diff options
Diffstat (limited to 'checksum.c')
| -rw-r--r-- | checksum.c | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -52,6 +52,8 @@ #include <stddef.h> #include <stdint.h> +#include <linux/icmpv6.h> + /** * sum_16b() - Calculate sum of 16-bit words * @buf: Input buffer @@ -106,6 +108,29 @@ uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init) } /** + * csum_icmp6() - Calculate and set checksum for an ICMPv6 packet + * @icmp6hr: ICMPv6 header, initialised apart from checksum + * @saddr: IPv6 source address + * @daddr: IPv6 destination address + * @payload: ICMP packet payload + * @len: Length of @payload (not including ICMPv6 header) + */ +void csum_icmp6(struct icmp6hdr *icmp6hr, + 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(*icmp6hr)) + htons(IPPROTO_ICMPV6); + + icmp6hr->icmp6_cksum = 0; + /* Add in partial checksum for the ICMPv6 header alone */ + psum += sum_16b(icmp6hr, sizeof(*icmp6hr)); + icmp6hr->icmp6_cksum = csum_unaligned(payload, len, psum); +} + +/** * csum_tcp4() - Calculate TCP checksum for IPv4 and set in place * @iph: Packet buffer, IP header */ |