/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
* Copyright (c) 1980, 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.c 8.5 (Berkeley) 1/9/95
*/
#include <sys/param.h>
#include <sys/eventhandler.h>
#include <sys/malloc.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_private.h>
#include <net/if_clone.h>
#include <net/radix.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netlink/netlink.h>
#include <netlink/netlink_ctl.h>
#include <netlink/netlink_route.h>
#include <netlink/route/route_var.h>
/* Current IF_MAXUNIT expands maximum to 5 characters. */
#define IFCLOSIZ (IFNAMSIZ - 5)
/*
* Structure describing a `cloning' interface.
*
* List of locks
* (c) const until freeing
* (d) driver specific data, may need external protection.
* (e) locked by if_cloners_mtx
* (i) locked by ifc_mtx mtx
*/
struct if_clone {
char ifc_name[IFCLOSIZ]; /* (c) Name of device, e.g. `gif' */
struct unrhdr *ifc_unrhdr; /* (c) alloc_unr(9) header */
int ifc_maxunit; /* (c) maximum unit number */
int ifc_flags;
long ifc_refcnt; /* (i) Reference count. */
LIST_HEAD(, ifnet) ifc_iflist; /* (i) List of cloned interfaces */
struct mtx ifc_mtx; /* Mutex to protect members. */
ifc_match_f *ifc_match; /* (c) Matcher function */
ifc_create_f *ifc_create; /* (c) Creates new interface */
ifc_destroy_f *ifc_destroy; /* (c) Destroys cloned interface */
ifc_create_nl_f *create_nl; /* (c) Netlink creation handler */
ifc_modify_nl_f *modify_nl; /* (c) Netlink modification handler */
ifc_dump_nl_f *dump_nl; /* (c) Netlink dump handler */
#ifdef CLONE_COMPAT_13
/* (c) Driver specific cloning functions. Called with no locks held. */
union {
struct { /* advanced cloner */
ifc_create_t *_ifc_create;
ifc_destroy_t *_ifc_destroy;
} A;
struct { /* simple cloner */
ifcs_create_t *_ifcs_create;
ifcs_destroy_t *_ifcs_destroy;
int _ifcs_minifs; /* minimum ifs */
} S;
} U;
#define ifca_create U.A._ifc_create
#define ifca_destroy U.A._ifc_destroy
#define ifcs_create U.S._ifcs_create
#define ifcs_destroy U.S._ifcs_destroy
#define ifcs_minifs U.S._ifcs_minifs
#endif
LIST_ENTRY(if_clone) ifc_list; /* (e) On list of cloners */
};
static void if_clone_free(struct if_clone *ifc);
static int if_clone_createif_nl(struct if_clone *ifc, const char *name,
struct ifc_data_nl *ifd);
static int ifc_simple_match(struct if_clone *ifc, const char *name);
static int ifc_handle_unit(struct if_clone *ifc, char *name, size_t len, int *punit);
static struct if_clone *ifc_find_cloner(const char *name);
static struct if_clone *ifc_find_cloner_match(const char *name);
#ifdef CLONE_COMPAT_13
static int ifc_simple_create_wrapper(struct if_clone *ifc, char *name, size_t maxlen,
struct ifc_data *ifc_data, struct ifnet **ifpp);
static int ifc_advanced_create_wrapper(struct if_clone *ifc, char *name, size_t maxlen,
struct ifc_data *ifc_data, struct ifnet **ifpp);
#endif
static struct mtx if_cloners_mtx;
MTX_SYSINIT(if_cloners_lock, &if_cloners_mtx, "if_cloners lock", MTX_DEF);
VNET_DEFINE_STATIC(int, if_cloners_count);
VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners);
#define V_if_cloners_count VNET(if_cloners_count)
#define V_if_cloners VNET(if_cloners)
#define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED)
#define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx)
#define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx)
#define IF_CLONE_LOCK_INIT(ifc) \
mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF)
#define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx)
#define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED)
#define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx)
#define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx)
#define IF_CLONE_ADDREF(ifc) \
do { \
IF_CLONE_LOCK(ifc); \
IF_CLONE_ADDREF_LOCKED(ifc); \
IF_CLONE_UNLOCK(ifc); \
} while (0)
#define IF_CLONE_ADDREF_LOCKED(ifc) \
do { \
IF_CLONE_LOCK_ASSERT(ifc); \
KASSERT((ifc)->ifc_refcnt >= 0, \
("negative refcnt %ld", (ifc)->ifc_refcnt)); \
(ifc)->ifc_refcnt++; \
} while (0)
#define IF_CLONE_REMREF(ifc) \
do { \
IF_CLONE_LOCK(ifc); \
IF_CLONE_REMREF_LOCKED(ifc); \
} while (0)
#define IF_CLONE_REMREF_LOCKED(ifc) \
do { \
IF_CLONE_LOCK_ASSERT(ifc); \
KASSERT((ifc)->ifc_refcnt > 0, \
("bogus refcnt %ld", (ifc)->ifc_refcnt)); \
if (--(ifc)->ifc_refcnt == 0) { \
IF_CLONE_UNLOCK(ifc); \
if_clone_free(ifc); \
} else { \
/* silently free the lock */ \
IF_CLONE_UNLOCK(ifc); \
} \
} while (0)
#define IFC_IFLIST_INSERT(_ifc, _ifp) \
LIST_INSERT_HEAD(&_ifc->ifc_iflist, _ifp, if_clones)
#define IFC_IFLIST_REMOVE(_ifc, _ifp) \
LIST_REMOVE(_ifp, if_clones)
static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
void
vnet_if_clone_init(void)
{
LIST_INIT(&V_if_cloners);
}
/*
* Lookup and create a clone network interface.
*/
int
ifc_create_ifp(const char *name, struct ifc_data *ifd, struct ifnet **ifpp)
{
struct if_clone *ifc = ifc_find_cloner_match(name);
if (ifc == NULL)
return (EINVAL);
struct ifc_data_nl ifd_new = {
.flags = ifd->flags,
.unit = ifd->unit,
.params = ifd->params,
};
int error = if_clone_createif_nl(ifc, name, &ifd_new);
if (ifpp != NULL)
*ifpp = ifd_new.ifp;
return (error);
}
bool
ifc_create_ifp_nl(const char *name, struct ifc_data_nl *ifd)
{
struct if_clone *ifc = ifc_find_cloner_match(name);
if (ifc == NULL) {
ifd->error = EINVAL;
return (false);
}
ifd->error = if_clone_createif_nl(ifc, name, ifd);
return (true);
}
int
if_clone_create(char *name, size_t len, caddr_t params)
{
struct ifc_data ifd = { .params = params };
struct ifnet *ifp;
int error = ifc_create_ifp(name, &ifd, &ifp);
if (error == 0)
strlcpy(name, if_name(ifp), len);
return (error);
}
bool
ifc_modify_ifp_nl(struct ifnet *ifp, struct ifc_data_nl *ifd)
{
struct if_clone *ifc = ifc_find_cloner(ifp->if_dname);
if (ifc == NULL) {
ifd->error = EINVAL;
return (false);
}
ifd->error = (*ifc->modify_nl)(ifp, ifd);
return (true);
}
bool
ifc_dump_ifp_nl(struct ifnet *ifp, struct nl_writer *nw)
{
struct if_clone *ifc = ifc_find_cloner(ifp->if_dname);
if (ifc == NULL)
return (false);
(*ifc->dump_nl)(ifp, nw);
return (true);
}
static int
ifc_create_ifp_nl_default(struct if_clone *ifc, char *name, size_t len,
struct ifc_data_nl *ifd)
{
struct ifc_data ifd_new = {
.flags = ifd->flags,
.unit = ifd->unit,
.params = ifd->params,
};
return ((*ifc->ifc_create)(ifc, name, len, &ifd_new, &ifd->ifp));
}
static int
ifc_modify_ifp_nl_default(struct ifnet *ifp, struct ifc_data_nl *ifd)
{
if (ifd->lattrs != NULL)
return (nl_modify_ifp_generic(ifp, ifd->lattrs, ifd->bm, ifd->npt));
return (0);
}
static void
ifc_dump_ifp_nl_default(struct ifnet *ifp, struct nl_writer *nw)
{
int off = nlattr_add_nested(nw, IFLA_LINKINFO);
if (off != 0) {
nlattr_add_string(nw, IFLA_INFO_KIND, ifp->if_dname);
nlattr_set_len(nw, off);
}
}
void
ifc_link_ifp(struct if_clone *ifc, struct ifnet *ifp)
{
if_addgroup(ifp, ifc->ifc_name);
IF_CLONE_LOCK(ifc);
IFC_IFLIST_INSERT(ifc, ifp);
IF_CLONE_UNLOCK(ifc);
}
void
if_clone_addif(struct if_clone *ifc, struct ifnet *ifp)
{
ifc_link_ifp(ifc, ifp);
}
bool
ifc_unlink_ifp(struct if_clone *ifc, struct ifnet *ifp)
{
struct ifnet *ifcifp;
IF_CLONE_LOCK(ifc);
LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
if (ifcifp == ifp) {
IFC_IFLIST_REMOVE(ifc, ifp);
break;
}
}
IF_CLONE_UNLOCK(ifc);
if (ifcifp != NULL)
if_delgroup(ifp, ifc->ifc_name);
return (ifcifp != NULL);
}
static struct if_clone *
ifc_find_cloner_match(const char *name)
{
struct if_clone *ifc;
IF_CLONERS_LOCK();
LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
if (ifc->ifc_match(ifc, name))
break;
}
IF_CLONERS_UNLOCK();
return (ifc);
}
static struct if_clone *
ifc_find_cloner(const char *name)
{
struct if_clone *ifc;
IF_CLONERS_LOCK();
LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
if (strcmp(ifc->ifc_name, name) == 0) {
break;
}
}
IF_CLONERS_UNLOCK();
return (ifc);
}
static struct if_clone *
ifc_find_cloner_in_vnet(const char *name, struct vnet *vnet)
{
CURVNET_SET_QUIET(vnet);
struct if_clone *ifc = ifc_find_cloner(name);
CURVNET_RESTORE();
return (ifc);
}
/*
* Create a clone network interface.
*/
static int
if_clone_createif_nl(struct if_clone *ifc, const char *ifname, struct ifc_data_nl *ifd)
{
char name[IFNAMSIZ];
int error;
strlcpy(name, ifname, sizeof(name));
if (ifunit(name) != NULL)
return (EEXIST);
if (ifc->ifc_flags & IFC_F_AUTOUNIT) {
if ((error = ifc_handle_unit(ifc, name, sizeof(name), &ifd->unit)) != 0)
return (error);
}
if (ifd->lattrs != NULL)
error = (*ifc->create_nl)(ifc, name, sizeof(name), ifd);
else
error = ifc_create_ifp_nl_default(ifc, name, sizeof(name), ifd);
if (error != 0) {
if (ifc->ifc_flags & IFC_F_AUTOUNIT)
ifc_free_unit(ifc, ifd->unit);
return (error);
}
MPASS(ifd->ifp != NULL);
if_clone_addif(ifc, ifd->ifp);
if (ifd->lattrs != NULL)
error = (*ifc->modify_nl)(ifd->ifp, ifd);
return (error);
}
/*
* Lookup and destroy a clone network interface.
*/
int
if_clone_destroy(const char *name)
{
int err;
struct if_clone *ifc;
struct ifnet *ifp;
ifp = ifunit_ref(name);
if (ifp == NULL)
return (ENXIO);
ifc = ifc_find_cloner_in_vnet(ifp->if_dname, ifp->if_home_vnet);
if (ifc == NULL) {
if_rele(ifp);
return (EINVAL);
}
err = if_clone_destroyif(ifc, ifp);
if_rele(ifp);
return err;
}
/*
* Destroy a clone network interface.
*/
static int
if_clone_destroyif_flags(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
{
int err;
/*
* Given that the cloned ifnet might be attached to a different
* vnet from where its cloner was registered, we have to
* switch to the vnet context of the target vnet.
*/
CURVNET_SET_QUIET(ifp->if_vnet);
if (!ifc_unlink_ifp(ifc, ifp)) {
CURVNET_RESTORE();
return (ENXIO); /* ifp is not on the list. */
}
int unit = ifp->if_dunit;
err = (*ifc->ifc_destroy)(ifc, ifp, flags);
if (err != 0)
ifc_link_ifp(ifc, ifp);
else if (ifc->ifc_flags & IFC_F_AUTOUNIT)
ifc_free_unit(ifc, unit);
CURVNET_RESTORE();
return (err);
}
int
if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
{
return (if_clone_destroyif_flags(ifc, ifp, 0));
}
static struct if_clone *
if_clone_alloc(const char *name, int maxunit)
{
struct if_clone *ifc;
KASSERT(name != NULL, ("%s: no name\n", __func__));
ifc = malloc(sizeof(struct if_clone), M_CLONE, M_WAITOK | M_ZERO);
strncpy(ifc->ifc_name, name, IFCLOSIZ-1);
IF_CLONE_LOCK_INIT(ifc);
IF_CLONE_ADDREF(ifc);
ifc->ifc_maxunit = maxunit ? maxunit : IF_MAXUNIT;
ifc->ifc_unrhdr = new_unrhdr(0, ifc->ifc_maxunit, &ifc->ifc_mtx);
LIST_INIT(&ifc->ifc_iflist);
ifc->create_nl = ifc_create_ifp_nl_default;
ifc->modify_nl = ifc_modify_ifp_nl_default;
ifc->dump_nl = ifc_dump_ifp_nl_default;
return (ifc);
}
static int
if_clone_attach(struct if_clone *ifc)
{
struct if_clone *ifc1;
IF_CLONERS_LOCK();
LIST_FOREACH(ifc1, &V_if_cloners, ifc_list)
if (strcmp(ifc->ifc_name, ifc1->ifc_name) == 0) {
IF_CLONERS_UNLOCK();
IF_CLONE_REMREF(ifc);
return (EEXIST);
}
LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list);
V_if_cloners_count++;
IF_CLONERS_UNLOCK();
return (0);
}
struct if_clone *
ifc_attach_cloner(const char *name, struct if_clone_addreq *req)
{
if (req->create_f == NULL || req->destroy_f == NULL)
return (NULL);
if (strnlen(name, IFCLOSIZ) >= (IFCLOSIZ - 1))
return (NULL);
struct if_clone *ifc = if_clone_alloc(name, req->maxunit);
ifc->ifc_match = req->match_f != NULL ? req->match_f : ifc_simple_match;
ifc->ifc_create = req->create_f;
ifc->ifc_destroy = req->destroy_f;
ifc->ifc_flags = (req->flags & IFC_F_AUTOUNIT);
if (req->version == 2) {
struct if_clone_addreq_v2 *req2 = (struct if_clone_addreq_v2 *)req;
ifc->create_nl = req2->create_nl_f;
ifc->modify_nl = req2->modify_nl_f;
ifc->dump_nl = req2->dump_nl_f;
}
ifc->dump_nl = ifc_dump_ifp_nl_default;
if (if_clone_attach(ifc) != 0)
return (NULL);
EVENTHANDLER_INVOKE(if_clone_event, ifc);
return (ifc);
}
void
ifc_detach_cloner(struct if_clone *ifc)
{
if_clone_detach(ifc);
}
#ifdef CLONE_COMPAT_13
static int
ifc_advanced_create_wrapper(struct if_clone *ifc, char *name, size_t maxlen,
struct ifc_data *ifc_data, struct ifnet **ifpp)
{
int error = ifc->ifca_create(ifc, name, maxlen, ifc_data->params);
if (error == 0)
*ifpp = ifunit(name);
return (error);
}
static int
ifc_advanced_destroy_wrapper(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
{
if (ifc->ifca_destroy == NULL)
return (ENOTSUP);
return (ifc->ifca_destroy(ifc, ifp));
}
struct if_clone *
if_clone_advanced(const char *name, u_int maxunit, ifc_match_t match,
ifc_create_t create, ifc_destroy_t destroy)
{
struct if_clone *ifc;
ifc = if_clone_alloc(name, maxunit);
ifc->ifc_match = match;
ifc->ifc_create = ifc_advanced_create_wrapper;
ifc->ifc_destroy = ifc_advanced_destroy_wrapper;
ifc->ifca_destroy = destroy;
ifc->ifca_create = create;
if (if_clone_attach(ifc) != 0)
return (NULL);
EVENTHANDLER_INVOKE(if_clone_event, ifc);
return (ifc);
}
static int
ifc_simple_create_wrapper(struct if_clone *ifc, char *name, size_t maxlen,
struct ifc_data *ifc_data, struct ifnet **ifpp)
{
int unit = 0;
ifc_name2unit(name, &unit);
int error = ifc->ifcs_create(ifc, unit, ifc_data->params);
if (error == 0)
*ifpp = ifunit(name);
return (error);
}
static int
ifc_simple_destroy_wrapper(struct if_clone *ifc, struct ifnet *ifp, uint32_t flags)
{
if (ifp->if_dunit < ifc->ifcs_minifs && (flags & IFC_F_FORCE) == 0)
return (EINVAL);
ifc->ifcs_destroy(ifp);
return (0);
}
struct if_clone *
if_clone_simple(const char *name, ifcs_create_t create, ifcs_destroy_t destroy,
u_int minifs)
{
struct if_clone *ifc;
u_int unit;
ifc = if_clone_alloc(name, 0);
ifc->ifc_match = ifc_simple_match;
ifc->ifc_create = ifc_simple_create_wrapper;
ifc->ifc_destroy = ifc_simple_destroy_wrapper;
ifc->ifcs_create = create;
ifc->ifcs_destroy = destroy;
ifc->ifcs_minifs = minifs;
ifc->ifc_flags = IFC_F_AUTOUNIT;
if (if_clone_attach(ifc) != 0)
return (NULL);
for (unit = 0; unit < minifs; unit++) {
char name[IFNAMSIZ];
int error __unused;
struct ifc_data_nl ifd = {};
snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
error = if_clone_createif_nl(ifc, name, &ifd);
KASSERT(error == 0,
("%s: failed to create required interface %s",
__func__, name));
}
EVENTHANDLER_INVOKE(if_clone_event, ifc);
return (ifc);
}
#endif
/*
* Unregister a network interface cloner.
*/
void
if_clone_detach(struct if_clone *ifc)
{
IF_CLONERS_LOCK();
LIST_REMOVE(ifc, ifc_list);
V_if_cloners_count--;
IF_CLONERS_UNLOCK();
/* destroy all interfaces for this cloner */
while (!LIST_EMPTY(&ifc->ifc_iflist))
if_clone_destroyif_flags(ifc, LIST_FIRST(&ifc->ifc_iflist), IFC_F_FORCE);
IF_CLONE_REMREF(ifc);
}
static void
if_clone_free(struct if_clone *ifc)
{
KASSERT(LIST_EMPTY(&ifc->ifc_iflist),
("%s: ifc_iflist not empty", __func__));
IF_CLONE_LOCK_DESTROY(ifc);
delete_unrhdr(ifc->ifc_unrhdr);
free(ifc, M_CLONE);
}
/*
* Provide list of interface cloners to userspace.
*/
int
if_clone_list(struct if_clonereq *ifcr)
{
char *buf, *dst, *outbuf = NULL;
struct if_clone *ifc;
int buf_count, count, err = 0;
if (ifcr->ifcr_count < 0)
return (EINVAL);
IF_CLONERS_LOCK();
/*
* Set our internal output buffer size. We could end up not
* reporting a cloner that is added between the unlock and lock
* below, but that's not a major problem. Not caping our
* allocation to the number of cloners actually in the system
* could be because that would let arbitrary users cause us to
* allocate arbitrary amounts of kernel memory.
*/
buf_count = (V_if_cloners_count < ifcr->ifcr_count) ?
V_if_cloners_count : ifcr->ifcr_count;
IF_CLONERS_UNLOCK();
outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
IF_CLONERS_LOCK();
ifcr->ifcr_total = V_if_cloners_count;
if ((dst = ifcr->ifcr_buffer) == NULL) {
/* Just asking how many there are. */
goto done;
}
count = (V_if_cloners_count < buf_count) ?
V_if_cloners_count : buf_count;
for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf;
ifc != NULL && count != 0;
ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
}
done:
IF_CLONERS_UNLOCK();
if (err == 0 && dst != NULL)
err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
if (outbuf != NULL)
free(outbuf, M_CLONE);
return (err);
}
#ifdef VIMAGE
/*
* if_clone_restoregroup() is used in context of if_vmove().
*
* Since if_detach_internal() has removed the interface from ALL groups, we
* need to "restore" interface membership in the cloner's group. Note that
* interface belongs to cloner in its home vnet, so we first find the original
* cloner, and then we confirm that cloner with the same name exists in the
* current vnet.
*/
void
if_clone_restoregroup(struct ifnet *ifp)
{
struct if_clone *ifc;
struct ifnet *ifcifp;
char ifc_name[IFCLOSIZ] = { [0] = '\0' };
CURVNET_SET_QUIET(ifp->if_home_vnet);
IF_CLONERS_LOCK();
LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
IF_CLONE_LOCK(ifc);
LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
if (ifp == ifcifp) {
strncpy(ifc_name, ifc->ifc_name, IFCLOSIZ-1);
break;
}
}
IF_CLONE_UNLOCK(ifc);
if (ifc_name[0] != '\0')
break;
}
CURVNET_RESTORE();
LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
if (strcmp(ifc->ifc_name, ifc_name) == 0)
break;
IF_CLONERS_UNLOCK();
if (ifc != NULL)
if_addgroup(ifp, ifc_name);
}
#endif
/*
* A utility function to extract unit numbers from interface names of
* the form name###.
*
* Returns 0 on success and an error on failure.
*/
int
ifc_name2unit(const char *name, int *unit)
{
const char *cp;
int cutoff = INT_MAX / 10;
int cutlim = INT_MAX % 10;
for (cp = name; *cp != '\0' && (*cp < '0' || *cp > '9'); cp++)
;
if (*cp == '\0') {
*unit = -1;
} else if (cp[0] == '0' && cp[1] != '\0') {
/* Disallow leading zeroes. */
return (EINVAL);
} else {
for (*unit = 0; *cp != '\0'; cp++) {
if (*cp < '0' || *cp > '9') {
/* Bogus unit number. */
return (EINVAL);
}
if (*unit > cutoff ||
(*unit == cutoff && *cp - '0' > cutlim))
return (EINVAL);
*unit = (*unit * 10) + (*cp - '0');
}
}
return (0);
}
static int
ifc_alloc_unit_specific(struct if_clone *ifc, int *unit)
{
char name[IFNAMSIZ];
if (*unit > ifc->ifc_maxunit)
return (ENOSPC);
if (alloc_unr_specific(ifc->ifc_unrhdr, *unit) == -1)
return (EEXIST);
snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, *unit);
if (ifunit(name) != NULL) {
free_unr(ifc->ifc_unrhdr, *unit);
return (EEXIST);
}
IF_CLONE_ADDREF(ifc);
return (0);
}
static int
ifc_alloc_unit_next(struct if_clone *ifc, int *unit)
{
int error;
*unit = alloc_unr(ifc->ifc_unrhdr);
if (*unit == -1)
return (ENOSPC);
free_unr(ifc->ifc_unrhdr, *unit);
for (;;) {
error = ifc_alloc_unit_specific(ifc, unit);
if (error != EEXIST)
break;
(*unit)++;
}
return (error);
}
int
ifc_alloc_unit(struct if_clone *ifc, int *unit)
{
if (*unit < 0)
return (ifc_alloc_unit_next(ifc, unit));
else
return (ifc_alloc_unit_specific(ifc, unit));
}
void
ifc_free_unit(struct if_clone *ifc, int unit)
{
free_unr(ifc->ifc_unrhdr, unit);
IF_CLONE_REMREF(ifc);
}
static int
ifc_simple_match(struct if_clone *ifc, const char *name)
{
const char *cp;
int i;
/* Match the name */
for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) {
if (ifc->ifc_name[i] != *cp)
return (0);
}
/* Make sure there's a unit number or nothing after the name */
for (; *cp != '\0'; cp++) {
if (*cp < '0' || *cp > '9')
return (0);
}
return (1);
}
static int
ifc_handle_unit(struct if_clone *ifc, char *name, size_t len, int *punit)
{
char *dp;
int wildcard;
int unit;
int err;
err = ifc_name2unit(name, &unit);
if (err != 0)
return (err);
wildcard = (unit < 0);
err = ifc_alloc_unit(ifc, &unit);
if (err != 0)
return (err);
/* In the wildcard case, we need to update the name. */
if (wildcard) {
for (dp = name; *dp != '\0'; dp++);
if (snprintf(dp, len - (dp-name), "%d", unit) >
len - (dp-name) - 1) {
/*
* This can only be a programmer error and
* there's no straightforward way to recover if
* it happens.
*/
panic("if_clone_create(): interface name too long");
}
}
*punit = unit;
return (0);
}
int
ifc_copyin(const struct ifc_data *ifd, void *target, size_t len)
{
if (ifd->params == NULL)
return (EINVAL);
if (ifd->flags & IFC_F_SYSSPACE) {
memcpy(target, ifd->params, len);
return (0);
} else
return (copyin(ifd->params, target, len));
}
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