in_cksum.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1990 The Regents of the University of California.
    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  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      from tahoe:     in_cksum.c      1.2     86/01/05
   32  *      from:           @(#)in_cksum.c  1.3 (Berkeley) 1/19/91
   33  *      from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
   34  * $FreeBSD$
   35  */
   36 
   37 #ifndef _MACHINE_IN_CKSUM_H_
   38 #define _MACHINE_IN_CKSUM_H_    1
   39 
   40 #include <sys/cdefs.h>
   41 
   42 #define in_cksum(m, len)        in_cksum_skip(m, len, 0)
   43 
   44 /*
   45  * It it useful to have an Internet checksum routine which is inlineable
   46  * and optimized specifically for the task of computing IP header checksums
   47  * in the normal case (where there are no options and the header length is
   48  * therefore always exactly five 32-bit words.
   49  */
   50 #if defined(IPVERSION) && (IPVERSION == 4)
   51 static __inline u_int
   52 in_cksum_hdr(const struct ip *ip)
   53 {
   54         u_int sum = 0;
   55 
   56         __asm(
   57                 "addl %1, %0\n"
   58                 "adcl %2, %0\n"
   59                 "adcl %3, %0\n"
   60                 "adcl %4, %0\n"
   61                 "adcl %5, %0\n"
   62                 "adcl $0, %0"
   63                 : "+r" (sum)
   64                 : "g" (((const u_int32_t *)ip)[0]),
   65                   "g" (((const u_int32_t *)ip)[1]),
   66                   "g" (((const u_int32_t *)ip)[2]),
   67                   "g" (((const u_int32_t *)ip)[3]),
   68                   "g" (((const u_int32_t *)ip)[4])
   69                 : "cc"
   70         );
   71         sum = (sum & 0xffff) + (sum >> 16);
   72         if (sum > 0xffff)
   73                 sum -= 0xffff;
   74 
   75         return ~sum & 0xffff;
   76 }
   77 #endif
   78 
   79 static __inline u_short
   80 in_addword(u_short sum, u_short b)
   81 {
   82         __asm(
   83                 "addw %1, %0\n"
   84                 "adcw $0, %0"
   85                 : "+r" (sum)
   86                 : "g" (b)
   87                 : "cc"
   88         );
   89         return (sum);
   90 }
   91 
   92 static __inline u_short
   93 in_pseudo(u_int sum, u_int b, u_int c)
   94 {
   95         __asm(
   96                 "addl %1, %0\n"
   97                 "adcl %2, %0\n"
   98                 "adcl $0, %0"
   99                 : "+r" (sum)
  100                 : "g" (b),
  101                   "g" (c)
  102                 : "cc"
  103         );
  104         sum = (sum & 0xffff) + (sum >> 16);
  105         if (sum > 0xffff)
  106                 sum -= 0xffff;
  107         return (sum);
  108 }
  109 
  110 #ifdef _KERNEL
  111 
  112 #define HAVE_MD_IN_CKSUM
  113 
  114 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
  115 #endif /* _KERNEL */
  116 
  117 #endif /* _MACHINE_IN_CKSUM_H_ */

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FreeBSD/Linux Kernel Cross Reference sys/i386/include/in_cksum.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/include/in_cksum.h