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
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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>
40 #include <trace/events/sock.h>
43 #include "name_table.h"
46 #include "name_distr.h"
53 #define NAGLE_START_INIT 4
54 #define NAGLE_START_MAX 1024
55 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
56 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
57 #define TIPC_MAX_PORT 0xffffffff
58 #define TIPC_MIN_PORT 1
59 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
62 TIPC_LISTEN = TCP_LISTEN,
63 TIPC_ESTABLISHED = TCP_ESTABLISHED,
64 TIPC_OPEN = TCP_CLOSE,
65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
66 TIPC_CONNECTING = TCP_SYN_SENT,
69 struct sockaddr_pair {
70 struct sockaddr_tipc sock;
71 struct sockaddr_tipc member;
75 * struct tipc_sock - TIPC socket structure
76 * @sk: socket - interacts with 'port' and with user via the socket API
77 * @max_pkt: maximum packet size "hint" used when building messages sent by port
78 * @maxnagle: maximum size of msg which can be subject to nagle
79 * @portid: unique port identity in TIPC socket hash table
80 * @phdr: preformatted message header used when sending messages
81 * @cong_links: list of congested links
82 * @publications: list of publications for port
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 void tipc_sk_timeout(struct timer_list *t);
150 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
151 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
152 static int tipc_sk_leave(struct tipc_sock *tsk);
153 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
154 static int tipc_sk_insert(struct tipc_sock *tsk);
155 static void tipc_sk_remove(struct tipc_sock *tsk);
156 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
157 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
158 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
159 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
161 static const struct proto_ops packet_ops;
162 static const struct proto_ops stream_ops;
163 static const struct proto_ops msg_ops;
164 static struct proto tipc_proto;
165 static const struct rhashtable_params tsk_rht_params;
167 static u32 tsk_own_node(struct tipc_sock *tsk)
169 return msg_prevnode(&tsk->phdr);
172 static u32 tsk_peer_node(struct tipc_sock *tsk)
174 return msg_destnode(&tsk->phdr);
177 static u32 tsk_peer_port(struct tipc_sock *tsk)
179 return msg_destport(&tsk->phdr);
182 static bool tsk_unreliable(struct tipc_sock *tsk)
184 return msg_src_droppable(&tsk->phdr) != 0;
187 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
189 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
192 static bool tsk_unreturnable(struct tipc_sock *tsk)
194 return msg_dest_droppable(&tsk->phdr) != 0;
197 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
199 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
202 static int tsk_importance(struct tipc_sock *tsk)
204 return msg_importance(&tsk->phdr);
207 static struct tipc_sock *tipc_sk(const struct sock *sk)
209 return container_of(sk, struct tipc_sock, sk);
212 int tsk_set_importance(struct sock *sk, int imp)
214 if (imp > TIPC_CRITICAL_IMPORTANCE)
216 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
220 static bool tsk_conn_cong(struct tipc_sock *tsk)
222 return tsk->snt_unacked > tsk->snd_win;
225 static u16 tsk_blocks(int len)
227 return ((len / FLOWCTL_BLK_SZ) + 1);
230 /* tsk_blocks(): translate a buffer size in bytes to number of
231 * advertisable blocks, taking into account the ratio truesize(len)/len
232 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
234 static u16 tsk_adv_blocks(int len)
236 return len / FLOWCTL_BLK_SZ / 4;
239 /* tsk_inc(): increment counter for sent or received data
240 * - If block based flow control is not supported by peer we
241 * fall back to message based ditto, incrementing the counter
243 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
245 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
246 return ((msglen / FLOWCTL_BLK_SZ) + 1);
250 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
252 static void tsk_set_nagle(struct tipc_sock *tsk)
254 struct sock *sk = &tsk->sk;
257 if (sk->sk_type != SOCK_STREAM)
261 if (!(tsk->peer_caps & TIPC_NAGLE))
263 /* Limit node local buffer size to avoid receive queue overflow */
264 if (tsk->max_pkt == MAX_MSG_SIZE)
265 tsk->maxnagle = 1500;
267 tsk->maxnagle = tsk->max_pkt;
271 * tsk_advance_rx_queue - discard first buffer in socket receive queue
272 * @sk: network socket
274 * Caller must hold socket lock
276 static void tsk_advance_rx_queue(struct sock *sk)
278 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
279 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
282 /* tipc_sk_respond() : send response message back to sender
284 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
288 u32 onode = tipc_own_addr(sock_net(sk));
290 if (!tipc_msg_reverse(onode, &skb, err))
293 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
294 dnode = msg_destnode(buf_msg(skb));
295 selector = msg_origport(buf_msg(skb));
296 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
300 * tsk_rej_rx_queue - reject all buffers in socket receive queue
301 * @sk: network socket
302 * @error: response error code
304 * Caller must hold socket lock
306 static void tsk_rej_rx_queue(struct sock *sk, int error)
310 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
311 tipc_sk_respond(sk, skb, error);
314 static bool tipc_sk_connected(const struct sock *sk)
316 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
319 /* tipc_sk_type_connectionless - check if the socket is datagram socket
322 * Returns true if connection less, false otherwise
324 static bool tipc_sk_type_connectionless(struct sock *sk)
326 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
329 /* tsk_peer_msg - verify if message was sent by connected port's peer
331 * Handles cases where the node's network address has changed from
332 * the default of <0.0.0> to its configured setting.
