sys/netproto/802_11/wlan/ieee80211_wds.c

   1 /*-
   2  * Copyright (c) 2007-2008 Sam Leffler, Errno Consulting
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifdef __FreeBSD__
  28 __FBSDID("$FreeBSD$");
  29 #endif
  30
  31 /*
  32  * IEEE 802.11 WDS mode support.
  33  */
  34 #include "opt_inet.h"
  35 #include "opt_wlan.h"
  36
  37 #include <sys/param.h>
  38 #include <sys/systm.h>
  39 #include <sys/mbuf.h>
  40 #include <sys/malloc.h>
  41 #include <sys/kernel.h>
  42
  43 #include <sys/socket.h>
  44 #include <sys/sockio.h>
  45 #include <sys/endian.h>
  46 #include <sys/errno.h>
  47 #include <sys/proc.h>
  48 #include <sys/sysctl.h>
  49
  50 #include <net/if.h>
  51 #include <net/if_var.h>
  52 #include <net/if_media.h>
  53 #include <net/if_llc.h>
  54 #include <net/ethernet.h>
  55
  56 #include <net/bpf.h>
  57
  58 #include <netproto/802_11/ieee80211_var.h>
  59 #include <netproto/802_11/ieee80211_wds.h>
  60 #include <netproto/802_11/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <netproto/802_11/ieee80211_superg.h>
  63 #endif
  64
  65 static void wds_vattach(struct ieee80211vap *);
  66 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  67 static int wds_input(struct ieee80211_node *ni, struct mbuf *m,
  68             const struct ieee80211_rx_stats *rxs, int, int);
  69 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *, int subtype,
  70         const struct ieee80211_rx_stats *, int, int);
  71
  72 void
  73 ieee80211_wds_attach(struct ieee80211com *ic)
  74 {
  75         ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
  76 }
  77
  78 void
  79 ieee80211_wds_detach(struct ieee80211com *ic)
  80 {
  81 }
  82
  83 static void
  84 wds_vdetach(struct ieee80211vap *vap)
  85 {
  86         if (vap->iv_bss != NULL) {
  87                 /* XXX locking? */
  88                 if (vap->iv_bss->ni_wdsvap == vap)
  89                         vap->iv_bss->ni_wdsvap = NULL;
  90         }
  91 }
  92
  93 static void
  94 wds_vattach(struct ieee80211vap *vap)
  95 {
  96         vap->iv_newstate = wds_newstate;
  97         vap->iv_input = wds_input;
  98         vap->iv_recv_mgmt = wds_recv_mgmt;
  99         vap->iv_opdetach = wds_vdetach;
 100 }
 101
 102 static void
 103 wds_flush(struct ieee80211_node *ni)
 104 {
 105         struct ieee80211com *ic = ni->ni_ic;
 106         struct mbuf *m, *next;
 107         int8_t rssi, nf;
 108
 109         m = ieee80211_ageq_remove(&ic->ic_stageq,
 110             (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
 111         if (m == NULL)
 112                 return;
 113
 114         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
 115             "%s", "flush wds queue");
 116         ic->ic_node_getsignal(ni, &rssi, &nf);
 117         for (; m != NULL; m = next) {
 118                 next = m->m_nextpkt;
 119                 m->m_nextpkt = NULL;
 120                 ieee80211_input(ni, m, rssi, nf);
 121         }
 122 }
 123
 124 static int
 125 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
 126 {
 127         struct ieee80211com *ic = vap->iv_ic;
 128         struct ieee80211_node_table *nt = &ic->ic_sta;
 129         struct ieee80211_node *ni, *obss;
 130
 131         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 132              "%s: creating link to %s on channel %u\n", __func__,
 133              ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
 134
 135         /* NB: vap create must specify the bssid for the link */
 136         KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
 137         /* NB: we should only be called on RUN transition */
 138         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
 139
 140         if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
 141                 /*
 142                  * Dynamic/non-legacy WDS.  Reference the associated
 143                  * station specified by the desired bssid setup at vap
 144                  * create.  Point ni_wdsvap at the WDS vap so 4-address
 145                  * frames received through the associated AP vap will
 146                  * be dispatched upward (e.g. to a bridge) as though
 147                  * they arrived on the WDS vap.
