ieee80211_superg.c revision 191753
1/*- 2 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: head/sys/net80211/ieee80211_superg.c 191753 2009-05-02 20:16:55Z sam $"); 28 29#include "opt_wlan.h" 30 31#include <sys/param.h> 32#include <sys/systm.h> 33#include <sys/mbuf.h> 34#include <sys/kernel.h> 35#include <sys/endian.h> 36 37#include <sys/socket.h> 38 39#include <net/bpf.h> 40#include <net/ethernet.h> 41#include <net/if.h> 42#include <net/if_llc.h> 43#include <net/if_media.h> 44 45#include <net80211/ieee80211_var.h> 46#include <net80211/ieee80211_input.h> 47#include <net80211/ieee80211_phy.h> 48#include <net80211/ieee80211_superg.h> 49 50/* 51 * Atheros fast-frame encapsulation format. 52 * FF max payload: 53 * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500: 54 * 8 + 4 + 4 + 14 + 8 + 1500 + 6 + 14 + 8 + 1500 55 * = 3066 56 */ 57/* fast frame header is 32-bits */ 58#define ATH_FF_PROTO 0x0000003f /* protocol */ 59#define ATH_FF_PROTO_S 0 60#define ATH_FF_FTYPE 0x000000c0 /* frame type */ 61#define ATH_FF_FTYPE_S 6 62#define ATH_FF_HLEN32 0x00000300 /* optional hdr length */ 63#define ATH_FF_HLEN32_S 8 64#define ATH_FF_SEQNUM 0x001ffc00 /* sequence number */ 65#define ATH_FF_SEQNUM_S 10 66#define ATH_FF_OFFSET 0xffe00000 /* offset to 2nd payload */ 67#define ATH_FF_OFFSET_S 21 68 69#define ATH_FF_MAX_HDR_PAD 4 70#define ATH_FF_MAX_SEP_PAD 6 71#define ATH_FF_MAX_HDR 30 72 73#define ATH_FF_PROTO_L2TUNNEL 0 /* L2 tunnel protocol */ 74#define ATH_FF_ETH_TYPE 0x88bd /* Ether type for encapsulated frames */ 75#define ATH_FF_SNAP_ORGCODE_0 0x00 76#define ATH_FF_SNAP_ORGCODE_1 0x03 77#define ATH_FF_SNAP_ORGCODE_2 0x7f 78 79#define ATH_FF_TXQMIN 2 /* min txq depth for staging */ 80#define ATH_FF_TXQMAX 50 /* maximum # of queued frames allowed */ 81#define ATH_FF_STAGEMAX 5 /* max waiting period for staged frame*/ 82 83#define ETHER_HEADER_COPY(dst, src) \ 84 memcpy(dst, src, sizeof(struct ether_header)) 85 86/* XXX public for sysctl hookup */ 87int ieee80211_ffppsmin = 2; /* pps threshold for ff aggregation */ 88int ieee80211_ffagemax = -1; /* max time frames held on stage q */ 89 90void 91ieee80211_superg_attach(struct ieee80211com *ic) 92{ 93 struct ieee80211_superg *sg; 94 95 if (ic->ic_caps & IEEE80211_C_FF) { 96 sg = (struct ieee80211_superg *) malloc( 97 sizeof(struct ieee80211_superg), M_80211_VAP, 98 M_NOWAIT | M_ZERO); 99 if (sg == NULL) { 100 printf("%s: cannot allocate SuperG state block\n", 101 __func__); 102 return; 103 } 104 ic->ic_superg = sg; 105 } 106 ieee80211_ffagemax = msecs_to_ticks(150); 107} 108 109void 110ieee80211_superg_detach(struct ieee80211com *ic) 111{ 112 if (ic->ic_superg != NULL) { 113 free(ic->ic_superg, M_80211_VAP); 114 ic->ic_superg = NULL; 115 } 116} 117 118void 119ieee80211_superg_vattach(struct ieee80211vap *vap) 120{ 121 struct ieee80211com *ic = vap->iv_ic; 122 123 if (ic->ic_superg == NULL) /* NB: can't do fast-frames w/o state */ 124 vap->iv_caps &= ~IEEE80211_C_FF; 125 if (vap->iv_caps & IEEE80211_C_FF) 126 vap->iv_flags |= IEEE80211_F_FF; 127 /* NB: we only implement sta mode */ 128 if (vap->iv_opmode == IEEE80211_M_STA && 129 (vap->iv_caps & IEEE80211_C_TURBOP)) 130 vap->iv_flags |= IEEE80211_F_TURBOP; 131} 132 133void 134ieee80211_superg_vdetach(struct ieee80211vap *vap) 135{ 136} 137 138#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 139/* 140 * Add a WME information element to a frame. 141 */ 142uint8_t * 143ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix) 144{ 145 static const struct ieee80211_ath_ie info = { 146 .ath_id = IEEE80211_ELEMID_VENDOR, 147 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 148 .ath_oui = { ATH_OUI_BYTES }, 149 .ath_oui_type = ATH_OUI_TYPE, 150 .ath_oui_subtype= ATH_OUI_SUBTYPE, 151 .ath_version = ATH_OUI_VERSION, 152 }; 153 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 154 155 memcpy(frm, &info, sizeof(info)); 156 ath->ath_capability = caps; 157 if (defkeyix != IEEE80211_KEYIX_NONE) { 158 ath->ath_defkeyix[0] = (defkeyix & 0xff); 159 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 160 } else { 161 ath->ath_defkeyix[0] = 0xff; 162 ath->ath_defkeyix[1] = 0x7f; 163 } 164 return frm + sizeof(info); 165} 166#undef ATH_OUI_BYTES 167 168uint8_t * 169ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss) 170{ 171 const struct ieee80211vap *vap = bss->ni_vap; 172 173 return ieee80211_add_ath(frm, 174 vap->iv_flags & IEEE80211_F_ATHEROS, 175 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 176 bss->ni_authmode != IEEE80211_AUTH_8021X) ? 177 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 178} 179 180void 181ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) 182{ 183 const struct ieee80211_ath_ie *ath = 184 (const struct ieee80211_ath_ie *) ie; 185 186 ni->ni_ath_flags = ath->ath_capability; 187 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 188} 189 190int 191ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 192 const struct ieee80211_frame *wh) 193{ 194 struct ieee80211vap *vap = ni->ni_vap; 195 const struct ieee80211_ath_ie *ath; 196 u_int len = frm[1]; 197 int capschanged; 198 uint16_t defkeyix; 199 200 if (len < sizeof(struct ieee80211_ath_ie)-2) { 201 IEEE80211_DISCARD_IE(vap, 202 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 203 wh, "Atheros", "too short, len %u", len); 204 return -1; 205 } 206 ath = (const struct ieee80211_ath_ie *)frm; 207 capschanged = (ni->ni_ath_flags != ath->ath_capability); 208 defkeyix = LE_READ_2(ath->ath_defkeyix); 209 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 210 ni->ni_ath_flags = ath->ath_capability; 211 ni->ni_ath_defkeyix = defkeyix; 212 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 213 "ath ie change: new caps 0x%x defkeyix 0x%x", 214 ni->ni_ath_flags, ni->ni_ath_defkeyix); 215 } 216 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 217 uint16_t curflags, newflags; 218 219 /* 220 * Check for turbo mode switch. Calculate flags 221 * for the new mode and effect the switch. 222 */ 223 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 224 /* NB: BOOST is not in ic_flags, so get it from the ie */ 225 if (ath->ath_capability & ATHEROS_CAP_BOOST) 226 newflags |= IEEE80211_CHAN_TURBO; 227 else 228 newflags &= ~IEEE80211_CHAN_TURBO; 229 if (newflags != curflags) 230 ieee80211_dturbo_switch(vap, newflags); 231 } 232 return capschanged; 233} 234 235/* 236 * Decap the encapsulated frame pair and dispatch the first 237 * for delivery. The second frame is returned for delivery 238 * via the normal path. 239 */ 240struct mbuf * 241ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m) 242{ 243#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 244#define MS(x,f) (((x) & f) >> f##_S) 245 struct ieee80211vap *vap = ni->ni_vap; 246 struct llc *llc; 247 uint32_t ath; 248 struct mbuf *n; 249 int framelen; 250 251 /* NB: we assume caller does this check for us */ 252 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF), 253 ("ff not negotiated")); 254 /* 255 * Check for fast-frame tunnel encapsulation. 256 */ 257 if (m->m_pkthdr.len < 3*FF_LLC_SIZE) 258 return m; 259 if (m->m_len < FF_LLC_SIZE && 260 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 261 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 262 ni->ni_macaddr, "fast-frame", 263 "%s", "m_pullup(llc) failed"); 264 vap->iv_stats.is_rx_tooshort++; 265 return NULL; 266 } 267 llc = (struct llc *)(mtod(m, uint8_t *) + 268 sizeof(struct ether_header)); 269 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE)) 270 return m; 271 m_adj(m, FF_LLC_SIZE); 272 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 273 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 274 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 275 ni->ni_macaddr, "fast-frame", 276 "unsupport tunnel protocol, header 0x%x", ath); 277 vap->iv_stats.is_ff_badhdr++; 278 m_freem(m); 279 return NULL; 280 } 281 /* NB: skip header and alignment padding */ 282 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 283 284 vap->iv_stats.is_ff_decap++; 285 286 /* 287 * Decap the first frame, bust it apart from the 288 * second and deliver; then decap the second frame 289 * and return it to the caller for normal delivery. 290 */ 291 m = ieee80211_decap1(m, &framelen); 292 if (m == NULL) { 293 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 294 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 295 vap->iv_stats.is_ff_tooshort++; 296 return NULL; 297 } 298 n = m_split(m, framelen, M_NOWAIT); 299 if (n == NULL) { 300 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 301 ni->ni_macaddr, "fast-frame", 302 "%s", "unable to split encapsulated frames"); 303 vap->iv_stats.is_ff_split++; 304 m_freem(m); /* NB: must reclaim */ 305 return NULL; 306 } 307 /* XXX not right for WDS */ 308 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ 309 310 /* 311 * Decap second frame. 312 */ 313 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 314 n = ieee80211_decap1(n, &framelen); 315 if (n == NULL) { 316 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 317 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 318 vap->iv_stats.is_ff_tooshort++; 319 } 320 /* XXX verify framelen against mbuf contents */ 321 return n; /* 2nd delivered by caller */ 322#undef MS 323#undef FF_LLC_SIZE 324} 325 326/* 327 * Do Ethernet-LLC encapsulation for each payload in a fast frame 328 * tunnel encapsulation. The frame is assumed to have an Ethernet 329 * header at the front that must be stripped before prepending the 330 * LLC followed by the Ethernet header passed in (with an Ethernet 331 * type that specifies the payload size). 332 */ 333static struct mbuf * 334ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 335 const struct ether_header *eh) 336{ 337 struct llc *llc; 338 uint16_t payload; 339 340 /* XXX optimize by combining m_adj+M_PREPEND */ 341 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 342 llc = mtod(m, struct llc *); 343 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 344 llc->llc_control = LLC_UI; 345 llc->llc_snap.org_code[0] = 0; 346 llc->llc_snap.org_code[1] = 0; 347 llc->llc_snap.org_code[2] = 0; 348 llc->llc_snap.ether_type = eh->ether_type; 349 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 350 351 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 352 if (m == NULL) { /* XXX cannot happen */ 353 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 354 "%s: no space for ether_header\n", __func__); 355 vap->iv_stats.is_tx_nobuf++; 356 return NULL; 357 } 358 ETHER_HEADER_COPY(mtod(m, void *), eh); 359 mtod(m, struct ether_header *)->ether_type = htons(payload); 360 return m; 361} 362 363/* 364 * Fast frame encapsulation. There must be two packets 365 * chained with m_nextpkt. We do header adjustment for 366 * each, add the tunnel encapsulation, and then concatenate 367 * the mbuf chains to form a single frame for transmission. 368 */ 369struct mbuf * 370ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, 371 struct ieee80211_key *key) 372{ 373 struct mbuf *m2; 374 struct ether_header eh1, eh2; 375 struct llc *llc; 376 struct mbuf *m; 377 int pad; 378 379 m2 = m1->m_nextpkt; 380 if (m2 == NULL) { 381 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 382 "%s: only one frame\n", __func__); 383 goto bad; 384 } 385 m1->m_nextpkt = NULL; 386 /* 387 * Include fast frame headers in adjusting header layout. 388 */ 389 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!")); 390 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t)); 391 m1 = ieee80211_mbuf_adjust(vap, 392 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 393 sizeof(struct ether_header), 394 key, m1); 395 if (m1 == NULL) { 396 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 397 m_freem(m2); 398 goto bad; 399 } 400 401 /* 402 * Copy second frame's Ethernet header out of line 403 * and adjust for encapsulation headers. Note that 404 * we make room for padding in case there isn't room 405 * at the end of first frame. 406 */ 407 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 408 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 409 m2 = ieee80211_mbuf_adjust(vap, 410 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 411 NULL, m2); 412 if (m2 == NULL) { 413 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 414 goto bad; 415 } 416 417 /* 418 * Now do tunnel encapsulation. First, each 419 * frame gets a standard encapsulation. 420 */ 421 m1 = ff_encap1(vap, m1, &eh1); 422 if (m1 == NULL) 423 goto bad; 424 m2 = ff_encap1(vap, m2, &eh2); 425 if (m2 == NULL) 426 goto bad; 427 428 /* 429 * Pad leading frame to a 4-byte boundary. If there 430 * is space at the end of the first frame, put it 431 * there; otherwise prepend to the front of the second 432 * frame. We know doing the second will always work 433 * because we reserve space above. We prefer appending 434 * as this typically has better DMA alignment properties. 435 */ 436 for (m = m1; m->m_next != NULL; m = m->m_next) 437 ; 438 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 439 if (pad) { 440 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 441 m2->m_data -= pad; 442 m2->m_len += pad; 443 m2->m_pkthdr.len += pad; 444 } else { /* append to first */ 445 m->m_len += pad; 446 m1->m_pkthdr.len += pad; 447 } 448 } 449 450 /* 451 * Now, stick 'em together and prepend the tunnel headers; 452 * first the Atheros tunnel header (all zero for now) and 453 * then a special fast frame LLC. 454 * 455 * XXX optimize by prepending together 456 */ 457 m->m_next = m2; /* NB: last mbuf from above */ 458 m1->m_pkthdr.len += m2->m_pkthdr.len; 459 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 460 if (m1 == NULL) { /* XXX cannot happen */ 461 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 462 "%s: no space for tunnel header\n", __func__); 463 vap->iv_stats.is_tx_nobuf++; 464 return NULL; 465 } 466 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 467 468 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 469 if (m1 == NULL) { /* XXX cannot happen */ 470 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 471 "%s: no space for llc header\n", __func__); 472 vap->iv_stats.is_tx_nobuf++; 473 return NULL; 474 } 475 llc = mtod(m1, struct llc *); 476 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 477 llc->llc_control = LLC_UI; 478 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 479 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 480 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 481 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 482 483 vap->iv_stats.is_ff_encap++; 484 485 return m1; 486bad: 487 if (m1 != NULL) 488 m_freem(m1); 489 if (m2 != NULL) 490 m_freem(m2); 491 return NULL; 492} 493 494static void 495ff_transmit(struct ieee80211_node *ni, struct mbuf *m) 496{ 497 struct ieee80211vap *vap = ni->ni_vap; 498 int error; 499 500 /* encap and xmit */ 501 m = ieee80211_encap(vap, ni, m); 502 if (m != NULL) { 503 struct ifnet *ifp = vap->iv_ifp; 504 struct ifnet *parent = ni->ni_ic->ic_ifp; 505 506 if (bpf_peers_present(vap->iv_rawbpf)) 507 bpf_mtap(vap->iv_rawbpf, m); 508 509 error = parent->if_transmit(parent, m); 510 if (error != 0) { 511 /* NB: IFQ_HANDOFF reclaims mbuf */ 512 ieee80211_free_node(ni); 513 } else { 514 ifp->if_opackets++; 515 } 516 } else 517 ieee80211_free_node(ni); 518} 519 520/* 521 * Flush frames to device; note we re-use the linked list 522 * the frames were stored on and use the sentinel (unchanged) 523 * which may be non-NULL. 524 */ 525static void 526ff_flush(struct mbuf *head, struct mbuf *last) 527{ 528 struct mbuf *m, *next; 529 struct ieee80211_node *ni; 530 struct ieee80211vap *vap; 531 532 for (m = head; m != last; m = next) { 533 next = m->m_nextpkt; 534 m->m_nextpkt = NULL; 535 536 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 537 vap = ni->ni_vap; 538 539 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 540 "%s: flush frame, age %u", __func__, M_AGE_GET(m)); 541 vap->iv_stats.is_ff_flush++; 542 543 ff_transmit(ni, m); 544 } 545} 546 547/* 548 * Age frames on the staging queue. 549 */ 550void 551ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq, 552 int quanta) 553{ 554 struct ieee80211_superg *sg = ic->ic_superg; 555 struct mbuf *m, *head; 556 struct ieee80211_node *ni; 557 struct ieee80211_tx_ampdu *tap; 558 559 KASSERT(sq->head != NULL, ("stageq empty")); 560 561 IEEE80211_LOCK(ic); 562 head = sq->head; 563 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) { 564 /* clear tap ref to frame */ 565 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 566 tap = &ni->ni_tx_ampdu[M_WME_GETAC(m)]; 567 KASSERT(tap->txa_private == m, ("staging queue empty")); 568 tap->txa_private = NULL; 569 570 sq->head = m->m_nextpkt; 571 sq->depth--; 572 sg->ff_stageqdepth--; 573 } 574 if (m == NULL) 575 sq->tail = NULL; 576 else 577 M_AGE_SUB(m, quanta); 578 IEEE80211_UNLOCK(ic); 579 580 ff_flush(head, m); 581} 582 583static void 584stageq_add(struct ieee80211_stageq *sq, struct mbuf *m) 585{ 586 int age = ieee80211_ffagemax; 587 if (sq->tail != NULL) { 588 sq->tail->m_nextpkt = m; 589 age -= M_AGE_GET(sq->head); 590 } else 591 sq->head = m; 592 KASSERT(age >= 0, ("age %d", age)); 593 M_AGE_SET(m, age); 594 m->m_nextpkt = NULL; 595 sq->tail = m; 596 sq->depth++; 597} 598 599static void 600stageq_remove(struct ieee80211_stageq *sq, struct mbuf *mstaged) 601{ 602 struct mbuf *m, *mprev; 603 604 mprev = NULL; 605 for (m = sq->head; m != NULL; m = m->m_nextpkt) { 606 if (m == mstaged) { 607 if (mprev == NULL) 608 sq->head = m->m_nextpkt; 609 else 610 mprev->m_nextpkt = m->m_nextpkt; 611 if (sq->tail == m) 612 sq->tail = mprev; 613 sq->depth--; 614 return; 615 } 616 mprev = m; 617 } 618 printf("%s: packet not found\n", __func__); 619} 620 621static uint32_t 622ff_approx_txtime(struct ieee80211_node *ni, 623 const struct mbuf *m1, const struct mbuf *m2) 624{ 625 struct ieee80211com *ic = ni->ni_ic; 626 struct ieee80211vap *vap = ni->ni_vap; 627 uint32_t framelen; 628 629 /* 630 * Approximate the frame length to be transmitted. A swag to add 631 * the following maximal values to the skb payload: 632 * - 32: 802.11 encap + CRC 633 * - 24: encryption overhead (if wep bit) 634 * - 4 + 6: fast-frame header and padding 635 * - 16: 2 LLC FF tunnel headers 636 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd) 637 */ 638 framelen = m1->m_pkthdr.len + 32 + 639 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR; 640 if (vap->iv_flags & IEEE80211_F_PRIVACY) 641 framelen += 24; 642 if (m2 != NULL) 643 framelen += m2->m_pkthdr.len; 644 return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0); 645} 646 647/* 648 * Check if the supplied frame can be partnered with an existing 649 * or pending frame. Return a reference to any frame that should be 650 * sent on return; otherwise return NULL. 651 */ 652struct mbuf * 653ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m) 654{ 655 struct ieee80211vap *vap = ni->ni_vap; 656 struct ieee80211com *ic = ni->ni_ic; 657 struct ieee80211_superg *sg = ic->ic_superg; 658 const int pri = M_WME_GETAC(m); 659 struct ieee80211_stageq *sq; 660 struct ieee80211_tx_ampdu *tap; 661 struct mbuf *mstaged; 662 uint32_t txtime, limit; 663 664 /* 665 * Check if the supplied frame can be aggregated. 666 * 667 * NB: we allow EAPOL frames to be aggregated with other ucast traffic. 668 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't 669 * be aggregated with other types of frames when encryption is on? 670 */ 671 IEEE80211_LOCK(ic); 672 tap = &ni->ni_tx_ampdu[pri]; 673 mstaged = tap->txa_private; /* NB: we reuse AMPDU state */ 674 ieee80211_txampdu_count_packet(tap); 675 676 /* 677 * When not in station mode never aggregate a multicast 678 * frame; this insures, for example, that a combined frame 679 * does not require multiple encryption keys. 680 */ 681 if (vap->iv_opmode != IEEE80211_M_STA && 682 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) { 683 /* XXX flush staged frame? */ 684 IEEE80211_UNLOCK(ic); 685 return m; 686 } 687 /* 688 * If there is no frame to combine with and the pps is 689 * too low; then do not attempt to aggregate this frame. 690 */ 691 if (mstaged == NULL && 692 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) { 693 IEEE80211_UNLOCK(ic); 694 return m; 695 } 696 sq = &sg->ff_stageq[pri]; 697 /* 698 * Check the txop limit to insure the aggregate fits. 699 */ 700 limit = IEEE80211_TXOP_TO_US( 701 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit); 702 if (limit != 0 && 703 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) { 704 /* 705 * Aggregate too long, return to the caller for direct 706 * transmission. In addition, flush any pending frame 707 * before sending this one. 708 */ 709 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 710 "%s: txtime %u exceeds txop limit %u\n", 711 __func__, txtime, limit); 712 713 tap->txa_private = NULL; 714 if (mstaged != NULL) 715 stageq_remove(sq, mstaged); 716 IEEE80211_UNLOCK(ic); 717 718 if (mstaged != NULL) { 719 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 720 "%s: flush staged frame", __func__); 721 /* encap and xmit */ 722 ff_transmit(ni, mstaged); 723 } 724 return m; /* NB: original frame */ 725 } 726 /* 727 * An aggregation candidate. If there's a frame to partner 728 * with then combine and return for processing. Otherwise 729 * save this frame and wait for a partner to show up (or 730 * the frame to be flushed). Note that staged frames also 731 * hold their node reference. 732 */ 733 if (mstaged != NULL) { 734 tap->txa_private = NULL; 735 stageq_remove(sq, mstaged); 736 IEEE80211_UNLOCK(ic); 737 738 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 739 "%s: aggregate fast-frame", __func__); 740 /* 741 * Release the node reference; we only need 742 * the one already in mstaged. 743 */ 744 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni, 745 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni)); 746 ieee80211_free_node(ni); 747 748 m->m_nextpkt = NULL; 749 mstaged->m_nextpkt = m; 750 mstaged->m_flags |= M_FF; /* NB: mark for encap work */ 751 } else { 752 KASSERT(tap->txa_private == NULL, 753 ("txa_private %p", tap->txa_private)); 754 tap->txa_private = m; 755 756 stageq_add(sq, m); 757 sg->ff_stageqdepth++; 758 IEEE80211_UNLOCK(ic); 759 760 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 761 "%s: stage frame, %u queued", __func__, sq->depth); 762 /* NB: mstaged is NULL */ 763 } 764 return mstaged; 765} 766 767void 768ieee80211_ff_node_init(struct ieee80211_node *ni) 769{ 770 /* 771 * Clean FF state on re-associate. This handles the case 772 * where a station leaves w/o notifying us and then returns 773 * before node is reaped for inactivity. 774 */ 775 ieee80211_ff_node_cleanup(ni); 776} 777 778void 779ieee80211_ff_node_cleanup(struct ieee80211_node *ni) 780{ 781 struct ieee80211com *ic = ni->ni_ic; 782 struct ieee80211_superg *sg = ic->ic_superg; 783 struct ieee80211_tx_ampdu *tap; 784 struct mbuf *m, *head; 785 int ac; 786 787 IEEE80211_LOCK(ic); 788 head = NULL; 789 for (ac = 0; ac < WME_NUM_AC; ac++) { 790 tap = &ni->ni_tx_ampdu[ac]; 791 m = tap->txa_private; 792 if (m != NULL) { 793 tap->txa_private = NULL; 794 stageq_remove(&sg->ff_stageq[ac], m); 795 m->m_nextpkt = head; 796 head = m; 797 } 798 } 799 IEEE80211_UNLOCK(ic); 800 801 for (m = head; m != NULL; m = m->m_nextpkt) { 802 m_freem(m); 803 ieee80211_free_node(ni); 804 } 805} 806 807/* 808 * Switch between turbo and non-turbo operating modes. 809 * Use the specified channel flags to locate the new 810 * channel, update 802.11 state, and then call back into 811 * the driver to effect the change. 812 */ 813void 814ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) 815{ 816 struct ieee80211com *ic = vap->iv_ic; 817 struct ieee80211_channel *chan; 818 819 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); 820 if (chan == NULL) { /* XXX should not happen */ 821 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 822 "%s: no channel with freq %u flags 0x%x\n", 823 __func__, ic->ic_bsschan->ic_freq, newflags); 824 return; 825 } 826 827 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 828 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, 829 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], 830 ieee80211_phymode_name[ieee80211_chan2mode(chan)], 831 chan->ic_freq, chan->ic_flags); 832 833 ic->ic_bsschan = chan; 834 ic->ic_prevchan = ic->ic_curchan; 835 ic->ic_curchan = chan; 836 ic->ic_rt = ieee80211_get_ratetable(chan); 837 ic->ic_set_channel(ic); 838 /* NB: do not need to reset ERP state 'cuz we're in sta mode */ 839} 840 841/* 842 * Return the current ``state'' of an Atheros capbility. 843 * If associated in station mode report the negotiated 844 * setting. Otherwise report the current setting. 845 */ 846static int 847getathcap(struct ieee80211vap *vap, int cap) 848{ 849 if (vap->iv_opmode == IEEE80211_M_STA && 850 vap->iv_state == IEEE80211_S_RUN) 851 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; 852 else 853 return (vap->iv_flags & cap) != 0; 854} 855 856static int 857superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 858{ 859 switch (ireq->i_type) { 860 case IEEE80211_IOC_FF: 861 ireq->i_val = getathcap(vap, IEEE80211_F_FF); 862 break; 863 case IEEE80211_IOC_TURBOP: 864 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); 865 break; 866 default: 867 return ENOSYS; 868 } 869 return 0; 870} 871IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); 872 873static int 874superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 875{ 876 switch (ireq->i_type) { 877 case IEEE80211_IOC_FF: 878 if (ireq->i_val) { 879 if ((vap->iv_caps & IEEE80211_C_FF) == 0) 880 return EOPNOTSUPP; 881 vap->iv_flags |= IEEE80211_F_FF; 882 } else 883 vap->iv_flags &= ~IEEE80211_F_FF; 884 return ENETRESET; 885 case IEEE80211_IOC_TURBOP: 886 if (ireq->i_val) { 887 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) 888 return EOPNOTSUPP; 889 vap->iv_flags |= IEEE80211_F_TURBOP; 890 } else 891 vap->iv_flags &= ~IEEE80211_F_TURBOP; 892 return ENETRESET; 893 default: 894 return ENOSYS; 895 } 896 return 0; 897} 898IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); 899