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drivers/misc/ioc4.c: fix section mismatch / race condition
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / tipc / port.c
blobc68dc956a4234e5759b53d5e3e460e61d882b171
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, LONG_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(): build a port level protocol
331 * or a connection abortion message. Called with
332 * tipc_port lock on.
333 */
334 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
335 u32 origport, u32 orignode,
336 u32 usr, u32 type, u32 err,
337 u32 ack)
338 {
339 struct sk_buff *buf;
340 struct tipc_msg *msg;
341
342 buf = tipc_buf_acquire(LONG_H_SIZE);
343 if (buf) {
344 msg = buf_msg(buf);
345 tipc_msg_init(msg, usr, type, LONG_H_SIZE, destnode);
346 msg_set_errcode(msg, err);
347 msg_set_destport(msg, destport);
348 msg_set_origport(msg, origport);
349 msg_set_orignode(msg, orignode);
350 msg_set_msgcnt(msg, ack);
351 }
352 return buf;
353 }
354
355 int tipc_reject_msg(struct sk_buff *buf, u32 err)
356 {
357 struct tipc_msg *msg = buf_msg(buf);
358 struct sk_buff *rbuf;
359 struct tipc_msg *rmsg;
360 int hdr_sz;
361 u32 imp = msg_importance(msg);
362 u32 data_sz = msg_data_sz(msg);
363
364 if (data_sz > MAX_REJECT_SIZE)
365 data_sz = MAX_REJECT_SIZE;
366 if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
367 imp++;
368
369 /* discard rejected message if it shouldn't be returned to sender */
370 if (msg_errcode(msg) || msg_dest_droppable(msg)) {
371 buf_discard(buf);
372 return data_sz;
373 }
374
375 /* construct rejected message */
376 if (msg_mcast(msg))
377 hdr_sz = MCAST_H_SIZE;
378 else
379 hdr_sz = LONG_H_SIZE;
380 rbuf = tipc_buf_acquire(data_sz + hdr_sz);
381 if (rbuf == NULL) {
382 buf_discard(buf);
383 return data_sz;
384 }
385 rmsg = buf_msg(rbuf);
386 tipc_msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
387 msg_set_errcode(rmsg, err);
388 msg_set_destport(rmsg, msg_origport(msg));
389 msg_set_origport(rmsg, msg_destport(msg));
390 if (msg_short(msg)) {
391 msg_set_orignode(rmsg, tipc_own_addr);
392 /* leave name type & instance as zeroes */
393 } else {
394 msg_set_orignode(rmsg, msg_destnode(msg));
395 msg_set_nametype(rmsg, msg_nametype(msg));
396 msg_set_nameinst(rmsg, msg_nameinst(msg));
397 }
398 msg_set_size(rmsg, data_sz + hdr_sz);
399 skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
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 rejected message */
415 buf_discard(buf);
416 tipc_net_route_msg(rbuf);
417 return data_sz;
418 }
419
420 int tipc_port_reject_sections(struct tipc_port *p_ptr, struct tipc_msg *hdr,
421 struct iovec const *msg_sect, u32 num_sect,
422 unsigned int total_len, int err)
423 {
424 struct sk_buff *buf;
425 int res;
426
427 res = tipc_msg_build(hdr, msg_sect, num_sect, total_len, MAX_MSG_SIZE,
428 !p_ptr->user_port, &buf);
429 if (!buf)
430 return res;
431
432 return tipc_reject_msg(buf, err);
433 }
434
435 static void port_timeout(unsigned long ref)
436 {
437 struct tipc_port *p_ptr = tipc_port_lock(ref);
438 struct sk_buff *buf = NULL;
439
440 if (!p_ptr)
441 return;
442
443 if (!p_ptr->connected) {
444 tipc_port_unlock(p_ptr);
445 return;
446 }
447
448 /* Last probe answered ? */
449 if (p_ptr->probing_state == PROBING) {
450 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
451 } else {
452 buf = port_build_proto_msg(port_peerport(p_ptr),
453 port_peernode(p_ptr),
454 p_ptr->ref,
455 tipc_own_addr,
456 CONN_MANAGER,
457 CONN_PROBE,
458 TIPC_OK,
459 0);
460 p_ptr->probing_state = PROBING;
461 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
462 }
463 tipc_port_unlock(p_ptr);
464 tipc_net_route_msg(buf);
465 }
466
467
468 static void port_handle_node_down(unsigned long ref)
469 {
470 struct tipc_port *p_ptr = tipc_port_lock(ref);
471 struct sk_buff *buf = NULL;
472
473 if (!p_ptr)
474 return;
475 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
476 tipc_port_unlock(p_ptr);
477 tipc_net_route_msg(buf);
478 }
479
480
481 static struct sk_buff *port_build_self_abort_msg(struct tipc_port *p_ptr, u32 err)
482 {
483 u32 imp = msg_importance(&p_ptr->phdr);
484
485 if (!p_ptr->connected)
486 return NULL;
487 if (imp < TIPC_CRITICAL_IMPORTANCE)
488 imp++;
489 return port_build_proto_msg(p_ptr->ref,
490 tipc_own_addr,
491 port_peerport(p_ptr),
492 port_peernode(p_ptr),
493 imp,
494 TIPC_CONN_MSG,
495 err,
496 0);
497 }
498
499
500 static struct sk_buff *port_build_peer_abort_msg(struct tipc_port *p_ptr, u32 err)
501 {
502 u32 imp = msg_importance(&p_ptr->phdr);
503
504 if (!p_ptr->connected)
505 return NULL;
506 if (imp < TIPC_CRITICAL_IMPORTANCE)
507 imp++;
508 return port_build_proto_msg(port_peerport(p_ptr),
509 port_peernode(p_ptr),
510 p_ptr->ref,
511 tipc_own_addr,
512 imp,
513 TIPC_CONN_MSG,
514 err,
515 0);
516 }
517
518 void tipc_port_recv_proto_msg(struct sk_buff *buf)
519 {
520 struct tipc_msg *msg = buf_msg(buf);
521 struct tipc_port *p_ptr = tipc_port_lock(msg_destport(msg));
522 u32 err = TIPC_OK;
523 struct sk_buff *r_buf = NULL;
524 struct sk_buff *abort_buf = NULL;
525
526 if (!p_ptr) {
527 err = TIPC_ERR_NO_PORT;
528 } else if (p_ptr->connected) {
529 if ((port_peernode(p_ptr) != msg_orignode(msg)) ||
530 (port_peerport(p_ptr) != msg_origport(msg))) {
531 err = TIPC_ERR_NO_PORT;
532 } else if (msg_type(msg) == CONN_ACK) {
533 int wakeup = tipc_port_congested(p_ptr) &&
534 p_ptr->congested &&
535 p_ptr->wakeup;
536 p_ptr->acked += msg_msgcnt(msg);
537 if (tipc_port_congested(p_ptr))
538 goto exit;
539 p_ptr->congested = 0;
540 if (!wakeup)
541 goto exit;
542 p_ptr->wakeup(p_ptr);
543 goto exit;
544 }
545 } else if (p_ptr->published) {
546 err = TIPC_ERR_NO_PORT;
547 }
548 if (err) {
549 r_buf = port_build_proto_msg(msg_origport(msg),
550 msg_orignode(msg),
551 msg_destport(msg),
552 tipc_own_addr,
553 TIPC_HIGH_IMPORTANCE,
554 TIPC_CONN_MSG,
555 err,
556 0);
557 goto exit;
558 }
559
560 /* All is fine */
561 if (msg_type(msg) == CONN_PROBE) {
562 r_buf = port_build_proto_msg(msg_origport(msg),
563 msg_orignode(msg),
564 msg_destport(msg),
565 tipc_own_addr,
566 CONN_MANAGER,
567 CONN_PROBE_REPLY,
568 TIPC_OK,
569 0);
570 }
571 p_ptr->probing_state = CONFIRMED;
572 exit:
573 if (p_ptr)
574 tipc_port_unlock(p_ptr);
575 tipc_net_route_msg(r_buf);
576 tipc_net_route_msg(abort_buf);
577 buf_discard(buf);
578 }
579
580 static void port_print(struct tipc_port *p_ptr, struct print_buf *buf, int full_id)
581 {
582 struct publication *publ;
583
584 if (full_id)
585 tipc_printf(buf, "<%u.%u.%u:%u>:",
586 tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
587 tipc_node(tipc_own_addr), p_ptr->ref);
588 else
589 tipc_printf(buf, "%-10u:", p_ptr->ref);
590
591 if (p_ptr->connected) {
592 u32 dport = port_peerport(p_ptr);
593 u32 destnode = port_peernode(p_ptr);
594
595 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
596 tipc_zone(destnode), tipc_cluster(destnode),
597 tipc_node(destnode), dport);
598 if (p_ptr->conn_type != 0)
599 tipc_printf(buf, " via {%u,%u}",
600 p_ptr->conn_type,
601 p_ptr->conn_instance);
602 } else if (p_ptr->published) {
603 tipc_printf(buf, " bound to");
604 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
605 if (publ->lower == publ->upper)
606 tipc_printf(buf, " {%u,%u}", publ->type,
607 publ->lower);
608 else
609 tipc_printf(buf, " {%u,%u,%u}", publ->type,
610 publ->lower, publ->upper);
611 }
612 }
613 tipc_printf(buf, "\n");
614 }
615
616 #define MAX_PORT_QUERY 32768
617
618 struct sk_buff *tipc_port_get_ports(void)
619 {
620 struct sk_buff *buf;
621 struct tlv_desc *rep_tlv;
622 struct print_buf pb;
623 struct tipc_port *p_ptr;
624 int str_len;
625
626 buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
627 if (!buf)
628 return NULL;
629 rep_tlv = (struct tlv_desc *)buf->data;
630
631 tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
632 spin_lock_bh(&tipc_port_list_lock);
633 list_for_each_entry(p_ptr, &ports, port_list) {
634 spin_lock_bh(p_ptr->lock);
635 port_print(p_ptr, &pb, 0);
636 spin_unlock_bh(p_ptr->lock);
637 }
638 spin_unlock_bh(&tipc_port_list_lock);
639 str_len = tipc_printbuf_validate(&pb);
640
641 skb_put(buf, TLV_SPACE(str_len));
642 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
643
644 return buf;
645 }
646
647 void tipc_port_reinit(void)
648 {
649 struct tipc_port *p_ptr;
650 struct tipc_msg *msg;
651
652 spin_lock_bh(&tipc_port_list_lock);
653 list_for_each_entry(p_ptr, &ports, port_list) {
654 msg = &p_ptr->phdr;
655 if (msg_orignode(msg) == tipc_own_addr)
656 break;
657 msg_set_prevnode(msg, tipc_own_addr);
658 msg_set_orignode(msg, tipc_own_addr);
659 }
660 spin_unlock_bh(&tipc_port_list_lock);
661 }
662
663
664 /*
665 * port_dispatcher_sigh(): Signal handler for messages destinated
666 * to the tipc_port interface.
667 */
668
669 static void port_dispatcher_sigh(void *dummy)
670 {
671 struct sk_buff *buf;
672
673 spin_lock_bh(&queue_lock);
674 buf = msg_queue_head;
675 msg_queue_head = NULL;
676 spin_unlock_bh(&queue_lock);
677
678 while (buf) {
679 struct tipc_port *p_ptr;
680 struct user_port *up_ptr;
681 struct tipc_portid orig;
682 struct tipc_name_seq dseq;
683 void *usr_handle;
684 int connected;
685 int published;
686 u32 message_type;
687
688 struct sk_buff *next = buf->next;
689 struct tipc_msg *msg = buf_msg(buf);
690 u32 dref = msg_destport(msg);
691
692 message_type = msg_type(msg);
693 if (message_type > TIPC_DIRECT_MSG)
694 goto reject; /* Unsupported message type */
695
696 p_ptr = tipc_port_lock(dref);
697 if (!p_ptr)
698 goto reject; /* Port deleted while msg in queue */
699
700 orig.ref = msg_origport(msg);
701 orig.node = msg_orignode(msg);
702 up_ptr = p_ptr->user_port;
703 usr_handle = up_ptr->usr_handle;
704 connected = p_ptr->connected;
705 published = p_ptr->published;
706
707 if (unlikely(msg_errcode(msg)))
708 goto err;
