The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/libsa/net.c

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    1 /*      $NetBSD: net.c,v 1.28 2003/08/31 22:40:48 fvdl Exp $    */
    2 
    3 /*
    4  * Copyright (c) 1992 Regents of the University of California.
    5  * All rights reserved.
    6  *
    7  * This software was developed by the Computer Systems Engineering group
    8  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
    9  * contributed to Berkeley.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the University of
   22  *      California, Lawrence Berkeley Laboratory and its contributors.
   23  * 4. Neither the name of the University nor the names of its contributors
   24  *    may be used to endorse or promote products derived from this software
   25  *    without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   37  * SUCH DAMAGE.
   38  *
   39  * @(#) Header: net.c,v 1.9 93/08/06 19:32:15 leres Exp  (LBL)
   40  */
   41 
   42 #include <sys/param.h>
   43 #include <sys/socket.h>
   44 
   45 #ifdef _STANDALONE
   46 #include <lib/libkern/libkern.h>
   47 #else
   48 #include <string.h>
   49 #endif
   50 
   51 #include <net/if.h>
   52 #include <net/if_ether.h>
   53 
   54 #include <netinet/in.h>
   55 #include <netinet/in_systm.h>
   56 #include <netinet/ip.h>
   57 
   58 #include "stand.h"
   59 #include "net.h"
   60 
   61 /*
   62  * Send a packet and wait for a reply, with exponential backoff.
   63  *
   64  * The send routine must return the actual number of bytes written,
   65  * or -1 on error.
   66  *
   67  * The receive routine can indicate success by returning the number of
   68  * bytes read; it can return 0 to indicate EOF; it can return -1 with a
   69  * non-zero errno to indicate failure; finally, it can return -1 with a
   70  * zero errno to indicate it isn't done yet.
   71  */
   72 ssize_t
   73 sendrecv(d, sproc, sbuf, ssize, rproc, rbuf, rsize)
   74         struct iodesc *d;
   75         ssize_t (*sproc)(struct iodesc *, void *, size_t);
   76         void *sbuf;
   77         size_t ssize;
   78         ssize_t (*rproc)(struct iodesc *, void *, size_t, time_t);
   79         void *rbuf;
   80         size_t rsize;
   81 {
   82         ssize_t cc;
   83         time_t t, tmo, tlast;
   84         long tleft;
   85 
   86 #ifdef NET_DEBUG
   87         if (debug)
   88                 printf("sendrecv: called\n");
   89 #endif
   90 
   91         tmo = MINTMO;
   92         tlast = tleft = 0;
   93         t = getsecs();
   94         for (;;) {
   95                 if (tleft <= 0) {
   96                         if (tmo >= MAXTMO) {
   97                                 errno = ETIMEDOUT;
   98                                 return -1;
   99                         }
  100                         cc = (*sproc)(d, sbuf, ssize);
  101                         if (cc != -1 && (size_t)cc < ssize)
  102                                 panic("sendrecv: short write! (%d < %d)",
  103                                     cc, ssize);
  104 
  105                         tleft = tmo;
  106                         tmo <<= 1;
  107                         if (tmo > MAXTMO)
  108                                 tmo = MAXTMO;
  109 
  110                         if (cc == -1) {
  111                                 /* Error on transmit; wait before retrying */
  112                                 while ((getsecs() - t) < tmo);
  113                                 tleft = 0;
  114                                 continue;
  115                         }
  116 
  117                         tlast = t;
  118                 }
  119 
  120                 /* Try to get a packet and process it. */
  121                 cc = (*rproc)(d, rbuf, rsize, tleft);
  122                 /* Return on data, EOF or real error. */
  123                 if (cc != -1 || errno != 0)
  124                         return (cc);
  125 
  126                 /* Timed out or didn't get the packet we're waiting for */
  127                 t = getsecs();
  128                 tleft -= t - tlast;
  129                 tlast = t;
  130         }
  131 }

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