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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192/* SPDX-License-Identifier: GPL-2.0-or-later *//* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Checksumming functions for IP, TCP, UDP and so on * * Authors: Jorge Cwik, <jorge@laser.satlink.net> * Arnt Gulbrandsen, <agulbra@nvg.unit.no> * Borrows very liberally from tcp.c and ip.c, see those * files for more names. */
#ifndef _CHECKSUM_H#define _CHECKSUM_H
#include <linux/errno.h>#include <asm/types.h>#include <asm/byteorder.h>#include <asm/checksum.h>#if !defined(_HAVE_ARCH_COPY_AND_CSUM_FROM_USER) || !defined(HAVE_CSUM_COPY_USER)#include <linux/uaccess.h>#endif
#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USERstatic __always_inline__wsum csum_and_copy_from_user (const void __user *src, void *dst, int len){ if (copy_from_user(dst, src, len)) return 0; return csum_partial(dst, len, ~0U);}#endif
#ifndef HAVE_CSUM_COPY_USERstatic __always_inline __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len){ __wsum sum = csum_partial(src, len, ~0U);
if (copy_to_user(dst, src, len) == 0) return sum; return 0;}#endif
#ifndef _HAVE_ARCH_CSUM_AND_COPYstatic __always_inline __wsumcsum_partial_copy_nocheck(const void *src, void *dst, int len){ memcpy(dst, src, len); return csum_partial(dst, len, 0);}#endif
#ifndef HAVE_ARCH_CSUM_ADDstatic __always_inline __wsum csum_add(__wsum csum, __wsum addend){ u32 res = (__force u32)csum; res += (__force u32)addend; return (__force __wsum)(res + (res < (__force u32)addend));}#endif
static __always_inline __wsum csum_sub(__wsum csum, __wsum addend){ return csum_add(csum, ~addend);}
static __always_inline __sum16 csum16_add(__sum16 csum, __be16 addend){ u16 res = (__force u16)csum;
res += (__force u16)addend; return (__force __sum16)(res + (res < (__force u16)addend));}
static __always_inline __sum16 csum16_sub(__sum16 csum, __be16 addend){ return csum16_add(csum, ~addend);}
#ifndef HAVE_ARCH_CSUM_SHIFTstatic __always_inline __wsum csum_shift(__wsum sum, int offset){ /* rotate sum to align it with a 16b boundary */ if (offset & 1) return (__force __wsum)ror32((__force u32)sum, 8); return sum;}#endif
static __always_inline __wsumcsum_block_add(__wsum csum, __wsum csum2, int offset){ return csum_add(csum, csum_shift(csum2, offset));}
static __always_inline __wsumcsum_block_sub(__wsum csum, __wsum csum2, int offset){ return csum_block_add(csum, ~csum2, offset);}
static __always_inline __wsum csum_unfold(__sum16 n){ return (__force __wsum)n;}
#define CSUM_MANGLED_0 ((__force __sum16)0xffff)
static __always_inline void csum_replace_by_diff(__sum16 *sum, __wsum diff){ *sum = csum_fold(csum_add(diff, ~csum_unfold(*sum)));}
static __always_inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to){ __wsum tmp = csum_sub(~csum_unfold(*sum), (__force __wsum)from);
*sum = csum_fold(csum_add(tmp, (__force __wsum)to));}
/* Implements RFC 1624 (Incremental Internet Checksum) * 3. Discussion states : * HC' = ~(~HC + ~m + m') * m : old value of a 16bit field * m' : new value of a 16bit field */static __always_inline void csum_replace2(__sum16 *sum, __be16 old, __be16 new){ *sum = ~csum16_add(csum16_sub(~(*sum), old), new);}
static inline void csum_replace(__wsum *csum, __wsum old, __wsum new){ *csum = csum_add(csum_sub(*csum, old), new);}
static inline unsigned short csum_from32to16(unsigned int sum){ sum += (sum >> 16) | (sum << 16); return (unsigned short)(sum >> 16);}
struct sk_buff;void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, __be32 from, __be32 to, bool pseudohdr);void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb, const __be32 *from, const __be32 *to, bool pseudohdr);void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb, __wsum diff, bool pseudohdr, bool ipv6);
static __always_inlinevoid inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb, __be16 from, __be16 to, bool pseudohdr){ inet_proto_csum_replace4(sum, skb, (__force __be32)from, (__force __be32)to, pseudohdr);}
static __always_inline __wsum remcsum_adjust(void *ptr, __wsum csum, int start, int offset){ __sum16 *psum = (__sum16 *)(ptr + offset); __wsum delta;
/* Subtract out checksum up to start */ csum = csum_sub(csum, csum_partial(ptr, start, 0));
/* Set derived checksum in packet */ delta = csum_sub((__force __wsum)csum_fold(csum), (__force __wsum)*psum); *psum = csum_fold(csum);
return delta;}
static __always_inline void remcsum_unadjust(__sum16 *psum, __wsum delta){ *psum = csum_fold(csum_sub(delta, (__force __wsum)*psum));}
static __always_inline __wsum wsum_negate(__wsum val){ return (__force __wsum)-((__force u32)val);}#endif