[WAN]: Remove broken and unmaintained Sangoma drivers.
[linux-2.6.git] / net / wanrouter / af_wanpipe.c
1 /*****************************************************************************
2 * af_wanpipe.c  WANPIPE(tm) Secure Socket Layer.
3 *
4 * Author:       Nenad Corbic    <ncorbic@sangoma.com>
5 *
6 * Copyright:    (c) 2000 Sangoma Technologies Inc.
7 *
8 *               This program is free software; you can redistribute it and/or
9 *               modify it under the terms of the GNU General Public License
10 *               as published by the Free Software Foundation; either version
11 *               2 of the License, or (at your option) any later version.
12 * ============================================================================
13 * Due Credit:
14 *               Wanpipe socket layer is based on Packet and 
15 *               the X25 socket layers. The above sockets were 
16 *               used for the specific use of Sangoma Technoloiges 
17 *               API programs. 
18 *               Packet socket Authors: Ross Biro, Fred N. van Kempen and 
19 *                                      Alan Cox.
20 *               X25 socket Author: Jonathan Naylor.
21 * ============================================================================
22 * Mar 15, 2002  Arnaldo C. Melo  o Use wp_sk()->num, as it isnt anymore in sock
23 * Apr 25, 2000  Nenad Corbic     o Added the ability to send zero length packets.
24 * Mar 13, 2000  Nenad Corbic     o Added a tx buffer check via ioctl call.
25 * Mar 06, 2000  Nenad Corbic     o Fixed the corrupt sock lcn problem.
26 *                                  Server and client applicaton can run
27 *                                  simultaneously without conflicts.
28 * Feb 29, 2000  Nenad Corbic     o Added support for PVC protocols, such as
29 *                                  CHDLC, Frame Relay and HDLC API.
30 * Jan 17, 2000  Nenad Corbic     o Initial version, based on AF_PACKET socket.
31 *                                  X25API support only. 
32 *
33 ******************************************************************************/
34
35 #include <linux/config.h>
36 #include <linux/types.h>
37 #include <linux/sched.h>
38 #include <linux/mm.h>
39 #include <linux/capability.h>
40 #include <linux/fcntl.h>
41 #include <linux/socket.h>
42 #include <linux/in.h>
43 #include <linux/inet.h>
44 #include <linux/netdevice.h>
45 #include <linux/poll.h>
46 #include <linux/wireless.h>
47 #include <linux/kmod.h>
48 #include <net/ip.h>
49 #include <net/protocol.h>
50 #include <linux/skbuff.h>
51 #include <net/sock.h>
52 #include <linux/errno.h>
53 #include <linux/timer.h>
54 #include <asm/system.h>
55 #include <asm/uaccess.h>
56 #include <linux/module.h>
57 #include <linux/init.h>
58 #include <linux/if_wanpipe.h>
59 #include <linux/pkt_sched.h>
60 #include <linux/tcp_states.h>
61 #include <linux/if_wanpipe_common.h>
62
63 #ifdef CONFIG_INET
64 #include <net/inet_common.h>
65 #endif
66
67 #define SLOW_BACKOFF 0.1*HZ
68 #define FAST_BACKOFF 0.01*HZ
69
70 //#define PRINT_DEBUG
71 #ifdef PRINT_DEBUG
72         #define DBG_PRINTK(format, a...) printk(format, ## a)
73 #else
74         #define DBG_PRINTK(format, a...)
75 #endif      
76
77
78 /* SECURE SOCKET IMPLEMENTATION 
79  * 
80  *   TRANSMIT:
81  *
82  *      When the user sends a packet via send() system call
83  *      the wanpipe_sendmsg() function is executed.  
84  *      
85  *      Each packet is enqueud into sk->sk_write_queue transmit
86  *      queue. When the packet is enqueued, a delayed transmit
87  *      timer is triggerd which acts as a Bottom Half hander. 
88  *
89  *      wanpipe_delay_transmit() function (BH), dequeues packets
90  *      from the sk->sk_write_queue transmit queue and sends it 
91  *      to the deriver via dev->hard_start_xmit(skb, dev) function.  
92  *      Note, this function is actual a function pointer of if_send()
93  *      routine in the wanpipe driver.
94  *
95  *      X25API GUARANTEED DELIVERY:
96  *
97  *         In order to provide 100% guaranteed packet delivery, 
98  *         an atomic 'packet_sent' counter is implemented.  Counter 
99  *         is incremented for each packet enqueued 
100  *         into sk->sk_write_queue.  Counter is decremented each
101  *         time wanpipe_delayed_transmit() function successfuly 
102  *         passes the packet to the driver. Before each send(), a poll
103  *         routine checks the sock resources The maximum value of
104  *         packet sent counter is 1, thus if one packet is queued, the
105  *         application will block until that packet is passed to the
106  *         driver.
107  *
108  *   RECEIVE:
109  *
110  *      Wanpipe device drivers call the socket bottom half
111  *      function, wanpipe_rcv() to queue the incoming packets
112  *      into an AF_WANPIPE socket queue.  Based on wanpipe_rcv()
113  *      return code, the driver knows whether the packet was
114  *      successfully queued.  If the socket queue is full, 
115  *      protocol flow control is used by the driver, if any, 
116  *      to slow down the traffic until the sock queue is free.
117  *
118  *      Every time a packet arrives into a socket queue the 
119  *      socket wakes up processes which are waiting to receive
120  *      data.
121  *
122  *      If the socket queue is full, the driver sets a block
123  *      bit which signals the socket to kick the wanpipe driver
124  *      bottom half hander when the socket queue is partialy
125  *      empty. wanpipe_recvmsg() function performs this action.
126  * 
127  *      In case of x25api, packets will never be dropped, since
128  *      flow control is available. 
129  *      
130  *      In case of streaming protocols like CHDLC, packets will 
131  *      be dropped but the statistics will be generated. 
132  */
133
134
135 /* The code below is used to test memory leaks. It prints out
136  * a message every time kmalloc and kfree system calls get executed.
137  * If the calls match there is no leak :)
138  */
139
140 /***********FOR DEBUGGING PURPOSES*********************************************
141 #define KMEM_SAFETYZONE 8
142
143 static void * dbg_kmalloc(unsigned int size, int prio, int line) {
144         void * v = kmalloc(size,prio);
145         printk(KERN_INFO "line %d  kmalloc(%d,%d) = %p\n",line,size,prio,v);
146         return v;
147 }
148 static void dbg_kfree(void * v, int line) {
149         printk(KERN_INFO "line %d  kfree(%p)\n",line,v);
150         kfree(v);
151 }
152
153 #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
154 #define kfree(x) dbg_kfree(x,__LINE__)
155 ******************************************************************************/
156
157
158 /* List of all wanpipe sockets. */
159 HLIST_HEAD(wanpipe_sklist);
160 static DEFINE_RWLOCK(wanpipe_sklist_lock);
161
162 atomic_t wanpipe_socks_nr;
163 static unsigned long wanpipe_tx_critical;
164
165 #if 0
166 /* Private wanpipe socket structures. */
167 struct wanpipe_opt
168 {
169         void   *mbox;           /* Mail box  */
170         void   *card;           /* Card bouded to */
171         struct net_device *dev; /* Bounded device */
172         unsigned short lcn;     /* Binded LCN */
173         unsigned char  svc;     /* 0=pvc, 1=svc */
174         unsigned char  timer;   /* flag for delayed transmit*/  
175         struct timer_list tx_timer;
176         unsigned poll_cnt;
177         unsigned char force;    /* Used to force sock release */
178         atomic_t packet_sent;   
179 };
180 #endif
181
182 static int sk_count;
183 extern const struct proto_ops wanpipe_ops;
184 static unsigned long find_free_critical;
185
186 static void wanpipe_unlink_driver(struct sock *sk);
187 static void wanpipe_link_driver(struct net_device *dev, struct sock *sk);
188 static void wanpipe_wakeup_driver(struct sock *sk);
189 static int execute_command(struct sock *, unsigned char, unsigned int);
190 static int check_dev(struct net_device *dev, sdla_t *card);
191 struct net_device *wanpipe_find_free_dev(sdla_t *card);
192 static void wanpipe_unlink_card (struct sock *);
193 static int wanpipe_link_card (struct sock *);
194 static struct sock *wanpipe_make_new(struct sock *);
195 static struct sock *wanpipe_alloc_socket(void);
196 static inline int get_atomic_device(struct net_device *dev);
197 static int wanpipe_exec_cmd(struct sock *, int, unsigned int);
198 static int get_ioctl_cmd (struct sock *, void *);
199 static int set_ioctl_cmd (struct sock *, void *);
200 static void release_device(struct net_device *dev);
201 static void wanpipe_kill_sock_timer (unsigned long data);
202 static void wanpipe_kill_sock_irq (struct sock *);
203 static void wanpipe_kill_sock_accept (struct sock *);
204 static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
205                            int protocol);
206 struct sock * get_newsk_from_skb (struct sk_buff *);
207 static int wanpipe_debug (struct sock *, void *);
208 static void wanpipe_delayed_transmit (unsigned long data);
209 static void release_driver(struct sock *);
210 static void start_cleanup_timer (struct sock *);
211 static void check_write_queue(struct sock *);
212 static int check_driver_busy (struct sock *);
213
214 /*============================================================
215  * wanpipe_rcv
216  *
217  *      Wanpipe socket bottom half handler.  This function
218  *      is called by the WANPIPE device drivers to queue a
219  *      incoming packet into the socket receive queue. 
220  *      Once the packet is queued, all processes waiting to 
221  *      read are woken up.
222  *
223  *      During socket bind, this function is bounded into
224  *      WANPIPE driver private.
225  *===========================================================*/
226
227 static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev,
228                        struct sock *sk)
229 {
230         struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
231         wanpipe_common_t *chan = dev->priv;
232         /*
233          *      When we registered the protocol we saved the socket in the data
234          *      field for just this event.
235          */
236
237         skb->dev = dev;
238
239         sll->sll_family = AF_WANPIPE;
240         sll->sll_hatype = dev->type;
241         sll->sll_protocol = skb->protocol;
242         sll->sll_pkttype = skb->pkt_type;
243         sll->sll_ifindex = dev->ifindex;
244         sll->sll_halen = 0;
245
246         if (dev->hard_header_parse)
247                 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
248
249         /* 
250          * WAN_PACKET_DATA : Data which should be passed up the receive queue.
251          * WAN_PACKET_ASYC : Asynchronous data like place call, which should
252          *                   be passed up the listening sock.
253          * WAN_PACKET_ERR  : Asynchronous data like clear call or restart 
254          *                   which should go into an error queue.
