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net: Move && and || to end of previous line
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / phonet / pep.c
blobb6356f3832f6e69cdc3fc7c2a076fab9f22efcd1
1 /*
2 * File: pep.c
3 *
4 * Phonet pipe protocol end point socket
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
8 * Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * version 2 as published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
22 * 02110-1301 USA
23 */
24
25 #include <linux/kernel.h>
26 #include <linux/socket.h>
27 #include <net/sock.h>
28 #include <net/tcp_states.h>
29 #include <asm/ioctls.h>
30
31 #include <linux/phonet.h>
32 #include <net/phonet/phonet.h>
33 #include <net/phonet/pep.h>
34 #include <net/phonet/gprs.h>
35
36 /* sk_state values:
37 * TCP_CLOSE sock not in use yet
38 * TCP_CLOSE_WAIT disconnected pipe
39 * TCP_LISTEN listening pipe endpoint
40 * TCP_SYN_RECV connected pipe in disabled state
41 * TCP_ESTABLISHED connected pipe in enabled state
42 *
43 * pep_sock locking:
44 * - sk_state, ackq, hlist: sock lock needed
45 * - listener: read only
46 * - pipe_handle: read only
47 */
48
49 #define CREDITS_MAX 10
50 #define CREDITS_THR 7
51
52 static const struct sockaddr_pn pipe_srv = {
53 .spn_family = AF_PHONET,
54 .spn_resource = 0xD9, /* pipe service */
55 };
56
57 #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
58
59 /* Get the next TLV sub-block. */
60 static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
61 void *buf)
62 {
63 void *data = NULL;
64 struct {
65 u8 sb_type;
66 u8 sb_len;
67 } *ph, h;
68 int buflen = *plen;
69
70 ph = skb_header_pointer(skb, 0, 2, &h);
71 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
72 return NULL;
73 ph->sb_len -= 2;
74 *ptype = ph->sb_type;
75 *plen = ph->sb_len;
76
77 if (buflen > ph->sb_len)
78 buflen = ph->sb_len;
79 data = skb_header_pointer(skb, 2, buflen, buf);
80 __skb_pull(skb, 2 + ph->sb_len);
81 return data;
82 }
83
84 static int pep_reply(struct sock *sk, struct sk_buff *oskb,
85 u8 code, const void *data, int len, gfp_t priority)
86 {
87 const struct pnpipehdr *oph = pnp_hdr(oskb);
88 struct pnpipehdr *ph;
89 struct sk_buff *skb;
90
91 skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
92 if (!skb)
93 return -ENOMEM;
94 skb_set_owner_w(skb, sk);
95
96 skb_reserve(skb, MAX_PNPIPE_HEADER);
97 __skb_put(skb, len);
98 skb_copy_to_linear_data(skb, data, len);
99 __skb_push(skb, sizeof(*ph));
100 skb_reset_transport_header(skb);
101 ph = pnp_hdr(skb);
102 ph->utid = oph->utid;
103 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
104 ph->pipe_handle = oph->pipe_handle;
105 ph->error_code = code;
106
107 return pn_skb_send(sk, skb, &pipe_srv);
108 }
109
110 #define PAD 0x00
111 static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
112 {
113 static const u8 data[20] = {
114 PAD, PAD, PAD, 2 /* sub-blocks */,
115 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
116 PN_MULTI_CREDIT_FLOW_CONTROL,
117 PN_ONE_CREDIT_FLOW_CONTROL,
118 PN_LEGACY_FLOW_CONTROL,
119 PAD,
120 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
121 PN_MULTI_CREDIT_FLOW_CONTROL,
122 PN_ONE_CREDIT_FLOW_CONTROL,
123 PN_LEGACY_FLOW_CONTROL,
124 PAD,
125 };
126
127 might_sleep();
128 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
129 GFP_KERNEL);
130 }
131
132 static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code)
133 {
134 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
135 WARN_ON(code == PN_PIPE_NO_ERROR);
136 return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC);
137 }
138
139 /* Control requests are not sent by the pipe service and have a specific
140 * message format. */
141 static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
142 gfp_t priority)
143 {
144 const struct pnpipehdr *oph = pnp_hdr(oskb);
145 struct sk_buff *skb;
146 struct pnpipehdr *ph;
147 struct sockaddr_pn dst;
148
149 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
150 if (!skb)
151 return -ENOMEM;
152 skb_set_owner_w(skb, sk);
153
154 skb_reserve(skb, MAX_PHONET_HEADER);
155 ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
156
157 ph->utid = oph->utid;
158 ph->message_id = PNS_PEP_CTRL_RESP;
159 ph->pipe_handle = oph->pipe_handle;
160 ph->data[0] = oph->data[1]; /* CTRL id */
161 ph->data[1] = oph->data[0]; /* PEP type */
162 ph->data[2] = code; /* error code, at an usual offset */
163 ph->data[3] = PAD;
164 ph->data[4] = PAD;
165
166 pn_skb_get_src_sockaddr(oskb, &dst);
167 return pn_skb_send(sk, skb, &dst);
168 }
169
170 static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
171 {
172 struct pep_sock *pn = pep_sk(sk);
173 struct pnpipehdr *ph;
174 struct sk_buff *skb;
175
176 skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
177 if (!skb)
178 return -ENOMEM;
179 skb_set_owner_w(skb, sk);
180
181 skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
182 __skb_push(skb, sizeof(*ph) + 4);
183 skb_reset_transport_header(skb);
184 ph = pnp_hdr(skb);
185 ph->utid = 0;
186 ph->message_id = PNS_PEP_STATUS_IND;
187 ph->pipe_handle = pn->pipe_handle;
188 ph->pep_type = PN_PEP_TYPE_COMMON;
189 ph->data[1] = type;
190 ph->data[2] = PAD;
191 ph->data[3] = PAD;
192 ph->data[4] = status;
193
194 return pn_skb_send(sk, skb, &pipe_srv);
195 }
196
197 /* Send our RX flow control information to the sender.
198 * Socket must be locked. */
199 static void pipe_grant_credits(struct sock *sk)
200 {
201 struct pep_sock *pn = pep_sk(sk);
202
203 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
204
205 switch (pn->rx_fc) {
206 case PN_LEGACY_FLOW_CONTROL: /* TODO */
207 break;
208 case PN_ONE_CREDIT_FLOW_CONTROL:
209 pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
210 PEP_IND_READY, GFP_ATOMIC);
211 pn->rx_credits = 1;
212 break;
213 case PN_MULTI_CREDIT_FLOW_CONTROL:
214 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
215 break;
216 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
217 CREDITS_MAX - pn->rx_credits,
218 GFP_ATOMIC) == 0)
219 pn->rx_credits = CREDITS_MAX;
220 break;
221 }
222 }
223
224 static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
225 {
226 struct pep_sock *pn = pep_sk(sk);
227 struct pnpipehdr *hdr = pnp_hdr(skb);
228 int wake = 0;
229
230 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
231 return -EINVAL;
232
233 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
234 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
235 (unsigned)hdr->data[0]);
236 return -EOPNOTSUPP;
237 }
238
239 switch (hdr->data[1]) {
240 case PN_PEP_IND_FLOW_CONTROL:
241 switch (pn->tx_fc) {
242 case PN_LEGACY_FLOW_CONTROL:
243 switch (hdr->data[4]) {
244 case PEP_IND_BUSY:
245 atomic_set(&pn->tx_credits, 0);
246 break;
247 case PEP_IND_READY:
248 atomic_set(&pn->tx_credits, wake = 1);
249 break;
250 }
251 break;
252 case PN_ONE_CREDIT_FLOW_CONTROL:
253 if (hdr->data[4] == PEP_IND_READY)
254 atomic_set(&pn->tx_credits, wake = 1);
255 break;
256 }
257 break;
258
259 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
260 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
261 break;
262 atomic_add(wake = hdr->data[4], &pn->tx_credits);
263 break;
264
265 default:
266 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
267 (unsigned)hdr->data[1]);
268 return -EOPNOTSUPP;
269 }
270 if (wake)
271 sk->sk_write_space(sk);
272 return 0;
273 }
274
275 static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
276 {
277 struct pep_sock *pn = pep_sk(sk);
278 struct pnpipehdr *hdr = pnp_hdr(skb);
279 u8 n_sb = hdr->data[0];
280
281 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
282 __skb_pull(skb, sizeof(*hdr));
283 while (n_sb > 0) {
284 u8 type, buf[2], len = sizeof(buf);
285 u8 *data = pep_get_sb(skb, &type, &len, buf);
286
287 if (data == NULL)
288 return -EINVAL;
289 switch (type) {
290 case PN_PIPE_SB_NEGOTIATED_FC:
291 if (len < 2 || (data[0] | data[1]) > 3)
292 break;
293 pn->tx_fc = data[0] & 3;
294 pn->rx_fc = data[1] & 3;
295 break;
296 }
297 n_sb--;
298 }
299 return 0;
300 }
301
302 /* Queue an skb to a connected sock.
