xref: /openbmc/linux/net/tipc/msg.h (revision 588b48ca) 
1 /*
2  * net/tipc/msg.h: Include file for TIPC message header routines
3  *
4  * Copyright (c) 2000-2007, 2014, Ericsson AB
5  * Copyright (c) 2005-2008, 2010-2011, 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 #ifndef _TIPC_MSG_H
38 #define _TIPC_MSG_H
39 
40 #include "bearer.h"
41 
42 /*
43  * Constants and routines used to read and write TIPC payload message headers
44  *
45  * Note: Some items are also used with TIPC internal message headers
46  */
47 #define TIPC_VERSION              2
48 
49 /*
50  * Payload message users are defined in TIPC's public API:
51  * - TIPC_LOW_IMPORTANCE
52  * - TIPC_MEDIUM_IMPORTANCE
53  * - TIPC_HIGH_IMPORTANCE
54  * - TIPC_CRITICAL_IMPORTANCE
55  */
56 
57 /*
58  * Payload message types
59  */
60 #define TIPC_CONN_MSG		0
61 #define TIPC_MCAST_MSG		1
62 #define TIPC_NAMED_MSG		2
63 #define TIPC_DIRECT_MSG		3
64 
65 /*
66  * Message header sizes
67  */
68 #define SHORT_H_SIZE              24	/* In-cluster basic payload message */
69 #define BASIC_H_SIZE              32	/* Basic payload message */
70 #define NAMED_H_SIZE              40	/* Named payload message */
71 #define MCAST_H_SIZE              44	/* Multicast payload message */
72 #define INT_H_SIZE                40	/* Internal messages */
73 #define MIN_H_SIZE                24	/* Smallest legal TIPC header size */
74 #define MAX_H_SIZE                60	/* Largest possible TIPC header size */
75 
76 #define MAX_MSG_SIZE (MAX_H_SIZE + TIPC_MAX_USER_MSG_SIZE)
77 
78 #define TIPC_MEDIA_ADDR_OFFSET	5
79 
80 
81 struct tipc_msg {
82 	__be32 hdr[15];
83 };
84 
85 
86 static inline u32 msg_word(struct tipc_msg *m, u32 pos)
87 {
88 	return ntohl(m->hdr[pos]);
89 }
90 
91 static inline void msg_set_word(struct tipc_msg *m, u32 w, u32 val)
92 {
93 	m->hdr[w] = htonl(val);
94 }
95 
96 static inline u32 msg_bits(struct tipc_msg *m, u32 w, u32 pos, u32 mask)
97 {
98 	return (msg_word(m, w) >> pos) & mask;
99 }
100 
101 static inline void msg_set_bits(struct tipc_msg *m, u32 w,
102 				u32 pos, u32 mask, u32 val)
103 {
104 	val = (val & mask) << pos;
105 	mask = mask << pos;
106 	m->hdr[w] &= ~htonl(mask);
107 	m->hdr[w] |= htonl(val);
108 }
109 
110 static inline void msg_swap_words(struct tipc_msg *msg, u32 a, u32 b)
111 {
112 	u32 temp = msg->hdr[a];
113 
114 	msg->hdr[a] = msg->hdr[b];
115 	msg->hdr[b] = temp;
116 }
117 
118 /*
119  * Word 0
120  */
121 static inline u32 msg_version(struct tipc_msg *m)
122 {
123 	return msg_bits(m, 0, 29, 7);
124 }
125 
126 static inline void msg_set_version(struct tipc_msg *m)
127 {
128 	msg_set_bits(m, 0, 29, 7, TIPC_VERSION);
129 }
130 
131 static inline u32 msg_user(struct tipc_msg *m)
132 {
133 	return msg_bits(m, 0, 25, 0xf);
134 }
135 
136 static inline u32 msg_isdata(struct tipc_msg *m)
137 {
138 	return msg_user(m) <= TIPC_CRITICAL_IMPORTANCE;
139 }
140 
141 static inline void msg_set_user(struct tipc_msg *m, u32 n)
142 {
143 	msg_set_bits(m, 0, 25, 0xf, n);
144 }
145 
146 static inline u32 msg_importance(struct tipc_msg *m)
147 {
148 	return msg_bits(m, 0, 25, 0xf);
149 }
150 
151 static inline void msg_set_importance(struct tipc_msg *m, u32 i)
152 {
153 	msg_set_user(m, i);
154 }
155 
156 static inline u32 msg_hdr_sz(struct tipc_msg *m)
157 {
158 	return msg_bits(m, 0, 21, 0xf) << 2;
159 }
160 
161 static inline void msg_set_hdr_sz(struct tipc_msg *m, u32 n)
162 {
163 	msg_set_bits(m, 0, 21, 0xf, n>>2);
164 }
165 
166 static inline u32 msg_size(struct tipc_msg *m)
167 {
168 	return msg_bits(m, 0, 0, 0x1ffff);
169 }
170 
171 static inline u32 msg_data_sz(struct tipc_msg *m)
172 {
173 	return msg_size(m) - msg_hdr_sz(m);
174 }
175 
176 static inline int msg_non_seq(struct tipc_msg *m)
177 {
178 	return msg_bits(m, 0, 20, 1);
179 }
180 
181 static inline void msg_set_non_seq(struct tipc_msg *m, u32 n)
182 {
183 	msg_set_bits(m, 0, 20, 1, n);
184 }
185 
186 static inline int msg_dest_droppable(struct tipc_msg *m)
187 {
188 	return msg_bits(m, 0, 19, 1);
189 }
190 
191 static inline void msg_set_dest_droppable(struct tipc_msg *m, u32 d)
192 {
193 	msg_set_bits(m, 0, 19, 1, d);
194 }
195 
196 static inline int msg_src_droppable(struct tipc_msg *m)
197 {
198 	return msg_bits(m, 0, 18, 1);
199 }
200 
201 static inline void msg_set_src_droppable(struct tipc_msg *m, u32 d)
202 {
203 	msg_set_bits(m, 0, 18, 1, d);
204 }
205 
206 static inline void msg_set_size(struct tipc_msg *m, u32 sz)
207 {
208 	m->hdr[0] = htonl((msg_word(m, 0) & ~0x1ffff) | sz);
209 }
210 
211 
212 /*
213  * Word 1
214  */
215 static inline u32 msg_type(struct tipc_msg *m)
216 {
217 	return msg_bits(m, 1, 29, 0x7);
218 }
219 
220 static inline void msg_set_type(struct tipc_msg *m, u32 n)
221 {
222 	msg_set_bits(m, 1, 29, 0x7, n);
223 }
224 
225 static inline u32 msg_named(struct tipc_msg *m)
226 {
227 	return msg_type(m) == TIPC_NAMED_MSG;
228 }
229 
230 static inline u32 msg_mcast(struct tipc_msg *m)
231 {
232 	return msg_type(m) == TIPC_MCAST_MSG;
233 }
234 
235 static inline u32 msg_connected(struct tipc_msg *m)
236 {
237 	return msg_type(m) == TIPC_CONN_MSG;
238 }
239 
240 static inline u32 msg_errcode(struct tipc_msg *m)
241 {
242 	return msg_bits(m, 1, 25, 0xf);
243 }
244 
245 static inline void msg_set_errcode(struct tipc_msg *m, u32 err)
246 {
247 	msg_set_bits(m, 1, 25, 0xf, err);
248 }
249 
250 static inline u32 msg_reroute_cnt(struct tipc_msg *m)
251 {
252 	return msg_bits(m, 1, 21, 0xf);
253 }
254 
255 static inline void msg_incr_reroute_cnt(struct tipc_msg *m)
256 {
257 	msg_set_bits(m, 1, 21, 0xf, msg_reroute_cnt(m) + 1);
258 }
259 
260 static inline void msg_reset_reroute_cnt(struct tipc_msg *m)
261 {
262 	msg_set_bits(m, 1, 21, 0xf, 0);
263 }
264 
265 static inline u32 msg_lookup_scope(struct tipc_msg *m)
266 {
267 	return msg_bits(m, 1, 19, 0x3);
268 }
269 
270 static inline void msg_set_lookup_scope(struct tipc_msg *m, u32 n)
271 {
272 	msg_set_bits(m, 1, 19, 0x3, n);
273 }
274 
275 static inline u32 msg_bcast_ack(struct tipc_msg *m)
276 {
277 	return msg_bits(m, 1, 0, 0xffff);
278 }
279 
280 static inline void msg_set_bcast_ack(struct tipc_msg *m, u32 n)
281 {
282 	msg_set_bits(m, 1, 0, 0xffff, n);
283 }
284 
285 
286 /*
287  * Word 2
288  */
289 static inline u32 msg_ack(struct tipc_msg *m)
290 {
291 	return msg_bits(m, 2, 16, 0xffff);
292 }
293 
294 static inline void msg_set_ack(struct tipc_msg *m, u32 n)
295 {
296 	msg_set_bits(m, 2, 16, 0xffff, n);
297 }
298 
299 static inline u32 msg_seqno(struct tipc_msg *m)
300 {
301 	return msg_bits(m, 2, 0, 0xffff);
302 }
303 
304 static inline void msg_set_seqno(struct tipc_msg *m, u32 n)
305 {
