1 #ifndef _M68K_CHECKSUM_H
2 #define _M68K_CHECKSUM_H
7 * computes the checksum of a memory block at buff, length len,
8 * and adds in "sum" (32-bit)
10 * returns a 32-bit number suitable for feeding into itself
11 * or csum_tcpudp_magic
13 * this function must be called with even lengths, except
14 * for the last fragment, which may be odd
16 * it's best to have buff aligned on a 32-bit boundary
18 unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum);
21 * the same as csum_partial, but copies from src while it
24 * here even more important to align src and dst on a 32-bit (or even
25 * better 64-bit) boundary
28 extern unsigned int csum_partial_copy_from_user(const unsigned char *src,
33 extern unsigned int csum_partial_copy_nocheck(const unsigned char *src,
34 unsigned char *dst, int len,
38 * This is a version of ip_compute_csum() optimized for IP headers,
39 * which always checksum on 4 octet boundaries.
42 static inline unsigned short
43 ip_fast_csum(unsigned char *iph, unsigned int ihl)
47 __asm__ ("subqw #1,%2\n"
57 : "=d" (sum), "=a" (iph), "=d" (ihl)
58 : "0" (sum), "1" (iph), "2" (ihl)
64 * Fold a partial checksum
67 static inline unsigned int csum_fold(unsigned int sum)
69 unsigned int tmp = sum;
74 : "=&d" (sum), "=&d" (tmp)
75 : "0" (sum), "1" (sum));
81 * computes the checksum of the TCP/UDP pseudo-header
82 * returns a 16-bit checksum, already complemented
85 static inline unsigned int
86 csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, unsigned short len,
87 unsigned short proto, unsigned int sum)
89 __asm__ ("addl %1,%0\n\t"
94 : "=&d" (sum), "=&d" (saddr)
95 : "0" (daddr), "1" (saddr), "d" (len + proto),
100 static inline unsigned short int
101 csum_tcpudp_magic(unsigned long saddr, unsigned long daddr, unsigned short len,
102 unsigned short proto, unsigned int sum)
104 return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
108 * this routine is used for miscellaneous IP-like checksums, mainly
112 static inline unsigned short
113 ip_compute_csum(unsigned char * buff, int len)
115 return csum_fold (csum_partial(buff, len, 0));
118 #define _HAVE_ARCH_IPV6_CSUM
119 static __inline__ unsigned short int
120 csum_ipv6_magic(struct in6_addr *saddr, struct in6_addr *daddr,
121 __u32 len, unsigned short proto, unsigned int sum)
123 register unsigned long tmp;
124 __asm__("addl %2@,%0\n\t"
125 "movel %2@(4),%1\n\t"
127 "movel %2@(8),%1\n\t"
129 "movel %2@(12),%1\n\t"
133 "movel %3@(4),%1\n\t"
135 "movel %3@(8),%1\n\t"
137 "movel %3@(12),%1\n\t"
142 : "=&d" (sum), "=&d" (tmp)
143 : "a" (saddr), "a" (daddr), "d" (len + proto),
146 return csum_fold(sum);
149 #endif /* _M68K_CHECKSUM_H */