/*      $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;
}

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