17d5cb2d12
- Add gif_mtx, which protects globals. - Hold gif_mtx around manipulation of gif_softc_list. - Abstract gif destruction code into gif_destroy(), which tears down a softc after it's been removed from the global list by either module unload or clone destroy. - Lock gif_called, even though we know gif_called is broken with reentrant network processing. - Document an event ordering problem in gif_set_tunnel() that will need to be fixed. gif_softc fields not locked down in this commit.
878 lines
19 KiB
C
878 lines
19 KiB
C
/* $FreeBSD$ */
|
|
/* $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 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.
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#include "opt_mac.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/mac.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/errno.h>
|
|
#include <sys/time.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/syslog.h>
|
|
#include <sys/protosw.h>
|
|
#include <sys/conf.h>
|
|
#include <machine/cpu.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
#include <net/netisr.h>
|
|
#include <net/route.h>
|
|
#include <net/bpf.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#ifdef INET
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/in_gif.h>
|
|
#include <netinet/ip_var.h>
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
#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 <netinet/ip_encap.h>
|
|
#include <net/if_gif.h>
|
|
|
|
#include <net/net_osdep.h>
|
|
|
|
#define GIFNAME "gif"
|
|
|
|
/*
|
|
* gif_mtx protects the global gif_softc_list, and access to gif_called.
|
|
* XXX: See comment blow on gif_called.
|
|
* XXX: Per-softc locking is still required.
|
|
*/
|
|
static struct mtx gif_mtx;
|
|
static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
|
|
static LIST_HEAD(, gif_softc) gif_softc_list;
|
|
|
|
/*
|
|
* XXX: gif_called is a recursion counter to prevent misconfiguration to
|
|
* cause unbounded looping in the network stack. However, this is a flawed
|
|
* approach as it assumes non-reentrance in the stack. This should be
|
|
* changed to use packet tags to track recusion..
|
|
*/
|
|
static int gif_called = 0;
|
|
|
|
void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
|
|
void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
|
|
void (*ng_gif_attach_p)(struct ifnet *ifp);
|
|
void (*ng_gif_detach_p)(struct ifnet *ifp);
|
|
|
|
int gif_clone_create(struct if_clone *, int);
|
|
void gif_clone_destroy(struct ifnet *);
|
|
|
|
struct if_clone gif_cloner = IF_CLONE_INITIALIZER("gif",
|
|
gif_clone_create, gif_clone_destroy, 0, IF_MAXUNIT);
|
|
|
|
static int gifmodevent(module_t, int, void *);
|
|
|
|
SYSCTL_DECL(_net_link);
|
|
SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
|
|
"Generic Tunnel Interface");
|
|
#ifndef MAX_GIF_NEST
|
|
/*
|
|
* This macro controls the default upper limitation on nesting of gif tunnels.
|
|
* Since, setting a large value to this macro with a careless configuration
|
|
* may introduce system crash, we don't allow any nestings by default.
|
|
* If you need to configure nested gif tunnels, you can define this macro
|
|
* in your kernel configuration file. However, if you do so, please be
|
|
* careful to configure the tunnels so that it won't make a loop.
|
|
*/
|
|
#define MAX_GIF_NEST 1
|
|
#endif
|
|
static int max_gif_nesting = MAX_GIF_NEST;
|
|
SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW,
|
|
&max_gif_nesting, 0, "Max nested tunnels");
|
|
|
|
/*
|
|
* By default, we disallow creation of multiple tunnels between the same
|
|
* pair of addresses. Some applications require this functionality so
|
|
* we allow control over this check here.
|
|
*/
|
|
#ifdef XBONEHACK
|
|
static int parallel_tunnels = 1;
|
|
#else
|
|
static int parallel_tunnels = 0;
|
|
#endif
|
|
SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW,
|
|
¶llel_tunnels, 0, "Allow parallel tunnels?");
|
|
|
|
int
|
|
gif_clone_create(ifc, unit)
|
|
struct if_clone *ifc;
|
|
int unit;
|
|
{
|
|
struct gif_softc *sc;
|
|
|
|
sc = malloc (sizeof(struct gif_softc), M_GIF, M_WAITOK);
|
|
bzero(sc, sizeof(struct gif_softc));
|
|
|
|
sc->gif_if.if_softc = sc;
|
|
if_initname(&sc->gif_if, ifc->ifc_name, unit);
|
|
|
|
gifattach0(sc);
|
|
|
|
mtx_lock(&gif_mtx);
|
|
LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list);
|
|
mtx_unlock(&gif_mtx);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
gifattach0(sc)
|
|
struct gif_softc *sc;
|
|
{
|
|
|
|
sc->encap_cookie4 = sc->encap_cookie6 = NULL;
|
|
|
|
sc->gif_if.if_addrlen = 0;
|
|
sc->gif_if.if_mtu = GIF_MTU;
|
|
sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
|
|
#if 0
|
|
/* turn off ingress filter */
|
|
sc->gif_if.if_flags |= IFF_LINK2;
|
|
#endif
|
|
sc->gif_if.if_ioctl = gif_ioctl;
|
|
sc->gif_if.if_output = gif_output;
|
|
sc->gif_if.if_type = IFT_GIF;
|
|
sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
|
|
if_attach(&sc->gif_if);
|
|
bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
|
|
if (ng_gif_attach_p != NULL)
|
|
(*ng_gif_attach_p)(&sc->gif_if);
|
|
}
|
|
|
|
static void
|
|
gif_destroy(struct gif_softc *sc)
|
|
{
|
|
struct ifnet *ifp = &sc->gif_if;
|
|
int err;
|
|
|
|
gif_delete_tunnel(ifp);
|
|
#ifdef INET6
|
|
if (sc->encap_cookie6 != NULL) {
|
|
err = encap_detach(sc->encap_cookie6);
|
|
KASSERT(err == 0, ("Unexpected error detaching encap_cookie6"));
|
|
}
|
|
#endif
|
|
#ifdef INET
|
|
if (sc->encap_cookie4 != NULL) {
|
|
err = encap_detach(sc->encap_cookie4);
|
|
KASSERT(err == 0, ("Unexpected error detaching encap_cookie4"));
|
|
}
|
|
#endif
|
|
|
|
if (ng_gif_detach_p != NULL)
|
|
(*ng_gif_detach_p)(ifp);
|
|
bpfdetach(ifp);
|
|
if_detach(ifp);
|
|
|
|
free(sc, M_GIF);
|
|
}
|
|
|
|
void
|
|
gif_clone_destroy(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct gif_softc *sc = ifp->if_softc;
|
|
|
|
mtx_lock(&gif_mtx);
|
|
LIST_REMOVE(sc, gif_list);
|
|
mtx_unlock(&gif_mtx);
|
|
gif_destroy(sc);
|
|
}
|
|
|
|
static int
|
|
gifmodevent(mod, type, data)
|
|
module_t mod;
|
|
int type;
|
|
void *data;
|
|
{
|
|
struct gif_softc *sc;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
mtx_init(&gif_mtx, "gif_mtx", NULL, MTX_DEF);
|
|
LIST_INIT(&gif_softc_list);
|
|
if_clone_attach(&gif_cloner);
|
|
|
|
#ifdef INET6
|
|
ip6_gif_hlim = GIF_HLIM;
|
|
#endif
|
|
|
|
break;
|
|
case MOD_UNLOAD:
|
|
if_clone_detach(&gif_cloner);
|
|
|
|
mtx_lock(&gif_mtx);
|
|
while ((sc = LIST_FIRST(&gif_softc_list)) != NULL) {
|
|
LIST_REMOVE(sc, gif_list);
|
|
mtx_unlock(&gif_mtx);
|
|
gif_destroy(sc);
|
|
mtx_lock(&gif_mtx);
|
|
}
|
|
mtx_unlock(&gif_mtx);
|
|
mtx_destroy(&gif_mtx);
|
|
#ifdef INET6
|
|
ip6_gif_hlim = 0;
|
|
#endif
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static moduledata_t gif_mod = {
|
|
"if_gif",
|
|
gifmodevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
|
|
MODULE_VERSION(if_gif, 1);
|
|
|
|
int
|
|
gif_encapcheck(m, off, proto, arg)
|
|
const struct mbuf *m;
|
|
int off;
|
|
int proto;
|
|
void *arg;
|
|
{
|
|
struct ip ip;
|
|
struct gif_softc *sc;
|
|
|
|
sc = (struct gif_softc *)arg;
|
|
if (sc == NULL)
|
|
return 0;
|
|
|
|
if ((sc->gif_if.if_flags & IFF_UP) == 0)
|
|
return 0;
|
|
|
|
/* no physical address */
|
|
if (!sc->gif_psrc || !sc->gif_pdst)
|
|
return 0;
|
|
|
|
switch (proto) {
|
|
#ifdef INET
|
|
case IPPROTO_IPV4:
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case IPPROTO_IPV6:
|
|
break;
|
|
#endif
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
/* Bail on short packets */
|
|
if (m->m_pkthdr.len < sizeof(ip))
|
|
return 0;
|
|
|
|
m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
|
|
|
|
switch (ip.ip_v) {
|
|
#ifdef INET
|
|
case 4:
|
|
if (sc->gif_psrc->sa_family != AF_INET ||
|
|
sc->gif_pdst->sa_family != AF_INET)
|
|
return 0;
|
|
return gif_encapcheck4(m, off, proto, arg);
|
|
#endif
|
|
#ifdef INET6
|
|
case 6:
|
|
if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
|
|
return 0;
|
|
if (sc->gif_psrc->sa_family != AF_INET6 ||
|
|
sc->gif_pdst->sa_family != AF_INET6)
|
|
return 0;
|
|
return gif_encapcheck6(m, off, proto, arg);
|
|
#endif
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int
|
|
gif_output(ifp, m, dst, rt)
|
|
struct ifnet *ifp;
|
|
struct mbuf *m;
|
|
struct sockaddr *dst;
|
|
struct rtentry *rt; /* added in net2 */
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc*)ifp;
|
|
int error = 0;
|
|
|
|
#ifdef MAC
|
|
error = mac_check_ifnet_transmit(ifp, m);
|
|
if (error) {
|
|
m_freem(m);
|
|
goto end;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* gif may cause infinite recursion calls when misconfigured.
|
|
* We'll prevent this by introducing upper limit.
|
|
* XXX: this mechanism may introduce another problem about
|
|
* mutual exclusion of the variable CALLED, especially if we
|
|
* use kernel thread.
|
|
*/
|
|
mtx_lock(&gif_mtx);
|
|
if (++gif_called > max_gif_nesting) {
|
|
mtx_unlock(&gif_mtx);
|
|
log(LOG_NOTICE,
|
|
"gif_output: recursively called too many times(%d)\n",
|
|
gif_called);
|
|
m_freem(m);
|
|
error = EIO; /* is there better errno? */
|
|
goto end;
|
|
}
|
|
mtx_unlock(&gif_mtx);
|
|
|
|
m->m_flags &= ~(M_BCAST|M_MCAST);
|
|
if (!(ifp->if_flags & IFF_UP) ||
|
|
sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
goto end;
|
|
}
|
|
|
|
if (ifp->if_bpf) {
|
|
u_int32_t af = dst->sa_family;
|
|
bpf_mtap2(ifp->if_bpf, &af, sizeof(af), m);
|
|
}
|
|
ifp->if_opackets++;
|
|
ifp->if_obytes += m->m_pkthdr.len;
|
|
|
|
/* inner AF-specific encapsulation */
|
|
|
|
/* XXX should we check if our outer source is legal? */
|
|
|
|
/* dispatch to output logic based on outer AF */
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
error = in_gif_output(ifp, dst->sa_family, m);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
error = in6_gif_output(ifp, dst->sa_family, m);
|
|
break;
|
|
#endif
|
|
default:
|
|
m_freem(m);
|
|
error = ENETDOWN;
|
|
goto end;
|
|
}
|
|
|
|
end:
|
|
mtx_lock(&gif_mtx);
|
|
gif_called = 0; /* reset recursion counter */
|
|
mtx_unlock(&gif_mtx);
|
|
if (error)
|
|
ifp->if_oerrors++;
|
|
return error;
|
|
}
|
|
|
|
void
|
|
gif_input(m, af, ifp)
|
|
struct mbuf *m;
|
|
int af;
|
|
struct ifnet *ifp;
|
|
{
|
|
int isr;
|
|
|
|
if (ifp == NULL) {
|
|
/* just in case */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
m->m_pkthdr.rcvif = ifp;
|
|
|
|
#ifdef MAC
|
|
mac_create_mbuf_from_ifnet(ifp, m);
|
|
#endif
|
|
|
|
if (ifp->if_bpf) {
|
|
u_int32_t af1 = af;
|
|
bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
|
|
}
|
|
|
|
if (ng_gif_input_p != NULL) {
|
|
(*ng_gif_input_p)(ifp, &m, af);
|
|
if (m == NULL)
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Put the packet to the network layer input queue according to the
|
|
* specified address family.
