nl80211/mac80211: allow non-linear skb in rx_control_port

The current implementation of cfg80211_rx_control_port assumed that the
caller could provide a contiguous region of memory for the control port
frame to be sent up to userspace.  Unfortunately, many drivers produce
non-linear skbs, especially for data frames.  This resulted in userspace
getting notified of control port frames with correct metadata (from
address, port, etc) yet garbage / nonsense contents, resulting in bad
handshakes, disconnections, etc.

mac80211 linearizes skbs containing management frames.  But it didn't
seem worthwhile to do this for control port frames.  Thus the signature
of cfg80211_rx_control_port was changed to take the skb directly.
nl80211 then takes care of obtaining control port frame data directly
from the (linear | non-linear) skb.

The caller is still responsible for freeing the skb,
cfg80211_rx_control_port does not take ownership of it.

Fixes: 6a671a50f819 ("nl80211: Add CMD_CONTROL_PORT_FRAME API")
Signed-off-by: Denis Kenzior <denkenz@gmail.com>
[fix some kernel-doc formatting, add fixes tag]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

3 files changed, 26 insertions, 21 deletions

diff --git a/net/mac80211/rx.c b/net/mac80211/rx.c
index 0a38cc1cbebc..932985ca4e66 100644
--- a/net/mac80211/rx.c
+++ b/net/mac80211/rx.c
@@ -2254,11 +2254,8 @@ static void ieee80211_deliver_skb_to_local_stack(struct sk_buff *skb,
 		     sdata->control_port_over_nl80211)) {
 		struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
 		bool noencrypt = status->flag & RX_FLAG_DECRYPTED;
-		struct ethhdr *ehdr = eth_hdr(skb);
 
-		cfg80211_rx_control_port(dev, skb->data, skb->len,
-					 ehdr->h_source,
-					 be16_to_cpu(skb->protocol), noencrypt);
+		cfg80211_rx_control_port(dev, skb, noencrypt);
 		dev_kfree_skb(skb);
 	} else {
 		/* deliver to local stack */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 4eece06be1e7..b6c700572755 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -14923,20 +14923,24 @@ void cfg80211_mgmt_tx_status(struct wireless_dev *wdev, u64 cookie,
 EXPORT_SYMBOL(cfg80211_mgmt_tx_status);
 
 static int __nl80211_rx_control_port(struct net_device *dev,
-				     const u8 *buf, size_t len,
-				     const u8 *addr, u16 proto,
+				     struct sk_buff *skb,
 				     bool unencrypted, gfp_t gfp)
 {
 	struct wireless_dev *wdev = dev->ieee80211_ptr;
 	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
+	struct ethhdr *ehdr = eth_hdr(skb);
+	const u8 *addr = ehdr->h_source;
+	u16 proto = be16_to_cpu(skb->protocol);
 	struct sk_buff *msg;
 	void *hdr;
+	struct nlattr *frame;
+
 	u32 nlportid = READ_ONCE(wdev->conn_owner_nlportid);
 
 	if (!nlportid)
 		return -ENOENT;
 
-	msg = nlmsg_new(100 + len, gfp);
+	msg = nlmsg_new(100 + skb->len, gfp);
 	if (!msg)
 		return -ENOMEM;
 
@@ -14950,13 +14954,17 @@ static int __nl80211_rx_control_port(struct net_device *dev,
 	    nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) ||
 	    nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
 			      NL80211_ATTR_PAD) ||
-	    nla_put(msg, NL80211_ATTR_FRAME, len, buf) ||
 	    nla_put(msg, NL80211_ATTR_MAC, ETH_ALEN, addr) ||
 	    nla_put_u16(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE, proto) ||
 	    (unencrypted && nla_put_flag(msg,
 					 NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT)))
 		goto nla_put_failure;
 
+	frame = nla_reserve(msg, NL80211_ATTR_FRAME, skb->len);
+	if (!frame)
+		goto nla_put_failure;
+
+	skb_copy_bits(skb, 0, nla_data(frame), skb->len);
 	genlmsg_end(msg, hdr);
 
 	return genlmsg_unicast(wiphy_net(&rdev->wiphy), msg, nlportid);
@@ -14967,14 +14975,12 @@ static int __nl80211_rx_control_port(struct net_device *dev,
 }
 
 bool cfg80211_rx_control_port(struct net_device *dev,
-			      const u8 *buf, size_t len,
-			      const u8 *addr, u16 proto, bool unencrypted)
+			      struct sk_buff *skb, bool unencrypted)
 {
 	int ret;
 
-	trace_cfg80211_rx_control_port(dev, buf, len, addr, proto, unencrypted);
-	ret = __nl80211_rx_control_port(dev, buf, len, addr, proto,
-					unencrypted, GFP_ATOMIC);
+	trace_cfg80211_rx_control_port(dev, skb, unencrypted);
+	ret = __nl80211_rx_control_port(dev, skb, unencrypted, GFP_ATOMIC);
 	trace_cfg80211_return_bool(ret == 0);
 	return ret == 0;
 }
diff --git a/net/wireless/trace.h b/net/wireless/trace.h
index 2b417a2fe63f..7c73510b161f 100644
--- a/net/wireless/trace.h
+++ b/net/wireless/trace.h
@@ -2627,23 +2627,25 @@ TRACE_EVENT(cfg80211_mgmt_tx_status,
 );
 
 TRACE_EVENT(cfg80211_rx_control_port,
-	TP_PROTO(struct net_device *netdev, const u8 *buf, size_t len,
-		 const u8 *addr, u16 proto, bool unencrypted),
-	TP_ARGS(netdev, buf, len, addr, proto, unencrypted),
+	TP_PROTO(struct net_device *netdev, struct sk_buff *skb,
+		 bool unencrypted),
+	TP_ARGS(netdev, skb, unencrypted),
 	TP_STRUCT__entry(
 		NETDEV_ENTRY
-		MAC_ENTRY(addr)
+		__field(int, len)
+		MAC_ENTRY(from)
 		__field(u16, proto)
 		__field(bool, unencrypted)
 	),
 	TP_fast_assign(
 		NETDEV_ASSIGN;
-		MAC_ASSIGN(addr, addr);
-		__entry->proto = proto;
+		__entry->len = skb->len;
+		MAC_ASSIGN(from, eth_hdr(skb)->h_source);
+		__entry->proto = be16_to_cpu(skb->protocol);
 		__entry->unencrypted = unencrypted;
 	),
-	TP_printk(NETDEV_PR_FMT ", " MAC_PR_FMT " proto: 0x%x, unencrypted: %s",
-		  NETDEV_PR_ARG, MAC_PR_ARG(addr),
+	TP_printk(NETDEV_PR_FMT ", len=%d, " MAC_PR_FMT ", proto: 0x%x, unencrypted: %s",
+		  NETDEV_PR_ARG, __entry->len, MAC_PR_ARG(from),
 		  __entry->proto, BOOL_TO_STR(__entry->unencrypted))
 );