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/i386/include/in_cksum.h

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      from tahoe:     in_cksum.c      1.2     86/01/05
   30  *      from:           @(#)in_cksum.c  1.3 (Berkeley) 1/19/91
   31  *      from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
   32  * $FreeBSD: stable/9/sys/i386/include/in_cksum.h 238228 2012-07-08 10:46:55Z bz $
   33  */
   34 
   35 #ifndef _MACHINE_IN_CKSUM_H_
   36 #define _MACHINE_IN_CKSUM_H_    1
   37 
   38 #ifndef _SYS_CDEFS_H_
   39 #error this file needs sys/cdefs.h as a prerequisite
   40 #endif
   41 
   42 /*
   43  * MP safe (alfred)
   44  */
   45 
   46 #include <sys/cdefs.h>
   47 
   48 #define in_cksum(m, len)        in_cksum_skip(m, len, 0)
   49 
   50 /*
   51  * It it useful to have an Internet checksum routine which is inlineable
   52  * and optimized specifically for the task of computing IP header checksums
   53  * in the normal case (where there are no options and the header length is
   54  * therefore always exactly five 32-bit words.
   55  */
   56 #if defined(__GNUCLIKE_ASM) && !defined(__INTEL_COMPILER)
   57 #if defined(IPVERSION) && (IPVERSION == 4)
   58 static __inline u_int
   59 in_cksum_hdr(const struct ip *ip)
   60 {
   61         u_int sum = 0;
   62 
   63         __asm(
   64                 "addl %1, %0\n"
   65                 "adcl %2, %0\n"
   66                 "adcl %3, %0\n"
   67                 "adcl %4, %0\n"
   68                 "adcl %5, %0\n"
   69                 "adcl $0, %0"
   70                 : "+r" (sum)
   71                 : "g" (((const u_int32_t *)ip)[0]),
   72                   "g" (((const u_int32_t *)ip)[1]),
   73                   "g" (((const u_int32_t *)ip)[2]),
   74                   "g" (((const u_int32_t *)ip)[3]),
   75                   "g" (((const u_int32_t *)ip)[4])
   76                 : "cc"
   77         );
   78         sum = (sum & 0xffff) + (sum >> 16);
   79         if (sum > 0xffff)
   80                 sum -= 0xffff;
   81 
   82         return ~sum & 0xffff;
   83 }
   84 
   85 static __inline void
   86 in_cksum_update(struct ip *ip)
   87 {
   88         int __tmpsum;
   89         __tmpsum = (int)ntohs(ip->ip_sum) + 256;
   90         ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
   91 }
   92 #endif
   93 
   94 static __inline u_short
   95 in_addword(u_short sum, u_short b)
   96 {
   97         __asm(
   98                 "addw %1, %0\n"
   99                 "adcw $0, %0"
  100                 : "+r" (sum)
  101                 : "g" (b)
  102                 : "cc"
  103         );
  104         return (sum);
  105 }
  106 
  107 static __inline u_short
  108 in_pseudo(u_int sum, u_int b, u_int c)
  109 {
  110         __asm(
  111                 "addl %1, %0\n"
  112                 "adcl %2, %0\n"
  113                 "adcl $0, %0"
  114                 : "+r" (sum)
  115                 : "g" (b),
  116                   "g" (c)
  117                 : "cc"
  118         );
  119         sum = (sum & 0xffff) + (sum >> 16);
  120         if (sum > 0xffff)
  121                 sum -= 0xffff;
  122         return (sum);
  123 }
  124 
  125 #else
  126 #if defined(IPVERSION) && (IPVERSION == 4)
  127 #define in_cksum_update(ip) \
  128         do { \
  129                 int __tmpsum; \
  130                 __tmpsum = (int)ntohs(ip->ip_sum) + 256; \
  131                 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \
  132         } while(0)
  133 
  134 #endif
  135 #endif
  136 
  137 #ifdef _KERNEL
  138 #if !defined(__GNUCLIKE_ASM) || defined(__INTEL_COMPILER)
  139 #if defined(IPVERSION) && (IPVERSION == 4)
  140 u_int in_cksum_hdr(const struct ip *ip);
  141 #endif
  142 u_short in_addword(u_short sum, u_short b);
  143 u_short in_pseudo(u_int sum, u_int b, u_int c);
  144 #endif
  145 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
  146 #endif /* _KERNEL */
  147 
  148 #endif /* _MACHINE_IN_CKSUM_H_ */

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