1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2002-2009 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 __FBSDID("$FreeBSD$");
30
31 #include "opt_wlan.h"
32
33 #ifdef IEEE80211_SUPPORT_SUPERG
34
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/mbuf.h>
38 #include <sys/kernel.h>
39 #include <sys/endian.h>
40
41 #include <sys/socket.h>
42
43 #include <net/if.h>
44 #include <net/if_var.h>
45 #include <net/if_llc.h>
46 #include <net/if_media.h>
47 #include <net/bpf.h>
48 #include <net/ethernet.h>
49
50 #include <net80211/ieee80211_var.h>
51 #include <net80211/ieee80211_input.h>
52 #include <net80211/ieee80211_phy.h>
53 #include <net80211/ieee80211_superg.h>
54
55 /*
56 * Atheros fast-frame encapsulation format.
57 * FF max payload:
58 * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
59 * 8 + 4 + 4 + 14 + 8 + 1500 + 6 + 14 + 8 + 1500
60 * = 3066
61 */
62 /* fast frame header is 32-bits */
63 #define ATH_FF_PROTO 0x0000003f /* protocol */
64 #define ATH_FF_PROTO_S 0
65 #define ATH_FF_FTYPE 0x000000c0 /* frame type */
66 #define ATH_FF_FTYPE_S 6
67 #define ATH_FF_HLEN32 0x00000300 /* optional hdr length */
68 #define ATH_FF_HLEN32_S 8
69 #define ATH_FF_SEQNUM 0x001ffc00 /* sequence number */
70 #define ATH_FF_SEQNUM_S 10
71 #define ATH_FF_OFFSET 0xffe00000 /* offset to 2nd payload */
72 #define ATH_FF_OFFSET_S 21
73
74 #define ATH_FF_MAX_HDR_PAD 4
75 #define ATH_FF_MAX_SEP_PAD 6
76 #define ATH_FF_MAX_HDR 30
77
78 #define ATH_FF_PROTO_L2TUNNEL 0 /* L2 tunnel protocol */
79 #define ATH_FF_ETH_TYPE 0x88bd /* Ether type for encapsulated frames */
80 #define ATH_FF_SNAP_ORGCODE_0 0x00
81 #define ATH_FF_SNAP_ORGCODE_1 0x03
82 #define ATH_FF_SNAP_ORGCODE_2 0x7f
83
84 #define ATH_FF_TXQMIN 2 /* min txq depth for staging */
85 #define ATH_FF_TXQMAX 50 /* maximum # of queued frames allowed */
86 #define ATH_FF_STAGEMAX 5 /* max waiting period for staged frame*/
87
88 #define ETHER_HEADER_COPY(dst, src) \
89 memcpy(dst, src, sizeof(struct ether_header))
90
91 static int ieee80211_ffppsmin = 2; /* pps threshold for ff aggregation */
92 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLFLAG_RW,
93 &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging");
94 static int ieee80211_ffagemax = -1; /* max time frames held on stage q */
95 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax,
96 CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
97 &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I",
98 "max hold time for fast-frame staging (ms)");
99
100 static void
101 ff_age_all(void *arg, int npending)
102 {
103 struct ieee80211com *ic = arg;
104
105 /* XXX cache timer value somewhere (racy) */
106 ieee80211_ff_age_all(ic, ieee80211_ffagemax + 1);
107 }
108
109 void
110 ieee80211_superg_attach(struct ieee80211com *ic)
111 {
112 struct ieee80211_superg *sg;
113
114 IEEE80211_FF_LOCK_INIT(ic, ic->ic_name);
115
116 sg = (struct ieee80211_superg *) IEEE80211_MALLOC(
117 sizeof(struct ieee80211_superg), M_80211_VAP,
118 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
119 if (sg == NULL) {
120 printf("%s: cannot allocate SuperG state block\n",
121 __func__);
122 return;
123 }
124 TIMEOUT_TASK_INIT(ic->ic_tq, &sg->ff_qtimer, 0, ff_age_all, ic);
125 ic->ic_superg = sg;
126
127 /*
128 * Default to not being so aggressive for FF/AMSDU
129 * aging, otherwise we may hold a frame around
130 * for way too long before we expire it out.
