Root/
1 | /* net/atm/common.c - ATM sockets (common part for PVC and SVC) */ |
2 | |
3 | /* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */ |
4 | |
5 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
6 | |
7 | #include <linux/module.h> |
8 | #include <linux/kmod.h> |
9 | #include <linux/net.h> /* struct socket, struct proto_ops */ |
10 | #include <linux/atm.h> /* ATM stuff */ |
11 | #include <linux/atmdev.h> |
12 | #include <linux/socket.h> /* SOL_SOCKET */ |
13 | #include <linux/errno.h> /* error codes */ |
14 | #include <linux/capability.h> |
15 | #include <linux/mm.h> |
16 | #include <linux/sched.h> |
17 | #include <linux/time.h> /* struct timeval */ |
18 | #include <linux/skbuff.h> |
19 | #include <linux/bitops.h> |
20 | #include <linux/init.h> |
21 | #include <linux/slab.h> |
22 | #include <net/sock.h> /* struct sock */ |
23 | #include <linux/uaccess.h> |
24 | #include <linux/poll.h> |
25 | |
26 | #include <asm/atomic.h> |
27 | |
28 | #include "resources.h" /* atm_find_dev */ |
29 | #include "common.h" /* prototypes */ |
30 | #include "protocols.h" /* atm_init_<transport> */ |
31 | #include "addr.h" /* address registry */ |
32 | #include "signaling.h" /* for WAITING and sigd_attach */ |
33 | |
34 | struct hlist_head vcc_hash[VCC_HTABLE_SIZE]; |
35 | EXPORT_SYMBOL(vcc_hash); |
36 | |
37 | DEFINE_RWLOCK(vcc_sklist_lock); |
38 | EXPORT_SYMBOL(vcc_sklist_lock); |
39 | |
40 | static void __vcc_insert_socket(struct sock *sk) |
41 | { |
42 | struct atm_vcc *vcc = atm_sk(sk); |
43 | struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; |
44 | sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); |
45 | sk_add_node(sk, head); |
46 | } |
47 | |
48 | void vcc_insert_socket(struct sock *sk) |
49 | { |
50 | write_lock_irq(&vcc_sklist_lock); |
51 | __vcc_insert_socket(sk); |
52 | write_unlock_irq(&vcc_sklist_lock); |
53 | } |
54 | EXPORT_SYMBOL(vcc_insert_socket); |
55 | |
56 | static void vcc_remove_socket(struct sock *sk) |
57 | { |
58 | write_lock_irq(&vcc_sklist_lock); |
59 | sk_del_node_init(sk); |
60 | write_unlock_irq(&vcc_sklist_lock); |
61 | } |
62 | |
63 | static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size) |
64 | { |
65 | struct sk_buff *skb; |
66 | struct sock *sk = sk_atm(vcc); |
67 | |
68 | if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { |
69 | pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", |
70 | sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); |
71 | return NULL; |
72 | } |
73 | while (!(skb = alloc_skb(size, GFP_KERNEL))) |
74 | schedule(); |
75 | pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); |
76 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); |
77 | return skb; |
78 | } |
79 | |
80 | static void vcc_sock_destruct(struct sock *sk) |
81 | { |
82 | if (atomic_read(&sk->sk_rmem_alloc)) |
83 | printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", |
84 | __func__, atomic_read(&sk->sk_rmem_alloc)); |
85 | |
86 | if (atomic_read(&sk->sk_wmem_alloc)) |
87 | printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", |
88 | __func__, atomic_read(&sk->sk_wmem_alloc)); |
89 | } |
90 | |
91 | static void vcc_def_wakeup(struct sock *sk) |
92 | { |
93 | read_lock(&sk->sk_callback_lock); |
94 | if (sk_has_sleeper(sk)) |
95 | wake_up(sk->sk_sleep); |
96 | read_unlock(&sk->sk_callback_lock); |
97 | } |
98 | |
99 | static inline int vcc_writable(struct sock *sk) |
100 | { |
101 | struct atm_vcc *vcc = atm_sk(sk); |
102 | |
103 | return (vcc->qos.txtp.max_sdu + |
104 | atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; |
105 | } |
106 | |
107 | static void vcc_write_space(struct sock *sk) |
108 | { |
109 | read_lock(&sk->sk_callback_lock); |
110 | |
111 | if (vcc_writable(sk)) { |
112 | if (sk_has_sleeper(sk)) |
113 | wake_up_interruptible(sk->sk_sleep); |
114 | |
115 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
116 | } |
117 | |
118 | read_unlock(&sk->sk_callback_lock); |
119 | } |
120 | |
121 | static struct proto vcc_proto = { |
122 | .name = "VCC", |
123 | .owner = THIS_MODULE, |
124 | .obj_size = sizeof(struct atm_vcc), |
125 | }; |
126 | |
127 | int vcc_create(struct net *net, struct socket *sock, int protocol, int family) |
128 | { |
129 | struct sock *sk; |
130 | struct atm_vcc *vcc; |
131 | |
132 | sock->sk = NULL; |
133 | if (sock->type == SOCK_STREAM) |
134 | return -EINVAL; |
135 | sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto); |
136 | if (!sk) |
137 | return -ENOMEM; |
138 | sock_init_data(sock, sk); |
139 | sk->sk_state_change = vcc_def_wakeup; |
140 | sk->sk_write_space = vcc_write_space; |
141 | |
142 | vcc = atm_sk(sk); |
143 | vcc->dev = NULL; |
144 | memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); |
145 | memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); |
146 | vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ |
147 | atomic_set(&sk->sk_wmem_alloc, 1); |
148 | atomic_set(&sk->sk_rmem_alloc, 0); |
149 | vcc->push = NULL; |
150 | vcc->pop = NULL; |
151 | vcc->push_oam = NULL; |
152 | vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ |
153 | vcc->atm_options = vcc->aal_options = 0; |
154 | sk->sk_destruct = vcc_sock_destruct; |
155 | return 0; |
156 | } |
157 | |
158 | static void vcc_destroy_socket(struct sock *sk) |
159 | { |
160 | struct atm_vcc *vcc = atm_sk(sk); |
161 | struct sk_buff *skb; |
162 | |
163 | set_bit(ATM_VF_CLOSE, &vcc->flags); |
164 | clear_bit(ATM_VF_READY, &vcc->flags); |
165 | if (vcc->dev) { |
166 | if (vcc->dev->ops->close) |
167 | vcc->dev->ops->close(vcc); |
168 | if (vcc->push) |
169 | vcc->push(vcc, NULL); /* atmarpd has no push */ |
170 | |
171 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
172 | atm_return(vcc, skb->truesize); |
173 | kfree_skb(skb); |
174 | } |
175 | |
176 | module_put(vcc->dev->ops->owner); |
177 | atm_dev_put(vcc->dev); |
178 | } |
179 | |
180 | vcc_remove_socket(sk); |
181 | } |
182 | |
183 | int vcc_release(struct socket *sock) |
184 | { |
185 | struct sock *sk = sock->sk; |
186 | |
187 | if (sk) { |
188 | lock_sock(sk); |
189 | vcc_destroy_socket(sock->sk); |
190 | release_sock(sk); |
191 | sock_put(sk); |
192 | } |
193 | |
194 | return 0; |
195 | } |
196 | |
197 | void vcc_release_async(struct atm_vcc *vcc, int reply) |
198 | { |
199 | struct sock *sk = sk_atm(vcc); |
200 | |
201 | set_bit(ATM_VF_CLOSE, &vcc->flags); |
202 | sk->sk_shutdown |= RCV_SHUTDOWN; |
203 | sk->sk_err = -reply; |
204 | clear_bit(ATM_VF_WAITING, &vcc->flags); |
205 | sk->sk_state_change(sk); |
206 | } |
