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cfg80211: move TSF into IEs

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While technically the TSF isn't an IE, it can be
necessary to distinguish between the TSF from a
beacon and a probe response, in particular in
order to know the next DTIM TBTT, as not all APs
are spec compliant wrt. TSF==0 being a DTIM TBTT
and thus the DTIM count needs to be taken into
account as well.

To allow this, move the TSF into the IE struct
so it can be known whence it came.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2013-02-05 16:54:31 +01:00
parent 83c7aa1a14
commit 8cef2c9df8
6 changed files with 37 additions and 24 deletions
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27
net/wireless/nl80211.c
View File

@ -4997,6 +4997,7 @@ static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
const struct cfg80211_bss_ies *ies;
void *hdr;
struct nlattr *bss;
bool tsf = false;
ASSERT_WDEV_LOCK(wdev);
@ -5020,22 +5021,24 @@ static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
rcu_read_lock();
ies = rcu_dereference(res->ies);
if (ies && ies->len && nla_put(msg, NL80211_BSS_INFORMATION_ELEMENTS,
ies->len, ies->data)) {
rcu_read_unlock();
goto nla_put_failure;
if (ies) {
if (nla_put_u64(msg, NL80211_BSS_TSF, ies->tsf))
goto fail_unlock_rcu;
tsf = true;
if (ies->len && nla_put(msg, NL80211_BSS_INFORMATION_ELEMENTS,
ies->len, ies->data))
goto fail_unlock_rcu;
}
ies = rcu_dereference(res->beacon_ies);
if (ies && ies->len && nla_put(msg, NL80211_BSS_BEACON_IES,
ies->len, ies->data)) {
rcu_read_unlock();
goto nla_put_failure;
if (ies) {
if (!tsf && nla_put_u64(msg, NL80211_BSS_TSF, ies->tsf))
goto fail_unlock_rcu;
if (ies->len && nla_put(msg, NL80211_BSS_BEACON_IES,
ies->len, ies->data))
goto fail_unlock_rcu;
}
rcu_read_unlock();
if (res->tsf &&
nla_put_u64(msg, NL80211_BSS_TSF, res->tsf))
goto nla_put_failure;
if (res->beacon_interval &&
nla_put_u16(msg, NL80211_BSS_BEACON_INTERVAL, res->beacon_interval))
goto nla_put_failure;
@ -5080,6 +5083,8 @@ static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,
return genlmsg_end(msg, hdr);
fail_unlock_rcu:
rcu_read_unlock();
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;