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  *      from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg
   33  * $FreeBSD: releng/8.0/sys/mips/include/in_cksum.h 178172 2008-04-13 07:27:37Z imp $
   34  */
   35 
   36 #ifndef _MACHINE_IN_CKSUM_H_
   37 #define _MACHINE_IN_CKSUM_H_    1
   38 
   39 #include <sys/cdefs.h>
   40 
   41 #define in_cksum(m, len)        in_cksum_skip(m, len, 0)
   42 
   43 /*
   44  * It it useful to have an Internet checksum routine which is inlineable
   45  * and optimized specifically for the task of computing IP header checksums
   46  * in the normal case (where there are no options and the header length is
   47  * therefore always exactly five 32-bit words.
   48  */
   49 #ifdef __CC_SUPPORTS___INLINE
   50 
   51 static __inline void
   52 in_cksum_update(struct ip *ip)
   53 {
   54         int __tmpsum;
   55         __tmpsum = (int)ntohs(ip->ip_sum) + 256;
   56         ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
   57 }
   58 
   59 #else
   60 
   61 #define in_cksum_update(ip)                                             \
   62         do {                                                            \
   63                 int __tmpsum;                                           \
   64                 __tmpsum = (int)ntohs(ip->ip_sum) + 256;                \
   65                 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));        \
   66         } while(0)
   67 
   68 #endif
   69 
   70 #ifdef _KERNEL
   71 u_int in_cksum_hdr(const struct ip *ip);
   72 u_short in_addword(u_short sum, u_short b);
   73 u_short in_pseudo(u_int sum, u_int b, u_int c);
   74 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
   75 #endif
   76 
   77 #endif /* _MACHINE_IN_CKSUM_H_ */

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

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