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if_loop.c revision 1.1 
      1 /*
      2  * Copyright (c) 1982, 1986 Regents of the University of California.
      3  * 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  *	@(#)if_loop.c	7.13 (Berkeley) 4/26/91
     34  */
     35 
     36 /*
     37  * Loopback interface driver for protocol testing and timing.
     38  */
     39 
     40 #include "param.h"
     41 #include "systm.h"
     42 #include "mbuf.h"
     43 #include "socket.h"
     44 #include "errno.h"
     45 #include "ioctl.h"
     46 
     47 #include "../net/if.h"
     48 #include "../net/if_types.h"
     49 #include "../net/netisr.h"
     50 #include "../net/route.h"
     51 
     52 #include "machine/mtpr.h"
     53 
     54 #ifdef	INET
     55 #include "../netinet/in.h"
     56 #include "../netinet/in_systm.h"
     57 #include "../netinet/in_var.h"
     58 #include "../netinet/ip.h"
     59 #endif
     60 
     61 #ifdef NS
     62 #include "../netns/ns.h"
     63 #include "../netns/ns_if.h"
     64 #endif
     65 
     66 #ifdef ISO
     67 #include "../netiso/iso.h"
     68 #include "../netiso/iso_var.h"
     69 #endif
     70 
     71 #define	LOMTU	(1024+512)
     72 
     73 struct	ifnet loif;
     74 int	looutput(), loioctl();
     75 
     76 loattach()
     77 {
     78 	register struct ifnet *ifp = &loif;
     79 
     80 	ifp->if_name = "lo";
     81 	ifp->if_mtu = LOMTU;
     82 	ifp->if_flags = IFF_LOOPBACK;
     83 	ifp->if_ioctl = loioctl;
     84 	ifp->if_output = looutput;
     85 	ifp->if_type = IFT_LOOP;
     86 	ifp->if_hdrlen = 0;
     87 	ifp->if_addrlen = 0;
     88 	if_attach(ifp);
     89 }
     90 
     91 looutput(ifp, m, dst, rt)
     92 	struct ifnet *ifp;
     93 	register struct mbuf *m;
     94 	struct sockaddr *dst;
     95 	register struct rtentry *rt;
     96 {
     97 	int s, isr;
     98 	register struct ifqueue *ifq = 0;
     99 
    100 	if ((m->m_flags & M_PKTHDR) == 0)
    101 		panic("looutput no HDR");
    102 	m->m_pkthdr.rcvif = ifp;
    103 
    104 	if (rt && rt->rt_flags & RTF_REJECT) {
    105 		m_freem(m);
    106 		return (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
    107 	}
    108 	ifp->if_opackets++;
    109 	ifp->if_obytes += m->m_pkthdr.len;
    110 	switch (dst->sa_family) {
    111 
    112 #ifdef INET
    113 	case AF_INET:
    114 		ifq = &ipintrq;
    115 		isr = NETISR_IP;
    116 		break;
    117 #endif
    118 #ifdef NS
    119 	case AF_NS:
    120 		ifq = &nsintrq;
    121 		isr = NETISR_NS;
    122 		break;
    123 #endif
    124 #ifdef ISO
    125 	case AF_ISO:
    126 		ifq = &clnlintrq;
    127 		isr = NETISR_ISO;
    128 		break;
    129 #endif
    130 	default:
    131 		printf("lo%d: can't handle af%d\n", ifp->if_unit,
    132 			dst->sa_family);
    133 		m_freem(m);
    134 		return (EAFNOSUPPORT);
    135 	}
    136 	s = splimp();
    137 	if (IF_QFULL(ifq)) {
    138 		IF_DROP(ifq);
    139 		m_freem(m);
    140 		splx(s);
    141 		return (ENOBUFS);
    142 	}
    143 	IF_ENQUEUE(ifq, m);
    144 	schednetisr(isr);
    145 	ifp->if_ipackets++;
    146 	ifp->if_ibytes += m->m_pkthdr.len;
    147 	splx(s);
    148 	return (0);
    149 }
    150 
    151 /* ARGSUSED */
    152 lortrequest(cmd, rt, sa)
    153 struct rtentry *rt;
    154 struct sockaddr *sa;
    155 {
    156 	if (rt)
    157 		rt->rt_rmx.rmx_mtu = LOMTU;
    158 }
    159 
    160 /*
    161  * Process an ioctl request.
    162  */
    163 /* ARGSUSED */
    164 loioctl(ifp, cmd, data)
    165 	register struct ifnet *ifp;
    166 	int cmd;
    167 	caddr_t data;
    168 {
    169 	register struct ifaddr *ifa;
    170 	int error = 0;
    171 
    172 	switch (cmd) {
    173 
    174 	case SIOCSIFADDR:
    175 		ifp->if_flags |= IFF_UP;
    176 		ifa = (struct ifaddr *)data;
    177 		if (ifa != 0 && ifa->ifa_addr->sa_family == AF_ISO)
    178 			ifa->ifa_rtrequest = lortrequest;
    179 		/*
    180 		 * Everything else is done at a higher level.
    181 		 */
    182 		break;
    183 
    184 	default:
    185 		error = EINVAL;
    186 	}
    187 	return (error);
    188 }
    189