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/*-
* Copyright (c) 2004-2009 University of Zagreb
* Copyright (c) 2006-2009 FreeBSD Foundation
*
* This software was developed by the University of Zagreb and the
* FreeBSD Foundation under sponsorship by the Stichting NLnet and the
* FreeBSD Foundation.
*
* 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.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sx.h>
#include <sys/vimage.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
#include <net/if.h>
#include <net/route.h>
#include <net/vnet.h>
MALLOC_DEFINE(M_VNET, "vnet", "network stack control block");
struct rwlock vnet_rwlock;
struct sx vnet_sxlock;
#define VNET_LIST_WLOCK() do { \
sx_xlock(&vnet_sxlock); \
rw_wlock(&vnet_rwlock); \
} while (0)
#define VNET_LIST_WUNLOCK() do { \
rw_wunlock(&vnet_rwlock); \
sx_xunlock(&vnet_sxlock); \
} while (0)
struct vnet_list_head vnet_head;
struct vnet *vnet0;
/*
* Move an ifnet to or from another vnet, specified by the jail id.
*/
int
vi_if_move(struct thread *td, struct ifnet *ifp, char *ifname, int jid)
{
struct ifnet *t_ifp;
struct prison *pr;
struct vnet *new_vnet;
int error;
sx_slock(&allprison_lock);
pr = prison_find_child(td->td_ucred->cr_prison, jid);
sx_sunlock(&allprison_lock);
if (pr == NULL)
return (ENXIO);
prison_hold_locked(pr);
mtx_unlock(&pr->pr_mtx);
if (ifp != NULL) {
/* SIOCSIFVNET */
new_vnet = pr->pr_vnet;
} else {
/* SIOCSIFRVNET */
new_vnet = TD_TO_VNET(td);
CURVNET_SET(pr->pr_vnet);
ifp = ifunit(ifname);
CURVNET_RESTORE();
if (ifp == NULL) {
prison_free(pr);
return (ENXIO);
}
}
error = 0;
if (new_vnet != ifp->if_vnet) {
/*
* Check for naming clashes in target vnet. Not locked so races
* are possible.
*/
CURVNET_SET_QUIET(new_vnet);
t_ifp = ifunit(ifname);
CURVNET_RESTORE();
if (t_ifp != NULL)
error = EEXIST;
else {
/* Detach from curvnet and attach to new_vnet. */
if_vmove(ifp, new_vnet);
/* Report the new if_xname back to the userland */
sprintf(ifname, "%s", ifp->if_xname);
}
}
prison_free(pr);
return (error);
}
struct vnet *
vnet_alloc(void)
{
struct vnet *vnet;
vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
vnet->vnet_magic_n = VNET_MAGIC_N;
vnet_data_init(vnet);
/* Initialize / attach vnet module instances. */
CURVNET_SET_QUIET(vnet);
sx_xlock(&vnet_sxlock);
vnet_sysinit();
CURVNET_RESTORE();
rw_wlock(&vnet_rwlock);
LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
VNET_LIST_WUNLOCK();
return (vnet);
}
void
vnet_destroy(struct vnet *vnet)
{
struct ifnet *ifp, *nifp;
KASSERT(vnet->vnet_sockcnt == 0,
("%s: vnet still has sockets", __func__));
VNET_LIST_WLOCK();
LIST_REMOVE(vnet, vnet_le);
rw_wunlock(&vnet_rwlock);
CURVNET_SET_QUIET(vnet);
/* Return all inherited interfaces to their parent vnets. */
TAILQ_FOREACH_SAFE(ifp, &V_ifnet, if_link, nifp) {
if (ifp->if_home_vnet != ifp->if_vnet)
if_vmove(ifp, ifp->if_home_vnet);
}
vnet_sysuninit();
sx_xunlock(&vnet_sxlock);
CURVNET_RESTORE();
/* Hopefully, we are OK to free the vnet container itself. */
vnet_data_destroy(vnet);
vnet->vnet_magic_n = 0xdeadbeef;
free(vnet, M_VNET);
}
void
vnet_foreach(void (*vnet_foreach_fn)(struct vnet *, void *), void *arg)
{
struct vnet *vnet;
VNET_LIST_RLOCK();
LIST_FOREACH(vnet, &vnet_head, vnet_le)
vnet_foreach_fn(vnet, arg);
VNET_LIST_RUNLOCK();
}
static void
vnet_init_prelink(void *arg)
{
rw_init(&vnet_rwlock, "vnet_rwlock");
sx_init(&vnet_sxlock, "vnet_sxlock");
LIST_INIT(&vnet_head);
}
SYSINIT(vnet_init_prelink, SI_SUB_VNET_PRELINK, SI_ORDER_FIRST,
vnet_init_prelink, NULL);
static void
vnet0_init(void *arg)
{
/*
* We MUST clear curvnet in vi_init_done() before going SMP,
* otherwise CURVNET_SET() macros would scream about unnecessary
* curvnet recursions.
*/
curvnet = prison0.pr_vnet = vnet0 = vnet_alloc();
}
SYSINIT(vnet0_init, SI_SUB_VNET, SI_ORDER_FIRST, vnet0_init, NULL);
static void
vnet_init_done(void *unused)
{
curvnet = NULL;
}
SYSINIT(vnet_init_done, SI_SUB_VNET_DONE, SI_ORDER_FIRST, vnet_init_done,
NULL);
#ifdef DDB
DB_SHOW_COMMAND(vnets, db_show_vnets)
{
VNET_ITERATOR_DECL(vnet_iter);
#if SIZE_MAX == UINT32_MAX /* 32-bit arch */
db_printf(" vnet ifs socks\n");
#else /* 64-bit arch, most probaly... */
db_printf(" vnet ifs socks\n");
#endif
VNET_FOREACH(vnet_iter) {
db_printf("%p %3d %5d\n", vnet_iter, vnet_iter->vnet_ifcnt,
vnet_iter->vnet_sockcnt);
}
}
#endif
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