Added `ds', a black-hole network interface.
This commit is contained in:
Garrett Wollman
parent
d87bdc80f2
commit
59d8d13f60
@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.119 1994/12/17 08:06:01 jkh Exp $
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# $Id: LINT,v 1.120 1994/12/17 08:37:22 jkh Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -146,13 +146,17 @@ options TPCONS #ISO TP class 0 over X.25
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# aware of the legal and administrative consequences of enabling this
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# option. The number of devices determines the maximum number of
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# simultaneous BPF clients programs runnable.
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# The `disc' pseudo-device implements a minimal network interface,
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# which throws away all packets sent and never receives any. It is
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# included for testing purposes.
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#
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pseudo-device ether #Generic Ethernet
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pseudo-device sppp #Generic Synchronous PPP
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pseudo-device loop #Network loop back device
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pseudo-device loop #Network loopback device
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pseudo-device sl 2 #Serial Line IP
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pseudo-device ppp 2 #Point-to-point protocol
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pseudo-device bpfilter 4 #Berkeley packet filter
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pseudo-device disc #Discard device
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options NSIP #XNS over IP
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options EON #ISO CLNP over IP
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@ -139,6 +139,7 @@ msdosfs/msdosfs_vnops.c optional msdosfs
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net/bpf.c optional bpfilter
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net/bpf_filter.c optional bpfilter
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net/if.c standard
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net/if_disc.c optional disc
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net/if_ethersubr.c optional ether
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net/if_loop.c optional loop
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net/if_ppp.c optional ppp
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@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.119 1994/12/17 08:06:01 jkh Exp $
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# $Id: LINT,v 1.120 1994/12/17 08:37:22 jkh Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -146,13 +146,17 @@ options TPCONS #ISO TP class 0 over X.25
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# aware of the legal and administrative consequences of enabling this
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# option. The number of devices determines the maximum number of
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# simultaneous BPF clients programs runnable.
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# The `disc' pseudo-device implements a minimal network interface,
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# which throws away all packets sent and never receives any. It is
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# included for testing purposes.
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#
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pseudo-device ether #Generic Ethernet
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pseudo-device sppp #Generic Synchronous PPP
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pseudo-device loop #Network loop back device
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pseudo-device loop #Network loopback device
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pseudo-device sl 2 #Serial Line IP
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pseudo-device ppp 2 #Point-to-point protocol
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pseudo-device bpfilter 4 #Berkeley packet filter
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pseudo-device disc #Discard device
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options NSIP #XNS over IP
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options EON #ISO CLNP over IP
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@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.119 1994/12/17 08:06:01 jkh Exp $
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# $Id: LINT,v 1.120 1994/12/17 08:37:22 jkh Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -146,13 +146,17 @@ options TPCONS #ISO TP class 0 over X.25
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# aware of the legal and administrative consequences of enabling this
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# option. The number of devices determines the maximum number of
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# simultaneous BPF clients programs runnable.
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# The `disc' pseudo-device implements a minimal network interface,
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# which throws away all packets sent and never receives any. It is
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# included for testing purposes.
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#
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pseudo-device ether #Generic Ethernet
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pseudo-device sppp #Generic Synchronous PPP
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pseudo-device loop #Network loop back device
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pseudo-device loop #Network loopback device
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pseudo-device sl 2 #Serial Line IP
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pseudo-device ppp 2 #Point-to-point protocol
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pseudo-device bpfilter 4 #Berkeley packet filter
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pseudo-device disc #Discard device
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options NSIP #XNS over IP
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options EON #ISO CLNP over IP
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220
sys/net/if_disc.c
Normal file
220
sys/net/if_disc.c
Normal file
@ -0,0 +1,220 @@
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/*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
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* $Id: if_loop.c,v 1.6 1994/08/08 12:07:25 davidg Exp $
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*/
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/*
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* Discard interface driver for protocol testing and timing.
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* (Based on the loopback.)
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <machine/cpu.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#endif
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#ifdef NS
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#include <netns/ns.h>
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#include <netns/ns_if.h>
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#endif
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#ifdef ISO
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#include <netiso/iso.h>
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#include <netiso/iso_var.h>
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#endif
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#include "bpfilter.h"
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#ifdef TINY_DSMTU
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#define DSMTU (1024+512)
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#else
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#define DSMTU 65532
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#endif
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static struct ifnet dsif;
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static int dsoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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static int dsioctl(struct ifnet *, int, caddr_t);
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/* ARGSUSED */
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static void
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discattach(void)
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{
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register struct ifnet *ifp = &dsif;
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ifp->if_name = "ds";
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ifp->if_mtu = DSMTU;
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_ioctl = dsioctl;
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ifp->if_output = dsoutput;
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ifp->if_type = IFT_LOOP;
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ifp->if_hdrlen = 0;
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ifp->if_addrlen = 0;
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if_attach(ifp);
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#if NBPFILTER > 0
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bpfattach(&ifp->if_bpf, ifp, DLT_NULL, sizeof(u_int));
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#endif
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}
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TEXT_SET(pseudo_set, discattach);
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static int
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dsoutput(ifp, m, dst, rt)
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struct ifnet *ifp;
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register struct mbuf *m;
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struct sockaddr *dst;
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register struct rtentry *rt;
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{
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int s, isr;
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register struct ifqueue *ifq = 0;
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("dsoutput no HDR");
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ifp->if_lastchange = time;
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#if NBPFILTER > 0
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if (dsif.if_bpf) {
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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struct mbuf m0;
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u_int af = dst->sa_family;
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m0.m_next = m;
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m0.m_len = 4;
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m0.m_data = (char *)⁡
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bpf_mtap(dsif.if_bpf, &m0);
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}
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#endif
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m->m_pkthdr.rcvif = ifp;
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if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
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m_freem(m);
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return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
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rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
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}
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ifp->if_opackets++;
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ifp->if_obytes += m->m_pkthdr.len;
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m_freem(m);
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return 0;
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}
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/* ARGSUSED */
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static void
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dsrtrequest(cmd, rt, sa)
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int cmd;
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struct rtentry *rt;
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struct sockaddr *sa;
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{
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if (rt)
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rt->rt_rmx.rmx_mtu = DSMTU;
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}
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/*
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* Process an ioctl request.
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*/
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/* ARGSUSED */
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int
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dsioctl(ifp, cmd, data)
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register struct ifnet *ifp;
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int cmd;
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caddr_t data;
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{
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register struct ifaddr *ifa;
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register struct ifreq *ifr = (struct ifreq *)data;
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register int error = 0;
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switch (cmd) {
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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ifa = (struct ifaddr *)data;
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if (ifa != 0)
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ifa->ifa_rtrequest = dsrtrequest;
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/*
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* Everything else is done at a higher level.
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*/
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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error = EAFNOSUPPORT; /* XXX */
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break;
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}
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switch (ifr->ifr_addr.sa_family) {
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#ifdef INET
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case AF_INET:
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break;
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#endif
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default:
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error = EAFNOSUPPORT;
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break;
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}
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break;
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case SIOCSIFMTU:
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ifp->if_mtu = ifr->ifr_mtu;
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break;
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default:
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error = EINVAL;
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}
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return (error);
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}
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