 148                  */
 149                 IEEE80211_NODE_LOCK(nt);
 150                 obss = NULL;
 151                 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
 152                 if (ni == NULL) {
 153                         /*
 154                          * Node went away before we could hookup.  This
 155                          * should be ok; no traffic will flow and a leave
 156                          * event will be dispatched that should cause
 157                          * the vap to be destroyed.
 158                          */
 159                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 160                             "%s: station %s went away\n",
 161                             __func__, ether_sprintf(vap->iv_des_bssid));
 162                         /* XXX stat? */
 163                 } else if (ni->ni_wdsvap != NULL) {
 164                         /*
 165                          * Node already setup with a WDS vap; we cannot
 166                          * allow multiple references so disallow.  If
 167                          * ni_wdsvap points at us that's ok; we should
 168                          * do nothing anyway.
 169                          */
 170                         /* XXX printf instead? */
 171                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 172                             "%s: station %s in use with %s\n",
 173                             __func__, ether_sprintf(vap->iv_des_bssid),
 174                             ni->ni_wdsvap->iv_ifp->if_xname);
 175                         /* XXX stat? */
 176                 } else {
 177                         /*
 178                          * Committed to new node, setup state.
 179                          */
 180                         obss = vap->iv_bss;
 181                         vap->iv_bss = ni;
 182                         ni->ni_wdsvap = vap;
 183                 }
 184                 IEEE80211_NODE_UNLOCK(nt);
 185                 if (obss != NULL) {
 186                         /* NB: deferred to avoid recursive lock */
 187                         ieee80211_free_node(obss);
 188                 }
 189         } else {
 190                 /*
 191                  * Legacy WDS vap setup.
 192                  */
 193                 /*
 194                  * The far end does not associate so we just create
 195                  * create a new node and install it as the vap's
 196                  * bss node.  We must simulate an association and
 197                  * authorize the port for traffic to flow.
 198                  * XXX check if node already in sta table?
 199                  */
 200                 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
 201                 if (ni != NULL) {
 202                         obss = vap->iv_bss;
 203                         vap->iv_bss = ieee80211_ref_node(ni);
 204                         ni->ni_flags |= IEEE80211_NODE_AREF;
 205                         if (obss != NULL)
 206                                 ieee80211_free_node(obss);
 207                         /* give driver a chance to setup state like ni_txrate */
 208                         if (ic->ic_newassoc != NULL)
 209                                 ic->ic_newassoc(ni, 1);
 210                         /* tell the authenticator about new station */
 211                         if (vap->iv_auth->ia_node_join != NULL)
 212                                 vap->iv_auth->ia_node_join(ni);
 213                         if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 214                                 ieee80211_node_authorize(ni);
 215
 216                         ieee80211_notify_node_join(ni, 1 /*newassoc*/);
 217                         /* XXX inject l2uf frame */
 218                 }
 219         }
 220
 221         /*
 222          * Flush any pending frames now that were setup.
 223          */
 224         if (ni != NULL)
 225                 wds_flush(ni);
 226         return (ni == NULL ? ENOENT : 0);
 227 }
 228
 229 /*
 230  * Propagate multicast frames of an ap vap to all DWDS links.
 231  * The caller is assumed to have verified this frame is multicast.
 232  */
 233 void
 234 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
 235 {
 236         struct ieee80211com *ic = vap0->iv_ic;
 237         const struct ether_header *eh = mtod(m, const struct ether_header *);
 238         struct ieee80211_node *ni;
 239         struct ieee80211vap *vap;
 240         struct ifnet *ifp;
 241         struct mbuf *mcopy;
 242         int err;
 243
 244         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
 245             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
 246
 247         /* XXX locking */
 248         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 249                 /* only DWDS vaps are interesting */
 250                 if (vap->iv_opmode != IEEE80211_M_WDS ||
 251                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
 252                         continue;
 253                 /* if it came in this interface, don't send it back out */
 254                 ifp = vap->iv_ifp;
 255                 if (ifp == m->m_pkthdr.rcvif)
 256                         continue;
 257                 /*
 258                  * Duplicate the frame and send it.
