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1 /*
2  * net/tipc/port.c: TIPC port code
3  *
4  * Copyright (c) 1992-2007, Ericsson AB
5  * Copyright (c) 2004-2007, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the names of the copyright holders nor the names of its
17  *    contributors may be used to endorse or promote products derived from
18  *    this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34  * POSSIBILITY OF SUCH DAMAGE.
35  */
36
37 #include "core.h"
38 #include "config.h"
39 #include "dbg.h"
40 #include "port.h"
41 #include "addr.h"
42 #include "link.h"
43 #include "node.h"
44 #include "name_table.h"
45 #include "user_reg.h"
46 #include "msg.h"
47 #include "bcast.h"
48
49 /* Connection management: */
50 #define PROBING_INTERVAL 3600000        /* [ms] => 1 h */
51 #define CONFIRMED 0
52 #define PROBING 1
53
54 #define MAX_REJECT_SIZE 1024
55
56 static struct sk_buff *msg_queue_head = NULL;
57 static struct sk_buff *msg_queue_tail = NULL;
58
59 DEFINE_SPINLOCK(tipc_port_list_lock);
60 static DEFINE_SPINLOCK(queue_lock);
61
62 static LIST_HEAD(ports);
63 static void port_handle_node_down(unsigned long ref);
64 static struct sk_buff* port_build_self_abort_msg(struct port *,u32 err);
65 static struct sk_buff* port_build_peer_abort_msg(struct port *,u32 err);
66 static void port_timeout(unsigned long ref);
67
68
69 static u32 port_peernode(struct port *p_ptr)
70 {
71         return msg_destnode(&p_ptr->publ.phdr);
72 }
73
74 static u32 port_peerport(struct port *p_ptr)
75 {
76         return msg_destport(&p_ptr->publ.phdr);
77 }
78
79 static u32 port_out_seqno(struct port *p_ptr)
80 {
81         return msg_transp_seqno(&p_ptr->publ.phdr);
82 }
83
84 static void port_incr_out_seqno(struct port *p_ptr)
85 {
86         struct tipc_msg *m = &p_ptr->publ.phdr;
87
88         if (likely(!msg_routed(m)))
89                 return;
90         msg_set_transp_seqno(m, (msg_transp_seqno(m) + 1));
91 }
92
93 /**
94  * tipc_multicast - send a multicast message to local and remote destinations
95  */
96
97 int tipc_multicast(u32 ref, struct tipc_name_seq const *seq, u32 domain,
98                    u32 num_sect, struct iovec const *msg_sect)
99 {
100         struct tipc_msg *hdr;
101         struct sk_buff *buf;
102         struct sk_buff *ibuf = NULL;
103         struct port_list dports = {0, NULL, };
104         struct port *oport = tipc_port_deref(ref);
105         int ext_targets;
106         int res;
107
108         if (unlikely(!oport))
109                 return -EINVAL;
110
111         /* Create multicast message */
112
113         hdr = &oport->publ.phdr;
114         msg_set_type(hdr, TIPC_MCAST_MSG);
115         msg_set_nametype(hdr, seq->type);
116         msg_set_namelower(hdr, seq->lower);
117         msg_set_nameupper(hdr, seq->upper);
118         msg_set_hdr_sz(hdr, MCAST_H_SIZE);
119         res = msg_build(hdr, msg_sect, num_sect, MAX_MSG_SIZE,
120                         !oport->user_port, &buf);
121         if (unlikely(!buf))
122                 return res;
123
124         /* Figure out where to send multicast message */
125
126         ext_targets = tipc_nametbl_mc_translate(seq->type, seq->lower, seq->upper,
127                                                 TIPC_NODE_SCOPE, &dports);
128
129         /* Send message to destinations (duplicate it only if necessary) */
130
131         if (ext_targets) {
132                 if (dports.count != 0) {
133                         ibuf = skb_copy(buf, GFP_ATOMIC);
134                         if (ibuf == NULL) {
135                                 tipc_port_list_free(&dports);
136                                 buf_discard(buf);
137                                 return -ENOMEM;
138                         }
139                 }
140                 res = tipc_bclink_send_msg(buf);
141                 if ((res < 0) && (dports.count != 0)) {
142                         buf_discard(ibuf);
143                 }
144         } else {
145                 ibuf = buf;
146         }
147
148         if (res >= 0) {
149                 if (ibuf)
150                         tipc_port_recv_mcast(ibuf, &dports);
151         } else {
152                 tipc_port_list_free(&dports);
153         }
154         return res;
155 }
156
157 /**
158  * tipc_port_recv_mcast - deliver multicast message to all destination ports
159  *
160  * If there is no port list, perform a lookup to create one
161  */
162
163 void tipc_port_recv_mcast(struct sk_buff *buf, struct port_list *dp)
164 {
165         struct tipc_msg* msg;
166         struct port_list dports = {0, NULL, };
167         struct port_list *item = dp;
168         int cnt = 0;
169
170         msg = buf_msg(buf);
171
172         /* Create destination port list, if one wasn't supplied */
173
174         if (dp == NULL) {
175                 tipc_nametbl_mc_translate(msg_nametype(msg),
176                                      msg_namelower(msg),
177                                      msg_nameupper(msg),
178                                      TIPC_CLUSTER_SCOPE,
179                                      &dports);
180                 item = dp = &dports;
181         }
182
183         /* Deliver a copy of message to each destination port */
184
185         if (dp->count != 0) {
186                 if (dp->count == 1) {
187                         msg_set_destport(msg, dp->ports[0]);
188                         tipc_port_recv_msg(buf);
189                         tipc_port_list_free(dp);
190                         return;
191                 }
192                 for (; cnt < dp->count; cnt++) {
193                         int index = cnt % PLSIZE;
194                         struct sk_buff *b = skb_clone(buf, GFP_ATOMIC);
195
196                         if (b == NULL) {
197                                 warn("Unable to deliver multicast message(s)\n");
198                                 msg_dbg(msg, "LOST:");
199                                 goto exit;
200                         }
201                         if ((index == 0) && (cnt != 0)) {
202                                 item = item->next;
203                         }
204                         msg_set_destport(buf_msg(b),item->ports[index]);
205                         tipc_port_recv_msg(b);
206                 }
207         }
208 exit:
209         buf_discard(buf);
210         tipc_port_list_free(dp);
211 }
212
213 /**
214  * tipc_createport_raw - create a generic TIPC port
215  *
216  * Returns port reference, or 0 if unable to create it
217  *
218  * Note: The newly created port is returned in the locked state.