334 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
336 struct sock *sk = &tsk->sk;
337 u32 self = tipc_own_addr(sock_net(sk));
338 u32 peer_port = tsk_peer_port(tsk);
339 u32 orig_node, peer_node;
341 if (unlikely(!tipc_sk_connected(sk)))
344 if (unlikely(msg_origport(msg) != peer_port))
347 orig_node = msg_orignode(msg);
348 peer_node = tsk_peer_node(tsk);
350 if (likely(orig_node == peer_node))
353 if (!orig_node && peer_node == self)
356 if (!peer_node && orig_node == self)
362 /* tipc_set_sk_state - set the sk_state of the socket
365 * Caller must hold socket lock
367 * Returns 0 on success, errno otherwise
369 static int tipc_set_sk_state(struct sock *sk, int state)
371 int oldsk_state = sk->sk_state;
379 case TIPC_CONNECTING:
380 if (oldsk_state == TIPC_OPEN)
383 case TIPC_ESTABLISHED:
384 if (oldsk_state == TIPC_CONNECTING ||
385 oldsk_state == TIPC_OPEN)
388 case TIPC_DISCONNECTING:
389 if (oldsk_state == TIPC_CONNECTING ||
390 oldsk_state == TIPC_ESTABLISHED)
396 sk->sk_state = state;
401 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
403 struct sock *sk = sock->sk;
404 int err = sock_error(sk);
405 int typ = sock->type;
409 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
410 if (sk->sk_state == TIPC_DISCONNECTING)
412 else if (!tipc_sk_connected(sk))
417 if (signal_pending(current))
418 return sock_intr_errno(*timeout);
423 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
425 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
429 while ((rc_ = !(condition_))) { \
430 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
433 rc_ = tipc_sk_sock_err((sock_), timeo_); \
436 add_wait_queue(sk_sleep(sk_), &wait_); \
438 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
439 sched_annotate_sleep(); \
441 remove_wait_queue(sk_sleep(sk_), &wait_); \
447 * tipc_sk_create - create a TIPC socket
448 * @net: network namespace (must be default network)
449 * @sock: pre-allocated socket structure
450 * @protocol: protocol indicator (must be 0)
451 * @kern: caused by kernel or by userspace?
453 * This routine creates additional data structures used by the TIPC socket,
454 * initializes them, and links them together.
456 * Return: 0 on success, errno otherwise
458 static int tipc_sk_create(struct net *net, struct socket *sock,
459 int protocol, int kern)
461 const struct proto_ops *ops;
463 struct tipc_sock *tsk;
464 struct tipc_msg *msg;
466 /* Validate arguments */
467 if (unlikely(protocol != 0))
468 return -EPROTONOSUPPORT;
470 switch (sock->type) {
485 /* Allocate socket's protocol area */
486 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
491 tsk->max_pkt = MAX_PKT_DEFAULT;
493 tsk->nagle_start = NAGLE_START_INIT;
494 INIT_LIST_HEAD(&tsk->publications);
495 INIT_LIST_HEAD(&tsk->cong_links);
498 /* Finish initializing socket data structures */
500 sock_init_data(sock, sk);
501 tipc_set_sk_state(sk, TIPC_OPEN);
502 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 = READ_ONCE(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 disassociate 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;
1017 ua->sa.type = msg_nametype(hdr);
1018 ua->scope = msg_lookup_scope(hdr);
1020 while (++lookups < 4) {
1021 exclude = tipc_group_exclude(tsk->group);
1025 /* Look for a non-congested destination member, if any */
1027 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1029 return -EHOSTUNREACH;
1030 tipc_dest_pop(&dsts, &node, &port);
1031 cong = tipc_group_cong(tsk->group, node, port, blks,
1041 /* Start over if destination was not in member list */
1045 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1048 /* Block or return if destination link or member is congested */
1049 rc = tipc_wait_for_cond(sock, &timeout,
1050 !tipc_dest_find(cong_links, node, 0) &&
1052 !tipc_group_cong(tsk->group, node, port,
1057 /* Send, unless destination disappeared while waiting */
1062 if (unlikely(lookups >= 4))
1063 return -EHOSTUNREACH;
1065 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1067 return rc ? rc : dlen;
1071 * tipc_send_group_bcast - send message to all members in communication group
1072 * @sock: socket structure
1073 * @m: message to send
1074 * @dlen: total length of message data
1075 * @timeout: timeout to wait for wakeup
1077 * Called from function tipc_sendmsg(), which has done all sanity checks
