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_media.h>
  52 #include <net/if_llc.h>
  53 #include <net/ethernet.h>
  54
  55 #include <net/bpf.h>
  56
  57 #include <net80211/ieee80211_var.h>
  58 #include <net80211/ieee80211_wds.h>
  59 #include <net80211/ieee80211_input.h>
  60 #ifdef IEEE80211_SUPPORT_SUPERG
  61 #include <net80211/ieee80211_superg.h>
  62 #endif
  63
  64 static void wds_vattach(struct ieee80211vap *);
  65 static int wds_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  66 static  int wds_input(struct ieee80211_node *ni, struct mbuf *m, int, int);
  67 static void wds_recv_mgmt(struct ieee80211_node *, struct mbuf *,
  68             int subtype, int, int);
  69
  70 void
  71 ieee80211_wds_attach(struct ieee80211com *ic)
  72 {
  73         ic->ic_vattach[IEEE80211_M_WDS] = wds_vattach;
  74 }
  75
  76 void
  77 ieee80211_wds_detach(struct ieee80211com *ic)
  78 {
  79 }
  80
  81 static void
  82 wds_vdetach(struct ieee80211vap *vap)
  83 {
  84         if (vap->iv_bss != NULL) {
  85                 /* XXX locking? */
  86                 if (vap->iv_bss->ni_wdsvap == vap)
  87                         vap->iv_bss->ni_wdsvap = NULL;
  88         }
  89 }
  90
  91 static void
  92 wds_vattach(struct ieee80211vap *vap)
  93 {
  94         vap->iv_newstate = wds_newstate;
  95         vap->iv_input = wds_input;
  96         vap->iv_recv_mgmt = wds_recv_mgmt;
  97         vap->iv_opdetach = wds_vdetach;
  98 }
  99
 100 static void
 101 wds_flush(struct ieee80211_node *ni)
 102 {
 103         struct ieee80211com *ic = ni->ni_ic;
 104         struct mbuf *m, *next;
 105         int8_t rssi, nf;
 106
 107         m = ieee80211_ageq_remove(&ic->ic_stageq,
 108             (void *)(uintptr_t) ieee80211_mac_hash(ic, ni->ni_macaddr));
 109         if (m == NULL)
 110                 return;
 111
 112         IEEE80211_NOTE(ni->ni_vap, IEEE80211_MSG_WDS, ni,
 113             "%s", "flush wds queue");
 114         ic->ic_node_getsignal(ni, &rssi, &nf);
 115         for (; m != NULL; m = next) {
 116                 next = m->m_nextpkt;
 117                 m->m_nextpkt = NULL;
 118                 ieee80211_input(ni, m, rssi, nf);
 119         }
 120 }
 121
 122 static int
 123 ieee80211_create_wds(struct ieee80211vap *vap, struct ieee80211_channel *chan)
 124 {
 125         struct ieee80211com *ic = vap->iv_ic;
 126         struct ieee80211_node_table *nt = &ic->ic_sta;
 127         struct ieee80211_node *ni, *obss;
 128
 129         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 130              "%s: creating link to %s on channel %u\n", __func__,
 131              ether_sprintf(vap->iv_des_bssid), ieee80211_chan2ieee(ic, chan));
 132
 133         /* NB: vap create must specify the bssid for the link */
 134         KASSERT(vap->iv_flags & IEEE80211_F_DESBSSID, ("no bssid"));
 135         /* NB: we should only be called on RUN transition */
 136         KASSERT(vap->iv_state == IEEE80211_S_RUN, ("!RUN state"));
 137
 138         if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
 139                 /*
 140                  * Dynamic/non-legacy WDS.  Reference the associated
 141                  * station specified by the desired bssid setup at vap
 142                  * create.  Point ni_wdsvap at the WDS vap so 4-address
 143                  * frames received through the associated AP vap will
 144                  * be dispatched upward (e.g. to a bridge) as though
 145                  * they arrived on the WDS vap.
 146                  */
 147                 IEEE80211_NODE_LOCK(nt);
 148                 obss = NULL;
 149                 ni = ieee80211_find_node_locked(&ic->ic_sta, vap->iv_des_bssid);
 150                 if (ni == NULL) {
 151                         /*
 152                          * Node went away before we could hookup.  This
 153                          * should be ok; no traffic will flow and a leave
 154                          * event will be dispatched that should cause
 155                          * the vap to be destroyed.
 156                          */
 157                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 158                             "%s: station %s went away\n",
 159                             __func__, ether_sprintf(vap->iv_des_bssid));
 160                         /* XXX stat? */
 161                 } else if (ni->ni_wdsvap != NULL) {
 162                         /*
 163                          * Node already setup with a WDS vap; we cannot
 164                          * allow multiple references so disallow.  If
 165                          * ni_wdsvap points at us that's ok; we should
 166                          * do nothing anyway.
 167                          */
 168                         /* XXX printf instead? */
 169                         IEEE80211_DPRINTF(vap, IEEE80211_MSG_WDS,
 170                             "%s: station %s in use with %s\n",
 171                             __func__, ether_sprintf(vap->iv_des_bssid),
 172                             ni->ni_wdsvap->iv_ifp->if_xname);
 173                         /* XXX stat? */
 174                 } else {
 175                         /*
 176                          * Committed to new node, setup state.
 177                          */
 178                         obss = vap->iv_bss;
 179                         vap->iv_bss = ni;
 180                         ni->ni_wdsvap = vap;
 181                 }
 182                 IEEE80211_NODE_UNLOCK(nt);
 183                 if (obss != NULL) {
 184                         /* NB: deferred to avoid recursive lock */
 185                         ieee80211_free_node(obss);
 186                 }
 187         } else {
 188                 /*
 189                  * Legacy WDS vap setup.
 190                  */
 191                 /*
 192                  * The far end does not associate so we just create
 193                  * create a new node and install it as the vap's
 194                  * bss node.  We must simulate an association and
 195                  * authorize the port for traffic to flow.
 196                  * XXX check if node already in sta table?
 197                  */
 198                 ni = ieee80211_node_create_wds(vap, vap->iv_des_bssid, chan);
 199                 if (ni != NULL) {
 200                         obss = vap->iv_bss;
 201                         vap->iv_bss = ieee80211_ref_node(ni);
 202                         ni->ni_flags |= IEEE80211_NODE_AREF;
 203                         if (obss != NULL)
 204                                 ieee80211_free_node(obss);
 205                         /* give driver a chance to setup state like ni_txrate */
 206                         if (ic->ic_newassoc != NULL)
 207                                 ic->ic_newassoc(ni, 1);
 208                         /* tell the authenticator about new station */
 209                         if (vap->iv_auth->ia_node_join != NULL)
 210                                 vap->iv_auth->ia_node_join(ni);
 211                         if (ni->ni_authmode != IEEE80211_AUTH_8021X)
 212                                 ieee80211_node_authorize(ni);
 213
 214                         ieee80211_notify_node_join(ni, 1 /*newassoc*/);
 215                         /* XXX inject l2uf frame */
 216                 }
 217         }
 218
 219         /*
 220          * Flush any pending frames now that were setup.
 221          */
 222         if (ni != NULL)
 223                 wds_flush(ni);
 224         return (ni == NULL ? ENOENT : 0);
 225 }
 226
 227 /*
 228  * Propagate multicast frames of an ap vap to all DWDS links.
 229  * The caller is assumed to have verified this frame is multicast.
