76088153524cf2da2d22f20a4ccdef77643a15be
[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         spin_unlock_bh(p_ptr->publ.lock);
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         spin_unlock_bh(p_ptr->publ.lock);
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_set_msg_option(struct tipc_port *tp_ptr, const char *opt, const u32 sz)
417 {
418         msg_expand(&tp_ptr->phdr, msg_destnode(&tp_ptr->phdr));
419         msg_set_options(&tp_ptr->phdr, opt, sz);
420         return TIPC_OK;
421 }
422
423 int tipc_reject_msg(struct sk_buff *buf, u32 err)
424 {
425         struct tipc_msg *msg = buf_msg(buf);
426         struct sk_buff *rbuf;
427         struct tipc_msg *rmsg;
428         int hdr_sz;
429         u32 imp = msg_importance(msg);
430         u32 data_sz = msg_data_sz(msg);
431
432         if (data_sz > MAX_REJECT_SIZE)
433                 data_sz = MAX_REJECT_SIZE;
434         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
435                 imp++;
436         msg_dbg(msg, "port->rej: ");
437
438         /* discard rejected message if it shouldn't be returned to sender */
439         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
440                 buf_discard(buf);
441                 return data_sz;
442         }
443
444         /* construct rejected message */
445         if (msg_mcast(msg))
446                 hdr_sz = MCAST_H_SIZE;
447         else
448                 hdr_sz = LONG_H_SIZE;
449         rbuf = buf_acquire(data_sz + hdr_sz);
450         if (rbuf == NULL) {
451                 buf_discard(buf);
452                 return data_sz;
453         }
454         rmsg = buf_msg(rbuf);
455         msg_init(rmsg, imp, msg_type(msg), err, hdr_sz, msg_orignode(msg));
456         msg_set_destport(rmsg, msg_origport(msg));
457         msg_set_prevnode(rmsg, tipc_own_addr);
458         msg_set_origport(rmsg, msg_destport(msg));
459         if (msg_short(msg))
460                 msg_set_orignode(rmsg, tipc_own_addr);
461         else
462                 msg_set_orignode(rmsg, msg_destnode(msg));
463         msg_set_size(rmsg, data_sz + hdr_sz);
464         msg_set_nametype(rmsg, msg_nametype(msg));
465         msg_set_nameinst(rmsg, msg_nameinst(msg));
466         skb_copy_to_linear_data_offset(rbuf, hdr_sz, msg_data(msg), data_sz);
467
468         /* send self-abort message when rejecting on a connected port */
469         if (msg_connected(msg)) {
470                 struct sk_buff *abuf = NULL;
471                 struct port *p_ptr = tipc_port_lock(msg_destport(msg));
472
473                 if (p_ptr) {
474                         if (p_ptr->publ.connected)
475                                 abuf = port_build_self_abort_msg(p_ptr, err);
476                         tipc_port_unlock(p_ptr);
477                 }
478                 tipc_net_route_msg(abuf);
479         }
480
481         /* send rejected message */
482         buf_discard(buf);
483         tipc_net_route_msg(rbuf);
484         return data_sz;
485 }
486
487 int tipc_port_reject_sections(struct port *p_ptr, struct tipc_msg *hdr,
488                               struct iovec const *msg_sect, u32 num_sect,
489                               int err)
490 {
491         struct sk_buff *buf;
492         int res;
493
494         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
495                         !p_ptr->user_port, &buf);
496         if (!buf)
497                 return res;
498
499         return tipc_reject_msg(buf, err);
500 }
501
502 static void port_timeout(unsigned long ref)
503 {
504         struct port *p_ptr = tipc_port_lock(ref);
505         struct sk_buff *buf = NULL;
506
507         if (!p_ptr)
508                 return;
509
510         if (!p_ptr->publ.connected) {
511                 tipc_port_unlock(p_ptr);
512                 return;
513         }
514
515         /* Last probe answered ? */
516         if (p_ptr->probing_state == PROBING) {
517                 buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
518         } else {
519                 buf = port_build_proto_msg(port_peerport(p_ptr),
520                                            port_peernode(p_ptr),
521                                            p_ptr->publ.ref,
522                                            tipc_own_addr,
523                                            CONN_MANAGER,
524                                            CONN_PROBE,
525                                            TIPC_OK,
526                                            port_out_seqno(p_ptr),
527                                            0);
528                 port_incr_out_seqno(p_ptr);
529                 p_ptr->probing_state = PROBING;
530                 k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
531         }
532         tipc_port_unlock(p_ptr);
533         tipc_net_route_msg(buf);
534 }
535
536
537 static void port_handle_node_down(unsigned long ref)
538 {
539         struct port *p_ptr = tipc_port_lock(ref);
540         struct sk_buff* buf = NULL;
541
542         if (!p_ptr)
543                 return;
544         buf = port_build_self_abort_msg(p_ptr, TIPC_ERR_NO_NODE);
545         tipc_port_unlock(p_ptr);
546         tipc_net_route_msg(buf);
547 }
548
549
550 static struct sk_buff *port_build_self_abort_msg(struct port *p_ptr, u32 err)
551 {
552         u32 imp = msg_importance(&p_ptr->publ.phdr);
553
554         if (!p_ptr->publ.connected)
555                 return NULL;
556         if (imp < TIPC_CRITICAL_IMPORTANCE)
557                 imp++;
558         return port_build_proto_msg(p_ptr->publ.ref,
559                                     tipc_own_addr,
560                                     port_peerport(p_ptr),
561                                     port_peernode(p_ptr),
562                                     imp,
563                                     TIPC_CONN_MSG,
564                                     err,
565                                     p_ptr->last_in_seqno + 1,
566                                     0);
567 }
568
569
570 static struct sk_buff *port_build_peer_abort_msg(struct port *p_ptr, u32 err)
571 {
572         u32 imp = msg_importance(&p_ptr->publ.phdr);
573
574         if (!p_ptr->publ.connected)
575                 return NULL;
576         if (imp < TIPC_CRITICAL_IMPORTANCE)
577                 imp++;
578         return port_build_proto_msg(port_peerport(p_ptr),
579                                     port_peernode(p_ptr),
580                                     p_ptr->publ.ref,