219  */
220
221 u32 tipc_createport_raw(void *usr_handle,
222                         u32 (*dispatcher)(struct tipc_port *, struct sk_buff *),
223                         void (*wakeup)(struct tipc_port *),
224                         const u32 importance,
225                         struct tipc_port **tp_ptr)
226 {
227         struct port *p_ptr;
228         struct tipc_msg *msg;
229         u32 ref;
230
231         p_ptr = kzalloc(sizeof(*p_ptr), GFP_ATOMIC);
232         if (!p_ptr) {
233                 warn("Port creation failed, no memory\n");
234                 return 0;
235         }
236         ref = tipc_ref_acquire(p_ptr, &p_ptr->publ.lock);
237         if (!ref) {
238                 warn("Port creation failed, reference table exhausted\n");
239                 kfree(p_ptr);
240                 return 0;
241         }
242
243         p_ptr->publ.usr_handle = usr_handle;
244         p_ptr->publ.max_pkt = MAX_PKT_DEFAULT;
245         p_ptr->publ.ref = ref;
246         msg = &p_ptr->publ.phdr;
247         msg_init(msg, importance, TIPC_NAMED_MSG, LONG_H_SIZE, 0);
248         msg_set_origport(msg, ref);
249         p_ptr->last_in_seqno = 41;
250         p_ptr->sent = 1;
251         INIT_LIST_HEAD(&p_ptr->wait_list);
252         INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list);
253         p_ptr->congested_link = NULL;
254         p_ptr->dispatcher = dispatcher;
255         p_ptr->wakeup = wakeup;
256         p_ptr->user_port = NULL;
257         k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref);
258         spin_lock_bh(&tipc_port_list_lock);
259         INIT_LIST_HEAD(&p_ptr->publications);
260         INIT_LIST_HEAD(&p_ptr->port_list);
261         list_add_tail(&p_ptr->port_list, &ports);
262         spin_unlock_bh(&tipc_port_list_lock);
263         *tp_ptr = &p_ptr->publ;
264         return ref;
265 }
266
267 int tipc_deleteport(u32 ref)
268 {
269         struct port *p_ptr;
270         struct sk_buff *buf = NULL;
271
272         tipc_withdraw(ref, 0, NULL);
273         p_ptr = tipc_port_lock(ref);
274         if (!p_ptr)
275                 return -EINVAL;
276
277         tipc_ref_discard(ref);
278         tipc_port_unlock(p_ptr);
279
280         k_cancel_timer(&p_ptr->timer);
281         if (p_ptr->publ.connected) {
282                 buf = port_build_peer_abort_msg(p_ptr, TIPC_ERR_NO_PORT);
283                 tipc_nodesub_unsubscribe(&p_ptr->subscription);
284         }
285         if (p_ptr->user_port) {
286                 tipc_reg_remove_port(p_ptr->user_port);
287                 kfree(p_ptr->user_port);
288         }
289
290         spin_lock_bh(&tipc_port_list_lock);
291         list_del(&p_ptr->port_list);
292         list_del(&p_ptr->wait_list);
293         spin_unlock_bh(&tipc_port_list_lock);
294         k_term_timer(&p_ptr->timer);
295         kfree(p_ptr);
296         dbg("Deleted port %u\n", ref);
297         tipc_net_route_msg(buf);
298         return TIPC_OK;
299 }
300
301 /**
302  * tipc_get_port() - return port associated with 'ref'
303  *
304  * Note: Port is not locked.
305  */
306
307 struct tipc_port *tipc_get_port(const u32 ref)
308 {
309         return (struct tipc_port *)tipc_ref_deref(ref);
310 }
311
312 /**
313  * tipc_get_handle - return user handle associated to port 'ref'
314  */
315
316 void *tipc_get_handle(const u32 ref)
317 {
318         struct port *p_ptr;
319         void * handle;
320
321         p_ptr = tipc_port_lock(ref);
322         if (!p_ptr)
323                 return NULL;
324         handle = p_ptr->publ.usr_handle;
325         tipc_port_unlock(p_ptr);
326         return handle;
327 }
328
329 static int port_unreliable(struct port *p_ptr)
330 {
331         return msg_src_droppable(&p_ptr->publ.phdr);
332 }
333
334 int tipc_portunreliable(u32 ref, unsigned int *isunreliable)
335 {
336         struct port *p_ptr;
337
338         p_ptr = tipc_port_lock(ref);
339         if (!p_ptr)
340                 return -EINVAL;
341         *isunreliable = port_unreliable(p_ptr);
342         tipc_port_unlock(p_ptr);
343         return TIPC_OK;
344 }
345
346 int tipc_set_portunreliable(u32 ref, unsigned int isunreliable)
347 {
348         struct port *p_ptr;
349
350         p_ptr = tipc_port_lock(ref);
351         if (!p_ptr)
352                 return -EINVAL;
353         msg_set_src_droppable(&p_ptr->publ.phdr, (isunreliable != 0));
354         tipc_port_unlock(p_ptr);
355         return TIPC_OK;
356 }
357
358 static int port_unreturnable(struct port *p_ptr)
359 {
360         return msg_dest_droppable(&p_ptr->publ.phdr);
361 }
362
363 int tipc_portunreturnable(u32 ref, unsigned int *isunrejectable)
364 {
365         struct port *p_ptr;
366
367         p_ptr = tipc_port_lock(ref);
368         if (!p_ptr)
369                 return -EINVAL;
370         *isunrejectable = port_unreturnable(p_ptr);
371         tipc_port_unlock(p_ptr);
372         return TIPC_OK;
373 }
374
375 int tipc_set_portunreturnable(u32 ref, unsigned int isunrejectable)
376 {
377         struct port *p_ptr;
378
379         p_ptr = tipc_port_lock(ref);
380         if (!p_ptr)
381                 return -EINVAL;
382         msg_set_dest_droppable(&p_ptr->publ.phdr, (isunrejectable != 0));
383         tipc_port_unlock(p_ptr);
384         return TIPC_OK;
385 }
386
387 /*
388  * port_build_proto_msg(): build a port level protocol
389  * or a connection abortion message. Called with
390  * tipc_port lock on.
