sys/net80211/ieee80211_input.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   3  *
   4  * Copyright (c) 2001 Atsushi Onoe
   5  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include "opt_wlan.h"
  33
  34 #include <sys/param.h>
  35 #include <sys/systm.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/malloc.h>
  38 #include <sys/endian.h>
  39 #include <sys/kernel.h>
  40
  41 #include <sys/socket.h>
  42
  43 #include <net/ethernet.h>
  44 #include <net/if.h>
  45 #include <net/if_var.h>
  46 #include <net/if_llc.h>
  47 #include <net/if_media.h>
  48 #include <net/if_vlan_var.h>
  49
  50 #include <net80211/ieee80211_var.h>
  51 #include <net80211/ieee80211_input.h>
  52 #ifdef IEEE80211_SUPPORT_MESH
  53 #include <net80211/ieee80211_mesh.h>
  54 #endif
  55
  56 #include <net/bpf.h>
  57
  58 #ifdef INET
  59 #include <netinet/in.h>
  60 #include <net/ethernet.h>
  61 #endif
  62
  63 static void
  64 ieee80211_process_mimo(struct ieee80211_node *ni, struct ieee80211_rx_stats *rx)
  65 {
  66         int i;
  67
  68         /* Verify the required MIMO bits are set */
  69         if ((rx->r_flags & (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI)) !=
  70             (IEEE80211_R_C_CHAIN | IEEE80211_R_C_NF | IEEE80211_R_C_RSSI))
  71                 return;
  72
  73         /* XXX This assumes the MIMO radios have both ctl and ext chains */
  74         for (i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
  75                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ctl[i], rx->c_rssi_ctl[i]);
  76                 IEEE80211_RSSI_LPF(ni->ni_mimo_rssi_ext[i], rx->c_rssi_ext[i]);
  77         }
  78
  79         /* XXX This also assumes the MIMO radios have both ctl and ext chains */
  80         for(i = 0; i < MIN(rx->c_chain, IEEE80211_MAX_CHAINS); i++) {
  81                 ni->ni_mimo_noise_ctl[i] = rx->c_nf_ctl[i];
  82                 ni->ni_mimo_noise_ext[i] = rx->c_nf_ext[i];
  83         }
  84         ni->ni_mimo_chains = rx->c_chain;
  85 }
  86
  87 int
  88 ieee80211_input_mimo(struct ieee80211_node *ni, struct mbuf *m)
  89 {
  90         struct ieee80211_rx_stats rxs;
  91
  92         /* try to read stats from mbuf */
  93         bzero(&rxs, sizeof(rxs));
  94         if (ieee80211_get_rx_params(m, &rxs) != 0)
  95                 return (-1);
  96
  97         /* XXX should assert IEEE80211_R_NF and IEEE80211_R_RSSI are set */
  98         ieee80211_process_mimo(ni, &rxs);
  99
 100         //return ieee80211_input(ni, m, rx->rssi, rx->nf);
 101         return ni->ni_vap->iv_input(ni, m, &rxs, rxs.c_rssi, rxs.c_nf);
 102 }
 103
 104 int
 105 ieee80211_input_all(struct ieee80211com *ic, struct mbuf *m, int rssi, int nf)
 106 {
 107         struct ieee80211_rx_stats rx;
 108
 109         rx.r_flags = IEEE80211_R_NF | IEEE80211_R_RSSI;
 110         rx.c_nf = nf;
 111         rx.c_rssi = rssi;
 112
 113         if (!ieee80211_add_rx_params(m, &rx))
 114                 return (-1);
 115
 116         return ieee80211_input_mimo_all(ic, m);
 117 }
 118
 119 int
 120 ieee80211_input_mimo_all(struct ieee80211com *ic, struct mbuf *m)
 121 {
 122         struct ieee80211vap *vap;
 123         int type = -1;
 124
 125         m->m_flags |= M_BCAST;          /* NB: mark for bpf tap'ing */
 126
 127         /* XXX locking */
 128         TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
 129                 struct ieee80211_node *ni;
 130                 struct mbuf *mcopy;
 131
 132                 /* NB: could check for IFF_UP but this is cheaper */
 133                 if (vap->iv_state == IEEE80211_S_INIT)
 134                         continue;
 135                 /*
 136                  * WDS vap's only receive directed traffic from the
 137                  * station at the ``far end''.  That traffic should
 138                  * be passed through the AP vap the station is associated
 139                  * to--so don't spam them with mcast frames.
 140                  */
 141                 if (vap->iv_opmode == IEEE80211_M_WDS)
 142                         continue;
 143                 if (TAILQ_NEXT(vap, iv_next) != NULL) {
 144                         /*
 145                          * Packet contents are changed by ieee80211_decap
 146                          * so do a deep copy of the packet.
 147                          * NB: tags are copied too.
