Commit | Line | Data |
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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: | |
f7ae8d59 | 45 | * - sk_state, hlist: sock lock needed |
9641458d RDC |
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 | ||
44c9ab16 RDC |
80 | static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload, |
81 | int len, gfp_t priority) | |
82 | { | |
83 | struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); | |
84 | if (!skb) | |
85 | return NULL; | |
86 | skb_set_owner_w(skb, sk); | |
87 | ||
88 | skb_reserve(skb, MAX_PNPIPE_HEADER); | |
89 | __skb_put(skb, len); | |
90 | skb_copy_to_linear_data(skb, payload, len); | |
91 | __skb_push(skb, sizeof(struct pnpipehdr)); | |
92 | skb_reset_transport_header(skb); | |
93 | return skb; | |
94 | } | |
95 | ||
96 | static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code, | |
97 | const void *data, int len, gfp_t priority) | |
9641458d RDC |
98 | { |
99 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
100 | struct pnpipehdr *ph; | |
101 | struct sk_buff *skb; | |
14ba8fae | 102 | struct sockaddr_pn peer; |
9641458d | 103 | |
44c9ab16 | 104 | skb = pep_alloc_skb(sk, data, len, priority); |
9641458d RDC |
105 | if (!skb) |
106 | return -ENOMEM; | |
9641458d | 107 | |
9641458d RDC |
108 | ph = pnp_hdr(skb); |
109 | ph->utid = oph->utid; | |
110 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ | |
111 | ph->pipe_handle = oph->pipe_handle; | |
112 | ph->error_code = code; | |
113 | ||
14ba8fae RDC |
114 | pn_skb_get_src_sockaddr(oskb, &peer); |
115 | return pn_skb_send(sk, skb, &peer); | |
9641458d RDC |
116 | } |
117 | ||
44c9ab16 RDC |
118 | static int pep_indicate(struct sock *sk, u8 id, u8 code, |
119 | const void *data, int len, gfp_t priority) | |
8d98efa8 | 120 | { |
44c9ab16 | 121 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
122 | struct pnpipehdr *ph; |
123 | struct sk_buff *skb; | |
8d98efa8 | 124 | |
44c9ab16 | 125 | skb = pep_alloc_skb(sk, data, len, priority); |
8d98efa8 KS |
126 | if (!skb) |
127 | return -ENOMEM; | |
8d98efa8 | 128 | |
8d98efa8 | 129 | ph = pnp_hdr(skb); |
44c9ab16 RDC |
130 | ph->utid = 0; |
131 | ph->message_id = id; | |
b3d62553 | 132 | ph->pipe_handle = pn->pipe_handle; |
44c9ab16 | 133 | ph->data[0] = code; |
14ba8fae | 134 | return pn_skb_send(sk, skb, NULL); |
8d98efa8 KS |
135 | } |
136 | ||
44c9ab16 RDC |
137 | #define PAD 0x00 |
138 | ||
44c9ab16 RDC |
139 | static int pipe_handler_request(struct sock *sk, u8 id, u8 code, |
140 | const void *data, int len) | |
8d98efa8 | 141 | { |
44c9ab16 | 142 | struct pep_sock *pn = pep_sk(sk); |
8d98efa8 KS |
143 | struct pnpipehdr *ph; |
144 | struct sk_buff *skb; | |
8d98efa8 | 145 | |
44c9ab16 | 146 | skb = pep_alloc_skb(sk, data, len, GFP_KERNEL); |
8d98efa8 KS |
147 | if (!skb) |
148 | return -ENOMEM; | |
8d98efa8 | 149 | |
8d98efa8 | 150 | ph = pnp_hdr(skb); |
44c9ab16 RDC |
151 | ph->utid = id; /* whatever */ |
152 | ph->message_id = id; | |
b3d62553 | 153 | ph->pipe_handle = pn->pipe_handle; |
44c9ab16 | 154 | ph->data[0] = code; |
14ba8fae | 155 | return pn_skb_send(sk, skb, NULL); |
8d98efa8 KS |
156 | } |
157 | ||
44c9ab16 | 158 | static int pipe_handler_send_created_ind(struct sock *sk) |
8d98efa8 | 159 | { |
b3d62553 | 160 | struct pep_sock *pn = pep_sk(sk); |
44c9ab16 RDC |
161 | u8 data[4] = { |
162 | PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2), | |
163 | pn->tx_fc, pn->rx_fc, | |
164 | }; | |
8d98efa8 | 165 | |
44c9ab16 RDC |
166 | return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */, |
167 | data, 4, GFP_ATOMIC); | |
168 | } | |
8d98efa8 | 169 | |
9641458d RDC |
170 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
171 | { | |
172 | static const u8 data[20] = { | |
173 | PAD, PAD, PAD, 2 /* sub-blocks */, | |
174 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, | |
175 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
176 | PN_ONE_CREDIT_FLOW_CONTROL, | |
177 | PN_LEGACY_FLOW_CONTROL, | |
178 | PAD, | |
179 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, | |
180 | PN_MULTI_CREDIT_FLOW_CONTROL, | |
181 | PN_ONE_CREDIT_FLOW_CONTROL, | |
182 | PN_LEGACY_FLOW_CONTROL, | |
183 | PAD, | |
184 | }; | |
185 | ||
186 | might_sleep(); | |
187 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), | |
188 | GFP_KERNEL); | |
189 | } | |
190 | ||
f7ae8d59 RDC |
191 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code, |
192 | gfp_t priority) | |
9641458d RDC |
193 | { |
194 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; | |
195 | WARN_ON(code == PN_PIPE_NO_ERROR); | |
f7ae8d59 | 196 | return pep_reply(sk, skb, code, data, sizeof(data), priority); |
9641458d RDC |
197 | } |
198 | ||
199 | /* Control requests are not sent by the pipe service and have a specific | |
200 | * message format. */ | |
c41bd97f RDC |
201 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
202 | gfp_t priority) | |
9641458d RDC |
203 | { |
204 | const struct pnpipehdr *oph = pnp_hdr(oskb); | |
205 | struct sk_buff *skb; | |
206 | struct pnpipehdr *ph; | |
207 | struct sockaddr_pn dst; | |
44c9ab16 RDC |
208 | u8 data[4] = { |
