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1da177e4 LT |
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/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/wanpipe.h> | |
58 | #include <linux/if_wanpipe.h> | |
59 | #include <linux/pkt_sched.h> | |
c752f073 | 60 | #include <linux/tcp_states.h> |
1da177e4 LT |
61 | #include <linux/if_wanpipe_common.h> |
62 | #include <linux/sdla_x25.h> | |
63 | ||
64 | #ifdef CONFIG_INET | |
65 | #include <net/inet_common.h> | |
66 | #endif | |
67 | ||
68 | #define SLOW_BACKOFF 0.1*HZ | |
69 | #define FAST_BACKOFF 0.01*HZ | |
70 | ||
71 | //#define PRINT_DEBUG | |
72 | #ifdef PRINT_DEBUG | |
73 | #define DBG_PRINTK(format, a...) printk(format, ## a) | |
74 | #else | |
75 | #define DBG_PRINTK(format, a...) | |
76 | #endif | |
77 | ||
78 | ||
79 | /* SECURE SOCKET IMPLEMENTATION | |
80 | * | |
81 | * TRANSMIT: | |
82 | * | |
83 | * When the user sends a packet via send() system call | |
84 | * the wanpipe_sendmsg() function is executed. | |
85 | * | |
86 | * Each packet is enqueud into sk->sk_write_queue transmit | |
87 | * queue. When the packet is enqueued, a delayed transmit | |
88 | * timer is triggerd which acts as a Bottom Half hander. | |
89 | * | |
90 | * wanpipe_delay_transmit() function (BH), dequeues packets | |
91 | * from the sk->sk_write_queue transmit queue and sends it | |
92 | * to the deriver via dev->hard_start_xmit(skb, dev) function. | |
93 | * Note, this function is actual a function pointer of if_send() | |
94 | * routine in the wanpipe driver. | |
95 | * | |
96 | * X25API GUARANTEED DELIVERY: | |
97 | * | |
98 | * In order to provide 100% guaranteed packet delivery, | |
99 | * an atomic 'packet_sent' counter is implemented. Counter | |
100 | * is incremented for each packet enqueued | |
101 | * into sk->sk_write_queue. Counter is decremented each | |
102 | * time wanpipe_delayed_transmit() function successfuly | |
103 | * passes the packet to the driver. Before each send(), a poll | |
104 | * routine checks the sock resources The maximum value of | |
105 | * packet sent counter is 1, thus if one packet is queued, the | |
106 | * application will block until that packet is passed to the | |
107 | * driver. | |
108 | * | |
109 | * RECEIVE: | |
110 | * | |
111 | * Wanpipe device drivers call the socket bottom half | |
112 | * function, wanpipe_rcv() to queue the incoming packets | |
113 | * into an AF_WANPIPE socket queue. Based on wanpipe_rcv() | |
114 | * return code, the driver knows whether the packet was | |
115 | * successfully queued. If the socket queue is full, | |
116 | * protocol flow control is used by the driver, if any, | |
117 | * to slow down the traffic until the sock queue is free. | |
118 | * | |
119 | * Every time a packet arrives into a socket queue the | |
120 | * socket wakes up processes which are waiting to receive | |
121 | * data. | |
122 | * | |
123 | * If the socket queue is full, the driver sets a block | |
124 | * bit which signals the socket to kick the wanpipe driver | |
125 | * bottom half hander when the socket queue is partialy | |
126 | * empty. wanpipe_recvmsg() function performs this action. | |
127 | * | |
128 | * In case of x25api, packets will never be dropped, since | |
129 | * flow control is available. | |
130 | * | |
131 | * In case of streaming protocols like CHDLC, packets will | |
132 | * be dropped but the statistics will be generated. | |
133 | */ | |
134 | ||
135 | ||
136 | /* The code below is used to test memory leaks. It prints out | |
137 | * a message every time kmalloc and kfree system calls get executed. | |
138 | * If the calls match there is no leak :) | |
139 | */ | |
140 | ||
141 | /***********FOR DEBUGGING PURPOSES********************************************* | |
142 | #define KMEM_SAFETYZONE 8 | |
143 | ||
144 | static void * dbg_kmalloc(unsigned int size, int prio, int line) { | |
145 | void * v = kmalloc(size,prio); | |
146 | printk(KERN_INFO "line %d kmalloc(%d,%d) = %p\n",line,size,prio,v); | |
147 | return v; | |
148 | } | |
149 | static void dbg_kfree(void * v, int line) { | |
150 | printk(KERN_INFO "line %d kfree(%p)\n",line,v); | |
151 | kfree(v); | |
152 | } | |
153 | ||
154 | #define kmalloc(x,y) dbg_kmalloc(x,y,__LINE__) | |
155 | #define kfree(x) dbg_kfree(x,__LINE__) | |
156 | ******************************************************************************/ | |
157 | ||
158 | ||
159 | /* List of all wanpipe sockets. */ | |
160 | HLIST_HEAD(wanpipe_sklist); | |
161 | static DEFINE_RWLOCK(wanpipe_sklist_lock); | |
162 | ||
163 | atomic_t wanpipe_socks_nr; | |
164 | static unsigned long wanpipe_tx_critical; | |
165 | ||
166 | #if 0 | |
167 | /* Private wanpipe socket structures. */ | |
168 | struct wanpipe_opt | |
169 | { | |
170 | void *mbox; /* Mail box */ | |
171 | void *card; /* Card bouded to */ | |
172 | struct net_device *dev; /* Bounded device */ | |
173 | unsigned short lcn; /* Binded LCN */ | |
174 | unsigned char svc; /* 0=pvc, 1=svc */ | |
175 | unsigned char timer; /* flag for delayed transmit*/ | |
176 | struct timer_list tx_timer; | |
177 | unsigned poll_cnt; | |
178 | unsigned char force; /* Used to force sock release */ | |
179 | atomic_t packet_sent; | |
180 | }; | |
181 | #endif | |
182 | ||
183 | static int sk_count; | |
184 | extern struct proto_ops wanpipe_ops; | |
185 | static unsigned long find_free_critical; | |
186 | ||
187 | static void wanpipe_unlink_driver(struct sock *sk); | |
188 | static void wanpipe_link_driver(struct net_device *dev, struct sock *sk); | |
189 | static void wanpipe_wakeup_driver(struct sock *sk); | |
190 | static int execute_command(struct sock *, unsigned char, unsigned int); | |
191 | static int check_dev(struct net_device *dev, sdla_t *card); | |
192 | struct net_device *wanpipe_find_free_dev(sdla_t *card); | |
193 | static void wanpipe_unlink_card (struct sock *); | |
194 | static int wanpipe_link_card (struct sock *); | |
195 | static struct sock *wanpipe_make_new(struct sock *); | |
196 | static struct sock *wanpipe_alloc_socket(void); | |
197 | static inline int get_atomic_device(struct net_device *dev); | |
198 | static int wanpipe_exec_cmd(struct sock *, int, unsigned int); | |
199 | static int get_ioctl_cmd (struct sock *, void *); | |
200 | static int set_ioctl_cmd (struct sock *, void *); | |
201 | static void release_device(struct net_device *dev); | |
202 | static void wanpipe_kill_sock_timer (unsigned long data); | |
203 | static void wanpipe_kill_sock_irq (struct sock *); | |
204 | static void wanpipe_kill_sock_accept (struct sock *); | |
205 | static int wanpipe_do_bind(struct sock *sk, struct net_device *dev, | |
206 | int protocol); | |
207 | struct sock * get_newsk_from_skb (struct sk_buff *); | |
208 | static int wanpipe_debug (struct sock *, void *); | |
209 | static void wanpipe_delayed_transmit (unsigned long data); | |
210 | static void release_driver(struct sock *); | |
211 | static void start_cleanup_timer (struct sock *); | |
212 | static void check_write_queue(struct sock *); | |
213 | static int check_driver_busy (struct sock *); | |
214 | ||
215 | /*============================================================ | |
216 | * wanpipe_rcv | |
217 | * | |
218 | * Wanpipe socket bottom half handler. This function | |
219 | * is called by the WANPIPE device drivers to queue a | |
220 | * incoming packet into the socket receive queue. | |
221 | * Once the packet is queued, all processes waiting to | |
222 | * read are woken up. | |
223 | * | |
224 | * During socket bind, this function is bounded into | |
225 | * WANPIPE driver private. | |
226 | *===========================================================*/ | |
227 | ||
228 | static int wanpipe_rcv(struct sk_buff *skb, struct net_device *dev, | |
229 | struct sock *sk) | |
230 | { | |
231 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb; | |
232 | wanpipe_common_t *chan = dev->priv; | |
233 | /* | |
234 | * When we registered the protocol we saved the socket in the data | |
235 | * field for just this event. | |
236 | */ | |
237 | ||
238 | skb->dev = dev; | |
239 | ||
240 | sll->sll_family = AF_WANPIPE; | |
241 | sll->sll_hatype = dev->type; | |
242 | sll->sll_protocol = skb->protocol; | |
243 | sll->sll_pkttype = skb->pkt_type; | |
244 | sll->sll_ifindex = dev->ifindex; | |
245 | sll->sll_halen = 0; | |
246 | ||
247 | if (dev->hard_header_parse) | |
248 | sll->sll_halen = dev->hard_header_parse(skb, sll->sll_addr); | |
249 | ||
250 | /* | |
251 | * WAN_PACKET_DATA : Data which should be passed up the receive queue. | |
252 | * WAN_PACKET_ASYC : Asynchronous data like place call, which should | |
253 | * be passed up the listening sock. | |
254 | * WAN_PACKET_ERR : Asynchronous data like clear call or restart | |
255 | * which should go into an error queue. | |
256 | */ | |
257 | switch (skb->pkt_type){ | |
258 | ||
259 | case WAN_PACKET_DATA: | |
260 | if (sock_queue_rcv_skb(sk,skb)<0){ | |
261 | return -ENOMEM; | |
262 | } | |
263 | break; | |
264 | case WAN_PACKET_CMD: | |
265 | sk->sk_state = chan->state; | |
266 | /* Bug fix: update Mar6. | |
267 | * Do not set the sock lcn number here, since | |
268 | * cmd is not guaranteed to be executed on the | |
269 | * board, thus Lcn could be wrong */ | |
270 | sk->sk_data_ready(sk, skb->len); | |
271 | kfree_skb(skb); | |
272 | break; | |
273 | case WAN_PACKET_ERR: | |
274 | sk->sk_state = chan->state; | |
275 | if (sock_queue_err_skb(sk,skb)<0){ | |
276 | return -ENOMEM; | |
277 | } | |
278 | break; | |
279 | default: | |
280 | printk(KERN_INFO "wansock: BH Illegal Packet Type Dropping\n"); | |
281 | kfree_skb(skb); | |
282 | break; | |
283 | } | |
284 | ||
285 | //?????????????????????? | |
286 | // if (sk->sk_state == WANSOCK_DISCONNECTED){ | |
287 | // if (sk->sk_zapped) { | |
288 | // //printk(KERN_INFO "wansock: Disconnected, killing early\n"); | |
289 | // wanpipe_unlink_driver(sk); | |
290 | // sk->sk_bound_dev_if = 0; | |
291 | // } | |
292 | // } | |
293 | ||
294 | return 0; | |
295 | } | |
296 | ||
297 | /*============================================================ | |
298 | * wanpipe_listen_rcv | |
299 | * | |
300 | * Wanpipe LISTEN socket bottom half handler. This function | |
301 | * is called by the WANPIPE device drivers to queue an | |
302 | * incoming call into the socket listening queue. | |
303 | * Once the packet is queued, the waiting accept() process | |
304 | * is woken up. | |
305 | * | |
306 | * During socket bind, this function is bounded into | |
307 | * WANPIPE driver private. | |
308 | * | |
309 | * IMPORTANT NOTE: | |
310 | * The accept call() is waiting for an skb packet | |
311 | * which contains a pointer to a device structure. | |
312 | * | |
313 | * When we do a bind to a device structre, we | |
314 | * bind a newly created socket into "chan->sk". Thus, | |
