1/*
2 * libwebsockets - small server side websockets and web server implementation
3 *
4 * Copyright (C) 2010 - 2020 Andy Green <andy@warmcat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to
8 * deal in the Software without restriction, including without limitation the
9 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
10 * sell copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 * IN THE SOFTWARE.
23 */
24
25#define LWS_WIFI_MAX_SCAN_TRACK 16
26#define LWS_ETH_ALEN 6
27
28typedef uint8_t lws_wifi_ch_t;
29typedef int8_t lws_wifi_rssi_t;
30struct lws_netdev_instance;
31
32typedef enum {
33 LWSNDTYP_UNKNOWN,
34 LWSNDTYP_WIFI,
35 LWSNDTYP_ETH,
36} lws_netdev_type_t;
37
38/*
39 * Base class for netdev configuration
40 */
41
42typedef struct lws_netdev_config {
43 void *plat_config;
44} lws_netdev_config_t;
45
46/*
47 * Const Logical generic network interface ops
48 */
49
50typedef struct lws_netdev_ops {
51 struct lws_netdev_instance * (*create)(struct lws_context *ctx,
52 const struct lws_netdev_ops *ops,
53 const char *name, void *platinfo);
54 int (*configure)(struct lws_netdev_instance *nd,
55 lws_netdev_config_t *config);
56 int (*up)(struct lws_netdev_instance *nd);
57 int (*down)(struct lws_netdev_instance *nd);
58 int (*event)(struct lws_netdev_instance *nd, lws_usec_t timestamp,
59 void *buf, size_t len);
60 /**< these are SMD events coming from lws event loop thread context */
61 void (*destroy)(struct lws_netdev_instance **pnd);
62 int (*connect)(struct lws_netdev_instance *wnd, const char *ssid,
63 const char *passphrase, uint8_t *bssid);
64 void (*scan)(struct lws_netdev_instance *nd);
65} lws_netdev_ops_t;
66
67/*
68 * Network devices on this platform
69 *
70 * We also hold a list of all known network credentials (when they are needed
71 * because there is a network interface without anything to connect to) and
72 * the lws_settings instance they are stored in
73 */
74
75typedef struct lws_netdevs {
76 lws_dll2_owner_t owner;
77 /**< list of netdevs / lws_netdev_instance_t -based objects */
78
79 lws_dll2_owner_t owner_creds;
80 /**< list of known credentials */
81 struct lwsac *ac_creds;
82 /**< lwsac holding retreived credentials settings, or NULL */
83 lws_settings_instance_t *si;
84
85 lws_sockaddr46 sa46_dns_resolver;
86
87 uint8_t refcount_creds;
88 /**< when there are multiple netdevs, must refcount creds in mem */
89} lws_netdevs_t;
90
91/*
92 * Base class for an allocated instantiated derived object using lws_netdev_ops,
93 * ie, a specific ethernet device
94 */
95
96typedef struct lws_netdev_instance {
97 const char *name;
98 const lws_netdev_ops_t *ops;
99 void *platinfo;
100 lws_dll2_t list;
101 uint8_t mac[LWS_ETH_ALEN];
102 uint8_t type; /* lws_netdev_type_t */
103} lws_netdev_instance_t;
104
105enum {
106 LNDIW_ALG_OPEN,
107 LNDIW_ALG_WPA2,
108
109 LNDIW_MODE_STA = (1 << 0),
110 LNDIW_MODE_AP = (1 << 1),
111 LNDIW_UP = (1 << 7),
112
113 LNDIW_ACQ_IPv4 = (1 << 0),
114 LNDIW_ACQ_IPv6 = (1 << 1),
115};
116
117/*
118 * Group AP / Station State
119 */
120
121typedef enum {
122 LWSNDVWIFI_STATE_INITIAL,
123 /*
124 * We should gratuitously try whatever last worked for us, then
125 * if that fails, worry about the rest of the logic
126 */
127 LWSNDVWIFI_STATE_SCAN,
128 /*
129 * Unconnected, scanning: AP known in one of the config slots ->
130 * configure it, start timeout + LWSNDVWIFI_STATE_STAT, if no AP
131 * already up in same group with lower MAC, after a random
132 * period start up our AP (LWSNDVWIFI_STATE_AP)
133 */
134 LWSNDVWIFI_STATE_AP,
135 /* Trying to be the group AP... periodically do a scan
136 * LWSNDVWIFI_STATE_AP_SCAN, faster and then slower
137 */
138 LWSNDVWIFI_STATE_AP_SCAN,
139 /*
140 * doing a scan while trying to be the group AP... if we see a
141 * lower MAC being the AP for the same group AP, abandon being
142 * an AP and join that AP as a station
143 */
144 LWSNDVWIFI_STATE_STAT_GRP_AP,
145 /*
146 * We have decided to join another group member who is being the
147 * AP, as its MAC is lower than ours. This is a stable state,
148 * but we still do periodic scans
149 * LWSNDVWIFI_STATE_STAT_GRP_AP_SCAN and will always prefer an
150 * AP configured in a slot.
151 */
152 LWSNDVWIFI_STATE_STAT_GRP_AP_SCAN,
153 /*
154 * We have joined a group member who is doing the AP job... we
155 * want to check every now and then if a configured AP has
156 * appeared that we should better use instead. Otherwise stay
157 * in LWSNDVWIFI_STATE_STAT_GRP_AP
158 */
159 LWSNDVWIFI_STATE_STAT,
160 /*
161 * trying to connect to another non-group AP. If we don't get an
162 * IP within a timeout and retries, mark it as unusable it and go back
163 */
164 LWSNDVWIFI_STATE_STAT_HAPPY,
165} lws_netdev_wifi_state_t;
166
167/*
168 * Generic WIFI credentials
169 */
170
171typedef struct lws_wifi_creds {
172 lws_dll2_t list;
173
174 uint8_t bssid[LWS_ETH_ALEN];
175 char passphrase[64];
176 char ssid[33];
177 uint8_t alg;
178} lws_wifi_creds_t;
179
180/*
181 * Generic WIFI Network Device Instance
182 */
183
184typedef struct lws_netdev_instance_wifi {
185 lws_netdev_instance_t inst;
186 lws_dll2_owner_t scan; /* sorted scan results */
187 lws_sorted_usec_list_t sul_scan;
188
189 lws_wifi_creds_t *ap_cred;
190 const char *ap_ip;
191
192 const char *sta_ads;
193
194 char current_attempt_ssid[33];
195 uint8_t current_attempt_bssid[LWS_ETH_ALEN];
196
197 uint8_t flags;
198 uint8_t state; /* lws_netdev_wifi_state_t */
199} lws_netdev_instance_wifi_t;
200
201/*
202 * Logical scan results sorted list item
203 */
204
205typedef struct lws_wifi_sta {
206 lws_dll2_t list;
207
208 uint32_t last_seen; /* unix time */
209 uint32_t last_tried; /* unix time */
210
211 uint8_t bssid[LWS_ETH_ALEN];
212 char *ssid; /* points to overallocation */
213 uint8_t ssid_len;
214 lws_wifi_ch_t ch;
215 lws_wifi_rssi_t rssi[8];
216 int16_t rssi_avg;
217 uint8_t authmode;
218
219 uint8_t rssi_count;
220 uint8_t rssi_next;
221
222 /* ssid overallocated afterwards */
223} lws_wifi_sta_t;
224
225#define rssi_averaged(_x) (_x->rssi_count ? \
226 ((int)_x->rssi_avg / (int)_x->rssi_count) : \
227 -200)
228
229LWS_VISIBLE LWS_EXTERN lws_netdevs_t *
230lws_netdevs_from_ctx(struct lws_context *ctx);
231
232LWS_VISIBLE LWS_EXTERN int
233lws_netdev_credentials_settings_set(lws_netdevs_t *nds);
234
235LWS_VISIBLE LWS_EXTERN int
236lws_netdev_credentials_settings_get(lws_netdevs_t *nds);
237
238LWS_VISIBLE LWS_EXTERN struct lws_netdev_instance *
239lws_netdev_wifi_create_plat(struct lws_context *ctx,
240 const lws_netdev_ops_t *ops, const char *name,
241 void *platinfo);
242LWS_VISIBLE LWS_EXTERN int
243lws_netdev_wifi_configure_plat(struct lws_netdev_instance *nd,
244 lws_netdev_config_t *config);
245LWS_VISIBLE LWS_EXTERN int
246lws_netdev_wifi_event_plat(struct lws_netdev_instance *nd, lws_usec_t timestamp,
247 void *buf, size_t len);
248LWS_VISIBLE LWS_EXTERN int
249lws_netdev_wifi_up_plat(struct lws_netdev_instance *nd);
250LWS_VISIBLE LWS_EXTERN int
251lws_netdev_wifi_down_plat(struct lws_netdev_instance *nd);
252LWS_VISIBLE LWS_EXTERN void
253lws_netdev_wifi_destroy_plat(struct lws_netdev_instance **pnd);
254LWS_VISIBLE LWS_EXTERN void
255lws_netdev_wifi_scan_plat(lws_netdev_instance_t *nd);
256
257LWS_VISIBLE LWS_EXTERN int
258lws_netdev_wifi_connect_plat(lws_netdev_instance_t *wnd, const char *ssid,
259 const char *passphrase, uint8_t *bssid);
260
261LWS_VISIBLE LWS_EXTERN lws_netdev_instance_t *
262lws_netdev_find(lws_netdevs_t *netdevs, const char *ifname);
263
264#define lws_netdev_wifi_plat_ops \
265 .create = lws_netdev_wifi_create_plat, \
266 .configure = lws_netdev_wifi_configure_plat, \
267 .event = lws_netdev_wifi_event_plat, \
268 .up = lws_netdev_wifi_up_plat, \
269 .down = lws_netdev_wifi_down_plat, \
270 .connect = lws_netdev_wifi_connect_plat, \
271 .scan = lws_netdev_wifi_scan_plat, \
272 .destroy = lws_netdev_wifi_destroy_plat
273
274/*
275 * This is for plat / OS level init that is necessary to be able to use
276 * networking or wifi at all, without mentioning any specific device
277 */
278
279LWS_VISIBLE LWS_EXTERN int
280lws_netdev_plat_init(void);
281
282LWS_VISIBLE LWS_EXTERN int
283lws_netdev_plat_wifi_init(void);
284