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Current File : //sys/i386/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. * 4. 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 * $FreeBSD: release/9.1.0/sys/i386/include/in_cksum.h 238228 2012-07-08 10:46:55Z bz $ */ #ifndef _MACHINE_IN_CKSUM_H_ #define _MACHINE_IN_CKSUM_H_ 1 #ifndef _SYS_CDEFS_H_ #error this file needs sys/cdefs.h as a prerequisite #endif /* * MP safe (alfred) */ #include <sys/cdefs.h> #define in_cksum(m, len) in_cksum_skip(m, len, 0) /* * 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. */ #if defined(__GNUCLIKE_ASM) && !defined(__INTEL_COMPILER) #if defined(IPVERSION) && (IPVERSION == 4) static __inline u_int in_cksum_hdr(const struct ip *ip) { u_int sum = 0; __asm( "addl %1, %0\n" "adcl %2, %0\n" "adcl %3, %0\n" "adcl %4, %0\n" "adcl %5, %0\n" "adcl $0, %0" : "+r" (sum) : "g" (((const u_int32_t *)ip)[0]), "g" (((const u_int32_t *)ip)[1]), "g" (((const u_int32_t *)ip)[2]), "g" (((const u_int32_t *)ip)[3]), "g" (((const u_int32_t *)ip)[4]) : "cc" ); sum = (sum & 0xffff) + (sum >> 16); if (sum > 0xffff) sum -= 0xffff; return ~sum & 0xffff; } 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)); } #endif static __inline u_short in_addword(u_short sum, u_short b) { __asm( "addw %1, %0\n" "adcw $0, %0" : "+r" (sum) : "g" (b) : "cc" ); return (sum); } static __inline u_short in_pseudo(u_int sum, u_int b, u_int c) { __asm( "addl %1, %0\n" "adcl %2, %0\n" "adcl $0, %0" : "+r" (sum) : "g" (b), "g" (c) : "cc" ); sum = (sum & 0xffff) + (sum >> 16); if (sum > 0xffff) sum -= 0xffff; return (sum); } #else #if defined(IPVERSION) && (IPVERSION == 4) #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(__GNUCLIKE_ASM) || defined(__INTEL_COMPILER) #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); #endif u_short in_cksum_skip(struct mbuf *m, int len, int skip); #endif /* _KERNEL */ #endif /* _MACHINE_IN_CKSUM_H_ */