From 6905ac75ec6643fbc93963ad9ded4903e8eeebf0 Mon Sep 17 00:00:00 2001 From: David Gibson Date: Wed, 19 Oct 2022 11:43:46 +1100 Subject: Add csum_udp6() helper for calculating UDP over IPv6 checksums 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 Signed-off-by: Stefano Brivio --- tap.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'tap.c') diff --git a/tap.c b/tap.c index f082901..9c197cb 100644 --- a/tap.c +++ b/tap.c @@ -183,9 +183,8 @@ void tap_ip_send(const struct ctx *c, const struct in6_addr *src, uint8_t proto, } else if (proto == IPPROTO_UDP) { struct udphdr *uh = (struct udphdr *)(ip6h + 1); - uh->check = 0; - uh->check = csum_unaligned(ip6h, len + sizeof(*ip6h), - 0); + csum_udp6(uh, &ip6h->saddr, &ip6h->daddr, + uh + 1, len - sizeof(*uh)); } else if (proto == IPPROTO_ICMPV6) { struct icmp6hdr *ih = (struct icmp6hdr *)(ip6h + 1); -- cgit v1.2.3