1 #ifndef _ALPHA_CHECKSUM_H
2 #define _ALPHA_CHECKSUM_H
6 * This is a version of ip_compute_csum() optimized for IP headers,
7 * which always checksum on 4 octet boundaries.
9 extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
12 * computes the checksum of the TCP/UDP pseudo-header
13 * returns a 16-bit checksum, already complemented
15 extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
21 unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
22 unsigned short len, unsigned short proto,
26 * computes the checksum of a memory block at buff, length len,
27 * and adds in "sum" (32-bit)
29 * returns a 32-bit number suitable for feeding into itself
30 * or csum_tcpudp_magic
32 * this function must be called with even lengths, except
33 * for the last fragment, which may be odd
35 * it's best to have buff aligned on a 32-bit boundary
37 extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
40 * the same as csum_partial, but copies from src while it
43 * here even more important to align src and dst on a 32-bit (or even
44 * better 64-bit) boundary
46 unsigned int csum_partial_copy_from_user(const char __user *src, char *dst, int len, unsigned int sum, int *errp);
48 unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
52 * this routine is used for miscellaneous IP-like checksums, mainly
56 extern unsigned short ip_compute_csum(unsigned char * buff, int len);
59 * Fold a partial checksum without adding pseudo headers
62 static inline unsigned short csum_fold(unsigned int sum)
64 sum = (sum & 0xffff) + (sum >> 16);
65 sum = (sum & 0xffff) + (sum >> 16);
69 #define _HAVE_ARCH_IPV6_CSUM
70 extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
71 struct in6_addr *daddr,