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mac80211: Disallow to set multicast BSSID

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Okay, here is the first of the five patches. After applying all
of them you should be able to build/join huge city mesh networks
(e.g. with the OLSR protocol) with the most of the mac80211 wireless
drivers by setting a fixed BSSID in the ad hoc mode. (If you found no
other bug/problem.) This was not specified in the original standard,
but is a widely used de facto standard.

The first patch now completely disallow to set multicast MAC addresses
as BSSID. The behavior before was really strange.

Signed-off-by: Alina Friedrichsen <x-alina@gmx.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Alina Friedrichsen 2009-01-06 02:41:35 +01:00 • committed by John W. Linville
parent cca3e99861
commit 0efcdfd6ed
1 changed files with 7 additions and 2 deletions
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9
net/mac80211/mlme.c
View file

@ -2548,11 +2548,16 @@ int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
{ {
struct ieee80211_if_sta *ifsta; struct ieee80211_if_sta *ifsta;
int res; int res;
bool valid;
ifsta = &sdata->u.sta; ifsta = &sdata->u.sta;
valid = is_valid_ether_addr(bssid);
if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) { if (memcmp(ifsta->bssid, bssid, ETH_ALEN) != 0) {
memcpy(ifsta->bssid, bssid, ETH_ALEN); if(valid)
memcpy(ifsta->bssid, bssid, ETH_ALEN);
else
memset(ifsta->bssid, 0, ETH_ALEN);
res = 0; res = 0;
/* /*
* Hack! See also ieee80211_sta_set_ssid. * Hack! See also ieee80211_sta_set_ssid.
@ -2566,7 +2571,7 @@ int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
} }
} }
if (is_valid_ether_addr(bssid)) if (valid)
ifsta->flags |= IEEE80211_STA_BSSID_SET; ifsta->flags |= IEEE80211_STA_BSSID_SET;
else else
ifsta->flags &= ~IEEE80211_STA_BSSID_SET; ifsta->flags &= ~IEEE80211_STA_BSSID_SET;