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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 | ||
9641458d RDC |
53 | #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */ |
54 | ||
55 | /* Get the next TLV sub-block. */ | |
56 | static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen, | |
57 | void *buf) | |
58 | { | |
59 | void *data = NULL; | |
60 | struct { | |
61 | u8 sb_type; | |
62 | u8 sb_len; | |
63 | } *ph, h; | |
64 | int buflen = *plen; | |
65 | ||
66 | ph = skb_header_pointer(skb, 0, 2, &h); | |
67 | if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len)) | |
68 | return NULL; | |
69 | ph->sb_len -= 2; | |
70 | *ptype = ph->sb_type; | |
71 | *plen = ph->sb_len; | |
72 | ||
73 | if (buflen > ph->sb_len) | |
74 | buflen = ph->sb_len; | |
75 | data = skb_header_pointer(skb, 2, buflen, buf); | |
76 | __skb_pull(skb, 2 + ph->sb_len); | |
77 | return data; | |
78 | } | |
79 | ||
80 | static int pep_reply(struct sock *sk, struct sk_buff *oskb, | |
81 | u8 code, const void *data, int len, gfp_t priority) | |
82 | { | |
83 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
84 | struct pnpipehdr *ph; | |
85 | struct sk_buff *skb; | |
14ba8fae | 86 | struct sockaddr_pn peer; |
9641458d RDC |
87 | |
88 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
89 | if (!skb) | |
90 | return -ENOMEM; | |
91 | skb_set_owner_w(skb, sk); | |
92 | ||
93 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
94 | __skb_put(skb, len); | |
95 | skb_copy_to_linear_data(skb, data, len); | |
96 | __skb_push(skb, sizeof(*ph)); | |
97 | skb_reset_transport_header(skb); | |
98 | ph = pnp_hdr(skb); | |
99 | ph->utid = oph->utid; | |
100 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ | |
101 | ph->pipe_handle = oph->pipe_handle; | |
102 | ph->error_code = code; | |
103 | ||
14ba8fae RDC |
104 | pn_skb_get_src_sockaddr(oskb, &peer); |
105 | return pn_skb_send(sk, skb, &peer); | |
9641458d RDC |
106 | } |
107 | ||
108 | #define PAD 0x00 | |
8d98efa8 KS |
109 | |
110 | #ifdef CONFIG_PHONET_PIPECTRLR | |
111 | static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len) | |
112 | { | |
113 | int i, j; | |
114 | u8 base_fc, final_fc; | |
115 | ||
116 | for (i = 0; i < len; i++) { | |
117 | base_fc = host_fc[i]; | |
118 | for (j = 0; j < len; j++) { | |
119 | if (remote_fc[j] == base_fc) { | |
120 | final_fc = base_fc; | |
121 | goto done; | |
122 | } | |
123 | } | |
124 | } | |
125 | return -EINVAL; | |
126 | ||
127 | done: | |
128 | return final_fc; | |
129 | ||
130 | } | |
131 | ||
132 | static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb, | |
133 | u8 *pref_rx_fc, u8 *req_tx_fc) | |
134 | { | |
135 | struct pnpipehdr *hdr; | |
136 | u8 n_sb; | |
137 | ||
138 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
139 | return -EINVAL; | |
140 | ||
141 | hdr = pnp_hdr(skb); | |
142 | n_sb = hdr->data[4]; | |
143 | ||
144 | __skb_pull(skb, sizeof(*hdr) + 4); | |
145 | while (n_sb > 0) { | |
146 | u8 type, buf[3], len = sizeof(buf); | |
147 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
148 | ||
149 | if (data == NULL) | |
150 | return -EINVAL; | |
151 | ||
152 | switch (type) { | |
153 | case PN_PIPE_SB_REQUIRED_FC_TX: | |
154 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
155 | break; | |
156 | req_tx_fc[0] = data[2]; | |
157 | req_tx_fc[1] = data[3]; | |
158 | req_tx_fc[2] = data[4]; | |
159 | break; | |
160 | ||
161 | case PN_PIPE_SB_PREFERRED_FC_RX: | |
162 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
163 | break; | |
164 | pref_rx_fc[0] = data[2]; | |
165 | pref_rx_fc[1] = data[3]; | |
166 | pref_rx_fc[2] = data[4]; | |
167 | break; | |
168 | ||
169 | } | |
170 | n_sb--; | |
171 | } | |
172 | return 0; | |
173 | } | |
174 | ||
b3d62553 KS |
175 | static int pipe_handler_send_req(struct sock *sk, u8 utid, |
176 | u8 msg_id, gfp_t priority) | |
8d98efa8 KS |
177 | { |
178 | int len; | |
179 | struct pnpipehdr *ph; | |
180 | struct sk_buff *skb; | |
b3d62553 | 181 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
182 | |
183 | static const u8 data[4] = { | |
184 | PAD, PAD, PAD, PAD, | |
185 | }; | |
186 | ||
187 | switch (msg_id) { | |
188 | case PNS_PEP_CONNECT_REQ: | |
189 | len = sizeof(data); | |
190 | break; | |
191 | ||
192 | case PNS_PEP_DISCONNECT_REQ: | |
193 | case PNS_PEP_ENABLE_REQ: | |
194 | case PNS_PEP_DISABLE_REQ: | |
195 | len = 0; | |
196 | break; | |
197 | ||
198 | default: | |
199 | return -EINVAL; | |
200 | } | |
201 | ||
202 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
203 | if (!skb) | |
204 | return -ENOMEM; | |
205 | skb_set_owner_w(skb, sk); | |
206 | ||
207 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
208 | if (len) { | |
209 | __skb_put(skb, len); | |
210 | skb_copy_to_linear_data(skb, data, len); | |
211 | } | |
212 | __skb_push(skb, sizeof(*ph)); | |
213 | skb_reset_transport_header(skb); | |
214 | ph = pnp_hdr(skb); | |
215 | ph->utid = utid; | |
216 | ph->message_id = msg_id; | |
b3d62553 | 217 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
218 | ph->error_code = PN_PIPE_NO_ERROR; |
219 | ||
14ba8fae | 220 | return pn_skb_send(sk, skb, NULL); |
8d98efa8 KS |
221 | } |
222 | ||
b3d62553 KS |
223 | static int pipe_handler_send_created_ind(struct sock *sk, |
224 | u8 utid, u8 msg_id) | |
8d98efa8 KS |
225 | { |
226 | int err_code; | |
227 | struct pnpipehdr *ph; | |
228 | struct sk_buff *skb; | |
8d98efa8 | 229 | |
b3d62553 | 230 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
231 | static u8 data[4] = { |
232 | 0x03, 0x04, | |
233 | }; | |
b3d62553 KS |
234 | data[2] = pn->tx_fc; |
235 | data[3] = pn->rx_fc; | |
8d98efa8 KS |
236 | |
237 | /* | |
238 | * actually, below is number of sub-blocks and not error code. | |
239 | * Pipe_created_ind message format does not have any | |
240 | * error code field. However, the Phonet stack will always send | |
241 | * an error code as part of pnpipehdr. So, use that err_code to | |
