NetBSD/sys/net/if_loop.c

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/* $NetBSD: if_loop.c,v 1.36 2001/01/17 04:05:42 itojun 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.
*/
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/*
* Copyright (c) 1982, 1986, 1993
* The Regents of the University of California. All rights reserved.
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*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
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* @(#)if_loop.c 8.2 (Berkeley) 1/9/95
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*/
/*
* Loopback interface driver for protocol testing and timing.
*/
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#include "opt_inet.h"
#include "opt_atalk.h"
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#include "opt_iso.h"
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#include "opt_ns.h"
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#include "bpfilter.h"
#include "loop.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>
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#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
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#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
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#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#endif
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#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
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#endif
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#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
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#ifdef ISO
#include <netiso/iso.h>
#include <netiso/iso_var.h>
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#endif
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#ifdef NETATALK
#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
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struct ifnet loif[NLOOP];
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#ifdef ALTQ
void lostart(struct ifnet *);
#endif
void
loopattach(n)
int n;
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{
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int i;
struct ifnet *ifp;
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for (i = 0; i < NLOOP; i++) {
ifp = &loif[i];
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sprintf(ifp->if_xname, "lo%d", i);
ifp->if_softc = NULL;
ifp->if_mtu = LOMTU;
ifp->if_flags = IFF_LOOPBACK | IFF_MULTICAST;
ifp->if_ioctl = loioctl;
ifp->if_output = looutput;
#ifdef ALTQ
ifp->if_start = lostart;
#endif
ifp->if_type = IFT_LOOP;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
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ifp->if_dlt = DLT_NULL;
IFQ_SET_READY(&ifp->if_snd);
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, sizeof(u_int));
#endif
}
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}
int
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looutput(ifp, m, dst, rt)
struct ifnet *ifp;
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struct mbuf *m;
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struct sockaddr *dst;
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struct rtentry *rt;
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{
int s, isr;
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struct ifqueue *ifq = 0;
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if ((m->m_flags & M_PKTHDR) == 0)
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panic("looutput: no header mbuf");
ifp->if_lastchange = time;
#if NBPFILTER > 0
if (ifp->if_bpf && (ifp->if_flags & IFF_LOOPBACK)) {
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer to it).
*/
struct mbuf m0;
u_int af = dst->sa_family;
m0.m_next = m;
m0.m_len = 4;
m0.m_data = (char *)&af;
bpf_mtap(ifp->if_bpf, &m0);
}
#endif
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m->m_pkthdr.rcvif = ifp;
if (rt && rt->rt_flags & (RTF_REJECT|RTF_BLACKHOLE)) {
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m_freem(m);
return (rt->rt_flags & RTF_BLACKHOLE ? 0 :
rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
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}
#ifndef PULLDOWN_TEST
/*
* KAME requires that the packet to be contiguous on the
* mbuf. We need to make that sure.
* this kind of code should be avoided.
* XXX other conditions to avoid running this part?
*/
if (m->m_len != m->m_pkthdr.len) {
struct mbuf *n = NULL;
int maxlen;
MGETHDR(n, M_DONTWAIT, MT_HEADER);
maxlen = MHLEN;
if (n)
M_COPY_PKTHDR(n, m);
if (n && m->m_pkthdr.len > maxlen) {
MCLGET(n, M_DONTWAIT);
maxlen = MCLBYTES;
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (!n) {
printf("looutput: mbuf allocation failed\n");
m_freem(m);
return ENOBUFS;
}
if (m->m_pkthdr.len <= maxlen) {
m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t));
n->m_len = m->m_pkthdr.len;
n->m_next = NULL;
m_freem(m);
} else {
m_copydata(m, 0, maxlen, mtod(n, caddr_t));
m_adj(m, maxlen);
n->m_len = maxlen;
n->m_next = m;
m->m_flags &= ~M_PKTHDR;
}
m = n;
}
#if 0
if (m && m->m_next != NULL) {
printf("loop: not contiguous...\n");
m_freem(m);
return ENOBUFS;
}
#endif
#endif
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ifp->if_opackets++;
ifp->if_obytes += m->m_pkthdr.len;
#ifdef ALTQ
/*
* ALTQ on the loopback interface is just for debugging. It's
* used only for loopback interfaces, not for a simplex interface.
*/
if ((ALTQ_IS_ENABLED(&ifp->if_snd) || TBR_IS_ENABLED(&ifp->if_snd)) &&
ifp->if_start == lostart) {
struct altq_pktattr pktattr;
int error;
/*
* If the queueing discipline needs packet classification,
* do it before prepending the link headers.
*/
IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr);
M_PREPEND(m, sizeof(uint32_t), M_DONTWAIT);
if (m == NULL)
return (ENOBUFS);
*(mtod(m, uint32_t *)) = dst->sa_family;
s = splimp();
IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error);
(*ifp->if_start)(ifp);
splx(s);
return (error);
}
#endif /* ALTQ */
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switch (dst->sa_family) {
#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
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#ifdef NS
case AF_NS:
ifq = &nsintrq;
isr = NETISR_NS;
break;
#endif
#ifdef ISO
case AF_ISO:
ifq = &clnlintrq;
isr = NETISR_ISO;
break;
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#endif
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#ifdef IPX
case AF_IPX:
ifq = &ipxintrq;
isr = NETISR_IPX;
break;
#endif
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#ifdef NETATALK
case AF_APPLETALK:
ifq = &atintrq2;
isr = NETISR_ATALK;
break;
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#endif
default:
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printf("%s: can't handle af%d\n", ifp->if_xname,
dst->sa_family);
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m_freem(m);
return (EAFNOSUPPORT);
}
s = splimp();
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
void
lostart(struct ifnet *ifp)
{
struct ifqueue *ifq;
struct mbuf *m;
uint32_t af;
int s, isr;
for (;;) {
IFQ_DEQUEUE(&ifp->if_snd, m);
if (m == NULL)
return;
af = *(mtod(m, uint32_t *));
m_adj(m, sizeof(uint32_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 IPX
case AF_IPX:
ifq = &ipxintrq;
isr = NETISR_IPX;
break;
#endif
#ifdef NS
case AF_NS:
ifq = &nsintrq;
isr = NETISR_NS;
break;
#endif
#ifdef ISO
case AF_ISO:
ifq = &clnlintrq;
isr = NETISR_ISO;
break;
#endif
#ifdef NETATALK
case AF_APPLETALK:
ifq = &atintrq2;
isr = NETISR_ATALK;
break;
#endif
default:
printf("%s: can't handle af%d\n", ifp->if_xname, af);
m_freem(m);
return;
}
s = splimp();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
splx(s);
m_freem(m);
return;
}
IF_ENQUEUE(ifq, m);
schednetisr(isr);
ifp->if_ipackets++;
ifp->if_ibytes += m->m_pkthdr.len;
splx(s);
}
}
#endif /* ALTQ */
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/* ARGSUSED */
void
lortrequest(cmd, rt, info)
int cmd;
struct rtentry *rt;
struct rt_addrinfo *info;
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{
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if (rt)
rt->rt_rmx.rmx_mtu = LOMTU;
}
/*
* Process an ioctl request.
*/
/* ARGSUSED */
int
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loioctl(ifp, cmd, data)
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struct ifnet *ifp;
u_long cmd;
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caddr_t data;
{
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struct ifaddr *ifa;
struct ifreq *ifr;
int error = 0;
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switch (cmd) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
ifa = (struct ifaddr *)data;
if (ifa != 0 /*&& ifa->ifa_addr->sa_family == AF_ISO*/)
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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
default:
error = EAFNOSUPPORT;
break;
}
break;
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default:
error = EINVAL;
}
return (error);
}