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9641458d RDC |
1 | /* |
2 | * File: pep.c | |
3 | * | |
4 | * Phonet pipe protocol end point socket | |
5 | * | |
6 | * Copyright (C) 2008 Nokia Corporation. | |
7 | * | |
8 | * Author: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or | |
11 | * modify it under the terms of the GNU General Public License | |
12 | * version 2 as published by the Free Software Foundation. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, but | |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
22 | * 02110-1301 USA | |
23 | */ | |
24 | ||
25 | #include <linux/kernel.h> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
9641458d RDC |
27 | #include <linux/socket.h> |
28 | #include <net/sock.h> | |
29 | #include <net/tcp_states.h> | |
30 | #include <asm/ioctls.h> | |
31 | ||
32 | #include <linux/phonet.h> | |
33 | #include <net/phonet/phonet.h> | |
34 | #include <net/phonet/pep.h> | |
02a47617 | 35 | #include <net/phonet/gprs.h> |
9641458d RDC |
36 | |
37 | /* sk_state values: | |
38 | * TCP_CLOSE sock not in use yet | |
39 | * TCP_CLOSE_WAIT disconnected pipe | |
40 | * TCP_LISTEN listening pipe endpoint | |
41 | * TCP_SYN_RECV connected pipe in disabled state | |
42 | * TCP_ESTABLISHED connected pipe in enabled state | |
43 | * | |
44 | * pep_sock locking: | |
45 | * - sk_state, ackq, hlist: sock lock needed | |
46 | * - listener: read only | |
47 | * - pipe_handle: read only | |
48 | */ | |
49 | ||
50 | #define CREDITS_MAX 10 | |
51 | #define CREDITS_THR 7 | |
52 | ||
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; | |
8d98efa8 KS |
91 | #ifdef CONFIG_PHONET_PIPECTRLR |
92 | const struct phonethdr *hdr = pn_hdr(oskb); | |
93 | struct sockaddr_pn spn = { | |
94 | .spn_family = AF_PHONET, | |
95 | .spn_resource = 0xD9, | |
96 | .spn_dev = hdr->pn_sdev, | |
97 | .spn_obj = hdr->pn_sobj, | |
98 | }; | |
99 | #endif | |
9641458d RDC |
100 | |
101 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
102 | if (!skb) | |
103 | return -ENOMEM; | |
104 | skb_set_owner_w(skb, sk); | |
105 | ||
106 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
107 | __skb_put(skb, len); | |
108 | skb_copy_to_linear_data(skb, data, len); | |
109 | __skb_push(skb, sizeof(*ph)); | |
110 | skb_reset_transport_header(skb); | |
111 | ph = pnp_hdr(skb); | |
112 | ph->utid = oph->utid; | |
113 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ | |
114 | ph->pipe_handle = oph->pipe_handle; | |
115 | ph->error_code = code; | |
116 | ||
8d98efa8 KS |
117 | #ifdef CONFIG_PHONET_PIPECTRLR |
118 | return pn_skb_send(sk, skb, &spn); | |
119 | #else | |
9641458d | 120 | return pn_skb_send(sk, skb, &pipe_srv); |
8d98efa8 | 121 | #endif |
9641458d RDC |
122 | } |
123 | ||
124 | #define PAD 0x00 | |
8d98efa8 KS |
125 | |
126 | #ifdef CONFIG_PHONET_PIPECTRLR | |
127 | static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len) | |
128 | { | |
129 | int i, j; | |
130 | u8 base_fc, final_fc; | |
131 | ||
132 | for (i = 0; i < len; i++) { | |
133 | base_fc = host_fc[i]; | |
134 | for (j = 0; j < len; j++) { | |
135 | if (remote_fc[j] == base_fc) { | |
136 | final_fc = base_fc; | |
137 | goto done; | |
138 | } | |
139 | } | |
140 | } | |
141 | return -EINVAL; | |
142 | ||
143 | done: | |
144 | return final_fc; | |
145 | ||
146 | } | |
147 | ||
148 | static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb, | |
149 | u8 *pref_rx_fc, u8 *req_tx_fc) | |
150 | { | |
151 | struct pnpipehdr *hdr; | |
152 | u8 n_sb; | |
153 | ||
154 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
155 | return -EINVAL; | |
156 | ||
157 | hdr = pnp_hdr(skb); | |
158 | n_sb = hdr->data[4]; | |
159 | ||
160 | __skb_pull(skb, sizeof(*hdr) + 4); | |
161 | while (n_sb > 0) { | |
162 | u8 type, buf[3], len = sizeof(buf); | |
163 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
164 | ||
165 | if (data == NULL) | |
166 | return -EINVAL; | |
167 | ||
168 | switch (type) { | |
169 | case PN_PIPE_SB_REQUIRED_FC_TX: | |
170 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
171 | break; | |
172 | req_tx_fc[0] = data[2]; | |
173 | req_tx_fc[1] = data[3]; | |
174 | req_tx_fc[2] = data[4]; | |
175 | break; | |
176 | ||
177 | case PN_PIPE_SB_PREFERRED_FC_RX: | |
178 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
179 | break; | |
180 | pref_rx_fc[0] = data[2]; | |
181 | pref_rx_fc[1] = data[3]; | |
182 | pref_rx_fc[2] = data[4]; | |
183 | break; | |
184 | ||
185 | } | |
186 | n_sb--; | |
187 | } | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static int pipe_handler_send_req(struct sock *sk, u16 dobj, u8 utid, | |
192 | u8 msg_id, u8 p_handle, gfp_t priority) | |
193 | { | |
194 | int len; | |
195 | struct pnpipehdr *ph; | |
196 | struct sk_buff *skb; | |
197 | struct sockaddr_pn spn = { | |
198 | .spn_family = AF_PHONET, | |
199 | .spn_resource = 0xD9, | |
200 | .spn_dev = pn_dev(dobj), | |
201 | .spn_obj = pn_obj(dobj), | |
202 | }; | |
203 | ||
204 | static const u8 data[4] = { | |
205 | PAD, PAD, PAD, PAD, | |
206 | }; | |
207 | ||
208 | switch (msg_id) { | |
209 | case PNS_PEP_CONNECT_REQ: | |
210 | len = sizeof(data); | |
211 | break; | |
212 | ||
213 | case PNS_PEP_DISCONNECT_REQ: | |
214 | case PNS_PEP_ENABLE_REQ: | |
215 | case PNS_PEP_DISABLE_REQ: | |
216 | len = 0; | |
217 | break; | |
218 | ||
219 | default: | |
220 | return -EINVAL; | |
221 | } | |
222 | ||
223 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
224 | if (!skb) | |
225 | return -ENOMEM; | |
226 | skb_set_owner_w(skb, sk); | |
227 | ||
228 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
229 | if (len) { | |
230 | __skb_put(skb, len); | |
231 | skb_copy_to_linear_data(skb, data, len); | |
232 | } | |
233 | __skb_push(skb, sizeof(*ph)); | |
234 | skb_reset_transport_header(skb); | |
235 | ph = pnp_hdr(skb); | |
236 | ph->utid = utid; | |
237 | ph->message_id = msg_id; | |
238 | ph->pipe_handle = p_handle; | |
239 | ph->error_code = PN_PIPE_NO_ERROR; | |
240 | ||
241 | return pn_skb_send(sk, skb, &spn); | |
242 | } | |
243 | ||
244 | static int pipe_handler_send_created_ind(struct sock *sk, u16 dobj, | |
245 | u8 utid, u8 p_handle, u8 msg_id, u8 tx_fc, u8 rx_fc) | |
246 | { | |
247 | int err_code; | |
248 | struct pnpipehdr *ph; | |
