net/tipc/msg.h

   1 /*
   2  * net/tipc/msg.h: Include file for TIPC message header routines
   3  *
   4  * Copyright (c) 2000-2007, 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 /*
 467  * Link management protocol message types
 468  */
 469 #define STATE_MSG               0
 470 #define RESET_MSG               1
 471 #define ACTIVATE_MSG            2
 472
 473 /*
 474  * Changeover tunnel message types
 475  */
 476 #define DUPLICATE_MSG           0
 477 #define ORIGINAL_MSG            1
 478
 479 /*
 480  * Config protocol message types
 481  */
 482 #define DSC_REQ_MSG             0
 483 #define DSC_RESP_MSG            1
 484
 485
 486 /*
 487  * Word 1
 488  */
 489 static inline u32 msg_seq_gap(struct tipc_msg *m)
 490 {
 491         return msg_bits(m, 1, 16, 0x1fff);
 492 }
 493
 494 static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 495 {
 496         msg_set_bits(m, 1, 16, 0x1fff, n);
 497 }
 498
 499 static inline u32 msg_node_sig(struct tipc_msg *m)
 500 {
 501         return msg_bits(m, 1, 0, 0xffff);
 502 }
 503
 504 static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
 505 {
 506         msg_set_bits(m, 1, 0, 0xffff, n);
 507 }
 508
 509
 510 /*
 511  * Word 2
 512  */
 513 static inline u32 msg_dest_domain(struct tipc_msg *m)
 514 {
 515         return msg_word(m, 2);
 516 }
 517
 518 static inline void msg_set_dest_domain(struct tipc_msg *m, u32 n)
 519 {
 520         msg_set_word(m, 2, n);
 521 }
 522
 523 static inline u32 msg_bcgap_after(struct tipc_msg *m)
 524 {
 525         return msg_bits(m, 2, 16, 0xffff);
 526 }
 527
 528 static inline void msg_set_bcgap_after(struct tipc_msg *m, u32 n)
 529 {
 530         msg_set_bits(m, 2, 16, 0xffff, n);
 531 }
 532
 533 static inline u32 msg_bcgap_to(struct tipc_msg *m)
 534 {
 535         return msg_bits(m, 2, 0, 0xffff);
 536 }
 537
 538 static inline void msg_set_bcgap_to(struct tipc_msg *m, u32 n)
 539 {
 540         msg_set_bits(m, 2, 0, 0xffff, n);
 541 }
 542
 543
 544 /*
 545  * Word 4
 546  */
 547 static inline u32 msg_last_bcast(struct tipc_msg *m)
 548 {
 549         return msg_bits(m, 4, 16, 0xffff);
 550 }
 551
 552 static inline void msg_set_last_bcast(struct tipc_msg *m, u32 n)
 553 {
 554         msg_set_bits(m, 4, 16, 0xffff, n);
 555 }
 556
 557
 558 static inline u32 msg_fragm_no(struct tipc_msg *m)
 559 {
 560         return msg_bits(m, 4, 16, 0xffff);
 561 }
 562
 563 static inline void msg_set_fragm_no(struct tipc_msg *m, u32 n)
 564 {
 565         msg_set_bits(m, 4, 16, 0xffff, n);
 566 }
 567
 568
 569 static inline u32 msg_next_sent(struct tipc_msg *m)
 570 {
 571         return msg_bits(m, 4, 0, 0xffff);
 572 }
 573
 574 static inline void msg_set_next_sent(struct tipc_msg *m, u32 n)
 575 {
 576         msg_set_bits(m, 4, 0, 0xffff, n);
 577 }
 578
 579
 580 static inline u32 msg_long_msgno(struct tipc_msg *m)
 581 {
 582         return msg_bits(m, 4, 0, 0xffff);
 583 }
 584
 585 static inline void msg_set_long_msgno(struct tipc_msg *m, u32 n)
 586 {
 587         msg_set_bits(m, 4, 0, 0xffff, n);
 588 }
 589
 590 static inline u32 msg_bc_netid(struct tipc_msg *m)
 591 {
 592         return msg_word(m, 4);
 593 }
 594
 595 static inline void msg_set_bc_netid(struct tipc_msg *m, u32 id)
 596 {
 597         msg_set_word(m, 4, id);
 598 }
 599
 600 static inline u32 msg_link_selector(struct tipc_msg *m)
 601 {
 602         return msg_bits(m, 4, 0, 1);
 603 }
 604
 605 static inline void msg_set_link_selector(struct tipc_msg *m, u32 n)
 606 {
 607         msg_set_bits(m, 4, 0, 1, n);
 608 }
 609
 610 /*
 611  * Word 5
 612  */
 613 static inline u32 msg_session(struct tipc_msg *m)
 614 {
 615         return msg_bits(m, 5, 16, 0xffff);
 616 }
 617
 618 static inline void msg_set_session(struct tipc_msg *m, u32 n)
 619 {
 620         msg_set_bits(m, 5, 16, 0xffff, n);
 621 }
 622
 623 static inline u32 msg_probe(struct tipc_msg *m)
 624 {
 625         return msg_bits(m, 5, 0, 1);
 626 }
 627
 628 static inline void msg_set_probe(struct tipc_msg *m, u32 val)
 629 {
 630         msg_set_bits(m, 5, 0, 1, val);
 631 }
 632
 633 static inline char msg_net_plane(struct tipc_msg *m)
 634 {
 635         return msg_bits(m, 5, 1, 7) + 'A';
 636 }
 637
 638 static inline void msg_set_net_plane(struct tipc_msg *m, char n)
 639 {
 640         msg_set_bits(m, 5, 1, 7, (n - 'A'));
 641 }
 642
 643 static inline u32 msg_linkprio(struct tipc_msg *m)
 644 {
 645         return msg_bits(m, 5, 4, 0x1f);
 646 }
 647
 648 static inline void msg_set_linkprio(struct tipc_msg *m, u32 n)
 649 {
 650         msg_set_bits(m, 5, 4, 0x1f, n);
 651 }
 652
 653 static inline u32 msg_bearer_id(struct tipc_msg *m)
 654 {
 655         return msg_bits(m, 5, 9, 0x7);
 656 }
 657
 658 static inline void msg_set_bearer_id(struct tipc_msg *m, u32 n)
 659 {
 660         msg_set_bits(m, 5, 9, 0x7, n);
 661 }
 662
 663 static inline u32 msg_redundant_link(struct tipc_msg *m)
 664 {
 665         return msg_bits(m, 5, 12, 0x1);
 666 }
 667
 668 static inline void msg_set_redundant_link(struct tipc_msg *m, u32 r)
 669 {
 670         msg_set_bits(m, 5, 12, 0x1, r);
 671 }
 672
 673 static inline char *msg_media_addr(struct tipc_msg *m)
 674 {
 675         return (char *)&m->hdr[TIPC_MEDIA_ADDR_OFFSET];
 676 }
 677
 678 /*
 679  * Word 9
 680  */
 681 static inline u32 msg_msgcnt(struct tipc_msg *m)
 682 {
 683         return msg_bits(m, 9, 16, 0xffff);
 684 }
 685
 686 static inline void msg_set_msgcnt(struct tipc_msg *m, u32 n)
 687 {
 688         msg_set_bits(m, 9, 16, 0xffff, n);
 689 }
 690
 691 static inline u32 msg_bcast_tag(struct tipc_msg *m)
 692 {
 693         return msg_bits(m, 9, 16, 0xffff);
 694 }
 695
 696 static inline void msg_set_bcast_tag(struct tipc_msg *m, u32 n)
 697 {
 698         msg_set_bits(m, 9, 16, 0xffff, n);
 699 }
 700
 701 static inline u32 msg_max_pkt(struct tipc_msg *m)
 702 {
 703         return msg_bits(m, 9, 16, 0xffff) * 4;
 704 }
 705
 706 static inline void msg_set_max_pkt(struct tipc_msg *m, u32 n)
 707 {
 708         msg_set_bits(m, 9, 16, 0xffff, (n / 4));
 709 }
 710
 711 static inline u32 msg_link_tolerance(struct tipc_msg *m)
 712 {
 713         return msg_bits(m, 9, 0, 0xffff);
 714 }
 715
 716 static inline void msg_set_link_tolerance(struct tipc_msg *m, u32 n)
 717 {
 718         msg_set_bits(m, 9, 0, 0xffff, n);
 719 }
 720
 721 u32 tipc_msg_tot_importance(struct tipc_msg *m);
 722 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
 723                             u32 hsize, u32 destnode);
 724 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
 725                    u32 num_sect, unsigned int total_len,
 726                             int max_size, int usrmem, struct sk_buff **buf);
 727 #endif