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) 2004-2008 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  *
   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.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.0/sys/net80211/ieee80211_acl.c 228622 2011-12-17 10:32:31Z bschmidt $");
   28 
   29 /*
   30  * IEEE 802.11 MAC ACL support.
   31  *
   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).
   39  */
   40 #include "opt_wlan.h"
   41 
   42 #include <sys/param.h>
   43 #include <sys/kernel.h>
   44 #include <sys/systm.h> 
   45 #include <sys/mbuf.h>   
   46 #include <sys/module.h>
   47 #include <sys/queue.h>
   48 
   49 #include <sys/socket.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_media.h>
   53 #include <net/ethernet.h>
   54 #include <net/route.h>
   55 
   56 #include <net80211/ieee80211_var.h>
   57 
   58 enum {
   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 */
   62         /*
   63          * NB: ACL_POLICY_RADIUS must be the same value as
   64          *     IEEE80211_MACCMD_POLICY_RADIUS because of the way
   65          *     acl_getpolicy() works.
   66          */
   67         ACL_POLICY_RADIUS       = 7,    /* defer to RADIUS ACL server */
   68 };
   69 
   70 #define ACL_HASHSIZE    32
   71 
   72 struct acl {
   73         TAILQ_ENTRY(acl)        acl_list;
   74         LIST_ENTRY(acl)         acl_hash;
   75         uint8_t                 acl_macaddr[IEEE80211_ADDR_LEN];
   76 };
   77 struct aclstate {
   78         acl_lock_t              as_lock;
   79         int                     as_policy;
   80         uint32_t                as_nacls;
   81         TAILQ_HEAD(, acl)       as_list;        /* list of all ACL's */
   82         LIST_HEAD(, acl)        as_hash[ACL_HASHSIZE];
   83         struct ieee80211vap     *as_vap;
   84 };
   85 
   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)
   89 
   90 static MALLOC_DEFINE(M_80211_ACL, "acl", "802.11 station acl");
   91 
   92 static  int acl_free_all(struct ieee80211vap *);
   93 
   94 /* number of references from net80211 layer */
   95 static  int nrefs = 0;
   96 
   97 static int
   98 acl_attach(struct ieee80211vap *vap)
   99 {
  100         struct aclstate *as;
  101 
  102         as = (struct aclstate *) malloc(sizeof(struct aclstate),
  103                 M_80211_ACL, M_NOWAIT | M_ZERO);
  104         if (as == NULL)
  105                 return 0;
  106         ACL_LOCK_INIT(as, "acl");
  107         TAILQ_INIT(&as->as_list);
  108         as->as_policy = ACL_POLICY_OPEN;
  109         as->as_vap = vap;
  110         vap->iv_as = as;
  111         nrefs++;                        /* NB: we assume caller locking */
  112         return 1;
  113 }
  114 
  115 static void
  116 acl_detach(struct ieee80211vap *vap)
  117 {
  118         struct aclstate *as = vap->iv_as;
  119 
  120         KASSERT(nrefs > 0, ("imbalanced attach/detach"));
  121         nrefs--;                        /* NB: we assume caller locking */
  122 
  123         acl_free_all(vap);
  124         vap->iv_as = NULL;
  125         ACL_LOCK_DESTROY(as);
  126         free(as, M_80211_ACL);
  127 }
  128 
  129 static __inline struct acl *
  130 _find_acl(struct aclstate *as, const uint8_t *macaddr)
  131 {
  132         struct acl *acl;
  133         int hash;
  134 
  135         hash = ACL_HASH(macaddr);
  136         LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
  137                 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, macaddr))
  138                         return acl;
  139         }
  140         return NULL;
  141 }
  142 
  143 static void
  144 _acl_free(struct aclstate *as, struct acl *acl)
  145 {
  146         ACL_LOCK_ASSERT(as);
  147 
  148         TAILQ_REMOVE(&as->as_list, acl, acl_list);
  149         LIST_REMOVE(acl, acl_hash);
  150         free(acl, M_80211_ACL);
  151         as->as_nacls--;
  152 }
  153 
  154 static int
  155 acl_check(struct ieee80211vap *vap, const struct ieee80211_frame *wh)
  156 {
  157         struct aclstate *as = vap->iv_as;
  158 
  159         switch (as->as_policy) {
  160         case ACL_POLICY_OPEN:
  161         case ACL_POLICY_RADIUS:
  162                 return 1;
  163         case ACL_POLICY_ALLOW:
  164                 return _find_acl(as, wh->i_addr2) != NULL;
  165         case ACL_POLICY_DENY:
  166                 return _find_acl(as, wh->i_addr2) == NULL;
  167         }
  168         return 0;               /* should not happen */
  169 }
  170 
  171 static int
  172 acl_add(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
  173 {
  174         struct aclstate *as = vap->iv_as;
  175         struct acl *acl, *new;
  176         int hash;
  177 
  178         new = (struct acl *) malloc(sizeof(struct acl), M_80211_ACL, M_NOWAIT | M_ZERO);
  179         if (new == NULL) {
  180                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
  181                         "ACL: add %s failed, no memory\n", ether_sprintf(mac));
  182                 /* XXX statistic */
  183                 return ENOMEM;
  184         }
  185 
  186         ACL_LOCK(as);
  187         hash = ACL_HASH(mac);
  188         LIST_FOREACH(acl, &as->as_hash[hash], acl_hash) {
  189                 if (IEEE80211_ADDR_EQ(acl->acl_macaddr, mac)) {
  190                         ACL_UNLOCK(as);
  191                         free(new, M_80211_ACL);
  192                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
  193                                 "ACL: add %s failed, already present\n",
  194                                 ether_sprintf(mac));
  195                         return EEXIST;
  196                 }
  197         }
  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);
  201         as->as_nacls++;
  202         ACL_UNLOCK(as);
  203 
  204         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
  205                 "ACL: add %s\n", ether_sprintf(mac));
  206         return 0;
  207 }
  208 
  209 static int
  210 acl_remove(struct ieee80211vap *vap, const uint8_t mac[IEEE80211_ADDR_LEN])
  211 {
  212         struct aclstate *as = vap->iv_as;
  213         struct acl *acl;
  214 
  215         ACL_LOCK(as);
  216         acl = _find_acl(as, mac);
  217         if (acl != NULL)
  218                 _acl_free(as, acl);
  219         ACL_UNLOCK(as);
  220 
  221         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
  222                 "ACL: remove %s%s\n", ether_sprintf(mac),
  223                 acl == NULL ? ", not present" : "");
  224 
  225         return (acl == NULL ? ENOENT : 0);
  226 }
  227 
  228 static int
  229 acl_free_all(struct ieee80211vap *vap)
  230 {
  231         struct aclstate *as = vap->iv_as;
  232         struct acl *acl;
  233 
  234         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all");
  235 
  236         ACL_LOCK(as);
  237         while ((acl = TAILQ_FIRST(&as->as_list)) != NULL)
  238                 _acl_free(as, acl);
  239         ACL_UNLOCK(as);
  240 
  241         return 0;
  242 }
  243 
  244 static int
  245 acl_setpolicy(struct ieee80211vap *vap, int policy)
  246 {
  247         struct aclstate *as = vap->iv_as;
  248 
  249         IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL,
  250                 "ACL: set policy to %u\n", policy);
  251 
  252         switch (policy) {
  253         case IEEE80211_MACCMD_POLICY_OPEN:
  254                 as->as_policy = ACL_POLICY_OPEN;
  255                 break;
  256         case IEEE80211_MACCMD_POLICY_ALLOW:
  257                 as->as_policy = ACL_POLICY_ALLOW;
  258                 break;
  259         case IEEE80211_MACCMD_POLICY_DENY:
  260                 as->as_policy = ACL_POLICY_DENY;
  261                 break;
  262         case IEEE80211_MACCMD_POLICY_RADIUS:
  263                 as->as_policy = ACL_POLICY_RADIUS;
  264                 break;
  265         default:
  266                 return EINVAL;
  267         }
  268         return 0;
  269 }
  270 
  271 static int
  272 acl_getpolicy(struct ieee80211vap *vap)
  273 {
  274         struct aclstate *as = vap->iv_as;
  275 
  276         return as->as_policy;
  277 }
  278 
  279 static int
  280 acl_setioctl(struct ieee80211vap *vap, struct ieee80211req *ireq)
  281 {
  282 
  283         return EINVAL;
  284 }
  285 
  286 static int
  287 acl_getioctl(struct ieee80211vap *vap, struct ieee80211req *ireq)
  288 {
  289         struct aclstate *as = vap->iv_as;
  290         struct acl *acl;
  291         struct ieee80211req_maclist *ap;
  292         int error;
  293         uint32_t i, space;
  294 
  295         switch (ireq->i_val) {
  296         case IEEE80211_MACCMD_POLICY:
  297                 ireq->i_val = as->as_policy;
  298                 return 0;
  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 */
  304                 }
  305                 ap = (struct ieee80211req_maclist *) malloc(space,
  306                     M_TEMP, M_NOWAIT);
  307                 if (ap == NULL)
  308                         return ENOMEM;
  309                 i = 0;
  310                 ACL_LOCK(as);
  311                 TAILQ_FOREACH(acl, &as->as_list, acl_list) {
  312                         IEEE80211_ADDR_COPY(ap[i].ml_macaddr, acl->acl_macaddr);
  313                         i++;
  314                 }
  315                 ACL_UNLOCK(as);
  316                 if (ireq->i_len >= space) {
  317                         error = copyout(ap, ireq->i_data, space);
  318                         ireq->i_len = space;
  319                 } else
  320                         error = copyout(ap, ireq->i_data, ireq->i_len);
  321                 free(ap, M_TEMP);
  322                 return error;
  323         }
  324         return EINVAL;
  325 }
  326 
  327 static const struct ieee80211_aclator mac = {
  328         .iac_name       = "mac",
  329         .iac_attach     = acl_attach,
  330         .iac_detach     = acl_detach,
  331         .iac_check      = acl_check,
  332         .iac_add        = acl_add,
  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,
  339 };
  340 IEEE80211_ACL_MODULE(wlan_acl, mac, 1);

Cache object: 1abe4fe3de205875ba4325bc932215d0


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