315 | * when accept receives the skb packet, it will know | |
316 | * from which dev it came form, and in turn it will know | |
317 | * the address of the new sock. | |
318 | * | |
319 | * NOTE: This function gets called from driver ISR. | |
320 | *===========================================================*/ | |
321 | ||
322 | static int wanpipe_listen_rcv (struct sk_buff *skb, struct sock *sk) | |
323 | { | |
324 | wanpipe_opt *wp = wp_sk(sk), *newwp; | |
325 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)skb->cb; | |
326 | struct sock *newsk; | |
327 | struct net_device *dev; | |
328 | sdla_t *card; | |
329 | mbox_cmd_t *mbox_ptr; | |
330 | wanpipe_common_t *chan; | |
331 | ||
332 | /* Find a free device, if none found, all svc's are busy | |
333 | */ | |
334 | ||
335 | card = (sdla_t*)wp->card; | |
336 | if (!card){ | |
337 | printk(KERN_INFO "wansock: LISTEN ERROR, No Card\n"); | |
338 | return -ENODEV; | |
339 | } | |
340 | ||
341 | dev = wanpipe_find_free_dev(card); | |
342 | if (!dev){ | |
343 | printk(KERN_INFO "wansock: LISTEN ERROR, No Free Device\n"); | |
344 | return -ENODEV; | |
345 | } | |
346 | ||
347 | chan=dev->priv; | |
348 | chan->state = WANSOCK_CONNECTING; | |
349 | ||
350 | /* Allocate a new sock, which accept will bind | |
351 | * and pass up to the user | |
352 | */ | |
353 | if ((newsk = wanpipe_make_new(sk)) == NULL){ | |
354 | release_device(dev); | |
355 | return -ENOMEM; | |
356 | } | |
357 | ||
358 | ||
359 | /* Initialize the new sock structure | |
360 | */ | |
361 | newsk->sk_bound_dev_if = dev->ifindex; | |
362 | newwp = wp_sk(newsk); | |
363 | newwp->card = wp->card; | |
364 | ||
365 | /* Insert the sock into the main wanpipe | |
366 | * sock list. | |
367 | */ | |
368 | atomic_inc(&wanpipe_socks_nr); | |
369 | ||
370 | /* Allocate and fill in the new Mail Box. Then | |
371 | * bind the mail box to the sock. It will be | |
372 | * used by the ioctl call to read call information | |
373 | * and to execute commands. | |
374 | */ | |
375 | if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) { | |
376 | wanpipe_kill_sock_irq (newsk); | |
377 | release_device(dev); | |
378 | return -ENOMEM; | |
379 | } | |
380 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); | |
381 | memcpy(mbox_ptr,skb->data,skb->len); | |
382 | ||
383 | /* Register the lcn on which incoming call came | |
384 | * from. Thus, if we have to clear it, we know | |
385 | * which lcn to clear | |
386 | */ | |
387 | ||
388 | newwp->lcn = mbox_ptr->cmd.lcn; | |
389 | newwp->mbox = (void *)mbox_ptr; | |
390 | ||
391 | DBG_PRINTK(KERN_INFO "NEWSOCK : Device %s, bind to lcn %i\n", | |
392 | dev->name,mbox_ptr->cmd.lcn); | |
393 | ||
394 | chan->lcn = mbox_ptr->cmd.lcn; | |
395 | card->u.x.svc_to_dev_map[(chan->lcn%MAX_X25_LCN)] = dev; | |
396 | ||
397 | sock_reset_flag(newsk, SOCK_ZAPPED); | |
398 | newwp->num = htons(X25_PROT); | |
399 | ||
400 | if (wanpipe_do_bind(newsk, dev, newwp->num)) { | |
401 | wanpipe_kill_sock_irq (newsk); | |
402 | release_device(dev); | |
403 | return -EINVAL; | |
404 | } | |
405 | newsk->sk_state = WANSOCK_CONNECTING; | |
406 | ||
407 | ||
408 | /* Fill in the standard sock address info */ | |
409 | ||
410 | sll->sll_family = AF_WANPIPE; | |
411 | sll->sll_hatype = dev->type; | |
412 | sll->sll_protocol = skb->protocol; | |
413 | sll->sll_pkttype = skb->pkt_type; | |
414 | sll->sll_ifindex = dev->ifindex; | |
415 | sll->sll_halen = 0; | |
416 | ||
417 | skb->dev = dev; | |
418 | sk->sk_ack_backlog++; | |
419 | ||
420 | /* We must do this manually, since the sock_queue_rcv_skb() | |
421 | * function sets the skb->dev to NULL. However, we use | |
422 | * the dev field in the accept function.*/ | |
423 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
424 | (unsigned)sk->sk_rcvbuf) { | |
425 | ||
426 | wanpipe_unlink_driver(newsk); | |
427 | wanpipe_kill_sock_irq (newsk); | |
428 | --sk->sk_ack_backlog; | |
429 | return -ENOMEM; | |
430 | } | |
431 | ||
432 | skb_set_owner_r(skb, sk); | |
433 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
434 | sk->sk_data_ready(sk, skb->len); | |
435 | ||
436 | return 0; | |
437 | } | |
438 | ||
439 | ||
440 | ||
441 | /*============================================================ | |
442 | * wanpipe_make_new | |
443 | * | |
444 | * Create a new sock, and allocate a wanpipe private | |
445 | * structure to it. Also, copy the important data | |
446 | * from the original sock to the new sock. | |
447 | * | |
448 | * This function is used by wanpipe_listen_rcv() listen | |
449 | * bottom half handler. A copy of the listening sock | |
450 | * is created using this function. | |
451 | * | |
452 | *===========================================================*/ | |
453 | ||
454 | static struct sock *wanpipe_make_new(struct sock *osk) | |
455 | { | |
456 | struct sock *sk; | |
457 | ||
458 | if (osk->sk_type != SOCK_RAW) | |
459 | return NULL; | |
460 | ||
461 | if ((sk = wanpipe_alloc_socket()) == NULL) | |
462 | return NULL; | |
463 | ||
464 | sk->sk_type = osk->sk_type; | |
465 | sk->sk_socket = osk->sk_socket; | |
466 | sk->sk_priority = osk->sk_priority; | |
467 | sk->sk_protocol = osk->sk_protocol; | |
468 | wp_sk(sk)->num = wp_sk(osk)->num; | |
469 | sk->sk_rcvbuf = osk->sk_rcvbuf; | |
470 | sk->sk_sndbuf = osk->sk_sndbuf; | |
471 | sk->sk_state = WANSOCK_CONNECTING; | |
472 | sk->sk_sleep = osk->sk_sleep; | |
473 | ||
474 | if (sock_flag(osk, SOCK_DBG)) | |
475 | sock_set_flag(sk, SOCK_DBG); | |
476 | ||
477 | return sk; | |
478 | } | |
479 | ||
480 | /* | |
481 | * FIXME: wanpipe_opt has to include a sock in its definition and stop using | |
482 | * sk_protinfo, but this code is not even compilable now, so lets leave it for | |
483 | * later. | |
484 | */ | |
485 | static struct proto wanpipe_proto = { | |
486 | .name = "WANPIPE", | |
487 | .owner = THIS_MODULE, | |
488 | .obj_size = sizeof(struct sock), | |
489 | }; | |
490 | ||
491 | /*============================================================ | |
492 | * wanpipe_make_new | |
493 | * | |
494 | * Allocate memory for the a new sock, and sock | |
495 | * private data. | |
496 | * | |
497 | * Increment the module use count. | |
498 | * | |
499 | * This function is used by wanpipe_create() and | |
500 | * wanpipe_make_new() functions. | |
501 | * | |
502 | *===========================================================*/ | |
503 | ||
504 | static struct sock *wanpipe_alloc_socket(void) | |
505 | { | |
506 | struct sock *sk; | |
507 | struct wanpipe_opt *wan_opt; | |
508 | ||
509 | if ((sk = sk_alloc(PF_WANPIPE, GFP_ATOMIC, &wanpipe_proto, 1)) == NULL) | |
510 | return NULL; | |
511 | ||
512 | if ((wan_opt = kmalloc(sizeof(struct wanpipe_opt), GFP_ATOMIC)) == NULL) { | |
513 | sk_free(sk); | |
514 | return NULL; | |
515 | } | |
516 | memset(wan_opt, 0x00, sizeof(struct wanpipe_opt)); | |
517 | ||
518 | wp_sk(sk) = wan_opt; | |
519 | ||
520 | /* Use timer to send data to the driver. This will act | |
521 | * as a BH handler for sendmsg functions */ | |
522 | init_timer(&wan_opt->tx_timer); | |
523 | wan_opt->tx_timer.data = (unsigned long)sk; | |
524 | wan_opt->tx_timer.function = wanpipe_delayed_transmit; | |
525 | ||
526 | sock_init_data(NULL, sk); | |
527 | return sk; | |
528 | } | |
529 | ||
530 | ||
531 | /*============================================================ | |
532 | * wanpipe_sendmsg | |
533 | * | |
534 | * This function implements a sendto() system call, | |
535 | * for AF_WANPIPE socket family. | |
536 | * During socket bind() sk->sk_bound_dev_if is initialized | |
537 | * to a correct network device. This number is used | |
538 | * to find a network device to which the packet should | |
539 | * be passed to. | |
540 | * | |
541 | * Each packet is queued into sk->sk_write_queue and | |
542 | * delayed transmit bottom half handler is marked for | |
543 | * execution. | |
544 | * | |
545 | * A socket must be in WANSOCK_CONNECTED state before | |
546 | * a packet is queued into sk->sk_write_queue. | |
547 | *===========================================================*/ | |
548 | ||
549 | static int wanpipe_sendmsg(struct kiocb *iocb, struct socket *sock, | |
550 | struct msghdr *msg, int len) | |
551 | { | |
552 | wanpipe_opt *wp; | |
553 | struct sock *sk = sock->sk; | |
554 | struct wan_sockaddr_ll *saddr=(struct wan_sockaddr_ll *)msg->msg_name; | |
555 | struct sk_buff *skb; | |
556 | struct net_device *dev; | |
557 | unsigned short proto; | |
558 | unsigned char *addr; | |
559 | int ifindex, err, reserve = 0; | |
560 | ||
561 | ||
562 | if (!sock_flag(sk, SOCK_ZAPPED)) | |
563 | return -ENETDOWN; | |
564 | ||
565 | if (sk->sk_state != WANSOCK_CONNECTED) | |
566 | return -ENOTCONN; | |
567 | ||
568 | if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT)) | |
569 | return(-EINVAL); | |
570 | ||
571 | /* it was <=, now one can send | |
572 | * zero length packets */ | |
573 | if (len < sizeof(x25api_hdr_t)) | |
574 | return -EINVAL; | |
575 | ||
576 | wp = wp_sk(sk); | |
577 | ||
578 | if (saddr == NULL) { | |
579 | ifindex = sk->sk_bound_dev_if; | |
580 | proto = wp->num; | |
581 | addr = NULL; | |
582 | ||
583 | }else{ | |
584 | if (msg->msg_namelen < sizeof(struct wan_sockaddr_ll)){ | |
585 | return -EINVAL; | |
586 | } | |
587 | ||
588 | ifindex = sk->sk_bound_dev_if; | |
589 | proto = saddr->sll_protocol; | |
590 | addr = saddr->sll_addr; | |
591 | } | |
592 | ||
593 | dev = dev_get_by_index(ifindex); | |
594 | if (dev == NULL){ | |
595 | printk(KERN_INFO "wansock: Send failed, dev index: %i\n",ifindex); | |
596 | return -ENXIO; | |
597 | } | |
598 | dev_put(dev); | |
599 | ||
600 | if (sock->type == SOCK_RAW) | |
601 | reserve = dev->hard_header_len; | |
602 | ||
603 | if (len > dev->mtu+reserve){ | |
604 | return -EMSGSIZE; | |
605 | } | |
606 | ||
607 | skb = sock_alloc_send_skb(sk, len + LL_RESERVED_SPACE(dev), | |
608 | msg->msg_flags & MSG_DONTWAIT, &err); | |
609 | ||
610 | if (skb==NULL){ | |
611 | goto out_unlock; | |
612 | } | |
613 | ||
614 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
615 | skb->nh.raw = skb->data; | |
616 | ||
617 | /* Returns -EFAULT on error */ | |
618 | err = memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len); | |
619 | if (err){ | |
620 | goto out_free; | |
621 | } | |
622 | ||
623 | if (dev->hard_header) { | |
624 | int res; | |
625 | err = -EINVAL; | |
626 | res = dev->hard_header(skb, dev, ntohs(proto), addr, NULL, len); | |
627 | if (res<0){ | |
628 | goto out_free; | |
629 | } | |
630 | } | |
631 | ||
632 | skb->protocol = proto; | |
633 | skb->dev = dev; | |
634 | skb->priority = sk->sk_priority; | |
635 | skb->pkt_type = WAN_PACKET_DATA; | |
636 | ||
637 | err = -ENETDOWN; | |
638 | if (!(dev->flags & IFF_UP)) | |
639 | goto out_free; | |
640 | ||
641 | if (atomic_read(&sk->sk_wmem_alloc) + skb->truesize > | |
