1 | /*- |
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2 | * Copyright (c) 1990 The Regents of the University of California. |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 4. Neither the name of the University nor the names of its contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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27 | * SUCH DAMAGE. |
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28 | * |
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29 | * from tahoe: in_cksum.c 1.2 86/01/05 |
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30 | * from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91 |
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31 | * from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp |
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32 | * from: src/sys/alpha/include/in_cksum.h,v 1.7 2005/03/02 21:33:20 joerg |
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33 | * $FreeBSD$ |
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34 | */ |
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35 | |
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36 | #ifndef _MACHINE_IN_CKSUM_HH_ |
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37 | #define _MACHINE_IN_CKSUM_HH_ 1 |
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38 | |
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39 | #include <freebsd/sys/cdefs.h> |
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40 | |
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41 | #define in_cksum(m, len) in_cksum_skip(m, len, 0) |
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42 | |
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43 | /* |
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44 | * It it useful to have an Internet checksum routine which is inlineable |
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45 | * and optimized specifically for the task of computing IP header checksums |
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46 | * in the normal case (where there are no options and the header length is |
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47 | * therefore always exactly five 32-bit words. |
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48 | */ |
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49 | #ifdef __CC_SUPPORTS___INLINE |
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50 | |
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51 | static __inline void |
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52 | in_cksum_update(struct ip *ip) |
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53 | { |
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54 | int __tmpsum; |
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55 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; |
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56 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); |
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57 | } |
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58 | |
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59 | #else |
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60 | |
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61 | #define in_cksum_update(ip) \ |
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62 | do { \ |
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63 | int __tmpsum; \ |
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64 | __tmpsum = (int)ntohs(ip->ip_sum) + 256; \ |
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65 | ip->ip_sum = htons(__tmpsum + (__tmpsum >> 16)); \ |
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66 | } while(0) |
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67 | |
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68 | #endif |
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69 | |
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70 | #ifdef _KERNEL |
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71 | u_int in_cksum_hdr(const struct ip *ip); |
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72 | u_short in_addword(u_short sum, u_short b); |
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73 | u_short in_pseudo(u_int sum, u_int b, u_int c); |
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74 | u_short in_cksum_skip(struct mbuf *m, int len, int skip); |
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75 | #endif |
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76 | |
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77 | #endif /* _MACHINE_IN_CKSUM_HH_ */ |
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