[PATCH 0/2] FILS discovery and bcast probe resp support

[PATCH 0/2] FILS discovery and bcast probe resp support

[Aloka Dixit]

This patchset adds support for FILS discovery and broadcast
unsolicited probe response transmission in 6GHz for in-band
discovery.

Aloka Dixit (2):
  nl80211: FILS discovery/bcast probe resp support
  mac80211: FILS disc/bcast probe resp config

 include/net/cfg80211.h       | 26 ++++++++++++++++
 include/net/mac80211.h       | 17 +++++++++++
 include/uapi/linux/nl80211.h | 27 +++++++++++++++++
 net/mac80211/cfg.c           | 57 +++++++++++++++++++++++++++++++++++
 net/mac80211/ieee80211_i.h   |  8 +++++
 net/mac80211/tx.c            | 30 +++++++++++++++++++
 net/wireless/nl80211.c       | 58 ++++++++++++++++++++++++++++++++++++
 7 files changed, 223 insertions(+)

-- 
2.25.0

[PATCH 1/2] nl80211: FILS discovery/bcast probe resp support

[Aloka Dixit]

This patch adds new attribute, NL80211_ATTR_FD_BCASTPRESP_CFG
to configure FILS discovery and broadcast probe response in 6GHz
for in-band discovery.

Only one of the two is active at a time to reduce broadcast
packets over the air.

Maximum packet interval can be 20 TUs.
Packet interval set to 0 disables FILS discovery and broadcast
probe response transmission.

Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
---
 include/net/cfg80211.h       | 26 ++++++++++++++++
 include/uapi/linux/nl80211.h | 27 +++++++++++++++++
 net/wireless/nl80211.c       | 58 ++++++++++++++++++++++++++++++++++++
 3 files changed, 111 insertions(+)

diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h
index a82fc59a1d82..e4bc03947005 100644
--- a/include/net/cfg80211.h
+++ b/include/net/cfg80211.h
@@ -957,6 +957,8 @@ struct cfg80211_crypto_settings {
  * @assocresp_ies_len: length of assocresp_ies in octets
  * @probe_resp_len: length of probe response template (@probe_resp)
  * @probe_resp: probe response template (AP mode only)
+ * @bcast_presp: Broadcast probe response template (AP mode only)
+ * @fils_disc: FILS discovery template (AP mode only)
  * @ftm_responder: enable FTM responder functionality; -1 for no change
  *	(which also implies no change in LCI/civic location data)
  * @lci: Measurement Report element content, starting with Measurement Token
@@ -965,6 +967,8 @@ struct cfg80211_crypto_settings {
  *	Token (measurement type 11)
  * @lci_len: LCI data length
  * @civicloc_len: Civic location data length
+ * @bcast_presp_len: Broadcast probe response template length
+ * @fils_disc_len: FILS discovery template length
  */
 struct cfg80211_beacon_data {
 	const u8 *head, *tail;
@@ -974,6 +978,8 @@ struct cfg80211_beacon_data {
 	const u8 *probe_resp;
 	const u8 *lci;
 	const u8 *civicloc;
+	const u8 *bcast_presp;
+	const u8 *fils_disc;
 	s8 ftm_responder;
 
 	size_t head_len, tail_len;
@@ -983,6 +989,8 @@ struct cfg80211_beacon_data {
 	size_t probe_resp_len;
 	size_t lci_len;
 	size_t civicloc_len;
+	size_t bcast_presp_len;
+	size_t fils_disc_len;
 };
 
 struct mac_address {
@@ -1017,6 +1025,22 @@ struct cfg80211_bitrate_mask {
 	} control[NUM_NL80211_BANDS];
 };
 
