sys/boot/pc32/libi386/pxe.c

   1 /*-
   2  * Copyright (c) 2000 Alfred Perlstein <alfred@freebsd.org>
   3  * Copyright (c) 2000 Paul Saab <ps@freebsd.org>
   4  * Copyright (c) 2000 John Baldwin <jhb@freebsd.org>
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/boot/i386/libi386/pxe.c,v 1.20 2003/08/25 23:28:31 obrien Exp $
  29  * $DragonFly: src/sys/boot/pc32/libi386/pxe.c,v 1.8 2005/12/10 00:39:48 swildner Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <stand.h>
  34 #include <string.h>
  35 #include <stdarg.h>
  36
  37 #include <netinet/in_systm.h>
  38 #include <netinet/in.h>
  39 #include <netinet/udp.h>
  40
  41 #include <net.h>
  42 #include <netif.h>
  43 #include <nfsv2.h>
  44 #include <iodesc.h>
  45
  46 #include <bootp.h>
  47 #include <bootstrap.h>
  48 #include "btxv86.h"
  49 #include "pxe.h"
  50
  51 /*
  52  * Allocate the PXE buffers statically instead of sticking grimy fingers into
  53  * BTX's private data area.  The scratch buffer is used to send information to
  54  * the PXE BIOS, and the data buffer is used to receive data from the PXE BIOS.
  55  */
  56 #define PXE_BUFFER_SIZE         0x2000
  57 #define PXE_TFTP_BUFFER_SIZE    512
  58 static char     scratch_buffer[PXE_BUFFER_SIZE];
  59 static char     data_buffer[PXE_BUFFER_SIZE];
  60
  61 static pxenv_t  *pxenv_p = NULL;        /* PXENV+ */
  62 static pxe_t    *pxe_p   = NULL;        /* !PXE */
  63 static BOOTPLAYER       bootplayer;     /* PXE Cached information. */
  64
  65 static int      pxe_debug = 0;
  66 static int      pxe_sock = -1;
  67 static int      pxe_opens = 0;
  68
  69 void            pxe_enable(void *pxeinfo);
  70 static void     (*pxe_call)(int func);
  71 static void     pxenv_call(int func);
  72 static void     bangpxe_call(int func);
  73
  74 static int      pxe_init(void);
  75 static int      pxe_strategy(void *devdata, int flag, daddr_t dblk,
  76                              size_t size, char *buf, size_t *rsize);
  77 static int      pxe_open(struct open_file *f, ...);
  78 static int      pxe_close(struct open_file *f);
  79 static void     pxe_print(int verbose);
  80 static void     pxe_cleanup(void);
  81 static void     pxe_setnfshandle(char *rootpath);
  82
  83 static void     pxe_perror(int error);
  84 static int      pxe_netif_match(struct netif *nif, void *machdep_hint);
  85 static int      pxe_netif_probe(struct netif *nif, void *machdep_hint);
  86 static void     pxe_netif_init(struct iodesc *desc, void *machdep_hint);
  87 static int      pxe_netif_get(struct iodesc *desc, void *pkt, size_t len,
  88                               time_t timeout);
  89 static int      pxe_netif_put(struct iodesc *desc, void *pkt, size_t len);
  90 static void     pxe_netif_end(struct netif *nif);
  91
  92 extern struct netif_stats       pxe_st[];
  93 extern u_int16_t                __bangpxeseg;
  94 extern u_int16_t                __bangpxeoff;
  95 extern void                     __bangpxeentry(void);
  96 extern u_int16_t                __pxenvseg;
  97 extern u_int16_t                __pxenvoff;
  98 extern void                     __pxenventry(void);
  99
 100 struct netif_dif pxe_ifs[] = {
 101 /*      dif_unit        dif_nsel        dif_stats       dif_private     */
 102         {0,             1,              &pxe_st[0],     0}
 103 };
 104
 105 struct netif_stats pxe_st[NENTS(pxe_ifs)];
 106
 107 struct netif_driver pxenetif = {
 108         "pxenet",
 109         pxe_netif_match,
 110         pxe_netif_probe,
 111         pxe_netif_init,
 112         pxe_netif_get,
 113         pxe_netif_put,
 114         pxe_netif_end,
 115         pxe_ifs,
 116         NENTS(pxe_ifs)
 117 };
 118
 119 struct netif_driver *netif_drivers[] = {
 120         &pxenetif,
 121         NULL
 122 };
 123
 124 struct devsw pxedisk = {
 125         "pxe",
 126         DEVT_NET,
 127         pxe_init,
 128         pxe_strategy,
 129         pxe_open,
 130         pxe_close,
 131         noioctl,
 132         pxe_print,
 133         pxe_cleanup
 134 };
 135
 136 /*
 137  * This function is called by the loader to enable PXE support if we
 138  * are booted by PXE.  The passed in pointer is a pointer to the
 139  * PXENV+ structure.
 140  */
 141 void
 142 pxe_enable(void *pxeinfo)
 143 {
 144         pxenv_p  = (pxenv_t *)pxeinfo;
 145         pxe_p    = (pxe_t *)PTOV(pxenv_p->PXEPtr.segment * 16 +
 146                                  pxenv_p->PXEPtr.offset);
 147         pxe_call = NULL;
 148 }
 149
 150 /*
 151  * return true if pxe structures are found/initialized,
 152  * also figures out our IP information via the pxe cached info struct
 153  */
 154 static int
 155 pxe_init(void)
 156 {
 157         t_PXENV_GET_CACHED_INFO *gci_p;
 158         int     counter;
 159         uint8_t checksum;
 160         uint8_t *checkptr;
 161
 162         if(pxenv_p == NULL)
 163                 return (0);
 164
 165         /*  look for "PXENV+" */
 166         if (bcmp((void *)pxenv_p->Signature, S_SIZE("PXENV+"))) {
 167                 pxenv_p = NULL;
 168                 return (0);
 169         }
 170
 171         /* make sure the size is something we can handle */
 172         if (pxenv_p->Length > sizeof(*pxenv_p)) {
 173                 printf("PXENV+ structure too large, ignoring\n");
 174                 pxenv_p = NULL;
 175                 return (0);
 176         }
 177
 178         /*
 179          * do byte checksum:
 180          * add up each byte in the structure, the total should be 0
 181          */
 182         checksum = 0;
 183         checkptr = (uint8_t *) pxenv_p;
 184         for (counter = 0; counter < pxenv_p->Length; counter++)
 185                 checksum += *checkptr++;
 186         if (checksum != 0) {
 187                 printf("PXENV+ structure failed checksum, ignoring\n");
 188                 pxenv_p = NULL;
 189                 return (0);
 190         }
 191
 192
 193         /*
 194          * PXENV+ passed, so use that if !PXE is not available or
 195          * the checksum fails.
