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mac80211: 802.11w - SA Query processing 

Process SA Query Requests for client mode in mac80211. AP side
processing of SA Query Response frames is in user space (hostapd).

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 13:32:06 +02:00 committed by John W. Linville
parent fdfacf0ae2
commit fea1473289
2 changed files with 83 additions and 0 deletions
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14
include/linux/ieee80211.h
View File

@ -527,6 +527,8 @@ struct ieee80211_tim_ie {
u8 virtual_map[0];
} __attribute__ ((packed));
#define WLAN_SA_QUERY_TR_ID_LEN 16
struct ieee80211_mgmt {
__le16 frame_control;
__le16 duration;
@ -646,6 +648,10 @@ struct ieee80211_mgmt {
u8 action_code;
u8 variable[0];
} __attribute__((packed)) mesh_action;
struct {
u8 action;
u8 trans_id[WLAN_SA_QUERY_TR_ID_LEN];
} __attribute__ ((packed)) sa_query;
} u;
} __attribute__ ((packed)) action;
} u;
@ -1041,6 +1047,7 @@ enum ieee80211_category {
WLAN_CATEGORY_DLS = 2,
WLAN_CATEGORY_BACK = 3,
WLAN_CATEGORY_PUBLIC = 4,
WLAN_CATEGORY_SA_QUERY = 8,
WLAN_CATEGORY_WMM = 17,
};
@ -1129,6 +1136,13 @@ enum ieee80211_back_parties {
WLAN_BACK_TIMER = 2,
};
/* SA Query action */
enum ieee80211_sa_query_action {
WLAN_ACTION_SA_QUERY_REQUEST = 0,
WLAN_ACTION_SA_QUERY_RESPONSE = 1,
};
/* A-MSDU 802.11n */
#define IEEE80211_QOS_CONTROL_A_MSDU_PRESENT 0x0080

69
net/mac80211/rx.c
View File

@ -1667,6 +1667,57 @@ ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx)
return RX_CONTINUE;
}
void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata,
struct ieee80211_mgmt *mgmt,
size_t len)
{
struct ieee80211_local *local = sdata->local;
struct sk_buff *skb;
struct ieee80211_mgmt *resp;
if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) {
/* Not to own unicast address */
return;
}
if (compare_ether_addr(mgmt->sa, sdata->u.sta.bssid) != 0 ||
compare_ether_addr(mgmt->bssid, sdata->u.sta.bssid) != 0) {
/* Not from the current AP. */
return;
}
if (sdata->u.sta.state == IEEE80211_STA_MLME_ASSOCIATE) {
/* Association in progress; ignore SA Query */
return;
}
if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) {
/* Too short SA Query request frame */
return;
}
skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom);
if (skb == NULL)
return;
skb_reserve(skb, local->hw.extra_tx_headroom);
resp = (struct ieee80211_mgmt *) skb_put(skb, 24);
memset(resp, 0, 24);
memcpy(resp->da, mgmt->sa, ETH_ALEN);
memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN);
memcpy(resp->bssid, sdata->u.sta.bssid, ETH_ALEN);
resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
IEEE80211_STYPE_ACTION);
skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query));
resp->u.action.category = WLAN_CATEGORY_SA_QUERY;
resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE;
memcpy(resp->u.action.u.sa_query.trans_id,
mgmt->u.action.u.sa_query.trans_id,
WLAN_SA_QUERY_TR_ID_LEN);
ieee80211_tx_skb(sdata, skb, 1);
}
static ieee80211_rx_result debug_noinline
ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
{
@ -1743,6 +1794,24 @@ ieee80211_rx_h_action(struct ieee80211_rx_data *rx)
break;
}
break;
case WLAN_CATEGORY_SA_QUERY:
if (len < (IEEE80211_MIN_ACTION_SIZE +
sizeof(mgmt->u.action.u.sa_query)))
return RX_DROP_MONITOR;
switch (mgmt->u.action.u.sa_query.action) {
case WLAN_ACTION_SA_QUERY_REQUEST:
if (sdata->vif.type != NL80211_IFTYPE_STATION)
return RX_DROP_MONITOR;
ieee80211_process_sa_query_req(sdata, mgmt, len);
break;
case WLAN_ACTION_SA_QUERY_RESPONSE:
/*
* SA Query response is currently only used in AP mode
* and it is processed in user space.
*/
return RX_CONTINUE;
}
break;
default:
return RX_CONTINUE;
}