247 lines
6.0 KiB
C
247 lines
6.0 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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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. 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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*/
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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/malloc.h>
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#include <sys/module.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_private.h>
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#include <net/if_clone.h>
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#include <net/if_types.h>
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#include <net/route.h>
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#include <net/bpf.h>
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#include <net/vnet.h>
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#include "opt_inet.h"
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#include "opt_inet6.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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struct disc_softc {
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struct ifnet *sc_ifp;
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};
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static int discoutput(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct route *);
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static int discioctl(struct ifnet *, u_long, caddr_t);
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static int disc_clone_create(struct if_clone *, int, caddr_t);
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static void disc_clone_destroy(struct ifnet *);
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static const char discname[] = "disc";
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static MALLOC_DEFINE(M_DISC, discname, "Discard interface");
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VNET_DEFINE_STATIC(struct if_clone *, disc_cloner);
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#define V_disc_cloner VNET(disc_cloner)
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static int
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disc_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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{
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struct ifnet *ifp;
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struct disc_softc *sc;
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sc = malloc(sizeof(struct disc_softc), M_DISC, M_WAITOK | M_ZERO);
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ifp = sc->sc_ifp = if_alloc(IFT_LOOP);
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if (ifp == NULL) {
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free(sc, M_DISC);
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return (ENOSPC);
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}
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ifp->if_softc = sc;
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if_initname(ifp, discname, unit);
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ifp->if_mtu = DSMTU;
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/*
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* IFF_LOOPBACK should not be removed from disc's flags because
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* it controls what PF-specific routes are magically added when
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* a network address is assigned to the interface. Things just
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* won't work as intended w/o such routes because the output
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* interface selection for a packet is totally route-driven.
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* A valid alternative to IFF_LOOPBACK can be IFF_BROADCAST or
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* IFF_POINTOPOINT, but it would result in different properties
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* of the interface.
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*/
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ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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ifp->if_drv_flags = IFF_DRV_RUNNING;
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ifp->if_ioctl = discioctl;
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ifp->if_output = discoutput;
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ifp->if_hdrlen = 0;
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ifp->if_addrlen = 0;
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ifp->if_snd.ifq_maxlen = 20;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, sizeof(u_int32_t));
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return (0);
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}
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static void
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disc_clone_destroy(struct ifnet *ifp)
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{
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struct disc_softc *sc;
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sc = ifp->if_softc;
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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free(sc, M_DISC);
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}
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static void
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vnet_disc_init(const void *unused __unused)
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{
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V_disc_cloner = if_clone_simple(discname, disc_clone_create,
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disc_clone_destroy, 0);
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}
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VNET_SYSINIT(vnet_disc_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
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vnet_disc_init, NULL);
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static void
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vnet_disc_uninit(const void *unused __unused)
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{
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if_clone_detach(V_disc_cloner);
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}
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VNET_SYSUNINIT(vnet_disc_uninit, SI_SUB_INIT_IF, SI_ORDER_ANY,
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vnet_disc_uninit, NULL);
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static int
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disc_modevent(module_t mod, int type, void *data)
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{
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switch (type) {
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case MOD_LOAD:
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case MOD_UNLOAD:
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break;
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default:
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return (EOPNOTSUPP);
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}
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return (0);
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}
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static moduledata_t disc_mod = {
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"if_disc",
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disc_modevent,
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NULL
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};
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DECLARE_MODULE(if_disc, disc_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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static int
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discoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
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struct route *ro)
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{
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u_int32_t af;
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M_ASSERTPKTHDR(m);
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/* BPF writes need to be handled specially. */
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if (dst->sa_family == AF_UNSPEC)
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bcopy(dst->sa_data, &af, sizeof(af));
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else
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af = RO_GET_FAMILY(ro, dst);
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if (bpf_peers_present(ifp->if_bpf))
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bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
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m->m_pkthdr.rcvif = ifp;
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if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
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if_inc_counter(ifp, IFCOUNTER_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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/*
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* Process an ioctl request.
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*/
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static int
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discioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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struct ifreq *ifr = (struct ifreq *)data;
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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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/*
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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 == NULL) {
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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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#ifdef INET6
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case AF_INET6:
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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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