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107 lines
4.1 KiB
Diff
107 lines
4.1 KiB
Diff
From 71b061b8a13791a1ed858d924e401541c8584030 Mon Sep 17 00:00:00 2001
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From: "Arnout Vandecappelle (Essensium/Mind)" <arnout@mind.be>
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Date: Wed, 9 Jan 2019 19:08:00 +0100
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Subject: [PATCH] multi_ap: don't reject backhaul STA on fronhaul BSS
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The Multi-AP specification only specifies that information elements have
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to be added to the association requests and responses; it doesn't
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specify anything about what should be done in case they are missing.
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Currently, we reject non-backhaul associations on a backhaul-only BSS,
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and non-fronthaul associations on a fronthaul-only BSS.
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However, this makes WPS fail when fronthaul and backhaul are separate
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SSIDs. Indeed, WPS for the backhaul link is performed on the *fronthaul*
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SSID. Thus, the association request used for WPS *will* contain the
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Multi-AP IE indicating a backhaul STA. Rejecting that association makes
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WPS fail.
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Therefore, accept a multi-AP backhaul STA association request on a
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fronthaul-only BSS. Still issue a warning about it, but only at level
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DEBUG intead of INFO. Also change the condition checking to make it
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clearer.
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While we're at it, also fix the handling of unexpected bits in the
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Multi-AP IE. 4 bits are reserved in the specification, so these
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certainly have to be ignored. The specification also doesn't say that
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setting one of the other bits is not allowed. Therefore, only report
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unexpected values in the Multi-AP IE, don't reject because of it.
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Note that a malformed IE (containing more than one byte) still triggers
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a rejection.
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Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
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---
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v4: new patch
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Cfr. discussion on http://lists.infradead.org/pipermail/hostap/2019-January/039232.html
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and follow-ups.
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---
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src/ap/ieee802_11.c | 38 +++++++++++++++++++-----------------
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tests/hwsim/test_multi_ap.py | 6 ++----
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2 files changed, 22 insertions(+), 22 deletions(-)
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--- a/src/ap/ieee802_11.c
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+++ b/src/ap/ieee802_11.c
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@@ -2253,28 +2253,30 @@ static u16 check_multi_ap(struct hostapd
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}
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}
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- if (multi_ap_value == MULTI_AP_BACKHAUL_STA)
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- sta->flags |= WLAN_STA_MULTI_AP;
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-
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- if ((hapd->conf->multi_ap & BACKHAUL_BSS) &&
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- multi_ap_value == MULTI_AP_BACKHAUL_STA)
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- return WLAN_STATUS_SUCCESS;
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-
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- if (hapd->conf->multi_ap & FRONTHAUL_BSS) {
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- if (multi_ap_value == MULTI_AP_BACKHAUL_STA) {
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- hostapd_logger(hapd, sta->addr,
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- HOSTAPD_MODULE_IEEE80211,
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- HOSTAPD_LEVEL_INFO,
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- "Backhaul STA tries to associate with fronthaul-only BSS");
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- return WLAN_STATUS_ASSOC_DENIED_UNSPEC;
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- }
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- return WLAN_STATUS_SUCCESS;
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+ if (multi_ap_value && multi_ap_value != MULTI_AP_BACKHAUL_STA)
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+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
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+ HOSTAPD_LEVEL_INFO,
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+ "Multi-AP IE with unexpected value 0x%02x",
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+ multi_ap_value);
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+
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+ if (!(multi_ap_value & MULTI_AP_BACKHAUL_STA)) {
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+ if (hapd->conf->multi_ap & FRONTHAUL_BSS)
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+ return WLAN_STATUS_SUCCESS;
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+
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+ hostapd_logger(hapd, sta->addr,
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+ HOSTAPD_MODULE_IEEE80211,
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+ HOSTAPD_LEVEL_INFO,
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+ "Non-Multi-AP STA tries to associate with backhaul-only BSS");
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+ return WLAN_STATUS_ASSOC_DENIED_UNSPEC;
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}
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- hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
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- HOSTAPD_LEVEL_INFO,
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- "Non-Multi-AP STA tries to associate with backhaul-only BSS");
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- return WLAN_STATUS_ASSOC_DENIED_UNSPEC;
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+ if (!(hapd->conf->multi_ap & BACKHAUL_BSS))
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+ hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_IEEE80211,
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+ HOSTAPD_LEVEL_DEBUG,
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+ "Backhaul STA tries to associate with fronthaul-only BSS");
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+
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+ sta->flags |= WLAN_STA_MULTI_AP;
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+ return WLAN_STATUS_SUCCESS;
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}
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--- a/tests/hwsim/test_multi_ap.py
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+++ b/tests/hwsim/test_multi_ap.py
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@@ -59,7 +59,5 @@ def test_multi_ap_fronthaul_on_ap(dev, a
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dev[0].request("DISCONNECT")
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if ev is None:
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raise Exception("Connection result not reported")
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- if "CTRL-EVENT-ASSOC-REJECT" not in ev:
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- raise Exception("Association rejection not reported")
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- if "status_code=12" not in ev:
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- raise Exception("Unexpected association status code: " + ev)
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+ if "CTRL-EVENT-DISCONNECTED" not in ev:
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+ raise Exception("Unexpected connection result")
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