From bd4be308fc92ed5d75ea45364a9f837d5c0fb0b2 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Wed, 19 Oct 2022 11:43:47 +1100 Subject: Add csum_udp4() helper for calculating UDP over IPv4 checksums 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 Signed-off-by: Stefano Brivio --- checksum.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'checksum.h') diff --git a/checksum.h b/checksum.h index 2bb2ff9..2a5e915 100644 --- a/checksum.h +++ b/checksum.h @@ -13,6 +13,8 @@ struct icmp6hdr; uint32_t sum_16b(const void *buf, size_t len); uint16_t csum_fold(uint32_t sum); uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init); +void csum_udp4(struct udphdr *udp4hr, in_addr_t saddr, in_addr_t daddr, + const void *payload, size_t len); void csum_icmp4(struct icmphdr *ih, const void *payload, size_t len); void csum_udp6(struct udphdr *udp6hr, const struct in6_addr *saddr, const struct in6_addr *daddr, -- cgit v1.2.3