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When a channel switch is done to a channel with different operating

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characteristics force the stations to re-associate so protocol state
is re-initialized.  Note that for 11h/DFS this is irrelevant as channel
changes are never cross-band.

Reviewed by:	ctlaw
This commit is contained in:
Sam Leffler 2009-06-03 23:33:09 +00:00
parent 4e15098821
commit 7131987ded
1 changed files with 34 additions and 0 deletions
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34
sys/net80211/ieee80211_hostap.c
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@ -127,6 +127,28 @@ sta_csa(void *arg, struct ieee80211_node *ni)
}
}
static void
sta_drop(void *arg, struct ieee80211_node *ni)
{
struct ieee80211vap *vap = arg;
if (ni->ni_vap == vap && ni->ni_associd != 0)
ieee80211_node_leave(ni);
}
/*
* Does a channel change require associated stations to re-associate
* so protocol state is correct. This is used when doing CSA across
* bands or similar (e.g. HT -> legacy).
*/
static int
isbandchange(struct ieee80211com *ic)
{
return ((ic->ic_bsschan->ic_flags ^ ic->ic_csa_newchan->ic_flags) &
(IEEE80211_CHAN_2GHZ | IEEE80211_CHAN_5GHZ | IEEE80211_CHAN_HALF |
IEEE80211_CHAN_QUARTER | IEEE80211_CHAN_HT)) != 0;
}
/*
* IEEE80211_M_HOSTAP vap state machine handler.
*/
@ -307,6 +329,18 @@ hostap_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
}
ieee80211_node_authorize(vap->iv_bss);
break;
case IEEE80211_S_CSA:
if (ostate == IEEE80211_S_RUN && isbandchange(ic)) {
/*
* On a ``band change'' silently drop associated
* stations as they must re-associate before they
* can pass traffic (as otherwise protocol state
* such as capabilities and the negotiated rate
* set may/will be wrong).
*/
ieee80211_iterate_nodes(&ic->ic_sta, sta_drop, vap);
}
break;
default:
break;
}