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linux/net/irda/irnet/irnet_irda.c
Eric Dumazet a02cec2155 net: return operator cleanup 
Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-09-23 14:33:39 -07:00

1885 lines
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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(&notify);
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,
&notify);
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");
#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");
}
/************************ 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%p, skb=0x%p)\n",
ap, 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 not 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%p)\n", 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, 0);
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, 0);
/* 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;
}
/* Cleanup the socket in case we want to reconnect in ppp_output_wakeup() */
self->stsap_sel = 0;
self->daddr = DEV_ADDR_ANY;
self->tx_flow = FLOW_START;
/* Deal with the ppp instance if it's still alive */
if(self->ppp_open)
{
if(test_open)
{
/* ppp_unregister_channel() wants a user context. */
schedule_work(&self->disconnect_work);
}
else
{
/* If we were trying to connect, flush (drain) ppp_generic
* Tx queue (most often we have blocked it), which will
* trigger an other attempt to connect. If we are passive,
* this will empty the Tx queue after last try. */
ppp_output_wakeup(&self->chan);
}
}
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%p)\n", 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, 0);
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%p, flow=%d)\n", 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 again\n");
/* 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 down\n");
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%p)\n", 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, 0);
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%p)\n", server);
DASSERT(instance == &irnet_server, , IRDA_CB_ERROR,
"Invalid instance (0x%p) !!!\n", 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;
}
/* The following code is a bit tricky, so need comments ;-)
*/
/* If ttp_connect is set, 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.
* Because IrNET can be peer to peer, we need to workaround this.
* Furthermore, the way the irnetd script is implemented, the
* target will create a second IrNET connection back to the
* originator and expect the originator to bind this new connection
* to the original PPPD instance.
* And of course, if we don't use irnetd, we can have a race when
* both side try to connect simultaneously, which could leave both
* connections half closed (yuck).
* Conclusions :
* 1) The "originator" must accept the new connection and get rid
* of the old one so that irnetd works
* 2) One side must deny the new connection to avoid races,
* but both side must agree on which side it is...
* Most often, the originator is primary at the LAP layer.
* Jean II
*/
/* Now, let's look at the way I wrote the test...
* We need to clear up the ttp_connect flag atomically to prevent
* irnet_disconnect_indication() to mess up the tsap we are going to close.
* We want to clear the ttp_connect flag only if we close the tsap,
* otherwise we will never close it, so we need to check for primary
* *before* doing the test on the flag.
* And of course, ALLOW_SIMULT_CONNECT can disable this entirely...
* Jean II
*/
/* Socket already connecting ? On primary ? */
if(0
#ifdef ALLOW_SIMULT_CONNECT
|| ((irttp_is_primary(server->tsap) == 1) && /* primary */
(test_and_clear_bit(0, &new->ttp_connect)))
#endif /* ALLOW_SIMULT_CONNECT */
)
{
DERROR(IRDA_CB_ERROR, "Socket already connecting, but going to reuse it !\n");
/* Cleanup the old TSAP if necessary - IrIAP will be cleaned up later */
if(new->tsap != NULL)
{
/* Close the old connection the new socket was attempting,
* so that we can hook it up to the new connection.
* It's now safe to do it... */
irttp_close_tsap(new->tsap);
new->tsap = NULL;
}
}
else
{
/* Three options :
* 1) socket was not connecting or connected : ttp_connect should be 0.
* 2) we don't want to connect the socket because we are secondary or
* ALLOW_SIMULT_CONNECT is undefined. ttp_connect should be 1.
* 3) we are half way in irnet_disconnect_indication(), and it's a
* nice race condition... Fortunately, we can detect that by checking
* if tsap is still alive. On the other hand, we can't be in
* irda_irnet_destroy() otherwise we would not have found this
* socket in the hashbin.
* Jean II */
if((test_bit(0, &new->ttp_connect)) || (new->tsap != NULL))
{
/* Don't mess this socket, somebody else in in charge... */
DERROR(IRDA_CB_ERROR, "Race condition detected, socket in use, 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%p)\n", 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 connection\n",
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%p)\n", 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%p)\n",
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 connection\n",
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, and also
* check if it is a "new" node for us...
*
* 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(discinfo_t * discovery,
DISCOVERY_MODE mode,
void * priv)
{
irnet_socket * self = &irnet_server.s;
DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
"Invalid instance (0x%p) !!!\n", priv);
DEBUG(IRDA_OCB_INFO, "Discovered new IrNET/IrLAN node %s...\n",
discovery->info);
/* Notify the control channel */
irnet_post_event(NULL, IRNET_DISCOVER,
discovery->saddr, discovery->daddr, discovery->info,
get_unaligned((__u16 *)discovery->hints));
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(discinfo_t * expiry,
DISCOVERY_MODE mode,
void * priv)
{
irnet_socket * self = &irnet_server.s;
DENTER(IRDA_OCB_TRACE, "(self=0x%p)\n", self);
DASSERT(priv == &irnet_server, , IRDA_OCB_ERROR,
"Invalid instance (0x%p) !!!\n", priv);
DEBUG(IRDA_OCB_INFO, "IrNET/IrLAN node %s expired...\n",
expiry->info);
/* Notify the control channel */
irnet_post_event(NULL, IRNET_EXPIRE,
expiry->saddr, expiry->daddr, expiry->info,
get_unaligned((__u16 *)expiry->hints));
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
static int
irnet_proc_show(struct seq_file *m, void *v)
{
irnet_socket * self;
char * state;
int i = 0;
/* Get the IrNET server information... */
seq_printf(m, "IrNET server - ");
seq_printf(m, "IrDA state: %s, ",
(irnet_server.running ? "running" : "dead"));
seq_printf(m, "stsap_sel: %02x, ", irnet_server.s.stsap_sel);
seq_printf(m, "dtsap_sel: %02x\n", irnet_server.s.dtsap_sel);
/* Do we need to continue ? */
if(!irnet_server.running)
return 0;
/* Protect access to the instance list */
spin_lock_bh(&irnet_server.spinlock);
/* Get the sockets one by one... */
self = (irnet_socket *) hashbin_get_first(irnet_server.list);
while(self != NULL)
{
/* Start printing info about the socket. */
seq_printf(m, "\nIrNET socket %d - ", i++);
/* First, get the requested configuration */
seq_printf(m, "Requested IrDA name: \"%s\", ", self->rname);
seq_printf(m, "daddr: %08x, ", self->rdaddr);
seq_printf(m, "saddr: %08x\n", self->rsaddr);
/* Second, get all the PPP info */
seq_printf(m, " PPP state: %s",
(self->ppp_open ? "registered" : "unregistered"));
if(self->ppp_open)
{
seq_printf(m, ", unit: ppp%d",
ppp_unit_number(&self->chan));
seq_printf(m, ", channel: %d",
ppp_channel_index(&self->chan));
seq_printf(m, ", 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";
seq_printf(m, "\n IrDA state: %s, ", state);
seq_printf(m, "daddr: %08x, ", self->daddr);
seq_printf(m, "stsap_sel: %02x, ", self->stsap_sel);
seq_printf(m, "dtsap_sel: %02x\n", self->dtsap_sel);
/* Next socket, please... */
self = (irnet_socket *) hashbin_get_next(irnet_server.list);
}
/* Spin lock end */
spin_unlock_bh(&irnet_server.spinlock);
return 0;
}
static int irnet_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, irnet_proc_show, NULL);
}
static const struct file_operations irnet_proc_fops = {
.owner = THIS_MODULE,
.open = irnet_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#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 __init
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 */
proc_create("irnet", 0, proc_irda, &irnet_proc_fops);
#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 __exit
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");
}
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