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mac80211: 802.11w - Implement Association Comeback processing

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When MFP is enabled, the AP does not allow a STA to associate if an
existing security association exists without first going through SA
Query process. When this happens, the association request is denied
with a new status code ("temporarily rejected") ans Association
Comeback IE is used to notify when the association may be tried again
(i.e., when the SA Query procedure has timed out).

Use the comeback time to update the mac80211 client MLME timer for
next association attempt to minimize waiting time if association is
temporarily rejected.

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Jouni Malinen 2009-01-08 13:32:09 +02:00 committed by John W. Linville
parent 97ebe12a03
commit 63a5ab8225
4 changed files with 27 additions and 3 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
include/linux/ieee80211.h
View file

@ -914,6 +914,9 @@ enum ieee80211_statuscode {
/* 802.11g */
WLAN_STATUS_ASSOC_DENIED_NOSHORTTIME = 25,
WLAN_STATUS_ASSOC_DENIED_NODSSSOFDM = 26,
/* 802.11w */
WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY = 30,
WLAN_STATUS_ROBUST_MGMT_FRAME_POLICY_VIOLATION = 31,
/* 802.11i */
WLAN_STATUS_INVALID_IE = 40,
WLAN_STATUS_INVALID_GROUP_CIPHER = 41,
@ -1034,6 +1037,7 @@ enum ieee80211_eid {
/* 802.11i */
WLAN_EID_RSN = 48,
WLAN_EID_MMIE = 76 /* 802.11w */,
WLAN_EID_ASSOC_COMEBACK_TIME = 77,
WLAN_EID_WPA = 221,
WLAN_EID_GENERIC = 221,
WLAN_EID_VENDOR_SPECIFIC = 221,

2
net/mac80211/ieee80211_i.h
View file

@ -820,6 +820,7 @@ struct ieee802_11_elems {
u8 *country_elem;
u8 *pwr_constr_elem;
u8 *quiet_elem; /* first quite element */
u8 *assoc_comeback;
/* length of them, respectively */
u8 ssid_len;
@ -847,6 +848,7 @@ struct ieee802_11_elems {
u8 pwr_constr_elem_len;
u8 quiet_elem_len;
u8 num_of_quiet_elem; /* can be more the one */
u8 assoc_comeback_len;
};
static inline struct ieee80211_local *hw_to_local(

20
net/mac80211/mlme.c
View file

@ -1275,6 +1275,23 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
sdata->dev->name, reassoc ? "Rea" : "A", mgmt->sa,
capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
elems.assoc_comeback && elems.assoc_comeback_len == 4) {
u32 tu, ms;
tu = get_unaligned_le32(elems.assoc_comeback);
ms = tu * 1024 / 1000;
printk(KERN_DEBUG "%s: AP rejected association temporarily; "
"comeback duration %u TU (%u ms)\n",
sdata->dev->name, tu, ms);
if (ms > IEEE80211_ASSOC_TIMEOUT)
mod_timer(&ifsta->timer,
jiffies + msecs_to_jiffies(ms));
return;
}
if (status_code != WLAN_STATUS_SUCCESS) {
printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
sdata->dev->name, status_code);
@ -1290,9 +1307,6 @@ static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
"set\n", sdata->dev->name, aid);
aid &= ~(BIT(15) | BIT(14));
pos = mgmt->u.assoc_resp.variable;
ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
if (!elems.supp_rates) {
printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
sdata->dev->name);

4
net/mac80211/util.c
View file

@ -653,6 +653,10 @@ void ieee802_11_parse_elems(u8 *start, size_t len,
elems->pwr_constr_elem = pos;
elems->pwr_constr_elem_len = elen;
break;
case WLAN_EID_ASSOC_COMEBACK_TIME:
elems->assoc_comeback = pos;
elems->assoc_comeback_len = elen;
break;
default:
break;
}