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50 lines
1.5 KiB
Diff
50 lines
1.5 KiB
Diff
This patch fixes the detection of hidden SSIDs as transmitted
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by some cisco systems.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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--- a/net80211/ieee80211_scan_sta.c
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+++ b/net80211/ieee80211_scan_sta.c
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@@ -209,6 +209,19 @@ saveie(u_int8_t **iep, const u_int8_t *i
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ieee80211_saveie(iep, ie);
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}
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+
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+static inline int is_empty_ssid(u_int8_t *ssid)
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+{
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+ if (!ssid)
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+ return 1;
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+ if (ssid[1] == 0)
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+ return 1;
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+ if ((ssid[1] == 1) && (ssid[2] == 0))
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+ return 1;
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+ return 0;
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+}
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+
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+
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/*
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* Process a beacon or probe response frame; create an
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* entry in the scan cache or update any previous entry.
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@@ -233,8 +246,8 @@ sta_add(struct ieee80211_scan_state *ss,
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SCAN_STA_LOCK_IRQ(st);
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LIST_FOREACH(se, &st->st_hash[hash], se_hash)
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if (IEEE80211_ADDR_EQ(se->base.se_macaddr, macaddr) &&
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- sp->ssid[1] == se->base.se_ssid[1] &&
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- !memcmp(se->base.se_ssid+2, sp->ssid+2, se->base.se_ssid[1]))
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+ (is_empty_ssid(sp->ssid) || (sp->ssid[1] == se->base.se_ssid[1] &&
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+ !memcmp(se->base.se_ssid+2, sp->ssid+2, se->base.se_ssid[1]))))
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goto found;
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MALLOC(se, struct sta_entry *, sizeof(struct sta_entry),
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@@ -252,8 +265,8 @@ found:
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ise = &se->base;
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/* XXX ap beaconing multiple ssid w/ same bssid */
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- if (sp->ssid[1] != 0 &&
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- (ISPROBE(subtype) || ise->se_ssid[1] == 0))
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+ if (!is_empty_ssid(sp->ssid) &&
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+ (ISPROBE(subtype) || is_empty_ssid(ise->se_ssid)))
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memcpy(ise->se_ssid, sp->ssid, 2 + sp->ssid[1]);
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memcpy(ise->se_rates, sp->rates,
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