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Revert "MUSB: Remove usb_musb_pm_init() call"
[linux-ginger.git] / net / phonet / pep.c
blob5f32d217535b4695667dc3e75ea3e0bcaab9a15e
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 = pnp_hdr(skb);
228 int wake = 0;
229
230 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
231 return -EINVAL;
232
233 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
234 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
235 (unsigned)hdr->data[0]);
236 return -EOPNOTSUPP;
237 }
238
239 switch (hdr->data[1]) {
240 case PN_PEP_IND_FLOW_CONTROL:
241 switch (pn->tx_fc) {
242 case PN_LEGACY_FLOW_CONTROL:
243 switch (hdr->data[4]) {
244 case PEP_IND_BUSY:
245 atomic_set(&pn->tx_credits, 0);
246 break;
247 case PEP_IND_READY:
248 atomic_set(&pn->tx_credits, wake = 1);
249 break;
250 }
251 break;
252 case PN_ONE_CREDIT_FLOW_CONTROL:
253 if (hdr->data[4] == PEP_IND_READY)
254 atomic_set(&pn->tx_credits, wake = 1);
255 break;
256 }
257 break;
258
259 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
260 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
261 break;
262 atomic_add(wake = hdr->data[4], &pn->tx_credits);
263 break;
264
265 default:
266 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
267 (unsigned)hdr->data[1]);
268 return -EOPNOTSUPP;
269 }
270 if (wake)
271 sk->sk_write_space(sk);
272 return 0;
273 }
274
275 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
276 {
277 struct pep_sock *pn = pep_sk(sk);
278 struct pnpipehdr *hdr = pnp_hdr(skb);
279 u8 n_sb = hdr->data[0];
280
281 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
282 __skb_pull(skb, sizeof(*hdr));
283 while (n_sb > 0) {
284 u8 type, buf[2], len = sizeof(buf);
285 u8 *data = pep_get_sb(skb, &type, &len, buf);
286
287 if (data == NULL)
288 return -EINVAL;
289 switch (type) {
290 case PN_PIPE_SB_NEGOTIATED_FC:
291 if (len < 2 || (data[0] | data[1]) > 3)
292 break;
293 pn->tx_fc = data[0] & 3;
294 pn->rx_fc = data[1] & 3;
295 break;
296 }
297 n_sb--;
298 }
299 return 0;
300 }
301
302 /* Queue an skb to a connected sock.
303 * Socket lock must be held. */
304 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
305 {
306 struct pep_sock *pn = pep_sk(sk);
307 struct pnpipehdr *hdr = pnp_hdr(skb);
308 struct sk_buff_head *queue;
309 int err = 0;
310
311 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
312
313 switch (hdr->message_id) {
314 case PNS_PEP_CONNECT_REQ:
315 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
316 break;
317
318 case PNS_PEP_DISCONNECT_REQ:
319 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
320 sk->sk_state = TCP_CLOSE_WAIT;
321 if (!sock_flag(sk, SOCK_DEAD))
322 sk->sk_state_change(sk);
323 break;
324
325 case PNS_PEP_ENABLE_REQ:
326 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
327 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
328 break;
329
330 case PNS_PEP_RESET_REQ:
331 switch (hdr->state_after_reset) {
332 case PN_PIPE_DISABLE:
333 pn->init_enable = 0;
334 break;
335 case PN_PIPE_ENABLE:
336 pn->init_enable = 1;
337 break;
338 default: /* not allowed to send an error here!? */
339 err = -EINVAL;
340 goto out;
341 }
342 /* fall through */
343 case PNS_PEP_DISABLE_REQ:
344 atomic_set(&pn->tx_credits, 0);
345 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
346 break;
347
348 case PNS_PEP_CTRL_REQ:
349 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
350 atomic_inc(&sk->sk_drops);
351 break;
352 }
353 __skb_pull(skb, 4);
354 queue = &pn->ctrlreq_queue;
355 goto queue;
356
357 case PNS_PIPE_DATA:
358 __skb_pull(skb, 3); /* Pipe data header */
359 if (!pn_flow_safe(pn->rx_fc)) {
360 err = sock_queue_rcv_skb(sk, skb);
361 if (!err)
362 return 0;
363 if (err == -ENOMEM)
364 atomic_inc(&sk->sk_drops);
365 break;
366 }
367
368 if (pn->rx_credits == 0) {
369 atomic_inc(&sk->sk_drops);
370 err = -ENOBUFS;
371 break;
372 }
373 pn->rx_credits--;
374 queue = &sk->sk_receive_queue;
375 goto queue;
376
377 case PNS_PEP_STATUS_IND:
378 pipe_rcv_status(sk, skb);
379 break;
380
381 case PNS_PIPE_REDIRECTED_IND:
382 err = pipe_rcv_created(sk, skb);
383 break;
384
385 case PNS_PIPE_CREATED_IND:
386 err = pipe_rcv_created(sk, skb);
387 if (err)
388 break;
389 /* fall through */
390 case PNS_PIPE_RESET_IND:
391 if (!pn->init_enable)
392 break;
393 /* fall through */
394 case PNS_PIPE_ENABLED_IND:
395 if (!pn_flow_safe(pn->tx_fc)) {
396 atomic_set(&pn->tx_credits, 1);
397 sk->sk_write_space(sk);
398 }
399 if (sk->sk_state == TCP_ESTABLISHED)
400 break; /* Nothing to do */
401 sk->sk_state = TCP_ESTABLISHED;
402 pipe_grant_credits(sk);
403 break;
404
405 case PNS_PIPE_DISABLED_IND:
406 sk->sk_state = TCP_SYN_RECV;
407 pn->rx_credits = 0;
408 break;
409
410 default:
411 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
412 hdr->message_id);
413 err = -EINVAL;
414 }
415 out:
416 kfree_skb(skb);
417 return err;
418
419 queue:
420 skb->dev = NULL;
421 skb_set_owner_r(skb, sk);
422 err = skb->len;
423 skb_queue_tail(queue, skb);
424 if (!sock_flag(sk, SOCK_DEAD))
425 sk->sk_data_ready(sk, err);
426 return 0;
427 }
428
429 /* Destroy connected sock. */
430 static void pipe_destruct(struct sock *sk)
431 {
432 struct pep_sock *pn = pep_sk(sk);
433
434 skb_queue_purge(&sk->sk_receive_queue);
435 skb_queue_purge(&pn->ctrlreq_queue);
436 }
437
438 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
439 {
440 struct sock *newsk;
441 struct pep_sock *newpn, *pn = pep_sk(sk);
442 struct pnpipehdr *hdr;
443 struct sockaddr_pn dst;
444 u16 peer_type;
445 u8 pipe_handle, enabled, n_sb;
446
447 if (!pskb_pull(skb, sizeof(*hdr) + 4))
448 return -EINVAL;
449
450 hdr = pnp_hdr(skb);
451 pipe_handle = hdr->pipe_handle;
452 switch (hdr->state_after_connect) {
453 case PN_PIPE_DISABLE:
454 enabled = 0;
455 break;
456 case PN_PIPE_ENABLE:
457 enabled = 1;
458 break;
459 default:
460 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
461 return -EINVAL;
462 }
463 peer_type = hdr->other_pep_type << 8;
464
465 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
466 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
467 return -ENOBUFS;
468 }
469
470 /* Parse sub-blocks (options) */
471 n_sb = hdr->data[4];
472 while (n_sb > 0) {
473 u8 type, buf[1], len = sizeof(buf);
474 const u8 *data = pep_get_sb(skb, &type, &len, buf);
475
476 if (data == NULL)
477 return -EINVAL;
478 switch (type) {
479 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
480 if (len < 1)
481 return -EINVAL;
482 peer_type = (peer_type & 0xff00) | data[0];
483 break;
484 }
485 n_sb--;
486 }
487
488 skb = skb_clone(skb, GFP_ATOMIC);
489 if (!skb)
490 return -ENOMEM;
491
492 /* Create a new to-be-accepted sock */
493 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
494 if (!newsk) {
495 kfree_skb(skb);
496 return -ENOMEM;
497 }
498 sock_init_data(NULL, newsk);
499 newsk->sk_state = TCP_SYN_RECV;
500 newsk->sk_backlog_rcv = pipe_do_rcv;
501 newsk->sk_protocol = sk->sk_protocol;
502 newsk->sk_destruct = pipe_destruct;
503
504 newpn = pep_sk(newsk);
505 pn_skb_get_dst_sockaddr(skb, &dst);
506 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
507 newpn->pn_sk.resource = pn->pn_sk.resource;
508 skb_queue_head_init(&newpn->ctrlreq_queue);
509 newpn->pipe_handle = pipe_handle;
510 atomic_set(&newpn->tx_credits, 0);
511 newpn->peer_type = peer_type;
512 newpn->rx_credits = 0;
513 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
514 newpn->init_enable = enabled;
515
516 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
517 skb_queue_head(&newsk->sk_receive_queue, skb);
518 if (!sock_flag(sk, SOCK_DEAD))
519 sk->sk_data_ready(sk, 0);
520
521 sk_acceptq_added(sk);
522 sk_add_node(newsk, &pn->ackq);
523 return 0;
524 }
525
526 /* Listening sock must be locked */
527 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
528 const struct sockaddr_pn *dst,
529 u8 pipe_handle)
530 {
531 struct hlist_node *node;
532 struct sock *sknode;
533 u16 dobj = pn_sockaddr_get_object(dst);
534
535 sk_for_each(sknode, node, hlist) {
536 struct pep_sock *pnnode = pep_sk(sknode);
537
538 /* Ports match, but addresses might not: */
539 if (pnnode->pn_sk.sobject != dobj)
540 continue;
541 if (pnnode->pipe_handle != pipe_handle)
542 continue;
543 if (sknode->sk_state == TCP_CLOSE_WAIT)
544 continue;
545
546 sock_hold(sknode);
547 return sknode;
548 }
549 return NULL;
550 }
551
552 /*
553 * Deliver an skb to a listening sock.
554 * Socket lock must be held.
555 * We then queue the skb to the right connected sock (if any).
556 */
557 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
558 {
559 struct pep_sock *pn = pep_sk(sk);
560 struct sock *sknode;
561 struct pnpipehdr *hdr;
562 struct sockaddr_pn dst;
563 int err = NET_RX_SUCCESS;
564 u8 pipe_handle;
565
566 if (!pskb_may_pull(skb, sizeof(*hdr)))
567 goto drop;
568
569 hdr = pnp_hdr(skb);
570 pipe_handle = hdr->pipe_handle;
571 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
572 goto drop;
573
574 pn_skb_get_dst_sockaddr(skb, &dst);
575
576 /* Look for an existing pipe handle */
577 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
578 if (sknode)
579 return sk_receive_skb(sknode, skb, 1);
580
581 /* Look for a pipe handle pending accept */
582 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
583 if (sknode) {
584 sock_put(sknode);
585 if (net_ratelimit())
586 printk(KERN_WARNING"Phonet unconnected PEP ignored");
587 err = NET_RX_DROP;
588 goto drop;
589 }
590
591 switch (hdr->message_id) {
592 case PNS_PEP_CONNECT_REQ:
593 err = pep_connreq_rcv(sk, skb);
594 break;
595
596 case PNS_PEP_DISCONNECT_REQ:
597 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
598 break;
599
600 case PNS_PEP_CTRL_REQ:
601 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
602 break;
603
604 case PNS_PEP_RESET_REQ:
605 case PNS_PEP_ENABLE_REQ:
606 case PNS_PEP_DISABLE_REQ:
607 /* invalid handle is not even allowed here! */
608 default:
609 err = NET_RX_DROP;
610 }
611 drop:
612 kfree_skb(skb);
613 return err;
614 }
615
616 /* associated socket ceases to exist */
617 static void pep_sock_close(struct sock *sk, long timeout)
618 {
619 struct pep_sock *pn = pep_sk(sk);
620 int ifindex = 0;
621
622 sk_common_release(sk);
623
624 lock_sock(sk);
625 if (sk->sk_state == TCP_LISTEN) {
626 /* Destroy the listen queue */
627 struct sock *sknode;
628 struct hlist_node *p, *n;
629
630 sk_for_each_safe(sknode, p, n, &pn->ackq)
631 sk_del_node_init(sknode);
632 sk->sk_state = TCP_CLOSE;
633 }
634 ifindex = pn->ifindex;
635 pn->ifindex = 0;
636 release_sock(sk);
637
638 if (ifindex)
639 gprs_detach(sk);
640 }
641
642 static int pep_wait_connreq(struct sock *sk, int noblock)
643 {
644 struct task_struct *tsk = current;
645 struct pep_sock *pn = pep_sk(sk);
646 long timeo = sock_rcvtimeo(sk, noblock);
647
648 for (;;) {
649 DEFINE_WAIT(wait);
650
651 if (sk->sk_state != TCP_LISTEN)
652 return -EINVAL;
653 if (!hlist_empty(&pn->ackq))
654 break;
655 if (!timeo)
656 return -EWOULDBLOCK;
657 if (signal_pending(tsk))
658 return sock_intr_errno(timeo);
659
660 prepare_to_wait_exclusive(&sk->sk_socket->wait, &wait,
661 TASK_INTERRUPTIBLE);
662 release_sock(sk);
663 timeo = schedule_timeout(timeo);
664 lock_sock(sk);
665 finish_wait(&sk->sk_socket->wait, &wait);
666 }
667
668 return 0;
669 }
670
671 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
672 {
673 struct pep_sock *pn = pep_sk(sk);
674 struct sock *newsk = NULL;
675 struct sk_buff *oskb;
676 int err;
677
678 lock_sock(sk);
679 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
680 if (err)
681 goto out;
682
683 newsk = __sk_head(&pn->ackq);
684
685 oskb = skb_dequeue(&newsk->sk_receive_queue);
686 err = pep_accept_conn(newsk, oskb);
687 if (err) {
688 skb_queue_head(&newsk->sk_receive_queue, oskb);
689 newsk = NULL;
690 goto out;
691 }
692
693 sock_hold(sk);
694 pep_sk(newsk)->listener = sk;
695
696 sock_hold(newsk);
697 sk_del_node_init(newsk);
698 sk_acceptq_removed(sk);
699 sk_add_node(newsk, &pn->hlist);
700 __sock_put(newsk);
701
702 out:
703 release_sock(sk);
704 *errp = err;
705 return newsk;
706 }
707
708 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
709 {
710 struct pep_sock *pn = pep_sk(sk);
711 int answ;
712
713 switch (cmd) {
714 case SIOCINQ:
715 if (sk->sk_state == TCP_LISTEN)
716 return -EINVAL;
717
718 lock_sock(sk);
719 if (sock_flag(sk, SOCK_URGINLINE)
720 && !skb_queue_empty(&pn->ctrlreq_queue))
721 answ = skb_peek(&pn->ctrlreq_queue)->len;
722 else if (!skb_queue_empty(&sk->sk_receive_queue))
723 answ = skb_peek(&sk->sk_receive_queue)->len;
724 else
725 answ = 0;
726 release_sock(sk);
727 return put_user(answ, (int __user *)arg);
728 }
729
730 return -ENOIOCTLCMD;
731 }
732
733 static int pep_init(struct sock *sk)
734 {
735 struct pep_sock *pn = pep_sk(sk);
736
737 INIT_HLIST_HEAD(&pn->ackq);
738 INIT_HLIST_HEAD(&pn->hlist);
739 skb_queue_head_init(&pn->ctrlreq_queue);
740 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
741 return 0;
742 }
743
744 static int pep_setsockopt(struct sock *sk, int level, int optname,
745 char __user *optval, unsigned int optlen)
746 {
747 struct pep_sock *pn = pep_sk(sk);
748 int val = 0, err = 0;
749
750 if (level != SOL_PNPIPE)
751 return -ENOPROTOOPT;
752 if (optlen >= sizeof(int)) {
753 if (get_user(val, (int __user *) optval))
754 return -EFAULT;
755 }
756
757 lock_sock(sk);
758 switch (optname) {
759 case PNPIPE_ENCAP:
760 if (val && val != PNPIPE_ENCAP_IP) {
761 err = -EINVAL;
762 break;
763 }
764 if (!pn->ifindex == !val)
765 break; /* Nothing to do! */
766 if (!capable(CAP_NET_ADMIN)) {
767 err = -EPERM;
768 break;
769 }
770 if (val) {
771 release_sock(sk);
772 err = gprs_attach(sk);
773 if (err > 0) {
774 pn->ifindex = err;
775 err = 0;
776 }
777 } else {
778 pn->ifindex = 0;
779 release_sock(sk);
780 gprs_detach(sk);
781 err = 0;
782 }
783 goto out_norel;
784 default:
785 err = -ENOPROTOOPT;
786 }
787 release_sock(sk);
788
789 out_norel:
790 return err;
791 }
792
793 static int pep_getsockopt(struct sock *sk, int level, int optname,
794 char __user *optval, int __user *optlen)
795 {
796 struct pep_sock *pn = pep_sk(sk);
797 int len, val;
798
799 if (level != SOL_PNPIPE)
800 return -ENOPROTOOPT;
801 if (get_user(len, optlen))
802 return -EFAULT;
803
804 switch (optname) {
805 case PNPIPE_ENCAP:
806 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
807 break;
808 case PNPIPE_IFINDEX:
809 val = pn->ifindex;
810 break;
811 default:
812 return -ENOPROTOOPT;
813 }
814
815 len = min_t(unsigned int, sizeof(int), len);
816 if (put_user(len, optlen))
817 return -EFAULT;
818 if (put_user(val, (int __user *) optval))
819 return -EFAULT;
820 return 0;
821 }
822
823 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
824 {
825 struct pep_sock *pn = pep_sk(sk);
826 struct pnpipehdr *ph;
827
828 if (pn_flow_safe(pn->tx_fc) &&
829 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
830 kfree_skb(skb);
831 return -ENOBUFS;
832 }
833
834 skb_push(skb, 3);
835 skb_reset_transport_header(skb);
836 ph = pnp_hdr(skb);
837 ph->utid = 0;
838 ph->message_id = PNS_PIPE_DATA;
839 ph->pipe_handle = pn->pipe_handle;
840
841 return pn_skb_send(sk, skb, &pipe_srv);
842 }
843
844 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
845 struct msghdr *msg, size_t len)
846 {
847 struct pep_sock *pn = pep_sk(sk);
848 struct sk_buff *skb = NULL;
849 long timeo;
850 int flags = msg->msg_flags;
851 int err, done;
852
853 if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
854 return -EOPNOTSUPP;
855
856 lock_sock(sk);
857 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
858 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
859 err = -ENOTCONN;
860 goto out;
861 }
862 if (sk->sk_state != TCP_ESTABLISHED) {
863 /* Wait until the pipe gets to enabled state */
864 disabled:
865 err = sk_stream_wait_connect(sk, &timeo);
866 if (err)
867 goto out;
868
869 if (sk->sk_state == TCP_CLOSE_WAIT) {
870 err = -ECONNRESET;
871 goto out;
872 }
873 }
874 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
875
876 /* Wait until flow control allows TX */
877 done = atomic_read(&pn->tx_credits);
878 while (!done) {
879 DEFINE_WAIT(wait);
880
881 if (!timeo) {
882 err = -EAGAIN;
883 goto out;
884 }
885 if (signal_pending(current)) {
886 err = sock_intr_errno(timeo);
887 goto out;
888 }
889
890 prepare_to_wait(&sk->sk_socket->wait, &wait,
891 TASK_INTERRUPTIBLE);
892 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
893 finish_wait(&sk->sk_socket->wait, &wait);
894
895 if (sk->sk_state != TCP_ESTABLISHED)
896 goto disabled;
897 }
898
899 if (!skb) {
900 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
901 flags & MSG_DONTWAIT, &err);
902 if (skb == NULL)
903 goto out;
904 skb_reserve(skb, MAX_PHONET_HEADER + 3);
905
906 if (sk->sk_state != TCP_ESTABLISHED ||
907 !atomic_read(&pn->tx_credits))
908 goto disabled; /* sock_alloc_send_skb might sleep */
909 }
910
911 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
912 if (err < 0)
913 goto out;
914
915 err = pipe_skb_send(sk, skb);
916 if (err >= 0)
917 err = len; /* success! */
918 skb = NULL;
919 out:
920 release_sock(sk);
921 kfree_skb(skb);
922 return err;
923 }
924
925 int pep_writeable(struct sock *sk)
926 {
927 struct pep_sock *pn = pep_sk(sk);
928
929 return atomic_read(&pn->tx_credits);
930 }
931
932 int pep_write(struct sock *sk, struct sk_buff *skb)
933 {
934 struct sk_buff *rskb, *fs;
935 int flen = 0;
936
937 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
938 if (!rskb) {
939 kfree_skb(skb);
940 return -ENOMEM;
941 }
942 skb_shinfo(rskb)->frag_list = skb;
943 rskb->len += skb->len;
944 rskb->data_len += rskb->len;
945 rskb->truesize += rskb->len;
946
947 /* Avoid nested fragments */
948 skb_walk_frags(skb, fs)
949 flen += fs->len;
950 skb->next = skb_shinfo(skb)->frag_list;
951 skb_frag_list_init(skb);
952 skb->len -= flen;
953 skb->data_len -= flen;
954 skb->truesize -= flen;
955
956 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
957 return pipe_skb_send(sk, rskb);
958 }
959
960 struct sk_buff *pep_read(struct sock *sk)
961 {
962 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
963
964 if (sk->sk_state == TCP_ESTABLISHED)
965 pipe_grant_credits(sk);
966 return skb;
967 }
968
969 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
970 struct msghdr *msg, size_t len, int noblock,
971 int flags, int *addr_len)
972 {
973 struct sk_buff *skb;
974 int err;
975
976 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
977 return -ENOTCONN;
978
979 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
980 /* Dequeue and acknowledge control request */
981 struct pep_sock *pn = pep_sk(sk);
982
983 skb = skb_dequeue(&pn->ctrlreq_queue);
984 if (skb) {
985 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
986 GFP_KERNEL);
987 msg->msg_flags |= MSG_OOB;
988 goto copy;
989 }
990 if (flags & MSG_OOB)
991 return -EINVAL;
992 }
993
994 skb = skb_recv_datagram(sk, flags, noblock, &err);
995 lock_sock(sk);
996 if (skb == NULL) {
997 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
998 err = -ECONNRESET;
999 release_sock(sk);
1000 return err;
1001 }
1002
1003 if (sk->sk_state == TCP_ESTABLISHED)
1004 pipe_grant_credits(sk);
1005 release_sock(sk);
1006 copy:
1007 msg->msg_flags |= MSG_EOR;
1008 if (skb->len > len)
1009 msg->msg_flags |= MSG_TRUNC;
1010 else
1011 len = skb->len;
1012
1013 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1014 if (!err)
1015 err = (flags & MSG_TRUNC) ? skb->len : len;
1016
1017 skb_free_datagram(sk, skb);
1018 return err;
1019 }
1020
1021 static void pep_sock_unhash(struct sock *sk)
1022 {
1023 struct pep_sock *pn = pep_sk(sk);
1024 struct sock *skparent = NULL;
1025
1026 lock_sock(sk);
1027 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1028 skparent = pn->listener;
1029 sk_del_node_init(sk);
1030 release_sock(sk);
1031
1032 sk = skparent;
1033 pn = pep_sk(skparent);
1034 lock_sock(sk);
1035 }
1036 /* Unhash a listening sock only when it is closed
1037 * and all of its active connected pipes are closed. */
1038 if (hlist_empty(&pn->hlist))
1039 pn_sock_unhash(&pn->pn_sk.sk);
1040 release_sock(sk);
1041
1042 if (skparent)
1043 sock_put(skparent);
1044 }
1045
1046 static struct proto pep_proto = {
1047 .close = pep_sock_close,
1048 .accept = pep_sock_accept,
1049 .ioctl = pep_ioctl,
1050 .init = pep_init,
1051 .setsockopt = pep_setsockopt,
1052 .getsockopt = pep_getsockopt,
1053 .sendmsg = pep_sendmsg,
1054 .recvmsg = pep_recvmsg,
1055 .backlog_rcv = pep_do_rcv,
1056 .hash = pn_sock_hash,
1057 .unhash = pep_sock_unhash,
1058 .get_port = pn_sock_get_port,
1059 .obj_size = sizeof(struct pep_sock),
1060 .owner = THIS_MODULE,
1061 .name = "PNPIPE",
1062 };
1063
1064 static struct phonet_protocol pep_pn_proto = {
1065 .ops = &phonet_stream_ops,
1066 .prot = &pep_proto,
1067 .sock_type = SOCK_SEQPACKET,
1068 };
1069
1070 static int __init pep_register(void)
1071 {
1072 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1073 }
1074
1075 static void __exit pep_unregister(void)
1076 {
1077 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1078 }
1079
1080 module_init(pep_register);
1081 module_exit(pep_unregister);
1082 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1083 MODULE_DESCRIPTION("Phonet pipe protocol");
1084 MODULE_LICENSE("GPL");
1085 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
Linux for Ginger Game Console