The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_proto.h

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    1 /*-
    2  * Copyright (c) 2001 Atsushi Onoe
    3  * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote products
   15  *    derived from this software without specific prior written permission.
   16  *
   17  * Alternatively, this software may be distributed under the terms of the
   18  * GNU General Public License ("GPL") version 2 as published by the Free
   19  * Software Foundation.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   22  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   23  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   24  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   25  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   26  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   30  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   31  *
   32  * $FreeBSD: releng/6.4/sys/net80211/ieee80211_proto.h 167397 2007-03-10 00:33:47Z sam $
   33  */
   34 #ifndef _NET80211_IEEE80211_PROTO_H_
   35 #define _NET80211_IEEE80211_PROTO_H_
   36 
   37 /*
   38  * 802.11 protocol implementation definitions.
   39  */
   40 
   41 enum ieee80211_state {
   42         IEEE80211_S_INIT        = 0,    /* default state */
   43         IEEE80211_S_SCAN        = 1,    /* scanning */
   44         IEEE80211_S_AUTH        = 2,    /* try to authenticate */
   45         IEEE80211_S_ASSOC       = 3,    /* try to assoc */
   46         IEEE80211_S_RUN         = 4,    /* associated */
   47 };
   48 #define IEEE80211_S_MAX         (IEEE80211_S_RUN+1)
   49 
   50 #define IEEE80211_SEND_MGMT(_ic,_ni,_type,_arg) \
   51         ((*(_ic)->ic_send_mgmt)(_ic, _ni, _type, _arg))
   52 
   53 extern  const char *ieee80211_mgt_subtype_name[];
   54 extern  const char *ieee80211_phymode_name[];
   55 
   56 void    ieee80211_proto_attach(struct ieee80211com *);
   57 void    ieee80211_proto_detach(struct ieee80211com *);
   58 
   59 struct ieee80211_node;
   60 int     ieee80211_input(struct ieee80211com *, struct mbuf *,
   61                 struct ieee80211_node *, int, u_int32_t);
   62 int     ieee80211_setup_rates(struct ieee80211_node *ni,
   63                 const u_int8_t *rates, const u_int8_t *xrates, int flags);
   64 void    ieee80211_saveie(u_int8_t **, const u_int8_t *);
   65 void    ieee80211_recv_mgmt(struct ieee80211com *, struct mbuf *,
   66                 struct ieee80211_node *, int, int, u_int32_t);
   67 int     ieee80211_send_nulldata(struct ieee80211_node *);
   68 int     ieee80211_send_probereq(struct ieee80211_node *ni,
   69                 const u_int8_t sa[IEEE80211_ADDR_LEN],
   70                 const u_int8_t da[IEEE80211_ADDR_LEN],
   71                 const u_int8_t bssid[IEEE80211_ADDR_LEN],
   72                 const u_int8_t *ssid, size_t ssidlen,
   73                 const void *optie, size_t optielen);
   74 int     ieee80211_send_mgmt(struct ieee80211com *, struct ieee80211_node *,
   75                 int, int);
   76 int     ieee80211_classify(struct ieee80211com *, struct mbuf *,
   77                 struct ieee80211_node *);
   78 struct mbuf *ieee80211_encap(struct ieee80211com *, struct mbuf *,
   79                 struct ieee80211_node *);
   80 void    ieee80211_pwrsave(struct ieee80211com *, struct ieee80211_node *, 
   81                 struct mbuf *);
   82 
   83 void    ieee80211_reset_erp(struct ieee80211com *);
   84 void    ieee80211_set_shortslottime(struct ieee80211com *, int onoff);
   85 int     ieee80211_iserp_rateset(struct ieee80211com *,
   86                 struct ieee80211_rateset *);
   87 void    ieee80211_set11gbasicrates(struct ieee80211_rateset *,
   88                 enum ieee80211_phymode);
   89 
   90 /*
   91  * Return the size of the 802.11 header for a management or data frame.
   92  */
   93 static __inline int
   94 ieee80211_hdrsize(const void *data)
   95 {
   96         const struct ieee80211_frame *wh = data;
   97         int size = sizeof(struct ieee80211_frame);
   98 
   99         /* NB: we don't handle control frames */
  100         KASSERT((wh->i_fc[0]&IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL,
  101                 ("%s: control frame", __func__));
  102         if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS)
  103                 size += IEEE80211_ADDR_LEN;
  104         if (IEEE80211_QOS_HAS_SEQ(wh))
  105                 size += sizeof(u_int16_t);
  106         return size;
  107 }
  108 
  109 /*
  110  * Return the size of the 802.11 header; handles any type of frame.
  111  */
  112 static __inline int
  113 ieee80211_anyhdrsize(const void *data)
  114 {
  115         const struct ieee80211_frame *wh = data;
  116 
  117         if ((wh->i_fc[0]&IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_CTL) {
  118                 switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) {
  119                 case IEEE80211_FC0_SUBTYPE_CTS:
  120                 case IEEE80211_FC0_SUBTYPE_ACK:
  121                         return sizeof(struct ieee80211_frame_ack);
  122                 }
  123                 return sizeof(struct ieee80211_frame_min);
  124         } else
  125                 return ieee80211_hdrsize(data);
  126 }
  127 
  128 /*
  129  * Template for an in-kernel authenticator.  Authenticators
  130  * register with the protocol code and are typically loaded
  131  * as separate modules as needed.
  132  */
  133 struct ieee80211_authenticator {
  134         const char *ia_name;            /* printable name */
  135         int     (*ia_attach)(struct ieee80211com *);
  136         void    (*ia_detach)(struct ieee80211com *);
  137         void    (*ia_node_join)(struct ieee80211com *,
  138                                 struct ieee80211_node *);
  139         void    (*ia_node_leave)(struct ieee80211com *,
  140                                 struct ieee80211_node *);
  141 };
  142 void    ieee80211_authenticator_register(int type,
  143                 const struct ieee80211_authenticator *);
  144 void    ieee80211_authenticator_unregister(int type);
  145 const struct ieee80211_authenticator *ieee80211_authenticator_get(int auth);
  146 
  147 struct ieee80211req;
  148 /*
  149  * Template for an MAC ACL policy module.  Such modules
  150  * register with the protocol code and are passed the sender's
  151  * address of each received frame for validation.
  152  */
  153 struct ieee80211_aclator {
  154         const char *iac_name;           /* printable name */
  155         int     (*iac_attach)(struct ieee80211com *);
  156         void    (*iac_detach)(struct ieee80211com *);
  157         int     (*iac_check)(struct ieee80211com *,
  158                         const u_int8_t mac[IEEE80211_ADDR_LEN]);
  159         int     (*iac_add)(struct ieee80211com *,
  160                         const u_int8_t mac[IEEE80211_ADDR_LEN]);
  161         int     (*iac_remove)(struct ieee80211com *,
  162                         const u_int8_t mac[IEEE80211_ADDR_LEN]);
  163         int     (*iac_flush)(struct ieee80211com *);
  164         int     (*iac_setpolicy)(struct ieee80211com *, int);
  165         int     (*iac_getpolicy)(struct ieee80211com *);
  166         int     (*iac_setioctl)(struct ieee80211com *, struct ieee80211req *);
  167         int     (*iac_getioctl)(struct ieee80211com *, struct ieee80211req *);
  168 };
  169 void    ieee80211_aclator_register(const struct ieee80211_aclator *);
  170 void    ieee80211_aclator_unregister(const struct ieee80211_aclator *);
  171 const struct ieee80211_aclator *ieee80211_aclator_get(const char *name);
  172 
  173 /* flags for ieee80211_fix_rate() */
  174 #define IEEE80211_F_DOSORT      0x00000001      /* sort rate list */
  175 #define IEEE80211_F_DOFRATE     0x00000002      /* use fixed rate */
  176 #define IEEE80211_F_DONEGO      0x00000004      /* calc negotiated rate */
  177 #define IEEE80211_F_DODEL       0x00000008      /* delete ignore rate */
  178 #define IEEE80211_F_JOIN        0x00000010      /* sta joining our bss */
  179 int     ieee80211_fix_rate(struct ieee80211_node *, int);
  180 
  181 /*
  182  * WME/WMM support.
  183  */
  184 struct wmeParams {
  185         u_int8_t        wmep_acm;
  186         u_int8_t        wmep_aifsn;
  187         u_int8_t        wmep_logcwmin;          /* log2(cwmin) */
  188         u_int8_t        wmep_logcwmax;          /* log2(cwmax) */
  189         u_int8_t        wmep_txopLimit;
  190         u_int8_t        wmep_noackPolicy;       /* 0 (ack), 1 (no ack) */
  191 };
  192 #define IEEE80211_TXOP_TO_US(_txop)     ((_txop)<<5)
  193 #define IEEE80211_US_TO_TXOP(_us)       ((_us)>>5)
  194 
  195 struct chanAccParams {
  196         u_int8_t        cap_info;               /* version of the current set */
  197         struct wmeParams cap_wmeParams[WME_NUM_AC];
  198 };
  199 
  200 struct ieee80211_wme_state {
  201         u_int   wme_flags;
  202 #define WME_F_AGGRMODE  0x00000001      /* STATUS: WME agressive mode */
  203         u_int   wme_hipri_traffic;      /* VI/VO frames in beacon interval */
  204         u_int   wme_hipri_switch_thresh;/* agressive mode switch thresh */
  205         u_int   wme_hipri_switch_hysteresis;/* agressive mode switch hysteresis */
  206 
  207         struct wmeParams wme_params[4];         /* from assoc resp for each AC*/
  208         struct chanAccParams wme_wmeChanParams; /* WME params applied to self */
  209         struct chanAccParams wme_wmeBssChanParams;/* WME params bcast to stations */
  210         struct chanAccParams wme_chanParams;    /* params applied to self */
  211         struct chanAccParams wme_bssChanParams; /* params bcast to stations */
  212 
  213         int     (*wme_update)(struct ieee80211com *);
  214 };
  215 
  216 void    ieee80211_wme_initparams(struct ieee80211com *);
  217 void    ieee80211_wme_updateparams(struct ieee80211com *);
  218 void    ieee80211_wme_updateparams_locked(struct ieee80211com *);
  219 
  220 #define ieee80211_new_state(_ic, _nstate, _arg) \
  221         (((_ic)->ic_newstate)((_ic), (_nstate), (_arg)))
  222 void    ieee80211_beacon_miss(struct ieee80211com *);
  223 void    ieee80211_print_essid(const u_int8_t *, int);
  224 void    ieee80211_dump_pkt(const u_int8_t *, int, int, int);
  225 
  226 extern  const char *ieee80211_state_name[IEEE80211_S_MAX];
  227 extern  const char *ieee80211_wme_acnames[];
  228 
  229 /*
  230  * Beacon frames constructed by ieee80211_beacon_alloc
  231  * have the following structure filled in so drivers
  232  * can update the frame later w/ minimal overhead.
  233  */
  234 struct ieee80211_beacon_offsets {
  235         u_int16_t       *bo_caps;       /* capabilities */
  236         u_int8_t        *bo_tim;        /* start of atim/dtim */
  237         u_int8_t        *bo_wme;        /* start of WME parameters */
  238         u_int8_t        *bo_trailer;    /* start of fixed-size trailer */
  239         u_int16_t       bo_tim_len;     /* atim/dtim length in bytes */
  240         u_int16_t       bo_trailer_len; /* trailer length in bytes */
  241         u_int8_t        *bo_erp;        /* start of ERP element */
  242         void            *bo_pad[8];     /* future expansion */
  243 };
  244 struct mbuf *ieee80211_beacon_alloc(struct ieee80211com *,
  245                 struct ieee80211_node *, struct ieee80211_beacon_offsets *);
  246 int     ieee80211_beacon_update(struct ieee80211com *,
  247                 struct ieee80211_node *, struct ieee80211_beacon_offsets *,
  248                 struct mbuf *, int broadcast);
  249 
  250 /*
  251  * Notification methods called from the 802.11 state machine.
  252  * Note that while these are defined here, their implementation
  253  * is OS-specific.
  254  */
  255 void    ieee80211_notify_node_join(struct ieee80211com *,
  256                 struct ieee80211_node *, int newassoc);
  257 void    ieee80211_notify_node_leave(struct ieee80211com *,
  258                 struct ieee80211_node *);
  259 void    ieee80211_notify_scan_done(struct ieee80211com *);
  260 #endif /* _NET80211_IEEE80211_PROTO_H_ */

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