6905ac75ec
Add a helper for calculating UDP checksums when used over IPv6 For future flexibility, the new helper takes parameters for the fields in the IPv6 pseudo-header, so an IPv6 header or pseudo-header doesn't need to be explicitly constructed. It also allows the UDP header and payload to be in separate buffers, although we don't use this yet. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
26 lines
848 B
C
26 lines
848 B
C
/* SPDX-License-Identifier: AGPL-3.0-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_icmp4(struct icmphdr *ih, 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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void csum_tcp4(struct iphdr *iph);
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uint16_t csum(const void *buf, size_t len, uint32_t init);
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#endif /* CHECKSUM_H */
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