1 /*
2  * BSS table
3  * Copyright (c) 2009-2019, Jouni Malinen <j@w1.fi>
4  *
5  * This software may be distributed under the terms of the BSD license.
6  * See README for more details.
7  */
8 
9 #ifndef BSS_H
10 #define BSS_H
11 
12 struct wpa_scan_res;
13 
14 #define WPA_BSS_QUAL_INVALID		BIT(0)
15 #define WPA_BSS_NOISE_INVALID		BIT(1)
16 #define WPA_BSS_LEVEL_INVALID		BIT(2)
17 #define WPA_BSS_LEVEL_DBM		BIT(3)
18 #define WPA_BSS_AUTHENTICATED		BIT(4)
19 #define WPA_BSS_ASSOCIATED		BIT(5)
20 #define WPA_BSS_ANQP_FETCH_TRIED	BIT(6)
21 
22 struct wpa_bss_anqp_elem {
23 	struct dl_list list;
24 	u16 infoid;
25 	struct wpabuf *payload;
26 };
27 
28 /**
29  * struct wpa_bss_anqp - ANQP data for a BSS entry (struct wpa_bss)
30  */
31 struct wpa_bss_anqp {
32 	/** Number of BSS entries referring to this ANQP data instance */
33 	unsigned int users;
34 #ifdef CONFIG_INTERWORKING
35 	struct wpabuf *capability_list;
36 	struct wpabuf *venue_name;
37 	struct wpabuf *network_auth_type;
38 	struct wpabuf *roaming_consortium;
39 	struct wpabuf *ip_addr_type_availability;
40 	struct wpabuf *nai_realm;
41 	struct wpabuf *anqp_3gpp;
42 	struct wpabuf *domain_name;
43 	struct wpabuf *fils_realm_info;
44 	struct dl_list anqp_elems; /* list of struct wpa_bss_anqp_elem */
45 #endif /* CONFIG_INTERWORKING */
46 #ifdef CONFIG_HS20
47 	struct wpabuf *hs20_capability_list;
48 	struct wpabuf *hs20_operator_friendly_name;
49 	struct wpabuf *hs20_wan_metrics;
50 	struct wpabuf *hs20_connection_capability;
51 	struct wpabuf *hs20_operating_class;
52 	struct wpabuf *hs20_osu_providers_list;
53 	struct wpabuf *hs20_operator_icon_metadata;
54 	struct wpabuf *hs20_osu_providers_nai_list;
55 #endif /* CONFIG_HS20 */
56 };
57 
58 /**
59  * struct wpa_bss - BSS table
60  *
61  * This structure is used to store information about neighboring BSSes in
62  * generic format. It is mainly updated based on scan results from the driver.
63  */
64 struct wpa_bss {
65 	/** List entry for struct wpa_supplicant::bss */
66 	struct dl_list list;
67 	/** List entry for struct wpa_supplicant::bss_id */
68 	struct dl_list list_id;
69 	/** Unique identifier for this BSS entry */
70 	unsigned int id;
71 	/** Number of counts without seeing this BSS */
72 	unsigned int scan_miss_count;
73 	/** Index of the last scan update */
74 	unsigned int last_update_idx;
75 	/** Information flags about the BSS/IBSS (WPA_BSS_*) */
76 	unsigned int flags;
77 	/** BSSID */
78 	u8 bssid[ETH_ALEN];
79 	/** HESSID */
80 	u8 hessid[ETH_ALEN];
81 	/** SSID */
82 	u8 ssid[SSID_MAX_LEN];
83 	/** Length of SSID */
84 	size_t ssid_len;
85 	/** Frequency of the channel in MHz (e.g., 2412 = channel 1) */
86 	int freq;
87 	/** Beacon interval in TUs (host byte order) */
88 	u16 beacon_int;
89 	/** Capability information field in host byte order */
90 	u16 caps;
91 	/** Signal quality */
92 	int qual;
93 	/** Noise level */
94 	int noise;
95 	/** Signal level */
96 	int level;
97 	/** Timestamp of last Beacon/Probe Response frame */
98 	u64 tsf;
99 	/** Time of the last update (i.e., Beacon or Probe Response RX) */
100 	struct os_reltime last_update;
101 	/** Estimated throughput in kbps */
102 	unsigned int est_throughput;
103 	/** Signal-to-noise ratio in dB */
104 	int snr;
105 	/** ANQP data */
106 	struct wpa_bss_anqp *anqp;
