freebsd-dev/sys/net/if_clone.h
Kristof Provost b02fd8b790 epair: Do not abuse params to register the second interface
if_epair used the 'params' argument to pass a pointer to the b interface
through if_clone_create().
This pointer can be controlled by userspace, which means it could be abused to
trigger a panic. While this requires PRIV_NET_IFCREATE
privileges those are assigned to vnet jails, which means that vnet jails
could panic the system.

Reported by:	Ilja Van Sprundel <ivansprundel@ioactive.com>
MFC after:	3 days
2020-01-28 22:44:24 +00:00

88 lines
3.4 KiB
C

/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1982, 1986, 1989, 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.
*
* From: @(#)if.h 8.1 (Berkeley) 6/10/93
* $FreeBSD$
*/
#ifndef _NET_IF_CLONE_H_
#define _NET_IF_CLONE_H_
#ifdef _KERNEL
#include <sys/_eventhandler.h>
#define IFC_NOGROUP 0x1
struct if_clone;
/* Methods. */
typedef int ifc_match_t(struct if_clone *, const char *);
typedef int ifc_create_t(struct if_clone *, char *, size_t, caddr_t);
typedef int ifc_destroy_t(struct if_clone *, struct ifnet *);
typedef int ifcs_create_t(struct if_clone *, int, caddr_t);
typedef void ifcs_destroy_t(struct ifnet *);
/* Interface cloner (de)allocating functions. */
struct if_clone *
if_clone_advanced(const char *, u_int, ifc_match_t, ifc_create_t,
ifc_destroy_t);
struct if_clone *
if_clone_simple(const char *, ifcs_create_t, ifcs_destroy_t, u_int);
void if_clone_detach(struct if_clone *);
/* Unit (de)allocating fucntions. */
int ifc_name2unit(const char *name, int *unit);
int ifc_alloc_unit(struct if_clone *, int *);
void ifc_free_unit(struct if_clone *, int);
const char *ifc_name(struct if_clone *);
void ifc_flags_set(struct if_clone *, int flags);
int ifc_flags_get(struct if_clone *);
/* Interface clone event. */
typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
/* The below interfaces used only by net/if.c. */
void vnet_if_clone_init(void);
int if_clone_create(char *, size_t, caddr_t);
int if_clone_destroy(const char *);
int if_clone_list(struct if_clonereq *);
struct if_clone *if_clone_findifc(struct ifnet *);
void if_clone_addgroup(struct ifnet *, struct if_clone *);
/* The below interfaces are used only by epair(4). */
void if_clone_addif(struct if_clone *, struct ifnet *);
int if_clone_destroyif(struct if_clone *, struct ifnet *);
#endif /* _KERNEL */
#endif /* !_NET_IF_CLONE_H_ */