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("$FreeBSD$");
28
29 #include "opt_wlan.h"
30
31 #ifdef IEEE80211_SUPPORT_SUPERG
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/mbuf.h>
36 #include <sys/kernel.h>
37 #include <sys/endian.h>
38
39 #include <sys/socket.h>
40
41 #include <net/if.h>
42 #include <net/if_var.h>
43 #include <net/if_llc.h>
44 #include <net/if_media.h>
45 #include <net/bpf.h>
46 #include <net/ethernet.h>
47
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_input.h>
50 #include <net80211/ieee80211_phy.h>
51 #include <net80211/ieee80211_superg.h>
52
53 /*
54 * Atheros fast-frame encapsulation format.
55 * FF max payload:
56 * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
57 * 8 + 4 + 4 + 14 + 8 + 1500 + 6 + 14 + 8 + 1500
58 * = 3066
59 */
60 /* fast frame header is 32-bits */
61 #define ATH_FF_PROTO 0x0000003f /* protocol */
62 #define ATH_FF_PROTO_S 0
63 #define ATH_FF_FTYPE 0x000000c0 /* frame type */
64 #define ATH_FF_FTYPE_S 6
65 #define ATH_FF_HLEN32 0x00000300 /* optional hdr length */
66 #define ATH_FF_HLEN32_S 8
67 #define ATH_FF_SEQNUM 0x001ffc00 /* sequence number */
68 #define ATH_FF_SEQNUM_S 10
69 #define ATH_FF_OFFSET 0xffe00000 /* offset to 2nd payload */
70 #define ATH_FF_OFFSET_S 21
71
72 #define ATH_FF_MAX_HDR_PAD 4
73 #define ATH_FF_MAX_SEP_PAD 6
74 #define ATH_FF_MAX_HDR 30
75
76 #define ATH_FF_PROTO_L2TUNNEL 0 /* L2 tunnel protocol */
77 #define ATH_FF_ETH_TYPE 0x88bd /* Ether type for encapsulated frames */
78 #define ATH_FF_SNAP_ORGCODE_0 0x00
79 #define ATH_FF_SNAP_ORGCODE_1 0x03
80 #define ATH_FF_SNAP_ORGCODE_2 0x7f
81
82 #define ATH_FF_TXQMIN 2 /* min txq depth for staging */
83 #define ATH_FF_TXQMAX 50 /* maximum # of queued frames allowed */
84 #define ATH_FF_STAGEMAX 5 /* max waiting period for staged frame*/
85
86 #define ETHER_HEADER_COPY(dst, src) \
87 memcpy(dst, src, sizeof(struct ether_header))
88
89 static int ieee80211_ffppsmin = 2; /* pps threshold for ff aggregation */
90 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLFLAG_RW,
91 &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging");
92 static int ieee80211_ffagemax = -1; /* max time frames held on stage q */
93 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW,
94 &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I",
95 "max hold time for fast-frame staging (ms)");
96
97 void
98 ieee80211_superg_attach(struct ieee80211com *ic)
99 {
100 struct ieee80211_superg *sg;
101
102 IEEE80211_FF_LOCK_INIT(ic, ic->ic_name);
103
104 sg = (struct ieee80211_superg *) IEEE80211_MALLOC(
105 sizeof(struct ieee80211_superg), M_80211_VAP,
106 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
107 if (sg == NULL) {
108 printf("%s: cannot allocate SuperG state block\n",
109 __func__);
110 return;
111 }
112 ic->ic_superg = sg;
113
114 /*
115 * Default to not being so aggressive for FF/AMSDU
116 * aging, otherwise we may hold a frame around
117 * for way too long before we expire it out.
118 */
119 ieee80211_ffagemax = msecs_to_ticks(2);
120 }
121
122 void
123 ieee80211_superg_detach(struct ieee80211com *ic)
124 {
125 IEEE80211_FF_LOCK_DESTROY(ic);
126
127 if (ic->ic_superg != NULL) {
128 IEEE80211_FREE(ic->ic_superg, M_80211_VAP);
129 ic->ic_superg = NULL;
130 }
131 }
132
133 void
134 ieee80211_superg_vattach(struct ieee80211vap *vap)
135 {
136 struct ieee80211com *ic = vap->iv_ic;
137
138 if (ic->ic_superg == NULL) /* NB: can't do fast-frames w/o state */
139 vap->iv_caps &= ~IEEE80211_C_FF;
140 if (vap->iv_caps & IEEE80211_C_FF)
141 vap->iv_flags |= IEEE80211_F_FF;
142 /* NB: we only implement sta mode */
143 if (vap->iv_opmode == IEEE80211_M_STA &&
144 (vap->iv_caps & IEEE80211_C_TURBOP))
145 vap->iv_flags |= IEEE80211_F_TURBOP;
146 }
147
148 void
149 ieee80211_superg_vdetach(struct ieee80211vap *vap)
150 {
151 }
152
153 #define ATH_OUI_BYTES 0x00, 0x03, 0x7f
154 /*
155 * Add a WME information element to a frame.
156 */
157 uint8_t *
158 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
159 {
160 static const struct ieee80211_ath_ie info = {
161 .ath_id = IEEE80211_ELEMID_VENDOR,
162 .ath_len = sizeof(struct ieee80211_ath_ie) - 2,
163 .ath_oui = { ATH_OUI_BYTES },
164 .ath_oui_type = ATH_OUI_TYPE,
165 .ath_oui_subtype= ATH_OUI_SUBTYPE,
166 .ath_version = ATH_OUI_VERSION,
167 };
168 struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
169
170 memcpy(frm, &info, sizeof(info));
171 ath->ath_capability = caps;
172 if (defkeyix != IEEE80211_KEYIX_NONE) {
173 ath->ath_defkeyix[0] = (defkeyix & 0xff);
174 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
175 } else {
176 ath->ath_defkeyix[0] = 0xff;
177 ath->ath_defkeyix[1] = 0x7f;
178 }
179 return frm + sizeof(info);
180 }
181 #undef ATH_OUI_BYTES
182
183 uint8_t *
184 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
185 {
186 const struct ieee80211vap *vap = bss->ni_vap;
187
188 return ieee80211_add_ath(frm,
189 vap->iv_flags & IEEE80211_F_ATHEROS,
190 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
191 bss->ni_authmode != IEEE80211_AUTH_8021X) ?
192 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
193 }
194
195 void
196 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
197 {
198 const struct ieee80211_ath_ie *ath =
199 (const struct ieee80211_ath_ie *) ie;
200
201 ni->ni_ath_flags = ath->ath_capability;
202 ni->ni_ath_defkeyix = le16dec(&ath->ath_defkeyix);
203 }
204
205 int
206 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
207 const struct ieee80211_frame *wh)
208 {
209 struct ieee80211vap *vap = ni->ni_vap;
210 const struct ieee80211_ath_ie *ath;
211 u_int len = frm[1];
212 int capschanged;
213 uint16_t defkeyix;
214
215 if (len < sizeof(struct ieee80211_ath_ie)-2) {
216 IEEE80211_DISCARD_IE(vap,
217 IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
218 wh, "Atheros", "too short, len %u", len);
219 return -1;
220 }
221 ath = (const struct ieee80211_ath_ie *)frm;
222 capschanged = (ni->ni_ath_flags != ath->ath_capability);
223 defkeyix = le16dec(ath->ath_defkeyix);
224 if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
225 ni->ni_ath_flags = ath->ath_capability;
226 ni->ni_ath_defkeyix = defkeyix;
227 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
228 "ath ie change: new caps 0x%x defkeyix 0x%x",
229 ni->ni_ath_flags, ni->ni_ath_defkeyix);
230 }
231 if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
232 uint16_t curflags, newflags;
233
234 /*
235 * Check for turbo mode switch. Calculate flags
236 * for the new mode and effect the switch.
237 */
238 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
239 /* NB: BOOST is not in ic_flags, so get it from the ie */
240 if (ath->ath_capability & ATHEROS_CAP_BOOST)
241 newflags |= IEEE80211_CHAN_TURBO;
242 else
243 newflags &= ~IEEE80211_CHAN_TURBO;
244 if (newflags != curflags)
245 ieee80211_dturbo_switch(vap, newflags);
246 }
247 return capschanged;
248 }
249
250 /*
251 * Decap the encapsulated frame pair and dispatch the first
252 * for delivery. The second frame is returned for delivery
253 * via the normal path.
254 */
255 struct mbuf *
256 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
257 {
258 #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc))
259 #define MS(x,f) (((x) & f) >> f##_S)
260 struct ieee80211vap *vap = ni->ni_vap;
261 struct llc *llc;
262 uint32_t ath;
263 struct mbuf *n;
264 int framelen;
265
266 /* NB: we assume caller does this check for us */
267 KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
268 ("ff not negotiated"));
269 /*
270 * Check for fast-frame tunnel encapsulation.
271 */
272 if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
273 return m;
274 if (m->m_len < FF_LLC_SIZE &&
275 (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
276 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
277 ni->ni_macaddr, "fast-frame",
278 "%s", "m_pullup(llc) failed");
279 vap->iv_stats.is_rx_tooshort++;
280 return NULL;
281 }
282 llc = (struct llc *)(mtod(m, uint8_t *) +
283 sizeof(struct ether_header));
284 if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
285 return m;
286 m_adj(m, FF_LLC_SIZE);
287 m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
288 if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
289 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
290 ni->ni_macaddr, "fast-frame",
291 "unsupport tunnel protocol, header 0x%x", ath);
292 vap->iv_stats.is_ff_badhdr++;
293 m_freem(m);
294 return NULL;
295 }
296 /* NB: skip header and alignment padding */
297 m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
298
299 vap->iv_stats.is_ff_decap++;
300
301 /*
302 * Decap the first frame, bust it apart from the
303 * second and deliver; then decap the second frame
304 * and return it to the caller for normal delivery.
305 */
306 m = ieee80211_decap1(m, &framelen);
307 if (m == NULL) {
308 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
309 ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
310 vap->iv_stats.is_ff_tooshort++;
311 return NULL;
312 }
313 n = m_split(m, framelen, M_NOWAIT);
314 if (n == NULL) {
315 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
316 ni->ni_macaddr, "fast-frame",
317 "%s", "unable to split encapsulated frames");
318 vap->iv_stats.is_ff_split++;
319 m_freem(m); /* NB: must reclaim */
320 return NULL;
321 }
322 /* XXX not right for WDS */
323 vap->iv_deliver_data(vap, ni, m); /* 1st of pair */
324
325 /*
326 * Decap second frame.
327 */
328 m_adj(n, roundup2(framelen, 4) - framelen); /* padding */
329 n = ieee80211_decap1(n, &framelen);
330 if (n == NULL) {
331 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
332 ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
333 vap->iv_stats.is_ff_tooshort++;
334 }
335 /* XXX verify framelen against mbuf contents */
336 return n; /* 2nd delivered by caller */
337 #undef MS
338 #undef FF_LLC_SIZE
339 }
340
341 /*
342 * Fast frame encapsulation. There must be two packets
343 * chained with m_nextpkt. We do header adjustment for
344 * each, add the tunnel encapsulation, and then concatenate
345 * the mbuf chains to form a single frame for transmission.
346 */
347 struct mbuf *
348 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
349 struct ieee80211_key *key)
350 {
351 struct mbuf *m2;
352 struct ether_header eh1, eh2;
353 struct llc *llc;
354 struct mbuf *m;
355 int pad;
356
357 m2 = m1->m_nextpkt;
358 if (m2 == NULL) {
359 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
360 "%s: only one frame\n", __func__);
361 goto bad;
362 }
363 m1->m_nextpkt = NULL;
364
365 /*
366 * Adjust to include 802.11 header requirement.
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, hdrspace, key, m1);
371 if (m1 == NULL) {
372 printf("%s: failed initial mbuf_adjust\n", __func__);
373 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
374 m_freem(m2);
375 goto bad;
376 }
377
378 /*
379 * Copy second frame's Ethernet header out of line
380 * and adjust for possible padding in case there isn't room
381 * at the end of first frame.
382 */
383 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
384 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
385 m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
386 if (m2 == NULL) {
387 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
388 printf("%s: failed second \n", __func__);
389 goto bad;
390 }
391
392 /*
393 * Now do tunnel encapsulation. First, each
394 * frame gets a standard encapsulation.
395 */
396 m1 = ieee80211_ff_encap1(vap, m1, &eh1);
397 if (m1 == NULL)
398 goto bad;
399 m2 = ieee80211_ff_encap1(vap, m2, &eh2);
400 if (m2 == NULL)
401 goto bad;
402
403 /*
404 * Pad leading frame to a 4-byte boundary. If there
405 * is space at the end of the first frame, put it
406 * there; otherwise prepend to the front of the second
407 * frame. We know doing the second will always work
408 * because we reserve space above. We prefer appending
409 * as this typically has better DMA alignment properties.
410 */
411 for (m = m1; m->m_next != NULL; m = m->m_next)
412 ;
413 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
414 if (pad) {
415 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */
416 m2->m_data -= pad;
417 m2->m_len += pad;
418 m2->m_pkthdr.len += pad;
419 } else { /* append to first */
420 m->m_len += pad;
421 m1->m_pkthdr.len += pad;
422 }
423 }
424
425 /*
426 * A-MSDU's are just appended; the "I'm A-MSDU!" bit is in the
427 * QoS header.
428 *
429 * XXX optimize by prepending together
430 */
431 m->m_next = m2; /* NB: last mbuf from above */
432 m1->m_pkthdr.len += m2->m_pkthdr.len;
433 M_PREPEND(m1, sizeof(uint32_t)+2, M_NOWAIT);
434 if (m1 == NULL) { /* XXX cannot happen */
435 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
436 "%s: no space for tunnel header\n", __func__);
437 vap->iv_stats.is_tx_nobuf++;
438 return NULL;
439 }
440 memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
441
442 M_PREPEND(m1, sizeof(struct llc), M_NOWAIT);
443 if (m1 == NULL) { /* XXX cannot happen */
444 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
445 "%s: no space for llc header\n", __func__);
446 vap->iv_stats.is_tx_nobuf++;
447 return NULL;
448 }
449 llc = mtod(m1, struct llc *);
450 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
451 llc->llc_control = LLC_UI;
452 llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
453 llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
454 llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
455 llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
456
457 vap->iv_stats.is_ff_encap++;
458
459 return m1;
460 bad:
461 vap->iv_stats.is_ff_encapfail++;
462 if (m1 != NULL)
463 m_freem(m1);
464 if (m2 != NULL)
465 m_freem(m2);
466 return NULL;
467 }
468
469 /*
470 * A-MSDU encapsulation.
471 *
472 * This assumes just two frames for now, since we're borrowing the
473 * same queuing code and infrastructure as fast-frames.
474 *
475 * There must be two packets chained with m_nextpkt.
476 * We do header adjustment for each, and then concatenate the mbuf chains
477 * to form a single frame for transmission.
478 */
479 struct mbuf *
480 ieee80211_amsdu_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
481 struct ieee80211_key *key)
482 {
483 struct mbuf *m2;
484 struct ether_header eh1, eh2;
485 struct mbuf *m;
486 int pad;
487
488 m2 = m1->m_nextpkt;
489 if (m2 == NULL) {
490 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
491 "%s: only one frame\n", __func__);
492 goto bad;
493 }
494 m1->m_nextpkt = NULL;
495
496 /*
497 * Include A-MSDU header in adjusting header layout.
498 */
499 KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
500 ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
501 m1 = ieee80211_mbuf_adjust(vap,
502 hdrspace + sizeof(struct llc) + sizeof(uint32_t) +
503 sizeof(struct ether_header),
504 key, m1);
505 if (m1 == NULL) {
506 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
507 m_freem(m2);
508 goto bad;
509 }
510
511 /*
512 * Copy second frame's Ethernet header out of line
513 * and adjust for encapsulation headers. Note that
514 * we make room for padding in case there isn't room
515 * at the end of first frame.
516 */
517 KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
518 ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
519 m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
520 if (m2 == NULL) {
521 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
522 goto bad;
523 }
524
525 /*
526 * Now do tunnel encapsulation. First, each
527 * frame gets a standard encapsulation.
528 */
529 m1 = ieee80211_ff_encap1(vap, m1, &eh1);
530 if (m1 == NULL)
531 goto bad;
532 m2 = ieee80211_ff_encap1(vap, m2, &eh2);
533 if (m2 == NULL)
534 goto bad;
535
536 /*
537 * Pad leading frame to a 4-byte boundary. If there
538 * is space at the end of the first frame, put it
539 * there; otherwise prepend to the front of the second
540 * frame. We know doing the second will always work
541 * because we reserve space above. We prefer appending
542 * as this typically has better DMA alignment properties.
543 */
544 for (m = m1; m->m_next != NULL; m = m->m_next)
545 ;
546 pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
547 if (pad) {
548 if (M_TRAILINGSPACE(m) < pad) { /* prepend to second */
549 m2->m_data -= pad;
550 m2->m_len += pad;
551 m2->m_pkthdr.len += pad;
552 } else { /* append to first */
553 m->m_len += pad;
554 m1->m_pkthdr.len += pad;
555 }
556 }
557
558 /*
559 * Now, stick 'em together.
560 */
561 m->m_next = m2; /* NB: last mbuf from above */
562 m1->m_pkthdr.len += m2->m_pkthdr.len;
563
564 vap->iv_stats.is_amsdu_encap++;
565
566 return m1;
567 bad:
568 vap->iv_stats.is_amsdu_encapfail++;
569 if (m1 != NULL)
570 m_freem(m1);
571 if (m2 != NULL)
572 m_freem(m2);
573 return NULL;
574 }
575
576
577 static void
578 ff_transmit(struct ieee80211_node *ni, struct mbuf *m)
579 {
580 struct ieee80211vap *vap = ni->ni_vap;
581 struct ieee80211com *ic = ni->ni_ic;
582
583 IEEE80211_TX_LOCK_ASSERT(ic);
584
585 /* encap and xmit */
586 m = ieee80211_encap(vap, ni, m);
587 if (m != NULL)
588 (void) ieee80211_parent_xmitpkt(ic, m);
589 else
590 ieee80211_free_node(ni);
591 }
592
593 /*
594 * Flush frames to device; note we re-use the linked list
595 * the frames were stored on and use the sentinel (unchanged)
596 * which may be non-NULL.
597 */
598 static void
599 ff_flush(struct mbuf *head, struct mbuf *last)
600 {
601 struct mbuf *m, *next;
602 struct ieee80211_node *ni;
603 struct ieee80211vap *vap;
604
605 for (m = head; m != last; m = next) {
606 next = m->m_nextpkt;
607 m->m_nextpkt = NULL;
608
609 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
610 vap = ni->ni_vap;
611
612 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
613 "%s: flush frame, age %u", __func__, M_AGE_GET(m));
614 vap->iv_stats.is_ff_flush++;
615
616 ff_transmit(ni, m);
617 }
618 }
619
620 /*
621 * Age frames on the staging queue.
622 */
623 void
624 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq,
625 int quanta)
626 {
627 struct mbuf *m, *head;
628 struct ieee80211_node *ni;
629
630 IEEE80211_FF_LOCK(ic);
631 if (sq->depth == 0) {
632 IEEE80211_FF_UNLOCK(ic);
633 return; /* nothing to do */
634 }
635
636 KASSERT(sq->head != NULL, ("stageq empty"));
637
638 head = sq->head;
639 while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) {
640 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
641
642 /* clear staging ref to frame */
643 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
644 KASSERT(ni->ni_tx_superg[tid] == m, ("staging queue empty"));
645 ni->ni_tx_superg[tid] = NULL;
646
647 sq->head = m->m_nextpkt;
648 sq->depth--;
649 }
650 if (m == NULL)
651 sq->tail = NULL;
652 else
653 M_AGE_SUB(m, quanta);
654 IEEE80211_FF_UNLOCK(ic);
655
656 IEEE80211_TX_LOCK(ic);
657 ff_flush(head, m);
658 IEEE80211_TX_UNLOCK(ic);
659 }
660
661 static void
662 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m)
663 {
664 int age = ieee80211_ffagemax;
665
666 IEEE80211_FF_LOCK_ASSERT(ic);
667
668 if (sq->tail != NULL) {
669 sq->tail->m_nextpkt = m;
670 age -= M_AGE_GET(sq->head);
671 } else
672 sq->head = m;
673 KASSERT(age >= 0, ("age %d", age));
674 M_AGE_SET(m, age);
675 m->m_nextpkt = NULL;
676 sq->tail = m;
677 sq->depth++;
678 }
679
680 static void
681 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged)
682 {
683 struct mbuf *m, *mprev;
684
685 IEEE80211_FF_LOCK_ASSERT(ic);
686
687 mprev = NULL;
688 for (m = sq->head; m != NULL; m = m->m_nextpkt) {
689 if (m == mstaged) {
690 if (mprev == NULL)
691 sq->head = m->m_nextpkt;
692 else
693 mprev->m_nextpkt = m->m_nextpkt;
694 if (sq->tail == m)
695 sq->tail = mprev;
696 sq->depth--;
697 return;
698 }
699 mprev = m;
700 }
701 printf("%s: packet not found\n", __func__);
702 }
703
704 static uint32_t
705 ff_approx_txtime(struct ieee80211_node *ni,
706 const struct mbuf *m1, const struct mbuf *m2)
707 {
708 struct ieee80211com *ic = ni->ni_ic;
709 struct ieee80211vap *vap = ni->ni_vap;
710 uint32_t framelen;
711 uint32_t frame_time;
712
713 /*
714 * Approximate the frame length to be transmitted. A swag to add
715 * the following maximal values to the skb payload:
716 * - 32: 802.11 encap + CRC
717 * - 24: encryption overhead (if wep bit)
718 * - 4 + 6: fast-frame header and padding
719 * - 16: 2 LLC FF tunnel headers
720 * - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd)
721 */
722 framelen = m1->m_pkthdr.len + 32 +
723 ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR;
724 if (vap->iv_flags & IEEE80211_F_PRIVACY)
725 framelen += 24;
726 if (m2 != NULL)
727 framelen += m2->m_pkthdr.len;
728
729 /*
730 * For now, we assume non-shortgi, 20MHz, just because I want to
731 * at least test 802.11n.
732 */
733 if (ni->ni_txrate & IEEE80211_RATE_MCS)
734 frame_time = ieee80211_compute_duration_ht(framelen,
735 ni->ni_txrate,
736 IEEE80211_HT_RC_2_STREAMS(ni->ni_txrate),
737 0, /* isht40 */
738 0); /* isshortgi */
739 else
740 frame_time = ieee80211_compute_duration(ic->ic_rt, framelen,
741 ni->ni_txrate, 0);
742 return (frame_time);
743 }
744
745 /*
746 * Check if the supplied frame can be partnered with an existing
747 * or pending frame. Return a reference to any frame that should be
748 * sent on return; otherwise return NULL.
749 */
750 struct mbuf *
751 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m)
752 {
753 struct ieee80211vap *vap = ni->ni_vap;
754 struct ieee80211com *ic = ni->ni_ic;
755 struct ieee80211_superg *sg = ic->ic_superg;
756 const int pri = M_WME_GETAC(m);
757 struct ieee80211_stageq *sq;
758 struct ieee80211_tx_ampdu *tap;
759 struct mbuf *mstaged;
760 uint32_t txtime, limit;
761
762 IEEE80211_TX_UNLOCK_ASSERT(ic);
763
764 IEEE80211_LOCK(ic);
765 limit = IEEE80211_TXOP_TO_US(
766 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit);
767 IEEE80211_UNLOCK(ic);
768
769 /*
770 * Check if the supplied frame can be aggregated.
771 *
772 * NB: we allow EAPOL frames to be aggregated with other ucast traffic.
773 * Do 802.1x EAPOL frames proceed in the clear? Then they couldn't
774 * be aggregated with other types of frames when encryption is on?
775 */
776 IEEE80211_FF_LOCK(ic);
777 tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)];
778 mstaged = ni->ni_tx_superg[WME_AC_TO_TID(pri)];
779 /* XXX NOTE: reusing packet counter state from A-MPDU */
780 /*
781 * XXX NOTE: this means we're double-counting; it should just
782 * be done in ieee80211_output.c once for both superg and A-MPDU.
783 */
784 ieee80211_txampdu_count_packet(tap);
785
786 /*
787 * When not in station mode never aggregate a multicast
788 * frame; this insures, for example, that a combined frame
789 * does not require multiple encryption keys.
790 */
791 if (vap->iv_opmode != IEEE80211_M_STA &&
792 ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) {
793 /* XXX flush staged frame? */
794 IEEE80211_FF_UNLOCK(ic);
795 return m;
796 }
797 /*
798 * If there is no frame to combine with and the pps is
799 * too low; then do not attempt to aggregate this frame.
800 */
801 if (mstaged == NULL &&
802 ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) {
803 IEEE80211_FF_UNLOCK(ic);
804 return m;
805 }
806 sq = &sg->ff_stageq[pri];
807 /*
808 * Check the txop limit to insure the aggregate fits.
809 */
810 if (limit != 0 &&
811 (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) {
812 /*
813 * Aggregate too long, return to the caller for direct
814 * transmission. In addition, flush any pending frame
815 * before sending this one.
816 */
817 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
818 "%s: txtime %u exceeds txop limit %u\n",
819 __func__, txtime, limit);
820
821 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
822 if (mstaged != NULL)
823 stageq_remove(ic, sq, mstaged);
824 IEEE80211_FF_UNLOCK(ic);
825
826 if (mstaged != NULL) {
827 IEEE80211_TX_LOCK(ic);
828 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
829 "%s: flush staged frame", __func__);
830 /* encap and xmit */
831 ff_transmit(ni, mstaged);
832 IEEE80211_TX_UNLOCK(ic);
833 }
834 return m; /* NB: original frame */
835 }
836 /*
837 * An aggregation candidate. If there's a frame to partner
838 * with then combine and return for processing. Otherwise
839 * save this frame and wait for a partner to show up (or
840 * the frame to be flushed). Note that staged frames also
841 * hold their node reference.
842 */
843 if (mstaged != NULL) {
844 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
845 stageq_remove(ic, sq, mstaged);
846 IEEE80211_FF_UNLOCK(ic);
847
848 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
849 "%s: aggregate fast-frame", __func__);
850 /*
851 * Release the node reference; we only need
852 * the one already in mstaged.
853 */
854 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni,
855 ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni));
856 ieee80211_free_node(ni);
857
858 m->m_nextpkt = NULL;
859 mstaged->m_nextpkt = m;
860 mstaged->m_flags |= M_FF; /* NB: mark for encap work */
861 } else {
862 KASSERT(ni->ni_tx_superg[WME_AC_TO_TID(pri)] == NULL,
863 ("ni_tx_superg[]: %p",
864 ni->ni_tx_superg[WME_AC_TO_TID(pri)]));
865 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = m;
866
867 stageq_add(ic, sq, m);
868 IEEE80211_FF_UNLOCK(ic);
869
870 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
871 "%s: stage frame, %u queued", __func__, sq->depth);
872 /* NB: mstaged is NULL */
873 }
874 return mstaged;
875 }
876
877 struct mbuf *
878 ieee80211_amsdu_check(struct ieee80211_node *ni, struct mbuf *m)
879 {
880 /*
881 * XXX TODO: actually enforce the node support
882 * and HTCAP requirements for the maximum A-MSDU
883 * size.
884 */
885
886 /* First: software A-MSDU transmit? */
887 if (! ieee80211_amsdu_tx_ok(ni))
888 return (m);
889
890 /* Next - EAPOL? Nope, don't aggregate; we don't QoS encap them */
891 if (m->m_flags & (M_EAPOL | M_MCAST | M_BCAST))
892 return (m);
893
894 /* Next - needs to be a data frame, non-broadcast, etc */
895 if (ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost))
896 return (m);
897
898 return (ieee80211_ff_check(ni, m));
899 }
900
901 void
902 ieee80211_ff_node_init(struct ieee80211_node *ni)
903 {
904 /*
905 * Clean FF state on re-associate. This handles the case
906 * where a station leaves w/o notifying us and then returns
907 * before node is reaped for inactivity.
908 */
909 ieee80211_ff_node_cleanup(ni);
910 }
911
912 /*
913 * Note: this comlock acquisition LORs with the node lock:
914 *
915 * 1: sta_join1 -> NODE_LOCK -> node_free -> node_cleanup -> ff_node_cleanup -> COM_LOCK
916 * 2: TBD
917 */
918 void
919 ieee80211_ff_node_cleanup(struct ieee80211_node *ni)
920 {
921 struct ieee80211com *ic = ni->ni_ic;
922 struct ieee80211_superg *sg = ic->ic_superg;
923 struct mbuf *m, *next_m, *head;
924 int tid;
925
926 IEEE80211_FF_LOCK(ic);
927 head = NULL;
928 for (tid = 0; tid < WME_NUM_TID; tid++) {
929 int ac = TID_TO_WME_AC(tid);
930 /*
931 * XXX Initialise the packet counter.
932 *
933 * This may be double-work for 11n stations;
934 * but without it we never setup things.
935 */
936 ieee80211_txampdu_init_pps(&ni->ni_tx_ampdu[tid]);
937 m = ni->ni_tx_superg[tid];
938 if (m != NULL) {
939 ni->ni_tx_superg[tid] = NULL;
940 stageq_remove(ic, &sg->ff_stageq[ac], m);
941 m->m_nextpkt = head;
942 head = m;
943 }
944 }
945 IEEE80211_FF_UNLOCK(ic);
946
947 /*
948 * Free mbufs, taking care to not dereference the mbuf after
949 * we free it (hence grabbing m_nextpkt before we free it.)
950 */
951 m = head;
952 while (m != NULL) {
953 next_m = m->m_nextpkt;
954 m_freem(m);
955 ieee80211_free_node(ni);
956 m = next_m;
957 }
958 }
959
960 /*
961 * Switch between turbo and non-turbo operating modes.
962 * Use the specified channel flags to locate the new
963 * channel, update 802.11 state, and then call back into
964 * the driver to effect the change.
965 */
966 void
967 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
968 {
969 struct ieee80211com *ic = vap->iv_ic;
970 struct ieee80211_channel *chan;
971
972 chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
973 if (chan == NULL) { /* XXX should not happen */
974 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
975 "%s: no channel with freq %u flags 0x%x\n",
976 __func__, ic->ic_bsschan->ic_freq, newflags);
977 return;
978 }
979
980 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
981 "%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
982 ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
983 ieee80211_phymode_name[ieee80211_chan2mode(chan)],
984 chan->ic_freq, chan->ic_flags);
985
986 ic->ic_bsschan = chan;
987 ic->ic_prevchan = ic->ic_curchan;
988 ic->ic_curchan = chan;
989 ic->ic_rt = ieee80211_get_ratetable(chan);
990 ic->ic_set_channel(ic);
991 ieee80211_radiotap_chan_change(ic);
992 /* NB: do not need to reset ERP state 'cuz we're in sta mode */
993 }
994
995 /*
996 * Return the current ``state'' of an Atheros capbility.
997 * If associated in station mode report the negotiated
998 * setting. Otherwise report the current setting.
999 */
1000 static int
1001 getathcap(struct ieee80211vap *vap, int cap)
1002 {
1003 if (vap->iv_opmode == IEEE80211_M_STA &&
1004 vap->iv_state == IEEE80211_S_RUN)
1005 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
1006 else
1007 return (vap->iv_flags & cap) != 0;
1008 }
1009
1010 static int
1011 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1012 {
1013 switch (ireq->i_type) {
1014 case IEEE80211_IOC_FF:
1015 ireq->i_val = getathcap(vap, IEEE80211_F_FF);
1016 break;
1017 case IEEE80211_IOC_TURBOP:
1018 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
1019 break;
1020 default:
1021 return ENOSYS;
1022 }
1023 return 0;
1024 }
1025 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
1026
1027 static int
1028 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1029 {
1030 switch (ireq->i_type) {
1031 case IEEE80211_IOC_FF:
1032 if (ireq->i_val) {
1033 if ((vap->iv_caps & IEEE80211_C_FF) == 0)
1034 return EOPNOTSUPP;
1035 vap->iv_flags |= IEEE80211_F_FF;
1036 } else
1037 vap->iv_flags &= ~IEEE80211_F_FF;
1038 return ENETRESET;
1039 case IEEE80211_IOC_TURBOP:
1040 if (ireq->i_val) {
1041 if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
1042 return EOPNOTSUPP;
1043 vap->iv_flags |= IEEE80211_F_TURBOP;
1044 } else
1045 vap->iv_flags &= ~IEEE80211_F_TURBOP;
1046 return ENETRESET;
1047 default:
1048 return ENOSYS;
1049 }
1050 }
1051 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);
1052
1053 #endif /* IEEE80211_SUPPORT_SUPERG */
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