ieee80211_superg.c

Version: - FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   21  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   22  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   23  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   24  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   25  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/12.0/sys/net80211/ieee80211_superg.c 326272 2017-11-27 15:23:17Z pfg $");
   30 
   31 #include "opt_wlan.h"
   32 
   33 #ifdef  IEEE80211_SUPPORT_SUPERG
   34 
   35 #include <sys/param.h>
   36 #include <sys/systm.h> 
   37 #include <sys/mbuf.h>   
   38 #include <sys/kernel.h>
   39 #include <sys/endian.h>
   40 
   41 #include <sys/socket.h>
   42  
   43 #include <net/if.h>
   44 #include <net/if_var.h>
   45 #include <net/if_llc.h>
   46 #include <net/if_media.h>
   47 #include <net/bpf.h>
   48 #include <net/ethernet.h>
   49 
   50 #include <net80211/ieee80211_var.h>
   51 #include <net80211/ieee80211_input.h>
   52 #include <net80211/ieee80211_phy.h>
   53 #include <net80211/ieee80211_superg.h>
   54 
   55 /*
   56  * Atheros fast-frame encapsulation format.
   57  * FF max payload:
   58  * 802.2 + FFHDR + HPAD + 802.3 + 802.2 + 1500 + SPAD + 802.3 + 802.2 + 1500:
   59  *   8   +   4   +  4   +   14  +   8   + 1500 +  6   +   14  +   8   + 1500
   60  * = 3066
   61  */
   62 /* fast frame header is 32-bits */
   63 #define ATH_FF_PROTO    0x0000003f      /* protocol */
   64 #define ATH_FF_PROTO_S  0
   65 #define ATH_FF_FTYPE    0x000000c0      /* frame type */
   66 #define ATH_FF_FTYPE_S  6
   67 #define ATH_FF_HLEN32   0x00000300      /* optional hdr length */
   68 #define ATH_FF_HLEN32_S 8
   69 #define ATH_FF_SEQNUM   0x001ffc00      /* sequence number */
   70 #define ATH_FF_SEQNUM_S 10
   71 #define ATH_FF_OFFSET   0xffe00000      /* offset to 2nd payload */
   72 #define ATH_FF_OFFSET_S 21
   73 
   74 #define ATH_FF_MAX_HDR_PAD      4
   75 #define ATH_FF_MAX_SEP_PAD      6
   76 #define ATH_FF_MAX_HDR          30
   77 
   78 #define ATH_FF_PROTO_L2TUNNEL   0       /* L2 tunnel protocol */
   79 #define ATH_FF_ETH_TYPE         0x88bd  /* Ether type for encapsulated frames */
   80 #define ATH_FF_SNAP_ORGCODE_0   0x00
   81 #define ATH_FF_SNAP_ORGCODE_1   0x03
   82 #define ATH_FF_SNAP_ORGCODE_2   0x7f
   83 
   84 #define ATH_FF_TXQMIN   2               /* min txq depth for staging */
   85 #define ATH_FF_TXQMAX   50              /* maximum # of queued frames allowed */
   86 #define ATH_FF_STAGEMAX 5               /* max waiting period for staged frame*/
   87 
   88 #define ETHER_HEADER_COPY(dst, src) \
   89         memcpy(dst, src, sizeof(struct ether_header))
   90 
   91 static  int ieee80211_ffppsmin = 2;     /* pps threshold for ff aggregation */
   92 SYSCTL_INT(_net_wlan, OID_AUTO, ffppsmin, CTLFLAG_RW,
   93         &ieee80211_ffppsmin, 0, "min packet rate before fast-frame staging");
   94 static  int ieee80211_ffagemax = -1;    /* max time frames held on stage q */
   95 SYSCTL_PROC(_net_wlan, OID_AUTO, ffagemax, CTLTYPE_INT | CTLFLAG_RW,
   96         &ieee80211_ffagemax, 0, ieee80211_sysctl_msecs_ticks, "I",
   97         "max hold time for fast-frame staging (ms)");
   98 
   99 static void
  100 ff_age_all(void *arg, int npending)
  101 {
  102         struct ieee80211com *ic = arg;
  103 
  104         /* XXX cache timer value somewhere (racy) */
  105         ieee80211_ff_age_all(ic, ieee80211_ffagemax + 1);
  106 }
  107 
  108 void
  109 ieee80211_superg_attach(struct ieee80211com *ic)
  110 {
  111         struct ieee80211_superg *sg;
  112 
  113         IEEE80211_FF_LOCK_INIT(ic, ic->ic_name);
  114 
  115         sg = (struct ieee80211_superg *) IEEE80211_MALLOC(
  116              sizeof(struct ieee80211_superg), M_80211_VAP,
  117              IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
  118         if (sg == NULL) {
  119                 printf("%s: cannot allocate SuperG state block\n",
  120                     __func__);
  121                 return;
  122         }
  123         TIMEOUT_TASK_INIT(ic->ic_tq, &sg->ff_qtimer, 0, ff_age_all, ic);
  124         ic->ic_superg = sg;
  125 
  126         /*
  127          * Default to not being so aggressive for FF/AMSDU
  128          * aging, otherwise we may hold a frame around
  129          * for way too long before we expire it out.
  130          */
  131         ieee80211_ffagemax = msecs_to_ticks(2);
  132 }
  133 
  134 void
  135 ieee80211_superg_detach(struct ieee80211com *ic)
  136 {
  137 
  138         if (ic->ic_superg != NULL) {
  139                 struct timeout_task *qtask = &ic->ic_superg->ff_qtimer;
  140 
  141                 while (taskqueue_cancel_timeout(ic->ic_tq, qtask, NULL) != 0)
  142                         taskqueue_drain_timeout(ic->ic_tq, qtask);
  143                 IEEE80211_FREE(ic->ic_superg, M_80211_VAP);
  144                 ic->ic_superg = NULL;
  145         }
  146         IEEE80211_FF_LOCK_DESTROY(ic);
  147 }
  148 
  149 void
  150 ieee80211_superg_vattach(struct ieee80211vap *vap)
  151 {
  152         struct ieee80211com *ic = vap->iv_ic;
  153 
  154         if (ic->ic_superg == NULL)      /* NB: can't do fast-frames w/o state */
  155                 vap->iv_caps &= ~IEEE80211_C_FF;
  156         if (vap->iv_caps & IEEE80211_C_FF)
  157                 vap->iv_flags |= IEEE80211_F_FF;
  158         /* NB: we only implement sta mode */
  159         if (vap->iv_opmode == IEEE80211_M_STA &&
  160             (vap->iv_caps & IEEE80211_C_TURBOP))
  161                 vap->iv_flags |= IEEE80211_F_TURBOP;
  162 }
  163 
  164 void
  165 ieee80211_superg_vdetach(struct ieee80211vap *vap)
  166 {
  167 }
  168 
  169 #define ATH_OUI_BYTES           0x00, 0x03, 0x7f
  170 /*
  171  * Add a WME information element to a frame.
  172  */
  173 uint8_t *
  174 ieee80211_add_ath(uint8_t *frm, uint8_t caps, ieee80211_keyix defkeyix)
  175 {
  176         static const struct ieee80211_ath_ie info = {
  177                 .ath_id         = IEEE80211_ELEMID_VENDOR,
  178                 .ath_len        = sizeof(struct ieee80211_ath_ie) - 2,
  179                 .ath_oui        = { ATH_OUI_BYTES },
  180                 .ath_oui_type   = ATH_OUI_TYPE,
  181                 .ath_oui_subtype= ATH_OUI_SUBTYPE,
  182                 .ath_version    = ATH_OUI_VERSION,
  183         };
  184         struct ieee80211_ath_ie *ath = (struct ieee80211_ath_ie *) frm;
  185 
  186         memcpy(frm, &info, sizeof(info));
  187         ath->ath_capability = caps;
  188         if (defkeyix != IEEE80211_KEYIX_NONE) {
  189                 ath->ath_defkeyix[0] = (defkeyix & 0xff);
  190                 ath->ath_defkeyix[1] = ((defkeyix >> 8) & 0xff);
  191         } else {
  192                 ath->ath_defkeyix[0] = 0xff;
  193                 ath->ath_defkeyix[1] = 0x7f;
  194         }
  195         return frm + sizeof(info); 
  196 }
  197 #undef ATH_OUI_BYTES
  198 
  199 uint8_t *
  200 ieee80211_add_athcaps(uint8_t *frm, const struct ieee80211_node *bss)
  201 {
  202         const struct ieee80211vap *vap = bss->ni_vap;
  203 
  204         return ieee80211_add_ath(frm,
  205             vap->iv_flags & IEEE80211_F_ATHEROS,
  206             ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
  207             bss->ni_authmode != IEEE80211_AUTH_8021X) ?
  208             vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
  209 }
  210 
  211 void
  212 ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie)
  213 {
  214         const struct ieee80211_ath_ie *ath =
  215                 (const struct ieee80211_ath_ie *) ie;
  216 
  217         ni->ni_ath_flags = ath->ath_capability;
  218         ni->ni_ath_defkeyix = le16dec(&ath->ath_defkeyix);
  219 }
  220 
  221 int
  222 ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm,
  223         const struct ieee80211_frame *wh)
  224 {
  225         struct ieee80211vap *vap = ni->ni_vap;
  226         const struct ieee80211_ath_ie *ath;
  227         u_int len = frm[1];
  228         int capschanged;
  229         uint16_t defkeyix;
  230 
  231         if (len < sizeof(struct ieee80211_ath_ie)-2) {
  232                 IEEE80211_DISCARD_IE(vap,
  233                     IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG,
  234                     wh, "Atheros", "too short, len %u", len);
  235                 return -1;
  236         }
  237         ath = (const struct ieee80211_ath_ie *)frm;
  238         capschanged = (ni->ni_ath_flags != ath->ath_capability);
  239         defkeyix = le16dec(ath->ath_defkeyix);
  240         if (capschanged || defkeyix != ni->ni_ath_defkeyix) {
  241                 ni->ni_ath_flags = ath->ath_capability;
  242                 ni->ni_ath_defkeyix = defkeyix;
  243                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  244                     "ath ie change: new caps 0x%x defkeyix 0x%x",
  245                     ni->ni_ath_flags, ni->ni_ath_defkeyix);
  246         }
  247         if (IEEE80211_ATH_CAP(vap, ni, ATHEROS_CAP_TURBO_PRIME)) {
  248                 uint16_t curflags, newflags;
  249 
  250                 /*
  251                  * Check for turbo mode switch.  Calculate flags
  252                  * for the new mode and effect the switch.
  253                  */
  254                 newflags = curflags = vap->iv_ic->ic_bsschan->ic_flags;
  255                 /* NB: BOOST is not in ic_flags, so get it from the ie */
  256                 if (ath->ath_capability & ATHEROS_CAP_BOOST) 
  257                         newflags |= IEEE80211_CHAN_TURBO;
  258                 else
  259                         newflags &= ~IEEE80211_CHAN_TURBO;
  260                 if (newflags != curflags)
  261                         ieee80211_dturbo_switch(vap, newflags);
  262         }
  263         return capschanged;
  264 }
  265 
  266 /*
  267  * Decap the encapsulated frame pair and dispatch the first
  268  * for delivery.  The second frame is returned for delivery
  269  * via the normal path.
  270  */
  271 struct mbuf *
  272 ieee80211_ff_decap(struct ieee80211_node *ni, struct mbuf *m)
  273 {
  274 #define FF_LLC_SIZE     (sizeof(struct ether_header) + sizeof(struct llc))
  275 #define MS(x,f) (((x) & f) >> f##_S)
  276         struct ieee80211vap *vap = ni->ni_vap;
  277         struct llc *llc;
  278         uint32_t ath;
  279         struct mbuf *n;
  280         int framelen;
  281 
  282         /* NB: we assume caller does this check for us */
  283         KASSERT(IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF),
  284             ("ff not negotiated"));
  285         /*
  286          * Check for fast-frame tunnel encapsulation.
  287          */
  288         if (m->m_pkthdr.len < 3*FF_LLC_SIZE)
  289                 return m;
  290         if (m->m_len < FF_LLC_SIZE &&
  291             (m = m_pullup(m, FF_LLC_SIZE)) == NULL) {
  292                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  293                     ni->ni_macaddr, "fast-frame",
  294                     "%s", "m_pullup(llc) failed");
  295                 vap->iv_stats.is_rx_tooshort++;
  296                 return NULL;
  297         }
  298         llc = (struct llc *)(mtod(m, uint8_t *) +
  299             sizeof(struct ether_header));
  300         if (llc->llc_snap.ether_type != htons(ATH_FF_ETH_TYPE))
  301                 return m;
  302         m_adj(m, FF_LLC_SIZE);
  303         m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath);
  304         if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) {
  305                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  306                     ni->ni_macaddr, "fast-frame",
  307                     "unsupport tunnel protocol, header 0x%x", ath);
  308                 vap->iv_stats.is_ff_badhdr++;
  309                 m_freem(m);
  310                 return NULL;
  311         }
  312         /* NB: skip header and alignment padding */
  313         m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2);
  314 
  315         vap->iv_stats.is_ff_decap++;
  316 
  317         /*
  318          * Decap the first frame, bust it apart from the
  319          * second and deliver; then decap the second frame
  320          * and return it to the caller for normal delivery.
  321          */
  322         m = ieee80211_decap1(m, &framelen);
  323         if (m == NULL) {
  324                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  325                     ni->ni_macaddr, "fast-frame", "%s", "first decap failed");
  326                 vap->iv_stats.is_ff_tooshort++;
  327                 return NULL;
  328         }
  329         n = m_split(m, framelen, M_NOWAIT);
  330         if (n == NULL) {
  331                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  332                     ni->ni_macaddr, "fast-frame",
  333                     "%s", "unable to split encapsulated frames");
  334                 vap->iv_stats.is_ff_split++;
  335                 m_freem(m);                     /* NB: must reclaim */
  336                 return NULL;
  337         }
  338         /* XXX not right for WDS */
  339         vap->iv_deliver_data(vap, ni, m);       /* 1st of pair */
  340 
  341         /*
  342          * Decap second frame.
  343          */
  344         m_adj(n, roundup2(framelen, 4) - framelen);     /* padding */
  345         n = ieee80211_decap1(n, &framelen);
  346         if (n == NULL) {
  347                 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
  348                     ni->ni_macaddr, "fast-frame", "%s", "second decap failed");
  349                 vap->iv_stats.is_ff_tooshort++;
  350         }
  351         /* XXX verify framelen against mbuf contents */
  352         return n;                               /* 2nd delivered by caller */
  353 #undef MS
  354 #undef FF_LLC_SIZE
  355 }
  356 
  357 /*
  358  * Fast frame encapsulation.  There must be two packets
  359  * chained with m_nextpkt.  We do header adjustment for
  360  * each, add the tunnel encapsulation, and then concatenate
  361  * the mbuf chains to form a single frame for transmission.
  362  */
  363 struct mbuf *
  364 ieee80211_ff_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
  365         struct ieee80211_key *key)
  366 {
  367         struct mbuf *m2;
  368         struct ether_header eh1, eh2;
  369         struct llc *llc;
  370         struct mbuf *m;
  371         int pad;
  372 
  373         m2 = m1->m_nextpkt;
  374         if (m2 == NULL) {
  375                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  376                     "%s: only one frame\n", __func__);
  377                 goto bad;
  378         }
  379         m1->m_nextpkt = NULL;
  380 
  381         /*
  382          * Adjust to include 802.11 header requirement.
  383          */
  384         KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
  385         ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
  386         m1 = ieee80211_mbuf_adjust(vap, hdrspace, key, m1);
  387         if (m1 == NULL) {
  388                 printf("%s: failed initial mbuf_adjust\n", __func__);
  389                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  390                 m_freem(m2);
  391                 goto bad;
  392         }
  393 
  394         /*
  395          * Copy second frame's Ethernet header out of line
  396          * and adjust for possible padding in case there isn't room
  397          * at the end of first frame.