+enum cfg80211_fd_bcastpresp_types {
+	CFG80211_TYPE_FILS_DISCOVERY = 1,
+	CFG80211_TYPE_BCAST_PROBE_RESP
+};
+
+/**
+ * struct cfg80211_fd_bcastpresp - FILS discovery/bcast probe response config
+ *
+ * @type: CFG80211_TYPE_FILS_DISCOVERY/CFG80211_TYPE_BCAST_PROBE_RESP
+ * @interval: FILS discovery/broadcast probe response interval in TUs
+ */
+struct cfg80211_fd_bcastpresp {
+	enum cfg80211_fd_bcastpresp_types type;
+	u32 interval;
+};
+
 /**
  * enum cfg80211_ap_settings_flags - AP settings flags
  *
@@ -1064,6 +1088,7 @@ enum cfg80211_ap_settings_flags {
  * @he_obss_pd: OBSS Packet Detection settings
  * @he_bss_color: BSS Color settings
  * @he_oper: HE operation IE (or %NULL if HE isn't enabled)
+ * @fd_bcastpresp: FILS discovery and broadcast probe response configuration
  */
 struct cfg80211_ap_settings {
 	struct cfg80211_chan_def chandef;
@@ -1094,6 +1119,7 @@ struct cfg80211_ap_settings {
 	u32 flags;
 	struct ieee80211_he_obss_pd he_obss_pd;
 	struct cfg80211_he_bss_color he_bss_color;
+	struct cfg80211_fd_bcastpresp fd_bcastpresp;
 };
 
 /**
diff --git a/include/uapi/linux/nl80211.h b/include/uapi/linux/nl80211.h
index 9679d561f7d0..3d7bb5c61002 100644
--- a/include/uapi/linux/nl80211.h
+++ b/include/uapi/linux/nl80211.h
@@ -2484,6 +2484,8 @@ enum nl80211_commands {
  * @NL80211_ATTR_RECEIVE_MULTICAST: multicast flag for the
  *	%NL80211_CMD_REGISTER_FRAME command, see the description there.
  *
+ * @NL80211_ATTR_FD_BCASTPRESP_CFG: FILS discovery/broadcast probe resp.
+ *
  * @NUM_NL80211_ATTR: total number of nl80211_attrs available
  * @NL80211_ATTR_MAX: highest attribute number currently defined
  * @__NL80211_ATTR_AFTER_LAST: internal use
@@ -2961,6 +2963,8 @@ enum nl80211_attrs {
 
 	NL80211_ATTR_RECEIVE_MULTICAST,
 
+	NL80211_ATTR_FD_BCASTPRESP_CFG,
+
 	/* add attributes here, update the policy in nl80211.c */
 
 	__NL80211_ATTR_AFTER_LAST,
@@ -6848,4 +6852,27 @@ enum nl80211_iftype_akm_attributes {
 	NL80211_IFTYPE_AKM_ATTR_MAX = __NL80211_IFTYPE_AKM_ATTR_LAST - 1,
 };
 
+/**
+ * enum nl80211_fd_bcastpresp_attributes - FILS disc/bcast probe resp settings
+ * @__NL80211_FD_BCASTPRESP_ATTR_INVALID: Invalid
+ *
+ * @NL80211_FD_BCASTPRESP_ATTR_TYPE: 1-FILS discovery, 2-broadcast probe resp
+ * @NL80211_FD_BCASTPRESP_ATTR_INT: FILS disc/bcast probe resp interval in TUs
+ * @NL80211_FD_BCASTPRESP_ATTR_TMPL: FILS discovery/bcast probe resp template
+ *
+ * @__NL80211_FD_BCASTPRESP_ATTR_LAST: Internal
+ * @NL80211_FD_BCASTPRESP_ATTR_MAX: highest FD/bcast probe resp attribute
+ */
+enum nl80211_fd_bcastpresp_attributes {
+	__NL80211_FD_BCASTPRESP_ATTR_INVALID,
+
+	NL80211_FD_BCASTPRESP_ATTR_TYPE,
+	NL80211_FD_BCASTPRESP_ATTR_INT,
+	NL80211_FD_BCASTPRESP_ATTR_TMPL,
+
+	/* keep last */
+	__NL80211_FD_BCASTPRESP_ATTR_LAST,
+	NL80211_FD_BCASTPRESP_ATTR_MAX = __NL80211_FD_BCASTPRESP_ATTR_LAST - 1
+};
+
 #endif /* __LINUX_NL80211_H */
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index 3d27b24c68b2..da61344c8ca3 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -331,6 +331,14 @@ he_bss_color_policy[NL80211_HE_BSS_COLOR_ATTR_MAX + 1] = {
 	[NL80211_HE_BSS_COLOR_ATTR_PARTIAL] = { .type = NLA_FLAG },
 };
 
+static const struct nla_policy
+fd_bcastpresp_policy[NL80211_FD_BCASTPRESP_ATTR_MAX + 1] = {
+	[NL80211_FD_BCASTPRESP_ATTR_TYPE] = NLA_POLICY_RANGE(NLA_U8, 1, 2),
+	[NL80211_FD_BCASTPRESP_ATTR_INT] = NLA_POLICY_MAX(NLA_U32, 20),
+	[NL80211_FD_BCASTPRESP_ATTR_TMPL] = { .type = NLA_BINARY,
+					      .len = IEEE80211_MAX_DATA_LEN },
+};
+
 static const struct nla_policy
 nl80211_tid_config_attr_policy[NL80211_TID_CONFIG_ATTR_MAX + 1] = {
 	[NL80211_TID_CONFIG_ATTR_VIF_SUPP] = { .type = NLA_U64 },
@@ -662,6 +670,8 @@ const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
 	[NL80211_ATTR_PMK_LIFETIME] = NLA_POLICY_MIN(NLA_U32, 1),
 	[NL80211_ATTR_PMK_REAUTH_THRESHOLD] = NLA_POLICY_RANGE(NLA_U8, 1, 100),
 	[NL80211_ATTR_RECEIVE_MULTICAST] = { .type = NLA_FLAG },
+	[NL80211_ATTR_FD_BCASTPRESP_CFG] =
+				NLA_POLICY_NESTED(fd_bcastpresp_policy),
 };
 
 /* policy for the key attributes */
@@ -4725,6 +4735,48 @@ static int nl80211_parse_he_bss_color(struct nlattr *attrs,
 	return 0;
 }
 
+static int nl80211_parse_fd_bcastpresp(struct genl_info *info,
+				       struct cfg80211_ap_settings *params)
+{
+	struct nlattr *tmpl;
+	struct nlattr *tb[NL80211_FD_BCASTPRESP_ATTR_MAX + 1];
+	int ret;
+	struct cfg80211_beacon_data *beacon = &params->beacon;
+	struct cfg80211_fd_bcastpresp *cfg;
+
+	if (params->chandef.center_freq1 <= 5940 &&
+	    params->chandef.center_freq1 >= 7105)
+		return -EOPNOTSUPP;
+
+	ret = nla_parse_nested(tb, NL80211_FD_BCASTPRESP_ATTR_MAX,
+			       info->attrs[NL80211_ATTR_FD_BCASTPRESP_CFG],
+			       fd_bcastpresp_policy, NULL);
+	if (ret)
+		return ret;
+
+	if (!tb[NL80211_FD_BCASTPRESP_ATTR_TYPE] ||
+	    !tb[NL80211_FD_BCASTPRESP_ATTR_INT])
+		return -EINVAL;
+
+	cfg = &params->fd_bcastpresp;
+	cfg->type = nla_get_u8(tb[NL80211_FD_BCASTPRESP_ATTR_TYPE]);
+	cfg->interval = nla_get_u32(tb[NL80211_FD_BCASTPRESP_ATTR_INT]);
+
+	tmpl = tb[NL80211_FD_BCASTPRESP_ATTR_TMPL];
+	if (!tmpl && !beacon->fils_disc_len && !beacon->bcast_presp_len)
+		return -EINVAL;
+
+	if (cfg->type == CFG80211_TYPE_FILS_DISCOVERY) {
+		beacon->fils_disc = nla_data(tmpl);
+		beacon->fils_disc_len = nla_len(tmpl);
+	} else if (cfg->type == CFG80211_TYPE_BCAST_PROBE_RESP) {
+		beacon->bcast_presp = nla_data(tmpl);
+		beacon->bcast_presp_len = nla_len(tmpl);
+	}
+
+	return 0;
+}
+
 static void nl80211_check_ap_rate_selectors(struct cfg80211_ap_settings *params,
 					    const u8 *rates)
 {
@@ -5029,6 +5081,12 @@ static int nl80211_start_ap(struct sk_buff *skb, struct genl_info *info)
 			return err;
 	}
 
+	if (info->attrs[NL80211_ATTR_FD_BCASTPRESP_CFG]) {
+		err = nl80211_parse_fd_bcastpresp(info, &params);
+		if (err)
+			return err;
+	}
+
 	nl80211_calculate_ap_params(&params);
 
 	if (info->attrs[NL80211_ATTR_EXTERNAL_AUTH_SUPPORT])
-- 
2.25.0

[PATCH 2/2] mac80211: FILS disc/bcast probe resp config

[Aloka Dixit]

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

Changes include functions to store and retrieve FILS discovery,
broadcast probe response templates, and packet interval.

Signed-off-by: Aloka Dixit <alokad@codeaurora.org>
---
 include/net/mac80211.h     | 17 ++++++++++++
 net/mac80211/cfg.c         | 57 ++++++++++++++++++++++++++++++++++++++
 net/mac80211/ieee80211_i.h |  8 ++++++
 net/mac80211/tx.c          | 30 ++++++++++++++++++++
 4 files changed, 112 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 78f7ce586287..768d6d9c47b6 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -317,6 +317,7 @@ struct ieee80211_vif_chanctx_switch {
  * @BSS_CHANGED_TWT: TWT status changed
  * @BSS_CHANGED_HE_OBSS_PD: OBSS Packet Detection status changed.
  * @BSS_CHANGED_HE_BSS_COLOR: BSS Color has changed
+ * @BSS_CHANGED_FD_BCASTPRESP: FILS Discovery/Bcast probe resp status changed.
  *
  */
 enum ieee80211_bss_change {
@@ -350,6 +351,7 @@ enum ieee80211_bss_change {
 	BSS_CHANGED_TWT			= 1<<27,
 	BSS_CHANGED_HE_OBSS_PD		= 1<<28,
 	BSS_CHANGED_HE_BSS_COLOR	= 1<<29,
+	BSS_CHANGED_FD_BCASTPRESP	= 1<<30,
 
 	/* when adding here, make sure to change ieee80211_reconfig */
 };
@@ -607,6 +609,7 @@ struct ieee80211_ftm_responder_params {
  * @he_oper: HE operation information of the AP we are connected to
  * @he_obss_pd: OBSS Packet Detection parameters.
  * @he_bss_color: BSS coloring settings, if BSS supports HE
+ * @fd_bcastpresp: FILS discovery and broadcast probe response configuration
  */
 struct ieee80211_bss_conf {
 	const u8 *bssid;
@@ -674,6 +677,7 @@ struct ieee80211_bss_conf {
 	} he_oper;
 	struct ieee80211_he_obss_pd he_obss_pd;
 	struct cfg80211_he_bss_color he_bss_color;
+	struct cfg80211_fd_bcastpresp fd_bcastpresp;
 };
 
 /**
@@ -6554,4 +6558,17 @@ u32 ieee80211_calc_tx_airtime(struct ieee80211_hw *hw,
  */
 bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable);
 
+/**
+ * ieee80211_get_fd_bcastpresp_tmpl - Get FILS disc/Bcast probe resp template.
+ * @hw: pointer obtained from ieee80211_alloc_hw().
+ * @vif: &struct ieee80211_vif pointer from the add_interface callback.
+ * @config: 1-FILS discovery, 2-Broadcast probe response.
+ *
+ * The driver is responsible for freeing the returned skb.
+ *
+ * Return: FILS discovery/broadcast probe response template. %NULL on error.
+ */
+struct sk_buff *ieee80211_get_fd_bcastpresp_tmpl(struct ieee80211_hw *hw,
+						 struct ieee80211_vif *vif,
+						 u8 config);
 #endif /* MAC80211_H */
diff --git a/net/mac80211/cfg.c b/net/mac80211/cfg.c
index 548a384b0509..234f2610256c 100644
--- a/net/mac80211/cfg.c
+++ b/net/mac80211/cfg.c
@@ -837,6 +837,43 @@ static int ieee80211_set_probe_resp(struct ieee80211_sub_if_data *sdata,
 	return 0;
 }
 
+static int ieee80211_set_fd_bcastpresp(struct ieee80211_sub_if_data *sdata,
+				       struct cfg80211_ap_settings *params)
+{
+	struct fd_bcastpresp *new, *old = NULL;
+	struct cfg80211_fd_bcastpresp *cfg;
+	struct cfg80211_beacon_data *bcn = &params->beacon;
+
+	cfg = &sdata->vif.bss_conf.fd_bcastpresp;
+	cfg->type = params->fd_bcastpresp.type;
+	cfg->interval = params->fd_bcastpresp.interval;
+
+	if (cfg->type == CFG80211_TYPE_FILS_DISCOVERY && bcn->fils_disc_len) {
+		new = kzalloc(sizeof(*new) + bcn->fils_disc_len, GFP_KERNEL);
+		if (!new)
+			return -ENOMEM;
+		new->len = bcn->fils_disc_len;
+		memcpy(new->data, bcn->fils_disc, bcn->fils_disc_len);
+		old = sdata_dereference(sdata->u.ap.fils_disc, sdata);
+		rcu_assign_pointer(sdata->u.ap.fils_disc, new);
+	} else if (cfg->type == CFG80211_TYPE_BCAST_PROBE_RESP &&
+		   bcn->bcast_presp_len) {
+		new = kzalloc(sizeof(*new) + bcn->bcast_presp_len, GFP_KERNEL);
+		if (!new)
+			return -ENOMEM;
+		new->len = bcn->bcast_presp_len;
+		memcpy(new->data, bcn->bcast_presp,
+		       bcn->bcast_presp_len);
+		old = sdata_dereference(sdata->u.ap.bcast_presp, sdata);
+		rcu_assign_pointer(sdata->u.ap.bcast_presp, new);
+	}
+
+	if (old)
+		kfree_rcu(old, rcu_head);
+
+	return 0;
+}
+
 static int ieee80211_set_ftm_responder_params(
 				struct ieee80211_sub_if_data *sdata,
 				const u8 *lci, size_t lci_len,
@@ -1103,6 +1140,16 @@ static int ieee80211_start_ap(struct wiphy *wiphy, struct net_device *dev,
 	}
 	changed |= err;
 
+	if (params->fd_bcastpresp.type) {
+		err = ieee80211_set_fd_bcastpresp(sdata, params);
+		if (err < 0) {
+			ieee80211_vif_release_channel(sdata);
+			return err;
+		} else if (err == 0) {
+			changed |= BSS_CHANGED_FD_BCASTPRESP;
+		}
+	}
+
 	err = drv_start_ap(sdata->local, sdata);
 	if (err) {
 		old = sdata_dereference(sdata->u.ap.beacon, sdata);
@@ -1158,6 +1205,7 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 	struct ieee80211_local *local = sdata->local;
 	struct beacon_data *old_beacon;
 	struct probe_resp *old_probe_resp;
+	struct fd_bcastpresp *old_bcast_probe_resp, *old_fils_disc;
 	struct cfg80211_chan_def chandef;
 
 	sdata_assert_lock(sdata);
@@ -1166,6 +1214,9 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 	if (!old_beacon)
 		return -ENOENT;
 	old_probe_resp = sdata_dereference(sdata->u.ap.probe_resp, sdata);
+	old_bcast_probe_resp = sdata_dereference(sdata->u.ap.bcast_presp,
+						 sdata);
+	old_fils_disc = sdata_dereference(sdata->u.ap.fils_disc, sdata);
 
 	/* abort any running channel switch */
 	mutex_lock(&local->mtx);
@@ -1189,9 +1240,15 @@ static int ieee80211_stop_ap(struct wiphy *wiphy, struct net_device *dev)
 	/* remove beacon and probe response */
 	RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 	RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
+	RCU_INIT_POINTER(sdata->u.ap.bcast_presp, NULL);
+	RCU_INIT_POINTER(sdata->u.ap.fils_disc, NULL);
 	kfree_rcu(old_beacon, rcu_head);
 	if (old_probe_resp)
 		kfree_rcu(old_probe_resp, rcu_head);
+	if (old_bcast_probe_resp)
+		kfree_rcu(old_bcast_probe_resp, rcu_head);
+	if (old_fils_disc)
+		kfree_rcu(old_fils_disc, rcu_head);
 
 	kfree(sdata->vif.bss_conf.ftmr_params);
 	sdata->vif.bss_conf.ftmr_params = NULL;
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index 8cbae66b5cdb..f9c77dbeb29a 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -270,6 +270,12 @@ struct probe_resp {
 	u8 data[0];
 };
 
+struct fd_bcastpresp {
+	struct rcu_head rcu_head;
+	int len;
+	u8 data[0];
+};
+
 struct ps_data {
 	/* yes, this looks ugly, but guarantees that we can later use
 	 * bitmap_empty :)
@@ -285,6 +291,8 @@ struct ps_data {
 struct ieee80211_if_ap {
 	struct beacon_data __rcu *beacon;
 	struct probe_resp __rcu *probe_resp;
+	struct fd_bcastpresp __rcu *bcast_presp;
+	struct fd_bcastpresp __rcu *fils_disc;
 
 	/* to be used after channel switch. */
 	struct cfg80211_beacon_data *next_beacon;
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 6dad67eb60b2..6dacd58d956d 100644
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -4984,6 +4984,36 @@ struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
 }
 EXPORT_SYMBOL(ieee80211_proberesp_get);
 
+struct sk_buff *ieee80211_get_fd_bcastpresp_tmpl(struct ieee80211_hw *hw,
+						 struct ieee80211_vif *vif,
+						 u8 config)
+{
+	struct sk_buff *skb = NULL;
+	struct fd_bcastpresp *tmpl = NULL;
+	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
+
+	if (sdata->vif.type != NL80211_IFTYPE_AP)
+		return NULL;
+
+	rcu_read_lock();
+
+	if (config == CFG80211_TYPE_FILS_DISCOVERY)
+		tmpl = rcu_dereference(sdata->u.ap.fils_disc);
+	else if (config == CFG80211_TYPE_BCAST_PROBE_RESP)
+		tmpl = rcu_dereference(sdata->u.ap.bcast_presp);
+
+	if (!tmpl || !tmpl->len)
+		goto out;
+
+	skb = dev_alloc_skb(tmpl->len);
+	if (skb)
+		skb_put_data(skb, tmpl->data, tmpl->len);
+out:
+	rcu_read_unlock();
+	return skb;
+}
+EXPORT_SYMBOL(ieee80211_get_fd_bcastpresp_tmpl);
+
 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
 				     struct ieee80211_vif *vif)
 {
-- 
2.25.0

Re: [PATCH 1/2] nl80211: FILS discovery/bcast probe resp support

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 3367 bytes --]

Hi Aloka,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on mac80211-next/master]
[also build test WARNING on next-20200522]
[cannot apply to mac80211/master v5.7-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Aloka-Dixit/FILS-discovery-and-bcast-probe-resp-support/20200523-062228
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git master
config: arm-randconfig-r024-20200524 (attached as .config)
compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 3393cc4cebf9969db94dc424b7a2b6195589c33b)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> net/wireless/nl80211.c:4747:43: warning: overlapping comparisons always evaluate to false [-Wtautological-overlap-compare]
if (params->chandef.center_freq1 <= 5940 &&
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~
1 warning generated.

vim +4747 net/wireless/nl80211.c

  4737	
  4738	static int nl80211_parse_fd_bcastpresp(struct genl_info *info,
  4739					       struct cfg80211_ap_settings *params)
  4740	{
  4741		struct nlattr *tmpl;
  4742		struct nlattr *tb[NL80211_FD_BCASTPRESP_ATTR_MAX + 1];
  4743		int ret;
  4744		struct cfg80211_beacon_data *beacon = &params->beacon;
  4745		struct cfg80211_fd_bcastpresp *cfg;
  4746	
> 4747		if (params->chandef.center_freq1 <= 5940 &&
  4748		    params->chandef.center_freq1 >= 7105)
  4749			return -EOPNOTSUPP;
  4750	
  4751		ret = nla_parse_nested(tb, NL80211_FD_BCASTPRESP_ATTR_MAX,
  4752				       info->attrs[NL80211_ATTR_FD_BCASTPRESP_CFG],
  4753				       fd_bcastpresp_policy, NULL);
  4754		if (ret)
  4755			return ret;
  4756	
  4757		if (!tb[NL80211_FD_BCASTPRESP_ATTR_TYPE] ||
  4758		    !tb[NL80211_FD_BCASTPRESP_ATTR_INT])
  4759			return -EINVAL;
  4760	
  4761		cfg = &params->fd_bcastpresp;
  4762		cfg->type = nla_get_u8(tb[NL80211_FD_BCASTPRESP_ATTR_TYPE]);
  4763		cfg->interval = nla_get_u32(tb[NL80211_FD_BCASTPRESP_ATTR_INT]);
  4764	
  4765		tmpl = tb[NL80211_FD_BCASTPRESP_ATTR_TMPL];
  4766		if (!tmpl && !beacon->fils_disc_len && !beacon->bcast_presp_len)
  4767			return -EINVAL;
  4768	
  4769		if (cfg->type == CFG80211_TYPE_FILS_DISCOVERY) {
  4770			beacon->fils_disc = nla_data(tmpl);
  4771			beacon->fils_disc_len = nla_len(tmpl);
  4772		} else if (cfg->type == CFG80211_TYPE_BCAST_PROBE_RESP) {
  4773			beacon->bcast_presp = nla_data(tmpl);
  4774			beacon->bcast_presp_len = nla_len(tmpl);
  4775		}
  4776	
  4777		return 0;
  4778	}
  4779	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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Re: [PATCH 1/2] nl80211: FILS discovery/bcast probe resp support

[Dan Carpenter]

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Hi Aloka,

url:    https://github.com/0day-ci/linux/commits/Aloka-Dixit/FILS-discovery-and-bcast-probe-resp-support/20200523-062228
base:   https://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next.git master

config: x86_64-defconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
net/wireless/nl80211.c:4771 nl80211_parse_fd_bcastpresp() error: we previously assumed 'tmpl' could be null (see line 4766)

# https://github.com/0day-ci/linux/commit/d7497e63c41decf82e86f11b0691e47e24b11122
git remote add linux-review https://github.com/0day-ci/linux
git remote update linux-review
git checkout d7497e63c41decf82e86f11b0691e47e24b11122
vim +/tmpl +4771 net/wireless/nl80211.c

d7497e63c41dec Aloka Dixit  2020-05-22  4738  static int nl80211_parse_fd_bcastpresp(struct genl_info *info,
d7497e63c41dec Aloka Dixit  2020-05-22  4739  				       struct cfg80211_ap_settings *params)
d7497e63c41dec Aloka Dixit  2020-05-22  4740  {
d7497e63c41dec Aloka Dixit  2020-05-22  4741  	struct nlattr *tmpl;
d7497e63c41dec Aloka Dixit  2020-05-22  4742  	struct nlattr *tb[NL80211_FD_BCASTPRESP_ATTR_MAX + 1];
d7497e63c41dec Aloka Dixit  2020-05-22  4743  	int ret;
d7497e63c41dec Aloka Dixit  2020-05-22  4744  	struct cfg80211_beacon_data *beacon = &params->beacon;
d7497e63c41dec Aloka Dixit  2020-05-22  4745  	struct cfg80211_fd_bcastpresp *cfg;
d7497e63c41dec Aloka Dixit  2020-05-22  4746  
d7497e63c41dec Aloka Dixit  2020-05-22  4747  	if (params->chandef.center_freq1 <= 5940 &&
d7497e63c41dec Aloka Dixit  2020-05-22  4748  	    params->chandef.center_freq1 >= 7105)
d7497e63c41dec Aloka Dixit  2020-05-22  4749  		return -EOPNOTSUPP;
d7497e63c41dec Aloka Dixit  2020-05-22  4750  
d7497e63c41dec Aloka Dixit  2020-05-22  4751  	ret = nla_parse_nested(tb, NL80211_FD_BCASTPRESP_ATTR_MAX,
d7497e63c41dec Aloka Dixit  2020-05-22  4752  			       info->attrs[NL80211_ATTR_FD_BCASTPRESP_CFG],
d7497e63c41dec Aloka Dixit  2020-05-22  4753  			       fd_bcastpresp_policy, NULL);
d7497e63c41dec Aloka Dixit  2020-05-22  4754  	if (ret)
d7497e63c41dec Aloka Dixit  2020-05-22  4755  		return ret;
d7497e63c41dec Aloka Dixit  2020-05-22  4756  
d7497e63c41dec Aloka Dixit  2020-05-22  4757  	if (!tb[NL80211_FD_BCASTPRESP_ATTR_TYPE] ||
d7497e63c41dec Aloka Dixit  2020-05-22  4758  	    !tb[NL80211_FD_BCASTPRESP_ATTR_INT])
d7497e63c41dec Aloka Dixit  2020-05-22  4759  		return -EINVAL;
d7497e63c41dec Aloka Dixit  2020-05-22  4760  
d7497e63c41dec Aloka Dixit  2020-05-22  4761  	cfg = &params->fd_bcastpresp;
d7497e63c41dec Aloka Dixit  2020-05-22  4762  	cfg->type = nla_get_u8(tb[NL80211_FD_BCASTPRESP_ATTR_TYPE]);
d7497e63c41dec Aloka Dixit  2020-05-22  4763  	cfg->interval = nla_get_u32(tb[NL80211_FD_BCASTPRESP_ATTR_INT]);
d7497e63c41dec Aloka Dixit  2020-05-22  4764  
d7497e63c41dec Aloka Dixit  2020-05-22  4765  	tmpl = tb[NL80211_FD_BCASTPRESP_ATTR_TMPL];
d7497e63c41dec Aloka Dixit  2020-05-22 @4766  	if (!tmpl && !beacon->fils_disc_len && !beacon->bcast_presp_len)

Should the && be ||?

d7497e63c41dec Aloka Dixit  2020-05-22  4767  		return -EINVAL;
d7497e63c41dec Aloka Dixit  2020-05-22  4768  
d7497e63c41dec Aloka Dixit  2020-05-22  4769  	if (cfg->type == CFG80211_TYPE_FILS_DISCOVERY) {
d7497e63c41dec Aloka Dixit  2020-05-22  4770  		beacon->fils_disc = nla_data(tmpl);
d7497e63c41dec Aloka Dixit  2020-05-22 @4771  		beacon->fils_disc_len = nla_len(tmpl);
                                                                                        ^^^^
Unchecked dereference.

d7497e63c41dec Aloka Dixit  2020-05-22  4772  	} else if (cfg->type == CFG80211_TYPE_BCAST_PROBE_RESP) {
d7497e63c41dec Aloka Dixit  2020-05-22  4773  		beacon->bcast_presp = nla_data(tmpl);
d7497e63c41dec Aloka Dixit  2020-05-22  4774  		beacon->bcast_presp_len = nla_len(tmpl);
d7497e63c41dec Aloka Dixit  2020-05-22  4775  	}
d7497e63c41dec Aloka Dixit  2020-05-22  4776  
d7497e63c41dec Aloka Dixit  2020-05-22  4777  	return 0;
d7497e63c41dec Aloka Dixit  2020-05-22  4778  }

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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