 230  */
 231 void
 232 ieee80211_dwds_mcast(struct ieee80211vap *vap0, struct mbuf *m)
 233 {
 234         struct ieee80211com *ic = vap0->iv_ic;
 235         const struct ether_header *eh = mtod(m, const struct ether_header *);
 236         struct ieee80211_node *ni;
 237         struct ieee80211vap *vap;
 238         struct ifnet *ifp;
 239         struct mbuf *mcopy;
 240         int err;
 241
 242         KASSERT(ETHER_IS_MULTICAST(eh->ether_dhost),
 243             ("%s not mcast", ether_sprintf(eh->ether_dhost)));
 244
 245         /* XXX locking */
 246         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 247                 /* only DWDS vaps are interesting */
 248                 if (vap->iv_opmode != IEEE80211_M_WDS ||
 249                     (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY))
 250                         continue;
 251                 /* if it came in this interface, don't send it back out */
 252                 ifp = vap->iv_ifp;
 253                 if (ifp == m->m_pkthdr.rcvif)
 254                         continue;
 255                 /*
 256                  * Duplicate the frame and send it.
 257                  */
 258                 mcopy = m_copypacket(m, M_NOWAIT);
 259                 if (mcopy == NULL) {
 260                         ifp->if_oerrors++;
 261                         /* XXX stat + msg */
 262                         continue;
 263                 }
 264                 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
 265                 if (ni == NULL) {
 266                         /* NB: ieee80211_find_txnode does stat+msg */
 267                         ifp->if_oerrors++;
 268                         m_freem(mcopy);
 269                         continue;
 270                 }
 271                 /* calculate priority so drivers can find the tx queue */
 272                 if (ieee80211_classify(ni, mcopy)) {
 273                         IEEE80211_DISCARD_MAC(vap,
 274                             IEEE80211_MSG_OUTPUT | IEEE80211_MSG_WDS,
 275                             eh->ether_dhost, NULL,
 276                             "%s", "classification failure");
 277                         vap->iv_stats.is_tx_classify++;
 278                         ifp->if_oerrors++;
 279                         m_freem(mcopy);
 280                         ieee80211_free_node(ni);
 281                         continue;
 282                 }
 283
 284                 BPF_MTAP(ifp, m);               /* 802.3 tx */
 285
 286                 /*
 287                  * Encapsulate the packet in prep for transmission.
 288                  */
 289                 mcopy = ieee80211_encap(vap, ni, mcopy);
 290                 if (mcopy == NULL) {
 291                         /* NB: stat+msg handled in ieee80211_encap */
 292                         ieee80211_free_node(ni);
 293                         continue;
 294                 }
 295                 mcopy->m_flags |= M_MCAST;
 296                 mcopy->m_pkthdr.rcvif = (void *) ni;
 297
 298                 err = ieee80211_parent_xmitpkt(ic, mcopy);
 299                 if (err) {
 300                         /* NB: IFQ_HANDOFF reclaims mbuf */
 301                         ifp->if_oerrors++;
 302                         ieee80211_free_node(ni);
 303                 } else {
 304                         ifp->if_opackets++;
 305                         if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
 306                         if_inc_counter(ifp, IFCOUNTER_OBYTES,
 307                             m->m_pkthdr.len);
 308                 }
 309         }
 310 }
 311
 312 /*
 313  * Handle DWDS discovery on receipt of a 4-address frame in
 314  * ap mode.  Queue the frame and post an event for someone
 315  * to plumb the necessary WDS vap for this station.  Frames
 316  * received prior to the vap set running will then be reprocessed
 317  * as if they were just received.
 318  */
 319 void
 320 ieee80211_dwds_discover(struct ieee80211_node *ni, struct mbuf *m)
 321 {
 322         struct ieee80211com *ic = ni->ni_ic;
 323
 324         /*
 325          * Save the frame with an aging interval 4 times
 326          * the listen interval specified by the station.
 327          * Frames that sit around too long are reclaimed
 328          * using this information.
 329          * XXX handle overflow?
 330          * XXX per/vap beacon interval?
 331          */
 332         m->m_pkthdr.rcvif = (void *)(uintptr_t)
 333             ieee80211_mac_hash(ic, ni->ni_macaddr);
 334         (void) ieee80211_ageq_append(&ic->ic_stageq, m,
 335             ((ni->ni_intval * ic->ic_lintval) << 2) / 1024);
 336         ieee80211_notify_wds_discover(ni);
 337 }
 338
 339 /*
 340  * IEEE80211_M_WDS vap state machine handler.
 341  */
 342 static int
 343 wds_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 344 {
 345         struct ieee80211com *ic = vap->iv_ic;
 346         struct ieee80211_node *ni;
 347         enum ieee80211_state ostate;
 348         int error;
 349
 350         IEEE80211_LOCK_ASSERT(ic);
 351
 352         ostate = vap->iv_state;
 353         IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s\n", __func__,
 354                 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
 355         vap->iv_state = nstate;                 /* state transition */
 356         callout_stop(&vap->iv_mgtsend);         /* XXX callout_drain */
 357         if (ostate != IEEE80211_S_SCAN)
 358                 ieee80211_cancel_scan(vap);     /* background scan */
 359         ni = vap->iv_bss;                       /* NB: no reference held */
 360         error = 0;
 361         switch (nstate) {
 362         case IEEE80211_S_INIT:
 363                 switch (ostate) {
 364                 case IEEE80211_S_SCAN:
 365                         ieee80211_cancel_scan(vap);
 366                         break;
 367                 default:
 368                         break;
 369                 }
 370                 if (ostate != IEEE80211_S_INIT) {
 371                         /* NB: optimize INIT -> INIT case */
 372                         ieee80211_reset_bss(vap);
 373                 }
 374                 break;
 375         case IEEE80211_S_SCAN:
 376                 switch (ostate) {
 377                 case IEEE80211_S_INIT:
 378                         ieee80211_check_scan_current(vap);
 379                         break;
 380                 default:
 381                         break;
 382                 }
 383                 break;
 384         case IEEE80211_S_RUN:
 385                 if (ostate == IEEE80211_S_INIT) {
 386                         /*
 387                          * Already have a channel; bypass the scan
 388                          * and startup immediately.
 389                          */
 390                         error = ieee80211_create_wds(vap, ic->ic_curchan);
 391                 }
 392                 break;
 393         default:
 394                 break;
 395         }
 396         return error;
 397 }
 398
 399 /*
 400  * Process a received frame.  The node associated with the sender
 401  * should be supplied.  If nothing was found in the node table then
 402  * the caller is assumed to supply a reference to iv_bss instead.
 403  * The RSSI and a timestamp are also supplied.  The RSSI data is used
 404  * during AP scanning to select a AP to associate with; it can have
 405  * any units so long as values have consistent units and higher values
 406  * mean ``better signal''.  The receive timestamp is currently not used
 407  * by the 802.11 layer.
 408  */
 409 static int
 410 wds_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
 411 {
 412 #define HAS_SEQ(type)   ((type & 0x4) == 0)
 413         struct ieee80211vap *vap = ni->ni_vap;
 414         struct ieee80211com *ic = ni->ni_ic;
 415         struct ifnet *ifp = vap->iv_ifp;
 416         struct ieee80211_frame *wh;
 417         struct ieee80211_key *key;
 418         struct ether_header *eh;
 419         int hdrspace, need_tap = 1;     /* mbuf need to be tapped. */
 420         uint8_t dir, type, subtype, qos;
 421         uint16_t rxseq;
 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 (HAS_SEQ(type)) {
 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                 rxseq = le16toh(*(uint16_t *)wh->i_seq);
 500                 if (! ieee80211_check_rxseq(ni, wh)) {
 501                         /* duplicate, discard */
 502                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 503                             wh->i_addr1, "duplicate",
 504                             "seqno <%u,%u> fragno <%u,%u> tid %u",
 505                             rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
 506                             ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT,
 507                             rxseq & IEEE80211_SEQ_FRAG_MASK,
 508                             ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK,
 509                             tid);
 510                         vap->iv_stats.is_rx_dup++;
 511                         IEEE80211_NODE_STAT(ni, rx_dup);
 512                         goto out;
 513                 }
 514                 ni->ni_rxseqs[tid] = rxseq;
 515         }
 516         switch (type) {
 517         case IEEE80211_FC0_TYPE_DATA:
 518                 hdrspace = ieee80211_hdrspace(ic, wh);
 519                 if (m->m_len < hdrspace &&
 520                     (m = m_pullup(m, hdrspace)) == NULL) {
 521                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 522                             ni->ni_macaddr, NULL,
 523                             "data too short: expecting %u", hdrspace);
 524                         vap->iv_stats.is_rx_tooshort++;
 525                         goto out;               /* XXX */
 526                 }
 527                 if (dir != IEEE80211_FC1_DIR_DSTODS) {
 528                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 529                             wh, "data", "incorrect dir 0x%x", dir);
 530                         vap->iv_stats.is_rx_wrongdir++;
 531                         goto out;
 532                 }
 533                 /*
 534                  * Only legacy WDS traffic should take this path.
 535                  */
 536                 if ((vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0) {
 537                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 538                             wh, "data", "%s", "not legacy wds");
 539                         vap->iv_stats.is_rx_wrongdir++;/*XXX*/
 540                         goto out;
 541                 }
 542                 /*
 543                  * Handle A-MPDU re-ordering.  If the frame is to be
 544                  * processed directly then ieee80211_ampdu_reorder
 545                  * will return 0; otherwise it has consumed the mbuf
 546                  * and we should do nothing more with it.
 547                  */
 548                 if ((m->m_flags & M_AMPDU) &&
 549                     ieee80211_ampdu_reorder(ni, m) != 0) {
 550                         m = NULL;
 551                         goto out;
 552                 }
 553         resubmit_ampdu:
 554
 555                 /*
 556                  * Handle privacy requirements.  Note that we
 557                  * must not be preempted from here until after
 558                  * we (potentially) call ieee80211_crypto_demic;
 559                  * otherwise we may violate assumptions in the
 560                  * crypto cipher modules used to do delayed update
 561                  * of replay sequence numbers.
 562                  */
 563                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 564                         if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
 565                                 /*
 566                                  * Discard encrypted frames when privacy is off.
 567                                  */
 568                                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 569                                     wh, "WEP", "%s", "PRIVACY off");
 570                                 vap->iv_stats.is_rx_noprivacy++;
 571                                 IEEE80211_NODE_STAT(ni, rx_noprivacy);
 572                                 goto out;
 573                         }
 574                         key = ieee80211_crypto_decap(ni, m, hdrspace);
 575                         if (key == NULL) {
 576                                 /* NB: stats+msgs handled in crypto_decap */
 577                                 IEEE80211_NODE_STAT(ni, rx_wepfail);
 578                                 goto out;
 579                         }
 580                         wh = mtod(m, struct ieee80211_frame *);
 581                         wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
 582                 } else {
 583                         /* XXX M_WEP and IEEE80211_F_PRIVACY */
 584                         key = NULL;
 585                 }
 586
 587                 /*
 588                  * Save QoS bits for use below--before we strip the header.
 589                  */
 590                 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
 591                         qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
 592                             ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
 593                             ((struct ieee80211_qosframe *)wh)->i_qos[0];
 594                 } else
 595                         qos = 0;
 596
 597                 /*
 598                  * Next up, any fragmentation.
 599                  */
 600                 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
 601                         m = ieee80211_defrag(ni, m, hdrspace);
 602                         if (m == NULL) {
 603                                 /* Fragment dropped or frame not complete yet */
 604                                 goto out;
 605                         }
 606                 }
 607                 wh = NULL;              /* no longer valid, catch any uses */
 608
 609                 /*
 610                  * Next strip any MSDU crypto bits.
 611                  */
 612                 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
 613                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 614                             ni->ni_macaddr, "data", "%s", "demic error");
 615                         vap->iv_stats.is_rx_demicfail++;
 616                         IEEE80211_NODE_STAT(ni, rx_demicfail);
 617                         goto out;
 618                 }
 619
 620                 /* copy to listener after decrypt */
 621                 if (ieee80211_radiotap_active_vap(vap))
 622                         ieee80211_radiotap_rx(vap, m);
 623                 need_tap = 0;
 624
 625                 /*
 626                  * Finally, strip the 802.11 header.
 627                  */
 628                 m = ieee80211_decap(vap, m, hdrspace);
 629                 if (m == NULL) {
 630                         /* XXX mask bit to check for both */
 631                         /* don't count Null data frames as errors */
 632                         if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
 633                             subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
 634                                 goto out;
 635                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 636                             ni->ni_macaddr, "data", "%s", "decap error");
 637                         vap->iv_stats.is_rx_decap++;
 638                         IEEE80211_NODE_STAT(ni, rx_decap);
 639                         goto err;
 640                 }
 641                 eh = mtod(m, struct ether_header *);
 642                 if (!ieee80211_node_is_authorized(ni)) {
 643                         /*
 644                          * Deny any non-PAE frames received prior to
 645                          * authorization.  For open/shared-key
 646                          * authentication the port is mark authorized
 647                          * after authentication completes.  For 802.1x
 648                          * the port is not marked authorized by the
 649                          * authenticator until the handshake has completed.
 650                          */
 651                         if (eh->ether_type != htons(ETHERTYPE_PAE)) {
 652                                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
 653                                     eh->ether_shost, "data",
 654                                     "unauthorized port: ether type 0x%x len %u",
 655                                     eh->ether_type, m->m_pkthdr.len);
 656                                 vap->iv_stats.is_rx_unauth++;
 657                                 IEEE80211_NODE_STAT(ni, rx_unauth);
 658                                 goto err;
 659                         }
 660                 } else {
 661                         /*
 662                          * When denying unencrypted frames, discard
 663                          * any non-PAE frames received without encryption.
 664                          */
 665                         if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
 666                             (key == NULL && (m->m_flags & M_WEP) == 0) &&
 667                             eh->ether_type != htons(ETHERTYPE_PAE)) {
 668                                 /*
 669                                  * Drop unencrypted frames.
 670                                  */
 671                                 vap->iv_stats.is_rx_unencrypted++;
 672                                 IEEE80211_NODE_STAT(ni, rx_unencrypted);
 673                                 goto out;
 674                         }
 675                 }
 676                 /* XXX require HT? */
 677                 if (qos & IEEE80211_QOS_AMSDU) {
 678                         m = ieee80211_decap_amsdu(ni, m);
 679                         if (m == NULL)
 680                                 return IEEE80211_FC0_TYPE_DATA;
 681                 } else {
 682 #ifdef IEEE80211_SUPPORT_SUPERG
 683                         m = ieee80211_decap_fastframe(vap, ni, m);
 684                         if (m == NULL)
 685                                 return IEEE80211_FC0_TYPE_DATA;
 686 #endif
 687                 }
 688                 ieee80211_deliver_data(vap, ni, m);
 689                 return IEEE80211_FC0_TYPE_DATA;
 690
 691         case IEEE80211_FC0_TYPE_MGT:
 692                 vap->iv_stats.is_rx_mgmt++;
 693                 IEEE80211_NODE_STAT(ni, rx_mgmt);
 694                 if (dir != IEEE80211_FC1_DIR_NODS) {
 695                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 696                             wh, "data", "incorrect dir 0x%x", dir);
 697                         vap->iv_stats.is_rx_wrongdir++;
 698                         goto err;
 699                 }
 700                 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
 701                         IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
 702                             ni->ni_macaddr, "mgt", "too short: len %u",
 703                             m->m_pkthdr.len);
 704                         vap->iv_stats.is_rx_tooshort++;
 705                         goto out;
 706                 }
 707 #ifdef IEEE80211_DEBUG
 708                 if (ieee80211_msg_debug(vap) || ieee80211_msg_dumppkts(vap)) {
 709                         if_printf(ifp, "received %s from %s rssi %d\n",
 710                             ieee80211_mgt_subtype_name[subtype >>
 711                                 IEEE80211_FC0_SUBTYPE_SHIFT],
 712                             ether_sprintf(wh->i_addr2), rssi);
 713                 }
 714 #endif
 715                 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
 716                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 717                             wh, NULL, "%s", "WEP set but not permitted");
 718                         vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
 719                         goto out;
 720                 }
 721                 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
 722                 goto out;
 723
 724         case IEEE80211_FC0_TYPE_CTL:
 725                 vap->iv_stats.is_rx_ctl++;
 726                 IEEE80211_NODE_STAT(ni, rx_ctrl);
 727                 goto out;
 728
 729         default:
 730                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 731                     wh, "bad", "frame type 0x%x", type);
 732                 /* should not come here */
 733                 break;
 734         }
 735 err:
 736         ifp->if_ierrors++;
 737 out:
 738         if (m != NULL) {
 739                 if (need_tap && ieee80211_radiotap_active_vap(vap))
 740                         ieee80211_radiotap_rx(vap, m);
 741                 m_freem(m);
 742         }
 743         return type;
 744 }
 745
 746 static void
 747 wds_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
 748         int subtype, int rssi, int nf)
 749 {
 750         struct ieee80211vap *vap = ni->ni_vap;
 751         struct ieee80211com *ic = ni->ni_ic;
 752         struct ieee80211_frame *wh;
 753         u_int8_t *frm, *efrm;
 754
 755         wh = mtod(m0, struct ieee80211_frame *);
 756         frm = (u_int8_t *)&wh[1];
 757         efrm = mtod(m0, u_int8_t *) + m0->m_len;
 758         switch (subtype) {
 759         case IEEE80211_FC0_SUBTYPE_ACTION:
 760         case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
 761                 if (ni == vap->iv_bss) {
 762                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 763                             wh, NULL, "%s", "unknown node");
 764                         vap->iv_stats.is_rx_mgtdiscard++;
 765                 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1)) {
 766                         /* NB: not interested in multicast frames. */
 767                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 768                             wh, NULL, "%s", "not for us");
 769                         vap->iv_stats.is_rx_mgtdiscard++;
 770                 } else if (vap->iv_state != IEEE80211_S_RUN) {
 771                         IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 772                             wh, NULL, "wrong state %s",
 773                             ieee80211_state_name[vap->iv_state]);
 774                         vap->iv_stats.is_rx_mgtdiscard++;
 775                 } else {
 776                         if (ieee80211_parse_action(ni, m0) == 0)
 777                                 (void)ic->ic_recv_action(ni, wh, frm, efrm);
 778                 }
 779                 break;
 780
 781         case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
 782         case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
 783         case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
 784         case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
 785         case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
 786         case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
 787         case IEEE80211_FC0_SUBTYPE_BEACON:
 788         case IEEE80211_FC0_SUBTYPE_ATIM:
 789         case IEEE80211_FC0_SUBTYPE_DISASSOC:
 790         case IEEE80211_FC0_SUBTYPE_AUTH:
 791         case IEEE80211_FC0_SUBTYPE_DEAUTH:
 792                 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
 793                     wh, NULL, "%s", "not handled");
 794                 vap->iv_stats.is_rx_mgtdiscard++;
 795                 break;
 796
 797         default:
 798                 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
 799                     wh, "mgt", "subtype 0x%x not handled", subtype);
 800                 vap->iv_stats.is_rx_badsubtype++;
 801                 break;
 802         }
 803 }