blob: 791249316ef3500f6f500400538e4360ccef33ac [file] [log] [blame]
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001/*
2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland sjur.brandeland@stericsson.com
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00004 * License terms: GNU General Public License (GPL) version 2
5 */
6
7#include <linux/fs.h>
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/sched.h>
11#include <linux/spinlock.h>
12#include <linux/mutex.h>
13#include <linux/list.h>
14#include <linux/wait.h>
15#include <linux/poll.h>
16#include <linux/tcp.h>
17#include <linux/uaccess.h>
Sjur Braendelandbece7b22010-04-28 08:54:38 +000018#include <linux/mutex.h>
19#include <linux/debugfs.h>
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000020#include <linux/caif/caif_socket.h>
Sjur Braendelandbece7b22010-04-28 08:54:38 +000021#include <asm/atomic.h>
22#include <net/sock.h>
23#include <net/tcp_states.h>
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000024#include <net/caif/caif_layer.h>
25#include <net/caif/caif_dev.h>
26#include <net/caif/cfpkt.h>
27
28MODULE_LICENSE("GPL");
Sjur Braendelandbece7b22010-04-28 08:54:38 +000029MODULE_ALIAS_NETPROTO(AF_CAIF);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000030
Sjur Braendelandbece7b22010-04-28 08:54:38 +000031#define CAIF_DEF_SNDBUF (CAIF_MAX_PAYLOAD_SIZE*10)
32#define CAIF_DEF_RCVBUF (CAIF_MAX_PAYLOAD_SIZE*100)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000033
Sjur Braendelandbece7b22010-04-28 08:54:38 +000034/*
35 * CAIF state is re-using the TCP socket states.
36 * caif_states stored in sk_state reflect the state as reported by
37 * the CAIF stack, while sk_socket->state is the state of the socket.
38 */
39enum caif_states {
40 CAIF_CONNECTED = TCP_ESTABLISHED,
41 CAIF_CONNECTING = TCP_SYN_SENT,
42 CAIF_DISCONNECTED = TCP_CLOSE
43};
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000044
Sjur Braendelandbece7b22010-04-28 08:54:38 +000045#define TX_FLOW_ON_BIT 1
46#define RX_FLOW_ON_BIT 2
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000047
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000048static struct dentry *debugfsdir;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000049
50#ifdef CONFIG_DEBUG_FS
51struct debug_fs_counter {
Sjur Braendelandbece7b22010-04-28 08:54:38 +000052 atomic_t caif_nr_socks;
53 atomic_t num_connect_req;
54 atomic_t num_connect_resp;
55 atomic_t num_connect_fail_resp;
56 atomic_t num_disconnect;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000057 atomic_t num_remote_shutdown_ind;
58 atomic_t num_tx_flow_off_ind;
59 atomic_t num_tx_flow_on_ind;
60 atomic_t num_rx_flow_off;
61 atomic_t num_rx_flow_on;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000062};
Sjur Braendelanda9a8f102010-05-21 02:16:11 +000063static struct debug_fs_counter cnt;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000064#define dbfs_atomic_inc(v) atomic_inc(v)
65#define dbfs_atomic_dec(v) atomic_dec(v)
66#else
67#define dbfs_atomic_inc(v)
68#define dbfs_atomic_dec(v)
69#endif
70
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000071struct caifsock {
Sjur Braendelandbece7b22010-04-28 08:54:38 +000072 struct sock sk; /* must be first member */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000073 struct cflayer layer;
Sjur Braendelandbece7b22010-04-28 08:54:38 +000074 char name[CAIF_LAYER_NAME_SZ]; /* Used for debugging */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000075 u32 flow_state;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000076 struct caif_connect_request conn_req;
Sjur Braendelandbece7b22010-04-28 08:54:38 +000077 struct mutex readlock;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +000078 struct dentry *debugfs_socket_dir;
79};
80
Sjur Braendelandbece7b22010-04-28 08:54:38 +000081static int rx_flow_is_on(struct caifsock *cf_sk)
82{
83 return test_bit(RX_FLOW_ON_BIT,
84 (void *) &cf_sk->flow_state);
85}
86
87static int tx_flow_is_on(struct caifsock *cf_sk)
88{
89 return test_bit(TX_FLOW_ON_BIT,
90 (void *) &cf_sk->flow_state);
91}
92
93static void set_rx_flow_off(struct caifsock *cf_sk)
94{
95 clear_bit(RX_FLOW_ON_BIT,
96 (void *) &cf_sk->flow_state);
97}
98
99static void set_rx_flow_on(struct caifsock *cf_sk)
100{
101 set_bit(RX_FLOW_ON_BIT,
102 (void *) &cf_sk->flow_state);
103}
104
105static void set_tx_flow_off(struct caifsock *cf_sk)
106{
107 clear_bit(TX_FLOW_ON_BIT,
108 (void *) &cf_sk->flow_state);
109}
110
111static void set_tx_flow_on(struct caifsock *cf_sk)
112{
113 set_bit(TX_FLOW_ON_BIT,
114 (void *) &cf_sk->flow_state);
115}
116
117static void caif_read_lock(struct sock *sk)
118{
119 struct caifsock *cf_sk;
120 cf_sk = container_of(sk, struct caifsock, sk);
121 mutex_lock(&cf_sk->readlock);
122}
123
124static void caif_read_unlock(struct sock *sk)
125{
126 struct caifsock *cf_sk;
127 cf_sk = container_of(sk, struct caifsock, sk);
128 mutex_unlock(&cf_sk->readlock);
129}
130
Sjur Braendelanda9a8f102010-05-21 02:16:11 +0000131static int sk_rcvbuf_lowwater(struct caifsock *cf_sk)
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000132{
133 /* A quarter of full buffer is used a low water mark */
134 return cf_sk->sk.sk_rcvbuf / 4;
135}
136
Sjur Braendelanda9a8f102010-05-21 02:16:11 +0000137static void caif_flow_ctrl(struct sock *sk, int mode)
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000138{
139 struct caifsock *cf_sk;
140 cf_sk = container_of(sk, struct caifsock, sk);
Sjur Braendelandca6a09f2010-05-21 02:16:10 +0000141 if (cf_sk->layer.dn && cf_sk->layer.dn->modemcmd)
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000142 cf_sk->layer.dn->modemcmd(cf_sk->layer.dn, mode);
143}
144
145/*
146 * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
147 * not dropped, but CAIF is sending flow off instead.
148 */
Sjur Braendelanda9a8f102010-05-21 02:16:11 +0000149static int caif_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000150{
151 int err;
152 int skb_len;
153 unsigned long flags;
154 struct sk_buff_head *list = &sk->sk_receive_queue;
155 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
156
157 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
158 (unsigned)sk->sk_rcvbuf && rx_flow_is_on(cf_sk)) {
159 trace_printk("CAIF: %s():"
160 " sending flow OFF (queue len = %d %d)\n",
161 __func__,
162 atomic_read(&cf_sk->sk.sk_rmem_alloc),
163 sk_rcvbuf_lowwater(cf_sk));
164 set_rx_flow_off(cf_sk);
Sjur Braendelandca6a09f2010-05-21 02:16:10 +0000165 dbfs_atomic_inc(&cnt.num_rx_flow_off);
166 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000167 }
168
169 err = sk_filter(sk, skb);
170 if (err)
171 return err;
172 if (!sk_rmem_schedule(sk, skb->truesize) && rx_flow_is_on(cf_sk)) {
173 set_rx_flow_off(cf_sk);
174 trace_printk("CAIF: %s():"
175 " sending flow OFF due to rmem_schedule\n",
176 __func__);
Sjur Braendelandca6a09f2010-05-21 02:16:10 +0000177 dbfs_atomic_inc(&cnt.num_rx_flow_off);
178 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_OFF_REQ);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000179 }
180 skb->dev = NULL;
181 skb_set_owner_r(skb, sk);
182 /* Cache the SKB length before we tack it onto the receive
183 * queue. Once it is added it no longer belongs to us and
184 * may be freed by other threads of control pulling packets
185 * from the queue.
186 */
187 skb_len = skb->len;
188 spin_lock_irqsave(&list->lock, flags);
189 if (!sock_flag(sk, SOCK_DEAD))
190 __skb_queue_tail(list, skb);
191 spin_unlock_irqrestore(&list->lock, flags);
192
193 if (!sock_flag(sk, SOCK_DEAD))
194 sk->sk_data_ready(sk, skb_len);
195 else
196 kfree_skb(skb);
197 return 0;
198}
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000199
200/* Packet Receive Callback function called from CAIF Stack */
201static int caif_sktrecv_cb(struct cflayer *layr, struct cfpkt *pkt)
202{
203 struct caifsock *cf_sk;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000204 struct sk_buff *skb;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000205
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000206 cf_sk = container_of(layr, struct caifsock, layer);
207 skb = cfpkt_tonative(pkt);
208
209 if (unlikely(cf_sk->sk.sk_state != CAIF_CONNECTED)) {
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000210 cfpkt_destroy(pkt);
211 return 0;
212 }
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000213 caif_queue_rcv_skb(&cf_sk->sk, skb);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000214 return 0;
215}
216
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000217/* Packet Control Callback function called from CAIF */
218static void caif_ctrl_cb(struct cflayer *layr,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000219 enum caif_ctrlcmd flow,
220 int phyid)
221{
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000222 struct caifsock *cf_sk = container_of(layr, struct caifsock, layer);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000223 switch (flow) {
224 case CAIF_CTRLCMD_FLOW_ON_IND:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000225 /* OK from modem to start sending again */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000226 dbfs_atomic_inc(&cnt.num_tx_flow_on_ind);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000227 set_tx_flow_on(cf_sk);
228 cf_sk->sk.sk_state_change(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000229 break;
230
231 case CAIF_CTRLCMD_FLOW_OFF_IND:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000232 /* Modem asks us to shut up */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000233 dbfs_atomic_inc(&cnt.num_tx_flow_off_ind);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000234 set_tx_flow_off(cf_sk);
235 cf_sk->sk.sk_state_change(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000236 break;
237
238 case CAIF_CTRLCMD_INIT_RSP:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000239 /* We're now connected */
240 dbfs_atomic_inc(&cnt.num_connect_resp);
241 cf_sk->sk.sk_state = CAIF_CONNECTED;
242 set_tx_flow_on(cf_sk);
243 cf_sk->sk.sk_state_change(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000244 break;
245
246 case CAIF_CTRLCMD_DEINIT_RSP:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000247 /* We're now disconnected */
248 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
249 cf_sk->sk.sk_state_change(&cf_sk->sk);
250 cfcnfg_release_adap_layer(&cf_sk->layer);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000251 break;
252
253 case CAIF_CTRLCMD_INIT_FAIL_RSP:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000254 /* Connect request failed */
255 dbfs_atomic_inc(&cnt.num_connect_fail_resp);
256 cf_sk->sk.sk_err = ECONNREFUSED;
257 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
258 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
259 /*
260 * Socket "standards" seems to require POLLOUT to
261 * be set at connect failure.
262 */
263 set_tx_flow_on(cf_sk);
264 cf_sk->sk.sk_state_change(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000265 break;
266
267 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000268 /* Modem has closed this connection, or device is down. */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000269 dbfs_atomic_inc(&cnt.num_remote_shutdown_ind);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000270 cf_sk->sk.sk_shutdown = SHUTDOWN_MASK;
271 cf_sk->sk.sk_err = ECONNRESET;
272 set_rx_flow_on(cf_sk);
273 cf_sk->sk.sk_error_report(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000274 break;
275
276 default:
277 pr_debug("CAIF: %s(): Unexpected flow command %d\n",
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000278 __func__, flow);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000279 }
280}
281
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000282static void caif_check_flow_release(struct sock *sk)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000283{
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000284 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
285
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000286 if (rx_flow_is_on(cf_sk))
287 return;
288
289 if (atomic_read(&sk->sk_rmem_alloc) <= sk_rcvbuf_lowwater(cf_sk)) {
290 dbfs_atomic_inc(&cnt.num_rx_flow_on);
291 set_rx_flow_on(cf_sk);
Sjur Braendelandca6a09f2010-05-21 02:16:10 +0000292 caif_flow_ctrl(sk, CAIF_MODEMCMD_FLOW_ON_REQ);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000293 }
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000294}
295
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000296/*
297 * Copied from unix_dgram_recvmsg, but removed credit checks,
298 * changed locking, address handling and added MSG_TRUNC.
299 */
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000300static int caif_seqpkt_recvmsg(struct kiocb *iocb, struct socket *sock,
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000301 struct msghdr *m, size_t len, int flags)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000302
303{
304 struct sock *sk = sock->sk;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000305 struct sk_buff *skb;
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000306 int ret;
307 int copylen;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000308
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000309 ret = -EOPNOTSUPP;
310 if (m->msg_flags&MSG_OOB)
311 goto read_error;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000312
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000313 skb = skb_recv_datagram(sk, flags, 0 , &ret);
314 if (!skb)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000315 goto read_error;
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000316 copylen = skb->len;
317 if (len < copylen) {
318 m->msg_flags |= MSG_TRUNC;
319 copylen = len;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000320 }
321
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000322 ret = skb_copy_datagram_iovec(skb, 0, m->msg_iov, copylen);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000323 if (ret)
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000324 goto out_free;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000325
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000326 ret = (flags & MSG_TRUNC) ? skb->len : copylen;
327out_free:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000328 skb_free_datagram(sk, skb);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000329 caif_check_flow_release(sk);
Sjur Braendelanddcda1382010-05-21 02:16:12 +0000330 return ret;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000331
332read_error:
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000333 return ret;
334}
335
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000336
337/* Copied from unix_stream_wait_data, identical except for lock call. */
338static long caif_stream_data_wait(struct sock *sk, long timeo)
339{
340 DEFINE_WAIT(wait);
341 lock_sock(sk);
342
343 for (;;) {
344 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
345
346 if (!skb_queue_empty(&sk->sk_receive_queue) ||
347 sk->sk_err ||
348 sk->sk_state != CAIF_CONNECTED ||
349 sock_flag(sk, SOCK_DEAD) ||
350 (sk->sk_shutdown & RCV_SHUTDOWN) ||
351 signal_pending(current) ||
352 !timeo)
353 break;
354
355 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
356 release_sock(sk);
357 timeo = schedule_timeout(timeo);
358 lock_sock(sk);
359 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
360 }
361
362 finish_wait(sk_sleep(sk), &wait);
363 release_sock(sk);
364 return timeo;
365}
366
367
368/*
369 * Copied from unix_stream_recvmsg, but removed credit checks,
370 * changed locking calls, changed address handling.
371 */
372static int caif_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
373 struct msghdr *msg, size_t size,
374 int flags)
375{
376 struct sock *sk = sock->sk;
377 int copied = 0;
378 int target;
379 int err = 0;
380 long timeo;
381
382 err = -EOPNOTSUPP;
383 if (flags&MSG_OOB)
384 goto out;
385
386 msg->msg_namelen = 0;
387
388 /*
389 * Lock the socket to prevent queue disordering
390 * while sleeps in memcpy_tomsg
391 */
392 err = -EAGAIN;
393 if (sk->sk_state == CAIF_CONNECTING)
394 goto out;
395
396 caif_read_lock(sk);
397 target = sock_rcvlowat(sk, flags&MSG_WAITALL, size);
398 timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT);
399
400 do {
401 int chunk;
402 struct sk_buff *skb;
403
404 lock_sock(sk);
405 skb = skb_dequeue(&sk->sk_receive_queue);
406 caif_check_flow_release(sk);
407
408 if (skb == NULL) {
409 if (copied >= target)
410 goto unlock;
411 /*
412 * POSIX 1003.1g mandates this order.
413 */
414 err = sock_error(sk);
415 if (err)
416 goto unlock;
417 err = -ECONNRESET;
418 if (sk->sk_shutdown & RCV_SHUTDOWN)
419 goto unlock;
420
421 err = -EPIPE;
422 if (sk->sk_state != CAIF_CONNECTED)
423 goto unlock;
424 if (sock_flag(sk, SOCK_DEAD))
425 goto unlock;
426
427 release_sock(sk);
428
429 err = -EAGAIN;
430 if (!timeo)
431 break;
432
433 caif_read_unlock(sk);
434
435 timeo = caif_stream_data_wait(sk, timeo);
436
437 if (signal_pending(current)) {
438 err = sock_intr_errno(timeo);
439 goto out;
440 }
441 caif_read_lock(sk);
442 continue;
443unlock:
444 release_sock(sk);
445 break;
446 }
447 release_sock(sk);
448 chunk = min_t(unsigned int, skb->len, size);
449 if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
450 skb_queue_head(&sk->sk_receive_queue, skb);
451 if (copied == 0)
452 copied = -EFAULT;
453 break;
454 }
455 copied += chunk;
456 size -= chunk;
457
458 /* Mark read part of skb as used */
459 if (!(flags & MSG_PEEK)) {
460 skb_pull(skb, chunk);
461
462 /* put the skb back if we didn't use it up. */
463 if (skb->len) {
464 skb_queue_head(&sk->sk_receive_queue, skb);
465 break;
466 }
467 kfree_skb(skb);
468
469 } else {
470 /*
471 * It is questionable, see note in unix_dgram_recvmsg.
472 */
473 /* put message back and return */
474 skb_queue_head(&sk->sk_receive_queue, skb);
475 break;
476 }
477 } while (size);
478 caif_read_unlock(sk);
479
480out:
481 return copied ? : err;
482}
483
484/*
485 * Copied from sock.c:sock_wait_for_wmem, but change to wait for
486 * CAIF flow-on and sock_writable.
487 */
488static long caif_wait_for_flow_on(struct caifsock *cf_sk,
489 int wait_writeable, long timeo, int *err)
490{
491 struct sock *sk = &cf_sk->sk;
492 DEFINE_WAIT(wait);
493 for (;;) {
494 *err = 0;
495 if (tx_flow_is_on(cf_sk) &&
496 (!wait_writeable || sock_writeable(&cf_sk->sk)))
497 break;
498 *err = -ETIMEDOUT;
499 if (!timeo)
500 break;
501 *err = -ERESTARTSYS;
502 if (signal_pending(current))
503 break;
504 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
505 *err = -ECONNRESET;
506 if (sk->sk_shutdown & SHUTDOWN_MASK)
507 break;
508 *err = -sk->sk_err;
509 if (sk->sk_err)
510 break;
511 *err = -EPIPE;
512 if (cf_sk->sk.sk_state != CAIF_CONNECTED)
513 break;
514 timeo = schedule_timeout(timeo);
515 }
516 finish_wait(sk_sleep(sk), &wait);
517 return timeo;
518}
519
520/*
521 * Transmit a SKB. The device may temporarily request re-transmission
522 * by returning EAGAIN.
523 */
524static int transmit_skb(struct sk_buff *skb, struct caifsock *cf_sk,
525 int noblock, long timeo)
526{
527 struct cfpkt *pkt;
528 int ret, loopcnt = 0;
529
530 pkt = cfpkt_fromnative(CAIF_DIR_OUT, skb);
531 memset(cfpkt_info(pkt), 0, sizeof(struct caif_payload_info));
532 do {
533
534 ret = -ETIMEDOUT;
535
536 /* Slight paranoia, probably not needed. */
537 if (unlikely(loopcnt++ > 1000)) {
538 pr_warning("CAIF: %s(): transmit retries failed,"
539 " error = %d\n", __func__, ret);
540 break;
541 }
542
543 if (cf_sk->layer.dn != NULL)
544 ret = cf_sk->layer.dn->transmit(cf_sk->layer.dn, pkt);
545 if (likely(ret >= 0))
546 break;
547 /* if transmit return -EAGAIN, then retry */
548 if (noblock && ret == -EAGAIN)
549 break;
550 timeo = caif_wait_for_flow_on(cf_sk, 0, timeo, &ret);
551 if (signal_pending(current)) {
552 ret = sock_intr_errno(timeo);
553 break;
554 }
555 if (ret)
556 break;
557 if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
558 sock_flag(&cf_sk->sk, SOCK_DEAD) ||
559 (cf_sk->sk.sk_shutdown & RCV_SHUTDOWN)) {
560 ret = -EPIPE;
561 cf_sk->sk.sk_err = EPIPE;
562 break;
563 }
564 } while (ret == -EAGAIN);
565 return ret;
566}
567
568/* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
569static int caif_seqpkt_sendmsg(struct kiocb *kiocb, struct socket *sock,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000570 struct msghdr *msg, size_t len)
571{
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000572 struct sock *sk = sock->sk;
573 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000574 int buffer_size;
575 int ret = 0;
576 struct sk_buff *skb = NULL;
577 int noblock;
578 long timeo;
579 caif_assert(cf_sk);
580 ret = sock_error(sk);
581 if (ret)
582 goto err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000583
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000584 ret = -EOPNOTSUPP;
585 if (msg->msg_flags&MSG_OOB)
586 goto err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000587
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000588 ret = -EOPNOTSUPP;
589 if (msg->msg_namelen)
590 goto err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000591
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000592 ret = -EINVAL;
593 if (unlikely(msg->msg_iov->iov_base == NULL))
594 goto err;
595 noblock = msg->msg_flags & MSG_DONTWAIT;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000596
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000597 buffer_size = len + CAIF_NEEDED_HEADROOM + CAIF_NEEDED_TAILROOM;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000598
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000599 ret = -EMSGSIZE;
600 if (buffer_size > CAIF_MAX_PAYLOAD_SIZE)
601 goto err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000602
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000603 timeo = sock_sndtimeo(sk, noblock);
604 timeo = caif_wait_for_flow_on(container_of(sk, struct caifsock, sk),
605 1, timeo, &ret);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000606
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000607 ret = -EPIPE;
608 if (cf_sk->sk.sk_state != CAIF_CONNECTED ||
609 sock_flag(sk, SOCK_DEAD) ||
610 (sk->sk_shutdown & RCV_SHUTDOWN))
611 goto err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000612
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000613 ret = -ENOMEM;
614 skb = sock_alloc_send_skb(sk, buffer_size, noblock, &ret);
615 if (!skb)
616 goto err;
617 skb_reserve(skb, CAIF_NEEDED_HEADROOM);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000618
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000619 ret = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000620
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000621 if (ret)
622 goto err;
623 ret = transmit_skb(skb, cf_sk, noblock, timeo);
624 if (ret < 0)
625 goto err;
626 return len;
627err:
628 kfree_skb(skb);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000629 return ret;
630}
631
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000632/*
633 * Copied from unix_stream_sendmsg and adapted to CAIF:
634 * Changed removed permission handling and added waiting for flow on
635 * and other minor adaptations.
636 */
637static int caif_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
638 struct msghdr *msg, size_t len)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000639{
640 struct sock *sk = sock->sk;
641 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000642 int err, size;
643 struct sk_buff *skb;
644 int sent = 0;
645 long timeo;
646
647 err = -EOPNOTSUPP;
648
649 if (unlikely(msg->msg_flags&MSG_OOB))
650 goto out_err;
651
652 if (unlikely(msg->msg_namelen))
653 goto out_err;
654
655 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
656 timeo = caif_wait_for_flow_on(cf_sk, 1, timeo, &err);
657
658 if (unlikely(sk->sk_shutdown & SEND_SHUTDOWN))
659 goto pipe_err;
660
661 while (sent < len) {
662
663 size = len-sent;
664
665 if (size > CAIF_MAX_PAYLOAD_SIZE)
666 size = CAIF_MAX_PAYLOAD_SIZE;
667
668 /* If size is more than half of sndbuf, chop up message */
669 if (size > ((sk->sk_sndbuf >> 1) - 64))
670 size = (sk->sk_sndbuf >> 1) - 64;
671
672 if (size > SKB_MAX_ALLOC)
673 size = SKB_MAX_ALLOC;
674
675 skb = sock_alloc_send_skb(sk,
676 size + CAIF_NEEDED_HEADROOM
677 + CAIF_NEEDED_TAILROOM,
678 msg->msg_flags&MSG_DONTWAIT,
679 &err);
680 if (skb == NULL)
681 goto out_err;
682
683 skb_reserve(skb, CAIF_NEEDED_HEADROOM);
684 /*
685 * If you pass two values to the sock_alloc_send_skb
686 * it tries to grab the large buffer with GFP_NOFS
687 * (which can fail easily), and if it fails grab the
688 * fallback size buffer which is under a page and will
689 * succeed. [Alan]
690 */
691 size = min_t(int, size, skb_tailroom(skb));
692
693 err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size);
694 if (err) {
695 kfree_skb(skb);
696 goto out_err;
697 }
698 err = transmit_skb(skb, cf_sk,
699 msg->msg_flags&MSG_DONTWAIT, timeo);
700 if (err < 0) {
701 kfree_skb(skb);
702 goto pipe_err;
703 }
704 sent += size;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000705 }
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000706
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000707 return sent;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000708
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000709pipe_err:
710 if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL))
711 send_sig(SIGPIPE, current, 0);
712 err = -EPIPE;
713out_err:
714 return sent ? : err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000715}
716
717static int setsockopt(struct socket *sock,
718 int lvl, int opt, char __user *ov, unsigned int ol)
719{
720 struct sock *sk = sock->sk;
721 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
722 int prio, linksel;
723 struct ifreq ifreq;
724
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000725 if (cf_sk->sk.sk_socket->state != SS_UNCONNECTED)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000726 return -ENOPROTOOPT;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000727
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000728 switch (opt) {
729 case CAIFSO_LINK_SELECT:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000730 if (ol < sizeof(int))
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000731 return -EINVAL;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000732 if (lvl != SOL_CAIF)
733 goto bad_sol;
734 if (copy_from_user(&linksel, ov, sizeof(int)))
735 return -EINVAL;
736 lock_sock(&(cf_sk->sk));
737 cf_sk->conn_req.link_selector = linksel;
738 release_sock(&cf_sk->sk);
739 return 0;
740
741 case SO_PRIORITY:
742 if (lvl != SOL_SOCKET)
743 goto bad_sol;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000744 if (ol < sizeof(int))
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000745 return -EINVAL;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000746 if (copy_from_user(&prio, ov, sizeof(int)))
747 return -EINVAL;
748 lock_sock(&(cf_sk->sk));
749 cf_sk->conn_req.priority = prio;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000750 release_sock(&cf_sk->sk);
751 return 0;
752
753 case SO_BINDTODEVICE:
754 if (lvl != SOL_SOCKET)
755 goto bad_sol;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000756 if (ol < sizeof(struct ifreq))
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000757 return -EINVAL;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000758 if (copy_from_user(&ifreq, ov, sizeof(ifreq)))
759 return -EFAULT;
760 lock_sock(&(cf_sk->sk));
761 strncpy(cf_sk->conn_req.link_name, ifreq.ifr_name,
762 sizeof(cf_sk->conn_req.link_name));
763 cf_sk->conn_req.link_name
764 [sizeof(cf_sk->conn_req.link_name)-1] = 0;
765 release_sock(&cf_sk->sk);
766 return 0;
767
768 case CAIFSO_REQ_PARAM:
769 if (lvl != SOL_CAIF)
770 goto bad_sol;
771 if (cf_sk->sk.sk_protocol != CAIFPROTO_UTIL)
772 return -ENOPROTOOPT;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000773 lock_sock(&(cf_sk->sk));
774 cf_sk->conn_req.param.size = ol;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000775 if (ol > sizeof(cf_sk->conn_req.param.data) ||
776 copy_from_user(&cf_sk->conn_req.param.data, ov, ol)) {
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000777 release_sock(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000778 return -EINVAL;
779 }
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000780 release_sock(&cf_sk->sk);
781 return 0;
782
783 default:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000784 return -ENOPROTOOPT;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000785 }
786
787 return 0;
788bad_sol:
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000789 return -ENOPROTOOPT;
790
791}
792
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000793/*
794 * caif_connect() - Connect a CAIF Socket
795 * Copied and modified af_irda.c:irda_connect().
796 *
797 * Note : by consulting "errno", the user space caller may learn the cause
798 * of the failure. Most of them are visible in the function, others may come
799 * from subroutines called and are listed here :
800 * o -EAFNOSUPPORT: bad socket family or type.
801 * o -ESOCKTNOSUPPORT: bad socket type or protocol
802 * o -EINVAL: bad socket address, or CAIF link type
803 * o -ECONNREFUSED: remote end refused the connection.
804 * o -EINPROGRESS: connect request sent but timed out (or non-blocking)
805 * o -EISCONN: already connected.
806 * o -ETIMEDOUT: Connection timed out (send timeout)
807 * o -ENODEV: No link layer to send request
808 * o -ECONNRESET: Received Shutdown indication or lost link layer
809 * o -ENOMEM: Out of memory
810 *
811 * State Strategy:
812 * o sk_state: holds the CAIF_* protocol state, it's updated by
813 * caif_ctrl_cb.
814 * o sock->state: holds the SS_* socket state and is updated by connect and
815 * disconnect.
816 */
817static int caif_connect(struct socket *sock, struct sockaddr *uaddr,
818 int addr_len, int flags)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000819{
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000820 struct sock *sk = sock->sk;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000821 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
822 long timeo;
823 int err;
824 lock_sock(sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000825
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000826 err = -EAFNOSUPPORT;
827 if (uaddr->sa_family != AF_CAIF)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000828 goto out;
829
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000830 err = -ESOCKTNOSUPPORT;
831 if (unlikely(!(sk->sk_type == SOCK_STREAM &&
832 cf_sk->sk.sk_protocol == CAIFPROTO_AT) &&
833 sk->sk_type != SOCK_SEQPACKET))
834 goto out;
835 switch (sock->state) {
836 case SS_UNCONNECTED:
837 /* Normal case, a fresh connect */
838 caif_assert(sk->sk_state == CAIF_DISCONNECTED);
839 break;
840 case SS_CONNECTING:
841 switch (sk->sk_state) {
842 case CAIF_CONNECTED:
843 sock->state = SS_CONNECTED;
844 err = -EISCONN;
845 goto out;
846 case CAIF_DISCONNECTED:
847 /* Reconnect allowed */
848 break;
849 case CAIF_CONNECTING:
850 err = -EALREADY;
851 if (flags & O_NONBLOCK)
852 goto out;
853 goto wait_connect;
854 }
855 break;
856 case SS_CONNECTED:
857 caif_assert(sk->sk_state == CAIF_CONNECTED ||
858 sk->sk_state == CAIF_DISCONNECTED);
859 if (sk->sk_shutdown & SHUTDOWN_MASK) {
860 /* Allow re-connect after SHUTDOWN_IND */
861 caif_disconnect_client(&cf_sk->layer);
862 break;
863 }
864 /* No reconnect on a seqpacket socket */
865 err = -EISCONN;
866 goto out;
867 case SS_DISCONNECTING:
868 case SS_FREE:
869 caif_assert(1); /*Should never happen */
870 break;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000871 }
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000872 sk->sk_state = CAIF_DISCONNECTED;
873 sock->state = SS_UNCONNECTED;
874 sk_stream_kill_queues(&cf_sk->sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000875
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000876 err = -EINVAL;
Dan Carpenterf5d72af2010-05-22 10:43:42 +0000877 if (addr_len != sizeof(struct sockaddr_caif))
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000878 goto out;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000879
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000880 memcpy(&cf_sk->conn_req.sockaddr, uaddr,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000881 sizeof(struct sockaddr_caif));
882
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000883 /* Move to connecting socket, start sending Connect Requests */
884 sock->state = SS_CONNECTING;
885 sk->sk_state = CAIF_CONNECTING;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000886
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000887 dbfs_atomic_inc(&cnt.num_connect_req);
888 cf_sk->layer.receive = caif_sktrecv_cb;
889 err = caif_connect_client(&cf_sk->conn_req,
890 &cf_sk->layer);
891 if (err < 0) {
892 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
893 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
894 goto out;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000895 }
896
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000897 err = -EINPROGRESS;
898wait_connect:
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000899
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000900 if (sk->sk_state != CAIF_CONNECTED && (flags & O_NONBLOCK))
901 goto out;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000902
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000903 timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000904
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000905 release_sock(sk);
Sjur Braendeland9e4b8162010-05-21 02:16:07 +0000906 err = -ERESTARTSYS;
907 timeo = wait_event_interruptible_timeout(*sk_sleep(sk),
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000908 sk->sk_state != CAIF_CONNECTING,
909 timeo);
910 lock_sock(sk);
Sjur Braendeland9e4b8162010-05-21 02:16:07 +0000911 if (timeo < 0)
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000912 goto out; /* -ERESTARTSYS */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000913
Sjur Braendeland9e4b8162010-05-21 02:16:07 +0000914 err = -ETIMEDOUT;
915 if (timeo == 0 && sk->sk_state != CAIF_CONNECTED)
916 goto out;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000917 if (sk->sk_state != CAIF_CONNECTED) {
918 sock->state = SS_UNCONNECTED;
919 err = sock_error(sk);
920 if (!err)
921 err = -ECONNREFUSED;
922 goto out;
923 }
924 sock->state = SS_CONNECTED;
925 err = 0;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000926out:
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000927 release_sock(sk);
928 return err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000929}
930
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000931/*
932 * caif_release() - Disconnect a CAIF Socket
933 * Copied and modified af_irda.c:irda_release().
934 */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000935static int caif_release(struct socket *sock)
936{
937 struct sock *sk = sock->sk;
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000938 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
939 int res = 0;
940
941 if (!sk)
942 return 0;
943
944 set_tx_flow_off(cf_sk);
945
946 /*
947 * Ensure that packets are not queued after this point in time.
948 * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
949 * this ensures no packets when sock is dead.
950 */
951 spin_lock(&sk->sk_receive_queue.lock);
952 sock_set_flag(sk, SOCK_DEAD);
953 spin_unlock(&sk->sk_receive_queue.lock);
954 sock->sk = NULL;
955
956 dbfs_atomic_inc(&cnt.num_disconnect);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000957
958 if (cf_sk->debugfs_socket_dir != NULL)
959 debugfs_remove_recursive(cf_sk->debugfs_socket_dir);
960
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000961 lock_sock(&(cf_sk->sk));
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000962 sk->sk_state = CAIF_DISCONNECTED;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000963 sk->sk_shutdown = SHUTDOWN_MASK;
964
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000965 if (cf_sk->sk.sk_socket->state == SS_CONNECTED ||
966 cf_sk->sk.sk_socket->state == SS_CONNECTING)
967 res = caif_disconnect_client(&cf_sk->layer);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000968
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000969 cf_sk->sk.sk_socket->state = SS_DISCONNECTING;
970 wake_up_interruptible_poll(sk_sleep(sk), POLLERR|POLLHUP);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000971
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000972 sock_orphan(sk);
973 cf_sk->layer.dn = NULL;
974 sk_stream_kill_queues(&cf_sk->sk);
975 release_sock(sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000976 sock_put(sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +0000977 return res;
978}
979
Sjur Braendelandbece7b22010-04-28 08:54:38 +0000980/* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
981static unsigned int caif_poll(struct file *file,
982 struct socket *sock, poll_table *wait)
983{
984 struct sock *sk = sock->sk;
985 unsigned int mask;
986 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
987
988 sock_poll_wait(file, sk_sleep(sk), wait);
989 mask = 0;
990
991 /* exceptional events? */
992 if (sk->sk_err)
993 mask |= POLLERR;
994 if (sk->sk_shutdown == SHUTDOWN_MASK)
995 mask |= POLLHUP;
996 if (sk->sk_shutdown & RCV_SHUTDOWN)
997 mask |= POLLRDHUP;
998
999 /* readable? */
1000 if (!skb_queue_empty(&sk->sk_receive_queue) ||
1001 (sk->sk_shutdown & RCV_SHUTDOWN))
1002 mask |= POLLIN | POLLRDNORM;
1003
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001004 /*
1005 * we set writable also when the other side has shut down the
1006 * connection. This prevents stuck sockets.
1007 */
1008 if (sock_writeable(sk) && tx_flow_is_on(cf_sk))
1009 mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
1010
1011 return mask;
1012}
1013
1014static const struct proto_ops caif_seqpacket_ops = {
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001015 .family = PF_CAIF,
1016 .owner = THIS_MODULE,
1017 .release = caif_release,
1018 .bind = sock_no_bind,
1019 .connect = caif_connect,
1020 .socketpair = sock_no_socketpair,
1021 .accept = sock_no_accept,
1022 .getname = sock_no_getname,
1023 .poll = caif_poll,
1024 .ioctl = sock_no_ioctl,
1025 .listen = sock_no_listen,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001026 .shutdown = sock_no_shutdown,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001027 .setsockopt = setsockopt,
1028 .getsockopt = sock_no_getsockopt,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001029 .sendmsg = caif_seqpkt_sendmsg,
1030 .recvmsg = caif_seqpkt_recvmsg,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001031 .mmap = sock_no_mmap,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001032 .sendpage = sock_no_sendpage,
1033};
1034
1035static const struct proto_ops caif_stream_ops = {
1036 .family = PF_CAIF,
1037 .owner = THIS_MODULE,
1038 .release = caif_release,
1039 .bind = sock_no_bind,
1040 .connect = caif_connect,
1041 .socketpair = sock_no_socketpair,
1042 .accept = sock_no_accept,
1043 .getname = sock_no_getname,
1044 .poll = caif_poll,
1045 .ioctl = sock_no_ioctl,
1046 .listen = sock_no_listen,
1047 .shutdown = sock_no_shutdown,
1048 .setsockopt = setsockopt,
1049 .getsockopt = sock_no_getsockopt,
1050 .sendmsg = caif_stream_sendmsg,
1051 .recvmsg = caif_stream_recvmsg,
1052 .mmap = sock_no_mmap,
1053 .sendpage = sock_no_sendpage,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001054};
1055
1056/* This function is called when a socket is finally destroyed. */
1057static void caif_sock_destructor(struct sock *sk)
1058{
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001059 struct caifsock *cf_sk = container_of(sk, struct caifsock, sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001060 caif_assert(!atomic_read(&sk->sk_wmem_alloc));
1061 caif_assert(sk_unhashed(sk));
1062 caif_assert(!sk->sk_socket);
1063 if (!sock_flag(sk, SOCK_DEAD)) {
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001064 pr_info("Attempt to release alive CAIF socket: %p\n", sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001065 return;
1066 }
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001067 sk_stream_kill_queues(&cf_sk->sk);
1068 dbfs_atomic_dec(&cnt.caif_nr_socks);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001069}
1070
1071static int caif_create(struct net *net, struct socket *sock, int protocol,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001072 int kern)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001073{
1074 struct sock *sk = NULL;
1075 struct caifsock *cf_sk = NULL;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001076 static struct proto prot = {.name = "PF_CAIF",
1077 .owner = THIS_MODULE,
1078 .obj_size = sizeof(struct caifsock),
1079 };
1080
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001081 if (!capable(CAP_SYS_ADMIN) && !capable(CAP_NET_ADMIN))
1082 return -EPERM;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001083 /*
1084 * The sock->type specifies the socket type to use.
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001085 * The CAIF socket is a packet stream in the sense
1086 * that it is packet based. CAIF trusts the reliability
1087 * of the link, no resending is implemented.
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001088 */
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001089 if (sock->type == SOCK_SEQPACKET)
1090 sock->ops = &caif_seqpacket_ops;
1091 else if (sock->type == SOCK_STREAM)
1092 sock->ops = &caif_stream_ops;
1093 else
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001094 return -ESOCKTNOSUPPORT;
1095
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001096 if (protocol < 0 || protocol >= CAIFPROTO_MAX)
1097 return -EPROTONOSUPPORT;
1098 /*
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001099 * Set the socket state to unconnected. The socket state
1100 * is really not used at all in the net/core or socket.c but the
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001101 * initialization makes sure that sock->state is not uninitialized.
1102 */
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001103 sk = sk_alloc(net, PF_CAIF, GFP_KERNEL, &prot);
1104 if (!sk)
1105 return -ENOMEM;
1106
1107 cf_sk = container_of(sk, struct caifsock, sk);
1108
1109 /* Store the protocol */
1110 sk->sk_protocol = (unsigned char) protocol;
1111
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001112 /* Sendbuf dictates the amount of outbound packets not yet sent */
1113 sk->sk_sndbuf = CAIF_DEF_SNDBUF;
1114 sk->sk_rcvbuf = CAIF_DEF_RCVBUF;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001115
1116 /*
1117 * Lock in order to try to stop someone from opening the socket
1118 * too early.
1119 */
1120 lock_sock(&(cf_sk->sk));
1121
1122 /* Initialize the nozero default sock structure data. */
1123 sock_init_data(sock, sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001124 sk->sk_destruct = caif_sock_destructor;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001125
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001126 mutex_init(&cf_sk->readlock); /* single task reading lock */
1127 cf_sk->layer.ctrlcmd = caif_ctrl_cb;
1128 cf_sk->sk.sk_socket->state = SS_UNCONNECTED;
1129 cf_sk->sk.sk_state = CAIF_DISCONNECTED;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001130
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001131 set_tx_flow_off(cf_sk);
1132 set_rx_flow_on(cf_sk);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001133
1134 /* Set default options on configuration */
1135 cf_sk->conn_req.priority = CAIF_PRIO_NORMAL;
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001136 cf_sk->conn_req.link_selector = CAIF_LINK_LOW_LATENCY;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001137 cf_sk->conn_req.protocol = protocol;
1138 /* Increase the number of sockets created. */
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001139 dbfs_atomic_inc(&cnt.caif_nr_socks);
1140#ifdef CONFIG_DEBUG_FS
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001141 if (!IS_ERR(debugfsdir)) {
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001142 /* Fill in some information concerning the misc socket. */
1143 snprintf(cf_sk->name, sizeof(cf_sk->name), "cfsk%d",
1144 atomic_read(&cnt.caif_nr_socks));
1145
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001146 cf_sk->debugfs_socket_dir =
1147 debugfs_create_dir(cf_sk->name, debugfsdir);
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001148 debugfs_create_u32("sk_state", S_IRUSR | S_IWUSR,
1149 cf_sk->debugfs_socket_dir,
1150 (u32 *) &cf_sk->sk.sk_state);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001151 debugfs_create_u32("flow_state", S_IRUSR | S_IWUSR,
1152 cf_sk->debugfs_socket_dir, &cf_sk->flow_state);
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001153 debugfs_create_u32("sk_rmem_alloc", S_IRUSR | S_IWUSR,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001154 cf_sk->debugfs_socket_dir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001155 (u32 *) &cf_sk->sk.sk_rmem_alloc);
1156 debugfs_create_u32("sk_wmem_alloc", S_IRUSR | S_IWUSR,
1157 cf_sk->debugfs_socket_dir,
1158 (u32 *) &cf_sk->sk.sk_wmem_alloc);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001159 debugfs_create_u32("identity", S_IRUSR | S_IWUSR,
1160 cf_sk->debugfs_socket_dir,
1161 (u32 *) &cf_sk->layer.id);
1162 }
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001163#endif
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001164 release_sock(&cf_sk->sk);
1165 return 0;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001166}
1167
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001168
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001169static struct net_proto_family caif_family_ops = {
1170 .family = PF_CAIF,
1171 .create = caif_create,
1172 .owner = THIS_MODULE,
1173};
1174
Sjur Braendelanda9a8f102010-05-21 02:16:11 +00001175static int af_caif_init(void)
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001176{
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001177 int err = sock_register(&caif_family_ops);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001178 if (!err)
1179 return err;
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001180 return 0;
1181}
1182
1183static int __init caif_sktinit_module(void)
1184{
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001185#ifdef CONFIG_DEBUG_FS
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001186 debugfsdir = debugfs_create_dir("caif_sk", NULL);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001187 if (!IS_ERR(debugfsdir)) {
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001188 debugfs_create_u32("num_sockets", S_IRUSR | S_IWUSR,
1189 debugfsdir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001190 (u32 *) &cnt.caif_nr_socks);
1191 debugfs_create_u32("num_connect_req", S_IRUSR | S_IWUSR,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001192 debugfsdir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001193 (u32 *) &cnt.num_connect_req);
1194 debugfs_create_u32("num_connect_resp", S_IRUSR | S_IWUSR,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001195 debugfsdir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001196 (u32 *) &cnt.num_connect_resp);
1197 debugfs_create_u32("num_connect_fail_resp", S_IRUSR | S_IWUSR,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001198 debugfsdir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001199 (u32 *) &cnt.num_connect_fail_resp);
1200 debugfs_create_u32("num_disconnect", S_IRUSR | S_IWUSR,
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001201 debugfsdir,
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001202 (u32 *) &cnt.num_disconnect);
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001203 debugfs_create_u32("num_remote_shutdown_ind",
1204 S_IRUSR | S_IWUSR, debugfsdir,
1205 (u32 *) &cnt.num_remote_shutdown_ind);
1206 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR | S_IWUSR,
1207 debugfsdir,
1208 (u32 *) &cnt.num_tx_flow_off_ind);
1209 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR | S_IWUSR,
1210 debugfsdir,
1211 (u32 *) &cnt.num_tx_flow_on_ind);
1212 debugfs_create_u32("num_rx_flow_off", S_IRUSR | S_IWUSR,
1213 debugfsdir,
1214 (u32 *) &cnt.num_rx_flow_off);
1215 debugfs_create_u32("num_rx_flow_on", S_IRUSR | S_IWUSR,
1216 debugfsdir,
1217 (u32 *) &cnt.num_rx_flow_on);
1218 }
1219#endif
Sjur Braendelandbece7b22010-04-28 08:54:38 +00001220 return af_caif_init();
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001221}
1222
1223static void __exit caif_sktexit_module(void)
1224{
1225 sock_unregister(PF_CAIF);
1226 if (debugfsdir != NULL)
1227 debugfs_remove_recursive(debugfsdir);
1228}
Sjur Braendelande6f95ec2010-03-30 13:56:26 +00001229module_init(caif_sktinit_module);
1230module_exit(caif_sktexit_module);