Linux-2.6.12-rc2

[mirror_ubuntu-artful-kernel.git] / net / irda / af_irda.c

/*********************************************************************
 *
 * Filename:      af_irda.c
 * Version:       0.9
 * Description:   IrDA sockets implementation
 * Status:        Stable
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun May 31 10:12:43 1998
 * Modified at:   Sat Dec 25 21:10:23 1999
 * Modified by:   Dag Brattli <dag@brattli.net>
 * Sources:       af_netroom.c, af_ax25.c, af_rose.c, af_x25.c etc.
 *
 *     Copyright (c) 1999 Dag Brattli <dagb@cs.uit.no>
 *     Copyright (c) 1999-2003 Jean Tourrilhes <jt@hpl.hp.com>
 *     All Rights Reserved.
 *
 *     This program is free software; you can redistribute it and/or
 *     modify it under the terms of the GNU General Public License as
 *     published by the Free Software Foundation; either version 2 of
 *     the License, or (at your option) any later version.
 *
 *     This program is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 *     GNU General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program; if not, write to the Free Software
 *     Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *     MA 02111-1307 USA
 *
 *     Linux-IrDA now supports four different types of IrDA sockets:
 *
 *     o SOCK_STREAM:    TinyTP connections with SAR disabled. The
 *                       max SDU size is 0 for conn. of this type
 *     o SOCK_SEQPACKET: TinyTP connections with SAR enabled. TTP may
 *                       fragment the messages, but will preserve
 *                       the message boundaries
 *     o SOCK_DGRAM:     IRDAPROTO_UNITDATA: TinyTP connections with Unitdata
 *                       (unreliable) transfers
 *                       IRDAPROTO_ULTRA: Connectionless and unreliable data
 *
 ********************************************************************/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/irda.h>
#include <linux/poll.h>

#include <asm/ioctls.h>         /* TIOCOUTQ, TIOCINQ */
#include <asm/uaccess.h>

#include <net/sock.h>
#include <net/tcp.h>

#include <net/irda/af_irda.h>

static int irda_create(struct socket *sock, int protocol);

static struct proto_ops irda_stream_ops;
static struct proto_ops irda_seqpacket_ops;
static struct proto_ops irda_dgram_ops;

#ifdef CONFIG_IRDA_ULTRA
static struct proto_ops irda_ultra_ops;
#define ULTRA_MAX_DATA 382
#endif /* CONFIG_IRDA_ULTRA */

#define IRDA_MAX_HEADER (TTP_MAX_HEADER)

/*
 * Function irda_data_indication (instance, sap, skb)
 *
 *    Received some data from TinyTP. Just queue it on the receive queue
 *
 */
static int irda_data_indication(void *instance, void *sap, struct sk_buff *skb)
{
        struct irda_sock *self;
        struct sock *sk;
        int err;

        IRDA_DEBUG(3, "%s()\n", __FUNCTION__);

        self = instance;
        sk = instance;
        IRDA_ASSERT(sk != NULL, return -1;);

        err = sock_queue_rcv_skb(sk, skb);
        if (err) {
                IRDA_DEBUG(1, "%s(), error: no more mem!\n", __FUNCTION__);
                self->rx_flow = FLOW_STOP;

                /* When we return error, TTP will need to requeue the skb */
                return err;
        }

        return 0;
}

/*
 * Function irda_disconnect_indication (instance, sap, reason, skb)
 *
 *    Connection has been closed. Check reason to find out why
 *
 */
static void irda_disconnect_indication(void *instance, void *sap,
                                       LM_REASON reason, struct sk_buff *skb)
{
        struct irda_sock *self;
        struct sock *sk;

        self = instance;

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        /* Don't care about it, but let's not leak it */
        if(skb)
                dev_kfree_skb(skb);

        sk = instance;
        if (sk == NULL) {
                IRDA_DEBUG(0, "%s(%p) : BUG : sk is NULL\n",
                           __FUNCTION__, self);
                return;
        }

        /* Prevent race conditions with irda_release() and irda_shutdown() */
        if (!sock_flag(sk, SOCK_DEAD) && sk->sk_state != TCP_CLOSE) {
                sk->sk_state     = TCP_CLOSE;
                sk->sk_err       = ECONNRESET;
                sk->sk_shutdown |= SEND_SHUTDOWN;

                sk->sk_state_change(sk);
                /* Uh-oh... Should use sock_orphan ? */
                sock_set_flag(sk, SOCK_DEAD);

                /* Close our TSAP.
                 * If we leave it open, IrLMP put it back into the list of
                 * unconnected LSAPs. The problem is that any incoming request
                 * can then be matched to this socket (and it will be, because
                 * it is at the head of the list). This would prevent any
                 * listening socket waiting on the same TSAP to get those
                 * requests. Some apps forget to close sockets, or hang to it
                 * a bit too long, so we may stay in this dead state long
                 * enough to be noticed...
                 * Note : all socket function do check sk->sk_state, so we are
                 * safe...
                 * Jean II
                 */
                if (self->tsap) {
                        irttp_close_tsap(self->tsap);
                        self->tsap = NULL;
                }
        }

        /* Note : once we are there, there is not much you want to do
         * with the socket anymore, apart from closing it.
         * For example, bind() and connect() won't reset sk->sk_err,
         * sk->sk_shutdown and sk->sk_flags to valid values...
         * Jean II
         */
}

/*
 * Function irda_connect_confirm (instance, sap, qos, max_sdu_size, skb)
 *
 *    Connections has been confirmed by the remote device
 *
 */
static void irda_connect_confirm(void *instance, void *sap,
                                 struct qos_info *qos,
                                 __u32 max_sdu_size, __u8 max_header_size,
                                 struct sk_buff *skb)
{
        struct irda_sock *self;
        struct sock *sk;

        self = instance;

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        sk = instance;
        if (sk == NULL) {
                dev_kfree_skb(skb);
                return;
        }

        dev_kfree_skb(skb);
        // Should be ??? skb_queue_tail(&sk->sk_receive_queue, skb);

        /* 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;

        /* Find out what the largest chunk of data that we can transmit is */
        switch (sk->sk_type) {
        case SOCK_STREAM:
                if (max_sdu_size != 0) {
                        IRDA_ERROR("%s: max_sdu_size must be 0\n",
                                   __FUNCTION__);
                        return;
                }
                self->max_data_size = irttp_get_max_seg_size(self->tsap);
                break;
        case SOCK_SEQPACKET:
                if (max_sdu_size == 0) {
                        IRDA_ERROR("%s: max_sdu_size cannot be 0\n",
                                   __FUNCTION__);
                        return;
                }
                self->max_data_size = max_sdu_size;
                break;
        default:
                self->max_data_size = irttp_get_max_seg_size(self->tsap);
        };

        IRDA_DEBUG(2, "%s(), max_data_size=%d\n", __FUNCTION__,
                   self->max_data_size);

        memcpy(&self->qos_tx, qos, sizeof(struct qos_info));

        /* We are now connected! */
        sk->sk_state = TCP_ESTABLISHED;
        sk->sk_state_change(sk);
}

/*
 * Function irda_connect_indication(instance, sap, qos, max_sdu_size, userdata)
 *
 *    Incoming connection
 *
 */
static void irda_connect_indication(void *instance, void *sap,
                                    struct qos_info *qos, __u32 max_sdu_size,
                                    __u8 max_header_size, struct sk_buff *skb)
{
        struct irda_sock *self;
        struct sock *sk;

        self = instance;

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        sk = instance;
        if (sk == NULL) {
                dev_kfree_skb(skb);
                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;

        /* Find out what the largest chunk of data that we can transmit is */
        switch (sk->sk_type) {
        case SOCK_STREAM:
                if (max_sdu_size != 0) {
                        IRDA_ERROR("%s: max_sdu_size must be 0\n",
                                   __FUNCTION__);
                        kfree_skb(skb);
                        return;
                }
                self->max_data_size = irttp_get_max_seg_size(self->tsap);
                break;
        case SOCK_SEQPACKET:
                if (max_sdu_size == 0) {
                        IRDA_ERROR("%s: max_sdu_size cannot be 0\n",
                                   __FUNCTION__);
                        kfree_skb(skb);
                        return;
                }
                self->max_data_size = max_sdu_size;
                break;
        default:
                self->max_data_size = irttp_get_max_seg_size(self->tsap);
        };

        IRDA_DEBUG(2, "%s(), max_data_size=%d\n", __FUNCTION__,
                   self->max_data_size);

        memcpy(&self->qos_tx, qos, sizeof(struct qos_info));

        skb_queue_tail(&sk->sk_receive_queue, skb);
        sk->sk_state_change(sk);
}

/*
 * Function irda_connect_response (handle)
 *
 *    Accept incoming connection
 *
 */
static void irda_connect_response(struct irda_sock *self)
{
        struct sk_buff *skb;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return;);

        skb = dev_alloc_skb(64);
        if (skb == NULL) {
                IRDA_DEBUG(0, "%s() Unable to allocate sk_buff!\n",
                           __FUNCTION__);
                return;
        }

        /* Reserve space for MUX_CONTROL and LAP header */
        skb_reserve(skb, IRDA_MAX_HEADER);

        irttp_connect_response(self->tsap, self->max_sdu_size_rx, skb);
}

/*
 * Function irda_flow_indication (instance, sap, flow)
 *
 *    Used by TinyTP to tell us if it can accept more data or not
 *
 */
static void irda_flow_indication(void *instance, void *sap, LOCAL_FLOW flow)
{
        struct irda_sock *self;
        struct sock *sk;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        self = instance;
        sk = instance;
        IRDA_ASSERT(sk != NULL, return;);

        switch (flow) {
        case FLOW_STOP:
                IRDA_DEBUG(1, "%s(), IrTTP wants us to slow down\n",
                           __FUNCTION__);
                self->tx_flow = flow;
                break;
        case FLOW_START:
                self->tx_flow = flow;
                IRDA_DEBUG(1, "%s(), IrTTP wants us to start again\n",
                           __FUNCTION__);
                wake_up_interruptible(sk->sk_sleep);
                break;
        default:
                IRDA_DEBUG(0, "%s(), Unknown flow command!\n", __FUNCTION__);
                /* Unknown flow command, better stop */
                self->tx_flow = flow;
                break;
        }
}

/*
 * Function irda_getvalue_confirm (obj_id, value, priv)
 *
 *    Got answer from remote LM-IAS, just pass object to requester...
 *
 * Note : duplicate from above, but we need our own version that
 * doesn't touch the dtsap_sel and save the full value structure...
 */
static void irda_getvalue_confirm(int result, __u16 obj_id,
                                  struct ias_value *value, void *priv)
{
        struct irda_sock *self;

        self = (struct irda_sock *) priv;
        if (!self) {
                IRDA_WARNING("%s: lost myself!\n", __FUNCTION__);
                return;
        }

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        /* We probably don't need to make any more queries */
        iriap_close(self->iriap);
        self->iriap = NULL;

        /* Check if request succeeded */
        if (result != IAS_SUCCESS) {
                IRDA_DEBUG(1, "%s(), IAS query failed! (%d)\n", __FUNCTION__,
                           result);

                self->errno = result;   /* We really need it later */

                /* Wake up any processes waiting for result */
                wake_up_interruptible(&self->query_wait);

                return;
        }

        /* Pass the object to the caller (so the caller must delete it) */
        self->ias_result = value;
        self->errno = 0;

        /* Wake up any processes waiting for result */
        wake_up_interruptible(&self->query_wait);
}

/*
 * Function irda_selective_discovery_indication (discovery)
 *
 *    Got a selective discovery indication from IrLMP.
 *
 * IrLMP is telling us that this node is new and matching our hint bit
 * filter. Wake up any process waiting for answer...
 */
static void irda_selective_discovery_indication(discinfo_t *discovery,
                                                DISCOVERY_MODE mode,
                                                void *priv)
{
        struct irda_sock *self;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        self = (struct irda_sock *) priv;
        if (!self) {
                IRDA_WARNING("%s: lost myself!\n", __FUNCTION__);
                return;
        }

        /* Pass parameter to the caller */
        self->cachedaddr = discovery->daddr;

        /* Wake up process if its waiting for device to be discovered */
        wake_up_interruptible(&self->query_wait);
}

/*
 * Function irda_discovery_timeout (priv)
 *
 *    Timeout in the selective discovery process
 *
 * We were waiting for a node to be discovered, but nothing has come up
 * so far. Wake up the user and tell him that we failed...
 */
static void irda_discovery_timeout(u_long priv)
{
        struct irda_sock *self;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        self = (struct irda_sock *) priv;
        IRDA_ASSERT(self != NULL, return;);

        /* Nothing for the caller */
        self->cachelog = NULL;
        self->cachedaddr = 0;
        self->errno = -ETIME;

        /* Wake up process if its still waiting... */
        wake_up_interruptible(&self->query_wait);
}

/*
 * Function irda_open_tsap (self)
 *
 *    Open local Transport Service Access Point (TSAP)
 *
 */
static int irda_open_tsap(struct irda_sock *self, __u8 tsap_sel, char *name)
{
        notify_t notify;

        if (self->tsap) {
                IRDA_WARNING("%s: busy!\n", __FUNCTION__);
                return -EBUSY;
        }

        /* Initialize callbacks to be used by the IrDA stack */
        irda_notify_init(&notify);
        notify.connect_confirm       = irda_connect_confirm;
        notify.connect_indication    = irda_connect_indication;
        notify.disconnect_indication = irda_disconnect_indication;
        notify.data_indication       = irda_data_indication;
        notify.udata_indication      = irda_data_indication;
        notify.flow_indication       = irda_flow_indication;
        notify.instance = self;
        strncpy(notify.name, name, NOTIFY_MAX_NAME);

        self->tsap = irttp_open_tsap(tsap_sel, DEFAULT_INITIAL_CREDIT,
                                     &notify);
        if (self->tsap == NULL) {
                IRDA_DEBUG(0, "%s(), Unable to allocate TSAP!\n",
                           __FUNCTION__);
                return -ENOMEM;
        }
        /* Remember which TSAP selector we actually got */
        self->stsap_sel = self->tsap->stsap_sel;

        return 0;
}

/*
 * Function irda_open_lsap (self)
 *
 *    Open local Link Service Access Point (LSAP). Used for opening Ultra
 *    sockets
 */
#ifdef CONFIG_IRDA_ULTRA
static int irda_open_lsap(struct irda_sock *self, int pid)
{
        notify_t notify;

        if (self->lsap) {
                IRDA_WARNING("%s(), busy!\n", __FUNCTION__);
                return -EBUSY;
        }

        /* Initialize callbacks to be used by the IrDA stack */
        irda_notify_init(&notify);
        notify.udata_indication = irda_data_indication;
        notify.instance = self;
        strncpy(notify.name, "Ultra", NOTIFY_MAX_NAME);

        self->lsap = irlmp_open_lsap(LSAP_CONNLESS, &notify, pid);
        if (self->lsap == NULL) {
                IRDA_DEBUG( 0, "%s(), Unable to allocate LSAP!\n", __FUNCTION__);
                return -ENOMEM;
        }

        return 0;
}
#endif /* CONFIG_IRDA_ULTRA */

/*
 * Function irda_find_lsap_sel (self, name)
 *
 *    Try to lookup LSAP selector in remote LM-IAS
 *
 * Basically, we start a IAP query, and then go to sleep. When the query
 * return, irda_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 int irda_find_lsap_sel(struct irda_sock *self, char *name)
{
        IRDA_DEBUG(2, "%s(%p, %s)\n", __FUNCTION__, self, name);

        IRDA_ASSERT(self != NULL, return -1;);

        if (self->iriap) {
                IRDA_WARNING("%s(): busy with a previous query\n",
                             __FUNCTION__);
                return -EBUSY;
        }

        self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
                                 irda_getvalue_confirm);
        if(self->iriap == NULL)
                return -ENOMEM;

        /* Treat unexpected wakeup as disconnect */
        self->errno = -EHOSTUNREACH;

        /* Query remote LM-IAS */
        iriap_getvaluebyclass_request(self->iriap, self->saddr, self->daddr,
                                      name, "IrDA:TinyTP:LsapSel");

        /* Wait for answer, if not yet finished (or failed) */
        if (wait_event_interruptible(self->query_wait, (self->iriap==NULL)))
                /* Treat signals as disconnect */
                return -EHOSTUNREACH;

        /* Check what happened */
        if (self->errno)
        {
                /* Requested object/attribute doesn't exist */
                if((self->errno == IAS_CLASS_UNKNOWN) ||
                   (self->errno == IAS_ATTRIB_UNKNOWN))
                        return (-EADDRNOTAVAIL);
                else
                        return (-EHOSTUNREACH);
        }

        /* Get the remote TSAP selector */
        switch (self->ias_result->type) {
        case IAS_INTEGER:
                IRDA_DEBUG(4, "%s() int=%d\n",
                           __FUNCTION__, self->ias_result->t.integer);

                if (self->ias_result->t.integer != -1)
                        self->dtsap_sel = self->ias_result->t.integer;
                else
                        self->dtsap_sel = 0;
                break;
        default:
                self->dtsap_sel = 0;
                IRDA_DEBUG(0, "%s(), bad type!\n", __FUNCTION__);
                break;
        }
        if (self->ias_result)
                irias_delete_value(self->ias_result);

        if (self->dtsap_sel)
                return 0;

        return -EADDRNOTAVAIL;
}

/*
 * Function irda_discover_daddr_and_lsap_sel (self, name)
 *
 *    This try to find a device with the requested service.
 *
 * 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).
 * The, we set both the destination address and the lsap selector to point
 * on the service on the unique device we have found.
 *
 * Note : this function fails if there is more than one device in range,
 * because IrLMP doesn't disconnect the LAP when the last LSAP is closed.
 * Moreover, we would need to wait the LAP disconnection...
 */
static int irda_discover_daddr_and_lsap_sel(struct irda_sock *self, char *name)
{
        discinfo_t *discoveries;        /* Copy of the discovery log */
        int     number;                 /* Number of nodes in the log */
        int     i;
        int     err = -ENETUNREACH;
        __u32   daddr = DEV_ADDR_ANY;   /* Address we found the service on */
        __u8    dtsap_sel = 0x0;        /* TSAP associated with it */

        IRDA_DEBUG(2, "%s(), name=%s\n", __FUNCTION__, name);

        IRDA_ASSERT(self != NULL, return -1;);

        /* Ask lmp for the current discovery log
         * Note : we have to use irlmp_get_discoveries(), as opposed
         * to play with the cachelog directly, because while we are
         * making our ias query, le log might change... */
        discoveries = irlmp_get_discoveries(&number, self->mask.word,
                                            self->nslots);
        /* Check if the we got some results */
        if (discoveries == NULL)
                return -ENETUNREACH;    /* No nodes discovered */

        /*
         * 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++) {
                /* Try the address in the log */
                self->daddr = discoveries[i].daddr;
                self->saddr = 0x0;
                IRDA_DEBUG(1, "%s(), trying daddr = %08x\n",
                           __FUNCTION__, self->daddr);

                /* Query remote LM-IAS for this service */
                err = irda_find_lsap_sel(self, name);
                switch (err) {
                case 0:
                        /* We found the requested service */
                        if(daddr != DEV_ADDR_ANY) {
                                IRDA_DEBUG(1, "%s(), discovered service ''%s'' in two different devices !!!\n",
                                           __FUNCTION__, name);
                                self->daddr = DEV_ADDR_ANY;
                                kfree(discoveries);
                                return(-ENOTUNIQ);
                        }
                        /* First time we found that one, save it ! */
                        daddr = self->daddr;
                        dtsap_sel = self->dtsap_sel;
                        break;
                case -EADDRNOTAVAIL:
                        /* Requested service simply doesn't exist on this node */
                        break;
                default:
                        /* Something bad did happen :-( */
                        IRDA_DEBUG(0, "%s(), unexpected IAS query failure\n", __FUNCTION__);
                        self->daddr = DEV_ADDR_ANY;
                        kfree(discoveries);
                        return(-EHOSTUNREACH);
                        break;
                }
        }
        /* Cleanup our copy of the discovery log */
        kfree(discoveries);

        /* Check out what we found */
        if(daddr == DEV_ADDR_ANY) {
                IRDA_DEBUG(1, "%s(), cannot discover service ''%s'' in any device !!!\n",
                           __FUNCTION__, name);
                self->daddr = DEV_ADDR_ANY;
                return(-EADDRNOTAVAIL);
        }

        /* Revert back to discovered device & service */
        self->daddr = daddr;
        self->saddr = 0x0;
        self->dtsap_sel = dtsap_sel;

        IRDA_DEBUG(1, "%s(), discovered requested service ''%s'' at address %08x\n",
                   __FUNCTION__, name, self->daddr);

        return 0;
}

/*
 * Function irda_getname (sock, uaddr, uaddr_len, peer)
 *
 *    Return the our own, or peers socket address (sockaddr_irda)
 *
 */
static int irda_getname(struct socket *sock, struct sockaddr *uaddr,
                        int *uaddr_len, int peer)
{
        struct sockaddr_irda saddr;
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);

        if (peer) {
                if (sk->sk_state != TCP_ESTABLISHED)
                        return -ENOTCONN;

                saddr.sir_family = AF_IRDA;
                saddr.sir_lsap_sel = self->dtsap_sel;
                saddr.sir_addr = self->daddr;
        } else {
                saddr.sir_family = AF_IRDA;
                saddr.sir_lsap_sel = self->stsap_sel;
                saddr.sir_addr = self->saddr;
        }

        IRDA_DEBUG(1, "%s(), tsap_sel = %#x\n", __FUNCTION__, saddr.sir_lsap_sel);
        IRDA_DEBUG(1, "%s(), addr = %08x\n", __FUNCTION__, saddr.sir_addr);

        /* uaddr_len come to us uninitialised */
        *uaddr_len = sizeof (struct sockaddr_irda);
        memcpy(uaddr, &saddr, *uaddr_len);

        return 0;
}

/*
 * Function irda_listen (sock, backlog)
 *
 *    Just move to the listen state
 *
 */
static int irda_listen(struct socket *sock, int backlog)
{
        struct sock *sk = sock->sk;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        if ((sk->sk_type != SOCK_STREAM) && (sk->sk_type != SOCK_SEQPACKET) &&
            (sk->sk_type != SOCK_DGRAM))
                return -EOPNOTSUPP;

        if (sk->sk_state != TCP_LISTEN) {
                sk->sk_max_ack_backlog = backlog;
                sk->sk_state           = TCP_LISTEN;

                return 0;
        }

        return -EOPNOTSUPP;
}

/*
 * Function irda_bind (sock, uaddr, addr_len)
 *
 *    Used by servers to register their well known TSAP
 *
 */
static int irda_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
        struct sock *sk = sock->sk;
        struct sockaddr_irda *addr = (struct sockaddr_irda *) uaddr;
        struct irda_sock *self = irda_sk(sk);
        int err;

        IRDA_ASSERT(self != NULL, return -1;);

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        if (addr_len != sizeof(struct sockaddr_irda))
                return -EINVAL;

#ifdef CONFIG_IRDA_ULTRA
        /* Special care for Ultra sockets */
        if ((sk->sk_type == SOCK_DGRAM) &&
            (sk->sk_protocol == IRDAPROTO_ULTRA)) {
                self->pid = addr->sir_lsap_sel;
                if (self->pid & 0x80) {
                        IRDA_DEBUG(0, "%s(), extension in PID not supp!\n", __FUNCTION__);
                        return -EOPNOTSUPP;
                }
                err = irda_open_lsap(self, self->pid);
                if (err < 0)
                        return err;

                /* Pretend we are connected */
                sock->state = SS_CONNECTED;
                sk->sk_state   = TCP_ESTABLISHED;

                return 0;
        }
#endif /* CONFIG_IRDA_ULTRA */

        err = irda_open_tsap(self, addr->sir_lsap_sel, addr->sir_name);
        if (err < 0)
                return err;

        /*  Register with LM-IAS */
        self->ias_obj = irias_new_object(addr->sir_name, jiffies);
        irias_add_integer_attrib(self->ias_obj, "IrDA:TinyTP:LsapSel",
                                 self->stsap_sel, IAS_KERNEL_ATTR);
        irias_insert_object(self->ias_obj);

        return 0;
}

/*
 * Function irda_accept (sock, newsock, flags)
 *
 *    Wait for incoming connection
 *
 */
static int irda_accept(struct socket *sock, struct socket *newsock, int flags)
{
        struct sock *sk = sock->sk;
        struct irda_sock *new, *self = irda_sk(sk);
        struct sock *newsk;
        struct sk_buff *skb;
        int err;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return -1;);

        err = irda_create(newsock, sk->sk_protocol);
        if (err)
                return err;

        if (sock->state != SS_UNCONNECTED)
                return -EINVAL;

        if ((sk = sock->sk) == NULL)
                return -EINVAL;

        if ((sk->sk_type != SOCK_STREAM) && (sk->sk_type != SOCK_SEQPACKET) &&
            (sk->sk_type != SOCK_DGRAM))
                return -EOPNOTSUPP;

        if (sk->sk_state != TCP_LISTEN)
                return -EINVAL;

        /*
         *      The read queue this time is holding sockets ready to use
         *      hooked into the SABM we saved
         */

        /*
         * We can perform the accept only if there is incoming data
         * on the listening socket.
         * So, we will block the caller until we receive any data.
         * If the caller was waiting on select() or poll() before
         * calling us, the data is waiting for us ;-)
         * Jean II
         */
        skb = skb_dequeue(&sk->sk_receive_queue);
        if (skb == NULL) {
                int ret = 0;
                DECLARE_WAITQUEUE(waitq, current);

                /* Non blocking operation */
                if (flags & O_NONBLOCK)
                        return -EWOULDBLOCK;

                /* The following code is a cut'n'paste of the
                 * wait_event_interruptible() macro.
                 * We don't us the macro because the condition has
                 * side effects : we want to make sure that only one
                 * skb get dequeued - Jean II */
                add_wait_queue(sk->sk_sleep, &waitq);
                for (;;) {
                        set_current_state(TASK_INTERRUPTIBLE);
                        skb = skb_dequeue(&sk->sk_receive_queue);
                        if (skb != NULL)
                                break;
                        if (!signal_pending(current)) {
                                schedule();
                                continue;
                        }
                        ret = -ERESTARTSYS;
                        break;
                }
                current->state = TASK_RUNNING;
                remove_wait_queue(sk->sk_sleep, &waitq);
                if(ret)
                        return -ERESTARTSYS;
        }

        newsk = newsock->sk;
        newsk->sk_state = TCP_ESTABLISHED;

        new = irda_sk(newsk);
        IRDA_ASSERT(new != NULL, return -1;);

        /* Now attach up the new socket */
        new->tsap = irttp_dup(self->tsap, new);
        if (!new->tsap) {
                IRDA_DEBUG(0, "%s(), dup failed!\n", __FUNCTION__);
                kfree_skb(skb);
                return -1;
        }

        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_sdu_size_tx = self->max_sdu_size_tx;
        new->max_sdu_size_rx = self->max_sdu_size_rx;
        new->max_data_size   = self->max_data_size;
        new->max_header_size = self->max_header_size;

        memcpy(&new->qos_tx, &self->qos_tx, sizeof(struct qos_info));

        /* Clean up the original one to keep it in listen state */
        irttp_listen(self->tsap);

        /* Wow ! What is that ? Jean II */
        skb->sk = NULL;
        skb->destructor = NULL;
        kfree_skb(skb);
        sk->sk_ack_backlog--;

        newsock->state = SS_CONNECTED;

        irda_connect_response(new);

        return 0;
}

/*
 * Function irda_connect (sock, uaddr, addr_len, flags)
 *
 *    Connect to a IrDA device
 *
 * The main difference with a "standard" connect is that with IrDA we need
 * to resolve the service name into a TSAP selector (in TCP, port number
 * doesn't have to be resolved).
 * Because of this service name resoltion, we can offer "auto-connect",
 * where we connect to a service without specifying a destination address.
 *
 * Note : by consulting "errno", the user space caller may learn the cause
 * of the failure. Most of them are visible in the function, others may come
 * from subroutines called and are listed here :
 *      o EBUSY : already processing a connect
 *      o EHOSTUNREACH : bad addr->sir_addr argument
 *      o EADDRNOTAVAIL : bad addr->sir_name argument
 *      o ENOTUNIQ : more than one node has addr->sir_name (auto-connect)
 *      o ENETUNREACH : no node found on the network (auto-connect)
 */
static int irda_connect(struct socket *sock, struct sockaddr *uaddr,
                        int addr_len, int flags)
{
        struct sock *sk = sock->sk;
        struct sockaddr_irda *addr = (struct sockaddr_irda *) uaddr;
        struct irda_sock *self = irda_sk(sk);
        int err;

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        /* Don't allow connect for Ultra sockets */
        if ((sk->sk_type == SOCK_DGRAM) && (sk->sk_protocol == IRDAPROTO_ULTRA))
                return -ESOCKTNOSUPPORT;

        if (sk->sk_state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
                sock->state = SS_CONNECTED;
                return 0;   /* Connect completed during a ERESTARTSYS event */
        }

        if (sk->sk_state == TCP_CLOSE && sock->state == SS_CONNECTING) {
                sock->state = SS_UNCONNECTED;
                return -ECONNREFUSED;
        }

        if (sk->sk_state == TCP_ESTABLISHED)
                return -EISCONN;      /* No reconnect on a seqpacket socket */

        sk->sk_state   = TCP_CLOSE;
        sock->state = SS_UNCONNECTED;

        if (addr_len != sizeof(struct sockaddr_irda))
                return -EINVAL;

        /* Check if user supplied any destination device address */
        if ((!addr->sir_addr) || (addr->sir_addr == DEV_ADDR_ANY)) {
                /* Try to find one suitable */
                err = irda_discover_daddr_and_lsap_sel(self, addr->sir_name);
                if (err) {
                        IRDA_DEBUG(0, "%s(), auto-connect failed!\n", __FUNCTION__);
                        return err;
                }
        } else {
                /* Use the one provided by the user */
                self->daddr = addr->sir_addr;
                IRDA_DEBUG(1, "%s(), daddr = %08x\n", __FUNCTION__, self->daddr);

                /* If we don't have a valid service name, we assume the
                 * user want to connect on a specific LSAP. Prevent
                 * the use of invalid LSAPs (IrLMP 1.1 p10). Jean II */
                if((addr->sir_name[0] != '\0') ||
                   (addr->sir_lsap_sel >= 0x70)) {
                        /* Query remote LM-IAS using service name */
                        err = irda_find_lsap_sel(self, addr->sir_name);
                        if (err) {
                                IRDA_DEBUG(0, "%s(), connect failed!\n", __FUNCTION__);
                                return err;
                        }
                } else {
                        /* Directly connect to the remote LSAP
                         * specified by the sir_lsap field.
                         * Please use with caution, in IrDA LSAPs are
                         * dynamic and there is no "well-known" LSAP. */
                        self->dtsap_sel = addr->sir_lsap_sel;
                }
        }

        /* Check if we have opened a local TSAP */
        if (!self->tsap)
                irda_open_tsap(self, LSAP_ANY, addr->sir_name);

        /* Move to connecting socket, start sending Connect Requests */
        sock->state = SS_CONNECTING;
        sk->sk_state   = TCP_SYN_SENT;

        /* Connect to remote device */
        err = irttp_connect_request(self->tsap, self->dtsap_sel,
                                    self->saddr, self->daddr, NULL,
                                    self->max_sdu_size_rx, NULL);
        if (err) {
                IRDA_DEBUG(0, "%s(), connect failed!\n", __FUNCTION__);
                return err;
        }

        /* Now the loop */
        if (sk->sk_state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
                return -EINPROGRESS;

        if (wait_event_interruptible(*(sk->sk_sleep),
                                     (sk->sk_state != TCP_SYN_SENT)))
                return -ERESTARTSYS;

        if (sk->sk_state != TCP_ESTABLISHED) {
                sock->state = SS_UNCONNECTED;
                return sock_error(sk);  /* Always set at this point */
        }

        sock->state = SS_CONNECTED;

        /* At this point, IrLMP has assigned our source address */
        self->saddr = irttp_get_saddr(self->tsap);

        return 0;
}

static struct proto irda_proto = {
        .name     = "IRDA",
        .owner    = THIS_MODULE,
        .obj_size = sizeof(struct irda_sock),
};

/*
 * Function irda_create (sock, protocol)
 *
 *    Create IrDA socket
 *
 */
static int irda_create(struct socket *sock, int protocol)
{
        struct sock *sk;
        struct irda_sock *self;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        /* Check for valid socket type */
        switch (sock->type) {
        case SOCK_STREAM:     /* For TTP connections with SAR disabled */
        case SOCK_SEQPACKET:  /* For TTP connections with SAR enabled */
        case SOCK_DGRAM:      /* For TTP Unitdata or LMP Ultra transfers */
                break;
        default:
                return -ESOCKTNOSUPPORT;
        }

        /* Allocate networking socket */
        sk = sk_alloc(PF_IRDA, GFP_ATOMIC, &irda_proto, 1);
        if (sk == NULL)
                return -ENOMEM;

        self = irda_sk(sk);
        IRDA_DEBUG(2, "%s() : self is %p\n", __FUNCTION__, self);

        init_waitqueue_head(&self->query_wait);

        /* Initialise networking socket struct */
        sock_init_data(sock, sk);       /* Note : set sk->sk_refcnt to 1 */
        sk->sk_family = PF_IRDA;
        sk->sk_protocol = protocol;

        switch (sock->type) {
        case SOCK_STREAM:
                sock->ops = &irda_stream_ops;
                self->max_sdu_size_rx = TTP_SAR_DISABLE;
                break;
        case SOCK_SEQPACKET:
                sock->ops = &irda_seqpacket_ops;
                self->max_sdu_size_rx = TTP_SAR_UNBOUND;
                break;
        case SOCK_DGRAM:
                switch (protocol) {
#ifdef CONFIG_IRDA_ULTRA
                case IRDAPROTO_ULTRA:
                        sock->ops = &irda_ultra_ops;
                        /* Initialise now, because we may send on unbound
                         * sockets. Jean II */
                        self->max_data_size = ULTRA_MAX_DATA - LMP_PID_HEADER;
                        self->max_header_size = IRDA_MAX_HEADER + LMP_PID_HEADER;
                        break;
#endif /* CONFIG_IRDA_ULTRA */
                case IRDAPROTO_UNITDATA:
                        sock->ops = &irda_dgram_ops;
                        /* We let Unitdata conn. be like seqpack conn. */
                        self->max_sdu_size_rx = TTP_SAR_UNBOUND;
                        break;
                default:
                        IRDA_ERROR("%s: protocol not supported!\n",
                                   __FUNCTION__);
                        return -ESOCKTNOSUPPORT;
                }
                break;
        default:
                return -ESOCKTNOSUPPORT;
        }

        /* Register as a client with IrLMP */
        self->ckey = irlmp_register_client(0, NULL, NULL, NULL);
        self->mask.word = 0xffff;
        self->rx_flow = self->tx_flow = FLOW_START;
        self->nslots = DISCOVERY_DEFAULT_SLOTS;
        self->daddr = DEV_ADDR_ANY;     /* Until we get connected */
        self->saddr = 0x0;              /* so IrLMP assign us any link */
        return 0;
}

/*
 * Function irda_destroy_socket (self)
 *
 *    Destroy socket
 *
 */
static void irda_destroy_socket(struct irda_sock *self)
{
        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        IRDA_ASSERT(self != NULL, return;);

        /* Unregister with IrLMP */
        irlmp_unregister_client(self->ckey);
        irlmp_unregister_service(self->skey);

        /* Unregister with LM-IAS */
        if (self->ias_obj) {
                irias_delete_object(self->ias_obj);
                self->ias_obj = NULL;
        }

        if (self->iriap) {
                iriap_close(self->iriap);
                self->iriap = NULL;
        }

        if (self->tsap) {
                irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
                irttp_close_tsap(self->tsap);
                self->tsap = NULL;
        }
#ifdef CONFIG_IRDA_ULTRA
        if (self->lsap) {
                irlmp_close_lsap(self->lsap);
                self->lsap = NULL;
        }
#endif /* CONFIG_IRDA_ULTRA */
}

/*
 * Function irda_release (sock)
 */
static int irda_release(struct socket *sock)
{
        struct sock *sk = sock->sk;

        IRDA_DEBUG(2, "%s()\n", __FUNCTION__);

        if (sk == NULL)
                return 0;

        sk->sk_state       = TCP_CLOSE;
        sk->sk_shutdown   |= SEND_SHUTDOWN;
        sk->sk_state_change(sk);

        /* Destroy IrDA socket */
        irda_destroy_socket(irda_sk(sk));

        sock_orphan(sk);
        sock->sk   = NULL;

        /* Purge queues (see sock_init_data()) */
        skb_queue_purge(&sk->sk_receive_queue);

        /* Destroy networking socket if we are the last reference on it,
         * i.e. if(sk->sk_refcnt == 0) -> sk_free(sk) */
        sock_put(sk);

        /* Notes on socket locking and deallocation... - Jean II
         * In theory we should put pairs of sock_hold() / sock_put() to
         * prevent the socket to be destroyed whenever there is an
         * outstanding request or outstanding incoming packet or event.
         *
         * 1) This may include IAS request, both in connect and getsockopt.
         * Unfortunately, the situation is a bit more messy than it looks,
         * because we close iriap and kfree(self) above.
         *
         * 2) This may include selective discovery in getsockopt.
         * Same stuff as above, irlmp registration and self are gone.
         *
         * Probably 1 and 2 may not matter, because it's all triggered
         * by a process and the socket layer already prevent the
         * socket to go away while a process is holding it, through
         * sockfd_put() and fput()...
         *
         * 3) This may include deferred TSAP closure. In particular,
         * we may receive a late irda_disconnect_indication()
         * Fortunately, (tsap_cb *)->close_pend should protect us
         * from that.
         *
         * I did some testing on SMP, and it looks solid. And the socket
         * memory leak is now gone... - Jean II
         */

        return 0;
}

/*
 * Function irda_sendmsg (iocb, sock, msg, len)
 *
 *    Send message down to TinyTP. This function is used for both STREAM and
 *    SEQPACK services. This is possible since it forces the client to
 *    fragment the message if necessary
 */
static int irda_sendmsg(struct kiocb *iocb, struct socket *sock,
                        struct msghdr *msg, size_t len)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self;
        struct sk_buff *skb;
        unsigned char *asmptr;
        int err;

        IRDA_DEBUG(4, "%s(), len=%zd\n", __FUNCTION__, len);

        /* Note : socket.c set MSG_EOR on SEQPACKET sockets */
        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_CMSG_COMPAT))
                return -EINVAL;

        if (sk->sk_shutdown & SEND_SHUTDOWN) {
                send_sig(SIGPIPE, current, 0);
                return -EPIPE;
        }

        if (sk->sk_state != TCP_ESTABLISHED)
                return -ENOTCONN;

        self = irda_sk(sk);
        IRDA_ASSERT(self != NULL, return -1;);

        /* Check if IrTTP is wants us to slow down */

        if (wait_event_interruptible(*(sk->sk_sleep),
            (self->tx_flow != FLOW_STOP  ||  sk->sk_state != TCP_ESTABLISHED)))
                return -ERESTARTSYS;

        /* Check if we are still connected */
        if (sk->sk_state != TCP_ESTABLISHED)
                return -ENOTCONN;

        /* Check that we don't send out to big frames */
        if (len > self->max_data_size) {
                IRDA_DEBUG(2, "%s(), Chopping frame from %zd to %d bytes!\n",
                           __FUNCTION__, len, self->max_data_size);
                len = self->max_data_size;
        }

        skb = sock_alloc_send_skb(sk, len + self->max_header_size + 16, 
                                  msg->msg_flags & MSG_DONTWAIT, &err);
        if (!skb)
                return -ENOBUFS;

        skb_reserve(skb, self->max_header_size + 16);

        asmptr = skb->h.raw = skb_put(skb, len);
        err = memcpy_fromiovec(asmptr, msg->msg_iov, len);
        if (err) {
                kfree_skb(skb);
                return err;
        }

        /*
         * Just send the message to TinyTP, and let it deal with possible
         * errors. No need to duplicate all that here
         */
        err = irttp_data_request(self->tsap, skb);
        if (err) {
                IRDA_DEBUG(0, "%s(), err=%d\n", __FUNCTION__, err);
                return err;
        }
        /* Tell client how much data we actually sent */
        return len;
}

/*
 * Function irda_recvmsg_dgram (iocb, sock, msg, size, flags)
 *
 *    Try to receive message and copy it to user. The frame is discarded
 *    after being read, regardless of how much the user actually read
 */
static int irda_recvmsg_dgram(struct kiocb *iocb, struct socket *sock,
                              struct msghdr *msg, size_t size, int flags)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);
        struct sk_buff *skb;
        size_t copied;
        int err;

        IRDA_DEBUG(4, "%s()\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return -1;);

        skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
                                flags & MSG_DONTWAIT, &err);
        if (!skb)
                return err;

        skb->h.raw = skb->data;
        copied     = skb->len;

        if (copied > size) {
                IRDA_DEBUG(2, "%s(), Received truncated frame (%zd < %zd)!\n",
                           __FUNCTION__, copied, size);
                copied = size;
                msg->msg_flags |= MSG_TRUNC;
        }
        skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);

        skb_free_datagram(sk, skb);

        /*
         *  Check if we have previously stopped IrTTP and we know
         *  have more free space in our rx_queue. If so tell IrTTP
         *  to start delivering frames again before our rx_queue gets
         *  empty
         */
        if (self->rx_flow == FLOW_STOP) {
                if ((atomic_read(&sk->sk_rmem_alloc) << 2) <= sk->sk_rcvbuf) {
                        IRDA_DEBUG(2, "%s(), Starting IrTTP\n", __FUNCTION__);
                        self->rx_flow = FLOW_START;
                        irttp_flow_request(self->tsap, FLOW_START);
                }
        }

        return copied;
}

/*
 * Function irda_recvmsg_stream (iocb, sock, msg, size, flags)
 */
static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
                               struct msghdr *msg, size_t size, int flags)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);
        int noblock = flags & MSG_DONTWAIT;
        size_t copied = 0;
        int target = 1;
        DECLARE_WAITQUEUE(waitq, current);

        IRDA_DEBUG(3, "%s()\n", __FUNCTION__);

        IRDA_ASSERT(self != NULL, return -1;);

        if (sock->flags & __SO_ACCEPTCON)
                return(-EINVAL);

        if (flags & MSG_OOB)
                return -EOPNOTSUPP;

        if (flags & MSG_WAITALL)
                target = size;

        msg->msg_namelen = 0;

        do {
                int chunk;
                struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);

                if (skb==NULL) {
                        int ret = 0;

                        if (copied >= target)
                                break;

                        /* The following code is a cut'n'paste of the
                         * wait_event_interruptible() macro.
                         * We don't us the macro because the test condition
                         * is messy. - Jean II */
                        set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
                        add_wait_queue(sk->sk_sleep, &waitq);
                        set_current_state(TASK_INTERRUPTIBLE);

                        /*
                         *      POSIX 1003.1g mandates this order.
                         */
                        if (sk->sk_err)
                                ret = sock_error(sk);
                        else if (sk->sk_shutdown & RCV_SHUTDOWN)
                                ;
                        else if (noblock)
                                ret = -EAGAIN;
                        else if (signal_pending(current))
                                ret = -ERESTARTSYS;
                        else if (skb_peek(&sk->sk_receive_queue) == NULL)
                                /* Wait process until data arrives */
                                schedule();

                        current->state = TASK_RUNNING;
                        remove_wait_queue(sk->sk_sleep, &waitq);
                        clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);

                        if(ret)
                                return(ret);
                        if (sk->sk_shutdown & RCV_SHUTDOWN)
                                break;

                        continue;
                }

                chunk = min_t(unsigned int, skb->len, size);
                if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
                        skb_queue_head(&sk->sk_receive_queue, skb);
                        if (copied == 0)
                                copied = -EFAULT;
                        break;
                }
                copied += chunk;
                size -= chunk;

                /* Mark read part of skb as used */
                if (!(flags & MSG_PEEK)) {
                        skb_pull(skb, chunk);

                        /* put the skb back if we didn't use it up.. */
                        if (skb->len) {
                                IRDA_DEBUG(1, "%s(), back on q!\n",
                                           __FUNCTION__);
                                skb_queue_head(&sk->sk_receive_queue, skb);
                                break;
                        }

                        kfree_skb(skb);
                } else {
                        IRDA_DEBUG(0, "%s() questionable!?\n", __FUNCTION__);

                        /* put message back and return */
                        skb_queue_head(&sk->sk_receive_queue, skb);
                        break;
                }
        } while (size);

        /*
         *  Check if we have previously stopped IrTTP and we know
         *  have more free space in our rx_queue. If so tell IrTTP
         *  to start delivering frames again before our rx_queue gets
         *  empty
         */
        if (self->rx_flow == FLOW_STOP) {
                if ((atomic_read(&sk->sk_rmem_alloc) << 2) <= sk->sk_rcvbuf) {
                        IRDA_DEBUG(2, "%s(), Starting IrTTP\n", __FUNCTION__);
                        self->rx_flow = FLOW_START;
                        irttp_flow_request(self->tsap, FLOW_START);
                }
        }

        return copied;
}

/*
 * Function irda_sendmsg_dgram (iocb, sock, msg, len)
 *
 *    Send message down to TinyTP for the unreliable sequenced
 *    packet service...
 *
 */
static int irda_sendmsg_dgram(struct kiocb *iocb, struct socket *sock,
                              struct msghdr *msg, size_t len)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self;
        struct sk_buff *skb;
        unsigned char *asmptr;
        int err;

        IRDA_DEBUG(4, "%s(), len=%zd\n", __FUNCTION__, len);

        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
                return -EINVAL;

        if (sk->sk_shutdown & SEND_SHUTDOWN) {
                send_sig(SIGPIPE, current, 0);
                return -EPIPE;
        }

        if (sk->sk_state != TCP_ESTABLISHED)
                return -ENOTCONN;

        self = irda_sk(sk);
        IRDA_ASSERT(self != NULL, return -1;);

        /*
         * Check that we don't send out to big frames. This is an unreliable
         * service, so we have no fragmentation and no coalescence
         */
        if (len > self->max_data_size) {
                IRDA_DEBUG(0, "%s(), Warning to much data! "
                           "Chopping frame from %zd to %d bytes!\n",
                           __FUNCTION__, len, self->max_data_size);
                len = self->max_data_size;
        }

        skb = sock_alloc_send_skb(sk, len + self->max_header_size,
                                  msg->msg_flags & MSG_DONTWAIT, &err);
        if (!skb)
                return -ENOBUFS;

        skb_reserve(skb, self->max_header_size);

        IRDA_DEBUG(4, "%s(), appending user data\n", __FUNCTION__);
        asmptr = skb->h.raw = skb_put(skb, len);
        err = memcpy_fromiovec(asmptr, msg->msg_iov, len);
        if (err) {
                kfree_skb(skb);
                return err;
        }

        /*
         * Just send the message to TinyTP, and let it deal with possible
         * errors. No need to duplicate all that here
         */
        err = irttp_udata_request(self->tsap, skb);
        if (err) {
                IRDA_DEBUG(0, "%s(), err=%d\n", __FUNCTION__, err);
                return err;
        }
        return len;
}

/*
 * Function irda_sendmsg_ultra (iocb, sock, msg, len)
 *
 *    Send message down to IrLMP for the unreliable Ultra
 *    packet service...
 */
#ifdef CONFIG_IRDA_ULTRA
static int irda_sendmsg_ultra(struct kiocb *iocb, struct socket *sock,
                              struct msghdr *msg, size_t len)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self;
        __u8 pid = 0;
        int bound = 0;
        struct sk_buff *skb;
        unsigned char *asmptr;
        int err;

        IRDA_DEBUG(4, "%s(), len=%zd\n", __FUNCTION__, len);

        if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
                return -EINVAL;

        if (sk->sk_shutdown & SEND_SHUTDOWN) {
                send_sig(SIGPIPE, current, 0);
                return -EPIPE;
        }

        self = irda_sk(sk);
        IRDA_ASSERT(self != NULL, return -1;);

        /* Check if an address was specified with sendto. Jean II */
        if (msg->msg_name) {
                struct sockaddr_irda *addr = (struct sockaddr_irda *) msg->msg_name;
                /* Check address, extract pid. Jean II */
                if (msg->msg_namelen < sizeof(*addr))
                        return -EINVAL;
                if (addr->sir_family != AF_IRDA)
                        return -EINVAL;

                pid = addr->sir_lsap_sel;
                if (pid & 0x80) {
                        IRDA_DEBUG(0, "%s(), extension in PID not supp!\n", __FUNCTION__);
                        return -EOPNOTSUPP;
                }
        } else {
                /* Check that the socket is properly bound to an Ultra
                 * port. Jean II */
                if ((self->lsap == NULL) ||
                    (sk->sk_state != TCP_ESTABLISHED)) {
                        IRDA_DEBUG(0, "%s(), socket not bound to Ultra PID.\n",
                                   __FUNCTION__);
                        return -ENOTCONN;
                }
                /* Use PID from socket */
                bound = 1;
        }

        /*
         * Check that we don't send out to big frames. This is an unreliable
         * service, so we have no fragmentation and no coalescence
         */
        if (len > self->max_data_size) {
                IRDA_DEBUG(0, "%s(), Warning to much data! "
                           "Chopping frame from %zd to %d bytes!\n",
                           __FUNCTION__, len, self->max_data_size);
                len = self->max_data_size;
        }

        skb = sock_alloc_send_skb(sk, len + self->max_header_size,
                                  msg->msg_flags & MSG_DONTWAIT, &err);
        if (!skb)
                return -ENOBUFS;

        skb_reserve(skb, self->max_header_size);

        IRDA_DEBUG(4, "%s(), appending user data\n", __FUNCTION__);
        asmptr = skb->h.raw = skb_put(skb, len);
        err = memcpy_fromiovec(asmptr, msg->msg_iov, len);
        if (err) {
                kfree_skb(skb);
                return err;
        }

        err = irlmp_connless_data_request((bound ? self->lsap : NULL),
                                          skb, pid);
        if (err) {
                IRDA_DEBUG(0, "%s(), err=%d\n", __FUNCTION__, err);
                return err;
        }
        return len;
}
#endif /* CONFIG_IRDA_ULTRA */

/*
 * Function irda_shutdown (sk, how)
 */
static int irda_shutdown(struct socket *sock, int how)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);

        IRDA_ASSERT(self != NULL, return -1;);

        IRDA_DEBUG(1, "%s(%p)\n", __FUNCTION__, self);

        sk->sk_state       = TCP_CLOSE;
        sk->sk_shutdown   |= SEND_SHUTDOWN;
        sk->sk_state_change(sk);

        if (self->iriap) {
                iriap_close(self->iriap);
                self->iriap = NULL;
        }

        if (self->tsap) {
                irttp_disconnect_request(self->tsap, NULL, P_NORMAL);
                irttp_close_tsap(self->tsap);
                self->tsap = NULL;
        }

        /* A few cleanup so the socket look as good as new... */
        self->rx_flow = self->tx_flow = FLOW_START;     /* needed ??? */
        self->daddr = DEV_ADDR_ANY;     /* Until we get re-connected */
        self->saddr = 0x0;              /* so IrLMP assign us any link */

        return 0;
}

/*
 * Function irda_poll (file, sock, wait)
 */
static unsigned int irda_poll(struct file * file, struct socket *sock,
                              poll_table *wait)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);
        unsigned int mask;

        IRDA_DEBUG(4, "%s()\n", __FUNCTION__);

        poll_wait(file, sk->sk_sleep, wait);
        mask = 0;

        /* Exceptional events? */
        if (sk->sk_err)
                mask |= POLLERR;
        if (sk->sk_shutdown & RCV_SHUTDOWN) {
                IRDA_DEBUG(0, "%s(), POLLHUP\n", __FUNCTION__);
                mask |= POLLHUP;
        }

        /* Readable? */
        if (!skb_queue_empty(&sk->sk_receive_queue)) {
                IRDA_DEBUG(4, "Socket is readable\n");
                mask |= POLLIN | POLLRDNORM;
        }

        /* Connection-based need to check for termination and startup */
        switch (sk->sk_type) {
        case SOCK_STREAM:
                if (sk->sk_state == TCP_CLOSE) {
                        IRDA_DEBUG(0, "%s(), POLLHUP\n", __FUNCTION__);
                        mask |= POLLHUP;
                }

                if (sk->sk_state == TCP_ESTABLISHED) {
                        if ((self->tx_flow == FLOW_START) &&
                            sock_writeable(sk))
                        {
                                mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
                        }
                }
                break;
        case SOCK_SEQPACKET:
                if ((self->tx_flow == FLOW_START) &&
                    sock_writeable(sk))
                {
                        mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
                }
                break;
        case SOCK_DGRAM:
                if (sock_writeable(sk))
                        mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
                break;
        default:
                break;
        }
        return mask;
}

/*
 * Function irda_ioctl (sock, cmd, arg)
 */
static int irda_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
        struct sock *sk = sock->sk;

        IRDA_DEBUG(4, "%s(), cmd=%#x\n", __FUNCTION__, cmd);

        switch (cmd) {
        case TIOCOUTQ: {
                long amount;
                amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
                if (amount < 0)
                        amount = 0;
                if (put_user(amount, (unsigned int __user *)arg))
                        return -EFAULT;
                return 0;
        }

        case TIOCINQ: {
                struct sk_buff *skb;
                long amount = 0L;
                /* These two are safe on a single CPU system as only user tasks fiddle here */
                if ((skb = skb_peek(&sk->sk_receive_queue)) != NULL)
                        amount = skb->len;
                if (put_user(amount, (unsigned int __user *)arg))
                        return -EFAULT;
                return 0;
        }

        case SIOCGSTAMP:
                if (sk != NULL)
                        return sock_get_timestamp(sk, (struct timeval __user *)arg);
                return -EINVAL;

        case SIOCGIFADDR:
        case SIOCSIFADDR:
        case SIOCGIFDSTADDR:
        case SIOCSIFDSTADDR:
        case SIOCGIFBRDADDR:
        case SIOCSIFBRDADDR:
        case SIOCGIFNETMASK:
        case SIOCSIFNETMASK:
        case SIOCGIFMETRIC:
        case SIOCSIFMETRIC:
                return -EINVAL;
        default:
                IRDA_DEBUG(1, "%s(), doing device ioctl!\n", __FUNCTION__);
                return dev_ioctl(cmd, (void __user *) arg);
        }

        /*NOTREACHED*/
        return 0;
}

/*
 * Function irda_setsockopt (sock, level, optname, optval, optlen)
 *
 *    Set some options for the socket
 *
 */
static int irda_setsockopt(struct socket *sock, int level, int optname,
                           char __user *optval, int optlen)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);
        struct irda_ias_set    *ias_opt;
        struct ias_object      *ias_obj;
        struct ias_attrib *     ias_attr;       /* Attribute in IAS object */
        int opt;

        IRDA_ASSERT(self != NULL, return -1;);

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        if (level != SOL_IRLMP)
                return -ENOPROTOOPT;

        switch (optname) {
        case IRLMP_IAS_SET:
                /* The user want to add an attribute to an existing IAS object
                 * (in the IAS database) or to create a new object with this
                 * attribute.
                 * We first query IAS to know if the object exist, and then
                 * create the right attribute...
                 */

                if (optlen != sizeof(struct irda_ias_set))
                        return -EINVAL;

                ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
                if (ias_opt == NULL)
                        return -ENOMEM;

                /* Copy query to the driver. */
                if (copy_from_user(ias_opt, optval, optlen)) {
                        kfree(ias_opt);
                        return -EFAULT;
                }

                /* Find the object we target.
                 * If the user gives us an empty string, we use the object
                 * associated with this socket. This will workaround
                 * duplicated class name - Jean II */
                if(ias_opt->irda_class_name[0] == '\0') {
                        if(self->ias_obj == NULL) {
                                kfree(ias_opt);
                                return -EINVAL;
                        }
                        ias_obj = self->ias_obj;
                } else
                        ias_obj = irias_find_object(ias_opt->irda_class_name);

                /* Only ROOT can mess with the global IAS database.
                 * Users can only add attributes to the object associated
                 * with the socket they own - Jean II */
                if((!capable(CAP_NET_ADMIN)) &&
                   ((ias_obj == NULL) || (ias_obj != self->ias_obj))) {
                        kfree(ias_opt);
                        return -EPERM;
                }

                /* If the object doesn't exist, create it */
                if(ias_obj == (struct ias_object *) NULL) {
                        /* Create a new object */
                        ias_obj = irias_new_object(ias_opt->irda_class_name,
                                                   jiffies);
                }

                /* Do we have the attribute already ? */
                if(irias_find_attrib(ias_obj, ias_opt->irda_attrib_name)) {
                        kfree(ias_opt);
                        return -EINVAL;
                }

                /* Look at the type */
                switch(ias_opt->irda_attrib_type) {
                case IAS_INTEGER:
                        /* Add an integer attribute */
                        irias_add_integer_attrib(
                                ias_obj,
                                ias_opt->irda_attrib_name,
                                ias_opt->attribute.irda_attrib_int,
                                IAS_USER_ATTR);
                        break;
                case IAS_OCT_SEQ:
                        /* Check length */
                        if(ias_opt->attribute.irda_attrib_octet_seq.len >
                           IAS_MAX_OCTET_STRING) {
                                kfree(ias_opt);
                                return -EINVAL;
                        }
                        /* Add an octet sequence attribute */
                        irias_add_octseq_attrib(
                              ias_obj,
                              ias_opt->irda_attrib_name,
                              ias_opt->attribute.irda_attrib_octet_seq.octet_seq,
                              ias_opt->attribute.irda_attrib_octet_seq.len,
                              IAS_USER_ATTR);
                        break;
                case IAS_STRING:
                        /* Should check charset & co */
                        /* Check length */
                        /* The length is encoded in a __u8, and
                         * IAS_MAX_STRING == 256, so there is no way
                         * userspace can pass us a string too large.
                         * Jean II */
                        /* NULL terminate the string (avoid troubles) */
                        ias_opt->attribute.irda_attrib_string.string[ias_opt->attribute.irda_attrib_string.len] = '\0';
                        /* Add a string attribute */
                        irias_add_string_attrib(
                                ias_obj,
                                ias_opt->irda_attrib_name,
                                ias_opt->attribute.irda_attrib_string.string,
                                IAS_USER_ATTR);
                        break;
                default :
                        kfree(ias_opt);
                        return -EINVAL;
                }
                irias_insert_object(ias_obj);
                kfree(ias_opt);
                break;
        case IRLMP_IAS_DEL:
                /* The user want to delete an object from our local IAS
                 * database. We just need to query the IAS, check is the
                 * object is not owned by the kernel and delete it.
                 */

                if (optlen != sizeof(struct irda_ias_set))
                        return -EINVAL;

                ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
                if (ias_opt == NULL)
                        return -ENOMEM;

                /* Copy query to the driver. */
                if (copy_from_user(ias_opt, optval, optlen)) {
                        kfree(ias_opt);
                        return -EFAULT;
                }

                /* Find the object we target.
                 * If the user gives us an empty string, we use the object
                 * associated with this socket. This will workaround
                 * duplicated class name - Jean II */
                if(ias_opt->irda_class_name[0] == '\0')
                        ias_obj = self->ias_obj;
                else
                        ias_obj = irias_find_object(ias_opt->irda_class_name);
                if(ias_obj == (struct ias_object *) NULL) {
                        kfree(ias_opt);
                        return -EINVAL;
                }

                /* Only ROOT can mess with the global IAS database.
                 * Users can only del attributes from the object associated
                 * with the socket they own - Jean II */
                if((!capable(CAP_NET_ADMIN)) &&
                   ((ias_obj == NULL) || (ias_obj != self->ias_obj))) {
                        kfree(ias_opt);
                        return -EPERM;
                }

                /* Find the attribute (in the object) we target */
                ias_attr = irias_find_attrib(ias_obj,
                                             ias_opt->irda_attrib_name);
                if(ias_attr == (struct ias_attrib *) NULL) {
                        kfree(ias_opt);
                        return -EINVAL;
                }

                /* Check is the user space own the object */
                if(ias_attr->value->owner != IAS_USER_ATTR) {
                        IRDA_DEBUG(1, "%s(), attempting to delete a kernel attribute\n", __FUNCTION__);
                        kfree(ias_opt);
                        return -EPERM;
                }

                /* Remove the attribute (and maybe the object) */
                irias_delete_attrib(ias_obj, ias_attr, 1);
                kfree(ias_opt);
                break;
        case IRLMP_MAX_SDU_SIZE:
                if (optlen < sizeof(int))
                        return -EINVAL;

                if (get_user(opt, (int __user *)optval))
                        return -EFAULT;

                /* Only possible for a seqpacket service (TTP with SAR) */
                if (sk->sk_type != SOCK_SEQPACKET) {
                        IRDA_DEBUG(2, "%s(), setting max_sdu_size = %d\n",
                                   __FUNCTION__, opt);
                        self->max_sdu_size_rx = opt;
                } else {
                        IRDA_WARNING("%s: not allowed to set MAXSDUSIZE for this socket type!\n",
                                     __FUNCTION__);
                        return -ENOPROTOOPT;
                }
                break;
        case IRLMP_HINTS_SET:
                if (optlen < sizeof(int))
                        return -EINVAL;

                /* The input is really a (__u8 hints[2]), easier as an int */
                if (get_user(opt, (int __user *)optval))
                        return -EFAULT;

                /* Unregister any old registration */
                if (self->skey)
                        irlmp_unregister_service(self->skey);

                self->skey = irlmp_register_service((__u16) opt);
                break;
        case IRLMP_HINT_MASK_SET:
                /* As opposed to the previous case which set the hint bits
                 * that we advertise, this one set the filter we use when
                 * making a discovery (nodes which don't match any hint
                 * bit in the mask are not reported).
                 */
                if (optlen < sizeof(int))
                        return -EINVAL;

                /* The input is really a (__u8 hints[2]), easier as an int */
                if (get_user(opt, (int __user *)optval))
                        return -EFAULT;

                /* Set the new hint mask */
                self->mask.word = (__u16) opt;
                /* Mask out extension bits */
                self->mask.word &= 0x7f7f;
                /* Check if no bits */
                if(!self->mask.word)
                        self->mask.word = 0xFFFF;

                break;
        default:
                return -ENOPROTOOPT;
        }
        return 0;
}

/*
 * Function irda_extract_ias_value(ias_opt, ias_value)
 *
 *    Translate internal IAS value structure to the user space representation
 *
 * The external representation of IAS values, as we exchange them with
 * user space program is quite different from the internal representation,
 * as stored in the IAS database (because we need a flat structure for
 * crossing kernel boundary).
 * This function transform the former in the latter. We also check
 * that the value type is valid.
 */
static int irda_extract_ias_value(struct irda_ias_set *ias_opt,
                                  struct ias_value *ias_value)
{
        /* Look at the type */
        switch (ias_value->type) {
        case IAS_INTEGER:
                /* Copy the integer */
                ias_opt->attribute.irda_attrib_int = ias_value->t.integer;
                break;
        case IAS_OCT_SEQ:
                /* Set length */
                ias_opt->attribute.irda_attrib_octet_seq.len = ias_value->len;
                /* Copy over */
                memcpy(ias_opt->attribute.irda_attrib_octet_seq.octet_seq,
                       ias_value->t.oct_seq, ias_value->len);
                break;
        case IAS_STRING:
                /* Set length */
                ias_opt->attribute.irda_attrib_string.len = ias_value->len;
                ias_opt->attribute.irda_attrib_string.charset = ias_value->charset;
                /* Copy over */
                memcpy(ias_opt->attribute.irda_attrib_string.string,
                       ias_value->t.string, ias_value->len);
                /* NULL terminate the string (avoid troubles) */
                ias_opt->attribute.irda_attrib_string.string[ias_value->len] = '\0';
                break;
        case IAS_MISSING:
        default :
                return -EINVAL;
        }

        /* Copy type over */
        ias_opt->irda_attrib_type = ias_value->type;

        return 0;
}

/*
 * Function irda_getsockopt (sock, level, optname, optval, optlen)
 */
static int irda_getsockopt(struct socket *sock, int level, int optname,
                           char __user *optval, int __user *optlen)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self = irda_sk(sk);
        struct irda_device_list list;
        struct irda_device_info *discoveries;
        struct irda_ias_set *   ias_opt;        /* IAS get/query params */
        struct ias_object *     ias_obj;        /* Object in IAS */
        struct ias_attrib *     ias_attr;       /* Attribute in IAS object */
        int daddr = DEV_ADDR_ANY;       /* Dest address for IAS queries */
        int val = 0;
        int len = 0;
        int err;
        int offset, total;

        IRDA_DEBUG(2, "%s(%p)\n", __FUNCTION__, self);

        if (level != SOL_IRLMP)
                return -ENOPROTOOPT;

        if (get_user(len, optlen))
                return -EFAULT;

        if(len < 0)
                return -EINVAL;

        switch (optname) {
        case IRLMP_ENUMDEVICES:
                /* Ask lmp for the current discovery log */
                discoveries = irlmp_get_discoveries(&list.len, self->mask.word,
                                                    self->nslots);
                /* Check if the we got some results */
                if (discoveries == NULL)
                        return -EAGAIN;         /* Didn't find any devices */
                err = 0;

                /* Write total list length back to client */
                if (copy_to_user(optval, &list,
                                 sizeof(struct irda_device_list) -
                                 sizeof(struct irda_device_info)))
                        err = -EFAULT;

                /* Offset to first device entry */
                offset = sizeof(struct irda_device_list) -
                        sizeof(struct irda_device_info);

                /* Copy the list itself - watch for overflow */
                if(list.len > 2048)
                {
                        err = -EINVAL;
                        goto bed;
                }
                total = offset + (list.len * sizeof(struct irda_device_info));
                if (total > len)
                        total = len;
                if (copy_to_user(optval+offset, discoveries, total - offset))
                        err = -EFAULT;

                /* Write total number of bytes used back to client */
                if (put_user(total, optlen))
                        err = -EFAULT;
bed:
                /* Free up our buffer */
                kfree(discoveries);
                if (err)
                        return err;
                break;
        case IRLMP_MAX_SDU_SIZE:
                val = self->max_data_size;
                len = sizeof(int);
                if (put_user(len, optlen))
                        return -EFAULT;

                if (copy_to_user(optval, &val, len))
                        return -EFAULT;
                break;
        case IRLMP_IAS_GET:
                /* The user want an object from our local IAS database.
                 * We just need to query the IAS and return the value
                 * that we found */

                /* Check that the user has allocated the right space for us */
                if (len != sizeof(struct irda_ias_set))
                        return -EINVAL;

                ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
                if (ias_opt == NULL)
                        return -ENOMEM;

                /* Copy query to the driver. */
                if (copy_from_user(ias_opt, optval, len)) {
                        kfree(ias_opt);
                        return -EFAULT;
                }

                /* Find the object we target.
                 * If the user gives us an empty string, we use the object
                 * associated with this socket. This will workaround
                 * duplicated class name - Jean II */
                if(ias_opt->irda_class_name[0] == '\0')
                        ias_obj = self->ias_obj;
                else
                        ias_obj = irias_find_object(ias_opt->irda_class_name);
                if(ias_obj == (struct ias_object *) NULL) {
                        kfree(ias_opt);
                        return -EINVAL;
                }

                /* Find the attribute (in the object) we target */
                ias_attr = irias_find_attrib(ias_obj,
                                             ias_opt->irda_attrib_name);
                if(ias_attr == (struct ias_attrib *) NULL) {
                        kfree(ias_opt);
                        return -EINVAL;
                }

                /* Translate from internal to user structure */
                err = irda_extract_ias_value(ias_opt, ias_attr->value);
                if(err) {
                        kfree(ias_opt);
                        return err;
                }

                /* Copy reply to the user */
                if (copy_to_user(optval, ias_opt,
                                 sizeof(struct irda_ias_set))) {
                        kfree(ias_opt);
                        return -EFAULT;
                }
                /* Note : don't need to put optlen, we checked it */
                kfree(ias_opt);
                break;
        case IRLMP_IAS_QUERY:
                /* The user want an object from a remote IAS database.
                 * We need to use IAP to query the remote database and
                 * then wait for the answer to come back. */

                /* Check that the user has allocated the right space for us */
                if (len != sizeof(struct irda_ias_set))
                        return -EINVAL;

                ias_opt = kmalloc(sizeof(struct irda_ias_set), GFP_ATOMIC);
                if (ias_opt == NULL)
                        return -ENOMEM;

                /* Copy query to the driver. */
                if (copy_from_user(ias_opt, optval, len)) {
                        kfree(ias_opt);
                        return -EFAULT;
                }

                /* At this point, there are two cases...
                 * 1) the socket is connected - that's the easy case, we
                 *      just query the device we are connected to...
                 * 2) the socket is not connected - the user doesn't want
                 *      to connect and/or may not have a valid service name
                 *      (so can't create a fake connection). In this case,
                 *      we assume that the user pass us a valid destination
                 *      address in the requesting structure...
                 */
                if(self->daddr != DEV_ADDR_ANY) {
                        /* We are connected - reuse known daddr */
                        daddr = self->daddr;
                } else {
                        /* We are not connected, we must specify a valid
                         * destination address */
                        daddr = ias_opt->daddr;
                        if((!daddr) || (daddr == DEV_ADDR_ANY)) {
                                kfree(ias_opt);
                                return -EINVAL;
                        }
                }

                /* Check that we can proceed with IAP */
                if (self->iriap) {
                        IRDA_WARNING("%s: busy with a previous query\n",
                                     __FUNCTION__);
                        kfree(ias_opt);
                        return -EBUSY;
                }

                self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
                                         irda_getvalue_confirm);

                if (self->iriap == NULL) {
                        kfree(ias_opt);
                        return -ENOMEM;
                }

                /* Treat unexpected wakeup as disconnect */
                self->errno = -EHOSTUNREACH;

                /* Query remote LM-IAS */
                iriap_getvaluebyclass_request(self->iriap,
                                              self->saddr, daddr,
                                              ias_opt->irda_class_name,
                                              ias_opt->irda_attrib_name);

                /* Wait for answer, if not yet finished (or failed) */
                if (wait_event_interruptible(self->query_wait,
                                             (self->iriap == NULL))) {
                        /* pending request uses copy of ias_opt-content
                         * we can free it regardless! */
                        kfree(ias_opt);
                        /* Treat signals as disconnect */
                        return -EHOSTUNREACH;
                }

                /* Check what happened */
                if (self->errno)
                {
                        kfree(ias_opt);
                        /* Requested object/attribute doesn't exist */
                        if((self->errno == IAS_CLASS_UNKNOWN) ||
                           (self->errno == IAS_ATTRIB_UNKNOWN))
                                return (-EADDRNOTAVAIL);
                        else
                                return (-EHOSTUNREACH);
                }

                /* Translate from internal to user structure */
                err = irda_extract_ias_value(ias_opt, self->ias_result);
                if (self->ias_result)
                        irias_delete_value(self->ias_result);
                if (err) {
                        kfree(ias_opt);
                        return err;
                }

                /* Copy reply to the user */
                if (copy_to_user(optval, ias_opt,
                                 sizeof(struct irda_ias_set))) {
                        kfree(ias_opt);
                        return -EFAULT;
                }
                /* Note : don't need to put optlen, we checked it */
                kfree(ias_opt);
                break;
        case IRLMP_WAITDEVICE:
                /* This function is just another way of seeing life ;-)
                 * IRLMP_ENUMDEVICES assumes that you have a static network,
                 * and that you just want to pick one of the devices present.
                 * On the other hand, in here we assume that no device is
                 * present and that at some point in the future a device will
                 * come into range. When this device arrive, we just wake
                 * up the caller, so that he has time to connect to it before
                 * the device goes away...
                 * Note : once the node has been discovered for more than a
                 * few second, it won't trigger this function, unless it
                 * goes away and come back changes its hint bits (so we
                 * might call it IRLMP_WAITNEWDEVICE).
                 */

                /* Check that the user is passing us an int */
                if (len != sizeof(int))
                        return -EINVAL;
                /* Get timeout in ms (max time we block the caller) */
                if (get_user(val, (int __user *)optval))
                        return -EFAULT;

                /* Tell IrLMP we want to be notified */
                irlmp_update_client(self->ckey, self->mask.word,
                                    irda_selective_discovery_indication,
                                    NULL, (void *) self);

                /* Do some discovery (and also return cached results) */
                irlmp_discovery_request(self->nslots);

                /* Wait until a node is discovered */
                if (!self->cachedaddr) {
                        int ret = 0;

                        IRDA_DEBUG(1, "%s(), nothing discovered yet, going to sleep...\n", __FUNCTION__);

                        /* Set watchdog timer to expire in <val> ms. */
                        self->errno = 0;
                        init_timer(&self->watchdog);
                        self->watchdog.function = irda_discovery_timeout;
                        self->watchdog.data = (unsigned long) self;
                        self->watchdog.expires = jiffies + (val * HZ/1000);
                        add_timer(&(self->watchdog));

                        /* Wait for IR-LMP to call us back */
                        __wait_event_interruptible(self->query_wait,
                              (self->cachedaddr != 0 || self->errno == -ETIME),
                                                   ret);

                        /* If watchdog is still activated, kill it! */
                        if(timer_pending(&(self->watchdog)))
                                del_timer(&(self->watchdog));

                        IRDA_DEBUG(1, "%s(), ...waking up !\n", __FUNCTION__);

                        if (ret != 0)
                                return ret;
                }
                else
                        IRDA_DEBUG(1, "%s(), found immediately !\n",
                                   __FUNCTION__);

                /* Tell IrLMP that we have been notified */
                irlmp_update_client(self->ckey, self->mask.word,
                                    NULL, NULL, NULL);

                /* Check if the we got some results */
                if (!self->cachedaddr)
                        return -EAGAIN;         /* Didn't find any devices */
                daddr = self->cachedaddr;
                /* Cleanup */
                self->cachedaddr = 0;

                /* We return the daddr of the device that trigger the
                 * wakeup. As irlmp pass us only the new devices, we
                 * are sure that it's not an old device.
                 * If the user want more details, he should query
                 * the whole discovery log and pick one device...
                 */
                if (put_user(daddr, (int __user *)optval))
                        return -EFAULT;

                break;
        default:
                return -ENOPROTOOPT;
        }

        return 0;
}

static struct net_proto_family irda_family_ops = {
        .family = PF_IRDA,
        .create = irda_create,
        .owner  = THIS_MODULE,
};

static struct proto_ops SOCKOPS_WRAPPED(irda_stream_ops) = {
        .family =       PF_IRDA,
        .owner =        THIS_MODULE,
        .release =      irda_release,
        .bind =         irda_bind,
        .connect =      irda_connect,
        .socketpair =   sock_no_socketpair,
        .accept =       irda_accept,
        .getname =      irda_getname,
        .poll =         irda_poll,
        .ioctl =        irda_ioctl,
        .listen =       irda_listen,
        .shutdown =     irda_shutdown,
        .setsockopt =   irda_setsockopt,
        .getsockopt =   irda_getsockopt,
        .sendmsg =      irda_sendmsg,
        .recvmsg =      irda_recvmsg_stream,
        .mmap =         sock_no_mmap,
        .sendpage =     sock_no_sendpage,
};

static struct proto_ops SOCKOPS_WRAPPED(irda_seqpacket_ops) = {
        .family =       PF_IRDA,
        .owner =        THIS_MODULE,
        .release =      irda_release,
        .bind =         irda_bind,
        .connect =      irda_connect,
        .socketpair =   sock_no_socketpair,
        .accept =       irda_accept,
        .getname =      irda_getname,
        .poll =         datagram_poll,
        .ioctl =        irda_ioctl,
        .listen =       irda_listen,
        .shutdown =     irda_shutdown,
        .setsockopt =   irda_setsockopt,
        .getsockopt =   irda_getsockopt,
        .sendmsg =      irda_sendmsg,
        .recvmsg =      irda_recvmsg_dgram,
        .mmap =         sock_no_mmap,
        .sendpage =     sock_no_sendpage,
};

static struct proto_ops SOCKOPS_WRAPPED(irda_dgram_ops) = {
        .family =       PF_IRDA,
        .owner =        THIS_MODULE,
        .release =      irda_release,
        .bind =         irda_bind,
        .connect =      irda_connect,
        .socketpair =   sock_no_socketpair,
        .accept =       irda_accept,
        .getname =      irda_getname,
        .poll =         datagram_poll,
        .ioctl =        irda_ioctl,
        .listen =       irda_listen,
        .shutdown =     irda_shutdown,
        .setsockopt =   irda_setsockopt,
        .getsockopt =   irda_getsockopt,
        .sendmsg =      irda_sendmsg_dgram,
        .recvmsg =      irda_recvmsg_dgram,
        .mmap =         sock_no_mmap,
        .sendpage =     sock_no_sendpage,
};

#ifdef CONFIG_IRDA_ULTRA
static struct proto_ops SOCKOPS_WRAPPED(irda_ultra_ops) = {
        .family =       PF_IRDA,
        .owner =        THIS_MODULE,
        .release =      irda_release,
        .bind =         irda_bind,
        .connect =      sock_no_connect,
        .socketpair =   sock_no_socketpair,
        .accept =       sock_no_accept,
        .getname =      irda_getname,
        .poll =         datagram_poll,
        .ioctl =        irda_ioctl,
        .listen =       sock_no_listen,
        .shutdown =     irda_shutdown,
        .setsockopt =   irda_setsockopt,
        .getsockopt =   irda_getsockopt,
        .sendmsg =      irda_sendmsg_ultra,
        .recvmsg =      irda_recvmsg_dgram,
        .mmap =         sock_no_mmap,
        .sendpage =     sock_no_sendpage,
};
#endif /* CONFIG_IRDA_ULTRA */

#include <linux/smp_lock.h>
SOCKOPS_WRAP(irda_stream, PF_IRDA);
SOCKOPS_WRAP(irda_seqpacket, PF_IRDA);
SOCKOPS_WRAP(irda_dgram, PF_IRDA);
#ifdef CONFIG_IRDA_ULTRA
SOCKOPS_WRAP(irda_ultra, PF_IRDA);
#endif /* CONFIG_IRDA_ULTRA */

/*
 * Function irsock_init (pro)
 *
 *    Initialize IrDA protocol
 *
 */
int __init irsock_init(void)
{
        int rc = proto_register(&irda_proto, 0);

        if (rc == 0)
                rc = sock_register(&irda_family_ops);

        return rc;
}

/*
 * Function irsock_cleanup (void)
 *
 *    Remove IrDA protocol
 *
 */
void __exit irsock_cleanup(void)
{
        sock_unregister(PF_IRDA);
        proto_unregister(&irda_proto);
}