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1 | #ifndef _ASM_IA64_CHECKSUM_H |
2 | #define _ASM_IA64_CHECKSUM_H | |
3 | ||
4 | /* | |
5 | * Modified 1998, 1999 | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com>, Hewlett-Packard Co | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This is a version of ip_compute_csum() optimized for IP headers, | |
11 | * which always checksum on 4 octet boundaries. | |
12 | */ | |
13 | extern unsigned short ip_fast_csum (unsigned char * iph, unsigned int ihl); | |
14 | ||
15 | /* | |
16 | * Computes the checksum of the TCP/UDP pseudo-header returns a 16-bit | |
17 | * checksum, already complemented | |
18 | */ | |
19 | extern unsigned short int csum_tcpudp_magic (unsigned long saddr, | |
20 | unsigned long daddr, | |
21 | unsigned short len, | |
22 | unsigned short proto, | |
23 | unsigned int sum); | |
24 | ||
25 | extern unsigned int csum_tcpudp_nofold (unsigned long saddr, | |
26 | unsigned long daddr, | |
27 | unsigned short len, | |
28 | unsigned short proto, | |
29 | unsigned int sum); | |
30 | ||
31 | /* | |
32 | * Computes the checksum of a memory block at buff, length len, | |
33 | * and adds in "sum" (32-bit) | |
34 | * | |
35 | * returns a 32-bit number suitable for feeding into itself | |
36 | * or csum_tcpudp_magic | |
37 | * | |
38 | * this function must be called with even lengths, except | |
39 | * for the last fragment, which may be odd | |
40 | * | |
41 | * it's best to have buff aligned on a 32-bit boundary | |
42 | */ | |
43 | extern unsigned int csum_partial (const unsigned char * buff, int len, | |
44 | unsigned int sum); | |
45 | ||
46 | /* | |
47 | * Same as csum_partial, but copies from src while it checksums. | |
48 | * | |
49 | * Here it is even more important to align src and dst on a 32-bit (or | |
50 | * even better 64-bit) boundary. | |
51 | */ | |
52 | extern unsigned int csum_partial_copy_from_user (const char *src, char *dst, | |
53 | int len, unsigned int sum, | |
54 | int *errp); | |
55 | ||
56 | extern unsigned int csum_partial_copy_nocheck (const char *src, char *dst, | |
57 | int len, unsigned int sum); | |
58 | ||
59 | /* | |
60 | * This routine is used for miscellaneous IP-like checksums, mainly in | |
61 | * icmp.c | |
62 | */ | |
63 | extern unsigned short ip_compute_csum (unsigned char *buff, int len); | |
64 | ||
65 | /* | |
66 | * Fold a partial checksum without adding pseudo headers. | |
67 | */ | |
68 | static inline unsigned short | |
69 | csum_fold (unsigned int sum) | |
70 | { | |
71 | sum = (sum & 0xffff) + (sum >> 16); | |
72 | sum = (sum & 0xffff) + (sum >> 16); | |
73 | return ~sum; | |
74 | } | |
75 | ||
76 | #endif /* _ASM_IA64_CHECKSUM_H */ |