321 lines
8.0 KiB
C
321 lines
8.0 KiB
C
/*-
|
|
* Copyright (c) 2004-2005 Sam Leffler, Errno Consulting
|
|
* 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. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifdef __FreeBSD__
|
|
__FBSDID("$FreeBSD: src/sys/net80211/ieee80211_acl.c,v 1.4 2005/08/13 17:31:48 sam Exp $");
|
|
#endif
|
|
#ifdef __NetBSD__
|
|
__KERNEL_RCSID(0, "$NetBSD: ieee80211_acl.c,v 1.10 2019/11/10 21:16:38 chs Exp $");
|
|
#endif
|
|
|
|
/*
|
|
* IEEE 802.11 MAC ACL support.
|
|
*
|
|
* When this module is loaded the sender address of each received
|
|
* frame is passed to the iac_check method and the module indicates
|
|
* if the frame should be accepted or rejected. If the policy is
|
|
* set to ACL_POLICY_OPEN then all frames are accepted w/o checking
|
|
* the address. Otherwise, the address is looked up in the database
|
|
* and if found the frame is either accepted (ACL_POLICY_ALLOW)
|
|
* or rejected (ACL_POLICY_DENT).
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <sys/socket.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_media.h>
|
|
#include <net/if_ether.h>
|
|
#include <net/route.h>
|
|
|
|
#include <net80211/ieee80211_var.h>
|
|
|
|
enum {
|
|
ACL_POLICY_OPEN = 0, /* open, don't check ACL's */
|
|
ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */
|
|
ACL_POLICY_DENY = 2, /* deny traffic from MAC */
|
|
};
|
|
|
|
#define ACL_HASHSIZE 32
|
|
|
|
struct acl {
|
|
TAILQ_ENTRY(acl) acl_list;
|
|
LIST_ENTRY(acl) acl_hash;
|
|
u_int8_t acl_macaddr[IEEE80211_ADDR_LEN];
|
|
};
|
|
struct aclstate {
|
|
acl_lock_t as_lock;
|
|
int as_policy;
|
|
uint32_t as_nacls;
|
|
TAILQ_HEAD(, acl) as_list; /* list of all ACL's */
|
|
LIST_HEAD(, acl) as_hash[ACL_HASHSIZE];
|
|
struct ieee80211com *as_ic;
|
|
};
|
|
|
|
/* simple hash is enough for variation of macaddr */
|
|
#define ACL_HASH(addr) \
|
|
(((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE)
|
|
|
|
MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl");
|
|
|
|
static int acl_free_all(struct ieee80211com *);
|
|
|
|
static int
|
|
acl_attach(struct ieee80211com *ic)
|
|
{
|
|
struct aclstate *as;
|
|
|
|
as = malloc(sizeof(struct aclstate),
|
|
M_80211_ACL, M_WAITOK | M_ZERO);
|
|
ACL_LOCK_INIT(as, "acl");
|
|
TAILQ_INIT(&as->as_list);
|
|
as->as_policy = ACL_POLICY_OPEN;
|
|
as->as_ic = ic;
|
|
ic->ic_as = as;
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
acl_detach(struct ieee80211com *ic)
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
|
|
acl_free_all(ic);
|
|
ic->ic_as = NULL;
|
|
ACL_LOCK_DESTROY(as);
|
|
free(as, M_DEVBUF);
|
|
}
|
|
|
|
static __inline struct acl *
|
|
_find_acl(struct aclstate *as, const u_int8_t *macaddr)
|
|
{
|
|
struct acl *acl;
|
|
int hash;
|
|
|
|
hash = ACL_HASH(macaddr);
|
|
LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
|
|
if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
|
|
return acl;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
_acl_free(struct aclstate *as, struct acl *acl)
|
|
{
|
|
ACL_LOCK_ASSERT(as);
|
|
|
|
TAILQ_REMOVE(&as->as_list, acl, acl_list);
|
|
LIST_REMOVE(acl, acl_hash);
|
|
free(acl, M_80211_ACL);
|
|
as->as_nacls--;
|
|
}
|
|
|
|
static int
|
|
acl_check(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
|
|
switch (as->as_policy) {
|
|
case ACL_POLICY_OPEN:
|
|
return 1;
|
|
case ACL_POLICY_ALLOW:
|
|
return _find_acl(as, mac) != NULL;
|
|
case ACL_POLICY_DENY:
|
|
return _find_acl(as, mac) == NULL;
|
|
}
|
|
return 0; /* should not happen */
|
|
}
|
|
|
|
static int
|
|
acl_add(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
struct acl *acl, *new;
|
|
int hash;
|
|
|
|
new = malloc(sizeof(struct acl), M_80211_ACL, M_WAITOK | M_ZERO);
|
|
|
|
ACL_LOCK(as);
|
|
hash = ACL_HASH(mac);
|
|
LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
|
|
if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
|
|
ACL_UNLOCK(as);
|
|
free(new, M_80211_ACL);
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
|
|
"ACL: add %s failed, already present\n",
|
|
ether_sprintf(mac));
|
|
return EEXIST;
|
|
}
|
|
}
|
|
IEEE80211_ADDR_COPY(new->acl_macaddr, mac);
|
|
TAILQ_INSERT_TAIL(&as->as_list, new, acl_list);
|
|
LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash);
|
|
as->as_nacls++;
|
|
ACL_UNLOCK(as);
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
|
|
"ACL: add %s\n", ether_sprintf(mac));
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
acl_remove(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
struct acl *acl;
|
|
|
|
ACL_LOCK(as);
|
|
acl = _find_acl(as, mac);
|
|
if (acl != NULL)
|
|
_acl_free(as, acl);
|
|
ACL_UNLOCK(as);
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
|
|
"ACL: remove %s%s\n", ether_sprintf(mac),
|
|
acl == NULL ? ", not present" : "");
|
|
|
|
return (acl == NULL ? ENOENT : 0);
|
|
}
|
|
|
|
static int
|
|
acl_free_all(struct ieee80211com *ic)
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
struct acl *acl;
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
|
|
|
|
ACL_LOCK(as);
|
|
while ((acl = TAILQ_FIRST(&as->as_list)) != NULL)
|
|
_acl_free(as, acl);
|
|
ACL_UNLOCK(as);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
acl_setpolicy(struct ieee80211com *ic, int policy)
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
|
|
IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
|
|
"ACL: set policy to %u\n", policy);
|
|
|
|
switch (policy) {
|
|
case IEEE80211_MACCMD_POLICY_OPEN:
|
|
as->as_policy = ACL_POLICY_OPEN;
|
|
break;
|
|
case IEEE80211_MACCMD_POLICY_ALLOW:
|
|
as->as_policy = ACL_POLICY_ALLOW;
|
|
break;
|
|
case IEEE80211_MACCMD_POLICY_DENY:
|
|
as->as_policy = ACL_POLICY_DENY;
|
|
break;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
acl_getpolicy(struct ieee80211com *ic)
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
|
|
return as->as_policy;
|
|
}
|
|
|
|
static int
|
|
acl_setioctl(struct ieee80211com *ic,
|
|
struct ieee80211req *ireq)
|
|
{
|
|
|
|
return EINVAL;
|
|
}
|
|
|
|
static int
|
|
acl_getioctl(struct ieee80211com *ic, struct ieee80211req *ireq)
|
|
{
|
|
struct aclstate *as = ic->ic_as;
|
|
struct acl *acl;
|
|
struct ieee80211req_maclist *ap;
|
|
int error;
|
|
uint32_t i, space;
|
|
|
|
switch (ireq->i_val) {
|
|
case IEEE80211_MACCMD_POLICY:
|
|
ireq->i_val = as->as_policy;
|
|
return 0;
|
|
case IEEE80211_MACCMD_LIST:
|
|
space = as->as_nacls * IEEE80211_ADDR_LEN;
|
|
if (ireq->i_len == 0) {
|
|
ireq->i_len = space; /* return required space */
|
|
return 0; /* NB: must not error */
|
|
}
|
|
ap = malloc(space, M_TEMP, M_WAITOK);
|
|
i = 0;
|
|
ACL_LOCK(as);
|
|
TAILQ_FOREACH(acl, &as->as_list, acl_list) {
|
|
IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr);
|
|
i++;
|
|
}
|
|
ACL_UNLOCK(as);
|
|
if (ireq->i_len >= space) {
|
|
error = copyout(ap, ireq->i_data, space);
|
|
ireq->i_len = space;
|
|
} else
|
|
error = copyout(ap, ireq->i_data, ireq->i_len);
|
|
free(ap, M_TEMP);
|
|
return error;
|
|
}
|
|
return EINVAL;
|
|
}
|
|
|
|
static const struct ieee80211_aclator mac = {
|
|
.iac_name = "mac",
|
|
.iac_attach = acl_attach,
|
|
.iac_detach = acl_detach,
|
|
.iac_check = acl_check,
|
|
.iac_add = acl_add,
|
|
.iac_remove = acl_remove,
|
|
.iac_flush = acl_free_all,
|
|
.iac_setpolicy = acl_setpolicy,
|
|
.iac_getpolicy = acl_getpolicy,
|
|
.iac_setioctl = acl_setioctl,
|
|
.iac_getioctl = acl_getioctl,
|
|
};
|