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 <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/checksum.h b/checksum.h
index bf0620f..2bb2ff9 100644
--- a/checksum.h
+++ b/checksum.h
@@ -6,6 +6,7 @@
 #ifndef CHECKSUM_H
 #define CHECKSUM_H
 
+struct udphdr;
 struct icmphdr;
 struct icmp6hdr;
 
@@ -13,6 +14,9 @@ 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_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,
+	       const void *payload, size_t len);
 void csum_icmp6(struct icmp6hdr *icmp6hr,
 		const struct in6_addr *saddr, const struct in6_addr *daddr,
 		const void *payload, size_t len);