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

     /*-
      * Copyright (c) 1990 The Regents of the University of California.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from tahoe:     in_cksum.c      1.2     86/01/05
     *      from:           @(#)in_cksum.c  1.3 (Berkeley) 1/19/91
     *      from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
     *      from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg
     * $FreeBSD: releng/11.0/sys/mips/include/in_cksum.h 286336 2015-08-05 19:05:12Z emaste $
     */
    
    #ifndef _MACHINE_IN_CKSUM_H_
    #define _MACHINE_IN_CKSUM_H_    1
    
    #include <sys/cdefs.h>
    
    #define in_cksum(m, len)        in_cksum_skip(m, len, 0)
    
    #if defined(IPVERSION) && (IPVERSION == 4)
    /*
     * It it useful to have an Internet checksum routine which is inlineable
     * and optimized specifically for the task of computing IP header checksums
     * in the normal case (where there are no options and the header length is
     * therefore always exactly five 32-bit words.
     */
    #ifdef __CC_SUPPORTS___INLINE
    
    static __inline void
    in_cksum_update(struct ip *ip)
    {
            int __tmpsum;
            __tmpsum = (int)ntohs(ip->ip_sum) + 256;
            ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
    }
    
    #else
    
    #define in_cksum_update(ip)                                             \
            do {                                                            \
                    int __tmpsum;                                           \
                    __tmpsum = (int)ntohs(ip->ip_sum) + 256;                \
                    ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));        \
            } while(0)
    
    #endif
    #endif
    
    #ifdef _KERNEL
    #if defined(IPVERSION) && (IPVERSION == 4)
    u_int in_cksum_hdr(const struct ip *ip);
    #endif
    u_short in_addword(u_short sum, u_short b);
    u_short in_pseudo(u_int sum, u_int b, u_int c);
    u_short in_cksum_skip(struct mbuf *m, int len, int skip);
    #endif
    
    #endif /* _MACHINE_IN_CKSUM_H_ */

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