| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef _ASM_IA64_CHECKSUM_H |
| #define _ASM_IA64_CHECKSUM_H |
| |
| /* |
| * Modified 1998, 1999 |
| * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co |
| */ |
| |
| /* |
| * 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 |
| */ |
| extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
| __u32 len, __u8 proto, __wsum sum); |
| |
| extern __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); |
| |
| /* |
| * 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 1 |
| struct in6_addr; |
| extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| const struct in6_addr *daddr, |
| __u32 len, __u8 proto, __wsum csum); |
| |
| #endif /* _ASM_IA64_CHECKSUM_H */ |
