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e289d287c6
Introduce the function csum_unfolded() that computes the unfolded 32-bit checksum of a data buffer, and call it from csum() that returns the folded value. Introduce csum_iov() that computes the checksum using csum_folded() on all vectors of the iovec array and returns the folded result. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Message-ID: <20240303135114.1023026-4-lvivier@redhat.com> [dwg: Fixed trivial cppcheck & clang-tidy regressions] Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef CHECKSUM_H
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#define CHECKSUM_H
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struct udphdr;
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struct icmphdr;
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struct icmp6hdr;
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uint32_t sum_16b(const void *buf, size_t len);
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uint16_t csum_fold(uint32_t sum);
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uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init);
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void csum_ip4_header(struct iphdr *ip4h);
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void csum_udp4(struct udphdr *udp4hr,
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struct in_addr saddr, struct in_addr daddr,
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const void *payload, size_t len);
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void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len);
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void csum_udp6(struct udphdr *udp6hr,
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const struct in6_addr *saddr, const struct in6_addr *daddr,
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const void *payload, size_t len);
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void csum_icmp6(struct icmp6hdr *icmp6hr,
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const struct in6_addr *saddr, const struct in6_addr *daddr,
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const void *payload, size_t len);
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uint32_t csum_unfolded(const void *buf, size_t len, uint32_t init);
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uint16_t csum(const void *buf, size_t len, uint32_t init);
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uint16_t csum_iov(const struct iovec *iov, size_t n, uint32_t init);
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#endif /* CHECKSUM_H */
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