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1da177e4 LT |
1 | #ifndef _ALPHA_CHECKSUM_H |
2 | #define _ALPHA_CHECKSUM_H | |
3 | ||
4 | #include <linux/in6.h> | |
5 | ||
6 | /* | |
7 | * This is a version of ip_compute_csum() optimized for IP headers, | |
8 | * which always checksum on 4 octet boundaries. | |
9 | */ | |
10 | extern unsigned short ip_fast_csum(unsigned char * iph, unsigned int ihl); | |
11 | ||
12 | /* | |
13 | * computes the checksum of the TCP/UDP pseudo-header | |
14 | * returns a 16-bit checksum, already complemented | |
15 | */ | |
16 | extern unsigned short int csum_tcpudp_magic(unsigned long saddr, | |
17 | unsigned long daddr, | |
18 | unsigned short len, | |
19 | unsigned short proto, | |
20 | unsigned int sum); | |
21 | ||
22 | unsigned int csum_tcpudp_nofold(unsigned long saddr, unsigned long daddr, | |
23 | unsigned short len, unsigned short proto, | |
24 | unsigned int sum); | |
25 | ||
26 | /* | |
27 | * computes the checksum of a memory block at buff, length len, | |
28 | * and adds in "sum" (32-bit) | |
29 | * | |
30 | * returns a 32-bit number suitable for feeding into itself | |
31 | * or csum_tcpudp_magic | |
32 | * | |
33 | * this function must be called with even lengths, except | |
34 | * for the last fragment, which may be odd | |
35 | * | |
36 | * it's best to have buff aligned on a 32-bit boundary | |
37 | */ | |
38 | extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); | |
39 | ||
40 | /* | |
41 | * the same as csum_partial, but copies from src while it | |
42 | * checksums | |
43 | * | |
44 | * here even more important to align src and dst on a 32-bit (or even | |
45 | * better 64-bit) boundary | |
46 | */ | |
47 | unsigned int csum_partial_copy_from_user(const char __user *src, char *dst, int len, unsigned int sum, int *errp); | |
48 | ||
49 | unsigned int csum_partial_copy_nocheck(const char *src, char *dst, int len, unsigned int sum); | |
50 | ||
51 | ||
52 | /* | |
53 | * this routine is used for miscellaneous IP-like checksums, mainly | |
54 | * in icmp.c | |
55 | */ | |
56 | ||
57 | extern unsigned short ip_compute_csum(unsigned char * buff, int len); | |
58 | ||
59 | /* | |
60 | * Fold a partial checksum without adding pseudo headers | |
61 | */ | |
62 | ||
63 | static inline unsigned short csum_fold(unsigned int sum) | |
64 | { | |
65 | sum = (sum & 0xffff) + (sum >> 16); | |
66 | sum = (sum & 0xffff) + (sum >> 16); | |
67 | return ~sum; | |
68 | } | |
69 | ||
70 | #define _HAVE_ARCH_IPV6_CSUM | |
71 | extern unsigned short int csum_ipv6_magic(struct in6_addr *saddr, | |
72 | struct in6_addr *daddr, | |
73 | __u32 len, | |
74 | unsigned short proto, | |
75 | unsigned int sum); | |
76 | ||
77 | #endif |