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NFSv4.1: Fix a request leak on the back channel
[linux/fpc-iii.git] / net / phonet / pep.c
blob007546ddca01952903dcc57ab1f1f3194308ec09
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 <linux/module.h>
34 #include <net/phonet/phonet.h>
35 #include <net/phonet/pep.h>
36 #include <net/phonet/gprs.h>
37
38 /* sk_state values:
39 * TCP_CLOSE sock not in use yet
40 * TCP_CLOSE_WAIT disconnected pipe
41 * TCP_LISTEN listening pipe endpoint
42 * TCP_SYN_RECV connected pipe in disabled state
43 * TCP_ESTABLISHED connected pipe in enabled state
44 *
45 * pep_sock locking:
46 * - sk_state, hlist: sock lock needed
47 * - listener: read only
48 * - pipe_handle: read only
49 */
50
51 #define CREDITS_MAX 10
52 #define CREDITS_THR 7
53
54 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
55
56 /* Get the next TLV sub-block. */
57 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
58 void *buf)
59 {
60 void *data = NULL;
61 struct {
62 u8 sb_type;
63 u8 sb_len;
64 } *ph, h;
65 int buflen = *plen;
66
67 ph = skb_header_pointer(skb, 0, 2, &h);
68 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
69 return NULL;
70 ph->sb_len -= 2;
71 *ptype = ph->sb_type;
72 *plen = ph->sb_len;
73
74 if (buflen > ph->sb_len)
75 buflen = ph->sb_len;
76 data = skb_header_pointer(skb, 2, buflen, buf);
77 __skb_pull(skb, 2 + ph->sb_len);
78 return data;
79 }
80
81 static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
82 int len, gfp_t priority)
83 {
84 struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
85 if (!skb)
86 return NULL;
87 skb_set_owner_w(skb, sk);
88
89 skb_reserve(skb, MAX_PNPIPE_HEADER);
90 __skb_put(skb, len);
91 skb_copy_to_linear_data(skb, payload, len);
92 __skb_push(skb, sizeof(struct pnpipehdr));
93 skb_reset_transport_header(skb);
94 return skb;
95 }
96
97 static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code,
98 const void *data, int len, gfp_t priority)
99 {
100 const struct pnpipehdr *oph = pnp_hdr(oskb);
101 struct pnpipehdr *ph;
102 struct sk_buff *skb;
103 struct sockaddr_pn peer;
104
105 skb = pep_alloc_skb(sk, data, len, priority);
106 if (!skb)
107 return -ENOMEM;
108
109 ph = pnp_hdr(skb);
110 ph->utid = oph->utid;
111 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
112 ph->pipe_handle = oph->pipe_handle;
113 ph->error_code = code;
114
115 pn_skb_get_src_sockaddr(oskb, &peer);
116 return pn_skb_send(sk, skb, &peer);
117 }
118
119 static int pep_indicate(struct sock *sk, u8 id, u8 code,
120 const void *data, int len, gfp_t priority)
121 {
122 struct pep_sock *pn = pep_sk(sk);
123 struct pnpipehdr *ph;
124 struct sk_buff *skb;
125
126 skb = pep_alloc_skb(sk, data, len, priority);
127 if (!skb)
128 return -ENOMEM;
129
130 ph = pnp_hdr(skb);
131 ph->utid = 0;
132 ph->message_id = id;
133 ph->pipe_handle = pn->pipe_handle;
134 ph->data[0] = code;
135 return pn_skb_send(sk, skb, NULL);
136 }
137
138 #define PAD 0x00
139
140 static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
141 const void *data, int len)
142 {
143 struct pep_sock *pn = pep_sk(sk);
144 struct pnpipehdr *ph;
145 struct sk_buff *skb;
146
147 skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
148 if (!skb)
149 return -ENOMEM;
150
151 ph = pnp_hdr(skb);
152 ph->utid = id; /* whatever */
153 ph->message_id = id;
154 ph->pipe_handle = pn->pipe_handle;
155 ph->data[0] = code;
156 return pn_skb_send(sk, skb, NULL);
157 }
158
159 static int pipe_handler_send_created_ind(struct sock *sk)
160 {
161 struct pep_sock *pn = pep_sk(sk);
162 u8 data[4] = {
163 PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
164 pn->tx_fc, pn->rx_fc,
165 };
166
167 return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
168 data, 4, GFP_ATOMIC);
169 }
170
171 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
172 {
173 static const u8 data[20] = {
174 PAD, PAD, PAD, 2 /* sub-blocks */,
175 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
176 PN_MULTI_CREDIT_FLOW_CONTROL,
177 PN_ONE_CREDIT_FLOW_CONTROL,
178 PN_LEGACY_FLOW_CONTROL,
179 PAD,
180 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
181 PN_MULTI_CREDIT_FLOW_CONTROL,
182 PN_ONE_CREDIT_FLOW_CONTROL,
183 PN_LEGACY_FLOW_CONTROL,
184 PAD,
185 };
186
187 might_sleep();
188 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
189 GFP_KERNEL);
190 }
191
192 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code,
193 gfp_t priority)
194 {
195 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
196 WARN_ON(code == PN_PIPE_NO_ERROR);
197 return pep_reply(sk, skb, code, data, sizeof(data), priority);
198 }
199
200 /* Control requests are not sent by the pipe service and have a specific
201 * message format. */
202 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
203 gfp_t priority)
204 {
205 const struct pnpipehdr *oph = pnp_hdr(oskb);
206 struct sk_buff *skb;
207 struct pnpipehdr *ph;
208 struct sockaddr_pn dst;
209 u8 data[4] = {
210 oph->data[0], /* PEP type */
211 code, /* error code, at an unusual offset */
212 PAD, PAD,
213 };
214
215 skb = pep_alloc_skb(sk, data, 4, priority);
216 if (!skb)
217 return -ENOMEM;
218
219 ph = pnp_hdr(skb);
220 ph->utid = oph->utid;
221 ph->message_id = PNS_PEP_CTRL_RESP;
222 ph->pipe_handle = oph->pipe_handle;
223 ph->data[0] = oph->data[1]; /* CTRL id */
224
225 pn_skb_get_src_sockaddr(oskb, &dst);
226 return pn_skb_send(sk, skb, &dst);
227 }
228
229 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
230 {
231 u8 data[4] = { type, PAD, PAD, status };
232
233 return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
234 data, 4, priority);
235 }
236
237 /* Send our RX flow control information to the sender.
238 * Socket must be locked. */
239 static void pipe_grant_credits(struct sock *sk, gfp_t priority)
240 {
241 struct pep_sock *pn = pep_sk(sk);
242
243 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
244
245 switch (pn->rx_fc) {
246 case PN_LEGACY_FLOW_CONTROL: /* TODO */
247 break;
248 case PN_ONE_CREDIT_FLOW_CONTROL:
249 if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
250 PEP_IND_READY, priority) == 0)
251 pn->rx_credits = 1;
252 break;
253 case PN_MULTI_CREDIT_FLOW_CONTROL:
254 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
255 break;
256 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
257 CREDITS_MAX - pn->rx_credits,
258 priority) == 0)
259 pn->rx_credits = CREDITS_MAX;
260 break;
261 }
262 }
263
264 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
265 {
266 struct pep_sock *pn = pep_sk(sk);
267 struct pnpipehdr *hdr;
268 int wake = 0;
269
270 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
271 return -EINVAL;
272
273 hdr = pnp_hdr(skb);
274 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
275 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
276 (unsigned)hdr->data[0]);
277 return -EOPNOTSUPP;
278 }
279
280 switch (hdr->data[1]) {
281 case PN_PEP_IND_FLOW_CONTROL:
282 switch (pn->tx_fc) {
283 case PN_LEGACY_FLOW_CONTROL:
284 switch (hdr->data[4]) {
285 case PEP_IND_BUSY:
286 atomic_set(&pn->tx_credits, 0);
287 break;
288 case PEP_IND_READY:
289 atomic_set(&pn->tx_credits, wake = 1);
290 break;
291 }
292 break;
293 case PN_ONE_CREDIT_FLOW_CONTROL:
294 if (hdr->data[4] == PEP_IND_READY)
295 atomic_set(&pn->tx_credits, wake = 1);
296 break;
297 }
298 break;
299
300 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
301 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
302 break;
303 atomic_add(wake = hdr->data[4], &pn->tx_credits);
304 break;
305
306 default:
307 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
308 (unsigned)hdr->data[1]);
309 return -EOPNOTSUPP;
310 }
311 if (wake)
312 sk->sk_write_space(sk);
313 return 0;
314 }
315
316 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
317 {
318 struct pep_sock *pn = pep_sk(sk);
319 struct pnpipehdr *hdr = pnp_hdr(skb);
320 u8 n_sb = hdr->data[0];
321
322 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
323 __skb_pull(skb, sizeof(*hdr));
324 while (n_sb > 0) {
325 u8 type, buf[2], len = sizeof(buf);
326 u8 *data = pep_get_sb(skb, &type, &len, buf);
327
328 if (data == NULL)
329 return -EINVAL;
330 switch (type) {
331 case PN_PIPE_SB_NEGOTIATED_FC:
332 if (len < 2 || (data[0] | data[1]) > 3)
333 break;
334 pn->tx_fc = data[0] & 3;
335 pn->rx_fc = data[1] & 3;
336 break;
337 }
338 n_sb--;
339 }
340 return 0;
341 }
342
343 /* Queue an skb to a connected sock.
344 * Socket lock must be held. */
345 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
346 {
347 struct pep_sock *pn = pep_sk(sk);
348 struct pnpipehdr *hdr = pnp_hdr(skb);
349 struct sk_buff_head *queue;
350 int err = 0;
351
352 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
353
354 switch (hdr->message_id) {
355 case PNS_PEP_CONNECT_REQ:
356 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_ATOMIC);
357 break;
358
359 case PNS_PEP_DISCONNECT_REQ:
360 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
361 sk->sk_state = TCP_CLOSE_WAIT;
362 if (!sock_flag(sk, SOCK_DEAD))
363 sk->sk_state_change(sk);
364 break;
365
366 case PNS_PEP_ENABLE_REQ:
367 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
368 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
369 break;
370
371 case PNS_PEP_RESET_REQ:
372 switch (hdr->state_after_reset) {
373 case PN_PIPE_DISABLE:
374 pn->init_enable = 0;
375 break;
376 case PN_PIPE_ENABLE:
377 pn->init_enable = 1;
378 break;
379 default: /* not allowed to send an error here!? */
380 err = -EINVAL;
381 goto out;
382 }
383 /* fall through */
384 case PNS_PEP_DISABLE_REQ:
385 atomic_set(&pn->tx_credits, 0);
386 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
387 break;
388
389 case PNS_PEP_CTRL_REQ:
390 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
391 atomic_inc(&sk->sk_drops);
392 break;
393 }
394 __skb_pull(skb, 4);
395 queue = &pn->ctrlreq_queue;
396 goto queue;
397
398 case PNS_PIPE_ALIGNED_DATA:
399 __skb_pull(skb, 1);
400 /* fall through */
401 case PNS_PIPE_DATA:
402 __skb_pull(skb, 3); /* Pipe data header */
403 if (!pn_flow_safe(pn->rx_fc)) {
404 err = sock_queue_rcv_skb(sk, skb);
405 if (!err)
406 return NET_RX_SUCCESS;
407 err = -ENOBUFS;
408 break;
409 }
410
411 if (pn->rx_credits == 0) {
412 atomic_inc(&sk->sk_drops);
413 err = -ENOBUFS;
414 break;
415 }
416 pn->rx_credits--;
417 queue = &sk->sk_receive_queue;
418 goto queue;
419
420 case PNS_PEP_STATUS_IND:
421 pipe_rcv_status(sk, skb);
422 break;
423
424 case PNS_PIPE_REDIRECTED_IND:
425 err = pipe_rcv_created(sk, skb);
426 break;
427
428 case PNS_PIPE_CREATED_IND:
429 err = pipe_rcv_created(sk, skb);
430 if (err)
431 break;
432 /* fall through */
433 case PNS_PIPE_RESET_IND:
434 if (!pn->init_enable)
435 break;
436 /* fall through */
437 case PNS_PIPE_ENABLED_IND:
438 if (!pn_flow_safe(pn->tx_fc)) {
439 atomic_set(&pn->tx_credits, 1);
440 sk->sk_write_space(sk);
441 }
442 if (sk->sk_state == TCP_ESTABLISHED)
443 break; /* Nothing to do */
444 sk->sk_state = TCP_ESTABLISHED;
445 pipe_grant_credits(sk, GFP_ATOMIC);
446 break;
447
448 case PNS_PIPE_DISABLED_IND:
449 sk->sk_state = TCP_SYN_RECV;
450 pn->rx_credits = 0;
451 break;
452
453 default:
454 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
455 hdr->message_id);
456 err = -EINVAL;
457 }
458 out:
459 kfree_skb(skb);
460 return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS;
461
462 queue:
463 skb->dev = NULL;
464 skb_set_owner_r(skb, sk);
465 err = skb->len;
466 skb_queue_tail(queue, skb);
467 if (!sock_flag(sk, SOCK_DEAD))
468 sk->sk_data_ready(sk, err);
469 return NET_RX_SUCCESS;
470 }
471
472 /* Destroy connected sock. */
473 static void pipe_destruct(struct sock *sk)
474 {
475 struct pep_sock *pn = pep_sk(sk);
476
477 skb_queue_purge(&sk->sk_receive_queue);
478 skb_queue_purge(&pn->ctrlreq_queue);
479 }
480
481 static u8 pipe_negotiate_fc(const u8 *fcs, unsigned n)
482 {
483 unsigned i;
484 u8 final_fc = PN_NO_FLOW_CONTROL;
485
486 for (i = 0; i < n; i++) {
487 u8 fc = fcs[i];
488
489 if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL)
490 final_fc = fc;
491 }
492 return final_fc;
493 }
494
495 static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
496 {
497 struct pep_sock *pn = pep_sk(sk);
498 struct pnpipehdr *hdr;
499 u8 n_sb;
500
501 if (!pskb_pull(skb, sizeof(*hdr) + 4))
502 return -EINVAL;
503
504 hdr = pnp_hdr(skb);
505 if (hdr->error_code != PN_PIPE_NO_ERROR)
506 return -ECONNREFUSED;
507
508 /* Parse sub-blocks */
509 n_sb = hdr->data[4];
510 while (n_sb > 0) {
511 u8 type, buf[6], len = sizeof(buf);
512 const u8 *data = pep_get_sb(skb, &type, &len, buf);
513
514 if (data == NULL)
515 return -EINVAL;
516
517 switch (type) {
518 case PN_PIPE_SB_REQUIRED_FC_TX:
519 if (len < 2 || len < data[0])
520 break;
521 pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2);
522 break;
523
524 case PN_PIPE_SB_PREFERRED_FC_RX:
525 if (len < 2 || len < data[0])
526 break;
527 pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2);
528 break;
529
530 }
531 n_sb--;
532 }
533
534 return pipe_handler_send_created_ind(sk);
535 }
536
537 /* Queue an skb to an actively connected sock.
538 * Socket lock must be held. */
539 static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb)
540 {
541 struct pep_sock *pn = pep_sk(sk);
542 struct pnpipehdr *hdr = pnp_hdr(skb);
543 int err = NET_RX_SUCCESS;
544
545 switch (hdr->message_id) {
546 case PNS_PIPE_ALIGNED_DATA:
547 __skb_pull(skb, 1);
548 /* fall through */
549 case PNS_PIPE_DATA:
550 __skb_pull(skb, 3); /* Pipe data header */
551 if (!pn_flow_safe(pn->rx_fc)) {
552 err = sock_queue_rcv_skb(sk, skb);
553 if (!err)
554 return NET_RX_SUCCESS;
555 err = NET_RX_DROP;
556 break;
557 }
558
559 if (pn->rx_credits == 0) {
560 atomic_inc(&sk->sk_drops);
561 err = NET_RX_DROP;
562 break;
563 }
564 pn->rx_credits--;
565 skb->dev = NULL;
566 skb_set_owner_r(skb, sk);
567 err = skb->len;
568 skb_queue_tail(&sk->sk_receive_queue, skb);
569 if (!sock_flag(sk, SOCK_DEAD))
570 sk->sk_data_ready(sk, err);
571 return NET_RX_SUCCESS;
572
573 case PNS_PEP_CONNECT_RESP:
574 if (sk->sk_state != TCP_SYN_SENT)
575 break;
576 if (!sock_flag(sk, SOCK_DEAD))
577 sk->sk_state_change(sk);
578 if (pep_connresp_rcv(sk, skb)) {
579 sk->sk_state = TCP_CLOSE_WAIT;
580 break;
581 }
582
583 sk->sk_state = TCP_ESTABLISHED;
584 if (!pn_flow_safe(pn->tx_fc)) {
585 atomic_set(&pn->tx_credits, 1);
586 sk->sk_write_space(sk);
587 }
588 pipe_grant_credits(sk, GFP_ATOMIC);
589 break;
590
591 case PNS_PEP_DISCONNECT_RESP:
592 /* sock should already be dead, nothing to do */
593 break;
594
595 case PNS_PEP_STATUS_IND:
596 pipe_rcv_status(sk, skb);
597 break;
598 }
599 kfree_skb(skb);
600 return err;
601 }
602
603 /* Listening sock must be locked */
604 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
605 const struct sockaddr_pn *dst,
606 u8 pipe_handle)
607 {
608 struct hlist_node *node;
609 struct sock *sknode;
610 u16 dobj = pn_sockaddr_get_object(dst);
611
612 sk_for_each(sknode, node, hlist) {
613 struct pep_sock *pnnode = pep_sk(sknode);
614
615 /* Ports match, but addresses might not: */
616 if (pnnode->pn_sk.sobject != dobj)
617 continue;
618 if (pnnode->pipe_handle != pipe_handle)
619 continue;
620 if (sknode->sk_state == TCP_CLOSE_WAIT)
621 continue;
622
623 sock_hold(sknode);
624 return sknode;
625 }
626 return NULL;
627 }
628
629 /*
630 * Deliver an skb to a listening sock.
631 * Socket lock must be held.
632 * We then queue the skb to the right connected sock (if any).
633 */
634 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
635 {
636 struct pep_sock *pn = pep_sk(sk);
637 struct sock *sknode;
638 struct pnpipehdr *hdr;
639 struct sockaddr_pn dst;
640 u8 pipe_handle;
641
642 if (!pskb_may_pull(skb, sizeof(*hdr)))
643 goto drop;
644
645 hdr = pnp_hdr(skb);
646 pipe_handle = hdr->pipe_handle;
647 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
648 goto drop;
649
650 pn_skb_get_dst_sockaddr(skb, &dst);
651
652 /* Look for an existing pipe handle */
653 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
654 if (sknode)
655 return sk_receive_skb(sknode, skb, 1);
656
657 switch (hdr->message_id) {
658 case PNS_PEP_CONNECT_REQ:
659 if (sk->sk_state != TCP_LISTEN || sk_acceptq_is_full(sk)) {
660 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE,
661 GFP_ATOMIC);
662 break;
663 }
664 skb_queue_head(&sk->sk_receive_queue, skb);
665 sk_acceptq_added(sk);
666 if (!sock_flag(sk, SOCK_DEAD))
667 sk->sk_data_ready(sk, 0);
668 return NET_RX_SUCCESS;
669
670 case PNS_PEP_DISCONNECT_REQ:
671 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
672 break;
673
674 case PNS_PEP_CTRL_REQ:
675 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
676 break;
677
678 case PNS_PEP_RESET_REQ:
679 case PNS_PEP_ENABLE_REQ:
680 case PNS_PEP_DISABLE_REQ:
681 /* invalid handle is not even allowed here! */
682 break;
683
684 default:
685 if ((1 << sk->sk_state)
686 & ~(TCPF_CLOSE|TCPF_LISTEN|TCPF_CLOSE_WAIT))
687 /* actively connected socket */
688 return pipe_handler_do_rcv(sk, skb);
689 }
690 drop:
691 kfree_skb(skb);
692 return NET_RX_SUCCESS;
693 }
694
695 static int pipe_do_remove(struct sock *sk)
696 {
697 struct pep_sock *pn = pep_sk(sk);
698 struct pnpipehdr *ph;
699 struct sk_buff *skb;
700
701 skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
702 if (!skb)
703 return -ENOMEM;
704
705 ph = pnp_hdr(skb);
706 ph->utid = 0;
707 ph->message_id = PNS_PIPE_REMOVE_REQ;
708 ph->pipe_handle = pn->pipe_handle;
709 ph->data[0] = PAD;
710 return pn_skb_send(sk, skb, NULL);
711 }
712
713 /* associated socket ceases to exist */
714 static void pep_sock_close(struct sock *sk, long timeout)
715 {
716 struct pep_sock *pn = pep_sk(sk);
717 int ifindex = 0;
718
719 sock_hold(sk); /* keep a reference after sk_common_release() */
720 sk_common_release(sk);
721
722 lock_sock(sk);
723 if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) {
724 if (sk->sk_backlog_rcv == pipe_do_rcv)
725 /* Forcefully remove dangling Phonet pipe */
726 pipe_do_remove(sk);
727 else
728 pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD,
729 NULL, 0);
730 }
731 sk->sk_state = TCP_CLOSE;
732
733 ifindex = pn->ifindex;
734 pn->ifindex = 0;
735 release_sock(sk);
736
737 if (ifindex)
738 gprs_detach(sk);
739 sock_put(sk);
740 }
741
742 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
743 {
744 struct pep_sock *pn = pep_sk(sk), *newpn;
745 struct sock *newsk = NULL;
746 struct sk_buff *skb;
747 struct pnpipehdr *hdr;
748 struct sockaddr_pn dst, src;
749 int err;
750 u16 peer_type;
751 u8 pipe_handle, enabled, n_sb;
752 u8 aligned = 0;
753
754 skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp);
755 if (!skb)
756 return NULL;
757
758 lock_sock(sk);
759 if (sk->sk_state != TCP_LISTEN) {
760 err = -EINVAL;
761 goto drop;
762 }
763 sk_acceptq_removed(sk);
764
765 err = -EPROTO;
766 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
767 goto drop;
768
769 hdr = pnp_hdr(skb);
770 pipe_handle = hdr->pipe_handle;
771 switch (hdr->state_after_connect) {
772 case PN_PIPE_DISABLE:
773 enabled = 0;
774 break;
775 case PN_PIPE_ENABLE:
776 enabled = 1;
777 break;
778 default:
779 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM,
780 GFP_KERNEL);
781 goto drop;
782 }
783 peer_type = hdr->other_pep_type << 8;
784
785 /* Parse sub-blocks (options) */
786 n_sb = hdr->data[4];
787 while (n_sb > 0) {
788 u8 type, buf[1], len = sizeof(buf);
789 const u8 *data = pep_get_sb(skb, &type, &len, buf);
790
791 if (data == NULL)
792 goto drop;
793 switch (type) {
794 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
795 if (len < 1)
796 goto drop;
797 peer_type = (peer_type & 0xff00) | data[0];
798 break;
799 case PN_PIPE_SB_ALIGNED_DATA:
800 aligned = data[0] != 0;
801 break;
802 }
803 n_sb--;
804 }
805
806 /* Check for duplicate pipe handle */
807 newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
808 if (unlikely(newsk)) {
809 __sock_put(newsk);
810 newsk = NULL;
811 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL);
812 goto drop;
813 }
814
815 /* Create a new to-be-accepted sock */
816 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot);
817 if (!newsk) {
818 pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL);
819 err = -ENOBUFS;
820 goto drop;
821 }
822
823 sock_init_data(NULL, newsk);
824 newsk->sk_state = TCP_SYN_RECV;
825 newsk->sk_backlog_rcv = pipe_do_rcv;
826 newsk->sk_protocol = sk->sk_protocol;
827 newsk->sk_destruct = pipe_destruct;
828
829 newpn = pep_sk(newsk);
830 pn_skb_get_dst_sockaddr(skb, &dst);
831 pn_skb_get_src_sockaddr(skb, &src);
832 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
833 newpn->pn_sk.dobject = pn_sockaddr_get_object(&src);
834 newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst);
835 sock_hold(sk);
836 newpn->listener = sk;
837 skb_queue_head_init(&newpn->ctrlreq_queue);
838 newpn->pipe_handle = pipe_handle;
839 atomic_set(&newpn->tx_credits, 0);
840 newpn->ifindex = 0;
841 newpn->peer_type = peer_type;
842 newpn->rx_credits = 0;
843 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
844 newpn->init_enable = enabled;
845 newpn->aligned = aligned;
846
847 err = pep_accept_conn(newsk, skb);
848 if (err) {
849 sock_put(newsk);
850 newsk = NULL;
851 goto drop;
852 }
853 sk_add_node(newsk, &pn->hlist);
854 drop:
855 release_sock(sk);
856 kfree_skb(skb);
857 *errp = err;
858 return newsk;
859 }
860
861 static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
862 {
863 struct pep_sock *pn = pep_sk(sk);
864 int err;
865 u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD };
866
867 pn->pipe_handle = 1; /* anything but INVALID_HANDLE */
868 err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ,
869 PN_PIPE_ENABLE, data, 4);
870 if (err) {
871 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
872 return err;
873 }
874 sk->sk_state = TCP_SYN_SENT;
875 return 0;
876 }
877
878 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
879 {
880 struct pep_sock *pn = pep_sk(sk);
881 int answ;
882
883 switch (cmd) {
884 case SIOCINQ:
885 if (sk->sk_state == TCP_LISTEN)
886 return -EINVAL;
887
888 lock_sock(sk);
889 if (sock_flag(sk, SOCK_URGINLINE) &&
890 !skb_queue_empty(&pn->ctrlreq_queue))
891 answ = skb_peek(&pn->ctrlreq_queue)->len;
892 else if (!skb_queue_empty(&sk->sk_receive_queue))
893 answ = skb_peek(&sk->sk_receive_queue)->len;
894 else
895 answ = 0;
896 release_sock(sk);
897 return put_user(answ, (int __user *)arg);
898 }
899
900 return -ENOIOCTLCMD;
901 }
902
903 static int pep_init(struct sock *sk)
904 {
905 struct pep_sock *pn = pep_sk(sk);
906
907 sk->sk_destruct = pipe_destruct;
908 INIT_HLIST_HEAD(&pn->hlist);
909 pn->listener = NULL;
910 skb_queue_head_init(&pn->ctrlreq_queue);
911 atomic_set(&pn->tx_credits, 0);
912 pn->ifindex = 0;
913 pn->peer_type = 0;
914 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
915 pn->rx_credits = 0;
916 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
917 pn->init_enable = 1;
918 pn->aligned = 0;
919 return 0;
920 }
921
922 static int pep_setsockopt(struct sock *sk, int level, int optname,
923 char __user *optval, unsigned int optlen)
924 {
925 struct pep_sock *pn = pep_sk(sk);
926 int val = 0, err = 0;
927
928 if (level != SOL_PNPIPE)
929 return -ENOPROTOOPT;
930 if (optlen >= sizeof(int)) {
931 if (get_user(val, (int __user *) optval))
932 return -EFAULT;
933 }
934
935 lock_sock(sk);
936 switch (optname) {
937 case PNPIPE_ENCAP:
938 if (val && val != PNPIPE_ENCAP_IP) {
939 err = -EINVAL;
940 break;
941 }
942 if (!pn->ifindex == !val)
943 break; /* Nothing to do! */
944 if (!capable(CAP_NET_ADMIN)) {
945 err = -EPERM;
946 break;
947 }
948 if (val) {
949 release_sock(sk);
950 err = gprs_attach(sk);
951 if (err > 0) {
952 pn->ifindex = err;
953 err = 0;
954 }
955 } else {
956 pn->ifindex = 0;
957 release_sock(sk);
958 gprs_detach(sk);
959 err = 0;
960 }
961 goto out_norel;
962
963 default:
964 err = -ENOPROTOOPT;
965 }
966 release_sock(sk);
967
968 out_norel:
969 return err;
970 }
971
972 static int pep_getsockopt(struct sock *sk, int level, int optname,
973 char __user *optval, int __user *optlen)
974 {
975 struct pep_sock *pn = pep_sk(sk);
976 int len, val;
977
978 if (level != SOL_PNPIPE)
979 return -ENOPROTOOPT;
980 if (get_user(len, optlen))
981 return -EFAULT;
982
983 switch (optname) {
984 case PNPIPE_ENCAP:
985 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
986 break;
987
988 case PNPIPE_IFINDEX:
989 val = pn->ifindex;
990 break;
991
992 case PNPIPE_HANDLE:
993 val = pn->pipe_handle;
994 if (val == PN_PIPE_INVALID_HANDLE)
995 return -EINVAL;
996 break;
997
998 default:
999 return -ENOPROTOOPT;
1000 }
1001
1002 len = min_t(unsigned int, sizeof(int), len);
1003 if (put_user(len, optlen))
1004 return -EFAULT;
1005 if (put_user(val, (int __user *) optval))
1006 return -EFAULT;
1007 return 0;
1008 }
1009
1010 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1011 {
1012 struct pep_sock *pn = pep_sk(sk);
1013 struct pnpipehdr *ph;
1014 int err;
1015
1016 if (pn_flow_safe(pn->tx_fc) &&
1017 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1018 kfree_skb(skb);
1019 return -ENOBUFS;
1020 }
1021
1022 skb_push(skb, 3 + pn->aligned);
1023 skb_reset_transport_header(skb);
1024 ph = pnp_hdr(skb);
1025 ph->utid = 0;
1026 if (pn->aligned) {
1027 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1028 ph->data[0] = 0; /* padding */
1029 } else
1030 ph->message_id = PNS_PIPE_DATA;
1031 ph->pipe_handle = pn->pipe_handle;
1032 err = pn_skb_send(sk, skb, NULL);
1033
1034 if (err && pn_flow_safe(pn->tx_fc))
1035 atomic_inc(&pn->tx_credits);
1036 return err;
1037
1038 }
1039
1040 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
1041 struct msghdr *msg, size_t len)
1042 {
1043 struct pep_sock *pn = pep_sk(sk);
1044 struct sk_buff *skb;
1045 long timeo;
1046 int flags = msg->msg_flags;
1047 int err, done;
1048
1049 if (len > USHRT_MAX)
1050 return -EMSGSIZE;
1051
1052 if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1053 MSG_CMSG_COMPAT)) ||
1054 !(msg->msg_flags & MSG_EOR))
1055 return -EOPNOTSUPP;
1056
1057 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1058 flags & MSG_DONTWAIT, &err);
1059 if (!skb)
1060 return err;
1061
1062 skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned);
1063 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1064 if (err < 0)
1065 goto outfree;
1066
1067 lock_sock(sk);
1068 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1069 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1070 err = -ENOTCONN;
1071 goto out;
1072 }
1073 if (sk->sk_state != TCP_ESTABLISHED) {
1074 /* Wait until the pipe gets to enabled state */
1075 disabled:
1076 err = sk_stream_wait_connect(sk, &timeo);
1077 if (err)
1078 goto out;
1079
1080 if (sk->sk_state == TCP_CLOSE_WAIT) {
1081 err = -ECONNRESET;
1082 goto out;
1083 }
1084 }
1085 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1086
1087 /* Wait until flow control allows TX */
1088 done = atomic_read(&pn->tx_credits);
1089 while (!done) {
1090 DEFINE_WAIT(wait);
1091
1092 if (!timeo) {
1093 err = -EAGAIN;
1094 goto out;
1095 }
1096 if (signal_pending(current)) {
1097 err = sock_intr_errno(timeo);
1098 goto out;
1099 }
1100
1101 prepare_to_wait(sk_sleep(sk), &wait,
1102 TASK_INTERRUPTIBLE);
1103 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
1104 finish_wait(sk_sleep(sk), &wait);
1105
1106 if (sk->sk_state != TCP_ESTABLISHED)
1107 goto disabled;
1108 }
1109
1110 err = pipe_skb_send(sk, skb);
1111 if (err >= 0)
1112 err = len; /* success! */
1113 skb = NULL;
1114 out:
1115 release_sock(sk);
1116 outfree:
1117 kfree_skb(skb);
1118 return err;
1119 }
1120
1121 int pep_writeable(struct sock *sk)
1122 {
1123 struct pep_sock *pn = pep_sk(sk);
1124
1125 return atomic_read(&pn->tx_credits);
1126 }
1127
1128 int pep_write(struct sock *sk, struct sk_buff *skb)
1129 {
1130 struct sk_buff *rskb, *fs;
1131 int flen = 0;
1132
1133 if (pep_sk(sk)->aligned)
1134 return pipe_skb_send(sk, skb);
1135
1136 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1137 if (!rskb) {
1138 kfree_skb(skb);
1139 return -ENOMEM;
1140 }
1141 skb_shinfo(rskb)->frag_list = skb;
1142 rskb->len += skb->len;
1143 rskb->data_len += rskb->len;
1144 rskb->truesize += rskb->len;
1145
1146 /* Avoid nested fragments */
1147 skb_walk_frags(skb, fs)
1148 flen += fs->len;
1149 skb->next = skb_shinfo(skb)->frag_list;
1150 skb_frag_list_init(skb);
1151 skb->len -= flen;
1152 skb->data_len -= flen;
1153 skb->truesize -= flen;
1154
1155 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1156 return pipe_skb_send(sk, rskb);
1157 }
1158
1159 struct sk_buff *pep_read(struct sock *sk)
1160 {
1161 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1162
1163 if (sk->sk_state == TCP_ESTABLISHED)
1164 pipe_grant_credits(sk, GFP_ATOMIC);
1165 return skb;
1166 }
1167
1168 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
1169 struct msghdr *msg, size_t len, int noblock,
1170 int flags, int *addr_len)
1171 {
1172 struct sk_buff *skb;
1173 int err;
1174
1175 if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1176 MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1177 return -EOPNOTSUPP;
1178
1179 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1180 return -ENOTCONN;
1181
1182 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1183 /* Dequeue and acknowledge control request */
1184 struct pep_sock *pn = pep_sk(sk);
1185
1186 if (flags & MSG_PEEK)
1187 return -EOPNOTSUPP;
1188 skb = skb_dequeue(&pn->ctrlreq_queue);
1189 if (skb) {
1190 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1191 GFP_KERNEL);
1192 msg->msg_flags |= MSG_OOB;
1193 goto copy;
1194 }
1195 if (flags & MSG_OOB)
1196 return -EINVAL;
1197 }
1198
1199 skb = skb_recv_datagram(sk, flags, noblock, &err);
1200 lock_sock(sk);
1201 if (skb == NULL) {
1202 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1203 err = -ECONNRESET;
1204 release_sock(sk);
1205 return err;
1206 }
1207
1208 if (sk->sk_state == TCP_ESTABLISHED)
1209 pipe_grant_credits(sk, GFP_KERNEL);
1210 release_sock(sk);
1211 copy:
1212 msg->msg_flags |= MSG_EOR;
1213 if (skb->len > len)
1214 msg->msg_flags |= MSG_TRUNC;
1215 else
1216 len = skb->len;
1217
1218 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1219 if (!err)
1220 err = (flags & MSG_TRUNC) ? skb->len : len;
1221
1222 skb_free_datagram(sk, skb);
1223 return err;
1224 }
1225
1226 static void pep_sock_unhash(struct sock *sk)
1227 {
1228 struct pep_sock *pn = pep_sk(sk);
1229 struct sock *skparent = NULL;
1230
1231 lock_sock(sk);
1232
1233 if (pn->listener != NULL) {
1234 skparent = pn->listener;
1235 pn->listener = NULL;
1236 release_sock(sk);
1237
1238 pn = pep_sk(skparent);
1239 lock_sock(skparent);
1240 sk_del_node_init(sk);
1241 sk = skparent;
1242 }
1243
1244 /* Unhash a listening sock only when it is closed
1245 * and all of its active connected pipes are closed. */
1246 if (hlist_empty(&pn->hlist))
1247 pn_sock_unhash(&pn->pn_sk.sk);
1248 release_sock(sk);
1249
1250 if (skparent)
1251 sock_put(skparent);
1252 }
1253
1254 static struct proto pep_proto = {
1255 .close = pep_sock_close,
1256 .accept = pep_sock_accept,
1257 .connect = pep_sock_connect,
1258 .ioctl = pep_ioctl,
1259 .init = pep_init,
1260 .setsockopt = pep_setsockopt,
1261 .getsockopt = pep_getsockopt,
1262 .sendmsg = pep_sendmsg,
1263 .recvmsg = pep_recvmsg,
1264 .backlog_rcv = pep_do_rcv,
1265 .hash = pn_sock_hash,
1266 .unhash = pep_sock_unhash,
1267 .get_port = pn_sock_get_port,
1268 .obj_size = sizeof(struct pep_sock),
1269 .owner = THIS_MODULE,
1270 .name = "PNPIPE",
1271 };
1272
1273 static struct phonet_protocol pep_pn_proto = {
1274 .ops = &phonet_stream_ops,
1275 .prot = &pep_proto,
1276 .sock_type = SOCK_SEQPACKET,
1277 };
1278
1279 static int __init pep_register(void)
1280 {
1281 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1282 }
1283
1284 static void __exit pep_unregister(void)
1285 {
1286 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1287 }
1288
1289 module_init(pep_register);
1290 module_exit(pep_unregister);
1291 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1292 MODULE_DESCRIPTION("Phonet pipe protocol");
1293 MODULE_LICENSE("GPL");
1294 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
Linux with added FPC-III support