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 extern __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, 17 unsigned short len, 18 unsigned short proto, 19 __wsum sum); 20 21 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, 22 unsigned short len, unsigned short proto, 23 __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 * the same as csum_partial, but copies from src while it 41 * checksums 42 * 43 * here even more important to align src and dst on a 32-bit (or even 44 * better 64-bit) boundary 45 */ 46 __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp); 47 48 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum); 49 50 51 /* 52 * this routine is used for miscellaneous IP-like checksums, mainly 53 * in icmp.c 54 */ 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 62 static inline __sum16 csum_fold(__wsum csum) 63 { 64 u32 sum = (__force u32)csum; 65 sum = (sum & 0xffff) + (sum >> 16); 66 sum = (sum & 0xffff) + (sum >> 16); 67 return (__force __sum16)~sum; 68 } 69 70 #define _HAVE_ARCH_IPV6_CSUM 71 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 72 const struct in6_addr *daddr, 73 __u32 len, unsigned short proto, 74 __wsum sum); 75 #endif 76