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#ifndef _FRR_CHECKSUM_H
#define _FRR_CHECKSUM_H
#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 uint16_t in_cksumv(const struct iovec *iov, size_t iov_len);
static inline uint16_t in_cksum(const void *data, size_t nbytes)
{
struct iovec iov[1];
iov[0].iov_base = (void *)data;
iov[0].iov_len = nbytes;
return in_cksumv(iov, array_size(iov));
}
static inline uint16_t in_cksum_with_ph4(const struct ipv4_ph *ph,
const void *data, size_t nbytes)
{
struct iovec iov[2];
iov[0].iov_base = (void *)ph;
iov[0].iov_len = sizeof(*ph);
iov[1].iov_base = (void *)data;
iov[1].iov_len = nbytes;
return in_cksumv(iov, array_size(iov));
}
static inline uint16_t in_cksum_with_ph6(const struct ipv6_ph *ph,
const void *data, size_t nbytes)
{
struct iovec iov[2];
iov[0].iov_base = (void *)ph;
iov[0].iov_len = sizeof(*ph);
iov[1].iov_base = (void *)data;
iov[1].iov_len = nbytes;
return in_cksumv(iov, array_size(iov));
}
#define FLETCHER_CHECKSUM_VALIDATE 0xffff
extern uint16_t fletcher_checksum(uint8_t *, const size_t len,
const uint16_t offset);
#ifdef __cplusplus
}
#endif
#endif /* _FRR_CHECKSUM_H */
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