sys/net80211/ieee80211_input.c

   1 /*-
   2  * Copyright (c) 2001 Atsushi Onoe
   3  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include "opt_wlan.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/mbuf.h>
  35 #include <sys/malloc.h>
  36 #include <sys/endian.h>
  37 #include <sys/kernel.h>
  38
  39 #include <sys/socket.h>
  40
  41 #include <net/ethernet.h>
  42 #include <net/if.h>
  43 #include <net/if_var.h>
  44 #include <net/if_llc.h>
  45 #include <net/if_media.h>
  46 #include <net/if_vlan_var.h>
  47
  48 #include <net80211/ieee80211_var.h>
  49 #include <net80211/ieee80211_input.h>
  50 #ifdef IEEE80211_SUPPORT_MESH
  51 #include <net80211/ieee80211_mesh.h>
  52 #endif
  53
  54 #include <net/bpf.h>
  55
  56 #ifdef INET
  57 #include <netinet/in.h>
  58 #include <net/ethernet.h>
  59 #endif
  60
  61 static void
  62 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
  63 {
  64         int i;
  65
  66         /* Verify the required MIMO bits are set */
  67         if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
  68             (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
  69                 return;
  70
  71         /* XXX This assumes the MIMO radios have both ctl and ext chains */
  72         for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
  73                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
  74                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
  75         }
  76
  77         /* XXX This also assumes the MIMO radios have both ctl and ext chains */
  78         for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
  79                 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
  80                 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
  81         }
  82         ni->ni_mimo_chains = rx->c_chain;
  83 }
  84
  85 int
  86 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
  87 {
  88         struct ieee80211_rx_stats rxs;
  89
  90         /* try to read stats from mbuf */
  91         bzero(&rxs, sizeof(rxs));
  92         if (ieee80211_get_rx_params(m, &rxs) != 0)
  93                 return (-1);
  94
  95         /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
  96         ieee80211_process_mimo(ni, &rxs);
  97
  98         //return ieee80211_input(ni, m, rx->rssi, rx->nf);
  99         return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
 100 }
 101
 102 int
 103 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
 104 {
 105         struct ieee80211_rx_stats rx;
 106
 107         rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
 108         rx.c_nf = nf;
 109         rx.c_rssi = rssi;
 110
 111         if (!ieee80211_add_rx_params(m, &rx))
 112                 return (-1);
 113
 114         return ieee80211_input_mimo_all(ic, m);
 115 }
 116
 117 int
 118 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
 119 {
 120         struct ieee80211vap *vap;
 121         int type = -1;
 122
 123         m->m_flags |= M_BCAST;          /* NB: mark for bpf tap'ing */
 124
 125         /* XXX locking */
 126         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 127                 struct ieee80211_node *ni;
 128                 struct mbuf *mcopy;
 129
 130                 /* NB: could check for IFF_UP but this is cheaper */
 131                 if (vap->iv_state == IEEE80211_S_INIT)
 132                         continue;
 133                 /*
 134                  * WDS vap's only receive directed traffic from the
 135                  * station at the ``far end''.  That traffic should
 136                  * be passed through the AP vap the station is associated
 137                  * to--so don't spam them with mcast frames.
 138                  */
 139                 if (vap->iv_opmode == IEEE80211_M_WDS)
 140                         continue;
 141                 if (TAILQ_NEXT(vap, iv_next) != NULL) {
 142                         /*
 143                          * Packet contents are changed by ieee80211_decap
 144                          * so do a deep copy of the packet.
 145                          * NB: tags are copied too.
 146                          */
 147                         mcopy = m_dup(m, M_NOWAIT);
 148                         if (mcopy == NULL) {
 149                                 /* XXX stat+msg */
 150                                 continue;
 151                         }
 152                 } else {
 153                         mcopy = m;
 154                         m = NULL;
 155                 }
 156                 ni = ieee80211_ref_node(vap->iv_bss);
 157                 type = ieee80211_input_mimo(ni, mcopy);
 158                 ieee80211_free_node(ni);
 159         }
 160         if (m != NULL)                  /* no vaps, reclaim mbuf */
 161                 m_freem(m);
 162         return type;
 163 }
 164
 165 /*
 166  * This function reassembles fragments.
 167  *
 168  * XXX should handle 3 concurrent reassemblies per-spec.