|
|
* Note: older versions of gif_input directly called network layer
|
|
* input functions, e.g. ip6_input, here. We changed the policy to
|
|
* prevent too many recursive calls of such input functions, which
|
|
* might cause kernel panic. But the change may introduce another
|
|
* problem; if the input queue is full, packets are discarded.
|
|
* The kernel stack overflow really happened, and we believed
|
|
* queue-full rarely occurs, so we changed the policy.
|
|
*/
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
isr = NETISR_IP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
if (ng_gif_input_orphan_p != NULL)
|
|
(*ng_gif_input_orphan_p)(ifp, m, af);
|
|
else
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
ifp->if_ipackets++;
|
|
ifp->if_ibytes += m->m_pkthdr.len;
|
|
netisr_dispatch(isr, m);
|
|
}
|
|
|
|
/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
|
|
int
|
|
gif_ioctl(ifp, cmd, data)
|
|
struct ifnet *ifp;
|
|
u_long cmd;
|
|
caddr_t data;
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc*)ifp;
|
|
struct ifreq *ifr = (struct ifreq*)data;
|
|
int error = 0, size;
|
|
struct sockaddr *dst, *src;
|
|
#ifdef SIOCSIFMTU /* xxx */
|
|
u_long mtu;
|
|
#endif
|
|
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
ifp->if_flags |= IFF_UP;
|
|
break;
|
|
|
|
case SIOCSIFDSTADDR:
|
|
break;
|
|
|
|
case SIOCADDMULTI:
|
|
case SIOCDELMULTI:
|
|
break;
|
|
|
|
#ifdef SIOCSIFMTU /* xxx */
|
|
case SIOCGIFMTU:
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
mtu = ifr->ifr_mtu;
|
|
if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX)
|
|
return (EINVAL);
|
|
ifp->if_mtu = mtu;
|
|
break;
|
|
#endif /* SIOCSIFMTU */
|
|
|
|
#ifdef INET
|
|
case SIOCSIFPHYADDR:
|
|
#endif
|
|
#ifdef INET6
|
|
case SIOCSIFPHYADDR_IN6:
|
|
#endif /* INET6 */
|
|
case SIOCSLIFPHYADDR:
|
|
switch (cmd) {
|
|
#ifdef INET
|
|
case SIOCSIFPHYADDR:
|
|
src = (struct sockaddr *)
|
|
&(((struct in_aliasreq *)data)->ifra_addr);
|
|
dst = (struct sockaddr *)
|
|
&(((struct in_aliasreq *)data)->ifra_dstaddr);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case SIOCSIFPHYADDR_IN6:
|
|
src = (struct sockaddr *)
|
|
&(((struct in6_aliasreq *)data)->ifra_addr);
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_aliasreq *)data)->ifra_dstaddr);
|
|
break;
|
|
#endif
|
|
case SIOCSLIFPHYADDR:
|
|
src = (struct sockaddr *)
|
|
&(((struct if_laddrreq *)data)->addr);
|
|
dst = (struct sockaddr *)
|
|
&(((struct if_laddrreq *)data)->dstaddr);
|
|
break;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
|
|
/* 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))
|
|
return EINVAL;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (src->sa_len != sizeof(struct sockaddr_in6))
|
|
return EINVAL;
|
|
break;
|
|
#endif
|
|
default:
|
|
return EAFNOSUPPORT;
|
|
}
|
|
switch (dst->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if (dst->sa_len != sizeof(struct sockaddr_in))
|
|
return EINVAL;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (dst->sa_len != sizeof(struct sockaddr_in6))
|
|
return EINVAL;
|
|
break;
|
|
#endif
|
|
default:
|
|
return EAFNOSUPPORT;
|
|
}
|
|
|
|
/* check sa_family looks sane for the cmd */
|
|
switch (cmd) {
|
|
case SIOCSIFPHYADDR:
|
|
if (src->sa_family == AF_INET)
|
|
break;
|
|
return EAFNOSUPPORT;
|
|
#ifdef INET6
|
|
case SIOCSIFPHYADDR_IN6:
|
|
if (src->sa_family == AF_INET6)
|
|
break;
|
|
return EAFNOSUPPORT;
|
|
#endif /* INET6 */
|
|
case SIOCSLIFPHYADDR:
|
|
/* checks done in the above */
|
|
break;
|
|
}
|
|
|
|
error = gif_set_tunnel(&sc->gif_if, src, dst);
|
|
break;
|
|
|
|
#ifdef SIOCDIFPHYADDR
|
|
case SIOCDIFPHYADDR:
|
|
gif_delete_tunnel(&sc->gif_if);
|
|
break;
|
|
#endif
|
|
|
|
case SIOCGIFPSRCADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_psrc == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_psrc;
|
|
switch (cmd) {
|
|
#ifdef INET
|
|
case SIOCGIFPSRCADDR:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(ifr->ifr_addr);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case SIOCGIFPSRCADDR_IN6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
if (src->sa_len > size)
|
|
return EINVAL;
|
|
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
|
|
break;
|
|
|
|
case SIOCGIFPDSTADDR:
|
|
#ifdef INET6
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
#endif /* INET6 */
|
|
if (sc->gif_pdst == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
src = sc->gif_pdst;
|
|
switch (cmd) {
|
|
#ifdef INET
|
|
case SIOCGIFPDSTADDR:
|
|
dst = &ifr->ifr_addr;
|
|
size = sizeof(ifr->ifr_addr);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case SIOCGIFPDSTADDR_IN6:
|
|
dst = (struct sockaddr *)
|
|
&(((struct in6_ifreq *)data)->ifr_addr);
|
|
size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
if (src->sa_len > size)
|
|
return EINVAL;
|
|
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
|
|
break;
|
|
|
|
case SIOCGLIFPHYADDR:
|
|
if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
|
|
error = EADDRNOTAVAIL;
|
|
goto bad;
|
|
}
|
|
|
|
/* copy src */
|
|
src = sc->gif_psrc;
|
|
dst = (struct sockaddr *)
|
|
&(((struct if_laddrreq *)data)->addr);
|
|
size = sizeof(((struct if_laddrreq *)data)->addr);
|
|
if (src->sa_len > size)
|
|
return EINVAL;
|
|
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
|
|
|
|
/* copy dst */
|
|
src = sc->gif_pdst;
|
|
dst = (struct sockaddr *)
|
|
&(((struct if_laddrreq *)data)->dstaddr);
|
|
size = sizeof(((struct if_laddrreq *)data)->dstaddr);
|
|
if (src->sa_len > size)
|
|
return EINVAL;
|
|
bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
|
|
break;
|
|
|
|
case SIOCSIFFLAGS:
|
|
/* if_ioctl() takes care of it */
|
|
break;
|
|
|
|
default:
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
bad:
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* XXXRW: There's a general event-ordering issue here: the code to check
|
|
* if a given tunnel is already present happens before we perform a
|
|
* potentially blocking setup of the tunnel. This code needs to be
|
|
* re-ordered so that the check and replacement can be atomic using
|
|
* a mutex.
|
|
*/
|
|
int
|
|
gif_set_tunnel(ifp, src, dst)
|
|
struct ifnet *ifp;
|
|
struct sockaddr *src;
|
|
struct sockaddr *dst;
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc *)ifp;
|
|
struct gif_softc *sc2;
|
|
struct sockaddr *osrc, *odst, *sa;
|
|
int s;
|
|
int error = 0;
|
|
|
|
s = splnet();
|
|
|
|
mtx_lock(&gif_mtx);
|
|
LIST_FOREACH(sc2, &gif_softc_list, gif_list) {
|
|
if (sc2 == sc)
|
|
continue;
|
|
if (!sc2->gif_pdst || !sc2->gif_psrc)
|
|
continue;
|
|
if (sc2->gif_pdst->sa_family != dst->sa_family ||
|
|
sc2->gif_pdst->sa_len != dst->sa_len ||
|
|
sc2->gif_psrc->sa_family != src->sa_family ||
|
|
sc2->gif_psrc->sa_len != src->sa_len)
|
|
continue;
|
|
|
|
/*
|
|
* Disallow parallel tunnels unless instructed
|
|
* otherwise.
|
|
*/
|
|
if (!parallel_tunnels &&
|
|
bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
|
|
bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
|
|
error = EADDRNOTAVAIL;
|
|
mtx_unlock(&gif_mtx);
|
|
goto bad;
|
|
}
|
|
|
|
/* XXX both end must be valid? (I mean, not 0.0.0.0) */
|
|
}
|
|
mtx_unlock(&gif_mtx);
|
|
|
|
/* XXX we can detach from both, but be polite just in case */
|
|
if (sc->gif_psrc)
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
(void)in_gif_detach(sc);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
(void)in6_gif_detach(sc);
|
|
break;
|
|
#endif
|
|
}
|
|
|
|
osrc = sc->gif_psrc;
|
|
sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
|
|
bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
|
|
sc->gif_psrc = sa;
|
|
|
|
odst = sc->gif_pdst;
|
|
sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
|
|
bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
|
|
sc->gif_pdst = sa;
|
|
|
|
switch (sc->gif_psrc->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
error = in_gif_attach(sc);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
error = in6_gif_attach(sc);
|
|
break;
|
|
#endif
|
|
}
|
|
if (error) {
|
|
/* rollback */
|
|
free((caddr_t)sc->gif_psrc, M_IFADDR);
|
|
free((caddr_t)sc->gif_pdst, M_IFADDR);
|
|
sc->gif_psrc = osrc;
|
|
sc->gif_pdst = odst;
|
|
goto bad;
|
|
}
|
|
|
|
if (osrc)
|
|
free((caddr_t)osrc, M_IFADDR);
|
|
if (odst)
|
|
free((caddr_t)odst, M_IFADDR);
|
|
|
|
if (sc->gif_psrc && sc->gif_pdst)
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
else
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
splx(s);
|
|
|
|
return 0;
|
|
|
|
bad:
|
|
if (sc->gif_psrc && sc->gif_pdst)
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
else
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
splx(s);
|
|
|
|
return error;
|
|
}
|
|
|
|
void
|
|
gif_delete_tunnel(ifp)
|
|
struct ifnet *ifp;
|
|
{
|
|
struct gif_softc *sc = (struct gif_softc *)ifp;
|
|
int s;
|
|
|
|
s = splnet();
|
|
|
|
if (sc->gif_psrc) {
|
|
free((caddr_t)sc->gif_psrc, M_IFADDR);
|
|
sc->gif_psrc = NULL;
|
|
}
|
|
if (sc->gif_pdst) {
|
|
free((caddr_t)sc->gif_pdst, M_IFADDR);
|
|
sc->gif_pdst = NULL;
|
|
}
|
|
/* it is safe to detach from both */
|
|
#ifdef INET
|
|
(void)in_gif_detach(sc);
|
|
#endif
|
|
#ifdef INET6
|
|
(void)in6_gif_detach(sc);
|
|
#endif
|
|
|
|
if (sc->gif_psrc && sc->gif_pdst)
|
|
ifp->if_flags |= IFF_RUNNING;
|
|
else
|
|
ifp->if_flags &= ~IFF_RUNNING;
|
|
splx(s);
|
|
}
|