242 | * specify the number of sub-blocks. | |
243 | */ | |
244 | err_code = 0x01; | |
245 | ||
246 | skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC); | |
247 | if (!skb) | |
248 | return -ENOMEM; | |
249 | skb_set_owner_w(skb, sk); | |
250 | ||
251 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
252 | __skb_put(skb, sizeof(data)); | |
253 | skb_copy_to_linear_data(skb, data, sizeof(data)); | |
254 | __skb_push(skb, sizeof(*ph)); | |
255 | skb_reset_transport_header(skb); | |
256 | ph = pnp_hdr(skb); | |
257 | ph->utid = utid; | |
258 | ph->message_id = msg_id; | |
b3d62553 | 259 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
260 | ph->error_code = err_code; |
261 | ||
14ba8fae | 262 | return pn_skb_send(sk, skb, NULL); |
8d98efa8 KS |
263 | } |
264 | ||
b3d62553 | 265 | static int pipe_handler_send_ind(struct sock *sk, u8 utid, u8 msg_id) |
8d98efa8 KS |
266 | { |
267 | int err_code; | |
268 | struct pnpipehdr *ph; | |
269 | struct sk_buff *skb; | |
b3d62553 | 270 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
271 | |
272 | /* | |
273 | * actually, below is a filler. | |
274 | * Pipe_enabled/disabled_ind message format does not have any | |
275 | * error code field. However, the Phonet stack will always send | |
276 | * an error code as part of pnpipehdr. So, use that err_code to | |
277 | * specify the filler value. | |
278 | */ | |
279 | err_code = 0x0; | |
280 | ||
281 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); | |
282 | if (!skb) | |
283 | return -ENOMEM; | |
284 | skb_set_owner_w(skb, sk); | |
285 | ||
286 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
287 | __skb_push(skb, sizeof(*ph)); | |
288 | skb_reset_transport_header(skb); | |
289 | ph = pnp_hdr(skb); | |
290 | ph->utid = utid; | |
291 | ph->message_id = msg_id; | |
b3d62553 | 292 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
293 | ph->error_code = err_code; |
294 | ||
14ba8fae | 295 | return pn_skb_send(sk, skb, NULL); |
8d98efa8 KS |
296 | } |
297 | ||
03789f26 | 298 | static int pipe_handler_enable_pipe(struct sock *sk, int enable) |
8d98efa8 | 299 | { |
03789f26 RDC |
300 | int utid, req; |
301 | ||
302 | if (enable) { | |
303 | utid = PNS_PIPE_ENABLE_UTID; | |
304 | req = PNS_PEP_ENABLE_REQ; | |
305 | } else { | |
306 | utid = PNS_PIPE_DISABLE_UTID; | |
307 | req = PNS_PEP_DISABLE_REQ; | |
8d98efa8 | 308 | } |
b3d62553 | 309 | return pipe_handler_send_req(sk, utid, req, GFP_ATOMIC); |
8d98efa8 KS |
310 | } |
311 | #endif | |
312 | ||
9641458d RDC |
313 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
314 | { | |
315 | static const u8 data[20] = { | |
316 | PAD, PAD, PAD, 2 /* sub-blocks */, | |
317 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, | |
318 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
319 | PN_ONE_CREDIT_FLOW_CONTROL, | |
320 | PN_LEGACY_FLOW_CONTROL, | |
321 | PAD, | |
322 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, | |
323 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
324 | PN_ONE_CREDIT_FLOW_CONTROL, | |
325 | PN_LEGACY_FLOW_CONTROL, | |
326 | PAD, | |
327 | }; | |
328 | ||
329 | might_sleep(); | |
330 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), | |
331 | GFP_KERNEL); | |
332 | } | |
333 | ||
334 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code) | |
335 | { | |
336 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; | |
337 | WARN_ON(code == PN_PIPE_NO_ERROR); | |
338 | return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC); | |
339 | } | |
340 | ||
341 | /* Control requests are not sent by the pipe service and have a specific | |
342 | * message format. */ | |
c41bd97f RDC |
343 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
344 | gfp_t priority) | |
9641458d RDC |
345 | { |
346 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
347 | struct sk_buff *skb; | |
348 | struct pnpipehdr *ph; | |
349 | struct sockaddr_pn dst; | |
350 | ||
c41bd97f | 351 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); |
9641458d RDC |
352 | if (!skb) |
353 | return -ENOMEM; | |
354 | skb_set_owner_w(skb, sk); | |
355 | ||
356 | skb_reserve(skb, MAX_PHONET_HEADER); | |
357 | ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4); | |
358 | ||
359 | ph->utid = oph->utid; | |
360 | ph->message_id = PNS_PEP_CTRL_RESP; | |
361 | ph->pipe_handle = oph->pipe_handle; | |
362 | ph->data[0] = oph->data[1]; /* CTRL id */ | |
363 | ph->data[1] = oph->data[0]; /* PEP type */ | |
364 | ph->data[2] = code; /* error code, at an usual offset */ | |
365 | ph->data[3] = PAD; | |
366 | ph->data[4] = PAD; | |
367 | ||
368 | pn_skb_get_src_sockaddr(oskb, &dst); | |
369 | return pn_skb_send(sk, skb, &dst); | |
370 | } | |
371 | ||
372 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) | |
373 | { | |
374 | struct pep_sock *pn = pep_sk(sk); | |
375 | struct pnpipehdr *ph; | |
376 | struct sk_buff *skb; | |
377 | ||
378 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); | |
379 | if (!skb) | |
380 | return -ENOMEM; | |
381 | skb_set_owner_w(skb, sk); | |
382 | ||
383 | skb_reserve(skb, MAX_PNPIPE_HEADER + 4); | |
384 | __skb_push(skb, sizeof(*ph) + 4); | |
385 | skb_reset_transport_header(skb); | |
386 | ph = pnp_hdr(skb); | |
387 | ph->utid = 0; | |
388 | ph->message_id = PNS_PEP_STATUS_IND; | |
389 | ph->pipe_handle = pn->pipe_handle; | |
390 | ph->pep_type = PN_PEP_TYPE_COMMON; | |
391 | ph->data[1] = type; | |
392 | ph->data[2] = PAD; | |
393 | ph->data[3] = PAD; | |
394 | ph->data[4] = status; | |
395 | ||
14ba8fae | 396 | return pn_skb_send(sk, skb, NULL); |
9641458d RDC |
397 | } |
398 | ||
399 | /* Send our RX flow control information to the sender. | |
400 | * Socket must be locked. */ | |
401 | static void pipe_grant_credits(struct sock *sk) | |
402 | { | |
403 | struct pep_sock *pn = pep_sk(sk); | |
404 | ||
405 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
406 | ||
