File: [local] / sys / net / if_loop.c (download)
Revision 1.1, Tue Mar 4 16:16:25 2008 UTC (16 years, 6 months ago) by nbrk
Branch point for: MAIN
Initial revision
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/* $OpenBSD: if_loop.c,v 1.41 2007/06/06 10:04:36 henning 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 <machine/cpu.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#endif
#ifdef NETATALK
#include <netinet/if_ether.h>
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#endif
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#if defined(LARGE_LOMTU)
#define LOMTU (131072 + MHLEN + MLEN)
#else
#define LOMTU (32768 + MHLEN + MLEN)
#endif
#ifdef ALTQ
static void lo_altqstart(struct ifnet *);
#endif
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);
/* ARGSUSED */
void
loopattach(n)
int n;
{
(void) loop_clone_create(&loop_cloner, 0);
if_clone_attach(&loop_cloner);
}
int
loop_clone_create(ifc, unit)
struct if_clone *ifc;
int unit;
{
struct ifnet *ifp;
MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_DEVBUF, M_NOWAIT);
if (ifp == NULL)
return (ENOMEM);
bzero(ifp, sizeof(struct ifnet));
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_ioctl = loioctl;
ifp->if_output = looutput;
ifp->if_type = IFT_LOOP;
ifp->if_hdrlen = sizeof(u_int32_t);
ifp->if_addrlen = 0;
IFQ_SET_READY(&ifp->if_snd);
#ifdef ALTQ
ifp->if_start = lo_altqstart;
#endif
if (unit == 0) {
lo0ifp = ifp;
if_attachhead(ifp);
if_addgroup(lo0ifp, ifc->ifc_name);
} 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(ifp)
struct ifnet *ifp;
{
if (ifp == lo0ifp)
return (EPERM);
if_detach(ifp);
free(ifp, M_DEVBUF);
return (0);
}
int
looutput(ifp, m, dst, rt)
struct ifnet *ifp;
struct mbuf *m;
struct sockaddr *dst;
struct rtentry *rt;
{
int s, isr;
struct ifqueue *ifq = 0;
if ((m->m_flags & M_PKTHDR) == 0)
panic("looutput: no header mbuf");
#if NBPFILTER > 0
/*
* only send packets to bpf if they are real loopback packets;
* looutput() is also called for SIMPLEX interfaces to duplicate
* packets for local use. But don't dup them to bpf.
*/
if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK))
bpf_mtap_af(ifp->if_bpf, htonl(dst->sa_family), m,
BPF_DIRECTION_OUT);
#endif
m->m_pkthdr.rcvif = ifp;
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);
}
ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
#ifdef ALTQ
/*
* altq for loop is just for debugging.
* only used when called for loop interface (not for
* a simplex interface).
*/
if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd))
&& ifp->if_start == lo_altqstart) {
int32_t *afp;
int error;
M_PREPEND(m, sizeof(int32_t), M_DONTWAIT);
if (m == 0)
return (ENOBUFS);
afp = mtod(m, int32_t *);
*afp = (int32_t)dst->sa_family;
s = splnet();
IFQ_ENQUEUE(&ifp->if_snd, m, NULL, error);
(*ifp->if_start)(ifp);
splx(s);
return (error);
}
#endif /* ALTQ */
switch (dst->sa_family) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
ifq = &ip6intrq;
isr = NETISR_IPV6;
break;
#endif /* INET6 */
#ifdef NETATALK
case AF_APPLETALK:
ifq = &atintrq2;
isr = NETISR_ATALK;
break;
#endif /* NETATALK */
default:
printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
m_freem(m);
return (EAFNOSUPPORT);
}
s = splnet();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
m_freem(m);
splx(s);
return (ENOBUFS);
}
IF_ENQUEUE(ifq, m);
schednetisr(isr);
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
splx(s);
return (0);
}
#ifdef ALTQ
static void
lo_altqstart(ifp)
struct ifnet *ifp;
{
struct ifqueue *ifq;
struct mbuf *m;
int32_t af, *afp;
int s, isr;
while (1) {
s = splnet();
IFQ_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
afp = mtod(m, int32_t *);
af = *afp;
m_adj(m, sizeof(int32_t));
switch (af) {
#ifdef INET
case AF_INET:
ifq = &ipintrq;
isr = NETISR_IP;
break;
#endif
#ifdef INET6
case AF_INET6:
m->m_flags |= M_LOOP;
ifq = &ip6intrq;
isr = NETISR_IPV6;
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
ifq = &atintrq2;
isr = NETISR_ATALK;
break;
#endif /* NETATALK */
default:
printf("lo_altqstart: can't handle af%d\n", af);
m_freem(m);
return;
}
s = splnet();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
m_freem(m);
splx(s);
return;
}
IF_ENQUEUE(ifq, m);
schednetisr(isr);
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
splx(s);
}
}
#endif /* ALTQ */
/* ARGSUSED */
void
lortrequest(cmd, rt, info)
int cmd;
struct rtentry *rt;
struct rt_addrinfo *info;
{
if (rt)
rt->rt_rmx.rmx_mtu = LOMTU;
}
/*
* Process an ioctl request.
*/
/* ARGSUSED */
int
loioctl(ifp, cmd, data)
struct ifnet *ifp;
u_long cmd;
caddr_t data;
{
struct ifaddr *ifa;
struct ifreq *ifr;
int error = 0;
switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP | IFF_RUNNING;
ifa = (struct ifaddr *)data;
if (ifa != 0)
ifa->ifa_rtrequest = lortrequest;
/*
* Everything else is done at a higher level.
*/
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
ifr = (struct ifreq *)data;
if (ifr == 0) {
error = EAFNOSUPPORT; /* XXX */
break;
}
switch (ifr->ifr_addr.sa_family) {
#ifdef INET
case AF_INET:
break;
#endif
#ifdef INET6
case AF_INET6:
break;
#endif /* INET6 */
default:
error = EAFNOSUPPORT;
break;
}
break;
case SIOCSIFMTU:
ifr = (struct ifreq *)data;
ifp->if_mtu = ifr->ifr_mtu;
break;
default:
error = EINVAL;
}
return (error);
}