This patch enables drivers to implement mac address based
access control in AP/P2P GO mode. Capable driver advertises
this capability by setting wiphy max_acl_mac_addrs.
Driver can enable its ACL either with the initial list passed
through NL80211_CMD_START_AP or a list passed through
NL80211_CMD_SET_MAC_ACL. ACL information passed in these
commands is an array of acl configuration each containing acl
policy and list of mac address. With the acl policy as
NL80211_ACL_POLICY_ACCEPT, driver will accept Auth requesti from any
client matching any one of the mac addresses in the acl list. When
acl policy is NL80211_ACL_POLICY_DENY, driver will ignore the connection
request from the client. When a client is not part of either of the lists
when both (black & white) are configured there will be a notification
through NL80211_CMD_CONN_FAILED with failed reason as
NL80211_CONN_FAIL_NEITHER_BLACK_WHITE_CLIENT. Driver must make sure to
clear it's acl list when doing stop ap.
Signed-off-by: Vasanthakumar Thiagarajan <vthiagar@xxxxxxxxxxxxxxxx>
---
include/net/cfg80211.h | 48 +++++++++++
include/uapi/linux/nl80211.h | 68 ++++++++++++++-
net/wireless/core.c | 5 +
net/wireless/nl80211.c | 192 +++++++++++++++++++++++++++++++++++++++++-
4 files changed, 309 insertions(+), 4 deletions(-)
diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index 9273d05..f5a37c7 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -526,6 +526,31 @@ struct mac_address {
};
/**
+ * struct cfg80211_acl_data - Access control data
+ * @acl_policy: Access control policy to be applied on the station's
+ entry specified by mac_addr
+ * @n_acl_entries: Number of mac address entries passed
+ * @mac_addrs: List of mac addresses of stations to be used for acl
+ */
+struct cfg80211_acl_data {
+ enum nl80211_acl_policy_attr acl_policy;
+ int n_acl_entries;
+
+ /* Keep it last */
+ struct mac_address mac_addrs[];
+};
+
+/**
+ * struct cfg80211_acl_settings - Access control configuration
+ * @acl_data: Acl data for various acl policies
+ * @mac_acl_list: Number of acl configurations
+ */
+struct cfg80211_acl_settings {
+ struct cfg80211_acl_data *acl_data[NL80211_ACL_POLICY_MAX + 1];
+ int num_acl_list;
+};
+
+/**
* struct cfg80211_ap_settings - AP configuration
*
* Used to configure an AP interface.
@@ -544,6 +569,8 @@ struct mac_address {
* @inactivity_timeout: time in seconds to determine station's inactivity.
* @p2p_ctwindow: P2P CT Window
* @p2p_opp_ps: P2P opportunistic PS
+ * @acl: acl configuration used by the drivers which has support for
+ * mac address based access control
*/
struct cfg80211_ap_settings {
struct cfg80211_chan_def chandef;
@@ -560,6 +587,7 @@ struct cfg80211_ap_settings {
int inactivity_timeout;
u8 p2p_ctwindow;
bool p2p_opp_ps;
+ struct cfg80211_acl_settings acl;
};
/**
@@ -1767,6 +1795,16 @@ struct cfg80211_gtk_rekey_data {
*
* @start_p2p_device: Start the given P2P device.
* @stop_p2p_device: Stop the given P2P device.
+ *
+ * @set_mac_acl: Set stations' mac address to driver's access control list in
+ * AP and P2P GO mode. Parameters contains an array of acl configuration
+ * each containing the acl policy, list of mac addresses and the number
+ * of mac address entries, and number of array entries. If there is already
+ * a list in driver for one of the acl policies, this new list replaces the
+ * existing one for that corresponding acl policy. Driver has to clear a
+ * particular acl list when number of mac address entries is passed as 0
+ * for that acl policy. Drivers which advertise the support for mac address
+ * based access control have to implement this callback.
*/
struct cfg80211_ops {
int (*suspend)(struct wiphy *wiphy, struct cfg80211_wowlan *wow);
@@ -1987,6 +2025,9 @@ struct cfg80211_ops {
struct wireless_dev *wdev);
void (*stop_p2p_device)(struct wiphy *wiphy,
struct wireless_dev *wdev);
+
+ int (*set_mac_acl)(struct wiphy *wiphy, struct net_device *dev,
+ struct cfg80211_acl_settings *params);
};
/*
@@ -2290,6 +2331,11 @@ struct wiphy_wowlan_support {
* @ap_sme_capa: AP SME capabilities, flags from &enum nl80211_ap_sme_features.
* @ht_capa_mod_mask: Specify what ht_cap values can be over-ridden.
* If null, then none can be over-ridden.
+ *
+ * @max_acl_mac_addrs: Maximum number of mac addresses that the device
+ * supports for ACL. Driver having ACL based on MAC address support
+ * has to fill this. This limit is common for both (white & black)
+ * the lists.
*/
struct wiphy {
/* assign these fields before you register the wiphy */
@@ -2392,6 +2438,8 @@ struct wiphy {
const struct iw_handler_def *wext;
#endif
+ u16 max_acl_mac_addrs;
+
char priv[0] __attribute__((__aligned__(NETDEV_ALIGN)));
};
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index e3e19f8..d6f5e55 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -170,7 +170,8 @@
* %NL80211_ATTR_HIDDEN_SSID, %NL80211_ATTR_CIPHERS_PAIRWISE,
* %NL80211_ATTR_CIPHER_GROUP, %NL80211_ATTR_WPA_VERSIONS,
* %NL80211_ATTR_AKM_SUITES, %NL80211_ATTR_PRIVACY,
- * %NL80211_ATTR_AUTH_TYPE and %NL80211_ATTR_INACTIVITY_TIMEOUT.
+ * %NL80211_ATTR_AUTH_TYPE, %NL80211_ATTR_INACTIVITY_TIMEOUT and
+ * %NL80211_ATTR_MAC_ACL_LISTS.
* The channel to use can be set on the interface or be given using the
* %NL80211_ATTR_WIPHY_FREQ and the attributes determining channel width.
* @NL80211_CMD_NEW_BEACON: old alias for %NL80211_CMD_START_AP
@@ -586,6 +587,16 @@
* @NL80211_CMD_SET_MCAST_RATE: Change the rate used to send multicast frames
* for IBSS or MESH vif.
*
+ * @NL80211_CMD_SET_MAC_ACL: sets acl list for mac address based access control.
+ * This is to be used with the drivers advertising the support of mac
+ * address based access control. ACL information is passed in
+ * %NL80211_ATTR_MAC_ACL_LISTS. Driver will enable it's ACL with this
+ * list, if it is not done already. New acl list for an acl policy
+ * will replace the eixsting one. When a passed list of mac address
+ * is empty for a particular acl policy, driver has to clear corresponding
+ * acl list. This command is used in AP/P2P GO mode. Driver has to make
+ * sure to clear it's acl list during %NL80211_CMD_STOP_AP.
+ *
* @NL80211_CMD_MAX: highest used command number
* @__NL80211_CMD_AFTER_LAST: internal use
*/
@@ -736,6 +747,8 @@ enum nl80211_commands {
NL80211_CMD_SET_MCAST_RATE,
+ NL80211_CMD_SET_MAC_ACL,
+
/* add new commands above here */
/* used to define NL80211_CMD_MAX below */
@@ -1310,6 +1323,12 @@ enum nl80211_commands {
* if not given in START_AP 0 is assumed, if not given in SET_BSS
* no change is made.
*
+ * @NL80211_ATTR_MAC_ACL_LISTS: Nested attribute containing acl configuration,
+ * see enum nl80211_acl_info_attr.
+ * @NL80211_ATTR_MAC_ACL_MAX: u32 attribute to advertise the maximum
+ * number of mac addresses that a device can support for MAC
+ * access control.
+ *
* @NL80211_ATTR_MAX: highest attribute number currently defined
* @__NL80211_ATTR_AFTER_LAST: internal use
*/
@@ -1580,6 +1599,9 @@ enum nl80211_attrs {
NL80211_ATTR_P2P_CTWINDOW,
NL80211_ATTR_P2P_OPPPS,
+ NL80211_ATTR_MAC_ACL_LISTS,
+ NL80211_ATTR_MAC_ACL_MAX,
+
/* add attributes here, update the policy in nl80211.c */
__NL80211_ATTR_AFTER_LAST,
@@ -3182,11 +3204,13 @@ enum nl80211_probe_resp_offload_support_attr {
* enum nl80211_connect_failed_reason - connection request failed reasons
* @NL80211_CONN_FAIL_MAX_CLIENTS: Maximum number of clients that can be
* handled by the AP is reached.
- * @NL80211_CONN_FAIL_BLOCKED_CLIENT: Client's MAC is in the AP's blocklist.
+ * @NL80211_CONN_FAIL_NEITHER_BLACK_WHITE_CLIENT: Client's mac address is part
+ * of neither of the lists. This should be notified only when both the
+ * lists (black & white) are configured in the driver.
*/
enum nl80211_connect_failed_reason {
NL80211_CONN_FAIL_MAX_CLIENTS,
- NL80211_CONN_FAIL_BLOCKED_CLIENT,
+ NL80211_CONN_FAIL_NEITHER_BLACK_WHITE_CLIENT,
};
/**
@@ -3210,4 +3234,42 @@ enum nl80211_scan_flags {
NL80211_SCAN_FLAG_AP = 1<<2,
};
+/**
+ * enum nl80211_acl_info_attr - Access control information attributes
+ *
+ * @__NL80211_ACL_ATTR_INVALID: Invalid number for nested attributes
+ * @NL80211_ACL_ATTR_POLICY: Access control policy to be applied on the
+ mac address list, see enum nl80211_acl_policy_attr.
+ * @NL80211_ACL_ATTR_MAC_ADDRS: List of stations' mac addresses for ACL
+ * @__NL80211_ACL_ATTR_AFTER_LAST: Internal
+ * @NL80211_ACL_ATTR_MAX: Highest number of acl attributes
+ */
+enum nl80211_acl_info_attr {
+ __NL80211_ACL_ATTR_INVALID,
+ NL80211_ACL_ATTR_POLICY,
+ NL80211_ACL_ATTR_MAC_ADDRS,
+
+ __NL80211_ACL_ATTR_AFTER_LAST,
+ NL80211_ACL_ATTR_MAX = __NL80211_ACL_ATTR_AFTER_LAST - 1
+};
+
+/**
+ * enum nl80211_acl_policy_attr - The access control policy which needs to be
+ * applied on a mac list set by %NL80211_CMD_START_AP and
+ * %NL80211_CMD_SET_MAC_ACL. To be used with %NL80211_ACL_ATTR_POLICY.
+ *
+ * @NL80211_ACL_POLICY_ACCEPT: Allow the station to authenticate
+ * @NL80211_ACL_POLICY_DENY: Block the station from authentication
+ * @__NL80211_ACL_POLICY_AFTER_LAST: Internal use
+ * @NL80211_ACL_POLICY_MAX: Highest acl policy attribute
+ */
+enum nl80211_acl_policy_attr {
+ NL80211_ACL_POLICY_ACCEPT,
+ NL80211_ACL_POLICY_DENY,
+
+ /* Keep last */
+ __NL80211_ACL_POLICY_AFTER_LAST,
+ NL80211_ACL_POLICY_MAX = __NL80211_ACL_POLICY_AFTER_LAST - 1
+};
+
#endif /* __LINUX_NL80211_H */
diff --git a/net/wireless/core.c b/net/wireless/core.c
index 14d9904..e5b37eb 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -478,6 +478,11 @@ int wiphy_register(struct wiphy *wiphy)
ETH_ALEN)))
return -EINVAL;
+ if (WARN_ON(wiphy->max_acl_mac_addrs &&
+ (!(wiphy->flags & WIPHY_FLAG_HAVE_AP_SME) ||
+ !rdev->ops->set_mac_acl)))
+ return -EINVAL;
+
if (wiphy->addresses)
memcpy(wiphy->perm_addr, wiphy->addresses[0].addr, ETH_ALEN);
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index f45706a..fcaa5d4 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -365,6 +365,7 @@ static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
[NL80211_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
[NL80211_ATTR_P2P_CTWINDOW] = { .type = NLA_U8 },
[NL80211_ATTR_P2P_OPPPS] = { .type = NLA_U8 },
+ [NL80211_ATTR_MAC_ACL_LISTS] = { .type = NLA_NESTED },
};
/* policy for the key attributes */
@@ -1265,6 +1266,11 @@ static int nl80211_send_wiphy(struct sk_buff *msg, u32 portid, u32 seq, int flag
dev->wiphy.ht_capa_mod_mask))
goto nla_put_failure;
+ if ((dev->wiphy.flags & WIPHY_FLAG_HAVE_AP_SME) &&
+ nla_put_u32(msg, NL80211_ATTR_MAC_ACL_MAX,
+ dev->wiphy.max_acl_mac_addrs))
+ goto nla_put_failure;
+
return genlmsg_end(msg, hdr);
nla_put_failure:
@@ -2481,6 +2487,167 @@ static int nl80211_del_key(struct sk_buff *skb, struct genl_info *info)
return err;
}
+/*
+ * This function must either return an error or the number
+ * of nested attributes.
+ */
+static int validate_acl_mac_addrs(struct nlattr *nl_attr)
+{
+ struct nlattr *attr;
+ int n_entries = 0, tmp;
+
+ nla_for_each_nested(attr, nl_attr, tmp) {
+ if (nla_len(attr) != ETH_ALEN)
+ return -EINVAL;
+
+ if (!is_valid_ether_addr(nla_data(attr)))
+ return -EINVAL;
+
+ n_entries++;
+ }
+
+ return n_entries;
+}
+
+static const struct nla_policy mac_acl_policy[NL80211_ACL_ATTR_MAX + 1] = {
+ [NL80211_ACL_ATTR_POLICY] = { .type = NLA_U8 },
+ [NL80211_ACL_ATTR_MAC_ADDRS] = { .type = NLA_NESTED },
+};
+
+/*
+ * This function parses acl information and fills the configuration.
+ * On a successful return, the caller function is responsible to
+ * free up the memory allocated in this function for acl configuration.
+ */
+static int parse_acl_information(struct cfg80211_registered_device *rdev,
+ struct nlattr *acl_attr,
+ struct cfg80211_acl_settings *acl)
+{
+ struct nlattr *nla_acl, *attr, *tb[NL80211_ACL_ATTR_MAX + 1];
+ u8 avail_acl[NL80211_ACL_POLICY_MAX + 1];
+ int tmp_acl, tmp, i = 0, j, n_entries, n_acl = 0;
+ int acl_policy, err;
+
+ memset(avail_acl, 0, sizeof(avail_acl));
+ nla_for_each_nested(nla_acl, acl_attr, tmp_acl) {
+ if (n_acl > NL80211_ACL_POLICY_MAX) {
+ err = -EINVAL;
+ goto free_acl;
+ }
+
+ if (nla_parse_nested(tb, NL80211_ACL_ATTR_MAX, nla_acl,
+ mac_acl_policy)) {
+ err = -EINVAL;
+ goto free_acl;
+ }
+
+ if (!tb[NL80211_ACL_ATTR_POLICY]) {
+ err = -EINVAL;
+ goto free_acl;
+ }
+
+ acl_policy = nla_get_u8(tb[NL80211_ACL_ATTR_POLICY]);
+ if (acl_policy > NL80211_ACL_POLICY_MAX ||
+ avail_acl[acl_policy]) {
+ err = -EINVAL;
+ goto free_acl;
+ }
+
+ if (!tb[NL80211_ACL_ATTR_MAC_ADDRS]) {
+ err = -EINVAL;
+ goto free_acl;
+ }
+
+ n_entries =
+ validate_acl_mac_addrs(tb[NL80211_ACL_ATTR_MAC_ADDRS]);
+ if (n_entries < 0) {
+ err = n_entries;
+ goto free_acl;
+ }
+
+ if (n_entries > rdev->wiphy.max_acl_mac_addrs) {
+ err = -EOPNOTSUPP;
+ goto free_acl;
+ }
+
+ acl->acl_data[n_acl] =
+ kzalloc(sizeof(struct cfg80211_acl_data) +
+ (n_entries * sizeof(struct mac_address)),
+ GFP_KERNEL);
+ if (!acl->acl_data[n_acl]) {
+ err = -ENOMEM;
+ goto free_acl;
+ }
+
+ j = 0;
+ nla_for_each_nested(attr, tb[NL80211_ACL_ATTR_MAC_ADDRS], tmp) {
+ memcpy(acl->acl_data[n_acl]->mac_addrs[j].addr,
+ nla_data(attr), ETH_ALEN);
+ j++;
+ }
+
+ acl->acl_data[n_acl]->n_acl_entries = j;
+ acl->acl_data[n_acl]->acl_policy = acl_policy;
+ avail_acl[acl_policy] = 1;
+ n_acl++;
+ }
+
+ if (!n_acl)
+ return -EINVAL;
+
+ acl->num_acl_list = n_acl;
+
+ return 0;
+
+free_acl:
+ for (i = 0; i < n_acl; i++)
+ kfree(acl->acl_data[i]);
+
+ return err;
+}
+
+static int nl80211_set_mac_acl(struct sk_buff *skb, struct genl_info *info)
+{
+ struct cfg80211_registered_device *rdev = info->user_ptr[0];
+ struct net_device *dev = info->user_ptr[1];
+ struct cfg80211_acl_settings acl;
+ int err, i;
+
+ if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
+ dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
+ return -EOPNOTSUPP;
+
+ if (!dev->ieee80211_ptr->beacon_interval)
+ return -EINVAL;
+
+ if (!rdev->wiphy.max_acl_mac_addrs)
+ return -EOPNOTSUPP;
+
+ if (!info->attrs[NL80211_ATTR_MAC_ACL_LISTS])
+ return -EINVAL;
+
+ memset(&acl, 0, sizeof(acl));
+
+ err = parse_acl_information(rdev,
+ info->attrs[NL80211_ATTR_MAC_ACL_LISTS],
+ &acl);
+ if (err)
+ return err;
+
+ if (!rdev->ops->set_mac_acl) {
+ err = -EOPNOTSUPP;
+ goto out_free;
+ }
+
+ err = rdev->ops->set_mac_acl(&rdev->wiphy, dev, &acl);
+
+out_free:
+ for (i = 0; i < acl.num_acl_list; i++)
+ kfree(acl.acl_data[i]);
+
+ return err;
+}
+
static int nl80211_parse_beacon(struct genl_info *info,
struct cfg80211_beacon_data *bcn)
{
@@ -2597,7 +2764,7 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
struct net_device *dev = info->user_ptr[1];
struct wireless_dev *wdev = dev->ieee80211_ptr;
struct cfg80211_ap_settings params;
- int err;
+ int err, i;
if (dev->ieee80211_ptr->iftype != NL80211_IFTYPE_AP &&
dev->ieee80211_ptr->iftype != NL80211_IFTYPE_P2P_GO)
@@ -2724,6 +2891,17 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
if (err)
return err;
+ if (info->attrs[NL80211_ATTR_MAC_ACL_LISTS]) {
+ if (!rdev->wiphy.max_acl_mac_addrs)
+ return -EOPNOTSUPP;
+
+ err = parse_acl_information(rdev,
+ info->attrs[NL80211_ATTR_MAC_ACL_LISTS],
+ ¶ms.acl);
+ if (err)
+ return err;
+ }
+
err = rdev_start_ap(rdev, dev, ¶ms);
if (!err) {
wdev->preset_chandef = params.chandef;
@@ -2732,6 +2910,10 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
wdev->ssid_len = params.ssid_len;
memcpy(wdev->ssid, params.ssid, wdev->ssid_len);
}
+
+ for (i = 0; i < params.acl.num_acl_list; i++)
+ kfree(params.acl.acl_data[i]);
+
return err;
}
@@ -7784,6 +7966,14 @@ static struct genl_ops nl80211_ops[] = {
.internal_flags = NL80211_FLAG_NEED_NETDEV |
NL80211_FLAG_NEED_RTNL,
},
+ {
+ .cmd = NL80211_CMD_SET_MAC_ACL,
+ .doit = nl80211_set_mac_acl,
+ .policy = nl80211_policy,
+ .flags = GENL_ADMIN_PERM,
+ .internal_flags = NL80211_FLAG_NEED_NETDEV |
+ NL80211_FLAG_NEED_RTNL,
+ },
};
static struct genl_multicast_group nl80211_mlme_mcgrp = {
--
1.7.0.4
--
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