2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland sjur.brandeland@stericsson.com
4 * License terms: GNU General Public License (GPL) version 2
7 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
10 #include <linux/init.h>
11 #include <linux/module.h>
12 #include <linux/sched.h>
13 #include <linux/spinlock.h>
14 #include <linux/mutex.h>
15 #include <linux/list.h>
16 #include <linux/wait.h>
17 #include <linux/poll.h>
18 #include <linux/tcp.h>
19 #include <linux/uaccess.h>
20 #include <linux/mutex.h>
21 #include <linux/debugfs.h>
22 #include <linux/caif/caif_socket.h>
23 #include <asm/atomic.h>
25 #include <net/tcp_states.h>
26 #include <net/caif/caif_layer.h>
27 #include <net/caif/caif_dev.h>
28 #include <net/caif/cfpkt.h>
30 MODULE_LICENSE("GPL");
31 MODULE_ALIAS_NETPROTO(AF_CAIF
);
34 * CAIF state is re-using the TCP socket states.
35 * caif_states stored in sk_state reflect the state as reported by
36 * the CAIF stack, while sk_socket->state is the state of the socket.
39 CAIF_CONNECTED
= TCP_ESTABLISHED
,
40 CAIF_CONNECTING
= TCP_SYN_SENT
,
41 CAIF_DISCONNECTED
= TCP_CLOSE
44 #define TX_FLOW_ON_BIT 1
45 #define RX_FLOW_ON_BIT 2
47 static struct dentry
*debugfsdir
;
49 #ifdef CONFIG_DEBUG_FS
50 struct debug_fs_counter
{
51 atomic_t caif_nr_socks
;
52 atomic_t num_connect_req
;
53 atomic_t num_connect_resp
;
54 atomic_t num_connect_fail_resp
;
55 atomic_t num_disconnect
;
56 atomic_t num_remote_shutdown_ind
;
57 atomic_t num_tx_flow_off_ind
;
58 atomic_t num_tx_flow_on_ind
;
59 atomic_t num_rx_flow_off
;
60 atomic_t num_rx_flow_on
;
62 static struct debug_fs_counter cnt
;
63 #define dbfs_atomic_inc(v) atomic_inc(v)
64 #define dbfs_atomic_dec(v) atomic_dec(v)
66 #define dbfs_atomic_inc(v)
67 #define dbfs_atomic_dec(v)
71 struct sock sk
; /* must be first member */
73 char name
[CAIF_LAYER_NAME_SZ
]; /* Used for debugging */
75 struct caif_connect_request conn_req
;
76 struct mutex readlock
;
77 struct dentry
*debugfs_socket_dir
;
78 int headroom
, tailroom
, maxframe
;
81 static int rx_flow_is_on(struct caifsock
*cf_sk
)
83 return test_bit(RX_FLOW_ON_BIT
,
84 (void *) &cf_sk
->flow_state
);
87 static int tx_flow_is_on(struct caifsock
*cf_sk
)
89 return test_bit(TX_FLOW_ON_BIT
,
90 (void *) &cf_sk
->flow_state
);
93 static void set_rx_flow_off(struct caifsock
*cf_sk
)
95 clear_bit(RX_FLOW_ON_BIT
,
96 (void *) &cf_sk
->flow_state
);
99 static void set_rx_flow_on(struct caifsock
*cf_sk
)
101 set_bit(RX_FLOW_ON_BIT
,
102 (void *) &cf_sk
->flow_state
);
105 static void set_tx_flow_off(struct caifsock
*cf_sk
)
107 clear_bit(TX_FLOW_ON_BIT
,
108 (void *) &cf_sk
->flow_state
);
111 static void set_tx_flow_on(struct caifsock
*cf_sk
)
113 set_bit(TX_FLOW_ON_BIT
,
114 (void *) &cf_sk
->flow_state
);
117 static void caif_read_lock(struct sock
*sk
)
119 struct caifsock
*cf_sk
;
120 cf_sk
= container_of(sk
, struct caifsock
, sk
);
121 mutex_lock(&cf_sk
->readlock
);
124 static void caif_read_unlock(struct sock
*sk
)
126 struct caifsock
*cf_sk
;
127 cf_sk
= container_of(sk
, struct caifsock
, sk
);
128 mutex_unlock(&cf_sk
->readlock
);
131 static int sk_rcvbuf_lowwater(struct caifsock
*cf_sk
)
133 /* A quarter of full buffer is used a low water mark */
134 return cf_sk
->sk
.sk_rcvbuf
/ 4;
137 static void caif_flow_ctrl(struct sock
*sk
, int mode
)
139 struct caifsock
*cf_sk
;
140 cf_sk
= container_of(sk
, struct caifsock
, sk
);
141 if (cf_sk
->layer
.dn
&& cf_sk
->layer
.dn
->modemcmd
)
142 cf_sk
->layer
.dn
->modemcmd(cf_sk
->layer
.dn
, mode
);
146 * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
147 * not dropped, but CAIF is sending flow off instead.
