2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2015, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/rhashtable.h>
39 #include "name_table.h"
42 #include "name_distr.h"
46 #define SS_LISTENING -1 /* socket is listening */
47 #define SS_READY -2 /* socket is connectionless */
49 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
50 #define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */
51 #define TIPC_FWD_MSG 1
52 #define TIPC_CONN_OK 0
53 #define TIPC_CONN_PROBING 1
54 #define TIPC_MAX_PORT 0xffffffff
55 #define TIPC_MIN_PORT 1
58 * struct tipc_sock - TIPC socket structure
59 * @sk: socket - interacts with 'port' and with user via the socket API
60 * @connected: non-zero if port is currently connected to a peer port
61 * @conn_type: TIPC type used when connection was established
62 * @conn_instance: TIPC instance used when connection was established
63 * @published: non-zero if port has one or more associated names
64 * @max_pkt: maximum packet size "hint" used when building messages sent by port
65 * @portid: unique port identity in TIPC socket hash table
66 * @phdr: preformatted message header used when sending messages
67 * @port_list: adjacent ports in TIPC's global list of ports
68 * @publications: list of publications for port
69 * @pub_count: total # of publications port has made during its lifetime
72 * @conn_timeout: the time we can wait for an unresponded setup request
73 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
74 * @link_cong: non-zero if owner must sleep because of link congestion
75 * @sent_unacked: # messages sent by socket, and not yet acked by peer
76 * @rcv_unacked: # messages read by user, but not yet acked back to peer
77 * @remote: 'connected' peer for dgram/rdm
78 * @node: hash table node
79 * @rcu: rcu struct for tipc_sock
90 struct list_head sock_list
;
91 struct list_head publications
;
94 unsigned long probing_intv
;
100 struct sockaddr_tipc remote
;
101 struct rhash_head node
;
105 static int tipc_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
106 static void tipc_data_ready(struct sock
*sk
);
107 static void tipc_write_space(struct sock
*sk
);
108 static void tipc_sock_destruct(struct sock
*sk
);
109 static int tipc_release(struct socket
*sock
);
110 static int tipc_accept(struct socket
*sock
, struct socket
*new_sock
, int flags
);
111 static int tipc_wait_for_sndmsg(struct socket
*sock
, long *timeo_p
);
112 static void tipc_sk_timeout(unsigned long data
);
113 static int tipc_sk_publish(struct tipc_sock
*tsk
, uint scope
,
114 struct tipc_name_seq
const *seq
);
115 static int tipc_sk_withdraw(struct tipc_sock
*tsk
, uint scope
,
116 struct tipc_name_seq
const *seq
);
117 static struct tipc_sock
*tipc_sk_lookup(struct net
*net
, u32 portid
);
118 static int tipc_sk_insert(struct tipc_sock
*tsk
);
119 static void tipc_sk_remove(struct tipc_sock
*tsk
);
120 static int __tipc_send_stream(struct socket
*sock
, struct msghdr
*m
,
122 static int __tipc_sendmsg(struct socket
*sock
, struct msghdr
*m
, size_t dsz
);
124 static const struct proto_ops packet_ops
;
125 static const struct proto_ops stream_ops
;
126 static const struct proto_ops msg_ops
;
127 static struct proto tipc_proto
;
129 static const struct nla_policy tipc_nl_sock_policy
[TIPC_NLA_SOCK_MAX
+ 1] = {
130 [TIPC_NLA_SOCK_UNSPEC
] = { .type
= NLA_UNSPEC
},
131 [TIPC_NLA_SOCK_ADDR
] = { .type
= NLA_U32
},
132 [TIPC_NLA_SOCK_REF
] = { .type
= NLA_U32
},
133 [TIPC_NLA_SOCK_CON
] = { .type
= NLA_NESTED
},
134 [TIPC_NLA_SOCK_HAS_PUBL
] = { .type
= NLA_FLAG
}
137 static const struct rhashtable_params tsk_rht_params
;
140 * Revised TIPC socket locking policy:
142 * Most socket operations take the standard socket lock when they start
143 * and hold it until they finish (or until they need to sleep). Acquiring
144 * this lock grants the owner exclusive access to the fields of the socket
145 * data structures, with the exception of the backlog queue. A few socket
146 * operations can be done without taking the socket lock because they only
147 * read socket information that never changes during the life of the socket.
149 * Socket operations may acquire the lock for the associated TIPC port if they
150 * need to perform an operation on the port. If any routine needs to acquire
151 * both the socket lock and the port lock it must take the socket lock first
152 * to avoid the risk of deadlock.
154 * The dispatcher handling incoming messages cannot grab the socket lock in
155 * the standard fashion, since invoked it runs at the BH level and cannot block.
156 * Instead, it checks to see if the socket lock is currently owned by someone,
157 * and either handles the message itself or adds it to the socket's backlog
158 * queue; in the latter case the queued message is processed once the process
159 * owning the socket lock releases it.
161 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
162 * the problem of a blocked socket operation preventing any other operations
163 * from occurring. However, applications must be careful if they have
164 * multiple threads trying to send (or receive) on the same socket, as these
165 * operations might interfere with each other. For example, doing a connect
166 * and a receive at the same time might allow the receive to consume the
167 * ACK message meant for the connect. While additional work could be done
168 * to try and overcome this, it doesn't seem to be worthwhile at the present.
170 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
171 * that another operation that must be performed in a non-blocking manner is
172 * not delayed for very long because the lock has already been taken.
174 * NOTE: This code assumes that certain fields of a port/socket pair are
175 * constant over its lifetime; such fields can be examined without taking
176 * the socket lock and/or port lock, and do not need to be re-read even
177 * after resuming processing after waiting. These fields include:
179 * - pointer to socket sk structure (aka tipc_sock structure)
180 * - pointer to port structure
184 static u32
tsk_own_node(struct tipc_sock
*tsk
)
186 return msg_prevnode(&tsk
->phdr
);
189 static u32
tsk_peer_node(struct tipc_sock
*tsk
)
191 return msg_destnode(&tsk
->phdr
);
194 static u32
tsk_peer_port(struct tipc_sock
*tsk
)
196 return msg_destport(&tsk
->phdr
);
199 static bool tsk_unreliable(struct tipc_sock
*tsk
)
201 return msg_src_droppable(&tsk
->phdr
) != 0;
204 static void tsk_set_unreliable(struct tipc_sock
*tsk
, bool unreliable
)
206 msg_set_src_droppable(&tsk
->phdr
, unreliable
? 1 : 0);
209 static bool tsk_unreturnable(struct tipc_sock
*tsk
)
211 return msg_dest_droppable(&tsk
->phdr
) != 0;
214 static void tsk_set_unreturnable(struct tipc_sock
*tsk
, bool unreturnable
)
216 msg_set_dest_droppable(&tsk
->phdr
, unreturnable
? 1 : 0);
219 static int tsk_importance(struct tipc_sock
*tsk
)
221 return msg_importance(&tsk
->phdr
);
224 static int tsk_set_importance(struct tipc_sock
*tsk
, int imp
)
226 if (imp
> TIPC_CRITICAL_IMPORTANCE
)
228 msg_set_importance(&tsk
->phdr
, (u32
)imp
);
232 static struct tipc_sock
*tipc_sk(const struct sock
*sk
)
234 return container_of(sk
, struct tipc_sock
, sk
);
237 static int tsk_conn_cong(struct tipc_sock
*tsk
)
239 return tsk
->sent_unacked
>= TIPC_FLOWCTRL_WIN
;
243 * tsk_advance_rx_queue - discard first buffer in socket receive queue
245 * Caller must hold socket lock
247 static void tsk_advance_rx_queue(struct sock
*sk
)
249 kfree_skb(__skb_dequeue(&sk
->sk_receive_queue
));
252 /* tipc_sk_respond() : send response message back to sender
254 static void tipc_sk_respond(struct sock
*sk
, struct sk_buff
*skb
, int err
)
258 u32 onode
= tipc_own_addr(sock_net(sk
));
260 if (!tipc_msg_reverse(onode
, &skb
, err
))
263 dnode
= msg_destnode(buf_msg(skb
));
264 selector
= msg_origport(buf_msg(skb
));
265 tipc_node_xmit_skb(sock_net(sk
), skb
, dnode
, selector
);
269 * tsk_rej_rx_queue - reject all buffers in socket receive queue
271 * Caller must hold socket lock
273 static void tsk_rej_rx_queue(struct sock
*sk
)
277 while ((skb
= __skb_dequeue(&sk
->sk_receive_queue
)))
278 tipc_sk_respond(sk
, skb
, TIPC_ERR_NO_PORT
);
281 /* tsk_peer_msg - verify if message was sent by connected port's peer
283 * Handles cases where the node's network address has changed from
284 * the default of <0.0.0> to its configured setting.
286 static bool tsk_peer_msg(struct tipc_sock
*tsk
, struct tipc_msg
*msg
)
288 struct tipc_net
*tn
= net_generic(sock_net(&tsk
->sk
), tipc_net_id
);
289 u32 peer_port
= tsk_peer_port(tsk
);
293 if (unlikely(!tsk
->connected
))
296 if (unlikely(msg_origport(msg
) != peer_port
))
299 orig_node
= msg_orignode(msg
);
300 peer_node
= tsk_peer_node(tsk
);
302 if (likely(orig_node
== peer_node
))
305 if (!orig_node
&& (peer_node
== tn
->own_addr
))
308 if (!peer_node
&& (orig_node
== tn
->own_addr
))
315 * tipc_sk_create - create a TIPC socket
316 * @net: network namespace (must be default network)
317 * @sock: pre-allocated socket structure
318 * @protocol: protocol indicator (must be 0)
319 * @kern: caused by kernel or by userspace?
321 * This routine creates additional data structures used by the TIPC socket,
322 * initializes them, and links them together.
324 * Returns 0 on success, errno otherwise
326 static int tipc_sk_create(struct net
*net
, struct socket
*sock
,
327 int protocol
, int kern
)
330 const struct proto_ops
*ops
;
333 struct tipc_sock
*tsk
;
334 struct tipc_msg
*msg
;
336 /* Validate arguments */
337 if (unlikely(protocol
!= 0))
338 return -EPROTONOSUPPORT
;
340 switch (sock
->type
) {
343 state
= SS_UNCONNECTED
;
347 state
= SS_UNCONNECTED
;
358 /* Allocate socket's protocol area */
359 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
, kern
);
364 tsk
->max_pkt
= MAX_PKT_DEFAULT
;
365 INIT_LIST_HEAD(&tsk
->publications
);
367 tn
= net_generic(sock_net(sk
), tipc_net_id
);
368 tipc_msg_init(tn
->own_addr
, msg
, TIPC_LOW_IMPORTANCE
, TIPC_NAMED_MSG
,
371 /* Finish initializing socket data structures */
374 sock_init_data(sock
, sk
);
375 if (tipc_sk_insert(tsk
)) {
376 pr_warn("Socket create failed; port numbrer exhausted\n");
379 msg_set_origport(msg
, tsk
->portid
);
380 setup_timer(&sk
->sk_timer
, tipc_sk_timeout
, (unsigned long)tsk
);
381 sk
->sk_backlog_rcv
= tipc_backlog_rcv
;
382 sk
->sk_rcvbuf
= sysctl_tipc_rmem
[1];
383 sk
->sk_data_ready
= tipc_data_ready
;
384 sk
->sk_write_space
= tipc_write_space
;
385 sk
->sk_destruct
= tipc_sock_destruct
;
386 tsk
->conn_timeout
= CONN_TIMEOUT_DEFAULT
;
387 tsk
->sent_unacked
= 0;
388 atomic_set(&tsk
->dupl_rcvcnt
, 0);
390 if (sock
->state
== SS_READY
) {
391 tsk_set_unreturnable(tsk
, true);
392 if (sock
->type
== SOCK_DGRAM
)
393 tsk_set_unreliable(tsk
, true);
398 static void tipc_sk_callback(struct rcu_head
*head
)
400 struct tipc_sock
*tsk
= container_of(head
, struct tipc_sock
, rcu
);
406 * tipc_release - destroy a TIPC socket
407 * @sock: socket to destroy
409 * This routine cleans up any messages that are still queued on the socket.
410 * For DGRAM and RDM socket types, all queued messages are rejected.
411 * For SEQPACKET and STREAM socket types, the first message is rejected
412 * and any others are discarded. (If the first message on a STREAM socket
413 * is partially-read, it is discarded and the next one is rejected instead.)
415 * NOTE: Rejected messages are not necessarily returned to the sender! They
416 * are returned or discarded according to the "destination droppable" setting
417 * specified for the message by the sender.
419 * Returns 0 on success, errno otherwise
421 static int tipc_release(struct socket
*sock
)
423 struct sock
*sk
= sock
->sk
;
425 struct tipc_sock
*tsk
;
430 * Exit if socket isn't fully initialized (occurs when a failed accept()
431 * releases a pre-allocated child socket that was never used)
441 * Reject all unreceived messages, except on an active connection
442 * (which disconnects locally & sends a 'FIN+' to peer)
444 dnode
= tsk_peer_node(tsk
);
445 while (sock
->state
!= SS_DISCONNECTING
) {
446 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
449 if (TIPC_SKB_CB(skb
)->handle
!= NULL
)
452 if ((sock
->state
== SS_CONNECTING
) ||
453 (sock
->state
== SS_CONNECTED
)) {
454 sock
->state
= SS_DISCONNECTING
;
456 tipc_node_remove_conn(net
, dnode
, tsk
->portid
);
458 tipc_sk_respond(sk
, skb
, TIPC_ERR_NO_PORT
);
462 tipc_sk_withdraw(tsk
, 0, NULL
);
463 sk_stop_timer(sk
, &sk
->sk_timer
);
465 if (tsk
->connected
) {
466 skb
= tipc_msg_create(TIPC_CRITICAL_IMPORTANCE
,
467 TIPC_CONN_MSG
, SHORT_H_SIZE
, 0, dnode
,
468 tsk_own_node(tsk
), tsk_peer_port(tsk
),
469 tsk
->portid
, TIPC_ERR_NO_PORT
);
471 tipc_node_xmit_skb(net
, skb
, dnode
, tsk
->portid
);
472 tipc_node_remove_conn(net
, dnode
, tsk
->portid
);
475 /* Reject any messages that accumulated in backlog queue */
476 sock
->state
= SS_DISCONNECTING
;
479 call_rcu(&tsk
->rcu
, tipc_sk_callback
);
486 * tipc_bind - associate or disassocate TIPC name(s) with a socket
487 * @sock: socket structure
488 * @uaddr: socket address describing name(s) and desired operation
489 * @uaddr_len: size of socket address data structure
491 * Name and name sequence binding is indicated using a positive scope value;
492 * a negative scope value unbinds the specified name. Specifying no name
493 * (i.e. a socket address length of 0) unbinds all names from the socket.
495 * Returns 0 on success, errno otherwise
497 * NOTE: This routine doesn't need to take the socket lock since it doesn't
498 * access any non-constant socket information.
500 static int tipc_bind(struct socket
*sock
, struct sockaddr
*uaddr
,
503 struct sock
*sk
= sock
->sk
;
504 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
505 struct tipc_sock
*tsk
= tipc_sk(sk
);
509 if (unlikely(!uaddr_len
)) {
510 res
= tipc_sk_withdraw(tsk
, 0, NULL
);
514 if (uaddr_len
< sizeof(struct sockaddr_tipc
)) {
518 if (addr
->family
!= AF_TIPC
) {
523 if (addr
->addrtype
== TIPC_ADDR_NAME
)
524 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
525 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
) {
530 if ((addr
->addr
.nameseq
.type
< TIPC_RESERVED_TYPES
) &&
531 (addr
->addr
.nameseq
.type
!= TIPC_TOP_SRV
) &&
532 (addr
->addr
.nameseq
.type
!= TIPC_CFG_SRV
)) {
537 res
= (addr
->scope
> 0) ?
538 tipc_sk_publish(tsk
, addr
->scope
, &addr
->addr
.nameseq
) :
539 tipc_sk_withdraw(tsk
, -addr
->scope
, &addr
->addr
.nameseq
);
546 * tipc_getname - get port ID of socket or peer socket
547 * @sock: socket structure
548 * @uaddr: area for returned socket address
549 * @uaddr_len: area for returned length of socket address
550 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
552 * Returns 0 on success, errno otherwise
554 * NOTE: This routine doesn't need to take the socket lock since it only
555 * accesses socket information that is unchanging (or which changes in
556 * a completely predictable manner).
558 static int tipc_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
559 int *uaddr_len
, int peer
)
561 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
562 struct tipc_sock
*tsk
= tipc_sk(sock
->sk
);
563 struct tipc_net
*tn
= net_generic(sock_net(sock
->sk
), tipc_net_id
);
565 memset(addr
, 0, sizeof(*addr
));
567 if ((sock
->state
!= SS_CONNECTED
) &&
568 ((peer
!= 2) || (sock
->state
!= SS_DISCONNECTING
)))
570 addr
->addr
.id
.ref
= tsk_peer_port(tsk
);
571 addr
->addr
.id
.node
= tsk_peer_node(tsk
);
573 addr
->addr
.id
.ref
= tsk
->portid
;
574 addr
->addr
.id
.node
= tn
->own_addr
;
577 *uaddr_len
= sizeof(*addr
);
578 addr
->addrtype
= TIPC_ADDR_ID
;
579 addr
->family
= AF_TIPC
;
581 addr
->addr
.name
.domain
= 0;
587 * tipc_poll - read and possibly block on pollmask
588 * @file: file structure associated with the socket
589 * @sock: socket for which to calculate the poll bits
592 * Returns pollmask value
595 * It appears that the usual socket locking mechanisms are not useful here
596 * since the pollmask info is potentially out-of-date the moment this routine
597 * exits. TCP and other protocols seem to rely on higher level poll routines
598 * to handle any preventable race conditions, so TIPC will do the same ...
600 * TIPC sets the returned events as follows:
602 * socket state flags set
603 * ------------ ---------
604 * unconnected no read flags
605 * POLLOUT if port is not congested
607 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
610 * connected POLLIN/POLLRDNORM if data in rx queue
611 * POLLOUT if port is not congested
613 * disconnecting POLLIN/POLLRDNORM/POLLHUP
616 * listening POLLIN if SYN in rx queue
619 * ready POLLIN/POLLRDNORM if data in rx queue
620 * [connectionless] POLLOUT (since port cannot be congested)
622 * IMPORTANT: The fact that a read or write operation is indicated does NOT
623 * imply that the operation will succeed, merely that it should be performed
624 * and will not block.
626 static unsigned int tipc_poll(struct file
*file
, struct socket
*sock
,
629 struct sock
*sk
= sock
->sk
;
630 struct tipc_sock
*tsk
= tipc_sk(sk
);
633 sock_poll_wait(file
, sk_sleep(sk
), wait
);
635 switch ((int)sock
->state
) {
642 if (!tsk
->link_cong
&& !tsk_conn_cong(tsk
))
647 if (!skb_queue_empty(&sk
->sk_receive_queue
))
648 mask
|= (POLLIN
| POLLRDNORM
);
650 case SS_DISCONNECTING
:
651 mask
= (POLLIN
| POLLRDNORM
| POLLHUP
);
659 * tipc_sendmcast - send multicast message
660 * @sock: socket structure
661 * @seq: destination address
662 * @msg: message to send
663 * @dsz: total length of message data
664 * @timeo: timeout to wait for wakeup
666 * Called from function tipc_sendmsg(), which has done all sanity checks
667 * Returns the number of bytes sent on success, or errno
669 static int tipc_sendmcast(struct socket
*sock
, struct tipc_name_seq
*seq
,
670 struct msghdr
*msg
, size_t dsz
, long timeo
)
672 struct sock
*sk
= sock
->sk
;
673 struct tipc_sock
*tsk
= tipc_sk(sk
);
674 struct net
*net
= sock_net(sk
);
675 struct tipc_msg
*mhdr
= &tsk
->phdr
;
676 struct sk_buff_head pktchain
;
677 struct iov_iter save
= msg
->msg_iter
;
681 msg_set_type(mhdr
, TIPC_MCAST_MSG
);
682 msg_set_lookup_scope(mhdr
, TIPC_CLUSTER_SCOPE
);
683 msg_set_destport(mhdr
, 0);
684 msg_set_destnode(mhdr
, 0);
685 msg_set_nametype(mhdr
, seq
->type
);
686 msg_set_namelower(mhdr
, seq
->lower
);
687 msg_set_nameupper(mhdr
, seq
->upper
);
688 msg_set_hdr_sz(mhdr
, MCAST_H_SIZE
);
690 skb_queue_head_init(&pktchain
);
693 mtu
= tipc_bcast_get_mtu(net
);
694 rc
= tipc_msg_build(mhdr
, msg
, 0, dsz
, mtu
, &pktchain
);
695 if (unlikely(rc
< 0))
699 rc
= tipc_bcast_xmit(net
, &pktchain
);
703 if (rc
== -ELINKCONG
) {
705 rc
= tipc_wait_for_sndmsg(sock
, &timeo
);
709 __skb_queue_purge(&pktchain
);
710 if (rc
== -EMSGSIZE
) {
711 msg
->msg_iter
= save
;
720 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
721 * @arrvq: queue with arriving messages, to be cloned after destination lookup
722 * @inputq: queue with cloned messages, delivered to socket after dest lookup
724 * Multi-threaded: parallel calls with reference to same queues may occur
726 void tipc_sk_mcast_rcv(struct net
*net
, struct sk_buff_head
*arrvq
,
727 struct sk_buff_head
*inputq
)
729 struct tipc_msg
*msg
;
730 struct tipc_plist dports
;
732 u32 scope
= TIPC_CLUSTER_SCOPE
;
733 struct sk_buff_head tmpq
;
735 struct sk_buff
*skb
, *_skb
;
737 __skb_queue_head_init(&tmpq
);
738 tipc_plist_init(&dports
);
740 skb
= tipc_skb_peek(arrvq
, &inputq
->lock
);
741 for (; skb
; skb
= tipc_skb_peek(arrvq
, &inputq
->lock
)) {
743 hsz
= skb_headroom(skb
) + msg_hdr_sz(msg
);
745 if (in_own_node(net
, msg_orignode(msg
)))
746 scope
= TIPC_NODE_SCOPE
;
748 /* Create destination port list and message clones: */
749 tipc_nametbl_mc_translate(net
,
750 msg_nametype(msg
), msg_namelower(msg
),
751 msg_nameupper(msg
), scope
, &dports
);
752 portid
= tipc_plist_pop(&dports
);
753 for (; portid
; portid
= tipc_plist_pop(&dports
)) {
754 _skb
= __pskb_copy(skb
, hsz
, GFP_ATOMIC
);
756 msg_set_destport(buf_msg(_skb
), portid
);
757 __skb_queue_tail(&tmpq
, _skb
);
760 pr_warn("Failed to clone mcast rcv buffer\n");
762 /* Append to inputq if not already done by other thread */
763 spin_lock_bh(&inputq
->lock
);
764 if (skb_peek(arrvq
) == skb
) {
765 skb_queue_splice_tail_init(&tmpq
, inputq
);
766 kfree_skb(__skb_dequeue(arrvq
));
768 spin_unlock_bh(&inputq
->lock
);
769 __skb_queue_purge(&tmpq
);
772 tipc_sk_rcv(net
, inputq
);
776 * tipc_sk_proto_rcv - receive a connection mng protocol message
777 * @tsk: receiving socket
778 * @skb: pointer to message buffer.
780 static void tipc_sk_proto_rcv(struct tipc_sock
*tsk
, struct sk_buff
*skb
)
782 struct sock
*sk
= &tsk
->sk
;
783 struct tipc_msg
*hdr
= buf_msg(skb
);
784 int mtyp
= msg_type(hdr
);
787 /* Ignore if connection cannot be validated: */
788 if (!tsk_peer_msg(tsk
, hdr
))
791 tsk
->probing_state
= TIPC_CONN_OK
;
793 if (mtyp
== CONN_PROBE
) {
794 msg_set_type(hdr
, CONN_PROBE_REPLY
);
795 tipc_sk_respond(sk
, skb
, TIPC_OK
);
797 } else if (mtyp
== CONN_ACK
) {
798 conn_cong
= tsk_conn_cong(tsk
);
799 tsk
->sent_unacked
-= msg_msgcnt(hdr
);
801 sk
->sk_write_space(sk
);
802 } else if (mtyp
!= CONN_PROBE_REPLY
) {
803 pr_warn("Received unknown CONN_PROTO msg\n");
809 static int tipc_wait_for_sndmsg(struct socket
*sock
, long *timeo_p
)
811 struct sock
*sk
= sock
->sk
;
812 struct tipc_sock
*tsk
= tipc_sk(sk
);
817 int err
= sock_error(sk
);
820 if (sock
->state
== SS_DISCONNECTING
)
824 if (signal_pending(current
))
825 return sock_intr_errno(*timeo_p
);
827 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
828 done
= sk_wait_event(sk
, timeo_p
, !tsk
->link_cong
);
829 finish_wait(sk_sleep(sk
), &wait
);
835 * tipc_sendmsg - send message in connectionless manner
836 * @sock: socket structure
837 * @m: message to send
838 * @dsz: amount of user data to be sent
840 * Message must have an destination specified explicitly.
841 * Used for SOCK_RDM and SOCK_DGRAM messages,
842 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
843 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
845 * Returns the number of bytes sent on success, or errno otherwise
847 static int tipc_sendmsg(struct socket
*sock
,
848 struct msghdr
*m
, size_t dsz
)
850 struct sock
*sk
= sock
->sk
;
854 ret
= __tipc_sendmsg(sock
, m
, dsz
);
860 static int __tipc_sendmsg(struct socket
*sock
, struct msghdr
*m
, size_t dsz
)
862 DECLARE_SOCKADDR(struct sockaddr_tipc
*, dest
, m
->msg_name
);
863 struct sock
*sk
= sock
->sk
;
864 struct tipc_sock
*tsk
= tipc_sk(sk
);
865 struct net
*net
= sock_net(sk
);
866 struct tipc_msg
*mhdr
= &tsk
->phdr
;
868 struct sk_buff_head pktchain
;
870 struct tipc_name_seq
*seq
;
871 struct iov_iter save
;
876 if (dsz
> TIPC_MAX_USER_MSG_SIZE
)
878 if (unlikely(!dest
)) {
879 if (tsk
->connected
&& sock
->state
== SS_READY
)
882 return -EDESTADDRREQ
;
883 } else if (unlikely(m
->msg_namelen
< sizeof(*dest
)) ||
884 dest
->family
!= AF_TIPC
) {
887 if (unlikely(sock
->state
!= SS_READY
)) {
888 if (sock
->state
== SS_LISTENING
)
890 if (sock
->state
!= SS_UNCONNECTED
)
894 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
895 tsk
->conn_type
= dest
->addr
.name
.name
.type
;
896 tsk
->conn_instance
= dest
->addr
.name
.name
.instance
;
899 seq
= &dest
->addr
.nameseq
;
900 timeo
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
902 if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
903 return tipc_sendmcast(sock
, seq
, m
, dsz
, timeo
);
904 } else if (dest
->addrtype
== TIPC_ADDR_NAME
) {
905 u32 type
= dest
->addr
.name
.name
.type
;
906 u32 inst
= dest
->addr
.name
.name
.instance
;
907 u32 domain
= dest
->addr
.name
.domain
;
910 msg_set_type(mhdr
, TIPC_NAMED_MSG
);
911 msg_set_hdr_sz(mhdr
, NAMED_H_SIZE
);
912 msg_set_nametype(mhdr
, type
);
913 msg_set_nameinst(mhdr
, inst
);
914 msg_set_lookup_scope(mhdr
, tipc_addr_scope(domain
));
915 dport
= tipc_nametbl_translate(net
, type
, inst
, &dnode
);
916 msg_set_destnode(mhdr
, dnode
);
917 msg_set_destport(mhdr
, dport
);
918 if (unlikely(!dport
&& !dnode
))
919 return -EHOSTUNREACH
;
920 } else if (dest
->addrtype
== TIPC_ADDR_ID
) {
921 dnode
= dest
->addr
.id
.node
;
922 msg_set_type(mhdr
, TIPC_DIRECT_MSG
);
923 msg_set_lookup_scope(mhdr
, 0);
924 msg_set_destnode(mhdr
, dnode
);
925 msg_set_destport(mhdr
, dest
->addr
.id
.ref
);
926 msg_set_hdr_sz(mhdr
, BASIC_H_SIZE
);
929 skb_queue_head_init(&pktchain
);
932 mtu
= tipc_node_get_mtu(net
, dnode
, tsk
->portid
);
933 rc
= tipc_msg_build(mhdr
, m
, 0, dsz
, mtu
, &pktchain
);
938 skb
= skb_peek(&pktchain
);
939 TIPC_SKB_CB(skb
)->wakeup_pending
= tsk
->link_cong
;
940 rc
= tipc_node_xmit(net
, &pktchain
, dnode
, tsk
->portid
);
942 if (sock
->state
!= SS_READY
)
943 sock
->state
= SS_CONNECTING
;
946 if (rc
== -ELINKCONG
) {
948 rc
= tipc_wait_for_sndmsg(sock
, &timeo
);
952 __skb_queue_purge(&pktchain
);
953 if (rc
== -EMSGSIZE
) {
963 static int tipc_wait_for_sndpkt(struct socket
*sock
, long *timeo_p
)
965 struct sock
*sk
= sock
->sk
;
966 struct tipc_sock
*tsk
= tipc_sk(sk
);
971 int err
= sock_error(sk
);
974 if (sock
->state
== SS_DISCONNECTING
)
976 else if (sock
->state
!= SS_CONNECTED
)
980 if (signal_pending(current
))
981 return sock_intr_errno(*timeo_p
);
983 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
984 done
= sk_wait_event(sk
, timeo_p
,
986 !tsk_conn_cong(tsk
)) ||
988 finish_wait(sk_sleep(sk
), &wait
);
994 * tipc_send_stream - send stream-oriented data
995 * @sock: socket structure
997 * @dsz: total length of data to be transmitted
999 * Used for SOCK_STREAM data.
