Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* $Id: checksum.h,v 1.19 2002/02/09 19:49:31 davem Exp $ */ |
2 | #ifndef __SPARC64_CHECKSUM_H | |
3 | #define __SPARC64_CHECKSUM_H | |
4 | ||
5 | /* checksum.h: IP/UDP/TCP checksum routines on the V9. | |
6 | * | |
7 | * Copyright(C) 1995 Linus Torvalds | |
8 | * Copyright(C) 1995 Miguel de Icaza | |
9 | * Copyright(C) 1996 David S. Miller | |
10 | * Copyright(C) 1996 Eddie C. Dost | |
11 | * Copyright(C) 1997 Jakub Jelinek | |
12 | * | |
13 | * derived from: | |
14 | * Alpha checksum c-code | |
15 | * ix86 inline assembly | |
16 | * RFC1071 Computing the Internet Checksum | |
17 | */ | |
18 | ||
19 | #include <linux/in6.h> | |
20 | #include <asm/uaccess.h> | |
21 | ||
22 | /* computes the checksum of a memory block at buff, length len, | |
23 | * and adds in "sum" (32-bit) | |
24 | * | |
25 | * returns a 32-bit number suitable for feeding into itself | |
26 | * or csum_tcpudp_magic | |
27 | * | |
28 | * this function must be called with even lengths, except | |
29 | * for the last fragment, which may be odd | |
30 | * | |
31 | * it's best to have buff aligned on a 32-bit boundary | |
32 | */ | |
33 | extern unsigned int csum_partial(const unsigned char * buff, int len, unsigned int sum); | |
34 | ||
35 | /* the same as csum_partial, but copies from user space while it | |
36 | * checksums | |
37 | * | |
38 | * here even more important to align src and dst on a 32-bit (or even | |
39 | * better 64-bit) boundary | |
40 | */ | |
41 | extern unsigned int csum_partial_copy_nocheck(const unsigned char *src, | |
42 | unsigned char *dst, | |
43 | int len, unsigned int sum); | |
44 | ||
45 | extern long __csum_partial_copy_from_user(const unsigned char __user *src, | |
46 | unsigned char *dst, int len, | |
47 | unsigned int sum); | |
48 | ||
49 | static inline unsigned int | |
50 | csum_partial_copy_from_user(const unsigned char __user *src, | |
51 | unsigned char *dst, int len, | |
52 | unsigned int sum, int *err) | |
53 | { | |
54 | long ret = __csum_partial_copy_from_user(src, dst, len, sum); | |
55 | if (ret < 0) | |
56 | *err = -EFAULT; | |
57 | return (unsigned int) ret; | |
58 | } | |
59 | ||
60 | /* | |
61 | * Copy and checksum to user | |
62 | */ | |
63 | #define HAVE_CSUM_COPY_USER | |
64 | extern long __csum_partial_copy_to_user(const unsigned char *src, | |
65 | unsigned char __user *dst, int len, | |
66 | unsigned int sum); | |
67 | ||
68 | static inline unsigned int | |
69 | csum_and_copy_to_user(const unsigned char *src, | |
70 | unsigned char __user *dst, int len, | |
71 | unsigned int sum, int *err) | |
72 | { | |
73 | long ret = __csum_partial_copy_to_user(src, dst, len, sum); | |
74 | if (ret < 0) | |
75 | *err = -EFAULT; | |
76 | return (unsigned int) ret; | |
77 | } | |
78 | ||
79 | /* ihl is always 5 or greater, almost always is 5, and iph is word aligned | |
80 | * the majority of the time. | |
81 | */ | |
82 | extern unsigned short ip_fast_csum(__const__ unsigned char *iph, | |
83 | unsigned int ihl); | |
84 | ||
85 | /* Fold a partial checksum without adding pseudo headers. */ | |
86 | static inline unsigned short csum_fold(unsigned int sum) | |
87 | { | |
88 | unsigned int tmp; | |
89 | ||
90 | __asm__ __volatile__( | |
91 | " addcc %0, %1, %1\n" | |
92 | " srl %1, 16, %1\n" | |
93 | " addc %1, %%g0, %1\n" | |
94 | " xnor %%g0, %1, %0\n" | |
95 | : "=&r" (sum), "=r" (tmp) | |
96 | : "0" (sum), "1" (sum<<16) | |
97 | : "cc"); | |
98 | return (sum & 0xffff); | |
99 | } | |
100 | ||
101 | static inline unsigned long csum_tcpudp_nofold(unsigned long saddr, | |
102 | unsigned long daddr, | |
103 | unsigned int len, | |
104 | unsigned short proto, | |
105 | unsigned int sum) | |
106 | { | |
107 | __asm__ __volatile__( | |
108 | " addcc %1, %0, %0\n" | |
109 | " addccc %2, %0, %0\n" | |
110 | " addccc %3, %0, %0\n" | |
111 | " addc %0, %%g0, %0\n" | |
112 | : "=r" (sum), "=r" (saddr) | |
113 | : "r" (daddr), "r" ((proto<<16)+len), "0" (sum), "1" (saddr) | |
114 | : "cc"); | |
115 | return sum; | |
116 | } | |
117 | ||
118 | /* | |
119 | * computes the checksum of the TCP/UDP pseudo-header | |
120 | * returns a 16-bit checksum, already complemented | |
121 | */ | |
122 | static inline unsigned short int csum_tcpudp_magic(unsigned long saddr, | |
123 | unsigned long daddr, | |
124 | unsigned short len, | |
125 | unsigned short proto, | |
126 | unsigned int sum) | |
127 | { | |
128 | return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum)); | |
129 | } | |
130 | ||
131 | #define _HAVE_ARCH_IPV6_CSUM | |
132 | ||
133 | static inline unsigned short int csum_ipv6_magic(struct in6_addr *saddr, | |
134 | struct in6_addr *daddr, | |
135 | __u32 len, | |
136 | unsigned short proto, | |
137 | unsigned int sum) | |
138 | { | |
139 | __asm__ __volatile__ ( | |
140 | " addcc %3, %4, %%g7\n" | |
141 | " addccc %5, %%g7, %%g7\n" | |
142 | " lduw [%2 + 0x0c], %%g2\n" | |
143 | " lduw [%2 + 0x08], %%g3\n" | |
144 | " addccc %%g2, %%g7, %%g7\n" | |
145 | " lduw [%2 + 0x04], %%g2\n" | |
146 | " addccc %%g3, %%g7, %%g7\n" | |
147 | " lduw [%2 + 0x00], %%g3\n" | |
148 | " addccc %%g2, %%g7, %%g7\n" | |
149 | " lduw [%1 + 0x0c], %%g2\n" | |
150 | " addccc %%g3, %%g7, %%g7\n" | |
151 | " lduw [%1 + 0x08], %%g3\n" | |
152 | " addccc %%g2, %%g7, %%g7\n" | |
153 | " lduw [%1 + 0x04], %%g2\n" | |
154 | " addccc %%g3, %%g7, %%g7\n" | |
155 | " lduw [%1 + 0x00], %%g3\n" | |
156 | " addccc %%g2, %%g7, %%g7\n" | |
157 | " addccc %%g3, %%g7, %0\n" | |
158 | " addc 0, %0, %0\n" | |
159 | : "=&r" (sum) | |
160 | : "r" (saddr), "r" (daddr), "r"(htonl(len)), | |
161 | "r"(htonl(proto)), "r"(sum) | |
162 | : "g2", "g3", "g7", "cc"); | |
163 | ||
164 | return csum_fold(sum); | |
165 | } | |
166 | ||
167 | /* this routine is used for miscellaneous IP-like checksums, mainly in icmp.c */ | |
168 | static inline unsigned short ip_compute_csum(unsigned char * buff, int len) | |
169 | { | |
170 | return csum_fold(csum_partial(buff, len, 0)); | |
171 | } | |
172 | ||
173 | #endif /* !(__SPARC64_CHECKSUM_H) */ |