 196          */
 197         pxe_call = pxenv_call;
 198         if (pxenv_p->Version >= 0x0200) {
 199                 for (;;) {
 200                         if (bcmp((void *)pxe_p->Signature, S_SIZE("!PXE"))) {
 201                                 pxe_p = NULL;
 202                                 break;
 203                         }
 204                         checksum = 0;
 205                         checkptr = (uint8_t *)pxe_p;
 206                         for (counter = 0; counter < pxe_p->StructLength;
 207                              counter++)
 208                                 checksum += *checkptr++;
 209                         if (checksum != 0) {
 210                                 pxe_p = NULL;
 211                                 break;
 212                         }
 213                         pxe_call = bangpxe_call;
 214                         break;
 215                 }
 216         }
 217
 218         printf("\nPXE version %d.%d, real mode entry point ",
 219                (uint8_t) (pxenv_p->Version >> 8),
 220                (uint8_t) (pxenv_p->Version & 0xFF));
 221         if (pxe_call == bangpxe_call)
 222                 printf("@%04x:%04x\n",
 223                        pxe_p->EntryPointSP.segment,
 224                        pxe_p->EntryPointSP.offset);
 225         else
 226                 printf("@%04x:%04x\n",
 227                        pxenv_p->RMEntry.segment, pxenv_p->RMEntry.offset);
 228
 229         gci_p = (t_PXENV_GET_CACHED_INFO *) scratch_buffer;
 230         bzero(gci_p, sizeof(*gci_p));
 231         gci_p->PacketType =  PXENV_PACKET_TYPE_BINL_REPLY;
 232         pxe_call(PXENV_GET_CACHED_INFO);
 233         if (gci_p->Status != 0) {
 234                 pxe_perror(gci_p->Status);
 235                 pxe_p = NULL;
 236                 return (0);
 237         }
 238         bcopy(PTOV((gci_p->Buffer.segment << 4) + gci_p->Buffer.offset),
 239               &bootplayer, gci_p->BufferSize);
 240         return (1);
 241 }
 242
 243
 244 static int
 245 pxe_strategy(void *devdata, int flag, daddr_t dblk, size_t size,
 246                 char *buf, size_t *rsize)
 247 {
 248         return (EIO);
 249 }
 250
 251 static int
 252 pxe_open(struct open_file *f, ...)
 253 {
 254     va_list args;
 255     char *devname;              /* Device part of file name (or NULL). */
 256     char temp[FNAME_SIZE];
 257     int error = 0;
 258     int i;
 259
 260     va_start(args, f);
 261     devname = va_arg(args, char*);
 262     va_end(args);
 263
 264     /* On first open, do netif open, mount, etc. */
 265     if (pxe_opens == 0) {
 266         /* Find network interface. */
 267         if (pxe_sock < 0) {
 268             pxe_sock = netif_open(devname);
 269             if (pxe_sock < 0) {
 270                 printf("pxe_open: netif_open() failed\n");
 271                 return (ENXIO);
 272             }
 273             if (pxe_debug)
 274                 printf("pxe_open: netif_open() succeeded\n");
 275         }
 276         if (rootip.s_addr == 0) {
 277                 /*
 278                  * Do a bootp/dhcp request to find out where our
 279                  * NFS/TFTP server is.  Even if we dont get back
 280                  * the proper information, fall back to the server
 281                  * which brought us to life and a default rootpath.
 282                  */
 283                 bootp(pxe_sock, BOOTP_PXE);
 284                 if (rootip.s_addr == 0)
 285                         rootip.s_addr = bootplayer.sip;
 286                 if (!rootpath[1])
 287                         strcpy(rootpath, PXENFSROOTPATH);
 288
 289                 for (i = 0; rootpath[i] != '\0' && i < FNAME_SIZE; i++) {
 290                         if (rootpath[i] == ':')
 291                                 break;
 292                 }
 293                 if (i && i != FNAME_SIZE && rootpath[i] == ':') {
 294                         rootpath[i++] = '\0';
 295                         if (inet_addr(&rootpath[0]) != INADDR_NONE)
