diff options
| author | Felix Fietkau <nbd@openwrt.org> | 2010-01-08 20:06:26 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-01-12 22:02:06 +0300 |
| commit | d524215f6cad245249df8def19125ae6fd0bcc9b (patch) | |
| tree | 4ddbf4b50005a41a8ac69e2d156a78edd47f457d /net/mac80211/mlme.c | |
| parent | 199afd9d89b18e8b530734ed73788518e19bed9b (diff) | |
| download | linux-d524215f6cad245249df8def19125ae6fd0bcc9b.tar.xz | |
mac80211: use nullfunc frames for 4-addr sta detection
To detect incoming 4-addr stations, hostapd needs to receive a 4-addr
data frame from the remote station, so that it can create the AP VLAN
for it. With this patch, the mlme code emits a 4-addr nullfunc frame
immediately after assoc. On the AP side it also drops 4-addr nullfunc
frames to the cooked monitor mode interface, if the interface hasn't
been fully set up to receive 4-addr data frames yet.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/mlme.c')
| -rw-r--r-- | net/mac80211/mlme.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 5484cf930a87..0336dbb45ac5 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -282,6 +282,38 @@ void ieee80211_send_nullfunc(struct ieee80211_local *local, ieee80211_tx_skb(sdata, skb); } +static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local, + struct ieee80211_sub_if_data *sdata) +{ + struct sk_buff *skb; + struct ieee80211_hdr *nullfunc; + __le16 fc; + + if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION)) + return; + + skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30); + if (!skb) { + printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr " + "nullfunc frame\n", sdata->name); + return; + } + skb_reserve(skb, local->hw.extra_tx_headroom); + + nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30); + memset(nullfunc, 0, 30); + fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC | + IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS); + nullfunc->frame_control = fc; + memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN); + memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); + memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN); + memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN); + + IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT; + ieee80211_tx_skb(sdata, skb); +} + /* spectrum management related things */ static void ieee80211_chswitch_work(struct work_struct *work) { @@ -1090,6 +1122,13 @@ static bool ieee80211_assoc_success(struct ieee80211_work *wk, ieee80211_set_associated(sdata, cbss, changed); /* + * If we're using 4-addr mode, let the AP know that we're + * doing so, so that it can create the STA VLAN on its side + */ + if (ifmgd->use_4addr) + ieee80211_send_4addr_nullfunc(local, sdata); + + /* * Start timer to probe the connection to the AP now. * Also start the timer that will detect beacon loss. */ |