207 | EXPORT_SYMBOL(vcc_release_async); |
208 | |
209 | |
210 | void atm_dev_release_vccs(struct atm_dev *dev) |
211 | { |
212 | int i; |
213 | |
214 | write_lock_irq(&vcc_sklist_lock); |
215 | for (i = 0; i < VCC_HTABLE_SIZE; i++) { |
216 | struct hlist_head *head = &vcc_hash[i]; |
217 | struct hlist_node *node, *tmp; |
218 | struct sock *s; |
219 | struct atm_vcc *vcc; |
220 | |
221 | sk_for_each_safe(s, node, tmp, head) { |
222 | vcc = atm_sk(s); |
223 | if (vcc->dev == dev) { |
224 | vcc_release_async(vcc, -EPIPE); |
225 | sk_del_node_init(s); |
226 | } |
227 | } |
228 | } |
229 | write_unlock_irq(&vcc_sklist_lock); |
230 | } |
231 | |
232 | static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) |
233 | { |
234 | int max_sdu; |
235 | |
236 | if (!tp->traffic_class) |
237 | return 0; |
238 | switch (aal) { |
239 | case ATM_AAL0: |
240 | max_sdu = ATM_CELL_SIZE-1; |
241 | break; |
242 | case ATM_AAL34: |
243 | max_sdu = ATM_MAX_AAL34_PDU; |
244 | break; |
245 | default: |
246 | pr_warning("AAL problems ... (%d)\n", aal); |
247 | /* fall through */ |
248 | case ATM_AAL5: |
249 | max_sdu = ATM_MAX_AAL5_PDU; |
250 | } |
251 | if (!tp->max_sdu) |
252 | tp->max_sdu = max_sdu; |
253 | else if (tp->max_sdu > max_sdu) |
254 | return -EINVAL; |
255 | if (!tp->max_cdv) |
256 | tp->max_cdv = ATM_MAX_CDV; |
257 | return 0; |
258 | } |
259 | |
260 | static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) |
261 | { |
262 | struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; |
263 | struct hlist_node *node; |
264 | struct sock *s; |
265 | struct atm_vcc *walk; |
266 | |
267 | sk_for_each(s, node, head) { |
268 | walk = atm_sk(s); |
269 | if (walk->dev != vcc->dev) |
270 | continue; |
271 | if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && |
272 | walk->vci == vci && ((walk->qos.txtp.traffic_class != |
273 | ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || |
274 | (walk->qos.rxtp.traffic_class != ATM_NONE && |
275 | vcc->qos.rxtp.traffic_class != ATM_NONE))) |
276 | return -EADDRINUSE; |
277 | } |
278 | |
279 | /* allow VCCs with same VPI/VCI iff they don't collide on |
280 | TX/RX (but we may refuse such sharing for other reasons, |
281 | e.g. if protocol requires to have both channels) */ |
282 | |
283 | return 0; |
284 | } |
285 | |
286 | static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) |
287 | { |
288 | static short p; /* poor man's per-device cache */ |
289 | static int c; |
290 | short old_p; |
291 | int old_c; |
292 | int err; |
293 | |
294 | if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { |
295 | err = check_ci(vcc, *vpi, *vci); |
296 | return err; |
297 | } |
298 | /* last scan may have left values out of bounds for current device */ |
299 | if (*vpi != ATM_VPI_ANY) |
300 | p = *vpi; |
301 | else if (p >= 1 << vcc->dev->ci_range.vpi_bits) |
302 | p = 0; |
303 | if (*vci != ATM_VCI_ANY) |
304 | c = *vci; |
305 | else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) |
306 | c = ATM_NOT_RSV_VCI; |
307 | old_p = p; |
308 | old_c = c; |
309 | do { |
310 | if (!check_ci(vcc, p, c)) { |
311 | *vpi = p; |
312 | *vci = c; |
313 | return 0; |
314 | } |
315 | if (*vci == ATM_VCI_ANY) { |
316 | c++; |
317 | if (c >= 1 << vcc->dev->ci_range.vci_bits) |
318 | c = ATM_NOT_RSV_VCI; |
319 | } |
320 | if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && |
321 | *vpi == ATM_VPI_ANY) { |
322 | p++; |
323 | if (p >= 1 << vcc->dev->ci_range.vpi_bits) |
324 | p = 0; |
325 | } |
326 | } while (old_p != p || old_c != c); |
327 | return -EADDRINUSE; |
328 | } |
329 | |
330 | static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, |
331 | int vci) |
332 | { |
333 | struct sock *sk = sk_atm(vcc); |
334 | int error; |
335 | |
336 | if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && |
337 | vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && |
338 | vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) |
339 | return -EINVAL; |
340 | if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) |
341 | return -EPERM; |
342 | error = -ENODEV; |
343 | if (!try_module_get(dev->ops->owner)) |
344 | return error; |
345 | vcc->dev = dev; |
346 | write_lock_irq(&vcc_sklist_lock); |
347 | if (test_bit(ATM_DF_REMOVED, &dev->flags) || |
348 | (error = find_ci(vcc, &vpi, &vci))) { |
349 | write_unlock_irq(&vcc_sklist_lock); |
350 | goto fail_module_put; |
351 | } |
352 | vcc->vpi = vpi; |
353 | vcc->vci = vci; |
354 | __vcc_insert_socket(sk); |
355 | write_unlock_irq(&vcc_sklist_lock); |
356 | switch (vcc->qos.aal) { |
357 | case ATM_AAL0: |
358 | error = atm_init_aal0(vcc); |
359 | vcc->stats = &dev->stats.aal0; |
360 | break; |
361 | case ATM_AAL34: |
362 | error = atm_init_aal34(vcc); |
363 | vcc->stats = &dev->stats.aal34; |
364 | break; |
365 | case ATM_NO_AAL: |
366 | /* ATM_AAL5 is also used in the "0 for default" case */ |
367 | vcc->qos.aal = ATM_AAL5; |
368 | /* fall through */ |
369 | case ATM_AAL5: |
370 | error = atm_init_aal5(vcc); |
371 | vcc->stats = &dev->stats.aal5; |
372 | break; |
373 | default: |
374 | error = -EPROTOTYPE; |
375 | } |
376 | if (!error) |
377 | error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); |
378 | if (!error) |
379 | error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); |
380 | if (error) |
381 | goto fail; |
382 | pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); |
383 | pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", |
384 | vcc->qos.txtp.traffic_class, |
385 | vcc->qos.txtp.min_pcr, |
386 | vcc->qos.txtp.max_pcr, |
387 | vcc->qos.txtp.max_sdu); |
388 | pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", |
389 | vcc->qos.rxtp.traffic_class, |
390 | vcc->qos.rxtp.min_pcr, |
391 | vcc->qos.rxtp.max_pcr, |
392 | vcc->qos.rxtp.max_sdu); |
393 | |
394 | if (dev->ops->open) { |
395 | error = dev->ops->open(vcc); |
396 | if (error) |
397 | goto fail; |
398 | } |
399 | return 0; |
400 | |
401 | fail: |
402 | vcc_remove_socket(sk); |
403 | fail_module_put: |
404 | module_put(dev->ops->owner); |
405 | /* ensure we get dev module ref count correct */ |
406 | vcc->dev = NULL; |
407 | return error; |
408 | } |
409 | |
410 | int vcc_connect(struct socket *sock, int itf, short vpi, int vci) |
411 | { |
412 | struct atm_dev *dev; |
413 | struct atm_vcc *vcc = ATM_SD(sock); |
414 | int error; |
415 | |
416 | pr_debug("(vpi %d, vci %d)\n", vpi, vci); |
417 | if (sock->state == SS_CONNECTED) |
418 | return -EISCONN; |
419 | if (sock->state != SS_UNCONNECTED) |
420 | return -EINVAL; |
421 | if (!(vpi || vci)) |
422 | return -EINVAL; |
423 | |
424 | if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) |
425 | clear_bit(ATM_VF_PARTIAL, &vcc->flags); |
426 | else |
427 | if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) |
428 | return -EINVAL; |
429 | pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " |
430 | "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", |
431 | vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, |
432 | vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, |
433 | vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, |
434 | vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, |
435 | vcc->qos.aal == ATM_AAL5 ? "" : |
436 | vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", |
437 | vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); |
438 | if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) |
439 | return -EBADFD; |
440 | if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || |
441 | vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) |
442 | return -EINVAL; |
443 | if (likely(itf != ATM_ITF_ANY)) { |
444 | dev = try_then_request_module(atm_dev_lookup(itf), |
445 | "atm-device-%d", itf); |
446 | } else { |
447 | dev = NULL; |
448 | mutex_lock(&atm_dev_mutex); |
449 | if (!list_empty(&atm_devs)) { |
450 | dev = list_entry(atm_devs.next, |
451 | struct atm_dev, dev_list); |
452 | atm_dev_hold(dev); |
453 | } |
454 | mutex_unlock(&atm_dev_mutex); |
455 | } |
456 | if (!dev) |
457 | return -ENODEV; |
458 | error = __vcc_connect(vcc, dev, vpi, vci); |
459 | if (error) { |
460 | atm_dev_put(dev); |
461 | return error; |
462 | } |
463 | if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) |
464 | set_bit(ATM_VF_PARTIAL, &vcc->flags); |
465 | if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) |
466 | sock->state = SS_CONNECTED; |
467 | return 0; |
468 | } |
469 | |
470 | int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, |
471 | size_t size, int flags) |
472 | { |
473 | struct sock *sk = sock->sk; |
474 | struct atm_vcc *vcc; |
475 | struct sk_buff *skb; |
476 | int copied, error = -EINVAL; |
477 | |
478 | if (sock->state != SS_CONNECTED) |
479 | return -ENOTCONN; |
480 | if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */ |
481 | return -EOPNOTSUPP; |
482 | vcc = ATM_SD(sock); |
483 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
484 | test_bit(ATM_VF_CLOSE, &vcc->flags) || |
485 | !test_bit(ATM_VF_READY, &vcc->flags)) |
486 | return 0; |
487 | |
488 | skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error); |
489 | if (!skb) |
490 | return error; |
491 | |
492 | copied = skb->len; |
493 | if (copied > size) { |
494 | copied = size; |
495 | msg->msg_flags |= MSG_TRUNC; |
496 | } |
497 | |
498 | error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); |
499 | if (error) |
500 | return error; |
501 | sock_recv_ts_and_drops(msg, sk, skb); |
502 | pr_debug("%d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize); |
503 | atm_return(vcc, skb->truesize); |
504 | skb_free_datagram(sk, skb); |
505 | return copied; |
506 | } |
507 | |
508 | int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
509 | size_t total_len) |
510 | { |
511 | struct sock *sk = sock->sk; |
512 | DEFINE_WAIT(wait); |
513 | struct atm_vcc *vcc; |
514 | struct sk_buff *skb; |
515 | int eff, error; |
516 | const void __user *buff; |
517 | int size; |
518 | |
519 | lock_sock(sk); |
520 | if (sock->state != SS_CONNECTED) { |
521 | error = -ENOTCONN; |
522 | goto out; |
523 | } |
524 | if (m->msg_name) { |
525 | error = -EISCONN; |
526 | goto out; |
527 | } |
528 | if (m->msg_iovlen != 1) { |
529 | error = -ENOSYS; /* fix this later @@@ */ |
530 | goto out; |
531 | } |
532 | buff = m->msg_iov->iov_base; |
533 | size = m->msg_iov->iov_len; |
534 | vcc = ATM_SD(sock); |
535 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
536 | test_bit(ATM_VF_CLOSE, &vcc->flags) || |
537 | !test_bit(ATM_VF_READY, &vcc->flags)) { |
538 | error = -EPIPE; |
539 | send_sig(SIGPIPE, current, 0); |
540 | goto out; |
541 | } |
542 | if (!size) { |
543 | error = 0; |
544 | goto out; |
545 | } |
546 | if (size < 0 || size > vcc->qos.txtp.max_sdu) { |
547 | error = -EMSGSIZE; |
548 | goto out; |
549 | } |
550 | |
551 | eff = (size+3) & ~3; /* align to word boundary */ |
552 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
553 | error = 0; |
554 | while (!(skb = alloc_tx(vcc, eff))) { |
555 | if (m->msg_flags & MSG_DONTWAIT) { |
556 | error = -EAGAIN; |
557 | break; |
558 | } |
559 | schedule(); |
560 | if (signal_pending(current)) { |
561 | error = -ERESTARTSYS; |
562 | break; |
563 | } |
564 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
565 | test_bit(ATM_VF_CLOSE, &vcc->flags) || |
566 | !test_bit(ATM_VF_READY, &vcc->flags)) { |
567 | error = -EPIPE; |
568 | send_sig(SIGPIPE, current, 0); |
569 | break; |
570 | } |
571 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
572 | } |
573 | finish_wait(sk->sk_sleep, &wait); |
574 | if (error) |
575 | goto out; |
576 | skb->dev = NULL; /* for paths shared with net_device interfaces */ |
577 | ATM_SKB(skb)->atm_options = vcc->atm_options; |
578 | if (copy_from_user(skb_put(skb, size), buff, size)) { |
579 | kfree_skb(skb); |
580 | error = -EFAULT; |
581 | goto out; |
582 | } |
583 | if (eff != size) |
584 | memset(skb->data + size, 0, eff-size); |
585 | error = vcc->dev->ops->send(vcc, skb); |
586 | error = error ? error : size; |
587 | out: |
588 | release_sock(sk); |
589 | return error; |
590 | } |
591 | |
592 | unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait) |
593 | { |
594 | struct sock *sk = sock->sk; |
595 | struct atm_vcc *vcc; |
596 | unsigned int mask; |
597 | |
598 | sock_poll_wait(file, sk->sk_sleep, wait); |
599 | mask = 0; |
600 | |
601 | vcc = ATM_SD(sock); |
602 | |
603 | /* exceptional events */ |
604 | if (sk->sk_err) |
605 | mask = POLLERR; |
606 | |
607 | if (test_bit(ATM_VF_RELEASED, &vcc->flags) || |
608 | test_bit(ATM_VF_CLOSE, &vcc->flags)) |
609 | mask |= POLLHUP; |
610 | |
611 | /* readable? */ |
612 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
613 | mask |= POLLIN | POLLRDNORM; |
614 | |
615 | /* writable? */ |
616 | if (sock->state == SS_CONNECTING && |
617 | test_bit(ATM_VF_WAITING, &vcc->flags)) |
618 | return mask; |
619 | |
620 | if (vcc->qos.txtp.traffic_class != ATM_NONE && |
621 | vcc_writable(sk)) |
622 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
623 | |
624 | return mask; |
625 | } |
626 | |
627 | static int atm_change_qos(struct atm_vcc *vcc, struct atm_qos *qos) |
628 | { |
629 | int error; |
630 | |
631 | /* |
632 | * Don't let the QoS change the already connected AAL type nor the |
633 | * traffic class. |
634 | */ |
635 | if (qos->aal != vcc->qos.aal || |
636 | qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class || |
637 | qos->txtp.traffic_class != vcc->qos.txtp.traffic_class) |
638 | return -EINVAL; |
639 | error = adjust_tp(&qos->txtp, qos->aal); |
640 | if (!error) |
641 | error = adjust_tp(&qos->rxtp, qos->aal); |
642 | if (error) |
643 | return error; |
644 | if (!vcc->dev->ops->change_qos) |
645 | return -EOPNOTSUPP; |
646 | if (sk_atm(vcc)->sk_family == AF_ATMPVC) |
647 | return vcc->dev->ops->change_qos(vcc, qos, ATM_MF_SET); |
648 | return svc_change_qos(vcc, qos); |
649 | } |
650 | |
651 | static int check_tp(const struct atm_trafprm *tp) |
652 | { |
653 | /* @@@ Should be merged with adjust_tp */ |
654 | if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) |
655 | return 0; |
656 | if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr && |
657 | !tp->max_pcr) |
658 | return -EINVAL; |
659 | if (tp->min_pcr == ATM_MAX_PCR) |
660 | return -EINVAL; |
661 | if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR && |
662 | tp->min_pcr > tp->max_pcr) |
663 | return -EINVAL; |
664 | /* |
665 | * We allow pcr to be outside [min_pcr,max_pcr], because later |
666 | * adjustment may still push it in the valid range. |
667 | */ |
668 | return 0; |
669 | } |
670 | |
671 | static int check_qos(const struct atm_qos *qos) |
672 | { |
673 | int error; |
674 | |
675 | if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class) |
676 | return -EINVAL; |
677 | if (qos->txtp.traffic_class != qos->rxtp.traffic_class && |
678 | qos->txtp.traffic_class && qos->rxtp.traffic_class && |
679 | qos->txtp.traffic_class != ATM_ANYCLASS && |
680 | qos->rxtp.traffic_class != ATM_ANYCLASS) |
681 | return -EINVAL; |
682 | error = check_tp(&qos->txtp); |
683 | if (error) |
684 | return error; |
685 | return check_tp(&qos->rxtp); |
686 | } |
687 | |
688 | int vcc_setsockopt(struct socket *sock, int level, int optname, |
689 | char __user *optval, unsigned int optlen) |
690 | { |
691 | struct atm_vcc *vcc; |
692 | unsigned long value; |
693 | int error; |
694 | |
695 | if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) |
696 | return -EINVAL; |
697 | |
698 | vcc = ATM_SD(sock); |
699 | switch (optname) { |
700 | case SO_ATMQOS: |
701 | { |
702 | struct atm_qos qos; |
703 | |
704 | if (copy_from_user(&qos, optval, sizeof(qos))) |
705 | return -EFAULT; |
706 | error = check_qos(&qos); |
707 | if (error) |
708 | return error; |
709 | if (sock->state == SS_CONNECTED) |
710 | return atm_change_qos(vcc, &qos); |
711 | if (sock->state != SS_UNCONNECTED) |
712 | return -EBADFD; |
713 | vcc->qos = qos; |
714 | set_bit(ATM_VF_HASQOS, &vcc->flags); |
715 | return 0; |
716 | } |
717 | case SO_SETCLP: |
718 | if (get_user(value, (unsigned long __user *)optval)) |
719 | return -EFAULT; |
720 | if (value) |
721 | vcc->atm_options |= ATM_ATMOPT_CLP; |
722 | else |
723 | vcc->atm_options &= ~ATM_ATMOPT_CLP; |
724 | return 0; |
725 | default: |
726 | if (level == SOL_SOCKET) |
727 | return -EINVAL; |
728 | break; |
729 | } |
730 | if (!vcc->dev || !vcc->dev->ops->setsockopt) |
731 | return -EINVAL; |
732 | return vcc->dev->ops->setsockopt(vcc, level, optname, optval, optlen); |
733 | } |
734 | |
735 | int vcc_getsockopt(struct socket *sock, int level, int optname, |
736 | char __user *optval, int __user *optlen) |
737 | { |
738 | struct atm_vcc *vcc; |
739 | int len; |
740 | |
741 | if (get_user(len, optlen)) |
742 | return -EFAULT; |
743 | if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname)) |
744 | return -EINVAL; |
745 | |
746 | vcc = ATM_SD(sock); |
747 | switch (optname) { |
748 | case SO_ATMQOS: |
749 | if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) |
750 | return -EINVAL; |
751 | return copy_to_user(optval, &vcc->qos, sizeof(vcc->qos)) |
752 | ? -EFAULT : 0; |
753 | case SO_SETCLP: |
754 | return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 : 0, |
755 | (unsigned long __user *)optval) ? -EFAULT : 0; |
756 | case SO_ATMPVC: |
757 | { |
758 | struct sockaddr_atmpvc pvc; |
759 | |
760 | if (!vcc->dev || !test_bit(ATM_VF_ADDR, &vcc->flags)) |
761 | return -ENOTCONN; |
762 | pvc.sap_family = AF_ATMPVC; |
763 | pvc.sap_addr.itf = vcc->dev->number; |
764 | pvc.sap_addr.vpi = vcc->vpi; |
765 | pvc.sap_addr.vci = vcc->vci; |
766 | return copy_to_user(optval, &pvc, sizeof(pvc)) ? -EFAULT : 0; |
767 | } |
768 | default: |
769 | if (level == SOL_SOCKET) |
770 | return -EINVAL; |
771 | break; |
772 | } |
773 | if (!vcc->dev || !vcc->dev->ops->getsockopt) |
774 | return -EINVAL; |
775 | return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len); |
776 | } |
777 | |
778 | static int __init atm_init(void) |
779 | { |
780 | int error; |
781 | |
782 | error = proto_register(&vcc_proto, 0); |
783 | if (error < 0) |
784 | goto out; |
785 | error = atmpvc_init(); |
786 | if (error < 0) { |
787 | pr_err("atmpvc_init() failed with %d\n", error); |
788 | goto out_unregister_vcc_proto; |
789 | } |
790 | error = atmsvc_init(); |
791 | if (error < 0) { |
792 | pr_err("atmsvc_init() failed with %d\n", error); |
793 | goto out_atmpvc_exit; |
794 | } |
795 | error = atm_proc_init(); |
796 | if (error < 0) { |
797 | pr_err("atm_proc_init() failed with %d\n", error); |
798 | goto out_atmsvc_exit; |
799 | } |
800 | error = atm_sysfs_init(); |
801 | if (error < 0) { |
802 | pr_err("atm_sysfs_init() failed with %d\n", error); |
803 | goto out_atmproc_exit; |
804 | } |
805 | out: |
806 | return error; |
807 | out_atmproc_exit: |
808 | atm_proc_exit(); |
809 | out_atmsvc_exit: |
810 | atmsvc_exit(); |
811 | out_atmpvc_exit: |
812 | atmsvc_exit(); |
813 | out_unregister_vcc_proto: |
814 | proto_unregister(&vcc_proto); |
815 | goto out; |
816 | } |
817 | |
818 | static void __exit atm_exit(void) |
819 | { |
820 | atm_proc_exit(); |
821 | atm_sysfs_exit(); |
822 | atmsvc_exit(); |
823 | atmpvc_exit(); |
824 | proto_unregister(&vcc_proto); |
825 | } |
826 | |
827 | subsys_initcall(atm_init); |
828 | |
829 | module_exit(atm_exit); |
830 | |
831 | MODULE_LICENSE("GPL"); |
832 | MODULE_ALIAS_NETPROTO(PF_ATMPVC); |
833 | MODULE_ALIAS_NETPROTO(PF_ATMSVC); |
834 |
Branches:
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Tags:
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v2.6.34-rc5
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