f25ee08633
really sure why we have a softc list for if_loop, given that it can't be unloaded, but that's an issue to revisit in the future as corrupting the softc list would still cause panics. Reviewed by: benno
394 lines
8.9 KiB
C
394 lines
8.9 KiB
C
/*
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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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* @(#)if_loop.c 8.2 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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/*
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* Loopback interface driver for protocol testing and timing.
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*/
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#include "opt_atalk.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipx.h"
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#include "opt_mac.h"
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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/mac.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/sysctl.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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#include <net/bpfdesc.h>
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#ifdef INET
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#endif
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#ifdef IPX
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#include <netipx/ipx.h>
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#include <netipx/ipx_if.h>
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#endif
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#ifdef INET6
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#ifndef INET
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#include <netinet/in.h>
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#endif
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#include <netinet6/in6_var.h>
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#include <netinet/ip6.h>
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#endif
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#ifdef NETATALK
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#include <netatalk/at.h>
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#include <netatalk/at_var.h>
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#endif
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#ifdef TINY_LOMTU
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#define LOMTU (1024+512)
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#elif defined(LARGE_LOMTU)
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#define LOMTU 131072
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#else
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#define LOMTU 16384
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#endif
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#define LONAME "lo"
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struct lo_softc {
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struct ifnet sc_if; /* network-visible interface */
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LIST_ENTRY(lo_softc) sc_next;
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};
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int loioctl(struct ifnet *, u_long, caddr_t);
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static void lortrequest(int, struct rtentry *, struct rt_addrinfo *);
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int looutput(struct ifnet *ifp, struct mbuf *m,
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struct sockaddr *dst, struct rtentry *rt);
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int lo_clone_create(struct if_clone *, int);
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void lo_clone_destroy(struct ifnet *);
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struct ifnet *loif = NULL; /* Used externally */
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static MALLOC_DEFINE(M_LO, LONAME, "Loopback Interface");
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static struct mtx lo_mtx;
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static LIST_HEAD(lo_list, lo_softc) lo_list;
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struct if_clone lo_cloner = IF_CLONE_INITIALIZER(LONAME,
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lo_clone_create, lo_clone_destroy, 1, IF_MAXUNIT);
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void
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lo_clone_destroy(ifp)
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struct ifnet *ifp;
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{
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struct lo_softc *sc;
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sc = ifp->if_softc;
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/* XXX: destroying lo0 will lead to panics. */
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KASSERT(loif != ifp, ("%s: destroying lo0", __func__));
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mtx_lock(&lo_mtx);
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LIST_REMOVE(sc, sc_next);
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mtx_unlock(&lo_mtx);
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bpfdetach(ifp);
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if_detach(ifp);
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free(sc, M_LO);
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}
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int
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lo_clone_create(ifc, unit)
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struct if_clone *ifc;
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int unit;
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{
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struct lo_softc *sc;
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MALLOC(sc, struct lo_softc *, sizeof(*sc), M_LO, M_WAITOK | M_ZERO);
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if_initname(&sc->sc_if, ifc->ifc_name, unit);
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sc->sc_if.if_mtu = LOMTU;
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sc->sc_if.if_flags = IFF_LOOPBACK | IFF_MULTICAST;
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sc->sc_if.if_ioctl = loioctl;
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sc->sc_if.if_output = looutput;
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sc->sc_if.if_type = IFT_LOOP;
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sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen;
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sc->sc_if.if_softc = sc;
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if_attach(&sc->sc_if);
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bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
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mtx_lock(&lo_mtx);
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LIST_INSERT_HEAD(&lo_list, sc, sc_next);
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mtx_unlock(&lo_mtx);
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if (loif == NULL)
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loif = &sc->sc_if;
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return (0);
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}
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static int
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loop_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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mtx_init(&lo_mtx, "lo_mtx", NULL, MTX_DEF);
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LIST_INIT(&lo_list);
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if_clone_attach(&lo_cloner);
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break;
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case MOD_UNLOAD:
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printf("loop module unload - not possible for this module type\n");
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return EINVAL;
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}
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return 0;
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}
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static moduledata_t loop_mod = {
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"loop",
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loop_modevent,
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0
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};
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DECLARE_MODULE(loop, loop_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
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int
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looutput(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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M_ASSERTPKTHDR(m); /* check if we have the packet header */
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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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#if 1 /* XXX */
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switch (dst->sa_family) {
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case AF_INET:
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case AF_INET6:
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case AF_IPX:
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case AF_APPLETALK:
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break;
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default:
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printf("looutput: af=%d unexpected\n", dst->sa_family);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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#endif
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return(if_simloop(ifp, m, dst->sa_family, 0));
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}
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/*
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* if_simloop()
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*
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* This function is to support software emulation of hardware loopback,
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* i.e., for interfaces with the IFF_SIMPLEX attribute. Since they can't
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* hear their own broadcasts, we create a copy of the packet that we
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* would normally receive via a hardware loopback.
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*
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* This function expects the packet to include the media header of length hlen.
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*/
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int
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if_simloop(ifp, m, af, hlen)
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struct ifnet *ifp;
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struct mbuf *m;
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int af;
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int hlen;
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{
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int isr;
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M_ASSERTPKTHDR(m);
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m_tag_delete_nonpersistent(m);
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m->m_pkthdr.rcvif = ifp;
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/* BPF write needs to be handled specially */
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if (af == AF_UNSPEC) {
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KASSERT(m->m_len >= sizeof(int), ("if_simloop: m_len"));
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af = *(mtod(m, int *));
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m->m_len -= sizeof(int);
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m->m_pkthdr.len -= sizeof(int);
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m->m_data += sizeof(int);
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}
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/* Let BPF see incoming packet */
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if (ifp->if_bpf) {
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if (ifp->if_bpf->bif_dlt == DLT_NULL) {
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u_int32_t af1 = af; /* XXX beware sizeof(af) != 4 */
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/*
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* We need to prepend the address family.
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*/
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bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
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} else
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bpf_mtap(ifp->if_bpf, m);
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}
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/* Strip away media header */
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if (hlen > 0) {
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m_adj(m, hlen);
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#if defined(__alpha__) || defined(__ia64__) || defined(__sparc64__)
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/* The alpha doesn't like unaligned data.
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* We move data down in the first mbuf */
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if (mtod(m, vm_offset_t) & 3) {
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KASSERT(hlen >= 3, ("if_simloop: hlen too small"));
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bcopy(m->m_data,
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(char *)(mtod(m, vm_offset_t)
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- (mtod(m, vm_offset_t) & 3)),
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m->m_len);
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mtod(m,vm_offset_t) -= (mtod(m, vm_offset_t) & 3);
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}
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#endif
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}
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/* Deliver to upper layer protocol */
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switch (af) {
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#ifdef INET
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case AF_INET:
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isr = NETISR_IP;
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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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m->m_flags |= M_LOOP;
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isr = NETISR_IPV6;
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break;
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#endif
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#ifdef IPX
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case AF_IPX:
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isr = NETISR_IPX;
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break;
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#endif
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#ifdef NETATALK
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case AF_APPLETALK:
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isr = NETISR_ATALK2;
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break;
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#endif
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default:
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printf("if_simloop: can't handle af=%d\n", af);
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m_freem(m);
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return (EAFNOSUPPORT);
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}
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ifp->if_ipackets++;
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ifp->if_ibytes += m->m_pkthdr.len;
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netisr_queue(isr, 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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lortrequest(cmd, rt, info)
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int cmd;
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struct rtentry *rt;
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struct rt_addrinfo *info;
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{
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RT_LOCK_ASSERT(rt);
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if (rt)
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rt->rt_rmx.rmx_mtu = rt->rt_ifp->if_mtu;
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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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loioctl(ifp, cmd, data)
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register struct ifnet *ifp;
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u_long 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 | IFF_RUNNING;
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ifa = (struct ifaddr *)data;
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ifa->ifa_rtrequest = lortrequest;
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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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#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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case SIOCSIFFLAGS:
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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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