && buf && !skb_cloned(buf)) {
b97bf3fd
PL		 1615 msg_dbg(buf_msg(buf), ">NO_RETR->BCONG>");
1616 dbg_print_link(l_ptr, " ");
1617 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1618 l_ptr->retransm_queue_size = retransmits;
1619 return;
1620 }
1621 while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
1622 msg = buf_msg(buf);
1623 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1624 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
4323add6 1625 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 1626 /* Catch if retransmissions fail repeatedly: */
1627 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1628 if (++l_ptr->stale_count > 100) {
4323add6 1629 tipc_msg_print(TIPC_CONS, buf_msg(buf), ">RETR>");
b97bf3fd
PL		 1630 info("...Retransmitted %u times\n",
1631 l_ptr->stale_count);
53b3531b 1632 link_print(l_ptr, TIPC_CONS, "Resetting Link\n");
4323add6 1633 tipc_link_reset(l_ptr);
b97bf3fd
PL		 1634 break;
1635 }
1636 } else {
1637 l_ptr->stale_count = 0;
1638 }
1639 l_ptr->last_retransmitted = msg_seqno(msg);
1640
1641 msg_dbg(buf_msg(buf), ">RETR>");
1642 buf = buf->next;
1643 retransmits--;
1644 l_ptr->stats.retransmitted++;
1645 } else {
4323add6 1646 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 1647 l_ptr->stats.bearer_congs++;
1648 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1649 l_ptr->retransm_queue_size = retransmits;
1650 return;
1651 }
1652 }
1653 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1654}
1655
1656/*
1657 * link_recv_non_seq: Receive packets which are outside
1658 * the link sequence flow
1659 */
1660
1661static void link_recv_non_seq(struct sk_buff *buf)
1662{
1663 struct tipc_msg *msg = buf_msg(buf);
1664
1665 if (msg_user(msg) == LINK_CONFIG)
4323add6 1666 tipc_disc_recv_msg(buf);
b97bf3fd 1667 else
4323add6 1668 tipc_bclink_recv_pkt(buf);
b97bf3fd
PL		 1669}
1670
1671/**
1672 * link_insert_deferred_queue - insert deferred messages back into receive chain
1673 */
1674
1675static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1676 struct sk_buff *buf)
1677{
1678 u32 seq_no;
1679
1680 if (l_ptr->oldest_deferred_in == NULL)
1681 return buf;
1682
1683 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1684 if (seq_no == mod(l_ptr->next_in_no)) {
1685 l_ptr->newest_deferred_in->next = buf;
1686 buf = l_ptr->oldest_deferred_in;
1687 l_ptr->oldest_deferred_in = NULL;
1688 l_ptr->deferred_inqueue_sz = 0;
1689 }
1690 return buf;
1691}
1692
1693void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1694{
4323add6 1695 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 1696 while (head) {
1697 struct bearer *b_ptr;
1698 struct node *n_ptr;
1699 struct link *l_ptr;
1700 struct sk_buff *crs;
1701 struct sk_buff *buf = head;
1702 struct tipc_msg *msg = buf_msg(buf);
1703 u32 seq_no = msg_seqno(msg);
1704 u32 ackd = msg_ack(msg);
1705 u32 released = 0;
1706 int type;
1707
1708 b_ptr = (struct bearer *)tb_ptr;
1709 TIPC_SKB_CB(buf)->handle = b_ptr;
1710
1711 head = head->next;
1712 if (unlikely(msg_version(msg) != TIPC_VERSION))
1713 goto cont;
1714#if 0
1715 if (msg_user(msg) != LINK_PROTOCOL)
1716#endif
1717 msg_dbg(msg,"<REC<");
1718
1719 if (unlikely(msg_non_seq(msg))) {
1720 link_recv_non_seq(buf);
1721 continue;
1722 }
26008247
AS		 1723
1724 if (unlikely(!msg_short(msg) &&
1725 (msg_destnode(msg) != tipc_own_addr)))
1726 goto cont;
1727
4323add6 1728 n_ptr = tipc_node_find(msg_prevnode(msg));
b97bf3fd
PL		 1729 if (unlikely(!n_ptr))
1730 goto cont;
1731
4323add6 1732 tipc_node_lock(n_ptr);
b97bf3fd
PL		 1733 l_ptr = n_ptr->links[b_ptr->identity];
1734 if (unlikely(!l_ptr)) {
4323add6 1735 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1736 goto cont;
1737 }
1738 /*
1739 * Release acked messages
1740 */
1741 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
4323add6
PL		 1742 if (tipc_node_is_up(n_ptr) && n_ptr->bclink.supported)
1743 tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
b97bf3fd
PL		 1744 }
1745
1746 crs = l_ptr->first_out;
1747 while ((crs != l_ptr->next_out) &&
1748 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1749 struct sk_buff *next = crs->next;
1750
1751 buf_discard(crs);
1752 crs = next;
1753 released++;
1754 }
1755 if (released) {
1756 l_ptr->first_out = crs;
1757 l_ptr->out_queue_size -= released;
1758 }
1759 if (unlikely(l_ptr->next_out))
4323add6 1760 tipc_link_push_queue(l_ptr);
b97bf3fd 1761 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
4323add6 1762 tipc_link_wakeup_ports(l_ptr, 0);
b97bf3fd
PL		 1763 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1764 l_ptr->stats.sent_acks++;
4323add6 1765 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 1766 }
1767
1768protocol_check:
1769 if (likely(link_working_working(l_ptr))) {
1770 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1771 l_ptr->next_in_no++;
1772 if (unlikely(l_ptr->oldest_deferred_in))
1773 head = link_insert_deferred_queue(l_ptr,
1774 head);
1775 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1776deliver:
1777 if (likely(msg_isdata(msg))) {
4323add6
PL		 1778 tipc_node_unlock(n_ptr);
1779 tipc_port_recv_msg(buf);
b97bf3fd
PL		 1780 continue;
1781 }
1782 switch (msg_user(msg)) {
1783 case MSG_BUNDLER:
1784 l_ptr->stats.recv_bundles++;
1785 l_ptr->stats.recv_bundled +=
1786 msg_msgcnt(msg);
4323add6
PL		 1787 tipc_node_unlock(n_ptr);
1788 tipc_link_recv_bundle(buf);
b97bf3fd
PL		 1789 continue;
1790 case ROUTE_DISTRIBUTOR:
4323add6
PL		 1791 tipc_node_unlock(n_ptr);
1792 tipc_cltr_recv_routing_table(buf);
b97bf3fd
PL		 1793 continue;
1794 case NAME_DISTRIBUTOR:
4323add6
PL		 1795 tipc_node_unlock(n_ptr);
1796 tipc_named_recv(buf);
b97bf3fd
PL		 1797 continue;
1798 case CONN_MANAGER:
4323add6
PL		 1799 tipc_node_unlock(n_ptr);
1800 tipc_port_recv_proto_msg(buf);
b97bf3fd
PL		 1801 continue;
1802 case MSG_FRAGMENTER:
1803 l_ptr->stats.recv_fragments++;
4323add6
PL		 1804 if (tipc_link_recv_fragment(&l_ptr->defragm_buf,
1805 &buf, &msg)) {
b97bf3fd
PL		 1806 l_ptr->stats.recv_fragmented++;
1807 goto deliver;
1808 }
1809 break;
1810 case CHANGEOVER_PROTOCOL:
1811 type = msg_type(msg);
4323add6 1812 if (link_recv_changeover_msg(&l_ptr, &buf)) {
b97bf3fd
PL		 1813 msg = buf_msg(buf);
1814 seq_no = msg_seqno(msg);
1815 TIPC_SKB_CB(buf)->handle
1816 = b_ptr;
1817 if (type == ORIGINAL_MSG)
1818 goto deliver;
1819 goto protocol_check;
1820 }
1821 break;
1822 }
1823 }
4323add6
PL		 1824 tipc_node_unlock(n_ptr);
1825 tipc_net_route_msg(buf);
b97bf3fd
PL		 1826 continue;
1827 }
1828 link_handle_out_of_seq_msg(l_ptr, buf);
1829 head = link_insert_deferred_queue(l_ptr, head);
4323add6 1830 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1831 continue;
1832 }
1833
1834 if (msg_user(msg) == LINK_PROTOCOL) {
1835 link_recv_proto_msg(l_ptr, buf);
1836 head = link_insert_deferred_queue(l_ptr, head);
4323add6 1837 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1838 continue;
1839 }
1840 msg_dbg(msg,"NSEQ<REC<");
1841 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1842
1843 if (link_working_working(l_ptr)) {
1844 /* Re-insert in front of queue */
1845 msg_dbg(msg,"RECV-REINS:");
1846 buf->next = head;
1847 head = buf;
4323add6 1848 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1849 continue;
1850 }
4323add6 1851 tipc_node_unlock(n_ptr);
b97bf3fd
PL		 1852cont:
1853 buf_discard(buf);
1854 }
4323add6 1855 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 1856}
1857
1858/*
1859 * link_defer_buf(): Sort a received out-of-sequence packet
1860 * into the deferred reception queue.
1861 * Returns the increase of the queue length,i.e. 0 or 1
1862 */
1863
4323add6
PL		 1864u32 tipc_link_defer_pkt(struct sk_buff **head,
1865 struct sk_buff **tail,
1866 struct sk_buff *buf)
b97bf3fd 1867{
1fc54d8f 1868 struct sk_buff *prev = NULL;
b97bf3fd
PL		 1869 struct sk_buff *crs = *head;
1870 u32 seq_no = msg_seqno(buf_msg(buf));
1871
1872 buf->next = NULL;
1873
1874 /* Empty queue ? */
1875 if (*head == NULL) {
1876 *head = *tail = buf;
1877 return 1;
1878 }
1879
1880 /* Last ? */
1881 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1882 (*tail)->next = buf;
1883 *tail = buf;
1884 return 1;
1885 }
1886
1887 /* Scan through queue and sort it in */
1888 do {
1889 struct tipc_msg *msg = buf_msg(crs);
1890
1891 if (less(seq_no, msg_seqno(msg))) {
1892 buf->next = crs;
1893 if (prev)
1894 prev->next = buf;
1895 else
1896 *head = buf;
1897 return 1;
1898 }
1899 if (seq_no == msg_seqno(msg)) {
1900 break;
1901 }
1902 prev = crs;
1903 crs = crs->next;
1904 }
1905 while (crs);
1906
1907 /* Message is a duplicate of an existing message */
1908
1909 buf_discard(buf);
1910 return 0;
1911}
1912
1913/**
1914 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1915 */
1916
1917static void link_handle_out_of_seq_msg(struct link *l_ptr,
1918 struct sk_buff *buf)
1919{
1920 u32 seq_no = msg_seqno(buf_msg(buf));
1921
1922 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1923 link_recv_proto_msg(l_ptr, buf);
1924 return;
1925 }
1926
1927 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
1928 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
1929
1930 /* Record OOS packet arrival (force mismatch on next timeout) */
1931
1932 l_ptr->checkpoint--;
1933
1934 /*
1935 * Discard packet if a duplicate; otherwise add it to deferred queue
1936 * and notify peer of gap as per protocol specification
1937 */
1938
1939 if (less(seq_no, mod(l_ptr->next_in_no))) {
1940 l_ptr->stats.duplicates++;
1941 buf_discard(buf);
1942 return;
1943 }
1944
4323add6
PL		 1945 if (tipc_link_defer_pkt(&l_ptr->oldest_deferred_in,
1946 &l_ptr->newest_deferred_in, buf)) {
b97bf3fd
PL		 1947 l_ptr->deferred_inqueue_sz++;
1948 l_ptr->stats.deferred_recv++;
1949 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
4323add6 1950 tipc_link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
b97bf3fd
PL		 1951 } else
1952 l_ptr->stats.duplicates++;
1953}
1954
1955/*
1956 * Send protocol message to the other endpoint.
1957 */
4323add6
PL		 1958void tipc_link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
1959 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
b97bf3fd 1960{
1fc54d8f 1961 struct sk_buff *buf = NULL;
b97bf3fd
PL		 1962 struct tipc_msg *msg = l_ptr->pmsg;
1963 u32 msg_size = sizeof(l_ptr->proto_msg);
1964
1965 if (link_blocked(l_ptr))
1966 return;
1967 msg_set_type(msg, msg_typ);
1968 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
1969 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
4323add6 1970 msg_set_last_bcast(msg, tipc_bclink_get_last_sent());
b97bf3fd
PL		 1971
1972 if (msg_typ == STATE_MSG) {
1973 u32 next_sent = mod(l_ptr->next_out_no);
1974
4323add6 1975 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 1976 return;
1977 if (l_ptr->next_out)
1978 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
1979 msg_set_next_sent(msg, next_sent);
1980 if (l_ptr->oldest_deferred_in) {
1981 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1982 gap = mod(rec - mod(l_ptr->next_in_no));
1983 }
1984 msg_set_seq_gap(msg, gap);
1985 if (gap)
1986 l_ptr->stats.sent_nacks++;
1987 msg_set_link_tolerance(msg, tolerance);
1988 msg_set_linkprio(msg, priority);
1989 msg_set_max_pkt(msg, ack_mtu);
1990 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1991 msg_set_probe(msg, probe_msg != 0);
1992 if (probe_msg) {
1993 u32 mtu = l_ptr->max_pkt;
1994
1995 if ((mtu < l_ptr->max_pkt_target) &&
1996 link_working_working(l_ptr) &&
1997 l_ptr->fsm_msg_cnt) {
1998 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1999 if (l_ptr->max_pkt_probes == 10) {
2000 l_ptr->max_pkt_target = (msg_size - 4);
2001 l_ptr->max_pkt_probes = 0;
2002 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
2003 }
2004 l_ptr->max_pkt_probes++;
2005 }
2006
2007 l_ptr->stats.sent_probes++;
2008 }
2009 l_ptr->stats.sent_states++;
2010 } else { /* RESET_MSG or ACTIVATE_MSG */
2011 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2012 msg_set_seq_gap(msg, 0);
2013 msg_set_next_sent(msg, 1);
2014 msg_set_link_tolerance(msg, l_ptr->tolerance);
2015 msg_set_linkprio(msg, l_ptr->priority);
2016 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2017 }
2018
4323add6 2019 if (tipc_node_has_redundant_links(l_ptr->owner)) {
b97bf3fd
PL		 2020 msg_set_redundant_link(msg);
2021 } else {
2022 msg_clear_redundant_link(msg);
2023 }
2024 msg_set_linkprio(msg, l_ptr->priority);
2025
2026 /* Ensure sequence number will not fit : */
2027
2028 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2029
2030 /* Congestion? */
2031
4323add6 2032 if (tipc_bearer_congested(l_ptr->b_ptr, l_ptr)) {
b97bf3fd
PL		 2033 if (!l_ptr->proto_msg_queue) {
2034 l_ptr->proto_msg_queue =
2035 buf_acquire(sizeof(l_ptr->proto_msg));
2036 }
2037 buf = l_ptr->proto_msg_queue;
2038 if (!buf)
2039 return;
2040 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2041 return;
2042 }
2043 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2044
2045 /* Message can be sent */
2046
2047 msg_dbg(msg, ">>");
2048
2049 buf = buf_acquire(msg_size);
2050 if (!buf)
2051 return;
2052
2053 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2054 msg_set_size(buf_msg(buf), msg_size);
2055
4323add6 2056 if (tipc_bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
b97bf3fd
PL		 2057 l_ptr->unacked_window = 0;
2058 buf_discard(buf);
2059 return;
2060 }
2061
2062 /* New congestion */
4323add6 2063 tipc_bearer_schedule(l_ptr->b_ptr, l_ptr);
b97bf3fd
PL		 2064 l_ptr->proto_msg_queue = buf;
2065 l_ptr->stats.bearer_congs++;
2066}
2067
2068/*
2069 * Receive protocol message :
2070 * Note that network plane id propagates through the network, and may
2071 * change at any time. The node with lowest address rules
2072 */
2073
2074static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2075{
2076 u32 rec_gap = 0;
2077 u32 max_pkt_info;
2078 u32 max_pkt_ack;
2079 u32 msg_tol;
2080 struct tipc_msg *msg = buf_msg(buf);
2081
2082 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2083 msg_dbg(msg, "<<");
2084 if (link_blocked(l_ptr))
2085 goto exit;
2086
2087 /* record unnumbered packet arrival (force mismatch on next timeout) */
2088
2089 l_ptr->checkpoint--;
2090
2091 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2092 if (tipc_own_addr > msg_prevnode(msg))
2093 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2094
2095 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2096
2097 switch (msg_type(msg)) {
2098
2099 case RESET_MSG:
2100 if (!link_working_unknown(l_ptr) && l_ptr->peer_session) {
2101 if (msg_session(msg) == l_ptr->peer_session) {
2102 dbg("Duplicate RESET: %u<->%u\n",
2103 msg_session(msg), l_ptr->peer_session);
2104 break; /* duplicate: ignore */
2105 }
2106 }
2107 /* fall thru' */
2108 case ACTIVATE_MSG:
2109 /* Update link settings according other endpoint's values */
2110
2111 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2112
2113 if ((msg_tol = msg_link_tolerance(msg)) &&
2114 (msg_tol > l_ptr->tolerance))
2115 link_set_supervision_props(l_ptr, msg_tol);
2116
2117 if (msg_linkprio(msg) > l_ptr->priority)
2118 l_ptr->priority = msg_linkprio(msg);
2119
2120 max_pkt_info = msg_max_pkt(msg);
2121 if (max_pkt_info) {
2122 if (max_pkt_info < l_ptr->max_pkt_target)
2123 l_ptr->max_pkt_target = max_pkt_info;
2124 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2125 l_ptr->max_pkt = l_ptr->max_pkt_target;
2126 } else {
2127 l_ptr->max_pkt = l_ptr->max_pkt_target;
2128 }
2129 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2130
2131 link_state_event(l_ptr, msg_type(msg));
2132
2133 l_ptr->peer_session = msg_session(msg);
2134 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2135
2136 /* Synchronize broadcast sequence numbers */
4323add6 2137 if (!tipc_node_has_redundant_links(l_ptr->owner)) {
b97bf3fd
PL		 2138 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2139 }
2140 break;
2141 case STATE_MSG:
2142
2143 if ((msg_tol = msg_link_tolerance(msg)))
2144 link_set_supervision_props(l_ptr, msg_tol);
2145
2146 if (msg_linkprio(msg) &&
2147 (msg_linkprio(msg) != l_ptr->priority)) {
2148 warn("Changing prio <%s>: %u->%u\n",
2149 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2150 l_ptr->priority = msg_linkprio(msg);
4323add6 2151 tipc_link_reset(l_ptr); /* Enforce change to take effect */
b97bf3fd
PL		 2152 break;
2153 }
2154 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2155 l_ptr->stats.recv_states++;
2156 if (link_reset_unknown(l_ptr))
2157 break;
2158
2159 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2160 rec_gap = mod(msg_next_sent(msg) -
2161 mod(l_ptr->next_in_no));
2162 }
2163
2164 max_pkt_ack = msg_max_pkt(msg);
2165 if (max_pkt_ack > l_ptr->max_pkt) {
2166 dbg("Link <%s> updated MTU %u -> %u\n",
2167 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2168 l_ptr->max_pkt = max_pkt_ack;
2169 l_ptr->max_pkt_probes = 0;
2170 }
2171
2172 max_pkt_ack = 0;
2173 if (msg_probe(msg)) {
2174 l_ptr->stats.recv_probes++;
2175 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2176 max_pkt_ack = msg_size(msg);
2177 }
2178 }
2179
2180 /* Protocol message before retransmits, reduce loss risk */
2181
4323add6 2182 tipc_bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
b97bf3fd
PL		 2183
2184 if (rec_gap || (msg_probe(msg))) {
4323add6
PL		 2185 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2186 0, rec_gap, 0, 0, max_pkt_ack);
b97bf3fd
PL		 2187 }
2188 if (msg_seq_gap(msg)) {
2189 msg_dbg(msg, "With Gap:");
2190 l_ptr->stats.recv_nacks++;
4323add6
PL		 2191 tipc_link_retransmit(l_ptr, l_ptr->first_out,
2192 msg_seq_gap(msg));
b97bf3fd
PL		 2193 }
2194 break;
2195 default:
2196 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2197 }
2198exit:
2199 buf_discard(buf);
2200}
2201
2202
2203/*
4323add6 2204 * tipc_link_tunnel(): Send one message via a link belonging to
b97bf3fd
PL		 2205 * another bearer. Owner node is locked.
