home *** CD-ROM | disk | FTP | other *** search
- #ifndef _ALPHA_CHECKSUM_H
- #define _ALPHA_CHECKSUM_H
-
-
- /*
- * This is a version of ip_compute_csum() optimized for IP headers,
- * which always checksum on 4 octet boundaries.
- */
- extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
-
- /*
- * computes the checksum of the TCP/UDP pseudo-header
- * returns a 16-bit checksum, already complemented
- */
- extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
- unsigned long daddr,
- unsigned short len,
- unsigned short proto,
- unsigned int sum);
-
- unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
- unsigned short len, unsigned short proto,
- unsigned int sum);
-
- /*
- * computes the checksum of a memory block at buff, length len,
- * and adds in "sum" (32-bit)
- *
- * returns a 32-bit number suitable for feeding into itself
- * or csum_tcpudp_magic
- *
- * this function must be called with even lengths, except
- * for the last fragment, which may be odd
- *
- * it's best to have buff aligned on a 32-bit boundary
- */
- extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
-
- /*
- * the same as csum_partial, but copies from src while it
- * checksums
- *
- * here even more important to align src and dst on a 32-bit (or even
- * better 64-bit) boundary
- */
- unsigned int csum_partial_copy(const char *src, char *dst, int len, unsigned int sum);
-
- /*
- * the same as csum_partial, but copies from user space (but on the alpha
- * we have just one address space, so this is identical to the above)
- *
- * this is obsolete and will go away.
- */
- #define csum_partial_copy_fromuser csum_partial_copy
-
- /*
- * this is a new version of the above that records errors it finds in *errp,
- * but continues and zeros the rest of the buffer.
- */
- unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *errp);
-
- unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
-
-
- /*
- * this routine is used for miscellaneous IP-like checksums, mainly
- * in icmp.c
- */
-
- extern unsigned short ip_compute_csum(unsigned char * buff, int len);
-
- /*
- * Fold a partial checksum without adding pseudo headers
- */
-
- static inline unsigned short csum_fold(unsigned int sum)
- {
- sum = (sum & 0xffff) + (sum >> 16);
- sum = (sum & 0xffff) + (sum >> 16);
- return ~sum;
- }
-
- #define _HAVE_ARCH_IPV6_CSUM
- extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
- struct in6_addr *daddr,
- __u16 len,
- unsigned short proto,
- unsigned int sum);
-
- #endif
-