1001 * Returns the number of bytes sent on success (or partial success),
1002 * or errno if no data sent
1004 static int tipc_send_stream(struct socket
*sock
, struct msghdr
*m
, size_t dsz
)
1006 struct sock
*sk
= sock
->sk
;
1010 ret
= __tipc_send_stream(sock
, m
, dsz
);
1016 static int __tipc_send_stream(struct socket
*sock
, struct msghdr
*m
, size_t dsz
)
1018 struct sock
*sk
= sock
->sk
;
1019 struct net
*net
= sock_net(sk
);
1020 struct tipc_sock
*tsk
= tipc_sk(sk
);
1021 struct tipc_msg
*mhdr
= &tsk
->phdr
;
1022 struct sk_buff_head pktchain
;
1023 DECLARE_SOCKADDR(struct sockaddr_tipc
*, dest
, m
->msg_name
);
1024 u32 portid
= tsk
->portid
;
1028 uint mtu
, send
, sent
= 0;
1029 struct iov_iter save
;
1031 /* Handle implied connection establishment */
1032 if (unlikely(dest
)) {
1033 rc
= __tipc_sendmsg(sock
, m
, dsz
);
1034 if (dsz
&& (dsz
== rc
))
1035 tsk
->sent_unacked
= 1;
1038 if (dsz
> (uint
)INT_MAX
)
1041 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
1042 if (sock
->state
== SS_DISCONNECTING
)
1048 timeo
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
1049 dnode
= tsk_peer_node(tsk
);
1050 skb_queue_head_init(&pktchain
);
1055 send
= min_t(uint
, dsz
- sent
, TIPC_MAX_USER_MSG_SIZE
);
1056 rc
= tipc_msg_build(mhdr
, m
, sent
, send
, mtu
, &pktchain
);
1057 if (unlikely(rc
< 0))
1061 if (likely(!tsk_conn_cong(tsk
))) {
1062 rc
= tipc_node_xmit(net
, &pktchain
, dnode
, portid
);
1064 tsk
->sent_unacked
++;
1070 if (rc
== -EMSGSIZE
) {
1071 __skb_queue_purge(&pktchain
);
1072 tsk
->max_pkt
= tipc_node_get_mtu(net
, dnode
,
1077 if (rc
!= -ELINKCONG
)
1082 rc
= tipc_wait_for_sndpkt(sock
, &timeo
);
1085 __skb_queue_purge(&pktchain
);
1086 return sent
? sent
: rc
;
1090 * tipc_send_packet - send a connection-oriented message
1091 * @sock: socket structure
1092 * @m: message to send
1093 * @dsz: length of data to be transmitted
1095 * Used for SOCK_SEQPACKET messages.
1097 * Returns the number of bytes sent on success, or errno otherwise
1099 static int tipc_send_packet(struct socket
*sock
, struct msghdr
*m
, size_t dsz
)
1101 if (dsz
> TIPC_MAX_USER_MSG_SIZE
)
1104 return tipc_send_stream(sock
, m
, dsz
);
1107 /* tipc_sk_finish_conn - complete the setup of a connection
1109 static void tipc_sk_finish_conn(struct tipc_sock
*tsk
, u32 peer_port
,
1112 struct sock
*sk
= &tsk
->sk
;
1113 struct net
*net
= sock_net(sk
);
1114 struct tipc_msg
*msg
= &tsk
->phdr
;
1116 msg_set_destnode(msg
, peer_node
);
1117 msg_set_destport(msg
, peer_port
);
1118 msg_set_type(msg
, TIPC_CONN_MSG
);
1119 msg_set_lookup_scope(msg
, 0);
1120 msg_set_hdr_sz(msg
, SHORT_H_SIZE
);
1122 tsk
->probing_intv
= CONN_PROBING_INTERVAL
;
1123 tsk
->probing_state
= TIPC_CONN_OK
;
1125 sk_reset_timer(sk
, &sk
->sk_timer
, jiffies
+ tsk
->probing_intv
);
1126 tipc_node_add_conn(net
, peer_node
, tsk
->portid
, peer_port
);
1127 tsk
->max_pkt
= tipc_node_get_mtu(net
, peer_node
, tsk
->portid
);
1131 * set_orig_addr - capture sender's address for received message
1132 * @m: descriptor for message info
1133 * @msg: received message header
1135 * Note: Address is not captured if not requested by receiver.
1137 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
1139 DECLARE_SOCKADDR(struct sockaddr_tipc
*, addr
, m
->msg_name
);
1142 addr
->family
= AF_TIPC
;
1143 addr
->addrtype
= TIPC_ADDR_ID
;
1144 memset(&addr
->addr
, 0, sizeof(addr
->addr
));
1145 addr
->addr
.id
.ref
= msg_origport(msg
);
1146 addr
->addr
.id
.node
= msg_orignode(msg
);
1147 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
1148 addr
->scope
= 0; /* could leave uninitialized */
1149 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
1154 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1155 * @m: descriptor for message info
1156 * @msg: received message header
1157 * @tsk: TIPC port associated with message
1159 * Note: Ancillary data is not captured if not requested by receiver.
1161 * Returns 0 if successful, otherwise errno
1163 static int tipc_sk_anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
1164 struct tipc_sock
*tsk
)
1172 if (likely(m
->msg_controllen
== 0))
1175 /* Optionally capture errored message object(s) */
1176 err
= msg
? msg_errcode(msg
) : 0;
1177 if (unlikely(err
)) {
1179 anc_data
[1] = msg_data_sz(msg
);
1180 res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
);
1184 res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
1191 /* Optionally capture message destination object */
1192 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
1193 switch (dest_type
) {
1194 case TIPC_NAMED_MSG
:
1196 anc_data
[0] = msg_nametype(msg
);
1197 anc_data
[1] = msg_namelower(msg
);
1198 anc_data
[2] = msg_namelower(msg
);
1200 case TIPC_MCAST_MSG
:
1202 anc_data
[0] = msg_nametype(msg
);
1203 anc_data
[1] = msg_namelower(msg
);
1204 anc_data
[2] = msg_nameupper(msg
);
1207 has_name
= (tsk
->conn_type
!= 0);
1208 anc_data
[0] = tsk
->conn_type
;
1209 anc_data
[1] = tsk
->conn_instance
;
1210 anc_data
[2] = tsk
->conn_instance
;
1216 res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
);
1224 static void tipc_sk_send_ack(struct tipc_sock
*tsk
, uint ack
)
1226 struct net
*net
= sock_net(&tsk
->sk
);
1227 struct sk_buff
*skb
= NULL
;
1228 struct tipc_msg
*msg
;
1229 u32 peer_port
= tsk_peer_port(tsk
);
1230 u32 dnode
= tsk_peer_node(tsk
);
1232 if (!tsk
->connected
)
1234 skb
= tipc_msg_create(CONN_MANAGER
, CONN_ACK
, INT_H_SIZE
, 0,
1235 dnode
, tsk_own_node(tsk
), peer_port
,
1236 tsk
->portid
, TIPC_OK
);
1240 msg_set_msgcnt(msg
, ack
);
1241 tipc_node_xmit_skb(net
, skb
, dnode
, msg_link_selector(msg
));
1244 static int tipc_wait_for_rcvmsg(struct socket
*sock
, long *timeop
)
1246 struct sock
*sk
= sock
->sk
;
1248 long timeo
= *timeop
;
1252 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1253 if (timeo
&& skb_queue_empty(&sk
->sk_receive_queue
)) {
1254 if (sock
->state
== SS_DISCONNECTING
) {
1259 timeo
= schedule_timeout(timeo
);
1263 if (!skb_queue_empty(&sk
->sk_receive_queue
))
1268 err
= sock_intr_errno(timeo
);
1269 if (signal_pending(current
))
1272 finish_wait(sk_sleep(sk
), &wait
);
1278 * tipc_recvmsg - receive packet-oriented message
1279 * @m: descriptor for message info
1280 * @buf_len: total size of user buffer area
1281 * @flags: receive flags
1283 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1284 * If the complete message doesn't fit in user area, truncate it.
1286 * Returns size of returned message data, errno otherwise
1288 static int tipc_recvmsg(struct socket
*sock
, struct msghdr
*m
, size_t buf_len
,
1291 struct sock
*sk
= sock
->sk
;
1292 struct tipc_sock
*tsk
= tipc_sk(sk
);
1293 struct sk_buff
*buf
;
1294 struct tipc_msg
*msg
;
1300 /* Catch invalid receive requests */
1301 if (unlikely(!buf_len
))
1306 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
1311 timeo
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1314 /* Look for a message in receive queue; wait if necessary */
1315 res
= tipc_wait_for_rcvmsg(sock
, &timeo
);
1319 /* Look at first message in receive queue */
1320 buf
= skb_peek(&sk
->sk_receive_queue
);
1322 sz
= msg_data_sz(msg
);
1323 err
= msg_errcode(msg
);
1325 /* Discard an empty non-errored message & try again */
1326 if ((!sz
) && (!err
)) {
1327 tsk_advance_rx_queue(sk
);
1331 /* Capture sender's address (optional) */
1332 set_orig_addr(m
, msg
);
1334 /* Capture ancillary data (optional) */
1335 res
= tipc_sk_anc_data_recv(m
, msg
, tsk
);
1339 /* Capture message data (if valid) & compute return value (always) */
1341 if (unlikely(buf_len
< sz
)) {
1343 m
->msg_flags
|= MSG_TRUNC
;
1345 res
= skb_copy_datagram_msg(buf
, msg_hdr_sz(msg
), m
, sz
);
1350 if ((sock
->state
== SS_READY
) ||
1351 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
1357 /* Consume received message (optional) */
1358 if (likely(!(flags
& MSG_PEEK
))) {
1359 if ((sock
->state
!= SS_READY
) &&
1360 (++tsk
->rcv_unacked
>= TIPC_CONNACK_INTV
)) {
1361 tipc_sk_send_ack(tsk
, tsk
->rcv_unacked
);
1362 tsk
->rcv_unacked
= 0;
1364 tsk_advance_rx_queue(sk
);
1372 * tipc_recv_stream - receive stream-oriented data
1373 * @m: descriptor for message info
1374 * @buf_len: total size of user buffer area
1375 * @flags: receive flags
1377 * Used for SOCK_STREAM messages only. If not enough data is available
1378 * will optionally wait for more; never truncates data.
1380 * Returns size of returned message data, errno otherwise
1382 static int tipc_recv_stream(struct socket
*sock
, struct msghdr
*m
,
1383 size_t buf_len
, int flags
)
1385 struct sock
*sk
= sock
->sk
;
1386 struct tipc_sock
*tsk
= tipc_sk(sk
);
1387 struct sk_buff
*buf
;
1388 struct tipc_msg
*msg
;
1391 int sz_to_copy
, target
, needed
;
1396 /* Catch invalid receive attempts */
1397 if (unlikely(!buf_len
))
1402 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
1407 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, buf_len
);
1408 timeo
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1411 /* Look for a message in receive queue; wait if necessary */
1412 res
= tipc_wait_for_rcvmsg(sock
, &timeo
);
1416 /* Look at first message in receive queue */
1417 buf
= skb_peek(&sk
->sk_receive_queue
);
1419 sz
= msg_data_sz(msg
);
1420 err
= msg_errcode(msg
);
1422 /* Discard an empty non-errored message & try again */
1423 if ((!sz
) && (!err
)) {
1424 tsk_advance_rx_queue(sk
);
1428 /* Optionally capture sender's address & ancillary data of first msg */
1429 if (sz_copied
== 0) {
1430 set_orig_addr(m
, msg
);
1431 res
= tipc_sk_anc_data_recv(m
, msg
, tsk
);
1436 /* Capture message data (if valid) & compute return value (always) */
1438 u32 offset
= (u32
)(unsigned long)(TIPC_SKB_CB(buf
)->handle
);
1441 needed
= (buf_len
- sz_copied
);
1442 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1444 res
= skb_copy_datagram_msg(buf
, msg_hdr_sz(msg
) + offset
,
1449 sz_copied
+= sz_to_copy
;
1451 if (sz_to_copy
< sz
) {
1452 if (!(flags
& MSG_PEEK
))
1453 TIPC_SKB_CB(buf
)->handle
=
1454 (void *)(unsigned long)(offset
+ sz_to_copy
);
1459 goto exit
; /* can't add error msg to valid data */
1461 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1467 /* Consume received message (optional) */
1468 if (likely(!(flags
& MSG_PEEK
))) {
1469 if (unlikely(++tsk
->rcv_unacked
>= TIPC_CONNACK_INTV
)) {
1470 tipc_sk_send_ack(tsk
, tsk
->rcv_unacked
);
1471 tsk
->rcv_unacked
= 0;
1473 tsk_advance_rx_queue(sk
);
1476 /* Loop around if more data is required */
1477 if ((sz_copied
< buf_len
) && /* didn't get all requested data */
1478 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1479 (sz_copied
< target
)) && /* and more is ready or required */
1480 (!(flags
& MSG_PEEK
)) && /* and aren't just peeking at data */
1481 (!err
)) /* and haven't reached a FIN */
1486 return sz_copied
? sz_copied
: res
;
1490 * tipc_write_space - wake up thread if port congestion is released
1493 static void tipc_write_space(struct sock
*sk
)
1495 struct socket_wq
*wq
;
1498 wq
= rcu_dereference(sk
->sk_wq
);
1499 if (skwq_has_sleeper(wq
))
1500 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
1501 POLLWRNORM
| POLLWRBAND
);
1506 * tipc_data_ready - wake up threads to indicate messages have been received
1508 * @len: the length of messages
1510 static void tipc_data_ready(struct sock
*sk
)
1512 struct socket_wq
*wq
;
1515 wq
= rcu_dereference(sk
->sk_wq
);
1516 if (skwq_has_sleeper(wq
))
1517 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
1518 POLLRDNORM
| POLLRDBAND
);
1522 static void tipc_sock_destruct(struct sock
*sk
)
1524 __skb_queue_purge(&sk
->sk_receive_queue
);
1528 * filter_connect - Handle all incoming messages for a connection-based socket
1530 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1532 * Returns true if everything ok, false otherwise
1534 static bool filter_connect(struct tipc_sock
*tsk
, struct sk_buff
*skb
)
1536 struct sock
*sk
= &tsk
->sk
;
1537 struct net
*net
= sock_net(sk
);
1538 struct socket
*sock
= sk
->sk_socket
;
1539 struct tipc_msg
*hdr
= buf_msg(skb
);
1541 if (unlikely(msg_mcast(hdr
)))
1544 switch ((int)sock
->state
) {
1547 /* Accept only connection-based messages sent by peer */
1548 if (unlikely(!tsk_peer_msg(tsk
, hdr
)))
1551 if (unlikely(msg_errcode(hdr
))) {
1552 sock
->state
= SS_DISCONNECTING
;
1554 /* Let timer expire on it's own */
1555 tipc_node_remove_conn(net
, tsk_peer_node(tsk
),
1562 /* Accept only ACK or NACK message */
1563 if (unlikely(!msg_connected(hdr
)))
1566 if (unlikely(msg_errcode(hdr
))) {
1567 sock
->state
= SS_DISCONNECTING
;
1568 sk
->sk_err
= ECONNREFUSED
;
1572 if (unlikely(!msg_isdata(hdr
))) {
1573 sock
->state
= SS_DISCONNECTING
;
1574 sk
->sk_err
= EINVAL
;
1578 tipc_sk_finish_conn(tsk
, msg_origport(hdr
), msg_orignode(hdr
));
1579 msg_set_importance(&tsk
->phdr
, msg_importance(hdr
));
1580 sock
->state
= SS_CONNECTED
;
1582 /* If 'ACK+' message, add to socket receive queue */
1583 if (msg_data_sz(hdr
))
1586 /* If empty 'ACK-' message, wake up sleeping connect() */
1587 if (waitqueue_active(sk_sleep(sk
)))
1588 wake_up_interruptible(sk_sleep(sk
));
1590 /* 'ACK-' message is neither accepted nor rejected: */
1591 msg_set_dest_droppable(hdr
, 1);
1595 case SS_UNCONNECTED
:
1597 /* Accept only SYN message */
1598 if (!msg_connected(hdr
) && !(msg_errcode(hdr
)))
1601 case SS_DISCONNECTING
:
1604 pr_err("Unknown socket state %u\n", sock
->state
);
1610 * rcvbuf_limit - get proper overload limit of socket receive queue
1614 * For all connection oriented messages, irrespective of importance,
1615 * the default overload value (i.e. 67MB) is set as limit.
1617 * For all connectionless messages, by default new queue limits are
1620 * TIPC_LOW_IMPORTANCE (4 MB)
1621 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1622 * TIPC_HIGH_IMPORTANCE (16 MB)
1623 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1625 * Returns overload limit according to corresponding message importance
1627 static unsigned int rcvbuf_limit(struct sock
*sk
, struct sk_buff
*buf
)
1629 struct tipc_msg
*msg
= buf_msg(buf
);
1631 if (msg_connected(msg
))
1632 return sysctl_tipc_rmem
[2];
1634 return sk
->sk_rcvbuf
>> TIPC_CRITICAL_IMPORTANCE
<<
1635 msg_importance(msg
);
1639 * filter_rcv - validate incoming message
1641 * @skb: pointer to message.
1643 * Enqueues message on receive queue if acceptable; optionally handles
1644 * disconnect indication for a connected socket.
1646 * Called with socket lock already taken
1648 * Returns true if message was added to socket receive queue, otherwise false
1650 static bool filter_rcv(struct sock
*sk
, struct sk_buff
*skb
)
1652 struct socket
*sock
= sk
->sk_socket
;
1653 struct tipc_sock
*tsk
= tipc_sk(sk
);
1654 struct tipc_msg
*hdr
= buf_msg(skb
);
1655 unsigned int limit
= rcvbuf_limit(sk
, skb
);
1657 int usr
= msg_user(hdr
);
1659 if (unlikely(msg_user(hdr
) == CONN_MANAGER
)) {
1660 tipc_sk_proto_rcv(tsk
, skb
);
1664 if (unlikely(usr
== SOCK_WAKEUP
)) {
1667 sk
->sk_write_space(sk
);
1671 /* Drop if illegal message type */
1672 if (unlikely(msg_type(hdr
) > TIPC_DIRECT_MSG
)) {
1677 /* Reject if wrong message type for current socket state */
1678 if (unlikely(sock
->state
== SS_READY
)) {
1679 if (msg_connected(hdr
)) {
1680 err
= TIPC_ERR_NO_PORT
;
1683 } else if (unlikely(!filter_connect(tsk
, skb
))) {
1684 err
= TIPC_ERR_NO_PORT
;
1688 /* Reject message if there isn't room to queue it */
1689 if (unlikely(sk_rmem_alloc_get(sk
) + skb
->truesize
>= limit
)) {
1690 err
= TIPC_ERR_OVERLOAD
;
1694 /* Enqueue message */
1695 TIPC_SKB_CB(skb
)->handle
= NULL
;
1696 __skb_queue_tail(&sk
->sk_receive_queue
, skb
);
1697 skb_set_owner_r(skb
, sk
);
1699 sk
->sk_data_ready(sk
);
1703 tipc_sk_respond(sk
, skb
, err
);
1708 * tipc_backlog_rcv - handle incoming message from backlog queue
1712 * Caller must hold socket lock
1716 static int tipc_backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
)
1718 unsigned int truesize
= skb
->truesize
;
1720 if (likely(filter_rcv(sk
, skb
)))
1721 atomic_add(truesize
, &tipc_sk(sk
)->dupl_rcvcnt
);
1726 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1727 * inputq and try adding them to socket or backlog queue
1728 * @inputq: list of incoming buffers with potentially different destinations
1729 * @sk: socket where the buffers should be enqueued
1730 * @dport: port number for the socket
1732 * Caller must hold socket lock
1734 static void tipc_sk_enqueue(struct sk_buff_head
*inputq
, struct sock
*sk
,
1739 struct sk_buff
*skb
;
1740 unsigned long time_limit
= jiffies
+ 2;
1742 while (skb_queue_len(inputq
)) {
1743 if (unlikely(time_after_eq(jiffies
, time_limit
)))
1746 skb
= tipc_skb_dequeue(inputq
, dport
);
1750 /* Add message directly to receive queue if possible */
1751 if (!sock_owned_by_user(sk
)) {
1752 filter_rcv(sk
, skb
);
1756 /* Try backlog, compensating for double-counted bytes */
1757 dcnt
= &tipc_sk(sk
)->dupl_rcvcnt
;
1758 if (sk
->sk_backlog
.len
)
1759 atomic_set(dcnt
, 0);
1760 lim
= rcvbuf_limit(sk
, skb
) + atomic_read(dcnt
);
1761 if (likely(!sk_add_backlog(sk
, skb
, lim
)))
1764 /* Overload => reject message back to sender */
1765 tipc_sk_respond(sk
, skb
, TIPC_ERR_OVERLOAD
);
1771 * tipc_sk_rcv - handle a chain of incoming buffers
1772 * @inputq: buffer list containing the buffers
1773 * Consumes all buffers in list until inputq is empty
1774 * Note: may be called in multiple threads referring to the same queue
1776 void tipc_sk_rcv(struct net
*net
, struct sk_buff_head
*inputq
)
1778 u32 dnode
, dport
= 0;
1780 struct tipc_sock
*tsk
;
1782 struct sk_buff
*skb
;
1784 while (skb_queue_len(inputq
)) {
1785 dport
= tipc_skb_peek_port(inputq
, dport
);
1786 tsk
= tipc_sk_lookup(net
, dport
);
1790 if (likely(spin_trylock_bh(&sk
->sk_lock
.slock
))) {
1791 tipc_sk_enqueue(inputq
, sk
, dport
);
1792 spin_unlock_bh(&sk
->sk_lock
.slock
);
1798 /* No destination socket => dequeue skb if still there */
1799 skb
= tipc_skb_dequeue(inputq
, dport
);
1803 /* Try secondary lookup if unresolved named message */
1804 err
= TIPC_ERR_NO_PORT
;
1805 if (tipc_msg_lookup_dest(net
, skb
, &err
))
1808 /* Prepare for message rejection */
1809 if (!tipc_msg_reverse(tipc_own_addr(net
), &skb
, err
))
1812 dnode
= msg_destnode(buf_msg(skb
));
1813 tipc_node_xmit_skb(net
, skb
, dnode
, dport
);
1817 static int tipc_wait_for_connect(struct socket
*sock
, long *timeo_p
)
1819 struct sock
*sk
= sock
->sk
;
1824 int err
= sock_error(sk
);
1829 if (signal_pending(current
))
1830 return sock_intr_errno(*timeo_p
);
1832 prepare_to_wait(sk_sleep(sk
), &wait
, TASK_INTERRUPTIBLE
);
1833 done
= sk_wait_event(sk
, timeo_p
, sock
->state
!= SS_CONNECTING
);
1834 finish_wait(sk_sleep(sk
), &wait
);
1840 * tipc_connect - establish a connection to another TIPC port
1841 * @sock: socket structure
1842 * @dest: socket address for destination port
1843 * @destlen: size of socket address data structure
1844 * @flags: file-related flags associated with socket
1846 * Returns 0 on success, errno otherwise
1848 static int tipc_connect(struct socket
*sock
, struct sockaddr
*dest
,
1849 int destlen
, int flags
)
1851 struct sock
*sk
= sock
->sk
;
1852 struct tipc_sock
*tsk
= tipc_sk(sk
);
1853 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1854 struct msghdr m
= {NULL
,};
1855 long timeout
= (flags
& O_NONBLOCK
) ? 0 : tsk
->conn_timeout
;
1856 socket_state previous
;
1861 /* DGRAM/RDM connect(), just save the destaddr */
1862 if (sock
->state
== SS_READY
) {
1863 if (dst
->family
== AF_UNSPEC
) {
1864 memset(&tsk
->remote
, 0, sizeof(struct sockaddr_tipc
));
1866 } else if (destlen
!= sizeof(struct sockaddr_tipc
)) {
1869 memcpy(&tsk
->remote
, dest
, destlen
);
1876 * Reject connection attempt using multicast address
1878 * Note: send_msg() validates the rest of the address fields,
1879 * so there's no need to do it here
1881 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1886 previous
= sock
->state
;
1887 switch (sock
->state
) {
1888 case SS_UNCONNECTED
:
1889 /* Send a 'SYN-' to destination */
1891 m
.msg_namelen
= destlen
;
1893 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1894 * indicate send_msg() is never blocked.
1897 m
.msg_flags
= MSG_DONTWAIT
;
1899 res
= __tipc_sendmsg(sock
, &m
, 0);
1900 if ((res
< 0) && (res
!= -EWOULDBLOCK
))
1903 /* Just entered SS_CONNECTING state; the only
1904 * difference is that return value in non-blocking
1905 * case is EINPROGRESS, rather than EALREADY.
1909 if (previous
== SS_CONNECTING
)
1913 timeout
= msecs_to_jiffies(timeout
);
1914 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1915 res
= tipc_wait_for_connect(sock
, &timeout
);
1930 * tipc_listen - allow socket to listen for incoming connections
1931 * @sock: socket structure
1934 * Returns 0 on success, errno otherwise
1936 static int tipc_listen(struct socket
*sock
, int len
)
1938 struct sock
*sk
= sock
->sk
;
1943 if (sock
->state
!= SS_UNCONNECTED
)
1946 sock
->state
= SS_LISTENING
;
1954 static int tipc_wait_for_accept(struct socket
*sock
, long timeo
)
1956 struct sock
*sk
= sock
->sk
;
1960 /* True wake-one mechanism for incoming connections: only
1961 * one process gets woken up, not the 'whole herd'.
1962 * Since we do not 'race & poll' for established sockets
1963 * anymore, the common case will execute the loop only once.
1966 prepare_to_wait_exclusive(sk_sleep(sk
), &wait
,
1967 TASK_INTERRUPTIBLE
);
1968 if (timeo
&& skb_queue_empty(&sk
->sk_receive_queue
)) {
1970 timeo
= schedule_timeout(timeo
);
1974 if (!skb_queue_empty(&sk
->sk_receive_queue
))
1977 if (sock
->state
!= SS_LISTENING
)
1982 err
= sock_intr_errno(timeo
);
1983 if (signal_pending(current
))
1986 finish_wait(sk_sleep(sk
), &wait
);
1991 * tipc_accept - wait for connection request
1992 * @sock: listening socket
1993 * @newsock: new socket that is to be connected
1994 * @flags: file-related flags associated with socket
1996 * Returns 0 on success, errno otherwise
1998 static int tipc_accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
2000 struct sock
*new_sk
, *sk
= sock
->sk
;
2001 struct sk_buff
*buf
;
2002 struct tipc_sock
*new_tsock
;
2003 struct tipc_msg
*msg
;
2009 if (sock
->state
!= SS_LISTENING
) {
2013 timeo
= sock_rcvtimeo(sk
, flags
& O_NONBLOCK
);
2014 res
= tipc_wait_for_accept(sock
, timeo
);
2018 buf
= skb_peek(&sk
->sk_receive_queue
);
2020 res
= tipc_sk_create(sock_net(sock
->sk
), new_sock
, 0, 1);
2023 security_sk_clone(sock
->sk
, new_sock
->sk
);
2025 new_sk
= new_sock
->sk
;
2026 new_tsock
= tipc_sk(new_sk
);
2029 /* we lock on new_sk; but lockdep sees the lock on sk */
2030 lock_sock_nested(new_sk
, SINGLE_DEPTH_NESTING
);
2033 * Reject any stray messages received by new socket
2034 * before the socket lock was taken (very, very unlikely)
2036 tsk_rej_rx_queue(new_sk
);
2038 /* Connect new socket to it's peer */
2039 tipc_sk_finish_conn(new_tsock
, msg_origport(msg
), msg_orignode(msg
));
2040 new_sock
->state
= SS_CONNECTED
;
2042 tsk_set_importance(new_tsock
, msg_importance(msg
));
2043 if (msg_named(msg
)) {
2044 new_tsock
->conn_type
= msg_nametype(msg
);
2045 new_tsock
->conn_instance
= msg_nameinst(msg
);
2049 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2050 * Respond to 'SYN+' by queuing it on new socket.
2052 if (!msg_data_sz(msg
)) {
2053 struct msghdr m
= {NULL
,};
2055 tsk_advance_rx_queue(sk
);
2056 __tipc_send_stream(new_sock
, &m
, 0);
2058 __skb_dequeue(&sk
->sk_receive_queue
);
2059 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
2060 skb_set_owner_r(buf
, new_sk
);
2062 release_sock(new_sk
);
2069 * tipc_shutdown - shutdown socket connection
2070 * @sock: socket structure
2071 * @how: direction to close (must be SHUT_RDWR)
2073 * Terminates connection (if necessary), then purges socket's receive queue.
2075 * Returns 0 on success, errno otherwise
2077 static int tipc_shutdown(struct socket
*sock
, int how
)
2079 struct sock
*sk
= sock
->sk
;
2080 struct net
*net
= sock_net(sk
);
2081 struct tipc_sock
*tsk
= tipc_sk(sk
);
2082 struct sk_buff
*skb
;
2083 u32 dnode
= tsk_peer_node(tsk
);
2084 u32 dport
= tsk_peer_port(tsk
);
2085 u32 onode
= tipc_own_addr(net
);
2086 u32 oport
= tsk
->portid
;
2089 if (how
!= SHUT_RDWR
)
2094 switch (sock
->state
) {
2099 dnode
= tsk_peer_node(tsk
);
2101 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2102 skb
= __skb_dequeue(&sk
->sk_receive_queue
);
2104 if (TIPC_SKB_CB(skb
)->handle
!= NULL
) {
2108 tipc_sk_respond(sk
, skb
, TIPC_CONN_SHUTDOWN
);
2110 skb
= tipc_msg_create(TIPC_CRITICAL_IMPORTANCE
,
2111 TIPC_CONN_MSG
, SHORT_H_SIZE
,
2112 0, dnode
, onode
, dport
, oport
,
2113 TIPC_CONN_SHUTDOWN
);
2114 tipc_node_xmit_skb(net
, skb
, dnode
, tsk
->portid
);
2117 sock
->state
= SS_DISCONNECTING
;
2118 tipc_node_remove_conn(net
, dnode
, tsk
->portid
);
2121 case SS_DISCONNECTING
:
2123 /* Discard any unreceived messages */
2124 __skb_queue_purge(&sk
->sk_receive_queue
);
2126 /* Wake up anyone sleeping in poll */
2127 sk
->sk_state_change(sk
);
2139 static void tipc_sk_timeout(unsigned long data
)
2141 struct tipc_sock
*tsk
= (struct tipc_sock
*)data
;
2142 struct sock
*sk
= &tsk
->sk
;
2143 struct sk_buff
*skb
= NULL
;
2144 u32 peer_port
, peer_node
;
2145 u32 own_node
= tsk_own_node(tsk
);
2148 if (!tsk
->connected
) {
2152 peer_port
= tsk_peer_port(tsk
);
2153 peer_node
= tsk_peer_node(tsk
);
2155 if (tsk
->probing_state
== TIPC_CONN_PROBING
) {
2156 if (!sock_owned_by_user(sk
)) {
2157 sk
->sk_socket
->state
= SS_DISCONNECTING
;
2159 tipc_node_remove_conn(sock_net(sk
), tsk_peer_node(tsk
),
2160 tsk_peer_port(tsk
));
2161 sk
->sk_state_change(sk
);
2163 /* Try again later */
2164 sk_reset_timer(sk
, &sk
->sk_timer
, (HZ
/ 20));
2168 skb
= tipc_msg_create(CONN_MANAGER
, CONN_PROBE
,
2169 INT_H_SIZE
, 0, peer_node
, own_node
,
2170 peer_port
, tsk
->portid
, TIPC_OK
);
2171 tsk
->probing_state
= TIPC_CONN_PROBING
;
2172 sk_reset_timer(sk
, &sk
->sk_timer
, jiffies
+ tsk
->probing_intv
);
2176 tipc_node_xmit_skb(sock_net(sk
), skb
, peer_node
, tsk
->portid
);
2181 static int tipc_sk_publish(struct tipc_sock
*tsk
, uint scope
,
2182 struct tipc_name_seq
const *seq
)
2184 struct net
*net
= sock_net(&tsk
->sk
);
2185 struct publication
*publ
;
2190 key
= tsk
->portid
+ tsk
->pub_count
+ 1;
2191 if (key
== tsk
->portid
)
2194 publ
= tipc_nametbl_publish(net
, seq
->type
, seq
->lower
, seq
->upper
,
2195 scope
, tsk
->portid
, key
);
2196 if (unlikely(!publ
))
2199 list_add(&publ
->pport_list
, &tsk
->publications
);
2205 static int tipc_sk_withdraw(struct tipc_sock
*tsk
, uint scope
,
2206 struct tipc_name_seq
const *seq
)
2208 struct net
*net
= sock_net(&tsk
->sk
);
2209 struct publication
*publ
;
2210 struct publication
*safe
;
2213 list_for_each_entry_safe(publ
, safe
, &tsk
->publications
, pport_list
) {
2215 if (publ
->scope
!= scope
)
2217 if (publ
->type
!= seq
->type
)
2219 if (publ
->lower
!= seq
->lower
)
2221 if (publ
->upper
!= seq
->upper
)
2223 tipc_nametbl_withdraw(net
, publ
->type
, publ
->lower
,
2224 publ
->ref
, publ
->key
);
2228 tipc_nametbl_withdraw(net
, publ
->type
, publ
->lower
,
2229 publ
->ref
, publ
->key
);
2232 if (list_empty(&tsk
->publications
))
2237 /* tipc_sk_reinit: set non-zero address in all existing sockets
2238 * when we go from standalone to network mode.
2240 void tipc_sk_reinit(struct net
*net
)
2242 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2243 const struct bucket_table
*tbl
;
2244 struct rhash_head
*pos
;
2245 struct tipc_sock
*tsk
;
2246 struct tipc_msg
*msg
;
2250 tbl
= rht_dereference_rcu((&tn
->sk_rht
)->tbl
, &tn
->sk_rht
);
2251 for (i
= 0; i
< tbl
->size
; i
++) {
2252 rht_for_each_entry_rcu(tsk
, pos
, tbl
, i
, node
) {
2253 spin_lock_bh(&tsk
->sk
.sk_lock
.slock
);
2255 msg_set_prevnode(msg
, tn
->own_addr
);
2256 msg_set_orignode(msg
, tn
->own_addr
);
2257 spin_unlock_bh(&tsk
->sk
.sk_lock
.slock
);
2263 static struct tipc_sock
*tipc_sk_lookup(struct net
*net
, u32 portid
)
2265 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2266 struct tipc_sock
*tsk
;
2269 tsk
= rhashtable_lookup_fast(&tn
->sk_rht
, &portid
, tsk_rht_params
);
2271 sock_hold(&tsk
->sk
);
2277 static int tipc_sk_insert(struct tipc_sock
*tsk
)
2279 struct sock
*sk
= &tsk
->sk
;
2280 struct net
*net
= sock_net(sk
);
2281 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2282 u32 remaining
= (TIPC_MAX_PORT
- TIPC_MIN_PORT
) + 1;
2283 u32 portid
= prandom_u32() % remaining
+ TIPC_MIN_PORT
;
2285 while (remaining
--) {
2287 if ((portid
< TIPC_MIN_PORT
) || (portid
> TIPC_MAX_PORT
))
2288 portid
= TIPC_MIN_PORT
;
2289 tsk
->portid
= portid
;
2290 sock_hold(&tsk
->sk
);
2291 if (!rhashtable_lookup_insert_fast(&tn
->sk_rht
, &tsk
->node
,
2300 static void tipc_sk_remove(struct tipc_sock
*tsk
)
2302 struct sock
*sk
= &tsk
->sk
;
2303 struct tipc_net
*tn
= net_generic(sock_net(sk
), tipc_net_id
);
2305 if (!rhashtable_remove_fast(&tn
->sk_rht
, &tsk
->node
, tsk_rht_params
)) {
2306 WARN_ON(atomic_read(&sk
->sk_refcnt
) == 1);
2311 static const struct rhashtable_params tsk_rht_params
= {
2313 .head_offset
= offsetof(struct tipc_sock
, node
),
2314 .key_offset
= offsetof(struct tipc_sock
, portid
),
2315 .key_len
= sizeof(u32
), /* portid */
2316 .max_size
= 1048576,
2318 .automatic_shrinking
= true,
2321 int tipc_sk_rht_init(struct net
*net
)
2323 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2325 return rhashtable_init(&tn
->sk_rht
, &tsk_rht_params
);
2328 void tipc_sk_rht_destroy(struct net
*net
)
2330 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2332 /* Wait for socket readers to complete */
2335 rhashtable_destroy(&tn
->sk_rht
);
2339 * tipc_setsockopt - set socket option
2340 * @sock: socket structure
2341 * @lvl: option level
2342 * @opt: option identifier
2343 * @ov: pointer to new option value
2344 * @ol: length of option value
2346 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2347 * (to ease compatibility).
2349 * Returns 0 on success, errno otherwise
2351 static int tipc_setsockopt(struct socket
*sock
, int lvl
, int opt
,
2352 char __user
*ov
, unsigned int ol
)
2354 struct sock
*sk
= sock
->sk
;
2355 struct tipc_sock
*tsk
= tipc_sk(sk
);
2359 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
2361 if (lvl
!= SOL_TIPC
)
2362 return -ENOPROTOOPT
;
2363 if (ol
< sizeof(value
))
2365 res
= get_user(value
, (u32 __user
*)ov
);
2372 case TIPC_IMPORTANCE
:
2373 res
= tsk_set_importance(tsk
, value
);
2375 case TIPC_SRC_DROPPABLE
:
2376 if (sock
->type
!= SOCK_STREAM
)
2377 tsk_set_unreliable(tsk
, value
);
2381 case TIPC_DEST_DROPPABLE
:
2382 tsk_set_unreturnable(tsk
, value
);
2384 case TIPC_CONN_TIMEOUT
:
2385 tipc_sk(sk
)->conn_timeout
= value
;
2386 /* no need to set "res", since already 0 at this point */
2398 * tipc_getsockopt - get socket option
2399 * @sock: socket structure
2400 * @lvl: option level
2401 * @opt: option identifier
2402 * @ov: receptacle for option value
2403 * @ol: receptacle for length of option value
2405 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2406 * (to ease compatibility).
2408 * Returns 0 on success, errno otherwise
2410 static int tipc_getsockopt(struct socket
*sock
, int lvl
, int opt
,
2411 char __user
*ov
, int __user
*ol
)
2413 struct sock
*sk
= sock
->sk
;
2414 struct tipc_sock
*tsk
= tipc_sk(sk
);
2419 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
2420 return put_user(0, ol
);
2421 if (lvl
!= SOL_TIPC
)
2422 return -ENOPROTOOPT
;
2423 res
= get_user(len
, ol
);
2430 case TIPC_IMPORTANCE
:
2431 value
= tsk_importance(tsk
);
2433 case TIPC_SRC_DROPPABLE
:
2434 value
= tsk_unreliable(tsk
);
2436 case TIPC_DEST_DROPPABLE
:
2437 value
= tsk_unreturnable(tsk
);
2439 case TIPC_CONN_TIMEOUT
:
2440 value
= tsk
->conn_timeout
;
2441 /* no need to set "res", since already 0 at this point */
2443 case TIPC_NODE_RECVQ_DEPTH
:
2444 value
= 0; /* was tipc_queue_size, now obsolete */
2446 case TIPC_SOCK_RECVQ_DEPTH
:
2447 value
= skb_queue_len(&sk
->sk_receive_queue
);
2456 return res
; /* "get" failed */
2458 if (len
< sizeof(value
))
2461 if (copy_to_user(ov
, &value
, sizeof(value
)))
2464 return put_user(sizeof(value
), ol
);
2467 static int tipc_ioctl(struct socket
*sock
, unsigned int cmd
, unsigned long arg
)
2469 struct sock
*sk
= sock
->sk
;
2470 struct tipc_sioc_ln_req lnr
;
2471 void __user
*argp
= (void __user
*)arg
;
2474 case SIOCGETLINKNAME
:
2475 if (copy_from_user(&lnr
, argp
, sizeof(lnr
)))
2477 if (!tipc_node_get_linkname(sock_net(sk
),
2478 lnr
.bearer_id
& 0xffff, lnr
.peer
,
2479 lnr
.linkname
, TIPC_MAX_LINK_NAME
)) {
2480 if (copy_to_user(argp
, &lnr
, sizeof(lnr
)))
2484 return -EADDRNOTAVAIL
;
2486 return -ENOIOCTLCMD
;
2490 /* Protocol switches for the various types of TIPC sockets */
2492 static const struct proto_ops msg_ops
= {
2493 .owner
= THIS_MODULE
,
2495 .release
= tipc_release
,
2497 .connect
= tipc_connect
,
2498 .socketpair
= sock_no_socketpair
,
2499 .accept
= sock_no_accept
,
2500 .getname
= tipc_getname
,
2502 .ioctl
= tipc_ioctl
,
2503 .listen
= sock_no_listen
,
2504 .shutdown
= tipc_shutdown
,
2505 .setsockopt
= tipc_setsockopt
,
2506 .getsockopt
= tipc_getsockopt
,
2507 .sendmsg
= tipc_sendmsg
,
2508 .recvmsg
= tipc_recvmsg
,
2509 .mmap
= sock_no_mmap
,
2510 .sendpage
= sock_no_sendpage
2513 static const struct proto_ops packet_ops
= {
2514 .owner
= THIS_MODULE
,
2516 .release
= tipc_release
,
2518 .connect
= tipc_connect
,
2519 .socketpair
= sock_no_socketpair
,
2520 .accept
= tipc_accept
,
2521 .getname
= tipc_getname
,
2523 .ioctl
= tipc_ioctl
,
2524 .listen
= tipc_listen
,
2525 .shutdown
= tipc_shutdown
,
2526 .setsockopt
= tipc_setsockopt
,
2527 .getsockopt
= tipc_getsockopt
,
2528 .sendmsg
= tipc_send_packet
,
2529 .recvmsg
= tipc_recvmsg
,
2530 .mmap
= sock_no_mmap
,
2531 .sendpage
= sock_no_sendpage
2534 static const struct proto_ops stream_ops
= {
2535 .owner
= THIS_MODULE
,
2537 .release
= tipc_release
,
2539 .connect
= tipc_connect
,
2540 .socketpair
= sock_no_socketpair
,
2541 .accept
= tipc_accept
,
2542 .getname
= tipc_getname
,
2544 .ioctl
= tipc_ioctl
,
2545 .listen
= tipc_listen
,
2546 .shutdown
= tipc_shutdown
,
2547 .setsockopt
= tipc_setsockopt
,
2548 .getsockopt
= tipc_getsockopt
,
2549 .sendmsg
= tipc_send_stream
,
2550 .recvmsg
= tipc_recv_stream
,
2551 .mmap
= sock_no_mmap
,
2552 .sendpage
= sock_no_sendpage
2555 static const struct net_proto_family tipc_family_ops
= {
2556 .owner
= THIS_MODULE
,
2558 .create
= tipc_sk_create
2561 static struct proto tipc_proto
= {
2563 .owner
= THIS_MODULE
,
2564 .obj_size
= sizeof(struct tipc_sock
),
2565 .sysctl_rmem
= sysctl_tipc_rmem
2569 * tipc_socket_init - initialize TIPC socket interface
2571 * Returns 0 on success, errno otherwise
2573 int tipc_socket_init(void)
2577 res
= proto_register(&tipc_proto
, 1);
2579 pr_err("Failed to register TIPC protocol type\n");
2583 res
= sock_register(&tipc_family_ops
);
2585 pr_err("Failed to register TIPC socket type\n");
2586 proto_unregister(&tipc_proto
);
2594 * tipc_socket_stop - stop TIPC socket interface
2596 void tipc_socket_stop(void)
2598 sock_unregister(tipc_family_ops
.family
);
2599 proto_unregister(&tipc_proto
);
2602 /* Caller should hold socket lock for the passed tipc socket. */
2603 static int __tipc_nl_add_sk_con(struct sk_buff
*skb
, struct tipc_sock
*tsk
)
2607 struct nlattr
*nest
;
2609 peer_node
= tsk_peer_node(tsk
);
2610 peer_port
= tsk_peer_port(tsk
);
2612 nest
= nla_nest_start(skb
, TIPC_NLA_SOCK_CON
);
2614 if (nla_put_u32(skb
, TIPC_NLA_CON_NODE
, peer_node
))
2616 if (nla_put_u32(skb
, TIPC_NLA_CON_SOCK
, peer_port
))
2619 if (tsk
->conn_type
!= 0) {
2620 if (nla_put_flag(skb
, TIPC_NLA_CON_FLAG
))
2622 if (nla_put_u32(skb
, TIPC_NLA_CON_TYPE
, tsk
->conn_type
))
2624 if (nla_put_u32(skb
, TIPC_NLA_CON_INST
, tsk
->conn_instance
))
2627 nla_nest_end(skb
, nest
);
2632 nla_nest_cancel(skb
, nest
);
2637 /* Caller should hold socket lock for the passed tipc socket. */
2638 static int __tipc_nl_add_sk(struct sk_buff
*skb
, struct netlink_callback
*cb
,
2639 struct tipc_sock
*tsk
)
2643 struct nlattr
*attrs
;
2644 struct net
*net
= sock_net(skb
->sk
);
2645 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2647 hdr
= genlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
2648 &tipc_genl_family
, NLM_F_MULTI
, TIPC_NL_SOCK_GET
);
2652 attrs
= nla_nest_start(skb
, TIPC_NLA_SOCK
);
2654 goto genlmsg_cancel
;
2655 if (nla_put_u32(skb
, TIPC_NLA_SOCK_REF
, tsk
->portid
))
2656 goto attr_msg_cancel
;
2657 if (nla_put_u32(skb
, TIPC_NLA_SOCK_ADDR
, tn
->own_addr
))
2658 goto attr_msg_cancel
;
2660 if (tsk
->connected
) {
2661 err
= __tipc_nl_add_sk_con(skb
, tsk
);
2663 goto attr_msg_cancel
;
2664 } else if (!list_empty(&tsk
->publications
)) {
2665 if (nla_put_flag(skb
, TIPC_NLA_SOCK_HAS_PUBL
))
2666 goto attr_msg_cancel
;
2668 nla_nest_end(skb
, attrs
);
2669 genlmsg_end(skb
, hdr
);
2674 nla_nest_cancel(skb
, attrs
);
2676 genlmsg_cancel(skb
, hdr
);
2681 int tipc_nl_sk_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2684 struct tipc_sock
*tsk
;
2685 const struct bucket_table
*tbl
;
2686 struct rhash_head
*pos
;
2687 struct net
*net
= sock_net(skb
->sk
);
2688 struct tipc_net
*tn
= net_generic(net
, tipc_net_id
);
2689 u32 tbl_id
= cb
->args
[0];
2690 u32 prev_portid
= cb
->args
[1];
2693 tbl
= rht_dereference_rcu((&tn
->sk_rht
)->tbl
, &tn
->sk_rht
);
2694 for (; tbl_id
< tbl
->size
; tbl_id
++) {
2695 rht_for_each_entry_rcu(tsk
, pos
, tbl
, tbl_id
, node
) {
2696 spin_lock_bh(&tsk
->sk
.sk_lock
.slock
);
2697 if (prev_portid
&& prev_portid
!= tsk
->portid
) {
2698 spin_unlock_bh(&tsk
->sk
.sk_lock
.slock
);
2702 err
= __tipc_nl_add_sk(skb
, cb
, tsk
);
2704 prev_portid
= tsk
->portid
;
2705 spin_unlock_bh(&tsk
->sk
.sk_lock
.slock
);
2709 spin_unlock_bh(&tsk
->sk
.sk_lock
.slock
);
2714 cb
->args
[0] = tbl_id
;
2715 cb
->args
[1] = prev_portid
;
2720 /* Caller should hold socket lock for the passed tipc socket. */
2721 static int __tipc_nl_add_sk_publ(struct sk_buff
*skb
,
2722 struct netlink_callback
*cb
,
2723 struct publication
*publ
)
2726 struct nlattr
*attrs
;
2728 hdr
= genlmsg_put(skb
, NETLINK_CB(cb
->skb
).portid
, cb
->nlh
->nlmsg_seq
,
2729 &tipc_genl_family
, NLM_F_MULTI
, TIPC_NL_PUBL_GET
);
2733 attrs
= nla_nest_start(skb
, TIPC_NLA_PUBL
);
2735 goto genlmsg_cancel
;
2737 if (nla_put_u32(skb
, TIPC_NLA_PUBL_KEY
, publ
->key
))
2738 goto attr_msg_cancel
;
2739 if (nla_put_u32(skb
, TIPC_NLA_PUBL_TYPE
, publ
->type
))
2740 goto attr_msg_cancel
;
2741 if (nla_put_u32(skb
, TIPC_NLA_PUBL_LOWER
, publ
->lower
))
2742 goto attr_msg_cancel
;
2743 if (nla_put_u32(skb
, TIPC_NLA_PUBL_UPPER
, publ
->upper
))
2744 goto attr_msg_cancel
;
2746 nla_nest_end(skb
, attrs
);
2747 genlmsg_end(skb
, hdr
);
2752 nla_nest_cancel(skb
, attrs
);
2754 genlmsg_cancel(skb
, hdr
);
2759 /* Caller should hold socket lock for the passed tipc socket. */
2760 static int __tipc_nl_list_sk_publ(struct sk_buff
*skb
,
2761 struct netlink_callback
*cb
,
2762 struct tipc_sock
*tsk
, u32
*last_publ
)
2765 struct publication
*p
;
2768 list_for_each_entry(p
, &tsk
->publications
, pport_list
) {
2769 if (p
->key
== *last_publ
)
2772 if (p
->key
!= *last_publ
) {
2773 /* We never set seq or call nl_dump_check_consistent()
2774 * this means that setting prev_seq here will cause the
2775 * consistence check to fail in the netlink callback
2776 * handler. Resulting in the last NLMSG_DONE message
2777 * having the NLM_F_DUMP_INTR flag set.
2784 p
= list_first_entry(&tsk
->publications
, struct publication
,
2788 list_for_each_entry_from(p
, &tsk
->publications
, pport_list
) {
2789 err
= __tipc_nl_add_sk_publ(skb
, cb
, p
);
2791 *last_publ
= p
->key
;
2800 int tipc_nl_publ_dump(struct sk_buff
*skb
, struct netlink_callback
*cb
)
2803 u32 tsk_portid
= cb
->args
[0];
2804 u32 last_publ
= cb
->args
[1];
2805 u32 done
= cb
->args
[2];
2806 struct net
*net
= sock_net(skb
->sk
);
2807 struct tipc_sock
*tsk
;
2810 struct nlattr
**attrs
;
2811 struct nlattr
*sock
[TIPC_NLA_SOCK_MAX
+ 1];
2813 err
= tipc_nlmsg_parse(cb
->nlh
, &attrs
);
2817 err
= nla_parse_nested(sock
, TIPC_NLA_SOCK_MAX
,
2818 attrs
[TIPC_NLA_SOCK
],
2819 tipc_nl_sock_policy
);
2823 if (!sock
[TIPC_NLA_SOCK_REF
])
2826 tsk_portid
= nla_get_u32(sock
[TIPC_NLA_SOCK_REF
]);
2832 tsk
= tipc_sk_lookup(net
, tsk_portid
);
2836 lock_sock(&tsk
->sk
);
2837 err
= __tipc_nl_list_sk_publ(skb
, cb
, tsk
, &last_publ
);
2840 release_sock(&tsk
->sk
);
2843 cb
->args
[0] = tsk_portid
;
2844 cb
->args
[1] = last_publ
;