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mac80211: Unsolicited broadcast probe response support 

This patch adds mac80211 support to configure unsolicited
broadcast probe response transmission for in-band discovery in 6GHz.

Changes include functions to store and retrieve probe response template,
and packet interval (0 - 20 TUs).
Setting interval to 0 disables the unsolicited broadcast probe response
transmission.

Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
Link: https://lore.kernel.org/r/010101747a946b35-ad25858a-1f1f-48df-909e-dc7bf26d9169-000000@us-west-2.amazonses.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Aloka Dixit 2020-09-11 00:33:01 +00:00 committed by Johannes Berg
parent 7443dcd1f1
commit 632189a018
4 changed files with 97 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
include/net/mac80211.h
View File

@ -318,6 +318,8 @@ struct ieee80211_vif_chanctx_switch {
* @BSS_CHANGED_HE_OBSS_PD: OBSS Packet Detection status changed.
* @BSS_CHANGED_HE_BSS_COLOR: BSS Color has changed
* @BSS_CHANGED_FILS_DISCOVERY: FILS discovery status changed.
* @BSS_CHANGED_UNSOL_BCAST_PROBE_RESP: Unsolicited broadcast probe response
* status changed.
*
*/
enum ieee80211_bss_change {
@ -352,6 +354,7 @@ enum ieee80211_bss_change {
BSS_CHANGED_HE_OBSS_PD = 1<<28,
BSS_CHANGED_HE_BSS_COLOR = 1<<29,
BSS_CHANGED_FILS_DISCOVERY = 1<<30,
BSS_CHANGED_UNSOL_BCAST_PROBE_RESP = 1<<31,
/* when adding here, make sure to change ieee80211_reconfig */
};
@ -622,6 +625,8 @@ struct ieee80211_fils_discovery {
* @he_obss_pd: OBSS Packet Detection parameters.
* @he_bss_color: BSS coloring settings, if BSS supports HE
* @fils_discovery: FILS discovery configuration
* @unsol_bcast_probe_resp_interval: Unsolicited broadcast probe response
* interval.
*/
struct ieee80211_bss_conf {
const u8 *bssid;
@ -690,6 +695,7 @@ struct ieee80211_bss_conf {
struct ieee80211_he_obss_pd he_obss_pd;
struct cfg80211_he_bss_color he_bss_color;
struct ieee80211_fils_discovery fils_discovery;
u32 unsol_bcast_probe_resp_interval;
};
/**
@ -6656,4 +6662,18 @@ bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable);
*/
struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
struct ieee80211_vif *vif);
/**
* ieee80211_get_unsol_bcast_probe_resp_tmpl - Get unsolicited broadcast
* probe response template.
* @hw: pointer obtained from ieee80211_alloc_hw().
* @vif: &struct ieee80211_vif pointer from the add_interface callback.
*
* The driver is responsible for freeing the returned skb.
*
* Return: Unsolicited broadcast probe response template. %NULL on error.
*/
struct sk_buff *
ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
struct ieee80211_vif *vif);
#endif /* MAC80211_H */

41
net/mac80211/cfg.c
View File

@ -864,6 +864,32 @@ static int ieee80211_set_fils_discovery(struct ieee80211_sub_if_data *sdata,
return 0;
}
static int
ieee80211_set_unsol_bcast_probe_resp(struct ieee80211_sub_if_data *sdata,
struct cfg80211_unsol_bcast_probe_resp *params)
{
struct unsol_bcast_probe_resp_data *new, *old = NULL;
if (!params->tmpl || !params->tmpl_len)
return -EINVAL;
old = sdata_dereference(sdata->u.ap.unsol_bcast_probe_resp, sdata);
new = kzalloc(sizeof(*new) + params->tmpl_len, GFP_KERNEL);
if (!new)
return -ENOMEM;
new->len = params->tmpl_len;
memcpy(new->data, params->tmpl, params->tmpl_len);
rcu_assign_pointer(sdata->u.ap.unsol_bcast_probe_resp, new);
if (old)
kfree_rcu(old, rcu_head);
sdata->vif.bss_conf.unsol_bcast_probe_resp_interval =
params->interval;
return 0;
}
static int ieee80211_set_ftm_responder_params(
struct ieee80211_sub_if_data *sdata,
const u8 *lci, size_t lci_len,
@ -1138,6 +1164,14 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
changed |= BSS_CHANGED_FILS_DISCOVERY;
}
if (params->unsol_bcast_probe_resp.interval) {
err = ieee80211_set_unsol_bcast_probe_resp(sdata,
&params->unsol_bcast_probe_resp);
if (err < 0)
goto error;
changed |= BSS_CHANGED_UNSOL_BCAST_PROBE_RESP;
}
err = drv_start_ap(sdata->local, sdata);
if (err) {
old = sdata_dereference(sdata->u.ap.beacon, sdata);
@ -1197,6 +1231,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
struct beacon_data *old_beacon;
struct probe_resp *old_probe_resp;
struct fils_discovery_data *old_fils_discovery;
struct unsol_bcast_probe_resp_data *old_unsol_bcast_probe_resp;
struct cfg80211_chan_def chandef;
sdata_assert_lock(sdata);
@ -1207,6 +1242,9 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
old_probe_resp = sdata_dereference(sdata->u.ap.probe_resp, sdata);
old_fils_discovery = sdata_dereference(sdata->u.ap.fils_discovery,
sdata);
old_unsol_bcast_probe_resp =
sdata_dereference(sdata->u.ap.unsol_bcast_probe_resp,
sdata);
/* abort any running channel switch */
mutex_lock(&local->mtx);
@ -1231,11 +1269,14 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
RCU_INIT_POINTER(sdata->u.ap.fils_discovery, NULL);
RCU_INIT_POINTER(sdata->u.ap.unsol_bcast_probe_resp, NULL);
kfree_rcu(old_beacon, rcu_head);
if (old_probe_resp)
kfree_rcu(old_probe_resp, rcu_head);
if (old_fils_discovery)
kfree_rcu(old_fils_discovery, rcu_head);
if (old_unsol_bcast_probe_resp)
kfree_rcu(old_unsol_bcast_probe_resp, rcu_head);
kfree(sdata->vif.bss_conf.ftmr_params);
sdata->vif.bss_conf.ftmr_params = NULL;

7
net/mac80211/ieee80211_i.h
View File

@ -277,6 +277,12 @@ struct fils_discovery_data {
u8 data[];
};
struct unsol_bcast_probe_resp_data {
struct rcu_head rcu_head;
int len;
u8 data[];
};
struct ps_data {
/* yes, this looks ugly, but guarantees that we can later use
* bitmap_empty :)
@ -293,6 +299,7 @@ struct ieee80211_if_ap {
struct beacon_data __rcu *beacon;
struct probe_resp __rcu *probe_resp;
struct fils_discovery_data __rcu *fils_discovery;
struct unsol_bcast_probe_resp_data __rcu *unsol_bcast_probe_resp;
/* to be used after channel switch. */
struct cfg80211_beacon_data *next_beacon;

29
net/mac80211/tx.c
View File

@ -5027,6 +5027,35 @@ struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
struct sk_buff *
ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{
struct sk_buff *skb = NULL;
struct unsol_bcast_probe_resp_data *tmpl = NULL;
struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
if (sdata->vif.type != NL80211_IFTYPE_AP)
return NULL;
rcu_read_lock();
tmpl = rcu_dereference(sdata->u.ap.unsol_bcast_probe_resp);
if (!tmpl) {
rcu_read_unlock();
return NULL;
}
skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
if (skb) {
skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
skb_put_data(skb, tmpl->data, tmpl->len);
}
rcu_read_unlock();
return skb;
}
EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
struct ieee80211_vif *vif)
{