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 unsigned short len, 21 unsigned short proto, 22 __wsum sum); 23 24 extern __wsum csum_tcpudp_nofold (__be32 saddr, __be32 daddr, 25 unsigned short len, 26 unsigned short proto, 27 __wsum sum); 28 29 /* 30 * Computes the checksum of a memory block at buff, length len, 31 * and adds in "sum" (32-bit) 32 * 33 * returns a 32-bit number suitable for feeding into itself 34 * or csum_tcpudp_magic 35 * 36 * this function must be called with even lengths, except 37 * for the last fragment, which may be odd 38 * 39 * it's best to have buff aligned on a 32-bit boundary 40 */ 41 extern __wsum csum_partial(const void *buff, int len, __wsum sum); 42 43 /* 44 * Same as csum_partial, but copies from src while it checksums. 45 * 46 * Here it is even more important to align src and dst on a 32-bit (or 47 * even better 64-bit) boundary. 48 */ 49 extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst, 50 int len, __wsum sum, 51 int *errp); 52 53 extern __wsum csum_partial_copy_nocheck(const void *src, void *dst, 54 int len, __wsum sum); 55 56 /* 57 * This routine is used for miscellaneous IP-like checksums, mainly in 58 * icmp.c 59 */ 60 extern __sum16 ip_compute_csum(const void *buff, int len); 61 62 /* 63 * Fold a partial checksum without adding pseudo headers. 64 */ 65 static inline __sum16 csum_fold(__wsum csum) 66 { 67 u32 sum = (__force u32)csum; 68 sum = (sum & 0xffff) + (sum >> 16); 69 sum = (sum & 0xffff) + (sum >> 16); 70 return (__force __sum16)~sum; 71 } 72 73 #define _HAVE_ARCH_IPV6_CSUM 1 74 struct in6_addr; 75 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 76 const struct in6_addr *daddr, __u32 len, unsigned short proto, 77 __wsum csum); 78 79 #endif /* _ASM_IA64_CHECKSUM_H */ 80