| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_IA64_CHECKSUM_H |
| 3 | #define _ASM_IA64_CHECKSUM_H |
| 4 | |
| 5 | /* |
| 6 | * Modified 1998, 1999 |
| 7 | * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 12 | * which always checksum on 4 octet boundaries. |
| 13 | */ |
| 14 | extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
| 15 | |
| 16 | /* |
| 17 | * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit |
| 18 | * checksum, already complemented |
| 19 | */ |
| 20 | extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| 21 | __u32 len, __u8 proto, __wsum sum); |
| 22 | |
| 23 | extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
| 24 | __u32 len, __u8 proto, __wsum sum); |
| 25 | |
| 26 | /* |
| 27 | * Computes the checksum of a memory block at buff, length len, |
| 28 | * and adds in "sum" (32-bit) |
| 29 | * |
| 30 | * returns a 32-bit number suitable for feeding into itself |
| 31 | * or csum_tcpudp_magic |
| 32 | * |
| 33 | * this function must be called with even lengths, except |
| 34 | * for the last fragment, which may be odd |
| 35 | * |
| 36 | * it's best to have buff aligned on a 32-bit boundary |
| 37 | */ |
| 38 | extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
| 39 | |
| 40 | /* |
| 41 | * Same as csum_partial, but copies from src while it checksums. |
| 42 | * |
| 43 | * Here it is even more important to align src and dst on a 32-bit (or |
| 44 | * even better 64-bit) boundary. |
| 45 | */ |
| 46 | extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, |
| 47 | int len, __wsum sum, |
| 48 | int *errp); |
| 49 | |
| 50 | extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
| 51 | int len, __wsum sum); |
| 52 | |
| 53 | /* |
| 54 | * This routine is used for miscellaneous IP-like checksums, mainly in |
| 55 | * icmp.c |
| 56 | */ |
| 57 | extern __sum16 ip_compute_csum(const void *buff, int len); |
| 58 | |
| 59 | /* |
| 60 | * Fold a partial checksum without adding pseudo headers. |
| 61 | */ |
| 62 | static inline __sum16 csum_fold(__wsum csum) |
| 63 | { |
| 64 | u32 sum = (__force u32)csum; |
| 65 | sum = (sum & 0xffff) + (sum >> 16); |
| 66 | sum = (sum & 0xffff) + (sum >> 16); |
| 67 | return (__force __sum16)~sum; |
| 68 | } |
| 69 | |
| 70 | #define _HAVE_ARCH_IPV6_CSUM 1 |
| 71 | struct in6_addr; |
| 72 | extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 73 | const struct in6_addr *daddr, |
| 74 | __u32 len, __u8 proto, __wsum csum); |
| 75 | |
| 76 | #endif /* _ASM_IA64_CHECKSUM_H */ |