[TIPC]: Eliminate "sparse" symbol warnings
[linux-2.6.git] / net / tipc / port.c
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 native TIPC port
215  *
216  * Returns local port reference
217  */
218
219 u32 tipc_createport_raw(void *usr_handle,
220                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
221                         void (*wakeup)(struct tipc_port *),
222                         const u32 importance)
223 {
224         struct port *p_ptr;
225         struct tipc_msg *msg;
226         u32 ref;
227
228         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
229         if (!p_ptr) {
230                 warn("Port creation failed, no memory\n");
231                 return 0;
232         }
233         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
234         if (!ref) {
235                 warn("Port creation failed, reference table exhausted\n");
236                 kfree(p_ptr);
237                 return 0;
238         }
239
240         tipc_port_lock(ref);
241         p_ptr->publ.usr_handle = usr_handle;
242         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
243         p_ptr->publ.ref = ref;
244         msg = &p_ptr->publ.phdr;
245         msg_init(msg, DATA_LOW, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE, 0);
246         msg_set_orignode(msg, tipc_own_addr);
247         msg_set_prevnode(msg, tipc_own_addr);
248         msg_set_origport(msg, ref);
249         msg_set_importance(msg,importance);
250         p_ptr->last_in_seqno = 41;
251         p_ptr->sent = 1;
252         INIT_LIST_HEAD(&p_ptr->wait_list);
253         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
254         p_ptr->congested_link = NULL;
255         p_ptr->dispatcher = dispatcher;
256         p_ptr->wakeup = wakeup;
257         p_ptr->user_port = NULL;
258         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
259         spin_lock_bh(&tipc_port_list_lock);
260         INIT_LIST_HEAD(&p_ptr->publications);
261         INIT_LIST_HEAD(&p_ptr->port_list);
262         list_add_tail(&p_ptr->port_list, &ports);
263         spin_unlock_bh(&tipc_port_list_lock);
264         tipc_port_unlock(p_ptr);
265         return ref;
266 }
267
268 int tipc_deleteport(u32 ref)
269 {
270         struct port *p_ptr;
271         struct sk_buff *buf = NULL;
272
273         tipc_withdraw(ref, 0, NULL);
274         p_ptr = tipc_port_lock(ref);
275         if (!p_ptr)
276                 return -EINVAL;
277
278         tipc_ref_discard(ref);
279         tipc_port_unlock(p_ptr);
280
281         k_cancel_timer(&p_ptr->timer);
282         if (p_ptr->publ.connected) {
283                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
284                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
285         }
286         if (p_ptr->user_port) {
287                 tipc_reg_remove_port(p_ptr->user_port);
288                 kfree(p_ptr->user_port);
289         }
290
291         spin_lock_bh(&tipc_port_list_lock);
292         list_del(&p_ptr->port_list);
293         list_del(&p_ptr->wait_list);
294         spin_unlock_bh(&tipc_port_list_lock);
295         k_term_timer(&p_ptr->timer);
296         kfree(p_ptr);
297         dbg("Deleted port %u\n", ref);
298         tipc_net_route_msg(buf);
299         return TIPC_OK;
300 }
301
302 /**
303  * tipc_get_port() - return port associated with 'ref'
304  *
305  * Note: Port is not locked.
306  */
307
308 struct tipc_port *tipc_get_port(const u32 ref)
309 {
310         return (struct tipc_port *)tipc_ref_deref(ref);
311 }
312
313 /**
314  * tipc_get_handle - return user handle associated to port 'ref'
315  */
316
317 void *tipc_get_handle(const u32 ref)
318 {
319         struct port *p_ptr;
320         void * handle;
321
322         p_ptr = tipc_port_lock(ref);
323         if (!p_ptr)
324                 return NULL;
325         handle = p_ptr->publ.usr_handle;
326         tipc_port_unlock(p_ptr);
327         return handle;
328 }
329
330 static int port_unreliable(struct port *p_ptr)
331 {
332         return msg_src_droppable(&p_ptr->publ.phdr);
333 }
334
335 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
336 {
337         struct port *p_ptr;
338
339         p_ptr = tipc_port_lock(ref);
340         if (!p_ptr)
341                 return -EINVAL;
342         *isunreliable = port_unreliable(p_ptr);
343         tipc_port_unlock(p_ptr);
344         return TIPC_OK;
345 }
346
347 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
348 {
349         struct port *p_ptr;
350
351         p_ptr = tipc_port_lock(ref);
352         if (!p_ptr)
353                 return -EINVAL;
354         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
355         tipc_port_unlock(p_ptr);
356         return TIPC_OK;
357 }
358
359 static int port_unreturnable(struct port *p_ptr)
360 {
361         return msg_dest_droppable(&p_ptr->publ.phdr);
362 }
363
364 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
365 {
366         struct port *p_ptr;
367
368         p_ptr = tipc_port_lock(ref);
369         if (!p_ptr)
370                 return -EINVAL;
371         *isunrejectable = port_unreturnable(p_ptr);
372         tipc_port_unlock(p_ptr);
373         return TIPC_OK;
374 }
375
376 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
377 {
378         struct port *p_ptr;
379
380         p_ptr = tipc_port_lock(ref);
381         if (!p_ptr)
382                 return -EINVAL;
383         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
384         tipc_port_unlock(p_ptr);
385         return TIPC_OK;
386 }
387
388 /*
389  * port_build_proto_msg(): build a port level protocol
390  * or a connection abortion message. Called with
391  * tipc_port lock on.
392  */
393 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
394                                             u32 origport, u32 orignode,
395                                             u32 usr, u32 type, u32 err,
396                                             u32 seqno, u32 ack)
397 {
398         struct sk_buff *buf;
399         struct tipc_msg *msg;
400
401         buf = buf_acquire(LONG_H_SIZE);
402         if (buf) {
403                 msg = buf_msg(buf);
404                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
405                 msg_set_destport(msg, destport);
406                 msg_set_origport(msg, origport);
407                 msg_set_destnode(msg, destnode);
408                 msg_set_orignode(msg, orignode);
409                 msg_set_transp_seqno(msg, seqno);
410                 msg_set_msgcnt(msg, ack);
411                 msg_dbg(msg, "PORT>SEND>:");
412         }
413         return buf;
414 }
415
416 int tipc_reject_msg(struct sk_buff *buf, u32 err)
417 {
418         struct tipc_msg *msg = buf_msg(buf);
419         struct sk_buff *rbuf;
420         struct tipc_msg *rmsg;
421         int hdr_sz;
422         u32 imp = msg_importance(msg);
423         u32 data_sz = msg_data_sz(msg);
424
425         if (data_sz > MAX_REJECT_SIZE)
426                 data_sz = MAX_REJECT_SIZE;
427         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
428                 imp++;
429         msg_dbg(msg, "port->rej: ");
430
431         /* discard rejected message if it shouldn't be returned to sender */
432         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
433                 buf_discard(buf);
434                 return data_sz;
435         }
436
437         /* construct rejected message */
438         if (msg_mcast(msg))
439                 hdr_sz = MCAST_H_SIZE;
440         else
441                 hdr_sz = LONG_H_SIZE;
442         rbuf = buf_acquire(data_sz + hdr_sz);
443         if (rbuf == NULL) {
444                 buf_discard(buf);
445                 return data_sz;
446         }
447         rmsg = buf_msg(rbuf);
448         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
449         msg_set_destport(rmsg, msg_origport(msg));
450         msg_set_prevnode(rmsg, tipc_own_addr);
451         msg_set_origport(rmsg, msg_destport(msg));
452         if (msg_short(msg))
453                 msg_set_orignode(rmsg, tipc_own_addr);
454         else
455                 msg_set_orignode(rmsg, msg_destnode(msg));
456         msg_set_size(rmsg, data_sz + hdr_sz);
457         msg_set_nametype(rmsg, msg_nametype(msg));
458         msg_set_nameinst(rmsg, msg_nameinst(msg));
459         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
460
461         /* send self-abort message when rejecting on a connected port */
462         if (msg_connected(msg)) {
463                 struct sk_buff *abuf = NULL;
464                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
465
466                 if (p_ptr) {
467                         if (p_ptr->publ.connected)
468                                 abuf = port_build_self_abort_msg(p_ptr, err);
469                         tipc_port_unlock(p_ptr);
470                 }
471                 tipc_net_route_msg(abuf);
472         }
473
474         /* send rejected message */
475         buf_discard(buf);
476         tipc_net_route_msg(rbuf);
477         return data_sz;
478 }
479
480 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
481                               struct iovec const *msg_sect, u32 num_sect,
482                               int err)
483 {
484         struct sk_buff *buf;
485         int res;
486
487         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
488                         !p_ptr->user_port, &buf);
489         if (!buf)
490                 return res;
491
492         return tipc_reject_msg(buf, err);
493 }
494
495 static void port_timeout(unsigned long ref)
496 {
497         struct port *p_ptr = tipc_port_lock(ref);
498         struct sk_buff *buf = NULL;
499
500         if (!p_ptr)
501                 return;
502
503         if (!p_ptr->publ.connected) {
504                 tipc_port_unlock(p_ptr);
505                 return;
506         }
507
508         /* Last probe answered ? */
509         if (p_ptr->probing_state == PROBING) {
510                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
511         } else {
512                 buf = port_build_proto_msg(port_peerport(p_ptr),
513                                            port_peernode(p_ptr),
514                                            p_ptr->publ.ref,
515                                            tipc_own_addr,
516                                            CONN_MANAGER,
517                                            CONN_PROBE,
518                                            TIPC_OK,
519                                            port_out_seqno(p_ptr),
520                                            0);
521                 port_incr_out_seqno(p_ptr);
522                 p_ptr->probing_state = PROBING;
523                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
524         }
525         tipc_port_unlock(p_ptr);
526         tipc_net_route_msg(buf);
527 }
528
529
530 static void port_handle_node_down(unsigned long ref)
531 {
532         struct port *p_ptr = tipc_port_lock(ref);
533         struct sk_buff* buf = NULL;
534
535         if (!p_ptr)
536                 return;
537         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
538         tipc_port_unlock(p_ptr);
539         tipc_net_route_msg(buf);
540 }
541
542
543 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
544 {
545         u32 imp = msg_importance(&p_ptr->publ.phdr);
546
547         if (!p_ptr->publ.connected)
548                 return NULL;
549         if (imp < TIPC_CRITICAL_IMPORTANCE)
550                 imp++;
551         return port_build_proto_msg(p_ptr->publ.ref,
552                                     tipc_own_addr,
553                                     port_peerport(p_ptr),
554                                     port_peernode(p_ptr),
555                                     imp,
556                                     TIPC_CONN_MSG,
557                                     err,
558                                     p_ptr->last_in_seqno + 1,
559                                     0);
560 }
561
562
563 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
564 {
565         u32 imp = msg_importance(&p_ptr->publ.phdr);
566
567         if (!p_ptr->publ.connected)
568                 return NULL;
569         if (imp < TIPC_CRITICAL_IMPORTANCE)
570                 imp++;
571         return port_build_proto_msg(port_peerport(p_ptr),
572                                     port_peernode(p_ptr),
573                                     p_ptr->publ.ref,
574                                     tipc_own_addr,
575                                     imp,
576                                     TIPC_CONN_MSG,
577                                     err,
578                                     port_out_seqno(p_ptr),
579                                     0);
580 }
581
582 void tipc_port_recv_proto_msg(struct sk_buff *buf)
583 {
584         struct tipc_msg *msg = buf_msg(buf);
585         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
586         u32 err = TIPC_OK;
587         struct sk_buff *r_buf = NULL;
588         struct sk_buff *abort_buf = NULL;
589
590         msg_dbg(msg, "PORT<RECV<:");
591
592         if (!p_ptr) {
593                 err = TIPC_ERR_NO_PORT;
594         } else if (p_ptr->publ.connected) {
595                 if (port_peernode(p_ptr) != msg_orignode(msg))
596                         err = TIPC_ERR_NO_PORT;
597                 if (port_peerport(p_ptr) != msg_origport(msg))
598                         err = TIPC_ERR_NO_PORT;
599                 if (!err && msg_routed(msg)) {
600                         u32 seqno = msg_transp_seqno(msg);
601                         u32 myno =  ++p_ptr->last_in_seqno;
602                         if (seqno != myno) {
603                                 err = TIPC_ERR_NO_PORT;
604                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
605                         }
606                 }
607                 if (msg_type(msg) == CONN_ACK) {
608                         int wakeup = tipc_port_congested(p_ptr) &&
609                                      p_ptr->publ.congested &&
610                                      p_ptr->wakeup;
611                         p_ptr->acked += msg_msgcnt(msg);
612                         if (tipc_port_congested(p_ptr))
613                                 goto exit;
614                         p_ptr->publ.congested = 0;
615                         if (!wakeup)
616                                 goto exit;
617                         p_ptr->wakeup(&p_ptr->publ);
618                         goto exit;
619                 }
620         } else if (p_ptr->publ.published) {
621                 err = TIPC_ERR_NO_PORT;
622         }
623         if (err) {
624                 r_buf = port_build_proto_msg(msg_origport(msg),
625                                              msg_orignode(msg),
626                                              msg_destport(msg),
627                                              tipc_own_addr,
628                                              DATA_HIGH,
629                                              TIPC_CONN_MSG,
630                                              err,
631                                              0,
632                                              0);
633                 goto exit;
634         }
635
636         /* All is fine */
637         if (msg_type(msg) == CONN_PROBE) {
638                 r_buf = port_build_proto_msg(msg_origport(msg),
639                                              msg_orignode(msg),
640                                              msg_destport(msg),
641                                              tipc_own_addr,
642                                              CONN_MANAGER,
643                                              CONN_PROBE_REPLY,
644                                              TIPC_OK,
645                                              port_out_seqno(p_ptr),
646                                              0);
647         }
648         p_ptr->probing_state = CONFIRMED;
649         port_incr_out_seqno(p_ptr);
650 exit:
651         if (p_ptr)
652                 tipc_port_unlock(p_ptr);
653         tipc_net_route_msg(r_buf);
654         tipc_net_route_msg(abort_buf);
655         buf_discard(buf);
656 }
657
658 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
659 {
660         struct publication *publ;
661
662         if (full_id)
663                 tipc_printf(buf, "<%u.%u.%u:%u>:",
664                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
665                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
666         else
667                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
668
669         if (p_ptr->publ.connected) {
670                 u32 dport = port_peerport(p_ptr);
671                 u32 destnode = port_peernode(p_ptr);
672
673                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
674                             tipc_zone(destnode), tipc_cluster(destnode),
675                             tipc_node(destnode), dport);
676                 if (p_ptr->publ.conn_type != 0)
677                         tipc_printf(buf, " via {%u,%u}",
678                                     p_ptr->publ.conn_type,
679                                     p_ptr->publ.conn_instance);
680         }
681         else if (p_ptr->publ.published) {
682                 tipc_printf(buf, " bound to");
683                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
684                         if (publ->lower == publ->upper)
685                                 tipc_printf(buf, " {%u,%u}", publ->type,
686                                             publ->lower);
687                         else
688                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
689                                             publ->lower, publ->upper);
690                 }
691         }
692         tipc_printf(buf, "\n");
693 }
694
695 #define MAX_PORT_QUERY 32768
696
697 struct sk_buff *tipc_port_get_ports(void)
698 {
699         struct sk_buff *buf;
700         struct tlv_desc *rep_tlv;
701         struct print_buf pb;
702         struct port *p_ptr;
703         int str_len;
704
705         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
706         if (!buf)
707                 return NULL;
708         rep_tlv = (struct tlv_desc *)buf->data;
709
710         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
711         spin_lock_bh(&tipc_port_list_lock);
712         list_for_each_entry(p_ptr, &ports, port_list) {
713                 spin_lock_bh(p_ptr->publ.lock);
714                 port_print(p_ptr, &pb, 0);
715                 spin_unlock_bh(p_ptr->publ.lock);
716         }
717         spin_unlock_bh(&tipc_port_list_lock);
718         str_len = tipc_printbuf_validate(&pb);
719
720         skb_put(buf, TLV_SPACE(str_len));
721         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
722
723         return buf;
724 }
725
726 #if 0
727
728 #define MAX_PORT_STATS 2000
729
730 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
731 {
732         u32 ref;
733         struct port *p_ptr;
734         struct sk_buff *buf;
735         struct tlv_desc *rep_tlv;
736         struct print_buf pb;
737         int str_len;
738
739         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
740                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
741
742         ref = *(u32 *)TLV_DATA(req_tlv_area);
743         ref = ntohl(ref);
744
745         p_ptr = tipc_port_lock(ref);
746         if (!p_ptr)
747                 return cfg_reply_error_string("port not found");
748
749         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
750         if (!buf) {
751                 tipc_port_unlock(p_ptr);
752                 return NULL;
753         }
754         rep_tlv = (struct tlv_desc *)buf->data;
755
756         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
757         port_print(p_ptr, &pb, 1);
758         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
759         tipc_port_unlock(p_ptr);
760         str_len = tipc_printbuf_validate(&pb);
761
762         skb_put(buf, TLV_SPACE(str_len));
763         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
764
765         return buf;
766 }
767
768 #endif
769
770 void tipc_port_reinit(void)
771 {
772         struct port *p_ptr;
773         struct tipc_msg *msg;
774
775         spin_lock_bh(&tipc_port_list_lock);
776         list_for_each_entry(p_ptr, &ports, port_list) {
777                 msg = &p_ptr->publ.phdr;
778                 if (msg_orignode(msg) == tipc_own_addr)
779                         break;
780                 msg_set_orignode(msg, tipc_own_addr);
781         }
782         spin_unlock_bh(&tipc_port_list_lock);
783 }
784
785
786 /*
787  *  port_dispatcher_sigh(): Signal handler for messages destinated
788  *                          to the tipc_port interface.
789  */
790
791 static void port_dispatcher_sigh(void *dummy)
792 {
793         struct sk_buff *buf;
794
795         spin_lock_bh(&queue_lock);
796         buf = msg_queue_head;
797         msg_queue_head = NULL;
798         spin_unlock_bh(&queue_lock);
799
800         while (buf) {
801                 struct port *p_ptr;
802                 struct user_port *up_ptr;
803                 struct tipc_portid orig;
804                 struct tipc_name_seq dseq;
805                 void *usr_handle;
806                 int connected;
807                 int published;
808                 u32 message_type;
809
810                 struct sk_buff *next = buf->next;
811                 struct tipc_msg *msg = buf_msg(buf);
812                 u32 dref = msg_destport(msg);
813
814                 message_type = msg_type(msg);
815                 if (message_type > TIPC_DIRECT_MSG)
816                         goto reject;    /* Unsupported message type */
817
818                 p_ptr = tipc_port_lock(dref);
819                 if (!p_ptr)
820                         goto reject;    /* Port deleted while msg in queue */
821
822                 orig.ref = msg_origport(msg);
823                 orig.node = msg_orignode(msg);
824                 up_ptr = p_ptr->user_port;
825                 usr_handle = up_ptr->usr_handle;
826                 connected = p_ptr->publ.connected;
827                 published = p_ptr->publ.published;
828
829                 if (unlikely(msg_errcode(msg)))
830                         goto err;
831
832                 switch (message_type) {
833
834                 case TIPC_CONN_MSG:{
835                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
836                                 u32 peer_port = port_peerport(p_ptr);
837                                 u32 peer_node = port_peernode(p_ptr);
838
839                                 tipc_port_unlock(p_ptr);
840                                 if (unlikely(!connected)) {
841                                         if (unlikely(published))
842                                                 goto reject;
843                                         tipc_connect2port(dref,&orig);
844                                 }
845                                 if (unlikely(msg_origport(msg) != peer_port))
846                                         goto reject;
847                                 if (unlikely(msg_orignode(msg) != peer_node))
848                                         goto reject;
849                                 if (unlikely(!cb))
850                                         goto reject;
851                                 if (unlikely(++p_ptr->publ.conn_unacked >=
852                                              TIPC_FLOW_CONTROL_WIN))
853                                         tipc_acknowledge(dref,
854                                                          p_ptr->publ.conn_unacked);
855                                 skb_pull(buf, msg_hdr_sz(msg));
856                                 cb(usr_handle, dref, &buf, msg_data(msg),
857                                    msg_data_sz(msg));
858                                 break;
859                         }
860                 case TIPC_DIRECT_MSG:{
861                                 tipc_msg_event cb = up_ptr->msg_cb;
862
863                                 tipc_port_unlock(p_ptr);
864                                 if (unlikely(connected))
865                                         goto reject;
866                                 if (unlikely(!cb))
867                                         goto reject;
868                                 skb_pull(buf, msg_hdr_sz(msg));
869                                 cb(usr_handle, dref, &buf, msg_data(msg),
870                                    msg_data_sz(msg), msg_importance(msg),
871                                    &orig);
872                                 break;
873                         }
874                 case TIPC_MCAST_MSG:
875                 case TIPC_NAMED_MSG:{
876                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
877
878                                 tipc_port_unlock(p_ptr);
879                                 if (unlikely(connected))
880                                         goto reject;
881                                 if (unlikely(!cb))
882                                         goto reject;
883                                 if (unlikely(!published))
884                                         goto reject;
885                                 dseq.type =  msg_nametype(msg);
886                                 dseq.lower = msg_nameinst(msg);
887                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
888                                         ? dseq.lower : msg_nameupper(msg);
889                                 skb_pull(buf, msg_hdr_sz(msg));
890                                 cb(usr_handle, dref, &buf, msg_data(msg),
891                                    msg_data_sz(msg), msg_importance(msg),
892                                    &orig, &dseq);
893                                 break;
894                         }
895                 }
896                 if (buf)
897                         buf_discard(buf);
898                 buf = next;
899                 continue;
900 err:
901                 switch (message_type) {
902
903                 case TIPC_CONN_MSG:{
904                                 tipc_conn_shutdown_event cb =
905                                         up_ptr->conn_err_cb;
906                                 u32 peer_port = port_peerport(p_ptr);
907                                 u32 peer_node = port_peernode(p_ptr);
908
909                                 tipc_port_unlock(p_ptr);
910                                 if (!connected || !cb)
911                                         break;
912                                 if (msg_origport(msg) != peer_port)
913                                         break;
914                                 if (msg_orignode(msg) != peer_node)
915                                         break;
916                                 tipc_disconnect(dref);
917                                 skb_pull(buf, msg_hdr_sz(msg));
918                                 cb(usr_handle, dref, &buf, msg_data(msg),
919                                    msg_data_sz(msg), msg_errcode(msg));
920                                 break;
921                         }
922                 case TIPC_DIRECT_MSG:{
923                                 tipc_msg_err_event cb = up_ptr->err_cb;
924
925                                 tipc_port_unlock(p_ptr);
926                                 if (connected || !cb)
927                                         break;
928                                 skb_pull(buf, msg_hdr_sz(msg));
929                                 cb(usr_handle, dref, &buf, msg_data(msg),
930                                    msg_data_sz(msg), msg_errcode(msg), &orig);
931                                 break;
932                         }
933                 case TIPC_MCAST_MSG:
934                 case TIPC_NAMED_MSG:{
935                                 tipc_named_msg_err_event cb =
936                                         up_ptr->named_err_cb;
937
938                                 tipc_port_unlock(p_ptr);
939                                 if (connected || !cb)
940                                         break;
941                                 dseq.type =  msg_nametype(msg);
942                                 dseq.lower = msg_nameinst(msg);
943                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
944                                         ? dseq.lower : msg_nameupper(msg);
945                                 skb_pull(buf, msg_hdr_sz(msg));
946                                 cb(usr_handle, dref, &buf, msg_data(msg),
947                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
948                                 break;
949                         }
950                 }
951                 if (buf)
952                         buf_discard(buf);
953                 buf = next;
954                 continue;
955 reject:
956                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
957                 buf = next;
958         }
959 }
960
961 /*
962  *  port_dispatcher(): Dispatcher for messages destinated
963  *  to the tipc_port interface. Called with port locked.
964  */
965
966 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
967 {
968         buf->next = NULL;
969         spin_lock_bh(&queue_lock);
970         if (msg_queue_head) {
971                 msg_queue_tail->next = buf;
972                 msg_queue_tail = buf;
973         } else {
974                 msg_queue_tail = msg_queue_head = buf;
975                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
976         }
977         spin_unlock_bh(&queue_lock);
978         return TIPC_OK;
979 }
980
981 /*
982  * Wake up port after congestion: Called with port locked,
983  *
984  */
985
986 static void port_wakeup_sh(unsigned long ref)
987 {
988         struct port *p_ptr;
989         struct user_port *up_ptr;
990         tipc_continue_event cb = NULL;
991         void *uh = NULL;
992
993         p_ptr = tipc_port_lock(ref);
994         if (p_ptr) {
995                 up_ptr = p_ptr->user_port;
996                 if (up_ptr) {
997                         cb = up_ptr->continue_event_cb;
998                         uh = up_ptr->usr_handle;
999                 }
1000                 tipc_port_unlock(p_ptr);
1001         }
1002         if (cb)
1003                 cb(uh, ref);
1004 }
1005
1006
1007 static void port_wakeup(struct tipc_port *p_ptr)
1008 {
1009         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1010 }
1011
1012 void tipc_acknowledge(u32 ref, u32 ack)
1013 {
1014         struct port *p_ptr;
1015         struct sk_buff *buf = NULL;
1016
1017         p_ptr = tipc_port_lock(ref);
1018         if (!p_ptr)
1019                 return;
1020         if (p_ptr->publ.connected) {
1021                 p_ptr->publ.conn_unacked -= ack;
1022                 buf = port_build_proto_msg(port_peerport(p_ptr),
1023                                            port_peernode(p_ptr),
1024                                            ref,
1025                                            tipc_own_addr,
1026                                            CONN_MANAGER,
1027                                            CONN_ACK,
1028                                            TIPC_OK,
1029                                            port_out_seqno(p_ptr),
1030                                            ack);
1031         }
1032         tipc_port_unlock(p_ptr);
1033         tipc_net_route_msg(buf);
1034 }
1035
1036 /*
1037  * tipc_createport(): user level call. Will add port to
1038  *                    registry if non-zero user_ref.
1039  */
1040
1041 int tipc_createport(u32 user_ref,
1042                     void *usr_handle,
1043                     unsigned int importance,
1044                     tipc_msg_err_event error_cb,
1045                     tipc_named_msg_err_event named_error_cb,
1046                     tipc_conn_shutdown_event conn_error_cb,
1047                     tipc_msg_event msg_cb,
1048                     tipc_named_msg_event named_msg_cb,
1049                     tipc_conn_msg_event conn_msg_cb,
1050                     tipc_continue_event continue_event_cb,/* May be zero */
1051                     u32 *portref)
1052 {
1053         struct user_port *up_ptr;
1054         struct port *p_ptr;
1055         u32 ref;
1056
1057         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1058         if (!up_ptr) {
1059                 warn("Port creation failed, no memory\n");
1060                 return -ENOMEM;
1061         }
1062         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1063         p_ptr = tipc_port_lock(ref);
1064         if (!p_ptr) {
1065                 kfree(up_ptr);
1066                 return -ENOMEM;
1067         }
1068
1069         p_ptr->user_port = up_ptr;
1070         up_ptr->user_ref = user_ref;
1071         up_ptr->usr_handle = usr_handle;
1072         up_ptr->ref = p_ptr->publ.ref;
1073         up_ptr->err_cb = error_cb;
1074         up_ptr->named_err_cb = named_error_cb;
1075         up_ptr->conn_err_cb = conn_error_cb;
1076         up_ptr->msg_cb = msg_cb;
1077         up_ptr->named_msg_cb = named_msg_cb;
1078         up_ptr->conn_msg_cb = conn_msg_cb;
1079         up_ptr->continue_event_cb = continue_event_cb;
1080         INIT_LIST_HEAD(&up_ptr->uport_list);
1081         tipc_reg_add_port(up_ptr);
1082         *portref = p_ptr->publ.ref;
1083         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1084         tipc_port_unlock(p_ptr);
1085         return TIPC_OK;
1086 }
1087
1088 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1089 {
1090         id->ref = ref;
1091         id->node = tipc_own_addr;
1092         return TIPC_OK;
1093 }
1094
1095 int tipc_portimportance(u32 ref, unsigned int *importance)
1096 {
1097         struct port *p_ptr;
1098
1099         p_ptr = tipc_port_lock(ref);
1100         if (!p_ptr)
1101                 return -EINVAL;
1102         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1103         tipc_port_unlock(p_ptr);
1104         return TIPC_OK;
1105 }
1106
1107 int tipc_set_portimportance(u32 ref, unsigned int imp)
1108 {
1109         struct port *p_ptr;
1110
1111         if (imp > TIPC_CRITICAL_IMPORTANCE)
1112                 return -EINVAL;
1113
1114         p_ptr = tipc_port_lock(ref);
1115         if (!p_ptr)
1116                 return -EINVAL;
1117         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1118         tipc_port_unlock(p_ptr);
1119         return TIPC_OK;
1120 }
1121
1122
1123 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1124 {
1125         struct port *p_ptr;
1126         struct publication *publ;
1127         u32 key;
1128         int res = -EINVAL;
1129
1130         p_ptr = tipc_port_lock(ref);
1131         if (!p_ptr)
1132                 return -EINVAL;
1133
1134         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1135             "lower = %u, upper = %u\n",
1136             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1137         if (p_ptr->publ.connected)
1138                 goto exit;
1139         if (seq->lower > seq->upper)
1140                 goto exit;
1141         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1142                 goto exit;
1143         key = ref + p_ptr->pub_count + 1;
1144         if (key == ref) {
1145                 res = -EADDRINUSE;
1146                 goto exit;
1147         }
1148         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1149                                     scope, p_ptr->publ.ref, key);
1150         if (publ) {
1151                 list_add(&publ->pport_list, &p_ptr->publications);
1152                 p_ptr->pub_count++;
1153                 p_ptr->publ.published = 1;
1154                 res = TIPC_OK;
1155         }
1156 exit:
1157         tipc_port_unlock(p_ptr);
1158         return res;
1159 }
1160
1161 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1162 {
1163         struct port *p_ptr;
1164         struct publication *publ;
1165         struct publication *tpubl;
1166         int res = -EINVAL;
1167
1168         p_ptr = tipc_port_lock(ref);
1169         if (!p_ptr)
1170                 return -EINVAL;
1171         if (!seq) {
1172                 list_for_each_entry_safe(publ, tpubl,
1173                                          &p_ptr->publications, pport_list) {
1174                         tipc_nametbl_withdraw(publ->type, publ->lower,
1175                                               publ->ref, publ->key);
1176                 }
1177                 res = TIPC_OK;
1178         } else {
1179                 list_for_each_entry_safe(publ, tpubl,
1180                                          &p_ptr->publications, pport_list) {
1181                         if (publ->scope != scope)
1182                                 continue;
1183                         if (publ->type != seq->type)
1184                                 continue;
1185                         if (publ->lower != seq->lower)
1186                                 continue;
1187                         if (publ->upper != seq->upper)
1188                                 break;
1189                         tipc_nametbl_withdraw(publ->type, publ->lower,
1190                                               publ->ref, publ->key);
1191                         res = TIPC_OK;
1192                         break;
1193                 }
1194         }
1195         if (list_empty(&p_ptr->publications))
1196                 p_ptr->publ.published = 0;
1197         tipc_port_unlock(p_ptr);
1198         return res;
1199 }
1200
1201 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1202 {
1203         struct port *p_ptr;
1204         struct tipc_msg *msg;
1205         int res = -EINVAL;
1206
1207         p_ptr = tipc_port_lock(ref);
1208         if (!p_ptr)
1209                 return -EINVAL;
1210         if (p_ptr->publ.published || p_ptr->publ.connected)
1211                 goto exit;
1212         if (!peer->ref)
1213                 goto exit;
1214
1215         msg = &p_ptr->publ.phdr;
1216         msg_set_destnode(msg, peer->node);
1217         msg_set_destport(msg, peer->ref);
1218         msg_set_orignode(msg, tipc_own_addr);
1219         msg_set_origport(msg, p_ptr->publ.ref);
1220         msg_set_transp_seqno(msg, 42);
1221         msg_set_type(msg, TIPC_CONN_MSG);
1222         if (!may_route(peer->node))
1223                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1224         else
1225                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1226
1227         p_ptr->probing_interval = PROBING_INTERVAL;
1228         p_ptr->probing_state = CONFIRMED;
1229         p_ptr->publ.connected = 1;
1230         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1231
1232         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1233                           (void *)(unsigned long)ref,
1234                           (net_ev_handler)port_handle_node_down);
1235         res = TIPC_OK;
1236 exit:
1237         tipc_port_unlock(p_ptr);
1238         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1239         return res;
1240 }
1241
1242 /*
1243  * tipc_disconnect(): Disconnect port form peer.
1244  *                    This is a node local operation.
1245  */
1246
1247 int tipc_disconnect(u32 ref)
1248 {
1249         struct port *p_ptr;
1250         int res = -ENOTCONN;
1251
1252         p_ptr = tipc_port_lock(ref);
1253         if (!p_ptr)
1254                 return -EINVAL;
1255         if (p_ptr->publ.connected) {
1256                 p_ptr->publ.connected = 0;
1257                 /* let timer expire on it's own to avoid deadlock! */
1258                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1259                 res = TIPC_OK;
1260         }
1261         tipc_port_unlock(p_ptr);
1262         return res;
1263 }
1264
1265 /*
1266  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1267  */
1268 int tipc_shutdown(u32 ref)
1269 {
1270         struct port *p_ptr;
1271         struct sk_buff *buf = NULL;
1272
1273         p_ptr = tipc_port_lock(ref);
1274         if (!p_ptr)
1275                 return -EINVAL;
1276
1277         if (p_ptr->publ.connected) {
1278                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1279                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1280                         imp++;
1281                 buf = port_build_proto_msg(port_peerport(p_ptr),
1282                                            port_peernode(p_ptr),
1283                                            ref,
1284                                            tipc_own_addr,
1285                                            imp,
1286                                            TIPC_CONN_MSG,
1287                                            TIPC_CONN_SHUTDOWN,
1288                                            port_out_seqno(p_ptr),
1289                                            0);
1290         }
1291         tipc_port_unlock(p_ptr);
1292         tipc_net_route_msg(buf);
1293         return tipc_disconnect(ref);
1294 }
1295
1296 int tipc_isconnected(u32 ref, int *isconnected)
1297 {
1298         struct port *p_ptr;
1299
1300         p_ptr = tipc_port_lock(ref);
1301         if (!p_ptr)
1302                 return -EINVAL;
1303         *isconnected = p_ptr->publ.connected;
1304         tipc_port_unlock(p_ptr);
1305         return TIPC_OK;
1306 }
1307
1308 int tipc_peer(u32 ref, struct tipc_portid *peer)
1309 {
1310         struct port *p_ptr;
1311         int res;
1312
1313         p_ptr = tipc_port_lock(ref);
1314         if (!p_ptr)
1315                 return -EINVAL;
1316         if (p_ptr->publ.connected) {
1317                 peer->ref = port_peerport(p_ptr);
1318                 peer->node = port_peernode(p_ptr);
1319                 res = TIPC_OK;
1320         } else
1321                 res = -ENOTCONN;
1322         tipc_port_unlock(p_ptr);
1323         return res;
1324 }
1325
1326 int tipc_ref_valid(u32 ref)
1327 {
1328         /* Works irrespective of type */
1329         return !!tipc_ref_deref(ref);
1330 }
1331
1332
1333 /*
1334  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1335  *                        message for this node.
1336  */
1337
1338 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1339                        struct iovec const *msg_sect)
1340 {
1341         struct sk_buff *buf;
1342         int res;
1343
1344         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1345                         MAX_MSG_SIZE, !sender->user_port, &buf);
1346         if (likely(buf))
1347                 tipc_port_recv_msg(buf);
1348         return res;
1349 }
1350
1351 /**
1352  * tipc_send - send message sections on connection
1353  */
1354
1355 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1356 {
1357         struct port *p_ptr;
1358         u32 destnode;
1359         int res;
1360
1361         p_ptr = tipc_port_deref(ref);
1362         if (!p_ptr || !p_ptr->publ.connected)
1363                 return -EINVAL;
1364
1365         p_ptr->publ.congested = 1;
1366         if (!tipc_port_congested(p_ptr)) {
1367                 destnode = port_peernode(p_ptr);
1368                 if (likely(destnode != tipc_own_addr))
1369                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1370                                                            destnode);
1371                 else
1372                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1373
1374                 if (likely(res != -ELINKCONG)) {
1375                         port_incr_out_seqno(p_ptr);
1376                         p_ptr->publ.congested = 0;
1377                         p_ptr->sent++;
1378                         return res;
1379                 }
1380         }
1381         if (port_unreliable(p_ptr)) {
1382                 p_ptr->publ.congested = 0;
1383                 /* Just calculate msg length and return */
1384                 return msg_calc_data_size(msg_sect, num_sect);
1385         }
1386         return -ELINKCONG;
1387 }
1388
1389 /**
1390  * tipc_send_buf - send message buffer on connection
1391  */
1392
1393 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1394 {
1395         struct port *p_ptr;
1396         struct tipc_msg *msg;
1397         u32 destnode;
1398         u32 hsz;
1399         u32 sz;
1400         u32 res;
1401
1402         p_ptr = tipc_port_deref(ref);
1403         if (!p_ptr || !p_ptr->publ.connected)
1404                 return -EINVAL;
1405
1406         msg = &p_ptr->publ.phdr;
1407         hsz = msg_hdr_sz(msg);
1408         sz = hsz + dsz;
1409         msg_set_size(msg, sz);
1410         if (skb_cow(buf, hsz))
1411                 return -ENOMEM;
1412
1413         skb_push(buf, hsz);
1414         skb_copy_to_linear_data(buf, msg, hsz);
1415         destnode = msg_destnode(msg);
1416         p_ptr->publ.congested = 1;
1417         if (!tipc_port_congested(p_ptr)) {
1418                 if (likely(destnode != tipc_own_addr))
1419                         res = tipc_send_buf_fast(buf, destnode);
1420                 else {
1421                         tipc_port_recv_msg(buf);
1422                         res = sz;
1423                 }
1424                 if (likely(res != -ELINKCONG)) {
1425                         port_incr_out_seqno(p_ptr);
1426                         p_ptr->sent++;
1427                         p_ptr->publ.congested = 0;
1428                         return res;
1429                 }
1430         }
1431         if (port_unreliable(p_ptr)) {
1432                 p_ptr->publ.congested = 0;
1433                 return dsz;
1434         }
1435         return -ELINKCONG;
1436 }
1437
1438 /**
1439  * tipc_forward2name - forward message sections to port name
1440  */
1441
1442 int tipc_forward2name(u32 ref,
1443                       struct tipc_name const *name,
1444                       u32 domain,
1445                       u32 num_sect,
1446                       struct iovec const *msg_sect,
1447                       struct tipc_portid const *orig,
1448                       unsigned int importance)
1449 {
1450         struct port *p_ptr;
1451         struct tipc_msg *msg;
1452         u32 destnode = domain;
1453         u32 destport = 0;
1454         int res;
1455
1456         p_ptr = tipc_port_deref(ref);
1457         if (!p_ptr || p_ptr->publ.connected)
1458                 return -EINVAL;
1459
1460         msg = &p_ptr->publ.phdr;
1461         msg_set_type(msg, TIPC_NAMED_MSG);
1462         msg_set_orignode(msg, orig->node);
1463         msg_set_origport(msg, orig->ref);
1464         msg_set_hdr_sz(msg, LONG_H_SIZE);
1465         msg_set_nametype(msg, name->type);
1466         msg_set_nameinst(msg, name->instance);
1467         msg_set_lookup_scope(msg, addr_scope(domain));
1468         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1469                 msg_set_importance(msg,importance);
1470         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1471         msg_set_destnode(msg, destnode);
1472         msg_set_destport(msg, destport);
1473
1474         if (likely(destport || destnode)) {
1475                 p_ptr->sent++;
1476                 if (likely(destnode == tipc_own_addr))
1477                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1478                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1479                                                    destnode);
1480                 if (likely(res != -ELINKCONG))
1481                         return res;
1482                 if (port_unreliable(p_ptr)) {
1483                         /* Just calculate msg length and return */
1484                         return msg_calc_data_size(msg_sect, num_sect);
1485                 }
1486                 return -ELINKCONG;
1487         }
1488         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1489                                          TIPC_ERR_NO_NAME);
1490 }
1491
1492 /**
1493  * tipc_send2name - send message sections to port name
1494  */
1495
1496 int tipc_send2name(u32 ref,
1497                    struct tipc_name const *name,
1498                    unsigned int domain,
1499                    unsigned int num_sect,
1500                    struct iovec const *msg_sect)
1501 {
1502         struct tipc_portid orig;
1503
1504         orig.ref = ref;
1505         orig.node = tipc_own_addr;
1506         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1507                                  TIPC_PORT_IMPORTANCE);
1508 }
1509
1510 /**
1511  * tipc_forward_buf2name - forward message buffer to port name
1512  */
1513
1514 int tipc_forward_buf2name(u32 ref,
1515                           struct tipc_name const *name,
1516                           u32 domain,
1517                           struct sk_buff *buf,
1518                           unsigned int dsz,
1519                           struct tipc_portid const *orig,
1520                           unsigned int importance)
1521 {
1522         struct port *p_ptr;
1523         struct tipc_msg *msg;
1524         u32 destnode = domain;
1525         u32 destport = 0;
1526         int res;
1527
1528         p_ptr = (struct port *)tipc_ref_deref(ref);
1529         if (!p_ptr || p_ptr->publ.connected)
1530                 return -EINVAL;
1531
1532         msg = &p_ptr->publ.phdr;
1533         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1534                 msg_set_importance(msg, importance);
1535         msg_set_type(msg, TIPC_NAMED_MSG);
1536         msg_set_orignode(msg, orig->node);
1537         msg_set_origport(msg, orig->ref);
1538         msg_set_nametype(msg, name->type);
1539         msg_set_nameinst(msg, name->instance);
1540         msg_set_lookup_scope(msg, addr_scope(domain));
1541         msg_set_hdr_sz(msg, LONG_H_SIZE);
1542         msg_set_size(msg, LONG_H_SIZE + dsz);
1543         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1544         msg_set_destnode(msg, destnode);
1545         msg_set_destport(msg, destport);
1546         msg_dbg(msg, "forw2name ==> ");
1547         if (skb_cow(buf, LONG_H_SIZE))
1548                 return -ENOMEM;
1549         skb_push(buf, LONG_H_SIZE);
1550         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1551         msg_dbg(buf_msg(buf),"PREP:");
1552         if (likely(destport || destnode)) {
1553                 p_ptr->sent++;
1554                 if (destnode == tipc_own_addr)
1555                         return tipc_port_recv_msg(buf);
1556                 res = tipc_send_buf_fast(buf, destnode);
1557                 if (likely(res != -ELINKCONG))
1558                         return res;
1559                 if (port_unreliable(p_ptr))
1560                         return dsz;
1561                 return -ELINKCONG;
1562         }
1563         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1564 }
1565
1566 /**
1567  * tipc_send_buf2name - send message buffer to port name
1568  */
1569
1570 int tipc_send_buf2name(u32 ref,
1571                        struct tipc_name const *dest,
1572                        u32 domain,
1573                        struct sk_buff *buf,
1574                        unsigned int dsz)
1575 {
1576         struct tipc_portid orig;
1577
1578         orig.ref = ref;
1579         orig.node = tipc_own_addr;
1580         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1581                                      TIPC_PORT_IMPORTANCE);
1582 }
1583
1584 /**
1585  * tipc_forward2port - forward message sections to port identity
1586  */
1587
1588 int tipc_forward2port(u32 ref,
1589                       struct tipc_portid const *dest,
1590                       unsigned int num_sect,
1591                       struct iovec const *msg_sect,
1592                       struct tipc_portid const *orig,
1593                       unsigned int importance)
1594 {
1595         struct port *p_ptr;
1596         struct tipc_msg *msg;
1597         int res;
1598
1599         p_ptr = tipc_port_deref(ref);
1600         if (!p_ptr || p_ptr->publ.connected)
1601                 return -EINVAL;
1602
1603         msg = &p_ptr->publ.phdr;
1604         msg_set_type(msg, TIPC_DIRECT_MSG);
1605         msg_set_orignode(msg, orig->node);
1606         msg_set_origport(msg, orig->ref);
1607         msg_set_destnode(msg, dest->node);
1608         msg_set_destport(msg, dest->ref);
1609         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1610         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1611                 msg_set_importance(msg, importance);
1612         p_ptr->sent++;
1613         if (dest->node == tipc_own_addr)
1614                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1615         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1616         if (likely(res != -ELINKCONG))
1617                 return res;
1618         if (port_unreliable(p_ptr)) {
1619                 /* Just calculate msg length and return */
1620                 return msg_calc_data_size(msg_sect, num_sect);
1621         }
1622         return -ELINKCONG;
1623 }
1624
1625 /**
1626  * tipc_send2port - send message sections to port identity
1627  */
1628
1629 int tipc_send2port(u32 ref,
1630                    struct tipc_portid const *dest,
1631                    unsigned int num_sect,
1632                    struct iovec const *msg_sect)
1633 {
1634         struct tipc_portid orig;
1635
1636         orig.ref = ref;
1637         orig.node = tipc_own_addr;
1638         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1639                                  TIPC_PORT_IMPORTANCE);
1640 }
1641
1642 /**
1643  * tipc_forward_buf2port - forward message buffer to port identity
1644  */
1645 int tipc_forward_buf2port(u32 ref,
1646                           struct tipc_portid const *dest,
1647                           struct sk_buff *buf,
1648                           unsigned int dsz,
1649                           struct tipc_portid const *orig,
1650                           unsigned int importance)
1651 {
1652         struct port *p_ptr;
1653         struct tipc_msg *msg;
1654         int res;
1655
1656         p_ptr = (struct port *)tipc_ref_deref(ref);
1657         if (!p_ptr || p_ptr->publ.connected)
1658                 return -EINVAL;
1659
1660         msg = &p_ptr->publ.phdr;
1661         msg_set_type(msg, TIPC_DIRECT_MSG);
1662         msg_set_orignode(msg, orig->node);
1663         msg_set_origport(msg, orig->ref);
1664         msg_set_destnode(msg, dest->node);
1665         msg_set_destport(msg, dest->ref);
1666         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1667         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1668                 msg_set_importance(msg, importance);
1669         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1670         if (skb_cow(buf, DIR_MSG_H_SIZE))
1671                 return -ENOMEM;
1672
1673         skb_push(buf, DIR_MSG_H_SIZE);
1674         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1675         msg_dbg(msg, "buf2port: ");
1676         p_ptr->sent++;
1677         if (dest->node == tipc_own_addr)
1678                 return tipc_port_recv_msg(buf);
1679         res = tipc_send_buf_fast(buf, dest->node);
1680         if (likely(res != -ELINKCONG))
1681                 return res;
1682         if (port_unreliable(p_ptr))
1683                 return dsz;
1684         return -ELINKCONG;
1685 }
1686
1687 /**
1688  * tipc_send_buf2port - send message buffer to port identity
1689  */
1690
1691 int tipc_send_buf2port(u32 ref,
1692                        struct tipc_portid const *dest,
1693                        struct sk_buff *buf,
1694                        unsigned int dsz)
1695 {
1696         struct tipc_portid orig;
1697
1698         orig.ref = ref;
1699         orig.node = tipc_own_addr;
1700         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1701                                      TIPC_PORT_IMPORTANCE);
1702 }
1703