| 1 | /*- |
| 2 | * Copyright (c) 2007-2009 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 | * $FreeBSD: head/sys/net80211/ieee80211_adhoc.c 203422 2010-02-03 10:07:43Z rpaulo $ |
| 26 | * $DragonFly$ |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * IEEE 802.11 IBSS mode support. |
| 31 | */ |
| 32 | #include "opt_inet.h" |
| 33 | #include "opt_wlan.h" |
| 34 | |
| 35 | #include <sys/param.h> |
| 36 | #include <sys/systm.h> |
| 37 | #include <sys/mbuf.h> |
| 38 | #include <sys/malloc.h> |
| 39 | #include <sys/kernel.h> |
| 40 | |
| 41 | #include <sys/socket.h> |
| 42 | #include <sys/sockio.h> |
| 43 | #include <sys/endian.h> |
| 44 | #include <sys/errno.h> |
| 45 | #include <sys/proc.h> |
| 46 | #include <sys/sysctl.h> |
| 47 | |
| 48 | #include <net/if.h> |
| 49 | #include <net/if_media.h> |
| 50 | #include <net/if_llc.h> |
| 51 | #include <net/ethernet.h> |
| 52 | #include <net/route.h> |
| 53 | |
| 54 | #include <net/bpf.h> |
| 55 | |
| 56 | #include <netproto/802_11/ieee80211_var.h> |
| 57 | #include <netproto/802_11/ieee80211_adhoc.h> |
| 58 | #include <netproto/802_11/ieee80211_input.h> |
| 59 | #ifdef IEEE80211_SUPPORT_SUPERG |
| 60 | #include <netproto/802_11/ieee80211_superg.h> |
| 61 | #endif |
| 62 | #ifdef IEEE80211_SUPPORT_TDMA |
| 63 | #include <netproto/802_11/ieee80211_tdma.h> |
| 64 | #endif |
| 65 | |
| 66 | #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) |
| 67 | |
| 68 | static void adhoc_vattach(struct ieee80211vap *); |
| 69 | static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int); |
| 70 | static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int); |
| 71 | static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *, |
| 72 | int subtype, int, int); |
| 73 | static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *, |
| 74 | int subtype, int, int); |
| 75 | static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype); |
| 76 | |
| 77 | void |
| 78 | ieee80211_adhoc_attach(struct ieee80211com *ic) |
| 79 | { |
| 80 | ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach; |
| 81 | ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach; |
| 82 | } |
| 83 | |
| 84 | void |
| 85 | ieee80211_adhoc_detach(struct ieee80211com *ic) |
| 86 | { |
| 87 | } |
| 88 | |
| 89 | static void |
| 90 | adhoc_vdetach(struct ieee80211vap *vap) |
| 91 | { |
| 92 | } |
| 93 | |
| 94 | static void |
| 95 | adhoc_vattach(struct ieee80211vap *vap) |
| 96 | { |
| 97 | vap->iv_newstate = adhoc_newstate; |
| 98 | vap->iv_input = adhoc_input; |
| 99 | if (vap->iv_opmode == IEEE80211_M_IBSS) |
| 100 | vap->iv_recv_mgmt = adhoc_recv_mgmt; |
| 101 | else |
| 102 | vap->iv_recv_mgmt = ahdemo_recv_mgmt; |
| 103 | vap->iv_recv_ctl = adhoc_recv_ctl; |
| 104 | vap->iv_opdetach = adhoc_vdetach; |
| 105 | #ifdef IEEE80211_SUPPORT_TDMA |
| 106 | /* |
| 107 | * Throw control to tdma support. Note we do this |
| 108 | * after setting up our callbacks so it can piggyback |
| 109 | * on top of us. |
| 110 | */ |
| 111 | if (vap->iv_caps & IEEE80211_C_TDMA) |
| 112 | ieee80211_tdma_vattach(vap); |
| 113 | #endif |
| 114 | } |
| 115 | |
| 116 | static void |
| 117 | sta_leave(void *arg, struct ieee80211_node *ni) |
| 118 | { |
| 119 | struct ieee80211vap *vap = arg; |
| 120 | |
| 121 | if (ni->ni_vap == vap && ni != vap->iv_bss) |
| 122 | ieee80211_node_leave(ni); |
| 123 | } |
| 124 | |
| 125 | /* |
| 126 | * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler. |
| 127 | */ |
| 128 | static int |
| 129 | adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg) |
| 130 | { |
| 131 | struct ieee80211com *ic = vap->iv_ic; |
| 132 | struct ieee80211_node *ni; |
| 133 | enum ieee80211_state ostate; |
| 134 | |
| 135 | ostate = vap->iv_state; |
| 136 | IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n", |
| 137 | __func__, ieee80211_state_name[ostate], |
| 138 | ieee80211_state_name[nstate], arg); |
| 139 | vap->iv_state = nstate; /* state transition */ |
| 140 | if (ostate != IEEE80211_S_SCAN) |
| 141 | ieee80211_cancel_scan(vap); /* background scan */ |
| 142 | ni = vap->iv_bss; /* NB: no reference held */ |
| 143 | switch (nstate) { |
| 144 | case IEEE80211_S_INIT: |
| 145 | switch (ostate) { |
| 146 | case IEEE80211_S_SCAN: |
| 147 | ieee80211_cancel_scan(vap); |
| 148 | break; |
| 149 | default: |
| 150 | break; |
| 151 | } |
| 152 | if (ostate != IEEE80211_S_INIT) { |
| 153 | /* NB: optimize INIT -> INIT case */ |
| 154 | ieee80211_reset_bss(vap); |
| 155 | } |
| 156 | break; |
| 157 | case IEEE80211_S_SCAN: |
| 158 | switch (ostate) { |
| 159 | case IEEE80211_S_RUN: /* beacon miss */ |
| 160 | /* purge station table; entries are stale */ |
| 161 | ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap); |
| 162 | /* fall thru... */ |
| 163 | case IEEE80211_S_INIT: |
| 164 | if (vap->iv_des_chan != IEEE80211_CHAN_ANYC && |
| 165 | !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) { |
| 166 | /* |
| 167 | * Already have a channel; bypass the |
| 168 | * scan and startup immediately. |
| 169 | */ |
| 170 | ieee80211_create_ibss(vap, vap->iv_des_chan); |
| 171 | break; |
| 172 | } |
| 173 | /* |
| 174 | * Initiate a scan. We can come here as a result |
| 175 | * of an IEEE80211_IOC_SCAN_REQ too in which case |
| 176 | * the vap will be marked with IEEE80211_FEXT_SCANREQ |
| 177 | * and the scan request parameters will be present |
| 178 | * in iv_scanreq. Otherwise we do the default. |
| 179 | */ |
| 180 | if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) { |
| 181 | ieee80211_check_scan(vap, |
| 182 | vap->iv_scanreq_flags, |
| 183 | vap->iv_scanreq_duration, |
| 184 | vap->iv_scanreq_mindwell, |
| 185 | vap->iv_scanreq_maxdwell, |
| 186 | vap->iv_scanreq_nssid, vap->iv_scanreq_ssid); |
| 187 | vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ; |
| 188 | } else |
| 189 | ieee80211_check_scan_current(vap); |
| 190 | break; |
| 191 | case IEEE80211_S_SCAN: |
| 192 | /* |
| 193 | * This can happen because of a change in state |
| 194 | * that requires a reset. Trigger a new scan |
| 195 | * unless we're in manual roaming mode in which |
| 196 | * case an application must issue an explicit request. |
| 197 | */ |
| 198 | if (vap->iv_roaming == IEEE80211_ROAMING_AUTO) |
| 199 | ieee80211_check_scan_current(vap); |
| 200 | break; |
| 201 | default: |
| 202 | goto invalid; |
| 203 | } |
| 204 | break; |
| 205 | case IEEE80211_S_RUN: |
| 206 | if (vap->iv_flags & IEEE80211_F_WPA) { |
| 207 | /* XXX validate prerequisites */ |
| 208 | } |
| 209 | switch (ostate) { |
| 210 | case IEEE80211_S_SCAN: |
| 211 | #ifdef IEEE80211_DEBUG |
| 212 | if (ieee80211_msg_debug(vap)) { |
| 213 | ieee80211_note(vap, |
| 214 | "synchronized with %6D ssid ", |
| 215 | ni->ni_bssid, ":"); |
| 216 | ieee80211_print_essid(vap->iv_bss->ni_essid, |
| 217 | ni->ni_esslen); |
| 218 | /* XXX MCS/HT */ |
| 219 | kprintf(" channel %d start %uMb\n", |
| 220 | ieee80211_chan2ieee(ic, ic->ic_curchan), |
| 221 | IEEE80211_RATE2MBS(ni->ni_txrate)); |
| 222 | } |
| 223 | #endif |
| 224 | break; |
| 225 | default: |
| 226 | goto invalid; |
| 227 | } |
| 228 | /* |
| 229 | * When 802.1x is not in use mark the port authorized |
| 230 | * at this point so traffic can flow. |
| 231 | */ |
| 232 | if (ni->ni_authmode != IEEE80211_AUTH_8021X) |
| 233 | ieee80211_node_authorize(ni); |
| 234 | /* |
| 235 | * Fake association when joining an existing bss. |
| 236 | */ |
| 237 | if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) && |
| 238 | ic->ic_newassoc != NULL) |
| 239 | ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN); |
| 240 | break; |
| 241 | case IEEE80211_S_SLEEP: |
| 242 | ieee80211_sta_pwrsave(vap, 0); |
| 243 | break; |
| 244 | default: |
| 245 | invalid: |
| 246 | IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, |
| 247 | "%s: unexpected state transition %s -> %s\n", __func__, |
| 248 | ieee80211_state_name[ostate], ieee80211_state_name[nstate]); |
| 249 | break; |
| 250 | } |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Decide if a received management frame should be |
| 256 | * printed when debugging is enabled. This filters some |
| 257 | * of the less interesting frames that come frequently |
| 258 | * (e.g. beacons). |
| 259 | */ |
| 260 | static __inline int |
| 261 | doprint(struct ieee80211vap *vap, int subtype) |
| 262 | { |
| 263 | switch (subtype) { |
| 264 | case IEEE80211_FC0_SUBTYPE_BEACON: |
| 265 | return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN); |
| 266 | case IEEE80211_FC0_SUBTYPE_PROBE_REQ: |
| 267 | return 1; |
| 268 | } |
| 269 | return 1; |
| 270 | } |
| 271 | |
| 272 | /* |
| 273 | * Process a received frame. The node associated with the sender |
| 274 | * should be supplied. If nothing was found in the node table then |
| 275 | * the caller is assumed to supply a reference to iv_bss instead. |
| 276 | * The RSSI and a timestamp are also supplied. The RSSI data is used |
| 277 | * during AP scanning to select a AP to associate with; it can have |
| 278 | * any units so long as values have consistent units and higher values |
| 279 | * mean ``better signal''. The receive timestamp is currently not used |
| 280 | * by the 802.11 layer. |
| 281 | */ |
| 282 | static int |
| 283 | adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf) |
| 284 | { |
| 285 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 286 | #define HAS_SEQ(type) ((type & 0x4) == 0) |
| 287 | struct ieee80211vap *vap = ni->ni_vap; |
| 288 | struct ieee80211com *ic = ni->ni_ic; |
| 289 | struct ifnet *ifp = vap->iv_ifp; |
| 290 | struct ieee80211_frame *wh; |
| 291 | struct ieee80211_key *key; |
| 292 | struct ether_header *eh; |
| 293 | int hdrspace, need_tap = 1; /* mbuf need to be tapped. */ |
| 294 | uint8_t dir, type, subtype, qos; |
| 295 | uint8_t *bssid; |
| 296 | uint16_t rxseq; |
| 297 | |
| 298 | if (m->m_flags & M_AMPDU_MPDU) { |
| 299 | /* |
| 300 | * Fastpath for A-MPDU reorder q resubmission. Frames |
| 301 | * w/ M_AMPDU_MPDU marked have already passed through |
| 302 | * here but were received out of order and been held on |
| 303 | * the reorder queue. When resubmitted they are marked |
| 304 | * with the M_AMPDU_MPDU flag and we can bypass most of |
| 305 | * the normal processing. |
| 306 | */ |
| 307 | wh = mtod(m, struct ieee80211_frame *); |
| 308 | type = IEEE80211_FC0_TYPE_DATA; |
| 309 | dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; |
| 310 | subtype = IEEE80211_FC0_SUBTYPE_QOS; |
| 311 | hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ |
| 312 | goto resubmit_ampdu; |
| 313 | } |
| 314 | |
| 315 | KASSERT(ni != NULL, ("null node")); |
| 316 | ni->ni_inact = ni->ni_inact_reload; |
| 317 | |
| 318 | type = -1; /* undefined */ |
| 319 | |
| 320 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { |
| 321 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, |
| 322 | ni->ni_macaddr, NULL, |
| 323 | "too short (1): len %u", m->m_pkthdr.len); |
| 324 | vap->iv_stats.is_rx_tooshort++; |
| 325 | goto out; |
| 326 | } |
| 327 | /* |
| 328 | * Bit of a cheat here, we use a pointer for a 3-address |
| 329 | * frame format but don't reference fields past outside |
| 330 | * ieee80211_frame_min w/o first validating the data is |
| 331 | * present. |
| 332 | */ |
| 333 | wh = mtod(m, struct ieee80211_frame *); |
| 334 | |
| 335 | if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != |
| 336 | IEEE80211_FC0_VERSION_0) { |
| 337 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, |
| 338 | ni->ni_macaddr, NULL, "wrong version, fc %02x:%02x", |
| 339 | wh->i_fc[0], wh->i_fc[1]); |
| 340 | vap->iv_stats.is_rx_badversion++; |
| 341 | goto err; |
| 342 | } |
| 343 | |
| 344 | dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; |
| 345 | type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; |
| 346 | subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; |
| 347 | if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { |
| 348 | if (dir != IEEE80211_FC1_DIR_NODS) |
| 349 | bssid = wh->i_addr1; |
| 350 | else if (type == IEEE80211_FC0_TYPE_CTL) |
| 351 | bssid = wh->i_addr1; |
| 352 | else { |
| 353 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { |
| 354 | IEEE80211_DISCARD_MAC(vap, |
| 355 | IEEE80211_MSG_ANY, ni->ni_macaddr, |
| 356 | NULL, "too short (2): len %u", |