149 static int caif_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
154 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
155 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
157 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
158 (unsigned)sk
->sk_rcvbuf
&& rx_flow_is_on(cf_sk
)) {
159 pr_debug("sending flow OFF (queue len = %d %d)\n",
160 atomic_read(&cf_sk
->sk
.sk_rmem_alloc
),
161 sk_rcvbuf_lowwater(cf_sk
));
162 set_rx_flow_off(cf_sk
);
163 dbfs_atomic_inc(&cnt
.num_rx_flow_off
);
164 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_OFF_REQ
);
167 err
= sk_filter(sk
, skb
);
170 if (!sk_rmem_schedule(sk
, skb
->truesize
) && rx_flow_is_on(cf_sk
)) {
171 set_rx_flow_off(cf_sk
);
172 pr_debug("sending flow OFF due to rmem_schedule\n");
173 dbfs_atomic_inc(&cnt
.num_rx_flow_off
);
174 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_OFF_REQ
);
177 skb_set_owner_r(skb
, sk
);
178 /* Cache the SKB length before we tack it onto the receive
179 * queue. Once it is added it no longer belongs to us and
180 * may be freed by other threads of control pulling packets
184 spin_lock_irqsave(&list
->lock
, flags
);
185 if (!sock_flag(sk
, SOCK_DEAD
))
186 __skb_queue_tail(list
, skb
);
187 spin_unlock_irqrestore(&list
->lock
, flags
);
189 if (!sock_flag(sk
, SOCK_DEAD
))
190 sk
->sk_data_ready(sk
, skb_len
);
196 /* Packet Receive Callback function called from CAIF Stack */
197 static int caif_sktrecv_cb(struct cflayer
*layr
, struct cfpkt
*pkt
)
199 struct caifsock
*cf_sk
;
202 cf_sk
= container_of(layr
, struct caifsock
, layer
);
203 skb
= cfpkt_tonative(pkt
);
205 if (unlikely(cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
)) {
209 caif_queue_rcv_skb(&cf_sk
->sk
, skb
);
213 /* Packet Control Callback function called from CAIF */
214 static void caif_ctrl_cb(struct cflayer
*layr
,
215 enum caif_ctrlcmd flow
,
218 struct caifsock
*cf_sk
= container_of(layr
, struct caifsock
, layer
);
220 case CAIF_CTRLCMD_FLOW_ON_IND
:
221 /* OK from modem to start sending again */
222 dbfs_atomic_inc(&cnt
.num_tx_flow_on_ind
);
223 set_tx_flow_on(cf_sk
);
224 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
227 case CAIF_CTRLCMD_FLOW_OFF_IND
:
228 /* Modem asks us to shut up */
229 dbfs_atomic_inc(&cnt
.num_tx_flow_off_ind
);
230 set_tx_flow_off(cf_sk
);
231 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
234 case CAIF_CTRLCMD_INIT_RSP
:
235 /* We're now connected */
236 dbfs_atomic_inc(&cnt
.num_connect_resp
);
237 cf_sk
->sk
.sk_state
= CAIF_CONNECTED
;
238 set_tx_flow_on(cf_sk
);
239 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
242 case CAIF_CTRLCMD_DEINIT_RSP
:
243 /* We're now disconnected */
244 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
245 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
246 cfcnfg_release_adap_layer(&cf_sk
->layer
);
249 case CAIF_CTRLCMD_INIT_FAIL_RSP
:
250 /* Connect request failed */
251 dbfs_atomic_inc(&cnt
.num_connect_fail_resp
);
252 cf_sk
->sk
.sk_err
= ECONNREFUSED
;
253 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
254 cf_sk
->sk
.sk_shutdown
= SHUTDOWN_MASK
;
256 * Socket "standards" seems to require POLLOUT to
257 * be set at connect failure.
259 set_tx_flow_on(cf_sk
);
260 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
263 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND
:
264 /* Modem has closed this connection, or device is down. */
265 dbfs_atomic_inc(&cnt
.num_remote_shutdown_ind
);
266 cf_sk
->sk
.sk_shutdown
= SHUTDOWN_MASK
;
267 cf_sk
->sk
.sk_err
= ECONNRESET
;
268 set_rx_flow_on(cf_sk
);
269 cf_sk
->sk
.sk_error_report(&cf_sk
->sk
);
273 pr_debug("Unexpected flow command %d\n", flow
);
277 static void caif_check_flow_release(struct sock
*sk
)
279 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
281 if (rx_flow_is_on(cf_sk
))
284 if (atomic_read(&sk
->sk_rmem_alloc
) <= sk_rcvbuf_lowwater(cf_sk
)) {
285 dbfs_atomic_inc(&cnt
.num_rx_flow_on
);
286 set_rx_flow_on(cf_sk
);
287 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_ON_REQ
);
292 * Copied from unix_dgram_recvmsg, but removed credit checks,
293 * changed locking, address handling and added MSG_TRUNC.
295 static int caif_seqpkt_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
296 struct msghdr
*m
, size_t len
, int flags
)
299 struct sock
*sk
= sock
->sk
;
305 if (m
->msg_flags
&MSG_OOB
)
308 skb
= skb_recv_datagram(sk
, flags
, 0 , &ret
);
313 m
->msg_flags
|= MSG_TRUNC
;
317 ret
= skb_copy_datagram_iovec(skb
, 0, m
->msg_iov
, copylen
);
321 ret
= (flags
& MSG_TRUNC
) ? skb
->len
: copylen
;
323 skb_free_datagram(sk
, skb
);
324 caif_check_flow_release(sk
);
332 /* Copied from unix_stream_wait_data, identical except for lock call. */
333 static long caif_stream_data_wait(struct sock
*sk
, long timeo
)
339 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
341 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
343 sk
->sk_state
!= CAIF_CONNECTED
||
344 sock_flag(sk
, SOCK_DEAD
) ||
345 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
346 signal_pending(current
) ||
350 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
352 timeo
= schedule_timeout(timeo
);
354 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
357 finish_wait(sk_sleep(sk
), &wait
);
364 * Copied from unix_stream_recvmsg, but removed credit checks,
365 * changed locking calls, changed address handling.
367 static int caif_stream_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
368 struct msghdr
*msg
, size_t size
,
371 struct sock
*sk
= sock
->sk
;
381 msg
->msg_namelen
= 0;
384 * Lock the socket to prevent queue disordering
385 * while sleeps in memcpy_tomsg
388 if (sk
->sk_state
== CAIF_CONNECTING
)
392 target
= sock_rcvlowat(sk
, flags
&MSG_WAITALL
, size
);
393 timeo
= sock_rcvtimeo(sk
, flags
&MSG_DONTWAIT
);
400 skb
= skb_dequeue(&sk
->sk_receive_queue
);
401 caif_check_flow_release(sk
);
404 if (copied
>= target
)
407 * POSIX 1003.1g mandates this order.
409 err
= sock_error(sk
);
413 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
417 if (sk
->sk_state
!= CAIF_CONNECTED
)
419 if (sock_flag(sk
, SOCK_DEAD
))
428 caif_read_unlock(sk
);
430 timeo
= caif_stream_data_wait(sk
, timeo
);
432 if (signal_pending(current
)) {
433 err
= sock_intr_errno(timeo
);
443 chunk
= min_t(unsigned int, skb
->len
, size
);
444 if (memcpy_toiovec(msg
->msg_iov
, skb
->data
, chunk
)) {
445 skb_queue_head(&sk
->sk_receive_queue
, skb
);
453 /* Mark read part of skb as used */
454 if (!(flags
& MSG_PEEK
)) {
455 skb_pull(skb
, chunk
);
457 /* put the skb back if we didn't use it up. */
459 skb_queue_head(&sk
->sk_receive_queue
, skb
);
466 * It is questionable, see note in unix_dgram_recvmsg.
468 /* put message back and return */
469 skb_queue_head(&sk
->sk_receive_queue
, skb
);
473 caif_read_unlock(sk
);
476 return copied
? : err
;
480 * Copied from sock.c:sock_wait_for_wmem, but change to wait for
481 * CAIF flow-on and sock_writable.
483 static long caif_wait_for_flow_on(struct caifsock
*cf_sk
,
484 int wait_writeable
, long timeo
, int *err
)
486 struct sock
*sk
= &cf_sk
->sk
;
490 if (tx_flow_is_on(cf_sk
) &&
491 (!wait_writeable
|| sock_writeable(&cf_sk
->sk
)))
497 if (signal_pending(current
))
499 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
501 if (sk
->sk_shutdown
& SHUTDOWN_MASK
)
507 if (cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
)
509 timeo
= schedule_timeout(timeo
);
511 finish_wait(sk_sleep(sk
), &wait
);
516 * Transmit a SKB. The device may temporarily request re-transmission
517 * by returning EAGAIN.
519 static int transmit_skb(struct sk_buff
*skb
, struct caifsock
*cf_sk
,
520 int noblock
, long timeo
)
523 int ret
, loopcnt
= 0;
525 pkt
= cfpkt_fromnative(CAIF_DIR_OUT
, skb
);
526 memset(cfpkt_info(pkt
), 0, sizeof(struct caif_payload_info
));
531 /* Slight paranoia, probably not needed. */
532 if (unlikely(loopcnt
++ > 1000)) {
533 pr_warn("transmit retries failed, error = %d\n", ret
);
537 if (cf_sk
->layer
.dn
!= NULL
)
538 ret
= cf_sk
->layer
.dn
->transmit(cf_sk
->layer
.dn
, pkt
);
539 if (likely(ret
>= 0))
541 /* if transmit return -EAGAIN, then retry */
542 if (noblock
&& ret
== -EAGAIN
)
544 timeo
= caif_wait_for_flow_on(cf_sk
, 0, timeo
, &ret
);
545 if (signal_pending(current
)) {
546 ret
= sock_intr_errno(timeo
);
551 if (cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
||
552 sock_flag(&cf_sk
->sk
, SOCK_DEAD
) ||
553 (cf_sk
->sk
.sk_shutdown
& RCV_SHUTDOWN
)) {
555 cf_sk
->sk
.sk_err
= EPIPE
;
558 } while (ret
== -EAGAIN
);
562 /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
563 static int caif_seqpkt_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
564 struct msghdr
*msg
, size_t len
)
566 struct sock
*sk
= sock
->sk
;
567 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
570 struct sk_buff
*skb
= NULL
;
574 ret
= sock_error(sk
);
579 if (msg
->msg_flags
&MSG_OOB
)
583 if (msg
->msg_namelen
)
587 if (unlikely(msg
->msg_iov
->iov_base
== NULL
))
589 noblock
= msg
->msg_flags
& MSG_DONTWAIT
;
591 timeo
= sock_sndtimeo(sk
, noblock
);
592 timeo
= caif_wait_for_flow_on(container_of(sk
, struct caifsock
, sk
),
598 if (cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
||
599 sock_flag(sk
, SOCK_DEAD
) ||
600 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
603 /* Error if trying to write more than maximum frame size. */
605 if (len
> cf_sk
->maxframe
&& cf_sk
->sk
.sk_protocol
!= CAIFPROTO_RFM
)
608 buffer_size
= len
+ cf_sk
->headroom
+ cf_sk
->tailroom
;
611 skb
= sock_alloc_send_skb(sk
, buffer_size
, noblock
, &ret
);
613 if (!skb
|| skb_tailroom(skb
) < buffer_size
)
616 skb_reserve(skb
, cf_sk
->headroom
);
618 ret
= memcpy_fromiovec(skb_put(skb
, len
), msg
->msg_iov
, len
);
622 ret
= transmit_skb(skb
, cf_sk
, noblock
, timeo
);
632 * Copied from unix_stream_sendmsg and adapted to CAIF:
633 * Changed removed permission handling and added waiting for flow on
634 * and other minor adaptations.
636 static int caif_stream_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
637 struct msghdr
*msg
, size_t len
)
639 struct sock
*sk
= sock
->sk
;
640 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
647 if (unlikely(msg
->msg_flags
&MSG_OOB
))
650 if (unlikely(msg
->msg_namelen
))
653 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
654 timeo
= caif_wait_for_flow_on(cf_sk
, 1, timeo
, &err
);
656 if (unlikely(sk
->sk_shutdown
& SEND_SHUTDOWN
))
663 if (size
> cf_sk
->maxframe
)
664 size
= cf_sk
->maxframe
;
666 /* If size is more than half of sndbuf, chop up message */
667 if (size
> ((sk
->sk_sndbuf
>> 1) - 64))
668 size
= (sk
->sk_sndbuf
>> 1) - 64;
670 if (size
> SKB_MAX_ALLOC
)
671 size
= SKB_MAX_ALLOC
;
673 skb
= sock_alloc_send_skb(sk
,
674 size
+ cf_sk
->headroom
+
676 msg
->msg_flags
&MSG_DONTWAIT
,
681 skb_reserve(skb
, cf_sk
->headroom
);
683 * If you pass two values to the sock_alloc_send_skb
684 * it tries to grab the large buffer with GFP_NOFS
685 * (which can fail easily), and if it fails grab the
686 * fallback size buffer which is under a page and will
689 size
= min_t(int, size
, skb_tailroom(skb
));
691 err
= memcpy_fromiovec(skb_put(skb
, size
), msg
->msg_iov
, size
);
696 err
= transmit_skb(skb
, cf_sk
,
697 msg
->msg_flags
&MSG_DONTWAIT
, timeo
);
708 if (sent
== 0 && !(msg
->msg_flags
&MSG_NOSIGNAL
))
709 send_sig(SIGPIPE
, current
, 0);
715 static int setsockopt(struct socket
*sock
,
716 int lvl
, int opt
, char __user
*ov
, unsigned int ol
)
718 struct sock
*sk
= sock
->sk
;
719 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
723 if (cf_sk
->sk
.sk_socket
->state
!= SS_UNCONNECTED
)
727 case CAIFSO_LINK_SELECT
:
728 if (ol
< sizeof(int))
732 if (copy_from_user(&linksel
, ov
, sizeof(int)))
734 lock_sock(&(cf_sk
->sk
));
735 cf_sk
->conn_req
.link_selector
= linksel
;
736 release_sock(&cf_sk
->sk
);
740 if (lvl
!= SOL_SOCKET
)
742 if (ol
< sizeof(int))
744 if (copy_from_user(&prio
, ov
, sizeof(int)))
746 lock_sock(&(cf_sk
->sk
));
747 cf_sk
->conn_req
.priority
= prio
;
748 release_sock(&cf_sk
->sk
);
751 case SO_BINDTODEVICE
:
752 if (lvl
!= SOL_SOCKET
)
754 if (ol
< sizeof(struct ifreq
))
756 if (copy_from_user(&ifreq
, ov
, sizeof(ifreq
)))
758 lock_sock(&(cf_sk
->sk
));
759 strncpy(cf_sk
->conn_req
.link_name
, ifreq
.ifr_name
,
760 sizeof(cf_sk
->conn_req
.link_name
));
761 cf_sk
->conn_req
.link_name
762 [sizeof(cf_sk
->conn_req
.link_name
)-1] = 0;
763 release_sock(&cf_sk
->sk
);
766 case CAIFSO_REQ_PARAM
:
769 if (cf_sk
->sk
.sk_protocol
!= CAIFPROTO_UTIL
)
771 lock_sock(&(cf_sk
->sk
));
772 cf_sk
->conn_req
.param
.size
= ol
;
773 if (ol
> sizeof(cf_sk
->conn_req
.param
.data
) ||
774 copy_from_user(&cf_sk
->conn_req
.param
.data
, ov
, ol
)) {
775 release_sock(&cf_sk
->sk
);
778 release_sock(&cf_sk
->sk
);
792 * caif_connect() - Connect a CAIF Socket
793 * Copied and modified af_irda.c:irda_connect().
795 * Note : by consulting "errno", the user space caller may learn the cause
796 * of the failure. Most of them are visible in the function, others may come
797 * from subroutines called and are listed here :
798 * o -EAFNOSUPPORT: bad socket family or type.
799 * o -ESOCKTNOSUPPORT: bad socket type or protocol
800 * o -EINVAL: bad socket address, or CAIF link type
801 * o -ECONNREFUSED: remote end refused the connection.
802 * o -EINPROGRESS: connect request sent but timed out (or non-blocking)
803 * o -EISCONN: already connected.
804 * o -ETIMEDOUT: Connection timed out (send timeout)
805 * o -ENODEV: No link layer to send request
806 * o -ECONNRESET: Received Shutdown indication or lost link layer
807 * o -ENOMEM: Out of memory
810 * o sk_state: holds the CAIF_* protocol state, it's updated by
812 * o sock->state: holds the SS_* socket state and is updated by connect and
815 static int caif_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
816 int addr_len
, int flags
)
818 struct sock
*sk
= sock
->sk
;
819 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
822 int ifindex
, headroom
, tailroom
;
823 struct net_device
*dev
;
828 if (uaddr
->sa_family
!= AF_CAIF
)
831 switch (sock
->state
) {
833 /* Normal case, a fresh connect */
834 caif_assert(sk
->sk_state
== CAIF_DISCONNECTED
);
837 switch (sk
->sk_state
) {
839 sock
->state
= SS_CONNECTED
;
842 case CAIF_DISCONNECTED
:
843 /* Reconnect allowed */
845 case CAIF_CONNECTING
:
847 if (flags
& O_NONBLOCK
)
853 caif_assert(sk
->sk_state
== CAIF_CONNECTED
||
854 sk
->sk_state
== CAIF_DISCONNECTED
);
855 if (sk
->sk_shutdown
& SHUTDOWN_MASK
) {
856 /* Allow re-connect after SHUTDOWN_IND */
857 caif_disconnect_client(&cf_sk
->layer
);
860 /* No reconnect on a seqpacket socket */
863 case SS_DISCONNECTING
:
865 caif_assert(1); /*Should never happen */
868 sk
->sk_state
= CAIF_DISCONNECTED
;
869 sock
->state
= SS_UNCONNECTED
;
870 sk_stream_kill_queues(&cf_sk
->sk
);
873 if (addr_len
!= sizeof(struct sockaddr_caif
))
876 memcpy(&cf_sk
->conn_req
.sockaddr
, uaddr
,
877 sizeof(struct sockaddr_caif
));
879 /* Move to connecting socket, start sending Connect Requests */
880 sock
->state
= SS_CONNECTING
;
881 sk
->sk_state
= CAIF_CONNECTING
;
883 dbfs_atomic_inc(&cnt
.num_connect_req
);
884 cf_sk
->layer
.receive
= caif_sktrecv_cb
;
885 err
= caif_connect_client(&cf_sk
->conn_req
,
886 &cf_sk
->layer
, &ifindex
, &headroom
, &tailroom
);
888 cf_sk
->sk
.sk_socket
->state
= SS_UNCONNECTED
;
889 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
892 dev
= dev_get_by_index(sock_net(sk
), ifindex
);
893 cf_sk
->headroom
= LL_RESERVED_SPACE_EXTRA(dev
, headroom
);
894 cf_sk
->tailroom
= tailroom
;
895 cf_sk
->maxframe
= dev
->mtu
- (headroom
+ tailroom
);
897 if (cf_sk
->maxframe
< 1) {
898 pr_warn("CAIF Interface MTU too small (%d)\n", dev
->mtu
);
906 if (sk
->sk_state
!= CAIF_CONNECTED
&& (flags
& O_NONBLOCK
))
909 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
913 timeo
= wait_event_interruptible_timeout(*sk_sleep(sk
),
914 sk
->sk_state
!= CAIF_CONNECTING
,
918 goto out
; /* -ERESTARTSYS */
921 if (timeo
== 0 && sk
->sk_state
!= CAIF_CONNECTED
)
923 if (sk
->sk_state
!= CAIF_CONNECTED
) {
924 sock
->state
= SS_UNCONNECTED
;
925 err
= sock_error(sk
);
930 sock
->state
= SS_CONNECTED
;
938 * caif_release() - Disconnect a CAIF Socket
939 * Copied and modified af_irda.c:irda_release().
941 static int caif_release(struct socket
*sock
)
943 struct sock
*sk
= sock
->sk
;
944 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
950 set_tx_flow_off(cf_sk
);
953 * Ensure that packets are not queued after this point in time.
954 * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
955 * this ensures no packets when sock is dead.
957 spin_lock(&sk
->sk_receive_queue
.lock
);
958 sock_set_flag(sk
, SOCK_DEAD
);
959 spin_unlock(&sk
->sk_receive_queue
.lock
);
962 dbfs_atomic_inc(&cnt
.num_disconnect
);
964 if (cf_sk
->debugfs_socket_dir
!= NULL
)
965 debugfs_remove_recursive(cf_sk
->debugfs_socket_dir
);
967 lock_sock(&(cf_sk
->sk
));
968 sk
->sk_state
= CAIF_DISCONNECTED
;
969 sk
->sk_shutdown
= SHUTDOWN_MASK
;
971 if (cf_sk
->sk
.sk_socket
->state
== SS_CONNECTED
||
972 cf_sk
->sk
.sk_socket
->state
== SS_CONNECTING
)
973 res
= caif_disconnect_client(&cf_sk
->layer
);
975 cf_sk
->sk
.sk_socket
->state
= SS_DISCONNECTING
;
976 wake_up_interruptible_poll(sk_sleep(sk
), POLLERR
|POLLHUP
);
979 cf_sk
->layer
.dn
= NULL
;
980 sk_stream_kill_queues(&cf_sk
->sk
);
986 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
987 static unsigned int caif_poll(struct file
*file
,
988 struct socket
*sock
, poll_table
*wait
)
990 struct sock
*sk
= sock
->sk
;
992 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
994 sock_poll_wait(file
, sk_sleep(sk
), wait
);
997 /* exceptional events? */
1000 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
1002 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
1006 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1007 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
1008 mask
|= POLLIN
| POLLRDNORM
;
1011 * we set writable also when the other side has shut down the
1012 * connection. This prevents stuck sockets.
1014 if (sock_writeable(sk
) && tx_flow_is_on(cf_sk
))
1015 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
1020 static const struct proto_ops caif_seqpacket_ops
= {
1022 .owner
= THIS_MODULE
,
1023 .release
= caif_release
,
1024 .bind
= sock_no_bind
,
1025 .connect
= caif_connect
,
1026 .socketpair
= sock_no_socketpair
,
1027 .accept
= sock_no_accept
,
1028 .getname
= sock_no_getname
,
1030 .ioctl
= sock_no_ioctl
,
1031 .listen
= sock_no_listen
,
1032 .shutdown
= sock_no_shutdown
,
1033 .setsockopt
= setsockopt
,
1034 .getsockopt
= sock_no_getsockopt
,
1035 .sendmsg
= caif_seqpkt_sendmsg
,
1036 .recvmsg
= caif_seqpkt_recvmsg
,
1037 .mmap
= sock_no_mmap
,
1038 .sendpage
= sock_no_sendpage
,
1041 static const struct proto_ops caif_stream_ops
= {
1043 .owner
= THIS_MODULE
,
1044 .release
= caif_release
,
1045 .bind
= sock_no_bind
,
1046 .connect
= caif_connect
,
1047 .socketpair
= sock_no_socketpair
,
1048 .accept
= sock_no_accept
,
1049 .getname
= sock_no_getname
,
1051 .ioctl
= sock_no_ioctl
,
1052 .listen
= sock_no_listen
,
1053 .shutdown
= sock_no_shutdown
,
1054 .setsockopt
= setsockopt
,
1055 .getsockopt
= sock_no_getsockopt
,
1056 .sendmsg
= caif_stream_sendmsg
,
1057 .recvmsg
= caif_stream_recvmsg
,
1058 .mmap
= sock_no_mmap
,
1059 .sendpage
= sock_no_sendpage
,
1062 /* This function is called when a socket is finally destroyed. */
1063 static void caif_sock_destructor(struct sock
*sk
)
1065 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
1066 caif_assert(!atomic_read(&sk
->sk_wmem_alloc
));
1067 caif_assert(sk_unhashed(sk
));
1068 caif_assert(!sk
->sk_socket
);
1069 if (!sock_flag(sk
, SOCK_DEAD
)) {
1070 pr_info("Attempt to release alive CAIF socket: %p\n", sk
);
1073 sk_stream_kill_queues(&cf_sk
->sk
);
1074 dbfs_atomic_dec(&cnt
.caif_nr_socks
);
1077 static int caif_create(struct net
*net
, struct socket
*sock
, int protocol
,
1080 struct sock
*sk
= NULL
;
1081 struct caifsock
*cf_sk
= NULL
;
1082 static struct proto prot
= {.name
= "PF_CAIF",
1083 .owner
= THIS_MODULE
,
1084 .obj_size
= sizeof(struct caifsock
),
1087 if (!capable(CAP_SYS_ADMIN
) && !capable(CAP_NET_ADMIN
))
1090 * The sock->type specifies the socket type to use.
1091 * The CAIF socket is a packet stream in the sense
1092 * that it is packet based. CAIF trusts the reliability
1093 * of the link, no resending is implemented.
1095 if (sock
->type
== SOCK_SEQPACKET
)
1096 sock
->ops
= &caif_seqpacket_ops
;
1097 else if (sock
->type
== SOCK_STREAM
)
1098 sock
->ops
= &caif_stream_ops
;
1100 return -ESOCKTNOSUPPORT
;
1102 if (protocol
< 0 || protocol
>= CAIFPROTO_MAX
)
1103 return -EPROTONOSUPPORT
;
1105 * Set the socket state to unconnected. The socket state
1106 * is really not used at all in the net/core or socket.c but the
1107 * initialization makes sure that sock->state is not uninitialized.
1109 sk
= sk_alloc(net
, PF_CAIF
, GFP_KERNEL
, &prot
);
1113 cf_sk
= container_of(sk
, struct caifsock
, sk
);
1115 /* Store the protocol */
1116 sk
->sk_protocol
= (unsigned char) protocol
;
1119 * Lock in order to try to stop someone from opening the socket
1122 lock_sock(&(cf_sk
->sk
));
1124 /* Initialize the nozero default sock structure data. */
1125 sock_init_data(sock
, sk
);
1126 sk
->sk_destruct
= caif_sock_destructor
;
1128 mutex_init(&cf_sk
->readlock
); /* single task reading lock */
1129 cf_sk
->layer
.ctrlcmd
= caif_ctrl_cb
;
1130 cf_sk
->sk
.sk_socket
->state
= SS_UNCONNECTED
;
1131 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
1133 set_tx_flow_off(cf_sk
);
1134 set_rx_flow_on(cf_sk
);
1136 /* Set default options on configuration */
1137 cf_sk
->conn_req
.priority
= CAIF_PRIO_NORMAL
;
1138 cf_sk
->conn_req
.link_selector
= CAIF_LINK_LOW_LATENCY
;
1139 cf_sk
->conn_req
.protocol
= protocol
;
1140 /* Increase the number of sockets created. */
1141 dbfs_atomic_inc(&cnt
.caif_nr_socks
);
1142 #ifdef CONFIG_DEBUG_FS
1143 if (!IS_ERR(debugfsdir
)) {
1144 /* Fill in some information concerning the misc socket. */
1145 snprintf(cf_sk
->name
, sizeof(cf_sk
->name
), "cfsk%d",
1146 atomic_read(&cnt
.caif_nr_socks
));
1148 cf_sk
->debugfs_socket_dir
=
1149 debugfs_create_dir(cf_sk
->name
, debugfsdir
);
1150 debugfs_create_u32("sk_state", S_IRUSR
| S_IWUSR
,
1151 cf_sk
->debugfs_socket_dir
,
1152 (u32
*) &cf_sk
->sk
.sk_state
);
1153 debugfs_create_u32("flow_state", S_IRUSR
| S_IWUSR
,
1154 cf_sk
->debugfs_socket_dir
, &cf_sk
->flow_state
);
1155 debugfs_create_u32("sk_rmem_alloc", S_IRUSR
| S_IWUSR
,
1156 cf_sk
->debugfs_socket_dir
,
1157 (u32
*) &cf_sk
->sk
.sk_rmem_alloc
);
1158 debugfs_create_u32("sk_wmem_alloc", S_IRUSR
| S_IWUSR
,
1159 cf_sk
->debugfs_socket_dir
,
1160 (u32
*) &cf_sk
->sk
.sk_wmem_alloc
);
1161 debugfs_create_u32("identity", S_IRUSR
| S_IWUSR
,
1162 cf_sk
->debugfs_socket_dir
,
1163 (u32
*) &cf_sk
->layer
.id
);
1166 release_sock(&cf_sk
->sk
);
1171 static struct net_proto_family caif_family_ops
= {
1173 .create
= caif_create
,
1174 .owner
= THIS_MODULE
,
1177 static int af_caif_init(void)
1179 int err
= sock_register(&caif_family_ops
);
1185 static int __init
caif_sktinit_module(void)
1187 #ifdef CONFIG_DEBUG_FS
1188 debugfsdir
= debugfs_create_dir("caif_sk", NULL
);
1189 if (!IS_ERR(debugfsdir
)) {
1190 debugfs_create_u32("num_sockets", S_IRUSR
| S_IWUSR
,
1192 (u32
*) &cnt
.caif_nr_socks
);
1193 debugfs_create_u32("num_connect_req", S_IRUSR
| S_IWUSR
,
1195 (u32
*) &cnt
.num_connect_req
);
1196 debugfs_create_u32("num_connect_resp", S_IRUSR
| S_IWUSR
,
1198 (u32
*) &cnt
.num_connect_resp
);
1199 debugfs_create_u32("num_connect_fail_resp", S_IRUSR
| S_IWUSR
,
1201 (u32
*) &cnt
.num_connect_fail_resp
);
1202 debugfs_create_u32("num_disconnect", S_IRUSR
| S_IWUSR
,
1204 (u32
*) &cnt
.num_disconnect
);
1205 debugfs_create_u32("num_remote_shutdown_ind",
1206 S_IRUSR
| S_IWUSR
, debugfsdir
,
1207 (u32
*) &cnt
.num_remote_shutdown_ind
);
1208 debugfs_create_u32("num_tx_flow_off_ind", S_IRUSR
| S_IWUSR
,
1210 (u32
*) &cnt
.num_tx_flow_off_ind
);
1211 debugfs_create_u32("num_tx_flow_on_ind", S_IRUSR
| S_IWUSR
,
1213 (u32
*) &cnt
.num_tx_flow_on_ind
);
1214 debugfs_create_u32("num_rx_flow_off", S_IRUSR
| S_IWUSR
,
1216 (u32
*) &cnt
.num_rx_flow_off
);
1217 debugfs_create_u32("num_rx_flow_on", S_IRUSR
| S_IWUSR
,
1219 (u32
*) &cnt
.num_rx_flow_on
);
1222 return af_caif_init();
1225 static void __exit
caif_sktexit_module(void)
1227 sock_unregister(PF_CAIF
);
1228 if (debugfsdir
!= NULL
)
1229 debugfs_remove_recursive(debugfsdir
);
1231 module_init(caif_sktinit_module
);
1232 module_exit(caif_sktexit_module
);