source: rtems/cpukit/libnetworking/net/raw_usrreq.c @ e791c230

/*
 * 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.
 * 4. 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
 * $FreeBSD: src/sys/net/raw_usrreq.c,v 1.44 2006/11/06 13:42:02 rwatson Exp $
 */

/*
 * $Id$
 */

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/systm.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 <net/if.h>
#include <net/route.h>
#include <net/netisr.h>
#include <net/raw_cb.h>

/*
 * Initialize raw connection block q.
 */
void
raw_init()
{

        rawcb.rcb_next = rawcb.rcb_prev = &rawcb;
}


/*
 * Raw protocol input routine.  Find the socket
 * associated with the packet(s) and move them over.  If
 * nothing exists for this packet, drop it.
 */
/*
 * Raw protocol interface.
 */
void
raw_input(m0, proto, src, dst)
        struct mbuf *m0;
        register struct sockproto *proto;
        struct sockaddr *src, *dst;
{
        register struct rawcb *rp;
        register struct mbuf *m = m0;
        register int sockets = 0;
        struct socket *last;

        last = 0;
        for (rp = rawcb.rcb_next; rp != &rawcb; rp = rp->rcb_next) {
                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.
                 */
#define equal(a1, a2) \
  (bcmp((caddr_t)(a1), (caddr_t)(a2), a1->sa_len) == 0)
                if (rp->rcb_laddr && !equal(rp->rcb_laddr, dst))
                        continue;
                if (rp->rcb_faddr && !equal(rp->rcb_faddr, src))
                        continue;
                if (last) {
                        struct mbuf *n;
                        n = m_copy(m, 0, (int)M_COPYALL);
                        if (n) {
                                if (sbappendaddr(&last->so_rcv, src,
                                    n, (struct mbuf *)0) == 0)
                                        /* should notify about lost packet */
                                        m_freem(n);
                                else {
                                        sorwakeup(last);
                                        sockets++;
                                }
                        }
                }
                last = rp->rcb_socket;
        }
        if (last) {
                if (sbappendaddr(&last->so_rcv, src,
                    m, (struct mbuf *)0) == 0)
                        m_freem(m);
                else {
                        sorwakeup(last);
                        sockets++;
                }
        } else
                m_freem(m);
}

/*ARGSUSED*/
void
raw_ctlinput(cmd, arg, dummy)
        int cmd;
        struct sockaddr *arg;
        void *dummy;
{

        if (cmd < 0 || cmd > PRC_NCMDS)
                return;
        /* INCOMPLETE */
}

/*ARGSUSED*/
int
raw_usrreq(so, req, m, nam, control)
        struct socket *so;
        int req;
        struct mbuf *m, *nam, *control;
{
        register struct rawcb *rp = sotorawcb(so);
        register int error = 0;
        int len;

        if (req == PRU_CONTROL)
                return (EOPNOTSUPP);
        if (control && control->m_len) {
                error = EOPNOTSUPP;
                goto release;
        }
        if (rp == 0) {
                error = EINVAL;
                goto release;
        }
        switch (req) {

        /*
         * Allocate a raw control block and fill in the
         * necessary info to allow packets to be routed to
         * the appropriate raw interface routine.
         */
        case PRU_ATTACH:
                if ((so->so_state & SS_PRIV) == 0) {
                        error = EACCES;
                        break;
                }
                error = raw_attach(so, (intptr_t)nam);
                break;

        /*
         * Destroy state just before socket deallocation.
         * Flush data or not depending on the options.
         */
        case PRU_DETACH:
                if (rp == 0) {
                        error = ENOTCONN;
                        break;
                }
                raw_detach(rp);
                break;

        /*
         * If a socket isn't bound to a single address,
         * the raw input routine will hand it anything
         * within that protocol family (assuming there's
         * nothing else around it should go to).
         */
        case PRU_CONNECT:
                error = EINVAL;
#if 0
                if (rp->rcb_faddr) {
                        error = EISCONN;
                        break;
                }
                nam = m_copym(nam, 0, M_COPYALL, M_WAIT);
                rp->rcb_faddr = mtod(nam, struct sockaddr *);
                soisconnected(so);
#endif
                break;

        case PRU_BIND:
                error = EINVAL;
#if 0
                if (rp->rcb_laddr) {
                        error = EINVAL;                 /* XXX */
                        break;
                }
                error = raw_bind(so, nam);
#endif
                break;

        case PRU_CONNECT2:
                error = EOPNOTSUPP;
                goto release;

        case PRU_DISCONNECT:
                if (rp->rcb_faddr == 0) {
                        error = ENOTCONN;
                        break;
                }
                raw_disconnect(rp);
                soisdisconnected(so);
                break;

        /*
         * Mark the connection as being incapable of further input.
         */
        case PRU_SHUTDOWN:
                socantsendmore(so);
                break;

        /*
         * Ship a packet out.  The appropriate raw output
         * routine handles any massaging necessary.
         */
        case PRU_SEND:
                if (nam) {
                        if (rp->rcb_faddr) {
                                error = EISCONN;
                                break;
                        }
                        rp->rcb_faddr = mtod(nam, struct sockaddr *);
                } else if (rp->rcb_faddr == 0) {
                        error = ENOTCONN;
                        break;
                }
                error = (*so->so_proto->pr_output)(m, so);
                m = NULL;
                if (nam)
                        rp->rcb_faddr = 0;
                break;

        case PRU_ABORT:
                raw_disconnect(rp);
                sofree(so);
                soisdisconnected(so);
                break;

        case PRU_SENSE:
                /*
                 * stat: don't bother with a blocksize.
                 */
                return (0);

        /*
         * Not supported.
         */
        case PRU_RCVOOB:
        case PRU_RCVD:
                return(EOPNOTSUPP);

        case PRU_LISTEN:
        case PRU_ACCEPT:
        case PRU_SENDOOB:
                error = EOPNOTSUPP;
                break;

        case PRU_SOCKADDR:
                if (rp->rcb_laddr == 0) {
                        error = EINVAL;
                        break;
                }
                len = rp->rcb_laddr->sa_len;
                bcopy((caddr_t)rp->rcb_laddr, mtod(nam, caddr_t), (unsigned)len);
                nam->m_len = len;
                break;

        case PRU_PEERADDR:
                if (rp->rcb_faddr == 0) {
                        error = ENOTCONN;
                        break;
                }
                len = rp->rcb_faddr->sa_len;
                bcopy((caddr_t)rp->rcb_faddr, mtod(nam, caddr_t), (unsigned)len);
                nam->m_len = len;
                break;

        default:
                panic("raw_usrreq");
        }
release:
        if (m != NULL)
                m_freem(m);
        return (error);
}