391  */
392 static struct sk_buff *port_build_proto_msg(u32 destport, u32 destnode,
393                                             u32 origport, u32 orignode,
394                                             u32 usr, u32 type, u32 err,
395                                             u32 seqno, u32 ack)
396 {
397         struct sk_buff *buf;
398         struct tipc_msg *msg;
399
400         buf = buf_acquire(LONG_H_SIZE);
401         if (buf) {
402                 msg = buf_msg(buf);
403                 msg_init(msg, usr, type, LONG_H_SIZE, destnode);
404                 msg_set_errcode(msg, err);
405                 msg_set_destport(msg, destport);
406                 msg_set_origport(msg, origport);
407                 msg_set_orignode(msg, orignode);
408                 msg_set_transp_seqno(msg, seqno);
409                 msg_set_msgcnt(msg, ack);
410                 msg_dbg(msg, "PORT>SEND>:");
411         }
412         return buf;
413 }
414
415 int tipc_reject_msg(struct sk_buff *buf, u32 err)
416 {
417         struct tipc_msg *msg = buf_msg(buf);
418         struct sk_buff *rbuf;
419         struct tipc_msg *rmsg;
420         int hdr_sz;
421         u32 imp = msg_importance(msg);
422         u32 data_sz = msg_data_sz(msg);
423
424         if (data_sz > MAX_REJECT_SIZE)
425                 data_sz = MAX_REJECT_SIZE;
426         if (msg_connected(msg) && (imp < TIPC_CRITICAL_IMPORTANCE))
427                 imp++;
428         msg_dbg(msg, "port->rej: ");
429
430         /* discard rejected message if it shouldn't be returned to sender */
431         if (msg_errcode(msg) || msg_dest_droppable(msg)) {
432                 buf_discard(buf);
433                 return data_sz;
434         }
435
436         /* construct rejected message */
437         if (msg_mcast(msg))
438                 hdr_sz = MCAST_H_SIZE;
439         else
440                 hdr_sz = LONG_H_SIZE;
441         rbuf = buf_acquire(data_sz + hdr_sz);
442         if (rbuf == NULL) {
443                 buf_discard(buf);
444                 return data_sz;
445         }
446         rmsg = buf_msg(rbuf);
447         msg_init(rmsg, imp, msg_type(msg), hdr_sz, msg_orignode(msg));
448         msg_set_errcode(rmsg, err);
449         msg_set_destport(rmsg, msg_origport(msg));
450         msg_set_origport(rmsg, msg_destport(msg));
451         if (msg_short(msg)) {
452                 msg_set_orignode(rmsg, tipc_own_addr);
453                 /* leave name type & instance as zeroes */
454         } else {
455                 msg_set_orignode(rmsg, msg_destnode(msg));
456                 msg_set_nametype(rmsg, msg_nametype(msg));
457                 msg_set_nameinst(rmsg, msg_nameinst(msg));
458         }
459         msg_set_size(rmsg, data_sz + hdr_sz);
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_prevnode(msg, tipc_own_addr);
782                 msg_set_orignode(msg, tipc_own_addr);
783         }
784         spin_unlock_bh(&tipc_port_list_lock);
785 }
786
787
788 /*
789  *  port_dispatcher_sigh(): Signal handler for messages destinated
790  *                          to the tipc_port interface.
791  */
792
793 static void port_dispatcher_sigh(void *dummy)
794 {
795         struct sk_buff *buf;
796
797         spin_lock_bh(&queue_lock);
798         buf = msg_queue_head;
799         msg_queue_head = NULL;
800         spin_unlock_bh(&queue_lock);
801
802         while (buf) {
803                 struct port *p_ptr;
804                 struct user_port *up_ptr;
805                 struct tipc_portid orig;
806                 struct tipc_name_seq dseq;
807                 void *usr_handle;
808                 int connected;
809                 int published;
810                 u32 message_type;
811
812                 struct sk_buff *next = buf->next;
813                 struct tipc_msg *msg = buf_msg(buf);
814                 u32 dref = msg_destport(msg);
815
816                 message_type = msg_type(msg);
817                 if (message_type > TIPC_DIRECT_MSG)
818                         goto reject;    /* Unsupported message type */
819
820                 p_ptr = tipc_port_lock(dref);
821                 if (!p_ptr)
822                         goto reject;    /* Port deleted while msg in queue */
823
824                 orig.ref = msg_origport(msg);
825                 orig.node = msg_orignode(msg);
826                 up_ptr = p_ptr->user_port;
827                 usr_handle = up_ptr->usr_handle;
828                 connected = p_ptr->publ.connected;
829                 published = p_ptr->publ.published;
830
831                 if (unlikely(msg_errcode(msg)))
832                         goto err;
833
834                 switch (message_type) {
835
836                 case TIPC_CONN_MSG:{
837                                 tipc_conn_msg_event cb = up_ptr->conn_msg_cb;
838                                 u32 peer_port = port_peerport(p_ptr);
839                                 u32 peer_node = port_peernode(p_ptr);
840
841                                 tipc_port_unlock(p_ptr);
842                                 if (unlikely(!cb))
843                                         goto reject;
844                                 if (unlikely(!connected)) {
845                                         if (tipc_connect2port(dref, &orig))
846                                                 goto reject;
847                                 } else if ((msg_origport(msg) != peer_port) ||
848                                            (msg_orignode(msg) != peer_node))
849                                         goto reject;
850                                 if (unlikely(++p_ptr->publ.conn_unacked >=
851                                              TIPC_FLOW_CONTROL_WIN))
852                                         tipc_acknowledge(dref,
853                                                          p_ptr->publ.conn_unacked);
854                                 skb_pull(buf, msg_hdr_sz(msg));
855                                 cb(usr_handle, dref, &buf, msg_data(msg),
856                                    msg_data_sz(msg));
857                                 break;
858                         }
859                 case TIPC_DIRECT_MSG:{
860                                 tipc_msg_event cb = up_ptr->msg_cb;
861
862                                 tipc_port_unlock(p_ptr);
863                                 if (unlikely(!cb || connected))
864                                         goto reject;
865                                 skb_pull(buf, msg_hdr_sz(msg));
866                                 cb(usr_handle, dref, &buf, msg_data(msg),
867                                    msg_data_sz(msg), msg_importance(msg),
868                                    &orig);
869                                 break;
870                         }
871                 case TIPC_MCAST_MSG:
872                 case TIPC_NAMED_MSG:{
873                                 tipc_named_msg_event cb = up_ptr->named_msg_cb;
874
875                                 tipc_port_unlock(p_ptr);
876                                 if (unlikely(!cb || connected || !published))
877                                         goto reject;
878                                 dseq.type =  msg_nametype(msg);
879                                 dseq.lower = msg_nameinst(msg);
880                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
881                                         ? dseq.lower : msg_nameupper(msg);
882                                 skb_pull(buf, msg_hdr_sz(msg));
883                                 cb(usr_handle, dref, &buf, msg_data(msg),
884                                    msg_data_sz(msg), msg_importance(msg),
885                                    &orig, &dseq);
886                                 break;
887                         }
888                 }
889                 if (buf)
890                         buf_discard(buf);
891                 buf = next;
892                 continue;
893 err:
894                 switch (message_type) {
895
896                 case TIPC_CONN_MSG:{
897                                 tipc_conn_shutdown_event cb =
898                                         up_ptr->conn_err_cb;
899                                 u32 peer_port = port_peerport(p_ptr);
900                                 u32 peer_node = port_peernode(p_ptr);
901
902                                 tipc_port_unlock(p_ptr);
903                                 if (!cb || !connected)
904                                         break;
905                                 if ((msg_origport(msg) != peer_port) ||
906                                     (msg_orignode(msg) != peer_node))
907                                         break;
908                                 tipc_disconnect(dref);
909                                 skb_pull(buf, msg_hdr_sz(msg));
910                                 cb(usr_handle, dref, &buf, msg_data(msg),
911                                    msg_data_sz(msg), msg_errcode(msg));
912                                 break;
913                         }
914                 case TIPC_DIRECT_MSG:{
915                                 tipc_msg_err_event cb = up_ptr->err_cb;
916
917                                 tipc_port_unlock(p_ptr);
918                                 if (!cb || connected)
919                                         break;
920                                 skb_pull(buf, msg_hdr_sz(msg));
921                                 cb(usr_handle, dref, &buf, msg_data(msg),
922                                    msg_data_sz(msg), msg_errcode(msg), &orig);
923                                 break;
924                         }
925                 case TIPC_MCAST_MSG:
926                 case TIPC_NAMED_MSG:{
927                                 tipc_named_msg_err_event cb =
928                                         up_ptr->named_err_cb;
929
930                                 tipc_port_unlock(p_ptr);
931                                 if (!cb || connected)
932                                         break;
933                                 dseq.type =  msg_nametype(msg);
934                                 dseq.lower = msg_nameinst(msg);
935                                 dseq.upper = (message_type == TIPC_NAMED_MSG)
936                                         ? dseq.lower : msg_nameupper(msg);
937                                 skb_pull(buf, msg_hdr_sz(msg));
938                                 cb(usr_handle, dref, &buf, msg_data(msg),
939                                    msg_data_sz(msg), msg_errcode(msg), &dseq);
940                                 break;
941                         }
942                 }
943                 if (buf)
944                         buf_discard(buf);
945                 buf = next;
946                 continue;
947 reject:
948                 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
949                 buf = next;
950         }
951 }
952
953 /*
954  *  port_dispatcher(): Dispatcher for messages destinated
955  *  to the tipc_port interface. Called with port locked.
956  */
957
958 static u32 port_dispatcher(struct tipc_port *dummy, struct sk_buff *buf)
959 {
960         buf->next = NULL;
961         spin_lock_bh(&queue_lock);
962         if (msg_queue_head) {
963                 msg_queue_tail->next = buf;
964                 msg_queue_tail = buf;
965         } else {
966                 msg_queue_tail = msg_queue_head = buf;
967                 tipc_k_signal((Handler)port_dispatcher_sigh, 0);
968         }
969         spin_unlock_bh(&queue_lock);
970         return TIPC_OK;
971 }
972
973 /*
974  * Wake up port after congestion: Called with port locked,
975  *
976  */
977
978 static void port_wakeup_sh(unsigned long ref)
979 {
980         struct port *p_ptr;
981         struct user_port *up_ptr;
982         tipc_continue_event cb = NULL;
983         void *uh = NULL;
984
985         p_ptr = tipc_port_lock(ref);
986         if (p_ptr) {
987                 up_ptr = p_ptr->user_port;
988                 if (up_ptr) {
989                         cb = up_ptr->continue_event_cb;
990                         uh = up_ptr->usr_handle;
991                 }
992                 tipc_port_unlock(p_ptr);
993         }
994         if (cb)
995                 cb(uh, ref);
996 }
997
998
999 static void port_wakeup(struct tipc_port *p_ptr)
1000 {
1001         tipc_k_signal((Handler)port_wakeup_sh, p_ptr->ref);
1002 }
1003
1004 void tipc_acknowledge(u32 ref, u32 ack)
1005 {
1006         struct port *p_ptr;
1007         struct sk_buff *buf = NULL;
1008
1009         p_ptr = tipc_port_lock(ref);
1010         if (!p_ptr)
1011                 return;
1012         if (p_ptr->publ.connected) {
1013                 p_ptr->publ.conn_unacked -= ack;
1014                 buf = port_build_proto_msg(port_peerport(p_ptr),
1015                                            port_peernode(p_ptr),
1016                                            ref,
1017                                            tipc_own_addr,
1018                                            CONN_MANAGER,
1019                                            CONN_ACK,
1020                                            TIPC_OK,
1021                                            port_out_seqno(p_ptr),
1022                                            ack);
1023         }
1024         tipc_port_unlock(p_ptr);
1025         tipc_net_route_msg(buf);
1026 }
1027
1028 /*
1029  * tipc_createport(): user level call. Will add port to
1030  *                    registry if non-zero user_ref.
1031  */
1032
1033 int tipc_createport(u32 user_ref,
1034                     void *usr_handle,
1035                     unsigned int importance,
1036                     tipc_msg_err_event error_cb,
1037                     tipc_named_msg_err_event named_error_cb,
1038                     tipc_conn_shutdown_event conn_error_cb,
1039                     tipc_msg_event msg_cb,
1040                     tipc_named_msg_event named_msg_cb,
1041                     tipc_conn_msg_event conn_msg_cb,
1042                     tipc_continue_event continue_event_cb,/* May be zero */
1043                     u32 *portref)
1044 {
1045         struct user_port *up_ptr;
1046         struct port *p_ptr;
1047         struct tipc_port *tp_ptr;
1048         u32 ref;
1049
1050         up_ptr = kmalloc(sizeof(*up_ptr), GFP_ATOMIC);
1051         if (!up_ptr) {
1052                 warn("Port creation failed, no memory\n");
1053                 return -ENOMEM;
1054         }
1055         ref = tipc_createport_raw(NULL, port_dispatcher, port_wakeup,
1056                                   importance, &tp_ptr);
1057         if (ref == 0) {
1058                 kfree(up_ptr);
1059                 return -ENOMEM;
1060         }
1061         p_ptr = (struct port *)tp_ptr;
1062
1063         p_ptr->user_port = up_ptr;
1064         up_ptr->user_ref = user_ref;
1065         up_ptr->usr_handle = usr_handle;
1066         up_ptr->ref = p_ptr->publ.ref;
1067         up_ptr->err_cb = error_cb;
1068         up_ptr->named_err_cb = named_error_cb;
1069         up_ptr->conn_err_cb = conn_error_cb;
1070         up_ptr->msg_cb = msg_cb;
1071         up_ptr->named_msg_cb = named_msg_cb;
1072         up_ptr->conn_msg_cb = conn_msg_cb;
1073         up_ptr->continue_event_cb = continue_event_cb;
1074         INIT_LIST_HEAD(&up_ptr->uport_list);
1075         tipc_reg_add_port(up_ptr);
1076         *portref = p_ptr->publ.ref;
1077         dbg(" tipc_createport: %x with ref %u\n", p_ptr, p_ptr->publ.ref);
1078         tipc_port_unlock(p_ptr);
1079         return TIPC_OK;
1080 }
1081
1082 int tipc_ownidentity(u32 ref, struct tipc_portid *id)
1083 {
1084         id->ref = ref;
1085         id->node = tipc_own_addr;
1086         return TIPC_OK;
1087 }
1088
1089 int tipc_portimportance(u32 ref, unsigned int *importance)
1090 {
1091         struct port *p_ptr;
1092
1093         p_ptr = tipc_port_lock(ref);
1094         if (!p_ptr)
1095                 return -EINVAL;
1096         *importance = (unsigned int)msg_importance(&p_ptr->publ.phdr);
1097         tipc_port_unlock(p_ptr);
1098         return TIPC_OK;
1099 }
1100
1101 int tipc_set_portimportance(u32 ref, unsigned int imp)
1102 {
1103         struct port *p_ptr;
1104
1105         if (imp > TIPC_CRITICAL_IMPORTANCE)
1106                 return -EINVAL;
1107
1108         p_ptr = tipc_port_lock(ref);
1109         if (!p_ptr)
1110                 return -EINVAL;
1111         msg_set_importance(&p_ptr->publ.phdr, (u32)imp);
1112         tipc_port_unlock(p_ptr);
1113         return TIPC_OK;
1114 }
1115
1116
1117 int tipc_publish(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1118 {
1119         struct port *p_ptr;
1120         struct publication *publ;
1121         u32 key;
1122         int res = -EINVAL;
1123
1124         p_ptr = tipc_port_lock(ref);
1125         if (!p_ptr)
1126                 return -EINVAL;
1127
1128         dbg("tipc_publ %u, p_ptr = %x, conn = %x, scope = %x, "
1129             "lower = %u, upper = %u\n",
1130             ref, p_ptr, p_ptr->publ.connected, scope, seq->lower, seq->upper);
1131         if (p_ptr->publ.connected)
1132                 goto exit;
1133         if (seq->lower > seq->upper)
1134                 goto exit;
1135         if ((scope < TIPC_ZONE_SCOPE) || (scope > TIPC_NODE_SCOPE))
1136                 goto exit;
1137         key = ref + p_ptr->pub_count + 1;
1138         if (key == ref) {
1139                 res = -EADDRINUSE;
1140                 goto exit;
1141         }
1142         publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
1143                                     scope, p_ptr->publ.ref, key);
1144         if (publ) {
1145                 list_add(&publ->pport_list, &p_ptr->publications);
1146                 p_ptr->pub_count++;
1147                 p_ptr->publ.published = 1;
1148                 res = TIPC_OK;
1149         }
1150 exit:
1151         tipc_port_unlock(p_ptr);
1152         return res;
1153 }
1154
1155 int tipc_withdraw(u32 ref, unsigned int scope, struct tipc_name_seq const *seq)
1156 {
1157         struct port *p_ptr;
1158         struct publication *publ;
1159         struct publication *tpubl;
1160         int res = -EINVAL;
1161
1162         p_ptr = tipc_port_lock(ref);
1163         if (!p_ptr)
1164                 return -EINVAL;
1165         if (!seq) {
1166                 list_for_each_entry_safe(publ, tpubl,
1167                                          &p_ptr->publications, pport_list) {
1168                         tipc_nametbl_withdraw(publ->type, publ->lower,
1169                                               publ->ref, publ->key);
1170                 }
1171                 res = TIPC_OK;
1172         } else {
1173                 list_for_each_entry_safe(publ, tpubl,
1174                                          &p_ptr->publications, pport_list) {
1175                         if (publ->scope != scope)
1176                                 continue;
1177                         if (publ->type != seq->type)
1178                                 continue;
1179                         if (publ->lower != seq->lower)
1180                                 continue;
1181                         if (publ->upper != seq->upper)
1182                                 break;
1183                         tipc_nametbl_withdraw(publ->type, publ->lower,
1184                                               publ->ref, publ->key);
1185                         res = TIPC_OK;
1186                         break;
1187                 }
1188         }
1189         if (list_empty(&p_ptr->publications))
1190                 p_ptr->publ.published = 0;
1191         tipc_port_unlock(p_ptr);
1192         return res;
1193 }
1194
1195 int tipc_connect2port(u32 ref, struct tipc_portid const *peer)
1196 {
1197         struct port *p_ptr;
1198         struct tipc_msg *msg;
1199         int res = -EINVAL;
1200
1201         p_ptr = tipc_port_lock(ref);
1202         if (!p_ptr)
1203                 return -EINVAL;
1204         if (p_ptr->publ.published || p_ptr->publ.connected)
1205                 goto exit;
1206         if (!peer->ref)
1207                 goto exit;
1208
1209         msg = &p_ptr->publ.phdr;
1210         msg_set_destnode(msg, peer->node);
1211         msg_set_destport(msg, peer->ref);
1212         msg_set_orignode(msg, tipc_own_addr);
1213         msg_set_origport(msg, p_ptr->publ.ref);
1214         msg_set_transp_seqno(msg, 42);
1215         msg_set_type(msg, TIPC_CONN_MSG);
1216         if (!may_route(peer->node))
1217                 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1218         else
1219                 msg_set_hdr_sz(msg, LONG_H_SIZE);
1220
1221         p_ptr->probing_interval = PROBING_INTERVAL;
1222         p_ptr->probing_state = CONFIRMED;
1223         p_ptr->publ.connected = 1;
1224         k_start_timer(&p_ptr->timer, p_ptr->probing_interval);
1225
1226         tipc_nodesub_subscribe(&p_ptr->subscription,peer->node,
1227                           (void *)(unsigned long)ref,
1228                           (net_ev_handler)port_handle_node_down);
1229         res = TIPC_OK;
1230 exit:
1231         tipc_port_unlock(p_ptr);
1232         p_ptr->publ.max_pkt = tipc_link_get_max_pkt(peer->node, ref);
1233         return res;
1234 }
1235
1236 /**
1237  * tipc_disconnect_port - disconnect port from peer
1238  *
1239  * Port must be locked.
1240  */
1241
1242 int tipc_disconnect_port(struct tipc_port *tp_ptr)
1243 {
1244         int res;
1245
1246         if (tp_ptr->connected) {
1247                 tp_ptr->connected = 0;
1248                 /* let timer expire on it's own to avoid deadlock! */
1249                 tipc_nodesub_unsubscribe(
1250                         &((struct port *)tp_ptr)->subscription);
1251                 res = TIPC_OK;
1252         } else {
1253                 res = -ENOTCONN;
1254         }
1255         return res;
1256 }
1257
1258 /*
1259  * tipc_disconnect(): Disconnect port form peer.
1260  *                    This is a node local operation.
1261  */
1262
1263 int tipc_disconnect(u32 ref)
1264 {
1265         struct port *p_ptr;
1266         int res;
1267
1268         p_ptr = tipc_port_lock(ref);
1269         if (!p_ptr)
1270                 return -EINVAL;
1271         res = tipc_disconnect_port((struct tipc_port *)p_ptr);
1272         tipc_port_unlock(p_ptr);
1273         return res;
1274 }
1275
1276 /*
1277  * tipc_shutdown(): Send a SHUTDOWN msg to peer and disconnect
1278  */
1279 int tipc_shutdown(u32 ref)
1280 {
1281         struct port *p_ptr;
1282         struct sk_buff *buf = NULL;
1283
1284         p_ptr = tipc_port_lock(ref);
1285         if (!p_ptr)
1286                 return -EINVAL;
1287
1288         if (p_ptr->publ.connected) {
1289                 u32 imp = msg_importance(&p_ptr->publ.phdr);
1290                 if (imp < TIPC_CRITICAL_IMPORTANCE)
1291                         imp++;
1292                 buf = port_build_proto_msg(port_peerport(p_ptr),
1293                                            port_peernode(p_ptr),
1294                                            ref,
1295                                            tipc_own_addr,
1296                                            imp,
1297                                            TIPC_CONN_MSG,
1298                                            TIPC_CONN_SHUTDOWN,
1299                                            port_out_seqno(p_ptr),
1300                                            0);
1301         }
1302         tipc_port_unlock(p_ptr);
1303         tipc_net_route_msg(buf);
1304         return tipc_disconnect(ref);
1305 }
1306
1307 int tipc_isconnected(u32 ref, int *isconnected)
1308 {
1309         struct port *p_ptr;
1310
1311         p_ptr = tipc_port_lock(ref);
1312         if (!p_ptr)
1313                 return -EINVAL;
1314         *isconnected = p_ptr->publ.connected;
1315         tipc_port_unlock(p_ptr);
1316         return TIPC_OK;
1317 }
1318
1319 int tipc_peer(u32 ref, struct tipc_portid *peer)
1320 {
1321         struct port *p_ptr;
1322         int res;
1323
1324         p_ptr = tipc_port_lock(ref);
1325         if (!p_ptr)
1326                 return -EINVAL;
1327         if (p_ptr->publ.connected) {
1328                 peer->ref = port_peerport(p_ptr);
1329                 peer->node = port_peernode(p_ptr);
1330                 res = TIPC_OK;
1331         } else
1332                 res = -ENOTCONN;
1333         tipc_port_unlock(p_ptr);
1334         return res;
1335 }
1336
1337 int tipc_ref_valid(u32 ref)
1338 {
1339         /* Works irrespective of type */
1340         return !!tipc_ref_deref(ref);
1341 }
1342
1343
1344 /*
1345  *  tipc_port_recv_sections(): Concatenate and deliver sectioned
1346  *                        message for this node.