407 | switch (pn->rx_fc) { | |
408 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ | |
409 | break; | |
410 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
411 | pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, | |
412 | PEP_IND_READY, GFP_ATOMIC); | |
413 | pn->rx_credits = 1; | |
414 | break; | |
415 | case PN_MULTI_CREDIT_FLOW_CONTROL: | |
416 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) | |
417 | break; | |
418 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, | |
419 | CREDITS_MAX - pn->rx_credits, | |
420 | GFP_ATOMIC) == 0) | |
421 | pn->rx_credits = CREDITS_MAX; | |
422 | break; | |
423 | } | |
424 | } | |
425 | ||
426 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) | |
427 | { | |
428 | struct pep_sock *pn = pep_sk(sk); | |
a91e7d47 | 429 | struct pnpipehdr *hdr; |
be677730 | 430 | int wake = 0; |
9641458d RDC |
431 | |
432 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
433 | return -EINVAL; | |
434 | ||
a91e7d47 | 435 | hdr = pnp_hdr(skb); |
9641458d RDC |
436 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
437 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", | |
438 | (unsigned)hdr->data[0]); | |
439 | return -EOPNOTSUPP; | |
440 | } | |
441 | ||
442 | switch (hdr->data[1]) { | |
443 | case PN_PEP_IND_FLOW_CONTROL: | |
444 | switch (pn->tx_fc) { | |
445 | case PN_LEGACY_FLOW_CONTROL: | |
446 | switch (hdr->data[4]) { | |
447 | case PEP_IND_BUSY: | |
be677730 | 448 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
449 | break; |
450 | case PEP_IND_READY: | |
be677730 | 451 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
452 | break; |
453 | } | |
454 | break; | |
455 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
456 | if (hdr->data[4] == PEP_IND_READY) | |
be677730 | 457 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
458 | break; |
459 | } | |
460 | break; | |
461 | ||
462 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: | |
463 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) | |
464 | break; | |
be677730 | 465 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
9641458d RDC |
466 | break; |
467 | ||
468 | default: | |
469 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", | |
470 | (unsigned)hdr->data[1]); | |
471 | return -EOPNOTSUPP; | |
472 | } | |
be677730 | 473 | if (wake) |
9641458d RDC |
474 | sk->sk_write_space(sk); |
475 | return 0; | |
476 | } | |
477 | ||
478 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) | |
479 | { | |
480 | struct pep_sock *pn = pep_sk(sk); | |
481 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
482 | u8 n_sb = hdr->data[0]; | |
483 | ||
484 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
485 | __skb_pull(skb, sizeof(*hdr)); | |
486 | while (n_sb > 0) { | |
487 | u8 type, buf[2], len = sizeof(buf); | |
488 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
489 | ||
490 | if (data == NULL) | |
491 | return -EINVAL; | |
492 | switch (type) { | |
493 | case PN_PIPE_SB_NEGOTIATED_FC: | |
494 | if (len < 2 || (data[0] | data[1]) > 3) | |
495 | break; | |
496 | pn->tx_fc = data[0] & 3; | |
497 | pn->rx_fc = data[1] & 3; | |
498 | break; | |
499 | } | |
500 | n_sb--; | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
505 | /* Queue an skb to a connected sock. | |
506 | * Socket lock must be held. */ | |
507 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) | |
508 | { | |
509 | struct pep_sock *pn = pep_sk(sk); | |
510 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
c41bd97f | 511 | struct sk_buff_head *queue; |
9641458d RDC |
512 | int err = 0; |
513 | ||
514 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); | |
515 | ||
516 | switch (hdr->message_id) { | |
517 | case PNS_PEP_CONNECT_REQ: | |
518 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
519 | break; | |
520 | ||
521 | case PNS_PEP_DISCONNECT_REQ: | |
522 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
523 | sk->sk_state = TCP_CLOSE_WAIT; | |
524 | if (!sock_flag(sk, SOCK_DEAD)) | |
525 | sk->sk_state_change(sk); | |
526 | break; | |
527 | ||
8d98efa8 KS |
528 | #ifdef CONFIG_PHONET_PIPECTRLR |
529 | case PNS_PEP_DISCONNECT_RESP: | |
530 | pn->pipe_state = PIPE_IDLE; | |
b3d62553 | 531 | sk->sk_state = TCP_CLOSE; |
8d98efa8 KS |
532 | break; |
533 | #endif | |
534 | ||
9641458d RDC |
535 | case PNS_PEP_ENABLE_REQ: |
536 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ | |
537 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
538 | break; | |
539 | ||
8d98efa8 KS |
540 | #ifdef CONFIG_PHONET_PIPECTRLR |
541 | case PNS_PEP_ENABLE_RESP: | |
b3d62553 KS |
542 | pn->pipe_state = PIPE_ENABLED; |
543 | pipe_handler_send_ind(sk, PNS_PIPE_ENABLED_IND_UTID, | |
544 | PNS_PIPE_ENABLED_IND); | |
8d98efa8 | 545 | |
b3d62553 KS |
546 | if (!pn_flow_safe(pn->tx_fc)) { |
547 | atomic_set(&pn->tx_credits, 1); | |
548 | sk->sk_write_space(sk); | |
549 | } | |
550 | if (sk->sk_state == TCP_ESTABLISHED) | |
551 | break; /* Nothing to do */ | |
552 | sk->sk_state = TCP_ESTABLISHED; | |
553 | pipe_grant_credits(sk); | |
8d98efa8 KS |
554 | break; |
555 | #endif | |
556 | ||
9641458d RDC |
557 | case PNS_PEP_RESET_REQ: |
558 | switch (hdr->state_after_reset) { | |
559 | case PN_PIPE_DISABLE: | |
560 | pn->init_enable = 0; | |
561 | break; | |
562 | case PN_PIPE_ENABLE: | |
563 | pn->init_enable = 1; | |
564 | break; | |
565 | default: /* not allowed to send an error here!? */ | |
566 | err = -EINVAL; | |
567 | goto out; | |
568 | } | |
569 | /* fall through */ | |
570 | case PNS_PEP_DISABLE_REQ: | |
be677730 | 571 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
572 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
573 | break; | |
574 | ||
8d98efa8 KS |
575 | #ifdef CONFIG_PHONET_PIPECTRLR |
576 | case PNS_PEP_DISABLE_RESP: | |
b3d62553 KS |
577 | pn->pipe_state = PIPE_DISABLED; |
578 | atomic_set(&pn->tx_credits, 0); | |
579 | pipe_handler_send_ind(sk, PNS_PIPE_DISABLED_IND_UTID, | |
580 | PNS_PIPE_DISABLED_IND); | |
581 | sk->sk_state = TCP_SYN_RECV; | |
582 | pn->rx_credits = 0; | |
8d98efa8 KS |
583 | break; |
584 | #endif | |
585 | ||
9641458d | 586 | case PNS_PEP_CTRL_REQ: |
2e2fb4b3 RDC |
587 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
588 | atomic_inc(&sk->sk_drops); | |
c41bd97f | 589 | break; |
2e2fb4b3 | 590 | } |
c41bd97f RDC |
591 | __skb_pull(skb, 4); |
592 | queue = &pn->ctrlreq_queue; | |
593 | goto queue; | |
9641458d | 594 | |
fc6a1107 RDC |
595 | case PNS_PIPE_ALIGNED_DATA: |
596 | __skb_pull(skb, 1); | |
597 | /* fall through */ | |
9641458d RDC |
598 | case PNS_PIPE_DATA: |
599 | __skb_pull(skb, 3); /* Pipe data header */ | |
600 | if (!pn_flow_safe(pn->rx_fc)) { | |
601 | err = sock_queue_rcv_skb(sk, skb); | |
602 | if (!err) | |
603 | return 0; | |
604 | break; | |
605 | } | |
606 | ||
607 | if (pn->rx_credits == 0) { | |
2e2fb4b3 | 608 | atomic_inc(&sk->sk_drops); |
9641458d RDC |
609 | err = -ENOBUFS; |
610 | break; | |
611 | } | |
612 | pn->rx_credits--; | |
c41bd97f RDC |
613 | queue = &sk->sk_receive_queue; |
614 | goto queue; | |
9641458d RDC |
615 | |
616 | case PNS_PEP_STATUS_IND: | |
617 | pipe_rcv_status(sk, skb); | |
618 | break; | |
619 | ||
620 | case PNS_PIPE_REDIRECTED_IND: | |
621 | err = pipe_rcv_created(sk, skb); | |
622 | break; | |
623 | ||
624 | case PNS_PIPE_CREATED_IND: | |
625 | err = pipe_rcv_created(sk, skb); | |
626 | if (err) | |
627 | break; | |
628 | /* fall through */ | |
629 | case PNS_PIPE_RESET_IND: | |
630 | if (!pn->init_enable) | |
631 | break; | |
632 | /* fall through */ | |
633 | case PNS_PIPE_ENABLED_IND: | |
634 | if (!pn_flow_safe(pn->tx_fc)) { | |
be677730 | 635 | atomic_set(&pn->tx_credits, 1); |
9641458d RDC |
636 | sk->sk_write_space(sk); |
637 | } | |
638 | if (sk->sk_state == TCP_ESTABLISHED) | |
639 | break; /* Nothing to do */ | |
640 | sk->sk_state = TCP_ESTABLISHED; | |
641 | pipe_grant_credits(sk); | |
642 | break; | |
643 | ||
644 | case PNS_PIPE_DISABLED_IND: | |
645 | sk->sk_state = TCP_SYN_RECV; | |
646 | pn->rx_credits = 0; | |
647 | break; | |
648 | ||
649 | default: | |
650 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", | |
651 | hdr->message_id); | |
652 | err = -EINVAL; | |
653 | } | |
654 | out: | |
655 | kfree_skb(skb); | |
656 | return err; | |
c41bd97f RDC |
657 | |
658 | queue: | |
659 | skb->dev = NULL; | |
660 | skb_set_owner_r(skb, sk); | |
661 | err = skb->len; | |
662 | skb_queue_tail(queue, skb); | |
663 | if (!sock_flag(sk, SOCK_DEAD)) | |
664 | sk->sk_data_ready(sk, err); | |
665 | return 0; | |
9641458d RDC |
666 | } |
667 | ||
668 | /* Destroy connected sock. */ | |
669 | static void pipe_destruct(struct sock *sk) | |
670 | { | |
c41bd97f RDC |
671 | struct pep_sock *pn = pep_sk(sk); |
672 | ||
9641458d | 673 | skb_queue_purge(&sk->sk_receive_queue); |
c41bd97f | 674 | skb_queue_purge(&pn->ctrlreq_queue); |
9641458d RDC |
675 | } |
676 | ||
b3d62553 KS |
677 | #ifdef CONFIG_PHONET_PIPECTRLR |
678 | static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb) | |
679 | { | |
680 | struct pep_sock *pn = pep_sk(sk); | |
681 | u8 host_pref_rx_fc[3] = {3, 2, 1}, host_req_tx_fc[3] = {3, 2, 1}; | |
682 | u8 remote_pref_rx_fc[3], remote_req_tx_fc[3]; | |
683 | u8 negotiated_rx_fc, negotiated_tx_fc; | |
684 | int ret; | |
685 | ||
686 | pipe_get_flow_info(sk, skb, remote_pref_rx_fc, | |
687 | remote_req_tx_fc); | |
688 | negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc, | |
689 | host_pref_rx_fc, | |
690 | sizeof(host_pref_rx_fc)); | |
691 | negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc, | |
692 | remote_pref_rx_fc, | |
693 | sizeof(host_pref_rx_fc)); | |
694 | ||
695 | pn->pipe_state = PIPE_DISABLED; | |
696 | sk->sk_state = TCP_SYN_RECV; | |
697 | sk->sk_backlog_rcv = pipe_do_rcv; | |
698 | sk->sk_destruct = pipe_destruct; | |
699 | pn->rx_credits = 0; | |
700 | pn->rx_fc = negotiated_rx_fc; | |
701 | pn->tx_fc = negotiated_tx_fc; | |
702 | sk->sk_state_change(sk); | |
703 | ||
704 | ret = pipe_handler_send_created_ind(sk, | |
705 | PNS_PIPE_CREATED_IND_UTID, | |
706 | PNS_PIPE_CREATED_IND | |
707 | ); | |
708 | ||
709 | return ret; | |
710 | } | |
711 | #endif | |
712 | ||
9641458d RDC |
713 | static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) |
714 | { | |
715 | struct sock *newsk; | |
716 | struct pep_sock *newpn, *pn = pep_sk(sk); | |
717 | struct pnpipehdr *hdr; | |
14ba8fae | 718 | struct sockaddr_pn dst, src; |
9641458d RDC |
719 | u16 peer_type; |
720 | u8 pipe_handle, enabled, n_sb; | |
fea93ece | 721 | u8 aligned = 0; |
9641458d RDC |
722 | |
723 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) | |
724 | return -EINVAL; | |
725 | ||
726 | hdr = pnp_hdr(skb); | |
727 | pipe_handle = hdr->pipe_handle; | |
728 | switch (hdr->state_after_connect) { | |
729 | case PN_PIPE_DISABLE: | |
730 | enabled = 0; | |
731 | break; | |
732 | case PN_PIPE_ENABLE: | |
733 | enabled = 1; | |
734 | break; | |
735 | default: | |
736 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM); | |
737 | return -EINVAL; | |
738 | } | |
739 | peer_type = hdr->other_pep_type << 8; | |
740 | ||
741 | if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) { | |
742 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
743 | return -ENOBUFS; | |
744 | } | |
745 | ||
746 | /* Parse sub-blocks (options) */ | |
747 | n_sb = hdr->data[4]; | |
748 | while (n_sb > 0) { | |
749 | u8 type, buf[1], len = sizeof(buf); | |
750 | const u8 *data = pep_get_sb(skb, &type, &len, buf); | |
751 | ||
752 | if (data == NULL) | |
753 | return -EINVAL; | |
754 | switch (type) { | |
755 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: | |
756 | if (len < 1) | |
757 | return -EINVAL; | |
758 | peer_type = (peer_type & 0xff00) | data[0]; | |
759 | break; | |
fea93ece RDC |
760 | case PN_PIPE_SB_ALIGNED_DATA: |
761 | aligned = data[0] != 0; | |
762 | break; | |
9641458d RDC |
763 | } |
764 | n_sb--; | |
765 | } | |
766 | ||
767 | skb = skb_clone(skb, GFP_ATOMIC); | |
768 | if (!skb) | |
769 | return -ENOMEM; | |
770 | ||
771 | /* Create a new to-be-accepted sock */ | |
772 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot); | |
773 | if (!newsk) { | |
774 | kfree_skb(skb); | |
775 | return -ENOMEM; | |
776 | } | |
777 | sock_init_data(NULL, newsk); | |
778 | newsk->sk_state = TCP_SYN_RECV; | |
779 | newsk->sk_backlog_rcv = pipe_do_rcv; | |
780 | newsk->sk_protocol = sk->sk_protocol; | |
781 | newsk->sk_destruct = pipe_destruct; | |
782 | ||
783 | newpn = pep_sk(newsk); | |
784 | pn_skb_get_dst_sockaddr(skb, &dst); | |
14ba8fae | 785 | pn_skb_get_src_sockaddr(skb, &src); |
9641458d | 786 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); |
14ba8fae RDC |
787 | newpn->pn_sk.dobject = pn_sockaddr_get_object(&src); |
788 | newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst); | |
c41bd97f | 789 | skb_queue_head_init(&newpn->ctrlreq_queue); |
9641458d | 790 | newpn->pipe_handle = pipe_handle; |
be677730 | 791 | atomic_set(&newpn->tx_credits, 0); |
9641458d | 792 | newpn->peer_type = peer_type; |
be677730 | 793 | newpn->rx_credits = 0; |
9641458d RDC |
794 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
795 | newpn->init_enable = enabled; | |
fea93ece | 796 | newpn->aligned = aligned; |
9641458d RDC |
797 | |
798 | BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue)); | |
799 | skb_queue_head(&newsk->sk_receive_queue, skb); | |
800 | if (!sock_flag(sk, SOCK_DEAD)) | |
801 | sk->sk_data_ready(sk, 0); | |
802 | ||
803 | sk_acceptq_added(sk); | |
804 | sk_add_node(newsk, &pn->ackq); | |
805 | return 0; | |
806 | } | |
807 | ||
808 | /* Listening sock must be locked */ | |
809 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, | |
810 | const struct sockaddr_pn *dst, | |
811 | u8 pipe_handle) | |
812 | { | |
813 | struct hlist_node *node; | |
814 | struct sock *sknode; | |
815 | u16 dobj = pn_sockaddr_get_object(dst); | |
816 | ||
817 | sk_for_each(sknode, node, hlist) { | |
818 | struct pep_sock *pnnode = pep_sk(sknode); | |
819 | ||
820 | /* Ports match, but addresses might not: */ | |
821 | if (pnnode->pn_sk.sobject != dobj) | |
822 | continue; | |
823 | if (pnnode->pipe_handle != pipe_handle) | |
824 | continue; | |
825 | if (sknode->sk_state == TCP_CLOSE_WAIT) | |
826 | continue; | |
827 | ||
828 | sock_hold(sknode); | |
829 | return sknode; | |
830 | } | |
831 | return NULL; | |
832 | } | |
833 | ||
834 | /* | |
835 | * Deliver an skb to a listening sock. | |
836 | * Socket lock must be held. | |
837 | * We then queue the skb to the right connected sock (if any). | |
838 | */ | |
839 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) | |
840 | { | |
841 | struct pep_sock *pn = pep_sk(sk); | |
842 | struct sock *sknode; | |
2ddc1ac1 | 843 | struct pnpipehdr *hdr; |
9641458d RDC |
844 | struct sockaddr_pn dst; |
845 | int err = NET_RX_SUCCESS; | |
846 | u8 pipe_handle; | |
847 | ||
848 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
849 | goto drop; | |
850 | ||
851 | hdr = pnp_hdr(skb); | |
852 | pipe_handle = hdr->pipe_handle; | |
853 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) | |
854 | goto drop; | |
855 | ||
856 | pn_skb_get_dst_sockaddr(skb, &dst); | |
857 | ||
858 | /* Look for an existing pipe handle */ | |
859 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); | |
860 | if (sknode) | |
861 | return sk_receive_skb(sknode, skb, 1); | |
862 | ||
863 | /* Look for a pipe handle pending accept */ | |
864 | sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle); | |
865 | if (sknode) { | |
866 | sock_put(sknode); | |
867 | if (net_ratelimit()) | |
868 | printk(KERN_WARNING"Phonet unconnected PEP ignored"); | |
869 | err = NET_RX_DROP; | |
870 | goto drop; | |
871 | } | |
872 | ||
873 | switch (hdr->message_id) { | |
874 | case PNS_PEP_CONNECT_REQ: | |
875 | err = pep_connreq_rcv(sk, skb); | |
876 | break; | |
877 | ||
b3d62553 KS |
878 | #ifdef CONFIG_PHONET_PIPECTRLR |
879 | case PNS_PEP_CONNECT_RESP: | |
880 | err = pep_connresp_rcv(sk, skb); | |
881 | break; | |
882 | #endif | |
883 | ||
9641458d RDC |
884 | case PNS_PEP_DISCONNECT_REQ: |
885 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
886 | break; | |
887 | ||
888 | case PNS_PEP_CTRL_REQ: | |
c41bd97f | 889 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
9641458d RDC |
890 | break; |
891 | ||
892 | case PNS_PEP_RESET_REQ: | |
893 | case PNS_PEP_ENABLE_REQ: | |
894 | case PNS_PEP_DISABLE_REQ: | |
895 | /* invalid handle is not even allowed here! */ | |
896 | default: | |
897 | err = NET_RX_DROP; | |
898 | } | |
899 | drop: | |
900 | kfree_skb(skb); | |
901 | return err; | |
902 | } | |
903 | ||
6482f554 RDC |
904 | static int pipe_do_remove(struct sock *sk) |
905 | { | |
906 | struct pep_sock *pn = pep_sk(sk); | |
907 | struct pnpipehdr *ph; | |
908 | struct sk_buff *skb; | |
909 | ||
910 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL); | |
911 | if (!skb) | |
912 | return -ENOMEM; | |
913 | ||
914 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
915 | __skb_push(skb, sizeof(*ph)); | |
916 | skb_reset_transport_header(skb); | |
917 | ph = pnp_hdr(skb); | |
918 | ph->utid = 0; | |
919 | ph->message_id = PNS_PIPE_REMOVE_REQ; | |
920 | ph->pipe_handle = pn->pipe_handle; | |
921 | ph->data[0] = PAD; | |
922 | ||
14ba8fae | 923 | return pn_skb_send(sk, skb, NULL); |
6482f554 RDC |
924 | } |
925 | ||
9641458d RDC |
926 | /* associated socket ceases to exist */ |
927 | static void pep_sock_close(struct sock *sk, long timeout) | |
928 | { | |
929 | struct pep_sock *pn = pep_sk(sk); | |
02a47617 | 930 | int ifindex = 0; |
9641458d | 931 | |
e513480e | 932 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
9641458d RDC |
933 | sk_common_release(sk); |
934 | ||
935 | lock_sock(sk); | |
936 | if (sk->sk_state == TCP_LISTEN) { | |
937 | /* Destroy the listen queue */ | |
938 | struct sock *sknode; | |
939 | struct hlist_node *p, *n; | |
940 | ||
941 | sk_for_each_safe(sknode, p, n, &pn->ackq) | |
942 | sk_del_node_init(sknode); | |
943 | sk->sk_state = TCP_CLOSE; | |
6482f554 RDC |
944 | } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
945 | /* Forcefully remove dangling Phonet pipe */ | |
946 | pipe_do_remove(sk); | |
947 | ||
b3d62553 KS |
948 | #ifdef CONFIG_PHONET_PIPECTRLR |
949 | if (pn->pipe_state != PIPE_IDLE) { | |
950 | /* send pep disconnect request */ | |
951 | pipe_handler_send_req(sk, | |
952 | PNS_PEP_DISCONNECT_UTID, PNS_PEP_DISCONNECT_REQ, | |
953 | GFP_KERNEL); | |
954 | ||
955 | pn->pipe_state = PIPE_IDLE; | |
956 | sk->sk_state = TCP_CLOSE; | |
957 | } | |
958 | #endif | |
959 | ||
02a47617 RDC |
960 | ifindex = pn->ifindex; |
961 | pn->ifindex = 0; | |
9641458d | 962 | release_sock(sk); |
02a47617 RDC |
963 | |
964 | if (ifindex) | |
965 | gprs_detach(sk); | |
e513480e | 966 | sock_put(sk); |
9641458d RDC |
967 | } |
968 | ||
969 | static int pep_wait_connreq(struct sock *sk, int noblock) | |
970 | { | |
971 | struct task_struct *tsk = current; | |
972 | struct pep_sock *pn = pep_sk(sk); | |
973 | long timeo = sock_rcvtimeo(sk, noblock); | |
974 | ||
975 | for (;;) { | |
976 | DEFINE_WAIT(wait); | |
977 | ||
978 | if (sk->sk_state != TCP_LISTEN) | |
979 | return -EINVAL; | |
980 | if (!hlist_empty(&pn->ackq)) | |
981 | break; | |
982 | if (!timeo) | |
983 | return -EWOULDBLOCK; | |
984 | if (signal_pending(tsk)) | |
985 | return sock_intr_errno(timeo); | |
986 | ||
43815482 | 987 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
9641458d RDC |
988 | TASK_INTERRUPTIBLE); |
989 | release_sock(sk); | |
990 | timeo = schedule_timeout(timeo); | |
991 | lock_sock(sk); | |
43815482 | 992 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
993 | } |
994 | ||
995 | return 0; | |
996 | } | |
997 | ||
998 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) | |
999 | { | |
1000 | struct pep_sock *pn = pep_sk(sk); | |
1001 | struct sock *newsk = NULL; | |
1002 | struct sk_buff *oskb; | |
1003 | int err; | |
1004 | ||
1005 | lock_sock(sk); | |
1006 | err = pep_wait_connreq(sk, flags & O_NONBLOCK); | |
1007 | if (err) | |
1008 | goto out; | |
1009 | ||
1010 | newsk = __sk_head(&pn->ackq); | |
1011 | ||
1012 | oskb = skb_dequeue(&newsk->sk_receive_queue); | |
1013 | err = pep_accept_conn(newsk, oskb); | |
1014 | if (err) { | |
1015 | skb_queue_head(&newsk->sk_receive_queue, oskb); | |
1016 | newsk = NULL; | |
1017 | goto out; | |
1018 | } | |
635f0815 | 1019 | kfree_skb(oskb); |
9641458d RDC |
1020 | |
1021 | sock_hold(sk); | |
1022 | pep_sk(newsk)->listener = sk; | |
1023 | ||
1024 | sock_hold(newsk); | |
1025 | sk_del_node_init(newsk); | |
1026 | sk_acceptq_removed(sk); | |
1027 | sk_add_node(newsk, &pn->hlist); | |
1028 | __sock_put(newsk); | |
1029 | ||
1030 | out: | |
1031 | release_sock(sk); | |
1032 | *errp = err; | |
1033 | return newsk; | |
1034 | } | |
1035 | ||
b3d62553 KS |
1036 | #ifdef CONFIG_PHONET_PIPECTRLR |
1037 | static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len) | |
1038 | { | |
1039 | struct pep_sock *pn = pep_sk(sk); | |
14ba8fae | 1040 | const struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; |
b3d62553 | 1041 | |
14ba8fae RDC |
1042 | pn->pn_sk.dobject = pn_sockaddr_get_object(spn); |
1043 | pn->pn_sk.resource = pn_sockaddr_get_resource(spn); | |
b3d62553 KS |
1044 | return pipe_handler_send_req(sk, |
1045 | PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ, | |
1046 | GFP_ATOMIC); | |
1047 | } | |
1048 | #endif | |
1049 | ||
9641458d RDC |
1050 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1051 | { | |
c41bd97f | 1052 | struct pep_sock *pn = pep_sk(sk); |
9641458d RDC |
1053 | int answ; |
1054 | ||
1055 | switch (cmd) { | |
1056 | case SIOCINQ: | |
1057 | if (sk->sk_state == TCP_LISTEN) | |
1058 | return -EINVAL; | |
1059 | ||
1060 | lock_sock(sk); | |
f64f9e71 JP |
1061 | if (sock_flag(sk, SOCK_URGINLINE) && |
1062 | !skb_queue_empty(&pn->ctrlreq_queue)) | |
c41bd97f RDC |
1063 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
1064 | else if (!skb_queue_empty(&sk->sk_receive_queue)) | |
9641458d RDC |
1065 | answ = skb_peek(&sk->sk_receive_queue)->len; |
1066 | else | |
1067 | answ = 0; | |
1068 | release_sock(sk); | |
1069 | return put_user(answ, (int __user *)arg); | |
1070 | } | |
1071 | ||
1072 | return -ENOIOCTLCMD; | |
1073 | } | |
1074 | ||
1075 | static int pep_init(struct sock *sk) | |
1076 | { | |
1077 | struct pep_sock *pn = pep_sk(sk); | |
1078 | ||
1079 | INIT_HLIST_HEAD(&pn->ackq); | |
1080 | INIT_HLIST_HEAD(&pn->hlist); | |
c41bd97f | 1081 | skb_queue_head_init(&pn->ctrlreq_queue); |
9641458d RDC |
1082 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
1083 | return 0; | |
1084 | } | |
1085 | ||
02a47617 | 1086 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1087 | char __user *optval, unsigned int optlen) |
02a47617 RDC |
1088 | { |
1089 | struct pep_sock *pn = pep_sk(sk); | |
1090 | int val = 0, err = 0; | |
1091 | ||
1092 | if (level != SOL_PNPIPE) | |
1093 | return -ENOPROTOOPT; | |
1094 | if (optlen >= sizeof(int)) { | |
1095 | if (get_user(val, (int __user *) optval)) | |
1096 | return -EFAULT; | |
1097 | } | |
1098 | ||
1099 | lock_sock(sk); | |
1100 | switch (optname) { | |
8d98efa8 | 1101 | #ifdef CONFIG_PHONET_PIPECTRLR |
b3d62553 | 1102 | case PNPIPE_PIPE_HANDLE: |
8d98efa8 KS |
1103 | if (val) { |
1104 | if (pn->pipe_state > PIPE_IDLE) { | |
1105 | err = -EFAULT; | |
1106 | break; | |
1107 | } | |
b3d62553 | 1108 | pn->pipe_handle = val; |
8d98efa8 KS |
1109 | break; |
1110 | } | |
8d98efa8 KS |
1111 | #endif |
1112 | ||
02a47617 RDC |
1113 | case PNPIPE_ENCAP: |
1114 | if (val && val != PNPIPE_ENCAP_IP) { | |
1115 | err = -EINVAL; | |
1116 | break; | |
1117 | } | |
1118 | if (!pn->ifindex == !val) | |
1119 | break; /* Nothing to do! */ | |
1120 | if (!capable(CAP_NET_ADMIN)) { | |
1121 | err = -EPERM; | |
1122 | break; | |
1123 | } | |
1124 | if (val) { | |
1125 | release_sock(sk); | |
1126 | err = gprs_attach(sk); | |
1127 | if (err > 0) { | |
1128 | pn->ifindex = err; | |
1129 | err = 0; | |
1130 | } | |
1131 | } else { | |
1132 | pn->ifindex = 0; | |
1133 | release_sock(sk); | |
1134 | gprs_detach(sk); | |
1135 | err = 0; | |
1136 | } | |
1137 | goto out_norel; | |
03789f26 RDC |
1138 | |
1139 | #ifdef CONFIG_PHONET_PIPECTRLR | |
1140 | case PNPIPE_ENABLE: | |
1141 | if (pn->pipe_state <= PIPE_IDLE) { | |
1142 | err = -ENOTCONN; | |
1143 | break; | |
1144 | } | |
1145 | err = pipe_handler_enable_pipe(sk, val); | |
1146 | break; | |
1147 | #endif | |
1148 | ||
02a47617 RDC |
1149 | default: |
1150 | err = -ENOPROTOOPT; | |
1151 | } | |
1152 | release_sock(sk); | |
1153 | ||
1154 | out_norel: | |
1155 | return err; | |
1156 | } | |
1157 | ||
1158 | static int pep_getsockopt(struct sock *sk, int level, int optname, | |
1159 | char __user *optval, int __user *optlen) | |
1160 | { | |
1161 | struct pep_sock *pn = pep_sk(sk); | |
1162 | int len, val; | |
1163 | ||
1164 | if (level != SOL_PNPIPE) | |
1165 | return -ENOPROTOOPT; | |
1166 | if (get_user(len, optlen)) | |
1167 | return -EFAULT; | |
1168 | ||
1169 | switch (optname) { | |
1170 | case PNPIPE_ENCAP: | |
1171 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; | |
1172 | break; | |
8d98efa8 | 1173 | |
03789f26 RDC |
1174 | case PNPIPE_IFINDEX: |
1175 | val = pn->ifindex; | |
1176 | break; | |
1177 | ||
8d98efa8 | 1178 | #ifdef CONFIG_PHONET_PIPECTRLR |
03789f26 RDC |
1179 | case PNPIPE_ENABLE: |
1180 | if (pn->pipe_state <= PIPE_IDLE) | |
1181 | return -ENOTCONN; | |
1182 | val = pn->pipe_state != PIPE_DISABLED; | |
8d98efa8 KS |
1183 | break; |
1184 | #endif | |
1185 | ||
02a47617 RDC |
1186 | default: |
1187 | return -ENOPROTOOPT; | |
1188 | } | |
1189 | ||
1190 | len = min_t(unsigned int, sizeof(int), len); | |
1191 | if (put_user(len, optlen)) | |
1192 | return -EFAULT; | |
1193 | if (put_user(val, (int __user *) optval)) | |
1194 | return -EFAULT; | |
1195 | return 0; | |
1196 | } | |
1197 | ||
1198 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) | |
1199 | { | |
1200 | struct pep_sock *pn = pep_sk(sk); | |
1201 | struct pnpipehdr *ph; | |
e1a5964f | 1202 | int err; |
02a47617 | 1203 | |
be677730 RDC |
1204 | if (pn_flow_safe(pn->tx_fc) && |
1205 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { | |
1206 | kfree_skb(skb); | |
1207 | return -ENOBUFS; | |
1208 | } | |
1209 | ||
fea93ece | 1210 | skb_push(skb, 3 + pn->aligned); |
02a47617 RDC |
1211 | skb_reset_transport_header(skb); |
1212 | ph = pnp_hdr(skb); | |
1213 | ph->utid = 0; | |
fea93ece RDC |
1214 | if (pn->aligned) { |
1215 | ph->message_id = PNS_PIPE_ALIGNED_DATA; | |
1216 | ph->data[0] = 0; /* padding */ | |
1217 | } else | |
1218 | ph->message_id = PNS_PIPE_DATA; | |
02a47617 | 1219 | ph->pipe_handle = pn->pipe_handle; |
14ba8fae | 1220 | err = pn_skb_send(sk, skb, NULL); |
e1a5964f RDC |
1221 | |
1222 | if (err && pn_flow_safe(pn->tx_fc)) | |
1223 | atomic_inc(&pn->tx_credits); | |
1224 | return err; | |
1225 | ||
02a47617 RDC |
1226 | } |
1227 | ||
9641458d RDC |
1228 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
1229 | struct msghdr *msg, size_t len) | |
1230 | { | |
1231 | struct pep_sock *pn = pep_sk(sk); | |
b1704374 | 1232 | struct sk_buff *skb; |
9641458d RDC |
1233 | long timeo; |
1234 | int flags = msg->msg_flags; | |
1235 | int err, done; | |
1236 | ||
82ecbcb9 RDC |
1237 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
1238 | MSG_CMSG_COMPAT)) || | |
1239 | !(msg->msg_flags & MSG_EOR)) | |
9641458d RDC |
1240 | return -EOPNOTSUPP; |
1241 | ||
b1704374 RDC |
1242 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
1243 | flags & MSG_DONTWAIT, &err); | |
1244 | if (!skb) | |
02ac3268 | 1245 | return err; |
b1704374 RDC |
1246 | |
1247 | skb_reserve(skb, MAX_PHONET_HEADER + 3); | |
1248 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1249 | if (err < 0) | |
1250 | goto outfree; | |
1251 | ||
9641458d RDC |
1252 | lock_sock(sk); |
1253 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1254 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { | |
1255 | err = -ENOTCONN; | |
1256 | goto out; | |
1257 | } | |
1258 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1259 | /* Wait until the pipe gets to enabled state */ | |
1260 | disabled: | |
1261 | err = sk_stream_wait_connect(sk, &timeo); | |
1262 | if (err) | |
1263 | goto out; | |
1264 | ||
1265 | if (sk->sk_state == TCP_CLOSE_WAIT) { | |
1266 | err = -ECONNRESET; | |
1267 | goto out; | |
1268 | } | |
1269 | } | |
1270 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
1271 | ||
1272 | /* Wait until flow control allows TX */ | |
be677730 | 1273 | done = atomic_read(&pn->tx_credits); |
9641458d RDC |
1274 | while (!done) { |
1275 | DEFINE_WAIT(wait); | |
1276 | ||
1277 | if (!timeo) { | |
1278 | err = -EAGAIN; | |
1279 | goto out; | |
1280 | } | |
1281 | if (signal_pending(current)) { | |
1282 | err = sock_intr_errno(timeo); | |
1283 | goto out; | |
1284 | } | |
1285 | ||
43815482 | 1286 | prepare_to_wait(sk_sleep(sk), &wait, |
9641458d | 1287 | TASK_INTERRUPTIBLE); |
be677730 | 1288 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
43815482 | 1289 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
1290 | |
1291 | if (sk->sk_state != TCP_ESTABLISHED) | |
1292 | goto disabled; | |
1293 | } | |
1294 | ||
02a47617 | 1295 | err = pipe_skb_send(sk, skb); |
9641458d RDC |
1296 | if (err >= 0) |
1297 | err = len; /* success! */ | |
1298 | skb = NULL; | |
1299 | out: | |
1300 | release_sock(sk); | |
b1704374 | 1301 | outfree: |
9641458d RDC |
1302 | kfree_skb(skb); |
1303 | return err; | |
1304 | } | |
1305 | ||
02a47617 RDC |
1306 | int pep_writeable(struct sock *sk) |
1307 | { | |
1308 | struct pep_sock *pn = pep_sk(sk); | |
1309 | ||
be677730 | 1310 | return atomic_read(&pn->tx_credits); |
02a47617 RDC |
1311 | } |
1312 | ||
1313 | int pep_write(struct sock *sk, struct sk_buff *skb) | |
1314 | { | |
1315 | struct sk_buff *rskb, *fs; | |
1316 | int flen = 0; | |
1317 | ||
fea93ece RDC |
1318 | if (pep_sk(sk)->aligned) |
1319 | return pipe_skb_send(sk, skb); | |
1320 | ||
02a47617 RDC |
1321 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
1322 | if (!rskb) { | |
1323 | kfree_skb(skb); | |
1324 | return -ENOMEM; | |
1325 | } | |
1326 | skb_shinfo(rskb)->frag_list = skb; | |
1327 | rskb->len += skb->len; | |
1328 | rskb->data_len += rskb->len; | |
1329 | rskb->truesize += rskb->len; | |
1330 | ||
1331 | /* Avoid nested fragments */ | |
5c313e9a | 1332 | skb_walk_frags(skb, fs) |
02a47617 RDC |
1333 | flen += fs->len; |
1334 | skb->next = skb_shinfo(skb)->frag_list; | |
5c313e9a | 1335 | skb_frag_list_init(skb); |
02a47617 RDC |
1336 | skb->len -= flen; |
1337 | skb->data_len -= flen; | |
1338 | skb->truesize -= flen; | |
1339 | ||
1340 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); | |
1341 | return pipe_skb_send(sk, rskb); | |
1342 | } | |
1343 | ||
1344 | struct sk_buff *pep_read(struct sock *sk) | |
1345 | { | |
1346 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); | |
1347 | ||
1348 | if (sk->sk_state == TCP_ESTABLISHED) | |
1349 | pipe_grant_credits(sk); | |
1350 | return skb; | |
1351 | } | |
1352 | ||
9641458d RDC |
1353 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
1354 | struct msghdr *msg, size_t len, int noblock, | |
1355 | int flags, int *addr_len) | |
1356 | { | |
1357 | struct sk_buff *skb; | |
1358 | int err; | |
1359 | ||
82ecbcb9 RDC |
1360 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
1361 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) | |
1362 | return -EOPNOTSUPP; | |
1363 | ||
9641458d RDC |
1364 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
1365 | return -ENOTCONN; | |
1366 | ||
c41bd97f RDC |
1367 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
1368 | /* Dequeue and acknowledge control request */ | |
1369 | struct pep_sock *pn = pep_sk(sk); | |
1370 | ||
82ecbcb9 RDC |
1371 | if (flags & MSG_PEEK) |
1372 | return -EOPNOTSUPP; | |
c41bd97f RDC |
1373 | skb = skb_dequeue(&pn->ctrlreq_queue); |
1374 | if (skb) { | |
1375 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, | |
1376 | GFP_KERNEL); | |
1377 | msg->msg_flags |= MSG_OOB; | |
1378 | goto copy; | |
1379 | } | |
1380 | if (flags & MSG_OOB) | |
1381 | return -EINVAL; | |
1382 | } | |
1383 | ||
9641458d RDC |
1384 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1385 | lock_sock(sk); | |
1386 | if (skb == NULL) { | |
1387 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) | |
1388 | err = -ECONNRESET; | |
1389 | release_sock(sk); | |
1390 | return err; | |
1391 | } | |
1392 | ||
1393 | if (sk->sk_state == TCP_ESTABLISHED) | |
1394 | pipe_grant_credits(sk); | |
1395 | release_sock(sk); | |
c41bd97f | 1396 | copy: |
9641458d | 1397 | msg->msg_flags |= MSG_EOR; |
9641458d RDC |
1398 | if (skb->len > len) |
1399 | msg->msg_flags |= MSG_TRUNC; | |
1400 | else | |
1401 | len = skb->len; | |
1402 | ||
1403 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
1404 | if (!err) | |
1405 | err = (flags & MSG_TRUNC) ? skb->len : len; | |
1406 | ||
1407 | skb_free_datagram(sk, skb); | |
1408 | return err; | |
1409 | } | |
1410 | ||
1411 | static void pep_sock_unhash(struct sock *sk) | |
1412 | { | |
1413 | struct pep_sock *pn = pep_sk(sk); | |
1414 | struct sock *skparent = NULL; | |
1415 | ||
1416 | lock_sock(sk); | |
b3d62553 KS |
1417 | |
1418 | #ifndef CONFIG_PHONET_PIPECTRLR | |
9641458d RDC |
1419 | if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) { |
1420 | skparent = pn->listener; | |
9641458d RDC |
1421 | release_sock(sk); |
1422 | ||
9641458d | 1423 | pn = pep_sk(skparent); |
7dfde179 RDC |
1424 | lock_sock(skparent); |
1425 | sk_del_node_init(sk); | |
1426 | sk = skparent; | |
9641458d | 1427 | } |
b3d62553 | 1428 | #endif |
9641458d RDC |
1429 | /* Unhash a listening sock only when it is closed |
1430 | * and all of its active connected pipes are closed. */ | |
1431 | if (hlist_empty(&pn->hlist)) | |
1432 | pn_sock_unhash(&pn->pn_sk.sk); | |
1433 | release_sock(sk); | |
1434 | ||
1435 | if (skparent) | |
1436 | sock_put(skparent); | |
1437 | } | |
1438 | ||
1439 | static struct proto pep_proto = { | |
1440 | .close = pep_sock_close, | |
1441 | .accept = pep_sock_accept, | |
b3d62553 KS |
1442 | #ifdef CONFIG_PHONET_PIPECTRLR |
1443 | .connect = pep_sock_connect, | |
1444 | #endif | |
9641458d RDC |
1445 | .ioctl = pep_ioctl, |
1446 | .init = pep_init, | |
02a47617 RDC |
1447 | .setsockopt = pep_setsockopt, |
1448 | .getsockopt = pep_getsockopt, | |
9641458d RDC |
1449 | .sendmsg = pep_sendmsg, |
1450 | .recvmsg = pep_recvmsg, | |
1451 | .backlog_rcv = pep_do_rcv, | |
1452 | .hash = pn_sock_hash, | |
1453 | .unhash = pep_sock_unhash, | |
1454 | .get_port = pn_sock_get_port, | |
1455 | .obj_size = sizeof(struct pep_sock), | |
1456 | .owner = THIS_MODULE, | |
1457 | .name = "PNPIPE", | |
1458 | }; | |
1459 | ||
1460 | static struct phonet_protocol pep_pn_proto = { | |
1461 | .ops = &phonet_stream_ops, | |
1462 | .prot = &pep_proto, | |
1463 | .sock_type = SOCK_SEQPACKET, | |
1464 | }; | |
1465 | ||
1466 | static int __init pep_register(void) | |
1467 | { | |
1468 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); | |
1469 | } | |
1470 | ||
1471 | static void __exit pep_unregister(void) | |
1472 | { | |
1473 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); | |
1474 | } | |
1475 | ||
1476 | module_init(pep_register); | |
1477 | module_exit(pep_unregister); | |
1478 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); | |
1479 | MODULE_DESCRIPTION("Phonet pipe protocol"); | |
1480 | MODULE_LICENSE("GPL"); | |
1481 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |