Add support for band-steering access points to net80211.

Some access points have a feature called "band steering" where they
will try to push clients from 2 GHz channels to 5 GHz channels.
If a client sends probe-requests on both 2 GHz and 5GHz channels, and
then attempts to authenticate on a 2 GHz channel, such APs will deny
authentication and hope that the client will come back on a 5 GHz channel.

So if we fail to AUTH for any reason, and if there is a different
AP with the same ESSID that we haven't tried yet, try that AP next.
Keep trying until no APs are left, and only then continue scanning.

APs with support for this feature were provided by Mischa Peters.

ok phessler@ mpi@

1 files changed, 4 insertions, 1 deletions

diff --git a/sys/net80211/ieee80211_node.h b/sys/net80211/ieee80211_node.h
index dd07921bc7e..334efcdf5b1 100644
--- a/sys/net80211/ieee80211_node.h
+++ b/sys/net80211/ieee80211_node.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ieee80211_node.h,v 1.76 2018/08/07 18:13:14 stsp Exp $	*/
+/*	$OpenBSD: ieee80211_node.h,v 1.77 2018/08/13 15:19:52 stsp Exp $	*/
 /*	$NetBSD: ieee80211_node.h,v 1.9 2004/04/30 22:57:32 dyoung Exp $	*/
 
 /*-
@@ -416,6 +416,9 @@ void ieee80211_node_leave(struct ieee80211com *,
 		struct ieee80211_node *);
 int ieee80211_match_bss(struct ieee80211com *,
 		struct ieee80211_node *);
+struct ieee80211_node *ieee80211_node_choose_bss(struct ieee80211com *, int,
+		struct ieee80211_node **);
+void ieee80211_node_join_bss(struct ieee80211com *, struct ieee80211_node *);
 void ieee80211_create_ibss(struct ieee80211com* ,
 		struct ieee80211_channel *);
 void ieee80211_notify_dtim(struct ieee80211com *);