642 | (unsigned int)sk->sk_sndbuf){ | |
643 | kfree_skb(skb); | |
644 | return -ENOBUFS; | |
645 | } | |
646 | ||
647 | skb_queue_tail(&sk->sk_write_queue,skb); | |
648 | atomic_inc(&wp->packet_sent); | |
649 | ||
650 | if (!(test_and_set_bit(0, &wp->timer))) | |
651 | mod_timer(&wp->tx_timer, jiffies + 1); | |
652 | ||
653 | return(len); | |
654 | ||
655 | out_free: | |
656 | kfree_skb(skb); | |
657 | out_unlock: | |
658 | return err; | |
659 | } | |
660 | ||
661 | /*============================================================ | |
662 | * wanpipe_delayed_tarnsmit | |
663 | * | |
664 | * Transmit bottom half handler. It dequeues packets | |
665 | * from sk->sk_write_queue and passes them to the | |
666 | * driver. If the driver is busy, the packet is | |
667 | * re-enqueued. | |
668 | * | |
669 | * Packet Sent counter is decremented on successful | |
670 | * transmission. | |
671 | *===========================================================*/ | |
672 | ||
673 | ||
674 | static void wanpipe_delayed_transmit (unsigned long data) | |
675 | { | |
676 | struct sock *sk=(struct sock *)data; | |
677 | struct sk_buff *skb; | |
678 | wanpipe_opt *wp = wp_sk(sk); | |
679 | struct net_device *dev = wp->dev; | |
680 | sdla_t *card = (sdla_t*)wp->card; | |
681 | ||
682 | if (!card || !dev){ | |
683 | clear_bit(0, &wp->timer); | |
684 | DBG_PRINTK(KERN_INFO "wansock: Transmit delay, no dev or card\n"); | |
685 | return; | |
686 | } | |
687 | ||
688 | if (sk->sk_state != WANSOCK_CONNECTED || !sock_flag(sk, SOCK_ZAPPED)) { | |
689 | clear_bit(0, &wp->timer); | |
690 | DBG_PRINTK(KERN_INFO "wansock: Tx Timer, State not CONNECTED\n"); | |
691 | return; | |
692 | } | |
693 | ||
694 | /* If driver is executing command, we must offload | |
695 | * the board by not sending data. Otherwise a | |
696 | * pending command will never get a free buffer | |
697 | * to execute */ | |
698 | if (atomic_read(&card->u.x.command_busy)){ | |
699 | wp->tx_timer.expires = jiffies + SLOW_BACKOFF; | |
700 | add_timer(&wp->tx_timer); | |
701 | DBG_PRINTK(KERN_INFO "wansock: Tx Timer, command bys BACKOFF\n"); | |
702 | return; | |
703 | } | |
704 | ||
705 | ||
706 | if (test_and_set_bit(0,&wanpipe_tx_critical)){ | |
707 | printk(KERN_INFO "WanSock: Tx timer critical %s\n",dev->name); | |
708 | wp->tx_timer.expires = jiffies + SLOW_BACKOFF; | |
709 | add_timer(&wp->tx_timer); | |
710 | return; | |
711 | } | |
712 | ||
713 | /* Check for a packet in the fifo and send */ | |
714 | if ((skb = skb_dequeue(&sk->sk_write_queue)) != NULL){ | |
715 | ||
716 | if (dev->hard_start_xmit(skb, dev) != 0){ | |
717 | ||
718 | /* Driver failed to transmit, re-enqueue | |
719 | * the packet and retry again later */ | |
720 | skb_queue_head(&sk->sk_write_queue,skb); | |
721 | clear_bit(0,&wanpipe_tx_critical); | |
722 | return; | |
723 | }else{ | |
724 | ||
725 | /* Packet Sent successful. Check for more packets | |
726 | * if more packets, re-trigger the transmit routine | |
727 | * other wise exit | |
728 | */ | |
729 | atomic_dec(&wp->packet_sent); | |
730 | ||
731 | if (skb_peek(&sk->sk_write_queue) == NULL) { | |
732 | /* If there is nothing to send, kick | |
733 | * the poll routine, which will trigger | |
734 | * the application to send more data */ | |
735 | sk->sk_data_ready(sk, 0); | |
736 | clear_bit(0, &wp->timer); | |
737 | }else{ | |
738 | /* Reschedule as fast as possible */ | |
739 | wp->tx_timer.expires = jiffies + 1; | |
740 | add_timer(&wp->tx_timer); | |
741 | } | |
742 | } | |
743 | } | |
744 | clear_bit(0,&wanpipe_tx_critical); | |
745 | } | |
746 | ||
747 | /*============================================================ | |
748 | * execute_command | |
749 | * | |
750 | * Execute x25api commands. The atomic variable | |
751 | * chan->command is used to indicate to the driver that | |
752 | * command is pending for execution. The acutal command | |
753 | * structure is placed into a sock mbox structure | |
754 | * (wp_sk(sk)->mbox). | |
755 | * | |
756 | * The sock private structure, mbox is | |
757 | * used as shared memory between sock and the driver. | |
758 | * Driver uses the sock mbox to execute the command | |
759 | * and return the result. | |
760 | * | |
761 | * For all command except PLACE CALL, the function | |
762 | * waits for the result. PLACE CALL can be ether | |
763 | * blocking or nonblocking. The user sets this option | |
764 | * via ioctl call. | |
765 | *===========================================================*/ | |
766 | ||
767 | ||
768 | static int execute_command(struct sock *sk, unsigned char cmd, unsigned int flags) | |
769 | { | |
770 | wanpipe_opt *wp = wp_sk(sk); | |
771 | struct net_device *dev; | |
772 | wanpipe_common_t *chan=NULL; | |
773 | int err=0; | |
774 | DECLARE_WAITQUEUE(wait, current); | |
775 | ||
776 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
777 | if (dev == NULL){ | |
778 | printk(KERN_INFO "wansock: Exec failed no dev %i\n", | |
779 | sk->sk_bound_dev_if); | |
780 | return -ENODEV; | |
781 | } | |
782 | dev_put(dev); | |
783 | ||
784 | if ((chan=dev->priv) == NULL){ | |
785 | printk(KERN_INFO "wansock: Exec cmd failed no priv area\n"); | |
786 | return -ENODEV; | |
787 | } | |
788 | ||
789 | if (atomic_read(&chan->command)){ | |
790 | printk(KERN_INFO "wansock: ERROR: Command already running %x, %s\n", | |
791 | atomic_read(&chan->command),dev->name); | |
792 | return -EINVAL; | |
793 | } | |
794 | ||
795 | if (!wp->mbox) { | |
796 | printk(KERN_INFO "wansock: In execute without MBOX\n"); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | ((mbox_cmd_t*)wp->mbox)->cmd.command = cmd; | |
801 | ((mbox_cmd_t*)wp->mbox)->cmd.lcn = wp->lcn; | |
802 | ((mbox_cmd_t*)wp->mbox)->cmd.result = 0x7F; | |
803 | ||
804 | ||
805 | if (flags & O_NONBLOCK){ | |
806 | cmd |= 0x80; | |
807 | atomic_set(&chan->command, cmd); | |
808 | }else{ | |
809 | atomic_set(&chan->command, cmd); | |
810 | } | |
811 | ||
812 | add_wait_queue(sk->sk_sleep,&wait); | |
813 | current->state = TASK_INTERRUPTIBLE; | |
814 | for (;;){ | |
815 | if (((mbox_cmd_t*)wp->mbox)->cmd.result != 0x7F) { | |
816 | err = 0; | |
817 | break; | |
818 | } | |
819 | if (signal_pending(current)) { | |
820 | err = -ERESTARTSYS; | |
821 | break; | |
822 | } | |
823 | schedule(); | |
824 | } | |
825 | current->state = TASK_RUNNING; | |
826 | remove_wait_queue(sk->sk_sleep,&wait); | |
827 | ||
828 | return err; | |
829 | } | |
830 | ||
831 | /*============================================================ | |
832 | * wanpipe_destroy_timer | |
833 | * | |
834 | * Used by wanpipe_release, to delay release of | |
835 | * the socket. | |
836 | *===========================================================*/ | |
837 | ||
838 | static void wanpipe_destroy_timer(unsigned long data) | |
839 | { | |
840 | struct sock *sk=(struct sock *)data; | |
841 | wanpipe_opt *wp = wp_sk(sk); | |
842 | ||
843 | if ((!atomic_read(&sk->sk_wmem_alloc) && | |
844 | !atomic_read(&sk->sk_rmem_alloc)) || | |
845 | (++wp->force == 5)) { | |
846 | ||
847 | if (atomic_read(&sk->sk_wmem_alloc) || | |
848 | atomic_read(&sk->sk_rmem_alloc)) | |
849 | printk(KERN_INFO "wansock: Warning, Packet Discarded due to sock shutdown!\n"); | |
850 | ||
851 | kfree(wp); | |
852 | wp_sk(sk) = NULL; | |
853 | ||
854 | if (atomic_read(&sk->sk_refcnt) != 1) { | |
855 | atomic_set(&sk->sk_refcnt, 1); | |
856 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :delay.\n", | |
857 | atomic_read(&sk->sk_refcnt)); | |
858 | } | |
859 | sock_put(sk); | |
860 | atomic_dec(&wanpipe_socks_nr); | |
861 | return; | |
862 | } | |
863 | ||
864 | sk->sk_timer.expires = jiffies + 5 * HZ; | |
865 | add_timer(&sk->sk_timer); | |
866 | printk(KERN_INFO "wansock: packet sk destroy delayed\n"); | |
867 | } | |
868 | ||
869 | /*============================================================ | |
870 | * wanpipe_unlink_driver | |
871 | * | |
872 | * When the socket is released, this function is | |
873 | * used to remove links that bind the sock and the | |
874 | * driver together. | |
875 | *===========================================================*/ | |
876 | static void wanpipe_unlink_driver (struct sock *sk) | |
877 | { | |
878 | struct net_device *dev; | |
879 | wanpipe_common_t *chan=NULL; | |
880 | ||
881 | sock_reset_flag(sk, SOCK_ZAPPED); | |
882 | sk->sk_state = WANSOCK_DISCONNECTED; | |
883 | wp_sk(sk)->dev = NULL; | |
884 | ||
885 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
886 | if (!dev){ | |
887 | printk(KERN_INFO "wansock: No dev on release\n"); | |
888 | return; | |
889 | } | |
890 | dev_put(dev); | |
891 | ||
892 | if ((chan = dev->priv) == NULL){ | |
893 | printk(KERN_INFO "wansock: No Priv Area on release\n"); | |
894 | return; | |
895 | } | |
896 | ||
897 | set_bit(0,&chan->common_critical); | |
898 | chan->sk=NULL; | |
899 | chan->func=NULL; | |
900 | chan->mbox=NULL; | |
901 | chan->tx_timer=NULL; | |
902 | clear_bit(0,&chan->common_critical); | |
903 | release_device(dev); | |
904 | ||
905 | return; | |
906 | } | |
907 | ||
908 | /*============================================================ | |
909 | * wanpipe_link_driver | |
910 | * | |
911 | * Upon successful bind(), sock is linked to a driver | |
912 | * by binding in the wanpipe_rcv() bottom half handler | |
913 | * to the driver function pointer, as well as sock and | |
914 | * sock mailbox addresses. This way driver can pass | |
915 | * data up the socket. | |
916 | *===========================================================*/ | |
917 | ||
918 | static void wanpipe_link_driver(struct net_device *dev, struct sock *sk) | |
919 | { | |
920 | wanpipe_opt *wp = wp_sk(sk); | |
921 | wanpipe_common_t *chan = dev->priv; | |
922 | if (!chan) | |
923 | return; | |
924 | set_bit(0,&chan->common_critical); | |
925 | chan->sk=sk; | |
926 | chan->func=wanpipe_rcv; | |
927 | chan->mbox = wp->mbox; | |
928 | chan->tx_timer = &wp->tx_timer; | |
929 | wp->dev = dev; | |
930 | sock_set_flag(sk, SOCK_ZAPPED); | |
931 | clear_bit(0,&chan->common_critical); | |
932 | } | |
933 | ||
934 | ||
935 | /*============================================================ | |
936 | * release_device | |
937 | * | |
938 | * During sock release, clear a critical bit, which | |
939 | * marks the device a being taken. | |
940 | *===========================================================*/ | |
941 | ||
942 | ||
943 | static void release_device(struct net_device *dev) | |
944 | { | |
945 | wanpipe_common_t *chan=dev->priv; | |
946 | clear_bit(0,(void*)&chan->rw_bind); | |
947 | } | |
948 | ||
949 | /*============================================================ | |
950 | * wanpipe_release | |
951 | * | |
952 | * Close a PACKET socket. This is fairly simple. We | |
953 | * immediately go to 'closed' state and remove our | |
954 | * protocol entry in the device list. | |
