mirror of
https://github.com/tbsdtv/linux_media.git
synced 2025-07-22 20:30:58 +02:00
6e41c585e3
quite a few architectures have the same csum_partial_copy_nocheck() - simply memcpy() the data and then return the csum of the copy. hexagon, parisc, ia64, s390, um: explicitly spelled out that way. arc, arm64, csky, h8300, m68k/nommu, microblaze, mips/GENERIC_CSUM, nds32, nios2, openrisc, riscv, unicore32: end up picking the same thing spelled out in lib/checksum.h (with varying amounts of perversions along the way). everybody else (alpha, arm, c6x, m68k/mmu, mips/!GENERIC_CSUM, powerpc, sh, sparc, x86, xtensa) have non-generic variants. For all except c6x the declaration is in their asm/checksum.h. c6x uses the wrapper from asm-generic/checksum.h that would normally lead to the lib/checksum.h instance, but in case of c6x we end up using an asm function from arch/c6x instead. Screw that mess - have architectures with private instances define _HAVE_ARCH_CSUM_AND_COPY in their asm/checksum.h and have the default one right in net/checksum.h conditional on _HAVE_ARCH_CSUM_AND_COPY *not* defined. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
75 lines
2.0 KiB
C
75 lines
2.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _ALPHA_CHECKSUM_H
|
|
#define _ALPHA_CHECKSUM_H
|
|
|
|
#include <linux/in6.h>
|
|
|
|
/*
|
|
* This is a version of ip_compute_csum() optimized for IP headers,
|
|
* which always checksum on 4 octet boundaries.
|
|
*/
|
|
extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
|
|
|
|
/*
|
|
* computes the checksum of the TCP/UDP pseudo-header
|
|
* returns a 16-bit checksum, already complemented
|
|
*/
|
|
__sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
|
|
__u32 len, __u8 proto, __wsum sum);
|
|
|
|
__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
|
|
__u32 len, __u8 proto, __wsum sum);
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
extern __wsum csum_partial(const void *buff, int len, __wsum sum);
|
|
|
|
/*
|
|
* the same as csum_partial, but copies from src while it
|
|
* checksums
|
|
*
|
|
* here even more important to align src and dst on a 32-bit (or even
|
|
* better 64-bit) boundary
|
|
*/
|
|
#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER
|
|
#define _HAVE_ARCH_CSUM_AND_COPY
|
|
__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
|
|
|
|
__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
|
|
|
|
|
|
/*
|
|
* this routine is used for miscellaneous IP-like checksums, mainly
|
|
* in icmp.c
|
|
*/
|
|
|
|
extern __sum16 ip_compute_csum(const void *buff, int len);
|
|
|
|
/*
|
|
* Fold a partial checksum without adding pseudo headers
|
|
*/
|
|
|
|
static inline __sum16 csum_fold(__wsum csum)
|
|
{
|
|
u32 sum = (__force u32)csum;
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
sum = (sum & 0xffff) + (sum >> 16);
|
|
return (__force __sum16)~sum;
|
|
}
|
|
|
|
#define _HAVE_ARCH_IPV6_CSUM
|
|
extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr,
|
|
__u32 len, __u8 proto, __wsum sum);
|
|
#endif
|