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/* $OpenBSD: if_loop.c,v 1.91 2020/07/22 02:16:01 dlg Exp $ */
/* $NetBSD: if_loop.c,v 1.15 1996/05/07 02:40:33 thorpej Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)if_loop.c 8.1 (Berkeley) 6/10/93
*/
/*
* @(#)COPYRIGHT 1.1 (NRL) 17 January 1995
*
* NRL grants permission for redistribution and use in source and binary
* forms, with or without modification, of the software and documentation
* created at NRL provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgements:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* This product includes software developed at the Information
* Technology Division, US Naval Research Laboratory.
* 4. Neither the name of the NRL nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NRL OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation
* are those of the authors and should not be interpreted as representing
* official policies, either expressed or implied, of the US Naval
* Research Laboratory (NRL).
*/
/*
* Loopback interface driver for protocol testing and timing.
*/
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/rtable.h>
#include <net/route.h>
#include <netinet/in.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif
#ifdef MPLS
#include <netmpls/mpls.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#define LOMTU 32768
int loioctl(struct ifnet *, u_long, caddr_t);
void loopattach(int);
void lortrequest(struct ifnet *, int, struct rtentry *);
void loinput(struct ifnet *, struct mbuf *);
int looutput(struct ifnet *,
struct mbuf *, struct sockaddr *, struct rtentry *);
int loop_clone_create(struct if_clone *, int);
int loop_clone_destroy(struct ifnet *);
struct if_clone loop_cloner =
IF_CLONE_INITIALIZER("lo", loop_clone_create, loop_clone_destroy);
void
loopattach(int n)
{
if (loop_clone_create(&loop_cloner, 0))
panic("unable to create lo0");
if_clone_attach(&loop_cloner);
}
int
loop_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
ifp = malloc(sizeof(*ifp), M_DEVBUF, M_WAITOK|M_ZERO);
snprintf(ifp->if_xname, sizeof ifp->if_xname, "lo%d", unit);
ifp->if_softc = NULL;
ifp->if_mtu = LOMTU;
ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
ifp->if_xflags = IFXF_CLONED;
ifp->if_rtrequest = lortrequest;
ifp->if_ioctl = loioctl;
ifp->if_input = loinput;
ifp->if_output = looutput;
ifp->if_type = IFT_LOOP;
ifp->if_hdrlen = sizeof(u_int32_t);
if (unit == 0) {
if_attachhead(ifp);
if_addgroup(ifp, ifc->ifc_name);
rtable_l2set(0, 0, ifp->if_index);
} else
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&ifp->if_bpf, ifp, DLT_LOOP, sizeof(u_int32_t));
#endif
return (0);
}
int
loop_clone_destroy(struct ifnet *ifp)
{
struct ifnet *p;
unsigned int rdomain = 0;
if (ifp->if_index == rtable_loindex(ifp->if_rdomain)) {
/* rdomain 0 always needs a loopback */
if (ifp->if_rdomain == 0)
return (EPERM);
/* if there is any other interface in this rdomain, deny */
NET_LOCK();
TAILQ_FOREACH(p, &ifnet, if_list) {
if (p->if_rdomain != ifp->if_rdomain)
continue;
if (p->if_index == ifp->if_index)
continue;
NET_UNLOCK();
return (EBUSY);
}
NET_UNLOCK();
rdomain = ifp->if_rdomain;
}
if_detach(ifp);
free(ifp, M_DEVBUF, sizeof(*ifp));
if (rdomain)
rtable_l2set(rdomain, 0, 0);
return (0);
}
void
loinput(struct ifnet *ifp, struct mbuf *m)
{
int error;
if ((m->m_flags & M_PKTHDR) == 0)
panic("%s: no header mbuf", __func__);
error = if_input_local(ifp, m, m->m_pkthdr.ph_family);
if (error)
ifp->if_ierrors++;
}
int
looutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
if ((m->m_flags & M_PKTHDR) == 0)
panic("%s: no header mbuf", __func__);
if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
m_freem(m);
return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
}
/*
* Do not call if_input_local() directly. Queue the packet to avoid
* stack overflow and make TCP handshake over loopback work.
*/
return (if_output_local(ifp, m, dst->sa_family));
}
void
lortrequest(struct ifnet *ifp, int cmd, struct rtentry *rt)
{
if (rt && rt->rt_mtu == 0)
rt->rt_mtu = LOMTU;
}
/*
* Process an ioctl request.
*/
int
loioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct ifreq *ifr;
int error = 0;
switch (cmd) {
case SIOCSIFFLAGS:
break;
case SIOCSIFADDR:
ifp->if_flags |= IFF_RUNNING;
if_up(ifp); /* send up RTM_IFINFO */
/*
* Everything else is done at a higher level.
*/
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
break;
case SIOCSIFMTU:
ifr = (struct ifreq *)data;
ifp->if_mtu = ifr->ifr_mtu;
break;
default:
error = ENOTTY;
}
return (error);
}
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