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NetBSD/sys/net/if_etherip.c

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/* $NetBSD: if_etherip.c,v 1.9 2007/07/14 21:02:39 ad Exp $ */
/*
* Copyright (c) 2006, Hans Rosenfeld <rosenfeld@grumpf.hope-2000.org>
* 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 Hans Rosenfeld nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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) 2003, 2004 The NetBSD Foundation.
* All rights reserved.
*
* This code is derived from software contributed to the NetBSD Foundation
* by Quentin Garnier
*
* 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 NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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) 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.
*/
#include <sys/cdefs.h>
#include "opt_inet.h"
#include "bpfilter.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/sysctl.h>
#include <sys/queue.h>
#include <sys/kauth.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_ether.h>
#include <net/if_media.h>
#include <net/route.h>
#include <net/if_etherip.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#ifdef INET
#include <netinet/in_var.h>
#endif /* INET */
#include <netinet/ip_etherip.h>
#ifdef INET6
#include <netinet6/ip6_etherip.h>
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/in6_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_gif.h>
#include <netinet6/ip6protosw.h>
#endif /* INET6 */
#include <compat/sys/sockio.h>
static int etherip_node;
static int etherip_sysctl_handler(SYSCTLFN_PROTO);
SYSCTL_SETUP_PROTO(sysctl_etherip_setup);
void etheripattach(int);
static int etherip_match(struct device *, struct cfdata *, void *);
static void etherip_attach(struct device *, struct device *, void *);
static int etherip_detach(struct device *, int);
CFATTACH_DECL(etherip, sizeof(struct etherip_softc),
etherip_match, etherip_attach, etherip_detach, NULL);
extern struct cfdriver etherip_cd;
static void etherip_start(struct ifnet *);
static void etherip_stop(struct ifnet *, int);
static int etherip_init(struct ifnet *);
static int etherip_ioctl(struct ifnet *, u_long, void *);
static int etherip_mediachange(struct ifnet *);
static void etherip_mediastatus(struct ifnet *, struct ifmediareq *);
static int etherip_clone_create(struct if_clone *, int);
static int etherip_clone_destroy(struct ifnet *);
static struct if_clone etherip_cloners = IF_CLONE_INITIALIZER(
"etherip", etherip_clone_create, etherip_clone_destroy);
static int etherip_set_tunnel(struct ifnet *,
struct sockaddr *, struct sockaddr *);
static void etherip_delete_tunnel(struct ifnet *);
static void etheripintr(void *);
void
etheripattach(int count)
{
int error;
error = config_cfattach_attach(etherip_cd.cd_name, &etherip_ca);
if (error) {
aprint_error("%s: unable to register cfattach\n",
etherip_cd.cd_name);
(void)config_cfdriver_detach(&etherip_cd);
return;
}
LIST_INIT(&etherip_softc_list);
if_clone_attach(&etherip_cloners);
}
/* Pretty much useless for a pseudo-device */
static int
etherip_match(struct device *self, struct cfdata *cfdata, void *arg)
{
return 1;
}
static void
etherip_attach(struct device *parent, struct device *self, void *aux)
{
struct etherip_softc *sc = (struct etherip_softc *)self;
struct ifnet *ifp;
const struct sysctlnode *node;
u_int8_t enaddr[ETHER_ADDR_LEN] =
{ 0xf2, 0x0b, 0xa5, 0xff, 0xff, 0xff };
char enaddrstr[3 * ETHER_ADDR_LEN];
struct timeval tv;
uint32_t ui;
int error;
sc->sc_si = NULL;
sc->sc_src = NULL;
sc->sc_dst = NULL;
/*
* In order to obtain unique initial Ethernet address on a host,
* do some randomisation using the current uptime. It's not meant
* for anything but avoiding hard-coding an address.
*/
getmicrouptime(&tv);
ui = (tv.tv_sec ^ tv.tv_usec) & 0xffffff;
memcpy(enaddr+3, (u_int8_t *)&ui, 3);
aprint_verbose("%s: Ethernet address %s\n", sc->sc_dev.dv_xname,
ether_snprintf(enaddrstr, sizeof(enaddrstr), enaddr));
/*
* Why 1000baseT? Why not? You can add more.
*
* Note that there are 3 steps: init, one or several additions to
* list of supported media, and in the end, the selection of one
* of them.
*/
ifmedia_init(&sc->sc_im, 0, etherip_mediachange, etherip_mediastatus);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_1000_T, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_1000_T|IFM_FDX, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_100_TX, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_10_T, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
ifmedia_add(&sc->sc_im, IFM_ETHER|IFM_AUTO, 0, NULL);
ifmedia_set(&sc->sc_im, IFM_ETHER|IFM_AUTO);
/*
* One should note that an interface must do multicast in order
* to support IPv6.
*/
ifp = &sc->sc_ec.ec_if;
strcpy(ifp->if_xname, sc->sc_dev.dv_xname);
ifp->if_softc = sc;
ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_ioctl = etherip_ioctl;
ifp->if_start = etherip_start;
ifp->if_stop = etherip_stop;
ifp->if_init = etherip_init;
IFQ_SET_READY(&ifp->if_snd);
sc->sc_ec.ec_capabilities = ETHERCAP_VLAN_MTU | ETHERCAP_JUMBO_MTU;
/*
* Those steps are mandatory for an Ethernet driver, the first call
* being common to all network interface drivers.
*/
if_attach(ifp);
ether_ifattach(ifp, enaddr);
/*
* Add a sysctl node for that interface.
*
* The pointer transmitted is not a string, but instead a pointer to
* the softc structure, which we can use to build the string value on
* the fly in the helper function of the node. See the comments for
* etherip_sysctl_handler for details.
*/
error = sysctl_createv(NULL, 0, NULL, &node, CTLFLAG_READWRITE,
CTLTYPE_STRING, sc->sc_dev.dv_xname, NULL,
etherip_sysctl_handler, 0, sc, 18, CTL_NET,
AF_LINK, etherip_node, device_unit(&sc->sc_dev),
CTL_EOL);
if (error)
aprint_error("%s: sysctl_createv returned %d, ignoring\n",
sc->sc_dev.dv_xname, error);
/* insert into etherip_softc_list */
LIST_INSERT_HEAD(&etherip_softc_list, sc, etherip_list);
}
/*
* When detaching, we do the inverse of what is done in the attach
* routine, in reversed order.
*/
static int
etherip_detach(struct device* self, int flags)
{
struct etherip_softc *sc = (struct etherip_softc *)self;
struct ifnet *ifp = &sc->sc_ec.ec_if;
int error, s;
s = splnet();
etherip_stop(ifp, 1);
if_down(ifp);
splx(s);
/*
* Destroying a single leaf is a very straightforward operation using
* sysctl_destroyv. One should be sure to always end the path with
* CTL_EOL.
*/
error = sysctl_destroyv(NULL, CTL_NET, AF_LINK, etherip_node,
device_unit(&sc->sc_dev), CTL_EOL);
if (error)
aprint_error("%s: sysctl_destroyv returned %d, ignoring\n",
sc->sc_dev.dv_xname, error);
LIST_REMOVE(sc, etherip_list);
etherip_delete_tunnel(ifp);
ether_ifdetach(ifp);
if_detach(ifp);
rtcache_free(&sc->sc_ro);
ifmedia_delete_instance(&sc->sc_im, IFM_INST_ANY);
return 0;
}
/*
* This function is called by the ifmedia layer to notify the driver
* that the user requested a media change. A real driver would
* reconfigure the hardware.
*/
static int
etherip_mediachange(struct ifnet *ifp)
{
return 0;
}
/*
* Here the user asks for the currently used media.
*/
static void
etherip_mediastatus(struct ifnet *ifp, struct ifmediareq *imr)
{
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
imr->ifm_active = sc->sc_im.ifm_cur->ifm_media;
}
static void
etherip_start(struct ifnet *ifp)
{
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
if(sc->sc_si)
softintr_schedule(sc->sc_si);
}
static void
etheripintr(void *arg)
{
struct etherip_softc *sc = (struct etherip_softc *)arg;;
struct ifnet *ifp = &sc->sc_ec.ec_if;;
struct mbuf *m;
int s, error;
for (;;) {
s = splnet();
IFQ_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
#if NBPFILTER > 0
if (ifp->if_bpf)
bpf_mtap(ifp->if_bpf, m);
#endif
ifp->if_opackets++;
if (sc->sc_src && sc->sc_dst) {
ifp->if_flags |= IFF_OACTIVE;
switch (sc->sc_src->sa_family) {
#ifdef INET
case AF_INET:
error = ip_etherip_output(ifp, m);
break;
#endif
#ifdef INET6
case AF_INET6:
error = ip6_etherip_output(ifp, m);
break;
#endif
default:
error = ENETDOWN;
}
ifp->if_flags &= ~IFF_OACTIVE;
} else m_freem(m);
}
}
static int
etherip_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
struct ifreq *ifr = data;
struct sockaddr *src, *dst;
int s, error;
switch (cmd) {
case SIOCSLIFPHYADDR:
src = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
/* sa_family must be equal */
if (src->sa_family != dst->sa_family)
return EINVAL;
/* validate sa_len */
switch (src->sa_family) {
#ifdef INET
case AF_INET:
if (src->sa_len != sizeof(struct sockaddr_in) ||
dst->sa_len != sizeof(struct sockaddr_in))
return EINVAL;
break;
#endif
#ifdef INET6
case AF_INET6:
if (src->sa_len != sizeof(struct sockaddr_in6) ||
dst->sa_len != sizeof(struct sockaddr_in6))
return EINVAL;
break;
#endif
default:
return EAFNOSUPPORT;
}
error = etherip_set_tunnel(ifp, src, dst);
break;
case SIOCDIFPHYADDR:
etherip_delete_tunnel(ifp);
error = 0;
break;
case SIOCGLIFPHYADDR:
if (sc->sc_src == NULL || sc->sc_dst == NULL)
return EADDRNOTAVAIL;
/* copy src */
src = sc->sc_src;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->addr);
if (src->sa_len > sizeof(((struct if_laddrreq *)data)->addr))
return EINVAL;
memcpy(dst, src, src->sa_len);
/* copy dst */
src = sc->sc_dst;
dst = (struct sockaddr *)
&(((struct if_laddrreq *)data)->dstaddr);
if (src->sa_len > sizeof(((struct if_laddrreq *)data)->dstaddr))
return EINVAL;
memcpy(dst, src, src->sa_len);
error = 0;
break;
#ifdef OSIOCSIFMEDIA
case OSIOCSIFMEDIA:
#endif
case SIOCSIFMEDIA:
case SIOCGIFMEDIA:
s = splnet();
error = ifmedia_ioctl(ifp, ifr, &sc->sc_im, cmd);
splx(s);
break;
default:
s = splnet();
error = ether_ioctl(ifp, cmd, data);
splx(s);
if (error == ENETRESET)
error = 0;
break;
}
return (error);
}
static int
etherip_set_tunnel(struct ifnet *ifp,
struct sockaddr *src,
struct sockaddr *dst)
{
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
struct etherip_softc *sc2;
struct sockaddr *osrc, *odst;
int s, error = 0;
s = splsoftnet();
LIST_FOREACH(sc2, &etherip_softc_list, etherip_list) {
if (sc2 == sc)
continue;
if (!sc2->sc_dst || !sc2->sc_src)
continue;
if (sc2->sc_dst->sa_family != dst->sa_family ||
sc2->sc_dst->sa_len != dst->sa_len ||
sc2->sc_src->sa_family != src->sa_family ||
sc2->sc_src->sa_len != src->sa_len)
continue;
/* can't configure same pair of address onto two tunnels */
if (bcmp(sc2->sc_dst, dst, dst->sa_len) == 0 &&
bcmp(sc2->sc_src, src, src->sa_len) == 0) {
error = EADDRNOTAVAIL;
goto out;
}
/* XXX both end must be valid? (I mean, not 0.0.0.0) */
}
if (sc->sc_si) {
softintr_disestablish(sc->sc_si);
sc->sc_si = NULL;
}
ifp->if_flags &= ~IFF_RUNNING;
osrc = sc->sc_src; sc->sc_src = NULL;
odst = sc->sc_dst; sc->sc_dst = NULL;
sc->sc_src = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
memcpy(sc->sc_src, src, src->sa_len);
if (osrc) FREE(osrc, M_IFADDR);
sc->sc_dst = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
memcpy(sc->sc_dst, dst, dst->sa_len);
if (odst) FREE(odst, M_IFADDR);
ifp->if_flags |= IFF_RUNNING;
sc->sc_si = softintr_establish(IPL_SOFTNET, etheripintr, sc);
if (sc->sc_si == NULL)
error = ENOMEM;
out:
splx(s);
return(error);
}
static void
etherip_delete_tunnel(struct ifnet *ifp)
{
struct etherip_softc *sc = (struct etherip_softc *)ifp->if_softc;
int s;
s = splsoftnet();
if (sc->sc_si) {
softintr_disestablish(sc->sc_si);
sc->sc_si = NULL;
}
if (sc->sc_src) {
FREE(sc->sc_src, M_IFADDR);
sc->sc_src = NULL;
}
if (sc->sc_dst) {
FREE(sc->sc_dst, M_IFADDR);
sc->sc_dst = NULL;
}
ifp->if_flags &= ~IFF_RUNNING;
splx(s);
}
static int
etherip_init(struct ifnet *ifp)
{
struct etherip_softc *sc = ifp->if_softc;
if (sc->sc_si == NULL)
sc->sc_si = softintr_establish(IPL_SOFTNET, etheripintr, sc);
if (sc->sc_si == NULL)
return(ENOMEM);
ifp->if_flags |= IFF_RUNNING;
etherip_start(ifp);
return 0;
}
static void
etherip_stop(struct ifnet *ifp, int disable)
{
ifp->if_flags &= ~IFF_RUNNING;
}
static int
etherip_clone_create(struct if_clone *ifc, int unit)
{
struct cfdata *cf;
MALLOC(cf, struct cfdata *, sizeof(struct cfdata), M_DEVBUF, M_WAITOK);
cf->cf_name = etherip_cd.cd_name;
cf->cf_atname = etherip_ca.ca_name;
cf->cf_unit = unit;
cf->cf_fstate = FSTATE_STAR;
if (config_attach_pseudo(cf) == NULL) {
aprint_error("%s%d: unable to attach an instance\n",
etherip_cd.cd_name, unit);
return (ENXIO);
}
return 0;
}
static int
etherip_clone_destroy(struct ifnet *ifp)
{
struct device *dev = (struct device *)ifp->if_softc;
struct cfdata *cf = device_cfdata(dev);
int error;
if ((error = config_detach(dev, 0)) != 0)
aprint_error("%s: unable to detach instance\n",
dev->dv_xname);
FREE(cf, M_DEVBUF);
return error;
}
SYSCTL_SETUP(sysctl_etherip_setup, "sysctl net.link.etherip subtree setup")
{
const struct sysctlnode *node;
int error = 0;
error = sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "net", NULL,
NULL, 0, NULL, 0,
CTL_NET, CTL_EOL);
if (error)
return;
error = sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "link", NULL,
NULL, 0, NULL, 0,
CTL_NET, AF_LINK, CTL_EOL);
if (error)
return;
error = sysctl_createv(clog, 0, NULL, &node,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "etherip", NULL,
NULL, 0, NULL, 0,
CTL_NET, AF_LINK, CTL_CREATE, CTL_EOL);
if (error)
return;
etherip_node = node->sysctl_num;
}
static int
etherip_sysctl_handler(SYSCTLFN_ARGS)
{
struct sysctlnode node;
struct etherip_softc *sc;
struct ifnet *ifp;
int error;
size_t len;
char addr[3 * ETHER_ADDR_LEN];
node = *rnode;
sc = node.sysctl_data;
ifp = &sc->sc_ec.ec_if;
(void)ether_snprintf(addr, sizeof(addr), LLADDR(ifp->if_sadl));
node.sysctl_data = addr;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return error;
len = strlen(addr);
if (len < 11 || len > 17)
return EINVAL;
/* Commit change */
if (ether_nonstatic_aton(LLADDR(ifp->if_sadl), addr) != 0)
return EINVAL;
return error;
}
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