1078 * Return: the number of bytes sent on success, or errno
1080 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1081 int dlen, long timeout)
1083 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1084 struct sock *sk = sock->sk;
1085 struct net *net = sock_net(sk);
1086 struct tipc_sock *tsk = tipc_sk(sk);
1087 struct tipc_nlist *dsts;
1088 struct tipc_mc_method *method = &tsk->mc_method;
1089 bool ack = method->mandatory && method->rcast;
1090 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1091 struct tipc_msg *hdr = &tsk->phdr;
1092 int mtu = tipc_bcast_get_mtu(net);
1093 struct sk_buff_head pkts;
1094 int rc = -EHOSTUNREACH;
1096 /* Block or return if any destination link or member is congested */
1097 rc = tipc_wait_for_cond(sock, &timeout,
1098 !tsk->cong_link_cnt && tsk->group &&
1099 !tipc_group_bc_cong(tsk->group, blks));
1103 dsts = tipc_group_dests(tsk->group);
1104 if (!dsts->local && !dsts->remote)
1105 return -EHOSTUNREACH;
1107 /* Complete message header */
1109 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1110 msg_set_nameinst(hdr, ua->sa.instance);
1112 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1113 msg_set_nameinst(hdr, 0);
1115 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1116 msg_set_destport(hdr, 0);
1117 msg_set_destnode(hdr, 0);
1118 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1120 /* Avoid getting stuck with repeated forced replicasts */
1121 msg_set_grp_bc_ack_req(hdr, ack);
1123 /* Build message as chain of buffers */
1124 __skb_queue_head_init(&pkts);
1125 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1126 if (unlikely(rc != dlen))
1130 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1134 /* Update broadcast sequence number and send windows */
1135 tipc_group_update_bc_members(tsk->group, blks, ack);
1137 /* Broadcast link is now free to choose method for next broadcast */
1138 method->mandatory = false;
1139 method->expires = jiffies;
1145 * tipc_send_group_mcast - send message to all members with given identity
1146 * @sock: socket structure
1147 * @m: message to send
1148 * @dlen: total length of message data
1149 * @timeout: timeout to wait for wakeup
1151 * Called from function tipc_sendmsg(), which has done all sanity checks
1152 * Return: the number of bytes sent on success, or errno
1154 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1155 int dlen, long timeout)
1157 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1158 struct sock *sk = sock->sk;
1159 struct tipc_sock *tsk = tipc_sk(sk);
1160 struct tipc_group *grp = tsk->group;
1161 struct tipc_msg *hdr = &tsk->phdr;
1162 struct net *net = sock_net(sk);
1163 u32 dstcnt, exclude;
1166 ua->sa.type = msg_nametype(hdr);
1167 ua->scope = msg_lookup_scope(hdr);
1168 exclude = tipc_group_exclude(grp);
1170 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1171 return -EHOSTUNREACH;
1174 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1175 return tipc_send_group_unicast(sock, m, dlen, timeout);
1178 tipc_dest_list_purge(&dsts);
1179 return tipc_send_group_bcast(sock, m, dlen, timeout);
1183 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1184 * @net: the associated network namespace
1185 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1186 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1188 * Multi-threaded: parallel calls with reference to same queues may occur
1190 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1191 struct sk_buff_head *inputq)
1193 u32 self = tipc_own_addr(net);
1194 struct sk_buff *skb, *_skb;
1196 struct sk_buff_head tmpq;
1197 struct list_head dports;
1198 struct tipc_msg *hdr;
1199 struct tipc_uaddr ua;
1200 int user, mtyp, hlen;
1202 __skb_queue_head_init(&tmpq);
1203 INIT_LIST_HEAD(&dports);
1204 ua.addrtype = TIPC_SERVICE_RANGE;
1206 /* tipc_skb_peek() increments the head skb's reference counter */
1207 skb = tipc_skb_peek(arrvq, &inputq->lock);
1208 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1210 user = msg_user(hdr);
1211 mtyp = msg_type(hdr);
1212 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1213 onode = msg_orignode(hdr);
1214 ua.sr.type = msg_nametype(hdr);
1215 ua.sr.lower = msg_namelower(hdr);
1216 ua.sr.upper = msg_nameupper(hdr);
1218 ua.scope = TIPC_ANY_SCOPE;
