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65 lines
1.6 KiB
65 lines
1.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef __ASM_GENERIC_CHECKSUM_H |
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#define __ASM_GENERIC_CHECKSUM_H |
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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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#ifndef ip_fast_csum |
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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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#endif |
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#ifndef csum_fold |
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/* |
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* Fold a partial checksum |
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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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#endif |
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#ifndef csum_tcpudp_nofold |
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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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extern __wsum |
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, |
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__u8 proto, __wsum sum); |
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#endif |
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#ifndef csum_tcpudp_magic |
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static inline __sum16 |
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csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, |
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__u8 proto, __wsum sum) |
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{ |
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum)); |
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} |
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#endif |
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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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#endif /* __ASM_GENERIC_CHECKSUM_H */
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