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Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001/*
2 * File: pep.c
3 *
4 * Phonet pipe protocol end point socket
5 *
6 * Copyright (C) 2008 Nokia Corporation.
7 *
Rémi Denis-Courmont31fdc552012-06-13 22:29:03 +00008 * Author: Rémi Denis-Courmont
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07009 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090026#include <linux/slab.h>
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070027#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>
Paul Gortmaker3a9a2312011-05-27 09:12:25 -040033#include <linux/module.h>
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070034#include <net/phonet/phonet.h>
35#include <net/phonet/pep.h>
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -070036#include <net/phonet/gprs.h>
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070037
38/* sk_state values:
39 * TCP_CLOSE sock not in use yet
40 * TCP_CLOSE_WAIT disconnected pipe
41 * TCP_LISTEN listening pipe endpoint
42 * TCP_SYN_RECV connected pipe in disabled state
43 * TCP_ESTABLISHED connected pipe in enabled state
44 *
45 * pep_sock locking:
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +000046 * - sk_state, hlist: sock lock needed
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070047 * - listener: read only
48 * - pipe_handle: read only
49 */
50
51#define CREDITS_MAX 10
52#define CREDITS_THR 7
53
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070054#define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */
55
56/* Get the next TLV sub-block. */
57static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
58 void *buf)
59{
60 void *data = NULL;
61 struct {
62 u8 sb_type;
63 u8 sb_len;
64 } *ph, h;
65 int buflen = *plen;
66
67 ph = skb_header_pointer(skb, 0, 2, &h);
68 if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len))
69 return NULL;
70 ph->sb_len -= 2;
71 *ptype = ph->sb_type;
72 *plen = ph->sb_len;
73
74 if (buflen > ph->sb_len)
75 buflen = ph->sb_len;
76 data = skb_header_pointer(skb, 2, buflen, buf);
77 __skb_pull(skb, 2 + ph->sb_len);
78 return data;
79}
80
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +000081static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
82 int len, gfp_t priority)
83{
84 struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
85 if (!skb)
86 return NULL;
87 skb_set_owner_w(skb, sk);
88
89 skb_reserve(skb, MAX_PNPIPE_HEADER);
90 __skb_put(skb, len);
91 skb_copy_to_linear_data(skb, payload, len);
92 __skb_push(skb, sizeof(struct pnpipehdr));
93 skb_reset_transport_header(skb);
94 return skb;
95}
96
97static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code,
98 const void *data, int len, gfp_t priority)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -070099{
100 const struct pnpipehdr *oph = pnp_hdr(oskb);
101 struct pnpipehdr *ph;
102 struct sk_buff *skb;
Rémi Denis-Courmont14ba8fa2011-02-24 23:14:58 +0000103 struct sockaddr_pn peer;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700104
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000105 skb = pep_alloc_skb(sk, data, len, priority);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700106 if (!skb)
107 return -ENOMEM;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700108
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700109 ph = pnp_hdr(skb);
110 ph->utid = oph->utid;
111 ph->message_id = oph->message_id + 1; /* REQ -> RESP */
112 ph->pipe_handle = oph->pipe_handle;
113 ph->error_code = code;
114
Rémi Denis-Courmont14ba8fa2011-02-24 23:14:58 +0000115 pn_skb_get_src_sockaddr(oskb, &peer);
116 return pn_skb_send(sk, skb, &peer);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700117}
118
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000119static int pep_indicate(struct sock *sk, u8 id, u8 code,
120 const void *data, int len, gfp_t priority)
121{
122 struct pep_sock *pn = pep_sk(sk);
123 struct pnpipehdr *ph;
124 struct sk_buff *skb;
125
126 skb = pep_alloc_skb(sk, data, len, priority);
127 if (!skb)
128 return -ENOMEM;
129
130 ph = pnp_hdr(skb);
131 ph->utid = 0;
132 ph->message_id = id;
133 ph->pipe_handle = pn->pipe_handle;
134 ph->data[0] = code;
135 return pn_skb_send(sk, skb, NULL);
136}
137
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700138#define PAD 0x00
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000139
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000140static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
141 const void *data, int len)
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000142{
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000143 struct pep_sock *pn = pep_sk(sk);
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000144 struct pnpipehdr *ph;
145 struct sk_buff *skb;
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000146
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000147 skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000148 if (!skb)
149 return -ENOMEM;
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000150
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000151 ph = pnp_hdr(skb);
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000152 ph->utid = id; /* whatever */
153 ph->message_id = id;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000154 ph->pipe_handle = pn->pipe_handle;
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000155 ph->data[0] = code;
Rémi Denis-Courmont14ba8fa2011-02-24 23:14:58 +0000156 return pn_skb_send(sk, skb, NULL);
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000157}
158
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000159static int pipe_handler_send_created_ind(struct sock *sk)
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000160{
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000161 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000162 u8 data[4] = {
163 PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
164 pn->tx_fc, pn->rx_fc,
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000165 };
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000166
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000167 return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
168 data, 4, GFP_ATOMIC);
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +0000169}
170
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700171static int pep_accept_conn(struct sock *sk, struct sk_buff *skb)
172{
173 static const u8 data[20] = {
174 PAD, PAD, PAD, 2 /* sub-blocks */,
175 PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD,
176 PN_MULTI_CREDIT_FLOW_CONTROL,
177 PN_ONE_CREDIT_FLOW_CONTROL,
178 PN_LEGACY_FLOW_CONTROL,
179 PAD,
180 PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD,
181 PN_MULTI_CREDIT_FLOW_CONTROL,
182 PN_ONE_CREDIT_FLOW_CONTROL,
183 PN_LEGACY_FLOW_CONTROL,
184 PAD,
185 };
186
187 might_sleep();
188 return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data),
189 GFP_KERNEL);
190}
191
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000192static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code,
193 gfp_t priority)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700194{
195 static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ };
196 WARN_ON(code == PN_PIPE_NO_ERROR);
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000197 return pep_reply(sk, skb, code, data, sizeof(data), priority);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700198}
199
200/* Control requests are not sent by the pipe service and have a specific
201 * message format. */
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700202static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
203 gfp_t priority)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700204{
205 const struct pnpipehdr *oph = pnp_hdr(oskb);
206 struct sk_buff *skb;
207 struct pnpipehdr *ph;
208 struct sockaddr_pn dst;
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000209 u8 data[4] = {
210 oph->data[0], /* PEP type */
211 code, /* error code, at an unusual offset */
212 PAD, PAD,
213 };
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700214
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000215 skb = pep_alloc_skb(sk, data, 4, priority);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700216 if (!skb)
217 return -ENOMEM;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700218
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000219 ph = pnp_hdr(skb);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700220 ph->utid = oph->utid;
221 ph->message_id = PNS_PEP_CTRL_RESP;
222 ph->pipe_handle = oph->pipe_handle;
223 ph->data[0] = oph->data[1]; /* CTRL id */
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700224
225 pn_skb_get_src_sockaddr(oskb, &dst);
226 return pn_skb_send(sk, skb, &dst);
227}
228
229static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
230{
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000231 u8 data[4] = { type, PAD, PAD, status };
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700232
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000233 return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
234 data, 4, priority);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700235}
236
237/* Send our RX flow control information to the sender.
