/*	$OpenBSD: ip_mroute.h,v 1.34 2025/05/09 14:43:47 jan Exp $	*/
/*	$NetBSD: ip_mroute.h,v 1.23 2004/04/21 17:49:46 itojun Exp $	*/

#ifndef _NETINET_IP_MROUTE_H_
#define _NETINET_IP_MROUTE_H_

/*
 * Definitions for IP multicast forwarding.
 *
 * Written by David Waitzman, BBN Labs, August 1988.
 * Modified by Steve Deering, Stanford, February 1989.
 * Modified by Ajit Thyagarajan, PARC, August 1993.
 * Modified by Ajit Thyagarajan, PARC, August 1994.
 * Modified by Ahmed Helmy, SGI, June 1996.
 * Modified by Pavlin Radoslavov, ICSI, October 2002.
 *
 * MROUTING Revision: 1.2
 * advanced API support, bandwidth metering and signaling.
 */

/*
 * Multicast Routing set/getsockopt commands.
 */
#define	MRT_INIT		100	/* initialize forwarder */
#define	MRT_DONE		101	/* shut down forwarder */
#define	MRT_ADD_VIF		102	/* create virtual interface */
#define	MRT_DEL_VIF		103	/* delete virtual interface */
#define	MRT_ADD_MFC		104	/* insert forwarding cache entry */
#define	MRT_DEL_MFC		105	/* delete forwarding cache entry */
#define	MRT_VERSION		106	/* get kernel version number */
#define	MRT_ASSERT		107	/* enable assert processing */
#define	MRT_API_SUPPORT		109	/* supported MRT API */
#define	MRT_API_CONFIG		110	/* config MRT API */

/*
 * Types and macros for handling bitmaps with one bit per virtual interface.
 */
#define	MAXVIFS 32
typedef u_int32_t vifbitmap_t;
typedef u_int16_t vifi_t;		/* type of a vif index */

#define	VIFM_SET(n, m)			((m) |= (1 << (n)))
#define	VIFM_CLR(n, m)			((m) &= ~(1 << (n)))
#define	VIFM_ISSET(n, m)		((m) & (1 << (n)))
#define	VIFM_CLRALL(m)			((m) = 0x00000000)
#define	VIFM_COPY(mfrom, mto)		((mto) = (mfrom))
#define	VIFM_SAME(m1, m2)		((m1) == (m2))

#define	VIFF_TUNNEL	0x1		/* vif represents a tunnel end-point */
#define	VIFF_SRCRT	0x2		/* tunnel uses IP src routing */

/*
 * Argument structure for MRT_ADD_VIF.
 * (MRT_DEL_VIF takes a single vifi_t argument.)
 */
struct vifctl {
	vifi_t	  vifc_vifi;		/* the index of the vif to be added */
	u_int8_t  vifc_flags;		/* VIFF_ flags defined above */
	u_int8_t  vifc_threshold;	/* min ttl required to forward on vif */
	u_int32_t vifc_rate_limit;	/* ignored */
	struct	  in_addr vifc_lcl_addr;/* local interface address */
	struct	  in_addr vifc_rmt_addr;/* remote address (tunnels only) */
};

/*
 * Argument structure for MRT_ADD_MFC and MRT_DEL_MFC.
 * XXX if you change this, make sure to change struct mfcctl2 as well.
 */
struct mfcctl {
	struct	 in_addr mfcc_origin;	/* ip origin of mcasts */
	struct	 in_addr mfcc_mcastgrp;	/* multicast group associated */
	vifi_t	 mfcc_parent;		/* incoming vif */
	u_int8_t mfcc_ttls[MAXVIFS];	/* forwarding ttls on vifs */
};

/*
 * The new argument structure for MRT_ADD_MFC and MRT_DEL_MFC overlays
 * and extends the old struct mfcctl.
 */
struct mfcctl2 {
	/* the mfcctl fields */
	struct in_addr	mfcc_origin;		/* ip origin of mcasts	     */
	struct in_addr	mfcc_mcastgrp;		/* multicast group associated*/
	vifi_t		mfcc_parent;		/* incoming vif		     */
	u_int8_t	mfcc_ttls[MAXVIFS];	/* forwarding ttls on vifs   */

