62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
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/*
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* Licensed under the GPL
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*/
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#ifndef __UM_SYSDEP_CHECKSUM_H
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#define __UM_SYSDEP_CHECKSUM_H
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static inline __sum16 ip_compute_csum(const void *buff, int len)
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{
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return csum_fold (csum_partial(buff, len, 0));
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}
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#define _HAVE_ARCH_IPV6_CSUM
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static __inline__ __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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const struct in6_addr *daddr,
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__u32 len, unsigned short proto,
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__wsum sum)
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{
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__asm__(
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"addl 0(%1), %0 ;\n"
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"adcl 4(%1), %0 ;\n"
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"adcl 8(%1), %0 ;\n"
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"adcl 12(%1), %0 ;\n"
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"adcl 0(%2), %0 ;\n"
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"adcl 4(%2), %0 ;\n"
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"adcl 8(%2), %0 ;\n"
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"adcl 12(%2), %0 ;\n"
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"adcl %3, %0 ;\n"
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"adcl %4, %0 ;\n"
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"adcl $0, %0 ;\n"
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: "=&r" (sum)
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: "r" (saddr), "r" (daddr),
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"r"(htonl(len)), "r"(htonl(proto)), "0"(sum));
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return csum_fold(sum);
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}
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/*
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* Copy and checksum to user
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*/
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#define HAVE_CSUM_COPY_USER
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static __inline__ __wsum csum_and_copy_to_user(const void *src,
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void __user *dst,
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int len, __wsum sum, int *err_ptr)
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{
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if (access_ok(VERIFY_WRITE, dst, len)) {
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if (copy_to_user(dst, src, len)) {
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*err_ptr = -EFAULT;
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return (__force __wsum)-1;
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}
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return csum_partial(src, len, sum);
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}
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if (len)
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*err_ptr = -EFAULT;
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return (__force __wsum)-1; /* invalid checksum */
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}
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#endif
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