1 #ifndef _ALPHA_CHECKSUM_H 2 #define _ALPHA_CHECKSUM_H 3 4 #include <linux/in6.h> 5 6 /* 7 * This is a version of ip_compute_csum() optimized for IP headers, 8 * which always checksum on 4 octet boundaries. 9 */ 10 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); 11 12 /* 13 * computes the checksum of the TCP/UDP pseudo-header 14 * returns a 16-bit checksum, already complemented 15 */ 16 __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, 17 __u32 len, __u8 proto, __wsum sum); 18 19 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, 20 __u32 len, __u8 proto, __wsum sum); 21 22 /* 23 * computes the checksum of a memory block at buff, length len, 24 * and adds in "sum" (32-bit) 25 * 26 * returns a 32-bit number suitable for feeding into itself 27 * or csum_tcpudp_magic 28 * 29 * this function must be called with even lengths, except 30 * for the last fragment, which may be odd 31 * 32 * it's best to have buff aligned on a 32-bit boundary 33 */ 34 extern __wsum csum_partial(const void *buff, int len, __wsum sum); 35 36 /* 37 * the same as csum_partial, but copies from src while it 38 * checksums 39 * 40 * here even more important to align src and dst on a 32-bit (or even 41 * better 64-bit) boundary 42 */ 43 __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp); 44 45 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); 46 47 48 /* 49 * this routine is used for miscellaneous IP-like checksums, mainly 50 * in icmp.c 51 */ 52 53 extern __sum16 ip_compute_csum(const void *buff, int len); 54 55 /* 56 * Fold a partial checksum without adding pseudo headers 57 */ 58 59 static inline __sum16 csum_fold(__wsum csum) 60 { 61 u32 sum = (__force u32)csum; 62 sum = (sum & 0xffff) + (sum >> 16); 63 sum = (sum & 0xffff) + (sum >> 16); 64 return (__force __sum16)~sum; 65 } 66 67 #define _HAVE_ARCH_IPV6_CSUM 68 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 69 const struct in6_addr *daddr, 70 __u32 len, __u8 proto, __wsum sum); 71 #endif 72