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302 lines
7.5 KiB
C
302 lines
7.5 KiB
C
/*-
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* Copyright (c) 2004-2005 Sam Leffler, Errno Consulting
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* 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* IEEE 802.11 MAC ACL support.
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*
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* When this module is loaded the sender address of each received
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* frame is passed to the iac_check method and the module indicates
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* if the frame should be accepted or rejected. If the policy is
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* set to ACL_POLICY_OPEN then all frames are accepted w/o checking
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* the address. Otherwise, the address is looked up in the database
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* and if found the frame is either accepted (ACL_POLICY_ALLOW)
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* or rejected (ACL_POLICY_DENT).
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net/ethernet.h>
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#include <net/route.h>
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#include <net80211/ieee80211_var.h>
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enum {
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ACL_POLICY_OPEN = 0, /* open, don't check ACL's */
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ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */
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ACL_POLICY_DENY = 2, /* deny traffic from MAC */
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};
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#define ACL_HASHSIZE 32
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struct acl {
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TAILQ_ENTRY(acl) acl_list;
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LIST_ENTRY(acl) acl_hash;
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u_int8_t acl_macaddr[IEEE80211_ADDR_LEN];
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};
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struct aclstate {
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acl_lock_t as_lock;
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int as_policy;
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TAILQ_HEAD(, acl) as_list; /* list of all ACL's */
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LIST_HEAD(, acl) as_hash[ACL_HASHSIZE];
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struct ieee80211com *as_ic;
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};
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/* simple hash is enough for variation of macaddr */
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#define ACL_HASH(addr) \
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(((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE)
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MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl");
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static int acl_free_all(struct ieee80211com *);
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static int
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acl_attach(struct ieee80211com *ic)
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{
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struct aclstate *as;
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MALLOC(as, struct aclstate *, sizeof(struct aclstate),
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M_DEVBUF, M_NOWAIT | M_ZERO);
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if (as == NULL)
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return 0;
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ACL_LOCK_INIT(as, "acl");
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TAILQ_INIT(&as->as_list);
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as->as_policy = ACL_POLICY_OPEN;
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as->as_ic = ic;
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ic->ic_as = as;
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return 1;
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}
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static void
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acl_detach(struct ieee80211com *ic)
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{
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struct aclstate *as = ic->ic_as;
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acl_free_all(ic);
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ic->ic_as = NULL;
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ACL_LOCK_DESTROY(as);
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FREE(as, M_DEVBUF);
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}
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static __inline struct acl *
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_find_acl(struct aclstate *as, const u_int8_t *macaddr)
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{
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struct acl *acl;
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int hash;
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hash = ACL_HASH(macaddr);
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LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
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if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
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return acl;
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}
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return NULL;
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}
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static void
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_acl_free(struct aclstate *as, struct acl *acl)
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{
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ACL_LOCK_ASSERT(as);
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TAILQ_REMOVE(&as->as_list, acl, acl_list);
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LIST_REMOVE(acl, acl_hash);
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FREE(acl, M_80211_ACL);
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}
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static int
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acl_check(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
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{
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struct aclstate *as = ic->ic_as;
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switch (as->as_policy) {
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case ACL_POLICY_OPEN:
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return 1;
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case ACL_POLICY_ALLOW:
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return _find_acl(as, mac) != NULL;
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case ACL_POLICY_DENY:
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return _find_acl(as, mac) == NULL;
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}
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return 0; /* should not happen */
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}
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static int
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acl_add(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
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{
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struct aclstate *as = ic->ic_as;
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struct acl *acl, *new;
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int hash;
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MALLOC(new, struct acl *, sizeof(struct acl), M_80211_ACL, M_NOWAIT | M_ZERO);
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if (new == NULL) {
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
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"ACL: add %s failed, no memory\n", ether_sprintf(mac));
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/* XXX statistic */
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return ENOMEM;
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}
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ACL_LOCK(as);
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hash = ACL_HASH(mac);
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LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
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if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
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ACL_UNLOCK(as);
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FREE(new, M_80211_ACL);
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
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"ACL: add %s failed, already present\n",
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ether_sprintf(mac));
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return EEXIST;
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}
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}
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IEEE80211_ADDR_COPY(new->acl_macaddr, mac);
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TAILQ_INSERT_TAIL(&as->as_list, new, acl_list);
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LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash);
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ACL_UNLOCK(as);
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
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"ACL: add %s\n", ether_sprintf(mac));
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return 0;
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}
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static int
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acl_remove(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
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{
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struct aclstate *as = ic->ic_as;
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struct acl *acl;
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ACL_LOCK(as);
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acl = _find_acl(as, mac);
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if (acl != NULL)
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_acl_free(as, acl);
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ACL_UNLOCK(as);
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
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"ACL: remove %s%s\n", ether_sprintf(mac),
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acl == NULL ? ", not present" : "");
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return (acl == NULL ? ENOENT : 0);
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}
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static int
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acl_free_all(struct ieee80211com *ic)
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{
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struct aclstate *as = ic->ic_as;
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struct acl *acl;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
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ACL_LOCK(as);
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while ((acl = TAILQ_FIRST(&as->as_list)) != NULL)
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_acl_free(as, acl);
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ACL_UNLOCK(as);
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return 0;
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}
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static int
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acl_setpolicy(struct ieee80211com *ic, int policy)
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{
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struct aclstate *as = ic->ic_as;
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IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
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"ACL: set policy to %u\n", policy);
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switch (policy) {
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case IEEE80211_MACCMD_POLICY_OPEN:
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as->as_policy = ACL_POLICY_OPEN;
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break;
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case IEEE80211_MACCMD_POLICY_ALLOW:
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as->as_policy = ACL_POLICY_ALLOW;
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break;
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case IEEE80211_MACCMD_POLICY_DENY:
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as->as_policy = ACL_POLICY_DENY;
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break;
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default:
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return EINVAL;
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}
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return 0;
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}
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static int
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acl_getpolicy(struct ieee80211com *ic)
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{
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struct aclstate *as = ic->ic_as;
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return as->as_policy;
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}
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static const struct ieee80211_aclator mac = {
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.iac_name = "mac",
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.iac_attach = acl_attach,
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.iac_detach = acl_detach,
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.iac_check = acl_check,
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.iac_add = acl_add,
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.iac_remove = acl_remove,
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.iac_flush = acl_free_all,
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.iac_setpolicy = acl_setpolicy,
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.iac_getpolicy = acl_getpolicy,
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};
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/*
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* Module glue.
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*/
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static int
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wlan_acl_modevent(module_t mod, int type, void *unused)
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{
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switch (type) {
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case MOD_LOAD:
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if (bootverbose)
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printf("wlan: <802.11 MAC ACL support>\n");
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ieee80211_aclator_register(&mac);
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return 0;
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case MOD_UNLOAD:
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ieee80211_aclator_unregister(&mac);
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return 0;
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}
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return EINVAL;
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}
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static moduledata_t wlan_acl_mod = {
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"wlan_acl",
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wlan_acl_modevent,
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0
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};
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DECLARE_MODULE(wlan_acl, wlan_acl_mod, SI_SUB_DRIVERS, SI_ORDER_FIRST);
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MODULE_VERSION(wlan_acl, 1);
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MODULE_DEPEND(wlan_acl, wlan, 1, 1, 1);
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