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

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