The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_mesh.h

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    1 /*- 
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2009 The FreeBSD Foundation 
    5  * All rights reserved. 
    6  * 
    7  * This software was developed by Rui Paulo under sponsorship from the
    8  * FreeBSD Foundation. 
    9  *  
   10  * Redistribution and use in source and binary forms, with or without 
   11  * modification, are permitted provided that the following conditions 
   12  * are met: 
   13  * 1. Redistributions of source code must retain the above copyright 
   14  *    notice, this list of conditions and the following disclaimer. 
   15  * 2. Redistributions in binary form must reproduce the above copyright 
   16  *    notice, this list of conditions and the following disclaimer in the 
   17  *    documentation and/or other materials provided with the distribution. 
   18  * 
   19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
   29  * SUCH DAMAGE. 
   30  * 
   31  * $FreeBSD$
   32  */
   33 #ifndef _NET80211_IEEE80211_MESH_H_
   34 #define _NET80211_IEEE80211_MESH_H_
   35 
   36 #define IEEE80211_MESH_DEFAULT_TTL      31
   37 #define IEEE80211_MESH_MAX_NEIGHBORS    15
   38 
   39 /*
   40  * NB: all structures are __packed  so sizeof works on arm, et. al.
   41  */
   42 /*
   43  * 802.11s Information Elements.
   44 */
   45 /* Mesh Configuration */
   46 #define IEEE80211_MESH_CONF_SZ          (7)
   47 struct ieee80211_meshconf_ie {
   48         uint8_t         conf_ie;        /* IEEE80211_ELEMID_MESHCONF */
   49         uint8_t         conf_len;
   50         uint8_t         conf_pselid;    /* Active Path Sel. Proto. ID */
   51         uint8_t         conf_pmetid;    /* Active Metric Identifier */
   52         uint8_t         conf_ccid;      /* Congestion Control Mode ID  */
   53         uint8_t         conf_syncid;    /* Sync. Protocol ID */
   54         uint8_t         conf_authid;    /* Auth. Protocol ID */
   55         uint8_t         conf_form;      /* Formation Information */
   56         uint8_t         conf_cap;
   57 } __packed;
   58 
   59 /* Hybrid Wireless Mesh Protocol */
   60 enum {
   61         /* 0 reserved */
   62         IEEE80211_MESHCONF_PATH_HWMP            = 1,
   63         /* 2-254 reserved */
   64         IEEE80211_MESHCONF_PATH_VENDOR          = 255,
   65 };
   66 
   67 /* Airtime Link Metric */
   68 enum {
   69         /* 0 reserved */
   70         IEEE80211_MESHCONF_METRIC_AIRTIME       = 1,
   71         /* 2-254 reserved */
   72         IEEE80211_MESHCONF_METRIC_VENDOR        = 255,
   73 };
   74 
   75 /* Congestion Control */
   76 enum {
   77         IEEE80211_MESHCONF_CC_DISABLED          = 0,
   78         IEEE80211_MESHCONF_CC_SIG               = 1,
   79         /* 2-254 reserved */
   80         IEEE80211_MESHCONF_CC_VENDOR            = 255,
   81 };
   82 
   83 /* Neighbour Offset */
   84 enum {
   85         /* 0 reserved */
   86         IEEE80211_MESHCONF_SYNC_NEIGHOFF        = 1,
   87         /* 2-254 rserved */
   88         IEEE80211_MESHCONF_SYNC_VENDOR          = 255,
   89 };
   90 
   91 /* Authentication Protocol Identifier */
   92 enum {
   93         IEEE80211_MESHCONF_AUTH_DISABLED        = 0,
   94         /* Simultaneous Authenticaction of Equals */
   95         IEEE80211_MESHCONF_AUTH_SEA             = 1,
   96         IEEE80211_MESHCONF_AUTH_8021X           = 2, /* IEEE 802.1X */
   97         /* 3-254 reserved */
   98         IEEE80211_MESHCONF_AUTH_VENDOR          = 255,
   99 };
  100 
  101 /* Mesh Formation Info */
  102 #define IEEE80211_MESHCONF_FORM_GATE    0x01    /* Connected to Gate */
