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