diff options
Diffstat (limited to 'checksum.c')
| -rw-r--r-- | checksum.c | 22 |
1 files changed, 22 insertions, 0 deletions
@@ -52,6 +52,7 @@ #include <stddef.h> #include <stdint.h> +#include <linux/udp.h> #include <linux/icmp.h> #include <linux/icmpv6.h> @@ -124,6 +125,27 @@ void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len) } /** + * csum_udp6() - Calculate and set checksum for a UDP over IPv6 packet + * @udp6hr: UDP header, initialised apart from checksum + * @payload: UDP packet payload + * @len: Length of @payload (not including UDP header) + */ +void csum_udp6(struct udphdr *udp6hr, + const struct in6_addr *saddr, const struct in6_addr *daddr, + const void *payload, size_t len) +{ + /* Partial checksum for the pseudo-IPv6 header */ + uint32_t psum = sum_16b(saddr, sizeof(*saddr)) + + sum_16b(daddr, sizeof(*daddr)) + + htons(len + sizeof(*udp6hr)) + htons(IPPROTO_UDP); + + udp6hr->check = 0; + /* Add in partial checksum for the UDP header alone */ + psum += sum_16b(udp6hr, sizeof(*udp6hr)); + udp6hr->check = csum_unaligned(payload, len, psum); +} + +/** * csum_icmp6() - Calculate and set checksum for an ICMPv6 packet * @icmp6hr: ICMPv6 header, initialised apart from checksum * @saddr: IPv6 source address |