107 	/** Length of the following IE field in octets (from Probe Response) */
108 	size_t ie_len;
109 	/** Length of the following Beacon IE field in octets */
110 	size_t beacon_ie_len;
111 	/* followed by ie_len octets of IEs */
112 	/* followed by beacon_ie_len octets of IEs */
113 };
114 
115 void wpa_bss_update_start(struct wpa_supplicant *wpa_s);
116 void wpa_bss_update_scan_res(struct wpa_supplicant *wpa_s,
117 			     struct wpa_scan_res *res,
118 			     struct os_reltime *fetch_time);
119 void wpa_bss_remove(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
120 		    const char *reason);
121 void wpa_bss_update_end(struct wpa_supplicant *wpa_s, struct scan_info *info,
122 			int new_scan);
123 int wpa_bss_init(struct wpa_supplicant *wpa_s);
124 void wpa_bss_deinit(struct wpa_supplicant *wpa_s);
125 void wpa_bss_flush(struct wpa_supplicant *wpa_s);
126 void wpa_bss_flush_by_age(struct wpa_supplicant *wpa_s, int age);
127 struct wpa_bss * wpa_bss_get(struct wpa_supplicant *wpa_s, const u8 *bssid,
128 			     const u8 *ssid, size_t ssid_len);
129 struct wpa_bss * wpa_bss_get_bssid(struct wpa_supplicant *wpa_s,
130 				   const u8 *bssid);
131 struct wpa_bss * wpa_bss_get_bssid_latest(struct wpa_supplicant *wpa_s,
132 					  const u8 *bssid);
133 struct wpa_bss * wpa_bss_get_p2p_dev_addr(struct wpa_supplicant *wpa_s,
134 					  const u8 *dev_addr);
135 struct wpa_bss * wpa_bss_get_id(struct wpa_supplicant *wpa_s, unsigned int id);
136 struct wpa_bss * wpa_bss_get_id_range(struct wpa_supplicant *wpa_s,
137 				      unsigned int idf, unsigned int idl);
138 const u8 * wpa_bss_get_ie(const struct wpa_bss *bss, u8 ie);
139 const u8 * wpa_bss_get_vendor_ie(const struct wpa_bss *bss, u32 vendor_type);
140 const u8 * wpa_bss_get_vendor_ie_beacon(const struct wpa_bss *bss,
141 					u32 vendor_type);
142 struct wpabuf * wpa_bss_get_vendor_ie_multi(const struct wpa_bss *bss,
143 					    u32 vendor_type);
144 struct wpabuf * wpa_bss_get_vendor_ie_multi_beacon(const struct wpa_bss *bss,
145 						   u32 vendor_type);
146 int wpa_bss_get_max_rate(const struct wpa_bss *bss);
147 int wpa_bss_get_bit_rates(const struct wpa_bss *bss, u8 **rates);
148 struct wpa_bss_anqp * wpa_bss_anqp_alloc(void);
149 int wpa_bss_anqp_unshare_alloc(struct wpa_bss *bss);
150 const u8 * wpa_bss_get_fils_cache_id(struct wpa_bss *bss);
151 int wpa_bss_ext_capab(const struct wpa_bss *bss, unsigned int capab);
152 
bss_is_dmg(const struct wpa_bss * bss)153 static inline int bss_is_dmg(const struct wpa_bss *bss)
154 {
155 	return bss->freq > 45000;
156 }
157 
158 /**
159  * Test whether a BSS is a PBSS.
160  * This checks whether a BSS is a DMG-band PBSS. PBSS is used for P2P DMG
161  * network.
162  */
bss_is_pbss(struct wpa_bss * bss)163 static inline int bss_is_pbss(struct wpa_bss *bss)
164 {
165 	return bss_is_dmg(bss) &&
166 		(bss->caps & IEEE80211_CAP_DMG_MASK) == IEEE80211_CAP_DMG_PBSS;
167 }
168 
wpa_bss_update_level(struct wpa_bss * bss,int new_level)169 static inline void wpa_bss_update_level(struct wpa_bss *bss, int new_level)
170 {
171 	if (bss != NULL && new_level < 0)
172 		bss->level = new_level;
173 }
174 
175 void calculate_update_time(const struct os_reltime *fetch_time,
176 			   unsigned int age_ms,
177 			   struct os_reltime *update_time);
178 
179 #endif /* BSS_H */
180