diff options
| author | Dedy Lansky <dlansky@codeaurora.org> | 2018-07-29 14:59:16 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-23 08:19:34 +0100 |
| commit | ab567894b3c1b80b6aa3df2eb85e5528c2834fdd (patch) | |
| tree | c1acda5fe43eabac84329c1f0a6bb83e8b42729f /net/wireless | |
| parent | 246eee7b5748cca95ddadadc2d350427ff7bb70a (diff) | |
cfg80211/mac80211: make ieee80211_send_layer2_update a public function
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 4.9 as dependency of commit 3e493173b784
"mac80211: Do not send Layer 2 Update frame before authorization":
- Retain type-casting of skb_put() return value
- Adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/util.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c index c93f333c675b..ecce7f8706b4 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -1794,3 +1794,48 @@ EXPORT_SYMBOL(rfc1042_header); const unsigned char bridge_tunnel_header[] __aligned(2) = { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 }; EXPORT_SYMBOL(bridge_tunnel_header); + +/* 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 = (struct iapp_layer2_update *)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); |