306 	msg_set_bits(m, 2, 0, 0xffff, n);
307 }
308 
309 /*
310  * Words 3-10
311  */
312 static inline u32 msg_prevnode(struct tipc_msg *m)
313 {
314 	return msg_word(m, 3);
315 }
316 
317 static inline void msg_set_prevnode(struct tipc_msg *m, u32 a)
318 {
319 	msg_set_word(m, 3, a);
320 }
321 
322 static inline u32 msg_origport(struct tipc_msg *m)
323 {
324 	return msg_word(m, 4);
325 }
326 
327 static inline void msg_set_origport(struct tipc_msg *m, u32 p)
328 {
329 	msg_set_word(m, 4, p);
330 }
331 
332 static inline u32 msg_destport(struct tipc_msg *m)
333 {
334 	return msg_word(m, 5);
335 }
336 
337 static inline void msg_set_destport(struct tipc_msg *m, u32 p)
338 {
339 	msg_set_word(m, 5, p);
340 }
341 
342 static inline u32 msg_mc_netid(struct tipc_msg *m)
343 {
344 	return msg_word(m, 5);
345 }
346 
347 static inline void msg_set_mc_netid(struct tipc_msg *m, u32 p)
348 {
349 	msg_set_word(m, 5, p);
350 }
351 
352 static inline int msg_short(struct tipc_msg *m)
353 {
354 	return msg_hdr_sz(m) == SHORT_H_SIZE;
355 }
356 
357 static inline u32 msg_orignode(struct tipc_msg *m)
358 {
359 	if (likely(msg_short(m)))
360 		return msg_prevnode(m);
361 	return msg_word(m, 6);
362 }
363 
364 static inline void msg_set_orignode(struct tipc_msg *m, u32 a)
365 {
366 	msg_set_word(m, 6, a);
367 }
368 
369 static inline u32 msg_destnode(struct tipc_msg *m)
370 {
371 	return msg_word(m, 7);
372 }
373 
374 static inline void msg_set_destnode(struct tipc_msg *m, u32 a)
375 {
376 	msg_set_word(m, 7, a);
377 }
378 
379 static inline u32 msg_nametype(struct tipc_msg *m)
380 {
381 	return msg_word(m, 8);
382 }
383 
384 static inline void msg_set_nametype(struct tipc_msg *m, u32 n)
385 {
386 	msg_set_word(m, 8, n);
387 }
388 
389 static inline u32 msg_nameinst(struct tipc_msg *m)
390 {
391 	return msg_word(m, 9);
392 }
393 
394 static inline u32 msg_namelower(struct tipc_msg *m)
395 {
396 	return msg_nameinst(m);
397 }
398 
399 static inline void msg_set_namelower(struct tipc_msg *m, u32 n)
400 {
401 	msg_set_word(m, 9, n);
402 }
403 
404 static inline void msg_set_nameinst(struct tipc_msg *m, u32 n)
405 {
406 	msg_set_namelower(m, n);
407 }
408 
409 static inline u32 msg_nameupper(struct tipc_msg *m)
410 {
411 	return msg_word(m, 10);
412 }
413 
414 static inline void msg_set_nameupper(struct tipc_msg *m, u32 n)
415 {
416 	msg_set_word(m, 10, n);
417 }
418 
419 static inline unchar *msg_data(struct tipc_msg *m)
420 {
421 	return ((unchar *)m) + msg_hdr_sz(m);
422 }
423 
424 static inline struct tipc_msg *msg_get_wrapped(struct tipc_msg *m)
425 {
426 	return (struct tipc_msg *)msg_data(m);
427 }
428 
429 /*
430  * Constants and routines used to read and write TIPC internal message headers
431  */
432 
433 /*
434  * Internal message users
435  */
436 #define  BCAST_PROTOCOL       5
437 #define  MSG_BUNDLER          6
438 #define  LINK_PROTOCOL        7
439 #define  CONN_MANAGER         8
440 #define  ROUTE_DISTRIBUTOR    9		/* obsoleted */
441 #define  CHANGEOVER_PROTOCOL  10
442 #define  NAME_DISTRIBUTOR     11
443 #define  MSG_FRAGMENTER       12
444 #define  LINK_CONFIG          13
445 
446 /*
447  *  Connection management protocol message types
448  */
449 #define CONN_PROBE        0
450 #define CONN_PROBE_REPLY  1
451 #define CONN_ACK          2
452 
453 /*
454  * Name distributor message types
455  */
456 #define PUBLICATION       0
457 #define WITHDRAWAL        1
458 
459 /*
460  * Segmentation message types
461  */
462 #define FIRST_FRAGMENT		0
463 #define FRAGMENT		1
464 #define LAST_FRAGMENT		2
465 
466 /* Bundling protocol message types
467  */
468 #define BUNDLE_OPEN             0
469 #define BUNDLE_CLOSED           1
470 
471 /*
472  * Link management protocol message types
473  */
474 #define STATE_MSG		0
475 #define RESET_MSG		1
476 #define ACTIVATE_MSG		2
477 
478 /*
479  * Changeover tunnel message types
480  */
481 #define DUPLICATE_MSG		0
482 #define ORIGINAL_MSG		1
483 
484 /*
485  * Config protocol message types
486  */
487 #define DSC_REQ_MSG		0
488 #define DSC_RESP_MSG		1
489 
490 
491 /*
492  * Word 1
493  */
494 static inline u32 msg_seq_gap(struct tipc_msg *m)
495 {
496 	return msg_bits(m, 1, 16, 0x1fff);
497 }
498 
499 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
500 {
501 	msg_set_bits(m, 1, 16, 0x1fff, n);
502 }
503 
504 static inline u32 msg_node_sig(struct tipc_msg *m)
505 {
506 	return msg_bits(m, 1, 0, 0xffff);
507 }
508 
509 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
510 {
511 	msg_set_bits(m, 1, 0, 0xffff, n);
512 }
513 
514 
515 /*
516  * Word 2
517  */
518 static inline u32 msg_dest_domain(struct tipc_msg *m)
519 {
520 	return msg_word(m, 2);
521 }
522 
523 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
524 {
525 	msg_set_word(m, 2, n);
526 }
527 
528 static inline u32 msg_bcgap_after(struct tipc_msg *m)
529 {
530 	return msg_bits(m, 2, 16, 0xffff);
531 }
532 
533 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
534 {
535 	msg_set_bits(m, 2, 16, 0xffff, n);
536 }
537 
538 static inline u32 msg_bcgap_to(struct tipc_msg *m)
539 {
540 	return msg_bits(m, 2, 0, 0xffff);
541 }
542 
543 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
544 {
545 	msg_set_bits(m, 2, 0, 0xffff, n);
546 }
547 
548 
549 /*
550  * Word 4
551  */
552 static inline u32 msg_last_bcast(struct tipc_msg *m)
553 {
554 	return msg_bits(m, 4, 16, 0xffff);
555 }
556 
557 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
558 {
559 	msg_set_bits(m, 4, 16, 0xffff, n);
560 }
561 
562 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
563 {
564 	msg_set_bits(m, 4, 16, 0xffff, n);
565 }
566 
567 
568 static inline u32 msg_next_sent(struct tipc_msg *m)
569 {
570 	return msg_bits(m, 4, 0, 0xffff);
571 }
572 
573 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
574 {
575 	msg_set_bits(m, 4, 0, 0xffff, n);
576 }
577 
578 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
579 {
580 	msg_set_bits(m, 4, 0, 0xffff, n);
581 }
582 
583 static inline u32 msg_bc_netid(struct tipc_msg *m)
584 {
585 	return msg_word(m, 4);
586 }
587 
588 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
589 {
590 	msg_set_word(m, 4, id);
591 }
592 
593 static inline u32 msg_link_selector(struct tipc_msg *m)
594 {
595 	return msg_bits(m, 4, 0, 1);
596 }
597 
598 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
599 {
600 	msg_set_bits(m, 4, 0, 1, n);
601 }
602 
603 /*
604  * Word 5
605  */
606 static inline u32 msg_session(struct tipc_msg *m)
607 {
608 	return msg_bits(m, 5, 16, 0xffff);
609 }
610 
611 static inline void msg_set_session(struct tipc_msg *m, u32 n)
612 {
613 	msg_set_bits(m, 5, 16, 0xffff, n);
614 }
615 
616 static inline u32 msg_probe(struct tipc_msg *m)
617 {
618 	return msg_bits(m, 5, 0, 1);
619 }
620 
621 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
622 {
623 	msg_set_bits(m, 5, 0, 1, val);
624 }
625 
626 static inline char msg_net_plane(struct tipc_msg *m)
627 {
628 	return msg_bits(m, 5, 1, 7) + 'A';
629 }
630 
631 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
632 {
633 	msg_set_bits(m, 5, 1, 7, (n - 'A'));
634 }
635 
636 static inline u32 msg_linkprio(struct tipc_msg *m)
637 {
638 	return msg_bits(m, 5, 4, 0x1f);
639 }
640 
641 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
642 {
643 	msg_set_bits(m, 5, 4, 0x1f, n);
644 }
645 
646 static inline u32 msg_bearer_id(struct tipc_msg *m)
647 {
648 	return msg_bits(m, 5, 9, 0x7);
649 }
650 
651 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
652 {
653 	msg_set_bits(m, 5, 9, 0x7, n);
654 }
655 
656 static inline u32 msg_redundant_link(struct tipc_msg *m)
657 {
658 	return msg_bits(m, 5, 12, 0x1);
659 }
660 
661 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
662 {
663 	msg_set_bits(m, 5, 12, 0x1, r);
664 }
665 
666 static inline char *msg_media_addr(struct tipc_msg *m)
667 {
668 	return (char *)&m->hdr[TIPC_MEDIA_ADDR_OFFSET];
669 }
670 
671 /*
672  * Word 9
673  */
674 static inline u32 msg_msgcnt(struct tipc_msg *m)
675 {
676 	return msg_bits(m, 9, 16, 0xffff);
677 }
678 
679 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
680 {
681 	msg_set_bits(m, 9, 16, 0xffff, n);
682 }
683 
684 static inline u32 msg_bcast_tag(struct tipc_msg *m)
685 {
686 	return msg_bits(m, 9, 16, 0xffff);
687 }
688 
689 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
690 {
691 	msg_set_bits(m, 9, 16, 0xffff, n);
692 }
693 
694 static inline u32 msg_max_pkt(struct tipc_msg *m)
695 {
696 	return msg_bits(m, 9, 16, 0xffff) * 4;
697 }
698 
699 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
700 {
701 	msg_set_bits(m, 9, 16, 0xffff, (n / 4));
702 }
703 
704 static inline u32 msg_link_tolerance(struct tipc_msg *m)
705 {
706 	return msg_bits(m, 9, 0, 0xffff);
707 }
708 
709 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
710 {
711 	msg_set_bits(m, 9, 0, 0xffff, n);
712 }
713 
714 static inline u32 tipc_msg_tot_importance(struct tipc_msg *m)
715 {
716 	if ((msg_user(m) == MSG_FRAGMENTER) && (msg_type(m) == FIRST_FRAGMENT))
717 		return msg_importance(msg_get_wrapped(m));
718 	return msg_importance(m);
719 }
720 
721 static inline u32 msg_tot_origport(struct tipc_msg *m)
722 {
723 	if ((msg_user(m) == MSG_FRAGMENTER) && (msg_type(m) == FIRST_FRAGMENT))
724 		return msg_origport(msg_get_wrapped(m));
725 	return msg_origport(m);
726 }
727 
728 bool tipc_msg_reverse(struct sk_buff *buf, u32 *dnode, int err);
729 
730 int tipc_msg_eval(struct sk_buff *buf, u32 *dnode);
731 
732 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize,
733 		   u32 destnode);
734 
735 int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf);
736 
737 bool tipc_msg_bundle(struct sk_buff *bbuf, struct sk_buff *buf, u32 mtu);
738 
739 bool tipc_msg_make_bundle(struct sk_buff **buf, u32 mtu, u32 dnode);
740 
741 int tipc_msg_build(struct tipc_msg *mhdr, struct iovec const *iov,
742 		   int offset, int dsz, int mtu , struct sk_buff **chain);
743 
744 struct sk_buff *tipc_msg_reassemble(struct sk_buff *chain);
745 
746 #endif
747