| 1 | /* $NetBSD: ieee80211_input.c,v 1.85 2016/09/27 20:20:06 christos Exp $ */ |
| 2 | /*- |
| 3 | * Copyright (c) 2001 Atsushi Onoe |
| 4 | * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * 1. Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * 2. Redistributions in binary form must reproduce the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer in the |
| 14 | * documentation and/or other materials provided with the distribution. |
| 15 | * 3. The name of the author may not be used to endorse or promote products |
| 16 | * derived from this software without specific prior written permission. |
| 17 | * |
| 18 | * Alternatively, this software may be distributed under the terms of the |
| 19 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 20 | * Software Foundation. |
| 21 | * |
| 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| 23 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| 24 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| 25 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 27 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| 31 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | #ifdef __FreeBSD__ |
| 36 | __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_input.c,v 1.81 2005/08/10 16:22:29 sam Exp $" ); |
| 37 | #endif |
| 38 | #ifdef __NetBSD__ |
| 39 | __KERNEL_RCSID(0, "$NetBSD: ieee80211_input.c,v 1.85 2016/09/27 20:20:06 christos Exp $" ); |
| 40 | #endif |
| 41 | |
| 42 | #ifdef _KERNEL_OPT |
| 43 | #include "opt_inet.h" |
| 44 | #endif |
| 45 | |
| 46 | #ifdef __NetBSD__ |
| 47 | #endif /* __NetBSD__ */ |
| 48 | |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/systm.h> |
| 51 | #include <sys/mbuf.h> |
| 52 | #include <sys/malloc.h> |
| 53 | #include <sys/endian.h> |
| 54 | #include <sys/kernel.h> |
| 55 | |
| 56 | #include <sys/socket.h> |
| 57 | #include <sys/sockio.h> |
| 58 | #include <sys/endian.h> |
| 59 | #include <sys/errno.h> |
| 60 | #include <sys/proc.h> |
| 61 | #include <sys/sysctl.h> |
| 62 | |
| 63 | #include <net/if.h> |
| 64 | #include <net/if_media.h> |
| 65 | #include <net/if_arp.h> |
| 66 | #include <net/if_ether.h> |
| 67 | #include <net/if_llc.h> |
| 68 | |
| 69 | #include <net80211/ieee80211_var.h> |
| 70 | |
| 71 | #include <net/bpf.h> |
| 72 | |
| 73 | #ifdef INET |
| 74 | #include <netinet/in.h> |
| 75 | #include <net/if_ether.h> |
| 76 | #endif |
| 77 | |
| 78 | const struct timeval ieee80211_merge_print_intvl = {.tv_sec = 1, .tv_usec = 0}; |
| 79 | |
| 80 | #ifdef IEEE80211_DEBUG |
| 81 | |
| 82 | /* |
| 83 | * Decide if a received management frame should be |
| 84 | * printed when debugging is enabled. This filters some |
| 85 | * of the less interesting frames that come frequently |
| 86 | * (e.g. beacons). |
| 87 | */ |
| 88 | static __inline int |
| 89 | doprint(struct ieee80211com *ic, int subtype) |
| 90 | { |
| 91 | switch (subtype) { |
| 92 | case IEEE80211_FC0_SUBTYPE_BEACON: |
| 93 | return (ic->ic_flags & IEEE80211_F_SCAN); |
| 94 | case IEEE80211_FC0_SUBTYPE_PROBE_REQ: |
| 95 | return (ic->ic_opmode == IEEE80211_M_IBSS); |
| 96 | } |
| 97 | return 1; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * Emit a debug message about discarding a frame or information |
| 102 | * element. One format is for extracting the mac address from |
| 103 | * the frame header; the other is for when a header is not |
| 104 | * available or otherwise appropriate. |
| 105 | */ |
| 106 | #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) do { \ |
| 107 | if ((_ic)->ic_debug & (_m)) \ |
| 108 | ieee80211_discard_frame(_ic, _wh, _type, _fmt, __VA_ARGS__);\ |
| 109 | } while (0) |
| 110 | #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) do { \ |
| 111 | if ((_ic)->ic_debug & (_m)) \ |
| 112 | ieee80211_discard_ie(_ic, _wh, _type, _fmt, __VA_ARGS__);\ |
| 113 | } while (0) |
| 114 | #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) do { \ |
| 115 | if ((_ic)->ic_debug & (_m)) \ |
| 116 | ieee80211_discard_mac(_ic, _mac, _type, _fmt, __VA_ARGS__);\ |
| 117 | } while (0) |
| 118 | #define IEEE80211_DEBUGVAR(a) a |
| 119 | |
| 120 | static const u_int8_t *ieee80211_getbssid(struct ieee80211com *, |
| 121 | const struct ieee80211_frame *); |
| 122 | static void ieee80211_discard_frame(struct ieee80211com *, |
| 123 | const struct ieee80211_frame *, const char *type, const char *fmt, ...); |
| 124 | static void ieee80211_discard_ie(struct ieee80211com *, |
| 125 | const struct ieee80211_frame *, const char *type, const char *fmt, ...); |
| 126 | static void ieee80211_discard_mac(struct ieee80211com *, |
| 127 | const u_int8_t mac[IEEE80211_ADDR_LEN], const char *type, |
| 128 | const char *fmt, ...); |
| 129 | #else |
| 130 | #define IEEE80211_DISCARD(_ic, _m, _wh, _type, _fmt, ...) |
| 131 | #define IEEE80211_DISCARD_IE(_ic, _m, _wh, _type, _fmt, ...) |
| 132 | #define IEEE80211_DISCARD_MAC(_ic, _m, _mac, _type, _fmt, ...) |
| 133 | #define IEEE80211_DEBUGVAR(a) |
| 134 | #endif /* IEEE80211_DEBUG */ |
| 135 | |
| 136 | static struct mbuf *ieee80211_defrag(struct ieee80211com *, |
| 137 | struct ieee80211_node *, struct mbuf *, int); |
| 138 | static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); |
| 139 | static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, |
| 140 | const u_int8_t *mac, int subtype, int arg); |
| 141 | static void ieee80211_deliver_data(struct ieee80211com *, |
| 142 | struct ieee80211_node *, struct mbuf *); |
| 143 | #ifndef IEEE80211_NO_HOSTAP |
| 144 | static void ieee80211_node_pwrsave(struct ieee80211_node *, int enable); |
| 145 | static void ieee80211_recv_pspoll(struct ieee80211com *, |
| 146 | struct ieee80211_node *, struct mbuf *); |
| 147 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 148 | static void ieee80211_update_adhoc_node(struct ieee80211com *, |
| 149 | struct ieee80211_node *, struct ieee80211_frame *, |
| 150 | struct ieee80211_scanparams *, int, u_int32_t); |
| 151 | |
| 152 | /* |
| 153 | * Process a received frame. The node associated with the sender |
| 154 | * should be supplied. If nothing was found in the node table then |
| 155 | * the caller is assumed to supply a reference to ic_bss instead. |
| 156 | * The RSSI and a timestamp are also supplied. The RSSI data is used |
| 157 | * during AP scanning to select a AP to associate with; it can have |
| 158 | * any units so long as values have consistent units and higher values |
| 159 | * mean ``better signal''. The receive timestamp is currently not used |
| 160 | * by the 802.11 layer. |
| 161 | */ |
| 162 | int |
| 163 | ieee80211_input(struct ieee80211com *ic, struct mbuf *m, |
| 164 | struct ieee80211_node *ni, int , u_int32_t rstamp) |
| 165 | { |
| 166 | #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) |
| 167 | #define HAS_SEQ(type) ((type & 0x4) == 0) |
| 168 | struct ifnet *ifp = ic->ic_ifp; |
| 169 | struct ieee80211_frame *wh; |
| 170 | struct ieee80211_key *key; |
| 171 | struct ether_header *eh; |
| 172 | int hdrspace; |
| 173 | u_int8_t dir, type, subtype; |
| 174 | u_int8_t *bssid; |
| 175 | u_int16_t rxseq; |
| 176 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 177 | |
| 178 | IASSERT(ni != NULL, ("null node" )); |
| 179 | ni->ni_inact = ni->ni_inact_reload; |
| 180 | |
| 181 | /* trim CRC here so WEP can find its own CRC at the end of packet. */ |
| 182 | if (m->m_flags & M_HASFCS) { |
| 183 | m_adj(m, -IEEE80211_CRC_LEN); |
| 184 | m->m_flags &= ~M_HASFCS; |
| 185 | } |
| 186 | type = -1; /* undefined */ |
| 187 | /* |
| 188 | * In monitor mode, send everything directly to bpf. |
| 189 | * XXX may want to include the CRC |
| 190 | */ |
| 191 | if (ic->ic_opmode == IEEE80211_M_MONITOR) |
| 192 | goto out; |
| 193 | |
| 194 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { |
| 195 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, |
| 196 | ni->ni_macaddr, NULL, |
| 197 | "too short (1): len %u" , m->m_pkthdr.len); |
| 198 | ic->ic_stats.is_rx_tooshort++; |
| 199 | goto out; |
| 200 | } |
| 201 | /* |
| 202 | * Bit of a cheat here, we use a pointer for a 3-address |
| 203 | * frame format but don't reference fields past outside |
| 204 | * ieee80211_frame_min w/o first validating the data is |
| 205 | * present. |
| 206 | */ |
| 207 | wh = mtod(m, struct ieee80211_frame *); |
| 208 | |
| 209 | if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != |
| 210 | IEEE80211_FC0_VERSION_0) { |
| 211 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, |
| 212 | ni->ni_macaddr, NULL, "wrong version %x" , wh->i_fc[0]); |
| 213 | ic->ic_stats.is_rx_badversion++; |
| 214 | goto err; |
| 215 | } |
| 216 | |
| 217 | dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; |
| 218 | type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; |
| 219 | subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; |
| 220 | if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { |
| 221 | switch (ic->ic_opmode) { |
| 222 | case IEEE80211_M_STA: |
| 223 | bssid = wh->i_addr2; |
| 224 | if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { |
| 225 | /* not interested in */ |
| 226 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 227 | bssid, NULL, "node %s, %s" , |
| 228 | ether_snprintf(ebuf, sizeof(ebuf), |
| 229 | ni->ni_bssid), "not to bss" ); |
| 230 | ic->ic_stats.is_rx_wrongbss++; |
| 231 | goto out; |
| 232 | } |
| 233 | |
| 234 | /* Filter out packets not directed to us in case the |
| 235 | * device is in promiscous mode |
| 236 | */ |
| 237 | if ((! IEEE80211_IS_MULTICAST(wh->i_addr1)) |
| 238 | && (! IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr))) { |
| 239 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 240 | bssid, NULL, "not to cur sta: lladdr=%6D, addr1=%6D" , |
| 241 | ic->ic_myaddr, ":" , wh->i_addr1, ":" ); |
| 242 | ic->ic_stats.is_rx_wrongbss++; |
| 243 | goto out; |
| 244 | } |
| 245 | break; |
| 246 | case IEEE80211_M_IBSS: |
| 247 | case IEEE80211_M_AHDEMO: |
| 248 | case IEEE80211_M_HOSTAP: |
| 249 | if (dir != IEEE80211_FC1_DIR_NODS) |
| 250 | bssid = wh->i_addr1; |
| 251 | else if (type == IEEE80211_FC0_TYPE_CTL) |
| 252 | bssid = wh->i_addr1; |
| 253 | else { |
| 254 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { |
| 255 | IEEE80211_DISCARD_MAC(ic, |
| 256 | IEEE80211_MSG_ANY, ni->ni_macaddr, |
| 257 | NULL, "too short (2): len %u" , |
| 258 | m->m_pkthdr.len); |
| 259 | ic->ic_stats.is_rx_tooshort++; |
| 260 | goto out; |
| 261 | } |
| 262 | bssid = wh->i_addr3; |
| 263 | } |
| 264 | if (type != IEEE80211_FC0_TYPE_DATA) |
| 265 | break; |
| 266 | /* |
| 267 | * Data frame, validate the bssid. |
| 268 | */ |
| 269 | if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && |
| 270 | !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { |
| 271 | /* not interested in */ |
| 272 | IEEE80211_DEBUGVAR( |
| 273 | char bbuf[3 * ETHER_ADDR_LEN]); |
| 274 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 275 | bssid, NULL, "bss %s, broadcast %s, %s" , |
| 276 | ether_snprintf(ebuf, sizeof(ebuf), |
| 277 | ic->ic_bss->ni_bssid), |
| 278 | ether_snprintf(bbuf, sizeof(bbuf), |
| 279 | ifp->if_broadcastaddr), "not to bss" ); |
| 280 | ic->ic_stats.is_rx_wrongbss++; |
| 281 | goto out; |
| 282 | } |
| 283 | /* |
| 284 | * For adhoc mode we cons up a node when it doesn't |
| 285 | * exist. This should probably done after an ACL check. |
| 286 | */ |
| 287 | if (ni == ic->ic_bss && |
| 288 | ic->ic_opmode != IEEE80211_M_HOSTAP && |
| 289 | !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { |
| 290 | /* |
| 291 | * Fake up a node for this newly |
| 292 | * discovered member of the IBSS. |
| 293 | */ |
| 294 | ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, |
| 295 | wh->i_addr2); |
| 296 | if (ni == NULL) { |
| 297 | /* NB: stat kept for alloc failure */ |
| 298 | goto err; |
| 299 | } |
| 300 | } |
| 301 | break; |
| 302 | default: |
| 303 | goto out; |
| 304 | } |
| 305 | ni->ni_rssi = rssi; |
| 306 | ni->ni_rstamp = rstamp; |
| 307 | if (HAS_SEQ(type) && (ic->ic_opmode != IEEE80211_M_STA || |
| 308 | !IEEE80211_IS_MULTICAST(wh->i_addr1))) { |
| 309 | u_int8_t tid, retry; |
| 310 | u_int16_t rxno, orxno; |
| 311 | |
| 312 | if (ieee80211_has_qos(wh)) { |
| 313 | tid = ((struct ieee80211_qosframe *)wh)-> |
| 314 | i_qos[0] & IEEE80211_QOS_TID; |
| 315 | if (TID_TO_WME_AC(tid) >= WME_AC_VI) |
| 316 | ic->ic_wme.wme_hipri_traffic++; |
| 317 | tid++; |
| 318 | } else |
| 319 | tid = 0; |
| 320 | rxseq = le16toh(*(u_int16_t *)wh->i_seq); |
| 321 | retry = wh->i_fc[1] & IEEE80211_FC1_RETRY; |
| 322 | rxno = rxseq >> IEEE80211_SEQ_SEQ_SHIFT; |
| 323 | orxno = ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT; |
| 324 | if (retry && ( |
| 325 | (orxno == 4095 && rxno == orxno) || |
| 326 | (orxno != 4095 && |
| 327 | SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) |
| 328 | )) { |
| 329 | /* duplicate, discard */ |
| 330 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 331 | bssid, "duplicate" , |
| 332 | "seqno <%u,%u> fragno <%u,%u> tid %u" , |
| 333 | rxno, |
| 334 | orxno, |
| 335 | rxseq & IEEE80211_SEQ_FRAG_MASK, |
| 336 | ni->ni_rxseqs[tid] & |
| 337 | IEEE80211_SEQ_FRAG_MASK, |
| 338 | tid); |
| 339 | ic->ic_stats.is_rx_dup++; |
| 340 | IEEE80211_NODE_STAT(ni, rx_dup); |
| 341 | goto out; |
| 342 | } |
| 343 | ni->ni_rxseqs[tid] = rxseq; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | switch (type) { |
| 348 | case IEEE80211_FC0_TYPE_DATA: |
| 349 | hdrspace = ieee80211_hdrspace(ic, wh); |
| 350 | if (m->m_len < hdrspace && |
| 351 | (m = m_pullup(m, hdrspace)) == NULL) { |
| 352 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, |
| 353 | ni->ni_macaddr, NULL, |
| 354 | "data too short: expecting %u" , hdrspace); |
| 355 | ic->ic_stats.is_rx_tooshort++; |
| 356 | goto out; /* XXX */ |
| 357 | } |
| 358 | switch (ic->ic_opmode) { |
| 359 | case IEEE80211_M_STA: |
| 360 | if (dir != IEEE80211_FC1_DIR_FROMDS) { |
| 361 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 362 | wh, "data" , "%s" , "unknown dir 0x%x" , dir); |
| 363 | ic->ic_stats.is_rx_wrongdir++; |
| 364 | goto out; |
| 365 | } |
| 366 | if ((ifp->if_flags & IFF_SIMPLEX) && |
| 367 | IEEE80211_IS_MULTICAST(wh->i_addr1) && |
| 368 | IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { |
| 369 | /* |
| 370 | * In IEEE802.11 network, multicast packet |
| 371 | * sent from me is broadcasted from AP. |
| 372 | * It should be silently discarded for |
| 373 | * SIMPLEX interface. |
| 374 | */ |
| 375 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 376 | wh, NULL, "%s" , "multicast echo" ); |
| 377 | ic->ic_stats.is_rx_mcastecho++; |
| 378 | goto out; |
| 379 | } |
| 380 | break; |
| 381 | case IEEE80211_M_IBSS: |
| 382 | case IEEE80211_M_AHDEMO: |
| 383 | if (dir != IEEE80211_FC1_DIR_NODS) { |
| 384 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 385 | wh, "data" , "%s" , "unknown dir 0x%x" , dir); |
| 386 | ic->ic_stats.is_rx_wrongdir++; |
| 387 | goto out; |
| 388 | } |
| 389 | /* XXX no power-save support */ |
| 390 | break; |
| 391 | case IEEE80211_M_HOSTAP: |
| 392 | #ifndef IEEE80211_NO_HOSTAP |
| 393 | if (dir != IEEE80211_FC1_DIR_TODS) { |
| 394 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 395 | wh, "data" , "%s" , "unknown dir 0x%x" , dir); |
| 396 | ic->ic_stats.is_rx_wrongdir++; |
| 397 | goto out; |
| 398 | } |
| 399 | /* check if source STA is associated */ |
| 400 | if (ni == ic->ic_bss) { |
| 401 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 402 | wh, "data" , "%s" , "unknown src" ); |
| 403 | ieee80211_send_error(ic, ni, wh->i_addr2, |
| 404 | IEEE80211_FC0_SUBTYPE_DEAUTH, |
| 405 | IEEE80211_REASON_NOT_AUTHED); |
| 406 | ic->ic_stats.is_rx_notassoc++; |
| 407 | goto err; |
| 408 | } |
| 409 | if (ni->ni_associd == 0) { |
| 410 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 411 | wh, "data" , "%s" , "unassoc src" ); |
| 412 | IEEE80211_SEND_MGMT(ic, ni, |
| 413 | IEEE80211_FC0_SUBTYPE_DISASSOC, |
| 414 | IEEE80211_REASON_NOT_ASSOCED); |
| 415 | ic->ic_stats.is_rx_notassoc++; |
| 416 | goto err; |
| 417 | } |
| 418 | |
| 419 | /* |
| 420 | * Check for power save state change. |
| 421 | */ |
| 422 | if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ |
| 423 | (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) |
| 424 | ieee80211_node_pwrsave(ni, |
| 425 | wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); |
| 426 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 427 | break; |
| 428 | default: |
| 429 | /* XXX here to keep compiler happy */ |
| 430 | goto out; |
| 431 | } |
| 432 | |
| 433 | /* |
| 434 | * Handle privacy requirements. Note that we |
| 435 | * must not be preempted from here until after |
| 436 | * we (potentially) call ieee80211_crypto_demic; |
| 437 | * otherwise we may violate assumptions in the |
| 438 | * crypto cipher modules used to do delayed update |
| 439 | * of replay sequence numbers. |
| 440 | */ |
| 441 | if (wh->i_fc[1] & IEEE80211_FC1_WEP) { |
| 442 | if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { |
| 443 | /* |
| 444 | * Discard encrypted frames when privacy is off. |
| 445 | */ |
| 446 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 447 | wh, "WEP" , "%s" , "PRIVACY off" ); |
| 448 | ic->ic_stats.is_rx_noprivacy++; |
| 449 | IEEE80211_NODE_STAT(ni, rx_noprivacy); |
| 450 | goto out; |
| 451 | } |
| 452 | key = ieee80211_crypto_decap(ic, ni, m, hdrspace); |
| 453 | if (key == NULL) { |
| 454 | /* NB: stats+msgs handled in crypto_decap */ |
| 455 | IEEE80211_NODE_STAT(ni, rx_wepfail); |
| 456 | goto out; |
| 457 | } |
| 458 | wh = mtod(m, struct ieee80211_frame *); |
| 459 | wh->i_fc[1] &= ~IEEE80211_FC1_WEP; |
| 460 | } else { |
| 461 | key = NULL; |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * Next up, any fragmentation. |
| 466 | */ |
| 467 | if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { |
| 468 | m = ieee80211_defrag(ic, ni, m, hdrspace); |
| 469 | if (m == NULL) { |
| 470 | /* Fragment dropped or frame not complete yet */ |
| 471 | goto out; |
| 472 | } |
| 473 | } |
| 474 | wh = NULL; /* no longer valid, catch any uses */ |
| 475 | |
| 476 | /* |
| 477 | * Next strip any MSDU crypto bits. |
| 478 | */ |
| 479 | if (key != NULL && !ieee80211_crypto_demic(ic, key, m, 0)) { |
| 480 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 481 | ni->ni_macaddr, "data" , "%s" , "demic error" ); |
| 482 | IEEE80211_NODE_STAT(ni, rx_demicfail); |
| 483 | goto out; |
| 484 | } |
| 485 | |
| 486 | /* copy to listener after decrypt */ |
| 487 | bpf_mtap3(ic->ic_rawbpf, m); |
| 488 | |
| 489 | /* |
| 490 | * Finally, strip the 802.11 header. |
| 491 | */ |
| 492 | m = ieee80211_decap(ic, m, hdrspace); |
| 493 | if (m == NULL) { |
| 494 | /* don't count Null data frames as errors */ |
| 495 | if (subtype == IEEE80211_FC0_SUBTYPE_NODATA) |
| 496 | goto out; |
| 497 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 498 | ni->ni_macaddr, "data" , "%s" , "decap error" ); |
| 499 | ic->ic_stats.is_rx_decap++; |
| 500 | IEEE80211_NODE_STAT(ni, rx_decap); |
| 501 | goto err; |
| 502 | } |
| 503 | eh = mtod(m, struct ether_header *); |
| 504 | if (!ieee80211_node_is_authorized(ni)) { |
| 505 | /* |
| 506 | * Deny any non-PAE frames received prior to |
| 507 | * authorization. For open/shared-key |
| 508 | * authentication the port is mark authorized |
| 509 | * after authentication completes. For 802.1x |
| 510 | * the port is not marked authorized by the |
| 511 | * authenticator until the handshake has completed. |
| 512 | */ |
| 513 | if (eh->ether_type != htons(ETHERTYPE_PAE)) { |
| 514 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, |
| 515 | eh->ether_shost, "data" , |
| 516 | "unauthorized port: ether type 0x%x len %u" , |
| 517 | eh->ether_type, m->m_pkthdr.len); |
| 518 | ic->ic_stats.is_rx_unauth++; |
| 519 | IEEE80211_NODE_STAT(ni, rx_unauth); |
| 520 | goto err; |
| 521 | } |
| 522 | } else { |
| 523 | /* |
| 524 | * When denying unencrypted frames, discard |
| 525 | * any non-PAE frames received without encryption. |
| 526 | */ |
| 527 | if ((ic->ic_flags & IEEE80211_F_DROPUNENC) && |
| 528 | key == NULL && |
| 529 | eh->ether_type != htons(ETHERTYPE_PAE)) { |
| 530 | /* |
| 531 | * Drop unencrypted frames. |
| 532 | */ |
| 533 | ic->ic_stats.is_rx_unencrypted++; |
| 534 | IEEE80211_NODE_STAT(ni, rx_unencrypted); |
| 535 | goto out; |
| 536 | } |
| 537 | } |
| 538 | ifp->if_ipackets++; |
| 539 | IEEE80211_NODE_STAT(ni, rx_data); |
| 540 | IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); |
| 541 | |
| 542 | ieee80211_deliver_data(ic, ni, m); |
| 543 | return IEEE80211_FC0_TYPE_DATA; |
| 544 | |
| 545 | case IEEE80211_FC0_TYPE_MGT: |
| 546 | IEEE80211_NODE_STAT(ni, rx_mgmt); |
| 547 | if (dir != IEEE80211_FC1_DIR_NODS) { |
| 548 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 549 | wh, "data" , "%s" , "unknown dir 0x%x" , dir); |
| 550 | ic->ic_stats.is_rx_wrongdir++; |
| 551 | goto err; |
| 552 | } |
| 553 | if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { |
| 554 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, |
| 555 | ni->ni_macaddr, "mgt" , "too short: len %u" , |
| 556 | m->m_pkthdr.len); |
| 557 | ic->ic_stats.is_rx_tooshort++; |
| 558 | goto out; |
| 559 | } |
| 560 | #ifdef IEEE80211_DEBUG |
| 561 | if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || |
| 562 | ieee80211_msg_dumppkts(ic)) { |
| 563 | if_printf(ic->ic_ifp, "received %s from %s rssi %d\n" , |
| 564 | ieee80211_mgt_subtype_name[subtype >> |
| 565 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 566 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 567 | rssi); |
| 568 | } |
| 569 | #endif |
| 570 | if (wh->i_fc[1] & IEEE80211_FC1_WEP) { |
| 571 | if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { |
| 572 | /* |
| 573 | * Only shared key auth frames with a challenge |
| 574 | * should be encrypted, discard all others. |
| 575 | */ |
| 576 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 577 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 578 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 579 | "%s" , "WEP set but not permitted" ); |
| 580 | ic->ic_stats.is_rx_mgtdiscard++; /* XXX */ |
| 581 | goto out; |
| 582 | } |
| 583 | if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { |
| 584 | /* |
| 585 | * Discard encrypted frames when privacy is off. |
| 586 | */ |
| 587 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 588 | wh, "mgt" , "%s" , "WEP set but PRIVACY off" ); |
| 589 | ic->ic_stats.is_rx_noprivacy++; |
| 590 | goto out; |
| 591 | } |
| 592 | hdrspace = ieee80211_hdrspace(ic, wh); |
| 593 | key = ieee80211_crypto_decap(ic, ni, m, hdrspace); |
| 594 | if (key == NULL) { |
| 595 | /* NB: stats+msgs handled in crypto_decap */ |
| 596 | goto out; |
| 597 | } |
| 598 | wh = mtod(m, struct ieee80211_frame *); |
| 599 | wh->i_fc[1] &= ~IEEE80211_FC1_WEP; |
| 600 | } |
| 601 | bpf_mtap3(ic->ic_rawbpf, m); |
| 602 | (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp); |
| 603 | m_freem(m); |
| 604 | return type; |
| 605 | |
| 606 | case IEEE80211_FC0_TYPE_CTL: |
| 607 | IEEE80211_NODE_STAT(ni, rx_ctrl); |
| 608 | ic->ic_stats.is_rx_ctl++; |
| 609 | #ifndef IEEE80211_NO_HOSTAP |
| 610 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 611 | switch (subtype) { |
| 612 | case IEEE80211_FC0_SUBTYPE_PS_POLL: |
| 613 | ieee80211_recv_pspoll(ic, ni, m); |
| 614 | break; |
| 615 | } |
| 616 | } |
| 617 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 618 | goto out; |
| 619 | default: |
| 620 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, |
| 621 | wh, NULL, "bad frame type 0x%x" , type); |
| 622 | /* should not come here */ |
| 623 | break; |
| 624 | } |
| 625 | err: |
| 626 | ifp->if_ierrors++; |
| 627 | out: |
| 628 | if (m != NULL) { |
| 629 | bpf_mtap3(ic->ic_rawbpf, m); |
| 630 | m_freem(m); |
| 631 | } |
| 632 | return type; |
| 633 | #undef SEQ_LEQ |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * This function reassemble fragments. |
| 638 | */ |
| 639 | static struct mbuf * |
| 640 | ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni, |
| 641 | struct mbuf *m, int hdrspace) |
| 642 | { |
| 643 | struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); |
| 644 | struct ieee80211_frame *lwh; |
| 645 | u_int16_t rxseq; |
| 646 | u_int8_t fragno; |
| 647 | u_int8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; |
| 648 | struct mbuf *mfrag; |
| 649 | |
| 650 | IASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?" )); |
| 651 | |
| 652 | rxseq = le16toh(*(u_int16_t *)wh->i_seq); |
| 653 | fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; |
| 654 | |
| 655 | /* Quick way out, if there's nothing to defragment */ |
| 656 | if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) |
| 657 | return m; |
| 658 | |
| 659 | /* |
| 660 | * Remove frag to insure it doesn't get reaped by timer. |
| 661 | */ |
| 662 | if (ni->ni_table == NULL) { |
| 663 | /* |
| 664 | * Should never happen. If the node is orphaned (not in |
| 665 | * the table) then input packets should not reach here. |
| 666 | * Otherwise, a concurrent request that yanks the table |
| 667 | * should be blocked by other interlocking and/or by first |
| 668 | * shutting the driver down. Regardless, be defensive |
| 669 | * here and just bail |
| 670 | */ |
| 671 | /* XXX need msg+stat */ |
| 672 | m_freem(m); |
| 673 | return NULL; |
| 674 | } |
| 675 | IEEE80211_NODE_LOCK(ni->ni_table); |
| 676 | mfrag = ni->ni_rxfrag[0]; |
| 677 | ni->ni_rxfrag[0] = NULL; |
| 678 | IEEE80211_NODE_UNLOCK(ni->ni_table); |
| 679 | |
| 680 | /* |
| 681 | * Validate new fragment is in order and |
| 682 | * related to the previous ones. |
| 683 | */ |
| 684 | if (mfrag != NULL) { |
| 685 | u_int16_t last_rxseq; |
| 686 | |
| 687 | lwh = mtod(mfrag, struct ieee80211_frame *); |
| 688 | last_rxseq = le16toh(*(u_int16_t *)lwh->i_seq); |
| 689 | /* NB: check seq # and frag together */ |
| 690 | if (rxseq != last_rxseq+1 || |
| 691 | !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || |
| 692 | !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { |
| 693 | /* |
| 694 | * Unrelated fragment or no space for it, |
| 695 | * clear current fragments. |
| 696 | */ |
| 697 | m_freem(mfrag); |
| 698 | mfrag = NULL; |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | if (mfrag == NULL) { |
| 703 | if (fragno != 0) { /* !first fragment, discard */ |
| 704 | IEEE80211_NODE_STAT(ni, rx_defrag); |
| 705 | m_freem(m); |
| 706 | return NULL; |
| 707 | } |
| 708 | mfrag = m; |
| 709 | } else { /* concatenate */ |
| 710 | m_adj(m, hdrspace); /* strip header */ |
| 711 | m_cat(mfrag, m); |
| 712 | /* NB: m_cat doesn't update the packet header */ |
| 713 | mfrag->m_pkthdr.len += m->m_pkthdr.len; |
| 714 | /* track last seqnum and fragno */ |
| 715 | lwh = mtod(mfrag, struct ieee80211_frame *); |
| 716 | *(u_int16_t *) lwh->i_seq = *(u_int16_t *) wh->i_seq; |
| 717 | } |
| 718 | if (more_frag) { /* more to come, save */ |
| 719 | ni->ni_rxfragstamp = ticks; |
| 720 | ni->ni_rxfrag[0] = mfrag; |
| 721 | mfrag = NULL; |
| 722 | } |
| 723 | return mfrag; |
| 724 | } |
| 725 | |
| 726 | static void |
| 727 | ieee80211_deliver_data(struct ieee80211com *ic, |
| 728 | struct ieee80211_node *ni, struct mbuf *m) |
| 729 | { |
| 730 | struct ether_header *eh = mtod(m, struct ether_header *); |
| 731 | struct ifnet *ifp = ic->ic_ifp; |
| 732 | int error; |
| 733 | |
| 734 | /* perform as a bridge within the AP */ |
| 735 | if (ic->ic_opmode == IEEE80211_M_HOSTAP && |
| 736 | (ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) { |
| 737 | struct mbuf *m1 = NULL; |
| 738 | |
| 739 | if (ETHER_IS_MULTICAST(eh->ether_dhost)) { |
| 740 | m1 = m_copypacket(m, M_DONTWAIT); |
| 741 | if (m1 == NULL) |
| 742 | ifp->if_oerrors++; |
| 743 | else |
| 744 | m1->m_flags |= M_MCAST; |
| 745 | } else { |
| 746 | /* |
| 747 | * Check if the destination is known; if so |
| 748 | * and the port is authorized dispatch directly. |
| 749 | */ |
| 750 | struct ieee80211_node *sta = |
| 751 | ieee80211_find_node(&ic->ic_sta, eh->ether_dhost); |
| 752 | if (sta != NULL) { |
| 753 | if (ieee80211_node_is_authorized(sta)) { |
| 754 | /* |
| 755 | * Beware of sending to ourself; this |
| 756 | * needs to happen via the normal |
| 757 | * input path. |
| 758 | */ |
| 759 | if (sta != ic->ic_bss) { |
| 760 | m1 = m; |
| 761 | m = NULL; |
| 762 | } |
| 763 | } else { |
| 764 | ic->ic_stats.is_rx_unauth++; |
| 765 | IEEE80211_NODE_STAT(sta, rx_unauth); |
| 766 | } |
| 767 | ieee80211_free_node(sta); |
| 768 | } |
| 769 | } |
| 770 | if (m1 != NULL) { |
| 771 | int len; |
| 772 | #ifdef ALTQ |
| 773 | if (ALTQ_IS_ENABLED(&ifp->if_snd)) { |
| 774 | altq_etherclassify(&ifp->if_snd, m1); |
| 775 | } |
| 776 | #endif |
| 777 | len = m1->m_pkthdr.len; |
| 778 | IFQ_ENQUEUE(&ifp->if_snd, m1, error); |
| 779 | if (error) { |
| 780 | ifp->if_omcasts++; |
| 781 | m = NULL; |
| 782 | } |
| 783 | ifp->if_obytes += len; |
| 784 | } |
| 785 | } |
| 786 | if (m != NULL) { |
| 787 | /* |
| 788 | * XXX If we forward packet into transmitter of the AP, |
| 789 | * we don't need to duplicate for DLT_EN10MB. |
| 790 | */ |
| 791 | bpf_mtap(ifp, m); |
| 792 | |
| 793 | if (ni->ni_vlan != 0) { |
| 794 | /* attach vlan tag */ |
| 795 | /* XXX goto err? */ |
| 796 | VLAN_INPUT_TAG(ifp, m, ni->ni_vlan, goto out); |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * XXX once ieee80211_input (or rxintr itself) runs in softint |
| 801 | * we have to change here too to use if_input. |
| 802 | */ |
| 803 | KASSERT(ifp->if_percpuq); |
| 804 | if_percpuq_enqueue(ifp->if_percpuq, m); |
| 805 | } |
| 806 | return; |
| 807 | out: |
| 808 | if (m != NULL) { |
| 809 | bpf_mtap3(ic->ic_rawbpf, m); |
| 810 | m_freem(m); |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | static struct mbuf * |
| 815 | ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) |
| 816 | { |
| 817 | struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ |
| 818 | struct ether_header *eh; |
| 819 | struct llc *llc; |
| 820 | |
| 821 | if (m->m_len < hdrlen + sizeof(*llc) && |
| 822 | (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { |
| 823 | /* XXX stat, msg */ |
| 824 | return NULL; |
| 825 | } |
| 826 | memcpy(&wh, mtod(m, void *), hdrlen); |
| 827 | llc = (struct llc *)(mtod(m, char *) + hdrlen); |
| 828 | if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && |
| 829 | llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && |
| 830 | llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { |
| 831 | m_adj(m, hdrlen + sizeof(struct llc) - sizeof(*eh)); |
| 832 | llc = NULL; |
| 833 | } else { |
| 834 | m_adj(m, hdrlen - sizeof(*eh)); |
| 835 | } |
| 836 | eh = mtod(m, struct ether_header *); |
| 837 | switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { |
| 838 | case IEEE80211_FC1_DIR_NODS: |
| 839 | IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); |
| 840 | IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); |
| 841 | break; |
| 842 | case IEEE80211_FC1_DIR_TODS: |
| 843 | IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); |
| 844 | IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); |
| 845 | break; |
| 846 | case IEEE80211_FC1_DIR_FROMDS: |
| 847 | IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); |
| 848 | IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); |
| 849 | break; |
| 850 | case IEEE80211_FC1_DIR_DSTODS: |
| 851 | IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); |
| 852 | IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); |
| 853 | break; |
| 854 | } |
| 855 | #ifdef ALIGNED_POINTER |
| 856 | if (!ALIGNED_POINTER(mtod(m, char *) + sizeof(*eh), u_int32_t)) { |
| 857 | struct mbuf *n, *n0, **np; |
| 858 | char *newdata; |
| 859 | int off, pktlen; |
| 860 | |
| 861 | n0 = NULL; |
| 862 | np = &n0; |
| 863 | off = 0; |
| 864 | pktlen = m->m_pkthdr.len; |
| 865 | while (pktlen > off) { |
| 866 | if (n0 == NULL) { |
| 867 | MGETHDR(n, M_DONTWAIT, MT_DATA); |
| 868 | if (n == NULL) { |
| 869 | m_freem(m); |
| 870 | return NULL; |
| 871 | } |
| 872 | M_MOVE_PKTHDR(n, m); |
| 873 | n->m_len = MHLEN; |
| 874 | } else { |
| 875 | MGET(n, M_DONTWAIT, MT_DATA); |
| 876 | if (n == NULL) { |
| 877 | m_freem(m); |
| 878 | m_freem(n0); |
| 879 | return NULL; |
| 880 | } |
| 881 | n->m_len = MLEN; |
| 882 | } |
| 883 | if (pktlen - off >= MINCLSIZE) { |
| 884 | MCLGET(n, M_DONTWAIT); |
| 885 | if (n->m_flags & M_EXT) |
| 886 | n->m_len = n->m_ext.ext_size; |
| 887 | } |
| 888 | if (n0 == NULL) { |
| 889 | newdata = |
| 890 | (char *)ALIGN(n->m_data + sizeof(*eh)) - |
| 891 | sizeof(*eh); |
| 892 | n->m_len -= newdata - n->m_data; |
| 893 | n->m_data = newdata; |
| 894 | } |
| 895 | if (n->m_len > pktlen - off) |
| 896 | n->m_len = pktlen - off; |
| 897 | m_copydata(m, off, n->m_len, mtod(n, void *)); |
| 898 | off += n->m_len; |
| 899 | *np = n; |
| 900 | np = &n->m_next; |
| 901 | } |
| 902 | m_freem(m); |
| 903 | m = n0; |
| 904 | } |
| 905 | #endif /* ALIGNED_POINTER */ |
| 906 | if (llc != NULL) { |
| 907 | eh = mtod(m, struct ether_header *); |
| 908 | eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); |
| 909 | } |
| 910 | return m; |
| 911 | } |
| 912 | |
| 913 | /* |
| 914 | * Install received rate set information in the node's state block. |
| 915 | */ |
| 916 | int |
| 917 | ieee80211_setup_rates(struct ieee80211_node *ni, |
| 918 | const u_int8_t *rates, const u_int8_t *xrates, int flags) |
| 919 | { |
| 920 | struct ieee80211com *ic = ni->ni_ic; |
| 921 | struct ieee80211_rateset *rs = &ni->ni_rates; |
| 922 | |
| 923 | memset(rs, 0, sizeof(*rs)); |
| 924 | rs->rs_nrates = rates[1]; |
| 925 | memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); |
| 926 | if (xrates != NULL) { |
| 927 | u_int8_t nxrates; |
| 928 | /* |
| 929 | * Tack on 11g extended supported rate element. |
| 930 | */ |
| 931 | nxrates = xrates[1]; |
| 932 | if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { |
| 933 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 934 | nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; |
| 935 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, |
| 936 | "[%s] extended rate set too large;" |
| 937 | " only using %u of %u rates\n" , |
| 938 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), |
| 939 | nxrates, xrates[1]); |
| 940 | ic->ic_stats.is_rx_rstoobig++; |
| 941 | } |
| 942 | memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); |
| 943 | rs->rs_nrates += nxrates; |
| 944 | } |
| 945 | return ieee80211_fix_rate(ni, flags); |
| 946 | } |
| 947 | |
| 948 | static void |
| 949 | ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, |
| 950 | struct ieee80211_node *ni, int , u_int32_t rstamp, |
| 951 | u_int16_t seq, u_int16_t status) |
| 952 | { |
| 953 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 954 | |
| 955 | if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { |
| 956 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 957 | ni->ni_macaddr, "open auth" , |
| 958 | "bad sta auth mode %u" , ni->ni_authmode); |
| 959 | ic->ic_stats.is_rx_bad_auth++; /* XXX */ |
| 960 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 961 | /* XXX hack to workaround calling convention */ |
| 962 | ieee80211_send_error(ic, ni, wh->i_addr2, |
| 963 | IEEE80211_FC0_SUBTYPE_AUTH, |
| 964 | (seq + 1) | (IEEE80211_STATUS_ALG<<16)); |
| 965 | } |
| 966 | return; |
| 967 | } |
| 968 | switch (ic->ic_opmode) { |
| 969 | case IEEE80211_M_IBSS: |
| 970 | case IEEE80211_M_AHDEMO: |
| 971 | case IEEE80211_M_MONITOR: |
| 972 | /* should not come here */ |
| 973 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 974 | ni->ni_macaddr, "open auth" , |
| 975 | "bad operating mode %u" , ic->ic_opmode); |
| 976 | break; |
| 977 | |
| 978 | case IEEE80211_M_HOSTAP: |
| 979 | #ifndef IEEE80211_NO_HOSTAP |
| 980 | if (ic->ic_state != IEEE80211_S_RUN || |
| 981 | seq != IEEE80211_AUTH_OPEN_REQUEST) { |
| 982 | ic->ic_stats.is_rx_bad_auth++; |
| 983 | return; |
| 984 | } |
| 985 | /* always accept open authentication requests */ |
| 986 | if (ni == ic->ic_bss) { |
| 987 | ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); |
| 988 | if (ni == NULL) |
| 989 | return; |
| 990 | } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) |
| 991 | (void) ieee80211_ref_node(ni); |
| 992 | /* |
| 993 | * Mark the node as referenced to reflect that its |
| 994 | * reference count has been bumped to insure it remains |
| 995 | * after the transaction completes. |
| 996 | */ |
| 997 | ni->ni_flags |= IEEE80211_NODE_AREF; |
| 998 | |
| 999 | IEEE80211_SEND_MGMT(ic, ni, |
| 1000 | IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); |
| 1001 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1002 | "[%s] station authenticated (open)\n" , |
| 1003 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); |
| 1004 | /* |
| 1005 | * When 802.1x is not in use mark the port |
| 1006 | * authorized at this point so traffic can flow. |
| 1007 | */ |
| 1008 | if (ni->ni_authmode != IEEE80211_AUTH_8021X) |
| 1009 | ieee80211_node_authorize(ni); |
| 1010 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 1011 | break; |
| 1012 | |
| 1013 | case IEEE80211_M_STA: |
| 1014 | if (ic->ic_state != IEEE80211_S_AUTH || |
| 1015 | seq != IEEE80211_AUTH_OPEN_RESPONSE) { |
| 1016 | ic->ic_stats.is_rx_bad_auth++; |
| 1017 | return; |
| 1018 | } |
| 1019 | if (status != 0) { |
| 1020 | |
| 1021 | IEEE80211_DPRINTF(ic, |
| 1022 | IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1023 | "[%s] open auth failed (reason %d)\n" , |
| 1024 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), |
| 1025 | status); |
| 1026 | /* XXX can this happen? */ |
| 1027 | if (ni != ic->ic_bss) |
| 1028 | ni->ni_fails++; |
| 1029 | ic->ic_stats.is_rx_auth_fail++; |
| 1030 | ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); |
| 1031 | } else |
| 1032 | ieee80211_new_state(ic, IEEE80211_S_ASSOC, |
| 1033 | wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); |
| 1034 | break; |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * Send a management frame error response to the specified |
| 1040 | * station. If ni is associated with the station then use |
| 1041 | * it; otherwise allocate a temporary node suitable for |
| 1042 | * transmitting the frame and then free the reference so |
| 1043 | * it will go away as soon as the frame has been transmitted. |
| 1044 | */ |
| 1045 | static void |
| 1046 | ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, |
| 1047 | const u_int8_t *mac, int subtype, int arg) |
| 1048 | { |
| 1049 | int istmp; |
| 1050 | |
| 1051 | if (ni == ic->ic_bss) { |
| 1052 | ni = ieee80211_tmp_node(ic, mac); |
| 1053 | if (ni == NULL) { |
| 1054 | /* XXX msg */ |
| 1055 | return; |
| 1056 | } |
| 1057 | istmp = 1; |
| 1058 | } else |
| 1059 | istmp = 0; |
| 1060 | IEEE80211_SEND_MGMT(ic, ni, subtype, arg); |
| 1061 | if (istmp) |
| 1062 | ieee80211_free_node(ni); |
| 1063 | } |
| 1064 | |
| 1065 | static int |
| 1066 | alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) |
| 1067 | { |
| 1068 | if (ni->ni_challenge == NULL) |
| 1069 | ni->ni_challenge = malloc(IEEE80211_CHALLENGE_LEN, |
| 1070 | M_DEVBUF, M_NOWAIT); |
| 1071 | if (ni->ni_challenge == NULL) { |
| 1072 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 1073 | |
| 1074 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1075 | "[%s] shared key challenge alloc failed\n" , |
| 1076 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); |
| 1077 | /* XXX statistic */ |
| 1078 | } |
| 1079 | return (ni->ni_challenge != NULL); |
| 1080 | } |
| 1081 | |
| 1082 | /* XXX TODO: add statistics */ |
| 1083 | static void |
| 1084 | ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, |
| 1085 | u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int , |
| 1086 | u_int32_t rstamp, u_int16_t seq, u_int16_t status) |
| 1087 | { |
| 1088 | u_int8_t *challenge; |
| 1089 | int estatus; |
| 1090 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 1091 | |
| 1092 | /* |
| 1093 | * NB: this can happen as we allow pre-shared key |
| 1094 | * authentication to be enabled w/o wep being turned |
| 1095 | * on so that configuration of these can be done |
| 1096 | * in any order. It may be better to enforce the |
| 1097 | * ordering in which case this check would just be |
| 1098 | * for sanity/consistency. |
| 1099 | */ |
| 1100 | if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { |
| 1101 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1102 | ni->ni_macaddr, "shared key auth" , |
| 1103 | "%s" , " PRIVACY is disabled" ); |
| 1104 | estatus = IEEE80211_STATUS_ALG; |
| 1105 | goto bad; |
| 1106 | } |
| 1107 | /* |
| 1108 | * Pre-shared key authentication is evil; accept |
| 1109 | * it only if explicitly configured (it is supported |
| 1110 | * mainly for compatibility with clients like OS X). |
| 1111 | */ |
| 1112 | if (ni->ni_authmode != IEEE80211_AUTH_AUTO && |
| 1113 | ni->ni_authmode != IEEE80211_AUTH_SHARED) { |
| 1114 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1115 | ni->ni_macaddr, "shared key auth" , |
| 1116 | "bad sta auth mode %u" , ni->ni_authmode); |
| 1117 | ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ |
| 1118 | estatus = IEEE80211_STATUS_ALG; |
| 1119 | goto bad; |
| 1120 | } |
| 1121 | |
| 1122 | challenge = NULL; |
| 1123 | if (frm + 1 < efrm) { |
| 1124 | if ((frm[1] + 2) > (efrm - frm)) { |
| 1125 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1126 | ni->ni_macaddr, "shared key auth" , |
| 1127 | "ie %d/%d too long" , |
| 1128 | frm[0], (frm[1] + 2) - (efrm - frm)); |
| 1129 | ic->ic_stats.is_rx_bad_auth++; |
| 1130 | estatus = IEEE80211_STATUS_CHALLENGE; |
| 1131 | goto bad; |
| 1132 | } |
| 1133 | if (*frm == IEEE80211_ELEMID_CHALLENGE) |
| 1134 | challenge = frm; |
| 1135 | frm += frm[1] + 2; |
| 1136 | } |
| 1137 | switch (seq) { |
| 1138 | case IEEE80211_AUTH_SHARED_CHALLENGE: |
| 1139 | case IEEE80211_AUTH_SHARED_RESPONSE: |
| 1140 | if (challenge == NULL) { |
| 1141 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1142 | ni->ni_macaddr, "shared key auth" , |
| 1143 | "%s" , "no challenge" ); |
| 1144 | ic->ic_stats.is_rx_bad_auth++; |
| 1145 | estatus = IEEE80211_STATUS_CHALLENGE; |
| 1146 | goto bad; |
| 1147 | } |
| 1148 | if (challenge[1] != IEEE80211_CHALLENGE_LEN) { |
| 1149 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1150 | ni->ni_macaddr, "shared key auth" , |
| 1151 | "bad challenge len %d" , challenge[1]); |
| 1152 | ic->ic_stats.is_rx_bad_auth++; |
| 1153 | estatus = IEEE80211_STATUS_CHALLENGE; |
| 1154 | goto bad; |
| 1155 | } |
| 1156 | default: |
| 1157 | break; |
| 1158 | } |
| 1159 | switch (ic->ic_opmode) { |
| 1160 | case IEEE80211_M_MONITOR: |
| 1161 | case IEEE80211_M_AHDEMO: |
| 1162 | case IEEE80211_M_IBSS: |
| 1163 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1164 | ni->ni_macaddr, "shared key auth" , |
| 1165 | "bad operating mode %u" , ic->ic_opmode); |
| 1166 | return; |
| 1167 | case IEEE80211_M_HOSTAP: |
| 1168 | #ifndef IEEE80211_NO_HOSTAP |
| 1169 | { |
| 1170 | int allocbs; |
| 1171 | if (ic->ic_state != IEEE80211_S_RUN) { |
| 1172 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1173 | ni->ni_macaddr, "shared key auth" , |
| 1174 | "bad state %u" , ic->ic_state); |
| 1175 | estatus = IEEE80211_STATUS_ALG; /* XXX */ |
| 1176 | goto bad; |
| 1177 | } |
| 1178 | switch (seq) { |
| 1179 | case IEEE80211_AUTH_SHARED_REQUEST: |
| 1180 | if (ni == ic->ic_bss) { |
| 1181 | ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); |
| 1182 | if (ni == NULL) { |
| 1183 | /* NB: no way to return an error */ |
| 1184 | return; |
| 1185 | } |
| 1186 | allocbs = 1; |
| 1187 | } else { |
| 1188 | if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) |
| 1189 | (void) ieee80211_ref_node(ni); |
| 1190 | allocbs = 0; |
| 1191 | } |
| 1192 | __USE(allocbs); |
| 1193 | /* |
| 1194 | * Mark the node as referenced to reflect that its |
| 1195 | * reference count has been bumped to insure it remains |
| 1196 | * after the transaction completes. |
| 1197 | */ |
| 1198 | ni->ni_flags |= IEEE80211_NODE_AREF; |
| 1199 | ni->ni_rssi = rssi; |
| 1200 | ni->ni_rstamp = rstamp; |
| 1201 | if (!alloc_challenge(ic, ni)) { |
| 1202 | /* NB: don't return error so they rexmit */ |
| 1203 | return; |
| 1204 | } |
| 1205 | get_random_bytes(ni->ni_challenge, |
| 1206 | IEEE80211_CHALLENGE_LEN); |
| 1207 | IEEE80211_DPRINTF(ic, |
| 1208 | IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1209 | "[%s] shared key %sauth request\n" , |
| 1210 | ether_snprintf(ebuf, sizeof(ebuf), |
| 1211 | ni->ni_macaddr), |
| 1212 | allocbs ? "" : "re" ); |
| 1213 | break; |
| 1214 | case IEEE80211_AUTH_SHARED_RESPONSE: |
| 1215 | if (ni == ic->ic_bss) { |
| 1216 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1217 | ni->ni_macaddr, "shared key response" , |
| 1218 | "%s" , "unknown station" ); |
| 1219 | /* NB: don't send a response */ |
| 1220 | return; |
| 1221 | } |
| 1222 | if (ni->ni_challenge == NULL) { |
| 1223 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1224 | ni->ni_macaddr, "shared key response" , |
| 1225 | "%s" , "no challenge recorded" ); |
| 1226 | ic->ic_stats.is_rx_bad_auth++; |
| 1227 | estatus = IEEE80211_STATUS_CHALLENGE; |
| 1228 | goto bad; |
| 1229 | } |
| 1230 | if (memcmp(ni->ni_challenge, &challenge[2], |
| 1231 | challenge[1]) != 0) { |
| 1232 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1233 | ni->ni_macaddr, "shared key response" , |
| 1234 | "%s" , "challenge mismatch" ); |
| 1235 | ic->ic_stats.is_rx_auth_fail++; |
| 1236 | estatus = IEEE80211_STATUS_CHALLENGE; |
| 1237 | goto bad; |
| 1238 | } |
| 1239 | IEEE80211_DPRINTF(ic, |
| 1240 | IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1241 | "[%s] station authenticated (shared key)\n" , |
| 1242 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); |
| 1243 | ieee80211_node_authorize(ni); |
| 1244 | break; |
| 1245 | default: |
| 1246 | IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, |
| 1247 | ni->ni_macaddr, "shared key auth" , |
| 1248 | "bad seq %d" , seq); |
| 1249 | ic->ic_stats.is_rx_bad_auth++; |
| 1250 | estatus = IEEE80211_STATUS_SEQUENCE; |
| 1251 | goto bad; |
| 1252 | } |
| 1253 | IEEE80211_SEND_MGMT(ic, ni, |
| 1254 | IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); |
| 1255 | } |
| 1256 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 1257 | break; |
| 1258 | |
| 1259 | case IEEE80211_M_STA: |
| 1260 | if (ic->ic_state != IEEE80211_S_AUTH) |
| 1261 | return; |
| 1262 | switch (seq) { |
| 1263 | case IEEE80211_AUTH_SHARED_PASS: |
| 1264 | if (ni->ni_challenge != NULL) { |
| 1265 | free(ni->ni_challenge, M_DEVBUF); |
| 1266 | ni->ni_challenge = NULL; |
| 1267 | } |
| 1268 | if (status != 0) { |
| 1269 | IEEE80211_DPRINTF(ic, |
| 1270 | IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, |
| 1271 | "[%s] shared key auth failed (reason %d)\n" , |
| 1272 | ether_snprintf(ebuf, sizeof(ebuf), |
| 1273 | ieee80211_getbssid(ic, wh)), |
| 1274 | status); |
| 1275 | /* XXX can this happen? */ |
| 1276 | if (ni != ic->ic_bss) |
| 1277 | ni->ni_fails++; |
| 1278 | ic->ic_stats.is_rx_auth_fail++; |
| 1279 | return; |
| 1280 | } |
| 1281 | ieee80211_new_state(ic, IEEE80211_S_ASSOC, |
| 1282 | wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); |
| 1283 | break; |
| 1284 | case IEEE80211_AUTH_SHARED_CHALLENGE: |
| 1285 | if (!alloc_challenge(ic, ni)) |
| 1286 | return; |
| 1287 | /* XXX could optimize by passing recvd challenge */ |
| 1288 | memcpy(ni->ni_challenge, &challenge[2], challenge[1]); |
| 1289 | IEEE80211_SEND_MGMT(ic, ni, |
| 1290 | IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); |
| 1291 | break; |
| 1292 | default: |
| 1293 | IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, |
| 1294 | wh, "shared key auth" , "bad seq %d" , seq); |
| 1295 | ic->ic_stats.is_rx_bad_auth++; |
| 1296 | return; |
| 1297 | } |
| 1298 | break; |
| 1299 | } |
| 1300 | return; |
| 1301 | bad: |
| 1302 | #ifndef IEEE80211_NO_HOSTAP |
| 1303 | /* |
| 1304 | * Send an error response; but only when operating as an AP. |
| 1305 | */ |
| 1306 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 1307 | /* XXX hack to workaround calling convention */ |
| 1308 | ieee80211_send_error(ic, ni, wh->i_addr2, |
| 1309 | IEEE80211_FC0_SUBTYPE_AUTH, |
| 1310 | (seq + 1) | (estatus<<16)); |
| 1311 | } else if (ic->ic_opmode == IEEE80211_M_STA) { |
| 1312 | /* |
| 1313 | * Kick the state machine. This short-circuits |
| 1314 | * using the mgt frame timeout to trigger the |
| 1315 | * state transition. |
| 1316 | */ |
| 1317 | if (ic->ic_state == IEEE80211_S_AUTH) |
| 1318 | ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); |
| 1319 | } |
| 1320 | #else |
| 1321 | ; |
| 1322 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 1323 | } |
| 1324 | |
| 1325 | /* Verify the existence and length of __elem or get out. */ |
| 1326 | #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ |
| 1327 | if ((__elem) == NULL) { \ |
| 1328 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ |
| 1329 | wh, ieee80211_mgt_subtype_name[subtype >> \ |
| 1330 | IEEE80211_FC0_SUBTYPE_SHIFT], \ |
| 1331 | "%s", "no " #__elem ); \ |
| 1332 | ic->ic_stats.is_rx_elem_missing++; \ |
| 1333 | return; \ |
| 1334 | } \ |
| 1335 | if ((__elem)[1] > (__maxlen)) { \ |
| 1336 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ |
| 1337 | wh, ieee80211_mgt_subtype_name[subtype >> \ |
| 1338 | IEEE80211_FC0_SUBTYPE_SHIFT], \ |
| 1339 | "bad " #__elem " len %d", (__elem)[1]); \ |
| 1340 | ic->ic_stats.is_rx_elem_toobig++; \ |
| 1341 | return; \ |
| 1342 | } \ |
| 1343 | } while (0) |
| 1344 | |
| 1345 | #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \ |
| 1346 | if ((_len) < (_minlen)) { \ |
| 1347 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, \ |
| 1348 | wh, ieee80211_mgt_subtype_name[subtype >> \ |
| 1349 | IEEE80211_FC0_SUBTYPE_SHIFT], \ |
| 1350 | "%s", "ie too short"); \ |
| 1351 | ic->ic_stats.is_rx_elem_toosmall++; \ |
| 1352 | return; \ |
| 1353 | } \ |
| 1354 | } while (0) |
| 1355 | |
| 1356 | #ifdef IEEE80211_DEBUG |
| 1357 | static void |
| 1358 | ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, |
| 1359 | u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_t *ssid) |
| 1360 | { |
| 1361 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 1362 | |
| 1363 | printf("[%s] discard %s frame, ssid mismatch: " , |
| 1364 | ether_snprintf(ebuf, sizeof(ebuf), mac), tag); |
| 1365 | ieee80211_print_essid(ssid + 2, ssid[1]); |
| 1366 | printf("\n" ); |
| 1367 | } |
| 1368 | |
| 1369 | #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ |
| 1370 | if ((_ssid)[1] != 0 && \ |
| 1371 | ((_ssid)[1] != (_ni)->ni_esslen || \ |
| 1372 | memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ |
| 1373 | if (ieee80211_msg_input(ic)) \ |
| 1374 | ieee80211_ssid_mismatch(ic, \ |
| 1375 | ieee80211_mgt_subtype_name[subtype >> \ |
| 1376 | IEEE80211_FC0_SUBTYPE_SHIFT], \ |
| 1377 | wh->i_addr2, _ssid); \ |
| 1378 | ic->ic_stats.is_rx_ssidmismatch++; \ |
| 1379 | return; \ |
| 1380 | } \ |
| 1381 | } while (0) |
| 1382 | #else /* !IEEE80211_DEBUG */ |
| 1383 | #define IEEE80211_VERIFY_SSID(_ni, _ssid) do { \ |
| 1384 | if ((_ssid)[1] != 0 && \ |
| 1385 | ((_ssid)[1] != (_ni)->ni_esslen || \ |
| 1386 | memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ |
| 1387 | ic->ic_stats.is_rx_ssidmismatch++; \ |
| 1388 | return; \ |
| 1389 | } \ |
| 1390 | } while (0) |
| 1391 | #endif /* !IEEE80211_DEBUG */ |
| 1392 | |
| 1393 | /* unaligned little endian access */ |
| 1394 | #define LE_READ_2(p) \ |
| 1395 | ((u_int16_t) \ |
| 1396 | ((((const u_int8_t *)(p))[0] ) | \ |
| 1397 | (((const u_int8_t *)(p))[1] << 8))) |
| 1398 | #define LE_READ_4(p) \ |
| 1399 | ((u_int32_t) \ |
| 1400 | ((((const u_int8_t *)(p))[0] ) | \ |
| 1401 | (((const u_int8_t *)(p))[1] << 8) | \ |
| 1402 | (((const u_int8_t *)(p))[2] << 16) | \ |
| 1403 | (((const u_int8_t *)(p))[3] << 24))) |
| 1404 | |
| 1405 | static __inline int |
| 1406 | iswpaoui(const u_int8_t *frm) |
| 1407 | { |
| 1408 | return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI); |
| 1409 | } |
| 1410 | |
| 1411 | static __inline int |
| 1412 | iswmeoui(const u_int8_t *frm) |
| 1413 | { |
| 1414 | return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI); |
| 1415 | } |
| 1416 | |
| 1417 | static __inline int |
| 1418 | iswmeparam(const u_int8_t *frm) |
| 1419 | { |
| 1420 | return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && |
| 1421 | frm[6] == WME_PARAM_OUI_SUBTYPE; |
| 1422 | } |
| 1423 | |
| 1424 | static __inline int |
| 1425 | iswmeinfo(const u_int8_t *frm) |
| 1426 | { |
| 1427 | return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) && |
| 1428 | frm[6] == WME_INFO_OUI_SUBTYPE; |
| 1429 | } |
| 1430 | |
| 1431 | /* |
| 1432 | * Convert a WPA cipher selector OUI to an internal |
| 1433 | * cipher algorithm. Where appropriate we also |
| 1434 | * record any key length. |
| 1435 | */ |
| 1436 | static int |
| 1437 | wpa_cipher(u_int8_t *sel, u_int8_t *keylen) |
| 1438 | { |
| 1439 | #define WPA_SEL(x) (((x)<<24)|WPA_OUI) |
| 1440 | u_int32_t w = LE_READ_4(sel); |
| 1441 | |
| 1442 | switch (w) { |
| 1443 | case WPA_SEL(WPA_CSE_NULL): |
| 1444 | return IEEE80211_CIPHER_NONE; |
| 1445 | case WPA_SEL(WPA_CSE_WEP40): |
| 1446 | if (keylen) |
| 1447 | *keylen = 40 / NBBY; |
| 1448 | return IEEE80211_CIPHER_WEP; |
| 1449 | case WPA_SEL(WPA_CSE_WEP104): |
| 1450 | if (keylen) |
| 1451 | *keylen = 104 / NBBY; |
| 1452 | return IEEE80211_CIPHER_WEP; |
| 1453 | case WPA_SEL(WPA_CSE_TKIP): |
| 1454 | return IEEE80211_CIPHER_TKIP; |
| 1455 | case WPA_SEL(WPA_CSE_CCMP): |
| 1456 | return IEEE80211_CIPHER_AES_CCM; |
| 1457 | } |
| 1458 | return 32; /* NB: so 1<< is discarded */ |
| 1459 | #undef WPA_SEL |
| 1460 | } |
| 1461 | |
| 1462 | /* |
| 1463 | * Convert a WPA key management/authentication algorithm |
| 1464 | * to an internal code. |
| 1465 | */ |
| 1466 | static int |
| 1467 | wpa_keymgmt(u_int8_t *sel) |
| 1468 | { |
| 1469 | #define WPA_SEL(x) (((x)<<24)|WPA_OUI) |
| 1470 | u_int32_t w = LE_READ_4(sel); |
| 1471 | |
| 1472 | switch (w) { |
| 1473 | case WPA_SEL(WPA_ASE_8021X_UNSPEC): |
| 1474 | return WPA_ASE_8021X_UNSPEC; |
| 1475 | case WPA_SEL(WPA_ASE_8021X_PSK): |
| 1476 | return WPA_ASE_8021X_PSK; |
| 1477 | case WPA_SEL(WPA_ASE_NONE): |
| 1478 | return WPA_ASE_NONE; |
| 1479 | } |
| 1480 | return 0; /* NB: so is discarded */ |
| 1481 | #undef WPA_SEL |
| 1482 | } |
| 1483 | |
| 1484 | /* |
| 1485 | * Parse a WPA information element to collect parameters |
| 1486 | * and validate the parameters against what has been |
| 1487 | * configured for the system. |
| 1488 | */ |
| 1489 | static int |
| 1490 | ieee80211_parse_wpa(struct ieee80211com *ic, u_int8_t *frm, |
| 1491 | struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) |
| 1492 | { |
| 1493 | u_int8_t len = frm[1]; |
| 1494 | u_int32_t w; |
| 1495 | int n; |
| 1496 | |
| 1497 | /* |
| 1498 | * Check the length once for fixed parts: OUI, type, |
| 1499 | * version, mcast cipher, and 2 selector counts. |
| 1500 | * Other, variable-length data, must be checked separately. |
| 1501 | */ |
| 1502 | if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { |
| 1503 | IEEE80211_DISCARD_IE(ic, |
| 1504 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1505 | wh, "WPA" , "not WPA, flags 0x%x" , ic->ic_flags); |
| 1506 | return IEEE80211_REASON_IE_INVALID; |
| 1507 | } |
| 1508 | if (len < 14) { |
| 1509 | IEEE80211_DISCARD_IE(ic, |
| 1510 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1511 | wh, "WPA" , "too short, len %u" , len); |
| 1512 | return IEEE80211_REASON_IE_INVALID; |
| 1513 | } |
| 1514 | frm += 6, len -= 4; /* NB: len is payload only */ |
| 1515 | /* NB: iswapoui already validated the OUI and type */ |
| 1516 | w = LE_READ_2(frm); |
| 1517 | if (w != WPA_VERSION) { |
| 1518 | IEEE80211_DISCARD_IE(ic, |
| 1519 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1520 | wh, "WPA" , "bad version %u" , w); |
| 1521 | return IEEE80211_REASON_IE_INVALID; |
| 1522 | } |
| 1523 | frm += 2, len -= 2; |
| 1524 | |
| 1525 | /* multicast/group cipher */ |
| 1526 | w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); |
| 1527 | if (w != rsn->rsn_mcastcipher) { |
| 1528 | IEEE80211_DISCARD_IE(ic, |
| 1529 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1530 | wh, "WPA" , "mcast cipher mismatch; got %u, expected %u" , |
| 1531 | w, rsn->rsn_mcastcipher); |
| 1532 | return IEEE80211_REASON_IE_INVALID; |
| 1533 | } |
| 1534 | frm += 4, len -= 4; |
| 1535 | |
| 1536 | /* unicast ciphers */ |
| 1537 | n = LE_READ_2(frm); |
| 1538 | frm += 2, len -= 2; |
| 1539 | if (len < n*4+2) { |
| 1540 | IEEE80211_DISCARD_IE(ic, |
| 1541 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1542 | wh, "WPA" , "ucast cipher data too short; len %u, n %u" , |
| 1543 | len, n); |
| 1544 | return IEEE80211_REASON_IE_INVALID; |
| 1545 | } |
| 1546 | w = 0; |
| 1547 | for (; n > 0; n--) { |
| 1548 | w |= 1<<wpa_cipher(frm, &rsn->rsn_ucastkeylen); |
| 1549 | frm += 4, len -= 4; |
| 1550 | } |
| 1551 | w &= rsn->rsn_ucastcipherset; |
| 1552 | if (w == 0) { |
| 1553 | IEEE80211_DISCARD_IE(ic, |
| 1554 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1555 | wh, "WPA" , "%s" , "ucast cipher set empty" ); |
| 1556 | return IEEE80211_REASON_IE_INVALID; |
| 1557 | } |
| 1558 | if (w & (1<<IEEE80211_CIPHER_TKIP)) |
| 1559 | rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; |
| 1560 | else |
| 1561 | rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; |
| 1562 | |
| 1563 | /* key management algorithms */ |
| 1564 | n = LE_READ_2(frm); |
| 1565 | frm += 2, len -= 2; |
| 1566 | if (len < n*4) { |
| 1567 | IEEE80211_DISCARD_IE(ic, |
| 1568 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1569 | wh, "WPA" , "key mgmt alg data too short; len %u, n %u" , |
| 1570 | len, n); |
| 1571 | return IEEE80211_REASON_IE_INVALID; |
| 1572 | } |
| 1573 | w = 0; |
| 1574 | for (; n > 0; n--) { |
| 1575 | w |= wpa_keymgmt(frm); |
| 1576 | frm += 4, len -= 4; |
| 1577 | } |
| 1578 | w &= rsn->rsn_keymgmtset; |
| 1579 | if (w == 0) { |
| 1580 | IEEE80211_DISCARD_IE(ic, |
| 1581 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1582 | wh, "WPA" , "%s" , "no acceptable key mgmt alg" ); |
| 1583 | return IEEE80211_REASON_IE_INVALID; |
| 1584 | } |
| 1585 | if (w & WPA_ASE_8021X_UNSPEC) |
| 1586 | rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; |
| 1587 | else |
| 1588 | rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; |
| 1589 | |
| 1590 | if (len > 2) /* optional capabilities */ |
| 1591 | rsn->rsn_caps = LE_READ_2(frm); |
| 1592 | |
| 1593 | return 0; |
| 1594 | } |
| 1595 | |
| 1596 | /* |
| 1597 | * Convert an RSN cipher selector OUI to an internal |
| 1598 | * cipher algorithm. Where appropriate we also |
| 1599 | * record any key length. |
| 1600 | */ |
| 1601 | static int |
| 1602 | rsn_cipher(u_int8_t *sel, u_int8_t *keylen) |
| 1603 | { |
| 1604 | #define RSN_SEL(x) (((x)<<24)|RSN_OUI) |
| 1605 | u_int32_t w = LE_READ_4(sel); |
| 1606 | |
| 1607 | switch (w) { |
| 1608 | case RSN_SEL(RSN_CSE_NULL): |
| 1609 | return IEEE80211_CIPHER_NONE; |
| 1610 | case RSN_SEL(RSN_CSE_WEP40): |
| 1611 | if (keylen) |
| 1612 | *keylen = 40 / NBBY; |
| 1613 | return IEEE80211_CIPHER_WEP; |
| 1614 | case RSN_SEL(RSN_CSE_WEP104): |
| 1615 | if (keylen) |
| 1616 | *keylen = 104 / NBBY; |
| 1617 | return IEEE80211_CIPHER_WEP; |
| 1618 | case RSN_SEL(RSN_CSE_TKIP): |
| 1619 | return IEEE80211_CIPHER_TKIP; |
| 1620 | case RSN_SEL(RSN_CSE_CCMP): |
| 1621 | return IEEE80211_CIPHER_AES_CCM; |
| 1622 | case RSN_SEL(RSN_CSE_WRAP): |
| 1623 | return IEEE80211_CIPHER_AES_OCB; |
| 1624 | } |
| 1625 | return 32; /* NB: so 1<< is discarded */ |
| 1626 | #undef WPA_SEL |
| 1627 | } |
| 1628 | |
| 1629 | /* |
| 1630 | * Convert an RSN key management/authentication algorithm |
| 1631 | * to an internal code. |
| 1632 | */ |
| 1633 | static int |
| 1634 | rsn_keymgmt(u_int8_t *sel) |
| 1635 | { |
| 1636 | #define RSN_SEL(x) (((x)<<24)|RSN_OUI) |
| 1637 | u_int32_t w = LE_READ_4(sel); |
| 1638 | |
| 1639 | switch (w) { |
| 1640 | case RSN_SEL(RSN_ASE_8021X_UNSPEC): |
| 1641 | return RSN_ASE_8021X_UNSPEC; |
| 1642 | case RSN_SEL(RSN_ASE_8021X_PSK): |
| 1643 | return RSN_ASE_8021X_PSK; |
| 1644 | case RSN_SEL(RSN_ASE_NONE): |
| 1645 | return RSN_ASE_NONE; |
| 1646 | } |
| 1647 | return 0; /* NB: so is discarded */ |
| 1648 | #undef RSN_SEL |
| 1649 | } |
| 1650 | |
| 1651 | /* |
| 1652 | * Parse a WPA/RSN information element to collect parameters |
| 1653 | * and validate the parameters against what has been |
| 1654 | * configured for the system. |
| 1655 | */ |
| 1656 | static int |
| 1657 | ieee80211_parse_rsn(struct ieee80211com *ic, u_int8_t *frm, |
| 1658 | struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) |
| 1659 | { |
| 1660 | u_int8_t len = frm[1]; |
| 1661 | u_int32_t w; |
| 1662 | int n; |
| 1663 | |
| 1664 | /* |
| 1665 | * Check the length once for fixed parts: |
| 1666 | * version, mcast cipher, and 2 selector counts. |
| 1667 | * Other, variable-length data, must be checked separately. |
| 1668 | */ |
| 1669 | if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { |
| 1670 | IEEE80211_DISCARD_IE(ic, |
| 1671 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1672 | wh, "WPA" , "not RSN, flags 0x%x" , ic->ic_flags); |
| 1673 | return IEEE80211_REASON_IE_INVALID; |
| 1674 | } |
| 1675 | if (len < 10) { |
| 1676 | IEEE80211_DISCARD_IE(ic, |
| 1677 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1678 | wh, "RSN" , "too short, len %u" , len); |
| 1679 | return IEEE80211_REASON_IE_INVALID; |
| 1680 | } |
| 1681 | frm += 2; |
| 1682 | w = LE_READ_2(frm); |
| 1683 | if (w != RSN_VERSION) { |
| 1684 | IEEE80211_DISCARD_IE(ic, |
| 1685 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1686 | wh, "RSN" , "bad version %u" , w); |
| 1687 | return IEEE80211_REASON_IE_INVALID; |
| 1688 | } |
| 1689 | frm += 2, len -= 2; |
| 1690 | |
| 1691 | /* multicast/group cipher */ |
| 1692 | w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); |
| 1693 | if (w != rsn->rsn_mcastcipher) { |
| 1694 | IEEE80211_DISCARD_IE(ic, |
| 1695 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1696 | wh, "RSN" , "mcast cipher mismatch; got %u, expected %u" , |
| 1697 | w, rsn->rsn_mcastcipher); |
| 1698 | return IEEE80211_REASON_IE_INVALID; |
| 1699 | } |
| 1700 | frm += 4, len -= 4; |
| 1701 | |
| 1702 | /* unicast ciphers */ |
| 1703 | n = LE_READ_2(frm); |
| 1704 | frm += 2, len -= 2; |
| 1705 | if (len < n*4+2) { |
| 1706 | IEEE80211_DISCARD_IE(ic, |
| 1707 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1708 | wh, "RSN" , "ucast cipher data too short; len %u, n %u" , |
| 1709 | len, n); |
| 1710 | return IEEE80211_REASON_IE_INVALID; |
| 1711 | } |
| 1712 | w = 0; |
| 1713 | for (; n > 0; n--) { |
| 1714 | w |= 1<<rsn_cipher(frm, &rsn->rsn_ucastkeylen); |
| 1715 | frm += 4, len -= 4; |
| 1716 | } |
| 1717 | w &= rsn->rsn_ucastcipherset; |
| 1718 | if (w == 0) { |
| 1719 | IEEE80211_DISCARD_IE(ic, |
| 1720 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1721 | wh, "RSN" , "%s" , "ucast cipher set empty" ); |
| 1722 | return IEEE80211_REASON_IE_INVALID; |
| 1723 | } |
| 1724 | if (w & (1<<IEEE80211_CIPHER_TKIP)) |
| 1725 | rsn->rsn_ucastcipher = IEEE80211_CIPHER_TKIP; |
| 1726 | else |
| 1727 | rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; |
| 1728 | |
| 1729 | /* key management algorithms */ |
| 1730 | n = LE_READ_2(frm); |
| 1731 | frm += 2, len -= 2; |
| 1732 | if (len < n*4) { |
| 1733 | IEEE80211_DISCARD_IE(ic, |
| 1734 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1735 | wh, "RSN" , "key mgmt alg data too short; len %u, n %u" , |
| 1736 | len, n); |
| 1737 | return IEEE80211_REASON_IE_INVALID; |
| 1738 | } |
| 1739 | w = 0; |
| 1740 | for (; n > 0; n--) { |
| 1741 | w |= rsn_keymgmt(frm); |
| 1742 | frm += 4, len -= 4; |
| 1743 | } |
| 1744 | w &= rsn->rsn_keymgmtset; |
| 1745 | if (w == 0) { |
| 1746 | IEEE80211_DISCARD_IE(ic, |
| 1747 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, |
| 1748 | wh, "RSN" , "%s" , "no acceptable key mgmt alg" ); |
| 1749 | return IEEE80211_REASON_IE_INVALID; |
| 1750 | } |
| 1751 | if (w & RSN_ASE_8021X_UNSPEC) |
| 1752 | rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; |
| 1753 | else |
| 1754 | rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; |
| 1755 | |
| 1756 | /* optional RSN capabilities */ |
| 1757 | if (len > 2) |
| 1758 | rsn->rsn_caps = LE_READ_2(frm); |
| 1759 | /* XXXPMKID */ |
| 1760 | |
| 1761 | return 0; |
| 1762 | } |
| 1763 | |
| 1764 | static int |
| 1765 | ieee80211_parse_wmeparams(struct ieee80211com *ic, u_int8_t *frm, |
| 1766 | const struct ieee80211_frame *wh) |
| 1767 | { |
| 1768 | #define MS(_v, _f) (((_v) & _f) >> _f##_S) |
| 1769 | struct ieee80211_wme_state *wme = &ic->ic_wme; |
| 1770 | u_int len = frm[1], qosinfo; |
| 1771 | int i; |
| 1772 | |
| 1773 | if (len < sizeof(struct ieee80211_wme_param)-2) { |
| 1774 | IEEE80211_DISCARD_IE(ic, |
| 1775 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, |
| 1776 | wh, "WME" , "too short, len %u" , len); |
| 1777 | return -1; |
| 1778 | } |
| 1779 | qosinfo = frm[offsetof(struct ieee80211_wme_param, param_qosInfo)]; |
| 1780 | qosinfo &= WME_QOSINFO_COUNT; |
| 1781 | /* XXX do proper check for wraparound */ |
| 1782 | if (qosinfo == wme->wme_wmeChanParams.cap_info) |
| 1783 | return 0; |
| 1784 | frm += offsetof(struct ieee80211_wme_param, params_acParams); |
| 1785 | for (i = 0; i < WME_NUM_AC; i++) { |
| 1786 | struct wmeParams *wmep = |
| 1787 | &wme->wme_wmeChanParams.cap_wmeParams[i]; |
| 1788 | /* NB: ACI not used */ |
| 1789 | wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); |
| 1790 | wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); |
| 1791 | wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); |
| 1792 | wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); |
| 1793 | wmep->wmep_txopLimit = LE_READ_2(frm+2); |
| 1794 | frm += 4; |
| 1795 | } |
| 1796 | wme->wme_wmeChanParams.cap_info = qosinfo; |
| 1797 | return 1; |
| 1798 | #undef MS |
| 1799 | } |
| 1800 | |
| 1801 | void |
| 1802 | ieee80211_saveie(u_int8_t **iep, const u_int8_t *ie) |
| 1803 | { |
| 1804 | u_int ielen = ie[1]+2; |
| 1805 | /* |
| 1806 | * Record information element for later use. |
| 1807 | */ |
| 1808 | if (*iep == NULL || (*iep)[1] != ie[1]) { |
| 1809 | if (*iep != NULL) |
| 1810 | free(*iep, M_DEVBUF); |
| 1811 | *iep = malloc(ielen, M_DEVBUF, M_NOWAIT); |
| 1812 | } |
| 1813 | if (*iep != NULL) |
| 1814 | memcpy(*iep, ie, ielen); |
| 1815 | /* XXX note failure */ |
| 1816 | } |
| 1817 | |
| 1818 | static void |
| 1819 | ieee80211_update_adhoc_node(struct ieee80211com *ic, struct ieee80211_node *ni, |
| 1820 | struct ieee80211_frame *wh, struct ieee80211_scanparams *scan, int , |
| 1821 | u_int32_t rstamp) |
| 1822 | { |
| 1823 | if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { |
| 1824 | /* |
| 1825 | * Create a new entry in the neighbor table. |
| 1826 | * Records the TSF. |
| 1827 | */ |
| 1828 | if ((ni = ieee80211_add_neighbor(ic, wh, scan)) == NULL) |
| 1829 | return; |
| 1830 | } else if (ni->ni_capinfo == 0) { |
| 1831 | /* |
| 1832 | * Initialize a node that was "faked up." Records |
| 1833 | * the TSF. |
| 1834 | * |
| 1835 | * No need to check for a change of BSSID: ni could |
| 1836 | * not have been the IBSS (ic_bss) |
| 1837 | */ |
| 1838 | ieee80211_init_neighbor(ic, ni, wh, scan, 0); |
| 1839 | } else { |
| 1840 | /* Record TSF for potential resync. */ |
| 1841 | memcpy(ni->ni_tstamp.data, scan->tstamp, sizeof(ni->ni_tstamp)); |
| 1842 | } |
| 1843 | |
| 1844 | ni->ni_rssi = rssi; |
| 1845 | ni->ni_rstamp = rstamp; |
| 1846 | |
| 1847 | /* Mark a neighbor's change of BSSID. */ |
| 1848 | if (IEEE80211_ADDR_EQ(wh->i_addr3, ni->ni_bssid)) |
| 1849 | return; |
| 1850 | |
| 1851 | IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); |
| 1852 | |
| 1853 | if (ni != ic->ic_bss) |
| 1854 | return; |
| 1855 | else if (ic->ic_flags & IEEE80211_F_DESBSSID) { |
| 1856 | /* |
| 1857 | * Now, ni does not represent a network we |
| 1858 | * want to belong to, so start a scan. |
| 1859 | */ |
| 1860 | ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); |
| 1861 | return; |
| 1862 | } else { |
| 1863 | /* |
| 1864 | * A RUN->RUN transition lets the driver |
| 1865 | * reprogram its BSSID filter. |
| 1866 | * |
| 1867 | * No need to SCAN, we already belong to |
| 1868 | * an IBSS that meets our criteria: channel, |
| 1869 | * SSID, etc. It could be harmful to scan, |
| 1870 | * too: if a scan does not detect nodes |
| 1871 | * belonging to my current IBSS, then we |
| 1872 | * will create a new IBSS at the end of |
| 1873 | * the scan, needlessly splitting the |
| 1874 | * network. |
| 1875 | */ |
| 1876 | ieee80211_new_state(ic, IEEE80211_S_RUN, 0); |
| 1877 | } |
| 1878 | } |
| 1879 | |
| 1880 | void |
| 1881 | ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, |
| 1882 | struct ieee80211_node *ni, |
| 1883 | int subtype, int , u_int32_t rstamp) |
| 1884 | { |
| 1885 | #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) |
| 1886 | #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) |
| 1887 | struct ieee80211_frame *wh; |
| 1888 | u_int8_t *frm, *efrm; |
| 1889 | u_int8_t *ssid, *rates, *xrates, *wpa, *wme; |
| 1890 | int reassoc, resp, allocbs; |
| 1891 | u_int8_t rate; |
| 1892 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 1893 | |
| 1894 | wh = mtod(m0, struct ieee80211_frame *); |
| 1895 | frm = (u_int8_t *)&wh[1]; |
| 1896 | efrm = mtod(m0, u_int8_t *) + m0->m_len; |
| 1897 | switch (subtype) { |
| 1898 | case IEEE80211_FC0_SUBTYPE_PROBE_RESP: |
| 1899 | case IEEE80211_FC0_SUBTYPE_BEACON: { |
| 1900 | struct ieee80211_scanparams scan; |
| 1901 | |
| 1902 | /* |
| 1903 | * We process beacon/probe response frames: |
| 1904 | * o when scanning, or |
| 1905 | * o station mode when associated (to collect state |
| 1906 | * updates such as 802.11g slot time), or |
| 1907 | * o adhoc mode (to discover neighbors) |
| 1908 | * Frames otherwise received are discarded. |
| 1909 | */ |
| 1910 | if (!((ic->ic_flags & IEEE80211_F_SCAN) || |
| 1911 | (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || |
| 1912 | ic->ic_opmode == IEEE80211_M_IBSS)) { |
| 1913 | ic->ic_stats.is_rx_mgtdiscard++; |
| 1914 | return; |
| 1915 | } |
| 1916 | /* |
| 1917 | * beacon/probe response frame format |
| 1918 | * [8] time stamp |
| 1919 | * [2] beacon interval |
| 1920 | * [2] capability information |
| 1921 | * [tlv] ssid |
| 1922 | * [tlv] supported rates |
| 1923 | * [tlv] country information |
| 1924 | * [tlv] parameter set (FH/DS) |
| 1925 | * [tlv] erp information |
| 1926 | * [tlv] extended supported rates |
| 1927 | * [tlv] WME |
| 1928 | * [tlv] WPA or RSN |
| 1929 | */ |
| 1930 | IEEE80211_VERIFY_LENGTH(efrm - frm, 12); |
| 1931 | memset(&scan, 0, sizeof(scan)); |
| 1932 | scan.tstamp = frm; frm += 8; |
| 1933 | scan.bintval = le16toh(*(u_int16_t *)frm); frm += 2; |
| 1934 | scan.capinfo = le16toh(*(u_int16_t *)frm); frm += 2; |
| 1935 | scan.bchan = ieee80211_chan2ieee(ic, ic->ic_curchan); |
| 1936 | scan.chan = scan.bchan; |
| 1937 | |
| 1938 | while (frm < efrm) { |
| 1939 | switch (*frm) { |
| 1940 | case IEEE80211_ELEMID_SSID: |
| 1941 | scan.ssid = frm; |
| 1942 | break; |
| 1943 | case IEEE80211_ELEMID_RATES: |
| 1944 | scan.rates = frm; |
| 1945 | break; |
| 1946 | case IEEE80211_ELEMID_COUNTRY: |
| 1947 | scan.country = frm; |
| 1948 | break; |
| 1949 | case IEEE80211_ELEMID_FHPARMS: |
| 1950 | if (ic->ic_phytype == IEEE80211_T_FH) { |
| 1951 | scan.fhdwell = LE_READ_2(&frm[2]); |
| 1952 | scan.chan = IEEE80211_FH_CHAN(frm[4], frm[5]); |
| 1953 | scan.fhindex = frm[6]; |
| 1954 | } |
| 1955 | break; |
| 1956 | case IEEE80211_ELEMID_DSPARMS: |
| 1957 | /* |
| 1958 | * XXX hack this since depending on phytype |
| 1959 | * is problematic for multi-mode devices. |
| 1960 | */ |
| 1961 | if (ic->ic_phytype != IEEE80211_T_FH) |
| 1962 | scan.chan = frm[2]; |
| 1963 | break; |
| 1964 | case IEEE80211_ELEMID_TIM: |
| 1965 | /* XXX ATIM? */ |
| 1966 | scan.tim = frm; |
| 1967 | scan.timoff = frm - mtod(m0, u_int8_t *); |
| 1968 | break; |
| 1969 | case IEEE80211_ELEMID_IBSSPARMS: |
| 1970 | break; |
| 1971 | case IEEE80211_ELEMID_XRATES: |
| 1972 | scan.xrates = frm; |
| 1973 | break; |
| 1974 | case IEEE80211_ELEMID_ERP: |
| 1975 | if (frm[1] != 1) { |
| 1976 | IEEE80211_DISCARD_IE(ic, |
| 1977 | IEEE80211_MSG_ELEMID, wh, "ERP" , |
| 1978 | "bad len %u" , frm[1]); |
| 1979 | ic->ic_stats.is_rx_elem_toobig++; |
| 1980 | break; |
| 1981 | } |
| 1982 | scan.erp = frm[2]; |
| 1983 | break; |
| 1984 | case IEEE80211_ELEMID_RSN: |
| 1985 | scan.wpa = frm; |
| 1986 | break; |
| 1987 | case IEEE80211_ELEMID_VENDOR: |
| 1988 | if (iswpaoui(frm)) |
| 1989 | scan.wpa = frm; |
| 1990 | else if (iswmeparam(frm) || iswmeinfo(frm)) |
| 1991 | scan.wme = frm; |
| 1992 | /* XXX Atheros OUI support */ |
| 1993 | break; |
| 1994 | default: |
| 1995 | IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, |
| 1996 | wh, "unhandled" , |
| 1997 | "id %u, len %u" , *frm, frm[1]); |
| 1998 | ic->ic_stats.is_rx_elem_unknown++; |
| 1999 | break; |
| 2000 | } |
| 2001 | frm += frm[1] + 2; |
| 2002 | } |
| 2003 | IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); |
| 2004 | IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); |
| 2005 | if ( |
| 2006 | #if IEEE80211_CHAN_MAX < 255 |
| 2007 | scan.chan > IEEE80211_CHAN_MAX || |
| 2008 | #endif |
| 2009 | isclr(ic->ic_chan_active, scan.chan)) { |
| 2010 | IEEE80211_DISCARD(ic, |
| 2011 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, |
| 2012 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2013 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2014 | "invalid channel %u" , scan.chan); |
| 2015 | ic->ic_stats.is_rx_badchan++; |
| 2016 | return; |
| 2017 | } |
| 2018 | if (scan.chan != scan.bchan && |
| 2019 | ic->ic_phytype != IEEE80211_T_FH) { |
| 2020 | /* |
| 2021 | * Frame was received on a channel different from the |
| 2022 | * one indicated in the DS params element id; |
| 2023 | * silently discard it. |
| 2024 | * |
| 2025 | * NB: this can happen due to signal leakage. |
| 2026 | * But we should take it for FH phy because |
| 2027 | * the rssi value should be correct even for |
| 2028 | * different hop pattern in FH. |
| 2029 | */ |
| 2030 | IEEE80211_DISCARD(ic, |
| 2031 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, |
| 2032 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2033 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2034 | "for off-channel %u" , scan.chan); |
| 2035 | ic->ic_stats.is_rx_chanmismatch++; |
| 2036 | return; |
| 2037 | } |
| 2038 | if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && |
| 2039 | scan.bintval <= IEEE80211_BINTVAL_MAX)) { |
| 2040 | IEEE80211_DISCARD(ic, |
| 2041 | IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, |
| 2042 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2043 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2044 | "bogus beacon interval" , scan.bintval); |
| 2045 | ic->ic_stats.is_rx_badbintval++; |
| 2046 | return; |
| 2047 | } |
| 2048 | |
| 2049 | if (ni != ic->ic_bss) { |
| 2050 | ni = ieee80211_refine_node_for_beacon(ic, ni, |
| 2051 | &ic->ic_channels[scan.chan], scan.ssid); |
| 2052 | } |
| 2053 | /* |
| 2054 | * Count frame now that we know it's to be processed. |
| 2055 | */ |
| 2056 | if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { |
| 2057 | ic->ic_stats.is_rx_beacon++; /* XXX remove */ |
| 2058 | IEEE80211_NODE_STAT(ni, rx_beacons); |
| 2059 | } else |
| 2060 | IEEE80211_NODE_STAT(ni, rx_proberesp); |
| 2061 | |
| 2062 | /* |
| 2063 | * When operating in station mode, check for state updates. |
| 2064 | * Be careful to ignore beacons received while doing a |
| 2065 | * background scan. We consider only 11g/WMM stuff right now. |
| 2066 | */ |
| 2067 | if (ic->ic_opmode == IEEE80211_M_STA && |
| 2068 | ni->ni_associd != 0 && |
| 2069 | ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || |
| 2070 | IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { |
| 2071 | /* record tsf of last beacon */ |
| 2072 | memcpy(ni->ni_tstamp.data, scan.tstamp, |
| 2073 | sizeof(ni->ni_tstamp)); |
| 2074 | if (ni->ni_erp != scan.erp) { |
| 2075 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2076 | "[%s] erp change: was 0x%x, now 0x%x\n" , |
| 2077 | ether_snprintf(ebuf, sizeof(ebuf), |
| 2078 | wh->i_addr2), ni->ni_erp, scan.erp); |
| 2079 | if (ic->ic_curmode == IEEE80211_MODE_11G && |
| 2080 | (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) |
| 2081 | ic->ic_flags |= IEEE80211_F_USEPROT; |
| 2082 | else |
| 2083 | ic->ic_flags &= ~IEEE80211_F_USEPROT; |
| 2084 | ni->ni_erp = scan.erp; |
| 2085 | /* XXX statistic */ |
| 2086 | } |
| 2087 | if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { |
| 2088 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2089 | "[%s] capabilities change: before 0x%x," |
| 2090 | " now 0x%x\n" , |
| 2091 | ether_snprintf(ebuf, sizeof(ebuf), |
| 2092 | wh->i_addr2), |
| 2093 | ni->ni_capinfo, scan.capinfo); |
| 2094 | /* |
| 2095 | * NB: we assume short preamble doesn't |
| 2096 | * change dynamically |
| 2097 | */ |
| 2098 | ieee80211_set_shortslottime(ic, |
| 2099 | ic->ic_curmode == IEEE80211_MODE_11A || |
| 2100 | (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); |
| 2101 | ni->ni_capinfo = scan.capinfo; |
| 2102 | /* XXX statistic */ |
| 2103 | } |
| 2104 | if (scan.wme != NULL && |
| 2105 | (ni->ni_flags & IEEE80211_NODE_QOS) && |
| 2106 | ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) |
| 2107 | ieee80211_wme_updateparams(ic); |
| 2108 | if (scan.tim != NULL) { |
| 2109 | struct ieee80211_tim_ie *ie = |
| 2110 | (struct ieee80211_tim_ie *) scan.tim; |
| 2111 | |
| 2112 | ni->ni_dtim_count = ie->tim_count; |
| 2113 | ni->ni_dtim_period = ie->tim_period; |
| 2114 | } |
| 2115 | if (ic->ic_flags & IEEE80211_F_SCAN) |
| 2116 | ieee80211_add_scan(ic, &scan, wh, |
| 2117 | subtype, rssi, rstamp); |
| 2118 | ic->ic_bmiss_count = 0; |
| 2119 | return; |
| 2120 | } |
| 2121 | /* |
| 2122 | * If scanning, just pass information to the scan module. |
| 2123 | */ |
| 2124 | if (ic->ic_flags & IEEE80211_F_SCAN) { |
| 2125 | if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { |
| 2126 | /* |
| 2127 | * Actively scanning a channel marked passive; |
| 2128 | * send a probe request now that we know there |
| 2129 | * is 802.11 traffic present. |
| 2130 | * |
| 2131 | * XXX check if the beacon we recv'd gives |
| 2132 | * us what we need and suppress the probe req |
| 2133 | */ |
| 2134 | ieee80211_probe_curchan(ic, 1); |
| 2135 | ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; |
| 2136 | } |
| 2137 | ieee80211_add_scan(ic, &scan, wh, |
| 2138 | subtype, rssi, rstamp); |
| 2139 | return; |
| 2140 | } |
| 2141 | if (scan.capinfo & IEEE80211_CAPINFO_IBSS) |
| 2142 | ieee80211_update_adhoc_node(ic, ni, wh, &scan, rssi, |
| 2143 | rstamp); |
| 2144 | break; |
| 2145 | } |
| 2146 | |
| 2147 | case IEEE80211_FC0_SUBTYPE_PROBE_REQ: |
| 2148 | if (ic->ic_opmode == IEEE80211_M_STA || |
| 2149 | ic->ic_state != IEEE80211_S_RUN) { |
| 2150 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2151 | return; |
| 2152 | } |
| 2153 | if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { |
| 2154 | /* frame must be directed */ |
| 2155 | ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ |
| 2156 | return; |
| 2157 | } |
| 2158 | |
| 2159 | /* |
| 2160 | * prreq frame format |
| 2161 | * [tlv] ssid |
| 2162 | * [tlv] supported rates |
| 2163 | * [tlv] extended supported rates |
| 2164 | */ |
| 2165 | ssid = rates = xrates = NULL; |
| 2166 | while (frm < efrm) { |
| 2167 | switch (*frm) { |
| 2168 | case IEEE80211_ELEMID_SSID: |
| 2169 | ssid = frm; |
| 2170 | break; |
| 2171 | case IEEE80211_ELEMID_RATES: |
| 2172 | rates = frm; |
| 2173 | break; |
| 2174 | case IEEE80211_ELEMID_XRATES: |
| 2175 | xrates = frm; |
| 2176 | break; |
| 2177 | } |
| 2178 | frm += frm[1] + 2; |
| 2179 | } |
| 2180 | IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); |
| 2181 | IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); |
| 2182 | IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); |
| 2183 | if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { |
| 2184 | IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, |
| 2185 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2186 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2187 | "%s" , "no ssid with ssid suppression enabled" ); |
| 2188 | ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ |
| 2189 | return; |
| 2190 | } |
| 2191 | |
| 2192 | if (ni == ic->ic_bss) { |
| 2193 | if (ic->ic_opmode != IEEE80211_M_IBSS) |
| 2194 | ni = ieee80211_tmp_node(ic, wh->i_addr2); |
| 2195 | else if (IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) |
| 2196 | ; |
| 2197 | else { |
| 2198 | /* |
| 2199 | * XXX Cannot tell if the sender is operating |
| 2200 | * in ibss mode. But we need a new node to |
| 2201 | * send the response so blindly add them to the |
| 2202 | * neighbor table. |
| 2203 | */ |
| 2204 | ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, |
| 2205 | wh->i_addr2); |
| 2206 | } |
| 2207 | if (ni == NULL) |
| 2208 | return; |
| 2209 | allocbs = 1; |
| 2210 | } else |
| 2211 | allocbs = 0; |
| 2212 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2213 | "[%s] recv probe req\n" , ether_snprintf( |
| 2214 | ebuf, sizeof(ebuf), wh->i_addr2)); |
| 2215 | ni->ni_rssi = rssi; |
| 2216 | ni->ni_rstamp = rstamp; |
| 2217 | rate = ieee80211_setup_rates(ni, rates, xrates, |
| 2218 | IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE |
| 2219 | | IEEE80211_R_DONEGO | IEEE80211_R_DODEL); |
| 2220 | if (rate & IEEE80211_RATE_BASIC) { |
| 2221 | IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, |
| 2222 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2223 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2224 | "%s" , "recv'd rate set invalid" ); |
| 2225 | } else { |
| 2226 | IEEE80211_SEND_MGMT(ic, ni, |
| 2227 | IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); |
| 2228 | } |
| 2229 | if (allocbs && ic->ic_opmode != IEEE80211_M_IBSS) { |
| 2230 | /* reclaim immediately */ |
| 2231 | ieee80211_free_node(ni); |
| 2232 | } |
| 2233 | break; |
| 2234 | |
| 2235 | case IEEE80211_FC0_SUBTYPE_AUTH: { |
| 2236 | u_int16_t algo, seq, status; |
| 2237 | /* |
| 2238 | * auth frame format |
| 2239 | * [2] algorithm |
| 2240 | * [2] sequence |
| 2241 | * [2] status |
| 2242 | * [tlv*] challenge |
| 2243 | */ |
| 2244 | IEEE80211_VERIFY_LENGTH(efrm - frm, 6); |
| 2245 | algo = le16toh(*(u_int16_t *)frm); |
| 2246 | seq = le16toh(*(u_int16_t *)(frm + 2)); |
| 2247 | status = le16toh(*(u_int16_t *)(frm + 4)); |
| 2248 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, |
| 2249 | "[%s] recv auth frame with algorithm %d seq %d\n" , |
| 2250 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), algo, seq); |
| 2251 | /* |
| 2252 | * Consult the ACL policy module if setup. |
| 2253 | */ |
| 2254 | if (ic->ic_acl != NULL && |
| 2255 | !ic->ic_acl->iac_check(ic, wh->i_addr2)) { |
| 2256 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, |
| 2257 | wh, "auth" , "%s" , "disallowed by ACL" ); |
| 2258 | ic->ic_stats.is_rx_acl++; |
| 2259 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 2260 | IEEE80211_SEND_MGMT(ic, ni, |
| 2261 | IEEE80211_FC0_SUBTYPE_AUTH, |
| 2262 | (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); |
| 2263 | } |
| 2264 | return; |
| 2265 | } |
| 2266 | if (ic->ic_flags & IEEE80211_F_COUNTERM) { |
| 2267 | IEEE80211_DISCARD(ic, |
| 2268 | IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, |
| 2269 | wh, "auth" , "%s" , "TKIP countermeasures enabled" ); |
| 2270 | ic->ic_stats.is_rx_auth_countermeasures++; |
| 2271 | #ifndef IEEE80211_NO_HOSTAP |
| 2272 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 2273 | IEEE80211_SEND_MGMT(ic, ni, |
| 2274 | IEEE80211_FC0_SUBTYPE_AUTH, |
| 2275 | IEEE80211_REASON_MIC_FAILURE); |
| 2276 | } |
| 2277 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 2278 | return; |
| 2279 | } |
| 2280 | if (algo == IEEE80211_AUTH_ALG_SHARED) |
| 2281 | ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, |
| 2282 | rstamp, seq, status); |
| 2283 | else if (algo == IEEE80211_AUTH_ALG_OPEN) |
| 2284 | ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq, |
| 2285 | status); |
| 2286 | else { |
| 2287 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, |
| 2288 | wh, "auth" , "unsupported alg %d" , algo); |
| 2289 | ic->ic_stats.is_rx_auth_unsupported++; |
| 2290 | #ifndef IEEE80211_NO_HOSTAP |
| 2291 | if (ic->ic_opmode == IEEE80211_M_HOSTAP) { |
| 2292 | /* XXX not right */ |
| 2293 | IEEE80211_SEND_MGMT(ic, ni, |
| 2294 | IEEE80211_FC0_SUBTYPE_AUTH, |
| 2295 | (seq+1) | (IEEE80211_STATUS_ALG<<16)); |
| 2296 | } |
| 2297 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 2298 | return; |
| 2299 | } |
| 2300 | break; |
| 2301 | } |
| 2302 | |
| 2303 | case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: |
| 2304 | case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { |
| 2305 | u_int16_t capinfo, lintval; |
| 2306 | struct ieee80211_rsnparms rsn; |
| 2307 | u_int8_t reason; |
| 2308 | |
| 2309 | if (ic->ic_opmode != IEEE80211_M_HOSTAP || |
| 2310 | ic->ic_state != IEEE80211_S_RUN) { |
| 2311 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2312 | return; |
| 2313 | } |
| 2314 | |
| 2315 | if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { |
| 2316 | reassoc = 1; |
| 2317 | resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; |
| 2318 | } else { |
| 2319 | reassoc = 0; |
| 2320 | resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; |
| 2321 | } |
| 2322 | /* |
| 2323 | * asreq frame format |
| 2324 | * [2] capability information |
| 2325 | * [2] listen interval |
| 2326 | * [6*] current AP address (reassoc only) |
| 2327 | * [tlv] ssid |
| 2328 | * [tlv] supported rates |
| 2329 | * [tlv] extended supported rates |
| 2330 | * [tlv] WPA or RSN |
| 2331 | */ |
| 2332 | IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4)); |
| 2333 | if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { |
| 2334 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, |
| 2335 | wh, ieee80211_mgt_subtype_name[subtype >> |
| 2336 | IEEE80211_FC0_SUBTYPE_SHIFT], |
| 2337 | "%s" , "wrong bssid" ); |
| 2338 | ic->ic_stats.is_rx_assoc_bss++; |
| 2339 | return; |
| 2340 | } |
| 2341 | capinfo = le16toh(*(u_int16_t *)frm); frm += 2; |
| 2342 | lintval = le16toh(*(u_int16_t *)frm); frm += 2; |
| 2343 | if (reassoc) |
| 2344 | frm += 6; /* ignore current AP info */ |
| 2345 | ssid = rates = xrates = wpa = wme = NULL; |
| 2346 | while (frm < efrm) { |
| 2347 | switch (*frm) { |
| 2348 | case IEEE80211_ELEMID_SSID: |
| 2349 | ssid = frm; |
| 2350 | break; |
| 2351 | case IEEE80211_ELEMID_RATES: |
| 2352 | rates = frm; |
| 2353 | break; |
| 2354 | case IEEE80211_ELEMID_XRATES: |
| 2355 | xrates = frm; |
| 2356 | break; |
| 2357 | /* XXX verify only one of RSN and WPA ie's? */ |
| 2358 | case IEEE80211_ELEMID_RSN: |
| 2359 | wpa = frm; |
| 2360 | break; |
| 2361 | case IEEE80211_ELEMID_VENDOR: |
| 2362 | if (iswpaoui(frm)) |
| 2363 | wpa = frm; |
| 2364 | else if (iswmeinfo(frm)) |
| 2365 | wme = frm; |
| 2366 | /* XXX Atheros OUI support */ |
| 2367 | break; |
| 2368 | } |
| 2369 | frm += frm[1] + 2; |
| 2370 | } |
| 2371 | IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); |
| 2372 | IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); |
| 2373 | IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); |
| 2374 | |
| 2375 | if (ni == ic->ic_bss) { |
| 2376 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, |
| 2377 | "[%s] deny %s request, sta not authenticated\n" , |
| 2378 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2379 | reassoc ? "reassoc" : "assoc" ); |
| 2380 | ieee80211_send_error(ic, ni, wh->i_addr2, |
| 2381 | IEEE80211_FC0_SUBTYPE_DEAUTH, |
| 2382 | IEEE80211_REASON_ASSOC_NOT_AUTHED); |
| 2383 | ic->ic_stats.is_rx_assoc_notauth++; |
| 2384 | return; |
| 2385 | } |
| 2386 | /* assert right associstion security credentials */ |
| 2387 | if (wpa == NULL && (ic->ic_flags & IEEE80211_F_WPA)) { |
| 2388 | IEEE80211_DPRINTF(ic, |
| 2389 | IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, |
| 2390 | "[%s] no WPA/RSN IE in association request\n" , |
| 2391 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2)); |
| 2392 | IEEE80211_SEND_MGMT(ic, ni, |
| 2393 | IEEE80211_FC0_SUBTYPE_DEAUTH, |
| 2394 | IEEE80211_REASON_RSN_REQUIRED); |
| 2395 | ieee80211_node_leave(ic, ni); |
| 2396 | /* XXX distinguish WPA/RSN? */ |
| 2397 | ic->ic_stats.is_rx_assoc_badwpaie++; |
| 2398 | return; |
| 2399 | } |
| 2400 | if (wpa != NULL) { |
| 2401 | /* |
| 2402 | * Parse WPA information element. Note that |
| 2403 | * we initialize the param block from the node |
| 2404 | * state so that information in the IE overrides |
| 2405 | * our defaults. The resulting parameters are |
| 2406 | * installed below after the association is assured. |
| 2407 | */ |
| 2408 | rsn = ni->ni_rsn; |
| 2409 | if (wpa[0] != IEEE80211_ELEMID_RSN) |
| 2410 | reason = ieee80211_parse_wpa(ic, wpa, &rsn, wh); |
| 2411 | else |
| 2412 | reason = ieee80211_parse_rsn(ic, wpa, &rsn, wh); |
| 2413 | if (reason != 0) { |
| 2414 | IEEE80211_SEND_MGMT(ic, ni, |
| 2415 | IEEE80211_FC0_SUBTYPE_DEAUTH, reason); |
| 2416 | ieee80211_node_leave(ic, ni); |
| 2417 | /* XXX distinguish WPA/RSN? */ |
| 2418 | ic->ic_stats.is_rx_assoc_badwpaie++; |
| 2419 | return; |
| 2420 | } |
| 2421 | IEEE80211_DPRINTF(ic, |
| 2422 | IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, |
| 2423 | "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n" , |
| 2424 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2425 | wpa[0] != IEEE80211_ELEMID_RSN ? "WPA" : "RSN" , |
| 2426 | rsn.rsn_mcastcipher, rsn.rsn_mcastkeylen, |
| 2427 | rsn.rsn_ucastcipher, rsn.rsn_ucastkeylen, |
| 2428 | rsn.rsn_keymgmt, rsn.rsn_caps); |
| 2429 | } |
| 2430 | /* discard challenge after association */ |
| 2431 | if (ni->ni_challenge != NULL) { |
| 2432 | free(ni->ni_challenge, M_DEVBUF); |
| 2433 | ni->ni_challenge = NULL; |
| 2434 | } |
| 2435 | /* NB: 802.11 spec says to ignore station's privacy bit */ |
| 2436 | if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { |
| 2437 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, |
| 2438 | "[%s] deny %s request, capability mismatch 0x%x\n" , |
| 2439 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2440 | reassoc ? "reassoc" : "assoc" , capinfo); |
| 2441 | IEEE80211_SEND_MGMT(ic, ni, resp, |
| 2442 | IEEE80211_STATUS_CAPINFO); |
| 2443 | ieee80211_node_leave(ic, ni); |
| 2444 | ic->ic_stats.is_rx_assoc_capmismatch++; |
| 2445 | return; |
| 2446 | } |
| 2447 | rate = ieee80211_setup_rates(ni, rates, xrates, |
| 2448 | IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE | |
| 2449 | IEEE80211_R_DONEGO | IEEE80211_R_DODEL); |
| 2450 | /* |
| 2451 | * If constrained to 11g-only stations reject an |
| 2452 | * 11b-only station. We cheat a bit here by looking |
| 2453 | * at the max negotiated xmit rate and assuming anyone |
| 2454 | * with a best rate <24Mb/s is an 11b station. |
| 2455 | */ |
| 2456 | if ((rate & IEEE80211_RATE_BASIC) || |
| 2457 | ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48)) { |
| 2458 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, |
| 2459 | "[%s] deny %s request, rate set mismatch\n" , |
| 2460 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2461 | reassoc ? "reassoc" : "assoc" ); |
| 2462 | IEEE80211_SEND_MGMT(ic, ni, resp, |
| 2463 | IEEE80211_STATUS_BASIC_RATE); |
| 2464 | ieee80211_node_leave(ic, ni); |
| 2465 | ic->ic_stats.is_rx_assoc_norate++; |
| 2466 | return; |
| 2467 | } |
| 2468 | ni->ni_rssi = rssi; |
| 2469 | ni->ni_rstamp = rstamp; |
| 2470 | ni->ni_intval = lintval; |
| 2471 | ni->ni_capinfo = capinfo; |
| 2472 | ni->ni_chan = ic->ic_bss->ni_chan; |
| 2473 | ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; |
| 2474 | ni->ni_fhindex = ic->ic_bss->ni_fhindex; |
| 2475 | if (wpa != NULL) { |
| 2476 | /* |
| 2477 | * Record WPA/RSN parameters for station, mark |
| 2478 | * node as using WPA and record information element |
| 2479 | * for applications that require it. |
| 2480 | */ |
| 2481 | ni->ni_rsn = rsn; |
| 2482 | ieee80211_saveie(&ni->ni_wpa_ie, wpa); |
| 2483 | } else if (ni->ni_wpa_ie != NULL) { |
| 2484 | /* |
| 2485 | * Flush any state from a previous association. |
| 2486 | */ |
| 2487 | free(ni->ni_wpa_ie, M_DEVBUF); |
| 2488 | ni->ni_wpa_ie = NULL; |
| 2489 | } |
| 2490 | if (wme != NULL) { |
| 2491 | /* |
| 2492 | * Record WME parameters for station, mark node |
| 2493 | * as capable of QoS and record information |
| 2494 | * element for applications that require it. |
| 2495 | */ |
| 2496 | ieee80211_saveie(&ni->ni_wme_ie, wme); |
| 2497 | ni->ni_flags |= IEEE80211_NODE_QOS; |
| 2498 | } else if (ni->ni_wme_ie != NULL) { |
| 2499 | /* |
| 2500 | * Flush any state from a previous association. |
| 2501 | */ |
| 2502 | free(ni->ni_wme_ie, M_DEVBUF); |
| 2503 | ni->ni_wme_ie = NULL; |
| 2504 | ni->ni_flags &= ~IEEE80211_NODE_QOS; |
| 2505 | } |
| 2506 | ieee80211_node_join(ic, ni, resp); |
| 2507 | break; |
| 2508 | } |
| 2509 | |
| 2510 | case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: |
| 2511 | case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { |
| 2512 | u_int16_t capinfo, associd; |
| 2513 | u_int16_t status; |
| 2514 | |
| 2515 | if (ic->ic_opmode != IEEE80211_M_STA || |
| 2516 | ic->ic_state != IEEE80211_S_ASSOC) { |
| 2517 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2518 | return; |
| 2519 | } |
| 2520 | |
| 2521 | /* |
| 2522 | * asresp frame format |
| 2523 | * [2] capability information |
| 2524 | * [2] status |
| 2525 | * [2] association ID |
| 2526 | * [tlv] supported rates |
| 2527 | * [tlv] extended supported rates |
| 2528 | * [tlv] WME |
| 2529 | */ |
| 2530 | IEEE80211_VERIFY_LENGTH(efrm - frm, 6); |
| 2531 | ni = ic->ic_bss; |
| 2532 | capinfo = le16toh(*(u_int16_t *)frm); |
| 2533 | frm += 2; |
| 2534 | status = le16toh(*(u_int16_t *)frm); |
| 2535 | frm += 2; |
| 2536 | if (status != 0) { |
| 2537 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2538 | "[%s] %sassoc failed (reason %d)\n" , |
| 2539 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2540 | ISREASSOC(subtype) ? "re" : "" , status); |
| 2541 | if (ni != ic->ic_bss) /* XXX never true? */ |
| 2542 | ni->ni_fails++; |
| 2543 | ic->ic_stats.is_rx_auth_fail++; /* XXX */ |
| 2544 | return; |
| 2545 | } |
| 2546 | associd = le16toh(*(u_int16_t *)frm); |
| 2547 | frm += 2; |
| 2548 | |
| 2549 | rates = xrates = wpa = wme = NULL; |
| 2550 | while (frm < efrm) { |
| 2551 | switch (*frm) { |
| 2552 | case IEEE80211_ELEMID_RATES: |
| 2553 | rates = frm; |
| 2554 | break; |
| 2555 | case IEEE80211_ELEMID_XRATES: |
| 2556 | xrates = frm; |
| 2557 | break; |
| 2558 | case IEEE80211_ELEMID_VENDOR: |
| 2559 | if (iswmeoui(frm)) |
| 2560 | wme = frm; |
| 2561 | /* XXX Atheros OUI support */ |
| 2562 | break; |
| 2563 | } |
| 2564 | frm += frm[1] + 2; |
| 2565 | } |
| 2566 | |
| 2567 | IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); |
| 2568 | rate = ieee80211_setup_rates(ni, rates, xrates, |
| 2569 | IEEE80211_R_DOSORT | IEEE80211_R_DOFRATE | |
| 2570 | IEEE80211_R_DONEGO | IEEE80211_R_DODEL); |
| 2571 | if (rate & IEEE80211_RATE_BASIC) { |
| 2572 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2573 | "[%s] %sassoc failed (rate set mismatch)\n" , |
| 2574 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2575 | ISREASSOC(subtype) ? "re" : "" ); |
| 2576 | if (ni != ic->ic_bss) /* XXX never true? */ |
| 2577 | ni->ni_fails++; |
| 2578 | ic->ic_stats.is_rx_assoc_norate++; |
| 2579 | ieee80211_new_state(ic, IEEE80211_S_SCAN, 0); |
| 2580 | return; |
| 2581 | } |
| 2582 | |
| 2583 | ni->ni_capinfo = capinfo; |
| 2584 | ni->ni_associd = associd; |
| 2585 | if (wme != NULL && |
| 2586 | ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { |
| 2587 | ni->ni_flags |= IEEE80211_NODE_QOS; |
| 2588 | ieee80211_wme_updateparams(ic); |
| 2589 | } else |
| 2590 | ni->ni_flags &= ~IEEE80211_NODE_QOS; |
| 2591 | /* |
| 2592 | * Configure state now that we are associated. |
| 2593 | * |
| 2594 | * XXX may need different/additional driver callbacks? |
| 2595 | */ |
| 2596 | if (ic->ic_curmode == IEEE80211_MODE_11A || |
| 2597 | (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { |
| 2598 | ic->ic_flags |= IEEE80211_F_SHPREAMBLE; |
| 2599 | ic->ic_flags &= ~IEEE80211_F_USEBARKER; |
| 2600 | } else { |
| 2601 | ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; |
| 2602 | ic->ic_flags |= IEEE80211_F_USEBARKER; |
| 2603 | } |
| 2604 | ieee80211_set_shortslottime(ic, |
| 2605 | ic->ic_curmode == IEEE80211_MODE_11A || |
| 2606 | (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); |
| 2607 | /* |
| 2608 | * Honor ERP protection. |
| 2609 | * |
| 2610 | * NB: ni_erp should zero for non-11g operation. |
| 2611 | * XXX check ic_curmode anyway? |
| 2612 | */ |
| 2613 | if (ic->ic_curmode == IEEE80211_MODE_11G && |
| 2614 | (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) |
| 2615 | ic->ic_flags |= IEEE80211_F_USEPROT; |
| 2616 | else |
| 2617 | ic->ic_flags &= ~IEEE80211_F_USEPROT; |
| 2618 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2619 | "[%s] %sassoc success: %s preamble, %s slot time%s%s\n" , |
| 2620 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2), |
| 2621 | ISREASSOC(subtype) ? "re" : "" , |
| 2622 | ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long" , |
| 2623 | ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long" , |
| 2624 | ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "" , |
| 2625 | ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "" |
| 2626 | ); |
| 2627 | ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); |
| 2628 | break; |
| 2629 | } |
| 2630 | |
| 2631 | case IEEE80211_FC0_SUBTYPE_DEAUTH: { |
| 2632 | u_int16_t reason; |
| 2633 | |
| 2634 | if (ic->ic_state == IEEE80211_S_SCAN) { |
| 2635 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2636 | return; |
| 2637 | } |
| 2638 | /* |
| 2639 | * deauth frame format |
| 2640 | * [2] reason |
| 2641 | */ |
| 2642 | IEEE80211_VERIFY_LENGTH(efrm - frm, 2); |
| 2643 | reason = le16toh(*(u_int16_t *)frm); |
| 2644 | __USE(reason); |
| 2645 | ic->ic_stats.is_rx_deauth++; |
| 2646 | IEEE80211_NODE_STAT(ni, rx_deauth); |
| 2647 | |
| 2648 | if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { |
| 2649 | /* Not intended for this station. */ |
| 2650 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2651 | break; |
| 2652 | } |
| 2653 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, |
| 2654 | "[%s] recv deauthenticate (reason %d)\n" , |
| 2655 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), reason); |
| 2656 | switch (ic->ic_opmode) { |
| 2657 | case IEEE80211_M_STA: |
| 2658 | ieee80211_new_state(ic, IEEE80211_S_AUTH, |
| 2659 | wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); |
| 2660 | break; |
| 2661 | case IEEE80211_M_HOSTAP: |
| 2662 | #ifndef IEEE80211_NO_HOSTAP |
| 2663 | if (ni != ic->ic_bss) |
| 2664 | ieee80211_node_leave(ic, ni); |
| 2665 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 2666 | break; |
| 2667 | default: |
| 2668 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2669 | break; |
| 2670 | } |
| 2671 | break; |
| 2672 | } |
| 2673 | |
| 2674 | case IEEE80211_FC0_SUBTYPE_DISASSOC: { |
| 2675 | u_int16_t reason; |
| 2676 | |
| 2677 | if (ic->ic_state != IEEE80211_S_RUN && |
| 2678 | ic->ic_state != IEEE80211_S_ASSOC && |
| 2679 | ic->ic_state != IEEE80211_S_AUTH) { |
| 2680 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2681 | return; |
| 2682 | } |
| 2683 | /* |
| 2684 | * disassoc frame format |
| 2685 | * [2] reason |
| 2686 | */ |
| 2687 | IEEE80211_VERIFY_LENGTH(efrm - frm, 2); |
| 2688 | reason = le16toh(*(u_int16_t *)frm); |
| 2689 | __USE(reason); |
| 2690 | ic->ic_stats.is_rx_disassoc++; |
| 2691 | IEEE80211_NODE_STAT(ni, rx_disassoc); |
| 2692 | |
| 2693 | if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { |
| 2694 | /* Not intended for this station. */ |
| 2695 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2696 | break; |
| 2697 | } |
| 2698 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, |
| 2699 | "[%s] recv disassociate (reason %d)\n" , |
| 2700 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), reason); |
| 2701 | switch (ic->ic_opmode) { |
| 2702 | case IEEE80211_M_STA: |
| 2703 | ieee80211_new_state(ic, IEEE80211_S_ASSOC, |
| 2704 | wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); |
| 2705 | break; |
| 2706 | case IEEE80211_M_HOSTAP: |
| 2707 | #ifndef IEEE80211_NO_HOSTAP |
| 2708 | if (ni != ic->ic_bss) |
| 2709 | ieee80211_node_leave(ic, ni); |
| 2710 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 2711 | break; |
| 2712 | default: |
| 2713 | ic->ic_stats.is_rx_mgtdiscard++; |
| 2714 | break; |
| 2715 | } |
| 2716 | break; |
| 2717 | } |
| 2718 | default: |
| 2719 | IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, |
| 2720 | wh, "mgt" , "subtype 0x%x not handled" , subtype); |
| 2721 | ic->ic_stats.is_rx_badsubtype++; |
| 2722 | break; |
| 2723 | } |
| 2724 | #undef ISREASSOC |
| 2725 | #undef ISPROBE |
| 2726 | } |
| 2727 | #undef IEEE80211_VERIFY_LENGTH |
| 2728 | #undef IEEE80211_VERIFY_ELEMENT |
| 2729 | |
| 2730 | #ifndef IEEE80211_NO_HOSTAP |
| 2731 | /* |
| 2732 | * Handle station power-save state change. |
| 2733 | */ |
| 2734 | static void |
| 2735 | ieee80211_node_pwrsave(struct ieee80211_node *ni, int enable) |
| 2736 | { |
| 2737 | struct ieee80211com *ic = ni->ni_ic; |
| 2738 | struct mbuf *m; |
| 2739 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 2740 | |
| 2741 | if (enable) { |
| 2742 | if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) == 0) |
| 2743 | ic->ic_ps_sta++; |
| 2744 | ni->ni_flags |= IEEE80211_NODE_PWR_MGT; |
| 2745 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2746 | "[%s] power save mode on, %u sta's in ps mode\n" , |
| 2747 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), |
| 2748 | ic->ic_ps_sta); |
| 2749 | return; |
| 2750 | } |
| 2751 | |
| 2752 | if (ni->ni_flags & IEEE80211_NODE_PWR_MGT) |
| 2753 | ic->ic_ps_sta--; |
| 2754 | ni->ni_flags &= ~IEEE80211_NODE_PWR_MGT; |
| 2755 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2756 | "[%s] power save mode off, %u sta's in ps mode\n" , |
| 2757 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), ic->ic_ps_sta); |
| 2758 | /* XXX if no stations in ps mode, flush mc frames */ |
| 2759 | |
| 2760 | /* |
| 2761 | * Flush queued unicast frames. |
| 2762 | */ |
| 2763 | if (IEEE80211_NODE_SAVEQ_QLEN(ni) == 0) { |
| 2764 | if (ic->ic_set_tim != NULL) |
| 2765 | ic->ic_set_tim(ni, 0); /* just in case */ |
| 2766 | return; |
| 2767 | } |
| 2768 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2769 | "[%s] flush ps queue, %u packets queued\n" , |
| 2770 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), |
| 2771 | IEEE80211_NODE_SAVEQ_QLEN(ni)); |
| 2772 | for (;;) { |
| 2773 | int qlen; |
| 2774 | |
| 2775 | IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); |
| 2776 | if (m == NULL) |
| 2777 | break; |
| 2778 | /* |
| 2779 | * If this is the last packet, turn off the TIM bit. |
| 2780 | * If there are more packets, set the more packets bit |
| 2781 | * in the mbuf so ieee80211_encap will mark the 802.11 |
| 2782 | * head to indicate more data frames will follow. |
| 2783 | */ |
| 2784 | if (qlen != 0) |
| 2785 | m->m_flags |= M_MORE_DATA; |
| 2786 | /* XXX need different driver interface */ |
| 2787 | /* XXX bypasses q max */ |
| 2788 | IF_ENQUEUE(&ic->ic_ifp->if_snd, m); |
| 2789 | } |
| 2790 | if (ic->ic_set_tim != NULL) |
| 2791 | ic->ic_set_tim(ni, 0); |
| 2792 | } |
| 2793 | |
| 2794 | /* |
| 2795 | * Process a received ps-poll frame. |
| 2796 | */ |
| 2797 | static void |
| 2798 | ieee80211_recv_pspoll(struct ieee80211com *ic, |
| 2799 | struct ieee80211_node *ni, struct mbuf *m0) |
| 2800 | { |
| 2801 | struct ieee80211_frame_min *wh; |
| 2802 | struct mbuf *m; |
| 2803 | u_int16_t aid; |
| 2804 | int qlen; |
| 2805 | IEEE80211_DEBUGVAR(char ebuf[3 * ETHER_ADDR_LEN]); |
| 2806 | |
| 2807 | wh = mtod(m0, struct ieee80211_frame_min *); |
| 2808 | if (ni->ni_associd == 0) { |
| 2809 | IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, |
| 2810 | (struct ieee80211_frame *) wh, "ps-poll" , |
| 2811 | "%s" , "unassociated station" ); |
| 2812 | ic->ic_stats.is_ps_unassoc++; |
| 2813 | IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, |
| 2814 | IEEE80211_REASON_NOT_ASSOCED); |
| 2815 | return; |
| 2816 | } |
| 2817 | |
| 2818 | aid = le16toh(*(u_int16_t *)wh->i_dur); |
| 2819 | if (aid != ni->ni_associd) { |
| 2820 | IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, |
| 2821 | (struct ieee80211_frame *) wh, "ps-poll" , |
| 2822 | "aid mismatch: sta aid 0x%x poll aid 0x%x" , |
| 2823 | ni->ni_associd, aid); |
| 2824 | ic->ic_stats.is_ps_badaid++; |
| 2825 | IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, |
| 2826 | IEEE80211_REASON_NOT_ASSOCED); |
| 2827 | return; |
| 2828 | } |
| 2829 | |
| 2830 | /* Okay, take the first queued packet and put it out... */ |
| 2831 | IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); |
| 2832 | if (m == NULL) { |
| 2833 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2834 | "[%s] recv ps-poll, but queue empty\n" , |
| 2835 | ether_snprintf(ebuf, sizeof(ebuf), wh->i_addr2)); |
| 2836 | ieee80211_send_nulldata(ieee80211_ref_node(ni)); |
| 2837 | ic->ic_stats.is_ps_qempty++; /* XXX node stat */ |
| 2838 | if (ic->ic_set_tim != NULL) |
| 2839 | ic->ic_set_tim(ni, 0); /* just in case */ |
| 2840 | return; |
| 2841 | } |
| 2842 | /* |
| 2843 | * If there are more packets, set the more packets bit |
| 2844 | * in the packet dispatched to the station; otherwise |
| 2845 | * turn off the TIM bit. |
| 2846 | */ |
| 2847 | if (qlen != 0) { |
| 2848 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2849 | "[%s] recv ps-poll, send packet, %u still queued\n" , |
| 2850 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr), qlen); |
| 2851 | m->m_flags |= M_MORE_DATA; |
| 2852 | } else { |
| 2853 | IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, |
| 2854 | "[%s] recv ps-poll, send packet, queue empty\n" , |
| 2855 | ether_snprintf(ebuf, sizeof(ebuf), ni->ni_macaddr)); |
| 2856 | if (ic->ic_set_tim != NULL) |
| 2857 | ic->ic_set_tim(ni, 0); |
| 2858 | } |
| 2859 | m->m_flags |= M_PWR_SAV; /* bypass PS handling */ |
| 2860 | IF_ENQUEUE(&ic->ic_ifp->if_snd, m); |
| 2861 | } |
| 2862 | #endif /* !IEEE80211_NO_HOSTAP */ |
| 2863 | |
| 2864 | #ifdef IEEE80211_DEBUG |
| 2865 | /* |
| 2866 | * Debugging support. |
| 2867 | */ |
| 2868 | |
| 2869 | /* |
| 2870 | * Return the bssid of a frame. |
| 2871 | */ |
| 2872 | static const u_int8_t * |
| 2873 | ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) |
| 2874 | { |
| 2875 | if (ic->ic_opmode == IEEE80211_M_STA) |
| 2876 | return wh->i_addr2; |
| 2877 | if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) |
| 2878 | return wh->i_addr1; |
| 2879 | if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) |
| 2880 | return wh->i_addr1; |
| 2881 | return wh->i_addr3; |
| 2882 | } |
| 2883 | |
| 2884 | void |
| 2885 | ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) |
| 2886 | { |
| 2887 | char buf[128]; /* XXX */ |
| 2888 | va_list ap; |
| 2889 | |
| 2890 | va_start(ap, fmt); |
| 2891 | vsnprintf(buf, sizeof(buf), fmt, ap); |
| 2892 | va_end(ap); |
| 2893 | |
| 2894 | if_printf(ic->ic_ifp, "%s" , buf); /* NB: no \n */ |
| 2895 | } |
| 2896 | |
| 2897 | void |
| 2898 | ieee80211_note_frame(struct ieee80211com *ic, |
| 2899 | const struct ieee80211_frame *wh, |
| 2900 | const char *fmt, ...) |
| 2901 | { |
| 2902 | char buf[128]; /* XXX */ |
| 2903 | va_list ap; |
| 2904 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 2905 | |
| 2906 | va_start(ap, fmt); |
| 2907 | vsnprintf(buf, sizeof(buf), fmt, ap); |
| 2908 | va_end(ap); |
| 2909 | if_printf(ic->ic_ifp, "[%s] %s\n" , |
| 2910 | ether_snprintf(ebuf, sizeof(ebuf), |
| 2911 | ieee80211_getbssid(ic, wh)), buf); |
| 2912 | } |
| 2913 | |
| 2914 | void |
| 2915 | ieee80211_note_mac(struct ieee80211com *ic, |
| 2916 | const u_int8_t mac[IEEE80211_ADDR_LEN], |
| 2917 | const char *fmt, ...) |
| 2918 | { |
| 2919 | char buf[128]; /* XXX */ |
| 2920 | va_list ap; |
| 2921 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 2922 | |
| 2923 | va_start(ap, fmt); |
| 2924 | vsnprintf(buf, sizeof(buf), fmt, ap); |
| 2925 | va_end(ap); |
| 2926 | if_printf(ic->ic_ifp, "[%s] %s\n" , ether_snprintf(ebuf, sizeof(ebuf), |
| 2927 | mac), buf); |
| 2928 | } |
| 2929 | |
| 2930 | static void |
| 2931 | ieee80211_discard_frame(struct ieee80211com *ic, |
| 2932 | const struct ieee80211_frame *wh, |
| 2933 | const char *type, const char *fmt, ...) |
| 2934 | { |
| 2935 | va_list ap; |
| 2936 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 2937 | |
| 2938 | printf("[%s:%s] discard " , ic->ic_ifp->if_xname, |
| 2939 | ether_snprintf(ebuf, sizeof(ebuf), ieee80211_getbssid(ic, wh))); |
| 2940 | if (type != NULL) |
| 2941 | printf("%s frame, " , type); |
| 2942 | else |
| 2943 | printf("frame, " ); |
| 2944 | va_start(ap, fmt); |
| 2945 | vprintf(fmt, ap); |
| 2946 | va_end(ap); |
| 2947 | printf("\n" ); |
| 2948 | } |
| 2949 | |
| 2950 | static void |
| 2951 | ieee80211_discard_ie(struct ieee80211com *ic, |
| 2952 | const struct ieee80211_frame *wh, |
| 2953 | const char *type, const char *fmt, ...) |
| 2954 | { |
| 2955 | va_list ap; |
| 2956 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 2957 | |
| 2958 | printf("[%s:%s] discard " , ic->ic_ifp->if_xname, |
| 2959 | ether_snprintf(ebuf, sizeof(ebuf), ieee80211_getbssid(ic, wh))); |
| 2960 | if (type != NULL) |
| 2961 | printf("%s information element, " , type); |
| 2962 | else |
| 2963 | printf("information element, " ); |
| 2964 | va_start(ap, fmt); |
| 2965 | vprintf(fmt, ap); |
| 2966 | va_end(ap); |
| 2967 | printf("\n" ); |
| 2968 | } |
| 2969 | |
| 2970 | static void |
| 2971 | ieee80211_discard_mac(struct ieee80211com *ic, |
| 2972 | const u_int8_t mac[IEEE80211_ADDR_LEN], |
| 2973 | const char *type, const char *fmt, ...) |
| 2974 | { |
| 2975 | va_list ap; |
| 2976 | char ebuf[3 * ETHER_ADDR_LEN]; |
| 2977 | |
| 2978 | printf("[%s:%s] discard " , ic->ic_ifp->if_xname, |
| 2979 | ether_snprintf(ebuf, sizeof(ebuf), mac)); |
| 2980 | if (type != NULL) |
| 2981 | printf("%s frame, " , type); |
| 2982 | else |
| 2983 | printf("frame, " ); |
| 2984 | va_start(ap, fmt); |
| 2985 | vprintf(fmt, ap); |
| 2986 | va_end(ap); |
| 2987 | printf("\n" ); |
| 2988 | } |
| 2989 | #endif /* IEEE80211_DEBUG */ |
| 2990 | |