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1 | /* |
2 | * File: pep.c |
3 | * |
4 | * Phonet pipe protocol end point socket |
5 | * |
6 | * Copyright (C) 2008 Nokia Corporation. |
7 | * |
8 | * Author: RĂ©mi Denis-Courmont <remi.denis-courmont@nokia.com> |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License |
12 | * version 2 as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, but |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | * General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
22 | * 02110-1301 USA |
23 | */ |
24 | |
25 | #include <linux/kernel.h> |
26 | #include <linux/slab.h> |
27 | #include <linux/socket.h> |
28 | #include <net/sock.h> |
29 | #include <net/tcp_states.h> |
30 | #include <asm/ioctls.h> |
31 | |
32 | #include <linux/phonet.h> |
33 | #include <net/phonet/phonet.h> |
34 | #include <net/phonet/pep.h> |
35 | #include <net/phonet/gprs.h> |
36 | |
37 | /* sk_state values: |
38 | * TCP_CLOSE sock not in use yet |
39 | * TCP_CLOSE_WAIT disconnected pipe |
40 | * TCP_LISTEN listening pipe endpoint |
41 | * TCP_SYN_RECV connected pipe in disabled state |
42 | * TCP_ESTABLISHED connected pipe in enabled state |
43 | * |
44 | * pep_sock locking: |
45 | * - sk_state, ackq, hlist: sock lock needed |
46 | * - listener: read only |
47 | * - pipe_handle: read only |
48 | */ |
49 | |
50 | #define CREDITS_MAX 10 |
51 | #define CREDITS_THR 7 |
52 | |
53 | static const struct sockaddr_pn pipe_srv = { |
54 | .spn_family = AF_PHONET, |
55 | .spn_resource = 0xD9, /* pipe service */ |
56 | }; |
57 | |
58 | #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */ |
59 | |
60 | /* Get the next TLV sub-block. */ |
61 | static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen, |
62 | void *buf) |
63 | { |
64 | void *data = NULL; |
65 | struct { |
66 | u8 sb_type; |
67 | u8 sb_len; |
68 | } *ph, h; |
69 | int buflen = *plen; |
70 | |
71 | ph = skb_header_pointer(skb, 0, 2, &h); |
72 | if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len)) |
73 | return NULL; |
74 | ph->sb_len -= 2; |
75 | *ptype = ph->sb_type; |
76 | *plen = ph->sb_len; |
77 | |
78 | if (buflen > ph->sb_len) |
79 | buflen = ph->sb_len; |
80 | data = skb_header_pointer(skb, 2, buflen, buf); |
81 | __skb_pull(skb, 2 + ph->sb_len); |
82 | return data; |
83 | } |
84 | |
85 | static int pep_reply(struct sock *sk, struct sk_buff *oskb, |
86 | u8 code, const void *data, int len, gfp_t priority) |
87 | { |
88 | const struct pnpipehdr *oph = pnp_hdr(oskb); |
89 | struct pnpipehdr *ph; |
90 | struct sk_buff *skb; |
91 | |
92 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); |
93 | if (!skb) |
94 | return -ENOMEM; |
95 | skb_set_owner_w(skb, sk); |
96 | |
97 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
98 | __skb_put(skb, len); |
99 | skb_copy_to_linear_data(skb, data, len); |
100 | __skb_push(skb, sizeof(*ph)); |
101 | skb_reset_transport_header(skb); |
102 | ph = pnp_hdr(skb); |
103 | ph->utid = oph->utid; |
104 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ |
105 | ph->pipe_handle = oph->pipe_handle; |
106 | ph->error_code = code; |
107 | |
108 | return pn_skb_send(sk, skb, &pipe_srv); |
109 | } |
110 | |
111 | #define PAD 0x00 |
112 | |
113 | #ifdef CONFIG_PHONET_PIPECTRLR |
114 | static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len) |
115 | { |
116 | int i, j; |
117 | u8 base_fc, final_fc; |
118 | |
119 | for (i = 0; i < len; i++) { |
120 | base_fc = host_fc[i]; |
121 | for (j = 0; j < len; j++) { |
122 | if (remote_fc[j] == base_fc) { |
123 | final_fc = base_fc; |
124 | goto done; |
125 | } |
126 | } |
127 | } |
128 | return -EINVAL; |
129 | |
130 | done: |
131 | return final_fc; |
132 | |
133 | } |
134 | |
135 | static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb, |
136 | u8 *pref_rx_fc, u8 *req_tx_fc) |
137 | { |
138 | struct pnpipehdr *hdr; |
139 | u8 n_sb; |
140 | |
141 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) |
142 | return -EINVAL; |
143 | |
144 | hdr = pnp_hdr(skb); |
145 | n_sb = hdr->data[4]; |
146 | |
147 | __skb_pull(skb, sizeof(*hdr) + 4); |
148 | while (n_sb > 0) { |
149 | u8 type, buf[3], len = sizeof(buf); |
150 | u8 *data = pep_get_sb(skb, &type, &len, buf); |
151 | |
152 | if (data == NULL) |
153 | return -EINVAL; |
154 | |
155 | switch (type) { |
156 | case PN_PIPE_SB_REQUIRED_FC_TX: |
157 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) |
158 | break; |
159 | req_tx_fc[0] = data[2]; |
160 | req_tx_fc[1] = data[3]; |
161 | req_tx_fc[2] = data[4]; |
162 | break; |
163 | |
164 | case PN_PIPE_SB_PREFERRED_FC_RX: |
165 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) |
166 | break; |
167 | pref_rx_fc[0] = data[2]; |
168 | pref_rx_fc[1] = data[3]; |
169 | pref_rx_fc[2] = data[4]; |
170 | break; |
171 | |
172 | } |
173 | n_sb--; |
174 | } |
175 | return 0; |
176 | } |
177 | |
178 | static int pipe_handler_send_req(struct sock *sk, u8 utid, |
179 | u8 msg_id, gfp_t priority) |
180 | { |
181 | int len; |
182 | struct pnpipehdr *ph; |
183 | struct sk_buff *skb; |
184 | struct pep_sock *pn = pep_sk(sk); |
185 | |
186 | static const u8 data[4] = { |
187 | PAD, PAD, PAD, PAD, |
188 | }; |
189 | |
190 | switch (msg_id) { |
191 | case PNS_PEP_CONNECT_REQ: |
192 | len = sizeof(data); |
193 | break; |
194 | |
195 | case PNS_PEP_DISCONNECT_REQ: |
196 | case PNS_PEP_ENABLE_REQ: |
197 | case PNS_PEP_DISABLE_REQ: |
198 | len = 0; |
199 | break; |
200 | |
201 | default: |
202 | return -EINVAL; |
203 | } |
204 | |
205 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); |
206 | if (!skb) |
207 | return -ENOMEM; |
208 | skb_set_owner_w(skb, sk); |
209 | |
210 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
211 | if (len) { |
212 | __skb_put(skb, len); |
213 | skb_copy_to_linear_data(skb, data, len); |
214 | } |
215 | __skb_push(skb, sizeof(*ph)); |
216 | skb_reset_transport_header(skb); |
217 | ph = pnp_hdr(skb); |
218 | ph->utid = utid; |
219 | ph->message_id = msg_id; |
220 | ph->pipe_handle = pn->pipe_handle; |
221 | ph->error_code = PN_PIPE_NO_ERROR; |
222 | |
223 | return pn_skb_send(sk, skb, &pn->remote_pep); |
224 | } |
225 | |
226 | static int pipe_handler_send_created_ind(struct sock *sk, |
227 | u8 utid, u8 msg_id) |
228 | { |
229 | int err_code; |
230 | struct pnpipehdr *ph; |
231 | struct sk_buff *skb; |
232 | |
233 | struct pep_sock *pn = pep_sk(sk); |
234 | static u8 data[4] = { |
235 | 0x03, 0x04, |
236 | }; |
237 | data[2] = pn->tx_fc; |
238 | data[3] = pn->rx_fc; |
239 | |
240 | /* |
241 | * actually, below is number of sub-blocks and not error code. |
242 | * Pipe_created_ind message format does not have any |
243 | * error code field. However, the Phonet stack will always send |
244 | * an error code as part of pnpipehdr. So, use that err_code to |
245 | * specify the number of sub-blocks. |
246 | */ |
247 | err_code = 0x01; |
248 | |
249 | skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC); |
250 | if (!skb) |
251 | return -ENOMEM; |
252 | skb_set_owner_w(skb, sk); |
253 | |
254 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
255 | __skb_put(skb, sizeof(data)); |
256 | skb_copy_to_linear_data(skb, data, sizeof(data)); |
257 | __skb_push(skb, sizeof(*ph)); |
258 | skb_reset_transport_header(skb); |
259 | ph = pnp_hdr(skb); |
260 | ph->utid = utid; |
261 | ph->message_id = msg_id; |
262 | ph->pipe_handle = pn->pipe_handle; |
263 | ph->error_code = err_code; |
264 | |
265 | return pn_skb_send(sk, skb, &pn->remote_pep); |
266 | } |
267 | |
268 | static int pipe_handler_send_ind(struct sock *sk, u8 utid, u8 msg_id) |
269 | { |
270 | int err_code; |
271 | struct pnpipehdr *ph; |
272 | struct sk_buff *skb; |
273 | struct pep_sock *pn = pep_sk(sk); |
274 | |
275 | /* |
276 | * actually, below is a filler. |
277 | * Pipe_enabled/disabled_ind message format does not have any |
278 | * error code field. However, the Phonet stack will always send |
279 | * an error code as part of pnpipehdr. So, use that err_code to |
280 | * specify the filler value. |
281 | */ |
282 | err_code = 0x0; |
283 | |
284 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
285 | if (!skb) |
286 | return -ENOMEM; |
287 | skb_set_owner_w(skb, sk); |
288 | |
289 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
290 | __skb_push(skb, sizeof(*ph)); |
291 | skb_reset_transport_header(skb); |
292 | ph = pnp_hdr(skb); |
293 | ph->utid = utid; |
294 | ph->message_id = msg_id; |
295 | ph->pipe_handle = pn->pipe_handle; |
296 | ph->error_code = err_code; |
297 | |
298 | return pn_skb_send(sk, skb, &pn->remote_pep); |
299 | } |
300 | |
301 | static int pipe_handler_enable_pipe(struct sock *sk, int enable) |
302 | { |
303 | int utid, req; |
304 | |
305 | if (enable) { |
306 | utid = PNS_PIPE_ENABLE_UTID; |
307 | req = PNS_PEP_ENABLE_REQ; |
308 | } else { |
309 | utid = PNS_PIPE_DISABLE_UTID; |
310 | req = PNS_PEP_DISABLE_REQ; |
311 | } |
312 | return pipe_handler_send_req(sk, utid, req, GFP_ATOMIC); |
313 | } |
314 | #endif |
315 | |
316 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
317 | { |
318 | static const u8 data[20] = { |
319 | PAD, PAD, PAD, 2 /* sub-blocks */, |
320 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, |
321 | PN_MULTI_CREDIT_FLOW_CONTROL, |
322 | PN_ONE_CREDIT_FLOW_CONTROL, |
323 | PN_LEGACY_FLOW_CONTROL, |
324 | PAD, |
325 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, |
326 | PN_MULTI_CREDIT_FLOW_CONTROL, |
327 | PN_ONE_CREDIT_FLOW_CONTROL, |
328 | PN_LEGACY_FLOW_CONTROL, |
329 | PAD, |
330 | }; |
331 | |
332 | might_sleep(); |
333 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), |
334 | GFP_KERNEL); |
335 | } |
336 | |
337 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code) |
338 | { |
339 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; |
340 | WARN_ON(code == PN_PIPE_NO_ERROR); |
341 | return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC); |
342 | } |
343 | |
344 | /* Control requests are not sent by the pipe service and have a specific |
345 | * message format. */ |
346 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
347 | gfp_t priority) |
348 | { |
349 | const struct pnpipehdr *oph = pnp_hdr(oskb); |
350 | struct sk_buff *skb; |
351 | struct pnpipehdr *ph; |
352 | struct sockaddr_pn dst; |
353 | |
354 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); |
355 | if (!skb) |
356 | return -ENOMEM; |
357 | skb_set_owner_w(skb, sk); |
358 | |
359 | skb_reserve(skb, MAX_PHONET_HEADER); |
360 | ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4); |
361 | |
362 | ph->utid = oph->utid; |
363 | ph->message_id = PNS_PEP_CTRL_RESP; |
364 | ph->pipe_handle = oph->pipe_handle; |
365 | ph->data[0] = oph->data[1]; /* CTRL id */ |
366 | ph->data[1] = oph->data[0]; /* PEP type */ |
367 | ph->data[2] = code; /* error code, at an usual offset */ |
368 | ph->data[3] = PAD; |
369 | ph->data[4] = PAD; |
370 | |
371 | pn_skb_get_src_sockaddr(oskb, &dst); |
372 | return pn_skb_send(sk, skb, &dst); |
373 | } |
374 | |
375 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) |
376 | { |
377 | struct pep_sock *pn = pep_sk(sk); |
378 | struct pnpipehdr *ph; |
379 | struct sk_buff *skb; |
380 | |
381 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); |
382 | if (!skb) |
383 | return -ENOMEM; |
384 | skb_set_owner_w(skb, sk); |
385 | |
386 | skb_reserve(skb, MAX_PNPIPE_HEADER + 4); |
387 | __skb_push(skb, sizeof(*ph) + 4); |
388 | skb_reset_transport_header(skb); |
389 | ph = pnp_hdr(skb); |
390 | ph->utid = 0; |
391 | ph->message_id = PNS_PEP_STATUS_IND; |
392 | ph->pipe_handle = pn->pipe_handle; |
393 | ph->pep_type = PN_PEP_TYPE_COMMON; |
394 | ph->data[1] = type; |
395 | ph->data[2] = PAD; |
396 | ph->data[3] = PAD; |
397 | ph->data[4] = status; |
398 | |
399 | #ifdef CONFIG_PHONET_PIPECTRLR |
400 | return pn_skb_send(sk, skb, &pn->remote_pep); |
401 | #else |
402 | return pn_skb_send(sk, skb, &pipe_srv); |
403 | #endif |
404 | } |
405 | |
406 | /* Send our RX flow control information to the sender. |
407 | * Socket must be locked. */ |
408 | static void pipe_grant_credits(struct sock *sk) |
409 | { |
410 | struct pep_sock *pn = pep_sk(sk); |
411 | |
412 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); |
413 | |
414 | switch (pn->rx_fc) { |
415 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ |
416 | break; |
417 | case PN_ONE_CREDIT_FLOW_CONTROL: |
418 | pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, |
419 | PEP_IND_READY, GFP_ATOMIC); |
420 | pn->rx_credits = 1; |
421 | break; |
422 | case PN_MULTI_CREDIT_FLOW_CONTROL: |
423 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) |
424 | break; |
425 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, |
426 | CREDITS_MAX - pn->rx_credits, |
427 | GFP_ATOMIC) == 0) |
428 | pn->rx_credits = CREDITS_MAX; |
429 | break; |
430 | } |
431 | } |
432 | |
433 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) |
434 | { |
435 | struct pep_sock *pn = pep_sk(sk); |
436 | struct pnpipehdr *hdr; |
437 | int wake = 0; |
438 | |
439 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) |
440 | return -EINVAL; |
441 | |
442 | hdr = pnp_hdr(skb); |
443 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
444 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", |
445 | (unsigned)hdr->data[0]); |
446 | return -EOPNOTSUPP; |
447 | } |
448 | |
449 | switch (hdr->data[1]) { |
450 | case PN_PEP_IND_FLOW_CONTROL: |
451 | switch (pn->tx_fc) { |
452 | case PN_LEGACY_FLOW_CONTROL: |
453 | switch (hdr->data[4]) { |
454 | case PEP_IND_BUSY: |
455 | atomic_set(&pn->tx_credits, 0); |
456 | break; |
457 | case PEP_IND_READY: |
458 | atomic_set(&pn->tx_credits, wake = 1); |
459 | break; |
460 | } |
461 | break; |
462 | case PN_ONE_CREDIT_FLOW_CONTROL: |
463 | if (hdr->data[4] == PEP_IND_READY) |
464 | atomic_set(&pn->tx_credits, wake = 1); |
465 | break; |
466 | } |
467 | break; |
468 | |
469 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: |
470 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) |
471 | break; |
472 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
473 | break; |
474 | |
475 | default: |
476 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", |
477 | (unsigned)hdr->data[1]); |
478 | return -EOPNOTSUPP; |
479 | } |
480 | if (wake) |
481 | sk->sk_write_space(sk); |
482 | return 0; |
483 | } |
484 | |
485 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) |
486 | { |
487 | struct pep_sock *pn = pep_sk(sk); |
488 | struct pnpipehdr *hdr = pnp_hdr(skb); |
489 | u8 n_sb = hdr->data[0]; |
490 | |
491 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
492 | __skb_pull(skb, sizeof(*hdr)); |
493 | while (n_sb > 0) { |
494 | u8 type, buf[2], len = sizeof(buf); |
495 | u8 *data = pep_get_sb(skb, &type, &len, buf); |
496 | |
497 | if (data == NULL) |
498 | return -EINVAL; |
499 | switch (type) { |
500 | case PN_PIPE_SB_NEGOTIATED_FC: |
501 | if (len < 2 || (data[0] | data[1]) > 3) |
502 | break; |
503 | pn->tx_fc = data[0] & 3; |
504 | pn->rx_fc = data[1] & 3; |
505 | break; |
506 | } |
507 | n_sb--; |
508 | } |
509 | return 0; |
510 | } |
511 | |
512 | /* Queue an skb to a connected sock. |
513 | * Socket lock must be held. */ |
514 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) |
515 | { |
516 | struct pep_sock *pn = pep_sk(sk); |
517 | struct pnpipehdr *hdr = pnp_hdr(skb); |
518 | struct sk_buff_head *queue; |
519 | int err = 0; |
520 | |
521 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); |
522 | |
523 | switch (hdr->message_id) { |
524 | case PNS_PEP_CONNECT_REQ: |
525 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); |
526 | break; |
527 | |
528 | case PNS_PEP_DISCONNECT_REQ: |
529 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
530 | sk->sk_state = TCP_CLOSE_WAIT; |
531 | if (!sock_flag(sk, SOCK_DEAD)) |
532 | sk->sk_state_change(sk); |
533 | break; |
534 | |
535 | #ifdef CONFIG_PHONET_PIPECTRLR |
536 | case PNS_PEP_DISCONNECT_RESP: |
537 | pn->pipe_state = PIPE_IDLE; |
538 | sk->sk_state = TCP_CLOSE; |
539 | break; |
540 | #endif |
541 | |
542 | case PNS_PEP_ENABLE_REQ: |
543 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ |
544 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
545 | break; |
546 | |
547 | #ifdef CONFIG_PHONET_PIPECTRLR |
548 | case PNS_PEP_ENABLE_RESP: |
549 | pn->pipe_state = PIPE_ENABLED; |
550 | pipe_handler_send_ind(sk, PNS_PIPE_ENABLED_IND_UTID, |
551 | PNS_PIPE_ENABLED_IND); |
552 | |
553 | if (!pn_flow_safe(pn->tx_fc)) { |
554 | atomic_set(&pn->tx_credits, 1); |
555 | sk->sk_write_space(sk); |
556 | } |
557 | if (sk->sk_state == TCP_ESTABLISHED) |
558 | break; /* Nothing to do */ |
559 | sk->sk_state = TCP_ESTABLISHED; |
560 | pipe_grant_credits(sk); |
561 | break; |
562 | #endif |
563 | |
564 | case PNS_PEP_RESET_REQ: |
565 | switch (hdr->state_after_reset) { |
566 | case PN_PIPE_DISABLE: |
567 | pn->init_enable = 0; |
568 | break; |
569 | case PN_PIPE_ENABLE: |
570 | pn->init_enable = 1; |
571 | break; |
572 | default: /* not allowed to send an error here!? */ |
573 | err = -EINVAL; |
574 | goto out; |
575 | } |
576 | /* fall through */ |
577 | case PNS_PEP_DISABLE_REQ: |
578 | atomic_set(&pn->tx_credits, 0); |
579 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
580 | break; |
581 | |
582 | #ifdef CONFIG_PHONET_PIPECTRLR |
583 | case PNS_PEP_DISABLE_RESP: |
584 | pn->pipe_state = PIPE_DISABLED; |
585 | atomic_set(&pn->tx_credits, 0); |
586 | pipe_handler_send_ind(sk, PNS_PIPE_DISABLED_IND_UTID, |
587 | PNS_PIPE_DISABLED_IND); |
588 | sk->sk_state = TCP_SYN_RECV; |
589 | pn->rx_credits = 0; |
590 | break; |
591 | #endif |
592 | |
593 | case PNS_PEP_CTRL_REQ: |
594 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
595 | atomic_inc(&sk->sk_drops); |
596 | break; |
597 | } |
598 | __skb_pull(skb, 4); |
599 | queue = &pn->ctrlreq_queue; |
600 | goto queue; |
601 | |
602 | case PNS_PIPE_ALIGNED_DATA: |
603 | __skb_pull(skb, 1); |
604 | /* fall through */ |
605 | case PNS_PIPE_DATA: |
606 | __skb_pull(skb, 3); /* Pipe data header */ |
607 | if (!pn_flow_safe(pn->rx_fc)) { |
608 | err = sock_queue_rcv_skb(sk, skb); |
609 | if (!err) |
610 | return 0; |
611 | break; |
612 | } |
613 | |
614 | if (pn->rx_credits == 0) { |
615 | atomic_inc(&sk->sk_drops); |
616 | err = -ENOBUFS; |
617 | break; |
618 | } |
619 | pn->rx_credits--; |
620 | queue = &sk->sk_receive_queue; |
621 | goto queue; |
622 | |
623 | case PNS_PEP_STATUS_IND: |
624 | pipe_rcv_status(sk, skb); |
625 | break; |
626 | |
627 | case PNS_PIPE_REDIRECTED_IND: |
628 | err = pipe_rcv_created(sk, skb); |
629 | break; |
630 | |
631 | case PNS_PIPE_CREATED_IND: |
632 | err = pipe_rcv_created(sk, skb); |
633 | if (err) |
634 | break; |
635 | /* fall through */ |
636 | case PNS_PIPE_RESET_IND: |
637 | if (!pn->init_enable) |
638 | break; |
639 | /* fall through */ |
640 | case PNS_PIPE_ENABLED_IND: |
641 | if (!pn_flow_safe(pn->tx_fc)) { |
642 | atomic_set(&pn->tx_credits, 1); |
643 | sk->sk_write_space(sk); |
644 | } |
645 | if (sk->sk_state == TCP_ESTABLISHED) |
646 | break; /* Nothing to do */ |
647 | sk->sk_state = TCP_ESTABLISHED; |
648 | pipe_grant_credits(sk); |
649 | break; |
650 | |
651 | case PNS_PIPE_DISABLED_IND: |
652 | sk->sk_state = TCP_SYN_RECV; |
653 | pn->rx_credits = 0; |
654 | break; |
655 | |
656 | default: |
657 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", |
658 | hdr->message_id); |
659 | err = -EINVAL; |
660 | } |
661 | out: |
662 | kfree_skb(skb); |
663 | return err; |
664 | |
665 | queue: |
666 | skb->dev = NULL; |
667 | skb_set_owner_r(skb, sk); |
668 | err = skb->len; |
669 | skb_queue_tail(queue, skb); |
670 | if (!sock_flag(sk, SOCK_DEAD)) |
671 | sk->sk_data_ready(sk, err); |
672 | return 0; |
673 | } |
674 | |
675 | /* Destroy connected sock. */ |
676 | static void pipe_destruct(struct sock *sk) |
677 | { |
678 | struct pep_sock *pn = pep_sk(sk); |
679 | |
680 | skb_queue_purge(&sk->sk_receive_queue); |
681 | skb_queue_purge(&pn->ctrlreq_queue); |
682 | } |
683 | |
684 | #ifdef CONFIG_PHONET_PIPECTRLR |
685 | static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb) |
686 | { |
687 | struct pep_sock *pn = pep_sk(sk); |
688 | u8 host_pref_rx_fc[3] = {3, 2, 1}, host_req_tx_fc[3] = {3, 2, 1}; |
689 | u8 remote_pref_rx_fc[3], remote_req_tx_fc[3]; |
690 | u8 negotiated_rx_fc, negotiated_tx_fc; |
691 | int ret; |
692 | |
693 | pipe_get_flow_info(sk, skb, remote_pref_rx_fc, |
694 | remote_req_tx_fc); |
695 | negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc, |
696 | host_pref_rx_fc, |
697 | sizeof(host_pref_rx_fc)); |
698 | negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc, |
699 | remote_pref_rx_fc, |
700 | sizeof(host_pref_rx_fc)); |
701 | |
702 | pn->pipe_state = PIPE_DISABLED; |
703 | sk->sk_state = TCP_SYN_RECV; |
704 | sk->sk_backlog_rcv = pipe_do_rcv; |
705 | sk->sk_destruct = pipe_destruct; |
706 | pn->rx_credits = 0; |
707 | pn->rx_fc = negotiated_rx_fc; |
708 | pn->tx_fc = negotiated_tx_fc; |
709 | sk->sk_state_change(sk); |
710 | |
711 | ret = pipe_handler_send_created_ind(sk, |
712 | PNS_PIPE_CREATED_IND_UTID, |
713 | PNS_PIPE_CREATED_IND |
714 | ); |
715 | |
716 | return ret; |
717 | } |
718 | #endif |
719 | |
720 | static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) |
721 | { |
722 | struct sock *newsk; |
723 | struct pep_sock *newpn, *pn = pep_sk(sk); |
724 | struct pnpipehdr *hdr; |
725 | struct sockaddr_pn dst; |
726 | u16 peer_type; |
727 | u8 pipe_handle, enabled, n_sb; |
728 | u8 aligned = 0; |
729 | |
730 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) |
731 | return -EINVAL; |
732 | |
733 | hdr = pnp_hdr(skb); |
734 | pipe_handle = hdr->pipe_handle; |
735 | switch (hdr->state_after_connect) { |
736 | case PN_PIPE_DISABLE: |
737 | enabled = 0; |
738 | break; |
739 | case PN_PIPE_ENABLE: |
740 | enabled = 1; |
741 | break; |
742 | default: |
743 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM); |
744 | return -EINVAL; |
745 | } |
746 | peer_type = hdr->other_pep_type << 8; |
747 | |
748 | if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) { |
749 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); |
750 | return -ENOBUFS; |
751 | } |
752 | |
753 | /* Parse sub-blocks (options) */ |
754 | n_sb = hdr->data[4]; |
755 | while (n_sb > 0) { |
756 | u8 type, buf[1], len = sizeof(buf); |
757 | const u8 *data = pep_get_sb(skb, &type, &len, buf); |
758 | |
759 | if (data == NULL) |
760 | return -EINVAL; |
761 | switch (type) { |
762 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: |
763 | if (len < 1) |
764 | return -EINVAL; |
765 | peer_type = (peer_type & 0xff00) | data[0]; |
766 | break; |
767 | case PN_PIPE_SB_ALIGNED_DATA: |
768 | aligned = data[0] != 0; |
769 | break; |
770 | } |
771 | n_sb--; |
772 | } |
773 | |
774 | skb = skb_clone(skb, GFP_ATOMIC); |
775 | if (!skb) |
776 | return -ENOMEM; |
777 | |
778 | /* Create a new to-be-accepted sock */ |
779 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot); |
780 | if (!newsk) { |
781 | kfree_skb(skb); |
782 | return -ENOMEM; |
783 | } |
784 | sock_init_data(NULL, newsk); |
785 | newsk->sk_state = TCP_SYN_RECV; |
786 | newsk->sk_backlog_rcv = pipe_do_rcv; |
787 | newsk->sk_protocol = sk->sk_protocol; |
788 | newsk->sk_destruct = pipe_destruct; |
789 | |
790 | newpn = pep_sk(newsk); |
791 | pn_skb_get_dst_sockaddr(skb, &dst); |
792 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); |
793 | newpn->pn_sk.resource = pn->pn_sk.resource; |
794 | skb_queue_head_init(&newpn->ctrlreq_queue); |
795 | newpn->pipe_handle = pipe_handle; |
796 | atomic_set(&newpn->tx_credits, 0); |
797 | newpn->peer_type = peer_type; |
798 | newpn->rx_credits = 0; |
799 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
800 | newpn->init_enable = enabled; |
801 | newpn->aligned = aligned; |
802 | |
803 | BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue)); |
804 | skb_queue_head(&newsk->sk_receive_queue, skb); |
805 | if (!sock_flag(sk, SOCK_DEAD)) |
806 | sk->sk_data_ready(sk, 0); |
807 | |
808 | sk_acceptq_added(sk); |
809 | sk_add_node(newsk, &pn->ackq); |
810 | return 0; |
811 | } |
812 | |
813 | /* Listening sock must be locked */ |
814 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, |
815 | const struct sockaddr_pn *dst, |
816 | u8 pipe_handle) |
817 | { |
818 | struct hlist_node *node; |
819 | struct sock *sknode; |
820 | u16 dobj = pn_sockaddr_get_object(dst); |
821 | |
822 | sk_for_each(sknode, node, hlist) { |
823 | struct pep_sock *pnnode = pep_sk(sknode); |
824 | |
825 | /* Ports match, but addresses might not: */ |
826 | if (pnnode->pn_sk.sobject != dobj) |
827 | continue; |
828 | if (pnnode->pipe_handle != pipe_handle) |
829 | continue; |
830 | if (sknode->sk_state == TCP_CLOSE_WAIT) |
831 | continue; |
832 | |
833 | sock_hold(sknode); |
834 | return sknode; |
835 | } |
836 | return NULL; |
837 | } |
838 | |
839 | /* |
840 | * Deliver an skb to a listening sock. |
841 | * Socket lock must be held. |
842 | * We then queue the skb to the right connected sock (if any). |
843 | */ |
844 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) |
845 | { |
846 | struct pep_sock *pn = pep_sk(sk); |
847 | struct sock *sknode; |
848 | struct pnpipehdr *hdr; |
849 | struct sockaddr_pn dst; |
850 | int err = NET_RX_SUCCESS; |
851 | u8 pipe_handle; |
852 | |
853 | if (!pskb_may_pull(skb, sizeof(*hdr))) |
854 | goto drop; |
855 | |
856 | hdr = pnp_hdr(skb); |
857 | pipe_handle = hdr->pipe_handle; |
858 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) |
859 | goto drop; |
860 | |
861 | pn_skb_get_dst_sockaddr(skb, &dst); |
862 | |
863 | /* Look for an existing pipe handle */ |
864 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); |
865 | if (sknode) |
866 | return sk_receive_skb(sknode, skb, 1); |
867 | |
868 | /* Look for a pipe handle pending accept */ |
869 | sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle); |
870 | if (sknode) { |
871 | sock_put(sknode); |
872 | if (net_ratelimit()) |
873 | printk(KERN_WARNING"Phonet unconnected PEP ignored"); |
874 | err = NET_RX_DROP; |
875 | goto drop; |
876 | } |
877 | |
878 | switch (hdr->message_id) { |
879 | case PNS_PEP_CONNECT_REQ: |
880 | err = pep_connreq_rcv(sk, skb); |
881 | break; |
882 | |
883 | #ifdef CONFIG_PHONET_PIPECTRLR |
884 | case PNS_PEP_CONNECT_RESP: |
885 | err = pep_connresp_rcv(sk, skb); |
886 | break; |
887 | #endif |
888 | |
889 | case PNS_PEP_DISCONNECT_REQ: |
890 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
891 | break; |
892 | |
893 | case PNS_PEP_CTRL_REQ: |
894 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
895 | break; |
896 | |
897 | case PNS_PEP_RESET_REQ: |
898 | case PNS_PEP_ENABLE_REQ: |
899 | case PNS_PEP_DISABLE_REQ: |
900 | /* invalid handle is not even allowed here! */ |
901 | default: |
902 | err = NET_RX_DROP; |
903 | } |
904 | drop: |
905 | kfree_skb(skb); |
906 | return err; |
907 | } |
908 | |
909 | static int pipe_do_remove(struct sock *sk) |
910 | { |
911 | struct pep_sock *pn = pep_sk(sk); |
912 | struct pnpipehdr *ph; |
913 | struct sk_buff *skb; |
914 | |
915 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL); |
916 | if (!skb) |
917 | return -ENOMEM; |
918 | |
919 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
920 | __skb_push(skb, sizeof(*ph)); |
921 | skb_reset_transport_header(skb); |
922 | ph = pnp_hdr(skb); |
923 | ph->utid = 0; |
924 | ph->message_id = PNS_PIPE_REMOVE_REQ; |
925 | ph->pipe_handle = pn->pipe_handle; |
926 | ph->data[0] = PAD; |
927 | |
928 | return pn_skb_send(sk, skb, &pipe_srv); |
929 | } |
930 | |
931 | /* associated socket ceases to exist */ |
932 | static void pep_sock_close(struct sock *sk, long timeout) |
933 | { |
934 | struct pep_sock *pn = pep_sk(sk); |
935 | int ifindex = 0; |
936 | |
937 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
938 | sk_common_release(sk); |
939 | |
940 | lock_sock(sk); |
941 | if (sk->sk_state == TCP_LISTEN) { |
942 | /* Destroy the listen queue */ |
943 | struct sock *sknode; |
944 | struct hlist_node *p, *n; |
945 | |
946 | sk_for_each_safe(sknode, p, n, &pn->ackq) |
947 | sk_del_node_init(sknode); |
948 | sk->sk_state = TCP_CLOSE; |
949 | } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
950 | /* Forcefully remove dangling Phonet pipe */ |
951 | pipe_do_remove(sk); |
952 | |
953 | #ifdef CONFIG_PHONET_PIPECTRLR |
954 | if (pn->pipe_state != PIPE_IDLE) { |
955 | /* send pep disconnect request */ |
956 | pipe_handler_send_req(sk, |
957 | PNS_PEP_DISCONNECT_UTID, PNS_PEP_DISCONNECT_REQ, |
958 | GFP_KERNEL); |
959 | |
960 | pn->pipe_state = PIPE_IDLE; |
961 | sk->sk_state = TCP_CLOSE; |
962 | } |
963 | #endif |
964 | |
965 | ifindex = pn->ifindex; |
966 | pn->ifindex = 0; |
967 | release_sock(sk); |
968 | |
969 | if (ifindex) |
970 | gprs_detach(sk); |
971 | sock_put(sk); |
972 | } |
973 | |
974 | static int pep_wait_connreq(struct sock *sk, int noblock) |
975 | { |
976 | struct task_struct *tsk = current; |
977 | struct pep_sock *pn = pep_sk(sk); |
978 | long timeo = sock_rcvtimeo(sk, noblock); |
979 | |
980 | for (;;) { |
981 | DEFINE_WAIT(wait); |
982 | |
983 | if (sk->sk_state != TCP_LISTEN) |
984 | return -EINVAL; |
985 | if (!hlist_empty(&pn->ackq)) |
986 | break; |
987 | if (!timeo) |
988 | return -EWOULDBLOCK; |
989 | if (signal_pending(tsk)) |
990 | return sock_intr_errno(timeo); |
991 | |
992 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
993 | TASK_INTERRUPTIBLE); |
994 | release_sock(sk); |
995 | timeo = schedule_timeout(timeo); |
996 | lock_sock(sk); |
997 | finish_wait(sk_sleep(sk), &wait); |
998 | } |
999 | |
1000 | return 0; |
1001 | } |
1002 | |
1003 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) |
1004 | { |
1005 | struct pep_sock *pn = pep_sk(sk); |
1006 | struct sock *newsk = NULL; |
1007 | struct sk_buff *oskb; |
1008 | int err; |
1009 | |
1010 | lock_sock(sk); |
1011 | err = pep_wait_connreq(sk, flags & O_NONBLOCK); |
1012 | if (err) |
1013 | goto out; |
1014 | |
1015 | newsk = __sk_head(&pn->ackq); |
1016 | |
1017 | oskb = skb_dequeue(&newsk->sk_receive_queue); |
1018 | err = pep_accept_conn(newsk, oskb); |
1019 | if (err) { |
1020 | skb_queue_head(&newsk->sk_receive_queue, oskb); |
1021 | newsk = NULL; |
1022 | goto out; |
1023 | } |
1024 | kfree_skb(oskb); |
1025 | |
1026 | sock_hold(sk); |
1027 | pep_sk(newsk)->listener = sk; |
1028 | |
1029 | sock_hold(newsk); |
1030 | sk_del_node_init(newsk); |
1031 | sk_acceptq_removed(sk); |
1032 | sk_add_node(newsk, &pn->hlist); |
1033 | __sock_put(newsk); |
1034 | |
1035 | out: |
1036 | release_sock(sk); |
1037 | *errp = err; |
1038 | return newsk; |
1039 | } |
1040 | |
1041 | #ifdef CONFIG_PHONET_PIPECTRLR |
1042 | static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len) |
1043 | { |
1044 | struct pep_sock *pn = pep_sk(sk); |
1045 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
1046 | |
1047 | memcpy(&pn->remote_pep, spn, sizeof(struct sockaddr_pn)); |
1048 | |
1049 | return pipe_handler_send_req(sk, |
1050 | PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ, |
1051 | GFP_ATOMIC); |
1052 | } |
1053 | #endif |
1054 | |
1055 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1056 | { |
1057 | struct pep_sock *pn = pep_sk(sk); |
1058 | int answ; |
1059 | |
1060 | switch (cmd) { |
1061 | case SIOCINQ: |
1062 | if (sk->sk_state == TCP_LISTEN) |
1063 | return -EINVAL; |
1064 | |
1065 | lock_sock(sk); |
1066 | if (sock_flag(sk, SOCK_URGINLINE) && |
1067 | !skb_queue_empty(&pn->ctrlreq_queue)) |
1068 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
1069 | else if (!skb_queue_empty(&sk->sk_receive_queue)) |
1070 | answ = skb_peek(&sk->sk_receive_queue)->len; |
1071 | else |
1072 | answ = 0; |
1073 | release_sock(sk); |
1074 | return put_user(answ, (int __user *)arg); |
1075 | } |
1076 | |
1077 | return -ENOIOCTLCMD; |
1078 | } |
1079 | |
1080 | static int pep_init(struct sock *sk) |
1081 | { |
1082 | struct pep_sock *pn = pep_sk(sk); |
1083 | |
1084 | INIT_HLIST_HEAD(&pn->ackq); |
1085 | INIT_HLIST_HEAD(&pn->hlist); |
1086 | skb_queue_head_init(&pn->ctrlreq_queue); |
1087 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
1088 | return 0; |
1089 | } |
1090 | |
1091 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
1092 | char __user *optval, unsigned int optlen) |
1093 | { |
1094 | struct pep_sock *pn = pep_sk(sk); |
1095 | int val = 0, err = 0; |
1096 | |
1097 | if (level != SOL_PNPIPE) |
1098 | return -ENOPROTOOPT; |
1099 | if (optlen >= sizeof(int)) { |
1100 | if (get_user(val, (int __user *) optval)) |
1101 | return -EFAULT; |
1102 | } |
1103 | |
1104 | lock_sock(sk); |
1105 | switch (optname) { |
1106 | #ifdef CONFIG_PHONET_PIPECTRLR |
1107 | case PNPIPE_PIPE_HANDLE: |
1108 | if (val) { |
1109 | if (pn->pipe_state > PIPE_IDLE) { |
1110 | err = -EFAULT; |
1111 | break; |
1112 | } |
1113 | pn->pipe_handle = val; |
1114 | break; |
1115 | } |
1116 | #endif |
1117 | |
1118 | case PNPIPE_ENCAP: |
1119 | if (val && val != PNPIPE_ENCAP_IP) { |
1120 | err = -EINVAL; |
1121 | break; |
1122 | } |
1123 | if (!pn->ifindex == !val) |
1124 | break; /* Nothing to do! */ |
1125 | if (!capable(CAP_NET_ADMIN)) { |
1126 | err = -EPERM; |
1127 | break; |
1128 | } |
1129 | if (val) { |
1130 | release_sock(sk); |
1131 | err = gprs_attach(sk); |
1132 | if (err > 0) { |
1133 | pn->ifindex = err; |
1134 | err = 0; |
1135 | } |
1136 | } else { |
1137 | pn->ifindex = 0; |
1138 | release_sock(sk); |
1139 | gprs_detach(sk); |
1140 | err = 0; |
1141 | } |
1142 | goto out_norel; |
1143 | |
1144 | #ifdef CONFIG_PHONET_PIPECTRLR |
1145 | case PNPIPE_ENABLE: |
1146 | if (pn->pipe_state <= PIPE_IDLE) { |
1147 | err = -ENOTCONN; |
1148 | break; |
1149 | } |
1150 | err = pipe_handler_enable_pipe(sk, val); |
1151 | break; |
1152 | #endif |
1153 | |
1154 | default: |
1155 | err = -ENOPROTOOPT; |
1156 | } |
1157 | release_sock(sk); |
1158 | |
1159 | out_norel: |
1160 | return err; |
1161 | } |
1162 | |
1163 | static int pep_getsockopt(struct sock *sk, int level, int optname, |
1164 | char __user *optval, int __user *optlen) |
1165 | { |
1166 | struct pep_sock *pn = pep_sk(sk); |
1167 | int len, val; |
1168 | |
1169 | if (level != SOL_PNPIPE) |
1170 | return -ENOPROTOOPT; |
1171 | if (get_user(len, optlen)) |
1172 | return -EFAULT; |
1173 | |
1174 | switch (optname) { |
1175 | case PNPIPE_ENCAP: |
1176 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; |
1177 | break; |
1178 | |
1179 | case PNPIPE_IFINDEX: |
1180 | val = pn->ifindex; |
1181 | break; |
1182 | |
1183 | #ifdef CONFIG_PHONET_PIPECTRLR |
1184 | case PNPIPE_ENABLE: |
1185 | if (pn->pipe_state <= PIPE_IDLE) |
1186 | return -ENOTCONN; |
1187 | val = pn->pipe_state != PIPE_DISABLED; |
1188 | break; |
1189 | #endif |
1190 | |
1191 | default: |
1192 | return -ENOPROTOOPT; |
1193 | } |
1194 | |
1195 | len = min_t(unsigned int, sizeof(int), len); |
1196 | if (put_user(len, optlen)) |
1197 | return -EFAULT; |
1198 | if (put_user(val, (int __user *) optval)) |
1199 | return -EFAULT; |
1200 | return 0; |
1201 | } |
1202 | |
1203 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) |
1204 | { |
1205 | struct pep_sock *pn = pep_sk(sk); |
1206 | struct pnpipehdr *ph; |
1207 | int err; |
1208 | |
1209 | if (pn_flow_safe(pn->tx_fc) && |
1210 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { |
1211 | kfree_skb(skb); |
1212 | return -ENOBUFS; |
1213 | } |
1214 | |
1215 | skb_push(skb, 3 + pn->aligned); |
1216 | skb_reset_transport_header(skb); |
1217 | ph = pnp_hdr(skb); |
1218 | ph->utid = 0; |
1219 | if (pn->aligned) { |
1220 | ph->message_id = PNS_PIPE_ALIGNED_DATA; |
1221 | ph->data[0] = 0; /* padding */ |
1222 | } else |
1223 | ph->message_id = PNS_PIPE_DATA; |
1224 | ph->pipe_handle = pn->pipe_handle; |
1225 | #ifdef CONFIG_PHONET_PIPECTRLR |
1226 | err = pn_skb_send(sk, skb, &pn->remote_pep); |
1227 | #else |
1228 | err = pn_skb_send(sk, skb, &pipe_srv); |
1229 | #endif |
1230 | |
1231 | if (err && pn_flow_safe(pn->tx_fc)) |
1232 | atomic_inc(&pn->tx_credits); |
1233 | return err; |
1234 | |
1235 | } |
1236 | |
1237 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
1238 | struct msghdr *msg, size_t len) |
1239 | { |
1240 | struct pep_sock *pn = pep_sk(sk); |
1241 | struct sk_buff *skb; |
1242 | long timeo; |
1243 | int flags = msg->msg_flags; |
1244 | int err, done; |
1245 | |
1246 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
1247 | MSG_CMSG_COMPAT)) || |
1248 | !(msg->msg_flags & MSG_EOR)) |
1249 | return -EOPNOTSUPP; |
1250 | |
1251 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
1252 | flags & MSG_DONTWAIT, &err); |
1253 | if (!skb) |
1254 | return err; |
1255 | |
1256 | skb_reserve(skb, MAX_PHONET_HEADER + 3); |
1257 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1258 | if (err < 0) |
1259 | goto outfree; |
1260 | |
1261 | lock_sock(sk); |
1262 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
1263 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { |
1264 | err = -ENOTCONN; |
1265 | goto out; |
1266 | } |
1267 | if (sk->sk_state != TCP_ESTABLISHED) { |
1268 | /* Wait until the pipe gets to enabled state */ |
1269 | disabled: |
1270 | err = sk_stream_wait_connect(sk, &timeo); |
1271 | if (err) |
1272 | goto out; |
1273 | |
1274 | if (sk->sk_state == TCP_CLOSE_WAIT) { |
1275 | err = -ECONNRESET; |
1276 | goto out; |
1277 | } |
1278 | } |
1279 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); |
1280 | |
1281 | /* Wait until flow control allows TX */ |
1282 | done = atomic_read(&pn->tx_credits); |
1283 | while (!done) { |
1284 | DEFINE_WAIT(wait); |
1285 | |
1286 | if (!timeo) { |
1287 | err = -EAGAIN; |
1288 | goto out; |
1289 | } |
1290 | if (signal_pending(current)) { |
1291 | err = sock_intr_errno(timeo); |
1292 | goto out; |
1293 | } |
1294 | |
1295 | prepare_to_wait(sk_sleep(sk), &wait, |
1296 | TASK_INTERRUPTIBLE); |
1297 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
1298 | finish_wait(sk_sleep(sk), &wait); |
1299 | |
1300 | if (sk->sk_state != TCP_ESTABLISHED) |
1301 | goto disabled; |
1302 | } |
1303 | |
1304 | err = pipe_skb_send(sk, skb); |
1305 | if (err >= 0) |
1306 | err = len; /* success! */ |
1307 | skb = NULL; |
1308 | out: |
1309 | release_sock(sk); |
1310 | outfree: |
1311 | kfree_skb(skb); |
1312 | return err; |
1313 | } |
1314 | |
1315 | int pep_writeable(struct sock *sk) |
1316 | { |
1317 | struct pep_sock *pn = pep_sk(sk); |
1318 | |
1319 | return atomic_read(&pn->tx_credits); |
1320 | } |
1321 | |
1322 | int pep_write(struct sock *sk, struct sk_buff *skb) |
1323 | { |
1324 | struct sk_buff *rskb, *fs; |
1325 | int flen = 0; |
1326 | |
1327 | if (pep_sk(sk)->aligned) |
1328 | return pipe_skb_send(sk, skb); |
1329 | |
1330 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
1331 | if (!rskb) { |
1332 | kfree_skb(skb); |
1333 | return -ENOMEM; |
1334 | } |
1335 | skb_shinfo(rskb)->frag_list = skb; |
1336 | rskb->len += skb->len; |
1337 | rskb->data_len += rskb->len; |
1338 | rskb->truesize += rskb->len; |
1339 | |
1340 | /* Avoid nested fragments */ |
1341 | skb_walk_frags(skb, fs) |
1342 | flen += fs->len; |
1343 | skb->next = skb_shinfo(skb)->frag_list; |
1344 | skb_frag_list_init(skb); |
1345 | skb->len -= flen; |
1346 | skb->data_len -= flen; |
1347 | skb->truesize -= flen; |
1348 | |
1349 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); |
1350 | return pipe_skb_send(sk, rskb); |
1351 | } |
1352 | |
1353 | struct sk_buff *pep_read(struct sock *sk) |
1354 | { |
1355 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); |
1356 | |
1357 | if (sk->sk_state == TCP_ESTABLISHED) |
1358 | pipe_grant_credits(sk); |
1359 | return skb; |
1360 | } |
1361 | |
1362 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
1363 | struct msghdr *msg, size_t len, int noblock, |
1364 | int flags, int *addr_len) |
1365 | { |
1366 | struct sk_buff *skb; |
1367 | int err; |
1368 | |
1369 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
1370 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) |
1371 | return -EOPNOTSUPP; |
1372 | |
1373 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
1374 | return -ENOTCONN; |
1375 | |
1376 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
1377 | /* Dequeue and acknowledge control request */ |
1378 | struct pep_sock *pn = pep_sk(sk); |
1379 | |
1380 | if (flags & MSG_PEEK) |
1381 | return -EOPNOTSUPP; |
1382 | skb = skb_dequeue(&pn->ctrlreq_queue); |
1383 | if (skb) { |
1384 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, |
1385 | GFP_KERNEL); |
1386 | msg->msg_flags |= MSG_OOB; |
1387 | goto copy; |
1388 | } |
1389 | if (flags & MSG_OOB) |
1390 | return -EINVAL; |
1391 | } |
1392 | |
1393 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1394 | lock_sock(sk); |
1395 | if (skb == NULL) { |
1396 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) |
1397 | err = -ECONNRESET; |
1398 | release_sock(sk); |
1399 | return err; |
1400 | } |
1401 | |
1402 | if (sk->sk_state == TCP_ESTABLISHED) |
1403 | pipe_grant_credits(sk); |
1404 | release_sock(sk); |
1405 | copy: |
1406 | msg->msg_flags |= MSG_EOR; |
1407 | if (skb->len > len) |
1408 | msg->msg_flags |= MSG_TRUNC; |
1409 | else |
1410 | len = skb->len; |
1411 | |
1412 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); |
1413 | if (!err) |
1414 | err = (flags & MSG_TRUNC) ? skb->len : len; |
1415 | |
1416 | skb_free_datagram(sk, skb); |
1417 | return err; |
1418 | } |
1419 | |
1420 | static void pep_sock_unhash(struct sock *sk) |
1421 | { |
1422 | struct pep_sock *pn = pep_sk(sk); |
1423 | struct sock *skparent = NULL; |
1424 | |
1425 | lock_sock(sk); |
1426 | |
1427 | #ifndef CONFIG_PHONET_PIPECTRLR |
1428 | if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) { |
1429 | skparent = pn->listener; |
1430 | release_sock(sk); |
1431 | |
1432 | pn = pep_sk(skparent); |
1433 | lock_sock(skparent); |
1434 | sk_del_node_init(sk); |
1435 | sk = skparent; |
1436 | } |
1437 | #endif |
1438 | /* Unhash a listening sock only when it is closed |
1439 | * and all of its active connected pipes are closed. */ |
1440 | if (hlist_empty(&pn->hlist)) |
1441 | pn_sock_unhash(&pn->pn_sk.sk); |
1442 | release_sock(sk); |
1443 | |
1444 | if (skparent) |
1445 | sock_put(skparent); |
1446 | } |
1447 | |
1448 | static struct proto pep_proto = { |
1449 | .close = pep_sock_close, |
1450 | .accept = pep_sock_accept, |
1451 | #ifdef CONFIG_PHONET_PIPECTRLR |
1452 | .connect = pep_sock_connect, |
1453 | #endif |
1454 | .ioctl = pep_ioctl, |
1455 | .init = pep_init, |
1456 | .setsockopt = pep_setsockopt, |
1457 | .getsockopt = pep_getsockopt, |
1458 | .sendmsg = pep_sendmsg, |
1459 | .recvmsg = pep_recvmsg, |
1460 | .backlog_rcv = pep_do_rcv, |
1461 | .hash = pn_sock_hash, |
1462 | .unhash = pep_sock_unhash, |
1463 | .get_port = pn_sock_get_port, |
1464 | .obj_size = sizeof(struct pep_sock), |
1465 | .owner = THIS_MODULE, |
1466 | .name = "PNPIPE", |
1467 | }; |
1468 | |
1469 | static struct phonet_protocol pep_pn_proto = { |
1470 | .ops = &phonet_stream_ops, |
1471 | .prot = &pep_proto, |
1472 | .sock_type = SOCK_SEQPACKET, |
1473 | }; |
1474 | |
1475 | static int __init pep_register(void) |
1476 | { |
1477 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); |
1478 | } |
1479 | |
1480 | static void __exit pep_unregister(void) |
1481 | { |
1482 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); |
1483 | } |
1484 | |
1485 | module_init(pep_register); |
1486 | module_exit(pep_unregister); |
1487 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); |
1488 | MODULE_DESCRIPTION("Phonet pipe protocol"); |
1489 | MODULE_LICENSE("GPL"); |
1490 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |
1491 |
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