709
710 switch (message_type) {
711
712 case TIPC_CONN_MSG:{
713 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
714 u32 peer_port = port_peerport(p_ptr);
715 u32 peer_node = port_peernode(p_ptr);
716 u32 dsz;
717
718 tipc_port_unlock(p_ptr);
719 if (unlikely(!cb))
720 goto reject;
721 if (unlikely(!connected)) {
722 if (tipc_connect2port(dref, &orig))
723 goto reject;
724 } else if ((msg_origport(msg) != peer_port) ||
725 (msg_orignode(msg) != peer_node))
726 goto reject;
727 dsz = msg_data_sz(msg);
728 if (unlikely(dsz &&
729 (++p_ptr->conn_unacked >=
730 TIPC_FLOW_CONTROL_WIN)))
731 tipc_acknowledge(dref,
732 p_ptr->conn_unacked);
733 skb_pull(buf, msg_hdr_sz(msg));
734 cb(usr_handle, dref, &buf, msg_data(msg), dsz);
735 break;
736 }
737 case TIPC_DIRECT_MSG:{
738 tipc_msg_event cb = up_ptr->msg_cb;
739
740 tipc_port_unlock(p_ptr);
741 if (unlikely(!cb || connected))
742 goto reject;
743 skb_pull(buf, msg_hdr_sz(msg));
744 cb(usr_handle, dref, &buf, msg_data(msg),
745 msg_data_sz(msg), msg_importance(msg),
746 &orig);
747 break;
748 }
749 case TIPC_MCAST_MSG:
750 case TIPC_NAMED_MSG:{
751 tipc_named_msg_event cb = up_ptr->named_msg_cb;
752
753 tipc_port_unlock(p_ptr);
754 if (unlikely(!cb || connected || !published))
755 goto reject;
756 dseq.type = msg_nametype(msg);
757 dseq.lower = msg_nameinst(msg);
758 dseq.upper = (message_type == TIPC_NAMED_MSG)
759 ? dseq.lower : msg_nameupper(msg);
760 skb_pull(buf, msg_hdr_sz(msg));
761 cb(usr_handle, dref, &buf, msg_data(msg),
762 msg_data_sz(msg), msg_importance(msg),
763 &orig, &dseq);
764 break;
765 }
766 }
767 if (buf)
768 buf_discard(buf);
769 buf = next;
770 continue;
771 err:
772 switch (message_type) {
773
774 case TIPC_CONN_MSG:{
775 tipc_conn_shutdown_event cb =
776 up_ptr->conn_err_cb;
777 u32 peer_port = port_peerport(p_ptr);
778 u32 peer_node = port_peernode(p_ptr);
779
780 tipc_port_unlock(p_ptr);
781 if (!cb || !connected)
782 break;
783 if ((msg_origport(msg) != peer_port) ||
784 (msg_orignode(msg) != peer_node))
785 break;
786 tipc_disconnect(dref);
787 skb_pull(buf, msg_hdr_sz(msg));
788 cb(usr_handle, dref, &buf, msg_data(msg),
789 msg_data_sz(msg), msg_errcode(msg));
790 break;
791 }
792 case TIPC_DIRECT_MSG:{
793 tipc_msg_err_event cb = up_ptr->err_cb;
794
795 tipc_port_unlock(p_ptr);
796 if (!cb || connected)
797 break;
798 skb_pull(buf, msg_hdr_sz(msg));
799 cb(usr_handle, dref, &buf, msg_data(msg),
800 msg_data_sz(msg), msg_errcode(msg), &orig);
801 break;
802 }
803 case TIPC_MCAST_MSG:
804 case TIPC_NAMED_MSG:{
805 tipc_named_msg_err_event cb =
806 up_ptr->named_err_cb;
807
808 tipc_port_unlock(p_ptr);
809 if (!cb || connected)
810 break;
811 dseq.type = msg_nametype(msg);
812 dseq.lower = msg_nameinst(msg);
813 dseq.upper = (message_type == TIPC_NAMED_MSG)
814 ? dseq.lower : msg_nameupper(msg);
815 skb_pull(buf, msg_hdr_sz(msg));
816 cb(usr_handle, dref, &buf, msg_data(msg),
817 msg_data_sz(msg), msg_errcode(msg), &dseq);
818 break;
819 }
820 }
821 if (buf)
822 buf_discard(buf);
823 buf = next;
824 continue;
825 reject:
826 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
827 buf = next;
828 }
829 }
830
831 /*
832 * port_dispatcher(): Dispatcher for messages destinated
833 * to the tipc_port interface. Called with port locked.
834 */
835
836 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
837 {
838 buf->next = NULL;
839 spin_lock_bh(&queue_lock);
840 if (msg_queue_head) {
841 msg_queue_tail->next = buf;
842 msg_queue_tail = buf;
843 } else {
844 msg_queue_tail = msg_queue_head = buf;
845 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
846 }
847 spin_unlock_bh(&queue_lock);
848 return 0;
849 }
850
851 /*
852 * Wake up port after congestion: Called with port locked,
853 *
854 */
855
856 static void port_wakeup_sh(unsigned long ref)
857 {
858 struct tipc_port *p_ptr;
859 struct user_port *up_ptr;
860 tipc_continue_event cb = NULL;
861 void *uh = NULL;
862
863 p_ptr = tipc_port_lock(ref);
864 if (p_ptr) {
865 up_ptr = p_ptr->user_port;
866 if (up_ptr) {
867 cb = up_ptr->continue_event_cb;
868 uh = up_ptr->usr_handle;
869 }
870 tipc_port_unlock(p_ptr);
871 }
872 if (cb)
873 cb(uh, ref);
874 }
875
876
877 static void port_wakeup(struct tipc_port *p_ptr)
878 {
879 tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
880 }
881
882 void tipc_acknowledge(u32 ref, u32 ack)
883 {
884 struct tipc_port *p_ptr;
885 struct sk_buff *buf = NULL;
886
887 p_ptr = tipc_port_lock(ref);
888 if (!p_ptr)
889 return;
890 if (p_ptr->connected) {
891 p_ptr->conn_unacked -= ack;
892 buf = port_build_proto_msg(port_peerport(p_ptr),
893 port_peernode(p_ptr),
894 ref,
895 tipc_own_addr,
896 CONN_MANAGER,
897 CONN_ACK,
898 TIPC_OK,
899 ack);
900 }
901 tipc_port_unlock(p_ptr);
902 tipc_net_route_msg(buf);
903 }
904
905 /*
906 * tipc_createport(): user level call.
907 */
908
909 int tipc_createport(void *usr_handle,
910 unsigned int importance,
911 tipc_msg_err_event error_cb,
912 tipc_named_msg_err_event named_error_cb,
913 tipc_conn_shutdown_event conn_error_cb,
914 tipc_msg_event msg_cb,
915 tipc_named_msg_event named_msg_cb,
916 tipc_conn_msg_event conn_msg_cb,
917 tipc_continue_event continue_event_cb,/* May be zero */
918 u32 *portref)
919 {
920 struct user_port *up_ptr;
921 struct tipc_port *p_ptr;
922
923 up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
924 if (!up_ptr) {
925 warn("Port creation failed, no memory\n");
926 return -ENOMEM;
927 }
928 p_ptr = (struct tipc_port *)tipc_createport_raw(NULL, port_dispatcher,
929 port_wakeup, importance);
930 if (!p_ptr) {
931 kfree(up_ptr);
932 return -ENOMEM;
933 }
934
935 p_ptr->user_port = up_ptr;
936 up_ptr->usr_handle = usr_handle;
937 up_ptr->ref = p_ptr->ref;
938 up_ptr->err_cb = error_cb;
939 up_ptr->named_err_cb = named_error_cb;
940 up_ptr->conn_err_cb = conn_error_cb;
941 up_ptr->msg_cb = msg_cb;
942 up_ptr->named_msg_cb = named_msg_cb;
943 up_ptr->conn_msg_cb = conn_msg_cb;
944 up_ptr->continue_event_cb = continue_event_cb;
945 *portref = p_ptr->ref;
946 tipc_port_unlock(p_ptr);
947 return 0;
948 }
949
950 int tipc_portimportance(u32 ref, unsigned int *importance)
951 {
952 struct tipc_port *p_ptr;
953
954 p_ptr = tipc_port_lock(ref);
955 if (!p_ptr)
956 return -EINVAL;
957 *importance = (unsigned int)msg_importance(&p_ptr->phdr);
958 tipc_port_unlock(p_ptr);
959 return 0;
960 }
961
962 int tipc_set_portimportance(u32 ref, unsigned int imp)
963 {
964 struct tipc_port *p_ptr;
965
966 if (imp > TIPC_CRITICAL_IMPORTANCE)
967 return -EINVAL;
968
969 p_ptr = tipc_port_lock(ref);
970 if (!p_ptr)
971 return -EINVAL;
972 msg_set_importance(&p_ptr->phdr, (u32)imp);
973 tipc_port_unlock(p_ptr);
974 return 0;
975 }
976
977
978 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
979 {
980 struct tipc_port *p_ptr;
981 struct publication *publ;
982 u32 key;
983 int res = -EINVAL;
984
985 p_ptr = tipc_port_lock(ref);
986 if (!p_ptr)
987 return -EINVAL;
988
989 if (p_ptr->connected)
990 goto exit;
991 if (seq->lower > seq->upper)
992 goto exit;
993 if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
994 goto exit;
995 key = ref + p_ptr->pub_count + 1;
996 if (key == ref) {
997 res = -EADDRINUSE;
998 goto exit;
999 }
1000 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1001 scope, p_ptr->ref, key);
1002 if (publ) {
1003 list_add(&publ->pport_list, &p_ptr->publications);
1004 p_ptr->pub_count++;
1005 p_ptr->published = 1;
1006 res = 0;
1007 }
1008 exit:
1009 tipc_port_unlock(p_ptr);
1010 return res;
1011 }
1012
1013 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1014 {
1015 struct tipc_port *p_ptr;
1016 struct publication *publ;
1017 struct publication *tpubl;
1018 int res = -EINVAL;
1019
1020 p_ptr = tipc_port_lock(ref);
1021 if (!p_ptr)
1022 return -EINVAL;
1023 if (!seq) {
1024 list_for_each_entry_safe(publ, tpubl,
1025 &p_ptr->publications, pport_list) {
1026 tipc_nametbl_withdraw(publ->type, publ->lower,
1027 publ->ref, publ->key);
1028 }
1029 res = 0;
1030 } else {
1031 list_for_each_entry_safe(publ, tpubl,
1032 &p_ptr->publications, pport_list) {
1033 if (publ->scope != scope)
1034 continue;
1035 if (publ->type != seq->type)
1036 continue;
1037 if (publ->lower != seq->lower)
1038 continue;
1039 if (publ->upper != seq->upper)
1040 break;
1041 tipc_nametbl_withdraw(publ->type, publ->lower,
1042 publ->ref, publ->key);
1043 res = 0;
1044 break;
1045 }
1046 }
1047 if (list_empty(&p_ptr->publications))
1048 p_ptr->published = 0;
1049 tipc_port_unlock(p_ptr);
1050 return res;
1051 }
1052
1053 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1054 {
1055 struct tipc_port *p_ptr;
1056 struct tipc_msg *msg;
1057 int res = -EINVAL;
1058
1059 p_ptr = tipc_port_lock(ref);
1060 if (!p_ptr)
1061 return -EINVAL;
1062 if (p_ptr->published || p_ptr->connected)
1063 goto exit;
1064 if (!peer->ref)
1065 goto exit;
1066
1067 msg = &p_ptr->phdr;
1068 msg_set_destnode(msg, peer->node);
1069 msg_set_destport(msg, peer->ref);
1070 msg_set_orignode(msg, tipc_own_addr);
1071 msg_set_origport(msg, p_ptr->ref);
1072 msg_set_type(msg, TIPC_CONN_MSG);
1073 msg_set_lookup_scope(msg, 0);
1074 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1075
1076 p_ptr->probing_interval = PROBING_INTERVAL;
1077 p_ptr->probing_state = CONFIRMED;
1078 p_ptr->connected = 1;
1079 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1080
1081 tipc_nodesub_subscribe(&p_ptr->subscription, peer->node,
1082 (void *)(unsigned long)ref,
1083 (net_ev_handler)port_handle_node_down);
1084 res = 0;
1085 exit:
1086 tipc_port_unlock(p_ptr);
1087 p_ptr->max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1088 return res;
1089 }
1090
1091 /**
1092 * tipc_disconnect_port - disconnect port from peer
1093 *
1094 * Port must be locked.
1095 */
1096
1097 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1098 {
1099 int res;
1100
1101 if (tp_ptr->connected) {
1102 tp_ptr->connected = 0;
1103 /* let timer expire on it's own to avoid deadlock! */
1104 tipc_nodesub_unsubscribe(
1105 &((struct tipc_port *)tp_ptr)->subscription);
1106 res = 0;
1107 } else {
1108 res = -ENOTCONN;
1109 }
1110 return res;
1111 }
1112
1113 /*
1114 * tipc_disconnect(): Disconnect port form peer.
1115 * This is a node local operation.
1116 */
1117
1118 int tipc_disconnect(u32 ref)
1119 {
1120 struct tipc_port *p_ptr;
1121 int res;
1122
1123 p_ptr = tipc_port_lock(ref);
1124 if (!p_ptr)
1125 return -EINVAL;
1126 res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1127 tipc_port_unlock(p_ptr);
1128 return res;
1129 }
1130
1131 /*
1132 * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1133 */
1134 int tipc_shutdown(u32 ref)
1135 {
1136 struct tipc_port *p_ptr;
1137 struct sk_buff *buf = NULL;
1138
1139 p_ptr = tipc_port_lock(ref);
1140 if (!p_ptr)
1141 return -EINVAL;
1142
1143 if (p_ptr->connected) {
1144 u32 imp = msg_importance(&p_ptr->phdr);
1145 if (imp < TIPC_CRITICAL_IMPORTANCE)
1146 imp++;
1147 buf = port_build_proto_msg(port_peerport(p_ptr),
1148 port_peernode(p_ptr),
1149 ref,
1150 tipc_own_addr,
1151 imp,
1152 TIPC_CONN_MSG,
1153 TIPC_CONN_SHUTDOWN,
1154 0);
1155 }
1156 tipc_port_unlock(p_ptr);
1157 tipc_net_route_msg(buf);
1158 return tipc_disconnect(ref);
1159 }
1160
1161 /*
1162 * tipc_port_recv_sections(): Concatenate and deliver sectioned
1163 * message for this node.
1164 */
1165
1166 static int tipc_port_recv_sections(struct tipc_port *sender, unsigned int num_sect,
1167 struct iovec const *msg_sect,
1168 unsigned int total_len)
1169 {
1170 struct sk_buff *buf;
1171 int res;
1172
1173 res = tipc_msg_build(&sender->phdr, msg_sect, num_sect, total_len,
1174 MAX_MSG_SIZE, !sender->user_port, &buf);
1175 if (likely(buf))
1176 tipc_port_recv_msg(buf);
1177 return res;
1178 }
1179
1180 /**
1181 * tipc_send - send message sections on connection
1182 */
1183
1184 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect,
1185 unsigned int total_len)
1186 {
1187 struct tipc_port *p_ptr;
1188 u32 destnode;
1189 int res;
1190
1191 p_ptr = tipc_port_deref(ref);
1192 if (!p_ptr || !p_ptr->connected)
1193 return -EINVAL;
1194
1195 p_ptr->congested = 1;
1196 if (!tipc_port_congested(p_ptr)) {
1197 destnode = port_peernode(p_ptr);
1198 if (likely(destnode != tipc_own_addr))
1199 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1200 total_len, destnode);
1201 else
1202 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1203 total_len);
1204
1205 if (likely(res != -ELINKCONG)) {
1206 p_ptr->congested = 0;
1207 if (res > 0)
1208 p_ptr->sent++;
1209 return res;
1210 }
1211 }
1212 if (port_unreliable(p_ptr)) {
1213 p_ptr->congested = 0;
1214 return total_len;
1215 }
1216 return -ELINKCONG;
1217 }
1218
1219 /**
1220 * tipc_send2name - send message sections to port name
1221 */
1222
1223 int tipc_send2name(u32 ref, struct tipc_name const *name, unsigned int domain,
1224 unsigned int num_sect, struct iovec const *msg_sect,
1225 unsigned int total_len)
1226 {
1227 struct tipc_port *p_ptr;
1228 struct tipc_msg *msg;
1229 u32 destnode = domain;
1230 u32 destport;
1231 int res;
1232
1233 p_ptr = tipc_port_deref(ref);
1234 if (!p_ptr || p_ptr->connected)
1235 return -EINVAL;
1236
1237 msg = &p_ptr->phdr;
1238 msg_set_type(msg, TIPC_NAMED_MSG);
1239 msg_set_orignode(msg, tipc_own_addr);
1240 msg_set_origport(msg, ref);
1241 msg_set_hdr_sz(msg, LONG_H_SIZE);
1242 msg_set_nametype(msg, name->type);
1243 msg_set_nameinst(msg, name->instance);
1244 msg_set_lookup_scope(msg, tipc_addr_scope(domain));
1245 destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1246 msg_set_destnode(msg, destnode);
1247 msg_set_destport(msg, destport);
1248
1249 if (likely(destport)) {
1250 if (likely(destnode == tipc_own_addr))
1251 res = tipc_port_recv_sections(p_ptr, num_sect,
1252 msg_sect, total_len);
1253 else
1254 res = tipc_link_send_sections_fast(p_ptr, msg_sect,
1255 num_sect, total_len,
1256 destnode);
1257 if (likely(res != -ELINKCONG)) {
1258 if (res > 0)
1259 p_ptr->sent++;
1260 return res;
1261 }
1262 if (port_unreliable(p_ptr)) {
1263 return total_len;
1264 }
1265 return -ELINKCONG;
1266 }
1267 return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1268 total_len, TIPC_ERR_NO_NAME);
1269 }
1270
1271 /**
1272 * tipc_send2port - send message sections to port identity
1273 */
1274
1275 int tipc_send2port(u32 ref, struct tipc_portid const *dest,
1276 unsigned int num_sect, struct iovec const *msg_sect,
1277 unsigned int total_len)
1278 {
1279 struct tipc_port *p_ptr;
1280 struct tipc_msg *msg;
1281 int res;
1282
1283 p_ptr = tipc_port_deref(ref);
1284 if (!p_ptr || p_ptr->connected)
1285 return -EINVAL;
1286
1287 msg = &p_ptr->phdr;
1288 msg_set_type(msg, TIPC_DIRECT_MSG);
1289 msg_set_lookup_scope(msg, 0);
1290 msg_set_orignode(msg, tipc_own_addr);
1291 msg_set_origport(msg, ref);
1292 msg_set_destnode(msg, dest->node);
1293 msg_set_destport(msg, dest->ref);
1294 msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1295
1296 if (dest->node == tipc_own_addr)
1297 res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect,
1298 total_len);
1299 else
1300 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1301 total_len, dest->node);
1302 if (likely(res != -ELINKCONG)) {
1303 if (res > 0)
1304 p_ptr->sent++;
1305 return res;
1306 }
1307 if (port_unreliable(p_ptr)) {
1308 return total_len;
1309 }
1310 return -ELINKCONG;
1311 }
1312
1313 /**
1314 * tipc_send_buf2port - send message buffer to port identity
1315 */
1316
1317 int tipc_send_buf2port(u32 ref, struct tipc_portid const *dest,
1318 struct sk_buff *buf, unsigned int dsz)
1319 {
1320 struct tipc_port *p_ptr;
1321 struct tipc_msg *msg;
1322 int res;
1323
1324 p_ptr = (struct tipc_port *)tipc_ref_deref(ref);
1325 if (!p_ptr || p_ptr->connected)
1326 return -EINVAL;
1327
1328 msg = &p_ptr->phdr;
1329 msg_set_type(msg, TIPC_DIRECT_MSG);
1330 msg_set_orignode(msg, tipc_own_addr);
1331 msg_set_origport(msg, ref);
1332 msg_set_destnode(msg, dest->node);
1333 msg_set_destport(msg, dest->ref);
1334 msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1335 msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1336 if (skb_cow(buf, DIR_MSG_H_SIZE))
1337 return -ENOMEM;
1338
1339 skb_push(buf, DIR_MSG_H_SIZE);
1340 skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1341
1342 if (dest->node == tipc_own_addr)
1343 res = tipc_port_recv_msg(buf);
1344 else
1345 res = tipc_send_buf_fast(buf, dest->node);
1346 if (likely(res != -ELINKCONG)) {
1347 if (res > 0)
1348 p_ptr->sent++;
1349 return res;
1350 }
1351 if (port_unreliable(p_ptr))
1352 return dsz;
1353 return -ELINKCONG;
1354 }
1355
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree