* [PATCH AUTOSEL 6.13 10/49] wifi: mac80211: add strict mode disabling workarounds
[not found] <20250403190408.2676344-1-sashal@kernel.org>
@ 2025-04-03 19:03 ` Sasha Levin
2025-04-03 19:03 ` [PATCH AUTOSEL 6.13 11/49] wifi: mac80211: ensure sdata->work is canceled before initialized Sasha Levin
2025-04-03 19:03 ` [PATCH AUTOSEL 6.13 38/49] wifi: mt76: mt76x2u: add TP-Link TL-WDN6200 ID to device table Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2025-04-03 19:03 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Johannes Berg, Ilan Peer, Miri Korenblit, Sasha Levin, johannes,
linux-wireless
From: Johannes Berg <johannes.berg@intel.com>
[ Upstream commit 3ad4fce66e4f9d82abfc366707757e29cc14a9d2 ]
Add a strict mode where we disable certain workarounds and have
additional checks such as, for now, that VHT capabilities from
association response match those from beacon/probe response. We
can extend the checks in the future.
Make it an opt-in setting by the driver so it can be set there
in some driver-specific way, for example. Also allow setting
this one hw flag through the hwflags debugfs, by writing a new
strict=0 or strict=1 value.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20250205110958.5cecb0469479.I4a69617dc60ba0d6308416ffbc3102cfd08ba068@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
include/net/mac80211.h | 6 ++++++
net/mac80211/debugfs.c | 44 +++++++++++++++++++++++++++++++++++++++--
net/mac80211/mlme.c | 45 +++++++++++++++++++++++++++++-------------
3 files changed, 79 insertions(+), 16 deletions(-)
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index ab8dce1f2c271..b33acea0f5258 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -2845,6 +2845,11 @@ struct ieee80211_txq {
* implements MLO, so operation can continue on other links when one
* link is switching.
*
+ * @IEEE80211_HW_STRICT: strictly enforce certain things mandated by the spec
+ * but otherwise ignored/worked around for interoperability. This is a
+ * HW flag so drivers can opt in according to their own control, e.g. in
+ * testing.
+ *
* @NUM_IEEE80211_HW_FLAGS: number of hardware flags, used for sizing arrays
*/
enum ieee80211_hw_flags {
@@ -2905,6 +2910,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_DISALLOW_PUNCTURING,
IEEE80211_HW_DISALLOW_PUNCTURING_5GHZ,
IEEE80211_HW_HANDLES_QUIET_CSA,
+ IEEE80211_HW_STRICT,
/* keep last, obviously */
NUM_IEEE80211_HW_FLAGS
diff --git a/net/mac80211/debugfs.c b/net/mac80211/debugfs.c
index be2e486907f94..ac808702bc108 100644
--- a/net/mac80211/debugfs.c
+++ b/net/mac80211/debugfs.c
@@ -492,6 +492,7 @@ static const char *hw_flag_names[] = {
FLAG(DISALLOW_PUNCTURING),
FLAG(DISALLOW_PUNCTURING_5GHZ),
FLAG(HANDLES_QUIET_CSA),
+ FLAG(STRICT),
#undef FLAG
};
@@ -524,6 +525,46 @@ static ssize_t hwflags_read(struct file *file, char __user *user_buf,
return rv;
}
+static ssize_t hwflags_write(struct file *file, const char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ieee80211_local *local = file->private_data;
+ char buf[100];
+ int val;
+
+ if (count >= sizeof(buf))
+ return -EINVAL;
+
+ if (copy_from_user(buf, user_buf, count))
+ return -EFAULT;
+
+ if (count && buf[count - 1] == '\n')
+ buf[count - 1] = '\0';
+ else
+ buf[count] = '\0';
+
+ if (sscanf(buf, "strict=%d", &val) == 1) {
+ switch (val) {
+ case 0:
+ ieee80211_hw_set(&local->hw, STRICT);
+ return count;
+ case 1:
+ __clear_bit(IEEE80211_HW_STRICT, local->hw.flags);
+ return count;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static const struct file_operations hwflags_ops = {
+ .open = simple_open,
+ .read = hwflags_read,
+ .write = hwflags_write,
+};
+
static ssize_t misc_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
@@ -574,7 +615,6 @@ static ssize_t queues_read(struct file *file, char __user *user_buf,
return simple_read_from_buffer(user_buf, count, ppos, buf, res);
}
-DEBUGFS_READONLY_FILE_OPS(hwflags);
DEBUGFS_READONLY_FILE_OPS(queues);
DEBUGFS_READONLY_FILE_OPS(misc);
@@ -651,7 +691,7 @@ void debugfs_hw_add(struct ieee80211_local *local)
#ifdef CONFIG_PM
DEBUGFS_ADD_MODE(reset, 0200);
#endif
- DEBUGFS_ADD(hwflags);
+ DEBUGFS_ADD_MODE(hwflags, 0600);
DEBUGFS_ADD(user_power);
DEBUGFS_ADD(power);
DEBUGFS_ADD(hw_conf);
diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 0e3db0c2920bc..4153cfededb62 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -168,6 +168,9 @@ ieee80211_determine_ap_chan(struct ieee80211_sub_if_data *sdata,
bool no_vht = false;
u32 ht_cfreq;
+ if (ieee80211_hw_check(&sdata->local->hw, STRICT))
+ ignore_ht_channel_mismatch = false;
+
*chandef = (struct cfg80211_chan_def) {
.chan = channel,
.width = NL80211_CHAN_WIDTH_20_NOHT,
@@ -387,7 +390,7 @@ ieee80211_verify_peer_he_mcs_support(struct ieee80211_sub_if_data *sdata,
* zeroes, which is nonsense, and completely inconsistent with itself
* (it doesn't have 8 streams). Accept the settings in this case anyway.
*/
- if (!ap_min_req_set)
+ if (!ieee80211_hw_check(&sdata->local->hw, STRICT) && !ap_min_req_set)
return true;
/* make sure the AP is consistent with itself
@@ -447,7 +450,7 @@ ieee80211_verify_sta_he_mcs_support(struct ieee80211_sub_if_data *sdata,
* zeroes, which is nonsense, and completely inconsistent with itself
* (it doesn't have 8 streams). Accept the settings in this case anyway.
*/
- if (!ap_min_req_set)
+ if (!ieee80211_hw_check(&sdata->local->hw, STRICT) && !ap_min_req_set)
return true;
/* Need to go over for 80MHz, 160MHz and for 80+80 */
@@ -1214,13 +1217,15 @@ static bool ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
* Some APs apparently get confused if our capabilities are better
* than theirs, so restrict what we advertise in the assoc request.
*/
- if (!(ap_vht_cap->vht_cap_info &
- cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
- cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
- IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
- else if (!(ap_vht_cap->vht_cap_info &
- cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
- cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
+ if (!ieee80211_hw_check(&local->hw, STRICT)) {
+ if (!(ap_vht_cap->vht_cap_info &
+ cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
+ cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
+ IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
+ else if (!(ap_vht_cap->vht_cap_info &
+ cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
+ cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
+ }
/*
* If some other vif is using the MU-MIMO capability we cannot associate
@@ -1262,14 +1267,16 @@ static bool ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
return mu_mimo_owner;
}
-static void ieee80211_assoc_add_rates(struct sk_buff *skb,
+static void ieee80211_assoc_add_rates(struct ieee80211_local *local,
+ struct sk_buff *skb,
enum nl80211_chan_width width,
struct ieee80211_supported_band *sband,
struct ieee80211_mgd_assoc_data *assoc_data)
{
u32 rates;
- if (assoc_data->supp_rates_len) {
+ if (assoc_data->supp_rates_len &&
+ !ieee80211_hw_check(&local->hw, STRICT)) {
/*
* Get all rates supported by the device and the AP as
* some APs don't like getting a superset of their rates
@@ -1483,7 +1490,7 @@ static size_t ieee80211_assoc_link_elems(struct ieee80211_sub_if_data *sdata,
*capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;
if (sband->band != NL80211_BAND_S1GHZ)
- ieee80211_assoc_add_rates(skb, width, sband, assoc_data);
+ ieee80211_assoc_add_rates(local, skb, width, sband, assoc_data);
if (*capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
*capab & WLAN_CAPABILITY_RADIO_MEASURE) {
@@ -1927,7 +1934,8 @@ static int ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
* for some reason check it and want it to be set, set the bit for all
* pre-EHT connections as we used to do.
*/
- if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_EHT)
+ if (link->u.mgd.conn.mode < IEEE80211_CONN_MODE_EHT &&
+ !ieee80211_hw_check(&local->hw, STRICT))
capab |= WLAN_CAPABILITY_ESS;
/* add the elements for the assoc (main) link */
@@ -4802,7 +4810,7 @@ static bool ieee80211_assoc_config_link(struct ieee80211_link_data *link,
* 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
* "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
*/
- if (!is_6ghz &&
+ if (!ieee80211_hw_check(&local->hw, STRICT) && !is_6ghz &&
((assoc_data->wmm && !elems->wmm_param) ||
(link->u.mgd.conn.mode >= IEEE80211_CONN_MODE_HT &&
(!elems->ht_cap_elem || !elems->ht_operation)) ||
@@ -4938,6 +4946,15 @@ static bool ieee80211_assoc_config_link(struct ieee80211_link_data *link,
bss_vht_cap = (const void *)elem->data;
}
+ if (ieee80211_hw_check(&local->hw, STRICT) &&
+ (!bss_vht_cap || memcmp(bss_vht_cap, elems->vht_cap_elem,
+ sizeof(*bss_vht_cap)))) {
+ rcu_read_unlock();
+ ret = false;
+ link_info(link, "VHT capabilities mismatch\n");
+ goto out;
+ }
+
ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
elems->vht_cap_elem,
bss_vht_cap, link_sta);
--
2.39.5
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