diff options
Diffstat (limited to 'csum.h')
| -rw-r--r-- | csum.h | 28 |
1 files changed, 28 insertions, 0 deletions
@@ -3,6 +3,7 @@ #include <netinet/in.h> #include <netinet/ip.h> +#include <netinet/ip6.h> #include "built_in.h" @@ -171,4 +172,31 @@ static inline uint16_t p4_csum(const struct ip *ip, const uint8_t *data, return __in_cksum(vec, 2); } +static inline uint16_t p6_csum(const struct ip6_hdr *ip6, const uint8_t *data, + uint32_t len, uint8_t next_proto) +{ + struct cksum_vec vec[2]; + struct pseudo_hdr { + uint8_t src[16]; + uint8_t dst[16]; + uint32_t len; + uint8_t mbz[3]; + uint8_t proto; + } __packed ph; + + memcpy(&ph.src, ip6->ip6_src.s6_addr, sizeof(ph.src)); + memcpy(&ph.dst, ip6->ip6_dst.s6_addr, sizeof(ph.dst)); + ph.len = htons(len); + memset(&ph.mbz, 0, sizeof(ph.mbz)); + ph.proto = next_proto; + + vec[0].ptr = (const uint8_t *) (void *) &ph; + vec[0].len = sizeof(ph); + + vec[1].ptr = data; + vec[1].len = len; + + return __in_cksum(vec, 2); +} + #endif /* CSUM_H */ |