| 357 | m->m_pkthdr.len); |
| 358 | vap->iv_stats.is_rx_tooshort++; |
| 359 | goto out; |
| 360 | } |
| 361 | bssid = wh->i_addr3; |
| 362 | } |
| 363 | /* |
| 364 | * Validate the bssid. |
| 365 | */ |
| 366 | if (!IEEE80211_ADDR_EQ(bssid, vap->iv_bss->ni_bssid) && |
| 367 | !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { |
| 368 | /* not interested in */ |
| 369 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, |
| 370 | bssid, NULL, "%s", "not to bss"); |
| 371 | vap->iv_stats.is_rx_wrongbss++; |
| 372 | goto out; |
| 373 | } |
| 374 | /* |
| 375 | * Data frame, cons up a node when it doesn't |
| 376 | * exist. This should probably done after an ACL check. |
| 377 | */ |
| 378 | if (type == IEEE80211_FC0_TYPE_DATA && |
| 379 | ni == vap->iv_bss && |
| 380 | !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { |
| 381 | /* |
| 382 | * Beware of frames that come in too early; we |
| 383 | * can receive broadcast frames and creating sta |
| 384 | * entries will blow up because there is no bss |
| 385 | * channel yet. |
| 386 | */ |
| 387 | if (vap->iv_state != IEEE80211_S_RUN) { |
| 388 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 389 | wh, "data", "not in RUN state (%s)", |
| 390 | ieee80211_state_name[vap->iv_state]); |
| 391 | vap->iv_stats.is_rx_badstate++; |
| 392 | goto err; |
| 393 | } |
| 394 | /* |
| 395 | * Fake up a node for this newly |
| 396 | * discovered member of the IBSS. |
| 397 | */ |
| 398 | ni = ieee80211_fakeup_adhoc_node(vap, wh->i_addr2); |
| 399 | if (ni == NULL) { |
| 400 | /* NB: stat kept for alloc failure */ |
| 401 | goto err; |
| 402 | } |
| 403 | } |
| 404 | IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); |
| 405 | ni->ni_noise = nf; |
| 406 | if (HAS_SEQ(type)) { |
| 407 | uint8_t tid = ieee80211_gettid(wh); |
| 408 | if (IEEE80211_QOS_HAS_SEQ(wh) && |
| 409 | TID_TO_WME_AC(tid) >= WME_AC_VI) |
| 410 | ic->ic_wme.wme_hipri_traffic++; |
| 411 | rxseq = le16toh(*(uint16_t *)wh->i_seq); |
| 412 | if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && |
| 413 | (wh->i_fc[1] & IEEE80211_FC1_RETRY) && |
| 414 | SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { |
| 415 | /* duplicate, discard */ |
| 416 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, |
| 417 | bssid, "duplicate", |
| 418 | "seqno <%u,%u> fragno <%u,%u> tid %u", |
| 419 | rxseq >> IEEE80211_SEQ_SEQ_SHIFT, |
| 420 | ni->ni_rxseqs[tid] >> |
| 421 | IEEE80211_SEQ_SEQ_SHIFT, |
| 422 | rxseq & IEEE80211_SEQ_FRAG_MASK, |
| 423 | ni->ni_rxseqs[tid] & |
| 424 | IEEE80211_SEQ_FRAG_MASK, |
| 425 | tid); |
| 426 | vap->iv_stats.is_rx_dup++; |
| 427 | IEEE80211_NODE_STAT(ni, rx_dup); |
| 428 | goto out; |
| 429 | } |
| 430 | ni->ni_rxseqs[tid] = rxseq; |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | switch (type) { |
| 435 | case IEEE80211_FC0_TYPE_DATA: |
| 436 | hdrspace = ieee80211_hdrspace(ic, wh); |
| 437 | if (m->m_len < hdrspace && |
| 438 | (m = m_pullup(m, hdrspace)) == NULL) { |
| 439 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, |
| 440 | ni->ni_macaddr, NULL, |
| 441 | "data too short: expecting %u", hdrspace); |
| 442 | vap->iv_stats.is_rx_tooshort++; |
| 443 | goto out; /* XXX */ |
| 444 | } |
| 445 | if (dir != IEEE80211_FC1_DIR_NODS) { |
| 446 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 447 | wh, "data", "incorrect dir 0x%x", dir); |
| 448 | vap->iv_stats.is_rx_wrongdir++; |
| 449 | goto out; |
| 450 | } |
| 451 | /* XXX no power-save support */ |
| 452 | |
| 453 | /* |
| 454 | * Handle A-MPDU re-ordering. If the frame is to be |
| 455 | * processed directly then ieee80211_ampdu_reorder |
| 456 | * will return 0; otherwise it has consumed the mbuf |
| 457 | * and we should do nothing more with it. |
| 458 | */ |
| 459 | if ((m->m_flags & M_AMPDU) && |
| 460 | ieee80211_ampdu_reorder(ni, m) != 0) { |
| 461 | m = NULL; |
| 462 | goto out; |
| 463 | } |
| 464 | resubmit_ampdu: |
| 465 | |
| 466 | /* |
| 467 | * Handle privacy requirements. Note that we |
| 468 | * must not be preempted from here until after |
| 469 | * we (potentially) call ieee80211_crypto_demic; |
| 470 | * otherwise we may violate assumptions in the |
| 471 | * crypto cipher modules used to do delayed update |
| 472 | * of replay sequence numbers. |
| 473 | */ |
| 474 | if (wh->i_fc[1] & IEEE80211_FC1_WEP) { |
| 475 | if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) { |
| 476 | /* |
| 477 | * Discard encrypted frames when privacy is off. |
| 478 | */ |
| 479 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 480 | wh, "WEP", "%s", "PRIVACY off"); |
| 481 | vap->iv_stats.is_rx_noprivacy++; |
| 482 | IEEE80211_NODE_STAT(ni, rx_noprivacy); |
| 483 | goto out; |
| 484 | } |
| 485 | key = ieee80211_crypto_decap(ni, m, hdrspace); |
| 486 | if (key == NULL) { |
| 487 | /* NB: stats+msgs handled in crypto_decap */ |
| 488 | IEEE80211_NODE_STAT(ni, rx_wepfail); |
| 489 | goto out; |
| 490 | } |
| 491 | wh = mtod(m, struct ieee80211_frame *); |
| 492 | wh->i_fc[1] &= ~IEEE80211_FC1_WEP; |
| 493 | } else { |
| 494 | /* XXX M_WEP and IEEE80211_F_PRIVACY */ |
| 495 | key = NULL; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Save QoS bits for use below--before we strip the header. |
| 500 | */ |
| 501 | if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { |
| 502 | qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? |
| 503 | ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : |
| 504 | ((struct ieee80211_qosframe *)wh)->i_qos[0]; |
| 505 | } else |
| 506 | qos = 0; |
| 507 | |
| 508 | /* |
| 509 | * Next up, any fragmentation. |
| 510 | */ |
| 511 | if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { |
| 512 | m = ieee80211_defrag(ni, m, hdrspace); |
| 513 | if (m == NULL) { |
| 514 | /* Fragment dropped or frame not complete yet */ |
| 515 | goto out; |
| 516 | } |
| 517 | } |
| 518 | wh = NULL; /* no longer valid, catch any uses */ |
| 519 | |
| 520 | /* |
| 521 | * Next strip any MSDU crypto bits. |
| 522 | */ |
| 523 | if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) { |
| 524 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, |
| 525 | ni->ni_macaddr, "data", "%s", "demic error"); |
| 526 | vap->iv_stats.is_rx_demicfail++; |
| 527 | IEEE80211_NODE_STAT(ni, rx_demicfail); |
| 528 | goto out; |
| 529 | } |
| 530 | |
| 531 | /* copy to listener after decrypt */ |
| 532 | if (ieee80211_radiotap_active_vap(vap)) |
| 533 | ieee80211_radiotap_rx(vap, m); |
| 534 | need_tap = 0; |
| 535 | |
| 536 | /* |
| 537 | * Finally, strip the 802.11 header. |
| 538 | */ |
| 539 | m = ieee80211_decap(vap, m, hdrspace); |
| 540 | if (m == NULL) { |
| 541 | /* XXX mask bit to check for both */ |
| 542 | /* don't count Null data frames as errors */ |
| 543 | if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || |
| 544 | subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) |
| 545 | goto out; |
| 546 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, |
| 547 | ni->ni_macaddr, "data", "%s", "decap error"); |
| 548 | vap->iv_stats.is_rx_decap++; |
| 549 | IEEE80211_NODE_STAT(ni, rx_decap); |
| 550 | goto err; |
| 551 | } |
| 552 | eh = mtod(m, struct ether_header *); |
| 553 | if (!ieee80211_node_is_authorized(ni)) { |
| 554 | /* |
| 555 | * Deny any non-PAE frames received prior to |
| 556 | * authorization. For open/shared-key |
| 557 | * authentication the port is mark authorized |
| 558 | * after authentication completes. For 802.1x |
| 559 | * the port is not marked authorized by the |
| 560 | * authenticator until the handshake has completed. |
| 561 | */ |
| 562 | if (eh->ether_type != htons(ETHERTYPE_PAE)) { |
| 563 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, |
| 564 | eh->ether_shost, "data", |
| 565 | "unauthorized port: ether type 0x%x len %u", |
| 566 | eh->ether_type, m->m_pkthdr.len); |
| 567 | vap->iv_stats.is_rx_unauth++; |
| 568 | IEEE80211_NODE_STAT(ni, rx_unauth); |
| 569 | goto err; |
| 570 | } |
| 571 | } else { |
| 572 | /* |
| 573 | * When denying unencrypted frames, discard |
| 574 | * any non-PAE frames received without encryption. |
| 575 | */ |
| 576 | if ((vap->iv_flags & IEEE80211_F_DROPUNENC) && |
| 577 | (key == NULL && (m->m_flags & M_WEP) == 0) && |
| 578 | eh->ether_type != htons(ETHERTYPE_PAE)) { |
| 579 | /* |
| 580 | * Drop unencrypted frames. |
| 581 | */ |
| 582 | vap->iv_stats.is_rx_unencrypted++; |
| 583 | IEEE80211_NODE_STAT(ni, rx_unencrypted); |
| 584 | goto out; |
| 585 | } |
| 586 | } |
| 587 | /* XXX require HT? */ |
| 588 | if (qos & IEEE80211_QOS_AMSDU) { |
| 589 | m = ieee80211_decap_amsdu(ni, m); |
| 590 | if (m == NULL) |
| 591 | return IEEE80211_FC0_TYPE_DATA; |
| 592 | } else { |
| 593 | #ifdef IEEE80211_SUPPORT_SUPERG |
| 594 | m = ieee80211_decap_fastframe(vap, ni, m); |
| 595 | if (m == NULL) |
| 596 | return IEEE80211_FC0_TYPE_DATA; |
| 597 | #endif |
| 598 | } |
| 599 | if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL) |
| 600 | ieee80211_deliver_data(ni->ni_wdsvap, ni, m); |
| 601 | else |
| 602 | ieee80211_deliver_data(vap, ni, m); |
| 603 | return IEEE80211_FC0_TYPE_DATA; |
| 604 | |
| 605 | case IEEE80211_FC0_TYPE_MGT: |
| 606 | vap->iv_stats.is_rx_mgmt++; |
| 607 | IEEE80211_NODE_STAT(ni, rx_mgmt); |
| 608 | if (dir != IEEE80211_FC1_DIR_NODS) { |
| 609 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 610 | wh, "data", "incorrect dir 0x%x", dir); |
| 611 | vap->iv_stats.is_rx_wrongdir++; |
| 612 | goto err; |
| 613 | } |
| 614 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { |
| 615 | IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, |
| 616 | ni->ni_macaddr, "mgt", "too short: len %u", |
| 617 | m->m_pkthdr.len); |
| 618 | vap->iv_stats.is_rx_tooshort++; |
| 619 | goto out; |
| 620 | } |
| 621 | #ifdef IEEE80211_DEBUG |
| 622 | if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) || |
| 623 | ieee80211_msg_dumppkts(vap)) { |
| 624 | if_printf(ifp, "received %s from %6D rssi %d\n", |
| 625 | ieee80211_mgt_subtype_name[subtype >> |
| 626 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 627 | wh->i_addr2, ":", rssi); |
| 628 | } |
| 629 | #endif |
| 630 | if (wh->i_fc[1] & IEEE80211_FC1_WEP) { |
| 631 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 632 | wh, NULL, "%s", "WEP set but not permitted"); |
| 633 | vap->iv_stats.is_rx_mgtdiscard++; /* XXX */ |
| 634 | goto out; |
| 635 | } |
| 636 | vap->iv_recv_mgmt(ni, m, subtype, rssi, nf); |
| 637 | goto out; |
| 638 | |
| 639 | case IEEE80211_FC0_TYPE_CTL: |
| 640 | vap->iv_stats.is_rx_ctl++; |
| 641 | IEEE80211_NODE_STAT(ni, rx_ctrl); |
| 642 | vap->iv_recv_ctl(ni, m, subtype); |
| 643 | goto out; |
| 644 | |
| 645 | default: |
| 646 | IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, |
| 647 | wh, "bad", "frame type 0x%x", type); |
| 648 | /* should not come here */ |
| 649 | break; |
| 650 | } |
| 651 | err: |
| 652 | ifp->if_ierrors++; |
| 653 | out: |
| 654 | if (m != NULL) { |
| 655 | if (need_tap && ieee80211_radiotap_active_vap(vap)) |
| 656 | ieee80211_radiotap_rx(vap, m); |
| 657 | m_freem(m); |
| 658 | } |
| 659 | return type; |
| 660 | #undef SEQ_LEQ |
| 661 | } |
| 662 | |
| 663 | static int |
| 664 | is11bclient(const uint8_t *rates, const uint8_t *xrates) |
| 665 | { |
| 666 | static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11); |
| 667 | int i; |
| 668 | |
| 669 | /* NB: the 11b clients we care about will not have xrates */ |
| 670 | if (xrates != NULL || rates == NULL) |
| 671 | return 0; |
| 672 | for (i = 0; i < rates[1]; i++) { |
| 673 | int r = rates[2+i] & IEEE80211_RATE_VAL; |
| 674 | if (r > 2*11 || ((1<<r) & brates) == 0) |
| 675 | return 0; |
| 676 | } |
| 677 | return 1; |
| 678 | } |
| 679 | |
| 680 | static void |
| 681 | adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, |
| 682 | int subtype, int rssi, int nf) |
| 683 | { |
| 684 | struct ieee80211vap *vap = ni->ni_vap; |
| 685 | struct ieee80211com *ic = ni->ni_ic; |
| 686 | struct ieee80211_frame *wh; |
| 687 | uint8_t *frm, *efrm, *sfrm; |
| 688 | uint8_t *ssid, *rates, *xrates; |
| 689 | |
| 690 | wh = mtod(m0, struct ieee80211_frame *); |
| 691 | frm = (uint8_t *)&wh[1]; |
| 692 | efrm = mtod(m0, uint8_t *) + m0->m_len; |
| 693 | switch (subtype) { |
| 694 | case IEEE80211_FC0_SUBTYPE_PROBE_RESP: |
| 695 | case IEEE80211_FC0_SUBTYPE_BEACON: { |
| 696 | struct ieee80211_scanparams scan; |
| 697 | /* |
| 698 | * We process beacon/probe response |
| 699 | * frames to discover neighbors. |
| 700 | */ |
| 701 | if (ieee80211_parse_beacon(ni, m0, &scan) != 0) |
| 702 | return; |
| 703 | /* |
| 704 | * Count frame now that we know it's to be processed. |
| 705 | */ |
| 706 | if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { |
| 707 | vap->iv_stats.is_rx_beacon++; /* XXX remove */ |
| 708 | IEEE80211_NODE_STAT(ni, rx_beacons); |
| 709 | } else |
| 710 | IEEE80211_NODE_STAT(ni, rx_proberesp); |
| 711 | /* |
| 712 | * If scanning, just pass information to the scan module. |
| 713 | */ |
| 714 | if (ic->ic_flags & IEEE80211_F_SCAN) { |
| 715 | if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { |
| 716 | /* |
| 717 | * Actively scanning a channel marked passive; |
| 718 | * send a probe request now that we know there |
| 719 | * is 802.11 traffic present. |
| 720 | * |
| 721 | * XXX check if the beacon we recv'd gives |
| 722 | * us what we need and suppress the probe req |
| 723 | */ |
| 724 | ieee80211_probe_curchan(vap, 1); |
| 725 | ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; |
| 726 | } |
| 727 | ieee80211_add_scan(vap, &scan, wh, subtype, rssi, nf); |
| 728 | return; |
| 729 | } |
| 730 | if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { |
| 731 | if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { |
| 732 | /* |
| 733 | * Create a new entry in the neighbor table. |
| 734 | */ |
| 735 | ni = ieee80211_add_neighbor(vap, wh, &scan); |
| 736 | } else if (ni->ni_capinfo == 0) { |
| 737 | /* |
| 738 | * Update faked node created on transmit. |
| 739 | * Note this also updates the tsf. |
| 740 | */ |
| 741 | ieee80211_init_neighbor(ni, wh, &scan); |
| 742 | } else { |
| 743 | /* |
| 744 | * Record tsf for potential resync. |
| 745 | */ |
| 746 | memcpy(ni->ni_tstamp.data, scan.tstamp, |
| 747 | sizeof(ni->ni_tstamp)); |
| 748 | } |
| 749 | if (ni != NULL) { |
| 750 | IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi); |
| 751 | ni->ni_noise = nf; |
| 752 | } |
| 753 | } |
| 754 | break; |
| 755 | } |
| 756 | |
| 757 | case IEEE80211_FC0_SUBTYPE_PROBE_REQ: |
| 758 | if (vap->iv_state != IEEE80211_S_RUN) { |
| 759 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 760 | wh, NULL, "wrong state %s", |
| 761 | ieee80211_state_name[vap->iv_state]); |
| 762 | vap->iv_stats.is_rx_mgtdiscard++; |
| 763 | return; |
| 764 | } |
| 765 | if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { |
| 766 | /* frame must be directed */ |
| 767 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 768 | wh, NULL, "%s", "not unicast"); |
| 769 | vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */ |
| 770 | return; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * prreq frame format |
| 775 | * [tlv] ssid |
| 776 | * [tlv] supported rates |
| 777 | * [tlv] extended supported rates |
| 778 | */ |
| 779 | ssid = rates = xrates = NULL; |
| 780 | sfrm = frm; |
| 781 | while (efrm - frm > 1) { |
| 782 | IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); |
| 783 | switch (*frm) { |
| 784 | case IEEE80211_ELEMID_SSID: |
| 785 | ssid = frm; |
| 786 | break; |
| 787 | case IEEE80211_ELEMID_RATES: |
| 788 | rates = frm; |
| 789 | break; |
| 790 | case IEEE80211_ELEMID_XRATES: |
| 791 | xrates = frm; |
| 792 | break; |
| 793 | } |
| 794 | frm += frm[1] + 2; |
| 795 | } |
| 796 | IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return); |
| 797 | if (xrates != NULL) |
| 798 | IEEE80211_VERIFY_ELEMENT(xrates, |
| 799 | IEEE80211_RATE_MAXSIZE - rates[1], return); |
| 800 | IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return); |
| 801 | IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return); |
| 802 | if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { |
| 803 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 804 | wh, NULL, |
| 805 | "%s", "no ssid with ssid suppression enabled"); |
| 806 | vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/ |
| 807 | return; |
| 808 | } |
| 809 | |
| 810 | /* XXX find a better class or define it's own */ |
| 811 | IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2, |
| 812 | "%s", "recv probe req"); |
| 813 | /* |
| 814 | * Some legacy 11b clients cannot hack a complete |
| 815 | * probe response frame. When the request includes |
| 816 | * only a bare-bones rate set, communicate this to |
| 817 | * the transmit side. |
| 818 | */ |
| 819 | ieee80211_send_proberesp(vap, wh->i_addr2, |
| 820 | is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0); |
| 821 | break; |
| 822 | |
| 823 | case IEEE80211_FC0_SUBTYPE_ACTION: { |
| 824 | const struct ieee80211_action *ia; |
| 825 | |
| 826 | if (vap->iv_state != IEEE80211_S_RUN) { |
| 827 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 828 | wh, NULL, "wrong state %s", |
| 829 | ieee80211_state_name[vap->iv_state]); |
| 830 | vap->iv_stats.is_rx_mgtdiscard++; |
| 831 | return; |
| 832 | } |
| 833 | /* |
| 834 | * action frame format: |
| 835 | * [1] category |
| 836 | * [1] action |
| 837 | * [tlv] parameters |
| 838 | */ |
| 839 | IEEE80211_VERIFY_LENGTH(efrm - frm, |
| 840 | sizeof(struct ieee80211_action), return); |
| 841 | ia = (const struct ieee80211_action *) frm; |
| 842 | |
| 843 | vap->iv_stats.is_rx_action++; |
| 844 | IEEE80211_NODE_STAT(ni, rx_action); |
| 845 | |
| 846 | /* verify frame payloads but defer processing */ |
| 847 | /* XXX maybe push this to method */ |
| 848 | switch (ia->ia_category) { |
| 849 | case IEEE80211_ACTION_CAT_BA: |
| 850 | switch (ia->ia_action) { |
| 851 | case IEEE80211_ACTION_BA_ADDBA_REQUEST: |
| 852 | IEEE80211_VERIFY_LENGTH(efrm - frm, |
| 853 | sizeof(struct ieee80211_action_ba_addbarequest), |
| 854 | return); |
| 855 | break; |
| 856 | case IEEE80211_ACTION_BA_ADDBA_RESPONSE: |
| 857 | IEEE80211_VERIFY_LENGTH(efrm - frm, |
| 858 | sizeof(struct ieee80211_action_ba_addbaresponse), |
| 859 | return); |
| 860 | break; |
| 861 | case IEEE80211_ACTION_BA_DELBA: |
| 862 | IEEE80211_VERIFY_LENGTH(efrm - frm, |
| 863 | sizeof(struct ieee80211_action_ba_delba), |
| 864 | return); |
| 865 | break; |
| 866 | } |
| 867 | break; |
| 868 | case IEEE80211_ACTION_CAT_HT: |
| 869 | switch (ia->ia_action) { |
| 870 | case IEEE80211_ACTION_HT_TXCHWIDTH: |
| 871 | IEEE80211_VERIFY_LENGTH(efrm - frm, |
| 872 | sizeof(struct ieee80211_action_ht_txchwidth), |
| 873 | return); |
| 874 | break; |
| 875 | } |
| 876 | break; |
| 877 | } |
| 878 | ic->ic_recv_action(ni, wh, frm, efrm); |
| 879 | break; |
| 880 | } |
| 881 | |
| 882 | case IEEE80211_FC0_SUBTYPE_AUTH: |
| 883 | case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: |
| 884 | case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: |
| 885 | case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: |
| 886 | case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: |
| 887 | case IEEE80211_FC0_SUBTYPE_DEAUTH: |
| 888 | case IEEE80211_FC0_SUBTYPE_DISASSOC: |
| 889 | IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT, |
| 890 | wh, NULL, "%s", "not handled"); |
| 891 | vap->iv_stats.is_rx_mgtdiscard++; |
| 892 | return; |
| 893 | |
| 894 | default: |
| 895 | IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY, |
| 896 | wh, "mgt", "subtype 0x%x not handled", subtype); |
| 897 | vap->iv_stats.is_rx_badsubtype++; |
| 898 | break; |
| 899 | } |
| 900 | } |
| 901 | #undef IEEE80211_VERIFY_LENGTH |
| 902 | #undef IEEE80211_VERIFY_ELEMENT |
| 903 | |
| 904 | static void |
| 905 | ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0, |
| 906 | int subtype, int rssi, int nf) |
| 907 | { |
| 908 | struct ieee80211vap *vap = ni->ni_vap; |
| 909 | struct ieee80211com *ic = ni->ni_ic; |
| 910 | |
| 911 | /* |
| 912 | * Process management frames when scanning; useful for doing |
| 913 | * a site-survey. |
| 914 | */ |
| 915 | if (ic->ic_flags & IEEE80211_F_SCAN) |
| 916 | adhoc_recv_mgmt(ni, m0, subtype, rssi, nf); |
| 917 | else |
| 918 | vap->iv_stats.is_rx_mgtdiscard++; |
| 919 | } |
| 920 | |
| 921 | static void |
| 922 | adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m0, int subtype) |
| 923 | { |
| 924 | } |