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                                 __u32 len, __u8 proto, __wsum sum);
  21
  22extern __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
  23                                 __u32 len, __u8 proto, __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 */
  37extern __wsum csum_partial(const void *buff, int len, __wsum sum);
  38
  39/*
  40 * Same as csum_partial, but copies from src while it checksums.
  41 *
  42 * Here it is even more important to align src and dst on a 32-bit (or
  43 * even better 64-bit) boundary.
  44 */
  45extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
  46                                                 int len, __wsum sum,
  47                                                 int *errp);
  48
  49extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
  50                                               int len, __wsum sum);
  51
  52/*
  53 * This routine is used for miscellaneous IP-like checksums, mainly in
  54 * icmp.c
  55 */
  56extern __sum16 ip_compute_csum(const void *buff, int len);
  57
  58/*
  59 * Fold a partial checksum without adding pseudo headers.
  60 */
  61static inline __sum16 csum_fold(__wsum csum)
  62{
  63        u32 sum = (__force u32)csum;
  64        sum = (sum & 0xffff) + (sum >> 16);
  65        sum = (sum & 0xffff) + (sum >> 16);
  66        return (__force __sum16)~sum;
  67}
  68
  69#define _HAVE_ARCH_IPV6_CSUM    1
  70struct in6_addr;
  71extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
  72                               const struct in6_addr *daddr,
  73                               __u32 len, __u8 proto, __wsum csum);
  74
  75#endif /* _ASM_IA64_CHECKSUM_H */
  76