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 * This routine is used for miscellaneous IP-like checksums, mainly in 42 * icmp.c 43 */ 44 extern __sum16 ip_compute_csum(const void *buff, int len); 45 46 /* 47 * Fold a partial checksum without adding pseudo headers. 48 */ 49 static inline __sum16 csum_fold(__wsum csum) 50 { 51 u32 sum = (__force u32)csum; 52 sum = (sum & 0xffff) + (sum >> 16); 53 sum = (sum & 0xffff) + (sum >> 16); 54 return (__force __sum16)~sum; 55 } 56 57 #define _HAVE_ARCH_IPV6_CSUM 1 58 struct in6_addr; 59 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 60 const struct in6_addr *daddr, 61 __u32 len, __u8 proto, __wsum csum); 62 63 #endif /* _ASM_IA64_CHECKSUM_H */ 64