920b965865
in_cksum.h required ip.h to be included for struct ip. To be able to use some general checksum functions like in_addword() in a non-IPv4 context, limit the (also exported to user space) IPv4 specific functions to the times, when the ip.h header is present and IPVERSION is defined (to 4). We should consider more general checksum (updating) functions to also allow easier incremental checksum updates in the L3/4 stack and firewalls, as well as ponder further requirements by certain NIC drivers needing slightly different pseudo values in offloading cases. Thinking in terms of a better "library". Sponsored by: The FreeBSD Foundation Sponsored by: iXsystems Reviewed by: gnn (as part of the whole) MFC After: 3 days
176 lines
5.9 KiB
C
176 lines
5.9 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*-
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* Copyright (c) 2001 by Thomas Moestl <tmm@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* from tahoe: in_cksum.c 1.2 86/01/05
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* from: @(#)in_cksum.c 1.3 (Berkeley) 1/19/91
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* from: Id: in_cksum.c,v 1.8 1995/12/03 18:35:19 bde Exp
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* from: FreeBSD: src/sys/alpha/include/in_cksum.h,v 1.5 2000/05/06
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_IN_CKSUM_H_
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#define _MACHINE_IN_CKSUM_H_ 1
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#include <sys/cdefs.h>
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#define in_cksum(m, len) in_cksum_skip(m, len, 0)
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#if defined(IPVERSION) && (IPVERSION == 4)
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static __inline void
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in_cksum_update(struct ip *ip)
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{
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int __tmp;
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__tmp = (int)ip->ip_sum + 1;
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ip->ip_sum = __tmp + (__tmp >> 16);
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}
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#endif
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static __inline u_short
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in_addword(u_short sum, u_short b)
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{
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u_long __ret, __tmp;
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__asm(
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"sll %2, 16, %0\n"
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"sll %3, 16, %1\n"
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"addcc %0, %1, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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: "=&r" (__ret), "=&r" (__tmp) : "r" (sum), "r" (b) : "cc");
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return (__ret);
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}
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static __inline u_short
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in_pseudo(u_int sum, u_int b, u_int c)
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{
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u_long __tmp;
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__asm(
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"addcc %0, %3, %0\n"
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"addccc %0, %4, %0\n"
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"addc %0, 0, %0\n"
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"sll %0, 16, %1\n"
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"addcc %0, %1, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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: "=r" (sum), "=&r" (__tmp) : "0" (sum), "r" (b), "r" (c) : "cc");
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return (sum);
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}
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#if defined(IPVERSION) && (IPVERSION == 4)
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static __inline u_int
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in_cksum_hdr(struct ip *ip)
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{
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u_long __ret, __tmp1, __tmp2, __tmp3, __tmp4;
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/*
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* Use 32-bit memory accesses and additions - addition with carry only
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* works for 32 bits, and fixing up alignment issues for 64 is probably
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* more trouble than it's worth.
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* This may read outside of the ip header, but does not cross a page
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* boundary in doing so, so that should be OK.
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* Actually, this specialized implementation might be overkill - using
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* a generic implementation for both in_cksum_skip and in_cksum_hdr
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* should not be too much more expensive.
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*/
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#define __LD_ADD(addr, tmp, sum, offs, mod) \
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"lduw [" #addr " + " #offs "], " #tmp "\n" \
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"add" # mod " " #sum ", " #tmp ", " #sum "\n"
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__asm(
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"and %5, 3, %3\n"
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"andn %5, 3, %1\n"
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"brz,pt %3, 0f\n"
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" lduw [%1], %0\n"
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"mov 4, %4\n"
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"sub %4, %3, %4\n"
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"sll %4, 3, %4\n" /* fix up unaligned buffers */
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"mov 1, %2\n"
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"sll %2, %4, %4\n"
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"sub %4, 1, %4\n"
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"lduw [%1 + 20], %2\n"
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"andn %2, %4, %2\n"
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"and %0, %4, %0\n"
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"or %0, %2, %0\n"
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"0:\n"
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__LD_ADD(%1, %2, %0, 4, cc)
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__LD_ADD(%1, %2, %0, 8, ccc)
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__LD_ADD(%1, %2, %0, 12, ccc)
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__LD_ADD(%1, %2, %0, 16, ccc)
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"addc %0, 0, %0\n" /* reduce */
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"1:\n"
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"sll %0, 16, %2\n"
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"addcc %0, %2, %0\n"
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"srl %0, 16, %0\n"
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"addc %0, 0, %0\n"
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"andcc %3, 1, %3\n" /* need to byte-swap? */
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"clr %3\n"
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"bne,a,pn %%xcc, 1b\n"
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" sll %0, 8, %0\n"
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"not %0\n"
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"sll %0, 16, %0\n"
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"srl %0, 16, %0\n"
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: "=&r" (__ret), "=r" (__tmp1), "=&r" (__tmp2), "=&r" (__tmp3),
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"=&r" (__tmp4) : "1" (ip) : "cc");
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#undef __LD_ADD
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return (__ret);
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}
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#endif
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#ifdef _KERNEL
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u_short in_cksum_skip(struct mbuf *m, int len, int skip);
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#endif
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#endif /* _MACHINE_IN_CKSUM_H_ */
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