249 | struct sk_buff *skb; | |
250 | struct sockaddr_pn spn = { | |
251 | .spn_family = AF_PHONET, | |
252 | .spn_resource = 0xD9, | |
253 | .spn_dev = pn_dev(dobj), | |
254 | .spn_obj = pn_obj(dobj), | |
255 | }; | |
256 | ||
257 | static u8 data[4] = { | |
258 | 0x03, 0x04, | |
259 | }; | |
260 | data[2] = tx_fc; | |
261 | data[3] = rx_fc; | |
262 | ||
263 | /* | |
264 | * actually, below is number of sub-blocks and not error code. | |
265 | * Pipe_created_ind message format does not have any | |
266 | * error code field. However, the Phonet stack will always send | |
267 | * an error code as part of pnpipehdr. So, use that err_code to | |
268 | * specify the number of sub-blocks. | |
269 | */ | |
270 | err_code = 0x01; | |
271 | ||
272 | skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC); | |
273 | if (!skb) | |
274 | return -ENOMEM; | |
275 | skb_set_owner_w(skb, sk); | |
276 | ||
277 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
278 | __skb_put(skb, sizeof(data)); | |
279 | skb_copy_to_linear_data(skb, data, sizeof(data)); | |
280 | __skb_push(skb, sizeof(*ph)); | |
281 | skb_reset_transport_header(skb); | |
282 | ph = pnp_hdr(skb); | |
283 | ph->utid = utid; | |
284 | ph->message_id = msg_id; | |
285 | ph->pipe_handle = p_handle; | |
286 | ph->error_code = err_code; | |
287 | ||
288 | return pn_skb_send(sk, skb, &spn); | |
289 | } | |
290 | ||
291 | static int pipe_handler_send_ind(struct sock *sk, u16 dobj, u8 utid, | |
292 | u8 p_handle, u8 msg_id) | |
293 | { | |
294 | int err_code; | |
295 | struct pnpipehdr *ph; | |
296 | struct sk_buff *skb; | |
297 | struct sockaddr_pn spn = { | |
298 | .spn_family = AF_PHONET, | |
299 | .spn_resource = 0xD9, | |
300 | .spn_dev = pn_dev(dobj), | |
301 | .spn_obj = pn_obj(dobj), | |
302 | }; | |
303 | ||
304 | /* | |
305 | * actually, below is a filler. | |
306 | * Pipe_enabled/disabled_ind message format does not have any | |
307 | * error code field. However, the Phonet stack will always send | |
308 | * an error code as part of pnpipehdr. So, use that err_code to | |
309 | * specify the filler value. | |
310 | */ | |
311 | err_code = 0x0; | |
312 | ||
313 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); | |
314 | if (!skb) | |
315 | return -ENOMEM; | |
316 | skb_set_owner_w(skb, sk); | |
317 | ||
318 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
319 | __skb_push(skb, sizeof(*ph)); | |
320 | skb_reset_transport_header(skb); | |
321 | ph = pnp_hdr(skb); | |
322 | ph->utid = utid; | |
323 | ph->message_id = msg_id; | |
324 | ph->pipe_handle = p_handle; | |
325 | ph->error_code = err_code; | |
326 | ||
327 | return pn_skb_send(sk, skb, &spn); | |
328 | } | |
329 | ||
03789f26 | 330 | static int pipe_handler_enable_pipe(struct sock *sk, int enable) |
8d98efa8 | 331 | { |
8d98efa8 | 332 | struct pep_sock *pn = pep_sk(sk); |
03789f26 RDC |
333 | int utid, req; |
334 | ||
335 | if (enable) { | |
336 | utid = PNS_PIPE_ENABLE_UTID; | |
337 | req = PNS_PEP_ENABLE_REQ; | |
338 | } else { | |
339 | utid = PNS_PIPE_DISABLE_UTID; | |
340 | req = PNS_PEP_DISABLE_REQ; | |
8d98efa8 | 341 | } |
03789f26 RDC |
342 | return pipe_handler_send_req(sk, pn->pn_sk.sobject, utid, req, |
343 | pn->pipe_handle, GFP_ATOMIC); | |
8d98efa8 KS |
344 | } |
345 | ||
346 | static int pipe_handler_create_pipe(struct sock *sk, int pipe_handle, int cmd) | |
347 | { | |
348 | int ret; | |
349 | struct pep_sock *pn = pep_sk(sk); | |
350 | ||
351 | switch (cmd) { | |
352 | case PNPIPE_CREATE: | |
353 | ret = pipe_handler_send_req(sk, pn->pn_sk.sobject, | |
354 | PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ, | |
355 | pipe_handle, GFP_ATOMIC); | |
356 | break; | |
357 | ||
358 | case PNPIPE_DESTROY: | |
359 | ret = pipe_handler_send_req(sk, pn->remote_pep, | |
360 | PNS_PEP_DISCONNECT_UTID, | |
361 | PNS_PEP_DISCONNECT_REQ, | |
362 | pn->pipe_handle, GFP_ATOMIC); | |
363 | break; | |
364 | ||
365 | default: | |
366 | ret = -EINVAL; | |
367 | } | |
368 | ||
369 | return ret; | |
370 | } | |
371 | #endif | |
372 | ||
9641458d RDC |
373 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
374 | { | |
375 | static const u8 data[20] = { | |
376 | PAD, PAD, PAD, 2 /* sub-blocks */, | |
377 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, | |
378 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
379 | PN_ONE_CREDIT_FLOW_CONTROL, | |
380 | PN_LEGACY_FLOW_CONTROL, | |
381 | PAD, | |
382 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, | |
383 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
384 | PN_ONE_CREDIT_FLOW_CONTROL, | |
385 | PN_LEGACY_FLOW_CONTROL, | |
386 | PAD, | |
387 | }; | |
388 | ||
389 | might_sleep(); | |
390 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), | |
391 | GFP_KERNEL); | |
392 | } | |
393 | ||
394 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code) | |
395 | { | |
396 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; | |
397 | WARN_ON(code == PN_PIPE_NO_ERROR); | |
398 | return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC); | |
399 | } | |
400 | ||
401 | /* Control requests are not sent by the pipe service and have a specific | |
402 | * message format. */ | |
c41bd97f RDC |
403 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
404 | gfp_t priority) | |
9641458d RDC |
405 | { |
406 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
407 | struct sk_buff *skb; | |
408 | struct pnpipehdr *ph; | |
409 | struct sockaddr_pn dst; | |
410 | ||
c41bd97f | 411 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); |
9641458d RDC |
412 | if (!skb) |
413 | return -ENOMEM; | |
414 | skb_set_owner_w(skb, sk); | |
415 | ||
416 | skb_reserve(skb, MAX_PHONET_HEADER); | |
417 | ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4); | |
418 | ||
419 | ph->utid = oph->utid; | |
420 | ph->message_id = PNS_PEP_CTRL_RESP; | |
421 | ph->pipe_handle = oph->pipe_handle; | |
422 | ph->data[0] = oph->data[1]; /* CTRL id */ | |
423 | ph->data[1] = oph->data[0]; /* PEP type */ | |
424 | ph->data[2] = code; /* error code, at an usual offset */ | |
425 | ph->data[3] = PAD; | |
426 | ph->data[4] = PAD; | |
427 | ||
428 | pn_skb_get_src_sockaddr(oskb, &dst); | |
429 | return pn_skb_send(sk, skb, &dst); | |
430 | } | |
431 | ||
432 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) | |
433 | { | |
434 | struct pep_sock *pn = pep_sk(sk); | |
435 | struct pnpipehdr *ph; | |
436 | struct sk_buff *skb; | |
8d98efa8 KS |
437 | #ifdef CONFIG_PHONET_PIPECTRLR |
438 | struct sockaddr_pn spn = { | |
439 | .spn_family = AF_PHONET, | |
440 | .spn_resource = 0xD9, | |
441 | .spn_dev = pn_dev(pn->remote_pep), | |
442 | .spn_obj = pn_obj(pn->remote_pep), | |
443 | }; | |
444 | #endif | |
9641458d RDC |
445 | |
446 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); | |
447 | if (!skb) | |
448 | return -ENOMEM; | |
449 | skb_set_owner_w(skb, sk); | |
450 | ||
451 | skb_reserve(skb, MAX_PNPIPE_HEADER + 4); | |
452 | __skb_push(skb, sizeof(*ph) + 4); | |
453 | skb_reset_transport_header(skb); | |
454 | ph = pnp_hdr(skb); | |
455 | ph->utid = 0; | |
456 | ph->message_id = PNS_PEP_STATUS_IND; | |
457 | ph->pipe_handle = pn->pipe_handle; | |
458 | ph->pep_type = PN_PEP_TYPE_COMMON; | |
459 | ph->data[1] = type; | |
460 | ph->data[2] = PAD; | |
461 | ph->data[3] = PAD; | |
462 | ph->data[4] = status; | |
463 | ||
8d98efa8 KS |
464 | #ifdef CONFIG_PHONET_PIPECTRLR |
465 | return pn_skb_send(sk, skb, &spn); | |
466 | #else | |
9641458d | 467 | return pn_skb_send(sk, skb, &pipe_srv); |
8d98efa8 | 468 | #endif |
9641458d RDC |
469 | } |
470 | ||
471 | /* Send our RX flow control information to the sender. | |
472 | * Socket must be locked. */ | |
473 | static void pipe_grant_credits(struct sock *sk) | |
474 | { | |
475 | struct pep_sock *pn = pep_sk(sk); | |
476 | ||
477 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
478 | ||
479 | switch (pn->rx_fc) { | |
480 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ | |
481 | break; | |
482 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
483 | pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, | |
484 | PEP_IND_READY, GFP_ATOMIC); | |
485 | pn->rx_credits = 1; | |
486 | break; | |
487 | case PN_MULTI_CREDIT_FLOW_CONTROL: | |
488 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) | |
489 | break; | |
490 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, | |
491 | CREDITS_MAX - pn->rx_credits, | |
492 | GFP_ATOMIC) == 0) | |
493 | pn->rx_credits = CREDITS_MAX; | |
494 | break; | |
495 | } | |
496 | } | |
497 | ||
498 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) | |
499 | { | |
500 | struct pep_sock *pn = pep_sk(sk); | |
a91e7d47 | 501 | struct pnpipehdr *hdr; |
be677730 | 502 | int wake = 0; |
9641458d RDC |
503 | |
504 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
505 | return -EINVAL; | |
506 | ||
a91e7d47 | 507 | hdr = pnp_hdr(skb); |
9641458d RDC |
508 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
509 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", | |
510 | (unsigned)hdr->data[0]); | |
511 | return -EOPNOTSUPP; | |
512 | } | |
513 | ||
514 | switch (hdr->data[1]) { | |
515 | case PN_PEP_IND_FLOW_CONTROL: | |
516 | switch (pn->tx_fc) { | |
517 | case PN_LEGACY_FLOW_CONTROL: | |
518 | switch (hdr->data[4]) { | |
519 | case PEP_IND_BUSY: | |
be677730 | 520 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
521 | break; |
522 | case PEP_IND_READY: | |
be677730 | 523 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
524 | break; |
525 | } | |
526 | break; | |
527 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
528 | if (hdr->data[4] == PEP_IND_READY) | |
be677730 | 529 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
530 | break; |
531 | } | |
532 | break; | |
533 | ||
534 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: | |
535 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) | |
536 | break; | |
be677730 | 537 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
9641458d RDC |
538 | break; |
539 | ||
540 | default: | |
541 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", | |
542 | (unsigned)hdr->data[1]); | |
543 | return -EOPNOTSUPP; | |
544 | } | |
be677730 | 545 | if (wake) |
9641458d RDC |
546 | sk->sk_write_space(sk); |
547 | return 0; | |
548 | } | |
549 | ||
550 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) | |
551 | { | |
552 | struct pep_sock *pn = pep_sk(sk); | |
553 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
554 | u8 n_sb = hdr->data[0]; | |
555 | ||
556 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
557 | __skb_pull(skb, sizeof(*hdr)); | |
558 | while (n_sb > 0) { | |
559 | u8 type, buf[2], len = sizeof(buf); | |
560 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
561 | ||
562 | if (data == NULL) | |
563 | return -EINVAL; | |
564 | switch (type) { | |
565 | case PN_PIPE_SB_NEGOTIATED_FC: | |
566 | if (len < 2 || (data[0] | data[1]) > 3) | |
567 | break; | |
568 | pn->tx_fc = data[0] & 3; | |
569 | pn->rx_fc = data[1] & 3; | |
570 | break; | |
571 | } | |
572 | n_sb--; | |
573 | } | |
574 | return 0; | |
575 | } | |
576 | ||
577 | /* Queue an skb to a connected sock. | |
578 | * Socket lock must be held. */ | |
579 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) | |
580 | { | |
581 | struct pep_sock *pn = pep_sk(sk); | |
582 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
c41bd97f | 583 | struct sk_buff_head *queue; |
9641458d | 584 | int err = 0; |
8d98efa8 KS |
585 | #ifdef CONFIG_PHONET_PIPECTRLR |
586 | struct phonethdr *ph = pn_hdr(skb); | |
587 | static u8 host_pref_rx_fc[3], host_req_tx_fc[3]; | |
588 | u8 remote_pref_rx_fc[3], remote_req_tx_fc[3]; | |
589 | u8 negotiated_rx_fc, negotiated_tx_fc; | |
590 | #endif | |
9641458d RDC |
591 | |
592 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); | |
593 | ||
594 | switch (hdr->message_id) { | |
595 | case PNS_PEP_CONNECT_REQ: | |
596 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
597 | break; | |
598 | ||
8d98efa8 KS |
599 | #ifdef CONFIG_PHONET_PIPECTRLR |
600 | case PNS_PEP_CONNECT_RESP: | |
601 | if ((ph->pn_sdev == pn_dev(pn->remote_pep)) && | |
602 | (ph->pn_sobj == pn_obj(pn->remote_pep))) { | |
603 | pipe_get_flow_info(sk, skb, remote_pref_rx_fc, | |
604 | remote_req_tx_fc); | |
605 | ||
606 | negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc, | |
607 | host_pref_rx_fc, | |
608 | sizeof(host_pref_rx_fc)); | |
609 | negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc, | |
610 | remote_pref_rx_fc, | |
611 | sizeof(host_pref_rx_fc)); | |
612 | ||
613 | pn->pipe_state = PIPE_DISABLED; | |
614 | pipe_handler_send_created_ind(sk, pn->remote_pep, | |
615 | PNS_PIPE_CREATED_IND_UTID, | |
616 | pn->pipe_handle, PNS_PIPE_CREATED_IND, | |
617 | negotiated_tx_fc, negotiated_rx_fc); | |
618 | pipe_handler_send_created_ind(sk, pn->pn_sk.sobject, | |
619 | PNS_PIPE_CREATED_IND_UTID, | |
620 | pn->pipe_handle, PNS_PIPE_CREATED_IND, | |
621 | negotiated_tx_fc, negotiated_rx_fc); | |
622 | } else { | |
623 | pipe_handler_send_req(sk, pn->remote_pep, | |
624 | PNS_PEP_CONNECT_UTID, | |
625 | PNS_PEP_CONNECT_REQ, pn->pipe_handle, | |
626 | GFP_ATOMIC); | |
627 | pipe_get_flow_info(sk, skb, host_pref_rx_fc, | |
628 | host_req_tx_fc); | |
629 | } | |
630 | break; | |
631 | #endif | |
632 | ||
9641458d RDC |
633 | case PNS_PEP_DISCONNECT_REQ: |
634 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
635 | sk->sk_state = TCP_CLOSE_WAIT; | |
636 | if (!sock_flag(sk, SOCK_DEAD)) | |
637 | sk->sk_state_change(sk); | |
638 | break; | |
639 | ||
8d98efa8 KS |
640 | #ifdef CONFIG_PHONET_PIPECTRLR |
641 | case PNS_PEP_DISCONNECT_RESP: | |
642 | pn->pipe_state = PIPE_IDLE; | |
643 | pipe_handler_send_req(sk, pn->pn_sk.sobject, | |
644 | PNS_PEP_DISCONNECT_UTID, | |
645 | PNS_PEP_DISCONNECT_REQ, pn->pipe_handle, | |
646 | GFP_KERNEL); | |
647 | break; | |
648 | #endif | |
649 | ||
9641458d RDC |
650 | case PNS_PEP_ENABLE_REQ: |
651 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ | |
652 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
653 | break; | |
654 | ||
8d98efa8 KS |
655 | #ifdef CONFIG_PHONET_PIPECTRLR |
656 | case PNS_PEP_ENABLE_RESP: | |
657 | if ((ph->pn_sdev == pn_dev(pn->remote_pep)) && | |
658 | (ph->pn_sobj == pn_obj(pn->remote_pep))) { | |
659 | pn->pipe_state = PIPE_ENABLED; | |
660 | pipe_handler_send_ind(sk, pn->remote_pep, | |
661 | PNS_PIPE_ENABLED_IND_UTID, | |
662 | pn->pipe_handle, PNS_PIPE_ENABLED_IND); | |
663 | pipe_handler_send_ind(sk, pn->pn_sk.sobject, | |
664 | PNS_PIPE_ENABLED_IND_UTID, | |
665 | pn->pipe_handle, PNS_PIPE_ENABLED_IND); | |
666 | } else | |
667 | pipe_handler_send_req(sk, pn->remote_pep, | |
668 | PNS_PIPE_ENABLE_UTID, | |
669 | PNS_PEP_ENABLE_REQ, pn->pipe_handle, | |
670 | GFP_KERNEL); | |
671 | ||
672 | break; | |
673 | #endif | |
674 | ||
9641458d RDC |
675 | case PNS_PEP_RESET_REQ: |
676 | switch (hdr->state_after_reset) { | |
677 | case PN_PIPE_DISABLE: | |
678 | pn->init_enable = 0; | |
679 | break; | |
680 | case PN_PIPE_ENABLE: | |
681 | pn->init_enable = 1; | |
682 | break; | |
683 | default: /* not allowed to send an error here!? */ | |
684 | err = -EINVAL; | |
685 | goto out; | |
686 | } | |
687 | /* fall through */ | |
688 | case PNS_PEP_DISABLE_REQ: | |
be677730 | 689 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
690 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
691 | break; | |
692 | ||
8d98efa8 KS |
693 | #ifdef CONFIG_PHONET_PIPECTRLR |
694 | case PNS_PEP_DISABLE_RESP: | |
695 | if ((ph->pn_sdev == pn_dev(pn->remote_pep)) && | |
696 | (ph->pn_sobj == pn_obj(pn->remote_pep))) { | |
697 | pn->pipe_state = PIPE_DISABLED; | |
698 | pipe_handler_send_ind(sk, pn->remote_pep, | |
699 | PNS_PIPE_DISABLED_IND_UTID, | |
700 | pn->pipe_handle, | |
701 | PNS_PIPE_DISABLED_IND); | |
702 | pipe_handler_send_ind(sk, pn->pn_sk.sobject, | |
703 | PNS_PIPE_DISABLED_IND_UTID, | |
704 | pn->pipe_handle, | |
705 | PNS_PIPE_DISABLED_IND); | |
706 | } else | |
707 | pipe_handler_send_req(sk, pn->remote_pep, | |
708 | PNS_PIPE_DISABLE_UTID, | |
709 | PNS_PEP_DISABLE_REQ, pn->pipe_handle, | |
710 | GFP_KERNEL); | |
711 | break; | |
712 | #endif | |
713 | ||
9641458d | 714 | case PNS_PEP_CTRL_REQ: |
2e2fb4b3 RDC |
715 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
716 | atomic_inc(&sk->sk_drops); | |
c41bd97f | 717 | break; |
2e2fb4b3 | 718 | } |
c41bd97f RDC |
719 | __skb_pull(skb, 4); |
720 | queue = &pn->ctrlreq_queue; | |
721 | goto queue; | |
9641458d | 722 | |
fc6a1107 RDC |
723 | case PNS_PIPE_ALIGNED_DATA: |
724 | __skb_pull(skb, 1); | |
725 | /* fall through */ | |
9641458d RDC |
726 | case PNS_PIPE_DATA: |
727 | __skb_pull(skb, 3); /* Pipe data header */ | |
728 | if (!pn_flow_safe(pn->rx_fc)) { | |
729 | err = sock_queue_rcv_skb(sk, skb); | |
730 | if (!err) | |
731 | return 0; | |
732 | break; | |
733 | } | |
734 | ||
735 | if (pn->rx_credits == 0) { | |
2e2fb4b3 | 736 | atomic_inc(&sk->sk_drops); |
9641458d RDC |
737 | err = -ENOBUFS; |
738 | break; | |
739 | } | |
740 | pn->rx_credits--; | |
c41bd97f RDC |
741 | queue = &sk->sk_receive_queue; |
742 | goto queue; | |
9641458d RDC |
743 | |
744 | case PNS_PEP_STATUS_IND: | |
745 | pipe_rcv_status(sk, skb); | |
746 | break; | |
747 | ||
748 | case PNS_PIPE_REDIRECTED_IND: | |
749 | err = pipe_rcv_created(sk, skb); | |
750 | break; | |
751 | ||
752 | case PNS_PIPE_CREATED_IND: | |
753 | err = pipe_rcv_created(sk, skb); | |
754 | if (err) | |
755 | break; | |
756 | /* fall through */ | |
757 | case PNS_PIPE_RESET_IND: | |
758 | if (!pn->init_enable) | |
759 | break; | |
760 | /* fall through */ | |
761 | case PNS_PIPE_ENABLED_IND: | |
762 | if (!pn_flow_safe(pn->tx_fc)) { | |
be677730 | 763 | atomic_set(&pn->tx_credits, 1); |
9641458d RDC |
764 | sk->sk_write_space(sk); |
765 | } | |
766 | if (sk->sk_state == TCP_ESTABLISHED) | |
767 | break; /* Nothing to do */ | |
768 | sk->sk_state = TCP_ESTABLISHED; | |
769 | pipe_grant_credits(sk); | |
770 | break; | |
771 | ||
772 | case PNS_PIPE_DISABLED_IND: | |
773 | sk->sk_state = TCP_SYN_RECV; | |
774 | pn->rx_credits = 0; | |
775 | break; | |
776 | ||
777 | default: | |
778 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", | |
779 | hdr->message_id); | |
780 | err = -EINVAL; | |
781 | } | |
782 | out: | |
783 | kfree_skb(skb); | |
784 | return err; | |
c41bd97f RDC |
785 | |
786 | queue: | |
787 | skb->dev = NULL; | |
788 | skb_set_owner_r(skb, sk); | |
789 | err = skb->len; | |
790 | skb_queue_tail(queue, skb); | |
791 | if (!sock_flag(sk, SOCK_DEAD)) | |
792 | sk->sk_data_ready(sk, err); | |
793 | return 0; | |
9641458d RDC |
794 | } |
795 | ||
796 | /* Destroy connected sock. */ | |
797 | static void pipe_destruct(struct sock *sk) | |
798 | { | |
c41bd97f RDC |
799 | struct pep_sock *pn = pep_sk(sk); |
800 | ||
9641458d | 801 | skb_queue_purge(&sk->sk_receive_queue); |
c41bd97f | 802 | skb_queue_purge(&pn->ctrlreq_queue); |
9641458d RDC |
803 | } |
804 | ||
805 | static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) | |
806 | { | |
807 | struct sock *newsk; | |
808 | struct pep_sock *newpn, *pn = pep_sk(sk); | |
809 | struct pnpipehdr *hdr; | |
810 | struct sockaddr_pn dst; | |
811 | u16 peer_type; | |
812 | u8 pipe_handle, enabled, n_sb; | |
fea93ece | 813 | u8 aligned = 0; |
9641458d RDC |
814 | |
815 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) | |
816 | return -EINVAL; | |
817 | ||
818 | hdr = pnp_hdr(skb); | |
819 | pipe_handle = hdr->pipe_handle; | |
820 | switch (hdr->state_after_connect) { | |
821 | case PN_PIPE_DISABLE: | |
822 | enabled = 0; | |
823 | break; | |
824 | case PN_PIPE_ENABLE: | |
825 | enabled = 1; | |
826 | break; | |
827 | default: | |
828 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM); | |
829 | return -EINVAL; | |
830 | } | |
831 | peer_type = hdr->other_pep_type << 8; | |
832 | ||
833 | if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) { | |
834 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
835 | return -ENOBUFS; | |
836 | } | |
837 | ||
838 | /* Parse sub-blocks (options) */ | |
839 | n_sb = hdr->data[4]; | |
840 | while (n_sb > 0) { | |
841 | u8 type, buf[1], len = sizeof(buf); | |
842 | const u8 *data = pep_get_sb(skb, &type, &len, buf); | |
843 | ||
844 | if (data == NULL) | |
845 | return -EINVAL; | |
846 | switch (type) { | |
847 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: | |
848 | if (len < 1) | |
849 | return -EINVAL; | |
850 | peer_type = (peer_type & 0xff00) | data[0]; | |
851 | break; | |
fea93ece RDC |
852 | case PN_PIPE_SB_ALIGNED_DATA: |
853 | aligned = data[0] != 0; | |
854 | break; | |
9641458d RDC |
855 | } |
856 | n_sb--; | |
857 | } | |
858 | ||
859 | skb = skb_clone(skb, GFP_ATOMIC); | |
860 | if (!skb) | |
861 | return -ENOMEM; | |
862 | ||
863 | /* Create a new to-be-accepted sock */ | |
864 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot); | |
865 | if (!newsk) { | |
866 | kfree_skb(skb); | |
867 | return -ENOMEM; | |
868 | } | |
869 | sock_init_data(NULL, newsk); | |
870 | newsk->sk_state = TCP_SYN_RECV; | |
871 | newsk->sk_backlog_rcv = pipe_do_rcv; | |
872 | newsk->sk_protocol = sk->sk_protocol; | |
873 | newsk->sk_destruct = pipe_destruct; | |
874 | ||
875 | newpn = pep_sk(newsk); | |
876 | pn_skb_get_dst_sockaddr(skb, &dst); | |
877 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); | |
878 | newpn->pn_sk.resource = pn->pn_sk.resource; | |
c41bd97f | 879 | skb_queue_head_init(&newpn->ctrlreq_queue); |
9641458d | 880 | newpn->pipe_handle = pipe_handle; |
be677730 | 881 | atomic_set(&newpn->tx_credits, 0); |
9641458d | 882 | newpn->peer_type = peer_type; |
be677730 | 883 | newpn->rx_credits = 0; |
9641458d RDC |
884 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
885 | newpn->init_enable = enabled; | |
fea93ece | 886 | newpn->aligned = aligned; |
8d98efa8 KS |
887 | #ifdef CONFIG_PHONET_PIPECTRLR |
888 | newpn->remote_pep = pn->remote_pep; | |
889 | #endif | |
9641458d RDC |
890 | |
891 | BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue)); | |
892 | skb_queue_head(&newsk->sk_receive_queue, skb); | |
893 | if (!sock_flag(sk, SOCK_DEAD)) | |
894 | sk->sk_data_ready(sk, 0); | |
895 | ||
896 | sk_acceptq_added(sk); | |
897 | sk_add_node(newsk, &pn->ackq); | |
898 | return 0; | |
899 | } | |
900 | ||
901 | /* Listening sock must be locked */ | |
902 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, | |
903 | const struct sockaddr_pn *dst, | |
904 | u8 pipe_handle) | |
905 | { | |
906 | struct hlist_node *node; | |
907 | struct sock *sknode; | |
908 | u16 dobj = pn_sockaddr_get_object(dst); | |
909 | ||
910 | sk_for_each(sknode, node, hlist) { | |
911 | struct pep_sock *pnnode = pep_sk(sknode); | |
912 | ||
913 | /* Ports match, but addresses might not: */ | |
914 | if (pnnode->pn_sk.sobject != dobj) | |
915 | continue; | |
916 | if (pnnode->pipe_handle != pipe_handle) | |
917 | continue; | |
918 | if (sknode->sk_state == TCP_CLOSE_WAIT) | |
919 | continue; | |
920 | ||
921 | sock_hold(sknode); | |
922 | return sknode; | |
923 | } | |
924 | return NULL; | |
925 | } | |
926 | ||
927 | /* | |
928 | * Deliver an skb to a listening sock. | |
929 | * Socket lock must be held. | |
930 | * We then queue the skb to the right connected sock (if any). | |
931 | */ | |
932 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) | |
933 | { | |
934 | struct pep_sock *pn = pep_sk(sk); | |
935 | struct sock *sknode; | |
2ddc1ac1 | 936 | struct pnpipehdr *hdr; |
9641458d RDC |
937 | struct sockaddr_pn dst; |
938 | int err = NET_RX_SUCCESS; | |
939 | u8 pipe_handle; | |
940 | ||
941 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
942 | goto drop; | |
943 | ||
944 | hdr = pnp_hdr(skb); | |
945 | pipe_handle = hdr->pipe_handle; | |
946 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) | |
947 | goto drop; | |
948 | ||
949 | pn_skb_get_dst_sockaddr(skb, &dst); | |
950 | ||
951 | /* Look for an existing pipe handle */ | |
952 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); | |
953 | if (sknode) | |
954 | return sk_receive_skb(sknode, skb, 1); | |
955 | ||
956 | /* Look for a pipe handle pending accept */ | |
957 | sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle); | |
958 | if (sknode) { | |
959 | sock_put(sknode); | |
960 | if (net_ratelimit()) | |
961 | printk(KERN_WARNING"Phonet unconnected PEP ignored"); | |
962 | err = NET_RX_DROP; | |
963 | goto drop; | |
964 | } | |
965 | ||
966 | switch (hdr->message_id) { | |
967 | case PNS_PEP_CONNECT_REQ: | |
968 | err = pep_connreq_rcv(sk, skb); | |
969 | break; | |
970 | ||
971 | case PNS_PEP_DISCONNECT_REQ: | |
972 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
973 | break; | |
974 | ||
975 | case PNS_PEP_CTRL_REQ: | |
c41bd97f | 976 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
9641458d RDC |
977 | break; |
978 | ||
979 | case PNS_PEP_RESET_REQ: | |
980 | case PNS_PEP_ENABLE_REQ: | |
981 | case PNS_PEP_DISABLE_REQ: | |
982 | /* invalid handle is not even allowed here! */ | |
983 | default: | |
984 | err = NET_RX_DROP; | |
985 | } | |
986 | drop: | |
987 | kfree_skb(skb); | |
988 | return err; | |
989 | } | |
990 | ||
6482f554 RDC |
991 | static int pipe_do_remove(struct sock *sk) |
992 | { | |
993 | struct pep_sock *pn = pep_sk(sk); | |
994 | struct pnpipehdr *ph; | |
995 | struct sk_buff *skb; | |
996 | ||
997 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL); | |
998 | if (!skb) | |
999 | return -ENOMEM; | |
1000 | ||
1001 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
1002 | __skb_push(skb, sizeof(*ph)); | |
1003 | skb_reset_transport_header(skb); | |
1004 | ph = pnp_hdr(skb); | |
1005 | ph->utid = 0; | |
1006 | ph->message_id = PNS_PIPE_REMOVE_REQ; | |
1007 | ph->pipe_handle = pn->pipe_handle; | |
1008 | ph->data[0] = PAD; | |
1009 | ||
1010 | return pn_skb_send(sk, skb, &pipe_srv); | |
1011 | } | |
1012 | ||
9641458d RDC |
1013 | /* associated socket ceases to exist */ |
1014 | static void pep_sock_close(struct sock *sk, long timeout) | |
1015 | { | |
1016 | struct pep_sock *pn = pep_sk(sk); | |
02a47617 | 1017 | int ifindex = 0; |
9641458d | 1018 | |
e513480e | 1019 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
9641458d RDC |
1020 | sk_common_release(sk); |
1021 | ||
1022 | lock_sock(sk); | |
1023 | if (sk->sk_state == TCP_LISTEN) { | |
1024 | /* Destroy the listen queue */ | |
1025 | struct sock *sknode; | |
1026 | struct hlist_node *p, *n; | |
1027 | ||
1028 | sk_for_each_safe(sknode, p, n, &pn->ackq) | |
1029 | sk_del_node_init(sknode); | |
1030 | sk->sk_state = TCP_CLOSE; | |
6482f554 RDC |
1031 | } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
1032 | /* Forcefully remove dangling Phonet pipe */ | |
1033 | pipe_do_remove(sk); | |
1034 | ||
02a47617 RDC |
1035 | ifindex = pn->ifindex; |
1036 | pn->ifindex = 0; | |
9641458d | 1037 | release_sock(sk); |
02a47617 RDC |
1038 | |
1039 | if (ifindex) | |
1040 | gprs_detach(sk); | |
e513480e | 1041 | sock_put(sk); |
9641458d RDC |
1042 | } |
1043 | ||
1044 | static int pep_wait_connreq(struct sock *sk, int noblock) | |
1045 | { | |
1046 | struct task_struct *tsk = current; | |
1047 | struct pep_sock *pn = pep_sk(sk); | |
1048 | long timeo = sock_rcvtimeo(sk, noblock); | |
1049 | ||
1050 | for (;;) { | |
1051 | DEFINE_WAIT(wait); | |
1052 | ||
1053 | if (sk->sk_state != TCP_LISTEN) | |
1054 | return -EINVAL; | |
1055 | if (!hlist_empty(&pn->ackq)) | |
1056 | break; | |
1057 | if (!timeo) | |
1058 | return -EWOULDBLOCK; | |
1059 | if (signal_pending(tsk)) | |
1060 | return sock_intr_errno(timeo); | |
1061 | ||
43815482 | 1062 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
9641458d RDC |
1063 | TASK_INTERRUPTIBLE); |
1064 | release_sock(sk); | |
1065 | timeo = schedule_timeout(timeo); | |
1066 | lock_sock(sk); | |
43815482 | 1067 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
1068 | } |
1069 | ||
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) | |
1074 | { | |
1075 | struct pep_sock *pn = pep_sk(sk); | |
1076 | struct sock *newsk = NULL; | |
1077 | struct sk_buff *oskb; | |
1078 | int err; | |
1079 | ||
1080 | lock_sock(sk); | |
1081 | err = pep_wait_connreq(sk, flags & O_NONBLOCK); | |
1082 | if (err) | |
1083 | goto out; | |
1084 | ||
1085 | newsk = __sk_head(&pn->ackq); | |
1086 | ||
1087 | oskb = skb_dequeue(&newsk->sk_receive_queue); | |
1088 | err = pep_accept_conn(newsk, oskb); | |
1089 | if (err) { | |
1090 | skb_queue_head(&newsk->sk_receive_queue, oskb); | |
1091 | newsk = NULL; | |
1092 | goto out; | |
1093 | } | |
635f0815 | 1094 | kfree_skb(oskb); |
9641458d RDC |
1095 | |
1096 | sock_hold(sk); | |
1097 | pep_sk(newsk)->listener = sk; | |
1098 | ||
1099 | sock_hold(newsk); | |
1100 | sk_del_node_init(newsk); | |
1101 | sk_acceptq_removed(sk); | |
1102 | sk_add_node(newsk, &pn->hlist); | |
1103 | __sock_put(newsk); | |
1104 | ||
1105 | out: | |
1106 | release_sock(sk); | |
1107 | *errp = err; | |
1108 | return newsk; | |
1109 | } | |
1110 | ||
1111 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) | |
1112 | { | |
c41bd97f | 1113 | struct pep_sock *pn = pep_sk(sk); |
9641458d RDC |
1114 | int answ; |
1115 | ||
1116 | switch (cmd) { | |
1117 | case SIOCINQ: | |
1118 | if (sk->sk_state == TCP_LISTEN) | |
1119 | return -EINVAL; | |
1120 | ||
1121 | lock_sock(sk); | |
f64f9e71 JP |
1122 | if (sock_flag(sk, SOCK_URGINLINE) && |
1123 | !skb_queue_empty(&pn->ctrlreq_queue)) | |
c41bd97f RDC |
1124 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
1125 | else if (!skb_queue_empty(&sk->sk_receive_queue)) | |
9641458d RDC |
1126 | answ = skb_peek(&sk->sk_receive_queue)->len; |
1127 | else | |
1128 | answ = 0; | |
1129 | release_sock(sk); | |
1130 | return put_user(answ, (int __user *)arg); | |
1131 | } | |
1132 | ||
1133 | return -ENOIOCTLCMD; | |
1134 | } | |
1135 | ||
1136 | static int pep_init(struct sock *sk) | |
1137 | { | |
1138 | struct pep_sock *pn = pep_sk(sk); | |
1139 | ||
1140 | INIT_HLIST_HEAD(&pn->ackq); | |
1141 | INIT_HLIST_HEAD(&pn->hlist); | |
c41bd97f | 1142 | skb_queue_head_init(&pn->ctrlreq_queue); |
9641458d RDC |
1143 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
1144 | return 0; | |
1145 | } | |
1146 | ||
02a47617 | 1147 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1148 | char __user *optval, unsigned int optlen) |
02a47617 RDC |
1149 | { |
1150 | struct pep_sock *pn = pep_sk(sk); | |
1151 | int val = 0, err = 0; | |
8d98efa8 KS |
1152 | #ifdef CONFIG_PHONET_PIPECTRLR |
1153 | int remote_pep; | |
1154 | int pipe_handle; | |
1155 | #endif | |
02a47617 RDC |
1156 | |
1157 | if (level != SOL_PNPIPE) | |
1158 | return -ENOPROTOOPT; | |
1159 | if (optlen >= sizeof(int)) { | |
1160 | if (get_user(val, (int __user *) optval)) | |
1161 | return -EFAULT; | |
1162 | } | |
1163 | ||
1164 | lock_sock(sk); | |
1165 | switch (optname) { | |
8d98efa8 KS |
1166 | #ifdef CONFIG_PHONET_PIPECTRLR |
1167 | case PNPIPE_CREATE: | |
1168 | if (val) { | |
1169 | if (pn->pipe_state > PIPE_IDLE) { | |
1170 | err = -EFAULT; | |
1171 | break; | |
1172 | } | |
1173 | remote_pep = val & 0xFFFF; | |
1174 | pipe_handle = (val >> 16) & 0xFF; | |
1175 | pn->remote_pep = remote_pep; | |
1176 | err = pipe_handler_create_pipe(sk, pipe_handle, | |
1177 | PNPIPE_CREATE); | |
1178 | break; | |
1179 | } | |
1180 | ||
8d98efa8 KS |
1181 | case PNPIPE_DESTROY: |
1182 | if (pn->pipe_state < PIPE_DISABLED) { | |
1183 | err = -EFAULT; | |
1184 | break; | |
1185 | } | |
1186 | ||
1187 | err = pipe_handler_create_pipe(sk, 0x0, PNPIPE_DESTROY); | |
1188 | break; | |
1189 | #endif | |
1190 | ||
02a47617 RDC |
1191 | case PNPIPE_ENCAP: |
1192 | if (val && val != PNPIPE_ENCAP_IP) { | |
1193 | err = -EINVAL; | |
1194 | break; | |
1195 | } | |
1196 | if (!pn->ifindex == !val) | |
1197 | break; /* Nothing to do! */ | |
1198 | if (!capable(CAP_NET_ADMIN)) { | |
1199 | err = -EPERM; | |
1200 | break; | |
1201 | } | |
1202 | if (val) { | |
1203 | release_sock(sk); | |
1204 | err = gprs_attach(sk); | |
1205 | if (err > 0) { | |
1206 | pn->ifindex = err; | |
1207 | err = 0; | |
1208 | } | |
1209 | } else { | |
1210 | pn->ifindex = 0; | |
1211 | release_sock(sk); | |
1212 | gprs_detach(sk); | |
1213 | err = 0; | |
1214 | } | |
1215 | goto out_norel; | |
03789f26 RDC |
1216 | |
1217 | #ifdef CONFIG_PHONET_PIPECTRLR | |
1218 | case PNPIPE_ENABLE: | |
1219 | if (pn->pipe_state <= PIPE_IDLE) { | |
1220 | err = -ENOTCONN; | |
1221 | break; | |
1222 | } | |
1223 | err = pipe_handler_enable_pipe(sk, val); | |
1224 | break; | |
1225 | #endif | |
1226 | ||
02a47617 RDC |
1227 | default: |
1228 | err = -ENOPROTOOPT; | |
1229 | } | |
1230 | release_sock(sk); | |
1231 | ||
1232 | out_norel: | |
1233 | return err; | |
1234 | } | |
1235 | ||
1236 | static int pep_getsockopt(struct sock *sk, int level, int optname, | |
1237 | char __user *optval, int __user *optlen) | |
1238 | { | |
1239 | struct pep_sock *pn = pep_sk(sk); | |
1240 | int len, val; | |
1241 | ||
1242 | if (level != SOL_PNPIPE) | |
1243 | return -ENOPROTOOPT; | |
1244 | if (get_user(len, optlen)) | |
1245 | return -EFAULT; | |
1246 | ||
1247 | switch (optname) { | |
1248 | case PNPIPE_ENCAP: | |
1249 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; | |
1250 | break; | |
8d98efa8 | 1251 | |
03789f26 RDC |
1252 | case PNPIPE_IFINDEX: |
1253 | val = pn->ifindex; | |
1254 | break; | |
1255 | ||
8d98efa8 | 1256 | #ifdef CONFIG_PHONET_PIPECTRLR |
03789f26 RDC |
1257 | case PNPIPE_ENABLE: |
1258 | if (pn->pipe_state <= PIPE_IDLE) | |
1259 | return -ENOTCONN; | |
1260 | val = pn->pipe_state != PIPE_DISABLED; | |
8d98efa8 KS |
1261 | break; |
1262 | #endif | |
1263 | ||
02a47617 RDC |
1264 | default: |
1265 | return -ENOPROTOOPT; | |
1266 | } | |
1267 | ||
1268 | len = min_t(unsigned int, sizeof(int), len); | |
1269 | if (put_user(len, optlen)) | |
1270 | return -EFAULT; | |
1271 | if (put_user(val, (int __user *) optval)) | |
1272 | return -EFAULT; | |
1273 | return 0; | |
1274 | } | |
1275 | ||
1276 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) | |
1277 | { | |
1278 | struct pep_sock *pn = pep_sk(sk); | |
1279 | struct pnpipehdr *ph; | |
e1a5964f | 1280 | int err; |
8d98efa8 KS |
1281 | #ifdef CONFIG_PHONET_PIPECTRLR |
1282 | struct sockaddr_pn spn = { | |
1283 | .spn_family = AF_PHONET, | |
1284 | .spn_resource = 0xD9, | |
1285 | .spn_dev = pn_dev(pn->remote_pep), | |
1286 | .spn_obj = pn_obj(pn->remote_pep), | |
1287 | }; | |
1288 | #endif | |
02a47617 | 1289 | |
be677730 RDC |
1290 | if (pn_flow_safe(pn->tx_fc) && |
1291 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { | |
1292 | kfree_skb(skb); | |
1293 | return -ENOBUFS; | |
1294 | } | |
1295 | ||
fea93ece | 1296 | skb_push(skb, 3 + pn->aligned); |
02a47617 RDC |
1297 | skb_reset_transport_header(skb); |
1298 | ph = pnp_hdr(skb); | |
1299 | ph->utid = 0; | |
fea93ece RDC |
1300 | if (pn->aligned) { |
1301 | ph->message_id = PNS_PIPE_ALIGNED_DATA; | |
1302 | ph->data[0] = 0; /* padding */ | |
1303 | } else | |
1304 | ph->message_id = PNS_PIPE_DATA; | |
02a47617 | 1305 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 | 1306 | #ifdef CONFIG_PHONET_PIPECTRLR |
e1a5964f | 1307 | err = pn_skb_send(sk, skb, &spn); |
8d98efa8 | 1308 | #else |
e1a5964f | 1309 | err = pn_skb_send(sk, skb, &pipe_srv); |
8d98efa8 | 1310 | #endif |
e1a5964f RDC |
1311 | |
1312 | if (err && pn_flow_safe(pn->tx_fc)) | |
1313 | atomic_inc(&pn->tx_credits); | |
1314 | return err; | |
1315 | ||
02a47617 RDC |
1316 | } |
1317 | ||
9641458d RDC |
1318 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
1319 | struct msghdr *msg, size_t len) | |
1320 | { | |
1321 | struct pep_sock *pn = pep_sk(sk); | |
b1704374 | 1322 | struct sk_buff *skb; |
9641458d RDC |
1323 | long timeo; |
1324 | int flags = msg->msg_flags; | |
1325 | int err, done; | |
1326 | ||
82ecbcb9 RDC |
1327 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
1328 | MSG_CMSG_COMPAT)) || | |
1329 | !(msg->msg_flags & MSG_EOR)) | |
9641458d RDC |
1330 | return -EOPNOTSUPP; |
1331 | ||
b1704374 RDC |
1332 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
1333 | flags & MSG_DONTWAIT, &err); | |
1334 | if (!skb) | |
02ac3268 | 1335 | return err; |
b1704374 RDC |
1336 | |
1337 | skb_reserve(skb, MAX_PHONET_HEADER + 3); | |
1338 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1339 | if (err < 0) | |
1340 | goto outfree; | |
1341 | ||
9641458d RDC |
1342 | lock_sock(sk); |
1343 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1344 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { | |
1345 | err = -ENOTCONN; | |
1346 | goto out; | |
1347 | } | |
1348 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1349 | /* Wait until the pipe gets to enabled state */ | |
1350 | disabled: | |
1351 | err = sk_stream_wait_connect(sk, &timeo); | |
1352 | if (err) | |
1353 | goto out; | |
1354 | ||
1355 | if (sk->sk_state == TCP_CLOSE_WAIT) { | |
1356 | err = -ECONNRESET; | |
1357 | goto out; | |
1358 | } | |
1359 | } | |
1360 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
1361 | ||
1362 | /* Wait until flow control allows TX */ | |
be677730 | 1363 | done = atomic_read(&pn->tx_credits); |
9641458d RDC |
1364 | while (!done) { |
1365 | DEFINE_WAIT(wait); | |
1366 | ||
1367 | if (!timeo) { | |
1368 | err = -EAGAIN; | |
1369 | goto out; | |
1370 | } | |
1371 | if (signal_pending(current)) { | |
1372 | err = sock_intr_errno(timeo); | |
1373 | goto out; | |
1374 | } | |
1375 | ||
43815482 | 1376 | prepare_to_wait(sk_sleep(sk), &wait, |
9641458d | 1377 | TASK_INTERRUPTIBLE); |
be677730 | 1378 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
43815482 | 1379 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
1380 | |
1381 | if (sk->sk_state != TCP_ESTABLISHED) | |
1382 | goto disabled; | |
1383 | } | |
1384 | ||
02a47617 | 1385 | err = pipe_skb_send(sk, skb); |
9641458d RDC |
1386 | if (err >= 0) |
1387 | err = len; /* success! */ | |
1388 | skb = NULL; | |
1389 | out: | |
1390 | release_sock(sk); | |
b1704374 | 1391 | outfree: |
9641458d RDC |
1392 | kfree_skb(skb); |
1393 | return err; | |
1394 | } | |
1395 | ||
02a47617 RDC |
1396 | int pep_writeable(struct sock *sk) |
1397 | { | |
1398 | struct pep_sock *pn = pep_sk(sk); | |
1399 | ||
be677730 | 1400 | return atomic_read(&pn->tx_credits); |
02a47617 RDC |
1401 | } |
1402 | ||
1403 | int pep_write(struct sock *sk, struct sk_buff *skb) | |
1404 | { | |
1405 | struct sk_buff *rskb, *fs; | |
1406 | int flen = 0; | |
1407 | ||
fea93ece RDC |
1408 | if (pep_sk(sk)->aligned) |
1409 | return pipe_skb_send(sk, skb); | |
1410 | ||
02a47617 RDC |
1411 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
1412 | if (!rskb) { | |
1413 | kfree_skb(skb); | |
1414 | return -ENOMEM; | |
1415 | } | |
1416 | skb_shinfo(rskb)->frag_list = skb; | |
1417 | rskb->len += skb->len; | |
1418 | rskb->data_len += rskb->len; | |
1419 | rskb->truesize += rskb->len; | |
1420 | ||
1421 | /* Avoid nested fragments */ | |
5c313e9a | 1422 | skb_walk_frags(skb, fs) |
02a47617 RDC |
1423 | flen += fs->len; |
1424 | skb->next = skb_shinfo(skb)->frag_list; | |
5c313e9a | 1425 | skb_frag_list_init(skb); |
02a47617 RDC |
1426 | skb->len -= flen; |
1427 | skb->data_len -= flen; | |
1428 | skb->truesize -= flen; | |
1429 | ||
1430 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); | |
1431 | return pipe_skb_send(sk, rskb); | |
1432 | } | |
1433 | ||
1434 | struct sk_buff *pep_read(struct sock *sk) | |
1435 | { | |
1436 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); | |
1437 | ||
1438 | if (sk->sk_state == TCP_ESTABLISHED) | |
1439 | pipe_grant_credits(sk); | |
1440 | return skb; | |
1441 | } | |
1442 | ||
9641458d RDC |
1443 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
1444 | struct msghdr *msg, size_t len, int noblock, | |
1445 | int flags, int *addr_len) | |
1446 | { | |
1447 | struct sk_buff *skb; | |
1448 | int err; | |
1449 | ||
82ecbcb9 RDC |
1450 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
1451 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) | |
1452 | return -EOPNOTSUPP; | |
1453 | ||
9641458d RDC |
1454 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
1455 | return -ENOTCONN; | |
1456 | ||
c41bd97f RDC |
1457 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
1458 | /* Dequeue and acknowledge control request */ | |
1459 | struct pep_sock *pn = pep_sk(sk); | |
1460 | ||
82ecbcb9 RDC |
1461 | if (flags & MSG_PEEK) |
1462 | return -EOPNOTSUPP; | |
c41bd97f RDC |
1463 | skb = skb_dequeue(&pn->ctrlreq_queue); |
1464 | if (skb) { | |
1465 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, | |
1466 | GFP_KERNEL); | |
1467 | msg->msg_flags |= MSG_OOB; | |
1468 | goto copy; | |
1469 | } | |
1470 | if (flags & MSG_OOB) | |
1471 | return -EINVAL; | |
1472 | } | |
1473 | ||
9641458d RDC |
1474 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1475 | lock_sock(sk); | |
1476 | if (skb == NULL) { | |
1477 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) | |
1478 | err = -ECONNRESET; | |
1479 | release_sock(sk); | |
1480 | return err; | |
1481 | } | |
1482 | ||
1483 | if (sk->sk_state == TCP_ESTABLISHED) | |
1484 | pipe_grant_credits(sk); | |
1485 | release_sock(sk); | |
c41bd97f | 1486 | copy: |
9641458d | 1487 | msg->msg_flags |= MSG_EOR; |
9641458d RDC |
1488 | if (skb->len > len) |
1489 | msg->msg_flags |= MSG_TRUNC; | |
1490 | else | |
1491 | len = skb->len; | |
1492 | ||
1493 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
1494 | if (!err) | |
1495 | err = (flags & MSG_TRUNC) ? skb->len : len; | |
1496 | ||
1497 | skb_free_datagram(sk, skb); | |
1498 | return err; | |
1499 | } | |
1500 | ||
1501 | static void pep_sock_unhash(struct sock *sk) | |
1502 | { | |
1503 | struct pep_sock *pn = pep_sk(sk); | |
1504 | struct sock *skparent = NULL; | |
1505 | ||
1506 | lock_sock(sk); | |
1507 | if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) { | |
1508 | skparent = pn->listener; | |
9641458d RDC |
1509 | release_sock(sk); |
1510 | ||
9641458d | 1511 | pn = pep_sk(skparent); |
7dfde179 RDC |
1512 | lock_sock(skparent); |
1513 | sk_del_node_init(sk); | |
1514 | sk = skparent; | |
9641458d RDC |
1515 | } |
1516 | /* Unhash a listening sock only when it is closed | |
1517 | * and all of its active connected pipes are closed. */ | |
1518 | if (hlist_empty(&pn->hlist)) | |
1519 | pn_sock_unhash(&pn->pn_sk.sk); | |
1520 | release_sock(sk); | |
1521 | ||
1522 | if (skparent) | |
1523 | sock_put(skparent); | |
1524 | } | |
1525 | ||
1526 | static struct proto pep_proto = { | |
1527 | .close = pep_sock_close, | |
1528 | .accept = pep_sock_accept, | |
1529 | .ioctl = pep_ioctl, | |
1530 | .init = pep_init, | |
02a47617 RDC |
1531 | .setsockopt = pep_setsockopt, |
1532 | .getsockopt = pep_getsockopt, | |
9641458d RDC |
1533 | .sendmsg = pep_sendmsg, |
1534 | .recvmsg = pep_recvmsg, | |
1535 | .backlog_rcv = pep_do_rcv, | |
1536 | .hash = pn_sock_hash, | |
1537 | .unhash = pep_sock_unhash, | |
1538 | .get_port = pn_sock_get_port, | |
1539 | .obj_size = sizeof(struct pep_sock), | |
1540 | .owner = THIS_MODULE, | |
1541 | .name = "PNPIPE", | |
1542 | }; | |
1543 | ||
1544 | static struct phonet_protocol pep_pn_proto = { | |
1545 | .ops = &phonet_stream_ops, | |
1546 | .prot = &pep_proto, | |
1547 | .sock_type = SOCK_SEQPACKET, | |
1548 | }; | |
1549 | ||
1550 | static int __init pep_register(void) | |
1551 | { | |
1552 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); | |
1553 | } | |
1554 | ||
1555 | static void __exit pep_unregister(void) | |
1556 | { | |
1557 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); | |
1558 | } | |
1559 | ||
1560 | module_init(pep_register); | |
1561 | module_exit(pep_unregister); | |
1562 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); | |
1563 | MODULE_DESCRIPTION("Phonet pipe protocol"); | |
1564 | MODULE_LICENSE("GPL"); | |
1565 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |