c769e1be01
to remove it to avoid panics in case of two threads trying to remove it in parallel. PR: kern/116837 Submitted by: Takahiro Kurosawa (takahiro.kurosawa gmail.com) (orig version) MFC after: 10 days
611 lines
14 KiB
C
611 lines
14 KiB
C
/*-
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* Copyright (c) 1980, 1986, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)if.c 8.5 (Berkeley) 1/9/95
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/malloc.h>
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#include <sys/limits.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_clone.h>
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#if 0
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#include <net/if_dl.h>
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#endif
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <net/radix.h>
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#include <net/route.h>
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#include <net/vnet.h>
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static void if_clone_free(struct if_clone *ifc);
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static int if_clone_createif(struct if_clone *ifc, char *name, size_t len,
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caddr_t params);
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static struct mtx if_cloners_mtx;
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static VNET_DEFINE(int, if_cloners_count);
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VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners);
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#define V_if_cloners_count VNET(if_cloners_count)
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#define V_if_cloners VNET(if_cloners)
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#define IF_CLONERS_LOCK_INIT() \
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mtx_init(&if_cloners_mtx, "if_cloners lock", NULL, MTX_DEF)
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#define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED)
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#define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx)
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#define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx)
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#define IF_CLONE_LOCK_INIT(ifc) \
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mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF)
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#define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx)
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#define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED)
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#define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx)
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#define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx)
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#define IF_CLONE_ADDREF(ifc) \
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do { \
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IF_CLONE_LOCK(ifc); \
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IF_CLONE_ADDREF_LOCKED(ifc); \
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IF_CLONE_UNLOCK(ifc); \
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} while (0)
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#define IF_CLONE_ADDREF_LOCKED(ifc) \
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do { \
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IF_CLONE_LOCK_ASSERT(ifc); \
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KASSERT((ifc)->ifc_refcnt >= 0, \
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("negative refcnt %ld", (ifc)->ifc_refcnt)); \
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(ifc)->ifc_refcnt++; \
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} while (0)
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#define IF_CLONE_REMREF(ifc) \
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do { \
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IF_CLONE_LOCK(ifc); \
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IF_CLONE_REMREF_LOCKED(ifc); \
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} while (0)
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#define IF_CLONE_REMREF_LOCKED(ifc) \
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do { \
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IF_CLONE_LOCK_ASSERT(ifc); \
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KASSERT((ifc)->ifc_refcnt > 0, \
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("bogus refcnt %ld", (ifc)->ifc_refcnt)); \
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if (--(ifc)->ifc_refcnt == 0) { \
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IF_CLONE_UNLOCK(ifc); \
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if_clone_free(ifc); \
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} else { \
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/* silently free the lock */ \
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IF_CLONE_UNLOCK(ifc); \
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} \
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} while (0)
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#define IFC_IFLIST_INSERT(_ifc, _ifp) \
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LIST_INSERT_HEAD(&_ifc->ifc_iflist, _ifp, if_clones)
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#define IFC_IFLIST_REMOVE(_ifc, _ifp) \
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LIST_REMOVE(_ifp, if_clones)
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static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
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void
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vnet_if_clone_init(void)
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{
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LIST_INIT(&V_if_cloners);
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}
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void
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if_clone_init(void)
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{
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IF_CLONERS_LOCK_INIT();
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}
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/*
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* Lookup and create a clone network interface.
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*/
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int
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if_clone_create(char *name, size_t len, caddr_t params)
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{
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struct if_clone *ifc;
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/* Try to find an applicable cloner for this request */
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IF_CLONERS_LOCK();
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LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
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if (ifc->ifc_match(ifc, name)) {
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break;
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}
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}
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#ifdef VIMAGE
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if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
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CURVNET_SET_QUIET(vnet0);
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LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
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if (ifc->ifc_match(ifc, name))
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break;
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}
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CURVNET_RESTORE();
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}
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#endif
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IF_CLONERS_UNLOCK();
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if (ifc == NULL)
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return (EINVAL);
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return (if_clone_createif(ifc, name, len, params));
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}
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/*
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* Create a clone network interface.
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*/
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static int
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if_clone_createif(struct if_clone *ifc, char *name, size_t len, caddr_t params)
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{
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int err;
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struct ifnet *ifp;
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if (ifunit(name) != NULL)
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return (EEXIST);
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err = (*ifc->ifc_create)(ifc, name, len, params);
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if (!err) {
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ifp = ifunit(name);
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if (ifp == NULL)
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panic("%s: lookup failed for %s", __func__, name);
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if_addgroup(ifp, ifc->ifc_name);
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IF_CLONE_LOCK(ifc);
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IFC_IFLIST_INSERT(ifc, ifp);
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IF_CLONE_UNLOCK(ifc);
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}
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return (err);
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}
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/*
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* Lookup and destroy a clone network interface.
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*/
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int
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if_clone_destroy(const char *name)
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{
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struct if_clone *ifc;
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struct ifnet *ifp;
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ifp = ifunit(name);
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if (ifp == NULL)
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return (ENXIO);
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/* Find the cloner for this interface */
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IF_CLONERS_LOCK();
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LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
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if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) {
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break;
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}
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}
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#ifdef VIMAGE
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if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
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CURVNET_SET_QUIET(vnet0);
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LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
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if (ifc->ifc_match(ifc, name))
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break;
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}
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CURVNET_RESTORE();
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}
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#endif
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IF_CLONERS_UNLOCK();
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if (ifc == NULL)
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return (EINVAL);
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return (if_clone_destroyif(ifc, ifp));
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}
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/*
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* Destroy a clone network interface.
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*/
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int
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if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
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{
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int err;
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struct ifnet *ifcifp;
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if (ifc->ifc_destroy == NULL)
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return(EOPNOTSUPP);
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/*
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* Given that the cloned ifnet might be attached to a different
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* vnet from where its cloner was registered, we have to
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* switch to the vnet context of the target vnet.
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*/
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CURVNET_SET_QUIET(ifp->if_vnet);
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IF_CLONE_LOCK(ifc);
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LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
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if (ifcifp == ifp) {
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IFC_IFLIST_REMOVE(ifc, ifp);
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break;
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}
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}
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IF_CLONE_UNLOCK(ifc);
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if (ifcifp == NULL) {
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CURVNET_RESTORE();
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return (ENXIO); /* ifp is not on the list. */
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}
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if_delgroup(ifp, ifc->ifc_name);
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err = (*ifc->ifc_destroy)(ifc, ifp);
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if (err != 0) {
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if_addgroup(ifp, ifc->ifc_name);
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IF_CLONE_LOCK(ifc);
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IFC_IFLIST_INSERT(ifc, ifp);
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IF_CLONE_UNLOCK(ifc);
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}
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CURVNET_RESTORE();
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return (err);
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}
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/*
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* Register a network interface cloner.
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*/
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void
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if_clone_attach(struct if_clone *ifc)
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{
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int len, maxclone;
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/*
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* Compute bitmap size and allocate it.
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*/
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maxclone = ifc->ifc_maxunit + 1;
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len = maxclone >> 3;
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if ((len << 3) < maxclone)
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len++;
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ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
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ifc->ifc_bmlen = len;
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IF_CLONE_LOCK_INIT(ifc);
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IF_CLONE_ADDREF(ifc);
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IF_CLONERS_LOCK();
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LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list);
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V_if_cloners_count++;
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IF_CLONERS_UNLOCK();
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LIST_INIT(&ifc->ifc_iflist);
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if (ifc->ifc_attach != NULL)
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(*ifc->ifc_attach)(ifc);
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EVENTHANDLER_INVOKE(if_clone_event, ifc);
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}
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/*
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* Unregister a network interface cloner.
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*/
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void
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if_clone_detach(struct if_clone *ifc)
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{
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struct ifc_simple_data *ifcs = ifc->ifc_data;
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IF_CLONERS_LOCK();
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LIST_REMOVE(ifc, ifc_list);
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V_if_cloners_count--;
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IF_CLONERS_UNLOCK();
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/* Allow all simples to be destroyed */
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if (ifc->ifc_attach == ifc_simple_attach)
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ifcs->ifcs_minifs = 0;
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/* destroy all interfaces for this cloner */
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while (!LIST_EMPTY(&ifc->ifc_iflist))
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if_clone_destroyif(ifc, LIST_FIRST(&ifc->ifc_iflist));
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IF_CLONE_REMREF(ifc);
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}
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static void
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if_clone_free(struct if_clone *ifc)
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{
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for (int bytoff = 0; bytoff < ifc->ifc_bmlen; bytoff++) {
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KASSERT(ifc->ifc_units[bytoff] == 0x00,
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("ifc_units[%d] is not empty", bytoff));
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}
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KASSERT(LIST_EMPTY(&ifc->ifc_iflist),
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("%s: ifc_iflist not empty", __func__));
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IF_CLONE_LOCK_DESTROY(ifc);
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free(ifc->ifc_units, M_CLONE);
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}
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/*
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* Provide list of interface cloners to userspace.
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*/
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int
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if_clone_list(struct if_clonereq *ifcr)
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{
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char *buf, *dst, *outbuf = NULL;
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struct if_clone *ifc;
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int buf_count, count, err = 0;
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if (ifcr->ifcr_count < 0)
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return (EINVAL);
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IF_CLONERS_LOCK();
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/*
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* Set our internal output buffer size. We could end up not
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* reporting a cloner that is added between the unlock and lock
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* below, but that's not a major problem. Not caping our
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* allocation to the number of cloners actually in the system
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* could be because that would let arbitrary users cause us to
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* allocate abritrary amounts of kernel memory.
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*/
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buf_count = (V_if_cloners_count < ifcr->ifcr_count) ?
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V_if_cloners_count : ifcr->ifcr_count;
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IF_CLONERS_UNLOCK();
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outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
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IF_CLONERS_LOCK();
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ifcr->ifcr_total = V_if_cloners_count;
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if ((dst = ifcr->ifcr_buffer) == NULL) {
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/* Just asking how many there are. */
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goto done;
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}
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count = (V_if_cloners_count < buf_count) ?
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V_if_cloners_count : buf_count;
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for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf;
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ifc != NULL && count != 0;
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ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
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strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
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}
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done:
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IF_CLONERS_UNLOCK();
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if (err == 0)
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err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
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if (outbuf != NULL)
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free(outbuf, M_CLONE);
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return (err);
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}
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/*
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* A utility function to extract unit numbers from interface names of
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* the form name###.
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*
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* Returns 0 on success and an error on failure.
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*/
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int
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ifc_name2unit(const char *name, int *unit)
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{
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const char *cp;
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int cutoff = INT_MAX / 10;
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int cutlim = INT_MAX % 10;
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for (cp = name; *cp != '\0' && (*cp < '0' || *cp > '9'); cp++);
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if (*cp == '\0') {
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*unit = -1;
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} else if (cp[0] == '0' && cp[1] != '\0') {
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/* Disallow leading zeroes. */
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return (EINVAL);
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} else {
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for (*unit = 0; *cp != '\0'; cp++) {
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if (*cp < '0' || *cp > '9') {
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/* Bogus unit number. */
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return (EINVAL);
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}
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if (*unit > cutoff ||
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(*unit == cutoff && *cp - '0' > cutlim))
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return (EINVAL);
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*unit = (*unit * 10) + (*cp - '0');
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}
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}
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return (0);
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}
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int
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ifc_alloc_unit(struct if_clone *ifc, int *unit)
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{
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int wildcard, bytoff, bitoff;
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int err = 0;
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IF_CLONE_LOCK(ifc);
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bytoff = bitoff = 0;
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wildcard = (*unit < 0);
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/*
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* Find a free unit if none was given.
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*/
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if (wildcard) {
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while ((bytoff < ifc->ifc_bmlen)
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&& (ifc->ifc_units[bytoff] == 0xff))
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bytoff++;
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if (bytoff >= ifc->ifc_bmlen) {
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err = ENOSPC;
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goto done;
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}
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while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
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bitoff++;
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*unit = (bytoff << 3) + bitoff;
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}
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if (*unit > ifc->ifc_maxunit) {
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err = ENOSPC;
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goto done;
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}
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if (!wildcard) {
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bytoff = *unit >> 3;
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bitoff = *unit - (bytoff << 3);
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}
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if((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) {
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err = EEXIST;
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goto done;
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}
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/*
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* Allocate the unit in the bitmap.
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*/
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KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
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("%s: bit is already set", __func__));
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ifc->ifc_units[bytoff] |= (1 << bitoff);
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IF_CLONE_ADDREF_LOCKED(ifc);
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done:
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IF_CLONE_UNLOCK(ifc);
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return (err);
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}
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void
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ifc_free_unit(struct if_clone *ifc, int unit)
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{
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int bytoff, bitoff;
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/*
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* Compute offset in the bitmap and deallocate the unit.
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*/
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bytoff = unit >> 3;
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bitoff = unit - (bytoff << 3);
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IF_CLONE_LOCK(ifc);
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KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
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("%s: bit is already cleared", __func__));
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ifc->ifc_units[bytoff] &= ~(1 << bitoff);
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IF_CLONE_REMREF_LOCKED(ifc); /* releases lock */
|
|
}
|
|
|
|
void
|
|
ifc_simple_attach(struct if_clone *ifc)
|
|
{
|
|
int err;
|
|
int unit;
|
|
char name[IFNAMSIZ];
|
|
struct ifc_simple_data *ifcs = ifc->ifc_data;
|
|
|
|
KASSERT(ifcs->ifcs_minifs - 1 <= ifc->ifc_maxunit,
|
|
("%s: %s requested more units than allowed (%d > %d)",
|
|
__func__, ifc->ifc_name, ifcs->ifcs_minifs,
|
|
ifc->ifc_maxunit + 1));
|
|
|
|
for (unit = 0; unit < ifcs->ifcs_minifs; unit++) {
|
|
snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
|
|
err = if_clone_createif(ifc, name, IFNAMSIZ, NULL);
|
|
KASSERT(err == 0,
|
|
("%s: failed to create required interface %s",
|
|
__func__, name));
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
int
|
|
ifc_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
|
|
{
|
|
char *dp;
|
|
int wildcard;
|
|
int unit;
|
|
int err;
|
|
struct ifc_simple_data *ifcs = ifc->ifc_data;
|
|
|
|
err = ifc_name2unit(name, &unit);
|
|
if (err != 0)
|
|
return (err);
|
|
|
|
wildcard = (unit < 0);
|
|
|
|
err = ifc_alloc_unit(ifc, &unit);
|
|
if (err != 0)
|
|
return (err);
|
|
|
|
err = ifcs->ifcs_create(ifc, unit, params);
|
|
if (err != 0) {
|
|
ifc_free_unit(ifc, unit);
|
|
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");
|
|
}
|
|
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
|
|
{
|
|
int unit;
|
|
struct ifc_simple_data *ifcs = ifc->ifc_data;
|
|
|
|
unit = ifp->if_dunit;
|
|
|
|
if (unit < ifcs->ifcs_minifs)
|
|
return (EINVAL);
|
|
|
|
ifcs->ifcs_destroy(ifp);
|
|
|
|
ifc_free_unit(ifc, unit);
|
|
|
|
return (0);
|
|
}
|