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irnet_irda.c
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/*
* 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 */
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <asm/unaligned.h>
/*
* PPP disconnect work: we need to make sure we're in
* process context when calling ppp_unregister_channel().
*/
static void irnet_ppp_disconnect(struct work_struct *work)
{
irnet_socket * self =
container_of(work, irnet_socket, disconnect_work);
if (self == NULL)
return;
/*
* If we were connected, cleanup & close the PPP
* channel, which will kill pppd (hangup) and the rest.
*/
if (self->ppp_open && !self->ttp_open && !self->ttp_connect) {
ppp_unregister_channel(&self->chan);
self->ppp_open = 0;
}
}
/************************* CONTROL CHANNEL *************************/
/*
* When ppp is not active, /dev/irnet act as a control channel.
* Writing 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,
__u16 hints)
{
int index; /* In the log */
DENTER(CTRL_TRACE, "(ap=0x%p, event=%d, daddr=%08x, name=``%s'')\n",
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_bh(&irnet_events.spinlock);
/* 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] = '\0';
/* Copy hints */
irnet_events.log[index].hints.word = hints;
/* 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 %d\n", irnet_events.index);
/* Spin lock end */
spin_unlock_bh(&irnet_events.spinlock);
/* 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%p)\n", 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;
strlcpy(notify.name, IRNET_NOTIFY_NAME, sizeof(notify.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%p, sel=0x%X\n",
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%p)\n", 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=%d\n", 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 == NULL\n");
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%p)\n", 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%p)\n", 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);
if(self->iriap == NULL)
return -ENOMEM;
/* 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%p)\n", 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%p), size is %d\n",
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 */
if(self->iriap)
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%p)\n", 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%p)\n", 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] = '\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 */
INIT_WORK(&self->disconnect_work, irnet_ppp_disconnect);
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%p)\n", 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))
{
spin_lock_bh(&irnet_server.spinlock);
hashbin_insert(irnet_server.list, (irda_queue_t *) self, 0, self->rname);
spin_unlock_bh(&irnet_server.spinlock);
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] == '\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%p)\n", 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;
DEBUG(IRDA_SOCK_INFO, "Removing from hash..\n");
spin_lock_bh(&irnet_server.spinlock);
entry = hashbin_remove_this(irnet_server.list, (irda_queue_t *) self);
self->q.q_next = NULL;
spin_unlock_bh(&irnet_server.spinlock);
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, 0);
}
/* 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 or control channel */
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");
}
/************************** 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%p)\n", 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.. */
strlcpy(self->rname, discoveries[i].info, sizeof(self->rname));
self->rname[sizeof(self->rname) - 1] = '\0';
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;
int err;
DENTER(IRDA_SERV_TRACE, "(self=0x%p)\n", 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_bh(&irnet_server.spinlock);
/* 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%p matches rname ``%s''.\n",
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%p matches daddr %#08x.\n",
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] == '\0') && (new->ppp_open))
{
/* Yes !!! Get it.. */
DEBUG(IRDA_SERV_INFO, "Socket 0x%p is free.\n",
new);
break;
}
new = (irnet_socket *) hashbin_get_next(irnet_server.list);
}
}
/* Spin lock end */
spin_unlock_bh(&irnet_server.spinlock);
DEXIT(IRDA_SERV_TRACE, " - new = 0x%p\n", 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%p, new=0x%p)\n",
server, 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 being 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, 0);
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%p)\n", 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, 0);
/* Clean up the server to keep it in listen state */
irttp_listen(self->tsap);
DEXIT(IRDA_SERV_TRACE, "\n");
}
/*------------------------------------------------------------------*/
/*
* 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%p\n", &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");