303 * Socket lock must be held. */
304 static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
305 {
306 struct pep_sock *pn = pep_sk(sk);
307 struct pnpipehdr *hdr = pnp_hdr(skb);
308 struct sk_buff_head *queue;
309 int err = 0;
310
311 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
312
313 switch (hdr->message_id) {
314 case PNS_PEP_CONNECT_REQ:
315 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
316 break;
317
318 case PNS_PEP_DISCONNECT_REQ:
319 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
320 sk->sk_state = TCP_CLOSE_WAIT;
321 if (!sock_flag(sk, SOCK_DEAD))
322 sk->sk_state_change(sk);
323 break;
324
325 case PNS_PEP_ENABLE_REQ:
326 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
327 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
328 break;
329
330 case PNS_PEP_RESET_REQ:
331 switch (hdr->state_after_reset) {
332 case PN_PIPE_DISABLE:
333 pn->init_enable = 0;
334 break;
335 case PN_PIPE_ENABLE:
336 pn->init_enable = 1;
337 break;
338 default: /* not allowed to send an error here!? */
339 err = -EINVAL;
340 goto out;
341 }
342 /* fall through */
343 case PNS_PEP_DISABLE_REQ:
344 atomic_set(&pn->tx_credits, 0);
345 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
346 break;
347
348 case PNS_PEP_CTRL_REQ:
349 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
350 atomic_inc(&sk->sk_drops);
351 break;
352 }
353 __skb_pull(skb, 4);
354 queue = &pn->ctrlreq_queue;
355 goto queue;
356
357 case PNS_PIPE_DATA:
358 __skb_pull(skb, 3); /* Pipe data header */
359 if (!pn_flow_safe(pn->rx_fc)) {
360 err = sock_queue_rcv_skb(sk, skb);
361 if (!err)
362 return 0;
363 break;
364 }
365
366 if (pn->rx_credits == 0) {
367 atomic_inc(&sk->sk_drops);
368 err = -ENOBUFS;
369 break;
370 }
371 pn->rx_credits--;
372 queue = &sk->sk_receive_queue;
373 goto queue;
374
375 case PNS_PEP_STATUS_IND:
376 pipe_rcv_status(sk, skb);
377 break;
378
379 case PNS_PIPE_REDIRECTED_IND:
380 err = pipe_rcv_created(sk, skb);
381 break;
382
383 case PNS_PIPE_CREATED_IND:
384 err = pipe_rcv_created(sk, skb);
385 if (err)
386 break;
387 /* fall through */
388 case PNS_PIPE_RESET_IND:
389 if (!pn->init_enable)
390 break;
391 /* fall through */
392 case PNS_PIPE_ENABLED_IND:
393 if (!pn_flow_safe(pn->tx_fc)) {
394 atomic_set(&pn->tx_credits, 1);
395 sk->sk_write_space(sk);
396 }
397 if (sk->sk_state == TCP_ESTABLISHED)
398 break; /* Nothing to do */
399 sk->sk_state = TCP_ESTABLISHED;
400 pipe_grant_credits(sk);
401 break;
402
403 case PNS_PIPE_DISABLED_IND:
404 sk->sk_state = TCP_SYN_RECV;
405 pn->rx_credits = 0;
406 break;
407
408 default:
409 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
410 hdr->message_id);
411 err = -EINVAL;
412 }
413 out:
414 kfree_skb(skb);
415 return err;
416
417 queue:
418 skb->dev = NULL;
419 skb_set_owner_r(skb, sk);
420 err = skb->len;
421 skb_queue_tail(queue, skb);
422 if (!sock_flag(sk, SOCK_DEAD))
423 sk->sk_data_ready(sk, err);
424 return 0;
425 }
426
427 /* Destroy connected sock. */
428 static void pipe_destruct(struct sock *sk)
429 {
430 struct pep_sock *pn = pep_sk(sk);
431
432 skb_queue_purge(&sk->sk_receive_queue);
433 skb_queue_purge(&pn->ctrlreq_queue);
434 }
435
436 static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb)
437 {
438 struct sock *newsk;
439 struct pep_sock *newpn, *pn = pep_sk(sk);
440 struct pnpipehdr *hdr;
441 struct sockaddr_pn dst;
442 u16 peer_type;
443 u8 pipe_handle, enabled, n_sb;
444
445 if (!pskb_pull(skb, sizeof(*hdr) + 4))
446 return -EINVAL;
447
448 hdr = pnp_hdr(skb);
449 pipe_handle = hdr->pipe_handle;
450 switch (hdr->state_after_connect) {
451 case PN_PIPE_DISABLE:
452 enabled = 0;
453 break;
454 case PN_PIPE_ENABLE:
455 enabled = 1;
456 break;
457 default:
458 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM);
459 return -EINVAL;
460 }
461 peer_type = hdr->other_pep_type << 8;
462
463 if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) {
464 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE);
465 return -ENOBUFS;
466 }
467
468 /* Parse sub-blocks (options) */
469 n_sb = hdr->data[4];
470 while (n_sb > 0) {
471 u8 type, buf[1], len = sizeof(buf);
472 const u8 *data = pep_get_sb(skb, &type, &len, buf);
473
474 if (data == NULL)
475 return -EINVAL;
476 switch (type) {
477 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
478 if (len < 1)
479 return -EINVAL;
480 peer_type = (peer_type & 0xff00) | data[0];
481 break;
482 }
483 n_sb--;
484 }
485
486 skb = skb_clone(skb, GFP_ATOMIC);
487 if (!skb)
488 return -ENOMEM;
489
490 /* Create a new to-be-accepted sock */
491 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot);
492 if (!newsk) {
493 kfree_skb(skb);
494 return -ENOMEM;
495 }
496 sock_init_data(NULL, newsk);
497 newsk->sk_state = TCP_SYN_RECV;
498 newsk->sk_backlog_rcv = pipe_do_rcv;
499 newsk->sk_protocol = sk->sk_protocol;
500 newsk->sk_destruct = pipe_destruct;
501
502 newpn = pep_sk(newsk);
503 pn_skb_get_dst_sockaddr(skb, &dst);
504 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
505 newpn->pn_sk.resource = pn->pn_sk.resource;
506 skb_queue_head_init(&newpn->ctrlreq_queue);
507 newpn->pipe_handle = pipe_handle;
508 atomic_set(&newpn->tx_credits, 0);
509 newpn->peer_type = peer_type;
510 newpn->rx_credits = 0;
511 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
512 newpn->init_enable = enabled;
513
514 BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue));
515 skb_queue_head(&newsk->sk_receive_queue, skb);
516 if (!sock_flag(sk, SOCK_DEAD))
517 sk->sk_data_ready(sk, 0);
518
519 sk_acceptq_added(sk);
520 sk_add_node(newsk, &pn->ackq);
521 return 0;
522 }
523
524 /* Listening sock must be locked */
525 static struct sock *pep_find_pipe(const struct hlist_head *hlist,
526 const struct sockaddr_pn *dst,
527 u8 pipe_handle)
528 {
529 struct hlist_node *node;
530 struct sock *sknode;
531 u16 dobj = pn_sockaddr_get_object(dst);
532
533 sk_for_each(sknode, node, hlist) {
534 struct pep_sock *pnnode = pep_sk(sknode);
535
536 /* Ports match, but addresses might not: */
537 if (pnnode->pn_sk.sobject != dobj)
538 continue;
539 if (pnnode->pipe_handle != pipe_handle)
540 continue;
541 if (sknode->sk_state == TCP_CLOSE_WAIT)
542 continue;
543
544 sock_hold(sknode);
545 return sknode;
546 }
547 return NULL;
548 }
549
550 /*
551 * Deliver an skb to a listening sock.
552 * Socket lock must be held.
553 * We then queue the skb to the right connected sock (if any).
554 */
555 static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
556 {
557 struct pep_sock *pn = pep_sk(sk);
558 struct sock *sknode;
559 struct pnpipehdr *hdr;
560 struct sockaddr_pn dst;
561 int err = NET_RX_SUCCESS;
562 u8 pipe_handle;
563
564 if (!pskb_may_pull(skb, sizeof(*hdr)))
565 goto drop;
566
567 hdr = pnp_hdr(skb);
568 pipe_handle = hdr->pipe_handle;
569 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
570 goto drop;
571
572 pn_skb_get_dst_sockaddr(skb, &dst);
573
574 /* Look for an existing pipe handle */
575 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
576 if (sknode)
577 return sk_receive_skb(sknode, skb, 1);
578
579 /* Look for a pipe handle pending accept */
580 sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle);
581 if (sknode) {
582 sock_put(sknode);
583 if (net_ratelimit())
584 printk(KERN_WARNING"Phonet unconnected PEP ignored");
585 err = NET_RX_DROP;
586 goto drop;
587 }
588
589 switch (hdr->message_id) {
590 case PNS_PEP_CONNECT_REQ:
591 err = pep_connreq_rcv(sk, skb);
592 break;
593
594 case PNS_PEP_DISCONNECT_REQ:
595 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
596 break;
597
598 case PNS_PEP_CTRL_REQ:
599 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
600 break;
601
602 case PNS_PEP_RESET_REQ:
603 case PNS_PEP_ENABLE_REQ:
604 case PNS_PEP_DISABLE_REQ:
605 /* invalid handle is not even allowed here! */
606 default:
607 err = NET_RX_DROP;
608 }
609 drop:
610 kfree_skb(skb);
611 return err;
612 }
613
614 /* associated socket ceases to exist */
615 static void pep_sock_close(struct sock *sk, long timeout)
616 {
617 struct pep_sock *pn = pep_sk(sk);
618 int ifindex = 0;
619
620 sk_common_release(sk);
621
622 lock_sock(sk);
623 if (sk->sk_state == TCP_LISTEN) {
624 /* Destroy the listen queue */
625 struct sock *sknode;
626 struct hlist_node *p, *n;
627
628 sk_for_each_safe(sknode, p, n, &pn->ackq)
629 sk_del_node_init(sknode);
630 sk->sk_state = TCP_CLOSE;
631 }
632 ifindex = pn->ifindex;
633 pn->ifindex = 0;
634 release_sock(sk);
635
636 if (ifindex)
637 gprs_detach(sk);
638 }
639
640 static int pep_wait_connreq(struct sock *sk, int noblock)
641 {
642 struct task_struct *tsk = current;
643 struct pep_sock *pn = pep_sk(sk);
644 long timeo = sock_rcvtimeo(sk, noblock);
645
646 for (;;) {
647 DEFINE_WAIT(wait);
648
649 if (sk->sk_state != TCP_LISTEN)
650 return -EINVAL;
651 if (!hlist_empty(&pn->ackq))
652 break;
653 if (!timeo)
654 return -EWOULDBLOCK;
655 if (signal_pending(tsk))
656 return sock_intr_errno(timeo);
657
658 prepare_to_wait_exclusive(&sk->sk_socket->wait, &wait,
659 TASK_INTERRUPTIBLE);
660 release_sock(sk);
661 timeo = schedule_timeout(timeo);
662 lock_sock(sk);
663 finish_wait(&sk->sk_socket->wait, &wait);
664 }
665
666 return 0;
667 }
668
669 static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
670 {
671 struct pep_sock *pn = pep_sk(sk);
672 struct sock *newsk = NULL;
673 struct sk_buff *oskb;
674 int err;
675
676 lock_sock(sk);
677 err = pep_wait_connreq(sk, flags & O_NONBLOCK);
678 if (err)
679 goto out;
680
681 newsk = __sk_head(&pn->ackq);
682
683 oskb = skb_dequeue(&newsk->sk_receive_queue);
684 err = pep_accept_conn(newsk, oskb);
685 if (err) {
686 skb_queue_head(&newsk->sk_receive_queue, oskb);
687 newsk = NULL;
688 goto out;
689 }
690
691 sock_hold(sk);
692 pep_sk(newsk)->listener = sk;
693
694 sock_hold(newsk);
695 sk_del_node_init(newsk);
696 sk_acceptq_removed(sk);
697 sk_add_node(newsk, &pn->hlist);
698 __sock_put(newsk);
699
700 out:
701 release_sock(sk);
702 *errp = err;
703 return newsk;
704 }
705
706 static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
707 {
708 struct pep_sock *pn = pep_sk(sk);
709 int answ;
710
711 switch (cmd) {
712 case SIOCINQ:
713 if (sk->sk_state == TCP_LISTEN)
714 return -EINVAL;
715
716 lock_sock(sk);
717 if (sock_flag(sk, SOCK_URGINLINE) &&
718 !skb_queue_empty(&pn->ctrlreq_queue))
719 answ = skb_peek(&pn->ctrlreq_queue)->len;
720 else if (!skb_queue_empty(&sk->sk_receive_queue))
721 answ = skb_peek(&sk->sk_receive_queue)->len;
722 else
723 answ = 0;
724 release_sock(sk);
725 return put_user(answ, (int __user *)arg);
726 }
727
728 return -ENOIOCTLCMD;
729 }
730
731 static int pep_init(struct sock *sk)
732 {
733 struct pep_sock *pn = pep_sk(sk);
734
735 INIT_HLIST_HEAD(&pn->ackq);
736 INIT_HLIST_HEAD(&pn->hlist);
737 skb_queue_head_init(&pn->ctrlreq_queue);
738 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
739 return 0;
740 }
741
742 static int pep_setsockopt(struct sock *sk, int level, int optname,
743 char __user *optval, unsigned int optlen)
744 {
745 struct pep_sock *pn = pep_sk(sk);
746 int val = 0, err = 0;
747
748 if (level != SOL_PNPIPE)
749 return -ENOPROTOOPT;
750 if (optlen >= sizeof(int)) {
751 if (get_user(val, (int __user *) optval))
752 return -EFAULT;
753 }
754
755 lock_sock(sk);
756 switch (optname) {
757 case PNPIPE_ENCAP:
758 if (val && val != PNPIPE_ENCAP_IP) {
759 err = -EINVAL;
760 break;
761 }
762 if (!pn->ifindex == !val)
763 break; /* Nothing to do! */
764 if (!capable(CAP_NET_ADMIN)) {
765 err = -EPERM;
766 break;
767 }
768 if (val) {
769 release_sock(sk);
770 err = gprs_attach(sk);
771 if (err > 0) {
772 pn->ifindex = err;
773 err = 0;
774 }
775 } else {
776 pn->ifindex = 0;
777 release_sock(sk);
778 gprs_detach(sk);
779 err = 0;
780 }
781 goto out_norel;
782 default:
783 err = -ENOPROTOOPT;
784 }
785 release_sock(sk);
786
787 out_norel:
788 return err;
789 }
790
791 static int pep_getsockopt(struct sock *sk, int level, int optname,
792 char __user *optval, int __user *optlen)
793 {
794 struct pep_sock *pn = pep_sk(sk);
795 int len, val;
796
797 if (level != SOL_PNPIPE)
798 return -ENOPROTOOPT;
799 if (get_user(len, optlen))
800 return -EFAULT;
801
802 switch (optname) {
803 case PNPIPE_ENCAP:
804 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
805 break;
806 case PNPIPE_IFINDEX:
807 val = pn->ifindex;
808 break;
809 default:
810 return -ENOPROTOOPT;
811 }
812
813 len = min_t(unsigned int, sizeof(int), len);
814 if (put_user(len, optlen))
815 return -EFAULT;
816 if (put_user(val, (int __user *) optval))
817 return -EFAULT;
818 return 0;
819 }
820
821 static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
822 {
823 struct pep_sock *pn = pep_sk(sk);
824 struct pnpipehdr *ph;
825
826 if (pn_flow_safe(pn->tx_fc) &&
827 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
828 kfree_skb(skb);
829 return -ENOBUFS;
830 }
831
832 skb_push(skb, 3);
833 skb_reset_transport_header(skb);
834 ph = pnp_hdr(skb);
835 ph->utid = 0;
836 ph->message_id = PNS_PIPE_DATA;
837 ph->pipe_handle = pn->pipe_handle;
838
839 return pn_skb_send(sk, skb, &pipe_srv);
840 }
841
842 static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
843 struct msghdr *msg, size_t len)
844 {
845 struct pep_sock *pn = pep_sk(sk);
846 struct sk_buff *skb;
847 long timeo;
848 int flags = msg->msg_flags;
849 int err, done;
850
851 if (msg->msg_flags & MSG_OOB || !(msg->msg_flags & MSG_EOR))
852 return -EOPNOTSUPP;
853
854 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
855 flags & MSG_DONTWAIT, &err);
856 if (!skb)
857 return -ENOBUFS;
858
859 skb_reserve(skb, MAX_PHONET_HEADER + 3);
860 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
861 if (err < 0)
862 goto outfree;
863
864 lock_sock(sk);
865 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
866 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
867 err = -ENOTCONN;
868 goto out;
869 }
870 if (sk->sk_state != TCP_ESTABLISHED) {
871 /* Wait until the pipe gets to enabled state */
872 disabled:
873 err = sk_stream_wait_connect(sk, &timeo);
874 if (err)
875 goto out;
876
877 if (sk->sk_state == TCP_CLOSE_WAIT) {
878 err = -ECONNRESET;
879 goto out;
880 }
881 }
882 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
883
884 /* Wait until flow control allows TX */
885 done = atomic_read(&pn->tx_credits);
886 while (!done) {
887 DEFINE_WAIT(wait);
888
889 if (!timeo) {
890 err = -EAGAIN;
891 goto out;
892 }
893 if (signal_pending(current)) {
894 err = sock_intr_errno(timeo);
895 goto out;
896 }
897
898 prepare_to_wait(&sk->sk_socket->wait, &wait,
899 TASK_INTERRUPTIBLE);
900 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
901 finish_wait(&sk->sk_socket->wait, &wait);
902
903 if (sk->sk_state != TCP_ESTABLISHED)
904 goto disabled;
905 }
906
907 err = pipe_skb_send(sk, skb);
908 if (err >= 0)
909 err = len; /* success! */
910 skb = NULL;
911 out:
912 release_sock(sk);
913 outfree:
914 kfree_skb(skb);
915 return err;
916 }
917
918 int pep_writeable(struct sock *sk)
919 {
920 struct pep_sock *pn = pep_sk(sk);
921
922 return atomic_read(&pn->tx_credits);
923 }
924
925 int pep_write(struct sock *sk, struct sk_buff *skb)
926 {
927 struct sk_buff *rskb, *fs;
928 int flen = 0;
929
930 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
931 if (!rskb) {
932 kfree_skb(skb);
933 return -ENOMEM;
934 }
935 skb_shinfo(rskb)->frag_list = skb;
936 rskb->len += skb->len;
937 rskb->data_len += rskb->len;
938 rskb->truesize += rskb->len;
939
940 /* Avoid nested fragments */
941 skb_walk_frags(skb, fs)
942 flen += fs->len;
943 skb->next = skb_shinfo(skb)->frag_list;
944 skb_frag_list_init(skb);
945 skb->len -= flen;
946 skb->data_len -= flen;
947 skb->truesize -= flen;
948
949 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
950 return pipe_skb_send(sk, rskb);
951 }
952
953 struct sk_buff *pep_read(struct sock *sk)
954 {
955 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
956
957 if (sk->sk_state == TCP_ESTABLISHED)
958 pipe_grant_credits(sk);
959 return skb;
960 }
961
962 static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
963 struct msghdr *msg, size_t len, int noblock,
964 int flags, int *addr_len)
965 {
966 struct sk_buff *skb;
967 int err;
968
969 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
970 return -ENOTCONN;
971
972 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
973 /* Dequeue and acknowledge control request */
974 struct pep_sock *pn = pep_sk(sk);
975
976 skb = skb_dequeue(&pn->ctrlreq_queue);
977 if (skb) {
978 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
979 GFP_KERNEL);
980 msg->msg_flags |= MSG_OOB;
981 goto copy;
982 }
983 if (flags & MSG_OOB)
984 return -EINVAL;
985 }
986
987 skb = skb_recv_datagram(sk, flags, noblock, &err);
988 lock_sock(sk);
989 if (skb == NULL) {
990 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
991 err = -ECONNRESET;
992 release_sock(sk);
993 return err;
994 }
995
996 if (sk->sk_state == TCP_ESTABLISHED)
997 pipe_grant_credits(sk);
998 release_sock(sk);
999 copy:
1000 msg->msg_flags |= MSG_EOR;
1001 if (skb->len > len)
1002 msg->msg_flags |= MSG_TRUNC;
1003 else
1004 len = skb->len;
1005
1006 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1007 if (!err)
1008 err = (flags & MSG_TRUNC) ? skb->len : len;
1009
1010 skb_free_datagram(sk, skb);
1011 return err;
1012 }
1013
1014 static void pep_sock_unhash(struct sock *sk)
1015 {
1016 struct pep_sock *pn = pep_sk(sk);
1017 struct sock *skparent = NULL;
1018
1019 lock_sock(sk);
1020 if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) {
1021 skparent = pn->listener;
1022 sk_del_node_init(sk);
1023 release_sock(sk);
1024
1025 sk = skparent;
1026 pn = pep_sk(skparent);
1027 lock_sock(sk);
1028 }
1029 /* Unhash a listening sock only when it is closed
1030 * and all of its active connected pipes are closed. */
1031 if (hlist_empty(&pn->hlist))
1032 pn_sock_unhash(&pn->pn_sk.sk);
1033 release_sock(sk);
1034
1035 if (skparent)
1036 sock_put(skparent);
1037 }
1038
1039 static struct proto pep_proto = {
1040 .close = pep_sock_close,
1041 .accept = pep_sock_accept,
1042 .ioctl = pep_ioctl,
1043 .init = pep_init,
1044 .setsockopt = pep_setsockopt,
1045 .getsockopt = pep_getsockopt,
1046 .sendmsg = pep_sendmsg,
1047 .recvmsg = pep_recvmsg,
1048 .backlog_rcv = pep_do_rcv,
1049 .hash = pn_sock_hash,
1050 .unhash = pep_sock_unhash,
1051 .get_port = pn_sock_get_port,
1052 .obj_size = sizeof(struct pep_sock),
1053 .owner = THIS_MODULE,
1054 .name = "PNPIPE",
1055 };
1056
1057 static struct phonet_protocol pep_pn_proto = {
1058 .ops = &phonet_stream_ops,
1059 .prot = &pep_proto,
1060 .sock_type = SOCK_SEQPACKET,
1061 };
1062
1063 static int __init pep_register(void)
1064 {
1065 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1066 }
1067
1068 static void __exit pep_unregister(void)
1069 {
1070 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1071 }
1072
1073 module_init(pep_register);
1074 module_exit(pep_unregister);
1075 MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1076 MODULE_DESCRIPTION("Phonet pipe protocol");
1077 MODULE_LICENSE("GPL");
1078 MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree