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diff --git a/net/tipc/link.c b/net/tipc/link.c
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1/*
2 * net/tipc/link.c: TIPC link code
3 *
4 * Copyright (c) 2003-2005, Ericsson Research Canada
5 * Copyright (c) 2004-2005, Wind River Systems
6 * Copyright (c) 2005-2006, Ericsson AB
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * Redistributions of source code must retain the above copyright notice, this
13 * list of conditions and the following disclaimer.
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include "core.h"
35#include "dbg.h"
36#include "link.h"
37#include "net.h"
38#include "node.h"
39#include "port.h"
40#include "addr.h"
41#include "node_subscr.h"
42#include "name_distr.h"
43#include "bearer.h"
44#include "name_table.h"
45#include "discover.h"
46#include "config.h"
47#include "bcast.h"
48
49
50/*
51 * Limit for deferred reception queue:
52 */
53
54#define DEF_QUEUE_LIMIT 256u
55
56/*
57 * Link state events:
58 */
59
60#define STARTING_EVT 856384768 /* link processing trigger */
61#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
62#define TIMEOUT_EVT 560817u /* link timer expired */
63
64/*
65 * The following two 'message types' is really just implementation
66 * data conveniently stored in the message header.
67 * They must not be considered part of the protocol
68 */
69#define OPEN_MSG 0
70#define CLOSED_MSG 1
71
72/*
73 * State value stored in 'exp_msg_count'
74 */
75
76#define START_CHANGEOVER 100000u
77
78/**
79 * struct link_name - deconstructed link name
80 * @addr_local: network address of node at this end
81 * @if_local: name of interface at this end
82 * @addr_peer: network address of node at far end
83 * @if_peer: name of interface at far end
84 */
85
86struct link_name {
87 u32 addr_local;
88 char if_local[TIPC_MAX_IF_NAME];
89 u32 addr_peer;
90 char if_peer[TIPC_MAX_IF_NAME];
91};
92
93#if 0
94
95/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
96
97/**
98 * struct link_event - link up/down event notification
99 */
100
101struct link_event {
102 u32 addr;
103 int up;
104 void (*fcn)(u32, char *, int);
105 char name[TIPC_MAX_LINK_NAME];
106};
107
108#endif
109
110static void link_handle_out_of_seq_msg(struct link *l_ptr,
111 struct sk_buff *buf);
112static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf);
113static int link_recv_changeover_msg(struct link **l_ptr, struct sk_buff **buf);
114static void link_set_supervision_props(struct link *l_ptr, u32 tolerance);
115static int link_send_sections_long(struct port *sender,
116 struct iovec const *msg_sect,
117 u32 num_sect, u32 destnode);
118static void link_check_defragm_bufs(struct link *l_ptr);
119static void link_state_event(struct link *l_ptr, u32 event);
120static void link_reset_statistics(struct link *l_ptr);
121static void link_print(struct link *l_ptr, struct print_buf *buf,
122 const char *str);
123
124/*
125 * Debugging code used by link routines only
126 *
127 * When debugging link problems on a system that has multiple links,
128 * the standard TIPC debugging routines may not be useful since they
129 * allow the output from multiple links to be intermixed. For this reason
130 * routines of the form "dbg_link_XXX()" have been created that will capture
131 * debug info into a link's personal print buffer, which can then be dumped
132 * into the TIPC system log (LOG) upon request.
133 *
134 * To enable per-link debugging, use LINK_LOG_BUF_SIZE to specify the size
135 * of the print buffer used by each link. If LINK_LOG_BUF_SIZE is set to 0,
136 * the dbg_link_XXX() routines simply send their output to the standard
137 * debug print buffer (DBG_OUTPUT), if it has been defined; this can be useful
138 * when there is only a single link in the system being debugged.
139 *
140 * Notes:
141 * - When enabled, LINK_LOG_BUF_SIZE should be set to at least 1000 (bytes)
142 * - "l_ptr" must be valid when using dbg_link_XXX() macros
143 */
144
145#define LINK_LOG_BUF_SIZE 0
146
147#define dbg_link(fmt, arg...) do {if (LINK_LOG_BUF_SIZE) tipc_printf(&l_ptr->print_buf, fmt, ## arg); } while(0)
148#define dbg_link_msg(msg, txt) do {if (LINK_LOG_BUF_SIZE) msg_print(&l_ptr->print_buf, msg, txt); } while(0)
149#define dbg_link_state(txt) do {if (LINK_LOG_BUF_SIZE) link_print(l_ptr, &l_ptr->print_buf, txt); } while(0)
150#define dbg_link_dump() do { \
151 if (LINK_LOG_BUF_SIZE) { \
152 tipc_printf(LOG, "\n\nDumping link <%s>:\n", l_ptr->name); \
153 printbuf_move(LOG, &l_ptr->print_buf); \
154 } \
155} while (0)
156
157static inline void dbg_print_link(struct link *l_ptr, const char *str)
158{
159 if (DBG_OUTPUT)
160 link_print(l_ptr, DBG_OUTPUT, str);
161}
162
163static inline void dbg_print_buf_chain(struct sk_buff *root_buf)
164{
165 if (DBG_OUTPUT) {
166 struct sk_buff *buf = root_buf;
167
168 while (buf) {
169 msg_dbg(buf_msg(buf), "In chain: ");
170 buf = buf->next;
171 }
172 }
173}
174
175/*
176 * Simple inlined link routines
177 */
178
179static inline unsigned int align(unsigned int i)
180{
181 return (i + 3) & ~3u;
182}
183
184static inline int link_working_working(struct link *l_ptr)
185{
186 return (l_ptr->state == WORKING_WORKING);
187}
188
189static inline int link_working_unknown(struct link *l_ptr)
190{
191 return (l_ptr->state == WORKING_UNKNOWN);
192}
193
194static inline int link_reset_unknown(struct link *l_ptr)
195{
196 return (l_ptr->state == RESET_UNKNOWN);
197}
198
199static inline int link_reset_reset(struct link *l_ptr)
200{
201 return (l_ptr->state == RESET_RESET);
202}
203
204static inline int link_blocked(struct link *l_ptr)
205{
206 return (l_ptr->exp_msg_count || l_ptr->blocked);
207}
208
209static inline int link_congested(struct link *l_ptr)
210{
211 return (l_ptr->out_queue_size >= l_ptr->queue_limit[0]);
212}
213
214static inline u32 link_max_pkt(struct link *l_ptr)
215{
216 return l_ptr->max_pkt;
217}
218
219static inline void link_init_max_pkt(struct link *l_ptr)
220{
221 u32 max_pkt;
222
223 max_pkt = (l_ptr->b_ptr->publ.mtu & ~3);
224 if (max_pkt > MAX_MSG_SIZE)
225 max_pkt = MAX_MSG_SIZE;
226
227 l_ptr->max_pkt_target = max_pkt;
228 if (l_ptr->max_pkt_target < MAX_PKT_DEFAULT)
229 l_ptr->max_pkt = l_ptr->max_pkt_target;
230 else
231 l_ptr->max_pkt = MAX_PKT_DEFAULT;
232
233 l_ptr->max_pkt_probes = 0;
234}
235
236static inline u32 link_next_sent(struct link *l_ptr)
237{
238 if (l_ptr->next_out)
239 return msg_seqno(buf_msg(l_ptr->next_out));
240 return mod(l_ptr->next_out_no);
241}
242
243static inline u32 link_last_sent(struct link *l_ptr)
244{
245 return mod(link_next_sent(l_ptr) - 1);
246}
247
248/*
249 * Simple non-inlined link routines (i.e. referenced outside this file)
250 */
251
252int link_is_up(struct link *l_ptr)
253{
254 if (!l_ptr)
255 return 0;
256 return (link_working_working(l_ptr) || link_working_unknown(l_ptr));
257}
258
259int link_is_active(struct link *l_ptr)
260{
261 return ((l_ptr->owner->active_links[0] == l_ptr) ||
262 (l_ptr->owner->active_links[1] == l_ptr));
263}
264
265/**
266 * link_name_validate - validate & (optionally) deconstruct link name
267 * @name - ptr to link name string
268 * @name_parts - ptr to area for link name components (or NULL if not needed)
269 *
270 * Returns 1 if link name is valid, otherwise 0.
271 */
272
273static int link_name_validate(const char *name, struct link_name *name_parts)
274{
275 char name_copy[TIPC_MAX_LINK_NAME];
276 char *addr_local;
277 char *if_local;
278 char *addr_peer;
279 char *if_peer;
280 char dummy;
281 u32 z_local, c_local, n_local;
282 u32 z_peer, c_peer, n_peer;
283 u32 if_local_len;
284 u32 if_peer_len;
285
286 /* copy link name & ensure length is OK */
287
288 name_copy[TIPC_MAX_LINK_NAME - 1] = 0;
289 /* need above in case non-Posix strncpy() doesn't pad with nulls */
290 strncpy(name_copy, name, TIPC_MAX_LINK_NAME);
291 if (name_copy[TIPC_MAX_LINK_NAME - 1] != 0)
292 return 0;
293
294 /* ensure all component parts of link name are present */
295
296 addr_local = name_copy;
297 if ((if_local = strchr(addr_local, ':')) == NULL)
298 return 0;
299 *(if_local++) = 0;
300 if ((addr_peer = strchr(if_local, '-')) == NULL)
301 return 0;
302 *(addr_peer++) = 0;
303 if_local_len = addr_peer - if_local;
304 if ((if_peer = strchr(addr_peer, ':')) == NULL)
305 return 0;
306 *(if_peer++) = 0;
307 if_peer_len = strlen(if_peer) + 1;
308
309 /* validate component parts of link name */
310
311 if ((sscanf(addr_local, "%u.%u.%u%c",
312 &z_local, &c_local, &n_local, &dummy) != 3) ||
313 (sscanf(addr_peer, "%u.%u.%u%c",
314 &z_peer, &c_peer, &n_peer, &dummy) != 3) ||
315 (z_local > 255) || (c_local > 4095) || (n_local > 4095) ||
316 (z_peer > 255) || (c_peer > 4095) || (n_peer > 4095) ||
317 (if_local_len <= 1) || (if_local_len > TIPC_MAX_IF_NAME) ||
318 (if_peer_len <= 1) || (if_peer_len > TIPC_MAX_IF_NAME) ||
319 (strspn(if_local, tipc_alphabet) != (if_local_len - 1)) ||
320 (strspn(if_peer, tipc_alphabet) != (if_peer_len - 1)))
321 return 0;
322
323 /* return link name components, if necessary */
324
325 if (name_parts) {
326 name_parts->addr_local = tipc_addr(z_local, c_local, n_local);
327 strcpy(name_parts->if_local, if_local);
328 name_parts->addr_peer = tipc_addr(z_peer, c_peer, n_peer);
329 strcpy(name_parts->if_peer, if_peer);
330 }
331 return 1;
332}
333
334/**
335 * link_timeout - handle expiration of link timer
336 * @l_ptr: pointer to link
337 *
338 * This routine must not grab "net_lock" to avoid a potential deadlock conflict
339 * with link_delete(). (There is no risk that the node will be deleted by
340 * another thread because link_delete() always cancels the link timer before
341 * node_delete() is called.)
342 */
343
344static void link_timeout(struct link *l_ptr)
345{
346 node_lock(l_ptr->owner);
347
348 /* update counters used in statistical profiling of send traffic */
349
350 l_ptr->stats.accu_queue_sz += l_ptr->out_queue_size;
351 l_ptr->stats.queue_sz_counts++;
352
353 if (l_ptr->out_queue_size > l_ptr->stats.max_queue_sz)
354 l_ptr->stats.max_queue_sz = l_ptr->out_queue_size;
355
356 if (l_ptr->first_out) {
357 struct tipc_msg *msg = buf_msg(l_ptr->first_out);
358 u32 length = msg_size(msg);
359
360 if ((msg_user(msg) == MSG_FRAGMENTER)
361 && (msg_type(msg) == FIRST_FRAGMENT)) {
362 length = msg_size(msg_get_wrapped(msg));
363 }
364 if (length) {
365 l_ptr->stats.msg_lengths_total += length;
366 l_ptr->stats.msg_length_counts++;
367 if (length <= 64)
368 l_ptr->stats.msg_length_profile[0]++;
369 else if (length <= 256)
370 l_ptr->stats.msg_length_profile[1]++;
371 else if (length <= 1024)
372 l_ptr->stats.msg_length_profile[2]++;
373 else if (length <= 4096)
374 l_ptr->stats.msg_length_profile[3]++;
375 else if (length <= 16384)
376 l_ptr->stats.msg_length_profile[4]++;
377 else if (length <= 32768)
378 l_ptr->stats.msg_length_profile[5]++;
379 else
380 l_ptr->stats.msg_length_profile[6]++;
381 }
382 }
383
384 /* do all other link processing performed on a periodic basis */
385
386 link_check_defragm_bufs(l_ptr);
387
388 link_state_event(l_ptr, TIMEOUT_EVT);
389
390 if (l_ptr->next_out)
391 link_push_queue(l_ptr);
392
393 node_unlock(l_ptr->owner);
394}
395
396static inline void link_set_timer(struct link *l_ptr, u32 time)
397{
398 k_start_timer(&l_ptr->timer, time);
399}
400
401/**
402 * link_create - create a new link
403 * @b_ptr: pointer to associated bearer
404 * @peer: network address of node at other end of link
405 * @media_addr: media address to use when sending messages over link
406 *
407 * Returns pointer to link.
408 */
409
410struct link *link_create(struct bearer *b_ptr, const u32 peer,
411 const struct tipc_media_addr *media_addr)
412{
413 struct link *l_ptr;
414 struct tipc_msg *msg;
415 char *if_name;
416
417 l_ptr = (struct link *)kmalloc(sizeof(*l_ptr), GFP_ATOMIC);
418 if (!l_ptr) {
419 warn("Memory squeeze; Failed to create link\n");
420 return NULL;
421 }
422 memset(l_ptr, 0, sizeof(*l_ptr));
423
424 l_ptr->addr = peer;
425 if_name = strchr(b_ptr->publ.name, ':') + 1;
426 sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:",
427 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
428 tipc_node(tipc_own_addr),
429 if_name,
430 tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
431 /* note: peer i/f is appended to link name by reset/activate */
432 memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
433 k_init_timer(&l_ptr->timer, (Handler)link_timeout, (unsigned long)l_ptr);
434 list_add_tail(&l_ptr->link_list, &b_ptr->links);
435 l_ptr->checkpoint = 1;
436 l_ptr->b_ptr = b_ptr;
437 link_set_supervision_props(l_ptr, b_ptr->media->tolerance);
438 l_ptr->state = RESET_UNKNOWN;
439
440 l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
441 msg = l_ptr->pmsg;
442 msg_init(msg, LINK_PROTOCOL, RESET_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
443 msg_set_size(msg, sizeof(l_ptr->proto_msg));
444 msg_set_session(msg, tipc_random);
445 msg_set_bearer_id(msg, b_ptr->identity);
446 strcpy((char *)msg_data(msg), if_name);
447
448 l_ptr->priority = b_ptr->priority;
449 link_set_queue_limits(l_ptr, b_ptr->media->window);
450
451 link_init_max_pkt(l_ptr);
452
453 l_ptr->next_out_no = 1;
454 INIT_LIST_HEAD(&l_ptr->waiting_ports);
455
456 link_reset_statistics(l_ptr);
457
458 l_ptr->owner = node_attach_link(l_ptr);
459 if (!l_ptr->owner) {
460 kfree(l_ptr);
461 return NULL;
462 }
463
464 if (LINK_LOG_BUF_SIZE) {
465 char *pb = kmalloc(LINK_LOG_BUF_SIZE, GFP_ATOMIC);
466
467 if (!pb) {
468 kfree(l_ptr);
469 warn("Memory squeeze; Failed to create link\n");
470 return NULL;
471 }
472 printbuf_init(&l_ptr->print_buf, pb, LINK_LOG_BUF_SIZE);
473 }
474
475 k_signal((Handler)link_start, (unsigned long)l_ptr);
476
477 dbg("link_create(): tolerance = %u,cont intv = %u, abort_limit = %u\n",
478 l_ptr->tolerance, l_ptr->continuity_interval, l_ptr->abort_limit);
479
480 return l_ptr;
481}
482
483/**
484 * link_delete - delete a link
485 * @l_ptr: pointer to link
486 *
487 * Note: 'net_lock' is write_locked, bearer is locked.
488 * This routine must not grab the node lock until after link timer cancellation
489 * to avoid a potential deadlock situation.
490 */
491
492void link_delete(struct link *l_ptr)
493{
494 if (!l_ptr) {
495 err("Attempt to delete non-existent link\n");
496 return;
497 }
498
499 dbg("link_delete()\n");
500
501 k_cancel_timer(&l_ptr->timer);
502
503 node_lock(l_ptr->owner);
504 link_reset(l_ptr);
505 node_detach_link(l_ptr->owner, l_ptr);
506 link_stop(l_ptr);
507 list_del_init(&l_ptr->link_list);
508 if (LINK_LOG_BUF_SIZE)
509 kfree(l_ptr->print_buf.buf);
510 node_unlock(l_ptr->owner);
511 k_term_timer(&l_ptr->timer);
512 kfree(l_ptr);
513}
514
515void link_start(struct link *l_ptr)
516{
517 dbg("link_start %x\n", l_ptr);
518 link_state_event(l_ptr, STARTING_EVT);
519}
520
521/**
522 * link_schedule_port - schedule port for deferred sending
523 * @l_ptr: pointer to link
524 * @origport: reference to sending port
525 * @sz: amount of data to be sent
526 *
527 * Schedules port for renewed sending of messages after link congestion
528 * has abated.
529 */
530
531static int link_schedule_port(struct link *l_ptr, u32 origport, u32 sz)
532{
533 struct port *p_ptr;
534
535 spin_lock_bh(&port_list_lock);
536 p_ptr = port_lock(origport);
537 if (p_ptr) {
538 if (!p_ptr->wakeup)
539 goto exit;
540 if (!list_empty(&p_ptr->wait_list))
541 goto exit;
542 p_ptr->congested_link = l_ptr;
543 p_ptr->publ.congested = 1;
544 p_ptr->waiting_pkts = 1 + ((sz - 1) / link_max_pkt(l_ptr));
545 list_add_tail(&p_ptr->wait_list, &l_ptr->waiting_ports);
546 l_ptr->stats.link_congs++;
547exit:
548 port_unlock(p_ptr);
549 }
550 spin_unlock_bh(&port_list_lock);
551 return -ELINKCONG;
552}
553
554void link_wakeup_ports(struct link *l_ptr, int all)
555{
556 struct port *p_ptr;
557 struct port *temp_p_ptr;
558 int win = l_ptr->queue_limit[0] - l_ptr->out_queue_size;
559
560 if (all)
561 win = 100000;
562 if (win <= 0)
563 return;
564 if (!spin_trylock_bh(&port_list_lock))
565 return;
566 if (link_congested(l_ptr))
567 goto exit;
568 list_for_each_entry_safe(p_ptr, temp_p_ptr, &l_ptr->waiting_ports,
569 wait_list) {
570 if (win <= 0)
571 break;
572 list_del_init(&p_ptr->wait_list);
573 p_ptr->congested_link = 0;
574 assert(p_ptr->wakeup);
575 spin_lock_bh(p_ptr->publ.lock);
576 p_ptr->publ.congested = 0;
577 p_ptr->wakeup(&p_ptr->publ);
578 win -= p_ptr->waiting_pkts;
579 spin_unlock_bh(p_ptr->publ.lock);
580 }
581
582exit:
583 spin_unlock_bh(&port_list_lock);
584}
585
586/**
587 * link_release_outqueue - purge link's outbound message queue
588 * @l_ptr: pointer to link
589 */
590
591static void link_release_outqueue(struct link *l_ptr)
592{
593 struct sk_buff *buf = l_ptr->first_out;
594 struct sk_buff *next;
595
596 while (buf) {
597 next = buf->next;
598 buf_discard(buf);
599 buf = next;
600 }
601 l_ptr->first_out = NULL;
602 l_ptr->out_queue_size = 0;
603}
604
605/**
606 * link_reset_fragments - purge link's inbound message fragments queue
607 * @l_ptr: pointer to link
608 */
609
610void link_reset_fragments(struct link *l_ptr)
611{
612 struct sk_buff *buf = l_ptr->defragm_buf;
613 struct sk_buff *next;
614
615 while (buf) {
616 next = buf->next;
617 buf_discard(buf);
618 buf = next;
619 }
620 l_ptr->defragm_buf = NULL;
621}
622
623/**
624 * link_stop - purge all inbound and outbound messages associated with link
625 * @l_ptr: pointer to link
626 */
627
628void link_stop(struct link *l_ptr)
629{
630 struct sk_buff *buf;
631 struct sk_buff *next;
632
633 buf = l_ptr->oldest_deferred_in;
634 while (buf) {
635 next = buf->next;
636 buf_discard(buf);
637 buf = next;
638 }
639
640 buf = l_ptr->first_out;
641 while (buf) {
642 next = buf->next;
643 buf_discard(buf);
644 buf = next;
645 }
646
647 link_reset_fragments(l_ptr);
648
649 buf_discard(l_ptr->proto_msg_queue);
650 l_ptr->proto_msg_queue = NULL;
651}
652
653#if 0
654
655/* LINK EVENT CODE IS NOT SUPPORTED AT PRESENT */
656
657static void link_recv_event(struct link_event *ev)
658{
659 ev->fcn(ev->addr, ev->name, ev->up);
660 kfree(ev);
661}
662
663static void link_send_event(void (*fcn)(u32 a, char *n, int up),
664 struct link *l_ptr, int up)
665{
666 struct link_event *ev;
667
668 ev = kmalloc(sizeof(*ev), GFP_ATOMIC);
669 if (!ev) {
670 warn("Link event allocation failure\n");
671 return;
672 }
673 ev->addr = l_ptr->addr;
674 ev->up = up;
675 ev->fcn = fcn;
676 memcpy(ev->name, l_ptr->name, TIPC_MAX_LINK_NAME);
677 k_signal((Handler)link_recv_event, (unsigned long)ev);
678}
679
680#else
681
682#define link_send_event(fcn, l_ptr, up) do { } while (0)
683
684#endif
685
686void link_reset(struct link *l_ptr)
687{
688 struct sk_buff *buf;
689 u32 prev_state = l_ptr->state;
690 u32 checkpoint = l_ptr->next_in_no;
691
692 msg_set_session(l_ptr->pmsg, msg_session(l_ptr->pmsg) + 1);
693
694 /* Link is down, accept any session: */
695 l_ptr->peer_session = 0;
696
697 /* Prepare for max packet size negotiation */
698 link_init_max_pkt(l_ptr);
699
700 l_ptr->state = RESET_UNKNOWN;
701 dbg_link_state("Resetting Link\n");
702
703 if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
704 return;
705
706 node_link_down(l_ptr->owner, l_ptr);
707 bearer_remove_dest(l_ptr->b_ptr, l_ptr->addr);
708#if 0
709 tipc_printf(CONS, "\nReset link <%s>\n", l_ptr->name);
710 dbg_link_dump();
711#endif
712 if (node_has_active_links(l_ptr->owner) &&
713 l_ptr->owner->permit_changeover) {
714 l_ptr->reset_checkpoint = checkpoint;
715 l_ptr->exp_msg_count = START_CHANGEOVER;
716 }
717
718 /* Clean up all queues: */
719
720 link_release_outqueue(l_ptr);
721 buf_discard(l_ptr->proto_msg_queue);
722 l_ptr->proto_msg_queue = NULL;
723 buf = l_ptr->oldest_deferred_in;
724 while (buf) {
725 struct sk_buff *next = buf->next;
726 buf_discard(buf);
727 buf = next;
728 }
729 if (!list_empty(&l_ptr->waiting_ports))
730 link_wakeup_ports(l_ptr, 1);
731
732 l_ptr->retransm_queue_head = 0;
733 l_ptr->retransm_queue_size = 0;
734 l_ptr->last_out = NULL;
735 l_ptr->first_out = NULL;
736 l_ptr->next_out = NULL;
737 l_ptr->unacked_window = 0;
738 l_ptr->checkpoint = 1;
739 l_ptr->next_out_no = 1;
740 l_ptr->deferred_inqueue_sz = 0;
741 l_ptr->oldest_deferred_in = NULL;
742 l_ptr->newest_deferred_in = NULL;
743 l_ptr->fsm_msg_cnt = 0;
744 l_ptr->stale_count = 0;
745 link_reset_statistics(l_ptr);
746
747 link_send_event(cfg_link_event, l_ptr, 0);
748 if (!in_own_cluster(l_ptr->addr))
749 link_send_event(disc_link_event, l_ptr, 0);
750}
751
752
753static void link_activate(struct link *l_ptr)
754{
755 l_ptr->next_in_no = 1;
756 node_link_up(l_ptr->owner, l_ptr);
757 bearer_add_dest(l_ptr->b_ptr, l_ptr->addr);
758 link_send_event(cfg_link_event, l_ptr, 1);
759 if (!in_own_cluster(l_ptr->addr))
760 link_send_event(disc_link_event, l_ptr, 1);
761}
762
763/**
764 * link_state_event - link finite state machine
765 * @l_ptr: pointer to link
766 * @event: state machine event to process
767 */
768
769static void link_state_event(struct link *l_ptr, unsigned event)
770{
771 struct link *other;
772 u32 cont_intv = l_ptr->continuity_interval;
773
774 if (!l_ptr->started && (event != STARTING_EVT))
775 return; /* Not yet. */
776
777 if (link_blocked(l_ptr)) {
778 if (event == TIMEOUT_EVT) {
779 link_set_timer(l_ptr, cont_intv);
780 }
781 return; /* Changeover going on */
782 }
783 dbg_link("STATE_EV: <%s> ", l_ptr->name);
784
785 switch (l_ptr->state) {
786 case WORKING_WORKING:
787 dbg_link("WW/");
788 switch (event) {
789 case TRAFFIC_MSG_EVT:
790 dbg_link("TRF-");
791 /* fall through */
792 case ACTIVATE_MSG:
793 dbg_link("ACT\n");
794 break;
795 case TIMEOUT_EVT:
796 dbg_link("TIM ");
797 if (l_ptr->next_in_no != l_ptr->checkpoint) {
798 l_ptr->checkpoint = l_ptr->next_in_no;
799 if (bclink_acks_missing(l_ptr->owner)) {
800 link_send_proto_msg(l_ptr, STATE_MSG,
801 0, 0, 0, 0, 0);
802 l_ptr->fsm_msg_cnt++;
803 } else if (l_ptr->max_pkt < l_ptr->max_pkt_target) {
804 link_send_proto_msg(l_ptr, STATE_MSG,
805 1, 0, 0, 0, 0);
806 l_ptr->fsm_msg_cnt++;
807 }
808 link_set_timer(l_ptr, cont_intv);
809 break;
810 }
811 dbg_link(" -> WU\n");
812 l_ptr->state = WORKING_UNKNOWN;
813 l_ptr->fsm_msg_cnt = 0;
814 link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
815 l_ptr->fsm_msg_cnt++;
816 link_set_timer(l_ptr, cont_intv / 4);
817 break;
818 case RESET_MSG:
819 dbg_link("RES -> RR\n");
820 link_reset(l_ptr);
821 l_ptr->state = RESET_RESET;
822 l_ptr->fsm_msg_cnt = 0;
823 link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
824 l_ptr->fsm_msg_cnt++;
825 link_set_timer(l_ptr, cont_intv);
826 break;
827 default:
828 err("Unknown link event %u in WW state\n", event);
829 }
830 break;
831 case WORKING_UNKNOWN:
832 dbg_link("WU/");
833 switch (event) {
834 case TRAFFIC_MSG_EVT:
835 dbg_link("TRF-");
836 case ACTIVATE_MSG:
837 dbg_link("ACT -> WW\n");
838 l_ptr->state = WORKING_WORKING;
839 l_ptr->fsm_msg_cnt = 0;
840 link_set_timer(l_ptr, cont_intv);
841 break;
842 case RESET_MSG:
843 dbg_link("RES -> RR\n");
844 link_reset(l_ptr);
845 l_ptr->state = RESET_RESET;
846 l_ptr->fsm_msg_cnt = 0;
847 link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
848 l_ptr->fsm_msg_cnt++;
849 link_set_timer(l_ptr, cont_intv);
850 break;
851 case TIMEOUT_EVT:
852 dbg_link("TIM ");
853 if (l_ptr->next_in_no != l_ptr->checkpoint) {
854 dbg_link("-> WW \n");
855 l_ptr->state = WORKING_WORKING;
856 l_ptr->fsm_msg_cnt = 0;
857 l_ptr->checkpoint = l_ptr->next_in_no;
858 if (bclink_acks_missing(l_ptr->owner)) {
859 link_send_proto_msg(l_ptr, STATE_MSG,
860 0, 0, 0, 0, 0);
861 l_ptr->fsm_msg_cnt++;
862 }
863 link_set_timer(l_ptr, cont_intv);
864 } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
865 dbg_link("Probing %u/%u,timer = %u ms)\n",
866 l_ptr->fsm_msg_cnt, l_ptr->abort_limit,
867 cont_intv / 4);
868 link_send_proto_msg(l_ptr, STATE_MSG,
869 1, 0, 0, 0, 0);
870 l_ptr->fsm_msg_cnt++;
871 link_set_timer(l_ptr, cont_intv / 4);
872 } else { /* Link has failed */
873 dbg_link("-> RU (%u probes unanswered)\n",
874 l_ptr->fsm_msg_cnt);
875 link_reset(l_ptr);
876 l_ptr->state = RESET_UNKNOWN;
877 l_ptr->fsm_msg_cnt = 0;
878 link_send_proto_msg(l_ptr, RESET_MSG,
879 0, 0, 0, 0, 0);
880 l_ptr->fsm_msg_cnt++;
881 link_set_timer(l_ptr, cont_intv);
882 }
883 break;
884 default:
885 err("Unknown link event %u in WU state\n", event);
886 }
887 break;
888 case RESET_UNKNOWN:
889 dbg_link("RU/");
890 switch (event) {
891 case TRAFFIC_MSG_EVT:
892 dbg_link("TRF-\n");
893 break;
894 case ACTIVATE_MSG:
895 other = l_ptr->owner->active_links[0];
896 if (other && link_working_unknown(other)) {
897 dbg_link("ACT\n");
898 break;
899 }
900 dbg_link("ACT -> WW\n");
901 l_ptr->state = WORKING_WORKING;
902 l_ptr->fsm_msg_cnt = 0;
903 link_activate(l_ptr);
904 link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
905 l_ptr->fsm_msg_cnt++;
906 link_set_timer(l_ptr, cont_intv);
907 break;
908 case RESET_MSG:
909 dbg_link("RES \n");
910 dbg_link(" -> RR\n");
911 l_ptr->state = RESET_RESET;
912 l_ptr->fsm_msg_cnt = 0;
913 link_send_proto_msg(l_ptr, ACTIVATE_MSG, 1, 0, 0, 0, 0);
914 l_ptr->fsm_msg_cnt++;
915 link_set_timer(l_ptr, cont_intv);
916 break;
917 case STARTING_EVT:
918 dbg_link("START-");
919 l_ptr->started = 1;
920 /* fall through */
921 case TIMEOUT_EVT:
922 dbg_link("TIM \n");
923 link_send_proto_msg(l_ptr, RESET_MSG, 0, 0, 0, 0, 0);
924 l_ptr->fsm_msg_cnt++;
925 link_set_timer(l_ptr, cont_intv);
926 break;
927 default:
928 err("Unknown link event %u in RU state\n", event);
929 }
930 break;
931 case RESET_RESET:
932 dbg_link("RR/ ");
933 switch (event) {
934 case TRAFFIC_MSG_EVT:
935 dbg_link("TRF-");
936 /* fall through */
937 case ACTIVATE_MSG:
938 other = l_ptr->owner->active_links[0];
939 if (other && link_working_unknown(other)) {
940 dbg_link("ACT\n");
941 break;
942 }
943 dbg_link("ACT -> WW\n");
944 l_ptr->state = WORKING_WORKING;
945 l_ptr->fsm_msg_cnt = 0;
946 link_activate(l_ptr);
947 link_send_proto_msg(l_ptr, STATE_MSG, 1, 0, 0, 0, 0);
948 l_ptr->fsm_msg_cnt++;
949 link_set_timer(l_ptr, cont_intv);
950 break;
951 case RESET_MSG:
952 dbg_link("RES\n");
953 break;
954 case TIMEOUT_EVT:
955 dbg_link("TIM\n");
956 link_send_proto_msg(l_ptr, ACTIVATE_MSG, 0, 0, 0, 0, 0);
957 l_ptr->fsm_msg_cnt++;
958 link_set_timer(l_ptr, cont_intv);
959 dbg_link("fsm_msg_cnt %u\n", l_ptr->fsm_msg_cnt);
960 break;
961 default:
962 err("Unknown link event %u in RR state\n", event);
963 }
964 break;
965 default:
966 err("Unknown link state %u/%u\n", l_ptr->state, event);
967 }
968}
969
970/*
971 * link_bundle_buf(): Append contents of a buffer to
972 * the tail of an existing one.
973 */
974
975static int link_bundle_buf(struct link *l_ptr,
976 struct sk_buff *bundler,
977 struct sk_buff *buf)
978{
979 struct tipc_msg *bundler_msg = buf_msg(bundler);
980 struct tipc_msg *msg = buf_msg(buf);
981 u32 size = msg_size(msg);
982 u32 to_pos = align(msg_size(bundler_msg));
983 u32 rest = link_max_pkt(l_ptr) - to_pos;
984
985 if (msg_user(bundler_msg) != MSG_BUNDLER)
986 return 0;
987 if (msg_type(bundler_msg) != OPEN_MSG)
988 return 0;
989 if (rest < align(size))
990 return 0;
991
992 skb_put(bundler, (to_pos - msg_size(bundler_msg)) + size);
993 memcpy(bundler->data + to_pos, buf->data, size);
994 msg_set_size(bundler_msg, to_pos + size);
995 msg_set_msgcnt(bundler_msg, msg_msgcnt(bundler_msg) + 1);
996 dbg("Packed msg # %u(%u octets) into pos %u in buf(#%u)\n",
997 msg_msgcnt(bundler_msg), size, to_pos, msg_seqno(bundler_msg));
998 msg_dbg(msg, "PACKD:");
999 buf_discard(buf);
1000 l_ptr->stats.sent_bundled++;
1001 return 1;
1002}
1003
1004static inline void link_add_to_outqueue(struct link *l_ptr,
1005 struct sk_buff *buf,
1006 struct tipc_msg *msg)
1007{
1008 u32 ack = mod(l_ptr->next_in_no - 1);
1009 u32 seqno = mod(l_ptr->next_out_no++);
1010
1011 msg_set_word(msg, 2, ((ack << 16) | seqno));
1012 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1013 buf->next = NULL;
1014 if (l_ptr->first_out) {
1015 l_ptr->last_out->next = buf;
1016 l_ptr->last_out = buf;
1017 } else
1018 l_ptr->first_out = l_ptr->last_out = buf;
1019 l_ptr->out_queue_size++;
1020}
1021
1022/*
1023 * link_send_buf() is the 'full path' for messages, called from
1024 * inside TIPC when the 'fast path' in tipc_send_buf
1025 * has failed, and from link_send()
1026 */
1027
1028int link_send_buf(struct link *l_ptr, struct sk_buff *buf)
1029{
1030 struct tipc_msg *msg = buf_msg(buf);
1031 u32 size = msg_size(msg);
1032 u32 dsz = msg_data_sz(msg);
1033 u32 queue_size = l_ptr->out_queue_size;
1034 u32 imp = msg_tot_importance(msg);
1035 u32 queue_limit = l_ptr->queue_limit[imp];
1036 u32 max_packet = link_max_pkt(l_ptr);
1037
1038 msg_set_prevnode(msg, tipc_own_addr); /* If routed message */
1039
1040 /* Match msg importance against queue limits: */
1041
1042 if (unlikely(queue_size >= queue_limit)) {
1043 if (imp <= TIPC_CRITICAL_IMPORTANCE) {
1044 return link_schedule_port(l_ptr, msg_origport(msg),
1045 size);
1046 }
1047 msg_dbg(msg, "TIPC: Congestion, throwing away\n");
1048 buf_discard(buf);
1049 if (imp > CONN_MANAGER) {
1050 warn("Resetting <%s>, send queue full", l_ptr->name);
1051 link_reset(l_ptr);
1052 }
1053 return dsz;
1054 }
1055
1056 /* Fragmentation needed ? */
1057
1058 if (size > max_packet)
1059 return link_send_long_buf(l_ptr, buf);
1060
1061 /* Packet can be queued or sent: */
1062
1063 if (queue_size > l_ptr->stats.max_queue_sz)
1064 l_ptr->stats.max_queue_sz = queue_size;
1065
1066 if (likely(!bearer_congested(l_ptr->b_ptr, l_ptr) &&
1067 !link_congested(l_ptr))) {
1068 link_add_to_outqueue(l_ptr, buf, msg);
1069
1070 if (likely(bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr))) {
1071 l_ptr->unacked_window = 0;
1072 } else {
1073 bearer_schedule(l_ptr->b_ptr, l_ptr);
1074 l_ptr->stats.bearer_congs++;
1075 l_ptr->next_out = buf;
1076 }
1077 return dsz;
1078 }
1079 /* Congestion: can message be bundled ?: */
1080
1081 if ((msg_user(msg) != CHANGEOVER_PROTOCOL) &&
1082 (msg_user(msg) != MSG_FRAGMENTER)) {
1083
1084 /* Try adding message to an existing bundle */
1085
1086 if (l_ptr->next_out &&
1087 link_bundle_buf(l_ptr, l_ptr->last_out, buf)) {
1088 bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1089 return dsz;
1090 }
1091
1092 /* Try creating a new bundle */
1093
1094 if (size <= max_packet * 2 / 3) {
1095 struct sk_buff *bundler = buf_acquire(max_packet);
1096 struct tipc_msg bundler_hdr;
1097
1098 if (bundler) {
1099 msg_init(&bundler_hdr, MSG_BUNDLER, OPEN_MSG,
1100 TIPC_OK, INT_H_SIZE, l_ptr->addr);
1101 memcpy(bundler->data, (unchar *)&bundler_hdr,
1102 INT_H_SIZE);
1103 skb_trim(bundler, INT_H_SIZE);
1104 link_bundle_buf(l_ptr, bundler, buf);
1105 buf = bundler;
1106 msg = buf_msg(buf);
1107 l_ptr->stats.sent_bundles++;
1108 }
1109 }
1110 }
1111 if (!l_ptr->next_out)
1112 l_ptr->next_out = buf;
1113 link_add_to_outqueue(l_ptr, buf, msg);
1114 bearer_resolve_congestion(l_ptr->b_ptr, l_ptr);
1115 return dsz;
1116}
1117
1118/*
1119 * link_send(): same as link_send_buf(), but the link to use has
1120 * not been selected yet, and the the owner node is not locked
1121 * Called by TIPC internal users, e.g. the name distributor
1122 */
1123
1124int link_send(struct sk_buff *buf, u32 dest, u32 selector)
1125{
1126 struct link *l_ptr;
1127 struct node *n_ptr;
1128 int res = -ELINKCONG;
1129
1130 read_lock_bh(&net_lock);
1131 n_ptr = node_select(dest, selector);
1132 if (n_ptr) {
1133 node_lock(n_ptr);
1134 l_ptr = n_ptr->active_links[selector & 1];
1135 dbg("link_send: found link %x for dest %x\n", l_ptr, dest);
1136 if (l_ptr) {
1137 res = link_send_buf(l_ptr, buf);
1138 }
1139 node_unlock(n_ptr);
1140 } else {
1141 dbg("Attempt to send msg to unknown node:\n");
1142 msg_dbg(buf_msg(buf),">>>");
1143 buf_discard(buf);
1144 }
1145 read_unlock_bh(&net_lock);
1146 return res;
1147}
1148
1149/*
1150 * link_send_buf_fast: Entry for data messages where the
1151 * destination link is known and the header is complete,
1152 * inclusive total message length. Very time critical.
1153 * Link is locked. Returns user data length.
1154 */
1155
1156static inline int link_send_buf_fast(struct link *l_ptr, struct sk_buff *buf,
1157 u32 *used_max_pkt)
1158{
1159 struct tipc_msg *msg = buf_msg(buf);
1160 int res = msg_data_sz(msg);
1161
1162 if (likely(!link_congested(l_ptr))) {
1163 if (likely(msg_size(msg) <= link_max_pkt(l_ptr))) {
1164 if (likely(list_empty(&l_ptr->b_ptr->cong_links))) {
1165 link_add_to_outqueue(l_ptr, buf, msg);
1166 if (likely(bearer_send(l_ptr->b_ptr, buf,
1167 &l_ptr->media_addr))) {
1168 l_ptr->unacked_window = 0;
1169 msg_dbg(msg,"SENT_FAST:");
1170 return res;
1171 }
1172 dbg("failed sent fast...\n");
1173 bearer_schedule(l_ptr->b_ptr, l_ptr);
1174 l_ptr->stats.bearer_congs++;
1175 l_ptr->next_out = buf;
1176 return res;
1177 }
1178 }
1179 else
1180 *used_max_pkt = link_max_pkt(l_ptr);
1181 }
1182 return link_send_buf(l_ptr, buf); /* All other cases */
1183}
1184
1185/*
1186 * tipc_send_buf_fast: Entry for data messages where the
1187 * destination node is known and the header is complete,
1188 * inclusive total message length.
1189 * Returns user data length.
1190 */
1191int tipc_send_buf_fast(struct sk_buff *buf, u32 destnode)
1192{
1193 struct link *l_ptr;
1194 struct node *n_ptr;
1195 int res;
1196 u32 selector = msg_origport(buf_msg(buf)) & 1;
1197 u32 dummy;
1198
1199 if (destnode == tipc_own_addr)
1200 return port_recv_msg(buf);
1201
1202 read_lock_bh(&net_lock);
1203 n_ptr = node_select(destnode, selector);
1204 if (likely(n_ptr)) {
1205 node_lock(n_ptr);
1206 l_ptr = n_ptr->active_links[selector];
1207 dbg("send_fast: buf %x selected %x, destnode = %x\n",
1208 buf, l_ptr, destnode);
1209 if (likely(l_ptr)) {
1210 res = link_send_buf_fast(l_ptr, buf, &dummy);
1211 node_unlock(n_ptr);
1212 read_unlock_bh(&net_lock);
1213 return res;
1214 }
1215 node_unlock(n_ptr);
1216 }
1217 read_unlock_bh(&net_lock);
1218 res = msg_data_sz(buf_msg(buf));
1219 tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1220 return res;
1221}
1222
1223
1224/*
1225 * link_send_sections_fast: Entry for messages where the
1226 * destination processor is known and the header is complete,
1227 * except for total message length.
1228 * Returns user data length or errno.
1229 */
1230int link_send_sections_fast(struct port *sender,
1231 struct iovec const *msg_sect,
1232 const u32 num_sect,
1233 u32 destaddr)
1234{
1235 struct tipc_msg *hdr = &sender->publ.phdr;
1236 struct link *l_ptr;
1237 struct sk_buff *buf;
1238 struct node *node;
1239 int res;
1240 u32 selector = msg_origport(hdr) & 1;
1241
1242 assert(destaddr != tipc_own_addr);
1243
1244again:
1245 /*
1246 * Try building message using port's max_pkt hint.
1247 * (Must not hold any locks while building message.)
1248 */
1249
1250 res = msg_build(hdr, msg_sect, num_sect, sender->max_pkt,
1251 !sender->user_port, &buf);
1252
1253 read_lock_bh(&net_lock);
1254 node = node_select(destaddr, selector);
1255 if (likely(node)) {
1256 node_lock(node);
1257 l_ptr = node->active_links[selector];
1258 if (likely(l_ptr)) {
1259 if (likely(buf)) {
1260 res = link_send_buf_fast(l_ptr, buf,
1261 &sender->max_pkt);
1262 if (unlikely(res < 0))
1263 buf_discard(buf);
1264exit:
1265 node_unlock(node);
1266 read_unlock_bh(&net_lock);
1267 return res;
1268 }
1269
1270 /* Exit if build request was invalid */
1271
1272 if (unlikely(res < 0))
1273 goto exit;
1274
1275 /* Exit if link (or bearer) is congested */
1276
1277 if (link_congested(l_ptr) ||
1278 !list_empty(&l_ptr->b_ptr->cong_links)) {
1279 res = link_schedule_port(l_ptr,
1280 sender->publ.ref, res);
1281 goto exit;
1282 }
1283
1284 /*
1285 * Message size exceeds max_pkt hint; update hint,
1286 * then re-try fast path or fragment the message
1287 */
1288
1289 sender->max_pkt = link_max_pkt(l_ptr);
1290 node_unlock(node);
1291 read_unlock_bh(&net_lock);
1292
1293
1294 if ((msg_hdr_sz(hdr) + res) <= sender->max_pkt)
1295 goto again;
1296
1297 return link_send_sections_long(sender, msg_sect,
1298 num_sect, destaddr);
1299 }
1300 node_unlock(node);
1301 }
1302 read_unlock_bh(&net_lock);
1303
1304 /* Couldn't find a link to the destination node */
1305
1306 if (buf)
1307 return tipc_reject_msg(buf, TIPC_ERR_NO_NODE);
1308 if (res >= 0)
1309 return port_reject_sections(sender, hdr, msg_sect, num_sect,
1310 TIPC_ERR_NO_NODE);
1311 return res;
1312}
1313
1314/*
1315 * link_send_sections_long(): Entry for long messages where the
1316 * destination node is known and the header is complete,
1317 * inclusive total message length.
1318 * Link and bearer congestion status have been checked to be ok,
1319 * and are ignored if they change.
1320 *
1321 * Note that fragments do not use the full link MTU so that they won't have
1322 * to undergo refragmentation if link changeover causes them to be sent
1323 * over another link with an additional tunnel header added as prefix.
1324 * (Refragmentation will still occur if the other link has a smaller MTU.)
1325 *
1326 * Returns user data length or errno.
1327 */
1328static int link_send_sections_long(struct port *sender,
1329 struct iovec const *msg_sect,
1330 u32 num_sect,
1331 u32 destaddr)
1332{
1333 struct link *l_ptr;
1334 struct node *node;
1335 struct tipc_msg *hdr = &sender->publ.phdr;
1336 u32 dsz = msg_data_sz(hdr);
1337 u32 max_pkt,fragm_sz,rest;
1338 struct tipc_msg fragm_hdr;
1339 struct sk_buff *buf,*buf_chain,*prev;
1340 u32 fragm_crs,fragm_rest,hsz,sect_rest;
1341 const unchar *sect_crs;
1342 int curr_sect;
1343 u32 fragm_no;
1344
1345again:
1346 fragm_no = 1;
1347 max_pkt = sender->max_pkt - INT_H_SIZE;
1348 /* leave room for tunnel header in case of link changeover */
1349 fragm_sz = max_pkt - INT_H_SIZE;
1350 /* leave room for fragmentation header in each fragment */
1351 rest = dsz;
1352 fragm_crs = 0;
1353 fragm_rest = 0;
1354 sect_rest = 0;
1355 sect_crs = 0;
1356 curr_sect = -1;
1357
1358 /* Prepare reusable fragment header: */
1359
1360 msg_dbg(hdr, ">FRAGMENTING>");
1361 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
1362 TIPC_OK, INT_H_SIZE, msg_destnode(hdr));
1363 msg_set_link_selector(&fragm_hdr, sender->publ.ref);
1364 msg_set_size(&fragm_hdr, max_pkt);
1365 msg_set_fragm_no(&fragm_hdr, 1);
1366
1367 /* Prepare header of first fragment: */
1368
1369 buf_chain = buf = buf_acquire(max_pkt);
1370 if (!buf)
1371 return -ENOMEM;
1372 buf->next = NULL;
1373 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1374 hsz = msg_hdr_sz(hdr);
1375 memcpy(buf->data + INT_H_SIZE, (unchar *)hdr, hsz);
1376 msg_dbg(buf_msg(buf), ">BUILD>");
1377
1378 /* Chop up message: */
1379
1380 fragm_crs = INT_H_SIZE + hsz;
1381 fragm_rest = fragm_sz - hsz;
1382
1383 do { /* For all sections */
1384 u32 sz;
1385
1386 if (!sect_rest) {
1387 sect_rest = msg_sect[++curr_sect].iov_len;
1388 sect_crs = (const unchar *)msg_sect[curr_sect].iov_base;
1389 }
1390
1391 if (sect_rest < fragm_rest)
1392 sz = sect_rest;
1393 else
1394 sz = fragm_rest;
1395
1396 if (likely(!sender->user_port)) {
1397 if (copy_from_user(buf->data + fragm_crs, sect_crs, sz)) {
1398error:
1399 for (; buf_chain; buf_chain = buf) {
1400 buf = buf_chain->next;
1401 buf_discard(buf_chain);
1402 }
1403 return -EFAULT;
1404 }
1405 } else
1406 memcpy(buf->data + fragm_crs, sect_crs, sz);
1407
1408 sect_crs += sz;
1409 sect_rest -= sz;
1410 fragm_crs += sz;
1411 fragm_rest -= sz;
1412 rest -= sz;
1413
1414 if (!fragm_rest && rest) {
1415
1416 /* Initiate new fragment: */
1417 if (rest <= fragm_sz) {
1418 fragm_sz = rest;
1419 msg_set_type(&fragm_hdr,LAST_FRAGMENT);
1420 } else {
1421 msg_set_type(&fragm_hdr, FRAGMENT);
1422 }
1423 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
1424 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
1425 prev = buf;
1426 buf = buf_acquire(fragm_sz + INT_H_SIZE);
1427 if (!buf)
1428 goto error;
1429
1430 buf->next = NULL;
1431 prev->next = buf;
1432 memcpy(buf->data, (unchar *)&fragm_hdr, INT_H_SIZE);
1433 fragm_crs = INT_H_SIZE;
1434 fragm_rest = fragm_sz;
1435 msg_dbg(buf_msg(buf)," >BUILD>");
1436 }
1437 }
1438 while (rest > 0);
1439
1440 /*
1441 * Now we have a buffer chain. Select a link and check
1442 * that packet size is still OK
1443 */
1444 node = node_select(destaddr, sender->publ.ref & 1);
1445 if (likely(node)) {
1446 node_lock(node);
1447 l_ptr = node->active_links[sender->publ.ref & 1];
1448 if (!l_ptr) {
1449 node_unlock(node);
1450 goto reject;
1451 }
1452 if (link_max_pkt(l_ptr) < max_pkt) {
1453 sender->max_pkt = link_max_pkt(l_ptr);
1454 node_unlock(node);
1455 for (; buf_chain; buf_chain = buf) {
1456 buf = buf_chain->next;
1457 buf_discard(buf_chain);
1458 }
1459 goto again;
1460 }
1461 } else {
1462reject:
1463 for (; buf_chain; buf_chain = buf) {
1464 buf = buf_chain->next;
1465 buf_discard(buf_chain);
1466 }
1467 return port_reject_sections(sender, hdr, msg_sect, num_sect,
1468 TIPC_ERR_NO_NODE);
1469 }
1470
1471 /* Append whole chain to send queue: */
1472
1473 buf = buf_chain;
1474 l_ptr->long_msg_seq_no = mod(l_ptr->long_msg_seq_no + 1);
1475 if (!l_ptr->next_out)
1476 l_ptr->next_out = buf_chain;
1477 l_ptr->stats.sent_fragmented++;
1478 while (buf) {
1479 struct sk_buff *next = buf->next;
1480 struct tipc_msg *msg = buf_msg(buf);
1481
1482 l_ptr->stats.sent_fragments++;
1483 msg_set_long_msgno(msg, l_ptr->long_msg_seq_no);
1484 link_add_to_outqueue(l_ptr, buf, msg);
1485 msg_dbg(msg, ">ADD>");
1486 buf = next;
1487 }
1488
1489 /* Send it, if possible: */
1490
1491 link_push_queue(l_ptr);
1492 node_unlock(node);
1493 return dsz;
1494}
1495
1496/*
1497 * link_push_packet: Push one unsent packet to the media
1498 */
1499u32 link_push_packet(struct link *l_ptr)
1500{
1501 struct sk_buff *buf = l_ptr->first_out;
1502 u32 r_q_size = l_ptr->retransm_queue_size;
1503 u32 r_q_head = l_ptr->retransm_queue_head;
1504
1505 /* Step to position where retransmission failed, if any, */
1506 /* consider that buffers may have been released in meantime */
1507
1508 if (r_q_size && buf) {
1509 u32 last = lesser(mod(r_q_head + r_q_size),
1510 link_last_sent(l_ptr));
1511 u32 first = msg_seqno(buf_msg(buf));
1512
1513 while (buf && less(first, r_q_head)) {
1514 first = mod(first + 1);
1515 buf = buf->next;
1516 }
1517 l_ptr->retransm_queue_head = r_q_head = first;
1518 l_ptr->retransm_queue_size = r_q_size = mod(last - first);
1519 }
1520
1521 /* Continue retransmission now, if there is anything: */
1522
1523 if (r_q_size && buf && !skb_cloned(buf)) {
1524 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1525 msg_set_bcast_ack(buf_msg(buf), l_ptr->owner->bclink.last_in);
1526 if (bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1527 msg_dbg(buf_msg(buf), ">DEF-RETR>");
1528 l_ptr->retransm_queue_head = mod(++r_q_head);
1529 l_ptr->retransm_queue_size = --r_q_size;
1530 l_ptr->stats.retransmitted++;
1531 return TIPC_OK;
1532 } else {
1533 l_ptr->stats.bearer_congs++;
1534 msg_dbg(buf_msg(buf), "|>DEF-RETR>");
1535 return PUSH_FAILED;
1536 }
1537 }
1538
1539 /* Send deferred protocol message, if any: */
1540
1541 buf = l_ptr->proto_msg_queue;
1542 if (buf) {
1543 msg_set_ack(buf_msg(buf), mod(l_ptr->next_in_no - 1));
1544 msg_set_bcast_ack(buf_msg(buf),l_ptr->owner->bclink.last_in);
1545 if (bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1546 msg_dbg(buf_msg(buf), ">DEF-PROT>");
1547 l_ptr->unacked_window = 0;
1548 buf_discard(buf);
1549 l_ptr->proto_msg_queue = 0;
1550 return TIPC_OK;
1551 } else {
1552 msg_dbg(buf_msg(buf), "|>DEF-PROT>");
1553 l_ptr->stats.bearer_congs++;
1554 return PUSH_FAILED;
1555 }
1556 }
1557
1558 /* Send one deferred data message, if send window not full: */
1559
1560 buf = l_ptr->next_out;
1561 if (buf) {
1562 struct tipc_msg *msg = buf_msg(buf);
1563 u32 next = msg_seqno(msg);
1564 u32 first = msg_seqno(buf_msg(l_ptr->first_out));
1565
1566 if (mod(next - first) < l_ptr->queue_limit[0]) {
1567 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1568 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1569 if (bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1570 if (msg_user(msg) == MSG_BUNDLER)
1571 msg_set_type(msg, CLOSED_MSG);
1572 msg_dbg(msg, ">PUSH-DATA>");
1573 l_ptr->next_out = buf->next;
1574 return TIPC_OK;
1575 } else {
1576 msg_dbg(msg, "|PUSH-DATA|");
1577 l_ptr->stats.bearer_congs++;
1578 return PUSH_FAILED;
1579 }
1580 }
1581 }
1582 return PUSH_FINISHED;
1583}
1584
1585/*
1586 * push_queue(): push out the unsent messages of a link where
1587 * congestion has abated. Node is locked
1588 */
1589void link_push_queue(struct link *l_ptr)
1590{
1591 u32 res;
1592
1593 if (bearer_congested(l_ptr->b_ptr, l_ptr))
1594 return;
1595
1596 do {
1597 res = link_push_packet(l_ptr);
1598 }
1599 while (res == TIPC_OK);
1600 if (res == PUSH_FAILED)
1601 bearer_schedule(l_ptr->b_ptr, l_ptr);
1602}
1603
1604void link_retransmit(struct link *l_ptr, struct sk_buff *buf,
1605 u32 retransmits)
1606{
1607 struct tipc_msg *msg;
1608
1609 dbg("Retransmitting %u in link %x\n", retransmits, l_ptr);
1610
1611 if (bearer_congested(l_ptr->b_ptr, l_ptr) && buf && !skb_cloned(buf)) {
1612 msg_dbg(buf_msg(buf), ">NO_RETR->BCONG>");
1613 dbg_print_link(l_ptr, " ");
1614 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1615 l_ptr->retransm_queue_size = retransmits;
1616 return;
1617 }
1618 while (retransmits && (buf != l_ptr->next_out) && buf && !skb_cloned(buf)) {
1619 msg = buf_msg(buf);
1620 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1621 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
1622 if (bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
1623 /* Catch if retransmissions fail repeatedly: */
1624 if (l_ptr->last_retransmitted == msg_seqno(msg)) {
1625 if (++l_ptr->stale_count > 100) {
1626 msg_print(CONS, buf_msg(buf), ">RETR>");
1627 info("...Retransmitted %u times\n",
1628 l_ptr->stale_count);
1629 link_print(l_ptr, CONS, "Resetting Link\n");;
1630 link_reset(l_ptr);
1631 break;
1632 }
1633 } else {
1634 l_ptr->stale_count = 0;
1635 }
1636 l_ptr->last_retransmitted = msg_seqno(msg);
1637
1638 msg_dbg(buf_msg(buf), ">RETR>");
1639 buf = buf->next;
1640 retransmits--;
1641 l_ptr->stats.retransmitted++;
1642 } else {
1643 bearer_schedule(l_ptr->b_ptr, l_ptr);
1644 l_ptr->stats.bearer_congs++;
1645 l_ptr->retransm_queue_head = msg_seqno(buf_msg(buf));
1646 l_ptr->retransm_queue_size = retransmits;
1647 return;
1648 }
1649 }
1650 l_ptr->retransm_queue_head = l_ptr->retransm_queue_size = 0;
1651}
1652
1653/*
1654 * link_recv_non_seq: Receive packets which are outside
1655 * the link sequence flow
1656 */
1657
1658static void link_recv_non_seq(struct sk_buff *buf)
1659{
1660 struct tipc_msg *msg = buf_msg(buf);
1661
1662 if (msg_user(msg) == LINK_CONFIG)
1663 disc_recv_msg(buf);
1664 else
1665 bclink_recv_pkt(buf);
1666}
1667
1668/**
1669 * link_insert_deferred_queue - insert deferred messages back into receive chain
1670 */
1671
1672static struct sk_buff *link_insert_deferred_queue(struct link *l_ptr,
1673 struct sk_buff *buf)
1674{
1675 u32 seq_no;
1676
1677 if (l_ptr->oldest_deferred_in == NULL)
1678 return buf;
1679
1680 seq_no = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1681 if (seq_no == mod(l_ptr->next_in_no)) {
1682 l_ptr->newest_deferred_in->next = buf;
1683 buf = l_ptr->oldest_deferred_in;
1684 l_ptr->oldest_deferred_in = NULL;
1685 l_ptr->deferred_inqueue_sz = 0;
1686 }
1687 return buf;
1688}
1689
1690void tipc_recv_msg(struct sk_buff *head, struct tipc_bearer *tb_ptr)
1691{
1692 read_lock_bh(&net_lock);
1693 while (head) {
1694 struct bearer *b_ptr;
1695 struct node *n_ptr;
1696 struct link *l_ptr;
1697 struct sk_buff *crs;
1698 struct sk_buff *buf = head;
1699 struct tipc_msg *msg = buf_msg(buf);
1700 u32 seq_no = msg_seqno(msg);
1701 u32 ackd = msg_ack(msg);
1702 u32 released = 0;
1703 int type;
1704
1705 b_ptr = (struct bearer *)tb_ptr;
1706 TIPC_SKB_CB(buf)->handle = b_ptr;
1707
1708 head = head->next;
1709 if (unlikely(msg_version(msg) != TIPC_VERSION))
1710 goto cont;
1711#if 0
1712 if (msg_user(msg) != LINK_PROTOCOL)
1713#endif
1714 msg_dbg(msg,"<REC<");
1715
1716 if (unlikely(msg_non_seq(msg))) {
1717 link_recv_non_seq(buf);
1718 continue;
1719 }
1720 n_ptr = node_find(msg_prevnode(msg));
1721 if (unlikely(!n_ptr))
1722 goto cont;
1723
1724 node_lock(n_ptr);
1725 l_ptr = n_ptr->links[b_ptr->identity];
1726 if (unlikely(!l_ptr)) {
1727 node_unlock(n_ptr);
1728 goto cont;
1729 }
1730 /*
1731 * Release acked messages
1732 */
1733 if (less(n_ptr->bclink.acked, msg_bcast_ack(msg))) {
1734 if (node_is_up(n_ptr) && n_ptr->bclink.supported)
1735 bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
1736 }
1737
1738 crs = l_ptr->first_out;
1739 while ((crs != l_ptr->next_out) &&
1740 less_eq(msg_seqno(buf_msg(crs)), ackd)) {
1741 struct sk_buff *next = crs->next;
1742
1743 buf_discard(crs);
1744 crs = next;
1745 released++;
1746 }
1747 if (released) {
1748 l_ptr->first_out = crs;
1749 l_ptr->out_queue_size -= released;
1750 }
1751 if (unlikely(l_ptr->next_out))
1752 link_push_queue(l_ptr);
1753 if (unlikely(!list_empty(&l_ptr->waiting_ports)))
1754 link_wakeup_ports(l_ptr, 0);
1755 if (unlikely(++l_ptr->unacked_window >= TIPC_MIN_LINK_WIN)) {
1756 l_ptr->stats.sent_acks++;
1757 link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1758 }
1759
1760protocol_check:
1761 if (likely(link_working_working(l_ptr))) {
1762 if (likely(seq_no == mod(l_ptr->next_in_no))) {
1763 l_ptr->next_in_no++;
1764 if (unlikely(l_ptr->oldest_deferred_in))
1765 head = link_insert_deferred_queue(l_ptr,
1766 head);
1767 if (likely(msg_is_dest(msg, tipc_own_addr))) {
1768deliver:
1769 if (likely(msg_isdata(msg))) {
1770 node_unlock(n_ptr);
1771 port_recv_msg(buf);
1772 continue;
1773 }
1774 switch (msg_user(msg)) {
1775 case MSG_BUNDLER:
1776 l_ptr->stats.recv_bundles++;
1777 l_ptr->stats.recv_bundled +=
1778 msg_msgcnt(msg);
1779 node_unlock(n_ptr);
1780 link_recv_bundle(buf);
1781 continue;
1782 case ROUTE_DISTRIBUTOR:
1783 node_unlock(n_ptr);
1784 cluster_recv_routing_table(buf);
1785 continue;
1786 case NAME_DISTRIBUTOR:
1787 node_unlock(n_ptr);
1788 named_recv(buf);
1789 continue;
1790 case CONN_MANAGER:
1791 node_unlock(n_ptr);
1792 port_recv_proto_msg(buf);
1793 continue;
1794 case MSG_FRAGMENTER:
1795 l_ptr->stats.recv_fragments++;
1796 if (link_recv_fragment(
1797 &l_ptr->defragm_buf,
1798 &buf, &msg)) {
1799 l_ptr->stats.recv_fragmented++;
1800 goto deliver;
1801 }
1802 break;
1803 case CHANGEOVER_PROTOCOL:
1804 type = msg_type(msg);
1805 if (link_recv_changeover_msg(
1806 &l_ptr, &buf)) {
1807 msg = buf_msg(buf);
1808 seq_no = msg_seqno(msg);
1809 TIPC_SKB_CB(buf)->handle
1810 = b_ptr;
1811 if (type == ORIGINAL_MSG)
1812 goto deliver;
1813 goto protocol_check;
1814 }
1815 break;
1816 }
1817 }
1818 node_unlock(n_ptr);
1819 net_route_msg(buf);
1820 continue;
1821 }
1822 link_handle_out_of_seq_msg(l_ptr, buf);
1823 head = link_insert_deferred_queue(l_ptr, head);
1824 node_unlock(n_ptr);
1825 continue;
1826 }
1827
1828 if (msg_user(msg) == LINK_PROTOCOL) {
1829 link_recv_proto_msg(l_ptr, buf);
1830 head = link_insert_deferred_queue(l_ptr, head);
1831 node_unlock(n_ptr);
1832 continue;
1833 }
1834 msg_dbg(msg,"NSEQ<REC<");
1835 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
1836
1837 if (link_working_working(l_ptr)) {
1838 /* Re-insert in front of queue */
1839 msg_dbg(msg,"RECV-REINS:");
1840 buf->next = head;
1841 head = buf;
1842 node_unlock(n_ptr);
1843 continue;
1844 }
1845 node_unlock(n_ptr);
1846cont:
1847 buf_discard(buf);
1848 }
1849 read_unlock_bh(&net_lock);
1850}
1851
1852/*
1853 * link_defer_buf(): Sort a received out-of-sequence packet
1854 * into the deferred reception queue.
1855 * Returns the increase of the queue length,i.e. 0 or 1
1856 */
1857
1858u32 link_defer_pkt(struct sk_buff **head,
1859 struct sk_buff **tail,
1860 struct sk_buff *buf)
1861{
1862 struct sk_buff *prev = 0;
1863 struct sk_buff *crs = *head;
1864 u32 seq_no = msg_seqno(buf_msg(buf));
1865
1866 buf->next = NULL;
1867
1868 /* Empty queue ? */
1869 if (*head == NULL) {
1870 *head = *tail = buf;
1871 return 1;
1872 }
1873
1874 /* Last ? */
1875 if (less(msg_seqno(buf_msg(*tail)), seq_no)) {
1876 (*tail)->next = buf;
1877 *tail = buf;
1878 return 1;
1879 }
1880
1881 /* Scan through queue and sort it in */
1882 do {
1883 struct tipc_msg *msg = buf_msg(crs);
1884
1885 if (less(seq_no, msg_seqno(msg))) {
1886 buf->next = crs;
1887 if (prev)
1888 prev->next = buf;
1889 else
1890 *head = buf;
1891 return 1;
1892 }
1893 if (seq_no == msg_seqno(msg)) {
1894 break;
1895 }
1896 prev = crs;
1897 crs = crs->next;
1898 }
1899 while (crs);
1900
1901 /* Message is a duplicate of an existing message */
1902
1903 buf_discard(buf);
1904 return 0;
1905}
1906
1907/**
1908 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
1909 */
1910
1911static void link_handle_out_of_seq_msg(struct link *l_ptr,
1912 struct sk_buff *buf)
1913{
1914 u32 seq_no = msg_seqno(buf_msg(buf));
1915
1916 if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
1917 link_recv_proto_msg(l_ptr, buf);
1918 return;
1919 }
1920
1921 dbg("rx OOS msg: seq_no %u, expecting %u (%u)\n",
1922 seq_no, mod(l_ptr->next_in_no), l_ptr->next_in_no);
1923
1924 /* Record OOS packet arrival (force mismatch on next timeout) */
1925
1926 l_ptr->checkpoint--;
1927
1928 /*
1929 * Discard packet if a duplicate; otherwise add it to deferred queue
1930 * and notify peer of gap as per protocol specification
1931 */
1932
1933 if (less(seq_no, mod(l_ptr->next_in_no))) {
1934 l_ptr->stats.duplicates++;
1935 buf_discard(buf);
1936 return;
1937 }
1938
1939 if (link_defer_pkt(&l_ptr->oldest_deferred_in,
1940 &l_ptr->newest_deferred_in, buf)) {
1941 l_ptr->deferred_inqueue_sz++;
1942 l_ptr->stats.deferred_recv++;
1943 if ((l_ptr->deferred_inqueue_sz % 16) == 1)
1944 link_send_proto_msg(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);
1945 } else
1946 l_ptr->stats.duplicates++;
1947}
1948
1949/*
1950 * Send protocol message to the other endpoint.
1951 */
1952void link_send_proto_msg(struct link *l_ptr, u32 msg_typ, int probe_msg,
1953 u32 gap, u32 tolerance, u32 priority, u32 ack_mtu)
1954{
1955 struct sk_buff *buf = 0;
1956 struct tipc_msg *msg = l_ptr->pmsg;
1957 u32 msg_size = sizeof(l_ptr->proto_msg);
1958
1959 if (link_blocked(l_ptr))
1960 return;
1961 msg_set_type(msg, msg_typ);
1962 msg_set_net_plane(msg, l_ptr->b_ptr->net_plane);
1963 msg_set_bcast_ack(msg, mod(l_ptr->owner->bclink.last_in));
1964 msg_set_last_bcast(msg, bclink_get_last_sent());
1965
1966 if (msg_typ == STATE_MSG) {
1967 u32 next_sent = mod(l_ptr->next_out_no);
1968
1969 if (!link_is_up(l_ptr))
1970 return;
1971 if (l_ptr->next_out)
1972 next_sent = msg_seqno(buf_msg(l_ptr->next_out));
1973 msg_set_next_sent(msg, next_sent);
1974 if (l_ptr->oldest_deferred_in) {
1975 u32 rec = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
1976 gap = mod(rec - mod(l_ptr->next_in_no));
1977 }
1978 msg_set_seq_gap(msg, gap);
1979 if (gap)
1980 l_ptr->stats.sent_nacks++;
1981 msg_set_link_tolerance(msg, tolerance);
1982 msg_set_linkprio(msg, priority);
1983 msg_set_max_pkt(msg, ack_mtu);
1984 msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
1985 msg_set_probe(msg, probe_msg != 0);
1986 if (probe_msg) {
1987 u32 mtu = l_ptr->max_pkt;
1988
1989 if ((mtu < l_ptr->max_pkt_target) &&
1990 link_working_working(l_ptr) &&
1991 l_ptr->fsm_msg_cnt) {
1992 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1993 if (l_ptr->max_pkt_probes == 10) {
1994 l_ptr->max_pkt_target = (msg_size - 4);
1995 l_ptr->max_pkt_probes = 0;
1996 msg_size = (mtu + (l_ptr->max_pkt_target - mtu)/2 + 2) & ~3;
1997 }
1998 l_ptr->max_pkt_probes++;
1999 }
2000
2001 l_ptr->stats.sent_probes++;
2002 }
2003 l_ptr->stats.sent_states++;
2004 } else { /* RESET_MSG or ACTIVATE_MSG */
2005 msg_set_ack(msg, mod(l_ptr->reset_checkpoint - 1));
2006 msg_set_seq_gap(msg, 0);
2007 msg_set_next_sent(msg, 1);
2008 msg_set_link_tolerance(msg, l_ptr->tolerance);
2009 msg_set_linkprio(msg, l_ptr->priority);
2010 msg_set_max_pkt(msg, l_ptr->max_pkt_target);
2011 }
2012
2013 if (node_has_redundant_links(l_ptr->owner)) {
2014 msg_set_redundant_link(msg);
2015 } else {
2016 msg_clear_redundant_link(msg);
2017 }
2018 msg_set_linkprio(msg, l_ptr->priority);
2019
2020 /* Ensure sequence number will not fit : */
2021
2022 msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
2023
2024 /* Congestion? */
2025
2026 if (bearer_congested(l_ptr->b_ptr, l_ptr)) {
2027 if (!l_ptr->proto_msg_queue) {
2028 l_ptr->proto_msg_queue =
2029 buf_acquire(sizeof(l_ptr->proto_msg));
2030 }
2031 buf = l_ptr->proto_msg_queue;
2032 if (!buf)
2033 return;
2034 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2035 return;
2036 }
2037 msg_set_timestamp(msg, jiffies_to_msecs(jiffies));
2038
2039 /* Message can be sent */
2040
2041 msg_dbg(msg, ">>");
2042
2043 buf = buf_acquire(msg_size);
2044 if (!buf)
2045 return;
2046
2047 memcpy(buf->data, (unchar *)msg, sizeof(l_ptr->proto_msg));
2048 msg_set_size(buf_msg(buf), msg_size);
2049
2050 if (bearer_send(l_ptr->b_ptr, buf, &l_ptr->media_addr)) {
2051 l_ptr->unacked_window = 0;
2052 buf_discard(buf);
2053 return;
2054 }
2055
2056 /* New congestion */
2057 bearer_schedule(l_ptr->b_ptr, l_ptr);
2058 l_ptr->proto_msg_queue = buf;
2059 l_ptr->stats.bearer_congs++;
2060}
2061
2062/*
2063 * Receive protocol message :
2064 * Note that network plane id propagates through the network, and may
2065 * change at any time. The node with lowest address rules
2066 */
2067
2068static void link_recv_proto_msg(struct link *l_ptr, struct sk_buff *buf)
2069{
2070 u32 rec_gap = 0;
2071 u32 max_pkt_info;
2072 u32 max_pkt_ack;
2073 u32 msg_tol;
2074 struct tipc_msg *msg = buf_msg(buf);
2075
2076 dbg("AT(%u):", jiffies_to_msecs(jiffies));
2077 msg_dbg(msg, "<<");
2078 if (link_blocked(l_ptr))
2079 goto exit;
2080
2081 /* record unnumbered packet arrival (force mismatch on next timeout) */
2082
2083 l_ptr->checkpoint--;
2084
2085 if (l_ptr->b_ptr->net_plane != msg_net_plane(msg))
2086 if (tipc_own_addr > msg_prevnode(msg))
2087 l_ptr->b_ptr->net_plane = msg_net_plane(msg);
2088
2089 l_ptr->owner->permit_changeover = msg_redundant_link(msg);
2090
2091 switch (msg_type(msg)) {
2092
2093 case RESET_MSG:
2094 if (!link_working_unknown(l_ptr) && l_ptr->peer_session) {
2095 if (msg_session(msg) == l_ptr->peer_session) {
2096 dbg("Duplicate RESET: %u<->%u\n",
2097 msg_session(msg), l_ptr->peer_session);
2098 break; /* duplicate: ignore */
2099 }
2100 }
2101 /* fall thru' */
2102 case ACTIVATE_MSG:
2103 /* Update link settings according other endpoint's values */
2104
2105 strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
2106
2107 if ((msg_tol = msg_link_tolerance(msg)) &&
2108 (msg_tol > l_ptr->tolerance))
2109 link_set_supervision_props(l_ptr, msg_tol);
2110
2111 if (msg_linkprio(msg) > l_ptr->priority)
2112 l_ptr->priority = msg_linkprio(msg);
2113
2114 max_pkt_info = msg_max_pkt(msg);
2115 if (max_pkt_info) {
2116 if (max_pkt_info < l_ptr->max_pkt_target)
2117 l_ptr->max_pkt_target = max_pkt_info;
2118 if (l_ptr->max_pkt > l_ptr->max_pkt_target)
2119 l_ptr->max_pkt = l_ptr->max_pkt_target;
2120 } else {
2121 l_ptr->max_pkt = l_ptr->max_pkt_target;
2122 }
2123 l_ptr->owner->bclink.supported = (max_pkt_info != 0);
2124
2125 link_state_event(l_ptr, msg_type(msg));
2126
2127 l_ptr->peer_session = msg_session(msg);
2128 l_ptr->peer_bearer_id = msg_bearer_id(msg);
2129
2130 /* Synchronize broadcast sequence numbers */
2131 if (!node_has_redundant_links(l_ptr->owner)) {
2132 l_ptr->owner->bclink.last_in = mod(msg_last_bcast(msg));
2133 }
2134 break;
2135 case STATE_MSG:
2136
2137 if ((msg_tol = msg_link_tolerance(msg)))
2138 link_set_supervision_props(l_ptr, msg_tol);
2139
2140 if (msg_linkprio(msg) &&
2141 (msg_linkprio(msg) != l_ptr->priority)) {
2142 warn("Changing prio <%s>: %u->%u\n",
2143 l_ptr->name, l_ptr->priority, msg_linkprio(msg));
2144 l_ptr->priority = msg_linkprio(msg);
2145 link_reset(l_ptr); /* Enforce change to take effect */
2146 break;
2147 }
2148 link_state_event(l_ptr, TRAFFIC_MSG_EVT);
2149 l_ptr->stats.recv_states++;
2150 if (link_reset_unknown(l_ptr))
2151 break;
2152
2153 if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
2154 rec_gap = mod(msg_next_sent(msg) -
2155 mod(l_ptr->next_in_no));
2156 }
2157
2158 max_pkt_ack = msg_max_pkt(msg);
2159 if (max_pkt_ack > l_ptr->max_pkt) {
2160 dbg("Link <%s> updated MTU %u -> %u\n",
2161 l_ptr->name, l_ptr->max_pkt, max_pkt_ack);
2162 l_ptr->max_pkt = max_pkt_ack;
2163 l_ptr->max_pkt_probes = 0;
2164 }
2165
2166 max_pkt_ack = 0;
2167 if (msg_probe(msg)) {
2168 l_ptr->stats.recv_probes++;
2169 if (msg_size(msg) > sizeof(l_ptr->proto_msg)) {
2170 max_pkt_ack = msg_size(msg);
2171 }
2172 }
2173
2174 /* Protocol message before retransmits, reduce loss risk */
2175
2176 bclink_check_gap(l_ptr->owner, msg_last_bcast(msg));
2177
2178 if (rec_gap || (msg_probe(msg))) {
2179 link_send_proto_msg(l_ptr, STATE_MSG,
2180 0, rec_gap, 0, 0, max_pkt_ack);
2181 }
2182 if (msg_seq_gap(msg)) {
2183 msg_dbg(msg, "With Gap:");
2184 l_ptr->stats.recv_nacks++;
2185 link_retransmit(l_ptr, l_ptr->first_out,
2186 msg_seq_gap(msg));
2187 }
2188 break;
2189 default:
2190 msg_dbg(buf_msg(buf), "<DISCARDING UNKNOWN<");
2191 }
2192exit:
2193 buf_discard(buf);
2194}
2195
2196
2197/*
2198 * link_tunnel(): Send one message via a link belonging to
2199 * another bearer. Owner node is locked.
2200 */
2201void link_tunnel(struct link *l_ptr,
2202 struct tipc_msg *tunnel_hdr,
2203 struct tipc_msg *msg,
2204 u32 selector)
2205{
2206 struct link *tunnel;
2207 struct sk_buff *buf;
2208 u32 length = msg_size(msg);
2209
2210 tunnel = l_ptr->owner->active_links[selector & 1];
2211 if (!link_is_up(tunnel))
2212 return;
2213 msg_set_size(tunnel_hdr, length + INT_H_SIZE);
2214 buf = buf_acquire(length + INT_H_SIZE);
2215 if (!buf)
2216 return;
2217 memcpy(buf->data, (unchar *)tunnel_hdr, INT_H_SIZE);
2218 memcpy(buf->data + INT_H_SIZE, (unchar *)msg, length);
2219 dbg("%c->%c:", l_ptr->b_ptr->net_plane, tunnel->b_ptr->net_plane);
2220 msg_dbg(buf_msg(buf), ">SEND>");
2221 assert(tunnel);
2222 link_send_buf(tunnel, buf);
2223}
2224
2225
2226
2227/*
2228 * changeover(): Send whole message queue via the remaining link
2229 * Owner node is locked.
2230 */
2231
2232void link_changeover(struct link *l_ptr)
2233{
2234 u32 msgcount = l_ptr->out_queue_size;
2235 struct sk_buff *crs = l_ptr->first_out;
2236 struct link *tunnel = l_ptr->owner->active_links[0];
2237 int split_bundles = node_has_redundant_links(l_ptr->owner);
2238 struct tipc_msg tunnel_hdr;
2239
2240 if (!tunnel)
2241 return;
2242
2243 if (!l_ptr->owner->permit_changeover)
2244 return;
2245
2246 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2247 ORIGINAL_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2248 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2249 msg_set_msgcnt(&tunnel_hdr, msgcount);
2250 if (!l_ptr->first_out) {
2251 struct sk_buff *buf;
2252
2253 assert(!msgcount);
2254 buf = buf_acquire(INT_H_SIZE);
2255 if (buf) {
2256 memcpy(buf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2257 msg_set_size(&tunnel_hdr, INT_H_SIZE);
2258 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2259 tunnel->b_ptr->net_plane);
2260 msg_dbg(&tunnel_hdr, "EMPTY>SEND>");
2261 link_send_buf(tunnel, buf);
2262 } else {
2263 warn("Memory squeeze; link changeover failed\n");
2264 }
2265 return;
2266 }
2267 while (crs) {
2268 struct tipc_msg *msg = buf_msg(crs);
2269
2270 if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
2271 u32 msgcount = msg_msgcnt(msg);
2272 struct tipc_msg *m = msg_get_wrapped(msg);
2273 unchar* pos = (unchar*)m;
2274
2275 while (msgcount--) {
2276 msg_set_seqno(m,msg_seqno(msg));
2277 link_tunnel(l_ptr, &tunnel_hdr, m,
2278 msg_link_selector(m));
2279 pos += align(msg_size(m));
2280 m = (struct tipc_msg *)pos;
2281 }
2282 } else {
2283 link_tunnel(l_ptr, &tunnel_hdr, msg,
2284 msg_link_selector(msg));
2285 }
2286 crs = crs->next;
2287 }
2288}
2289
2290void link_send_duplicate(struct link *l_ptr, struct link *tunnel)
2291{
2292 struct sk_buff *iter;
2293 struct tipc_msg tunnel_hdr;
2294
2295 msg_init(&tunnel_hdr, CHANGEOVER_PROTOCOL,
2296 DUPLICATE_MSG, TIPC_OK, INT_H_SIZE, l_ptr->addr);
2297 msg_set_msgcnt(&tunnel_hdr, l_ptr->out_queue_size);
2298 msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
2299 iter = l_ptr->first_out;
2300 while (iter) {
2301 struct sk_buff *outbuf;
2302 struct tipc_msg *msg = buf_msg(iter);
2303 u32 length = msg_size(msg);
2304
2305 if (msg_user(msg) == MSG_BUNDLER)
2306 msg_set_type(msg, CLOSED_MSG);
2307 msg_set_ack(msg, mod(l_ptr->next_in_no - 1)); /* Update */
2308 msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
2309 msg_set_size(&tunnel_hdr, length + INT_H_SIZE);
2310 outbuf = buf_acquire(length + INT_H_SIZE);
2311 if (outbuf == NULL) {
2312 warn("Memory squeeze; buffer duplication failed\n");
2313 return;
2314 }
2315 memcpy(outbuf->data, (unchar *)&tunnel_hdr, INT_H_SIZE);
2316 memcpy(outbuf->data + INT_H_SIZE, iter->data, length);
2317 dbg("%c->%c:", l_ptr->b_ptr->net_plane,
2318 tunnel->b_ptr->net_plane);
2319 msg_dbg(buf_msg(outbuf), ">SEND>");
2320 link_send_buf(tunnel, outbuf);
2321 if (!link_is_up(l_ptr))
2322 return;
2323 iter = iter->next;
2324 }
2325}
2326
2327
2328
2329/**
2330 * buf_extract - extracts embedded TIPC message from another message
2331 * @skb: encapsulating message buffer
2332 * @from_pos: offset to extract from
2333 *
2334 * Returns a new message buffer containing an embedded message. The
2335 * encapsulating message itself is left unchanged.
2336 */
2337
2338static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)
2339{
2340 struct tipc_msg *msg = (struct tipc_msg *)(skb->data + from_pos);
2341 u32 size = msg_size(msg);
2342 struct sk_buff *eb;
2343
2344 eb = buf_acquire(size);
2345 if (eb)
2346 memcpy(eb->data, (unchar *)msg, size);
2347 return eb;
2348}
2349
2350/*
2351 * link_recv_changeover_msg(): Receive tunneled packet sent
2352 * via other link. Node is locked. Return extracted buffer.
2353 */
2354
2355static int link_recv_changeover_msg(struct link **l_ptr,
2356 struct sk_buff **buf)
2357{
2358 struct sk_buff *tunnel_buf = *buf;
2359 struct link *dest_link;
2360 struct tipc_msg *msg;
2361 struct tipc_msg *tunnel_msg = buf_msg(tunnel_buf);
2362 u32 msg_typ = msg_type(tunnel_msg);
2363 u32 msg_count = msg_msgcnt(tunnel_msg);
2364
2365 dest_link = (*l_ptr)->owner->links[msg_bearer_id(tunnel_msg)];
2366 assert(dest_link != *l_ptr);
2367 if (!dest_link) {
2368 msg_dbg(tunnel_msg, "NOLINK/<REC<");
2369 goto exit;
2370 }
2371 dbg("%c<-%c:", dest_link->b_ptr->net_plane,
2372 (*l_ptr)->b_ptr->net_plane);
2373 *l_ptr = dest_link;
2374 msg = msg_get_wrapped(tunnel_msg);
2375
2376 if (msg_typ == DUPLICATE_MSG) {
2377 if (less(msg_seqno(msg), mod(dest_link->next_in_no))) {
2378 msg_dbg(tunnel_msg, "DROP/<REC<");
2379 goto exit;
2380 }
2381 *buf = buf_extract(tunnel_buf,INT_H_SIZE);
2382 if (*buf == NULL) {
2383 warn("Memory squeeze; failed to extract msg\n");
2384 goto exit;
2385 }
2386 msg_dbg(tunnel_msg, "TNL<REC<");
2387 buf_discard(tunnel_buf);
2388 return 1;
2389 }
2390
2391 /* First original message ?: */
2392
2393 if (link_is_up(dest_link)) {
2394 msg_dbg(tunnel_msg, "UP/FIRST/<REC<");
2395 link_reset(dest_link);
2396 dest_link->exp_msg_count = msg_count;
2397 if (!msg_count)
2398 goto exit;
2399 } else if (dest_link->exp_msg_count == START_CHANGEOVER) {
2400 msg_dbg(tunnel_msg, "BLK/FIRST/<REC<");
2401 dest_link->exp_msg_count = msg_count;
2402 if (!msg_count)
2403 goto exit;
2404 }
2405
2406 /* Receive original message */
2407
2408 if (dest_link->exp_msg_count == 0) {
2409 msg_dbg(tunnel_msg, "OVERDUE/DROP/<REC<");
2410 dbg_print_link(dest_link, "LINK:");
2411 goto exit;
2412 }
2413 dest_link->exp_msg_count--;
2414 if (less(msg_seqno(msg), dest_link->reset_checkpoint)) {
2415 msg_dbg(tunnel_msg, "DROP/DUPL/<REC<");
2416 goto exit;
2417 } else {
2418 *buf = buf_extract(tunnel_buf, INT_H_SIZE);
2419 if (*buf != NULL) {
2420 msg_dbg(tunnel_msg, "TNL<REC<");
2421 buf_discard(tunnel_buf);
2422 return 1;
2423 } else {
2424 warn("Memory squeeze; dropped incoming msg\n");
2425 }
2426 }
2427exit:
2428 *buf = 0;
2429 buf_discard(tunnel_buf);
2430 return 0;
2431}
2432
2433/*
2434 * Bundler functionality:
2435 */
2436void link_recv_bundle(struct sk_buff *buf)
2437{
2438 u32 msgcount = msg_msgcnt(buf_msg(buf));
2439 u32 pos = INT_H_SIZE;
2440 struct sk_buff *obuf;
2441
2442 msg_dbg(buf_msg(buf), "<BNDL<: ");
2443 while (msgcount--) {
2444 obuf = buf_extract(buf, pos);
2445 if (obuf == NULL) {
2446 char addr_string[16];
2447
2448 warn("Buffer allocation failure;\n");
2449 warn(" incoming message(s) from %s lost\n",
2450 addr_string_fill(addr_string,
2451 msg_orignode(buf_msg(buf))));
2452 return;
2453 };
2454 pos += align(msg_size(buf_msg(obuf)));
2455 msg_dbg(buf_msg(obuf), " /");
2456 net_route_msg(obuf);
2457 }
2458 buf_discard(buf);
2459}
2460
2461/*
2462 * Fragmentation/defragmentation:
2463 */
2464
2465
2466/*
2467 * link_send_long_buf: Entry for buffers needing fragmentation.
2468 * The buffer is complete, inclusive total message length.
2469 * Returns user data length.
2470 */
2471int link_send_long_buf(struct link *l_ptr, struct sk_buff *buf)
2472{
2473 struct tipc_msg *inmsg = buf_msg(buf);
2474 struct tipc_msg fragm_hdr;
2475 u32 insize = msg_size(inmsg);
2476 u32 dsz = msg_data_sz(inmsg);
2477 unchar *crs = buf->data;
2478 u32 rest = insize;
2479 u32 pack_sz = link_max_pkt(l_ptr);
2480 u32 fragm_sz = pack_sz - INT_H_SIZE;
2481 u32 fragm_no = 1;
2482 u32 destaddr = msg_destnode(inmsg);
2483
2484 if (msg_short(inmsg))
2485 destaddr = l_ptr->addr;
2486
2487 if (msg_routed(inmsg))
2488 msg_set_prevnode(inmsg, tipc_own_addr);
2489
2490 /* Prepare reusable fragment header: */
2491
2492 msg_init(&fragm_hdr, MSG_FRAGMENTER, FIRST_FRAGMENT,
2493 TIPC_OK, INT_H_SIZE, destaddr);
2494 msg_set_link_selector(&fragm_hdr, msg_link_selector(inmsg));
2495 msg_set_long_msgno(&fragm_hdr, mod(l_ptr->long_msg_seq_no++));
2496 msg_set_fragm_no(&fragm_hdr, fragm_no);
2497 l_ptr->stats.sent_fragmented++;
2498
2499 /* Chop up message: */
2500
2501 while (rest > 0) {
2502 struct sk_buff *fragm;
2503
2504 if (rest <= fragm_sz) {
2505 fragm_sz = rest;
2506 msg_set_type(&fragm_hdr, LAST_FRAGMENT);
2507 }
2508 fragm = buf_acquire(fragm_sz + INT_H_SIZE);
2509 if (fragm == NULL) {
2510 warn("Memory squeeze; failed to fragment msg\n");
2511 dsz = -ENOMEM;
2512 goto exit;
2513 }
2514 msg_set_size(&fragm_hdr, fragm_sz + INT_H_SIZE);
2515 memcpy(fragm->data, (unchar *)&fragm_hdr, INT_H_SIZE);
2516 memcpy(fragm->data + INT_H_SIZE, crs, fragm_sz);
2517
2518 /* Send queued messages first, if any: */
2519
2520 l_ptr->stats.sent_fragments++;
2521 link_send_buf(l_ptr, fragm);
2522 if (!link_is_up(l_ptr))
2523 return dsz;
2524 msg_set_fragm_no(&fragm_hdr, ++fragm_no);
2525 rest -= fragm_sz;
2526 crs += fragm_sz;
2527 msg_set_type(&fragm_hdr, FRAGMENT);
2528 }
2529exit:
2530 buf_discard(buf);
2531 return dsz;
2532}
2533
2534/*
2535 * A pending message being re-assembled must store certain values
2536 * to handle subsequent fragments correctly. The following functions
2537 * help storing these values in unused, available fields in the
2538 * pending message. This makes dynamic memory allocation unecessary.
2539 */
2540
2541static inline u32 get_long_msg_seqno(struct sk_buff *buf)
2542{
2543 return msg_seqno(buf_msg(buf));
2544}
2545
2546static inline void set_long_msg_seqno(struct sk_buff *buf, u32 seqno)
2547{
2548 msg_set_seqno(buf_msg(buf), seqno);
2549}
2550
2551static inline u32 get_fragm_size(struct sk_buff *buf)
2552{
2553 return msg_ack(buf_msg(buf));
2554}
2555
2556static inline void set_fragm_size(struct sk_buff *buf, u32 sz)
2557{
2558 msg_set_ack(buf_msg(buf), sz);
2559}
2560
2561static inline u32 get_expected_frags(struct sk_buff *buf)
2562{
2563 return msg_bcast_ack(buf_msg(buf));
2564}
2565
2566static inline void set_expected_frags(struct sk_buff *buf, u32 exp)
2567{
2568 msg_set_bcast_ack(buf_msg(buf), exp);
2569}
2570
2571static inline u32 get_timer_cnt(struct sk_buff *buf)
2572{
2573 return msg_reroute_cnt(buf_msg(buf));
2574}
2575
2576static inline void incr_timer_cnt(struct sk_buff *buf)
2577{
2578 msg_incr_reroute_cnt(buf_msg(buf));
2579}
2580
2581/*
2582 * link_recv_fragment(): Called with node lock on. Returns
2583 * the reassembled buffer if message is complete.
2584 */
2585int link_recv_fragment(struct sk_buff **pending, struct sk_buff **fb,
2586 struct tipc_msg **m)
2587{
2588 struct sk_buff *prev = 0;
2589 struct sk_buff *fbuf = *fb;
2590 struct tipc_msg *fragm = buf_msg(fbuf);
2591 struct sk_buff *pbuf = *pending;
2592 u32 long_msg_seq_no = msg_long_msgno(fragm);
2593
2594 *fb = 0;
2595 msg_dbg(fragm,"FRG<REC<");
2596
2597 /* Is there an incomplete message waiting for this fragment? */
2598
2599 while (pbuf && ((msg_seqno(buf_msg(pbuf)) != long_msg_seq_no)
2600 || (msg_orignode(fragm) != msg_orignode(buf_msg(pbuf))))) {
2601 prev = pbuf;
2602 pbuf = pbuf->next;
2603 }
2604
2605 if (!pbuf && (msg_type(fragm) == FIRST_FRAGMENT)) {
2606 struct tipc_msg *imsg = (struct tipc_msg *)msg_data(fragm);
2607 u32 msg_sz = msg_size(imsg);
2608 u32 fragm_sz = msg_data_sz(fragm);
2609 u32 exp_fragm_cnt = msg_sz/fragm_sz + !!(msg_sz % fragm_sz);
2610 u32 max = TIPC_MAX_USER_MSG_SIZE + LONG_H_SIZE;
2611 if (msg_type(imsg) == TIPC_MCAST_MSG)
2612 max = TIPC_MAX_USER_MSG_SIZE + MCAST_H_SIZE;
2613 if (msg_size(imsg) > max) {
2614 msg_dbg(fragm,"<REC<Oversized: ");
2615 buf_discard(fbuf);
2616 return 0;
2617 }
2618 pbuf = buf_acquire(msg_size(imsg));
2619 if (pbuf != NULL) {
2620 pbuf->next = *pending;
2621 *pending = pbuf;
2622 memcpy(pbuf->data, (unchar *)imsg, msg_data_sz(fragm));
2623
2624 /* Prepare buffer for subsequent fragments. */
2625
2626 set_long_msg_seqno(pbuf, long_msg_seq_no);
2627 set_fragm_size(pbuf,fragm_sz);
2628 set_expected_frags(pbuf,exp_fragm_cnt - 1);
2629 } else {
2630 warn("Memory squeeze; got no defragmenting buffer\n");
2631 }
2632 buf_discard(fbuf);
2633 return 0;
2634 } else if (pbuf && (msg_type(fragm) != FIRST_FRAGMENT)) {
2635 u32 dsz = msg_data_sz(fragm);
2636 u32 fsz = get_fragm_size(pbuf);
2637 u32 crs = ((msg_fragm_no(fragm) - 1) * fsz);
2638 u32 exp_frags = get_expected_frags(pbuf) - 1;
2639 memcpy(pbuf->data + crs, msg_data(fragm), dsz);
2640 buf_discard(fbuf);
2641
2642 /* Is message complete? */
2643
2644 if (exp_frags == 0) {
2645 if (prev)
2646 prev->next = pbuf->next;
2647 else
2648 *pending = pbuf->next;
2649 msg_reset_reroute_cnt(buf_msg(pbuf));
2650 *fb = pbuf;
2651 *m = buf_msg(pbuf);
2652 return 1;
2653 }
2654 set_expected_frags(pbuf,exp_frags);
2655 return 0;
2656 }
2657 dbg(" Discarding orphan fragment %x\n",fbuf);
2658 msg_dbg(fragm,"ORPHAN:");
2659 dbg("Pending long buffers:\n");
2660 dbg_print_buf_chain(*pending);
2661 buf_discard(fbuf);
2662 return 0;
2663}
2664
2665/**
2666 * link_check_defragm_bufs - flush stale incoming message fragments
2667 * @l_ptr: pointer to link
2668 */
2669
2670static void link_check_defragm_bufs(struct link *l_ptr)
2671{
2672 struct sk_buff *prev = 0;
2673 struct sk_buff *next = 0;
2674 struct sk_buff *buf = l_ptr->defragm_buf;
2675
2676 if (!buf)
2677 return;
2678 if (!link_working_working(l_ptr))
2679 return;
2680 while (buf) {
2681 u32 cnt = get_timer_cnt(buf);
2682
2683 next = buf->next;
2684 if (cnt < 4) {
2685 incr_timer_cnt(buf);
2686 prev = buf;
2687 } else {
2688 dbg(" Discarding incomplete long buffer\n");
2689 msg_dbg(buf_msg(buf), "LONG:");
2690 dbg_print_link(l_ptr, "curr:");
2691 dbg("Pending long buffers:\n");
2692 dbg_print_buf_chain(l_ptr->defragm_buf);
2693 if (prev)
2694 prev->next = buf->next;
2695 else
2696 l_ptr->defragm_buf = buf->next;
2697 buf_discard(buf);
2698 }
2699 buf = next;
2700 }
2701}
2702
2703
2704
2705static void link_set_supervision_props(struct link *l_ptr, u32 tolerance)
2706{
2707 l_ptr->tolerance = tolerance;
2708 l_ptr->continuity_interval =
2709 ((tolerance / 4) > 500) ? 500 : tolerance / 4;
2710 l_ptr->abort_limit = tolerance / (l_ptr->continuity_interval / 4);
2711}
2712
2713
2714void link_set_queue_limits(struct link *l_ptr, u32 window)
2715{
2716 /* Data messages from this node, inclusive FIRST_FRAGM */
2717 l_ptr->queue_limit[DATA_LOW] = window;
2718 l_ptr->queue_limit[DATA_MEDIUM] = (window / 3) * 4;
2719 l_ptr->queue_limit[DATA_HIGH] = (window / 3) * 5;
2720 l_ptr->queue_limit[DATA_CRITICAL] = (window / 3) * 6;
2721 /* Transiting data messages,inclusive FIRST_FRAGM */
2722 l_ptr->queue_limit[DATA_LOW + 4] = 300;
2723 l_ptr->queue_limit[DATA_MEDIUM + 4] = 600;
2724 l_ptr->queue_limit[DATA_HIGH + 4] = 900;
2725 l_ptr->queue_limit[DATA_CRITICAL + 4] = 1200;
2726 l_ptr->queue_limit[CONN_MANAGER] = 1200;
2727 l_ptr->queue_limit[ROUTE_DISTRIBUTOR] = 1200;
2728 l_ptr->queue_limit[CHANGEOVER_PROTOCOL] = 2500;
2729 l_ptr->queue_limit[NAME_DISTRIBUTOR] = 3000;
2730 /* FRAGMENT and LAST_FRAGMENT packets */
2731 l_ptr->queue_limit[MSG_FRAGMENTER] = 4000;
2732}
2733
2734/**
2735 * link_find_link - locate link by name
2736 * @name - ptr to link name string
2737 * @node - ptr to area to be filled with ptr to associated node
2738 *
2739 * Caller must hold 'net_lock' to ensure node and bearer are not deleted;
2740 * this also prevents link deletion.
2741 *
2742 * Returns pointer to link (or 0 if invalid link name).
2743 */
2744
2745static struct link *link_find_link(const char *name, struct node **node)
2746{
2747 struct link_name link_name_parts;
2748 struct bearer *b_ptr;
2749 struct link *l_ptr;
2750
2751 if (!link_name_validate(name, &link_name_parts))
2752 return 0;
2753
2754 b_ptr = bearer_find_interface(link_name_parts.if_local);
2755 if (!b_ptr)
2756 return 0;
2757
2758 *node = node_find(link_name_parts.addr_peer);
2759 if (!*node)
2760 return 0;
2761
2762 l_ptr = (*node)->links[b_ptr->identity];
2763 if (!l_ptr || strcmp(l_ptr->name, name))
2764 return 0;
2765
2766 return l_ptr;
2767}
2768
2769struct sk_buff *link_cmd_config(const void *req_tlv_area, int req_tlv_space,
2770 u16 cmd)
2771{
2772 struct tipc_link_config *args;
2773 u32 new_value;
2774 struct link *l_ptr;
2775 struct node *node;
2776 int res;
2777
2778 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_CONFIG))
2779 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2780
2781 args = (struct tipc_link_config *)TLV_DATA(req_tlv_area);
2782 new_value = ntohl(args->value);
2783
2784 if (!strcmp(args->name, bc_link_name)) {
2785 if ((cmd == TIPC_CMD_SET_LINK_WINDOW) &&
2786 (bclink_set_queue_limits(new_value) == 0))
2787 return cfg_reply_none();
2788 return cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
2789 " (cannot change setting on broadcast link)");
2790 }
2791
2792 read_lock_bh(&net_lock);
2793 l_ptr = link_find_link(args->name, &node);
2794 if (!l_ptr) {
2795 read_unlock_bh(&net_lock);
2796 return cfg_reply_error_string("link not found");
2797 }
2798
2799 node_lock(node);
2800 res = -EINVAL;
2801 switch (cmd) {
2802 case TIPC_CMD_SET_LINK_TOL:
2803 if ((new_value >= TIPC_MIN_LINK_TOL) &&
2804 (new_value <= TIPC_MAX_LINK_TOL)) {
2805 link_set_supervision_props(l_ptr, new_value);
2806 link_send_proto_msg(l_ptr, STATE_MSG,
2807 0, 0, new_value, 0, 0);
2808 res = TIPC_OK;
2809 }
2810 break;
2811 case TIPC_CMD_SET_LINK_PRI:
2812 if (new_value < TIPC_NUM_LINK_PRI) {
2813 l_ptr->priority = new_value;
2814 link_send_proto_msg(l_ptr, STATE_MSG,
2815 0, 0, 0, new_value, 0);
2816 res = TIPC_OK;
2817 }
2818 break;
2819 case TIPC_CMD_SET_LINK_WINDOW:
2820 if ((new_value >= TIPC_MIN_LINK_WIN) &&
2821 (new_value <= TIPC_MAX_LINK_WIN)) {
2822 link_set_queue_limits(l_ptr, new_value);
2823 res = TIPC_OK;
2824 }
2825 break;
2826 }
2827 node_unlock(node);
2828
2829 read_unlock_bh(&net_lock);
2830 if (res)
2831 return cfg_reply_error_string("cannot change link setting");
2832
2833 return cfg_reply_none();
2834}
2835
2836/**
2837 * link_reset_statistics - reset link statistics
2838 * @l_ptr: pointer to link
2839 */
2840
2841static void link_reset_statistics(struct link *l_ptr)
2842{
2843 memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
2844 l_ptr->stats.sent_info = l_ptr->next_out_no;
2845 l_ptr->stats.recv_info = l_ptr->next_in_no;
2846}
2847
2848struct sk_buff *link_cmd_reset_stats(const void *req_tlv_area, int req_tlv_space)
2849{
2850 char *link_name;
2851 struct link *l_ptr;
2852 struct node *node;
2853
2854 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2855 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2856
2857 link_name = (char *)TLV_DATA(req_tlv_area);
2858 if (!strcmp(link_name, bc_link_name)) {
2859 if (bclink_reset_stats())
2860 return cfg_reply_error_string("link not found");
2861 return cfg_reply_none();
2862 }
2863
2864 read_lock_bh(&net_lock);
2865 l_ptr = link_find_link(link_name, &node);
2866 if (!l_ptr) {
2867 read_unlock_bh(&net_lock);
2868 return cfg_reply_error_string("link not found");
2869 }
2870
2871 node_lock(node);
2872 link_reset_statistics(l_ptr);
2873 node_unlock(node);
2874 read_unlock_bh(&net_lock);
2875 return cfg_reply_none();
2876}
2877
2878/**
2879 * percent - convert count to a percentage of total (rounding up or down)
2880 */
2881
2882static u32 percent(u32 count, u32 total)
2883{
2884 return (count * 100 + (total / 2)) / total;
2885}
2886
2887/**
2888 * link_stats - print link statistics
2889 * @name: link name
2890 * @buf: print buffer area
2891 * @buf_size: size of print buffer area
2892 *
2893 * Returns length of print buffer data string (or 0 if error)
2894 */
2895
2896static int link_stats(const char *name, char *buf, const u32 buf_size)
2897{
2898 struct print_buf pb;
2899 struct link *l_ptr;
2900 struct node *node;
2901 char *status;
2902 u32 profile_total = 0;
2903
2904 if (!strcmp(name, bc_link_name))
2905 return bclink_stats(buf, buf_size);
2906
2907 printbuf_init(&pb, buf, buf_size);
2908
2909 read_lock_bh(&net_lock);
2910 l_ptr = link_find_link(name, &node);
2911 if (!l_ptr) {
2912 read_unlock_bh(&net_lock);
2913 return 0;
2914 }
2915 node_lock(node);
2916
2917 if (link_is_active(l_ptr))
2918 status = "ACTIVE";
2919 else if (link_is_up(l_ptr))
2920 status = "STANDBY";
2921 else
2922 status = "DEFUNCT";
2923 tipc_printf(&pb, "Link <%s>\n"
2924 " %s MTU:%u Priority:%u Tolerance:%u ms"
2925 " Window:%u packets\n",
2926 l_ptr->name, status, link_max_pkt(l_ptr),
2927 l_ptr->priority, l_ptr->tolerance, l_ptr->queue_limit[0]);
2928 tipc_printf(&pb, " RX packets:%u fragments:%u/%u bundles:%u/%u\n",
2929 l_ptr->next_in_no - l_ptr->stats.recv_info,
2930 l_ptr->stats.recv_fragments,
2931 l_ptr->stats.recv_fragmented,
2932 l_ptr->stats.recv_bundles,
2933 l_ptr->stats.recv_bundled);
2934 tipc_printf(&pb, " TX packets:%u fragments:%u/%u bundles:%u/%u\n",
2935 l_ptr->next_out_no - l_ptr->stats.sent_info,
2936 l_ptr->stats.sent_fragments,
2937 l_ptr->stats.sent_fragmented,
2938 l_ptr->stats.sent_bundles,
2939 l_ptr->stats.sent_bundled);
2940 profile_total = l_ptr->stats.msg_length_counts;
2941 if (!profile_total)
2942 profile_total = 1;
2943 tipc_printf(&pb, " TX profile sample:%u packets average:%u octets\n"
2944 " 0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% "
2945 "-16354:%u%% -32768:%u%% -66000:%u%%\n",
2946 l_ptr->stats.msg_length_counts,
2947 l_ptr->stats.msg_lengths_total / profile_total,
2948 percent(l_ptr->stats.msg_length_profile[0], profile_total),
2949 percent(l_ptr->stats.msg_length_profile[1], profile_total),
2950 percent(l_ptr->stats.msg_length_profile[2], profile_total),
2951 percent(l_ptr->stats.msg_length_profile[3], profile_total),
2952 percent(l_ptr->stats.msg_length_profile[4], profile_total),
2953 percent(l_ptr->stats.msg_length_profile[5], profile_total),
2954 percent(l_ptr->stats.msg_length_profile[6], profile_total));
2955 tipc_printf(&pb, " RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
2956 l_ptr->stats.recv_states,
2957 l_ptr->stats.recv_probes,
2958 l_ptr->stats.recv_nacks,
2959 l_ptr->stats.deferred_recv,
2960 l_ptr->stats.duplicates);
2961 tipc_printf(&pb, " TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
2962 l_ptr->stats.sent_states,
2963 l_ptr->stats.sent_probes,
2964 l_ptr->stats.sent_nacks,
2965 l_ptr->stats.sent_acks,
2966 l_ptr->stats.retransmitted);
2967 tipc_printf(&pb, " Congestion bearer:%u link:%u Send queue max:%u avg:%u\n",
2968 l_ptr->stats.bearer_congs,
2969 l_ptr->stats.link_congs,
2970 l_ptr->stats.max_queue_sz,
2971 l_ptr->stats.queue_sz_counts
2972 ? (l_ptr->stats.accu_queue_sz / l_ptr->stats.queue_sz_counts)
2973 : 0);
2974
2975 node_unlock(node);
2976 read_unlock_bh(&net_lock);
2977 return printbuf_validate(&pb);
2978}
2979
2980#define MAX_LINK_STATS_INFO 2000
2981
2982struct sk_buff *link_cmd_show_stats(const void *req_tlv_area, int req_tlv_space)
2983{
2984 struct sk_buff *buf;
2985 struct tlv_desc *rep_tlv;
2986 int str_len;
2987
2988 if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_LINK_NAME))
2989 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
2990
2991 buf = cfg_reply_alloc(TLV_SPACE(MAX_LINK_STATS_INFO));
2992 if (!buf)
2993 return NULL;
2994
2995 rep_tlv = (struct tlv_desc *)buf->data;
2996
2997 str_len = link_stats((char *)TLV_DATA(req_tlv_area),
2998 (char *)TLV_DATA(rep_tlv), MAX_LINK_STATS_INFO);
2999 if (!str_len) {
3000 buf_discard(buf);
3001 return cfg_reply_error_string("link not found");
3002 }
3003
3004 skb_put(buf, TLV_SPACE(str_len));
3005 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
3006
3007 return buf;
3008}
3009
3010#if 0
3011int link_control(const char *name, u32 op, u32 val)
3012{
3013 int res = -EINVAL;
3014 struct link *l_ptr;
3015 u32 bearer_id;
3016 struct node * node;
3017 u32 a;
3018
3019 a = link_name2addr(name, &bearer_id);
3020 read_lock_bh(&net_lock);
3021 node = node_find(a);
3022 if (node) {
3023 node_lock(node);
3024 l_ptr = node->links[bearer_id];
3025 if (l_ptr) {
3026 if (op == TIPC_REMOVE_LINK) {
3027 struct bearer *b_ptr = l_ptr->b_ptr;
3028 spin_lock_bh(&b_ptr->publ.lock);
3029 link_delete(l_ptr);
3030 spin_unlock_bh(&b_ptr->publ.lock);
3031 }
3032 if (op == TIPC_CMD_BLOCK_LINK) {
3033 link_reset(l_ptr);
3034 l_ptr->blocked = 1;
3035 }
3036 if (op == TIPC_CMD_UNBLOCK_LINK) {
3037 l_ptr->blocked = 0;
3038 }
3039 res = TIPC_OK;
3040 }
3041 node_unlock(node);
3042 }
3043 read_unlock_bh(&net_lock);
3044 return res;
3045}
3046#endif
3047
3048/**
3049 * link_get_max_pkt - get maximum packet size to use when sending to destination
3050 * @dest: network address of destination node
3051 * @selector: used to select from set of active links
3052 *
3053 * If no active link can be found, uses default maximum packet size.
3054 */
3055
3056u32 link_get_max_pkt(u32 dest, u32 selector)
3057{
3058 struct node *n_ptr;
3059 struct link *l_ptr;
3060 u32 res = MAX_PKT_DEFAULT;
3061
3062 if (dest == tipc_own_addr)
3063 return MAX_MSG_SIZE;
3064
3065 read_lock_bh(&net_lock);
3066 n_ptr = node_select(dest, selector);
3067 if (n_ptr) {
3068 node_lock(n_ptr);
3069 l_ptr = n_ptr->active_links[selector & 1];
3070 if (l_ptr)
3071 res = link_max_pkt(l_ptr);
3072 node_unlock(n_ptr);
3073 }
3074 read_unlock_bh(&net_lock);
3075 return res;
3076}
3077
3078#if 0
3079static void link_dump_rec_queue(struct link *l_ptr)
3080{
3081 struct sk_buff *crs;
3082
3083 if (!l_ptr->oldest_deferred_in) {
3084 info("Reception queue empty\n");
3085 return;
3086 }
3087 info("Contents of Reception queue:\n");
3088 crs = l_ptr->oldest_deferred_in;
3089 while (crs) {
3090 if (crs->data == (void *)0x0000a3a3) {
3091 info("buffer %x invalid\n", crs);
3092 return;
3093 }
3094 msg_dbg(buf_msg(crs), "In rec queue: \n");
3095 crs = crs->next;
3096 }
3097}
3098#endif
3099
3100static void link_dump_send_queue(struct link *l_ptr)
3101{
3102 if (l_ptr->next_out) {
3103 info("\nContents of unsent queue:\n");
3104 dbg_print_buf_chain(l_ptr->next_out);
3105 }
3106 info("\nContents of send queue:\n");
3107 if (l_ptr->first_out) {
3108 dbg_print_buf_chain(l_ptr->first_out);
3109 }
3110 info("Empty send queue\n");
3111}
3112
3113static void link_print(struct link *l_ptr, struct print_buf *buf,
3114 const char *str)
3115{
3116 tipc_printf(buf, str);
3117 if (link_reset_reset(l_ptr) || link_reset_unknown(l_ptr))
3118 return;
3119 tipc_printf(buf, "Link %x<%s>:",
3120 l_ptr->addr, l_ptr->b_ptr->publ.name);
3121 tipc_printf(buf, ": NXO(%u):", mod(l_ptr->next_out_no));
3122 tipc_printf(buf, "NXI(%u):", mod(l_ptr->next_in_no));
3123 tipc_printf(buf, "SQUE");
3124 if (l_ptr->first_out) {
3125 tipc_printf(buf, "[%u..", msg_seqno(buf_msg(l_ptr->first_out)));
3126 if (l_ptr->next_out)
3127 tipc_printf(buf, "%u..",
3128 msg_seqno(buf_msg(l_ptr->next_out)));
3129 tipc_printf(buf, "%u]",
3130 msg_seqno(buf_msg
3131 (l_ptr->last_out)), l_ptr->out_queue_size);
3132 if ((mod(msg_seqno(buf_msg(l_ptr->last_out)) -
3133 msg_seqno(buf_msg(l_ptr->first_out)))
3134 != (l_ptr->out_queue_size - 1))
3135 || (l_ptr->last_out->next != 0)) {
3136 tipc_printf(buf, "\nSend queue inconsistency\n");
3137 tipc_printf(buf, "first_out= %x ", l_ptr->first_out);
3138 tipc_printf(buf, "next_out= %x ", l_ptr->next_out);
3139 tipc_printf(buf, "last_out= %x ", l_ptr->last_out);
3140 link_dump_send_queue(l_ptr);
3141 }
3142 } else
3143 tipc_printf(buf, "[]");
3144 tipc_printf(buf, "SQSIZ(%u)", l_ptr->out_queue_size);
3145 if (l_ptr->oldest_deferred_in) {
3146 u32 o = msg_seqno(buf_msg(l_ptr->oldest_deferred_in));
3147 u32 n = msg_seqno(buf_msg(l_ptr->newest_deferred_in));
3148 tipc_printf(buf, ":RQUE[%u..%u]", o, n);
3149 if (l_ptr->deferred_inqueue_sz != mod((n + 1) - o)) {
3150 tipc_printf(buf, ":RQSIZ(%u)",
3151 l_ptr->deferred_inqueue_sz);
3152 }
3153 }
3154 if (link_working_unknown(l_ptr))
3155 tipc_printf(buf, ":WU");
3156 if (link_reset_reset(l_ptr))
3157 tipc_printf(buf, ":RR");
3158 if (link_reset_unknown(l_ptr))
3159 tipc_printf(buf, ":RU");
3160 if (link_working_working(l_ptr))
3161 tipc_printf(buf, ":WW");
3162 tipc_printf(buf, "\n");
3163}
3164
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 11:09:29 -0500