sys/net80211/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 <net80211/ieee80211_var.h>
  59 #include <net80211/ieee80211_wds.h>
  60 #include <net80211/ieee80211_input.h>
  61 #ifdef IEEE80211_SUPPORT_SUPERG
  62 #include <net80211/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                 mcopy = ieee80211_encap(vap, ni, mcopy);
 292                 if (mcopy == NULL) {
 293                         /* NB: stat+msg handled in ieee80211_encap */
 294                         ieee80211_free_node(ni);
 295                         continue;
 296                 }
 297                 mcopy->m_flags |= M_MCAST;
 298                 mcopy->m_pkthdr.rcvif = (void *) ni;
 299
 300                 err = ieee80211_parent_xmitpkt(ic, mcopy);
 301                 if (err) {
 302                         /* NB: IFQ_HANDOFF reclaims mbuf */
 303                         if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
 304                         ieee80211_free_node(ni);
 305                 } else {
 306                         if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
 307                         if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
 308                         if_inc_counter(ifp, IFCOUNTER_OBYTES,
 309                             m->m_pkthdr.len);
 310                 }
 311         }
 312 }
 313
 314 /*
 315  * Handle DWDS discovery on receipt of a 4-address frame in
 316  * ap mode.  Queue the frame and post an event for someone
 317  * to plumb the necessary WDS vap for this station.  Frames
 318  * received prior to the vap set running will then be reprocessed
 319  * as if they were just received.
 320  */
 321 void
 322 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
 323 {
 324         struct ieee80211com *ic = ni->ni_ic;
 325
 326         /*
 327          * Save the frame with an aging interval 4 times
 328          * the listen interval specified by the station.
 329          * Frames that sit around too long are reclaimed
 330          * using this information.
 331          * XXX handle overflow?
 332          * XXX per/vap beacon interval?
 333          */
 334         m->m_pkthdr.rcvif = (void *)(uintptr_t)
 335             ieee80211_mac_hash(ic, ni->ni_macaddr);
 336         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
 337             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
 338         ieee80211_notify_wds_discover(ni);
 339 }
 340
 341 /*
 342  * IEEE80211_M_WDS vap state machine handler.
 343  */
 344 static int
 345 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 346 {
 347         struct ieee80211com *ic = vap->iv_ic;
 348         struct ieee80211_node *ni;
 349         enum ieee80211_state ostate;
 350         int error;
 351
 352         IEEE80211_LOCK_ASSERT(ic);
 353
 354         ostate = vap->iv_state;
 355         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
 356                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 357         vap->iv_state = nstate;                 /* state transition */
 358         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 359         if (ostate != IEEE80211_S_SCAN)
 360                 ieee80211_cancel_scan(vap);     /* background scan */
 361         ni = vap->iv_bss;                       /* NB: no reference held */
 362         error = 0;
 363         switch (nstate) {
 364         case IEEE80211_S_INIT:
 365                 switch (ostate) {
 366                 case IEEE80211_S_SCAN:
 367                         ieee80211_cancel_scan(vap);
 368                         break;
 369                 default:
 370                         break;
 371                 }
 372                 if (ostate != IEEE80211_S_INIT) {
 373                         /* NB: optimize INIT -> INIT case */
 374                         ieee80211_reset_bss(vap);
 375                 }
 376                 break;
 377         case IEEE80211_S_SCAN:
 378                 switch (ostate) {
 379                 case IEEE80211_S_INIT:
 380                         ieee80211_check_scan_current(vap);
 381                         break;
 382                 default:
 383                         break;
 384                 }
 385                 break;
 386         case IEEE80211_S_RUN:
 387                 if (ostate == IEEE80211_S_INIT) {
 388                         /*
 389                          * Already have a channel; bypass the scan
 390                          * and startup immediately.
 391                          */
 392                         error = ieee80211_create_wds(vap, ic->ic_curchan);
 393                 }
 394                 break;
 395         default:
 396                 break;
 397         }
 398         return error;
 399 }
 400
 401 /*
 402  * Process a received frame.  The node associated with the sender
 403  * should be supplied.  If nothing was found in the node table then
 404  * the caller is assumed to supply a reference to iv_bss instead.
 405  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 406  * during AP scanning to select a AP to associate with; it can have
 407  * any units so long as values have consistent units and higher values
 408  * mean ``better signal''.  The receive timestamp is currently not used
 409  * by the 802.11 layer.
 410  */
 411 static int
 412 wds_input(struct ieee80211_node *ni, struct mbuf *m,
 413     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 414 {
 415         struct ieee80211vap *vap = ni->ni_vap;
 416         struct ieee80211com *ic = ni->ni_ic;
 417         struct ifnet *ifp = vap->iv_ifp;
 418         struct ieee80211_frame *wh;
 419         struct ieee80211_key *key;
 420         struct ether_header *eh;
 421         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 422         uint8_t dir, type, subtype, qos;
 423         uint16_t rxseq;
 424
 425         if (m->m_flags & M_AMPDU_MPDU) {
 426                 /*
 427                  * Fastpath for A-MPDU reorder q resubmission.  Frames
 428                  * w/ M_AMPDU_MPDU marked have already passed through
 429                  * here but were received out of order and been held on
 430                  * the reorder queue.  When resubmitted they are marked
 431                  * with the M_AMPDU_MPDU flag and we can bypass most of
 432                  * the normal processing.
 433                  */
 434                 wh = mtod(m, struct ieee80211_frame *);
 435                 type = IEEE80211_FC0_TYPE_DATA;
 436                 dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 437                 subtype = IEEE80211_FC0_SUBTYPE_QOS;
 438                 hdrspace = ieee80211_hdrspace(ic, wh);  /* XXX optimize? */
 439                 goto resubmit_ampdu;
 440         }
 441
 442         KASSERT(ni != NULL, ("null node"));
 443
 444         type = -1;                      /* undefined */
 445
 446         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) {
 447                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 448                     ni->ni_macaddr, NULL,
 449                     "too short (1): len %u", m->m_pkthdr.len);
 450                 vap->iv_stats.is_rx_tooshort++;
 451                 goto out;
 452         }
 453         /*
 454          * Bit of a cheat here, we use a pointer for a 3-address
 455          * frame format but don't reference fields past outside
 456          * ieee80211_frame_min w/o first validating the data is
 457          * present.
 458          */
 459         wh = mtod(m, struct ieee80211_frame *);
 460
 461         if (!IEEE80211_IS_MULTICAST(wh->i_addr1))
 462                 ni->ni_inact = ni->ni_inact_reload;
 463
 464         if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
 465             IEEE80211_FC0_VERSION_0) {
 466                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 467                     ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x",
 468                     wh->i_fc[0], wh->i_fc[1]);
 469                 vap->iv_stats.is_rx_badversion++;
 470                 goto err;
 471         }
 472
 473         dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK;
 474         type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
 475         subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
 476
 477         /* NB: WDS vap's do not scan */
 478         if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_addr4)) {
 479                 IEEE80211_DISCARD_MAC(vap,
 480                     IEEE80211_MSG_ANY, ni->ni_macaddr, NULL,
 481                     "too short (3): len %u", m->m_pkthdr.len);
 482                 vap->iv_stats.is_rx_tooshort++;
 483                 goto out;
 484         }
 485         /* NB: the TA is implicitly verified by finding the wds peer node */
 486         if (!IEEE80211_ADDR_EQ(wh->i_addr1, vap->iv_myaddr) &&
 487             !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) {
 488                 /* not interested in */
 489                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 490                     wh->i_addr1, NULL, "%s", "not to bss");
 491                 vap->iv_stats.is_rx_wrongbss++;
 492                 goto out;
 493         }
 494         IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
 495         ni->ni_noise = nf;
 496         if (IEEE80211_HAS_SEQ(type, subtype)) {
 497                 uint8_t tid = ieee80211_gettid(wh);
 498                 if (IEEE80211_QOS_HAS_SEQ(wh) &&
 499                     TID_TO_WME_AC(tid) >= WME_AC_VI)
 500                         ic->ic_wme.wme_hipri_traffic++;
 501                 rxseq = le16toh(*(uint16_t *)wh->i_seq);
 502                 if (! ieee80211_check_rxseq(ni, wh)) {
 503                         /* duplicate, discard */
 504                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 505                             wh->i_addr1, "duplicate",
 506                             "seqno <%u,%u> fragno <%u,%u> tid %u",
 507                             rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 508                             ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
 509                             rxseq & IEEE80211_SEQ_FRAG_MASK,
 510                             ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
 511                             tid);
 512                         vap->iv_stats.is_rx_dup++;
 513                         IEEE80211_NODE_STAT(ni, rx_dup);
 514                         goto out;
 515                 }
 516                 ni->ni_rxseqs[tid] = rxseq;
 517         }
 518         switch (type) {
 519         case IEEE80211_FC0_TYPE_DATA:
 520                 hdrspace = ieee80211_hdrspace(ic, wh);
 521                 if (m->m_len < hdrspace &&
 522                     (m = m_pullup(m, hdrspace)) == NULL) {
 523                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 524                             ni->ni_macaddr, NULL,
 525                             "data too short: expecting %u", hdrspace);
 526                         vap->iv_stats.is_rx_tooshort++;
 527                         goto out;               /* XXX */
 528                 }
 529                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
 530                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 531                             wh, "data", "incorrect dir 0x%x", dir);
 532                         vap->iv_stats.is_rx_wrongdir++;
 533                         goto out;
 534                 }
 535                 /*
 536                  * Only legacy WDS traffic should take this path.
 537                  */
 538                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
 539                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 540                             wh, "data", "%s", "not legacy wds");
 541                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
 542                         goto out;
 543                 }
 544                 /*
 545                  * Handle A-MPDU re-ordering.  If the frame is to be
 546                  * processed directly then ieee80211_ampdu_reorder
 547                  * will return 0; otherwise it has consumed the mbuf
 548                  * and we should do nothing more with it.
 549                  */
 550                 if ((m->m_flags & M_AMPDU) &&
 551                     ieee80211_ampdu_reorder(ni, m) != 0) {
 552                         m = NULL;
 553                         goto out;
 554                 }
 555         resubmit_ampdu:
 556
 557                 /*
 558                  * Handle privacy requirements.  Note that we
 559                  * must not be preempted from here until after
 560                  * we (potentially) call ieee80211_crypto_demic;
 561                  * otherwise we may violate assumptions in the
 562                  * crypto cipher modules used to do delayed update
 563                  * of replay sequence numbers.
 564                  */
 565                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 566                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 567                                 /*
 568                                  * Discard encrypted frames when privacy is off.
 569                                  */
 570                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 571                                     wh, "WEP", "%s", "PRIVACY off");
 572                                 vap->iv_stats.is_rx_noprivacy++;
 573                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 574                                 goto out;
 575                         }
 576                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 577                         if (key == NULL) {
 578                                 /* NB: stats+msgs handled in crypto_decap */
 579                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 580                                 goto out;
 581                         }
 582                         wh = mtod(m, struct ieee80211_frame *);
 583                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 584                 } else {
 585                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 586                         key = NULL;
 587                 }
 588
 589                 /*
 590                  * Save QoS bits for use below--before we strip the header.
 591                  */
 592                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 593                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 594                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 595                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 596                 } else
 597                         qos = 0;
 598
 599                 /*
 600                  * Next up, any fragmentation.
 601                  */
 602                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 603                         m = ieee80211_defrag(ni, m, hdrspace);
 604                         if (m == NULL) {
 605                                 /* Fragment dropped or frame not complete yet */
 606                                 goto out;
 607                         }
 608                 }
 609                 wh = NULL;              /* no longer valid, catch any uses */
 610
 611                 /*
 612                  * Next strip any MSDU crypto bits.
 613                  */
 614                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 615                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 616                             ni->ni_macaddr, "data", "%s", "demic error");
 617                         vap->iv_stats.is_rx_demicfail++;
 618                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 619                         goto out;
 620                 }
 621
 622                 /* copy to listener after decrypt */
 623                 if (ieee80211_radiotap_active_vap(vap))
 624                         ieee80211_radiotap_rx(vap, m);
 625                 need_tap = 0;
 626
 627                 /*
 628                  * Finally, strip the 802.11 header.
 629                  */
 630                 m = ieee80211_decap(vap, m, hdrspace);
 631                 if (m == NULL) {
 632                         /* XXX mask bit to check for both */
 633                         /* don't count Null data frames as errors */
 634                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 635                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 636                                 goto out;
 637                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 638                             ni->ni_macaddr, "data", "%s", "decap error");
 639                         vap->iv_stats.is_rx_decap++;
 640                         IEEE80211_NODE_STAT(ni, rx_decap);
 641                         goto err;
 642                 }
 643                 eh = mtod(m, struct ether_header *);
 644                 if (!ieee80211_node_is_authorized(ni)) {
 645                         /*
 646                          * Deny any non-PAE frames received prior to
 647                          * authorization.  For open/shared-key
 648                          * authentication the port is mark authorized
 649                          * after authentication completes.  For 802.1x
 650                          * the port is not marked authorized by the
 651                          * authenticator until the handshake has completed.
 652                          */
 653                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 654                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 655                                     eh->ether_shost, "data",
 656                                     "unauthorized port: ether type 0x%x len %u",
 657                                     eh->ether_type, m->m_pkthdr.len);
 658                                 vap->iv_stats.is_rx_unauth++;
 659                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 660                                 goto err;
 661                         }
 662                 } else {
 663                         /*
 664                          * When denying unencrypted frames, discard
 665                          * any non-PAE frames received without encryption.
 666                          */
 667                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 668                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 669                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 670                                 /*
 671                                  * Drop unencrypted frames.
 672                                  */
 673                                 vap->iv_stats.is_rx_unencrypted++;
 674                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 675                                 goto out;
 676                         }
 677                 }
 678                 /* XXX require HT? */
 679                 if (qos & IEEE80211_QOS_AMSDU) {
 680                         m = ieee80211_decap_amsdu(ni, m);
 681                         if (m == NULL)
 682                                 return IEEE80211_FC0_TYPE_DATA;
 683                 } else {
 684 #ifdef IEEE80211_SUPPORT_SUPERG
 685                         m = ieee80211_decap_fastframe(vap, ni, m);
 686                         if (m == NULL)
 687                                 return IEEE80211_FC0_TYPE_DATA;
 688 #endif
 689                 }
 690                 ieee80211_deliver_data(vap, ni, m);
 691                 return IEEE80211_FC0_TYPE_DATA;
 692
 693         case IEEE80211_FC0_TYPE_MGT:
 694                 vap->iv_stats.is_rx_mgmt++;
 695                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 696                 if (dir != IEEE80211_FC1_DIR_NODS) {
 697                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 698                             wh, "data", "incorrect dir 0x%x", dir);
 699                         vap->iv_stats.is_rx_wrongdir++;
 700                         goto err;
 701                 }
 702                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 703                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 704                             ni->ni_macaddr, "mgt", "too short: len %u",
 705                             m->m_pkthdr.len);
 706                         vap->iv_stats.is_rx_tooshort++;
 707                         goto out;
 708                 }
 709 #ifdef IEEE80211_DEBUG
 710                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
 711                         if_printf(ifp, "received %s from %s rssi %d\n",
 712                             ieee80211_mgt_subtype_name[subtype >>
 713                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 714                             ether_sprintf(wh->i_addr2), rssi);
 715                 }
 716 #endif
 717                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 718                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 719                             wh, NULL, "%s", "WEP set but not permitted");
 720                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 721                         goto out;
 722                 }
 723                 vap->iv_recv_mgmt(ni, m, subtype, rxs, rssi, nf);
 724                 goto out;
 725
 726         case IEEE80211_FC0_TYPE_CTL:
 727                 vap->iv_stats.is_rx_ctl++;
 728                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 729                 goto out;
 730
 731         default:
 732                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 733                     wh, "bad", "frame type 0x%x", type);
 734                 /* should not come here */
 735                 break;
 736         }
 737 err:
 738         if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
 739 out:
 740         if (m != NULL) {
 741                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 742                         ieee80211_radiotap_rx(vap, m);
 743                 m_freem(m);
 744         }
 745         return type;
 746 }
 747
 748 static void
 749 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, int subtype,
 750     const struct ieee80211_rx_stats *rxs, int rssi, int nf)
 751 {
 752         struct ieee80211vap *vap = ni->ni_vap;
 753         struct ieee80211com *ic = ni->ni_ic;
 754         struct ieee80211_frame *wh;
 755         u_int8_t *frm, *efrm;
 756
 757         wh = mtod(m0, struct ieee80211_frame *);
 758         frm = (u_int8_t *)&wh[1];
 759         efrm = mtod(m0, u_int8_t *) + m0->m_len;
 760         switch (subtype) {
 761         case IEEE80211_FC0_SUBTYPE_ACTION:
 762         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 763                 if (ni == vap->iv_bss) {
 764                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 765                             wh, NULL, "%s", "unknown node");
 766                         vap->iv_stats.is_rx_mgtdiscard++;
 767                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
 768                         /* NB: not interested in multicast frames. */
 769                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 770                             wh, NULL, "%s", "not for us");
 771                         vap->iv_stats.is_rx_mgtdiscard++;
 772                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 773                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 774                             wh, NULL, "wrong state %s",
 775                             ieee80211_state_name[vap->iv_state]);
 776                         vap->iv_stats.is_rx_mgtdiscard++;
 777                 } else {
 778                         if (ieee80211_parse_action(ni, m0) == 0)
 779                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 780                 }
 781                 break;
 782
 783         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 784         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 785         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 786         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 787         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 788         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 789         case IEEE80211_FC0_SUBTYPE_BEACON:
 790         case IEEE80211_FC0_SUBTYPE_ATIM:
 791         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 792         case IEEE80211_FC0_SUBTYPE_AUTH:
 793         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 794                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 795                     wh, NULL, "%s", "not handled");
 796                 vap->iv_stats.is_rx_mgtdiscard++;
 797                 break;
 798
 799         default:
 800                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 801                     wh, "mgt", "subtype 0x%x not handled", subtype);
 802                 vap->iv_stats.is_rx_badsubtype++;
 803                 break;
 804         }
 805 }