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-rw-r--r--net/wanrouter/af_wanpipe.c2600
1 files changed, 0 insertions, 2600 deletions
diff --git a/net/wanrouter/af_wanpipe.c b/net/wanrouter/af_wanpipe.c
deleted file mode 100644
index 41d7e32be70d..000000000000
--- a/net/wanrouter/af_wanpipe.c
+++ /dev/null
@@ -1,2600 +0,0 @@
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 Technologies
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 application 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/types.h>
36#include <linux/sched.h>
37#include <linux/mm.h>
38#include <linux/capability.h>
39#include <linux/fcntl.h>
40#include <linux/socket.h>
41#include <linux/in.h>
42#include <linux/inet.h>
43#include <linux/netdevice.h>
44#include <linux/poll.h>
45#include <linux/wireless.h>
46#include <linux/kmod.h>
47#include <net/ip.h>
48#include <net/protocol.h>
49#include <linux/skbuff.h>
50#include <net/sock.h>
51#include <linux/errno.h>
52#include <linux/timer.h>
53#include <asm/system.h>
54#include <asm/uaccess.h>
55#include <linux/module.h>
56#include <linux/init.h>
57#include <linux/if_wanpipe.h>
58#include <linux/pkt_sched.h>
59#include <linux/tcp_states.h>
60#include <linux/if_wanpipe_common.h>
61
62#ifdef CONFIG_INET
63#include <net/inet_common.h>
64#endif
65
66#define SLOW_BACKOFF 0.1*HZ
67#define FAST_BACKOFF 0.01*HZ
68
69//#define PRINT_DEBUG
70#ifdef PRINT_DEBUG
71 #define DBG_PRINTK(format, a...) printk(format, ## a)
72#else
73 #define DBG_PRINTK(format, a...)
74#endif
75
76
77/* SECURE SOCKET IMPLEMENTATION
78 *
79 * TRANSMIT:
80 *
81 * When the user sends a packet via send() system call
82 * the wanpipe_sendmsg() function is executed.
83 *
84 * Each packet is enqueud into sk->sk_write_queue transmit
85 * queue. When the packet is enqueued, a delayed transmit
86 * timer is triggerd which acts as a Bottom Half hander.
87 *
88 * wanpipe_delay_transmit() function (BH), dequeues packets
89 * from the sk->sk_write_queue transmit queue and sends it
90 * to the deriver via dev->hard_start_xmit(skb, dev) function.
91 * Note, this function is actual a function pointer of if_send()
92 * routine in the wanpipe driver.
93 *
94 * X25API GUARANTEED DELIVERY:
95 *
96 * In order to provide 100% guaranteed packet delivery,
97 * an atomic 'packet_sent' counter is implemented. Counter
98 * is incremented for each packet enqueued
99 * into sk->sk_write_queue. Counter is decremented each
100 * time wanpipe_delayed_transmit() function successfuly
101 * passes the packet to the driver. Before each send(), a poll
102 * routine checks the sock resources The maximum value of
103 * packet sent counter is 1, thus if one packet is queued, the
104 * application will block until that packet is passed to the
105 * driver.
106 *
107 * RECEIVE:
108 *
109 * Wanpipe device drivers call the socket bottom half
110 * function, wanpipe_rcv() to queue the incoming packets
111 * into an AF_WANPIPE socket queue. Based on wanpipe_rcv()
112 * return code, the driver knows whether the packet was
113 * successfully queued. If the socket queue is full,
114 * protocol flow control is used by the driver, if any,
115 * to slow down the traffic until the sock queue is free.
116 *
117 * Every time a packet arrives into a socket queue the
118 * socket wakes up processes which are waiting to receive
119 * data.
120 *
121 * If the socket queue is full, the driver sets a block
122 * bit which signals the socket to kick the wanpipe driver
123 * bottom half hander when the socket queue is partialy
124 * empty. wanpipe_recvmsg() function performs this action.
125 *
126 * In case of x25api, packets will never be dropped, since
127 * flow control is available.
128 *
129 * In case of streaming protocols like CHDLC, packets will
130 * be dropped but the statistics will be generated.
131 */
132
133
134/* The code below is used to test memory leaks. It prints out
135 * a message every time kmalloc and kfree system calls get executed.
136 * If the calls match there is no leak :)
137 */
138
139/***********FOR DEBUGGING PURPOSES*********************************************
140#define KMEM_SAFETYZONE 8
141
142static void * dbg_kmalloc(unsigned int size, int prio, int line) {
143 void * v = kmalloc(size,prio);
144 printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v);
145 return v;
146}
147static void dbg_kfree(void * v, int line) {
148 printk(KERN_INFO "line %d kfree(%p)\n",line,v);
149 kfree(v);
150}
151
152#define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__)
153#define kfree(x) dbg_kfree(x,__LINE__)
154******************************************************************************/
155
156
157/* List of all wanpipe sockets. */
158HLIST_HEAD(wanpipe_sklist);
159static DEFINE_RWLOCK(wanpipe_sklist_lock);
160
161atomic_t wanpipe_socks_nr;
162static unsigned long wanpipe_tx_critical;
163
164#if 0
165/* Private wanpipe socket structures. */
166struct wanpipe_opt
167{
168 void *mbox; /* Mail box */
169 void *card; /* Card bouded to */
170 struct net_device *dev; /* Bounded device */
171 unsigned short lcn; /* Binded LCN */
172 unsigned char svc; /* 0=pvc, 1=svc */
173 unsigned char timer; /* flag for delayed transmit*/
174 struct timer_list tx_timer;
175 unsigned poll_cnt;
176 unsigned char force; /* Used to force sock release */
177 atomic_t packet_sent;
178};
179#endif
180
181static int sk_count;
182extern const struct proto_ops wanpipe_ops;
183static unsigned long find_free_critical;
184
185static void wanpipe_unlink_driver(struct sock *sk);
186static void wanpipe_link_driver(struct net_device *dev, struct sock *sk);
187static void wanpipe_wakeup_driver(struct sock *sk);
188static int execute_command(struct sock *, unsigned char, unsigned int);
189static int check_dev(struct net_device *dev, sdla_t *card);
190struct net_device *wanpipe_find_free_dev(sdla_t *card);
191static void wanpipe_unlink_card (struct sock *);
192static int wanpipe_link_card (struct sock *);
193static struct sock *wanpipe_make_new(struct sock *);
194static struct sock *wanpipe_alloc_socket(void);
195static inline int get_atomic_device(struct net_device *dev);
196static int wanpipe_exec_cmd(struct sock *, int, unsigned int);
197static int get_ioctl_cmd (struct sock *, void *);
198static int set_ioctl_cmd (struct sock *, void *);
199static void release_device(struct net_device *dev);
200static void wanpipe_kill_sock_timer (unsigned long data);
201static void wanpipe_kill_sock_irq (struct sock *);
202static void wanpipe_kill_sock_accept (struct sock *);
203static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
204 int protocol);
205struct sock * get_newsk_from_skb (struct sk_buff *);
206static int wanpipe_debug (struct sock *, void *);
207static void wanpipe_delayed_transmit (unsigned long data);
208static void release_driver(struct sock *);
209static void start_cleanup_timer (struct sock *);
210static void check_write_queue(struct sock *);
211static int check_driver_busy (struct sock *);
212
213/*============================================================
214 * wanpipe_rcv
215 *
216 * Wanpipe socket bottom half handler. This function
217 * is called by the WANPIPE device drivers to queue a
218 * incoming packet into the socket receive queue.
219 * Once the packet is queued, all processes waiting to
220 * read are woken up.
221 *
222 * During socket bind, this function is bounded into
223 * WANPIPE driver private.
224 *===========================================================*/
225
226static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev,
227 struct sock *sk)
228{
229 struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
230 wanpipe_common_t *chan = dev->priv;
231 /*
232 * When we registered the protocol we saved the socket in the data
233 * field for just this event.
234 */
235
236 skb->dev = dev;
237
238 sll->sll_family = AF_WANPIPE;
239 sll->sll_hatype = dev->type;
240 sll->sll_protocol = skb->protocol;
241 sll->sll_pkttype = skb->pkt_type;
242 sll->sll_ifindex = dev->ifindex;
243 sll->sll_halen = 0;
244
245 if (dev->hard_header_parse)
246 sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr);
247
248 /*
249 * WAN_PACKET_DATA : Data which should be passed up the receive queue.
250 * WAN_PACKET_ASYC : Asynchronous data like place call, which should
251 * be passed up the listening sock.
252 * WAN_PACKET_ERR : Asynchronous data like clear call or restart
253 * which should go into an error queue.
254 */
255 switch (skb->pkt_type){
256
257 case WAN_PACKET_DATA:
258 if (sock_queue_rcv_skb(sk,skb)<0){
259 return -ENOMEM;
260 }
261 break;
262 case WAN_PACKET_CMD:
263 sk->sk_state = chan->state;
264 /* Bug fix: update Mar6.
265 * Do not set the sock lcn number here, since
266 * cmd is not guaranteed to be executed on the
267 * board, thus Lcn could be wrong */
268 sk->sk_data_ready(sk, skb->len);
269 kfree_skb(skb);
270 break;
271 case WAN_PACKET_ERR:
272 sk->sk_state = chan->state;
273 if (sock_queue_err_skb(sk,skb)<0){
274 return -ENOMEM;
275 }
276 break;
277 default:
278 printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n");
279 kfree_skb(skb);
280 break;
281 }
282
283//??????????????????????
284// if (sk->sk_state == WANSOCK_DISCONNECTED){
285// if (sk->sk_zapped) {
286// //printk(KERN_INFO "wansock: Disconnected, killing early\n");
287// wanpipe_unlink_driver(sk);
288// sk->sk_bound_dev_if = 0;
289// }
290// }
291
292 return 0;
293}
294
295/*============================================================
296 * wanpipe_listen_rcv
297 *
298 * Wanpipe LISTEN socket bottom half handler. This function
299 * is called by the WANPIPE device drivers to queue an
300 * incoming call into the socket listening queue.
301 * Once the packet is queued, the waiting accept() process
302 * is woken up.
303 *
304 * During socket bind, this function is bounded into
305 * WANPIPE driver private.
306 *
307 * IMPORTANT NOTE:
308 * The accept call() is waiting for an skb packet
309 * which contains a pointer to a device structure.
310 *
311 * When we do a bind to a device structre, we
312 * bind a newly created socket into "chan->sk". Thus,
313 * when accept receives the skb packet, it will know
314 * from which dev it came form, and in turn it will know
315 * the address of the new sock.
316 *
317 * NOTE: This function gets called from driver ISR.
318 *===========================================================*/
319
320static int wanpipe_listen_rcv (struct sk_buff *skb, struct sock *sk)
321{
322 wanpipe_opt *wp = wp_sk(sk), *newwp;
323 struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb;
324 struct sock *newsk;
325 struct net_device *dev;
326 sdla_t *card;
327 mbox_cmd_t *mbox_ptr;
328 wanpipe_common_t *chan;
329
330 /* Find a free device, if none found, all svc's are busy
331 */
332
333 card = (sdla_t*)wp->card;
334 if (!card){
335 printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n");
336 return -ENODEV;
337 }
338
339 dev = wanpipe_find_free_dev(card);
340 if (!dev){
341 printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n");
342 return -ENODEV;
343 }
344
345 chan=dev->priv;
346 chan->state = WANSOCK_CONNECTING;
347
348 /* Allocate a new sock, which accept will bind
349 * and pass up to the user
350 */
351 if ((newsk = wanpipe_make_new(sk)) == NULL){
352 release_device(dev);
353 return -ENOMEM;
354 }
355
356
357 /* Initialize the new sock structure
358 */
359 newsk->sk_bound_dev_if = dev->ifindex;
360 newwp = wp_sk(newsk);
361 newwp->card = wp->card;
362
363 /* Insert the sock into the main wanpipe
364 * sock list.
365 */
366 atomic_inc(&wanpipe_socks_nr);
367
368 /* Allocate and fill in the new Mail Box. Then
369 * bind the mail box to the sock. It will be
370 * used by the ioctl call to read call information
371 * and to execute commands.
372 */
373 if ((mbox_ptr = kzalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) {
374 wanpipe_kill_sock_irq (newsk);
375 release_device(dev);
376 return -ENOMEM;
377 }
378 memcpy(mbox_ptr,skb->data,skb->len);
379
380 /* Register the lcn on which incoming call came
381 * from. Thus, if we have to clear it, we know
382 * which lcn to clear
383 */
384
385 newwp->lcn = mbox_ptr->cmd.lcn;
386 newwp->mbox = (void *)mbox_ptr;
387
388 DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n",
389 dev->name,mbox_ptr->cmd.lcn);
390
391 chan->lcn = mbox_ptr->cmd.lcn;
392 card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev;
393
394 sock_reset_flag(newsk, SOCK_ZAPPED);
395 newwp->num = htons(X25_PROT);
396
397 if (wanpipe_do_bind(newsk, dev, newwp->num)) {
398 wanpipe_kill_sock_irq (newsk);
399 release_device(dev);
400 return -EINVAL;
401 }
402 newsk->sk_state = WANSOCK_CONNECTING;
403
404
405 /* Fill in the standard sock address info */
406
407 sll->sll_family = AF_WANPIPE;
408 sll->sll_hatype = dev->type;
409 sll->sll_protocol = skb->protocol;
410 sll->sll_pkttype = skb->pkt_type;
411 sll->sll_ifindex = dev->ifindex;
412 sll->sll_halen = 0;
413
414 skb->dev = dev;
415 sk->sk_ack_backlog++;
416
417 /* We must do this manually, since the sock_queue_rcv_skb()
418 * function sets the skb->dev to NULL. However, we use
419 * the dev field in the accept function.*/
420 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
421 (unsigned)sk->sk_rcvbuf) {
422
423 wanpipe_unlink_driver(newsk);
424 wanpipe_kill_sock_irq (newsk);
425 --sk->sk_ack_backlog;
426 return -ENOMEM;
427 }
428
429 skb_set_owner_r(skb, sk);
430 skb_queue_tail(&sk->sk_receive_queue, skb);
431 sk->sk_data_ready(sk, skb->len);
432
433 return 0;
434}
435
436
437
438/*============================================================
439 * wanpipe_make_new
440 *
441 * Create a new sock, and allocate a wanpipe private
442 * structure to it. Also, copy the important data
443 * from the original sock to the new sock.
444 *
445 * This function is used by wanpipe_listen_rcv() listen
446 * bottom half handler. A copy of the listening sock
447 * is created using this function.
448 *
449 *===========================================================*/
450
451static struct sock *wanpipe_make_new(struct sock *osk)
452{
453 struct sock *sk;
454
455 if (osk->sk_type != SOCK_RAW)
456 return NULL;
457
458 if ((sk = wanpipe_alloc_socket()) == NULL)
459 return NULL;
460
461 sk->sk_type = osk->sk_type;
462 sk->sk_socket = osk->sk_socket;
463 sk->sk_priority = osk->sk_priority;
464 sk->sk_protocol = osk->sk_protocol;
465 wp_sk(sk)->num = wp_sk(osk)->num;
466 sk->sk_rcvbuf = osk->sk_rcvbuf;
467 sk->sk_sndbuf = osk->sk_sndbuf;
468 sk->sk_state = WANSOCK_CONNECTING;
469 sk->sk_sleep = osk->sk_sleep;
470
471 if (sock_flag(osk, SOCK_DBG))
472 sock_set_flag(sk, SOCK_DBG);
473
474 return sk;
475}
476
477/*
478 * FIXME: wanpipe_opt has to include a sock in its definition and stop using
479 * sk_protinfo, but this code is not even compilable now, so lets leave it for
480 * later.
481 */
482static struct proto wanpipe_proto = {
483 .name = "WANPIPE",
484 .owner = THIS_MODULE,
485 .obj_size = sizeof(struct sock),
486};
487
488/*============================================================
489 * wanpipe_make_new
490 *
491 * Allocate memory for the a new sock, and sock
492 * private data.
493 *
494 * Increment the module use count.
495 *
496 * This function is used by wanpipe_create() and
497 * wanpipe_make_new() functions.
498 *
499 *===========================================================*/
500
501static struct sock *wanpipe_alloc_socket(void)
502{
503 struct sock *sk;
504 struct wanpipe_opt *wan_opt;
505
506 if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL)
507 return NULL;
508
509 if ((wan_opt = kzalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) {
510 sk_free(sk);
511 return NULL;
512 }
513
514 wp_sk(sk) = wan_opt;
515
516 /* Use timer to send data to the driver. This will act
517 * as a BH handler for sendmsg functions */
518 init_timer(&wan_opt->tx_timer);
519 wan_opt->tx_timer.data = (unsigned long)sk;
520 wan_opt->tx_timer.function = wanpipe_delayed_transmit;
521
522 sock_init_data(NULL, sk);
523 return sk;
524}
525
526
527/*============================================================
528 * wanpipe_sendmsg
529 *
530 * This function implements a sendto() system call,
531 * for AF_WANPIPE socket family.
532 * During socket bind() sk->sk_bound_dev_if is initialized
533 * to a correct network device. This number is used
534 * to find a network device to which the packet should
535 * be passed to.
536 *
537 * Each packet is queued into sk->sk_write_queue and
538 * delayed transmit bottom half handler is marked for
539 * execution.
540 *
541 * A socket must be in WANSOCK_CONNECTED state before
542 * a packet is queued into sk->sk_write_queue.
543 *===========================================================*/
544
545static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock,
546 struct msghdr *msg, int len)
547{
548 wanpipe_opt *wp;
549 struct sock *sk = sock->sk;
550 struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name;
551 struct sk_buff *skb;
552 struct net_device *dev;
553 unsigned short proto;
554 unsigned char *addr;
555 int ifindex, err, reserve = 0;
556
557
558 if (!sock_flag(sk, SOCK_ZAPPED))
559 return -ENETDOWN;
560
561 if (sk->sk_state != WANSOCK_CONNECTED)
562 return -ENOTCONN;
563
564 if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
565 return(-EINVAL);
566
567 /* it was <=, now one can send
568 * zero length packets */
569 if (len < sizeof(x25api_hdr_t))
570 return -EINVAL;
571
572 wp = wp_sk(sk);
573
574 if (saddr == NULL) {
575 ifindex = sk->sk_bound_dev_if;
576 proto = wp->num;
577 addr = NULL;
578
579 }else{
580 if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){
581 return -EINVAL;
582 }
583
584 ifindex = sk->sk_bound_dev_if;
585 proto = saddr->sll_protocol;
586 addr = saddr->sll_addr;
587 }
588
589 dev = dev_get_by_index(ifindex);
590 if (dev == NULL){
591 printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex);
592 return -ENXIO;
593 }
594 dev_put(dev);
595
596 if (sock->type == SOCK_RAW)
597 reserve = dev->hard_header_len;
598
599 if (len > dev->mtu+reserve){
600 return -EMSGSIZE;
601 }
602
603 skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev),
604 msg->msg_flags & MSG_DONTWAIT, &err);
605
606 if (skb==NULL){
607 goto out_unlock;
608 }
609
610 skb_reserve(skb, LL_RESERVED_SPACE(dev));
611 skb->nh.raw = skb->data;
612
613 /* Returns -EFAULT on error */
614 err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len);
615 if (err){
616 goto out_free;
617 }
618
619 if (dev->hard_header) {
620 int res;
621 err = -EINVAL;
622 res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len);
623 if (res<0){
624 goto out_free;
625 }
626 }
627
628 skb->protocol = proto;
629 skb->dev = dev;
630 skb->priority = sk->sk_priority;
631 skb->pkt_type = WAN_PACKET_DATA;
632
633 err = -ENETDOWN;
634 if (!(dev->flags & IFF_UP))
635 goto out_free;
636
637 if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize >
638 (unsigned int)sk->sk_sndbuf){
639 kfree_skb(skb);
640 return -ENOBUFS;
641 }
642
643 skb_queue_tail(&sk->sk_write_queue,skb);
644 atomic_inc(&wp->packet_sent);
645
646 if (!(test_and_set_bit(0, &wp->timer)))
647 mod_timer(&wp->tx_timer, jiffies + 1);
648
649 return(len);
650
651out_free:
652 kfree_skb(skb);
653out_unlock:
654 return err;
655}
656
657/*============================================================
658 * wanpipe_delayed_tarnsmit
659 *
660 * Transmit bottom half handler. It dequeues packets
661 * from sk->sk_write_queue and passes them to the
662 * driver. If the driver is busy, the packet is
663 * re-enqueued.
664 *
665 * Packet Sent counter is decremented on successful
666 * transmission.
667 *===========================================================*/
668
669
670static void wanpipe_delayed_transmit (unsigned long data)
671{
672 struct sock *sk=(struct sock *)data;
673 struct sk_buff *skb;
674 wanpipe_opt *wp = wp_sk(sk);
675 struct net_device *dev = wp->dev;
676 sdla_t *card = (sdla_t*)wp->card;
677
678 if (!card || !dev){
679 clear_bit(0, &wp->timer);
680 DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n");
681 return;
682 }
683
684 if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) {
685 clear_bit(0, &wp->timer);
686 DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n");
687 return;
688 }
689
690 /* If driver is executing command, we must offload
691 * the board by not sending data. Otherwise a
692 * pending command will never get a free buffer
693 * to execute */
694 if (atomic_read(&card->u.x.command_busy)){
695 wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
696 add_timer(&wp->tx_timer);
697 DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n");
698 return;
699 }
700
701
702 if (test_and_set_bit(0,&wanpipe_tx_critical)){
703 printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name);
704 wp->tx_timer.expires = jiffies + SLOW_BACKOFF;
705 add_timer(&wp->tx_timer);
706 return;
707 }
708
709 /* Check for a packet in the fifo and send */
710 if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){
711
712 if (dev->hard_start_xmit(skb, dev) != 0){
713
714 /* Driver failed to transmit, re-enqueue
715 * the packet and retry again later */
716 skb_queue_head(&sk->sk_write_queue,skb);
717 clear_bit(0,&wanpipe_tx_critical);
718 return;
719 }else{
720
721 /* Packet Sent successful. Check for more packets
722 * if more packets, re-trigger the transmit routine
723 * other wise exit
724 */
725 atomic_dec(&wp->packet_sent);
726
727 if (skb_peek(&sk->sk_write_queue) == NULL) {
728 /* If there is nothing to send, kick
729 * the poll routine, which will trigger
730 * the application to send more data */
731 sk->sk_data_ready(sk, 0);
732 clear_bit(0, &wp->timer);
733 }else{
734 /* Reschedule as fast as possible */
735 wp->tx_timer.expires = jiffies + 1;
736 add_timer(&wp->tx_timer);
737 }
738 }
739 }
740 clear_bit(0,&wanpipe_tx_critical);
741}
742
743/*============================================================
744 * execute_command
745 *
746 * Execute x25api commands. The atomic variable
747 * chan->command is used to indicate to the driver that
748 * command is pending for execution. The acutal command
749 * structure is placed into a sock mbox structure
750 * (wp_sk(sk)->mbox).
751 *
752 * The sock private structure, mbox is
753 * used as shared memory between sock and the driver.
754 * Driver uses the sock mbox to execute the command
755 * and return the result.
756 *
757 * For all command except PLACE CALL, the function
758 * waits for the result. PLACE CALL can be ether
759 * blocking or nonblocking. The user sets this option
760 * via ioctl call.
761 *===========================================================*/
762
763
764static int execute_command(struct sock *sk, unsigned char cmd, unsigned int flags)
765{
766 wanpipe_opt *wp = wp_sk(sk);
767 struct net_device *dev;
768 wanpipe_common_t *chan=NULL;
769 int err=0;
770 DECLARE_WAITQUEUE(wait, current);
771
772 dev = dev_get_by_index(sk->sk_bound_dev_if);
773 if (dev == NULL){
774 printk(KERN_INFO "wansock: Exec failed no dev %i\n",
775 sk->sk_bound_dev_if);
776 return -ENODEV;
777 }
778 dev_put(dev);
779
780 if ((chan=dev->priv) == NULL){
781 printk(KERN_INFO "wansock: Exec cmd failed no priv area\n");
782 return -ENODEV;
783 }
784
785 if (atomic_read(&chan->command)){
786 printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n",
787 atomic_read(&chan->command),dev->name);
788 return -EINVAL;
789 }
790
791 if (!wp->mbox) {
792 printk(KERN_INFO "wansock: In execute without MBOX\n");
793 return -EINVAL;
794 }
795
796 ((mbox_cmd_t*)wp->mbox)->cmd.command = cmd;
797 ((mbox_cmd_t*)wp->mbox)->cmd.lcn = wp->lcn;
798 ((mbox_cmd_t*)wp->mbox)->cmd.result = 0x7F;
799
800
801 if (flags & O_NONBLOCK){
802 cmd |= 0x80;
803 atomic_set(&chan->command, cmd);
804 }else{
805 atomic_set(&chan->command, cmd);
806 }
807
808 add_wait_queue(sk->sk_sleep,&wait);
809 current->state = TASK_INTERRUPTIBLE;
810 for (;;){
811 if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) {
812 err = 0;
813 break;
814 }
815 if (signal_pending(current)) {
816 err = -ERESTARTSYS;
817 break;
818 }
819 schedule();
820 }
821 current->state = TASK_RUNNING;
822 remove_wait_queue(sk->sk_sleep,&wait);
823
824 return err;
825}
826
827/*============================================================
828 * wanpipe_destroy_timer
829 *
830 * Used by wanpipe_release, to delay release of
831 * the socket.
832 *===========================================================*/
833
834static void wanpipe_destroy_timer(unsigned long data)
835{
836 struct sock *sk=(struct sock *)data;
837 wanpipe_opt *wp = wp_sk(sk);
838
839 if ((!atomic_read(&sk->sk_wmem_alloc) &&
840 !atomic_read(&sk->sk_rmem_alloc)) ||
841 (++wp->force == 5)) {
842
843 if (atomic_read(&sk->sk_wmem_alloc) ||
844 atomic_read(&sk->sk_rmem_alloc))
845 printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n");
846
847 kfree(wp);
848 wp_sk(sk) = NULL;
849
850 if (atomic_read(&sk->sk_refcnt) != 1) {
851 atomic_set(&sk->sk_refcnt, 1);
852 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n",
853 atomic_read(&sk->sk_refcnt));
854 }
855 sock_put(sk);
856 atomic_dec(&wanpipe_socks_nr);
857 return;
858 }
859
860 sk->sk_timer.expires = jiffies + 5 * HZ;
861 add_timer(&sk->sk_timer);
862 printk(KERN_INFO "wansock: packet sk destroy delayed\n");
863}
864
865/*============================================================
866 * wanpipe_unlink_driver
867 *
868 * When the socket is released, this function is
869 * used to remove links that bind the sock and the
870 * driver together.
871 *===========================================================*/
872static void wanpipe_unlink_driver (struct sock *sk)
873{
874 struct net_device *dev;
875 wanpipe_common_t *chan=NULL;
876
877 sock_reset_flag(sk, SOCK_ZAPPED);
878 sk->sk_state = WANSOCK_DISCONNECTED;
879 wp_sk(sk)->dev = NULL;
880
881 dev = dev_get_by_index(sk->sk_bound_dev_if);
882 if (!dev){
883 printk(KERN_INFO "wansock: No dev on release\n");
884 return;
885 }
886 dev_put(dev);
887
888 if ((chan = dev->priv) == NULL){
889 printk(KERN_INFO "wansock: No Priv Area on release\n");
890 return;
891 }
892
893 set_bit(0,&chan->common_critical);
894 chan->sk=NULL;
895 chan->func=NULL;
896 chan->mbox=NULL;
897 chan->tx_timer=NULL;
898 clear_bit(0,&chan->common_critical);
899 release_device(dev);
900
901 return;
902}
903
904/*============================================================
905 * wanpipe_link_driver
906 *
907 * Upon successful bind(), sock is linked to a driver
908 * by binding in the wanpipe_rcv() bottom half handler
909 * to the driver function pointer, as well as sock and
910 * sock mailbox addresses. This way driver can pass
911 * data up the socket.
912 *===========================================================*/
913
914static void wanpipe_link_driver(struct net_device *dev, struct sock *sk)
915{
916 wanpipe_opt *wp = wp_sk(sk);
917 wanpipe_common_t *chan = dev->priv;
918 if (!chan)
919 return;
920 set_bit(0,&chan->common_critical);
921 chan->sk=sk;
922 chan->func=wanpipe_rcv;
923 chan->mbox = wp->mbox;
924 chan->tx_timer = &wp->tx_timer;
925 wp->dev = dev;
926 sock_set_flag(sk, SOCK_ZAPPED);
927 clear_bit(0,&chan->common_critical);
928}
929
930
931/*============================================================
932 * release_device
933 *
934 * During sock release, clear a critical bit, which
935 * marks the device a being taken.
936 *===========================================================*/
937
938
939static void release_device(struct net_device *dev)
940{
941 wanpipe_common_t *chan=dev->priv;
942 clear_bit(0,(void*)&chan->rw_bind);
943}
944
945/*============================================================
946 * wanpipe_release
947 *
948 * Close a PACKET socket. This is fairly simple. We
949 * immediately go to 'closed' state and remove our
950 * protocol entry in the device list.
951 *===========================================================*/
952
953static int wanpipe_release(struct socket *sock)
954{
955 wanpipe_opt *wp;
956 struct sock *sk = sock->sk;
957
958 if (!sk)
959 return 0;
960
961 wp = wp_sk(sk);
962 check_write_queue(sk);
963
964 /* Kill the tx timer, if we don't kill it now, the timer
965 * will run after we kill the sock. Timer code will
966 * try to access the sock which has been killed and cause
967 * kernel panic */
968
969 del_timer(&wp->tx_timer);
970
971 /*
972 * Unhook packet receive handler.
973 */
974
975 if (wp->num == htons(X25_PROT) &&
976 sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) {
977 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
978 wanpipe_common_t *chan;
979 if (dev){
980 chan=dev->priv;
981 atomic_set(&chan->disconnect,1);
982 DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n",
983 sk->sk_state);
984 dev_put(dev);
985 }
986 }
987
988 set_bit(1,&wanpipe_tx_critical);
989 write_lock(&wanpipe_sklist_lock);
990 sk_del_node_init(sk);
991 write_unlock(&wanpipe_sklist_lock);
992 clear_bit(1,&wanpipe_tx_critical);
993
994
995
996 release_driver(sk);
997
998
999 /*
1000 * Now the socket is dead. No more input will appear.
1001 */
1002
1003 sk->sk_state_change(sk); /* It is useless. Just for sanity. */
1004
1005 sock->sk = NULL;
1006 sk->sk_socket = NULL;
1007 sock_set_flag(sk, SOCK_DEAD);
1008
1009 /* Purge queues */
1010 skb_queue_purge(&sk->sk_receive_queue);
1011 skb_queue_purge(&sk->sk_write_queue);
1012 skb_queue_purge(&sk->sk_error_queue);
1013
1014 if (atomic_read(&sk->sk_rmem_alloc) ||
1015 atomic_read(&sk->sk_wmem_alloc)) {
1016 del_timer(&sk->sk_timer);
1017 printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n",
1018 atomic_read(&sk->sk_rmem_alloc),
1019 atomic_read(&sk->sk_wmem_alloc));
1020 sk->sk_timer.data = (unsigned long)sk;
1021 sk->sk_timer.expires = jiffies + HZ;
1022 sk->sk_timer.function = wanpipe_destroy_timer;
1023 add_timer(&sk->sk_timer);
1024 return 0;
1025 }
1026
1027 kfree(wp);
1028 wp_sk(sk) = NULL;
1029
1030 if (atomic_read(&sk->sk_refcnt) != 1) {
1031 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n",
1032 atomic_read(&sk->sk_refcnt));
1033 atomic_set(&sk->sk_refcnt, 1);
1034 }
1035 sock_put(sk);
1036 atomic_dec(&wanpipe_socks_nr);
1037 return 0;
1038}
1039
1040/*============================================================
1041 * check_write_queue
1042 *
1043 * During sock shutdown, if the sock state is
1044 * WANSOCK_CONNECTED and there is transmit data
1045 * pending. Wait until data is released
1046 * before proceeding.
1047 *===========================================================*/
1048
1049static void check_write_queue(struct sock *sk)
1050{
1051
1052 if (sk->sk_state != WANSOCK_CONNECTED)
1053 return;
1054
1055 if (!atomic_read(&sk->sk_wmem_alloc))
1056 return;
1057
1058 printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n");
1059
1060}
1061
1062/*============================================================
1063 * release_driver
1064 *
1065 * This function is called during sock shutdown, to
1066 * release any resources and links that bind the sock
1067 * to the driver. It also changes the state of the
1068 * sock to WANSOCK_DISCONNECTED
1069 *===========================================================*/
1070
1071static void release_driver(struct sock *sk)
1072{
1073 wanpipe_opt *wp;
1074 struct sk_buff *skb=NULL;
1075 struct sock *deadsk=NULL;
1076
1077 if (sk->sk_state == WANSOCK_LISTEN ||
1078 sk->sk_state == WANSOCK_BIND_LISTEN) {
1079 while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
1080 if ((deadsk = get_newsk_from_skb(skb))){
1081 DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n");
1082 sock_set_flag(deadsk, SOCK_DEAD);
1083 start_cleanup_timer(deadsk);
1084 }
1085 kfree_skb(skb);
1086 }
1087 if (sock_flag(sk, SOCK_ZAPPED))
1088 wanpipe_unlink_card(sk);
1089 }else{
1090 if (sock_flag(sk, SOCK_ZAPPED))
1091 wanpipe_unlink_driver(sk);
1092 }
1093 sk->sk_state = WANSOCK_DISCONNECTED;
1094 sk->sk_bound_dev_if = 0;
1095 sock_reset_flag(sk, SOCK_ZAPPED);
1096 wp = wp_sk(sk);
1097
1098 if (wp) {
1099 kfree(wp->mbox);
1100 wp->mbox = NULL;
1101 }
1102}
1103
1104/*============================================================
1105 * start_cleanup_timer
1106 *
1107 * If new incoming call's are pending but the socket
1108 * is being released, start the timer which will
1109 * envoke the kill routines for pending socks.
1110 *===========================================================*/
1111
1112
1113static void start_cleanup_timer (struct sock *sk)
1114{
1115 del_timer(&sk->sk_timer);
1116 sk->sk_timer.data = (unsigned long)sk;
1117 sk->sk_timer.expires = jiffies + HZ;
1118 sk->sk_timer.function = wanpipe_kill_sock_timer;
1119 add_timer(&sk->sk_timer);
1120}
1121
1122
1123/*============================================================
1124 * wanpipe_kill_sock
1125 *
1126 * This is a function which performs actual killing
1127 * of the sock. It releases socket resources,
1128 * and unlinks the sock from the driver.
1129 *===========================================================*/
1130
1131static void wanpipe_kill_sock_timer (unsigned long data)
1132{
1133
1134 struct sock *sk = (struct sock *)data;
1135 struct sock **skp;
1136
1137 if (!sk)
1138 return;
1139
1140 /* This function can be called from interrupt. We must use
1141 * appropriate locks */
1142
1143 if (test_bit(1,&wanpipe_tx_critical)){
1144 sk->sk_timer.expires = jiffies + 10;
1145 add_timer(&sk->sk_timer);
1146 return;
1147 }
1148
1149 write_lock(&wanpipe_sklist_lock);
1150 sk_del_node_init(sk);
1151 write_unlock(&wanpipe_sklist_lock);
1152
1153
1154 if (wp_sk(sk)->num == htons(X25_PROT) &&
1155 sk->sk_state != WANSOCK_DISCONNECTED) {
1156 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
1157 wanpipe_common_t *chan;
1158 if (dev){
1159 chan=dev->priv;
1160 atomic_set(&chan->disconnect,1);
1161 dev_put(dev);
1162 }
1163 }
1164
1165 release_driver(sk);
1166
1167 sk->sk_socket = NULL;
1168
1169 /* Purge queues */
1170 skb_queue_purge(&sk->sk_receive_queue);
1171 skb_queue_purge(&sk->sk_write_queue);
1172 skb_queue_purge(&sk->sk_error_queue);
1173
1174 if (atomic_read(&sk->sk_rmem_alloc) ||
1175 atomic_read(&sk->sk_wmem_alloc)) {
1176 del_timer(&sk->sk_timer);
1177 printk(KERN_INFO "wansock: Killing SOCK in Timer\n");
1178 sk->sk_timer.data = (unsigned long)sk;
1179 sk->sk_timer.expires = jiffies + HZ;
1180 sk->sk_timer.function = wanpipe_destroy_timer;
1181 add_timer(&sk->sk_timer);
1182 return;
1183 }
1184
1185 kfree(wp_sk(sk));
1186 wp_sk(sk) = NULL;
1187
1188 if (atomic_read(&sk->sk_refcnt) != 1) {
1189 atomic_set(&sk->sk_refcnt, 1);
1190 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
1191 atomic_read(&sk->sk_refcnt));
1192 }
1193 sock_put(sk);
1194 atomic_dec(&wanpipe_socks_nr);
1195 return;
1196}
1197
1198static void wanpipe_kill_sock_accept (struct sock *sk)
1199{
1200
1201 struct sock **skp;
1202
1203 if (!sk)
1204 return;
1205
1206 /* This function can be called from interrupt. We must use
1207 * appropriate locks */
1208
1209 write_lock(&wanpipe_sklist_lock);
1210 sk_del_node_init(sk);
1211 write_unlock(&wanpipe_sklist_lock);
1212
1213 sk->sk_socket = NULL;
1214
1215
1216 kfree(wp_sk(sk));
1217 wp_sk(sk) = NULL;
1218
1219 if (atomic_read(&sk->sk_refcnt) != 1) {
1220 atomic_set(&sk->sk_refcnt, 1);
1221 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n",
1222 atomic_read(&sk->sk_refcnt));
1223 }
1224 sock_put(sk);
1225 atomic_dec(&wanpipe_socks_nr);
1226 return;
1227}
1228
1229
1230static void wanpipe_kill_sock_irq (struct sock *sk)
1231{
1232
1233 if (!sk)
1234 return;
1235
1236 sk->sk_socket = NULL;
1237
1238 kfree(wp_sk(sk));
1239 wp_sk(sk) = NULL;
1240
1241 if (atomic_read(&sk->sk_refcnt) != 1) {
1242 atomic_set(&sk->sk_refcnt, 1);
1243 DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n",
1244 atomic_read(&sk->sk_refcnt));
1245 }
1246 sock_put(sk);
1247 atomic_dec(&wanpipe_socks_nr);
1248}
1249
1250
1251/*============================================================
1252 * wanpipe_do_bind
1253 *
1254 * Bottom half of the binding system call.
1255 * Once the wanpipe_bind() function checks the
1256 * legality of the call, this function binds the
1257 * sock to the driver.
1258 *===========================================================*/
1259
1260static int wanpipe_do_bind(struct sock *sk, struct net_device *dev,
1261 int protocol)
1262{
1263 wanpipe_opt *wp = wp_sk(sk);
1264 wanpipe_common_t *chan=NULL;
1265 int err=0;
1266
1267 if (sock_flag(sk, SOCK_ZAPPED)) {
1268 err = -EALREADY;
1269 goto bind_unlock_exit;
1270 }
1271
1272 wp->num = protocol;
1273
1274 if (protocol == 0){
1275 release_device(dev);
1276 err = -EINVAL;
1277 goto bind_unlock_exit;
1278 }
1279
1280 if (dev) {
1281 if (dev->flags&IFF_UP) {
1282 chan=dev->priv;
1283 sk->sk_state = chan->state;
1284
1285 if (wp->num == htons(X25_PROT) &&
1286 sk->sk_state != WANSOCK_DISCONNECTED &&
1287 sk->sk_state != WANSOCK_CONNECTING) {
1288 DBG_PRINTK(KERN_INFO
1289 "wansock: Binding to Device not DISCONNECTED %i\n",
1290 sk->sk_state);
1291 release_device(dev);
1292 err = -EAGAIN;
1293 goto bind_unlock_exit;
1294 }
1295
1296 wanpipe_link_driver(dev,sk);
1297 sk->sk_bound_dev_if = dev->ifindex;
1298
1299 /* X25 Specific option */
1300 if (wp->num == htons(X25_PROT))
1301 wp_sk(sk)->svc = chan->svc;
1302
1303 } else {
1304 sk->sk_err = ENETDOWN;
1305 sk->sk_error_report(sk);
1306 release_device(dev);
1307 err = -EINVAL;
1308 }
1309 } else {
1310 err = -ENODEV;
1311 }
1312bind_unlock_exit:
1313 /* FIXME where is this lock */
1314
1315 return err;
1316}
1317
1318/*============================================================
1319 * wanpipe_bind
1320 *
1321 * BIND() System call, which is bound to the AF_WANPIPE
1322 * operations structure. It checks for correct wanpipe
1323 * card name, and cross references interface names with
1324 * the card names. Thus, interface name must belong to
1325 * the actual card.
1326 *===========================================================*/
1327
1328
1329static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
1330{
1331 struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
1332 struct sock *sk=sock->sk;
1333 wanpipe_opt *wp = wp_sk(sk);
1334 struct net_device *dev = NULL;
1335 sdla_t *card=NULL;
1336 char name[15];
1337
1338 /*
1339 * Check legality
1340 */
1341
1342 if (addr_len < sizeof(struct wan_sockaddr_ll)){
1343 printk(KERN_INFO "wansock: Address length error\n");
1344 return -EINVAL;
1345 }
1346 if (sll->sll_family != AF_WANPIPE){
1347 printk(KERN_INFO "wansock: Illegal family name specified.\n");
1348 return -EINVAL;
1349 }
1350
1351 card = wanpipe_find_card (sll->sll_card);
1352 if (!card){
1353 printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card);
1354 return -ENODEV;
1355 }else{
1356 wp_sk(sk)->card = (void *)card;
1357 }
1358
1359 if (!strcmp(sll->sll_device,"svc_listen")){
1360
1361 /* Bind a sock to a card structure for listening
1362 */
1363 int err=0;
1364
1365 /* This is x25 specific area if protocol doesn't
1366 * match, return error */
1367 if (sll->sll_protocol != htons(X25_PROT))
1368 return -EINVAL;
1369
1370 err= wanpipe_link_card (sk);
1371 if (err < 0)
1372 return err;
1373
1374 if (sll->sll_protocol)
1375 wp->num = sll->sll_protocol;
1376 sk->sk_state = WANSOCK_BIND_LISTEN;
1377 return 0;
1378
1379 }else if (!strcmp(sll->sll_device,"svc_connect")){
1380
1381 /* This is x25 specific area if protocol doesn't
1382 * match, return error */
1383 if (sll->sll_protocol != htons(X25_PROT))
1384 return -EINVAL;
1385
1386 /* Find a free device
1387 */
1388 dev = wanpipe_find_free_dev(card);
1389 if (dev == NULL){
1390 DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n",
1391 card->devname);
1392 return -EINVAL;
1393 }
1394 }else{
1395 /* Bind a socket to a interface name
1396 * This is used by PVC mostly
1397 */
1398 strlcpy(name,sll->sll_device,sizeof(name));
1399 dev = dev_get_by_name(name);
1400 if (dev == NULL){
1401 printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n",
1402 name);
1403 return -ENODEV;
1404 }
1405
1406 dev_put(dev);
1407
1408 if (check_dev(dev, card)){
1409 printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n",
1410 dev->name, card->devname);
1411 return -EINVAL;
1412 }
1413 if (get_atomic_device (dev))
1414 return -EINVAL;
1415 }
1416
1417 return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num);
1418}
1419
1420/*============================================================
1421 * get_atomic_device
1422 *
1423 * Sets a bit atomically which indicates that
1424 * the interface is taken. This avoids race conditions.
1425 *===========================================================*/
1426
1427
1428static inline int get_atomic_device(struct net_device *dev)
1429{
1430 wanpipe_common_t *chan = dev->priv;
1431 if (!test_and_set_bit(0,(void *)&chan->rw_bind)){
1432 return 0;
1433 }
1434 return 1;
1435}
1436
1437/*============================================================
1438 * check_dev
1439 *
1440 * Check that device name belongs to a particular card.
1441 *===========================================================*/
1442
1443static int check_dev(struct net_device *dev, sdla_t *card)
1444{
1445 struct net_device* tmp_dev;
1446
1447 for (tmp_dev = card->wandev.dev; tmp_dev;
1448 tmp_dev = *((struct net_device **)tmp_dev->priv)) {
1449 if (tmp_dev->ifindex == dev->ifindex){
1450 return 0;
1451 }
1452 }
1453 return 1;
1454}
1455
1456/*============================================================
1457 * wanpipe_find_free_dev
1458 *
1459 * Find a free network interface. If found set atomic
1460 * bit indicating that the interface is taken.
1461 * X25API Specific.
1462 *===========================================================*/
1463
1464struct net_device *wanpipe_find_free_dev(sdla_t *card)
1465{
1466 struct net_device* dev;
1467 volatile wanpipe_common_t *chan;
1468
1469 if (test_and_set_bit(0,&find_free_critical)){
1470 printk(KERN_INFO "CRITICAL in Find Free\n");
1471 }
1472
1473 for (dev = card->wandev.dev; dev;
1474 dev = *((struct net_device **)dev->priv)) {
1475 chan = dev->priv;
1476 if (!chan)
1477 continue;
1478 if (chan->usedby == API && chan->svc){
1479 if (!get_atomic_device (dev)){
1480 if (chan->state != WANSOCK_DISCONNECTED){
1481 release_device(dev);
1482 }else{
1483 clear_bit(0,&find_free_critical);
1484 return dev;
1485 }
1486 }
1487 }
1488 }
1489 clear_bit(0,&find_free_critical);
1490 return NULL;
1491}
1492
1493/*============================================================
1494 * wanpipe_create
1495 *
1496 * SOCKET() System call. It allocates a sock structure
1497 * and adds the socket to the wanpipe_sk_list.
1498 * Crates AF_WANPIPE socket.
1499 *===========================================================*/
1500
1501static int wanpipe_create(struct socket *sock, int protocol)
1502{
1503 struct sock *sk;
1504
1505 //FIXME: This checks for root user, SECURITY ?
1506 //if (!capable(CAP_NET_RAW))
1507 // return -EPERM;
1508
1509 if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW)
1510 return -ESOCKTNOSUPPORT;
1511
1512 sock->state = SS_UNCONNECTED;
1513
1514 if ((sk = wanpipe_alloc_socket()) == NULL)
1515 return -ENOBUFS;
1516
1517 sk->sk_reuse = 1;
1518 sock->ops = &wanpipe_ops;
1519 sock_init_data(sock,sk);
1520
1521 sock_reset_flag(sk, SOCK_ZAPPED);
1522 sk->sk_family = PF_WANPIPE;
1523 wp_sk(sk)->num = protocol;
1524 sk->sk_state = WANSOCK_DISCONNECTED;
1525 sk->sk_ack_backlog = 0;
1526 sk->sk_bound_dev_if = 0;
1527
1528 atomic_inc(&wanpipe_socks_nr);
1529
1530 /* We must disable interrupts because the ISR
1531 * can also change the list */
1532 set_bit(1,&wanpipe_tx_critical);
1533 write_lock(&wanpipe_sklist_lock);
1534 sk_add_node(sk, &wanpipe_sklist);
1535 write_unlock(&wanpipe_sklist_lock);
1536 clear_bit(1,&wanpipe_tx_critical);
1537
1538 return(0);
1539}
1540
1541
1542/*============================================================
1543 * wanpipe_recvmsg
1544 *
1545 * Pull a packet from our receive queue and hand it
1546 * to the user. If necessary we block.
1547 *===========================================================*/
1548
1549static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock,
1550 struct msghdr *msg, int len, int flags)
1551{
1552 struct sock *sk = sock->sk;
1553 struct sk_buff *skb;
1554 int copied, err=-ENOBUFS;
1555
1556
1557 /*
1558 * If the address length field is there to be filled in, we fill
1559 * it in now.
1560 */
1561
1562 msg->msg_namelen = sizeof(struct wan_sockaddr_ll);
1563
1564 /*
1565 * Call the generic datagram receiver. This handles all sorts
1566 * of horrible races and re-entrancy so we can forget about it
1567 * in the protocol layers.
1568 *
1569 * Now it will return ENETDOWN, if device have just gone down,
1570 * but then it will block.
1571 */
1572
1573 if (flags & MSG_OOB){
1574 skb = skb_dequeue(&sk->sk_error_queue);
1575 }else{
1576 skb=skb_recv_datagram(sk,flags,1,&err);
1577 }
1578 /*
1579 * An error occurred so return it. Because skb_recv_datagram()
1580 * handles the blocking we don't see and worry about blocking
1581 * retries.
1582 */
1583
1584 if(skb==NULL)
1585 goto out;
1586
1587 /*
1588 * You lose any data beyond the buffer you gave. If it worries a
1589 * user program they can ask the device for its MTU anyway.
1590 */
1591
1592 copied = skb->len;
1593 if (copied > len)
1594 {
1595 copied=len;
1596 msg->msg_flags|=MSG_TRUNC;
1597 }
1598
1599 wanpipe_wakeup_driver(sk);
1600
1601 /* We can't use skb_copy_datagram here */
1602 err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
1603 if (err)
1604 goto out_free;
1605
1606 sock_recv_timestamp(msg, sk, skb);
1607
1608 if (msg->msg_name)
1609 memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
1610
1611 /*
1612 * Free or return the buffer as appropriate. Again this
1613 * hides all the races and re-entrancy issues from us.
1614 */
1615 err = (flags&MSG_TRUNC) ? skb->len : copied;
1616
1617out_free:
1618 skb_free_datagram(sk, skb);
1619out:
1620 return err;
1621}
1622
1623
1624/*============================================================
1625 * wanpipe_wakeup_driver
1626 *
1627 * If socket receive buffer is full and driver cannot
1628 * pass data up the sock, it sets a packet_block flag.
1629 * This function check that flag and if sock receive
1630 * queue has room it kicks the driver BH handler.
1631 *
1632 * This way, driver doesn't have to poll the sock
1633 * receive queue.
1634 *===========================================================*/
1635
1636static void wanpipe_wakeup_driver(struct sock *sk)
1637{
1638 struct net_device *dev = NULL;
1639 wanpipe_common_t *chan=NULL;
1640
1641 dev = dev_get_by_index(sk->sk_bound_dev_if);
1642 if (!dev)
1643 return;
1644
1645 dev_put(dev);
1646
1647 if ((chan = dev->priv) == NULL)
1648 return;
1649
1650 if (atomic_read(&chan->receive_block)){
1651 if (atomic_read(&sk->sk_rmem_alloc) <
1652 ((unsigned)sk->sk_rcvbuf * 0.9)) {
1653 printk(KERN_INFO "wansock: Queuing task for wanpipe\n");
1654 atomic_set(&chan->receive_block,0);
1655 wanpipe_queue_tq(&chan->wanpipe_task);
1656 wanpipe_mark_bh();
1657 }
1658 }
1659}
1660
1661/*============================================================
1662 * wanpipe_getname
1663 *
1664 * I don't know what to do with this yet.
1665 * User can use this function to get sock address
1666 * information. Not very useful for Sangoma's purposes.
1667 *===========================================================*/
1668
1669
1670static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr,
1671 int *uaddr_len, int peer)
1672{
1673 struct net_device *dev;
1674 struct sock *sk = sock->sk;
1675 struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr;
1676
1677 sll->sll_family = AF_WANPIPE;
1678 sll->sll_ifindex = sk->sk_bound_dev_if;
1679 sll->sll_protocol = wp_sk(sk)->num;
1680 dev = dev_get_by_index(sk->sk_bound_dev_if);
1681 if (dev) {
1682 sll->sll_hatype = dev->type;
1683 sll->sll_halen = dev->addr_len;
1684 memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len);
1685 } else {
1686 sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */
1687 sll->sll_halen = 0;
1688 }
1689 *uaddr_len = sizeof(*sll);
1690
1691 dev_put(dev);
1692
1693 return 0;
1694}
1695
1696/*============================================================
1697 * wanpipe_notifier
1698 *
1699 * If driver turns off network interface, this function
1700 * will be envoked. Currently I treate it as a
1701 * call disconnect. More thought should go into this
1702 * function.
1703 *
1704 * FIXME: More thought should go into this function.
1705 *
1706 *===========================================================*/
1707
1708static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data)
1709{
1710 struct sock *sk;
1711 hlist_node *node;
1712 struct net_device *dev = (struct net_device *)data;
1713
1714 sk_for_each(sk, node, &wanpipe_sklist) {
1715 struct wanpipe_opt *po = wp_sk(sk);
1716
1717 if (!po)
1718 continue;
1719 if (dev == NULL)
1720 continue;
1721
1722 switch (msg) {
1723 case NETDEV_DOWN:
1724 case NETDEV_UNREGISTER:
1725 if (dev->ifindex == sk->sk_bound_dev_if) {
1726 printk(KERN_INFO "wansock: Device down %s\n",dev->name);
1727 if (sock_flag(sk, SOCK_ZAPPED)) {
1728 wanpipe_unlink_driver(sk);
1729 sk->sk_err = ENETDOWN;
1730 sk->sk_error_report(sk);
1731 }
1732
1733 if (msg == NETDEV_UNREGISTER) {
1734 printk(KERN_INFO "wansock: Unregistering Device: %s\n",
1735 dev->name);
1736 wanpipe_unlink_driver(sk);
1737 sk->sk_bound_dev_if = 0;
1738 }
1739 }
1740 break;
1741 case NETDEV_UP:
1742 if (dev->ifindex == sk->sk_bound_dev_if &&
1743 po->num && !sock_flag(sk, SOCK_ZAPPED)) {
1744 printk(KERN_INFO "wansock: Registering Device: %s\n",
1745 dev->name);
1746 wanpipe_link_driver(dev,sk);
1747 }
1748 break;
1749 }
1750 }
1751 return NOTIFY_DONE;
1752}
1753
1754/*============================================================
1755 * wanpipe_ioctl
1756 *
1757 * Execute a user commands, and set socket options.
1758 *
1759 * FIXME: More thought should go into this function.
1760 *
1761 *===========================================================*/
1762
1763static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
1764{
1765 struct sock *sk = sock->sk;
1766 int err;
1767
1768 switch(cmd)
1769 {
1770 case SIOCGSTAMP:
1771 return sock_get_timestamp(sk, (struct timeval __user *)arg);
1772
1773 case SIOC_WANPIPE_CHECK_TX:
1774
1775 return atomic_read(&sk->sk_wmem_alloc);
1776
1777 case SIOC_WANPIPE_SOCK_STATE:
1778
1779 if (sk->sk_state == WANSOCK_CONNECTED)
1780 return 0;
1781
1782 return 1;
1783
1784
1785 case SIOC_WANPIPE_GET_CALL_DATA:
1786
1787 return get_ioctl_cmd (sk,(void*)arg);
1788
1789 case SIOC_WANPIPE_SET_CALL_DATA:
1790
1791 return set_ioctl_cmd (sk,(void*)arg);
1792
1793 case SIOC_WANPIPE_ACCEPT_CALL:
1794 case SIOC_WANPIPE_CLEAR_CALL:
1795 case SIOC_WANPIPE_RESET_CALL:
1796
1797 if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0)
1798 return err;
1799
1800 err=wanpipe_exec_cmd(sk,cmd,0);
1801 get_ioctl_cmd(sk,(void*)arg);
1802 return err;
1803
1804 case SIOC_WANPIPE_DEBUG:
1805
1806 return wanpipe_debug(sk,(void*)arg);
1807
1808 case SIOC_WANPIPE_SET_NONBLOCK:
1809
1810 if (sk->sk_state != WANSOCK_DISCONNECTED)
1811 return -EINVAL;
1812
1813 sock->file->f_flags |= O_NONBLOCK;
1814 return 0;
1815
1816#ifdef CONFIG_INET
1817 case SIOCADDRT:
1818 case SIOCDELRT:
1819 case SIOCDARP:
1820 case SIOCGARP:
1821 case SIOCSARP:
1822 case SIOCDRARP:
1823 case SIOCGRARP:
1824 case SIOCSRARP:
1825 case SIOCGIFADDR:
1826 case SIOCSIFADDR:
1827 case SIOCGIFBRDADDR:
1828 case SIOCSIFBRDADDR:
1829 case SIOCGIFNETMASK:
1830 case SIOCSIFNETMASK:
1831 case SIOCGIFDSTADDR:
1832 case SIOCSIFDSTADDR:
1833 case SIOCSIFFLAGS:
1834 return inet_dgram_ops.ioctl(sock, cmd, arg);
1835#endif
1836
1837 default:
1838 return -ENOIOCTLCMD;
1839 }
1840 /*NOTREACHED*/
1841}
1842
1843/*============================================================
1844 * wanpipe_debug
1845 *
1846 * This function will pass up information about all
1847 * active sockets.
1848 *
1849 * FIXME: More thought should go into this function.
1850 *
1851 *===========================================================*/
1852
1853static int wanpipe_debug (struct sock *origsk, void *arg)
1854{
1855 struct sock *sk;
1856 struct hlist_node *node;
1857 struct net_device *dev = NULL;
1858 wanpipe_common_t *chan=NULL;
1859 int cnt=0, err=0;
1860 wan_debug_t *dbg_data = (wan_debug_t *)arg;
1861
1862 sk_for_each(sk, node, &wanpipe_sklist) {
1863 wanpipe_opt *wp = wp_sk(sk);
1864
1865 if (sk == origsk){
1866 continue;
1867 }
1868
1869 if ((err=put_user(1, &dbg_data->debug[cnt].free)))
1870 return err;
1871 if ((err = put_user(sk->sk_state,
1872 &dbg_data->debug[cnt].state_sk)))
1873 return err;
1874 if ((err = put_user(sk->sk_rcvbuf,
1875 &dbg_data->debug[cnt].rcvbuf)))
1876 return err;
1877 if ((err = put_user(atomic_read(&sk->sk_rmem_alloc),
1878 &dbg_data->debug[cnt].rmem)))
1879 return err;
1880 if ((err = put_user(atomic_read(&sk->sk_wmem_alloc),
1881 &dbg_data->debug[cnt].wmem)))
1882 return err;
1883 if ((err = put_user(sk->sk_sndbuf,
1884 &dbg_data->debug[cnt].sndbuf)))
1885 return err;
1886 if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count)))
1887 return err;
1888 if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt)))
1889 return err;
1890 if ((err = put_user(sk->sk_bound_dev_if,
1891 &dbg_data->debug[cnt].bound)))
1892 return err;
1893
1894 if (sk->sk_bound_dev_if) {
1895 dev = dev_get_by_index(sk->sk_bound_dev_if);
1896 if (!dev)
1897 continue;
1898
1899 chan=dev->priv;
1900 dev_put(dev);
1901
1902 if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state)))
1903 return err;
1904 if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc)))
1905 return err;
1906
1907 if ((err=put_user(atomic_read(&chan->command),
1908 &dbg_data->debug[cnt].command)))
1909 return err;
1910
1911
1912 if (wp){
1913 sdla_t *card = (sdla_t*)wp->card;
1914
1915 if (card){
1916 if ((err=put_user(atomic_read(&card->u.x.command_busy),
1917 &dbg_data->debug[cnt].cmd_busy)))
1918 return err;
1919 }
1920
1921 if ((err=put_user(wp->lcn,
1922 &dbg_data->debug[cnt].lcn)))
1923 return err;
1924
1925 if (wp->mbox) {
1926 if ((err=put_user(1, &dbg_data->debug[cnt].mbox)))
1927 return err;
1928 }
1929 }
1930
1931 if ((err=put_user(atomic_read(&chan->receive_block),
1932 &dbg_data->debug[cnt].rblock)))
1933 return err;
1934
1935 if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name)))
1936 return -EFAULT;
1937 }
1938
1939 if (++cnt == MAX_NUM_DEBUG)
1940 break;
1941 }
1942 return 0;
1943}
1944
1945/*============================================================
1946 * get_ioctl_cmd
1947 *
1948 * Pass up the contents of socket MBOX to the user.
1949 *===========================================================*/
1950
1951static int get_ioctl_cmd (struct sock *sk, void *arg)
1952{
1953 x25api_t *usr_data = (x25api_t *)arg;
1954 mbox_cmd_t *mbox_ptr;
1955 int err;
1956
1957 if (usr_data == NULL)
1958 return -EINVAL;
1959
1960 if (!wp_sk(sk)->mbox) {
1961 return -EINVAL;
1962 }
1963
1964 mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox;
1965
1966 if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
1967 return err;
1968 if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
1969 return err;
1970 if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
1971 return err;
1972 if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
1973 return err;
1974 if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
1975 return err;
1976 if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn)))
1977 return err;
1978
1979 if (mbox_ptr->cmd.length > 0){
1980 if (mbox_ptr->cmd.length > X25_MAX_DATA)
1981 return -EINVAL;
1982
1983 if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){
1984 printk(KERN_INFO "wansock: Copy failed !!!\n");
1985 return -EFAULT;
1986 }
1987 }
1988 return 0;
1989}
1990
1991/*============================================================
1992 * set_ioctl_cmd
1993 *
1994 * Before command can be execute, socket MBOX must
1995 * be created, and initialized with user data.
1996 *===========================================================*/
1997
1998static int set_ioctl_cmd (struct sock *sk, void *arg)
1999{
2000 x25api_t *usr_data = (x25api_t *)arg;
2001 mbox_cmd_t *mbox_ptr;
2002 int err;
2003
2004 if (!wp_sk(sk)->mbox) {
2005 void *mbox_ptr;
2006 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
2007 if (!dev)
2008 return -ENODEV;
2009
2010 dev_put(dev);
2011
2012 if ((mbox_ptr = kzalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL)
2013 return -ENOMEM;
2014
2015 wp_sk(sk)->mbox = mbox_ptr;
2016
2017 wanpipe_link_driver(dev,sk);
2018 }
2019
2020 mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox;
2021 memset(mbox_ptr, 0, sizeof(mbox_cmd_t));
2022
2023 if (usr_data == NULL){
2024 return 0;
2025 }
2026 if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm)))
2027 return err;
2028 if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause)))
2029 return err;
2030 if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn)))
2031 return err;
2032 if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length)))
2033 return err;
2034 if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result)))
2035 return err;
2036
2037 if (mbox_ptr->cmd.length > 0){
2038 if (mbox_ptr->cmd.length > X25_MAX_DATA)
2039 return -EINVAL;
2040
2041 if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){
2042 printk(KERN_INFO "Copy failed\n");
2043 return -EFAULT;
2044 }
2045 }
2046 return 0;
2047}
2048
2049
2050/*======================================================================
2051 * wanpipe_poll
2052 *
2053 * Datagram poll: Again totally generic. This also handles
2054 * sequenced packet sockets providing the socket receive queue
2055 * is only ever holding data ready to receive.
2056 *
2057 * Note: when you _don't_ use this routine for this protocol,
2058 * and you use a different write policy from sock_writeable()
2059 * then please supply your own write_space callback.
2060 *=====================================================================*/
2061
2062unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait)
2063{
2064 struct sock *sk = sock->sk;
2065 unsigned int mask;
2066
2067 ++wp_sk(sk)->poll_cnt;
2068
2069 poll_wait(file, sk->sk_sleep, wait);
2070 mask = 0;
2071
2072 /* exceptional events? */
2073 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) {
2074 mask |= POLLPRI;
2075 return mask;
2076 }
2077 if (sk->sk_shutdown & RCV_SHUTDOWN)
2078 mask |= POLLHUP;
2079
2080 /* readable? */
2081 if (!skb_queue_empty(&sk->sk_receive_queue)) {
2082 mask |= POLLIN | POLLRDNORM;
2083 }
2084
2085 /* connection hasn't started yet */
2086 if (sk->sk_state == WANSOCK_CONNECTING) {
2087 return mask;
2088 }
2089
2090 if (sk->sk_state == WANSOCK_DISCONNECTED) {
2091 mask = POLLPRI;
2092 return mask;
2093 }
2094
2095 /* This check blocks the user process if there is
2096 * a packet already queued in the socket write queue.
2097 * This option is only for X25API protocol, for other
2098 * protocol like chdlc enable streaming mode,
2099 * where multiple packets can be pending in the socket
2100 * transmit queue */
2101
2102 if (wp_sk(sk)->num == htons(X25_PROT)) {
2103 if (atomic_read(&wp_sk(sk)->packet_sent))
2104 return mask;
2105 }
2106
2107 /* writable? */
2108 if (sock_writeable(sk)){
2109 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
2110 }else{
2111 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
2112 }
2113
2114 return mask;
2115}
2116
2117/*======================================================================
2118 * wanpipe_listen
2119 *
2120 * X25API Specific function. Set a socket into LISTENING MODE.
2121 *=====================================================================*/
2122
2123
2124static int wanpipe_listen(struct socket *sock, int backlog)
2125{
2126 struct sock *sk = sock->sk;
2127
2128 /* This is x25 specific area if protocol doesn't
2129 * match, return error */
2130 if (wp_sk(sk)->num != htons(X25_PROT))
2131 return -EINVAL;
2132
2133 if (sk->sk_state == WANSOCK_BIND_LISTEN) {
2134
2135 sk->sk_max_ack_backlog = backlog;
2136 sk->sk_state = WANSOCK_LISTEN;
2137 return 0;
2138 }else{
2139 printk(KERN_INFO "wansock: Listening sock was not binded\n");
2140 }
2141
2142 return -EINVAL;
2143}
2144
2145/*======================================================================
2146 * wanpipe_link_card
2147 *
2148 * Connects the listening socket to the driver
2149 *=====================================================================*/
2150
2151static int wanpipe_link_card (struct sock *sk)
2152{
2153 sdla_t *card = (sdla_t*)wp_sk(sk)->card;
2154
2155 if (!card)
2156 return -ENOMEM;
2157
2158 if ((card->sk != NULL) || (card->func != NULL)){
2159 printk(KERN_INFO "wansock: Listening queue is already established\n");
2160 return -EINVAL;
2161 }
2162
2163 card->sk=sk;
2164 card->func=wanpipe_listen_rcv;
2165 sock_set_flag(sk, SOCK_ZAPPED);
2166
2167 return 0;
2168}
2169
2170/*======================================================================
2171 * wanpipe_listen
2172 *
2173 * X25API Specific function. Disconnect listening socket from
2174 * the driver.
2175 *=====================================================================*/
2176
2177static void wanpipe_unlink_card (struct sock *sk)
2178{
2179 sdla_t *card = (sdla_t*)wp_sk(sk)->card;
2180
2181 if (card){
2182 card->sk=NULL;
2183 card->func=NULL;
2184 }
2185}
2186
2187/*======================================================================
2188 * wanpipe_exec_cmd
2189 *
2190 * Ioctl function calls this function to execute user command.
2191 * Connect() sytem call also calls this function to execute
2192 * place call. This function blocks until command is executed.
2193 *=====================================================================*/
2194
2195static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags)
2196{
2197 int err = -EINVAL;
2198 wanpipe_opt *wp = wp_sk(sk);
2199 mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox;
2200
2201 if (!mbox_ptr){
2202 printk(KERN_INFO "NO MBOX PTR !!!!!\n");
2203 return -EINVAL;
2204 }
2205
2206 /* This is x25 specific area if protocol doesn't
2207 * match, return error */
2208 if (wp->num != htons(X25_PROT))
2209 return -EINVAL;
2210
2211
2212 switch (cmd){
2213
2214 case SIOC_WANPIPE_ACCEPT_CALL:
2215
2216 if (sk->sk_state != WANSOCK_CONNECTING) {
2217 err = -EHOSTDOWN;
2218 break;
2219 }
2220
2221 err = execute_command(sk,X25_ACCEPT_CALL,0);
2222 if (err < 0)
2223 break;
2224
2225 /* Update. Mar6 2000.
2226 * Do not set the sock lcn number here, since
2227 * it is done in wanpipe_listen_rcv().
2228 */
2229 if (sk->sk_state == WANSOCK_CONNECTED) {
2230 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
2231 DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n",
2232 wp->lcn);
2233 err = 0;
2234
2235 }else{
2236 DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n",
2237 wp->lcn);
2238 wp->lcn = 0;
2239 err = -ECONNREFUSED;
2240 }
2241 break;
2242
2243 case SIOC_WANPIPE_CLEAR_CALL:
2244
2245 if (sk->sk_state == WANSOCK_DISCONNECTED) {
2246 err = -EINVAL;
2247 break;
2248 }
2249
2250
2251 /* Check if data buffers are pending for transmission,
2252 * if so, check whether user wants to wait until data
2253 * is transmitted, or clear a call and drop packets */
2254
2255 if (atomic_read(&sk->sk_wmem_alloc) ||
2256 check_driver_busy(sk)) {
2257 mbox_cmd_t *mbox = wp->mbox;
2258 if (mbox->cmd.qdm & 0x80){
2259 mbox->cmd.result = 0x35;
2260 err = -EAGAIN;
2261 break;
2262 }
2263 }
2264
2265 sk->sk_state = WANSOCK_DISCONNECTING;
2266
2267 err = execute_command(sk,X25_CLEAR_CALL,0);
2268 if (err < 0)
2269 break;
2270
2271 err = -ECONNREFUSED;
2272 if (sk->sk_state == WANSOCK_DISCONNECTED) {
2273 DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n",
2274 wp->lcn);
2275 wp->lcn = 0;
2276 err = 0;
2277 }
2278 break;
2279
2280 case SIOC_WANPIPE_RESET_CALL:
2281
2282 if (sk->sk_state != WANSOCK_CONNECTED) {
2283 err = -EINVAL;
2284 break;
2285 }
2286
2287
2288 /* Check if data buffers are pending for transmission,
2289 * if so, check whether user wants to wait until data
2290 * is transmitted, or reset a call and drop packets */
2291
2292 if (atomic_read(&sk->sk_wmem_alloc) ||
2293 check_driver_busy(sk)) {
2294 mbox_cmd_t *mbox = wp->mbox;
2295 if (mbox->cmd.qdm & 0x80){
2296 mbox->cmd.result = 0x35;
2297 err = -EAGAIN;
2298 break;
2299 }
2300 }
2301
2302
2303 err = execute_command(sk, X25_RESET,0);
2304 if (err < 0)
2305 break;
2306
2307 err = mbox_ptr->cmd.result;
2308 break;
2309
2310
2311 case X25_PLACE_CALL:
2312
2313 err=execute_command(sk,X25_PLACE_CALL,flags);
2314 if (err < 0)
2315 break;
2316
2317 if (sk->sk_state == WANSOCK_CONNECTED) {
2318
2319 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
2320
2321 DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n",
2322 wp->lcn);
2323 err = 0;
2324
2325 } else if (sk->sk_state == WANSOCK_CONNECTING &&
2326 (flags & O_NONBLOCK)) {
2327 wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn;
2328 DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n",
2329 wp->lcn);
2330
2331 err = 0;
2332
2333 }else{
2334 DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n");
2335 err = -ECONNREFUSED;
2336 }
2337
2338 break;
2339
2340 default:
2341 return -EINVAL;
2342 }
2343
2344 return err;
2345}
2346
2347static int check_driver_busy (struct sock *sk)
2348{
2349 struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if);
2350 wanpipe_common_t *chan;
2351
2352 if (!dev)
2353 return 0;
2354
2355 dev_put(dev);
2356
2357 if ((chan=dev->priv) == NULL)
2358 return 0;
2359
2360 return atomic_read(&chan->driver_busy);
2361}
2362
2363
2364/*======================================================================
2365 * wanpipe_accept
2366 *
2367 * ACCEPT() System call. X25API Specific function.
2368 * For each incoming call, create a new socket and
2369 * return it to the user.
2370 *=====================================================================*/
2371
2372static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags)
2373{
2374 struct sock *sk;
2375 struct sock *newsk;
2376 struct sk_buff *skb;
2377 DECLARE_WAITQUEUE(wait, current);
2378 int err=0;
2379
2380 if (newsock->sk != NULL){
2381 wanpipe_kill_sock_accept(newsock->sk);
2382 newsock->sk=NULL;
2383 }
2384
2385 if ((sk = sock->sk) == NULL)
2386 return -EINVAL;
2387
2388 if (sk->sk_type != SOCK_RAW)
2389 return -EOPNOTSUPP;
2390
2391 if (sk->sk_state != WANSOCK_LISTEN)
2392 return -EINVAL;
2393
2394 if (wp_sk(sk)->num != htons(X25_PROT))
2395 return -EINVAL;
2396
2397 add_wait_queue(sk->sk_sleep,&wait);
2398 current->state = TASK_INTERRUPTIBLE;
2399 for (;;){
2400 skb = skb_dequeue(&sk->sk_receive_queue);
2401 if (skb){
2402 err=0;
2403 break;
2404 }
2405 if (signal_pending(current)) {
2406 err = -ERESTARTSYS;
2407 break;
2408 }
2409 schedule();
2410 }
2411 current->state = TASK_RUNNING;
2412 remove_wait_queue(sk->sk_sleep,&wait);
2413
2414 if (err != 0)
2415 return err;
2416
2417 newsk = get_newsk_from_skb(skb);
2418 if (!newsk){
2419 return -EINVAL;
2420 }
2421
2422 set_bit(1,&wanpipe_tx_critical);
2423 write_lock(&wanpipe_sklist_lock);
2424 sk_add_node(newsk, &wanpipe_sklist);
2425 write_unlock(&wanpipe_sklist_lock);
2426 clear_bit(1,&wanpipe_tx_critical);
2427
2428 newsk->sk_socket = newsock;
2429 newsk->sk_sleep = &newsock->wait;
2430
2431 /* Now attach up the new socket */
2432 sk->sk_ack_backlog--;
2433 newsock->sk = newsk;
2434
2435 kfree_skb(skb);
2436
2437 DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n",
2438 wp_sk(newsk)->lcn);
2439 return 0;
2440}
2441
2442/*======================================================================
2443 * get_newsk_from_skb
2444 *
2445 * Accept() uses this function to get the address of the new
2446 * socket structure.
2447 *=====================================================================*/
2448
2449struct sock * get_newsk_from_skb (struct sk_buff *skb)
2450{
2451 struct net_device *dev = skb->dev;
2452 wanpipe_common_t *chan;
2453
2454 if (!dev){
2455 return NULL;
2456 }
2457
2458 if ((chan = dev->priv) == NULL){
2459 return NULL;
2460 }
2461
2462 if (!chan->sk){
2463 return NULL;
2464 }
2465 return (struct sock *)chan->sk;
2466}
2467
2468/*======================================================================
2469 * wanpipe_connect
2470 *
2471 * CONNECT() System Call. X25API specific function
2472 * Check the state of the sock, and execute PLACE_CALL command.
2473 * Connect can ether block or return without waiting for connection,
2474 * if specified by user.
2475 *=====================================================================*/
2476
2477static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags)
2478{
2479 struct sock *sk = sock->sk;
2480 struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr;
2481 struct net_device *dev;
2482 int err;
2483
2484 if (wp_sk(sk)->num != htons(X25_PROT))
2485 return -EINVAL;
2486
2487 if (sk->sk_state == WANSOCK_CONNECTED)
2488 return -EISCONN; /* No reconnect on a seqpacket socket */
2489
2490 if (sk->sk_state != WAN_DISCONNECTED) {
2491 printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n");
2492 return -ECONNREFUSED;
2493 }
2494
2495 sk->sk_state = WANSOCK_DISCONNECTED;
2496 sock->state = SS_UNCONNECTED;
2497
2498 if (addr_len != sizeof(struct wan_sockaddr_ll))
2499 return -EINVAL;
2500
2501 if (addr->sll_family != AF_WANPIPE)
2502 return -EINVAL;
2503
2504 if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL)
2505 return -ENETUNREACH;
2506
2507 dev_put(dev);
2508
2509 if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */
2510 return -EINVAL;
2511
2512 sock->state = SS_CONNECTING;
2513 sk->sk_state = WANSOCK_CONNECTING;
2514
2515 if (!wp_sk(sk)->mbox) {
2516 if (wp_sk (sk)->svc)
2517 return -EINVAL;
2518 else {
2519 int err;
2520 if ((err=set_ioctl_cmd(sk,NULL)) < 0)
2521 return err;
2522 }
2523 }
2524
2525 if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){
2526 sock->state = SS_UNCONNECTED;
2527 sk->sk_state = WANSOCK_CONNECTED;
2528 return err;
2529 }
2530
2531 if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) {
2532 return 0;
2533 }
2534
2535 if (sk->sk_state != WANSOCK_CONNECTED) {
2536 sock->state = SS_UNCONNECTED;
2537 return -ECONNREFUSED;
2538 }
2539
2540 sock->state = SS_CONNECTED;
2541 return 0;
2542}
2543
2544const struct proto_ops wanpipe_ops = {
2545 .family = PF_WANPIPE,
2546 .owner = THIS_MODULE,
2547 .release = wanpipe_release,
2548 .bind = wanpipe_bind,
2549 .connect = wanpipe_connect,
2550 .socketpair = sock_no_socketpair,
2551 .accept = wanpipe_accept,
2552 .getname = wanpipe_getname,
2553 .poll = wanpipe_poll,
2554 .ioctl = wanpipe_ioctl,
2555 .listen = wanpipe_listen,
2556 .shutdown = sock_no_shutdown,
2557 .setsockopt = sock_no_setsockopt,
2558 .getsockopt = sock_no_getsockopt,
2559 .sendmsg = wanpipe_sendmsg,
2560 .recvmsg = wanpipe_recvmsg
2561};
2562
2563static struct net_proto_family wanpipe_family_ops = {
2564 .family = PF_WANPIPE,
2565 .create = wanpipe_create,
2566 .owner = THIS_MODULE,
2567};
2568
2569struct notifier_block wanpipe_netdev_notifier = {
2570 .notifier_call = wanpipe_notifier,
2571};
2572
2573
2574#ifdef MODULE
2575void cleanup_module(void)
2576{
2577 printk(KERN_INFO "wansock: Cleaning up \n");
2578 unregister_netdevice_notifier(&wanpipe_netdev_notifier);
2579 sock_unregister(PF_WANPIPE);
2580 proto_unregister(&wanpipe_proto);
2581}
2582
2583int init_module(void)
2584{
2585 int rc;
2586
2587 printk(KERN_INFO "wansock: Registering Socket \n");
2588
2589 rc = proto_register(&wanpipe_proto, 0);
2590 if (rc != 0)
2591 goto out;
2592
2593 sock_register(&wanpipe_family_ops);
2594 register_netdevice_notifier(&wanpipe_netdev_notifier);
2595out:
2596 return rc;
2597}
2598#endif
2599MODULE_LICENSE("GPL");
2600MODULE_ALIAS_NETPROTO(PF_WANPIPE);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-28 07:09:12 -0500