255          */
256         switch (skb->pkt_type){
257
258                 case WAN_PACKET_DATA:
259                         if (sock_queue_rcv_skb(sk,skb)<0){
260                                 return -ENOMEM;
261                         }
262                         break;
263                 case WAN_PACKET_CMD:
264                         sk->sk_state = chan->state;
265                         /* Bug fix: update Mar6. 
266                          * Do not set the sock lcn number here, since
267                          * cmd is not guaranteed to be executed on the
268                          * board, thus Lcn could be wrong */
269                         sk->sk_data_ready(sk, skb->len);
270                         kfree_skb(skb);
271                         break;
272                 case WAN_PACKET_ERR:
273                         sk->sk_state = chan->state;
274                         if (sock_queue_err_skb(sk,skb)<0){
275                                 return -ENOMEM;
276                         }
277                         break;
278                 default:
279                         printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n");
280                         kfree_skb(skb); 
281                         break;
282         }
283
284 //??????????????????????
285 //      if (sk->sk_state == WANSOCK_DISCONNECTED){
286 //              if (sk->sk_zapped) {
287 //                      //printk(KERN_INFO "wansock: Disconnected, killing early\n");
288 //                      wanpipe_unlink_driver(sk);
289 //                      sk->sk_bound_dev_if = 0;
290 //              }
291 //      }
292
293         return 0;
294 }
295
296 /*============================================================
297  * wanpipe_listen_rcv
298  *
299  *      Wanpipe LISTEN socket bottom half handler.  This function
300  *      is called by the WANPIPE device drivers to queue an
301  *      incoming call into the socket listening queue. 
302  *      Once the packet is queued, the waiting accept() process 
303  *      is woken up.
304  *
305  *      During socket bind, this function is bounded into
306  *      WANPIPE driver private. 
307  * 
308  *      IMPORTANT NOTE:
309  *          The accept call() is waiting for an skb packet
310  *          which contains a pointer to a device structure.
311  *
312  *          When we do a bind to a device structre, we 
313  *          bind a newly created socket into "chan->sk".  Thus, 
314  *          when accept receives the skb packet, it will know 
315  *          from which dev it came form, and in turn it will know
316  *          the address of the new sock.
317  *
318  *      NOTE: This function gets called from driver ISR.
319  *===========================================================*/
320
321 static int wanpipe_listen_rcv (struct sk_buff *skb,  struct sock *sk)
322 {
323         wanpipe_opt *wp = wp_sk(sk), *newwp;
324         struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
325         struct sock *newsk;
326         struct net_device *dev; 
327         sdla_t *card;
328         mbox_cmd_t *mbox_ptr;
329         wanpipe_common_t *chan;
330
331         /* Find a free device, if none found, all svc's are busy 
332          */
333
334         card = (sdla_t*)wp->card;
335         if (!card){
336                 printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n");
337                 return -ENODEV;
338         }
339         
340         dev = wanpipe_find_free_dev(card);
341         if (!dev){
342                 printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n");
343                 return -ENODEV;
344         }
345
346         chan=dev->priv; 
347         chan->state = WANSOCK_CONNECTING;
348
349         /* Allocate a new sock, which accept will bind
350          * and pass up to the user 
351          */
352         if ((newsk = wanpipe_make_new(sk)) == NULL){
353                 release_device(dev);
354                 return -ENOMEM;
355         }
356
357
358         /* Initialize the new sock structure 
359          */
360         newsk->sk_bound_dev_if = dev->ifindex;
361         newwp = wp_sk(newsk);
362         newwp->card = wp->card;
363
364         /* Insert the sock into the main wanpipe
365          * sock list.
366          */
367         atomic_inc(&wanpipe_socks_nr);
368
369         /* Allocate and fill in the new Mail Box. Then
370          * bind the mail box to the sock. It will be 
371          * used by the ioctl call to read call information
372          * and to execute commands. 
373          */     
374         if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) {
375                 wanpipe_kill_sock_irq (newsk);
376                 release_device(dev);            
377                 return -ENOMEM;
378         }
379         memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
380         memcpy(mbox_ptr,skb->data,skb->len);
381
382         /* Register the lcn on which incoming call came
383          * from. Thus, if we have to clear it, we know
384          * which lcn to clear
385          */ 
386
387         newwp->lcn = mbox_ptr->cmd.lcn;
388         newwp->mbox = (void *)mbox_ptr;
389
390         DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n",
391                         dev->name,mbox_ptr->cmd.lcn);
392
393         chan->lcn = mbox_ptr->cmd.lcn;
394         card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev;
395
396         sock_reset_flag(newsk, SOCK_ZAPPED);
397         newwp->num = htons(X25_PROT);
398
399         if (wanpipe_do_bind(newsk, dev, newwp->num)) {
400                 wanpipe_kill_sock_irq (newsk);
401                 release_device(dev);
402                 return -EINVAL;
403         }
404         newsk->sk_state = WANSOCK_CONNECTING;
405
406
407         /* Fill in the standard sock address info */
408
409         sll->sll_family = AF_WANPIPE;
410         sll->sll_hatype = dev->type;
411         sll->sll_protocol = skb->protocol;
412         sll->sll_pkttype = skb->pkt_type;
413         sll->sll_ifindex = dev->ifindex;
414         sll->sll_halen = 0;
415
416         skb->dev = dev;
417         sk->sk_ack_backlog++;
418
419         /* We must do this manually, since the sock_queue_rcv_skb()
420          * function sets the skb->dev to NULL.  However, we use
421          * the dev field in the accept function.*/ 
422         if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 
423             (unsigned)sk->sk_rcvbuf) {
424
425                 wanpipe_unlink_driver(newsk);
426                 wanpipe_kill_sock_irq (newsk);
427                 --sk->sk_ack_backlog;
428                 return -ENOMEM;
429         }       
430
431         skb_set_owner_r(skb, sk);
432         skb_queue_tail(&sk->sk_receive_queue, skb);
433         sk->sk_data_ready(sk, skb->len);
434         
435         return 0;
436 }
437
438
439
440 /*============================================================
441  * wanpipe_make_new
442  *
443  *      Create a new sock, and allocate a wanpipe private
444  *      structure to it. Also, copy the important data
445  *      from the original sock to the new sock.
446  *
447  *      This function is used by wanpipe_listen_rcv() listen
448  *      bottom half handler.  A copy of the listening sock
449  *      is created using this function.
450  *
451  *===========================================================*/
452
453 static struct sock *wanpipe_make_new(struct sock *osk)
454 {
455         struct sock *sk;
456
457         if (osk->sk_type != SOCK_RAW)
458                 return NULL;
459
460         if ((sk = wanpipe_alloc_socket()) == NULL)
461                 return NULL;
462
463         sk->sk_type     = osk->sk_type;
464         sk->sk_socket   = osk->sk_socket;
465         sk->sk_priority = osk->sk_priority;
466         sk->sk_protocol = osk->sk_protocol;
467         wp_sk(sk)->num  = wp_sk(osk)->num;
468         sk->sk_rcvbuf   = osk->sk_rcvbuf;
469         sk->sk_sndbuf   = osk->sk_sndbuf;
470         sk->sk_state    = WANSOCK_CONNECTING;
471         sk->sk_sleep    = osk->sk_sleep;
472
473         if (sock_flag(osk, SOCK_DBG))
474                 sock_set_flag(sk, SOCK_DBG);
475
476         return sk;
477 }
478
479 /* 
480  * FIXME: wanpipe_opt has to include a sock in its definition and stop using
481  * sk_protinfo, but this code is not even compilable now, so lets leave it for
482  * later.
483  */
484 static struct proto wanpipe_proto = {
485         .name     = "WANPIPE",
486         .owner    = THIS_MODULE,
487         .obj_size = sizeof(struct sock),
488 };
489
490 /*============================================================
491  * wanpipe_make_new
492  *
493  *      Allocate memory for the a new sock, and sock
494  *      private data.  
495  *      
496  *      Increment the module use count.
497  *              
498  *      This function is used by wanpipe_create() and 
499  *      wanpipe_make_new() functions. 
500  *
501  *===========================================================*/
502
503 static struct sock *wanpipe_alloc_socket(void)
504 {
505         struct sock *sk;
506         struct wanpipe_opt *wan_opt;
507
508         if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL)
509                 return NULL;
510
511         if ((wan_opt = kmalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) {
512                 sk_free(sk);
513                 return NULL;
514         }
515         memset(wan_opt, 0x00, sizeof(struct wanpipe_opt));
516
517         wp_sk(sk) = wan_opt;
518
519         /* Use timer to send data to the driver. This will act
520          * as a BH handler for sendmsg functions */
521         init_timer(&wan_opt->tx_timer);
522         wan_opt->tx_timer.data     = (unsigned long)sk;
523         wan_opt->tx_timer.function = wanpipe_delayed_transmit;
524
525         sock_init_data(NULL, sk);
526         return sk;
527 }
528
529
530 /*============================================================
531  * wanpipe_sendmsg
532  *
533  *      This function implements a sendto() system call,
534  *      for AF_WANPIPE socket family. 
535  *      During socket bind() sk->sk_bound_dev_if is initialized
536  *      to a correct network device. This number is used
537  *      to find a network device to which the packet should
538  *      be passed to.
539  *
540  *      Each packet is queued into sk->sk_write_queue and 
541  *      delayed transmit bottom half handler is marked for 
542  *      execution.
543  *
544  *      A socket must be in WANSOCK_CONNECTED state before
545  *      a packet is queued into sk->sk_write_queue.
546  *===========================================================*/
547
548 static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock,
549                            struct msghdr *msg, int len)
550 {
551         wanpipe_opt *wp;
552         struct sock *sk = sock->sk;
553         struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name;
554         struct sk_buff *skb;
555         struct net_device *dev;
556         unsigned short proto;
557         unsigned char *addr;
558         int ifindex, err, reserve = 0;
559
560         
561         if (!sock_flag(sk, SOCK_ZAPPED))
562                 return -ENETDOWN;
563
564         if (sk->sk_state != WANSOCK_CONNECTED)
565                 return -ENOTCONN;       
566
567         if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) 
568                 return(-EINVAL);
569
570         /* it was <=, now one can send
571          * zero length packets */
572         if (len < sizeof(x25api_hdr_t))
573                 return -EINVAL;
574
575         wp = wp_sk(sk);
576
577         if (saddr == NULL) {
578                 ifindex = sk->sk_bound_dev_if;
579                 proto   = wp->num;
580                 addr    = NULL;
581
582         }else{
583                 if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){ 
584                         return -EINVAL;
585                 }
586
587                 ifindex = sk->sk_bound_dev_if;
588                 proto   = saddr->sll_protocol;
589                 addr    = saddr->sll_addr;
590         }
591
592         dev = dev_get_by_index(ifindex);
593         if (dev == NULL){
594                 printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex);
595                 return -ENXIO;
596         }
597         dev_put(dev);
598         
599         if (sock->type == SOCK_RAW)
600                 reserve = dev->hard_header_len;
601
602         if (len > dev->mtu+reserve){
603                 return -EMSGSIZE;
604         }
605
606         skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
607                                 msg->msg_flags & MSG_DONTWAIT, &err);
608
609         if (skb==NULL){
610                 goto out_unlock;
611         }
612                 
613         skb_reserve(skb, LL_RESERVED_SPACE(dev));
614         skb->nh.raw = skb->data;
615
616         /* Returns -EFAULT on error */
617         err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
618         if (err){
619                 goto out_free;
620         }
621
622         if (dev->hard_header) {
623                 int res;
624                 err = -EINVAL;
625                 res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
626                 if (res<0){
627                         goto out_free;
628                 }
629         }
630
631         skb->protocol = proto;
632         skb->dev = dev;
633         skb->priority = sk->sk_priority;
634         skb->pkt_type = WAN_PACKET_DATA;
635
636         err = -ENETDOWN;
637         if (!(dev->flags & IFF_UP))
638                 goto out_free;
639
640         if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize >
641             (unsigned int)sk->sk_sndbuf){
642                 kfree_skb(skb);
643                 return -ENOBUFS;
644         }
645
646         skb_queue_tail(&sk->sk_write_queue,skb);
647         atomic_inc(&wp->packet_sent);
648
649         if (!(test_and_set_bit(0, &wp->timer)))
650                 mod_timer(&wp->tx_timer, jiffies + 1);
651         
652         return(len);
653
654 out_free:
655         kfree_skb(skb);
656 out_unlock:
657         return err;
658 }
659
660 /*============================================================
661  * wanpipe_delayed_tarnsmit
662  *
663  *      Transmit bottom half handler. It dequeues packets
664  *      from sk->sk_write_queue and passes them to the 
665  *      driver.  If the driver is busy, the packet is 
666  *      re-enqueued.  
667  *
668  *      Packet Sent counter is decremented on successful
669  *      transmission. 
670  *===========================================================*/
671
672
673 static void wanpipe_delayed_transmit (unsigned long data)
674 {
675         struct sock *sk=(struct sock *)data;
676         struct sk_buff *skb;
677         wanpipe_opt *wp = wp_sk(sk);
678         struct net_device *dev = wp->dev;
679         sdla_t *card = (sdla_t*)wp->card;
680
681         if (!card || !dev){
682                 clear_bit(0, &wp->timer);
683                 DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n");
684                 return;
685         }
686         
687         if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) {
688                 clear_bit(0, &wp->timer);
689                 DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n");
690                 return;
691         }
692         
693         /* If driver is executing command, we must offload
694          * the board by not sending data. Otherwise a 
695          * pending command will never get a free buffer
696          * to execute */        
697         if (atomic_read(&card->u.x.command_busy)){
698                 wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
699                 add_timer(&wp->tx_timer);
700                 DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n");
701                 return;
702         }
703
704         
705         if (test_and_set_bit(0,&wanpipe_tx_critical)){
706                 printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name);
707                 wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
708                 add_timer(&wp->tx_timer);
709                 return;
710         }       
711         
712         /* Check for a packet in the fifo and send */
713         if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){
714
715                 if (dev->hard_start_xmit(skb, dev) != 0){                       
716
717                         /* Driver failed to transmit, re-enqueue
718                          * the packet and retry again later */
719                         skb_queue_head(&sk->sk_write_queue,skb);
720                         clear_bit(0,&wanpipe_tx_critical);
721                         return;
722                 }else{
723
724                         /* Packet Sent successful. Check for more packets
725                          * if more packets, re-trigger the transmit routine 
726                          * other wise exit
727                          */
728                         atomic_dec(&wp->packet_sent);
729
730                         if (skb_peek(&sk->sk_write_queue) == NULL) {
731                                 /* If there is nothing to send, kick
732                                  * the poll routine, which will trigger
733                                  * the application to send more data */
734                                 sk->sk_data_ready(sk, 0);
735                                 clear_bit(0, &wp->timer);
736                         }else{
737                                 /* Reschedule as fast as possible */
738                                 wp->tx_timer.expires = jiffies + 1;
739                                 add_timer(&wp->tx_timer);
740                         }
741                 }
742         }
743         clear_bit(0,&wanpipe_tx_critical);
744 }
745
746 /*============================================================
747  * execute_command 
748  *
749  *      Execute x25api commands.  The atomic variable
750  *      chan->command is used to indicate to the driver that
751  *      command is pending for execution.  The acutal command
752  *      structure is placed into a sock mbox structure 
753  *      (wp_sk(sk)->mbox).
754  *
755  *      The sock private structure, mbox is
756  *      used as shared memory between sock and the driver.
757  *      Driver uses the sock mbox to execute the command
758  *      and return the result.  
759  *
760  *      For all command except PLACE CALL, the function
761  *      waits for the result.  PLACE CALL can be ether
762  *      blocking or nonblocking. The user sets this option
763  *      via ioctl call.
764  *===========================================================*/
765
766
767 static int execute_command(struct sock *sk,  unsigned char cmd, unsigned int flags)
768 {
769         wanpipe_opt *wp = wp_sk(sk);
770         struct net_device *dev;
771         wanpipe_common_t *chan=NULL;
772         int err=0;
773         DECLARE_WAITQUEUE(wait, current);
774         
775         dev = dev_get_by_index(sk->sk_bound_dev_if);
776         if (dev == NULL){
777                 printk(KERN_INFO "wansock: Exec failed no dev %i\n",
778                         sk->sk_bound_dev_if);
779                 return -ENODEV;
780         }
781         dev_put(dev);
782
783         if ((chan=dev->priv) == NULL){
784                 printk(KERN_INFO "wansock: Exec cmd failed no priv area\n");
785                 return -ENODEV;
786         }
787
788         if (atomic_read(&chan->command)){
789                 printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n",
790                         atomic_read(&chan->command),dev->name);
791                 return -EINVAL;
792         }
793
794         if (!wp->mbox) {
795                 printk(KERN_INFO "wansock: In execute without MBOX\n");
796                 return -EINVAL;
797         }
798
799         ((mbox_cmd_t*)wp->mbox)->cmd.command = cmd;     
800         ((mbox_cmd_t*)wp->mbox)->cmd.lcn     = wp->lcn;
801         ((mbox_cmd_t*)wp->mbox)->cmd.result  = 0x7F;
802
803
804         if (flags & O_NONBLOCK){
805                 cmd |= 0x80;
806                 atomic_set(&chan->command, cmd);
807         }else{
808                 atomic_set(&chan->command, cmd);
809         }
810
811         add_wait_queue(sk->sk_sleep,&wait);
812         current->state = TASK_INTERRUPTIBLE;
813         for (;;){
814                 if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) {
815                         err = 0;
816                         break;
817                 }
818                 if (signal_pending(current)) {
819                         err = -ERESTARTSYS;
820                         break;
821                 }
822                 schedule();
823         }
824         current->state = TASK_RUNNING;
825         remove_wait_queue(sk->sk_sleep,&wait);
826         
827         return err;
828 }
829
830 /*============================================================
831  * wanpipe_destroy_timer 
832  *
833  *      Used by wanpipe_release, to delay release of
834  *      the socket.
835  *===========================================================*/
836
837 static void wanpipe_destroy_timer(unsigned long data)
838 {
839         struct sock *sk=(struct sock *)data;
840         wanpipe_opt *wp = wp_sk(sk);
841
842         if ((!atomic_read(&sk->sk_wmem_alloc) &&
843              !atomic_read(&sk->sk_rmem_alloc)) ||
844             (++wp->force == 5)) {
845
846                 if (atomic_read(&sk->sk_wmem_alloc) ||
847                     atomic_read(&sk->sk_rmem_alloc))
848                         printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n");
849
850                 kfree(wp);
851                 wp_sk(sk) = NULL;
852                 
853                 if (atomic_read(&sk->sk_refcnt) != 1) {
854                         atomic_set(&sk->sk_refcnt, 1);
855                         DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n",
856                                         atomic_read(&sk->sk_refcnt));
857                 }
858                 sock_put(sk);
859                 atomic_dec(&wanpipe_socks_nr);
860                 return;
861         }
862
863         sk->sk_timer.expires = jiffies + 5 * HZ;
864         add_timer(&sk->sk_timer);
865         printk(KERN_INFO "wansock: packet sk destroy delayed\n");
866 }
867
868 /*============================================================
869  * wanpipe_unlink_driver
870  *
871  *      When the socket is released, this function is 
872  *      used to remove links that bind the sock and the
873  *      driver together.  
874  *===========================================================*/
875 static void wanpipe_unlink_driver (struct sock *sk)
876 {
877         struct net_device *dev;
878         wanpipe_common_t *chan=NULL;
879
880         sock_reset_flag(sk, SOCK_ZAPPED);
881         sk->sk_state = WANSOCK_DISCONNECTED;
882         wp_sk(sk)->dev = NULL;
883
884         dev = dev_get_by_index(sk->sk_bound_dev_if);
885         if (!dev){
886                 printk(KERN_INFO "wansock: No dev on release\n");
887                 return;
888         }                       
889         dev_put(dev);
890
891         if ((chan = dev->priv) == NULL){
892                 printk(KERN_INFO "wansock: No Priv Area on release\n");
893                 return;
894         }
895
896         set_bit(0,&chan->common_critical);
897         chan->sk=NULL;
898         chan->func=NULL;
899         chan->mbox=NULL;
900         chan->tx_timer=NULL;
901         clear_bit(0,&chan->common_critical);
902         release_device(dev);
903         
904         return;
905 }
906
907 /*============================================================
908  * wanpipe_link_driver
909  *
910  *      Upon successful bind(), sock is linked to a driver
911  *      by binding in the wanpipe_rcv() bottom half handler
912  *      to the driver function pointer, as well as sock and
913  *      sock mailbox addresses.  This way driver can pass
914  *      data up the socket.
915  *===========================================================*/
916
917 static void wanpipe_link_driver(struct net_device *dev, struct sock *sk)
918 {
919         wanpipe_opt *wp = wp_sk(sk);
920         wanpipe_common_t *chan = dev->priv;
921         if (!chan)
922                 return;
923         set_bit(0,&chan->common_critical);
924         chan->sk=sk;
925         chan->func=wanpipe_rcv;
926         chan->mbox = wp->mbox;
927         chan->tx_timer = &wp->tx_timer;
928         wp->dev = dev;
929         sock_set_flag(sk, SOCK_ZAPPED);
930         clear_bit(0,&chan->common_critical);
931 }
932
933
934 /*============================================================
935  * release_device
936  *
937  *      During sock release, clear a critical bit, which 
938  *      marks the device a being taken.
939  *===========================================================*/
940
941
942 static void release_device(struct net_device *dev)
943 {
944         wanpipe_common_t *chan=dev->priv;
945         clear_bit(0,(void*)&chan->rw_bind);
946 }
947
948 /*============================================================
949  * wanpipe_release
950  *
951  *      Close a PACKET socket. This is fairly simple. We 
952  *      immediately go to 'closed' state and remove our 
953  *      protocol entry in the device list.
954  *===========================================================*/
955
956 static int wanpipe_release(struct socket *sock)
957 {
958         wanpipe_opt *wp;
959         struct sock *sk = sock->sk;
960         
961         if (!sk)
962                 return 0;
963
964         wp = wp_sk(sk);
965         check_write_queue(sk);
966
967         /* Kill the tx timer, if we don't kill it now, the timer
968          * will run after we kill the sock.  Timer code will 
969          * try to access the sock which has been killed and cause
970          * kernel panic */
971
972         del_timer(&wp->tx_timer);
973
974         /*
975          *      Unhook packet receive handler.
976          */
977
978         if (wp->num == htons(X25_PROT) &&
979             sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) {
980                 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
981                 wanpipe_common_t *chan;
982                 if (dev){
983                         chan=dev->priv;
984                         atomic_set(&chan->disconnect,1);
985                         DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n",
986                                         sk->sk_state);
987                         dev_put(dev);
988                 }       
989         }
990
991         set_bit(1,&wanpipe_tx_critical);
992         write_lock(&wanpipe_sklist_lock);
993         sk_del_node_init(sk);
994         write_unlock(&wanpipe_sklist_lock);
995         clear_bit(1,&wanpipe_tx_critical);
996
997
998         
999         release_driver(sk);
1000
1001         
1002         /*
1003          *      Now the socket is dead. No more input will appear.
1004          */
1005
1006         sk->sk_state_change(sk);        /* It is useless. Just for sanity. */
1007
1008         sock->sk = NULL;
1009         sk->sk_socket = NULL;
1010         sock_set_flag(sk, SOCK_DEAD);
1011
1012         /* Purge queues */
1013         skb_queue_purge(&sk->sk_receive_queue);
1014         skb_queue_purge(&sk->sk_write_queue);
1015         skb_queue_purge(&sk->sk_error_queue);
1016
1017         if (atomic_read(&sk->sk_rmem_alloc) ||
1018             atomic_read(&sk->sk_wmem_alloc)) {
1019                 del_timer(&sk->sk_timer);
1020                 printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n",
1021                         atomic_read(&sk->sk_rmem_alloc),
1022                         atomic_read(&sk->sk_wmem_alloc));
1023                 sk->sk_timer.data       = (unsigned long)sk;
1024                 sk->sk_timer.expires    = jiffies + HZ;
1025                 sk->sk_timer.function   = wanpipe_destroy_timer;
1026                 add_timer(&sk->sk_timer);
1027                 return 0;
1028         }
1029
1030         kfree(wp);
1031         wp_sk(sk) = NULL;
1032
1033         if (atomic_read(&sk->sk_refcnt) != 1) {
1034                 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n",
1035                                         atomic_read(&sk->sk_refcnt));
1036                 atomic_set(&sk->sk_refcnt, 1);
1037         }
1038         sock_put(sk);
1039         atomic_dec(&wanpipe_socks_nr);
1040         return 0;
1041 }
1042
1043 /*============================================================
1044  * check_write_queue
1045  *
1046  *      During sock shutdown, if the sock state is 
1047  *      WANSOCK_CONNECTED and there is transmit data 
1048  *      pending. Wait until data is released 
1049  *      before proceeding.
1050  *===========================================================*/
1051
1052 static void check_write_queue(struct sock *sk)
1053 {
1054
1055         if (sk->sk_state != WANSOCK_CONNECTED)
1056                 return;
1057
1058         if (!atomic_read(&sk->sk_wmem_alloc))
1059                 return;
1060
1061         printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n");
1062
1063 }
1064
1065 /*============================================================
1066  * release_driver
1067  *
1068  *      This function is called during sock shutdown, to 
1069  *      release any resources and links that bind the sock
1070  *      to the driver.  It also changes the state of the
1071  *      sock to WANSOCK_DISCONNECTED
1072  *===========================================================*/
1073
1074 static void release_driver(struct sock *sk)
1075 {
1076         wanpipe_opt *wp;
1077         struct sk_buff *skb=NULL;
1078         struct sock *deadsk=NULL;
1079
1080         if (sk->sk_state == WANSOCK_LISTEN ||
1081             sk->sk_state == WANSOCK_BIND_LISTEN) {
1082                 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
1083                         if ((deadsk = get_newsk_from_skb(skb))){
1084                                 DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n");
1085                                 sock_set_flag(deadsk, SOCK_DEAD);
1086                                 start_cleanup_timer(deadsk);
1087                         }
1088                         kfree_skb(skb);
1089                 }
1090                 if (sock_flag(sk, SOCK_ZAPPED))
1091                         wanpipe_unlink_card(sk);
1092         }else{
1093                 if (sock_flag(sk, SOCK_ZAPPED))
1094                         wanpipe_unlink_driver(sk);
1095         }
1096         sk->sk_state        = WANSOCK_DISCONNECTED;
1097         sk->sk_bound_dev_if = 0;
1098         sock_reset_flag(sk, SOCK_ZAPPED);
1099         wp = wp_sk(sk);
1100
1101         if (wp) {
1102                 kfree(wp->mbox);
1103                 wp->mbox = NULL;
1104         }
1105 }
1106
1107 /*============================================================
1108  *  start_cleanup_timer
1109  *
1110  *      If new incoming call's are pending but the socket
1111  *      is being released, start the timer which will 
1112  *      envoke the kill routines for pending socks.
1113  *===========================================================*/
1114
1115
1116 static void start_cleanup_timer (struct sock *sk)
1117 {
1118         del_timer(&sk->sk_timer);
1119         sk->sk_timer.data       = (unsigned long)sk;
1120         sk->sk_timer.expires    = jiffies + HZ;
1121         sk->sk_timer.function   = wanpipe_kill_sock_timer;
1122         add_timer(&sk->sk_timer);
1123 }
1124
1125
1126 /*============================================================
1127  *  wanpipe_kill_sock
1128  *
1129  *      This is a function which performs actual killing
1130  *      of the sock.  It releases socket resources,
1131  *      and unlinks the sock from the driver. 
1132  *===========================================================*/
1133
1134 static void wanpipe_kill_sock_timer (unsigned long data)
1135 {
1136
1137         struct sock *sk = (struct sock *)data;
1138         struct sock **skp;
1139
1140         if (!sk)
1141                 return;
1142
1143         /* This function can be called from interrupt. We must use
1144          * appropriate locks */
1145         
1146         if (test_bit(1,&wanpipe_tx_critical)){
1147                 sk->sk_timer.expires = jiffies + 10;
1148                 add_timer(&sk->sk_timer);
1149                 return;
1150         }
1151         
1152         write_lock(&wanpipe_sklist_lock);
1153         sk_del_node_init(sk);
1154         write_unlock(&wanpipe_sklist_lock);
1155
1156
1157         if (wp_sk(sk)->num == htons(X25_PROT) &&
1158             sk->sk_state != WANSOCK_DISCONNECTED) {
1159                 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
1160                 wanpipe_common_t *chan;
1161                 if (dev){
1162                         chan=dev->priv;
1163                         atomic_set(&chan->disconnect,1);
1164                         dev_put(dev);
1165                 }       
1166         }
1167
1168         release_driver(sk);
1169
1170         sk->sk_socket = NULL;
1171
1172         /* Purge queues */
1173         skb_queue_purge(&sk->sk_receive_queue);
1174         skb_queue_purge(&sk->sk_write_queue);
1175         skb_queue_purge(&sk->sk_error_queue);
1176         
1177         if (atomic_read(&sk->sk_rmem_alloc) ||
1178             atomic_read(&sk->sk_wmem_alloc)) {
1179                 del_timer(&sk->sk_timer);
1180                 printk(KERN_INFO "wansock: Killing SOCK in Timer\n");
1181                 sk->sk_timer.data       = (unsigned long)sk;
1182                 sk->sk_timer.expires    = jiffies + HZ;
1183                 sk->sk_timer.function   = wanpipe_destroy_timer;
1184                 add_timer(&sk->sk_timer);
1185                 return;
1186         }
1187
1188         kfree(wp_sk(sk));
1189         wp_sk(sk) = NULL;
1190
1191         if (atomic_read(&sk->sk_refcnt) != 1) {
1192                 atomic_set(&sk->sk_refcnt, 1);
1193                 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
1194                                         atomic_read(&sk->sk_refcnt));
1195         }
1196         sock_put(sk);
1197         atomic_dec(&wanpipe_socks_nr);
1198         return;
1199 }
1200
1201 static void wanpipe_kill_sock_accept (struct sock *sk)
1202 {
1203
1204         struct sock **skp;
1205
1206         if (!sk)
1207                 return;
1208
1209         /* This function can be called from interrupt. We must use
1210          * appropriate locks */
1211         
1212         write_lock(&wanpipe_sklist_lock);
1213         sk_del_node_init(sk);
1214         write_unlock(&wanpipe_sklist_lock);
1215
1216         sk->sk_socket = NULL;
1217
1218
1219         kfree(wp_sk(sk));
1220         wp_sk(sk) = NULL;
1221
1222         if (atomic_read(&sk->sk_refcnt) != 1) {
1223                 atomic_set(&sk->sk_refcnt, 1);
1224                 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
1225                                         atomic_read(&sk->sk_refcnt));
1226         }
1227         sock_put(sk);
1228         atomic_dec(&wanpipe_socks_nr);
1229         return;
1230 }
1231
1232
1233 static void wanpipe_kill_sock_irq (struct sock *sk)
1234 {
1235
1236         if (!sk)
1237                 return;
1238
1239         sk->sk_socket = NULL;
1240
1241         kfree(wp_sk(sk));
1242         wp_sk(sk) = NULL;
1243
1244         if (atomic_read(&sk->sk_refcnt) != 1) {
1245                 atomic_set(&sk->sk_refcnt, 1);
1246                 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n",
1247                                         atomic_read(&sk->sk_refcnt));
1248         }
1249         sock_put(sk);
1250         atomic_dec(&wanpipe_socks_nr);
1251 }
1252
1253
1254 /*============================================================
1255  *  wanpipe_do_bind
1256  *
1257  *      Bottom half of the binding system call.
1258  *      Once the wanpipe_bind() function checks  the
1259  *      legality of the call, this function binds the
1260  *      sock to the driver.
1261  *===========================================================*/
1262
1263 static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
1264                            int protocol)
1265 {
1266         wanpipe_opt *wp = wp_sk(sk);
1267         wanpipe_common_t *chan=NULL;
1268         int err=0;
1269
1270         if (sock_flag(sk, SOCK_ZAPPED)) {
1271                 err = -EALREADY;
1272                 goto bind_unlock_exit;
1273         }
1274
1275         wp->num = protocol;
1276
1277         if (protocol == 0){
1278                 release_device(dev);
1279                 err = -EINVAL;
1280                 goto bind_unlock_exit;
1281         }
1282
1283         if (dev) {
1284                 if (dev->flags&IFF_UP) {
1285                         chan=dev->priv;
1286                         sk->sk_state = chan->state;
1287
1288                         if (wp->num == htons(X25_PROT) && 
1289                             sk->sk_state != WANSOCK_DISCONNECTED && 
1290                             sk->sk_state != WANSOCK_CONNECTING) {
1291                                 DBG_PRINTK(KERN_INFO 
1292                                         "wansock: Binding to Device not DISCONNECTED %i\n",
1293                                                 sk->sk_state);
1294                                 release_device(dev);
1295                                 err = -EAGAIN;
1296                                 goto bind_unlock_exit;
1297                         }
1298
1299                         wanpipe_link_driver(dev,sk);
1300                         sk->sk_bound_dev_if = dev->ifindex;
1301
1302                         /* X25 Specific option */
1303                         if (wp->num == htons(X25_PROT))
1304                                 wp_sk(sk)->svc = chan->svc;
1305
1306                 } else {
1307                         sk->sk_err = ENETDOWN;
1308                         sk->sk_error_report(sk);
1309                         release_device(dev);
1310                         err = -EINVAL;
1311                 }
1312         } else {
1313                 err = -ENODEV;
1314         }
1315 bind_unlock_exit:
1316         /* FIXME where is this lock */
1317
1318         return err;
1319 }
1320
1321 /*============================================================
1322  *  wanpipe_bind
1323  *
1324  *      BIND() System call, which is bound to the AF_WANPIPE
1325  *      operations structure.  It checks for correct wanpipe
1326  *      card name, and cross references interface names with
1327  *      the card names.  Thus, interface name must belong to
1328  *      the actual card.
1329  *===========================================================*/
1330
1331
1332 static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1333 {
1334         struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
1335         struct sock *sk=sock->sk;
1336         wanpipe_opt *wp = wp_sk(sk);
1337         struct net_device *dev = NULL;
1338         sdla_t *card=NULL;
1339         char name[15];
1340
1341         /*
1342          *      Check legality
1343          */
1344          
1345         if (addr_len < sizeof(struct wan_sockaddr_ll)){
1346                 printk(KERN_INFO "wansock: Address length error\n");
1347                 return -EINVAL;
1348         }
1349         if (sll->sll_family != AF_WANPIPE){
1350                 printk(KERN_INFO "wansock: Illegal family name specified.\n");
1351                 return -EINVAL;
1352         }
1353
1354         card = wanpipe_find_card (sll->sll_card);
1355         if (!card){
1356                 printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card);
1357                 return -ENODEV;
1358         }else{
1359                 wp_sk(sk)->card = (void *)card;
1360         }
1361
1362         if (!strcmp(sll->sll_device,"svc_listen")){
1363
1364                 /* Bind a sock to a card structure for listening 
1365                  */             
1366                 int err=0; 
1367
1368                 /* This is x25 specific area if protocol doesn't
1369                  * match, return error */
1370                 if (sll->sll_protocol != htons(X25_PROT))
1371                         return -EINVAL;
1372
1373                 err= wanpipe_link_card (sk);
1374                 if (err < 0)
1375                         return err;
1376
1377                 if (sll->sll_protocol)
1378                         wp->num = sll->sll_protocol;
1379                 sk->sk_state = WANSOCK_BIND_LISTEN;
1380                 return 0;
1381
1382         }else if (!strcmp(sll->sll_device,"svc_connect")){ 
1383
1384                 /* This is x25 specific area if protocol doesn't
1385                  * match, return error */
1386                 if (sll->sll_protocol != htons(X25_PROT))
1387                         return -EINVAL;
1388
1389                 /* Find a free device 
1390                  */
1391                 dev = wanpipe_find_free_dev(card);
1392                 if (dev == NULL){
1393                         DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n",
1394                                 card->devname);
1395                         return -EINVAL;
1396                 }
1397         }else{
1398                 /* Bind a socket to a interface name 
1399                  * This is used by PVC mostly
1400                  */
1401                 strlcpy(name,sll->sll_device,sizeof(name));
1402                 dev = dev_get_by_name(name);
1403                 if (dev == NULL){
1404                         printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n",
1405                                         name);
1406                         return -ENODEV;
1407                 }
1408
1409                 dev_put(dev);
1410
1411                 if (check_dev(dev, card)){
1412                         printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n",
1413                                 dev->name, card->devname);
1414                         return -EINVAL;
1415                 }
1416                 if (get_atomic_device (dev))
1417                         return -EINVAL;
1418         }
1419
1420         return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num);
1421 }
1422
1423 /*============================================================
1424  * get_atomic_device
1425  *      
1426  *      Sets a bit atomically which indicates that 
1427  *      the interface is taken. This avoids race conditions.
1428  *===========================================================*/
1429
1430
1431 static inline int get_atomic_device(struct net_device *dev)
1432 {
1433         wanpipe_common_t *chan = dev->priv;
1434         if (!test_and_set_bit(0,(void *)&chan->rw_bind)){
1435                 return 0;
1436         }
1437         return 1;
1438 }
1439
1440 /*============================================================
1441  * check_dev
1442  *      
1443  *      Check that device name belongs to a particular card.
1444  *===========================================================*/
1445
1446 static int check_dev(struct net_device *dev, sdla_t *card)
1447 {
1448         struct net_device* tmp_dev;
1449
1450         for (tmp_dev = card->wandev.dev; tmp_dev;
1451              tmp_dev = *((struct net_device **)tmp_dev->priv)) {
1452                 if (tmp_dev->ifindex == dev->ifindex){ 
1453                         return 0;       
1454                 }
1455         }
1456         return 1;
1457 }
1458
1459 /*============================================================
1460  *  wanpipe_find_free_dev
1461  *      
1462  *      Find a free network interface. If found set atomic
1463  *      bit indicating that the interface is taken.
1464  *      X25API Specific.
1465  *===========================================================*/
1466
1467 struct net_device *wanpipe_find_free_dev(sdla_t *card)
1468 {
1469         struct net_device* dev;
1470         volatile wanpipe_common_t *chan;
1471
1472         if (test_and_set_bit(0,&find_free_critical)){
1473                 printk(KERN_INFO "CRITICAL in Find Free\n");
1474         }       
1475
1476         for (dev = card->wandev.dev; dev;
1477              dev = *((struct net_device **)dev->priv)) {
1478                 chan = dev->priv;
1479                 if (!chan) 
1480                         continue;
1481                 if (chan->usedby == API && chan->svc){
1482                         if (!get_atomic_device (dev)){
1483                                 if (chan->state != WANSOCK_DISCONNECTED){
1484                                         release_device(dev);
1485                                 }else{
1486                                         clear_bit(0,&find_free_critical);
1487                                         return dev;
1488                                 }
1489                         }
1490                 }
1491         }
1492         clear_bit(0,&find_free_critical);
1493         return NULL;
1494 }
1495
1496 /*============================================================
1497  *  wanpipe_create
1498  *      
1499  *      SOCKET() System call.  It allocates a sock structure
1500  *      and adds the socket to the wanpipe_sk_list. 
1501  *      Crates AF_WANPIPE socket.
1502  *===========================================================*/
1503
1504 static int wanpipe_create(struct socket *sock, int protocol)
1505 {
1506         struct sock *sk;
1507         
1508         //FIXME: This checks for root user, SECURITY ?
1509         //if (!capable(CAP_NET_RAW))
1510         //      return -EPERM;
1511
1512         if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1513                 return -ESOCKTNOSUPPORT;
1514
1515         sock->state = SS_UNCONNECTED;
1516
1517         if ((sk = wanpipe_alloc_socket()) == NULL)
1518                 return -ENOBUFS;
1519
1520         sk->sk_reuse = 1;
1521         sock->ops = &wanpipe_ops;
1522         sock_init_data(sock,sk);
1523
1524         sock_reset_flag(sk, SOCK_ZAPPED);
1525         sk->sk_family       = PF_WANPIPE;
1526         wp_sk(sk)->num      = protocol;
1527         sk->sk_state        = WANSOCK_DISCONNECTED;
1528         sk->sk_ack_backlog  = 0;
1529         sk->sk_bound_dev_if = 0;
1530
1531         atomic_inc(&wanpipe_socks_nr);
1532         
1533         /* We must disable interrupts because the ISR
1534          * can also change the list */
1535         set_bit(1,&wanpipe_tx_critical);
1536         write_lock(&wanpipe_sklist_lock);
1537         sk_add_node(sk, &wanpipe_sklist);
1538         write_unlock(&wanpipe_sklist_lock);
1539         clear_bit(1,&wanpipe_tx_critical);
1540
1541         return(0);
1542 }
1543
1544
1545 /*============================================================
1546  *  wanpipe_recvmsg
1547  *      
1548  *      Pull a packet from our receive queue and hand it 
1549  *      to the user. If necessary we block.
1550  *===========================================================*/
1551
1552 static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock,
1553                            struct msghdr *msg, int len, int flags)
1554 {
1555         struct sock *sk = sock->sk;
1556         struct sk_buff *skb;
1557         int copied, err=-ENOBUFS;
1558
1559
1560         /*
1561          *      If the address length field is there to be filled in, we fill
1562          *      it in now.
1563          */
1564
1565         msg->msg_namelen = sizeof(struct wan_sockaddr_ll);
1566
1567         /*
1568          *      Call the generic datagram receiver. This handles all sorts
1569          *      of horrible races and re-entrancy so we can forget about it
1570          *      in the protocol layers.
1571          *
1572          *      Now it will return ENETDOWN, if device have just gone down,
1573          *      but then it will block.
1574          */
1575
1576         if (flags & MSG_OOB){   
1577                 skb = skb_dequeue(&sk->sk_error_queue);
1578         }else{
1579                 skb=skb_recv_datagram(sk,flags,1,&err);
1580         }
1581         /*
1582          *      An error occurred so return it. Because skb_recv_datagram() 
1583          *      handles the blocking we don't see and worry about blocking
1584          *      retries.
1585          */
1586
1587         if(skb==NULL)
1588                 goto out;
1589
1590         /*
1591          *      You lose any data beyond the buffer you gave. If it worries a
1592          *      user program they can ask the device for its MTU anyway.
1593          */
1594
1595         copied = skb->len;
1596         if (copied > len)
1597         {
1598                 copied=len;
1599                 msg->msg_flags|=MSG_TRUNC;
1600         }
1601
1602         wanpipe_wakeup_driver(sk);
1603
1604         /* We can't use skb_copy_datagram here */
1605         err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
1606         if (err)
1607                 goto out_free;
1608         
1609         sock_recv_timestamp(msg, sk, skb);
1610         
1611         if (msg->msg_name)
1612                 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1613
1614         /*
1615          *      Free or return the buffer as appropriate. Again this
1616          *      hides all the races and re-entrancy issues from us.
1617          */
1618         err = (flags&MSG_TRUNC) ? skb->len : copied;
1619
1620 out_free:
1621         skb_free_datagram(sk, skb);
1622 out:
1623         return err;
1624 }
1625
1626
1627 /*============================================================
1628  *  wanpipe_wakeup_driver
1629  *      
1630  *      If socket receive buffer is full and driver cannot
1631  *      pass data up the sock, it sets a packet_block flag.
1632  *      This function check that flag and if sock receive 
1633  *      queue has room it kicks the driver BH handler. 
1634  *
1635  *      This way, driver doesn't have to poll the sock 
1636  *      receive queue.
1637  *===========================================================*/
1638
1639 static void wanpipe_wakeup_driver(struct sock *sk)
1640 {
1641         struct net_device *dev = NULL;
1642         wanpipe_common_t *chan=NULL;
1643
1644         dev = dev_get_by_index(sk->sk_bound_dev_if);
1645         if (!dev)
1646                 return;
1647
1648         dev_put(dev);
1649
1650         if ((chan = dev->priv) == NULL)
1651                 return;
1652         
1653         if (atomic_read(&chan->receive_block)){  
1654                 if (atomic_read(&sk->sk_rmem_alloc) <
1655                     ((unsigned)sk->sk_rcvbuf * 0.9)) {
1656                         printk(KERN_INFO "wansock: Queuing task for wanpipe\n");
1657                         atomic_set(&chan->receive_block,0);
1658                         wanpipe_queue_tq(&chan->wanpipe_task);
1659                         wanpipe_mark_bh();
1660                 }
1661         }       
1662 }       
1663
1664 /*============================================================
1665  *  wanpipe_getname
1666  *      
1667  *      I don't know what to do with this yet. 
1668  *      User can use this function to get sock address
1669  *      information. Not very useful for Sangoma's purposes.
1670  *===========================================================*/
1671
1672
1673 static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr,
1674                           int *uaddr_len, int peer)
1675 {
1676         struct net_device *dev;
1677         struct sock *sk = sock->sk;
1678         struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
1679
1680         sll->sll_family = AF_WANPIPE;
1681         sll->sll_ifindex = sk->sk_bound_dev_if;
1682         sll->sll_protocol = wp_sk(sk)->num;
1683         dev = dev_get_by_index(sk->sk_bound_dev_if);
1684         if (dev) {
1685                 sll->sll_hatype = dev->type;
1686                 sll->sll_halen = dev->addr_len;
1687                 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1688         } else {
1689                 sll->sll_hatype = 0;    /* Bad: we have no ARPHRD_UNSPEC */
1690                 sll->sll_halen = 0;
1691         }
1692         *uaddr_len = sizeof(*sll);
1693         
1694         dev_put(dev);
1695         
1696         return 0;
1697 }
1698
1699 /*============================================================
1700  *  wanpipe_notifier
1701  *      
1702  *      If driver turns off network interface, this function
1703  *      will be envoked. Currently I treate it as a 
1704  *      call disconnect. More thought should go into this
1705  *      function.
1706  *
1707  * FIXME: More thought should go into this function.
1708  *
1709  *===========================================================*/
1710
1711 static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data)
1712 {
1713         struct sock *sk;
1714         hlist_node *node;
1715         struct net_device *dev = (struct net_device *)data;
1716
1717         sk_for_each(sk, node, &wanpipe_sklist) {
1718                 struct wanpipe_opt *po = wp_sk(sk);
1719
1720                 if (!po)
1721                         continue;
1722                 if (dev == NULL)
1723                         continue;
1724                 
1725                 switch (msg) {
1726                 case NETDEV_DOWN:
1727                 case NETDEV_UNREGISTER:
1728                         if (dev->ifindex == sk->sk_bound_dev_if) {
1729                                 printk(KERN_INFO "wansock: Device down %s\n",dev->name);
1730                                 if (sock_flag(sk, SOCK_ZAPPED)) {
1731                                         wanpipe_unlink_driver(sk);
1732                                         sk->sk_err = ENETDOWN;
1733                                         sk->sk_error_report(sk);
1734                                 }
1735
1736                                 if (msg == NETDEV_UNREGISTER) {
1737                                         printk(KERN_INFO "wansock: Unregistering Device: %s\n",
1738                                                           dev->name);
1739                                         wanpipe_unlink_driver(sk);
1740                                         sk->sk_bound_dev_if = 0;
1741                                 }
1742                         }
1743                         break;
1744                 case NETDEV_UP:
1745                         if (dev->ifindex == sk->sk_bound_dev_if &&
1746                             po->num && !sock_flag(sk, SOCK_ZAPPED)) {
1747                                 printk(KERN_INFO "wansock: Registering Device: %s\n",
1748                                                 dev->name);
1749                                 wanpipe_link_driver(dev,sk);
1750                         }
1751                         break;
1752                 }
1753         }
1754         return NOTIFY_DONE;
1755 }
1756
1757 /*============================================================
1758  *  wanpipe_ioctl
1759  *      
1760  *      Execute a user commands, and set socket options.
1761  *
1762  * FIXME: More thought should go into this function.
1763  *
1764  *===========================================================*/
1765
1766 static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1767 {
1768         struct sock *sk = sock->sk;
1769         int err;
1770
1771         switch(cmd) 
1772         {
1773                 case SIOCGSTAMP:
1774                         return sock_get_timestamp(sk, (struct timeval __user *)arg);
1775
1776                 case SIOC_WANPIPE_CHECK_TX:
1777
1778                         return atomic_read(&sk->sk_wmem_alloc);
1779
1780                 case SIOC_WANPIPE_SOCK_STATE:
1781
1782                         if (sk->sk_state == WANSOCK_CONNECTED)
1783                                 return 0;
1784                         
1785                         return 1;
1786
1787
1788                 case SIOC_WANPIPE_GET_CALL_DATA:
1789
1790                         return get_ioctl_cmd (sk,(void*)arg);
1791
1792                 case SIOC_WANPIPE_SET_CALL_DATA:
1793
1794                         return set_ioctl_cmd (sk,(void*)arg);
1795
1796                 case SIOC_WANPIPE_ACCEPT_CALL:
1797                 case SIOC_WANPIPE_CLEAR_CALL:
1798                 case SIOC_WANPIPE_RESET_CALL:
1799
1800                         if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0)
1801                                 return err;
1802
1803                         err=wanpipe_exec_cmd(sk,cmd,0);
1804                         get_ioctl_cmd(sk,(void*)arg);
1805                         return err;
1806
1807                 case SIOC_WANPIPE_DEBUG:
1808
1809                         return wanpipe_debug(sk,(void*)arg);
1810         
1811                 case SIOC_WANPIPE_SET_NONBLOCK:
1812
1813                         if (sk->sk_state != WANSOCK_DISCONNECTED)
1814                                 return -EINVAL;
1815
1816                         sock->file->f_flags |= O_NONBLOCK;
1817                         return 0;
1818         
1819 #ifdef CONFIG_INET
1820                 case SIOCADDRT:
1821                 case SIOCDELRT:
1822                 case SIOCDARP:
1823                 case SIOCGARP:
1824                 case SIOCSARP:
1825                 case SIOCDRARP:
1826                 case SIOCGRARP:
1827                 case SIOCSRARP:
1828                 case SIOCGIFADDR:
1829                 case SIOCSIFADDR:
1830                 case SIOCGIFBRDADDR:
1831                 case SIOCSIFBRDADDR:
1832                 case SIOCGIFNETMASK:
1833                 case SIOCSIFNETMASK:
1834                 case SIOCGIFDSTADDR:
1835                 case SIOCSIFDSTADDR:
1836                 case SIOCSIFFLAGS:
1837                         return inet_dgram_ops.ioctl(sock, cmd, arg);
1838 #endif
1839
1840                 default:
1841                         return -ENOIOCTLCMD;
1842         }
1843         /*NOTREACHED*/
1844 }
1845
1846 /*============================================================
1847  *  wanpipe_debug
1848  *      
1849  *      This function will pass up information about all
1850  *      active sockets.
1851  *
1852  * FIXME: More thought should go into this function.
1853  *
1854  *===========================================================*/
1855
1856 static int wanpipe_debug (struct sock *origsk, void *arg)
1857 {
1858         struct sock *sk;
1859         struct hlist_node *node;
1860         struct net_device *dev = NULL;
1861         wanpipe_common_t *chan=NULL;
1862         int cnt=0, err=0;
1863         wan_debug_t *dbg_data = (wan_debug_t *)arg;
1864
1865         sk_for_each(sk, node, &wanpipe_sklist) {
1866                 wanpipe_opt *wp = wp_sk(sk);
1867
1868                 if (sk == origsk){
1869                         continue;
1870                 }
1871
1872                 if ((err=put_user(1, &dbg_data->debug[cnt].free)))
1873                         return err;
1874                 if ((err = put_user(sk->sk_state,
1875                                     &dbg_data->debug[cnt].state_sk)))
1876                         return err;
1877                 if ((err = put_user(sk->sk_rcvbuf,
1878                                     &dbg_data->debug[cnt].rcvbuf)))
1879                         return err;
1880                 if ((err = put_user(atomic_read(&sk->sk_rmem_alloc),
1881                                     &dbg_data->debug[cnt].rmem)))
1882                         return err;
1883                 if ((err = put_user(atomic_read(&sk->sk_wmem_alloc),
1884                                     &dbg_data->debug[cnt].wmem)))
1885                         return err;
1886                 if ((err = put_user(sk->sk_sndbuf,
1887                                     &dbg_data->debug[cnt].sndbuf)))
1888                         return err;
1889                 if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count)))
1890                         return err;
1891                 if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt)))
1892                         return err;
1893                 if ((err = put_user(sk->sk_bound_dev_if,
1894                                     &dbg_data->debug[cnt].bound)))
1895                         return err;
1896
1897                 if (sk->sk_bound_dev_if) {
1898                         dev = dev_get_by_index(sk->sk_bound_dev_if);
1899                         if (!dev)       
1900                                 continue;
1901
1902                         chan=dev->priv;
1903                         dev_put(dev);
1904         
1905                         if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state)))
1906                                 return err;
1907                         if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc)))
1908                                 return err;
1909
1910                         if ((err=put_user(atomic_read(&chan->command), 
1911                                                 &dbg_data->debug[cnt].command)))
1912                                 return err;
1913
1914
1915                         if (wp){
1916                                 sdla_t *card = (sdla_t*)wp->card;                       
1917         
1918                                 if (card){
1919                                         if ((err=put_user(atomic_read(&card->u.x.command_busy), 
1920                                                                 &dbg_data->debug[cnt].cmd_busy)))
1921                                                 return err;
1922                                 }
1923
1924                                 if ((err=put_user(wp->lcn, 
1925                                                   &dbg_data->debug[cnt].lcn)))
1926                                         return err;
1927                                 
1928                                 if (wp->mbox) {
1929                                         if ((err=put_user(1, &dbg_data->debug[cnt].mbox)))
1930                                                 return err;
1931                                 }
1932                         }
1933
1934                         if ((err=put_user(atomic_read(&chan->receive_block), 
1935                                                                 &dbg_data->debug[cnt].rblock)))
1936                                 return err;
1937
1938                         if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name)))
1939                                 return -EFAULT;
1940                 }
1941         
1942                 if (++cnt == MAX_NUM_DEBUG)
1943                         break;
1944         }
1945         return 0;
1946 }
1947
1948 /*============================================================
1949  *  get_ioctl_cmd
1950  *      
1951  *      Pass up the contents of socket MBOX to the user.
1952  *===========================================================*/
1953
1954 static int get_ioctl_cmd (struct sock *sk, void *arg)
1955 {
1956         x25api_t *usr_data = (x25api_t *)arg;
1957         mbox_cmd_t *mbox_ptr;
1958         int err;
1959
1960         if (usr_data == NULL)
1961                 return -EINVAL;
1962
1963         if (!wp_sk(sk)->mbox) {
1964                 return -EINVAL;
1965         }
1966
1967         mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox;
1968
1969         if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
1970                 return err;
1971         if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
1972                 return err;
1973         if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
1974                 return err;
1975         if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
1976                 return err;
1977         if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
1978                 return err;
1979         if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn)))
1980                 return err;     
1981
1982         if (mbox_ptr->cmd.length > 0){
1983                 if (mbox_ptr->cmd.length > X25_MAX_DATA)
1984                         return -EINVAL;
1985
1986                 if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){
1987                         printk(KERN_INFO "wansock: Copy failed !!!\n");
1988                         return -EFAULT;
1989                 }
1990         }
1991         return 0;
1992
1993
1994 /*============================================================
1995  *  set_ioctl_cmd
1996  *      
1997  *      Before command can be execute, socket MBOX must
1998  *      be created, and initialized with user data.     
1999  *===========================================================*/
2000
2001 static int set_ioctl_cmd (struct sock *sk, void *arg)
2002 {
2003         x25api_t *usr_data = (x25api_t *)arg;
2004         mbox_cmd_t *mbox_ptr;
2005         int err;
2006
2007         if (!wp_sk(sk)->mbox) {
2008                 void *mbox_ptr;
2009                 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
2010                 if (!dev)
2011                         return -ENODEV;
2012
2013                 dev_put(dev);
2014                 
2015                 if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL)
2016                         return -ENOMEM;
2017
2018                 memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
2019                 wp_sk(sk)->mbox = mbox_ptr;
2020
2021                 wanpipe_link_driver(dev,sk);
2022         }
2023
2024         mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox;
2025         memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
2026
2027         if (usr_data == NULL){
2028                 return 0;
2029         }
2030         if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
2031                 return err;
2032         if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
2033                 return err;
2034         if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
2035                 return err;
2036         if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
2037                 return err;
2038         if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
2039                 return err;
2040
2041         if (mbox_ptr->cmd.length > 0){
2042                 if (mbox_ptr->cmd.length > X25_MAX_DATA)
2043                         return -EINVAL;
2044
2045                 if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){
2046                         printk(KERN_INFO "Copy failed\n");
2047                         return -EFAULT;
2048                 }
2049         }
2050         return 0;
2051 }
2052
2053
2054 /*======================================================================
2055  * wanpipe_poll
2056  *
2057  *      Datagram poll: Again totally generic. This also handles
2058  *      sequenced packet sockets providing the socket receive queue
2059  *      is only ever holding data ready to receive.
2060  *
2061  *      Note: when you _don't_ use this routine for this protocol,
2062  *      and you use a different write policy from sock_writeable()
2063  *      then please supply your own write_space callback.
2064  *=====================================================================*/
2065
2066 unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait)
2067 {
2068         struct sock *sk = sock->sk;
2069         unsigned int mask;
2070
2071         ++wp_sk(sk)->poll_cnt;
2072
2073         poll_wait(file, sk->sk_sleep, wait);
2074         mask = 0;
2075
2076         /* exceptional events? */
2077         if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) {
2078                 mask |= POLLPRI;
2079                 return mask;
2080         }
2081         if (sk->sk_shutdown & RCV_SHUTDOWN)
2082                 mask |= POLLHUP;
2083
2084         /* readable? */
2085         if (!skb_queue_empty(&sk->sk_receive_queue)) {
2086                 mask |= POLLIN | POLLRDNORM;
2087         }
2088
2089         /* connection hasn't started yet */
2090         if (sk->sk_state == WANSOCK_CONNECTING) {
2091                 return mask;
2092         }
2093
2094         if (sk->sk_state == WANSOCK_DISCONNECTED) {
2095                 mask = POLLPRI;
2096                 return mask;
2097         }
2098
2099         /* This check blocks the user process if there is   
2100          * a packet already queued in the socket write queue.
2101          * This option is only for X25API protocol, for other
2102          * protocol like chdlc enable streaming mode, 
2103          * where multiple packets can be pending in the socket 
2104          * transmit queue */
2105
2106         if (wp_sk(sk)->num == htons(X25_PROT)) {
2107                 if (atomic_read(&wp_sk(sk)->packet_sent))
2108                         return mask;
2109         }
2110
2111         /* writable? */
2112         if (sock_writeable(sk)){
2113                 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
2114         }else{
2115                 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
2116         }
2117                 
2118         return mask;
2119 }
2120
2121 /*======================================================================
2122  * wanpipe_listen
2123  *
2124  *      X25API Specific function. Set a socket into LISTENING  MODE.
2125  *=====================================================================*/
2126
2127
2128 static int wanpipe_listen(struct socket *sock, int backlog)
2129 {
2130         struct sock *sk = sock->sk;
2131
2132         /* This is x25 specific area if protocol doesn't
2133          * match, return error */
2134         if (wp_sk(sk)->num != htons(X25_PROT))
2135                 return -EINVAL;
2136
2137         if (sk->sk_state == WANSOCK_BIND_LISTEN) {
2138
2139                 sk->sk_max_ack_backlog = backlog;
2140                 sk->sk_state           = WANSOCK_LISTEN;
2141                 return 0;
2142         }else{
2143                 printk(KERN_INFO "wansock: Listening sock was not binded\n");
2144         }
2145
2146         return -EINVAL;
2147 }
2148
2149 /*======================================================================
2150  * wanpipe_link_card
2151  *
2152  *      Connects the listening socket to the driver
2153  *=====================================================================*/
2154
2155 static int wanpipe_link_card (struct sock *sk)
2156 {
2157         sdla_t *card = (sdla_t*)wp_sk(sk)->card;
2158
2159         if (!card)
2160                 return -ENOMEM;
2161
2162         if ((card->sk != NULL) || (card->func != NULL)){
2163                 printk(KERN_INFO "wansock: Listening queue is already established\n");
2164                 return -EINVAL;
2165         }
2166
2167         card->sk=sk;
2168         card->func=wanpipe_listen_rcv;
2169         sock_set_flag(sk, SOCK_ZAPPED);
2170  
2171         return 0;
2172 }
2173
2174 /*======================================================================
2175  * wanpipe_listen
2176  *
2177  *      X25API Specific function. Disconnect listening socket from
2178  *      the driver.
2179  *=====================================================================*/
2180
2181 static void wanpipe_unlink_card (struct sock *sk)
2182 {
2183         sdla_t *card = (sdla_t*)wp_sk(sk)->card; 
2184
2185         if (card){
2186                 card->sk=NULL;
2187                 card->func=NULL;
2188         }
2189 }
2190
2191 /*======================================================================
2192  * wanpipe_exec_cmd
2193  *
2194  *      Ioctl function calls this function to execute user command.
2195  *      Connect() sytem call also calls this function to execute
2196  *      place call.  This function blocks until command is executed.
2197  *=====================================================================*/
2198
2199 static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags)
2200 {
2201         int err = -EINVAL;
2202         wanpipe_opt *wp = wp_sk(sk);
2203         mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox;
2204
2205         if (!mbox_ptr){
2206                 printk(KERN_INFO "NO MBOX PTR !!!!!\n");
2207                 return -EINVAL;
2208         }
2209         
2210         /* This is x25 specific area if protocol doesn't
2211          * match, return error */
2212         if (wp->num != htons(X25_PROT))
2213                 return -EINVAL;
2214
2215
2216         switch (cmd){
2217
2218                 case SIOC_WANPIPE_ACCEPT_CALL:
2219
2220                         if (sk->sk_state != WANSOCK_CONNECTING) {
2221                                 err = -EHOSTDOWN;
2222                                 break;
2223                         }
2224                         
2225                         err = execute_command(sk,X25_ACCEPT_CALL,0);
2226                         if (err < 0)
2227                                 break;
2228
2229                         /* Update. Mar6 2000. 
2230                          * Do not set the sock lcn number here, since
2231                          * it is done in wanpipe_listen_rcv(). 
2232                          */ 
2233                         if (sk->sk_state == WANSOCK_CONNECTED) {
2234                                 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;     
2235                                 DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n",
2236                                         wp->lcn);
2237                                 err = 0;
2238
2239                         }else{
2240                                 DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n",
2241                                         wp->lcn);
2242                                 wp->lcn = 0;
2243                                 err = -ECONNREFUSED;
2244                         }
2245                         break;
2246
2247                 case SIOC_WANPIPE_CLEAR_CALL:
2248
2249                         if (sk->sk_state == WANSOCK_DISCONNECTED) {
2250                                 err = -EINVAL;
2251                                 break;
2252                         }
2253
2254
2255                         /* Check if data buffers are pending for transmission,
2256                          * if so, check whether user wants to wait until data
2257                          * is transmitted, or clear a call and drop packets */
2258                           
2259                         if (atomic_read(&sk->sk_wmem_alloc) ||
2260                             check_driver_busy(sk)) {
2261                                 mbox_cmd_t *mbox = wp->mbox;
2262                                 if (mbox->cmd.qdm & 0x80){
2263                                         mbox->cmd.result = 0x35;
2264                                         err = -EAGAIN;  
2265                                         break;
2266                                 }
2267                         }
2268
2269                         sk->sk_state = WANSOCK_DISCONNECTING;
2270
2271                         err = execute_command(sk,X25_CLEAR_CALL,0);
2272                         if (err < 0)
2273                                 break;
2274
2275                         err = -ECONNREFUSED;
2276                         if (sk->sk_state == WANSOCK_DISCONNECTED) {
2277                                 DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n",
2278                                            wp->lcn);
2279                                 wp->lcn = 0;
2280                                 err = 0;
2281                         }
2282                         break;
2283
2284                 case SIOC_WANPIPE_RESET_CALL:
2285
2286                         if (sk->sk_state != WANSOCK_CONNECTED) {
2287                                 err = -EINVAL;
2288                                 break;
2289                         }
2290
2291
2292                         /* Check if data buffers are pending for transmission,
2293                          * if so, check whether user wants to wait until data
2294                          * is transmitted, or reset a call and drop packets */
2295                           
2296                         if (atomic_read(&sk->sk_wmem_alloc) ||
2297                             check_driver_busy(sk)) {
2298                                 mbox_cmd_t *mbox = wp->mbox;
2299                                 if (mbox->cmd.qdm & 0x80){
2300                                         mbox->cmd.result = 0x35;
2301                                         err = -EAGAIN;  
2302                                         break;
2303                                 }
2304                         }
2305
2306
2307                         err = execute_command(sk, X25_RESET,0);
2308                         if (err < 0)
2309                                 break;
2310
2311                         err = mbox_ptr->cmd.result;
2312                         break;
2313
2314
2315                 case X25_PLACE_CALL:
2316
2317                         err=execute_command(sk,X25_PLACE_CALL,flags);
2318                         if (err < 0)
2319                                 break;
2320
2321                         if (sk->sk_state == WANSOCK_CONNECTED) {
2322
2323                                 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;     
2324
2325                                 DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n",
2326                                         wp->lcn);
2327                                 err = 0;
2328
2329                         } else if (sk->sk_state == WANSOCK_CONNECTING &&
2330                                    (flags & O_NONBLOCK)) {
2331                                 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
2332                                 DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n",
2333                                         wp->lcn);
2334
2335                                 err = 0;
2336
2337                         }else{
2338                                 DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n");
2339                                 err = -ECONNREFUSED;
2340                         }
2341
2342                         break;
2343
2344                 default: 
2345                         return -EINVAL;
2346         }
2347
2348         return err;
2349 }
2350
2351 static int check_driver_busy (struct sock *sk)
2352 {
2353         struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
2354         wanpipe_common_t *chan;
2355
2356         if (!dev)
2357                 return 0;
2358
2359         dev_put(dev);
2360
2361         if ((chan=dev->priv) == NULL)
2362                 return 0;
2363
2364         return atomic_read(&chan->driver_busy);
2365 }
2366
2367
2368 /*======================================================================
2369  * wanpipe_accept
2370  *
2371  *      ACCEPT() System call.   X25API Specific function. 
2372  *      For each incoming call, create a new socket and 
2373  *      return it to the user.  
2374  *=====================================================================*/
2375
2376 static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags)
2377 {
2378         struct sock *sk;
2379         struct sock *newsk;
2380         struct sk_buff *skb;
2381         DECLARE_WAITQUEUE(wait, current);
2382         int err=0;
2383
2384         if (newsock->sk != NULL){
2385                 wanpipe_kill_sock_accept(newsock->sk);  
2386                 newsock->sk=NULL;
2387         }
2388         
2389         if ((sk = sock->sk) == NULL)
2390                 return -EINVAL;
2391
2392         if (sk->sk_type != SOCK_RAW)
2393                 return -EOPNOTSUPP;
2394
2395         if (sk->sk_state != WANSOCK_LISTEN)
2396                 return -EINVAL;
2397
2398         if (wp_sk(sk)->num != htons(X25_PROT))
2399                 return -EINVAL;
2400
2401         add_wait_queue(sk->sk_sleep,&wait);
2402         current->state = TASK_INTERRUPTIBLE;
2403         for (;;){
2404                 skb = skb_dequeue(&sk->sk_receive_queue);
2405                 if (skb){
2406                         err=0;
2407                         break;
2408                 }
2409                 if (signal_pending(current)) {
2410                         err = -ERESTARTSYS;
2411                         break;
2412                 }
2413                 schedule();
2414         }
2415         current->state = TASK_RUNNING;
2416         remove_wait_queue(sk->sk_sleep,&wait);
2417         
2418         if (err != 0)
2419                 return err;
2420         
2421         newsk = get_newsk_from_skb(skb);
2422         if (!newsk){
2423                 return -EINVAL;
2424         }
2425
2426         set_bit(1,&wanpipe_tx_critical);
2427         write_lock(&wanpipe_sklist_lock);
2428         sk_add_node(newsk, &wanpipe_sklist);
2429         write_unlock(&wanpipe_sklist_lock);
2430         clear_bit(1,&wanpipe_tx_critical);
2431
2432         newsk->sk_socket = newsock;
2433         newsk->sk_sleep = &newsock->wait;
2434
2435         /* Now attach up the new socket */
2436         sk->sk_ack_backlog--;
2437         newsock->sk = newsk;
2438         
2439         kfree_skb(skb);
2440
2441         DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n",
2442                    wp_sk(newsk)->lcn);
2443         return 0;
2444 }
2445
2446 /*======================================================================
2447  *  get_newsk_from_skb
2448  *
2449  *      Accept() uses this function to get the address of the new
2450  *      socket structure.
2451  *=====================================================================*/
2452
2453 struct sock * get_newsk_from_skb (struct sk_buff *skb)
2454 {
2455         struct net_device *dev = skb->dev;
2456         wanpipe_common_t *chan; 
2457
2458         if (!dev){
2459                 return NULL;
2460         }
2461                 
2462         if ((chan = dev->priv) == NULL){
2463                 return NULL;
2464         }
2465                 
2466         if (!chan->sk){
2467                 return NULL;
2468         }
2469         return (struct sock *)chan->sk;
2470 }
2471
2472 /*======================================================================
2473  *  wanpipe_connect
2474  *
2475  *      CONNECT() System Call. X25API specific function
2476  *      Check the state of the sock, and execute PLACE_CALL command.
2477  *      Connect can ether block or return without waiting for connection, 
2478  *      if specified by user.
2479  *=====================================================================*/
2480
2481 static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
2482 {
2483         struct sock *sk = sock->sk;
2484         struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr;
2485         struct net_device *dev;
2486         int err;
2487
2488         if (wp_sk(sk)->num != htons(X25_PROT))
2489                 return -EINVAL;
2490
2491         if (sk->sk_state == WANSOCK_CONNECTED)
2492                 return -EISCONN;        /* No reconnect on a seqpacket socket */
2493
2494         if (sk->sk_state != WAN_DISCONNECTED) {
2495                 printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n");
2496                 return -ECONNREFUSED;
2497         }
2498
2499         sk->sk_state = WANSOCK_DISCONNECTED;    
2500         sock->state  = SS_UNCONNECTED;
2501
2502         if (addr_len != sizeof(struct wan_sockaddr_ll))
2503                 return -EINVAL;
2504
2505         if (addr->sll_family != AF_WANPIPE)
2506                 return -EINVAL;
2507
2508         if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL)
2509                 return -ENETUNREACH;
2510
2511         dev_put(dev);
2512         
2513         if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
2514                 return -EINVAL;
2515
2516         sock->state   = SS_CONNECTING;
2517         sk->sk_state  = WANSOCK_CONNECTING;
2518
2519         if (!wp_sk(sk)->mbox) {
2520                 if (wp_sk (sk)->svc)
2521                         return -EINVAL;
2522                 else {
2523                         int err;
2524                         if ((err=set_ioctl_cmd(sk,NULL)) < 0)
2525                                 return err;
2526                 }
2527         }
2528
2529         if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){
2530                 sock->state = SS_UNCONNECTED;
2531                 sk->sk_state = WANSOCK_CONNECTED;
2532                 return err;
2533         }
2534
2535         if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) {
2536                 return 0;
2537         }
2538
2539         if (sk->sk_state != WANSOCK_CONNECTED) {
2540                 sock->state = SS_UNCONNECTED;
2541                 return -ECONNREFUSED; 
2542         }
2543
2544         sock->state = SS_CONNECTED;
2545         return 0;
2546 }
2547
2548 const struct proto_ops wanpipe_ops = {
2549         .family =       PF_WANPIPE,
2550         .owner =        THIS_MODULE,
2551         .release =      wanpipe_release,
2552         .bind =         wanpipe_bind,
2553         .connect =      wanpipe_connect,
2554         .socketpair =   sock_no_socketpair,
2555         .accept =       wanpipe_accept,
2556         .getname =      wanpipe_getname, 
2557         .poll =         wanpipe_poll,
2558         .ioctl =        wanpipe_ioctl,
2559         .listen =       wanpipe_listen, 
2560         .shutdown =     sock_no_shutdown,
2561         .setsockopt =   sock_no_setsockopt,
2562         .getsockopt =   sock_no_getsockopt,
2563         .sendmsg =      wanpipe_sendmsg,
2564         .recvmsg =      wanpipe_recvmsg
2565 };
2566
2567 static struct net_proto_family wanpipe_family_ops = {
2568         .family = PF_WANPIPE,
2569         .create = wanpipe_create,
2570         .owner  = THIS_MODULE,
2571 };
2572
2573 struct notifier_block wanpipe_netdev_notifier = {
2574         .notifier_call = wanpipe_notifier,
2575 };
2576
2577
2578 #ifdef MODULE
2579 void cleanup_module(void)
2580 {
2581         printk(KERN_INFO "wansock: Cleaning up \n");
2582         unregister_netdevice_notifier(&wanpipe_netdev_notifier);
2583         sock_unregister(PF_WANPIPE);
2584         proto_unregister(&wanpipe_proto);
2585 }
2586
2587 int init_module(void)
2588 {
2589         int rc;
2590
2591         printk(KERN_INFO "wansock: Registering Socket \n");
2592
2593         rc = proto_register(&wanpipe_proto, 0);
2594         if (rc != 0)
2595                 goto out;
2596
2597         sock_register(&wanpipe_family_ops);
2598         register_netdevice_notifier(&wanpipe_netdev_notifier);
2599 out:
2600         return rc;
2601 }
2602 #endif
2603 MODULE_LICENSE("GPL");
2604 MODULE_ALIAS_NETPROTO(PF_WANPIPE);