238 * Socket must be locked. */
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000239static void pipe_grant_credits(struct sock *sk, gfp_t priority)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700240{
241 struct pep_sock *pn = pep_sk(sk);
242
243 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
244
245 switch (pn->rx_fc) {
246 case PN_LEGACY_FLOW_CONTROL: /* TODO */
247 break;
248 case PN_ONE_CREDIT_FLOW_CONTROL:
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000249 if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
250 PEP_IND_READY, priority) == 0)
251 pn->rx_credits = 1;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700252 break;
253 case PN_MULTI_CREDIT_FLOW_CONTROL:
254 if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX)
255 break;
256 if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
257 CREDITS_MAX - pn->rx_credits,
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000258 priority) == 0)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700259 pn->rx_credits = CREDITS_MAX;
260 break;
261 }
262}
263
264static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb)
265{
266 struct pep_sock *pn = pep_sk(sk);
Kumar Sanghvia91e7d42010-09-27 23:10:42 +0000267 struct pnpipehdr *hdr;
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800268 int wake = 0;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700269
270 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
271 return -EINVAL;
272
Kumar Sanghvia91e7d42010-09-27 23:10:42 +0000273 hdr = pnp_hdr(skb);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700274 if (hdr->data[0] != PN_PEP_TYPE_COMMON) {
275 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000276 (unsigned int)hdr->data[0]);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700277 return -EOPNOTSUPP;
278 }
279
280 switch (hdr->data[1]) {
281 case PN_PEP_IND_FLOW_CONTROL:
282 switch (pn->tx_fc) {
283 case PN_LEGACY_FLOW_CONTROL:
284 switch (hdr->data[4]) {
285 case PEP_IND_BUSY:
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800286 atomic_set(&pn->tx_credits, 0);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700287 break;
288 case PEP_IND_READY:
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800289 atomic_set(&pn->tx_credits, wake = 1);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700290 break;
291 }
292 break;
293 case PN_ONE_CREDIT_FLOW_CONTROL:
294 if (hdr->data[4] == PEP_IND_READY)
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800295 atomic_set(&pn->tx_credits, wake = 1);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700296 break;
297 }
298 break;
299
300 case PN_PEP_IND_ID_MCFC_GRANT_CREDITS:
301 if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL)
302 break;
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800303 atomic_add(wake = hdr->data[4], &pn->tx_credits);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700304 break;
305
306 default:
307 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n",
Eric Dumazet95c96172012-04-15 05:58:06 +0000308 (unsigned int)hdr->data[1]);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700309 return -EOPNOTSUPP;
310 }
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800311 if (wake)
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700312 sk->sk_write_space(sk);
313 return 0;
314}
315
316static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb)
317{
318 struct pep_sock *pn = pep_sk(sk);
319 struct pnpipehdr *hdr = pnp_hdr(skb);
320 u8 n_sb = hdr->data[0];
321
322 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
323 __skb_pull(skb, sizeof(*hdr));
324 while (n_sb > 0) {
325 u8 type, buf[2], len = sizeof(buf);
326 u8 *data = pep_get_sb(skb, &type, &len, buf);
327
328 if (data == NULL)
329 return -EINVAL;
330 switch (type) {
331 case PN_PIPE_SB_NEGOTIATED_FC:
332 if (len < 2 || (data[0] | data[1]) > 3)
333 break;
334 pn->tx_fc = data[0] & 3;
335 pn->rx_fc = data[1] & 3;
336 break;
337 }
338 n_sb--;
339 }
340 return 0;
341}
342
343/* Queue an skb to a connected sock.
344 * Socket lock must be held. */
345static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
346{
347 struct pep_sock *pn = pep_sk(sk);
348 struct pnpipehdr *hdr = pnp_hdr(skb);
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700349 struct sk_buff_head *queue;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700350 int err = 0;
351
352 BUG_ON(sk->sk_state == TCP_CLOSE_WAIT);
353
354 switch (hdr->message_id) {
355 case PNS_PEP_CONNECT_REQ:
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000356 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_ATOMIC);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700357 break;
358
359 case PNS_PEP_DISCONNECT_REQ:
360 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
361 sk->sk_state = TCP_CLOSE_WAIT;
362 if (!sock_flag(sk, SOCK_DEAD))
363 sk->sk_state_change(sk);
364 break;
365
366 case PNS_PEP_ENABLE_REQ:
367 /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */
368 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
369 break;
370
371 case PNS_PEP_RESET_REQ:
372 switch (hdr->state_after_reset) {
373 case PN_PIPE_DISABLE:
374 pn->init_enable = 0;
375 break;
376 case PN_PIPE_ENABLE:
377 pn->init_enable = 1;
378 break;
379 default: /* not allowed to send an error here!? */
380 err = -EINVAL;
381 goto out;
382 }
383 /* fall through */
384 case PNS_PEP_DISABLE_REQ:
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800385 atomic_set(&pn->tx_credits, 0);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700386 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
387 break;
388
389 case PNS_PEP_CTRL_REQ:
Rémi Denis-Courmont2e2fb4b2009-07-21 01:57:59 +0000390 if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) {
391 atomic_inc(&sk->sk_drops);
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700392 break;
Rémi Denis-Courmont2e2fb4b2009-07-21 01:57:59 +0000393 }
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700394 __skb_pull(skb, 4);
395 queue = &pn->ctrlreq_queue;
396 goto queue;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700397
Rémi Denis-Courmontfc6a1102010-01-04 02:02:47 +0000398 case PNS_PIPE_ALIGNED_DATA:
399 __skb_pull(skb, 1);
400 /* fall through */
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700401 case PNS_PIPE_DATA:
402 __skb_pull(skb, 3); /* Pipe data header */
403 if (!pn_flow_safe(pn->rx_fc)) {
404 err = sock_queue_rcv_skb(sk, skb);
405 if (!err)
Rémi Denis-Courmont0ebbf312011-03-08 22:44:08 +0000406 return NET_RX_SUCCESS;
407 err = -ENOBUFS;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700408 break;
409 }
410
411 if (pn->rx_credits == 0) {
Rémi Denis-Courmont2e2fb4b2009-07-21 01:57:59 +0000412 atomic_inc(&sk->sk_drops);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700413 err = -ENOBUFS;
414 break;
415 }
416 pn->rx_credits--;
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700417 queue = &sk->sk_receive_queue;
418 goto queue;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700419
420 case PNS_PEP_STATUS_IND:
421 pipe_rcv_status(sk, skb);
422 break;
423
424 case PNS_PIPE_REDIRECTED_IND:
425 err = pipe_rcv_created(sk, skb);
426 break;
427
428 case PNS_PIPE_CREATED_IND:
429 err = pipe_rcv_created(sk, skb);
430 if (err)
431 break;
432 /* fall through */
433 case PNS_PIPE_RESET_IND:
434 if (!pn->init_enable)
435 break;
436 /* fall through */
437 case PNS_PIPE_ENABLED_IND:
438 if (!pn_flow_safe(pn->tx_fc)) {
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -0800439 atomic_set(&pn->tx_credits, 1);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700440 sk->sk_write_space(sk);
441 }
442 if (sk->sk_state == TCP_ESTABLISHED)
443 break; /* Nothing to do */
444 sk->sk_state = TCP_ESTABLISHED;
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000445 pipe_grant_credits(sk, GFP_ATOMIC);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700446 break;
447
448 case PNS_PIPE_DISABLED_IND:
449 sk->sk_state = TCP_SYN_RECV;
450 pn->rx_credits = 0;
451 break;
452
453 default:
454 LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n",
455 hdr->message_id);
456 err = -EINVAL;
457 }
458out:
459 kfree_skb(skb);
Rémi Denis-Courmont0ebbf312011-03-08 22:44:08 +0000460 return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS;
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700461
462queue:
463 skb->dev = NULL;
464 skb_set_owner_r(skb, sk);
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700465 skb_queue_tail(queue, skb);
466 if (!sock_flag(sk, SOCK_DEAD))
David S. Miller676d2362014-04-11 16:15:36 -0400467 sk->sk_data_ready(sk);
Rémi Denis-Courmont0ebbf312011-03-08 22:44:08 +0000468 return NET_RX_SUCCESS;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700469}
470
471/* Destroy connected sock. */
472static void pipe_destruct(struct sock *sk)
473{
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700474 struct pep_sock *pn = pep_sk(sk);
475
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700476 skb_queue_purge(&sk->sk_receive_queue);
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700477 skb_queue_purge(&pn->ctrlreq_queue);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700478}
479
Eric Dumazet95c96172012-04-15 05:58:06 +0000480static u8 pipe_negotiate_fc(const u8 *fcs, unsigned int n)
Rémi Denis-Courmont8f44fcc2011-02-24 23:15:01 +0000481{
Eric Dumazet95c96172012-04-15 05:58:06 +0000482 unsigned int i;
Rémi Denis-Courmont8f44fcc2011-02-24 23:15:01 +0000483 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
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000494static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
495{
496 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmont8f44fcc2011-02-24 23:15:01 +0000497 struct pnpipehdr *hdr;
498 u8 n_sb;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000499
Rémi Denis-Courmont8f44fcc2011-02-24 23:15:01 +0000500 if (!pskb_pull(skb, sizeof(*hdr) + 4))
501 return -EINVAL;
502
503 hdr = pnp_hdr(skb);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000504 if (hdr->error_code != PN_PIPE_NO_ERROR)
505 return -ECONNREFUSED;
Rémi Denis-Courmont8f44fcc2011-02-24 23:15:01 +0000506
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 }
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000532
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000533 return pipe_handler_send_created_ind(sk);
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000534}
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000535
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000536static int pep_enableresp_rcv(struct sock *sk, struct sk_buff *skb)
537{
538 struct pnpipehdr *hdr = pnp_hdr(skb);
539
540 if (hdr->error_code != PN_PIPE_NO_ERROR)
541 return -ECONNREFUSED;
542
543 return pep_indicate(sk, PNS_PIPE_ENABLED_IND, 0 /* sub-blocks */,
544 NULL, 0, GFP_ATOMIC);
545
546}
547
548static void pipe_start_flow_control(struct sock *sk)
549{
550 struct pep_sock *pn = pep_sk(sk);
551
552 if (!pn_flow_safe(pn->tx_fc)) {
553 atomic_set(&pn->tx_credits, 1);
554 sk->sk_write_space(sk);
555 }
556 pipe_grant_credits(sk, GFP_ATOMIC);
557}
558
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000559/* Queue an skb to an actively connected sock.
