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