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USB: cp210x: Add Renesas RX-Stick device ID
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / phonet / pep.c
blobc66c3481f77516a1db0f3b4d824765999630c7a3
1 /*
2 * File: pep.c
3 *
4 * Phonet pipe protocol end point socket
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
8 * Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/socket.h>
27 #include <net/sock.h>
28 #include <net/tcp_states.h>
29 #include <asm/ioctls.h>
30
31 #include <linux/phonet.h>
32 #include <net/phonet/phonet.h>
33 #include <net/phonet/pep.h>
34 #include <net/phonet/gprs.h>
35
36 /* sk_state values:
37 * TCP_CLOSE sock not in use yet
38 * TCP_CLOSE_WAIT disconnected pipe
39 * TCP_LISTEN listening pipe endpoint
40 * TCP_SYN_RECV connected pipe in disabled state
41 * TCP_ESTABLISHED connected pipe in enabled state
42 *
43 * pep_sock locking:
44 * - sk_state, ackq, hlist: sock lock needed
45 * - listener: read only
46 * - pipe_handle: read only
47 */
48
49 #define CREDITS_MAX 10
50 #define CREDITS_THR 7
51
52 static const struct sockaddr_pn pipe_srv = {
53 .spn_family = AF_PHONET,
54 .spn_resource = 0xD9, /* pipe service */
55 };
56
57 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
58
59 /* Get the next TLV sub-block. */
60 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
61 void *buf)
62 {
63 void *data = NULL;
64 struct {
65 u8 sb_type;
66 u8 sb_len;
67 } *ph, h;
68 int buflen = *plen;
69
70 ph = skb_header_pointer(skb, 0, 2, &h);
71 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
72 return NULL;
73 ph->sb_len -= 2;
74 *ptype = ph->sb_type;
75 *plen = ph->sb_len;
76
77 if (buflen > ph->sb_len)
78 buflen = ph->sb_len;
79 data = skb_header_pointer(skb, 2, buflen, buf);
80 __skb_pull(skb, 2 + ph->sb_len);
81 return data;
82 }
83
84 static int pep_reply(struct sock *sk, struct sk_buff *oskb,
85 u8 code, const void *data, int len, gfp_t priority)
86 {
87 const struct pnpipehdr *oph = pnp_hdr(oskb);
88 struct pnpipehdr *ph;
89 struct sk_buff *skb;
90
91 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
92 if (!skb)
93 return -ENOMEM;
94 skb_set_owner_w(skb, sk);
95
96 skb_reserve(skb, MAX_PNPIPE_HEADER);
97 __skb_put(skb, len);
98 skb_copy_to_linear_data(skb, data, len);
99 __skb_push(skb, sizeof(*ph));
100 skb_reset_transport_header(skb);
101 ph = pnp_hdr(skb);
102 ph->utid = oph->utid;
103 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
104 ph->pipe_handle = oph->pipe_handle;
105 ph->error_code = code;
106
107 return pn_skb_send(sk, skb, &pipe_srv);
108 }
109
110 #define PAD 0x00
111 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
112 {
113 static const u8 data[20] = {
114 PAD, PAD, PAD, 2 /* sub-blocks */,
115 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
116 PN_MULTI_CREDIT_FLOW_CONTROL,
117 PN_ONE_CREDIT_FLOW_CONTROL,
118 PN_LEGACY_FLOW_CONTROL,
119 PAD,
120 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
121 PN_MULTI_CREDIT_FLOW_CONTROL,
122 PN_ONE_CREDIT_FLOW_CONTROL,
123 PN_LEGACY_FLOW_CONTROL,
124 PAD,
125 };
126
127 might_sleep();
128 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
129 GFP_KERNEL);
130 }
131
132 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
133 {
134 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
135 WARN_ON(code == PN_PIPE_NO_ERROR);
136 return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
137 }
138
139 /* Control requests are not sent by the pipe service and have a specific
140 * message format. */
141 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
142 gfp_t priority)
143 {
144 const struct pnpipehdr *oph = pnp_hdr(oskb);
145 struct sk_buff *skb;
146 struct pnpipehdr *ph;
147 struct sockaddr_pn dst;
148
149 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
150 if (!skb)
151 return -ENOMEM;
152 skb_set_owner_w(skb, sk);
153
154 skb_reserve(skb, MAX_PHONET_HEADER);
155 ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
156
157 ph->utid = oph->utid;
158 ph->message_id = PNS_PEP_CTRL_RESP;
159 ph->pipe_handle = oph->pipe_handle;
160 ph->data[0] = oph->data[1]; /* CTRL id */
161 ph->data[1] = oph->data[0]; /* PEP type */
162 ph->data[2] = code; /* error code, at an usual offset */
163 ph->data[3] = PAD;
164 ph->data[4] = PAD;
165
166 pn_skb_get_src_sockaddr(oskb, &dst);
167 return pn_skb_send(sk, skb, &dst);
168 }
169
170 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
171 {
172 struct pep_sock *pn = pep_sk(sk);
173 struct pnpipehdr *ph;
174 struct sk_buff *skb;
175
176 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
177 if (!skb)
178 return -ENOMEM;
179 skb_set_owner_w(skb, sk);
180
181 skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
182 __skb_push(skb, sizeof(*ph) + 4);
183 skb_reset_transport_header(skb);
184 ph = pnp_hdr(skb);
185 ph->utid = 0;
186 ph->message_id = PNS_PEP_STATUS_IND;
187 ph->pipe_handle = pn->pipe_handle;
188 ph->pep_type = PN_PEP_TYPE_COMMON;
189 ph->data[1] = type;
190 ph->data[2] = PAD;
191 ph->data[3] = PAD;
192 ph->data[4] = status;
193
194 return pn_skb_send(sk, skb, &pipe_srv);
195 }
196
197 /* Send our RX flow control information to the sender.
198 * Socket must be locked. */
199 static void pipe_grant_credits(struct sock *sk)
200 {
201 struct pep_sock *pn = pep_sk(sk);
202
203 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
204
205 switch (pn->rx_fc) {
206 case PN_LEGACY_FLOW_CONTROL: /* TODO */
207 break;
208 case PN_ONE_CREDIT_FLOW_CONTROL:
209 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
210 PEP_IND_READY, GFP_ATOMIC);
211 pn->rx_credits = 1;
212 break;
213 case PN_MULTI_CREDIT_FLOW_CONTROL:
214 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
215 break;
216 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
217 CREDITS_MAX - pn->rx_credits,
218 GFP_ATOMIC) == 0)
219 pn->rx_credits = CREDITS_MAX;
220 break;
221 }
222 }
223
224 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
225 {
226 struct pep_sock *pn = pep_sk(sk);
227 struct pnpipehdr *hdr;
228 int wake = 0;
229
230 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
231 return -EINVAL;
232
233 hdr = pnp_hdr(skb);
234 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
235 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
236 (unsigned)hdr->data[0]);
237 return -EOPNOTSUPP;
238 }
239
240 switch (hdr->data[1]) {
241 case PN_PEP_IND_FLOW_CONTROL:
242 switch (pn->tx_fc) {
243 case PN_LEGACY_FLOW_CONTROL:
244 switch (hdr->data[4]) {
245 case PEP_IND_BUSY:
246 atomic_set(&pn->tx_credits, 0);
247 break;
248 case PEP_IND_READY:
249 atomic_set(&pn->tx_credits, wake = 1);
250 break;
251 }
252 break;
253 case PN_ONE_CREDIT_FLOW_CONTROL:
254 if (hdr->data[4] == PEP_IND_READY)
255 atomic_set(&pn->tx_credits, wake = 1);
256 break;
257 }
258 break;
259
260 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
261 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
262 break;
263 atomic_add(wake = hdr->data[4], &pn->tx_credits);
264 break;
265
266 default:
267 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
268 (unsigned)hdr->data[1]);
269 return -EOPNOTSUPP;
270 }
271 if (wake)
272 sk->sk_write_space(sk);
273 return 0;
274 }
275
276 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
277 {
278 struct pep_sock *pn = pep_sk(sk);
279 struct pnpipehdr *hdr = pnp_hdr(skb);
280 u8 n_sb = hdr->data[0];
281
282 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
283 __skb_pull(skb, sizeof(*hdr));
284 while (n_sb > 0) {
285 u8 type, buf[2], len = sizeof(buf);
286 u8 *data = pep_get_sb(skb, &type, &len, buf);
287
288 if (data == NULL)
289 return -EINVAL;
290 switch (type) {
291 case PN_PIPE_SB_NEGOTIATED_FC:
292 if (len < 2 || (data[0] | data[1]) > 3)
293 break;
294 pn->tx_fc = data[0] & 3;
295 pn->rx_fc = data[1] & 3;
296 break;
297 }
298 n_sb--;
299 }
300 return 0;
301 }
302
303 /* Queue an skb to a connected sock.
304 * Socket lock must be held. */
305 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
306 {
307 struct pep_sock *pn = pep_sk(sk);
308 struct pnpipehdr *hdr = pnp_hdr(skb);
309 struct sk_buff_head *queue;
310 int err = 0;
311
312 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
313
314 switch (hdr->message_id) {
315 case PNS_PEP_CONNECT_REQ:
316 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
317 break;
318
319 case PNS_PEP_DISCONNECT_REQ:
320 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
321 sk->sk_state = TCP_CLOSE_WAIT;
322 if (!sock_flag(sk, SOCK_DEAD))
323 sk->sk_state_change(sk);
324 break;
325
326 case PNS_PEP_ENABLE_REQ:
327 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
328 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
329 break;
330
331 case PNS_PEP_RESET_REQ:
332 switch (hdr->state_after_reset) {
333 case PN_PIPE_DISABLE:
334 pn->init_enable = 0;
335 break;
336 case PN_PIPE_ENABLE:
337 pn->init_enable = 1;
338 break;
339 default: /* not allowed to send an error here!? */
340 err = -EINVAL;
341 goto out;
342 }
343 /* fall through */
344 case PNS_PEP_DISABLE_REQ:
345 atomic_set(&pn->tx_credits, 0);
346 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
347 break;
348
349 case PNS_PEP_CTRL_REQ:
350 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
351 atomic_inc(&sk->sk_drops);
352 break;
353 }
354 __skb_pull(skb, 4);
355 queue = &pn->ctrlreq_queue;
356 goto queue;
357
358 case PNS_PIPE_DATA:
359 __skb_pull(skb, 3); /* Pipe data header */
360 if (!pn_flow_safe(pn->rx_fc)) {
361 err = sock_queue_rcv_skb(sk, skb);
362 if (!err)
363 return 0;
364 break;
365 }
366
367 if (pn->rx_credits == 0) {
368 atomic_inc(&sk->sk_drops);
369 err = -ENOBUFS;
370 break;
371 }
372 pn->rx_credits--;
373 queue = &sk->sk_receive_queue;
374 goto queue;
375
376 case PNS_PEP_STATUS_IND:
377 pipe_rcv_status(sk, skb);
378 break;
379
380 case PNS_PIPE_REDIRECTED_IND:
381 err = pipe_rcv_created(sk, skb);
382 break;
383
384 case PNS_PIPE_CREATED_IND:
385 err = pipe_rcv_created(sk, skb);
386 if (err)
387 break;
388 /* fall through */
389 case PNS_PIPE_RESET_IND:
390 if (!pn->init_enable)
391 break;
392 /* fall through */
393 case PNS_PIPE_ENABLED_IND:
394 if (!pn_flow_safe(pn->tx_fc)) {
395 atomic_set(&pn->tx_credits, 1);
396 sk->sk_write_space(sk);
397 }
398 if (sk->sk_state == TCP_ESTABLISHED)
399 break; /* Nothing to do */
400 sk->sk_state = TCP_ESTABLISHED;
401 pipe_grant_credits(sk);
402 break;
403
404 case PNS_PIPE_DISABLED_IND:
405 sk->sk_state = TCP_SYN_RECV;
406 pn->rx_credits = 0;
407 break;
408
409 default:
410 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
411 hdr->message_id);
412 err = -EINVAL;
413 }
414 out:
415 kfree_skb(skb);
416 return err;
417
418 queue:
419 skb->dev = NULL;
420 skb_set_owner_r(skb, sk);
421 err = skb->len;
422 skb_queue_tail(queue, skb);
423 if (!sock_flag(sk, SOCK_DEAD))
424 sk->sk_data_ready(sk, err);
425 return 0;
426 }
427
428 /* Destroy connected sock. */
429 static void pipe_destruct(struct sock *sk)
430 {
431 struct pep_sock *pn = pep_sk(sk);
432
433 skb_queue_purge(&sk->sk_receive_queue);
434 skb_queue_purge(&pn->ctrlreq_queue);
435 }
436
437 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
438 {
439 struct sock *newsk;
440 struct pep_sock *newpn, *pn = pep_sk(sk);
441 struct pnpipehdr *hdr;
442 struct sockaddr_pn dst;
443 u16 peer_type;
444 u8 pipe_handle, enabled, n_sb;
445
446 if (!pskb_pull(skb, sizeof(*hdr) + 4))
447 return -EINVAL;
448
449 hdr = pnp_hdr(skb);
450 pipe_handle = hdr->pipe_handle;
451 switch (hdr->state_after_connect) {
452 case PN_PIPE_DISABLE:
453 enabled = 0;
454 break;
455 case PN_PIPE_ENABLE:
456 enabled = 1;
457 break;
458 default:
459 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
460 return -EINVAL;
461 }
462 peer_type = hdr->other_pep_type << 8;
463
464 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
465 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
466 return -ENOBUFS;
467 }
468
469 /* Parse sub-blocks (options) */
470 n_sb = hdr->data[4];
471 while (n_sb > 0) {
472 u8 type, buf[1], len = sizeof(buf);
473 const u8 *data = pep_get_sb(skb, &type, &len, buf);
474
475 if (data == NULL)
476 return -EINVAL;
477 switch (type) {
478 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
479 if (len < 1)
480 return -EINVAL;
481 peer_type = (peer_type & 0xff00) | data[0];
482 break;
483 }
484 n_sb--;
485 }
486
487 skb = skb_clone(skb, GFP_ATOMIC);
488 if (!skb)
489 return -ENOMEM;
490
491 /* Create a new to-be-accepted sock */
492 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
493 if (!newsk) {
494 kfree_skb(skb);
495 return -ENOMEM;
496 }
497 sock_init_data(NULL, newsk);
498 newsk->sk_state = TCP_SYN_RECV;
499 newsk->sk_backlog_rcv = pipe_do_rcv;
500 newsk->sk_protocol = sk->sk_protocol;
501 newsk->sk_destruct = pipe_destruct;
502
503 newpn = pep_sk(newsk);
504 pn_skb_get_dst_sockaddr(skb, &dst);
505 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
506 newpn->pn_sk.resource = pn->pn_sk.resource;
507 skb_queue_head_init(&newpn->ctrlreq_queue);
508 newpn->pipe_handle = pipe_handle;
509 atomic_set(&newpn->tx_credits, 0);
510 newpn->peer_type = peer_type;
511 newpn->rx_credits = 0;
512 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
513 newpn->init_enable = enabled;
514
515 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
516 skb_queue_head(&newsk->sk_receive_queue, skb);
517 if (!sock_flag(sk, SOCK_DEAD))
518 sk->sk_data_ready(sk, 0);
519
520 sk_acceptq_added(sk);
521 sk_add_node(newsk, &pn->ackq);
522 return 0;
523 }
524
525 /* Listening sock must be locked */
526 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
527 const struct sockaddr_pn *dst,
528 u8 pipe_handle)
529 {
530 struct hlist_node *node;
531 struct sock *sknode;
532 u16 dobj = pn_sockaddr_get_object(dst);
533
534 sk_for_each(sknode, node, hlist) {
535 struct pep_sock *pnnode = pep_sk(sknode);
536
537 /* Ports match, but addresses might not: */
538 if (pnnode->pn_sk.sobject != dobj)
539 continue;
540 if (pnnode->pipe_handle != pipe_handle)
541 continue;
542 if (sknode->sk_state == TCP_CLOSE_WAIT)
543 continue;
544
545 sock_hold(sknode);
546 return sknode;
547 }
548 return NULL;
549 }
550
551 /*
552 * Deliver an skb to a listening sock.
553 * Socket lock must be held.
554 * We then queue the skb to the right connected sock (if any).
555 */
556 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
557 {
558 struct pep_sock *pn = pep_sk(sk);
559 struct sock *sknode;
560 struct pnpipehdr *hdr;
561 struct sockaddr_pn dst;
562 int err = NET_RX_SUCCESS;
563 u8 pipe_handle;
564
565 if (!pskb_may_pull(skb, sizeof(*hdr)))
566 goto drop;
567
568 hdr = pnp_hdr(skb);
569 pipe_handle = hdr->pipe_handle;
570 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
571 goto drop;
572
573 pn_skb_get_dst_sockaddr(skb, &dst);
574
575 /* Look for an existing pipe handle */
576 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
577 if (sknode)
578 return sk_receive_skb(sknode, skb, 1);
579
580 /* Look for a pipe handle pending accept */
581 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
582 if (sknode) {
583 sock_put(sknode);
584 if (net_ratelimit())
585 printk(KERN_WARNING"Phonet unconnected PEP ignored");
586 err = NET_RX_DROP;
587 goto drop;
588 }
589
590 switch (hdr->message_id) {
591 case PNS_PEP_CONNECT_REQ:
592 err = pep_connreq_rcv(sk, skb);
593 break;
594
595 case PNS_PEP_DISCONNECT_REQ:
596 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
597 break;
598
599 case PNS_PEP_CTRL_REQ:
600 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
601 break;
602
603 case PNS_PEP_RESET_REQ:
604 case PNS_PEP_ENABLE_REQ:
605 case PNS_PEP_DISABLE_REQ:
606 /* invalid handle is not even allowed here! */
607 default:
608 err = NET_RX_DROP;
609 }
610 drop:
611 kfree_skb(skb);
612 return err;
613 }
614
615 /* associated socket ceases to exist */
616 static void pep_sock_close(struct sock *sk, long timeout)
617 {
618 struct pep_sock *pn = pep_sk(sk);
619 int ifindex = 0;
620
621 sk_common_release(sk);
622
623 lock_sock(sk);
624 if (sk->sk_state == TCP_LISTEN) {
625 /* Destroy the listen queue */
626 struct sock *sknode;
627 struct hlist_node *p, *n;
628
629 sk_for_each_safe(sknode, p, n, &pn->ackq)
630 sk_del_node_init(sknode);
631 sk->sk_state = TCP_CLOSE;
632 }
633 ifindex = pn->ifindex;
634 pn->ifindex = 0;
635 release_sock(sk);
636
637 if (ifindex)
638 gprs_detach(sk);
639 }
640
641 static int pep_wait_connreq(struct sock *sk, int noblock)
642 {
643 struct task_struct *tsk = current;
644 struct pep_sock *pn = pep_sk(sk);
645 long timeo = sock_rcvtimeo(sk, noblock);
646
647 for (;;) {
648 DEFINE_WAIT(wait);
649
650 if (sk->sk_state != TCP_LISTEN)
651 return -EINVAL;
652 if (!hlist_empty(&pn->ackq))
653 break;
654 if (!timeo)
655 return -EWOULDBLOCK;
656 if (signal_pending(tsk))
657 return sock_intr_errno(timeo);
658
659 prepare_to_wait_exclusive(&sk->sk_socket->wait, &wait,
660 TASK_INTERRUPTIBLE);
661 release_sock(sk);
662 timeo = schedule_timeout(timeo);
663 lock_sock(sk);
664 finish_wait(&sk->sk_socket->wait, &wait);
665 }
666
667 return 0;
668 }
669
670 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
671 {
672 struct pep_sock *pn = pep_sk(sk);
673 struct sock *newsk = NULL;
674 struct sk_buff *oskb;
675 int err;
676
677 lock_sock(sk);
678 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
679 if (err)
680 goto out;
681
682 newsk = __sk_head(&pn->ackq);
683
684 oskb = skb_dequeue(&newsk->sk_receive_queue);
685 err = pep_accept_conn(newsk, oskb);
686 if (err) {
687 skb_queue_head(&newsk->sk_receive_queue, oskb);
688 newsk = NULL;
689 goto out;
690 }
691
692 sock_hold(sk);
693 pep_sk(newsk)->listener = sk;
694
695 sock_hold(newsk);
696 sk_del_node_init(newsk);
697 sk_acceptq_removed(sk);
698 sk_add_node(newsk, &pn->hlist);
699 __sock_put(newsk);
700
701 out:
702 release_sock(sk);
703 *errp = err;
704 return newsk;
705 }
706
707 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
708 {
709 struct pep_sock *pn = pep_sk(sk);
710 int answ;
711
712 switch (cmd) {
713 case SIOCINQ:
714 if (sk->sk_state == TCP_LISTEN)
715 return -EINVAL;
716
717 lock_sock(sk);
718 if (sock_flag(sk, SOCK_URGINLINE) &&
719 !skb_queue_empty(&pn->ctrlreq_queue))
720 answ = skb_peek(&pn->ctrlreq_queue)->len;
721 else if (!skb_queue_empty(&sk->sk_receive_queue))
722 answ = skb_peek(&sk->sk_receive_queue)->len;
723 else
724 answ = 0;
725 release_sock(sk);
726 return put_user(answ, (int __user *)arg);
727 }
728
729 return -ENOIOCTLCMD;
730 }
731
732 static int pep_init(struct sock *sk)
733 {
734 struct pep_sock *pn = pep_sk(sk);
735
736 INIT_HLIST_HEAD(&pn->ackq);
737 INIT_HLIST_HEAD(&pn->hlist);
738 skb_queue_head_init(&pn->ctrlreq_queue);
739 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
740 return 0;
741 }
742
743 static int pep_setsockopt(struct sock *sk, int level, int optname,
744 char __user *optval, unsigned int optlen)
745 {
746 struct pep_sock *pn = pep_sk(sk);
747 int val = 0, err = 0;
748
749 if (level != SOL_PNPIPE)
750 return -ENOPROTOOPT;
751 if (optlen >= sizeof(int)) {
752 if (get_user(val, (int __user *) optval))
753 return -EFAULT;
754 }
755
756 lock_sock(sk);
757 switch (optname) {
758 case PNPIPE_ENCAP:
759 if (val && val != PNPIPE_ENCAP_IP) {
760 err = -EINVAL;
761 break;
762 }
763 if (!pn->ifindex == !val)
764 break; /* Nothing to do! */
765 if (!capable(CAP_NET_ADMIN)) {
766 err = -EPERM;
767 break;
768 }
769 if (val) {
770 release_sock(sk);
771 err = gprs_attach(sk);
772 if (err > 0) {
773 pn->ifindex = err;
774 err = 0;
775 }
776 } else {
777 pn->ifindex = 0;
778 release_sock(sk);
779 gprs_detach(sk);
780 err = 0;
781 }
782 goto out_norel;
783 default:
784 err = -ENOPROTOOPT;
785 }
786 release_sock(sk);
787
788 out_norel:
789 return err;
790 }
791
792 static int pep_getsockopt(struct sock *sk, int level, int optname,
793 char __user *optval, int __user *optlen)
794 {
795 struct pep_sock *pn = pep_sk(sk);
796 int len, val;
797
798 if (level != SOL_PNPIPE)
799 return -ENOPROTOOPT;
800 if (get_user(len, optlen))
801 return -EFAULT;
802
803 switch (optname) {
804 case PNPIPE_ENCAP:
805 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
806 break;
807 case PNPIPE_IFINDEX:
808 val = pn->ifindex;
809 break;
810 default:
811 return -ENOPROTOOPT;
812 }
813
814 len = min_t(unsigned int, sizeof(int), len);
815 if (put_user(len, optlen))
816 return -EFAULT;
817 if (put_user(val, (int __user *) optval))
818 return -EFAULT;
819 return 0;
820 }
821
822 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
823 {
824 struct pep_sock *pn = pep_sk(sk);
825 struct pnpipehdr *ph;
826
827 if (pn_flow_safe(pn->tx_fc) &&
828 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
829 kfree_skb(skb);
830 return -ENOBUFS;
831 }
832
833 skb_push(skb, 3);
834 skb_reset_transport_header(skb);
835 ph = pnp_hdr(skb);
836 ph->utid = 0;
837 ph->message_id = PNS_PIPE_DATA;
838 ph->pipe_handle = pn->pipe_handle;
839
840 return pn_skb_send(sk, skb, &pipe_srv);
841 }
842
843 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
844 struct msghdr *msg, size_t len)
845 {
846 struct pep_sock *pn = pep_sk(sk);
847 struct sk_buff *skb;
848 long timeo;
849 int flags = msg->msg_flags;
850 int err, done;
851
852 if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
853 return -EOPNOTSUPP;
854
855 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
856 flags & MSG_DONTWAIT, &err);
857 if (!skb)
858 return -ENOBUFS;
859
860 skb_reserve(skb, MAX_PHONET_HEADER + 3);
861 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
862 if (err < 0)
863 goto outfree;
864
865 lock_sock(sk);
866 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
867 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
868 err = -ENOTCONN;
869 goto out;
870 }
871 if (sk->sk_state != TCP_ESTABLISHED) {
872 /* Wait until the pipe gets to enabled state */
873 disabled:
874 err = sk_stream_wait_connect(sk, &timeo);
875 if (err)
876 goto out;
877
878 if (sk->sk_state == TCP_CLOSE_WAIT) {
879 err = -ECONNRESET;
880 goto out;
881 }
882 }
883 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
884
885 /* Wait until flow control allows TX */
886 done = atomic_read(&pn->tx_credits);
887 while (!done) {
888 DEFINE_WAIT(wait);
889
890 if (!timeo) {
891 err = -EAGAIN;
892 goto out;
893 }
894 if (signal_pending(current)) {
895 err = sock_intr_errno(timeo);
896 goto out;
897 }
898
899 prepare_to_wait(&sk->sk_socket->wait, &wait,
900 TASK_INTERRUPTIBLE);
901 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
902 finish_wait(&sk->sk_socket->wait, &wait);
903
904 if (sk->sk_state != TCP_ESTABLISHED)
905 goto disabled;
906 }
907
908 err = pipe_skb_send(sk, skb);
909 if (err >= 0)
910 err = len; /* success! */
911 skb = NULL;
912 out:
913 release_sock(sk);
914 outfree:
915 kfree_skb(skb);
916 return err;
917 }
918
919 int pep_writeable(struct sock *sk)
920 {
921 struct pep_sock *pn = pep_sk(sk);
922
923 return atomic_read(&pn->tx_credits);
924 }
925
926 int pep_write(struct sock *sk, struct sk_buff *skb)
927 {
928 struct sk_buff *rskb, *fs;
929 int flen = 0;
930
931 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
932 if (!rskb) {
933 kfree_skb(skb);
934 return -ENOMEM;
935 }
936 skb_shinfo(rskb)->frag_list = skb;
937 rskb->len += skb->len;
938 rskb->data_len += rskb->len;
939 rskb->truesize += rskb->len;
940
941 /* Avoid nested fragments */
942 skb_walk_frags(skb, fs)
943 flen += fs->len;
944 skb->next = skb_shinfo(skb)->frag_list;
945 skb_frag_list_init(skb);
946 skb->len -= flen;
947 skb->data_len -= flen;
948 skb->truesize -= flen;
949
950 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
951 return pipe_skb_send(sk, rskb);
952 }
953
954 struct sk_buff *pep_read(struct sock *sk)
955 {
956 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
957
958 if (sk->sk_state == TCP_ESTABLISHED)
959 pipe_grant_credits(sk);
960 return skb;
961 }
962
963 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
964 struct msghdr *msg, size_t len, int noblock,
965 int flags, int *addr_len)
966 {
967 struct sk_buff *skb;
968 int err;
969
970 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
971 return -ENOTCONN;
972
973 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
974 /* Dequeue and acknowledge control request */
975 struct pep_sock *pn = pep_sk(sk);
976
977 skb = skb_dequeue(&pn->ctrlreq_queue);
978 if (skb) {
979 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
980 GFP_KERNEL);
981 msg->msg_flags |= MSG_OOB;
982 goto copy;
983 }
984 if (flags & MSG_OOB)
985 return -EINVAL;
986 }
987
988 skb = skb_recv_datagram(sk, flags, noblock, &err);
989 lock_sock(sk);
990 if (skb == NULL) {
991 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
992 err = -ECONNRESET;
993 release_sock(sk);
994 return err;
995 }
996
997 if (sk->sk_state == TCP_ESTABLISHED)
998 pipe_grant_credits(sk);
999 release_sock(sk);
1000 copy:
1001 msg->msg_flags |= MSG_EOR;
1002 if (skb->len > len)
1003 msg->msg_flags |= MSG_TRUNC;
1004 else
1005 len = skb->len;
1006
1007 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1008 if (!err)
1009 err = (flags & MSG_TRUNC) ? skb->len : len;
1010
1011 skb_free_datagram(sk, skb);
1012 return err;
1013 }
1014
1015 static void pep_sock_unhash(struct sock *sk)
1016 {
1017 struct pep_sock *pn = pep_sk(sk);
1018 struct sock *skparent = NULL;
1019
1020 lock_sock(sk);
1021 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1022 skparent = pn->listener;
1023 sk_del_node_init(sk);
1024 release_sock(sk);
1025
1026 sk = skparent;
1027 pn = pep_sk(skparent);
1028 lock_sock(sk);
1029 }
1030 /* Unhash a listening sock only when it is closed
1031 * and all of its active connected pipes are closed. */
1032 if (hlist_empty(&pn->hlist))
1033 pn_sock_unhash(&pn->pn_sk.sk);
1034 release_sock(sk);
1035
1036 if (skparent)
1037 sock_put(skparent);
1038 }
1039
1040 static struct proto pep_proto = {
1041 .close = pep_sock_close,
1042 .accept = pep_sock_accept,
1043 .ioctl = pep_ioctl,
1044 .init = pep_init,
1045 .setsockopt = pep_setsockopt,
1046 .getsockopt = pep_getsockopt,
1047 .sendmsg = pep_sendmsg,
1048 .recvmsg = pep_recvmsg,
1049 .backlog_rcv = pep_do_rcv,
1050 .hash = pn_sock_hash,
1051 .unhash = pep_sock_unhash,
1052 .get_port = pn_sock_get_port,
1053 .obj_size = sizeof(struct pep_sock),
1054 .owner = THIS_MODULE,
1055 .name = "PNPIPE",
1056 };
1057
1058 static struct phonet_protocol pep_pn_proto = {
1059 .ops = &phonet_stream_ops,
1060 .prot = &pep_proto,
1061 .sock_type = SOCK_SEQPACKET,
1062 };
1063
1064 static int __init pep_register(void)
1065 {
1066 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1067 }
1068
1069 static void __exit pep_unregister(void)
1070 {
1071 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1072 }
1073
1074 module_init(pep_register);
1075 module_exit(pep_unregister);
1076 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1077 MODULE_DESCRIPTION("Phonet pipe protocol");
1078 MODULE_LICENSE("GPL");
1079 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree