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tipc: Fix bug in connection setup via native API
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1 /*
2  * net/tipc/port.c: TIPC port code
3  *
4  * Copyright (c) 1992-2007, Ericsson AB
5  * Copyright (c) 2004-2007, 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 "dbg.h"
40 #include "port.h"
41 #include "addr.h"
42 #include "link.h"
43 #include "node.h"
44 #include "name_table.h"
45 #include "user_reg.h"
46 #include "msg.h"
47 #include "bcast.h"
48
49 /* Connection management: */
50 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
51 #define CONFIRMED 0
52 #define PROBING 1
53
54 #define MAX_REJECT_SIZE 1024
55
56 static struct sk_buff *msg_queue_head = NULL;
57 static struct sk_buff *msg_queue_tail = NULL;
58
59 DEFINE_SPINLOCK(tipc_port_list_lock);
60 static DEFINE_SPINLOCK(queue_lock);
61
62 static LIST_HEAD(ports);
63 static void port_handle_node_down(unsigned long ref);
64 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
65 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
66 static void port_timeout(unsigned long ref);
67
68
69 static u32 port_peernode(struct port *p_ptr)
70 {
71         return msg_destnode(&p_ptr->publ.phdr);
72 }
73
74 static u32 port_peerport(struct port *p_ptr)
75 {
76         return msg_destport(&p_ptr->publ.phdr);
77 }
78
79 static u32 port_out_seqno(struct port *p_ptr)
80 {
81         return msg_transp_seqno(&p_ptr->publ.phdr);
82 }
83
84 static void port_incr_out_seqno(struct port *p_ptr)
85 {
86         struct tipc_msg *m = &p_ptr->publ.phdr;
87
88         if (likely(!msg_routed(m)))
89                 return;
90         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
91 }
92
93 /**
94  * tipc_multicast - send a multicast message to local and remote destinations
95  */
96
97 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
98                    u32 num_sect, struct iovec const *msg_sect)
99 {
100         struct tipc_msg *hdr;
101         struct sk_buff *buf;
102         struct sk_buff *ibuf = NULL;
103         struct port_list dports = {0, NULL, };
104         struct port *oport = tipc_port_deref(ref);
105         int ext_targets;
106         int res;
107
108         if (unlikely(!oport))
109                 return -EINVAL;
110
111         /* Create multicast message */
112
113         hdr = &oport->publ.phdr;
114         msg_set_type(hdr, TIPC_MCAST_MSG);
115         msg_set_nametype(hdr, seq->type);
116         msg_set_namelower(hdr, seq->lower);
117         msg_set_nameupper(hdr, seq->upper);
118         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
119         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
120                         !oport->user_port, &buf);
121         if (unlikely(!buf))
122                 return res;
123
124         /* Figure out where to send multicast message */
125
126         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
127                                                 TIPC_NODE_SCOPE, &dports);
128
129         /* Send message to destinations (duplicate it only if necessary) */
130
131         if (ext_targets) {
132                 if (dports.count != 0) {
133                         ibuf = skb_copy(buf, GFP_ATOMIC);
134                         if (ibuf == NULL) {
135                                 tipc_port_list_free(&dports);
136                                 buf_discard(buf);
137                                 return -ENOMEM;
138                         }
139                 }
140                 res = tipc_bclink_send_msg(buf);
141                 if ((res < 0) && (dports.count != 0)) {
142                         buf_discard(ibuf);
143                 }
144         } else {
145                 ibuf = buf;
146         }
147
148         if (res >= 0) {
149                 if (ibuf)
150                         tipc_port_recv_mcast(ibuf, &dports);
151         } else {
152                 tipc_port_list_free(&dports);
153         }
154         return res;
155 }
156
157 /**
158  * tipc_port_recv_mcast - deliver multicast message to all destination ports
159  *
160  * If there is no port list, perform a lookup to create one
161  */
162
163 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
164 {
165         struct tipc_msg* msg;
166         struct port_list dports = {0, NULL, };
167         struct port_list *item = dp;
168         int cnt = 0;
169
170         msg = buf_msg(buf);
171
172         /* Create destination port list, if one wasn't supplied */
173
174         if (dp == NULL) {
175                 tipc_nametbl_mc_translate(msg_nametype(msg),
176                                      msg_namelower(msg),
177                                      msg_nameupper(msg),
178                                      TIPC_CLUSTER_SCOPE,
179                                      &dports);
180                 item = dp = &dports;
181         }
182
183         /* Deliver a copy of message to each destination port */
184
185         if (dp->count != 0) {
186                 if (dp->count == 1) {
187                         msg_set_destport(msg, dp->ports[0]);
188                         tipc_port_recv_msg(buf);
189                         tipc_port_list_free(dp);
190                         return;
191                 }
192                 for (; cnt < dp->count; cnt++) {
193                         int index = cnt % PLSIZE;
194                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
195
196                         if (b == NULL) {
197                                 warn("Unable to deliver multicast message(s)\n");
198                                 msg_dbg(msg, "LOST:");
199                                 goto exit;
200                         }
201                         if ((index == 0) && (cnt != 0)) {
202                                 item = item->next;
203                         }
204                         msg_set_destport(buf_msg(b),item->ports[index]);
205                         tipc_port_recv_msg(b);
206                 }
207         }
208 exit:
209         buf_discard(buf);
210         tipc_port_list_free(dp);
211 }
212
213 /**
214  * tipc_createport_raw - create a generic TIPC port
215  *
216  * Returns port reference, or 0 if unable to create it
217  *
218  * Note: The newly created port is returned in the locked state.
219  */
220
221 u32 tipc_createport_raw(void *usr_handle,
222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
223                         void (*wakeup)(struct tipc_port *),
224                         const u32 importance,
225                         struct tipc_port **tp_ptr)
226 {
227         struct port *p_ptr;
228         struct tipc_msg *msg;
229         u32 ref;
230
231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
232         if (!p_ptr) {
233                 warn("Port creation failed, no memory\n");
234                 return 0;
235         }
236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
237         if (!ref) {
238                 warn("Port creation failed, reference table exhausted\n");
239                 kfree(p_ptr);
240                 return 0;
241         }
242
243         p_ptr->publ.usr_handle = usr_handle;
244         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
245         p_ptr->publ.ref = ref;
246         msg = &p_ptr->publ.phdr;
247         msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE,
248                  0);
249         msg_set_orignode(msg, tipc_own_addr);
250         msg_set_prevnode(msg, tipc_own_addr);
251         msg_set_origport(msg, ref);
252         msg_set_importance(msg,importance);
253         p_ptr->last_in_seqno = 41;
254         p_ptr->sent = 1;
255         INIT_LIST_HEAD(&p_ptr->wait_list);
256         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
257         p_ptr->congested_link = NULL;
258         p_ptr->dispatcher = dispatcher;
259         p_ptr->wakeup = wakeup;
260         p_ptr->user_port = NULL;
261         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
262         spin_lock_bh(&tipc_port_list_lock);
263         INIT_LIST_HEAD(&p_ptr->publications);
264         INIT_LIST_HEAD(&p_ptr->port_list);
265         list_add_tail(&p_ptr->port_list, &ports);
266         spin_unlock_bh(&tipc_port_list_lock);
267         *tp_ptr = &p_ptr->publ;
268         return ref;
269 }
270
271 int tipc_deleteport(u32 ref)
272 {
273         struct port *p_ptr;
274         struct sk_buff *buf = NULL;
275
276         tipc_withdraw(ref, 0, NULL);
277         p_ptr = tipc_port_lock(ref);
278         if (!p_ptr)
279                 return -EINVAL;
280
281         tipc_ref_discard(ref);
282         tipc_port_unlock(p_ptr);
283
284         k_cancel_timer(&p_ptr->timer);
285         if (p_ptr->publ.connected) {
286                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
287                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
288         }
289         if (p_ptr->user_port) {
290                 tipc_reg_remove_port(p_ptr->user_port);
291                 kfree(p_ptr->user_port);
292         }
293
294         spin_lock_bh(&tipc_port_list_lock);
295         list_del(&p_ptr->port_list);
296         list_del(&p_ptr->wait_list);
297         spin_unlock_bh(&tipc_port_list_lock);
298         k_term_timer(&p_ptr->timer);
299         kfree(p_ptr);
300         dbg("Deleted port %u\n", ref);
301         tipc_net_route_msg(buf);
302         return TIPC_OK;
303 }
304
305 /**
306  * tipc_get_port() - return port associated with 'ref'
307  *
308  * Note: Port is not locked.
309  */
310
311 struct tipc_port *tipc_get_port(const u32 ref)
312 {
313         return (struct tipc_port *)tipc_ref_deref(ref);
314 }
315
316 /**
317  * tipc_get_handle - return user handle associated to port 'ref'
318  */
319
320 void *tipc_get_handle(const u32 ref)
321 {
322         struct port *p_ptr;
323         void * handle;
324
325         p_ptr = tipc_port_lock(ref);
326         if (!p_ptr)
327                 return NULL;
328         handle = p_ptr->publ.usr_handle;
329         tipc_port_unlock(p_ptr);
330         return handle;
331 }
332
333 static int port_unreliable(struct port *p_ptr)
334 {
335         return msg_src_droppable(&p_ptr->publ.phdr);
336 }
337
338 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
339 {
340         struct port *p_ptr;
341
342         p_ptr = tipc_port_lock(ref);
343         if (!p_ptr)
344                 return -EINVAL;
345         *isunreliable = port_unreliable(p_ptr);
346         tipc_port_unlock(p_ptr);
347         return TIPC_OK;
348 }
349
350 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
351 {
352         struct port *p_ptr;
353
354         p_ptr = tipc_port_lock(ref);
355         if (!p_ptr)
356                 return -EINVAL;
357         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
358         tipc_port_unlock(p_ptr);
359         return TIPC_OK;
360 }
361
362 static int port_unreturnable(struct port *p_ptr)
363 {
364         return msg_dest_droppable(&p_ptr->publ.phdr);
365 }
366
367 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
368 {
369         struct port *p_ptr;
370
371         p_ptr = tipc_port_lock(ref);
372         if (!p_ptr)
373                 return -EINVAL;
374         *isunrejectable = port_unreturnable(p_ptr);
375         tipc_port_unlock(p_ptr);
376         return TIPC_OK;
377 }
378
379 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
380 {
381         struct port *p_ptr;
382
383         p_ptr = tipc_port_lock(ref);
384         if (!p_ptr)
385                 return -EINVAL;
386         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
387         tipc_port_unlock(p_ptr);
388         return TIPC_OK;
389 }
390
391 /*
392  * port_build_proto_msg(): build a port level protocol
393  * or a connection abortion message. Called with
394  * tipc_port lock on.
395  */
396 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
397                                             u32 origport, u32 orignode,
398                                             u32 usr, u32 type, u32 err,
399                                             u32 seqno, u32 ack)
400 {
401         struct sk_buff *buf;
402         struct tipc_msg *msg;
403
404         buf = buf_acquire(LONG_H_SIZE);
405         if (buf) {
406                 msg = buf_msg(buf);
407                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
408                 msg_set_destport(msg, destport);
409                 msg_set_origport(msg, origport);
410                 msg_set_destnode(msg, destnode);
411                 msg_set_orignode(msg, orignode);
412                 msg_set_transp_seqno(msg, seqno);
413                 msg_set_msgcnt(msg, ack);
414                 msg_dbg(msg, "PORT>SEND>:");
415         }
416         return buf;
417 }
418
419 int tipc_reject_msg(struct sk_buff *buf, u32 err)
420 {
421         struct tipc_msg *msg = buf_msg(buf);
422         struct sk_buff *rbuf;
423         struct tipc_msg *rmsg;
424         int hdr_sz;
425         u32 imp = msg_importance(msg);
426         u32 data_sz = msg_data_sz(msg);
427
428         if (data_sz > MAX_REJECT_SIZE)
429                 data_sz = MAX_REJECT_SIZE;
430         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
431                 imp++;
432         msg_dbg(msg, "port->rej: ");
433
434         /* discard rejected message if it shouldn't be returned to sender */
435         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
436                 buf_discard(buf);
437                 return data_sz;
438         }
439
440         /* construct rejected message */
441         if (msg_mcast(msg))
442                 hdr_sz = MCAST_H_SIZE;
443         else
444                 hdr_sz = LONG_H_SIZE;
445         rbuf = buf_acquire(data_sz + hdr_sz);
446         if (rbuf == NULL) {
447                 buf_discard(buf);
448                 return data_sz;
449         }
450         rmsg = buf_msg(rbuf);
451         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
452         msg_set_destport(rmsg, msg_origport(msg));
453         msg_set_prevnode(rmsg, tipc_own_addr);
454         msg_set_origport(rmsg, msg_destport(msg));
455         if (msg_short(msg))
456                 msg_set_orignode(rmsg, tipc_own_addr);
457         else
458                 msg_set_orignode(rmsg, msg_destnode(msg));
459         msg_set_size(rmsg, data_sz + hdr_sz);
460         msg_set_nametype(rmsg, msg_nametype(msg));
461         msg_set_nameinst(rmsg, msg_nameinst(msg));
462         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
463
464         /* send self-abort message when rejecting on a connected port */
465         if (msg_connected(msg)) {
466                 struct sk_buff *abuf = NULL;
467                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
468
469                 if (p_ptr) {
470                         if (p_ptr->publ.connected)
471                                 abuf = port_build_self_abort_msg(p_ptr, err);
472                         tipc_port_unlock(p_ptr);
473                 }
474                 tipc_net_route_msg(abuf);
475         }
476
477         /* send rejected message */
478         buf_discard(buf);
479         tipc_net_route_msg(rbuf);
480         return data_sz;
481 }
482
483 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
484                               struct iovec const *msg_sect, u32 num_sect,
485                               int err)
486 {
487         struct sk_buff *buf;
488         int res;
489
490         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
491                         !p_ptr->user_port, &buf);
492         if (!buf)
493                 return res;
494
495         return tipc_reject_msg(buf, err);
496 }
497
498 static void port_timeout(unsigned long ref)
499 {
500         struct port *p_ptr = tipc_port_lock(ref);
501         struct sk_buff *buf = NULL;
502
503         if (!p_ptr)
504                 return;
505
506         if (!p_ptr->publ.connected) {
507                 tipc_port_unlock(p_ptr);
508                 return;
509         }
510
511         /* Last probe answered ? */
512         if (p_ptr->probing_state == PROBING) {
513                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
514         } else {
515                 buf = port_build_proto_msg(port_peerport(p_ptr),
516                                            port_peernode(p_ptr),
517                                            p_ptr->publ.ref,
518                                            tipc_own_addr,
519                                            CONN_MANAGER,
520                                            CONN_PROBE,
521                                            TIPC_OK,
522                                            port_out_seqno(p_ptr),
523                                            0);
524                 port_incr_out_seqno(p_ptr);
525                 p_ptr->probing_state = PROBING;
526                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
527         }
528         tipc_port_unlock(p_ptr);
529         tipc_net_route_msg(buf);
530 }
531
532
533 static void port_handle_node_down(unsigned long ref)
534 {
535         struct port *p_ptr = tipc_port_lock(ref);
536         struct sk_buff* buf = NULL;
537
538         if (!p_ptr)
539                 return;
540         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
541         tipc_port_unlock(p_ptr);
542         tipc_net_route_msg(buf);
543 }
544
545
546 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
547 {
548         u32 imp = msg_importance(&p_ptr->publ.phdr);
549
550         if (!p_ptr->publ.connected)
551                 return NULL;
552         if (imp < TIPC_CRITICAL_IMPORTANCE)
553                 imp++;
554         return port_build_proto_msg(p_ptr->publ.ref,
555                                     tipc_own_addr,
556                                     port_peerport(p_ptr),
557                                     port_peernode(p_ptr),
558                                     imp,
559                                     TIPC_CONN_MSG,
560                                     err,
561                                     p_ptr->last_in_seqno + 1,
562                                     0);
563 }
564
565
566 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
567 {
568         u32 imp = msg_importance(&p_ptr->publ.phdr);
569
570         if (!p_ptr->publ.connected)
571                 return NULL;
572         if (imp < TIPC_CRITICAL_IMPORTANCE)
573                 imp++;
574         return port_build_proto_msg(port_peerport(p_ptr),
575                                     port_peernode(p_ptr),
576                                     p_ptr->publ.ref,
577                                     tipc_own_addr,
578                                     imp,
579                                     TIPC_CONN_MSG,
580                                     err,
581                                     port_out_seqno(p_ptr),
582                                     0);
583 }
584
585 void tipc_port_recv_proto_msg(struct sk_buff *buf)
586 {
587         struct tipc_msg *msg = buf_msg(buf);
588         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
589         u32 err = TIPC_OK;
590         struct sk_buff *r_buf = NULL;
591         struct sk_buff *abort_buf = NULL;
592
593         msg_dbg(msg, "PORT<RECV<:");
594
595         if (!p_ptr) {
596                 err = TIPC_ERR_NO_PORT;
597         } else if (p_ptr->publ.connected) {
598                 if (port_peernode(p_ptr) != msg_orignode(msg))
599                         err = TIPC_ERR_NO_PORT;
600                 if (port_peerport(p_ptr) != msg_origport(msg))
601                         err = TIPC_ERR_NO_PORT;
602                 if (!err && msg_routed(msg)) {
603                         u32 seqno = msg_transp_seqno(msg);
604                         u32 myno =  ++p_ptr->last_in_seqno;
605                         if (seqno != myno) {
606                                 err = TIPC_ERR_NO_PORT;
607                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
608                         }
609                 }
610                 if (msg_type(msg) == CONN_ACK) {
611                         int wakeup = tipc_port_congested(p_ptr) &&
612                                      p_ptr->publ.congested &&
613                                      p_ptr->wakeup;
614                         p_ptr->acked += msg_msgcnt(msg);
615                         if (tipc_port_congested(p_ptr))
616                                 goto exit;
617                         p_ptr->publ.congested = 0;
618                         if (!wakeup)
619                                 goto exit;
620                         p_ptr->wakeup(&p_ptr->publ);
621                         goto exit;
622                 }
623         } else if (p_ptr->publ.published) {
624                 err = TIPC_ERR_NO_PORT;
625         }
626         if (err) {
627                 r_buf = port_build_proto_msg(msg_origport(msg),
628                                              msg_orignode(msg),
629                                              msg_destport(msg),
630                                              tipc_own_addr,
631                                              TIPC_HIGH_IMPORTANCE,
632                                              TIPC_CONN_MSG,
633                                              err,
634                                              0,
635                                              0);
636                 goto exit;
637         }
638
639         /* All is fine */
640         if (msg_type(msg) == CONN_PROBE) {
641                 r_buf = port_build_proto_msg(msg_origport(msg),
642                                              msg_orignode(msg),
643                                              msg_destport(msg),
644                                              tipc_own_addr,
645                                              CONN_MANAGER,
646                                              CONN_PROBE_REPLY,
647                                              TIPC_OK,
648                                              port_out_seqno(p_ptr),
649                                              0);
650         }
651         p_ptr->probing_state = CONFIRMED;
652         port_incr_out_seqno(p_ptr);
653 exit:
654         if (p_ptr)
655                 tipc_port_unlock(p_ptr);
656         tipc_net_route_msg(r_buf);
657         tipc_net_route_msg(abort_buf);
658         buf_discard(buf);
659 }
660
661 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
662 {
663         struct publication *publ;
664
665         if (full_id)
666                 tipc_printf(buf, "<%u.%u.%u:%u>:",
667                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
668                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
669         else
670                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
671
672         if (p_ptr->publ.connected) {
673                 u32 dport = port_peerport(p_ptr);
674                 u32 destnode = port_peernode(p_ptr);
675
676                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
677                             tipc_zone(destnode), tipc_cluster(destnode),
678                             tipc_node(destnode), dport);
679                 if (p_ptr->publ.conn_type != 0)
680                         tipc_printf(buf, " via {%u,%u}",
681                                     p_ptr->publ.conn_type,
682                                     p_ptr->publ.conn_instance);
683         }
684         else if (p_ptr->publ.published) {
685                 tipc_printf(buf, " bound to");
686                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
687                         if (publ->lower == publ->upper)
688                                 tipc_printf(buf, " {%u,%u}", publ->type,
689                                             publ->lower);
690                         else
691                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
692                                             publ->lower, publ->upper);
693                 }
694         }
695         tipc_printf(buf, "\n");
696 }
697
698 #define MAX_PORT_QUERY 32768
699
700 struct sk_buff *tipc_port_get_ports(void)
701 {
702         struct sk_buff *buf;
703         struct tlv_desc *rep_tlv;
704         struct print_buf pb;
705         struct port *p_ptr;
706         int str_len;
707
708         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
709         if (!buf)
710                 return NULL;
711         rep_tlv = (struct tlv_desc *)buf->data;
712
713         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
714         spin_lock_bh(&tipc_port_list_lock);
715         list_for_each_entry(p_ptr, &ports, port_list) {
716                 spin_lock_bh(p_ptr->publ.lock);
717                 port_print(p_ptr, &pb, 0);
718                 spin_unlock_bh(p_ptr->publ.lock);
719         }
720         spin_unlock_bh(&tipc_port_list_lock);
721         str_len = tipc_printbuf_validate(&pb);
722
723         skb_put(buf, TLV_SPACE(str_len));
724         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
725
726         return buf;
727 }
728
729 #if 0
730
731 #define MAX_PORT_STATS 2000
732
733 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
734 {
735         u32 ref;
736         struct port *p_ptr;
737         struct sk_buff *buf;
738         struct tlv_desc *rep_tlv;
739         struct print_buf pb;
740         int str_len;
741
742         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
743                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
744
745         ref = *(u32 *)TLV_DATA(req_tlv_area);
746         ref = ntohl(ref);
747
748         p_ptr = tipc_port_lock(ref);
749         if (!p_ptr)
750                 return cfg_reply_error_string("port not found");
751
752         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
753         if (!buf) {
754                 tipc_port_unlock(p_ptr);
755                 return NULL;
756         }
757         rep_tlv = (struct tlv_desc *)buf->data;
758
759         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
760         port_print(p_ptr, &pb, 1);
761         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
762         tipc_port_unlock(p_ptr);
763         str_len = tipc_printbuf_validate(&pb);
764
765         skb_put(buf, TLV_SPACE(str_len));
766         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
767
768         return buf;
769 }
770
771 #endif
772
773 void tipc_port_reinit(void)
774 {
775         struct port *p_ptr;
776         struct tipc_msg *msg;
777
778         spin_lock_bh(&tipc_port_list_lock);
779         list_for_each_entry(p_ptr, &ports, port_list) {
780                 msg = &p_ptr->publ.phdr;
781                 if (msg_orignode(msg) == tipc_own_addr)
782                         break;
783                 msg_set_prevnode(msg, tipc_own_addr);
784                 msg_set_orignode(msg, tipc_own_addr);
785         }
786         spin_unlock_bh(&tipc_port_list_lock);
787 }
788
789
790 /*
791  *  port_dispatcher_sigh(): Signal handler for messages destinated
792  *                          to the tipc_port interface.
793  */
794
795 static void port_dispatcher_sigh(void *dummy)
796 {
797         struct sk_buff *buf;
798
799         spin_lock_bh(&queue_lock);
800         buf = msg_queue_head;
801         msg_queue_head = NULL;
802         spin_unlock_bh(&queue_lock);
803
804         while (buf) {
805                 struct port *p_ptr;
806                 struct user_port *up_ptr;
807                 struct tipc_portid orig;
808                 struct tipc_name_seq dseq;
809                 void *usr_handle;
810                 int connected;
811                 int published;
812                 u32 message_type;
813
814                 struct sk_buff *next = buf->next;
815                 struct tipc_msg *msg = buf_msg(buf);
816                 u32 dref = msg_destport(msg);
817
818                 message_type = msg_type(msg);
819                 if (message_type > TIPC_DIRECT_MSG)
820                         goto reject;    /* Unsupported message type */
821
822                 p_ptr = tipc_port_lock(dref);
823                 if (!p_ptr)
824                         goto reject;    /* Port deleted while msg in queue */
825
826                 orig.ref = msg_origport(msg);
827                 orig.node = msg_orignode(msg);
828                 up_ptr = p_ptr->user_port;
829                 usr_handle = up_ptr->usr_handle;
830                 connected = p_ptr->publ.connected;
831                 published = p_ptr->publ.published;
832
833                 if (unlikely(msg_errcode(msg)))
834                         goto err;
835
836                 switch (message_type) {
837
838                 case TIPC_CONN_MSG:{
839                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
840                                 u32 peer_port = port_peerport(p_ptr);
841                                 u32 peer_node = port_peernode(p_ptr);
842
843                                 tipc_port_unlock(p_ptr);
844                                 if (unlikely(!connected)) {
845                                         if (tipc_connect2port(dref, &orig))
846                                                 goto reject;
847                                 } else if ((msg_origport(msg) != peer_port) ||
848                                            (msg_orignode(msg) != peer_node))
849                                         goto reject;
850                                 if (unlikely(!cb))
851                                         goto reject;
852                                 if (unlikely(++p_ptr->publ.conn_unacked >=
853                                              TIPC_FLOW_CONTROL_WIN))
854                                         tipc_acknowledge(dref,
855                                                          p_ptr->publ.conn_unacked);
856                                 skb_pull(buf, msg_hdr_sz(msg));
857                                 cb(usr_handle, dref, &buf, msg_data(msg),
858                                    msg_data_sz(msg));
859                                 break;
860                         }
861                 case TIPC_DIRECT_MSG:{
862                                 tipc_msg_event cb = up_ptr->msg_cb;
863
864                                 tipc_port_unlock(p_ptr);
865                                 if (unlikely(connected))
866                                         goto reject;
867                                 if (unlikely(!cb))
868                                         goto reject;
869                                 skb_pull(buf, msg_hdr_sz(msg));
870                                 cb(usr_handle, dref, &buf, msg_data(msg),
871                                    msg_data_sz(msg), msg_importance(msg),
872                                    &orig);
873                                 break;
874                         }
875                 case TIPC_MCAST_MSG:
876                 case TIPC_NAMED_MSG:{
877                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
878
879                                 tipc_port_unlock(p_ptr);
880                                 if (unlikely(connected))
881                                         goto reject;
882                                 if (unlikely(!cb))
883                                         goto reject;
884                                 if (unlikely(!published))
885                                         goto reject;
886                                 dseq.type =  msg_nametype(msg);
887                                 dseq.lower = msg_nameinst(msg);
888                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
889                                         ? dseq.lower : msg_nameupper(msg);
890                                 skb_pull(buf, msg_hdr_sz(msg));
891                                 cb(usr_handle, dref, &buf, msg_data(msg),
892                                    msg_data_sz(msg), msg_importance(msg),
893                                    &orig, &dseq);
894                                 break;
895                         }
896                 }
897                 if (buf)
898                         buf_discard(buf);
899                 buf = next;
900                 continue;
901 err:
902                 switch (message_type) {
903
904                 case TIPC_CONN_MSG:{
905                                 tipc_conn_shutdown_event cb =
906                                         up_ptr->conn_err_cb;
907                                 u32 peer_port = port_peerport(p_ptr);
908                                 u32 peer_node = port_peernode(p_ptr);
909
910                                 tipc_port_unlock(p_ptr);
911                                 if (!connected || !cb)
912                                         break;
913                                 if (msg_origport(msg) != peer_port)
914                                         break;
915                                 if (msg_orignode(msg) != peer_node)
916                                         break;
917                                 tipc_disconnect(dref);
918                                 skb_pull(buf, msg_hdr_sz(msg));
919                                 cb(usr_handle, dref, &buf, msg_data(msg),
920                                    msg_data_sz(msg), msg_errcode(msg));
921                                 break;
922                         }
923                 case TIPC_DIRECT_MSG:{
924                                 tipc_msg_err_event cb = up_ptr->err_cb;
925
926                                 tipc_port_unlock(p_ptr);
927                                 if (connected || !cb)
928                                         break;
929                                 skb_pull(buf, msg_hdr_sz(msg));
930                                 cb(usr_handle, dref, &buf, msg_data(msg),
931                                    msg_data_sz(msg), msg_errcode(msg), &orig);
932                                 break;
933                         }
934                 case TIPC_MCAST_MSG:
935                 case TIPC_NAMED_MSG:{
936                                 tipc_named_msg_err_event cb =
937                                         up_ptr->named_err_cb;
938
939                                 tipc_port_unlock(p_ptr);
940                                 if (connected || !cb)
941                                         break;
942                                 dseq.type =  msg_nametype(msg);
943                                 dseq.lower = msg_nameinst(msg);
944                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
945                                         ? dseq.lower : msg_nameupper(msg);
946                                 skb_pull(buf, msg_hdr_sz(msg));
947                                 cb(usr_handle, dref, &buf, msg_data(msg),
948                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
949                                 break;
950                         }
951                 }
952                 if (buf)
953                         buf_discard(buf);
954                 buf = next;
955                 continue;
956 reject:
957                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
958                 buf = next;
959         }
960 }
961
962 /*
963  *  port_dispatcher(): Dispatcher for messages destinated
964  *  to the tipc_port interface. Called with port locked.
965  */
966
967 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
968 {
969         buf->next = NULL;
970         spin_lock_bh(&queue_lock);
971         if (msg_queue_head) {
972                 msg_queue_tail->next = buf;
973                 msg_queue_tail = buf;
974         } else {
975                 msg_queue_tail = msg_queue_head = buf;
976                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
977         }
978         spin_unlock_bh(&queue_lock);
979         return TIPC_OK;
980 }
981
982 /*
983  * Wake up port after congestion: Called with port locked,
984  *
985  */
986
987 static void port_wakeup_sh(unsigned long ref)
988 {
989         struct port *p_ptr;
990         struct user_port *up_ptr;
991         tipc_continue_event cb = NULL;
992         void *uh = NULL;
993
994         p_ptr = tipc_port_lock(ref);
995         if (p_ptr) {
996                 up_ptr = p_ptr->user_port;
997                 if (up_ptr) {
998                         cb = up_ptr->continue_event_cb;
999                         uh = up_ptr->usr_handle;
1000                 }
1001                 tipc_port_unlock(p_ptr);
1002         }
1003         if (cb)
1004                 cb(uh, ref);
1005 }
1006
1007
1008 static void port_wakeup(struct tipc_port *p_ptr)
1009 {
1010         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1011 }
1012
1013 void tipc_acknowledge(u32 ref, u32 ack)
1014 {
1015         struct port *p_ptr;
1016         struct sk_buff *buf = NULL;
1017
1018         p_ptr = tipc_port_lock(ref);
1019         if (!p_ptr)
1020                 return;
1021         if (p_ptr->publ.connected) {
1022                 p_ptr->publ.conn_unacked -= ack;
1023                 buf = port_build_proto_msg(port_peerport(p_ptr),
1024                                            port_peernode(p_ptr),
1025                                            ref,
1026                                            tipc_own_addr,
1027                                            CONN_MANAGER,
1028                                            CONN_ACK,
1029                                            TIPC_OK,
1030                                            port_out_seqno(p_ptr),
1031                                            ack);
1032         }
1033         tipc_port_unlock(p_ptr);
1034         tipc_net_route_msg(buf);
1035 }
1036
1037 /*
1038  * tipc_createport(): user level call. Will add port to
1039  *                    registry if non-zero user_ref.
1040  */
1041
1042 int tipc_createport(u32 user_ref,
1043                     void *usr_handle,
1044                     unsigned int importance,
1045                     tipc_msg_err_event error_cb,
1046                     tipc_named_msg_err_event named_error_cb,
1047                     tipc_conn_shutdown_event conn_error_cb,
1048                     tipc_msg_event msg_cb,
1049                     tipc_named_msg_event named_msg_cb,
1050                     tipc_conn_msg_event conn_msg_cb,
1051                     tipc_continue_event continue_event_cb,/* May be zero */
1052                     u32 *portref)
1053 {
1054         struct user_port *up_ptr;
1055         struct port *p_ptr;
1056         struct tipc_port *tp_ptr;
1057         u32 ref;
1058
1059         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1060         if (!up_ptr) {
1061                 warn("Port creation failed, no memory\n");
1062                 return -ENOMEM;
1063         }
1064         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1065                                   importance, &tp_ptr);
1066         if (ref == 0) {
1067                 kfree(up_ptr);
1068                 return -ENOMEM;
1069         }
1070         p_ptr = (struct port *)tp_ptr;
1071
1072         p_ptr->user_port = up_ptr;
1073         up_ptr->user_ref = user_ref;
1074         up_ptr->usr_handle = usr_handle;
1075         up_ptr->ref = p_ptr->publ.ref;
1076         up_ptr->err_cb = error_cb;
1077         up_ptr->named_err_cb = named_error_cb;
1078         up_ptr->conn_err_cb = conn_error_cb;
1079         up_ptr->msg_cb = msg_cb;
1080         up_ptr->named_msg_cb = named_msg_cb;
1081         up_ptr->conn_msg_cb = conn_msg_cb;
1082         up_ptr->continue_event_cb = continue_event_cb;
1083         INIT_LIST_HEAD(&up_ptr->uport_list);
1084         tipc_reg_add_port(up_ptr);
1085         *portref = p_ptr->publ.ref;
1086         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1087         tipc_port_unlock(p_ptr);
1088         return TIPC_OK;
1089 }
1090
1091 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1092 {
1093         id->ref = ref;
1094         id->node = tipc_own_addr;
1095         return TIPC_OK;
1096 }
1097
1098 int tipc_portimportance(u32 ref, unsigned int *importance)
1099 {
1100         struct port *p_ptr;
1101
1102         p_ptr = tipc_port_lock(ref);
1103         if (!p_ptr)
1104                 return -EINVAL;
1105         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1106         tipc_port_unlock(p_ptr);
1107         return TIPC_OK;
1108 }
1109
1110 int tipc_set_portimportance(u32 ref, unsigned int imp)
1111 {
1112         struct port *p_ptr;
1113
1114         if (imp > TIPC_CRITICAL_IMPORTANCE)
1115                 return -EINVAL;
1116
1117         p_ptr = tipc_port_lock(ref);
1118         if (!p_ptr)
1119                 return -EINVAL;
1120         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1121         tipc_port_unlock(p_ptr);
1122         return TIPC_OK;
1123 }
1124
1125
1126 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1127 {
1128         struct port *p_ptr;
1129         struct publication *publ;
1130         u32 key;
1131         int res = -EINVAL;
1132
1133         p_ptr = tipc_port_lock(ref);
1134         if (!p_ptr)
1135                 return -EINVAL;
1136
1137         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1138             "lower = %u, upper = %u\n",
1139             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1140         if (p_ptr->publ.connected)
1141                 goto exit;
1142         if (seq->lower > seq->upper)
1143                 goto exit;
1144         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1145                 goto exit;
1146         key = ref + p_ptr->pub_count + 1;
1147         if (key == ref) {
1148                 res = -EADDRINUSE;
1149                 goto exit;
1150         }
1151         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1152                                     scope, p_ptr->publ.ref, key);
1153         if (publ) {
1154                 list_add(&publ->pport_list, &p_ptr->publications);
1155                 p_ptr->pub_count++;
1156                 p_ptr->publ.published = 1;
1157                 res = TIPC_OK;
1158         }
1159 exit:
1160         tipc_port_unlock(p_ptr);
1161         return res;
1162 }
1163
1164 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1165 {
1166         struct port *p_ptr;
1167         struct publication *publ;
1168         struct publication *tpubl;
1169         int res = -EINVAL;
1170
1171         p_ptr = tipc_port_lock(ref);
1172         if (!p_ptr)
1173                 return -EINVAL;
1174         if (!seq) {
1175                 list_for_each_entry_safe(publ, tpubl,
1176                                          &p_ptr->publications, pport_list) {
1177                         tipc_nametbl_withdraw(publ->type, publ->lower,
1178                                               publ->ref, publ->key);
1179                 }
1180                 res = TIPC_OK;
1181         } else {
1182                 list_for_each_entry_safe(publ, tpubl,
1183                                          &p_ptr->publications, pport_list) {
1184                         if (publ->scope != scope)
1185                                 continue;
1186                         if (publ->type != seq->type)
1187                                 continue;
1188                         if (publ->lower != seq->lower)
1189                                 continue;
1190                         if (publ->upper != seq->upper)
1191                                 break;
1192                         tipc_nametbl_withdraw(publ->type, publ->lower,
1193                                               publ->ref, publ->key);
1194                         res = TIPC_OK;
1195                         break;
1196                 }
1197         }
1198         if (list_empty(&p_ptr->publications))
1199                 p_ptr->publ.published = 0;
1200         tipc_port_unlock(p_ptr);
1201         return res;
1202 }
1203
1204 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1205 {
1206         struct port *p_ptr;
1207         struct tipc_msg *msg;
1208         int res = -EINVAL;
1209
1210         p_ptr = tipc_port_lock(ref);
1211         if (!p_ptr)
1212                 return -EINVAL;
1213         if (p_ptr->publ.published || p_ptr->publ.connected)
1214                 goto exit;
1215         if (!peer->ref)
1216                 goto exit;
1217
1218         msg = &p_ptr->publ.phdr;
1219         msg_set_destnode(msg, peer->node);
1220         msg_set_destport(msg, peer->ref);
1221         msg_set_orignode(msg, tipc_own_addr);
1222         msg_set_origport(msg, p_ptr->publ.ref);
1223         msg_set_transp_seqno(msg, 42);
1224         msg_set_type(msg, TIPC_CONN_MSG);
1225         if (!may_route(peer->node))
1226                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1227         else
1228                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1229
1230         p_ptr->probing_interval = PROBING_INTERVAL;
1231         p_ptr->probing_state = CONFIRMED;
1232         p_ptr->publ.connected = 1;
1233         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1234
1235         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1236                           (void *)(unsigned long)ref,
1237                           (net_ev_handler)port_handle_node_down);
1238         res = TIPC_OK;
1239 exit:
1240         tipc_port_unlock(p_ptr);
1241         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1242         return res;
1243 }
1244
1245 /**
1246  * tipc_disconnect_port - disconnect port from peer
1247  *
1248  * Port must be locked.
1249  */
1250
1251 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1252 {
1253         int res;
1254
1255         if (tp_ptr->connected) {
1256                 tp_ptr->connected = 0;
1257                 /* let timer expire on it's own to avoid deadlock! */
1258                 tipc_nodesub_unsubscribe(
1259                         &((struct port *)tp_ptr)->subscription);
1260                 res = TIPC_OK;
1261         } else {
1262                 res = -ENOTCONN;
1263         }
1264         return res;
1265 }
1266
1267 /*
1268  * tipc_disconnect(): Disconnect port form peer.
1269  *                    This is a node local operation.
1270  */
1271
1272 int tipc_disconnect(u32 ref)
1273 {
1274         struct port *p_ptr;
1275         int res;
1276
1277         p_ptr = tipc_port_lock(ref);
1278         if (!p_ptr)
1279                 return -EINVAL;
1280         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1281         tipc_port_unlock(p_ptr);
1282         return res;
1283 }
1284
1285 /*
1286  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1287  */
1288 int tipc_shutdown(u32 ref)
1289 {
1290         struct port *p_ptr;
1291         struct sk_buff *buf = NULL;
1292
1293         p_ptr = tipc_port_lock(ref);
1294         if (!p_ptr)
1295                 return -EINVAL;
1296
1297         if (p_ptr->publ.connected) {
1298                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1299                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1300                         imp++;
1301                 buf = port_build_proto_msg(port_peerport(p_ptr),
1302                                            port_peernode(p_ptr),
1303                                            ref,
1304                                            tipc_own_addr,
1305                                            imp,
1306                                            TIPC_CONN_MSG,
1307                                            TIPC_CONN_SHUTDOWN,
1308                                            port_out_seqno(p_ptr),
1309                                            0);
1310         }
1311         tipc_port_unlock(p_ptr);
1312         tipc_net_route_msg(buf);
1313         return tipc_disconnect(ref);
1314 }
1315
1316 int tipc_isconnected(u32 ref, int *isconnected)
1317 {
1318         struct port *p_ptr;
1319
1320         p_ptr = tipc_port_lock(ref);
1321         if (!p_ptr)
1322                 return -EINVAL;
1323         *isconnected = p_ptr->publ.connected;
1324         tipc_port_unlock(p_ptr);
1325         return TIPC_OK;
1326 }
1327
1328 int tipc_peer(u32 ref, struct tipc_portid *peer)
1329 {
1330         struct port *p_ptr;
1331         int res;
1332
1333         p_ptr = tipc_port_lock(ref);
1334         if (!p_ptr)
1335                 return -EINVAL;
1336         if (p_ptr->publ.connected) {
1337                 peer->ref = port_peerport(p_ptr);
1338                 peer->node = port_peernode(p_ptr);
1339                 res = TIPC_OK;
1340         } else
1341                 res = -ENOTCONN;
1342         tipc_port_unlock(p_ptr);
1343         return res;
1344 }
1345
1346 int tipc_ref_valid(u32 ref)
1347 {
1348         /* Works irrespective of type */
1349         return !!tipc_ref_deref(ref);
1350 }
1351
1352
1353 /*
1354  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1355  *                        message for this node.
1356  */
1357
1358 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1359                        struct iovec const *msg_sect)
1360 {
1361         struct sk_buff *buf;
1362         int res;
1363
1364         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1365                         MAX_MSG_SIZE, !sender->user_port, &buf);
1366         if (likely(buf))
1367                 tipc_port_recv_msg(buf);
1368         return res;
1369 }
1370
1371 /**
1372  * tipc_send - send message sections on connection
1373  */
1374
1375 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1376 {
1377         struct port *p_ptr;
1378         u32 destnode;
1379         int res;
1380
1381         p_ptr = tipc_port_deref(ref);
1382         if (!p_ptr || !p_ptr->publ.connected)
1383                 return -EINVAL;
1384
1385         p_ptr->publ.congested = 1;
1386         if (!tipc_port_congested(p_ptr)) {
1387                 destnode = port_peernode(p_ptr);
1388                 if (likely(destnode != tipc_own_addr))
1389                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1390                                                            destnode);
1391                 else
1392                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1393
1394                 if (likely(res != -ELINKCONG)) {
1395                         port_incr_out_seqno(p_ptr);
1396                         p_ptr->publ.congested = 0;
1397                         p_ptr->sent++;
1398                         return res;
1399                 }
1400         }
1401         if (port_unreliable(p_ptr)) {
1402                 p_ptr->publ.congested = 0;
1403                 /* Just calculate msg length and return */
1404                 return msg_calc_data_size(msg_sect, num_sect);
1405         }
1406         return -ELINKCONG;
1407 }
1408
1409 /**
1410  * tipc_send_buf - send message buffer on connection
1411  */
1412
1413 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1414 {
1415         struct port *p_ptr;
1416         struct tipc_msg *msg;
1417         u32 destnode;
1418         u32 hsz;
1419         u32 sz;
1420         u32 res;
1421
1422         p_ptr = tipc_port_deref(ref);
1423         if (!p_ptr || !p_ptr->publ.connected)
1424                 return -EINVAL;
1425
1426         msg = &p_ptr->publ.phdr;
1427         hsz = msg_hdr_sz(msg);
1428         sz = hsz + dsz;
1429         msg_set_size(msg, sz);
1430         if (skb_cow(buf, hsz))
1431                 return -ENOMEM;
1432
1433         skb_push(buf, hsz);
1434         skb_copy_to_linear_data(buf, msg, hsz);
1435         destnode = msg_destnode(msg);
1436         p_ptr->publ.congested = 1;
1437         if (!tipc_port_congested(p_ptr)) {
1438                 if (likely(destnode != tipc_own_addr))
1439                         res = tipc_send_buf_fast(buf, destnode);
1440                 else {
1441                         tipc_port_recv_msg(buf);
1442                         res = sz;
1443                 }
1444                 if (likely(res != -ELINKCONG)) {
1445                         port_incr_out_seqno(p_ptr);
1446                         p_ptr->sent++;
1447                         p_ptr->publ.congested = 0;
1448                         return res;
1449                 }
1450         }
1451         if (port_unreliable(p_ptr)) {
1452                 p_ptr->publ.congested = 0;
1453                 return dsz;
1454         }
1455         return -ELINKCONG;
1456 }
1457
1458 /**
1459  * tipc_forward2name - forward message sections to port name
1460  */
1461
1462 int tipc_forward2name(u32 ref,
1463                       struct tipc_name const *name,
1464                       u32 domain,
1465                       u32 num_sect,
1466                       struct iovec const *msg_sect,
1467                       struct tipc_portid const *orig,
1468                       unsigned int importance)
1469 {
1470         struct port *p_ptr;
1471         struct tipc_msg *msg;
1472         u32 destnode = domain;
1473         u32 destport = 0;
1474         int res;
1475
1476         p_ptr = tipc_port_deref(ref);
1477         if (!p_ptr || p_ptr->publ.connected)
1478                 return -EINVAL;
1479
1480         msg = &p_ptr->publ.phdr;
1481         msg_set_type(msg, TIPC_NAMED_MSG);
1482         msg_set_orignode(msg, orig->node);
1483         msg_set_origport(msg, orig->ref);
1484         msg_set_hdr_sz(msg, LONG_H_SIZE);
1485         msg_set_nametype(msg, name->type);
1486         msg_set_nameinst(msg, name->instance);
1487         msg_set_lookup_scope(msg, addr_scope(domain));
1488         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1489                 msg_set_importance(msg,importance);
1490         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1491         msg_set_destnode(msg, destnode);
1492         msg_set_destport(msg, destport);
1493
1494         if (likely(destport || destnode)) {
1495                 p_ptr->sent++;
1496                 if (likely(destnode == tipc_own_addr))
1497                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1498                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1499                                                    destnode);
1500                 if (likely(res != -ELINKCONG))
1501                         return res;
1502                 if (port_unreliable(p_ptr)) {
1503                         /* Just calculate msg length and return */
1504                         return msg_calc_data_size(msg_sect, num_sect);
1505                 }
1506                 return -ELINKCONG;
1507         }
1508         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1509                                          TIPC_ERR_NO_NAME);
1510 }
1511
1512 /**
1513  * tipc_send2name - send message sections to port name
1514  */
1515
1516 int tipc_send2name(u32 ref,
1517                    struct tipc_name const *name,
1518                    unsigned int domain,
1519                    unsigned int num_sect,
1520                    struct iovec const *msg_sect)
1521 {
1522         struct tipc_portid orig;
1523
1524         orig.ref = ref;
1525         orig.node = tipc_own_addr;
1526         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1527                                  TIPC_PORT_IMPORTANCE);
1528 }
1529
1530 /**
1531  * tipc_forward_buf2name - forward message buffer to port name
1532  */
1533
1534 int tipc_forward_buf2name(u32 ref,
1535                           struct tipc_name const *name,
1536                           u32 domain,
1537                           struct sk_buff *buf,
1538                           unsigned int dsz,
1539                           struct tipc_portid const *orig,
1540                           unsigned int importance)
1541 {
1542         struct port *p_ptr;
1543         struct tipc_msg *msg;
1544         u32 destnode = domain;
1545         u32 destport = 0;
1546         int res;
1547
1548         p_ptr = (struct port *)tipc_ref_deref(ref);
1549         if (!p_ptr || p_ptr->publ.connected)
1550                 return -EINVAL;
1551
1552         msg = &p_ptr->publ.phdr;
1553         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1554                 msg_set_importance(msg, importance);
1555         msg_set_type(msg, TIPC_NAMED_MSG);
1556         msg_set_orignode(msg, orig->node);
1557         msg_set_origport(msg, orig->ref);
1558         msg_set_nametype(msg, name->type);
1559         msg_set_nameinst(msg, name->instance);
1560         msg_set_lookup_scope(msg, addr_scope(domain));
1561         msg_set_hdr_sz(msg, LONG_H_SIZE);
1562         msg_set_size(msg, LONG_H_SIZE + dsz);
1563         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1564         msg_set_destnode(msg, destnode);
1565         msg_set_destport(msg, destport);
1566         msg_dbg(msg, "forw2name ==> ");
1567         if (skb_cow(buf, LONG_H_SIZE))
1568                 return -ENOMEM;
1569         skb_push(buf, LONG_H_SIZE);
1570         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1571         msg_dbg(buf_msg(buf),"PREP:");
1572         if (likely(destport || destnode)) {
1573                 p_ptr->sent++;
1574                 if (destnode == tipc_own_addr)
1575                         return tipc_port_recv_msg(buf);
1576                 res = tipc_send_buf_fast(buf, destnode);
1577                 if (likely(res != -ELINKCONG))
1578                         return res;
1579                 if (port_unreliable(p_ptr))
1580                         return dsz;
1581                 return -ELINKCONG;
1582         }
1583         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1584 }
1585
1586 /**
1587  * tipc_send_buf2name - send message buffer to port name
1588  */
1589
1590 int tipc_send_buf2name(u32 ref,
1591                        struct tipc_name const *dest,
1592                        u32 domain,
1593                        struct sk_buff *buf,
1594                        unsigned int dsz)
1595 {
1596         struct tipc_portid orig;
1597
1598         orig.ref = ref;
1599         orig.node = tipc_own_addr;
1600         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1601                                      TIPC_PORT_IMPORTANCE);
1602 }
1603
1604 /**
1605  * tipc_forward2port - forward message sections to port identity
1606  */
1607
1608 int tipc_forward2port(u32 ref,
1609                       struct tipc_portid const *dest,
1610                       unsigned int num_sect,
1611                       struct iovec const *msg_sect,
1612                       struct tipc_portid const *orig,
1613                       unsigned int importance)
1614 {
1615         struct port *p_ptr;
1616         struct tipc_msg *msg;
1617         int res;
1618
1619         p_ptr = tipc_port_deref(ref);
1620         if (!p_ptr || p_ptr->publ.connected)
1621                 return -EINVAL;
1622
1623         msg = &p_ptr->publ.phdr;
1624         msg_set_type(msg, TIPC_DIRECT_MSG);
1625         msg_set_orignode(msg, orig->node);
1626         msg_set_origport(msg, orig->ref);
1627         msg_set_destnode(msg, dest->node);
1628         msg_set_destport(msg, dest->ref);
1629         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1630         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1631                 msg_set_importance(msg, importance);
1632         p_ptr->sent++;
1633         if (dest->node == tipc_own_addr)
1634                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1635         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1636         if (likely(res != -ELINKCONG))
1637                 return res;
1638         if (port_unreliable(p_ptr)) {
1639                 /* Just calculate msg length and return */
1640                 return msg_calc_data_size(msg_sect, num_sect);
1641         }
1642         return -ELINKCONG;
1643 }
1644
1645 /**
1646  * tipc_send2port - send message sections to port identity
1647  */
1648
1649 int tipc_send2port(u32 ref,
1650                    struct tipc_portid const *dest,
1651                    unsigned int num_sect,
1652                    struct iovec const *msg_sect)
1653 {
1654         struct tipc_portid orig;
1655
1656         orig.ref = ref;
1657         orig.node = tipc_own_addr;
1658         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1659                                  TIPC_PORT_IMPORTANCE);
1660 }
1661
1662 /**
1663  * tipc_forward_buf2port - forward message buffer to port identity
1664  */
1665 int tipc_forward_buf2port(u32 ref,
1666                           struct tipc_portid const *dest,
1667                           struct sk_buff *buf,
1668                           unsigned int dsz,
1669                           struct tipc_portid const *orig,
1670                           unsigned int importance)
1671 {
1672         struct port *p_ptr;
1673         struct tipc_msg *msg;
1674         int res;
1675
1676         p_ptr = (struct port *)tipc_ref_deref(ref);
1677         if (!p_ptr || p_ptr->publ.connected)
1678                 return -EINVAL;
1679
1680         msg = &p_ptr->publ.phdr;
1681         msg_set_type(msg, TIPC_DIRECT_MSG);
1682         msg_set_orignode(msg, orig->node);
1683         msg_set_origport(msg, orig->ref);
1684         msg_set_destnode(msg, dest->node);
1685         msg_set_destport(msg, dest->ref);
1686         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1687         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1688                 msg_set_importance(msg, importance);
1689         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1690         if (skb_cow(buf, DIR_MSG_H_SIZE))
1691                 return -ENOMEM;
1692
1693         skb_push(buf, DIR_MSG_H_SIZE);
1694         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1695         msg_dbg(msg, "buf2port: ");
1696         p_ptr->sent++;
1697         if (dest->node == tipc_own_addr)
1698                 return tipc_port_recv_msg(buf);
1699         res = tipc_send_buf_fast(buf, dest->node);
1700         if (likely(res != -ELINKCONG))
1701                 return res;
1702         if (port_unreliable(p_ptr))
1703                 return dsz;
1704         return -ELINKCONG;
1705 }
1706
1707 /**
1708  * tipc_send_buf2port - send message buffer to port identity
1709  */
1710
1711 int tipc_send_buf2port(u32 ref,
1712                        struct tipc_portid const *dest,
1713                        struct sk_buff *buf,
1714                        unsigned int dsz)
1715 {
1716         struct tipc_portid orig;
1717
1718         orig.ref = ref;
1719         orig.node = tipc_own_addr;
1720         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1721                                      TIPC_PORT_IMPORTANCE);
1722 }
1723