In case of re-authentication of a node, in IBSS mode, the sta_info structure
corresponding to it is first destroyed and then reinserted. In this way its
internal state is reset.
This operation is helpful in case of a node being rebooted which is joining the
ad-hoc cell again before its purge timeout on the other nodes expires.
Signed-off-by: Antonio Quartulli <ordex@xxxxxxxxxxxxx>
---
net/mac80211/ibss.c | 94 +++++++++++++++++++++++++++++++--------------------
1 files changed, 57 insertions(+), 37 deletions(-)
diff --git a/net/mac80211/ibss.c b/net/mac80211/ibss.c
index a7564e3..d80de75 100644
--- a/net/mac80211/ibss.c
+++ b/net/mac80211/ibss.c
@@ -35,32 +35,6 @@
#define IEEE80211_IBSS_MAX_STA_ENTRIES 128
-
-static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
- struct ieee80211_mgmt *mgmt,
- size_t len)
-{
- u16 auth_alg, auth_transaction;
-
- lockdep_assert_held(&sdata->u.ibss.mtx);
-
- if (len < 24 + 6)
- return;
-
- auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
- auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
-
- /*
- * IEEE 802.11 standard does not require authentication in IBSS
- * networks and most implementations do not seem to use it.
- * However, try to reply to authentication attempts if someone
- * has actually implemented this.
- */
- if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1)
- ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0, mgmt->sa,
- sdata->u.ibss.bssid, NULL, 0, 0);
-}
-
static void __ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, const int beacon_int,
struct ieee80211_channel *chan,
@@ -275,7 +249,8 @@ static void ieee80211_sta_join_ibss(struct ieee80211_sub_if_data *sdata,
cbss->tsf);
}
-static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
+static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta,
+ bool auth)
__acquires(RCU)
{
struct ieee80211_sub_if_data *sdata = sta->sdata;
@@ -289,13 +264,15 @@ static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
addr, sdata->name);
#endif
+ if (auth) {
#ifdef CONFIG_MAC80211_IBSS_DEBUG
- printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
- "(auth_transaction=1)\n", sdata->vif.addr,
- sdata->u.ibss.bssid, addr);
+ printk(KERN_DEBUG "TX Auth SA=%pM DA=%pM BSSID=%pM"
+ "(auth_transaction=1)\n", sdata->vif.addr,
+ sdata->u.ibss.bssid, addr);
#endif
- ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
- addr, sdata->u.ibss.bssid, NULL, 0, 0);
+ ieee80211_send_auth(sdata, 1, WLAN_AUTH_OPEN, NULL, 0,
+ addr, sdata->u.ibss.bssid, NULL, 0, 0);
+ }
sta_info_move_state(sta, IEEE80211_STA_AUTH);
sta_info_move_state(sta, IEEE80211_STA_ASSOC);
@@ -312,7 +289,7 @@ static struct sta_info *ieee80211_ibss_finish_sta(struct sta_info *sta)
static struct sta_info *
ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
const u8 *bssid, const u8 *addr,
- u32 supp_rates)
+ u32 supp_rates, bool auth)
__acquires(RCU)
{
struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
@@ -354,7 +331,7 @@ ieee80211_ibss_add_sta(struct ieee80211_sub_if_data *sdata,
sta->sta.supp_rates[band] = supp_rates |
ieee80211_mandatory_rates(local, band);
- return ieee80211_ibss_finish_sta(sta);
+ return ieee80211_ibss_finish_sta(sta, auth);
}
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
@@ -419,7 +396,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
} else {
rcu_read_unlock();
sta = ieee80211_ibss_add_sta(sdata, mgmt->bssid,
- mgmt->sa, supp_rates);
+ mgmt->sa, supp_rates, true);
}
}
@@ -547,7 +524,7 @@ static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
ieee80211_sta_join_ibss(sdata, bss);
supp_rates = ieee80211_sta_get_rates(local, elems, band);
ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa,
- supp_rates);
+ supp_rates, true);
rcu_read_unlock();
}
@@ -784,6 +761,49 @@ static void ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata)
}
}
+static void ieee80211_rx_mgmt_auth_ibss(struct ieee80211_sub_if_data *sdata,
+ struct ieee80211_mgmt *mgmt,
+ size_t len)
+{
+ u16 auth_alg, auth_transaction;
+ size_t baselen;
+
+ lockdep_assert_held(&sdata->u.ibss.mtx);
+
+ if (len < 24 + 6)
+ return;
+
+ baselen = (u8 *) mgmt->u.auth.variable - (u8 *) mgmt;
+ if (baselen > len)
+ return;
+
+ auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
+ auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
+
+ if (auth_alg == WLAN_AUTH_OPEN && auth_transaction == 1) {
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+ printk(KERN_DEBUG "%s: RX Auth SA=%pM DA=%pM BSSID=%pM."
+ "(auth_transaction=%d)\n",
+ sdata->name, mgmt->sa, mgmt->da, mgmt->bssid,
+ auth_transaction);
+#endif
+ if (sta_info_destroy_addr(sdata, mgmt->sa) != -ENOENT) {
+ ieee80211_ibss_add_sta(sdata, mgmt->bssid, mgmt->sa, 0,
+ false);
+ rcu_read_unlock();
+ }
+
+ /*
+ * IEEE 802.11 standard does not require authentication in IBSS
+ * networks and most implementations do not seem to use it.
+ * However, try to reply to authentication attempts if someone
+ * has actually implemented this.
+ */
+ ieee80211_send_auth(sdata, 2, WLAN_AUTH_OPEN, NULL, 0,
+ mgmt->sa, sdata->u.ibss.bssid, NULL, 0, 0);
+ }
+}
+
static void ieee80211_rx_mgmt_probe_req(struct ieee80211_sub_if_data *sdata,
struct sk_buff *req)
{
@@ -952,7 +972,7 @@ void ieee80211_ibss_work(struct ieee80211_sub_if_data *sdata)
list_del(&sta->list);
spin_unlock_bh(&ifibss->incomplete_lock);
- ieee80211_ibss_finish_sta(sta);
+ ieee80211_ibss_finish_sta(sta, true);
rcu_read_unlock();
spin_lock_bh(&ifibss->incomplete_lock);
}
--
1.7.3.4
--
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