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TOMOYO Linux Cross Reference
Linux/include/asm-alpha/checksum.h

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  1 #ifndef _ALPHA_CHECKSUM_H
  2 #define _ALPHA_CHECKSUM_H
  3 
  4 
  5 /*
  6  *      This is a version of ip_compute_csum() optimized for IP headers,
  7  *      which always checksum on 4 octet boundaries.
  8  */
  9 extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl);
 10 
 11 /*
 12  * computes the checksum of the TCP/UDP pseudo-header
 13  * returns a 16-bit checksum, already complemented
 14  */
 15 extern unsigned short int csum_tcpudp_magic(unsigned long saddr,
 16                                            unsigned long daddr,
 17                                            unsigned short len,
 18                                            unsigned short proto,
 19                                            unsigned int sum);
 20 
 21 unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr,
 22                                 unsigned short len, unsigned short proto,
 23                                 unsigned int 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 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int 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 unsigned int csum_partial_copy_from_user(const char *src, char *dst, int len, unsigned int sum, int *errp);
 47 
 48 unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum);
 49 
 50 
 51 /*
 52  * this routine is used for miscellaneous IP-like checksums, mainly
 53  * in icmp.c
 54  */
 55 
 56 extern unsigned short ip_compute_csum(unsigned char * buff, int len);
 57 
 58 /*
 59  *      Fold a partial checksum without adding pseudo headers
 60  */
 61 
 62 static inline unsigned short csum_fold(unsigned int sum)
 63 {
 64         sum = (sum & 0xffff) + (sum >> 16);
 65         sum = (sum & 0xffff) + (sum >> 16);
 66         return ~sum;
 67 }
 68 
 69 #define _HAVE_ARCH_IPV6_CSUM
 70 extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr,
 71                                           struct in6_addr *daddr,
 72                                           __u32 len,
 73                                           unsigned short proto,
 74                                           unsigned int sum);
 75 
 76 #endif
 77 

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