diff options
Diffstat (limited to 'kernel/arch/m32r/lib/csum_partial_copy.c')
| -rw-r--r-- | kernel/arch/m32r/lib/csum_partial_copy.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/kernel/arch/m32r/lib/csum_partial_copy.c b/kernel/arch/m32r/lib/csum_partial_copy.c new file mode 100644 index 000000000..5596f3df8 --- /dev/null +++ b/kernel/arch/m32r/lib/csum_partial_copy.c @@ -0,0 +1,59 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * M32R specific IP/TCP/UDP checksumming routines + * (Some code taken from MIPS architecture) + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * Copyright (C) 1994, 1995 Waldorf Electronics GmbH + * Copyright (C) 1998, 1999 Ralf Baechle + * Copyright (C) 2001-2005 Hiroyuki Kondo, Hirokazu Takata + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/string.h> + +#include <net/checksum.h> +#include <asm/byteorder.h> +#include <asm/uaccess.h> + +/* + * Copy while checksumming, otherwise like csum_partial + */ +__wsum +csum_partial_copy_nocheck (const void *src, void *dst, int len, __wsum sum) +{ + sum = csum_partial(src, len, sum); + memcpy(dst, src, len); + + return sum; +} +EXPORT_SYMBOL(csum_partial_copy_nocheck); + +/* + * Copy from userspace and compute checksum. If we catch an exception + * then zero the rest of the buffer. + */ +__wsum +csum_partial_copy_from_user (const void __user *src, void *dst, + int len, __wsum sum, int *err_ptr) +{ + int missing; + + missing = copy_from_user(dst, src, len); + if (missing) { + memset(dst + len - missing, 0, missing); + *err_ptr = -EFAULT; + } + + return csum_partial(dst, len-missing, sum); +} +EXPORT_SYMBOL(csum_partial_copy_from_user); +EXPORT_SYMBOL(csum_partial); |