581                                     tipc_own_addr,
582                                     imp,
583                                     TIPC_CONN_MSG,
584                                     err,
585                                     port_out_seqno(p_ptr),
586                                     0);
587 }
588
589 void tipc_port_recv_proto_msg(struct sk_buff *buf)
590 {
591         struct tipc_msg *msg = buf_msg(buf);
592         struct port *p_ptr = tipc_port_lock(msg_destport(msg));
593         u32 err = TIPC_OK;
594         struct sk_buff *r_buf = NULL;
595         struct sk_buff *abort_buf = NULL;
596
597         msg_dbg(msg, "PORT<RECV<:");
598
599         if (!p_ptr) {
600                 err = TIPC_ERR_NO_PORT;
601         } else if (p_ptr->publ.connected) {
602                 if (port_peernode(p_ptr) != msg_orignode(msg))
603                         err = TIPC_ERR_NO_PORT;
604                 if (port_peerport(p_ptr) != msg_origport(msg))
605                         err = TIPC_ERR_NO_PORT;
606                 if (!err && msg_routed(msg)) {
607                         u32 seqno = msg_transp_seqno(msg);
608                         u32 myno =  ++p_ptr->last_in_seqno;
609                         if (seqno != myno) {
610                                 err = TIPC_ERR_NO_PORT;
611                                 abort_buf = port_build_self_abort_msg(p_ptr, err);
612                         }
613                 }
614                 if (msg_type(msg) == CONN_ACK) {
615                         int wakeup = tipc_port_congested(p_ptr) &&
616                                      p_ptr->publ.congested &&
617                                      p_ptr->wakeup;
618                         p_ptr->acked += msg_msgcnt(msg);
619                         if (tipc_port_congested(p_ptr))
620                                 goto exit;
621                         p_ptr->publ.congested = 0;
622                         if (!wakeup)
623                                 goto exit;
624                         p_ptr->wakeup(&p_ptr->publ);
625                         goto exit;
626                 }
627         } else if (p_ptr->publ.published) {
628                 err = TIPC_ERR_NO_PORT;
629         }
630         if (err) {
631                 r_buf = port_build_proto_msg(msg_origport(msg),
632                                              msg_orignode(msg),
633                                              msg_destport(msg),
634                                              tipc_own_addr,
635                                              DATA_HIGH,
636                                              TIPC_CONN_MSG,
637                                              err,
638                                              0,
639                                              0);
640                 goto exit;
641         }
642
643         /* All is fine */
644         if (msg_type(msg) == CONN_PROBE) {
645                 r_buf = port_build_proto_msg(msg_origport(msg),
646                                              msg_orignode(msg),
647                                              msg_destport(msg),
648                                              tipc_own_addr,
649                                              CONN_MANAGER,
650                                              CONN_PROBE_REPLY,
651                                              TIPC_OK,
652                                              port_out_seqno(p_ptr),
653                                              0);
654         }
655         p_ptr->probing_state = CONFIRMED;
656         port_incr_out_seqno(p_ptr);
657 exit:
658         if (p_ptr)
659                 tipc_port_unlock(p_ptr);
660         tipc_net_route_msg(r_buf);
661         tipc_net_route_msg(abort_buf);
662         buf_discard(buf);
663 }
664
665 static void port_print(struct port *p_ptr, struct print_buf *buf, int full_id)
666 {
667         struct publication *publ;
668
669         if (full_id)
670                 tipc_printf(buf, "<%u.%u.%u:%u>:",
671                             tipc_zone(tipc_own_addr), tipc_cluster(tipc_own_addr),
672                             tipc_node(tipc_own_addr), p_ptr->publ.ref);
673         else
674                 tipc_printf(buf, "%-10u:", p_ptr->publ.ref);
675
676         if (p_ptr->publ.connected) {
677                 u32 dport = port_peerport(p_ptr);
678                 u32 destnode = port_peernode(p_ptr);
679
680                 tipc_printf(buf, " connected to <%u.%u.%u:%u>",
681                             tipc_zone(destnode), tipc_cluster(destnode),
682                             tipc_node(destnode), dport);
683                 if (p_ptr->publ.conn_type != 0)
684                         tipc_printf(buf, " via {%u,%u}",
685                                     p_ptr->publ.conn_type,
686                                     p_ptr->publ.conn_instance);
687         }
688         else if (p_ptr->publ.published) {
689                 tipc_printf(buf, " bound to");
690                 list_for_each_entry(publ, &p_ptr->publications, pport_list) {
691                         if (publ->lower == publ->upper)
692                                 tipc_printf(buf, " {%u,%u}", publ->type,
693                                             publ->lower);
694                         else
695                                 tipc_printf(buf, " {%u,%u,%u}", publ->type,
696                                             publ->lower, publ->upper);
697                 }
698         }
699         tipc_printf(buf, "\n");
700 }
701
702 #define MAX_PORT_QUERY 32768
703
704 struct sk_buff *tipc_port_get_ports(void)
705 {
706         struct sk_buff *buf;
707         struct tlv_desc *rep_tlv;
708         struct print_buf pb;
709         struct port *p_ptr;
710         int str_len;
711
712         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_QUERY));
713         if (!buf)
714                 return NULL;
715         rep_tlv = (struct tlv_desc *)buf->data;
716
717         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_QUERY);
718         spin_lock_bh(&tipc_port_list_lock);
719         list_for_each_entry(p_ptr, &ports, port_list) {
720                 spin_lock_bh(p_ptr->publ.lock);
721                 port_print(p_ptr, &pb, 0);
722                 spin_unlock_bh(p_ptr->publ.lock);
723         }
724         spin_unlock_bh(&tipc_port_list_lock);
725         str_len = tipc_printbuf_validate(&pb);
726
727         skb_put(buf, TLV_SPACE(str_len));
728         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
