2023-10-27 07:37:52 +00:00
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From: David Bauer <mail@david-bauer.net>
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To: hostap@lists.infradead.org
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Cc: =?utf-8?q?=C3=89tienne_Morice?= <neon.emorice@mail.com>
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Subject: [PATCH] nl80211: add extra-ies only if allowed by driver
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Date: Sun, 30 Jan 2022 20:22:00 +0100
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Message-Id: <20220130192200.10883-1-mail@david-bauer.net>
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List-Id: <hostap.lists.infradead.org>
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Upgrading wpa_supplicant from 2.9 to 2.10 breaks broadcom-wl
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based adapters. The reason for it is hostapd tries to install additional
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IEs for scanning while the driver does not support this.
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The kernel indicates the maximum number of bytes for additional scan IEs
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using the NL80211_ATTR_MAX_SCAN_IE_LEN attribute. Save this value and
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only add additional scan IEs in case the driver can accommodate these
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additional IEs.
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Reported-by: Étienne Morice <neon.emorice@mail.com>
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Tested-by: Étienne Morice <neon.emorice@mail.com>
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Signed-off-by: David Bauer <mail@david-bauer.net>
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---
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src/drivers/driver.h | 3 +++
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src/drivers/driver_nl80211_capa.c | 4 ++++
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src/drivers/driver_nl80211_scan.c | 2 +-
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3 files changed, 8 insertions(+), 1 deletion(-)
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--- a/src/drivers/driver.h
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+++ b/src/drivers/driver.h
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2024-04-04 11:19:49 +00:00
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@@ -2340,6 +2340,9 @@ struct wpa_driver_capa {
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2023-10-27 07:37:52 +00:00
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/** Maximum number of iterations in a single scan plan */
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u32 max_sched_scan_plan_iterations;
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+ /** Maximum number of extra IE bytes for scans */
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+ u16 max_scan_ie_len;
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+
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/** Whether sched_scan (offloaded scanning) is supported */
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int sched_scan_supported;
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--- a/src/drivers/driver_nl80211_capa.c
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+++ b/src/drivers/driver_nl80211_capa.c
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2024-02-10 21:10:08 +00:00
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@@ -972,6 +972,10 @@ static int wiphy_info_handler(struct nl_
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2023-10-27 07:37:52 +00:00
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nla_get_u32(tb[NL80211_ATTR_MAX_SCAN_PLAN_ITERATIONS]);
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}
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+ if (tb[NL80211_ATTR_MAX_SCAN_IE_LEN])
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+ capa->max_scan_ie_len =
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+ nla_get_u16(tb[NL80211_ATTR_MAX_SCAN_IE_LEN]);
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+
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if (tb[NL80211_ATTR_MAX_MATCH_SETS])
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capa->max_match_sets =
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nla_get_u8(tb[NL80211_ATTR_MAX_MATCH_SETS]);
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--- a/src/drivers/driver_nl80211_scan.c
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+++ b/src/drivers/driver_nl80211_scan.c
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2024-02-10 21:10:08 +00:00
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@@ -221,7 +221,7 @@ nl80211_scan_common(struct i802_bss *bss
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2023-10-27 07:37:52 +00:00
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wpa_printf(MSG_DEBUG, "nl80211: Passive scan requested");
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}
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- if (params->extra_ies) {
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+ if (params->extra_ies && drv->capa.max_scan_ie_len >= params->extra_ies_len) {
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wpa_hexdump(MSG_MSGDUMP, "nl80211: Scan extra IEs",
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params->extra_ies, params->extra_ies_len);
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if (nla_put(msg, NL80211_ATTR_IE, params->extra_ies_len,
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