209 | oph->data[0], /* PEP type */ | |
210 | code, /* error code, at an unusual offset */ | |
211 | PAD, PAD, | |
212 | }; | |
9641458d | 213 | |
44c9ab16 | 214 | skb = pep_alloc_skb(sk, data, 4, priority); |
9641458d RDC |
215 | if (!skb) |
216 | return -ENOMEM; | |
9641458d | 217 | |
44c9ab16 | 218 | ph = pnp_hdr(skb); |
9641458d RDC |
219 | ph->utid = oph->utid; |
220 | ph->message_id = PNS_PEP_CTRL_RESP; | |
221 | ph->pipe_handle = oph->pipe_handle; | |
222 | ph->data[0] = oph->data[1]; /* CTRL id */ | |
9641458d RDC |
223 | |
224 | pn_skb_get_src_sockaddr(oskb, &dst); | |
225 | return pn_skb_send(sk, skb, &dst); | |
226 | } | |
227 | ||
228 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) | |
229 | { | |
44c9ab16 | 230 | u8 data[4] = { type, PAD, PAD, status }; |
9641458d | 231 | |
44c9ab16 RDC |
232 | return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON, |
233 | data, 4, priority); | |
9641458d RDC |
234 | } |
235 | ||
236 | /* Send our RX flow control information to the sender. | |
237 | * Socket must be locked. */ | |
44c9ab16 | 238 | static void pipe_grant_credits(struct sock *sk, gfp_t priority) |
9641458d RDC |
239 | { |
240 | struct pep_sock *pn = pep_sk(sk); | |
241 | ||
242 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
243 | ||
244 | switch (pn->rx_fc) { | |
245 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ | |
246 | break; | |
247 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
44c9ab16 RDC |
248 | if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, |
249 | PEP_IND_READY, priority) == 0) | |
250 | pn->rx_credits = 1; | |
9641458d RDC |
251 | break; |
252 | case PN_MULTI_CREDIT_FLOW_CONTROL: | |
253 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) | |
254 | break; | |
255 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, | |
256 | CREDITS_MAX - pn->rx_credits, | |
44c9ab16 | 257 | priority) == 0) |
9641458d RDC |
258 | pn->rx_credits = CREDITS_MAX; |
259 | break; | |
260 | } | |
261 | } | |
262 | ||
263 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) | |
264 | { | |
265 | struct pep_sock *pn = pep_sk(sk); | |
a91e7d47 | 266 | struct pnpipehdr *hdr; |
be677730 | 267 | int wake = 0; |
9641458d RDC |
268 | |
269 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
270 | return -EINVAL; | |
271 | ||
a91e7d47 | 272 | hdr = pnp_hdr(skb); |
9641458d RDC |
273 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
274 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", | |
275 | (unsigned)hdr->data[0]); | |
276 | return -EOPNOTSUPP; | |
277 | } | |
278 | ||
279 | switch (hdr->data[1]) { | |
280 | case PN_PEP_IND_FLOW_CONTROL: | |
281 | switch (pn->tx_fc) { | |
282 | case PN_LEGACY_FLOW_CONTROL: | |
283 | switch (hdr->data[4]) { | |
284 | case PEP_IND_BUSY: | |
be677730 | 285 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
286 | break; |
287 | case PEP_IND_READY: | |
be677730 | 288 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
289 | break; |
290 | } | |
291 | break; | |
292 | case PN_ONE_CREDIT_FLOW_CONTROL: | |
293 | if (hdr->data[4] == PEP_IND_READY) | |
be677730 | 294 | atomic_set(&pn->tx_credits, wake = 1); |
9641458d RDC |
295 | break; |
296 | } | |
297 | break; | |
298 | ||
299 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: | |
300 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) | |
301 | break; | |
be677730 | 302 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
9641458d RDC |
303 | break; |
304 | ||
305 | default: | |
306 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", | |
307 | (unsigned)hdr->data[1]); | |
308 | return -EOPNOTSUPP; | |
309 | } | |
be677730 | 310 | if (wake) |
9641458d RDC |
311 | sk->sk_write_space(sk); |
312 | return 0; | |
313 | } | |
314 | ||
315 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) | |
316 | { | |
317 | struct pep_sock *pn = pep_sk(sk); | |
318 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
319 | u8 n_sb = hdr->data[0]; | |
320 | ||
321 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
322 | __skb_pull(skb, sizeof(*hdr)); | |
323 | while (n_sb > 0) { | |
324 | u8 type, buf[2], len = sizeof(buf); | |
325 | u8 *data = pep_get_sb(skb, &type, &len, buf); | |
326 | ||
327 | if (data == NULL) | |
328 | return -EINVAL; | |
329 | switch (type) { | |
330 | case PN_PIPE_SB_NEGOTIATED_FC: | |
331 | if (len < 2 || (data[0] | data[1]) > 3) | |
332 | break; | |
333 | pn->tx_fc = data[0] & 3; | |
334 | pn->rx_fc = data[1] & 3; | |
335 | break; | |
336 | } | |
337 | n_sb--; | |
338 | } | |
339 | return 0; | |
340 | } | |
341 | ||
342 | /* Queue an skb to a connected sock. | |
343 | * Socket lock must be held. */ | |
344 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) | |
345 | { | |
346 | struct pep_sock *pn = pep_sk(sk); | |
347 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
c41bd97f | 348 | struct sk_buff_head *queue; |
9641458d RDC |
349 | int err = 0; |
350 | ||
351 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); | |
352 | ||
353 | switch (hdr->message_id) { | |
354 | case PNS_PEP_CONNECT_REQ: | |
f7ae8d59 | 355 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_ATOMIC); |
9641458d RDC |
