irnet_irda.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:54k
- /*
- * IrNET protocol module : Synchronous PPP over an IrDA socket.
- *
- * Jean II - HPL `00 - <jt@hpl.hp.com>
- *
- * This file implement the IRDA interface of IrNET.
- * Basically, we sit on top of IrTTP. We set up IrTTP, IrIAS properly,
- * and exchange frames with IrTTP.
- */
- #include "irnet_irda.h" /* Private header */
- /************************* CONTROL CHANNEL *************************/
- /*
- * When ppp is not active, /dev/irnet act as a control channel.
- * Writting allow to set up the IrDA destination of the IrNET channel,
- * and any application may be read events happening on IrNET...
- */
- /*------------------------------------------------------------------*/
- /*
- * Post an event to the control channel...
- * Put the event in the log, and then wait all process blocked on read
- * so they can read the log...
- */
- static void
- irnet_post_event(irnet_socket * ap,
- irnet_event event,
- __u32 saddr,
- __u32 daddr,
- char * name)
- {
- unsigned long flags; /* For spinlock */
- int index; /* In the log */
- DENTER(CTRL_TRACE, "(ap=0x%X, event=%d, daddr=%08x, name=``%s'')n",
- (unsigned int) ap, event, daddr, name);
- /* Protect this section via spinlock.
- * Note : as we are the only event producer, we only need to exclude
- * ourself when touching the log, which is nice and easy.
- */
- spin_lock_irqsave(&irnet_events.spinlock, flags);
- /* Copy the event in the log */
- index = irnet_events.index;
- irnet_events.log[index].event = event;
- irnet_events.log[index].daddr = daddr;
- irnet_events.log[index].saddr = saddr;
- /* Try to copy IrDA nickname */
- if(name)
- strcpy(irnet_events.log[index].name, name);
- else
- irnet_events.log[index].name[0] = ' ';
- /* Try to get ppp unit number */
- if((ap != (irnet_socket *) NULL) && (ap->ppp_open))
- irnet_events.log[index].unit = ppp_unit_number(&ap->chan);
- else
- irnet_events.log[index].unit = -1;
- /* Increment the index
- * Note that we increment the index only after the event is written,
- * to make sure that the readers don't get garbage... */
- irnet_events.index = (index + 1) % IRNET_MAX_EVENTS;
- DEBUG(CTRL_INFO, "New event index is %dn", irnet_events.index);
- /* Spin lock end */
- spin_unlock_irqrestore(&irnet_events.spinlock, flags);
- /* Now : wake up everybody waiting for events... */
- wake_up_interruptible_all(&irnet_events.rwait);
- DEXIT(CTRL_TRACE, "n");
- }
- /************************* IRDA SUBROUTINES *************************/
- /*
- * These are a bunch of subroutines called from other functions
- * down there, mostly common code or to improve readability...
- *
- * Note : we duplicate quite heavily some routines of af_irda.c,
- * because our input structure (self) is quite different
- * (struct irnet instead of struct irda_sock), which make sharing
- * the same code impossible (at least, without templates).
- */
- /*------------------------------------------------------------------*/
- /*
- * Function irda_open_tsap (self)
- *
- * Open local Transport Service Access Point (TSAP)
- *
- * Create a IrTTP instance for us and set all the IrTTP callbacks.
- */
- static inline int
- irnet_open_tsap(irnet_socket * self)
- {
- notify_t notify; /* Callback structure */
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- DABORT(self->tsap != NULL, -EBUSY, IRDA_SR_ERROR, "Already busy !n");
- /* Initialize IrTTP callbacks to be used by the IrDA stack */
- irda_notify_init(¬ify);
- notify.connect_confirm = irnet_connect_confirm;
- notify.connect_indication = irnet_connect_indication;
- notify.disconnect_indication = irnet_disconnect_indication;
- notify.data_indication = irnet_data_indication;
- /*notify.udata_indication = NULL;*/
- notify.flow_indication = irnet_flow_indication;
- notify.status_indication = irnet_status_indication;
- notify.instance = self;
- strncpy(notify.name, IRNET_NOTIFY_NAME, NOTIFY_MAX_NAME);
- /* Open an IrTTP instance */
- self->tsap = irttp_open_tsap(LSAP_ANY, DEFAULT_INITIAL_CREDIT,
- ¬ify);
- DABORT(self->tsap == NULL, -ENOMEM,
- IRDA_SR_ERROR, "Unable to allocate TSAP !n");
- /* Remember which TSAP selector we actually got */
- self->stsap_sel = self->tsap->stsap_sel;
- DEXIT(IRDA_SR_TRACE, " - tsap=0x%X, sel=0x%Xn",
- (unsigned int) self->tsap, self->stsap_sel);
- return 0;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_ias_to_tsap (self, result, value)
- *
- * Examine an IAS object and extract TSAP
- *
- * We do an IAP query to find the TSAP associated with the IrNET service.
- * When IrIAP pass us the result of the query, this function look at
- * the return values to check for failures and extract the TSAP if
- * possible.
- * Also deallocate value
- * The failure is in self->errno
- * Return TSAP or -1
- */
- static inline __u8
- irnet_ias_to_tsap(irnet_socket * self,
- int result,
- struct ias_value * value)
- {
- __u8 dtsap_sel = 0; /* TSAP we are looking for */
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* By default, no error */
- self->errno = 0;
- /* Check if request succeeded */
- switch(result)
- {
- /* Standard errors : service not available */
- case IAS_CLASS_UNKNOWN:
- case IAS_ATTRIB_UNKNOWN:
- DEBUG(IRDA_SR_INFO, "IAS object doesn't exist ! (%d)n", result);
- self->errno = -EADDRNOTAVAIL;
- break;
- /* Other errors, most likely IrDA stack failure */
- default :
- DEBUG(IRDA_SR_INFO, "IAS query failed ! (%d)n", result);
- self->errno = -EHOSTUNREACH;
- break;
- /* Success : we got what we wanted */
- case IAS_SUCCESS:
- break;
- }
- /* Check what was returned to us */
- if(value != NULL)
- {
- /* What type of argument have we got ? */
- switch(value->type)
- {
- case IAS_INTEGER:
- DEBUG(IRDA_SR_INFO, "result=%dn", value->t.integer);
- if(value->t.integer != -1)
- /* Get the remote TSAP selector */
- dtsap_sel = value->t.integer;
- else
- self->errno = -EADDRNOTAVAIL;
- break;
- default:
- self->errno = -EADDRNOTAVAIL;
- DERROR(IRDA_SR_ERROR, "bad type ! (0x%X)n", value->type);
- break;
- }
- /* Cleanup */
- irias_delete_value(value);
- }
- else /* value == NULL */
- {
- /* Nothing returned to us - usually result != SUCCESS */
- if(!(self->errno))
- {
- DERROR(IRDA_SR_ERROR,
- "IrDA bug : result == SUCCESS && value == NULLn");
- self->errno = -EHOSTUNREACH;
- }
- }
- DEXIT(IRDA_SR_TRACE, "n");
- /* Return the TSAP */
- return(dtsap_sel);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_find_lsap_sel (self)
- *
- * Try to lookup LSAP selector in remote LM-IAS
- *
- * Basically, we start a IAP query, and then go to sleep. When the query
- * return, irnet_getvalue_confirm will wake us up, and we can examine the
- * result of the query...
- * Note that in some case, the query fail even before we go to sleep,
- * creating some races...
- */
- static inline int
- irnet_find_lsap_sel(irnet_socket * self)
- {
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* This should not happen */
- DABORT(self->iriap, -EBUSY, IRDA_SR_ERROR, "busy with a previous query.n");
- /* Create an IAP instance, will be closed in irnet_getvalue_confirm() */
- self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
- irnet_getvalue_confirm);
- /* Treat unexpected signals as disconnect */
- self->errno = -EHOSTUNREACH;
- /* Query remote LM-IAS */
- iriap_getvaluebyclass_request(self->iriap, self->rsaddr, self->daddr,
- IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
- /* The above request is non-blocking.
- * After a while, IrDA will call us back in irnet_getvalue_confirm()
- * We will then call irnet_ias_to_tsap() and finish the
- * connection procedure */
- DEXIT(IRDA_SR_TRACE, "n");
- return 0;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_connect_tsap (self)
- *
- * Initialise the TTP socket and initiate TTP connection
- *
- */
- static inline int
- irnet_connect_tsap(irnet_socket * self)
- {
- int err;
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Open a local TSAP (an IrTTP instance) */
- err = irnet_open_tsap(self);
- if(err != 0)
- {
- clear_bit(0, &self->ttp_connect);
- DERROR(IRDA_SR_ERROR, "connect aborted!n");
- return(err);
- }
- /* Connect to remote device */
- err = irttp_connect_request(self->tsap, self->dtsap_sel,
- self->rsaddr, self->daddr, NULL,
- self->max_sdu_size_rx, NULL);
- if(err != 0)
- {
- clear_bit(0, &self->ttp_connect);
- DERROR(IRDA_SR_ERROR, "connect aborted!n");
- return(err);
- }
- /* The above call is non-blocking.
- * After a while, the IrDA stack will either call us back in
- * irnet_connect_confirm() or irnet_disconnect_indication()
- * See you there ;-) */
- DEXIT(IRDA_SR_TRACE, "n");
- return(err);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_discover_next_daddr (self)
- *
- * Query the IrNET TSAP of the next device in the log.
- *
- * Used in the TSAP discovery procedure.
- */
- static inline int
- irnet_discover_next_daddr(irnet_socket * self)
- {
- /* Close the last instance of IrIAP, and open a new one.
- * We can't reuse the IrIAP instance in the IrIAP callback */
- if(self->iriap)
- {
- iriap_close(self->iriap);
- self->iriap = NULL;
- }
- /* Create a new IAP instance */
- self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
- irnet_discovervalue_confirm);
- /* Next discovery - before the call to avoid races */
- self->disco_index++;
- /* Check if we have one more address to try */
- if(self->disco_index < self->disco_number)
- {
- /* Query remote LM-IAS */
- iriap_getvaluebyclass_request(self->iriap,
- self->discoveries[self->disco_index].saddr,
- self->discoveries[self->disco_index].daddr,
- IRNET_SERVICE_NAME, IRNET_IAS_VALUE);
- /* The above request is non-blocking.
- * After a while, IrDA will call us back in irnet_discovervalue_confirm()
- * We will then call irnet_ias_to_tsap() and come back here again... */
- return(0);
- }
- else
- return(1);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_discover_daddr_and_lsap_sel (self)
- *
- * This try to find a device with the requested service.
- *
- * Initiate a TSAP discovery procedure.
- * It basically look into the discovery log. For each address in the list,
- * it queries the LM-IAS of the device to find if this device offer
- * the requested service.
- * If there is more than one node supporting the service, we complain
- * to the user (it should move devices around).
- * If we find one node which have the requested TSAP, we connect to it.
- *
- * This function just start the whole procedure. It request the discovery
- * log and submit the first IAS query.
- * The bulk of the job is handled in irnet_discovervalue_confirm()
- *
- * Note : this procedure fails if there is more than one device in range
- * on the same dongle, because IrLMP doesn't disconnect the LAP when the
- * last LSAP is closed. Moreover, we would need to wait the LAP
- * disconnection...
- */
- static inline int
- irnet_discover_daddr_and_lsap_sel(irnet_socket * self)
- {
- int ret;
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Ask lmp for the current discovery log */
- self->discoveries = irlmp_get_discoveries(&self->disco_number, self->mask,
- DISCOVERY_DEFAULT_SLOTS);
- /* Check if the we got some results */
- if(self->discoveries == NULL)
- {
- self->disco_number = -1;
- clear_bit(0, &self->ttp_connect);
- DRETURN(-ENETUNREACH, IRDA_SR_INFO, "No Cachelog...n");
- }
- DEBUG(IRDA_SR_INFO, "Got the log (0x%X), size is %dn",
- (unsigned int) self->discoveries, self->disco_number);
- /* Start with the first discovery */
- self->disco_index = -1;
- self->daddr = DEV_ADDR_ANY;
- /* This will fail if the log is empty - this is non-blocking */
- ret = irnet_discover_next_daddr(self);
- if(ret)
- {
- /* Close IAP */
- iriap_close(self->iriap);
- self->iriap = NULL;
- /* Cleanup our copy of the discovery log */
- kfree(self->discoveries);
- self->discoveries = NULL;
- clear_bit(0, &self->ttp_connect);
- DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...n");
- }
- /* Follow me in irnet_discovervalue_confirm() */
- DEXIT(IRDA_SR_TRACE, "n");
- return(0);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_dname_to_daddr (self)
- *
- * Convert an IrDA nickname to a valid IrDA address
- *
- * It basically look into the discovery log until there is a match.
- */
- static inline int
- irnet_dname_to_daddr(irnet_socket * self)
- {
- struct irda_device_info *discoveries; /* Copy of the discovery log */
- int number; /* Number of nodes in the log */
- int i;
- DENTER(IRDA_SR_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Ask lmp for the current discovery log */
- discoveries = irlmp_get_discoveries(&number, 0xffff,
- DISCOVERY_DEFAULT_SLOTS);
- /* Check if the we got some results */
- if(discoveries == NULL)
- DRETURN(-ENETUNREACH, IRDA_SR_INFO, "Cachelog empty...n");
- /*
- * Now, check all discovered devices (if any), and connect
- * client only about the services that the client is
- * interested in...
- */
- for(i = 0; i < number; i++)
- {
- /* Does the name match ? */
- if(!strncmp(discoveries[i].info, self->rname, NICKNAME_MAX_LEN))
- {
- /* Yes !!! Get it.. */
- self->daddr = discoveries[i].daddr;
- DEBUG(IRDA_SR_INFO, "discovered device ``%s'' at address 0x%08x.n",
- self->rname, self->daddr);
- kfree(discoveries);
- DEXIT(IRDA_SR_TRACE, "n");
- return 0;
- }
- }
- /* No luck ! */
- DEBUG(IRDA_SR_INFO, "cannot discover device ``%s'' !!!n", self->rname);
- kfree(discoveries);
- return(-EADDRNOTAVAIL);
- }
- /************************* SOCKET ROUTINES *************************/
- /*
- * This are the main operations on IrNET sockets, basically to create
- * and destroy IrNET sockets. These are called from the PPP part...
- */
- /*------------------------------------------------------------------*/
- /*
- * Create a IrNET instance : just initialise some parameters...