 296                                 rootip.s_addr = inet_addr(&rootpath[0]);
 297                         bcopy(&rootpath[i], &temp[0], strlen(&rootpath[i])+1);
 298                         bcopy(&temp[0], &rootpath[0], strlen(&rootpath[i])+1);
 299                 }
 300                 printf("pxe_open: ip address : %s\n", inet_ntoa(myip));
 301                 printf("pxe_open: ip netmask : %s\n", intoa(netmask));
 302                 printf("pxe_open: nfs root mount: %s:%s\n", inet_ntoa(rootip), rootpath);
 303                 printf("pxe_open: gateway ip:  %s\n", inet_ntoa(gateip));
 304
 305                 setenv("boot.netif.ip", inet_ntoa(myip), 1);
 306                 setenv("boot.netif.netmask", intoa(netmask), 1);
 307                 setenv("boot.netif.gateway", inet_ntoa(gateip), 1);
 308                 if (bootplayer.Hardware == ETHER_TYPE) {
 309                     sprintf(temp, "%6D", bootplayer.CAddr, ":");
 310                     setenv("boot.netif.hwaddr", temp, 1);
 311                 }
 312                 setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
 313                 setenv("boot.nfsroot.path", rootpath, 1);
 314         }
 315     }
 316     pxe_opens++;
 317     f->f_devdata = &pxe_sock;
 318     return (error);
 319 }
 320
 321 static int
 322 pxe_close(struct open_file *f)
 323 {
 324
 325 #ifdef  PXE_DEBUG
 326     if (pxe_debug)
 327         printf("pxe_close: opens=%d\n", pxe_opens);
 328 #endif
 329
 330     /* On last close, do netif close, etc. */
 331     f->f_devdata = NULL;
 332     /* Extra close call? */
 333     if (pxe_opens <= 0)
 334         return (0);
 335     pxe_opens--;
 336     /* Not last close? */
 337     if (pxe_opens > 0)
 338         return(0);
 339
 340     /* get an NFS filehandle for our root filesystem */
 341     pxe_setnfshandle(rootpath);
 342
 343     if (pxe_sock >= 0) {
 344
 345 #ifdef PXE_DEBUG
 346         if (pxe_debug)
 347             printf("pxe_close: calling netif_close()\n");
 348 #endif
 349         netif_close(pxe_sock);
 350         pxe_sock = -1;
 351     }
 352     return (0);
 353 }
 354
 355 static void
 356 pxe_print(int verbose)
 357 {
 358         if (pxe_call != NULL) {
 359                 if (*bootplayer.Sname == '\0') {
 360                         printf("      "IP_STR":%s\n",
 361                                IP_ARGS(htonl(bootplayer.sip)),
 362                                bootplayer.bootfile);
 363                 } else {
 364                         printf("      %s:%s\n", bootplayer.Sname,
 365                                bootplayer.bootfile);
 366                 }
 367         }
 368
 369         return;
 370 }
 371
 372 static void
 373 pxe_cleanup(void)
 374 {
 375 #ifdef PXE_DEBUG
 376         t_PXENV_UNLOAD_STACK *unload_stack_p =
 377             (t_PXENV_UNLOAD_STACK *)scratch_buffer;
 378         t_PXENV_UNDI_SHUTDOWN *undi_shutdown_p =
 379             (t_PXENV_UNDI_SHUTDOWN *)scratch_buffer;
 380 #endif
 381
 382         if (pxe_call == NULL)
 383                 return;
 384
 385         pxe_call(PXENV_UNDI_SHUTDOWN);
 386
 387 #ifdef PXE_DEBUG
 388         if (pxe_debug && undi_shutdown_p->Status != 0)
 389                 printf("pxe_cleanup: UNDI_SHUTDOWN failed %x\n",
 390                        undi_shutdown_p->Status);
 391 #endif
 392
 393         pxe_call(PXENV_UNLOAD_STACK);
 394
 395 #ifdef PXE_DEBUG
 396         if (pxe_debug && unload_stack_p->Status != 0)
 397                 printf("pxe_cleanup: UNLOAD_STACK failed %x\n",
 398                     unload_stack_p->Status);
 399 #endif
 400 }
 401
 402 void
 403 pxe_perror(int err)
 404 {
 405         return;
 406 }
 407
 408 /*
 409  * Reach inside the libstand NFS code and dig out an NFS handle
 410  * for the root filesystem.  If there is no nfs handle but a NFS root
 411  * path was dynamically requested (not just as a default), then try
 412  * to get the handle.  This occurs if we are compiled for TFTP operation
 413  * but still want to pass an NFS root to the kernel.
