/*      $OpenBSD: ip_divert.h,v 1.30 2025/06/23 12:05:46 bluhm Exp $ */

/*
 * Copyright (c) 2009 Michele Marchetto <michele@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#ifndef _IP_DIVERT_H_
#define _IP_DIVERT_H_

struct divstat {
        u_long  divs_ipackets;  /* total input packets */
        u_long  divs_noport;    /* no socket on port */
        u_long  divs_fullsock;  /* not delivered, input socket full */
        u_long  divs_opackets;  /* total output packets */
        u_long  divs_errors;    /* generic errors */
};

/*
 * Names for divert sysctl objects
 */
#define DIVERTCTL_RECVSPACE     1       /* receive buffer space */
#define DIVERTCTL_SENDSPACE     2       /* send buffer space */
#define DIVERTCTL_STATS         3       /* divert statistics */
#define DIVERTCTL_MAXID         4

#define DIVERTCTL_NAMES { \
        { 0, 0 }, \
        { "recvspace",  CTLTYPE_INT }, \
        { "sendspace",  CTLTYPE_INT }, \
        { "stats",      CTLTYPE_STRUCT } \
}

#ifdef _KERNEL

#include <sys/percpu.h>

#define DIVERT_SENDSPACE        (65536 + 100)
#define DIVERT_RECVSPACE        (65536 + 100)
#define DIVERT_HASHSIZE         128

enum divstat_counters {
        divs_ipackets,
        divs_noport,
        divs_fullsock,
        divs_opackets,
        divs_errors,
        divs_ncounters,
};

extern struct cpumem *divcounters;

static inline void
divstat_inc(enum divstat_counters c)
{
        counters_inc(divcounters, c);
}

extern u_int divert_sendspace;
extern u_int divert_recvspace;
extern struct inpcbtable divbtable, divb6table;
extern const struct pr_usrreqs divert_usrreqs, divert6_usrreqs;

void     divert_init(void);
void     divert_packet(struct mbuf *, int, u_int16_t);
int      divert_sysctl(int *, u_int, void *, size_t *, void *, size_t);
int      divert_sysctl_divstat(void *, size_t *, void *);
int      divert_attach(struct socket *, int, int);
int      divert_detach(struct socket *);
int      divert_bind(struct socket *, struct mbuf *, struct proc *);
int      divert_shutdown(struct socket *);
int      divert_send(struct socket *, struct mbuf *, struct mbuf *,
             struct mbuf *);

void     divert6_init(void);
void     divert6_packet(struct mbuf *, int, u_int16_t);
int      divert6_attach(struct socket *, int, int);
int      divert6_send(struct socket *, struct mbuf *, struct mbuf *,
             struct mbuf *);

#endif /* _KERNEL */
#endif /* _IP_DIVERT_H_ */