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d32d94db XC |
1 | /* |
2 | * hostapd - WNM | |
3 | * Copyright (c) 2011-2012, Qualcomm Atheros, Inc. | |
4 | * | |
5 | * This software may be distributed under the terms of the BSD license. | |
6 | * See README for more details. | |
7 | */ | |
8 | ||
9 | #include "utils/includes.h" | |
10 | ||
11 | #include "utils/common.h" | |
12 | #include "common/ieee802_11_defs.h" | |
13 | #include "ap/hostapd.h" | |
14 | #include "ap/sta_info.h" | |
15 | #include "ap/ap_config.h" | |
16 | #include "ap/ap_drv_ops.h" | |
17 | #include "ap/wpa_auth.h" | |
18 | #include "wnm_ap.h" | |
19 | ||
20 | #define MAX_TFS_IE_LEN 1024 | |
21 | ||
d32d94db XC |
22 | |
23 | /* get the TFS IE from driver */ | |
24 | static int ieee80211_11_get_tfs_ie(struct hostapd_data *hapd, const u8 *addr, | |
25 | u8 *buf, u16 *buf_len, enum wnm_oper oper) | |
26 | { | |
27 | wpa_printf(MSG_DEBUG, "%s: TFS get operation %d", __func__, oper); | |
28 | ||
29 | return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len); | |
30 | } | |
31 | ||
32 | ||
33 | /* set the TFS IE to driver */ | |
34 | static int ieee80211_11_set_tfs_ie(struct hostapd_data *hapd, const u8 *addr, | |
35 | u8 *buf, u16 *buf_len, enum wnm_oper oper) | |
36 | { | |
37 | wpa_printf(MSG_DEBUG, "%s: TFS set operation %d", __func__, oper); | |
38 | ||
39 | return hostapd_drv_wnm_oper(hapd, oper, addr, buf, buf_len); | |
40 | } | |
41 | ||
42 | ||
43 | /* MLME-SLEEPMODE.response */ | |
44 | static int ieee802_11_send_wnmsleep_resp(struct hostapd_data *hapd, | |
45 | const u8 *addr, u8 dialog_token, | |
46 | u8 action_type, u16 intval) | |
47 | { | |
48 | struct ieee80211_mgmt *mgmt; | |
49 | int res; | |
50 | size_t len; | |
51 | size_t gtk_elem_len = 0; | |
52 | size_t igtk_elem_len = 0; | |
53 | struct wnm_sleep_element wnmsleep_ie; | |
54 | u8 *wnmtfs_ie; | |
55 | u8 wnmsleep_ie_len; | |
56 | u16 wnmtfs_ie_len; | |
57 | u8 *pos; | |
58 | struct sta_info *sta; | |
59 | enum wnm_oper tfs_oper = action_type == 0 ? WNM_SLEEP_TFS_RESP_IE_ADD : | |
60 | WNM_SLEEP_TFS_RESP_IE_NONE; | |
61 | ||
62 | sta = ap_get_sta(hapd, addr); | |
63 | if (sta == NULL) { | |
64 | wpa_printf(MSG_DEBUG, "%s: station not found", __func__); | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | /* WNM-Sleep Mode IE */ | |
69 | os_memset(&wnmsleep_ie, 0, sizeof(struct wnm_sleep_element)); | |
70 | wnmsleep_ie_len = sizeof(struct wnm_sleep_element); | |
71 | wnmsleep_ie.eid = WLAN_EID_WNMSLEEP; | |
72 | wnmsleep_ie.len = wnmsleep_ie_len - 2; | |
73 | wnmsleep_ie.action_type = action_type; | |
74 | wnmsleep_ie.status = WNM_STATUS_SLEEP_ACCEPT; | |
75 | wnmsleep_ie.intval = intval; | |
76 | ||
77 | /* TFS IE(s) */ | |
78 | wnmtfs_ie = os_zalloc(MAX_TFS_IE_LEN); | |
79 | if (wnmtfs_ie == NULL) | |
80 | return -1; | |
81 | if (ieee80211_11_get_tfs_ie(hapd, addr, wnmtfs_ie, &wnmtfs_ie_len, | |
82 | tfs_oper)) { | |
83 | wnmtfs_ie_len = 0; | |
84 | os_free(wnmtfs_ie); | |
85 | wnmtfs_ie = NULL; | |
86 | } | |
87 | ||
88 | #define MAX_GTK_SUBELEM_LEN 45 | |
89 | #define MAX_IGTK_SUBELEM_LEN 26 | |
90 | mgmt = os_zalloc(sizeof(*mgmt) + wnmsleep_ie_len + | |
91 | MAX_GTK_SUBELEM_LEN + MAX_IGTK_SUBELEM_LEN); | |
92 | if (mgmt == NULL) { | |
93 | wpa_printf(MSG_DEBUG, "MLME: Failed to allocate buffer for " | |
94 | "WNM-Sleep Response action frame"); | |
95 | return -1; | |
96 | } | |
97 | os_memcpy(mgmt->da, addr, ETH_ALEN); | |
98 | os_memcpy(mgmt->sa, hapd->own_addr, ETH_ALEN); | |
99 | os_memcpy(mgmt->bssid, hapd->own_addr, ETH_ALEN); | |
100 | mgmt->frame_control = IEEE80211_FC(WLAN_FC_TYPE_MGMT, | |
101 | WLAN_FC_STYPE_ACTION); | |
102 | mgmt->u.action.category = WLAN_ACTION_WNM; | |
103 | mgmt->u.action.u.wnm_sleep_resp.action = WNM_SLEEP_MODE_RESP; | |
104 | mgmt->u.action.u.wnm_sleep_resp.dialogtoken = dialog_token; | |
105 | pos = (u8 *)mgmt->u.action.u.wnm_sleep_resp.variable; | |
106 | /* add key data if MFP is enabled */ | |
107 | if (wpa_auth_uses_mfp(sta->wpa_sm) || action_type != 1){ | |
108 | mgmt->u.action.u.wnm_sleep_resp.keydata_len = 0; | |
109 | } else { | |
110 | gtk_elem_len = wpa_wnmsleep_gtk_subelem(sta->wpa_sm, pos); | |
111 | pos += gtk_elem_len; | |
112 | wpa_printf(MSG_DEBUG, "Pass 4, gtk_len = %d", | |
113 | (int) gtk_elem_len); | |
114 | #ifdef CONFIG_IEEE80211W | |
115 | res = wpa_wnmsleep_igtk_subelem(sta->wpa_sm, pos); | |
116 | if (res < 0) { | |
117 | os_free(wnmtfs_ie); | |
118 | os_free(mgmt); | |
119 | return -1; | |
120 | } | |
121 | igtk_elem_len = res; | |
122 | pos += igtk_elem_len; | |
123 | wpa_printf(MSG_DEBUG, "Pass 4 igtk_len = %d", | |
124 | (int) igtk_elem_len); | |
125 | #endif /* CONFIG_IEEE80211W */ | |
126 | ||
127 | WPA_PUT_LE16((u8 *) | |
128 | &mgmt->u.action.u.wnm_sleep_resp.keydata_len, | |
129 | gtk_elem_len + igtk_elem_len); | |
130 | } | |
131 | os_memcpy(pos, &wnmsleep_ie, wnmsleep_ie_len); | |
132 | /* copy TFS IE here */ | |
133 | pos += wnmsleep_ie_len; | |
134 | os_memcpy(pos, wnmtfs_ie, wnmtfs_ie_len); | |
135 | ||
136 | len = 1 + sizeof(mgmt->u.action.u.wnm_sleep_resp) + gtk_elem_len + | |
137 | igtk_elem_len + wnmsleep_ie_len + wnmtfs_ie_len; | |
138 | ||
139 | /* In driver, response frame should be forced to sent when STA is in | |
140 | * PS mode */ | |
141 | res = hostapd_drv_send_action(hapd, hapd->iface->freq, 0, | |
142 | mgmt->da, &mgmt->u.action.category, len); | |
143 | ||
144 | if (!res) { | |
145 | wpa_printf(MSG_DEBUG, "Successfully send WNM-Sleep Response " | |
146 | "frame"); | |
147 | ||
148 | /* when entering wnmsleep | |
149 | * 1. pause the node in driver | |
150 | * 2. mark the node so that AP won't update GTK/IGTK during | |
151 | * WNM Sleep | |
152 | */ | |
153 | if (wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT && | |
154 | wnmsleep_ie.action_type == 0) { | |
155 | hostapd_drv_wnm_oper(hapd, WNM_SLEEP_ENTER_CONFIRM, | |
156 | addr, NULL, NULL); | |
157 | wpa_set_wnmsleep(sta->wpa_sm, 1); | |
158 | } | |
159 | /* when exiting wnmsleep | |
160 | * 1. unmark the node | |
161 | * 2. start GTK/IGTK update if MFP is not used | |
162 | * 3. unpause the node in driver | |
163 | */ | |
164 | if (wnmsleep_ie.status == WNM_STATUS_SLEEP_ACCEPT && | |
165 | wnmsleep_ie.action_type == 1) { | |
166 | wpa_set_wnmsleep(sta->wpa_sm, 0); | |
167 | hostapd_drv_wnm_oper(hapd, WNM_SLEEP_EXIT_CONFIRM, | |
168 | addr, NULL, NULL); | |
169 | if (wpa_auth_uses_mfp(sta->wpa_sm) && action_type == 1) | |
170 | wpa_wnmsleep_rekey_gtk(sta->wpa_sm); | |
171 | } | |
172 | } else | |
173 | wpa_printf(MSG_DEBUG, "Fail to send WNM-Sleep Response frame"); | |
174 | ||
175 | #undef MAX_GTK_SUBELEM_LEN | |
176 | #undef MAX_IGTK_SUBELEM_LEN | |
177 | os_free(wnmtfs_ie); | |
178 | os_free(mgmt); | |
179 | return res; | |
180 | } | |
181 | ||
182 | ||
183 | static void ieee802_11_rx_wnmsleep_req(struct hostapd_data *hapd, | |
184 | const u8 *addr, const u8 *frm, int len) | |
185 | { | |
186 | /* | |
187 | * Action [1] | Dialog Token [1] | WNM-Sleep Mode IE | | |
188 | * TFS Response IE | |
189 | */ | |
190 | u8 *pos = (u8 *) frm; /* point to action field */ | |
191 | u8 dialog_token = pos[1]; | |
192 | struct wnm_sleep_element *wnmsleep_ie = NULL; | |
193 | /* multiple TFS Req IE (assuming consecutive) */ | |
194 | u8 *tfsreq_ie_start = NULL; | |
195 | u8 *tfsreq_ie_end = NULL; | |
196 | u16 tfsreq_ie_len = 0; | |
197 | ||
198 | pos += 1 + 1; | |
199 | while (pos - frm < len - 1) { | |
200 | u8 ie_len = *(pos+1); | |
201 | if (*pos == WLAN_EID_WNMSLEEP) | |
202 | wnmsleep_ie = (struct wnm_sleep_element *)pos; | |
203 | else if (*pos == WLAN_EID_TFS_REQ) { | |
204 | if (!tfsreq_ie_start) | |
205 | tfsreq_ie_start = pos; | |
206 | tfsreq_ie_end = pos; | |
207 | } else | |
208 | wpa_printf(MSG_DEBUG, "EID %d not recognized", *pos); | |
209 | pos += ie_len + 2; | |
210 | } | |
211 | ||
212 | if (!wnmsleep_ie) { | |
213 | wpa_printf(MSG_DEBUG, "No WNM-Sleep IE found"); | |
214 | return; | |
215 | } | |
216 | ||
217 | if (wnmsleep_ie->action_type == 0 && tfsreq_ie_start && | |
218 | tfsreq_ie_end && tfsreq_ie_end - tfsreq_ie_start >= 0) { | |
219 | tfsreq_ie_len = (tfsreq_ie_end + tfsreq_ie_end[1] + 2) - | |
220 | tfsreq_ie_start; | |
221 | wpa_printf(MSG_DEBUG, "TFS Req IE(s) found"); | |
222 | /* pass the TFS Req IE(s) to driver for processing */ | |
223 | if (ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start, | |
224 | &tfsreq_ie_len, | |
225 | WNM_SLEEP_TFS_REQ_IE_SET)) | |
226 | wpa_printf(MSG_DEBUG, "Fail to set TFS Req IE"); | |
227 | } | |
228 | ||
229 | ieee802_11_send_wnmsleep_resp(hapd, addr, dialog_token, | |
230 | wnmsleep_ie->action_type, | |
231 | wnmsleep_ie->intval); | |
232 | ||
233 | if (wnmsleep_ie->action_type == 1) { | |
234 | /* clear the tfs after sending the resp frame */ | |
235 | ieee80211_11_set_tfs_ie(hapd, addr, tfsreq_ie_start, | |
236 | &tfsreq_ie_len, WNM_SLEEP_TFS_IE_DEL); | |
237 | } | |
238 | } | |
239 | ||
240 | ||
241 | void ieee802_11_rx_wnm_action_ap(struct hostapd_data *hapd, | |
242 | struct rx_action *action) | |
243 | { | |
244 | u8 *pos = (u8 *) action->data + 1; /* point to the action field */ | |
245 | u8 act = *pos; | |
246 | ||
247 | switch (act) { | |
248 | case WNM_SLEEP_MODE_REQ: | |
249 | ieee802_11_rx_wnmsleep_req(hapd, action->sa, action->data + 1, | |
250 | action->len); | |
251 | break; | |
252 | default: | |
253 | break; | |
254 | } | |
255 | } |