| 1 | /* |
| 2 | * Copyright 2002-2005, Instant802 Networks, Inc. |
| 3 | * Copyright 2005-2006, Devicescape Software, Inc. |
| 4 | * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz> |
| 5 | * Copyright 2007 Johannes Berg <johannes@sipsolutions.net> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/jiffies.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/etherdevice.h> |
| 17 | #include <linux/rcupdate.h> |
| 18 | #include <net/mac80211.h> |
| 19 | #include <net/ieee80211_radiotap.h> |
| 20 | |
| 21 | #include "ieee80211_i.h" |
| 22 | #include "driver-ops.h" |
| 23 | #include "led.h" |
| 24 | #include "mesh.h" |
| 25 | #include "wep.h" |
| 26 | #include "wpa.h" |
| 27 | #include "tkip.h" |
| 28 | #include "wme.h" |
| 29 | |
| 30 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
| 31 | struct tid_ampdu_rx *tid_agg_rx, |
| 32 | struct sk_buff *skb, |
| 33 | u16 mpdu_seq_num, |
| 34 | int bar_req); |
| 35 | /* |
| 36 | * monitor mode reception |
| 37 | * |
| 38 | * This function cleans up the SKB, i.e. it removes all the stuff |
| 39 | * only useful for monitoring. |
| 40 | */ |
| 41 | static struct sk_buff *remove_monitor_info(struct ieee80211_local *local, |
| 42 | struct sk_buff *skb, |
| 43 | int rtap_len) |
| 44 | { |
| 45 | skb_pull(skb, rtap_len); |
| 46 | |
| 47 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) { |
| 48 | if (likely(skb->len > FCS_LEN)) |
| 49 | skb_trim(skb, skb->len - FCS_LEN); |
| 50 | else { |
| 51 | /* driver bug */ |
| 52 | WARN_ON(1); |
| 53 | dev_kfree_skb(skb); |
| 54 | skb = NULL; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | return skb; |
| 59 | } |
| 60 | |
| 61 | static inline int should_drop_frame(struct sk_buff *skb, |
| 62 | int present_fcs_len, |
| 63 | int radiotap_len) |
| 64 | { |
| 65 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 66 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 67 | |
| 68 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| 69 | return 1; |
| 70 | if (unlikely(skb->len < 16 + present_fcs_len + radiotap_len)) |
| 71 | return 1; |
| 72 | if (ieee80211_is_ctl(hdr->frame_control) && |
| 73 | !ieee80211_is_pspoll(hdr->frame_control) && |
| 74 | !ieee80211_is_back_req(hdr->frame_control)) |
| 75 | return 1; |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | static int |
| 80 | ieee80211_rx_radiotap_len(struct ieee80211_local *local, |
| 81 | struct ieee80211_rx_status *status) |
| 82 | { |
| 83 | int len; |
| 84 | |
| 85 | /* always present fields */ |
| 86 | len = sizeof(struct ieee80211_radiotap_header) + 9; |
| 87 | |
| 88 | if (status->flag & RX_FLAG_TSFT) |
| 89 | len += 8; |
| 90 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) |
| 91 | len += 1; |
| 92 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) |
| 93 | len += 1; |
| 94 | |
| 95 | if (len & 1) /* padding for RX_FLAGS if necessary */ |
| 96 | len++; |
| 97 | |
| 98 | /* make sure radiotap starts at a naturally aligned address */ |
| 99 | if (len % 8) |
| 100 | len = roundup(len, 8); |
| 101 | |
| 102 | return len; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * ieee80211_add_rx_radiotap_header - add radiotap header |
| 107 | * |
| 108 | * add a radiotap header containing all the fields which the hardware provided. |
| 109 | */ |
| 110 | static void |
| 111 | ieee80211_add_rx_radiotap_header(struct ieee80211_local *local, |
| 112 | struct sk_buff *skb, |
| 113 | struct ieee80211_rate *rate, |
| 114 | int rtap_len) |
| 115 | { |
| 116 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 117 | struct ieee80211_radiotap_header *rthdr; |
| 118 | unsigned char *pos; |
| 119 | |
| 120 | rthdr = (struct ieee80211_radiotap_header *)skb_push(skb, rtap_len); |
| 121 | memset(rthdr, 0, rtap_len); |
| 122 | |
| 123 | /* radiotap header, set always present flags */ |
| 124 | rthdr->it_present = |
| 125 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
| 126 | (1 << IEEE80211_RADIOTAP_CHANNEL) | |
| 127 | (1 << IEEE80211_RADIOTAP_ANTENNA) | |
| 128 | (1 << IEEE80211_RADIOTAP_RX_FLAGS)); |
| 129 | rthdr->it_len = cpu_to_le16(rtap_len); |
| 130 | |
| 131 | pos = (unsigned char *)(rthdr+1); |
| 132 | |
| 133 | /* the order of the following fields is important */ |
| 134 | |
| 135 | /* IEEE80211_RADIOTAP_TSFT */ |
| 136 | if (status->flag & RX_FLAG_TSFT) { |
| 137 | *(__le64 *)pos = cpu_to_le64(status->mactime); |
| 138 | rthdr->it_present |= |
| 139 | cpu_to_le32(1 << IEEE80211_RADIOTAP_TSFT); |
| 140 | pos += 8; |
| 141 | } |
| 142 | |
| 143 | /* IEEE80211_RADIOTAP_FLAGS */ |
| 144 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| 145 | *pos |= IEEE80211_RADIOTAP_F_FCS; |
| 146 | if (status->flag & (RX_FLAG_FAILED_FCS_CRC | RX_FLAG_FAILED_PLCP_CRC)) |
| 147 | *pos |= IEEE80211_RADIOTAP_F_BADFCS; |
| 148 | if (status->flag & RX_FLAG_SHORTPRE) |
| 149 | *pos |= IEEE80211_RADIOTAP_F_SHORTPRE; |
| 150 | pos++; |
| 151 | |
| 152 | /* IEEE80211_RADIOTAP_RATE */ |
| 153 | if (status->flag & RX_FLAG_HT) { |
| 154 | /* |
| 155 | * TODO: add following information into radiotap header once |
| 156 | * suitable fields are defined for it: |
| 157 | * - MCS index (status->rate_idx) |
| 158 | * - HT40 (status->flag & RX_FLAG_40MHZ) |
| 159 | * - short-GI (status->flag & RX_FLAG_SHORT_GI) |
| 160 | */ |
| 161 | *pos = 0; |
| 162 | } else { |
| 163 | rthdr->it_present |= cpu_to_le32(1 << IEEE80211_RADIOTAP_RATE); |
| 164 | *pos = rate->bitrate / 5; |
| 165 | } |
| 166 | pos++; |
| 167 | |
| 168 | /* IEEE80211_RADIOTAP_CHANNEL */ |
| 169 | *(__le16 *)pos = cpu_to_le16(status->freq); |
| 170 | pos += 2; |
| 171 | if (status->band == IEEE80211_BAND_5GHZ) |
| 172 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| 173 | IEEE80211_CHAN_5GHZ); |
| 174 | else if (rate->flags & IEEE80211_RATE_ERP_G) |
| 175 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| 176 | IEEE80211_CHAN_2GHZ); |
| 177 | else |
| 178 | *(__le16 *)pos = cpu_to_le16(IEEE80211_CHAN_CCK | |
| 179 | IEEE80211_CHAN_2GHZ); |
| 180 | pos += 2; |
| 181 | |
| 182 | /* IEEE80211_RADIOTAP_DBM_ANTSIGNAL */ |
| 183 | if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM) { |
| 184 | *pos = status->signal; |
| 185 | rthdr->it_present |= |
| 186 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL); |
| 187 | pos++; |
| 188 | } |
| 189 | |
| 190 | /* IEEE80211_RADIOTAP_DBM_ANTNOISE */ |
| 191 | if (local->hw.flags & IEEE80211_HW_NOISE_DBM) { |
| 192 | *pos = status->noise; |
| 193 | rthdr->it_present |= |
| 194 | cpu_to_le32(1 << IEEE80211_RADIOTAP_DBM_ANTNOISE); |
| 195 | pos++; |
| 196 | } |
| 197 | |
| 198 | /* IEEE80211_RADIOTAP_LOCK_QUALITY is missing */ |
| 199 | |
| 200 | /* IEEE80211_RADIOTAP_ANTENNA */ |
| 201 | *pos = status->antenna; |
| 202 | pos++; |
| 203 | |
| 204 | /* IEEE80211_RADIOTAP_DB_ANTNOISE is not used */ |
| 205 | |
| 206 | /* IEEE80211_RADIOTAP_RX_FLAGS */ |
| 207 | /* ensure 2 byte alignment for the 2 byte field as required */ |
| 208 | if ((pos - (unsigned char *)rthdr) & 1) |
| 209 | pos++; |
| 210 | if (status->flag & RX_FLAG_FAILED_PLCP_CRC) |
| 211 | *(__le16 *)pos |= cpu_to_le16(IEEE80211_RADIOTAP_F_RX_BADPLCP); |
| 212 | pos += 2; |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * This function copies a received frame to all monitor interfaces and |
| 217 | * returns a cleaned-up SKB that no longer includes the FCS nor the |
| 218 | * radiotap header the driver might have added. |
| 219 | */ |
| 220 | static struct sk_buff * |
| 221 | ieee80211_rx_monitor(struct ieee80211_local *local, struct sk_buff *origskb, |
| 222 | struct ieee80211_rate *rate) |
| 223 | { |
| 224 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(origskb); |
| 225 | struct ieee80211_sub_if_data *sdata; |
| 226 | int needed_headroom = 0; |
| 227 | struct sk_buff *skb, *skb2; |
| 228 | struct net_device *prev_dev = NULL; |
| 229 | int present_fcs_len = 0; |
| 230 | int rtap_len = 0; |
| 231 | |
| 232 | /* |
| 233 | * First, we may need to make a copy of the skb because |
| 234 | * (1) we need to modify it for radiotap (if not present), and |
| 235 | * (2) the other RX handlers will modify the skb we got. |
| 236 | * |
| 237 | * We don't need to, of course, if we aren't going to return |
| 238 | * the SKB because it has a bad FCS/PLCP checksum. |
| 239 | */ |
| 240 | if (status->flag & RX_FLAG_RADIOTAP) |
| 241 | rtap_len = ieee80211_get_radiotap_len(origskb->data); |
| 242 | else |
| 243 | /* room for the radiotap header based on driver features */ |
| 244 | needed_headroom = ieee80211_rx_radiotap_len(local, status); |
| 245 | |
| 246 | if (local->hw.flags & IEEE80211_HW_RX_INCLUDES_FCS) |
| 247 | present_fcs_len = FCS_LEN; |
| 248 | |
| 249 | if (!local->monitors) { |
| 250 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
| 251 | dev_kfree_skb(origskb); |
| 252 | return NULL; |
| 253 | } |
| 254 | |
| 255 | return remove_monitor_info(local, origskb, rtap_len); |
| 256 | } |
| 257 | |
| 258 | if (should_drop_frame(origskb, present_fcs_len, rtap_len)) { |
| 259 | /* only need to expand headroom if necessary */ |
| 260 | skb = origskb; |
| 261 | origskb = NULL; |
| 262 | |
| 263 | /* |
| 264 | * This shouldn't trigger often because most devices have an |
| 265 | * RX header they pull before we get here, and that should |
| 266 | * be big enough for our radiotap information. We should |
| 267 | * probably export the length to drivers so that we can have |
| 268 | * them allocate enough headroom to start with. |
| 269 | */ |
| 270 | if (skb_headroom(skb) < needed_headroom && |
| 271 | pskb_expand_head(skb, needed_headroom, 0, GFP_ATOMIC)) { |
| 272 | dev_kfree_skb(skb); |
| 273 | return NULL; |
| 274 | } |
| 275 | } else { |
| 276 | /* |
| 277 | * Need to make a copy and possibly remove radiotap header |
| 278 | * and FCS from the original. |
| 279 | */ |
| 280 | skb = skb_copy_expand(origskb, needed_headroom, 0, GFP_ATOMIC); |
| 281 | |
| 282 | origskb = remove_monitor_info(local, origskb, rtap_len); |
| 283 | |
| 284 | if (!skb) |
| 285 | return origskb; |
| 286 | } |
| 287 | |
| 288 | /* if necessary, prepend radiotap information */ |
| 289 | if (!(status->flag & RX_FLAG_RADIOTAP)) |
| 290 | ieee80211_add_rx_radiotap_header(local, skb, rate, |
| 291 | needed_headroom); |
| 292 | |
| 293 | skb_reset_mac_header(skb); |
| 294 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 295 | skb->pkt_type = PACKET_OTHERHOST; |
| 296 | skb->protocol = htons(ETH_P_802_2); |
| 297 | |
| 298 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| 299 | if (!netif_running(sdata->dev)) |
| 300 | continue; |
| 301 | |
| 302 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR) |
| 303 | continue; |
| 304 | |
| 305 | if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) |
| 306 | continue; |
| 307 | |
| 308 | if (prev_dev) { |
| 309 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 310 | if (skb2) { |
| 311 | skb2->dev = prev_dev; |
| 312 | netif_rx(skb2); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | prev_dev = sdata->dev; |
| 317 | sdata->dev->stats.rx_packets++; |
| 318 | sdata->dev->stats.rx_bytes += skb->len; |
| 319 | } |
| 320 | |
| 321 | if (prev_dev) { |
| 322 | skb->dev = prev_dev; |
| 323 | netif_rx(skb); |
| 324 | } else |
| 325 | dev_kfree_skb(skb); |
| 326 | |
| 327 | return origskb; |
| 328 | } |
| 329 | |
| 330 | |
| 331 | static void ieee80211_parse_qos(struct ieee80211_rx_data *rx) |
| 332 | { |
| 333 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 334 | int tid; |
| 335 | |
| 336 | /* does the frame have a qos control field? */ |
| 337 | if (ieee80211_is_data_qos(hdr->frame_control)) { |
| 338 | u8 *qc = ieee80211_get_qos_ctl(hdr); |
| 339 | /* frame has qos control */ |
| 340 | tid = *qc & IEEE80211_QOS_CTL_TID_MASK; |
| 341 | if (*qc & IEEE80211_QOS_CONTROL_A_MSDU_PRESENT) |
