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Linux/arch/alpha/include/asm/checksum.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ALPHA_CHECKSUM_H
  3 #define _ALPHA_CHECKSUM_H
  4 
  5 #include <linux/in6.h>
  6 
  7 /*
  8  *      This is a version of ip_compute_csum() optimized for IP headers,
  9  *      which always checksum on 4 octet boundaries.
 10  */
 11 extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl);
 12 
 13 /*
 14  * computes the checksum of the TCP/UDP pseudo-header
 15  * returns a 16-bit checksum, already complemented
 16  */
 17 __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
 18                           __u32 len, __u8 proto, __wsum sum);
 19 
 20 __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr,
 21                           __u32 len, __u8 proto, __wsum sum);
 22 
 23 /*
 24  * computes the checksum of a memory block at buff, length len,
 25  * and adds in "sum" (32-bit)
 26  *
 27  * returns a 32-bit number suitable for feeding into itself
 28  * or csum_tcpudp_magic
 29  *
 30  * this function must be called with even lengths, except
 31  * for the last fragment, which may be odd
 32  *
 33  * it's best to have buff aligned on a 32-bit boundary
 34  */
 35 extern __wsum csum_partial(const void *buff, int len, __wsum sum);
 36 
 37 /*
 38  * the same as csum_partial, but copies from src while it
 39  * checksums
 40  *
 41  * here even more important to align src and dst on a 32-bit (or even
 42  * better 64-bit) boundary
 43  */
 44 __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, __wsum sum, int *errp);
 45 
 46 __wsum csum_partial_copy_nocheck(const void *src, void *dst, int len, __wsum sum);
 47 
 48 
 49 /*
 50  * this routine is used for miscellaneous IP-like checksums, mainly
 51  * in icmp.c
 52  */
 53 
 54 extern __sum16 ip_compute_csum(const void *buff, int len);
 55 
 56 /*
 57  *      Fold a partial checksum without adding pseudo headers
 58  */
 59 
 60 static inline __sum16 csum_fold(__wsum csum)
 61 {
 62         u32 sum = (__force u32)csum;
 63         sum = (sum & 0xffff) + (sum >> 16);
 64         sum = (sum & 0xffff) + (sum >> 16);
 65         return (__force __sum16)~sum;
 66 }
 67 
 68 #define _HAVE_ARCH_IPV6_CSUM
 69 extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
 70                                const struct in6_addr *daddr,
 71                                __u32 len, __u8 proto, __wsum sum);
 72 #endif
 73 

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