1 /* 2 * wpa_supplicant - Off-channel Action frame TX/RX 3 * Copyright (c) 2009-2010, Atheros Communications 4 * Copyright (c) 2011, Qualcomm Atheros 5 * 6 * This software may be distributed under the terms of the BSD license. 7 * See README for more details. 8 */ 9 10 #include "includes.h" 11 12 #include "common.h" 13 #include "utils/eloop.h" 14 #include "wpa_supplicant_i.h" 15 #include "driver_i.h" 16 #include "offchannel.h" 17 18 19 20 static struct wpa_supplicant * 21 wpas_get_tx_interface(struct wpa_supplicant *wpa_s, const u8 *src) 22 { 23 struct wpa_supplicant *iface; 24 25 if (os_memcmp(src, wpa_s->own_addr, ETH_ALEN) == 0) 26 return wpa_s; 27 28 /* 29 * Try to find a group interface that matches with the source address. 30 */ 31 iface = wpa_s->global->ifaces; 32 while (iface) { 33 if (os_memcmp(wpa_s->pending_action_src, 34 iface->own_addr, ETH_ALEN) == 0) 35 break; 36 iface = iface->next; 37 } 38 if (iface) { 39 wpa_printf(MSG_DEBUG, "P2P: Use group interface %s " 40 "instead of interface %s for Action TX", 41 iface->ifname, wpa_s->ifname); 42 return iface; 43 } 44 45 return wpa_s; 46 } 47 48 49 static void wpas_send_action_cb(void *eloop_ctx, void *timeout_ctx) 50 { 51 struct wpa_supplicant *wpa_s = eloop_ctx; 52 struct wpa_supplicant *iface; 53 int res; 54 int without_roc; 55 56 without_roc = wpa_s->pending_action_without_roc; 57 wpa_s->pending_action_without_roc = 0; 58 wpa_printf(MSG_DEBUG, "Off-channel: Send Action callback " 59 "(without_roc=%d pending_action_tx=%p)", 60 without_roc, wpa_s->pending_action_tx); 61 62 if (wpa_s->pending_action_tx == NULL) 63 return; 64 65 /* 66 * This call is likely going to be on the P2P device instance if the 67 * driver uses a separate interface for that purpose. However, some 68 * Action frames are actually sent within a P2P Group and when that is 69 * the case, we need to follow power saving (e.g., GO buffering the 70 * frame for a client in PS mode or a client following the advertised 71 * NoA from its GO). To make that easier for the driver, select the 72 * correct group interface here. 73 */ 74 iface = wpas_get_tx_interface(wpa_s, wpa_s->pending_action_src); 75 76 if (wpa_s->off_channel_freq != wpa_s->pending_action_freq && 77 wpa_s->pending_action_freq != 0 && 78 wpa_s->pending_action_freq != iface->assoc_freq) { 79 wpa_printf(MSG_DEBUG, "Off-channel: Pending Action frame TX " 80 "waiting for another freq=%u (off_channel_freq=%u " 81 "assoc_freq=%u)", 82 wpa_s->pending_action_freq, 83 wpa_s->off_channel_freq, 84 iface->assoc_freq); 85 if (without_roc && wpa_s->off_channel_freq == 0) { 86 /* 87 * We may get here if wpas_send_action() found us to be 88 * on the correct channel, but remain-on-channel cancel 89 * event was received before getting here. 90 */ 91 wpa_printf(MSG_DEBUG, "Off-channel: Schedule " 92 "remain-on-channel to send Action frame"); 93 if (wpa_drv_remain_on_channel( 94 wpa_s, wpa_s->pending_action_freq, 200) < 95 0) { 96 wpa_printf(MSG_DEBUG, "Off-channel: Failed to " 97 "request driver to remain on " 98 "channel (%u MHz) for Action Frame " 99 "TX", wpa_s->pending_action_freq); 100 } else { 101 wpa_s->off_channel_freq = 0; 102 wpa_s->roc_waiting_drv_freq = 103 wpa_s->pending_action_freq; 104 } 105 } 106 return; 107 } 108 109 wpa_printf(MSG_DEBUG, "Off-channel: Sending pending Action frame to " 110 MACSTR " using interface %s", 111 MAC2STR(wpa_s->pending_action_dst), iface->ifname); 112 res = wpa_drv_send_action(iface, wpa_s->pending_action_freq, 0, 113 wpa_s->pending_action_dst, 114 wpa_s->pending_action_src, 115 wpa_s->pending_action_bssid, 116 wpabuf_head(wpa_s->pending_action_tx), 117 wpabuf_len(wpa_s->pending_action_tx), 118 wpa_s->pending_action_no_cck); 119 if (res) { 120 wpa_printf(MSG_DEBUG, "Off-channel: Failed to send the " 121 "pending Action frame"); 122 /* 123 * Use fake TX status event to allow state machines to 124 * continue. 125 */ 126 offchannel_send_action_tx_status( 127 wpa_s, wpa_s->pending_action_dst, 128 wpabuf_head(wpa_s->pending_action_tx), 129 wpabuf_len(wpa_s->pending_action_tx), 130 OFFCHANNEL_SEND_ACTION_FAILED); 131 } 132 } 133 134 135 void offchannel_send_action_tx_status( 136 struct wpa_supplicant *wpa_s, const u8 *dst, const u8 *data, 137 size_t data_len, enum offchannel_send_action_result result) 138 { 139 if (wpa_s->pending_action_tx == NULL) { 140 wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - " 141 "no pending operation"); 142 return; 143 } 144 145 if (os_memcmp(dst, wpa_s->pending_action_dst, ETH_ALEN) != 0) { 146 wpa_printf(MSG_DEBUG, "Off-channel: Ignore Action TX status - " 147 "unknown destination address"); 148 return; 149 } 150 151 wpabuf_free(wpa_s->pending_action_tx); 152 wpa_s->pending_action_tx = NULL; 153 154 wpa_printf(MSG_DEBUG, "Off-channel: TX status result=%d cb=%p", 155 result, wpa_s->pending_action_tx_status_cb); 156 157 if (wpa_s->pending_action_tx_status_cb) { 158 wpa_s->pending_action_tx_status_cb( 159 wpa_s, wpa_s->pending_action_freq, 160 wpa_s->pending_action_dst, wpa_s->pending_action_src, 161 wpa_s->pending_action_bssid, 162 data, data_len, result); 163 } 164 } 165 166 167 int offchannel_send_action(struct wpa_supplicant *wpa_s, unsigned int freq, 168 const u8 *dst, const u8 *src, const u8 *bssid, 169 const u8 *buf, size_t len, unsigned int wait_time, 170 void (*tx_cb)(struct wpa_supplicant *wpa_s, 171 unsigned int freq, const u8 *dst, 172 const u8 *src, const u8 *bssid, 173 const u8 *data, size_t data_len, 174 enum offchannel_send_action_result 175 result), 176 int no_cck) 177 { 178 wpa_printf(MSG_DEBUG, "Off-channel: Send action frame: freq=%d dst=" 179 MACSTR " src=" MACSTR " bssid=" MACSTR " len=%d", 180 freq, MAC2STR(dst), MAC2STR(src), MAC2STR(bssid), 181 (int) len); 182 183 wpa_s->pending_action_tx_status_cb = tx_cb; 184 185 if (wpa_s->pending_action_tx) { 186 wpa_printf(MSG_DEBUG, "Off-channel: Dropped pending Action " 187 "frame TX to " MACSTR, 188 MAC2STR(wpa_s->pending_action_dst)); 189 wpabuf_free(wpa_s->pending_action_tx); 190 } 191 wpa_s->pending_action_tx = wpabuf_alloc(len); 192 if (wpa_s->pending_action_tx == NULL) { 193 wpa_printf(MSG_DEBUG, "Off-channel: Failed to allocate Action " 194 "frame TX buffer (len=%llu)", 195 (unsigned long long) len); 196 return -1; 197 } 198 wpabuf_put_data(wpa_s->pending_action_tx, buf, len); 199 os_memcpy(wpa_s->pending_action_src, src, ETH_ALEN); 200 os_memcpy(wpa_s->pending_action_dst, dst, ETH_ALEN); 201 os_memcpy(wpa_s->pending_action_bssid, bssid, ETH_ALEN); 202 wpa_s->pending_action_freq = freq; 203 wpa_s->pending_action_no_cck = no_cck; 204 205 if (freq != 0 && wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX) { 206 struct wpa_supplicant *iface; 207 208 iface = wpas_get_tx_interface(wpa_s, 209 wpa_s->pending_action_src); 210 wpa_s->action_tx_wait_time = wait_time; 211 212 return wpa_drv_send_action( 213 iface, wpa_s->pending_action_freq, 214 wait_time, wpa_s->pending_action_dst, 215 wpa_s->pending_action_src, wpa_s->pending_action_bssid, 216 wpabuf_head(wpa_s->pending_action_tx), 217 wpabuf_len(wpa_s->pending_action_tx), 218 wpa_s->pending_action_no_cck); 219 } 220 221 if (freq) { 222 struct wpa_supplicant *tx_iface; 223 tx_iface = wpas_get_tx_interface(wpa_s, src); 224 if (tx_iface->assoc_freq == freq) { 225 wpa_printf(MSG_DEBUG, "Off-channel: Already on " 226 "requested channel (TX interface operating " 227 "channel)"); 228 freq = 0; 229 } 230 } 231 232 if (wpa_s->off_channel_freq == freq || freq == 0) { 233 wpa_printf(MSG_DEBUG, "Off-channel: Already on requested " 234 "channel; send Action frame immediately"); 235 /* TODO: Would there ever be need to extend the current 236 * duration on the channel? */ 237 wpa_s->pending_action_without_roc = 1; 238 eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL); 239 eloop_register_timeout(0, 0, wpas_send_action_cb, wpa_s, NULL); 240 return 0; 241 } 242 wpa_s->pending_action_without_roc = 0; 243 244 if (wpa_s->roc_waiting_drv_freq == freq) { 245 wpa_printf(MSG_DEBUG, "Off-channel: Already waiting for " 246 "driver to get to frequency %u MHz; continue " 247 "waiting to send the Action frame", freq); 248 return 0; 249 } 250 251 wpa_printf(MSG_DEBUG, "Off-channel: Schedule Action frame to be " 252 "transmitted once the driver gets to the requested " 253 "channel"); 254 if (wait_time > wpa_s->max_remain_on_chan) 255 wait_time = wpa_s->max_remain_on_chan; 256 if (wpa_drv_remain_on_channel(wpa_s, freq, wait_time) < 0) { 257 wpa_printf(MSG_DEBUG, "Off-channel: Failed to request driver " 258 "to remain on channel (%u MHz) for Action " 259 "Frame TX", freq); 260 return -1; 261 } 262 wpa_s->off_channel_freq = 0; 263 wpa_s->roc_waiting_drv_freq = freq; 264 265 return 0; 266 } 267 268 269 void offchannel_send_action_done(struct wpa_supplicant *wpa_s) 270 { 271 wpa_printf(MSG_DEBUG, "Off-channel: Action frame sequence done " 272 "notification"); 273 wpabuf_free(wpa_s->pending_action_tx); 274 wpa_s->pending_action_tx = NULL; 275 if (wpa_s->drv_flags & WPA_DRIVER_FLAGS_OFFCHANNEL_TX && 276 wpa_s->action_tx_wait_time) 277 wpa_drv_send_action_cancel_wait(wpa_s); 278 279 if (wpa_s->off_channel_freq || wpa_s->roc_waiting_drv_freq) { 280 wpa_drv_cancel_remain_on_channel(wpa_s); 281 wpa_s->off_channel_freq = 0; 282 wpa_s->roc_waiting_drv_freq = 0; 283 } 284 } 285 286 287 void offchannel_remain_on_channel_cb(struct wpa_supplicant *wpa_s, 288 unsigned int freq, unsigned int duration) 289 { 290 wpa_s->roc_waiting_drv_freq = 0; 291 wpa_s->off_channel_freq = freq; 292 wpas_send_action_cb(wpa_s, NULL); 293 } 294 295 296 void offchannel_cancel_remain_on_channel_cb(struct wpa_supplicant *wpa_s, 297 unsigned int freq) 298 { 299 wpa_s->off_channel_freq = 0; 300 } 301 302 303 void offchannel_deinit(struct wpa_supplicant *wpa_s) 304 { 305 wpabuf_free(wpa_s->pending_action_tx); 306 wpa_s->pending_action_tx = NULL; 307 eloop_cancel_timeout(wpas_send_action_cb, wpa_s, NULL); 308 } 309
