/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _LINUX_NEXTHOP_H

#define _LINUX_NEXTHOP_H

#include <linux/types.h>

struct nhmsg {

	unsigned char	nh_family;

	unsigned char	nh_scope;     /* return only */

	unsigned char	nh_protocol;  /* Routing protocol that installed nh */

	unsigned char	resvd;

	unsigned int	nh_flags;     /* RTNH_F flags */

};

/* entry in a nexthop group */

struct nexthop_grp {

	__u32	id;	  /* nexthop id - must exist */

	__u8	weight;   /* weight of this nexthop */

	__u8	resvd1;

	__u16	resvd2;

};

enum {

	NEXTHOP_GRP_TYPE_MPATH,  /* default type if not specified */

	__NEXTHOP_GRP_TYPE_MAX,

};

#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)

enum {

	NHA_UNSPEC,

	NHA_ID,		/* u32; id for nexthop. id == 0 means auto-assign */

	NHA_GROUP,	/* array of nexthop_grp */

	NHA_GROUP_TYPE,	/* u16 one of NEXTHOP_GRP_TYPE */

	/* if NHA_GROUP attribute is added, no other attributes can be set */

	NHA_BLACKHOLE,	/* flag; nexthop used to blackhole packets */

	/* if NHA_BLACKHOLE is added, OIF, GATEWAY, ENCAP can not be set */

	NHA_OIF,	/* u32; nexthop device */

	NHA_GATEWAY,	/* be32 (IPv4) or in6_addr (IPv6) gw address */

	NHA_ENCAP_TYPE, /* u16; lwt encap type */

	NHA_ENCAP,	/* lwt encap data */

	/* NHA_OIF can be appended to dump request to return only

	 * nexthops using given device

	 */

	NHA_GROUPS,	/* flag; only return nexthop groups in dump */

	NHA_MASTER,	/* u32;  only return nexthops with given master dev */

	NHA_FDB,	/* flag; nexthop belongs to a bridge fdb */

	/* if NHA_FDB is added, OIF, BLACKHOLE, ENCAP cannot be set */

	__NHA_MAX,

};

#define NHA_MAX	(__NHA_MAX - 1)

#endif