1220 ua.scope = TIPC_CLUSTER_SCOPE;
1222 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1223 spin_lock_bh(&inputq->lock);
1224 if (skb_peek(arrvq) == skb) {
1225 __skb_dequeue(arrvq);
1226 __skb_queue_tail(inputq, skb);
1229 spin_unlock_bh(&inputq->lock);
1233 /* Group messages require exact scope match */
1234 if (msg_in_group(hdr)) {
1237 ua.scope = msg_lookup_scope(hdr);
1240 /* Create destination port list: */
1241 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1243 /* Clone message per destination */
1244 while (tipc_dest_pop(&dports, NULL, &portid)) {
1245 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1247 msg_set_destport(buf_msg(_skb), portid);
1248 __skb_queue_tail(&tmpq, _skb);
1251 pr_warn("Failed to clone mcast rcv buffer\n");
1253 /* Append clones to inputq only if skb is still head of arrvq */
1254 spin_lock_bh(&inputq->lock);
1255 if (skb_peek(arrvq) == skb) {
1256 skb_queue_splice_tail_init(&tmpq, inputq);
1257 /* Decrement the skb's refcnt */
1258 kfree_skb(__skb_dequeue(arrvq));
1260 spin_unlock_bh(&inputq->lock);
1261 __skb_queue_purge(&tmpq);
1264 tipc_sk_rcv(net, inputq);
1267 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1268 * when socket is in Nagle mode
1270 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1272 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1273 struct sk_buff *skb = skb_peek_tail(txq);
1274 struct net *net = sock_net(&tsk->sk);
1275 u32 dnode = tsk_peer_node(tsk);
1279 tsk->pkt_cnt += skb_queue_len(txq);
1280 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1282 if (tsk->nagle_start < NAGLE_START_MAX)
1283 tsk->nagle_start *= 2;
1284 tsk->expect_ack = false;
1285 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1286 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1289 tsk->nagle_start = NAGLE_START_INIT;
1291 msg_set_ack_required(buf_msg(skb));
1292 tsk->expect_ack = true;
1294 tsk->expect_ack = false;
1301 if (!skb || tsk->cong_link_cnt)
1304 /* Do not send SYN again after congestion */
1305 if (msg_is_syn(buf_msg(skb)))
1309 tsk->pkt_cnt += skb_queue_len(txq);
1310 tsk->snt_unacked += tsk->snd_backlog;
1311 tsk->snd_backlog = 0;
1312 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1313 if (rc == -ELINKCONG)
1314 tsk->cong_link_cnt = 1;
1318 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1319 * @tsk: receiving socket
1320 * @skb: pointer to message buffer.
1321 * @inputq: buffer list containing the buffers
1322 * @xmitq: output message area
1324 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1325 struct sk_buff_head *inputq,
1326 struct sk_buff_head *xmitq)
1328 struct tipc_msg *hdr = buf_msg(skb);
1329 u32 onode = tsk_own_node(tsk);
1330 struct sock *sk = &tsk->sk;
1331 int mtyp = msg_type(hdr);
1334 /* Ignore if connection cannot be validated: */
1335 if (!tsk_peer_msg(tsk, hdr)) {
1336 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1340 if (unlikely(msg_errcode(hdr))) {
1341 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1342 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1343 tsk_peer_port(tsk));
1344 sk->sk_state_change(sk);
1346 /* State change is ignored if socket already awake,
1347 * - convert msg to abort msg and add to inqueue
1349 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1350 msg_set_type(hdr, TIPC_CONN_MSG);
1351 msg_set_size(hdr, BASIC_H_SIZE);
1352 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1353 __skb_queue_tail(inputq, skb);
1357 tsk->probe_unacked = false;
1359 if (mtyp == CONN_PROBE) {
1360 msg_set_type(hdr, CONN_PROBE_REPLY);
1361 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1362 __skb_queue_tail(xmitq, skb);
1364 } else if (mtyp == CONN_ACK) {
1365 was_cong = tsk_conn_cong(tsk);
1366 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1367 tsk->snt_unacked -= msg_conn_ack(hdr);
1368 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1369 tsk->snd_win = msg_adv_win(hdr);
1370 if (was_cong && !tsk_conn_cong(tsk))
1371 sk->sk_write_space(sk);
1372 } else if (mtyp != CONN_PROBE_REPLY) {
1373 pr_warn("Received unknown CONN_PROTO msg\n");
1380 * tipc_sendmsg - send message in connectionless manner
1381 * @sock: socket structure
1382 * @m: message to send
1383 * @dsz: amount of user data to be sent
1385 * Message must have an destination specified explicitly.
1386 * Used for SOCK_RDM and SOCK_DGRAM messages,
1387 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1388 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1390 * Return: the number of bytes sent on success, or errno otherwise
1392 static int tipc_sendmsg(struct socket *sock,
1393 struct msghdr *m, size_t dsz)
1395 struct sock *sk = sock->sk;
1399 ret = __tipc_sendmsg(sock, m, dsz);
1405 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1407 struct sock *sk = sock->sk;
1408 struct net *net = sock_net(sk);
1409 struct tipc_sock *tsk = tipc_sk(sk);
1410 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1411 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1412 struct list_head *clinks = &tsk->cong_links;
1413 bool syn = !tipc_sk_type_connectionless(sk);
1414 struct tipc_group *grp = tsk->group;
1415 struct tipc_msg *hdr = &tsk->phdr;
1416 struct tipc_socket_addr skaddr;
1417 struct sk_buff_head pkts;
1420 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1424 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1426 atype = ua->addrtype;
1429 /* If socket belongs to a communication group follow other paths */
1432 return tipc_send_group_bcast(sock, m, dlen, timeout);
1433 if (atype == TIPC_SERVICE_ADDR)
1434 return tipc_send_group_anycast(sock, m, dlen, timeout);
1435 if (atype == TIPC_SOCKET_ADDR)
1436 return tipc_send_group_unicast(sock, m, dlen, timeout);
1437 if (atype == TIPC_SERVICE_RANGE)
1438 return tipc_send_group_mcast(sock, m, dlen, timeout);
1443 ua = (struct tipc_uaddr *)&tsk->peer;
1444 if (!syn && ua->family != AF_TIPC)
1445 return -EDESTADDRREQ;
1446 atype = ua->addrtype;
1449 if (unlikely(syn)) {
1450 if (sk->sk_state == TIPC_LISTEN)
1452 if (sk->sk_state != TIPC_OPEN)
1456 if (atype == TIPC_SERVICE_ADDR)
1457 tsk->conn_addrtype = atype;
1458 msg_set_syn(hdr, 1);
1461 memset(&skaddr, 0, sizeof(skaddr));
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);
1520 if (dlen && timeout) {
1521 timeout = msecs_to_jiffies(timeout);
1522 tipc_wait_for_connect(sock, &timeout);
1526 return rc ? rc : dlen;
1530 * tipc_sendstream - send stream-oriented data
1531 * @sock: socket structure
1533 * @dsz: total length of data to be transmitted
1535 * Used for SOCK_STREAM data.
1537 * Return: the number of bytes sent on success (or partial success),
1538 * or errno if no data sent
1540 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1542 struct sock *sk = sock->sk;
1546 ret = __tipc_sendstream(sock, m, dsz);
1552 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1554 struct sock *sk = sock->sk;
1555 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1556 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1557 struct sk_buff_head *txq = &sk->sk_write_queue;
1558 struct tipc_sock *tsk = tipc_sk(sk);
1559 struct tipc_msg *hdr = &tsk->phdr;
1560 struct net *net = sock_net(sk);
1561 struct sk_buff *skb;
1562 u32 dnode = tsk_peer_node(tsk);
1563 int maxnagle = tsk->maxnagle;
1564 int maxpkt = tsk->max_pkt;
1568 if (unlikely(dlen > INT_MAX))
1571 /* Handle implicit connection setup */
1572 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1573 rc = __tipc_sendmsg(sock, m, dlen);
1574 if (dlen && dlen == rc) {
1575 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1576 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1582 rc = tipc_wait_for_cond(sock, &timeout,
1583 (!tsk->cong_link_cnt &&
1584 !tsk_conn_cong(tsk) &&
1585 tipc_sk_connected(sk)));
1588 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1589 blocks = tsk->snd_backlog;
1590 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1592 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1593 if (unlikely(rc < 0))
1597 if (blocks <= 64 && tsk->expect_ack) {
1598 tsk->snd_backlog = blocks;
1601 } else if (blocks > 64) {
1602 tsk->pkt_cnt += skb_queue_len(txq);
1604 skb = skb_peek_tail(txq);
1606 msg_set_ack_required(buf_msg(skb));
1607 tsk->expect_ack = true;
1609 tsk->expect_ack = false;
1615 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1616 if (unlikely(rc != send))
1618 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1620 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1621 TIPC_DUMP_SK_SNDQ, " ");
1622 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1623 if (unlikely(rc == -ELINKCONG)) {
1624 tsk->cong_link_cnt = 1;
1628 tsk->snt_unacked += blocks;
1629 tsk->snd_backlog = 0;
1632 } while (sent < dlen && !rc);
1634 return sent ? sent : rc;
1638 * tipc_send_packet - send a connection-oriented message
1639 * @sock: socket structure
1640 * @m: message to send
1641 * @dsz: length of data to be transmitted
1643 * Used for SOCK_SEQPACKET messages.
1645 * Return: the number of bytes sent on success, or errno otherwise
1647 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1649 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1652 return tipc_sendstream(sock, m, dsz);
1655 /* tipc_sk_finish_conn - complete the setup of a connection
1657 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1660 struct sock *sk = &tsk->sk;
1661 struct net *net = sock_net(sk);
1662 struct tipc_msg *msg = &tsk->phdr;
1664 msg_set_syn(msg, 0);
1665 msg_set_destnode(msg, peer_node);
1666 msg_set_destport(msg, peer_port);
1667 msg_set_type(msg, TIPC_CONN_MSG);
1668 msg_set_lookup_scope(msg, 0);
1669 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1671 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1672 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1673 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1674 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1675 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1677 __skb_queue_purge(&sk->sk_write_queue);
1678 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1681 /* Fall back to message based flow control */
1682 tsk->rcv_win = FLOWCTL_MSG_WIN;
1683 tsk->snd_win = FLOWCTL_MSG_WIN;
1687 * tipc_sk_set_orig_addr - capture sender's address for received message
1688 * @m: descriptor for message info
1689 * @skb: received message
1691 * Note: Address is not captured if not requested by receiver.
1693 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1695 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1696 struct tipc_msg *hdr = buf_msg(skb);
1701 srcaddr->sock.family = AF_TIPC;
1702 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1703 srcaddr->sock.scope = 0;
1704 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1705 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1706 srcaddr->sock.addr.name.domain = 0;
1707 m->msg_namelen = sizeof(struct sockaddr_tipc);
1709 if (!msg_in_group(hdr))
1712 /* Group message users may also want to know sending member's id */
1713 srcaddr->member.family = AF_TIPC;
1714 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1715 srcaddr->member.scope = 0;
1716 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1717 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1718 srcaddr->member.addr.name.domain = 0;
1719 m->msg_namelen = sizeof(*srcaddr);
1723 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1724 * @m: descriptor for message info
1725 * @skb: received message buffer
1726 * @tsk: TIPC port associated with message
1728 * Note: Ancillary data is not captured if not requested by receiver.
1730 * Return: 0 if successful, otherwise errno
1732 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1733 struct tipc_sock *tsk)
1735 struct tipc_msg *hdr;
1740 if (likely(m->msg_controllen == 0))
1744 dlen = msg_data_sz(hdr);
1746 /* Capture errored message object, if any */
1747 if (msg_errcode(hdr)) {
1748 if (skb_linearize(skb))
1751 data[0] = msg_errcode(hdr);
1753 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1756 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1761 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1762 switch (msg_type(hdr)) {
1763 case TIPC_NAMED_MSG:
1765 data[0] = msg_nametype(hdr);
1766 data[1] = msg_namelower(hdr);
1769 case TIPC_MCAST_MSG:
1771 data[0] = msg_nametype(hdr);
1772 data[1] = msg_namelower(hdr);
1773 data[2] = msg_nameupper(hdr);
1776 has_addr = !!tsk->conn_addrtype;
1777 data[0] = msg_nametype(&tsk->phdr);
1778 data[1] = msg_nameinst(&tsk->phdr);
1786 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1789 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1791 struct sock *sk = &tsk->sk;
1792 struct sk_buff *skb = NULL;
1793 struct tipc_msg *msg;
1794 u32 peer_port = tsk_peer_port(tsk);
1795 u32 dnode = tsk_peer_node(tsk);
1797 if (!tipc_sk_connected(sk))
1799 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1800 dnode, tsk_own_node(tsk), peer_port,
1801 tsk->portid, TIPC_OK);
1805 msg_set_conn_ack(msg, tsk->rcv_unacked);
1806 tsk->rcv_unacked = 0;
1808 /* Adjust to and advertize the correct window limit */
1809 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1810 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1811 msg_set_adv_win(msg, tsk->rcv_win);
1816 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1818 struct sk_buff *skb;
1820 skb = tipc_sk_build_ack(tsk);
1824 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1825 msg_link_selector(buf_msg(skb)));
1828 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1830 struct sock *sk = sock->sk;
1831 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1832 long timeo = *timeop;
1833 int err = sock_error(sk);
1839 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1840 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1844 add_wait_queue(sk_sleep(sk), &wait);
1846 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1847 sched_annotate_sleep();
1849 remove_wait_queue(sk_sleep(sk), &wait);
1852 if (!skb_queue_empty(&sk->sk_receive_queue))
1857 err = sock_intr_errno(timeo);
1858 if (signal_pending(current))
1861 err = sock_error(sk);
1870 * tipc_recvmsg - receive packet-oriented message
1871 * @sock: network socket
1872 * @m: descriptor for message info
1873 * @buflen: length of user buffer area
1874 * @flags: receive flags
1876 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1877 * If the complete message doesn't fit in user area, truncate it.
