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The TCP and UDP checksums are computed using the data in the TCP/UDP payload but also some informations in the IP header (protocol, length, source and destination addresses). We add two functions, proto_ipv4_header_psum() and proto_ipv6_header_psum(), to compute the checksum of the IP header part. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Message-ID: <20240303135114.1023026-8-lvivier@redhat.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
38 lines
1.4 KiB
C
38 lines
1.4 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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uint16_t csum_ip4_header(uint16_t tot_len, uint8_t protocol,
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struct in_addr saddr, struct in_addr daddr);
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uint32_t proto_ipv4_header_psum(uint16_t tot_len, uint8_t protocol,
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struct in_addr saddr, struct in_addr daddr);
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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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uint32_t proto_ipv6_header_psum(uint16_t payload_len, uint8_t protocol,
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const struct in6_addr *saddr,
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const struct in6_addr *daddr);
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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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