| 342 | rx->flags |= IEEE80211_RX_AMSDU; |
| 343 | else |
| 344 | rx->flags &= ~IEEE80211_RX_AMSDU; |
| 345 | } else { |
| 346 | /* |
| 347 | * IEEE 802.11-2007, 7.1.3.4.1 ("Sequence Number field"): |
| 348 | * |
| 349 | * Sequence numbers for management frames, QoS data |
| 350 | * frames with a broadcast/multicast address in the |
| 351 | * Address 1 field, and all non-QoS data frames sent |
| 352 | * by QoS STAs are assigned using an additional single |
| 353 | * modulo-4096 counter, [...] |
| 354 | * |
| 355 | * We also use that counter for non-QoS STAs. |
| 356 | */ |
| 357 | tid = NUM_RX_DATA_QUEUES - 1; |
| 358 | } |
| 359 | |
| 360 | rx->queue = tid; |
| 361 | /* Set skb->priority to 1d tag if highest order bit of TID is not set. |
| 362 | * For now, set skb->priority to 0 for other cases. */ |
| 363 | rx->skb->priority = (tid > 7) ? 0 : tid; |
| 364 | } |
| 365 | |
| 366 | /** |
| 367 | * DOC: Packet alignment |
| 368 | * |
| 369 | * Drivers always need to pass packets that are aligned to two-byte boundaries |
| 370 | * to the stack. |
| 371 | * |
| 372 | * Additionally, should, if possible, align the payload data in a way that |
| 373 | * guarantees that the contained IP header is aligned to a four-byte |
| 374 | * boundary. In the case of regular frames, this simply means aligning the |
| 375 | * payload to a four-byte boundary (because either the IP header is directly |
| 376 | * contained, or IV/RFC1042 headers that have a length divisible by four are |
| 377 | * in front of it). |
| 378 | * |
| 379 | * With A-MSDU frames, however, the payload data address must yield two modulo |
| 380 | * four because there are 14-byte 802.3 headers within the A-MSDU frames that |
| 381 | * push the IP header further back to a multiple of four again. Thankfully, the |
| 382 | * specs were sane enough this time around to require padding each A-MSDU |
| 383 | * subframe to a length that is a multiple of four. |
| 384 | * |
| 385 | * Padding like Atheros hardware adds which is inbetween the 802.11 header and |
| 386 | * the payload is not supported, the driver is required to move the 802.11 |
| 387 | * header to be directly in front of the payload in that case. |
| 388 | */ |
| 389 | static void ieee80211_verify_alignment(struct ieee80211_rx_data *rx) |
| 390 | { |
| 391 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 392 | int hdrlen; |
| 393 | |
| 394 | #ifndef CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT |
| 395 | return; |
| 396 | #endif |
| 397 | |
| 398 | if (WARN_ONCE((unsigned long)rx->skb->data & 1, |
| 399 | "unaligned packet at 0x%p\n", rx->skb->data)) |
| 400 | return; |
| 401 | |
| 402 | if (!ieee80211_is_data_present(hdr->frame_control)) |
| 403 | return; |
| 404 | |
| 405 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 406 | if (rx->flags & IEEE80211_RX_AMSDU) |
| 407 | hdrlen += ETH_HLEN; |
| 408 | WARN_ONCE(((unsigned long)(rx->skb->data + hdrlen)) & 3, |
| 409 | "unaligned IP payload at 0x%p\n", rx->skb->data + hdrlen); |
| 410 | } |
| 411 | |
| 412 | |
| 413 | /* rx handlers */ |
| 414 | |
| 415 | static ieee80211_rx_result debug_noinline |
| 416 | ieee80211_rx_h_passive_scan(struct ieee80211_rx_data *rx) |
| 417 | { |
| 418 | struct ieee80211_local *local = rx->local; |
| 419 | struct sk_buff *skb = rx->skb; |
| 420 | |
| 421 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning))) |
| 422 | return ieee80211_scan_rx(rx->sdata, skb); |
| 423 | |
| 424 | if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning) && |
| 425 | (rx->flags & IEEE80211_RX_IN_SCAN))) { |
| 426 | /* drop all the other packets during a software scan anyway */ |
| 427 | if (ieee80211_scan_rx(rx->sdata, skb) != RX_QUEUED) |
| 428 | dev_kfree_skb(skb); |
| 429 | return RX_QUEUED; |
| 430 | } |
| 431 | |
| 432 | if (unlikely(rx->flags & IEEE80211_RX_IN_SCAN)) { |
| 433 | /* scanning finished during invoking of handlers */ |
| 434 | I802_DEBUG_INC(local->rx_handlers_drop_passive_scan); |
| 435 | return RX_DROP_UNUSABLE; |
| 436 | } |
| 437 | |
| 438 | return RX_CONTINUE; |
| 439 | } |
| 440 | |
| 441 | |
| 442 | static int ieee80211_is_unicast_robust_mgmt_frame(struct sk_buff *skb) |
| 443 | { |
| 444 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 445 | |
| 446 | if (skb->len < 24 || is_multicast_ether_addr(hdr->addr1)) |
| 447 | return 0; |
| 448 | |
| 449 | return ieee80211_is_robust_mgmt_frame(hdr); |
| 450 | } |
| 451 | |
| 452 | |
| 453 | static int ieee80211_is_multicast_robust_mgmt_frame(struct sk_buff *skb) |
| 454 | { |
| 455 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 456 | |
| 457 | if (skb->len < 24 || !is_multicast_ether_addr(hdr->addr1)) |
| 458 | return 0; |
| 459 | |
| 460 | return ieee80211_is_robust_mgmt_frame(hdr); |
| 461 | } |
| 462 | |
| 463 | |
| 464 | /* Get the BIP key index from MMIE; return -1 if this is not a BIP frame */ |
| 465 | static int ieee80211_get_mmie_keyidx(struct sk_buff *skb) |
| 466 | { |
| 467 | struct ieee80211_mgmt *hdr = (struct ieee80211_mgmt *) skb->data; |
| 468 | struct ieee80211_mmie *mmie; |
| 469 | |
| 470 | if (skb->len < 24 + sizeof(*mmie) || |
| 471 | !is_multicast_ether_addr(hdr->da)) |
| 472 | return -1; |
| 473 | |
| 474 | if (!ieee80211_is_robust_mgmt_frame((struct ieee80211_hdr *) hdr)) |
| 475 | return -1; /* not a robust management frame */ |
| 476 | |
| 477 | mmie = (struct ieee80211_mmie *) |
| 478 | (skb->data + skb->len - sizeof(*mmie)); |
| 479 | if (mmie->element_id != WLAN_EID_MMIE || |
| 480 | mmie->length != sizeof(*mmie) - 2) |
| 481 | return -1; |
| 482 | |
| 483 | return le16_to_cpu(mmie->key_id); |
| 484 | } |
| 485 | |
| 486 | |
| 487 | static ieee80211_rx_result |
| 488 | ieee80211_rx_mesh_check(struct ieee80211_rx_data *rx) |
| 489 | { |
| 490 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 491 | unsigned int hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 492 | char *dev_addr = rx->dev->dev_addr; |
| 493 | |
| 494 | if (ieee80211_is_data(hdr->frame_control)) { |
| 495 | if (is_multicast_ether_addr(hdr->addr1)) { |
| 496 | if (ieee80211_has_tods(hdr->frame_control) || |
| 497 | !ieee80211_has_fromds(hdr->frame_control)) |
| 498 | return RX_DROP_MONITOR; |
| 499 | if (memcmp(hdr->addr3, dev_addr, ETH_ALEN) == 0) |
| 500 | return RX_DROP_MONITOR; |
| 501 | } else { |
| 502 | if (!ieee80211_has_a4(hdr->frame_control)) |
| 503 | return RX_DROP_MONITOR; |
| 504 | if (memcmp(hdr->addr4, dev_addr, ETH_ALEN) == 0) |
| 505 | return RX_DROP_MONITOR; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /* If there is not an established peer link and this is not a peer link |
| 510 | * establisment frame, beacon or probe, drop the frame. |
| 511 | */ |
| 512 | |
| 513 | if (!rx->sta || sta_plink_state(rx->sta) != PLINK_ESTAB) { |
| 514 | struct ieee80211_mgmt *mgmt; |
| 515 | |
| 516 | if (!ieee80211_is_mgmt(hdr->frame_control)) |
| 517 | return RX_DROP_MONITOR; |
| 518 | |
| 519 | if (ieee80211_is_action(hdr->frame_control)) { |
| 520 | mgmt = (struct ieee80211_mgmt *)hdr; |
| 521 | if (mgmt->u.action.category != PLINK_CATEGORY) |
| 522 | return RX_DROP_MONITOR; |
| 523 | return RX_CONTINUE; |
| 524 | } |
| 525 | |
| 526 | if (ieee80211_is_probe_req(hdr->frame_control) || |
| 527 | ieee80211_is_probe_resp(hdr->frame_control) || |
| 528 | ieee80211_is_beacon(hdr->frame_control)) |
| 529 | return RX_CONTINUE; |
| 530 | |
| 531 | return RX_DROP_MONITOR; |
| 532 | |
| 533 | } |
| 534 | |
| 535 | #define msh_h_get(h, l) ((struct ieee80211s_hdr *) ((u8 *)h + l)) |
| 536 | |
| 537 | if (ieee80211_is_data(hdr->frame_control) && |
| 538 | is_multicast_ether_addr(hdr->addr1) && |
| 539 | mesh_rmc_check(hdr->addr3, msh_h_get(hdr, hdrlen), rx->sdata)) |
| 540 | return RX_DROP_MONITOR; |
| 541 | #undef msh_h_get |
| 542 | |
| 543 | return RX_CONTINUE; |
| 544 | } |
| 545 | |
| 546 | |
| 547 | static ieee80211_rx_result debug_noinline |
| 548 | ieee80211_rx_h_check(struct ieee80211_rx_data *rx) |
| 549 | { |
| 550 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 551 | |
| 552 | /* Drop duplicate 802.11 retransmissions (IEEE 802.11 Chap. 9.2.9) */ |
| 553 | if (rx->sta && !is_multicast_ether_addr(hdr->addr1)) { |
| 554 | if (unlikely(ieee80211_has_retry(hdr->frame_control) && |
| 555 | rx->sta->last_seq_ctrl[rx->queue] == |
| 556 | hdr->seq_ctrl)) { |
| 557 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
| 558 | rx->local->dot11FrameDuplicateCount++; |
| 559 | rx->sta->num_duplicates++; |
| 560 | } |
| 561 | return RX_DROP_MONITOR; |
| 562 | } else |
| 563 | rx->sta->last_seq_ctrl[rx->queue] = hdr->seq_ctrl; |
| 564 | } |
| 565 | |
| 566 | if (unlikely(rx->skb->len < 16)) { |
| 567 | I802_DEBUG_INC(rx->local->rx_handlers_drop_short); |
| 568 | return RX_DROP_MONITOR; |
| 569 | } |
| 570 | |
| 571 | /* Drop disallowed frame classes based on STA auth/assoc state; |
| 572 | * IEEE 802.11, Chap 5.5. |
| 573 | * |
| 574 | * mac80211 filters only based on association state, i.e. it drops |
| 575 | * Class 3 frames from not associated stations. hostapd sends |
| 576 | * deauth/disassoc frames when needed. In addition, hostapd is |
| 577 | * responsible for filtering on both auth and assoc states. |
| 578 | */ |
| 579 | |
| 580 | if (ieee80211_vif_is_mesh(&rx->sdata->vif)) |
| 581 | return ieee80211_rx_mesh_check(rx); |
| 582 | |
| 583 | if (unlikely((ieee80211_is_data(hdr->frame_control) || |
| 584 | ieee80211_is_pspoll(hdr->frame_control)) && |
| 585 | rx->sdata->vif.type != NL80211_IFTYPE_ADHOC && |
| 586 | (!rx->sta || !test_sta_flags(rx->sta, WLAN_STA_ASSOC)))) { |
| 587 | if ((!ieee80211_has_fromds(hdr->frame_control) && |
| 588 | !ieee80211_has_tods(hdr->frame_control) && |
| 589 | ieee80211_is_data(hdr->frame_control)) || |
| 590 | !(rx->flags & IEEE80211_RX_RA_MATCH)) { |
| 591 | /* Drop IBSS frames and frames for other hosts |
| 592 | * silently. */ |
| 593 | return RX_DROP_MONITOR; |
| 594 | } |
| 595 | |
| 596 | return RX_DROP_MONITOR; |
| 597 | } |
| 598 | |
| 599 | return RX_CONTINUE; |
| 600 | } |
| 601 | |
| 602 | |
| 603 | static ieee80211_rx_result debug_noinline |
| 604 | ieee80211_rx_h_decrypt(struct ieee80211_rx_data *rx) |
| 605 | { |
| 606 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 607 | int keyidx; |
| 608 | int hdrlen; |
| 609 | ieee80211_rx_result result = RX_DROP_UNUSABLE; |
| 610 | struct ieee80211_key *stakey = NULL; |
| 611 | int mmie_keyidx = -1; |
| 612 | |
| 613 | /* |
| 614 | * Key selection 101 |
| 615 | * |
| 616 | * There are four types of keys: |
| 617 | * - GTK (group keys) |
| 618 | * - IGTK (group keys for management frames) |
| 619 | * - PTK (pairwise keys) |
| 620 | * - STK (station-to-station pairwise keys) |
| 621 | * |
| 622 | * When selecting a key, we have to distinguish between multicast |
| 623 | * (including broadcast) and unicast frames, the latter can only |
| 624 | * use PTKs and STKs while the former always use GTKs and IGTKs. |
| 625 | * Unless, of course, actual WEP keys ("pre-RSNA") are used, then |
| 626 | * unicast frames can also use key indices like GTKs. Hence, if we |
| 627 | * don't have a PTK/STK we check the key index for a WEP key. |
| 628 | * |
| 629 | * Note that in a regular BSS, multicast frames are sent by the |
| 630 | * AP only, associated stations unicast the frame to the AP first |
| 631 | * which then multicasts it on their behalf. |
| 632 | * |
| 633 | * There is also a slight problem in IBSS mode: GTKs are negotiated |
| 634 | * with each station, that is something we don't currently handle. |
| 635 | * The spec seems to expect that one negotiates the same key with |
| 636 | * every station but there's no such requirement; VLANs could be |
| 637 | * possible. |
| 638 | */ |
| 639 | |
| 640 | /* |
| 641 | * No point in finding a key and decrypting if the frame is neither |
| 642 | * addressed to us nor a multicast frame. |
| 643 | */ |
| 644 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| 645 | return RX_CONTINUE; |
| 646 | |
| 647 | if (rx->sta) |
| 648 | stakey = rcu_dereference(rx->sta->key); |
| 649 | |
| 650 | if (!ieee80211_has_protected(hdr->frame_control)) |
| 651 | mmie_keyidx = ieee80211_get_mmie_keyidx(rx->skb); |
| 652 | |
| 653 | if (!is_multicast_ether_addr(hdr->addr1) && stakey) { |
| 654 | rx->key = stakey; |
| 655 | /* Skip decryption if the frame is not protected. */ |
| 656 | if (!ieee80211_has_protected(hdr->frame_control)) |
| 657 | return RX_CONTINUE; |
| 658 | } else if (mmie_keyidx >= 0) { |
| 659 | /* Broadcast/multicast robust management frame / BIP */ |
| 660 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
| 661 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) |
| 662 | return RX_CONTINUE; |
| 663 | |
| 664 | if (mmie_keyidx < NUM_DEFAULT_KEYS || |
| 665 | mmie_keyidx >= NUM_DEFAULT_KEYS + NUM_DEFAULT_MGMT_KEYS) |
| 666 | return RX_DROP_MONITOR; /* unexpected BIP keyidx */ |
| 667 | rx->key = rcu_dereference(rx->sdata->keys[mmie_keyidx]); |
| 668 | } else if (!ieee80211_has_protected(hdr->frame_control)) { |
| 669 | /* |
| 670 | * The frame was not protected, so skip decryption. However, we |
| 671 | * need to set rx->key if there is a key that could have been |
| 672 | * used so that the frame may be dropped if encryption would |
| 673 | * have been expected. |
| 674 | */ |
| 675 | struct ieee80211_key *key = NULL; |
| 676 | if (ieee80211_is_mgmt(hdr->frame_control) && |
| 677 | is_multicast_ether_addr(hdr->addr1) && |
| 678 | (key = rcu_dereference(rx->sdata->default_mgmt_key))) |
| 679 | rx->key = key; |
| 680 | else if ((key = rcu_dereference(rx->sdata->default_key))) |
| 681 | rx->key = key; |
| 682 | return RX_CONTINUE; |
| 683 | } else { |
| 684 | /* |
| 685 | * The device doesn't give us the IV so we won't be |
| 686 | * able to look up the key. That's ok though, we |
| 687 | * don't need to decrypt the frame, we just won't |
| 688 | * be able to keep statistics accurate. |
| 689 | * Except for key threshold notifications, should |
| 690 | * we somehow allow the driver to tell us which key |
| 691 | * the hardware used if this flag is set? |
| 692 | */ |
| 693 | if ((rx->status->flag & RX_FLAG_DECRYPTED) && |
| 694 | (rx->status->flag & RX_FLAG_IV_STRIPPED)) |
| 695 | return RX_CONTINUE; |
| 696 | |
| 697 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 698 | |
| 699 | if (rx->skb->len < 8 + hdrlen) |
| 700 | return RX_DROP_UNUSABLE; /* TODO: count this? */ |
| 701 | |
| 702 | /* |
| 703 | * no need to call ieee80211_wep_get_keyidx, |
| 704 | * it verifies a bunch of things we've done already |
| 705 | */ |
| 706 | keyidx = rx->skb->data[hdrlen + 3] >> 6; |
| 707 | |
| 708 | rx->key = rcu_dereference(rx->sdata->keys[keyidx]); |
| 709 | |
| 710 | /* |
| 711 | * RSNA-protected unicast frames should always be sent with |
| 712 | * pairwise or station-to-station keys, but for WEP we allow |
| 713 | * using a key index as well. |
| 714 | */ |
| 715 | if (rx->key && rx->key->conf.alg != ALG_WEP && |
| 716 | !is_multicast_ether_addr(hdr->addr1)) |
| 717 | rx->key = NULL; |
| 718 | } |
| 719 | |
| 720 | if (rx->key) { |
| 721 | rx->key->tx_rx_count++; |
| 722 | /* TODO: add threshold stuff again */ |
| 723 | } else { |
| 724 | return RX_DROP_MONITOR; |
| 725 | } |
| 726 | |
| 727 | /* Check for weak IVs if possible */ |
| 728 | if (rx->sta && rx->key->conf.alg == ALG_WEP && |
| 729 | ieee80211_is_data(hdr->frame_control) && |
| 730 | (!(rx->status->flag & RX_FLAG_IV_STRIPPED) || |
| 731 | !(rx->status->flag & RX_FLAG_DECRYPTED)) && |
| 732 | ieee80211_wep_is_weak_iv(rx->skb, rx->key)) |
| 733 | rx->sta->wep_weak_iv_count++; |
| 734 | |
| 735 | switch (rx->key->conf.alg) { |
| 736 | case ALG_WEP: |
| 737 | result = ieee80211_crypto_wep_decrypt(rx); |
| 738 | break; |
| 739 | case ALG_TKIP: |
| 740 | result = ieee80211_crypto_tkip_decrypt(rx); |
| 741 | break; |
| 742 | case ALG_CCMP: |
| 743 | result = ieee80211_crypto_ccmp_decrypt(rx); |
| 744 | break; |
| 745 | case ALG_AES_CMAC: |
| 746 | result = ieee80211_crypto_aes_cmac_decrypt(rx); |
| 747 | break; |
| 748 | } |
| 749 | |
| 750 | /* either the frame has been decrypted or will be dropped */ |
| 751 | rx->status->flag |= RX_FLAG_DECRYPTED; |
| 752 | |
| 753 | return result; |
| 754 | } |
| 755 | |
| 756 | static ieee80211_rx_result debug_noinline |
| 757 | ieee80211_rx_h_check_more_data(struct ieee80211_rx_data *rx) |
| 758 | { |
| 759 | struct ieee80211_local *local; |
| 760 | struct ieee80211_hdr *hdr; |
| 761 | struct sk_buff *skb; |
| 762 | |
| 763 | local = rx->local; |
| 764 | skb = rx->skb; |
| 765 | hdr = (struct ieee80211_hdr *) skb->data; |
| 766 | |
| 767 | if (!local->pspolling) |
| 768 | return RX_CONTINUE; |
| 769 | |
| 770 | if (!ieee80211_has_fromds(hdr->frame_control)) |
| 771 | /* this is not from AP */ |
| 772 | return RX_CONTINUE; |
| 773 | |
| 774 | if (!ieee80211_is_data(hdr->frame_control)) |
| 775 | return RX_CONTINUE; |
| 776 | |
| 777 | if (!ieee80211_has_moredata(hdr->frame_control)) { |
| 778 | /* AP has no more frames buffered for us */ |
| 779 | local->pspolling = false; |
| 780 | return RX_CONTINUE; |
| 781 | } |
| 782 | |
| 783 | /* more data bit is set, let's request a new frame from the AP */ |
| 784 | ieee80211_send_pspoll(local, rx->sdata); |
| 785 | |
| 786 | return RX_CONTINUE; |
| 787 | } |
| 788 | |
| 789 | static void ap_sta_ps_start(struct sta_info *sta) |
| 790 | { |
| 791 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 792 | struct ieee80211_local *local = sdata->local; |
| 793 | |
| 794 | atomic_inc(&sdata->bss->num_sta_ps); |
| 795 | set_sta_flags(sta, WLAN_STA_PS); |
| 796 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_SLEEP, &sta->sta); |
| 797 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| 798 | printk(KERN_DEBUG "%s: STA %pM aid %d enters power save mode\n", |
| 799 | sdata->dev->name, sta->sta.addr, sta->sta.aid); |
| 800 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 801 | } |
| 802 | |
| 803 | static int ap_sta_ps_end(struct sta_info *sta) |
| 804 | { |
| 805 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
| 806 | struct ieee80211_local *local = sdata->local; |
| 807 | int sent, buffered; |
| 808 | |
| 809 | atomic_dec(&sdata->bss->num_sta_ps); |
| 810 | |
| 811 | clear_sta_flags(sta, WLAN_STA_PS); |
| 812 | drv_sta_notify(local, &sdata->vif, STA_NOTIFY_AWAKE, &sta->sta); |
| 813 | |
| 814 | if (!skb_queue_empty(&sta->ps_tx_buf)) |
| 815 | sta_info_clear_tim_bit(sta); |
| 816 | |
| 817 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| 818 | printk(KERN_DEBUG "%s: STA %pM aid %d exits power save mode\n", |
| 819 | sdata->dev->name, sta->sta.addr, sta->sta.aid); |
| 820 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 821 | |
| 822 | /* Send all buffered frames to the station */ |
| 823 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); |
| 824 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); |
| 825 | sent += buffered; |
| 826 | local->total_ps_buffered -= buffered; |
| 827 | |
| 828 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| 829 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
| 830 | "since STA not sleeping anymore\n", sdata->dev->name, |
| 831 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); |
| 832 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 833 | |
| 834 | return sent; |
| 835 | } |
| 836 | |
| 837 | static ieee80211_rx_result debug_noinline |
| 838 | ieee80211_rx_h_sta_process(struct ieee80211_rx_data *rx) |
| 839 | { |
| 840 | struct sta_info *sta = rx->sta; |
| 841 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 842 | |
| 843 | if (!sta) |
| 844 | return RX_CONTINUE; |
| 845 | |
| 846 | /* |
| 847 | * Update last_rx only for IBSS packets which are for the current |
| 848 | * BSSID to avoid keeping the current IBSS network alive in cases |
| 849 | * where other STAs start using different BSSID. |
| 850 | */ |
| 851 | if (rx->sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
| 852 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, |
| 853 | NL80211_IFTYPE_ADHOC); |
| 854 | if (compare_ether_addr(bssid, rx->sdata->u.ibss.bssid) == 0) |
| 855 | sta->last_rx = jiffies; |
| 856 | } else if (!is_multicast_ether_addr(hdr->addr1)) { |
| 857 | /* |
| 858 | * Mesh beacons will update last_rx when if they are found to |
| 859 | * match the current local configuration when processed. |
| 860 | */ |
| 861 | sta->last_rx = jiffies; |
| 862 | } |
| 863 | |
| 864 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| 865 | return RX_CONTINUE; |
| 866 | |
| 867 | if (rx->sdata->vif.type == NL80211_IFTYPE_STATION) |
| 868 | ieee80211_sta_rx_notify(rx->sdata, hdr); |
| 869 | |
| 870 | sta->rx_fragments++; |
| 871 | sta->rx_bytes += rx->skb->len; |
| 872 | sta->last_signal = rx->status->signal; |
| 873 | sta->last_qual = rx->status->qual; |
| 874 | sta->last_noise = rx->status->noise; |
| 875 | |
| 876 | /* |
| 877 | * Change STA power saving mode only at the end of a frame |
| 878 | * exchange sequence. |
| 879 | */ |
| 880 | if (!ieee80211_has_morefrags(hdr->frame_control) && |
| 881 | (rx->sdata->vif.type == NL80211_IFTYPE_AP || |
| 882 | rx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)) { |
| 883 | if (test_sta_flags(sta, WLAN_STA_PS)) { |
| 884 | /* |
| 885 | * Ignore doze->wake transitions that are |
| 886 | * indicated by non-data frames, the standard |
| 887 | * is unclear here, but for example going to |
| 888 | * PS mode and then scanning would cause a |
| 889 | * doze->wake transition for the probe request, |
| 890 | * and that is clearly undesirable. |
| 891 | */ |
| 892 | if (ieee80211_is_data(hdr->frame_control) && |
| 893 | !ieee80211_has_pm(hdr->frame_control)) |
| 894 | rx->sent_ps_buffered += ap_sta_ps_end(sta); |
| 895 | } else { |
| 896 | if (ieee80211_has_pm(hdr->frame_control)) |
| 897 | ap_sta_ps_start(sta); |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | /* Drop data::nullfunc frames silently, since they are used only to |
| 902 | * control station power saving mode. */ |
| 903 | if (ieee80211_is_nullfunc(hdr->frame_control)) { |
| 904 | I802_DEBUG_INC(rx->local->rx_handlers_drop_nullfunc); |
| 905 | /* Update counter and free packet here to avoid counting this |
| 906 | * as a dropped packed. */ |
| 907 | sta->rx_packets++; |
| 908 | dev_kfree_skb(rx->skb); |
| 909 | return RX_QUEUED; |
| 910 | } |
| 911 | |
| 912 | return RX_CONTINUE; |
| 913 | } /* ieee80211_rx_h_sta_process */ |
| 914 | |
| 915 | static inline struct ieee80211_fragment_entry * |
| 916 | ieee80211_reassemble_add(struct ieee80211_sub_if_data *sdata, |
| 917 | unsigned int frag, unsigned int seq, int rx_queue, |
| 918 | struct sk_buff **skb) |
| 919 | { |
| 920 | struct ieee80211_fragment_entry *entry; |
| 921 | int idx; |
| 922 | |
| 923 | idx = sdata->fragment_next; |
| 924 | entry = &sdata->fragments[sdata->fragment_next++]; |
| 925 | if (sdata->fragment_next >= IEEE80211_FRAGMENT_MAX) |
| 926 | sdata->fragment_next = 0; |
| 927 | |
| 928 | if (!skb_queue_empty(&entry->skb_list)) { |
| 929 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
| 930 | struct ieee80211_hdr *hdr = |
| 931 | (struct ieee80211_hdr *) entry->skb_list.next->data; |
| 932 | printk(KERN_DEBUG "%s: RX reassembly removed oldest " |
| 933 | "fragment entry (idx=%d age=%lu seq=%d last_frag=%d " |
| 934 | "addr1=%pM addr2=%pM\n", |
| 935 | sdata->dev->name, idx, |
| 936 | jiffies - entry->first_frag_time, entry->seq, |
| 937 | entry->last_frag, hdr->addr1, hdr->addr2); |
| 938 | #endif |
| 939 | __skb_queue_purge(&entry->skb_list); |
| 940 | } |
| 941 | |
| 942 | __skb_queue_tail(&entry->skb_list, *skb); /* no need for locking */ |
| 943 | *skb = NULL; |
| 944 | entry->first_frag_time = jiffies; |
| 945 | entry->seq = seq; |
| 946 | entry->rx_queue = rx_queue; |
| 947 | entry->last_frag = frag; |
| 948 | entry->ccmp = 0; |
| 949 | entry->extra_len = 0; |
| 950 | |
| 951 | return entry; |
| 952 | } |
| 953 | |
| 954 | static inline struct ieee80211_fragment_entry * |
| 955 | ieee80211_reassemble_find(struct ieee80211_sub_if_data *sdata, |
| 956 | unsigned int frag, unsigned int seq, |
| 957 | int rx_queue, struct ieee80211_hdr *hdr) |
| 958 | { |
| 959 | struct ieee80211_fragment_entry *entry; |
| 960 | int i, idx; |
| 961 | |
| 962 | idx = sdata->fragment_next; |
| 963 | for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++) { |
| 964 | struct ieee80211_hdr *f_hdr; |
| 965 | |
| 966 | idx--; |
| 967 | if (idx < 0) |
| 968 | idx = IEEE80211_FRAGMENT_MAX - 1; |
| 969 | |
| 970 | entry = &sdata->fragments[idx]; |
| 971 | if (skb_queue_empty(&entry->skb_list) || entry->seq != seq || |
| 972 | entry->rx_queue != rx_queue || |
| 973 | entry->last_frag + 1 != frag) |
| 974 | continue; |
| 975 | |
| 976 | f_hdr = (struct ieee80211_hdr *)entry->skb_list.next->data; |
| 977 | |
| 978 | /* |
| 979 | * Check ftype and addresses are equal, else check next fragment |
| 980 | */ |
| 981 | if (((hdr->frame_control ^ f_hdr->frame_control) & |
| 982 | cpu_to_le16(IEEE80211_FCTL_FTYPE)) || |
| 983 | compare_ether_addr(hdr->addr1, f_hdr->addr1) != 0 || |
| 984 | compare_ether_addr(hdr->addr2, f_hdr->addr2) != 0) |
| 985 | continue; |
| 986 | |
| 987 | if (time_after(jiffies, entry->first_frag_time + 2 * HZ)) { |
| 988 | __skb_queue_purge(&entry->skb_list); |
| 989 | continue; |
| 990 | } |
| 991 | return entry; |
| 992 | } |
| 993 | |
| 994 | return NULL; |
| 995 | } |
| 996 | |
| 997 | static ieee80211_rx_result debug_noinline |
| 998 | ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx) |
| 999 | { |
| 1000 | struct ieee80211_hdr *hdr; |
| 1001 | u16 sc; |
| 1002 | __le16 fc; |
| 1003 | unsigned int frag, seq; |
| 1004 | struct ieee80211_fragment_entry *entry; |
| 1005 | struct sk_buff *skb; |
| 1006 | |
| 1007 | hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 1008 | fc = hdr->frame_control; |
| 1009 | sc = le16_to_cpu(hdr->seq_ctrl); |
| 1010 | frag = sc & IEEE80211_SCTL_FRAG; |
| 1011 | |
| 1012 | if (likely((!ieee80211_has_morefrags(fc) && frag == 0) || |
| 1013 | (rx->skb)->len < 24 || |
| 1014 | is_multicast_ether_addr(hdr->addr1))) { |
| 1015 | /* not fragmented */ |
| 1016 | goto out; |
| 1017 | } |
| 1018 | I802_DEBUG_INC(rx->local->rx_handlers_fragments); |
| 1019 | |
| 1020 | seq = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| 1021 | |
| 1022 | if (frag == 0) { |
| 1023 | /* This is the first fragment of a new frame. */ |
| 1024 | entry = ieee80211_reassemble_add(rx->sdata, frag, seq, |
| 1025 | rx->queue, &(rx->skb)); |
| 1026 | if (rx->key && rx->key->conf.alg == ALG_CCMP && |
| 1027 | ieee80211_has_protected(fc)) { |
| 1028 | /* Store CCMP PN so that we can verify that the next |
| 1029 | * fragment has a sequential PN value. */ |
| 1030 | entry->ccmp = 1; |
| 1031 | memcpy(entry->last_pn, |
| 1032 | rx->key->u.ccmp.rx_pn[rx->queue], |
| 1033 | CCMP_PN_LEN); |
| 1034 | } |
| 1035 | return RX_QUEUED; |
| 1036 | } |
| 1037 | |
| 1038 | /* This is a fragment for a frame that should already be pending in |
| 1039 | * fragment cache. Add this fragment to the end of the pending entry. |
| 1040 | */ |
| 1041 | entry = ieee80211_reassemble_find(rx->sdata, frag, seq, rx->queue, hdr); |
| 1042 | if (!entry) { |
| 1043 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
| 1044 | return RX_DROP_MONITOR; |
| 1045 | } |
| 1046 | |
| 1047 | /* Verify that MPDUs within one MSDU have sequential PN values. |
| 1048 | * (IEEE 802.11i, 8.3.3.4.5) */ |
| 1049 | if (entry->ccmp) { |
| 1050 | int i; |
| 1051 | u8 pn[CCMP_PN_LEN], *rpn; |
| 1052 | if (!rx->key || rx->key->conf.alg != ALG_CCMP) |
| 1053 | return RX_DROP_UNUSABLE; |
| 1054 | memcpy(pn, entry->last_pn, CCMP_PN_LEN); |
| 1055 | for (i = CCMP_PN_LEN - 1; i >= 0; i--) { |
| 1056 | pn[i]++; |
| 1057 | if (pn[i]) |
| 1058 | break; |
| 1059 | } |
| 1060 | rpn = rx->key->u.ccmp.rx_pn[rx->queue]; |
| 1061 | if (memcmp(pn, rpn, CCMP_PN_LEN)) |
| 1062 | return RX_DROP_UNUSABLE; |
| 1063 | memcpy(entry->last_pn, pn, CCMP_PN_LEN); |
| 1064 | } |
| 1065 | |
| 1066 | skb_pull(rx->skb, ieee80211_hdrlen(fc)); |
| 1067 | __skb_queue_tail(&entry->skb_list, rx->skb); |
| 1068 | entry->last_frag = frag; |
| 1069 | entry->extra_len += rx->skb->len; |
| 1070 | if (ieee80211_has_morefrags(fc)) { |
| 1071 | rx->skb = NULL; |
| 1072 | return RX_QUEUED; |
| 1073 | } |
| 1074 | |
| 1075 | rx->skb = __skb_dequeue(&entry->skb_list); |
| 1076 | if (skb_tailroom(rx->skb) < entry->extra_len) { |
| 1077 | I802_DEBUG_INC(rx->local->rx_expand_skb_head2); |
| 1078 | if (unlikely(pskb_expand_head(rx->skb, 0, entry->extra_len, |
| 1079 | GFP_ATOMIC))) { |
| 1080 | I802_DEBUG_INC(rx->local->rx_handlers_drop_defrag); |
| 1081 | __skb_queue_purge(&entry->skb_list); |
| 1082 | return RX_DROP_UNUSABLE; |
| 1083 | } |
| 1084 | } |
| 1085 | while ((skb = __skb_dequeue(&entry->skb_list))) { |
| 1086 | memcpy(skb_put(rx->skb, skb->len), skb->data, skb->len); |
| 1087 | dev_kfree_skb(skb); |
| 1088 | } |
| 1089 | |
| 1090 | /* Complete frame has been reassembled - process it now */ |
| 1091 | rx->flags |= IEEE80211_RX_FRAGMENTED; |
| 1092 | |
| 1093 | out: |
| 1094 | if (rx->sta) |
| 1095 | rx->sta->rx_packets++; |
| 1096 | if (is_multicast_ether_addr(hdr->addr1)) |
| 1097 | rx->local->dot11MulticastReceivedFrameCount++; |
| 1098 | else |
| 1099 | ieee80211_led_rx(rx->local); |
| 1100 | return RX_CONTINUE; |
| 1101 | } |
| 1102 | |
| 1103 | static ieee80211_rx_result debug_noinline |
| 1104 | ieee80211_rx_h_ps_poll(struct ieee80211_rx_data *rx) |
| 1105 | { |
| 1106 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| 1107 | struct sk_buff *skb; |
| 1108 | int no_pending_pkts; |
| 1109 | __le16 fc = ((struct ieee80211_hdr *)rx->skb->data)->frame_control; |
| 1110 | |
| 1111 | if (likely(!rx->sta || !ieee80211_is_pspoll(fc) || |
| 1112 | !(rx->flags & IEEE80211_RX_RA_MATCH))) |
| 1113 | return RX_CONTINUE; |
| 1114 | |
| 1115 | if ((sdata->vif.type != NL80211_IFTYPE_AP) && |
| 1116 | (sdata->vif.type != NL80211_IFTYPE_AP_VLAN)) |
| 1117 | return RX_DROP_UNUSABLE; |
| 1118 | |
| 1119 | skb = skb_dequeue(&rx->sta->tx_filtered); |
| 1120 | if (!skb) { |
| 1121 | skb = skb_dequeue(&rx->sta->ps_tx_buf); |
| 1122 | if (skb) |
| 1123 | rx->local->total_ps_buffered--; |
| 1124 | } |
| 1125 | no_pending_pkts = skb_queue_empty(&rx->sta->tx_filtered) && |
| 1126 | skb_queue_empty(&rx->sta->ps_tx_buf); |
| 1127 | |
| 1128 | if (skb) { |
| 1129 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
| 1130 | struct ieee80211_hdr *hdr = |
| 1131 | (struct ieee80211_hdr *) skb->data; |
| 1132 | |
| 1133 | /* |
| 1134 | * Tell TX path to send this frame even though the STA may |
| 1135 | * still remain is PS mode after this frame exchange. |
| 1136 | */ |
| 1137 | info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; |
| 1138 | |
| 1139 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| 1140 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", |
| 1141 | rx->sta->sta.addr, rx->sta->sta.aid, |
| 1142 | skb_queue_len(&rx->sta->ps_tx_buf)); |
| 1143 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 1144 | |
| 1145 | /* Use MoreData flag to indicate whether there are more |
| 1146 | * buffered frames for this STA */ |
| 1147 | if (no_pending_pkts) |
| 1148 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
| 1149 | else |
| 1150 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
| 1151 | |
| 1152 | ieee80211_add_pending_skb(rx->local, skb); |
| 1153 | |
| 1154 | if (no_pending_pkts) |
| 1155 | sta_info_clear_tim_bit(rx->sta); |
| 1156 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
| 1157 | } else if (!rx->sent_ps_buffered) { |
| 1158 | /* |
| 1159 | * FIXME: This can be the result of a race condition between |
| 1160 | * us expiring a frame and the station polling for it. |
| 1161 | * Should we send it a null-func frame indicating we |
| 1162 | * have nothing buffered for it? |
| 1163 | */ |
| 1164 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " |
| 1165 | "though there are no buffered frames for it\n", |
| 1166 | rx->dev->name, rx->sta->sta.addr); |
| 1167 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
| 1168 | } |
| 1169 | |
| 1170 | /* Free PS Poll skb here instead of returning RX_DROP that would |
| 1171 | * count as an dropped frame. */ |
| 1172 | dev_kfree_skb(rx->skb); |
| 1173 | |
| 1174 | return RX_QUEUED; |
| 1175 | } |
| 1176 | |
| 1177 | static ieee80211_rx_result debug_noinline |
| 1178 | ieee80211_rx_h_remove_qos_control(struct ieee80211_rx_data *rx) |
| 1179 | { |
| 1180 | u8 *data = rx->skb->data; |
| 1181 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)data; |
| 1182 | |
| 1183 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
| 1184 | return RX_CONTINUE; |
| 1185 | |
| 1186 | /* remove the qos control field, update frame type and meta-data */ |
| 1187 | memmove(data + IEEE80211_QOS_CTL_LEN, data, |
| 1188 | ieee80211_hdrlen(hdr->frame_control) - IEEE80211_QOS_CTL_LEN); |
| 1189 | hdr = (struct ieee80211_hdr *)skb_pull(rx->skb, IEEE80211_QOS_CTL_LEN); |
| 1190 | /* change frame type to non QOS */ |
| 1191 | hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA); |
| 1192 | |
| 1193 | return RX_CONTINUE; |
| 1194 | } |
| 1195 | |
| 1196 | static int |
| 1197 | ieee80211_802_1x_port_control(struct ieee80211_rx_data *rx) |
| 1198 | { |
| 1199 | if (unlikely(!rx->sta || |
| 1200 | !test_sta_flags(rx->sta, WLAN_STA_AUTHORIZED))) |
| 1201 | return -EACCES; |
| 1202 | |
| 1203 | return 0; |
| 1204 | } |
| 1205 | |
| 1206 | static int |
| 1207 | ieee80211_drop_unencrypted(struct ieee80211_rx_data *rx, __le16 fc) |
| 1208 | { |
| 1209 | /* |
| 1210 | * Pass through unencrypted frames if the hardware has |
| 1211 | * decrypted them already. |
| 1212 | */ |
| 1213 | if (rx->status->flag & RX_FLAG_DECRYPTED) |
| 1214 | return 0; |
| 1215 | |
| 1216 | /* Drop unencrypted frames if key is set. */ |
| 1217 | if (unlikely(!ieee80211_has_protected(fc) && |
| 1218 | !ieee80211_is_nullfunc(fc) && |
| 1219 | ieee80211_is_data(fc) && |
| 1220 | (rx->key || rx->sdata->drop_unencrypted))) |
| 1221 | return -EACCES; |
| 1222 | if (rx->sta && test_sta_flags(rx->sta, WLAN_STA_MFP)) { |
| 1223 | if (unlikely(ieee80211_is_unicast_robust_mgmt_frame(rx->skb) && |
| 1224 | rx->key)) |
| 1225 | return -EACCES; |
| 1226 | /* BIP does not use Protected field, so need to check MMIE */ |
| 1227 | if (unlikely(ieee80211_is_multicast_robust_mgmt_frame(rx->skb) |
| 1228 | && ieee80211_get_mmie_keyidx(rx->skb) < 0 && |
| 1229 | rx->key)) |
| 1230 | return -EACCES; |
| 1231 | /* |
| 1232 | * When using MFP, Action frames are not allowed prior to |
| 1233 | * having configured keys. |
| 1234 | */ |
| 1235 | if (unlikely(ieee80211_is_action(fc) && !rx->key && |
| 1236 | ieee80211_is_robust_mgmt_frame( |
| 1237 | (struct ieee80211_hdr *) rx->skb->data))) |
| 1238 | return -EACCES; |
| 1239 | } |
| 1240 | |
| 1241 | return 0; |
| 1242 | } |
| 1243 | |
| 1244 | static int |
| 1245 | __ieee80211_data_to_8023(struct ieee80211_rx_data *rx) |
| 1246 | { |
| 1247 | struct net_device *dev = rx->dev; |
| 1248 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 1249 | |
| 1250 | return ieee80211_data_to_8023(rx->skb, dev->dev_addr, sdata->vif.type); |
| 1251 | } |
| 1252 | |
| 1253 | /* |
| 1254 | * requires that rx->skb is a frame with ethernet header |
| 1255 | */ |
| 1256 | static bool ieee80211_frame_allowed(struct ieee80211_rx_data *rx, __le16 fc) |
| 1257 | { |
| 1258 | static const u8 pae_group_addr[ETH_ALEN] __aligned(2) |
| 1259 | = { 0x01, 0x80, 0xC2, 0x00, 0x00, 0x03 }; |
| 1260 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
| 1261 | |
| 1262 | /* |
| 1263 | * Allow EAPOL frames to us/the PAE group address regardless |
| 1264 | * of whether the frame was encrypted or not. |
| 1265 | */ |
| 1266 | if (ehdr->h_proto == htons(ETH_P_PAE) && |
| 1267 | (compare_ether_addr(ehdr->h_dest, rx->dev->dev_addr) == 0 || |
| 1268 | compare_ether_addr(ehdr->h_dest, pae_group_addr) == 0)) |
| 1269 | return true; |
| 1270 | |
| 1271 | if (ieee80211_802_1x_port_control(rx) || |
| 1272 | ieee80211_drop_unencrypted(rx, fc)) |
| 1273 | return false; |
| 1274 | |
| 1275 | return true; |
| 1276 | } |
| 1277 | |
| 1278 | /* |
| 1279 | * requires that rx->skb is a frame with ethernet header |
| 1280 | */ |
| 1281 | static void |
| 1282 | ieee80211_deliver_skb(struct ieee80211_rx_data *rx) |
| 1283 | { |
| 1284 | struct net_device *dev = rx->dev; |
| 1285 | struct ieee80211_local *local = rx->local; |
| 1286 | struct sk_buff *skb, *xmit_skb; |
| 1287 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev); |
| 1288 | struct ethhdr *ehdr = (struct ethhdr *) rx->skb->data; |
| 1289 | struct sta_info *dsta; |
| 1290 | |
| 1291 | skb = rx->skb; |
| 1292 | xmit_skb = NULL; |
| 1293 | |
| 1294 | if ((sdata->vif.type == NL80211_IFTYPE_AP || |
| 1295 | sdata->vif.type == NL80211_IFTYPE_AP_VLAN) && |
| 1296 | !(sdata->flags & IEEE80211_SDATA_DONT_BRIDGE_PACKETS) && |
| 1297 | (rx->flags & IEEE80211_RX_RA_MATCH)) { |
| 1298 | if (is_multicast_ether_addr(ehdr->h_dest)) { |
| 1299 | /* |
| 1300 | * send multicast frames both to higher layers in |
| 1301 | * local net stack and back to the wireless medium |
| 1302 | */ |
| 1303 | xmit_skb = skb_copy(skb, GFP_ATOMIC); |
| 1304 | if (!xmit_skb && net_ratelimit()) |
| 1305 | printk(KERN_DEBUG "%s: failed to clone " |
| 1306 | "multicast frame\n", dev->name); |
| 1307 | } else { |
| 1308 | dsta = sta_info_get(local, skb->data); |
| 1309 | if (dsta && dsta->sdata->dev == dev) { |
| 1310 | /* |
| 1311 | * The destination station is associated to |
| 1312 | * this AP (in this VLAN), so send the frame |
| 1313 | * directly to it and do not pass it to local |
| 1314 | * net stack. |
| 1315 | */ |
| 1316 | xmit_skb = skb; |
| 1317 | skb = NULL; |
| 1318 | } |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | if (skb) { |
| 1323 | int align __maybe_unused; |
| 1324 | |
| 1325 | #if defined(CONFIG_MAC80211_DEBUG_PACKET_ALIGNMENT) || !defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) |
| 1326 | /* |
| 1327 | * 'align' will only take the values 0 or 2 here |
| 1328 | * since all frames are required to be aligned |
| 1329 | * to 2-byte boundaries when being passed to |
| 1330 | * mac80211. That also explains the __skb_push() |
| 1331 | * below. |
| 1332 | */ |
| 1333 | align = ((unsigned long)(skb->data + sizeof(struct ethhdr))) & 3; |
| 1334 | if (align) { |
| 1335 | if (WARN_ON(skb_headroom(skb) < 3)) { |
| 1336 | dev_kfree_skb(skb); |
| 1337 | skb = NULL; |
| 1338 | } else { |
| 1339 | u8 *data = skb->data; |
| 1340 | size_t len = skb->len; |
| 1341 | u8 *new = __skb_push(skb, align); |
| 1342 | memmove(new, data, len); |
| 1343 | __skb_trim(skb, len); |
| 1344 | } |
| 1345 | } |
| 1346 | #endif |
| 1347 | |
| 1348 | if (skb) { |
| 1349 | /* deliver to local stack */ |
| 1350 | skb->protocol = eth_type_trans(skb, dev); |
| 1351 | memset(skb->cb, 0, sizeof(skb->cb)); |
| 1352 | netif_rx(skb); |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | if (xmit_skb) { |
| 1357 | /* send to wireless media */ |
| 1358 | xmit_skb->protocol = htons(ETH_P_802_3); |
| 1359 | skb_reset_network_header(xmit_skb); |
| 1360 | skb_reset_mac_header(xmit_skb); |
| 1361 | dev_queue_xmit(xmit_skb); |
| 1362 | } |
| 1363 | } |
| 1364 | |
| 1365 | static ieee80211_rx_result debug_noinline |
| 1366 | ieee80211_rx_h_amsdu(struct ieee80211_rx_data *rx) |
| 1367 | { |
| 1368 | struct net_device *dev = rx->dev; |
| 1369 | struct ieee80211_local *local = rx->local; |
| 1370 | u16 ethertype; |
| 1371 | u8 *payload; |
| 1372 | struct sk_buff *skb = rx->skb, *frame = NULL; |
| 1373 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; |
| 1374 | __le16 fc = hdr->frame_control; |
| 1375 | const struct ethhdr *eth; |
| 1376 | int remaining, err; |
| 1377 | u8 dst[ETH_ALEN]; |
| 1378 | u8 src[ETH_ALEN]; |
| 1379 | |
| 1380 | if (unlikely(!ieee80211_is_data(fc))) |
| 1381 | return RX_CONTINUE; |
| 1382 | |
| 1383 | if (unlikely(!ieee80211_is_data_present(fc))) |
| 1384 | return RX_DROP_MONITOR; |
| 1385 | |
| 1386 | if (!(rx->flags & IEEE80211_RX_AMSDU)) |
| 1387 | return RX_CONTINUE; |
| 1388 | |
| 1389 | err = __ieee80211_data_to_8023(rx); |
| 1390 | if (unlikely(err)) |
| 1391 | return RX_DROP_UNUSABLE; |
| 1392 | |
| 1393 | skb->dev = dev; |
| 1394 | |
| 1395 | dev->stats.rx_packets++; |
| 1396 | dev->stats.rx_bytes += skb->len; |
| 1397 | |
| 1398 | /* skip the wrapping header */ |
| 1399 | eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr)); |
| 1400 | if (!eth) |
| 1401 | return RX_DROP_UNUSABLE; |
| 1402 | |
| 1403 | while (skb != frame) { |
| 1404 | u8 padding; |
| 1405 | __be16 len = eth->h_proto; |
| 1406 | unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len); |
| 1407 | |
| 1408 | remaining = skb->len; |
| 1409 | memcpy(dst, eth->h_dest, ETH_ALEN); |
| 1410 | memcpy(src, eth->h_source, ETH_ALEN); |
| 1411 | |
| 1412 | padding = ((4 - subframe_len) & 0x3); |
| 1413 | /* the last MSDU has no padding */ |
| 1414 | if (subframe_len > remaining) |
| 1415 | return RX_DROP_UNUSABLE; |
| 1416 | |
| 1417 | skb_pull(skb, sizeof(struct ethhdr)); |
| 1418 | /* if last subframe reuse skb */ |
| 1419 | if (remaining <= subframe_len + padding) |
| 1420 | frame = skb; |
| 1421 | else { |
| 1422 | /* |
| 1423 | * Allocate and reserve two bytes more for payload |
| 1424 | * alignment since sizeof(struct ethhdr) is 14. |
| 1425 | */ |
| 1426 | frame = dev_alloc_skb( |
| 1427 | ALIGN(local->hw.extra_tx_headroom, 4) + |
| 1428 | subframe_len + 2); |
| 1429 | |
| 1430 | if (frame == NULL) |
| 1431 | return RX_DROP_UNUSABLE; |
| 1432 | |
| 1433 | skb_reserve(frame, |
| 1434 | ALIGN(local->hw.extra_tx_headroom, 4) + |
| 1435 | sizeof(struct ethhdr) + 2); |
| 1436 | memcpy(skb_put(frame, ntohs(len)), skb->data, |
| 1437 | ntohs(len)); |
| 1438 | |
| 1439 | eth = (struct ethhdr *) skb_pull(skb, ntohs(len) + |
| 1440 | padding); |
| 1441 | if (!eth) { |
| 1442 | dev_kfree_skb(frame); |
| 1443 | return RX_DROP_UNUSABLE; |
| 1444 | } |
| 1445 | } |
| 1446 | |
| 1447 | skb_reset_network_header(frame); |
| 1448 | frame->dev = dev; |
| 1449 | frame->priority = skb->priority; |
| 1450 | rx->skb = frame; |
| 1451 | |
| 1452 | payload = frame->data; |
| 1453 | ethertype = (payload[6] << 8) | payload[7]; |
| 1454 | |
| 1455 | if (likely((compare_ether_addr(payload, rfc1042_header) == 0 && |
| 1456 | ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) || |
| 1457 | compare_ether_addr(payload, |
| 1458 | bridge_tunnel_header) == 0)) { |
| 1459 | /* remove RFC1042 or Bridge-Tunnel |
| 1460 | * encapsulation and replace EtherType */ |
| 1461 | skb_pull(frame, 6); |
| 1462 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
| 1463 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
| 1464 | } else { |
| 1465 | memcpy(skb_push(frame, sizeof(__be16)), |
| 1466 | &len, sizeof(__be16)); |
| 1467 | memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN); |
| 1468 | memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN); |
| 1469 | } |
| 1470 | |
| 1471 | if (!ieee80211_frame_allowed(rx, fc)) { |
| 1472 | if (skb == frame) /* last frame */ |
| 1473 | return RX_DROP_UNUSABLE; |
| 1474 | dev_kfree_skb(frame); |
| 1475 | continue; |
| 1476 | } |
| 1477 | |
| 1478 | ieee80211_deliver_skb(rx); |
| 1479 | } |
| 1480 | |
| 1481 | return RX_QUEUED; |
| 1482 | } |
| 1483 | |
| 1484 | #ifdef CONFIG_MAC80211_MESH |
| 1485 | static ieee80211_rx_result |
| 1486 | ieee80211_rx_h_mesh_fwding(struct ieee80211_rx_data *rx) |
| 1487 | { |
| 1488 | struct ieee80211_hdr *hdr; |
| 1489 | struct ieee80211s_hdr *mesh_hdr; |
| 1490 | unsigned int hdrlen; |
| 1491 | struct sk_buff *skb = rx->skb, *fwd_skb; |
| 1492 | struct ieee80211_local *local = rx->local; |
| 1493 | struct ieee80211_sub_if_data *sdata; |
| 1494 | |
| 1495 | hdr = (struct ieee80211_hdr *) skb->data; |
| 1496 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 1497 | mesh_hdr = (struct ieee80211s_hdr *) (skb->data + hdrlen); |
| 1498 | sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| 1499 | |
| 1500 | if (!ieee80211_is_data(hdr->frame_control)) |
| 1501 | return RX_CONTINUE; |
| 1502 | |
| 1503 | if (!mesh_hdr->ttl) |
| 1504 | /* illegal frame */ |
| 1505 | return RX_DROP_MONITOR; |
| 1506 | |
| 1507 | if (!is_multicast_ether_addr(hdr->addr1) && |
| 1508 | (mesh_hdr->flags & MESH_FLAGS_AE_A5_A6)) { |
| 1509 | struct mesh_path *mppath; |
| 1510 | |
| 1511 | rcu_read_lock(); |
| 1512 | mppath = mpp_path_lookup(mesh_hdr->eaddr2, sdata); |
| 1513 | if (!mppath) { |
| 1514 | mpp_path_add(mesh_hdr->eaddr2, hdr->addr4, sdata); |
| 1515 | } else { |
| 1516 | spin_lock_bh(&mppath->state_lock); |
| 1517 | mppath->exp_time = jiffies; |
| 1518 | if (compare_ether_addr(mppath->mpp, hdr->addr4) != 0) |
| 1519 | memcpy(mppath->mpp, hdr->addr4, ETH_ALEN); |
| 1520 | spin_unlock_bh(&mppath->state_lock); |
| 1521 | } |
| 1522 | rcu_read_unlock(); |
| 1523 | } |
| 1524 | |
| 1525 | /* Frame has reached destination. Don't forward */ |
| 1526 | if (!is_multicast_ether_addr(hdr->addr1) && |
| 1527 | compare_ether_addr(rx->dev->dev_addr, hdr->addr3) == 0) |
| 1528 | return RX_CONTINUE; |
| 1529 | |
| 1530 | mesh_hdr->ttl--; |
| 1531 | |
| 1532 | if (rx->flags & IEEE80211_RX_RA_MATCH) { |
| 1533 | if (!mesh_hdr->ttl) |
| 1534 | IEEE80211_IFSTA_MESH_CTR_INC(&rx->sdata->u.mesh, |
| 1535 | dropped_frames_ttl); |
| 1536 | else { |
| 1537 | struct ieee80211_hdr *fwd_hdr; |
| 1538 | struct ieee80211_tx_info *info; |
| 1539 | |
| 1540 | fwd_skb = skb_copy(skb, GFP_ATOMIC); |
| 1541 | |
| 1542 | if (!fwd_skb && net_ratelimit()) |
| 1543 | printk(KERN_DEBUG "%s: failed to clone mesh frame\n", |
| 1544 | rx->dev->name); |
| 1545 | |
| 1546 | fwd_hdr = (struct ieee80211_hdr *) fwd_skb->data; |
| 1547 | memcpy(fwd_hdr->addr2, rx->dev->dev_addr, ETH_ALEN); |
| 1548 | info = IEEE80211_SKB_CB(fwd_skb); |
| 1549 | memset(info, 0, sizeof(*info)); |
| 1550 | info->flags |= IEEE80211_TX_INTFL_NEED_TXPROCESSING; |
| 1551 | info->control.vif = &rx->sdata->vif; |
| 1552 | ieee80211_select_queue(local, fwd_skb); |
| 1553 | if (is_multicast_ether_addr(fwd_hdr->addr1)) |
| 1554 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1555 | fwded_mcast); |
| 1556 | else { |
| 1557 | int err; |
| 1558 | /* |
| 1559 | * Save TA to addr1 to send TA a path error if a |
| 1560 | * suitable next hop is not found |
| 1561 | */ |
| 1562 | memcpy(fwd_hdr->addr1, fwd_hdr->addr2, |
| 1563 | ETH_ALEN); |
| 1564 | err = mesh_nexthop_lookup(fwd_skb, sdata); |
| 1565 | /* Failed to immediately resolve next hop: |
| 1566 | * fwded frame was dropped or will be added |
| 1567 | * later to the pending skb queue. */ |
| 1568 | if (err) |
| 1569 | return RX_DROP_MONITOR; |
| 1570 | |
| 1571 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1572 | fwded_unicast); |
| 1573 | } |
| 1574 | IEEE80211_IFSTA_MESH_CTR_INC(&sdata->u.mesh, |
| 1575 | fwded_frames); |
| 1576 | ieee80211_add_pending_skb(local, fwd_skb); |
| 1577 | } |
| 1578 | } |
| 1579 | |
| 1580 | if (is_multicast_ether_addr(hdr->addr1) || |
| 1581 | rx->dev->flags & IFF_PROMISC) |
| 1582 | return RX_CONTINUE; |
| 1583 | else |
| 1584 | return RX_DROP_MONITOR; |
| 1585 | } |
| 1586 | #endif |
| 1587 | |
| 1588 | static ieee80211_rx_result debug_noinline |
| 1589 | ieee80211_rx_h_data(struct ieee80211_rx_data *rx) |
| 1590 | { |
| 1591 | struct net_device *dev = rx->dev; |
| 1592 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data; |
| 1593 | __le16 fc = hdr->frame_control; |
| 1594 | int err; |
| 1595 | |
| 1596 | if (unlikely(!ieee80211_is_data(hdr->frame_control))) |
| 1597 | return RX_CONTINUE; |
| 1598 | |
| 1599 | if (unlikely(!ieee80211_is_data_present(hdr->frame_control))) |
| 1600 | return RX_DROP_MONITOR; |
| 1601 | |
| 1602 | err = __ieee80211_data_to_8023(rx); |
| 1603 | if (unlikely(err)) |
| 1604 | return RX_DROP_UNUSABLE; |
| 1605 | |
| 1606 | if (!ieee80211_frame_allowed(rx, fc)) |
| 1607 | return RX_DROP_MONITOR; |
| 1608 | |
| 1609 | rx->skb->dev = dev; |
| 1610 | |
| 1611 | dev->stats.rx_packets++; |
| 1612 | dev->stats.rx_bytes += rx->skb->len; |
| 1613 | |
| 1614 | ieee80211_deliver_skb(rx); |
| 1615 | |
| 1616 | return RX_QUEUED; |
| 1617 | } |
| 1618 | |
| 1619 | static ieee80211_rx_result debug_noinline |
| 1620 | ieee80211_rx_h_ctrl(struct ieee80211_rx_data *rx) |
| 1621 | { |
| 1622 | struct ieee80211_local *local = rx->local; |
| 1623 | struct ieee80211_hw *hw = &local->hw; |
| 1624 | struct sk_buff *skb = rx->skb; |
| 1625 | struct ieee80211_bar *bar = (struct ieee80211_bar *)skb->data; |
| 1626 | struct tid_ampdu_rx *tid_agg_rx; |
| 1627 | u16 start_seq_num; |
| 1628 | u16 tid; |
| 1629 | |
| 1630 | if (likely(!ieee80211_is_ctl(bar->frame_control))) |
| 1631 | return RX_CONTINUE; |
| 1632 | |
| 1633 | if (ieee80211_is_back_req(bar->frame_control)) { |
| 1634 | if (!rx->sta) |
| 1635 | return RX_CONTINUE; |
| 1636 | tid = le16_to_cpu(bar->control) >> 12; |
| 1637 | if (rx->sta->ampdu_mlme.tid_state_rx[tid] |
| 1638 | != HT_AGG_STATE_OPERATIONAL) |
| 1639 | return RX_CONTINUE; |
| 1640 | tid_agg_rx = rx->sta->ampdu_mlme.tid_rx[tid]; |
| 1641 | |
| 1642 | start_seq_num = le16_to_cpu(bar->start_seq_num) >> 4; |
| 1643 | |
| 1644 | /* reset session timer */ |
| 1645 | if (tid_agg_rx->timeout) |
| 1646 | mod_timer(&tid_agg_rx->session_timer, |
| 1647 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
| 1648 | |
| 1649 | /* manage reordering buffer according to requested */ |
| 1650 | /* sequence number */ |
| 1651 | rcu_read_lock(); |
| 1652 | ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, NULL, |
| 1653 | start_seq_num, 1); |
| 1654 | rcu_read_unlock(); |
| 1655 | return RX_DROP_UNUSABLE; |
| 1656 | } |
| 1657 | |
| 1658 | return RX_CONTINUE; |
| 1659 | } |
| 1660 | |
| 1661 | static void ieee80211_process_sa_query_req(struct ieee80211_sub_if_data *sdata, |
| 1662 | struct ieee80211_mgmt *mgmt, |
| 1663 | size_t len) |
| 1664 | { |
| 1665 | struct ieee80211_local *local = sdata->local; |
| 1666 | struct sk_buff *skb; |
| 1667 | struct ieee80211_mgmt *resp; |
| 1668 | |
| 1669 | if (compare_ether_addr(mgmt->da, sdata->dev->dev_addr) != 0) { |
| 1670 | /* Not to own unicast address */ |
| 1671 | return; |
| 1672 | } |
| 1673 | |
| 1674 | if (compare_ether_addr(mgmt->sa, sdata->u.mgd.bssid) != 0 || |
| 1675 | compare_ether_addr(mgmt->bssid, sdata->u.mgd.bssid) != 0) { |
| 1676 | /* Not from the current AP or not associated yet. */ |
| 1677 | return; |
| 1678 | } |
| 1679 | |
| 1680 | if (len < 24 + 1 + sizeof(resp->u.action.u.sa_query)) { |
| 1681 | /* Too short SA Query request frame */ |
| 1682 | return; |
| 1683 | } |
| 1684 | |
| 1685 | skb = dev_alloc_skb(sizeof(*resp) + local->hw.extra_tx_headroom); |
| 1686 | if (skb == NULL) |
| 1687 | return; |
| 1688 | |
| 1689 | skb_reserve(skb, local->hw.extra_tx_headroom); |
| 1690 | resp = (struct ieee80211_mgmt *) skb_put(skb, 24); |
| 1691 | memset(resp, 0, 24); |
| 1692 | memcpy(resp->da, mgmt->sa, ETH_ALEN); |
| 1693 | memcpy(resp->sa, sdata->dev->dev_addr, ETH_ALEN); |
| 1694 | memcpy(resp->bssid, sdata->u.mgd.bssid, ETH_ALEN); |
| 1695 | resp->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | |
| 1696 | IEEE80211_STYPE_ACTION); |
| 1697 | skb_put(skb, 1 + sizeof(resp->u.action.u.sa_query)); |
| 1698 | resp->u.action.category = WLAN_CATEGORY_SA_QUERY; |
| 1699 | resp->u.action.u.sa_query.action = WLAN_ACTION_SA_QUERY_RESPONSE; |
| 1700 | memcpy(resp->u.action.u.sa_query.trans_id, |
| 1701 | mgmt->u.action.u.sa_query.trans_id, |
| 1702 | WLAN_SA_QUERY_TR_ID_LEN); |
| 1703 | |
| 1704 | ieee80211_tx_skb(sdata, skb, 1); |
| 1705 | } |
| 1706 | |
| 1707 | static ieee80211_rx_result debug_noinline |
| 1708 | ieee80211_rx_h_action(struct ieee80211_rx_data *rx) |
| 1709 | { |
| 1710 | struct ieee80211_local *local = rx->local; |
| 1711 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| 1712 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
| 1713 | int len = rx->skb->len; |
| 1714 | |
| 1715 | if (!ieee80211_is_action(mgmt->frame_control)) |
| 1716 | return RX_CONTINUE; |
| 1717 | |
| 1718 | if (!rx->sta) |
| 1719 | return RX_DROP_MONITOR; |
| 1720 | |
| 1721 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| 1722 | return RX_DROP_MONITOR; |
| 1723 | |
| 1724 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
| 1725 | return RX_DROP_MONITOR; |
| 1726 | |
| 1727 | /* all categories we currently handle have action_code */ |
| 1728 | if (len < IEEE80211_MIN_ACTION_SIZE + 1) |
| 1729 | return RX_DROP_MONITOR; |
| 1730 | |
| 1731 | switch (mgmt->u.action.category) { |
| 1732 | case WLAN_CATEGORY_BACK: |
| 1733 | /* |
| 1734 | * The aggregation code is not prepared to handle |
| 1735 | * anything but STA/AP due to the BSSID handling; |
| 1736 | * IBSS could work in the code but isn't supported |
| 1737 | * by drivers or the standard. |
| 1738 | */ |
| 1739 | if (sdata->vif.type != NL80211_IFTYPE_STATION && |
| 1740 | sdata->vif.type != NL80211_IFTYPE_AP_VLAN && |
| 1741 | sdata->vif.type != NL80211_IFTYPE_AP) |
| 1742 | return RX_DROP_MONITOR; |
| 1743 | |
| 1744 | switch (mgmt->u.action.u.addba_req.action_code) { |
| 1745 | case WLAN_ACTION_ADDBA_REQ: |
| 1746 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1747 | sizeof(mgmt->u.action.u.addba_req))) |
| 1748 | return RX_DROP_MONITOR; |
| 1749 | ieee80211_process_addba_request(local, rx->sta, mgmt, len); |
| 1750 | break; |
| 1751 | case WLAN_ACTION_ADDBA_RESP: |
| 1752 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1753 | sizeof(mgmt->u.action.u.addba_resp))) |
| 1754 | return RX_DROP_MONITOR; |
| 1755 | ieee80211_process_addba_resp(local, rx->sta, mgmt, len); |
| 1756 | break; |
| 1757 | case WLAN_ACTION_DELBA: |
| 1758 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1759 | sizeof(mgmt->u.action.u.delba))) |
| 1760 | return RX_DROP_MONITOR; |
| 1761 | ieee80211_process_delba(sdata, rx->sta, mgmt, len); |
| 1762 | break; |
| 1763 | } |
| 1764 | break; |
| 1765 | case WLAN_CATEGORY_SPECTRUM_MGMT: |
| 1766 | if (local->hw.conf.channel->band != IEEE80211_BAND_5GHZ) |
| 1767 | return RX_DROP_MONITOR; |
| 1768 | |
| 1769 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| 1770 | return RX_DROP_MONITOR; |
| 1771 | |
| 1772 | switch (mgmt->u.action.u.measurement.action_code) { |
| 1773 | case WLAN_ACTION_SPCT_MSR_REQ: |
| 1774 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1775 | sizeof(mgmt->u.action.u.measurement))) |
| 1776 | return RX_DROP_MONITOR; |
| 1777 | ieee80211_process_measurement_req(sdata, mgmt, len); |
| 1778 | break; |
| 1779 | case WLAN_ACTION_SPCT_CHL_SWITCH: |
| 1780 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1781 | sizeof(mgmt->u.action.u.chan_switch))) |
| 1782 | return RX_DROP_MONITOR; |
| 1783 | |
| 1784 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| 1785 | return RX_DROP_MONITOR; |
| 1786 | |
| 1787 | if (memcmp(mgmt->bssid, sdata->u.mgd.bssid, ETH_ALEN)) |
| 1788 | return RX_DROP_MONITOR; |
| 1789 | |
| 1790 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
| 1791 | } |
| 1792 | break; |
| 1793 | case WLAN_CATEGORY_SA_QUERY: |
| 1794 | if (len < (IEEE80211_MIN_ACTION_SIZE + |
| 1795 | sizeof(mgmt->u.action.u.sa_query))) |
| 1796 | return RX_DROP_MONITOR; |
| 1797 | switch (mgmt->u.action.u.sa_query.action) { |
| 1798 | case WLAN_ACTION_SA_QUERY_REQUEST: |
| 1799 | if (sdata->vif.type != NL80211_IFTYPE_STATION) |
| 1800 | return RX_DROP_MONITOR; |
| 1801 | ieee80211_process_sa_query_req(sdata, mgmt, len); |
| 1802 | break; |
| 1803 | case WLAN_ACTION_SA_QUERY_RESPONSE: |
| 1804 | /* |
| 1805 | * SA Query response is currently only used in AP mode |
| 1806 | * and it is processed in user space. |
| 1807 | */ |
| 1808 | return RX_CONTINUE; |
| 1809 | } |
| 1810 | break; |
| 1811 | default: |
| 1812 | return RX_CONTINUE; |
| 1813 | } |
| 1814 | |
| 1815 | rx->sta->rx_packets++; |
| 1816 | dev_kfree_skb(rx->skb); |
| 1817 | return RX_QUEUED; |
| 1818 | } |
| 1819 | |
| 1820 | static ieee80211_rx_result debug_noinline |
| 1821 | ieee80211_rx_h_mgmt(struct ieee80211_rx_data *rx) |
| 1822 | { |
| 1823 | struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(rx->dev); |
| 1824 | struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *) rx->skb->data; |
| 1825 | |
| 1826 | if (!(rx->flags & IEEE80211_RX_RA_MATCH)) |
| 1827 | return RX_DROP_MONITOR; |
| 1828 | |
| 1829 | if (ieee80211_drop_unencrypted(rx, mgmt->frame_control)) |
| 1830 | return RX_DROP_MONITOR; |
| 1831 | |
| 1832 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
| 1833 | return ieee80211_mesh_rx_mgmt(sdata, rx->skb); |
| 1834 | |
| 1835 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) |
| 1836 | return ieee80211_ibss_rx_mgmt(sdata, rx->skb); |
| 1837 | |
| 1838 | if (sdata->vif.type == NL80211_IFTYPE_STATION) |
| 1839 | return ieee80211_sta_rx_mgmt(sdata, rx->skb); |
| 1840 | |
| 1841 | return RX_DROP_MONITOR; |
| 1842 | } |
| 1843 | |
| 1844 | static void ieee80211_rx_michael_mic_report(struct ieee80211_hdr *hdr, |
| 1845 | struct ieee80211_rx_data *rx) |
| 1846 | { |
| 1847 | int keyidx; |
| 1848 | unsigned int hdrlen; |
| 1849 | |
| 1850 | hdrlen = ieee80211_hdrlen(hdr->frame_control); |
| 1851 | if (rx->skb->len >= hdrlen + 4) |
| 1852 | keyidx = rx->skb->data[hdrlen + 3] >> 6; |
| 1853 | else |
| 1854 | keyidx = -1; |
| 1855 | |
| 1856 | if (!rx->sta) { |
| 1857 | /* |
| 1858 | * Some hardware seem to generate incorrect Michael MIC |
| 1859 | * reports; ignore them to avoid triggering countermeasures. |
| 1860 | */ |
| 1861 | goto ignore; |
| 1862 | } |
| 1863 | |
| 1864 | if (!ieee80211_has_protected(hdr->frame_control)) |
| 1865 | goto ignore; |
| 1866 | |
| 1867 | if (rx->sdata->vif.type == NL80211_IFTYPE_AP && keyidx) { |
| 1868 | /* |
| 1869 | * APs with pairwise keys should never receive Michael MIC |
| 1870 | * errors for non-zero keyidx because these are reserved for |
| 1871 | * group keys and only the AP is sending real multicast |
| 1872 | * frames in the BSS. |
| 1873 | */ |
| 1874 | goto ignore; |
| 1875 | } |
| 1876 | |
| 1877 | if (!ieee80211_is_data(hdr->frame_control) && |
| 1878 | !ieee80211_is_auth(hdr->frame_control)) |
| 1879 | goto ignore; |
| 1880 | |
| 1881 | mac80211_ev_michael_mic_failure(rx->sdata, keyidx, hdr, NULL, |
| 1882 | GFP_ATOMIC); |
| 1883 | ignore: |
| 1884 | dev_kfree_skb(rx->skb); |
| 1885 | rx->skb = NULL; |
| 1886 | } |
| 1887 | |
| 1888 | /* TODO: use IEEE80211_RX_FRAGMENTED */ |
| 1889 | static void ieee80211_rx_cooked_monitor(struct ieee80211_rx_data *rx) |
| 1890 | { |
| 1891 | struct ieee80211_sub_if_data *sdata; |
| 1892 | struct ieee80211_local *local = rx->local; |
| 1893 | struct ieee80211_rtap_hdr { |
| 1894 | struct ieee80211_radiotap_header hdr; |
| 1895 | u8 flags; |
| 1896 | u8 rate; |
| 1897 | __le16 chan_freq; |
| 1898 | __le16 chan_flags; |
| 1899 | } __attribute__ ((packed)) *rthdr; |
| 1900 | struct sk_buff *skb = rx->skb, *skb2; |
| 1901 | struct net_device *prev_dev = NULL; |
| 1902 | struct ieee80211_rx_status *status = rx->status; |
| 1903 | |
| 1904 | if (rx->flags & IEEE80211_RX_CMNTR_REPORTED) |
| 1905 | goto out_free_skb; |
| 1906 | |
| 1907 | if (skb_headroom(skb) < sizeof(*rthdr) && |
| 1908 | pskb_expand_head(skb, sizeof(*rthdr), 0, GFP_ATOMIC)) |
| 1909 | goto out_free_skb; |
| 1910 | |
| 1911 | rthdr = (void *)skb_push(skb, sizeof(*rthdr)); |
| 1912 | memset(rthdr, 0, sizeof(*rthdr)); |
| 1913 | rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr)); |
| 1914 | rthdr->hdr.it_present = |
| 1915 | cpu_to_le32((1 << IEEE80211_RADIOTAP_FLAGS) | |
| 1916 | (1 << IEEE80211_RADIOTAP_RATE) | |
| 1917 | (1 << IEEE80211_RADIOTAP_CHANNEL)); |
| 1918 | |
| 1919 | rthdr->rate = rx->rate->bitrate / 5; |
| 1920 | rthdr->chan_freq = cpu_to_le16(status->freq); |
| 1921 | |
| 1922 | if (status->band == IEEE80211_BAND_5GHZ) |
| 1923 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_OFDM | |
| 1924 | IEEE80211_CHAN_5GHZ); |
| 1925 | else |
| 1926 | rthdr->chan_flags = cpu_to_le16(IEEE80211_CHAN_DYN | |
| 1927 | IEEE80211_CHAN_2GHZ); |
| 1928 | |
| 1929 | skb_set_mac_header(skb, 0); |
| 1930 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1931 | skb->pkt_type = PACKET_OTHERHOST; |
| 1932 | skb->protocol = htons(ETH_P_802_2); |
| 1933 | |
| 1934 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| 1935 | if (!netif_running(sdata->dev)) |
| 1936 | continue; |
| 1937 | |
| 1938 | if (sdata->vif.type != NL80211_IFTYPE_MONITOR || |
| 1939 | !(sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES)) |
| 1940 | continue; |
| 1941 | |
| 1942 | if (prev_dev) { |
| 1943 | skb2 = skb_clone(skb, GFP_ATOMIC); |
| 1944 | if (skb2) { |
| 1945 | skb2->dev = prev_dev; |
| 1946 | netif_rx(skb2); |
| 1947 | } |
| 1948 | } |
| 1949 | |
| 1950 | prev_dev = sdata->dev; |
| 1951 | sdata->dev->stats.rx_packets++; |
| 1952 | sdata->dev->stats.rx_bytes += skb->len; |
| 1953 | } |
| 1954 | |
| 1955 | if (prev_dev) { |
| 1956 | skb->dev = prev_dev; |
| 1957 | netif_rx(skb); |
| 1958 | skb = NULL; |
| 1959 | } else |
| 1960 | goto out_free_skb; |
| 1961 | |
| 1962 | rx->flags |= IEEE80211_RX_CMNTR_REPORTED; |
| 1963 | return; |
| 1964 | |
| 1965 | out_free_skb: |
| 1966 | dev_kfree_skb(skb); |
| 1967 | } |
| 1968 | |
| 1969 | |
| 1970 | static void ieee80211_invoke_rx_handlers(struct ieee80211_sub_if_data *sdata, |
| 1971 | struct ieee80211_rx_data *rx, |
| 1972 | struct sk_buff *skb) |
| 1973 | { |
| 1974 | ieee80211_rx_result res = RX_DROP_MONITOR; |
| 1975 | |
| 1976 | rx->skb = skb; |
| 1977 | rx->sdata = sdata; |
| 1978 | rx->dev = sdata->dev; |
| 1979 | |
| 1980 | #define CALL_RXH(rxh) \ |
| 1981 | do { \ |
| 1982 | res = rxh(rx); \ |
| 1983 | if (res != RX_CONTINUE) \ |
| 1984 | goto rxh_done; \ |
| 1985 | } while (0); |
| 1986 | |
| 1987 | CALL_RXH(ieee80211_rx_h_passive_scan) |
| 1988 | CALL_RXH(ieee80211_rx_h_check) |
| 1989 | CALL_RXH(ieee80211_rx_h_decrypt) |
| 1990 | CALL_RXH(ieee80211_rx_h_check_more_data) |
| 1991 | CALL_RXH(ieee80211_rx_h_sta_process) |
| 1992 | CALL_RXH(ieee80211_rx_h_defragment) |
| 1993 | CALL_RXH(ieee80211_rx_h_ps_poll) |
| 1994 | CALL_RXH(ieee80211_rx_h_michael_mic_verify) |
| 1995 | /* must be after MMIC verify so header is counted in MPDU mic */ |
| 1996 | CALL_RXH(ieee80211_rx_h_remove_qos_control) |
| 1997 | CALL_RXH(ieee80211_rx_h_amsdu) |
| 1998 | #ifdef CONFIG_MAC80211_MESH |
| 1999 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
| 2000 | CALL_RXH(ieee80211_rx_h_mesh_fwding); |
| 2001 | #endif |
| 2002 | CALL_RXH(ieee80211_rx_h_data) |
| 2003 | CALL_RXH(ieee80211_rx_h_ctrl) |
| 2004 | CALL_RXH(ieee80211_rx_h_action) |
| 2005 | CALL_RXH(ieee80211_rx_h_mgmt) |
| 2006 | |
| 2007 | #undef CALL_RXH |
| 2008 | |
| 2009 | rxh_done: |
| 2010 | switch (res) { |
| 2011 | case RX_DROP_MONITOR: |
| 2012 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
| 2013 | if (rx->sta) |
| 2014 | rx->sta->rx_dropped++; |
| 2015 | /* fall through */ |
| 2016 | case RX_CONTINUE: |
| 2017 | ieee80211_rx_cooked_monitor(rx); |
| 2018 | break; |
| 2019 | case RX_DROP_UNUSABLE: |
| 2020 | I802_DEBUG_INC(sdata->local->rx_handlers_drop); |
| 2021 | if (rx->sta) |
| 2022 | rx->sta->rx_dropped++; |
| 2023 | dev_kfree_skb(rx->skb); |
| 2024 | break; |
| 2025 | case RX_QUEUED: |
| 2026 | I802_DEBUG_INC(sdata->local->rx_handlers_queued); |
| 2027 | break; |
| 2028 | } |
| 2029 | } |
| 2030 | |
| 2031 | /* main receive path */ |
| 2032 | |
| 2033 | static int prepare_for_handlers(struct ieee80211_sub_if_data *sdata, |
| 2034 | struct ieee80211_rx_data *rx, |
| 2035 | struct ieee80211_hdr *hdr) |
| 2036 | { |
| 2037 | u8 *bssid = ieee80211_get_bssid(hdr, rx->skb->len, sdata->vif.type); |
| 2038 | int multicast = is_multicast_ether_addr(hdr->addr1); |
| 2039 | |
| 2040 | switch (sdata->vif.type) { |
| 2041 | case NL80211_IFTYPE_STATION: |
| 2042 | if (!bssid) |
| 2043 | return 0; |
| 2044 | if (!multicast && |
| 2045 | compare_ether_addr(sdata->dev->dev_addr, hdr->addr1) != 0) { |
| 2046 | if (!(sdata->dev->flags & IFF_PROMISC)) |
| 2047 | return 0; |
| 2048 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| 2049 | } |
| 2050 | break; |
| 2051 | case NL80211_IFTYPE_ADHOC: |
| 2052 | if (!bssid) |
| 2053 | return 0; |
| 2054 | if (ieee80211_is_beacon(hdr->frame_control)) { |
| 2055 | return 1; |
| 2056 | } |
| 2057 | else if (!ieee80211_bssid_match(bssid, sdata->u.ibss.bssid)) { |
| 2058 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
| 2059 | return 0; |
| 2060 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| 2061 | } else if (!multicast && |
| 2062 | compare_ether_addr(sdata->dev->dev_addr, |
| 2063 | hdr->addr1) != 0) { |
| 2064 | if (!(sdata->dev->flags & IFF_PROMISC)) |
| 2065 | return 0; |
| 2066 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| 2067 | } else if (!rx->sta) { |
| 2068 | int rate_idx; |
| 2069 | if (rx->status->flag & RX_FLAG_HT) |
| 2070 | rate_idx = 0; /* TODO: HT rates */ |
| 2071 | else |
| 2072 | rate_idx = rx->status->rate_idx; |
| 2073 | rx->sta = ieee80211_ibss_add_sta(sdata, bssid, hdr->addr2, |
| 2074 | BIT(rate_idx)); |
| 2075 | } |
| 2076 | break; |
| 2077 | case NL80211_IFTYPE_MESH_POINT: |
| 2078 | if (!multicast && |
| 2079 | compare_ether_addr(sdata->dev->dev_addr, |
| 2080 | hdr->addr1) != 0) { |
| 2081 | if (!(sdata->dev->flags & IFF_PROMISC)) |
| 2082 | return 0; |
| 2083 | |
| 2084 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| 2085 | } |
| 2086 | break; |
| 2087 | case NL80211_IFTYPE_AP_VLAN: |
| 2088 | case NL80211_IFTYPE_AP: |
| 2089 | if (!bssid) { |
| 2090 | if (compare_ether_addr(sdata->dev->dev_addr, |
| 2091 | hdr->addr1)) |
| 2092 | return 0; |
| 2093 | } else if (!ieee80211_bssid_match(bssid, |
| 2094 | sdata->dev->dev_addr)) { |
| 2095 | if (!(rx->flags & IEEE80211_RX_IN_SCAN)) |
| 2096 | return 0; |
| 2097 | rx->flags &= ~IEEE80211_RX_RA_MATCH; |
| 2098 | } |
| 2099 | break; |
| 2100 | case NL80211_IFTYPE_WDS: |
| 2101 | if (bssid || !ieee80211_is_data(hdr->frame_control)) |
| 2102 | return 0; |
| 2103 | if (compare_ether_addr(sdata->u.wds.remote_addr, hdr->addr2)) |
| 2104 | return 0; |
| 2105 | break; |
| 2106 | case NL80211_IFTYPE_MONITOR: |
| 2107 | /* take everything */ |
| 2108 | break; |
| 2109 | case NL80211_IFTYPE_UNSPECIFIED: |
| 2110 | case __NL80211_IFTYPE_AFTER_LAST: |
| 2111 | /* should never get here */ |
| 2112 | WARN_ON(1); |
| 2113 | break; |
| 2114 | } |
| 2115 | |
| 2116 | return 1; |
| 2117 | } |
| 2118 | |
| 2119 | /* |
| 2120 | * This is the actual Rx frames handler. as it blongs to Rx path it must |
| 2121 | * be called with rcu_read_lock protection. |
| 2122 | */ |
| 2123 | static void __ieee80211_rx_handle_packet(struct ieee80211_hw *hw, |
| 2124 | struct sk_buff *skb, |
| 2125 | struct ieee80211_rate *rate) |
| 2126 | { |
| 2127 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 2128 | struct ieee80211_local *local = hw_to_local(hw); |
| 2129 | struct ieee80211_sub_if_data *sdata; |
| 2130 | struct ieee80211_hdr *hdr; |
| 2131 | struct ieee80211_rx_data rx; |
| 2132 | int prepares; |
| 2133 | struct ieee80211_sub_if_data *prev = NULL; |
| 2134 | struct sk_buff *skb_new; |
| 2135 | |
| 2136 | hdr = (struct ieee80211_hdr *)skb->data; |
| 2137 | memset(&rx, 0, sizeof(rx)); |
| 2138 | rx.skb = skb; |
| 2139 | rx.local = local; |
| 2140 | |
| 2141 | rx.status = status; |
| 2142 | rx.rate = rate; |
| 2143 | |
| 2144 | if (ieee80211_is_data(hdr->frame_control) || ieee80211_is_mgmt(hdr->frame_control)) |
| 2145 | local->dot11ReceivedFragmentCount++; |
| 2146 | |
| 2147 | rx.sta = sta_info_get(local, hdr->addr2); |
| 2148 | if (rx.sta) { |
| 2149 | rx.sdata = rx.sta->sdata; |
| 2150 | rx.dev = rx.sta->sdata->dev; |
| 2151 | } |
| 2152 | |
| 2153 | if ((status->flag & RX_FLAG_MMIC_ERROR)) { |
| 2154 | ieee80211_rx_michael_mic_report(hdr, &rx); |
| 2155 | return; |
| 2156 | } |
| 2157 | |
| 2158 | if (unlikely(test_bit(SCAN_HW_SCANNING, &local->scanning) || |
| 2159 | test_bit(SCAN_OFF_CHANNEL, &local->scanning))) |
| 2160 | rx.flags |= IEEE80211_RX_IN_SCAN; |
| 2161 | |
| 2162 | ieee80211_parse_qos(&rx); |
| 2163 | ieee80211_verify_alignment(&rx); |
| 2164 | |
| 2165 | skb = rx.skb; |
| 2166 | |
| 2167 | list_for_each_entry_rcu(sdata, &local->interfaces, list) { |
| 2168 | if (!netif_running(sdata->dev)) |
| 2169 | continue; |
| 2170 | |
| 2171 | if (sdata->vif.type == NL80211_IFTYPE_MONITOR) |
| 2172 | continue; |
| 2173 | |
| 2174 | rx.flags |= IEEE80211_RX_RA_MATCH; |
| 2175 | prepares = prepare_for_handlers(sdata, &rx, hdr); |
| 2176 | |
| 2177 | if (!prepares) |
| 2178 | continue; |
| 2179 | |
| 2180 | /* |
| 2181 | * frame is destined for this interface, but if it's not |
| 2182 | * also for the previous one we handle that after the |
| 2183 | * loop to avoid copying the SKB once too much |
| 2184 | */ |
| 2185 | |
| 2186 | if (!prev) { |
| 2187 | prev = sdata; |
| 2188 | continue; |
| 2189 | } |
| 2190 | |
| 2191 | /* |
| 2192 | * frame was destined for the previous interface |
| 2193 | * so invoke RX handlers for it |
| 2194 | */ |
| 2195 | |
| 2196 | skb_new = skb_copy(skb, GFP_ATOMIC); |
| 2197 | if (!skb_new) { |
| 2198 | if (net_ratelimit()) |
| 2199 | printk(KERN_DEBUG "%s: failed to copy " |
| 2200 | "multicast frame for %s\n", |
| 2201 | wiphy_name(local->hw.wiphy), |
| 2202 | prev->dev->name); |
| 2203 | continue; |
| 2204 | } |
| 2205 | ieee80211_invoke_rx_handlers(prev, &rx, skb_new); |
| 2206 | prev = sdata; |
| 2207 | } |
| 2208 | if (prev) |
| 2209 | ieee80211_invoke_rx_handlers(prev, &rx, skb); |
| 2210 | else |
| 2211 | dev_kfree_skb(skb); |
| 2212 | } |
| 2213 | |
| 2214 | #define SEQ_MODULO 0x1000 |
| 2215 | #define SEQ_MASK 0xfff |
| 2216 | |
| 2217 | static inline int seq_less(u16 sq1, u16 sq2) |
| 2218 | { |
| 2219 | return ((sq1 - sq2) & SEQ_MASK) > (SEQ_MODULO >> 1); |
| 2220 | } |
| 2221 | |
| 2222 | static inline u16 seq_inc(u16 sq) |
| 2223 | { |
| 2224 | return (sq + 1) & SEQ_MASK; |
| 2225 | } |
| 2226 | |
| 2227 | static inline u16 seq_sub(u16 sq1, u16 sq2) |
| 2228 | { |
| 2229 | return (sq1 - sq2) & SEQ_MASK; |
| 2230 | } |
| 2231 | |
| 2232 | |
| 2233 | static void ieee80211_release_reorder_frame(struct ieee80211_hw *hw, |
| 2234 | struct tid_ampdu_rx *tid_agg_rx, |
| 2235 | int index) |
| 2236 | { |
| 2237 | struct ieee80211_supported_band *sband; |
| 2238 | struct ieee80211_rate *rate; |
| 2239 | struct sk_buff *skb = tid_agg_rx->reorder_buf[index]; |
| 2240 | struct ieee80211_rx_status *status; |