356 | break; |
357 | ||
358 | case PNS_PEP_DISCONNECT_REQ: | |
359 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
360 | sk->sk_state = TCP_CLOSE_WAIT; | |
361 | if (!sock_flag(sk, SOCK_DEAD)) | |
362 | sk->sk_state_change(sk); | |
363 | break; | |
364 | ||
365 | case PNS_PEP_ENABLE_REQ: | |
366 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ | |
367 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
368 | break; | |
369 | ||
370 | case PNS_PEP_RESET_REQ: | |
371 | switch (hdr->state_after_reset) { | |
372 | case PN_PIPE_DISABLE: | |
373 | pn->init_enable = 0; | |
374 | break; | |
375 | case PN_PIPE_ENABLE: | |
376 | pn->init_enable = 1; | |
377 | break; | |
378 | default: /* not allowed to send an error here!? */ | |
379 | err = -EINVAL; | |
380 | goto out; | |
381 | } | |
382 | /* fall through */ | |
383 | case PNS_PEP_DISABLE_REQ: | |
be677730 | 384 | atomic_set(&pn->tx_credits, 0); |
9641458d RDC |
385 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
386 | break; | |
387 | ||
388 | case PNS_PEP_CTRL_REQ: | |
2e2fb4b3 RDC |
389 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
390 | atomic_inc(&sk->sk_drops); | |
c41bd97f | 391 | break; |
2e2fb4b3 | 392 | } |
c41bd97f RDC |
393 | __skb_pull(skb, 4); |
394 | queue = &pn->ctrlreq_queue; | |
395 | goto queue; | |
9641458d | 396 | |
fc6a1107 RDC |
397 | case PNS_PIPE_ALIGNED_DATA: |
398 | __skb_pull(skb, 1); | |
399 | /* fall through */ | |
9641458d RDC |
400 | case PNS_PIPE_DATA: |
401 | __skb_pull(skb, 3); /* Pipe data header */ | |
402 | if (!pn_flow_safe(pn->rx_fc)) { | |
403 | err = sock_queue_rcv_skb(sk, skb); | |
404 | if (!err) | |
0ebbf318 RDC |
405 | return NET_RX_SUCCESS; |
406 | err = -ENOBUFS; | |
9641458d RDC |
407 | break; |
408 | } | |
409 | ||
410 | if (pn->rx_credits == 0) { | |
2e2fb4b3 | 411 | atomic_inc(&sk->sk_drops); |
9641458d RDC |
412 | err = -ENOBUFS; |
413 | break; | |
414 | } | |
415 | pn->rx_credits--; | |
c41bd97f RDC |
416 | queue = &sk->sk_receive_queue; |
417 | goto queue; | |
9641458d RDC |
418 | |
419 | case PNS_PEP_STATUS_IND: | |
420 | pipe_rcv_status(sk, skb); | |
421 | break; | |
422 | ||
423 | case PNS_PIPE_REDIRECTED_IND: | |
424 | err = pipe_rcv_created(sk, skb); | |
425 | break; | |
426 | ||
427 | case PNS_PIPE_CREATED_IND: | |
428 | err = pipe_rcv_created(sk, skb); | |
429 | if (err) | |
430 | break; | |
431 | /* fall through */ | |
432 | case PNS_PIPE_RESET_IND: | |
433 | if (!pn->init_enable) | |
434 | break; | |
435 | /* fall through */ | |
436 | case PNS_PIPE_ENABLED_IND: | |
437 | if (!pn_flow_safe(pn->tx_fc)) { | |
be677730 | 438 | atomic_set(&pn->tx_credits, 1); |
9641458d RDC |
439 | sk->sk_write_space(sk); |
440 | } | |
441 | if (sk->sk_state == TCP_ESTABLISHED) | |
442 | break; /* Nothing to do */ | |
443 | sk->sk_state = TCP_ESTABLISHED; | |
44c9ab16 | 444 | pipe_grant_credits(sk, GFP_ATOMIC); |
9641458d RDC |
445 | break; |
446 | ||
447 | case PNS_PIPE_DISABLED_IND: | |
448 | sk->sk_state = TCP_SYN_RECV; | |
449 | pn->rx_credits = 0; | |
450 | break; | |
451 | ||
452 | default: | |
453 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", | |
454 | hdr->message_id); | |
455 | err = -EINVAL; | |
456 | } | |
457 | out: | |
458 | kfree_skb(skb); | |
0ebbf318 | 459 | return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS; |
c41bd97f RDC |
460 | |
461 | queue: | |
462 | skb->dev = NULL; | |
463 | skb_set_owner_r(skb, sk); | |
464 | err = skb->len; | |
465 | skb_queue_tail(queue, skb); | |
466 | if (!sock_flag(sk, SOCK_DEAD)) | |
467 | sk->sk_data_ready(sk, err); | |
0ebbf318 | 468 | return NET_RX_SUCCESS; |
9641458d RDC |
469 | } |
470 | ||
471 | /* Destroy connected sock. */ | |
472 | static void pipe_destruct(struct sock *sk) | |
473 | { | |
c41bd97f RDC |
474 | struct pep_sock *pn = pep_sk(sk); |
475 | ||
9641458d | 476 | skb_queue_purge(&sk->sk_receive_queue); |
c41bd97f | 477 | skb_queue_purge(&pn->ctrlreq_queue); |
9641458d RDC |
478 | } |
479 | ||
8f44fcc7 RDC |
480 | static u8 pipe_negotiate_fc(const u8 *fcs, unsigned n) |
481 | { | |
482 | unsigned i; | |
483 | u8 final_fc = PN_NO_FLOW_CONTROL; | |
484 | ||
485 | for (i = 0; i < n; i++) { | |
486 | u8 fc = fcs[i]; | |
487 | ||
488 | if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL) | |
489 | final_fc = fc; | |
490 | } | |
491 | return final_fc; | |
492 | } | |
493 | ||
b3d62553 KS |
494 | static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb) |
495 | { | |
496 | struct pep_sock *pn = pep_sk(sk); | |
8f44fcc7 RDC |
497 | struct pnpipehdr *hdr; |
498 | u8 n_sb; | |
499 | ||
500 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) | |
501 | return -EINVAL; | |
502 | ||
503 | hdr = pnp_hdr(skb); | |
297edb60 RDC |
504 | if (hdr->error_code != PN_PIPE_NO_ERROR) |
505 | return -ECONNREFUSED; | |
8f44fcc7 RDC |
506 | |
507 | /* Parse sub-blocks */ | |
508 | n_sb = hdr->data[4]; | |
509 | while (n_sb > 0) { | |
510 | u8 type, buf[6], len = sizeof(buf); | |
511 | const u8 *data = pep_get_sb(skb, &type, &len, buf); | |
512 | ||
513 | if (data == NULL) | |
514 | return -EINVAL; | |
515 | ||
516 | switch (type) { | |
517 | case PN_PIPE_SB_REQUIRED_FC_TX: | |
