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/netpfil/pf/in4_cksum.c

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    1 /*      $FreeBSD$       */
    2 /*      $OpenBSD: in4_cksum.c,v 1.7 2003/06/02 23:28:13 millert Exp $   */
    3 /*      $KAME: in4_cksum.c,v 1.10 2001/11/30 10:06:15 itojun Exp $      */
    4 /*      $NetBSD: in_cksum.c,v 1.13 1996/10/13 02:03:03 christos Exp $   */
    5 
    6 /*-
    7  * SPDX-License-Identifier: BSD-3-Clause
    8  *
    9  * Copyright (C) 1999 WIDE Project.
   10  * All rights reserved.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the project nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  */
   36 
   37 /*
   38  * Copyright (c) 1988, 1992, 1993
   39  *      The Regents of the University of California.  All rights reserved.
   40  *
   41  * Redistribution and use in source and binary forms, with or without
   42  * modification, are permitted provided that the following conditions
   43  * are met:
   44  * 1. Redistributions of source code must retain the above copyright
   45  *    notice, this list of conditions and the following disclaimer.
   46  * 2. Redistributions in binary form must reproduce the above copyright
   47  *    notice, this list of conditions and the following disclaimer in the
   48  *    documentation and/or other materials provided with the distribution.
   49  * 3. Neither the name of the University nor the names of its contributors
   50  *    may be used to endorse or promote products derived from this software
   51  *    without specific prior written permission.
   52  *
   53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   63  * SUCH DAMAGE.
   64  *
   65  *      @(#)in_cksum.c  8.1 (Berkeley) 6/10/93
   66  */
   67 
   68 #include <sys/param.h>
   69 #include <sys/systm.h>
   70 #include <sys/mbuf.h>
   71 
   72 #include <netinet/in.h>
   73 #include <netinet/in_systm.h>
   74 #include <netinet/ip.h>
   75 #include <netinet/ip_var.h>
   76 
   77 #include <machine/in_cksum.h>
   78 
   79 #define ADDCARRY(x)  (x > 65535 ? x -= 65535 : x)
   80 #define REDUCE {l_util.l = sum; sum = l_util.s[0] + l_util.s[1]; (void)ADDCARRY(sum);}
   81 
   82 int in4_cksum(struct mbuf *, u_int8_t, int, int);
   83 
   84 int
   85 in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
   86 {
   87         union {
   88                 struct ipovly ipov;
   89                 u_int16_t w[10];
   90         } u;
   91         union {
   92                 u_int16_t s[2];
   93                 u_int32_t l;
   94         } l_util;
   95 
   96         u_int16_t *w;
   97         int psum;
   98         int sum = 0;
   99 
  100         if (nxt != 0) {
  101                 /* pseudo header */
  102                 if (off < sizeof(struct ipovly))
  103                         panic("in4_cksum: offset too short");
  104                 if (m->m_len < sizeof(struct ip))
  105                         panic("in4_cksum: bad mbuf chain");
  106                 bzero(&u.ipov, sizeof(u.ipov));
  107                 u.ipov.ih_len = htons(len);
  108                 u.ipov.ih_pr = nxt;
  109                 u.ipov.ih_src = mtod(m, struct ip *)->ip_src;
  110                 u.ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
  111                 w = u.w;
  112                 /* assumes sizeof(ipov) == 20 */
  113                 sum += w[0]; sum += w[1]; sum += w[2]; sum += w[3]; sum += w[4];
  114                 sum += w[5]; sum += w[6]; sum += w[7]; sum += w[8]; sum += w[9];
  115         }
  116 
  117         psum = in_cksum_skip(m, len + off, off);
  118         psum = ~psum & 0xffff;
  119         sum += psum;
  120         REDUCE;
  121         return (~sum & 0xffff);
  122 }

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