955 | *===========================================================*/ | |
956 | ||
957 | static int wanpipe_release(struct socket *sock) | |
958 | { | |
959 | wanpipe_opt *wp; | |
960 | struct sock *sk = sock->sk; | |
961 | ||
962 | if (!sk) | |
963 | return 0; | |
964 | ||
965 | wp = wp_sk(sk); | |
966 | check_write_queue(sk); | |
967 | ||
968 | /* Kill the tx timer, if we don't kill it now, the timer | |
969 | * will run after we kill the sock. Timer code will | |
970 | * try to access the sock which has been killed and cause | |
971 | * kernel panic */ | |
972 | ||
973 | del_timer(&wp->tx_timer); | |
974 | ||
975 | /* | |
976 | * Unhook packet receive handler. | |
977 | */ | |
978 | ||
979 | if (wp->num == htons(X25_PROT) && | |
980 | sk->sk_state != WANSOCK_DISCONNECTED && sock_flag(sk, SOCK_ZAPPED)) { | |
981 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); | |
982 | wanpipe_common_t *chan; | |
983 | if (dev){ | |
984 | chan=dev->priv; | |
985 | atomic_set(&chan->disconnect,1); | |
986 | DBG_PRINTK(KERN_INFO "wansock: Sending Clear Indication %i\n", | |
987 | sk->sk_state); | |
988 | dev_put(dev); | |
989 | } | |
990 | } | |
991 | ||
992 | set_bit(1,&wanpipe_tx_critical); | |
993 | write_lock(&wanpipe_sklist_lock); | |
994 | sk_del_node_init(sk); | |
995 | write_unlock(&wanpipe_sklist_lock); | |
996 | clear_bit(1,&wanpipe_tx_critical); | |
997 | ||
998 | ||
999 | ||
1000 | release_driver(sk); | |
1001 | ||
1002 | ||
1003 | /* | |
1004 | * Now the socket is dead. No more input will appear. | |
1005 | */ | |
1006 | ||
1007 | sk->sk_state_change(sk); /* It is useless. Just for sanity. */ | |
1008 | ||
1009 | sock->sk = NULL; | |
1010 | sk->sk_socket = NULL; | |
1011 | sock_set_flag(sk, SOCK_DEAD); | |
1012 | ||
1013 | /* Purge queues */ | |
1014 | skb_queue_purge(&sk->sk_receive_queue); | |
1015 | skb_queue_purge(&sk->sk_write_queue); | |
1016 | skb_queue_purge(&sk->sk_error_queue); | |
1017 | ||
1018 | if (atomic_read(&sk->sk_rmem_alloc) || | |
1019 | atomic_read(&sk->sk_wmem_alloc)) { | |
1020 | del_timer(&sk->sk_timer); | |
1021 | printk(KERN_INFO "wansock: Killing in Timer R %i , W %i\n", | |
1022 | atomic_read(&sk->sk_rmem_alloc), | |
1023 | atomic_read(&sk->sk_wmem_alloc)); | |
1024 | sk->sk_timer.data = (unsigned long)sk; | |
1025 | sk->sk_timer.expires = jiffies + HZ; | |
1026 | sk->sk_timer.function = wanpipe_destroy_timer; | |
1027 | add_timer(&sk->sk_timer); | |
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | kfree(wp); | |
1032 | wp_sk(sk) = NULL; | |
1033 | ||
1034 | if (atomic_read(&sk->sk_refcnt) != 1) { | |
1035 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:release.\n", | |
1036 | atomic_read(&sk->sk_refcnt)); | |
1037 | atomic_set(&sk->sk_refcnt, 1); | |
1038 | } | |
1039 | sock_put(sk); | |
1040 | atomic_dec(&wanpipe_socks_nr); | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | /*============================================================ | |
1045 | * check_write_queue | |
1046 | * | |
1047 | * During sock shutdown, if the sock state is | |
1048 | * WANSOCK_CONNECTED and there is transmit data | |
1049 | * pending. Wait until data is released | |
1050 | * before proceeding. | |
1051 | *===========================================================*/ | |
1052 | ||
1053 | static void check_write_queue(struct sock *sk) | |
1054 | { | |
1055 | ||
1056 | if (sk->sk_state != WANSOCK_CONNECTED) | |
1057 | return; | |
1058 | ||
1059 | if (!atomic_read(&sk->sk_wmem_alloc)) | |
1060 | return; | |
1061 | ||
1062 | printk(KERN_INFO "wansock: MAJOR ERROR, Data lost on sock release !!!\n"); | |
1063 | ||
1064 | } | |
1065 | ||
1066 | /*============================================================ | |
1067 | * release_driver | |
1068 | * | |
1069 | * This function is called during sock shutdown, to | |
1070 | * release any resources and links that bind the sock | |
1071 | * to the driver. It also changes the state of the | |
1072 | * sock to WANSOCK_DISCONNECTED | |
1073 | *===========================================================*/ | |
1074 | ||
1075 | static void release_driver(struct sock *sk) | |
1076 | { | |
1077 | wanpipe_opt *wp; | |
1078 | struct sk_buff *skb=NULL; | |
1079 | struct sock *deadsk=NULL; | |
1080 | ||
1081 | if (sk->sk_state == WANSOCK_LISTEN || | |
1082 | sk->sk_state == WANSOCK_BIND_LISTEN) { | |
1083 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { | |
1084 | if ((deadsk = get_newsk_from_skb(skb))){ | |
1085 | DBG_PRINTK (KERN_INFO "wansock: RELEASE: FOUND DEAD SOCK\n"); | |
1086 | sock_set_flag(deadsk, SOCK_DEAD); | |
1087 | start_cleanup_timer(deadsk); | |
1088 | } | |
1089 | kfree_skb(skb); | |
1090 | } | |
1091 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1092 | wanpipe_unlink_card(sk); | |
1093 | }else{ | |
1094 | if (sock_flag(sk, SOCK_ZAPPED)) | |
1095 | wanpipe_unlink_driver(sk); | |
1096 | } | |
1097 | sk->sk_state = WANSOCK_DISCONNECTED; | |
1098 | sk->sk_bound_dev_if = 0; | |
1099 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1100 | wp = wp_sk(sk); | |
1101 | ||
1102 | if (wp && wp->mbox) { | |
1103 | kfree(wp->mbox); | |
1104 | wp->mbox = NULL; | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | /*============================================================ | |
1109 | * start_cleanup_timer | |
1110 | * | |
1111 | * If new incoming call's are pending but the socket | |
1112 | * is being released, start the timer which will | |
1113 | * envoke the kill routines for pending socks. | |
1114 | *===========================================================*/ | |
1115 | ||
1116 | ||
1117 | static void start_cleanup_timer (struct sock *sk) | |
1118 | { | |
1119 | del_timer(&sk->sk_timer); | |
1120 | sk->sk_timer.data = (unsigned long)sk; | |
1121 | sk->sk_timer.expires = jiffies + HZ; | |
1122 | sk->sk_timer.function = wanpipe_kill_sock_timer; | |
1123 | add_timer(&sk->sk_timer); | |
1124 | } | |
1125 | ||
1126 | ||
1127 | /*============================================================ | |
1128 | * wanpipe_kill_sock | |
1129 | * | |
1130 | * This is a function which performs actual killing | |
1131 | * of the sock. It releases socket resources, | |
1132 | * and unlinks the sock from the driver. | |
1133 | *===========================================================*/ | |
1134 | ||
1135 | static void wanpipe_kill_sock_timer (unsigned long data) | |
1136 | { | |
1137 | ||
1138 | struct sock *sk = (struct sock *)data; | |
1139 | struct sock **skp; | |
1140 | ||
1141 | if (!sk) | |
1142 | return; | |
1143 | ||
1144 | /* This function can be called from interrupt. We must use | |
1145 | * appropriate locks */ | |
1146 | ||
1147 | if (test_bit(1,&wanpipe_tx_critical)){ | |
1148 | sk->sk_timer.expires = jiffies + 10; | |
1149 | add_timer(&sk->sk_timer); | |
1150 | return; | |
1151 | } | |
1152 | ||
1153 | write_lock(&wanpipe_sklist_lock); | |
1154 | sk_del_node_init(sk); | |
1155 | write_unlock(&wanpipe_sklist_lock); | |
1156 | ||
1157 | ||
1158 | if (wp_sk(sk)->num == htons(X25_PROT) && | |
1159 | sk->sk_state != WANSOCK_DISCONNECTED) { | |
1160 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); | |
1161 | wanpipe_common_t *chan; | |
1162 | if (dev){ | |
1163 | chan=dev->priv; | |
1164 | atomic_set(&chan->disconnect,1); | |
1165 | dev_put(dev); | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | release_driver(sk); | |
1170 | ||
1171 | sk->sk_socket = NULL; | |
1172 | ||
1173 | /* Purge queues */ | |
1174 | skb_queue_purge(&sk->sk_receive_queue); | |
1175 | skb_queue_purge(&sk->sk_write_queue); | |
1176 | skb_queue_purge(&sk->sk_error_queue); | |
1177 | ||
1178 | if (atomic_read(&sk->sk_rmem_alloc) || | |
1179 | atomic_read(&sk->sk_wmem_alloc)) { | |
1180 | del_timer(&sk->sk_timer); | |
1181 | printk(KERN_INFO "wansock: Killing SOCK in Timer\n"); | |
1182 | sk->sk_timer.data = (unsigned long)sk; | |
1183 | sk->sk_timer.expires = jiffies + HZ; | |
1184 | sk->sk_timer.function = wanpipe_destroy_timer; | |
1185 | add_timer(&sk->sk_timer); | |
1186 | return; | |
1187 | } | |
1188 | ||
1189 | if (wp_sk(sk)) { | |
1190 | kfree(wp_sk(sk)); | |
1191 | wp_sk(sk) = NULL; | |
1192 | } | |
1193 | ||
1194 | if (atomic_read(&sk->sk_refcnt) != 1) { | |
1195 | atomic_set(&sk->sk_refcnt, 1); | |
1196 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n", | |
1197 | atomic_read(&sk->sk_refcnt)); | |
1198 | } | |
1199 | sock_put(sk); | |
1200 | atomic_dec(&wanpipe_socks_nr); | |
1201 | return; | |
1202 | } | |
1203 | ||
1204 | static void wanpipe_kill_sock_accept (struct sock *sk) | |
1205 | { | |
1206 | ||
1207 | struct sock **skp; | |
1208 | ||
1209 | if (!sk) | |
1210 | return; | |
1211 | ||
1212 | /* This function can be called from interrupt. We must use | |
1213 | * appropriate locks */ | |
1214 | ||
1215 | write_lock(&wanpipe_sklist_lock); | |
1216 | sk_del_node_init(sk); | |
1217 | write_unlock(&wanpipe_sklist_lock); | |
1218 | ||
1219 | sk->sk_socket = NULL; | |
1220 | ||
1221 | ||
1222 | if (wp_sk(sk)) { | |
1223 | kfree(wp_sk(sk)); | |
1224 | wp_sk(sk) = NULL; | |
1225 | } | |
1226 | ||
1227 | if (atomic_read(&sk->sk_refcnt) != 1) { | |
1228 | atomic_set(&sk->sk_refcnt, 1); | |
1229 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i ! :timer.\n", | |
1230 | atomic_read(&sk->sk_refcnt)); | |
1231 | } | |
1232 | sock_put(sk); | |
1233 | atomic_dec(&wanpipe_socks_nr); | |
1234 | return; | |
1235 | } | |
1236 | ||
1237 | ||
1238 | static void wanpipe_kill_sock_irq (struct sock *sk) | |
1239 | { | |
1240 | ||
1241 | if (!sk) | |
1242 | return; | |
1243 | ||
1244 | sk->sk_socket = NULL; | |
1245 | ||
1246 | if (wp_sk(sk)) { | |
1247 | kfree(wp_sk(sk)); | |
1248 | wp_sk(sk) = NULL; | |
1249 | } | |
1250 | ||
1251 | if (atomic_read(&sk->sk_refcnt) != 1) { | |
1252 | atomic_set(&sk->sk_refcnt, 1); | |
1253 | DBG_PRINTK(KERN_INFO "wansock: Error, wrong reference count: %i !:listen.\n", | |
1254 | atomic_read(&sk->sk_refcnt)); | |
1255 | } | |
1256 | sock_put(sk); | |
1257 | atomic_dec(&wanpipe_socks_nr); | |
1258 | } | |
1259 | ||
1260 | ||
1261 | /*============================================================ | |
1262 | * wanpipe_do_bind | |
1263 | * | |
1264 | * Bottom half of the binding system call. | |
1265 | * Once the wanpipe_bind() function checks the | |
1266 | * legality of the call, this function binds the | |
1267 | * sock to the driver. | |
1268 | *===========================================================*/ | |
1269 | ||
1270 | static int wanpipe_do_bind(struct sock *sk, struct net_device *dev, | |
1271 | int protocol) | |
1272 | { | |
1273 | wanpipe_opt *wp = wp_sk(sk); | |
1274 | wanpipe_common_t *chan=NULL; | |
1275 | int err=0; | |
1276 | ||
1277 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1278 | err = -EALREADY; | |
1279 | goto bind_unlock_exit; | |
1280 | } | |
1281 | ||
1282 | wp->num = protocol; | |
1283 | ||
1284 | if (protocol == 0){ | |
1285 | release_device(dev); | |
1286 | err = -EINVAL; | |
1287 | goto bind_unlock_exit; | |
1288 | } | |
1289 | ||
1290 | if (dev) { | |
1291 | if (dev->flags&IFF_UP) { | |
1292 | chan=dev->priv; | |
1293 | sk->sk_state = chan->state; | |
1294 | ||
1295 | if (wp->num == htons(X25_PROT) && | |
1296 | sk->sk_state != WANSOCK_DISCONNECTED && | |
1297 | sk->sk_state != WANSOCK_CONNECTING) { | |
1298 | DBG_PRINTK(KERN_INFO | |
1299 | "wansock: Binding to Device not DISCONNECTED %i\n", | |
1300 | sk->sk_state); | |
1301 | release_device(dev); | |
1302 | err = -EAGAIN; | |
1303 | goto bind_unlock_exit; | |
1304 | } | |
1305 | ||
1306 | wanpipe_link_driver(dev,sk); | |
1307 | sk->sk_bound_dev_if = dev->ifindex; | |
1308 | ||
1309 | /* X25 Specific option */ | |
1310 | if (wp->num == htons(X25_PROT)) | |
1311 | wp_sk(sk)->svc = chan->svc; | |
1312 | ||
1313 | } else { | |
1314 | sk->sk_err = ENETDOWN; | |
1315 | sk->sk_error_report(sk); | |
1316 | release_device(dev); | |
1317 | err = -EINVAL; | |
1318 | } | |
1319 | } else { | |
1320 | err = -ENODEV; | |
1321 | } | |
1322 | bind_unlock_exit: | |
1323 | /* FIXME where is this lock */ | |
1324 | ||
1325 | return err; | |
1326 | } | |
1327 | ||
1328 | /*============================================================ | |
1329 | * wanpipe_bind | |
1330 | * | |
1331 | * BIND() System call, which is bound to the AF_WANPIPE | |
1332 | * operations structure. It checks for correct wanpipe | |
1333 | * card name, and cross references interface names with | |
1334 | * the card names. Thus, interface name must belong to | |
1335 | * the actual card. | |
1336 | *===========================================================*/ | |
1337 | ||
1338 | ||
1339 | static int wanpipe_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) | |
1340 | { | |
1341 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr; | |
1342 | struct sock *sk=sock->sk; | |
1343 | wanpipe_opt *wp = wp_sk(sk); | |
1344 | struct net_device *dev = NULL; | |
1345 | sdla_t *card=NULL; | |
1346 | char name[15]; | |
1347 | ||
1348 | /* | |
1349 | * Check legality | |
1350 | */ | |
1351 | ||
1352 | if (addr_len < sizeof(struct wan_sockaddr_ll)){ | |
1353 | printk(KERN_INFO "wansock: Address length error\n"); | |
1354 | return -EINVAL; | |
1355 | } | |
1356 | if (sll->sll_family != AF_WANPIPE){ | |
1357 | printk(KERN_INFO "wansock: Illegal family name specified.\n"); | |
1358 | return -EINVAL; | |
1359 | } | |
1360 | ||
1361 | card = wanpipe_find_card (sll->sll_card); | |
1362 | if (!card){ | |
1363 | printk(KERN_INFO "wansock: Wanpipe card not found: %s\n",sll->sll_card); | |
1364 | return -ENODEV; | |
1365 | }else{ | |
1366 | wp_sk(sk)->card = (void *)card; | |
1367 | } | |
1368 | ||
1369 | if (!strcmp(sll->sll_device,"svc_listen")){ | |
1370 | ||
1371 | /* Bind a sock to a card structure for listening | |
1372 | */ | |
1373 | int err=0; | |
1374 | ||
1375 | /* This is x25 specific area if protocol doesn't | |
1376 | * match, return error */ | |
1377 | if (sll->sll_protocol != htons(X25_PROT)) | |
1378 | return -EINVAL; | |
1379 | ||
1380 | err= wanpipe_link_card (sk); | |
1381 | if (err < 0) | |
1382 | return err; | |
1383 | ||
1384 | if (sll->sll_protocol) | |
1385 | wp->num = sll->sll_protocol; | |
1386 | sk->sk_state = WANSOCK_BIND_LISTEN; | |
1387 | return 0; | |
1388 | ||
1389 | }else if (!strcmp(sll->sll_device,"svc_connect")){ | |
1390 | ||
1391 | /* This is x25 specific area if protocol doesn't | |
1392 | * match, return error */ | |
1393 | if (sll->sll_protocol != htons(X25_PROT)) | |
1394 | return -EINVAL; | |
1395 | ||
1396 | /* Find a free device | |
1397 | */ | |
1398 | dev = wanpipe_find_free_dev(card); | |
1399 | if (dev == NULL){ | |
1400 | DBG_PRINTK(KERN_INFO "wansock: No free network devices for card %s\n", | |
1401 | card->devname); | |
1402 | return -EINVAL; | |
1403 | } | |
1404 | }else{ | |
1405 | /* Bind a socket to a interface name | |
1406 | * This is used by PVC mostly | |
1407 | */ | |
1408 | strlcpy(name,sll->sll_device,sizeof(name)); | |
1409 | dev = dev_get_by_name(name); | |
1410 | if (dev == NULL){ | |
1411 | printk(KERN_INFO "wansock: Failed to get Dev from name: %s,\n", | |
1412 | name); | |
1413 | return -ENODEV; | |
1414 | } | |
1415 | ||
1416 | dev_put(dev); | |
1417 | ||
1418 | if (check_dev(dev, card)){ | |
1419 | printk(KERN_INFO "wansock: Device %s, doesn't belong to card %s\n", | |
1420 | dev->name, card->devname); | |
1421 | return -EINVAL; | |
1422 | } | |
1423 | if (get_atomic_device (dev)) | |
1424 | return -EINVAL; | |
1425 | } | |
1426 | ||
1427 | return wanpipe_do_bind(sk, dev, sll->sll_protocol ? : wp->num); | |
1428 | } | |
1429 | ||
1430 | /*============================================================ | |
1431 | * get_atomic_device | |
1432 | * | |
1433 | * Sets a bit atomically which indicates that | |
1434 | * the interface is taken. This avoids race conditions. | |
1435 | *===========================================================*/ | |
1436 | ||
1437 | ||
1438 | static inline int get_atomic_device(struct net_device *dev) | |
1439 | { | |
1440 | wanpipe_common_t *chan = dev->priv; | |
1441 | if (!test_and_set_bit(0,(void *)&chan->rw_bind)){ | |
1442 | return 0; | |
1443 | } | |
1444 | return 1; | |
1445 | } | |
1446 | ||
1447 | /*============================================================ | |
1448 | * check_dev | |
1449 | * | |
1450 | * Check that device name belongs to a particular card. | |
1451 | *===========================================================*/ | |
1452 | ||
1453 | static int check_dev(struct net_device *dev, sdla_t *card) | |
1454 | { | |
1455 | struct net_device* tmp_dev; | |
1456 | ||
1457 | for (tmp_dev = card->wandev.dev; tmp_dev; | |
1458 | tmp_dev = *((struct net_device **)tmp_dev->priv)) { | |
1459 | if (tmp_dev->ifindex == dev->ifindex){ | |
1460 | return 0; | |
1461 | } | |
1462 | } | |
1463 | return 1; | |
1464 | } | |
1465 | ||
1466 | /*============================================================ | |
1467 | * wanpipe_find_free_dev | |
1468 | * | |
1469 | * Find a free network interface. If found set atomic | |
1470 | * bit indicating that the interface is taken. | |
1471 | * X25API Specific. | |
1472 | *===========================================================*/ | |
1473 | ||
1474 | struct net_device *wanpipe_find_free_dev(sdla_t *card) | |
1475 | { | |
1476 | struct net_device* dev; | |
1477 | volatile wanpipe_common_t *chan; | |
1478 | ||
1479 | if (test_and_set_bit(0,&find_free_critical)){ | |
1480 | printk(KERN_INFO "CRITICAL in Find Free\n"); | |
1481 | } | |
1482 | ||
1483 | for (dev = card->wandev.dev; dev; | |
1484 | dev = *((struct net_device **)dev->priv)) { | |
1485 | chan = dev->priv; | |
1486 | if (!chan) | |
1487 | continue; | |
1488 | if (chan->usedby == API && chan->svc){ | |
1489 | if (!get_atomic_device (dev)){ | |
1490 | if (chan->state != WANSOCK_DISCONNECTED){ | |
1491 | release_device(dev); | |
1492 | }else{ | |
1493 | clear_bit(0,&find_free_critical); | |
1494 | return dev; | |
1495 | } | |
1496 | } | |
1497 | } | |
1498 | } | |
1499 | clear_bit(0,&find_free_critical); | |
1500 | return NULL; | |
1501 | } | |
1502 | ||
1503 | /*============================================================ | |
1504 | * wanpipe_create | |
1505 | * | |
1506 | * SOCKET() System call. It allocates a sock structure | |
1507 | * and adds the socket to the wanpipe_sk_list. | |
1508 | * Crates AF_WANPIPE socket. | |
1509 | *===========================================================*/ | |
1510 | ||
1511 | static int wanpipe_create(struct socket *sock, int protocol) | |
1512 | { | |
1513 | struct sock *sk; | |
1514 | ||
1515 | //FIXME: This checks for root user, SECURITY ? | |
1516 | //if (!capable(CAP_NET_RAW)) | |
1517 | // return -EPERM; | |
1518 | ||
1519 | if (sock->type != SOCK_DGRAM && sock->type != SOCK_RAW) | |
1520 | return -ESOCKTNOSUPPORT; | |
1521 | ||
1522 | sock->state = SS_UNCONNECTED; | |
1523 | ||
1524 | if ((sk = wanpipe_alloc_socket()) == NULL) | |
1525 | return -ENOBUFS; | |
1526 | ||
1527 | sk->sk_reuse = 1; | |
1528 | sock->ops = &wanpipe_ops; | |
1529 | sock_init_data(sock,sk); | |
1530 | ||
1531 | sock_reset_flag(sk, SOCK_ZAPPED); | |
1532 | sk->sk_family = PF_WANPIPE; | |
1533 | wp_sk(sk)->num = protocol; | |
1534 | sk->sk_state = WANSOCK_DISCONNECTED; | |
1535 | sk->sk_ack_backlog = 0; | |
1536 | sk->sk_bound_dev_if = 0; | |
1537 | ||
1538 | atomic_inc(&wanpipe_socks_nr); | |
1539 | ||
1540 | /* We must disable interrupts because the ISR | |
1541 | * can also change the list */ | |
1542 | set_bit(1,&wanpipe_tx_critical); | |
1543 | write_lock(&wanpipe_sklist_lock); | |
1544 | sk_add_node(sk, &wanpipe_sklist); | |
1545 | write_unlock(&wanpipe_sklist_lock); | |
1546 | clear_bit(1,&wanpipe_tx_critical); | |
1547 | ||
1548 | return(0); | |
1549 | } | |
1550 | ||
1551 | ||
1552 | /*============================================================ | |
1553 | * wanpipe_recvmsg | |
1554 | * | |
1555 | * Pull a packet from our receive queue and hand it | |
1556 | * to the user. If necessary we block. | |
1557 | *===========================================================*/ | |
1558 | ||
1559 | static int wanpipe_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1560 | struct msghdr *msg, int len, int flags) | |
1561 | { | |
1562 | struct sock *sk = sock->sk; | |
1563 | struct sk_buff *skb; | |
1564 | int copied, err=-ENOBUFS; | |
1565 | ||
1566 | ||
1567 | /* | |
1568 | * If the address length field is there to be filled in, we fill | |
1569 | * it in now. | |
1570 | */ | |
1571 | ||
1572 | msg->msg_namelen = sizeof(struct wan_sockaddr_ll); | |
1573 | ||
1574 | /* | |
1575 | * Call the generic datagram receiver. This handles all sorts | |
1576 | * of horrible races and re-entrancy so we can forget about it | |
1577 | * in the protocol layers. | |
1578 | * | |
1579 | * Now it will return ENETDOWN, if device have just gone down, | |
1580 | * but then it will block. | |
1581 | */ | |
1582 | ||
1583 | if (flags & MSG_OOB){ | |
1584 | skb = skb_dequeue(&sk->sk_error_queue); | |
1585 | }else{ | |
1586 | skb=skb_recv_datagram(sk,flags,1,&err); | |
1587 | } | |
1588 | /* | |
1589 | * An error occurred so return it. Because skb_recv_datagram() | |
1590 | * handles the blocking we don't see and worry about blocking | |
1591 | * retries. | |
1592 | */ | |
1593 | ||
1594 | if(skb==NULL) | |
1595 | goto out; | |
1596 | ||
1597 | /* | |
1598 | * You lose any data beyond the buffer you gave. If it worries a | |
1599 | * user program they can ask the device for its MTU anyway. | |
1600 | */ | |
1601 | ||
1602 | copied = skb->len; | |
1603 | if (copied > len) | |
1604 | { | |
1605 | copied=len; | |
1606 | msg->msg_flags|=MSG_TRUNC; | |
1607 | } | |
1608 | ||
1609 | wanpipe_wakeup_driver(sk); | |
1610 | ||
1611 | /* We can't use skb_copy_datagram here */ | |
1612 | err = memcpy_toiovec(msg->msg_iov, skb->data, copied); | |
1613 | if (err) | |
1614 | goto out_free; | |
1615 | ||
1616 | sock_recv_timestamp(msg, sk, skb); | |
1617 | ||
1618 | if (msg->msg_name) | |
1619 | memcpy(msg->msg_name, skb->cb, msg->msg_namelen); | |
1620 | ||
1621 | /* | |
1622 | * Free or return the buffer as appropriate. Again this | |
1623 | * hides all the races and re-entrancy issues from us. | |
1624 | */ | |
1625 | err = (flags&MSG_TRUNC) ? skb->len : copied; | |
1626 | ||
1627 | out_free: | |
1628 | skb_free_datagram(sk, skb); | |
1629 | out: | |
1630 | return err; | |
1631 | } | |
1632 | ||
1633 | ||
1634 | /*============================================================ | |
1635 | * wanpipe_wakeup_driver | |
1636 | * | |
1637 | * If socket receive buffer is full and driver cannot | |
1638 | * pass data up the sock, it sets a packet_block flag. | |
1639 | * This function check that flag and if sock receive | |
1640 | * queue has room it kicks the driver BH handler. | |
1641 | * | |
1642 | * This way, driver doesn't have to poll the sock | |
1643 | * receive queue. | |
1644 | *===========================================================*/ | |
1645 | ||
1646 | static void wanpipe_wakeup_driver(struct sock *sk) | |
1647 | { | |
1648 | struct net_device *dev = NULL; | |
1649 | wanpipe_common_t *chan=NULL; | |
1650 | ||
1651 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
1652 | if (!dev) | |
1653 | return; | |
1654 | ||
1655 | dev_put(dev); | |
1656 | ||
1657 | if ((chan = dev->priv) == NULL) | |
1658 | return; | |
1659 | ||
1660 | if (atomic_read(&chan->receive_block)){ | |
1661 | if (atomic_read(&sk->sk_rmem_alloc) < | |
1662 | ((unsigned)sk->sk_rcvbuf * 0.9)) { | |
1663 | printk(KERN_INFO "wansock: Queuing task for wanpipe\n"); | |
1664 | atomic_set(&chan->receive_block,0); | |
1665 | wanpipe_queue_tq(&chan->wanpipe_task); | |
1666 | wanpipe_mark_bh(); | |
1667 | } | |
1668 | } | |
1669 | } | |
1670 | ||
1671 | /*============================================================ | |
1672 | * wanpipe_getname | |
1673 | * | |
1674 | * I don't know what to do with this yet. | |
1675 | * User can use this function to get sock address | |
1676 | * information. Not very useful for Sangoma's purposes. | |
1677 | *===========================================================*/ | |
1678 | ||
1679 | ||
1680 | static int wanpipe_getname(struct socket *sock, struct sockaddr *uaddr, | |
1681 | int *uaddr_len, int peer) | |
1682 | { | |
1683 | struct net_device *dev; | |
1684 | struct sock *sk = sock->sk; | |
1685 | struct wan_sockaddr_ll *sll = (struct wan_sockaddr_ll*)uaddr; | |
1686 | ||
1687 | sll->sll_family = AF_WANPIPE; | |
1688 | sll->sll_ifindex = sk->sk_bound_dev_if; | |
1689 | sll->sll_protocol = wp_sk(sk)->num; | |
1690 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
1691 | if (dev) { | |
1692 | sll->sll_hatype = dev->type; | |
1693 | sll->sll_halen = dev->addr_len; | |
1694 | memcpy(sll->sll_addr, dev->dev_addr, dev->addr_len); | |
1695 | } else { | |
1696 | sll->sll_hatype = 0; /* Bad: we have no ARPHRD_UNSPEC */ | |
1697 | sll->sll_halen = 0; | |
1698 | } | |
1699 | *uaddr_len = sizeof(*sll); | |
1700 | ||
1701 | dev_put(dev); | |
1702 | ||
1703 | return 0; | |
1704 | } | |
1705 | ||
1706 | /*============================================================ | |
1707 | * wanpipe_notifier | |
1708 | * | |
1709 | * If driver turns off network interface, this function | |
1710 | * will be envoked. Currently I treate it as a | |
1711 | * call disconnect. More thought should go into this | |
1712 | * function. | |
1713 | * | |
1714 | * FIXME: More thought should go into this function. | |
1715 | * | |
1716 | *===========================================================*/ | |
1717 | ||
1718 | static int wanpipe_notifier(struct notifier_block *this, unsigned long msg, void *data) | |
1719 | { | |
1720 | struct sock *sk; | |
1721 | hlist_node *node; | |
1722 | struct net_device *dev = (struct net_device *)data; | |
1723 | ||
1724 | sk_for_each(sk, node, &wanpipe_sklist) { | |
1725 | struct wanpipe_opt *po = wp_sk(sk); | |
1726 | ||
1727 | if (!po) | |
1728 | continue; | |
1729 | if (dev == NULL) | |
1730 | continue; | |
1731 | ||
1732 | switch (msg) { | |
1733 | case NETDEV_DOWN: | |
1734 | case NETDEV_UNREGISTER: | |
1735 | if (dev->ifindex == sk->sk_bound_dev_if) { | |
1736 | printk(KERN_INFO "wansock: Device down %s\n",dev->name); | |
1737 | if (sock_flag(sk, SOCK_ZAPPED)) { | |
1738 | wanpipe_unlink_driver(sk); | |
1739 | sk->sk_err = ENETDOWN; | |
1740 | sk->sk_error_report(sk); | |
1741 | } | |
1742 | ||
1743 | if (msg == NETDEV_UNREGISTER) { | |
1744 | printk(KERN_INFO "wansock: Unregistering Device: %s\n", | |
1745 | dev->name); | |
1746 | wanpipe_unlink_driver(sk); | |
1747 | sk->sk_bound_dev_if = 0; | |
1748 | } | |
1749 | } | |
1750 | break; | |
1751 | case NETDEV_UP: | |
1752 | if (dev->ifindex == sk->sk_bound_dev_if && | |
1753 | po->num && !sock_flag(sk, SOCK_ZAPPED)) { | |
1754 | printk(KERN_INFO "wansock: Registering Device: %s\n", | |
1755 | dev->name); | |
1756 | wanpipe_link_driver(dev,sk); | |
1757 | } | |
1758 | break; | |
1759 | } | |
1760 | } | |
1761 | return NOTIFY_DONE; | |
1762 | } | |
1763 | ||
1764 | /*============================================================ | |
1765 | * wanpipe_ioctl | |
1766 | * | |
1767 | * Execute a user commands, and set socket options. | |
1768 | * | |
1769 | * FIXME: More thought should go into this function. | |
1770 | * | |
1771 | *===========================================================*/ | |
1772 | ||
1773 | static int wanpipe_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1774 | { | |
1775 | struct sock *sk = sock->sk; | |
1776 | int err; | |
1777 | ||
1778 | switch(cmd) | |
1779 | { | |
1780 | case SIOCGSTAMP: | |
1781 | return sock_get_timestamp(sk, (struct timeval __user *)arg); | |
1782 | ||
1783 | case SIOC_WANPIPE_CHECK_TX: | |
1784 | ||
1785 | return atomic_read(&sk->sk_wmem_alloc); | |
1786 | ||
1787 | case SIOC_WANPIPE_SOCK_STATE: | |
1788 | ||
1789 | if (sk->sk_state == WANSOCK_CONNECTED) | |
1790 | return 0; | |
1791 | ||
1792 | return 1; | |
1793 | ||
1794 | ||
1795 | case SIOC_WANPIPE_GET_CALL_DATA: | |
1796 | ||
1797 | return get_ioctl_cmd (sk,(void*)arg); | |
1798 | ||
1799 | case SIOC_WANPIPE_SET_CALL_DATA: | |
1800 | ||
1801 | return set_ioctl_cmd (sk,(void*)arg); | |
1802 | ||
1803 | case SIOC_WANPIPE_ACCEPT_CALL: | |
1804 | case SIOC_WANPIPE_CLEAR_CALL: | |
1805 | case SIOC_WANPIPE_RESET_CALL: | |
1806 | ||
1807 | if ((err=set_ioctl_cmd(sk,(void*)arg)) < 0) | |
1808 | return err; | |
1809 | ||
1810 | err=wanpipe_exec_cmd(sk,cmd,0); | |
1811 | get_ioctl_cmd(sk,(void*)arg); | |
1812 | return err; | |
1813 | ||
1814 | case SIOC_WANPIPE_DEBUG: | |
1815 | ||
1816 | return wanpipe_debug(sk,(void*)arg); | |
1817 | ||
1818 | case SIOC_WANPIPE_SET_NONBLOCK: | |
1819 | ||
1820 | if (sk->sk_state != WANSOCK_DISCONNECTED) | |
1821 | return -EINVAL; | |
1822 | ||
1823 | sock->file->f_flags |= O_NONBLOCK; | |
1824 | return 0; | |
1825 | ||
1826 | #ifdef CONFIG_INET | |
1827 | case SIOCADDRT: | |
1828 | case SIOCDELRT: | |
1829 | case SIOCDARP: | |
1830 | case SIOCGARP: | |
1831 | case SIOCSARP: | |
1832 | case SIOCDRARP: | |
1833 | case SIOCGRARP: | |
1834 | case SIOCSRARP: | |
1835 | case SIOCGIFADDR: | |
1836 | case SIOCSIFADDR: | |
1837 | case SIOCGIFBRDADDR: | |
1838 | case SIOCSIFBRDADDR: | |
1839 | case SIOCGIFNETMASK: | |
1840 | case SIOCSIFNETMASK: | |
1841 | case SIOCGIFDSTADDR: | |
1842 | case SIOCSIFDSTADDR: | |
1843 | case SIOCSIFFLAGS: | |
1844 | return inet_dgram_ops.ioctl(sock, cmd, arg); | |
1845 | #endif | |
1846 | ||
1847 | default: | |
1848 | return dev_ioctl(cmd,(void __user *) arg); | |
1849 | } | |
1850 | /*NOTREACHED*/ | |
1851 | } | |
1852 | ||
1853 | /*============================================================ | |
1854 | * wanpipe_debug | |
1855 | * | |
1856 | * This function will pass up information about all | |
1857 | * active sockets. | |
1858 | * | |
1859 | * FIXME: More thought should go into this function. | |
1860 | * | |
1861 | *===========================================================*/ | |
1862 | ||
1863 | static int wanpipe_debug (struct sock *origsk, void *arg) | |
1864 | { | |
1865 | struct sock *sk; | |
1866 | struct hlist_node *node; | |
1867 | struct net_device *dev = NULL; | |
1868 | wanpipe_common_t *chan=NULL; | |
1869 | int cnt=0, err=0; | |
1870 | wan_debug_t *dbg_data = (wan_debug_t *)arg; | |
1871 | ||
1872 | sk_for_each(sk, node, &wanpipe_sklist) { | |
1873 | wanpipe_opt *wp = wp_sk(sk); | |
1874 | ||
1875 | if (sk == origsk){ | |
1876 | continue; | |
1877 | } | |
1878 | ||
1879 | if ((err=put_user(1, &dbg_data->debug[cnt].free))) | |
1880 | return err; | |
1881 | if ((err = put_user(sk->sk_state, | |
1882 | &dbg_data->debug[cnt].state_sk))) | |
1883 | return err; | |
1884 | if ((err = put_user(sk->sk_rcvbuf, | |
1885 | &dbg_data->debug[cnt].rcvbuf))) | |
1886 | return err; | |
1887 | if ((err = put_user(atomic_read(&sk->sk_rmem_alloc), | |
1888 | &dbg_data->debug[cnt].rmem))) | |
1889 | return err; | |
1890 | if ((err = put_user(atomic_read(&sk->sk_wmem_alloc), | |
1891 | &dbg_data->debug[cnt].wmem))) | |
1892 | return err; | |
1893 | if ((err = put_user(sk->sk_sndbuf, | |
1894 | &dbg_data->debug[cnt].sndbuf))) | |
1895 | return err; | |
1896 | if ((err=put_user(sk_count, &dbg_data->debug[cnt].sk_count))) | |
1897 | return err; | |
1898 | if ((err=put_user(wp->poll_cnt, &dbg_data->debug[cnt].poll_cnt))) | |
1899 | return err; | |
1900 | if ((err = put_user(sk->sk_bound_dev_if, | |
1901 | &dbg_data->debug[cnt].bound))) | |
1902 | return err; | |
1903 | ||
1904 | if (sk->sk_bound_dev_if) { | |
1905 | dev = dev_get_by_index(sk->sk_bound_dev_if); | |
1906 | if (!dev) | |
1907 | continue; | |
1908 | ||
1909 | chan=dev->priv; | |
1910 | dev_put(dev); | |
1911 | ||
1912 | if ((err=put_user(chan->state, &dbg_data->debug[cnt].d_state))) | |
1913 | return err; | |
1914 | if ((err=put_user(chan->svc, &dbg_data->debug[cnt].svc))) | |
1915 | return err; | |
1916 | ||
1917 | if ((err=put_user(atomic_read(&chan->command), | |
1918 | &dbg_data->debug[cnt].command))) | |
1919 | return err; | |
1920 | ||
1921 | ||
1922 | if (wp){ | |
1923 | sdla_t *card = (sdla_t*)wp->card; | |
1924 | ||
1925 | if (card){ | |
1926 | if ((err=put_user(atomic_read(&card->u.x.command_busy), | |
1927 | &dbg_data->debug[cnt].cmd_busy))) | |
1928 | return err; | |
1929 | } | |
1930 | ||
1931 | if ((err=put_user(wp->lcn, | |
1932 | &dbg_data->debug[cnt].lcn))) | |
1933 | return err; | |
1934 | ||
1935 | if (wp->mbox) { | |
1936 | if ((err=put_user(1, &dbg_data->debug[cnt].mbox))) | |
1937 | return err; | |
1938 | } | |
1939 | } | |
1940 | ||
1941 | if ((err=put_user(atomic_read(&chan->receive_block), | |
1942 | &dbg_data->debug[cnt].rblock))) | |
1943 | return err; | |
1944 | ||
1945 | if (copy_to_user(dbg_data->debug[cnt].name, dev->name, strlen(dev->name))) | |
1946 | return -EFAULT; | |
1947 | } | |
1948 | ||
1949 | if (++cnt == MAX_NUM_DEBUG) | |
1950 | break; | |
1951 | } | |
1952 | return 0; | |
1953 | } | |
1954 | ||
1955 | /*============================================================ | |
1956 | * get_ioctl_cmd | |
1957 | * | |
1958 | * Pass up the contents of socket MBOX to the user. | |
1959 | *===========================================================*/ | |
1960 | ||
1961 | static int get_ioctl_cmd (struct sock *sk, void *arg) | |
1962 | { | |
1963 | x25api_t *usr_data = (x25api_t *)arg; | |
1964 | mbox_cmd_t *mbox_ptr; | |
1965 | int err; | |
1966 | ||
1967 | if (usr_data == NULL) | |
1968 | return -EINVAL; | |
1969 | ||
1970 | if (!wp_sk(sk)->mbox) { | |
1971 | return -EINVAL; | |
1972 | } | |
1973 | ||
1974 | mbox_ptr = (mbox_cmd_t *)wp_sk(sk)->mbox; | |
1975 | ||
1976 | if ((err=put_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm))) | |
1977 | return err; | |
1978 | if ((err=put_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause))) | |
1979 | return err; | |
1980 | if ((err=put_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn))) | |
1981 | return err; | |
1982 | if ((err=put_user(mbox_ptr->cmd.length, &usr_data->hdr.length))) | |
1983 | return err; | |
1984 | if ((err=put_user(mbox_ptr->cmd.result, &usr_data->hdr.result))) | |
1985 | return err; | |
1986 | if ((err=put_user(mbox_ptr->cmd.lcn, &usr_data->hdr.lcn))) | |
1987 | return err; | |
1988 | ||
1989 | if (mbox_ptr->cmd.length > 0){ | |
1990 | if (mbox_ptr->cmd.length > X25_MAX_DATA) | |
1991 | return -EINVAL; | |
1992 | ||
1993 | if (copy_to_user(usr_data->data, mbox_ptr->data, mbox_ptr->cmd.length)){ | |
1994 | printk(KERN_INFO "wansock: Copy failed !!!\n"); | |
1995 | return -EFAULT; | |
1996 | } | |
1997 | } | |
1998 | return 0; | |
1999 | } | |
2000 | ||
2001 | /*============================================================ | |
2002 | * set_ioctl_cmd | |
2003 | * | |
2004 | * Before command can be execute, socket MBOX must | |
2005 | * be created, and initialized with user data. | |
2006 | *===========================================================*/ | |
2007 | ||
2008 | static int set_ioctl_cmd (struct sock *sk, void *arg) | |
2009 | { | |
2010 | x25api_t *usr_data = (x25api_t *)arg; | |
2011 | mbox_cmd_t *mbox_ptr; | |
2012 | int err; | |
2013 | ||
2014 | if (!wp_sk(sk)->mbox) { | |
2015 | void *mbox_ptr; | |
2016 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); | |
2017 | if (!dev) | |
2018 | return -ENODEV; | |
2019 | ||
2020 | dev_put(dev); | |
2021 | ||
2022 | if ((mbox_ptr = kmalloc(sizeof(mbox_cmd_t), GFP_ATOMIC)) == NULL) | |
2023 | return -ENOMEM; | |
2024 | ||
2025 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); | |
2026 | wp_sk(sk)->mbox = mbox_ptr; | |
2027 | ||
2028 | wanpipe_link_driver(dev,sk); | |
2029 | } | |
2030 | ||
2031 | mbox_ptr = (mbox_cmd_t*)wp_sk(sk)->mbox; | |
2032 | memset(mbox_ptr, 0, sizeof(mbox_cmd_t)); | |
2033 | ||
2034 | if (usr_data == NULL){ | |
2035 | return 0; | |
2036 | } | |
2037 | if ((err=get_user(mbox_ptr->cmd.qdm, &usr_data->hdr.qdm))) | |
2038 | return err; | |
2039 | if ((err=get_user(mbox_ptr->cmd.cause, &usr_data->hdr.cause))) | |
2040 | return err; | |
2041 | if ((err=get_user(mbox_ptr->cmd.diagn, &usr_data->hdr.diagn))) | |
2042 | return err; | |
2043 | if ((err=get_user(mbox_ptr->cmd.length, &usr_data->hdr.length))) | |
2044 | return err; | |
2045 | if ((err=get_user(mbox_ptr->cmd.result, &usr_data->hdr.result))) | |
2046 | return err; | |
2047 | ||
2048 | if (mbox_ptr->cmd.length > 0){ | |
2049 | if (mbox_ptr->cmd.length > X25_MAX_DATA) | |
2050 | return -EINVAL; | |
2051 | ||
2052 | if (copy_from_user(mbox_ptr->data, usr_data->data, mbox_ptr->cmd.length)){ | |
2053 | printk(KERN_INFO "Copy failed\n"); | |
2054 | return -EFAULT; | |
2055 | } | |
2056 | } | |
2057 | return 0; | |
2058 | } | |
2059 | ||
2060 | ||
2061 | /*====================================================================== | |
2062 | * wanpipe_poll | |
2063 | * | |
2064 | * Datagram poll: Again totally generic. This also handles | |
2065 | * sequenced packet sockets providing the socket receive queue | |
2066 | * is only ever holding data ready to receive. | |
2067 | * | |
2068 | * Note: when you _don't_ use this routine for this protocol, | |
2069 | * and you use a different write policy from sock_writeable() | |
2070 | * then please supply your own write_space callback. | |
2071 | *=====================================================================*/ | |
2072 | ||
2073 | unsigned int wanpipe_poll(struct file * file, struct socket *sock, poll_table *wait) | |
2074 | { | |
2075 | struct sock *sk = sock->sk; | |
2076 | unsigned int mask; | |
2077 | ||
2078 | ++wp_sk(sk)->poll_cnt; | |
2079 | ||
2080 | poll_wait(file, sk->sk_sleep, wait); | |
2081 | mask = 0; | |
2082 | ||
2083 | /* exceptional events? */ | |
2084 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) { | |
2085 | mask |= POLLPRI; | |
2086 | return mask; | |
2087 | } | |
2088 | if (sk->sk_shutdown & RCV_SHUTDOWN) | |
2089 | mask |= POLLHUP; | |
2090 | ||
2091 | /* readable? */ | |
2092 | if (!skb_queue_empty(&sk->sk_receive_queue)) { | |
2093 | mask |= POLLIN | POLLRDNORM; | |
2094 | } | |
2095 | ||
2096 | /* connection hasn't started yet */ | |
2097 | if (sk->sk_state == WANSOCK_CONNECTING) { | |
2098 | return mask; | |
2099 | } | |
2100 | ||
2101 | if (sk->sk_state == WANSOCK_DISCONNECTED) { | |
2102 | mask = POLLPRI; | |
2103 | return mask; | |
2104 | } | |
2105 | ||
2106 | /* This check blocks the user process if there is | |
2107 | * a packet already queued in the socket write queue. | |
2108 | * This option is only for X25API protocol, for other | |
2109 | * protocol like chdlc enable streaming mode, | |
2110 | * where multiple packets can be pending in the socket | |
2111 | * transmit queue */ | |
2112 | ||
2113 | if (wp_sk(sk)->num == htons(X25_PROT)) { | |
2114 | if (atomic_read(&wp_sk(sk)->packet_sent)) | |
2115 | return mask; | |
2116 | } | |
2117 | ||
2118 | /* writable? */ | |
2119 | if (sock_writeable(sk)){ | |
2120 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; | |
2121 | }else{ | |
2122 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
2123 | } | |
2124 | ||
2125 | return mask; | |
2126 | } | |
2127 | ||
2128 | /*====================================================================== | |
2129 | * wanpipe_listen | |
2130 | * | |
2131 | * X25API Specific function. Set a socket into LISTENING MODE. | |
2132 | *=====================================================================*/ | |
2133 | ||
2134 | ||
2135 | static int wanpipe_listen(struct socket *sock, int backlog) | |
2136 | { | |
2137 | struct sock *sk = sock->sk; | |
2138 | ||
2139 | /* This is x25 specific area if protocol doesn't | |
2140 | * match, return error */ | |
2141 | if (wp_sk(sk)->num != htons(X25_PROT)) | |
2142 | return -EINVAL; | |
2143 | ||
2144 | if (sk->sk_state == WANSOCK_BIND_LISTEN) { | |
2145 | ||
2146 | sk->sk_max_ack_backlog = backlog; | |
2147 | sk->sk_state = WANSOCK_LISTEN; | |
2148 | return 0; | |
2149 | }else{ | |
2150 | printk(KERN_INFO "wansock: Listening sock was not binded\n"); | |
2151 | } | |
2152 | ||
2153 | return -EINVAL; | |
2154 | } | |
2155 | ||
2156 | /*====================================================================== | |
2157 | * wanpipe_link_card | |
2158 | * | |
2159 | * Connects the listening socket to the driver | |
2160 | *=====================================================================*/ | |
2161 | ||
2162 | static int wanpipe_link_card (struct sock *sk) | |
2163 | { | |
2164 | sdla_t *card = (sdla_t*)wp_sk(sk)->card; | |
2165 | ||
2166 | if (!card) | |
2167 | return -ENOMEM; | |
2168 | ||
2169 | if ((card->sk != NULL) || (card->func != NULL)){ | |
2170 | printk(KERN_INFO "wansock: Listening queue is already established\n"); | |
2171 | return -EINVAL; | |
2172 | } | |
2173 | ||
2174 | card->sk=sk; | |
2175 | card->func=wanpipe_listen_rcv; | |
2176 | sock_set_flag(sk, SOCK_ZAPPED); | |
2177 | ||
2178 | return 0; | |
2179 | } | |
2180 | ||
2181 | /*====================================================================== | |
2182 | * wanpipe_listen | |
2183 | * | |
2184 | * X25API Specific function. Disconnect listening socket from | |
2185 | * the driver. | |
2186 | *=====================================================================*/ | |
2187 | ||
2188 | static void wanpipe_unlink_card (struct sock *sk) | |
2189 | { | |
2190 | sdla_t *card = (sdla_t*)wp_sk(sk)->card; | |
2191 | ||
2192 | if (card){ | |
2193 | card->sk=NULL; | |
2194 | card->func=NULL; | |
2195 | } | |
2196 | } | |
2197 | ||
2198 | /*====================================================================== | |
2199 | * wanpipe_exec_cmd | |
2200 | * | |
2201 | * Ioctl function calls this function to execute user command. | |
2202 | * Connect() sytem call also calls this function to execute | |
2203 | * place call. This function blocks until command is executed. | |
2204 | *=====================================================================*/ | |
2205 | ||
2206 | static int wanpipe_exec_cmd(struct sock *sk, int cmd, unsigned int flags) | |
2207 | { | |
2208 | int err = -EINVAL; | |
2209 | wanpipe_opt *wp = wp_sk(sk); | |
2210 | mbox_cmd_t *mbox_ptr = (mbox_cmd_t*)wp->mbox; | |
2211 | ||
2212 | if (!mbox_ptr){ | |
2213 | printk(KERN_INFO "NO MBOX PTR !!!!!\n"); | |
2214 | return -EINVAL; | |
2215 | } | |
2216 | ||
2217 | /* This is x25 specific area if protocol doesn't | |
2218 | * match, return error */ | |
2219 | if (wp->num != htons(X25_PROT)) | |
2220 | return -EINVAL; | |
2221 | ||
2222 | ||
2223 | switch (cmd){ | |
2224 | ||
2225 | case SIOC_WANPIPE_ACCEPT_CALL: | |
2226 | ||
2227 | if (sk->sk_state != WANSOCK_CONNECTING) { | |
2228 | err = -EHOSTDOWN; | |
2229 | break; | |
2230 | } | |
2231 | ||
2232 | err = execute_command(sk,X25_ACCEPT_CALL,0); | |
2233 | if (err < 0) | |
2234 | break; | |
2235 | ||
2236 | /* Update. Mar6 2000. | |
2237 | * Do not set the sock lcn number here, since | |
2238 | * it is done in wanpipe_listen_rcv(). | |
2239 | */ | |
2240 | if (sk->sk_state == WANSOCK_CONNECTED) { | |
2241 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; | |
2242 | DBG_PRINTK(KERN_INFO "\nwansock: Accept OK %i\n", | |
2243 | wp->lcn); | |
2244 | err = 0; | |
2245 | ||
2246 | }else{ | |
2247 | DBG_PRINTK (KERN_INFO "\nwansock: Accept Failed %i\n", | |
2248 | wp->lcn); | |
2249 | wp->lcn = 0; | |
2250 | err = -ECONNREFUSED; | |
2251 | } | |
2252 | break; | |
2253 | ||
2254 | case SIOC_WANPIPE_CLEAR_CALL: | |
2255 | ||
2256 | if (sk->sk_state == WANSOCK_DISCONNECTED) { | |
2257 | err = -EINVAL; | |
2258 | break; | |
2259 | } | |
2260 | ||
2261 | ||
2262 | /* Check if data buffers are pending for transmission, | |
2263 | * if so, check whether user wants to wait until data | |
2264 | * is transmitted, or clear a call and drop packets */ | |
2265 | ||
2266 | if (atomic_read(&sk->sk_wmem_alloc) || | |
2267 | check_driver_busy(sk)) { | |
2268 | mbox_cmd_t *mbox = wp->mbox; | |
2269 | if (mbox->cmd.qdm & 0x80){ | |
2270 | mbox->cmd.result = 0x35; | |
2271 | err = -EAGAIN; | |
2272 | break; | |
2273 | } | |
2274 | } | |
2275 | ||
2276 | sk->sk_state = WANSOCK_DISCONNECTING; | |
2277 | ||
2278 | err = execute_command(sk,X25_CLEAR_CALL,0); | |
2279 | if (err < 0) | |
2280 | break; | |
2281 | ||
2282 | err = -ECONNREFUSED; | |
2283 | if (sk->sk_state == WANSOCK_DISCONNECTED) { | |
2284 | DBG_PRINTK(KERN_INFO "\nwansock: CLEAR OK %i\n", | |
2285 | wp->lcn); | |
2286 | wp->lcn = 0; | |
2287 | err = 0; | |
2288 | } | |
2289 | break; | |
2290 | ||
2291 | case SIOC_WANPIPE_RESET_CALL: | |
2292 | ||
2293 | if (sk->sk_state != WANSOCK_CONNECTED) { | |
2294 | err = -EINVAL; | |
2295 | break; | |
2296 | } | |
2297 | ||
2298 | ||
2299 | /* Check if data buffers are pending for transmission, | |
2300 | * if so, check whether user wants to wait until data | |
2301 | * is transmitted, or reset a call and drop packets */ | |
2302 | ||
2303 | if (atomic_read(&sk->sk_wmem_alloc) || | |
2304 | check_driver_busy(sk)) { | |
2305 | mbox_cmd_t *mbox = wp->mbox; | |
2306 | if (mbox->cmd.qdm & 0x80){ | |
2307 | mbox->cmd.result = 0x35; | |
2308 | err = -EAGAIN; | |
2309 | break; | |
2310 | } | |
2311 | } | |
2312 | ||
2313 | ||
2314 | err = execute_command(sk, X25_RESET,0); | |
2315 | if (err < 0) | |
2316 | break; | |
2317 | ||
2318 | err = mbox_ptr->cmd.result; | |
2319 | break; | |
2320 | ||
2321 | ||
2322 | case X25_PLACE_CALL: | |
2323 | ||
2324 | err=execute_command(sk,X25_PLACE_CALL,flags); | |
2325 | if (err < 0) | |
2326 | break; | |
2327 | ||
2328 | if (sk->sk_state == WANSOCK_CONNECTED) { | |
2329 | ||
2330 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; | |
2331 | ||
2332 | DBG_PRINTK(KERN_INFO "\nwansock: PLACE CALL OK %i\n", | |
2333 | wp->lcn); | |
2334 | err = 0; | |
2335 | ||
2336 | } else if (sk->sk_state == WANSOCK_CONNECTING && | |
2337 | (flags & O_NONBLOCK)) { | |
2338 | wp->lcn = ((mbox_cmd_t*)wp->mbox)->cmd.lcn; | |
2339 | DBG_PRINTK(KERN_INFO "\nwansock: Place Call OK: Waiting %i\n", | |
2340 | wp->lcn); | |
2341 | ||
2342 | err = 0; | |
2343 | ||
2344 | }else{ | |
2345 | DBG_PRINTK(KERN_INFO "\nwansock: Place call Failed\n"); | |
2346 | err = -ECONNREFUSED; | |
2347 | } | |
2348 | ||
2349 | break; | |
2350 | ||
2351 | default: | |
2352 | return -EINVAL; | |
2353 | } | |
2354 | ||
2355 | return err; | |
2356 | } | |
2357 | ||
2358 | static int check_driver_busy (struct sock *sk) | |
2359 | { | |
2360 | struct net_device *dev = dev_get_by_index(sk->sk_bound_dev_if); | |
2361 | wanpipe_common_t *chan; | |
2362 | ||
2363 | if (!dev) | |
2364 | return 0; | |
2365 | ||
2366 | dev_put(dev); | |
2367 | ||
2368 | if ((chan=dev->priv) == NULL) | |
2369 | return 0; | |
2370 | ||
2371 | return atomic_read(&chan->driver_busy); | |
2372 | } | |
2373 | ||
2374 | ||
2375 | /*====================================================================== | |
2376 | * wanpipe_accept | |
2377 | * | |
2378 | * ACCEPT() System call. X25API Specific function. | |
2379 | * For each incoming call, create a new socket and | |
2380 | * return it to the user. | |
2381 | *=====================================================================*/ | |
2382 | ||
2383 | static int wanpipe_accept(struct socket *sock, struct socket *newsock, int flags) | |
2384 | { | |
2385 | struct sock *sk; | |
2386 | struct sock *newsk; | |
2387 | struct sk_buff *skb; | |
2388 | DECLARE_WAITQUEUE(wait, current); | |
2389 | int err=0; | |
2390 | ||
2391 | if (newsock->sk != NULL){ | |
2392 | wanpipe_kill_sock_accept(newsock->sk); | |
2393 | newsock->sk=NULL; | |
2394 | } | |
2395 | ||
2396 | if ((sk = sock->sk) == NULL) | |
2397 | return -EINVAL; | |
2398 | ||
2399 | if (sk->sk_type != SOCK_RAW) | |
2400 | return -EOPNOTSUPP; | |
2401 | ||
2402 | if (sk->sk_state != WANSOCK_LISTEN) | |
2403 | return -EINVAL; | |
2404 | ||
2405 | if (wp_sk(sk)->num != htons(X25_PROT)) | |
2406 | return -EINVAL; | |
2407 | ||
2408 | add_wait_queue(sk->sk_sleep,&wait); | |
2409 | current->state = TASK_INTERRUPTIBLE; | |
2410 | for (;;){ | |
2411 | skb = skb_dequeue(&sk->sk_receive_queue); | |
2412 | if (skb){ | |
2413 | err=0; | |
2414 | break; | |
2415 | } | |
2416 | if (signal_pending(current)) { | |
2417 | err = -ERESTARTSYS; | |
2418 | break; | |
2419 | } | |
2420 | schedule(); | |
2421 | } | |
2422 | current->state = TASK_RUNNING; | |
2423 | remove_wait_queue(sk->sk_sleep,&wait); | |
2424 | ||
2425 | if (err != 0) | |
2426 | return err; | |
2427 | ||
2428 | newsk = get_newsk_from_skb(skb); | |
2429 | if (!newsk){ | |
2430 | return -EINVAL; | |
2431 | } | |
2432 | ||
2433 | set_bit(1,&wanpipe_tx_critical); | |
2434 | write_lock(&wanpipe_sklist_lock); | |
2435 | sk_add_node(newsk, &wanpipe_sklist); | |
2436 | write_unlock(&wanpipe_sklist_lock); | |
2437 | clear_bit(1,&wanpipe_tx_critical); | |
2438 | ||
2439 | newsk->sk_socket = newsock; | |
2440 | newsk->sk_sleep = &newsock->wait; | |
2441 | ||
2442 | /* Now attach up the new socket */ | |
2443 | sk->sk_ack_backlog--; | |
2444 | newsock->sk = newsk; | |
2445 | ||
2446 | kfree_skb(skb); | |
2447 | ||
2448 | DBG_PRINTK(KERN_INFO "\nwansock: ACCEPT Got LCN %i\n", | |
2449 | wp_sk(newsk)->lcn); | |
2450 | return 0; | |
2451 | } | |
2452 | ||
2453 | /*====================================================================== | |
2454 | * get_newsk_from_skb | |
2455 | * | |
2456 | * Accept() uses this function to get the address of the new | |
2457 | * socket structure. | |
2458 | *=====================================================================*/ | |
2459 | ||
2460 | struct sock * get_newsk_from_skb (struct sk_buff *skb) | |
2461 | { | |
2462 | struct net_device *dev = skb->dev; | |
2463 | wanpipe_common_t *chan; | |
2464 | ||
2465 | if (!dev){ | |
2466 | return NULL; | |
2467 | } | |
2468 | ||
2469 | if ((chan = dev->priv) == NULL){ | |
2470 | return NULL; | |
2471 | } | |
2472 | ||
2473 | if (!chan->sk){ | |
2474 | return NULL; | |
2475 | } | |
2476 | return (struct sock *)chan->sk; | |
2477 | } | |
2478 | ||
2479 | /*====================================================================== | |
2480 | * wanpipe_connect | |
2481 | * | |
2482 | * CONNECT() System Call. X25API specific function | |
2483 | * Check the state of the sock, and execute PLACE_CALL command. | |
2484 | * Connect can ether block or return without waiting for connection, | |
2485 | * if specified by user. | |
2486 | *=====================================================================*/ | |
2487 | ||
2488 | static int wanpipe_connect(struct socket *sock, struct sockaddr *uaddr, int addr_len, int flags) | |
2489 | { | |
2490 | struct sock *sk = sock->sk; | |
2491 | struct wan_sockaddr_ll *addr = (struct wan_sockaddr_ll*)uaddr; | |
2492 | struct net_device *dev; | |
2493 | int err; | |
2494 | ||
2495 | if (wp_sk(sk)->num != htons(X25_PROT)) | |
2496 | return -EINVAL; | |
2497 | ||
2498 | if (sk->sk_state == WANSOCK_CONNECTED) | |
2499 | return -EISCONN; /* No reconnect on a seqpacket socket */ | |
2500 | ||
2501 | if (sk->sk_state != WAN_DISCONNECTED) { | |
2502 | printk(KERN_INFO "wansock: Trying to connect on channel NON DISCONNECT\n"); | |
2503 | return -ECONNREFUSED; | |
2504 | } | |
2505 | ||
2506 | sk->sk_state = WANSOCK_DISCONNECTED; | |
2507 | sock->state = SS_UNCONNECTED; | |
2508 | ||
2509 | if (addr_len != sizeof(struct wan_sockaddr_ll)) | |
2510 | return -EINVAL; | |
2511 | ||
2512 | if (addr->sll_family != AF_WANPIPE) | |
2513 | return -EINVAL; | |
2514 | ||
2515 | if ((dev = dev_get_by_index(sk->sk_bound_dev_if)) == NULL) | |
2516 | return -ENETUNREACH; | |
2517 | ||
2518 | dev_put(dev); | |
2519 | ||
2520 | if (!sock_flag(sk, SOCK_ZAPPED)) /* Must bind first - autobinding does not work */ | |
2521 | return -EINVAL; | |
2522 | ||
2523 | sock->state = SS_CONNECTING; | |
2524 | sk->sk_state = WANSOCK_CONNECTING; | |
2525 | ||
2526 | if (!wp_sk(sk)->mbox) { | |
2527 | if (wp_sk (sk)->svc) | |
2528 | return -EINVAL; | |
2529 | else { | |
2530 | int err; | |
2531 | if ((err=set_ioctl_cmd(sk,NULL)) < 0) | |
2532 | return err; | |
2533 | } | |
2534 | } | |
2535 | ||
2536 | if ((err=wanpipe_exec_cmd(sk, X25_PLACE_CALL,flags)) != 0){ | |
2537 | sock->state = SS_UNCONNECTED; | |
2538 | sk->sk_state = WANSOCK_CONNECTED; | |
2539 | return err; | |
2540 | } | |
2541 | ||
2542 | if (sk->sk_state != WANSOCK_CONNECTED && (flags & O_NONBLOCK)) { | |
2543 | return 0; | |
2544 | } | |
2545 | ||
2546 | if (sk->sk_state != WANSOCK_CONNECTED) { | |
2547 | sock->state = SS_UNCONNECTED; | |
2548 | return -ECONNREFUSED; | |
2549 | } | |
2550 | ||
2551 | sock->state = SS_CONNECTED; | |
2552 | return 0; | |
2553 | } | |
2554 | ||
2555 | struct proto_ops wanpipe_ops = { | |
2556 | .family = PF_WANPIPE, | |
2557 | .owner = THIS_MODULE, | |
2558 | .release = wanpipe_release, | |
2559 | .bind = wanpipe_bind, | |
2560 | .connect = wanpipe_connect, | |
2561 | .socketpair = sock_no_socketpair, | |
2562 | .accept = wanpipe_accept, | |
2563 | .getname = wanpipe_getname, | |
2564 | .poll = wanpipe_poll, | |
2565 | .ioctl = wanpipe_ioctl, | |
2566 | .listen = wanpipe_listen, | |
2567 | .shutdown = sock_no_shutdown, | |
2568 | .setsockopt = sock_no_setsockopt, | |
2569 | .getsockopt = sock_no_getsockopt, | |
2570 | .sendmsg = wanpipe_sendmsg, | |
2571 | .recvmsg = wanpipe_recvmsg | |
2572 | }; | |
2573 | ||
2574 | static struct net_proto_family wanpipe_family_ops = { | |
2575 | .family = PF_WANPIPE, | |
2576 | .create = wanpipe_create, | |
2577 | .owner = THIS_MODULE, | |
2578 | }; | |
2579 | ||
2580 | struct notifier_block wanpipe_netdev_notifier = { | |
2581 | .notifier_call = wanpipe_notifier, | |
2582 | }; | |
2583 | ||
2584 | ||
2585 | #ifdef MODULE | |
2586 | void cleanup_module(void) | |
2587 | { | |
2588 | printk(KERN_INFO "wansock: Cleaning up \n"); | |
2589 | unregister_netdevice_notifier(&wanpipe_netdev_notifier); | |
2590 | sock_unregister(PF_WANPIPE); | |
2591 | proto_unregister(&wanpipe_proto); | |
2592 | } | |
2593 | ||
2594 | int init_module(void) | |
2595 | { | |
2596 | int rc; | |
2597 | ||
2598 | printk(KERN_INFO "wansock: Registering Socket \n"); | |
2599 | ||
2600 | rc = proto_register(&wanpipe_proto, 0); | |
2601 | if (rc != 0) | |
2602 | goto out; | |
2603 | ||
2604 | sock_register(&wanpipe_family_ops); | |
2605 | register_netdevice_notifier(&wanpipe_netdev_notifier); | |
2606 | out: | |
2607 | return rc; | |
2608 | } | |
2609 | #endif | |
2610 | MODULE_LICENSE("GPL"); | |
2611 | MODULE_ALIAS_NETPROTO(PF_WANPIPE); |