 169  */
 170 struct mbuf *
 171 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
 172 {
 173         struct ieee80211vap *vap = ni->ni_vap;
 174         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 175         struct ieee80211_frame *lwh;
 176         uint16_t rxseq;
 177         uint8_t fragno;
 178         uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
 179         struct mbuf *mfrag;
 180
 181         KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
 182
 183         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 184         fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
 185
 186         /* Quick way out, if there's nothing to defragment */
 187         if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
 188                 return m;
 189
 190         /*
 191          * Remove frag to insure it doesn't get reaped by timer.
 192          */
 193         if (ni->ni_table == NULL) {
 194                 /*
 195                  * Should never happen.  If the node is orphaned (not in
 196                  * the table) then input packets should not reach here.
 197                  * Otherwise, a concurrent request that yanks the table
 198                  * should be blocked by other interlocking and/or by first
 199                  * shutting the driver down.  Regardless, be defensive
 200                  * here and just bail
 201                  */
 202                 /* XXX need msg+stat */
 203                 m_freem(m);
 204                 return NULL;
 205         }
 206         IEEE80211_NODE_LOCK(ni->ni_table);
 207         mfrag = ni->ni_rxfrag[0];
 208         ni->ni_rxfrag[0] = NULL;
 209         IEEE80211_NODE_UNLOCK(ni->ni_table);
 210
 211         /*
 212          * Validate new fragment is in order and
 213          * related to the previous ones.
 214          */
 215         if (mfrag != NULL) {
 216                 uint16_t last_rxseq;
 217
 218                 lwh = mtod(mfrag, struct ieee80211_frame *);
 219                 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
 220                 /* NB: check seq # and frag together */
 221                 if (rxseq == last_rxseq+1 &&
 222                     IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
 223                     IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
 224                         /* XXX clear MORE_FRAG bit? */
 225                         /* track last seqnum and fragno */
 226                         *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
 227
 228                         m_adj(m, hdrspace);             /* strip header */
 229                         m_catpkt(mfrag, m);             /* concatenate */
 230                 } else {
 231                         /*
 232                          * Unrelated fragment or no space for it,
 233                          * clear current fragments.
 234                          */
 235                         m_freem(mfrag);
 236                         mfrag = NULL;
 237                 }
 238         }
 239
 240         if (mfrag == NULL) {
 241                 if (fragno != 0) {              /* !first fragment, discard */
 242                         vap->iv_stats.is_rx_defrag++;
 243                         IEEE80211_NODE_STAT(ni, rx_defrag);
 244                         m_freem(m);
 245                         return NULL;
 246                 }
 247                 mfrag = m;
 248         }
 249         if (more_frag) {                        /* more to come, save */
 250                 ni->ni_rxfragstamp = ticks;
 251                 ni->ni_rxfrag[0] = mfrag;
 252                 mfrag = NULL;
 253         }
 254         return mfrag;
 255 }
 256
 257 void
 258 ieee80211_deliver_data(struct ieee80211vap *vap,
 259         struct ieee80211_node *ni, struct mbuf *m)
 260 {
 261         struct ether_header *eh = mtod(m, struct ether_header *);
 262         struct ifnet *ifp = vap->iv_ifp;
 263
 264         /* clear driver/net80211 flags before passing up */
 265         m->m_flags &= ~(M_MCAST | M_BCAST);
 266         m_clrprotoflags(m);
 267
 268         /* NB: see hostap_deliver_data, this path doesn't handle hostap */
 269         KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
 270         /*
 271          * Do accounting.
