2 * Copyright (C) ST-Ericsson AB 2010
3 * Author: Sjur Brendeland
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/debugfs.h>
21 #include <linux/caif/caif_socket.h>
22 #include <linux/pkt_sched.h>
24 #include <net/tcp_states.h>
25 #include <net/caif/caif_layer.h>
26 #include <net/caif/caif_dev.h>
27 #include <net/caif/cfpkt.h>
29 MODULE_LICENSE("GPL");
30 MODULE_ALIAS_NETPROTO(AF_CAIF
);
33 * CAIF state is re-using the TCP socket states.
34 * caif_states stored in sk_state reflect the state as reported by
35 * the CAIF stack, while sk_socket->state is the state of the socket.
38 CAIF_CONNECTED
= TCP_ESTABLISHED
,
39 CAIF_CONNECTING
= TCP_SYN_SENT
,
40 CAIF_DISCONNECTED
= TCP_CLOSE
43 #define TX_FLOW_ON_BIT 1
44 #define RX_FLOW_ON_BIT 2
47 struct sock sk
; /* must be first member */
50 struct caif_connect_request conn_req
;
51 struct mutex readlock
;
52 struct dentry
*debugfs_socket_dir
;
53 int headroom
, tailroom
, maxframe
;
56 static int rx_flow_is_on(struct caifsock
*cf_sk
)
58 return test_bit(RX_FLOW_ON_BIT
,
59 (void *) &cf_sk
->flow_state
);
62 static int tx_flow_is_on(struct caifsock
*cf_sk
)
64 return test_bit(TX_FLOW_ON_BIT
,
65 (void *) &cf_sk
->flow_state
);
68 static void set_rx_flow_off(struct caifsock
*cf_sk
)
70 clear_bit(RX_FLOW_ON_BIT
,
71 (void *) &cf_sk
->flow_state
);
74 static void set_rx_flow_on(struct caifsock
*cf_sk
)
76 set_bit(RX_FLOW_ON_BIT
,
77 (void *) &cf_sk
->flow_state
);
80 static void set_tx_flow_off(struct caifsock
*cf_sk
)
82 clear_bit(TX_FLOW_ON_BIT
,
83 (void *) &cf_sk
->flow_state
);
86 static void set_tx_flow_on(struct caifsock
*cf_sk
)
88 set_bit(TX_FLOW_ON_BIT
,
89 (void *) &cf_sk
->flow_state
);
92 static void caif_read_lock(struct sock
*sk
)
94 struct caifsock
*cf_sk
;
95 cf_sk
= container_of(sk
, struct caifsock
, sk
);
96 mutex_lock(&cf_sk
->readlock
);
99 static void caif_read_unlock(struct sock
*sk
)
101 struct caifsock
*cf_sk
;
102 cf_sk
= container_of(sk
, struct caifsock
, sk
);
103 mutex_unlock(&cf_sk
->readlock
);
106 static int sk_rcvbuf_lowwater(struct caifsock
*cf_sk
)
108 /* A quarter of full buffer is used a low water mark */
109 return cf_sk
->sk
.sk_rcvbuf
/ 4;
112 static void caif_flow_ctrl(struct sock
*sk
, int mode
)
114 struct caifsock
*cf_sk
;
115 cf_sk
= container_of(sk
, struct caifsock
, sk
);
116 if (cf_sk
->layer
.dn
&& cf_sk
->layer
.dn
->modemcmd
)
117 cf_sk
->layer
.dn
->modemcmd(cf_sk
->layer
.dn
, mode
);
121 * Copied from sock.c:sock_queue_rcv_skb(), but changed so packets are
122 * not dropped, but CAIF is sending flow off instead.
124 static int caif_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
128 struct sk_buff_head
*list
= &sk
->sk_receive_queue
;
129 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
131 if (atomic_read(&sk
->sk_rmem_alloc
) + skb
->truesize
>=
132 (unsigned int)sk
->sk_rcvbuf
&& rx_flow_is_on(cf_sk
)) {
133 net_dbg_ratelimited("sending flow OFF (queue len = %d %d)\n",
134 atomic_read(&cf_sk
->sk
.sk_rmem_alloc
),
135 sk_rcvbuf_lowwater(cf_sk
));
136 set_rx_flow_off(cf_sk
);
137 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_OFF_REQ
);
140 err
= sk_filter(sk
, skb
);
143 if (!sk_rmem_schedule(sk
, skb
, skb
->truesize
) && rx_flow_is_on(cf_sk
)) {
144 set_rx_flow_off(cf_sk
);
145 net_dbg_ratelimited("sending flow OFF due to rmem_schedule\n");
146 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_OFF_REQ
);
149 skb_set_owner_r(skb
, sk
);
150 /* Cache the SKB length before we tack it onto the receive
151 * queue. Once it is added it no longer belongs to us and
152 * may be freed by other threads of control pulling packets
155 spin_lock_irqsave(&list
->lock
, flags
);
156 if (!sock_flag(sk
, SOCK_DEAD
))
157 __skb_queue_tail(list
, skb
);
158 spin_unlock_irqrestore(&list
->lock
, flags
);
160 if (!sock_flag(sk
, SOCK_DEAD
))
161 sk
->sk_data_ready(sk
);
167 /* Packet Receive Callback function called from CAIF Stack */
168 static int caif_sktrecv_cb(struct cflayer
*layr
, struct cfpkt
*pkt
)
170 struct caifsock
*cf_sk
;
173 cf_sk
= container_of(layr
, struct caifsock
, layer
);
174 skb
= cfpkt_tonative(pkt
);
176 if (unlikely(cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
)) {
180 caif_queue_rcv_skb(&cf_sk
->sk
, skb
);
184 static void cfsk_hold(struct cflayer
*layr
)
186 struct caifsock
*cf_sk
= container_of(layr
, struct caifsock
, layer
);
187 sock_hold(&cf_sk
->sk
);
190 static void cfsk_put(struct cflayer
*layr
)
192 struct caifsock
*cf_sk
= container_of(layr
, struct caifsock
, layer
);
193 sock_put(&cf_sk
->sk
);
196 /* Packet Control Callback function called from CAIF */
197 static void caif_ctrl_cb(struct cflayer
*layr
,
198 enum caif_ctrlcmd flow
,
201 struct caifsock
*cf_sk
= container_of(layr
, struct caifsock
, layer
);
203 case CAIF_CTRLCMD_FLOW_ON_IND
:
204 /* OK from modem to start sending again */
205 set_tx_flow_on(cf_sk
);
206 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
209 case CAIF_CTRLCMD_FLOW_OFF_IND
:
210 /* Modem asks us to shut up */
211 set_tx_flow_off(cf_sk
);
212 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
215 case CAIF_CTRLCMD_INIT_RSP
:
216 /* We're now connected */
217 caif_client_register_refcnt(&cf_sk
->layer
,
218 cfsk_hold
, cfsk_put
);
219 cf_sk
->sk
.sk_state
= CAIF_CONNECTED
;
220 set_tx_flow_on(cf_sk
);
221 cf_sk
->sk
.sk_shutdown
= 0;
222 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
225 case CAIF_CTRLCMD_DEINIT_RSP
:
226 /* We're now disconnected */
227 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
228 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
231 case CAIF_CTRLCMD_INIT_FAIL_RSP
:
232 /* Connect request failed */
233 cf_sk
->sk
.sk_err
= ECONNREFUSED
;
234 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
235 cf_sk
->sk
.sk_shutdown
= SHUTDOWN_MASK
;
237 * Socket "standards" seems to require POLLOUT to
238 * be set at connect failure.
240 set_tx_flow_on(cf_sk
);
241 cf_sk
->sk
.sk_state_change(&cf_sk
->sk
);
244 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND
:
245 /* Modem has closed this connection, or device is down. */
246 cf_sk
->sk
.sk_shutdown
= SHUTDOWN_MASK
;
247 cf_sk
->sk
.sk_err
= ECONNRESET
;
248 set_rx_flow_on(cf_sk
);
249 cf_sk
->sk
.sk_error_report(&cf_sk
->sk
);
253 pr_debug("Unexpected flow command %d\n", flow
);
257 static void caif_check_flow_release(struct sock
*sk
)
259 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
261 if (rx_flow_is_on(cf_sk
))
264 if (atomic_read(&sk
->sk_rmem_alloc
) <= sk_rcvbuf_lowwater(cf_sk
)) {
265 set_rx_flow_on(cf_sk
);
266 caif_flow_ctrl(sk
, CAIF_MODEMCMD_FLOW_ON_REQ
);
271 * Copied from unix_dgram_recvmsg, but removed credit checks,
272 * changed locking, address handling and added MSG_TRUNC.
274 static int caif_seqpkt_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
275 struct msghdr
*m
, size_t len
, int flags
)
278 struct sock
*sk
= sock
->sk
;
284 if (m
->msg_flags
&MSG_OOB
)
287 skb
= skb_recv_datagram(sk
, flags
, 0 , &ret
);
292 m
->msg_flags
|= MSG_TRUNC
;
296 ret
= skb_copy_datagram_msg(skb
, 0, m
, copylen
);
300 ret
= (flags
& MSG_TRUNC
) ? skb
->len
: copylen
;
302 skb_free_datagram(sk
, skb
);
303 caif_check_flow_release(sk
);
311 /* Copied from unix_stream_wait_data, identical except for lock call. */
312 static long caif_stream_data_wait(struct sock
*sk
, long timeo
)
318 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
320 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
322 sk
->sk_state
!= CAIF_CONNECTED
||
323 sock_flag(sk
, SOCK_DEAD
) ||
324 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
325 signal_pending(current
) ||
329 set_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
331 timeo
= schedule_timeout(timeo
);
333 clear_bit(SOCK_ASYNC_WAITDATA
, &sk
->sk_socket
->flags
);
336 finish_wait(sk_sleep(sk
), &wait
);
343 * Copied from unix_stream_recvmsg, but removed credit checks,
344 * changed locking calls, changed address handling.
346 static int caif_stream_recvmsg(struct kiocb
*iocb
, struct socket
*sock
,
347 struct msghdr
*msg
, size_t size
,
350 struct sock
*sk
= sock
->sk
;
361 * Lock the socket to prevent queue disordering
362 * while sleeps in memcpy_tomsg
365 if (sk
->sk_state
== CAIF_CONNECTING
)
369 target
= sock_rcvlowat(sk
, flags
&MSG_WAITALL
, size
);
370 timeo
= sock_rcvtimeo(sk
, flags
&MSG_DONTWAIT
);
377 skb
= skb_dequeue(&sk
->sk_receive_queue
);
378 caif_check_flow_release(sk
);
381 if (copied
>= target
)
384 * POSIX 1003.1g mandates this order.
386 err
= sock_error(sk
);
390 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
394 if (sk
->sk_state
!= CAIF_CONNECTED
)
396 if (sock_flag(sk
, SOCK_DEAD
))
405 caif_read_unlock(sk
);
407 timeo
= caif_stream_data_wait(sk
, timeo
);
409 if (signal_pending(current
)) {
410 err
= sock_intr_errno(timeo
);
420 chunk
= min_t(unsigned int, skb
->len
, size
);
421 if (memcpy_to_msg(msg
, skb
->data
, chunk
)) {
422 skb_queue_head(&sk
->sk_receive_queue
, skb
);
430 /* Mark read part of skb as used */
431 if (!(flags
& MSG_PEEK
)) {
432 skb_pull(skb
, chunk
);
434 /* put the skb back if we didn't use it up. */
436 skb_queue_head(&sk
->sk_receive_queue
, skb
);
443 * It is questionable, see note in unix_dgram_recvmsg.
445 /* put message back and return */
446 skb_queue_head(&sk
->sk_receive_queue
, skb
);
450 caif_read_unlock(sk
);
453 return copied
? : err
;
457 * Copied from sock.c:sock_wait_for_wmem, but change to wait for
458 * CAIF flow-on and sock_writable.
460 static long caif_wait_for_flow_on(struct caifsock
*cf_sk
,
461 int wait_writeable
, long timeo
, int *err
)
463 struct sock
*sk
= &cf_sk
->sk
;
467 if (tx_flow_is_on(cf_sk
) &&
468 (!wait_writeable
|| sock_writeable(&cf_sk
->sk
)))
474 if (signal_pending(current
))
476 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
478 if (sk
->sk_shutdown
& SHUTDOWN_MASK
)
484 if (cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
)
486 timeo
= schedule_timeout(timeo
);
488 finish_wait(sk_sleep(sk
), &wait
);
493 * Transmit a SKB. The device may temporarily request re-transmission
494 * by returning EAGAIN.
496 static int transmit_skb(struct sk_buff
*skb
, struct caifsock
*cf_sk
,
497 int noblock
, long timeo
)
501 pkt
= cfpkt_fromnative(CAIF_DIR_OUT
, skb
);
502 memset(skb
->cb
, 0, sizeof(struct caif_payload_info
));
503 cfpkt_set_prio(pkt
, cf_sk
->sk
.sk_priority
);
505 if (cf_sk
->layer
.dn
== NULL
) {
510 return cf_sk
->layer
.dn
->transmit(cf_sk
->layer
.dn
, pkt
);
513 /* Copied from af_unix:unix_dgram_sendmsg, and adapted to CAIF */
514 static int caif_seqpkt_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
515 struct msghdr
*msg
, size_t len
)
517 struct sock
*sk
= sock
->sk
;
518 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
521 struct sk_buff
*skb
= NULL
;
525 ret
= sock_error(sk
);
530 if (msg
->msg_flags
&MSG_OOB
)
534 if (msg
->msg_namelen
)
538 if (unlikely(msg
->msg_iter
.iov
->iov_base
== NULL
))
540 noblock
= msg
->msg_flags
& MSG_DONTWAIT
;
542 timeo
= sock_sndtimeo(sk
, noblock
);
543 timeo
= caif_wait_for_flow_on(container_of(sk
, struct caifsock
, sk
),
549 if (cf_sk
->sk
.sk_state
!= CAIF_CONNECTED
||
550 sock_flag(sk
, SOCK_DEAD
) ||
551 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
554 /* Error if trying to write more than maximum frame size. */
556 if (len
> cf_sk
->maxframe
&& cf_sk
->sk
.sk_protocol
!= CAIFPROTO_RFM
)
559 buffer_size
= len
+ cf_sk
->headroom
+ cf_sk
->tailroom
;
562 skb
= sock_alloc_send_skb(sk
, buffer_size
, noblock
, &ret
);
564 if (!skb
|| skb_tailroom(skb
) < buffer_size
)
567 skb_reserve(skb
, cf_sk
->headroom
);
569 ret
= memcpy_from_msg(skb_put(skb
, len
), msg
, len
);
573 ret
= transmit_skb(skb
, cf_sk
, noblock
, timeo
);
575 /* skb is already freed */
585 * Copied from unix_stream_sendmsg and adapted to CAIF:
586 * Changed removed permission handling and added waiting for flow on
587 * and other minor adaptations.
589 static int caif_stream_sendmsg(struct kiocb
*kiocb
, struct socket
*sock
,
590 struct msghdr
*msg
, size_t len
)
592 struct sock
*sk
= sock
->sk
;
593 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
600 if (unlikely(msg
->msg_flags
&MSG_OOB
))
603 if (unlikely(msg
->msg_namelen
))
606 timeo
= sock_sndtimeo(sk
, msg
->msg_flags
& MSG_DONTWAIT
);
607 timeo
= caif_wait_for_flow_on(cf_sk
, 1, timeo
, &err
);
609 if (unlikely(sk
->sk_shutdown
& SEND_SHUTDOWN
))
616 if (size
> cf_sk
->maxframe
)
617 size
= cf_sk
->maxframe
;
619 /* If size is more than half of sndbuf, chop up message */
620 if (size
> ((sk
->sk_sndbuf
>> 1) - 64))
621 size
= (sk
->sk_sndbuf
>> 1) - 64;
623 if (size
> SKB_MAX_ALLOC
)
624 size
= SKB_MAX_ALLOC
;
626 skb
= sock_alloc_send_skb(sk
,
627 size
+ cf_sk
->headroom
+
629 msg
->msg_flags
&MSG_DONTWAIT
,
634 skb_reserve(skb
, cf_sk
->headroom
);
636 * If you pass two values to the sock_alloc_send_skb
637 * it tries to grab the large buffer with GFP_NOFS
638 * (which can fail easily), and if it fails grab the
639 * fallback size buffer which is under a page and will
642 size
= min_t(int, size
, skb_tailroom(skb
));
644 err
= memcpy_from_msg(skb_put(skb
, size
), msg
, size
);
649 err
= transmit_skb(skb
, cf_sk
,
650 msg
->msg_flags
&MSG_DONTWAIT
, timeo
);
652 /* skb is already freed */
661 if (sent
== 0 && !(msg
->msg_flags
&MSG_NOSIGNAL
))
662 send_sig(SIGPIPE
, current
, 0);
668 static int setsockopt(struct socket
*sock
,
669 int lvl
, int opt
, char __user
*ov
, unsigned int ol
)
671 struct sock
*sk
= sock
->sk
;
672 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
675 if (cf_sk
->sk
.sk_socket
->state
!= SS_UNCONNECTED
)
679 case CAIFSO_LINK_SELECT
:
680 if (ol
< sizeof(int))
684 if (copy_from_user(&linksel
, ov
, sizeof(int)))
686 lock_sock(&(cf_sk
->sk
));
687 cf_sk
->conn_req
.link_selector
= linksel
;
688 release_sock(&cf_sk
->sk
);
691 case CAIFSO_REQ_PARAM
:
694 if (cf_sk
->sk
.sk_protocol
!= CAIFPROTO_UTIL
)
696 lock_sock(&(cf_sk
->sk
));
697 if (ol
> sizeof(cf_sk
->conn_req
.param
.data
) ||
698 copy_from_user(&cf_sk
->conn_req
.param
.data
, ov
, ol
)) {
699 release_sock(&cf_sk
->sk
);
702 cf_sk
->conn_req
.param
.size
= ol
;
703 release_sock(&cf_sk
->sk
);
717 * caif_connect() - Connect a CAIF Socket
718 * Copied and modified af_irda.c:irda_connect().
720 * Note : by consulting "errno", the user space caller may learn the cause
721 * of the failure. Most of them are visible in the function, others may come
722 * from subroutines called and are listed here :
723 * o -EAFNOSUPPORT: bad socket family or type.
724 * o -ESOCKTNOSUPPORT: bad socket type or protocol
725 * o -EINVAL: bad socket address, or CAIF link type
726 * o -ECONNREFUSED: remote end refused the connection.
727 * o -EINPROGRESS: connect request sent but timed out (or non-blocking)
728 * o -EISCONN: already connected.
729 * o -ETIMEDOUT: Connection timed out (send timeout)
730 * o -ENODEV: No link layer to send request
731 * o -ECONNRESET: Received Shutdown indication or lost link layer
732 * o -ENOMEM: Out of memory
735 * o sk_state: holds the CAIF_* protocol state, it's updated by
737 * o sock->state: holds the SS_* socket state and is updated by connect and
740 static int caif_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
741 int addr_len
, int flags
)
743 struct sock
*sk
= sock
->sk
;
744 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
747 int ifindex
, headroom
, tailroom
;
749 struct net_device
*dev
;
754 if (uaddr
->sa_family
!= AF_CAIF
)
757 switch (sock
->state
) {
759 /* Normal case, a fresh connect */
760 caif_assert(sk
->sk_state
== CAIF_DISCONNECTED
);
763 switch (sk
->sk_state
) {
765 sock
->state
= SS_CONNECTED
;
768 case CAIF_DISCONNECTED
:
769 /* Reconnect allowed */
771 case CAIF_CONNECTING
:
773 if (flags
& O_NONBLOCK
)
779 caif_assert(sk
->sk_state
== CAIF_CONNECTED
||
780 sk
->sk_state
== CAIF_DISCONNECTED
);
781 if (sk
->sk_shutdown
& SHUTDOWN_MASK
) {
782 /* Allow re-connect after SHUTDOWN_IND */
783 caif_disconnect_client(sock_net(sk
), &cf_sk
->layer
);
784 caif_free_client(&cf_sk
->layer
);
787 /* No reconnect on a seqpacket socket */
790 case SS_DISCONNECTING
:
792 caif_assert(1); /*Should never happen */
795 sk
->sk_state
= CAIF_DISCONNECTED
;
796 sock
->state
= SS_UNCONNECTED
;
797 sk_stream_kill_queues(&cf_sk
->sk
);
800 if (addr_len
!= sizeof(struct sockaddr_caif
))
803 memcpy(&cf_sk
->conn_req
.sockaddr
, uaddr
,
804 sizeof(struct sockaddr_caif
));
806 /* Move to connecting socket, start sending Connect Requests */
807 sock
->state
= SS_CONNECTING
;
808 sk
->sk_state
= CAIF_CONNECTING
;
810 /* Check priority value comming from socket */
811 /* if priority value is out of range it will be ajusted */
812 if (cf_sk
->sk
.sk_priority
> CAIF_PRIO_MAX
)
813 cf_sk
->conn_req
.priority
= CAIF_PRIO_MAX
;
814 else if (cf_sk
->sk
.sk_priority
< CAIF_PRIO_MIN
)
815 cf_sk
->conn_req
.priority
= CAIF_PRIO_MIN
;
817 cf_sk
->conn_req
.priority
= cf_sk
->sk
.sk_priority
;
819 /*ifindex = id of the interface.*/
820 cf_sk
->conn_req
.ifindex
= cf_sk
->sk
.sk_bound_dev_if
;
822 cf_sk
->layer
.receive
= caif_sktrecv_cb
;
824 err
= caif_connect_client(sock_net(sk
), &cf_sk
->conn_req
,
825 &cf_sk
->layer
, &ifindex
, &headroom
, &tailroom
);
828 cf_sk
->sk
.sk_socket
->state
= SS_UNCONNECTED
;
829 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
835 dev
= dev_get_by_index_rcu(sock_net(sk
), ifindex
);
840 cf_sk
->headroom
= LL_RESERVED_SPACE_EXTRA(dev
, headroom
);
844 cf_sk
->tailroom
= tailroom
;
845 cf_sk
->maxframe
= mtu
- (headroom
+ tailroom
);
846 if (cf_sk
->maxframe
< 1) {
847 pr_warn("CAIF Interface MTU too small (%d)\n", dev
->mtu
);
855 if (sk
->sk_state
!= CAIF_CONNECTED
&& (flags
& O_NONBLOCK
))
858 timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
862 timeo
= wait_event_interruptible_timeout(*sk_sleep(sk
),
863 sk
->sk_state
!= CAIF_CONNECTING
,
867 goto out
; /* -ERESTARTSYS */
870 if (timeo
== 0 && sk
->sk_state
!= CAIF_CONNECTED
)
872 if (sk
->sk_state
!= CAIF_CONNECTED
) {
873 sock
->state
= SS_UNCONNECTED
;
874 err
= sock_error(sk
);
879 sock
->state
= SS_CONNECTED
;
887 * caif_release() - Disconnect a CAIF Socket
888 * Copied and modified af_irda.c:irda_release().
890 static int caif_release(struct socket
*sock
)
892 struct sock
*sk
= sock
->sk
;
893 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
898 set_tx_flow_off(cf_sk
);
901 * Ensure that packets are not queued after this point in time.
902 * caif_queue_rcv_skb checks SOCK_DEAD holding the queue lock,
903 * this ensures no packets when sock is dead.
905 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
906 sock_set_flag(sk
, SOCK_DEAD
);
907 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
910 WARN_ON(IS_ERR(cf_sk
->debugfs_socket_dir
));
911 debugfs_remove_recursive(cf_sk
->debugfs_socket_dir
);
913 lock_sock(&(cf_sk
->sk
));
914 sk
->sk_state
= CAIF_DISCONNECTED
;
915 sk
->sk_shutdown
= SHUTDOWN_MASK
;
917 caif_disconnect_client(sock_net(sk
), &cf_sk
->layer
);
918 cf_sk
->sk
.sk_socket
->state
= SS_DISCONNECTING
;
919 wake_up_interruptible_poll(sk_sleep(sk
), POLLERR
|POLLHUP
);
922 sk_stream_kill_queues(&cf_sk
->sk
);
928 /* Copied from af_unix.c:unix_poll(), added CAIF tx_flow handling */
929 static unsigned int caif_poll(struct file
*file
,
930 struct socket
*sock
, poll_table
*wait
)
932 struct sock
*sk
= sock
->sk
;
934 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
936 sock_poll_wait(file
, sk_sleep(sk
), wait
);
939 /* exceptional events? */
942 if (sk
->sk_shutdown
== SHUTDOWN_MASK
)
944 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
948 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
949 (sk
->sk_shutdown
& RCV_SHUTDOWN
))
950 mask
|= POLLIN
| POLLRDNORM
;
953 * we set writable also when the other side has shut down the
954 * connection. This prevents stuck sockets.
956 if (sock_writeable(sk
) && tx_flow_is_on(cf_sk
))
957 mask
|= POLLOUT
| POLLWRNORM
| POLLWRBAND
;
962 static const struct proto_ops caif_seqpacket_ops
= {
964 .owner
= THIS_MODULE
,
965 .release
= caif_release
,
966 .bind
= sock_no_bind
,
967 .connect
= caif_connect
,
968 .socketpair
= sock_no_socketpair
,
969 .accept
= sock_no_accept
,
970 .getname
= sock_no_getname
,
972 .ioctl
= sock_no_ioctl
,
973 .listen
= sock_no_listen
,
974 .shutdown
= sock_no_shutdown
,
975 .setsockopt
= setsockopt
,
976 .getsockopt
= sock_no_getsockopt
,
977 .sendmsg
= caif_seqpkt_sendmsg
,
978 .recvmsg
= caif_seqpkt_recvmsg
,
979 .mmap
= sock_no_mmap
,
980 .sendpage
= sock_no_sendpage
,
983 static const struct proto_ops caif_stream_ops
= {
985 .owner
= THIS_MODULE
,
986 .release
= caif_release
,
987 .bind
= sock_no_bind
,
988 .connect
= caif_connect
,
989 .socketpair
= sock_no_socketpair
,
990 .accept
= sock_no_accept
,
991 .getname
= sock_no_getname
,
993 .ioctl
= sock_no_ioctl
,
994 .listen
= sock_no_listen
,
995 .shutdown
= sock_no_shutdown
,
996 .setsockopt
= setsockopt
,
997 .getsockopt
= sock_no_getsockopt
,
998 .sendmsg
= caif_stream_sendmsg
,
999 .recvmsg
= caif_stream_recvmsg
,
1000 .mmap
= sock_no_mmap
,
1001 .sendpage
= sock_no_sendpage
,
1004 /* This function is called when a socket is finally destroyed. */
1005 static void caif_sock_destructor(struct sock
*sk
)
1007 struct caifsock
*cf_sk
= container_of(sk
, struct caifsock
, sk
);
1008 caif_assert(!atomic_read(&sk
->sk_wmem_alloc
));
1009 caif_assert(sk_unhashed(sk
));
1010 caif_assert(!sk
->sk_socket
);
1011 if (!sock_flag(sk
, SOCK_DEAD
)) {
1012 pr_debug("Attempt to release alive CAIF socket: %p\n", sk
);
1015 sk_stream_kill_queues(&cf_sk
->sk
);
1016 caif_free_client(&cf_sk
->layer
);
1019 static int caif_create(struct net
*net
, struct socket
*sock
, int protocol
,
1022 struct sock
*sk
= NULL
;
1023 struct caifsock
*cf_sk
= NULL
;
1024 static struct proto prot
= {.name
= "PF_CAIF",
1025 .owner
= THIS_MODULE
,
1026 .obj_size
= sizeof(struct caifsock
),
1029 if (!capable(CAP_SYS_ADMIN
) && !capable(CAP_NET_ADMIN
))
1032 * The sock->type specifies the socket type to use.
1033 * The CAIF socket is a packet stream in the sense
1034 * that it is packet based. CAIF trusts the reliability
1035 * of the link, no resending is implemented.
1037 if (sock
->type
== SOCK_SEQPACKET
)
1038 sock
->ops
= &caif_seqpacket_ops
;
1039 else if (sock
->type
== SOCK_STREAM
)
1040 sock
->ops
= &caif_stream_ops
;
1042 return -ESOCKTNOSUPPORT
;
1044 if (protocol
< 0 || protocol
>= CAIFPROTO_MAX
)
1045 return -EPROTONOSUPPORT
;
1047 * Set the socket state to unconnected. The socket state
1048 * is really not used at all in the net/core or socket.c but the
1049 * initialization makes sure that sock->state is not uninitialized.
1051 sk
= sk_alloc(net
, PF_CAIF
, GFP_KERNEL
, &prot
);
1055 cf_sk
= container_of(sk
, struct caifsock
, sk
);
1057 /* Store the protocol */
1058 sk
->sk_protocol
= (unsigned char) protocol
;
1060 /* Initialize default priority for well-known cases */
1063 sk
->sk_priority
= TC_PRIO_CONTROL
;
1066 sk
->sk_priority
= TC_PRIO_INTERACTIVE_BULK
;
1069 sk
->sk_priority
= TC_PRIO_BESTEFFORT
;
1073 * Lock in order to try to stop someone from opening the socket
1076 lock_sock(&(cf_sk
->sk
));
1078 /* Initialize the nozero default sock structure data. */
1079 sock_init_data(sock
, sk
);
1080 sk
->sk_destruct
= caif_sock_destructor
;
1082 mutex_init(&cf_sk
->readlock
); /* single task reading lock */
1083 cf_sk
->layer
.ctrlcmd
= caif_ctrl_cb
;
1084 cf_sk
->sk
.sk_socket
->state
= SS_UNCONNECTED
;
1085 cf_sk
->sk
.sk_state
= CAIF_DISCONNECTED
;
1087 set_tx_flow_off(cf_sk
);
1088 set_rx_flow_on(cf_sk
);
1090 /* Set default options on configuration */
1091 cf_sk
->conn_req
.link_selector
= CAIF_LINK_LOW_LATENCY
;
1092 cf_sk
->conn_req
.protocol
= protocol
;
1093 release_sock(&cf_sk
->sk
);
1098 static struct net_proto_family caif_family_ops
= {
1100 .create
= caif_create
,
1101 .owner
= THIS_MODULE
,
1104 static int __init
caif_sktinit_module(void)
1106 int err
= sock_register(&caif_family_ops
);
1112 static void __exit
caif_sktexit_module(void)
1114 sock_unregister(PF_CAIF
);
1116 module_init(caif_sktinit_module
);
1117 module_exit(caif_sktexit_module
);