560 * Socket lock must be held. */
561static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb)
562{
563 struct pep_sock *pn = pep_sk(sk);
564 struct pnpipehdr *hdr = pnp_hdr(skb);
565 int err = NET_RX_SUCCESS;
566
567 switch (hdr->message_id) {
568 case PNS_PIPE_ALIGNED_DATA:
569 __skb_pull(skb, 1);
570 /* fall through */
571 case PNS_PIPE_DATA:
572 __skb_pull(skb, 3); /* Pipe data header */
573 if (!pn_flow_safe(pn->rx_fc)) {
574 err = sock_queue_rcv_skb(sk, skb);
575 if (!err)
576 return NET_RX_SUCCESS;
577 err = NET_RX_DROP;
578 break;
579 }
580
581 if (pn->rx_credits == 0) {
582 atomic_inc(&sk->sk_drops);
583 err = NET_RX_DROP;
584 break;
585 }
586 pn->rx_credits--;
587 skb->dev = NULL;
588 skb_set_owner_r(skb, sk);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000589 skb_queue_tail(&sk->sk_receive_queue, skb);
590 if (!sock_flag(sk, SOCK_DEAD))
David S. Miller676d2362014-04-11 16:15:36 -0400591 sk->sk_data_ready(sk);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000592 return NET_RX_SUCCESS;
593
594 case PNS_PEP_CONNECT_RESP:
595 if (sk->sk_state != TCP_SYN_SENT)
596 break;
597 if (!sock_flag(sk, SOCK_DEAD))
598 sk->sk_state_change(sk);
599 if (pep_connresp_rcv(sk, skb)) {
600 sk->sk_state = TCP_CLOSE_WAIT;
601 break;
602 }
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000603 if (pn->init_enable == PN_PIPE_DISABLE)
604 sk->sk_state = TCP_SYN_RECV;
605 else {
606 sk->sk_state = TCP_ESTABLISHED;
607 pipe_start_flow_control(sk);
608 }
609 break;
610
611 case PNS_PEP_ENABLE_RESP:
612 if (sk->sk_state != TCP_SYN_SENT)
613 break;
614
615 if (pep_enableresp_rcv(sk, skb)) {
616 sk->sk_state = TCP_CLOSE_WAIT;
617 break;
618 }
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000619
620 sk->sk_state = TCP_ESTABLISHED;
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000621 pipe_start_flow_control(sk);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000622 break;
623
624 case PNS_PEP_DISCONNECT_RESP:
625 /* sock should already be dead, nothing to do */
626 break;
627
628 case PNS_PEP_STATUS_IND:
629 pipe_rcv_status(sk, skb);
630 break;
631 }
632 kfree_skb(skb);
633 return err;
634}
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000635
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700636/* Listening sock must be locked */
637static struct sock *pep_find_pipe(const struct hlist_head *hlist,
638 const struct sockaddr_pn *dst,
639 u8 pipe_handle)
640{
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700641 struct sock *sknode;
642 u16 dobj = pn_sockaddr_get_object(dst);
643
Sasha Levinb67bfe02013-02-27 17:06:00 -0800644 sk_for_each(sknode, hlist) {
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700645 struct pep_sock *pnnode = pep_sk(sknode);
646
647 /* Ports match, but addresses might not: */
648 if (pnnode->pn_sk.sobject != dobj)
649 continue;
650 if (pnnode->pipe_handle != pipe_handle)
651 continue;
652 if (sknode->sk_state == TCP_CLOSE_WAIT)
653 continue;
654
655 sock_hold(sknode);
656 return sknode;
657 }
658 return NULL;
659}
660
661/*
662 * Deliver an skb to a listening sock.
663 * Socket lock must be held.
664 * We then queue the skb to the right connected sock (if any).
665 */
666static int pep_do_rcv(struct sock *sk, struct sk_buff *skb)
667{
668 struct pep_sock *pn = pep_sk(sk);
669 struct sock *sknode;
Rémi Denis-Courmont2ddc1ac2009-02-10 17:14:50 -0800670 struct pnpipehdr *hdr;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700671 struct sockaddr_pn dst;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700672 u8 pipe_handle;
673
674 if (!pskb_may_pull(skb, sizeof(*hdr)))
675 goto drop;
676
677 hdr = pnp_hdr(skb);
678 pipe_handle = hdr->pipe_handle;
679 if (pipe_handle == PN_PIPE_INVALID_HANDLE)
680 goto drop;
681
682 pn_skb_get_dst_sockaddr(skb, &dst);
683
684 /* Look for an existing pipe handle */
685 sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
686 if (sknode)
687 return sk_receive_skb(sknode, skb, 1);
688
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700689 switch (hdr->message_id) {
690 case PNS_PEP_CONNECT_REQ:
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000691 if (sk->sk_state != TCP_LISTEN || sk_acceptq_is_full(sk)) {
692 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE,
693 GFP_ATOMIC);
694 break;
695 }
696 skb_queue_head(&sk->sk_receive_queue, skb);
697 sk_acceptq_added(sk);
698 if (!sock_flag(sk, SOCK_DEAD))
David S. Miller676d2362014-04-11 16:15:36 -0400699 sk->sk_data_ready(sk);
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000700 return NET_RX_SUCCESS;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700701
702 case PNS_PEP_DISCONNECT_REQ:
703 pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC);
704 break;
705
706 case PNS_PEP_CTRL_REQ:
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700707 pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700708 break;
709
710 case PNS_PEP_RESET_REQ:
711 case PNS_PEP_ENABLE_REQ:
712 case PNS_PEP_DISABLE_REQ:
713 /* invalid handle is not even allowed here! */
Rémi Denis-Courmont0ebbf312011-03-08 22:44:08 +0000714 break;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000715
716 default:
717 if ((1 << sk->sk_state)
718 & ~(TCPF_CLOSE|TCPF_LISTEN|TCPF_CLOSE_WAIT))
719 /* actively connected socket */
720 return pipe_handler_do_rcv(sk, skb);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700721 }
722drop:
723 kfree_skb(skb);
Rémi Denis-Courmont0ebbf312011-03-08 22:44:08 +0000724 return NET_RX_SUCCESS;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700725}
726
Rémi Denis-Courmont6482f552010-09-15 12:19:53 +0000727static int pipe_do_remove(struct sock *sk)
728{
729 struct pep_sock *pn = pep_sk(sk);
730 struct pnpipehdr *ph;
731 struct sk_buff *skb;
732
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000733 skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
Rémi Denis-Courmont6482f552010-09-15 12:19:53 +0000734 if (!skb)
735 return -ENOMEM;
736
Rémi Denis-Courmont6482f552010-09-15 12:19:53 +0000737 ph = pnp_hdr(skb);
738 ph->utid = 0;
739 ph->message_id = PNS_PIPE_REMOVE_REQ;
740 ph->pipe_handle = pn->pipe_handle;
741 ph->data[0] = PAD;
Rémi Denis-Courmont14ba8fa2011-02-24 23:14:58 +0000742 return pn_skb_send(sk, skb, NULL);
Rémi Denis-Courmont6482f552010-09-15 12:19:53 +0000743}
744
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700745/* associated socket ceases to exist */
746static void pep_sock_close(struct sock *sk, long timeout)
747{
748 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700749 int ifindex = 0;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700750
Rémi Denis-Courmonte5134802010-05-25 16:08:39 -0700751 sock_hold(sk); /* keep a reference after sk_common_release() */
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700752 sk_common_release(sk);
753
754 lock_sock(sk);
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000755 if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) {
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000756 if (sk->sk_backlog_rcv == pipe_do_rcv)
757 /* Forcefully remove dangling Phonet pipe */
758 pipe_do_remove(sk);
759 else
760 pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD,
761 NULL, 0);
Rémi Denis-Courmont2feb6182011-02-24 23:14:59 +0000762 }
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000763 sk->sk_state = TCP_CLOSE;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000764
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700765 ifindex = pn->ifindex;
766 pn->ifindex = 0;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700767 release_sock(sk);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700768
769 if (ifindex)
770 gprs_detach(sk);
Rémi Denis-Courmonte5134802010-05-25 16:08:39 -0700771 sock_put(sk);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700772}
773
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700774static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp)
775{
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000776 struct pep_sock *pn = pep_sk(sk), *newpn;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700777 struct sock *newsk = NULL;
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000778 struct sk_buff *skb;
779 struct pnpipehdr *hdr;
780 struct sockaddr_pn dst, src;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700781 int err;
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000782 u16 peer_type;
783 u8 pipe_handle, enabled, n_sb;
784 u8 aligned = 0;
785
786 skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp);
787 if (!skb)
788 return NULL;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700789
790 lock_sock(sk);
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000791 if (sk->sk_state != TCP_LISTEN) {
792 err = -EINVAL;
793 goto drop;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700794 }
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700795 sk_acceptq_removed(sk);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700796
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000797 err = -EPROTO;
798 if (!pskb_may_pull(skb, sizeof(*hdr) + 4))
799 goto drop;
800
801 hdr = pnp_hdr(skb);
802 pipe_handle = hdr->pipe_handle;
803 switch (hdr->state_after_connect) {
804 case PN_PIPE_DISABLE:
805 enabled = 0;
806 break;
807 case PN_PIPE_ENABLE:
808 enabled = 1;
809 break;
810 default:
811 pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM,
812 GFP_KERNEL);
813 goto drop;
814 }
815 peer_type = hdr->other_pep_type << 8;
816
817 /* Parse sub-blocks (options) */
818 n_sb = hdr->data[4];
819 while (n_sb > 0) {
820 u8 type, buf[1], len = sizeof(buf);
821 const u8 *data = pep_get_sb(skb, &type, &len, buf);
822
823 if (data == NULL)
824 goto drop;
825 switch (type) {
826 case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE:
827 if (len < 1)
828 goto drop;
829 peer_type = (peer_type & 0xff00) | data[0];
830 break;
831 case PN_PIPE_SB_ALIGNED_DATA:
832 aligned = data[0] != 0;
833 break;
834 }
835 n_sb--;
836 }
837
838 /* Check for duplicate pipe handle */
839 newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle);
840 if (unlikely(newsk)) {
841 __sock_put(newsk);
842 newsk = NULL;
843 pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL);
844 goto drop;
845 }
846
847 /* Create a new to-be-accepted sock */
848 newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot);
849 if (!newsk) {
850 pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL);
851 err = -ENOBUFS;
852 goto drop;
853 }
854
855 sock_init_data(NULL, newsk);
856 newsk->sk_state = TCP_SYN_RECV;
857 newsk->sk_backlog_rcv = pipe_do_rcv;
858 newsk->sk_protocol = sk->sk_protocol;
859 newsk->sk_destruct = pipe_destruct;
860
861 newpn = pep_sk(newsk);
862 pn_skb_get_dst_sockaddr(skb, &dst);
863 pn_skb_get_src_sockaddr(skb, &src);
864 newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst);
865 newpn->pn_sk.dobject = pn_sockaddr_get_object(&src);
866 newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst);
867 sock_hold(sk);
868 newpn->listener = sk;
869 skb_queue_head_init(&newpn->ctrlreq_queue);
870 newpn->pipe_handle = pipe_handle;
871 atomic_set(&newpn->tx_credits, 0);
872 newpn->ifindex = 0;
873 newpn->peer_type = peer_type;
874 newpn->rx_credits = 0;
875 newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL;
876 newpn->init_enable = enabled;
877 newpn->aligned = aligned;
878
879 err = pep_accept_conn(newsk, skb);
880 if (err) {
881 sock_put(newsk);
882 newsk = NULL;
883 goto drop;
884 }
885 sk_add_node(newsk, &pn->hlist);
886drop:
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700887 release_sock(sk);
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000888 kfree_skb(skb);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700889 *errp = err;
890 return newsk;
891}
892
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000893static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
894{
895 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000896 int err;
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +0000897 u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD };
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000898
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000899 if (pn->pipe_handle == PN_PIPE_INVALID_HANDLE)
900 pn->pipe_handle = 1; /* anything but INVALID_HANDLE */
901
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000902 err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ,
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000903 pn->init_enable, data, 4);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000904 if (err) {
905 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
906 return err;
907 }
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000908
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000909 sk->sk_state = TCP_SYN_SENT;
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000910
911 return 0;
912}
913
914static int pep_sock_enable(struct sock *sk, struct sockaddr *addr, int len)
915{
916 int err;
917
918 err = pipe_handler_request(sk, PNS_PEP_ENABLE_REQ, PAD,
919 NULL, 0);
920 if (err)
921 return err;
922
923 sk->sk_state = TCP_SYN_SENT;
924
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000925 return 0;
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000926}
Kumar Sanghvib3d62552010-10-12 20:14:43 +0000927
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700928static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg)
929{
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700930 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700931 int answ;
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000932 int ret = -ENOIOCTLCMD;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700933
934 switch (cmd) {
935 case SIOCINQ:
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000936 if (sk->sk_state == TCP_LISTEN) {
937 ret = -EINVAL;
938 break;
939 }
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700940
941 lock_sock(sk);
Joe Perchesf64f9e72009-11-29 16:55:45 -0800942 if (sock_flag(sk, SOCK_URGINLINE) &&
943 !skb_queue_empty(&pn->ctrlreq_queue))
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700944 answ = skb_peek(&pn->ctrlreq_queue)->len;
945 else if (!skb_queue_empty(&sk->sk_receive_queue))
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700946 answ = skb_peek(&sk->sk_receive_queue)->len;
947 else
948 answ = 0;
949 release_sock(sk);
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000950 ret = put_user(answ, (int __user *)arg);
951 break;
952
953 case SIOCPNENABLEPIPE:
954 lock_sock(sk);
955 if (sk->sk_state == TCP_SYN_SENT)
956 ret = -EBUSY;
957 else if (sk->sk_state == TCP_ESTABLISHED)
958 ret = -EISCONN;
959 else
960 ret = pep_sock_enable(sk, NULL, 0);
961 release_sock(sk);
962 break;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700963 }
964
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +0000965 return ret;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700966}
967
968static int pep_init(struct sock *sk)
969{
970 struct pep_sock *pn = pep_sk(sk);
971
Rémi Denis-Courmontf7ae8d52011-03-08 22:44:10 +0000972 sk->sk_destruct = pipe_destruct;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700973 INIT_HLIST_HEAD(&pn->hlist);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000974 pn->listener = NULL;
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -0700975 skb_queue_head_init(&pn->ctrlreq_queue);
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000976 atomic_set(&pn->tx_credits, 0);
977 pn->ifindex = 0;
978 pn->peer_type = 0;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700979 pn->pipe_handle = PN_PIPE_INVALID_HANDLE;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +0000980 pn->rx_credits = 0;
981 pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL;
982 pn->init_enable = 1;
983 pn->aligned = 0;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -0700984 return 0;
985}
986
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700987static int pep_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700988 char __user *optval, unsigned int optlen)
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -0700989{
990 struct pep_sock *pn = pep_sk(sk);
991 int val = 0, err = 0;
992
993 if (level != SOL_PNPIPE)
994 return -ENOPROTOOPT;
995 if (optlen >= sizeof(int)) {
996 if (get_user(val, (int __user *) optval))
997 return -EFAULT;
998 }
999
1000 lock_sock(sk);
1001 switch (optname) {
1002 case PNPIPE_ENCAP:
1003 if (val && val != PNPIPE_ENCAP_IP) {
1004 err = -EINVAL;
1005 break;
1006 }
1007 if (!pn->ifindex == !val)
1008 break; /* Nothing to do! */
1009 if (!capable(CAP_NET_ADMIN)) {
1010 err = -EPERM;
1011 break;
1012 }
1013 if (val) {
1014 release_sock(sk);
1015 err = gprs_attach(sk);
1016 if (err > 0) {
1017 pn->ifindex = err;
1018 err = 0;
1019 }
1020 } else {
1021 pn->ifindex = 0;
1022 release_sock(sk);
1023 gprs_detach(sk);
1024 err = 0;
1025 }
1026 goto out_norel;
Rémi Denis-Courmont03789f22010-10-08 04:02:02 +00001027
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +00001028 case PNPIPE_HANDLE:
1029 if ((sk->sk_state == TCP_CLOSE) &&
1030 (val >= 0) && (val < PN_PIPE_INVALID_HANDLE))
1031 pn->pipe_handle = val;
1032 else
1033 err = -EINVAL;
1034 break;
1035
1036 case PNPIPE_INITSTATE:
1037 pn->init_enable = !!val;
1038 break;
1039
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001040 default:
1041 err = -ENOPROTOOPT;
1042 }
1043 release_sock(sk);
1044
1045out_norel:
1046 return err;
1047}
1048
1049static int pep_getsockopt(struct sock *sk, int level, int optname,
1050 char __user *optval, int __user *optlen)
1051{
1052 struct pep_sock *pn = pep_sk(sk);
1053 int len, val;
1054
1055 if (level != SOL_PNPIPE)
1056 return -ENOPROTOOPT;
1057 if (get_user(len, optlen))
1058 return -EFAULT;
1059
1060 switch (optname) {
1061 case PNPIPE_ENCAP:
1062 val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE;
1063 break;
Kumar Sanghvi8d98efa2010-09-26 19:07:59 +00001064
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001065 case PNPIPE_IFINDEX:
1066 val = pn->ifindex;
1067 break;
Rémi Denis-Courmont03789f22010-10-08 04:02:02 +00001068
Rémi Denis-Courmontacaf7df2011-03-08 22:44:11 +00001069 case PNPIPE_HANDLE:
1070 val = pn->pipe_handle;
1071 if (val == PN_PIPE_INVALID_HANDLE)
1072 return -EINVAL;
1073 break;
1074
Dinesh Kumar Sharmabdb6e692011-11-18 01:22:05 +00001075 case PNPIPE_INITSTATE:
1076 val = pn->init_enable;
1077 break;
1078
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001079 default:
1080 return -ENOPROTOOPT;
1081 }
1082
1083 len = min_t(unsigned int, sizeof(int), len);
1084 if (put_user(len, optlen))
1085 return -EFAULT;
1086 if (put_user(val, (int __user *) optval))
1087 return -EFAULT;
1088 return 0;
1089}
1090
1091static int pipe_skb_send(struct sock *sk, struct sk_buff *skb)
1092{
1093 struct pep_sock *pn = pep_sk(sk);
1094 struct pnpipehdr *ph;
Rémi Denis-Courmonte1a59642010-09-29 22:33:50 +00001095 int err;
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001096
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -08001097 if (pn_flow_safe(pn->tx_fc) &&
1098 !atomic_add_unless(&pn->tx_credits, -1, 0)) {
1099 kfree_skb(skb);
1100 return -ENOBUFS;
1101 }
1102
Rémi Denis-Courmontfea93ec2010-01-04 02:02:48 +00001103 skb_push(skb, 3 + pn->aligned);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001104 skb_reset_transport_header(skb);
1105 ph = pnp_hdr(skb);
1106 ph->utid = 0;
Rémi Denis-Courmontfea93ec2010-01-04 02:02:48 +00001107 if (pn->aligned) {
1108 ph->message_id = PNS_PIPE_ALIGNED_DATA;
1109 ph->data[0] = 0; /* padding */
1110 } else
1111 ph->message_id = PNS_PIPE_DATA;
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001112 ph->pipe_handle = pn->pipe_handle;
Rémi Denis-Courmont14ba8fa2011-02-24 23:14:58 +00001113 err = pn_skb_send(sk, skb, NULL);
Rémi Denis-Courmonte1a59642010-09-29 22:33:50 +00001114
1115 if (err && pn_flow_safe(pn->tx_fc))
1116 atomic_inc(&pn->tx_credits);
1117 return err;
1118
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001119}
1120
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001121static int pep_sendmsg(struct kiocb *iocb, struct sock *sk,
1122 struct msghdr *msg, size_t len)
1123{
1124 struct pep_sock *pn = pep_sk(sk);
Rémi Denis-Courmontb1704372009-11-09 04:06:40 +00001125 struct sk_buff *skb;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001126 long timeo;
1127 int flags = msg->msg_flags;
1128 int err, done;
1129
Sasha Levinbcf1b702012-04-05 12:07:45 +00001130 if (len > USHRT_MAX)
1131 return -EMSGSIZE;
1132
Rémi Denis-Courmont82ecbcb2010-01-04 02:02:49 +00001133 if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL|
1134 MSG_CMSG_COMPAT)) ||
1135 !(msg->msg_flags & MSG_EOR))
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001136 return -EOPNOTSUPP;
1137
Rémi Denis-Courmontb1704372009-11-09 04:06:40 +00001138 skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len,
1139 flags & MSG_DONTWAIT, &err);
1140 if (!skb)
Rémi Denis-Courmont02ac3262010-08-30 12:57:04 +00001141 return err;
Rémi Denis-Courmontb1704372009-11-09 04:06:40 +00001142
Rémi Denis-Courmont638be342011-03-15 14:55:49 -07001143 skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned);
Rémi Denis-Courmontb1704372009-11-09 04:06:40 +00001144 err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
1145 if (err < 0)
1146 goto outfree;
1147
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001148 lock_sock(sk);
1149 timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT);
1150 if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) {
1151 err = -ENOTCONN;
1152 goto out;
1153 }
1154 if (sk->sk_state != TCP_ESTABLISHED) {
1155 /* Wait until the pipe gets to enabled state */
1156disabled:
1157 err = sk_stream_wait_connect(sk, &timeo);
1158 if (err)
1159 goto out;
1160
1161 if (sk->sk_state == TCP_CLOSE_WAIT) {
1162 err = -ECONNRESET;
1163 goto out;
1164 }
1165 }
1166 BUG_ON(sk->sk_state != TCP_ESTABLISHED);
1167
1168 /* Wait until flow control allows TX */
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -08001169 done = atomic_read(&pn->tx_credits);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001170 while (!done) {
1171 DEFINE_WAIT(wait);
1172
1173 if (!timeo) {
1174 err = -EAGAIN;
1175 goto out;
1176 }
1177 if (signal_pending(current)) {
1178 err = sock_intr_errno(timeo);
1179 goto out;
1180 }
1181
Eric Dumazet43815482010-04-29 11:01:49 +00001182 prepare_to_wait(sk_sleep(sk), &wait,
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001183 TASK_INTERRUPTIBLE);
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -08001184 done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits));
Eric Dumazet43815482010-04-29 11:01:49 +00001185 finish_wait(sk_sleep(sk), &wait);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001186
1187 if (sk->sk_state != TCP_ESTABLISHED)
1188 goto disabled;
1189 }
1190
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001191 err = pipe_skb_send(sk, skb);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001192 if (err >= 0)
1193 err = len; /* success! */
1194 skb = NULL;
1195out:
1196 release_sock(sk);
Rémi Denis-Courmontb1704372009-11-09 04:06:40 +00001197outfree:
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001198 kfree_skb(skb);
1199 return err;
1200}
1201
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001202int pep_writeable(struct sock *sk)
1203{
1204 struct pep_sock *pn = pep_sk(sk);
1205
Rémi Denis-Courmontbe677732008-12-17 15:48:31 -08001206 return atomic_read(&pn->tx_credits);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001207}
1208
1209int pep_write(struct sock *sk, struct sk_buff *skb)
1210{
1211 struct sk_buff *rskb, *fs;
1212 int flen = 0;
1213
Rémi Denis-Courmontfea93ec2010-01-04 02:02:48 +00001214 if (pep_sk(sk)->aligned)
1215 return pipe_skb_send(sk, skb);
1216
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001217 rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
1218 if (!rskb) {
1219 kfree_skb(skb);
1220 return -ENOMEM;
1221 }
1222 skb_shinfo(rskb)->frag_list = skb;
1223 rskb->len += skb->len;
1224 rskb->data_len += rskb->len;
1225 rskb->truesize += rskb->len;
1226
1227 /* Avoid nested fragments */
David S. Miller5c313e92009-06-09 00:21:58 -07001228 skb_walk_frags(skb, fs)
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001229 flen += fs->len;
1230 skb->next = skb_shinfo(skb)->frag_list;
David S. Miller5c313e92009-06-09 00:21:58 -07001231 skb_frag_list_init(skb);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001232 skb->len -= flen;
1233 skb->data_len -= flen;
1234 skb->truesize -= flen;
1235
1236 skb_reserve(rskb, MAX_PHONET_HEADER + 3);
1237 return pipe_skb_send(sk, rskb);
1238}
1239
1240struct sk_buff *pep_read(struct sock *sk)
1241{
1242 struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
1243
1244 if (sk->sk_state == TCP_ESTABLISHED)
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +00001245 pipe_grant_credits(sk, GFP_ATOMIC);
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001246 return skb;
1247}
1248
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001249static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
1250 struct msghdr *msg, size_t len, int noblock,
1251 int flags, int *addr_len)
1252{
1253 struct sk_buff *skb;
1254 int err;
1255
Rémi Denis-Courmont82ecbcb2010-01-04 02:02:49 +00001256 if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL|
1257 MSG_NOSIGNAL|MSG_CMSG_COMPAT))
1258 return -EOPNOTSUPP;
1259
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001260 if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE)))
1261 return -ENOTCONN;
1262
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -07001263 if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) {
1264 /* Dequeue and acknowledge control request */
1265 struct pep_sock *pn = pep_sk(sk);
1266
Rémi Denis-Courmont82ecbcb2010-01-04 02:02:49 +00001267 if (flags & MSG_PEEK)
1268 return -EOPNOTSUPP;
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -07001269 skb = skb_dequeue(&pn->ctrlreq_queue);
1270 if (skb) {
1271 pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR,
1272 GFP_KERNEL);
1273 msg->msg_flags |= MSG_OOB;
1274 goto copy;
1275 }
1276 if (flags & MSG_OOB)
1277 return -EINVAL;
1278 }
1279
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001280 skb = skb_recv_datagram(sk, flags, noblock, &err);
1281 lock_sock(sk);
1282 if (skb == NULL) {
1283 if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT)
1284 err = -ECONNRESET;
1285 release_sock(sk);
1286 return err;
1287 }
1288
1289 if (sk->sk_state == TCP_ESTABLISHED)
Rémi Denis-Courmont44c9ab12011-03-08 22:44:09 +00001290 pipe_grant_credits(sk, GFP_KERNEL);
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001291 release_sock(sk);
Rémi Denis-Courmontc41bd97f82008-10-05 11:15:43 -07001292copy:
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001293 msg->msg_flags |= MSG_EOR;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001294 if (skb->len > len)
1295 msg->msg_flags |= MSG_TRUNC;
1296 else
1297 len = skb->len;
1298
1299 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
1300 if (!err)
1301 err = (flags & MSG_TRUNC) ? skb->len : len;
1302
1303 skb_free_datagram(sk, skb);
1304 return err;
1305}
1306
1307static void pep_sock_unhash(struct sock *sk)
1308{
1309 struct pep_sock *pn = pep_sk(sk);
1310 struct sock *skparent = NULL;
1311
1312 lock_sock(sk);
Kumar Sanghvib3d62552010-10-12 20:14:43 +00001313
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +00001314 if (pn->listener != NULL) {
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001315 skparent = pn->listener;
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +00001316 pn->listener = NULL;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001317 release_sock(sk);
1318
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001319 pn = pep_sk(skparent);
Rémi Denis-Courmont7dfde172010-05-26 00:44:44 +00001320 lock_sock(skparent);
1321 sk_del_node_init(sk);
1322 sk = skparent;
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001323 }
Rémi Denis-Courmont297edb62011-03-08 22:44:12 +00001324
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001325 /* Unhash a listening sock only when it is closed
1326 * and all of its active connected pipes are closed. */
1327 if (hlist_empty(&pn->hlist))
1328 pn_sock_unhash(&pn->pn_sk.sk);
1329 release_sock(sk);
1330
1331 if (skparent)
1332 sock_put(skparent);
1333}
1334
1335static struct proto pep_proto = {
1336 .close = pep_sock_close,
1337 .accept = pep_sock_accept,
Kumar Sanghvib3d62552010-10-12 20:14:43 +00001338 .connect = pep_sock_connect,
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001339 .ioctl = pep_ioctl,
1340 .init = pep_init,
Rémi Denis-Courmont02a47612008-10-05 11:16:16 -07001341 .setsockopt = pep_setsockopt,
1342 .getsockopt = pep_getsockopt,
Rémi Denis-Courmont96414582008-10-05 11:15:13 -07001343 .sendmsg = pep_sendmsg,
1344 .recvmsg = pep_recvmsg,
1345 .backlog_rcv = pep_do_rcv,
1346 .hash = pn_sock_hash,
1347 .unhash = pep_sock_unhash,
1348 .get_port = pn_sock_get_port,
1349 .obj_size = sizeof(struct pep_sock),
1350 .owner = THIS_MODULE,
1351 .name = "PNPIPE",
1352};
1353
1354static struct phonet_protocol pep_pn_proto = {
1355 .ops = &phonet_stream_ops,
1356 .prot = &pep_proto,
1357 .sock_type = SOCK_SEQPACKET,
1358};
1359
1360static int __init pep_register(void)
1361{
1362 return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto);
1363}
1364
1365static void __exit pep_unregister(void)
1366{
1367 phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto);
1368}
1369
1370module_init(pep_register);
1371module_exit(pep_unregister);
1372MODULE_AUTHOR("Remi Denis-Courmont, Nokia");
1373MODULE_DESCRIPTION("Phonet pipe protocol");
1374MODULE_LICENSE("GPL");
1375MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE);