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Phonet: return an error when packet TX fails
[deliverable/linux.git] / net / phonet / pep.c
CommitLineData
9641458d
RDC		 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>
5a0e3ad6 26#include <linux/slab.h>
9641458d
RDC		 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>
02a47617 35#include <net/phonet/gprs.h>
9641458d
RDC		 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
9641458d
RDC		 53#define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
54
55/* Get the next TLV sub-block. */
56static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
57 void *buf)
58{
59 void *data = NULL;
60 struct {
61 u8 sb_type;
62 u8 sb_len;
63 } *ph, h;
64 int buflen = *plen;
65
66 ph = skb_header_pointer(skb, 0, 2, &h);
67 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
68 return NULL;
69 ph->sb_len -= 2;
70 *ptype = ph->sb_type;
71 *plen = ph->sb_len;
72
73 if (buflen > ph->sb_len)
74 buflen = ph->sb_len;
75 data = skb_header_pointer(skb, 2, buflen, buf);
76 __skb_pull(skb, 2 + ph->sb_len);
77 return data;
78}
79
80static int pep_reply(struct sock *sk, struct sk_buff *oskb,
81 u8 code, const void *data, int len, gfp_t priority)
82{
83 const struct pnpipehdr *oph = pnp_hdr(oskb);
84 struct pnpipehdr *ph;
85 struct sk_buff *skb;
14ba8fae 86 struct sockaddr_pn peer;
9641458d
RDC		 87
88 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
89 if (!skb)
90 return -ENOMEM;
91 skb_set_owner_w(skb, sk);
92
93 skb_reserve(skb, MAX_PNPIPE_HEADER);
94 __skb_put(skb, len);
95 skb_copy_to_linear_data(skb, data, len);
96 __skb_push(skb, sizeof(*ph));
97 skb_reset_transport_header(skb);
98 ph = pnp_hdr(skb);
99 ph->utid = oph->utid;
100 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
101 ph->pipe_handle = oph->pipe_handle;
102 ph->error_code = code;
103
14ba8fae
RDC		 104 pn_skb_get_src_sockaddr(oskb, &peer);
105 return pn_skb_send(sk, skb, &peer);
9641458d
RDC		 106}
107
108#define PAD 0x00
8d98efa8
KS		 109
110#ifdef CONFIG_PHONET_PIPECTRLR
0165d69b 111static int pipe_handler_send_req(struct sock *sk, u8 msg_id, gfp_t priority)
8d98efa8
KS		 112{
113 int len;
114 struct pnpipehdr *ph;
115 struct sk_buff *skb;
b3d62553 116 struct pep_sock *pn = pep_sk(sk);
8d98efa8
KS		 117
118 static const u8 data[4] = {
119 PAD, PAD, PAD, PAD,
120 };
121
122 switch (msg_id) {
123 case PNS_PEP_CONNECT_REQ:
124 len = sizeof(data);
125 break;
126
127 case PNS_PEP_DISCONNECT_REQ:
128 case PNS_PEP_ENABLE_REQ:
129 case PNS_PEP_DISABLE_REQ:
130 len = 0;
131 break;
132
133 default:
134 return -EINVAL;
135 }
136
137 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
138 if (!skb)
139 return -ENOMEM;
140 skb_set_owner_w(skb, sk);
141
142 skb_reserve(skb, MAX_PNPIPE_HEADER);
143 if (len) {
144 __skb_put(skb, len);
145 skb_copy_to_linear_data(skb, data, len);
146 }
147 __skb_push(skb, sizeof(*ph));
148 skb_reset_transport_header(skb);
149 ph = pnp_hdr(skb);
0165d69b 150 ph->utid = msg_id; /* whatever */
8d98efa8 151 ph->message_id = msg_id;
b3d62553 152 ph->pipe_handle = pn->pipe_handle;
8d98efa8
KS		 153 ph->error_code = PN_PIPE_NO_ERROR;
154
14ba8fae 155 return pn_skb_send(sk, skb, NULL);
8d98efa8
KS		 156}
157
0165d69b 158static int pipe_handler_send_created_ind(struct sock *sk, u8 msg_id)
8d98efa8
KS		 159{
160 int err_code;
161 struct pnpipehdr *ph;
162 struct sk_buff *skb;
8d98efa8 163
b3d62553 164 struct pep_sock *pn = pep_sk(sk);
8d98efa8
KS		 165 static u8 data[4] = {
166 0x03, 0x04,
167 };
b3d62553
KS		 168 data[2] = pn->tx_fc;
169 data[3] = pn->rx_fc;
8d98efa8
KS		 170
171 /*
172 * actually, below is number of sub-blocks and not error code.
173 * Pipe_created_ind message format does not have any
174 * error code field. However, the Phonet stack will always send
175 * an error code as part of pnpipehdr. So, use that err_code to
176 * specify the number of sub-blocks.
177 */
178 err_code = 0x01;
179
180 skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC);
181 if (!skb)
182 return -ENOMEM;
183 skb_set_owner_w(skb, sk);
184
185 skb_reserve(skb, MAX_PNPIPE_HEADER);
186 __skb_put(skb, sizeof(data));
187 skb_copy_to_linear_data(skb, data, sizeof(data));
188 __skb_push(skb, sizeof(*ph));
189 skb_reset_transport_header(skb);
190 ph = pnp_hdr(skb);
0165d69b 191 ph->utid = 0;
8d98efa8 192 ph->message_id = msg_id;
b3d62553 193 ph->pipe_handle = pn->pipe_handle;
8d98efa8
KS		 194 ph->error_code = err_code;
195
14ba8fae 196 return pn_skb_send(sk, skb, NULL);
8d98efa8
KS		 197}
198
0165d69b 199static int pipe_handler_send_ind(struct sock *sk, u8 msg_id)
8d98efa8
KS		 200{
201 int err_code;
202 struct pnpipehdr *ph;
203 struct sk_buff *skb;
b3d62553 204 struct pep_sock *pn = pep_sk(sk);
8d98efa8
KS		 205
206 /*
207 * actually, below is a filler.
208 * Pipe_enabled/disabled_ind message format does not have any
209 * error code field. However, the Phonet stack will always send
210 * an error code as part of pnpipehdr. So, use that err_code to
211 * specify the filler value.
212 */
213 err_code = 0x0;
214
215 skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
216 if (!skb)
217 return -ENOMEM;
218 skb_set_owner_w(skb, sk);
219
220 skb_reserve(skb, MAX_PNPIPE_HEADER);
221 __skb_push(skb, sizeof(*ph));
222 skb_reset_transport_header(skb);
223 ph = pnp_hdr(skb);
0165d69b 224 ph->utid = 0;
8d98efa8 225 ph->message_id = msg_id;
b3d62553 226 ph->pipe_handle = pn->pipe_handle;
8d98efa8
KS		 227 ph->error_code = err_code;
228
14ba8fae 229 return pn_skb_send(sk, skb, NULL);
8d98efa8
KS		 230}
231
03789f26 232static int pipe_handler_enable_pipe(struct sock *sk, int enable)
8d98efa8 233{
0165d69b
RDC		 234 u8 id = enable ? PNS_PEP_ENABLE_REQ : PNS_PEP_DISABLE_REQ;
235
236 return pipe_handler_send_req(sk, id, GFP_KERNEL);
8d98efa8
KS		 237}
238#endif
239
9641458d
RDC		 240static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
241{
242 static const u8 data[20] = {
243 PAD, PAD, PAD, 2 /* sub-blocks */,
244 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
245 PN_MULTI_CREDIT_FLOW_CONTROL,
246 PN_ONE_CREDIT_FLOW_CONTROL,
247 PN_LEGACY_FLOW_CONTROL,
248 PAD,
249 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
250 PN_MULTI_CREDIT_FLOW_CONTROL,
251 PN_ONE_CREDIT_FLOW_CONTROL,
252 PN_LEGACY_FLOW_CONTROL,
253 PAD,
254 };
255
256 might_sleep();
257 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
258 GFP_KERNEL);
259}
260
261static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
262{
263 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
264 WARN_ON(code == PN_PIPE_NO_ERROR);
265 return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
266}
267
268/* Control requests are not sent by the pipe service and have a specific
269 * message format. */
c41bd97f
RDC		 270static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
271 gfp_t priority)
9641458d
RDC		 272{
273 const struct pnpipehdr *oph = pnp_hdr(oskb);
274 struct sk_buff *skb;
275 struct pnpipehdr *ph;
276 struct sockaddr_pn dst;
277
c41bd97f 278 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
9641458d
RDC		 279 if (!skb)
280 return -ENOMEM;
281 skb_set_owner_w(skb, sk);
282
283 skb_reserve(skb, MAX_PHONET_HEADER);
284 ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
285
286 ph->utid = oph->utid;
287 ph->message_id = PNS_PEP_CTRL_RESP;
288 ph->pipe_handle = oph->pipe_handle;
289 ph->data[0] = oph->data[1]; /* CTRL id */
290 ph->data[1] = oph->data[0]; /* PEP type */
291 ph->data[2] = code; /* error code, at an usual offset */
292 ph->data[3] = PAD;
293 ph->data[4] = PAD;
294
295 pn_skb_get_src_sockaddr(oskb, &dst);
296 return pn_skb_send(sk, skb, &dst);
297}
298
299static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
300{
301 struct pep_sock *pn = pep_sk(sk);
302 struct pnpipehdr *ph;
303 struct sk_buff *skb;
304
305 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
306 if (!skb)
307 return -ENOMEM;
308 skb_set_owner_w(skb, sk);
309
310 skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
311 __skb_push(skb, sizeof(*ph) + 4);
312 skb_reset_transport_header(skb);
313 ph = pnp_hdr(skb);
314 ph->utid = 0;
315 ph->message_id = PNS_PEP_STATUS_IND;
316 ph->pipe_handle = pn->pipe_handle;
317 ph->pep_type = PN_PEP_TYPE_COMMON;
318 ph->data[1] = type;
319 ph->data[2] = PAD;
320 ph->data[3] = PAD;
321 ph->data[4] = status;
322
14ba8fae 323 return pn_skb_send(sk, skb, NULL);
9641458d
RDC		 324}
325
326/* Send our RX flow control information to the sender.
327 * Socket must be locked. */
328static void pipe_grant_credits(struct sock *sk)
329{
330 struct pep_sock *pn = pep_sk(sk);
331
332 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
333
334 switch (pn->rx_fc) {
335 case PN_LEGACY_FLOW_CONTROL: /* TODO */
336 break;
337 case PN_ONE_CREDIT_FLOW_CONTROL:
338 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
339 PEP_IND_READY, GFP_ATOMIC);
340 pn->rx_credits = 1;
341 break;
342 case PN_MULTI_CREDIT_FLOW_CONTROL:
343 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
344 break;
345 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
346 CREDITS_MAX - pn->rx_credits,
347 GFP_ATOMIC) == 0)
348 pn->rx_credits = CREDITS_MAX;
349 break;
350 }
351}
352
353static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
354{
355 struct pep_sock *pn = pep_sk(sk);
a91e7d47 356 struct pnpipehdr *hdr;
be677730 357 int wake = 0;
9641458d
RDC		 358
359 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
360 return -EINVAL;
361
a91e7d47 362 hdr = pnp_hdr(skb);
9641458d
RDC		 363 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
364 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
365 (unsigned)hdr->data[0]);
366 return -EOPNOTSUPP;
367 }
368
369 switch (hdr->data[1]) {
370 case PN_PEP_IND_FLOW_CONTROL:
371 switch (pn->tx_fc) {
372 case PN_LEGACY_FLOW_CONTROL:
373 switch (hdr->data[4]) {
374 case PEP_IND_BUSY:
be677730 375 atomic_set(&pn->tx_credits, 0);
9641458d
RDC		 376 break;
377 case PEP_IND_READY:
be677730 378 atomic_set(&pn->tx_credits, wake = 1);
9641458d
RDC		 379 break;
380 }
381 break;
382 case PN_ONE_CREDIT_FLOW_CONTROL:
383 if (hdr->data[4] == PEP_IND_READY)
be677730 384 atomic_set(&pn->tx_credits, wake = 1);
9641458d
RDC		 385 break;
386 }
387 break;
388
389 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
390 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
391 break;
be677730 392 atomic_add(wake = hdr->data[4], &pn->tx_credits);
9641458d
RDC		 393 break;
394
395 default:
396 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
397 (unsigned)hdr->data[1]);
398 return -EOPNOTSUPP;
399 }
be677730 400 if (wake)
9641458d
RDC		 401 sk->sk_write_space(sk);
402 return 0;
403}
404
405static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
406{
407 struct pep_sock *pn = pep_sk(sk);
408 struct pnpipehdr *hdr = pnp_hdr(skb);
409 u8 n_sb = hdr->data[0];
410
411 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
412 __skb_pull(skb, sizeof(*hdr));
413 while (n_sb > 0) {
414 u8 type, buf[2], len = sizeof(buf);
415 u8 *data = pep_get_sb(skb, &type, &len, buf);
416
417 if (data == NULL)
418 return -EINVAL;
419 switch (type) {
420 case PN_PIPE_SB_NEGOTIATED_FC:
421 if (len < 2 || (data[0] | data[1]) > 3)
422 break;
423 pn->tx_fc = data[0] & 3;
424 pn->rx_fc = data[1] & 3;
425 break;
426 }
427 n_sb--;
428 }
429 return 0;
430}
431
432/* Queue an skb to a connected sock.
433 * Socket lock must be held. */
434static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
435{
436 struct pep_sock *pn = pep_sk(sk);
437 struct pnpipehdr *hdr = pnp_hdr(skb);
c41bd97f 438 struct sk_buff_head *queue;
9641458d
RDC		 439 int err = 0;
440
441 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
442
443 switch (hdr->message_id) {
444 case PNS_PEP_CONNECT_REQ:
445 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
446 break;
447
448 case PNS_PEP_DISCONNECT_REQ:
449 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
450 sk->sk_state = TCP_CLOSE_WAIT;
451 if (!sock_flag(sk, SOCK_DEAD))
452 sk->sk_state_change(sk);
453 break;
454
8d98efa8
KS		 455#ifdef CONFIG_PHONET_PIPECTRLR
456 case PNS_PEP_DISCONNECT_RESP:
b3d62553 457 sk->sk_state = TCP_CLOSE;
8d98efa8
KS		 458 break;
459#endif
460
9641458d
RDC		 461 case PNS_PEP_ENABLE_REQ:
462 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
463 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
464 break;
465
8d98efa8
KS		 466#ifdef CONFIG_PHONET_PIPECTRLR
467 case PNS_PEP_ENABLE_RESP:
0165d69b 468 pipe_handler_send_ind(sk, PNS_PIPE_ENABLED_IND);
8d98efa8 469
b3d62553
KS		 470 if (!pn_flow_safe(pn->tx_fc)) {
471 atomic_set(&pn->tx_credits, 1);
472 sk->sk_write_space(sk);
473 }
474 if (sk->sk_state == TCP_ESTABLISHED)
475 break; /* Nothing to do */
476 sk->sk_state = TCP_ESTABLISHED;
477 pipe_grant_credits(sk);
8d98efa8
KS		 478 break;
479#endif
480
9641458d
RDC		 481 case PNS_PEP_RESET_REQ:
482 switch (hdr->state_after_reset) {
483 case PN_PIPE_DISABLE:
484 pn->init_enable = 0;
485 break;
486 case PN_PIPE_ENABLE:
487 pn->init_enable = 1;
488 break;
489 default: /* not allowed to send an error here!? */
490 err = -EINVAL;
491 goto out;
492 }
493 /* fall through */
494 case PNS_PEP_DISABLE_REQ:
be677730 495 atomic_set(&pn->tx_credits, 0);
9641458d
RDC		 496 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
497 break;
498
8d98efa8
KS		 499#ifdef CONFIG_PHONET_PIPECTRLR
500 case PNS_PEP_DISABLE_RESP:
b3d62553 501 atomic_set(&pn->tx_credits, 0);
0165d69b 502 pipe_handler_send_ind(sk, PNS_PIPE_DISABLED_IND);
b3d62553
KS		 503 sk->sk_state = TCP_SYN_RECV;
504 pn->rx_credits = 0;
8d98efa8
KS		 505 break;
506#endif
507
9641458d 508 case PNS_PEP_CTRL_REQ:
2e2fb4b3
RDC		 509 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
510 atomic_inc(&sk->sk_drops);
c41bd97f 511 break;
2e2fb4b3 512 }
c41bd97f
RDC		 513 __skb_pull(skb, 4);
514 queue = &pn->ctrlreq_queue;
515 goto queue;
9641458d 516
fc6a1107
RDC		 517 case PNS_PIPE_ALIGNED_DATA:
518 __skb_pull(skb, 1);
519 /* fall through */
9641458d
RDC		 520 case PNS_PIPE_DATA:
521 __skb_pull(skb, 3); /* Pipe data header */
522 if (!pn_flow_safe(pn->rx_fc)) {
523 err = sock_queue_rcv_skb(sk, skb);
524 if (!err)
525 return 0;
526 break;
527 }
528
529 if (pn->rx_credits == 0) {
2e2fb4b3 530 atomic_inc(&sk->sk_drops);
9641458d
RDC		 531 err = -ENOBUFS;
532 break;
533 }
534 pn->rx_credits--;
c41bd97f
RDC		 535 queue = &sk->sk_receive_queue;
536 goto queue;
9641458d
RDC		 537
538 case PNS_PEP_STATUS_IND:
539 pipe_rcv_status(sk, skb);
540 break;
541
542 case PNS_PIPE_REDIRECTED_IND:
543 err = pipe_rcv_created(sk, skb);
544 break;
545
546 case PNS_PIPE_CREATED_IND:
547 err = pipe_rcv_created(sk, skb);
548 if (err)
549 break;
550 /* fall through */
551 case PNS_PIPE_RESET_IND:
552 if (!pn->init_enable)
553 break;
554 /* fall through */
555 case PNS_PIPE_ENABLED_IND:
556 if (!pn_flow_safe(pn->tx_fc)) {
be677730 557 atomic_set(&pn->tx_credits, 1);
9641458d
RDC		 558 sk->sk_write_space(sk);
559 }
560 if (sk->sk_state == TCP_ESTABLISHED)
561 break; /* Nothing to do */
562 sk->sk_state = TCP_ESTABLISHED;
563 pipe_grant_credits(sk);
564 break;
565
566 case PNS_PIPE_DISABLED_IND:
567 sk->sk_state = TCP_SYN_RECV;
568 pn->rx_credits = 0;
569 break;
570
571 default:
572 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
573 hdr->message_id);
574 err = -EINVAL;
575 }
576out:
577 kfree_skb(skb);
578 return err;
c41bd97f
RDC		 579
580queue:
581 skb->dev = NULL;
582 skb_set_owner_r(skb, sk);
583 err = skb->len;
584 skb_queue_tail(queue, skb);
585 if (!sock_flag(sk, SOCK_DEAD))
586 sk->sk_data_ready(sk, err);
587 return 0;
9641458d
RDC		 588}
589
590/* Destroy connected sock. */
591static void pipe_destruct(struct sock *sk)
592{
c41bd97f
RDC		 593 struct pep_sock *pn = pep_sk(sk);
594
9641458d 595 skb_queue_purge(&sk->sk_receive_queue);
c41bd97f 596 skb_queue_purge(&pn->ctrlreq_queue);
9641458d
RDC		 597}
598
b3d62553 599#ifdef CONFIG_PHONET_PIPECTRLR
8f44fcc7
RDC		 600static u8 pipe_negotiate_fc(const u8 *fcs, unsigned n)
601{
602 unsigned i;
603 u8 final_fc = PN_NO_FLOW_CONTROL;
604
605 for (i = 0; i < n; i++) {
606 u8 fc = fcs[i];
607
608 if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL)
609 final_fc = fc;
610 }
611 return final_fc;
612}
613
b3d62553
KS		 614static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
615{
616 struct pep_sock *pn = pep_sk(sk);
8f44fcc7
RDC		 617 struct pnpipehdr *hdr;
618 u8 n_sb;
619
620 if (!pskb_pull(skb, sizeof(*hdr) + 4))
621 return -EINVAL;
622
623 hdr = pnp_hdr(skb);
624
625 /* Parse sub-blocks */
626 n_sb = hdr->data[4];
627 while (n_sb > 0) {
628 u8 type, buf[6], len = sizeof(buf);
629 const u8 *data = pep_get_sb(skb, &type, &len, buf);
630
631 if (data == NULL)
632 return -EINVAL;
633
634 switch (type) {
635 case PN_PIPE_SB_REQUIRED_FC_TX:
636 if (len < 2 || len < data[0])
637 break;
638 pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2);
639 break;
640
641 case PN_PIPE_SB_PREFERRED_FC_RX:
642 if (len < 2 || len < data[0])
643 break;
644 pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2);
645 break;
646
647 }
648 n_sb--;
649 }
b3d62553 650
b3d62553
KS		 651 sk->sk_state = TCP_SYN_RECV;
652 sk->sk_backlog_rcv = pipe_do_rcv;
653 sk->sk_destruct = pipe_destruct;
654 pn->rx_credits = 0;
b3d62553
KS		 655 sk->sk_state_change(sk);
656
0165d69b 657 return pipe_handler_send_created_ind(sk, PNS_PIPE_CREATED_IND);
b3d62553
KS		 658}
659#endif
660
9641458d
RDC		 661static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
662{
663 struct sock *newsk;
664 struct pep_sock *newpn, *pn = pep_sk(sk);
665 struct pnpipehdr *hdr;
14ba8fae 666 struct sockaddr_pn dst, src;
9641458d
RDC		 667 u16 peer_type;
668 u8 pipe_handle, enabled, n_sb;
fea93ece 669 u8 aligned = 0;
9641458d
RDC		 670
671 if (!pskb_pull(skb, sizeof(*hdr) + 4))
672 return -EINVAL;
673
674 hdr = pnp_hdr(skb);
675 pipe_handle = hdr->pipe_handle;
676 switch (hdr->state_after_connect) {
677 case PN_PIPE_DISABLE:
678 enabled = 0;
679 break;
680 case PN_PIPE_ENABLE:
681 enabled = 1;
682 break;
683 default:
684 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
685 return -EINVAL;
686 }
687 peer_type = hdr->other_pep_type << 8;
688
689 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
690 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
691 return -ENOBUFS;
692 }
693
694 /* Parse sub-blocks (options) */
695 n_sb = hdr->data[4];
696 while (n_sb > 0) {
697 u8 type, buf[1], len = sizeof(buf);
698 const u8 *data = pep_get_sb(skb, &type, &len, buf);
699
700 if (data == NULL)
701 return -EINVAL;
702 switch (type) {
703 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
704 if (len < 1)
705 return -EINVAL;
706 peer_type = (peer_type & 0xff00) | data[0];
707 break;
fea93ece
RDC		 708 case PN_PIPE_SB_ALIGNED_DATA:
709 aligned = data[0] != 0;
710 break;
9641458d
RDC		 711 }
712 n_sb--;
713 }
714
715 skb = skb_clone(skb, GFP_ATOMIC);
716 if (!skb)
717 return -ENOMEM;
718
719 /* Create a new to-be-accepted sock */
720 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
721 if (!newsk) {
722 kfree_skb(skb);
723 return -ENOMEM;
724 }
725 sock_init_data(NULL, newsk);
726 newsk->sk_state = TCP_SYN_RECV;
727 newsk->sk_backlog_rcv = pipe_do_rcv;
728 newsk->sk_protocol = sk->sk_protocol;
729 newsk->sk_destruct = pipe_destruct;
730
731 newpn = pep_sk(newsk);
732 pn_skb_get_dst_sockaddr(skb, &dst);
14ba8fae 733 pn_skb_get_src_sockaddr(skb, &src);
9641458d 734 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
14ba8fae
RDC		 735 newpn->pn_sk.dobject = pn_sockaddr_get_object(&src);
736 newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst);
c41bd97f 737 skb_queue_head_init(&newpn->ctrlreq_queue);
9641458d 738 newpn->pipe_handle = pipe_handle;
be677730 739 atomic_set(&newpn->tx_credits, 0);
9641458d 740 newpn->peer_type = peer_type;
be677730 741 newpn->rx_credits = 0;
9641458d
RDC		 742 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
743 newpn->init_enable = enabled;
fea93ece 744 newpn->aligned = aligned;
9641458d
RDC		 745
746 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
747 skb_queue_head(&newsk->sk_receive_queue, skb);
748 if (!sock_flag(sk, SOCK_DEAD))
749 sk->sk_data_ready(sk, 0);
750
751 sk_acceptq_added(sk);
752 sk_add_node(newsk, &pn->ackq);
753 return 0;
754}
755
756/* Listening sock must be locked */
757static struct sock *pep_find_pipe(const struct hlist_head *hlist,
758 const struct sockaddr_pn *dst,
759 u8 pipe_handle)
760{
761 struct hlist_node *node;
762 struct sock *sknode;
763 u16 dobj = pn_sockaddr_get_object(dst);
764
765 sk_for_each(sknode, node, hlist) {
766 struct pep_sock *pnnode = pep_sk(sknode);
767
768 /* Ports match, but addresses might not: */
769 if (pnnode->pn_sk.sobject != dobj)
770 continue;
771 if (pnnode->pipe_handle != pipe_handle)
772 continue;
773 if (sknode->sk_state == TCP_CLOSE_WAIT)
774 continue;
775
776 sock_hold(sknode);
777 return sknode;
778 }
779 return NULL;
780}
781
782/*
783 * Deliver an skb to a listening sock.
784 * Socket lock must be held.
785 * We then queue the skb to the right connected sock (if any).
786 */
787static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
788{
789 struct pep_sock *pn = pep_sk(sk);
790 struct sock *sknode;
2ddc1ac1 791 struct pnpipehdr *hdr;
9641458d
RDC		 792 struct sockaddr_pn dst;
793 int err = NET_RX_SUCCESS;
794 u8 pipe_handle;
795
796 if (!pskb_may_pull(skb, sizeof(*hdr)))
797 goto drop;
798
799 hdr = pnp_hdr(skb);
800 pipe_handle = hdr->pipe_handle;
801 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
802 goto drop;
803
804 pn_skb_get_dst_sockaddr(skb, &dst);
805
806 /* Look for an existing pipe handle */
807 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
808 if (sknode)
809 return sk_receive_skb(sknode, skb, 1);
810
811 /* Look for a pipe handle pending accept */
812 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
813 if (sknode) {
814 sock_put(sknode);
815 if (net_ratelimit())
816 printk(KERN_WARNING"Phonet unconnected PEP ignored");
817 err = NET_RX_DROP;
818 goto drop;
819 }
820
821 switch (hdr->message_id) {
822 case PNS_PEP_CONNECT_REQ:
823 err = pep_connreq_rcv(sk, skb);
824 break;
825
b3d62553
KS		 826#ifdef CONFIG_PHONET_PIPECTRLR
827 case PNS_PEP_CONNECT_RESP:
828 err = pep_connresp_rcv(sk, skb);
829 break;
830#endif
831
9641458d
RDC		 832 case PNS_PEP_DISCONNECT_REQ:
833 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
834 break;
835
836 case PNS_PEP_CTRL_REQ:
c41bd97f 837 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
9641458d
RDC		 838 break;
839
840 case PNS_PEP_RESET_REQ:
841 case PNS_PEP_ENABLE_REQ:
842 case PNS_PEP_DISABLE_REQ:
843 /* invalid handle is not even allowed here! */
844 default:
845 err = NET_RX_DROP;
846 }
847drop:
848 kfree_skb(skb);
849 return err;
850}
851
00497135 852#ifndef CONFIG_PHONET_PIPECTRLR
6482f554
RDC		 853static int pipe_do_remove(struct sock *sk)
854{
855 struct pep_sock *pn = pep_sk(sk);
856 struct pnpipehdr *ph;
857 struct sk_buff *skb;
858
859 skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL);
860 if (!skb)
861 return -ENOMEM;
862
863 skb_reserve(skb, MAX_PNPIPE_HEADER);
864 __skb_push(skb, sizeof(*ph));
865 skb_reset_transport_header(skb);
866 ph = pnp_hdr(skb);
867 ph->utid = 0;
868 ph->message_id = PNS_PIPE_REMOVE_REQ;
869 ph->pipe_handle = pn->pipe_handle;
870 ph->data[0] = PAD;
871
14ba8fae 872 return pn_skb_send(sk, skb, NULL);
6482f554 873}
00497135 874#endif
6482f554 875
9641458d
RDC		 876/* associated socket ceases to exist */
877static void pep_sock_close(struct sock *sk, long timeout)
878{
879 struct pep_sock *pn = pep_sk(sk);
02a47617 880 int ifindex = 0;
9641458d 881
e513480e 882 sock_hold(sk); /* keep a reference after sk_common_release() */
9641458d
RDC		 883 sk_common_release(sk);
884
885 lock_sock(sk);
886 if (sk->sk_state == TCP_LISTEN) {
887 /* Destroy the listen queue */
888 struct sock *sknode;
889 struct hlist_node *p, *n;
890
891 sk_for_each_safe(sknode, p, n, &pn->ackq)
892 sk_del_node_init(sknode);
893 sk->sk_state = TCP_CLOSE;
2feb6181
RDC		 894 } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) {
895#ifndef CONFIG_PHONET_PIPECTRLR
6482f554
RDC		 896 /* Forcefully remove dangling Phonet pipe */
897 pipe_do_remove(sk);
2feb6181 898#else
b3d62553 899 /* send pep disconnect request */
0165d69b 900 pipe_handler_send_req(sk, PNS_PEP_DISCONNECT_REQ, GFP_KERNEL);
b3d62553 901 sk->sk_state = TCP_CLOSE;
b3d62553 902#endif
2feb6181 903 }
b3d62553 904
02a47617
RDC		 905 ifindex = pn->ifindex;
906 pn->ifindex = 0;
9641458d 907 release_sock(sk);
02a47617
RDC		 908
909 if (ifindex)
910 gprs_detach(sk);
e513480e 911 sock_put(sk);
9641458d
RDC		 912}
913
914static int pep_wait_connreq(struct sock *sk, int noblock)
915{
916 struct task_struct *tsk = current;
917 struct pep_sock *pn = pep_sk(sk);
918 long timeo = sock_rcvtimeo(sk, noblock);
919
920 for (;;) {
921 DEFINE_WAIT(wait);
922
923 if (sk->sk_state != TCP_LISTEN)
924 return -EINVAL;
925 if (!hlist_empty(&pn->ackq))
926 break;
927 if (!timeo)
928 return -EWOULDBLOCK;
929 if (signal_pending(tsk))
930 return sock_intr_errno(timeo);
931
43815482 932 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
9641458d
RDC		 933 TASK_INTERRUPTIBLE);
934 release_sock(sk);
935 timeo = schedule_timeout(timeo);
936 lock_sock(sk);
43815482 937 finish_wait(sk_sleep(sk), &wait);
9641458d
RDC		 938 }
939
940 return 0;
941}
942
943static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
944{
945 struct pep_sock *pn = pep_sk(sk);
946 struct sock *newsk = NULL;
947 struct sk_buff *oskb;
948 int err;
949
950 lock_sock(sk);
951 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
952 if (err)
953 goto out;
954
955 newsk = __sk_head(&pn->ackq);
956
957 oskb = skb_dequeue(&newsk->sk_receive_queue);
958 err = pep_accept_conn(newsk, oskb);
959 if (err) {
960 skb_queue_head(&newsk->sk_receive_queue, oskb);
961 newsk = NULL;
962 goto out;
963 }
635f0815 964 kfree_skb(oskb);
9641458d
RDC		 965
966 sock_hold(sk);
967 pep_sk(newsk)->listener = sk;
968
969 sock_hold(newsk);
970 sk_del_node_init(newsk);
971 sk_acceptq_removed(sk);
972 sk_add_node(newsk, &pn->hlist);
973 __sock_put(newsk);
974
975out:
976 release_sock(sk);
977 *errp = err;
978 return newsk;
979}
980
b3d62553
KS		 981#ifdef CONFIG_PHONET_PIPECTRLR
982static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
983{
984 struct pep_sock *pn = pep_sk(sk);
14ba8fae 985 const struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
b3d62553 986
14ba8fae
RDC		 987 pn->pn_sk.dobject = pn_sockaddr_get_object(spn);
988 pn->pn_sk.resource = pn_sockaddr_get_resource(spn);
0165d69b 989 return pipe_handler_send_req(sk, PNS_PEP_CONNECT_REQ, GFP_KERNEL);
b3d62553
KS		 990}
991#endif
992
9641458d
RDC		 993static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
994{
c41bd97f 995 struct pep_sock *pn = pep_sk(sk);
9641458d
RDC		 996 int answ;
997
998 switch (cmd) {
999 case SIOCINQ:
1000 if (sk->sk_state == TCP_LISTEN)
1001 return -EINVAL;
1002
1003 lock_sock(sk);
f64f9e71
JP		 1004 if (sock_flag(sk, SOCK_URGINLINE) &&
1005 !skb_queue_empty(&pn->ctrlreq_queue))
c41bd97f
RDC		 1006 answ = skb_peek(&pn->ctrlreq_queue)->len;
1007 else if (!skb_queue_empty(&sk->sk_receive_queue))
9641458d
RDC		 1008 answ = skb_peek(&sk->sk_receive_queue)->len;
1009 else
1010 answ = 0;
1011 release_sock(sk);
1012 return put_user(answ, (int __user *)arg);
1013 }
1014
1015 return -ENOIOCTLCMD;
1016}
1017
1018static int pep_init(struct sock *sk)
1019{
1020 struct pep_sock *pn = pep_sk(sk);
1021
1022 INIT_HLIST_HEAD(&pn->ackq);
1023 INIT_HLIST_HEAD(&pn->hlist);
c41bd97f 1024 skb_queue_head_init(&pn->ctrlreq_queue);
9641458d
RDC		 1025 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
1026 return 0;
1027}
1028
02a47617 1029static int pep_setsockopt(struct sock *sk, int level, int optname,
b7058842 1030 char __user *optval, unsigned int optlen)
02a47617
RDC		 1031{
1032 struct pep_sock *pn = pep_sk(sk);
1033 int val = 0, err = 0;
1034
1035 if (level != SOL_PNPIPE)
1036 return -ENOPROTOOPT;
1037 if (optlen >= sizeof(int)) {
1038 if (get_user(val, (int __user *) optval))
1039 return -EFAULT;
1040 }
1041
1042 lock_sock(sk);
1043 switch (optname) {
8d98efa8 1044#ifdef CONFIG_PHONET_PIPECTRLR
b3d62553 1045 case PNPIPE_PIPE_HANDLE:
8d98efa8 1046 if (val) {
b3d62553 1047 pn->pipe_handle = val;
8d98efa8
KS		 1048 break;
1049 }
8d98efa8
KS		 1050#endif
1051
02a47617
RDC		 1052 case PNPIPE_ENCAP:
1053 if (val && val != PNPIPE_ENCAP_IP) {
1054 err = -EINVAL;
1055 break;
1056 }
1057 if (!pn->ifindex == !val)
1058 break; /* Nothing to do! */
1059 if (!capable(CAP_NET_ADMIN)) {
1060 err = -EPERM;
1061 break;
1062 }
1063 if (val) {
1064 release_sock(sk);
1065 err = gprs_attach(sk);
1066 if (err > 0) {
1067 pn->ifindex = err;
1068 err = 0;
1069 }
1070 } else {
1071 pn->ifindex = 0;
1072 release_sock(sk);
1073 gprs_detach(sk);
1074 err = 0;
1075 }
1076 goto out_norel;
03789f26
RDC		 1077
1078#ifdef CONFIG_PHONET_PIPECTRLR
1079 case PNPIPE_ENABLE:
2feb6181 1080 if ((1 << sk->sk_state) & ~(TCPF_SYN_RECV|TCPF_ESTABLISHED)) {
03789f26
RDC		 1081 err = -ENOTCONN;
1082 break;
1083 }
1084 err = pipe_handler_enable_pipe(sk, val);
1085 break;
1086#endif
1087
02a47617
RDC		 1088 default:
1089 err = -ENOPROTOOPT;
1090 }
1091 release_sock(sk);
1092
1093out_norel:
1094 return err;
1095}
1096
1097static int pep_getsockopt(struct sock *sk, int level, int optname,
1098 char __user *optval, int __user *optlen)
1099{
1100 struct pep_sock *pn = pep_sk(sk);
1101 int len, val;
1102
1103 if (level != SOL_PNPIPE)
1104 return -ENOPROTOOPT;
1105 if (get_user(len, optlen))
1106 return -EFAULT;
1107
1108 switch (optname) {
1109 case PNPIPE_ENCAP:
1110 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1111 break;
8d98efa8 1112
03789f26
RDC		 1113 case PNPIPE_IFINDEX:
1114 val = pn->ifindex;
1115 break;
1116
8d98efa8 1117#ifdef CONFIG_PHONET_PIPECTRLR
03789f26 1118 case PNPIPE_ENABLE:
2feb6181 1119 val = sk->sk_state == TCP_ESTABLISHED;
8d98efa8
KS		 1120 break;
1121#endif
1122
02a47617
RDC		 1123 default:
1124 return -ENOPROTOOPT;
1125 }
1126
1127 len = min_t(unsigned int, sizeof(int), len);
1128 if (put_user(len, optlen))
1129 return -EFAULT;
1130 if (put_user(val, (int __user *) optval))
1131 return -EFAULT;
1132 return 0;
1133}
1134
1135static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1136{
1137 struct pep_sock *pn = pep_sk(sk);
1138 struct pnpipehdr *ph;
e1a5964f 1139 int err;
02a47617 1140
be677730
RDC		 1141 if (pn_flow_safe(pn->tx_fc) &&
1142 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1143 kfree_skb(skb);
1144 return -ENOBUFS;
1145 }
1146
fea93ece 1147 skb_push(skb, 3 + pn->aligned);
02a47617
RDC		 1148 skb_reset_transport_header(skb);
1149 ph = pnp_hdr(skb);
1150 ph->utid = 0;
fea93ece
RDC		 1151 if (pn->aligned) {
1152 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1153 ph->data[0] = 0; /* padding */
1154 } else
1155 ph->message_id = PNS_PIPE_DATA;
02a47617 1156 ph->pipe_handle = pn->pipe_handle;
14ba8fae 1157 err = pn_skb_send(sk, skb, NULL);
e1a5964f
RDC		 1158
1159 if (err && pn_flow_safe(pn->tx_fc))
1160 atomic_inc(&pn->tx_credits);
1161 return err;
1162
02a47617
RDC		 1163}
1164
9641458d
RDC		 1165static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
1166 struct msghdr *msg, size_t len)
1167{
1168 struct pep_sock *pn = pep_sk(sk);
b1704374 1169 struct sk_buff *skb;
9641458d
RDC		 1170 long timeo;
1171 int flags = msg->msg_flags;
1172 int err, done;
1173
82ecbcb9
RDC		 1174 if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1175 MSG_CMSG_COMPAT)) ||
1176 !(msg->msg_flags & MSG_EOR))
9641458d
RDC		 1177 return -EOPNOTSUPP;
1178
b1704374
RDC		 1179 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1180 flags & MSG_DONTWAIT, &err);
1181 if (!skb)
02ac3268 1182 return err;
b1704374
RDC		 1183
1184 skb_reserve(skb, MAX_PHONET_HEADER + 3);
1185 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1186 if (err < 0)
1187 goto outfree;
1188
9641458d
RDC		 1189 lock_sock(sk);
1190 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1191 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1192 err = -ENOTCONN;
1193 goto out;
1194 }
1195 if (sk->sk_state != TCP_ESTABLISHED) {
1196 /* Wait until the pipe gets to enabled state */
1197disabled:
1198 err = sk_stream_wait_connect(sk, &timeo);
1199 if (err)
1200 goto out;
1201
1202 if (sk->sk_state == TCP_CLOSE_WAIT) {
1203 err = -ECONNRESET;
1204 goto out;
1205 }
1206 }
1207 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1208
1209 /* Wait until flow control allows TX */
be677730 1210 done = atomic_read(&pn->tx_credits);
9641458d
RDC		 1211 while (!done) {
1212 DEFINE_WAIT(wait);
1213
1214 if (!timeo) {
1215 err = -EAGAIN;
1216 goto out;
1217 }
1218 if (signal_pending(current)) {
1219 err = sock_intr_errno(timeo);
1220 goto out;
1221 }
1222
43815482 1223 prepare_to_wait(sk_sleep(sk), &wait,
9641458d 1224 TASK_INTERRUPTIBLE);
be677730 1225 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
43815482 1226 finish_wait(sk_sleep(sk), &wait);
9641458d
RDC		 1227
1228 if (sk->sk_state != TCP_ESTABLISHED)
1229 goto disabled;
1230 }
1231
02a47617 1232 err = pipe_skb_send(sk, skb);
9641458d
RDC		 1233 if (err >= 0)
1234 err = len; /* success! */
1235 skb = NULL;
1236out:
1237 release_sock(sk);
b1704374 1238outfree:
9641458d
RDC		 1239 kfree_skb(skb);
1240 return err;
1241}
1242
02a47617
RDC		 1243int pep_writeable(struct sock *sk)
1244{
1245 struct pep_sock *pn = pep_sk(sk);
1246
be677730 1247 return atomic_read(&pn->tx_credits);
02a47617
RDC		 1248}
1249
1250int pep_write(struct sock *sk, struct sk_buff *skb)
1251{
1252 struct sk_buff *rskb, *fs;
1253 int flen = 0;
1254
fea93ece
RDC		 1255 if (pep_sk(sk)->aligned)
1256 return pipe_skb_send(sk, skb);
1257
02a47617
RDC		 1258 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1259 if (!rskb) {
1260 kfree_skb(skb);
1261 return -ENOMEM;
1262 }
1263 skb_shinfo(rskb)->frag_list = skb;
1264 rskb->len += skb->len;
1265 rskb->data_len += rskb->len;
1266 rskb->truesize += rskb->len;
1267
1268 /* Avoid nested fragments */
5c313e9a 1269 skb_walk_frags(skb, fs)
02a47617
RDC		 1270 flen += fs->len;
1271 skb->next = skb_shinfo(skb)->frag_list;
5c313e9a 1272 skb_frag_list_init(skb);
02a47617
RDC		 1273 skb->len -= flen;
1274 skb->data_len -= flen;
1275 skb->truesize -= flen;
1276
1277 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1278 return pipe_skb_send(sk, rskb);
1279}
1280
1281struct sk_buff *pep_read(struct sock *sk)
1282{
1283 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1284
1285 if (sk->sk_state == TCP_ESTABLISHED)
1286 pipe_grant_credits(sk);
1287 return skb;
1288}
1289
9641458d
RDC		 1290static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
1291 struct msghdr *msg, size_t len, int noblock,
1292 int flags, int *addr_len)
1293{
1294 struct sk_buff *skb;
1295 int err;
1296
82ecbcb9
RDC		 1297 if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1298 MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1299 return -EOPNOTSUPP;
1300
9641458d
RDC		 1301 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1302 return -ENOTCONN;
1303
c41bd97f
RDC		 1304 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1305 /* Dequeue and acknowledge control request */
1306 struct pep_sock *pn = pep_sk(sk);
1307
82ecbcb9
RDC		 1308 if (flags & MSG_PEEK)
1309 return -EOPNOTSUPP;
c41bd97f
RDC		 1310 skb = skb_dequeue(&pn->ctrlreq_queue);
1311 if (skb) {
1312 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1313 GFP_KERNEL);
1314 msg->msg_flags |= MSG_OOB;
1315 goto copy;
1316 }
1317 if (flags & MSG_OOB)
1318 return -EINVAL;
1319 }
1320
9641458d
RDC		 1321 skb = skb_recv_datagram(sk, flags, noblock, &err);
1322 lock_sock(sk);
1323 if (skb == NULL) {
1324 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1325 err = -ECONNRESET;
1326 release_sock(sk);
1327 return err;
1328 }
1329
1330 if (sk->sk_state == TCP_ESTABLISHED)
1331 pipe_grant_credits(sk);
1332 release_sock(sk);
c41bd97f 1333copy:
9641458d 1334 msg->msg_flags |= MSG_EOR;
9641458d
RDC		 1335 if (skb->len > len)
1336 msg->msg_flags |= MSG_TRUNC;
1337 else
1338 len = skb->len;
1339
1340 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1341 if (!err)
1342 err = (flags & MSG_TRUNC) ? skb->len : len;
1343
1344 skb_free_datagram(sk, skb);
1345 return err;
1346}
1347
1348static void pep_sock_unhash(struct sock *sk)
1349{
1350 struct pep_sock *pn = pep_sk(sk);
1351 struct sock *skparent = NULL;
1352
1353 lock_sock(sk);
b3d62553
KS		 1354
1355#ifndef CONFIG_PHONET_PIPECTRLR
9641458d
RDC		 1356 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1357 skparent = pn->listener;
9641458d
RDC		 1358 release_sock(sk);
1359
9641458d 1360 pn = pep_sk(skparent);
7dfde179
RDC		 1361 lock_sock(skparent);
1362 sk_del_node_init(sk);
1363 sk = skparent;
9641458d 1364 }
b3d62553 1365#endif
9641458d
RDC		 1366 /* Unhash a listening sock only when it is closed
1367 * and all of its active connected pipes are closed. */
1368 if (hlist_empty(&pn->hlist))
1369 pn_sock_unhash(&pn->pn_sk.sk);
1370 release_sock(sk);
1371
1372 if (skparent)
1373 sock_put(skparent);
1374}
1375
1376static struct proto pep_proto = {
1377 .close = pep_sock_close,
1378 .accept = pep_sock_accept,
b3d62553
KS		 1379#ifdef CONFIG_PHONET_PIPECTRLR
1380 .connect = pep_sock_connect,
1381#endif
9641458d
RDC		 1382 .ioctl = pep_ioctl,
1383 .init = pep_init,
02a47617
RDC		 1384 .setsockopt = pep_setsockopt,
1385 .getsockopt = pep_getsockopt,
9641458d
RDC		 1386 .sendmsg = pep_sendmsg,
1387 .recvmsg = pep_recvmsg,
1388 .backlog_rcv = pep_do_rcv,
1389 .hash = pn_sock_hash,
1390 .unhash = pep_sock_unhash,
1391 .get_port = pn_sock_get_port,
1392 .obj_size = sizeof(struct pep_sock),
1393 .owner = THIS_MODULE,
1394 .name = "PNPIPE",
1395};
1396
1397static struct phonet_protocol pep_pn_proto = {
1398 .ops = &phonet_stream_ops,
1399 .prot = &pep_proto,
1400 .sock_type = SOCK_SEQPACKET,
1401};
1402
1403static int __init pep_register(void)
1404{
1405 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1406}
1407
1408static void __exit pep_unregister(void)
1409{
1410 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1411}
1412
1413module_init(pep_register);
1414module_exit(pep_unregister);
1415MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1416MODULE_DESCRIPTION("Phonet pipe protocol");
1417MODULE_LICENSE("GPL");
1418MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
Linux kernel - Deliverables
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