ieee80211_superg.c revision 191550
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 191550 2009-04-26 22:45:21Z 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 ieee80211_ffagemax = msecs_to_ticks(150); 94} 95 96void 97ieee80211_superg_detach(struct ieee80211com *ic) 98{ 99} 100 101void 102ieee80211_superg_vattach(struct ieee80211vap *vap) 103{ 104 if (vap->iv_caps & IEEE80211_C_FF) 105 vap->iv_flags |= IEEE80211_F_FF; 106 /* NB: we only implement sta mode */ 107 if (vap->iv_opmode == IEEE80211_M_STA && 108 (vap->iv_caps & IEEE80211_C_TURBOP)) 109 vap->iv_flags |= IEEE80211_F_TURBOP; 110} 111 112void 113ieee80211_superg_vdetach(struct ieee80211vap *vap) 114{ 115} 116 117#define ATH_OUI_BYTES 0x00, 0x03, 0x7f 118/* 119 * Add a WME information element to a frame. 120 */ 121uint8_t * 122ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix) 123{ 124 static const struct ieee80211_ath_ie info = { 125 .ath_id = IEEE80211_ELEMID_VENDOR, 126 .ath_len = sizeof(struct ieee80211_ath_ie) - 2, 127 .ath_oui = { ATH_OUI_BYTES }, 128 .ath_oui_type = ATH_OUI_TYPE, 129 .ath_oui_subtype= ATH_OUI_SUBTYPE, 130 .ath_version = ATH_OUI_VERSION, 131 }; 132 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm; 133 134 memcpy(frm, &info, sizeof(info)); 135 ath->ath_capability = caps; 136 if (defkeyix != IEEE80211_KEYIX_NONE) { 137 ath->ath_defkeyix[0] = (defkeyix & 0xff); 138 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff); 139 } else { 140 ath->ath_defkeyix[0] = 0xff; 141 ath->ath_defkeyix[1] = 0x7f; 142 } 143 return frm + sizeof(info); 144} 145#undef ATH_OUI_BYTES 146 147uint8_t * 148ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss) 149{ 150 const struct ieee80211vap *vap = bss->ni_vap; 151 152 return ieee80211_add_ath(frm, 153 vap->iv_flags & IEEE80211_F_ATHEROS, 154 ((vap->iv_flags & IEEE80211_F_WPA) == 0 && 155 bss->ni_authmode != IEEE80211_AUTH_8021X) ? 156 vap->iv_def_txkey : IEEE80211_KEYIX_NONE); 157} 158 159void 160ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) 161{ 162 const struct ieee80211_ath_ie *ath = 163 (const struct ieee80211_ath_ie *) ie; 164 165 ni->ni_ath_flags = ath->ath_capability; 166 ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); 167} 168 169int 170ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, 171 const struct ieee80211_frame *wh) 172{ 173 struct ieee80211vap *vap = ni->ni_vap; 174 const struct ieee80211_ath_ie *ath; 175 u_int len = frm[1]; 176 int capschanged; 177 uint16_t defkeyix; 178 179 if (len < sizeof(struct ieee80211_ath_ie)-2) { 180 IEEE80211_DISCARD_IE(vap, 181 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, 182 wh, "Atheros", "too short, len %u", len); 183 return -1; 184 } 185 ath = (const struct ieee80211_ath_ie *)frm; 186 capschanged = (ni->ni_ath_flags != ath->ath_capability); 187 defkeyix = LE_READ_2(ath->ath_defkeyix); 188 if (capschanged || defkeyix != ni->ni_ath_defkeyix) { 189 ni->ni_ath_flags = ath->ath_capability; 190 ni->ni_ath_defkeyix = defkeyix; 191 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 192 "ath ie change: new caps 0x%x defkeyix 0x%x", 193 ni->ni_ath_flags, ni->ni_ath_defkeyix); 194 } 195 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) { 196 uint16_t curflags, newflags; 197 198 /* 199 * Check for turbo mode switch. Calculate flags 200 * for the new mode and effect the switch. 201 */ 202 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags; 203 /* NB: BOOST is not in ic_flags, so get it from the ie */ 204 if (ath->ath_capability & ATHEROS_CAP_BOOST) 205 newflags |= IEEE80211_CHAN_TURBO; 206 else 207 newflags &= ~IEEE80211_CHAN_TURBO; 208 if (newflags != curflags) 209 ieee80211_dturbo_switch(vap, newflags); 210 } 211 return capschanged; 212} 213 214/* 215 * Decap the encapsulated frame pair and dispatch the first 216 * for delivery. The second frame is returned for delivery 217 * via the normal path. 218 */ 219struct mbuf * 220ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m) 221{ 222#define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) 223#define MS(x,f) (((x) & f) >> f##_S) 224 struct ieee80211vap *vap = ni->ni_vap; 225 struct llc *llc; 226 uint32_t ath; 227 struct mbuf *n; 228 int framelen; 229 230 /* NB: we assume caller does this check for us */ 231 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF), 232 ("ff not negotiated")); 233 /* 234 * Check for fast-frame tunnel encapsulation. 235 */ 236 if (m->m_pkthdr.len < 3*FF_LLC_SIZE) 237 return m; 238 if (m->m_len < FF_LLC_SIZE && 239 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { 240 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 241 ni->ni_macaddr, "fast-frame", 242 "%s", "m_pullup(llc) failed"); 243 vap->iv_stats.is_rx_tooshort++; 244 return NULL; 245 } 246 llc = (struct llc *)(mtod(m, uint8_t *) + 247 sizeof(struct ether_header)); 248 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE)) 249 return m; 250 m_adj(m, FF_LLC_SIZE); 251 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); 252 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { 253 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 254 ni->ni_macaddr, "fast-frame", 255 "unsupport tunnel protocol, header 0x%x", ath); 256 vap->iv_stats.is_ff_badhdr++; 257 m_freem(m); 258 return NULL; 259 } 260 /* NB: skip header and alignment padding */ 261 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); 262 263 vap->iv_stats.is_ff_decap++; 264 265 /* 266 * Decap the first frame, bust it apart from the 267 * second and deliver; then decap the second frame 268 * and return it to the caller for normal delivery. 269 */ 270 m = ieee80211_decap1(m, &framelen); 271 if (m == NULL) { 272 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 273 ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); 274 vap->iv_stats.is_ff_tooshort++; 275 return NULL; 276 } 277 n = m_split(m, framelen, M_NOWAIT); 278 if (n == NULL) { 279 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 280 ni->ni_macaddr, "fast-frame", 281 "%s", "unable to split encapsulated frames"); 282 vap->iv_stats.is_ff_split++; 283 m_freem(m); /* NB: must reclaim */ 284 return NULL; 285 } 286 /* XXX not right for WDS */ 287 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */ 288 289 /* 290 * Decap second frame. 291 */ 292 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ 293 n = ieee80211_decap1(n, &framelen); 294 if (n == NULL) { 295 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY, 296 ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); 297 vap->iv_stats.is_ff_tooshort++; 298 } 299 /* XXX verify framelen against mbuf contents */ 300 return n; /* 2nd delivered by caller */ 301#undef MS 302#undef FF_LLC_SIZE 303} 304 305/* 306 * Do Ethernet-LLC encapsulation for each payload in a fast frame 307 * tunnel encapsulation. The frame is assumed to have an Ethernet 308 * header at the front that must be stripped before prepending the 309 * LLC followed by the Ethernet header passed in (with an Ethernet 310 * type that specifies the payload size). 311 */ 312static struct mbuf * 313ff_encap1(struct ieee80211vap *vap, struct mbuf *m, 314 const struct ether_header *eh) 315{ 316 struct llc *llc; 317 uint16_t payload; 318 319 /* XXX optimize by combining m_adj+M_PREPEND */ 320 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc)); 321 llc = mtod(m, struct llc *); 322 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 323 llc->llc_control = LLC_UI; 324 llc->llc_snap.org_code[0] = 0; 325 llc->llc_snap.org_code[1] = 0; 326 llc->llc_snap.org_code[2] = 0; 327 llc->llc_snap.ether_type = eh->ether_type; 328 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */ 329 330 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 331 if (m == NULL) { /* XXX cannot happen */ 332 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 333 "%s: no space for ether_header\n", __func__); 334 vap->iv_stats.is_tx_nobuf++; 335 return NULL; 336 } 337 ETHER_HEADER_COPY(mtod(m, void *), eh); 338 mtod(m, struct ether_header *)->ether_type = htons(payload); 339 return m; 340} 341 342/* 343 * Fast frame encapsulation. There must be two packets 344 * chained with m_nextpkt. We do header adjustment for 345 * each, add the tunnel encapsulation, and then concatenate 346 * the mbuf chains to form a single frame for transmission. 347 */ 348struct mbuf * 349ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace, 350 struct ieee80211_key *key) 351{ 352 struct mbuf *m2; 353 struct ether_header eh1, eh2; 354 struct llc *llc; 355 struct mbuf *m; 356 int pad; 357 358 m2 = m1->m_nextpkt; 359 if (m2 == NULL) { 360 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 361 "%s: only one frame\n", __func__); 362 goto bad; 363 } 364 m1->m_nextpkt = NULL; 365 /* 366 * Include fast frame headers in adjusting header layout. 367 */ 368 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!")); 369 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t)); 370 m1 = ieee80211_mbuf_adjust(vap, 371 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 + 372 sizeof(struct ether_header), 373 key, m1); 374 if (m1 == NULL) { 375 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 376 m_freem(m2); 377 goto bad; 378 } 379 380 /* 381 * Copy second frame's Ethernet header out of line 382 * and adjust for encapsulation headers. Note that 383 * we make room for padding in case there isn't room 384 * at the end of first frame. 385 */ 386 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!")); 387 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t)); 388 m2 = ieee80211_mbuf_adjust(vap, 389 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header), 390 NULL, m2); 391 if (m2 == NULL) { 392 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */ 393 goto bad; 394 } 395 396 /* 397 * Now do tunnel encapsulation. First, each 398 * frame gets a standard encapsulation. 399 */ 400 m1 = ff_encap1(vap, m1, &eh1); 401 if (m1 == NULL) 402 goto bad; 403 m2 = ff_encap1(vap, m2, &eh2); 404 if (m2 == NULL) 405 goto bad; 406 407 /* 408 * Pad leading frame to a 4-byte boundary. If there 409 * is space at the end of the first frame, put it 410 * there; otherwise prepend to the front of the second 411 * frame. We know doing the second will always work 412 * because we reserve space above. We prefer appending 413 * as this typically has better DMA alignment properties. 414 */ 415 for (m = m1; m->m_next != NULL; m = m->m_next) 416 ; 417 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len; 418 if (pad) { 419 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */ 420 m2->m_data -= pad; 421 m2->m_len += pad; 422 m2->m_pkthdr.len += pad; 423 } else { /* append to first */ 424 m->m_len += pad; 425 m1->m_pkthdr.len += pad; 426 } 427 } 428 429 /* 430 * Now, stick 'em together and prepend the tunnel headers; 431 * first the Atheros tunnel header (all zero for now) and 432 * then a special fast frame LLC. 433 * 434 * XXX optimize by prepending together 435 */ 436 m->m_next = m2; /* NB: last mbuf from above */ 437 m1->m_pkthdr.len += m2->m_pkthdr.len; 438 M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT); 439 if (m1 == NULL) { /* XXX cannot happen */ 440 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 441 "%s: no space for tunnel header\n", __func__); 442 vap->iv_stats.is_tx_nobuf++; 443 return NULL; 444 } 445 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2); 446 447 M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT); 448 if (m1 == NULL) { /* XXX cannot happen */ 449 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 450 "%s: no space for llc header\n", __func__); 451 vap->iv_stats.is_tx_nobuf++; 452 return NULL; 453 } 454 llc = mtod(m1, struct llc *); 455 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP; 456 llc->llc_control = LLC_UI; 457 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0; 458 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1; 459 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2; 460 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE); 461 462 vap->iv_stats.is_ff_encap++; 463 464 return m1; 465bad: 466 if (m1 != NULL) 467 m_freem(m1); 468 if (m2 != NULL) 469 m_freem(m2); 470 return NULL; 471} 472 473static void 474ff_transmit(struct ieee80211_node *ni, struct mbuf *m) 475{ 476 struct ieee80211vap *vap = ni->ni_vap; 477 int error; 478 479 /* encap and xmit */ 480 m = ieee80211_encap(vap, ni, m); 481 if (m != NULL) { 482 struct ifnet *ifp = vap->iv_ifp; 483 struct ifnet *parent = ni->ni_ic->ic_ifp; 484 485 if (bpf_peers_present(vap->iv_rawbpf)) 486 bpf_mtap(vap->iv_rawbpf, m); 487 488 error = parent->if_transmit(parent, m); 489 if (error != 0) { 490 /* NB: IFQ_HANDOFF reclaims mbuf */ 491 ieee80211_free_node(ni); 492 } else { 493 ifp->if_opackets++; 494 } 495 } else 496 ieee80211_free_node(ni); 497} 498 499/* 500 * Flush frames to device; note we re-use the linked list 501 * the frames were stored on and use the sentinel (unchanged) 502 * which may be non-NULL. 503 */ 504static void 505ff_flush(struct mbuf *head, struct mbuf *last) 506{ 507 struct mbuf *m, *next; 508 struct ieee80211_node *ni; 509 struct ieee80211vap *vap; 510 511 for (m = head; m != last; m = next) { 512 next = m->m_nextpkt; 513 m->m_nextpkt = NULL; 514 515 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 516 vap = ni->ni_vap; 517 518 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 519 "%s: flush frame, age %u", __func__, M_AGE_GET(m)); 520 vap->iv_stats.is_ff_flush++; 521 522 ff_transmit(ni, m); 523 } 524} 525 526/* 527 * Age frames on the staging queue. 528 */ 529void 530ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq, int quanta) 531{ 532 struct mbuf *m, *head; 533 struct ieee80211_node *ni; 534 struct ieee80211_tx_ampdu *tap; 535 536 KASSERT(sq->head != NULL, ("stageq empty")); 537 538 IEEE80211_LOCK(ic); 539 head = sq->head; 540 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) { 541 /* clear tap ref to frame */ 542 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif; 543 tap = &ni->ni_tx_ampdu[M_WME_GETAC(m)]; 544 KASSERT(tap->txa_private == m, ("staging queue empty")); 545 tap->txa_private = NULL; 546 547 sq->head = m->m_nextpkt; 548 sq->depth--; 549 ic->ic_stageqdepth--; 550 } 551 if (m == NULL) 552 sq->tail = NULL; 553 else 554 M_AGE_SUB(m, quanta); 555 IEEE80211_UNLOCK(ic); 556 557 ff_flush(head, m); 558} 559 560static void 561stageq_add(struct ieee80211_stageq *sq, struct mbuf *m) 562{ 563 int age = ieee80211_ffagemax; 564 if (sq->tail != NULL) { 565 sq->tail->m_nextpkt = m; 566 age -= M_AGE_GET(sq->head); 567 } else 568 sq->head = m; 569 KASSERT(age >= 0, ("age %d", age)); 570 M_AGE_SET(m, age); 571 m->m_nextpkt = NULL; 572 sq->tail = m; 573 sq->depth++; 574} 575 576static void 577stageq_remove(struct ieee80211_stageq *sq, struct mbuf *mstaged) 578{ 579 struct mbuf *m, *mprev; 580 581 mprev = NULL; 582 for (m = sq->head; m != NULL; m = m->m_nextpkt) { 583 if (m == mstaged) { 584 if (mprev == NULL) 585 sq->head = m->m_nextpkt; 586 else 587 mprev->m_nextpkt = m->m_nextpkt; 588 if (sq->tail == m) 589 sq->tail = mprev; 590 sq->depth--; 591 return; 592 } 593 mprev = m; 594 } 595 printf("%s: packet not found\n", __func__); 596} 597 598static uint32_t 599ff_approx_txtime(struct ieee80211_node *ni, 600 const struct mbuf *m1, const struct mbuf *m2) 601{ 602 struct ieee80211com *ic = ni->ni_ic; 603 struct ieee80211vap *vap = ni->ni_vap; 604 uint32_t framelen; 605 606 /* 607 * Approximate the frame length to be transmitted. A swag to add 608 * the following maximal values to the skb payload: 609 * - 32: 802.11 encap + CRC 610 * - 24: encryption overhead (if wep bit) 611 * - 4 + 6: fast-frame header and padding 612 * - 16: 2 LLC FF tunnel headers 613 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd) 614 */ 615 framelen = m1->m_pkthdr.len + 32 + 616 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR; 617 if (vap->iv_flags & IEEE80211_F_PRIVACY) 618 framelen += 24; 619 if (m2 != NULL) 620 framelen += m2->m_pkthdr.len; 621 return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0); 622} 623 624/* 625 * Check if the supplied frame can be partnered with an existing 626 * or pending frame. Return a reference to any frame that should be 627 * sent on return; otherwise return NULL. 628 */ 629struct mbuf * 630ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m) 631{ 632 struct ieee80211vap *vap = ni->ni_vap; 633 struct ieee80211com *ic = ni->ni_ic; 634 const int pri = M_WME_GETAC(m); 635 struct ieee80211_stageq *sq; 636 struct ieee80211_tx_ampdu *tap; 637 struct mbuf *mstaged; 638 uint32_t txtime, limit; 639 640 /* 641 * Check if the supplied frame can be aggregated. 642 * 643 * NB: we allow EAPOL frames to be aggregated with other ucast traffic. 644 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't 645 * be aggregated with other types of frames when encryption is on? 646 */ 647 IEEE80211_LOCK(ic); 648 tap = &ni->ni_tx_ampdu[pri]; 649 mstaged = tap->txa_private; /* NB: we reuse AMPDU state */ 650 ieee80211_txampdu_count_packet(tap); 651 652 /* 653 * When not in station mode never aggregate a multicast 654 * frame; this insures, for example, that a combined frame 655 * does not require multiple encryption keys. 656 */ 657 if (vap->iv_opmode != IEEE80211_M_STA && 658 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) { 659 /* XXX flush staged frame? */ 660 IEEE80211_UNLOCK(ic); 661 return m; 662 } 663 /* 664 * If there is no frame to combine with and the pps is 665 * too low; then do not attempt to aggregate this frame. 666 */ 667 if (mstaged == NULL && 668 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) { 669 IEEE80211_UNLOCK(ic); 670 return m; 671 } 672 sq = &ic->ic_ff_stageq[pri]; 673 /* 674 * Check the txop limit to insure the aggregate fits. 675 */ 676 limit = IEEE80211_TXOP_TO_US( 677 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit); 678 if (limit != 0 && 679 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) { 680 /* 681 * Aggregate too long, return to the caller for direct 682 * transmission. In addition, flush any pending frame 683 * before sending this one. 684 */ 685 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 686 "%s: txtime %u exceeds txop limit %u\n", 687 __func__, txtime, limit); 688 689 tap->txa_private = NULL; 690 if (mstaged != NULL) 691 stageq_remove(sq, mstaged); 692 IEEE80211_UNLOCK(ic); 693 694 if (mstaged != NULL) { 695 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 696 "%s: flush staged frame", __func__); 697 /* encap and xmit */ 698 ff_transmit(ni, mstaged); 699 } 700 return m; /* NB: original frame */ 701 } 702 /* 703 * An aggregation candidate. If there's a frame to partner 704 * with then combine and return for processing. Otherwise 705 * save this frame and wait for a partner to show up (or 706 * the frame to be flushed). Note that staged frames also 707 * hold their node reference. 708 */ 709 if (mstaged != NULL) { 710 tap->txa_private = NULL; 711 stageq_remove(sq, mstaged); 712 IEEE80211_UNLOCK(ic); 713 714 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 715 "%s: aggregate fast-frame", __func__); 716 /* 717 * Release the node reference; we only need 718 * the one already in mstaged. 719 */ 720 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni, 721 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni)); 722 ieee80211_free_node(ni); 723 724 m->m_nextpkt = NULL; 725 mstaged->m_nextpkt = m; 726 mstaged->m_flags |= M_FF; /* NB: mark for encap work */ 727 } else { 728 KASSERT(tap->txa_private == NULL, 729 ("txa_private %p", tap->txa_private)); 730 tap->txa_private = m; 731 732 stageq_add(sq, m); 733 ic->ic_stageqdepth++; 734 IEEE80211_UNLOCK(ic); 735 736 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni, 737 "%s: stage frame, %u queued", __func__, sq->depth); 738 /* NB: mstaged is NULL */ 739 } 740 return mstaged; 741} 742 743void 744ieee80211_ff_node_init(struct ieee80211_node *ni) 745{ 746 /* 747 * Clean FF state on re-associate. This handles the case 748 * where a station leaves w/o notifying us and then returns 749 * before node is reaped for inactivity. 750 */ 751 ieee80211_ff_node_cleanup(ni); 752} 753 754void 755ieee80211_ff_node_cleanup(struct ieee80211_node *ni) 756{ 757 struct ieee80211com *ic = ni->ni_ic; 758 struct ieee80211_tx_ampdu *tap; 759 struct mbuf *m, *head; 760 int ac; 761 762 IEEE80211_LOCK(ic); 763 head = NULL; 764 for (ac = 0; ac < WME_NUM_AC; ac++) { 765 tap = &ni->ni_tx_ampdu[ac]; 766 m = tap->txa_private; 767 if (m != NULL) { 768 tap->txa_private = NULL; 769 stageq_remove(&ic->ic_ff_stageq[ac], m); 770 m->m_nextpkt = head; 771 head = m; 772 } 773 } 774 IEEE80211_UNLOCK(ic); 775 776 for (m = head; m != NULL; m = m->m_nextpkt) { 777 m_freem(m); 778 ieee80211_free_node(ni); 779 } 780} 781 782/* 783 * Switch between turbo and non-turbo operating modes. 784 * Use the specified channel flags to locate the new 785 * channel, update 802.11 state, and then call back into 786 * the driver to effect the change. 787 */ 788void 789ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags) 790{ 791 struct ieee80211com *ic = vap->iv_ic; 792 struct ieee80211_channel *chan; 793 794 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags); 795 if (chan == NULL) { /* XXX should not happen */ 796 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 797 "%s: no channel with freq %u flags 0x%x\n", 798 __func__, ic->ic_bsschan->ic_freq, newflags); 799 return; 800 } 801 802 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, 803 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__, 804 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)], 805 ieee80211_phymode_name[ieee80211_chan2mode(chan)], 806 chan->ic_freq, chan->ic_flags); 807 808 ic->ic_bsschan = chan; 809 ic->ic_prevchan = ic->ic_curchan; 810 ic->ic_curchan = chan; 811 ic->ic_rt = ieee80211_get_ratetable(chan); 812 ic->ic_set_channel(ic); 813 /* NB: do not need to reset ERP state 'cuz we're in sta mode */ 814} 815 816/* 817 * Return the current ``state'' of an Atheros capbility. 818 * If associated in station mode report the negotiated 819 * setting. Otherwise report the current setting. 820 */ 821static int 822getathcap(struct ieee80211vap *vap, int cap) 823{ 824 if (vap->iv_opmode == IEEE80211_M_STA && 825 vap->iv_state == IEEE80211_S_RUN) 826 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0; 827 else 828 return (vap->iv_flags & cap) != 0; 829} 830 831static int 832superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 833{ 834 switch (ireq->i_type) { 835 case IEEE80211_IOC_FF: 836 ireq->i_val = getathcap(vap, IEEE80211_F_FF); 837 break; 838 case IEEE80211_IOC_TURBOP: 839 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP); 840 break; 841 default: 842 return ENOSYS; 843 } 844 return 0; 845} 846IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211); 847 848static int 849superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq) 850{ 851 switch (ireq->i_type) { 852 case IEEE80211_IOC_FF: 853 if (ireq->i_val) { 854 if ((vap->iv_caps & IEEE80211_C_FF) == 0) 855 return EOPNOTSUPP; 856 vap->iv_flags |= IEEE80211_F_FF; 857 } else 858 vap->iv_flags &= ~IEEE80211_F_FF; 859 return ENETRESET; 860 case IEEE80211_IOC_TURBOP: 861 if (ireq->i_val) { 862 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0) 863 return EOPNOTSUPP; 864 vap->iv_flags |= IEEE80211_F_TURBOP; 865 } else 866 vap->iv_flags &= ~IEEE80211_F_TURBOP; 867 return ENETRESET; 868 default: 869 return ENOSYS; 870 } 871 return 0; 872} 873IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211); 874