sys/netproto/ns/ns_output.c

   1 /*
   2  * Copyright (c) 1984, 1985, 1986, 1987, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)ns_output.c 8.1 (Berkeley) 6/10/93
  34  * $FreeBSD: src/sys/netns/ns_output.c,v 1.7 1999/08/28 00:49:51 peter Exp $
  35  * $DragonFly: src/sys/netproto/ns/ns_output.c,v 1.8 2006/01/14 13:36:40 swildner Exp $
  36  */
  37
  38 #include <sys/param.h>
  39 #include <sys/malloc.h>
  40 #include <sys/mbuf.h>
  41 #include <sys/errno.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44
  45 #include <net/if.h>
  46 #include <net/route.h>
  47
  48 #include "ns.h"
  49 #include "ns_if.h"
  50 #include "idp.h"
  51 #include "idp_var.h"
  52
  53 int ns_hold_output = 0;
  54 int ns_copy_output = 0;
  55 int ns_output_cnt = 0;
  56 struct mbuf *ns_lastout;
  57
  58 int
  59 ns_output(struct mbuf *m0, struct route *ro, int flags)
  60 {
  61         struct idp *idp = mtod(m0, struct idp *);
  62         struct ifnet *ifp = 0;
  63         int error = 0;
  64         struct route idproute;
  65         struct sockaddr_ns *dst;
  66
  67         if (ns_hold_output) {
  68                 if (ns_lastout) {
  69                         m_free(ns_lastout);
  70                 }
  71                 ns_lastout = m_copy(m0, 0, (int)M_COPYALL);
  72         }
  73         /*
  74          * Route packet.
  75          */
  76         if (ro == 0) {
  77                 ro = &idproute;
  78                 bzero((caddr_t)ro, sizeof (*ro));
  79         }
  80         dst = (struct sockaddr_ns *)&ro->ro_dst;
  81         if (ro->ro_rt == 0) {
  82                 dst->sns_family = AF_NS;
  83                 dst->sns_len = sizeof (*dst);
  84                 dst->sns_addr = idp->idp_dna;
  85                 dst->sns_addr.x_port = 0;
  86                 /*
  87                  * If routing to interface only,
  88                  * short circuit routing lookup.
  89                  */
  90                 if (flags & NS_ROUTETOIF) {
  91                         struct ns_ifaddr *ia = ns_iaonnetof(&idp->idp_dna);
  92
  93                         if (ia == 0) {
  94                                 error = ENETUNREACH;
  95                                 goto bad;
  96                         }
  97                         ifp = ia->ia_ifp;
  98                         goto gotif;
  99                 }
 100                 rtalloc(ro);
 101         } else if ((ro->ro_rt->rt_flags & RTF_UP) == 0) {
 102                 /*
 103                  * The old route has gone away; try for a new one.
 104                  */
 105                 rtfree(ro->ro_rt);
 106                 ro->ro_rt = NULL;
 107                 rtalloc(ro);
 108         }
 109         if (ro->ro_rt == 0 || (ifp = ro->ro_rt->rt_ifp) == 0) {
 110                 error = ENETUNREACH;
 111                 goto bad;
 112         }
 113         ro->ro_rt->rt_use++;
 114         if (ro->ro_rt->rt_flags & (RTF_GATEWAY|RTF_HOST))
 115                 dst = (struct sockaddr_ns *)ro->ro_rt->rt_gateway;
 116 gotif:
 117
 118         /*
 119          * Look for multicast addresses and
 120          * and verify user is allowed to send
 121          * such a packet.
 122          */
 123         if (dst->sns_addr.x_host.c_host[0]&1) {
 124                 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
 125                         error = EADDRNOTAVAIL;
 126                         goto bad;
 127                 }
 128                 if ((flags & NS_ALLOWBROADCAST) == 0) {
 129                         error = EACCES;
 130                         goto bad;
 131                 }
 132         }
 133
 134         if (htons(idp->idp_len) <= ifp->if_mtu) {
 135                 ns_output_cnt++;
 136                 if (ns_copy_output) {
 137                         ns_watch_output(m0, ifp);
 138                 }
 139                 lwkt_serialize_enter(ifp->if_serializer);
 140                 error = (*ifp->if_output)(ifp, m0,
 141                                         (struct sockaddr *)dst, ro->ro_rt);
 142                 lwkt_serialize_exit(ifp->if_serializer);
 143                 goto done;
 144         } else error = EMSGSIZE;
 145
 146
 147 bad:
 148         if (ns_copy_output) {
 149                 ns_watch_output(m0, ifp);
 150         }
 151         m_freem(m0);
 152 done:
 153         if (ro == &idproute && (flags & NS_ROUTETOIF) == 0 && ro->ro_rt) {
 154                 RTFREE(ro->ro_rt);
 155                 ro->ro_rt = 0;
 156         }
 157         return (error);
 158 }