2206 */
4323add6
PL		 2207void tipc_link_tunnel(struct link *l_ptr,
2208 struct tipc_msg *tunnel_hdr,
2209 struct tipc_msg *msg,
2210 u32 selector)
b97bf3fd
PL		 2211{
2212 struct link *tunnel;
2213 struct sk_buff *buf;
2214 u32 length = msg_size(msg);
2215
2216 tunnel = l_ptr->owner->active_links[selector & 1];
4323add6 2217 if (!tipc_link_is_up(tunnel))
b97bf3fd
PL		 2218 return;
2219 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2220 buf = buf_acquire(length + INT_H_SIZE);
2221 if (!buf)
2222 return;
2223 memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
2224 memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
2225 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2226 msg_dbg(buf_msg(buf), ">SEND>");
2227 assert(tunnel);
4323add6 2228 tipc_link_send_buf(tunnel, buf);
b97bf3fd
PL		 2229}
2230
2231
2232
2233/*
2234 * changeover(): Send whole message queue via the remaining link
2235 * Owner node is locked.
2236 */
2237
4323add6 2238void tipc_link_changeover(struct link *l_ptr)
b97bf3fd
PL		 2239{
2240 u32 msgcount = l_ptr->out_queue_size;
2241 struct sk_buff *crs = l_ptr->first_out;
2242 struct link *tunnel = l_ptr->owner->active_links[0];
4323add6 2243 int split_bundles = tipc_node_has_redundant_links(l_ptr->owner);
b97bf3fd
PL		 2244 struct tipc_msg tunnel_hdr;
2245
2246 if (!tunnel)
2247 return;
2248
2249 if (!l_ptr->owner->permit_changeover)
2250 return;
2251
2252 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2253 ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2254 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2255 msg_set_msgcnt(&tunnel_hdr, msgcount);
2256 if (!l_ptr->first_out) {
2257 struct sk_buff *buf;
2258
2259 assert(!msgcount);
2260 buf = buf_acquire(INT_H_SIZE);
2261 if (buf) {
2262 memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2263 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2264 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2265 tunnel->b_ptr->net_plane);
2266 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
4323add6 2267 tipc_link_send_buf(tunnel, buf);
b97bf3fd
PL		 2268 } else {
2269 warn("Memory squeeze; link changeover failed\n");
2270 }
2271 return;
2272 }
2273 while (crs) {
2274 struct tipc_msg *msg = buf_msg(crs);
2275
2276 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2277 u32 msgcount = msg_msgcnt(msg);
2278 struct tipc_msg *m = msg_get_wrapped(msg);
2279 unchar* pos = (unchar*)m;
2280
2281 while (msgcount--) {
2282 msg_set_seqno(m,msg_seqno(msg));
4323add6
PL		 2283 tipc_link_tunnel(l_ptr, &tunnel_hdr, m,
2284 msg_link_selector(m));
b97bf3fd
PL		 2285 pos += align(msg_size(m));
2286 m = (struct tipc_msg *)pos;
2287 }
2288 } else {
4323add6
PL		 2289 tipc_link_tunnel(l_ptr, &tunnel_hdr, msg,
2290 msg_link_selector(msg));
b97bf3fd
PL		 2291 }
2292 crs = crs->next;
2293 }
2294}
2295
4323add6 2296void tipc_link_send_duplicate(struct link *l_ptr, struct link *tunnel)
b97bf3fd
PL		 2297{
2298 struct sk_buff *iter;
2299 struct tipc_msg tunnel_hdr;
2300
2301 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2302 DUPLICATE_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2303 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2304 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2305 iter = l_ptr->first_out;
2306 while (iter) {
2307 struct sk_buff *outbuf;
2308 struct tipc_msg *msg = buf_msg(iter);
2309 u32 length = msg_size(msg);
2310
2311 if (msg_user(msg) == MSG_BUNDLER)
2312 msg_set_type(msg, CLOSED_MSG);
2313 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2314 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2315 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2316 outbuf = buf_acquire(length + INT_H_SIZE);
2317 if (outbuf == NULL) {
2318 warn("Memory squeeze; buffer duplication failed\n");
2319 return;
2320 }
2321 memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2322 memcpy(outbuf->data + INT_H_SIZE, iter->data, length);
2323 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2324 tunnel->b_ptr->net_plane);
2325 msg_dbg(buf_msg(outbuf), ">SEND>");
4323add6
PL		 2326 tipc_link_send_buf(tunnel, outbuf);
2327 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2328 return;
2329 iter = iter->next;
2330 }
2331}
2332
2333
2334
2335/**
2336 * buf_extract - extracts embedded TIPC message from another message
2337 * @skb: encapsulating message buffer
2338 * @from_pos: offset to extract from
2339 *
2340 * Returns a new message buffer containing an embedded message. The
2341 * encapsulating message itself is left unchanged.
2342 */
2343
2344static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2345{
2346 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2347 u32 size = msg_size(msg);
2348 struct sk_buff *eb;
2349
2350 eb = buf_acquire(size);
2351 if (eb)
2352 memcpy(eb->data, (unchar *)msg, size);
2353 return eb;
2354}
2355
2356/*
2357 * link_recv_changeover_msg(): Receive tunneled packet sent
2358 * via other link. Node is locked. Return extracted buffer.
2359 */
2360
2361static int link_recv_changeover_msg(struct link **l_ptr,
2362 struct sk_buff **buf)
2363{
2364 struct sk_buff *tunnel_buf = *buf;
2365 struct link *dest_link;
2366 struct tipc_msg *msg;
2367 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2368 u32 msg_typ = msg_type(tunnel_msg);
2369 u32 msg_count = msg_msgcnt(tunnel_msg);
2370
2371 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
2372 assert(dest_link != *l_ptr);
2373 if (!dest_link) {
2374 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2375 goto exit;
2376 }
2377 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2378 (*l_ptr)->b_ptr->net_plane);
2379 *l_ptr = dest_link;
2380 msg = msg_get_wrapped(tunnel_msg);
2381
2382 if (msg_typ == DUPLICATE_MSG) {
2383 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2384 msg_dbg(tunnel_msg, "DROP/<REC<");
2385 goto exit;
2386 }
2387 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2388 if (*buf == NULL) {
2389 warn("Memory squeeze; failed to extract msg\n");
2390 goto exit;
2391 }
2392 msg_dbg(tunnel_msg, "TNL<REC<");
2393 buf_discard(tunnel_buf);
2394 return 1;
2395 }
2396
2397 /* First original message ?: */
2398
4323add6 2399 if (tipc_link_is_up(dest_link)) {
b97bf3fd 2400 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
4323add6 2401 tipc_link_reset(dest_link);
b97bf3fd
PL		 2402 dest_link->exp_msg_count = msg_count;
2403 if (!msg_count)
2404 goto exit;
2405 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2406 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2407 dest_link->exp_msg_count = msg_count;
2408 if (!msg_count)
2409 goto exit;
2410 }
2411
2412 /* Receive original message */
2413
2414 if (dest_link->exp_msg_count == 0) {
2415 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2416 dbg_print_link(dest_link, "LINK:");
2417 goto exit;
2418 }
2419 dest_link->exp_msg_count--;
2420 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2421 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2422 goto exit;
2423 } else {
2424 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2425 if (*buf != NULL) {
2426 msg_dbg(tunnel_msg, "TNL<REC<");
2427 buf_discard(tunnel_buf);
2428 return 1;
2429 } else {
2430 warn("Memory squeeze; dropped incoming msg\n");
2431 }
2432 }
2433exit:
1fc54d8f 2434 *buf = NULL;
b97bf3fd
PL		 2435 buf_discard(tunnel_buf);
2436 return 0;
2437}
2438
2439/*
2440 * Bundler functionality:
2441 */
4323add6 2442void tipc_link_recv_bundle(struct sk_buff *buf)
b97bf3fd
PL		 2443{
2444 u32 msgcount = msg_msgcnt(buf_msg(buf));
2445 u32 pos = INT_H_SIZE;
2446 struct sk_buff *obuf;
2447
2448 msg_dbg(buf_msg(buf), "<BNDL<: ");
2449 while (msgcount--) {
2450 obuf = buf_extract(buf, pos);
2451 if (obuf == NULL) {
2452 char addr_string[16];
2453
2454 warn("Buffer allocation failure;\n");
2455 warn(" incoming message(s) from %s lost\n",
2456 addr_string_fill(addr_string,
2457 msg_orignode(buf_msg(buf))));
2458 return;
2459 };
2460 pos += align(msg_size(buf_msg(obuf)));
2461 msg_dbg(buf_msg(obuf), " /");
4323add6 2462 tipc_net_route_msg(obuf);
b97bf3fd
PL		 2463 }
2464 buf_discard(buf);
2465}
2466
2467/*
2468 * Fragmentation/defragmentation:
2469 */
2470
2471
2472/*
4323add6 2473 * tipc_link_send_long_buf: Entry for buffers needing fragmentation.
b97bf3fd
PL		 2474 * The buffer is complete, inclusive total message length.
2475 * Returns user data length.
2476 */
4323add6 2477int tipc_link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
b97bf3fd
PL		 2478{
2479 struct tipc_msg *inmsg = buf_msg(buf);
2480 struct tipc_msg fragm_hdr;
2481 u32 insize = msg_size(inmsg);
2482 u32 dsz = msg_data_sz(inmsg);
2483 unchar *crs = buf->data;
2484 u32 rest = insize;
2485 u32 pack_sz = link_max_pkt(l_ptr);
2486 u32 fragm_sz = pack_sz - INT_H_SIZE;
2487 u32 fragm_no = 1;
2488 u32 destaddr = msg_destnode(inmsg);
2489
2490 if (msg_short(inmsg))
2491 destaddr = l_ptr->addr;
2492
2493 if (msg_routed(inmsg))
2494 msg_set_prevnode(inmsg, tipc_own_addr);
2495
2496 /* Prepare reusable fragment header: */
2497
2498 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2499 TIPC_OK, INT_H_SIZE, destaddr);
2500 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2501 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2502 msg_set_fragm_no(&fragm_hdr, fragm_no);
2503 l_ptr->stats.sent_fragmented++;
2504
2505 /* Chop up message: */
2506
2507 while (rest > 0) {
2508 struct sk_buff *fragm;
2509
2510 if (rest <= fragm_sz) {
2511 fragm_sz = rest;
2512 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2513 }
2514 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2515 if (fragm == NULL) {
2516 warn("Memory squeeze; failed to fragment msg\n");
2517 dsz = -ENOMEM;
2518 goto exit;
2519 }
2520 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2521 memcpy(fragm->data, (unchar *)&fragm_hdr, INT_H_SIZE);
2522 memcpy(fragm->data + INT_H_SIZE, crs, fragm_sz);
2523
2524 /* Send queued messages first, if any: */
2525
2526 l_ptr->stats.sent_fragments++;
4323add6
PL		 2527 tipc_link_send_buf(l_ptr, fragm);
2528 if (!tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2529 return dsz;
2530 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2531 rest -= fragm_sz;
2532 crs += fragm_sz;
2533 msg_set_type(&fragm_hdr, FRAGMENT);
2534 }
2535exit:
2536 buf_discard(buf);
2537 return dsz;
2538}
2539
2540/*
2541 * A pending message being re-assembled must store certain values
2542 * to handle subsequent fragments correctly. The following functions
2543 * help storing these values in unused, available fields in the
2544 * pending message. This makes dynamic memory allocation unecessary.
2545 */
2546
05790c64 2547static void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
b97bf3fd
PL		 2548{
2549 msg_set_seqno(buf_msg(buf), seqno);
2550}
2551
05790c64 2552static u32 get_fragm_size(struct sk_buff *buf)
b97bf3fd
PL		 2553{
2554 return msg_ack(buf_msg(buf));
2555}
2556
05790c64 2557static void set_fragm_size(struct sk_buff *buf, u32 sz)
b97bf3fd
PL		 2558{
2559 msg_set_ack(buf_msg(buf), sz);
2560}
2561
05790c64 2562static u32 get_expected_frags(struct sk_buff *buf)
b97bf3fd
PL		 2563{
2564 return msg_bcast_ack(buf_msg(buf));
2565}
2566
05790c64 2567static void set_expected_frags(struct sk_buff *buf, u32 exp)
b97bf3fd
PL		 2568{
2569 msg_set_bcast_ack(buf_msg(buf), exp);
2570}
2571
05790c64 2572static u32 get_timer_cnt(struct sk_buff *buf)
b97bf3fd
PL		 2573{
2574 return msg_reroute_cnt(buf_msg(buf));
2575}
2576
05790c64 2577static void incr_timer_cnt(struct sk_buff *buf)
b97bf3fd
PL		 2578{
2579 msg_incr_reroute_cnt(buf_msg(buf));
2580}
2581
2582/*
4323add6 2583 * tipc_link_recv_fragment(): Called with node lock on. Returns
b97bf3fd
PL		 2584 * the reassembled buffer if message is complete.
2585 */
4323add6
PL		 2586int tipc_link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2587 struct tipc_msg **m)
b97bf3fd 2588{
1fc54d8f 2589 struct sk_buff *prev = NULL;
b97bf3fd
PL		 2590 struct sk_buff *fbuf = *fb;
2591 struct tipc_msg *fragm = buf_msg(fbuf);
2592 struct sk_buff *pbuf = *pending;
2593 u32 long_msg_seq_no = msg_long_msgno(fragm);
2594
1fc54d8f 2595 *fb = NULL;
b97bf3fd
PL		 2596 msg_dbg(fragm,"FRG<REC<");
2597
2598 /* Is there an incomplete message waiting for this fragment? */
2599
2600 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no)
2601 || (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2602 prev = pbuf;
2603 pbuf = pbuf->next;
2604 }
2605
2606 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2607 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2608 u32 msg_sz = msg_size(imsg);
2609 u32 fragm_sz = msg_data_sz(fragm);
2610 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2611 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2612 if (msg_type(imsg) == TIPC_MCAST_MSG)
2613 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2614 if (msg_size(imsg) > max) {
2615 msg_dbg(fragm,"<REC<Oversized: ");
2616 buf_discard(fbuf);
2617 return 0;
2618 }
2619 pbuf = buf_acquire(msg_size(imsg));
2620 if (pbuf != NULL) {
2621 pbuf->next = *pending;
2622 *pending = pbuf;
2623 memcpy(pbuf->data, (unchar *)imsg, msg_data_sz(fragm));
2624
2625 /* Prepare buffer for subsequent fragments. */
2626
2627 set_long_msg_seqno(pbuf, long_msg_seq_no);
2628 set_fragm_size(pbuf,fragm_sz);
2629 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2630 } else {
2631 warn("Memory squeeze; got no defragmenting buffer\n");
2632 }
2633 buf_discard(fbuf);
2634 return 0;
2635 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2636 u32 dsz = msg_data_sz(fragm);
2637 u32 fsz = get_fragm_size(pbuf);
2638 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2639 u32 exp_frags = get_expected_frags(pbuf) - 1;
2640 memcpy(pbuf->data + crs, msg_data(fragm), dsz);
2641 buf_discard(fbuf);
2642
2643 /* Is message complete? */
2644
2645 if (exp_frags == 0) {
2646 if (prev)
2647 prev->next = pbuf->next;
2648 else
2649 *pending = pbuf->next;
2650 msg_reset_reroute_cnt(buf_msg(pbuf));
2651 *fb = pbuf;
2652 *m = buf_msg(pbuf);
2653 return 1;
2654 }
2655 set_expected_frags(pbuf,exp_frags);
2656 return 0;
2657 }
2658 dbg(" Discarding orphan fragment %x\n",fbuf);
2659 msg_dbg(fragm,"ORPHAN:");
2660 dbg("Pending long buffers:\n");
2661 dbg_print_buf_chain(*pending);
2662 buf_discard(fbuf);
2663 return 0;
2664}
2665
2666/**
2667 * link_check_defragm_bufs - flush stale incoming message fragments
2668 * @l_ptr: pointer to link
2669 */
2670
2671static void link_check_defragm_bufs(struct link *l_ptr)
2672{
1fc54d8f
SR		 2673 struct sk_buff *prev = NULL;
2674 struct sk_buff *next = NULL;
b97bf3fd
PL		 2675 struct sk_buff *buf = l_ptr->defragm_buf;
2676
2677 if (!buf)
2678 return;
2679 if (!link_working_working(l_ptr))
2680 return;
2681 while (buf) {
2682 u32 cnt = get_timer_cnt(buf);
2683
2684 next = buf->next;
2685 if (cnt < 4) {
2686 incr_timer_cnt(buf);
2687 prev = buf;
2688 } else {
2689 dbg(" Discarding incomplete long buffer\n");
2690 msg_dbg(buf_msg(buf), "LONG:");
2691 dbg_print_link(l_ptr, "curr:");
2692 dbg("Pending long buffers:\n");
2693 dbg_print_buf_chain(l_ptr->defragm_buf);
2694 if (prev)
2695 prev->next = buf->next;
2696 else
2697 l_ptr->defragm_buf = buf->next;
2698 buf_discard(buf);
2699 }
2700 buf = next;
2701 }
2702}
2703
2704
2705
2706static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2707{
2708 l_ptr->tolerance = tolerance;
2709 l_ptr->continuity_interval =
2710 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2711 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2712}
2713
2714
4323add6 2715void tipc_link_set_queue_limits(struct link *l_ptr, u32 window)
b97bf3fd
PL		 2716{
2717 /* Data messages from this node, inclusive FIRST_FRAGM */
2718 l_ptr->queue_limit[DATA_LOW] = window;
2719 l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
2720 l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
2721 l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
2722 /* Transiting data messages,inclusive FIRST_FRAGM */
2723 l_ptr->queue_limit[DATA_LOW + 4] = 300;
2724 l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
2725 l_ptr->queue_limit[DATA_HIGH + 4] = 900;
2726 l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
2727 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2728 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2729 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2730 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2731 /* FRAGMENT and LAST_FRAGMENT packets */
2732 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2733}
2734
2735/**
2736 * link_find_link - locate link by name
2737 * @name - ptr to link name string
2738 * @node - ptr to area to be filled with ptr to associated node
2739 *
4323add6 2740 * Caller must hold 'tipc_net_lock' to ensure node and bearer are not deleted;
b97bf3fd
PL		 2741 * this also prevents link deletion.
2742 *
2743 * Returns pointer to link (or 0 if invalid link name).
2744 */
2745
2746static struct link *link_find_link(const char *name, struct node **node)
2747{
2748 struct link_name link_name_parts;
2749 struct bearer *b_ptr;
2750 struct link *l_ptr;
2751
2752 if (!link_name_validate(name, &link_name_parts))
1fc54d8f 2753 return NULL;
b97bf3fd 2754
4323add6 2755 b_ptr = tipc_bearer_find_interface(link_name_parts.if_local);
b97bf3fd 2756 if (!b_ptr)
1fc54d8f 2757 return NULL;
b97bf3fd 2758
4323add6 2759 *node = tipc_node_find(link_name_parts.addr_peer);
b97bf3fd 2760 if (!*node)
1fc54d8f 2761 return NULL;
b97bf3fd
PL		 2762
2763 l_ptr = (*node)->links[b_ptr->identity];
2764 if (!l_ptr || strcmp(l_ptr->name, name))
1fc54d8f 2765 return NULL;
b97bf3fd
PL		 2766
2767 return l_ptr;
2768}
2769
4323add6
PL		 2770struct sk_buff *tipc_link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2771 u16 cmd)
b97bf3fd
PL		 2772{
2773 struct tipc_link_config *args;
2774 u32 new_value;
2775 struct link *l_ptr;
2776 struct node *node;
2777 int res;
2778
2779 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
4323add6 2780 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd
PL		 2781
2782 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2783 new_value = ntohl(args->value);
2784
4323add6 2785 if (!strcmp(args->name, tipc_bclink_name)) {
b97bf3fd 2786 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
4323add6
PL		 2787 (tipc_bclink_set_queue_limits(new_value) == 0))
2788 return tipc_cfg_reply_none();
2789 return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2790 " (cannot change setting on broadcast link)");
b97bf3fd
PL		 2791 }
2792
4323add6 2793 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 2794 l_ptr = link_find_link(args->name, &node);
2795 if (!l_ptr) {
4323add6
PL		 2796 read_unlock_bh(&tipc_net_lock);
2797 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 2798 }
2799
4323add6 2800 tipc_node_lock(node);
b97bf3fd
PL		 2801 res = -EINVAL;
2802 switch (cmd) {
2803 case TIPC_CMD_SET_LINK_TOL:
2804 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2805 (new_value <= TIPC_MAX_LINK_TOL)) {
2806 link_set_supervision_props(l_ptr, new_value);
4323add6
PL		 2807 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2808 0, 0, new_value, 0, 0);
b97bf3fd
PL		 2809 res = TIPC_OK;
2810 }
2811 break;
2812 case TIPC_CMD_SET_LINK_PRI:
16cb4b33
PL		 2813 if ((new_value >= TIPC_MIN_LINK_PRI) &&
2814 (new_value <= TIPC_MAX_LINK_PRI)) {
b97bf3fd 2815 l_ptr->priority = new_value;
4323add6
PL		 2816 tipc_link_send_proto_msg(l_ptr, STATE_MSG,
2817 0, 0, 0, new_value, 0);
b97bf3fd
PL		 2818 res = TIPC_OK;
2819 }
2820 break;
2821 case TIPC_CMD_SET_LINK_WINDOW:
2822 if ((new_value >= TIPC_MIN_LINK_WIN) &&
2823 (new_value <= TIPC_MAX_LINK_WIN)) {
4323add6 2824 tipc_link_set_queue_limits(l_ptr, new_value);
b97bf3fd
PL		 2825 res = TIPC_OK;
2826 }
2827 break;
2828 }
4323add6 2829 tipc_node_unlock(node);
b97bf3fd 2830
4323add6 2831 read_unlock_bh(&tipc_net_lock);
b97bf3fd 2832 if (res)
4323add6 2833 return tipc_cfg_reply_error_string("cannot change link setting");
b97bf3fd 2834
4323add6 2835 return tipc_cfg_reply_none();
b97bf3fd
PL		 2836}
2837
2838/**
2839 * link_reset_statistics - reset link statistics
2840 * @l_ptr: pointer to link
2841 */
2842
2843static void link_reset_statistics(struct link *l_ptr)
2844{
2845 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2846 l_ptr->stats.sent_info = l_ptr->next_out_no;
2847 l_ptr->stats.recv_info = l_ptr->next_in_no;
2848}
2849
4323add6 2850struct sk_buff *tipc_link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
b97bf3fd
PL		 2851{
2852 char *link_name;
2853 struct link *l_ptr;
2854 struct node *node;
2855
2856 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
4323add6 2857 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd
PL		 2858
2859 link_name = (char *)TLV_DATA(req_tlv_area);
4323add6
PL		 2860 if (!strcmp(link_name, tipc_bclink_name)) {
2861 if (tipc_bclink_reset_stats())
2862 return tipc_cfg_reply_error_string("link not found");
2863 return tipc_cfg_reply_none();
b97bf3fd
PL		 2864 }
2865
4323add6 2866 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 2867 l_ptr = link_find_link(link_name, &node);
2868 if (!l_ptr) {
4323add6
PL		 2869 read_unlock_bh(&tipc_net_lock);
2870 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 2871 }
2872
4323add6 2873 tipc_node_lock(node);
b97bf3fd 2874 link_reset_statistics(l_ptr);
4323add6
PL		 2875 tipc_node_unlock(node);
2876 read_unlock_bh(&tipc_net_lock);
2877 return tipc_cfg_reply_none();
b97bf3fd
PL		 2878}
2879
2880/**
2881 * percent - convert count to a percentage of total (rounding up or down)
2882 */
2883
2884static u32 percent(u32 count, u32 total)
2885{
2886 return (count * 100 + (total / 2)) / total;
2887}
2888
2889/**
4323add6 2890 * tipc_link_stats - print link statistics
b97bf3fd
PL		 2891 * @name: link name
2892 * @buf: print buffer area
2893 * @buf_size: size of print buffer area
2894 *
2895 * Returns length of print buffer data string (or 0 if error)
2896 */
2897
4323add6 2898static int tipc_link_stats(const char *name, char *buf, const u32 buf_size)
b97bf3fd
PL		 2899{
2900 struct print_buf pb;
2901 struct link *l_ptr;
2902 struct node *node;
2903 char *status;
2904 u32 profile_total = 0;
2905
4323add6
PL		 2906 if (!strcmp(name, tipc_bclink_name))
2907 return tipc_bclink_stats(buf, buf_size);
b97bf3fd 2908
4323add6 2909 tipc_printbuf_init(&pb, buf, buf_size);
b97bf3fd 2910
4323add6 2911 read_lock_bh(&tipc_net_lock);
b97bf3fd
PL		 2912 l_ptr = link_find_link(name, &node);
2913 if (!l_ptr) {
4323add6 2914 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 2915 return 0;
2916 }
4323add6 2917 tipc_node_lock(node);
b97bf3fd 2918
4323add6 2919 if (tipc_link_is_active(l_ptr))
b97bf3fd 2920 status = "ACTIVE";
4323add6 2921 else if (tipc_link_is_up(l_ptr))
b97bf3fd
PL		 2922 status = "STANDBY";
2923 else
2924 status = "DEFUNCT";
2925 tipc_printf(&pb, "Link <%s>\n"
2926 " %s MTU:%u Priority:%u Tolerance:%u ms"
2927 " Window:%u packets\n",
2928 l_ptr->name, status, link_max_pkt(l_ptr),
2929 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
2930 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
2931 l_ptr->next_in_no - l_ptr->stats.recv_info,
2932 l_ptr->stats.recv_fragments,
2933 l_ptr->stats.recv_fragmented,
2934 l_ptr->stats.recv_bundles,
2935 l_ptr->stats.recv_bundled);
2936 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
2937 l_ptr->next_out_no - l_ptr->stats.sent_info,
2938 l_ptr->stats.sent_fragments,
2939 l_ptr->stats.sent_fragmented,
2940 l_ptr->stats.sent_bundles,
2941 l_ptr->stats.sent_bundled);
2942 profile_total = l_ptr->stats.msg_length_counts;
2943 if (!profile_total)
2944 profile_total = 1;
2945 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
2946 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2947 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
2948 l_ptr->stats.msg_length_counts,
2949 l_ptr->stats.msg_lengths_total / profile_total,
2950 percent(l_ptr->stats.msg_length_profile[0], profile_total),
2951 percent(l_ptr->stats.msg_length_profile[1], profile_total),
2952 percent(l_ptr->stats.msg_length_profile[2], profile_total),
2953 percent(l_ptr->stats.msg_length_profile[3], profile_total),
2954 percent(l_ptr->stats.msg_length_profile[4], profile_total),
2955 percent(l_ptr->stats.msg_length_profile[5], profile_total),
2956 percent(l_ptr->stats.msg_length_profile[6], profile_total));
2957 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
2958 l_ptr->stats.recv_states,
2959 l_ptr->stats.recv_probes,
2960 l_ptr->stats.recv_nacks,
2961 l_ptr->stats.deferred_recv,
2962 l_ptr->stats.duplicates);
2963 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
2964 l_ptr->stats.sent_states,
2965 l_ptr->stats.sent_probes,
2966 l_ptr->stats.sent_nacks,
2967 l_ptr->stats.sent_acks,
2968 l_ptr->stats.retransmitted);
2969 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
2970 l_ptr->stats.bearer_congs,
2971 l_ptr->stats.link_congs,
2972 l_ptr->stats.max_queue_sz,
2973 l_ptr->stats.queue_sz_counts
2974 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
2975 : 0);
2976
4323add6
PL		 2977 tipc_node_unlock(node);
2978 read_unlock_bh(&tipc_net_lock);
2979 return tipc_printbuf_validate(&pb);
b97bf3fd
PL		 2980}
2981
2982#define MAX_LINK_STATS_INFO 2000
2983
4323add6 2984struct sk_buff *tipc_link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
b97bf3fd
PL		 2985{
2986 struct sk_buff *buf;
2987 struct tlv_desc *rep_tlv;
2988 int str_len;
2989
2990 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
4323add6 2991 return tipc_cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
b97bf3fd 2992
4323add6 2993 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
b97bf3fd
PL		 2994 if (!buf)
2995 return NULL;
2996
2997 rep_tlv = (struct tlv_desc *)buf->data;
2998
4323add6
PL		 2999 str_len = tipc_link_stats((char *)TLV_DATA(req_tlv_area),
3000 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
b97bf3fd
PL		 3001 if (!str_len) {
3002 buf_discard(buf);
4323add6 3003 return tipc_cfg_reply_error_string("link not found");
b97bf3fd
PL		 3004 }
3005
3006 skb_put(buf, TLV_SPACE(str_len));
3007 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3008
3009 return buf;
3010}
3011
3012#if 0
3013int link_control(const char *name, u32 op, u32 val)
3014{
3015 int res = -EINVAL;
3016 struct link *l_ptr;
3017 u32 bearer_id;
3018 struct node * node;
3019 u32 a;
3020
3021 a = link_name2addr(name, &bearer_id);
4323add6
PL		 3022 read_lock_bh(&tipc_net_lock);
3023 node = tipc_node_find(a);
b97bf3fd 3024 if (node) {
4323add6 3025 tipc_node_lock(node);
b97bf3fd
PL		 3026 l_ptr = node->links[bearer_id];
3027 if (l_ptr) {
3028 if (op == TIPC_REMOVE_LINK) {
3029 struct bearer *b_ptr = l_ptr->b_ptr;
3030 spin_lock_bh(&b_ptr->publ.lock);
4323add6 3031 tipc_link_delete(l_ptr);
b97bf3fd
PL		 3032 spin_unlock_bh(&b_ptr->publ.lock);
3033 }
3034 if (op == TIPC_CMD_BLOCK_LINK) {
4323add6 3035 tipc_link_reset(l_ptr);
b97bf3fd
PL		 3036 l_ptr->blocked = 1;
3037 }
3038 if (op == TIPC_CMD_UNBLOCK_LINK) {
3039 l_ptr->blocked = 0;
3040 }
3041 res = TIPC_OK;
3042 }
4323add6 3043 tipc_node_unlock(node);
b97bf3fd 3044 }
4323add6 3045 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 3046 return res;
3047}
3048#endif
3049
3050/**
4323add6 3051 * tipc_link_get_max_pkt - get maximum packet size to use when sending to destination
b97bf3fd
PL		 3052 * @dest: network address of destination node
3053 * @selector: used to select from set of active links
3054 *
3055 * If no active link can be found, uses default maximum packet size.
3056 */
3057
4323add6 3058u32 tipc_link_get_max_pkt(u32 dest, u32 selector)
b97bf3fd
PL		 3059{
3060 struct node *n_ptr;
3061 struct link *l_ptr;
3062 u32 res = MAX_PKT_DEFAULT;
3063
3064 if (dest == tipc_own_addr)
3065 return MAX_MSG_SIZE;
3066
4323add6
PL		 3067 read_lock_bh(&tipc_net_lock);
3068 n_ptr = tipc_node_select(dest, selector);
b97bf3fd 3069 if (n_ptr) {
4323add6 3070 tipc_node_lock(n_ptr);
b97bf3fd
PL		 3071 l_ptr = n_ptr->active_links[selector & 1];
3072 if (l_ptr)
3073 res = link_max_pkt(l_ptr);
4323add6 3074 tipc_node_unlock(n_ptr);
b97bf3fd 3075 }
4323add6 3076 read_unlock_bh(&tipc_net_lock);
b97bf3fd
PL		 3077 return res;
3078}
3079
3080#if 0
3081static void link_dump_rec_queue(struct link *l_ptr)
3082{
3083 struct sk_buff *crs;
3084
3085 if (!l_ptr->oldest_deferred_in) {
3086 info("Reception queue empty\n");
3087 return;
3088 }
3089 info("Contents of Reception queue:\n");
3090 crs = l_ptr->oldest_deferred_in;
3091 while (crs) {
3092 if (crs->data == (void *)0x0000a3a3) {
3093 info("buffer %x invalid\n", crs);
3094 return;
3095 }
3096 msg_dbg(buf_msg(crs), "In rec queue: \n");
3097 crs = crs->next;
3098 }
3099}
3100#endif
3101
3102static void link_dump_send_queue(struct link *l_ptr)
3103{
3104 if (l_ptr->next_out) {
3105 info("\nContents of unsent queue:\n");
3106 dbg_print_buf_chain(l_ptr->next_out);
3107 }
3108 info("\nContents of send queue:\n");
3109 if (l_ptr->first_out) {
3110 dbg_print_buf_chain(l_ptr->first_out);
3111 }
3112 info("Empty send queue\n");
3113}
3114
3115static void link_print(struct link *l_ptr, struct print_buf *buf,
3116 const char *str)
3117{
3118 tipc_printf(buf, str);
3119 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3120 return;
3121 tipc_printf(buf, "Link %x<%s>:",
3122 l_ptr->addr, l_ptr->b_ptr->publ.name);
3123 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3124 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3125 tipc_printf(buf, "SQUE");
3126 if (l_ptr->first_out) {
3127 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3128 if (l_ptr->next_out)
3129 tipc_printf(buf, "%u..",
3130 msg_seqno(buf_msg(l_ptr->next_out)));
3131 tipc_printf(buf, "%u]",
3132 msg_seqno(buf_msg
3133 (l_ptr->last_out)), l_ptr->out_queue_size);
3134 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3135 msg_seqno(buf_msg(l_ptr->first_out)))
3136 != (l_ptr->out_queue_size - 1))
3137 || (l_ptr->last_out->next != 0)) {
3138 tipc_printf(buf, "\nSend queue inconsistency\n");
3139 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3140 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3141 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3142 link_dump_send_queue(l_ptr);
3143 }
3144 } else
3145 tipc_printf(buf, "[]");
3146 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3147 if (l_ptr->oldest_deferred_in) {
3148 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3149 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3150 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3151 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3152 tipc_printf(buf, ":RQSIZ(%u)",
3153 l_ptr->deferred_inqueue_sz);
3154 }
3155 }
3156 if (link_working_unknown(l_ptr))
3157 tipc_printf(buf, ":WU");
3158 if (link_reset_reset(l_ptr))
3159 tipc_printf(buf, ":RR");
3160 if (link_reset_unknown(l_ptr))
3161 tipc_printf(buf, ":RU");
3162 if (link_working_working(l_ptr))
3163 tipc_printf(buf, ":WW");
3164 tipc_printf(buf, "\n");
3165}
3166
kernel source for telekom puls (alcatel/mediatek)