1879 * Return: size of returned message data, errno otherwise
1881 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1882 size_t buflen, int flags)
1884 struct sock *sk = sock->sk;
1885 bool connected = !tipc_sk_type_connectionless(sk);
1886 struct tipc_sock *tsk = tipc_sk(sk);
1887 int rc, err, hlen, dlen, copy;
1888 struct tipc_skb_cb *skb_cb;
1889 struct sk_buff_head xmitq;
1890 struct tipc_msg *hdr;
1891 struct sk_buff *skb;
1895 /* Catch invalid receive requests */
1896 if (unlikely(!buflen))
1900 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1904 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1906 /* Step rcv queue to first msg with data or error; wait if necessary */
1908 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1911 skb = skb_peek(&sk->sk_receive_queue);
1912 skb_cb = TIPC_SKB_CB(skb);
1914 dlen = msg_data_sz(hdr);
1915 hlen = msg_hdr_sz(hdr);
1916 err = msg_errcode(hdr);
1917 grp_evt = msg_is_grp_evt(hdr);
1918 if (likely(dlen || err))
1920 tsk_advance_rx_queue(sk);
1923 /* Collect msg meta data, including error code and rejected data */
1924 tipc_sk_set_orig_addr(m, skb);
1925 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1930 /* Capture data if non-error msg, otherwise just set return value */
1932 int offset = skb_cb->bytes_read;
1934 copy = min_t(int, dlen - offset, buflen);
1935 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1938 if (unlikely(offset + copy < dlen)) {
1939 if (flags & MSG_EOR) {
1940 if (!(flags & MSG_PEEK))
1941 skb_cb->bytes_read = offset + copy;
1943 m->msg_flags |= MSG_TRUNC;
1944 skb_cb->bytes_read = 0;
1947 if (flags & MSG_EOR)
1948 m->msg_flags |= MSG_EOR;
1949 skb_cb->bytes_read = 0;
1954 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1960 /* Mark message as group event if applicable */
1961 if (unlikely(grp_evt)) {
1962 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1963 m->msg_flags |= MSG_EOR;
1964 m->msg_flags |= MSG_OOB;
1968 /* Caption of data or error code/rejected data was successful */
1969 if (unlikely(flags & MSG_PEEK))
1972 /* Send group flow control advertisement when applicable */
1973 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1974 __skb_queue_head_init(&xmitq);
1975 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1976 msg_orignode(hdr), msg_origport(hdr),
1978 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1981 if (skb_cb->bytes_read)
1984 tsk_advance_rx_queue(sk);
1986 if (likely(!connected))
1989 /* Send connection flow control advertisement when applicable */
1990 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1991 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1992 tipc_sk_send_ack(tsk);
1995 return rc ? rc : copy;
1999 * tipc_recvstream - receive stream-oriented data
2000 * @sock: network socket
2001 * @m: descriptor for message info
2002 * @buflen: total size of user buffer area
2003 * @flags: receive flags
2005 * Used for SOCK_STREAM messages only. If not enough data is available
2006 * will optionally wait for more; never truncates data.
2008 * Return: size of returned message data, errno otherwise
2010 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2011 size_t buflen, int flags)
2013 struct sock *sk = sock->sk;
2014 struct tipc_sock *tsk = tipc_sk(sk);
2015 struct sk_buff *skb;
2016 struct tipc_msg *hdr;
2017 struct tipc_skb_cb *skb_cb;
2018 bool peek = flags & MSG_PEEK;
2019 int offset, required, copy, copied = 0;
2020 int hlen, dlen, err, rc;
2023 /* Catch invalid receive attempts */
2024 if (unlikely(!buflen))
2029 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2033 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2034 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2037 /* Look at first msg in receive queue; wait if necessary */
2038 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2041 skb = skb_peek(&sk->sk_receive_queue);
2042 skb_cb = TIPC_SKB_CB(skb);
2044 dlen = msg_data_sz(hdr);
2045 hlen = msg_hdr_sz(hdr);
2046 err = msg_errcode(hdr);
2048 /* Discard any empty non-errored (SYN-) message */
2049 if (unlikely(!dlen && !err)) {
2050 tsk_advance_rx_queue(sk);
2054 /* Collect msg meta data, incl. error code and rejected data */
2056 tipc_sk_set_orig_addr(m, skb);
2057 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2063 /* Copy data if msg ok, otherwise return error/partial data */
2065 offset = skb_cb->bytes_read;
2066 copy = min_t(int, dlen - offset, buflen - copied);
2067 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2072 if (unlikely(offset < dlen)) {
2074 skb_cb->bytes_read = offset;
2079 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2088 tsk_advance_rx_queue(sk);
2090 /* Send connection flow control advertisement when applicable */
2091 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2092 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2093 tipc_sk_send_ack(tsk);
2095 /* Exit if all requested data or FIN/error received */
2096 if (copied == buflen || err)
2099 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2102 return copied ? copied : rc;
2106 * tipc_write_space - wake up thread if port congestion is released
2109 static void tipc_write_space(struct sock *sk)
2111 struct socket_wq *wq;
2114 wq = rcu_dereference(sk->sk_wq);
2115 if (skwq_has_sleeper(wq))
2116 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2117 EPOLLWRNORM | EPOLLWRBAND);
2122 * tipc_data_ready - wake up threads to indicate messages have been received
2125 static void tipc_data_ready(struct sock *sk)
2127 struct socket_wq *wq;
2129 trace_sk_data_ready(sk);
2132 wq = rcu_dereference(sk->sk_wq);
2133 if (skwq_has_sleeper(wq))
2134 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2135 EPOLLRDNORM | EPOLLRDBAND);
2139 static void tipc_sock_destruct(struct sock *sk)
2141 __skb_queue_purge(&sk->sk_receive_queue);
2144 static void tipc_sk_proto_rcv(struct sock *sk,
2145 struct sk_buff_head *inputq,
2146 struct sk_buff_head *xmitq)
2148 struct sk_buff *skb = __skb_dequeue(inputq);
2149 struct tipc_sock *tsk = tipc_sk(sk);
2150 struct tipc_msg *hdr = buf_msg(skb);
2151 struct tipc_group *grp = tsk->group;
2152 bool wakeup = false;
2154 switch (msg_user(hdr)) {
2156 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2159 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2160 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2162 tsk->cong_link_cnt--;
2164 tipc_sk_push_backlog(tsk, false);
2166 case GROUP_PROTOCOL:
2167 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2170 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2171 hdr, inputq, xmitq);
2178 sk->sk_write_space(sk);
2184 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2186 * @skb: pointer to message buffer.