- */
- int
- irda_irnet_create(irnet_socket * self)
- {
- DENTER(IRDA_SOCK_TRACE, "(self=0x%X)n", (unsigned int) self);
- self->magic = IRNET_MAGIC; /* Paranoia */
- self->ttp_open = 0; /* Prevent higher layer from accessing IrTTP */
- self->ttp_connect = 0; /* Not connecting yet */
- self->rname[0] = ' '; /* May be set via control channel */
- self->rdaddr = DEV_ADDR_ANY; /* May be set via control channel */
- self->rsaddr = DEV_ADDR_ANY; /* May be set via control channel */
- self->daddr = DEV_ADDR_ANY; /* Until we get connected */
- self->saddr = DEV_ADDR_ANY; /* Until we get connected */
- self->max_sdu_size_rx = TTP_SAR_UNBOUND;
- /* Register as a client with IrLMP */
- self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
- #ifdef DISCOVERY_NOMASK
- self->mask = 0xffff; /* For W2k compatibility */
- #else /* DISCOVERY_NOMASK */
- self->mask = irlmp_service_to_hint(S_LAN);
- #endif /* DISCOVERY_NOMASK */
- self->tx_flow = FLOW_START; /* Flow control from IrTTP */
- DEXIT(IRDA_SOCK_TRACE, "n");
- return(0);
- }
- /*------------------------------------------------------------------*/
- /*
- * Connect to the other side :
- * o convert device name to an address
- * o find the socket number (dlsap)
- * o Establish the connection
- *
- * Note : We no longer mimic af_irda. The IAS query for finding the TSAP
- * is done asynchronously, like the TTP connection. This allow us to
- * call this function from any context (not only process).
- * The downside is that following what's happening in there is tricky
- * because it involve various functions all over the place...
- */
- int
- irda_irnet_connect(irnet_socket * self)
- {
- int err;
- DENTER(IRDA_SOCK_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Check if we are already trying to connect.
- * Because irda_irnet_connect() can be called directly by pppd plus
- * packet retries in ppp_generic and connect may take time, plus we may
- * race with irnet_connect_indication(), we need to be careful there... */
- if(test_and_set_bit(0, &self->ttp_connect))
- DRETURN(-EBUSY, IRDA_SOCK_INFO, "Already connecting...n");
- if((self->iriap != NULL) || (self->tsap != NULL))
- DERROR(IRDA_SOCK_ERROR, "Socket not cleaned up...n");
- /* Insert ourselves in the hashbin so that the IrNET server can find us.
- * Notes : 4th arg is string of 32 char max and must be null terminated
- * When 4th arg is used (string), 3rd arg isn't (int)
- * Can't re-insert (MUST remove first) so check for that... */
- if((irnet_server.running) && (self->q.q_next == NULL))
- {
- unsigned long flags;
- spin_lock_irqsave(&irnet_server.spinlock, flags);
- hashbin_insert(irnet_server.list, (irda_queue_t *) self, 0, self->rname);
- spin_unlock_irqrestore(&irnet_server.spinlock, flags);
- DEBUG(IRDA_SOCK_INFO, "Inserted ``%s'' in hashbin...n", self->rname);
- }
- /* If we don't have anything (no address, no name) */
- if((self->rdaddr == DEV_ADDR_ANY) && (self->rname[0] == ' '))
- {
- /* Try to find a suitable address */
- if((err = irnet_discover_daddr_and_lsap_sel(self)) != 0)
- DRETURN(err, IRDA_SOCK_INFO, "auto-connect failed!n");
- /* In most cases, the call above is non-blocking */
- }
- else
- {
- /* If we have only the name (no address), try to get an address */
- if(self->rdaddr == DEV_ADDR_ANY)
- {
- if((err = irnet_dname_to_daddr(self)) != 0)
- DRETURN(err, IRDA_SOCK_INFO, "name connect failed!n");
- }
- else
- /* Use the requested destination address */
- self->daddr = self->rdaddr;
- /* Query remote LM-IAS to find LSAP selector */
- irnet_find_lsap_sel(self);
- /* The above call is non blocking */
- }
- /* At this point, we are waiting for the IrDA stack to call us back,
- * or we have already failed.
- * We will finish the connection procedure in irnet_connect_tsap().
- */
- DEXIT(IRDA_SOCK_TRACE, "n");
- return(0);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_irnet_destroy(self)
- *
- * Destroy irnet instance
- *
- * Note : this need to be called from a process context.
- */
- void
- irda_irnet_destroy(irnet_socket * self)
- {
- DENTER(IRDA_SOCK_TRACE, "(self=0x%X)n", (unsigned int) self);
- if(self == NULL)
- return;
- /* Remove ourselves from hashbin (if we are queued in hashbin)
- * Note : `irnet_server.running' protect us from calls in hashbin_delete() */
- if((irnet_server.running) && (self->q.q_next != NULL))
- {
- struct irnet_socket * entry;
- unsigned long flags;
- DEBUG(IRDA_SOCK_INFO, "Removing from hash..n");
- spin_lock_irqsave(&irnet_server.spinlock, flags);
- entry = hashbin_remove_this(irnet_server.list, (irda_queue_t *) self);
- self->q.q_next = NULL;
- spin_unlock_irqrestore(&irnet_server.spinlock, flags);
- DASSERT(entry == self, , IRDA_SOCK_ERROR, "Can't remove from hash.n");
- }
- /* If we were connected, post a message */
- if(test_bit(0, &self->ttp_open))
- {
- /* Note : as the disconnect comes from ppp_generic, the unit number
- * doesn't exist anymore when we post the event, so we need to pass
- * NULL as the first arg... */
- irnet_post_event(NULL, IRNET_DISCONNECT_TO,
- self->saddr, self->daddr, self->rname);
- }
- /* Prevent various IrDA callbacks from messing up things
- * Need to be first */
- clear_bit(0, &self->ttp_connect);
- /* Prevent higher layer from accessing IrTTP */
- clear_bit(0, &self->ttp_open);
- /* Unregister with IrLMP */
- irlmp_unregister_client(self->ckey);
- /* Unregister with LM-IAS */
- if(self->iriap)
- {
- iriap_close(self->iriap);
- self->iriap = NULL;
- }
- /* Cleanup eventual discoveries from connection attempt */
- if(self->discoveries != NULL)
- {
- /* Cleanup our copy of the discovery log */
- kfree(self->discoveries);
- self->discoveries = NULL;
- }
- /* Close our IrTTP connection */
- if(self->tsap)
- {
- DEBUG(IRDA_SOCK_INFO, "Closing our TTP connection.n");
- irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
- irttp_close_tsap(self->tsap);
- self->tsap = NULL;
- }
- self->stsap_sel = 0;
- DEXIT(IRDA_SOCK_TRACE, "n");
- return;
- }
- /************************** SERVER SOCKET **************************/
- /*
- * The IrNET service is composed of one server socket and a variable
- * number of regular IrNET sockets. The server socket is supposed to
- * handle incoming connections and redirect them to one IrNET sockets.
- * It's a superset of the regular IrNET socket, but has a very distinct
- * behaviour...
- */
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_daddr_to_dname (self)
- *
- * Convert an IrDA address to a IrDA nickname
- *
- * It basically look into the discovery log until there is a match.
- */
- static inline int
- irnet_daddr_to_dname(irnet_socket * self)
- {
- struct irda_device_info *discoveries; /* Copy of the discovery log */
- int number; /* Number of nodes in the log */
- int i;
- DENTER(IRDA_SERV_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Ask lmp for the current discovery log */
- discoveries = irlmp_get_discoveries(&number, 0xffff,
- DISCOVERY_DEFAULT_SLOTS);
- /* Check if the we got some results */
- if (discoveries == NULL)
- DRETURN(-ENETUNREACH, IRDA_SERV_INFO, "Cachelog empty...n");
- /* Now, check all discovered devices (if any) */
- for(i = 0; i < number; i++)
- {
- /* Does the name match ? */
- if(discoveries[i].daddr == self->daddr)
- {
- /* Yes !!! Get it.. */
- strncpy(self->rname, discoveries[i].info, NICKNAME_MAX_LEN);
- self->rname[NICKNAME_MAX_LEN + 1] = ' ';
- DEBUG(IRDA_SERV_INFO, "Device 0x%08x is in fact ``%s''.n",
- self->daddr, self->rname);
- kfree(discoveries);
- DEXIT(IRDA_SERV_TRACE, "n");
- return 0;
- }
- }
- /* No luck ! */
- DEXIT(IRDA_SERV_INFO, ": cannot discover device 0x%08x !!!n", self->daddr);
- kfree(discoveries);
- return(-EADDRNOTAVAIL);
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_find_socket (self)
- *
- * Find the correct IrNET socket
- *
- * Look into the list of IrNET sockets and finds one with the right
- * properties...
- */
- static inline irnet_socket *
- irnet_find_socket(irnet_socket * self)
- {
- irnet_socket * new = (irnet_socket *) NULL;
- unsigned long flags;
- int err;
- DENTER(IRDA_SERV_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Get the addresses of the requester */
- self->daddr = irttp_get_daddr(self->tsap);
- self->saddr = irttp_get_saddr(self->tsap);
- /* Try to get the IrDA nickname of the requester */
- err = irnet_daddr_to_dname(self);
- /* Protect access to the instance list */
- spin_lock_irqsave(&irnet_server.spinlock, flags);
- /* So now, try to get an socket having specifically
- * requested that nickname */
- if(err == 0)
- {
- new = (irnet_socket *) hashbin_find(irnet_server.list,
- 0, self->rname);
- if(new)
- DEBUG(IRDA_SERV_INFO, "Socket 0x%X matches rname ``%s''.n",
- (unsigned int) new, new->rname);
- }
- /* If no name matches, try to find an socket by the destination address */
- /* It can be either the requested destination address (set via the
- * control channel), or the current destination address if the
- * socket is in the middle of a connection request */
- if(new == (irnet_socket *) NULL)
- {
- new = (irnet_socket *) hashbin_get_first(irnet_server.list);
- while(new !=(irnet_socket *) NULL)
- {
- /* Does it have the same address ? */
- if((new->rdaddr == self->daddr) || (new->daddr == self->daddr))
- {
- /* Yes !!! Get it.. */
- DEBUG(IRDA_SERV_INFO, "Socket 0x%X matches daddr %#08x.n",
- (unsigned int) new, self->daddr);
- break;
- }
- new = (irnet_socket *) hashbin_get_next(irnet_server.list);
- }
- }
- /* If we don't have any socket, get the first unconnected socket */
- if(new == (irnet_socket *) NULL)
- {
- new = (irnet_socket *) hashbin_get_first(irnet_server.list);
- while(new !=(irnet_socket *) NULL)
- {
- /* Is it available ? */
- if(!(test_bit(0, &new->ttp_open)) && (new->rdaddr == DEV_ADDR_ANY) &&
- (new->rname[0] == ' ') && (new->ppp_open))
- {
- /* Yes !!! Get it.. */
- DEBUG(IRDA_SERV_INFO, "Socket 0x%X is free.n",
- (unsigned int) new);
- break;
- }
- new = (irnet_socket *) hashbin_get_next(irnet_server.list);
- }
- }
- /* Spin lock end */
- spin_unlock_irqrestore(&irnet_server.spinlock, flags);
- DEXIT(IRDA_SERV_TRACE, " - new = 0x%Xn", (unsigned int) new);
- return new;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_connect_socket (self)
- *
- * Connect an incoming connection to the socket
- *
- */
- static inline int
- irnet_connect_socket(irnet_socket * server,
- irnet_socket * new,
- struct qos_info * qos,
- __u32 max_sdu_size,
- __u8 max_header_size)
- {
- DENTER(IRDA_SERV_TRACE, "(server=0x%X, new=0x%X)n",
- (unsigned int) server, (unsigned int) new);
- /* Now attach up the new socket */
- new->tsap = irttp_dup(server->tsap, new);
- DABORT(new->tsap == NULL, -1, IRDA_SERV_ERROR, "dup failed!n");
- /* Set up all the relevant parameters on the new socket */
- new->stsap_sel = new->tsap->stsap_sel;
- new->dtsap_sel = new->tsap->dtsap_sel;
- new->saddr = irttp_get_saddr(new->tsap);
- new->daddr = irttp_get_daddr(new->tsap);
- new->max_header_size = max_header_size;
- new->max_sdu_size_tx = max_sdu_size;
- new->max_data_size = max_sdu_size;
- #ifdef STREAM_COMPAT
- /* If we want to receive "stream sockets" */
- if(max_sdu_size == 0)
- new->max_data_size = irttp_get_max_seg_size(new->tsap);
- #endif /* STREAM_COMPAT */
- /* Clean up the original one to keep it in listen state */
- irttp_listen(server->tsap);
- /* Send a connection response on the new socket */
- irttp_connect_response(new->tsap, new->max_sdu_size_rx, NULL);
- /* Allow PPP to send its junk over the new socket... */
- set_bit(0, &new->ttp_open);
- /* Not connecting anymore, and clean up last possible remains
- * of connection attempts on the socket */
- clear_bit(0, &new->ttp_connect);
- if(new->iriap)
- {
- iriap_close(new->iriap);
- new->iriap = NULL;
- }
- if(new->discoveries != NULL)
- {
- kfree(new->discoveries);
- new->discoveries = NULL;
- }
- #ifdef CONNECT_INDIC_KICK
- /* As currently we don't block packets in ppp_irnet_send() while passive,
- * this is not really needed...
- * Also, not doing it give IrDA a chance to finish the setup properly
- * before beeing swamped with packets... */
- ppp_output_wakeup(&new->chan);
- #endif /* CONNECT_INDIC_KICK */
- /* Notify the control channel */
- irnet_post_event(new, IRNET_CONNECT_FROM,
- new->saddr, new->daddr, server->rname);
- DEXIT(IRDA_SERV_TRACE, "n");
- return 0;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_disconnect_server (self)
- *
- * Cleanup the server socket when the incoming connection abort
- *
- */
- static inline void
- irnet_disconnect_server(irnet_socket * self,
- struct sk_buff *skb)
- {
- DENTER(IRDA_SERV_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Put the received packet in the black hole */
- kfree_skb(skb);
- #ifdef FAIL_SEND_DISCONNECT
- /* Tell the other party we don't want to be connected */
- /* Hum... Is it the right thing to do ? And do we need to send
- * a connect response before ? It looks ok without this... */
- irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
- #endif /* FAIL_SEND_DISCONNECT */
- /* Notify the control channel (see irnet_find_socket()) */
- irnet_post_event(NULL, IRNET_REQUEST_FROM,
- self->saddr, self->daddr, self->rname);
- /* Clean up the server to keep it in listen state */
- irttp_listen(self->tsap);
- DEXIT(IRDA_SERV_TRACE, "n");
- return;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_setup_server (self)
- *
- * Create a IrTTP server and set it up...
- *
- * Register the IrLAN hint bit, create a IrTTP instance for us,
- * set all the IrTTP callbacks and create an IrIAS entry...
- */
- static inline int
- irnet_setup_server(void)
- {
- __u16 hints;
- DENTER(IRDA_SERV_TRACE, "()n");
- /* Initialise the regular socket part of the server */
- irda_irnet_create(&irnet_server.s);
- /* Open a local TSAP (an IrTTP instance) for the server */
- irnet_open_tsap(&irnet_server.s);
- /* PPP part setup */
- irnet_server.s.ppp_open = 0;
- irnet_server.s.chan.private = NULL;
- irnet_server.s.file = NULL;
- /* Get the hint bit corresponding to IrLAN */
- /* Note : we overload the IrLAN hint bit. As it is only a "hint", and as
- * we provide roughly the same functionality as IrLAN, this is ok.
- * In fact, the situation is similar as JetSend overloading the Obex hint
- */
- hints = irlmp_service_to_hint(S_LAN);
- #ifdef ADVERTISE_HINT
- /* Register with IrLMP as a service (advertise our hint bit) */
- irnet_server.skey = irlmp_register_service(hints);
- #endif /* ADVERTISE_HINT */
- /* Register with LM-IAS (so that people can connect to us) */
- irnet_server.ias_obj = irias_new_object(IRNET_SERVICE_NAME, jiffies);
- irias_add_integer_attrib(irnet_server.ias_obj, IRNET_IAS_VALUE,
- irnet_server.s.stsap_sel, IAS_KERNEL_ATTR);
- irias_insert_object(irnet_server.ias_obj);
- #ifdef DISCOVERY_EVENTS
- /* Tell IrLMP we want to be notified of newly discovered nodes */
- irlmp_update_client(irnet_server.s.ckey, hints,
- irnet_discovery_indication, irnet_expiry_indication,
- (void *) &irnet_server.s);
- #endif
- DEXIT(IRDA_SERV_TRACE, " - self=0x%Xn", (unsigned int) &irnet_server.s);
- return 0;
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irda_destroy_server (self)
- *
- * Destroy the IrTTP server...
- *
- * Reverse of the previous function...
- */
- static inline void
- irnet_destroy_server(void)
- {
- DENTER(IRDA_SERV_TRACE, "()n");
- #ifdef ADVERTISE_HINT
- /* Unregister with IrLMP */
- irlmp_unregister_service(irnet_server.skey);
- #endif /* ADVERTISE_HINT */
- /* Unregister with LM-IAS */
- if(irnet_server.ias_obj)
- irias_delete_object(irnet_server.ias_obj);
- /* Cleanup the socket part */
- irda_irnet_destroy(&irnet_server.s);
- DEXIT(IRDA_SERV_TRACE, "n");
- return;
- }
- /************************ IRDA-TTP CALLBACKS ************************/
- /*
- * When we create a IrTTP instance, we pass to it a set of callbacks
- * that IrTTP will call in case of various events.
- * We take care of those events here.
- */
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_data_indication (instance, sap, skb)
- *
- * Received some data from TinyTP. Just queue it on the receive queue
- *
- */
- static int
- irnet_data_indication(void * instance,
- void * sap,
- struct sk_buff *skb)
- {
- irnet_socket * ap = (irnet_socket *) instance;
- unsigned char * p;
- int code = 0;
- DENTER(IRDA_TCB_TRACE, "(self/ap=0x%X, skb=0x%X)n",
- (unsigned int) ap,(unsigned int) skb);
- DASSERT(skb != NULL, 0, IRDA_CB_ERROR, "skb is NULL !!!n");
- /* Check is ppp is ready to receive our packet */
- if(!ap->ppp_open)
- {
- DERROR(IRDA_CB_ERROR, "PPP not ready, dropping packet...n");
- /* When we return error, TTP will need to requeue the skb and
- * will stop the sender. IrTTP will stall until we send it a
- * flow control request... */
- return -ENOMEM;
- }
- /* strip address/control field if present */
- p = skb->data;
- if((p[0] == PPP_ALLSTATIONS) && (p[1] == PPP_UI))
- {
- /* chop off address/control */
- if(skb->len < 3)
- goto err_exit;
- p = skb_pull(skb, 2);
- }
- /* decompress protocol field if compressed */
- if(p[0] & 1)
- {
- /* protocol is compressed */
- skb_push(skb, 1)[0] = 0;
- }
- else
- if(skb->len < 2)
- goto err_exit;
- /* pass to generic ppp layer */
- /* Note : how do I know if ppp can accept or not the packet ? This is
- * essential if I want to manage flow control smoothly... */
- ppp_input(&ap->chan, skb);
- DEXIT(IRDA_TCB_TRACE, "n");
- return 0;
- err_exit:
- DERROR(IRDA_CB_ERROR, "Packet too small, dropping...n");
- kfree_skb(skb);
- ppp_input_error(&ap->chan, code);
- return 0; /* Don't return an error code, only for flow control... */
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_disconnect_indication (instance, sap, reason, skb)
- *
- * Connection has been closed. Chech reason to find out why
- *
- * Note : there are many cases where we come here :
- * o attempted to connect, timeout
- * o connected, link is broken, LAP has timeout
- * o connected, other side close the link
- * o connection request on the server no handled
- */
- static void
- irnet_disconnect_indication(void * instance,
- void * sap,
- LM_REASON reason,
- struct sk_buff *skb)
- {
- irnet_socket * self = (irnet_socket *) instance;
- int test_open;
- int test_connect;
- DENTER(IRDA_TCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!n");
- /* Don't care about it, but let's not leak it */
- if(skb)
- dev_kfree_skb(skb);
- /* Prevent higher layer from accessing IrTTP */
- test_open = test_and_clear_bit(0, &self->ttp_open);
- /* Not connecting anymore...
- * (note : TSAP is open, so IAP callbacks are no longer pending...) */
- test_connect = test_and_clear_bit(0, &self->ttp_connect);
- /* If both self->ttp_open and self->ttp_connect are NULL, it mean that we
- * have a race condition with irda_irnet_destroy() or
- * irnet_connect_indication(), so don't mess up tsap...
- */
- if(!(test_open || test_connect))
- {
- DERROR(IRDA_CB_ERROR, "Race condition detected...n");
- return;
- }
- /* If we were active, notify the control channel */
- if(test_open)
- irnet_post_event(self, IRNET_DISCONNECT_FROM,
- self->saddr, self->daddr, self->rname);
- else
- /* If we were trying to connect, notify the control channel */
- if((self->tsap) && (self != &irnet_server.s))
- irnet_post_event(self, IRNET_NOANSWER_FROM,
- self->saddr, self->daddr, self->rname);
- /* Close our IrTTP connection, cleanup tsap */
- if((self->tsap) && (self != &irnet_server.s))
- {
- DEBUG(IRDA_CB_INFO, "Closing our TTP connection.n");
- irttp_close_tsap(self->tsap);
- self->tsap = NULL;
- /* Flush (drain) ppp_generic Tx queue (most often we have blocked it) */
- if(self->ppp_open)
- ppp_output_wakeup(&self->chan);
- }
- /* Cleanup the socket in case we want to reconnect */
- self->stsap_sel = 0;
- self->daddr = DEV_ADDR_ANY;
- self->tx_flow = FLOW_START;
- /* Note : what should we say to ppp ?
- * It seem the ppp_generic and pppd are happy that way and will eventually
- * timeout gracefully, so don't bother them... */
- DEXIT(IRDA_TCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_connect_confirm (instance, sap, qos, max_sdu_size, skb)
- *
- * Connections has been confirmed by the remote device
- *
- */
- static void
- irnet_connect_confirm(void * instance,
- void * sap,
- struct qos_info *qos,
- __u32 max_sdu_size,
- __u8 max_header_size,
- struct sk_buff *skb)
- {
- irnet_socket * self = (irnet_socket *) instance;
- DENTER(IRDA_TCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- /* Check if socket is closing down (via irda_irnet_destroy()) */
- if(! test_bit(0, &self->ttp_connect))
- {
- DERROR(IRDA_CB_ERROR, "Socket no longer connecting. Ouch !n");
- return;
- }
- /* How much header space do we need to reserve */
- self->max_header_size = max_header_size;
- /* IrTTP max SDU size in transmit direction */
- self->max_sdu_size_tx = max_sdu_size;
- self->max_data_size = max_sdu_size;
- #ifdef STREAM_COMPAT
- if(max_sdu_size == 0)
- self->max_data_size = irttp_get_max_seg_size(self->tsap);
- #endif /* STREAM_COMPAT */
- /* At this point, IrLMP has assigned our source address */
- self->saddr = irttp_get_saddr(self->tsap);
- /* Allow higher layer to access IrTTP */
- set_bit(0, &self->ttp_open);
- clear_bit(0, &self->ttp_connect); /* Not racy, IrDA traffic is serial */
- /* Give a kick in the ass of ppp_generic so that he sends us some data */
- ppp_output_wakeup(&self->chan);
- /* Check size of received packet */
- if(skb->len > 0)
- {
- #ifdef PASS_CONNECT_PACKETS
- DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.n");
- /* Try to pass it to PPP */
- irnet_data_indication(instance, sap, skb);
- #else /* PASS_CONNECT_PACKETS */
- DERROR(IRDA_CB_ERROR, "Dropping non empty packet.n");
- kfree_skb(skb); /* Note : will be optimised with other kfree... */
- #endif /* PASS_CONNECT_PACKETS */
- }
- else
- kfree_skb(skb);
- /* Notify the control channel */
- irnet_post_event(self, IRNET_CONNECT_TO,
- self->saddr, self->daddr, self->rname);
- DEXIT(IRDA_TCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_flow_indication (instance, sap, flow)
- *
- * Used by TinyTP to tell us if it can accept more data or not
- *
- */
- static void
- irnet_flow_indication(void * instance,
- void * sap,
- LOCAL_FLOW flow)
- {
- irnet_socket * self = (irnet_socket *) instance;
- LOCAL_FLOW oldflow = self->tx_flow;
- DENTER(IRDA_TCB_TRACE, "(self=0x%X, flow=%d)n", (unsigned int) self, flow);
- /* Update our state */
- self->tx_flow = flow;
- /* Check what IrTTP want us to do... */
- switch(flow)
- {
- case FLOW_START:
- DEBUG(IRDA_CB_INFO, "IrTTP wants us to start againn");
- /* Check if we really need to wake up PPP */
- if(oldflow == FLOW_STOP)
- ppp_output_wakeup(&self->chan);
- else
- DEBUG(IRDA_CB_INFO, "But we were already transmitting !!!n");
- break;
- case FLOW_STOP:
- DEBUG(IRDA_CB_INFO, "IrTTP wants us to slow downn");
- break;
- default:
- DEBUG(IRDA_CB_INFO, "Unknown flow command!n");
- break;
- }
- DEXIT(IRDA_TCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_status_indication (instance, sap, reason, skb)
- *
- * Link (IrLAP) status report.
- *
- */
- static void
- irnet_status_indication(void * instance,
- LINK_STATUS link,
- LOCK_STATUS lock)
- {
- irnet_socket * self = (irnet_socket *) instance;
- DENTER(IRDA_TCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(self != NULL, , IRDA_CB_ERROR, "Self is NULL !!!n");
- /* We can only get this event if we are connected */
- switch(link)
- {
- case STATUS_NO_ACTIVITY:
- irnet_post_event(self, IRNET_BLOCKED_LINK,
- self->saddr, self->daddr, self->rname);
- break;
- default:
- DEBUG(IRDA_CB_INFO, "Unknown status...n");
- }
- DEXIT(IRDA_TCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_connect_indication(instance, sap, qos, max_sdu_size, userdata)
- *
- * Incoming connection
- *
- * In theory, this function is called only on the server socket.
- * Some other node is attempting to connect to the IrNET service, and has
- * sent a connection request on our server socket.
- * We just redirect the connection to the relevant IrNET socket.
- *
- * Note : we also make sure that between 2 irnet nodes, there can
- * exist only one irnet connection.
- */
- static void
- irnet_connect_indication(void * instance,
- void * sap,
- struct qos_info *qos,
- __u32 max_sdu_size,
- __u8 max_header_size,
- struct sk_buff *skb)
- {
- irnet_socket * server = &irnet_server.s;
- irnet_socket * new = (irnet_socket *) NULL;
- DENTER(IRDA_TCB_TRACE, "(server=0x%X)n", (unsigned int) server);
- DASSERT(instance == &irnet_server, , IRDA_CB_ERROR,
- "Invalid instance (0x%X) !!!n", (unsigned int) instance);
- DASSERT(sap == irnet_server.s.tsap, , IRDA_CB_ERROR, "Invalid sap !!!n");
- /* Try to find the most appropriate IrNET socket */
- new = irnet_find_socket(server);
- /* After all this hard work, do we have an socket ? */
- if(new == (irnet_socket *) NULL)
- {
- DEXIT(IRDA_CB_INFO, ": No socket waiting for this connection.n");
- irnet_disconnect_server(server, skb);
- return;
- }
- /* Is the socket already busy ? */
- if(test_bit(0, &new->ttp_open))
- {
- DEXIT(IRDA_CB_INFO, ": Socket already connected.n");
- irnet_disconnect_server(server, skb);
- return;
- }
- /* Socket connecting ?
- * Clear up flag : prevent irnet_disconnect_indication() to mess up tsap */
- if(test_and_clear_bit(0, &new->ttp_connect))
- {
- /* The socket is trying to connect to the other end and may have sent
- * a IrTTP connection request and is waiting for a connection response
- * (that may never come).
- * Now, the pain is that the socket may have opened a tsap and is
- * waiting on it, while the other end is trying to connect to it on
- * another tsap.
- */
- DERROR(IRDA_CB_ERROR, "Socket already connecting. Ouch !n");
- #ifdef ALLOW_SIMULT_CONNECT
- /* Cleanup the TSAP if necessary - IrIAP will be cleaned up later */
- if(new->tsap != NULL)
- {
- /* Close the connection the new socket was attempting.
- * This seems to be safe... */
- irttp_close_tsap(new->tsap);
- new->tsap = NULL;
- }
- /* Note : no return, fall through... */
- #else /* ALLOW_SIMULT_CONNECT */
- irnet_disconnect_server(server, skb);
- return;
- #endif /* ALLOW_SIMULT_CONNECT */
- }
- else
- /* If socket is not connecting or connected, tsap should be NULL */
- if(new->tsap != NULL)
- {
- /* If we are here, we are also in irnet_disconnect_indication(),
- * and it's a nice race condition... On the other hand, we can't be
- * in irda_irnet_destroy() otherwise we would not have found the
- * socket in the hashbin. */
- /* Better get out of here, otherwise we will mess up tsaps ! */
- DERROR(IRDA_CB_ERROR, "Race condition detected, abort connect...n");
- irnet_disconnect_server(server, skb);
- return;
- }
- /* So : at this point, we have a socket, and it is idle. Good ! */
- irnet_connect_socket(server, new, qos, max_sdu_size, max_header_size);
- /* Check size of received packet */
- if(skb->len > 0)
- {
- #ifdef PASS_CONNECT_PACKETS
- DEBUG(IRDA_CB_INFO, "Passing connect packet to PPP.n");
- /* Try to pass it to PPP */
- irnet_data_indication(new, new->tsap, skb);
- #else /* PASS_CONNECT_PACKETS */
- DERROR(IRDA_CB_ERROR, "Dropping non empty packet.n");
- kfree_skb(skb); /* Note : will be optimised with other kfree... */
- #endif /* PASS_CONNECT_PACKETS */
- }
- else
- kfree_skb(skb);
- DEXIT(IRDA_TCB_TRACE, "n");
- }
- /********************** IRDA-IAS/LMP CALLBACKS **********************/
- /*
- * These are the callbacks called by other layers of the IrDA stack,
- * mainly LMP for discovery and IAS for name queries.
- */
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_getvalue_confirm (result, obj_id, value, priv)
- *
- * Got answer from remote LM-IAS, just connect
- *
- * This is the reply to a IAS query we were doing to find the TSAP of
- * the device we want to connect to.
- * If we have found a valid TSAP, just initiate the TTP connection
- * on this TSAP.
- */
- static void
- irnet_getvalue_confirm(int result,
- __u16 obj_id,
- struct ias_value *value,
- void * priv)
- {
- irnet_socket * self = (irnet_socket *) priv;
- DENTER(IRDA_OCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!n");
- /* Check if already connected (via irnet_connect_socket())
- * or socket is closing down (via irda_irnet_destroy()) */
- if(! test_bit(0, &self->ttp_connect))
- {
- DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !n");
- return;
- }
- /* We probably don't need to make any more queries */
- iriap_close(self->iriap);
- self->iriap = NULL;
- /* Post process the IAS reply */
- self->dtsap_sel = irnet_ias_to_tsap(self, result, value);
- /* If error, just go out */
- if(self->errno)
- {
- clear_bit(0, &self->ttp_connect);
- DERROR(IRDA_OCB_ERROR, "IAS connect failed ! (0x%X)n", self->errno);
- return;
- }
- DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connectionn",
- self->daddr, self->dtsap_sel);
- /* Start up TTP - non blocking */
- irnet_connect_tsap(self);
- DEXIT(IRDA_OCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_discovervalue_confirm (result, obj_id, value, priv)
- *
- * Handle the TSAP discovery procedure state machine.
- * Got answer from remote LM-IAS, try next device
- *
- * We are doing a TSAP discovery procedure, and we got an answer to
- * a IAS query we were doing to find the TSAP on one of the address
- * in the discovery log.
- *
- * If we have found a valid TSAP for the first time, save it. If it's
- * not the first time we found one, complain.
- *
- * If we have more addresses in the log, just initiate a new query.
- * Note that those query may fail (see irnet_discover_daddr_and_lsap_sel())
- *
- * Otherwise, wrap up the procedure (cleanup), check if we have found
- * any device and connect to it.
- */
- static void
- irnet_discovervalue_confirm(int result,
- __u16 obj_id,
- struct ias_value *value,
- void * priv)
- {
- irnet_socket * self = (irnet_socket *) priv;
- __u8 dtsap_sel; /* TSAP we are looking for */
- DENTER(IRDA_OCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(self != NULL, , IRDA_OCB_ERROR, "Self is NULL !!!n");
- /* Check if already connected (via irnet_connect_socket())
- * or socket is closing down (via irda_irnet_destroy()) */
- if(! test_bit(0, &self->ttp_connect))
- {
- DERROR(IRDA_OCB_ERROR, "Socket no longer connecting. Ouch !n");
- return;
- }
- /* Post process the IAS reply */
- dtsap_sel = irnet_ias_to_tsap(self, result, value);
- /* Have we got something ? */
- if(self->errno == 0)
- {
- /* We found the requested service */
- if(self->daddr != DEV_ADDR_ANY)
- {
- DERROR(IRDA_OCB_ERROR, "More than one device in range supports IrNET...n");
- }
- else
- {
- /* First time we found that one, save it ! */
- self->daddr = self->discoveries[self->disco_index].daddr;
- self->dtsap_sel = dtsap_sel;
- }
- }
- /* If no failure */
- if((self->errno == -EADDRNOTAVAIL) || (self->errno == 0))
- {
- int ret;
- /* Search the next node */
- ret = irnet_discover_next_daddr(self);
- if(!ret)
- {
- /* In this case, the above request was non-blocking.
- * We will return here after a while... */
- return;
- }
- /* In this case, we have processed the last discovery item */
- }
- /* No more queries to be done (failure or last one) */
- /* We probably don't need to make any more queries */
- iriap_close(self->iriap);
- self->iriap = NULL;
- /* No more items : remove the log and signal termination */
- DEBUG(IRDA_OCB_INFO, "Cleaning up log (0x%X)n",
- (unsigned int) self->discoveries);
- if(self->discoveries != NULL)
- {
- /* Cleanup our copy of the discovery log */
- kfree(self->discoveries);
- self->discoveries = NULL;
- }
- self->disco_number = -1;
- /* Check out what we found */
- if(self->daddr == DEV_ADDR_ANY)
- {
- self->daddr = DEV_ADDR_ANY;
- clear_bit(0, &self->ttp_connect);
- DEXIT(IRDA_OCB_TRACE, ": cannot discover IrNET in any device !!!n");
- return;
- }
- /* We have a valid address - just connect */
- DEBUG(IRDA_OCB_INFO, "daddr = %08x, lsap = %d, starting IrTTP connectionn",
- self->daddr, self->dtsap_sel);
- /* Start up TTP - non blocking */
- irnet_connect_tsap(self);
- DEXIT(IRDA_OCB_TRACE, "n");
- }
- #ifdef DISCOVERY_EVENTS
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_discovery_indication (discovery)
- *
- * Got a discovery indication from IrLMP, post an event
- *
- * Note : IrLMP take care of matching the hint mask for us, we only
- * check if it is a "new" node...
- *
- * As IrLMP filter on the IrLAN hint bit, we get both IrLAN and IrNET
- * nodes, so it's only at connection time that we will know if the
- * node support IrNET, IrLAN or both. The other solution is to check
- * in IAS the PNP ids and service name.
- * Note : even if a node support IrNET (or IrLAN), it's no guarantee
- * that we will be able to connect to it, the node might already be
- * busy...
- *
- * One last thing : in some case, this function will trigger duplicate
- * discovery events. On the other hand, we should catch all
- * discoveries properly (i.e. not miss one). Filtering duplicate here
- * is to messy, so we leave that to user space...
- */
- static void
- irnet_discovery_indication(discovery_t *discovery,
- void * priv)
- {
- irnet_socket * self = &irnet_server.s;
-
- DENTER(IRDA_OCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
- "Invalid instance (0x%X) !!!n", (unsigned int) priv);
- /* Check if node is discovered is a new one or an old one.
- * We check when how long ago this node was discovered, with a
- * coarse timeout (we may miss some discovery events or be delayed).
- */
- if((jiffies - discovery->first_timestamp) >= (sysctl_discovery_timeout * HZ))
- {
- return; /* Too old, not interesting -> goodbye */
- }
- DEBUG(IRDA_OCB_INFO, "Discovered new IrNET/IrLAN node %s...n",
- discovery->nickname);
- /* Notify the control channel */
- irnet_post_event(NULL, IRNET_DISCOVER,
- discovery->saddr, discovery->daddr, discovery->nickname);
- DEXIT(IRDA_OCB_TRACE, "n");
- }
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_expiry_indication (expiry)
- *
- * Got a expiry indication from IrLMP, post an event
- *
- * Note : IrLMP take care of matching the hint mask for us, we only
- * check if it is a "new" node...
- */
- static void
- irnet_expiry_indication(discovery_t * expiry,
- void * priv)
- {
- irnet_socket * self = &irnet_server.s;
-
- DENTER(IRDA_OCB_TRACE, "(self=0x%X)n", (unsigned int) self);
- DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
- "Invalid instance (0x%X) !!!n", (unsigned int) priv);
- DEBUG(IRDA_OCB_INFO, "IrNET/IrLAN node %s expired...n",
- expiry->nickname);
- /* Notify the control channel */
- irnet_post_event(NULL, IRNET_EXPIRE,
- expiry->saddr, expiry->daddr, expiry->nickname);
- DEXIT(IRDA_OCB_TRACE, "n");
- }
- #endif /* DISCOVERY_EVENTS */
- /*********************** PROC ENTRY CALLBACKS ***********************/
- /*
- * We create a instance in the /proc filesystem, and here we take care
- * of that...
- */
- #ifdef CONFIG_PROC_FS
- /*------------------------------------------------------------------*/
- /*
- * Function irnet_proc_read (buf, start, offset, len, unused)
- *
- * Give some info to the /proc file system
- */
- static int
- irnet_proc_read(char * buf,
- char ** start,
- off_t offset,
- int len)
- {
- irnet_socket * self;
- char * state;
- unsigned long flags;
- int i = 0;
- len = 0;
-
- /* Get the IrNET server information... */
- len += sprintf(buf+len, "IrNET server - ");
- len += sprintf(buf+len, "IrDA state: %s, ",
- (irnet_server.running ? "running" : "dead"));
- len += sprintf(buf+len, "stsap_sel: %02x, ", irnet_server.s.stsap_sel);
- len += sprintf(buf+len, "dtsap_sel: %02xn", irnet_server.s.dtsap_sel);
- /* Do we need to continue ? */
- if(!irnet_server.running)
- return len;
- /* Protect access to the instance list */
- spin_lock_irqsave(&irnet_server.spinlock, flags);
- /* Get the sockets one by one... */
- self = (irnet_socket *) hashbin_get_first(irnet_server.list);
- while(self != NULL)
- {
- /* Start printing info about the socket. */
- len += sprintf(buf+len, "nIrNET socket %d - ", i++);
- /* First, get the requested configuration */
- len += sprintf(buf+len, "Requested IrDA name: "%s", ", self->rname);
- len += sprintf(buf+len, "daddr: %08x, ", self->rdaddr);
- len += sprintf(buf+len, "saddr: %08xn", self->rsaddr);
- /* Second, get all the PPP info */
- len += sprintf(buf+len, " PPP state: %s",
- (self->ppp_open ? "registered" : "unregistered"));
- if(self->ppp_open)
- {
- len += sprintf(buf+len, ", unit: ppp%d",
- ppp_unit_number(&self->chan));
- len += sprintf(buf+len, ", channel: %d",
- ppp_channel_index(&self->chan));
- len += sprintf(buf+len, ", mru: %d",
- self->mru);
- /* Maybe add self->flags ? Later... */
- }
- /* Then, get all the IrDA specific info... */
- if(self->ttp_open)
- state = "connected";
- else
- if(self->tsap != NULL)
- state = "connecting";
- else
- if(self->iriap != NULL)
- state = "searching";
- else
- if(self->ttp_connect)
- state = "weird";
- else
- state = "idle";
- len += sprintf(buf+len, "n IrDA state: %s, ", state);
- len += sprintf(buf+len, "daddr: %08x, ", self->daddr);
- len += sprintf(buf+len, "stsap_sel: %02x, ", self->stsap_sel);
- len += sprintf(buf+len, "dtsap_sel: %02xn", self->dtsap_sel);
- /* Next socket, please... */
- self = (irnet_socket *) hashbin_get_next(irnet_server.list);
- }
- /* Spin lock end */
- spin_unlock_irqrestore(&irnet_server.spinlock, flags);
- return len;
- }
- #endif /* PROC_FS */
- /********************** CONFIGURATION/CLEANUP **********************/
- /*
- * Initialisation and teardown of the IrDA part, called at module
- * insertion and removal...
- */
- /*------------------------------------------------------------------*/
- /*
- * Prepare the IrNET layer for operation...
- */
- int
- irda_irnet_init(void)
- {
- int err = 0;
- DENTER(MODULE_TRACE, "()n");
- /* Pure paranoia - should be redundant */
- memset(&irnet_server, 0, sizeof(struct irnet_root));
- /* Setup start of irnet instance list */
- irnet_server.list = hashbin_new(HB_NOLOCK);
- DABORT(irnet_server.list == NULL, -ENOMEM,
- MODULE_ERROR, "Can't allocate hashbin!n");
- /* Init spinlock for instance list */
- spin_lock_init(&irnet_server.spinlock);
- /* Initialise control channel */
- init_waitqueue_head(&irnet_events.rwait);
- irnet_events.index = 0;
- /* Init spinlock for event logging */
- spin_lock_init(&irnet_events.spinlock);
- #ifdef CONFIG_PROC_FS
- /* Add a /proc file for irnet infos */
- create_proc_info_entry("irnet", 0, proc_irda, irnet_proc_read);
- #endif /* CONFIG_PROC_FS */
- /* Setup the IrNET server */
- err = irnet_setup_server();
- if(!err)
- /* We are no longer functional... */
- irnet_server.running = 1;
- DEXIT(MODULE_TRACE, "n");
- return err;
- }
- /*------------------------------------------------------------------*/
- /*
- * Cleanup at exit...
- */
- void
- irda_irnet_cleanup(void)
- {
- DENTER(MODULE_TRACE, "()n");
- /* We are no longer there... */
- irnet_server.running = 0;
- #ifdef CONFIG_PROC_FS
- /* Remove our /proc file */
- remove_proc_entry("irnet", proc_irda);
- #endif /* CONFIG_PROC_FS */
- /* Remove our IrNET server from existence */
- irnet_destroy_server();
- /* Remove all instances of IrNET socket still present */
- hashbin_delete(irnet_server.list, (FREE_FUNC) irda_irnet_destroy);
- DEXIT(MODULE_TRACE, "n");
- }