[mirror_frr.git] / lib / checksum.h

#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 */
Commit	Line	Data
264c806d DL	1	#ifndef _FRR_CHECKSUM_H
	2	#define _FRR_CHECKSUM_H
	3
17b48d7d QY	4	#include <stdint.h>
	5	#include <netinet/in.h>
	6
5e244469 RW	7	#ifdef __cplusplus
	8	extern "C" {
	9	#endif
	10
17b48d7d QY	11
	12	/* IPv4 pseudoheader */
	13	struct ipv4_ph {
	14	struct in_addr src;
	15	struct in_addr dst;
	16	uint8_t rsvd;
	17	uint8_t proto;
	18	uint16_t len;
	19	} __attribute__((packed));
	20
	21	/* IPv6 pseudoheader */
	22	struct ipv6_ph {
	23	struct in6_addr src;
	24	struct in6_addr dst;
	25	uint32_t ulpl;
	26	uint8_t zero[3];
	27	uint8_t next_hdr;
	28	} __attribute__((packed));
	29
89087f23 DL	30
	31	extern uint16_t in_cksumv(const struct iovec *iov, size_t iov_len);
	32
	33	static inline uint16_t in_cksum(const void *data, size_t nbytes)
	34	{
	35	struct iovec iov[1];
	36
	37	iov[0].iov_base = (void *)data;
	38	iov[0].iov_len = nbytes;
	39	return in_cksumv(iov, array_size(iov));
	40	}
	41
	42	static inline uint16_t in_cksum_with_ph4(const struct ipv4_ph *ph,
	43	const void *data, size_t nbytes)
	44	{
	45	struct iovec iov[2];
	46
	47	iov[0].iov_base = (void *)ph;
	48	iov[0].iov_len = sizeof(*ph);
	49	iov[1].iov_base = (void *)data;
	50	iov[1].iov_len = nbytes;
	51	return in_cksumv(iov, array_size(iov));
	52	}
	53
	54	static inline uint16_t in_cksum_with_ph6(const struct ipv6_ph *ph,
	55	const void *data, size_t nbytes)
	56	{
	57	struct iovec iov[2];
	58
	59	iov[0].iov_base = (void *)ph;
	60	iov[0].iov_len = sizeof(*ph);
	61	iov[1].iov_base = (void *)data;
	62	iov[1].iov_len = nbytes;
	63	return in_cksumv(iov, array_size(iov));
	64	}
17b48d7d	65
d8a4e42b	66	#define FLETCHER_CHECKSUM_VALIDATE 0xffff
d7c0a89a QY	67	extern uint16_t fletcher_checksum(uint8_t *, const size_t len,
d7c0a89a QY	68	const uint16_t offset);
5e244469 RW	69
	70	#ifdef __cplusplus
	71	}
	72	#endif
264c806d DL	73
264c806d DL	74	#endif /* _FRR_CHECKSUM_H */