| 2241 | |
| 2242 | if (!skb) |
| 2243 | goto no_frame; |
| 2244 | |
| 2245 | status = IEEE80211_SKB_RXCB(skb); |
| 2246 | |
| 2247 | /* release the reordered frames to stack */ |
| 2248 | sband = hw->wiphy->bands[status->band]; |
| 2249 | if (status->flag & RX_FLAG_HT) |
| 2250 | rate = sband->bitrates; /* TODO: HT rates */ |
| 2251 | else |
| 2252 | rate = &sband->bitrates[status->rate_idx]; |
| 2253 | __ieee80211_rx_handle_packet(hw, skb, rate); |
| 2254 | tid_agg_rx->stored_mpdu_num--; |
| 2255 | tid_agg_rx->reorder_buf[index] = NULL; |
| 2256 | |
| 2257 | no_frame: |
| 2258 | tid_agg_rx->head_seq_num = seq_inc(tid_agg_rx->head_seq_num); |
| 2259 | } |
| 2260 | |
| 2261 | |
| 2262 | /* |
| 2263 | * Timeout (in jiffies) for skb's that are waiting in the RX reorder buffer. If |
| 2264 | * the skb was added to the buffer longer than this time ago, the earlier |
| 2265 | * frames that have not yet been received are assumed to be lost and the skb |
| 2266 | * can be released for processing. This may also release other skb's from the |
| 2267 | * reorder buffer if there are no additional gaps between the frames. |
| 2268 | */ |
| 2269 | #define HT_RX_REORDER_BUF_TIMEOUT (HZ / 10) |
| 2270 | |
| 2271 | /* |
| 2272 | * As it function blongs to Rx path it must be called with |
| 2273 | * the proper rcu_read_lock protection for its flow. |
| 2274 | */ |
| 2275 | static u8 ieee80211_sta_manage_reorder_buf(struct ieee80211_hw *hw, |
| 2276 | struct tid_ampdu_rx *tid_agg_rx, |
| 2277 | struct sk_buff *skb, |
| 2278 | u16 mpdu_seq_num, |
| 2279 | int bar_req) |
| 2280 | { |
| 2281 | u16 head_seq_num, buf_size; |
| 2282 | int index; |
| 2283 | |
| 2284 | buf_size = tid_agg_rx->buf_size; |
| 2285 | head_seq_num = tid_agg_rx->head_seq_num; |
| 2286 | |
| 2287 | /* frame with out of date sequence number */ |
| 2288 | if (seq_less(mpdu_seq_num, head_seq_num)) { |
| 2289 | dev_kfree_skb(skb); |
| 2290 | return 1; |
| 2291 | } |
| 2292 | |
| 2293 | /* if frame sequence number exceeds our buffering window size or |
| 2294 | * block Ack Request arrived - release stored frames */ |
| 2295 | if ((!seq_less(mpdu_seq_num, head_seq_num + buf_size)) || (bar_req)) { |
| 2296 | /* new head to the ordering buffer */ |
| 2297 | if (bar_req) |
| 2298 | head_seq_num = mpdu_seq_num; |
| 2299 | else |
| 2300 | head_seq_num = |
| 2301 | seq_inc(seq_sub(mpdu_seq_num, buf_size)); |
| 2302 | /* release stored frames up to new head to stack */ |
| 2303 | while (seq_less(tid_agg_rx->head_seq_num, head_seq_num)) { |
| 2304 | index = seq_sub(tid_agg_rx->head_seq_num, |
| 2305 | tid_agg_rx->ssn) |
| 2306 | % tid_agg_rx->buf_size; |
| 2307 | ieee80211_release_reorder_frame(hw, tid_agg_rx, |
| 2308 | index); |
| 2309 | } |
| 2310 | if (bar_req) |
| 2311 | return 1; |
| 2312 | } |
| 2313 | |
| 2314 | /* now the new frame is always in the range of the reordering */ |
| 2315 | /* buffer window */ |
| 2316 | index = seq_sub(mpdu_seq_num, tid_agg_rx->ssn) |
| 2317 | % tid_agg_rx->buf_size; |
| 2318 | /* check if we already stored this frame */ |
| 2319 | if (tid_agg_rx->reorder_buf[index]) { |
| 2320 | dev_kfree_skb(skb); |
| 2321 | return 1; |
| 2322 | } |
| 2323 | |
| 2324 | /* if arrived mpdu is in the right order and nothing else stored */ |
| 2325 | /* release it immediately */ |
| 2326 | if (mpdu_seq_num == tid_agg_rx->head_seq_num && |
| 2327 | tid_agg_rx->stored_mpdu_num == 0) { |
| 2328 | tid_agg_rx->head_seq_num = |
| 2329 | seq_inc(tid_agg_rx->head_seq_num); |
| 2330 | return 0; |
| 2331 | } |
| 2332 | |
| 2333 | /* put the frame in the reordering buffer */ |
| 2334 | tid_agg_rx->reorder_buf[index] = skb; |
| 2335 | tid_agg_rx->reorder_time[index] = jiffies; |
| 2336 | tid_agg_rx->stored_mpdu_num++; |
| 2337 | /* release the buffer until next missing frame */ |
| 2338 | index = seq_sub(tid_agg_rx->head_seq_num, tid_agg_rx->ssn) |
| 2339 | % tid_agg_rx->buf_size; |
| 2340 | if (!tid_agg_rx->reorder_buf[index] && |
| 2341 | tid_agg_rx->stored_mpdu_num > 1) { |
| 2342 | /* |
| 2343 | * No buffers ready to be released, but check whether any |
| 2344 | * frames in the reorder buffer have timed out. |
| 2345 | */ |
| 2346 | int j; |
| 2347 | int skipped = 1; |
| 2348 | for (j = (index + 1) % tid_agg_rx->buf_size; j != index; |
| 2349 | j = (j + 1) % tid_agg_rx->buf_size) { |
| 2350 | if (tid_agg_rx->reorder_buf[j] == NULL) { |
| 2351 | skipped++; |
| 2352 | continue; |
| 2353 | } |
| 2354 | if (!time_after(jiffies, tid_agg_rx->reorder_time[j] + |
| 2355 | HZ / 10)) |
| 2356 | break; |
| 2357 | |
| 2358 | #ifdef CONFIG_MAC80211_HT_DEBUG |
| 2359 | if (net_ratelimit()) |
| 2360 | printk(KERN_DEBUG "%s: release an RX reorder " |
| 2361 | "frame due to timeout on earlier " |
| 2362 | "frames\n", |
| 2363 | wiphy_name(hw->wiphy)); |
| 2364 | #endif |
| 2365 | ieee80211_release_reorder_frame(hw, tid_agg_rx, j); |
| 2366 | |
| 2367 | /* |
| 2368 | * Increment the head seq# also for the skipped slots. |
| 2369 | */ |
| 2370 | tid_agg_rx->head_seq_num = |
| 2371 | (tid_agg_rx->head_seq_num + skipped) & |
| 2372 | SEQ_MASK; |
| 2373 | skipped = 0; |
| 2374 | } |
| 2375 | } else while (tid_agg_rx->reorder_buf[index]) { |
| 2376 | ieee80211_release_reorder_frame(hw, tid_agg_rx, index); |
| 2377 | index = seq_sub(tid_agg_rx->head_seq_num, |
| 2378 | tid_agg_rx->ssn) % tid_agg_rx->buf_size; |
| 2379 | } |
| 2380 | return 1; |
| 2381 | } |
| 2382 | |
| 2383 | static u8 ieee80211_rx_reorder_ampdu(struct ieee80211_local *local, |
| 2384 | struct sk_buff *skb) |
| 2385 | { |
| 2386 | struct ieee80211_hw *hw = &local->hw; |
| 2387 | struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data; |
| 2388 | struct sta_info *sta; |
| 2389 | struct tid_ampdu_rx *tid_agg_rx; |
| 2390 | u16 sc; |
| 2391 | u16 mpdu_seq_num; |
| 2392 | u8 ret = 0; |
| 2393 | int tid; |
| 2394 | |
| 2395 | sta = sta_info_get(local, hdr->addr2); |
| 2396 | if (!sta) |
| 2397 | return ret; |
| 2398 | |
| 2399 | /* filter the QoS data rx stream according to |
| 2400 | * STA/TID and check if this STA/TID is on aggregation */ |
| 2401 | if (!ieee80211_is_data_qos(hdr->frame_control)) |
| 2402 | goto end_reorder; |
| 2403 | |
| 2404 | tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK; |
| 2405 | |
| 2406 | if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_OPERATIONAL) |
| 2407 | goto end_reorder; |
| 2408 | |
| 2409 | tid_agg_rx = sta->ampdu_mlme.tid_rx[tid]; |
| 2410 | |
| 2411 | /* qos null data frames are excluded */ |
| 2412 | if (unlikely(hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_NULLFUNC))) |
| 2413 | goto end_reorder; |
| 2414 | |
| 2415 | /* new un-ordered ampdu frame - process it */ |
| 2416 | |
| 2417 | /* reset session timer */ |
| 2418 | if (tid_agg_rx->timeout) |
| 2419 | mod_timer(&tid_agg_rx->session_timer, |
| 2420 | TU_TO_EXP_TIME(tid_agg_rx->timeout)); |
| 2421 | |
| 2422 | /* if this mpdu is fragmented - terminate rx aggregation session */ |
| 2423 | sc = le16_to_cpu(hdr->seq_ctrl); |
| 2424 | if (sc & IEEE80211_SCTL_FRAG) { |
| 2425 | ieee80211_sta_stop_rx_ba_session(sta->sdata, sta->sta.addr, |
| 2426 | tid, 0, WLAN_REASON_QSTA_REQUIRE_SETUP); |
| 2427 | ret = 1; |
| 2428 | goto end_reorder; |
| 2429 | } |
| 2430 | |
| 2431 | /* according to mpdu sequence number deal with reordering buffer */ |
| 2432 | mpdu_seq_num = (sc & IEEE80211_SCTL_SEQ) >> 4; |
| 2433 | ret = ieee80211_sta_manage_reorder_buf(hw, tid_agg_rx, skb, |
| 2434 | mpdu_seq_num, 0); |
| 2435 | end_reorder: |
| 2436 | return ret; |
| 2437 | } |
| 2438 | |
| 2439 | /* |
| 2440 | * This is the receive path handler. It is called by a low level driver when an |
| 2441 | * 802.11 MPDU is received from the hardware. |
| 2442 | */ |
| 2443 | void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb) |
| 2444 | { |
| 2445 | struct ieee80211_local *local = hw_to_local(hw); |
| 2446 | struct ieee80211_rate *rate = NULL; |
| 2447 | struct ieee80211_supported_band *sband; |
| 2448 | struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb); |
| 2449 | |
| 2450 | if (status->band < 0 || |
| 2451 | status->band >= IEEE80211_NUM_BANDS) { |
| 2452 | WARN_ON(1); |
| 2453 | return; |
| 2454 | } |
| 2455 | |
| 2456 | sband = local->hw.wiphy->bands[status->band]; |
| 2457 | if (!sband) { |
| 2458 | WARN_ON(1); |
| 2459 | return; |
| 2460 | } |
| 2461 | |
| 2462 | /* |
| 2463 | * If we're suspending, it is possible although not too likely |
| 2464 | * that we'd be receiving frames after having already partially |
| 2465 | * quiesced the stack. We can't process such frames then since |
| 2466 | * that might, for example, cause stations to be added or other |
| 2467 | * driver callbacks be invoked. |
| 2468 | */ |
| 2469 | if (unlikely(local->quiescing || local->suspended)) { |
| 2470 | kfree_skb(skb); |
| 2471 | return; |
| 2472 | } |
| 2473 | |
| 2474 | if (status->flag & RX_FLAG_HT) { |
| 2475 | /* rate_idx is MCS index */ |
| 2476 | if (WARN_ON(status->rate_idx < 0 || |
| 2477 | status->rate_idx >= 76)) |
| 2478 | return; |
| 2479 | /* HT rates are not in the table - use the highest legacy rate |
| 2480 | * for now since other parts of mac80211 may not yet be fully |
| 2481 | * MCS aware. */ |
| 2482 | rate = &sband->bitrates[sband->n_bitrates - 1]; |
| 2483 | } else { |
| 2484 | if (WARN_ON(status->rate_idx < 0 || |
| 2485 | status->rate_idx >= sband->n_bitrates)) |
| 2486 | return; |
| 2487 | rate = &sband->bitrates[status->rate_idx]; |
| 2488 | } |
| 2489 | |
| 2490 | /* |
| 2491 | * key references and virtual interfaces are protected using RCU |
| 2492 | * and this requires that we are in a read-side RCU section during |
| 2493 | * receive processing |
| 2494 | */ |
| 2495 | rcu_read_lock(); |
| 2496 | |
| 2497 | /* |
| 2498 | * Frames with failed FCS/PLCP checksum are not returned, |
| 2499 | * all other frames are returned without radiotap header |
| 2500 | * if it was previously present. |
| 2501 | * Also, frames with less than 16 bytes are dropped. |
| 2502 | */ |
| 2503 | skb = ieee80211_rx_monitor(local, skb, rate); |
| 2504 | if (!skb) { |
| 2505 | rcu_read_unlock(); |
| 2506 | return; |
| 2507 | } |
| 2508 | |
| 2509 | /* |
| 2510 | * In theory, the block ack reordering should happen after duplicate |
| 2511 | * removal (ieee80211_rx_h_check(), which is an RX handler). As such, |
| 2512 | * the call to ieee80211_rx_reorder_ampdu() should really be moved to |
| 2513 | * happen as a new RX handler between ieee80211_rx_h_check and |
| 2514 | * ieee80211_rx_h_decrypt. This cleanup may eventually happen, but for |
| 2515 | * the time being, the call can be here since RX reorder buf processing |
| 2516 | * will implicitly skip duplicates. We could, in theory at least, |
| 2517 | * process frames that ieee80211_rx_h_passive_scan would drop (e.g., |
| 2518 | * frames from other than operational channel), but that should not |
| 2519 | * happen in normal networks. |
| 2520 | */ |
| 2521 | if (!ieee80211_rx_reorder_ampdu(local, skb)) |
| 2522 | __ieee80211_rx_handle_packet(hw, skb, rate); |
| 2523 | |
| 2524 | rcu_read_unlock(); |
| 2525 | } |
| 2526 | EXPORT_SYMBOL(__ieee80211_rx); |
| 2527 | |
| 2528 | /* This is a version of the rx handler that can be called from hard irq |
| 2529 | * context. Post the skb on the queue and schedule the tasklet */ |
| 2530 | void ieee80211_rx_irqsafe(struct ieee80211_hw *hw, struct sk_buff *skb) |
| 2531 | { |
| 2532 | struct ieee80211_local *local = hw_to_local(hw); |
| 2533 | |
| 2534 | BUILD_BUG_ON(sizeof(struct ieee80211_rx_status) > sizeof(skb->cb)); |
| 2535 | |
| 2536 | skb->pkt_type = IEEE80211_RX_MSG; |
| 2537 | skb_queue_tail(&local->skb_queue, skb); |
| 2538 | tasklet_schedule(&local->tasklet); |
| 2539 | } |
| 2540 | EXPORT_SYMBOL(ieee80211_rx_irqsafe); |