	/* extension fields */
	u_int8_t	mfcc_flags[MAXVIFS];	/* the MRT_MFC_FLAGS_* flags */
	struct in_addr	mfcc_rp;		/* the RP address            */
};
/*
 * The advanced-API flags.
 *
 * The MRT_MFC_FLAGS_XXX API flags are also used as flags
 * for the mfcc_flags field.
 */
#define	MRT_MFC_FLAGS_DISABLE_WRONGVIF	(1 << 0) /* disable WRONGVIF signals */
#define	MRT_MFC_RP			(1 << 8) /* enable RP address	     */
#define	MRT_MFC_BW_UPCALL		(1 << 9) /* enable bw upcalls	     */
#define	MRT_MFC_FLAGS_ALL		(MRT_MFC_FLAGS_DISABLE_WRONGVIF)
#define	MRT_API_FLAGS_ALL		(MRT_MFC_FLAGS_ALL |		     \
					 MRT_MFC_RP |			     \
					 MRT_MFC_BW_UPCALL)

/* structure used to get all the mfc entries */
struct mfcinfo {
	struct	 in_addr mfc_origin;	/* ip origin of mcasts */
	struct	 in_addr mfc_mcastgrp;	/* multicast group associated */
	vifi_t	 mfc_parent;		/* incoming vif */
	u_long	 mfc_pkt_cnt;		/* pkt count for src-grp */
	u_long	 mfc_byte_cnt;		/* byte count for src-grp */
	u_int8_t mfc_ttls[MAXVIFS];	/* forwarding ttls on vifs */
};

/* structure used to get all the vif entries */
struct vifinfo {
	vifi_t	  v_vifi;		/* the index of the vif to be added */
	u_int8_t  v_flags;		/* VIFF_ flags defined above */
	u_int8_t  v_threshold;		/* min ttl required to forward on vif */
	struct	  in_addr v_lcl_addr;	/* local interface address */
	struct	  in_addr v_rmt_addr;	/* remote address (tunnels only) */
	u_long	  v_pkt_in;		/* # pkts in on interface */
	u_long	  v_pkt_out;		/* # pkts out on interface */
	u_long	  v_bytes_in;		/* # bytes in on interface */
	u_long	  v_bytes_out;		/* # bytes out on interface */
};

/*
 * Argument structure used by mrouted to get src-grp pkt counts.
 */
struct sioc_sg_req {
	struct	in_addr src;
	struct	in_addr grp;
	u_long	pktcnt;
	u_long	bytecnt;
	u_long	wrong_if;
};

/*
 * Argument structure used by mrouted to get vif pkt counts.
 */
struct sioc_vif_req {
	vifi_t	vifi;			/* vif number */
	u_long	icount;			/* input packet count on vif */
	u_long	ocount;			/* output packet count on vif */
	u_long	ibytes;			/* input byte count on vif */
	u_long	obytes;			/* output byte count on vif */
};


/*
 * The kernel's multicast routing statistics.
 */
struct mrtstat {
	u_long	mrts_mfc_lookups;	/* # forw. cache hash table hits */
	u_long	mrts_mfc_misses;	/* # forw. cache hash table misses */
	u_long	mrts_upcalls;		/* # calls to mrouted */
	u_long	mrts_no_route;		/* no route for packet's origin */
	u_long	mrts_bad_tunnel;	/* malformed tunnel options */
	u_long	mrts_cant_tunnel;	/* no room for tunnel options */
	u_long	mrts_wrong_if;		/* arrived on wrong interface */
	u_long	mrts_upq_ovflw;		/* upcall Q overflow */
	u_long	mrts_cache_cleanups;	/* # entries with no upcalls */
	u_long	mrts_drop_sel;		/* pkts dropped selectively */
	u_long	mrts_q_overflow;	/* pkts dropped - Q overflow */
	u_long	mrts_pkt2large;		/* pkts dropped - size > BKT SIZE */
	u_long	mrts_upq_sockfull;	/* upcalls dropped - socket full */
};

#ifdef _KERNEL

enum mrtstat_counters {
	mrts_mfc_lookups,
	mrts_mfc_misses,
	mrts_upcalls,
	mrts_no_route,
	mrts_bad_tunnel,
	mrts_cant_tunnel,
	mrts_wrong_if,
	mrts_upq_ovflw,
	mrts_cache_cleanups,
	mrts_drop_sel,
	mrts_q_overflow,
	mrts_pkt2large,
	mrts_upq_sockfull,
	mrts_ncounters
};

extern struct cpumem *mrtcounters;

static inline void
mrtstat_inc(enum mrtstat_counters c)
{
	counters_inc(mrtcounters, c);
}

/* How frequent should we look for expired entries (in seconds). */
#define MCAST_EXPIRE_FREQUENCY		30

extern int ip_mrtproto;

/*
 * The kernel's virtual-interface structure.
 */
struct vif {
	vifi_t    v_id;			/* Virtual interface index */
	u_int8_t  v_flags;		/* VIFF_ flags defined above */
	u_int8_t  v_threshold;		/* min ttl required to forward on vif */
	struct	  in_addr v_lcl_addr;	/* local interface address */
	struct	  in_addr v_rmt_addr;	/* remote address (tunnels only) */
	u_long	  v_pkt_in;		/* # pkts in on interface */
	u_long	  v_pkt_out;		/* # pkts out on interface */
	u_long	  v_bytes_in;		/* # bytes in on interface */
	u_long	  v_bytes_out;		/* # bytes out on interface */
};

/*
 * The kernel's multicast forwarding cache entry structure.
 * (A field for the type of service (mfc_tos) is to be added
 * at a future point.)
 */
struct mfc {
	vifi_t	 mfc_parent;			/* incoming vif */
	u_long	 mfc_pkt_cnt;			/* pkt count for src-grp */
	u_long	 mfc_byte_cnt;			/* byte count for src-grp */
	u_long	 mfc_wrong_if;			/* wrong if for src-grp	*/
	uint8_t	 mfc_ttl;			/* route interface ttl */
	uint8_t  mfc_flags;			/* MRT_MFC_FLAGS_* flags */
	struct in_addr	mfc_rp;			/* the RP address	     */
	u_long	 mfc_expire;			/* expire timer */
};

/*
 * Structure used to communicate from kernel to multicast router.
 * (Note the convenient similarity to an IP packet.)
 */
struct igmpmsg {
	u_int32_t unused1;
	u_int32_t unused2;
	u_int8_t  im_msgtype;		/* what type of message */
#define	IGMPMSG_NOCACHE		1	/* no MFC in the kernel		    */
#define	IGMPMSG_WRONGVIF	2	/* packet came from wrong interface */
#define	IGMPMSG_BW_UPCALL	4	/* BW monitoring upcall		    */
	u_int8_t  im_mbz;		/* must be zero */
	u_int8_t  im_vif;		/* vif rec'd on */
	u_int8_t  unused3;
	struct	  in_addr im_src, im_dst;
};

int	ip_mrouter_set(struct socket *, int, struct mbuf *);
int	ip_mrouter_get(struct socket *, int, struct mbuf *);
void	mrt_init(void);
int	mrt_ioctl(struct socket *, u_long, caddr_t);
int	mrt_sysctl_vif(void *, size_t *);
int	mrt_sysctl_mrtstat(void *, size_t *, void *);
int	mrt_sysctl_mfc(void *, size_t *);
int	ip_mrouter_done(struct socket *);
void	vif_delete(struct ifnet *);

#endif /* _KERNEL */
#endif /* _NETINET_IP_MROUTE_H_ */