  398          */
  399         KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
  400         ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
  401         m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
  402         if (m2 == NULL) {
  403                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  404                 printf("%s: failed second \n", __func__);
  405                 goto bad;
  406         }
  407 
  408         /*
  409          * Now do tunnel encapsulation.  First, each
  410          * frame gets a standard encapsulation.
  411          */
  412         m1 = ieee80211_ff_encap1(vap, m1, &eh1);
  413         if (m1 == NULL)
  414                 goto bad;
  415         m2 = ieee80211_ff_encap1(vap, m2, &eh2);
  416         if (m2 == NULL)
  417                 goto bad;
  418 
  419         /*
  420          * Pad leading frame to a 4-byte boundary.  If there
  421          * is space at the end of the first frame, put it
  422          * there; otherwise prepend to the front of the second
  423          * frame.  We know doing the second will always work
  424          * because we reserve space above.  We prefer appending
  425          * as this typically has better DMA alignment properties.
  426          */
  427         for (m = m1; m->m_next != NULL; m = m->m_next)
  428                 ;
  429         pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
  430         if (pad) {
  431                 if (M_TRAILINGSPACE(m) < pad) {         /* prepend to second */
  432                         m2->m_data -= pad;
  433                         m2->m_len += pad;
  434                         m2->m_pkthdr.len += pad;
  435                 } else {                                /* append to first */
  436                         m->m_len += pad;
  437                         m1->m_pkthdr.len += pad;
  438                 }
  439         }
  440 
  441         /*
  442          * A-MSDU's are just appended; the "I'm A-MSDU!" bit is in the
  443          * QoS header.
  444          *
  445          * XXX optimize by prepending together
  446          */
  447         m->m_next = m2;                 /* NB: last mbuf from above */
  448         m1->m_pkthdr.len += m2->m_pkthdr.len;
  449         M_PREPEND(m1, sizeof(uint32_t)+2, M_NOWAIT);
  450         if (m1 == NULL) {               /* XXX cannot happen */
  451                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  452                     "%s: no space for tunnel header\n", __func__);
  453                 vap->iv_stats.is_tx_nobuf++;
  454                 return NULL;
  455         }
  456         memset(mtod(m1, void *), 0, sizeof(uint32_t)+2);
  457 
  458         M_PREPEND(m1, sizeof(struct llc), M_NOWAIT);
  459         if (m1 == NULL) {               /* XXX cannot happen */
  460                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  461                     "%s: no space for llc header\n", __func__);
  462                 vap->iv_stats.is_tx_nobuf++;
  463                 return NULL;
  464         }
  465         llc = mtod(m1, struct llc *);
  466         llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
  467         llc->llc_control = LLC_UI;
  468         llc->llc_snap.org_code[0] = ATH_FF_SNAP_ORGCODE_0;
  469         llc->llc_snap.org_code[1] = ATH_FF_SNAP_ORGCODE_1;
  470         llc->llc_snap.org_code[2] = ATH_FF_SNAP_ORGCODE_2;
  471         llc->llc_snap.ether_type = htons(ATH_FF_ETH_TYPE);
  472 
  473         vap->iv_stats.is_ff_encap++;
  474 
  475         return m1;
  476 bad:
  477         vap->iv_stats.is_ff_encapfail++;
  478         if (m1 != NULL)
  479                 m_freem(m1);
  480         if (m2 != NULL)
  481                 m_freem(m2);
  482         return NULL;
  483 }
  484 
  485 /*
  486  * A-MSDU encapsulation.
  487  *
  488  * This assumes just two frames for now, since we're borrowing the
  489  * same queuing code and infrastructure as fast-frames.
  490  *
  491  * There must be two packets chained with m_nextpkt.
  492  * We do header adjustment for each, and then concatenate the mbuf chains
  493  * to form a single frame for transmission.
  494  */
  495 struct mbuf *
  496 ieee80211_amsdu_encap(struct ieee80211vap *vap, struct mbuf *m1, int hdrspace,
  497         struct ieee80211_key *key)
  498 {
  499         struct mbuf *m2;
  500         struct ether_header eh1, eh2;
  501         struct mbuf *m;
  502         int pad;
  503 
  504         m2 = m1->m_nextpkt;
  505         if (m2 == NULL) {
  506                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  507                     "%s: only one frame\n", __func__);
  508                 goto bad;
  509         }
  510         m1->m_nextpkt = NULL;
  511 
  512         /*
  513          * Include A-MSDU header in adjusting header layout.
  514          */
  515         KASSERT(m1->m_len >= sizeof(eh1), ("no ethernet header!"));
  516         ETHER_HEADER_COPY(&eh1, mtod(m1, caddr_t));
  517         m1 = ieee80211_mbuf_adjust(vap,
  518                 hdrspace + sizeof(struct llc) + sizeof(uint32_t) +
  519                     sizeof(struct ether_header),
  520                 key, m1);
  521         if (m1 == NULL) {
  522                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  523                 m_freem(m2);
  524                 goto bad;
  525         }
  526 
  527         /*
  528          * Copy second frame's Ethernet header out of line
  529          * and adjust for encapsulation headers.  Note that
  530          * we make room for padding in case there isn't room
  531          * at the end of first frame.
  532          */
  533         KASSERT(m2->m_len >= sizeof(eh2), ("no ethernet header!"));
  534         ETHER_HEADER_COPY(&eh2, mtod(m2, caddr_t));
  535         m2 = ieee80211_mbuf_adjust(vap, 4, NULL, m2);
  536         if (m2 == NULL) {
  537                 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
  538                 goto bad;
  539         }
  540 
  541         /*
  542          * Now do tunnel encapsulation.  First, each
  543          * frame gets a standard encapsulation.
  544          */
  545         m1 = ieee80211_ff_encap1(vap, m1, &eh1);
  546         if (m1 == NULL)
  547                 goto bad;
  548         m2 = ieee80211_ff_encap1(vap, m2, &eh2);
  549         if (m2 == NULL)
  550                 goto bad;
  551 
  552         /*
  553          * Pad leading frame to a 4-byte boundary.  If there
  554          * is space at the end of the first frame, put it
  555          * there; otherwise prepend to the front of the second
  556          * frame.  We know doing the second will always work
  557          * because we reserve space above.  We prefer appending
  558          * as this typically has better DMA alignment properties.
  559          */
  560         for (m = m1; m->m_next != NULL; m = m->m_next)
  561                 ;
  562         pad = roundup2(m1->m_pkthdr.len, 4) - m1->m_pkthdr.len;
  563         if (pad) {
  564                 if (M_TRAILINGSPACE(m) < pad) {         /* prepend to second */
  565                         m2->m_data -= pad;
  566                         m2->m_len += pad;
  567                         m2->m_pkthdr.len += pad;
  568                 } else {                                /* append to first */
  569                         m->m_len += pad;
  570                         m1->m_pkthdr.len += pad;
  571                 }
  572         }
  573 
  574         /*
  575          * Now, stick 'em together.
  576          */
  577         m->m_next = m2;                 /* NB: last mbuf from above */
  578         m1->m_pkthdr.len += m2->m_pkthdr.len;
  579 
  580         vap->iv_stats.is_amsdu_encap++;
  581 
  582         return m1;
  583 bad:
  584         vap->iv_stats.is_amsdu_encapfail++;
  585         if (m1 != NULL)
  586                 m_freem(m1);
  587         if (m2 != NULL)
  588                 m_freem(m2);
  589         return NULL;
  590 }
  591 
  592 
  593 static void
  594 ff_transmit(struct ieee80211_node *ni, struct mbuf *m)
  595 {
  596         struct ieee80211vap *vap = ni->ni_vap;
  597         struct ieee80211com *ic = ni->ni_ic;
  598 
  599         IEEE80211_TX_LOCK_ASSERT(ic);
  600 
  601         /* encap and xmit */
  602         m = ieee80211_encap(vap, ni, m);
  603         if (m != NULL)
  604                 (void) ieee80211_parent_xmitpkt(ic, m);
  605         else
  606                 ieee80211_free_node(ni);
  607 }
  608 
  609 /*
  610  * Flush frames to device; note we re-use the linked list
  611  * the frames were stored on and use the sentinel (unchanged)
  612  * which may be non-NULL.
  613  */
  614 static void
  615 ff_flush(struct mbuf *head, struct mbuf *last)
  616 {
  617         struct mbuf *m, *next;
  618         struct ieee80211_node *ni;
  619         struct ieee80211vap *vap;
  620 
  621         for (m = head; m != last; m = next) {
  622                 next = m->m_nextpkt;
  623                 m->m_nextpkt = NULL;
  624 
  625                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  626                 vap = ni->ni_vap;
  627 
  628                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  629                     "%s: flush frame, age %u", __func__, M_AGE_GET(m));
  630                 vap->iv_stats.is_ff_flush++;
  631 
  632                 ff_transmit(ni, m);
  633         }
  634 }
  635 
  636 /*
  637  * Age frames on the staging queue.
  638  */
  639 void
  640 ieee80211_ff_age(struct ieee80211com *ic, struct ieee80211_stageq *sq,
  641     int quanta)
  642 {
  643         struct mbuf *m, *head;
  644         struct ieee80211_node *ni;
  645 
  646         IEEE80211_FF_LOCK(ic);
  647         if (sq->depth == 0) {
  648                 IEEE80211_FF_UNLOCK(ic);
  649                 return;         /* nothing to do */
  650         }
  651 
  652         KASSERT(sq->head != NULL, ("stageq empty"));
  653 
  654         head = sq->head;
  655         while ((m = sq->head) != NULL && M_AGE_GET(m) < quanta) {
  656                 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
  657 
  658                 /* clear staging ref to frame */
  659                 ni = (struct ieee80211_node *) m->m_pkthdr.rcvif;
  660                 KASSERT(ni->ni_tx_superg[tid] == m, ("staging queue empty"));
  661                 ni->ni_tx_superg[tid] = NULL;
  662 
  663                 sq->head = m->m_nextpkt;
  664                 sq->depth--;
  665         }
  666         if (m == NULL)
  667                 sq->tail = NULL;
  668         else
  669                 M_AGE_SUB(m, quanta);
  670         IEEE80211_FF_UNLOCK(ic);
  671 
  672         IEEE80211_TX_LOCK(ic);
  673         ff_flush(head, m);
  674         IEEE80211_TX_UNLOCK(ic);
  675 }
  676 
  677 static void
  678 stageq_add(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *m)
  679 {
  680         int age = ieee80211_ffagemax;
  681 
  682         IEEE80211_FF_LOCK_ASSERT(ic);
  683 
  684         if (sq->tail != NULL) {
  685                 sq->tail->m_nextpkt = m;
  686                 age -= M_AGE_GET(sq->head);
  687         } else {
  688                 sq->head = m;
  689 
  690                 struct timeout_task *qtask = &ic->ic_superg->ff_qtimer;
  691                 taskqueue_enqueue_timeout(ic->ic_tq, qtask, age);
  692         }
  693         KASSERT(age >= 0, ("age %d", age));
  694         M_AGE_SET(m, age);
  695         m->m_nextpkt = NULL;
  696         sq->tail = m;
  697         sq->depth++;
  698 }
  699 
  700 static void
  701 stageq_remove(struct ieee80211com *ic, struct ieee80211_stageq *sq, struct mbuf *mstaged)
  702 {
  703         struct mbuf *m, *mprev;
  704 
  705         IEEE80211_FF_LOCK_ASSERT(ic);
  706 
  707         mprev = NULL;
  708         for (m = sq->head; m != NULL; m = m->m_nextpkt) {
  709                 if (m == mstaged) {
  710                         if (mprev == NULL)
  711                                 sq->head = m->m_nextpkt;
  712                         else
  713                                 mprev->m_nextpkt = m->m_nextpkt;
  714                         if (sq->tail == m)
  715                                 sq->tail = mprev;
  716                         sq->depth--;
  717                         return;
  718                 }
  719                 mprev = m;
  720         }
  721         printf("%s: packet not found\n", __func__);
  722 }
  723 
  724 static uint32_t
  725 ff_approx_txtime(struct ieee80211_node *ni,
  726         const struct mbuf *m1, const struct mbuf *m2)
  727 {
  728         struct ieee80211com *ic = ni->ni_ic;
  729         struct ieee80211vap *vap = ni->ni_vap;
  730         uint32_t framelen;
  731         uint32_t frame_time;
  732 
  733         /*
  734          * Approximate the frame length to be transmitted. A swag to add
  735          * the following maximal values to the skb payload:
  736          *   - 32: 802.11 encap + CRC
  737          *   - 24: encryption overhead (if wep bit)
  738          *   - 4 + 6: fast-frame header and padding
  739          *   - 16: 2 LLC FF tunnel headers
  740          *   - 14: 1 802.3 FF tunnel header (mbuf already accounts for 2nd)
  741          */
  742         framelen = m1->m_pkthdr.len + 32 +
  743             ATH_FF_MAX_HDR_PAD + ATH_FF_MAX_SEP_PAD + ATH_FF_MAX_HDR;
  744         if (vap->iv_flags & IEEE80211_F_PRIVACY)
  745                 framelen += 24;
  746         if (m2 != NULL)
  747                 framelen += m2->m_pkthdr.len;
  748 
  749         /*
  750          * For now, we assume non-shortgi, 20MHz, just because I want to
  751          * at least test 802.11n.
  752          */
  753         if (ni->ni_txrate & IEEE80211_RATE_MCS)
  754                 frame_time = ieee80211_compute_duration_ht(framelen,
  755                     ni->ni_txrate,
  756                     IEEE80211_HT_RC_2_STREAMS(ni->ni_txrate),
  757                     0, /* isht40 */
  758                     0); /* isshortgi */
  759         else
  760                 frame_time = ieee80211_compute_duration(ic->ic_rt, framelen,
  761                             ni->ni_txrate, 0);
  762         return (frame_time);
  763 }
  764 
  765 /*
  766  * Check if the supplied frame can be partnered with an existing
  767  * or pending frame.  Return a reference to any frame that should be
  768  * sent on return; otherwise return NULL.
  769  */
  770 struct mbuf *
  771 ieee80211_ff_check(struct ieee80211_node *ni, struct mbuf *m)
  772 {
  773         struct ieee80211vap *vap = ni->ni_vap;
  774         struct ieee80211com *ic = ni->ni_ic;
  775         struct ieee80211_superg *sg = ic->ic_superg;
  776         const int pri = M_WME_GETAC(m);
  777         struct ieee80211_stageq *sq;
  778         struct ieee80211_tx_ampdu *tap;
  779         struct mbuf *mstaged;
  780         uint32_t txtime, limit;
  781 
  782         IEEE80211_TX_UNLOCK_ASSERT(ic);
  783 
  784         IEEE80211_LOCK(ic);
  785         limit = IEEE80211_TXOP_TO_US(
  786             ic->ic_wme.wme_chanParams.cap_wmeParams[pri].wmep_txopLimit);
  787         IEEE80211_UNLOCK(ic);
  788 
  789         /*
  790          * Check if the supplied frame can be aggregated.
  791          *
  792          * NB: we allow EAPOL frames to be aggregated with other ucast traffic.
  793          *     Do 802.1x EAPOL frames proceed in the clear? Then they couldn't
  794          *     be aggregated with other types of frames when encryption is on?
  795          */
  796         IEEE80211_FF_LOCK(ic);
  797         tap = &ni->ni_tx_ampdu[WME_AC_TO_TID(pri)];
  798         mstaged = ni->ni_tx_superg[WME_AC_TO_TID(pri)];
  799         /* XXX NOTE: reusing packet counter state from A-MPDU */
  800         /*
  801          * XXX NOTE: this means we're double-counting; it should just
  802          * be done in ieee80211_output.c once for both superg and A-MPDU.
  803          */
  804         ieee80211_txampdu_count_packet(tap);
  805 
  806         /*
  807          * When not in station mode never aggregate a multicast
  808          * frame; this insures, for example, that a combined frame
  809          * does not require multiple encryption keys.
  810          */
  811         if (vap->iv_opmode != IEEE80211_M_STA &&
  812             ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost)) {
  813                 /* XXX flush staged frame? */
  814                 IEEE80211_FF_UNLOCK(ic);
  815                 return m;
  816         }
  817         /*
  818          * If there is no frame to combine with and the pps is
  819          * too low; then do not attempt to aggregate this frame.
  820          */
  821         if (mstaged == NULL &&
  822             ieee80211_txampdu_getpps(tap) < ieee80211_ffppsmin) {
  823                 IEEE80211_FF_UNLOCK(ic);
  824                 return m;
  825         }
  826         sq = &sg->ff_stageq[pri];
  827         /*
  828          * Check the txop limit to insure the aggregate fits.
  829          */
  830         if (limit != 0 &&
  831             (txtime = ff_approx_txtime(ni, m, mstaged)) > limit) {
  832                 /*
  833                  * Aggregate too long, return to the caller for direct
  834                  * transmission.  In addition, flush any pending frame
  835                  * before sending this one.
  836                  */
  837                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  838                     "%s: txtime %u exceeds txop limit %u\n",
  839                     __func__, txtime, limit);
  840 
  841                 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
  842                 if (mstaged != NULL)
  843                         stageq_remove(ic, sq, mstaged);
  844                 IEEE80211_FF_UNLOCK(ic);
  845 
  846                 if (mstaged != NULL) {
  847                         IEEE80211_TX_LOCK(ic);
  848                         IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  849                             "%s: flush staged frame", __func__);
  850                         /* encap and xmit */
  851                         ff_transmit(ni, mstaged);
  852                         IEEE80211_TX_UNLOCK(ic);
  853                 }
  854                 return m;               /* NB: original frame */
  855         }
  856         /*
  857          * An aggregation candidate.  If there's a frame to partner
  858          * with then combine and return for processing.  Otherwise
  859          * save this frame and wait for a partner to show up (or
  860          * the frame to be flushed).  Note that staged frames also
  861          * hold their node reference.
  862          */
  863         if (mstaged != NULL) {
  864                 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = NULL;
  865                 stageq_remove(ic, sq, mstaged);
  866                 IEEE80211_FF_UNLOCK(ic);
  867 
  868                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  869                     "%s: aggregate fast-frame", __func__);
  870                 /*
  871                  * Release the node reference; we only need
  872                  * the one already in mstaged.
  873                  */
  874                 KASSERT(mstaged->m_pkthdr.rcvif == (void *)ni,
  875                     ("rcvif %p ni %p", mstaged->m_pkthdr.rcvif, ni));
  876                 ieee80211_free_node(ni);
  877 
  878                 m->m_nextpkt = NULL;
  879                 mstaged->m_nextpkt = m;
  880                 mstaged->m_flags |= M_FF; /* NB: mark for encap work */
  881         } else {
  882                 KASSERT(ni->ni_tx_superg[WME_AC_TO_TID(pri)] == NULL,
  883                     ("ni_tx_superg[]: %p",
  884                     ni->ni_tx_superg[WME_AC_TO_TID(pri)]));
  885                 ni->ni_tx_superg[WME_AC_TO_TID(pri)] = m;
  886 
  887                 stageq_add(ic, sq, m);
  888                 IEEE80211_FF_UNLOCK(ic);
  889 
  890                 IEEE80211_NOTE(vap, IEEE80211_MSG_SUPERG, ni,
  891                     "%s: stage frame, %u queued", __func__, sq->depth);
  892                 /* NB: mstaged is NULL */
  893         }
  894         return mstaged;
  895 }
  896 
  897 struct mbuf *
  898 ieee80211_amsdu_check(struct ieee80211_node *ni, struct mbuf *m)
  899 {
  900         /*
  901          * XXX TODO: actually enforce the node support
  902          * and HTCAP requirements for the maximum A-MSDU
  903          * size.
  904          */
  905 
  906         /* First: software A-MSDU transmit? */
  907         if (! ieee80211_amsdu_tx_ok(ni))
  908                 return (m);
  909 
  910         /* Next - EAPOL? Nope, don't aggregate; we don't QoS encap them */
  911         if (m->m_flags & (M_EAPOL | M_MCAST | M_BCAST))
  912                 return (m);
  913 
  914         /* Next - needs to be a data frame, non-broadcast, etc */
  915         if (ETHER_IS_MULTICAST(mtod(m, struct ether_header *)->ether_dhost))
  916                 return (m);
  917 
  918         return (ieee80211_ff_check(ni, m));
  919 }
  920 
  921 void
  922 ieee80211_ff_node_init(struct ieee80211_node *ni)
  923 {
  924         /*
  925          * Clean FF state on re-associate.  This handles the case
  926          * where a station leaves w/o notifying us and then returns
  927          * before node is reaped for inactivity.
  928          */
  929         ieee80211_ff_node_cleanup(ni);
  930 }
  931 
  932 void
  933 ieee80211_ff_node_cleanup(struct ieee80211_node *ni)
  934 {
  935         struct ieee80211com *ic = ni->ni_ic;
  936         struct ieee80211_superg *sg = ic->ic_superg;
  937         struct mbuf *m, *next_m, *head;
  938         int tid;
  939 
  940         IEEE80211_FF_LOCK(ic);
  941         head = NULL;
  942         for (tid = 0; tid < WME_NUM_TID; tid++) {
  943                 int ac = TID_TO_WME_AC(tid);
  944                 /*
  945                  * XXX Initialise the packet counter.
  946                  *
  947                  * This may be double-work for 11n stations;
  948                  * but without it we never setup things.
  949                  */
  950                 ieee80211_txampdu_init_pps(&ni->ni_tx_ampdu[tid]);
  951                 m = ni->ni_tx_superg[tid];
  952                 if (m != NULL) {
  953                         ni->ni_tx_superg[tid] = NULL;
  954                         stageq_remove(ic, &sg->ff_stageq[ac], m);
  955                         m->m_nextpkt = head;
  956                         head = m;
  957                 }
  958         }
  959         IEEE80211_FF_UNLOCK(ic);
  960 
  961         /*
  962          * Free mbufs, taking care to not dereference the mbuf after
  963          * we free it (hence grabbing m_nextpkt before we free it.)
  964          */
  965         m = head;
  966         while (m != NULL) {
  967                 next_m = m->m_nextpkt;
  968                 m_freem(m);
  969                 ieee80211_free_node(ni);
  970                 m = next_m;
  971         }
  972 }
  973 
  974 /*
  975  * Switch between turbo and non-turbo operating modes.
  976  * Use the specified channel flags to locate the new
  977  * channel, update 802.11 state, and then call back into
  978  * the driver to effect the change.
  979  */
  980 void
  981 ieee80211_dturbo_switch(struct ieee80211vap *vap, int newflags)
  982 {
  983         struct ieee80211com *ic = vap->iv_ic;
  984         struct ieee80211_channel *chan;
  985 
  986         chan = ieee80211_find_channel(ic, ic->ic_bsschan->ic_freq, newflags);
  987         if (chan == NULL) {             /* XXX should not happen */
  988                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  989                     "%s: no channel with freq %u flags 0x%x\n",
  990                     __func__, ic->ic_bsschan->ic_freq, newflags);
  991                 return;
  992         }
  993 
  994         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
  995             "%s: %s -> %s (freq %u flags 0x%x)\n", __func__,
  996             ieee80211_phymode_name[ieee80211_chan2mode(ic->ic_bsschan)],
  997             ieee80211_phymode_name[ieee80211_chan2mode(chan)],
  998             chan->ic_freq, chan->ic_flags);
  999 
 1000         ic->ic_bsschan = chan;
 1001         ic->ic_prevchan = ic->ic_curchan;
 1002         ic->ic_curchan = chan;
 1003         ic->ic_rt = ieee80211_get_ratetable(chan);
 1004         ic->ic_set_channel(ic);
 1005         ieee80211_radiotap_chan_change(ic);
 1006         /* NB: do not need to reset ERP state 'cuz we're in sta mode */
 1007 }
 1008 
 1009 /*
 1010  * Return the current ``state'' of an Atheros capbility.
 1011  * If associated in station mode report the negotiated
 1012  * setting. Otherwise report the current setting.
 1013  */
 1014 static int
 1015 getathcap(struct ieee80211vap *vap, int cap)
 1016 {
 1017         if (vap->iv_opmode == IEEE80211_M_STA &&
 1018             vap->iv_state == IEEE80211_S_RUN)
 1019                 return IEEE80211_ATH_CAP(vap, vap->iv_bss, cap) != 0;
 1020         else
 1021                 return (vap->iv_flags & cap) != 0;
 1022 }
 1023 
 1024 static int
 1025 superg_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 1026 {
 1027         switch (ireq->i_type) {
 1028         case IEEE80211_IOC_FF:
 1029                 ireq->i_val = getathcap(vap, IEEE80211_F_FF);
 1030                 break;
 1031         case IEEE80211_IOC_TURBOP:
 1032                 ireq->i_val = getathcap(vap, IEEE80211_F_TURBOP);
 1033                 break;
 1034         default:
 1035                 return ENOSYS;
 1036         }
 1037         return 0;
 1038 }
 1039 IEEE80211_IOCTL_GET(superg, superg_ioctl_get80211);
 1040 
 1041 static int
 1042 superg_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
 1043 {
 1044         switch (ireq->i_type) {
 1045         case IEEE80211_IOC_FF:
 1046                 if (ireq->i_val) {
 1047                         if ((vap->iv_caps & IEEE80211_C_FF) == 0)
 1048                                 return EOPNOTSUPP;
 1049                         vap->iv_flags |= IEEE80211_F_FF;
 1050                 } else
 1051                         vap->iv_flags &= ~IEEE80211_F_FF;
 1052                 return ENETRESET;
 1053         case IEEE80211_IOC_TURBOP:
 1054                 if (ireq->i_val) {
 1055                         if ((vap->iv_caps & IEEE80211_C_TURBOP) == 0)
 1056                                 return EOPNOTSUPP;
 1057                         vap->iv_flags |= IEEE80211_F_TURBOP;
 1058                 } else
 1059                         vap->iv_flags &= ~IEEE80211_F_TURBOP;
 1060                 return ENETRESET;
 1061         default:
 1062                 return ENOSYS;
 1063         }
 1064 }
 1065 IEEE80211_IOCTL_SET(superg, superg_ioctl_set80211);
 1066 
 1067 #endif  /* IEEE80211_SUPPORT_SUPERG */
Cache object: c3e8b4850da0089263e1f966b059f8cc
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.
FreeBSD/Linux Kernel Cross Reference sys/net80211/ieee80211_superg.c

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_superg.c
