288 lines
6.4 KiB
C
288 lines
6.4 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle
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* Copyright (C) 1999 Silicon Graphics, Inc.
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* Copyright (C) 2001 Thiemo Seufer.
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* Copyright (C) 2002 Maciej W. Rozycki
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* Copyright (C) 2014 Imagination Technologies Ltd.
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*/
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#ifndef _ASM_CHECKSUM_H
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#define _ASM_CHECKSUM_H
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#ifdef CONFIG_GENERIC_CSUM
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#include <asm-generic/checksum.h>
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#else
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#include <linux/in6.h>
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#include <linux/uaccess.h>
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/*
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* computes the checksum of a memory block at buff, length len,
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* and adds in "sum" (32-bit)
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*
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* returns a 32-bit number suitable for feeding into itself
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* or csum_tcpudp_magic
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*
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* this function must be called with even lengths, except
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* for the last fragment, which may be odd
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*
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* it's best to have buff aligned on a 32-bit boundary
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*/
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__wsum csum_partial(const void *buff, int len, __wsum sum);
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__wsum __csum_partial_copy_kernel(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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__wsum __csum_partial_copy_from_user(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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__wsum __csum_partial_copy_to_user(const void *src, void *dst,
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int len, __wsum sum, int *err_ptr);
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/*
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* this is a new version of the above that records errors it finds in *errp,
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* but continues and zeros the rest of the buffer.
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*/
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static inline
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__wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len,
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__wsum sum, int *err_ptr)
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{
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might_fault();
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if (uaccess_kernel())
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return __csum_partial_copy_kernel((__force void *)src, dst,
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len, sum, err_ptr);
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else
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return __csum_partial_copy_from_user((__force void *)src, dst,
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len, sum, err_ptr);
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}
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
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static inline
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__wsum csum_and_copy_from_user(const void __user *src, void *dst,
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int len, __wsum sum, int *err_ptr)
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{
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if (access_ok(VERIFY_READ, src, len))
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return csum_partial_copy_from_user(src, dst, len, sum,
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err_ptr);
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if (len)
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*err_ptr = -EFAULT;
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return sum;
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}
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/*
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* Copy and checksum to user
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*/
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#define HAVE_CSUM_COPY_USER
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static inline
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__wsum csum_and_copy_to_user(const void *src, void __user *dst, int len,
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__wsum sum, int *err_ptr)
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{
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might_fault();
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if (access_ok(VERIFY_WRITE, dst, len)) {
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if (uaccess_kernel())
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return __csum_partial_copy_kernel(src,
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(__force void *)dst,
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len, sum, err_ptr);
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else
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return __csum_partial_copy_to_user(src,
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(__force void *)dst,
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len, sum, err_ptr);
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}
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if (len)
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*err_ptr = -EFAULT;
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return (__force __wsum)-1; /* invalid checksum */
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}
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/*
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* the same as csum_partial, but copies from user space (but on MIPS
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* we have just one address space, so this is identical to the above)
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*/
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__wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum);
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#define csum_partial_copy_nocheck csum_partial_copy_nocheck
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/*
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* Fold a partial checksum without adding pseudo headers
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*/
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static inline __sum16 csum_fold(__wsum csum)
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{
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u32 sum = (__force u32)csum;;
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sum += (sum << 16);
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csum = (sum < csum);
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sum >>= 16;
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sum += csum;
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return (__force __sum16)~sum;
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}
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#define csum_fold csum_fold
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*
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* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
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* Arnt Gulbrandsen.
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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const unsigned int *word = iph;
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const unsigned int *stop = word + ihl;
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unsigned int csum;
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int carry;
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csum = word[0];
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csum += word[1];
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carry = (csum < word[1]);
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csum += carry;
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csum += word[2];
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carry = (csum < word[2]);
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csum += carry;
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csum += word[3];
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carry = (csum < word[3]);
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csum += carry;
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word += 4;
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do {
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csum += *word;
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carry = (csum < *word);
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csum += carry;
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word++;
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} while (word != stop);
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return csum_fold(csum);
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}
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#define ip_fast_csum ip_fast_csum
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static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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__asm__(
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" .set push # csum_tcpudp_nofold\n"
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" .set noat \n"
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#ifdef CONFIG_32BIT
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" addu %0, %2 \n"
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" sltu $1, %0, %2 \n"
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" addu %0, $1 \n"
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" addu %0, %3 \n"
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" sltu $1, %0, %3 \n"
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" addu %0, $1 \n"
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" addu %0, %4 \n"
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" sltu $1, %0, %4 \n"
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" addu %0, $1 \n"
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#endif
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#ifdef CONFIG_64BIT
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" daddu %0, %2 \n"
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" daddu %0, %3 \n"
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" daddu %0, %4 \n"
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" dsll32 $1, %0, 0 \n"
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" daddu %0, $1 \n"
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" sltu $1, %0, $1 \n"
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" dsra32 %0, %0, 0 \n"
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" addu %0, $1 \n"
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#endif
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" .set pop"
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: "=r" (sum)
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: "0" ((__force unsigned long)daddr),
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"r" ((__force unsigned long)saddr),
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#ifdef __MIPSEL__
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"r" ((proto + len) << 8),
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#else
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"r" (proto + len),
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#endif
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"r" ((__force unsigned long)sum));
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return sum;
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}
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#define csum_tcpudp_nofold csum_tcpudp_nofold
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/*
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* this routine is used for miscellaneous IP-like checksums, mainly
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* in icmp.c
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*/
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold(csum_partial(buff, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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__wsum tmp;
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__asm__(
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" .set push # csum_ipv6_magic\n"
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" .set noreorder \n"
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" .set noat \n"
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" addu %0, %5 # proto (long in network byte order)\n"
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" sltu $1, %0, %5 \n"
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" addu %0, $1 \n"
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" addu %0, %6 # csum\n"
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" sltu $1, %0, %6 \n"
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" lw %1, 0(%2) # four words source address\n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 4(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 8(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 12(%2) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 0(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 4(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 8(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" lw %1, 12(%3) \n"
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" addu %0, $1 \n"
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" addu %0, %1 \n"
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" sltu $1, %0, %1 \n"
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" addu %0, $1 # Add final carry\n"
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" .set pop"
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: "=&r" (sum), "=&r" (tmp)
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: "r" (saddr), "r" (daddr),
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"0" (htonl(len)), "r" (htonl(proto)), "r" (sum));
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return csum_fold(sum);
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}
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#include <asm-generic/checksum.h>
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#endif /* CONFIG_GENERIC_CSUM */
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#endif /* _ASM_CHECKSUM_H */
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