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c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1708006462; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=FXP2gPLBFEVoi3fyWxeX+9N2//T08FGxLjrXEVgziMc=; b=CAkj2+hmxuAnKP13edn3CL4etwko857Qu21F7Javyn60cvNa1t3TCpLbL41EPsVYYdBcB4 Z3DoiZuR8ZwVfRxVy0W/IcH3rwwC322JvsbjtAxgfhgd84QC2l2yDF/O8MiHKLebVDyVRp 1hMjOei6OK28ugswa9qHn+8rBl0iG1mhUjaZDp4L8zt0SXTh7OqyBJQB1knvgSwiykFzDk nK8/m/bzJBaMgs0M5UhuIxMoog7h+yuHERX31qiR/gEGNTqcdyCTIudbBZOAxUBnONNZYE PpR+d91fkfMSRcHO6trBdgvLtBwvaFtBYNGrA5mf3dwyj14MmsWQJ5s5p7lP0g== From: =?utf-8?q?Alexis_Lothor=C3=A9?= Date: Thu, 15 Feb 2024 15:13:52 +0100 Subject: [PATCH 1/2] wifi: nl80211: force WLAN_AKM_SUITE_SAE in big endian in NL80211_CMD_EXTERNAL_AUTH Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20240215-nl80211_fix_akm_suites_endianness-v1-1-57e902632f9d@bootlin.com> References: <20240215-nl80211_fix_akm_suites_endianness-v1-0-57e902632f9d@bootlin.com> In-Reply-To: <20240215-nl80211_fix_akm_suites_endianness-v1-0-57e902632f9d@bootlin.com> To: Johannes Berg Cc: Ajay Singh , Kalle Valo , Thomas Petazzoni , linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, Igor Mitsyanko , Sergey Matyukevich , =?utf-8?q?Alexis_Lothor=C3=A9?= X-Mailer: b4 0.12.4 X-GND-Sasl: alexis.lothore@bootlin.com User-space supplicant (observed at least on wpa_supplicant) historically parses the NL80211_ATTR_AKM_SUITES from the NL80211_CMD_EXTERNAL_AUTH message as big endian _only_ when its value is WLAN_AKM_SUITE_SAE, while processing anything else in host endian. This behavior makes any driver relying on SAE external auth to switch AKM suite to big endian if it is WLAN_AKM_SUITE_SAE. A fix bringing compatibility with both endianness has been brought into wpa_supplicant, however we must keep compatibility with older versions, while trying to reduce the occurences of this manual conversion in wireless drivers. Add the be32 conversion specifically on WLAN_AKM_SUITE_SAE in nl80211 layer to keep compatibility with older wpa_supplicant versions. Suggested-by: Johannes Berg Signed-off-by: Alexis Lothoré --- Only a few minor modifications from Johannes' initial suggestion: - fixed unbalanced parenthesis - slightly reworded the inlined documentation --- net/wireless/nl80211.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c index 5f18cbf7cc3d..046ce0513d31 100644 --- a/net/wireless/nl80211.c +++ b/net/wireless/nl80211.c @@ -20136,9 +20136,26 @@ int cfg80211_external_auth_request(struct net_device *dev, if (!hdr) goto nla_put_failure; + /* Some historical mistakes in drivers <-> userspace interface (notably + * between drivers and wpa_supplicant) led to a big-endian conversion + * being needed on NL80211_ATTR_AKM_SUITES _only_ when its value is + * WLAN_AKM_SUITE_SAE. This is now fixed on userspace side, but for the + * benefit of older wpa_supplicant versions, send this particular value + * in big-endian. Note that newer wpa_supplicant will also detect this + * particular value in big endian still, so it all continues to work. + */ + if (params->key_mgmt_suite == WLAN_AKM_SUITE_SAE) { + if (nla_put_be32(msg, NL80211_ATTR_AKM_SUITES, + cpu_to_be32(WLAN_AKM_SUITE_SAE))) + goto nla_put_failure; + } else { + if (nla_put_u32(msg, NL80211_ATTR_AKM_SUITES, + params->key_mgmt_suite)) + goto nla_put_failure; + } + if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) || nla_put_u32(msg, NL80211_ATTR_IFINDEX, dev->ifindex) || - nla_put_u32(msg, NL80211_ATTR_AKM_SUITES, params->key_mgmt_suite) || nla_put_u32(msg, NL80211_ATTR_EXTERNAL_AUTH_ACTION, params->action) || nla_put(msg, NL80211_ATTR_BSSID, ETH_ALEN, params->bssid) || -- 2.43.0