/*      $NetBSD: raw_usrreq.c,v 1.66 2024/07/05 04:31:53 rin Exp $      */

/*
 * Copyright (c) 1980, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)raw_usrreq.c        8.1 (Berkeley) 6/10/93
 */

/*
 * Raw protocol interface.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: raw_usrreq.c,v 1.66 2024/07/05 04:31:53 rin Exp $");

#include <sys/param.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kauth.h>

#include <net/if.h>
#include <net/route.h>
#include <net/raw_cb.h>

static inline int
equal(const struct sockaddr *a1, const struct sockaddr *a2)
{
        return memcmp(a1, a2, a1->sa_len) == 0;
}

/*
 * raw_input: find the socket associated with the packet and move it over.
 * If nothing exists for this packet, drop it.
 */
void
raw_input(struct mbuf *m0, struct sockproto *proto, struct sockaddr *src,
    struct sockaddr *dst, struct rawcbhead *rawcbhead)
{
        struct rawcb *rp;
        struct mbuf *m = m0;
        struct socket *last;

        last = NULL;
        LIST_FOREACH(rp, rawcbhead, rcb_list) {
                if (rp->rcb_proto.sp_family != proto->sp_family)
                        continue;
                if (rp->rcb_proto.sp_protocol  &&
                    rp->rcb_proto.sp_protocol != proto->sp_protocol)
                        continue;
                /*
                 * We assume the lower level routines have
                 * placed the address in a canonical format
                 * suitable for a structure comparison.
                 *
                 * Note that if the lengths are not the same
                 * the comparison will fail at the first byte.
                 */
                if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
                        continue;
                if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
                        continue;
                /* Run any filtering that may have been installed. */
                if (rp->rcb_filter != NULL && rp->rcb_filter(m, proto, rp) != 0)
                        continue;
                if (last != NULL) {
                        struct mbuf *n;

                        if ((n = m_copypacket(m, M_DONTWAIT)) == NULL ||
                            sbappendaddr(&last->so_rcv, src, n, NULL) == 0)
                        {
                                m_freem(n);
                                soroverflow(last);
                        } else
                                sorwakeup(last);
                }
                last = rp->rcb_socket;
        }
        if (last != NULL) {
                if (sbappendaddr(&last->so_rcv, src, m, NULL) == 0) {
                        m_freem(m);
                        soroverflow(last);
                } else
                        sorwakeup(last);
        } else {
                m_freem(m);
        }
}

void *
raw_ctlinput(int cmd, const struct sockaddr *arg, void *d)
{

        if ((unsigned)cmd >= PRC_NCMDS)
                return NULL;
        return NULL;
        /* INCOMPLETE */
}

void
raw_setsockaddr(struct rawcb *rp, struct sockaddr *nam)
{

        memcpy(nam, rp->rcb_laddr, rp->rcb_laddr->sa_len);
}

void
raw_setpeeraddr(struct rawcb *rp, struct sockaddr *nam)
{

        memcpy(nam, rp->rcb_faddr, rp->rcb_faddr->sa_len);
}

int
raw_send(struct socket *so, struct mbuf *m, struct sockaddr *nam,
    struct mbuf *control, struct lwp *l,
    int (*output)(struct mbuf *, struct socket *))
{
        struct rawcb *rp = sotorawcb(so);
        int error = 0;

        KASSERT(rp != NULL);

        /*
         * Ship a packet out.  The appropriate raw output
         * routine handles any massaging necessary.
         */
        if (control && control->m_len) {
                m_freem(control);
                m_freem(m);
                return EINVAL;
        }
        if (nam) {
                if ((so->so_state & SS_ISCONNECTED) != 0) {
                        error = EISCONN;
                        goto die;
                }
                error = (*so->so_proto->pr_usrreqs->pr_connect)(so, nam, l);
                if (error) {
                die:
                        m_freem(m);
                        return error;
                }
        } else {
                if ((so->so_state & SS_ISCONNECTED) == 0) {
                        error = ENOTCONN;
                        goto die;
                }
        }
        error = (*output)(m, so);
        if (nam)
                raw_disconnect(rp);

        return error;
}

int
raw_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam,
    struct mbuf *control, struct lwp *l)
{

        KASSERT(req != PRU_ATTACH);
        KASSERT(req != PRU_DETACH);
        KASSERT(req != PRU_ACCEPT);
        KASSERT(req != PRU_BIND);
        KASSERT(req != PRU_LISTEN);
        KASSERT(req != PRU_CONNECT);
        KASSERT(req != PRU_CONNECT2);
        KASSERT(req != PRU_DISCONNECT);
        KASSERT(req != PRU_SHUTDOWN);
        KASSERT(req != PRU_ABORT);
        KASSERT(req != PRU_CONTROL);
        KASSERT(req != PRU_SENSE);
        KASSERT(req != PRU_PEERADDR);
        KASSERT(req != PRU_SOCKADDR);
        KASSERT(req != PRU_RCVD);
        KASSERT(req != PRU_RCVOOB);
        KASSERT(req != PRU_SEND);
        KASSERT(req != PRU_SENDOOB);
        KASSERT(req != PRU_PURGEIF);

        if (sotorawcb(so) == NULL)
                return EINVAL;

        panic("raw_usrreq");

        return 0;
}