include/net/irda/irlmp.h

   1 /*********************************************************************
   2  *
   3  * Filename:      irlmp.h
   4  * Version:       0.9
   5  * Description:   IrDA Link Management Protocol (LMP) layer
   6  * Status:        Experimental.
   7  * Author:        Dag Brattli <dagb@cs.uit.no>
   8  * Created at:    Sun Aug 17 20:54:32 1997
   9  * Modified at:   Fri Dec 10 13:23:01 1999
  10  * Modified by:   Dag Brattli <dagb@cs.uit.no>
  11  *
  12  *     Copyright (c) 1998-1999 Dag Brattli <dagb@cs.uit.no>,
  13  *     All Rights Reserved.
  14  *     Copyright (c) 2000-2002 Jean Tourrilhes <jt@hpl.hp.com>
  15  *
  16  *     This program is free software; you can redistribute it and/or
  17  *     modify it under the terms of the GNU General Public License as
  18  *     published by the Free Software Foundation; either version 2 of
  19  *     the License, or (at your option) any later version.
  20  *
  21  *     Neither Dag Brattli nor University of Tromsø admit liability nor
  22  *     provide warranty for any of this software. This material is
  23  *     provided "AS-IS" and at no charge.
  24  *
  25  ********************************************************************/
  26
  27 #ifndef IRLMP_H
  28 #define IRLMP_H
  29
  30 #include <asm/param.h>  /* for HZ */
  31
  32 #include <linux/types.h>
  33
  34 #include <net/irda/irda.h>
  35 #include <net/irda/qos.h>
  36 #include <net/irda/irlap.h>             /* LAP_MAX_HEADER, ... */
  37 #include <net/irda/irlmp_event.h>
  38 #include <net/irda/irqueue.h>
  39 #include <net/irda/discovery.h>
  40
  41 /* LSAP-SEL's */
  42 #define LSAP_MASK     0x7f
  43 #define LSAP_IAS      0x00
  44 #define LSAP_ANY      0xff
  45 #define LSAP_MAX      0x6f /* 0x70-0x7f are reserved */
  46 #define LSAP_CONNLESS 0x70 /* Connectionless LSAP, mostly used for Ultra */
  47
  48 #define DEV_ADDR_ANY  0xffffffff
  49
  50 #define LMP_HEADER          2    /* Dest LSAP + Source LSAP */
  51 #define LMP_CONTROL_HEADER  4    /* LMP_HEADER + opcode + parameter */
  52 #define LMP_PID_HEADER      1    /* Used by Ultra */
  53 #define LMP_MAX_HEADER      (LMP_CONTROL_HEADER+LAP_MAX_HEADER)
  54
  55 #define LM_MAX_CONNECTIONS  10
  56
  57 #define LM_IDLE_TIMEOUT     2*HZ /* 2 seconds for now */
  58
  59 typedef enum {
  60         S_PNP = 0,
  61         S_PDA,
  62         S_COMPUTER,
  63         S_PRINTER,
  64         S_MODEM,
  65         S_FAX,
  66         S_LAN,
  67         S_TELEPHONY,
  68         S_COMM,
  69         S_OBEX,
  70         S_ANY,
  71         S_END,
  72 } SERVICE;
  73
  74 /* For selective discovery */
  75 typedef void (*DISCOVERY_CALLBACK1) (discinfo_t *, DISCOVERY_MODE, void *);
  76 /* For expiry (the same) */
  77 typedef void (*DISCOVERY_CALLBACK2) (discinfo_t *, DISCOVERY_MODE, void *);
  78
  79 typedef struct {
  80         irda_queue_t queue; /* Must be first */
  81
  82         __u16_host_order hints; /* Hint bits */
  83 } irlmp_service_t;
  84
  85 typedef struct {
  86         irda_queue_t queue; /* Must be first */
  87
  88         __u16_host_order hint_mask;
  89
  90         DISCOVERY_CALLBACK1 disco_callback;     /* Selective discovery */
  91         DISCOVERY_CALLBACK2 expir_callback;     /* Selective expiration */
  92         void *priv;                /* Used to identify client */
  93 } irlmp_client_t;
  94
  95 /*
  96  *  Information about each logical LSAP connection
  97  */
  98 struct lsap_cb {
  99         irda_queue_t queue;      /* Must be first */
 100         magic_t magic;
 101
 102         unsigned long connected;        /* set_bit used on this */
 103         int  persistent;
 104
 105         __u8 slsap_sel;   /* Source (this) LSAP address */
 106         __u8 dlsap_sel;   /* Destination LSAP address (if connected) */
 107 #ifdef CONFIG_IRDA_ULTRA
 108         __u8 pid;         /* Used by connectionless LSAP */
 109 #endif /* CONFIG_IRDA_ULTRA */
 110         struct sk_buff *conn_skb; /* Store skb here while connecting */
 111
 112         struct timer_list watchdog_timer;
 113
 114         LSAP_STATE      lsap_state;  /* Connection state */
 115         notify_t        notify;      /* Indication/Confirm entry points */
 116         struct qos_info qos;         /* QoS for this connection */
 117
 118         struct lap_cb *lap; /* Pointer to LAP connection structure */
 119 };
 120
 121 /*
 122  *  Used for caching the last slsap->dlsap->handle mapping
 123  *
 124  * We don't need to keep/match the remote address in the cache because
 125  * we are associated with a specific LAP (which implies it).
 126  * Jean II
 127  */
 128 typedef struct {
 129         int valid;
 130
 131         __u8 slsap_sel;
 132         __u8 dlsap_sel;
 133         struct lsap_cb *lsap;
 134 } CACHE_ENTRY;
 135
 136 /*
 137  *  Information about each registred IrLAP layer
 138  */
 139 struct lap_cb {
 140         irda_queue_t queue; /* Must be first */
 141         magic_t magic;
 142
 143         int reason;    /* LAP disconnect reason */
 144
 145         IRLMP_STATE lap_state;
 146
 147         struct irlap_cb *irlap;   /* Instance of IrLAP layer */
 148         hashbin_t *lsaps;         /* LSAP associated with this link */
 149         struct lsap_cb *flow_next;      /* Next lsap to be polled for Tx */
 150
 151         __u8  caddr;  /* Connection address */
 152         __u32 saddr;  /* Source device address */
 153         __u32 daddr;  /* Destination device address */
 154
 155         struct qos_info *qos;  /* LAP QoS for this session */
 156         struct timer_list idle_timer;
 157
 158 #ifdef CONFIG_IRDA_CACHE_LAST_LSAP
 159         /* The lsap cache was moved from struct irlmp_cb to here because
 160          * it must be associated with the specific LAP. Also, this
 161          * improves performance. - Jean II */
 162         CACHE_ENTRY cache;  /* Caching last slsap->dlsap->handle mapping */
 163 #endif
 164 };
 165
 166 /*
 167  *  Main structure for IrLMP
 168  */
 169 struct irlmp_cb {
 170         magic_t magic;
 171
 172         __u8 conflict_flag;
 173
 174         discovery_t discovery_cmd; /* Discovery command to use by IrLAP */
 175         discovery_t discovery_rsp; /* Discovery response to use by IrLAP */
 176
 177         /* Last lsap picked automatically by irlmp_find_free_slsap() */
 178         int     last_lsap_sel;
 179
 180         struct timer_list discovery_timer;
 181
 182         hashbin_t *links;         /* IrLAP connection table */
 183         hashbin_t *unconnected_lsaps;
 184         hashbin_t *clients;
 185         hashbin_t *services;
 186
 187         hashbin_t *cachelog;    /* Current discovery log */
 188
 189         int running;
 190
 191         __u16_host_order hints; /* Hint bits */
 192 };
 193
 194 /* Prototype declarations */
 195 int  irlmp_init(void);
 196 void irlmp_cleanup(void);
 197 struct lsap_cb *irlmp_open_lsap(__u8 slsap, notify_t *notify, __u8 pid);
 198 void irlmp_close_lsap( struct lsap_cb *self);
 199
 200 __u16 irlmp_service_to_hint(int service);
 201 void *irlmp_register_service(__u16 hints);
 202 int irlmp_unregister_service(void *handle);
 203 void *irlmp_register_client(__u16 hint_mask, DISCOVERY_CALLBACK1 disco_clb,
 204                             DISCOVERY_CALLBACK2 expir_clb, void *priv);
 205 int irlmp_unregister_client(void *handle);
 206 int irlmp_update_client(void *handle, __u16 hint_mask,
 207                         DISCOVERY_CALLBACK1 disco_clb,
 208                         DISCOVERY_CALLBACK2 expir_clb, void *priv);
 209
 210 void irlmp_register_link(struct irlap_cb *, __u32 saddr, notify_t *);
 211 void irlmp_unregister_link(__u32 saddr);
 212
 213 int  irlmp_connect_request(struct lsap_cb *, __u8 dlsap_sel,
 214                            __u32 saddr, __u32 daddr,
 215                            struct qos_info *, struct sk_buff *);
 216 void irlmp_connect_indication(struct lsap_cb *self, struct sk_buff *skb);
 217 int  irlmp_connect_response(struct lsap_cb *, struct sk_buff *);
 218 void irlmp_connect_confirm(struct lsap_cb *, struct sk_buff *);
 219 struct lsap_cb *irlmp_dup(struct lsap_cb *self, void *instance);
 220
 221 void irlmp_disconnect_indication(struct lsap_cb *self, LM_REASON reason,
 222                                  struct sk_buff *userdata);
 223 int  irlmp_disconnect_request(struct lsap_cb *, struct sk_buff *userdata);
 224
 225 void irlmp_discovery_confirm(hashbin_t *discovery_log, DISCOVERY_MODE mode);
 226 void irlmp_discovery_request(int nslots);
 227 discinfo_t *irlmp_get_discoveries(int *pn, __u16 mask, int nslots);
 228 void irlmp_do_expiry(void);
 229 void irlmp_do_discovery(int nslots);
 230 discovery_t *irlmp_get_discovery_response(void);
 231 void irlmp_discovery_expiry(discinfo_t *expiry, int number);
 232
 233 int  irlmp_data_request(struct lsap_cb *, struct sk_buff *);
 234 void irlmp_data_indication(struct lsap_cb *, struct sk_buff *);
 235
 236 int  irlmp_udata_request(struct lsap_cb *, struct sk_buff *);
 237 void irlmp_udata_indication(struct lsap_cb *, struct sk_buff *);
 238
 239 #ifdef CONFIG_IRDA_ULTRA
 240 int  irlmp_connless_data_request(struct lsap_cb *, struct sk_buff *, __u8);
 241 void irlmp_connless_data_indication(struct lsap_cb *, struct sk_buff *);
 242 #endif /* CONFIG_IRDA_ULTRA */
 243
 244 void irlmp_status_indication(struct lap_cb *, LINK_STATUS link, LOCK_STATUS lock);
 245 void irlmp_flow_indication(struct lap_cb *self, LOCAL_FLOW flow);
 246
 247 LM_REASON irlmp_convert_lap_reason(LAP_REASON);
 248
 249 static inline __u32 irlmp_get_saddr(const struct lsap_cb *self)
 250 {
 251         return (self && self->lap) ? self->lap->saddr : 0;
 252 }
 253
 254 static inline __u32 irlmp_get_daddr(const struct lsap_cb *self)
 255 {
 256         return (self && self->lap) ? self->lap->daddr : 0;
 257 }
 258
 259 extern const char *irlmp_reasons[];
 260 extern int sysctl_discovery_timeout;
 261 extern int sysctl_discovery_slots;
 262 extern int sysctl_discovery;
 263 extern int sysctl_lap_keepalive_time;   /* in ms, default is LM_IDLE_TIMEOUT */
 264 extern struct irlmp_cb *irlmp;
 265
 266 /* Check if LAP queue is full.
 267  * Used by IrTTP for low control, see comments in irlap.h - Jean II */
 268 static inline int irlmp_lap_tx_queue_full(struct lsap_cb *self)
 269 {
 270         if (self == NULL)
 271                 return 0;
 272         if (self->lap == NULL)
 273                 return 0;
 274         if (self->lap->irlap == NULL)
 275                 return 0;
 276
 277         return IRLAP_GET_TX_QUEUE_LEN(self->lap->irlap) >= LAP_HIGH_THRESHOLD;
 278 }
 279
 280 /* After doing a irlmp_dup(), this get one of the two socket back into
 281  * a state where it's waiting incomming connections.
 282  * Note : this can be used *only* if the socket is not yet connected
 283  * (i.e. NO irlmp_connect_response() done on this socket).
 284  * - Jean II */
 285 static inline void irlmp_listen(struct lsap_cb *self)
 286 {
 287         self->dlsap_sel = LSAP_ANY;
 288         self->lap = NULL;
 289         self->lsap_state = LSAP_DISCONNECTED;
 290         /* Started when we received the LM_CONNECT_INDICATION */
 291         del_timer(&self->watchdog_timer);
 292 }
 293
 294 #endif