729
730         return buf;
731 }
732
733 #if 0
734
735 #define MAX_PORT_STATS 2000
736
737 struct sk_buff *port_show_stats(const void *req_tlv_area, int req_tlv_space)
738 {
739         u32 ref;
740         struct port *p_ptr;
741         struct sk_buff *buf;
742         struct tlv_desc *rep_tlv;
743         struct print_buf pb;
744         int str_len;
745
746         if (!TLV_CHECK(req_tlv_area, req_tlv_space, TIPC_TLV_PORT_REF))
747                 return cfg_reply_error_string(TIPC_CFG_TLV_ERROR);
748
749         ref = *(u32 *)TLV_DATA(req_tlv_area);
750         ref = ntohl(ref);
751
752         p_ptr = tipc_port_lock(ref);
753         if (!p_ptr)
754                 return cfg_reply_error_string("port not found");
755
756         buf = tipc_cfg_reply_alloc(TLV_SPACE(MAX_PORT_STATS));
757         if (!buf) {
758                 tipc_port_unlock(p_ptr);
759                 return NULL;
760         }
761         rep_tlv = (struct tlv_desc *)buf->data;
762
763         tipc_printbuf_init(&pb, TLV_DATA(rep_tlv), MAX_PORT_STATS);
764         port_print(p_ptr, &pb, 1);
765         /* NEED TO FILL IN ADDITIONAL PORT STATISTICS HERE */
766         tipc_port_unlock(p_ptr);
767         str_len = tipc_printbuf_validate(&pb);
768
769         skb_put(buf, TLV_SPACE(str_len));
770         TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
771
772         return buf;
773 }
774
775 #endif
776
777 void tipc_port_reinit(void)
778 {
779         struct port *p_ptr;
780         struct tipc_msg *msg;
781
782         spin_lock_bh(&tipc_port_list_lock);
783         list_for_each_entry(p_ptr, &ports, port_list) {
784                 msg = &p_ptr->publ.phdr;
785                 if (msg_orignode(msg) == tipc_own_addr)
786                         break;
787                 msg_set_orignode(msg, tipc_own_addr);
788         }
789         spin_unlock_bh(&tipc_port_list_lock);
790 }
791
792
793 /*
794  *  port_dispatcher_sigh(): Signal handler for messages destinated
795  *                          to the tipc_port interface.
796  */
797
798 static void port_dispatcher_sigh(void *dummy)
799 {
800         struct sk_buff *buf;
801
802         spin_lock_bh(&queue_lock);
803         buf = msg_queue_head;
804         msg_queue_head = NULL;
805         spin_unlock_bh(&queue_lock);
806
807         while (buf) {
808                 struct port *p_ptr;
809                 struct user_port *up_ptr;
810                 struct tipc_portid orig;
811                 struct tipc_name_seq dseq;
812                 void *usr_handle;
813                 int connected;
814                 int published;
815                 u32 message_type;
816
817                 struct sk_buff *next = buf->next;
818                 struct tipc_msg *msg = buf_msg(buf);
819                 u32 dref = msg_destport(msg);
820
821                 message_type = msg_type(msg);
822                 if (message_type > TIPC_DIRECT_MSG)
823                         goto reject;    /* Unsupported message type */
824
825                 p_ptr = tipc_port_lock(dref);
826                 if (!p_ptr)
827                         goto reject;    /* Port deleted while msg in queue */
828
829                 orig.ref = msg_origport(msg);
830                 orig.node = msg_orignode(msg);
831                 up_ptr = p_ptr->user_port;
832                 usr_handle = up_ptr->usr_handle;
833                 connected = p_ptr->publ.connected;
834                 published = p_ptr->publ.published;
835
836                 if (unlikely(msg_errcode(msg)))
837                         goto err;
838
839                 switch (message_type) {
840
841                 case TIPC_CONN_MSG:{
842                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
843                                 u32 peer_port = port_peerport(p_ptr);
844                                 u32 peer_node = port_peernode(p_ptr);
845
846                                 spin_unlock_bh(p_ptr->publ.lock);
847                                 if (unlikely(!connected)) {
848                                         if (unlikely(published))
849                                                 goto reject;
850                                         tipc_connect2port(dref,&orig);
851                                 }
852                                 if (unlikely(msg_origport(msg) != peer_port))
853                                         goto reject;
854                                 if (unlikely(msg_orignode(msg) != peer_node))
855                                         goto reject;
856                                 if (unlikely(!cb))
857                                         goto reject;
858                                 if (unlikely(++p_ptr->publ.conn_unacked >=
859                                              TIPC_FLOW_CONTROL_WIN))
860                                         tipc_acknowledge(dref,
861                                                          p_ptr->publ.conn_unacked);
862                                 skb_pull(buf, msg_hdr_sz(msg));
863                                 cb(usr_handle, dref, &buf, msg_data(msg),
864                                    msg_data_sz(msg));
865                                 break;
866                         }
867                 case TIPC_DIRECT_MSG:{
868                                 tipc_msg_event cb = up_ptr->msg_cb;
869
870                                 spin_unlock_bh(p_ptr->publ.lock);
871                                 if (unlikely(connected))
872                                         goto reject;
873                                 if (unlikely(!cb))
874                                         goto reject;
875                                 skb_pull(buf, msg_hdr_sz(msg));
876                                 cb(usr_handle, dref, &buf, msg_data(msg),
877                                    msg_data_sz(msg), msg_importance(msg),
878                                    &orig);
879                                 break;
880                         }
881                 case TIPC_MCAST_MSG:
882                 case TIPC_NAMED_MSG:{
883                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
884
885                                 spin_unlock_bh(p_ptr->publ.lock);
886                                 if (unlikely(connected))
887                                         goto reject;
888                                 if (unlikely(!cb))
889                                         goto reject;
890                                 if (unlikely(!published))
891                                         goto reject;
892                                 dseq.type =  msg_nametype(msg);
893                                 dseq.lower = msg_nameinst(msg);
894                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
895                                         ? dseq.lower : msg_nameupper(msg);
896                                 skb_pull(buf, msg_hdr_sz(msg));
897                                 cb(usr_handle, dref, &buf, msg_data(msg),
898                                    msg_data_sz(msg), msg_importance(msg),
899                                    &orig, &dseq);
900                                 break;
901                         }
902                 }
903                 if (buf)
904                         buf_discard(buf);
905                 buf = next;
906                 continue;
907 err:
908                 switch (message_type) {
909
910                 case TIPC_CONN_MSG:{
911                                 tipc_conn_shutdown_event cb =
912                                         up_ptr->conn_err_cb;
913                                 u32 peer_port = port_peerport(p_ptr);
914                                 u32 peer_node = port_peernode(p_ptr);
915
916                                 spin_unlock_bh(p_ptr->publ.lock);
917                                 if (!connected || !cb)
918                                         break;
919                                 if (msg_origport(msg) != peer_port)
920                                         break;
921                                 if (msg_orignode(msg) != peer_node)
922                                         break;
923                                 tipc_disconnect(dref);
924                                 skb_pull(buf, msg_hdr_sz(msg));
925                                 cb(usr_handle, dref, &buf, msg_data(msg),
926                                    msg_data_sz(msg), msg_errcode(msg));
927                                 break;
928                         }
929                 case TIPC_DIRECT_MSG:{
930                                 tipc_msg_err_event cb = up_ptr->err_cb;
931
932                                 spin_unlock_bh(p_ptr->publ.lock);
933                                 if (connected || !cb)
934                                         break;
935                                 skb_pull(buf, msg_hdr_sz(msg));
936                                 cb(usr_handle, dref, &buf, msg_data(msg),
937                                    msg_data_sz(msg), msg_errcode(msg), &orig);
938                                 break;
939                         }
940                 case TIPC_MCAST_MSG:
941                 case TIPC_NAMED_MSG:{
942                                 tipc_named_msg_err_event cb =
943                                         up_ptr->named_err_cb;
944
945                                 spin_unlock_bh(p_ptr->publ.lock);
946                                 if (connected || !cb)
947                                         break;
948                                 dseq.type =  msg_nametype(msg);
949                                 dseq.lower = msg_nameinst(msg);
950                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
951                                         ? dseq.lower : msg_nameupper(msg);
952                                 skb_pull(buf, msg_hdr_sz(msg));
953                                 cb(usr_handle, dref, &buf, msg_data(msg),
954                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
955                                 break;
956                         }
957                 }
958                 if (buf)
959                         buf_discard(buf);
960                 buf = next;
961                 continue;
962 reject:
963                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
964                 buf = next;
965         }
966 }
967
968 /*
969  *  port_dispatcher(): Dispatcher for messages destinated
970  *  to the tipc_port interface. Called with port locked.
971  */
972
973 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
974 {
975         buf->next = NULL;
976         spin_lock_bh(&queue_lock);
977         if (msg_queue_head) {
978                 msg_queue_tail->next = buf;
979                 msg_queue_tail = buf;
980         } else {
981                 msg_queue_tail = msg_queue_head = buf;
982                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
983         }
984         spin_unlock_bh(&queue_lock);
985         return TIPC_OK;
986 }
987
988 /*
989  * Wake up port after congestion: Called with port locked,
990  *
991  */
992
993 static void port_wakeup_sh(unsigned long ref)
994 {
995         struct port *p_ptr;
996         struct user_port *up_ptr;
997         tipc_continue_event cb = NULL;
998         void *uh = NULL;
999
1000         p_ptr = tipc_port_lock(ref);
1001         if (p_ptr) {
1002                 up_ptr = p_ptr->user_port;
1003                 if (up_ptr) {
1004                         cb = up_ptr->continue_event_cb;
1005                         uh = up_ptr->usr_handle;
1006                 }
1007                 tipc_port_unlock(p_ptr);
1008         }
1009         if (cb)
1010                 cb(uh, ref);
1011 }
1012
1013
1014 static void port_wakeup(struct tipc_port *p_ptr)
1015 {
1016         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1017 }
1018
1019 void tipc_acknowledge(u32 ref, u32 ack)
1020 {
1021         struct port *p_ptr;
1022         struct sk_buff *buf = NULL;
1023
1024         p_ptr = tipc_port_lock(ref);
1025         if (!p_ptr)
1026                 return;
1027         if (p_ptr->publ.connected) {
1028                 p_ptr->publ.conn_unacked -= ack;
1029                 buf = port_build_proto_msg(port_peerport(p_ptr),
1030                                            port_peernode(p_ptr),
1031                                            ref,
1032                                            tipc_own_addr,
1033                                            CONN_MANAGER,
1034                                            CONN_ACK,
1035                                            TIPC_OK,
1036                                            port_out_seqno(p_ptr),
1037                                            ack);
1038         }
1039         tipc_port_unlock(p_ptr);
1040         tipc_net_route_msg(buf);
1041 }
1042
1043 /*
1044  * tipc_createport(): user level call. Will add port to
1045  *                    registry if non-zero user_ref.
1046  */
1047
1048 int tipc_createport(u32 user_ref,
1049                     void *usr_handle,
1050                     unsigned int importance,
1051                     tipc_msg_err_event error_cb,
1052                     tipc_named_msg_err_event named_error_cb,
1053                     tipc_conn_shutdown_event conn_error_cb,
1054                     tipc_msg_event msg_cb,
1055                     tipc_named_msg_event named_msg_cb,
1056                     tipc_conn_msg_event conn_msg_cb,
1057                     tipc_continue_event continue_event_cb,/* May be zero */
1058                     u32 *portref)
1059 {
1060         struct user_port *up_ptr;
1061         struct port *p_ptr;
1062         u32 ref;
1063
1064         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1065         if (!up_ptr) {
1066                 warn("Port creation failed, no memory\n");
1067                 return -ENOMEM;
1068         }
1069         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup, importance);
1070         p_ptr = tipc_port_lock(ref);
1071         if (!p_ptr) {
1072                 kfree(up_ptr);
1073                 return -ENOMEM;
1074         }
1075
1076         p_ptr->user_port = up_ptr;
1077         up_ptr->user_ref = user_ref;
1078         up_ptr->usr_handle = usr_handle;
1079         up_ptr->ref = p_ptr->publ.ref;
1080         up_ptr->err_cb = error_cb;
1081         up_ptr->named_err_cb = named_error_cb;
1082         up_ptr->conn_err_cb = conn_error_cb;
1083         up_ptr->msg_cb = msg_cb;
1084         up_ptr->named_msg_cb = named_msg_cb;
1085         up_ptr->conn_msg_cb = conn_msg_cb;
1086         up_ptr->continue_event_cb = continue_event_cb;
1087         INIT_LIST_HEAD(&up_ptr->uport_list);
1088         tipc_reg_add_port(up_ptr);
1089         *portref = p_ptr->publ.ref;
1090         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1091         tipc_port_unlock(p_ptr);
1092         return TIPC_OK;
1093 }
1094
1095 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1096 {
1097         id->ref = ref;
1098         id->node = tipc_own_addr;
1099         return TIPC_OK;
1100 }
1101
1102 int tipc_portimportance(u32 ref, unsigned int *importance)
1103 {
1104         struct port *p_ptr;
1105
1106         p_ptr = tipc_port_lock(ref);
1107         if (!p_ptr)
1108                 return -EINVAL;
1109         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1110         spin_unlock_bh(p_ptr->publ.lock);
1111         return TIPC_OK;
1112 }
1113
1114 int tipc_set_portimportance(u32 ref, unsigned int imp)
1115 {
1116         struct port *p_ptr;
1117
1118         if (imp > TIPC_CRITICAL_IMPORTANCE)
1119                 return -EINVAL;
1120
1121         p_ptr = tipc_port_lock(ref);
1122         if (!p_ptr)
1123                 return -EINVAL;
1124         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1125         spin_unlock_bh(p_ptr->publ.lock);
1126         return TIPC_OK;
1127 }
1128
1129
1130 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1131 {
1132         struct port *p_ptr;
1133         struct publication *publ;
1134         u32 key;
1135         int res = -EINVAL;
1136
1137         p_ptr = tipc_port_lock(ref);
1138         if (!p_ptr)
1139                 return -EINVAL;
1140
1141         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1142             "lower = %u, upper = %u\n",
1143             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1144         if (p_ptr->publ.connected)
1145                 goto exit;
1146         if (seq->lower > seq->upper)
1147                 goto exit;
1148         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1149                 goto exit;
1150         key = ref + p_ptr->pub_count + 1;
1151         if (key == ref) {
1152                 res = -EADDRINUSE;
1153                 goto exit;
1154         }
1155         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1156                                     scope, p_ptr->publ.ref, key);
1157         if (publ) {
1158                 list_add(&publ->pport_list, &p_ptr->publications);
1159                 p_ptr->pub_count++;
1160                 p_ptr->publ.published = 1;
1161                 res = TIPC_OK;
1162         }
1163 exit:
1164         tipc_port_unlock(p_ptr);
1165         return res;
1166 }
1167
1168 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1169 {
1170         struct port *p_ptr;
1171         struct publication *publ;
1172         struct publication *tpubl;
1173         int res = -EINVAL;
1174
1175         p_ptr = tipc_port_lock(ref);
1176         if (!p_ptr)
1177                 return -EINVAL;
1178         if (!seq) {
1179                 list_for_each_entry_safe(publ, tpubl,
1180                                          &p_ptr->publications, pport_list) {
1181                         tipc_nametbl_withdraw(publ->type, publ->lower,
1182                                               publ->ref, publ->key);
1183                 }
1184                 res = TIPC_OK;
1185         } else {
1186                 list_for_each_entry_safe(publ, tpubl,
1187                                          &p_ptr->publications, pport_list) {
1188                         if (publ->scope != scope)
1189                                 continue;
1190                         if (publ->type != seq->type)
1191                                 continue;
1192                         if (publ->lower != seq->lower)
1193                                 continue;
1194                         if (publ->upper != seq->upper)
1195                                 break;
1196                         tipc_nametbl_withdraw(publ->type, publ->lower,
1197                                               publ->ref, publ->key);
1198                         res = TIPC_OK;
1199                         break;
1200                 }
1201         }
1202         if (list_empty(&p_ptr->publications))
1203                 p_ptr->publ.published = 0;
1204         tipc_port_unlock(p_ptr);
1205         return res;
1206 }
1207
1208 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1209 {
1210         struct port *p_ptr;
1211         struct tipc_msg *msg;
1212         int res = -EINVAL;
1213
1214         p_ptr = tipc_port_lock(ref);
1215         if (!p_ptr)
1216                 return -EINVAL;
1217         if (p_ptr->publ.published || p_ptr->publ.connected)
1218                 goto exit;
1219         if (!peer->ref)
1220                 goto exit;
1221
1222         msg = &p_ptr->publ.phdr;
1223         msg_set_destnode(msg, peer->node);
1224         msg_set_destport(msg, peer->ref);
1225         msg_set_orignode(msg, tipc_own_addr);
1226         msg_set_origport(msg, p_ptr->publ.ref);
1227         msg_set_transp_seqno(msg, 42);
1228         msg_set_type(msg, TIPC_CONN_MSG);
1229         if (!may_route(peer->node))
1230                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1231         else
1232                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1233
1234         p_ptr->probing_interval = PROBING_INTERVAL;
1235         p_ptr->probing_state = CONFIRMED;
1236         p_ptr->publ.connected = 1;
1237         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1238
1239         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1240                           (void *)(unsigned long)ref,
1241                           (net_ev_handler)port_handle_node_down);
1242         res = TIPC_OK;
1243 exit:
1244         tipc_port_unlock(p_ptr);
1245         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1246         return res;
1247 }
1248
1249 /*
1250  * tipc_disconnect(): Disconnect port form peer.
1251  *                    This is a node local operation.
1252  */
1253
1254 int tipc_disconnect(u32 ref)
1255 {
1256         struct port *p_ptr;
1257         int res = -ENOTCONN;
1258
1259         p_ptr = tipc_port_lock(ref);
1260         if (!p_ptr)
1261                 return -EINVAL;
1262         if (p_ptr->publ.connected) {
1263                 p_ptr->publ.connected = 0;
1264                 /* let timer expire on it's own to avoid deadlock! */
1265                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
1266                 res = TIPC_OK;
1267         }
1268         tipc_port_unlock(p_ptr);
1269         return res;
1270 }
1271
1272 /*
1273  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1274  */
1275 int tipc_shutdown(u32 ref)
1276 {
1277         struct port *p_ptr;
1278         struct sk_buff *buf = NULL;
1279
1280         p_ptr = tipc_port_lock(ref);
1281         if (!p_ptr)
1282                 return -EINVAL;
1283
1284         if (p_ptr->publ.connected) {
1285                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1286                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1287                         imp++;
1288                 buf = port_build_proto_msg(port_peerport(p_ptr),
1289                                            port_peernode(p_ptr),
1290                                            ref,
1291                                            tipc_own_addr,
1292                                            imp,
1293                                            TIPC_CONN_MSG,
1294                                            TIPC_CONN_SHUTDOWN,
1295                                            port_out_seqno(p_ptr),
1296                                            0);
1297         }
1298         tipc_port_unlock(p_ptr);
1299         tipc_net_route_msg(buf);
1300         return tipc_disconnect(ref);
1301 }
1302
1303 int tipc_isconnected(u32 ref, int *isconnected)
1304 {
1305         struct port *p_ptr;
1306
1307         p_ptr = tipc_port_lock(ref);
1308         if (!p_ptr)
1309                 return -EINVAL;
1310         *isconnected = p_ptr->publ.connected;
1311         tipc_port_unlock(p_ptr);
1312         return TIPC_OK;
1313 }
1314
1315 int tipc_peer(u32 ref, struct tipc_portid *peer)
1316 {
1317         struct port *p_ptr;
1318         int res;
1319
1320         p_ptr = tipc_port_lock(ref);
1321         if (!p_ptr)
1322                 return -EINVAL;
1323         if (p_ptr->publ.connected) {
1324                 peer->ref = port_peerport(p_ptr);
1325                 peer->node = port_peernode(p_ptr);
1326                 res = TIPC_OK;
1327         } else
1328                 res = -ENOTCONN;
1329         tipc_port_unlock(p_ptr);
1330         return res;
1331 }
1332
1333 int tipc_ref_valid(u32 ref)
1334 {
1335         /* Works irrespective of type */
1336         return !!tipc_ref_deref(ref);
1337 }
1338
1339
1340 /*
1341  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1342  *                        message for this node.
1343  */
1344
1345 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1346                        struct iovec const *msg_sect)
1347 {
1348         struct sk_buff *buf;
1349         int res;
1350
1351         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1352                         MAX_MSG_SIZE, !sender->user_port, &buf);
1353         if (likely(buf))
1354                 tipc_port_recv_msg(buf);
1355         return res;
1356 }
1357
1358 /**
1359  * tipc_send - send message sections on connection
1360  */
1361
1362 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1363 {
1364         struct port *p_ptr;
1365         u32 destnode;
1366         int res;
1367
1368         p_ptr = tipc_port_deref(ref);
1369         if (!p_ptr || !p_ptr->publ.connected)
1370                 return -EINVAL;
1371
1372         p_ptr->publ.congested = 1;
1373         if (!tipc_port_congested(p_ptr)) {
1374                 destnode = port_peernode(p_ptr);
1375                 if (likely(destnode != tipc_own_addr))
1376                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1377                                                            destnode);
1378                 else
1379                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1380
1381                 if (likely(res != -ELINKCONG)) {
1382                         port_incr_out_seqno(p_ptr);
1383                         p_ptr->publ.congested = 0;
1384                         p_ptr->sent++;
1385                         return res;
1386                 }
1387         }
1388         if (port_unreliable(p_ptr)) {
1389                 p_ptr->publ.congested = 0;
1390                 /* Just calculate msg length and return */
1391                 return msg_calc_data_size(msg_sect, num_sect);
1392         }
1393         return -ELINKCONG;
1394 }
1395
1396 /**
1397  * tipc_send_buf - send message buffer on connection
1398  */
1399
1400 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1401 {
1402         struct port *p_ptr;
1403         struct tipc_msg *msg;
1404         u32 destnode;
1405         u32 hsz;
1406         u32 sz;
1407         u32 res;
1408
1409         p_ptr = tipc_port_deref(ref);
1410         if (!p_ptr || !p_ptr->publ.connected)
1411                 return -EINVAL;
1412
1413         msg = &p_ptr->publ.phdr;
1414         hsz = msg_hdr_sz(msg);
1415         sz = hsz + dsz;
1416         msg_set_size(msg, sz);
1417         if (skb_cow(buf, hsz))
1418                 return -ENOMEM;
1419
1420         skb_push(buf, hsz);
1421         skb_copy_to_linear_data(buf, msg, hsz);
1422         destnode = msg_destnode(msg);
1423         p_ptr->publ.congested = 1;
1424         if (!tipc_port_congested(p_ptr)) {
1425                 if (likely(destnode != tipc_own_addr))
1426                         res = tipc_send_buf_fast(buf, destnode);
1427                 else {
1428                         tipc_port_recv_msg(buf);
1429                         res = sz;
1430                 }
1431                 if (likely(res != -ELINKCONG)) {
1432                         port_incr_out_seqno(p_ptr);
1433                         p_ptr->sent++;
1434                         p_ptr->publ.congested = 0;
1435                         return res;
1436                 }
1437         }
1438         if (port_unreliable(p_ptr)) {
1439                 p_ptr->publ.congested = 0;
1440                 return dsz;
1441         }
1442         return -ELINKCONG;
1443 }
1444
1445 /**
1446  * tipc_forward2name - forward message sections to port name
1447  */
1448
1449 int tipc_forward2name(u32 ref,
1450                       struct tipc_name const *name,
1451                       u32 domain,
1452                       u32 num_sect,
1453                       struct iovec const *msg_sect,
1454                       struct tipc_portid const *orig,
1455                       unsigned int importance)
1456 {
1457         struct port *p_ptr;
1458         struct tipc_msg *msg;
1459         u32 destnode = domain;
1460         u32 destport = 0;
1461         int res;
1462
1463         p_ptr = tipc_port_deref(ref);
1464         if (!p_ptr || p_ptr->publ.connected)
1465                 return -EINVAL;
1466
1467         msg = &p_ptr->publ.phdr;
1468         msg_set_type(msg, TIPC_NAMED_MSG);
1469         msg_set_orignode(msg, orig->node);
1470         msg_set_origport(msg, orig->ref);
1471         msg_set_hdr_sz(msg, LONG_H_SIZE);
1472         msg_set_nametype(msg, name->type);
1473         msg_set_nameinst(msg, name->instance);
1474         msg_set_lookup_scope(msg, addr_scope(domain));
1475         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1476                 msg_set_importance(msg,importance);
1477         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1478         msg_set_destnode(msg, destnode);
1479         msg_set_destport(msg, destport);
1480
1481         if (likely(destport || destnode)) {
1482                 p_ptr->sent++;
1483                 if (likely(destnode == tipc_own_addr))
1484                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1485                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1486                                                    destnode);
1487                 if (likely(res != -ELINKCONG))
1488                         return res;
1489                 if (port_unreliable(p_ptr)) {
1490                         /* Just calculate msg length and return */
1491                         return msg_calc_data_size(msg_sect, num_sect);
1492                 }
1493                 return -ELINKCONG;
1494         }
1495         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1496                                          TIPC_ERR_NO_NAME);
1497 }
1498
1499 /**
1500  * tipc_send2name - send message sections to port name
1501  */
1502
1503 int tipc_send2name(u32 ref,
1504                    struct tipc_name const *name,
1505                    unsigned int domain,
1506                    unsigned int num_sect,
1507                    struct iovec const *msg_sect)
1508 {
1509         struct tipc_portid orig;
1510
1511         orig.ref = ref;
1512         orig.node = tipc_own_addr;
1513         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1514                                  TIPC_PORT_IMPORTANCE);
1515 }
1516
1517 /**
1518  * tipc_forward_buf2name - forward message buffer to port name
1519  */
1520
1521 int tipc_forward_buf2name(u32 ref,
1522                           struct tipc_name const *name,
1523                           u32 domain,
1524                           struct sk_buff *buf,
1525                           unsigned int dsz,
1526                           struct tipc_portid const *orig,
1527                           unsigned int importance)
1528 {
1529         struct port *p_ptr;
1530         struct tipc_msg *msg;
1531         u32 destnode = domain;
1532         u32 destport = 0;
1533         int res;
1534
1535         p_ptr = (struct port *)tipc_ref_deref(ref);
1536         if (!p_ptr || p_ptr->publ.connected)
1537                 return -EINVAL;
1538
1539         msg = &p_ptr->publ.phdr;
1540         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1541                 msg_set_importance(msg, importance);
1542         msg_set_type(msg, TIPC_NAMED_MSG);
1543         msg_set_orignode(msg, orig->node);
1544         msg_set_origport(msg, orig->ref);
1545         msg_set_nametype(msg, name->type);
1546         msg_set_nameinst(msg, name->instance);
1547         msg_set_lookup_scope(msg, addr_scope(domain));
1548         msg_set_hdr_sz(msg, LONG_H_SIZE);
1549         msg_set_size(msg, LONG_H_SIZE + dsz);
1550         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1551         msg_set_destnode(msg, destnode);
1552         msg_set_destport(msg, destport);
1553         msg_dbg(msg, "forw2name ==> ");
1554         if (skb_cow(buf, LONG_H_SIZE))
1555                 return -ENOMEM;
1556         skb_push(buf, LONG_H_SIZE);
1557         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1558         msg_dbg(buf_msg(buf),"PREP:");
1559         if (likely(destport || destnode)) {
1560                 p_ptr->sent++;
1561                 if (destnode == tipc_own_addr)
1562                         return tipc_port_recv_msg(buf);
1563                 res = tipc_send_buf_fast(buf, destnode);
1564                 if (likely(res != -ELINKCONG))
1565                         return res;
1566                 if (port_unreliable(p_ptr))
1567                         return dsz;
1568                 return -ELINKCONG;
1569         }
1570         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1571 }
1572
1573 /**
1574  * tipc_send_buf2name - send message buffer to port name
1575  */
1576
1577 int tipc_send_buf2name(u32 ref,
1578                        struct tipc_name const *dest,
1579                        u32 domain,
1580                        struct sk_buff *buf,
1581                        unsigned int dsz)
1582 {
1583         struct tipc_portid orig;
1584
1585         orig.ref = ref;
1586         orig.node = tipc_own_addr;
1587         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1588                                      TIPC_PORT_IMPORTANCE);
1589 }
1590
1591 /**
1592  * tipc_forward2port - forward message sections to port identity
1593  */
1594
1595 int tipc_forward2port(u32 ref,
1596                       struct tipc_portid const *dest,
1597                       unsigned int num_sect,
1598                       struct iovec const *msg_sect,
1599                       struct tipc_portid const *orig,
1600                       unsigned int importance)
1601 {
1602         struct port *p_ptr;
1603         struct tipc_msg *msg;
1604         int res;
1605
1606         p_ptr = tipc_port_deref(ref);
1607         if (!p_ptr || p_ptr->publ.connected)
1608                 return -EINVAL;
1609
1610         msg = &p_ptr->publ.phdr;
1611         msg_set_type(msg, TIPC_DIRECT_MSG);
1612         msg_set_orignode(msg, orig->node);
1613         msg_set_origport(msg, orig->ref);
1614         msg_set_destnode(msg, dest->node);
1615         msg_set_destport(msg, dest->ref);
1616         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1617         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1618                 msg_set_importance(msg, importance);
1619         p_ptr->sent++;
1620         if (dest->node == tipc_own_addr)
1621                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1622         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1623         if (likely(res != -ELINKCONG))
1624                 return res;
1625         if (port_unreliable(p_ptr)) {
1626                 /* Just calculate msg length and return */
1627                 return msg_calc_data_size(msg_sect, num_sect);
1628         }
1629         return -ELINKCONG;
1630 }
1631
1632 /**
1633  * tipc_send2port - send message sections to port identity
1634  */
1635
1636 int tipc_send2port(u32 ref,
1637                    struct tipc_portid const *dest,
1638                    unsigned int num_sect,
1639                    struct iovec const *msg_sect)
1640 {
1641         struct tipc_portid orig;
1642
1643         orig.ref = ref;
1644         orig.node = tipc_own_addr;
1645         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1646                                  TIPC_PORT_IMPORTANCE);
1647 }
1648
1649 /**
1650  * tipc_forward_buf2port - forward message buffer to port identity
1651  */
1652 int tipc_forward_buf2port(u32 ref,
1653                           struct tipc_portid const *dest,
1654                           struct sk_buff *buf,
1655                           unsigned int dsz,
1656                           struct tipc_portid const *orig,
1657                           unsigned int importance)
1658 {
1659         struct port *p_ptr;
1660         struct tipc_msg *msg;
1661         int res;
1662
1663         p_ptr = (struct port *)tipc_ref_deref(ref);
1664         if (!p_ptr || p_ptr->publ.connected)
1665                 return -EINVAL;
1666
1667         msg = &p_ptr->publ.phdr;
1668         msg_set_type(msg, TIPC_DIRECT_MSG);
1669         msg_set_orignode(msg, orig->node);
1670         msg_set_origport(msg, orig->ref);
1671         msg_set_destnode(msg, dest->node);
1672         msg_set_destport(msg, dest->ref);
1673         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1674         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1675                 msg_set_importance(msg, importance);
1676         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1677         if (skb_cow(buf, DIR_MSG_H_SIZE))
1678                 return -ENOMEM;
1679
1680         skb_push(buf, DIR_MSG_H_SIZE);
1681         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1682         msg_dbg(msg, "buf2port: ");
1683         p_ptr->sent++;
1684         if (dest->node == tipc_own_addr)
1685                 return tipc_port_recv_msg(buf);
1686         res = tipc_send_buf_fast(buf, dest->node);
1687         if (likely(res != -ELINKCONG))
1688                 return res;
1689         if (port_unreliable(p_ptr))
1690                 return dsz;
1691         return -ELINKCONG;
1692 }
1693
1694 /**
1695  * tipc_send_buf2port - send message buffer to port identity
1696  */
1697
1698 int tipc_send_buf2port(u32 ref,
1699                        struct tipc_portid const *dest,
1700                        struct sk_buff *buf,
1701                        unsigned int dsz)
1702 {
1703         struct tipc_portid orig;
1704
1705         orig.ref = ref;
1706         orig.node = tipc_own_addr;
1707         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1708                                      TIPC_PORT_IMPORTANCE);
1709 }
1710