The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_acl.c

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    1 /*-
    2  * Copyright (c) 2004-2005 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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.
   13  * 3. The name of the author may not be used to endorse or promote products
   14  *    derived from this software without specific prior written permission.
   15  *
   16  * Alternatively, this software may be distributed under the terms of the
   17  * GNU General Public License ("GPL") version 2 as published by the Free
   18  * Software Foundation.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   25  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   29  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 #ifdef __FreeBSD__
   34 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_acl.c,v 1.4 2005/08/13 17:31:48 sam Exp $");
   35 #endif
   36 #ifdef __NetBSD__
   37 __KERNEL_RCSID(0, "$NetBSD: ieee80211_acl.c,v 1.8 2008/12/17 20:51:37 cegger Exp $");
   38 #endif
   39 
   40 /*
   41  * IEEE 802.11 MAC ACL support.
   42  *
   43  * When this module is loaded the sender address of each received
   44  * frame is passed to the iac_check method and the module indicates
   45  * if the frame should be accepted or rejected.  If the policy is
   46  * set to ACL_POLICY_OPEN then all frames are accepted w/o checking
   47  * the address.  Otherwise, the address is looked up in the database
   48  * and if found the frame is either accepted (ACL_POLICY_ALLOW)
   49  * or rejected (ACL_POLICY_DENT).
   50  */
   51 #include <sys/param.h>
   52 #include <sys/kernel.h>
   53 #include <sys/systm.h> 
   54 #include <sys/mbuf.h>   
   55 #include <sys/queue.h>
   56 
   57 #include <sys/socket.h>
   58 
   59 #include <net/if.h>
   60 #include <net/if_media.h>
   61 #include <net/if_ether.h>
   62 #include <net/route.h>
   63 
   64 #include <net80211/ieee80211_var.h>
   65 
   66 enum {
   67         ACL_POLICY_OPEN         = 0,    /* open, don't check ACL's */
   68         ACL_POLICY_ALLOW        = 1,    /* allow traffic from MAC */
   69         ACL_POLICY_DENY         = 2,    /* deny traffic from MAC */
   70 };
   71 
   72 #define ACL_HASHSIZE    32
   73 
   74 struct acl {
   75         TAILQ_ENTRY(acl)        acl_list;
   76         LIST_ENTRY(acl)         acl_hash;
   77         u_int8_t                acl_macaddr[IEEE80211_ADDR_LEN];
   78 };
   79 struct aclstate {
   80         acl_lock_t              as_lock;
   81         int                     as_policy;
   82         int                     as_nacls;
   83         TAILQ_HEAD(, acl)       as_list;        /* list of all ACL's */
   84         LIST_HEAD(, acl)        as_hash[ACL_HASHSIZE];
   85         struct ieee80211com     *as_ic;
   86 };
   87 
   88 /* simple hash is enough for variation of macaddr */
   89 #define ACL_HASH(addr)  \
   90         (((const u_int8_t *)(addr))[IEEE80211_ADDR_LEN - 1] % ACL_HASHSIZE)
   91 
   92 MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl");
   93 
   94 static  int acl_free_all(struct ieee80211com *);
   95 
   96 static int
   97 acl_attach(struct ieee80211com *ic)
   98 {
   99         struct aclstate *as;
  100 
  101         as = malloc(sizeof(struct aclstate),
  102                 M_80211_ACL, M_NOWAIT | M_ZERO);
  103         if (as == NULL)
  104                 return 0;
  105         ACL_LOCK_INIT(as, "acl");
  106         TAILQ_INIT(&as->as_list);
  107         as->as_policy = ACL_POLICY_OPEN;
  108         as->as_ic = ic;
  109         ic->ic_as = as;
  110         return 1;
  111 }
  112 
  113 static void
  114 acl_detach(struct ieee80211com *ic)
  115 {
  116         struct aclstate *as = ic->ic_as;
  117 
  118         acl_free_all(ic);
  119         ic->ic_as = NULL;
  120         ACL_LOCK_DESTROY(as);
  121         free(as, M_DEVBUF);
  122 }
  123 
  124 static __inline struct acl *
  125 _find_acl(struct aclstate *as, const u_int8_t *macaddr)
  126 {
  127         struct acl *acl;
  128         int hash;
  129 
  130         hash = ACL_HASH(macaddr);
  131         LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
  132                 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
  133                         return acl;
  134         }
  135         return NULL;
  136 }
  137 
  138 static void
  139 _acl_free(struct aclstate *as, struct acl *acl)
  140 {
  141         ACL_LOCK_ASSERT(as);
  142 
  143         TAILQ_REMOVE(&as->as_list, acl, acl_list);
  144         LIST_REMOVE(acl, acl_hash);
  145         free(acl, M_80211_ACL);
  146         as->as_nacls--;
  147 }
  148 
  149 static int
  150 acl_check(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
  151 {
  152         struct aclstate *as = ic->ic_as;
  153 
  154         switch (as->as_policy) {
  155         case ACL_POLICY_OPEN:
  156                 return 1;
  157         case ACL_POLICY_ALLOW:
  158                 return _find_acl(as, mac) != NULL;
  159         case ACL_POLICY_DENY:
  160                 return _find_acl(as, mac) == NULL;
  161         }
  162         return 0;               /* should not happen */
  163 }
  164 
  165 static int
  166 acl_add(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
  167 {
  168         struct aclstate *as = ic->ic_as;
  169         struct acl *acl, *new;
  170         int hash;
  171 
  172         new = malloc(sizeof(struct acl), M_80211_ACL, M_NOWAIT | M_ZERO);
  173         if (new == NULL) {
  174                 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
  175                         "ACL: add %s failed, no memory\n", ether_sprintf(mac));
  176                 /* XXX statistic */
  177                 return ENOMEM;
  178         }
  179 
  180         ACL_LOCK(as);
  181         hash = ACL_HASH(mac);
  182         LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
  183                 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
  184                         ACL_UNLOCK(as);
  185                         free(new, M_80211_ACL);
  186                         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
  187                                 "ACL: add %s failed, already present\n",
  188                                 ether_sprintf(mac));
  189                         return EEXIST;
  190                 }
  191         }
  192         IEEE80211_ADDR_COPY(new->acl_macaddr, mac);
  193         TAILQ_INSERT_TAIL(&as->as_list, new, acl_list);
  194         LIST_INSERT_HEAD(&as->as_hash[hash], new, acl_hash);
  195         as->as_nacls++;
  196         ACL_UNLOCK(as);
  197 
  198         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
  199                 "ACL: add %s\n", ether_sprintf(mac));
  200         return 0;
  201 }
  202 
  203 static int
  204 acl_remove(struct ieee80211com *ic, const u_int8_t mac[IEEE80211_ADDR_LEN])
  205 {
  206         struct aclstate *as = ic->ic_as;
  207         struct acl *acl;
  208 
  209         ACL_LOCK(as);
  210         acl = _find_acl(as, mac);
  211         if (acl != NULL)
  212                 _acl_free(as, acl);
  213         ACL_UNLOCK(as);
  214 
  215         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
  216                 "ACL: remove %s%s\n", ether_sprintf(mac),
  217                 acl == NULL ? ", not present" : "");
  218 
  219         return (acl == NULL ? ENOENT : 0);
  220 }
  221 
  222 static int
  223 acl_free_all(struct ieee80211com *ic)
  224 {
  225         struct aclstate *as = ic->ic_as;
  226         struct acl *acl;
  227 
  228         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
  229 
  230         ACL_LOCK(as);
  231         while ((acl = TAILQ_FIRST(&as->as_list)) != NULL)
  232                 _acl_free(as, acl);
  233         ACL_UNLOCK(as);
  234 
  235         return 0;
  236 }
  237 
  238 static int
  239 acl_setpolicy(struct ieee80211com *ic, int policy)
  240 {
  241         struct aclstate *as = ic->ic_as;
  242 
  243         IEEE80211_DPRINTF(ic, IEEE80211_MSG_ACL,
  244                 "ACL: set policy to %u\n", policy);
  245 
  246         switch (policy) {
  247         case IEEE80211_MACCMD_POLICY_OPEN:
  248                 as->as_policy = ACL_POLICY_OPEN;
  249                 break;
  250         case IEEE80211_MACCMD_POLICY_ALLOW:
  251                 as->as_policy = ACL_POLICY_ALLOW;
  252                 break;
  253         case IEEE80211_MACCMD_POLICY_DENY:
  254                 as->as_policy = ACL_POLICY_DENY;
  255                 break;
  256         default:
  257                 return EINVAL;
  258         }
  259         return 0;
  260 }
  261 
  262 static int
  263 acl_getpolicy(struct ieee80211com *ic)
  264 {
  265         struct aclstate *as = ic->ic_as;
  266 
  267         return as->as_policy;
  268 }
  269 
  270 static int
  271 acl_setioctl(struct ieee80211com *ic,
  272     struct ieee80211req *ireq)
  273 {
  274 
  275         return EINVAL;
  276 }
  277 
  278 static int
  279 acl_getioctl(struct ieee80211com *ic, struct ieee80211req *ireq)
  280 {
  281         struct aclstate *as = ic->ic_as;
  282         struct acl *acl;
  283         struct ieee80211req_maclist *ap;
  284         int error, space, i;
  285 
  286         switch (ireq->i_val) {
  287         case IEEE80211_MACCMD_POLICY:
  288                 ireq->i_val = as->as_policy;
  289                 return 0;
  290         case IEEE80211_MACCMD_LIST:
  291                 space = as->as_nacls * IEEE80211_ADDR_LEN;
  292                 if (ireq->i_len == 0) {
  293                         ireq->i_len = space;    /* return required space */
  294                         return 0;               /* NB: must not error */
  295                 }
  296                 ap = malloc(space, M_TEMP, M_NOWAIT);
  297                 if (ap == NULL)
  298                         return ENOMEM;
  299                 i = 0;
  300                 ACL_LOCK(as);
  301                 TAILQ_FOREACH(acl, &as->as_list, acl_list) {
  302                         IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr);
  303                         i++;
  304                 }
  305                 ACL_UNLOCK(as);
  306                 if (ireq->i_len >= space) {
  307                         error = copyout(ap, ireq->i_data, space);
  308                         ireq->i_len = space;
  309                 } else
  310                         error = copyout(ap, ireq->i_data, ireq->i_len);
  311                 free(ap, M_TEMP);
  312                 return error;
  313         }
  314         return EINVAL;
  315 }
  316 
  317 static const struct ieee80211_aclator mac = {
  318         .iac_name       = "mac",
  319         .iac_attach     = acl_attach,
  320         .iac_detach     = acl_detach,
  321         .iac_check      = acl_check,
  322         .iac_add        = acl_add,
  323         .iac_remove     = acl_remove,
  324         .iac_flush      = acl_free_all,
  325         .iac_setpolicy  = acl_setpolicy,
  326         .iac_getpolicy  = acl_getpolicy,
  327         .iac_setioctl   = acl_setioctl,
  328         .iac_getioctl   = acl_getioctl,
  329 };

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