 148                          */
 149                         mcopy = m_dup(m, M_NOWAIT);
 150                         if (mcopy == NULL) {
 151                                 /* XXX stat+msg */
 152                                 continue;
 153                         }
 154                 } else {
 155                         mcopy = m;
 156                         m = NULL;
 157                 }
 158                 ni = ieee80211_ref_node(vap->iv_bss);
 159                 type = ieee80211_input_mimo(ni, mcopy);
 160                 ieee80211_free_node(ni);
 161         }
 162         if (m != NULL)                  /* no vaps, reclaim mbuf */
 163                 m_freem(m);
 164         return type;
 165 }
 166
 167 /*
 168  * This function reassembles fragments.
 169  *
 170  * XXX should handle 3 concurrent reassemblies per-spec.
 171  */
 172 struct mbuf *
 173 ieee80211_defrag(struct ieee80211_node *ni, struct mbuf *m, int hdrspace)
 174 {
 175         struct ieee80211vap *vap = ni->ni_vap;
 176         struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
 177         struct ieee80211_frame *lwh;
 178         uint16_t rxseq;
 179         uint8_t fragno;
 180         uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG;
 181         struct mbuf *mfrag;
 182
 183         KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?"));
 184
 185         rxseq = le16toh(*(uint16_t *)wh->i_seq);
 186         fragno = rxseq & IEEE80211_SEQ_FRAG_MASK;
 187
 188         /* Quick way out, if there's nothing to defragment */
 189         if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL)
 190                 return m;
 191
 192         /*
 193          * Remove frag to insure it doesn't get reaped by timer.
 194          */
 195         if (ni->ni_table == NULL) {
 196                 /*
 197                  * Should never happen.  If the node is orphaned (not in
 198                  * the table) then input packets should not reach here.
 199                  * Otherwise, a concurrent request that yanks the table
 200                  * should be blocked by other interlocking and/or by first
 201                  * shutting the driver down.  Regardless, be defensive
 202                  * here and just bail
 203                  */
 204                 /* XXX need msg+stat */
 205                 m_freem(m);
 206                 return NULL;
 207         }
 208         IEEE80211_NODE_LOCK(ni->ni_table);
 209         mfrag = ni->ni_rxfrag[0];
 210         ni->ni_rxfrag[0] = NULL;
 211         IEEE80211_NODE_UNLOCK(ni->ni_table);
 212
 213         /*
 214          * Validate new fragment is in order and
 215          * related to the previous ones.
 216          */
 217         if (mfrag != NULL) {
 218                 uint16_t last_rxseq;
 219
 220                 lwh = mtod(mfrag, struct ieee80211_frame *);
 221                 last_rxseq = le16toh(*(uint16_t *)lwh->i_seq);
 222                 /* NB: check seq # and frag together */
 223                 if (rxseq == last_rxseq+1 &&
 224                     IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) &&
 225                     IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) {
 226                         /* XXX clear MORE_FRAG bit? */
 227                         /* track last seqnum and fragno */
 228                         *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq;
 229
 230                         m_adj(m, hdrspace);             /* strip header */
 231                         m_catpkt(mfrag, m);             /* concatenate */
 232                 } else {
 233                         /*
 234                          * Unrelated fragment or no space for it,
 235                          * clear current fragments.
 236                          */
 237                         m_freem(mfrag);
 238                         mfrag = NULL;
 239                 }
 240         }
 241
 242         if (mfrag == NULL) {
 243                 if (fragno != 0) {              /* !first fragment, discard */
 244                         vap->iv_stats.is_rx_defrag++;
 245                         IEEE80211_NODE_STAT(ni, rx_defrag);
 246                         m_freem(m);
 247                         return NULL;
 248                 }
 249                 mfrag = m;
 250         }
 251         if (more_frag) {                        /* more to come, save */
 252                 ni->ni_rxfragstamp = ticks;
 253                 ni->ni_rxfrag[0] = mfrag;
 254                 mfrag = NULL;
 255         }
 256         return mfrag;
 257 }
 258
 259 void
 260 ieee80211_deliver_data(struct ieee80211vap *vap,
 261         struct ieee80211_node *ni, struct mbuf *m)
 262 {
 263         struct ether_header *eh = mtod(m, struct ether_header *);
 264         struct ifnet *ifp = vap->iv_ifp;
 265
 266         /* clear driver/net80211 flags before passing up */
 267         m->m_flags &= ~(M_MCAST | M_BCAST);
 268         m_clrprotoflags(m);
 269
 270         /* NB: see hostap_deliver_data, this path doesn't handle hostap */
 271         KASSERT(vap->iv_opmode != IEEE80211_M_HOSTAP, ("gack, hostap"));
 272         /*
 273          * Do accounting.
 274          */
 275         if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
 276         IEEE80211_NODE_STAT(ni, rx_data);
 277         IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len);
 278         if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
 279                 if (ETHER_IS_BROADCAST(eh->ether_dhost))
 280                         m->m_flags |= M_BCAST;
 281                 else
 282                         m->m_flags |= M_MCAST;
 283                 IEEE80211_NODE_STAT(ni, rx_mcast);
 284         } else
 285                 IEEE80211_NODE_STAT(ni, rx_ucast);
 286         m->m_pkthdr.rcvif = ifp;
 287
 288         if (ni->ni_vlan != 0) {
 289                 /* attach vlan tag */
 290                 m->m_pkthdr.ether_vtag = ni->ni_vlan;
 291                 m->m_flags |= M_VLANTAG;
 292         }
 293         ifp->if_input(ifp, m);
 294 }
 295
 296 struct mbuf *
 297 ieee80211_decap(struct ieee80211vap *vap, struct mbuf *m, int hdrlen)
 298 {
 299         struct ieee80211_qosframe_addr4 wh;
 300         struct ether_header *eh;
 301         struct llc *llc;
 302
 303         KASSERT(hdrlen <= sizeof(wh),
 304             ("hdrlen %d > max %zd", hdrlen, sizeof(wh)));
 305
 306         if (m->m_len < hdrlen + sizeof(*llc) &&
 307             (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) {
 308                 vap->iv_stats.is_rx_tooshort++;
 309                 /* XXX msg */
 310                 return NULL;
 311         }
 312         memcpy(&wh, mtod(m, caddr_t), hdrlen);
 313         llc = (struct llc *)(mtod(m, caddr_t) + hdrlen);
 314         if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP &&
 315             llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 &&
 316             llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0 &&
 317             /* NB: preserve AppleTalk frames that have a native SNAP hdr */
 318             !(llc->llc_snap.ether_type == htons(ETHERTYPE_AARP) ||
 319               llc->llc_snap.ether_type == htons(ETHERTYPE_IPX))) {
 320                 m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh));
 321                 llc = NULL;
 322         } else {
 323                 m_adj(m, hdrlen - sizeof(*eh));
 324         }
 325         eh = mtod(m, struct ether_header *);
 326         switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) {
 327         case IEEE80211_FC1_DIR_NODS:
 328                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
 329                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
 330                 break;
 331         case IEEE80211_FC1_DIR_TODS:
 332                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
 333                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2);
 334                 break;
 335         case IEEE80211_FC1_DIR_FROMDS:
 336                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1);
 337                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3);
 338                 break;
 339         case IEEE80211_FC1_DIR_DSTODS:
 340                 IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3);
 341                 IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4);
 342                 break;
 343         }
 344 #ifndef __NO_STRICT_ALIGNMENT
 345         if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_t)) {
 346                 m = ieee80211_realign(vap, m, sizeof(*eh));
 347                 if (m == NULL)
 348                         return NULL;
 349         }
 350 #endif /* !__NO_STRICT_ALIGNMENT */
 351         if (llc != NULL) {
 352                 eh = mtod(m, struct ether_header *);
 353                 eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh));
 354         }
 355         return m;
 356 }
 357
 358 /*
 359  * Decap a frame encapsulated in a fast-frame/A-MSDU.
 360  */
 361 struct mbuf *
 362 ieee80211_decap1(struct mbuf *m, int *framelen)
 363 {
 364 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
 365         struct ether_header *eh;
 366         struct llc *llc;
 367
 368         /*
 369          * The frame has an 802.3 header followed by an 802.2
 370          * LLC header.  The encapsulated frame length is in the
 371          * first header type field; save that and overwrite it
 372          * with the true type field found in the second.  Then
 373          * copy the 802.3 header up to where it belongs and
 374          * adjust the mbuf contents to remove the void.
 375          */
 376         if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL)
 377                 return NULL;
 378         eh = mtod(m, struct ether_header *);    /* 802.3 header is first */
 379         llc = (struct llc *)&eh[1];             /* 802.2 header follows */
 380         *framelen = ntohs(eh->ether_type)       /* encap'd frame size */
 381                   + sizeof(struct ether_header) - sizeof(struct llc);
 382         eh->ether_type = llc->llc_un.type_snap.ether_type;
 383         ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc),
 384                 sizeof(struct ether_header));
 385         m_adj(m, sizeof(struct llc));
 386         return m;
 387 #undef FF_LLC_SIZE
 388 }
 389
 390 /*
 391  * Install received rate set information in the node's state block.
 392  */
 393 int
 394 ieee80211_setup_rates(struct ieee80211_node *ni,
 395         const uint8_t *rates, const uint8_t *xrates, int flags)
 396 {
 397         struct ieee80211vap *vap = ni->ni_vap;
 398         struct ieee80211_rateset *rs = &ni->ni_rates;
 399
 400         memset(rs, 0, sizeof(*rs));
 401         rs->rs_nrates = rates[1];
 402         memcpy(rs->rs_rates, rates + 2, rs->rs_nrates);
 403         if (xrates != NULL) {
 404                 uint8_t nxrates;
 405                 /*
 406                  * Tack on 11g extended supported rate element.
 407                  */
 408                 nxrates = xrates[1];
 409                 if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) {
 410                         nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates;
 411                         IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE, ni,
 412                             "extended rate set too large; only using "
 413                             "%u of %u rates", nxrates, xrates[1]);
 414                         vap->iv_stats.is_rx_rstoobig++;
 415                 }
 416                 memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates);
 417                 rs->rs_nrates += nxrates;
 418         }
 419         return ieee80211_fix_rate(ni, rs, flags);
 420 }
 421
 422 /*
 423  * Send a management frame error response to the specified
 424  * station.  If ni is associated with the station then use
 425  * it; otherwise allocate a temporary node suitable for
 426  * transmitting the frame and then free the reference so
 427  * it will go away as soon as the frame has been transmitted.
 428  */
 429 void
 430 ieee80211_send_error(struct ieee80211_node *ni,
 431         const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg)
 432 {
 433         struct ieee80211vap *vap = ni->ni_vap;
 434         int istmp;
 435
 436         if (ni == vap->iv_bss) {
 437                 if (vap->iv_state != IEEE80211_S_RUN) {
 438                         /*
 439                          * XXX hack until we get rid of this routine.
 440                          * We can be called prior to the vap reaching
 441                          * run state under certain conditions in which
 442                          * case iv_bss->ni_chan will not be setup.
 443                          * Check for this explicitly and and just ignore
 444                          * the request.
 445                          */
 446                         return;
 447                 }
 448                 ni = ieee80211_tmp_node(vap, mac);
 449                 if (ni == NULL) {
 450                         /* XXX msg */
 451                         return;
 452                 }
 453                 istmp = 1;
 454         } else
 455                 istmp = 0;
 456         IEEE80211_SEND_MGMT(ni, subtype, arg);
 457         if (istmp)
 458                 ieee80211_free_node(ni);
 459 }
 460
 461 int
 462 ieee80211_alloc_challenge(struct ieee80211_node *ni)
 463 {
 464         if (ni->ni_challenge == NULL)
 465                 ni->ni_challenge = (uint32_t *)
 466                     IEEE80211_MALLOC(IEEE80211_CHALLENGE_LEN,
 467                       M_80211_NODE, IEEE80211_M_NOWAIT);
 468         if (ni->ni_challenge == NULL) {
 469                 IEEE80211_NOTE(ni->ni_vap,
 470                     IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ni,
 471                     "%s", "shared key challenge alloc failed");
 472                 /* XXX statistic */
 473         }
 474         return (ni->ni_challenge != NULL);
 475 }
 476
 477 /*
 478  * Parse a Beacon or ProbeResponse frame and return the
 479  * useful information in an ieee80211_scanparams structure.
 480  * Status is set to 0 if no problems were found; otherwise
 481  * a bitmask of IEEE80211_BPARSE_* items is returned that
 482  * describes the problems detected.
 483  */
 484 int
 485 ieee80211_parse_beacon(struct ieee80211_node *ni, struct mbuf *m,
 486         struct ieee80211_channel *rxchan, struct ieee80211_scanparams *scan)
 487 {
 488         struct ieee80211vap *vap = ni->ni_vap;
 489         struct ieee80211com *ic = ni->ni_ic;
 490         struct ieee80211_frame *wh;
 491         uint8_t *frm, *efrm;
 492
 493         wh = mtod(m, struct ieee80211_frame *);
 494         frm = (uint8_t *)&wh[1];
 495         efrm = mtod(m, uint8_t *) + m->m_len;
 496         scan->status = 0;
 497         /*
 498          * beacon/probe response frame format
 499          *
 500          * XXX Update from 802.11-2012 - eg where HT is
 501          *      [8] time stamp
 502          *      [2] beacon interval
 503          *      [2] capability information
 504          *      [tlv] ssid
 505          *      [tlv] supported rates
 506          *      [tlv] country information
 507          *      [tlv] channel switch announcement (CSA)
 508          *      [tlv] parameter set (FH/DS)
 509          *      [tlv] erp information
 510          *      [tlv] extended supported rates
 511          *      [tlv] WME
 512          *      [tlv] WPA or RSN
 513          *      [tlv] HT capabilities
 514          *      [tlv] HT information
 515          *      [tlv] VHT capabilities
 516          *      [tlv] VHT information
 517          *      [tlv] Atheros capabilities
 518          *      [tlv] Mesh ID
 519          *      [tlv] Mesh Configuration
 520          */
 521         IEEE80211_VERIFY_LENGTH(efrm - frm, 12,
 522             return (scan->status = IEEE80211_BPARSE_BADIELEN));
 523         memset(scan, 0, sizeof(*scan));
 524         scan->tstamp  = frm;                            frm += 8;
 525         scan->bintval = le16toh(*(uint16_t *)frm);      frm += 2;
 526         scan->capinfo = le16toh(*(uint16_t *)frm);      frm += 2;
 527         scan->bchan = ieee80211_chan2ieee(ic, rxchan);
 528         scan->chan = scan->bchan;
 529         scan->ies = frm;
 530         scan->ies_len = efrm - frm;
 531
 532         while (efrm - frm > 1) {
 533                 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2,
 534                     return (scan->status = IEEE80211_BPARSE_BADIELEN));
 535                 switch (*frm) {
 536                 case IEEE80211_ELEMID_SSID:
 537                         scan->ssid = frm;
 538                         break;
 539                 case IEEE80211_ELEMID_RATES:
 540                         scan->rates = frm;
 541                         break;
 542                 case IEEE80211_ELEMID_COUNTRY:
 543                         scan->country = frm;
 544                         break;
 545                 case IEEE80211_ELEMID_CSA:
 546                         scan->csa = frm;
 547                         break;
 548                 case IEEE80211_ELEMID_QUIET:
 549                         scan->quiet = frm;
 550                         break;
 551                 case IEEE80211_ELEMID_FHPARMS:
 552                         if (ic->ic_phytype == IEEE80211_T_FH) {
 553                                 scan->fhdwell = le16dec(&frm[2]);
 554                                 scan->chan = IEEE80211_FH_CHAN(frm[4], frm[5]);
 555                                 scan->fhindex = frm[6];
 556                         }
 557                         break;
 558                 case IEEE80211_ELEMID_DSPARMS:
 559                         /*
 560                          * XXX hack this since depending on phytype
 561                          * is problematic for multi-mode devices.
 562                          */
 563                         if (ic->ic_phytype != IEEE80211_T_FH)
 564                                 scan->chan = frm[2];
 565                         break;
 566                 case IEEE80211_ELEMID_TIM:
 567                         /* XXX ATIM? */
 568                         scan->tim = frm;
 569                         scan->timoff = frm - mtod(m, uint8_t *);
 570                         break;
 571                 case IEEE80211_ELEMID_IBSSPARMS:
 572                 case IEEE80211_ELEMID_CFPARMS:
 573                 case IEEE80211_ELEMID_PWRCNSTR:
 574                 case IEEE80211_ELEMID_BSSLOAD:
 575                 case IEEE80211_ELEMID_APCHANREP:
 576                         /* NB: avoid debugging complaints */
 577                         break;
 578                 case IEEE80211_ELEMID_XRATES:
 579                         scan->xrates = frm;
 580                         break;
 581                 case IEEE80211_ELEMID_ERP:
 582                         if (frm[1] != 1) {
 583                                 IEEE80211_DISCARD_IE(vap,
 584                                     IEEE80211_MSG_ELEMID, wh, "ERP",
 585                                     "bad len %u", frm[1]);
 586                                 vap->iv_stats.is_rx_elem_toobig++;
 587                                 break;
 588                         }
 589                         scan->erp = frm[2] | 0x100;
 590                         break;
 591                 case IEEE80211_ELEMID_HTCAP:
 592                         scan->htcap = frm;
 593                         break;
 594                 case IEEE80211_ELEMID_VHT_CAP:
 595                         scan->vhtcap = frm;
 596                         break;
 597                 case IEEE80211_ELEMID_VHT_OPMODE:
 598                         scan->vhtopmode = frm;
 599                         break;
 600                 case IEEE80211_ELEMID_RSN:
 601                         scan->rsn = frm;
 602                         break;
 603                 case IEEE80211_ELEMID_HTINFO:
 604                         scan->htinfo = frm;
 605                         break;
 606 #ifdef IEEE80211_SUPPORT_MESH
 607                 case IEEE80211_ELEMID_MESHID:
 608                         scan->meshid = frm;
 609                         break;
 610                 case IEEE80211_ELEMID_MESHCONF:
 611                         scan->meshconf = frm;
 612                         break;
 613 #endif
 614                 /* Extended capabilities; nothing handles it for now */
 615                 case IEEE80211_ELEMID_EXTCAP:
 616                         break;
 617                 case IEEE80211_ELEMID_VENDOR:
 618                         if (iswpaoui(frm))
 619                                 scan->wpa = frm;
 620                         else if (iswmeparam(frm) || iswmeinfo(frm))
 621                                 scan->wme = frm;
 622 #ifdef IEEE80211_SUPPORT_SUPERG
 623                         else if (isatherosoui(frm))
 624                                 scan->ath = frm;
 625 #endif
 626 #ifdef IEEE80211_SUPPORT_TDMA
 627                         else if (istdmaoui(frm))
 628                                 scan->tdma = frm;
 629 #endif
 630                         else if (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) {
 631                                 /*
 632                                  * Accept pre-draft HT ie's if the
 633                                  * standard ones have not been seen.
 634                                  */
 635                                 if (ishtcapoui(frm)) {
 636                                         if (scan->htcap == NULL)
 637                                                 scan->htcap = frm;
 638                                 } else if (ishtinfooui(frm)) {
 639                                         if (scan->htinfo == NULL)
 640                                                 scan->htcap = frm;
 641                                 }
 642                         }
 643                         break;
 644                 default:
 645                         IEEE80211_DISCARD_IE(vap, IEEE80211_MSG_ELEMID,
 646                             wh, "unhandled",
 647                             "id %u, len %u", *frm, frm[1]);
 648                         vap->iv_stats.is_rx_elem_unknown++;
 649                         break;
 650                 }
 651                 frm += frm[1] + 2;
 652         }
 653         IEEE80211_VERIFY_ELEMENT(scan->rates, IEEE80211_RATE_MAXSIZE,
 654             scan->status |= IEEE80211_BPARSE_RATES_INVALID);
 655         if (scan->rates != NULL && scan->xrates != NULL) {
 656                 /*
 657                  * NB: don't process XRATES if RATES is missing.  This
 658                  * avoids a potential null ptr deref and should be ok
 659                  * as the return code will already note RATES is missing
 660                  * (so callers shouldn't otherwise process the frame).
 661                  */
 662                 IEEE80211_VERIFY_ELEMENT(scan->xrates,
 663                     IEEE80211_RATE_MAXSIZE - scan->rates[1],
 664                     scan->status |= IEEE80211_BPARSE_XRATES_INVALID);
 665         }
 666         IEEE80211_VERIFY_ELEMENT(scan->ssid, IEEE80211_NWID_LEN,
 667             scan->status |= IEEE80211_BPARSE_SSID_INVALID);
 668         if (scan->chan != scan->bchan && ic->ic_phytype != IEEE80211_T_FH) {
 669                 /*
 670                  * Frame was received on a channel different from the
 671                  * one indicated in the DS params element id;
 672                  * silently discard it.
 673                  *
 674                  * NB: this can happen due to signal leakage.
 675                  *     But we should take it for FH phy because
 676                  *     the rssi value should be correct even for
 677                  *     different hop pattern in FH.
 678                  */
 679                 IEEE80211_DISCARD(vap,
 680                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 681                     wh, NULL, "for off-channel %u (bchan=%u)",
 682                     scan->chan, scan->bchan);
 683                 vap->iv_stats.is_rx_chanmismatch++;
 684                 scan->status |= IEEE80211_BPARSE_OFFCHAN;
 685         }
 686         if (!(IEEE80211_BINTVAL_MIN <= scan->bintval &&
 687               scan->bintval <= IEEE80211_BINTVAL_MAX)) {
 688                 IEEE80211_DISCARD(vap,
 689                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 690                     wh, NULL, "bogus beacon interval (%d TU)",
 691                     (int) scan->bintval);
 692                 vap->iv_stats.is_rx_badbintval++;
 693                 scan->status |= IEEE80211_BPARSE_BINTVAL_INVALID;
 694         }
 695         if (scan->country != NULL) {
 696                 /*
 697                  * Validate we have at least enough data to extract
 698                  * the country code.  Not sure if we should return an
 699                  * error instead of discarding the IE; consider this
 700                  * being lenient as we don't depend on the data for
 701                  * correct operation.
 702                  */
 703                 IEEE80211_VERIFY_LENGTH(scan->country[1], 3 * sizeof(uint8_t),
 704                     scan->country = NULL);
 705         }
 706         if (scan->csa != NULL) {
 707                 /*
 708                  * Validate Channel Switch Announcement; this must
 709                  * be the correct length or we toss the frame.
 710                  */
 711                 IEEE80211_VERIFY_LENGTH(scan->csa[1], 3 * sizeof(uint8_t),
 712                     scan->status |= IEEE80211_BPARSE_CSA_INVALID);
 713         }
 714         /*
 715          * Process HT ie's.  This is complicated by our
 716          * accepting both the standard ie's and the pre-draft
 717          * vendor OUI ie's that some vendors still use/require.
 718          */
 719         if (scan->htcap != NULL) {
 720                 IEEE80211_VERIFY_LENGTH(scan->htcap[1],
 721                      scan->htcap[0] == IEEE80211_ELEMID_VENDOR ?
 722                          4 + sizeof(struct ieee80211_ie_htcap)-2 :
 723                          sizeof(struct ieee80211_ie_htcap)-2,
 724                      scan->htcap = NULL);
 725         }
 726         if (scan->htinfo != NULL) {
 727                 IEEE80211_VERIFY_LENGTH(scan->htinfo[1],
 728                      scan->htinfo[0] == IEEE80211_ELEMID_VENDOR ?
 729                          4 + sizeof(struct ieee80211_ie_htinfo)-2 :
 730                          sizeof(struct ieee80211_ie_htinfo)-2,
 731                      scan->htinfo = NULL);
 732         }
 733
 734         /* Process VHT IEs */
 735         if (scan->vhtcap != NULL) {
 736                 IEEE80211_VERIFY_LENGTH(scan->vhtcap[1],
 737                     sizeof(struct ieee80211_ie_vhtcap) - 2,
 738                     scan->vhtcap = NULL);
 739         }
 740         if (scan->vhtopmode != NULL) {
 741                 IEEE80211_VERIFY_LENGTH(scan->vhtopmode[1],
 742                     sizeof(struct ieee80211_ie_vht_operation) - 2,
 743                     scan->vhtopmode = NULL);
 744         }
 745
 746         return scan->status;
 747 }
 748
 749 /*
 750  * Parse an Action frame.  Return 0 on success, non-zero on failure.
 751  */
 752 int
 753 ieee80211_parse_action(struct ieee80211_node *ni, struct mbuf *m)
 754 {
 755         struct ieee80211vap *vap = ni->ni_vap;
 756         const struct ieee80211_action *ia;
 757         struct ieee80211_frame *wh;
 758         uint8_t *frm, *efrm;
 759
 760         /*
 761          * action frame format:
 762          *      [1] category
 763          *      [1] action
 764          *      [tlv] parameters
 765          */
 766         wh = mtod(m, struct ieee80211_frame *);
 767         frm = (u_int8_t *)&wh[1];
 768         efrm = mtod(m, u_int8_t *) + m->m_len;
 769         IEEE80211_VERIFY_LENGTH(efrm - frm,
 770                 sizeof(struct ieee80211_action), return EINVAL);
 771         ia = (const struct ieee80211_action *) frm;
 772
 773         vap->iv_stats.is_rx_action++;
 774         IEEE80211_NODE_STAT(ni, rx_action);
 775
 776         /* verify frame payloads but defer processing */
 777         switch (ia->ia_category) {
 778         case IEEE80211_ACTION_CAT_BA:
 779                 switch (ia->ia_action) {
 780                 case IEEE80211_ACTION_BA_ADDBA_REQUEST:
 781                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 782                             sizeof(struct ieee80211_action_ba_addbarequest),
 783                             return EINVAL);
 784                         break;
 785                 case IEEE80211_ACTION_BA_ADDBA_RESPONSE:
 786                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 787                             sizeof(struct ieee80211_action_ba_addbaresponse),
 788                             return EINVAL);
 789                         break;
 790                 case IEEE80211_ACTION_BA_DELBA:
 791                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 792                             sizeof(struct ieee80211_action_ba_delba),
 793                             return EINVAL);
 794                         break;
 795                 }
 796                 break;
 797         case IEEE80211_ACTION_CAT_HT:
 798                 switch (ia->ia_action) {
 799                 case IEEE80211_ACTION_HT_TXCHWIDTH:
 800                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 801                             sizeof(struct ieee80211_action_ht_txchwidth),
 802                             return EINVAL);
 803                         break;
 804                 case IEEE80211_ACTION_HT_MIMOPWRSAVE:
 805                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 806                             sizeof(struct ieee80211_action_ht_mimopowersave),
 807                             return EINVAL);
 808                         break;
 809                 }
 810                 break;
 811 #ifdef IEEE80211_SUPPORT_MESH
 812         case IEEE80211_ACTION_CAT_MESH:
 813                 switch (ia->ia_action) {
 814                 case IEEE80211_ACTION_MESH_LMETRIC:
 815                         /*
 816                          * XXX: verification is true only if we are using
 817                          * Airtime link metric (default)
 818                          */
 819                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 820                             sizeof(struct ieee80211_meshlmetric_ie),
 821                             return EINVAL);
 822                         break;
 823                 case IEEE80211_ACTION_MESH_HWMP:
 824                         /* verify something */
 825                         break;
 826                 case IEEE80211_ACTION_MESH_GANN:
 827                         IEEE80211_VERIFY_LENGTH(efrm - frm,
 828                             sizeof(struct ieee80211_meshgann_ie),
 829                             return EINVAL);
 830                         break;
 831                 case IEEE80211_ACTION_MESH_CC:
 832                 case IEEE80211_ACTION_MESH_MCCA_SREQ:
 833                 case IEEE80211_ACTION_MESH_MCCA_SREP:
 834                 case IEEE80211_ACTION_MESH_MCCA_AREQ:
 835                 case IEEE80211_ACTION_MESH_MCCA_ADVER:
 836                 case IEEE80211_ACTION_MESH_MCCA_TRDOWN:
 837                 case IEEE80211_ACTION_MESH_TBTT_REQ:
 838                 case IEEE80211_ACTION_MESH_TBTT_RES:
 839                         /* reject these early on, not implemented */
 840                         IEEE80211_DISCARD(vap,
 841                             IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT,
 842                             wh, NULL, "not implemented yet, act=0x%02X",
 843                             ia->ia_action);
 844                         return EINVAL;
 845                 }
 846                 break;
 847         case IEEE80211_ACTION_CAT_SELF_PROT:
 848                 /* If TA or RA group address discard silently */
 849                 if (IEEE80211_IS_MULTICAST(wh->i_addr1) ||
 850                         IEEE80211_IS_MULTICAST(wh->i_addr2))
 851                         return EINVAL;
 852                 /*
 853                  * XXX: Should we verify complete length now or it is
 854                  * to varying in sizes?
 855                  */
 856                 switch (ia->ia_action) {
 857                 case IEEE80211_ACTION_MESHPEERING_CONFIRM:
 858                 case IEEE80211_ACTION_MESHPEERING_CLOSE:
 859                         /* is not a peering candidate (yet) */
 860                         if (ni == vap->iv_bss)
 861                                 return EINVAL;
 862                         break;
 863                 }
 864                 break;
 865 #endif
 866         case IEEE80211_ACTION_CAT_VHT:
 867                 printf("%s: TODO: VHT handling!\n", __func__);
 868                 break;
 869         }
 870         return 0;
 871 }
 872
 873 #ifdef IEEE80211_DEBUG
 874 /*
 875  * Debugging support.
 876  */
 877 void
 878 ieee80211_ssid_mismatch(struct ieee80211vap *vap, const char *tag,
 879         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid)
 880 {
 881         printf("[%s] discard %s frame, ssid mismatch: ",
 882                 ether_sprintf(mac), tag);
 883         ieee80211_print_essid(ssid + 2, ssid[1]);
 884         printf("\n");
 885 }
 886
 887 /*
 888  * Return the bssid of a frame.
 889  */
 890 static const uint8_t *
 891 ieee80211_getbssid(const struct ieee80211vap *vap,
 892         const struct ieee80211_frame *wh)
 893 {
 894         if (vap->iv_opmode == IEEE80211_M_STA)
 895                 return wh->i_addr2;
 896         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS)
 897                 return wh->i_addr1;
 898         if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL)
 899                 return wh->i_addr1;
 900         return wh->i_addr3;
 901 }
 902
 903 #include <machine/stdarg.h>
 904
 905 void
 906 ieee80211_note(const struct ieee80211vap *vap, const char *fmt, ...)
 907 {
 908         char buf[128];          /* XXX */
 909         va_list ap;
 910
 911         va_start(ap, fmt);
 912         vsnprintf(buf, sizeof(buf), fmt, ap);
 913         va_end(ap);
 914
 915         if_printf(vap->iv_ifp, "%s", buf);      /* NB: no \n */
 916 }
 917
 918 void
 919 ieee80211_note_frame(const struct ieee80211vap *vap,
 920         const struct ieee80211_frame *wh,
 921         const char *fmt, ...)
 922 {
 923         char buf[128];          /* XXX */
 924         va_list ap;
 925
 926         va_start(ap, fmt);
 927         vsnprintf(buf, sizeof(buf), fmt, ap);
 928         va_end(ap);
 929         if_printf(vap->iv_ifp, "[%s] %s\n",
 930                 ether_sprintf(ieee80211_getbssid(vap, wh)), buf);
 931 }
 932
 933 void
 934 ieee80211_note_mac(const struct ieee80211vap *vap,
 935         const uint8_t mac[IEEE80211_ADDR_LEN],
 936         const char *fmt, ...)
 937 {
 938         char buf[128];          /* XXX */
 939         va_list ap;
 940
 941         va_start(ap, fmt);
 942         vsnprintf(buf, sizeof(buf), fmt, ap);
 943         va_end(ap);
 944         if_printf(vap->iv_ifp, "[%s] %s\n", ether_sprintf(mac), buf);
 945 }
 946
 947 void
 948 ieee80211_discard_frame(const struct ieee80211vap *vap,
 949         const struct ieee80211_frame *wh,
 950         const char *type, const char *fmt, ...)
 951 {
 952         va_list ap;
 953
 954         if_printf(vap->iv_ifp, "[%s] discard ",
 955                 ether_sprintf(ieee80211_getbssid(vap, wh)));
 956         printf("%s frame, ", type != NULL ? type :
 957             ieee80211_mgt_subtype_name(wh->i_fc[0]));
 958         va_start(ap, fmt);
 959         vprintf(fmt, ap);
 960         va_end(ap);
 961         printf("\n");
 962 }
 963
 964 void
 965 ieee80211_discard_ie(const struct ieee80211vap *vap,
 966         const struct ieee80211_frame *wh,
 967         const char *type, const char *fmt, ...)
 968 {
 969         va_list ap;
 970
 971         if_printf(vap->iv_ifp, "[%s] discard ",
 972                 ether_sprintf(ieee80211_getbssid(vap, wh)));
 973         if (type != NULL)
 974                 printf("%s information element, ", type);
 975         else
 976                 printf("information element, ");
 977         va_start(ap, fmt);
 978         vprintf(fmt, ap);
 979         va_end(ap);
 980         printf("\n");
 981 }
 982
 983 void
 984 ieee80211_discard_mac(const struct ieee80211vap *vap,
 985         const uint8_t mac[IEEE80211_ADDR_LEN],
 986         const char *type, const char *fmt, ...)
 987 {
 988         va_list ap;
 989
 990         if_printf(vap->iv_ifp, "[%s] discard ", ether_sprintf(mac));
 991         if (type != NULL)
 992                 printf("%s frame, ", type);
 993         else
 994                 printf("frame, ");
 995         va_start(ap, fmt);
 996         vprintf(fmt, ap);
 997         va_end(ap);
 998         printf("\n");
 999 }
1000 #endif /* IEEE80211_DEBUG */