Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1995, 96, 97, 98, 99, 2001 by Ralf Baechle |
| 7 | * Copyright (C) 1999 Silicon Graphics, Inc. |
| 8 | * Copyright (C) 2001 Thiemo Seufer. |
| 9 | * Copyright (C) 2002 Maciej W. Rozycki |
Markos Chandras | ac85227 | 2013-12-12 16:21:00 +0000 | [diff] [blame] | 10 | * Copyright (C) 2014 Imagination Technologies Ltd. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | #ifndef _ASM_CHECKSUM_H |
| 13 | #define _ASM_CHECKSUM_H |
| 14 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/in6.h> |
| 16 | |
| 17 | #include <asm/uaccess.h> |
| 18 | |
| 19 | /* |
| 20 | * computes the checksum of a memory block at buff, length len, |
| 21 | * and adds in "sum" (32-bit) |
| 22 | * |
| 23 | * returns a 32-bit number suitable for feeding into itself |
| 24 | * or csum_tcpudp_magic |
| 25 | * |
| 26 | * this function must be called with even lengths, except |
| 27 | * for the last fragment, which may be odd |
| 28 | * |
| 29 | * it's best to have buff aligned on a 32-bit boundary |
| 30 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 31 | __wsum csum_partial(const void *buff, int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Markos Chandras | ac85227 | 2013-12-12 16:21:00 +0000 | [diff] [blame] | 33 | __wsum __csum_partial_copy_kernel(const void *src, void *dst, |
| 34 | int len, __wsum sum, int *err_ptr); |
| 35 | |
| 36 | __wsum __csum_partial_copy_from_user(const void *src, void *dst, |
| 37 | int len, __wsum sum, int *err_ptr); |
| 38 | __wsum __csum_partial_copy_to_user(const void *src, void *dst, |
| 39 | int len, __wsum sum, int *err_ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | /* |
| 41 | * this is a new version of the above that records errors it finds in *errp, |
| 42 | * but continues and zeros the rest of the buffer. |
| 43 | */ |
Atsushi Nemoto | f860c90 | 2006-12-13 01:22:06 +0900 | [diff] [blame] | 44 | static inline |
| 45 | __wsum csum_partial_copy_from_user(const void __user *src, void *dst, int len, |
| 46 | __wsum sum, int *err_ptr) |
| 47 | { |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 48 | might_fault(); |
Leonid Yegoshin | fb31691 | 2013-12-19 17:09:17 +0000 | [diff] [blame] | 49 | if (segment_eq(get_fs(), get_ds())) |
| 50 | return __csum_partial_copy_kernel((__force void *)src, dst, |
| 51 | len, sum, err_ptr); |
| 52 | else |
| 53 | return __csum_partial_copy_from_user((__force void *)src, dst, |
| 54 | len, sum, err_ptr); |
Atsushi Nemoto | f860c90 | 2006-12-13 01:22:06 +0900 | [diff] [blame] | 55 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Leonid Yegoshin | c2d85bc | 2013-12-17 09:30:13 +0000 | [diff] [blame] | 57 | #define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
| 58 | static inline |
| 59 | __wsum csum_and_copy_from_user(const void __user *src, void *dst, |
| 60 | int len, __wsum sum, int *err_ptr) |
| 61 | { |
| 62 | if (access_ok(VERIFY_READ, src, len)) |
| 63 | return csum_partial_copy_from_user(src, dst, len, sum, |
| 64 | err_ptr); |
| 65 | if (len) |
| 66 | *err_ptr = -EFAULT; |
| 67 | |
| 68 | return sum; |
| 69 | } |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | /* |
| 72 | * Copy and checksum to user |
| 73 | */ |
| 74 | #define HAVE_CSUM_COPY_USER |
Atsushi Nemoto | f860c90 | 2006-12-13 01:22:06 +0900 | [diff] [blame] | 75 | static inline |
| 76 | __wsum csum_and_copy_to_user(const void *src, void __user *dst, int len, |
| 77 | __wsum sum, int *err_ptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | { |
Ralf Baechle | ef41f46 | 2009-04-28 14:17:54 +0200 | [diff] [blame] | 79 | might_fault(); |
Leonid Yegoshin | fb31691 | 2013-12-19 17:09:17 +0000 | [diff] [blame] | 80 | if (access_ok(VERIFY_WRITE, dst, len)) { |
| 81 | if (segment_eq(get_fs(), get_ds())) |
| 82 | return __csum_partial_copy_kernel(src, |
| 83 | (__force void *)dst, |
| 84 | len, sum, err_ptr); |
| 85 | else |
| 86 | return __csum_partial_copy_to_user(src, |
| 87 | (__force void *)dst, |
| 88 | len, sum, err_ptr); |
| 89 | } |
Atsushi Nemoto | f860c90 | 2006-12-13 01:22:06 +0900 | [diff] [blame] | 90 | if (len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | *err_ptr = -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Atsushi Nemoto | f860c90 | 2006-12-13 01:22:06 +0900 | [diff] [blame] | 93 | return (__force __wsum)-1; /* invalid checksum */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | /* |
| 97 | * the same as csum_partial, but copies from user space (but on MIPS |
| 98 | * we have just one address space, so this is identical to the above) |
| 99 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 100 | __wsum csum_partial_copy_nocheck(const void *src, void *dst, |
| 101 | int len, __wsum sum); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * Fold a partial checksum without adding pseudo headers |
| 105 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 106 | static inline __sum16 csum_fold(__wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
| 108 | __asm__( |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 109 | " .set push # csum_fold\n" |
| 110 | " .set noat \n" |
| 111 | " sll $1, %0, 16 \n" |
| 112 | " addu %0, $1 \n" |
| 113 | " sltu $1, %0, $1 \n" |
| 114 | " srl %0, %0, 16 \n" |
| 115 | " addu %0, $1 \n" |
| 116 | " xori %0, 0xffff \n" |
| 117 | " .set pop" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | : "=r" (sum) |
| 119 | : "0" (sum)); |
| 120 | |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 121 | return (__force __sum16)sum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | /* |
| 125 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 126 | * which always checksum on 4 octet boundaries. |
| 127 | * |
| 128 | * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by |
| 129 | * Arnt Gulbrandsen. |
| 130 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 131 | static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 133 | const unsigned int *word = iph; |
| 134 | const unsigned int *stop = word + ihl; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | unsigned int csum; |
| 136 | int carry; |
| 137 | |
| 138 | csum = word[0]; |
| 139 | csum += word[1]; |
| 140 | carry = (csum < word[1]); |
| 141 | csum += carry; |
| 142 | |
| 143 | csum += word[2]; |
| 144 | carry = (csum < word[2]); |
| 145 | csum += carry; |
| 146 | |
| 147 | csum += word[3]; |
| 148 | carry = (csum < word[3]); |
| 149 | csum += carry; |
| 150 | |
| 151 | word += 4; |
| 152 | do { |
| 153 | csum += *word; |
| 154 | carry = (csum < *word); |
| 155 | csum += carry; |
| 156 | word++; |
| 157 | } while (word != stop); |
| 158 | |
| 159 | return csum_fold(csum); |
| 160 | } |
| 161 | |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 162 | static inline __wsum csum_tcpudp_nofold(__be32 saddr, |
| 163 | __be32 daddr, unsigned short len, unsigned short proto, |
| 164 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | { |
| 166 | __asm__( |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 167 | " .set push # csum_tcpudp_nofold\n" |
| 168 | " .set noat \n" |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 169 | #ifdef CONFIG_32BIT |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 170 | " addu %0, %2 \n" |
| 171 | " sltu $1, %0, %2 \n" |
| 172 | " addu %0, $1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 174 | " addu %0, %3 \n" |
| 175 | " sltu $1, %0, %3 \n" |
| 176 | " addu %0, $1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 178 | " addu %0, %4 \n" |
| 179 | " sltu $1, %0, %4 \n" |
| 180 | " addu %0, $1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | #endif |
Ralf Baechle | 875d43e | 2005-09-03 15:56:16 -0700 | [diff] [blame] | 182 | #ifdef CONFIG_64BIT |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 183 | " daddu %0, %2 \n" |
| 184 | " daddu %0, %3 \n" |
| 185 | " daddu %0, %4 \n" |
| 186 | " dsll32 $1, %0, 0 \n" |
| 187 | " daddu %0, $1 \n" |
Ralf Baechle | e972883 | 2005-09-20 10:56:26 +0000 | [diff] [blame] | 188 | " dsra32 %0, %0, 0 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | #endif |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 190 | " .set pop" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | : "=r" (sum) |
Atsushi Nemoto | 66218da | 2007-01-24 15:43:34 +0900 | [diff] [blame] | 192 | : "0" ((__force unsigned long)daddr), |
| 193 | "r" ((__force unsigned long)saddr), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | #ifdef __MIPSEL__ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 195 | "r" ((proto + len) << 8), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | #else |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 197 | "r" (proto + len), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | #endif |
Dave Johnson | 1d464c2 | 2007-04-18 10:39:41 -0400 | [diff] [blame] | 199 | "r" ((__force unsigned long)sum)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
| 201 | return sum; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * computes the checksum of the TCP/UDP pseudo-header |
| 206 | * returns a 16-bit checksum, already complemented |
| 207 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 208 | static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | unsigned short len, |
| 210 | unsigned short proto, |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 211 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | { |
| 213 | return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * this routine is used for miscellaneous IP-like checksums, mainly |
| 218 | * in icmp.c |
| 219 | */ |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 220 | static inline __sum16 ip_compute_csum(const void *buff, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | { |
| 222 | return csum_fold(csum_partial(buff, len, 0)); |
| 223 | } |
| 224 | |
| 225 | #define _HAVE_ARCH_IPV6_CSUM |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 226 | static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
Ralf Baechle | 7034228 | 2013-01-22 12:59:30 +0100 | [diff] [blame] | 227 | const struct in6_addr *daddr, |
Al Viro | 8e3d843 | 2006-11-14 21:18:18 -0800 | [diff] [blame] | 228 | __u32 len, unsigned short proto, |
| 229 | __wsum sum) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
| 231 | __asm__( |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 232 | " .set push # csum_ipv6_magic\n" |
| 233 | " .set noreorder \n" |
| 234 | " .set noat \n" |
| 235 | " addu %0, %5 # proto (long in network byte order)\n" |
| 236 | " sltu $1, %0, %5 \n" |
| 237 | " addu %0, $1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 239 | " addu %0, %6 # csum\n" |
| 240 | " sltu $1, %0, %6 \n" |
| 241 | " lw %1, 0(%2) # four words source address\n" |
| 242 | " addu %0, $1 \n" |
| 243 | " addu %0, %1 \n" |
| 244 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 246 | " lw %1, 4(%2) \n" |
| 247 | " addu %0, $1 \n" |
| 248 | " addu %0, %1 \n" |
| 249 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 251 | " lw %1, 8(%2) \n" |
| 252 | " addu %0, $1 \n" |
| 253 | " addu %0, %1 \n" |
| 254 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 256 | " lw %1, 12(%2) \n" |
| 257 | " addu %0, $1 \n" |
| 258 | " addu %0, %1 \n" |
| 259 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 261 | " lw %1, 0(%3) \n" |
| 262 | " addu %0, $1 \n" |
| 263 | " addu %0, %1 \n" |
| 264 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 266 | " lw %1, 4(%3) \n" |
| 267 | " addu %0, $1 \n" |
| 268 | " addu %0, %1 \n" |
| 269 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 271 | " lw %1, 8(%3) \n" |
| 272 | " addu %0, $1 \n" |
| 273 | " addu %0, %1 \n" |
| 274 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 276 | " lw %1, 12(%3) \n" |
| 277 | " addu %0, $1 \n" |
| 278 | " addu %0, %1 \n" |
| 279 | " sltu $1, %0, %1 \n" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
Thiemo Seufer | 04988d6f | 2005-07-08 09:17:05 +0000 | [diff] [blame] | 281 | " addu %0, $1 # Add final carry\n" |
| 282 | " .set pop" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | : "=r" (sum), "=r" (proto) |
| 284 | : "r" (saddr), "r" (daddr), |
| 285 | "0" (htonl(len)), "1" (htonl(proto)), "r" (sum)); |
| 286 | |
| 287 | return csum_fold(sum); |
| 288 | } |
| 289 | |
| 290 | #endif /* _ASM_CHECKSUM_H */ |