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  *      from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg
   35  * $FreeBSD$
   36  */
   37 
   38 #ifndef _MACHINE_IN_CKSUM_H_
   39 #define _MACHINE_IN_CKSUM_H_    1
   40 
   41 #include <sys/cdefs.h>
   42 
   43 #define in_cksum(m, len)        in_cksum_skip(m, len, 0)
   44 
   45 #if defined(IPVERSION) && (IPVERSION == 4)
   46 /*
   47  * It it useful to have an Internet checksum routine which is inlineable
   48  * and optimized specifically for the task of computing IP header checksums
   49  * in the normal case (where there are no options and the header length is
   50  * therefore always exactly five 32-bit words.
   51  */
   52 #ifdef __CC_SUPPORTS___INLINE
   53 
   54 static __inline void
   55 in_cksum_update(struct ip *ip)
   56 {
   57         int __tmpsum;
   58         __tmpsum = (int)ntohs(ip->ip_sum) + 256;
   59         ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));
   60 }
   61 
   62 #else
   63 
   64 #define in_cksum_update(ip)                                             \
   65         do {                                                            \
   66                 int __tmpsum;                                           \
   67                 __tmpsum = (int)ntohs(ip->ip_sum) + 256;                \
   68                 ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16));        \
   69         } while(0)
   70 
   71 #endif
   72 #endif
   73 
   74 #ifdef _KERNEL
   75 #if defined(IPVERSION) && (IPVERSION == 4)
   76 u_int in_cksum_hdr(const struct ip *ip);
   77 #endif
   78 u_short in_addword(u_short sum, u_short b);
   79 u_short in_pseudo(u_int sum, u_int b, u_int c);
   80 u_short in_cksum_skip(struct mbuf *m, int len, int skip);
   81 #endif
   82 
   83 #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