 414  */
 415 struct nfs_iodesc {
 416         struct  iodesc  *iodesc;
 417         off_t   off;
 418         u_char  fh[NFS_FHSIZE];
 419         /* structure truncated here */
 420 };
 421 extern struct   nfs_iodesc nfs_root_node;
 422
 423 static void
 424 pxe_setnfshandle(char *rootpath)
 425 {
 426         int     i;
 427         u_char  *fh;
 428         char    buf[2 * NFS_FHSIZE + 3], *cp;
 429
 430         fh = &nfs_root_node.fh[0];
 431
 432         /*
 433          * If no file handle exists but a root path was dynamically
 434          * requested, try to get a good handle.
 435          */
 436         for (i = 0; i < NFS_FHSIZE; ++i) {
 437                 if (fh[i])
 438                         break;
 439         }
 440         if (i != NFS_FHSIZE) {
 441                 buf[0] = 'X';
 442                 cp = &buf[1];
 443                 for (i = 0; i < NFS_FHSIZE; i++, cp += 2)
 444                         sprintf(cp, "%02x", fh[i]);
 445                 sprintf(cp, "X");
 446                 setenv("boot.nfsroot.nfshandle", buf, 1);
 447         }
 448 }
 449
 450 void
 451 pxenv_call(int func)
 452 {
 453 #ifdef PXE_DEBUG
 454         if (pxe_debug)
 455                 printf("pxenv_call %x\n", func);
 456 #endif
 457
 458         bzero(&v86, sizeof(v86));
 459         bzero(data_buffer, sizeof(data_buffer));
 460
 461         __pxenvseg = pxenv_p->RMEntry.segment;
 462         __pxenvoff = pxenv_p->RMEntry.offset;
 463
 464         v86.ctl  = V86_ADDR | V86_CALLF | V86_FLAGS;
 465         v86.es   = VTOPSEG(scratch_buffer);
 466         v86.edi  = VTOPOFF(scratch_buffer);
 467         v86.addr = (VTOPSEG(__pxenventry) << 16) | VTOPOFF(__pxenventry);
 468         v86.ebx  = func;
 469         v86int();
 470         v86.ctl  = V86_FLAGS;
 471 }
 472
 473 void
 474 bangpxe_call(int func)
 475 {
 476 #ifdef PXE_DEBUG
 477         if (pxe_debug)
 478                 printf("bangpxe_call %x\n", func);
 479 #endif
 480
 481         bzero(&v86, sizeof(v86));
 482         bzero(data_buffer, sizeof(data_buffer));
 483
 484         __bangpxeseg = pxe_p->EntryPointSP.segment;
 485         __bangpxeoff = pxe_p->EntryPointSP.offset;
 486
 487         v86.ctl  = V86_ADDR | V86_CALLF | V86_FLAGS;
 488         v86.edx  = VTOPSEG(scratch_buffer);
 489         v86.eax  = VTOPOFF(scratch_buffer);
 490         v86.addr = (VTOPSEG(__bangpxeentry) << 16) | VTOPOFF(__bangpxeentry);
 491         v86.ebx  = func;
 492         v86int();
 493         v86.ctl  = V86_FLAGS;
 494 }
 495
 496
 497 time_t
 498 getsecs(void)
 499 {
 500         time_t n = 0;
 501         time(&n);
 502         return n;
 503 }
 504
 505 static int
 506 pxe_netif_match(struct netif *nif, void *machdep_hint)
 507 {
 508         return 1;
 509 }
 510
 511
 512 static int
 513 pxe_netif_probe(struct netif *nif, void *machdep_hint)
 514 {
 515         t_PXENV_UDP_OPEN *udpopen_p = (t_PXENV_UDP_OPEN *)scratch_buffer;
 516
 517         if (pxe_call == NULL)
 518                 return -1;
 519
 520         bzero(udpopen_p, sizeof(*udpopen_p));
 521         udpopen_p->src_ip = bootplayer.yip;
 522         pxe_call(PXENV_UDP_OPEN);
 523
 524         if (udpopen_p->status != 0) {
 525                 printf("pxe_netif_probe: failed %x\n", udpopen_p->status);
 526                 return -1;
 527         }
 528         return 0;
 529 }
 530
 531 static void
 532 pxe_netif_end(struct netif *nif)
 533 {
 534         t_PXENV_UDP_CLOSE *udpclose_p = (t_PXENV_UDP_CLOSE *)scratch_buffer;
 535         bzero(udpclose_p, sizeof(*udpclose_p));
 536
 537         pxe_call(PXENV_UDP_CLOSE);
 538         if (udpclose_p->status != 0)
 539                 printf("pxe_end failed %x\n", udpclose_p->status);
 540 }
 541
 542 static void
 543 pxe_netif_init(struct iodesc *desc, void *machdep_hint)
 544 {
 545         int i;
 546         for (i = 0; i < 6; ++i)
 547                 desc->myea[i] = bootplayer.CAddr[i];
 548         desc->xid = bootplayer.ident;
 549 }
 550
 551 static int
 552 pxe_netif_get(struct iodesc *desc, void *pkt, size_t len, time_t timeout)
 553 {
 554         return len;
 555 }
 556
 557 static int
 558 pxe_netif_put(struct iodesc *desc, void *pkt, size_t len)
 559 {
 560         return len;
 561 }
 562
 563 ssize_t
 564 sendudp(struct iodesc *h, void *pkt, size_t len)
 565 {
 566         t_PXENV_UDP_WRITE *udpwrite_p = (t_PXENV_UDP_WRITE *)scratch_buffer;
 567         bzero(udpwrite_p, sizeof(*udpwrite_p));
 568
 569         udpwrite_p->ip             = h->destip.s_addr;
 570         udpwrite_p->dst_port       = h->destport;
 571         udpwrite_p->src_port       = h->myport;
 572         udpwrite_p->buffer_size    = len;
 573         udpwrite_p->buffer.segment = VTOPSEG(pkt);
 574         udpwrite_p->buffer.offset  = VTOPOFF(pkt);
 575
 576         if (netmask == 0 || SAMENET(myip, h->destip, netmask))
 577                 udpwrite_p->gw = 0;
 578         else
 579                 udpwrite_p->gw = gateip.s_addr;
 580
 581         pxe_call(PXENV_UDP_WRITE);
 582
 583 #if 0
 584         /* XXX - I dont know why we need this. */
 585         delay(1000);
 586 #endif
 587         if (udpwrite_p->status != 0) {
 588                 /* XXX: This happens a lot.  It shouldn't. */
 589                 if (udpwrite_p->status != 1)
 590                         printf("sendudp failed %x\n", udpwrite_p->status);
 591                 return -1;
 592         }
 593         return len;
 594 }
 595
 596 ssize_t
 597 readudp(struct iodesc *h, void *pkt, size_t len, time_t timeout)
 598 {
 599         t_PXENV_UDP_READ *udpread_p = (t_PXENV_UDP_READ *)scratch_buffer;
 600         struct udphdr *uh = NULL;
 601
 602         uh = (struct udphdr *) pkt - 1;
 603         bzero(udpread_p, sizeof(*udpread_p));
 604
 605         udpread_p->dest_ip        = h->myip.s_addr;
 606         udpread_p->d_port         = h->myport;
 607         udpread_p->buffer_size    = len;
 608         udpread_p->buffer.segment = VTOPSEG(data_buffer);
 609         udpread_p->buffer.offset  = VTOPOFF(data_buffer);
 610
 611         pxe_call(PXENV_UDP_READ);
 612
 613 #if 0
 614         /* XXX - I dont know why we need this. */
 615         delay(1000);
 616 #endif
 617         if (udpread_p->status != 0) {
 618                 /* XXX: This happens a lot.  It shouldn't. */
 619                 if (udpread_p->status != 1)
 620                         printf("readudp failed %x\n", udpread_p->status);
 621                 return -1;
 622         }
 623         bcopy(data_buffer, pkt, udpread_p->buffer_size);
 624         uh->uh_sport = udpread_p->s_port;
 625         return udpread_p->buffer_size;
 626 }