bd4be308fc
At least two places in passt fill in UDP over IPv4 checksums, although since UDP checksums are optional with IPv4 that just amounts to storing a 0 (in tap_ip_send()) or leaving a 0 from an earlier initialization (in dhcp()). For consistency, add a helper for this "calculation". Just for the heck of it, add the option (compile time disabled for now) to calculate real UDP checksums. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
28 lines
962 B
C
28 lines
962 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_udp4(struct udphdr *udp4hr, in_addr_t saddr, in_addr_t daddr,
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const void *payload, size_t len);
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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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