518 | if (len < 2 || len < data[0]) | |
519 | break; | |
520 | pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2); | |
521 | break; | |
522 | ||
523 | case PN_PIPE_SB_PREFERRED_FC_RX: | |
524 | if (len < 2 || len < data[0]) | |
525 | break; | |
526 | pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2); | |
527 | break; | |
528 | ||
529 | } | |
530 | n_sb--; | |
531 | } | |
b3d62553 | 532 | |
44c9ab16 | 533 | return pipe_handler_send_created_ind(sk); |
b3d62553 | 534 | } |
297edb60 RDC |
535 | |
536 | /* Queue an skb to an actively connected sock. | |
537 | * Socket lock must be held. */ | |
538 | static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb) | |
539 | { | |
540 | struct pep_sock *pn = pep_sk(sk); | |
541 | struct pnpipehdr *hdr = pnp_hdr(skb); | |
542 | int err = NET_RX_SUCCESS; | |
543 | ||
544 | switch (hdr->message_id) { | |
545 | case PNS_PIPE_ALIGNED_DATA: | |
546 | __skb_pull(skb, 1); | |
547 | /* fall through */ | |
548 | case PNS_PIPE_DATA: | |
549 | __skb_pull(skb, 3); /* Pipe data header */ | |
550 | if (!pn_flow_safe(pn->rx_fc)) { | |
551 | err = sock_queue_rcv_skb(sk, skb); | |
552 | if (!err) | |
553 | return NET_RX_SUCCESS; | |
554 | err = NET_RX_DROP; | |
555 | break; | |
556 | } | |
557 | ||
558 | if (pn->rx_credits == 0) { | |
559 | atomic_inc(&sk->sk_drops); | |
560 | err = NET_RX_DROP; | |
561 | break; | |
562 | } | |
563 | pn->rx_credits--; | |
564 | skb->dev = NULL; | |
565 | skb_set_owner_r(skb, sk); | |
566 | err = skb->len; | |
567 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
568 | if (!sock_flag(sk, SOCK_DEAD)) | |
569 | sk->sk_data_ready(sk, err); | |
570 | return NET_RX_SUCCESS; | |
571 | ||
572 | case PNS_PEP_CONNECT_RESP: | |
573 | if (sk->sk_state != TCP_SYN_SENT) | |
574 | break; | |
575 | if (!sock_flag(sk, SOCK_DEAD)) | |
576 | sk->sk_state_change(sk); | |
577 | if (pep_connresp_rcv(sk, skb)) { | |
578 | sk->sk_state = TCP_CLOSE_WAIT; | |
579 | break; | |
580 | } | |
581 | ||
582 | sk->sk_state = TCP_ESTABLISHED; | |
583 | if (!pn_flow_safe(pn->tx_fc)) { | |
584 | atomic_set(&pn->tx_credits, 1); | |
585 | sk->sk_write_space(sk); | |
586 | } | |
587 | pipe_grant_credits(sk, GFP_ATOMIC); | |
588 | break; | |
589 | ||
590 | case PNS_PEP_DISCONNECT_RESP: | |
591 | /* sock should already be dead, nothing to do */ | |
592 | break; | |
593 | ||
594 | case PNS_PEP_STATUS_IND: | |
595 | pipe_rcv_status(sk, skb); | |
596 | break; | |
597 | } | |
598 | kfree_skb(skb); | |
599 | return err; | |
600 | } | |
b3d62553 | 601 | |
9641458d RDC |
602 | /* Listening sock must be locked */ |
603 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, | |
604 | const struct sockaddr_pn *dst, | |
605 | u8 pipe_handle) | |
606 | { | |
607 | struct hlist_node *node; | |
608 | struct sock *sknode; | |
609 | u16 dobj = pn_sockaddr_get_object(dst); | |
610 | ||
611 | sk_for_each(sknode, node, hlist) { | |
612 | struct pep_sock *pnnode = pep_sk(sknode); | |
613 | ||
614 | /* Ports match, but addresses might not: */ | |
615 | if (pnnode->pn_sk.sobject != dobj) | |
616 | continue; | |
617 | if (pnnode->pipe_handle != pipe_handle) | |
618 | continue; | |
619 | if (sknode->sk_state == TCP_CLOSE_WAIT) | |
620 | continue; | |
621 | ||
622 | sock_hold(sknode); | |
623 | return sknode; | |
624 | } | |
625 | return NULL; | |
626 | } | |
627 | ||
628 | /* | |
629 | * Deliver an skb to a listening sock. | |
630 | * Socket lock must be held. | |
631 | * We then queue the skb to the right connected sock (if any). | |
632 | */ | |
633 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) | |
634 | { | |
635 | struct pep_sock *pn = pep_sk(sk); | |
636 | struct sock *sknode; | |
2ddc1ac1 | 637 | struct pnpipehdr *hdr; |
9641458d | 638 | struct sockaddr_pn dst; |
9641458d RDC |
639 | u8 pipe_handle; |
640 | ||
641 | if (!pskb_may_pull(skb, sizeof(*hdr))) | |
642 | goto drop; | |
643 | ||
644 | hdr = pnp_hdr(skb); | |
645 | pipe_handle = hdr->pipe_handle; | |
646 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) | |
647 | goto drop; | |
648 | ||
649 | pn_skb_get_dst_sockaddr(skb, &dst); | |
650 | ||
651 | /* Look for an existing pipe handle */ | |
652 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); | |
653 | if (sknode) | |
654 | return sk_receive_skb(sknode, skb, 1); | |
655 | ||
9641458d RDC |
656 | switch (hdr->message_id) { |
657 | case PNS_PEP_CONNECT_REQ: | |
f7ae8d59 RDC |
658 | if (sk->sk_state != TCP_LISTEN || sk_acceptq_is_full(sk)) { |
659 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, | |
660 | GFP_ATOMIC); | |
661 | break; | |
662 | } | |
663 | skb_queue_head(&sk->sk_receive_queue, skb); | |
664 | sk_acceptq_added(sk); | |
665 | if (!sock_flag(sk, SOCK_DEAD)) | |
666 | sk->sk_data_ready(sk, 0); | |
667 | return NET_RX_SUCCESS; | |
9641458d RDC |
668 | |
669 | case PNS_PEP_DISCONNECT_REQ: | |
670 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); | |
671 | break; | |
672 | ||
673 | case PNS_PEP_CTRL_REQ: | |
c41bd97f | 674 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
9641458d RDC |
675 | break; |
676 | ||
677 | case PNS_PEP_RESET_REQ: | |
678 | case PNS_PEP_ENABLE_REQ: | |
679 | case PNS_PEP_DISABLE_REQ: | |
680 | /* invalid handle is not even allowed here! */ | |
0ebbf318 | 681 | break; |
297edb60 RDC |
682 | |
683 | default: | |
684 | if ((1 << sk->sk_state) | |
685 | & ~(TCPF_CLOSE|TCPF_LISTEN|TCPF_CLOSE_WAIT)) | |
686 | /* actively connected socket */ | |
687 | return pipe_handler_do_rcv(sk, skb); | |
9641458d RDC |
688 | } |
689 | drop: | |
690 | kfree_skb(skb); | |
0ebbf318 | 691 | return NET_RX_SUCCESS; |
9641458d RDC |
692 | } |
693 | ||
6482f554 RDC |
694 | static int pipe_do_remove(struct sock *sk) |
695 | { | |
696 | struct pep_sock *pn = pep_sk(sk); | |
697 | struct pnpipehdr *ph; | |
698 | struct sk_buff *skb; | |
699 | ||
44c9ab16 | 700 | skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL); |
6482f554 RDC |
701 | if (!skb) |
702 | return -ENOMEM; | |
703 | ||
6482f554 RDC |
704 | ph = pnp_hdr(skb); |
705 | ph->utid = 0; | |
706 | ph->message_id = PNS_PIPE_REMOVE_REQ; | |
707 | ph->pipe_handle = pn->pipe_handle; | |
708 | ph->data[0] = PAD; | |
14ba8fae | 709 | return pn_skb_send(sk, skb, NULL); |
6482f554 RDC |
710 | } |
711 | ||
9641458d RDC |
712 | /* associated socket ceases to exist */ |
713 | static void pep_sock_close(struct sock *sk, long timeout) | |
714 | { | |
715 | struct pep_sock *pn = pep_sk(sk); | |
02a47617 | 716 | int ifindex = 0; |
9641458d | 717 | |
e513480e | 718 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
9641458d RDC |
719 | sk_common_release(sk); |
720 | ||
721 | lock_sock(sk); | |
f7ae8d59 | 722 | if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) { |
297edb60 RDC |
723 | if (sk->sk_backlog_rcv == pipe_do_rcv) |
724 | /* Forcefully remove dangling Phonet pipe */ | |
725 | pipe_do_remove(sk); | |
726 | else | |
727 | pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD, | |
728 | NULL, 0); | |
2feb6181 | 729 | } |
f7ae8d59 | 730 | sk->sk_state = TCP_CLOSE; |
b3d62553 | 731 | |
02a47617 RDC |
732 | ifindex = pn->ifindex; |
733 | pn->ifindex = 0; | |
9641458d | 734 | release_sock(sk); |
02a47617 RDC |
735 | |
736 | if (ifindex) | |
737 | gprs_detach(sk); | |
e513480e | 738 | sock_put(sk); |
9641458d RDC |
739 | } |
740 | ||
f7ae8d59 | 741 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) |
9641458d | 742 | { |
f7ae8d59 RDC |
743 | struct pep_sock *pn = pep_sk(sk), *newpn; |
744 | struct sock *newsk = NULL; | |
745 | struct sk_buff *skb; | |
746 | struct pnpipehdr *hdr; | |
747 | struct sockaddr_pn dst, src; | |
748 | int err; | |
749 | u16 peer_type; | |
750 | u8 pipe_handle, enabled, n_sb; | |
751 | u8 aligned = 0; | |
9641458d | 752 | |
f7ae8d59 RDC |
753 | skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp); |
754 | if (!skb) | |
755 | return NULL; | |
9641458d | 756 | |
f7ae8d59 RDC |
757 | lock_sock(sk); |
758 | if (sk->sk_state != TCP_LISTEN) { | |
759 | err = -EINVAL; | |
760 | goto drop; | |
9641458d | 761 | } |
f7ae8d59 | 762 | sk_acceptq_removed(sk); |
9641458d | 763 | |
f7ae8d59 RDC |
764 | err = -EPROTO; |
765 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) | |
766 | goto drop; | |
9641458d | 767 | |
f7ae8d59 RDC |
768 | hdr = pnp_hdr(skb); |
769 | pipe_handle = hdr->pipe_handle; | |
770 | switch (hdr->state_after_connect) { | |
771 | case PN_PIPE_DISABLE: | |
772 | enabled = 0; | |
773 | break; | |
774 | case PN_PIPE_ENABLE: | |
775 | enabled = 1; | |
776 | break; | |
777 | default: | |
778 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM, | |
779 | GFP_KERNEL); | |
780 | goto drop; | |
781 | } | |
782 | peer_type = hdr->other_pep_type << 8; | |
9641458d | 783 | |
f7ae8d59 RDC |
784 | /* Parse sub-blocks (options) */ |
785 | n_sb = hdr->data[4]; | |
786 | while (n_sb > 0) { | |
787 | u8 type, buf[1], len = sizeof(buf); | |
788 | const u8 *data = pep_get_sb(skb, &type, &len, buf); | |
9641458d | 789 | |
f7ae8d59 RDC |
790 | if (data == NULL) |
791 | goto drop; | |
792 | switch (type) { | |
793 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: | |
794 | if (len < 1) | |
795 | goto drop; | |
796 | peer_type = (peer_type & 0xff00) | data[0]; | |
797 | break; | |
798 | case PN_PIPE_SB_ALIGNED_DATA: | |
799 | aligned = data[0] != 0; | |
800 | break; | |
801 | } | |
802 | n_sb--; | |
803 | } | |
9641458d | 804 | |
f7ae8d59 RDC |
805 | /* Check for duplicate pipe handle */ |
806 | newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle); | |
807 | if (unlikely(newsk)) { | |
808 | __sock_put(newsk); | |
9641458d | 809 | newsk = NULL; |
f7ae8d59 RDC |
810 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL); |
811 | goto drop; | |
9641458d RDC |
812 | } |
813 | ||
f7ae8d59 RDC |
814 | /* Create a new to-be-accepted sock */ |
815 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot); | |
816 | if (!newsk) { | |
817 | pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL); | |
818 | err = -ENOBUFS; | |
819 | goto drop; | |
820 | } | |
821 | ||
822 | sock_init_data(NULL, newsk); | |
823 | newsk->sk_state = TCP_SYN_RECV; | |
824 | newsk->sk_backlog_rcv = pipe_do_rcv; | |
825 | newsk->sk_protocol = sk->sk_protocol; | |
826 | newsk->sk_destruct = pipe_destruct; | |
827 | ||
828 | newpn = pep_sk(newsk); | |
829 | pn_skb_get_dst_sockaddr(skb, &dst); | |
830 | pn_skb_get_src_sockaddr(skb, &src); | |
831 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); | |
832 | newpn->pn_sk.dobject = pn_sockaddr_get_object(&src); | |
833 | newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst); | |
9641458d | 834 | sock_hold(sk); |
f7ae8d59 RDC |
835 | newpn->listener = sk; |
836 | skb_queue_head_init(&newpn->ctrlreq_queue); | |
837 | newpn->pipe_handle = pipe_handle; | |
838 | atomic_set(&newpn->tx_credits, 0); | |
839 | newpn->ifindex = 0; | |
840 | newpn->peer_type = peer_type; | |
841 | newpn->rx_credits = 0; | |
842 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
843 | newpn->init_enable = enabled; | |
844 | newpn->aligned = aligned; | |
9641458d | 845 | |
f7ae8d59 RDC |
846 | err = pep_accept_conn(newsk, skb); |
847 | if (err) { | |
848 | sock_put(newsk); | |
849 | newsk = NULL; | |
850 | goto drop; | |
851 | } | |
9641458d | 852 | sk_add_node(newsk, &pn->hlist); |
f7ae8d59 | 853 | drop: |
9641458d | 854 | release_sock(sk); |
f7ae8d59 | 855 | kfree_skb(skb); |
9641458d RDC |
856 | *errp = err; |
857 | return newsk; | |
858 | } | |
859 | ||
b3d62553 KS |
860 | static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len) |
861 | { | |
862 | struct pep_sock *pn = pep_sk(sk); | |
297edb60 | 863 | int err; |
44c9ab16 | 864 | u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD }; |
b3d62553 | 865 | |
acaf7df6 | 866 | pn->pipe_handle = 1; /* anything but INVALID_HANDLE */ |
297edb60 RDC |
867 | err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ, |
868 | PN_PIPE_ENABLE, data, 4); | |
869 | if (err) { | |
870 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; | |
871 | return err; | |
872 | } | |
873 | sk->sk_state = TCP_SYN_SENT; | |
874 | return 0; | |
b3d62553 | 875 | } |
b3d62553 | 876 | |
9641458d RDC |
877 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) |
878 | { | |
c41bd97f | 879 | struct pep_sock *pn = pep_sk(sk); |
9641458d RDC |
880 | int answ; |
881 | ||
882 | switch (cmd) { | |
883 | case SIOCINQ: | |
884 | if (sk->sk_state == TCP_LISTEN) | |
885 | return -EINVAL; | |
886 | ||
887 | lock_sock(sk); | |
f64f9e71 JP |
888 | if (sock_flag(sk, SOCK_URGINLINE) && |
889 | !skb_queue_empty(&pn->ctrlreq_queue)) | |
c41bd97f RDC |
890 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
891 | else if (!skb_queue_empty(&sk->sk_receive_queue)) | |
9641458d RDC |
892 | answ = skb_peek(&sk->sk_receive_queue)->len; |
893 | else | |
894 | answ = 0; | |
895 | release_sock(sk); | |
896 | return put_user(answ, (int __user *)arg); | |
897 | } | |
898 | ||
899 | return -ENOIOCTLCMD; | |
900 | } | |
901 | ||
902 | static int pep_init(struct sock *sk) | |
903 | { | |
904 | struct pep_sock *pn = pep_sk(sk); | |
905 | ||
f7ae8d59 | 906 | sk->sk_destruct = pipe_destruct; |
9641458d | 907 | INIT_HLIST_HEAD(&pn->hlist); |
297edb60 | 908 | pn->listener = NULL; |
c41bd97f | 909 | skb_queue_head_init(&pn->ctrlreq_queue); |
297edb60 RDC |
910 | atomic_set(&pn->tx_credits, 0); |
911 | pn->ifindex = 0; | |
912 | pn->peer_type = 0; | |
9641458d | 913 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
297edb60 RDC |
914 | pn->rx_credits = 0; |
915 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; | |
916 | pn->init_enable = 1; | |
917 | pn->aligned = 0; | |
9641458d RDC |
918 | return 0; |
919 | } | |
920 | ||
02a47617 | 921 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 922 | char __user *optval, unsigned int optlen) |
02a47617 RDC |
923 | { |
924 | struct pep_sock *pn = pep_sk(sk); | |
925 | int val = 0, err = 0; | |
926 | ||
927 | if (level != SOL_PNPIPE) | |
928 | return -ENOPROTOOPT; | |
929 | if (optlen >= sizeof(int)) { | |
930 | if (get_user(val, (int __user *) optval)) | |
931 | return -EFAULT; | |
932 | } | |
933 | ||
934 | lock_sock(sk); | |
935 | switch (optname) { | |
936 | case PNPIPE_ENCAP: | |
937 | if (val && val != PNPIPE_ENCAP_IP) { | |
938 | err = -EINVAL; | |
939 | break; | |
940 | } | |
941 | if (!pn->ifindex == !val) | |
942 | break; /* Nothing to do! */ | |
943 | if (!capable(CAP_NET_ADMIN)) { | |
944 | err = -EPERM; | |
945 | break; | |
946 | } | |
947 | if (val) { | |
948 | release_sock(sk); | |
949 | err = gprs_attach(sk); | |
950 | if (err > 0) { | |
951 | pn->ifindex = err; | |
952 | err = 0; | |
953 | } | |
954 | } else { | |
955 | pn->ifindex = 0; | |
956 | release_sock(sk); | |
957 | gprs_detach(sk); | |
958 | err = 0; | |
959 | } | |
960 | goto out_norel; | |
03789f26 | 961 | |
02a47617 RDC |
962 | default: |
963 | err = -ENOPROTOOPT; | |
964 | } | |
965 | release_sock(sk); | |
966 | ||
967 | out_norel: | |
968 | return err; | |
969 | } | |
970 | ||
971 | static int pep_getsockopt(struct sock *sk, int level, int optname, | |
972 | char __user *optval, int __user *optlen) | |
973 | { | |
974 | struct pep_sock *pn = pep_sk(sk); | |
975 | int len, val; | |
976 | ||
977 | if (level != SOL_PNPIPE) | |
978 | return -ENOPROTOOPT; | |
979 | if (get_user(len, optlen)) | |
980 | return -EFAULT; | |
981 | ||
982 | switch (optname) { | |
983 | case PNPIPE_ENCAP: | |
984 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; | |
985 | break; | |
8d98efa8 | 986 | |
03789f26 RDC |
987 | case PNPIPE_IFINDEX: |
988 | val = pn->ifindex; | |
989 | break; | |
990 | ||
acaf7df6 RDC |
991 | case PNPIPE_HANDLE: |
992 | val = pn->pipe_handle; | |
993 | if (val == PN_PIPE_INVALID_HANDLE) | |
994 | return -EINVAL; | |
995 | break; | |
996 | ||
02a47617 RDC |
997 | default: |
998 | return -ENOPROTOOPT; | |
999 | } | |
1000 | ||
1001 | len = min_t(unsigned int, sizeof(int), len); | |
1002 | if (put_user(len, optlen)) | |
1003 | return -EFAULT; | |
1004 | if (put_user(val, (int __user *) optval)) | |
1005 | return -EFAULT; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
1009 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) | |
1010 | { | |
1011 | struct pep_sock *pn = pep_sk(sk); | |
1012 | struct pnpipehdr *ph; | |
e1a5964f | 1013 | int err; |
02a47617 | 1014 | |
be677730 RDC |
1015 | if (pn_flow_safe(pn->tx_fc) && |
1016 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { | |
1017 | kfree_skb(skb); | |
1018 | return -ENOBUFS; | |
1019 | } | |
1020 | ||
fea93ece | 1021 | skb_push(skb, 3 + pn->aligned); |
02a47617 RDC |
1022 | skb_reset_transport_header(skb); |
1023 | ph = pnp_hdr(skb); | |
1024 | ph->utid = 0; | |
fea93ece RDC |
1025 | if (pn->aligned) { |
1026 | ph->message_id = PNS_PIPE_ALIGNED_DATA; | |
1027 | ph->data[0] = 0; /* padding */ | |
1028 | } else | |
1029 | ph->message_id = PNS_PIPE_DATA; | |
02a47617 | 1030 | ph->pipe_handle = pn->pipe_handle; |
14ba8fae | 1031 | err = pn_skb_send(sk, skb, NULL); |
e1a5964f RDC |
1032 | |
1033 | if (err && pn_flow_safe(pn->tx_fc)) | |
1034 | atomic_inc(&pn->tx_credits); | |
1035 | return err; | |
1036 | ||
02a47617 RDC |
1037 | } |
1038 | ||
9641458d RDC |
1039 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
1040 | struct msghdr *msg, size_t len) | |
1041 | { | |
1042 | struct pep_sock *pn = pep_sk(sk); | |
b1704374 | 1043 | struct sk_buff *skb; |
9641458d RDC |
1044 | long timeo; |
1045 | int flags = msg->msg_flags; | |
1046 | int err, done; | |
1047 | ||
82ecbcb9 RDC |
1048 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
1049 | MSG_CMSG_COMPAT)) || | |
1050 | !(msg->msg_flags & MSG_EOR)) | |
9641458d RDC |
1051 | return -EOPNOTSUPP; |
1052 | ||
b1704374 RDC |
1053 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
1054 | flags & MSG_DONTWAIT, &err); | |
1055 | if (!skb) | |
02ac3268 | 1056 | return err; |
b1704374 | 1057 | |
638be344 | 1058 | skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned); |
b1704374 RDC |
1059 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
1060 | if (err < 0) | |
1061 | goto outfree; | |
1062 | ||
9641458d RDC |
1063 | lock_sock(sk); |
1064 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); | |
1065 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { | |
1066 | err = -ENOTCONN; | |
1067 | goto out; | |
1068 | } | |
1069 | if (sk->sk_state != TCP_ESTABLISHED) { | |
1070 | /* Wait until the pipe gets to enabled state */ | |
1071 | disabled: | |
1072 | err = sk_stream_wait_connect(sk, &timeo); | |
1073 | if (err) | |
1074 | goto out; | |
1075 | ||
1076 | if (sk->sk_state == TCP_CLOSE_WAIT) { | |
1077 | err = -ECONNRESET; | |
1078 | goto out; | |
1079 | } | |
1080 | } | |
1081 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); | |
1082 | ||
1083 | /* Wait until flow control allows TX */ | |
be677730 | 1084 | done = atomic_read(&pn->tx_credits); |
9641458d RDC |
1085 | while (!done) { |
1086 | DEFINE_WAIT(wait); | |
1087 | ||
1088 | if (!timeo) { | |
1089 | err = -EAGAIN; | |
1090 | goto out; | |
1091 | } | |
1092 | if (signal_pending(current)) { | |
1093 | err = sock_intr_errno(timeo); | |
1094 | goto out; | |
1095 | } | |
1096 | ||
43815482 | 1097 | prepare_to_wait(sk_sleep(sk), &wait, |
9641458d | 1098 | TASK_INTERRUPTIBLE); |
be677730 | 1099 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
43815482 | 1100 | finish_wait(sk_sleep(sk), &wait); |
9641458d RDC |
1101 | |
1102 | if (sk->sk_state != TCP_ESTABLISHED) | |
1103 | goto disabled; | |
1104 | } | |
1105 | ||
02a47617 | 1106 | err = pipe_skb_send(sk, skb); |
9641458d RDC |
1107 | if (err >= 0) |
1108 | err = len; /* success! */ | |
1109 | skb = NULL; | |
1110 | out: | |
1111 | release_sock(sk); | |
b1704374 | 1112 | outfree: |
9641458d RDC |
1113 | kfree_skb(skb); |
1114 | return err; | |
1115 | } | |
1116 | ||
02a47617 RDC |
1117 | int pep_writeable(struct sock *sk) |
1118 | { | |
1119 | struct pep_sock *pn = pep_sk(sk); | |
1120 | ||
be677730 | 1121 | return atomic_read(&pn->tx_credits); |
02a47617 RDC |
1122 | } |
1123 | ||
1124 | int pep_write(struct sock *sk, struct sk_buff *skb) | |
1125 | { | |
1126 | struct sk_buff *rskb, *fs; | |
1127 | int flen = 0; | |
1128 | ||
fea93ece RDC |
1129 | if (pep_sk(sk)->aligned) |
1130 | return pipe_skb_send(sk, skb); | |
1131 | ||
02a47617 RDC |
1132 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
1133 | if (!rskb) { | |
1134 | kfree_skb(skb); | |
1135 | return -ENOMEM; | |
1136 | } | |
1137 | skb_shinfo(rskb)->frag_list = skb; | |
1138 | rskb->len += skb->len; | |
1139 | rskb->data_len += rskb->len; | |
1140 | rskb->truesize += rskb->len; | |
1141 | ||
1142 | /* Avoid nested fragments */ | |
5c313e9a | 1143 | skb_walk_frags(skb, fs) |
02a47617 RDC |
1144 | flen += fs->len; |
1145 | skb->next = skb_shinfo(skb)->frag_list; | |
5c313e9a | 1146 | skb_frag_list_init(skb); |
02a47617 RDC |
1147 | skb->len -= flen; |
1148 | skb->data_len -= flen; | |
1149 | skb->truesize -= flen; | |
1150 | ||
1151 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); | |
1152 | return pipe_skb_send(sk, rskb); | |
1153 | } | |
1154 | ||
1155 | struct sk_buff *pep_read(struct sock *sk) | |
1156 | { | |
1157 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); | |
1158 | ||
1159 | if (sk->sk_state == TCP_ESTABLISHED) | |
44c9ab16 | 1160 | pipe_grant_credits(sk, GFP_ATOMIC); |
02a47617 RDC |
1161 | return skb; |
1162 | } | |
1163 | ||
9641458d RDC |
1164 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
1165 | struct msghdr *msg, size_t len, int noblock, | |
1166 | int flags, int *addr_len) | |
1167 | { | |
1168 | struct sk_buff *skb; | |
1169 | int err; | |
1170 | ||
82ecbcb9 RDC |
1171 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
1172 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) | |
1173 | return -EOPNOTSUPP; | |
1174 | ||
9641458d RDC |
1175 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
1176 | return -ENOTCONN; | |
1177 | ||
c41bd97f RDC |
1178 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
1179 | /* Dequeue and acknowledge control request */ | |
1180 | struct pep_sock *pn = pep_sk(sk); | |
1181 | ||
82ecbcb9 RDC |
1182 | if (flags & MSG_PEEK) |
1183 | return -EOPNOTSUPP; | |
c41bd97f RDC |
1184 | skb = skb_dequeue(&pn->ctrlreq_queue); |
1185 | if (skb) { | |
1186 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, | |
1187 | GFP_KERNEL); | |
1188 | msg->msg_flags |= MSG_OOB; | |
1189 | goto copy; | |
1190 | } | |
1191 | if (flags & MSG_OOB) | |
1192 | return -EINVAL; | |
1193 | } | |
1194 | ||
9641458d RDC |
1195 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
1196 | lock_sock(sk); | |
1197 | if (skb == NULL) { | |
1198 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) | |
1199 | err = -ECONNRESET; | |
1200 | release_sock(sk); | |
1201 | return err; | |
1202 | } | |
1203 | ||
1204 | if (sk->sk_state == TCP_ESTABLISHED) | |
44c9ab16 | 1205 | pipe_grant_credits(sk, GFP_KERNEL); |
9641458d | 1206 | release_sock(sk); |
c41bd97f | 1207 | copy: |
9641458d | 1208 | msg->msg_flags |= MSG_EOR; |
9641458d RDC |
1209 | if (skb->len > len) |
1210 | msg->msg_flags |= MSG_TRUNC; | |
1211 | else | |
1212 | len = skb->len; | |
1213 | ||
1214 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); | |
1215 | if (!err) | |
1216 | err = (flags & MSG_TRUNC) ? skb->len : len; | |
1217 | ||
1218 | skb_free_datagram(sk, skb); | |
1219 | return err; | |
1220 | } | |
1221 | ||
1222 | static void pep_sock_unhash(struct sock *sk) | |
1223 | { | |
1224 | struct pep_sock *pn = pep_sk(sk); | |
1225 | struct sock *skparent = NULL; | |
1226 | ||
1227 | lock_sock(sk); | |
b3d62553 | 1228 | |
297edb60 | 1229 | if (pn->listener != NULL) { |
9641458d | 1230 | skparent = pn->listener; |
297edb60 | 1231 | pn->listener = NULL; |
9641458d RDC |
1232 | release_sock(sk); |
1233 | ||
9641458d | 1234 | pn = pep_sk(skparent); |
7dfde179 RDC |
1235 | lock_sock(skparent); |
1236 | sk_del_node_init(sk); | |
1237 | sk = skparent; | |
9641458d | 1238 | } |
297edb60 | 1239 | |
9641458d RDC |
1240 | /* Unhash a listening sock only when it is closed |
1241 | * and all of its active connected pipes are closed. */ | |
1242 | if (hlist_empty(&pn->hlist)) | |
1243 | pn_sock_unhash(&pn->pn_sk.sk); | |
1244 | release_sock(sk); | |
1245 | ||
1246 | if (skparent) | |
1247 | sock_put(skparent); | |
1248 | } | |
1249 | ||
1250 | static struct proto pep_proto = { | |
1251 | .close = pep_sock_close, | |
1252 | .accept = pep_sock_accept, | |
b3d62553 | 1253 | .connect = pep_sock_connect, |
9641458d RDC |
1254 | .ioctl = pep_ioctl, |
1255 | .init = pep_init, | |
02a47617 RDC |
1256 | .setsockopt = pep_setsockopt, |
1257 | .getsockopt = pep_getsockopt, | |
9641458d RDC |
1258 | .sendmsg = pep_sendmsg, |
1259 | .recvmsg = pep_recvmsg, | |
1260 | .backlog_rcv = pep_do_rcv, | |
1261 | .hash = pn_sock_hash, | |
1262 | .unhash = pep_sock_unhash, | |
1263 | .get_port = pn_sock_get_port, | |
1264 | .obj_size = sizeof(struct pep_sock), | |
1265 | .owner = THIS_MODULE, | |
1266 | .name = "PNPIPE", | |
1267 | }; | |
1268 | ||
1269 | static struct phonet_protocol pep_pn_proto = { | |
1270 | .ops = &phonet_stream_ops, | |
1271 | .prot = &pep_proto, | |
1272 | .sock_type = SOCK_SEQPACKET, | |
1273 | }; | |
1274 | ||
1275 | static int __init pep_register(void) | |
1276 | { | |
1277 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); | |
1278 | } | |
1279 | ||
1280 | static void __exit pep_unregister(void) | |
1281 | { | |
1282 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); | |
1283 | } | |
1284 | ||
1285 | module_init(pep_register); | |
1286 | module_exit(pep_unregister); | |
1287 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); | |
1288 | MODULE_DESCRIPTION("Phonet pipe protocol"); | |
1289 | MODULE_LICENSE("GPL"); | |
1290 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |