ieee80211_output.c revision 1.47.34.1
1 /* $NetBSD: ieee80211_output.c,v 1.47.34.1 2008/02/22 16:50:25 skrll Exp $ */ 2 /*- 3 * Copyright (c) 2001 Atsushi Onoe 4 * Copyright (c) 2002-2007 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifdef __FreeBSD__ 30 __FBSDID("$FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.57 2007/12/07 01:46:12 kmacy Exp $"); 31 #endif 32 #ifdef __NetBSD__ 33 __KERNEL_RCSID(0, "$NetBSD: ieee80211_output.c,v 1.47.34.1 2008/02/22 16:50:25 skrll Exp $"); 34 #endif 35 36 #include "opt_inet.h" 37 38 #ifdef __NetBSD__ 39 #include "bpfilter.h" 40 #endif /* __NetBSD__ */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mbuf.h> 45 #include <sys/kernel.h> 46 #include <sys/endian.h> 47 #include <sys/errno.h> 48 #include <sys/proc.h> 49 #include <sys/sysctl.h> 50 51 #include <net/if.h> 52 #include <net/if_llc.h> 53 #include <net/if_media.h> 54 #include <net/if_arp.h> 55 #include <net/if_ether.h> 56 #include <net/if_llc.h> 57 #include <net/if_vlanvar.h> 58 59 #include <net80211/ieee80211_netbsd.h> 60 #include <net80211/ieee80211_var.h> 61 #include <net80211/ieee80211_regdomain.h> 62 63 #if NBPFILTER > 0 64 #include <net/bpf.h> 65 #endif 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #include <net/if_ether.h> 73 #endif 74 75 #define ETHER_HEADER_COPY(dst, src) \ 76 memcpy(dst, src, sizeof(struct ether_header)) 77 78 static struct mbuf *ieee80211_encap_fastframe(struct ieee80211com *ic, 79 struct mbuf *m1, const struct ether_header *eh1, 80 struct mbuf *m2, const struct ether_header *eh2); 81 static int ieee80211_fragment(struct ieee80211com *, struct mbuf *, 82 u_int hdrsize, u_int ciphdrsize, u_int mtu); 83 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int); 84 85 #ifdef IEEE80211_DEBUG 86 /* 87 * Decide if an outbound management frame should be 88 * printed when debugging is enabled. This filters some 89 * of the less interesting frames that come frequently 90 * (e.g. beacons). 91 */ 92 static __inline int 93 doprint(struct ieee80211com *ic, int subtype) 94 { 95 switch (subtype) { 96 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 97 return (ic->ic_opmode == IEEE80211_M_IBSS); 98 } 99 return 1; 100 } 101 #endif 102 103 /* 104 * Set the direction field and address fields of an outgoing 105 * non-QoS frame. Note this should be called early on in 106 * constructing a frame as it sets i_fc[1]; other bits can 107 * then be or'd in. 108 */ 109 static void 110 ieee80211_send_setup(struct ieee80211com *ic, 111 struct ieee80211_node *ni, 112 struct ieee80211_frame *wh, 113 int type, 114 const uint8_t sa[IEEE80211_ADDR_LEN], 115 const uint8_t da[IEEE80211_ADDR_LEN], 116 const uint8_t bssid[IEEE80211_ADDR_LEN]) 117 { 118 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh) 119 120 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type; 121 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) { 122 switch (ic->ic_opmode) { 123 case IEEE80211_M_STA: 124 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 125 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 126 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 127 IEEE80211_ADDR_COPY(wh->i_addr3, da); 128 break; 129 case IEEE80211_M_IBSS: 130 case IEEE80211_M_AHDEMO: 131 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 132 IEEE80211_ADDR_COPY(wh->i_addr1, da); 133 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 134 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 135 break; 136 case IEEE80211_M_HOSTAP: 137 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 138 IEEE80211_ADDR_COPY(wh->i_addr1, da); 139 IEEE80211_ADDR_COPY(wh->i_addr2, bssid); 140 IEEE80211_ADDR_COPY(wh->i_addr3, sa); 141 break; 142 case IEEE80211_M_WDS: 143 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS; 144 /* XXX cheat, bssid holds RA */ 145 IEEE80211_ADDR_COPY(wh->i_addr1, bssid); 146 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 147 IEEE80211_ADDR_COPY(wh->i_addr3, da); 148 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa); 149 break; 150 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */ 151 break; 152 } 153 } else { 154 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 155 IEEE80211_ADDR_COPY(wh->i_addr1, da); 156 IEEE80211_ADDR_COPY(wh->i_addr2, sa); 157 IEEE80211_ADDR_COPY(wh->i_addr3, bssid); 158 } 159 *(uint16_t *)&wh->i_dur[0] = 0; 160 /* NB: use non-QoS tid */ 161 *(uint16_t *)&wh->i_seq[0] = 162 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 163 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 164 #undef WH4 165 } 166 167 /* 168 * Send a management frame to the specified node. The node pointer 169 * must have a reference as the pointer will be passed to the driver 170 * and potentially held for a long time. If the frame is successfully 171 * dispatched to the driver, then it is responsible for freeing the 172 * reference (and potentially free'ing up any associated storage). 173 */ 174 int 175 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni, 176 struct mbuf *m, int type) 177 { 178 struct ifnet *ifp = ic->ic_ifp; 179 struct ieee80211_frame *wh; 180 181 IASSERT(ni != NULL, ("null node")); 182 183 /* 184 * Yech, hack alert! We want to pass the node down to the 185 * driver's start routine. If we don't do so then the start 186 * routine must immediately look it up again and that can 187 * cause a lock order reversal if, for example, this frame 188 * is being sent because the station is being timedout and 189 * the frame being sent is a DEAUTH message. We could stick 190 * this in an m_tag and tack that on to the mbuf. However 191 * that's rather expensive to do for every frame so instead 192 * we stuff it in the rcvif field since outbound frames do 193 * not (presently) use this. 194 */ 195 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 196 if (m == NULL) 197 return ENOMEM; 198 #ifdef __FreeBSD__ 199 IASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 200 #endif 201 m->m_pkthdr.rcvif = (void *)ni; 202 203 wh = mtod(m, struct ieee80211_frame *); 204 ieee80211_send_setup(ic, ni, wh, 205 IEEE80211_FC0_TYPE_MGT | type, 206 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 207 if ((m->m_flags & M_LINK0) != 0 && ni->ni_challenge != NULL) { 208 m->m_flags &= ~M_LINK0; 209 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 210 "[%s] encrypting frame (%s)\n", 211 ether_sprintf(wh->i_addr1), __func__); 212 wh->i_fc[1] |= IEEE80211_FC1_WEP; 213 } 214 if (ni->ni_flags & IEEE80211_NODE_QOS) { 215 /* NB: force all management frames to the highest queue */ 216 M_WME_SETAC(m, WME_AC_VO); 217 } else 218 M_WME_SETAC(m, WME_AC_BE); 219 #ifdef IEEE80211_DEBUG 220 /* avoid printing too many frames */ 221 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) || 222 ieee80211_msg_dumppkts(ic)) { 223 printf("[%s] send %s on channel %u\n", 224 ether_sprintf(wh->i_addr1), 225 ieee80211_mgt_subtype_name[ 226 (type & IEEE80211_FC0_SUBTYPE_MASK) >> 227 IEEE80211_FC0_SUBTYPE_SHIFT], 228 ieee80211_chan2ieee(ic, ic->ic_curchan)); 229 } 230 #endif 231 IEEE80211_NODE_STAT(ni, tx_mgmt); 232 IF_ENQUEUE(&ic->ic_mgtq, m); 233 ifp->if_timer = 1; 234 (*ifp->if_start)(ifp); 235 ifp->if_opackets++; 236 237 return 0; 238 } 239 240 /* 241 * Raw packet transmit stub for legacy drivers. 242 * Send the packet through the mgt q so we bypass 243 * the normal encapsulation work. 244 */ 245 int 246 ieee80211_raw_xmit(struct ieee80211_node *ni, struct mbuf *m, 247 const struct ieee80211_bpf_params *params) 248 { 249 struct ieee80211com *ic = ni->ni_ic; 250 struct ifnet *ifp = ic->ic_ifp; 251 252 m->m_pkthdr.rcvif = (void *) ni; 253 IF_ENQUEUE(&ic->ic_mgtq, m); 254 (*ifp->if_start)(ifp); 255 ifp->if_opackets++; 256 257 return 0; 258 } 259 260 /* XXXNH */ 261 #if 0 262 /* 263 * 802.11 output routine. This is (currently) used only to 264 * connect bpf write calls to the 802.11 layer for injecting 265 * raw 802.11 frames. Note we locate the ieee80211com from 266 * the ifnet using a spare field setup at attach time. This 267 * will go away when the virtual ap support comes in. 268 */ 269 int 270 ieee80211_output(struct ifnet *ifp, struct mbuf *m, 271 const struct sockaddr *dst, struct rtentry *rt0) 272 { 273 #define senderr(e) do { error = (e); goto bad;} while (0) 274 struct ieee80211com *ic = ifp->if_llsoftc; /* XXX */ 275 struct ieee80211_node *ni = NULL; 276 struct ieee80211_frame *wh; 277 int error; 278 279 /* 280 * Hand to the 802.3 code if not tagged as 281 * a raw 802.11 frame. 282 */ 283 if (dst->sa_family != AF_IEEE80211) 284 return ether_output(ifp, m, dst, rt0); 285 #ifdef MAC 286 error = mac_check_ifnet_transmit(ifp, m); 287 if (error) 288 senderr(error); 289 #endif 290 if (ifp->if_flags & IFF_MONITOR) 291 senderr(ENETDOWN); 292 if ((ifp->if_flags & IFF_UP) == 0) 293 senderr(ENETDOWN); 294 295 /* XXX bypass bridge, pfil, carp, etc. */ 296 297 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack)) 298 senderr(EIO); /* XXX */ 299 wh = mtod(m, struct ieee80211_frame *); 300 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != 301 IEEE80211_FC0_VERSION_0) 302 senderr(EIO); /* XXX */ 303 304 /* locate destination node */ 305 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { 306 case IEEE80211_FC1_DIR_NODS: 307 case IEEE80211_FC1_DIR_FROMDS: 308 ni = ieee80211_find_txnode(ic, wh->i_addr1); 309 break; 310 case IEEE80211_FC1_DIR_TODS: 311 case IEEE80211_FC1_DIR_DSTODS: 312 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) 313 senderr(EIO); /* XXX */ 314 ni = ieee80211_find_txnode(ic, wh->i_addr3); 315 break; 316 default: 317 senderr(EIO); /* XXX */ 318 } 319 if (ni == NULL) { 320 /* 321 * Permit packets w/ bpf params through regardless 322 * (see below about sa_len). 323 */ 324 if (dst->sa_len == 0) 325 senderr(EHOSTUNREACH); 326 ni = ieee80211_ref_node(ic->ic_bss); 327 } 328 329 /* XXX ctrl frames should go through */ 330 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 331 (m->m_flags & M_PWR_SAV) == 0) { 332 /* 333 * Station in power save mode; pass the frame 334 * to the 802.11 layer and continue. We'll get 335 * the frame back when the time is right. 336 */ 337 ieee80211_pwrsave(ni, m); 338 error = 0; 339 goto reclaim; 340 } 341 342 /* calculate priority so drivers can find the tx queue */ 343 /* XXX assumes an 802.3 frame */ 344 if (ieee80211_classify(ic, m, ni)) 345 senderr(EIO); /* XXX */ 346 347 BPF_MTAP(ifp, m); 348 /* 349 * NB: DLT_IEEE802_11_RADIO identifies the parameters are 350 * present by setting the sa_len field of the sockaddr (yes, 351 * this is a hack). 352 * NB: we assume sa_data is suitably aligned to cast. 353 */ 354 return ic->ic_raw_xmit(ni, m, (const struct ieee80211_bpf_params *) 355 (dst->sa_len ? dst->sa_data : NULL)); 356 bad: 357 if (m != NULL) 358 m_freem(m); 359 reclaim: 360 if (ni != NULL) 361 ieee80211_free_node(ni); 362 return error; 363 #undef senderr 364 } 365 #endif 366 367 /* 368 * Send a null data frame to the specified node. 369 * 370 * NB: the caller is assumed to have setup a node reference 371 * for use; this is necessary to deal with a race condition 372 * when probing for inactive stations. 373 */ 374 int 375 ieee80211_send_nulldata(struct ieee80211_node *ni) 376 { 377 struct ieee80211com *ic = ni->ni_ic; 378 struct ifnet *ifp = ic->ic_ifp; 379 struct mbuf *m; 380 struct ieee80211_frame *wh; 381 382 MGETHDR(m, M_NOWAIT, MT_DATA); 383 if (m == NULL) { 384 /* XXX debug msg */ 385 ieee80211_unref_node(&ni); 386 ic->ic_stats.is_tx_nobuf++; 387 return ENOMEM; 388 } 389 MH_ALIGN(m, sizeof(struct ieee80211_frame)); 390 m->m_pkthdr.rcvif = (void *) ni; 391 392 wh = mtod(m, struct ieee80211_frame *); 393 ieee80211_send_setup(ic, ni, wh, 394 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA, 395 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid); 396 /* NB: power management bit is never sent by an AP */ 397 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) && 398 ic->ic_opmode != IEEE80211_M_HOSTAP && 399 ic->ic_opmode != IEEE80211_M_WDS) 400 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT; 401 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame); 402 M_WME_SETAC(m, WME_AC_BE); 403 404 IEEE80211_NODE_STAT(ni, tx_data); 405 406 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 407 "[%s] send null data frame on channel %u, pwr mgt %s\n", 408 ether_sprintf(ni->ni_macaddr), 409 ieee80211_chan2ieee(ic, ic->ic_curchan), 410 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis"); 411 412 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */ 413 (*ifp->if_start)(ifp); 414 415 return 0; 416 } 417 418 /* 419 * Assign priority to a frame based on any vlan tag assigned 420 * to the station and/or any Diffserv setting in an IP header. 421 * Finally, if an ACM policy is setup (in station mode) it's 422 * applied. 423 */ 424 int 425 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) 426 { 427 int v_wme_ac, d_wme_ac, ac; 428 #ifdef INET 429 struct ether_header *eh; 430 #endif 431 432 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) { 433 ac = WME_AC_BE; 434 goto done; 435 } 436 437 /* 438 * If node has a vlan tag then all traffic 439 * to it must have a matching tag. 440 */ 441 v_wme_ac = 0; 442 if (ni->ni_vlan != 0) { 443 /* XXX used to check ec_nvlans. */ 444 struct m_tag *mtag = m_tag_find(m, PACKET_TAG_VLAN, NULL); 445 if (mtag == NULL) { 446 IEEE80211_NODE_STAT(ni, tx_novlantag); 447 return 1; 448 } 449 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) != 450 EVL_VLANOFTAG(ni->ni_vlan)) { 451 IEEE80211_NODE_STAT(ni, tx_vlanmismatch); 452 return 1; 453 } 454 /* map vlan priority to AC */ 455 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan)); 456 } 457 458 #ifdef INET 459 eh = mtod(m, struct ether_header *); 460 if (eh->ether_type == htons(ETHERTYPE_IP)) { 461 uint8_t tos; 462 /* 463 * IP frame, map the DSCP bits from the TOS field. 464 */ 465 /* XXX m_copydata may be too slow for fast path */ 466 /* NB: ip header may not be in first mbuf */ 467 m_copydata(m, sizeof(struct ether_header) + 468 offsetof(struct ip, ip_tos), sizeof(tos), &tos); 469 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */ 470 d_wme_ac = TID_TO_WME_AC(tos); 471 } else { 472 #endif /* INET */ 473 d_wme_ac = WME_AC_BE; 474 #ifdef INET 475 } 476 #endif 477 /* 478 * Use highest priority AC. 479 */ 480 if (v_wme_ac > d_wme_ac) 481 ac = v_wme_ac; 482 else 483 ac = d_wme_ac; 484 485 /* 486 * Apply ACM policy. 487 */ 488 if (ic->ic_opmode == IEEE80211_M_STA) { 489 static const int acmap[4] = { 490 WME_AC_BK, /* WME_AC_BE */ 491 WME_AC_BK, /* WME_AC_BK */ 492 WME_AC_BE, /* WME_AC_VI */ 493 WME_AC_VI, /* WME_AC_VO */ 494 }; 495 while (ac != WME_AC_BK && 496 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm) 497 ac = acmap[ac]; 498 } 499 done: 500 M_WME_SETAC(m, ac); 501 return 0; 502 } 503 504 /* 505 * Insure there is sufficient contiguous space to encapsulate the 506 * 802.11 data frame. If room isn't already there, arrange for it. 507 * Drivers and cipher modules assume we have done the necessary work 508 * and fail rudely if they don't find the space they need. 509 */ 510 static struct mbuf * 511 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize, 512 struct ieee80211_key *key, struct mbuf *m) 513 { 514 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc)) 515 int needed_space = ic->ic_headroom + hdrsize; 516 int wlen = 0; 517 518 if (key != NULL) { 519 /* XXX belongs in crypto code? */ 520 needed_space += key->wk_cipher->ic_header; 521 /* XXX frags */ 522 } 523 /* 524 * We know we are called just before stripping an Ethernet 525 * header and prepending an LLC header. This means we know 526 * there will be 527 * sizeof(struct ether_header) - sizeof(struct llc) 528 * bytes recovered to which we need additional space for the 529 * 802.11 header and any crypto header. 530 */ 531 /* XXX check trailing space and copy instead? */ 532 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) { 533 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type); 534 if (n == NULL) { 535 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 536 "%s: cannot expand storage\n", __func__); 537 ic->ic_stats.is_tx_nobuf++; 538 m_freem(m); 539 return NULL; 540 } 541 IASSERT(needed_space <= MHLEN, 542 ("not enough room, need %u got %zu\n", needed_space, MHLEN)); 543 /* 544 * Setup new mbuf to have leading space to prepend the 545 * 802.11 header and any crypto header bits that are 546 * required (the latter are added when the driver calls 547 * back to ieee80211_crypto_encap to do crypto encapsulation). 548 */ 549 /* NB: must be first 'cuz it clobbers m_data */ 550 M_MOVE_PKTHDR(n, m); 551 n->m_len = 0; /* NB: m_gethdr does not set */ 552 n->m_data += needed_space; 553 /* 554 * Pull up Ethernet header to create the expected layout. 555 * We could use m_pullup but that's overkill (i.e. we don't 556 * need the actual data) and it cannot fail so do it inline 557 * for speed. 558 */ 559 /* NB: struct ether_header is known to be contiguous */ 560 n->m_len += sizeof(struct ether_header); 561 m->m_len -= sizeof(struct ether_header); 562 m->m_data += sizeof(struct ether_header); 563 /* 564 * Replace the head of the chain. 565 */ 566 n->m_next = m; 567 m = n; 568 } else { 569 /* We will overwrite the ethernet header in the 570 * 802.11 encapsulation stage. Make sure that it 571 * is writable. 572 */ 573 wlen = sizeof(struct ether_header); 574 } 575 576 /* 577 * If we're going to s/w encrypt the mbuf chain make sure it is 578 * writable. 579 */ 580 if (key != NULL && (key->wk_flags & IEEE80211_KEY_SWCRYPT) != 0) 581 wlen = M_COPYALL; 582 583 if (wlen != 0 && m_makewritable(&m, 0, wlen, M_DONTWAIT) != 0) { 584 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 585 "%s: cannot get writable mbuf\n", __func__); 586 ic->ic_stats.is_tx_nobuf++; /* XXX new stat */ 587 m_freem(m); 588 return NULL; 589 } 590 return m; 591 #undef TO_BE_RECLAIMED 592 } 593 594 /* 595 * Return the transmit key to use in sending a unicast frame. 596 * If a unicast key is set we use that. When no unicast key is set 597 * we fall back to the default transmit key. 598 */ 599 static __inline struct ieee80211_key * 600 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni) 601 { 602 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) { 603 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 604 IEEE80211_KEY_UNDEFINED(&ic->ic_nw_keys[ic->ic_def_txkey])) 605 return NULL; 606 return &ic->ic_nw_keys[ic->ic_def_txkey]; 607 } else { 608 return &ni->ni_ucastkey; 609 } 610 } 611 612 /* 613 * Return the transmit key to use in sending a multicast frame. 614 * Multicast traffic always uses the group key which is installed as 615 * the default tx key. 616 */ 617 static __inline struct ieee80211_key * 618 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, 619 struct ieee80211_node *ni) 620 { 621 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE || 622 IEEE80211_KEY_UNDEFINED(&ic->ic_nw_keys[ic->ic_def_txkey])) 623 return NULL; 624 return &ic->ic_nw_keys[ic->ic_def_txkey]; 625 } 626 627 /* 628 * Encapsulate an outbound data frame. The mbuf chain is updated. 629 * If an error is encountered NULL is returned. The caller is required 630 * to provide a node reference and pullup the ethernet header in the 631 * first mbuf. 632 */ 633 struct mbuf * 634 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m, 635 struct ieee80211_node *ni) 636 { 637 struct ether_header eh; 638 struct ieee80211_frame *wh; 639 struct ieee80211_key *key; 640 struct llc *llc; 641 int hdrsize, datalen, addqos, txfrag, isff; 642 643 /* 644 * Copy existing Ethernet header to a safe place. The 645 * rest of the code assumes it's ok to strip it when 646 * reorganizing state for the final encapsulation. 647 */ 648 IASSERT(m->m_len >= sizeof(eh), ("no ethernet header!")); 649 memcpy(&eh, mtod(m, void *), sizeof(struct ether_header)); 650 651 /* 652 * Insure space for additional headers. First identify 653 * transmit key to use in calculating any buffer adjustments 654 * required. This is also used below to do privacy 655 * encapsulation work. Then calculate the 802.11 header 656 * size and any padding required by the driver. 657 * 658 * Note key may be NULL if we fall back to the default 659 * transmit key and that is not set. In that case the 660 * buffer may not be expanded as needed by the cipher 661 * routines, but they will/should discard it. 662 */ 663 if (ic->ic_flags & IEEE80211_F_PRIVACY) { 664 if (ic->ic_opmode == IEEE80211_M_STA || 665 !IEEE80211_IS_MULTICAST(eh.ether_dhost)) 666 key = ieee80211_crypto_getucastkey(ic, ni); 667 else 668 key = ieee80211_crypto_getmcastkey(ic, ni); 669 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) { 670 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO, 671 "[%s] no default transmit key (%s) deftxkey %u\n", 672 ether_sprintf(eh.ether_dhost), __func__, 673 ic->ic_def_txkey); 674 ic->ic_stats.is_tx_nodefkey++; 675 goto bad; 676 } 677 } else 678 key = NULL; 679 /* XXX 4-address format */ 680 /* 681 * XXX Some ap's don't handle QoS-encapsulated EAPOL 682 * frames so suppress use. This may be an issue if other 683 * ap's require all data frames to be QoS-encapsulated 684 * once negotiated in which case we'll need to make this 685 * configurable. 686 */ 687 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) && 688 eh.ether_type != htons(ETHERTYPE_PAE); 689 if (addqos) 690 hdrsize = sizeof(struct ieee80211_qosframe); 691 else 692 hdrsize = sizeof(struct ieee80211_frame); 693 if (ic->ic_flags & IEEE80211_F_DATAPAD) 694 hdrsize = roundup(hdrsize, sizeof(uint32_t)); 695 696 if ((isff = m->m_flags & M_FF) != 0) { 697 struct mbuf *m2; 698 struct ether_header eh2; 699 700 /* 701 * Fast frame encapsulation. There must be two packets 702 * chained with m_nextpkt. We do header adjustment for 703 * each, add the tunnel encapsulation, and then concatenate 704 * the mbuf chains to form a single frame for transmission. 705 */ 706 m2 = m->m_nextpkt; 707 if (m2 == NULL) { 708 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 709 "%s: only one frame\n", __func__); 710 goto bad; 711 } 712 m->m_nextpkt = NULL; 713 /* 714 * Include fast frame headers in adjusting header 715 * layout; this allocates space according to what 716 * ieee80211_encap_fastframe will do. 717 */ 718 m = ieee80211_mbuf_adjust(ic, 719 hdrsize + sizeof(struct llc) + sizeof(uint32_t) + 2 + 720 sizeof(struct ether_header), 721 key, m); 722 if (m == NULL) { 723 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 724 m_freem(m2); 725 goto bad; 726 } 727 /* 728 * Copy second frame's Ethernet header out of line 729 * and adjust for encapsulation headers. Note that 730 * we make room for padding in case there isn't room 731 * at the end of first frame. 732 */ 733 IASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 734 memcpy(&eh2, mtod(m2, void *), sizeof(struct ether_header)); 735 m2 = ieee80211_mbuf_adjust(ic, 736 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 737 NULL, m2); 738 if (m2 == NULL) { 739 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 740 goto bad; 741 } 742 m = ieee80211_encap_fastframe(ic, m, &eh, m2, &eh2); 743 if (m == NULL) 744 goto bad; 745 } else { 746 /* 747 * Normal frame. 748 */ 749 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m); 750 if (m == NULL) { 751 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 752 goto bad; 753 } 754 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */ 755 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 756 llc = mtod(m, struct llc *); 757 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 758 llc->llc_control = LLC_UI; 759 llc->llc_snap.org_code[0] = 0; 760 llc->llc_snap.org_code[1] = 0; 761 llc->llc_snap.org_code[2] = 0; 762 llc->llc_snap.ether_type = eh.ether_type; 763 } 764 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */ 765 766 M_PREPEND(m, hdrsize, M_DONTWAIT); 767 if (m == NULL) { 768 ic->ic_stats.is_tx_nobuf++; 769 goto bad; 770 } 771 wh = mtod(m, struct ieee80211_frame *); 772 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA; 773 *(uint16_t *)wh->i_dur = 0; 774 switch (ic->ic_opmode) { 775 case IEEE80211_M_STA: 776 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS; 777 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid); 778 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 779 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost); 780 break; 781 case IEEE80211_M_IBSS: 782 case IEEE80211_M_AHDEMO: 783 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 784 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 785 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost); 786 /* 787 * NB: always use the bssid from ic_bss as the 788 * neighbor's may be stale after an ibss merge 789 */ 790 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid); 791 break; 792 case IEEE80211_M_HOSTAP: 793 #ifndef IEEE80211_NO_HOSTAP 794 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS; 795 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost); 796 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid); 797 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost); 798 #endif /* !IEEE80211_NO_HOSTAP */ 799 break; 800 case IEEE80211_M_MONITOR: 801 case IEEE80211_M_WDS: 802 goto bad; 803 } 804 if (m->m_flags & M_MORE_DATA) 805 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; 806 if (addqos) { 807 struct ieee80211_qosframe *qwh = 808 (struct ieee80211_qosframe *) wh; 809 int ac, tid; 810 811 ac = M_WME_GETAC(m); 812 /* map from access class/queue to 11e header priorty value */ 813 tid = WME_AC_TO_TID(ac); 814 qwh->i_qos[0] = tid & IEEE80211_QOS_TID; 815 /* 816 * Check if A-MPDU tx aggregation is setup or if we 817 * should try to enable it. The sta must be associated 818 * with HT and A-MPDU enabled for use. On the first 819 * frame that goes out We issue an ADDBA request and 820 * wait for a reply. The frame being encapsulated 821 * will go out w/o using A-MPDU, or possibly it might 822 * be collected by the driver and held/retransmit. 823 * ieee80211_ampdu_request handles staggering requests 824 * in case the receiver NAK's us or we are otherwise 825 * unable to establish a BA stream. 826 */ 827 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) && 828 (ic->ic_flags_ext & IEEE80211_FEXT_AMPDU_TX)) { 829 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac]; 830 831 if (IEEE80211_AMPDU_RUNNING(tap)) { 832 /* 833 * Operational, mark frame for aggregation. 834 */ 835 qwh->i_qos[0] |= IEEE80211_QOS_ACKPOLICY_BA; 836 } else if (!IEEE80211_AMPDU_REQUESTED(tap)) { 837 /* 838 * Not negotiated yet, request service. 839 */ 840 ieee80211_ampdu_request(ni, tap); 841 } 842 } 843 /* XXX works even when BA marked above */ 844 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy) 845 qwh->i_qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK; 846 qwh->i_qos[1] = 0; 847 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS; 848 849 *(uint16_t *)wh->i_seq = 850 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT); 851 ni->ni_txseqs[tid]++; 852 } else { 853 *(uint16_t *)wh->i_seq = 854 htole16(ni->ni_txseqs[IEEE80211_NONQOS_TID] << IEEE80211_SEQ_SEQ_SHIFT); 855 ni->ni_txseqs[IEEE80211_NONQOS_TID]++; 856 } 857 /* check if xmit fragmentation is required */ 858 txfrag = (m->m_pkthdr.len > ic->ic_fragthreshold && 859 !IEEE80211_IS_MULTICAST(wh->i_addr1) && 860 (ic->ic_caps & IEEE80211_C_TXFRAG) && 861 !isff); /* NB: don't fragment ff's */ 862 if (key != NULL) { 863 /* 864 * IEEE 802.1X: send EAPOL frames always in the clear. 865 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set. 866 */ 867 if (eh.ether_type != htons(ETHERTYPE_PAE) || 868 ((ic->ic_flags & IEEE80211_F_WPA) && 869 (ic->ic_opmode == IEEE80211_M_STA ? 870 !IEEE80211_KEY_UNDEFINED(key) : 871 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) { 872 wh->i_fc[1] |= IEEE80211_FC1_WEP; 873 if (!ieee80211_crypto_enmic(ic, key, m, txfrag)) { 874 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT, 875 "[%s] enmic failed, discard frame\n", 876 ether_sprintf(eh.ether_dhost)); 877 ic->ic_stats.is_crypto_enmicfail++; 878 goto bad; 879 } 880 } 881 } 882 /* 883 * NB: frag flags may leak from above; they should only 884 * be set on return to the caller if we fragment at 885 * the 802.11 layer. 886 */ 887 m->m_flags &= ~(M_FRAG | M_FIRSTFRAG); 888 if (txfrag && !ieee80211_fragment(ic, m, hdrsize, 889 key != NULL ? key->wk_cipher->ic_header : 0, ic->ic_fragthreshold)) 890 goto bad; 891 892 IEEE80211_NODE_STAT(ni, tx_data); 893 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) 894 IEEE80211_NODE_STAT(ni, tx_mcast); 895 else 896 IEEE80211_NODE_STAT(ni, tx_ucast); 897 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen); 898 899 return m; 900 bad: 901 if (m != NULL) 902 m_freem(m); 903 return NULL; 904 } 905 906 /* 907 * Arguments in: 908 * 909 * paylen: payload length (no FCS, no WEP header) 910 * 911 * hdrlen: header length 912 * 913 * rate: MSDU speed, units 500kb/s 914 * 915 * flags: IEEE80211_F_SHPREAMBLE (use short preamble), 916 * IEEE80211_F_SHSLOT (use short slot length) 917 * 918 * Arguments out: 919 * 920 * d: 802.11 Duration field for RTS, 921 * 802.11 Duration field for data frame, 922 * PLCP Length for data frame, 923 * residual octets at end of data slot 924 */ 925 static int 926 ieee80211_compute_duration1(int len, int use_ack, uint32_t icflags, int rate, 927 struct ieee80211_duration *d) 928 { 929 int pre, ctsrate; 930 int ack, bitlen, data_dur, remainder; 931 932 /* RTS reserves medium for SIFS | CTS | SIFS | (DATA) | SIFS | ACK 933 * DATA reserves medium for SIFS | ACK 934 * 935 * XXXMYC: no ACK on multicast/broadcast or control packets 936 */ 937 938 bitlen = len * 8; 939 940 pre = IEEE80211_DUR_DS_SIFS; 941 if ((icflags & IEEE80211_F_SHPREAMBLE) != 0) 942 pre += IEEE80211_DUR_DS_SHORT_PREAMBLE + IEEE80211_DUR_DS_FAST_PLCPHDR; 943 else 944 pre += IEEE80211_DUR_DS_LONG_PREAMBLE + IEEE80211_DUR_DS_SLOW_PLCPHDR; 945 946 d->d_residue = 0; 947 data_dur = (bitlen * 2) / rate; 948 remainder = (bitlen * 2) % rate; 949 if (remainder != 0) { 950 d->d_residue = (rate - remainder) / 16; 951 data_dur++; 952 } 953 954 switch (rate) { 955 case 2: /* 1 Mb/s */ 956 case 4: /* 2 Mb/s */ 957 /* 1 - 2 Mb/s WLAN: send ACK/CTS at 1 Mb/s */ 958 ctsrate = 2; 959 break; 960 case 11: /* 5.5 Mb/s */ 961 case 22: /* 11 Mb/s */ 962 case 44: /* 22 Mb/s */ 963 /* 5.5 - 11 Mb/s WLAN: send ACK/CTS at 2 Mb/s */ 964 ctsrate = 4; 965 break; 966 default: 967 /* TBD */ 968 return -1; 969 } 970 971 d->d_plcp_len = data_dur; 972 973 ack = (use_ack) ? pre + (IEEE80211_DUR_DS_SLOW_ACK * 2) / ctsrate : 0; 974 975 d->d_rts_dur = 976 pre + (IEEE80211_DUR_DS_SLOW_CTS * 2) / ctsrate + 977 pre + data_dur + 978 ack; 979 980 d->d_data_dur = ack; 981 982 return 0; 983 } 984 985 /* 986 * Arguments in: 987 * 988 * wh: 802.11 header 989 * 990 * paylen: payload length (no FCS, no WEP header) 991 * 992 * rate: MSDU speed, units 500kb/s 993 * 994 * fraglen: fragment length, set to maximum (or higher) for no 995 * fragmentation 996 * 997 * flags: IEEE80211_F_PRIVACY (hardware adds WEP), 998 * IEEE80211_F_SHPREAMBLE (use short preamble), 999 * IEEE80211_F_SHSLOT (use short slot length) 1000 * 1001 * Arguments out: 1002 * 1003 * d0: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 1004 * of first/only fragment 1005 * 1006 * dn: 802.11 Duration fields (RTS/Data), PLCP Length, Service fields 1007 * of last fragment 1008 * 1009 * ieee80211_compute_duration assumes crypto-encapsulation, if any, 1010 * has already taken place. 1011 */ 1012 int 1013 ieee80211_compute_duration(const struct ieee80211_frame_min *wh, 1014 const struct ieee80211_key *wk, int len, 1015 uint32_t icflags, int fraglen, int rate, struct ieee80211_duration *d0, 1016 struct ieee80211_duration *dn, int *npktp, int debug) 1017 { 1018 int ack, rc; 1019 int cryptolen, /* crypto overhead: header+trailer */ 1020 firstlen, /* first fragment's payload + overhead length */ 1021 hdrlen, /* header length w/o driver padding */ 1022 lastlen, /* last fragment's payload length w/ overhead */ 1023 lastlen0, /* last fragment's payload length w/o overhead */ 1024 npkt, /* number of fragments */ 1025 overlen, /* non-802.11 header overhead per fragment */ 1026 paylen; /* payload length w/o overhead */ 1027 1028 hdrlen = ieee80211_anyhdrsize((const void *)wh); 1029 1030 /* Account for padding required by the driver. */ 1031 if (icflags & IEEE80211_F_DATAPAD) 1032 paylen = len - roundup(hdrlen, sizeof(u_int32_t)); 1033 else 1034 paylen = len - hdrlen; 1035 1036 overlen = IEEE80211_CRC_LEN; 1037 1038 if (wk != NULL) { 1039 cryptolen = wk->wk_cipher->ic_header + 1040 wk->wk_cipher->ic_trailer; 1041 paylen -= cryptolen; 1042 overlen += cryptolen; 1043 } 1044 1045 npkt = paylen / fraglen; 1046 lastlen0 = paylen % fraglen; 1047 1048 if (npkt == 0) /* no fragments */ 1049 lastlen = paylen + overlen; 1050 else if (lastlen0 != 0) { /* a short "tail" fragment */ 1051 lastlen = lastlen0 + overlen; 1052 npkt++; 1053 } else /* full-length "tail" fragment */ 1054 lastlen = fraglen + overlen; 1055 1056 if (npktp != NULL) 1057 *npktp = npkt; 1058 1059 if (npkt > 1) 1060 firstlen = fraglen + overlen; 1061 else 1062 firstlen = paylen + overlen; 1063 1064 if (debug) { 1065 printf("%s: npkt %d firstlen %d lastlen0 %d lastlen %d " 1066 "fraglen %d overlen %d len %d rate %d icflags %08x\n", 1067 __func__, npkt, firstlen, lastlen0, lastlen, fraglen, 1068 overlen, len, rate, icflags); 1069 } 1070 1071 ack = !IEEE80211_IS_MULTICAST(wh->i_addr1) && 1072 (wh->i_fc[1] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL; 1073 1074 rc = ieee80211_compute_duration1(firstlen + hdrlen, 1075 ack, icflags, rate, d0); 1076 if (rc == -1) 1077 return rc; 1078 1079 if (npkt <= 1) { 1080 *dn = *d0; 1081 return 0; 1082 } 1083 return ieee80211_compute_duration1(lastlen + hdrlen, ack, icflags, rate, 1084 dn); 1085 } 1086 1087 /* 1088 * Do Ethernet-LLC encapsulation for each payload in a fast frame 1089 * tunnel encapsulation. The frame is assumed to have an Ethernet 1090 * header at the front that must be stripped before prepending the 1091 * LLC followed by the Ethernet header passed in (with an Ethernet 1092 * type that specifies the payload size). 1093 */ 1094 static struct mbuf * 1095 ieee80211_encap1(struct ieee80211com *ic, struct mbuf *m, 1096 const struct ether_header *eh) 1097 { 1098 struct llc *llc; 1099 uint16_t payload; 1100 1101 /* XXX optimize by combining m_adj+M_PREPEND */ 1102 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 1103 llc = mtod(m, struct llc *); 1104 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1105 llc->llc_control = LLC_UI; 1106 llc->llc_snap.org_code[0] = 0; 1107 llc->llc_snap.org_code[1] = 0; 1108 llc->llc_snap.org_code[2] = 0; 1109 llc->llc_snap.ether_type = eh->ether_type; 1110 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 1111 1112 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1113 if (m == NULL) { /* XXX cannot happen */ 1114 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 1115 "%s: no space for ether_header\n", __func__); 1116 ic->ic_stats.is_tx_nobuf++; 1117 return NULL; 1118 } 1119 ETHER_HEADER_COPY(mtod(m, void *), eh); 1120 mtod(m, struct ether_header *)->ether_type = htons(payload); 1121 return m; 1122 } 1123 1124 /* 1125 * Do fast frame tunnel encapsulation. The two frames and 1126 * Ethernet headers are supplied. The caller is assumed to 1127 * have arrange for space in the mbuf chains for encapsulating 1128 * headers (to avoid major mbuf fragmentation). 1129 * 1130 * The encapsulated frame is returned or NULL if there is a 1131 * problem (should not happen). 1132 */ 1133 static struct mbuf * 1134 ieee80211_encap_fastframe(struct ieee80211com *ic, 1135 struct mbuf *m1, const struct ether_header *eh1, 1136 struct mbuf *m2, const struct ether_header *eh2) 1137 { 1138 struct llc *llc; 1139 struct mbuf *m; 1140 int pad; 1141 1142 /* 1143 * First, each frame gets a standard encapsulation. 1144 */ 1145 m1 = ieee80211_encap1(ic, m1, eh1); 1146 if (m1 == NULL) { 1147 m_freem(m2); 1148 return NULL; 1149 } 1150 m2 = ieee80211_encap1(ic, m2, eh2); 1151 if (m2 == NULL) { 1152 m_freem(m1); 1153 return NULL; 1154 } 1155 1156 /* 1157 * Pad leading frame to a 4-byte boundary. If there 1158 * is space at the end of the first frame, put it 1159 * there; otherwise prepend to the front of the second 1160 * frame. We know doing the second will always work 1161 * because we reserve space above. We prefer appending 1162 * as this typically has better DMA alignment properties. 1163 */ 1164 for (m = m1; m->m_next != NULL; m = m->m_next) 1165 ; 1166 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 1167 if (pad) { 1168 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 1169 m2->m_data -= pad; 1170 m2->m_len += pad; 1171 m2->m_pkthdr.len += pad; 1172 } else { /* append to first */ 1173 m->m_len += pad; 1174 m1->m_pkthdr.len += pad; 1175 } 1176 } 1177 1178 /* 1179 * Now, stick 'em together and prepend the tunnel headers; 1180 * first the Atheros tunnel header (all zero for now) and 1181 * then a special fast frame LLC. 1182 * 1183 * XXX optimize by prepending together 1184 */ 1185 m->m_next = m2; /* NB: last mbuf from above */ 1186 m1->m_pkthdr.len += m2->m_pkthdr.len; 1187 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 1188 if (m1 == NULL) { /* XXX cannot happen */ 1189 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 1190 "%s: no space for tunnel header\n", __func__); 1191 ic->ic_stats.is_tx_nobuf++; 1192 return NULL; 1193 } 1194 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 1195 1196 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 1197 if (m1 == NULL) { /* XXX cannot happen */ 1198 IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, 1199 "%s: no space for llc header\n", __func__); 1200 ic->ic_stats.is_tx_nobuf++; 1201 return NULL; 1202 } 1203 llc = mtod(m1, struct llc *); 1204 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 1205 llc->llc_control = LLC_UI; 1206 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 1207 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 1208 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 1209 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 1210 1211 ic->ic_stats.is_ff_encap++; 1212 1213 return m1; 1214 } 1215 1216 /* 1217 * Fragment the frame according to the specified mtu. 1218 * The size of the 802.11 header (w/o padding) is provided 1219 * so we don't need to recalculate it. We create a new 1220 * mbuf for each fragment and chain it through m_nextpkt; 1221 * we might be able to optimize this by reusing the original 1222 * packet's mbufs but that is significantly more complicated. 1223 */ 1224 static int 1225 ieee80211_fragment(struct ieee80211com *ic, struct mbuf *m0, 1226 u_int hdrsize, u_int ciphdrsize, u_int mtu) 1227 { 1228 struct ieee80211_frame *wh, *whf; 1229 struct mbuf *m, *prev, *next; 1230 u_int totalhdrsize, fragno, fragsize, off, remainder, payload; 1231 1232 IASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?")); 1233 IASSERT(m0->m_pkthdr.len > mtu, 1234 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu)); 1235 1236 wh = mtod(m0, struct ieee80211_frame *); 1237 /* NB: mark the first frag; it will be propagated below */ 1238 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG; 1239 totalhdrsize = hdrsize + ciphdrsize; 1240 fragno = 1; 1241 off = mtu - ciphdrsize; 1242 remainder = m0->m_pkthdr.len - off; 1243 prev = m0; 1244 do { 1245 fragsize = totalhdrsize + remainder; 1246 if (fragsize > mtu) 1247 fragsize = mtu; 1248 IASSERT(fragsize < MCLBYTES, 1249 ("fragment size %u too big!", fragsize)); 1250 if (fragsize > MHLEN) 1251 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR); 1252 else 1253 m = m_gethdr(M_DONTWAIT, MT_DATA); 1254 if (m == NULL) 1255 goto bad; 1256 /* leave room to prepend any cipher header */ 1257 m_align(m, fragsize - ciphdrsize); 1258 1259 /* 1260 * Form the header in the fragment. Note that since 1261 * we mark the first fragment with the MORE_FRAG bit 1262 * it automatically is propagated to each fragment; we 1263 * need only clear it on the last fragment (done below). 1264 */ 1265 whf = mtod(m, struct ieee80211_frame *); 1266 memcpy(whf, wh, hdrsize); 1267 *(u_int16_t *)&whf->i_seq[0] |= htole16( 1268 (fragno & IEEE80211_SEQ_FRAG_MASK) << 1269 IEEE80211_SEQ_FRAG_SHIFT); 1270 fragno++; 1271 1272 payload = fragsize - totalhdrsize; 1273 /* NB: destination is known to be contiguous */ 1274 m_copydata(m0, off, payload, mtod(m, u_int8_t *) + hdrsize); 1275 m->m_len = hdrsize + payload; 1276 m->m_pkthdr.len = hdrsize + payload; 1277 m->m_flags |= M_FRAG; 1278 1279 /* chain up the fragment */ 1280 prev->m_nextpkt = m; 1281 prev = m; 1282 1283 /* deduct fragment just formed */ 1284 remainder -= payload; 1285 off += payload; 1286 } while (remainder != 0); 1287 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG; 1288 1289 /* strip first mbuf now that everything has been copied */ 1290 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize))); 1291 m0->m_flags |= M_FIRSTFRAG | M_FRAG; 1292 1293 ic->ic_stats.is_tx_fragframes++; 1294 ic->ic_stats.is_tx_frags += fragno-1; 1295 1296 return 1; 1297 bad: 1298 /* reclaim fragments but leave original frame for caller to free */ 1299 for (m = m0->m_nextpkt; m != NULL; m = next) { 1300 next = m->m_nextpkt; 1301 m->m_nextpkt = NULL; /* XXX paranoid */ 1302 m_freem(m); 1303 } 1304 m0->m_nextpkt = NULL; 1305 return 0; 1306 } 1307 1308 /* 1309 * Add a supported rates element id to a frame. 