  103 #define IEEE80211_MESHCONF_FORM_NNEIGH_MASK 0x7E /* Number of Neighbours */
  104 #define IEEE80211_MESHCONF_FORM_SA      0xF0    /* indicating 802.1X auth */
  105 
  106 /* Mesh Capability */
  107 #define IEEE80211_MESHCONF_CAP_AP       0x01    /* Accepting Peers */
  108 #define IEEE80211_MESHCONF_CAP_MCCAS    0x02    /* MCCA supported */
  109 #define IEEE80211_MESHCONF_CAP_MCCAE    0x04    /* MCCA enabled */
  110 #define IEEE80211_MESHCONF_CAP_FWRD     0x08    /* forwarding enabled */
  111 #define IEEE80211_MESHCONF_CAP_BTR      0x10    /* Beacon Timing Report Enab */
  112 #define IEEE80211_MESHCONF_CAP_TBTT     0x20    /* TBTT Adjusting  */
  113 #define IEEE80211_MESHCONF_CAP_PSL      0x40    /* Power Save Level */
  114 /* 0x80 reserved */
  115 
  116 /* Mesh Identifier */
  117 struct ieee80211_meshid_ie {
  118         uint8_t         id_ie;          /* IEEE80211_ELEMID_MESHID */
  119         uint8_t         id_len;
  120 } __packed;
  121 
  122 /* Link Metric Report */
  123 struct ieee80211_meshlmetric_ie {
  124         uint8_t         lm_ie;  /* IEEE80211_ACTION_MESH_LMETRIC */
  125         uint8_t         lm_len;
  126         uint8_t         lm_flags;
  127 #define IEEE80211_MESH_LMETRIC_FLAGS_REQ        0x01    /* Request */
  128         /*
  129          * XXX: this field should be variable in size and depend on
  130          * the active active path selection metric identifier
  131          */
  132         uint32_t        lm_metric;
  133 #define IEEE80211_MESHLMETRIC_INITIALVAL        0
  134 } __packed;
  135 
  136 /* Congestion Notification */
  137 struct ieee80211_meshcngst_ie {
  138         uint8_t         cngst_ie;       /* IEEE80211_ELEMID_MESHCNGST */
  139         uint8_t         cngst_len;
  140         uint16_t        cngst_timer[4]; /* Expiration Timers: AC_BK,
  141                                            AC_BE, AC_VI, AC_VO */
  142 } __packed;
  143 
  144 /* Peer Link Management */
  145 #define IEEE80211_MPM_BASE_SZ   (4)
  146 #define IEEE80211_MPM_MAX_SZ    (8)
  147 struct ieee80211_meshpeer_ie {
  148         uint8_t         peer_ie;        /* IEEE80211_ELEMID_MESHPEER */
  149         uint8_t         peer_len;
  150         uint16_t        peer_proto;     /* Peer Management Protocol */
  151         uint16_t        peer_llinkid;   /* Local Link ID */
  152         uint16_t        peer_linkid;    /* Peer Link ID */
  153         uint16_t        peer_rcode;
  154 } __packed;
  155 
  156 /* Mesh Peering Protocol Identifier field value */
  157 enum {
  158         IEEE80211_MPPID_MPM             = 0,    /* Mesh peering management */
  159         IEEE80211_MPPID_AUTH_MPM        = 1,    /* Auth. mesh peering exchange */
  160         /* 2-65535 reserved */
  161 };
  162 
  163 #ifdef notyet
  164 /* Mesh Channel Switch Annoucement */
  165 struct ieee80211_meshcsa_ie {
  166         uint8_t         csa_ie;         /* IEEE80211_ELEMID_MESHCSA */
  167         uint8_t         csa_len;
  168         uint8_t         csa_mode;
  169         uint8_t         csa_newclass;   /* New Regulatory Class */
  170         uint8_t         csa_newchan;
  171         uint8_t         csa_precvalue;  /* Precedence Value */
  172         uint8_t         csa_count;
  173 } __packed;
  174 
  175 /* Mesh TIM */
  176 /* Equal to the non Mesh version */
  177 
  178 /* Mesh Awake Window */
  179 struct ieee80211_meshawakew_ie {
  180         uint8_t         awakew_ie;              /* IEEE80211_ELEMID_MESHAWAKEW */
  181         uint8_t         awakew_len;
  182         uint8_t         awakew_windowlen;       /* in TUs */
  183 } __packed;
  184 
  185 /* Mesh Beacon Timing */
  186 struct ieee80211_meshbeacont_ie {
  187         uint8_t         beacont_ie;             /* IEEE80211_ELEMID_MESHBEACONT */
  188         uint8_t         beacont_len;
  189         struct {
  190                 uint8_t         mp_aid;         /* Least Octet of AID */
  191                 uint16_t        mp_btime;       /* Beacon Time */
  192                 uint16_t        mp_bint;        /* Beacon Interval */
  193         } __packed mp[1];                       /* NB: variable size */
  194 } __packed;
  195 #endif
  196 
  197 /* Gate (GANN) Annoucement */
  198 /*
  199  * NB: these macros used for the length in the IEs does not include 2 bytes
  200  * for _ie and _len fields as is defined by the standard.
  201  */
  202 #define IEEE80211_MESHGANN_BASE_SZ      (15)
  203 struct ieee80211_meshgann_ie {
  204         uint8_t         gann_ie;                /* IEEE80211_ELEMID_MESHGANN */
  205         uint8_t         gann_len;
  206         uint8_t         gann_flags;
  207         uint8_t         gann_hopcount;
  208         uint8_t         gann_ttl;
  209         uint8_t         gann_addr[IEEE80211_ADDR_LEN];
  210         uint32_t        gann_seq;               /* GANN Sequence Number */
  211         uint16_t        gann_interval;          /* GANN Interval */
  212 } __packed;
  213 
  214 /* Root (MP) Annoucement */
  215 #define IEEE80211_MESHRANN_BASE_SZ      (21)
  216 struct ieee80211_meshrann_ie {
  217         uint8_t         rann_ie;                /* IEEE80211_ELEMID_MESHRANN */
  218         uint8_t         rann_len;
  219         uint8_t         rann_flags;
  220 #define IEEE80211_MESHRANN_FLAGS_GATE   0x01    /* Mesh Gate */
  221         uint8_t         rann_hopcount;
  222         uint8_t         rann_ttl;
  223         uint8_t         rann_addr[IEEE80211_ADDR_LEN];
  224         uint32_t        rann_seq;               /* HWMP Sequence Number */
  225         uint32_t        rann_interval;
  226         uint32_t        rann_metric;
  227 } __packed;
  228 
  229 /* Mesh Path Request */
  230 #define IEEE80211_MESHPREQ_BASE_SZ              (26)
  231 #define IEEE80211_MESHPREQ_BASE_SZ_AE           (32)
  232 #define IEEE80211_MESHPREQ_TRGT_SZ              (11)
  233 #define IEEE80211_MESHPREQ_TCNT_OFFSET          (27)
  234 #define IEEE80211_MESHPREQ_TCNT_OFFSET_AE       (33)
  235 struct ieee80211_meshpreq_ie {
  236         uint8_t         preq_ie;        /* IEEE80211_ELEMID_MESHPREQ */
  237         uint8_t         preq_len;
  238         uint8_t         preq_flags;
  239 #define IEEE80211_MESHPREQ_FLAGS_GATE   0x01    /* Mesh Gate */
  240 #define IEEE80211_MESHPREQ_FLAGS_AM     0x02    /* 0 = bcast / 1 = ucast */
  241 #define IEEE80211_MESHPREQ_FLAGS_PP     0x04    /* Proactive PREP */
  242 #define IEEE80211_MESHPREQ_FLAGS_AE     0x40    /* Address Extension */
  243         uint8_t         preq_hopcount;
  244         uint8_t         preq_ttl;
  245         uint32_t        preq_id;
  246         uint8_t         preq_origaddr[IEEE80211_ADDR_LEN];
  247         uint32_t        preq_origseq;   /* HWMP Sequence Number */
  248         /* NB: may have Originator External Address */
  249         uint8_t         preq_orig_ext_addr[IEEE80211_ADDR_LEN];
  250         uint32_t        preq_lifetime;
  251         uint32_t        preq_metric;
  252         uint8_t         preq_tcount;    /* target count */
  253         struct {
  254                 uint8_t         target_flags;
  255 #define IEEE80211_MESHPREQ_TFLAGS_TO    0x01    /* Target Only */
  256 #define IEEE80211_MESHPREQ_TFLAGS_USN   0x04    /* Unknown HWMP seq number */
  257                 uint8_t         target_addr[IEEE80211_ADDR_LEN];
  258                 uint32_t        target_seq;     /* HWMP Sequence Number */
  259         } __packed preq_targets[1];             /* NB: variable size */
  260 } __packed;
  261 
  262 /* Mesh Path Reply */
  263 #define IEEE80211_MESHPREP_BASE_SZ      (31)
  264 #define IEEE80211_MESHPREP_BASE_SZ_AE   (37)
  265 struct ieee80211_meshprep_ie {
  266         uint8_t         prep_ie;        /* IEEE80211_ELEMID_MESHPREP */
  267         uint8_t         prep_len;
  268         uint8_t         prep_flags;
  269 #define IEEE80211_MESHPREP_FLAGS_AE     0x40    /* Address Extension */
  270         uint8_t         prep_hopcount;
  271         uint8_t         prep_ttl;
  272         uint8_t         prep_targetaddr[IEEE80211_ADDR_LEN];
  273         uint32_t        prep_targetseq;
  274         /* NB: May have Target External Address */
  275         uint8_t         prep_target_ext_addr[IEEE80211_ADDR_LEN];
  276         uint32_t        prep_lifetime;
  277         uint32_t        prep_metric;
  278         uint8_t         prep_origaddr[IEEE80211_ADDR_LEN];
  279         uint32_t        prep_origseq;   /* HWMP Sequence Number */
  280 } __packed;
  281 
  282 /* Mesh Path Error */
  283 #define IEEE80211_MESHPERR_MAXDEST      (19)
  284 #define IEEE80211_MESHPERR_NDEST_OFFSET (3)
  285 #define IEEE80211_MESHPERR_BASE_SZ      (2)
  286 #define IEEE80211_MESHPERR_DEST_SZ      (13)
  287 #define IEEE80211_MESHPERR_DEST_SZ_AE   (19)
  288 struct ieee80211_meshperr_ie {
  289         uint8_t         perr_ie;        /* IEEE80211_ELEMID_MESHPERR */
  290         uint8_t         perr_len;
  291         uint8_t         perr_ttl;
  292         uint8_t         perr_ndests;    /* Number of Destinations */
  293         struct {
  294                 uint8_t         dest_flags;
  295 #define IEEE80211_MESHPERR_DFLAGS_USN   0x01    /* XXX: not part of standard */
  296 #define IEEE80211_MESHPERR_DFLAGS_RC    0x02    /* XXX: not part of standard */
  297 #define IEEE80211_MESHPERR_FLAGS_AE     0x40    /* Address Extension */
  298                 uint8_t         dest_addr[IEEE80211_ADDR_LEN];
  299                 uint32_t        dest_seq;       /* HWMP Sequence Number */
  300                 /* NB: May have Destination External Address */
  301                 uint8_t         dest_ext_addr[IEEE80211_ADDR_LEN];
  302                 uint16_t        dest_rcode;
  303         } __packed perr_dests[1];               /* NB: variable size */
  304 } __packed;
  305 
  306 #ifdef notyet
  307 /* Mesh Proxy Update */
  308 struct ieee80211_meshpu_ie {
  309         uint8_t         pu_ie;          /* IEEE80211_ELEMID_MESHPU */
  310         uint8_t         pu_len;
  311         uint8_t         pu_flags;
  312 #define IEEE80211_MESHPU_FLAGS_MASK             0x1
  313 #define IEEE80211_MESHPU_FLAGS_DEL              0x0
  314 #define IEEE80211_MESHPU_FLAGS_ADD              0x1
  315         uint8_t         pu_seq;         /* PU Sequence Number */
  316         uint8_t         pu_addr[IEEE80211_ADDR_LEN];
  317         uint8_t         pu_naddr;       /* Number of Proxied Addresses */
  318         /* NB: proxied address follows */
  319 } __packed;
  320 
  321 /* Mesh Proxy Update Confirmation */
  322 struct ieee80211_meshpuc_ie {
  323         uint8_t         puc_ie;         /* IEEE80211_ELEMID_MESHPUC */
  324         uint8_t         puc_len;
  325         uint8_t         puc_flags;
  326         uint8_t         puc_seq;        /* PU Sequence Number */
  327         uint8_t         puc_daddr[IEEE80211_ADDR_LEN];
  328 } __packed;
  329 #endif
  330 
  331 /*
  332  * 802.11s Action Frames
  333  * XXX: these are wrong, and some of them should be
  334  * under MESH category while PROXY is under MULTIHOP category.
  335  */
  336 #define IEEE80211_ACTION_CAT_INTERWORK          15
  337 #define IEEE80211_ACTION_CAT_RESOURCE           16
  338 #define IEEE80211_ACTION_CAT_PROXY              17
  339 
  340 /*
  341  * Mesh Peering Action codes.
  342  */
  343 enum {
  344         /* 0 reserved */
  345         IEEE80211_ACTION_MESHPEERING_OPEN       = 1,
  346         IEEE80211_ACTION_MESHPEERING_CONFIRM    = 2,
  347         IEEE80211_ACTION_MESHPEERING_CLOSE      = 3,
  348         /* 4-255 reserved */
  349 };
  350 
  351 /*
  352  * Mesh Action code.
  353  */
  354 enum {
  355         IEEE80211_ACTION_MESH_LMETRIC   = 0,    /* Mesh Link Metric Report */
  356         IEEE80211_ACTION_MESH_HWMP      = 1,    /* HWMP Mesh Path Selection */
  357         IEEE80211_ACTION_MESH_GANN      = 2,    /* Gate Announcement */
  358         IEEE80211_ACTION_MESH_CC        = 3,    /* Congestion Control */
  359         IEEE80211_ACTION_MESH_MCCA_SREQ = 4,    /* MCCA Setup Request */
  360         IEEE80211_ACTION_MESH_MCCA_SREP = 5,    /* MCCA Setup Reply */
  361         IEEE80211_ACTION_MESH_MCCA_AREQ = 6,    /* MCCA Advertisement Req. */
  362         IEEE80211_ACTION_MESH_MCCA_ADVER =7,    /* MCCA Advertisement */
  363         IEEE80211_ACTION_MESH_MCCA_TRDOWN = 8,  /* MCCA Teardown */
  364         IEEE80211_ACTION_MESH_TBTT_REQ  = 9,    /* TBTT Adjustment Request */
  365         IEEE80211_ACTION_MESH_TBTT_RES  = 10,   /* TBTT Adjustment Response */
  366         /* 11-255 reserved */
  367 };
  368 
  369 /*
  370  * Different mesh control structures based on the AE
  371  * (Address Extension) bits.
  372  */
  373 struct ieee80211_meshcntl {
  374         uint8_t         mc_flags;       /* Address Extension 00 */
  375         uint8_t         mc_ttl;         /* TTL */
  376         uint8_t         mc_seq[4];      /* Sequence No. */
  377         /* NB: more addresses may follow */
  378 } __packed;
  379 
  380 struct ieee80211_meshcntl_ae01 {
  381         uint8_t         mc_flags;       /* Address Extension 01 */
  382         uint8_t         mc_ttl;         /* TTL */
  383         uint8_t         mc_seq[4];      /* Sequence No. */
  384         uint8_t         mc_addr4[IEEE80211_ADDR_LEN];
  385 } __packed;
  386 
  387 struct ieee80211_meshcntl_ae10 {
  388         uint8_t         mc_flags;       /* Address Extension 10 */
  389         uint8_t         mc_ttl;         /* TTL */
  390         uint8_t         mc_seq[4];      /* Sequence No. */
  391         uint8_t         mc_addr5[IEEE80211_ADDR_LEN];
  392         uint8_t         mc_addr6[IEEE80211_ADDR_LEN];
  393 } __packed;
  394 
  395 #define IEEE80211_MESH_AE_MASK          0x03
  396 enum {
  397         IEEE80211_MESH_AE_00            = 0,    /* MC has no AE subfield */
  398         IEEE80211_MESH_AE_01            = 1,    /* MC contain addr4 */
  399         IEEE80211_MESH_AE_10            = 2,    /* MC contain addr5 & addr6 */
  400         IEEE80211_MESH_AE_11            = 3,    /* RESERVED */
  401 };
  402 
  403 #ifdef _KERNEL
  404 MALLOC_DECLARE(M_80211_MESH_PREQ);
  405 MALLOC_DECLARE(M_80211_MESH_PREP);
  406 MALLOC_DECLARE(M_80211_MESH_PERR);
  407 
  408 MALLOC_DECLARE(M_80211_MESH_RT);
  409 MALLOC_DECLARE(M_80211_MESH_GT_RT);
  410 /*
  411  * Basic forwarding information:
  412  * o Destination MAC
  413  * o Next-hop MAC
  414  * o Precursor list (not implemented yet)
  415  * o Path timeout
  416  * The rest is part of the active Mesh path selection protocol.
  417  * XXX: to be moved out later.
  418  */
  419 struct ieee80211_mesh_route {
  420         TAILQ_ENTRY(ieee80211_mesh_route)       rt_next;
  421         struct ieee80211vap     *rt_vap;
  422         ieee80211_rte_lock_t    rt_lock;        /* fine grained route lock */
  423         struct callout          rt_discovery;   /* discovery timeout */
  424         int                     rt_updtime;     /* last update time */
  425         uint8_t                 rt_dest[IEEE80211_ADDR_LEN];
  426         uint8_t                 rt_mesh_gate[IEEE80211_ADDR_LEN]; /* meshDA */
  427         uint8_t                 rt_nexthop[IEEE80211_ADDR_LEN];
  428         uint32_t                rt_metric;      /* path metric */
  429         uint16_t                rt_nhops;       /* number of hops */
  430         uint16_t                rt_flags;
  431 #define IEEE80211_MESHRT_FLAGS_DISCOVER 0x01    /* path discovery */
  432 #define IEEE80211_MESHRT_FLAGS_VALID    0x02    /* path discovery complete */
  433 #define IEEE80211_MESHRT_FLAGS_PROXY    0x04    /* proxy entry */
  434 #define IEEE80211_MESHRT_FLAGS_GATE     0x08    /* mesh gate entry */
  435         uint32_t                rt_lifetime;    /* route timeout */
  436         uint32_t                rt_lastmseq;    /* last seq# seen dest */
  437         uint32_t                rt_ext_seq;     /* proxy seq number */
  438         void                    *rt_priv;       /* private data */
  439 };
  440 #define IEEE80211_MESH_ROUTE_PRIV(rt, cast)     ((cast *)rt->rt_priv)
  441 
  442 /*
  443  * Stored information about known mesh gates.
  444  */
  445 struct ieee80211_mesh_gate_route {
  446         TAILQ_ENTRY(ieee80211_mesh_gate_route)  gr_next;
  447         uint8_t                         gr_addr[IEEE80211_ADDR_LEN];
  448         uint32_t                        gr_lastseq;
  449         struct ieee80211_mesh_route     *gr_route;
  450 };
  451 
  452 #define IEEE80211_MESH_PROTO_DSZ        12      /* description size */
  453 /*
  454  * Mesh Path Selection Protocol.
  455  */
  456 enum ieee80211_state;
  457 struct ieee80211_mesh_proto_path {
  458         uint8_t         mpp_active;
  459         char            mpp_descr[IEEE80211_MESH_PROTO_DSZ];
  460         uint8_t         mpp_ie;
  461         struct ieee80211_node *
  462                         (*mpp_discover)(struct ieee80211vap *,
  463                                 const uint8_t [IEEE80211_ADDR_LEN],
  464                                 struct mbuf *);
  465         void            (*mpp_peerdown)(struct ieee80211_node *);
  466         void            (*mpp_senderror)(struct ieee80211vap *,
  467                                 const uint8_t [IEEE80211_ADDR_LEN],
  468                                 struct ieee80211_mesh_route *, int);
  469         void            (*mpp_vattach)(struct ieee80211vap *);
  470         void            (*mpp_vdetach)(struct ieee80211vap *);
  471         int             (*mpp_newstate)(struct ieee80211vap *,
  472                             enum ieee80211_state, int);
  473         const size_t    mpp_privlen;    /* size required in the routing table
  474                                            for private data */
  475         int             mpp_inact;      /* inact. timeout for invalid routes
  476                                            (ticks) */
  477 };
  478 
  479 /*
  480  * Mesh Link Metric Report Protocol.
  481  */
  482 struct ieee80211_mesh_proto_metric {
  483         uint8_t         mpm_active;
  484         char            mpm_descr[IEEE80211_MESH_PROTO_DSZ];
  485         uint8_t         mpm_ie;
  486         uint32_t        (*mpm_metric)(struct ieee80211_node *);
  487 };
  488 
  489 #ifdef notyet
  490 /*
  491  * Mesh Authentication Protocol.
  492  */
  493 struct ieee80211_mesh_proto_auth {
  494         uint8_t         mpa_ie[4];
  495 };
  496 
  497 struct ieee80211_mesh_proto_congestion {
  498 };
  499 
  500 struct ieee80211_mesh_proto_sync {
  501 };
  502 #endif
  503 
  504 typedef uint32_t ieee80211_mesh_seq;
  505 #define IEEE80211_MESH_SEQ_LEQ(a, b)    ((int32_t)((a)-(b)) <= 0)
  506 #define IEEE80211_MESH_SEQ_GEQ(a, b)    ((int32_t)((a)-(b)) >= 0)
  507 
  508 struct ieee80211_mesh_state {
  509         int                             ms_idlen;
  510         uint8_t                         ms_id[IEEE80211_MESHID_LEN];
  511         ieee80211_mesh_seq              ms_seq; /* seq no for meshcntl */
  512         uint16_t                        ms_neighbors;
  513         uint8_t                         ms_ttl; /* mesh ttl set in packets */
  514 #define IEEE80211_MESHFLAGS_AP          0x01    /* accept peers */
  515 #define IEEE80211_MESHFLAGS_GATE        0x02    /* mesh gate role */
  516 #define IEEE80211_MESHFLAGS_FWD         0x04    /* forward packets */
  517 #define IEEE80211_MESHFLAGS_ROOT        0x08    /* configured as root */
  518         uint8_t                         ms_flags;
  519         ieee80211_rt_lock_t             ms_rt_lock;
  520         struct callout                  ms_cleantimer;
  521         struct callout                  ms_gatetimer;
  522         ieee80211_mesh_seq              ms_gateseq;
  523         TAILQ_HEAD(, ieee80211_mesh_gate_route) ms_known_gates;
  524         TAILQ_HEAD(, ieee80211_mesh_route)  ms_routes;
  525         struct ieee80211_mesh_proto_metric *ms_pmetric;
  526         struct ieee80211_mesh_proto_path   *ms_ppath;
  527 };
  528 void            ieee80211_mesh_attach(struct ieee80211com *);
  529 void            ieee80211_mesh_detach(struct ieee80211com *);
  530 
  531 struct ieee80211_mesh_route *
  532                 ieee80211_mesh_rt_find(struct ieee80211vap *,
  533                     const uint8_t [IEEE80211_ADDR_LEN]);
  534 struct ieee80211_mesh_route *
  535                 ieee80211_mesh_rt_add(struct ieee80211vap *,
  536                     const uint8_t [IEEE80211_ADDR_LEN]);
  537 void            ieee80211_mesh_rt_del(struct ieee80211vap *,
  538                     const uint8_t [IEEE80211_ADDR_LEN]);
  539 void            ieee80211_mesh_rt_flush(struct ieee80211vap *);
  540 void            ieee80211_mesh_rt_flush_peer(struct ieee80211vap *,
  541                     const uint8_t [IEEE80211_ADDR_LEN]);
  542 int             ieee80211_mesh_rt_update(struct ieee80211_mesh_route *rt, int);
  543 void            ieee80211_mesh_proxy_check(struct ieee80211vap *,
  544                     const uint8_t [IEEE80211_ADDR_LEN]);
  545 
  546 int             ieee80211_mesh_register_proto_path(const
  547                     struct ieee80211_mesh_proto_path *);
  548 int             ieee80211_mesh_register_proto_metric(const
  549                     struct ieee80211_mesh_proto_metric *);
  550 
  551 uint8_t *       ieee80211_add_meshid(uint8_t *, struct ieee80211vap *);
  552 uint8_t *       ieee80211_add_meshconf(uint8_t *, struct ieee80211vap *);
  553 uint8_t *       ieee80211_add_meshpeer(uint8_t *, uint8_t, uint16_t, uint16_t,
  554                     uint16_t);
  555 uint8_t *       ieee80211_add_meshlmetric(uint8_t *, uint8_t, uint32_t);
  556 uint8_t *       ieee80211_add_meshgate(uint8_t *,
  557                     struct ieee80211_meshgann_ie *);
  558 
  559 void            ieee80211_mesh_node_init(struct ieee80211vap *,
  560                     struct ieee80211_node *);
  561 void            ieee80211_mesh_node_cleanup(struct ieee80211_node *);
  562 void            ieee80211_parse_meshid(struct ieee80211_node *,
  563                     const uint8_t *);
  564 struct ieee80211_scanparams;
  565 void            ieee80211_mesh_init_neighbor(struct ieee80211_node *,
  566                    const struct ieee80211_frame *,
  567                    const struct ieee80211_scanparams *);
  568 void            ieee80211_mesh_update_beacon(struct ieee80211vap *,
  569                     struct ieee80211_beacon_offsets *);
  570 struct ieee80211_mesh_gate_route *
  571                 ieee80211_mesh_mark_gate(struct ieee80211vap *,
  572                     const uint8_t *, struct ieee80211_mesh_route *);
  573 void            ieee80211_mesh_forward_to_gates(struct ieee80211vap *,
  574                     struct ieee80211_mesh_route *);
  575 struct ieee80211_node *
  576                 ieee80211_mesh_find_txnode(struct ieee80211vap *,
  577                     const uint8_t [IEEE80211_ADDR_LEN]);
  578 
  579 /*
  580  * Return non-zero if proxy operation is enabled.
  581  */
  582 static __inline int
  583 ieee80211_mesh_isproxyena(struct ieee80211vap *vap)
  584 {
  585         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  586         return (ms->ms_flags &
  587             (IEEE80211_MESHFLAGS_AP | IEEE80211_MESHFLAGS_GATE)) != 0;
  588 }
  589 
  590 /*
  591  * Process an outbound frame: if a path is known to the
  592  * destination then return a reference to the next hop
  593  * for immediate transmission.  Otherwise initiate path
  594  * discovery and, if possible queue the packet to be
  595  * sent when path discovery completes.
  596  */
  597 static __inline struct ieee80211_node *
  598 ieee80211_mesh_discover(struct ieee80211vap *vap,
  599     const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
  600 {
  601         struct ieee80211_mesh_state *ms = vap->iv_mesh;
  602         return ms->ms_ppath->mpp_discover(vap, dest, m);
  603 }
  604 
  605 #endif /* _KERNEL */
  606 #endif /* !_NET80211_IEEE80211_MESH_H_ */

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