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Btrfs: fix meta data raid-repair merge problem
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / tipc / port.c
blob54d812a5a4d9dd272f330dcaa310c09d7499e29a
1 /*
2 * net/tipc/port.c: TIPC port code
3 *
4 * Copyright (c) 1992-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
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.
19 *
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
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37 #include "core.h"
38 #include "config.h"
39 #include "port.h"
40 #include "name_table.h"
41
42 /* Connection management: */
43 #define PROBING_INTERVAL 3600000 /* [ms] => 1 h */
44 #define CONFIRMED 0
45 #define PROBING 1
46
47 #define MAX_REJECT_SIZE 1024
48
49 static struct sk_buff *msg_queue_head;
50 static struct sk_buff *msg_queue_tail;
51
52 DEFINE_SPINLOCK(tipc_port_list_lock);
53 static DEFINE_SPINLOCK(queue_lock);
54
55 static LIST_HEAD(ports);
56 static void port_handle_node_down(unsigned long ref);
57 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *, u32 err);
58 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *, u32 err);
59 static void port_timeout(unsigned long ref);
60
61
62 static u32 port_peernode(struct tipc_port *p_ptr)
63 {
64 return msg_destnode(&p_ptr->phdr);
65 }
66
67 static u32 port_peerport(struct tipc_port *p_ptr)
68 {
69 return msg_destport(&p_ptr->phdr);
70 }
71
72 /**
73 * tipc_multicast - send a multicast message to local and remote destinations
74 */
75
76 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq,
77 u32 num_sect, struct iovec const *msg_sect,
78 unsigned int total_len)
79 {
80 struct tipc_msg *hdr;
81 struct sk_buff *buf;
82 struct sk_buff *ibuf = NULL;
83 struct port_list dports = {0, NULL, };
84 struct tipc_port *oport = tipc_port_deref(ref);
85 int ext_targets;
86 int res;
87
88 if (unlikely(!oport))
89 return -EINVAL;
90
91 /* Create multicast message */
92
93 hdr = &oport->phdr;
94 msg_set_type(hdr, TIPC_MCAST_MSG);
95 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
96 msg_set_destport(hdr, 0);
97 msg_set_destnode(hdr, 0);
98 msg_set_nametype(hdr, seq->type);
99 msg_set_namelower(hdr, seq->lower);
100 msg_set_nameupper(hdr, seq->upper);
101 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
102 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
103 !oport->user_port, &buf);
104 if (unlikely(!buf))
105 return res;
106
107 /* Figure out where to send multicast message */
108
109 ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
110 TIPC_NODE_SCOPE, &dports);
111
112 /* Send message to destinations (duplicate it only if necessary) */
113
114 if (ext_targets) {
115 if (dports.count != 0) {
116 ibuf = skb_copy(buf, GFP_ATOMIC);
117 if (ibuf == NULL) {
118 tipc_port_list_free(&dports);
119 buf_discard(buf);
120 return -ENOMEM;
121 }
122 }
123 res = tipc_bclink_send_msg(buf);
124 if ((res < 0) && (dports.count != 0))
125 buf_discard(ibuf);
126 } else {
127 ibuf = buf;
128 }
129
130 if (res >= 0) {
131 if (ibuf)
132 tipc_port_recv_mcast(ibuf, &dports);
133 } else {
134 tipc_port_list_free(&dports);
135 }
136 return res;
137 }
138
139 /**
140 * tipc_port_recv_mcast - deliver multicast message to all destination ports
141 *
142 * If there is no port list, perform a lookup to create one
143 */
144
145 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
146 {
147 struct tipc_msg *msg;
148 struct port_list dports = {0, NULL, };
149 struct port_list *item = dp;
150 int cnt = 0;
151
152 msg = buf_msg(buf);
153
154 /* Create destination port list, if one wasn't supplied */
155
156 if (dp == NULL) {
157 tipc_nametbl_mc_translate(msg_nametype(msg),
158 msg_namelower(msg),
159 msg_nameupper(msg),
160 TIPC_CLUSTER_SCOPE,
161 &dports);
162 item = dp = &dports;
163 }
164
165 /* Deliver a copy of message to each destination port */
166
167 if (dp->count != 0) {
168 msg_set_destnode(msg, tipc_own_addr);
169 if (dp->count == 1) {
170 msg_set_destport(msg, dp->ports[0]);
171 tipc_port_recv_msg(buf);
172 tipc_port_list_free(dp);
173 return;
174 }
175 for (; cnt < dp->count; cnt++) {
176 int index = cnt % PLSIZE;
177 struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
178
179 if (b == NULL) {
180 warn("Unable to deliver multicast message(s)\n");
181 goto exit;
182 }
183 if ((index == 0) && (cnt != 0))
184 item = item->next;
185 msg_set_destport(buf_msg(b), item->ports[index]);
186 tipc_port_recv_msg(b);
187 }
188 }
189 exit:
190 buf_discard(buf);
191 tipc_port_list_free(dp);
192 }
193
194 /**
195 * tipc_createport_raw - create a generic TIPC port
196 *
197 * Returns pointer to (locked) TIPC port, or NULL if unable to create it
198 */
199
200 struct tipc_port *tipc_createport_raw(void *usr_handle,
201 u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
202 void (*wakeup)(struct tipc_port *),
203 const u32 importance)
204 {
205 struct tipc_port *p_ptr;
206 struct tipc_msg *msg;
207 u32 ref;
208
209 p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
210 if (!p_ptr) {
211 warn("Port creation failed, no memory\n");
212 return NULL;
213 }
214 ref = tipc_ref_acquire(p_ptr, &p_ptr->lock);
215 if (!ref) {
216 warn("Port creation failed, reference table exhausted\n");
217 kfree(p_ptr);
218 return NULL;
219 }
220
221 p_ptr->usr_handle = usr_handle;
222 p_ptr->max_pkt = MAX_PKT_DEFAULT;
223 p_ptr->ref = ref;
224 msg = &p_ptr->phdr;
225 tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
226 msg_set_origport(msg, ref);
227 INIT_LIST_HEAD(&p_ptr->wait_list);
228 INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
229 p_ptr->dispatcher = dispatcher;
230 p_ptr->wakeup = wakeup;
231 p_ptr->user_port = NULL;
232 k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
233 spin_lock_bh(&tipc_port_list_lock);
234 INIT_LIST_HEAD(&p_ptr->publications);
235 INIT_LIST_HEAD(&p_ptr->port_list);
236 list_add_tail(&p_ptr->port_list, &ports);
237 spin_unlock_bh(&tipc_port_list_lock);
238 return p_ptr;
239 }
240
241 int tipc_deleteport(u32 ref)
242 {
243 struct tipc_port *p_ptr;
244 struct sk_buff *buf = NULL;
245
246 tipc_withdraw(ref, 0, NULL);
247 p_ptr = tipc_port_lock(ref);
248 if (!p_ptr)
249 return -EINVAL;
250
251 tipc_ref_discard(ref);
252 tipc_port_unlock(p_ptr);
253
254 k_cancel_timer(&p_ptr->timer);
255 if (p_ptr->connected) {
256 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
257 tipc_nodesub_unsubscribe(&p_ptr->subscription);
258 }
259 kfree(p_ptr->user_port);
260
261 spin_lock_bh(&tipc_port_list_lock);
262 list_del(&p_ptr->port_list);
263 list_del(&p_ptr->wait_list);
264 spin_unlock_bh(&tipc_port_list_lock);
265 k_term_timer(&p_ptr->timer);
266 kfree(p_ptr);
267 tipc_net_route_msg(buf);
268 return 0;
269 }
270
271 static int port_unreliable(struct tipc_port *p_ptr)
272 {
273 return msg_src_droppable(&p_ptr->phdr);
274 }
275
276 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
277 {
278 struct tipc_port *p_ptr;
279
280 p_ptr = tipc_port_lock(ref);
281 if (!p_ptr)
282 return -EINVAL;
283 *isunreliable = port_unreliable(p_ptr);
284 tipc_port_unlock(p_ptr);
285 return 0;
286 }
287
288 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
289 {
290 struct tipc_port *p_ptr;
291
292 p_ptr = tipc_port_lock(ref);
293 if (!p_ptr)
294 return -EINVAL;
295 msg_set_src_droppable(&p_ptr->phdr, (isunreliable != 0));
296 tipc_port_unlock(p_ptr);
297 return 0;
298 }
299
300 static int port_unreturnable(struct tipc_port *p_ptr)
301 {
302 return msg_dest_droppable(&p_ptr->phdr);
303 }
304
305 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
306 {
307 struct tipc_port *p_ptr;
308
309 p_ptr = tipc_port_lock(ref);
310 if (!p_ptr)
311 return -EINVAL;
312 *isunrejectable = port_unreturnable(p_ptr);
313 tipc_port_unlock(p_ptr);
314 return 0;
315 }
316
317 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
318 {
319 struct tipc_port *p_ptr;
320
321 p_ptr = tipc_port_lock(ref);
322 if (!p_ptr)
323 return -EINVAL;
324 msg_set_dest_droppable(&p_ptr->phdr, (isunrejectable != 0));
325 tipc_port_unlock(p_ptr);
326 return 0;
327 }
328
329 /*
330 * port_build_proto_msg(): create connection protocol message for port
331 *
332 * On entry the port must be locked and connected.
333 */
334 static struct sk_buff *port_build_proto_msg(struct tipc_port *p_ptr,
335 u32 type, u32 ack)
336 {
337 struct sk_buff *buf;
338 struct tipc_msg *msg;
339
340 buf = tipc_buf_acquire(INT_H_SIZE);
341 if (buf) {
342 msg = buf_msg(buf);
343 tipc_msg_init(msg, CONN_MANAGER, type, INT_H_SIZE,
344 port_peernode(p_ptr));
345 msg_set_destport(msg, port_peerport(p_ptr));
346 msg_set_origport(msg, p_ptr->ref);
347 msg_set_msgcnt(msg, ack);
348 }
349 return buf;
350 }
351
352 int tipc_reject_msg(struct sk_buff *buf, u32 err)
353 {
354 struct tipc_msg *msg = buf_msg(buf);
355 struct sk_buff *rbuf;
356 struct tipc_msg *rmsg;
357 int hdr_sz;
358 u32 imp;
359 u32 data_sz = msg_data_sz(msg);
360 u32 src_node;
361 u32 rmsg_sz;
362
363 /* discard rejected message if it shouldn't be returned to sender */
364
365 if (WARN(!msg_isdata(msg),
366 "attempt to reject message with user=%u", msg_user(msg))) {
367 dump_stack();
368 goto exit;
369 }
370 if (msg_errcode(msg) || msg_dest_droppable(msg))
371 goto exit;
372
373 /*
374 * construct returned message by copying rejected message header and
375 * data (or subset), then updating header fields that need adjusting
376 */
377
378 hdr_sz = msg_hdr_sz(msg);
379 rmsg_sz = hdr_sz + min_t(u32, data_sz, MAX_REJECT_SIZE);
380
381 rbuf = tipc_buf_acquire(rmsg_sz);
382 if (rbuf == NULL)
383 goto exit;
384
385 rmsg = buf_msg(rbuf);
386 skb_copy_to_linear_data(rbuf, msg, rmsg_sz);
387
388 if (msg_connected(rmsg)) {
389 imp = msg_importance(rmsg);
390 if (imp < TIPC_CRITICAL_IMPORTANCE)
391 msg_set_importance(rmsg, ++imp);
392 }
393 msg_set_non_seq(rmsg, 0);
394 msg_set_size(rmsg, rmsg_sz);
395 msg_set_errcode(rmsg, err);
396 msg_set_prevnode(rmsg, tipc_own_addr);
397 msg_swap_words(rmsg, 4, 5);
398 if (!msg_short(rmsg))
399 msg_swap_words(rmsg, 6, 7);
400
401 /* send self-abort message when rejecting on a connected port */
402 if (msg_connected(msg)) {
403 struct sk_buff *abuf = NULL;
404 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
405
406 if (p_ptr) {
407 if (p_ptr->connected)
408 abuf = port_build_self_abort_msg(p_ptr, err);
409 tipc_port_unlock(p_ptr);
410 }
411 tipc_net_route_msg(abuf);
412 }
413
414 /* send returned message & dispose of rejected message */
415
416 src_node = msg_prevnode(msg);
417 if (src_node == tipc_own_addr)
418 tipc_port_recv_msg(rbuf);
419 else
420 tipc_link_send(rbuf, src_node, msg_link_selector(rmsg));
421 exit:
422 buf_discard(buf);
423 return data_sz;
424 }
425
426 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
427 struct iovec const *msg_sect, u32 num_sect,
428 unsigned int total_len, int err)
429 {
430 struct sk_buff *buf;
431 int res;
432
433 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
434 !p_ptr->user_port, &buf);
435 if (!buf)
436 return res;
437
438 return tipc_reject_msg(buf, err);
439 }
440
441 static void port_timeout(unsigned long ref)
442 {
443 struct tipc_port *p_ptr = tipc_port_lock(ref);
444 struct sk_buff *buf = NULL;
445
446 if (!p_ptr)
447 return;
448
449 if (!p_ptr->connected) {
450 tipc_port_unlock(p_ptr);
451 return;
452 }
453
454 /* Last probe answered ? */
455 if (p_ptr->probing_state == PROBING) {
456 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
457 } else {
458 buf = port_build_proto_msg(p_ptr, CONN_PROBE, 0);
459 p_ptr->probing_state = PROBING;
460 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
461 }
462 tipc_port_unlock(p_ptr);
463 tipc_net_route_msg(buf);
464 }
465
466
467 static void port_handle_node_down(unsigned long ref)
468 {
469 struct tipc_port *p_ptr = tipc_port_lock(ref);
470 struct sk_buff *buf = NULL;
471
472 if (!p_ptr)
473 return;
474 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
475 tipc_port_unlock(p_ptr);
476 tipc_net_route_msg(buf);
477 }
478
479
480 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
481 {
482 struct sk_buff *buf = port_build_peer_abort_msg(p_ptr, err);
483
484 if (buf) {
485 struct tipc_msg *msg = buf_msg(buf);
486 msg_swap_words(msg, 4, 5);
487 msg_swap_words(msg, 6, 7);
488 }
489 return buf;
490 }
491
492
493 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
494 {
495 struct sk_buff *buf;
496 struct tipc_msg *msg;
497 u32 imp;
498
499 if (!p_ptr->connected)
500 return NULL;
501
502 buf = tipc_buf_acquire(BASIC_H_SIZE);
503 if (buf) {
504 msg = buf_msg(buf);
505 memcpy(msg, &p_ptr->phdr, BASIC_H_SIZE);
506 msg_set_hdr_sz(msg, BASIC_H_SIZE);
507 msg_set_size(msg, BASIC_H_SIZE);
508 imp = msg_importance(msg);
509 if (imp < TIPC_CRITICAL_IMPORTANCE)
510 msg_set_importance(msg, ++imp);
511 msg_set_errcode(msg, err);
512 }
513 return buf;
514 }
515
516 void tipc_port_recv_proto_msg(struct sk_buff *buf)
517 {
518 struct tipc_msg *msg = buf_msg(buf);
519 struct tipc_port *p_ptr;
520 struct sk_buff *r_buf = NULL;
521 u32 orignode = msg_orignode(msg);
522 u32 origport = msg_origport(msg);
523 u32 destport = msg_destport(msg);
524 int wakeable;
525
526 /* Validate connection */
527
528 p_ptr = tipc_port_lock(destport);
529 if (!p_ptr || !p_ptr->connected ||
530 (port_peernode(p_ptr) != orignode) ||
531 (port_peerport(p_ptr) != origport)) {
532 r_buf = tipc_buf_acquire(BASIC_H_SIZE);
533 if (r_buf) {
534 msg = buf_msg(r_buf);
535 tipc_msg_init(msg, TIPC_HIGH_IMPORTANCE, TIPC_CONN_MSG,
536 BASIC_H_SIZE, orignode);
537 msg_set_errcode(msg, TIPC_ERR_NO_PORT);
538 msg_set_origport(msg, destport);
539 msg_set_destport(msg, origport);
540 }
541 if (p_ptr)
542 tipc_port_unlock(p_ptr);
543 goto exit;
544 }
545
546 /* Process protocol message sent by peer */
547
548 switch (msg_type(msg)) {
549 case CONN_ACK:
550 wakeable = tipc_port_congested(p_ptr) && p_ptr->congested &&
551 p_ptr->wakeup;
552 p_ptr->acked += msg_msgcnt(msg);
553 if (!tipc_port_congested(p_ptr)) {
554 p_ptr->congested = 0;
555 if (wakeable)
556 p_ptr->wakeup(p_ptr);
557 }
558 break;
559 case CONN_PROBE:
560 r_buf = port_build_proto_msg(p_ptr, CONN_PROBE_REPLY, 0);
561 break;
562 default:
563 /* CONN_PROBE_REPLY or unrecognized - no action required */
564 break;
565 }
566 p_ptr->probing_state = CONFIRMED;
567 tipc_port_unlock(p_ptr);
568 exit:
569 tipc_net_route_msg(r_buf);
570 buf_discard(buf);
571 }
572
573 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
574 {
575 struct publication *publ;
576
577 if (full_id)
578 tipc_printf(buf, "<%u.%u.%u:%u>:",
579 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
580 tipc_node(tipc_own_addr), p_ptr->ref);
581 else
582 tipc_printf(buf, "%-10u:", p_ptr->ref);
583
584 if (p_ptr->connected) {
585 u32 dport = port_peerport(p_ptr);
586 u32 destnode = port_peernode(p_ptr);
587
588 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
589 tipc_zone(destnode), tipc_cluster(destnode),
590 tipc_node(destnode), dport);
591 if (p_ptr->conn_type != 0)
592 tipc_printf(buf, " via {%u,%u}",
593 p_ptr->conn_type,
594 p_ptr->conn_instance);
595 } else if (p_ptr->published) {
596 tipc_printf(buf, " bound to");
597 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
598 if (publ->lower == publ->upper)
599 tipc_printf(buf, " {%u,%u}", publ->type,
600 publ->lower);
601 else
602 tipc_printf(buf, " {%u,%u,%u}", publ->type,
603 publ->lower, publ->upper);
604 }
605 }
606 tipc_printf(buf, "\n");
607 }
608
609 #define MAX_PORT_QUERY 32768
610
611 struct sk_buff *tipc_port_get_ports(void)
612 {
613 struct sk_buff *buf;
614 struct tlv_desc *rep_tlv;
615 struct print_buf pb;
616 struct tipc_port *p_ptr;
617 int str_len;
618
619 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
620 if (!buf)
621 return NULL;
622 rep_tlv = (struct tlv_desc *)buf->data;
623
624 tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
625 spin_lock_bh(&tipc_port_list_lock);
626 list_for_each_entry(p_ptr, &ports, port_list) {
627 spin_lock_bh(p_ptr->lock);
628 port_print(p_ptr, &pb, 0);
629 spin_unlock_bh(p_ptr->lock);
630 }
631 spin_unlock_bh(&tipc_port_list_lock);
632 str_len = tipc_printbuf_validate(&pb);
633
634 skb_put(buf, TLV_SPACE(str_len));
635 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
636
637 return buf;
638 }
639
640 void tipc_port_reinit(void)
641 {
642 struct tipc_port *p_ptr;
643 struct tipc_msg *msg;
644
645 spin_lock_bh(&tipc_port_list_lock);
646 list_for_each_entry(p_ptr, &ports, port_list) {
647 msg = &p_ptr->phdr;
648 if (msg_orignode(msg) == tipc_own_addr)
649 break;
650 msg_set_prevnode(msg, tipc_own_addr);
651 msg_set_orignode(msg, tipc_own_addr);
652 }
653 spin_unlock_bh(&tipc_port_list_lock);
654 }
655
656
657 /*
658 * port_dispatcher_sigh(): Signal handler for messages destinated
659 * to the tipc_port interface.
660 */
661
662 static void port_dispatcher_sigh(void *dummy)
663 {
664 struct sk_buff *buf;
665
666 spin_lock_bh(&queue_lock);
667 buf = msg_queue_head;
668 msg_queue_head = NULL;
669 spin_unlock_bh(&queue_lock);
670
671 while (buf) {
672 struct tipc_port *p_ptr;
673 struct user_port *up_ptr;
674 struct tipc_portid orig;
675 struct tipc_name_seq dseq;
676 void *usr_handle;
677 int connected;
678 int published;
679 u32 message_type;
680
681 struct sk_buff *next = buf->next;
682 struct tipc_msg *msg = buf_msg(buf);
683 u32 dref = msg_destport(msg);
684
685 message_type = msg_type(msg);
686 if (message_type > TIPC_DIRECT_MSG)
687 goto reject; /* Unsupported message type */
688
689 p_ptr = tipc_port_lock(dref);
690 if (!p_ptr)
691 goto reject; /* Port deleted while msg in queue */
692
693 orig.ref = msg_origport(msg);
694 orig.node = msg_orignode(msg);
695 up_ptr = p_ptr->user_port;
696 usr_handle = up_ptr->usr_handle;
697 connected = p_ptr->connected;
698 published = p_ptr->published;
699
700 if (unlikely(msg_errcode(msg)))
701 goto err;
702
703 switch (message_type) {
704
705 case TIPC_CONN_MSG:{
706 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
707 u32 peer_port = port_peerport(p_ptr);
708 u32 peer_node = port_peernode(p_ptr);
709 u32 dsz;
710
711 tipc_port_unlock(p_ptr);
712 if (unlikely(!cb))
713 goto reject;
714 if (unlikely(!connected)) {
715 if (tipc_connect2port(dref, &orig))
716 goto reject;
717 } else if ((msg_origport(msg) != peer_port) ||
718 (msg_orignode(msg) != peer_node))
719 goto reject;
720 dsz = msg_data_sz(msg);
721 if (unlikely(dsz &&
722 (++p_ptr->conn_unacked >=
723 TIPC_FLOW_CONTROL_WIN)))
724 tipc_acknowledge(dref,
725 p_ptr->conn_unacked);
726 skb_pull(buf, msg_hdr_sz(msg));
727 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
728 break;
729 }
730 case TIPC_DIRECT_MSG:{
731 tipc_msg_event cb = up_ptr->msg_cb;
732
733 tipc_port_unlock(p_ptr);
734 if (unlikely(!cb || connected))
735 goto reject;
736 skb_pull(buf, msg_hdr_sz(msg));
737 cb(usr_handle, dref, &buf, msg_data(msg),
738 msg_data_sz(msg), msg_importance(msg),
739 &orig);
740 break;
741 }
742 case TIPC_MCAST_MSG:
743 case TIPC_NAMED_MSG:{
744 tipc_named_msg_event cb = up_ptr->named_msg_cb;
745
746 tipc_port_unlock(p_ptr);
747 if (unlikely(!cb || connected || !published))
748 goto reject;
749 dseq.type = msg_nametype(msg);
750 dseq.lower = msg_nameinst(msg);
751 dseq.upper = (message_type == TIPC_NAMED_MSG)
752 ? dseq.lower : msg_nameupper(msg);
753 skb_pull(buf, msg_hdr_sz(msg));
754 cb(usr_handle, dref, &buf, msg_data(msg),
755 msg_data_sz(msg), msg_importance(msg),
756 &orig, &dseq);
757 break;
758 }
759 }
760 if (buf)
761 buf_discard(buf);
762 buf = next;
763 continue;
764 err:
765 switch (message_type) {
766
767 case TIPC_CONN_MSG:{
768 tipc_conn_shutdown_event cb =
769 up_ptr->conn_err_cb;
770 u32 peer_port = port_peerport(p_ptr);
771 u32 peer_node = port_peernode(p_ptr);
772
773 tipc_port_unlock(p_ptr);
774 if (!cb || !connected)
775 break;
776 if ((msg_origport(msg) != peer_port) ||
777 (msg_orignode(msg) != peer_node))
778 break;
779 tipc_disconnect(dref);
780 skb_pull(buf, msg_hdr_sz(msg));
781 cb(usr_handle, dref, &buf, msg_data(msg),
782 msg_data_sz(msg), msg_errcode(msg));
783 break;
784 }
785 case TIPC_DIRECT_MSG:{
786 tipc_msg_err_event cb = up_ptr->err_cb;
787
788 tipc_port_unlock(p_ptr);
789 if (!cb || connected)
790 break;
791 skb_pull(buf, msg_hdr_sz(msg));
792 cb(usr_handle, dref, &buf, msg_data(msg),
793 msg_data_sz(msg), msg_errcode(msg), &orig);
794 break;
795 }
796 case TIPC_MCAST_MSG:
797 case TIPC_NAMED_MSG:{
798 tipc_named_msg_err_event cb =
799 up_ptr->named_err_cb;
800
801 tipc_port_unlock(p_ptr);
802 if (!cb || connected)
803 break;
804 dseq.type = msg_nametype(msg);
805 dseq.lower = msg_nameinst(msg);
806 dseq.upper = (message_type == TIPC_NAMED_MSG)
807 ? dseq.lower : msg_nameupper(msg);
808 skb_pull(buf, msg_hdr_sz(msg));
809 cb(usr_handle, dref, &buf, msg_data(msg),
810 msg_data_sz(msg), msg_errcode(msg), &dseq);
811 break;
812 }
813 }
814 if (buf)
815 buf_discard(buf);
816 buf = next;
817 continue;
818 reject:
819 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
820 buf = next;
821 }
822 }
823
824 /*
825 * port_dispatcher(): Dispatcher for messages destinated
826 * to the tipc_port interface. Called with port locked.
827 */
828
829 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
830 {
831 buf->next = NULL;
832 spin_lock_bh(&queue_lock);
833 if (msg_queue_head) {
834 msg_queue_tail->next = buf;
835 msg_queue_tail = buf;
836 } else {
837 msg_queue_tail = msg_queue_head = buf;
838 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
839 }
840 spin_unlock_bh(&queue_lock);
841 return 0;
842 }
843
844 /*
845 * Wake up port after congestion: Called with port locked,
846 *
847 */
848
849 static void port_wakeup_sh(unsigned long ref)
850 {
851 struct tipc_port *p_ptr;
852 struct user_port *up_ptr;
853 tipc_continue_event cb = NULL;
854 void *uh = NULL;
855
856 p_ptr = tipc_port_lock(ref);
857 if (p_ptr) {
858 up_ptr = p_ptr->user_port;
859 if (up_ptr) {
860 cb = up_ptr->continue_event_cb;
861 uh = up_ptr->usr_handle;
862 }
863 tipc_port_unlock(p_ptr);
864 }
865 if (cb)
866 cb(uh, ref);
867 }
868
869
870 static void port_wakeup(struct tipc_port *p_ptr)
871 {
872 tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
873 }
874
875 void tipc_acknowledge(u32 ref, u32 ack)
876 {
877 struct tipc_port *p_ptr;
878 struct sk_buff *buf = NULL;
879
880 p_ptr = tipc_port_lock(ref);
881 if (!p_ptr)
882 return;
883 if (p_ptr->connected) {
884 p_ptr->conn_unacked -= ack;
885 buf = port_build_proto_msg(p_ptr, CONN_ACK, ack);
886 }
887 tipc_port_unlock(p_ptr);
888 tipc_net_route_msg(buf);
889 }
890
891 /*
892 * tipc_createport(): user level call.
893 */
894
895 int tipc_createport(void *usr_handle,
896 unsigned int importance,
897 tipc_msg_err_event error_cb,
898 tipc_named_msg_err_event named_error_cb,
899 tipc_conn_shutdown_event conn_error_cb,
900 tipc_msg_event msg_cb,
901 tipc_named_msg_event named_msg_cb,
902 tipc_conn_msg_event conn_msg_cb,
903 tipc_continue_event continue_event_cb,/* May be zero */
904 u32 *portref)
905 {
906 struct user_port *up_ptr;
907 struct tipc_port *p_ptr;
908
909 up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
910 if (!up_ptr) {
911 warn("Port creation failed, no memory\n");
912 return -ENOMEM;
913 }
914 p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
915 port_wakeup, importance);
916 if (!p_ptr) {
917 kfree(up_ptr);
918 return -ENOMEM;
919 }
920
921 p_ptr->user_port = up_ptr;
922 up_ptr->usr_handle = usr_handle;
923 up_ptr->ref = p_ptr->ref;
924 up_ptr->err_cb = error_cb;
925 up_ptr->named_err_cb = named_error_cb;
926 up_ptr->conn_err_cb = conn_error_cb;
927 up_ptr->msg_cb = msg_cb;
928 up_ptr->named_msg_cb = named_msg_cb;
929 up_ptr->conn_msg_cb = conn_msg_cb;
930 up_ptr->continue_event_cb = continue_event_cb;
931 *portref = p_ptr->ref;
932 tipc_port_unlock(p_ptr);
933 return 0;
934 }
935
936 int tipc_portimportance(u32 ref, unsigned int *importance)
937 {
938 struct tipc_port *p_ptr;
939
940 p_ptr = tipc_port_lock(ref);
941 if (!p_ptr)
942 return -EINVAL;
943 *importance = (unsigned int)msg_importance(&p_ptr->phdr);
944 tipc_port_unlock(p_ptr);
945 return 0;
946 }
947
948 int tipc_set_portimportance(u32 ref, unsigned int imp)
949 {
950 struct tipc_port *p_ptr;
951
952 if (imp > TIPC_CRITICAL_IMPORTANCE)
953 return -EINVAL;
954
955 p_ptr = tipc_port_lock(ref);
956 if (!p_ptr)
957 return -EINVAL;
958 msg_set_importance(&p_ptr->phdr, (u32)imp);
959 tipc_port_unlock(p_ptr);
960 return 0;
961 }
962
963
964 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
965 {
966 struct tipc_port *p_ptr;
967 struct publication *publ;
968 u32 key;
969 int res = -EINVAL;
970
971 p_ptr = tipc_port_lock(ref);
972 if (!p_ptr)
973 return -EINVAL;
974
975 if (p_ptr->connected)
976 goto exit;
977 if (seq->lower > seq->upper)
978 goto exit;
979 if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
980 goto exit;
981 key = ref + p_ptr->pub_count + 1;
982 if (key == ref) {
983 res = -EADDRINUSE;
984 goto exit;
985 }
986 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
987 scope, p_ptr->ref, key);
988 if (publ) {
989 list_add(&publ->pport_list, &p_ptr->publications);
990 p_ptr->pub_count++;
991 p_ptr->published = 1;
992 res = 0;
993 }
994 exit:
995 tipc_port_unlock(p_ptr);
996 return res;
997 }
998
999 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1000 {
1001 struct tipc_port *p_ptr;
1002 struct publication *publ;
1003 struct publication *tpubl;
1004 int res = -EINVAL;
1005
1006 p_ptr = tipc_port_lock(ref);
1007 if (!p_ptr)
1008 return -EINVAL;
1009 if (!seq) {
1010 list_for_each_entry_safe(publ, tpubl,
1011 &p_ptr->publications, pport_list) {
1012 tipc_nametbl_withdraw(publ->type, publ->lower,
1013 publ->ref, publ->key);
1014 }
1015 res = 0;
1016 } else {
1017 list_for_each_entry_safe(publ, tpubl,
1018 &p_ptr->publications, pport_list) {
1019 if (publ->scope != scope)
1020 continue;
1021 if (publ->type != seq->type)
1022 continue;
1023 if (publ->lower != seq->lower)
1024 continue;
1025 if (publ->upper != seq->upper)
1026 break;
1027 tipc_nametbl_withdraw(publ->type, publ->lower,
1028 publ->ref, publ->key);
1029 res = 0;
1030 break;
1031 }
1032 }
1033 if (list_empty(&p_ptr->publications))
1034 p_ptr->published = 0;
1035 tipc_port_unlock(p_ptr);
1036 return res;
1037 }
1038
1039 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1040 {
1041 struct tipc_port *p_ptr;
1042 struct tipc_msg *msg;
1043 int res = -EINVAL;
1044
1045 p_ptr = tipc_port_lock(ref);
1046 if (!p_ptr)
1047 return -EINVAL;
1048 if (p_ptr->published || p_ptr->connected)
1049 goto exit;
1050 if (!peer->ref)
1051 goto exit;
1052
1053 msg = &p_ptr->phdr;
1054 msg_set_destnode(msg, peer->node);
1055 msg_set_destport(msg, peer->ref);
1056 msg_set_orignode(msg, tipc_own_addr);
1057 msg_set_origport(msg, p_ptr->ref);
1058 msg_set_type(msg, TIPC_CONN_MSG);
1059 msg_set_lookup_scope(msg, 0);
1060 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1061
1062 p_ptr->probing_interval = PROBING_INTERVAL;
1063 p_ptr->probing_state = CONFIRMED;
1064 p_ptr->connected = 1;
1065 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1066
1067 tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1068 (void *)(unsigned long)ref,
1069 (net_ev_handler)port_handle_node_down);
1070 res = 0;
1071 exit:
1072 tipc_port_unlock(p_ptr);
1073 p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1074 return res;
1075 }
1076
1077 /**
1078 * tipc_disconnect_port - disconnect port from peer
1079 *
1080 * Port must be locked.
1081 */
1082
1083 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1084 {
1085 int res;
1086
1087 if (tp_ptr->connected) {
1088 tp_ptr->connected = 0;
1089 /* let timer expire on it's own to avoid deadlock! */
1090 tipc_nodesub_unsubscribe(
1091 &((struct tipc_port *)tp_ptr)->subscription);
1092 res = 0;
1093 } else {
1094 res = -ENOTCONN;
1095 }
1096 return res;
1097 }
1098
1099 /*
1100 * tipc_disconnect(): Disconnect port form peer.
1101 * This is a node local operation.
1102 */
1103
1104 int tipc_disconnect(u32 ref)
1105 {
1106 struct tipc_port *p_ptr;
1107 int res;
1108
1109 p_ptr = tipc_port_lock(ref);
1110 if (!p_ptr)
1111 return -EINVAL;
1112 res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1113 tipc_port_unlock(p_ptr);
1114 return res;
1115 }
1116
1117 /*
1118 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1119 */
1120 int tipc_shutdown(u32 ref)
1121 {
1122 struct tipc_port *p_ptr;
1123 struct sk_buff *buf = NULL;
1124
1125 p_ptr = tipc_port_lock(ref);
1126 if (!p_ptr)
1127 return -EINVAL;
1128
1129 buf = port_build_peer_abort_msg(p_ptr, TIPC_CONN_SHUTDOWN);
1130 tipc_port_unlock(p_ptr);
1131 tipc_net_route_msg(buf);
1132 return tipc_disconnect(ref);
1133 }
1134
1135 /*
1136 * tipc_port_recv_sections(): Concatenate and deliver sectioned
1137 * message for this node.
1138 */
1139
1140 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1141 struct iovec const *msg_sect,
1142 unsigned int total_len)
1143 {
1144 struct sk_buff *buf;
1145 int res;
1146
1147 res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1148 MAX_MSG_SIZE, !sender->user_port, &buf);
1149 if (likely(buf))
1150 tipc_port_recv_msg(buf);
1151 return res;
1152 }
1153
1154 /**
1155 * tipc_send - send message sections on connection
1156 */
1157
1158 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1159 unsigned int total_len)
1160 {
1161 struct tipc_port *p_ptr;
1162 u32 destnode;
1163 int res;
1164
1165 p_ptr = tipc_port_deref(ref);
1166 if (!p_ptr || !p_ptr->connected)
1167 return -EINVAL;
1168
1169 p_ptr->congested = 1;
1170 if (!tipc_port_congested(p_ptr)) {
1171 destnode = port_peernode(p_ptr);
1172 if (likely(destnode != tipc_own_addr))
1173 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1174 total_len, destnode);
1175 else
1176 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1177 total_len);
1178
1179 if (likely(res != -ELINKCONG)) {
1180 p_ptr->congested = 0;
1181 if (res > 0)
1182 p_ptr->sent++;
1183 return res;
1184 }
1185 }
1186 if (port_unreliable(p_ptr)) {
1187 p_ptr->congested = 0;
1188 return total_len;
1189 }
1190 return -ELINKCONG;
1191 }
1192
1193 /**
1194 * tipc_send2name - send message sections to port name
1195 */
1196
1197 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1198 unsigned int num_sect, struct iovec const *msg_sect,
1199 unsigned int total_len)
1200 {
1201 struct tipc_port *p_ptr;
1202 struct tipc_msg *msg;
1203 u32 destnode = domain;
1204 u32 destport;
1205 int res;
1206
1207 p_ptr = tipc_port_deref(ref);
1208 if (!p_ptr || p_ptr->connected)
1209 return -EINVAL;
1210
1211 msg = &p_ptr->phdr;
1212 msg_set_type(msg, TIPC_NAMED_MSG);
1213 msg_set_orignode(msg, tipc_own_addr);
1214 msg_set_origport(msg, ref);
1215 msg_set_hdr_sz(msg, NAMED_H_SIZE);
1216 msg_set_nametype(msg, name->type);
1217 msg_set_nameinst(msg, name->instance);
1218 msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1219 destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1220 msg_set_destnode(msg, destnode);
1221 msg_set_destport(msg, destport);
1222
1223 if (likely(destport)) {
1224 if (likely(destnode == tipc_own_addr))
1225 res = tipc_port_recv_sections(p_ptr, num_sect,
1226 msg_sect, total_len);
1227 else
1228 res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1229 num_sect, total_len,
1230 destnode);
1231 if (likely(res != -ELINKCONG)) {
1232 if (res > 0)
1233 p_ptr->sent++;
1234 return res;
1235 }
1236 if (port_unreliable(p_ptr)) {
1237 return total_len;
1238 }
1239 return -ELINKCONG;
1240 }
1241 return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1242 total_len, TIPC_ERR_NO_NAME);
1243 }
1244
1245 /**
1246 * tipc_send2port - send message sections to port identity
1247 */
1248
1249 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1250 unsigned int num_sect, struct iovec const *msg_sect,
1251 unsigned int total_len)
1252 {
1253 struct tipc_port *p_ptr;
1254 struct tipc_msg *msg;
1255 int res;
1256
1257 p_ptr = tipc_port_deref(ref);
1258 if (!p_ptr || p_ptr->connected)
1259 return -EINVAL;
1260
1261 msg = &p_ptr->phdr;
1262 msg_set_type(msg, TIPC_DIRECT_MSG);
1263 msg_set_lookup_scope(msg, 0);
1264 msg_set_orignode(msg, tipc_own_addr);
1265 msg_set_origport(msg, ref);
1266 msg_set_destnode(msg, dest->node);
1267 msg_set_destport(msg, dest->ref);
1268 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1269
1270 if (dest->node == tipc_own_addr)
1271 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1272 total_len);
1273 else
1274 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1275 total_len, dest->node);
1276 if (likely(res != -ELINKCONG)) {
1277 if (res > 0)
1278 p_ptr->sent++;
1279 return res;
1280 }
1281 if (port_unreliable(p_ptr)) {
1282 return total_len;
1283 }
1284 return -ELINKCONG;
1285 }
1286
1287 /**
1288 * tipc_send_buf2port - send message buffer to port identity
1289 */
1290
1291 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1292 struct sk_buff *buf, unsigned int dsz)
1293 {
1294 struct tipc_port *p_ptr;
1295 struct tipc_msg *msg;
1296 int res;
1297
1298 p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1299 if (!p_ptr || p_ptr->connected)
1300 return -EINVAL;
1301
1302 msg = &p_ptr->phdr;
1303 msg_set_type(msg, TIPC_DIRECT_MSG);
1304 msg_set_orignode(msg, tipc_own_addr);
1305 msg_set_origport(msg, ref);
1306 msg_set_destnode(msg, dest->node);
1307 msg_set_destport(msg, dest->ref);
1308 msg_set_hdr_sz(msg, BASIC_H_SIZE);
1309 msg_set_size(msg, BASIC_H_SIZE + dsz);
1310 if (skb_cow(buf, BASIC_H_SIZE))
1311 return -ENOMEM;
1312
1313 skb_push(buf, BASIC_H_SIZE);
1314 skb_copy_to_linear_data(buf, msg, BASIC_H_SIZE);
1315
1316 if (dest->node == tipc_own_addr)
1317 res = tipc_port_recv_msg(buf);
1318 else
1319 res = tipc_send_buf_fast(buf, dest->node);
1320 if (likely(res != -ELINKCONG)) {
1321 if (res > 0)
1322 p_ptr->sent++;
1323 return res;
1324 }
1325 if (port_unreliable(p_ptr))
1326 return dsz;
1327 return -ELINKCONG;
1328 }
1329
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree