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mac80211: accept public action frames with mismatched BSSID

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Arik's patch "mac80211: allow action frames with unknown
BSSID in GO mode" allowed any action frames in P2P mode
to go through, but only to cooked monitor interfaces as
the IEEE80211_RX_RA_MATCH was still cleared. As a result
my no-monitor patches broke invitation responses.

Instead of allowing any action frames in P2P GO mode to
go through with a wrong BSSID like that patch did, allow
all public action frames. They will never be processed
by mac80211, but can be reported via nl80211 then.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2011-12-06 10:39:40 +01:00 committed by John W. Linville
parent aa5b549215
commit 3df6eaea76
2 changed files with 27 additions and 3 deletions
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17
include/linux/ieee80211.h
View File

@ -1694,6 +1694,23 @@ static inline bool ieee80211_is_robust_mgmt_frame(struct ieee80211_hdr *hdr)
return false; return false;
} }
/**
* ieee80211_is_public_action - check if frame is a public action frame
* @hdr: the frame
* @len: length of the frame
*/
static inline bool ieee80211_is_public_action(struct ieee80211_hdr *hdr,
size_t len)
{
struct ieee80211_mgmt *mgmt = (void *)hdr;
if (len < IEEE80211_MIN_ACTION_SIZE)
return false;
if (!ieee80211_is_action(hdr->frame_control))
return false;
return mgmt->u.action.category == WLAN_CATEGORY_PUBLIC;
}
/** /**
* ieee80211_fhss_chan_to_freq - get channel frequency * ieee80211_fhss_chan_to_freq - get channel frequency
* @channel: the FHSS channel * @channel: the FHSS channel

13
net/mac80211/rx.c
View File

@ -2797,10 +2797,17 @@ static int prepare_for_handlers(struct ieee80211_rx_data *rx,
return 0; return 0;
} else if (!ieee80211_bssid_match(bssid, } else if (!ieee80211_bssid_match(bssid,
sdata->vif.addr)) { sdata->vif.addr)) {
/*
* Accept public action frames even when the
* BSSID doesn't match, this is used for P2P
* and location updates. Note that mac80211
* itself never looks at these frames.
*/
if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) && if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
!ieee80211_is_beacon(hdr->frame_control) && ieee80211_is_public_action(hdr, skb->len))
!(ieee80211_is_action(hdr->frame_control) && return 1;
sdata->vif.p2p)) if (!(status->rx_flags & IEEE80211_RX_IN_SCAN) &&
!ieee80211_is_beacon(hdr->frame_control))
return 0; return 0;
status->rx_flags &= ~IEEE80211_RX_RA_MATCH; status->rx_flags &= ~IEEE80211_RX_RA_MATCH;
} }