2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * Copyright (c) 2020-2021, Red Hat Inc
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 #include <linux/rhashtable.h>
39 #include <linux/sched/signal.h>
42 #include "name_table.h"
45 #include "name_distr.h"
52 #define NAGLE_START_INIT 4
53 #define NAGLE_START_MAX 1024
54 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
55 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
56 #define TIPC_MAX_PORT 0xffffffff
57 #define TIPC_MIN_PORT 1
58 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
61 TIPC_LISTEN = TCP_LISTEN,
62 TIPC_ESTABLISHED = TCP_ESTABLISHED,
63 TIPC_OPEN = TCP_CLOSE,
64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
65 TIPC_CONNECTING = TCP_SYN_SENT,
68 struct sockaddr_pair {
69 struct sockaddr_tipc sock;
70 struct sockaddr_tipc member;
74 * struct tipc_sock - TIPC socket structure
75 * @sk: socket - interacts with 'port' and with user via the socket API
76 * @max_pkt: maximum packet size "hint" used when building messages sent by port
77 * @maxnagle: maximum size of msg which can be subject to nagle
78 * @portid: unique port identity in TIPC socket hash table
79 * @phdr: preformatted message header used when sending messages
80 * @cong_links: list of congested links
81 * @publications: list of publications for port
82 * @blocking_link: address of the congested link we are currently sleeping on
83 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @probe_unacked: probe has not received ack yet
86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
87 * @cong_link_cnt: number of congested links
88 * @snt_unacked: # messages sent by socket, and not yet acked by peer
89 * @snd_win: send window size
90 * @peer_caps: peer capabilities mask
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @rcv_win: receive window size
93 * @peer: 'connected' peer for dgram/rdm
94 * @node: hash table node
95 * @mc_method: cookie for use between socket and broadcast layer
96 * @rcu: rcu struct for tipc_sock
97 * @group: TIPC communications group
98 * @oneway: message count in one direction (FIXME)
99 * @nagle_start: current nagle value
100 * @snd_backlog: send backlog count
101 * @msg_acc: messages accepted; used in managing backlog and nagle
102 * @pkt_cnt: TIPC socket packet count
103 * @expect_ack: whether this TIPC socket is expecting an ack
104 * @nodelay: setsockopt() TIPC_NODELAY setting
105 * @group_is_open: TIPC socket group is fully open (FIXME)
106 * @published: true if port has one or more associated names
107 * @conn_addrtype: address type used when establishing connection
114 struct tipc_msg phdr;
115 struct list_head cong_links;
116 struct list_head publications;
118 atomic_t dupl_rcvcnt;
127 struct sockaddr_tipc peer;
128 struct rhash_head node;
129 struct tipc_mc_method mc_method;
131 struct tipc_group *group;
144 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
145 static void tipc_data_ready(struct sock *sk);
146 static void tipc_write_space(struct sock *sk);
147 static void tipc_sock_destruct(struct sock *sk);
148 static int tipc_release(struct socket *sock);
149 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
151 static void tipc_sk_timeout(struct timer_list *t);
152 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
153 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154 static int tipc_sk_leave(struct tipc_sock *tsk);
155 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
156 static int tipc_sk_insert(struct tipc_sock *tsk);
157 static void tipc_sk_remove(struct tipc_sock *tsk);
158 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
159 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
160 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
162 static const struct proto_ops packet_ops;
163 static const struct proto_ops stream_ops;
164 static const struct proto_ops msg_ops;
165 static struct proto tipc_proto;
166 static const struct rhashtable_params tsk_rht_params;
168 static u32 tsk_own_node(struct tipc_sock *tsk)
170 return msg_prevnode(&tsk->phdr);
173 static u32 tsk_peer_node(struct tipc_sock *tsk)
175 return msg_destnode(&tsk->phdr);
178 static u32 tsk_peer_port(struct tipc_sock *tsk)
180 return msg_destport(&tsk->phdr);
183 static bool tsk_unreliable(struct tipc_sock *tsk)
185 return msg_src_droppable(&tsk->phdr) != 0;
188 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
190 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
193 static bool tsk_unreturnable(struct tipc_sock *tsk)
195 return msg_dest_droppable(&tsk->phdr) != 0;
198 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
200 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
203 static int tsk_importance(struct tipc_sock *tsk)
205 return msg_importance(&tsk->phdr);
208 static struct tipc_sock *tipc_sk(const struct sock *sk)
210 return container_of(sk, struct tipc_sock, sk);
213 int tsk_set_importance(struct sock *sk, int imp)
215 if (imp > TIPC_CRITICAL_IMPORTANCE)
217 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
221 static bool tsk_conn_cong(struct tipc_sock *tsk)
223 return tsk->snt_unacked > tsk->snd_win;
226 static u16 tsk_blocks(int len)
228 return ((len / FLOWCTL_BLK_SZ) + 1);
231 /* tsk_blocks(): translate a buffer size in bytes to number of
232 * advertisable blocks, taking into account the ratio truesize(len)/len
233 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
235 static u16 tsk_adv_blocks(int len)
237 return len / FLOWCTL_BLK_SZ / 4;
240 /* tsk_inc(): increment counter for sent or received data
241 * - If block based flow control is not supported by peer we
242 * fall back to message based ditto, incrementing the counter
244 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
246 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
247 return ((msglen / FLOWCTL_BLK_SZ) + 1);
251 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
253 static void tsk_set_nagle(struct tipc_sock *tsk)
255 struct sock *sk = &tsk->sk;
258 if (sk->sk_type != SOCK_STREAM)
262 if (!(tsk->peer_caps & TIPC_NAGLE))
264 /* Limit node local buffer size to avoid receive queue overflow */
265 if (tsk->max_pkt == MAX_MSG_SIZE)
266 tsk->maxnagle = 1500;
268 tsk->maxnagle = tsk->max_pkt;
272 * tsk_advance_rx_queue - discard first buffer in socket receive queue
273 * @sk: network socket
275 * Caller must hold socket lock
277 static void tsk_advance_rx_queue(struct sock *sk)
279 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
280 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
283 /* tipc_sk_respond() : send response message back to sender
285 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
289 u32 onode = tipc_own_addr(sock_net(sk));
291 if (!tipc_msg_reverse(onode, &skb, err))
294 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
295 dnode = msg_destnode(buf_msg(skb));
296 selector = msg_origport(buf_msg(skb));
297 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
301 * tsk_rej_rx_queue - reject all buffers in socket receive queue
302 * @sk: network socket
303 * @error: response error code
305 * Caller must hold socket lock
307 static void tsk_rej_rx_queue(struct sock *sk, int error)
311 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
312 tipc_sk_respond(sk, skb, error);
315 static bool tipc_sk_connected(struct sock *sk)
317 return sk->sk_state == TIPC_ESTABLISHED;
320 /* tipc_sk_type_connectionless - check if the socket is datagram socket
323 * Returns true if connection less, false otherwise
325 static bool tipc_sk_type_connectionless(struct sock *sk)
327 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
330 /* tsk_peer_msg - verify if message was sent by connected port's peer
332 * Handles cases where the node's network address has changed from
333 * the default of <0.0.0> to its configured setting.
335 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
337 struct sock *sk = &tsk->sk;
338 u32 self = tipc_own_addr(sock_net(sk));
339 u32 peer_port = tsk_peer_port(tsk);
340 u32 orig_node, peer_node;
342 if (unlikely(!tipc_sk_connected(sk)))
345 if (unlikely(msg_origport(msg) != peer_port))
348 orig_node = msg_orignode(msg);
349 peer_node = tsk_peer_node(tsk);
351 if (likely(orig_node == peer_node))
354 if (!orig_node && peer_node == self)
357 if (!peer_node && orig_node == self)
363 /* tipc_set_sk_state - set the sk_state of the socket
366 * Caller must hold socket lock
368 * Returns 0 on success, errno otherwise
370 static int tipc_set_sk_state(struct sock *sk, int state)
372 int oldsk_state = sk->sk_state;
380 case TIPC_CONNECTING:
381 if (oldsk_state == TIPC_OPEN)
384 case TIPC_ESTABLISHED:
385 if (oldsk_state == TIPC_CONNECTING ||
386 oldsk_state == TIPC_OPEN)
389 case TIPC_DISCONNECTING:
390 if (oldsk_state == TIPC_CONNECTING ||
391 oldsk_state == TIPC_ESTABLISHED)
397 sk->sk_state = state;
402 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
404 struct sock *sk = sock->sk;
405 int err = sock_error(sk);
406 int typ = sock->type;
410 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
411 if (sk->sk_state == TIPC_DISCONNECTING)
413 else if (!tipc_sk_connected(sk))
418 if (signal_pending(current))
419 return sock_intr_errno(*timeout);
424 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
426 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
430 while ((rc_ = !(condition_))) { \
431 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
434 rc_ = tipc_sk_sock_err((sock_), timeo_); \
437 add_wait_queue(sk_sleep(sk_), &wait_); \
439 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
440 sched_annotate_sleep(); \
442 remove_wait_queue(sk_sleep(sk_), &wait_); \
448 * tipc_sk_create - create a TIPC socket
449 * @net: network namespace (must be default network)
450 * @sock: pre-allocated socket structure
451 * @protocol: protocol indicator (must be 0)
452 * @kern: caused by kernel or by userspace?
454 * This routine creates additional data structures used by the TIPC socket,
455 * initializes them, and links them together.
457 * Return: 0 on success, errno otherwise
459 static int tipc_sk_create(struct net *net, struct socket *sock,
460 int protocol, int kern)
462 const struct proto_ops *ops;
464 struct tipc_sock *tsk;
465 struct tipc_msg *msg;
467 /* Validate arguments */
468 if (unlikely(protocol != 0))
469 return -EPROTONOSUPPORT;
471 switch (sock->type) {
486 /* Allocate socket's protocol area */
487 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
492 tsk->max_pkt = MAX_PKT_DEFAULT;
494 tsk->nagle_start = NAGLE_START_INIT;
495 INIT_LIST_HEAD(&tsk->publications);
496 INIT_LIST_HEAD(&tsk->cong_links);
499 /* Finish initializing socket data structures */
501 sock_init_data(sock, sk);
502 tipc_set_sk_state(sk, TIPC_OPEN);
503 if (tipc_sk_insert(tsk)) {
504 pr_warn("Socket create failed; port number exhausted\n");
508 /* Ensure tsk is visible before we read own_addr. */
511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
514 msg_set_origport(msg, tsk->portid);
515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
518 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
519 sk->sk_data_ready = tipc_data_ready;
520 sk->sk_write_space = tipc_write_space;
521 sk->sk_destruct = tipc_sock_destruct;
522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
523 tsk->group_is_open = true;
524 atomic_set(&tsk->dupl_rcvcnt, 0);
526 /* Start out with safe limits until we receive an advertised window */
527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
528 tsk->rcv_win = tsk->snd_win;
530 if (tipc_sk_type_connectionless(sk)) {
531 tsk_set_unreturnable(tsk, true);
532 if (sock->type == SOCK_DGRAM)
533 tsk_set_unreliable(tsk, true);
535 __skb_queue_head_init(&tsk->mc_method.deferredq);
536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
540 static void tipc_sk_callback(struct rcu_head *head)
542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
547 /* Caller should hold socket lock for the socket. */
548 static void __tipc_shutdown(struct socket *sock, int error)
550 struct sock *sk = sock->sk;
551 struct tipc_sock *tsk = tipc_sk(sk);
552 struct net *net = sock_net(sk);
553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
554 u32 dnode = tsk_peer_node(tsk);
557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
559 !tsk_conn_cong(tsk)));
561 /* Push out delayed messages if in Nagle mode */
562 tipc_sk_push_backlog(tsk, false);
563 /* Remove pending SYN */
564 __skb_queue_purge(&sk->sk_write_queue);
566 /* Remove partially received buffer if any */
567 skb = skb_peek(&sk->sk_receive_queue);
568 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
569 __skb_unlink(skb, &sk->sk_receive_queue);
573 /* Reject all unreceived messages if connectionless */
574 if (tipc_sk_type_connectionless(sk)) {
575 tsk_rej_rx_queue(sk, error);
579 switch (sk->sk_state) {
580 case TIPC_CONNECTING:
581 case TIPC_ESTABLISHED:
582 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
583 tipc_node_remove_conn(net, dnode, tsk->portid);
584 /* Send a FIN+/- to its peer */
585 skb = __skb_dequeue(&sk->sk_receive_queue);
587 __skb_queue_purge(&sk->sk_receive_queue);
588 tipc_sk_respond(sk, skb, error);
591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
593 tsk_own_node(tsk), tsk_peer_port(tsk),
596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
599 /* Reject all SYN messages */
600 tsk_rej_rx_queue(sk, error);
603 __skb_queue_purge(&sk->sk_receive_queue);
609 * tipc_release - destroy a TIPC socket
610 * @sock: socket to destroy
612 * This routine cleans up any messages that are still queued on the socket.
613 * For DGRAM and RDM socket types, all queued messages are rejected.
614 * For SEQPACKET and STREAM socket types, the first message is rejected
615 * and any others are discarded. (If the first message on a STREAM socket
616 * is partially-read, it is discarded and the next one is rejected instead.)
618 * NOTE: Rejected messages are not necessarily returned to the sender! They
619 * are returned or discarded according to the "destination droppable" setting
620 * specified for the message by the sender.
622 * Return: 0 on success, errno otherwise
624 static int tipc_release(struct socket *sock)
626 struct sock *sk = sock->sk;
627 struct tipc_sock *tsk;
630 * Exit if socket isn't fully initialized (occurs when a failed accept()
631 * releases a pre-allocated child socket that was never used)
639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
641 sk->sk_shutdown = SHUTDOWN_MASK;
643 tipc_sk_withdraw(tsk, NULL);
644 __skb_queue_purge(&tsk->mc_method.deferredq);
645 sk_stop_timer(sk, &sk->sk_timer);
649 /* Reject any messages that accumulated in backlog queue */
651 tipc_dest_list_purge(&tsk->cong_links);
652 tsk->cong_link_cnt = 0;
653 call_rcu(&tsk->rcu, tipc_sk_callback);
660 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
661 * @sock: socket structure
662 * @skaddr: socket address describing name(s) and desired operation
663 * @alen: size of socket address data structure
665 * Name and name sequence binding are indicated using a positive scope value;
666 * a negative scope value unbinds the specified name. Specifying no name
667 * (i.e. a socket address length of 0) unbinds all names from the socket.
669 * Return: 0 on success, errno otherwise
671 * NOTE: This routine doesn't need to take the socket lock since it doesn't
672 * access any non-constant socket information.
674 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
677 struct tipc_sock *tsk = tipc_sk(sock->sk);
681 return tipc_sk_withdraw(tsk, NULL);
683 if (ua->addrtype == TIPC_SERVICE_ADDR) {
684 ua->addrtype = TIPC_SERVICE_RANGE;
685 ua->sr.upper = ua->sr.lower;
689 ua->scope = -ua->scope;
691 /* Users may still use deprecated TIPC_ZONE_SCOPE */
692 if (ua->scope != TIPC_NODE_SCOPE)
693 ua->scope = TIPC_CLUSTER_SCOPE;
699 return tipc_sk_withdraw(tsk, ua);
700 return tipc_sk_publish(tsk, ua);
703 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
708 res = __tipc_bind(sock, skaddr, alen);
709 release_sock(sock->sk);
713 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
716 u32 atype = ua->addrtype;
719 if (!tipc_uaddr_valid(ua, alen))
721 if (atype == TIPC_SOCKET_ADDR)
722 return -EAFNOSUPPORT;
723 if (ua->sr.type < TIPC_RESERVED_TYPES) {
724 pr_warn_once("Can't bind to reserved service type %u\n",
729 return tipc_sk_bind(sock, skaddr, alen);
733 * tipc_getname - get port ID of socket or peer socket
734 * @sock: socket structure
735 * @uaddr: area for returned socket address
736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
738 * Return: 0 on success, errno otherwise
740 * NOTE: This routine doesn't need to take the socket lock since it only
741 * accesses socket information that is unchanging (or which changes in
742 * a completely predictable manner).
744 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
748 struct sock *sk = sock->sk;
749 struct tipc_sock *tsk = tipc_sk(sk);
751 memset(addr, 0, sizeof(*addr));
753 if ((!tipc_sk_connected(sk)) &&
754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
756 addr->addr.id.ref = tsk_peer_port(tsk);
757 addr->addr.id.node = tsk_peer_node(tsk);
759 addr->addr.id.ref = tsk->portid;
760 addr->addr.id.node = tipc_own_addr(sock_net(sk));
763 addr->addrtype = TIPC_SOCKET_ADDR;
764 addr->family = AF_TIPC;
766 addr->addr.name.domain = 0;
768 return sizeof(*addr);
772 * tipc_poll - read and possibly block on pollmask
773 * @file: file structure associated with the socket
774 * @sock: socket for which to calculate the poll bits
777 * Return: pollmask value
780 * It appears that the usual socket locking mechanisms are not useful here
781 * since the pollmask info is potentially out-of-date the moment this routine
782 * exits. TCP and other protocols seem to rely on higher level poll routines
783 * to handle any preventable race conditions, so TIPC will do the same ...
785 * IMPORTANT: The fact that a read or write operation is indicated does NOT
786 * imply that the operation will succeed, merely that it should be performed
787 * and will not block.
789 static __poll_t tipc_poll(struct file *file, struct socket *sock,
792 struct sock *sk = sock->sk;
793 struct tipc_sock *tsk = tipc_sk(sk);
794 __poll_t revents = 0;
796 sock_poll_wait(file, sock, wait);
797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
799 if (sk->sk_shutdown & RCV_SHUTDOWN)
800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
801 if (sk->sk_shutdown == SHUTDOWN_MASK)
804 switch (sk->sk_state) {
805 case TIPC_ESTABLISHED:
806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
810 case TIPC_CONNECTING:
811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
812 revents |= EPOLLIN | EPOLLRDNORM;
815 if (tsk->group_is_open && !tsk->cong_link_cnt)
817 if (!tipc_sk_type_connectionless(sk))
819 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
821 revents |= EPOLLIN | EPOLLRDNORM;
823 case TIPC_DISCONNECTING:
824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
831 * tipc_sendmcast - send multicast message
832 * @sock: socket structure
833 * @ua: destination address struct
834 * @msg: message to send
835 * @dlen: length of data to send
836 * @timeout: timeout to wait for wakeup
838 * Called from function tipc_sendmsg(), which has done all sanity checks
839 * Return: the number of bytes sent on success, or errno
841 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
842 struct msghdr *msg, size_t dlen, long timeout)
844 struct sock *sk = sock->sk;
845 struct tipc_sock *tsk = tipc_sk(sk);
846 struct tipc_msg *hdr = &tsk->phdr;
847 struct net *net = sock_net(sk);
848 int mtu = tipc_bcast_get_mtu(net);
849 struct sk_buff_head pkts;
850 struct tipc_nlist dsts;
856 /* Block or return if any destination link is congested */
857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
861 /* Lookup destination nodes */
862 tipc_nlist_init(&dsts, tipc_own_addr(net));
863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
864 if (!dsts.local && !dsts.remote)
865 return -EHOSTUNREACH;
867 /* Build message header */
868 msg_set_type(hdr, TIPC_MCAST_MSG);
869 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
871 msg_set_destport(hdr, 0);
872 msg_set_destnode(hdr, 0);
873 msg_set_nametype(hdr, ua->sr.type);
874 msg_set_namelower(hdr, ua->sr.lower);
875 msg_set_nameupper(hdr, ua->sr.upper);
877 /* Build message as chain of buffers */
878 __skb_queue_head_init(&pkts);
879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
881 /* Send message if build was successful */
882 if (unlikely(rc == dlen)) {
883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
884 TIPC_DUMP_SK_SNDQ, " ");
885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
886 &tsk->cong_link_cnt);
889 tipc_nlist_purge(&dsts);
891 return rc ? rc : dlen;
895 * tipc_send_group_msg - send a message to a member in the group
896 * @net: network namespace
898 * @m: message to send
900 * @dnode: destination node
901 * @dport: destination port
902 * @dlen: total length of message data
904 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
905 struct msghdr *m, struct tipc_member *mb,
906 u32 dnode, u32 dport, int dlen)
908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
909 struct tipc_mc_method *method = &tsk->mc_method;
910 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
911 struct tipc_msg *hdr = &tsk->phdr;
912 struct sk_buff_head pkts;
915 /* Complete message header */
916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
917 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
918 msg_set_destport(hdr, dport);
919 msg_set_destnode(hdr, dnode);
920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
922 /* Build message as chain of buffers */
923 __skb_queue_head_init(&pkts);
924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
926 if (unlikely(rc != dlen))
930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
931 if (unlikely(rc == -ELINKCONG)) {
932 tipc_dest_push(&tsk->cong_links, dnode, 0);
933 tsk->cong_link_cnt++;
936 /* Update send window */
937 tipc_group_update_member(mb, blks);
939 /* A broadcast sent within next EXPIRE period must follow same path */
940 method->rcast = true;
941 method->mandatory = true;
946 * tipc_send_group_unicast - send message to a member in the group
947 * @sock: socket structure
948 * @m: message to send
949 * @dlen: total length of message data
950 * @timeout: timeout to wait for wakeup
952 * Called from function tipc_sendmsg(), which has done all sanity checks
953 * Return: the number of bytes sent on success, or errno
955 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
956 int dlen, long timeout)
958 struct sock *sk = sock->sk;
959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
960 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
961 struct tipc_sock *tsk = tipc_sk(sk);
962 struct net *net = sock_net(sk);
963 struct tipc_member *mb = NULL;
970 return -EHOSTUNREACH;
972 /* Block or return if destination link or member is congested */
973 rc = tipc_wait_for_cond(sock, &timeout,
974 !tipc_dest_find(&tsk->cong_links, node, 0) &&
976 !tipc_group_cong(tsk->group, node, port, blks,
982 return -EHOSTUNREACH;
984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
986 return rc ? rc : dlen;
990 * tipc_send_group_anycast - send message to any member with given identity
991 * @sock: socket structure
992 * @m: message to send
993 * @dlen: total length of message data
994 * @timeout: timeout to wait for wakeup
996 * Called from function tipc_sendmsg(), which has done all sanity checks
997 * Return: the number of bytes sent on success, or errno
999 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1000 int dlen, long timeout)
1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1003 struct sock *sk = sock->sk;
1004 struct tipc_sock *tsk = tipc_sk(sk);
1005 struct list_head *cong_links = &tsk->cong_links;
1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1007 struct tipc_msg *hdr = &tsk->phdr;
1008 struct tipc_member *first = NULL;
1009 struct tipc_member *mbr = NULL;
1010 struct net *net = sock_net(sk);
1011 u32 node, port, exclude;
1012 struct list_head dsts;
1017 INIT_LIST_HEAD(&dsts);
1018 ua->sa.type = msg_nametype(hdr);
1019 ua->scope = msg_lookup_scope(hdr);
1021 while (++lookups < 4) {
1022 exclude = tipc_group_exclude(tsk->group);
1026 /* Look for a non-congested destination member, if any */
1028 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1030 return -EHOSTUNREACH;
1031 tipc_dest_pop(&dsts, &node, &port);
1032 cong = tipc_group_cong(tsk->group, node, port, blks,
1042 /* Start over if destination was not in member list */
1046 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1049 /* Block or return if destination link or member is congested */
1050 rc = tipc_wait_for_cond(sock, &timeout,
1051 !tipc_dest_find(cong_links, node, 0) &&
1053 !tipc_group_cong(tsk->group, node, port,
1058 /* Send, unless destination disappeared while waiting */
1063 if (unlikely(lookups >= 4))
1064 return -EHOSTUNREACH;
1066 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1068 return rc ? rc : dlen;
1072 * tipc_send_group_bcast - send message to all members in communication group
1073 * @sock: socket structure
1074 * @m: message to send
1075 * @dlen: total length of message data
1076 * @timeout: timeout to wait for wakeup
1078 * Called from function tipc_sendmsg(), which has done all sanity checks
1079 * Return: the number of bytes sent on success, or errno
1081 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1082 int dlen, long timeout)
1084 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1085 struct sock *sk = sock->sk;
1086 struct net *net = sock_net(sk);
1087 struct tipc_sock *tsk = tipc_sk(sk);
1088 struct tipc_nlist *dsts;
1089 struct tipc_mc_method *method = &tsk->mc_method;
1090 bool ack = method->mandatory && method->rcast;
1091 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1092 struct tipc_msg *hdr = &tsk->phdr;
1093 int mtu = tipc_bcast_get_mtu(net);
1094 struct sk_buff_head pkts;
1095 int rc = -EHOSTUNREACH;
1097 /* Block or return if any destination link or member is congested */
1098 rc = tipc_wait_for_cond(sock, &timeout,
1099 !tsk->cong_link_cnt && tsk->group &&
1100 !tipc_group_bc_cong(tsk->group, blks));
1104 dsts = tipc_group_dests(tsk->group);
1105 if (!dsts->local && !dsts->remote)
1106 return -EHOSTUNREACH;
1108 /* Complete message header */
1110 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1111 msg_set_nameinst(hdr, ua->sa.instance);
1113 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1114 msg_set_nameinst(hdr, 0);
1116 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1117 msg_set_destport(hdr, 0);
1118 msg_set_destnode(hdr, 0);
1119 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1121 /* Avoid getting stuck with repeated forced replicasts */
1122 msg_set_grp_bc_ack_req(hdr, ack);
1124 /* Build message as chain of buffers */
1125 __skb_queue_head_init(&pkts);
1126 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1127 if (unlikely(rc != dlen))
1131 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1135 /* Update broadcast sequence number and send windows */
1136 tipc_group_update_bc_members(tsk->group, blks, ack);
1138 /* Broadcast link is now free to choose method for next broadcast */
1139 method->mandatory = false;
1140 method->expires = jiffies;
1146 * tipc_send_group_mcast - send message to all members with given identity
1147 * @sock: socket structure
1148 * @m: message to send
1149 * @dlen: total length of message data
1150 * @timeout: timeout to wait for wakeup
1152 * Called from function tipc_sendmsg(), which has done all sanity checks
1153 * Return: the number of bytes sent on success, or errno
1155 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1156 int dlen, long timeout)
1158 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1159 struct sock *sk = sock->sk;
1160 struct tipc_sock *tsk = tipc_sk(sk);
1161 struct tipc_group *grp = tsk->group;
1162 struct tipc_msg *hdr = &tsk->phdr;
1163 struct net *net = sock_net(sk);
1164 struct list_head dsts;
1165 u32 dstcnt, exclude;
1167 INIT_LIST_HEAD(&dsts);
1168 ua->sa.type = msg_nametype(hdr);
1169 ua->scope = msg_lookup_scope(hdr);
1170 exclude = tipc_group_exclude(grp);
1172 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1173 return -EHOSTUNREACH;
1176 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1177 return tipc_send_group_unicast(sock, m, dlen, timeout);
1180 tipc_dest_list_purge(&dsts);
1181 return tipc_send_group_bcast(sock, m, dlen, timeout);
1185 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1186 * @net: the associated network namespace
1187 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1188 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1190 * Multi-threaded: parallel calls with reference to same queues may occur
1192 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1193 struct sk_buff_head *inputq)
1195 u32 self = tipc_own_addr(net);
1196 struct sk_buff *skb, *_skb;
1198 struct sk_buff_head tmpq;
1199 struct list_head dports;
1200 struct tipc_msg *hdr;
1201 struct tipc_uaddr ua;
1202 int user, mtyp, hlen;
1204 __skb_queue_head_init(&tmpq);
1205 INIT_LIST_HEAD(&dports);
1206 ua.addrtype = TIPC_SERVICE_RANGE;
1208 /* tipc_skb_peek() increments the head skb's reference counter */
1209 skb = tipc_skb_peek(arrvq, &inputq->lock);
1210 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1212 user = msg_user(hdr);
1213 mtyp = msg_type(hdr);
1214 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1215 onode = msg_orignode(hdr);
1216 ua.sr.type = msg_nametype(hdr);
1217 ua.sr.lower = msg_namelower(hdr);
1218 ua.sr.upper = msg_nameupper(hdr);
1220 ua.scope = TIPC_ANY_SCOPE;
1222 ua.scope = TIPC_CLUSTER_SCOPE;
1224 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1225 spin_lock_bh(&inputq->lock);
1226 if (skb_peek(arrvq) == skb) {
1227 __skb_dequeue(arrvq);
1228 __skb_queue_tail(inputq, skb);
1231 spin_unlock_bh(&inputq->lock);
1235 /* Group messages require exact scope match */
1236 if (msg_in_group(hdr)) {
1239 ua.scope = msg_lookup_scope(hdr);
1242 /* Create destination port list: */
1243 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1245 /* Clone message per destination */
1246 while (tipc_dest_pop(&dports, NULL, &portid)) {
1247 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1249 msg_set_destport(buf_msg(_skb), portid);
1250 __skb_queue_tail(&tmpq, _skb);
1253 pr_warn("Failed to clone mcast rcv buffer\n");
1255 /* Append clones to inputq only if skb is still head of arrvq */
1256 spin_lock_bh(&inputq->lock);
1257 if (skb_peek(arrvq) == skb) {
1258 skb_queue_splice_tail_init(&tmpq, inputq);
1259 /* Decrement the skb's refcnt */
1260 kfree_skb(__skb_dequeue(arrvq));
1262 spin_unlock_bh(&inputq->lock);
1263 __skb_queue_purge(&tmpq);
1266 tipc_sk_rcv(net, inputq);
1269 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1270 * when socket is in Nagle mode
1272 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1274 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1275 struct sk_buff *skb = skb_peek_tail(txq);
1276 struct net *net = sock_net(&tsk->sk);
1277 u32 dnode = tsk_peer_node(tsk);
1281 tsk->pkt_cnt += skb_queue_len(txq);
1282 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1284 if (tsk->nagle_start < NAGLE_START_MAX)
1285 tsk->nagle_start *= 2;
1286 tsk->expect_ack = false;
1287 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1288 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1291 tsk->nagle_start = NAGLE_START_INIT;
1293 msg_set_ack_required(buf_msg(skb));
1294 tsk->expect_ack = true;
1296 tsk->expect_ack = false;
1303 if (!skb || tsk->cong_link_cnt)
1306 /* Do not send SYN again after congestion */
1307 if (msg_is_syn(buf_msg(skb)))
1311 tsk->pkt_cnt += skb_queue_len(txq);
1312 tsk->snt_unacked += tsk->snd_backlog;
1313 tsk->snd_backlog = 0;
1314 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1315 if (rc == -ELINKCONG)
1316 tsk->cong_link_cnt = 1;
1320 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1321 * @tsk: receiving socket
1322 * @skb: pointer to message buffer.
1323 * @inputq: buffer list containing the buffers
1324 * @xmitq: output message area
1326 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1327 struct sk_buff_head *inputq,
1328 struct sk_buff_head *xmitq)
1330 struct tipc_msg *hdr = buf_msg(skb);
1331 u32 onode = tsk_own_node(tsk);
1332 struct sock *sk = &tsk->sk;
1333 int mtyp = msg_type(hdr);
1336 /* Ignore if connection cannot be validated: */
1337 if (!tsk_peer_msg(tsk, hdr)) {
1338 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1342 if (unlikely(msg_errcode(hdr))) {
1343 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1344 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1345 tsk_peer_port(tsk));
1346 sk->sk_state_change(sk);
1348 /* State change is ignored if socket already awake,
1349 * - convert msg to abort msg and add to inqueue
1351 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1352 msg_set_type(hdr, TIPC_CONN_MSG);
1353 msg_set_size(hdr, BASIC_H_SIZE);
1354 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1355 __skb_queue_tail(inputq, skb);
1359 tsk->probe_unacked = false;
1361 if (mtyp == CONN_PROBE) {
1362 msg_set_type(hdr, CONN_PROBE_REPLY);
1363 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1364 __skb_queue_tail(xmitq, skb);
1366 } else if (mtyp == CONN_ACK) {
1367 was_cong = tsk_conn_cong(tsk);
1368 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1369 tsk->snt_unacked -= msg_conn_ack(hdr);
1370 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1371 tsk->snd_win = msg_adv_win(hdr);
1372 if (was_cong && !tsk_conn_cong(tsk))
1373 sk->sk_write_space(sk);
1374 } else if (mtyp != CONN_PROBE_REPLY) {
1375 pr_warn("Received unknown CONN_PROTO msg\n");
1382 * tipc_sendmsg - send message in connectionless manner
1383 * @sock: socket structure
1384 * @m: message to send
1385 * @dsz: amount of user data to be sent
1387 * Message must have an destination specified explicitly.
1388 * Used for SOCK_RDM and SOCK_DGRAM messages,
1389 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1390 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1392 * Return: the number of bytes sent on success, or errno otherwise
1394 static int tipc_sendmsg(struct socket *sock,
1395 struct msghdr *m, size_t dsz)
1397 struct sock *sk = sock->sk;
1401 ret = __tipc_sendmsg(sock, m, dsz);
1407 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1409 struct sock *sk = sock->sk;
1410 struct net *net = sock_net(sk);
1411 struct tipc_sock *tsk = tipc_sk(sk);
1412 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1413 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1414 struct list_head *clinks = &tsk->cong_links;
1415 bool syn = !tipc_sk_type_connectionless(sk);
1416 struct tipc_group *grp = tsk->group;
1417 struct tipc_msg *hdr = &tsk->phdr;
1418 struct tipc_socket_addr skaddr;
1419 struct sk_buff_head pkts;
1422 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1426 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1428 atype = ua->addrtype;
1431 /* If socket belongs to a communication group follow other paths */
1434 return tipc_send_group_bcast(sock, m, dlen, timeout);
1435 if (atype == TIPC_SERVICE_ADDR)
1436 return tipc_send_group_anycast(sock, m, dlen, timeout);
1437 if (atype == TIPC_SOCKET_ADDR)
1438 return tipc_send_group_unicast(sock, m, dlen, timeout);
1439 if (atype == TIPC_SERVICE_RANGE)
1440 return tipc_send_group_mcast(sock, m, dlen, timeout);
1445 ua = (struct tipc_uaddr *)&tsk->peer;
1446 if (!syn && ua->family != AF_TIPC)
1447 return -EDESTADDRREQ;
1448 atype = ua->addrtype;
1451 if (unlikely(syn)) {
1452 if (sk->sk_state == TIPC_LISTEN)
1454 if (sk->sk_state != TIPC_OPEN)
1458 if (atype == TIPC_SERVICE_ADDR)
1459 tsk->conn_addrtype = atype;
1460 msg_set_syn(hdr, 1);
1463 /* Determine destination */
1464 if (atype == TIPC_SERVICE_RANGE) {
1465 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1466 } else if (atype == TIPC_SERVICE_ADDR) {
1467 skaddr.node = ua->lookup_node;
1468 ua->scope = tipc_node2scope(skaddr.node);
1469 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1470 return -EHOSTUNREACH;
1471 } else if (atype == TIPC_SOCKET_ADDR) {
1477 /* Block or return if destination link is congested */
1478 rc = tipc_wait_for_cond(sock, &timeout,
1479 !tipc_dest_find(clinks, skaddr.node, 0));
1483 /* Finally build message header */
1484 msg_set_destnode(hdr, skaddr.node);
1485 msg_set_destport(hdr, skaddr.ref);
1486 if (atype == TIPC_SERVICE_ADDR) {
1487 msg_set_type(hdr, TIPC_NAMED_MSG);
1488 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1489 msg_set_nametype(hdr, ua->sa.type);
1490 msg_set_nameinst(hdr, ua->sa.instance);
1491 msg_set_lookup_scope(hdr, ua->scope);
1492 } else { /* TIPC_SOCKET_ADDR */
1493 msg_set_type(hdr, TIPC_DIRECT_MSG);
1494 msg_set_lookup_scope(hdr, 0);
1495 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1498 /* Add message body */
1499 __skb_queue_head_init(&pkts);
1500 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1501 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1502 if (unlikely(rc != dlen))
1504 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1505 __skb_queue_purge(&pkts);
1510 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1511 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1512 if (unlikely(rc == -ELINKCONG)) {
1513 tipc_dest_push(clinks, skaddr.node, 0);
1514 tsk->cong_link_cnt++;
1518 if (unlikely(syn && !rc))
1519 tipc_set_sk_state(sk, TIPC_CONNECTING);
1521 return rc ? rc : dlen;
1525 * tipc_sendstream - send stream-oriented data
1526 * @sock: socket structure
1528 * @dsz: total length of data to be transmitted
1530 * Used for SOCK_STREAM data.
1532 * Return: the number of bytes sent on success (or partial success),
1533 * or errno if no data sent
1535 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1537 struct sock *sk = sock->sk;
1541 ret = __tipc_sendstream(sock, m, dsz);
1547 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1549 struct sock *sk = sock->sk;
1550 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1551 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1552 struct sk_buff_head *txq = &sk->sk_write_queue;
1553 struct tipc_sock *tsk = tipc_sk(sk);
1554 struct tipc_msg *hdr = &tsk->phdr;
1555 struct net *net = sock_net(sk);
1556 struct sk_buff *skb;
1557 u32 dnode = tsk_peer_node(tsk);
1558 int maxnagle = tsk->maxnagle;
1559 int maxpkt = tsk->max_pkt;
1563 if (unlikely(dlen > INT_MAX))
1566 /* Handle implicit connection setup */
1567 if (unlikely(dest)) {
1568 rc = __tipc_sendmsg(sock, m, dlen);
1569 if (dlen && dlen == rc) {
1570 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1571 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1577 rc = tipc_wait_for_cond(sock, &timeout,
1578 (!tsk->cong_link_cnt &&
1579 !tsk_conn_cong(tsk) &&
1580 tipc_sk_connected(sk)));
1583 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1584 blocks = tsk->snd_backlog;
1585 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1587 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1588 if (unlikely(rc < 0))
1592 if (blocks <= 64 && tsk->expect_ack) {
1593 tsk->snd_backlog = blocks;
1596 } else if (blocks > 64) {
1597 tsk->pkt_cnt += skb_queue_len(txq);
1599 skb = skb_peek_tail(txq);
1601 msg_set_ack_required(buf_msg(skb));
1602 tsk->expect_ack = true;
1604 tsk->expect_ack = false;
1610 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1611 if (unlikely(rc != send))
1613 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1615 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1616 TIPC_DUMP_SK_SNDQ, " ");
1617 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1618 if (unlikely(rc == -ELINKCONG)) {
1619 tsk->cong_link_cnt = 1;
1623 tsk->snt_unacked += blocks;
1624 tsk->snd_backlog = 0;
1627 } while (sent < dlen && !rc);
1629 return sent ? sent : rc;
1633 * tipc_send_packet - send a connection-oriented message
1634 * @sock: socket structure
1635 * @m: message to send
1636 * @dsz: length of data to be transmitted
1638 * Used for SOCK_SEQPACKET messages.
1640 * Return: the number of bytes sent on success, or errno otherwise
1642 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1644 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1647 return tipc_sendstream(sock, m, dsz);
1650 /* tipc_sk_finish_conn - complete the setup of a connection
1652 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1655 struct sock *sk = &tsk->sk;
1656 struct net *net = sock_net(sk);
1657 struct tipc_msg *msg = &tsk->phdr;
1659 msg_set_syn(msg, 0);
1660 msg_set_destnode(msg, peer_node);
1661 msg_set_destport(msg, peer_port);
1662 msg_set_type(msg, TIPC_CONN_MSG);
1663 msg_set_lookup_scope(msg, 0);
1664 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1666 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1667 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1668 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1669 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1670 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1672 __skb_queue_purge(&sk->sk_write_queue);
1673 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1676 /* Fall back to message based flow control */
1677 tsk->rcv_win = FLOWCTL_MSG_WIN;
1678 tsk->snd_win = FLOWCTL_MSG_WIN;
1682 * tipc_sk_set_orig_addr - capture sender's address for received message
1683 * @m: descriptor for message info
1684 * @skb: received message
1686 * Note: Address is not captured if not requested by receiver.
1688 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1690 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1691 struct tipc_msg *hdr = buf_msg(skb);
1696 srcaddr->sock.family = AF_TIPC;
1697 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1698 srcaddr->sock.scope = 0;
1699 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1700 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1701 srcaddr->sock.addr.name.domain = 0;
1702 m->msg_namelen = sizeof(struct sockaddr_tipc);
1704 if (!msg_in_group(hdr))
1707 /* Group message users may also want to know sending member's id */
1708 srcaddr->member.family = AF_TIPC;
1709 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1710 srcaddr->member.scope = 0;
1711 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1712 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1713 srcaddr->member.addr.name.domain = 0;
1714 m->msg_namelen = sizeof(*srcaddr);
1718 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1719 * @m: descriptor for message info
1720 * @skb: received message buffer
1721 * @tsk: TIPC port associated with message
1723 * Note: Ancillary data is not captured if not requested by receiver.
1725 * Return: 0 if successful, otherwise errno
1727 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1728 struct tipc_sock *tsk)
1730 struct tipc_msg *hdr;
1735 if (likely(m->msg_controllen == 0))
1739 dlen = msg_data_sz(hdr);
1741 /* Capture errored message object, if any */
1742 if (msg_errcode(hdr)) {
1743 if (skb_linearize(skb))
1746 data[0] = msg_errcode(hdr);
1748 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1751 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1756 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1757 switch (msg_type(hdr)) {
1758 case TIPC_NAMED_MSG:
1760 data[0] = msg_nametype(hdr);
1761 data[1] = msg_namelower(hdr);
1764 case TIPC_MCAST_MSG:
1766 data[0] = msg_nametype(hdr);
1767 data[1] = msg_namelower(hdr);
1768 data[2] = msg_nameupper(hdr);
1771 has_addr = !!tsk->conn_addrtype;
1772 data[0] = msg_nametype(&tsk->phdr);
1773 data[1] = msg_nameinst(&tsk->phdr);
1781 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1784 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1786 struct sock *sk = &tsk->sk;
1787 struct sk_buff *skb = NULL;
1788 struct tipc_msg *msg;
1789 u32 peer_port = tsk_peer_port(tsk);
1790 u32 dnode = tsk_peer_node(tsk);
1792 if (!tipc_sk_connected(sk))
1794 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1795 dnode, tsk_own_node(tsk), peer_port,
1796 tsk->portid, TIPC_OK);
1800 msg_set_conn_ack(msg, tsk->rcv_unacked);
1801 tsk->rcv_unacked = 0;
1803 /* Adjust to and advertize the correct window limit */
1804 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1805 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1806 msg_set_adv_win(msg, tsk->rcv_win);
1811 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1813 struct sk_buff *skb;
1815 skb = tipc_sk_build_ack(tsk);
1819 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1820 msg_link_selector(buf_msg(skb)));
1823 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1825 struct sock *sk = sock->sk;
1826 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1827 long timeo = *timeop;
1828 int err = sock_error(sk);
1834 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1835 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1839 add_wait_queue(sk_sleep(sk), &wait);
1841 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1842 sched_annotate_sleep();
1844 remove_wait_queue(sk_sleep(sk), &wait);
1847 if (!skb_queue_empty(&sk->sk_receive_queue))
1852 err = sock_intr_errno(timeo);
1853 if (signal_pending(current))
1856 err = sock_error(sk);
1865 * tipc_recvmsg - receive packet-oriented message
1866 * @sock: network socket
1867 * @m: descriptor for message info
1868 * @buflen: length of user buffer area
1869 * @flags: receive flags
1871 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1872 * If the complete message doesn't fit in user area, truncate it.
1874 * Return: size of returned message data, errno otherwise
1876 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1877 size_t buflen, int flags)
1879 struct sock *sk = sock->sk;
1880 bool connected = !tipc_sk_type_connectionless(sk);
1881 struct tipc_sock *tsk = tipc_sk(sk);
1882 int rc, err, hlen, dlen, copy;
1883 struct sk_buff_head xmitq;
1884 struct tipc_msg *hdr;
1885 struct sk_buff *skb;
1889 /* Catch invalid receive requests */
1890 if (unlikely(!buflen))
1894 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1898 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1900 /* Step rcv queue to first msg with data or error; wait if necessary */
1902 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1905 skb = skb_peek(&sk->sk_receive_queue);
1907 dlen = msg_data_sz(hdr);
1908 hlen = msg_hdr_sz(hdr);
1909 err = msg_errcode(hdr);
1910 grp_evt = msg_is_grp_evt(hdr);
1911 if (likely(dlen || err))
1913 tsk_advance_rx_queue(sk);
1916 /* Collect msg meta data, including error code and rejected data */
1917 tipc_sk_set_orig_addr(m, skb);
1918 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1923 /* Capture data if non-error msg, otherwise just set return value */
1925 copy = min_t(int, dlen, buflen);
1926 if (unlikely(copy != dlen))
1927 m->msg_flags |= MSG_TRUNC;
1928 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1932 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1938 /* Mark message as group event if applicable */
1939 if (unlikely(grp_evt)) {
1940 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1941 m->msg_flags |= MSG_EOR;
1942 m->msg_flags |= MSG_OOB;
1946 /* Caption of data or error code/rejected data was successful */
1947 if (unlikely(flags & MSG_PEEK))
1950 /* Send group flow control advertisement when applicable */
1951 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1952 __skb_queue_head_init(&xmitq);
1953 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1954 msg_orignode(hdr), msg_origport(hdr),
1956 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1959 tsk_advance_rx_queue(sk);
1961 if (likely(!connected))
1964 /* Send connection flow control advertisement when applicable */
1965 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1966 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1967 tipc_sk_send_ack(tsk);
1970 return rc ? rc : copy;
1974 * tipc_recvstream - receive stream-oriented data
1975 * @sock: network socket
1976 * @m: descriptor for message info
1977 * @buflen: total size of user buffer area
1978 * @flags: receive flags
1980 * Used for SOCK_STREAM messages only. If not enough data is available
1981 * will optionally wait for more; never truncates data.
1983 * Return: size of returned message data, errno otherwise
1985 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1986 size_t buflen, int flags)
1988 struct sock *sk = sock->sk;
1989 struct tipc_sock *tsk = tipc_sk(sk);
1990 struct sk_buff *skb;
1991 struct tipc_msg *hdr;
1992 struct tipc_skb_cb *skb_cb;
1993 bool peek = flags & MSG_PEEK;
1994 int offset, required, copy, copied = 0;
1995 int hlen, dlen, err, rc;
1998 /* Catch invalid receive attempts */
1999 if (unlikely(!buflen))
2004 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2008 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2009 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2012 /* Look at first msg in receive queue; wait if necessary */
2013 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2016 skb = skb_peek(&sk->sk_receive_queue);
2017 skb_cb = TIPC_SKB_CB(skb);
2019 dlen = msg_data_sz(hdr);
2020 hlen = msg_hdr_sz(hdr);
2021 err = msg_errcode(hdr);
2023 /* Discard any empty non-errored (SYN-) message */
2024 if (unlikely(!dlen && !err)) {
2025 tsk_advance_rx_queue(sk);
2029 /* Collect msg meta data, incl. error code and rejected data */
2031 tipc_sk_set_orig_addr(m, skb);
2032 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2038 /* Copy data if msg ok, otherwise return error/partial data */
2040 offset = skb_cb->bytes_read;
2041 copy = min_t(int, dlen - offset, buflen - copied);
2042 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2047 if (unlikely(offset < dlen)) {
2049 skb_cb->bytes_read = offset;
2054 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2063 tsk_advance_rx_queue(sk);
2065 /* Send connection flow control advertisement when applicable */
2066 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2067 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2068 tipc_sk_send_ack(tsk);
2070 /* Exit if all requested data or FIN/error received */
2071 if (copied == buflen || err)
2074 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2077 return copied ? copied : rc;
2081 * tipc_write_space - wake up thread if port congestion is released
2084 static void tipc_write_space(struct sock *sk)
2086 struct socket_wq *wq;
2089 wq = rcu_dereference(sk->sk_wq);
2090 if (skwq_has_sleeper(wq))
2091 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2092 EPOLLWRNORM | EPOLLWRBAND);
2097 * tipc_data_ready - wake up threads to indicate messages have been received
2100 static void tipc_data_ready(struct sock *sk)
2102 struct socket_wq *wq;
2105 wq = rcu_dereference(sk->sk_wq);
2106 if (skwq_has_sleeper(wq))
2107 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2108 EPOLLRDNORM | EPOLLRDBAND);
2112 static void tipc_sock_destruct(struct sock *sk)
2114 __skb_queue_purge(&sk->sk_receive_queue);
2117 static void tipc_sk_proto_rcv(struct sock *sk,
2118 struct sk_buff_head *inputq,
2119 struct sk_buff_head *xmitq)
2121 struct sk_buff *skb = __skb_dequeue(inputq);
2122 struct tipc_sock *tsk = tipc_sk(sk);
2123 struct tipc_msg *hdr = buf_msg(skb);
2124 struct tipc_group *grp = tsk->group;
2125 bool wakeup = false;
2127 switch (msg_user(hdr)) {
2129 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2132 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2133 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2135 tsk->cong_link_cnt--;
2137 tipc_sk_push_backlog(tsk, false);
2139 case GROUP_PROTOCOL:
2140 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2143 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2144 hdr, inputq, xmitq);
2151 sk->sk_write_space(sk);
2157 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2159 * @skb: pointer to message buffer.
2160 * @xmitq: for Nagle ACK if any
2161 * Return: true if message should be added to receive queue, false otherwise
2163 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2164 struct sk_buff_head *xmitq)
2166 struct sock *sk = &tsk->sk;
2167 struct net *net = sock_net(sk);
2168 struct tipc_msg *hdr = buf_msg(skb);
2169 bool con_msg = msg_connected(hdr);
2170 u32 pport = tsk_peer_port(tsk);
2171 u32 pnode = tsk_peer_node(tsk);
2172 u32 oport = msg_origport(hdr);
2173 u32 onode = msg_orignode(hdr);
2174 int err = msg_errcode(hdr);
2175 unsigned long delay;
2177 if (unlikely(msg_mcast(hdr)))
2181 switch (sk->sk_state) {
2182 case TIPC_CONNECTING:
2184 if (likely(con_msg)) {
2187 tipc_sk_finish_conn(tsk, oport, onode);
2188 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2189 /* ACK+ message with data is added to receive queue */
2190 if (msg_data_sz(hdr))
2192 /* Empty ACK-, - wake up sleeping connect() and drop */
2193 sk->sk_state_change(sk);
2194 msg_set_dest_droppable(hdr, 1);
2197 /* Ignore connectionless message if not from listening socket */
2198 if (oport != pport || onode != pnode)
2202 if (err != TIPC_ERR_OVERLOAD)
2205 /* Prepare for new setup attempt if we have a SYN clone */
2206 if (skb_queue_empty(&sk->sk_write_queue))
2208 get_random_bytes(&delay, 2);
2209 delay %= (tsk->conn_timeout / 4);
2210 delay = msecs_to_jiffies(delay + 100);
2211 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2214 case TIPC_DISCONNECTING:
2217 /* Accept only SYN message */
2218 if (!msg_is_syn(hdr) &&
2219 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2221 if (!con_msg && !err)
2224 case TIPC_ESTABLISHED:
2225 if (!skb_queue_empty(&sk->sk_write_queue))
2226 tipc_sk_push_backlog(tsk, false);
2227 /* Accept only connection-based messages sent by peer */
2228 if (likely(con_msg && !err && pport == oport &&
2230 if (msg_ack_required(hdr)) {
2231 struct sk_buff *skb;
2233 skb = tipc_sk_build_ack(tsk);
2235 msg_set_nagle_ack(buf_msg(skb));
2236 __skb_queue_tail(xmitq, skb);
2241 if (!tsk_peer_msg(tsk, hdr))
2245 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2246 tipc_node_remove_conn(net, pnode, tsk->portid);
2247 sk->sk_state_change(sk);
2250 pr_err("Unknown sk_state %u\n", sk->sk_state);
2252 /* Abort connection setup attempt */
2253 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2254 sk->sk_err = ECONNREFUSED;
2255 sk->sk_state_change(sk);
2260 * rcvbuf_limit - get proper overload limit of socket receive queue
2264 * For connection oriented messages, irrespective of importance,
2265 * default queue limit is 2 MB.
2267 * For connectionless messages, queue limits are based on message
2268 * importance as follows:
2270 * TIPC_LOW_IMPORTANCE (2 MB)
2271 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2272 * TIPC_HIGH_IMPORTANCE (8 MB)
2273 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2275 * Return: overload limit according to corresponding message importance
2277 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2279 struct tipc_sock *tsk = tipc_sk(sk);
2280 struct tipc_msg *hdr = buf_msg(skb);
2282 if (unlikely(msg_in_group(hdr)))
2283 return READ_ONCE(sk->sk_rcvbuf);
2285 if (unlikely(!msg_connected(hdr)))
2286 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2288 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2289 return READ_ONCE(sk->sk_rcvbuf);
2291 return FLOWCTL_MSG_LIM;
2295 * tipc_sk_filter_rcv - validate incoming message
2297 * @skb: pointer to message.
2298 * @xmitq: output message area (FIXME)
2300 * Enqueues message on receive queue if acceptable; optionally handles
2301 * disconnect indication for a connected socket.
2303 * Called with socket lock already taken
2305 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2306 struct sk_buff_head *xmitq)
2308 bool sk_conn = !tipc_sk_type_connectionless(sk);
2309 struct tipc_sock *tsk = tipc_sk(sk);
2310 struct tipc_group *grp = tsk->group;
2311 struct tipc_msg *hdr = buf_msg(skb);
2312 struct net *net = sock_net(sk);
2313 struct sk_buff_head inputq;
2314 int mtyp = msg_type(hdr);
2315 int limit, err = TIPC_OK;
2317 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2318 TIPC_SKB_CB(skb)->bytes_read = 0;
2319 __skb_queue_head_init(&inputq);
2320 __skb_queue_tail(&inputq, skb);
2322 if (unlikely(!msg_isdata(hdr)))
2323 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2326 tipc_group_filter_msg(grp, &inputq, xmitq);
2328 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2329 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2331 /* Validate and add to receive buffer if there is space */
2332 while ((skb = __skb_dequeue(&inputq))) {
2334 limit = rcvbuf_limit(sk, skb);
2335 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2336 (!sk_conn && msg_connected(hdr)) ||
2337 (!grp && msg_in_group(hdr)))
2338 err = TIPC_ERR_NO_PORT;
2339 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2340 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2342 atomic_inc(&sk->sk_drops);
2343 err = TIPC_ERR_OVERLOAD;
2346 if (unlikely(err)) {
2347 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2348 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2350 __skb_queue_tail(xmitq, skb);
2355 __skb_queue_tail(&sk->sk_receive_queue, skb);
2356 skb_set_owner_r(skb, sk);
2357 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2358 "rcvq >90% allocated!");
2359 sk->sk_data_ready(sk);
2364 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2368 * Caller must hold socket lock
2370 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2372 unsigned int before = sk_rmem_alloc_get(sk);
2373 struct sk_buff_head xmitq;
2376 __skb_queue_head_init(&xmitq);
2378 tipc_sk_filter_rcv(sk, skb, &xmitq);
2379 added = sk_rmem_alloc_get(sk) - before;
2380 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2382 /* Send pending response/rejected messages, if any */
2383 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2388 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2389 * inputq and try adding them to socket or backlog queue
2390 * @inputq: list of incoming buffers with potentially different destinations
2391 * @sk: socket where the buffers should be enqueued
2392 * @dport: port number for the socket
2393 * @xmitq: output queue
2395 * Caller must hold socket lock
2397 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2398 u32 dport, struct sk_buff_head *xmitq)
2400 unsigned long time_limit = jiffies + 2;
2401 struct sk_buff *skb;
2406 while (skb_queue_len(inputq)) {
2407 if (unlikely(time_after_eq(jiffies, time_limit)))
2410 skb = tipc_skb_dequeue(inputq, dport);
2414 /* Add message directly to receive queue if possible */
2415 if (!sock_owned_by_user(sk)) {
2416 tipc_sk_filter_rcv(sk, skb, xmitq);
2420 /* Try backlog, compensating for double-counted bytes */
2421 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2422 if (!sk->sk_backlog.len)
2423 atomic_set(dcnt, 0);
2424 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2425 if (likely(!sk_add_backlog(sk, skb, lim))) {
2426 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2427 "bklg & rcvq >90% allocated!");
2431 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2432 /* Overload => reject message back to sender */
2433 onode = tipc_own_addr(sock_net(sk));
2434 atomic_inc(&sk->sk_drops);
2435 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2436 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2438 __skb_queue_tail(xmitq, skb);
2445 * tipc_sk_rcv - handle a chain of incoming buffers
2446 * @net: the associated network namespace
2447 * @inputq: buffer list containing the buffers
2448 * Consumes all buffers in list until inputq is empty
2449 * Note: may be called in multiple threads referring to the same queue
2451 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2453 struct sk_buff_head xmitq;
2454 u32 dnode, dport = 0;
2456 struct tipc_sock *tsk;
2458 struct sk_buff *skb;
2460 __skb_queue_head_init(&xmitq);
2461 while (skb_queue_len(inputq)) {
2462 dport = tipc_skb_peek_port(inputq, dport);
2463 tsk = tipc_sk_lookup(net, dport);
2467 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2468 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2469 spin_unlock_bh(&sk->sk_lock.slock);
2471 /* Send pending response/rejected messages, if any */
2472 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2476 /* No destination socket => dequeue skb if still there */
2477 skb = tipc_skb_dequeue(inputq, dport);
2481 /* Try secondary lookup if unresolved named message */
2482 err = TIPC_ERR_NO_PORT;
2483 if (tipc_msg_lookup_dest(net, skb, &err))
2486 /* Prepare for message rejection */
2487 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2490 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2492 dnode = msg_destnode(buf_msg(skb));
2493 tipc_node_xmit_skb(net, skb, dnode, dport);
2497 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2499 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2500 struct sock *sk = sock->sk;
2504 int err = sock_error(sk);
2509 if (signal_pending(current))
2510 return sock_intr_errno(*timeo_p);
2511 if (sk->sk_state == TIPC_DISCONNECTING)
2514 add_wait_queue(sk_sleep(sk), &wait);
2515 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2517 remove_wait_queue(sk_sleep(sk), &wait);
2522 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2524 if (addr->family != AF_TIPC)
2526 if (addr->addrtype == TIPC_SERVICE_RANGE)
2527 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2528 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2529 addr->addrtype == TIPC_SOCKET_ADDR);
2533 * tipc_connect - establish a connection to another TIPC port
2534 * @sock: socket structure
2535 * @dest: socket address for destination port
2536 * @destlen: size of socket address data structure
2537 * @flags: file-related flags associated with socket
2539 * Return: 0 on success, errno otherwise
2541 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2542 int destlen, int flags)
2544 struct sock *sk = sock->sk;
2545 struct tipc_sock *tsk = tipc_sk(sk);
2546 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2547 struct msghdr m = {NULL,};
2548 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2552 if (destlen != sizeof(struct sockaddr_tipc))
2562 if (dst->family == AF_UNSPEC) {
2563 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2564 if (!tipc_sk_type_connectionless(sk))
2568 if (!tipc_sockaddr_is_sane(dst)) {
2572 /* DGRAM/RDM connect(), just save the destaddr */
2573 if (tipc_sk_type_connectionless(sk)) {
2574 memcpy(&tsk->peer, dest, destlen);
2576 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2581 previous = sk->sk_state;
2583 switch (sk->sk_state) {
2585 /* Send a 'SYN-' to destination */
2587 m.msg_namelen = destlen;
2589 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2590 * indicate send_msg() is never blocked.
2593 m.msg_flags = MSG_DONTWAIT;
2595 res = __tipc_sendmsg(sock, &m, 0);
2596 if ((res < 0) && (res != -EWOULDBLOCK))
2599 /* Just entered TIPC_CONNECTING state; the only
2600 * difference is that return value in non-blocking
2601 * case is EINPROGRESS, rather than EALREADY.
2605 case TIPC_CONNECTING:
2607 if (previous == TIPC_CONNECTING)
2611 timeout = msecs_to_jiffies(timeout);
2612 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2613 res = tipc_wait_for_connect(sock, &timeout);
2615 case TIPC_ESTABLISHED:
2628 * tipc_listen - allow socket to listen for incoming connections
2629 * @sock: socket structure
2632 * Return: 0 on success, errno otherwise
2634 static int tipc_listen(struct socket *sock, int len)
2636 struct sock *sk = sock->sk;
2640 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2646 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2648 struct sock *sk = sock->sk;
2652 /* True wake-one mechanism for incoming connections: only
2653 * one process gets woken up, not the 'whole herd'.
2654 * Since we do not 'race & poll' for established sockets
2655 * anymore, the common case will execute the loop only once.
2658 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2659 TASK_INTERRUPTIBLE);
2660 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2662 timeo = schedule_timeout(timeo);
2666 if (!skb_queue_empty(&sk->sk_receive_queue))
2671 err = sock_intr_errno(timeo);
2672 if (signal_pending(current))
2675 finish_wait(sk_sleep(sk), &wait);
2680 * tipc_accept - wait for connection request
2681 * @sock: listening socket
2682 * @new_sock: new socket that is to be connected
2683 * @flags: file-related flags associated with socket
2684 * @kern: caused by kernel or by userspace?
2686 * Return: 0 on success, errno otherwise
2688 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2691 struct sock *new_sk, *sk = sock->sk;
2692 struct sk_buff *buf;
2693 struct tipc_sock *new_tsock;
2694 struct tipc_msg *msg;
2700 if (sk->sk_state != TIPC_LISTEN) {
2704 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2705 res = tipc_wait_for_accept(sock, timeo);
2709 buf = skb_peek(&sk->sk_receive_queue);
2711 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2714 security_sk_clone(sock->sk, new_sock->sk);
2716 new_sk = new_sock->sk;
2717 new_tsock = tipc_sk(new_sk);
2720 /* we lock on new_sk; but lockdep sees the lock on sk */
2721 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2724 * Reject any stray messages received by new socket
2725 * before the socket lock was taken (very, very unlikely)
2727 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2729 /* Connect new socket to it's peer */
2730 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2732 tsk_set_importance(new_sk, msg_importance(msg));
2733 if (msg_named(msg)) {
2734 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2735 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2736 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2740 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2741 * Respond to 'SYN+' by queuing it on new socket.
2743 if (!msg_data_sz(msg)) {
2744 struct msghdr m = {NULL,};
2746 tsk_advance_rx_queue(sk);
2747 __tipc_sendstream(new_sock, &m, 0);
2749 __skb_dequeue(&sk->sk_receive_queue);
2750 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2751 skb_set_owner_r(buf, new_sk);
2753 release_sock(new_sk);
2760 * tipc_shutdown - shutdown socket connection
2761 * @sock: socket structure
2762 * @how: direction to close (must be SHUT_RDWR)
2764 * Terminates connection (if necessary), then purges socket's receive queue.
2766 * Return: 0 on success, errno otherwise
2768 static int tipc_shutdown(struct socket *sock, int how)
2770 struct sock *sk = sock->sk;
2773 if (how != SHUT_RDWR)
2778 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2779 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2780 sk->sk_shutdown = SHUTDOWN_MASK;
2782 if (sk->sk_state == TIPC_DISCONNECTING) {
2783 /* Discard any unreceived messages */
2784 __skb_queue_purge(&sk->sk_receive_queue);
2790 /* Wake up anyone sleeping in poll. */
2791 sk->sk_state_change(sk);
2797 static void tipc_sk_check_probing_state(struct sock *sk,
2798 struct sk_buff_head *list)
2800 struct tipc_sock *tsk = tipc_sk(sk);
2801 u32 pnode = tsk_peer_node(tsk);
2802 u32 pport = tsk_peer_port(tsk);
2803 u32 self = tsk_own_node(tsk);
2804 u32 oport = tsk->portid;
2805 struct sk_buff *skb;
2807 if (tsk->probe_unacked) {
2808 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2809 sk->sk_err = ECONNABORTED;
2810 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2811 sk->sk_state_change(sk);
2814 /* Prepare new probe */
2815 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2816 pnode, self, pport, oport, TIPC_OK);
2818 __skb_queue_tail(list, skb);
2819 tsk->probe_unacked = true;
2820 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2823 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2825 struct tipc_sock *tsk = tipc_sk(sk);
2827 /* Try again later if dest link is congested */
2828 if (tsk->cong_link_cnt) {
2829 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2832 /* Prepare SYN for retransmit */
2833 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2836 static void tipc_sk_timeout(struct timer_list *t)
2838 struct sock *sk = from_timer(sk, t, sk_timer);
2839 struct tipc_sock *tsk = tipc_sk(sk);
2840 u32 pnode = tsk_peer_node(tsk);
2841 struct sk_buff_head list;
2844 __skb_queue_head_init(&list);
2847 /* Try again later if socket is busy */
2848 if (sock_owned_by_user(sk)) {
2849 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2855 if (sk->sk_state == TIPC_ESTABLISHED)
2856 tipc_sk_check_probing_state(sk, &list);
2857 else if (sk->sk_state == TIPC_CONNECTING)
2858 tipc_sk_retry_connect(sk, &list);
2862 if (!skb_queue_empty(&list))
2863 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2865 /* SYN messages may cause link congestion */
2866 if (rc == -ELINKCONG) {
2867 tipc_dest_push(&tsk->cong_links, pnode, 0);
2868 tsk->cong_link_cnt = 1;
2873 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2875 struct sock *sk = &tsk->sk;
2876 struct net *net = sock_net(sk);
2877 struct tipc_socket_addr skaddr;
2878 struct publication *p;
2881 if (tipc_sk_connected(sk))
2883 key = tsk->portid + tsk->pub_count + 1;
2884 if (key == tsk->portid)
2886 skaddr.ref = tsk->portid;
2887 skaddr.node = tipc_own_addr(net);
2888 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2892 list_add(&p->binding_sock, &tsk->publications);
2894 tsk->published = true;
2898 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2900 struct net *net = sock_net(&tsk->sk);
2901 struct publication *safe, *p;
2902 struct tipc_uaddr _ua;
2905 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2907 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2908 p->sr.type, p->sr.lower, p->sr.upper);
2909 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2912 /* Unbind specific publication */
2913 if (p->scope != ua->scope)
2915 if (p->sr.type != ua->sr.type)
2917 if (p->sr.lower != ua->sr.lower)
2919 if (p->sr.upper != ua->sr.upper)
2921 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2925 if (list_empty(&tsk->publications)) {
2932 /* tipc_sk_reinit: set non-zero address in all existing sockets
2933 * when we go from standalone to network mode.
2935 void tipc_sk_reinit(struct net *net)
2937 struct tipc_net *tn = net_generic(net, tipc_net_id);
2938 struct rhashtable_iter iter;
2939 struct tipc_sock *tsk;
2940 struct tipc_msg *msg;
2942 rhashtable_walk_enter(&tn->sk_rht, &iter);
2945 rhashtable_walk_start(&iter);
2947 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2948 sock_hold(&tsk->sk);
2949 rhashtable_walk_stop(&iter);
2950 lock_sock(&tsk->sk);
2952 msg_set_prevnode(msg, tipc_own_addr(net));
2953 msg_set_orignode(msg, tipc_own_addr(net));
2954 release_sock(&tsk->sk);
2955 rhashtable_walk_start(&iter);
2959 rhashtable_walk_stop(&iter);
2960 } while (tsk == ERR_PTR(-EAGAIN));
2962 rhashtable_walk_exit(&iter);
2965 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2967 struct tipc_net *tn = net_generic(net, tipc_net_id);
2968 struct tipc_sock *tsk;
2971 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2973 sock_hold(&tsk->sk);
2979 static int tipc_sk_insert(struct tipc_sock *tsk)
2981 struct sock *sk = &tsk->sk;
2982 struct net *net = sock_net(sk);
2983 struct tipc_net *tn = net_generic(net, tipc_net_id);
2984 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2985 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2987 while (remaining--) {
2989 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2990 portid = TIPC_MIN_PORT;
2991 tsk->portid = portid;
2992 sock_hold(&tsk->sk);
2993 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3002 static void tipc_sk_remove(struct tipc_sock *tsk)
3004 struct sock *sk = &tsk->sk;
3005 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3007 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3008 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3013 static const struct rhashtable_params tsk_rht_params = {
3015 .head_offset = offsetof(struct tipc_sock, node),
3016 .key_offset = offsetof(struct tipc_sock, portid),
3017 .key_len = sizeof(u32), /* portid */
3018 .max_size = 1048576,
3020 .automatic_shrinking = true,
3023 int tipc_sk_rht_init(struct net *net)
3025 struct tipc_net *tn = net_generic(net, tipc_net_id);
3027 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3030 void tipc_sk_rht_destroy(struct net *net)
3032 struct tipc_net *tn = net_generic(net, tipc_net_id);
3034 /* Wait for socket readers to complete */
3037 rhashtable_destroy(&tn->sk_rht);
3040 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3042 struct net *net = sock_net(&tsk->sk);
3043 struct tipc_group *grp = tsk->group;
3044 struct tipc_msg *hdr = &tsk->phdr;
3045 struct tipc_uaddr ua;
3048 if (mreq->type < TIPC_RESERVED_TYPES)
3050 if (mreq->scope > TIPC_NODE_SCOPE)
3052 if (mreq->scope != TIPC_NODE_SCOPE)
3053 mreq->scope = TIPC_CLUSTER_SCOPE;
3056 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3060 msg_set_lookup_scope(hdr, mreq->scope);
3061 msg_set_nametype(hdr, mreq->type);
3062 msg_set_dest_droppable(hdr, true);
3063 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3064 mreq->type, mreq->instance, mreq->instance);
3065 tipc_nametbl_build_group(net, grp, &ua);
3066 rc = tipc_sk_publish(tsk, &ua);
3068 tipc_group_delete(net, grp);
3072 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3073 tsk->mc_method.rcast = true;
3074 tsk->mc_method.mandatory = true;
3075 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3079 static int tipc_sk_leave(struct tipc_sock *tsk)
3081 struct net *net = sock_net(&tsk->sk);
3082 struct tipc_group *grp = tsk->group;
3083 struct tipc_uaddr ua;
3088 ua.addrtype = TIPC_SERVICE_RANGE;
3089 tipc_group_self(grp, &ua.sr, &scope);
3091 tipc_group_delete(net, grp);
3093 tipc_sk_withdraw(tsk, &ua);
3098 * tipc_setsockopt - set socket option
3099 * @sock: socket structure
3100 * @lvl: option level
3101 * @opt: option identifier
3102 * @ov: pointer to new option value
3103 * @ol: length of option value
3105 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3106 * (to ease compatibility).
3108 * Return: 0 on success, errno otherwise
3110 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3111 sockptr_t ov, unsigned int ol)
3113 struct sock *sk = sock->sk;
3114 struct tipc_sock *tsk = tipc_sk(sk);
3115 struct tipc_group_req mreq;
3119 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3121 if (lvl != SOL_TIPC)
3122 return -ENOPROTOOPT;
3125 case TIPC_IMPORTANCE:
3126 case TIPC_SRC_DROPPABLE:
3127 case TIPC_DEST_DROPPABLE:
3128 case TIPC_CONN_TIMEOUT:
3130 if (ol < sizeof(value))
3132 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3135 case TIPC_GROUP_JOIN:
3136 if (ol < sizeof(mreq))
3138 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3142 if (!sockptr_is_null(ov) || ol)
3149 case TIPC_IMPORTANCE:
3150 res = tsk_set_importance(sk, value);
3152 case TIPC_SRC_DROPPABLE:
3153 if (sock->type != SOCK_STREAM)
3154 tsk_set_unreliable(tsk, value);
3158 case TIPC_DEST_DROPPABLE:
3159 tsk_set_unreturnable(tsk, value);
3161 case TIPC_CONN_TIMEOUT:
3162 tipc_sk(sk)->conn_timeout = value;
3164 case TIPC_MCAST_BROADCAST:
3165 tsk->mc_method.rcast = false;
3166 tsk->mc_method.mandatory = true;
3168 case TIPC_MCAST_REPLICAST:
3169 tsk->mc_method.rcast = true;
3170 tsk->mc_method.mandatory = true;
3172 case TIPC_GROUP_JOIN:
3173 res = tipc_sk_join(tsk, &mreq);
3175 case TIPC_GROUP_LEAVE:
3176 res = tipc_sk_leave(tsk);
3179 tsk->nodelay = !!value;
3192 * tipc_getsockopt - get socket option
3193 * @sock: socket structure
3194 * @lvl: option level
3195 * @opt: option identifier
3196 * @ov: receptacle for option value
3197 * @ol: receptacle for length of option value
3199 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3200 * (to ease compatibility).
3202 * Return: 0 on success, errno otherwise
3204 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3205 char __user *ov, int __user *ol)
3207 struct sock *sk = sock->sk;
3208 struct tipc_sock *tsk = tipc_sk(sk);
3209 struct tipc_service_range seq;
3214 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3215 return put_user(0, ol);
3216 if (lvl != SOL_TIPC)
3217 return -ENOPROTOOPT;
3218 res = get_user(len, ol);
3225 case TIPC_IMPORTANCE:
3226 value = tsk_importance(tsk);
3228 case TIPC_SRC_DROPPABLE:
3229 value = tsk_unreliable(tsk);
3231 case TIPC_DEST_DROPPABLE:
3232 value = tsk_unreturnable(tsk);
3234 case TIPC_CONN_TIMEOUT:
3235 value = tsk->conn_timeout;
3236 /* no need to set "res", since already 0 at this point */
3238 case TIPC_NODE_RECVQ_DEPTH:
3239 value = 0; /* was tipc_queue_size, now obsolete */
3241 case TIPC_SOCK_RECVQ_DEPTH:
3242 value = skb_queue_len(&sk->sk_receive_queue);
3244 case TIPC_SOCK_RECVQ_USED:
3245 value = sk_rmem_alloc_get(sk);
3247 case TIPC_GROUP_JOIN:
3250 tipc_group_self(tsk->group, &seq, &scope);
3260 return res; /* "get" failed */
3262 if (len < sizeof(value))
3265 if (copy_to_user(ov, &value, sizeof(value)))
3268 return put_user(sizeof(value), ol);
3271 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3273 struct net *net = sock_net(sock->sk);
3274 struct tipc_sioc_nodeid_req nr = {0};
3275 struct tipc_sioc_ln_req lnr;
3276 void __user *argp = (void __user *)arg;
3279 case SIOCGETLINKNAME:
3280 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3282 if (!tipc_node_get_linkname(net,
3283 lnr.bearer_id & 0xffff, lnr.peer,
3284 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3285 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3289 return -EADDRNOTAVAIL;
3291 if (copy_from_user(&nr, argp, sizeof(nr)))
3293 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3294 return -EADDRNOTAVAIL;
3295 if (copy_to_user(argp, &nr, sizeof(nr)))
3299 return -ENOIOCTLCMD;
3303 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3305 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3306 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3307 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3309 tsk1->peer.family = AF_TIPC;
3310 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3311 tsk1->peer.scope = TIPC_NODE_SCOPE;
3312 tsk1->peer.addr.id.ref = tsk2->portid;
3313 tsk1->peer.addr.id.node = onode;
3314 tsk2->peer.family = AF_TIPC;
3315 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3316 tsk2->peer.scope = TIPC_NODE_SCOPE;
3317 tsk2->peer.addr.id.ref = tsk1->portid;
3318 tsk2->peer.addr.id.node = onode;
3320 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3321 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3325 /* Protocol switches for the various types of TIPC sockets */
3327 static const struct proto_ops msg_ops = {
3328 .owner = THIS_MODULE,
3330 .release = tipc_release,
3332 .connect = tipc_connect,
3333 .socketpair = tipc_socketpair,
3334 .accept = sock_no_accept,
3335 .getname = tipc_getname,
3337 .ioctl = tipc_ioctl,
3338 .listen = sock_no_listen,
3339 .shutdown = tipc_shutdown,
3340 .setsockopt = tipc_setsockopt,
3341 .getsockopt = tipc_getsockopt,
3342 .sendmsg = tipc_sendmsg,
3343 .recvmsg = tipc_recvmsg,
3344 .mmap = sock_no_mmap,
3345 .sendpage = sock_no_sendpage
3348 static const struct proto_ops packet_ops = {
3349 .owner = THIS_MODULE,
3351 .release = tipc_release,
3353 .connect = tipc_connect,
3354 .socketpair = tipc_socketpair,
3355 .accept = tipc_accept,
3356 .getname = tipc_getname,
3358 .ioctl = tipc_ioctl,
3359 .listen = tipc_listen,
3360 .shutdown = tipc_shutdown,
3361 .setsockopt = tipc_setsockopt,
3362 .getsockopt = tipc_getsockopt,
3363 .sendmsg = tipc_send_packet,
3364 .recvmsg = tipc_recvmsg,
3365 .mmap = sock_no_mmap,
3366 .sendpage = sock_no_sendpage
3369 static const struct proto_ops stream_ops = {
3370 .owner = THIS_MODULE,
3372 .release = tipc_release,
3374 .connect = tipc_connect,
3375 .socketpair = tipc_socketpair,
3376 .accept = tipc_accept,
3377 .getname = tipc_getname,
3379 .ioctl = tipc_ioctl,
3380 .listen = tipc_listen,
3381 .shutdown = tipc_shutdown,
3382 .setsockopt = tipc_setsockopt,
3383 .getsockopt = tipc_getsockopt,
3384 .sendmsg = tipc_sendstream,
3385 .recvmsg = tipc_recvstream,
3386 .mmap = sock_no_mmap,
3387 .sendpage = sock_no_sendpage
3390 static const struct net_proto_family tipc_family_ops = {
3391 .owner = THIS_MODULE,
3393 .create = tipc_sk_create
3396 static struct proto tipc_proto = {
3398 .owner = THIS_MODULE,
3399 .obj_size = sizeof(struct tipc_sock),
3400 .sysctl_rmem = sysctl_tipc_rmem
3404 * tipc_socket_init - initialize TIPC socket interface
3406 * Return: 0 on success, errno otherwise
3408 int tipc_socket_init(void)
3412 res = proto_register(&tipc_proto, 1);
3414 pr_err("Failed to register TIPC protocol type\n");
3418 res = sock_register(&tipc_family_ops);
3420 pr_err("Failed to register TIPC socket type\n");
3421 proto_unregister(&tipc_proto);
3429 * tipc_socket_stop - stop TIPC socket interface
3431 void tipc_socket_stop(void)
3433 sock_unregister(tipc_family_ops.family);
3434 proto_unregister(&tipc_proto);
3437 /* Caller should hold socket lock for the passed tipc socket. */
3438 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3440 u32 peer_node, peer_port;
3441 u32 conn_type, conn_instance;
3442 struct nlattr *nest;
3444 peer_node = tsk_peer_node(tsk);
3445 peer_port = tsk_peer_port(tsk);
3446 conn_type = msg_nametype(&tsk->phdr);
3447 conn_instance = msg_nameinst(&tsk->phdr);
3448 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3452 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3454 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3457 if (tsk->conn_addrtype != 0) {
3458 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3460 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3462 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3465 nla_nest_end(skb, nest);
3470 nla_nest_cancel(skb, nest);
3475 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3478 struct net *net = sock_net(skb->sk);
3479 struct sock *sk = &tsk->sk;
3481 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3482 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3485 if (tipc_sk_connected(sk)) {
3486 if (__tipc_nl_add_sk_con(skb, tsk))
3488 } else if (!list_empty(&tsk->publications)) {
3489 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3495 /* Caller should hold socket lock for the passed tipc socket. */
3496 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3497 struct tipc_sock *tsk)
3499 struct nlattr *attrs;
3502 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3503 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3507 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3509 goto genlmsg_cancel;
3511 if (__tipc_nl_add_sk_info(skb, tsk))
3512 goto attr_msg_cancel;
3514 nla_nest_end(skb, attrs);
3515 genlmsg_end(skb, hdr);
3520 nla_nest_cancel(skb, attrs);
3522 genlmsg_cancel(skb, hdr);
3527 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3528 int (*skb_handler)(struct sk_buff *skb,
3529 struct netlink_callback *cb,
3530 struct tipc_sock *tsk))
3532 struct rhashtable_iter *iter = (void *)cb->args[4];
3533 struct tipc_sock *tsk;
3536 rhashtable_walk_start(iter);
3537 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3540 if (err == -EAGAIN) {
3547 sock_hold(&tsk->sk);
3548 rhashtable_walk_stop(iter);
3549 lock_sock(&tsk->sk);
3550 err = skb_handler(skb, cb, tsk);
3552 release_sock(&tsk->sk);
3556 release_sock(&tsk->sk);
3557 rhashtable_walk_start(iter);
3560 rhashtable_walk_stop(iter);
3564 EXPORT_SYMBOL(tipc_nl_sk_walk);
3566 int tipc_dump_start(struct netlink_callback *cb)
3568 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3570 EXPORT_SYMBOL(tipc_dump_start);
3572 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3574 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3575 struct rhashtable_iter *iter = (void *)cb->args[4];
3576 struct tipc_net *tn = tipc_net(net);
3579 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3583 cb->args[4] = (long)iter;
3586 rhashtable_walk_enter(&tn->sk_rht, iter);
3590 int tipc_dump_done(struct netlink_callback *cb)
3592 struct rhashtable_iter *hti = (void *)cb->args[4];
3594 rhashtable_walk_exit(hti);
3598 EXPORT_SYMBOL(tipc_dump_done);
3600 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3601 struct tipc_sock *tsk, u32 sk_filter_state,
3602 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3604 struct sock *sk = &tsk->sk;
3605 struct nlattr *attrs;
3606 struct nlattr *stat;
3608 /*filter response w.r.t sk_state*/
3609 if (!(sk_filter_state & (1 << sk->sk_state)))
3612 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3616 if (__tipc_nl_add_sk_info(skb, tsk))
3617 goto attr_msg_cancel;
3619 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3620 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3621 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3622 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3623 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3625 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3626 tipc_diag_gen_cookie(sk),
3628 goto attr_msg_cancel;
3630 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3632 goto attr_msg_cancel;
3634 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3635 skb_queue_len(&sk->sk_receive_queue)) ||
3636 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3637 skb_queue_len(&sk->sk_write_queue)) ||
3638 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3639 atomic_read(&sk->sk_drops)))
3640 goto stat_msg_cancel;
3642 if (tsk->cong_link_cnt &&
3643 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3644 goto stat_msg_cancel;
3646 if (tsk_conn_cong(tsk) &&
3647 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3648 goto stat_msg_cancel;
3650 nla_nest_end(skb, stat);
3653 if (tipc_group_fill_sock_diag(tsk->group, skb))
3654 goto stat_msg_cancel;
3656 nla_nest_end(skb, attrs);
3661 nla_nest_cancel(skb, stat);
3663 nla_nest_cancel(skb, attrs);
3667 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3669 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3671 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3674 /* Caller should hold socket lock for the passed tipc socket. */
3675 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3676 struct netlink_callback *cb,
3677 struct publication *publ)
3680 struct nlattr *attrs;
3682 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3683 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3687 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3689 goto genlmsg_cancel;
3691 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3692 goto attr_msg_cancel;
3693 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3694 goto attr_msg_cancel;
3695 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3696 goto attr_msg_cancel;
3697 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3698 goto attr_msg_cancel;
3700 nla_nest_end(skb, attrs);
3701 genlmsg_end(skb, hdr);
3706 nla_nest_cancel(skb, attrs);
3708 genlmsg_cancel(skb, hdr);
3713 /* Caller should hold socket lock for the passed tipc socket. */
3714 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3715 struct netlink_callback *cb,
3716 struct tipc_sock *tsk, u32 *last_publ)
3719 struct publication *p;
3722 list_for_each_entry(p, &tsk->publications, binding_sock) {
3723 if (p->key == *last_publ)
3726 if (p->key != *last_publ) {
3727 /* We never set seq or call nl_dump_check_consistent()
3728 * this means that setting prev_seq here will cause the
3729 * consistence check to fail in the netlink callback
3730 * handler. Resulting in the last NLMSG_DONE message
3731 * having the NLM_F_DUMP_INTR flag set.
3738 p = list_first_entry(&tsk->publications, struct publication,
3742 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3743 err = __tipc_nl_add_sk_publ(skb, cb, p);
3745 *last_publ = p->key;
3754 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3757 u32 tsk_portid = cb->args[0];
3758 u32 last_publ = cb->args[1];
3759 u32 done = cb->args[2];
3760 struct net *net = sock_net(skb->sk);
3761 struct tipc_sock *tsk;
3764 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3765 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3767 if (!attrs[TIPC_NLA_SOCK])
3770 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3771 attrs[TIPC_NLA_SOCK],
3772 tipc_nl_sock_policy, NULL);
3776 if (!sock[TIPC_NLA_SOCK_REF])
3779 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3785 tsk = tipc_sk_lookup(net, tsk_portid);
3789 lock_sock(&tsk->sk);
3790 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3793 release_sock(&tsk->sk);
3796 cb->args[0] = tsk_portid;
3797 cb->args[1] = last_publ;
3804 * tipc_sk_filtering - check if a socket should be traced
3805 * @sk: the socket to be examined
3807 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3808 * (portid, sock type, name type, name lower, name upper)
3810 * Return: true if the socket meets the socket tuple data
3811 * (value 0 = 'any') or when there is no tuple set (all = 0),
3814 bool tipc_sk_filtering(struct sock *sk)
3816 struct tipc_sock *tsk;
3817 struct publication *p;
3818 u32 _port, _sktype, _type, _lower, _upper;
3819 u32 type = 0, lower = 0, upper = 0;
3826 _port = sysctl_tipc_sk_filter[0];
3827 _sktype = sysctl_tipc_sk_filter[1];
3828 _type = sysctl_tipc_sk_filter[2];
3829 _lower = sysctl_tipc_sk_filter[3];
3830 _upper = sysctl_tipc_sk_filter[4];
3832 if (!_port && !_sktype && !_type && !_lower && !_upper)
3836 return (_port == tsk->portid);
3838 if (_sktype && _sktype != sk->sk_type)
3841 if (tsk->published) {
3842 p = list_first_entry_or_null(&tsk->publications,
3843 struct publication, binding_sock);
3846 lower = p->sr.lower;
3847 upper = p->sr.upper;
3851 if (!tipc_sk_type_connectionless(sk)) {
3852 type = msg_nametype(&tsk->phdr);
3853 lower = msg_nameinst(&tsk->phdr);
3857 if ((_type && _type != type) || (_lower && _lower != lower) ||
3858 (_upper && _upper != upper))
3864 u32 tipc_sock_get_portid(struct sock *sk)
3866 return (sk) ? (tipc_sk(sk))->portid : 0;
3870 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3871 * both the rcv and backlog queues are considered
3872 * @sk: tipc sk to be checked
3873 * @skb: tipc msg to be checked
3875 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3878 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3880 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3881 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3882 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3884 return (qsize > lim * 90 / 100);
3888 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3889 * only the rcv queue is considered
3890 * @sk: tipc sk to be checked
3891 * @skb: tipc msg to be checked
3893 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3896 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3898 unsigned int lim = rcvbuf_limit(sk, skb);
3899 unsigned int qsize = sk_rmem_alloc_get(sk);
3901 return (qsize > lim * 90 / 100);
3905 * tipc_sk_dump - dump TIPC socket
3906 * @sk: tipc sk to be dumped
3907 * @dqueues: bitmask to decide if any socket queue to be dumped?
3908 * - TIPC_DUMP_NONE: don't dump socket queues
3909 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3910 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3911 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3912 * - TIPC_DUMP_ALL: dump all the socket queues above
3913 * @buf: returned buffer of dump data in format
3915 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3918 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3919 u32 conn_type, conn_instance;
3920 struct tipc_sock *tsk;
3921 struct publication *p;
3925 i += scnprintf(buf, sz, "sk data: (null)\n");
3930 tsk_connected = !tipc_sk_type_connectionless(sk);
3932 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3933 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3934 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3935 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3936 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3937 if (tsk_connected) {
3938 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3939 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3940 conn_type = msg_nametype(&tsk->phdr);
3941 conn_instance = msg_nameinst(&tsk->phdr);
3942 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3943 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3945 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3946 if (tsk->published) {
3947 p = list_first_entry_or_null(&tsk->publications,
3948 struct publication, binding_sock);
3949 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3950 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3951 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3953 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3954 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3955 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3956 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3957 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3958 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3959 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3960 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3961 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3962 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3963 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3964 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3965 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3966 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3968 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3969 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3970 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3973 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3974 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3975 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3978 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
3979 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
3980 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
3981 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
3982 i += scnprintf(buf + i, sz - i, " tail ");
3983 i += tipc_skb_dump(sk->sk_backlog.tail, false,