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Merge branch 'tty-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh...
[wandboard.git] / net / phonet / pep.c
blob3e60f2e4e6c2d1e5982b2a56aed64fc38aa49259
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/slab.h>
27 #include <linux/socket.h>
28 #include <net/sock.h>
29 #include <net/tcp_states.h>
30 #include <asm/ioctls.h>
31
32 #include <linux/phonet.h>
33 #include <net/phonet/phonet.h>
34 #include <net/phonet/pep.h>
35 #include <net/phonet/gprs.h>
36
37 /* sk_state values:
38 * TCP_CLOSE sock not in use yet
39 * TCP_CLOSE_WAIT disconnected pipe
40 * TCP_LISTEN listening pipe endpoint
41 * TCP_SYN_RECV connected pipe in disabled state
42 * TCP_ESTABLISHED connected pipe in enabled state
43 *
44 * pep_sock locking:
45 * - sk_state, ackq, hlist: sock lock needed
46 * - listener: read only
47 * - pipe_handle: read only
48 */
49
50 #define CREDITS_MAX 10
51 #define CREDITS_THR 7
52
53 static const struct sockaddr_pn pipe_srv = {
54 .spn_family = AF_PHONET,
55 .spn_resource = 0xD9, /* pipe service */
56 };
57
58 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
59
60 /* Get the next TLV sub-block. */
61 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
62 void *buf)
63 {
64 void *data = NULL;
65 struct {
66 u8 sb_type;
67 u8 sb_len;
68 } *ph, h;
69 int buflen = *plen;
70
71 ph = skb_header_pointer(skb, 0, 2, &h);
72 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
73 return NULL;
74 ph->sb_len -= 2;
75 *ptype = ph->sb_type;
76 *plen = ph->sb_len;
77
78 if (buflen > ph->sb_len)
79 buflen = ph->sb_len;
80 data = skb_header_pointer(skb, 2, buflen, buf);
81 __skb_pull(skb, 2 + ph->sb_len);
82 return data;
83 }
84
85 static int pep_reply(struct sock *sk, struct sk_buff *oskb,
86 u8 code, const void *data, int len, gfp_t priority)
87 {
88 const struct pnpipehdr *oph = pnp_hdr(oskb);
89 struct pnpipehdr *ph;
90 struct sk_buff *skb;
91
92 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
93 if (!skb)
94 return -ENOMEM;
95 skb_set_owner_w(skb, sk);
96
97 skb_reserve(skb, MAX_PNPIPE_HEADER);
98 __skb_put(skb, len);
99 skb_copy_to_linear_data(skb, data, len);
100 __skb_push(skb, sizeof(*ph));
101 skb_reset_transport_header(skb);
102 ph = pnp_hdr(skb);
103 ph->utid = oph->utid;
104 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
105 ph->pipe_handle = oph->pipe_handle;
106 ph->error_code = code;
107
108 return pn_skb_send(sk, skb, &pipe_srv);
109 }
110
111 #define PAD 0x00
112
113 #ifdef CONFIG_PHONET_PIPECTRLR
114 static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len)
115 {
116 int i, j;
117 u8 base_fc, final_fc;
118
119 for (i = 0; i < len; i++) {
120 base_fc = host_fc[i];
121 for (j = 0; j < len; j++) {
122 if (remote_fc[j] == base_fc) {
123 final_fc = base_fc;
124 goto done;
125 }
126 }
127 }
128 return -EINVAL;
129
130 done:
131 return final_fc;
132
133 }
134
135 static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb,
136 u8 *pref_rx_fc, u8 *req_tx_fc)
137 {
138 struct pnpipehdr *hdr;
139 u8 n_sb;
140
141 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
142 return -EINVAL;
143
144 hdr = pnp_hdr(skb);
145 n_sb = hdr->data[4];
146
147 __skb_pull(skb, sizeof(*hdr) + 4);
148 while (n_sb > 0) {
149 u8 type, buf[3], len = sizeof(buf);
150 u8 *data = pep_get_sb(skb, &type, &len, buf);
151
152 if (data == NULL)
153 return -EINVAL;
154
155 switch (type) {
156 case PN_PIPE_SB_REQUIRED_FC_TX:
157 if (len < 3 || (data[2] | data[3] | data[4]) > 3)
158 break;
159 req_tx_fc[0] = data[2];
160 req_tx_fc[1] = data[3];
161 req_tx_fc[2] = data[4];
162 break;
163
164 case PN_PIPE_SB_PREFERRED_FC_RX:
165 if (len < 3 || (data[2] | data[3] | data[4]) > 3)
166 break;
167 pref_rx_fc[0] = data[2];
168 pref_rx_fc[1] = data[3];
169 pref_rx_fc[2] = data[4];
170 break;
171
172 }
173 n_sb--;
174 }
175 return 0;
176 }
177
178 static int pipe_handler_send_req(struct sock *sk, u8 utid,
179 u8 msg_id, gfp_t priority)
180 {
181 int len;
182 struct pnpipehdr *ph;
183 struct sk_buff *skb;
184 struct pep_sock *pn = pep_sk(sk);
185
186 static const u8 data[4] = {
187 PAD, PAD, PAD, PAD,
188 };
189
190 switch (msg_id) {
191 case PNS_PEP_CONNECT_REQ:
192 len = sizeof(data);
193 break;
194
195 case PNS_PEP_DISCONNECT_REQ:
196 case PNS_PEP_ENABLE_REQ:
197 case PNS_PEP_DISABLE_REQ:
198 len = 0;
199 break;
200
201 default:
202 return -EINVAL;
203 }
204
205 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
206 if (!skb)
207 return -ENOMEM;
208 skb_set_owner_w(skb, sk);
209
210 skb_reserve(skb, MAX_PNPIPE_HEADER);
211 if (len) {
212 __skb_put(skb, len);
213 skb_copy_to_linear_data(skb, data, len);
214 }
215 __skb_push(skb, sizeof(*ph));
216 skb_reset_transport_header(skb);
217 ph = pnp_hdr(skb);
218 ph->utid = utid;
219 ph->message_id = msg_id;
220 ph->pipe_handle = pn->pipe_handle;
221 ph->error_code = PN_PIPE_NO_ERROR;
222
223 return pn_skb_send(sk, skb, &pn->remote_pep);
224 }
225
226 static int pipe_handler_send_created_ind(struct sock *sk,
227 u8 utid, u8 msg_id)
228 {
229 int err_code;
230 struct pnpipehdr *ph;
231 struct sk_buff *skb;
232
233 struct pep_sock *pn = pep_sk(sk);
234 static u8 data[4] = {
235 0x03, 0x04,
236 };
237 data[2] = pn->tx_fc;
238 data[3] = pn->rx_fc;
239
240 /*
241 * actually, below is number of sub-blocks and not error code.
242 * Pipe_created_ind message format does not have any
243 * error code field. However, the Phonet stack will always send
244 * an error code as part of pnpipehdr. So, use that err_code to
245 * specify the number of sub-blocks.
246 */
247 err_code = 0x01;
248
249 skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC);
250 if (!skb)
251 return -ENOMEM;
252 skb_set_owner_w(skb, sk);
253
254 skb_reserve(skb, MAX_PNPIPE_HEADER);
255 __skb_put(skb, sizeof(data));
256 skb_copy_to_linear_data(skb, data, sizeof(data));
257 __skb_push(skb, sizeof(*ph));
258 skb_reset_transport_header(skb);
259 ph = pnp_hdr(skb);
260 ph->utid = utid;
261 ph->message_id = msg_id;
262 ph->pipe_handle = pn->pipe_handle;
263 ph->error_code = err_code;
264
265 return pn_skb_send(sk, skb, &pn->remote_pep);
266 }
267
268 static int pipe_handler_send_ind(struct sock *sk, u8 utid, u8 msg_id)
269 {
270 int err_code;
271 struct pnpipehdr *ph;
272 struct sk_buff *skb;
273 struct pep_sock *pn = pep_sk(sk);
274
275 /*
276 * actually, below is a filler.
277 * Pipe_enabled/disabled_ind message format does not have any
278 * error code field. However, the Phonet stack will always send
279 * an error code as part of pnpipehdr. So, use that err_code to
280 * specify the filler value.
281 */
282 err_code = 0x0;
283
284 skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
285 if (!skb)
286 return -ENOMEM;
287 skb_set_owner_w(skb, sk);
288
289 skb_reserve(skb, MAX_PNPIPE_HEADER);
290 __skb_push(skb, sizeof(*ph));
291 skb_reset_transport_header(skb);
292 ph = pnp_hdr(skb);
293 ph->utid = utid;
294 ph->message_id = msg_id;
295 ph->pipe_handle = pn->pipe_handle;
296 ph->error_code = err_code;
297
298 return pn_skb_send(sk, skb, &pn->remote_pep);
299 }
300
301 static int pipe_handler_enable_pipe(struct sock *sk, int enable)
302 {
303 int utid, req;
304
305 if (enable) {
306 utid = PNS_PIPE_ENABLE_UTID;
307 req = PNS_PEP_ENABLE_REQ;
308 } else {
309 utid = PNS_PIPE_DISABLE_UTID;
310 req = PNS_PEP_DISABLE_REQ;
311 }
312 return pipe_handler_send_req(sk, utid, req, GFP_ATOMIC);
313 }
314 #endif
315
316 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
317 {
318 static const u8 data[20] = {
319 PAD, PAD, PAD, 2 /* sub-blocks */,
320 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
321 PN_MULTI_CREDIT_FLOW_CONTROL,
322 PN_ONE_CREDIT_FLOW_CONTROL,
323 PN_LEGACY_FLOW_CONTROL,
324 PAD,
325 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
326 PN_MULTI_CREDIT_FLOW_CONTROL,
327 PN_ONE_CREDIT_FLOW_CONTROL,
328 PN_LEGACY_FLOW_CONTROL,
329 PAD,
330 };
331
332 might_sleep();
333 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
334 GFP_KERNEL);
335 }
336
337 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
338 {
339 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
340 WARN_ON(code == PN_PIPE_NO_ERROR);
341 return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
342 }
343
344 /* Control requests are not sent by the pipe service and have a specific
345 * message format. */
346 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
347 gfp_t priority)
348 {
349 const struct pnpipehdr *oph = pnp_hdr(oskb);
350 struct sk_buff *skb;
351 struct pnpipehdr *ph;
352 struct sockaddr_pn dst;
353
354 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
355 if (!skb)
356 return -ENOMEM;
357 skb_set_owner_w(skb, sk);
358
359 skb_reserve(skb, MAX_PHONET_HEADER);
360 ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
361
362 ph->utid = oph->utid;
363 ph->message_id = PNS_PEP_CTRL_RESP;
364 ph->pipe_handle = oph->pipe_handle;
365 ph->data[0] = oph->data[1]; /* CTRL id */
366 ph->data[1] = oph->data[0]; /* PEP type */
367 ph->data[2] = code; /* error code, at an usual offset */
368 ph->data[3] = PAD;
369 ph->data[4] = PAD;
370
371 pn_skb_get_src_sockaddr(oskb, &dst);
372 return pn_skb_send(sk, skb, &dst);
373 }
374
375 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
376 {
377 struct pep_sock *pn = pep_sk(sk);
378 struct pnpipehdr *ph;
379 struct sk_buff *skb;
380
381 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
382 if (!skb)
383 return -ENOMEM;
384 skb_set_owner_w(skb, sk);
385
386 skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
387 __skb_push(skb, sizeof(*ph) + 4);
388 skb_reset_transport_header(skb);
389 ph = pnp_hdr(skb);
390 ph->utid = 0;
391 ph->message_id = PNS_PEP_STATUS_IND;
392 ph->pipe_handle = pn->pipe_handle;
393 ph->pep_type = PN_PEP_TYPE_COMMON;
394 ph->data[1] = type;
395 ph->data[2] = PAD;
396 ph->data[3] = PAD;
397 ph->data[4] = status;
398
399 #ifdef CONFIG_PHONET_PIPECTRLR
400 return pn_skb_send(sk, skb, &pn->remote_pep);
401 #else
402 return pn_skb_send(sk, skb, &pipe_srv);
403 #endif
404 }
405
406 /* Send our RX flow control information to the sender.
407 * Socket must be locked. */
408 static void pipe_grant_credits(struct sock *sk)
409 {
410 struct pep_sock *pn = pep_sk(sk);
411
412 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
413
414 switch (pn->rx_fc) {
415 case PN_LEGACY_FLOW_CONTROL: /* TODO */
416 break;
417 case PN_ONE_CREDIT_FLOW_CONTROL:
418 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
419 PEP_IND_READY, GFP_ATOMIC);
420 pn->rx_credits = 1;
421 break;
422 case PN_MULTI_CREDIT_FLOW_CONTROL:
423 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
424 break;
425 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
426 CREDITS_MAX - pn->rx_credits,
427 GFP_ATOMIC) == 0)
428 pn->rx_credits = CREDITS_MAX;
429 break;
430 }
431 }
432
433 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
434 {
435 struct pep_sock *pn = pep_sk(sk);
436 struct pnpipehdr *hdr;
437 int wake = 0;
438
439 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
440 return -EINVAL;
441
442 hdr = pnp_hdr(skb);
443 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
444 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
445 (unsigned)hdr->data[0]);
446 return -EOPNOTSUPP;
447 }
448
449 switch (hdr->data[1]) {
450 case PN_PEP_IND_FLOW_CONTROL:
451 switch (pn->tx_fc) {
452 case PN_LEGACY_FLOW_CONTROL:
453 switch (hdr->data[4]) {
454 case PEP_IND_BUSY:
455 atomic_set(&pn->tx_credits, 0);
456 break;
457 case PEP_IND_READY:
458 atomic_set(&pn->tx_credits, wake = 1);
459 break;
460 }
461 break;
462 case PN_ONE_CREDIT_FLOW_CONTROL:
463 if (hdr->data[4] == PEP_IND_READY)
464 atomic_set(&pn->tx_credits, wake = 1);
465 break;
466 }
467 break;
468
469 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
470 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
471 break;
472 atomic_add(wake = hdr->data[4], &pn->tx_credits);
473 break;
474
475 default:
476 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
477 (unsigned)hdr->data[1]);
478 return -EOPNOTSUPP;
479 }
480 if (wake)
481 sk->sk_write_space(sk);
482 return 0;
483 }
484
485 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
486 {
487 struct pep_sock *pn = pep_sk(sk);
488 struct pnpipehdr *hdr = pnp_hdr(skb);
489 u8 n_sb = hdr->data[0];
490
491 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
492 __skb_pull(skb, sizeof(*hdr));
493 while (n_sb > 0) {
494 u8 type, buf[2], len = sizeof(buf);
495 u8 *data = pep_get_sb(skb, &type, &len, buf);
496
497 if (data == NULL)
498 return -EINVAL;
499 switch (type) {
500 case PN_PIPE_SB_NEGOTIATED_FC:
501 if (len < 2 || (data[0] | data[1]) > 3)
502 break;
503 pn->tx_fc = data[0] & 3;
504 pn->rx_fc = data[1] & 3;
505 break;
506 }
507 n_sb--;
508 }
509 return 0;
510 }
511
512 /* Queue an skb to a connected sock.
513 * Socket lock must be held. */
514 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
515 {
516 struct pep_sock *pn = pep_sk(sk);
517 struct pnpipehdr *hdr = pnp_hdr(skb);
518 struct sk_buff_head *queue;
519 int err = 0;
520
521 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
522
523 switch (hdr->message_id) {
524 case PNS_PEP_CONNECT_REQ:
525 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
526 break;
527
528 case PNS_PEP_DISCONNECT_REQ:
529 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
530 sk->sk_state = TCP_CLOSE_WAIT;
531 if (!sock_flag(sk, SOCK_DEAD))
532 sk->sk_state_change(sk);
533 break;
534
535 #ifdef CONFIG_PHONET_PIPECTRLR
536 case PNS_PEP_DISCONNECT_RESP:
537 pn->pipe_state = PIPE_IDLE;
538 sk->sk_state = TCP_CLOSE;
539 break;
540 #endif
541
542 case PNS_PEP_ENABLE_REQ:
543 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
544 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
545 break;
546
547 #ifdef CONFIG_PHONET_PIPECTRLR
548 case PNS_PEP_ENABLE_RESP:
549 pn->pipe_state = PIPE_ENABLED;
550 pipe_handler_send_ind(sk, PNS_PIPE_ENABLED_IND_UTID,
551 PNS_PIPE_ENABLED_IND);
552
553 if (!pn_flow_safe(pn->tx_fc)) {
554 atomic_set(&pn->tx_credits, 1);
555 sk->sk_write_space(sk);
556 }
557 if (sk->sk_state == TCP_ESTABLISHED)
558 break; /* Nothing to do */
559 sk->sk_state = TCP_ESTABLISHED;
560 pipe_grant_credits(sk);
561 break;
562 #endif
563
564 case PNS_PEP_RESET_REQ:
565 switch (hdr->state_after_reset) {
566 case PN_PIPE_DISABLE:
567 pn->init_enable = 0;
568 break;
569 case PN_PIPE_ENABLE:
570 pn->init_enable = 1;
571 break;
572 default: /* not allowed to send an error here!? */
573 err = -EINVAL;
574 goto out;
575 }
576 /* fall through */
577 case PNS_PEP_DISABLE_REQ:
578 atomic_set(&pn->tx_credits, 0);
579 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
580 break;
581
582 #ifdef CONFIG_PHONET_PIPECTRLR
583 case PNS_PEP_DISABLE_RESP:
584 pn->pipe_state = PIPE_DISABLED;
585 atomic_set(&pn->tx_credits, 0);
586 pipe_handler_send_ind(sk, PNS_PIPE_DISABLED_IND_UTID,
587 PNS_PIPE_DISABLED_IND);
588 sk->sk_state = TCP_SYN_RECV;
589 pn->rx_credits = 0;
590 break;
591 #endif
592
593 case PNS_PEP_CTRL_REQ:
594 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
595 atomic_inc(&sk->sk_drops);
596 break;
597 }
598 __skb_pull(skb, 4);
599 queue = &pn->ctrlreq_queue;
600 goto queue;
601
602 case PNS_PIPE_ALIGNED_DATA:
603 __skb_pull(skb, 1);
604 /* fall through */
605 case PNS_PIPE_DATA:
606 __skb_pull(skb, 3); /* Pipe data header */
607 if (!pn_flow_safe(pn->rx_fc)) {
608 err = sock_queue_rcv_skb(sk, skb);
609 if (!err)
610 return 0;
611 break;
612 }
613
614 if (pn->rx_credits == 0) {
615 atomic_inc(&sk->sk_drops);
616 err = -ENOBUFS;
617 break;
618 }
619 pn->rx_credits--;
620 queue = &sk->sk_receive_queue;
621 goto queue;
622
623 case PNS_PEP_STATUS_IND:
624 pipe_rcv_status(sk, skb);
625 break;
626
627 case PNS_PIPE_REDIRECTED_IND:
628 err = pipe_rcv_created(sk, skb);
629 break;
630
631 case PNS_PIPE_CREATED_IND:
632 err = pipe_rcv_created(sk, skb);
633 if (err)
634 break;
635 /* fall through */
636 case PNS_PIPE_RESET_IND:
637 if (!pn->init_enable)
638 break;
639 /* fall through */
640 case PNS_PIPE_ENABLED_IND:
641 if (!pn_flow_safe(pn->tx_fc)) {
642 atomic_set(&pn->tx_credits, 1);
643 sk->sk_write_space(sk);
644 }
645 if (sk->sk_state == TCP_ESTABLISHED)
646 break; /* Nothing to do */
647 sk->sk_state = TCP_ESTABLISHED;
648 pipe_grant_credits(sk);
649 break;
650
651 case PNS_PIPE_DISABLED_IND:
652 sk->sk_state = TCP_SYN_RECV;
653 pn->rx_credits = 0;
654 break;
655
656 default:
657 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
658 hdr->message_id);
659 err = -EINVAL;
660 }
661 out:
662 kfree_skb(skb);
663 return err;
664
665 queue:
666 skb->dev = NULL;
667 skb_set_owner_r(skb, sk);
668 err = skb->len;
669 skb_queue_tail(queue, skb);
670 if (!sock_flag(sk, SOCK_DEAD))
671 sk->sk_data_ready(sk, err);
672 return 0;
673 }
674
675 /* Destroy connected sock. */
676 static void pipe_destruct(struct sock *sk)
677 {
678 struct pep_sock *pn = pep_sk(sk);
679
680 skb_queue_purge(&sk->sk_receive_queue);
681 skb_queue_purge(&pn->ctrlreq_queue);
682 }
683
684 #ifdef CONFIG_PHONET_PIPECTRLR
685 static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
686 {
687 struct pep_sock *pn = pep_sk(sk);
688 u8 host_pref_rx_fc[3] = {3, 2, 1}, host_req_tx_fc[3] = {3, 2, 1};
689 u8 remote_pref_rx_fc[3], remote_req_tx_fc[3];
690 u8 negotiated_rx_fc, negotiated_tx_fc;
691 int ret;
692
693 pipe_get_flow_info(sk, skb, remote_pref_rx_fc,
694 remote_req_tx_fc);
695 negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc,
696 host_pref_rx_fc,
697 sizeof(host_pref_rx_fc));
698 negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc,
699 remote_pref_rx_fc,
700 sizeof(host_pref_rx_fc));
701
702 pn->pipe_state = PIPE_DISABLED;
703 sk->sk_state = TCP_SYN_RECV;
704 sk->sk_backlog_rcv = pipe_do_rcv;
705 sk->sk_destruct = pipe_destruct;
706 pn->rx_credits = 0;
707 pn->rx_fc = negotiated_rx_fc;
708 pn->tx_fc = negotiated_tx_fc;
709 sk->sk_state_change(sk);
710
711 ret = pipe_handler_send_created_ind(sk,
712 PNS_PIPE_CREATED_IND_UTID,
713 PNS_PIPE_CREATED_IND
714 );
715
716 return ret;
717 }
718 #endif
719
720 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
721 {
722 struct sock *newsk;
723 struct pep_sock *newpn, *pn = pep_sk(sk);
724 struct pnpipehdr *hdr;
725 struct sockaddr_pn dst;
726 u16 peer_type;
727 u8 pipe_handle, enabled, n_sb;
728 u8 aligned = 0;
729
730 if (!pskb_pull(skb, sizeof(*hdr) + 4))
731 return -EINVAL;
732
733 hdr = pnp_hdr(skb);
734 pipe_handle = hdr->pipe_handle;
735 switch (hdr->state_after_connect) {
736 case PN_PIPE_DISABLE:
737 enabled = 0;
738 break;
739 case PN_PIPE_ENABLE:
740 enabled = 1;
741 break;
742 default:
743 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
744 return -EINVAL;
745 }
746 peer_type = hdr->other_pep_type << 8;
747
748 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
749 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
750 return -ENOBUFS;
751 }
752
753 /* Parse sub-blocks (options) */
754 n_sb = hdr->data[4];
755 while (n_sb > 0) {
756 u8 type, buf[1], len = sizeof(buf);
757 const u8 *data = pep_get_sb(skb, &type, &len, buf);
758
759 if (data == NULL)
760 return -EINVAL;
761 switch (type) {
762 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
763 if (len < 1)
764 return -EINVAL;
765 peer_type = (peer_type & 0xff00) | data[0];
766 break;
767 case PN_PIPE_SB_ALIGNED_DATA:
768 aligned = data[0] != 0;
769 break;
770 }
771 n_sb--;
772 }
773
774 skb = skb_clone(skb, GFP_ATOMIC);
775 if (!skb)
776 return -ENOMEM;
777
778 /* Create a new to-be-accepted sock */
779 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
780 if (!newsk) {
781 kfree_skb(skb);
782 return -ENOMEM;
783 }
784 sock_init_data(NULL, newsk);
785 newsk->sk_state = TCP_SYN_RECV;
786 newsk->sk_backlog_rcv = pipe_do_rcv;
787 newsk->sk_protocol = sk->sk_protocol;
788 newsk->sk_destruct = pipe_destruct;
789
790 newpn = pep_sk(newsk);
791 pn_skb_get_dst_sockaddr(skb, &dst);
792 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
793 newpn->pn_sk.resource = pn->pn_sk.resource;
794 skb_queue_head_init(&newpn->ctrlreq_queue);
795 newpn->pipe_handle = pipe_handle;
796 atomic_set(&newpn->tx_credits, 0);
797 newpn->peer_type = peer_type;
798 newpn->rx_credits = 0;
799 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
800 newpn->init_enable = enabled;
801 newpn->aligned = aligned;
802
803 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
804 skb_queue_head(&newsk->sk_receive_queue, skb);
805 if (!sock_flag(sk, SOCK_DEAD))
806 sk->sk_data_ready(sk, 0);
807
808 sk_acceptq_added(sk);
809 sk_add_node(newsk, &pn->ackq);
810 return 0;
811 }
812
813 /* Listening sock must be locked */
814 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
815 const struct sockaddr_pn *dst,
816 u8 pipe_handle)
817 {
818 struct hlist_node *node;
819 struct sock *sknode;
820 u16 dobj = pn_sockaddr_get_object(dst);
821
822 sk_for_each(sknode, node, hlist) {
823 struct pep_sock *pnnode = pep_sk(sknode);
824
825 /* Ports match, but addresses might not: */
826 if (pnnode->pn_sk.sobject != dobj)
827 continue;
828 if (pnnode->pipe_handle != pipe_handle)
829 continue;
830 if (sknode->sk_state == TCP_CLOSE_WAIT)
831 continue;
832
833 sock_hold(sknode);
834 return sknode;
835 }
836 return NULL;
837 }
838
839 /*
840 * Deliver an skb to a listening sock.
841 * Socket lock must be held.
842 * We then queue the skb to the right connected sock (if any).
843 */
844 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
845 {
846 struct pep_sock *pn = pep_sk(sk);
847 struct sock *sknode;
848 struct pnpipehdr *hdr;
849 struct sockaddr_pn dst;
850 int err = NET_RX_SUCCESS;
851 u8 pipe_handle;
852
853 if (!pskb_may_pull(skb, sizeof(*hdr)))
854 goto drop;
855
856 hdr = pnp_hdr(skb);
857 pipe_handle = hdr->pipe_handle;
858 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
859 goto drop;
860
861 pn_skb_get_dst_sockaddr(skb, &dst);
862
863 /* Look for an existing pipe handle */
864 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
865 if (sknode)
866 return sk_receive_skb(sknode, skb, 1);
867
868 /* Look for a pipe handle pending accept */
869 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
870 if (sknode) {
871 sock_put(sknode);
872 if (net_ratelimit())
873 printk(KERN_WARNING"Phonet unconnected PEP ignored");
874 err = NET_RX_DROP;
875 goto drop;
876 }
877
878 switch (hdr->message_id) {
879 case PNS_PEP_CONNECT_REQ:
880 err = pep_connreq_rcv(sk, skb);
881 break;
882
883 #ifdef CONFIG_PHONET_PIPECTRLR
884 case PNS_PEP_CONNECT_RESP:
885 err = pep_connresp_rcv(sk, skb);
886 break;
887 #endif
888
889 case PNS_PEP_DISCONNECT_REQ:
890 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
891 break;
892
893 case PNS_PEP_CTRL_REQ:
894 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
895 break;
896
897 case PNS_PEP_RESET_REQ:
898 case PNS_PEP_ENABLE_REQ:
899 case PNS_PEP_DISABLE_REQ:
900 /* invalid handle is not even allowed here! */
901 default:
902 err = NET_RX_DROP;
903 }
904 drop:
905 kfree_skb(skb);
906 return err;
907 }
908
909 static int pipe_do_remove(struct sock *sk)
910 {
911 struct pep_sock *pn = pep_sk(sk);
912 struct pnpipehdr *ph;
913 struct sk_buff *skb;
914
915 skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL);
916 if (!skb)
917 return -ENOMEM;
918
919 skb_reserve(skb, MAX_PNPIPE_HEADER);
920 __skb_push(skb, sizeof(*ph));
921 skb_reset_transport_header(skb);
922 ph = pnp_hdr(skb);
923 ph->utid = 0;
924 ph->message_id = PNS_PIPE_REMOVE_REQ;
925 ph->pipe_handle = pn->pipe_handle;
926 ph->data[0] = PAD;
927
928 return pn_skb_send(sk, skb, &pipe_srv);
929 }
930
931 /* associated socket ceases to exist */
932 static void pep_sock_close(struct sock *sk, long timeout)
933 {
934 struct pep_sock *pn = pep_sk(sk);
935 int ifindex = 0;
936
937 sock_hold(sk); /* keep a reference after sk_common_release() */
938 sk_common_release(sk);
939
940 lock_sock(sk);
941 if (sk->sk_state == TCP_LISTEN) {
942 /* Destroy the listen queue */
943 struct sock *sknode;
944 struct hlist_node *p, *n;
945
946 sk_for_each_safe(sknode, p, n, &pn->ackq)
947 sk_del_node_init(sknode);
948 sk->sk_state = TCP_CLOSE;
949 } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED))
950 /* Forcefully remove dangling Phonet pipe */
951 pipe_do_remove(sk);
952
953 #ifdef CONFIG_PHONET_PIPECTRLR
954 if (pn->pipe_state != PIPE_IDLE) {
955 /* send pep disconnect request */
956 pipe_handler_send_req(sk,
957 PNS_PEP_DISCONNECT_UTID, PNS_PEP_DISCONNECT_REQ,
958 GFP_KERNEL);
959
960 pn->pipe_state = PIPE_IDLE;
961 sk->sk_state = TCP_CLOSE;
962 }
963 #endif
964
965 ifindex = pn->ifindex;
966 pn->ifindex = 0;
967 release_sock(sk);
968
969 if (ifindex)
970 gprs_detach(sk);
971 sock_put(sk);
972 }
973
974 static int pep_wait_connreq(struct sock *sk, int noblock)
975 {
976 struct task_struct *tsk = current;
977 struct pep_sock *pn = pep_sk(sk);
978 long timeo = sock_rcvtimeo(sk, noblock);
979
980 for (;;) {
981 DEFINE_WAIT(wait);
982
983 if (sk->sk_state != TCP_LISTEN)
984 return -EINVAL;
985 if (!hlist_empty(&pn->ackq))
986 break;
987 if (!timeo)
988 return -EWOULDBLOCK;
989 if (signal_pending(tsk))
990 return sock_intr_errno(timeo);
991
992 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
993 TASK_INTERRUPTIBLE);
994 release_sock(sk);
995 timeo = schedule_timeout(timeo);
996 lock_sock(sk);
997 finish_wait(sk_sleep(sk), &wait);
998 }
999
1000 return 0;
1001 }
1002
1003 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
1004 {
1005 struct pep_sock *pn = pep_sk(sk);
1006 struct sock *newsk = NULL;
1007 struct sk_buff *oskb;
1008 int err;
1009
1010 lock_sock(sk);
1011 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
1012 if (err)
1013 goto out;
1014
1015 newsk = __sk_head(&pn->ackq);
1016
1017 oskb = skb_dequeue(&newsk->sk_receive_queue);
1018 err = pep_accept_conn(newsk, oskb);
1019 if (err) {
1020 skb_queue_head(&newsk->sk_receive_queue, oskb);
1021 newsk = NULL;
1022 goto out;
1023 }
1024 kfree_skb(oskb);
1025
1026 sock_hold(sk);
1027 pep_sk(newsk)->listener = sk;
1028
1029 sock_hold(newsk);
1030 sk_del_node_init(newsk);
1031 sk_acceptq_removed(sk);
1032 sk_add_node(newsk, &pn->hlist);
1033 __sock_put(newsk);
1034
1035 out:
1036 release_sock(sk);
1037 *errp = err;
1038 return newsk;
1039 }
1040
1041 #ifdef CONFIG_PHONET_PIPECTRLR
1042 static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
1043 {
1044 struct pep_sock *pn = pep_sk(sk);
1045 struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
1046
1047 memcpy(&pn->remote_pep, spn, sizeof(struct sockaddr_pn));
1048
1049 return pipe_handler_send_req(sk,
1050 PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ,
1051 GFP_ATOMIC);
1052 }
1053 #endif
1054
1055 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
1056 {
1057 struct pep_sock *pn = pep_sk(sk);
1058 int answ;
1059
1060 switch (cmd) {
1061 case SIOCINQ:
1062 if (sk->sk_state == TCP_LISTEN)
1063 return -EINVAL;
1064
1065 lock_sock(sk);
1066 if (sock_flag(sk, SOCK_URGINLINE) &&
1067 !skb_queue_empty(&pn->ctrlreq_queue))
1068 answ = skb_peek(&pn->ctrlreq_queue)->len;
1069 else if (!skb_queue_empty(&sk->sk_receive_queue))
1070 answ = skb_peek(&sk->sk_receive_queue)->len;
1071 else
1072 answ = 0;
1073 release_sock(sk);
1074 return put_user(answ, (int __user *)arg);
1075 }
1076
1077 return -ENOIOCTLCMD;
1078 }
1079
1080 static int pep_init(struct sock *sk)
1081 {
1082 struct pep_sock *pn = pep_sk(sk);
1083
1084 INIT_HLIST_HEAD(&pn->ackq);
1085 INIT_HLIST_HEAD(&pn->hlist);
1086 skb_queue_head_init(&pn->ctrlreq_queue);
1087 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
1088 return 0;
1089 }
1090
1091 static int pep_setsockopt(struct sock *sk, int level, int optname,
1092 char __user *optval, unsigned int optlen)
1093 {
1094 struct pep_sock *pn = pep_sk(sk);
1095 int val = 0, err = 0;
1096
1097 if (level != SOL_PNPIPE)
1098 return -ENOPROTOOPT;
1099 if (optlen >= sizeof(int)) {
1100 if (get_user(val, (int __user *) optval))
1101 return -EFAULT;
1102 }
1103
1104 lock_sock(sk);
1105 switch (optname) {
1106 #ifdef CONFIG_PHONET_PIPECTRLR
1107 case PNPIPE_PIPE_HANDLE:
1108 if (val) {
1109 if (pn->pipe_state > PIPE_IDLE) {
1110 err = -EFAULT;
1111 break;
1112 }
1113 pn->pipe_handle = val;
1114 break;
1115 }
1116 #endif
1117
1118 case PNPIPE_ENCAP:
1119 if (val && val != PNPIPE_ENCAP_IP) {
1120 err = -EINVAL;
1121 break;
1122 }
1123 if (!pn->ifindex == !val)
1124 break; /* Nothing to do! */
1125 if (!capable(CAP_NET_ADMIN)) {
1126 err = -EPERM;
1127 break;
1128 }
1129 if (val) {
1130 release_sock(sk);
1131 err = gprs_attach(sk);
1132 if (err > 0) {
1133 pn->ifindex = err;
1134 err = 0;
1135 }
1136 } else {
1137 pn->ifindex = 0;
1138 release_sock(sk);
1139 gprs_detach(sk);
1140 err = 0;
1141 }
1142 goto out_norel;
1143
1144 #ifdef CONFIG_PHONET_PIPECTRLR
1145 case PNPIPE_ENABLE:
1146 if (pn->pipe_state <= PIPE_IDLE) {
1147 err = -ENOTCONN;
1148 break;
1149 }
1150 err = pipe_handler_enable_pipe(sk, val);
1151 break;
1152 #endif
1153
1154 default:
1155 err = -ENOPROTOOPT;
1156 }
1157 release_sock(sk);
1158
1159 out_norel:
1160 return err;
1161 }
1162
1163 static int pep_getsockopt(struct sock *sk, int level, int optname,
1164 char __user *optval, int __user *optlen)
1165 {
1166 struct pep_sock *pn = pep_sk(sk);
1167 int len, val;
1168
1169 if (level != SOL_PNPIPE)
1170 return -ENOPROTOOPT;
1171 if (get_user(len, optlen))
1172 return -EFAULT;
1173
1174 switch (optname) {
1175 case PNPIPE_ENCAP:
1176 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1177 break;
1178
1179 case PNPIPE_IFINDEX:
1180 val = pn->ifindex;
1181 break;
1182
1183 #ifdef CONFIG_PHONET_PIPECTRLR
1184 case PNPIPE_ENABLE:
1185 if (pn->pipe_state <= PIPE_IDLE)
1186 return -ENOTCONN;
1187 val = pn->pipe_state != PIPE_DISABLED;
1188 break;
1189 #endif
1190
1191 default:
1192 return -ENOPROTOOPT;
1193 }
1194
1195 len = min_t(unsigned int, sizeof(int), len);
1196 if (put_user(len, optlen))
1197 return -EFAULT;
1198 if (put_user(val, (int __user *) optval))
1199 return -EFAULT;
1200 return 0;
1201 }
1202
1203 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1204 {
1205 struct pep_sock *pn = pep_sk(sk);
1206 struct pnpipehdr *ph;
1207 int err;
1208
1209 if (pn_flow_safe(pn->tx_fc) &&
1210 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1211 kfree_skb(skb);
1212 return -ENOBUFS;
1213 }
1214
1215 skb_push(skb, 3 + pn->aligned);
1216 skb_reset_transport_header(skb);
1217 ph = pnp_hdr(skb);
1218 ph->utid = 0;
1219 if (pn->aligned) {
1220 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1221 ph->data[0] = 0; /* padding */
1222 } else
1223 ph->message_id = PNS_PIPE_DATA;
1224 ph->pipe_handle = pn->pipe_handle;
1225 #ifdef CONFIG_PHONET_PIPECTRLR
1226 err = pn_skb_send(sk, skb, &pn->remote_pep);
1227 #else
1228 err = pn_skb_send(sk, skb, &pipe_srv);
1229 #endif
1230
1231 if (err && pn_flow_safe(pn->tx_fc))
1232 atomic_inc(&pn->tx_credits);
1233 return err;
1234
1235 }
1236
1237 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
1238 struct msghdr *msg, size_t len)
1239 {
1240 struct pep_sock *pn = pep_sk(sk);
1241 struct sk_buff *skb;
1242 long timeo;
1243 int flags = msg->msg_flags;
1244 int err, done;
1245
1246 if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1247 MSG_CMSG_COMPAT)) ||
1248 !(msg->msg_flags & MSG_EOR))
1249 return -EOPNOTSUPP;
1250
1251 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1252 flags & MSG_DONTWAIT, &err);
1253 if (!skb)
1254 return err;
1255
1256 skb_reserve(skb, MAX_PHONET_HEADER + 3);
1257 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1258 if (err < 0)
1259 goto outfree;
1260
1261 lock_sock(sk);
1262 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1263 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1264 err = -ENOTCONN;
1265 goto out;
1266 }
1267 if (sk->sk_state != TCP_ESTABLISHED) {
1268 /* Wait until the pipe gets to enabled state */
1269 disabled:
1270 err = sk_stream_wait_connect(sk, &timeo);
1271 if (err)
1272 goto out;
1273
1274 if (sk->sk_state == TCP_CLOSE_WAIT) {
1275 err = -ECONNRESET;
1276 goto out;
1277 }
1278 }
1279 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1280
1281 /* Wait until flow control allows TX */
1282 done = atomic_read(&pn->tx_credits);
1283 while (!done) {
1284 DEFINE_WAIT(wait);
1285
1286 if (!timeo) {
1287 err = -EAGAIN;
1288 goto out;
1289 }
1290 if (signal_pending(current)) {
1291 err = sock_intr_errno(timeo);
1292 goto out;
1293 }
1294
1295 prepare_to_wait(sk_sleep(sk), &wait,
1296 TASK_INTERRUPTIBLE);
1297 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
1298 finish_wait(sk_sleep(sk), &wait);
1299
1300 if (sk->sk_state != TCP_ESTABLISHED)
1301 goto disabled;
1302 }
1303
1304 err = pipe_skb_send(sk, skb);
1305 if (err >= 0)
1306 err = len; /* success! */
1307 skb = NULL;
1308 out:
1309 release_sock(sk);
1310 outfree:
1311 kfree_skb(skb);
1312 return err;
1313 }
1314
1315 int pep_writeable(struct sock *sk)
1316 {
1317 struct pep_sock *pn = pep_sk(sk);
1318
1319 return atomic_read(&pn->tx_credits);
1320 }
1321
1322 int pep_write(struct sock *sk, struct sk_buff *skb)
1323 {
1324 struct sk_buff *rskb, *fs;
1325 int flen = 0;
1326
1327 if (pep_sk(sk)->aligned)
1328 return pipe_skb_send(sk, skb);
1329
1330 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1331 if (!rskb) {
1332 kfree_skb(skb);
1333 return -ENOMEM;
1334 }
1335 skb_shinfo(rskb)->frag_list = skb;
1336 rskb->len += skb->len;
1337 rskb->data_len += rskb->len;
1338 rskb->truesize += rskb->len;
1339
1340 /* Avoid nested fragments */
1341 skb_walk_frags(skb, fs)
1342 flen += fs->len;
1343 skb->next = skb_shinfo(skb)->frag_list;
1344 skb_frag_list_init(skb);
1345 skb->len -= flen;
1346 skb->data_len -= flen;
1347 skb->truesize -= flen;
1348
1349 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1350 return pipe_skb_send(sk, rskb);
1351 }
1352
1353 struct sk_buff *pep_read(struct sock *sk)
1354 {
1355 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1356
1357 if (sk->sk_state == TCP_ESTABLISHED)
1358 pipe_grant_credits(sk);
1359 return skb;
1360 }
1361
1362 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
1363 struct msghdr *msg, size_t len, int noblock,
1364 int flags, int *addr_len)
1365 {
1366 struct sk_buff *skb;
1367 int err;
1368
1369 if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1370 MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1371 return -EOPNOTSUPP;
1372
1373 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1374 return -ENOTCONN;
1375
1376 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1377 /* Dequeue and acknowledge control request */
1378 struct pep_sock *pn = pep_sk(sk);
1379
1380 if (flags & MSG_PEEK)
1381 return -EOPNOTSUPP;
1382 skb = skb_dequeue(&pn->ctrlreq_queue);
1383 if (skb) {
1384 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1385 GFP_KERNEL);
1386 msg->msg_flags |= MSG_OOB;
1387 goto copy;
1388 }
1389 if (flags & MSG_OOB)
1390 return -EINVAL;
1391 }
1392
1393 skb = skb_recv_datagram(sk, flags, noblock, &err);
1394 lock_sock(sk);
1395 if (skb == NULL) {
1396 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1397 err = -ECONNRESET;
1398 release_sock(sk);
1399 return err;
1400 }
1401
1402 if (sk->sk_state == TCP_ESTABLISHED)
1403 pipe_grant_credits(sk);
1404 release_sock(sk);
1405 copy:
1406 msg->msg_flags |= MSG_EOR;
1407 if (skb->len > len)
1408 msg->msg_flags |= MSG_TRUNC;
1409 else
1410 len = skb->len;
1411
1412 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1413 if (!err)
1414 err = (flags & MSG_TRUNC) ? skb->len : len;
1415
1416 skb_free_datagram(sk, skb);
1417 return err;
1418 }
1419
1420 static void pep_sock_unhash(struct sock *sk)
1421 {
1422 struct pep_sock *pn = pep_sk(sk);
1423 struct sock *skparent = NULL;
1424
1425 lock_sock(sk);
1426
1427 #ifndef CONFIG_PHONET_PIPECTRLR
1428 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1429 skparent = pn->listener;
1430 release_sock(sk);
1431
1432 pn = pep_sk(skparent);
1433 lock_sock(skparent);
1434 sk_del_node_init(sk);
1435 sk = skparent;
1436 }
1437 #endif
1438 /* Unhash a listening sock only when it is closed
1439 * and all of its active connected pipes are closed. */
1440 if (hlist_empty(&pn->hlist))
1441 pn_sock_unhash(&pn->pn_sk.sk);
1442 release_sock(sk);
1443
1444 if (skparent)
1445 sock_put(skparent);
1446 }
1447
1448 static struct proto pep_proto = {
1449 .close = pep_sock_close,
1450 .accept = pep_sock_accept,
1451 #ifdef CONFIG_PHONET_PIPECTRLR
1452 .connect = pep_sock_connect,
1453 #endif
1454 .ioctl = pep_ioctl,
1455 .init = pep_init,
1456 .setsockopt = pep_setsockopt,
1457 .getsockopt = pep_getsockopt,
1458 .sendmsg = pep_sendmsg,
1459 .recvmsg = pep_recvmsg,
1460 .backlog_rcv = pep_do_rcv,
1461 .hash = pn_sock_hash,
1462 .unhash = pep_sock_unhash,
1463 .get_port = pn_sock_get_port,
1464 .obj_size = sizeof(struct pep_sock),
1465 .owner = THIS_MODULE,
1466 .name = "PNPIPE",
1467 };
1468
1469 static struct phonet_protocol pep_pn_proto = {
1470 .ops = &phonet_stream_ops,
1471 .prot = &pep_proto,
1472 .sock_type = SOCK_SEQPACKET,
1473 };
1474
1475 static int __init pep_register(void)
1476 {
1477 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1478 }
1479
1480 static void __exit pep_unregister(void)
1481 {
1482 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1483 }
1484
1485 module_init(pep_register);
1486 module_exit(pep_unregister);
1487 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1488 MODULE_DESCRIPTION("Phonet pipe protocol");
1489 MODULE_LICENSE("GPL");
1490 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
WandBoard kernel