174 строки
4.6 KiB
C
174 строки
4.6 KiB
C
/* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */
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#ifndef __SPARC64_CHECKSUM_H
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#define __SPARC64_CHECKSUM_H
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/* checksum.h: IP/UDP/TCP checksum routines on the V9.
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*
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* Copyright(C) 1995 Linus Torvalds
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* Copyright(C) 1995 Miguel de Icaza
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* Copyright(C) 1996 David S. Miller
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* Copyright(C) 1996 Eddie C. Dost
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* Copyright(C) 1997 Jakub Jelinek
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*
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* derived from:
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* Alpha checksum c-code
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* ix86 inline assembly
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* RFC1071 Computing the Internet Checksum
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*/
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#include <linux/in6.h>
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#include <asm/uaccess.h>
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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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extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
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/* the same as csum_partial, but copies from user space while it
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* checksums
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*
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* here even more important to align src and dst on a 32-bit (or even
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* better 64-bit) boundary
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*/
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extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
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unsigned char *dst,
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int len, unsigned int sum);
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extern long __csum_partial_copy_from_user(const unsigned char __user *src,
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unsigned char *dst, int len,
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unsigned int sum);
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static inline unsigned int
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csum_partial_copy_from_user(const unsigned char __user *src,
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unsigned char *dst, int len,
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unsigned int sum, int *err)
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{
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long ret = __csum_partial_copy_from_user(src, dst, len, sum);
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if (ret < 0)
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*err = -EFAULT;
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return (unsigned int) ret;
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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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extern long __csum_partial_copy_to_user(const unsigned char *src,
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unsigned char __user *dst, int len,
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unsigned int sum);
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static inline unsigned int
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csum_and_copy_to_user(const unsigned char *src,
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unsigned char __user *dst, int len,
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unsigned int sum, int *err)
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{
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long ret = __csum_partial_copy_to_user(src, dst, len, sum);
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if (ret < 0)
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*err = -EFAULT;
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return (unsigned int) ret;
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}
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/* ihl is always 5 or greater, almost always is 5, and iph is word aligned
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* the majority of the time.
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*/
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extern unsigned short ip_fast_csum(__const__ unsigned char *iph,
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unsigned int ihl);
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/* Fold a partial checksum without adding pseudo headers. */
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static inline unsigned short csum_fold(unsigned int sum)
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{
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unsigned int tmp;
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__asm__ __volatile__(
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" addcc %0, %1, %1\n"
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" srl %1, 16, %1\n"
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" addc %1, %%g0, %1\n"
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" xnor %%g0, %1, %0\n"
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: "=&r" (sum), "=r" (tmp)
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: "0" (sum), "1" (sum<<16)
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: "cc");
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return (sum & 0xffff);
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}
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static inline unsigned long csum_tcpudp_nofold(unsigned long saddr,
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unsigned long daddr,
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unsigned int len,
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unsigned short proto,
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unsigned int sum)
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{
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__asm__ __volatile__(
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" addcc %1, %0, %0\n"
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" addccc %2, %0, %0\n"
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" addccc %3, %0, %0\n"
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" addc %0, %%g0, %0\n"
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: "=r" (sum), "=r" (saddr)
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: "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr)
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: "cc");
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return sum;
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}
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/*
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* computes the checksum of the TCP/UDP pseudo-header
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* returns a 16-bit checksum, already complemented
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*/
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static inline unsigned short int csum_tcpudp_magic(unsigned long saddr,
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unsigned long daddr,
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unsigned short len,
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unsigned short proto,
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unsigned int sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
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struct in6_addr *daddr,
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__u32 len,
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unsigned short proto,
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unsigned int sum)
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{
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__asm__ __volatile__ (
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" addcc %3, %4, %%g7\n"
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" addccc %5, %%g7, %%g7\n"
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" lduw [%2 + 0x0c], %%g2\n"
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" lduw [%2 + 0x08], %%g3\n"
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" addccc %%g2, %%g7, %%g7\n"
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" lduw [%2 + 0x04], %%g2\n"
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" addccc %%g3, %%g7, %%g7\n"
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" lduw [%2 + 0x00], %%g3\n"
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" addccc %%g2, %%g7, %%g7\n"
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" lduw [%1 + 0x0c], %%g2\n"
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" addccc %%g3, %%g7, %%g7\n"
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" lduw [%1 + 0x08], %%g3\n"
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" addccc %%g2, %%g7, %%g7\n"
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" lduw [%1 + 0x04], %%g2\n"
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" addccc %%g3, %%g7, %%g7\n"
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" lduw [%1 + 0x00], %%g3\n"
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" addccc %%g2, %%g7, %%g7\n"
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" addccc %%g3, %%g7, %0\n"
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" addc 0, %0, %0\n"
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: "=&r" (sum)
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: "r" (saddr), "r" (daddr), "r"(htonl(len)),
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"r"(htonl(proto)), "r"(sum)
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: "g2", "g3", "g7", "cc");
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return csum_fold(sum);
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}
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/* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */
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static inline unsigned short ip_compute_csum(unsigned char * 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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#endif /* !(__SPARC64_CHECKSUM_H) */
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