1347  */
1348
1349 int tipc_port_recv_sections(struct port *sender, unsigned int num_sect,
1350                        struct iovec const *msg_sect)
1351 {
1352         struct sk_buff *buf;
1353         int res;
1354
1355         res = msg_build(&sender->publ.phdr, msg_sect, num_sect,
1356                         MAX_MSG_SIZE, !sender->user_port, &buf);
1357         if (likely(buf))
1358                 tipc_port_recv_msg(buf);
1359         return res;
1360 }
1361
1362 /**
1363  * tipc_send - send message sections on connection
1364  */
1365
1366 int tipc_send(u32 ref, unsigned int num_sect, struct iovec const *msg_sect)
1367 {
1368         struct port *p_ptr;
1369         u32 destnode;
1370         int res;
1371
1372         p_ptr = tipc_port_deref(ref);
1373         if (!p_ptr || !p_ptr->publ.connected)
1374                 return -EINVAL;
1375
1376         p_ptr->publ.congested = 1;
1377         if (!tipc_port_congested(p_ptr)) {
1378                 destnode = port_peernode(p_ptr);
1379                 if (likely(destnode != tipc_own_addr))
1380                         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1381                                                            destnode);
1382                 else
1383                         res = tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1384
1385                 if (likely(res != -ELINKCONG)) {
1386                         port_incr_out_seqno(p_ptr);
1387                         p_ptr->publ.congested = 0;
1388                         p_ptr->sent++;
1389                         return res;
1390                 }
1391         }
1392         if (port_unreliable(p_ptr)) {
1393                 p_ptr->publ.congested = 0;
1394                 /* Just calculate msg length and return */
1395                 return msg_calc_data_size(msg_sect, num_sect);
1396         }
1397         return -ELINKCONG;
1398 }
1399
1400 /**
1401  * tipc_send_buf - send message buffer on connection
1402  */
1403
1404 int tipc_send_buf(u32 ref, struct sk_buff *buf, unsigned int dsz)
1405 {
1406         struct port *p_ptr;
1407         struct tipc_msg *msg;
1408         u32 destnode;
1409         u32 hsz;
1410         u32 sz;
1411         u32 res;
1412
1413         p_ptr = tipc_port_deref(ref);
1414         if (!p_ptr || !p_ptr->publ.connected)
1415                 return -EINVAL;
1416
1417         msg = &p_ptr->publ.phdr;
1418         hsz = msg_hdr_sz(msg);
1419         sz = hsz + dsz;
1420         msg_set_size(msg, sz);
1421         if (skb_cow(buf, hsz))
1422                 return -ENOMEM;
1423
1424         skb_push(buf, hsz);
1425         skb_copy_to_linear_data(buf, msg, hsz);
1426         destnode = msg_destnode(msg);
1427         p_ptr->publ.congested = 1;
1428         if (!tipc_port_congested(p_ptr)) {
1429                 if (likely(destnode != tipc_own_addr))
1430                         res = tipc_send_buf_fast(buf, destnode);
1431                 else {
1432                         tipc_port_recv_msg(buf);
1433                         res = sz;
1434                 }
1435                 if (likely(res != -ELINKCONG)) {
1436                         port_incr_out_seqno(p_ptr);
1437                         p_ptr->sent++;
1438                         p_ptr->publ.congested = 0;
1439                         return res;
1440                 }
1441         }
1442         if (port_unreliable(p_ptr)) {
1443                 p_ptr->publ.congested = 0;
1444                 return dsz;
1445         }
1446         return -ELINKCONG;
1447 }
1448
1449 /**
1450  * tipc_forward2name - forward message sections to port name
1451  */
1452
1453 int tipc_forward2name(u32 ref,
1454                       struct tipc_name const *name,
1455                       u32 domain,
1456                       u32 num_sect,
1457                       struct iovec const *msg_sect,
1458                       struct tipc_portid const *orig,
1459                       unsigned int importance)
1460 {
1461         struct port *p_ptr;
1462         struct tipc_msg *msg;
1463         u32 destnode = domain;
1464         u32 destport = 0;
1465         int res;
1466
1467         p_ptr = tipc_port_deref(ref);
1468         if (!p_ptr || p_ptr->publ.connected)
1469                 return -EINVAL;
1470
1471         msg = &p_ptr->publ.phdr;
1472         msg_set_type(msg, TIPC_NAMED_MSG);
1473         msg_set_orignode(msg, orig->node);
1474         msg_set_origport(msg, orig->ref);
1475         msg_set_hdr_sz(msg, LONG_H_SIZE);
1476         msg_set_nametype(msg, name->type);
1477         msg_set_nameinst(msg, name->instance);
1478         msg_set_lookup_scope(msg, addr_scope(domain));
1479         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1480                 msg_set_importance(msg,importance);
1481         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1482         msg_set_destnode(msg, destnode);
1483         msg_set_destport(msg, destport);
1484
1485         if (likely(destport || destnode)) {
1486                 p_ptr->sent++;
1487                 if (likely(destnode == tipc_own_addr))
1488                         return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1489                 res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect,
1490                                                    destnode);
1491                 if (likely(res != -ELINKCONG))
1492                         return res;
1493                 if (port_unreliable(p_ptr)) {
1494                         /* Just calculate msg length and return */
1495                         return msg_calc_data_size(msg_sect, num_sect);
1496                 }
1497                 return -ELINKCONG;
1498         }
1499         return tipc_port_reject_sections(p_ptr, msg, msg_sect, num_sect,
1500                                          TIPC_ERR_NO_NAME);
1501 }
1502
1503 /**
1504  * tipc_send2name - send message sections to port name
1505  */
1506
1507 int tipc_send2name(u32 ref,
1508                    struct tipc_name const *name,
1509                    unsigned int domain,
1510                    unsigned int num_sect,
1511                    struct iovec const *msg_sect)
1512 {
1513         struct tipc_portid orig;
1514
1515         orig.ref = ref;
1516         orig.node = tipc_own_addr;
1517         return tipc_forward2name(ref, name, domain, num_sect, msg_sect, &orig,
1518                                  TIPC_PORT_IMPORTANCE);
1519 }
1520
1521 /**
1522  * tipc_forward_buf2name - forward message buffer to port name
1523  */
1524
1525 int tipc_forward_buf2name(u32 ref,
1526                           struct tipc_name const *name,
1527                           u32 domain,
1528                           struct sk_buff *buf,
1529                           unsigned int dsz,
1530                           struct tipc_portid const *orig,
1531                           unsigned int importance)
1532 {
1533         struct port *p_ptr;
1534         struct tipc_msg *msg;
1535         u32 destnode = domain;
1536         u32 destport = 0;
1537         int res;
1538
1539         p_ptr = (struct port *)tipc_ref_deref(ref);
1540         if (!p_ptr || p_ptr->publ.connected)
1541                 return -EINVAL;
1542
1543         msg = &p_ptr->publ.phdr;
1544         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1545                 msg_set_importance(msg, importance);
1546         msg_set_type(msg, TIPC_NAMED_MSG);
1547         msg_set_orignode(msg, orig->node);
1548         msg_set_origport(msg, orig->ref);
1549         msg_set_nametype(msg, name->type);
1550         msg_set_nameinst(msg, name->instance);
1551         msg_set_lookup_scope(msg, addr_scope(domain));
1552         msg_set_hdr_sz(msg, LONG_H_SIZE);
1553         msg_set_size(msg, LONG_H_SIZE + dsz);
1554         destport = tipc_nametbl_translate(name->type, name->instance, &destnode);
1555         msg_set_destnode(msg, destnode);
1556         msg_set_destport(msg, destport);
1557         msg_dbg(msg, "forw2name ==> ");
1558         if (skb_cow(buf, LONG_H_SIZE))
1559                 return -ENOMEM;
1560         skb_push(buf, LONG_H_SIZE);
1561         skb_copy_to_linear_data(buf, msg, LONG_H_SIZE);
1562         msg_dbg(buf_msg(buf),"PREP:");
1563         if (likely(destport || destnode)) {
1564                 p_ptr->sent++;
1565                 if (destnode == tipc_own_addr)
1566                         return tipc_port_recv_msg(buf);
1567                 res = tipc_send_buf_fast(buf, destnode);
1568                 if (likely(res != -ELINKCONG))
1569                         return res;
1570                 if (port_unreliable(p_ptr))
1571                         return dsz;
1572                 return -ELINKCONG;
1573         }
1574         return tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
1575 }
1576
1577 /**
1578  * tipc_send_buf2name - send message buffer to port name
1579  */
1580
1581 int tipc_send_buf2name(u32 ref,
1582                        struct tipc_name const *dest,
1583                        u32 domain,
1584                        struct sk_buff *buf,
1585                        unsigned int dsz)
1586 {
1587         struct tipc_portid orig;
1588
1589         orig.ref = ref;
1590         orig.node = tipc_own_addr;
1591         return tipc_forward_buf2name(ref, dest, domain, buf, dsz, &orig,
1592                                      TIPC_PORT_IMPORTANCE);
1593 }
1594
1595 /**
1596  * tipc_forward2port - forward message sections to port identity
1597  */
1598
1599 int tipc_forward2port(u32 ref,
1600                       struct tipc_portid const *dest,
1601                       unsigned int num_sect,
1602                       struct iovec const *msg_sect,
1603                       struct tipc_portid const *orig,
1604                       unsigned int importance)
1605 {
1606         struct port *p_ptr;
1607         struct tipc_msg *msg;
1608         int res;
1609
1610         p_ptr = tipc_port_deref(ref);
1611         if (!p_ptr || p_ptr->publ.connected)
1612                 return -EINVAL;
1613
1614         msg = &p_ptr->publ.phdr;
1615         msg_set_type(msg, TIPC_DIRECT_MSG);
1616         msg_set_orignode(msg, orig->node);
1617         msg_set_origport(msg, orig->ref);
1618         msg_set_destnode(msg, dest->node);
1619         msg_set_destport(msg, dest->ref);
1620         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1621         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1622                 msg_set_importance(msg, importance);
1623         p_ptr->sent++;
1624         if (dest->node == tipc_own_addr)
1625                 return tipc_port_recv_sections(p_ptr, num_sect, msg_sect);
1626         res = tipc_link_send_sections_fast(p_ptr, msg_sect, num_sect, dest->node);
1627         if (likely(res != -ELINKCONG))
1628                 return res;
1629         if (port_unreliable(p_ptr)) {
1630                 /* Just calculate msg length and return */
1631                 return msg_calc_data_size(msg_sect, num_sect);
1632         }
1633         return -ELINKCONG;
1634 }
1635
1636 /**
1637  * tipc_send2port - send message sections to port identity
1638  */
1639
1640 int tipc_send2port(u32 ref,
1641                    struct tipc_portid const *dest,
1642                    unsigned int num_sect,
1643                    struct iovec const *msg_sect)
1644 {
1645         struct tipc_portid orig;
1646
1647         orig.ref = ref;
1648         orig.node = tipc_own_addr;
1649         return tipc_forward2port(ref, dest, num_sect, msg_sect, &orig,
1650                                  TIPC_PORT_IMPORTANCE);
1651 }
1652
1653 /**
1654  * tipc_forward_buf2port - forward message buffer to port identity
1655  */
1656 int tipc_forward_buf2port(u32 ref,
1657                           struct tipc_portid const *dest,
1658                           struct sk_buff *buf,
1659                           unsigned int dsz,
1660                           struct tipc_portid const *orig,
1661                           unsigned int importance)
1662 {
1663         struct port *p_ptr;
1664         struct tipc_msg *msg;
1665         int res;
1666
1667         p_ptr = (struct port *)tipc_ref_deref(ref);
1668         if (!p_ptr || p_ptr->publ.connected)
1669                 return -EINVAL;
1670
1671         msg = &p_ptr->publ.phdr;
1672         msg_set_type(msg, TIPC_DIRECT_MSG);
1673         msg_set_orignode(msg, orig->node);
1674         msg_set_origport(msg, orig->ref);
1675         msg_set_destnode(msg, dest->node);
1676         msg_set_destport(msg, dest->ref);
1677         msg_set_hdr_sz(msg, DIR_MSG_H_SIZE);
1678         if (importance <= TIPC_CRITICAL_IMPORTANCE)
1679                 msg_set_importance(msg, importance);
1680         msg_set_size(msg, DIR_MSG_H_SIZE + dsz);
1681         if (skb_cow(buf, DIR_MSG_H_SIZE))
1682                 return -ENOMEM;
1683
1684         skb_push(buf, DIR_MSG_H_SIZE);
1685         skb_copy_to_linear_data(buf, msg, DIR_MSG_H_SIZE);
1686         msg_dbg(msg, "buf2port: ");
1687         p_ptr->sent++;
1688         if (dest->node == tipc_own_addr)
1689                 return tipc_port_recv_msg(buf);
1690         res = tipc_send_buf_fast(buf, dest->node);
1691         if (likely(res != -ELINKCONG))
1692                 return res;
1693         if (port_unreliable(p_ptr))
1694                 return dsz;
1695         return -ELINKCONG;
1696 }
1697
1698 /**
1699  * tipc_send_buf2port - send message buffer to port identity
1700  */
1701
1702 int tipc_send_buf2port(u32 ref,
1703                        struct tipc_portid const *dest,
1704                        struct sk_buff *buf,
1705                        unsigned int dsz)
1706 {
1707         struct tipc_portid orig;
1708
1709         orig.ref = ref;
1710         orig.node = tipc_own_addr;
1711         return tipc_forward_buf2port(ref, dest, buf, dsz, &orig,
1712                                      TIPC_PORT_IMPORTANCE);
1713 }
1714