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74 lines
2.0 KiB
74 lines
2.0 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _ALPHA_CHECKSUM_H |
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#define _ALPHA_CHECKSUM_H |
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#include <linux/in6.h> |
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/* |
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* This is a version of ip_compute_csum() optimized for IP headers, |
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* which always checksum on 4 octet boundaries. |
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*/ |
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extern __sum16 ip_fast_csum(const void *iph, unsigned int ihl); |
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/* |
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* computes the checksum of the TCP/UDP pseudo-header |
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* returns a 16-bit checksum, already complemented |
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*/ |
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__sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, |
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__u32 len, __u8 proto, __wsum sum); |
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__wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, |
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__u32 len, __u8 proto, __wsum sum); |
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/* |
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* computes the checksum of a memory block at buff, length len, |
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* and adds in "sum" (32-bit) |
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* |
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* returns a 32-bit number suitable for feeding into itself |
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* or csum_tcpudp_magic |
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* |
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* this function must be called with even lengths, except |
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* for the last fragment, which may be odd |
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* |
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* it's best to have buff aligned on a 32-bit boundary |
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*/ |
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extern __wsum csum_partial(const void *buff, int len, __wsum sum); |
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/* |
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* the same as csum_partial, but copies from src while it |
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* checksums |
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* |
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* here even more important to align src and dst on a 32-bit (or even |
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* better 64-bit) boundary |
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*/ |
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER |
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#define _HAVE_ARCH_CSUM_AND_COPY |
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__wsum csum_and_copy_from_user(const void __user *src, void *dst, int len); |
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__wsum csum_partial_copy_nocheck(const void *src, void *dst, int len); |
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/* |
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* this routine is used for miscellaneous IP-like checksums, mainly |
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* in icmp.c |
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*/ |
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extern __sum16 ip_compute_csum(const void *buff, int len); |
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/* |
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* Fold a partial checksum without adding pseudo headers |
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*/ |
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static inline __sum16 csum_fold(__wsum csum) |
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{ |
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u32 sum = (__force u32)csum; |
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sum = (sum & 0xffff) + (sum >> 16); |
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sum = (sum & 0xffff) + (sum >> 16); |
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return (__force __sum16)~sum; |
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} |
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#define _HAVE_ARCH_IPV6_CSUM |
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extern __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
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const struct in6_addr *daddr, |
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__u32 len, __u8 proto, __wsum sum); |
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#endif
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