arch/arm64/include/asm/checksum.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2016 ARM Ltd.
   4  */
   5 #ifndef __ASM_CHECKSUM_H
   6 #define __ASM_CHECKSUM_H
   7
   8 #include <linux/in6.h>
   9
  10 #define _HAVE_ARCH_IPV6_CSUM
  11 __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
  12                         const struct in6_addr *daddr,
  13                         __u32 len, __u8 proto, __wsum sum);
  14
  15 static inline __sum16 csum_fold(__wsum csum)
  16 {
  17         u32 sum = (__force u32)csum;
  18         sum += (sum >> 16) | (sum << 16);
  19         return ~(__force __sum16)(sum >> 16);
  20 }
  21 #define csum_fold csum_fold
  22
  23 static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
  24 {
  25         __uint128_t tmp;
  26         u64 sum;
  27         int n = ihl; /* we want it signed */
  28
  29         tmp = *(const __uint128_t *)iph;
  30         iph += 16;
  31         n -= 4;
  32         tmp += ((tmp >> 64) | (tmp << 64));
  33         sum = tmp >> 64;
  34         do {
  35                 sum += *(const u32 *)iph;
  36                 iph += 4;
  37         } while (--n > 0);
  38
  39         sum += ((sum >> 32) | (sum << 32));
  40         return csum_fold((__force u32)(sum >> 32));
  41 }
  42 #define ip_fast_csum ip_fast_csum
  43
  44 extern unsigned int do_csum(const unsigned char *buff, int len);
  45 #define do_csum do_csum
  46
  47 #include <asm-generic/checksum.h>
  48
  49 #endif  /* __ASM_CHECKSUM_H */