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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; | |
91 | ||
92 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
93 | if (!skb) | |
94 | return -ENOMEM; | |
95 | skb_set_owner_w(skb, sk); | |
96 | ||
97 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
98 | __skb_put(skb, len); | |
99 | skb_copy_to_linear_data(skb, data, len); | |
100 | __skb_push(skb, sizeof(*ph)); | |
101 | skb_reset_transport_header(skb); | |
102 | ph = pnp_hdr(skb); | |
103 | ph->utid = oph->utid; | |
104 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ | |
105 | ph->pipe_handle = oph->pipe_handle; | |
106 | ph->error_code = code; | |
107 | ||
108 | return pn_skb_send(sk, skb, &pipe_srv); | |
109 | } | |
110 | ||
111 | #define PAD 0x00 | |
8d98efa8 KS |
112 | |
113 | #ifdef CONFIG_PHONET_PIPECTRLR | |
114 | static u8 pipe_negotiate_fc(u8 *host_fc, u8 *remote_fc, int len) | |
115 | { | |
116 | int i, j; | |
117 | u8 base_fc, final_fc; | |
118 | ||
119 | for (i = 0; i < len; i++) { | |
120 | base_fc = host_fc[i]; | |
121 | for (j = 0; j < len; j++) { | |
122 | if (remote_fc[j] == base_fc) { | |
123 | final_fc = base_fc; | |
124 | goto done; | |
125 | } | |
126 | } | |
127 | } | |
128 | return -EINVAL; | |
129 | ||
130 | done: | |
131 | return final_fc; | |
132 | ||
133 | } | |
134 | ||
135 | static int pipe_get_flow_info(struct sock *sk, struct sk_buff *skb, | |
136 | u8 *pref_rx_fc, u8 *req_tx_fc) | |
137 | { | |
138 | struct pnpipehdr *hdr; | |
139 | u8 n_sb; | |
140 | ||
141 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
142 | return -EINVAL; | |
143 | ||
144 | hdr = pnp_hdr(skb); | |
145 | n_sb = hdr->data[4]; | |
146 | ||
147 | __skb_pull(skb, sizeof(*hdr) + 4); | |
148 | while (n_sb > 0) { | |
149 | u8 type, buf[3], len = sizeof(buf); | |
150 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
151 | ||
152 | if (data == NULL) | |
153 | return -EINVAL; | |
154 | ||
155 | switch (type) { | |
156 | case PN_PIPE_SB_REQUIRED_FC_TX: | |
157 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
158 | break; | |
159 | req_tx_fc[0] = data[2]; | |
160 | req_tx_fc[1] = data[3]; | |
161 | req_tx_fc[2] = data[4]; | |
162 | break; | |
163 | ||
164 | case PN_PIPE_SB_PREFERRED_FC_RX: | |
165 | if (len < 3 || (data[2] | data[3] | data[4]) > 3) | |
166 | break; | |
167 | pref_rx_fc[0] = data[2]; | |
168 | pref_rx_fc[1] = data[3]; | |
169 | pref_rx_fc[2] = data[4]; | |
170 | break; | |
171 | ||
172 | } | |
173 | n_sb--; | |
174 | } | |
175 | return 0; | |
176 | } | |
177 | ||
b3d62553 KS |
178 | static int pipe_handler_send_req(struct sock *sk, u8 utid, |
179 | u8 msg_id, gfp_t priority) | |
8d98efa8 KS |
180 | { |
181 | int len; | |
182 | struct pnpipehdr *ph; | |
183 | struct sk_buff *skb; | |
b3d62553 | 184 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
185 | |
186 | static const u8 data[4] = { | |
187 | PAD, PAD, PAD, PAD, | |
188 | }; | |
189 | ||
190 | switch (msg_id) { | |
191 | case PNS_PEP_CONNECT_REQ: | |
192 | len = sizeof(data); | |
193 | break; | |
194 | ||
195 | case PNS_PEP_DISCONNECT_REQ: | |
196 | case PNS_PEP_ENABLE_REQ: | |
197 | case PNS_PEP_DISABLE_REQ: | |
198 | len = 0; | |
199 | break; | |
200 | ||
201 | default: | |
202 | return -EINVAL; | |
203 | } | |
204 | ||
205 | skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
206 | if (!skb) | |
207 | return -ENOMEM; | |
208 | skb_set_owner_w(skb, sk); | |
209 | ||
210 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
211 | if (len) { | |
212 | __skb_put(skb, len); | |
213 | skb_copy_to_linear_data(skb, data, len); | |
214 | } | |
215 | __skb_push(skb, sizeof(*ph)); | |
216 | skb_reset_transport_header(skb); | |
217 | ph = pnp_hdr(skb); | |
218 | ph->utid = utid; | |
219 | ph->message_id = msg_id; | |
b3d62553 | 220 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
221 | ph->error_code = PN_PIPE_NO_ERROR; |
222 | ||
b3d62553 | 223 | return pn_skb_send(sk, skb, &pn->remote_pep); |
8d98efa8 KS |
224 | } |
225 | ||
b3d62553 KS |
226 | static int pipe_handler_send_created_ind(struct sock *sk, |
227 | u8 utid, u8 msg_id) | |
8d98efa8 KS |
228 | { |
229 | int err_code; | |
230 | struct pnpipehdr *ph; | |
231 | struct sk_buff *skb; | |
8d98efa8 | 232 | |
b3d62553 | 233 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
234 | static u8 data[4] = { |
235 | 0x03, 0x04, | |
236 | }; | |
b3d62553 KS |
237 | data[2] = pn->tx_fc; |
238 | data[3] = pn->rx_fc; | |
8d98efa8 KS |
239 | |
240 | /* | |
241 | * actually, below is number of sub-blocks and not error code. | |
242 | * Pipe_created_ind message format does not have any | |
243 | * error code field. However, the Phonet stack will always send | |
244 | * an error code as part of pnpipehdr. So, use that err_code to | |
245 | * specify the number of sub-blocks. | |
246 | */ | |
247 | err_code = 0x01; | |
248 | ||
249 | skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC); | |
250 | if (!skb) | |
251 | return -ENOMEM; | |
252 | skb_set_owner_w(skb, sk); | |
253 | ||
254 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
255 | __skb_put(skb, sizeof(data)); | |
256 | skb_copy_to_linear_data(skb, data, sizeof(data)); | |
257 | __skb_push(skb, sizeof(*ph)); | |
258 | skb_reset_transport_header(skb); | |
259 | ph = pnp_hdr(skb); | |
260 | ph->utid = utid; | |
261 | ph->message_id = msg_id; | |
b3d62553 | 262 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
263 | ph->error_code = err_code; |
264 | ||
b3d62553 | 265 | return pn_skb_send(sk, skb, &pn->remote_pep); |
8d98efa8 KS |
266 | } |
267 | ||
b3d62553 | 268 | static int pipe_handler_send_ind(struct sock *sk, u8 utid, u8 msg_id) |
8d98efa8 KS |
269 | { |
270 | int err_code; | |
271 | struct pnpipehdr *ph; | |
272 | struct sk_buff *skb; | |
b3d62553 | 273 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
274 | |
275 | /* | |
276 | * actually, below is a filler. | |
277 | * Pipe_enabled/disabled_ind message format does not have any | |
278 | * error code field. However, the Phonet stack will always send | |
279 | * an error code as part of pnpipehdr. So, use that err_code to | |
280 | * specify the filler value. | |
281 | */ | |
282 | err_code = 0x0; | |
283 | ||
284 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); | |
285 | if (!skb) | |
286 | return -ENOMEM; | |
287 | skb_set_owner_w(skb, sk); | |
288 | ||
289 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
290 | __skb_push(skb, sizeof(*ph)); | |
291 | skb_reset_transport_header(skb); | |
292 | ph = pnp_hdr(skb); | |
293 | ph->utid = utid; | |
294 | ph->message_id = msg_id; | |
b3d62553 | 295 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 KS |
296 | ph->error_code = err_code; |
297 | ||
b3d62553 | 298 | return pn_skb_send(sk, skb, &pn->remote_pep); |
8d98efa8 KS |
299 | } |
300 | ||
03789f26 | 301 | static int pipe_handler_enable_pipe(struct sock *sk, int enable) |
8d98efa8 | 302 | { |
03789f26 RDC |
303 | int utid, req; |
304 | ||
305 | if (enable) { | |
306 | utid = PNS_PIPE_ENABLE_UTID; | |
307 | req = PNS_PEP_ENABLE_REQ; | |
308 | } else { | |
309 | utid = PNS_PIPE_DISABLE_UTID; | |
310 | req = PNS_PEP_DISABLE_REQ; | |
8d98efa8 | 311 | } |
b3d62553 | 312 | return pipe_handler_send_req(sk, utid, req, GFP_ATOMIC); |
8d98efa8 KS |
313 | } |
314 | #endif | |
315 | ||
9641458d RDC |
316 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
317 | { | |
318 | static const u8 data[20] = { | |
319 | PAD, PAD, PAD, 2 /* sub-blocks */, | |
320 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, | |
321 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
322 | PN_ONE_CREDIT_FLOW_CONTROL, | |
323 | PN_LEGACY_FLOW_CONTROL, | |
324 | PAD, | |
325 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, | |
326 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
327 | PN_ONE_CREDIT_FLOW_CONTROL, | |
328 | PN_LEGACY_FLOW_CONTROL, | |
329 | PAD, | |
330 | }; | |
331 | ||
332 | might_sleep(); | |
333 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), | |
334 | GFP_KERNEL); | |
335 | } | |
336 | ||
337 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code) | |
338 | { | |
339 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; | |
340 | WARN_ON(code == PN_PIPE_NO_ERROR); | |
341 | return pep_reply(sk, skb, code, data, sizeof(data), GFP_ATOMIC); | |
342 | } | |
343 | ||
344 | /* Control requests are not sent by the pipe service and have a specific | |
345 | * message format. */ | |
c41bd97f RDC |
346 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
347 | gfp_t priority) | |
9641458d RDC |
348 | { |
349 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
350 | struct sk_buff *skb; | |
351 | struct pnpipehdr *ph; | |
352 | struct sockaddr_pn dst; | |
353 | ||
c41bd97f | 354 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); |
9641458d RDC |
355 | if (!skb) |
356 | return -ENOMEM; | |
357 | skb_set_owner_w(skb, sk); | |
358 | ||
359 | skb_reserve(skb, MAX_PHONET_HEADER); | |
360 | ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4); | |
361 | ||
362 | ph->utid = oph->utid; | |
363 | ph->message_id = PNS_PEP_CTRL_RESP; | |
364 | ph->pipe_handle = oph->pipe_handle; | |
365 | ph->data[0] = oph->data[1]; /* CTRL id */ | |
366 | ph->data[1] = oph->data[0]; /* PEP type */ | |
367 | ph->data[2] = code; /* error code, at an usual offset */ | |
368 | ph->data[3] = PAD; | |
369 | ph->data[4] = PAD; | |
370 | ||
371 | pn_skb_get_src_sockaddr(oskb, &dst); | |
372 | return pn_skb_send(sk, skb, &dst); | |
373 | } | |
374 | ||
375 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) | |
376 | { | |
377 | struct pep_sock *pn = pep_sk(sk); | |
378 | struct pnpipehdr *ph; | |
379 | struct sk_buff *skb; | |
380 | ||
381 | skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority); | |
382 | if (!skb) | |
383 | return -ENOMEM; | |
384 | skb_set_owner_w(skb, sk); | |
385 | ||
386 | skb_reserve(skb, MAX_PNPIPE_HEADER + 4); | |
387 | __skb_push(skb, sizeof(*ph) + 4); | |
388 | skb_reset_transport_header(skb); | |
389 | ph = pnp_hdr(skb); | |
390 | ph->utid = 0; | |
391 | ph->message_id = PNS_PEP_STATUS_IND; | |
392 | ph->pipe_handle = pn->pipe_handle; | |
393 | ph->pep_type = PN_PEP_TYPE_COMMON; | |
394 | ph->data[1] = type; | |
395 | ph->data[2] = PAD; | |
396 | ph->data[3] = PAD; | |
397 | ph->data[4] = status; | |
398 | ||
8d98efa8 | 399 | #ifdef CONFIG_PHONET_PIPECTRLR |
b3d62553 | 400 | return pn_skb_send(sk, skb, &pn->remote_pep); |
8d98efa8 | 401 | #else |
9641458d | 402 | return pn_skb_send(sk, skb, &pipe_srv); |
8d98efa8 | 403 | #endif |
9641458d RDC |
404 | } |
405 | ||
406 | /* Send our RX flow control information to the sender. | |
407 | * Socket must be locked. */ | |
408 | static void pipe_grant_credits(struct sock *sk) | |
409 | { | |
410 | struct pep_sock *pn = pep_sk(sk); | |
411 | ||
412 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
413 | ||
414 | switch (pn->rx_fc) { | |
415 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ | |
416 | break; | |
417 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
418 | pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, | |
419 | PEP_IND_READY, GFP_ATOMIC); | |
420 | pn->rx_credits = 1; | |
421 | break; | |
422 | case PN_MULTI_CREDIT_FLOW_CONTROL: | |
423 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) | |
424 | break; | |
425 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, | |
426 | CREDITS_MAX - pn->rx_credits, | |
427 | GFP_ATOMIC) == 0) | |
428 | pn->rx_credits = CREDITS_MAX; | |
429 | break; | |
430 | } | |
431 | } | |
432 | ||
433 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) | |
434 | { | |
435 | struct pep_sock *pn = pep_sk(sk); | |
a91e7d47 | 436 | struct pnpipehdr *hdr; |
be677730 | 437 | int wake = 0; |
9641458d RDC |
438 | |
439 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
440 | return -EINVAL; | |
441 | ||
a91e7d47 | 442 | hdr = pnp_hdr(skb); |
9641458d RDC |
443 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
444 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", | |
445 | (unsigned)hdr->data[0]); | |
446 | return -EOPNOTSUPP; | |
447 | } | |
448 | ||
449 | switch (hdr->data[1]) { | |
450 | case PN_PEP_IND_FLOW_CONTROL: | |
451 | switch (pn->tx_fc) { | |
452 | case PN_LEGACY_FLOW_CONTROL: | |
453 | switch (hdr->data[4]) { | |
454 | case PEP_IND_BUSY: | |
be677730 | 455 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
456 | break; |
457 | case PEP_IND_READY: | |
be677730 | 458 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
459 | break; |
460 | } | |
461 | break; | |
462 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
463 | if (hdr->data[4] == PEP_IND_READY) | |
be677730 | 464 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
465 | break; |
466 | } | |
467 | break; | |
468 | ||
469 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: | |
470 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) | |
471 | break; | |
be677730 | 472 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
9641458d RDC |
473 | break; |
474 | ||
475 | default: | |
476 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", | |
477 | (unsigned)hdr->data[1]); | |
478 | return -EOPNOTSUPP; | |
479 | } | |
be677730 | 480 | if (wake) |
9641458d RDC |
481 | sk->sk_write_space(sk); |
482 | return 0; | |
483 | } | |
484 | ||
485 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) | |
486 | { | |
487 | struct pep_sock *pn = pep_sk(sk); | |
488 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
489 | u8 n_sb = hdr->data[0]; | |
490 | ||
491 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
492 | __skb_pull(skb, sizeof(*hdr)); | |
493 | while (n_sb > 0) { | |
494 | u8 type, buf[2], len = sizeof(buf); | |
495 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
496 | ||
497 | if (data == NULL) | |
498 | return -EINVAL; | |
499 | switch (type) { | |
500 | case PN_PIPE_SB_NEGOTIATED_FC: | |
501 | if (len < 2 || (data[0] | data[1]) > 3) | |
502 | break; | |
503 | pn->tx_fc = data[0] & 3; | |
504 | pn->rx_fc = data[1] & 3; | |
505 | break; | |
506 | } | |
507 | n_sb--; | |
508 | } | |
509 | return 0; | |
510 | } | |
511 | ||
512 | /* Queue an skb to a connected sock. | |
513 | * Socket lock must be held. */ | |
514 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) | |
515 | { | |
516 | struct pep_sock *pn = pep_sk(sk); | |
517 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
c41bd97f | 518 | struct sk_buff_head *queue; |
9641458d RDC |
519 | int err = 0; |
520 | ||
521 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); | |
522 | ||
523 | switch (hdr->message_id) { | |
524 | case PNS_PEP_CONNECT_REQ: | |
525 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
526 | break; | |
527 | ||
528 | case PNS_PEP_DISCONNECT_REQ: | |
529 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
530 | sk->sk_state = TCP_CLOSE_WAIT; | |
531 | if (!sock_flag(sk, SOCK_DEAD)) | |
532 | sk->sk_state_change(sk); | |
533 | break; | |
534 | ||
8d98efa8 KS |
535 | #ifdef CONFIG_PHONET_PIPECTRLR |
536 | case PNS_PEP_DISCONNECT_RESP: | |
537 | pn->pipe_state = PIPE_IDLE; | |
b3d62553 | 538 | sk->sk_state = TCP_CLOSE; |
8d98efa8 KS |
539 | break; |
540 | #endif | |
541 | ||
9641458d RDC |
542 | case PNS_PEP_ENABLE_REQ: |
543 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ | |
544 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
545 | break; | |
546 | ||
8d98efa8 KS |
547 | #ifdef CONFIG_PHONET_PIPECTRLR |
548 | case PNS_PEP_ENABLE_RESP: | |
b3d62553 KS |
549 | pn->pipe_state = PIPE_ENABLED; |
550 | pipe_handler_send_ind(sk, PNS_PIPE_ENABLED_IND_UTID, | |
551 | PNS_PIPE_ENABLED_IND); | |
8d98efa8 | 552 | |
b3d62553 KS |
553 | if (!pn_flow_safe(pn->tx_fc)) { |
554 | atomic_set(&pn->tx_credits, 1); | |
555 | sk->sk_write_space(sk); | |
556 | } | |
557 | if (sk->sk_state == TCP_ESTABLISHED) | |
558 | break; /* Nothing to do */ | |
559 | sk->sk_state = TCP_ESTABLISHED; | |
560 | pipe_grant_credits(sk); | |
8d98efa8 KS |
561 | break; |
562 | #endif | |
563 | ||
9641458d RDC |
564 | case PNS_PEP_RESET_REQ: |
565 | switch (hdr->state_after_reset) { | |
566 | case PN_PIPE_DISABLE: | |
567 | pn->init_enable = 0; | |
568 | break; | |
569 | case PN_PIPE_ENABLE: | |
570 | pn->init_enable = 1; | |
571 | break; | |
572 | default: /* not allowed to send an error here!? */ | |
573 | err = -EINVAL; | |
574 | goto out; | |
575 | } | |
576 | /* fall through */ | |
577 | case PNS_PEP_DISABLE_REQ: | |
be677730 | 578 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
579 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
580 | break; | |
581 | ||
8d98efa8 KS |
582 | #ifdef CONFIG_PHONET_PIPECTRLR |
583 | case PNS_PEP_DISABLE_RESP: | |
b3d62553 KS |
584 | pn->pipe_state = PIPE_DISABLED; |
585 | atomic_set(&pn->tx_credits, 0); | |
586 | pipe_handler_send_ind(sk, PNS_PIPE_DISABLED_IND_UTID, | |
587 | PNS_PIPE_DISABLED_IND); | |
588 | sk->sk_state = TCP_SYN_RECV; | |
589 | pn->rx_credits = 0; | |
8d98efa8 KS |
590 | break; |
591 | #endif | |
592 | ||
9641458d | 593 | case PNS_PEP_CTRL_REQ: |
2e2fb4b3 RDC |
594 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
595 | atomic_inc(&sk->sk_drops); | |
c41bd97f | 596 | break; |
2e2fb4b3 | 597 | } |
c41bd97f RDC |
598 | __skb_pull(skb, 4); |
599 | queue = &pn->ctrlreq_queue; | |
600 | goto queue; | |
9641458d | 601 | |
fc6a1107 RDC |
602 | case PNS_PIPE_ALIGNED_DATA: |
603 | __skb_pull(skb, 1); | |
604 | /* fall through */ | |
9641458d RDC |
605 | case PNS_PIPE_DATA: |
606 | __skb_pull(skb, 3); /* Pipe data header */ | |
607 | if (!pn_flow_safe(pn->rx_fc)) { | |
608 | err = sock_queue_rcv_skb(sk, skb); | |
609 | if (!err) | |
610 | return 0; | |
611 | break; | |
612 | } | |
613 | ||
614 | if (pn->rx_credits == 0) { | |
2e2fb4b3 | 615 | atomic_inc(&sk->sk_drops); |
9641458d RDC |
616 | err = -ENOBUFS; |
617 | break; | |
618 | } | |
619 | pn->rx_credits--; | |
c41bd97f RDC |
620 | queue = &sk->sk_receive_queue; |
621 | goto queue; | |
9641458d RDC |
622 | |
623 | case PNS_PEP_STATUS_IND: | |
624 | pipe_rcv_status(sk, skb); | |
625 | break; | |
626 | ||
627 | case PNS_PIPE_REDIRECTED_IND: | |
628 | err = pipe_rcv_created(sk, skb); | |
629 | break; | |
630 | ||
631 | case PNS_PIPE_CREATED_IND: | |
632 | err = pipe_rcv_created(sk, skb); | |
633 | if (err) | |
634 | break; | |
635 | /* fall through */ | |
636 | case PNS_PIPE_RESET_IND: | |
637 | if (!pn->init_enable) | |
638 | break; | |
639 | /* fall through */ | |
640 | case PNS_PIPE_ENABLED_IND: | |
641 | if (!pn_flow_safe(pn->tx_fc)) { | |
be677730 | 642 | atomic_set(&pn->tx_credits, 1); |
9641458d RDC |
643 | sk->sk_write_space(sk); |
644 | } | |
645 | if (sk->sk_state == TCP_ESTABLISHED) | |
646 | break; /* Nothing to do */ | |
647 | sk->sk_state = TCP_ESTABLISHED; | |
648 | pipe_grant_credits(sk); | |
649 | break; | |
650 | ||
651 | case PNS_PIPE_DISABLED_IND: | |
652 | sk->sk_state = TCP_SYN_RECV; | |
653 | pn->rx_credits = 0; | |
654 | break; | |
655 | ||
656 | default: | |
657 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", | |
658 | hdr->message_id); | |
659 | err = -EINVAL; | |
660 | } | |
661 | out: | |
662 | kfree_skb(skb); | |
663 | return err; | |
c41bd97f RDC |
664 | |
665 | queue: | |
666 | skb->dev = NULL; | |
667 | skb_set_owner_r(skb, sk); | |
668 | err = skb->len; | |
669 | skb_queue_tail(queue, skb); | |
670 | if (!sock_flag(sk, SOCK_DEAD)) | |
671 | sk->sk_data_ready(sk, err); | |
672 | return 0; | |
9641458d RDC |
673 | } |
674 | ||
675 | /* Destroy connected sock. */ | |
676 | static void pipe_destruct(struct sock *sk) | |
677 | { | |
c41bd97f RDC |
678 | struct pep_sock *pn = pep_sk(sk); |
679 | ||
9641458d | 680 | skb_queue_purge(&sk->sk_receive_queue); |
c41bd97f | 681 | skb_queue_purge(&pn->ctrlreq_queue); |
9641458d RDC |
682 | } |
683 | ||
b3d62553 KS |
684 | #ifdef CONFIG_PHONET_PIPECTRLR |
685 | static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb) | |
686 | { | |
687 | struct pep_sock *pn = pep_sk(sk); | |
688 | u8 host_pref_rx_fc[3] = {3, 2, 1}, host_req_tx_fc[3] = {3, 2, 1}; | |
689 | u8 remote_pref_rx_fc[3], remote_req_tx_fc[3]; | |
690 | u8 negotiated_rx_fc, negotiated_tx_fc; | |
691 | int ret; | |
692 | ||
693 | pipe_get_flow_info(sk, skb, remote_pref_rx_fc, | |
694 | remote_req_tx_fc); | |
695 | negotiated_tx_fc = pipe_negotiate_fc(remote_req_tx_fc, | |
696 | host_pref_rx_fc, | |
697 | sizeof(host_pref_rx_fc)); | |
698 | negotiated_rx_fc = pipe_negotiate_fc(host_req_tx_fc, | |
699 | remote_pref_rx_fc, | |
700 | sizeof(host_pref_rx_fc)); | |
701 | ||
702 | pn->pipe_state = PIPE_DISABLED; | |
703 | sk->sk_state = TCP_SYN_RECV; | |
704 | sk->sk_backlog_rcv = pipe_do_rcv; | |
705 | sk->sk_destruct = pipe_destruct; | |
706 | pn->rx_credits = 0; | |
707 | pn->rx_fc = negotiated_rx_fc; | |
708 | pn->tx_fc = negotiated_tx_fc; | |
709 | sk->sk_state_change(sk); | |
710 | ||
711 | ret = pipe_handler_send_created_ind(sk, | |
712 | PNS_PIPE_CREATED_IND_UTID, | |
713 | PNS_PIPE_CREATED_IND | |
714 | ); | |
715 | ||
716 | return ret; | |
717 | } | |
718 | #endif | |
719 | ||
9641458d RDC |
720 | static int pep_connreq_rcv(struct sock *sk, struct sk_buff *skb) |
721 | { | |
722 | struct sock *newsk; | |
723 | struct pep_sock *newpn, *pn = pep_sk(sk); | |
724 | struct pnpipehdr *hdr; | |
725 | struct sockaddr_pn dst; | |
726 | u16 peer_type; | |
727 | u8 pipe_handle, enabled, n_sb; | |
fea93ece | 728 | u8 aligned = 0; |
9641458d RDC |
729 | |
730 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) | |
731 | return -EINVAL; | |
732 | ||
733 | hdr = pnp_hdr(skb); | |
734 | pipe_handle = hdr->pipe_handle; | |
735 | switch (hdr->state_after_connect) { | |
736 | case PN_PIPE_DISABLE: | |
737 | enabled = 0; | |
738 | break; | |
739 | case PN_PIPE_ENABLE: | |
740 | enabled = 1; | |
741 | break; | |
742 | default: | |
743 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM); | |
744 | return -EINVAL; | |
745 | } | |
746 | peer_type = hdr->other_pep_type << 8; | |
747 | ||
748 | if (unlikely(sk->sk_state != TCP_LISTEN) || sk_acceptq_is_full(sk)) { | |
749 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE); | |
750 | return -ENOBUFS; | |
751 | } | |
752 | ||
753 | /* Parse sub-blocks (options) */ | |
754 | n_sb = hdr->data[4]; | |
755 | while (n_sb > 0) { | |
756 | u8 type, buf[1], len = sizeof(buf); | |
757 | const u8 *data = pep_get_sb(skb, &type, &len, buf); | |
758 | ||
759 | if (data == NULL) | |
760 | return -EINVAL; | |
761 | switch (type) { | |
762 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: | |
763 | if (len < 1) | |
764 | return -EINVAL; | |
765 | peer_type = (peer_type & 0xff00) | data[0]; | |
766 | break; | |
fea93ece RDC |
767 | case PN_PIPE_SB_ALIGNED_DATA: |
768 | aligned = data[0] != 0; | |
769 | break; | |
9641458d RDC |
770 | } |
771 | n_sb--; | |
772 | } | |
773 | ||
774 | skb = skb_clone(skb, GFP_ATOMIC); | |
775 | if (!skb) | |
776 | return -ENOMEM; | |
777 | ||
778 | /* Create a new to-be-accepted sock */ | |
779 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_ATOMIC, sk->sk_prot); | |
780 | if (!newsk) { | |
781 | kfree_skb(skb); | |
782 | return -ENOMEM; | |
783 | } | |
784 | sock_init_data(NULL, newsk); | |
785 | newsk->sk_state = TCP_SYN_RECV; | |
786 | newsk->sk_backlog_rcv = pipe_do_rcv; | |
787 | newsk->sk_protocol = sk->sk_protocol; | |
788 | newsk->sk_destruct = pipe_destruct; | |
789 | ||
790 | newpn = pep_sk(newsk); | |
791 | pn_skb_get_dst_sockaddr(skb, &dst); | |
792 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); | |
793 | newpn->pn_sk.resource = pn->pn_sk.resource; | |
c41bd97f | 794 | skb_queue_head_init(&newpn->ctrlreq_queue); |
9641458d | 795 | newpn->pipe_handle = pipe_handle; |
be677730 | 796 | atomic_set(&newpn->tx_credits, 0); |
9641458d | 797 | newpn->peer_type = peer_type; |
be677730 | 798 | newpn->rx_credits = 0; |
9641458d RDC |
799 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
800 | newpn->init_enable = enabled; | |
fea93ece | 801 | newpn->aligned = aligned; |
9641458d RDC |
802 | |
803 | BUG_ON(!skb_queue_empty(&newsk->sk_receive_queue)); | |
804 | skb_queue_head(&newsk->sk_receive_queue, skb); | |
805 | if (!sock_flag(sk, SOCK_DEAD)) | |
806 | sk->sk_data_ready(sk, 0); | |
807 | ||
808 | sk_acceptq_added(sk); | |
809 | sk_add_node(newsk, &pn->ackq); | |
810 | return 0; | |
811 | } | |
812 | ||
813 | /* Listening sock must be locked */ | |
814 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, | |
815 | const struct sockaddr_pn *dst, | |
816 | u8 pipe_handle) | |
817 | { | |
818 | struct hlist_node *node; | |
819 | struct sock *sknode; | |
820 | u16 dobj = pn_sockaddr_get_object(dst); | |
821 | ||
822 | sk_for_each(sknode, node, hlist) { | |
823 | struct pep_sock *pnnode = pep_sk(sknode); | |
824 | ||
825 | /* Ports match, but addresses might not: */ | |
826 | if (pnnode->pn_sk.sobject != dobj) | |
827 | continue; | |
828 | if (pnnode->pipe_handle != pipe_handle) | |
829 | continue; | |
830 | if (sknode->sk_state == TCP_CLOSE_WAIT) | |
831 | continue; | |
832 | ||
833 | sock_hold(sknode); | |
834 | return sknode; | |
835 | } | |
836 | return NULL; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Deliver an skb to a listening sock. | |
841 | * Socket lock must be held. | |
842 | * We then queue the skb to the right connected sock (if any). | |
843 | */ | |
844 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) | |
845 | { | |
846 | struct pep_sock *pn = pep_sk(sk); | |
847 | struct sock *sknode; | |
2ddc1ac1 | 848 | struct pnpipehdr *hdr; |
9641458d RDC |
849 | struct sockaddr_pn dst; |
850 | int err = NET_RX_SUCCESS; | |
851 | u8 pipe_handle; | |
852 | ||
853 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
854 | goto drop; | |
855 | ||
856 | hdr = pnp_hdr(skb); | |
857 | pipe_handle = hdr->pipe_handle; | |
858 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) | |
859 | goto drop; | |
860 | ||
861 | pn_skb_get_dst_sockaddr(skb, &dst); | |
862 | ||
863 | /* Look for an existing pipe handle */ | |
864 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); | |
865 | if (sknode) | |
866 | return sk_receive_skb(sknode, skb, 1); | |
867 | ||
868 | /* Look for a pipe handle pending accept */ | |
869 | sknode = pep_find_pipe(&pn->ackq, &dst, pipe_handle); | |
870 | if (sknode) { | |
871 | sock_put(sknode); | |
872 | if (net_ratelimit()) | |
873 | printk(KERN_WARNING"Phonet unconnected PEP ignored"); | |
874 | err = NET_RX_DROP; | |
875 | goto drop; | |
876 | } | |
877 | ||
878 | switch (hdr->message_id) { | |
879 | case PNS_PEP_CONNECT_REQ: | |
880 | err = pep_connreq_rcv(sk, skb); | |
881 | break; | |
882 | ||
b3d62553 KS |
883 | #ifdef CONFIG_PHONET_PIPECTRLR |
884 | case PNS_PEP_CONNECT_RESP: | |
885 | err = pep_connresp_rcv(sk, skb); | |
886 | break; | |
887 | #endif | |
888 | ||
9641458d RDC |
889 | case PNS_PEP_DISCONNECT_REQ: |
890 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
891 | break; | |
892 | ||
893 | case PNS_PEP_CTRL_REQ: | |
c41bd97f | 894 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
9641458d RDC |
895 | break; |
896 | ||
897 | case PNS_PEP_RESET_REQ: | |
898 | case PNS_PEP_ENABLE_REQ: | |
899 | case PNS_PEP_DISABLE_REQ: | |
900 | /* invalid handle is not even allowed here! */ | |
901 | default: | |
902 | err = NET_RX_DROP; | |
903 | } | |
904 | drop: | |
905 | kfree_skb(skb); | |
906 | return err; | |
907 | } | |
908 | ||
6482f554 RDC |
909 | static int pipe_do_remove(struct sock *sk) |
910 | { | |
911 | struct pep_sock *pn = pep_sk(sk); | |
912 | struct pnpipehdr *ph; | |
913 | struct sk_buff *skb; | |
914 | ||
915 | skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL); | |
916 | if (!skb) | |
917 | return -ENOMEM; | |
918 | ||
919 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
920 | __skb_push(skb, sizeof(*ph)); | |
921 | skb_reset_transport_header(skb); | |
922 | ph = pnp_hdr(skb); | |
923 | ph->utid = 0; | |
924 | ph->message_id = PNS_PIPE_REMOVE_REQ; | |
925 | ph->pipe_handle = pn->pipe_handle; | |
926 | ph->data[0] = PAD; | |
927 | ||
928 | return pn_skb_send(sk, skb, &pipe_srv); | |
929 | } | |
930 | ||
9641458d RDC |
931 | /* associated socket ceases to exist */ |
932 | static void pep_sock_close(struct sock *sk, long timeout) | |
933 | { | |
934 | struct pep_sock *pn = pep_sk(sk); | |
02a47617 | 935 | int ifindex = 0; |
9641458d | 936 | |
e513480e | 937 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
9641458d RDC |
938 | sk_common_release(sk); |
939 | ||
940 | lock_sock(sk); | |
941 | if (sk->sk_state == TCP_LISTEN) { | |
942 | /* Destroy the listen queue */ | |
943 | struct sock *sknode; | |
944 | struct hlist_node *p, *n; | |
945 | ||
946 | sk_for_each_safe(sknode, p, n, &pn->ackq) | |
947 | sk_del_node_init(sknode); | |
948 | sk->sk_state = TCP_CLOSE; | |
6482f554 RDC |
949 | } else if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) |
950 | /* Forcefully remove dangling Phonet pipe */ | |
951 | pipe_do_remove(sk); | |
952 | ||
b3d62553 KS |
953 | #ifdef CONFIG_PHONET_PIPECTRLR |
954 | if (pn->pipe_state != PIPE_IDLE) { | |
955 | /* send pep disconnect request */ | |
956 | pipe_handler_send_req(sk, | |
957 | PNS_PEP_DISCONNECT_UTID, PNS_PEP_DISCONNECT_REQ, | |
958 | GFP_KERNEL); | |
959 | ||
960 | pn->pipe_state = PIPE_IDLE; | |
961 | sk->sk_state = TCP_CLOSE; | |
962 | } | |
963 | #endif | |
964 | ||
02a47617 RDC |
965 | ifindex = pn->ifindex; |
966 | pn->ifindex = 0; | |
9641458d | 967 | release_sock(sk); |
02a47617 RDC |
968 | |
969 | if (ifindex) | |
970 | gprs_detach(sk); | |
e513480e | 971 | sock_put(sk); |
9641458d RDC |
972 | } |
973 | ||
974 | static int pep_wait_connreq(struct sock *sk, int noblock) | |
975 | { | |
976 | struct task_struct *tsk = current; | |
977 | struct pep_sock *pn = pep_sk(sk); | |
978 | long timeo = sock_rcvtimeo(sk, noblock); | |
979 | ||
980 | for (;;) { | |
981 | DEFINE_WAIT(wait); | |
982 | ||
983 | if (sk->sk_state != TCP_LISTEN) | |
984 | return -EINVAL; | |
985 | if (!hlist_empty(&pn->ackq)) | |
986 | break; | |
987 | if (!timeo) | |
988 | return -EWOULDBLOCK; | |
989 | if (signal_pending(tsk)) | |
990 | return sock_intr_errno(timeo); | |
991 | ||
43815482 | 992 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
9641458d RDC |
993 | TASK_INTERRUPTIBLE); |
994 | release_sock(sk); | |
995 | timeo = schedule_timeout(timeo); | |
996 | lock_sock(sk); | |
43815482 | 997 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
998 | } |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) | |
1004 | { | |
1005 | struct pep_sock *pn = pep_sk(sk); | |
1006 | struct sock *newsk = NULL; | |
1007 | struct sk_buff *oskb; | |
1008 | int err; | |
1009 | ||
1010 | lock_sock(sk); | |
1011 | err = pep_wait_connreq(sk, flags & O_NONBLOCK); | |
1012 | if (err) | |
1013 | goto out; | |
1014 | ||
1015 | newsk = __sk_head(&pn->ackq); | |
1016 | ||
1017 | oskb = skb_dequeue(&newsk->sk_receive_queue); | |
1018 | err = pep_accept_conn(newsk, oskb); | |
1019 | if (err) { | |
1020 | skb_queue_head(&newsk->sk_receive_queue, oskb); | |
1021 | newsk = NULL; | |
1022 | goto out; | |
1023 | } | |
635f0815 | 1024 | kfree_skb(oskb); |
9641458d RDC |
1025 | |
1026 | sock_hold(sk); | |
1027 | pep_sk(newsk)->listener = sk; | |
1028 | ||
1029 | sock_hold(newsk); | |
1030 | sk_del_node_init(newsk); | |
1031 | sk_acceptq_removed(sk); | |
1032 | sk_add_node(newsk, &pn->hlist); | |
1033 | __sock_put(newsk); | |
1034 | ||
1035 | out: | |
1036 | release_sock(sk); | |
1037 | *errp = err; | |
1038 | return newsk; | |
1039 | } | |
1040 | ||
b3d62553 KS |
1041 | #ifdef CONFIG_PHONET_PIPECTRLR |
1042 | static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len) | |
1043 | { | |
1044 | struct pep_sock *pn = pep_sk(sk); | |
1045 | struct sockaddr_pn *spn = (struct sockaddr_pn *)addr; | |
1046 | ||
1047 | memcpy(&pn->remote_pep, spn, sizeof(struct sockaddr_pn)); | |
1048 | ||
1049 | return pipe_handler_send_req(sk, | |
1050 | PNS_PEP_CONNECT_UTID, PNS_PEP_CONNECT_REQ, | |
1051 | GFP_ATOMIC); | |
1052 | } | |
1053 | #endif | |
1054 | ||
9641458d RDC |
1055 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1056 | { | |
c41bd97f | 1057 | struct pep_sock *pn = pep_sk(sk); |
9641458d RDC |
1058 | int answ; |
1059 | ||
1060 | switch (cmd) { | |
1061 | case SIOCINQ: | |
1062 | if (sk->sk_state == TCP_LISTEN) | |
1063 | return -EINVAL; | |
1064 | ||
1065 | lock_sock(sk); | |
f64f9e71 JP |
1066 | if (sock_flag(sk, SOCK_URGINLINE) && |
1067 | !skb_queue_empty(&pn->ctrlreq_queue)) | |
c41bd97f RDC |
1068 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
1069 | else if (!skb_queue_empty(&sk->sk_receive_queue)) | |
9641458d RDC |
1070 | answ = skb_peek(&sk->sk_receive_queue)->len; |
1071 | else | |
1072 | answ = 0; | |
1073 | release_sock(sk); | |
1074 | return put_user(answ, (int __user *)arg); | |
1075 | } | |
1076 | ||
1077 | return -ENOIOCTLCMD; | |
1078 | } | |
1079 | ||
1080 | static int pep_init(struct sock *sk) | |
1081 | { | |
1082 | struct pep_sock *pn = pep_sk(sk); | |
1083 | ||
1084 | INIT_HLIST_HEAD(&pn->ackq); | |
1085 | INIT_HLIST_HEAD(&pn->hlist); | |
c41bd97f | 1086 | skb_queue_head_init(&pn->ctrlreq_queue); |
9641458d RDC |
1087 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
1088 | return 0; | |
1089 | } | |
1090 | ||
02a47617 | 1091 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1092 | char __user *optval, unsigned int optlen) |
02a47617 RDC |
1093 | { |
1094 | struct pep_sock *pn = pep_sk(sk); | |
1095 | int val = 0, err = 0; | |
1096 | ||
1097 | if (level != SOL_PNPIPE) | |
1098 | return -ENOPROTOOPT; | |
1099 | if (optlen >= sizeof(int)) { | |
1100 | if (get_user(val, (int __user *) optval)) | |
1101 | return -EFAULT; | |
1102 | } | |
1103 | ||
1104 | lock_sock(sk); | |
1105 | switch (optname) { | |
8d98efa8 | 1106 | #ifdef CONFIG_PHONET_PIPECTRLR |
b3d62553 | 1107 | case PNPIPE_PIPE_HANDLE: |
8d98efa8 KS |
1108 | if (val) { |
1109 | if (pn->pipe_state > PIPE_IDLE) { | |
1110 | err = -EFAULT; | |
1111 | break; | |
1112 | } | |
b3d62553 | 1113 | pn->pipe_handle = val; |
8d98efa8 KS |
1114 | break; |
1115 | } | |
8d98efa8 KS |
1116 | #endif |
1117 | ||
02a47617 RDC |
1118 | case PNPIPE_ENCAP: |
1119 | if (val && val != PNPIPE_ENCAP_IP) { | |
1120 | err = -EINVAL; | |
1121 | break; | |
1122 | } | |
1123 | if (!pn->ifindex == !val) | |
1124 | break; /* Nothing to do! */ | |
1125 | if (!capable(CAP_NET_ADMIN)) { | |
1126 | err = -EPERM; | |
1127 | break; | |
1128 | } | |
1129 | if (val) { | |
1130 | release_sock(sk); | |
1131 | err = gprs_attach(sk); | |
1132 | if (err > 0) { | |
1133 | pn->ifindex = err; | |
1134 | err = 0; | |
1135 | } | |
1136 | } else { | |
1137 | pn->ifindex = 0; | |
1138 | release_sock(sk); | |
1139 | gprs_detach(sk); | |
1140 | err = 0; | |
1141 | } | |
1142 | goto out_norel; | |
03789f26 RDC |
1143 | |
1144 | #ifdef CONFIG_PHONET_PIPECTRLR | |
1145 | case PNPIPE_ENABLE: | |
1146 | if (pn->pipe_state <= PIPE_IDLE) { | |
1147 | err = -ENOTCONN; | |
1148 | break; | |
1149 | } | |
1150 | err = pipe_handler_enable_pipe(sk, val); | |
1151 | break; | |
1152 | #endif | |
1153 | ||
02a47617 RDC |
1154 | default: |
1155 | err = -ENOPROTOOPT; | |
1156 | } | |
1157 | release_sock(sk); | |
1158 | ||
1159 | out_norel: | |
1160 | return err; | |
1161 | } | |
1162 | ||
1163 | static int pep_getsockopt(struct sock *sk, int level, int optname, | |
1164 | char __user *optval, int __user *optlen) | |
1165 | { | |
1166 | struct pep_sock *pn = pep_sk(sk); | |
1167 | int len, val; | |
1168 | ||
1169 | if (level != SOL_PNPIPE) | |
1170 | return -ENOPROTOOPT; | |
1171 | if (get_user(len, optlen)) | |
1172 | return -EFAULT; | |
1173 | ||
1174 | switch (optname) { | |
1175 | case PNPIPE_ENCAP: | |
1176 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; | |
1177 | break; | |
8d98efa8 | 1178 | |
03789f26 RDC |
1179 | case PNPIPE_IFINDEX: |
1180 | val = pn->ifindex; | |
1181 | break; | |
1182 | ||
8d98efa8 | 1183 | #ifdef CONFIG_PHONET_PIPECTRLR |
03789f26 RDC |
1184 | case PNPIPE_ENABLE: |
1185 | if (pn->pipe_state <= PIPE_IDLE) | |
1186 | return -ENOTCONN; | |
1187 | val = pn->pipe_state != PIPE_DISABLED; | |
8d98efa8 KS |
1188 | break; |
1189 | #endif | |
1190 | ||
02a47617 RDC |
1191 | default: |
1192 | return -ENOPROTOOPT; | |
1193 | } | |
1194 | ||
1195 | len = min_t(unsigned int, sizeof(int), len); | |
1196 | if (put_user(len, optlen)) | |
1197 | return -EFAULT; | |
1198 | if (put_user(val, (int __user *) optval)) | |
1199 | return -EFAULT; | |
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) | |
1204 | { | |
1205 | struct pep_sock *pn = pep_sk(sk); | |
1206 | struct pnpipehdr *ph; | |
e1a5964f | 1207 | int err; |
02a47617 | 1208 | |
be677730 RDC |
1209 | if (pn_flow_safe(pn->tx_fc) && |
1210 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { | |
1211 | kfree_skb(skb); | |
1212 | return -ENOBUFS; | |
1213 | } | |
1214 | ||
fea93ece | 1215 | skb_push(skb, 3 + pn->aligned); |
02a47617 RDC |
1216 | skb_reset_transport_header(skb); |
1217 | ph = pnp_hdr(skb); | |
1218 | ph->utid = 0; | |
fea93ece RDC |
1219 | if (pn->aligned) { |
1220 | ph->message_id = PNS_PIPE_ALIGNED_DATA; | |
1221 | ph->data[0] = 0; /* padding */ | |
1222 | } else | |
1223 | ph->message_id = PNS_PIPE_DATA; | |
02a47617 | 1224 | ph->pipe_handle = pn->pipe_handle; |
8d98efa8 | 1225 | #ifdef CONFIG_PHONET_PIPECTRLR |
b3d62553 | 1226 | err = pn_skb_send(sk, skb, &pn->remote_pep); |
8d98efa8 | 1227 | #else |
e1a5964f | 1228 | err = pn_skb_send(sk, skb, &pipe_srv); |
8d98efa8 | 1229 | #endif |
e1a5964f RDC |
1230 | |
1231 | if (err && pn_flow_safe(pn->tx_fc)) | |
1232 | atomic_inc(&pn->tx_credits); | |
1233 | return err; | |
1234 | ||
02a47617 RDC |
1235 | } |
1236 | ||
9641458d RDC |
1237 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
1238 | struct msghdr *msg, size_t len) | |
1239 | { | |
1240 | struct pep_sock *pn = pep_sk(sk); | |
b1704374 | 1241 | struct sk_buff *skb; |
9641458d RDC |
1242 | long timeo; |
1243 | int flags = msg->msg_flags; | |
1244 | int err, done; | |
1245 | ||
82ecbcb9 RDC |
1246 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
1247 | MSG_CMSG_COMPAT)) || | |
1248 | !(msg->msg_flags & MSG_EOR)) | |
9641458d RDC |
1249 | return -EOPNOTSUPP; |
1250 | ||
b1704374 RDC |
1251 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
1252 | flags & MSG_DONTWAIT, &err); | |
1253 | if (!skb) | |
02ac3268 | 1254 | return err; |
b1704374 RDC |
1255 | |
1256 | skb_reserve(skb, MAX_PHONET_HEADER + 3); | |
1257 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); | |
1258 | if (err < 0) | |
1259 | goto outfree; | |
1260 | ||
9641458d RDC |
1261 | lock_sock(sk); |
1262 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1263 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { | |
1264 | err = -ENOTCONN; | |
1265 | goto out; | |
1266 | } | |
1267 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1268 | /* Wait until the pipe gets to enabled state */ | |
1269 | disabled: | |
1270 | err = sk_stream_wait_connect(sk, &timeo); | |
1271 | if (err) | |
1272 | goto out; | |
1273 | ||
1274 | if (sk->sk_state == TCP_CLOSE_WAIT) { | |
1275 | err = -ECONNRESET; | |
1276 | goto out; | |
1277 | } | |
1278 | } | |
1279 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
1280 | ||
1281 | /* Wait until flow control allows TX */ | |
be677730 | 1282 | done = atomic_read(&pn->tx_credits); |
9641458d RDC |
1283 | while (!done) { |
1284 | DEFINE_WAIT(wait); | |
1285 | ||
1286 | if (!timeo) { | |
1287 | err = -EAGAIN; | |
1288 | goto out; | |
1289 | } | |
1290 | if (signal_pending(current)) { | |
1291 | err = sock_intr_errno(timeo); | |
1292 | goto out; | |
1293 | } | |
1294 | ||
43815482 | 1295 | prepare_to_wait(sk_sleep(sk), &wait, |
9641458d | 1296 | TASK_INTERRUPTIBLE); |
be677730 | 1297 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
43815482 | 1298 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
1299 | |
1300 | if (sk->sk_state != TCP_ESTABLISHED) | |
1301 | goto disabled; | |
1302 | } | |
1303 | ||
02a47617 | 1304 | err = pipe_skb_send(sk, skb); |
9641458d RDC |
1305 | if (err >= 0) |
1306 | err = len; /* success! */ | |
1307 | skb = NULL; | |
1308 | out: | |
1309 | release_sock(sk); | |
b1704374 | 1310 | outfree: |
9641458d RDC |
1311 | kfree_skb(skb); |
1312 | return err; | |
1313 | } | |
1314 | ||
02a47617 RDC |
1315 | int pep_writeable(struct sock *sk) |
1316 | { | |
1317 | struct pep_sock *pn = pep_sk(sk); | |
1318 | ||
be677730 | 1319 | return atomic_read(&pn->tx_credits); |
02a47617 RDC |
1320 | } |
1321 | ||
1322 | int pep_write(struct sock *sk, struct sk_buff *skb) | |
1323 | { | |
1324 | struct sk_buff *rskb, *fs; | |
1325 | int flen = 0; | |
1326 | ||
fea93ece RDC |
1327 | if (pep_sk(sk)->aligned) |
1328 | return pipe_skb_send(sk, skb); | |
1329 | ||
02a47617 RDC |
1330 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
1331 | if (!rskb) { | |
1332 | kfree_skb(skb); | |
1333 | return -ENOMEM; | |
1334 | } | |
1335 | skb_shinfo(rskb)->frag_list = skb; | |
1336 | rskb->len += skb->len; | |
1337 | rskb->data_len += rskb->len; | |
1338 | rskb->truesize += rskb->len; | |
1339 | ||
1340 | /* Avoid nested fragments */ | |
5c313e9a | 1341 | skb_walk_frags(skb, fs) |
02a47617 RDC |
1342 | flen += fs->len; |
1343 | skb->next = skb_shinfo(skb)->frag_list; | |
5c313e9a | 1344 | skb_frag_list_init(skb); |
02a47617 RDC |
1345 | skb->len -= flen; |
1346 | skb->data_len -= flen; | |
1347 | skb->truesize -= flen; | |
1348 | ||
1349 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); | |
1350 | return pipe_skb_send(sk, rskb); | |
1351 | } | |
1352 | ||
1353 | struct sk_buff *pep_read(struct sock *sk) | |
1354 | { | |
1355 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); | |
1356 | ||
1357 | if (sk->sk_state == TCP_ESTABLISHED) | |
1358 | pipe_grant_credits(sk); | |
1359 | return skb; | |
1360 | } | |
1361 | ||
9641458d RDC |
1362 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
1363 | struct msghdr *msg, size_t len, int noblock, | |
1364 | int flags, int *addr_len) | |
1365 | { | |
1366 | struct sk_buff *skb; | |
1367 | int err; | |
1368 | ||
82ecbcb9 RDC |
1369 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
1370 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) | |
1371 | return -EOPNOTSUPP; | |
1372 | ||
9641458d RDC |
1373 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
1374 | return -ENOTCONN; | |
1375 | ||
c41bd97f RDC |
1376 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
1377 | /* Dequeue and acknowledge control request */ | |
1378 | struct pep_sock *pn = pep_sk(sk); | |
1379 | ||
82ecbcb9 RDC |
1380 | if (flags & MSG_PEEK) |
1381 | return -EOPNOTSUPP; | |
c41bd97f RDC |
1382 | skb = skb_dequeue(&pn->ctrlreq_queue); |
1383 | if (skb) { | |
1384 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, | |
1385 | GFP_KERNEL); | |
1386 | msg->msg_flags |= MSG_OOB; | |
1387 | goto copy; | |
1388 | } | |
1389 | if (flags & MSG_OOB) | |
1390 | return -EINVAL; | |
1391 | } | |
1392 | ||
9641458d RDC |
1393 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1394 | lock_sock(sk); | |
1395 | if (skb == NULL) { | |
1396 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) | |
1397 | err = -ECONNRESET; | |
1398 | release_sock(sk); | |
1399 | return err; | |
1400 | } | |
1401 | ||
1402 | if (sk->sk_state == TCP_ESTABLISHED) | |
1403 | pipe_grant_credits(sk); | |
1404 | release_sock(sk); | |
c41bd97f | 1405 | copy: |
9641458d | 1406 | msg->msg_flags |= MSG_EOR; |
9641458d RDC |
1407 | if (skb->len > len) |
1408 | msg->msg_flags |= MSG_TRUNC; | |
1409 | else | |
1410 | len = skb->len; | |
1411 | ||
1412 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
1413 | if (!err) | |
1414 | err = (flags & MSG_TRUNC) ? skb->len : len; | |
1415 | ||
1416 | skb_free_datagram(sk, skb); | |
1417 | return err; | |
1418 | } | |
1419 | ||
1420 | static void pep_sock_unhash(struct sock *sk) | |
1421 | { | |
1422 | struct pep_sock *pn = pep_sk(sk); | |
1423 | struct sock *skparent = NULL; | |
1424 | ||
1425 | lock_sock(sk); | |
b3d62553 KS |
1426 | |
1427 | #ifndef CONFIG_PHONET_PIPECTRLR | |
9641458d RDC |
1428 | if ((1 << sk->sk_state) & ~(TCPF_CLOSE|TCPF_LISTEN)) { |
1429 | skparent = pn->listener; | |
9641458d RDC |
1430 | release_sock(sk); |
1431 | ||
9641458d | 1432 | pn = pep_sk(skparent); |
7dfde179 RDC |
1433 | lock_sock(skparent); |
1434 | sk_del_node_init(sk); | |
1435 | sk = skparent; | |
9641458d | 1436 | } |
b3d62553 | 1437 | #endif |
9641458d RDC |
1438 | /* Unhash a listening sock only when it is closed |
1439 | * and all of its active connected pipes are closed. */ | |
1440 | if (hlist_empty(&pn->hlist)) | |
1441 | pn_sock_unhash(&pn->pn_sk.sk); | |
1442 | release_sock(sk); | |
1443 | ||
1444 | if (skparent) | |
1445 | sock_put(skparent); | |
1446 | } | |
1447 | ||
1448 | static struct proto pep_proto = { | |
1449 | .close = pep_sock_close, | |
1450 | .accept = pep_sock_accept, | |
b3d62553 KS |
1451 | #ifdef CONFIG_PHONET_PIPECTRLR |
1452 | .connect = pep_sock_connect, | |
1453 | #endif | |
9641458d RDC |
1454 | .ioctl = pep_ioctl, |
1455 | .init = pep_init, | |
02a47617 RDC |
1456 | .setsockopt = pep_setsockopt, |
1457 | .getsockopt = pep_getsockopt, | |
9641458d RDC |
1458 | .sendmsg = pep_sendmsg, |
1459 | .recvmsg = pep_recvmsg, | |
1460 | .backlog_rcv = pep_do_rcv, | |
1461 | .hash = pn_sock_hash, | |
1462 | .unhash = pep_sock_unhash, | |
1463 | .get_port = pn_sock_get_port, | |
1464 | .obj_size = sizeof(struct pep_sock), | |
1465 | .owner = THIS_MODULE, | |
1466 | .name = "PNPIPE", | |
1467 | }; | |
1468 | ||
1469 | static struct phonet_protocol pep_pn_proto = { | |
1470 | .ops = &phonet_stream_ops, | |
1471 | .prot = &pep_proto, | |
1472 | .sock_type = SOCK_SEQPACKET, | |
1473 | }; | |
1474 | ||
1475 | static int __init pep_register(void) | |
1476 | { | |
1477 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); | |
1478 | } | |
1479 | ||
1480 | static void __exit pep_unregister(void) | |
1481 | { | |
1482 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); | |
1483 | } | |
1484 | ||
1485 | module_init(pep_register); | |
1486 | module_exit(pep_unregister); | |
1487 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); | |
1488 | MODULE_DESCRIPTION("Phonet pipe protocol"); | |
1489 | MODULE_LICENSE("GPL"); | |
1490 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |