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#include <stdint.h>
#include <netinet/in.h>
#ifdef __cplusplus
extern "C" {
#endif
/* IPv4 pseudoheader */
struct ipv4_ph {
struct in_addr src;
struct in_addr dst;
uint8_t rsvd;
uint8_t proto;
uint16_t len;
} __attribute__((packed));
/* IPv6 pseudoheader */
struct ipv6_ph {
struct in6_addr src;
struct in6_addr dst;
uint32_t ulpl;
uint8_t zero[3];
uint8_t next_hdr;
} __attribute__((packed));
extern int in_cksum(void *data, int nbytes);
extern int in_cksum_with_ph4(struct ipv4_ph *ph, void *data, int nbytes);
extern int in_cksum_with_ph6(struct ipv6_ph *ph, void *data, int nbytes);
#define FLETCHER_CHECKSUM_VALIDATE 0xffff
extern uint16_t fletcher_checksum(uint8_t *, const size_t len,
const uint16_t offset);
#ifdef __cplusplus
}
#endif
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