| /*- |
| * 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. |
| * |
| * $Id: ieee80211_acl.c 1721 2006-09-20 08:45:13Z mentor $ |
| */ |
| #ifndef EXPORT_SYMTAB |
| #define EXPORT_SYMTAB |
| #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_DENY). |
| */ |
| #ifndef AUTOCONF_INCLUDED |
| #include <linux/config.h> |
| #endif |
| #include <linux/version.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/netdevice.h> |
| #include <linux/init.h> |
| |
| #include "net80211/if_media.h" |
| |
| #include "net80211/ieee80211_var.h" |
| |
| enum { |
| ACL_POLICY_OPEN = 0, /* open, don't check ACLs */ |
| 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; |
| TAILQ_HEAD(, acl) as_list; /* list of all ACLs */ |
| ATH_LIST_HEAD(, acl) as_hash[ACL_HASHSIZE]; |
| }; |
| |
| /* 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 void acl_free_all_locked(struct aclstate *); |
| |
| static int |
| acl_attach(struct ieee80211vap *vap) |
| { |
| struct aclstate *as; |
| |
| _MOD_INC_USE(THIS_MODULE, return 0); |
| |
| MALLOC(as, struct aclstate *, sizeof(struct aclstate), |
| M_DEVBUF, M_NOWAIT | M_ZERO); |
| if (as == NULL) { |
| _MOD_DEC_USE(THIS_MODULE); |
| return 0; |
| } |
| ACL_LOCK_INIT(as, "acl"); |
| TAILQ_INIT(&as->as_list); |
| as->as_policy = ACL_POLICY_OPEN; |
| vap->iv_as = as; |
| return 1; |
| } |
| |
| static void |
| acl_detach(struct ieee80211vap *vap) |
| { |
| struct aclstate *as = vap->iv_as; |
| |
| if (as == NULL) |
| return; |
| |
| ACL_LOCK(as); |
| acl_free_all_locked(as); |
| ACL_UNLOCK(as); |
| vap->iv_as = NULL; |
| ACL_LOCK_DESTROY(as); |
| FREE(as, M_DEVBUF); |
| |
| _MOD_DEC_USE(THIS_MODULE); |
| } |
| |
| 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) |
| { |
| |
| TAILQ_REMOVE(&as->as_list, acl, acl_list); |
| LIST_REMOVE(acl, acl_hash); |
| FREE(acl, M_80211_ACL); |
| } |
| |
| static int |
| acl_check(struct ieee80211vap *vap, const u_int8_t mac[IEEE80211_ADDR_LEN]) |
| { |
| struct aclstate *as = vap->iv_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 ieee80211vap *vap, const u_int8_t mac[IEEE80211_ADDR_LEN]) |
| { |
| struct aclstate *as = vap->iv_as; |
| struct acl *acl, *new; |
| int hash; |
| |
| MALLOC(new, struct acl *, sizeof(struct acl), M_80211_ACL, M_NOWAIT | M_ZERO); |
| if (new == NULL) { |
| IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, |
| "ACL: add %s failed, no memory\n", ether_sprintf(mac)); |
| /* XXX statistic */ |
| return -ENOMEM; |
| } |
| |
| 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(vap, 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); |
| ACL_UNLOCK(as); |
| |
| IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, |
| "ACL: add %s\n", ether_sprintf(mac)); |
| |
| return 0; |
| } |
| |
| static int |
| acl_remove(struct ieee80211vap *vap, const u_int8_t mac[IEEE80211_ADDR_LEN]) |
| { |
| struct aclstate *as = vap->iv_as; |
| struct acl *acl; |
| |
| ACL_LOCK(as); |
| acl = _find_acl(as, mac); |
| if (acl != NULL) |
| _acl_free(as, acl); |
| ACL_UNLOCK(as); |
| |
| IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, |
| "ACL: remove %s%s\n", ether_sprintf(mac), |
| acl == NULL ? ", not present" : ""); |
| |
| return (acl == NULL ? ENOENT : 0); |
| } |
| |
| static void |
| acl_free_all_locked(struct aclstate *as) |
| { |
| struct acl *acl; |
| |
| ACL_LOCK_ASSERT(as); |
| |
| while ((acl = TAILQ_FIRST(&as->as_list)) != NULL) |
| _acl_free(as, acl); |
| } |
| |
| static int |
| acl_free_all(struct ieee80211vap *vap) |
| { |
| struct aclstate *as = vap->iv_as; |
| |
| IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, "ACL: %s\n", "free all"); |
| |
| ACL_LOCK(as); |
| acl_free_all_locked(vap->iv_as); |
| ACL_UNLOCK(as); |
| |
| return 0; |
| } |
| |
| static int |
| acl_add_mac_list(struct ieee80211vap *vap, int num_macs, struct ieee80211_mac_addr *mac_list) |
| { |
| int i = 0; |
| int ret = 0; |
| |
| while (i < num_macs) { |
| ret = acl_add(vap, mac_list[i].addr); |
| if (ret < 0 && ret != -EEXIST) |
| return ret; |
| i++; |
| } |
| |
| return ret; |
| } |
| |
| static int |
| acl_setpolicy(struct ieee80211vap *vap, int policy) |
| { |
| struct aclstate *as = vap->iv_as; |
| |
| IEEE80211_DPRINTF(vap, IEEE80211_MSG_ACL, |
| "ACL: set policy to %u\n", policy); |
| |
| switch (policy) { |
| case IEEE80211_MACCMD_POLICY_OPEN: |
| as->as_policy = ACL_POLICY_OPEN; |
| /* Flush silently to reset */ |
| acl_free_all(vap); |
| 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 ieee80211vap *vap) |
| { |
| struct aclstate *as = vap->iv_as; |
| |
| return as->as_policy; |
| } |
| |
| /* |
| * Module glue. |
| */ |
| |
| MODULE_AUTHOR("Errno Consulting, Sam Leffler"); |
| MODULE_DESCRIPTION("802.11 wireless support: MAC-based ACL policy"); |
| #ifdef MODULE_LICENSE |
| MODULE_LICENSE("Dual BSD/GPL"); |
| #endif |
| |
| 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_add_mac_list = acl_add_mac_list, |
| }; |
| |
| static int __init |
| init_ieee80211_acl(void) |
| { |
| ieee80211_aclator_register(&mac); |
| return 0; |
| } |
| module_init(init_ieee80211_acl); |
| |
| static void __exit |
| exit_ieee80211_acl(void) |
| { |
| ieee80211_aclator_unregister(&mac); |
| } |
| module_exit(exit_ieee80211_acl); |