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From: Arend van Spriel <arend.vanspriel@broadcom.com>
To: Kalle Valo <kvalo@kernel.org>
Cc: linux-wireless@vger.kernel.org,
	Hector Martin <marcan@marcan.st>,
	Neal Gompa <neal@gompa.dev>,
	=?UTF-8?q?Pawe=C5=82=20Drewniak?= <czajernia@gmail.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	Arend van Spriel <arend.vanspriel@broadcom.com>
Subject: [PATCH] wifi: brcmfmac: cfg80211: Use WSEC to set SAE password
Date: Thu, 21 Dec 2023 15:04:16 +0100
Message-Id: <20231221140416.223639-1-arend.vanspriel@broadcom.com>
In-Reply-To: <20231107-brcmfmac-wpa3-v1-1-4c7db8636680@marcan.st>
References: <20231107-brcmfmac-wpa3-v1-1-4c7db8636680@marcan.st>
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--0000000000008c201c060d059320
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From: Hector Martin <marcan@marcan.st>

Using the WSEC command instead of sae_password seems to be the supported
mechanism on newer firmware, and also how the brcmdhd driver does it.

According to user reports [1], the sae_password codepath doesn't actually
work on machines with Cypress chips anyway, so no harm in removing it.

This makes WPA3 work with iwd, or with wpa_supplicant pending a support
patchset [2].

[1] https://rachelbythebay.com/w/2023/11/06/wpa3/
[2] http://lists.infradead.org/pipermail/hostap/2023-July/041653.html

Signed-off-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Paweł Drewniak <czajernia@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
[arend.vanspriel@broadcom.com: use multi-vendor framework]
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
---
Here is how the multi-vendor code could support both Cypress and
WCC mobility chips. As said it might be easier to just override
entire cfg80211 callback operations.

Regards,
Arend
---
 .../broadcom/brcm80211/brcmfmac/cfg80211.c    | 13 +++++++---
 .../broadcom/brcm80211/brcmfmac/cfg80211.h    |  3 +++
 .../broadcom/brcm80211/brcmfmac/fwil.c        |  1 +
 .../broadcom/brcm80211/brcmfmac/fwil_types.h  |  2 +-
 .../broadcom/brcm80211/brcmfmac/fwvid.h       | 14 ++++++++++
 .../broadcom/brcm80211/brcmfmac/wcc/core.c    | 26 +++++++++++++++++++
 6 files changed, 55 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 133c5ea6429c..989d0f3d4b3b 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -32,6 +32,7 @@
 #include "vendor.h"
 #include "bus.h"
 #include "common.h"
+#include "fwvid.h"
 
 #define BRCMF_SCAN_IE_LEN_MAX		2048
 
@@ -1693,6 +1694,12 @@ static int brcmf_set_pmk(struct brcmf_if *ifp, const u8 *pmk_data, u16 pmk_len)
 	struct brcmf_wsec_pmk_le pmk;
 	int err;
 
+	if (pmk_len > sizeof(pmk.key)) {
+		bphy_err(drvr, "key must be less than %zu bytes\n",
+			 sizeof(pmk.key));
+		return -EINVAL;
+	}
+
 	memset(&pmk, 0, sizeof(pmk));
 
 	/* pass pmk directly */
@@ -1710,7 +1717,7 @@ static int brcmf_set_pmk(struct brcmf_if *ifp, const u8 *pmk_data, u16 pmk_len)
 	return err;
 }
 
-static int brcmf_set_sae_password(struct brcmf_if *ifp, const u8 *pwd_data,
+int brcmf_set_sae_password(struct brcmf_if *ifp, const u8 *pwd_data,
 				  u16 pwd_len)
 {
 	struct brcmf_pub *drvr = ifp->drvr;
@@ -1734,6 +1741,7 @@ static int brcmf_set_sae_password(struct brcmf_if *ifp, const u8 *pwd_data,
 
 	return err;
 }
+BRCMF_EXPORT_SYMBOL_GPL(brcmf_set_sae_password);
 
 static void brcmf_link_down(struct brcmf_cfg80211_vif *vif, u16 reason,
 			    bool locally_generated)
@@ -2503,8 +2511,7 @@ brcmf_cfg80211_connect(struct wiphy *wiphy, struct net_device *ndev,
 			bphy_err(drvr, "failed to clean up user-space RSNE\n");
 			goto done;
 		}
-		err = brcmf_set_sae_password(ifp, sme->crypto.sae_pwd,
-					     sme->crypto.sae_pwd_len);
+		err = brcmf_fwvid_set_sae_password(ifp, &sme->crypto);
 		if (!err && sme->crypto.psk)
 			err = brcmf_set_pmk(ifp, sme->crypto.psk,
 					    BRCMF_WSEC_MAX_PSK_LEN);
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
index 0e1fa3f0dea2..7c08e545e73f 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
@@ -468,4 +468,7 @@ void brcmf_set_mpc(struct brcmf_if *ndev, int mpc);
 void brcmf_abort_scanning(struct brcmf_cfg80211_info *cfg);
 void brcmf_cfg80211_free_netdev(struct net_device *ndev);
 
+int brcmf_set_sae_password(struct brcmf_if *ifp, const u8 *pwd_data,
+			   u16 pwd_len);
+
 #endif /* BRCMFMAC_CFG80211_H */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.c
index 72fe8bce6eaf..65604477ad2f 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil.c
@@ -142,6 +142,7 @@ brcmf_fil_cmd_data_set(struct brcmf_if *ifp, u32 cmd, void *data, u32 len)
 
 	return err;
 }
+BRCMF_EXPORT_SYMBOL_GPL(brcmf_fil_cmd_data_set);
 
 s32
 brcmf_fil_cmd_data_get(struct brcmf_if *ifp, u32 cmd, void *data, u32 len)
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
index 9d248ba1c0b2..e74a23e11830 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwil_types.h
@@ -584,7 +584,7 @@ struct brcmf_wsec_key_le {
 struct brcmf_wsec_pmk_le {
 	__le16  key_len;
 	__le16  flags;
-	u8 key[2 * BRCMF_WSEC_MAX_PSK_LEN + 1];
+	u8 key[BRCMF_WSEC_MAX_SAE_PASSWORD_LEN];
 };
 
 /**
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwvid.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwvid.h
index 43df58bb70ad..6fb3b8fc398a 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwvid.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fwvid.h
@@ -6,12 +6,15 @@
 #define FWVID_H_
 
 #include "firmware.h"
+#include "cfg80211.h"
 
 struct brcmf_pub;
+struct brcmf_if;
 
 struct brcmf_fwvid_ops {
 	int (*attach)(struct brcmf_pub *drvr);
 	void (*detach)(struct brcmf_pub *drvr);
+	int (*set_sae_password)(struct brcmf_if *ifp, struct cfg80211_crypto_settings *crypto);
 };
 
 /* exported functions */
@@ -44,4 +47,15 @@ static inline void brcmf_fwvid_detach(struct brcmf_pub *drvr)
 	brcmf_fwvid_detach_ops(drvr);
 }
 
+static inline int brcmf_fwvid_set_sae_password(struct brcmf_if *ifp,
+					       struct cfg80211_crypto_settings *crypto)
+{
+	const struct brcmf_fwvid_ops *vops = ifp->drvr->vops;
+
+	if (!vops || !vops->set_sae_password)
+		return brcmf_set_sae_password(ifp, crypto->sae_pwd, crypto->sae_pwd_len);
+
+	return vops->set_sae_password(ifp, crypto);
+}
+
 #endif /* FWVID_H_ */
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/wcc/core.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/wcc/core.c
index 5573a47766ad..01025d5c137b 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/wcc/core.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/wcc/core.c
@@ -7,6 +7,7 @@
 #include <core.h>
 #include <bus.h>
 #include <fwvid.h>
+#include <fwil.h>
 
 #include "vops.h"
 
@@ -21,7 +22,32 @@ static void brcmf_wcc_detach(struct brcmf_pub *drvr)
 	pr_debug("%s: executing\n", __func__);
 }
 
+static int brcmf_wcc_set_sae_pwd(struct brcmf_if *ifp,
+				 struct cfg80211_crypto_settings *crypto)
+{
+	struct brcmf_pub *drvr = ifp->drvr;
+	struct brcmf_wsec_pmk_le pmk;
+	int err;
+
+	memset(&pmk, 0, sizeof(pmk));
+
+	/* pass pmk directly */
+	pmk.key_len = cpu_to_le16(crypto->sae_pwd_len);
+	pmk.flags = cpu_to_le16(BRCMF_WSEC_PASSPHRASE);
+	memcpy(pmk.key, crypto->sae_pwd, crypto->sae_pwd_len);
+
+	/* store psk in firmware */
+	err = brcmf_fil_cmd_data_set(ifp, BRCMF_C_SET_WSEC_PMK,
+				     &pmk, sizeof(pmk));
+	if (err < 0)
+		bphy_err(drvr, "failed to change PSK in firmware (len=%u)\n",
+			 crypto->sae_pwd_len);
+
+	return err;
+}
+
 const struct brcmf_fwvid_ops brcmf_wcc_ops = {
 	.attach = brcmf_wcc_attach,
 	.detach = brcmf_wcc_detach,
+	.set_sae_password = brcmf_wcc_set_sae_pwd,
 };
-- 
2.32.0


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