[TIPC]: Overhaul of socket locking logic
[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, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, TIPC_OK, LONG_H_SIZE,
246                  0);
247         msg_set_orignode(msg, tipc_own_addr);
248         msg_set_prevnode(msg, tipc_own_addr);
249         msg_set_origport(msg, ref);
250         msg_set_importance(msg,importance);
251         p_ptr->last_in_seqno = 41;
252         p_ptr->sent = 1;
253         INIT_LIST_HEAD(&p_ptr->wait_list);
254         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
255         p_ptr->congested_link = NULL;
256         p_ptr->dispatcher = dispatcher;
257         p_ptr->wakeup = wakeup;
258         p_ptr->user_port = NULL;
259         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
260         spin_lock_bh(&tipc_port_list_lock);
261         INIT_LIST_HEAD(&p_ptr->publications);
262         INIT_LIST_HEAD(&p_ptr->port_list);
263         list_add_tail(&p_ptr->port_list, &ports);
264         spin_unlock_bh(&tipc_port_list_lock);
265         tipc_port_unlock(p_ptr);
266         return ref;
267 }
268
269 int tipc_deleteport(u32 ref)
270 {
271         struct port *p_ptr;
272         struct sk_buff *buf = NULL;
273
274         tipc_withdraw(ref, 0, NULL);
275         p_ptr = tipc_port_lock(ref);
276         if (!p_ptr)
277                 return -EINVAL;
278
279         tipc_ref_discard(ref);
280         tipc_port_unlock(p_ptr);
281
282         k_cancel_timer(&p_ptr->timer);
283         if (p_ptr->publ.connected) {
284                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
285                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
286         }
287         if (p_ptr->user_port) {
288                 tipc_reg_remove_port(p_ptr->user_port);
289                 kfree(p_ptr->user_port);
290         }
291
292         spin_lock_bh(&tipc_port_list_lock);
293         list_del(&p_ptr->port_list);
294         list_del(&p_ptr->wait_list);
295         spin_unlock_bh(&tipc_port_list_lock);
296         k_term_timer(&p_ptr->timer);
297         kfree(p_ptr);
298         dbg("Deleted port %u\n", ref);
299         tipc_net_route_msg(buf);
300         return TIPC_OK;
301 }
302
303 /**
304  * tipc_get_port() - return port associated with 'ref'
305  *
306  * Note: Port is not locked.
307  */
308
309 struct tipc_port *tipc_get_port(const u32 ref)
310 {
311         return (struct tipc_port *)tipc_ref_deref(ref);
312 }
313
314 /**
315  * tipc_get_handle - return user handle associated to port 'ref'
316  */
317
318 void *tipc_get_handle(const u32 ref)
319 {
320         struct port *p_ptr;
321         void * handle;
322
323         p_ptr = tipc_port_lock(ref);
324         if (!p_ptr)
325                 return NULL;
326         handle = p_ptr->publ.usr_handle;
327         tipc_port_unlock(p_ptr);
328         return handle;
329 }
330
331 static int port_unreliable(struct port *p_ptr)
332 {
333         return msg_src_droppable(&p_ptr->publ.phdr);
334 }
335
336 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
337 {
338         struct port *p_ptr;
339
340         p_ptr = tipc_port_lock(ref);
341         if (!p_ptr)
342                 return -EINVAL;
343         *isunreliable = port_unreliable(p_ptr);
344         tipc_port_unlock(p_ptr);
345         return TIPC_OK;
346 }
347
348 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
349 {
350         struct port *p_ptr;
351
352         p_ptr = tipc_port_lock(ref);
353         if (!p_ptr)
354                 return -EINVAL;
355         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
356         tipc_port_unlock(p_ptr);
357         return TIPC_OK;
358 }
359
360 static int port_unreturnable(struct port *p_ptr)
361 {
362         return msg_dest_droppable(&p_ptr->publ.phdr);
363 }
364
365 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
366 {
367         struct port *p_ptr;
368
369         p_ptr = tipc_port_lock(ref);
370         if (!p_ptr)
371                 return -EINVAL;
372         *isunrejectable = port_unreturnable(p_ptr);
373         tipc_port_unlock(p_ptr);
374         return TIPC_OK;
375 }
376
377 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
378 {
379         struct port *p_ptr;
380
381         p_ptr = tipc_port_lock(ref);
382         if (!p_ptr)
383                 return -EINVAL;
384         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
385         tipc_port_unlock(p_ptr);
386         return TIPC_OK;
387 }
388
389 /*
390  * port_build_proto_msg(): build a port level protocol
391  * or a connection abortion message. Called with
392  * tipc_port lock on.
393  */
394 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
395                                             u32 origport, u32 orignode,
396                                             u32 usr, u32 type, u32 err,
397                                             u32 seqno, u32 ack)
398 {
399         struct sk_buff *buf;
400         struct tipc_msg *msg;
401
402         buf = buf_acquire(LONG_H_SIZE);
403         if (buf) {
404                 msg = buf_msg(buf);
405                 msg_init(msg, usr, type, err, LONG_H_SIZE, destnode);
406                 msg_set_destport(msg, destport);
407                 msg_set_origport(msg, origport);
408                 msg_set_destnode(msg, destnode);
409                 msg_set_orignode(msg, orignode);
410                 msg_set_transp_seqno(msg, seqno);
411                 msg_set_msgcnt(msg, ack);
412                 msg_dbg(msg, "PORT>SEND>:");
413         }
414         return buf;
415 }
416
417 int tipc_reject_msg(struct sk_buff *buf, u32 err)
418 {
419         struct tipc_msg *msg = buf_msg(buf);
420         struct sk_buff *rbuf;
421         struct tipc_msg *rmsg;
422         int hdr_sz;
423         u32 imp = msg_importance(msg);
424         u32 data_sz = msg_data_sz(msg);
425
426         if (data_sz > MAX_REJECT_SIZE)
427                 data_sz = MAX_REJECT_SIZE;
428         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
429                 imp++;
430         msg_dbg(msg, "port->rej: ");
431
432         /* discard rejected message if it shouldn't be returned to sender */
433         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
434                 buf_discard(buf);
435                 return data_sz;
436         }
437
438         /* construct rejected message */
439         if (msg_mcast(msg))
440                 hdr_sz = MCAST_H_SIZE;
441         else
442                 hdr_sz = LONG_H_SIZE;
443         rbuf = buf_acquire(data_sz + hdr_sz);
444         if (rbuf == NULL) {
445                 buf_discard(buf);
446                 return data_sz;
447         }
448         rmsg = buf_msg(rbuf);
449         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
450         msg_set_destport(rmsg, msg_origport(msg));
451         msg_set_prevnode(rmsg, tipc_own_addr);
452         msg_set_origport(rmsg, msg_destport(msg));
453         if (msg_short(msg))
454                 msg_set_orignode(rmsg, tipc_own_addr);
455         else
456                 msg_set_orignode(rmsg, msg_destnode(msg));
457         msg_set_size(rmsg, data_sz + hdr_sz);
458         msg_set_nametype(rmsg, msg_nametype(msg));
459         msg_set_nameinst(rmsg, msg_nameinst(msg));
460         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
461
462         /* send self-abort message when rejecting on a connected port */
463         if (msg_connected(msg)) {
464                 struct sk_buff *abuf = NULL;
465                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
466
467                 if (p_ptr) {
468                         if (p_ptr->publ.connected)
469                                 abuf = port_build_self_abort_msg(p_ptr, err);
470                         tipc_port_unlock(p_ptr);
471                 }
472                 tipc_net_route_msg(abuf);
473         }
474
475         /* send rejected message */
476         buf_discard(buf);
477         tipc_net_route_msg(rbuf);
478         return data_sz;
479 }
480
481 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
482                               struct iovec const *msg_sect, u32 num_sect,
483                               int err)
484 {
485         struct sk_buff *buf;
486         int res;
487
488         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
489                         !p_ptr->user_port, &buf);
490         if (!buf)
491                 return res;
492
493         return tipc_reject_msg(buf, err);
494 }
495
496 static void port_timeout(unsigned long ref)
497 {
498         struct port *p_ptr = tipc_port_lock(ref);
499         struct sk_buff *buf = NULL;
500
501         if (!p_ptr)
502                 return;
503
504         if (!p_ptr->publ.connected) {
505                 tipc_port_unlock(p_ptr);
506                 return;
507         }
508
509         /* Last probe answered ? */
510         if (p_ptr->probing_state == PROBING) {
511                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
512         } else {
513                 buf = port_build_proto_msg(port_peerport(p_ptr),
514                                            port_peernode(p_ptr),
515                                            p_ptr->publ.ref,
516                                            tipc_own_addr,
517                                            CONN_MANAGER,
518                                            CONN_PROBE,
519                                            TIPC_OK,
520                                            port_out_seqno(p_ptr),
521                                            0);
522                 port_incr_out_seqno(p_ptr);
523                 p_ptr->probing_state = PROBING;
524                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
525         }
526         tipc_port_unlock(p_ptr);
527         tipc_net_route_msg(buf);
528 }
529
530
531 static void port_handle_node_down(unsigned long ref)
532 {
533         struct port *p_ptr = tipc_port_lock(ref);
534         struct sk_buff* buf = NULL;
535
536         if (!p_ptr)
537                 return;
538         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
539         tipc_port_unlock(p_ptr);
540         tipc_net_route_msg(buf);
541 }
542
543
544 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
545 {
546         u32 imp = msg_importance(&p_ptr->publ.phdr);
547
548         if (!p_ptr->publ.connected)
549                 return NULL;
550         if (imp < TIPC_CRITICAL_IMPORTANCE)
551                 imp++;
552         return port_build_proto_msg(p_ptr->publ.ref,
553                                     tipc_own_addr,
554                                     port_peerport(p_ptr),
555                                     port_peernode(p_ptr),
556                                     imp,
557                                     TIPC_CONN_MSG,
558                                     err,
559                                     p_ptr->last_in_seqno + 1,
560                                     0);
561 }
562
563
564 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
565 {
566         u32 imp = msg_importance(&p_ptr->publ.phdr);
567
568         if (!p_ptr->publ.connected)
569                 return NULL;
570         if (imp < TIPC_CRITICAL_IMPORTANCE)
571                 imp++;
572         return port_build_proto_msg(port_peerport(p_ptr),
573                                     port_peernode(p_ptr),
574                                     p_ptr->publ.ref,
575                                     tipc_own_addr,
576                                     imp,
577                                     TIPC_CONN_MSG,
578                                     err,
579                                     port_out_seqno(p_ptr),
580                                     0);
581 }
582
583 void tipc_port_recv_proto_msg(struct sk_buff *buf)
584 {
585         struct tipc_msg *msg = buf_msg(buf);
586         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
587         u32 err = TIPC_OK;
588         struct sk_buff *r_buf = NULL;
589         struct sk_buff *abort_buf = NULL;
590
591         msg_dbg(msg, "PORT<RECV<:");
592
593         if (!p_ptr) {
594                 err = TIPC_ERR_NO_PORT;
595         } else if (p_ptr->publ.connected) {
596                 if (port_peernode(p_ptr) != msg_orignode(msg))
597                         err = TIPC_ERR_NO_PORT;
598                 if (port_peerport(p_ptr) != msg_origport(msg))
599                         err = TIPC_ERR_NO_PORT;
600                 if (!err && msg_routed(msg)) {
601                         u32 seqno = msg_transp_seqno(msg);
602                         u32 myno =  ++p_ptr->last_in_seqno;
603                         if (seqno != myno) {
604                                 err = TIPC_ERR_NO_PORT;
605                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
606                         }
607                 }
608                 if (msg_type(msg) == CONN_ACK) {
609                         int wakeup = tipc_port_congested(p_ptr) &&
610                                      p_ptr->publ.congested &&
611                                      p_ptr->wakeup;
612                         p_ptr->acked += msg_msgcnt(msg);
613                         if (tipc_port_congested(p_ptr))
614                                 goto exit;
615                         p_ptr->publ.congested = 0;
616                         if (!wakeup)
617                                 goto exit;
618                         p_ptr->wakeup(&p_ptr->publ);
619                         goto exit;
620                 }
621         } else if (p_ptr->publ.published) {
622                 err = TIPC_ERR_NO_PORT;
623         }
624         if (err) {
625                 r_buf = port_build_proto_msg(msg_origport(msg),
626                                              msg_orignode(msg),
627                                              msg_destport(msg),
628                                              tipc_own_addr,
629                                              TIPC_HIGH_IMPORTANCE,
630                                              TIPC_CONN_MSG,
631                                              err,
632                                              0,
633                                              0);
634                 goto exit;
635         }
636
637         /* All is fine */
638         if (msg_type(msg) == CONN_PROBE) {
639                 r_buf = port_build_proto_msg(msg_origport(msg),
640                                              msg_orignode(msg),
641                                              msg_destport(msg),
642                                              tipc_own_addr,
643                                              CONN_MANAGER,
644                                              CONN_PROBE_REPLY,
645                                              TIPC_OK,
646                                              port_out_seqno(p_ptr),
647                                              0);
648         }
649         p_ptr->probing_state = CONFIRMED;
650         port_incr_out_seqno(p_ptr);
651 exit:
652         if (p_ptr)
653                 tipc_port_unlock(p_ptr);
654         tipc_net_route_msg(r_buf);
655         tipc_net_route_msg(abort_buf);
656         buf_discard(buf);
657 }
658
659 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
660 {
661         struct publication *publ;
662
663         if (full_id)
664                 tipc_printf(buf, "<%u.%u.%u:%u>:",
665                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
666                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
667         else
668                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
669
670         if (p_ptr->publ.connected) {
671                 u32 dport = port_peerport(p_ptr);
672                 u32 destnode = port_peernode(p_ptr);
673
674                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
675                             tipc_zone(destnode), tipc_cluster(destnode),
676                             tipc_node(destnode), dport);
677                 if (p_ptr->publ.conn_type != 0)
678                         tipc_printf(buf, " via {%u,%u}",
679                                     p_ptr->publ.conn_type,
680                                     p_ptr->publ.conn_instance);
681         }
682         else if (p_ptr->publ.published) {
683                 tipc_printf(buf, " bound to");
684                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
685                         if (publ->lower == publ->upper)
686                                 tipc_printf(buf, " {%u,%u}", publ->type,
687                                             publ->lower);
688                         else
689                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
690                                             publ->lower, publ->upper);
691                 }
692         }
693         tipc_printf(buf, "\n");
694 }
695
696 #define MAX_PORT_QUERY 32768
697
698 struct sk_buff *tipc_port_get_ports(void)
699 {
700         struct sk_buff *buf;
701         struct tlv_desc *rep_tlv;
702         struct print_buf pb;
703         struct port *p_ptr;
704         int str_len;
705
706         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
707         if (!buf)
708                 return NULL;
709         rep_tlv = (struct tlv_desc *)buf->data;
710
711         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
712         spin_lock_bh(&tipc_port_list_lock);
713         list_for_each_entry(p_ptr, &ports, port_list) {
714                 spin_lock_bh(p_ptr->publ.lock);
715                 port_print(p_ptr, &pb, 0);
716                 spin_unlock_bh(p_ptr->publ.lock);
717         }
718         spin_unlock_bh(&tipc_port_list_lock);
719         str_len = tipc_printbuf_validate(&pb);
720
721         skb_put(buf, TLV_SPACE(str_len));
722         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
723
724         return buf;
725 }
726
727 #if 0
728
729 #define MAX_PORT_STATS 2000
730
731 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
732 {
733         u32 ref;
734         struct port *p_ptr;
735         struct sk_buff *buf;
736         struct tlv_desc *rep_tlv;
737         struct print_buf pb;
738         int str_len;
739
740         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
741                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
742
743         ref = *(u32 *)TLV_DATA(req_tlv_area);
744         ref = ntohl(ref);
745
746         p_ptr = tipc_port_lock(ref);
747         if (!p_ptr)
748                 return cfg_reply_error_string("port not found");
749
750         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
751         if (!buf) {
752                 tipc_port_unlock(p_ptr);
753                 return NULL;
754         }
755         rep_tlv = (struct tlv_desc *)buf->data;
756
757         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
758         port_print(p_ptr, &pb, 1);
759         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
760         tipc_port_unlock(p_ptr);
761         str_len = tipc_printbuf_validate(&pb);
762
763         skb_put(buf, TLV_SPACE(str_len));
764         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
765
766         return buf;
767 }
768
769 #endif
770
771 void tipc_port_reinit(void)
772 {
773         struct port *p_ptr;
774         struct tipc_msg *msg;
775
776         spin_lock_bh(&tipc_port_list_lock);
777         list_for_each_entry(p_ptr, &ports, port_list) {
778                 msg = &p_ptr->publ.phdr;
779                 if (msg_orignode(msg) == tipc_own_addr)
780                         break;
781                 msg_set_orignode(msg, tipc_own_addr);
782         }
783         spin_unlock_bh(&tipc_port_list_lock);
784 }
785
786
787 /*
788  *  port_dispatcher_sigh(): Signal handler for messages destinated
789  *                          to the tipc_port interface.
790  */
791
792 static void port_dispatcher_sigh(void *dummy)
793 {
794         struct sk_buff *buf;
795
796         spin_lock_bh(&queue_lock);
797         buf = msg_queue_head;
798         msg_queue_head = NULL;
799         spin_unlock_bh(&queue_lock);
800
801         while (buf) {
802                 struct port *p_ptr;
803                 struct user_port *up_ptr;
804                 struct tipc_portid orig;
805                 struct tipc_name_seq dseq;
806                 void *usr_handle;
807                 int connected;
808                 int published;
809                 u32 message_type;
810
811                 struct sk_buff *next = buf->next;
812                 struct tipc_msg *msg = buf_msg(buf);
813                 u32 dref = msg_destport(msg);
814
815                 message_type = msg_type(msg);
816                 if (message_type > TIPC_DIRECT_MSG)
817                         goto reject;    /* Unsupported message type */
818
819                 p_ptr = tipc_port_lock(dref);
820                 if (!p_ptr)
821                         goto reject;    /* Port deleted while msg in queue */
822
823                 orig.ref = msg_origport(msg);
824                 orig.node = msg_orignode(msg);
825                 up_ptr = p_ptr->user_port;
826                 usr_handle = up_ptr->usr_handle;
827                 connected = p_ptr->publ.connected;
828                 published = p_ptr->publ.published;
829
830                 if (unlikely(msg_errcode(msg)))
831                         goto err;
832
833                 switch (message_type) {
834
835                 case TIPC_CONN_MSG:{
836                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
837                                 u32 peer_port = port_peerport(p_ptr);
838                                 u32 peer_node = port_peernode(p_ptr);
839
840                                 tipc_port_unlock(p_ptr);
841                                 if (unlikely(!connected)) {
842                                         if (unlikely(published))
843                                                 goto reject;
844                                         tipc_connect2port(dref,&orig);
845                                 }
846                                 if (unlikely(msg_origport(msg) != peer_port))
847                                         goto reject;
848                                 if (unlikely(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         u32 ref;
1057
1058         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1059         if (!up_ptr) {
1060                 warn("Port creation failed, no memory\n");
1061                 return -ENOMEM;
1062         }
1063         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1064         p_ptr = tipc_port_lock(ref);
1065         if (!p_ptr) {
1066                 kfree(up_ptr);
1067                 return -ENOMEM;
1068         }
1069
1070         p_ptr->user_port = up_ptr;
1071         up_ptr->user_ref = user_ref;
1072         up_ptr->usr_handle = usr_handle;
1073         up_ptr->ref = p_ptr->publ.ref;
1074         up_ptr->err_cb = error_cb;
1075         up_ptr->named_err_cb = named_error_cb;
1076         up_ptr->conn_err_cb = conn_error_cb;
1077         up_ptr->msg_cb = msg_cb;
1078         up_ptr->named_msg_cb = named_msg_cb;
1079         up_ptr->conn_msg_cb = conn_msg_cb;
1080         up_ptr->continue_event_cb = continue_event_cb;
1081         INIT_LIST_HEAD(&up_ptr->uport_list);
1082         tipc_reg_add_port(up_ptr);
1083         *portref = p_ptr->publ.ref;
1084         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1085         tipc_port_unlock(p_ptr);
1086         return TIPC_OK;
1087 }
1088
1089 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1090 {
1091         id->ref = ref;
1092         id->node = tipc_own_addr;
1093         return TIPC_OK;
1094 }
1095
1096 int tipc_portimportance(u32 ref, unsigned int *importance)
1097 {
1098         struct port *p_ptr;
1099
1100         p_ptr = tipc_port_lock(ref);
1101         if (!p_ptr)
1102                 return -EINVAL;
1103         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1104         tipc_port_unlock(p_ptr);
1105         return TIPC_OK;
1106 }
1107
1108 int tipc_set_portimportance(u32 ref, unsigned int imp)
1109 {
1110         struct port *p_ptr;
1111
1112         if (imp > TIPC_CRITICAL_IMPORTANCE)
1113                 return -EINVAL;
1114
1115         p_ptr = tipc_port_lock(ref);
1116         if (!p_ptr)
1117                 return -EINVAL;
1118         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1119         tipc_port_unlock(p_ptr);
1120         return TIPC_OK;
1121 }
1122
1123
1124 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1125 {
1126         struct port *p_ptr;
1127         struct publication *publ;
1128         u32 key;
1129         int res = -EINVAL;
1130
1131         p_ptr = tipc_port_lock(ref);
1132         if (!p_ptr)
1133                 return -EINVAL;
1134
1135         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1136             "lower = %u, upper = %u\n",
1137             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1138         if (p_ptr->publ.connected)
1139                 goto exit;
1140         if (seq->lower > seq->upper)
1141                 goto exit;
1142         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1143                 goto exit;
1144         key = ref + p_ptr->pub_count + 1;
1145         if (key == ref) {
1146                 res = -EADDRINUSE;
1147                 goto exit;
1148         }
1149         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1150                                     scope, p_ptr->publ.ref, key);
1151         if (publ) {
1152                 list_add(&publ->pport_list, &p_ptr->publications);
1153                 p_ptr->pub_count++;
1154                 p_ptr->publ.published = 1;
1155                 res = TIPC_OK;
1156         }
1157 exit:
1158         tipc_port_unlock(p_ptr);
1159         return res;
1160 }
1161
1162 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1163 {
1164         struct port *p_ptr;
1165         struct publication *publ;
1166         struct publication *tpubl;
1167         int res = -EINVAL;
1168
1169         p_ptr = tipc_port_lock(ref);
1170         if (!p_ptr)
1171                 return -EINVAL;
1172         if (!seq) {
1173                 list_for_each_entry_safe(publ, tpubl,
1174                                          &p_ptr->publications, pport_list) {
1175                         tipc_nametbl_withdraw(publ->type, publ->lower,
1176                                               publ->ref, publ->key);
1177                 }
1178                 res = TIPC_OK;
1179         } else {
1180                 list_for_each_entry_safe(publ, tpubl,
1181                                          &p_ptr->publications, pport_list) {
1182                         if (publ->scope != scope)
1183                                 continue;
1184                         if (publ->type != seq->type)
1185                                 continue;
1186                         if (publ->lower != seq->lower)
1187                                 continue;
1188                         if (publ->upper != seq->upper)
1189                                 break;
1190                         tipc_nametbl_withdraw(publ->type, publ->lower,
1191                                               publ->ref, publ->key);
1192                         res = TIPC_OK;
1193                         break;
1194                 }
1195         }
1196         if (list_empty(&p_ptr->publications))
1197                 p_ptr->publ.published = 0;
1198         tipc_port_unlock(p_ptr);
1199         return res;
1200 }
1201
1202 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1203 {
1204         struct port *p_ptr;
1205         struct tipc_msg *msg;
1206         int res = -EINVAL;
1207
1208         p_ptr = tipc_port_lock(ref);
1209         if (!p_ptr)
1210                 return -EINVAL;
1211         if (p_ptr->publ.published || p_ptr->publ.connected)
1212                 goto exit;
1213         if (!peer->ref)
1214                 goto exit;
1215
1216         msg = &p_ptr->publ.phdr;
1217         msg_set_destnode(msg, peer->node);
1218         msg_set_destport(msg, peer->ref);
1219         msg_set_orignode(msg, tipc_own_addr);
1220         msg_set_origport(msg, p_ptr->publ.ref);
1221         msg_set_transp_seqno(msg, 42);
1222         msg_set_type(msg, TIPC_CONN_MSG);
1223         if (!may_route(peer->node))
1224                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1225         else
1226                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1227
1228         p_ptr->probing_interval = PROBING_INTERVAL;
1229         p_ptr->probing_state = CONFIRMED;
1230         p_ptr->publ.connected = 1;
1231         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1232
1233         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1234                           (void *)(unsigned long)ref,
1235                           (net_ev_handler)port_handle_node_down);
1236         res = TIPC_OK;
1237 exit:
1238         tipc_port_unlock(p_ptr);
1239         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1240         return res;
1241 }
1242
1243 /**
1244  * tipc_disconnect_port - disconnect port from peer
1245  *
1246  * Port must be locked.
1247  */
1248
1249 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1250 {
1251         int res;
1252
1253         if (tp_ptr->connected) {
1254                 tp_ptr->connected = 0;
1255                 /* let timer expire on it's own to avoid deadlock! */
1256                 tipc_nodesub_unsubscribe(
1257                         &((struct port *)tp_ptr)->subscription);
1258                 res = TIPC_OK;
1259         } else {
1260                 res = -ENOTCONN;
1261         }
1262         return res;
1263 }
1264
1265 /*
1266  * tipc_disconnect(): Disconnect port form peer.
1267  *                    This is a node local operation.
1268  */
1269
1270 int tipc_disconnect(u32 ref)
1271 {
1272         struct port *p_ptr;
1273         int res;
1274
1275         p_ptr = tipc_port_lock(ref);
1276         if (!p_ptr)
1277                 return -EINVAL;
1278         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1279         tipc_port_unlock(p_ptr);
1280         return res;
1281 }
1282
1283 /*
1284  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1285  */
1286 int tipc_shutdown(u32 ref)
1287 {
1288         struct port *p_ptr;
1289         struct sk_buff *buf = NULL;
1290
1291         p_ptr = tipc_port_lock(ref);
1292         if (!p_ptr)
1293                 return -EINVAL;
1294
1295         if (p_ptr->publ.connected) {
1296                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1297                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1298                         imp++;
1299                 buf = port_build_proto_msg(port_peerport(p_ptr),
1300                                            port_peernode(p_ptr),
1301                                            ref,
1302                                            tipc_own_addr,
1303                                            imp,
1304                                            TIPC_CONN_MSG,
1305                                            TIPC_CONN_SHUTDOWN,
1306                                            port_out_seqno(p_ptr),
1307                                            0);
1308         }
1309         tipc_port_unlock(p_ptr);
1310         tipc_net_route_msg(buf);
1311         return tipc_disconnect(ref);
1312 }
1313
1314 int tipc_isconnected(u32 ref, int *isconnected)
1315 {
1316         struct port *p_ptr;
1317
1318         p_ptr = tipc_port_lock(ref);
1319         if (!p_ptr)
1320                 return -EINVAL;
1321         *isconnected = p_ptr->publ.connected;
1322         tipc_port_unlock(p_ptr);
1323         return TIPC_OK;
1324 }
1325
1326 int tipc_peer(u32 ref, struct tipc_portid *peer)
1327 {
1328         struct port *p_ptr;
1329         int res;
1330
1331         p_ptr = tipc_port_lock(ref);
1332         if (!p_ptr)
1333                 return -EINVAL;
1334         if (p_ptr->publ.connected) {
1335                 peer->ref = port_peerport(p_ptr);
1336                 peer->node = port_peernode(p_ptr);
1337                 res = TIPC_OK;
1338         } else
1339                 res = -ENOTCONN;
1340         tipc_port_unlock(p_ptr);
1341         return res;
1342 }
1343
1344 int tipc_ref_valid(u32 ref)
1345 {
1346         /* Works irrespective of type */
1347         return !!tipc_ref_deref(ref);
1348 }
1349
1350
1351 /*
1352  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1353  *                        message for this node.
1354  */
1355
1356 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1357                        struct iovec const *msg_sect)
1358 {
1359         struct sk_buff *buf;
1360         int res;
1361
1362         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1363                         MAX_MSG_SIZE, !sender->user_port, &buf);
1364         if (likely(buf))
1365                 tipc_port_recv_msg(buf);
1366         return res;
1367 }
1368
1369 /**
1370  * tipc_send - send message sections on connection
1371  */
1372
1373 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1374 {
1375         struct port *p_ptr;
1376         u32 destnode;
1377         int res;
1378
1379         p_ptr = tipc_port_deref(ref);
1380         if (!p_ptr || !p_ptr->publ.connected)
1381                 return -EINVAL;
1382
1383         p_ptr->publ.congested = 1;
1384         if (!tipc_port_congested(p_ptr)) {
1385                 destnode = port_peernode(p_ptr);
1386                 if (likely(destnode != tipc_own_addr))
1387                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1388                                                            destnode);
1389                 else
1390                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1391
1392                 if (likely(res != -ELINKCONG)) {
1393                         port_incr_out_seqno(p_ptr);
1394                         p_ptr->publ.congested = 0;
1395                         p_ptr->sent++;
1396                         return res;
1397                 }
1398         }
1399         if (port_unreliable(p_ptr)) {
1400                 p_ptr->publ.congested = 0;
1401                 /* Just calculate msg length and return */
1402                 return msg_calc_data_size(msg_sect, num_sect);
1403         }
1404         return -ELINKCONG;
1405 }
1406
1407 /**
1408  * tipc_send_buf - send message buffer on connection
1409  */
1410
1411 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1412 {
1413         struct port *p_ptr;
1414         struct tipc_msg *msg;
1415         u32 destnode;
1416         u32 hsz;
1417         u32 sz;
1418         u32 res;
1419
1420         p_ptr = tipc_port_deref(ref);
1421         if (!p_ptr || !p_ptr->publ.connected)
1422                 return -EINVAL;
1423
1424         msg = &p_ptr->publ.phdr;
1425         hsz = msg_hdr_sz(msg);
1426         sz = hsz + dsz;
1427         msg_set_size(msg, sz);
1428         if (skb_cow(buf, hsz))
1429                 return -ENOMEM;
1430
1431         skb_push(buf, hsz);
1432         skb_copy_to_linear_data(buf, msg, hsz);
1433         destnode = msg_destnode(msg);
1434         p_ptr->publ.congested = 1;
1435         if (!tipc_port_congested(p_ptr)) {
1436                 if (likely(destnode != tipc_own_addr))
1437                         res = tipc_send_buf_fast(buf, destnode);
1438                 else {
1439                         tipc_port_recv_msg(buf);
1440                         res = sz;
1441                 }
1442                 if (likely(res != -ELINKCONG)) {
1443                         port_incr_out_seqno(p_ptr);
1444                         p_ptr->sent++;
1445                         p_ptr->publ.congested = 0;
1446                         return res;
1447                 }
1448         }
1449         if (port_unreliable(p_ptr)) {
1450                 p_ptr->publ.congested = 0;
1451                 return dsz;
1452         }
1453         return -ELINKCONG;
1454 }
1455
1456 /**
1457  * tipc_forward2name - forward message sections to port name
1458  */
1459
1460 int tipc_forward2name(u32 ref,
1461                       struct tipc_name const *name,
1462                       u32 domain,
1463                       u32 num_sect,
1464                       struct iovec const *msg_sect,
1465                       struct tipc_portid const *orig,
1466                       unsigned int importance)
1467 {
1468         struct port *p_ptr;
1469         struct tipc_msg *msg;
1470         u32 destnode = domain;
1471         u32 destport = 0;
1472         int res;
1473
1474         p_ptr = tipc_port_deref(ref);
1475         if (!p_ptr || p_ptr->publ.connected)
1476                 return -EINVAL;
1477
1478         msg = &p_ptr->publ.phdr;
1479         msg_set_type(msg, TIPC_NAMED_MSG);
1480         msg_set_orignode(msg, orig->node);
1481         msg_set_origport(msg, orig->ref);
1482         msg_set_hdr_sz(msg, LONG_H_SIZE);
1483         msg_set_nametype(msg, name->type);
1484         msg_set_nameinst(msg, name->instance);
1485         msg_set_lookup_scope(msg, addr_scope(domain));
1486         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1487                 msg_set_importance(msg,importance);
1488         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1489         msg_set_destnode(msg, destnode);
1490         msg_set_destport(msg, destport);
1491
1492         if (likely(destport || destnode)) {
1493                 p_ptr->sent++;
1494                 if (likely(destnode == tipc_own_addr))
1495                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1496                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1497                                                    destnode);
1498                 if (likely(res != -ELINKCONG))
1499                         return res;
1500                 if (port_unreliable(p_ptr)) {
1501                         /* Just calculate msg length and return */
1502                         return msg_calc_data_size(msg_sect, num_sect);
1503                 }
1504                 return -ELINKCONG;
1505         }
1506         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1507                                          TIPC_ERR_NO_NAME);
1508 }
1509
1510 /**
1511  * tipc_send2name - send message sections to port name
1512  */
1513
1514 int tipc_send2name(u32 ref,
1515                    struct tipc_name const *name,
1516                    unsigned int domain,
1517                    unsigned int num_sect,
1518                    struct iovec const *msg_sect)
1519 {
1520         struct tipc_portid orig;
1521
1522         orig.ref = ref;
1523         orig.node = tipc_own_addr;
1524         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1525                                  TIPC_PORT_IMPORTANCE);
1526 }
1527
1528 /**
1529  * tipc_forward_buf2name - forward message buffer to port name
1530  */
1531
1532 int tipc_forward_buf2name(u32 ref,
1533                           struct tipc_name const *name,
1534                           u32 domain,
1535                           struct sk_buff *buf,
1536                           unsigned int dsz,
1537                           struct tipc_portid const *orig,
1538                           unsigned int importance)
1539 {
1540         struct port *p_ptr;
1541         struct tipc_msg *msg;
1542         u32 destnode = domain;
1543         u32 destport = 0;
1544         int res;
1545
1546         p_ptr = (struct port *)tipc_ref_deref(ref);
1547         if (!p_ptr || p_ptr->publ.connected)
1548                 return -EINVAL;
1549
1550         msg = &p_ptr->publ.phdr;
1551         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1552                 msg_set_importance(msg, importance);
1553         msg_set_type(msg, TIPC_NAMED_MSG);
1554         msg_set_orignode(msg, orig->node);
1555         msg_set_origport(msg, orig->ref);
1556         msg_set_nametype(msg, name->type);
1557         msg_set_nameinst(msg, name->instance);
1558         msg_set_lookup_scope(msg, addr_scope(domain));
1559         msg_set_hdr_sz(msg, LONG_H_SIZE);
1560         msg_set_size(msg, LONG_H_SIZE + dsz);
1561         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1562         msg_set_destnode(msg, destnode);
1563         msg_set_destport(msg, destport);
1564         msg_dbg(msg, "forw2name ==> ");
1565         if (skb_cow(buf, LONG_H_SIZE))
1566                 return -ENOMEM;
1567         skb_push(buf, LONG_H_SIZE);
1568         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1569         msg_dbg(buf_msg(buf),"PREP:");
1570         if (likely(destport || destnode)) {
1571                 p_ptr->sent++;
1572                 if (destnode == tipc_own_addr)
1573                         return tipc_port_recv_msg(buf);
1574                 res = tipc_send_buf_fast(buf, destnode);
1575                 if (likely(res != -ELINKCONG))
1576                         return res;
1577                 if (port_unreliable(p_ptr))
1578                         return dsz;
1579                 return -ELINKCONG;
1580         }
1581         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1582 }
1583
1584 /**
1585  * tipc_send_buf2name - send message buffer to port name
1586  */
1587
1588 int tipc_send_buf2name(u32 ref,
1589                        struct tipc_name const *dest,
1590                        u32 domain,
1591                        struct sk_buff *buf,
1592                        unsigned int dsz)
1593 {
1594         struct tipc_portid orig;
1595
1596         orig.ref = ref;
1597         orig.node = tipc_own_addr;
1598         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1599                                      TIPC_PORT_IMPORTANCE);
1600 }
1601
1602 /**
1603  * tipc_forward2port - forward message sections to port identity
1604  */
1605
1606 int tipc_forward2port(u32 ref,
1607                       struct tipc_portid const *dest,
1608                       unsigned int num_sect,
1609                       struct iovec const *msg_sect,
1610                       struct tipc_portid const *orig,
1611                       unsigned int importance)
1612 {
1613         struct port *p_ptr;
1614         struct tipc_msg *msg;
1615         int res;
1616
1617         p_ptr = tipc_port_deref(ref);
1618         if (!p_ptr || p_ptr->publ.connected)
1619                 return -EINVAL;
1620
1621         msg = &p_ptr->publ.phdr;
1622         msg_set_type(msg, TIPC_DIRECT_MSG);
1623         msg_set_orignode(msg, orig->node);
1624         msg_set_origport(msg, orig->ref);
1625         msg_set_destnode(msg, dest->node);
1626         msg_set_destport(msg, dest->ref);
1627         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1628         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1629                 msg_set_importance(msg, importance);
1630         p_ptr->sent++;
1631         if (dest->node == tipc_own_addr)
1632                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1633         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1634         if (likely(res != -ELINKCONG))
1635                 return res;
1636         if (port_unreliable(p_ptr)) {
1637                 /* Just calculate msg length and return */
1638                 return msg_calc_data_size(msg_sect, num_sect);
1639         }
1640         return -ELINKCONG;
1641 }
1642
1643 /**
1644  * tipc_send2port - send message sections to port identity
1645  */
1646
1647 int tipc_send2port(u32 ref,
1648                    struct tipc_portid const *dest,
1649                    unsigned int num_sect,
1650                    struct iovec const *msg_sect)
1651 {
1652         struct tipc_portid orig;
1653
1654         orig.ref = ref;
1655         orig.node = tipc_own_addr;
1656         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1657                                  TIPC_PORT_IMPORTANCE);
1658 }
1659
1660 /**
1661  * tipc_forward_buf2port - forward message buffer to port identity
1662  */
1663 int tipc_forward_buf2port(u32 ref,
1664                           struct tipc_portid const *dest,
1665                           struct sk_buff *buf,
1666                           unsigned int dsz,
1667                           struct tipc_portid const *orig,
1668                           unsigned int importance)
1669 {
1670         struct port *p_ptr;
1671         struct tipc_msg *msg;
1672         int res;
1673
1674         p_ptr = (struct port *)tipc_ref_deref(ref);
1675         if (!p_ptr || p_ptr->publ.connected)
1676                 return -EINVAL;
1677
1678         msg = &p_ptr->publ.phdr;
1679         msg_set_type(msg, TIPC_DIRECT_MSG);
1680         msg_set_orignode(msg, orig->node);
1681         msg_set_origport(msg, orig->ref);
1682         msg_set_destnode(msg, dest->node);
1683         msg_set_destport(msg, dest->ref);
1684         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1685         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1686                 msg_set_importance(msg, importance);
1687         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1688         if (skb_cow(buf, DIR_MSG_H_SIZE))
1689                 return -ENOMEM;
1690
1691         skb_push(buf, DIR_MSG_H_SIZE);
1692         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1693         msg_dbg(msg, "buf2port: ");
1694         p_ptr->sent++;
1695         if (dest->node == tipc_own_addr)
1696                 return tipc_port_recv_msg(buf);
1697         res = tipc_send_buf_fast(buf, dest->node);
1698         if (likely(res != -ELINKCONG))
1699                 return res;
1700         if (port_unreliable(p_ptr))
1701                 return dsz;
1702         return -ELINKCONG;
1703 }
1704
1705 /**
1706  * tipc_send_buf2port - send message buffer to port identity
1707  */
1708
1709 int tipc_send_buf2port(u32 ref,
1710                        struct tipc_portid const *dest,
1711                        struct sk_buff *buf,
1712                        unsigned int dsz)
1713 {
1714         struct tipc_portid orig;
1715
1716         orig.ref = ref;
1717         orig.node = tipc_own_addr;
1718         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1719                                      TIPC_PORT_IMPORTANCE);
1720 }
1721