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/9.1/sys/net80211/ieee80211_superg.c 193115 2009-05-30 20:11:23Z sam $");
   28 
   29 #include "opt_wlan.h"
   30 
   31 #include <sys/param.h>
   32 #include <sys/systm.h> 
   33 #include <sys/mbuf.h>   
   34 #include <sys/kernel.h>
   35 #include <sys/endian.h>
   36 
   37 #include <sys/socket.h>
   38  
   39 #include <net/bpf.h>
   40 #include <net/ethernet.h>
   41 #include <net/if.h>
   42 #include <net/if_llc.h>
   43 #include <net/if_media.h>
   44 
   45 #include <net80211/ieee80211_var.h>
   46 #include <net80211/ieee80211_input.h>
   47 #include <net80211/ieee80211_phy.h>
   48 #include <net80211/ieee80211_superg.h>
   49 
   50 /*
   51  * Atheros fast-frame encapsulation format.
   52  * FF max payload:
   53  * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
   54  *   8   +   4   +  4   +   14  +   8   + 1500 +  6   +   14  +   8   + 1500
   55  * = 3066
   56  */
   57 /* fast frame header is 32-bits */
   58 #define ATH_FF_PROTO    0x0000003f      /* protocol */
   59 #define ATH_FF_PROTO_S  0
   60 #define ATH_FF_FTYPE    0x000000c0      /* frame type */
   61 #define ATH_FF_FTYPE_S  6
   62 #define ATH_FF_HLEN32   0x00000300      /* optional hdr length */
   63 #define ATH_FF_HLEN32_S 8
   64 #define ATH_FF_SEQNUM   0x001ffc00      /* sequence number */
   65 #define ATH_FF_SEQNUM_S 10
   66 #define ATH_FF_OFFSET   0xffe00000      /* offset to 2nd payload */
   67 #define ATH_FF_OFFSET_S 21
   68 
   69 #define ATH_FF_MAX_HDR_PAD      4
   70 #define ATH_FF_MAX_SEP_PAD      6
   71 #define ATH_FF_MAX_HDR          30
   72 
   73 #define ATH_FF_PROTO_L2TUNNEL   0       /* L2 tunnel protocol */
   74 #define ATH_FF_ETH_TYPE         0x88bd  /* Ether type for encapsulated frames */
   75 #define ATH_FF_SNAP_ORGCODE_0   0x00
   76 #define ATH_FF_SNAP_ORGCODE_1   0x03
   77 #define ATH_FF_SNAP_ORGCODE_2   0x7f
   78 
   79 #define ATH_FF_TXQMIN   2               /* min txq depth for staging */
   80 #define ATH_FF_TXQMAX   50              /* maximum # of queued frames allowed */
   81 #define ATH_FF_STAGEMAX 5               /* max waiting period for staged frame*/
   82 
   83 #define ETHER_HEADER_COPY(dst, src) \
   84         memcpy(dst, src, sizeof(struct ether_header))
   85 
   86 static  int ieee80211_ffppsmin = 2;     /* pps threshold for ff aggregation */
   87 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLTYPE_INT | CTLFLAG_RW,
   88         &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging");
   89 static  int ieee80211_ffagemax = -1;    /* max time frames held on stage q */
   90 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW,
   91         &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I",
   92         "max hold time for fast-frame staging (ms)");
   93 
   94 void
   95 ieee80211_superg_attach(struct ieee80211com *ic)
   96 {
   97         struct ieee80211_superg *sg;
   98 
   99         if (ic->ic_caps & IEEE80211_C_FF) {
  100                 sg = (struct ieee80211_superg *) malloc(
  101                      sizeof(struct ieee80211_superg), M_80211_VAP,
  102                      M_NOWAIT | M_ZERO);
  103                 if (sg == NULL) {
  104                         printf("%s: cannot allocate SuperG state block\n",
  105                             __func__);
  106                         return;
  107                 }
  108                 ic->ic_superg = sg;
  109         }
  110         ieee80211_ffagemax = msecs_to_ticks(150);
  111 }
  112 
  113 void
  114 ieee80211_superg_detach(struct ieee80211com *ic)
  115 {
  116         if (ic->ic_superg != NULL) {
  117                 free(ic->ic_superg, M_80211_VAP);
  118                 ic->ic_superg = NULL;
  119         }
  120 }
  121 
  122 void
  123 ieee80211_superg_vattach(struct ieee80211vap *vap)
  124 {
  125         struct ieee80211com *ic = vap->iv_ic;
  126 
  127         if (ic->ic_superg == NULL)      /* NB: can't do fast-frames w/o state */
  128                 vap->iv_caps &= ~IEEE80211_C_FF;
  129         if (vap->iv_caps & IEEE80211_C_FF)
  130                 vap->iv_flags |= IEEE80211_F_FF;
  131         /* NB: we only implement sta mode */
  132         if (vap->iv_opmode == IEEE80211_M_STA &&
  133             (vap->iv_caps & IEEE80211_C_TURBOP))
  134                 vap->iv_flags |= IEEE80211_F_TURBOP;
  135 }
  136 
  137 void
  138 ieee80211_superg_vdetach(struct ieee80211vap *vap)
  139 {
  140 }
  141 
  142 #define ATH_OUI_BYTES           0x00, 0x03, 0x7f
  143 /*
  144  * Add a WME information element to a frame.
  145  */
  146 uint8_t *
  147 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
  148 {
  149         static const struct ieee80211_ath_ie info = {
  150                 .ath_id         = IEEE80211_ELEMID_VENDOR,
  151                 .ath_len        = sizeof(struct ieee80211_ath_ie) - 2,
  152                 .ath_oui        = { ATH_OUI_BYTES },
  153                 .ath_oui_type   = ATH_OUI_TYPE,
  154                 .ath_oui_subtype= ATH_OUI_SUBTYPE,
  155                 .ath_version    = ATH_OUI_VERSION,
  156         };
  157         struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
  158 
  159         memcpy(frm, &info, sizeof(info));
  160         ath->ath_capability = caps;
  161         if (defkeyix != IEEE80211_KEYIX_NONE) {
  162                 ath->ath_defkeyix[0] = (defkeyix & 0xff);
  163                 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
  164         } else {
  165                 ath->ath_defkeyix[0] = 0xff;
  166                 ath->ath_defkeyix[1] = 0x7f;
  167         }
  168         return frm + sizeof(info); 
  169 }
  170 #undef ATH_OUI_BYTES
  171 
  172 uint8_t *
  173 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
  174 {
  175         const struct ieee80211vap *vap = bss->ni_vap;
  176 
  177         return ieee80211_add_ath(frm,
  178             vap->iv_flags & IEEE80211_F_ATHEROS,
  179             ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
  180             bss->ni_authmode != IEEE80211_AUTH_8021X) ?
  181             vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
  182 }
  183 
  184 void
  185 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
  186 {
  187         const struct ieee80211_ath_ie *ath =
  188                 (const struct ieee80211_ath_ie *) ie;
  189 
  190         ni->ni_ath_flags = ath->ath_capability;
  191         ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix);
  192 }
  193 
  194 int
  195 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
  196         const struct ieee80211_frame *wh)
  197 {
  198         struct ieee80211vap *vap = ni->ni_vap;
  199         const struct ieee80211_ath_ie *ath;
  200         u_int len = frm[1];
  201         int capschanged;
  202         uint16_t defkeyix;
  203 
  204         if (len < sizeof(struct ieee80211_ath_ie)-2) {
  205                 IEEE80211_DISCARD_IE(vap,
  206                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
  207                     wh, "Atheros", "too short, len %u", len);
  208                 return -1;
  209         }
  210         ath = (const struct ieee80211_ath_ie *)frm;
  211         capschanged = (ni->ni_ath_flags != ath->ath_capability);
  212         defkeyix = LE_READ_2(ath->ath_defkeyix);
  213         if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
  214                 ni->ni_ath_flags = ath->ath_capability;
  215                 ni->ni_ath_defkeyix = defkeyix;
  216                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  217                     "ath ie change: new caps 0x%x defkeyix 0x%x",
  218                     ni->ni_ath_flags, ni->ni_ath_defkeyix);
  219         }
  220         if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
  221                 uint16_t curflags, newflags;
  222 
  223                 /*
  224                  * Check for turbo mode switch.  Calculate flags
  225                  * for the new mode and effect the switch.
  226                  */
  227                 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
  228                 /* NB: BOOST is not in ic_flags, so get it from the ie */
  229                 if (ath->ath_capability & ATHEROS_CAP_BOOST) 
  230                         newflags |= IEEE80211_CHAN_TURBO;
  231                 else
  232                         newflags &= ~IEEE80211_CHAN_TURBO;
  233                 if (newflags != curflags)
  234                         ieee80211_dturbo_switch(vap, newflags);
  235         }
  236         return capschanged;
  237 }
  238 
  239 /*
  240  * Decap the encapsulated frame pair and dispatch the first
  241  * for delivery.  The second frame is returned for delivery
  242  * via the normal path.
  243  */
  244 struct mbuf *
  245 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
  246 {
  247 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
  248 #define MS(x,f) (((x) & f) >> f##_S)
  249         struct ieee80211vap *vap = ni->ni_vap;
  250         struct llc *llc;
  251         uint32_t ath;
  252         struct mbuf *n;
  253         int framelen;
  254 
  255         /* NB: we assume caller does this check for us */
  256         KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
  257             ("ff not negotiated"));
  258         /*
  259          * Check for fast-frame tunnel encapsulation.
  260          */
  261         if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
  262                 return m;
  263         if (m->m_len < FF_LLC_SIZE &&
  264             (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
  265                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  266                     ni->ni_macaddr, "fast-frame",
  267                     "%s", "m_pullup(llc) failed");
  268                 vap->iv_stats.is_rx_tooshort++;
  269                 return NULL;
  270         }
  271         llc = (struct llc *)(mtod(m, uint8_t *) +
  272             sizeof(struct ether_header));
  273         if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
  274                 return m;
  275         m_adj(m, FF_LLC_SIZE);
  276         m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
  277         if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
  278                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  279                     ni->ni_macaddr, "fast-frame",
  280                     "unsupport tunnel protocol, header 0x%x", ath);
  281                 vap->iv_stats.is_ff_badhdr++;
  282                 m_freem(m);
  283                 return NULL;
  284         }
  285         /* NB: skip header and alignment padding */
  286         m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
  287 
  288         vap->iv_stats.is_ff_decap++;
  289 
  290         /*
  291          * Decap the first frame, bust it apart from the
  292          * second and deliver; then decap the second frame
  293          * and return it to the caller for normal delivery.
  294          */
  295         m = ieee80211_decap1(m, &framelen);
  296         if (m == NULL) {
  297                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  298                     ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
  299                 vap->iv_stats.is_ff_tooshort++;
  300                 return NULL;
  301         }
  302         n = m_split(m, framelen, M_NOWAIT);
  303         if (n == NULL) {
  304                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  305                     ni->ni_macaddr, "fast-frame",
  306                     "%s", "unable to split encapsulated frames");
  307                 vap->iv_stats.is_ff_split++;
  308                 m_freem(m);                     /* NB: must reclaim */
  309                 return NULL;
  310         }
  311         /* XXX not right for WDS */
  312         vap->iv_deliver_data(vap, ni, m);       /* 1st of pair */
  313 
  314         /*
  315          * Decap second frame.
  316          */
  317         m_adj(n, roundup2(framelen, 4) - framelen);     /* padding */
  318         n = ieee80211_decap1(n, &framelen);
  319         if (n == NULL) {
  320                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  321                     ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
  322                 vap->iv_stats.is_ff_tooshort++;
  323         }
  324         /* XXX verify framelen against mbuf contents */
  325         return n;                               /* 2nd delivered by caller */
  326 #undef MS
  327 #undef FF_LLC_SIZE
  328 }
  329 
  330 /*
  331  * Do Ethernet-LLC encapsulation for each payload in a fast frame
  332  * tunnel encapsulation.  The frame is assumed to have an Ethernet
  333  * header at the front that must be stripped before prepending the
  334  * LLC followed by the Ethernet header passed in (with an Ethernet
  335  * type that specifies the payload size).
  336  */
  337 static struct mbuf *
  338 ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
  339         const struct ether_header *eh)
  340 {
  341         struct llc *llc;
  342         uint16_t payload;
  343 
  344         /* XXX optimize by combining m_adj+M_PREPEND */
  345         m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
  346         llc = mtod(m, struct llc *);
  347         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  348         llc->llc_control = LLC_UI;
  349         llc->llc_snap.org_code[0] = 0;
  350         llc->llc_snap.org_code[1] = 0;
  351         llc->llc_snap.org_code[2] = 0;
  352         llc->llc_snap.ether_type = eh->ether_type;
  353         payload = m->m_pkthdr.len;              /* NB: w/o Ethernet header */
  354 
  355         M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT);
  356         if (m == NULL) {                /* XXX cannot happen */
  357                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  358                         "%s: no space for ether_header\n", __func__);
  359                 vap->iv_stats.is_tx_nobuf++;
  360                 return NULL;
  361         }
  362         ETHER_HEADER_COPY(mtod(m, void *), eh);
  363         mtod(m, struct ether_header *)->ether_type = htons(payload);
  364         return m;
  365 }
  366 
  367 /*
  368  * Fast frame encapsulation.  There must be two packets
  369  * chained with m_nextpkt.  We do header adjustment for
  370  * each, add the tunnel encapsulation, and then concatenate
  371  * the mbuf chains to form a single frame for transmission.
  372  */
  373 struct mbuf *
  374 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
  375         struct ieee80211_key *key)
  376 {
  377         struct mbuf *m2;
  378         struct ether_header eh1, eh2;
  379         struct llc *llc;
  380         struct mbuf *m;
  381         int pad;
  382 
  383         m2 = m1->m_nextpkt;
  384         if (m2 == NULL) {
  385                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  386                     "%s: only one frame\n", __func__);
  387                 goto bad;
  388         }
  389         m1->m_nextpkt = NULL;
  390         /*
  391          * Include fast frame headers in adjusting header layout.
  392          */
  393         KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
  394         ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
  395         m1 = ieee80211_mbuf_adjust(vap,
  396                 hdrspace + sizeof(struct llc) + sizeof(uint32_t) + 2 +
  397                     sizeof(struct ether_header),
  398                 key, m1);
  399         if (m1 == NULL) {
  400                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  401                 m_freem(m2);
  402                 goto bad;
  403         }
  404 
  405         /*
  406          * Copy second frame's Ethernet header out of line
  407          * and adjust for encapsulation headers.  Note that
  408          * we make room for padding in case there isn't room
  409          * at the end of first frame.
  410          */
  411         KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
  412         ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
  413         m2 = ieee80211_mbuf_adjust(vap,
  414                 ATH_FF_MAX_HDR_PAD + sizeof(struct ether_header),
  415                 NULL, m2);
  416         if (m2 == NULL) {
  417                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  418                 goto bad;
  419         }
  420 
  421         /*
  422          * Now do tunnel encapsulation.  First, each
  423          * frame gets a standard encapsulation.
  424          */
  425         m1 = ff_encap1(vap, m1, &eh1);
  426         if (m1 == NULL)
  427                 goto bad;
  428         m2 = ff_encap1(vap, m2, &eh2);
  429         if (m2 == NULL)
  430                 goto bad;
  431 
  432         /*
  433          * Pad leading frame to a 4-byte boundary.  If there
  434          * is space at the end of the first frame, put it
  435          * there; otherwise prepend to the front of the second
  436          * frame.  We know doing the second will always work
  437          * because we reserve space above.  We prefer appending
  438          * as this typically has better DMA alignment properties.
  439          */
  440         for (m = m1; m->m_next != NULL; m = m->m_next)
  441                 ;
  442         pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
  443         if (pad) {
  444                 if (M_TRAILINGSPACE(m) < pad) {         /* prepend to second */
  445                         m2->m_data -= pad;
  446                         m2->m_len += pad;
  447                         m2->m_pkthdr.len += pad;
  448                 } else {                                /* append to first */
  449                         m->m_len += pad;
  450                         m1->m_pkthdr.len += pad;
  451                 }
  452         }
  453 
  454         /*
  455          * Now, stick 'em together and prepend the tunnel headers;
  456          * first the Atheros tunnel header (all zero for now) and
  457          * then a special fast frame LLC.
  458          *
  459          * XXX optimize by prepending together
  460          */
  461         m->m_next = m2;                 /* NB: last mbuf from above */
  462         m1->m_pkthdr.len += m2->m_pkthdr.len;
  463         M_PREPEND(m1, sizeof(uint32_t)+2, M_DONTWAIT);
  464         if (m1 == NULL) {               /* XXX cannot happen */
  465                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  466                     "%s: no space for tunnel header\n", __func__);
  467                 vap->iv_stats.is_tx_nobuf++;
  468                 return NULL;
  469         }
  470         memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
  471 
  472         M_PREPEND(m1, sizeof(struct llc), M_DONTWAIT);
  473         if (m1 == NULL) {               /* XXX cannot happen */
  474                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  475                     "%s: no space for llc header\n", __func__);
  476                 vap->iv_stats.is_tx_nobuf++;
  477                 return NULL;
  478         }
  479         llc = mtod(m1, struct llc *);
  480         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  481         llc->llc_control = LLC_UI;
  482         llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
  483         llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
  484         llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
  485         llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
  486 
  487         vap->iv_stats.is_ff_encap++;
  488 
  489         return m1;
  490 bad:
  491         if (m1 != NULL)
  492                 m_freem(m1);
  493         if (m2 != NULL)
  494                 m_freem(m2);
  495         return NULL;
  496 }
  497 
  498 static void
  499 ff_transmit(struct ieee80211_node *ni, struct mbuf *m)
  500 {
  501         struct ieee80211vap *vap = ni->ni_vap;
  502         int error;
  503 
  504         /* encap and xmit */
  505         m = ieee80211_encap(vap, ni, m);
  506         if (m != NULL) {
  507                 struct ifnet *ifp = vap->iv_ifp;
  508                 struct ifnet *parent = ni->ni_ic->ic_ifp;
  509 
  510                 error = parent->if_transmit(parent, m);
  511                 if (error != 0) {
  512                         /* NB: IFQ_HANDOFF reclaims mbuf */
  513                         ieee80211_free_node(ni);
  514                 } else {
  515                         ifp->if_opackets++;
  516                 }
  517         } else
  518                 ieee80211_free_node(ni);
  519 }
  520 
  521 /*
  522  * Flush frames to device; note we re-use the linked list
  523  * the frames were stored on and use the sentinel (unchanged)
  524  * which may be non-NULL.
  525  */
  526 static void
  527 ff_flush(struct mbuf *head, struct mbuf *last)
  528 {
  529         struct mbuf *m, *next;
  530         struct ieee80211_node *ni;
  531         struct ieee80211vap *vap;
  532 
  533         for (m = head; m != last; m = next) {
  534                 next = m->m_nextpkt;
  535                 m->m_nextpkt = NULL;
  536 
  537                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  538                 vap = ni->ni_vap;
  539 
  540                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  541                     "%s: flush frame, age %u", __func__, M_AGE_GET(m));
  542                 vap->iv_stats.is_ff_flush++;
  543 
  544                 ff_transmit(ni, m);
  545         }
  546 }
  547 
  548 /*
  549  * Age frames on the staging queue.
  550  */
  551 void
  552 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq,
  553     int quanta)
  554 {
  555         struct ieee80211_superg *sg = ic->ic_superg;
  556         struct mbuf *m, *head;
  557         struct ieee80211_node *ni;
  558         struct ieee80211_tx_ampdu *tap;
  559 
  560         KASSERT(sq->head != NULL, ("stageq empty"));
  561 
  562         IEEE80211_LOCK(ic);
  563         head = sq->head;
  564         while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) {
  565                 /* clear tap ref to frame */
  566                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  567                 tap = &ni->ni_tx_ampdu[M_WME_GETAC(m)];
  568                 KASSERT(tap->txa_private == m, ("staging queue empty"));
  569                 tap->txa_private = NULL;
  570 
  571                 sq->head = m->m_nextpkt;
  572                 sq->depth--;
  573                 sg->ff_stageqdepth--;
  574         }
  575         if (m == NULL)
  576                 sq->tail = NULL;
  577         else
  578                 M_AGE_SUB(m, quanta);
  579         IEEE80211_UNLOCK(ic);
  580 
  581         ff_flush(head, m);
  582 }
  583 
  584 static void
  585 stageq_add(struct ieee80211_stageq *sq, struct mbuf *m)
  586 {
  587         int age = ieee80211_ffagemax;
  588         if (sq->tail != NULL) {
  589                 sq->tail->m_nextpkt = m;
  590                 age -= M_AGE_GET(sq->head);
  591         } else
  592                 sq->head = m;
  593         KASSERT(age >= 0, ("age %d", age));
  594         M_AGE_SET(m, age);
  595         m->m_nextpkt = NULL;
  596         sq->tail = m;
  597         sq->depth++;
  598 }
  599 
  600 static void
  601 stageq_remove(struct ieee80211_stageq *sq, struct mbuf *mstaged)
  602 {
  603         struct mbuf *m, *mprev;
  604 
  605         mprev = NULL;
  606         for (m = sq->head; m != NULL; m = m->m_nextpkt) {
  607                 if (m == mstaged) {
  608                         if (mprev == NULL)
  609                                 sq->head = m->m_nextpkt;
  610                         else
  611                                 mprev->m_nextpkt = m->m_nextpkt;
  612                         if (sq->tail == m)
  613                                 sq->tail = mprev;
  614                         sq->depth--;
  615                         return;
  616                 }
  617                 mprev = m;
  618         }
  619         printf("%s: packet not found\n", __func__);
  620 }
  621 
  622 static uint32_t
  623 ff_approx_txtime(struct ieee80211_node *ni,
  624         const struct mbuf *m1, const struct mbuf *m2)
  625 {
  626         struct ieee80211com *ic = ni->ni_ic;
  627         struct ieee80211vap *vap = ni->ni_vap;
  628         uint32_t framelen;
  629 
  630         /*
  631          * Approximate the frame length to be transmitted. A swag to add
  632          * the following maximal values to the skb payload:
  633          *   - 32: 802.11 encap + CRC
  634          *   - 24: encryption overhead (if wep bit)
  635          *   - 4 + 6: fast-frame header and padding
  636          *   - 16: 2 LLC FF tunnel headers
  637          *   - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd)
  638          */
  639         framelen = m1->m_pkthdr.len + 32 +
  640             ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR;
  641         if (vap->iv_flags & IEEE80211_F_PRIVACY)
  642                 framelen += 24;
  643         if (m2 != NULL)
  644                 framelen += m2->m_pkthdr.len;
  645         return ieee80211_compute_duration(ic->ic_rt, framelen, ni->ni_txrate, 0);
  646 }
  647 
  648 /*
  649  * Check if the supplied frame can be partnered with an existing
  650  * or pending frame.  Return a reference to any frame that should be
  651  * sent on return; otherwise return NULL.
  652  */
  653 struct mbuf *
  654 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m)
  655 {
  656         struct ieee80211vap *vap = ni->ni_vap;
  657         struct ieee80211com *ic = ni->ni_ic;
  658         struct ieee80211_superg *sg = ic->ic_superg;
  659         const int pri = M_WME_GETAC(m);
  660         struct ieee80211_stageq *sq;
  661         struct ieee80211_tx_ampdu *tap;
  662         struct mbuf *mstaged;
  663         uint32_t txtime, limit;
  664 
  665         /*
  666          * Check if the supplied frame can be aggregated.
  667          *
  668          * NB: we allow EAPOL frames to be aggregated with other ucast traffic.
  669          *     Do 802.1x EAPOL frames proceed in the clear? Then they couldn't
  670          *     be aggregated with other types of frames when encryption is on?
  671          */
  672         IEEE80211_LOCK(ic);
  673         tap = &ni->ni_tx_ampdu[pri];
  674         mstaged = tap->txa_private;             /* NB: we reuse AMPDU state */
  675         ieee80211_txampdu_count_packet(tap);
  676 
  677         /*
  678          * When not in station mode never aggregate a multicast
  679          * frame; this insures, for example, that a combined frame
  680          * does not require multiple encryption keys.
  681          */
  682         if (vap->iv_opmode != IEEE80211_M_STA &&
  683             ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) {
  684                 /* XXX flush staged frame? */
  685                 IEEE80211_UNLOCK(ic);
  686                 return m;
  687         }
  688         /*
  689          * If there is no frame to combine with and the pps is
  690          * too low; then do not attempt to aggregate this frame.
  691          */
  692         if (mstaged == NULL &&
  693             ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) {
  694                 IEEE80211_UNLOCK(ic);
  695                 return m;
  696         }
  697         sq = &sg->ff_stageq[pri];
  698         /*
  699          * Check the txop limit to insure the aggregate fits.
  700          */
  701         limit = IEEE80211_TXOP_TO_US(
  702                 ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit);
  703         if (limit != 0 &&
  704             (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) {
  705                 /*
  706                  * Aggregate too long, return to the caller for direct
  707                  * transmission.  In addition, flush any pending frame
  708                  * before sending this one.
  709                  */
  710                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  711                     "%s: txtime %u exceeds txop limit %u\n",
  712                     __func__, txtime, limit);
  713 
  714                 tap->txa_private = NULL;
  715                 if (mstaged != NULL)
  716                         stageq_remove(sq, mstaged);
  717                 IEEE80211_UNLOCK(ic);
  718 
  719                 if (mstaged != NULL) {
  720                         IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  721                             "%s: flush staged frame", __func__);
  722                         /* encap and xmit */
  723                         ff_transmit(ni, mstaged);
  724                 }
  725                 return m;               /* NB: original frame */
  726         }
  727         /*
  728          * An aggregation candidate.  If there's a frame to partner
  729          * with then combine and return for processing.  Otherwise
  730          * save this frame and wait for a partner to show up (or
  731          * the frame to be flushed).  Note that staged frames also
  732          * hold their node reference.
  733          */
  734         if (mstaged != NULL) {
  735                 tap->txa_private = NULL;
  736                 stageq_remove(sq, mstaged);
  737                 IEEE80211_UNLOCK(ic);
  738 
  739                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  740                     "%s: aggregate fast-frame", __func__);
  741                 /*
  742                  * Release the node reference; we only need
  743                  * the one already in mstaged.
  744                  */
  745                 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni,
  746                     ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni));
  747                 ieee80211_free_node(ni);
  748 
  749                 m->m_nextpkt = NULL;
  750                 mstaged->m_nextpkt = m;
  751                 mstaged->m_flags |= M_FF; /* NB: mark for encap work */
  752         } else {
  753                 KASSERT(tap->txa_private == NULL,
  754                     ("txa_private %p", tap->txa_private));
  755                 tap->txa_private = m;
  756 
  757                 stageq_add(sq, m);
  758                 sg->ff_stageqdepth++;
  759                 IEEE80211_UNLOCK(ic);
  760 
  761                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  762                     "%s: stage frame, %u queued", __func__, sq->depth);
  763                 /* NB: mstaged is NULL */
  764         }
  765         return mstaged;
  766 }
  767 
  768 void
  769 ieee80211_ff_node_init(struct ieee80211_node *ni)
  770 {
  771         /*
  772          * Clean FF state on re-associate.  This handles the case
  773          * where a station leaves w/o notifying us and then returns
  774          * before node is reaped for inactivity.
  775          */
  776         ieee80211_ff_node_cleanup(ni);
  777 }
  778 
  779 void
  780 ieee80211_ff_node_cleanup(struct ieee80211_node *ni)
  781 {
  782         struct ieee80211com *ic = ni->ni_ic;
  783         struct ieee80211_superg *sg = ic->ic_superg;
  784         struct ieee80211_tx_ampdu *tap;
  785         struct mbuf *m, *head;
  786         int ac;
  787 
  788         IEEE80211_LOCK(ic);
  789         head = NULL;
  790         for (ac = 0; ac < WME_NUM_AC; ac++) {
  791                 tap = &ni->ni_tx_ampdu[ac];
  792                 m = tap->txa_private;
  793                 if (m != NULL) {
  794                         tap->txa_private = NULL;
  795                         stageq_remove(&sg->ff_stageq[ac], m);
  796                         m->m_nextpkt = head;
  797                         head = m;
  798                 }
  799         }
  800         IEEE80211_UNLOCK(ic);
  801 
  802         for (m = head; m != NULL; m = m->m_nextpkt) {
  803                 m_freem(m);
  804                 ieee80211_free_node(ni);
  805         }
  806 }
  807 
  808 /*
  809  * Switch between turbo and non-turbo operating modes.
  810  * Use the specified channel flags to locate the new
  811  * channel, update 802.11 state, and then call back into
  812  * the driver to effect the change.
  813  */
  814 void
  815 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
  816 {
  817         struct ieee80211com *ic = vap->iv_ic;
  818         struct ieee80211_channel *chan;
  819 
  820         chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
  821         if (chan == NULL) {             /* XXX should not happen */
  822                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  823                     "%s: no channel with freq %u flags 0x%x\n",
  824                     __func__, ic->ic_bsschan->ic_freq, newflags);
  825                 return;
  826         }
  827 
  828         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  829             "%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
  830             ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
  831             ieee80211_phymode_name[ieee80211_chan2mode(chan)],
  832             chan->ic_freq, chan->ic_flags);
  833 
  834         ic->ic_bsschan = chan;
  835         ic->ic_prevchan = ic->ic_curchan;
  836         ic->ic_curchan = chan;
  837         ic->ic_rt = ieee80211_get_ratetable(chan);
  838         ic->ic_set_channel(ic);
  839         ieee80211_radiotap_chan_change(ic);
  840         /* NB: do not need to reset ERP state 'cuz we're in sta mode */
  841 }
  842 
  843 /*
  844  * Return the current ``state'' of an Atheros capbility.
  845  * If associated in station mode report the negotiated
  846  * setting. Otherwise report the current setting.
  847  */
  848 static int
  849 getathcap(struct ieee80211vap *vap, int cap)
  850 {
  851         if (vap->iv_opmode == IEEE80211_M_STA &&
  852             vap->iv_state == IEEE80211_S_RUN)
  853                 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
  854         else
  855                 return (vap->iv_flags & cap) != 0;
  856 }
  857 
  858 static int
  859 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
  860 {
  861         switch (ireq->i_type) {
  862         case IEEE80211_IOC_FF:
  863                 ireq->i_val = getathcap(vap, IEEE80211_F_FF);
  864                 break;
  865         case IEEE80211_IOC_TURBOP:
  866                 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
  867                 break;
  868         default:
  869                 return ENOSYS;
  870         }
  871         return 0;
  872 }
  873 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
  874 
  875 static int
  876 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
  877 {
  878         switch (ireq->i_type) {
  879         case IEEE80211_IOC_FF:
  880                 if (ireq->i_val) {
  881                         if ((vap->iv_caps & IEEE80211_C_FF) == 0)
  882                                 return EOPNOTSUPP;
  883                         vap->iv_flags |= IEEE80211_F_FF;
  884                 } else
  885                         vap->iv_flags &= ~IEEE80211_F_FF;
  886                 return ENETRESET;
  887         case IEEE80211_IOC_TURBOP:
  888                 if (ireq->i_val) {
  889                         if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
  890                                 return EOPNOTSUPP;
  891                         vap->iv_flags |= IEEE80211_F_TURBOP;
  892                 } else
  893                         vap->iv_flags &= ~IEEE80211_F_TURBOP;
  894                 return ENETRESET;
  895         default:
  896                 return ENOSYS;
  897         }
  898         return 0;
  899 }
  900 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);

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