Import 2.3.25pre1

[davej-history.git] / net / irda / af_irda.c

/*********************************************************************
 *                
 * Filename:      af_irda.c
 * Version:       0.7
 * Description:   IrDA sockets implementation
 * Status:        Experimental.
 * Author:        Dag Brattli <dagb@cs.uit.no>
 * Created at:    Sun May 31 10:12:43 1998
 * Modified at:   Fri Oct  1 19:11:04 1999
 * Modified by:   Dag Brattli <dagb@cs.uit.no>
 * Sources:       af_netroom.c, af_ax25.c, af_rose.c, af_x25.c etc.
 * 
 *     Copyright (c) 1999 Dag Brattli, 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.
 *  
 *     Neither Dag Brattli nor University of Tromsø admit liability nor
 *     provide warranty for any of this software. This material is 
 *     provided "AS-IS" and at no charge.
 *     
 ********************************************************************/

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

#include <asm/uaccess.h>

#include <net/sock.h>

#include <net/irda/irda.h>
#include <net/irda/iriap.h>
#include <net/irda/irias_object.h>
#include <net/irda/irttp.h>
#include <net/irda/discovery.h>

extern int  irda_init(void);
extern void irda_cleanup(void);
extern int  irlap_driver_rcv(struct sk_buff *, struct net_device *, 
                             struct packet_type *);

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

static struct proto_ops irda_stream_ops;
static struct proto_ops irda_dgram_ops;
static hashbin_t *cachelog = NULL;
static DECLARE_WAIT_QUEUE_HEAD(discovery_wait); /* Wait for discovery */

#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;

        self = (struct irda_sock *) instance;
        ASSERT(self != NULL, return -1;);

        sk = self->sk;
        ASSERT(sk != NULL, return -1;);

        err = sock_queue_rcv_skb(sk, skb);
        if (err) {
                IRDA_DEBUG(1, __FUNCTION__ "(), error: no more mem!\n");
                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. Chech 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;

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

        self = (struct irda_sock *) instance;

        sk = self->sk;
        if (sk == NULL)
                return;

        sk->state     = TCP_CLOSE;
        sk->err       = reason;
        sk->shutdown |= SEND_SHUTDOWN;
        if (!sk->dead) {
                sk->state_change(sk);
                sk->dead = 1;
        }
}

/*
 * 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;

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

        self = (struct irda_sock *) instance;

        /* 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 */
        if (max_sdu_size == SAR_DISABLE)
                self->max_data_size = irttp_get_max_seq_size(self->tsap);
        else
                self->max_data_size = max_sdu_size;

        IRDA_DEBUG(1, __FUNCTION__ "(), max_data_size=%d\n", self->max_data_size);

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

        sk = self->sk;
        if (sk == NULL)
                return;

        skb_queue_tail(&sk->receive_queue, skb);

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

/*
 * Function irda_connect_indication(instance, sap, qos, max_sdu_size, userdata)
 *
 *    Incomming 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;

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

        self = (struct irda_sock *) instance;

        /* 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 */
        if (max_sdu_size == SAR_DISABLE)
                self->max_data_size = irttp_get_max_seq_size(self->tsap);
        else
                self->max_data_size = max_sdu_size;

        IRDA_DEBUG(1, __FUNCTION__ "(), max_data_size=%d\n", self->max_data_size);

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

        sk = self->sk;
        if (sk == NULL)
                return;
        
        skb_queue_tail(&sk->receive_queue, skb);

        sk->state_change(sk);
}

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

        IRDA_DEBUG(1, __FUNCTION__ "()\n");

        ASSERT(self != NULL, return;);

        skb = dev_alloc_skb(64);
        if (skb == NULL) {
                IRDA_DEBUG(0, __FUNCTION__ "() Unable to allocate sk_buff!\n");
                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(1, __FUNCTION__ "()\n");
        
        self = (struct irda_sock *) instance;
        ASSERT(self != NULL, return;);

        sk = self->sk;
        ASSERT(sk != NULL, return;);
        
        switch (flow) {
        case FLOW_STOP:
                IRDA_DEBUG(1, __FUNCTION__ "(), IrTTP wants us to slow down\n");
                self->tx_flow = flow;
                break;
        case FLOW_START:
                self->tx_flow = flow;
                IRDA_DEBUG(1, __FUNCTION__ "(), IrTTP wants us to start again\n");
                wake_up_interruptible(sk->sleep);
                break;
        default:
                IRDA_DEBUG( 0, __FUNCTION__ "(), Unknown flow command!\n");
        }
}

/*
 * Function irda_get_value_confirm (obj_id, value, priv)
 *
 *    Got answer from remote LM-IAS
 *
 */
static void irda_get_value_confirm(int result, __u16 obj_id, 
                                   struct ias_value *value, void *priv)
{
        struct irda_sock *self;
        
        IRDA_DEBUG(1, __FUNCTION__ "()\n");

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

        /* Check if request succeeded */
        if (result != IAS_SUCCESS) {
                IRDA_DEBUG(0, __FUNCTION__ "(), IAS query failed!\n");

                self->errno = result;

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

                return;
        }

        switch (value->type) {
        case IAS_INTEGER:
                IRDA_DEBUG(4, __FUNCTION__ "() int=%d\n", value->t.integer);
                
                if (value->t.integer != -1) {
                        self->dtsap_sel = value->t.integer;
                } else 
                        self->dtsap_sel = 0;
                break;
        default:
                IRDA_DEBUG(0, __FUNCTION__ "(), bad type!\n");
                break;
        }
        /* Wake up any processes waiting for result */
        wake_up_interruptible(&self->ias_wait);
}

/*
 * Function irda_discovery_indication (log)
 *
 *    Got a discovery log from IrLMP, wake ut any process waiting for answer
 *
 */
static void irda_discovery_indication(hashbin_t *log)
{
        IRDA_DEBUG(1, __FUNCTION__ "()\n");

        cachelog = log;

        /* Wake up process if its waiting for device to be discovered */
        wake_up_interruptible(&discovery_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;
        
        /* 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.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, __FUNCTION__ "(), Unable to allocate TSAP!\n");
                return -1;
        }
        /* Remember which TSAP selector we actually got */
        self->stsap_sel = self->tsap->stsap_sel;

        return 0;
}

/*
 * Function irda_find_lsap_sel (self, name)
 *
 *    Try to lookup LSAP selector in remote LM-IAS
 *
 */
static int irda_find_lsap_sel(struct irda_sock *self, char *name)
{
        IRDA_DEBUG(1, __FUNCTION__ "()\n");

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

        /* Query remote LM-IAS */
        iriap_getvaluebyclass_request(name, "IrDA:TinyTP:LsapSel",
                                      self->saddr, self->daddr,
                                      irda_get_value_confirm, self);
        /* Wait for answer */
        interruptible_sleep_on(&self->ias_wait);

        if (self->dtsap_sel)
                return 0;

        return -ENETUNREACH; /* May not be true */
}

/*
 * 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;

        if (peer) {
                if (sk->state != TCP_ESTABLISHED)
                        return -ENOTCONN;
                
                saddr.sir_family = AF_IRDA;
                saddr.sir_lsap_sel = sk->protinfo.irda->dtsap_sel;
                saddr.sir_addr = sk->protinfo.irda->daddr;
        } else {
                saddr.sir_family = AF_IRDA;
                saddr.sir_lsap_sel = sk->protinfo.irda->stsap_sel;
                saddr.sir_addr = sk->protinfo.irda->saddr;
        }
        
        IRDA_DEBUG(1, __FUNCTION__ "(), tsap_sel = %#x\n", saddr.sir_lsap_sel);
        IRDA_DEBUG(1, __FUNCTION__ "(), addr = %08x\n", saddr.sir_addr);

        if (*uaddr_len > sizeof (struct sockaddr_irda))
                *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;

        if (sk->type == SOCK_STREAM && sk->state != TCP_LISTEN) {
                sk->max_ack_backlog = backlog;
                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;
        __u16 hints = 0;
        int err;

        self = sk->protinfo.irda;
        ASSERT(self != NULL, return -1;);

        if ((addr_len < sizeof(struct sockaddr_irda)) || 
            (addr_len > sizeof(struct sockaddr_irda)))
                return -EINVAL;

        err = irda_open_tsap(self, addr->sir_lsap_sel, addr->sir_name);
        if (err < 0)
                return -ENOMEM;
        
        /*  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);
        irias_insert_object(self->ias_obj);

        /* Fill in some default hint bits values */
        if (strncmp(addr->sir_name, "OBEX", 4) == 0)
                hints = irlmp_service_to_hint(S_OBEX);
        
        if (hints)
                self->skey = irlmp_register_service(hints);

        return 0;
}

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

        IRDA_DEBUG(0, __FUNCTION__ "()\n");

        self = sk->protinfo.irda;
        ASSERT(self != NULL, return -1;);

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

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

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

        if (sk->type != SOCK_STREAM)
                return -EOPNOTSUPP;

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

        /*
         *      The read queue this time is holding sockets ready to use
         *      hooked into the SABM we saved
         */
        do {
                if ((skb = skb_dequeue(&sk->receive_queue)) == NULL) {
                        if (flags & O_NONBLOCK)
                                return -EWOULDBLOCK;

                        interruptible_sleep_on(sk->sleep);
                        if (signal_pending(current)) 
                                return -ERESTARTSYS;
                }
        } while (skb == NULL);

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

        new = newsk->protinfo.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, __FUNCTION__ "(), dup failed!\n");
                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 */
        self->tsap->dtsap_sel = self->tsap->lsap->dlsap_sel = LSAP_ANY;
        self->tsap->lsap->lsap_state = LSAP_DISCONNECTED;

        skb->sk = NULL;
        skb->destructor = NULL;
        kfree_skb(skb);
        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
 *
 */
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;
        int err;

        self = sk->protinfo.irda;

        if (sk->state == TCP_ESTABLISHED && sock->state == SS_CONNECTING) {
                sock->state = SS_CONNECTED;
                return 0;   /* Connect completed during a ERESTARTSYS event */
        }
        
        if (sk->state == TCP_CLOSE && sock->state == SS_CONNECTING) {
                sock->state = SS_UNCONNECTED;
                return -ECONNREFUSED;
        }
        
        if (sk->state == TCP_ESTABLISHED)
                return -EISCONN;      /* No reconnect on a seqpacket socket */
        
        sk->state   = TCP_CLOSE;        
        sock->state = SS_UNCONNECTED;

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

        /* Check if user supplied the required destination device address */
        if (!addr->sir_addr)
                return -EINVAL;

        self->daddr = addr->sir_addr;
        IRDA_DEBUG(1, __FUNCTION__ "(), daddr = %08x\n", self->daddr);

        /* Query remote LM-IAS */
        err = irda_find_lsap_sel(self, addr->sir_name);
        if (err) {
                IRDA_DEBUG(0, __FUNCTION__ "(), connect failed!\n");
                return err;
        }

        /* 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->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, __FUNCTION__ "(), connect failed!\n");
                return err;
        }

        /* Now the loop */
        if (sk->state != TCP_ESTABLISHED && (flags & O_NONBLOCK))
                return -EINPROGRESS;
                
        cli();  /* To avoid races on the sleep */
        
        /* A Connect Ack with Choke or timeout or failed routing will go to
         * closed.  */
        while (sk->state == TCP_SYN_SENT) {
                interruptible_sleep_on(sk->sleep);
                if (signal_pending(current)) {
                        sti();
                        return -ERESTARTSYS;
                }
        }
        
        if (sk->state != TCP_ESTABLISHED) {
                sti();
                sock->state = SS_UNCONNECTED;
                return sock_error(sk);  /* Always set at this point */
        }
        
        sock->state = SS_CONNECTED;
        
        sti();
        
        return 0;
}

/*
 * 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, __FUNCTION__ "()\n");
        
        /* Check for valid socket type */
        switch (sock->type) {
        case SOCK_STREAM:   /* FALLTHROUGH */
        case SOCK_SEQPACKET:
                break;
        default:
                return -ESOCKTNOSUPPORT;
        }

        /* Allocate socket */
        if ((sk = sk_alloc(PF_IRDA, GFP_ATOMIC, 1)) == NULL)
                return -ENOMEM;
        
        self = kmalloc(sizeof(struct irda_sock), GFP_ATOMIC);
        if (self == NULL)
                return -ENOMEM;
        memset(self, 0, sizeof(struct irda_sock));

        init_waitqueue_head(&self->ias_wait);

        self->sk = sk;
        sk->protinfo.irda = self;
        sock_init_data(sock, sk);

        if (sock->type == SOCK_STREAM)
                sock->ops = &irda_stream_ops;
        else
                sock->ops = &irda_dgram_ops;

        sk->protocol = protocol;

        /* Register as a client with IrLMP */
        self->ckey = irlmp_register_client(0, NULL, NULL);
        self->mask = 0xffff;
        self->rx_flow = self->tx_flow = FLOW_START;
        self->max_sdu_size_rx = SAR_DISABLE; /* Default value */
        self->nslots = DISCOVERY_DEFAULT_SLOTS;

        /* Notify that we are using the irda module, so nobody removes it */
        irda_mod_inc_use_count();

        return 0;
}

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

        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);

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

        kfree(self);

        /* Notify that we are not using the irda module anymore */
        irda_mod_dec_use_count();

        return;
}

/*
 * Function irda_release (sock, peer)
 *
 *    
 *
 */
static int irda_release(struct socket *sock)
{
        struct sock *sk = sock->sk;
        
        IRDA_DEBUG(1, __FUNCTION__ "()\n");

        if (sk == NULL) 
                return 0;
        
        sk->state       = TCP_CLOSE;
        sk->shutdown   |= SEND_SHUTDOWN;
        sk->state_change(sk);
        sk->dead        = 1;

        irda_destroy_socket(sk->protinfo.irda);

        sock->sk   = NULL;      
        sk->socket = NULL;      /* Not used, but we should do this. */

        return 0;
}

/*
 * Function irda_sendmsg (sock, msg, len, scm)
 *
 *    Send message down to TinyTP
 *
 */
static int irda_sendmsg(struct socket *sock, struct msghdr *msg, int len, 
                        struct scm_cookie *scm)
{
        struct sock *sk = sock->sk;
/*      struct sockaddr_irda *addr = (struct sockaddr_irda *) msg->msg_name; */
        struct irda_sock *self;
        struct sk_buff *skb;
        unsigned char *asmptr;
        int err;

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

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

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

        self = sk->protinfo.irda;
        ASSERT(self != NULL, return -1;);

        /* Check if IrTTP is wants us to slow down */
        while (self->tx_flow == FLOW_STOP) {
                IRDA_DEBUG(2, __FUNCTION__ "(), IrTTP is busy, going to sleep!\n");
                interruptible_sleep_on(sk->sleep);
                
                /* Check if we are still connected */
                if (sk->state != TCP_ESTABLISHED)
                        return -ENOTCONN;
        }

        /* Check that we don't send out to big frames */
        if (len > self->max_data_size) {
                IRDA_DEBUG(0, __FUNCTION__ "(), Warning to much data! "
                      "Chopping frame from %d to %d bytes!\n", len, 
                      self->max_data_size);
                len = self->max_data_size;
        }

        skb = sock_alloc_send_skb(sk, len + self->max_header_size, 0, 
                                  msg->msg_flags & MSG_DONTWAIT, &err);
        if (!skb)
                return -ENOBUFS;

        skb_reserve(skb, self->max_header_size);
        
        IRDA_DEBUG(4, __FUNCTION__ "(), appending user data\n");
        asmptr = skb->h.raw = skb_put(skb, len);
        memcpy_fromiovec(asmptr, msg->msg_iov, len);

        /* 
         * 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, __FUNCTION__ "(), err=%d\n", err);
                return err;
        }
        return len;
}

/*
 * Function irda_recvmsg (sock, msg, size, flags, scm)
 *
 *    Try to receive message and copy it to user
 *
 */
static int irda_recvmsg_dgram(struct socket *sock, struct msghdr *msg, 
                              int size, int flags, struct scm_cookie *scm)
{
        struct irda_sock *self;
        struct sock *sk = sock->sk;
        struct sk_buff *skb;
        int copied, err;

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

        self = sk->protinfo.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) {
                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->rmem_alloc) << 2) <= sk->rcvbuf) {
                        IRDA_DEBUG(2, __FUNCTION__ "(), Starting IrTTP\n");
                        self->rx_flow = FLOW_START;
                        irttp_flow_request(self->tsap, FLOW_START);
                }
        }

        return copied;
}

/*
 * Function irda_data_wait (sk)
 *
 *    Sleep until data has arrive. But check for races..
 *
 */
static void irda_data_wait(struct sock *sk)
{
        if (!skb_peek(&sk->receive_queue)) {
                sk->socket->flags |= SO_WAITDATA;
                interruptible_sleep_on(sk->sleep);
                sk->socket->flags &= ~SO_WAITDATA;
        }
}

/*
 * Function irda_recvmsg_stream (sock, msg, size, flags, scm)
 *
 *    
 *
 */
static int irda_recvmsg_stream(struct socket *sock, struct msghdr *msg, 
                               int size, int flags, struct scm_cookie *scm)
{
        struct irda_sock *self;
        struct sock *sk = sock->sk;
        int noblock = flags & MSG_DONTWAIT;
        int copied = 0;
        int target = 1;

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

        self = sk->protinfo.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;

        /* Lock the socket to prevent queue disordering
         * while sleeps in memcpy_tomsg
         */
/*      down(&self->readsem); */

        do {
                int chunk;
                struct sk_buff *skb;

                skb=skb_dequeue(&sk->receive_queue);
                if (skb==NULL) {
                        if (copied >= target)
                                break;
                        
                        /*
                         *      POSIX 1003.1g mandates this order.
                         */
                        
                        if (sk->err) {
                                /* up(&self->readsem); */
                                return sock_error(sk);
                        }

                        if (sk->shutdown & RCV_SHUTDOWN)
                                break;

                /*      up(&self->readsem); */

                        if (noblock)
                                return -EAGAIN;
                        irda_data_wait(sk);
                        if (signal_pending(current))
                                return -ERESTARTSYS;
                /*      down(&self->readsem); */
                        continue;
                }

                /* Never glue messages from different writers */
/*              if (check_creds && */
/*                  memcmp(UNIXCREDS(skb), &scm->creds, sizeof(scm->creds)) != 0) */
/*              { */
/*                      skb_queue_head(&sk->receive_queue, skb); */
/*                      break; */
/*              } */

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

                /* Copy credentials */
/*              scm->creds = *UNIXCREDS(skb); */
/*              check_creds = 1; */

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

/*                      if (UNIXCB(skb).fp) */
/*                              unix_detach_fds(scm, skb); */

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

                        kfree_skb(skb);
                        
/*                      if (scm->fp) */
/*                              break; */
                } else {
                        IRDA_DEBUG(0, __FUNCTION__ "() questionable!?\n");
                        /* It is questionable, see note in unix_dgram_recvmsg. */
/*                      if (UNIXCB(skb).fp) */
/*                              scm->fp = scm_fp_dup(UNIXCB(skb).fp); */

                        /* put message back and return */
                        skb_queue_head(&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->rmem_alloc) << 2) <= sk->rcvbuf) {
                        IRDA_DEBUG(2, __FUNCTION__ "(), Starting IrTTP\n");
                        self->rx_flow = FLOW_START;
                        irttp_flow_request(self->tsap, FLOW_START);
                }
        }

        /* up(&self->readsem); */

        return copied;
}

/*
 * Function irda_shutdown (sk, how)
 *
 *    
 *
 */
static int irda_shutdown( struct socket *sk, int how)
{
        IRDA_DEBUG( 0, __FUNCTION__ "()\n");

        /* FIXME - generate DM and RNR states */
        return -EOPNOTSUPP;
}

/*
 * 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;
        unsigned int mask;

        IRDA_DEBUG(1, __FUNCTION__ "()\n");

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

        /* exceptional events? */
        if (sk->err)
                mask |= POLLERR;
        if (sk->shutdown & RCV_SHUTDOWN)
                mask |= POLLHUP;

        /* readable? */
        if (!skb_queue_empty(&sk->receive_queue))
                mask |= POLLIN | POLLRDNORM;

        /* Connection-based need to check for termination and startup */
        if (sk->type == SOCK_STREAM && sk->state==TCP_CLOSE)
                mask |= POLLHUP;

        /*
         * we set writable also when the other side has shut down the
         * connection. This prevents stuck sockets.
         */
        if (sk->sndbuf - (int)atomic_read(&sk->wmem_alloc) >= MIN_WRITE_SPACE)
                        mask |= POLLOUT | POLLWRNORM | POLLWRBAND;

        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, __FUNCTION__ "(), cmd=%#x\n", cmd);
        
        switch (cmd) {
        case TIOCOUTQ: {
                long amount;
                amount = sk->sndbuf - atomic_read(&sk->wmem_alloc);
                if (amount < 0)
                        amount = 0;
                if (put_user(amount, (unsigned int *)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->receive_queue)) != NULL)
                        amount = skb->len;
                if (put_user(amount, (unsigned int *)arg))
                        return -EFAULT;
                return 0;
        }
        
        case SIOCGSTAMP:
                if (sk != NULL) {
                        if (sk->stamp.tv_sec == 0)
                                return -ENOENT;
                        if (copy_to_user((void *)arg, &sk->stamp, 
                                         sizeof(struct timeval)))
                                return -EFAULT;
                        return 0;
                }
                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, __FUNCTION__ "(), doing device ioctl!\n");
                return dev_ioctl(cmd, (void *) 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 *optval, int optlen)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self;
        int opt;
        
        self = sk->protinfo.irda;
        ASSERT(self != NULL, return -1;);

        if (level != SOL_IRLMP)
                return -ENOPROTOOPT;
        
        if (optlen < sizeof(int))
                return -EINVAL;
        
        if (get_user(opt, (int *)optval))
                return -EFAULT;
        
        switch (optname) {
        case IRLMP_IAS_SET:
                IRDA_DEBUG(0, __FUNCTION__ "(), sorry not impl. yet!\n");
                return 0;
        case IRTTP_MAX_SDU_SIZE:
                IRDA_DEBUG(2, __FUNCTION__ "(), setting max_sdu_size = %d\n", opt);
                self->max_sdu_size_rx = opt;
                break;
        default:
                return -ENOPROTOOPT;
        }
        return 0;
}

/*
 * Function irda_getsockopt (sock, level, optname, optval, optlen)
 *
 *    
 *
 */
static int irda_getsockopt(struct socket *sock, int level, int optname, 
                           char *optval, int *optlen)
{
        struct sock *sk = sock->sk;
        struct irda_sock *self;
        struct irda_device_list list;
        struct irda_device_info *info;
        discovery_t *discovery;
        int val = 0;
        int len = 0;
        int offset, total;

        self = sk->protinfo.irda;

        if (level != SOL_IRLMP)
                return -ENOPROTOOPT;

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

        switch (optname) {
        case IRLMP_ENUMDEVICES:
                /* Tell IrLMP we want to be notified */
                irlmp_update_client(self->ckey, self->mask, NULL, 
                                    irda_discovery_indication);
                
                /* Do some discovery */
                irlmp_discovery_request(self->nslots);
                
                /* Check if the we got some results */
                if (!cachelog)
                        return -EAGAIN;

                info = &list.dev[0];

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

                total = offset;   /* Initialized to size of the device list */
                list.len = 0;     /* Initialize lenght of list */

                /* 
                 * Now, check all discovered devices (if any), and notify
                 * client only about the services that the client is
                 * interested in 
                 */
                discovery = (discovery_t *) hashbin_get_first(cachelog);
                while (discovery != NULL) {
                        /* Mask out the ones we don't want */
                        if (discovery->hints.word & self->mask) {
                                
                                /* Check if room for this device entry */
                                if (len - total < sizeof(struct irda_device_info))
                                        break;

                                /* Copy discovery information */
                                info->saddr = discovery->saddr;
                                info->daddr = discovery->daddr;
                                info->charset = discovery->charset;
                                info->hints[0] = discovery->hints.byte[0];
                                info->hints[1] = discovery->hints.byte[1];
                                strncpy(info->info, discovery->nickname,
                                        NICKNAME_MAX_LEN);

                                if (copy_to_user(optval+offset, info, 
                                                 sizeof(struct irda_device_info)))
                                        return -EFAULT;
                                list.len++;
                                total += sizeof(struct irda_device_info);
                        }
                        discovery = (discovery_t *) hashbin_get_next(cachelog);
                }
                cachelog = NULL;

                /* Write total number of bytes used back to client */
                if (put_user(total, optlen))
                        return -EFAULT;

                /* Write total list length back to client */
                if (copy_to_user(optval, &list, 
                                 sizeof(struct irda_device_list) -
                                 sizeof(struct irda_device_info)))
                        return -EFAULT;
                break;
        case IRTTP_MAX_SDU_SIZE:
                val = self->max_data_size;
                IRDA_DEBUG(2, __FUNCTION__ "(), getting max_sdu_size = %d\n", val);
                len = sizeof(int);
                if (put_user(len, optlen))
                        return -EFAULT;
                
                if (copy_to_user(optval, &val, len))
                        return -EFAULT;
                break;
        default:
                return -ENOPROTOOPT;
        }

        return 0;
}

static struct net_proto_family irda_family_ops =
{
        PF_IRDA,
        irda_create
};

static struct proto_ops SOCKOPS_WRAPPED(irda_stream_ops) = {
        PF_IRDA,
        
        irda_release,
        irda_bind,
        irda_connect,
        sock_no_socketpair,
        irda_accept,
        irda_getname,
        irda_poll,
        irda_ioctl,
        irda_listen,
        irda_shutdown,
        irda_setsockopt,
        irda_getsockopt,
        sock_no_fcntl,
        irda_sendmsg,
        irda_recvmsg_stream,
        sock_no_mmap
};

static struct proto_ops SOCKOPS_WRAPPED(irda_dgram_ops) = {
        PF_IRDA,
        
        irda_release,
        irda_bind,
        irda_connect,
        sock_no_socketpair,
        irda_accept,
        irda_getname,
        datagram_poll,
        irda_ioctl,
        irda_listen,
        irda_shutdown,
        irda_setsockopt,
        irda_getsockopt,
        sock_no_fcntl,
        irda_sendmsg,
        irda_recvmsg_dgram,
        sock_no_mmap
};

#include <linux/smp_lock.h>
SOCKOPS_WRAP(irda_dgram, PF_IRDA);
SOCKOPS_WRAP(irda_stream, PF_IRDA);

/*
 * Function irda_device_event (this, event, ptr)
 *
 *    Called when a device is taken up or down
 *
 */
static int irda_device_event(struct notifier_block *this, unsigned long event,
                             void *ptr)
{
        struct net_device *dev = (struct net_device *) ptr;
        
        /* Reject non IrDA devices */
        if (dev->type != ARPHRD_IRDA) 
                return NOTIFY_DONE;
        
        switch (event) {
        case NETDEV_UP:
                IRDA_DEBUG(3, __FUNCTION__ "(), NETDEV_UP\n");
                /* irda_dev_device_up(dev); */
                break;
        case NETDEV_DOWN:
                IRDA_DEBUG(3, __FUNCTION__ "(), NETDEV_DOWN\n");
                /* irda_kill_by_device(dev); */
                /* irda_rt_device_down(dev); */
                /* irda_dev_device_down(dev); */
                break;
        default:
                break;
        }

        return NOTIFY_DONE;
}

static struct packet_type irda_packet_type = 
{
        0,      /* MUTTER ntohs(ETH_P_IRDA),*/
        NULL,
        irlap_driver_rcv,
        NULL,
        NULL,
};

static struct notifier_block irda_dev_notifier = {
        irda_device_event,
        NULL,
        0
};

/*
 * Function irda_proto_init (pro)
 *
 *    Initialize IrDA protocol layer
 *
 */
void __init irda_proto_init(struct net_proto *pro)
{
        sock_register(&irda_family_ops);

        irda_packet_type.type = htons(ETH_P_IRDA);
        dev_add_pack(&irda_packet_type);

        register_netdevice_notifier(&irda_dev_notifier);

        irda_init();
}

/*
 * Function irda_proto_cleanup (void)
 *
 *    Remove IrDA protocol layer
 *
 */
#ifdef MODULE
void irda_proto_cleanup(void)
{
        irda_packet_type.type = htons(ETH_P_IRDA);
        dev_remove_pack(&irda_packet_type);

        unregister_netdevice_notifier(&irda_dev_notifier);
        
        sock_unregister(PF_IRDA);
        irda_cleanup();
        
        return;
}
#endif /* MODULE */