131 */
132 ieee80211_ffagemax = msecs_to_ticks(2);
133 }
134
135 void
136 ieee80211_superg_detach(struct ieee80211com *ic)
137 {
138
139 if (ic->ic_superg != NULL) {
140 struct timeout_task *qtask = &ic->ic_superg->ff_qtimer;
141
142 while (taskqueue_cancel_timeout(ic->ic_tq, qtask, NULL) != 0)
143 taskqueue_drain_timeout(ic->ic_tq, qtask);
144 IEEE80211_FREE(ic->ic_superg, M_80211_VAP);
145 ic->ic_superg = NULL;
146 }
147 IEEE80211_FF_LOCK_DESTROY(ic);
148 }
149
150 void
151 ieee80211_superg_vattach(struct ieee80211vap *vap)
152 {
153 struct ieee80211com *ic = vap->iv_ic;
154
155 if (ic->ic_superg == NULL) /* NB: can't do fast-frames w/o state */
156 vap->iv_caps &= ~IEEE80211_C_FF;
157 if (vap->iv_caps & IEEE80211_C_FF)
158 vap->iv_flags |= IEEE80211_F_FF;
159 /* NB: we only implement sta mode */
160 if (vap->iv_opmode == IEEE80211_M_STA &&
161 (vap->iv_caps & IEEE80211_C_TURBOP))
162 vap->iv_flags |= IEEE80211_F_TURBOP;
163 }
164
165 void
166 ieee80211_superg_vdetach(struct ieee80211vap *vap)
167 {
168 }
169
170 #define ATH_OUI_BYTES 0x00, 0x03, 0x7f
171 /*
172 * Add a WME information element to a frame.
173 */
174 uint8_t *
175 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
176 {
177 static const struct ieee80211_ath_ie info = {
178 .ath_id = IEEE80211_ELEMID_VENDOR,
179 .ath_len = sizeof(struct ieee80211_ath_ie) - 2,
180 .ath_oui = { ATH_OUI_BYTES },
181 .ath_oui_type = ATH_OUI_TYPE,
182 .ath_oui_subtype= ATH_OUI_SUBTYPE,
183 .ath_version = ATH_OUI_VERSION,
184 };
185 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
186
187 memcpy(frm, &info, sizeof(info));
188 ath->ath_capability = caps;
189 if (defkeyix != IEEE80211_KEYIX_NONE) {
190 ath->ath_defkeyix[0] = (defkeyix & 0xff);
191 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
192 } else {
193 ath->ath_defkeyix[0] = 0xff;
194 ath->ath_defkeyix[1] = 0x7f;
195 }
196 return frm + sizeof(info);
197 }
198 #undef ATH_OUI_BYTES
199
200 uint8_t *
201 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
202 {
203 const struct ieee80211vap *vap = bss->ni_vap;
204
205 return ieee80211_add_ath(frm,
206 vap->iv_flags & IEEE80211_F_ATHEROS,
207 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
208 bss->ni_authmode != IEEE80211_AUTH_8021X) ?
209 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
210 }
211
212 void
213 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
214 {
215 const struct ieee80211_ath_ie *ath =
216 (const struct ieee80211_ath_ie *) ie;
217
218 ni->ni_ath_flags = ath->ath_capability;
219 ni->ni_ath_defkeyix = le16dec(&ath->ath_defkeyix);
220 }
221
222 int
223 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
224 const struct ieee80211_frame *wh)
225 {
226 struct ieee80211vap *vap = ni->ni_vap;
227 const struct ieee80211_ath_ie *ath;
228 u_int len = frm[1];
229 int capschanged;
230 uint16_t defkeyix;
231
232 if (len < sizeof(struct ieee80211_ath_ie)-2) {
233 IEEE80211_DISCARD_IE(vap,
234 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
235 wh, "Atheros", "too short, len %u", len);
236 return -1;
237 }
238 ath = (const struct ieee80211_ath_ie *)frm;
239 capschanged = (ni->ni_ath_flags != ath->ath_capability);
240 defkeyix = le16dec(ath->ath_defkeyix);
241 if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
242 ni->ni_ath_flags = ath->ath_capability;
243 ni->ni_ath_defkeyix = defkeyix;
244 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
245 "ath ie change: new caps 0x%x defkeyix 0x%x",
246 ni->ni_ath_flags, ni->ni_ath_defkeyix);
247 }
248 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
249 uint16_t curflags, newflags;
250
251 /*
252 * Check for turbo mode switch. Calculate flags
253 * for the new mode and effect the switch.
254 */
255 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
256 /* NB: BOOST is not in ic_flags, so get it from the ie */
257 if (ath->ath_capability & ATHEROS_CAP_BOOST)
258 newflags |= IEEE80211_CHAN_TURBO;
259 else
260 newflags &= ~IEEE80211_CHAN_TURBO;
261 if (newflags != curflags)
262 ieee80211_dturbo_switch(vap, newflags);
263 }
264 return capschanged;
265 }
266
267 /*
268 * Decap the encapsulated frame pair and dispatch the first
269 * for delivery. The second frame is returned for delivery
270 * via the normal path.
271 */
272 struct mbuf *
273 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
274 {
275 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
276 struct ieee80211vap *vap = ni->ni_vap;
277 struct llc *llc;
278 uint32_t ath;
279 struct mbuf *n;
280 int framelen;
281
282 /* NB: we assume caller does this check for us */
283 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
284 ("ff not negotiated"));
285 /*
286 * Check for fast-frame tunnel encapsulation.
287 */
288 if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
289 return m;
290 if (m->m_len < FF_LLC_SIZE &&
291 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
292 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
293 ni->ni_macaddr, "fast-frame",
294 "%s", "m_pullup(llc) failed");
295 vap->iv_stats.is_rx_tooshort++;
296 return NULL;
297 }
298 llc = (struct llc *)(mtod(m, uint8_t *) +
299 sizeof(struct ether_header));
300 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
301 return m;
302 m_adj(m, FF_LLC_SIZE);
303 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
304 if (_IEEE80211_MASKSHIFT(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
305 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
306 ni->ni_macaddr, "fast-frame",
307 "unsupport tunnel protocol, header 0x%x", ath);
308 vap->iv_stats.is_ff_badhdr++;
309 m_freem(m);
310 return NULL;
311 }
312 /* NB: skip header and alignment padding */
313 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
314
315 vap->iv_stats.is_ff_decap++;
316
317 /*
318 * Decap the first frame, bust it apart from the
319 * second and deliver; then decap the second frame
320 * and return it to the caller for normal delivery.
321 */
322 m = ieee80211_decap1(m, &framelen);
323 if (m == NULL) {
324 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
325 ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
326 vap->iv_stats.is_ff_tooshort++;
327 return NULL;
328 }
329 n = m_split(m, framelen, IEEE80211_M_NOWAIT);
330 if (n == NULL) {
331 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
332 ni->ni_macaddr, "fast-frame",
333 "%s", "unable to split encapsulated frames");
334 vap->iv_stats.is_ff_split++;
335 m_freem(m); /* NB: must reclaim */
336 return NULL;
337 }
338 /* XXX not right for WDS */
339 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */
340
341 /*
342 * Decap second frame.
343 */
344 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */
345 n = ieee80211_decap1(n, &framelen);
346 if (n == NULL) {
347 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
348 ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
349 vap->iv_stats.is_ff_tooshort++;
350 }
351 /* XXX verify framelen against mbuf contents */
352 return n; /* 2nd delivered by caller */
353 #undef FF_LLC_SIZE
354 }
355
356 /*
357 * Fast frame encapsulation. There must be two packets
358 * chained with m_nextpkt. We do header adjustment for
359 * each, add the tunnel encapsulation, and then concatenate
360 * the mbuf chains to form a single frame for transmission.
361 */
362 struct mbuf *
363 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
364 struct ieee80211_key *key)
365 {
366 struct mbuf *m2;
367 struct ether_header eh1, eh2;
368 struct llc *llc;
369 struct mbuf *m;
370 int pad;
371
372 m2 = m1->m_nextpkt;
373 if (m2 == NULL) {
374 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
375 "%s: only one frame\n", __func__);
376 goto bad;
377 }
378 m1->m_nextpkt = NULL;
379
380 /*
381 * Adjust to include 802.11 header requirement.
382 */
383 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
384 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
385 m1 = ieee80211_mbuf_adjust(vap, hdrspace, key, m1);
386 if (m1 == NULL) {
387 printf("%s: failed initial mbuf_adjust\n", __func__);
388 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
389 m_freem(m2);
390 goto bad;
391 }
392
393 /*
394 * Copy second frame's Ethernet header out of line
395 * and adjust for possible padding in case there isn't room
396 * at the end of first frame.
397 */
398 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
399 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
400 m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
401 if (m2 == NULL) {
402 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
403 printf("%s: failed second \n", __func__);
404 goto bad;
405 }
406
407 /*
408 * Now do tunnel encapsulation. First, each
409 * frame gets a standard encapsulation.
410 */
411 m1 = ieee80211_ff_encap1(vap, m1, &eh1);
412 if (m1 == NULL)
413 goto bad;
414 m2 = ieee80211_ff_encap1(vap, m2, &eh2);
415 if (m2 == NULL)
416 goto bad;
417
418 /*
419 * Pad leading frame to a 4-byte boundary. If there
420 * is space at the end of the first frame, put it
421 * there; otherwise prepend to the front of the second
422 * frame. We know doing the second will always work
423 * because we reserve space above. We prefer appending
424 * as this typically has better DMA alignment properties.
425 */
426 for (m = m1; m->m_next != NULL; m = m->m_next)
427 ;
428 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
429 if (pad) {
430 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */
431 m2->m_data -= pad;
432 m2->m_len += pad;
433 m2->m_pkthdr.len += pad;
434 } else { /* append to first */
435 m->m_len += pad;
436 m1->m_pkthdr.len += pad;
437 }
438 }
439
440 /*
441 * A-MSDU's are just appended; the "I'm A-MSDU!" bit is in the
442 * QoS header.
443 *
444 * XXX optimize by prepending together
445 */
446 m->m_next = m2; /* NB: last mbuf from above */
447 m1->m_pkthdr.len += m2->m_pkthdr.len;
448 M_PREPEND(m1, sizeof(uint32_t)+2, IEEE80211_M_NOWAIT);
449 if (m1 == NULL) { /* XXX cannot happen */
450 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
451 "%s: no space for tunnel header\n", __func__);
452 vap->iv_stats.is_tx_nobuf++;
453 return NULL;
454 }
455 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
456
457 M_PREPEND(m1, sizeof(struct llc), IEEE80211_M_NOWAIT);
458 if (m1 == NULL) { /* XXX cannot happen */
459 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
460 "%s: no space for llc header\n", __func__);
461 vap->iv_stats.is_tx_nobuf++;
462 return NULL;
463 }
464 llc = mtod(m1, struct llc *);
465 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
466 llc->llc_control = LLC_UI;
467 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
468 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
469 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
470 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
471
472 vap->iv_stats.is_ff_encap++;
473
474 return m1;
475 bad:
476 vap->iv_stats.is_ff_encapfail++;
477 if (m1 != NULL)
478 m_freem(m1);
479 if (m2 != NULL)
480 m_freem(m2);
481 return NULL;
482 }
483
484 /*
485 * A-MSDU encapsulation.
486 *
487 * This assumes just two frames for now, since we're borrowing the
488 * same queuing code and infrastructure as fast-frames.
489 *
490 * There must be two packets chained with m_nextpkt.
491 * We do header adjustment for each, and then concatenate the mbuf chains
492 * to form a single frame for transmission.
493 */
494 struct mbuf *
495 ieee80211_amsdu_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
496 struct ieee80211_key *key)
497 {
498 struct mbuf *m2;
499 struct ether_header eh1, eh2;
500 struct mbuf *m;
501 int pad;
502
503 m2 = m1->m_nextpkt;
504 if (m2 == NULL) {
505 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
506 "%s: only one frame\n", __func__);
507 goto bad;
508 }
509 m1->m_nextpkt = NULL;
510
511 /*
512 * Include A-MSDU header in adjusting header layout.
513 */
514 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
515 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
516 m1 = ieee80211_mbuf_adjust(vap,
517 hdrspace + sizeof(struct llc) + sizeof(uint32_t) +
518 sizeof(struct ether_header),
519 key, m1);
520 if (m1 == NULL) {
521 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
522 m_freem(m2);
523 goto bad;
524 }
525
526 /*
527 * Copy second frame's Ethernet header out of line
528 * and adjust for encapsulation headers. Note that
529 * we make room for padding in case there isn't room
530 * at the end of first frame.
531 */
532 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
533 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
534 m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
535 if (m2 == NULL) {
536 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
537 goto bad;
538 }
539
540 /*
541 * Now do tunnel encapsulation. First, each
542 * frame gets a standard encapsulation.
543 */
544 m1 = ieee80211_ff_encap1(vap, m1, &eh1);
545 if (m1 == NULL)
546 goto bad;
547 m2 = ieee80211_ff_encap1(vap, m2, &eh2);
548 if (m2 == NULL)
549 goto bad;
550
551 /*
552 * Pad leading frame to a 4-byte boundary. If there
553 * is space at the end of the first frame, put it
554 * there; otherwise prepend to the front of the second
555 * frame. We know doing the second will always work
556 * because we reserve space above. We prefer appending
557 * as this typically has better DMA alignment properties.
558 */
559 for (m = m1; m->m_next != NULL; m = m->m_next)
560 ;
561 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
562 if (pad) {
563 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */
564 m2->m_data -= pad;
565 m2->m_len += pad;
566 m2->m_pkthdr.len += pad;
567 } else { /* append to first */
568 m->m_len += pad;
569 m1->m_pkthdr.len += pad;
570 }
571 }
572
573 /*
574 * Now, stick 'em together.
575 */
576 m->m_next = m2; /* NB: last mbuf from above */
577 m1->m_pkthdr.len += m2->m_pkthdr.len;
578
579 vap->iv_stats.is_amsdu_encap++;
580
581 return m1;
582 bad:
583 vap->iv_stats.is_amsdu_encapfail++;
584 if (m1 != NULL)
585 m_freem(m1);
586 if (m2 != NULL)
587 m_freem(m2);
588 return NULL;
589 }
590
591 static void
592 ff_transmit(struct ieee80211_node *ni, struct mbuf *m)
593 {
594 struct ieee80211vap *vap = ni->ni_vap;
595 struct ieee80211com *ic = ni->ni_ic;
596
597 IEEE80211_TX_LOCK_ASSERT(ic);
598
599 /* encap and xmit */
600 m = ieee80211_encap(vap, ni, m);
601 if (m != NULL)
602 (void) ieee80211_parent_xmitpkt(ic, m);
603 else
604 ieee80211_free_node(ni);
605 }
606
607 /*
608 * Flush frames to device; note we re-use the linked list
609 * the frames were stored on and use the sentinel (unchanged)
610 * which may be non-NULL.
611 */
612 static void
613 ff_flush(struct mbuf *head, struct mbuf *last)
614 {
615 struct mbuf *m, *next;
616 struct ieee80211_node *ni;
617 struct ieee80211vap *vap;
618
619 for (m = head; m != last; m = next) {
620 next = m->m_nextpkt;
621 m->m_nextpkt = NULL;
622
623 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
624 vap = ni->ni_vap;
625
626 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
627 "%s: flush frame, age %u", __func__, M_AGE_GET(m));
628 vap->iv_stats.is_ff_flush++;
629
630 ff_transmit(ni, m);
631 }
632 }
633
634 /*
635 * Age frames on the staging queue.
636 */
637 void
638 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq,
639 int quanta)
640 {
641 struct mbuf *m, *head;
642 struct ieee80211_node *ni;
643
644 IEEE80211_FF_LOCK(ic);
645 if (sq->depth == 0) {
646 IEEE80211_FF_UNLOCK(ic);
647 return; /* nothing to do */
648 }
649
650 KASSERT(sq->head != NULL, ("stageq empty"));
651
652 head = sq->head;
653 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) {
654 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
655
656 /* clear staging ref to frame */
657 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
658 KASSERT(ni->ni_tx_superg[tid] == m, ("staging queue empty"));
659 ni->ni_tx_superg[tid] = NULL;
660
661 sq->head = m->m_nextpkt;
662 sq->depth--;
663 }
664 if (m == NULL)
665 sq->tail = NULL;
666 else
667 M_AGE_SUB(m, quanta);
668 IEEE80211_FF_UNLOCK(ic);
669
670 IEEE80211_TX_LOCK(ic);
671 ff_flush(head, m);
672 IEEE80211_TX_UNLOCK(ic);
673 }
674
675 static void
676 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m)
677 {
678 int age = ieee80211_ffagemax;
679
680 IEEE80211_FF_LOCK_ASSERT(ic);
681
682 if (sq->tail != NULL) {
683 sq->tail->m_nextpkt = m;
684 age -= M_AGE_GET(sq->head);
685 } else {
686 sq->head = m;
687
688 struct timeout_task *qtask = &ic->ic_superg->ff_qtimer;
689 taskqueue_enqueue_timeout(ic->ic_tq, qtask, age);
690 }
691 KASSERT(age >= 0, ("age %d", age));
692 M_AGE_SET(m, age);
693 m->m_nextpkt = NULL;
694 sq->tail = m;
695 sq->depth++;
696 }
697
698 static void
699 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged)
700 {
701 struct mbuf *m, *mprev;
702
703 IEEE80211_FF_LOCK_ASSERT(ic);
704
705 mprev = NULL;
706 for (m = sq->head; m != NULL; m = m->m_nextpkt) {
707 if (m == mstaged) {
708 if (mprev == NULL)
709 sq->head = m->m_nextpkt;
710 else
711 mprev->m_nextpkt = m->m_nextpkt;
712 if (sq->tail == m)
713 sq->tail = mprev;
714 sq->depth--;
715 return;
716 }
717 mprev = m;
718 }
719 printf("%s: packet not found\n", __func__);
720 }
721
722 static uint32_t
723 ff_approx_txtime(struct ieee80211_node *ni,
724 const struct mbuf *m1, const struct mbuf *m2)
725 {
726 struct ieee80211com *ic = ni->ni_ic;
727 struct ieee80211vap *vap = ni->ni_vap;
728 uint32_t framelen;
729 uint32_t frame_time;
730
731 /*
732 * Approximate the frame length to be transmitted. A swag to add
733 * the following maximal values to the skb payload:
734 * - 32: 802.11 encap + CRC
735 * - 24: encryption overhead (if wep bit)
736 * - 4 + 6: fast-frame header and padding
737 * - 16: 2 LLC FF tunnel headers
738 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd)
739 */
740 framelen = m1->m_pkthdr.len + 32 +
741 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR;
742 if (vap->iv_flags & IEEE80211_F_PRIVACY)
743 framelen += 24;
744 if (m2 != NULL)
745 framelen += m2->m_pkthdr.len;
746
747 /*
748 * For now, we assume non-shortgi, 20MHz, just because I want to
749 * at least test 802.11n.
750 */
751 if (ni->ni_txrate & IEEE80211_RATE_MCS)
752 frame_time = ieee80211_compute_duration_ht(framelen,
753 ni->ni_txrate,
754 IEEE80211_HT_RC_2_STREAMS(ni->ni_txrate),
755 0, /* isht40 */
756 0); /* isshortgi */
757 else
758 frame_time = ieee80211_compute_duration(ic->ic_rt, framelen,
759 ni->ni_txrate, 0);
760 return (frame_time);
761 }
762
763 /*
764 * Check if the supplied frame can be partnered with an existing
765 * or pending frame. Return a reference to any frame that should be
766 * sent on return; otherwise return NULL.
767 */
768 struct mbuf *
769 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m)
770 {
771 struct ieee80211vap *vap = ni->ni_vap;
772 struct ieee80211com *ic = ni->ni_ic;
773 struct ieee80211_superg *sg = ic->ic_superg;
774 const int pri = M_WME_GETAC(m);
775 struct ieee80211_stageq *sq;
776 struct ieee80211_tx_ampdu *tap;
777 struct mbuf *mstaged;
778 uint32_t txtime, limit;
779
780 IEEE80211_TX_UNLOCK_ASSERT(ic);
781
782 IEEE80211_LOCK(ic);
783 limit = IEEE80211_TXOP_TO_US(
784 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit);
785 IEEE80211_UNLOCK(ic);
786
787 /*
788 * Check if the supplied frame can be aggregated.
789 *
790 * NB: we allow EAPOL frames to be aggregated with other ucast traffic.
791 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't
792 * be aggregated with other types of frames when encryption is on?
793 */
794 IEEE80211_FF_LOCK(ic);
795 tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)];
796 mstaged = ni->ni_tx_superg[WME_AC_TO_TID(pri)];
797 /* XXX NOTE: reusing packet counter state from A-MPDU */
798 /*
799 * XXX NOTE: this means we're double-counting; it should just
800 * be done in ieee80211_output.c once for both superg and A-MPDU.
801 */
802 ieee80211_txampdu_count_packet(tap);
803
804 /*
805 * When not in station mode never aggregate a multicast
806 * frame; this insures, for example, that a combined frame
807 * does not require multiple encryption keys.
808 */
809 if (vap->iv_opmode != IEEE80211_M_STA &&
810 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) {
811 /* XXX flush staged frame? */
812 IEEE80211_FF_UNLOCK(ic);
813 return m;
814 }
815 /*
816 * If there is no frame to combine with and the pps is
817 * too low; then do not attempt to aggregate this frame.
818 */
819 if (mstaged == NULL &&
820 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) {
821 IEEE80211_FF_UNLOCK(ic);
822 return m;
823 }
824 sq = &sg->ff_stageq[pri];
825 /*
826 * Check the txop limit to insure the aggregate fits.
827 */
828 if (limit != 0 &&
829 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) {
830 /*
831 * Aggregate too long, return to the caller for direct
832 * transmission. In addition, flush any pending frame
833 * before sending this one.
834 */
835 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
836 "%s: txtime %u exceeds txop limit %u\n",
837 __func__, txtime, limit);
838
839 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
840 if (mstaged != NULL)
841 stageq_remove(ic, sq, mstaged);
842 IEEE80211_FF_UNLOCK(ic);
843
844 if (mstaged != NULL) {
845 IEEE80211_TX_LOCK(ic);
846 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
847 "%s: flush staged frame", __func__);
848 /* encap and xmit */
849 ff_transmit(ni, mstaged);
850 IEEE80211_TX_UNLOCK(ic);
851 }
852 return m; /* NB: original frame */
853 }
854 /*
855 * An aggregation candidate. If there's a frame to partner
856 * with then combine and return for processing. Otherwise
857 * save this frame and wait for a partner to show up (or
858 * the frame to be flushed). Note that staged frames also
859 * hold their node reference.
860 */
861 if (mstaged != NULL) {
862 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
863 stageq_remove(ic, sq, mstaged);
864 IEEE80211_FF_UNLOCK(ic);
865
866 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
867 "%s: aggregate fast-frame", __func__);
868 /*
869 * Release the node reference; we only need
870 * the one already in mstaged.
871 */
872 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni,
873 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni));
874 ieee80211_free_node(ni);
875
876 m->m_nextpkt = NULL;
877 mstaged->m_nextpkt = m;
878 mstaged->m_flags |= M_FF; /* NB: mark for encap work */
879 } else {
880 KASSERT(ni->ni_tx_superg[WME_AC_TO_TID(pri)] == NULL,
881 ("ni_tx_superg[]: %p",
882 ni->ni_tx_superg[WME_AC_TO_TID(pri)]));
883 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = m;
884
885 stageq_add(ic, sq, m);
886 IEEE80211_FF_UNLOCK(ic);
887
888 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
889 "%s: stage frame, %u queued", __func__, sq->depth);
890 /* NB: mstaged is NULL */
891 }
892 return mstaged;
893 }
894
895 struct mbuf *
896 ieee80211_amsdu_check(struct ieee80211_node *ni, struct mbuf *m)
897 {
898 /*
899 * XXX TODO: actually enforce the node support
900 * and HTCAP requirements for the maximum A-MSDU
901 * size.
902 */
903
904 /* First: software A-MSDU transmit? */
905 if (! ieee80211_amsdu_tx_ok(ni))
906 return (m);
907
908 /* Next - EAPOL? Nope, don't aggregate; we don't QoS encap them */
909 if (m->m_flags & (M_EAPOL | M_MCAST | M_BCAST))
910 return (m);
911
912 /* Next - needs to be a data frame, non-broadcast, etc */
913 if (ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost))
914 return (m);
915
916 return (ieee80211_ff_check(ni, m));
917 }
918
919 void
920 ieee80211_ff_node_init(struct ieee80211_node *ni)
921 {
922 /*
923 * Clean FF state on re-associate. This handles the case
924 * where a station leaves w/o notifying us and then returns
925 * before node is reaped for inactivity.
926 */
927 ieee80211_ff_node_cleanup(ni);
928 }
929
930 void
931 ieee80211_ff_node_cleanup(struct ieee80211_node *ni)
932 {
933 struct ieee80211com *ic = ni->ni_ic;
934 struct ieee80211_superg *sg = ic->ic_superg;
935 struct mbuf *m, *next_m, *head;
936 int tid;
937
938 IEEE80211_FF_LOCK(ic);
939 head = NULL;
940 for (tid = 0; tid < WME_NUM_TID; tid++) {
941 int ac = TID_TO_WME_AC(tid);
942 /*
943 * XXX Initialise the packet counter.
944 *
945 * This may be double-work for 11n stations;
946 * but without it we never setup things.
947 */
948 ieee80211_txampdu_init_pps(&ni->ni_tx_ampdu[tid]);
949 m = ni->ni_tx_superg[tid];
950 if (m != NULL) {
951 ni->ni_tx_superg[tid] = NULL;
952 stageq_remove(ic, &sg->ff_stageq[ac], m);
953 m->m_nextpkt = head;
954 head = m;
955 }
956 }
957 IEEE80211_FF_UNLOCK(ic);
958
959 /*
960 * Free mbufs, taking care to not dereference the mbuf after
961 * we free it (hence grabbing m_nextpkt before we free it.)
962 */
963 m = head;
964 while (m != NULL) {
965 next_m = m->m_nextpkt;
966 m_freem(m);
967 ieee80211_free_node(ni);
968 m = next_m;
969 }
970 }
971
972 /*
973 * Switch between turbo and non-turbo operating modes.
974 * Use the specified channel flags to locate the new
975 * channel, update 802.11 state, and then call back into
976 * the driver to effect the change.
977 */
978 void
979 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
980 {
981 struct ieee80211com *ic = vap->iv_ic;
982 struct ieee80211_channel *chan;
983
984 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
985 if (chan == NULL) { /* XXX should not happen */
986 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
987 "%s: no channel with freq %u flags 0x%x\n",
988 __func__, ic->ic_bsschan->ic_freq, newflags);
989 return;
990 }
991
992 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
993 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
994 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
995 ieee80211_phymode_name[ieee80211_chan2mode(chan)],
996 chan->ic_freq, chan->ic_flags);
997
998 ic->ic_bsschan = chan;
999 ic->ic_prevchan = ic->ic_curchan;
1000 ic->ic_curchan = chan;
1001 ic->ic_rt = ieee80211_get_ratetable(chan);
1002 ic->ic_set_channel(ic);
1003 ieee80211_radiotap_chan_change(ic);
1004 /* NB: do not need to reset ERP state 'cuz we're in sta mode */
1005 }
1006
1007 /*
1008 * Return the current ``state'' of an Atheros capbility.
1009 * If associated in station mode report the negotiated
1010 * setting. Otherwise report the current setting.
1011 */
1012 static int
1013 getathcap(struct ieee80211vap *vap, int cap)
1014 {
1015 if (vap->iv_opmode == IEEE80211_M_STA &&
1016 vap->iv_state == IEEE80211_S_RUN)
1017 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
1018 else
1019 return (vap->iv_flags & cap) != 0;
1020 }
1021
1022 static int
1023 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1024 {
1025 switch (ireq->i_type) {
1026 case IEEE80211_IOC_FF:
1027 ireq->i_val = getathcap(vap, IEEE80211_F_FF);
1028 break;
1029 case IEEE80211_IOC_TURBOP:
1030 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
1031 break;
1032 default:
1033 return ENOSYS;
1034 }
1035 return 0;
1036 }
1037 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
1038
1039 static int
1040 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1041 {
1042 switch (ireq->i_type) {
1043 case IEEE80211_IOC_FF:
1044 if (ireq->i_val) {
1045 if ((vap->iv_caps & IEEE80211_C_FF) == 0)
1046 return EOPNOTSUPP;
1047 vap->iv_flags |= IEEE80211_F_FF;
1048 } else
1049 vap->iv_flags &= ~IEEE80211_F_FF;
1050 return ENETRESET;
1051 case IEEE80211_IOC_TURBOP:
1052 if (ireq->i_val) {
1053 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
1054 return EOPNOTSUPP;
1055 vap->iv_flags |= IEEE80211_F_TURBOP;
1056 } else
1057 vap->iv_flags &= ~IEEE80211_F_TURBOP;
1058 return ENETRESET;
1059 default:
1060 return ENOSYS;
1061 }
1062 }
1063 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);
1064
1065 #endif /* IEEE80211_SUPPORT_SUPERG */
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