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3aaf0159dd
Reported by: Nikolai Lifanov <lifanov mail.lifanov.com> Pointy hat to: glebius
689 lines
16 KiB
C
689 lines
16 KiB
C
/*-
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* Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
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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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#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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/* Current IF_MAXUNIT expands maximum to 5 characters. */
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#define IFCLOSIZ (IFNAMSIZ - 5)
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/*
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* Structure describing a `cloning' interface.
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*
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* List of locks
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* (c) const until freeing
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* (d) driver specific data, may need external protection.
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* (e) locked by if_cloners_mtx
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* (i) locked by ifc_mtx mtx
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*/
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struct if_clone {
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char ifc_name[IFCLOSIZ]; /* (c) Name of device, e.g. `gif' */
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struct unrhdr *ifc_unrhdr; /* (c) alloc_unr(9) header */
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int ifc_maxunit; /* (c) maximum unit number */
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long ifc_refcnt; /* (i) Reference count. */
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LIST_HEAD(, ifnet) ifc_iflist; /* (i) List of cloned interfaces */
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struct mtx ifc_mtx; /* Mutex to protect members. */
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enum { SIMPLE, ADVANCED } ifc_type; /* (c) */
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/* (c) Driver specific cloning functions. Called with no locks held. */
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union {
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struct { /* advanced cloner */
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ifc_match_t *_ifc_match;
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ifc_create_t *_ifc_create;
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ifc_destroy_t *_ifc_destroy;
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} A;
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struct { /* simple cloner */
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ifcs_create_t *_ifcs_create;
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ifcs_destroy_t *_ifcs_destroy;
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int _ifcs_minifs; /* minimum ifs */
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} S;
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} U;
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#define ifc_match U.A._ifc_match
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#define ifc_create U.A._ifc_create
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#define ifc_destroy U.A._ifc_destroy
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#define ifcs_create U.S._ifcs_create
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#define ifcs_destroy U.S._ifcs_destroy
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#define ifcs_minifs U.S._ifcs_minifs
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LIST_ENTRY(if_clone) ifc_list; /* (e) On list of cloners */
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};
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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 int ifc_simple_match(struct if_clone *, const char *);
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static int ifc_simple_create(struct if_clone *, char *, size_t, caddr_t);
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static int ifc_simple_destroy(struct if_clone *, struct ifnet *);
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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_type == SIMPLE) {
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if (ifc_simple_match(ifc, name))
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break;
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} else {
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if (ifc->ifc_match(ifc, name))
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break;
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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_type == SIMPLE) {
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if (ifc_simple_match(ifc, name))
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break;
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} else {
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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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if (ifc->ifc_type == SIMPLE)
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err = ifc_simple_create(ifc, name, len, params);
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else
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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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int err;
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struct if_clone *ifc;
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struct ifnet *ifp;
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ifp = ifunit_ref(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_type == SIMPLE) {
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if (ifc_simple_match(ifc, name))
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break;
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} else {
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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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if_rele(ifp);
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return (EINVAL);
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}
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err = if_clone_destroyif(ifc, ifp);
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if_rele(ifp);
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return err;
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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_type == ADVANCED && 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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if (ifc->ifc_type == SIMPLE)
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err = ifc_simple_destroy(ifc, ifp);
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else
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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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static struct if_clone *
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if_clone_alloc(const char *name, int maxunit)
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{
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struct if_clone *ifc;
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KASSERT(name != NULL, ("%s: no name\n", __func__));
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ifc = malloc(sizeof(struct if_clone), M_CLONE, M_WAITOK | M_ZERO);
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strncpy(ifc->ifc_name, name, IFCLOSIZ-1);
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IF_CLONE_LOCK_INIT(ifc);
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IF_CLONE_ADDREF(ifc);
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ifc->ifc_maxunit = maxunit ? maxunit : IF_MAXUNIT;
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ifc->ifc_unrhdr = new_unrhdr(0, ifc->ifc_maxunit, &ifc->ifc_mtx);
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LIST_INIT(&ifc->ifc_iflist);
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return (ifc);
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}
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static int
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if_clone_attach(struct if_clone *ifc)
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{
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struct if_clone *ifc1;
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IF_CLONERS_LOCK();
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LIST_FOREACH(ifc1, &V_if_cloners, ifc_list)
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if (strcmp(ifc->ifc_name, ifc1->ifc_name) == 0) {
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IF_CLONERS_UNLOCK();
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IF_CLONE_REMREF(ifc);
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return (EEXIST);
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}
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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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return (0);
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}
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struct if_clone *
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if_clone_advanced(const char *name, u_int maxunit, ifc_match_t match,
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ifc_create_t create, ifc_destroy_t destroy)
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{
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struct if_clone *ifc;
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ifc = if_clone_alloc(name, maxunit);
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ifc->ifc_type = ADVANCED;
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ifc->ifc_match = match;
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ifc->ifc_create = create;
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ifc->ifc_destroy = destroy;
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if (if_clone_attach(ifc) != 0) {
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if_clone_free(ifc);
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return (NULL);
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}
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EVENTHANDLER_INVOKE(if_clone_event, ifc);
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return (ifc);
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}
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struct if_clone *
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if_clone_simple(const char *name, ifcs_create_t create, ifcs_destroy_t destroy,
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u_int minifs)
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{
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struct if_clone *ifc;
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u_int unit;
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ifc = if_clone_alloc(name, 0);
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ifc->ifc_type = SIMPLE;
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ifc->ifcs_create = create;
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ifc->ifcs_destroy = destroy;
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ifc->ifcs_minifs = minifs;
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if (if_clone_attach(ifc) != 0) {
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if_clone_free(ifc);
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return (NULL);
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}
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for (unit = 0; unit < minifs; unit++) {
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char name[IFNAMSIZ];
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int error;
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snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
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error = if_clone_createif(ifc, name, IFNAMSIZ, NULL);
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KASSERT(error == 0,
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("%s: failed to create required interface %s",
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__func__, name));
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}
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EVENTHANDLER_INVOKE(if_clone_event, ifc);
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return (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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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_type == SIMPLE)
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ifc->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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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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delete_unrhdr(ifc->ifc_unrhdr);
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free(ifc, 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
|
|
* allocate abritrary 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)
|
|
err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
|
|
if (outbuf != NULL)
|
|
free(outbuf, M_CLONE);
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* 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);
|
|
}
|
|
|
|
int
|
|
ifc_alloc_unit(struct if_clone *ifc, int *unit)
|
|
{
|
|
char name[IFNAMSIZ];
|
|
int wildcard;
|
|
|
|
wildcard = (*unit < 0);
|
|
retry:
|
|
if (*unit > ifc->ifc_maxunit)
|
|
return (ENOSPC);
|
|
if (*unit < 0) {
|
|
*unit = alloc_unr(ifc->ifc_unrhdr);
|
|
if (*unit == -1)
|
|
return (ENOSPC);
|
|
} else {
|
|
*unit = alloc_unr_specific(ifc->ifc_unrhdr, *unit);
|
|
if (*unit == -1) {
|
|
if (wildcard) {
|
|
(*unit)++;
|
|
goto retry;
|
|
} else
|
|
return (EEXIST);
|
|
}
|
|
}
|
|
|
|
snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, *unit);
|
|
if (ifunit(name) != NULL) {
|
|
free_unr(ifc->ifc_unrhdr, *unit);
|
|
if (wildcard) {
|
|
(*unit)++;
|
|
goto retry;
|
|
} else
|
|
return (EEXIST);
|
|
}
|
|
|
|
IF_CLONE_ADDREF(ifc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
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_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
|
|
{
|
|
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);
|
|
|
|
err = ifc->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);
|
|
}
|
|
|
|
static int
|
|
ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
|
|
{
|
|
int unit;
|
|
|
|
unit = ifp->if_dunit;
|
|
|
|
if (unit < ifc->ifcs_minifs)
|
|
return (EINVAL);
|
|
|
|
ifc->ifcs_destroy(ifp);
|
|
|
|
ifc_free_unit(ifc, unit);
|
|
|
|
return (0);
|
|
}
|