2 * Copyright (c) 2004-2008 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 * IEEE 802.11 MAC ACL support.
32 * When this module is loaded the sender address of each auth mgt
33 * frame is passed to the iac_check method and the module indicates
34 * if the frame should be accepted or rejected. If the policy is
35 * set to ACL_POLICY_OPEN then all frames are accepted w/o checking
36 * the address. Otherwise, the address is looked up in the database
37 * and if found the frame is either accepted (ACL_POLICY_ALLOW)
38 * or rejected (ACL_POLICY_DENT).
42 #include <sys/param.h>
43 #include <sys/kernel.h>
44 #include <sys/systm.h>
46 #include <sys/module.h>
47 #include <sys/queue.h>
49 #include <sys/socket.h>
52 #include <net/if_media.h>
53 #include <net/ethernet.h>
54 #include <net/route.h>
56 #include <net80211/ieee80211_var.h>
59 ACL_POLICY_OPEN = 0, /* open, don't check ACL's */
60 ACL_POLICY_ALLOW = 1, /* allow traffic from MAC */
61 ACL_POLICY_DENY = 2, /* deny traffic from MAC */
63 * NB: ACL_POLICY_RADIUS must be the same value as
64 * IEEE80211_MACCMD_POLICY_RADIUS because of the way
65 * acl_getpolicy() works.
67 ACL_POLICY_RADIUS = 7, /* defer to RADIUS ACL server */
70 #define ACL_HASHSIZE 32
73 TAILQ_ENTRY(acl) acl_list;
74 LIST_ENTRY(acl) acl_hash;
75 uint8_t acl_macaddr[IEEE80211_ADDR_LEN];
81 TAILQ_HEAD(, acl) as_list; /* list of all ACL's */
82 LIST_HEAD(, acl) as_hash[ACL_HASHSIZE];
83 struct ieee80211vap *as_vap;
86 /* simple hash is enough for variation of macaddr */
87 #define ACL_HASH(addr) \
88 (((const uint8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE)
90 static MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl");
92 static int acl_free_all(struct ieee80211vap *);
94 /* number of references from net80211 layer */
98 acl_attach(struct ieee80211vap *vap)
102 as = (struct aclstate *) malloc(sizeof(struct aclstate),
103 M_80211_ACL, M_NOWAIT | M_ZERO);
106 ACL_LOCK_INIT(as, "acl");
107 TAILQ_INIT(&as->as_list);
108 as->as_policy = ACL_POLICY_OPEN;
111 nrefs++; /* NB: we assume caller locking */
116 acl_detach(struct ieee80211vap *vap)
118 struct aclstate *as = vap->iv_as;
120 KASSERT(nrefs > 0, ("imbalanced attach/detach"));
121 nrefs--; /* NB: we assume caller locking */
125 ACL_LOCK_DESTROY(as);
126 free(as, M_80211_ACL);
129 static __inline struct acl *
130 _find_acl(struct aclstate *as, const uint8_t *macaddr)
135 hash = ACL_HASH(macaddr);
136 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
137 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
144 _acl_free(struct aclstate *as, struct acl *acl)
148 TAILQ_REMOVE(&as->as_list, acl, acl_list);
149 LIST_REMOVE(acl, acl_hash);
150 free(acl, M_80211_ACL);
155 acl_check(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
157 struct aclstate *as = vap->iv_as;
159 switch (as->as_policy) {
160 case ACL_POLICY_OPEN:
161 case ACL_POLICY_RADIUS:
163 case ACL_POLICY_ALLOW:
164 return _find_acl(as, mac) != NULL;
165 case ACL_POLICY_DENY:
166 return _find_acl(as, mac) == NULL;
168 return 0; /* should not happen */
172 acl_add(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
174 struct aclstate *as = vap->iv_as;
175 struct acl *acl, *new;
178 new = (struct acl *) malloc(sizeof(struct acl), M_80211_ACL, M_NOWAIT | M_ZERO);
180 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
181 "ACL: add %s failed, no memory\n", ether_sprintf(mac));
187 hash = ACL_HASH(mac);
188 LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
189 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
191 free(new, M_80211_ACL);
192 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
193 "ACL: add %s failed, already present\n",
198 IEEE80211_ADDR_COPY(new->acl_macaddr, mac);
199 TAILQ_INSERT_TAIL(&as->as_list, new, acl_list);
200 LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash);
204 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
205 "ACL: add %s\n", ether_sprintf(mac));
210 acl_remove(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
212 struct aclstate *as = vap->iv_as;
216 acl = _find_acl(as, mac);
221 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
222 "ACL: remove %s%s\n", ether_sprintf(mac),
223 acl == NULL ? ", not present" : "");
225 return (acl == NULL ? ENOENT : 0);
229 acl_free_all(struct ieee80211vap *vap)
231 struct aclstate *as = vap->iv_as;
234 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
237 while ((acl = TAILQ_FIRST(&as->as_list)) != NULL)
245 acl_setpolicy(struct ieee80211vap *vap, int policy)
247 struct aclstate *as = vap->iv_as;
249 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
250 "ACL: set policy to %u\n", policy);
253 case IEEE80211_MACCMD_POLICY_OPEN:
254 as->as_policy = ACL_POLICY_OPEN;
256 case IEEE80211_MACCMD_POLICY_ALLOW:
257 as->as_policy = ACL_POLICY_ALLOW;
259 case IEEE80211_MACCMD_POLICY_DENY:
260 as->as_policy = ACL_POLICY_DENY;
262 case IEEE80211_MACCMD_POLICY_RADIUS:
263 as->as_policy = ACL_POLICY_RADIUS;
272 acl_getpolicy(struct ieee80211vap *vap)
274 struct aclstate *as = vap->iv_as;
276 return as->as_policy;
280 acl_setioctl(struct ieee80211vap *vap, struct ieee80211req *ireq)
287 acl_getioctl(struct ieee80211vap *vap, struct ieee80211req *ireq)
289 struct aclstate *as = vap->iv_as;
291 struct ieee80211req_maclist *ap;
295 switch (ireq->i_val) {
296 case IEEE80211_MACCMD_POLICY:
297 ireq->i_val = as->as_policy;
299 case IEEE80211_MACCMD_LIST:
300 space = as->as_nacls * IEEE80211_ADDR_LEN;
301 if (ireq->i_len == 0) {
302 ireq->i_len = space; /* return required space */
303 return 0; /* NB: must not error */
305 ap = (struct ieee80211req_maclist *) malloc(space,
311 TAILQ_FOREACH(acl, &as->as_list, acl_list) {
312 IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr);
316 if (ireq->i_len >= space) {
317 error = copyout(ap, ireq->i_data, space);
320 error = copyout(ap, ireq->i_data, ireq->i_len);
327 static const struct ieee80211_aclator mac = {
329 .iac_attach = acl_attach,
330 .iac_detach = acl_detach,
331 .iac_check = acl_check,
333 .iac_remove = acl_remove,
334 .iac_flush = acl_free_all,
335 .iac_setpolicy = acl_setpolicy,
336 .iac_getpolicy = acl_getpolicy,
337 .iac_setioctl = acl_setioctl,
338 .iac_getioctl = acl_getioctl,
340 IEEE80211_ACL_MODULE(wlan_acl, mac, 1);