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 28 tmp = *(const __uint128_t *)iph; 29 iph += 16; 30 ihl -= 4; 31 tmp += ((tmp >> 64) | (tmp << 64)); 32 sum = tmp >> 64; 33 do { 34 sum += *(const u32 *)iph; 35 iph += 4; 36 } while (--ihl); 37 38 sum += ((sum >> 32) | (sum << 32)); 39 return csum_fold((__force u32)(sum >> 32)); 40 } 41 #define ip_fast_csum ip_fast_csum 42 43 extern unsigned int do_csum(const unsigned char *buff, int len); 44 #define do_csum do_csum 45 46 #include <asm-generic/checksum.h> 47 48 #endif /* __ASM_CHECKSUM_H */ 49