From: Dedy Lansky dlansky@codeaurora.org
commit 30ca1aa536211f5ac3de0173513a7a99a98a97f3 upstream.
Make ieee80211_send_layer2_update() a common function so other drivers can re-use it.
Signed-off-by: Dedy Lansky dlansky@codeaurora.org Signed-off-by: Johannes Berg johannes.berg@intel.com [bwh: Backported to 4.19 as dependency of commit 3e493173b784 "mac80211: Do not send Layer 2 Update frame before authorization"] Signed-off-by: Ben Hutchings ben.hutchings@codethink.co.uk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- include/net/cfg80211.h | 11 +++++++++++ net/mac80211/cfg.c | 48 ++---------------------------------------------- net/wireless/util.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 58 insertions(+), 46 deletions(-)
--- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -4734,6 +4734,17 @@ const u8 *cfg80211_find_vendor_ie(unsign const u8 *ies, int len);
/** + * cfg80211_send_layer2_update - send layer 2 update frame + * + * @dev: network device + * @addr: STA MAC address + * + * Wireless drivers can use this function to update forwarding tables in bridge + * devices upon STA association. + */ +void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr); + +/** * DOC: Regulatory enforcement infrastructure * * TODO --- a/net/mac80211/cfg.c +++ b/net/mac80211/cfg.c @@ -1096,50 +1096,6 @@ static int ieee80211_stop_ap(struct wiph return 0; }
-/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */ -struct iapp_layer2_update { - u8 da[ETH_ALEN]; /* broadcast */ - u8 sa[ETH_ALEN]; /* STA addr */ - __be16 len; /* 6 */ - u8 dsap; /* 0 */ - u8 ssap; /* 0 */ - u8 control; - u8 xid_info[3]; -} __packed; - -static void ieee80211_send_layer2_update(struct sta_info *sta) -{ - struct iapp_layer2_update *msg; - struct sk_buff *skb; - - /* Send Level 2 Update Frame to update forwarding tables in layer 2 - * bridge devices */ - - skb = dev_alloc_skb(sizeof(*msg)); - if (!skb) - return; - msg = skb_put(skb, sizeof(*msg)); - - /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID) - * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */ - - eth_broadcast_addr(msg->da); - memcpy(msg->sa, sta->sta.addr, ETH_ALEN); - msg->len = htons(6); - msg->dsap = 0; - msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */ - msg->control = 0xaf; /* XID response lsb.1111F101. - * F=0 (no poll command; unsolicited frame) */ - msg->xid_info[0] = 0x81; /* XID format identifier */ - msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */ - msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */ - - skb->dev = sta->sdata->dev; - skb->protocol = eth_type_trans(skb, sta->sdata->dev); - memset(skb->cb, 0, sizeof(skb->cb)); - netif_rx_ni(skb); -} - static int sta_apply_auth_flags(struct ieee80211_local *local, struct sta_info *sta, u32 mask, u32 set) @@ -1508,7 +1464,7 @@ static int ieee80211_add_station(struct }
if (layer2_update) - ieee80211_send_layer2_update(sta); + cfg80211_send_layer2_update(sta->sdata->dev, sta->sta.addr);
rcu_read_unlock();
@@ -1610,7 +1566,7 @@ static int ieee80211_change_station(stru if (test_sta_flag(sta, WLAN_STA_AUTHORIZED)) ieee80211_vif_inc_num_mcast(sta->sdata);
- ieee80211_send_layer2_update(sta); + cfg80211_send_layer2_update(sta->sdata->dev, sta->sta.addr); }
err = sta_apply_parameters(local, sta, params); --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -1919,3 +1919,48 @@ bool cfg80211_iftype_allowed(struct wiph return false; } EXPORT_SYMBOL(cfg80211_iftype_allowed); + +/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */ +struct iapp_layer2_update { + u8 da[ETH_ALEN]; /* broadcast */ + u8 sa[ETH_ALEN]; /* STA addr */ + __be16 len; /* 6 */ + u8 dsap; /* 0 */ + u8 ssap; /* 0 */ + u8 control; + u8 xid_info[3]; +} __packed; + +void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr) +{ + struct iapp_layer2_update *msg; + struct sk_buff *skb; + + /* Send Level 2 Update Frame to update forwarding tables in layer 2 + * bridge devices */ + + skb = dev_alloc_skb(sizeof(*msg)); + if (!skb) + return; + msg = skb_put(skb, sizeof(*msg)); + + /* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID) + * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */ + + eth_broadcast_addr(msg->da); + ether_addr_copy(msg->sa, addr); + msg->len = htons(6); + msg->dsap = 0; + msg->ssap = 0x01; /* NULL LSAP, CR Bit: Response */ + msg->control = 0xaf; /* XID response lsb.1111F101. + * F=0 (no poll command; unsolicited frame) */ + msg->xid_info[0] = 0x81; /* XID format identifier */ + msg->xid_info[1] = 1; /* LLC types/classes: Type 1 LLC */ + msg->xid_info[2] = 0; /* XID sender's receive window size (RW) */ + + skb->dev = dev; + skb->protocol = eth_type_trans(skb, dev); + memset(skb->cb, 0, sizeof(skb->cb)); + netif_rx_ni(skb); +} +EXPORT_SYMBOL(cfg80211_send_layer2_update);