The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_superg.c

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    1 /*-
    2  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/10.0/sys/net80211/ieee80211_superg.c 254900 2013-08-26 09:52:05Z adrian $");
   28 
   29 #include "opt_wlan.h"
   30 
   31 #ifdef  IEEE80211_SUPPORT_SUPERG
   32 
   33 #include <sys/param.h>
   34 #include <sys/systm.h> 
   35 #include <sys/mbuf.h>   
   36 #include <sys/kernel.h>
   37 #include <sys/endian.h>
   38 
   39 #include <sys/socket.h>
   40  
   41 #include <net/bpf.h>
   42 #include <net/ethernet.h>
   43 #include <net/if.h>
   44 #include <net/if_llc.h>
   45 #include <net/if_media.h>
   46 
   47 #include <net80211/ieee80211_var.h>
   48 #include <net80211/ieee80211_input.h>
   49 #include <net80211/ieee80211_phy.h>
   50 #include <net80211/ieee80211_superg.h>
   51 
   52 /*
   53  * Atheros fast-frame encapsulation format.
   54  * FF max payload:
   55  * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
   56  *   8   +   4   +  4   +   14  +   8   + 1500 +  6   +   14  +   8   + 1500
   57  * = 3066
   58  */
   59 /* fast frame header is 32-bits */
   60 #define ATH_FF_PROTO    0x0000003f      /* protocol */
   61 #define ATH_FF_PROTO_S  0
   62 #define ATH_FF_FTYPE    0x000000c0      /* frame type */
   63 #define ATH_FF_FTYPE_S  6
   64 #define ATH_FF_HLEN32   0x00000300      /* optional hdr length */
   65 #define ATH_FF_HLEN32_S 8
   66 #define ATH_FF_SEQNUM   0x001ffc00      /* sequence number */
   67 #define ATH_FF_SEQNUM_S 10
   68 #define ATH_FF_OFFSET   0xffe00000      /* offset to 2nd payload */
   69 #define ATH_FF_OFFSET_S 21
   70 
   71 #define ATH_FF_MAX_HDR_PAD      4
   72 #define ATH_FF_MAX_SEP_PAD      6
   73 #define ATH_FF_MAX_HDR          30
   74 
   75 #define ATH_FF_PROTO_L2TUNNEL   0       /* L2 tunnel protocol */
   76 #define ATH_FF_ETH_TYPE         0x88bd  /* Ether type for encapsulated frames */
   77 #define ATH_FF_SNAP_ORGCODE_0   0x00
   78 #define ATH_FF_SNAP_ORGCODE_1   0x03
   79 #define ATH_FF_SNAP_ORGCODE_2   0x7f
   80 
   81 #define ATH_FF_TXQMIN   2               /* min txq depth for staging */
   82 #define ATH_FF_TXQMAX   50              /* maximum # of queued frames allowed */
   83 #define ATH_FF_STAGEMAX 5               /* max waiting period for staged frame*/
   84 
   85 #define ETHER_HEADER_COPY(dst, src) \
   86         memcpy(dst, src, sizeof(struct ether_header))
   87 
   88 static  int ieee80211_ffppsmin = 2;     /* pps threshold for ff aggregation */
   89 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLTYPE_INT | CTLFLAG_RW,
   90         &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging");
   91 static  int ieee80211_ffagemax = -1;    /* max time frames held on stage q */
   92 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW,
   93         &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I",
   94         "max hold time for fast-frame staging (ms)");
   95 
   96 void
   97 ieee80211_superg_attach(struct ieee80211com *ic)
   98 {
   99         struct ieee80211_superg *sg;
  100 
  101         if (ic->ic_caps & IEEE80211_C_FF) {
  102                 sg = (struct ieee80211_superg *) malloc(
  103                      sizeof(struct ieee80211_superg), M_80211_VAP,
  104                      M_NOWAIT | M_ZERO);
  105                 if (sg == NULL) {
  106                         printf("%s: cannot allocate SuperG state block\n",
  107                             __func__);
  108                         return;
  109                 }
  110                 ic->ic_superg = sg;
  111         }
  112         ieee80211_ffagemax = msecs_to_ticks(150);
  113 }
  114 
  115 void
  116 ieee80211_superg_detach(struct ieee80211com *ic)
  117 {
  118         if (ic->ic_superg != NULL) {
  119                 free(ic->ic_superg, M_80211_VAP);
  120                 ic->ic_superg = NULL;
  121         }
  122 }
  123 
  124 void
  125 ieee80211_superg_vattach(struct ieee80211vap *vap)
  126 {
  127         struct ieee80211com *ic = vap->iv_ic;
  128 
  129         if (ic->ic_superg == NULL)      /* NB: can't do fast-frames w/o state */
  130                 vap->iv_caps &= ~IEEE80211_C_FF;
  131         if (vap->iv_caps & IEEE80211_C_FF)
  132                 vap->iv_flags |= IEEE80211_F_FF;
  133         /* NB: we only implement sta mode */
  134         if (vap->iv_opmode == IEEE80211_M_STA &&
  135             (vap->iv_caps & IEEE80211_C_TURBOP))
  136                 vap->iv_flags |= IEEE80211_F_TURBOP;
  137 }
  138 
  139 void
  140 ieee80211_superg_vdetach(struct ieee80211vap *vap)
  141 {
  142 }
  143 
  144 #define ATH_OUI_BYTES           0x00, 0x03, 0x7f
  145 /*
  146  * Add a WME information element to a frame.
  147  */
  148 uint8_t *
  149 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
  150 {
  151         static const struct ieee80211_ath_ie info = {
  152                 .ath_id         = IEEE80211_ELEMID_VENDOR,
  153                 .ath_len        = sizeof(struct ieee80211_ath_ie) - 2,
  154                 .ath_oui        = { ATH_OUI_BYTES },
  155                 .ath_oui_type   = ATH_OUI_TYPE,
  156                 .ath_oui_subtype= ATH_OUI_SUBTYPE,
  157                 .ath_version    = ATH_OUI_VERSION,
  158         };
  159         struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
  160 
  161         memcpy(frm, &info, sizeof(info));
  162         ath->ath_capability = caps;
  163         if (defkeyix != IEEE80211_KEYIX_NONE) {
  164                 ath->ath_defkeyix[0] = (defkeyix & 0xff);
  165                 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
  166         } else {
  167                 ath->ath_defkeyix[0] = 0xff;
  168                 ath->ath_defkeyix[1] = 0x7f;
  169         }
  170         return frm + sizeof(info); 
  171 }
  172 #undef ATH_OUI_BYTES
  173 
  174 uint8_t *
  175 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
  176 {
  177         const struct ieee80211vap *vap = bss->ni_vap;
  178 
  179         return ieee80211_add_ath(frm,
  180             vap->iv_flags & IEEE80211_F_ATHEROS,
  181             ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
  182             bss->ni_authmode != IEEE80211_AUTH_8021X) ?
  183             vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
  184 }
  185 
  186 void
  187 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
  188 {
  189         const struct ieee80211_ath_ie *ath =
  190                 (const struct ieee80211_ath_ie *) ie;
  191 
  192         ni->ni_ath_flags = ath->ath_capability;
  193         ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix);
  194 }
  195 
  196 int
  197 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
  198         const struct ieee80211_frame *wh)
  199 {
  200         struct ieee80211vap *vap = ni->ni_vap;
  201         const struct ieee80211_ath_ie *ath;
  202         u_int len = frm[1];
  203         int capschanged;
  204         uint16_t defkeyix;
  205 
  206         if (len < sizeof(struct ieee80211_ath_ie)-2) {
  207                 IEEE80211_DISCARD_IE(vap,
  208                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
  209                     wh, "Atheros", "too short, len %u", len);
  210                 return -1;
  211         }
  212         ath = (const struct ieee80211_ath_ie *)frm;
  213         capschanged = (ni->ni_ath_flags != ath->ath_capability);
  214         defkeyix = LE_READ_2(ath->ath_defkeyix);
  215         if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
  216                 ni->ni_ath_flags = ath->ath_capability;
  217                 ni->ni_ath_defkeyix = defkeyix;
  218                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  219                     "ath ie change: new caps 0x%x defkeyix 0x%x",
  220                     ni->ni_ath_flags, ni->ni_ath_defkeyix);
  221         }
  222         if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
  223                 uint16_t curflags, newflags;
  224 
  225                 /*
  226                  * Check for turbo mode switch.  Calculate flags
  227                  * for the new mode and effect the switch.
  228                  */
  229                 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
  230                 /* NB: BOOST is not in ic_flags, so get it from the ie */
  231                 if (ath->ath_capability & ATHEROS_CAP_BOOST) 
  232                         newflags |= IEEE80211_CHAN_TURBO;
  233                 else
  234                         newflags &= ~IEEE80211_CHAN_TURBO;
  235                 if (newflags != curflags)
  236                         ieee80211_dturbo_switch(vap, newflags);
  237         }
  238         return capschanged;
  239 }
  240 
  241 /*
  242  * Decap the encapsulated frame pair and dispatch the first
  243  * for delivery.  The second frame is returned for delivery
  244  * via the normal path.
  245  */
  246 struct mbuf *
  247 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
  248 {
  249 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
  250 #define MS(x,f) (((x) & f) >> f##_S)
  251         struct ieee80211vap *vap = ni->ni_vap;
  252         struct llc *llc;
  253         uint32_t ath;
  254         struct mbuf *n;
  255         int framelen;
  256 
  257         /* NB: we assume caller does this check for us */
  258         KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
  259             ("ff not negotiated"));
  260         /*
  261          * Check for fast-frame tunnel encapsulation.
  262          */
  263         if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
  264                 return m;
  265         if (m->m_len < FF_LLC_SIZE &&
  266             (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
  267                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  268                     ni->ni_macaddr, "fast-frame",
  269                     "%s", "m_pullup(llc) failed");
  270                 vap->iv_stats.is_rx_tooshort++;
  271                 return NULL;
  272         }
  273         llc = (struct llc *)(mtod(m, uint8_t *) +
  274             sizeof(struct ether_header));
  275         if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
  276                 return m;
  277         m_adj(m, FF_LLC_SIZE);
  278         m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
  279         if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
  280                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  281                     ni->ni_macaddr, "fast-frame",
  282                     "unsupport tunnel protocol, header 0x%x", ath);
  283                 vap->iv_stats.is_ff_badhdr++;
  284                 m_freem(m);
  285                 return NULL;
  286         }
  287         /* NB: skip header and alignment padding */
  288         m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
  289 
  290         vap->iv_stats.is_ff_decap++;
  291 
  292         /*
  293          * Decap the first frame, bust it apart from the
  294          * second and deliver; then decap the second frame
  295          * and return it to the caller for normal delivery.
  296          */
  297         m = ieee80211_decap1(m, &framelen);
  298         if (m == NULL) {
  299                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  300                     ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
  301                 vap->iv_stats.is_ff_tooshort++;
  302                 return NULL;
  303         }
  304         n = m_split(m, framelen, M_NOWAIT);
  305         if (n == NULL) {
  306                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  307                     ni->ni_macaddr, "fast-frame",
  308                     "%s", "unable to split encapsulated frames");
  309                 vap->iv_stats.is_ff_split++;
  310                 m_freem(m);                     /* NB: must reclaim */
  311                 return NULL;
  312         }
  313         /* XXX not right for WDS */
  314         vap->iv_deliver_data(vap, ni, m);       /* 1st of pair */
  315 
  316         /*
  317          * Decap second frame.
  318          */
  319         m_adj(n, roundup2(framelen, 4) - framelen);     /* padding */
  320         n = ieee80211_decap1(n, &framelen);
  321         if (n == NULL) {
  322                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  323                     ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
  324                 vap->iv_stats.is_ff_tooshort++;
  325         }
  326         /* XXX verify framelen against mbuf contents */
  327         return n;                               /* 2nd delivered by caller */
  328 #undef MS
  329 #undef FF_LLC_SIZE
  330 }
  331 
  332 /*
  333  * Fast frame encapsulation.  There must be two packets
  334  * chained with m_nextpkt.  We do header adjustment for
  335  * each, add the tunnel encapsulation, and then concatenate
  336  * the mbuf chains to form a single frame for transmission.
  337  */
  338 struct mbuf *
  339 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
  340         struct ieee80211_key *key)
  341 {
  342         struct mbuf *m2;
  343         struct ether_header eh1, eh2;
  344         struct llc *llc;
  345         struct mbuf *m;
  346         int pad;
  347 
  348         m2 = m1->m_nextpkt;
  349         if (m2 == NULL) {
  350                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  351                     "%s: only one frame\n", __func__);
  352                 goto bad;
  353         }
  354         m1->m_nextpkt = NULL;
  355         /*
  356          * Include fast frame headers in adjusting header layout.
  357          */
  358         KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
  359         ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
  360         m1 = ieee80211_mbuf_adjust(vap,
  361                 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 +
  362                     sizeof(struct ether_header),
  363                 key, m1);
  364         if (m1 == NULL) {
  365                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  366                 m_freem(m2);
  367                 goto bad;
  368         }
  369 
  370         /*
  371          * Copy second frame's Ethernet header out of line
  372          * and adjust for encapsulation headers.  Note that
  373          * we make room for padding in case there isn't room
  374          * at the end of first frame.
  375          */
  376         KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
  377         ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
  378         m2 = ieee80211_mbuf_adjust(vap,
  379                 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header),
  380                 NULL, m2);
  381         if (m2 == NULL) {
  382                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  383                 goto bad;
  384         }
  385 
  386         /*
  387          * Now do tunnel encapsulation.  First, each
  388          * frame gets a standard encapsulation.
  389          */
  390         m1 = ieee80211_ff_encap1(vap, m1, &eh1);
  391         if (m1 == NULL)
  392                 goto bad;
  393         m2 = ieee80211_ff_encap1(vap, m2, &eh2);
  394         if (m2 == NULL)
  395                 goto bad;
  396 
  397         /*
  398          * Pad leading frame to a 4-byte boundary.  If there
  399          * is space at the end of the first frame, put it
  400          * there; otherwise prepend to the front of the second
  401          * frame.  We know doing the second will always work
  402          * because we reserve space above.  We prefer appending
  403          * as this typically has better DMA alignment properties.
  404          */
  405         for (m = m1; m->m_next != NULL; m = m->m_next)
  406                 ;
  407         pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
  408         if (pad) {
  409                 if (M_TRAILINGSPACE(m) < pad) {         /* prepend to second */
  410                         m2->m_data -= pad;
  411                         m2->m_len += pad;
  412                         m2->m_pkthdr.len += pad;
  413                 } else {                                /* append to first */
  414                         m->m_len += pad;
  415                         m1->m_pkthdr.len += pad;
  416                 }
  417         }
  418 
  419         /*
  420          * Now, stick 'em together and prepend the tunnel headers;
  421          * first the Atheros tunnel header (all zero for now) and
  422          * then a special fast frame LLC.
  423          *
  424          * XXX optimize by prepending together
  425          */
  426         m->m_next = m2;                 /* NB: last mbuf from above */
  427         m1->m_pkthdr.len += m2->m_pkthdr.len;
  428         M_PREPEND(m1, sizeof(uint32_t)+2, M_NOWAIT);
  429         if (m1 == NULL) {               /* XXX cannot happen */
  430                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  431                     "%s: no space for tunnel header\n", __func__);
  432                 vap->iv_stats.is_tx_nobuf++;
  433                 return NULL;
  434         }
  435         memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
  436 
  437         M_PREPEND(m1, sizeof(struct llc), M_NOWAIT);
  438         if (m1 == NULL) {               /* XXX cannot happen */
  439                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  440                     "%s: no space for llc header\n", __func__);
  441                 vap->iv_stats.is_tx_nobuf++;
  442                 return NULL;
  443         }
  444         llc = mtod(m1, struct llc *);
  445         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  446         llc->llc_control = LLC_UI;
  447         llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
  448         llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
  449         llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
  450         llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
  451 
  452         vap->iv_stats.is_ff_encap++;
  453 
  454         return m1;
  455 bad:
  456         if (m1 != NULL)
  457                 m_freem(m1);
  458         if (m2 != NULL)
  459                 m_freem(m2);
  460         return NULL;
  461 }
  462 
  463 static void
  464 ff_transmit(struct ieee80211_node *ni, struct mbuf *m)
  465 {
  466         struct ieee80211vap *vap = ni->ni_vap;
  467         struct ieee80211com *ic = ni->ni_ic;
  468         int error;
  469 
  470         IEEE80211_TX_LOCK_ASSERT(vap->iv_ic);
  471 
  472         /* encap and xmit */
  473         m = ieee80211_encap(vap, ni, m);
  474         if (m != NULL) {
  475                 struct ifnet *ifp = vap->iv_ifp;
  476 
  477                 error = ieee80211_parent_xmitpkt(ic, m);;
  478                 if (error != 0) {
  479                         /* NB: IFQ_HANDOFF reclaims mbuf */
  480                         ieee80211_free_node(ni);
  481                 } else {
  482                         ifp->if_opackets++;
  483                 }
  484         } else
  485                 ieee80211_free_node(ni);
  486 }
  487 
  488 /*
  489  * Flush frames to device; note we re-use the linked list
  490  * the frames were stored on and use the sentinel (unchanged)
  491  * which may be non-NULL.
  492  */
  493 static void
  494 ff_flush(struct mbuf *head, struct mbuf *last)
  495 {
  496         struct mbuf *m, *next;
  497         struct ieee80211_node *ni;
  498         struct ieee80211vap *vap;
  499 
  500         for (m = head; m != last; m = next) {
  501                 next = m->m_nextpkt;
  502                 m->m_nextpkt = NULL;
  503 
  504                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  505                 vap = ni->ni_vap;
  506 
  507                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  508                     "%s: flush frame, age %u", __func__, M_AGE_GET(m));
  509                 vap->iv_stats.is_ff_flush++;
  510 
  511                 ff_transmit(ni, m);
  512         }
  513 }
  514 
  515 /*
  516  * Age frames on the staging queue.
  517  *
  518  * This is called without the comlock held, but it does all its work
  519  * behind the comlock.  Because of this, it's possible that the
  520  * staging queue will be serviced between the function which called
  521  * it and now; thus simply checking that the queue has work in it
  522  * may fail.
  523  *
  524  * See PR kern/174283 for more details.
  525  */
  526 void
  527 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq,
  528     int quanta)
  529 {
  530         struct mbuf *m, *head;
  531         struct ieee80211_node *ni;
  532         struct ieee80211_tx_ampdu *tap;
  533 
  534 #if 0
  535         KASSERT(sq->head != NULL, ("stageq empty"));
  536 #endif
  537 
  538         IEEE80211_LOCK(ic);
  539         head = sq->head;
  540         while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) {
  541                 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
  542 
  543                 /* clear tap ref to frame */
  544                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  545                 tap = &ni->ni_tx_ampdu[tid];
  546                 KASSERT(tap->txa_private == m, ("staging queue empty"));
  547                 tap->txa_private = NULL;
  548 
  549                 sq->head = m->m_nextpkt;
  550                 sq->depth--;
  551         }
  552         if (m == NULL)
  553                 sq->tail = NULL;
  554         else
  555                 M_AGE_SUB(m, quanta);
  556         IEEE80211_UNLOCK(ic);
  557 
  558         IEEE80211_TX_LOCK(ic);
  559         ff_flush(head, m);
  560         IEEE80211_TX_UNLOCK(ic);
  561 }
  562 
  563 static void
  564 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m)
  565 {
  566         int age = ieee80211_ffagemax;
  567 
  568         IEEE80211_LOCK_ASSERT(ic);
  569 
  570         if (sq->tail != NULL) {
  571                 sq->tail->m_nextpkt = m;
  572                 age -= M_AGE_GET(sq->head);
  573         } else
  574                 sq->head = m;
  575         KASSERT(age >= 0, ("age %d", age));
  576         M_AGE_SET(m, age);
  577         m->m_nextpkt = NULL;
  578         sq->tail = m;
  579         sq->depth++;
  580 }
  581 
  582 static void
  583 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged)
  584 {
  585         struct mbuf *m, *mprev;
  586 
  587         IEEE80211_LOCK_ASSERT(ic);
  588 
  589         mprev = NULL;
  590         for (m = sq->head; m != NULL; m = m->m_nextpkt) {
  591                 if (m == mstaged) {
  592                         if (mprev == NULL)
  593                                 sq->head = m->m_nextpkt;
  594                         else
  595                                 mprev->m_nextpkt = m->m_nextpkt;
  596                         if (sq->tail == m)
  597                                 sq->tail = mprev;
  598                         sq->depth--;
  599                         return;
  600                 }
  601                 mprev = m;
  602         }
  603         printf("%s: packet not found\n", __func__);
  604 }
  605 
  606 static uint32_t
  607 ff_approx_txtime(struct ieee80211_node *ni,
  608         const struct mbuf *m1, const struct mbuf *m2)
  609 {
  610         struct ieee80211com *ic = ni->ni_ic;
  611         struct ieee80211vap *vap = ni->ni_vap;
  612         uint32_t framelen;
  613 
  614         /*
  615          * Approximate the frame length to be transmitted. A swag to add
  616          * the following maximal values to the skb payload:
  617          *   - 32: 802.11 encap + CRC
  618          *   - 24: encryption overhead (if wep bit)
  619          *   - 4 + 6: fast-frame header and padding
  620          *   - 16: 2 LLC FF tunnel headers
  621          *   - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd)
  622          */
  623         framelen = m1->m_pkthdr.len + 32 +
  624             ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR;
  625         if (vap->iv_flags & IEEE80211_F_PRIVACY)
  626                 framelen += 24;
  627         if (m2 != NULL)
  628                 framelen += m2->m_pkthdr.len;
  629         return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0);
  630 }
  631 
  632 /*
  633  * Check if the supplied frame can be partnered with an existing
  634  * or pending frame.  Return a reference to any frame that should be
  635  * sent on return; otherwise return NULL.
  636  */
  637 struct mbuf *
  638 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m)
  639 {
  640         struct ieee80211vap *vap = ni->ni_vap;
  641         struct ieee80211com *ic = ni->ni_ic;
  642         struct ieee80211_superg *sg = ic->ic_superg;
  643         const int pri = M_WME_GETAC(m);
  644         struct ieee80211_stageq *sq;
  645         struct ieee80211_tx_ampdu *tap;
  646         struct mbuf *mstaged;
  647         uint32_t txtime, limit;
  648 
  649         IEEE80211_TX_UNLOCK_ASSERT(ic);
  650 
  651         /*
  652          * Check if the supplied frame can be aggregated.
  653          *
  654          * NB: we allow EAPOL frames to be aggregated with other ucast traffic.
  655          *     Do 802.1x EAPOL frames proceed in the clear? Then they couldn't
  656          *     be aggregated with other types of frames when encryption is on?
  657          */
  658         IEEE80211_LOCK(ic);
  659         tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)];
  660         mstaged = tap->txa_private;             /* NB: we reuse AMPDU state */
  661         ieee80211_txampdu_count_packet(tap);
  662 
  663         /*
  664          * When not in station mode never aggregate a multicast
  665          * frame; this insures, for example, that a combined frame
  666          * does not require multiple encryption keys.
  667          */
  668         if (vap->iv_opmode != IEEE80211_M_STA &&
  669             ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) {
  670                 /* XXX flush staged frame? */
  671                 IEEE80211_UNLOCK(ic);
  672                 return m;
  673         }
  674         /*
  675          * If there is no frame to combine with and the pps is
  676          * too low; then do not attempt to aggregate this frame.
  677          */
  678         if (mstaged == NULL &&
  679             ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) {
  680                 IEEE80211_UNLOCK(ic);
  681                 return m;
  682         }
  683         sq = &sg->ff_stageq[pri];
  684         /*
  685          * Check the txop limit to insure the aggregate fits.
  686          */
  687         limit = IEEE80211_TXOP_TO_US(
  688                 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit);
  689         if (limit != 0 &&
  690             (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) {
  691                 /*
  692                  * Aggregate too long, return to the caller for direct
  693                  * transmission.  In addition, flush any pending frame
  694                  * before sending this one.
  695                  */
  696                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  697                     "%s: txtime %u exceeds txop limit %u\n",
  698                     __func__, txtime, limit);
  699 
  700                 tap->txa_private = NULL;
  701                 if (mstaged != NULL)
  702                         stageq_remove(ic, sq, mstaged);
  703                 IEEE80211_UNLOCK(ic);
  704 
  705                 if (mstaged != NULL) {
  706                         IEEE80211_TX_LOCK(ic);
  707                         IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  708                             "%s: flush staged frame", __func__);
  709                         /* encap and xmit */
  710                         ff_transmit(ni, mstaged);
  711                         IEEE80211_TX_UNLOCK(ic);
  712                 }
  713                 return m;               /* NB: original frame */
  714         }
  715         /*
  716          * An aggregation candidate.  If there's a frame to partner
  717          * with then combine and return for processing.  Otherwise
  718          * save this frame and wait for a partner to show up (or
  719          * the frame to be flushed).  Note that staged frames also
  720          * hold their node reference.
  721          */
  722         if (mstaged != NULL) {
  723                 tap->txa_private = NULL;
  724                 stageq_remove(ic, sq, mstaged);
  725                 IEEE80211_UNLOCK(ic);
  726 
  727                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  728                     "%s: aggregate fast-frame", __func__);
  729                 /*
  730                  * Release the node reference; we only need
  731                  * the one already in mstaged.
  732                  */
  733                 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni,
  734                     ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni));
  735                 ieee80211_free_node(ni);
  736 
  737                 m->m_nextpkt = NULL;
  738                 mstaged->m_nextpkt = m;
  739                 mstaged->m_flags |= M_FF; /* NB: mark for encap work */
  740         } else {
  741                 KASSERT(tap->txa_private == NULL,
  742                     ("txa_private %p", tap->txa_private));
  743                 tap->txa_private = m;
  744 
  745                 stageq_add(ic, sq, m);
  746                 IEEE80211_UNLOCK(ic);
  747 
  748                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  749                     "%s: stage frame, %u queued", __func__, sq->depth);
  750                 /* NB: mstaged is NULL */
  751         }
  752         return mstaged;
  753 }
  754 
  755 void
  756 ieee80211_ff_node_init(struct ieee80211_node *ni)
  757 {
  758         /*
  759          * Clean FF state on re-associate.  This handles the case
  760          * where a station leaves w/o notifying us and then returns
  761          * before node is reaped for inactivity.
  762          */
  763         ieee80211_ff_node_cleanup(ni);
  764 }
  765 
  766 void
  767 ieee80211_ff_node_cleanup(struct ieee80211_node *ni)
  768 {
  769         struct ieee80211com *ic = ni->ni_ic;
  770         struct ieee80211_superg *sg = ic->ic_superg;
  771         struct ieee80211_tx_ampdu *tap;
  772         struct mbuf *m, *next_m, *head;
  773         int tid;
  774 
  775         IEEE80211_LOCK(ic);
  776         head = NULL;
  777         for (tid = 0; tid < WME_NUM_TID; tid++) {
  778                 int ac = TID_TO_WME_AC(tid);
  779 
  780                 tap = &ni->ni_tx_ampdu[tid];
  781                 m = tap->txa_private;
  782                 if (m != NULL) {
  783                         tap->txa_private = NULL;
  784                         stageq_remove(ic, &sg->ff_stageq[ac], m);
  785                         m->m_nextpkt = head;
  786                         head = m;
  787                 }
  788         }
  789         IEEE80211_UNLOCK(ic);
  790 
  791         /*
  792          * Free mbufs, taking care to not dereference the mbuf after
  793          * we free it (hence grabbing m_nextpkt before we free it.)
  794          */
  795         m = head;
  796         while (m != NULL) {
  797                 next_m = m->m_nextpkt;
  798                 m_freem(m);
  799                 ieee80211_free_node(ni);
  800                 m = next_m;
  801         }
  802 }
  803 
  804 /*
  805  * Switch between turbo and non-turbo operating modes.
  806  * Use the specified channel flags to locate the new
  807  * channel, update 802.11 state, and then call back into
  808  * the driver to effect the change.
  809  */
  810 void
  811 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
  812 {
  813         struct ieee80211com *ic = vap->iv_ic;
  814         struct ieee80211_channel *chan;
  815 
  816         chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
  817         if (chan == NULL) {             /* XXX should not happen */
  818                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  819                     "%s: no channel with freq %u flags 0x%x\n",
  820                     __func__, ic->ic_bsschan->ic_freq, newflags);
  821                 return;
  822         }
  823 
  824         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  825             "%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
  826             ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
  827             ieee80211_phymode_name[ieee80211_chan2mode(chan)],
  828             chan->ic_freq, chan->ic_flags);
  829 
  830         ic->ic_bsschan = chan;
  831         ic->ic_prevchan = ic->ic_curchan;
  832         ic->ic_curchan = chan;
  833         ic->ic_rt = ieee80211_get_ratetable(chan);
  834         ic->ic_set_channel(ic);
  835         ieee80211_radiotap_chan_change(ic);
  836         /* NB: do not need to reset ERP state 'cuz we're in sta mode */
  837 }
  838 
  839 /*
  840  * Return the current ``state'' of an Atheros capbility.
  841  * If associated in station mode report the negotiated
  842  * setting. Otherwise report the current setting.
  843  */
  844 static int
  845 getathcap(struct ieee80211vap *vap, int cap)
  846 {
  847         if (vap->iv_opmode == IEEE80211_M_STA &&
  848             vap->iv_state == IEEE80211_S_RUN)
  849                 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
  850         else
  851                 return (vap->iv_flags & cap) != 0;
  852 }
  853 
  854 static int
  855 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
  856 {
  857         switch (ireq->i_type) {
  858         case IEEE80211_IOC_FF:
  859                 ireq->i_val = getathcap(vap, IEEE80211_F_FF);
  860                 break;
  861         case IEEE80211_IOC_TURBOP:
  862                 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
  863                 break;
  864         default:
  865                 return ENOSYS;
  866         }
  867         return 0;
  868 }
  869 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
  870 
  871 static int
  872 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
  873 {
  874         switch (ireq->i_type) {
  875         case IEEE80211_IOC_FF:
  876                 if (ireq->i_val) {
  877                         if ((vap->iv_caps & IEEE80211_C_FF) == 0)
  878                                 return EOPNOTSUPP;
  879                         vap->iv_flags |= IEEE80211_F_FF;
  880                 } else
  881                         vap->iv_flags &= ~IEEE80211_F_FF;
  882                 return ENETRESET;
  883         case IEEE80211_IOC_TURBOP:
  884                 if (ireq->i_val) {
  885                         if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
  886                                 return EOPNOTSUPP;
  887                         vap->iv_flags |= IEEE80211_F_TURBOP;
  888                 } else
  889                         vap->iv_flags &= ~IEEE80211_F_TURBOP;
  890                 return ENETRESET;
  891         default:
  892                 return ENOSYS;
  893         }
  894         return 0;
  895 }
  896 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);
  897 
  898 #endif  /* IEEE80211_SUPPORT_SUPERG */

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