1/*
2 * Copyright (c) 1982, 1986, 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

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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 * From: @(#)if_loop.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: head/sys/net/if_disc.c 53115 1999-11-12 19:30:08Z phk $
35 */
36
37/*
38 * Discard interface driver for protocol testing and timing.
39 * (Based on the loopback.)
40 */
41
42#include <sys/param.h>

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78 ifp->if_name = "ds";
79 ifp->if_mtu = DSMTU;
80 ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
81 ifp->if_ioctl = discioctl;
82 ifp->if_output = discoutput;
83 ifp->if_type = IFT_LOOP;
84 ifp->if_hdrlen = 0;
85 ifp->if_addrlen = 0;
86 ifp->if_snd.ifq_maxlen = 20;
87 if_attach(ifp);
88 bpfattach(ifp, DLT_NULL, sizeof(u_int));
89}
90
91static int
92discoutput(ifp, m, dst, rt)
93 struct ifnet *ifp;
94 register struct mbuf *m;

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