FreeBSD/Linux Kernel Cross Reference
sys/netns/ns_output.c

     /*
      * Copyright (c) 1984, 1985, 1986, 1987, 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. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 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.
     *
     *      @(#)ns_output.c 8.1 (Berkeley) 6/10/93
     * $FreeBSD: releng/5.0/sys/netns/ns_output.c 85972 2001-11-03 13:35:07Z peter $
     */
    
    #include <sys/param.h>
    #include <sys/malloc.h>
    #include <sys/mbuf.h>
    #include <sys/errno.h>
    #include <sys/socket.h>
    #include <sys/socketvar.h>
    
    #include <net/if.h>
    #include <net/route.h>
    
    #include <netns/ns.h>
    #include <netns/ns_if.h>
    #include <netns/idp.h>
    #include <netns/idp_var.h>
    
    int ns_hold_output = 0;
    int ns_copy_output = 0;
    int ns_output_cnt = 0;
    struct mbuf *ns_lastout;
    
    ns_output(m0, ro, flags)
            struct mbuf *m0;
            struct route *ro;
            int flags;
    {
            register struct idp *idp = mtod(m0, struct idp *);
            register struct ifnet *ifp = 0;
            int error = 0;
            struct route idproute;
            struct sockaddr_ns *dst;
            extern int idpcksum;
    
            if (ns_hold_output) {
                    if (ns_lastout) {
                            (void)m_free(ns_lastout);
                    }
                    ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
            }
            /*
             * Route packet.
             */
            if (ro == 0) {
                    ro = &idproute;
                    bzero((caddr_t)ro, sizeof (*ro));
            }
            dst = (struct sockaddr_ns *)&ro->ro_dst;
            if (ro->ro_rt == 0) {
                    dst->sns_family = AF_NS;
                    dst->sns_len = sizeof (*dst);
                    dst->sns_addr = idp->idp_dna;
                    dst->sns_addr.x_port = 0;
                    /*
                     * If routing to interface only,
                     * short circuit routing lookup.
                     */
                    if (flags & NS_ROUTETOIF) {
                            struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
    
                            if (ia == 0) {
                                    error = ENETUNREACH;
                                    goto bad;
                            }
                            ifp = ia->ia_ifp;
                           goto gotif;
                   }
                   rtalloc(ro);
           } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
                   /*
                    * The old route has gone away; try for a new one.
                    */
                   rtfree(ro->ro_rt);
                   ro->ro_rt = NULL;
                   rtalloc(ro);
           }
           if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
                   error = ENETUNREACH;
                   goto bad;
           }
           ro->ro_rt->rt_use++;
           if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
                   dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
   gotif:
   
           /*
            * Look for multicast addresses and
            * and verify user is allowed to send
            * such a packet.
            */
           if (dst->sns_addr.x_host.c_host[0]&1) {
                   if ((ifp->if_flags & IFF_BROADCAST) == 0) {
                           error = EADDRNOTAVAIL;
                           goto bad;
                   }
                   if ((flags & NS_ALLOWBROADCAST) == 0) {
                           error = EACCES;
                           goto bad;
                   }
           }
   
           if (htons(idp->idp_len) <= ifp->if_mtu) {
                   ns_output_cnt++;
                   if (ns_copy_output) {
                           ns_watch_output(m0, ifp);
                   }
                   error = (*ifp->if_output)(ifp, m0,
                                           (struct sockaddr *)dst, ro->ro_rt);
                   goto done;
           } else error = EMSGSIZE;
   
   
   bad:
           if (ns_copy_output) {
                   ns_watch_output(m0, ifp);
           }
           m_freem(m0);
   done:
           if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
                   RTFREE(ro->ro_rt);
                   ro->ro_rt = 0;
           }
           return (error);
   }

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