 272          */
 273         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 274         IEEE80211_NODE_STAT(ni, rx_data);
 275         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 276         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 277                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
 278                         m->m_flags |= M_BCAST;
 279                 else
 280                         m->m_flags |= M_MCAST;
 281                 IEEE80211_NODE_STAT(ni, rx_mcast);
 282         } else
 283                 IEEE80211_NODE_STAT(ni, rx_ucast);
 284         m->m_pkthdr.rcvif = ifp;
 285
 286         if (ni->ni_vlan != 0) {
 287                 /* attach vlan tag */
 288                 m->m_pkthdr.ether_vtag = ni->ni_vlan;
 289                 m->m_flags |= M_VLANTAG;
 290         }
 291         ifp->if_input(ifp, m);
 292 }
 293
 294 struct mbuf *
 295 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
 296 {
 297         struct ieee80211_qosframe_addr4 wh;
 298         struct ether_header *eh;
 299         struct llc *llc;
 300
 301         KASSERT(hdrlen <= sizeof(wh),
 302             ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
 303
 304         if (m->m_len < hdrlen + sizeof(*llc) &&
 305             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
 306                 vap->iv_stats.is_rx_tooshort++;
 307                 /* XXX msg */
 308                 return NULL;
 309         }
 310         memcpy(&wh, mtod(m, caddr_t), hdrlen);
 311         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
 312         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
 313             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
 314             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
 315             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
 316             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
 317               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
 318                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
 319                 llc = NULL;
 320         } else {
 321                 m_adj(m, hdrlen - sizeof(*eh));
 322         }
 323         eh = mtod(m, struct ether_header *);
 324         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
 325         case IEEE80211_FC1_DIR_NODS:
 326                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
 327                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
 328                 break;
 329         case IEEE80211_FC1_DIR_TODS:
 330                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
 331                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
 332                 break;
 333         case IEEE80211_FC1_DIR_FROMDS:
 334                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
 335                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
 336                 break;
 337         case IEEE80211_FC1_DIR_DSTODS:
 338                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
 339                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
 340                 break;
 341         }
 342 #ifndef __NO_STRICT_ALIGNMENT
 343         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
 344                 m = ieee80211_realign(vap, m, sizeof(*eh));
 345                 if (m == NULL)
 346                         return NULL;
 347         }
 348 #endif /* !__NO_STRICT_ALIGNMENT */
 349         if (llc != NULL) {
 350                 eh = mtod(m, struct ether_header *);
 351                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
 352         }
 353         return m;
 354 }
 355
 356 /*
 357  * Decap a frame encapsulated in a fast-frame/A-MSDU.
 358  */
 359 struct mbuf *
 360 ieee80211_decap1(struct mbuf *m, int *framelen)
 361 {
 362 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
 363         struct ether_header *eh;
 364         struct llc *llc;
 365
 366         /*
 367          * The frame has an 802.3 header followed by an 802.2
 368          * LLC header.  The encapsulated frame length is in the
 369          * first header type field; save that and overwrite it
 370          * with the true type field found in the second.  Then
 371          * copy the 802.3 header up to where it belongs and
 372          * adjust the mbuf contents to remove the void.
 373          */
 374         if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
 375                 return NULL;
 376         eh = mtod(m, struct ether_header *);    /* 802.3 header is first */
 377         llc = (struct llc *)&eh[1];             /* 802.2 header follows */
 378         *framelen = ntohs(eh->ether_type)       /* encap'd frame size */
 379                   + sizeof(struct ether_header) - sizeof(struct llc);
 380         eh->ether_type = llc->llc_un.type_snap.ether_type;
 381         ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
 382                 sizeof(struct ether_header));
 383         m_adj(m, sizeof(struct llc));
 384         return m;
 385 #undef FF_LLC_SIZE
 386 }
 387
 388 /*
 389  * Install received rate set information in the node's state block.
 390  */
 391 int
 392 ieee80211_setup_rates(struct ieee80211_node *ni,
 393         const uint8_t *rates, const uint8_t *xrates, int flags)
 394 {
 395         struct ieee80211vap *vap = ni->ni_vap;
 396         struct ieee80211_rateset *rs = &ni->ni_rates;
 397
 398         memset(rs, 0, sizeof(*rs));
 399         rs->rs_nrates = rates[1];
 400         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
 401         if (xrates != NULL) {
 402                 uint8_t nxrates;
 403                 /*
 404                  * Tack on 11g extended supported rate element.
 405                  */
 406                 nxrates = xrates[1];
 407                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
 408                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
 409                         IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
 410                             "extended rate set too large; only using "
 411                             "%u of %u rates", nxrates, xrates[1]);
 412                         vap->iv_stats.is_rx_rstoobig++;
 413                 }
 414                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
 415                 rs->rs_nrates += nxrates;
 416         }
 417         return ieee80211_fix_rate(ni, rs, flags);
 418 }
 419
 420 /*
 421  * Send a management frame error response to the specified
 422  * station.  If ni is associated with the station then use
 423  * it; otherwise allocate a temporary node suitable for
 424  * transmitting the frame and then free the reference so
 425  * it will go away as soon as the frame has been transmitted.
 426  */
 427 void
 428 ieee80211_send_error(struct ieee80211_node *ni,
 429         const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
 430 {
 431         struct ieee80211vap *vap = ni->ni_vap;
 432         int istmp;
 433
 434         if (ni == vap->iv_bss) {
 435                 if (vap->iv_state != IEEE80211_S_RUN) {
 436                         /*
 437                          * XXX hack until we get rid of this routine.
 438                          * We can be called prior to the vap reaching
 439                          * run state under certain conditions in which
 440                          * case iv_bss->ni_chan will not be setup.
 441                          * Check for this explicitly and and just ignore
 442                          * the request.
 443                          */
 444                         return;
 445                 }
 446                 ni = ieee80211_tmp_node(vap, mac);
 447                 if (ni == NULL) {
 448                         /* XXX msg */
 449                         return;
 450                 }
 451                 istmp = 1;
 452         } else
 453                 istmp = 0;
 454         IEEE80211_SEND_MGMT(ni, subtype, arg);
 455         if (istmp)
 456                 ieee80211_free_node(ni);
 457 }
 458
 459 int
 460 ieee80211_alloc_challenge(struct ieee80211_node *ni)
 461 {
 462         if (ni->ni_challenge == NULL)
 463                 ni->ni_challenge = (uint32_t *)
 464                     IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
 465                       M_80211_NODE, IEEE80211_M_NOWAIT);
 466         if (ni->ni_challenge == NULL) {
 467                 IEEE80211_NOTE(ni->ni_vap,
 468                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
 469                     "%s", "shared key challenge alloc failed");
 470                 /* XXX statistic */
 471         }
 472         return (ni->ni_challenge != NULL);
 473 }
 474
 475 /*
 476  * Parse a Beacon or ProbeResponse frame and return the
 477  * useful information in an ieee80211_scanparams structure.
 478  * Status is set to 0 if no problems were found; otherwise
 479  * a bitmask of IEEE80211_BPARSE_* items is returned that
 480  * describes the problems detected.
 481  */
 482 int
 483 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
 484         struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
 485 {
 486         struct ieee80211vap *vap = ni->ni_vap;
 487         struct ieee80211com *ic = ni->ni_ic;
 488         struct ieee80211_frame *wh;
 489         uint8_t *frm, *efrm;
 490
 491         wh = mtod(m, struct ieee80211_frame *);
 492         frm = (uint8_t *)&wh[1];
 493         efrm = mtod(m, uint8_t *) + m->m_len;
 494         scan->status = 0;
 495         /*
 496          * beacon/probe response frame format
 497          *
 498          * XXX Update from 802.11-2012 - eg where HT is
 499          *      [8] time stamp
 500          *      [2] beacon interval
 501          *      [2] capability information
 502          *      [tlv] ssid
 503          *      [tlv] supported rates
 504          *      [tlv] country information
 505          *      [tlv] channel switch announcement (CSA)
 506          *      [tlv] parameter set (FH/DS)
 507          *      [tlv] erp information
 508          *      [tlv] extended supported rates
 509          *      [tlv] WME
 510          *      [tlv] WPA or RSN
 511          *      [tlv] HT capabilities
 512          *      [tlv] HT information
 513          *      [tlv] VHT capabilities
 514          *      [tlv] VHT information
 515          *      [tlv] Atheros capabilities
 516          *      [tlv] Mesh ID
 517          *      [tlv] Mesh Configuration
 518          */
 519         IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
 520             return (scan->status = IEEE80211_BPARSE_BADIELEN));
 521         memset(scan, 0, sizeof(*scan));
 522         scan->tstamp  = frm;                            frm += 8;
 523         scan->bintval = le16toh(*(uint16_t *)frm);      frm += 2;
 524         scan->capinfo = le16toh(*(uint16_t *)frm);      frm += 2;
 525         scan->bchan = ieee80211_chan2ieee(ic, rxchan);
 526         scan->chan = scan->bchan;
 527         scan->ies = frm;
 528         scan->ies_len = efrm - frm;
 529
 530         while (efrm - frm > 1) {
 531                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
 532                     return (scan->status = IEEE80211_BPARSE_BADIELEN));
 533                 switch (*frm) {
 534                 case IEEE80211_ELEMID_SSID:
 535                         scan->ssid = frm;
 536                         break;
 537                 case IEEE80211_ELEMID_RATES:
 538                         scan->rates = frm;
 539                         break;
 540                 case IEEE80211_ELEMID_COUNTRY:
 541                         scan->country = frm;
 542                         break;
 543                 case IEEE80211_ELEMID_CSA:
 544                         scan->csa = frm;
 545                         break;
 546                 case IEEE80211_ELEMID_QUIET:
 547                         scan->quiet = frm;
 548                         break;
 549                 case IEEE80211_ELEMID_FHPARMS:
 550                         if (ic->ic_phytype == IEEE80211_T_FH) {
 551                                 scan->fhdwell = le16dec(&frm[2]);
 552                                 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
 553                                 scan->fhindex = frm[6];
 554                         }
 555                         break;
 556                 case IEEE80211_ELEMID_DSPARMS:
 557                         /*
 558                          * XXX hack this since depending on phytype
 559                          * is problematic for multi-mode devices.
 560                          */
 561                         if (ic->ic_phytype != IEEE80211_T_FH)
 562                                 scan->chan = frm[2];
 563                         break;
 564                 case IEEE80211_ELEMID_TIM:
 565                         /* XXX ATIM? */
 566                         scan->tim = frm;
 567                         scan->timoff = frm - mtod(m, uint8_t *);
 568                         break;
 569                 case IEEE80211_ELEMID_IBSSPARMS:
 570                 case IEEE80211_ELEMID_CFPARMS:
 571                 case IEEE80211_ELEMID_PWRCNSTR:
 572                 case IEEE80211_ELEMID_BSSLOAD:
 573                 case IEEE80211_ELEMID_APCHANREP:
 574                         /* NB: avoid debugging complaints */
 575                         break;
 576                 case IEEE80211_ELEMID_XRATES:
 577                         scan->xrates = frm;
 578                         break;
 579                 case IEEE80211_ELEMID_ERP:
 580                         if (frm[1] != 1) {
 581                                 IEEE80211_DISCARD_IE(vap,
 582                                     IEEE80211_MSG_ELEMID, wh, "ERP",
 583                                     "bad len %u", frm[1]);
 584                                 vap->iv_stats.is_rx_elem_toobig++;
 585                                 break;
 586                         }
 587                         scan->erp = frm[2] | 0x100;
 588                         break;
 589                 case IEEE80211_ELEMID_HTCAP:
 590                         scan->htcap = frm;
 591                         break;
 592                 case IEEE80211_ELEMID_VHT_CAP:
 593                         scan->vhtcap = frm;
 594                         break;
 595                 case IEEE80211_ELEMID_VHT_OPMODE:
 596                         scan->vhtopmode = frm;
 597                         break;
 598                 case IEEE80211_ELEMID_RSN:
 599                         scan->rsn = frm;
 600                         break;
 601                 case IEEE80211_ELEMID_HTINFO:
 602                         scan->htinfo = frm;
 603                         break;
 604 #ifdef IEEE80211_SUPPORT_MESH
 605                 case IEEE80211_ELEMID_MESHID:
 606                         scan->meshid = frm;
 607                         break;
 608                 case IEEE80211_ELEMID_MESHCONF:
 609                         scan->meshconf = frm;
 610                         break;
 611 #endif
 612                 /* Extended capabilities; nothing handles it for now */
 613                 case IEEE80211_ELEMID_EXTCAP:
 614                         break;
 615                 case IEEE80211_ELEMID_VENDOR:
 616                         if (iswpaoui(frm))
 617                                 scan->wpa = frm;
 618                         else if (iswmeparam(frm) || iswmeinfo(frm))
 619                                 scan->wme = frm;
 620 #ifdef IEEE80211_SUPPORT_SUPERG
 621                         else if (isatherosoui(frm))
 622                                 scan->ath = frm;
 623 #endif
 624 #ifdef IEEE80211_SUPPORT_TDMA
 625                         else if (istdmaoui(frm))
 626                                 scan->tdma = frm;
 627 #endif
 628                         else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
 629                                 /*
 630                                  * Accept pre-draft HT ie's if the
 631                                  * standard ones have not been seen.
 632                                  */
 633                                 if (ishtcapoui(frm)) {
 634                                         if (scan->htcap == NULL)
 635                                                 scan->htcap = frm;
 636                                 } else if (ishtinfooui(frm)) {
 637                                         if (scan->htinfo == NULL)
 638                                                 scan->htcap = frm;
 639                                 }
 640                         }
 641                         break;
 642                 default:
 643                         IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
 644                             wh, "unhandled",
 645                             "id %u, len %u", *frm, frm[1]);
 646                         vap->iv_stats.is_rx_elem_unknown++;
 647                         break;
 648                 }
 649                 frm += frm[1] + 2;
 650         }
 651         IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
 652             scan->status |= IEEE80211_BPARSE_RATES_INVALID);
 653         if (scan->rates != NULL && scan->xrates != NULL) {
 654                 /*
 655                  * NB: don't process XRATES if RATES is missing.  This
 656                  * avoids a potential null ptr deref and should be ok
 657                  * as the return code will already note RATES is missing
 658                  * (so callers shouldn't otherwise process the frame).
 659                  */
 660                 IEEE80211_VERIFY_ELEMENT(scan->xrates,
 661                     IEEE80211_RATE_MAXSIZE - scan->rates[1],
 662                     scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
 663         }
 664         IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
 665             scan->status |= IEEE80211_BPARSE_SSID_INVALID);
 666         if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
 667                 /*
 668                  * Frame was received on a channel different from the
 669                  * one indicated in the DS params element id;
 670                  * silently discard it.
 671                  *
 672                  * NB: this can happen due to signal leakage.
 673                  *     But we should take it for FH phy because
 674                  *     the rssi value should be correct even for
 675                  *     different hop pattern in FH.
 676                  */
 677                 IEEE80211_DISCARD(vap,
 678                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 679                     wh, NULL, "for off-channel %u (bchan=%u)",
 680                     scan->chan, scan->bchan);
 681                 vap->iv_stats.is_rx_chanmismatch++;
 682                 scan->status |= IEEE80211_BPARSE_OFFCHAN;
 683         }
 684         if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
 685               scan->bintval <= IEEE80211_BINTVAL_MAX)) {
 686                 IEEE80211_DISCARD(vap,
 687                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 688                     wh, NULL, "bogus beacon interval (%d TU)",
 689                     (int) scan->bintval);
 690                 vap->iv_stats.is_rx_badbintval++;
 691                 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
 692         }
 693         if (scan->country != NULL) {
 694                 /*
 695                  * Validate we have at least enough data to extract
 696                  * the country code.  Not sure if we should return an
 697                  * error instead of discarding the IE; consider this
 698                  * being lenient as we don't depend on the data for
 699                  * correct operation.
 700                  */
 701                 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
 702                     scan->country = NULL);
 703         }
 704         if (scan->csa != NULL) {
 705                 /*
 706                  * Validate Channel Switch Announcement; this must
 707                  * be the correct length or we toss the frame.
 708                  */
 709                 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
 710                     scan->status |= IEEE80211_BPARSE_CSA_INVALID);
 711         }
 712         /*
 713          * Process HT ie's.  This is complicated by our
 714          * accepting both the standard ie's and the pre-draft
 715          * vendor OUI ie's that some vendors still use/require.
 716          */
 717         if (scan->htcap != NULL) {
 718                 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
 719                      scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
 720                          4 + sizeof(struct ieee80211_ie_htcap)-2 :
 721                          sizeof(struct ieee80211_ie_htcap)-2,
 722                      scan->htcap = NULL);
 723         }
 724         if (scan->htinfo != NULL) {
 725                 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
 726                      scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
 727                          4 + sizeof(struct ieee80211_ie_htinfo)-2 :
 728                          sizeof(struct ieee80211_ie_htinfo)-2,
 729                      scan->htinfo = NULL);
 730         }
 731
 732         /* Process VHT IEs */
 733         if (scan->vhtcap != NULL) {
 734                 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
 735                     sizeof(struct ieee80211_ie_vhtcap) - 2,
 736                     scan->vhtcap = NULL);
 737         }
 738         if (scan->vhtopmode != NULL) {
 739                 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
 740                     sizeof(struct ieee80211_ie_vht_operation) - 2,
 741                     scan->vhtopmode = NULL);
 742         }
 743
 744         return scan->status;
 745 }
 746
 747 /*
 748  * Parse an Action frame.  Return 0 on success, non-zero on failure.
 749  */
 750 int
 751 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
 752 {
 753         struct ieee80211vap *vap = ni->ni_vap;
 754         const struct ieee80211_action *ia;
 755         struct ieee80211_frame *wh;
 756         uint8_t *frm, *efrm;
 757
 758         /*
 759          * action frame format:
 760          *      [1] category
 761          *      [1] action
 762          *      [tlv] parameters
 763          */
 764         wh = mtod(m, struct ieee80211_frame *);
 765         frm = (u_int8_t *)&wh[1];
 766         efrm = mtod(m, u_int8_t *) + m->m_len;
 767         IEEE80211_VERIFY_LENGTH(efrm - frm,
 768                 sizeof(struct ieee80211_action), return EINVAL);
 769         ia = (const struct ieee80211_action *) frm;
 770
 771         vap->iv_stats.is_rx_action++;
 772         IEEE80211_NODE_STAT(ni, rx_action);
 773
 774         /* verify frame payloads but defer processing */
 775         switch (ia->ia_category) {
 776         case IEEE80211_ACTION_CAT_BA:
 777                 switch (ia->ia_action) {
 778                 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 779                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 780                             sizeof(struct ieee80211_action_ba_addbarequest),
 781                             return EINVAL);
 782                         break;
 783                 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 784                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 785                             sizeof(struct ieee80211_action_ba_addbaresponse),
 786                             return EINVAL);
 787                         break;
 788                 case IEEE80211_ACTION_BA_DELBA:
 789                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 790                             sizeof(struct ieee80211_action_ba_delba),
 791                             return EINVAL);
 792                         break;
 793                 }
 794                 break;
 795         case IEEE80211_ACTION_CAT_HT:
 796                 switch (ia->ia_action) {
 797                 case IEEE80211_ACTION_HT_TXCHWIDTH:
 798                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 799                             sizeof(struct ieee80211_action_ht_txchwidth),
 800                             return EINVAL);
 801                         break;
 802                 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
 803                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 804                             sizeof(struct ieee80211_action_ht_mimopowersave),
 805                             return EINVAL);
 806                         break;
 807                 }
 808                 break;
 809 #ifdef IEEE80211_SUPPORT_MESH
 810         case IEEE80211_ACTION_CAT_MESH:
 811                 switch (ia->ia_action) {
 812                 case IEEE80211_ACTION_MESH_LMETRIC:
 813                         /*
 814                          * XXX: verification is true only if we are using
 815                          * Airtime link metric (default)
 816                          */
 817                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 818                             sizeof(struct ieee80211_meshlmetric_ie),
 819                             return EINVAL);
 820                         break;
 821                 case IEEE80211_ACTION_MESH_HWMP:
 822                         /* verify something */
 823                         break;
 824                 case IEEE80211_ACTION_MESH_GANN:
 825                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 826                             sizeof(struct ieee80211_meshgann_ie),
 827                             return EINVAL);
 828                         break;
 829                 case IEEE80211_ACTION_MESH_CC:
 830                 case IEEE80211_ACTION_MESH_MCCA_SREQ:
 831                 case IEEE80211_ACTION_MESH_MCCA_SREP:
 832                 case IEEE80211_ACTION_MESH_MCCA_AREQ:
 833                 case IEEE80211_ACTION_MESH_MCCA_ADVER:
 834                 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
 835                 case IEEE80211_ACTION_MESH_TBTT_REQ:
 836                 case IEEE80211_ACTION_MESH_TBTT_RES:
 837                         /* reject these early on, not implemented */
 838                         IEEE80211_DISCARD(vap,
 839                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 840                             wh, NULL, "not implemented yet, act=0x%02X",
 841                             ia->ia_action);
 842                         return EINVAL;
 843                 }
 844                 break;
 845         case IEEE80211_ACTION_CAT_SELF_PROT:
 846                 /* If TA or RA group address discard silently */
 847                 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
 848                         IEEE80211_IS_MULTICAST(wh->i_addr2))
 849                         return EINVAL;
 850                 /*
 851                  * XXX: Should we verify complete length now or it is
 852                  * to varying in sizes?
 853                  */
 854                 switch (ia->ia_action) {
 855                 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
 856                 case IEEE80211_ACTION_MESHPEERING_CLOSE:
 857                         /* is not a peering candidate (yet) */
 858                         if (ni == vap->iv_bss)
 859                                 return EINVAL;
 860                         break;
 861                 }
 862                 break;
 863 #endif
 864         case IEEE80211_ACTION_CAT_VHT:
 865                 printf("%s: TODO: VHT handling!\n", __func__);
 866                 break;
 867         }
 868         return 0;
 869 }
 870
 871 #ifdef IEEE80211_DEBUG
 872 /*
 873  * Debugging support.
 874  */
 875 void
 876 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
 877         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
 878 {
 879         printf("[%s] discard %s frame, ssid mismatch: ",
 880                 ether_sprintf(mac), tag);
 881         ieee80211_print_essid(ssid + 2, ssid[1]);
 882         printf("\n");
 883 }
 884
 885 /*
 886  * Return the bssid of a frame.
 887  */
 888 static const uint8_t *
 889 ieee80211_getbssid(const struct ieee80211vap *vap,
 890         const struct ieee80211_frame *wh)
 891 {
 892         if (vap->iv_opmode == IEEE80211_M_STA)
 893                 return wh->i_addr2;
 894         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
 895                 return wh->i_addr1;
 896         if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
 897                 return wh->i_addr1;
 898         return wh->i_addr3;
 899 }
 900
 901 #include <machine/stdarg.h>
 902
 903 void
 904 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
 905 {
 906         char buf[128];          /* XXX */
 907         va_list ap;
 908
 909         va_start(ap, fmt);
 910         vsnprintf(buf, sizeof(buf), fmt, ap);
 911         va_end(ap);
 912
 913         if_printf(vap->iv_ifp, "%s", buf);      /* NB: no \n */
 914 }
 915
 916 void
 917 ieee80211_note_frame(const struct ieee80211vap *vap,
 918         const struct ieee80211_frame *wh,
 919         const char *fmt, ...)
 920 {
 921         char buf[128];          /* XXX */
 922         va_list ap;
 923
 924         va_start(ap, fmt);
 925         vsnprintf(buf, sizeof(buf), fmt, ap);
 926         va_end(ap);
 927         if_printf(vap->iv_ifp, "[%s] %s\n",
 928                 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
 929 }
 930
 931 void
 932 ieee80211_note_mac(const struct ieee80211vap *vap,
 933         const uint8_t mac[IEEE80211_ADDR_LEN],
 934         const char *fmt, ...)
 935 {
 936         char buf[128];          /* XXX */
 937         va_list ap;
 938
 939         va_start(ap, fmt);
 940         vsnprintf(buf, sizeof(buf), fmt, ap);
 941         va_end(ap);
 942         if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
 943 }
 944
 945 void
 946 ieee80211_discard_frame(const struct ieee80211vap *vap,
 947         const struct ieee80211_frame *wh,
 948         const char *type, const char *fmt, ...)
 949 {
 950         va_list ap;
 951
 952         if_printf(vap->iv_ifp, "[%s] discard ",
 953                 ether_sprintf(ieee80211_getbssid(vap, wh)));
 954         printf("%s frame, ", type != NULL ? type :
 955             ieee80211_mgt_subtype_name(wh->i_fc[0]));
 956         va_start(ap, fmt);
 957         vprintf(fmt, ap);
 958         va_end(ap);
 959         printf("\n");
 960 }
 961
 962 void
 963 ieee80211_discard_ie(const struct ieee80211vap *vap,
 964         const struct ieee80211_frame *wh,
 965         const char *type, const char *fmt, ...)
 966 {
 967         va_list ap;
 968
 969         if_printf(vap->iv_ifp, "[%s] discard ",
 970                 ether_sprintf(ieee80211_getbssid(vap, wh)));
 971         if (type != NULL)
 972                 printf("%s information element, ", type);
 973         else
 974                 printf("information element, ");
 975         va_start(ap, fmt);
 976         vprintf(fmt, ap);
 977         va_end(ap);
 978         printf("\n");
 979 }
 980
 981 void
 982 ieee80211_discard_mac(const struct ieee80211vap *vap,
 983         const uint8_t mac[IEEE80211_ADDR_LEN],
 984         const char *type, const char *fmt, ...)
 985 {
 986         va_list ap;
 987
 988         if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
 989         if (type != NULL)
 990                 printf("%s frame, ", type);
 991         else
 992                 printf("frame, ");
 993         va_start(ap, fmt);
 994         vprintf(fmt, ap);
 995         va_end(ap);
 996         printf("\n");
 997 }
 998 #endif /* IEEE80211_DEBUG */