diff options
Diffstat (limited to 'checksum.c')
| -rw-r--r-- | checksum.c | 16 |
1 files changed, 16 insertions, 0 deletions
@@ -52,6 +52,7 @@ #include <stddef.h> #include <stdint.h> +#include <linux/icmp.h> #include <linux/icmpv6.h> /** @@ -108,6 +109,21 @@ uint16_t csum_unaligned(const void *buf, size_t len, uint32_t init) } /** + * csum_icmp4() - Calculate and set checksum for an ICMP packet + * @icmp4hr: ICMP header, initialised apart from checksum + * @payload: ICMP packet payload + * @len: Length of @payload (not including ICMP header) + */ +void csum_icmp4(struct icmphdr *icmp4hr, const void *payload, size_t len) +{ + /* Partial checksum for ICMP header alone */ + uint32_t psum = sum_16b(icmp4hr, sizeof(*icmp4hr)); + + icmp4hr->checksum = 0; + icmp4hr->checksum = 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 |