 259                  */
 260                 mcopy = m_copypacket(m, M_NOWAIT);
 261                 if (mcopy == NULL) {
 262                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 263                         /* XXX stat + msg */
 264                         continue;
 265                 }
 266                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
 267                 if (ni == NULL) {
 268                         /* NB: ieee80211_find_txnode does stat+msg */
 269                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 270                         m_freem(mcopy);
 271                         continue;
 272                 }
 273                 /* calculate priority so drivers can find the tx queue */
 274                 if (ieee80211_classify(ni, mcopy)) {
 275                         IEEE80211_DISCARD_MAC(vap,
 276                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
 277                             eh->ether_dhost, NULL,
 278                             "%s", "classification failure");
 279                         vap->iv_stats.is_tx_classify++;
 280                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 281                         m_freem(mcopy);
 282                         ieee80211_free_node(ni);
 283                         continue;
 284                 }
 285
 286                 BPF_MTAP(ifp, m);               /* 802.3 tx */
 287
 288                 /*
 289                  * Encapsulate the packet in prep for transmission.
 290                  */
 291                 IEEE80211_TX_LOCK(ic);
 292                 mcopy = ieee80211_encap(vap, ni, mcopy);
 293                 if (mcopy == NULL) {
 294                         /* NB: stat+msg handled in ieee80211_encap */
 295                         IEEE80211_TX_UNLOCK(ic);
 296                         ieee80211_free_node(ni);
 297                         continue;
 298                 }
 299                 mcopy->m_flags |= M_MCAST;
 300                 mcopy->m_pkthdr.rcvif = (void *) ni;
 301
 302                 err = ieee80211_parent_xmitpkt(ic, mcopy);
 303                 IEEE80211_TX_UNLOCK(ic);
 304                 if (!err) {
 305                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 306                         if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
 307                         if_inc_counter(ifp, IFCOUNTER_OBYTES,
 308                                 m->m_pkthdr.len);
 309                 }
 310         }
 311 }
 312
 313 /*
 314  * Handle DWDS discovery on receipt of a 4-address frame in
 315  * ap mode.  Queue the frame and post an event for someone
 316  * to plumb the necessary WDS vap for this station.  Frames
 317  * received prior to the vap set running will then be reprocessed
 318  * as if they were just received.
 319  */
 320 void
 321 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
 322 {
 323         struct ieee80211com *ic = ni->ni_ic;
 324
 325         /*
 326          * Save the frame with an aging interval 4 times
 327          * the listen interval specified by the station.
 328          * Frames that sit around too long are reclaimed
 329          * using this information.
 330          * XXX handle overflow?
 331          * XXX per/vap beacon interval?
 332          */
 333         m->m_pkthdr.rcvif = (void *)(uintptr_t)
 334             ieee80211_mac_hash(ic, ni->ni_macaddr);
 335         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
 336             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
 337         ieee80211_notify_wds_discover(ni);
 338 }
 339
 340 /*
 341  * IEEE80211_M_WDS vap state machine handler.
 342  */
 343 static int
 344 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 345 {
 346         struct ieee80211com *ic = vap->iv_ic;
 347         struct ieee80211_node *ni;
 348         enum ieee80211_state ostate;
 349         int error;
 350
 351         IEEE80211_LOCK_ASSERT(ic);
 352
 353         ostate = vap->iv_state;
 354         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
 355                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 356         vap->iv_state = nstate;                 /* state transition */
 357         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 358         if (ostate != IEEE80211_S_SCAN)
 359                 ieee80211_cancel_scan(vap);     /* background scan */
 360         ni = vap->iv_bss;                       /* NB: no reference held */
 361         error = 0;
 362         switch (nstate) {
 363         case IEEE80211_S_INIT:
 364                 switch (ostate) {
 365                 case IEEE80211_S_SCAN:
 366                         ieee80211_cancel_scan(vap);
 367                         break;
 368                 default:
 369                         break;
 370                 }
 371                 if (ostate != IEEE80211_S_INIT) {
 372                         /* NB: optimize INIT -> INIT case */
 373                         ieee80211_reset_bss(vap);
 374                 }
 375                 break;
 376         case IEEE80211_S_SCAN:
 377                 switch (ostate) {
 378                 case IEEE80211_S_INIT:
 379                         ieee80211_check_scan_current(vap);
 380                         break;
 381                 default:
 382                         break;
 383                 }
 384                 break;
 385         case IEEE80211_S_RUN:
 386                 if (ostate == IEEE80211_S_INIT) {
 387                         /*
 388                          * Already have a channel; bypass the scan
 389                          * and startup immediately.
 390                          */
 391                         error = ieee80211_create_wds(vap, ic->ic_curchan);
 392                 }
 393                 break;
 394         default:
 395                 break;
 396         }
 397         return error;
 398 }
 399
 400 /*
 401  * Process a received frame.  The node associated with the sender
 402  * should be supplied.  If nothing was found in the node table then
 403  * the caller is assumed to supply a reference to iv_bss instead.
 404  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 405  * during AP scanning to select a AP to associate with; it can have
 406  * any units so long as values have consistent units and higher values
 407  * mean ``better signal''.  The receive timestamp is currently not used
 408  * by the 802.11 layer.
 409  */
 410 static int
 411 wds_input(struct ieee80211_node *ni, struct mbuf *m,
 412     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 413 {
 414         struct ieee80211vap *vap = ni->ni_vap;
 415         struct ieee80211com *ic = ni->ni_ic;
 416         struct ifnet *ifp = vap->iv_ifp;
 417         struct ieee80211_frame *wh;
 418         struct ieee80211_key *key;
 419         struct ether_header *eh;
 420         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 421         uint8_t dir, type, subtype, qos;
 422
 423         if (m->m_flags & M_AMPDU_MPDU) {
 424                 /*
 425                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 426                  * w/ M_AMPDU_MPDU marked have already passed through
 427                  * here but were received out of order and been held on
 428                  * the reorder queue.  When resubmitted they are marked
 429                  * with the M_AMPDU_MPDU flag and we can bypass most of
 430                  * the normal processing.
 431                  */
 432                 wh = mtod(m, struct ieee80211_frame *);
 433                 type = IEEE80211_FC0_TYPE_DATA;
 434                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 435                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 436                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 437                 goto resubmit_ampdu;
 438         }
 439
 440         KASSERT(ni != NULL, ("null node"));
 441
 442         type = -1;                      /* undefined */
 443
 444         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 445                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 446                     ni->ni_macaddr, NULL,
 447                     "too short (1): len %u", m->m_pkthdr.len);
 448                 vap->iv_stats.is_rx_tooshort++;
 449                 goto out;
 450         }
 451         /*
 452          * Bit of a cheat here, we use a pointer for a 3-address
 453          * frame format but don't reference fields past outside
 454          * ieee80211_frame_min w/o first validating the data is
 455          * present.
 456          */
 457         wh = mtod(m, struct ieee80211_frame *);
 458
 459         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 460                 ni->ni_inact = ni->ni_inact_reload;
 461
 462         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 463             IEEE80211_FC0_VERSION_0) {
 464                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 465                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 466                     wh->i_fc[0], wh->i_fc[1]);
 467                 vap->iv_stats.is_rx_badversion++;
 468                 goto err;
 469         }
 470
 471         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 472         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 473         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 474
 475         /* NB: WDS vap's do not scan */
 476         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
 477                 IEEE80211_DISCARD_MAC(vap,
 478                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
 479                     "too short (3): len %u", m->m_pkthdr.len);
 480                 vap->iv_stats.is_rx_tooshort++;
 481                 goto out;
 482         }
 483         /* NB: the TA is implicitly verified by finding the wds peer node */
 484         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
 485             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
 486                 /* not interested in */
 487                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 488                     wh->i_addr1, NULL, "%s", "not to bss");
 489                 vap->iv_stats.is_rx_wrongbss++;
 490                 goto out;
 491         }
 492         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 493         ni->ni_noise = nf;
 494         if (IEEE80211_HAS_SEQ(type, subtype)) {
 495                 uint8_t tid = ieee80211_gettid(wh);
 496                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
 497                     TID_TO_WME_AC(tid) >= WME_AC_VI)
 498                         ic->ic_wme.wme_hipri_traffic++;
 499                 if (! ieee80211_check_rxseq(ni, wh, wh->i_addr1))
 500                         goto out;
 501         }
 502         switch (type) {
 503         case IEEE80211_FC0_TYPE_DATA:
 504                 hdrspace = ieee80211_hdrspace(ic, wh);
 505                 if (m->m_len < hdrspace &&
 506                     (m = m_pullup(m, hdrspace)) == NULL) {
 507                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 508                             ni->ni_macaddr, NULL,
 509                             "data too short: expecting %u", hdrspace);
 510                         vap->iv_stats.is_rx_tooshort++;
 511                         goto out;               /* XXX */
 512                 }
 513                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
 514                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 515                             wh, "data", "incorrect dir 0x%x", dir);
 516                         vap->iv_stats.is_rx_wrongdir++;
 517                         goto out;
 518                 }
 519                 /*
 520                  * Only legacy WDS traffic should take this path.
 521                  */
 522                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
 523                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 524                             wh, "data", "%s", "not legacy wds");
 525                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
 526                         goto out;
 527                 }
 528                 /*
 529                  * Handle A-MPDU re-ordering.  If the frame is to be
 530                  * processed directly then ieee80211_ampdu_reorder
 531                  * will return 0; otherwise it has consumed the mbuf
 532                  * and we should do nothing more with it.
 533                  */
 534                 if ((m->m_flags & M_AMPDU) &&
 535                     ieee80211_ampdu_reorder(ni, m) != 0) {
 536                         m = NULL;
 537                         goto out;
 538                 }
 539         resubmit_ampdu:
 540
 541                 /*
 542                  * Handle privacy requirements.  Note that we
 543                  * must not be preempted from here until after
 544                  * we (potentially) call ieee80211_crypto_demic;
 545                  * otherwise we may violate assumptions in the
 546                  * crypto cipher modules used to do delayed update
 547                  * of replay sequence numbers.
 548                  */
 549                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 550                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 551                                 /*
 552                                  * Discard encrypted frames when privacy is off.
 553                                  */
 554                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 555                                     wh, "WEP", "%s", "PRIVACY off");
 556                                 vap->iv_stats.is_rx_noprivacy++;
 557                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 558                                 goto out;
 559                         }
 560                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 561                         if (key == NULL) {
 562                                 /* NB: stats+msgs handled in crypto_decap */
 563                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 564                                 goto out;
 565                         }
 566                         wh = mtod(m, struct ieee80211_frame *);
 567                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 568                 } else {
 569                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 570                         key = NULL;
 571                 }
 572
 573                 /*
 574                  * Save QoS bits for use below--before we strip the header.
 575                  */
 576                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 577                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 578                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 579                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 580                 } else
 581                         qos = 0;
 582
 583                 /*
 584                  * Next up, any fragmentation.
 585                  */
 586                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 587                         m = ieee80211_defrag(ni, m, hdrspace);
 588                         if (m == NULL) {
 589                                 /* Fragment dropped or frame not complete yet */
 590                                 goto out;
 591                         }
 592                 }
 593                 wh = NULL;              /* no longer valid, catch any uses */
 594
 595                 /*
 596                  * Next strip any MSDU crypto bits.
 597                  */
 598                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 599                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 600                             ni->ni_macaddr, "data", "%s", "demic error");
 601                         vap->iv_stats.is_rx_demicfail++;
 602                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 603                         goto out;
 604                 }
 605
 606                 /* copy to listener after decrypt */
 607                 if (ieee80211_radiotap_active_vap(vap))
 608                         ieee80211_radiotap_rx(vap, m);
 609                 need_tap = 0;
 610
 611                 /*
 612                  * Finally, strip the 802.11 header.
 613                  */
 614                 m = ieee80211_decap(vap, m, hdrspace);
 615                 if (m == NULL) {
 616                         /* XXX mask bit to check for both */
 617                         /* don't count Null data frames as errors */
 618                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 619                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 620                                 goto out;
 621                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 622                             ni->ni_macaddr, "data", "%s", "decap error");
 623                         vap->iv_stats.is_rx_decap++;
 624                         IEEE80211_NODE_STAT(ni, rx_decap);
 625                         goto err;
 626                 }
 627                 eh = mtod(m, struct ether_header *);
 628                 if (!ieee80211_node_is_authorized(ni)) {
 629                         /*
 630                          * Deny any non-PAE frames received prior to
 631                          * authorization.  For open/shared-key
 632                          * authentication the port is mark authorized
 633                          * after authentication completes.  For 802.1x
 634                          * the port is not marked authorized by the
 635                          * authenticator until the handshake has completed.
 636                          */
 637                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 638                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 639                                     eh->ether_shost, "data",
 640                                     "unauthorized port: ether type 0x%x len %u",
 641                                     eh->ether_type, m->m_pkthdr.len);
 642                                 vap->iv_stats.is_rx_unauth++;
 643                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 644                                 goto err;
 645                         }
 646                 } else {
 647                         /*
 648                          * When denying unencrypted frames, discard
 649                          * any non-PAE frames received without encryption.
 650                          */
 651                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 652                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 653                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 654                                 /*
 655                                  * Drop unencrypted frames.
 656                                  */
 657                                 vap->iv_stats.is_rx_unencrypted++;
 658                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 659                                 goto out;
 660                         }
 661                 }
 662                 /* XXX require HT? */
 663                 if (qos & IEEE80211_QOS_AMSDU) {
 664                         m = ieee80211_decap_amsdu(ni, m);
 665                         if (m == NULL)
 666                                 return IEEE80211_FC0_TYPE_DATA;
 667                 } else {
 668 #ifdef IEEE80211_SUPPORT_SUPERG
 669                         m = ieee80211_decap_fastframe(vap, ni, m);
 670                         if (m == NULL)
 671                                 return IEEE80211_FC0_TYPE_DATA;
 672 #endif
 673                 }
 674                 ieee80211_deliver_data(vap, ni, m);
 675                 return IEEE80211_FC0_TYPE_DATA;
 676
 677         case IEEE80211_FC0_TYPE_MGT:
 678                 vap->iv_stats.is_rx_mgmt++;
 679                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 680                 if (dir != IEEE80211_FC1_DIR_NODS) {
 681                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 682                             wh, "data", "incorrect dir 0x%x", dir);
 683                         vap->iv_stats.is_rx_wrongdir++;
 684                         goto err;
 685                 }
 686                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 687                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 688                             ni->ni_macaddr, "mgt", "too short: len %u",
 689                             m->m_pkthdr.len);
 690                         vap->iv_stats.is_rx_tooshort++;
 691                         goto out;
 692                 }
 693 #ifdef IEEE80211_DEBUG
 694                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
 695                         if_printf(ifp, "received %s from %s rssi %d\n",
 696                             ieee80211_mgt_subtype_name(subtype),
 697                             ether_sprintf(wh->i_addr2), rssi);
 698                 }
 699 #endif
 700                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 701                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 702                             wh, NULL, "%s", "WEP set but not permitted");
 703                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 704                         goto out;
 705                 }
 706                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 707                 goto out;
 708
 709         case IEEE80211_FC0_TYPE_CTL:
 710                 vap->iv_stats.is_rx_ctl++;
 711                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 712                 goto out;
 713
 714         default:
 715                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 716                     wh, "bad", "frame type 0x%x", type);
 717                 /* should not come here */
 718                 break;
 719         }
 720 err:
 721         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 722 out:
 723         if (m != NULL) {
 724                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 725                         ieee80211_radiotap_rx(vap, m);
 726                 m_freem(m);
 727         }
 728         return type;
 729 }
 730
 731 static void
 732 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
 733     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 734 {
 735         struct ieee80211vap *vap = ni->ni_vap;
 736         struct ieee80211com *ic = ni->ni_ic;
 737         struct ieee80211_frame *wh;
 738         u_int8_t *frm, *efrm;
 739
 740         wh = mtod(m0, struct ieee80211_frame *);
 741         frm = (u_int8_t *)&wh[1];
 742         efrm = mtod(m0, u_int8_t *) + m0->m_len;
 743         switch (subtype) {
 744         case IEEE80211_FC0_SUBTYPE_ACTION:
 745         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 746                 if (ni == vap->iv_bss) {
 747                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 748                             wh, NULL, "%s", "unknown node");
 749                         vap->iv_stats.is_rx_mgtdiscard++;
 750                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
 751                         /* NB: not interested in multicast frames. */
 752                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 753                             wh, NULL, "%s", "not for us");
 754                         vap->iv_stats.is_rx_mgtdiscard++;
 755                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 756                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 757                             wh, NULL, "wrong state %s",
 758                             ieee80211_state_name[vap->iv_state]);
 759                         vap->iv_stats.is_rx_mgtdiscard++;
 760                 } else {
 761                         if (ieee80211_parse_action(ni, m0) == 0)
 762                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 763                 }
 764                 break;
 765
 766         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 767         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 768         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 769         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 770         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 771         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 772         case IEEE80211_FC0_SUBTYPE_TIMING_ADV:
 773         case IEEE80211_FC0_SUBTYPE_BEACON:
 774         case IEEE80211_FC0_SUBTYPE_ATIM:
 775         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 776         case IEEE80211_FC0_SUBTYPE_AUTH:
 777         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 778                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 779                     wh, NULL, "%s", "not handled");
 780                 vap->iv_stats.is_rx_mgtdiscard++;
 781                 break;
 782
 783         default:
 784                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 785                     wh, "mgt", "subtype 0x%x not handled", subtype);
 786                 vap->iv_stats.is_rx_badsubtype++;
 787                 break;
 788         }
 789 }