270 (m->m_flags & M_EAPOL) == 0) {
271 const int ac = M_WME_GETAC(m);
272 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac];
273
274 ieee80211_txampdu_count_packet(tap);
275 if (IEEE80211_AMPDU_RUNNING(tap)) {
276 /*
277 * Operational, mark frame for aggregation.
278 *
279 * XXX do tx aggregation here
280 */
281 m->m_flags |= M_AMPDU_MPDU;
282 } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
283 ic->ic_ampdu_enable(ni, tap)) {
284 /*
285 * Not negotiated yet, request service.
286 */
287 ieee80211_ampdu_request(ni, tap);
288 /* XXX hold frame for reply? */
289 }
290 }
291#ifdef IEEE80211_SUPPORT_SUPERG
292 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) {
293 m = ieee80211_ff_check(ni, m);
294 if (m == NULL) {
295 /* NB: any ni ref held on stageq */
296 continue;
297 }
298 }
299#endif /* IEEE80211_SUPPORT_SUPERG */
300 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
301 /*
302 * Encapsulate the packet in prep for transmission.
303 */
304 m = ieee80211_encap(vap, ni, m);
305 if (m == NULL) {
306 /* NB: stat+msg handled in ieee80211_encap */
307 ieee80211_free_node(ni);
308 continue;
309 }
310 }
311
312 error = parent->if_transmit(parent, m);
313 if (error != 0) {
314 /* NB: IFQ_HANDOFF reclaims mbuf */
315 ieee80211_free_node(ni);
316 } else {
317 ifp->if_opackets++;
318 }
319 ic->ic_lastdata = ticks;
320 }
321#undef IS_DWDS
322}
323
324/*
325 * 802.11 output routine. This is (currently) used only to
326 * connect bpf write calls to the 802.11 layer for injecting
327 * raw 802.11 frames.
328 */
329int
330ieee80211_output(struct ifnet *ifp, struct mbuf *m,
331 struct sockaddr *dst, struct route *ro)
332{
333#define senderr(e) do { error = (e); goto bad;} while (0)
334 struct ieee80211_node *ni = NULL;
335 struct ieee80211vap *vap;
336 struct ieee80211_frame *wh;
337 int error;
338
339 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
340 /*
341 * Short-circuit requests if the vap is marked OACTIVE
342 * as this is used when tearing down state to indicate
343 * the vap may be gone. This can also happen because a
344 * packet came down through ieee80211_start before the
345 * vap entered RUN state in which case it's also ok to
346 * just drop the frame. This should not be necessary
347 * but callers of if_output don't check OACTIVE.
348 */
349 senderr(ENETDOWN);
350 }
351 vap = ifp->if_softc;
352 /*
353 * Hand to the 802.3 code if not tagged as
354 * a raw 802.11 frame.
355 */
356 if (dst->sa_family != AF_IEEE80211)
357 return vap->iv_output(ifp, m, dst, ro);
358#ifdef MAC
359 error = mac_ifnet_check_transmit(ifp, m);
360 if (error)
361 senderr(error);
362#endif
363 if (ifp->if_flags & IFF_MONITOR)
364 senderr(ENETDOWN);
365 if (!IFNET_IS_UP_RUNNING(ifp))
366 senderr(ENETDOWN);
367 if (vap->iv_state == IEEE80211_S_CAC) {
368 IEEE80211_DPRINTF(vap,
369 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
370 "block %s frame in CAC state\n", "raw data");
371 vap->iv_stats.is_tx_badstate++;
372 senderr(EIO); /* XXX */
373 }
374 /* XXX bypass bridge, pfil, carp, etc. */
375
376 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
377 senderr(EIO); /* XXX */
378 wh = mtod(m, struct ieee80211_frame *);
379 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
380 IEEE80211_FC0_VERSION_0)
381 senderr(EIO); /* XXX */
382
383 /* locate destination node */
384 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
385 case IEEE80211_FC1_DIR_NODS:
386 case IEEE80211_FC1_DIR_FROMDS:
387 ni = ieee80211_find_txnode(vap, wh->i_addr1);
388 break;
389 case IEEE80211_FC1_DIR_TODS:
390 case IEEE80211_FC1_DIR_DSTODS:
391 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame))
392 senderr(EIO); /* XXX */
393 ni = ieee80211_find_txnode(vap, wh->i_addr3);
394 break;
395 default:
396 senderr(EIO); /* XXX */
397 }
398 if (ni == NULL) {
399 /*
400 * Permit packets w/ bpf params through regardless
401 * (see below about sa_len).
402 */
403 if (dst->sa_len == 0)
404 senderr(EHOSTUNREACH);
405 ni = ieee80211_ref_node(vap->iv_bss);
406 }
407
408 /*
409 * Sanitize mbuf for net80211 flags leaked from above.
410 *
411 * NB: This must be done before ieee80211_classify as
412 * it marks EAPOL in frames with M_EAPOL.
413 */
414 m->m_flags &= ~M_80211_TX;
415
416 /* calculate priority so drivers can find the tx queue */
417 /* XXX assumes an 802.3 frame */
418 if (ieee80211_classify(ni, m))
419 senderr(EIO); /* XXX */
420
421 IEEE80211_NODE_STAT(ni, tx_data);
422 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
423 IEEE80211_NODE_STAT(ni, tx_mcast);
424 m->m_flags |= M_MCAST;
425 } else
426 IEEE80211_NODE_STAT(ni, tx_ucast);
427 /* NB: ieee80211_encap does not include 802.11 header */
428 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
429
430 /*
431 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
432 * present by setting the sa_len field of the sockaddr (yes,
433 * this is a hack).
434 * NB: we assume sa_data is suitably aligned to cast.
435 */
436 return vap->iv_ic->ic_raw_xmit(ni, m,
437 (const struct ieee80211_bpf_params *)(dst->sa_len ?
438 dst->sa_data : NULL));
439bad:
440 if (m != NULL)
441 m_freem(m);
442 if (ni != NULL)
443 ieee80211_free_node(ni);
444 return error;
445#undef senderr
446}
447
448/*
449 * Set the direction field and address fields of an outgoing
450 * frame. Note this should be called early on in constructing
451 * a frame as it sets i_fc[1]; other bits can then be or'd in.
452 */
453static void
454ieee80211_send_setup(
455 struct ieee80211_node *ni,
456 struct mbuf *m,
457 int type, int tid,
458 const uint8_t sa[IEEE80211_ADDR_LEN],
459 const uint8_t da[IEEE80211_ADDR_LEN],
460 const uint8_t bssid[IEEE80211_ADDR_LEN])
461{
462#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
463 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
464 ieee80211_seq seqno;
465
466 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
467 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
468 struct ieee80211vap *vap = ni->ni_vap;
469
470 switch (vap->iv_opmode) {
471 case IEEE80211_M_STA:
472 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
473 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
474 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
475 IEEE80211_ADDR_COPY(wh->i_addr3, da);
476 break;
477 case IEEE80211_M_IBSS:
478 case IEEE80211_M_AHDEMO:
479 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
480 IEEE80211_ADDR_COPY(wh->i_addr1, da);
481 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
482 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
483 break;
484 case IEEE80211_M_HOSTAP:
485 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
486 IEEE80211_ADDR_COPY(wh->i_addr1, da);
487 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
488 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
489 break;
490 case IEEE80211_M_WDS:
491 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
492 IEEE80211_ADDR_COPY(wh->i_addr1, da);
493 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
494 IEEE80211_ADDR_COPY(wh->i_addr3, da);
495 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
496 break;
497 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
498 break;
499 }
500 } else {
501 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
502 IEEE80211_ADDR_COPY(wh->i_addr1, da);
503 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
504 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
505 }
506 *(uint16_t *)&wh->i_dur[0] = 0;
507
508 seqno = ni->ni_txseqs[tid]++;
509 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
510 M_SEQNO_SET(m, seqno);
511
512 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
513 m->m_flags |= M_MCAST;
514#undef WH4
515}
516
517/*
518 * Send a management frame to the specified node. The node pointer
519 * must have a reference as the pointer will be passed to the driver
520 * and potentially held for a long time. If the frame is successfully
521 * dispatched to the driver, then it is responsible for freeing the
522 * reference (and potentially free'ing up any associated storage);
523 * otherwise deal with reclaiming any reference (on error).
524 */
525int
526ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
527 struct ieee80211_bpf_params *params)
528{
529 struct ieee80211vap *vap = ni->ni_vap;
530 struct ieee80211com *ic = ni->ni_ic;
531 struct ieee80211_frame *wh;
532
533 KASSERT(ni != NULL, ("null node"));
534
535 if (vap->iv_state == IEEE80211_S_CAC) {
536 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
537 ni, "block %s frame in CAC state",
538 ieee80211_mgt_subtype_name[
539 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
540 IEEE80211_FC0_SUBTYPE_SHIFT]);
541 vap->iv_stats.is_tx_badstate++;
542 ieee80211_free_node(ni);
543 m_freem(m);
544 return EIO; /* XXX */
545 }
546
547 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
548 if (m == NULL) {
549 ieee80211_free_node(ni);
550 return ENOMEM;
551 }
552
553 wh = mtod(m, struct ieee80211_frame *);
554 ieee80211_send_setup(ni, m,
555 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
556 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
557 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
558 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
559 "encrypting frame (%s)", __func__);
560 wh->i_fc[1] |= IEEE80211_FC1_WEP;
561 }
562 m->m_flags |= M_ENCAP; /* mark encapsulated */
563
564 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
565 M_WME_SETAC(m, params->ibp_pri);
566
567#ifdef IEEE80211_DEBUG
568 /* avoid printing too many frames */
569 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
570 ieee80211_msg_dumppkts(vap)) {
571 printf("[%s] send %s on channel %u\n",
572 ether_sprintf(wh->i_addr1),
573 ieee80211_mgt_subtype_name[
574 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
575 IEEE80211_FC0_SUBTYPE_SHIFT],
576 ieee80211_chan2ieee(ic, ic->ic_curchan));
577 }
578#endif
579 IEEE80211_NODE_STAT(ni, tx_mgmt);
580
581 return ic->ic_raw_xmit(ni, m, params);
582}
583
584/*
585 * Send a null data frame to the specified node. If the station
586 * is setup for QoS then a QoS Null Data frame is constructed.
587 * If this is a WDS station then a 4-address frame is constructed.
588 *
589 * NB: the caller is assumed to have setup a node reference
590 * for use; this is necessary to deal with a race condition
591 * when probing for inactive stations. Like ieee80211_mgmt_output
592 * we must cleanup any node reference on error; however we
593 * can safely just unref it as we know it will never be the
594 * last reference to the node.
595 */
596int
597ieee80211_send_nulldata(struct ieee80211_node *ni)
598{
599 struct ieee80211vap *vap = ni->ni_vap;
600 struct ieee80211com *ic = ni->ni_ic;
601 struct mbuf *m;
602 struct ieee80211_frame *wh;
603 int hdrlen;
604 uint8_t *frm;
605
606 if (vap->iv_state == IEEE80211_S_CAC) {
607 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
608 ni, "block %s frame in CAC state", "null data");
609 ieee80211_unref_node(&ni);
610 vap->iv_stats.is_tx_badstate++;
611 return EIO; /* XXX */
612 }
613
614 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
615 hdrlen = sizeof(struct ieee80211_qosframe);
616 else
617 hdrlen = sizeof(struct ieee80211_frame);
618 /* NB: only WDS vap's get 4-address frames */
619 if (vap->iv_opmode == IEEE80211_M_WDS)
620 hdrlen += IEEE80211_ADDR_LEN;
621 if (ic->ic_flags & IEEE80211_F_DATAPAD)
622 hdrlen = roundup(hdrlen, sizeof(uint32_t));
623
624 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
625 if (m == NULL) {
626 /* XXX debug msg */
627 ieee80211_unref_node(&ni);
628 vap->iv_stats.is_tx_nobuf++;
629 return ENOMEM;
630 }
631 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
632 ("leading space %zd", M_LEADINGSPACE(m)));
633 M_PREPEND(m, hdrlen, M_DONTWAIT);
634 if (m == NULL) {
635 /* NB: cannot happen */
636 ieee80211_free_node(ni);
637 return ENOMEM;
638 }
639
640 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
641 if (ni->ni_flags & IEEE80211_NODE_QOS) {
642 const int tid = WME_AC_TO_TID(WME_AC_BE);
643 uint8_t *qos;
644
645 ieee80211_send_setup(ni, m,
646 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
647 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
648
649 if (vap->iv_opmode == IEEE80211_M_WDS)
650 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
651 else
652 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
653 qos[0] = tid & IEEE80211_QOS_TID;
654 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
655 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
656 qos[1] = 0;
657 } else {
658 ieee80211_send_setup(ni, m,
659 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
660 IEEE80211_NONQOS_TID,
661 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
662 }
663 if (vap->iv_opmode != IEEE80211_M_WDS) {
664 /* NB: power management bit is never sent by an AP */
665 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
666 vap->iv_opmode != IEEE80211_M_HOSTAP)
667 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
668 }
669 m->m_len = m->m_pkthdr.len = hdrlen;
670 m->m_flags |= M_ENCAP; /* mark encapsulated */
671
672 M_WME_SETAC(m, WME_AC_BE);
673
674 IEEE80211_NODE_STAT(ni, tx_data);
675
676 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
677 "send %snull data frame on channel %u, pwr mgt %s",
678 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
679 ieee80211_chan2ieee(ic, ic->ic_curchan),
680 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
681
682 return ic->ic_raw_xmit(ni, m, NULL);
683}
684
685/*
686 * Assign priority to a frame based on any vlan tag assigned
687 * to the station and/or any Diffserv setting in an IP header.
688 * Finally, if an ACM policy is setup (in station mode) it's
689 * applied.
690 */
691int
692ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
693{
694 const struct ether_header *eh = mtod(m, struct ether_header *);
695 int v_wme_ac, d_wme_ac, ac;
696
697 /*
698 * Always promote PAE/EAPOL frames to high priority.
699 */
700 if (eh->ether_type == htons(ETHERTYPE_PAE)) {
701 /* NB: mark so others don't need to check header */
702 m->m_flags |= M_EAPOL;
703 ac = WME_AC_VO;
704 goto done;
705 }
706 /*
707 * Non-qos traffic goes to BE.
708 */
709 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
710 ac = WME_AC_BE;
711 goto done;
712 }
713
714 /*
715 * If node has a vlan tag then all traffic
716 * to it must have a matching tag.
717 */
718 v_wme_ac = 0;
719 if (ni->ni_vlan != 0) {
720 if ((m->m_flags & M_VLANTAG) == 0) {
721 IEEE80211_NODE_STAT(ni, tx_novlantag);
722 return 1;
723 }
724 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
725 EVL_VLANOFTAG(ni->ni_vlan)) {
726 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
727 return 1;
728 }
729 /* map vlan priority to AC */
730 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
731 }
732
733#ifdef INET
734 if (eh->ether_type == htons(ETHERTYPE_IP)) {
735 uint8_t tos;
736 /*
737 * IP frame, map the DSCP bits from the TOS field.
738 */
739 /* XXX m_copydata may be too slow for fast path */
740 /* NB: ip header may not be in first mbuf */
741 m_copydata(m, sizeof(struct ether_header) +
742 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
743 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
744 d_wme_ac = TID_TO_WME_AC(tos);
745 } else {
746#endif /* INET */
747 d_wme_ac = WME_AC_BE;
748#ifdef INET
749 }
750#endif
751 /*
752 * Use highest priority AC.
753 */
754 if (v_wme_ac > d_wme_ac)
755 ac = v_wme_ac;
756 else
757 ac = d_wme_ac;
758
759 /*
760 * Apply ACM policy.
761 */
762 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
763 static const int acmap[4] = {
764 WME_AC_BK, /* WME_AC_BE */
765 WME_AC_BK, /* WME_AC_BK */
766 WME_AC_BE, /* WME_AC_VI */
767 WME_AC_VI, /* WME_AC_VO */
768 };
769 struct ieee80211com *ic = ni->ni_ic;
770
771 while (ac != WME_AC_BK &&
772 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
773 ac = acmap[ac];
774 }
775done:
776 M_WME_SETAC(m, ac);
777 return 0;
778}
779
780/*
781 * Insure there is sufficient contiguous space to encapsulate the
782 * 802.11 data frame. If room isn't already there, arrange for it.
783 * Drivers and cipher modules assume we have done the necessary work
784 * and fail rudely if they don't find the space they need.
785 */
786struct mbuf *
787ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
788 struct ieee80211_key *key, struct mbuf *m)
789{
790#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
791 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
792
793 if (key != NULL) {
794 /* XXX belongs in crypto code? */
795 needed_space += key->wk_cipher->ic_header;
796 /* XXX frags */
797 /*
798 * When crypto is being done in the host we must insure
799 * the data are writable for the cipher routines; clone
800 * a writable mbuf chain.
801 * XXX handle SWMIC specially
802 */
803 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
804 m = m_unshare(m, M_NOWAIT);
805 if (m == NULL) {
806 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
807 "%s: cannot get writable mbuf\n", __func__);
808 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
809 return NULL;
810 }
811 }
812 }
813 /*
814 * We know we are called just before stripping an Ethernet
815 * header and prepending an LLC header. This means we know
816 * there will be
817 * sizeof(struct ether_header) - sizeof(struct llc)
818 * bytes recovered to which we need additional space for the
819 * 802.11 header and any crypto header.
820 */
821 /* XXX check trailing space and copy instead? */
822 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
823 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
824 if (n == NULL) {
825 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
826 "%s: cannot expand storage\n", __func__);
827 vap->iv_stats.is_tx_nobuf++;
828 m_freem(m);
829 return NULL;
830 }
831 KASSERT(needed_space <= MHLEN,
832 ("not enough room, need %u got %zu\n", needed_space, MHLEN));
833 /*
834 * Setup new mbuf to have leading space to prepend the
835 * 802.11 header and any crypto header bits that are
836 * required (the latter are added when the driver calls
837 * back to ieee80211_crypto_encap to do crypto encapsulation).
838 */
839 /* NB: must be first 'cuz it clobbers m_data */
840 m_move_pkthdr(n, m);
841 n->m_len = 0; /* NB: m_gethdr does not set */
842 n->m_data += needed_space;
843 /*
844 * Pull up Ethernet header to create the expected layout.
845 * We could use m_pullup but that's overkill (i.e. we don't
846 * need the actual data) and it cannot fail so do it inline
847 * for speed.
848 */
849 /* NB: struct ether_header is known to be contiguous */
850 n->m_len += sizeof(struct ether_header);
851 m->m_len -= sizeof(struct ether_header);
852 m->m_data += sizeof(struct ether_header);
853 /*
854 * Replace the head of the chain.
855 */
856 n->m_next = m;
857 m = n;
858 }
859 return m;
860#undef TO_BE_RECLAIMED
861}
862
863/*
864 * Return the transmit key to use in sending a unicast frame.
865 * If a unicast key is set we use that. When no unicast key is set
866 * we fall back to the default transmit key.
867 */
868static __inline struct ieee80211_key *
869ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
870 struct ieee80211_node *ni)
871{
872 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
873 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
874 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
875 return NULL;
876 return &vap->iv_nw_keys[vap->iv_def_txkey];
877 } else {
878 return &ni->ni_ucastkey;
879 }
880}
881
882/*
883 * Return the transmit key to use in sending a multicast frame.
884 * Multicast traffic always uses the group key which is installed as
885 * the default tx key.
886 */
887static __inline struct ieee80211_key *
888ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
889 struct ieee80211_node *ni)
890{
891 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
892 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
893 return NULL;
894 return &vap->iv_nw_keys[vap->iv_def_txkey];
895}
896
897/*
898 * Encapsulate an outbound data frame. The mbuf chain is updated.
899 * If an error is encountered NULL is returned. The caller is required
900 * to provide a node reference and pullup the ethernet header in the
901 * first mbuf.
902 *
903 * NB: Packet is assumed to be processed by ieee80211_classify which
904 * marked EAPOL frames w/ M_EAPOL.
905 */
906struct mbuf *
907ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
908 struct mbuf *m)
909{
910#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
911 struct ieee80211com *ic = ni->ni_ic;
912 struct ether_header eh;
913 struct ieee80211_frame *wh;
914 struct ieee80211_key *key;
915 struct llc *llc;
916 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
917 ieee80211_seq seqno;
918
919 /*
920 * Copy existing Ethernet header to a safe place. The
921 * rest of the code assumes it's ok to strip it when
922 * reorganizing state for the final encapsulation.
923 */
924 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
925 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
926
927 /*
928 * Insure space for additional headers. First identify
929 * transmit key to use in calculating any buffer adjustments
930 * required. This is also used below to do privacy
931 * encapsulation work. Then calculate the 802.11 header
932 * size and any padding required by the driver.
933 *
934 * Note key may be NULL if we fall back to the default
935 * transmit key and that is not set. In that case the
936 * buffer may not be expanded as needed by the cipher
937 * routines, but they will/should discard it.
938 */
939 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
940 if (vap->iv_opmode == IEEE80211_M_STA ||
941 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
942 (vap->iv_opmode == IEEE80211_M_WDS &&
943 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
944 key = ieee80211_crypto_getucastkey(vap, ni);
945 else
946 key = ieee80211_crypto_getmcastkey(vap, ni);
947 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
948 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
949 eh.ether_dhost,
950 "no default transmit key (%s) deftxkey %u",
951 __func__, vap->iv_def_txkey);
952 vap->iv_stats.is_tx_nodefkey++;
953 goto bad;
954 }
955 } else
956 key = NULL;
957 /*
958 * XXX Some ap's don't handle QoS-encapsulated EAPOL
959 * frames so suppress use. This may be an issue if other
960 * ap's require all data frames to be QoS-encapsulated
961 * once negotiated in which case we'll need to make this
962 * configurable.
963 */
964 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) &&
965 (m->m_flags & M_EAPOL) == 0;
966 if (addqos)
967 hdrsize = sizeof(struct ieee80211_qosframe);
968 else
969 hdrsize = sizeof(struct ieee80211_frame);
970 /*
971 * 4-address frames need to be generated for:
972 * o packets sent through a WDS vap (IEEE80211_M_WDS)
973 * o packets sent through a vap marked for relaying
974 * (e.g. a station operating with dynamic WDS)
975 */
976 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
977 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
978 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
979 if (is4addr)
980 hdrsize += IEEE80211_ADDR_LEN;
981 /*
982 * Honor driver DATAPAD requirement.
983 */
984 if (ic->ic_flags & IEEE80211_F_DATAPAD)
985 hdrspace = roundup(hdrsize, sizeof(uint32_t));
986 else
987 hdrspace = hdrsize;
988
989 if (__predict_true((m->m_flags & M_FF) == 0)) {
990 /*
991 * Normal frame.
992 */
993 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m);
994 if (m == NULL) {
995 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
996 goto bad;
997 }
998 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
999 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1000 llc = mtod(m, struct llc *);
1001 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1002 llc->llc_control = LLC_UI;
1003 llc->llc_snap.org_code[0] = 0;
1004 llc->llc_snap.org_code[1] = 0;
1005 llc->llc_snap.org_code[2] = 0;
1006 llc->llc_snap.ether_type = eh.ether_type;
1007 } else {
1008#ifdef IEEE80211_SUPPORT_SUPERG
1009 /*
1010 * Aggregated frame.
1011 */
1012 m = ieee80211_ff_encap(vap, m, hdrspace, key);
1013 if (m == NULL)
1014#endif
1015 goto bad;
1016 }
1017 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1018
1019 M_PREPEND(m, hdrspace, M_DONTWAIT);
1020 if (m == NULL) {
1021 vap->iv_stats.is_tx_nobuf++;
1022 goto bad;
1023 }
1024 wh = mtod(m, struct ieee80211_frame *);
1025 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1026 *(uint16_t *)wh->i_dur = 0;
1027 if (is4addr) {
1028 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1029 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1030 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1031 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1032 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1033 } else switch (vap->iv_opmode) {
1034 case IEEE80211_M_STA:
1035 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1036 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1037 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1038 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1039 break;
1040 case IEEE80211_M_IBSS:
1041 case IEEE80211_M_AHDEMO:
1042 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1043 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1044 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1045 /*
1046 * NB: always use the bssid from iv_bss as the
1047 * neighbor's may be stale after an ibss merge
1048 */
1049 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1050 break;
1051 case IEEE80211_M_HOSTAP:
1052 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1053 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1054 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1055 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1056 break;
1057 case IEEE80211_M_MONITOR:
1058 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1059 goto bad;
1060 }
1061 if (m->m_flags & M_MORE_DATA)
1062 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1063 if (addqos) {
1064 uint8_t *qos;
1065 int ac, tid;
1066
1067 if (is4addr) {
1068 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1069 } else
1070 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1071 ac = M_WME_GETAC(m);
1072 /* map from access class/queue to 11e header priorty value */
1073 tid = WME_AC_TO_TID(ac);
1074 qos[0] = tid & IEEE80211_QOS_TID;
1075 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1076 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1077 qos[1] = 0;
1078 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
1079
1080 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1081 /*
1082 * NB: don't assign a sequence # to potential
1083 * aggregates; we expect this happens at the
1084 * point the frame comes off any aggregation q
1085 * as otherwise we may introduce holes in the
1086 * BA sequence space and/or make window accouting
1087 * more difficult.
1088 *
1089 * XXX may want to control this with a driver
1090 * capability; this may also change when we pull
1091 * aggregation up into net80211
1092 */
1093 seqno = ni->ni_txseqs[tid]++;
1094 *(uint16_t *)wh->i_seq =
1095 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1096 M_SEQNO_SET(m, seqno);
1097 }
1098 } else {
1099 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1100 *(uint16_t *)wh->i_seq =
1101 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1102 M_SEQNO_SET(m, seqno);
1103 }
1104
1105 /* check if xmit fragmentation is required */
1106 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1107 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1108 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1109 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1110 if (key != NULL) {
1111 /*
1112 * IEEE 802.1X: send EAPOL frames always in the clear.
1113 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1114 */
1115 if ((m->m_flags & M_EAPOL) == 0 ||
1116 ((vap->iv_flags & IEEE80211_F_WPA) &&
1117 (vap->iv_opmode == IEEE80211_M_STA ?
1118 !IEEE80211_KEY_UNDEFINED(key) :
1119 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1120 wh->i_fc[1] |= IEEE80211_FC1_WEP;
1121 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1122 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1123 eh.ether_dhost,
1124 "%s", "enmic failed, discard frame");
1125 vap->iv_stats.is_crypto_enmicfail++;
1126 goto bad;
1127 }
1128 }
1129 }
1130 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1131 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1132 goto bad;
1133
1134 m->m_flags |= M_ENCAP; /* mark encapsulated */
1135
1136 IEEE80211_NODE_STAT(ni, tx_data);
1137 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1138 IEEE80211_NODE_STAT(ni, tx_mcast);
1139 m->m_flags |= M_MCAST;
1140 } else
1141 IEEE80211_NODE_STAT(ni, tx_ucast);
1142 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1143
1144 return m;
1145bad:
1146 if (m != NULL)
1147 m_freem(m);
1148 return NULL;
1149#undef WH4
1150}
1151
1152/*
1153 * Fragment the frame according to the specified mtu.
1154 * The size of the 802.11 header (w/o padding) is provided
1155 * so we don't need to recalculate it. We create a new
1156 * mbuf for each fragment and chain it through m_nextpkt;
1157 * we might be able to optimize this by reusing the original
1158 * packet's mbufs but that is significantly more complicated.
1159 */
1160static int
1161ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1162 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1163{
1164 struct ieee80211_frame *wh, *whf;
1165 struct mbuf *m, *prev, *next;
1166 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1167
1168 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1169 KASSERT(m0->m_pkthdr.len > mtu,
1170 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1171
1172 wh = mtod(m0, struct ieee80211_frame *);
1173 /* NB: mark the first frag; it will be propagated below */
1174 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1175 totalhdrsize = hdrsize + ciphdrsize;
1176 fragno = 1;
1177 off = mtu - ciphdrsize;
1178 remainder = m0->m_pkthdr.len - off;
1179 prev = m0;
1180 do {
1181 fragsize = totalhdrsize + remainder;
1182 if (fragsize > mtu)
1183 fragsize = mtu;
1184 /* XXX fragsize can be >2048! */
1185 KASSERT(fragsize < MCLBYTES,
1186 ("fragment size %u too big!", fragsize));
1187 if (fragsize > MHLEN)
1188 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
1189 else
1190 m = m_gethdr(M_DONTWAIT, MT_DATA);
1191 if (m == NULL)
1192 goto bad;
1193 /* leave room to prepend any cipher header */
1194 m_align(m, fragsize - ciphdrsize);
1195
1196 /*
1197 * Form the header in the fragment. Note that since
1198 * we mark the first fragment with the MORE_FRAG bit
1199 * it automatically is propagated to each fragment; we
1200 * need only clear it on the last fragment (done below).
1201 */
1202 whf = mtod(m, struct ieee80211_frame *);
1203 memcpy(whf, wh, hdrsize);
1204 *(uint16_t *)&whf->i_seq[0] |= htole16(
1205 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
1206 IEEE80211_SEQ_FRAG_SHIFT);
1207 fragno++;
1208
1209 payload = fragsize - totalhdrsize;
1210 /* NB: destination is known to be contiguous */
1211 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize);
1212 m->m_len = hdrsize + payload;
1213 m->m_pkthdr.len = hdrsize + payload;
1214 m->m_flags |= M_FRAG;
1215
1216 /* chain up the fragment */
1217 prev->m_nextpkt = m;
1218 prev = m;
1219
1220 /* deduct fragment just formed */
1221 remainder -= payload;
1222 off += payload;
1223 } while (remainder != 0);
1224
1225 /* set the last fragment */
1226 m->m_flags |= M_LASTFRAG;
1227 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
1228
1229 /* strip first mbuf now that everything has been copied */
1230 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
1231 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1232
1233 vap->iv_stats.is_tx_fragframes++;
1234 vap->iv_stats.is_tx_frags += fragno-1;
1235
1236 return 1;
1237bad:
1238 /* reclaim fragments but leave original frame for caller to free */
1239 for (m = m0->m_nextpkt; m != NULL; m = next) {
1240 next = m->m_nextpkt;
1241 m->m_nextpkt = NULL; /* XXX paranoid */
1242 m_freem(m);
1243 }
1244 m0->m_nextpkt = NULL;
1245 return 0;
1246}
1247
1248/*
1249 * Add a supported rates element id to a frame.
1250 */
1251static uint8_t *
1252ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
1253{
1254 int nrates;
1255
1256 *frm++ = IEEE80211_ELEMID_RATES;
1257 nrates = rs->rs_nrates;
1258 if (nrates > IEEE80211_RATE_SIZE)
1259 nrates = IEEE80211_RATE_SIZE;
1260 *frm++ = nrates;
1261 memcpy(frm, rs->rs_rates, nrates);
1262 return frm + nrates;
1263}
1264
1265/*
1266 * Add an extended supported rates element id to a frame.
1267 */
1268static uint8_t *
1269ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
1270{
1271 /*
1272 * Add an extended supported rates element if operating in 11g mode.
1273 */
1274 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
1275 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
1276 *frm++ = IEEE80211_ELEMID_XRATES;
1277 *frm++ = nrates;
1278 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
1279 frm += nrates;
1280 }
1281 return frm;
1282}
1283
1284/*
1285 * Add an ssid element to a frame.
1286 */
1287static uint8_t *
1288ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
1289{
1290 *frm++ = IEEE80211_ELEMID_SSID;
1291 *frm++ = len;
1292 memcpy(frm, ssid, len);
1293 return frm + len;
1294}
1295
1296/*
1297 * Add an erp element to a frame.
1298 */
1299static uint8_t *
1300ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
1301{
1302 uint8_t erp;
1303
1304 *frm++ = IEEE80211_ELEMID_ERP;
1305 *frm++ = 1;
1306 erp = 0;
1307 if (ic->ic_nonerpsta != 0)
1308 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
1309 if (ic->ic_flags & IEEE80211_F_USEPROT)
1310 erp |= IEEE80211_ERP_USE_PROTECTION;
1311 if (ic->ic_flags & IEEE80211_F_USEBARKER)
1312 erp |= IEEE80211_ERP_LONG_PREAMBLE;
1313 *frm++ = erp;
1314 return frm;
1315}
1316
1317/*
1318 * Add a CFParams element to a frame.
1319 */
1320static uint8_t *
1321ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
1322{
1323#define ADDSHORT(frm, v) do { \
1324 frm[0] = (v) & 0xff; \
1325 frm[1] = (v) >> 8; \
1326 frm += 2; \
1327} while (0)
1328 *frm++ = IEEE80211_ELEMID_CFPARMS;
1329 *frm++ = 6;
1330 *frm++ = 0; /* CFP count */
1331 *frm++ = 2; /* CFP period */
1332 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
1333 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
1334 return frm;
1335#undef ADDSHORT
1336}
1337
1338static __inline uint8_t *
1339add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
1340{
1341 memcpy(frm, ie->ie_data, ie->ie_len);
1342 return frm + ie->ie_len;
1343}
1344
1345static __inline uint8_t *
1346add_ie(uint8_t *frm, const uint8_t *ie)
1347{
1348 memcpy(frm, ie, 2 + ie[1]);
1349 return frm + 2 + ie[1];
1350}
1351
1352#define WME_OUI_BYTES 0x00, 0x50, 0xf2
1353/*
1354 * Add a WME information element to a frame.
1355 */
1356static uint8_t *
1357ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
1358{
1359 static const struct ieee80211_wme_info info = {
1360 .wme_id = IEEE80211_ELEMID_VENDOR,
1361 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
1362 .wme_oui = { WME_OUI_BYTES },
1363 .wme_type = WME_OUI_TYPE,
1364 .wme_subtype = WME_INFO_OUI_SUBTYPE,
1365 .wme_version = WME_VERSION,
1366 .wme_info = 0,
1367 };
1368 memcpy(frm, &info, sizeof(info));
1369 return frm + sizeof(info);
1370}
1371
1372/*
1373 * Add a WME parameters element to a frame.
1374 */
1375static uint8_t *
1376ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
1377{
1378#define SM(_v, _f) (((_v) << _f##_S) & _f)
1379#define ADDSHORT(frm, v) do { \
1380 frm[0] = (v) & 0xff; \
1381 frm[1] = (v) >> 8; \
1382 frm += 2; \
1383} while (0)
1384 /* NB: this works 'cuz a param has an info at the front */
1385 static const struct ieee80211_wme_info param = {
1386 .wme_id = IEEE80211_ELEMID_VENDOR,
1387 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
1388 .wme_oui = { WME_OUI_BYTES },
1389 .wme_type = WME_OUI_TYPE,
1390 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
1391 .wme_version = WME_VERSION,
1392 };
1393 int i;
1394
1395 memcpy(frm, ¶m, sizeof(param));
1396 frm += __offsetof(struct ieee80211_wme_info, wme_info);
1397 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
1398 *frm++ = 0; /* reserved field */
1399 for (i = 0; i < WME_NUM_AC; i++) {
1400 const struct wmeParams *ac =
1401 &wme->wme_bssChanParams.cap_wmeParams[i];
1402 *frm++ = SM(i, WME_PARAM_ACI)
1403 | SM(ac->wmep_acm, WME_PARAM_ACM)
1404 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
1405 ;
1406 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
1407 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
1408 ;
1409 ADDSHORT(frm, ac->wmep_txopLimit);
1410 }
1411 return frm;
1412#undef SM
1413#undef ADDSHORT
1414}
1415#undef WME_OUI_BYTES
1416
1417/*
1418 * Add an 11h Power Constraint element to a frame.
1419 */
1420static uint8_t *
1421ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
1422{
1423 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
1424 /* XXX per-vap tx power limit? */
1425 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
1426
1427 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
1428 frm[1] = 1;
1429 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
1430 return frm + 3;
1431}
1432
1433/*
1434 * Add an 11h Power Capability element to a frame.
1435 */
1436static uint8_t *
1437ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
1438{
1439 frm[0] = IEEE80211_ELEMID_PWRCAP;
1440 frm[1] = 2;
1441 frm[2] = c->ic_minpower;
1442 frm[3] = c->ic_maxpower;
1443 return frm + 4;
1444}
1445
1446/*
1447 * Add an 11h Supported Channels element to a frame.
1448 */
1449static uint8_t *
1450ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
1451{
1452 static const int ielen = 26;
1453
1454 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
1455 frm[1] = ielen;
1456 /* XXX not correct */
1457 memcpy(frm+2, ic->ic_chan_avail, ielen);
1458 return frm + 2 + ielen;
1459}
1460
1461/*
1462 * Add an 11h Channel Switch Announcement element to a frame.
1463 * Note that we use the per-vap CSA count to adjust the global
1464 * counter so we can use this routine to form probe response
1465 * frames and get the current count.
1466 */
1467static uint8_t *
1468ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
1469{
1470 struct ieee80211com *ic = vap->iv_ic;
1471 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
1472
1473 csa->csa_ie = IEEE80211_ELEMID_CSA;
1474 csa->csa_len = 3;
1475 csa->csa_mode = 1; /* XXX force quiet on channel */
1476 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
1477 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
1478 return frm + sizeof(*csa);
1479}
1480
1481/*
1482 * Add an 11h country information element to a frame.
1483 */
1484static uint8_t *
1485ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
1486{
1487
1488 if (ic->ic_countryie == NULL ||
1489 ic->ic_countryie_chan != ic->ic_bsschan) {
1490 /*
1491 * Handle lazy construction of ie. This is done on
1492 * first use and after a channel change that requires
1493 * re-calculation.
1494 */
1495 if (ic->ic_countryie != NULL)
1496 free(ic->ic_countryie, M_80211_NODE_IE);
1497 ic->ic_countryie = ieee80211_alloc_countryie(ic);
1498 if (ic->ic_countryie == NULL)
1499 return frm;
1500 ic->ic_countryie_chan = ic->ic_bsschan;
1501 }
1502 return add_appie(frm, ic->ic_countryie);
1503}
1504
1505/*
1506 * Send a probe request frame with the specified ssid
1507 * and any optional information element data.
1508 */
1509int
1510ieee80211_send_probereq(struct ieee80211_node *ni,
1511 const uint8_t sa[IEEE80211_ADDR_LEN],
1512 const uint8_t da[IEEE80211_ADDR_LEN],
1513 const uint8_t bssid[IEEE80211_ADDR_LEN],
1514 const uint8_t *ssid, size_t ssidlen)
1515{
1516 struct ieee80211vap *vap = ni->ni_vap;
1517 struct ieee80211com *ic = ni->ni_ic;
1518 const struct ieee80211_txparam *tp;
1519 struct ieee80211_bpf_params params;
1520 struct ieee80211_frame *wh;
1521 const struct ieee80211_rateset *rs;
1522 struct mbuf *m;
1523 uint8_t *frm;
1524
1525 if (vap->iv_state == IEEE80211_S_CAC) {
1526 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
1527 "block %s frame in CAC state", "probe request");
1528 vap->iv_stats.is_tx_badstate++;
1529 return EIO; /* XXX */
1530 }
1531
1532 /*
1533 * Hold a reference on the node so it doesn't go away until after
1534 * the xmit is complete all the way in the driver. On error we
1535 * will remove our reference.
1536 */
1537 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1538 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1539 __func__, __LINE__,
1540 ni, ether_sprintf(ni->ni_macaddr),
1541 ieee80211_node_refcnt(ni)+1);
1542 ieee80211_ref_node(ni);
1543
1544 /*
1545 * prreq frame format
1546 * [tlv] ssid
1547 * [tlv] supported rates
1548 * [tlv] RSN (optional)
1549 * [tlv] extended supported rates
1550 * [tlv] WPA (optional)
1551 * [tlv] user-specified ie's
1552 */
1553 m = ieee80211_getmgtframe(&frm,
1554 ic->ic_headroom + sizeof(struct ieee80211_frame),
1555 2 + IEEE80211_NWID_LEN
1556 + 2 + IEEE80211_RATE_SIZE
1557 + sizeof(struct ieee80211_ie_wpa)
1558 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1559 + sizeof(struct ieee80211_ie_wpa)
1560 + (vap->iv_appie_probereq != NULL ?
1561 vap->iv_appie_probereq->ie_len : 0)
1562 );
1563 if (m == NULL) {
1564 vap->iv_stats.is_tx_nobuf++;
1565 ieee80211_free_node(ni);
1566 return ENOMEM;
1567 }
1568
1569 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
1570 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
1571 frm = ieee80211_add_rates(frm, rs);
1572 if (vap->iv_flags & IEEE80211_F_WPA2) {
1573 if (vap->iv_rsn_ie != NULL)
1574 frm = add_ie(frm, vap->iv_rsn_ie);
1575 /* XXX else complain? */
1576 }
1577 frm = ieee80211_add_xrates(frm, rs);
1578 if (vap->iv_flags & IEEE80211_F_WPA1) {
1579 if (vap->iv_wpa_ie != NULL)
1580 frm = add_ie(frm, vap->iv_wpa_ie);
1581 /* XXX else complain? */
1582 }
1583 if (vap->iv_appie_probereq != NULL)
1584 frm = add_appie(frm, vap->iv_appie_probereq);
1585 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1586
1587 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
1588 ("leading space %zd", M_LEADINGSPACE(m)));
1589 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
1590 if (m == NULL) {
1591 /* NB: cannot happen */
1592 ieee80211_free_node(ni);
1593 return ENOMEM;
1594 }
1595
1596 wh = mtod(m, struct ieee80211_frame *);
1597 ieee80211_send_setup(ni, m,
1598 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
1599 IEEE80211_NONQOS_TID, sa, da, bssid);
1600 /* XXX power management? */
1601 m->m_flags |= M_ENCAP; /* mark encapsulated */
1602
1603 M_WME_SETAC(m, WME_AC_BE);
1604
1605 IEEE80211_NODE_STAT(ni, tx_probereq);
1606 IEEE80211_NODE_STAT(ni, tx_mgmt);
1607
1608 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1609 "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
1610 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
1611 ssidlen, ssid);
1612
1613 memset(¶ms, 0, sizeof(params));
1614 params.ibp_pri = M_WME_GETAC(m);
1615 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
1616 params.ibp_rate0 = tp->mgmtrate;
1617 if (IEEE80211_IS_MULTICAST(da)) {
1618 params.ibp_flags |= IEEE80211_BPF_NOACK;
1619 params.ibp_try0 = 1;
1620 } else
1621 params.ibp_try0 = tp->maxretry;
1622 params.ibp_power = ni->ni_txpower;
1623 return ic->ic_raw_xmit(ni, m, ¶ms);
1624}
1625
1626/*
1627 * Calculate capability information for mgt frames.
1628 */
1629static uint16_t
1630getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
1631{
1632 struct ieee80211com *ic = vap->iv_ic;
1633 uint16_t capinfo;
1634
1635 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
1636
1637 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
1638 capinfo = IEEE80211_CAPINFO_ESS;
1639 else if (vap->iv_opmode == IEEE80211_M_IBSS)
1640 capinfo = IEEE80211_CAPINFO_IBSS;
1641 else
1642 capinfo = 0;
1643 if (vap->iv_flags & IEEE80211_F_PRIVACY)
1644 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1645 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1646 IEEE80211_IS_CHAN_2GHZ(chan))
1647 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1648 if (ic->ic_flags & IEEE80211_F_SHSLOT)
1649 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1650 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
1651 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
1652 return capinfo;
1653}
1654
1655/*
1656 * Send a management frame. The node is for the destination (or ic_bss
1657 * when in station mode). Nodes other than ic_bss have their reference
1658 * count bumped to reflect our use for an indeterminant time.
1659 */
1660int
1661ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
1662{
1663#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
1664#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
1665 struct ieee80211vap *vap = ni->ni_vap;
1666 struct ieee80211com *ic = ni->ni_ic;
1667 struct ieee80211_node *bss = vap->iv_bss;
1668 struct ieee80211_bpf_params params;
1669 struct mbuf *m;
1670 uint8_t *frm;
1671 uint16_t capinfo;
1672 int has_challenge, is_shared_key, ret, status;
1673
1674 KASSERT(ni != NULL, ("null node"));
1675
1676 /*
1677 * Hold a reference on the node so it doesn't go away until after
1678 * the xmit is complete all the way in the driver. On error we
1679 * will remove our reference.
1680 */
1681 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1682 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1683 __func__, __LINE__,
1684 ni, ether_sprintf(ni->ni_macaddr),
1685 ieee80211_node_refcnt(ni)+1);
1686 ieee80211_ref_node(ni);
1687
1688 memset(¶ms, 0, sizeof(params));
1689 switch (type) {
1690
1691 case IEEE80211_FC0_SUBTYPE_AUTH:
1692 status = arg >> 16;
1693 arg &= 0xffff;
1694 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
1695 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
1696 ni->ni_challenge != NULL);
1697
1698 /*
1699 * Deduce whether we're doing open authentication or
1700 * shared key authentication. We do the latter if
1701 * we're in the middle of a shared key authentication
1702 * handshake or if we're initiating an authentication
1703 * request and configured to use shared key.
1704 */
1705 is_shared_key = has_challenge ||
1706 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
1707 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
1708 bss->ni_authmode == IEEE80211_AUTH_SHARED);
1709
1710 m = ieee80211_getmgtframe(&frm,
1711 ic->ic_headroom + sizeof(struct ieee80211_frame),
1712 3 * sizeof(uint16_t)
1713 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
1714 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
1715 );
1716 if (m == NULL)
1717 senderr(ENOMEM, is_tx_nobuf);
1718
1719 ((uint16_t *)frm)[0] =
1720 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
1721 : htole16(IEEE80211_AUTH_ALG_OPEN);
1722 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
1723 ((uint16_t *)frm)[2] = htole16(status);/* status */
1724
1725 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
1726 ((uint16_t *)frm)[3] =
1727 htole16((IEEE80211_CHALLENGE_LEN << 8) |
1728 IEEE80211_ELEMID_CHALLENGE);
1729 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
1730 IEEE80211_CHALLENGE_LEN);
1731 m->m_pkthdr.len = m->m_len =
1732 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
1733 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
1734 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1735 "request encrypt frame (%s)", __func__);
1736 /* mark frame for encryption */
1737 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
1738 }
1739 } else
1740 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
1741
1742 /* XXX not right for shared key */
1743 if (status == IEEE80211_STATUS_SUCCESS)
1744 IEEE80211_NODE_STAT(ni, tx_auth);
1745 else
1746 IEEE80211_NODE_STAT(ni, tx_auth_fail);
1747
1748 if (vap->iv_opmode == IEEE80211_M_STA)
1749 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
1750 (void *) vap->iv_state);
1751 break;
1752
1753 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1754 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1755 "send station deauthenticate (reason %d)", arg);
1756 m = ieee80211_getmgtframe(&frm,
1757 ic->ic_headroom + sizeof(struct ieee80211_frame),
1758 sizeof(uint16_t));
1759 if (m == NULL)
1760 senderr(ENOMEM, is_tx_nobuf);
1761 *(uint16_t *)frm = htole16(arg); /* reason */
1762 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1763
1764 IEEE80211_NODE_STAT(ni, tx_deauth);
1765 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
1766
1767 ieee80211_node_unauthorize(ni); /* port closed */
1768 break;
1769
1770 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1771 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1772 /*
1773 * asreq frame format
1774 * [2] capability information
1775 * [2] listen interval
1776 * [6*] current AP address (reassoc only)
1777 * [tlv] ssid
1778 * [tlv] supported rates
1779 * [tlv] extended supported rates
1780 * [4] power capability (optional)
1781 * [28] supported channels (optional)
1782 * [tlv] HT capabilities
1783 * [tlv] WME (optional)
1784 * [tlv] Vendor OUI HT capabilities (optional)
1785 * [tlv] Atheros capabilities (if negotiated)
1786 * [tlv] AppIE's (optional)
1787 */
1788 m = ieee80211_getmgtframe(&frm,
1789 ic->ic_headroom + sizeof(struct ieee80211_frame),
1790 sizeof(uint16_t)
1791 + sizeof(uint16_t)
1792 + IEEE80211_ADDR_LEN
1793 + 2 + IEEE80211_NWID_LEN
1794 + 2 + IEEE80211_RATE_SIZE
1795 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1796 + 4
1797 + 2 + 26
1798 + sizeof(struct ieee80211_wme_info)
1799 + sizeof(struct ieee80211_ie_htcap)
1800 + 4 + sizeof(struct ieee80211_ie_htcap)
1801#ifdef IEEE80211_SUPPORT_SUPERG
1802 + sizeof(struct ieee80211_ath_ie)
1803#endif
1804 + (vap->iv_appie_wpa != NULL ?
1805 vap->iv_appie_wpa->ie_len : 0)
1806 + (vap->iv_appie_assocreq != NULL ?
1807 vap->iv_appie_assocreq->ie_len : 0)
1808 );
1809 if (m == NULL)
1810 senderr(ENOMEM, is_tx_nobuf);
1811
1812 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1813 ("wrong mode %u", vap->iv_opmode));
1814 capinfo = IEEE80211_CAPINFO_ESS;
1815 if (vap->iv_flags & IEEE80211_F_PRIVACY)
1816 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1817 /*
1818 * NB: Some 11a AP's reject the request when
1819 * short premable is set.
1820 */
1821 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1822 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
1823 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1824 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1825 (ic->ic_caps & IEEE80211_C_SHSLOT))
1826 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1827 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
1828 (vap->iv_flags & IEEE80211_F_DOTH))
1829 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
1830 *(uint16_t *)frm = htole16(capinfo);
1831 frm += 2;
1832
1833 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
1834 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
1835 bss->ni_intval));
1836 frm += 2;
1837
1838 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1839 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
1840 frm += IEEE80211_ADDR_LEN;
1841 }
1842
1843 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1844 frm = ieee80211_add_rates(frm, &ni->ni_rates);
1845 if (vap->iv_flags & IEEE80211_F_WPA2) {
1846 if (vap->iv_rsn_ie != NULL)
1847 frm = add_ie(frm, vap->iv_rsn_ie);
1848 /* XXX else complain? */
1849 }
1850 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
1851 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
1852 frm = ieee80211_add_powercapability(frm,
1853 ic->ic_curchan);
1854 frm = ieee80211_add_supportedchannels(frm, ic);
1855 }
| 270 (m->m_flags & M_EAPOL) == 0) {
271 const int ac = M_WME_GETAC(m);
272 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac];
273
274 ieee80211_txampdu_count_packet(tap);
275 if (IEEE80211_AMPDU_RUNNING(tap)) {
276 /*
277 * Operational, mark frame for aggregation.
278 *
279 * XXX do tx aggregation here
280 */
281 m->m_flags |= M_AMPDU_MPDU;
282 } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
283 ic->ic_ampdu_enable(ni, tap)) {
284 /*
285 * Not negotiated yet, request service.
286 */
287 ieee80211_ampdu_request(ni, tap);
288 /* XXX hold frame for reply? */
289 }
290 }
291#ifdef IEEE80211_SUPPORT_SUPERG
292 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) {
293 m = ieee80211_ff_check(ni, m);
294 if (m == NULL) {
295 /* NB: any ni ref held on stageq */
296 continue;
297 }
298 }
299#endif /* IEEE80211_SUPPORT_SUPERG */
300 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
301 /*
302 * Encapsulate the packet in prep for transmission.
303 */
304 m = ieee80211_encap(vap, ni, m);
305 if (m == NULL) {
306 /* NB: stat+msg handled in ieee80211_encap */
307 ieee80211_free_node(ni);
308 continue;
309 }
310 }
311
312 error = parent->if_transmit(parent, m);
313 if (error != 0) {
314 /* NB: IFQ_HANDOFF reclaims mbuf */
315 ieee80211_free_node(ni);
316 } else {
317 ifp->if_opackets++;
318 }
319 ic->ic_lastdata = ticks;
320 }
321#undef IS_DWDS
322}
323
324/*
325 * 802.11 output routine. This is (currently) used only to
326 * connect bpf write calls to the 802.11 layer for injecting
327 * raw 802.11 frames.
328 */
329int
330ieee80211_output(struct ifnet *ifp, struct mbuf *m,
331 struct sockaddr *dst, struct route *ro)
332{
333#define senderr(e) do { error = (e); goto bad;} while (0)
334 struct ieee80211_node *ni = NULL;
335 struct ieee80211vap *vap;
336 struct ieee80211_frame *wh;
337 int error;
338
339 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
340 /*
341 * Short-circuit requests if the vap is marked OACTIVE
342 * as this is used when tearing down state to indicate
343 * the vap may be gone. This can also happen because a
344 * packet came down through ieee80211_start before the
345 * vap entered RUN state in which case it's also ok to
346 * just drop the frame. This should not be necessary
347 * but callers of if_output don't check OACTIVE.
348 */
349 senderr(ENETDOWN);
350 }
351 vap = ifp->if_softc;
352 /*
353 * Hand to the 802.3 code if not tagged as
354 * a raw 802.11 frame.
355 */
356 if (dst->sa_family != AF_IEEE80211)
357 return vap->iv_output(ifp, m, dst, ro);
358#ifdef MAC
359 error = mac_ifnet_check_transmit(ifp, m);
360 if (error)
361 senderr(error);
362#endif
363 if (ifp->if_flags & IFF_MONITOR)
364 senderr(ENETDOWN);
365 if (!IFNET_IS_UP_RUNNING(ifp))
366 senderr(ENETDOWN);
367 if (vap->iv_state == IEEE80211_S_CAC) {
368 IEEE80211_DPRINTF(vap,
369 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
370 "block %s frame in CAC state\n", "raw data");
371 vap->iv_stats.is_tx_badstate++;
372 senderr(EIO); /* XXX */
373 }
374 /* XXX bypass bridge, pfil, carp, etc. */
375
376 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
377 senderr(EIO); /* XXX */
378 wh = mtod(m, struct ieee80211_frame *);
379 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
380 IEEE80211_FC0_VERSION_0)
381 senderr(EIO); /* XXX */
382
383 /* locate destination node */
384 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
385 case IEEE80211_FC1_DIR_NODS:
386 case IEEE80211_FC1_DIR_FROMDS:
387 ni = ieee80211_find_txnode(vap, wh->i_addr1);
388 break;
389 case IEEE80211_FC1_DIR_TODS:
390 case IEEE80211_FC1_DIR_DSTODS:
391 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame))
392 senderr(EIO); /* XXX */
393 ni = ieee80211_find_txnode(vap, wh->i_addr3);
394 break;
395 default:
396 senderr(EIO); /* XXX */
397 }
398 if (ni == NULL) {
399 /*
400 * Permit packets w/ bpf params through regardless
401 * (see below about sa_len).
402 */
403 if (dst->sa_len == 0)
404 senderr(EHOSTUNREACH);
405 ni = ieee80211_ref_node(vap->iv_bss);
406 }
407
408 /*
409 * Sanitize mbuf for net80211 flags leaked from above.
410 *
411 * NB: This must be done before ieee80211_classify as
412 * it marks EAPOL in frames with M_EAPOL.
413 */
414 m->m_flags &= ~M_80211_TX;
415
416 /* calculate priority so drivers can find the tx queue */
417 /* XXX assumes an 802.3 frame */
418 if (ieee80211_classify(ni, m))
419 senderr(EIO); /* XXX */
420
421 IEEE80211_NODE_STAT(ni, tx_data);
422 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
423 IEEE80211_NODE_STAT(ni, tx_mcast);
424 m->m_flags |= M_MCAST;
425 } else
426 IEEE80211_NODE_STAT(ni, tx_ucast);
427 /* NB: ieee80211_encap does not include 802.11 header */
428 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
429
430 /*
431 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
432 * present by setting the sa_len field of the sockaddr (yes,
433 * this is a hack).
434 * NB: we assume sa_data is suitably aligned to cast.
435 */
436 return vap->iv_ic->ic_raw_xmit(ni, m,
437 (const struct ieee80211_bpf_params *)(dst->sa_len ?
438 dst->sa_data : NULL));
439bad:
440 if (m != NULL)
441 m_freem(m);
442 if (ni != NULL)
443 ieee80211_free_node(ni);
444 return error;
445#undef senderr
446}
447
448/*
449 * Set the direction field and address fields of an outgoing
450 * frame. Note this should be called early on in constructing
451 * a frame as it sets i_fc[1]; other bits can then be or'd in.
452 */
453static void
454ieee80211_send_setup(
455 struct ieee80211_node *ni,
456 struct mbuf *m,
457 int type, int tid,
458 const uint8_t sa[IEEE80211_ADDR_LEN],
459 const uint8_t da[IEEE80211_ADDR_LEN],
460 const uint8_t bssid[IEEE80211_ADDR_LEN])
461{
462#define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
463 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
464 ieee80211_seq seqno;
465
466 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
467 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
468 struct ieee80211vap *vap = ni->ni_vap;
469
470 switch (vap->iv_opmode) {
471 case IEEE80211_M_STA:
472 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
473 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
474 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
475 IEEE80211_ADDR_COPY(wh->i_addr3, da);
476 break;
477 case IEEE80211_M_IBSS:
478 case IEEE80211_M_AHDEMO:
479 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
480 IEEE80211_ADDR_COPY(wh->i_addr1, da);
481 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
482 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
483 break;
484 case IEEE80211_M_HOSTAP:
485 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
486 IEEE80211_ADDR_COPY(wh->i_addr1, da);
487 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
488 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
489 break;
490 case IEEE80211_M_WDS:
491 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
492 IEEE80211_ADDR_COPY(wh->i_addr1, da);
493 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
494 IEEE80211_ADDR_COPY(wh->i_addr3, da);
495 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
496 break;
497 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
498 break;
499 }
500 } else {
501 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
502 IEEE80211_ADDR_COPY(wh->i_addr1, da);
503 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
504 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
505 }
506 *(uint16_t *)&wh->i_dur[0] = 0;
507
508 seqno = ni->ni_txseqs[tid]++;
509 *(uint16_t *)&wh->i_seq[0] = htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
510 M_SEQNO_SET(m, seqno);
511
512 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
513 m->m_flags |= M_MCAST;
514#undef WH4
515}
516
517/*
518 * Send a management frame to the specified node. The node pointer
519 * must have a reference as the pointer will be passed to the driver
520 * and potentially held for a long time. If the frame is successfully
521 * dispatched to the driver, then it is responsible for freeing the
522 * reference (and potentially free'ing up any associated storage);
523 * otherwise deal with reclaiming any reference (on error).
524 */
525int
526ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
527 struct ieee80211_bpf_params *params)
528{
529 struct ieee80211vap *vap = ni->ni_vap;
530 struct ieee80211com *ic = ni->ni_ic;
531 struct ieee80211_frame *wh;
532
533 KASSERT(ni != NULL, ("null node"));
534
535 if (vap->iv_state == IEEE80211_S_CAC) {
536 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
537 ni, "block %s frame in CAC state",
538 ieee80211_mgt_subtype_name[
539 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
540 IEEE80211_FC0_SUBTYPE_SHIFT]);
541 vap->iv_stats.is_tx_badstate++;
542 ieee80211_free_node(ni);
543 m_freem(m);
544 return EIO; /* XXX */
545 }
546
547 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
548 if (m == NULL) {
549 ieee80211_free_node(ni);
550 return ENOMEM;
551 }
552
553 wh = mtod(m, struct ieee80211_frame *);
554 ieee80211_send_setup(ni, m,
555 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
556 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
557 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
558 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
559 "encrypting frame (%s)", __func__);
560 wh->i_fc[1] |= IEEE80211_FC1_WEP;
561 }
562 m->m_flags |= M_ENCAP; /* mark encapsulated */
563
564 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
565 M_WME_SETAC(m, params->ibp_pri);
566
567#ifdef IEEE80211_DEBUG
568 /* avoid printing too many frames */
569 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
570 ieee80211_msg_dumppkts(vap)) {
571 printf("[%s] send %s on channel %u\n",
572 ether_sprintf(wh->i_addr1),
573 ieee80211_mgt_subtype_name[
574 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
575 IEEE80211_FC0_SUBTYPE_SHIFT],
576 ieee80211_chan2ieee(ic, ic->ic_curchan));
577 }
578#endif
579 IEEE80211_NODE_STAT(ni, tx_mgmt);
580
581 return ic->ic_raw_xmit(ni, m, params);
582}
583
584/*
585 * Send a null data frame to the specified node. If the station
586 * is setup for QoS then a QoS Null Data frame is constructed.
587 * If this is a WDS station then a 4-address frame is constructed.
588 *
589 * NB: the caller is assumed to have setup a node reference
590 * for use; this is necessary to deal with a race condition
591 * when probing for inactive stations. Like ieee80211_mgmt_output
592 * we must cleanup any node reference on error; however we
593 * can safely just unref it as we know it will never be the
594 * last reference to the node.
595 */
596int
597ieee80211_send_nulldata(struct ieee80211_node *ni)
598{
599 struct ieee80211vap *vap = ni->ni_vap;
600 struct ieee80211com *ic = ni->ni_ic;
601 struct mbuf *m;
602 struct ieee80211_frame *wh;
603 int hdrlen;
604 uint8_t *frm;
605
606 if (vap->iv_state == IEEE80211_S_CAC) {
607 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
608 ni, "block %s frame in CAC state", "null data");
609 ieee80211_unref_node(&ni);
610 vap->iv_stats.is_tx_badstate++;
611 return EIO; /* XXX */
612 }
613
614 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
615 hdrlen = sizeof(struct ieee80211_qosframe);
616 else
617 hdrlen = sizeof(struct ieee80211_frame);
618 /* NB: only WDS vap's get 4-address frames */
619 if (vap->iv_opmode == IEEE80211_M_WDS)
620 hdrlen += IEEE80211_ADDR_LEN;
621 if (ic->ic_flags & IEEE80211_F_DATAPAD)
622 hdrlen = roundup(hdrlen, sizeof(uint32_t));
623
624 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
625 if (m == NULL) {
626 /* XXX debug msg */
627 ieee80211_unref_node(&ni);
628 vap->iv_stats.is_tx_nobuf++;
629 return ENOMEM;
630 }
631 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
632 ("leading space %zd", M_LEADINGSPACE(m)));
633 M_PREPEND(m, hdrlen, M_DONTWAIT);
634 if (m == NULL) {
635 /* NB: cannot happen */
636 ieee80211_free_node(ni);
637 return ENOMEM;
638 }
639
640 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
641 if (ni->ni_flags & IEEE80211_NODE_QOS) {
642 const int tid = WME_AC_TO_TID(WME_AC_BE);
643 uint8_t *qos;
644
645 ieee80211_send_setup(ni, m,
646 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
647 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
648
649 if (vap->iv_opmode == IEEE80211_M_WDS)
650 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
651 else
652 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
653 qos[0] = tid & IEEE80211_QOS_TID;
654 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
655 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
656 qos[1] = 0;
657 } else {
658 ieee80211_send_setup(ni, m,
659 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
660 IEEE80211_NONQOS_TID,
661 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
662 }
663 if (vap->iv_opmode != IEEE80211_M_WDS) {
664 /* NB: power management bit is never sent by an AP */
665 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
666 vap->iv_opmode != IEEE80211_M_HOSTAP)
667 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
668 }
669 m->m_len = m->m_pkthdr.len = hdrlen;
670 m->m_flags |= M_ENCAP; /* mark encapsulated */
671
672 M_WME_SETAC(m, WME_AC_BE);
673
674 IEEE80211_NODE_STAT(ni, tx_data);
675
676 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
677 "send %snull data frame on channel %u, pwr mgt %s",
678 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
679 ieee80211_chan2ieee(ic, ic->ic_curchan),
680 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
681
682 return ic->ic_raw_xmit(ni, m, NULL);
683}
684
685/*
686 * Assign priority to a frame based on any vlan tag assigned
687 * to the station and/or any Diffserv setting in an IP header.
688 * Finally, if an ACM policy is setup (in station mode) it's
689 * applied.
690 */
691int
692ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
693{
694 const struct ether_header *eh = mtod(m, struct ether_header *);
695 int v_wme_ac, d_wme_ac, ac;
696
697 /*
698 * Always promote PAE/EAPOL frames to high priority.
699 */
700 if (eh->ether_type == htons(ETHERTYPE_PAE)) {
701 /* NB: mark so others don't need to check header */
702 m->m_flags |= M_EAPOL;
703 ac = WME_AC_VO;
704 goto done;
705 }
706 /*
707 * Non-qos traffic goes to BE.
708 */
709 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
710 ac = WME_AC_BE;
711 goto done;
712 }
713
714 /*
715 * If node has a vlan tag then all traffic
716 * to it must have a matching tag.
717 */
718 v_wme_ac = 0;
719 if (ni->ni_vlan != 0) {
720 if ((m->m_flags & M_VLANTAG) == 0) {
721 IEEE80211_NODE_STAT(ni, tx_novlantag);
722 return 1;
723 }
724 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
725 EVL_VLANOFTAG(ni->ni_vlan)) {
726 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
727 return 1;
728 }
729 /* map vlan priority to AC */
730 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
731 }
732
733#ifdef INET
734 if (eh->ether_type == htons(ETHERTYPE_IP)) {
735 uint8_t tos;
736 /*
737 * IP frame, map the DSCP bits from the TOS field.
738 */
739 /* XXX m_copydata may be too slow for fast path */
740 /* NB: ip header may not be in first mbuf */
741 m_copydata(m, sizeof(struct ether_header) +
742 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
743 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
744 d_wme_ac = TID_TO_WME_AC(tos);
745 } else {
746#endif /* INET */
747 d_wme_ac = WME_AC_BE;
748#ifdef INET
749 }
750#endif
751 /*
752 * Use highest priority AC.
753 */
754 if (v_wme_ac > d_wme_ac)
755 ac = v_wme_ac;
756 else
757 ac = d_wme_ac;
758
759 /*
760 * Apply ACM policy.
761 */
762 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
763 static const int acmap[4] = {
764 WME_AC_BK, /* WME_AC_BE */
765 WME_AC_BK, /* WME_AC_BK */
766 WME_AC_BE, /* WME_AC_VI */
767 WME_AC_VI, /* WME_AC_VO */
768 };
769 struct ieee80211com *ic = ni->ni_ic;
770
771 while (ac != WME_AC_BK &&
772 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
773 ac = acmap[ac];
774 }
775done:
776 M_WME_SETAC(m, ac);
777 return 0;
778}
779
780/*
781 * Insure there is sufficient contiguous space to encapsulate the
782 * 802.11 data frame. If room isn't already there, arrange for it.
783 * Drivers and cipher modules assume we have done the necessary work
784 * and fail rudely if they don't find the space they need.
785 */
786struct mbuf *
787ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
788 struct ieee80211_key *key, struct mbuf *m)
789{
790#define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
791 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
792
793 if (key != NULL) {
794 /* XXX belongs in crypto code? */
795 needed_space += key->wk_cipher->ic_header;
796 /* XXX frags */
797 /*
798 * When crypto is being done in the host we must insure
799 * the data are writable for the cipher routines; clone
800 * a writable mbuf chain.
801 * XXX handle SWMIC specially
802 */
803 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
804 m = m_unshare(m, M_NOWAIT);
805 if (m == NULL) {
806 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
807 "%s: cannot get writable mbuf\n", __func__);
808 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
809 return NULL;
810 }
811 }
812 }
813 /*
814 * We know we are called just before stripping an Ethernet
815 * header and prepending an LLC header. This means we know
816 * there will be
817 * sizeof(struct ether_header) - sizeof(struct llc)
818 * bytes recovered to which we need additional space for the
819 * 802.11 header and any crypto header.
820 */
821 /* XXX check trailing space and copy instead? */
822 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
823 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
824 if (n == NULL) {
825 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
826 "%s: cannot expand storage\n", __func__);
827 vap->iv_stats.is_tx_nobuf++;
828 m_freem(m);
829 return NULL;
830 }
831 KASSERT(needed_space <= MHLEN,
832 ("not enough room, need %u got %zu\n", needed_space, MHLEN));
833 /*
834 * Setup new mbuf to have leading space to prepend the
835 * 802.11 header and any crypto header bits that are
836 * required (the latter are added when the driver calls
837 * back to ieee80211_crypto_encap to do crypto encapsulation).
838 */
839 /* NB: must be first 'cuz it clobbers m_data */
840 m_move_pkthdr(n, m);
841 n->m_len = 0; /* NB: m_gethdr does not set */
842 n->m_data += needed_space;
843 /*
844 * Pull up Ethernet header to create the expected layout.
845 * We could use m_pullup but that's overkill (i.e. we don't
846 * need the actual data) and it cannot fail so do it inline
847 * for speed.
848 */
849 /* NB: struct ether_header is known to be contiguous */
850 n->m_len += sizeof(struct ether_header);
851 m->m_len -= sizeof(struct ether_header);
852 m->m_data += sizeof(struct ether_header);
853 /*
854 * Replace the head of the chain.
855 */
856 n->m_next = m;
857 m = n;
858 }
859 return m;
860#undef TO_BE_RECLAIMED
861}
862
863/*
864 * Return the transmit key to use in sending a unicast frame.
865 * If a unicast key is set we use that. When no unicast key is set
866 * we fall back to the default transmit key.
867 */
868static __inline struct ieee80211_key *
869ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
870 struct ieee80211_node *ni)
871{
872 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
873 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
874 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
875 return NULL;
876 return &vap->iv_nw_keys[vap->iv_def_txkey];
877 } else {
878 return &ni->ni_ucastkey;
879 }
880}
881
882/*
883 * Return the transmit key to use in sending a multicast frame.
884 * Multicast traffic always uses the group key which is installed as
885 * the default tx key.
886 */
887static __inline struct ieee80211_key *
888ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
889 struct ieee80211_node *ni)
890{
891 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
892 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
893 return NULL;
894 return &vap->iv_nw_keys[vap->iv_def_txkey];
895}
896
897/*
898 * Encapsulate an outbound data frame. The mbuf chain is updated.
899 * If an error is encountered NULL is returned. The caller is required
900 * to provide a node reference and pullup the ethernet header in the
901 * first mbuf.
902 *
903 * NB: Packet is assumed to be processed by ieee80211_classify which
904 * marked EAPOL frames w/ M_EAPOL.
905 */
906struct mbuf *
907ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
908 struct mbuf *m)
909{
910#define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
911 struct ieee80211com *ic = ni->ni_ic;
912 struct ether_header eh;
913 struct ieee80211_frame *wh;
914 struct ieee80211_key *key;
915 struct llc *llc;
916 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
917 ieee80211_seq seqno;
918
919 /*
920 * Copy existing Ethernet header to a safe place. The
921 * rest of the code assumes it's ok to strip it when
922 * reorganizing state for the final encapsulation.
923 */
924 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
925 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
926
927 /*
928 * Insure space for additional headers. First identify
929 * transmit key to use in calculating any buffer adjustments
930 * required. This is also used below to do privacy
931 * encapsulation work. Then calculate the 802.11 header
932 * size and any padding required by the driver.
933 *
934 * Note key may be NULL if we fall back to the default
935 * transmit key and that is not set. In that case the
936 * buffer may not be expanded as needed by the cipher
937 * routines, but they will/should discard it.
938 */
939 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
940 if (vap->iv_opmode == IEEE80211_M_STA ||
941 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
942 (vap->iv_opmode == IEEE80211_M_WDS &&
943 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
944 key = ieee80211_crypto_getucastkey(vap, ni);
945 else
946 key = ieee80211_crypto_getmcastkey(vap, ni);
947 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
948 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
949 eh.ether_dhost,
950 "no default transmit key (%s) deftxkey %u",
951 __func__, vap->iv_def_txkey);
952 vap->iv_stats.is_tx_nodefkey++;
953 goto bad;
954 }
955 } else
956 key = NULL;
957 /*
958 * XXX Some ap's don't handle QoS-encapsulated EAPOL
959 * frames so suppress use. This may be an issue if other
960 * ap's require all data frames to be QoS-encapsulated
961 * once negotiated in which case we'll need to make this
962 * configurable.
963 */
964 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) &&
965 (m->m_flags & M_EAPOL) == 0;
966 if (addqos)
967 hdrsize = sizeof(struct ieee80211_qosframe);
968 else
969 hdrsize = sizeof(struct ieee80211_frame);
970 /*
971 * 4-address frames need to be generated for:
972 * o packets sent through a WDS vap (IEEE80211_M_WDS)
973 * o packets sent through a vap marked for relaying
974 * (e.g. a station operating with dynamic WDS)
975 */
976 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
977 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
978 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
979 if (is4addr)
980 hdrsize += IEEE80211_ADDR_LEN;
981 /*
982 * Honor driver DATAPAD requirement.
983 */
984 if (ic->ic_flags & IEEE80211_F_DATAPAD)
985 hdrspace = roundup(hdrsize, sizeof(uint32_t));
986 else
987 hdrspace = hdrsize;
988
989 if (__predict_true((m->m_flags & M_FF) == 0)) {
990 /*
991 * Normal frame.
992 */
993 m = ieee80211_mbuf_adjust(vap, hdrspace, key, m);
994 if (m == NULL) {
995 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
996 goto bad;
997 }
998 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
999 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1000 llc = mtod(m, struct llc *);
1001 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1002 llc->llc_control = LLC_UI;
1003 llc->llc_snap.org_code[0] = 0;
1004 llc->llc_snap.org_code[1] = 0;
1005 llc->llc_snap.org_code[2] = 0;
1006 llc->llc_snap.ether_type = eh.ether_type;
1007 } else {
1008#ifdef IEEE80211_SUPPORT_SUPERG
1009 /*
1010 * Aggregated frame.
1011 */
1012 m = ieee80211_ff_encap(vap, m, hdrspace, key);
1013 if (m == NULL)
1014#endif
1015 goto bad;
1016 }
1017 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1018
1019 M_PREPEND(m, hdrspace, M_DONTWAIT);
1020 if (m == NULL) {
1021 vap->iv_stats.is_tx_nobuf++;
1022 goto bad;
1023 }
1024 wh = mtod(m, struct ieee80211_frame *);
1025 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1026 *(uint16_t *)wh->i_dur = 0;
1027 if (is4addr) {
1028 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1029 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1030 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1031 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1032 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1033 } else switch (vap->iv_opmode) {
1034 case IEEE80211_M_STA:
1035 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1036 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1037 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1038 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1039 break;
1040 case IEEE80211_M_IBSS:
1041 case IEEE80211_M_AHDEMO:
1042 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1043 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1044 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1045 /*
1046 * NB: always use the bssid from iv_bss as the
1047 * neighbor's may be stale after an ibss merge
1048 */
1049 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1050 break;
1051 case IEEE80211_M_HOSTAP:
1052 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1053 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1054 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1055 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1056 break;
1057 case IEEE80211_M_MONITOR:
1058 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1059 goto bad;
1060 }
1061 if (m->m_flags & M_MORE_DATA)
1062 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1063 if (addqos) {
1064 uint8_t *qos;
1065 int ac, tid;
1066
1067 if (is4addr) {
1068 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1069 } else
1070 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1071 ac = M_WME_GETAC(m);
1072 /* map from access class/queue to 11e header priorty value */
1073 tid = WME_AC_TO_TID(ac);
1074 qos[0] = tid & IEEE80211_QOS_TID;
1075 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1076 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1077 qos[1] = 0;
1078 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
1079
1080 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1081 /*
1082 * NB: don't assign a sequence # to potential
1083 * aggregates; we expect this happens at the
1084 * point the frame comes off any aggregation q
1085 * as otherwise we may introduce holes in the
1086 * BA sequence space and/or make window accouting
1087 * more difficult.
1088 *
1089 * XXX may want to control this with a driver
1090 * capability; this may also change when we pull
1091 * aggregation up into net80211
1092 */
1093 seqno = ni->ni_txseqs[tid]++;
1094 *(uint16_t *)wh->i_seq =
1095 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1096 M_SEQNO_SET(m, seqno);
1097 }
1098 } else {
1099 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1100 *(uint16_t *)wh->i_seq =
1101 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1102 M_SEQNO_SET(m, seqno);
1103 }
1104
1105 /* check if xmit fragmentation is required */
1106 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1107 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1108 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1109 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1110 if (key != NULL) {
1111 /*
1112 * IEEE 802.1X: send EAPOL frames always in the clear.
1113 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1114 */
1115 if ((m->m_flags & M_EAPOL) == 0 ||
1116 ((vap->iv_flags & IEEE80211_F_WPA) &&
1117 (vap->iv_opmode == IEEE80211_M_STA ?
1118 !IEEE80211_KEY_UNDEFINED(key) :
1119 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1120 wh->i_fc[1] |= IEEE80211_FC1_WEP;
1121 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1122 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1123 eh.ether_dhost,
1124 "%s", "enmic failed, discard frame");
1125 vap->iv_stats.is_crypto_enmicfail++;
1126 goto bad;
1127 }
1128 }
1129 }
1130 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1131 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1132 goto bad;
1133
1134 m->m_flags |= M_ENCAP; /* mark encapsulated */
1135
1136 IEEE80211_NODE_STAT(ni, tx_data);
1137 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1138 IEEE80211_NODE_STAT(ni, tx_mcast);
1139 m->m_flags |= M_MCAST;
1140 } else
1141 IEEE80211_NODE_STAT(ni, tx_ucast);
1142 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1143
1144 return m;
1145bad:
1146 if (m != NULL)
1147 m_freem(m);
1148 return NULL;
1149#undef WH4
1150}
1151
1152/*
1153 * Fragment the frame according to the specified mtu.
1154 * The size of the 802.11 header (w/o padding) is provided
1155 * so we don't need to recalculate it. We create a new
1156 * mbuf for each fragment and chain it through m_nextpkt;
1157 * we might be able to optimize this by reusing the original
1158 * packet's mbufs but that is significantly more complicated.
1159 */
1160static int
1161ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1162 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1163{
1164 struct ieee80211_frame *wh, *whf;
1165 struct mbuf *m, *prev, *next;
1166 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1167
1168 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1169 KASSERT(m0->m_pkthdr.len > mtu,
1170 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1171
1172 wh = mtod(m0, struct ieee80211_frame *);
1173 /* NB: mark the first frag; it will be propagated below */
1174 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1175 totalhdrsize = hdrsize + ciphdrsize;
1176 fragno = 1;
1177 off = mtu - ciphdrsize;
1178 remainder = m0->m_pkthdr.len - off;
1179 prev = m0;
1180 do {
1181 fragsize = totalhdrsize + remainder;
1182 if (fragsize > mtu)
1183 fragsize = mtu;
1184 /* XXX fragsize can be >2048! */
1185 KASSERT(fragsize < MCLBYTES,
1186 ("fragment size %u too big!", fragsize));
1187 if (fragsize > MHLEN)
1188 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
1189 else
1190 m = m_gethdr(M_DONTWAIT, MT_DATA);
1191 if (m == NULL)
1192 goto bad;
1193 /* leave room to prepend any cipher header */
1194 m_align(m, fragsize - ciphdrsize);
1195
1196 /*
1197 * Form the header in the fragment. Note that since
1198 * we mark the first fragment with the MORE_FRAG bit
1199 * it automatically is propagated to each fragment; we
1200 * need only clear it on the last fragment (done below).
1201 */
1202 whf = mtod(m, struct ieee80211_frame *);
1203 memcpy(whf, wh, hdrsize);
1204 *(uint16_t *)&whf->i_seq[0] |= htole16(
1205 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
1206 IEEE80211_SEQ_FRAG_SHIFT);
1207 fragno++;
1208
1209 payload = fragsize - totalhdrsize;
1210 /* NB: destination is known to be contiguous */
1211 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize);
1212 m->m_len = hdrsize + payload;
1213 m->m_pkthdr.len = hdrsize + payload;
1214 m->m_flags |= M_FRAG;
1215
1216 /* chain up the fragment */
1217 prev->m_nextpkt = m;
1218 prev = m;
1219
1220 /* deduct fragment just formed */
1221 remainder -= payload;
1222 off += payload;
1223 } while (remainder != 0);
1224
1225 /* set the last fragment */
1226 m->m_flags |= M_LASTFRAG;
1227 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
1228
1229 /* strip first mbuf now that everything has been copied */
1230 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
1231 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1232
1233 vap->iv_stats.is_tx_fragframes++;
1234 vap->iv_stats.is_tx_frags += fragno-1;
1235
1236 return 1;
1237bad:
1238 /* reclaim fragments but leave original frame for caller to free */
1239 for (m = m0->m_nextpkt; m != NULL; m = next) {
1240 next = m->m_nextpkt;
1241 m->m_nextpkt = NULL; /* XXX paranoid */
1242 m_freem(m);
1243 }
1244 m0->m_nextpkt = NULL;
1245 return 0;
1246}
1247
1248/*
1249 * Add a supported rates element id to a frame.
1250 */
1251static uint8_t *
1252ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
1253{
1254 int nrates;
1255
1256 *frm++ = IEEE80211_ELEMID_RATES;
1257 nrates = rs->rs_nrates;
1258 if (nrates > IEEE80211_RATE_SIZE)
1259 nrates = IEEE80211_RATE_SIZE;
1260 *frm++ = nrates;
1261 memcpy(frm, rs->rs_rates, nrates);
1262 return frm + nrates;
1263}
1264
1265/*
1266 * Add an extended supported rates element id to a frame.
1267 */
1268static uint8_t *
1269ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
1270{
1271 /*
1272 * Add an extended supported rates element if operating in 11g mode.
1273 */
1274 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
1275 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
1276 *frm++ = IEEE80211_ELEMID_XRATES;
1277 *frm++ = nrates;
1278 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
1279 frm += nrates;
1280 }
1281 return frm;
1282}
1283
1284/*
1285 * Add an ssid element to a frame.
1286 */
1287static uint8_t *
1288ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
1289{
1290 *frm++ = IEEE80211_ELEMID_SSID;
1291 *frm++ = len;
1292 memcpy(frm, ssid, len);
1293 return frm + len;
1294}
1295
1296/*
1297 * Add an erp element to a frame.
1298 */
1299static uint8_t *
1300ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
1301{
1302 uint8_t erp;
1303
1304 *frm++ = IEEE80211_ELEMID_ERP;
1305 *frm++ = 1;
1306 erp = 0;
1307 if (ic->ic_nonerpsta != 0)
1308 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
1309 if (ic->ic_flags & IEEE80211_F_USEPROT)
1310 erp |= IEEE80211_ERP_USE_PROTECTION;
1311 if (ic->ic_flags & IEEE80211_F_USEBARKER)
1312 erp |= IEEE80211_ERP_LONG_PREAMBLE;
1313 *frm++ = erp;
1314 return frm;
1315}
1316
1317/*
1318 * Add a CFParams element to a frame.
1319 */
1320static uint8_t *
1321ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
1322{
1323#define ADDSHORT(frm, v) do { \
1324 frm[0] = (v) & 0xff; \
1325 frm[1] = (v) >> 8; \
1326 frm += 2; \
1327} while (0)
1328 *frm++ = IEEE80211_ELEMID_CFPARMS;
1329 *frm++ = 6;
1330 *frm++ = 0; /* CFP count */
1331 *frm++ = 2; /* CFP period */
1332 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
1333 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
1334 return frm;
1335#undef ADDSHORT
1336}
1337
1338static __inline uint8_t *
1339add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
1340{
1341 memcpy(frm, ie->ie_data, ie->ie_len);
1342 return frm + ie->ie_len;
1343}
1344
1345static __inline uint8_t *
1346add_ie(uint8_t *frm, const uint8_t *ie)
1347{
1348 memcpy(frm, ie, 2 + ie[1]);
1349 return frm + 2 + ie[1];
1350}
1351
1352#define WME_OUI_BYTES 0x00, 0x50, 0xf2
1353/*
1354 * Add a WME information element to a frame.
1355 */
1356static uint8_t *
1357ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
1358{
1359 static const struct ieee80211_wme_info info = {
1360 .wme_id = IEEE80211_ELEMID_VENDOR,
1361 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
1362 .wme_oui = { WME_OUI_BYTES },
1363 .wme_type = WME_OUI_TYPE,
1364 .wme_subtype = WME_INFO_OUI_SUBTYPE,
1365 .wme_version = WME_VERSION,
1366 .wme_info = 0,
1367 };
1368 memcpy(frm, &info, sizeof(info));
1369 return frm + sizeof(info);
1370}
1371
1372/*
1373 * Add a WME parameters element to a frame.
1374 */
1375static uint8_t *
1376ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
1377{
1378#define SM(_v, _f) (((_v) << _f##_S) & _f)
1379#define ADDSHORT(frm, v) do { \
1380 frm[0] = (v) & 0xff; \
1381 frm[1] = (v) >> 8; \
1382 frm += 2; \
1383} while (0)
1384 /* NB: this works 'cuz a param has an info at the front */
1385 static const struct ieee80211_wme_info param = {
1386 .wme_id = IEEE80211_ELEMID_VENDOR,
1387 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
1388 .wme_oui = { WME_OUI_BYTES },
1389 .wme_type = WME_OUI_TYPE,
1390 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
1391 .wme_version = WME_VERSION,
1392 };
1393 int i;
1394
1395 memcpy(frm, ¶m, sizeof(param));
1396 frm += __offsetof(struct ieee80211_wme_info, wme_info);
1397 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
1398 *frm++ = 0; /* reserved field */
1399 for (i = 0; i < WME_NUM_AC; i++) {
1400 const struct wmeParams *ac =
1401 &wme->wme_bssChanParams.cap_wmeParams[i];
1402 *frm++ = SM(i, WME_PARAM_ACI)
1403 | SM(ac->wmep_acm, WME_PARAM_ACM)
1404 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
1405 ;
1406 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
1407 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
1408 ;
1409 ADDSHORT(frm, ac->wmep_txopLimit);
1410 }
1411 return frm;
1412#undef SM
1413#undef ADDSHORT
1414}
1415#undef WME_OUI_BYTES
1416
1417/*
1418 * Add an 11h Power Constraint element to a frame.
1419 */
1420static uint8_t *
1421ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
1422{
1423 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
1424 /* XXX per-vap tx power limit? */
1425 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
1426
1427 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
1428 frm[1] = 1;
1429 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
1430 return frm + 3;
1431}
1432
1433/*
1434 * Add an 11h Power Capability element to a frame.
1435 */
1436static uint8_t *
1437ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
1438{
1439 frm[0] = IEEE80211_ELEMID_PWRCAP;
1440 frm[1] = 2;
1441 frm[2] = c->ic_minpower;
1442 frm[3] = c->ic_maxpower;
1443 return frm + 4;
1444}
1445
1446/*
1447 * Add an 11h Supported Channels element to a frame.
1448 */
1449static uint8_t *
1450ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
1451{
1452 static const int ielen = 26;
1453
1454 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
1455 frm[1] = ielen;
1456 /* XXX not correct */
1457 memcpy(frm+2, ic->ic_chan_avail, ielen);
1458 return frm + 2 + ielen;
1459}
1460
1461/*
1462 * Add an 11h Channel Switch Announcement element to a frame.
1463 * Note that we use the per-vap CSA count to adjust the global
1464 * counter so we can use this routine to form probe response
1465 * frames and get the current count.
1466 */
1467static uint8_t *
1468ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
1469{
1470 struct ieee80211com *ic = vap->iv_ic;
1471 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
1472
1473 csa->csa_ie = IEEE80211_ELEMID_CSA;
1474 csa->csa_len = 3;
1475 csa->csa_mode = 1; /* XXX force quiet on channel */
1476 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
1477 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
1478 return frm + sizeof(*csa);
1479}
1480
1481/*
1482 * Add an 11h country information element to a frame.
1483 */
1484static uint8_t *
1485ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
1486{
1487
1488 if (ic->ic_countryie == NULL ||
1489 ic->ic_countryie_chan != ic->ic_bsschan) {
1490 /*
1491 * Handle lazy construction of ie. This is done on
1492 * first use and after a channel change that requires
1493 * re-calculation.
1494 */
1495 if (ic->ic_countryie != NULL)
1496 free(ic->ic_countryie, M_80211_NODE_IE);
1497 ic->ic_countryie = ieee80211_alloc_countryie(ic);
1498 if (ic->ic_countryie == NULL)
1499 return frm;
1500 ic->ic_countryie_chan = ic->ic_bsschan;
1501 }
1502 return add_appie(frm, ic->ic_countryie);
1503}
1504
1505/*
1506 * Send a probe request frame with the specified ssid
1507 * and any optional information element data.
1508 */
1509int
1510ieee80211_send_probereq(struct ieee80211_node *ni,
1511 const uint8_t sa[IEEE80211_ADDR_LEN],
1512 const uint8_t da[IEEE80211_ADDR_LEN],
1513 const uint8_t bssid[IEEE80211_ADDR_LEN],
1514 const uint8_t *ssid, size_t ssidlen)
1515{
1516 struct ieee80211vap *vap = ni->ni_vap;
1517 struct ieee80211com *ic = ni->ni_ic;
1518 const struct ieee80211_txparam *tp;
1519 struct ieee80211_bpf_params params;
1520 struct ieee80211_frame *wh;
1521 const struct ieee80211_rateset *rs;
1522 struct mbuf *m;
1523 uint8_t *frm;
1524
1525 if (vap->iv_state == IEEE80211_S_CAC) {
1526 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
1527 "block %s frame in CAC state", "probe request");
1528 vap->iv_stats.is_tx_badstate++;
1529 return EIO; /* XXX */
1530 }
1531
1532 /*
1533 * Hold a reference on the node so it doesn't go away until after
1534 * the xmit is complete all the way in the driver. On error we
1535 * will remove our reference.
1536 */
1537 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1538 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1539 __func__, __LINE__,
1540 ni, ether_sprintf(ni->ni_macaddr),
1541 ieee80211_node_refcnt(ni)+1);
1542 ieee80211_ref_node(ni);
1543
1544 /*
1545 * prreq frame format
1546 * [tlv] ssid
1547 * [tlv] supported rates
1548 * [tlv] RSN (optional)
1549 * [tlv] extended supported rates
1550 * [tlv] WPA (optional)
1551 * [tlv] user-specified ie's
1552 */
1553 m = ieee80211_getmgtframe(&frm,
1554 ic->ic_headroom + sizeof(struct ieee80211_frame),
1555 2 + IEEE80211_NWID_LEN
1556 + 2 + IEEE80211_RATE_SIZE
1557 + sizeof(struct ieee80211_ie_wpa)
1558 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1559 + sizeof(struct ieee80211_ie_wpa)
1560 + (vap->iv_appie_probereq != NULL ?
1561 vap->iv_appie_probereq->ie_len : 0)
1562 );
1563 if (m == NULL) {
1564 vap->iv_stats.is_tx_nobuf++;
1565 ieee80211_free_node(ni);
1566 return ENOMEM;
1567 }
1568
1569 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
1570 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
1571 frm = ieee80211_add_rates(frm, rs);
1572 if (vap->iv_flags & IEEE80211_F_WPA2) {
1573 if (vap->iv_rsn_ie != NULL)
1574 frm = add_ie(frm, vap->iv_rsn_ie);
1575 /* XXX else complain? */
1576 }
1577 frm = ieee80211_add_xrates(frm, rs);
1578 if (vap->iv_flags & IEEE80211_F_WPA1) {
1579 if (vap->iv_wpa_ie != NULL)
1580 frm = add_ie(frm, vap->iv_wpa_ie);
1581 /* XXX else complain? */
1582 }
1583 if (vap->iv_appie_probereq != NULL)
1584 frm = add_appie(frm, vap->iv_appie_probereq);
1585 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1586
1587 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
1588 ("leading space %zd", M_LEADINGSPACE(m)));
1589 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
1590 if (m == NULL) {
1591 /* NB: cannot happen */
1592 ieee80211_free_node(ni);
1593 return ENOMEM;
1594 }
1595
1596 wh = mtod(m, struct ieee80211_frame *);
1597 ieee80211_send_setup(ni, m,
1598 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
1599 IEEE80211_NONQOS_TID, sa, da, bssid);
1600 /* XXX power management? */
1601 m->m_flags |= M_ENCAP; /* mark encapsulated */
1602
1603 M_WME_SETAC(m, WME_AC_BE);
1604
1605 IEEE80211_NODE_STAT(ni, tx_probereq);
1606 IEEE80211_NODE_STAT(ni, tx_mgmt);
1607
1608 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1609 "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
1610 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
1611 ssidlen, ssid);
1612
1613 memset(¶ms, 0, sizeof(params));
1614 params.ibp_pri = M_WME_GETAC(m);
1615 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
1616 params.ibp_rate0 = tp->mgmtrate;
1617 if (IEEE80211_IS_MULTICAST(da)) {
1618 params.ibp_flags |= IEEE80211_BPF_NOACK;
1619 params.ibp_try0 = 1;
1620 } else
1621 params.ibp_try0 = tp->maxretry;
1622 params.ibp_power = ni->ni_txpower;
1623 return ic->ic_raw_xmit(ni, m, ¶ms);
1624}
1625
1626/*
1627 * Calculate capability information for mgt frames.
1628 */
1629static uint16_t
1630getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
1631{
1632 struct ieee80211com *ic = vap->iv_ic;
1633 uint16_t capinfo;
1634
1635 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
1636
1637 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
1638 capinfo = IEEE80211_CAPINFO_ESS;
1639 else if (vap->iv_opmode == IEEE80211_M_IBSS)
1640 capinfo = IEEE80211_CAPINFO_IBSS;
1641 else
1642 capinfo = 0;
1643 if (vap->iv_flags & IEEE80211_F_PRIVACY)
1644 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1645 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1646 IEEE80211_IS_CHAN_2GHZ(chan))
1647 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1648 if (ic->ic_flags & IEEE80211_F_SHSLOT)
1649 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1650 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
1651 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
1652 return capinfo;
1653}
1654
1655/*
1656 * Send a management frame. The node is for the destination (or ic_bss
1657 * when in station mode). Nodes other than ic_bss have their reference
1658 * count bumped to reflect our use for an indeterminant time.
1659 */
1660int
1661ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
1662{
1663#define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
1664#define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
1665 struct ieee80211vap *vap = ni->ni_vap;
1666 struct ieee80211com *ic = ni->ni_ic;
1667 struct ieee80211_node *bss = vap->iv_bss;
1668 struct ieee80211_bpf_params params;
1669 struct mbuf *m;
1670 uint8_t *frm;
1671 uint16_t capinfo;
1672 int has_challenge, is_shared_key, ret, status;
1673
1674 KASSERT(ni != NULL, ("null node"));
1675
1676 /*
1677 * Hold a reference on the node so it doesn't go away until after
1678 * the xmit is complete all the way in the driver. On error we
1679 * will remove our reference.
1680 */
1681 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1682 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1683 __func__, __LINE__,
1684 ni, ether_sprintf(ni->ni_macaddr),
1685 ieee80211_node_refcnt(ni)+1);
1686 ieee80211_ref_node(ni);
1687
1688 memset(¶ms, 0, sizeof(params));
1689 switch (type) {
1690
1691 case IEEE80211_FC0_SUBTYPE_AUTH:
1692 status = arg >> 16;
1693 arg &= 0xffff;
1694 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
1695 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
1696 ni->ni_challenge != NULL);
1697
1698 /*
1699 * Deduce whether we're doing open authentication or
1700 * shared key authentication. We do the latter if
1701 * we're in the middle of a shared key authentication
1702 * handshake or if we're initiating an authentication
1703 * request and configured to use shared key.
1704 */
1705 is_shared_key = has_challenge ||
1706 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
1707 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
1708 bss->ni_authmode == IEEE80211_AUTH_SHARED);
1709
1710 m = ieee80211_getmgtframe(&frm,
1711 ic->ic_headroom + sizeof(struct ieee80211_frame),
1712 3 * sizeof(uint16_t)
1713 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
1714 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
1715 );
1716 if (m == NULL)
1717 senderr(ENOMEM, is_tx_nobuf);
1718
1719 ((uint16_t *)frm)[0] =
1720 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
1721 : htole16(IEEE80211_AUTH_ALG_OPEN);
1722 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
1723 ((uint16_t *)frm)[2] = htole16(status);/* status */
1724
1725 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
1726 ((uint16_t *)frm)[3] =
1727 htole16((IEEE80211_CHALLENGE_LEN << 8) |
1728 IEEE80211_ELEMID_CHALLENGE);
1729 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
1730 IEEE80211_CHALLENGE_LEN);
1731 m->m_pkthdr.len = m->m_len =
1732 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
1733 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
1734 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1735 "request encrypt frame (%s)", __func__);
1736 /* mark frame for encryption */
1737 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
1738 }
1739 } else
1740 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
1741
1742 /* XXX not right for shared key */
1743 if (status == IEEE80211_STATUS_SUCCESS)
1744 IEEE80211_NODE_STAT(ni, tx_auth);
1745 else
1746 IEEE80211_NODE_STAT(ni, tx_auth_fail);
1747
1748 if (vap->iv_opmode == IEEE80211_M_STA)
1749 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
1750 (void *) vap->iv_state);
1751 break;
1752
1753 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1754 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1755 "send station deauthenticate (reason %d)", arg);
1756 m = ieee80211_getmgtframe(&frm,
1757 ic->ic_headroom + sizeof(struct ieee80211_frame),
1758 sizeof(uint16_t));
1759 if (m == NULL)
1760 senderr(ENOMEM, is_tx_nobuf);
1761 *(uint16_t *)frm = htole16(arg); /* reason */
1762 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1763
1764 IEEE80211_NODE_STAT(ni, tx_deauth);
1765 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
1766
1767 ieee80211_node_unauthorize(ni); /* port closed */
1768 break;
1769
1770 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1771 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1772 /*
1773 * asreq frame format
1774 * [2] capability information
1775 * [2] listen interval
1776 * [6*] current AP address (reassoc only)
1777 * [tlv] ssid
1778 * [tlv] supported rates
1779 * [tlv] extended supported rates
1780 * [4] power capability (optional)
1781 * [28] supported channels (optional)
1782 * [tlv] HT capabilities
1783 * [tlv] WME (optional)
1784 * [tlv] Vendor OUI HT capabilities (optional)
1785 * [tlv] Atheros capabilities (if negotiated)
1786 * [tlv] AppIE's (optional)
1787 */
1788 m = ieee80211_getmgtframe(&frm,
1789 ic->ic_headroom + sizeof(struct ieee80211_frame),
1790 sizeof(uint16_t)
1791 + sizeof(uint16_t)
1792 + IEEE80211_ADDR_LEN
1793 + 2 + IEEE80211_NWID_LEN
1794 + 2 + IEEE80211_RATE_SIZE
1795 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1796 + 4
1797 + 2 + 26
1798 + sizeof(struct ieee80211_wme_info)
1799 + sizeof(struct ieee80211_ie_htcap)
1800 + 4 + sizeof(struct ieee80211_ie_htcap)
1801#ifdef IEEE80211_SUPPORT_SUPERG
1802 + sizeof(struct ieee80211_ath_ie)
1803#endif
1804 + (vap->iv_appie_wpa != NULL ?
1805 vap->iv_appie_wpa->ie_len : 0)
1806 + (vap->iv_appie_assocreq != NULL ?
1807 vap->iv_appie_assocreq->ie_len : 0)
1808 );
1809 if (m == NULL)
1810 senderr(ENOMEM, is_tx_nobuf);
1811
1812 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
1813 ("wrong mode %u", vap->iv_opmode));
1814 capinfo = IEEE80211_CAPINFO_ESS;
1815 if (vap->iv_flags & IEEE80211_F_PRIVACY)
1816 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1817 /*
1818 * NB: Some 11a AP's reject the request when
1819 * short premable is set.
1820 */
1821 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1822 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
1823 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1824 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
1825 (ic->ic_caps & IEEE80211_C_SHSLOT))
1826 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1827 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
1828 (vap->iv_flags & IEEE80211_F_DOTH))
1829 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
1830 *(uint16_t *)frm = htole16(capinfo);
1831 frm += 2;
1832
1833 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
1834 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
1835 bss->ni_intval));
1836 frm += 2;
1837
1838 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1839 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
1840 frm += IEEE80211_ADDR_LEN;
1841 }
1842
1843 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1844 frm = ieee80211_add_rates(frm, &ni->ni_rates);
1845 if (vap->iv_flags & IEEE80211_F_WPA2) {
1846 if (vap->iv_rsn_ie != NULL)
1847 frm = add_ie(frm, vap->iv_rsn_ie);
1848 /* XXX else complain? */
1849 }
1850 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
1851 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
1852 frm = ieee80211_add_powercapability(frm,
1853 ic->ic_curchan);
1854 frm = ieee80211_add_supportedchannels(frm, ic);
1855 }
|
2431 frm = ieee80211_add_htcap_vendor(frm, ni);
2432 frm = ieee80211_add_htinfo_vendor(frm, ni);
2433 }
2434#ifdef IEEE80211_SUPPORT_SUPERG
2435 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
2436 bo->bo_ath = frm;
2437 frm = ieee80211_add_athcaps(frm, ni);
2438 }
2439#endif
2440#ifdef IEEE80211_SUPPORT_TDMA
2441 if (vap->iv_caps & IEEE80211_C_TDMA) {
2442 bo->bo_tdma = frm;
2443 frm = ieee80211_add_tdma(frm, vap);
2444 }
2445#endif
2446 if (vap->iv_appie_beacon != NULL) {
2447 bo->bo_appie = frm;
2448 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
2449 frm = add_appie(frm, vap->iv_appie_beacon);
2450 }
2451 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
2452 bo->bo_csa_trailer_len = frm - bo->bo_csa;
2453 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2454}
2455
2456/*
2457 * Allocate a beacon frame and fillin the appropriate bits.
2458 */
2459struct mbuf *
2460ieee80211_beacon_alloc(struct ieee80211_node *ni,
2461 struct ieee80211_beacon_offsets *bo)
2462{
2463 struct ieee80211vap *vap = ni->ni_vap;
2464 struct ieee80211com *ic = ni->ni_ic;
2465 struct ifnet *ifp = vap->iv_ifp;
2466 struct ieee80211_frame *wh;
2467 struct mbuf *m;
2468 int pktlen;
2469 uint8_t *frm;
2470
2471 /*
2472 * beacon frame format
2473 * [8] time stamp
2474 * [2] beacon interval
2475 * [2] cabability information
2476 * [tlv] ssid
2477 * [tlv] supported rates
2478 * [3] parameter set (DS)
2479 * [8] CF parameter set (optional)
2480 * [tlv] parameter set (IBSS/TIM)
2481 * [tlv] country (optional)
2482 * [3] power control (optional)
2483 * [5] channel switch announcement (CSA) (optional)
2484 * [tlv] extended rate phy (ERP)
2485 * [tlv] extended supported rates
2486 * [tlv] RSN parameters
2487 * [tlv] HT capabilities
2488 * [tlv] HT information
2489 * [tlv] Vendor OUI HT capabilities (optional)
2490 * [tlv] Vendor OUI HT information (optional)
2491 * XXX Vendor-specific OIDs (e.g. Atheros)
2492 * [tlv] WPA parameters
2493 * [tlv] WME parameters
2494 * [tlv] TDMA parameters (optional)
2495 * [tlv] application data (optional)
2496 * NB: we allocate the max space required for the TIM bitmap.
2497 * XXX how big is this?
2498 */
2499 pktlen = 8 /* time stamp */
2500 + sizeof(uint16_t) /* beacon interval */
2501 + sizeof(uint16_t) /* capabilities */
2502 + 2 + ni->ni_esslen /* ssid */
2503 + 2 + IEEE80211_RATE_SIZE /* supported rates */
2504 + 2 + 1 /* DS parameters */
2505 + 2 + 6 /* CF parameters */
2506 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
2507 + IEEE80211_COUNTRY_MAX_SIZE /* country */
2508 + 2 + 1 /* power control */
2509 + sizeof(struct ieee80211_csa_ie) /* CSA */
2510 + 2 + 1 /* ERP */
2511 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2512 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
2513 2*sizeof(struct ieee80211_ie_wpa) : 0)
2514 /* XXX conditional? */
2515 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
2516 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
2517 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
2518 sizeof(struct ieee80211_wme_param) : 0)
2519#ifdef IEEE80211_SUPPORT_SUPERG
2520 + sizeof(struct ieee80211_ath_ie) /* ATH */
2521#endif
2522#ifdef IEEE80211_SUPPORT_TDMA
2523 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
2524 sizeof(struct ieee80211_tdma_param) : 0)
2525#endif
2526 + IEEE80211_MAX_APPIE
2527 ;
2528 m = ieee80211_getmgtframe(&frm,
2529 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
2530 if (m == NULL) {
2531 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
2532 "%s: cannot get buf; size %u\n", __func__, pktlen);
2533 vap->iv_stats.is_tx_nobuf++;
2534 return NULL;
2535 }
2536 ieee80211_beacon_construct(m, frm, bo, ni);
2537
2538 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
2539 KASSERT(m != NULL, ("no space for 802.11 header?"));
2540 wh = mtod(m, struct ieee80211_frame *);
2541 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
2542 IEEE80211_FC0_SUBTYPE_BEACON;
2543 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2544 *(uint16_t *)wh->i_dur = 0;
2545 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
2546 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
2547 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
2548 *(uint16_t *)wh->i_seq = 0;
2549
2550 return m;
2551}
2552
2553/*
2554 * Update the dynamic parts of a beacon frame based on the current state.
2555 */
2556int
2557ieee80211_beacon_update(struct ieee80211_node *ni,
2558 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
2559{
2560 struct ieee80211vap *vap = ni->ni_vap;
2561 struct ieee80211com *ic = ni->ni_ic;
2562 int len_changed = 0;
2563 uint16_t capinfo;
2564
2565 IEEE80211_LOCK(ic);
2566 /*
2567 * Handle 11h channel change when we've reached the count.
2568 * We must recalculate the beacon frame contents to account
2569 * for the new channel. Note we do this only for the first
2570 * vap that reaches this point; subsequent vaps just update
2571 * their beacon state to reflect the recalculated channel.
2572 */
2573 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
2574 vap->iv_csa_count == ic->ic_csa_count) {
2575 vap->iv_csa_count = 0;
2576 /*
2577 * Effect channel change before reconstructing the beacon
2578 * frame contents as many places reference ni_chan.
2579 */
2580 if (ic->ic_csa_newchan != NULL)
2581 ieee80211_csa_completeswitch(ic);
2582 /*
2583 * NB: ieee80211_beacon_construct clears all pending
2584 * updates in bo_flags so we don't need to explicitly
2585 * clear IEEE80211_BEACON_CSA.
2586 */
2587 ieee80211_beacon_construct(m,
2588 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni);
2589
2590 /* XXX do WME aggressive mode processing? */
2591 IEEE80211_UNLOCK(ic);
2592 return 1; /* just assume length changed */
2593 }
2594
2595 /* XXX faster to recalculate entirely or just changes? */
2596 capinfo = getcapinfo(vap, ni->ni_chan);
2597 *bo->bo_caps = htole16(capinfo);
2598
2599 if (vap->iv_flags & IEEE80211_F_WME) {
2600 struct ieee80211_wme_state *wme = &ic->ic_wme;
2601
2602 /*
2603 * Check for agressive mode change. When there is
2604 * significant high priority traffic in the BSS
2605 * throttle back BE traffic by using conservative
2606 * parameters. Otherwise BE uses agressive params
2607 * to optimize performance of legacy/non-QoS traffic.
2608 */
2609 if (wme->wme_flags & WME_F_AGGRMODE) {
2610 if (wme->wme_hipri_traffic >
2611 wme->wme_hipri_switch_thresh) {
2612 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2613 "%s: traffic %u, disable aggressive mode\n",
2614 __func__, wme->wme_hipri_traffic);
2615 wme->wme_flags &= ~WME_F_AGGRMODE;
2616 ieee80211_wme_updateparams_locked(vap);
2617 wme->wme_hipri_traffic =
2618 wme->wme_hipri_switch_hysteresis;
2619 } else
2620 wme->wme_hipri_traffic = 0;
2621 } else {
2622 if (wme->wme_hipri_traffic <=
2623 wme->wme_hipri_switch_thresh) {
2624 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2625 "%s: traffic %u, enable aggressive mode\n",
2626 __func__, wme->wme_hipri_traffic);
2627 wme->wme_flags |= WME_F_AGGRMODE;
2628 ieee80211_wme_updateparams_locked(vap);
2629 wme->wme_hipri_traffic = 0;
2630 } else
2631 wme->wme_hipri_traffic =
2632 wme->wme_hipri_switch_hysteresis;
2633 }
2634 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
2635 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
2636 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
2637 }
2638 }
2639
2640 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
2641 ieee80211_ht_update_beacon(vap, bo);
2642 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
2643 }
2644#ifdef IEEE80211_SUPPORT_TDMA
2645 if (vap->iv_caps & IEEE80211_C_TDMA) {
2646 /*
2647 * NB: the beacon is potentially updated every TBTT.
2648 */
2649 ieee80211_tdma_update_beacon(vap, bo);
2650 }
2651#endif
2652 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/
2653 struct ieee80211_tim_ie *tie =
2654 (struct ieee80211_tim_ie *) bo->bo_tim;
2655 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
2656 u_int timlen, timoff, i;
2657 /*
2658 * ATIM/DTIM needs updating. If it fits in the
2659 * current space allocated then just copy in the
2660 * new bits. Otherwise we need to move any trailing
2661 * data to make room. Note that we know there is
2662 * contiguous space because ieee80211_beacon_allocate
2663 * insures there is space in the mbuf to write a
2664 * maximal-size virtual bitmap (based on iv_max_aid).
2665 */
2666 /*
2667 * Calculate the bitmap size and offset, copy any
2668 * trailer out of the way, and then copy in the
2669 * new bitmap and update the information element.
2670 * Note that the tim bitmap must contain at least
2671 * one byte and any offset must be even.
2672 */
2673 if (vap->iv_ps_pending != 0) {
2674 timoff = 128; /* impossibly large */
2675 for (i = 0; i < vap->iv_tim_len; i++)
2676 if (vap->iv_tim_bitmap[i]) {
2677 timoff = i &~ 1;
2678 break;
2679 }
2680 KASSERT(timoff != 128, ("tim bitmap empty!"));
2681 for (i = vap->iv_tim_len-1; i >= timoff; i--)
2682 if (vap->iv_tim_bitmap[i])
2683 break;
2684 timlen = 1 + (i - timoff);
2685 } else {
2686 timoff = 0;
2687 timlen = 1;
2688 }
2689 if (timlen != bo->bo_tim_len) {
2690 /* copy up/down trailer */
2691 int adjust = tie->tim_bitmap+timlen
2692 - bo->bo_tim_trailer;
2693 ovbcopy(bo->bo_tim_trailer,
2694 bo->bo_tim_trailer+adjust,
2695 bo->bo_tim_trailer_len);
2696 bo->bo_tim_trailer += adjust;
2697 bo->bo_erp += adjust;
2698 bo->bo_htinfo += adjust;
2699#ifdef IEEE80211_SUPERG_SUPPORT
2700 bo->bo_ath += adjust;
2701#endif
2702#ifdef IEEE80211_TDMA_SUPPORT
2703 bo->bo_tdma += adjust;
2704#endif
2705 bo->bo_appie += adjust;
2706 bo->bo_wme += adjust;
2707 bo->bo_csa += adjust;
2708 bo->bo_tim_len = timlen;
2709
2710 /* update information element */
2711 tie->tim_len = 3 + timlen;
2712 tie->tim_bitctl = timoff;
2713 len_changed = 1;
2714 }
2715 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
2716 bo->bo_tim_len);
2717
2718 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
2719
2720 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
2721 "%s: TIM updated, pending %u, off %u, len %u\n",
2722 __func__, vap->iv_ps_pending, timoff, timlen);
2723 }
2724 /* count down DTIM period */
2725 if (tie->tim_count == 0)
2726 tie->tim_count = tie->tim_period - 1;
2727 else
2728 tie->tim_count--;
2729 /* update state for buffered multicast frames on DTIM */
2730 if (mcast && tie->tim_count == 0)
2731 tie->tim_bitctl |= 1;
2732 else
2733 tie->tim_bitctl &= ~1;
2734 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
2735 struct ieee80211_csa_ie *csa =
2736 (struct ieee80211_csa_ie *) bo->bo_csa;
2737
2738 /*
2739 * Insert or update CSA ie. If we're just starting
2740 * to count down to the channel switch then we need
2741 * to insert the CSA ie. Otherwise we just need to
2742 * drop the count. The actual change happens above
2743 * when the vap's count reaches the target count.
2744 */
2745 if (vap->iv_csa_count == 0) {
2746 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
2747 bo->bo_erp += sizeof(*csa);
2748 bo->bo_htinfo += sizeof(*csa);
2749 bo->bo_wme += sizeof(*csa);
2750#ifdef IEEE80211_SUPERG_SUPPORT
2751 bo->bo_ath += sizeof(*csa);
2752#endif
2753#ifdef IEEE80211_TDMA_SUPPORT
2754 bo->bo_tdma += sizeof(*csa);
2755#endif
2756 bo->bo_appie += sizeof(*csa);
2757 bo->bo_csa_trailer_len += sizeof(*csa);
2758 bo->bo_tim_trailer_len += sizeof(*csa);
2759 m->m_len += sizeof(*csa);
2760 m->m_pkthdr.len += sizeof(*csa);
2761
2762 ieee80211_add_csa(bo->bo_csa, vap);
2763 } else
2764 csa->csa_count--;
2765 vap->iv_csa_count++;
2766 /* NB: don't clear IEEE80211_BEACON_CSA */
2767 }
2768 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
2769 /*
2770 * ERP element needs updating.
2771 */
2772 (void) ieee80211_add_erp(bo->bo_erp, ic);
2773 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
2774 }
2775#ifdef IEEE80211_SUPPORT_SUPERG
2776 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
2777 ieee80211_add_athcaps(bo->bo_ath, ni);
2778 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
2779 }
2780#endif
2781 }
2782 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
2783 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
2784 int aielen;
2785 uint8_t *frm;
2786
2787 aielen = 0;
2788 if (aie != NULL)
2789 aielen += aie->ie_len;
2790 if (aielen != bo->bo_appie_len) {
2791 /* copy up/down trailer */
2792 int adjust = aielen - bo->bo_appie_len;
2793 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
2794 bo->bo_tim_trailer_len);
2795 bo->bo_tim_trailer += adjust;
2796 bo->bo_appie += adjust;
2797 bo->bo_appie_len = aielen;
2798
2799 len_changed = 1;
2800 }
2801 frm = bo->bo_appie;
2802 if (aie != NULL)
2803 frm = add_appie(frm, aie);
2804 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
2805 }
2806 IEEE80211_UNLOCK(ic);
2807
2808 return len_changed;
2809}
| 2431 frm = ieee80211_add_htcap_vendor(frm, ni);
2432 frm = ieee80211_add_htinfo_vendor(frm, ni);
2433 }
2434#ifdef IEEE80211_SUPPORT_SUPERG
2435 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
2436 bo->bo_ath = frm;
2437 frm = ieee80211_add_athcaps(frm, ni);
2438 }
2439#endif
2440#ifdef IEEE80211_SUPPORT_TDMA
2441 if (vap->iv_caps & IEEE80211_C_TDMA) {
2442 bo->bo_tdma = frm;
2443 frm = ieee80211_add_tdma(frm, vap);
2444 }
2445#endif
2446 if (vap->iv_appie_beacon != NULL) {
2447 bo->bo_appie = frm;
2448 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
2449 frm = add_appie(frm, vap->iv_appie_beacon);
2450 }
2451 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
2452 bo->bo_csa_trailer_len = frm - bo->bo_csa;
2453 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2454}
2455
2456/*
2457 * Allocate a beacon frame and fillin the appropriate bits.
2458 */
2459struct mbuf *
2460ieee80211_beacon_alloc(struct ieee80211_node *ni,
2461 struct ieee80211_beacon_offsets *bo)
2462{
2463 struct ieee80211vap *vap = ni->ni_vap;
2464 struct ieee80211com *ic = ni->ni_ic;
2465 struct ifnet *ifp = vap->iv_ifp;
2466 struct ieee80211_frame *wh;
2467 struct mbuf *m;
2468 int pktlen;
2469 uint8_t *frm;
2470
2471 /*
2472 * beacon frame format
2473 * [8] time stamp
2474 * [2] beacon interval
2475 * [2] cabability information
2476 * [tlv] ssid
2477 * [tlv] supported rates
2478 * [3] parameter set (DS)
2479 * [8] CF parameter set (optional)
2480 * [tlv] parameter set (IBSS/TIM)
2481 * [tlv] country (optional)
2482 * [3] power control (optional)
2483 * [5] channel switch announcement (CSA) (optional)
2484 * [tlv] extended rate phy (ERP)
2485 * [tlv] extended supported rates
2486 * [tlv] RSN parameters
2487 * [tlv] HT capabilities
2488 * [tlv] HT information
2489 * [tlv] Vendor OUI HT capabilities (optional)
2490 * [tlv] Vendor OUI HT information (optional)
2491 * XXX Vendor-specific OIDs (e.g. Atheros)
2492 * [tlv] WPA parameters
2493 * [tlv] WME parameters
2494 * [tlv] TDMA parameters (optional)
2495 * [tlv] application data (optional)
2496 * NB: we allocate the max space required for the TIM bitmap.
2497 * XXX how big is this?
2498 */
2499 pktlen = 8 /* time stamp */
2500 + sizeof(uint16_t) /* beacon interval */
2501 + sizeof(uint16_t) /* capabilities */
2502 + 2 + ni->ni_esslen /* ssid */
2503 + 2 + IEEE80211_RATE_SIZE /* supported rates */
2504 + 2 + 1 /* DS parameters */
2505 + 2 + 6 /* CF parameters */
2506 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
2507 + IEEE80211_COUNTRY_MAX_SIZE /* country */
2508 + 2 + 1 /* power control */
2509 + sizeof(struct ieee80211_csa_ie) /* CSA */
2510 + 2 + 1 /* ERP */
2511 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2512 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
2513 2*sizeof(struct ieee80211_ie_wpa) : 0)
2514 /* XXX conditional? */
2515 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
2516 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
2517 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
2518 sizeof(struct ieee80211_wme_param) : 0)
2519#ifdef IEEE80211_SUPPORT_SUPERG
2520 + sizeof(struct ieee80211_ath_ie) /* ATH */
2521#endif
2522#ifdef IEEE80211_SUPPORT_TDMA
2523 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
2524 sizeof(struct ieee80211_tdma_param) : 0)
2525#endif
2526 + IEEE80211_MAX_APPIE
2527 ;
2528 m = ieee80211_getmgtframe(&frm,
2529 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
2530 if (m == NULL) {
2531 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
2532 "%s: cannot get buf; size %u\n", __func__, pktlen);
2533 vap->iv_stats.is_tx_nobuf++;
2534 return NULL;
2535 }
2536 ieee80211_beacon_construct(m, frm, bo, ni);
2537
2538 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
2539 KASSERT(m != NULL, ("no space for 802.11 header?"));
2540 wh = mtod(m, struct ieee80211_frame *);
2541 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
2542 IEEE80211_FC0_SUBTYPE_BEACON;
2543 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2544 *(uint16_t *)wh->i_dur = 0;
2545 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
2546 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
2547 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
2548 *(uint16_t *)wh->i_seq = 0;
2549
2550 return m;
2551}
2552
2553/*
2554 * Update the dynamic parts of a beacon frame based on the current state.
2555 */
2556int
2557ieee80211_beacon_update(struct ieee80211_node *ni,
2558 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
2559{
2560 struct ieee80211vap *vap = ni->ni_vap;
2561 struct ieee80211com *ic = ni->ni_ic;
2562 int len_changed = 0;
2563 uint16_t capinfo;
2564
2565 IEEE80211_LOCK(ic);
2566 /*
2567 * Handle 11h channel change when we've reached the count.
2568 * We must recalculate the beacon frame contents to account
2569 * for the new channel. Note we do this only for the first
2570 * vap that reaches this point; subsequent vaps just update
2571 * their beacon state to reflect the recalculated channel.
2572 */
2573 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
2574 vap->iv_csa_count == ic->ic_csa_count) {
2575 vap->iv_csa_count = 0;
2576 /*
2577 * Effect channel change before reconstructing the beacon
2578 * frame contents as many places reference ni_chan.
2579 */
2580 if (ic->ic_csa_newchan != NULL)
2581 ieee80211_csa_completeswitch(ic);
2582 /*
2583 * NB: ieee80211_beacon_construct clears all pending
2584 * updates in bo_flags so we don't need to explicitly
2585 * clear IEEE80211_BEACON_CSA.
2586 */
2587 ieee80211_beacon_construct(m,
2588 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni);
2589
2590 /* XXX do WME aggressive mode processing? */
2591 IEEE80211_UNLOCK(ic);
2592 return 1; /* just assume length changed */
2593 }
2594
2595 /* XXX faster to recalculate entirely or just changes? */
2596 capinfo = getcapinfo(vap, ni->ni_chan);
2597 *bo->bo_caps = htole16(capinfo);
2598
2599 if (vap->iv_flags & IEEE80211_F_WME) {
2600 struct ieee80211_wme_state *wme = &ic->ic_wme;
2601
2602 /*
2603 * Check for agressive mode change. When there is
2604 * significant high priority traffic in the BSS
2605 * throttle back BE traffic by using conservative
2606 * parameters. Otherwise BE uses agressive params
2607 * to optimize performance of legacy/non-QoS traffic.
2608 */
2609 if (wme->wme_flags & WME_F_AGGRMODE) {
2610 if (wme->wme_hipri_traffic >
2611 wme->wme_hipri_switch_thresh) {
2612 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2613 "%s: traffic %u, disable aggressive mode\n",
2614 __func__, wme->wme_hipri_traffic);
2615 wme->wme_flags &= ~WME_F_AGGRMODE;
2616 ieee80211_wme_updateparams_locked(vap);
2617 wme->wme_hipri_traffic =
2618 wme->wme_hipri_switch_hysteresis;
2619 } else
2620 wme->wme_hipri_traffic = 0;
2621 } else {
2622 if (wme->wme_hipri_traffic <=
2623 wme->wme_hipri_switch_thresh) {
2624 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2625 "%s: traffic %u, enable aggressive mode\n",
2626 __func__, wme->wme_hipri_traffic);
2627 wme->wme_flags |= WME_F_AGGRMODE;
2628 ieee80211_wme_updateparams_locked(vap);
2629 wme->wme_hipri_traffic = 0;
2630 } else
2631 wme->wme_hipri_traffic =
2632 wme->wme_hipri_switch_hysteresis;
2633 }
2634 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
2635 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
2636 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
2637 }
2638 }
2639
2640 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
2641 ieee80211_ht_update_beacon(vap, bo);
2642 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
2643 }
2644#ifdef IEEE80211_SUPPORT_TDMA
2645 if (vap->iv_caps & IEEE80211_C_TDMA) {
2646 /*
2647 * NB: the beacon is potentially updated every TBTT.
2648 */
2649 ieee80211_tdma_update_beacon(vap, bo);
2650 }
2651#endif
2652 if (vap->iv_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/
2653 struct ieee80211_tim_ie *tie =
2654 (struct ieee80211_tim_ie *) bo->bo_tim;
2655 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
2656 u_int timlen, timoff, i;
2657 /*
2658 * ATIM/DTIM needs updating. If it fits in the
2659 * current space allocated then just copy in the
2660 * new bits. Otherwise we need to move any trailing
2661 * data to make room. Note that we know there is
2662 * contiguous space because ieee80211_beacon_allocate
2663 * insures there is space in the mbuf to write a
2664 * maximal-size virtual bitmap (based on iv_max_aid).
2665 */
2666 /*
2667 * Calculate the bitmap size and offset, copy any
2668 * trailer out of the way, and then copy in the
2669 * new bitmap and update the information element.
2670 * Note that the tim bitmap must contain at least
2671 * one byte and any offset must be even.
2672 */
2673 if (vap->iv_ps_pending != 0) {
2674 timoff = 128; /* impossibly large */
2675 for (i = 0; i < vap->iv_tim_len; i++)
2676 if (vap->iv_tim_bitmap[i]) {
2677 timoff = i &~ 1;
2678 break;
2679 }
2680 KASSERT(timoff != 128, ("tim bitmap empty!"));
2681 for (i = vap->iv_tim_len-1; i >= timoff; i--)
2682 if (vap->iv_tim_bitmap[i])
2683 break;
2684 timlen = 1 + (i - timoff);
2685 } else {
2686 timoff = 0;
2687 timlen = 1;
2688 }
2689 if (timlen != bo->bo_tim_len) {
2690 /* copy up/down trailer */
2691 int adjust = tie->tim_bitmap+timlen
2692 - bo->bo_tim_trailer;
2693 ovbcopy(bo->bo_tim_trailer,
2694 bo->bo_tim_trailer+adjust,
2695 bo->bo_tim_trailer_len);
2696 bo->bo_tim_trailer += adjust;
2697 bo->bo_erp += adjust;
2698 bo->bo_htinfo += adjust;
2699#ifdef IEEE80211_SUPERG_SUPPORT
2700 bo->bo_ath += adjust;
2701#endif
2702#ifdef IEEE80211_TDMA_SUPPORT
2703 bo->bo_tdma += adjust;
2704#endif
2705 bo->bo_appie += adjust;
2706 bo->bo_wme += adjust;
2707 bo->bo_csa += adjust;
2708 bo->bo_tim_len = timlen;
2709
2710 /* update information element */
2711 tie->tim_len = 3 + timlen;
2712 tie->tim_bitctl = timoff;
2713 len_changed = 1;
2714 }
2715 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
2716 bo->bo_tim_len);
2717
2718 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
2719
2720 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
2721 "%s: TIM updated, pending %u, off %u, len %u\n",
2722 __func__, vap->iv_ps_pending, timoff, timlen);
2723 }
2724 /* count down DTIM period */
2725 if (tie->tim_count == 0)
2726 tie->tim_count = tie->tim_period - 1;
2727 else
2728 tie->tim_count--;
2729 /* update state for buffered multicast frames on DTIM */
2730 if (mcast && tie->tim_count == 0)
2731 tie->tim_bitctl |= 1;
2732 else
2733 tie->tim_bitctl &= ~1;
2734 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
2735 struct ieee80211_csa_ie *csa =
2736 (struct ieee80211_csa_ie *) bo->bo_csa;
2737
2738 /*
2739 * Insert or update CSA ie. If we're just starting
2740 * to count down to the channel switch then we need
2741 * to insert the CSA ie. Otherwise we just need to
2742 * drop the count. The actual change happens above
2743 * when the vap's count reaches the target count.
2744 */
2745 if (vap->iv_csa_count == 0) {
2746 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
2747 bo->bo_erp += sizeof(*csa);
2748 bo->bo_htinfo += sizeof(*csa);
2749 bo->bo_wme += sizeof(*csa);
2750#ifdef IEEE80211_SUPERG_SUPPORT
2751 bo->bo_ath += sizeof(*csa);
2752#endif
2753#ifdef IEEE80211_TDMA_SUPPORT
2754 bo->bo_tdma += sizeof(*csa);
2755#endif
2756 bo->bo_appie += sizeof(*csa);
2757 bo->bo_csa_trailer_len += sizeof(*csa);
2758 bo->bo_tim_trailer_len += sizeof(*csa);
2759 m->m_len += sizeof(*csa);
2760 m->m_pkthdr.len += sizeof(*csa);
2761
2762 ieee80211_add_csa(bo->bo_csa, vap);
2763 } else
2764 csa->csa_count--;
2765 vap->iv_csa_count++;
2766 /* NB: don't clear IEEE80211_BEACON_CSA */
2767 }
2768 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
2769 /*
2770 * ERP element needs updating.
2771 */
2772 (void) ieee80211_add_erp(bo->bo_erp, ic);
2773 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
2774 }
2775#ifdef IEEE80211_SUPPORT_SUPERG
2776 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
2777 ieee80211_add_athcaps(bo->bo_ath, ni);
2778 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
2779 }
2780#endif
2781 }
2782 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
2783 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
2784 int aielen;
2785 uint8_t *frm;
2786
2787 aielen = 0;
2788 if (aie != NULL)
2789 aielen += aie->ie_len;
2790 if (aielen != bo->bo_appie_len) {
2791 /* copy up/down trailer */
2792 int adjust = aielen - bo->bo_appie_len;
2793 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
2794 bo->bo_tim_trailer_len);
2795 bo->bo_tim_trailer += adjust;
2796 bo->bo_appie += adjust;
2797 bo->bo_appie_len = aielen;
2798
2799 len_changed = 1;
2800 }
2801 frm = bo->bo_appie;
2802 if (aie != NULL)
2803 frm = add_appie(frm, aie);
2804 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
2805 }
2806 IEEE80211_UNLOCK(ic);
2807
2808 return len_changed;
2809}
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