1310 */ 1311 static uint8_t * 1312 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs) 1313 { 1314 int nrates; 1315 1316 *frm++ = IEEE80211_ELEMID_RATES; 1317 nrates = rs->rs_nrates; 1318 if (nrates > IEEE80211_RATE_SIZE) 1319 nrates = IEEE80211_RATE_SIZE; 1320 *frm++ = nrates; 1321 memcpy(frm, rs->rs_rates, nrates); 1322 return frm + nrates; 1323 } 1324 1325 /* 1326 * Add an extended supported rates element id to a frame. 1327 */ 1328 static uint8_t * 1329 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs) 1330 { 1331 /* 1332 * Add an extended supported rates element if operating in 11g mode. 1333 */ 1334 if (rs->rs_nrates > IEEE80211_RATE_SIZE) { 1335 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE; 1336 *frm++ = IEEE80211_ELEMID_XRATES; 1337 *frm++ = nrates; 1338 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates); 1339 frm += nrates; 1340 } 1341 return frm; 1342 } 1343 1344 /* 1345 * Add an ssid elemet to a frame. 1346 */ 1347 static uint8_t * 1348 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len) 1349 { 1350 *frm++ = IEEE80211_ELEMID_SSID; 1351 *frm++ = len; 1352 memcpy(frm, ssid, len); 1353 return frm + len; 1354 } 1355 1356 /* 1357 * Add an erp element to a frame. 1358 */ 1359 static uint8_t * 1360 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic) 1361 { 1362 uint8_t erp; 1363 1364 *frm++ = IEEE80211_ELEMID_ERP; 1365 *frm++ = 1; 1366 erp = 0; 1367 if (ic->ic_nonerpsta != 0) 1368 erp |= IEEE80211_ERP_NON_ERP_PRESENT; 1369 if (ic->ic_flags & IEEE80211_F_USEPROT) 1370 erp |= IEEE80211_ERP_USE_PROTECTION; 1371 if (ic->ic_flags & IEEE80211_F_USEBARKER) 1372 erp |= IEEE80211_ERP_LONG_PREAMBLE; 1373 *frm++ = erp; 1374 return frm; 1375 } 1376 1377 static uint8_t * 1378 ieee80211_setup_wpa_ie(struct ieee80211com *ic, uint8_t *ie) 1379 { 1380 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2 1381 #define ADDSHORT(frm, v) do { \ 1382 frm[0] = (v) & 0xff; \ 1383 frm[1] = (v) >> 8; \ 1384 frm += 2; \ 1385 } while (0) 1386 #define ADDSELECTOR(frm, sel) do { \ 1387 memcpy(frm, sel, 4); \ 1388 frm += 4; \ 1389 } while (0) 1390 static const uint8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE }; 1391 static const uint8_t cipher_suite[][4] = { 1392 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */ 1393 { WPA_OUI_BYTES, WPA_CSE_TKIP }, 1394 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */ 1395 { WPA_OUI_BYTES, WPA_CSE_CCMP }, 1396 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 1397 { WPA_OUI_BYTES, WPA_CSE_NULL }, 1398 }; 1399 static const uint8_t wep104_suite[4] = 1400 { WPA_OUI_BYTES, WPA_CSE_WEP104 }; 1401 static const uint8_t key_mgt_unspec[4] = 1402 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC }; 1403 static const uint8_t key_mgt_psk[4] = 1404 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK }; 1405 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 1406 uint8_t *frm = ie; 1407 uint8_t *selcnt; 1408 1409 *frm++ = IEEE80211_ELEMID_VENDOR; 1410 *frm++ = 0; /* length filled in below */ 1411 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */ 1412 frm += sizeof(oui); 1413 ADDSHORT(frm, WPA_VERSION); 1414 1415 /* XXX filter out CKIP */ 1416 1417 /* multicast cipher */ 1418 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 1419 rsn->rsn_mcastkeylen >= 13) 1420 ADDSELECTOR(frm, wep104_suite); 1421 else 1422 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 1423 1424 /* unicast cipher list */ 1425 selcnt = frm; 1426 ADDSHORT(frm, 0); /* selector count */ 1427 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 1428 selcnt[0]++; 1429 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 1430 } 1431 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 1432 selcnt[0]++; 1433 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 1434 } 1435 1436 /* authenticator selector list */ 1437 selcnt = frm; 1438 ADDSHORT(frm, 0); /* selector count */ 1439 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 1440 selcnt[0]++; 1441 ADDSELECTOR(frm, key_mgt_unspec); 1442 } 1443 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 1444 selcnt[0]++; 1445 ADDSELECTOR(frm, key_mgt_psk); 1446 } 1447 1448 /* optional capabilities */ 1449 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH) 1450 ADDSHORT(frm, rsn->rsn_caps); 1451 1452 /* calculate element length */ 1453 ie[1] = frm - ie - 2; 1454 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1455 ("WPA IE too big, %u > %zu", 1456 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1457 return frm; 1458 #undef ADDSHORT 1459 #undef ADDSELECTOR 1460 #undef WPA_OUI_BYTES 1461 } 1462 1463 static uint8_t * 1464 ieee80211_setup_rsn_ie(struct ieee80211com *ic, uint8_t *ie) 1465 { 1466 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac 1467 #define ADDSHORT(frm, v) do { \ 1468 frm[0] = (v) & 0xff; \ 1469 frm[1] = (v) >> 8; \ 1470 frm += 2; \ 1471 } while (0) 1472 #define ADDSELECTOR(frm, sel) do { \ 1473 memcpy(frm, sel, 4); \ 1474 frm += 4; \ 1475 } while (0) 1476 static const uint8_t cipher_suite[][4] = { 1477 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */ 1478 { RSN_OUI_BYTES, RSN_CSE_TKIP }, 1479 { RSN_OUI_BYTES, RSN_CSE_WRAP }, 1480 { RSN_OUI_BYTES, RSN_CSE_CCMP }, 1481 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */ 1482 { RSN_OUI_BYTES, RSN_CSE_NULL }, 1483 }; 1484 static const uint8_t wep104_suite[4] = 1485 { RSN_OUI_BYTES, RSN_CSE_WEP104 }; 1486 static const uint8_t key_mgt_unspec[4] = 1487 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC }; 1488 static const uint8_t key_mgt_psk[4] = 1489 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK }; 1490 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn; 1491 uint8_t *frm = ie; 1492 uint8_t *selcnt; 1493 1494 *frm++ = IEEE80211_ELEMID_RSN; 1495 *frm++ = 0; /* length filled in below */ 1496 ADDSHORT(frm, RSN_VERSION); 1497 1498 /* XXX filter out CKIP */ 1499 1500 /* multicast cipher */ 1501 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP && 1502 rsn->rsn_mcastkeylen >= 13) 1503 ADDSELECTOR(frm, wep104_suite); 1504 else 1505 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]); 1506 1507 /* unicast cipher list */ 1508 selcnt = frm; 1509 ADDSHORT(frm, 0); /* selector count */ 1510 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) { 1511 selcnt[0]++; 1512 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]); 1513 } 1514 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) { 1515 selcnt[0]++; 1516 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]); 1517 } 1518 1519 /* authenticator selector list */ 1520 selcnt = frm; 1521 ADDSHORT(frm, 0); /* selector count */ 1522 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) { 1523 selcnt[0]++; 1524 ADDSELECTOR(frm, key_mgt_unspec); 1525 } 1526 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) { 1527 selcnt[0]++; 1528 ADDSELECTOR(frm, key_mgt_psk); 1529 } 1530 1531 /* optional capabilities */ 1532 ADDSHORT(frm, rsn->rsn_caps); 1533 /* XXX PMKID */ 1534 1535 /* calculate element length */ 1536 ie[1] = frm - ie - 2; 1537 IASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa), 1538 ("RSN IE too big, %u > %zu", 1539 ie[1]+2, sizeof(struct ieee80211_ie_wpa))); 1540 return frm; 1541 #undef ADDSELECTOR 1542 #undef ADDSHORT 1543 #undef RSN_OUI_BYTES 1544 } 1545 1546 /* 1547 * Add a WPA/RSN element to a frame. 1548 */ 1549 static uint8_t * 1550 ieee80211_add_wpa(uint8_t *frm, struct ieee80211com *ic) 1551 { 1552 1553 IASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!")); 1554 if (ic->ic_flags & IEEE80211_F_WPA2) 1555 frm = ieee80211_setup_rsn_ie(ic, frm); 1556 if (ic->ic_flags & IEEE80211_F_WPA1) 1557 frm = ieee80211_setup_wpa_ie(ic, frm); 1558 return frm; 1559 } 1560 1561 #define WME_OUI_BYTES 0x00, 0x50, 0xf2 1562 /* 1563 * Add a WME information element to a frame. 1564 */ 1565 static uint8_t * 1566 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme) 1567 { 1568 static const struct ieee80211_wme_info info = { 1569 .wme_id = IEEE80211_ELEMID_VENDOR, 1570 .wme_len = sizeof(struct ieee80211_wme_info) - 2, 1571 .wme_oui = { WME_OUI_BYTES }, 1572 .wme_type = WME_OUI_TYPE, 1573 .wme_subtype = WME_INFO_OUI_SUBTYPE, 1574 .wme_version = WME_VERSION, 1575 .wme_info = 0, 1576 }; 1577 memcpy(frm, &info, sizeof(info)); 1578 return frm + sizeof(info); 1579 } 1580 1581 /* 1582 * Add a WME parameters element to a frame. 1583 */ 1584 static uint8_t * 1585 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme) 1586 { 1587 #define SM(_v, _f) (((_v) << _f##_S) & _f) 1588 #define ADDSHORT(frm, v) do { \ 1589 frm[0] = (v) & 0xff; \ 1590 frm[1] = (v) >> 8; \ 1591 frm += 2; \ 1592 } while (0) 1593 /* NB: this works 'cuz a param has an info at the front */ 1594 static const struct ieee80211_wme_info param = { 1595 .wme_id = IEEE80211_ELEMID_VENDOR, 1596 .wme_len = sizeof(struct ieee80211_wme_param) - 2, 1597 .wme_oui = { WME_OUI_BYTES }, 1598 .wme_type = WME_OUI_TYPE, 1599 .wme_subtype = WME_PARAM_OUI_SUBTYPE, 1600 .wme_version = WME_VERSION, 1601 }; 1602 int i; 1603 1604 memcpy(frm, ¶m, sizeof(param)); 1605 frm += __offsetof(struct ieee80211_wme_info, wme_info); 1606 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */ 1607 *frm++ = 0; /* reserved field */ 1608 for (i = 0; i < WME_NUM_AC; i++) { 1609 const struct wmeParams *ac = 1610 &wme->wme_bssChanParams.cap_wmeParams[i]; 1611 *frm++ = SM(i, WME_PARAM_ACI) 1612 | SM(ac->wmep_acm, WME_PARAM_ACM) 1613 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN) 1614 ; 1615 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX) 1616 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN) 1617 ; 1618 ADDSHORT(frm, ac->wmep_txopLimit); 1619 } 1620 return frm; 1621 #undef SM 1622 #undef ADDSHORT 1623 } 1624 #undef WME_OUI_BYTES 1625 1626 #define ATH_OUI_BYTES 0x00, 0x03, 0x7f 1627 /* 1628 * Add a WME information element to a frame. 1629 */ 1630 static uint8_t * 1631 ieee80211_add_ath(uint8_t *frm, uint8_t caps, uint16_t defkeyix) 1632 { 1633 static const struct ieee80211_ath_ie info = { 1634 .ath_id = IEEE80211_ELEMID_VENDOR, 1635 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 1636 .ath_oui = { ATH_OUI_BYTES }, 1637 .ath_oui_type = ATH_OUI_TYPE, 1638 .ath_oui_subtype= ATH_OUI_SUBTYPE, 1639 .ath_version = ATH_OUI_VERSION, 1640 }; 1641 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 1642 1643 memcpy(frm, &info, sizeof(info)); 1644 ath->ath_capability = caps; 1645 ath->ath_defkeyix[0] = (defkeyix & 0xff); 1646 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 1647 return frm + sizeof(info); 1648 } 1649 #undef ATH_OUI_BYTES 1650 1651 /* 1652 * Send a probe request frame with the specified ssid 1653 * and any optional information element data. 1654 */ 1655 int 1656 ieee80211_send_probereq(struct ieee80211_node *ni, 1657 const uint8_t sa[IEEE80211_ADDR_LEN], 1658 const uint8_t da[IEEE80211_ADDR_LEN], 1659 const uint8_t bssid[IEEE80211_ADDR_LEN], 1660 const uint8_t *ssid, size_t ssidlen, 1661 const void *optie, size_t optielen) 1662 { 1663 struct ieee80211com *ic = ni->ni_ic; 1664 struct ieee80211_frame *wh; 1665 const struct ieee80211_rateset *rs; 1666 struct mbuf *m; 1667 uint8_t *frm; 1668 1669 /* 1670 * Hold a reference on the node so it doesn't go away until after 1671 * the xmit is complete all the way in the driver. On error we 1672 * will remove our reference. 1673 */ 1674 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1675 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1676 __func__, __LINE__, 1677 ni, ether_sprintf(ni->ni_macaddr), 1678 ieee80211_node_refcnt(ni)+1); 1679 ieee80211_ref_node(ni); 1680 1681 /* 1682 * prreq frame format 1683 * [tlv] ssid 1684 * [tlv] supported rates 1685 * [tlv] extended supported rates 1686 * [tlv] user-specified ie's 1687 */ 1688 m = ieee80211_getmgtframe(&frm, 1689 ic->ic_headroom + sizeof(struct ieee80211_frame), 1690 2 + IEEE80211_NWID_LEN 1691 + 2 + IEEE80211_RATE_SIZE 1692 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1693 + (optie != NULL ? optielen : 0) 1694 ); 1695 if (m == NULL) { 1696 ic->ic_stats.is_tx_nobuf++; 1697 ieee80211_free_node(ni); 1698 return ENOMEM; 1699 } 1700 1701 frm = ieee80211_add_ssid(frm, ssid, ssidlen); 1702 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1703 frm = ieee80211_add_rates(frm, rs); 1704 frm = ieee80211_add_xrates(frm, rs); 1705 1706 if (optie != NULL) { 1707 memcpy(frm, optie, optielen); 1708 frm += optielen; 1709 } 1710 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1711 1712 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 1713 if (m == NULL) 1714 return ENOMEM; 1715 IASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null")); 1716 m->m_pkthdr.rcvif = (void *)ni; 1717 1718 wh = mtod(m, struct ieee80211_frame *); 1719 ieee80211_send_setup(ic, ni, wh, 1720 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ, 1721 sa, da, bssid); 1722 /* XXX power management? */ 1723 1724 IEEE80211_NODE_STAT(ni, tx_probereq); 1725 IEEE80211_NODE_STAT(ni, tx_mgmt); 1726 1727 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, 1728 "[%s] send probe req on channel %u\n", 1729 ether_sprintf(wh->i_addr1), 1730 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1731 1732 IF_ENQUEUE(&ic->ic_mgtq, m); 1733 (*ic->ic_ifp->if_start)(ic->ic_ifp); 1734 return 0; 1735 } 1736 1737 /* 1738 * Calculate capability information for mgt frames. 1739 */ 1740 static uint16_t 1741 getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan) 1742 { 1743 uint16_t capinfo; 1744 1745 IASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode")); 1746 1747 if (ic->ic_opmode == IEEE80211_M_HOSTAP) 1748 capinfo = IEEE80211_CAPINFO_ESS; 1749 else if (ic->ic_opmode == IEEE80211_M_IBSS) 1750 capinfo = IEEE80211_CAPINFO_IBSS; 1751 else 1752 capinfo = 0; 1753 if (ic->ic_flags & IEEE80211_F_PRIVACY) 1754 capinfo |= IEEE80211_CAPINFO_PRIVACY; 1755 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 1756 IEEE80211_IS_CHAN_2GHZ(chan)) 1757 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 1758 if (ic->ic_flags & IEEE80211_F_SHSLOT) 1759 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 1760 return capinfo; 1761 } 1762 1763 /* 1764 * Send a management frame. The node is for the destination (or ic_bss 1765 * when in station mode). Nodes other than ic_bss have their reference 1766 * count bumped to reflect our use for an indeterminant time. 1767 */ 1768 int 1769 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni, 1770 int type, int arg) 1771 { 1772 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT) 1773 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0) 1774 const struct ieee80211_rateset *rs; 1775 struct mbuf *m; 1776 uint8_t *frm; 1777 uint16_t capinfo; 1778 int has_challenge, is_shared_key, ret, status; 1779 1780 IASSERT(ni != NULL, ("null node")); 1781 1782 /* 1783 * Hold a reference on the node so it doesn't go away until after 1784 * the xmit is complete all the way in the driver. On error we 1785 * will remove our reference. 1786 */ 1787 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE, 1788 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n", 1789 __func__, __LINE__, 1790 ni, ether_sprintf(ni->ni_macaddr), 1791 ieee80211_node_refcnt(ni)+1); 1792 ieee80211_ref_node(ni); 1793 1794 switch (type) { 1795 case IEEE80211_FC0_SUBTYPE_PROBE_RESP: 1796 /* 1797 * probe response frame format 1798 * [8] time stamp 1799 * [2] beacon interval 1800 * [2] cabability information 1801 * [tlv] ssid 1802 * [tlv] supported rates 1803 * [tlv] parameter set (FH/DS) 1804 * [tlv] parameter set (IBSS) 1805 * [tlv] extended rate phy (ERP) 1806 * [tlv] extended supported rates 1807 * [tlv] WPA 1808 * [tlv] WME (optional) 1809 * [tlv] HT capabilities 1810 * [tlv] HT information 1811 * [tlv] Vendor OUI HT capabilities (optional) 1812 * [tlv] Vendor OUI HT information (optional) 1813 * [tlv] Atheros capabilities 1814 */ 1815 m = ieee80211_getmgtframe(&frm, 1816 ic->ic_headroom + sizeof(struct ieee80211_frame), 1817 8 1818 + sizeof(uint16_t) 1819 + sizeof(uint16_t) 1820 + 2 + IEEE80211_NWID_LEN 1821 + 2 + IEEE80211_RATE_SIZE 1822 + 7 /* max(7,3) */ 1823 + 6 1824 + 3 1825 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 1826 /* XXX !WPA1+WPA2 fits w/o a cluster */ 1827 + (ic->ic_flags & IEEE80211_F_WPA ? 1828 2*sizeof(struct ieee80211_ie_wpa) : 0) 1829 + sizeof(struct ieee80211_wme_param) 1830 /* XXX check for cluster requirement */ 1831 + 2*sizeof(struct ieee80211_ie_htcap) + 4 1832 + 2*sizeof(struct ieee80211_ie_htinfo) + 4 1833 + sizeof(struct ieee80211_ath_ie) 1834 ); 1835 if (m == NULL) 1836 senderr(ENOMEM, is_tx_nobuf); 1837 1838 memset(frm, 0, 8); /* timestamp should be filled later */ 1839 frm += 8; 1840 *(uint16_t *)frm = htole16(ic->ic_bss->ni_intval); 1841 frm += 2; 1842 capinfo = getcapinfo(ic, ic->ic_curchan); 1843 *(uint16_t *)frm = htole16(capinfo); 1844 frm += 2; 1845 1846 frm = ieee80211_add_ssid(frm, ic->ic_bss->ni_essid, 1847 ic->ic_bss->ni_esslen); 1848 rs = ieee80211_get_suprates(ic, ic->ic_curchan); 1849 frm = ieee80211_add_rates(frm, rs); 1850 1851 if (IEEE80211_IS_CHAN_FHSS(ic->ic_curchan)) { 1852 *frm++ = IEEE80211_ELEMID_FHPARMS; 1853 *frm++ = 5; 1854 *frm++ = ni->ni_fhdwell & 0x00ff; 1855 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff; 1856 *frm++ = IEEE80211_FH_CHANSET( 1857 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1858 *frm++ = IEEE80211_FH_CHANPAT( 1859 ieee80211_chan2ieee(ic, ic->ic_curchan)); 1860 *frm++ = ni->ni_fhindex; 1861 } else { 1862 *frm++ = IEEE80211_ELEMID_DSPARMS; 1863 *frm++ = 1; 1864 *frm++ = ieee80211_chan2ieee(ic, ic->ic_curchan); 1865 } 1866 1867 if (ic->ic_opmode == IEEE80211_M_IBSS) { 1868 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 1869 *frm++ = 2; 1870 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 1871 } 1872 if (ic->ic_flags & IEEE80211_F_WPA) 1873 frm = ieee80211_add_wpa(frm, ic); 1874 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan)) 1875 frm = ieee80211_add_erp(frm, ic); 1876 frm = ieee80211_add_xrates(frm, rs); 1877 /* 1878 * NB: legacy 11b clients do not get certain ie's. 1879 * The caller identifies such clients by passing 1880 * a token in arg to us. Could expand this to be 1881 * any legacy client for stuff like HT ie's. 1882 */ 1883 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && 1884 arg != IEEE80211_SEND_LEGACY_11B) { 1885 frm = ieee80211_add_htcap(frm, ni); 1886 frm = ieee80211_add_htinfo(frm, ni); 1887 } 1888 if (ic->ic_flags & IEEE80211_F_WME) 1889 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 1890 if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && 1891 (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) && 1892 arg != IEEE80211_SEND_LEGACY_11B) { 1893 frm = ieee80211_add_htcap_vendor(frm, ni); 1894 frm = ieee80211_add_htinfo_vendor(frm, ni); 1895 } 1896 if (ni->ni_ath_ie != NULL) 1897 frm = ieee80211_add_ath(frm, ni->ni_ath_flags, 1898 ni->ni_ath_defkeyix); 1899 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 1900 break; 1901 1902 case IEEE80211_FC0_SUBTYPE_AUTH: 1903 status = arg >> 16; 1904 arg &= 0xffff; 1905 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE || 1906 arg == IEEE80211_AUTH_SHARED_RESPONSE) && 1907 ni->ni_challenge != NULL); 1908 1909 /* 1910 * Deduce whether we're doing open authentication or 1911 * shared key authentication. We do the latter if 1912 * we're in the middle of a shared key authentication 1913 * handshake or if we're initiating an authentication 1914 * request and configured to use shared key. 1915 */ 1916 is_shared_key = has_challenge || 1917 arg >= IEEE80211_AUTH_SHARED_RESPONSE || 1918 (arg == IEEE80211_AUTH_SHARED_REQUEST && 1919 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED); 1920 1921 m = ieee80211_getmgtframe(&frm, 1922 ic->ic_headroom + sizeof(struct ieee80211_frame), 1923 3 * sizeof(uint16_t) 1924 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ? 1925 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0) 1926 ); 1927 if (m == NULL) 1928 senderr(ENOMEM, is_tx_nobuf); 1929 1930 ((uint16_t *)frm)[0] = 1931 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED) 1932 : htole16(IEEE80211_AUTH_ALG_OPEN); 1933 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */ 1934 ((uint16_t *)frm)[2] = htole16(status);/* status */ 1935 1936 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) { 1937 ((uint16_t *)frm)[3] = 1938 htole16((IEEE80211_CHALLENGE_LEN << 8) | 1939 IEEE80211_ELEMID_CHALLENGE); 1940 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge, 1941 IEEE80211_CHALLENGE_LEN); 1942 m->m_pkthdr.len = m->m_len = 1943 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN; 1944 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) { 1945 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1946 "[%s] request encrypt frame (%s)\n", 1947 ether_sprintf(ni->ni_macaddr), __func__); 1948 m->m_flags |= M_LINK0; /* WEP-encrypt, please */ 1949 } 1950 } else 1951 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t); 1952 1953 /* XXX not right for shared key */ 1954 if (status == IEEE80211_STATUS_SUCCESS) 1955 IEEE80211_NODE_STAT(ni, tx_auth); 1956 else 1957 IEEE80211_NODE_STAT(ni, tx_auth_fail); 1958 1959 if (ic->ic_opmode == IEEE80211_M_STA) 1960 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 1961 (void *) ic->ic_state); 1962 break; 1963 1964 case IEEE80211_FC0_SUBTYPE_DEAUTH: 1965 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, 1966 "[%s] send station deauthenticate (reason %d)\n", 1967 ether_sprintf(ni->ni_macaddr), arg); 1968 m = ieee80211_getmgtframe(&frm, 1969 ic->ic_headroom + sizeof(struct ieee80211_frame), 1970 sizeof(uint16_t)); 1971 if (m == NULL) 1972 senderr(ENOMEM, is_tx_nobuf); 1973 *(uint16_t *)frm = htole16(arg); /* reason */ 1974 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 1975 1976 IEEE80211_NODE_STAT(ni, tx_deauth); 1977 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg); 1978 1979 ieee80211_node_unauthorize(ni); /* port closed */ 1980 break; 1981 1982 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: 1983 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: 1984 /* 1985 * asreq frame format 1986 * [2] capability information 1987 * [2] listen interval 1988 * [6*] current AP address (reassoc only) 1989 * [tlv] ssid 1990 * [tlv] supported rates 1991 * [tlv] extended supported rates 1992 * [tlv] WME 1993 * [tlv] HT capabilities 1994 * [tlv] Vendor OUI HT capabilities (optional) 1995 * [tlv] Atheros capabilities (if negotiated) 1996 * [tlv] user-specified ie's 1997 */ 1998 m = ieee80211_getmgtframe(&frm, 1999 ic->ic_headroom + sizeof(struct ieee80211_frame), 2000 sizeof(uint16_t) 2001 + sizeof(uint16_t) 2002 + IEEE80211_ADDR_LEN 2003 + 2 + IEEE80211_NWID_LEN 2004 + 2 + IEEE80211_RATE_SIZE 2005 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2006 + sizeof(struct ieee80211_wme_info) 2007 + 2*sizeof(struct ieee80211_ie_htcap) + 4 2008 + sizeof(struct ieee80211_ath_ie) 2009 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0) 2010 ); 2011 if (m == NULL) 2012 senderr(ENOMEM, is_tx_nobuf); 2013 2014 IASSERT(ic->ic_opmode == IEEE80211_M_STA, 2015 ("wrong mode %u", ic->ic_opmode)); 2016 capinfo = IEEE80211_CAPINFO_ESS; 2017 if (ic->ic_flags & IEEE80211_F_PRIVACY) 2018 capinfo |= IEEE80211_CAPINFO_PRIVACY; 2019 /* 2020 * NB: Some 11a AP's reject the request when 2021 * short premable is set. 2022 */ 2023 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) && 2024 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) 2025 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE; 2026 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && 2027 (ic->ic_caps & IEEE80211_C_SHSLOT)) 2028 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME; 2029 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) && 2030 (ic->ic_flags & IEEE80211_F_DOTH)) 2031 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT; 2032 *(uint16_t *)frm = htole16(capinfo); 2033 frm += 2; 2034 2035 IASSERT(ic->ic_bss->ni_intval != 0, 2036 ("beacon interval is zero!")); 2037 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval, 2038 ic->ic_bss->ni_intval)); 2039 frm += 2; 2040 2041 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { 2042 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid); 2043 frm += IEEE80211_ADDR_LEN; 2044 } 2045 2046 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen); 2047 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2048 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2049 if ((ic->ic_flags_ext & IEEE80211_FEXT_HT) && 2050 ni->ni_htcap_ie != NULL && 2051 ni->ni_htcap_ie[0] == IEEE80211_ELEMID_HTCAP) 2052 frm = ieee80211_add_htcap(frm, ni); 2053 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 2054 frm = ieee80211_add_wme_info(frm, &ic->ic_wme); 2055 if ((ic->ic_flags_ext & IEEE80211_FEXT_HT) && 2056 ni->ni_htcap_ie != NULL && 2057 ni->ni_htcap_ie[0] == IEEE80211_ELEMID_VENDOR) 2058 frm = ieee80211_add_htcap_vendor(frm, ni); 2059 if (IEEE80211_ATH_CAP(ic, ni, IEEE80211_F_ATHEROS)) 2060 frm = ieee80211_add_ath(frm, 2061 IEEE80211_ATH_CAP(ic, ni, IEEE80211_F_ATHEROS), 2062 (ic->ic_flags & IEEE80211_F_WPA) == 0 && 2063 ni->ni_authmode != IEEE80211_AUTH_8021X && 2064 ic->ic_def_txkey != IEEE80211_KEYIX_NONE ? 2065 ic->ic_def_txkey : 0x7fff); 2066 if (ic->ic_opt_ie != NULL) { 2067 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len); 2068 frm += ic->ic_opt_ie_len; 2069 } 2070 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2071 2072 ieee80211_add_callback(m, ieee80211_tx_mgt_cb, 2073 (void *) ic->ic_state); 2074 break; 2075 2076 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: 2077 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: 2078 /* 2079 * asresp frame format 2080 * [2] capability information 2081 * [2] status 2082 * [2] association ID 2083 * [tlv] supported rates 2084 * [tlv] extended supported rates 2085 * [tlv] WME (if enabled and STA enabled) 2086 * [tlv] HT capabilities (standard or vendor OUI) 2087 * [tlv] HT information (standard or vendor OUI) 2088 * [tlv] Atheros capabilities (if enabled and STA enabled) 2089 */ 2090 m = ieee80211_getmgtframe(&frm, 2091 ic->ic_headroom + sizeof(struct ieee80211_frame), 2092 sizeof(uint16_t) 2093 + sizeof(uint16_t) 2094 + sizeof(uint16_t) 2095 + 2 + IEEE80211_RATE_SIZE 2096 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2097 + sizeof(struct ieee80211_wme_param) 2098 + sizeof(struct ieee80211_ie_htcap) + 4 2099 + sizeof(struct ieee80211_ie_htinfo) + 4 2100 + sizeof(struct ieee80211_ath_ie) 2101 ); 2102 if (m == NULL) 2103 senderr(ENOMEM, is_tx_nobuf); 2104 2105 capinfo = getcapinfo(ic, ic->ic_curchan); 2106 *(uint16_t *)frm = htole16(capinfo); 2107 frm += 2; 2108 2109 *(uint16_t *)frm = htole16(arg); /* status */ 2110 frm += 2; 2111 2112 if (arg == IEEE80211_STATUS_SUCCESS) { 2113 *(uint16_t *)frm = htole16(ni->ni_associd); 2114 IEEE80211_NODE_STAT(ni, tx_assoc); 2115 } else 2116 IEEE80211_NODE_STAT(ni, tx_assoc_fail); 2117 frm += 2; 2118 2119 frm = ieee80211_add_rates(frm, &ni->ni_rates); 2120 frm = ieee80211_add_xrates(frm, &ni->ni_rates); 2121 /* NB: respond according to what we received */ 2122 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) { 2123 frm = ieee80211_add_htcap(frm, ni); 2124 frm = ieee80211_add_htinfo(frm, ni); 2125 } 2126 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL) 2127 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2128 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) { 2129 frm = ieee80211_add_htcap_vendor(frm, ni); 2130 frm = ieee80211_add_htinfo_vendor(frm, ni); 2131 } 2132 if (IEEE80211_ATH_CAP(ic, ni, IEEE80211_F_ATHEROS)) 2133 frm = ieee80211_add_ath(frm, 2134 IEEE80211_ATH_CAP(ic, ni, IEEE80211_F_ATHEROS), 2135 ni->ni_ath_defkeyix); 2136 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2137 break; 2138 2139 case IEEE80211_FC0_SUBTYPE_DISASSOC: 2140 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, 2141 "[%s] send station disassociate (reason %d)\n", 2142 ether_sprintf(ni->ni_macaddr), arg); 2143 m = ieee80211_getmgtframe(&frm, 2144 ic->ic_headroom + sizeof(struct ieee80211_frame), 2145 sizeof(uint16_t)); 2146 if (m == NULL) 2147 senderr(ENOMEM, is_tx_nobuf); 2148 *(uint16_t *)frm = htole16(arg); /* reason */ 2149 m->m_pkthdr.len = m->m_len = sizeof(uint16_t); 2150 2151 IEEE80211_NODE_STAT(ni, tx_disassoc); 2152 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg); 2153 break; 2154 2155 default: 2156 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2157 "[%s] invalid mgmt frame type %u\n", 2158 ether_sprintf(ni->ni_macaddr), type); 2159 senderr(EINVAL, is_tx_unknownmgt); 2160 /* NOTREACHED */ 2161 } 2162 2163 ret = ieee80211_mgmt_output(ic, ni, m, type); 2164 if (ret != 0) 2165 goto bad; 2166 return 0; 2167 bad: 2168 ieee80211_free_node(ni); 2169 return ret; 2170 #undef senderr 2171 #undef HTFLAGS 2172 } 2173 2174 static void 2175 ieee80211_tx_mgt_timeout(void *arg) 2176 { 2177 struct ieee80211_node *ni = arg; 2178 struct ieee80211com *ic = ni->ni_ic; 2179 2180 if (ic->ic_state != IEEE80211_S_INIT && 2181 (ic->ic_flags & IEEE80211_F_SCAN) == 0) { 2182 /* 2183 * NB: it's safe to specify a timeout as the reason here; 2184 * it'll only be used in the right state. 2185 */ 2186 ieee80211_new_state(ic, IEEE80211_S_SCAN, 2187 IEEE80211_SCAN_FAIL_TIMEOUT); 2188 } 2189 } 2190 2191 static void 2192 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status) 2193 { 2194 struct ieee80211com *ic = ni->ni_ic; 2195 enum ieee80211_state ostate = (enum ieee80211_state) arg; 2196 2197 /* 2198 * Frame transmit completed; arrange timer callback. If 2199 * transmit was successfuly we wait for response. Otherwise 2200 * we arrange an immediate callback instead of doing the 2201 * callback directly since we don't know what state the driver 2202 * is in (e.g. what locks it is holding). This work should 2203 * not be too time-critical and not happen too often so the 2204 * added overhead is acceptable. 2205 * 2206 * XXX what happens if !acked but response shows up before callback? 2207 */ 2208 if (ic->ic_state == ostate) 2209 callout_reset(&ic->ic_mgtsend, 2210 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0, 2211 ieee80211_tx_mgt_timeout, ni); 2212 } 2213 2214 /* 2215 * Allocate a beacon frame and fillin the appropriate bits. 2216 */ 2217 struct mbuf * 2218 ieee80211_beacon_alloc(struct ieee80211_node *ni, 2219 struct ieee80211_beacon_offsets *bo) 2220 { 2221 struct ieee80211com *ic = ni->ni_ic; 2222 struct ifnet *ifp = ic->ic_ifp; 2223 struct ieee80211_frame *wh; 2224 struct mbuf *m; 2225 int pktlen; 2226 uint8_t *frm; 2227 uint16_t capinfo; 2228 struct ieee80211_rateset *rs; 2229 2230 /* 2231 * beacon frame format 2232 * [8] time stamp 2233 * [2] beacon interval 2234 * [2] cabability information 2235 * [tlv] ssid 2236 * [tlv] supported rates 2237 * [3] parameter set (DS) 2238 * [tlv] parameter set (IBSS/TIM) 2239 * [tlv] country code 2240 * [tlv] extended rate phy (ERP) 2241 * [tlv] extended supported rates 2242 * [tlv] WME parameters 2243 * [tlv] WPA/RSN parameters 2244 * [tlv] HT capabilities 2245 * [tlv] HT information 2246 * [tlv] Vendor OUI HT capabilities (optional) 2247 * [tlv] Vendor OUI HT information (optional) 2248 * XXX Vendor-specific OIDs (e.g. Atheros) 2249 * NB: we allocate the max space required for the TIM bitmap. 2250 */ 2251 rs = &ni->ni_rates; 2252 pktlen = 8 /* time stamp */ 2253 + sizeof(uint16_t) /* beacon interval */ 2254 + sizeof(uint16_t) /* capabilities */ 2255 + 2 + ni->ni_esslen /* ssid */ 2256 + 2 + IEEE80211_RATE_SIZE /* supported rates */ 2257 + 2 + 1 /* DS parameters */ 2258 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */ 2259 + sizeof(struct ieee80211_country_ie) /* country code */ 2260 + 2 + 1 /* ERP */ 2261 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE) 2262 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */ 2263 sizeof(struct ieee80211_wme_param) : 0) 2264 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */ 2265 2*sizeof(struct ieee80211_ie_wpa) : 0) 2266 /* XXX conditional? */ 2267 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */ 2268 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */ 2269 ; 2270 m = ieee80211_getmgtframe(&frm, 2271 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen); 2272 if (m == NULL) { 2273 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, 2274 "%s: cannot get buf; size %u\n", __func__, pktlen); 2275 ic->ic_stats.is_tx_nobuf++; 2276 return NULL; 2277 } 2278 2279 memset(bo, 0, sizeof(*bo)); 2280 2281 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */ 2282 frm += 8; 2283 *(uint16_t *)frm = htole16(ni->ni_intval); 2284 frm += 2; 2285 capinfo = getcapinfo(ic, ni->ni_chan); 2286 bo->bo_caps = (uint16_t *)frm; 2287 *(uint16_t *)frm = htole16(capinfo); 2288 frm += 2; 2289 *frm++ = IEEE80211_ELEMID_SSID; 2290 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) { 2291 *frm++ = ni->ni_esslen; 2292 memcpy(frm, ni->ni_essid, ni->ni_esslen); 2293 frm += ni->ni_esslen; 2294 } else 2295 *frm++ = 0; 2296 frm = ieee80211_add_rates(frm, rs); 2297 if (!IEEE80211_IS_CHAN_FHSS(ic->ic_bsschan)) { 2298 *frm++ = IEEE80211_ELEMID_DSPARMS; 2299 *frm++ = 1; 2300 *frm++ = ieee80211_chan2ieee(ic, ic->ic_bsschan); 2301 } 2302 bo->bo_tim = frm; 2303 if (ic->ic_opmode == IEEE80211_M_IBSS) { 2304 *frm++ = IEEE80211_ELEMID_IBSSPARMS; 2305 *frm++ = 2; 2306 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */ 2307 bo->bo_tim_len = 0; 2308 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) { 2309 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm; 2310 2311 tie->tim_ie = IEEE80211_ELEMID_TIM; 2312 tie->tim_len = 4; /* length */ 2313 tie->tim_count = 0; /* DTIM count */ 2314 tie->tim_period = ic->ic_dtim_period; /* DTIM period */ 2315 tie->tim_bitctl = 0; /* bitmap control */ 2316 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */ 2317 frm += sizeof(struct ieee80211_tim_ie); 2318 bo->bo_tim_len = 1; 2319 } 2320 bo->bo_tim_trailer = frm; 2321 if (ic->ic_flags & IEEE80211_F_DOTH) 2322 frm = ieee80211_add_countryie(frm, ic, 2323 ic->ic_countrycode, ic->ic_location); 2324 if (ic->ic_flags & IEEE80211_F_WPA) 2325 frm = ieee80211_add_wpa(frm, ic); 2326 if (IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan)) { 2327 bo->bo_erp = frm; 2328 frm = ieee80211_add_erp(frm, ic); 2329 } 2330 frm = ieee80211_add_xrates(frm, rs); 2331 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan)) { 2332 frm = ieee80211_add_htcap(frm, ni); 2333 bo->bo_htinfo = frm; 2334 frm = ieee80211_add_htinfo(frm, ni); 2335 } 2336 if (ic->ic_flags & IEEE80211_F_WME) { 2337 bo->bo_wme = frm; 2338 frm = ieee80211_add_wme_param(frm, &ic->ic_wme); 2339 } 2340 if (IEEE80211_IS_CHAN_HT(ic->ic_bsschan) && 2341 (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT)) { 2342 frm = ieee80211_add_htcap_vendor(frm, ni); 2343 frm = ieee80211_add_htinfo_vendor(frm, ni); 2344 } 2345 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer; 2346 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *); 2347 2348 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT); 2349 IASSERT(m != NULL, ("no space for 802.11 header?")); 2350 wh = mtod(m, struct ieee80211_frame *); 2351 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | 2352 IEEE80211_FC0_SUBTYPE_BEACON; 2353 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS; 2354 *(uint16_t *)wh->i_dur = 0; 2355 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr); 2356 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr); 2357 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid); 2358 *(uint16_t *)wh->i_seq = 0; 2359 2360 return m; 2361 } 2362 2363 /* 2364 * Update the dynamic parts of a beacon frame based on the current state. 2365 */ 2366 int 2367 ieee80211_beacon_update(struct ieee80211_node *ni, 2368 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast) 2369 { 2370 struct ieee80211com *ic = ni->ni_ic; 2371 int len_changed = 0; 2372 uint16_t capinfo; 2373 2374 IEEE80211_BEACON_LOCK(ic); 2375 /* XXX faster to recalculate entirely or just changes? */ 2376 capinfo = getcapinfo(ic, ni->ni_chan); 2377 *bo->bo_caps = htole16(capinfo); 2378 2379 if (ic->ic_flags & IEEE80211_F_WME) { 2380 struct ieee80211_wme_state *wme = &ic->ic_wme; 2381 2382 /* 2383 * Check for agressive mode change. When there is 2384 * significant high priority traffic in the BSS 2385 * throttle back BE traffic by using conservative 2386 * parameters. Otherwise BE uses agressive params 2387 * to optimize performance of legacy/non-QoS traffic. 2388 */ 2389 if (wme->wme_flags & WME_F_AGGRMODE) { 2390 if (wme->wme_hipri_traffic > 2391 wme->wme_hipri_switch_thresh) { 2392 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 2393 "%s: traffic %u, disable aggressive mode\n", 2394 __func__, wme->wme_hipri_traffic); 2395 wme->wme_flags &= ~WME_F_AGGRMODE; 2396 ieee80211_wme_updateparams_locked(ic); 2397 wme->wme_hipri_traffic = 2398 wme->wme_hipri_switch_hysteresis; 2399 } else 2400 wme->wme_hipri_traffic = 0; 2401 } else { 2402 if (wme->wme_hipri_traffic <= 2403 wme->wme_hipri_switch_thresh) { 2404 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME, 2405 "%s: traffic %u, enable aggressive mode\n", 2406 __func__, wme->wme_hipri_traffic); 2407 wme->wme_flags |= WME_F_AGGRMODE; 2408 ieee80211_wme_updateparams_locked(ic); 2409 wme->wme_hipri_traffic = 0; 2410 } else 2411 wme->wme_hipri_traffic = 2412 wme->wme_hipri_switch_hysteresis; 2413 } 2414 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) { 2415 (void) ieee80211_add_wme_param(bo->bo_wme, wme); 2416 clrbit(bo->bo_flags, IEEE80211_BEACON_WME); 2417 } 2418 } 2419 2420 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) { 2421 ieee80211_ht_update_beacon(ic, bo); 2422 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO); 2423 } 2424 2425 #ifndef IEEE80211_NO_HOSTAP 2426 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/ 2427 struct ieee80211_tim_ie *tie = 2428 (struct ieee80211_tim_ie *) bo->bo_tim; 2429 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) { 2430 u_int timlen, timoff, i; 2431 /* 2432 * ATIM/DTIM needs updating. If it fits in the 2433 * current space allocated then just copy in the 2434 * new bits. Otherwise we need to move any trailing 2435 * data to make room. Note that we know there is 2436 * contiguous space because ieee80211_beacon_allocate 2437 * insures there is space in the mbuf to write a 2438 * maximal-size virtual bitmap (based on ic_max_aid). 2439 */ 2440 /* 2441 * Calculate the bitmap size and offset, copy any 2442 * trailer out of the way, and then copy in the 2443 * new bitmap and update the information element. 2444 * Note that the tim bitmap must contain at least 2445 * one byte and any offset must be even. 2446 */ 2447 if (ic->ic_ps_pending != 0) { 2448 timoff = 128; /* impossibly large */ 2449 for (i = 0; i < ic->ic_tim_len; i++) 2450 if (ic->ic_tim_bitmap[i]) { 2451 timoff = i &~ 1; 2452 break; 2453 } 2454 IASSERT(timoff != 128, ("tim bitmap empty!")); 2455 for (i = ic->ic_tim_len-1; i >= timoff; i--) 2456 if (ic->ic_tim_bitmap[i]) 2457 break; 2458 timlen = 1 + (i - timoff); 2459 } else { 2460 timoff = 0; 2461 timlen = 1; 2462 } 2463 if (timlen != bo->bo_tim_len) { 2464 /* copy up/down trailer */ 2465 int adjust = tie->tim_bitmap+timlen 2466 - bo->bo_tim_trailer; 2467 ovbcopy(bo->bo_tim_trailer, 2468 bo->bo_tim_trailer+adjust, 2469 bo->bo_tim_trailer_len); 2470 bo->bo_tim_trailer += adjust; 2471 bo->bo_wme += adjust; 2472 bo->bo_erp += adjust; 2473 bo->bo_htinfo += adjust; 2474 bo->bo_tim_len = timlen; 2475 2476 /* update information element */ 2477 tie->tim_len = 3 + timlen; 2478 tie->tim_bitctl = timoff; 2479 len_changed = 1; 2480 } 2481 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff, 2482 bo->bo_tim_len); 2483 2484 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM); 2485 2486 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, 2487 "%s: TIM updated, pending %u, off %u, len %u\n", 2488 __func__, ic->ic_ps_pending, timoff, timlen); 2489 } 2490 /* count down DTIM period */ 2491 if (tie->tim_count == 0) 2492 tie->tim_count = tie->tim_period - 1; 2493 else 2494 tie->tim_count--; 2495 /* update state for buffered multicast frames on DTIM */ 2496 if (mcast && tie->tim_count == 0) 2497 tie->tim_bitctl |= 1; 2498 else 2499 tie->tim_bitctl &= ~1; 2500 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) { 2501 /* 2502 * ERP element needs updating. 2503 */ 2504 (void) ieee80211_add_erp(bo->bo_erp, ic); 2505 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP); 2506 } 2507 } 2508 #endif /* !IEEE80211_NO_HOSTAP */ 2509 IEEE80211_BEACON_UNLOCK(ic); 2510 2511 return len_changed; 2512 } 2513
Indexes created Fri Sep 26 08:10:20 GMT 2025