LXR linux/arch/ia64/include/asm/checksum.h

   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 */
  13extern __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 */
  19extern __sum16 csum_tcpudp_magic (__be32 saddr, __be32 daddr,
  20                                             unsigned short len,
  21                                             unsigned short proto,
  22                                             __wsum sum);
  23
  24extern __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 */
  41extern __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 */
  49extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
  50                                                 int len, __wsum sum,
  51                                                 int *errp);
  52
  53extern __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 */
  60extern __sum16 ip_compute_csum(const void *buff, int len);
  61
  62/*
  63 * Fold a partial checksum without adding pseudo headers.
  64 */
  65static 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
  74struct in6_addr;
  75extern __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