2187 * @xmitq: for Nagle ACK if any
2188 * Return: true if message should be added to receive queue, false otherwise
2190 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2191 struct sk_buff_head *xmitq)
2193 struct sock *sk = &tsk->sk;
2194 struct net *net = sock_net(sk);
2195 struct tipc_msg *hdr = buf_msg(skb);
2196 bool con_msg = msg_connected(hdr);
2197 u32 pport = tsk_peer_port(tsk);
2198 u32 pnode = tsk_peer_node(tsk);
2199 u32 oport = msg_origport(hdr);
2200 u32 onode = msg_orignode(hdr);
2201 int err = msg_errcode(hdr);
2202 unsigned long delay;
2204 if (unlikely(msg_mcast(hdr)))
2208 switch (sk->sk_state) {
2209 case TIPC_CONNECTING:
2211 if (likely(con_msg)) {
2214 tipc_sk_finish_conn(tsk, oport, onode);
2215 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2216 /* ACK+ message with data is added to receive queue */
2217 if (msg_data_sz(hdr))
2219 /* Empty ACK-, - wake up sleeping connect() and drop */
2220 sk->sk_state_change(sk);
2221 msg_set_dest_droppable(hdr, 1);
2224 /* Ignore connectionless message if not from listening socket */
2225 if (oport != pport || onode != pnode)
2229 if (err != TIPC_ERR_OVERLOAD)
2232 /* Prepare for new setup attempt if we have a SYN clone */
2233 if (skb_queue_empty(&sk->sk_write_queue))
2235 get_random_bytes(&delay, 2);
2236 delay %= (tsk->conn_timeout / 4);
2237 delay = msecs_to_jiffies(delay + 100);
2238 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2241 case TIPC_DISCONNECTING:
2244 /* Accept only SYN message */
2245 if (!msg_is_syn(hdr) &&
2246 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2248 if (!con_msg && !err)
2251 case TIPC_ESTABLISHED:
2252 if (!skb_queue_empty(&sk->sk_write_queue))
2253 tipc_sk_push_backlog(tsk, false);
2254 /* Accept only connection-based messages sent by peer */
2255 if (likely(con_msg && !err && pport == oport &&
2257 if (msg_ack_required(hdr)) {
2258 struct sk_buff *skb;
2260 skb = tipc_sk_build_ack(tsk);
2262 msg_set_nagle_ack(buf_msg(skb));
2263 __skb_queue_tail(xmitq, skb);
2268 if (!tsk_peer_msg(tsk, hdr))
2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2273 tipc_node_remove_conn(net, pnode, tsk->portid);
2274 sk->sk_state_change(sk);
2277 pr_err("Unknown sk_state %u\n", sk->sk_state);
2279 /* Abort connection setup attempt */
2280 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2281 sk->sk_err = ECONNREFUSED;
2282 sk->sk_state_change(sk);
2287 * rcvbuf_limit - get proper overload limit of socket receive queue
2291 * For connection oriented messages, irrespective of importance,
2292 * default queue limit is 2 MB.
2294 * For connectionless messages, queue limits are based on message
2295 * importance as follows:
2297 * TIPC_LOW_IMPORTANCE (2 MB)
2298 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2299 * TIPC_HIGH_IMPORTANCE (8 MB)
2300 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2302 * Return: overload limit according to corresponding message importance
2304 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2306 struct tipc_sock *tsk = tipc_sk(sk);
2307 struct tipc_msg *hdr = buf_msg(skb);
2309 if (unlikely(msg_in_group(hdr)))
2310 return READ_ONCE(sk->sk_rcvbuf);
2312 if (unlikely(!msg_connected(hdr)))
2313 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2315 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2316 return READ_ONCE(sk->sk_rcvbuf);
2318 return FLOWCTL_MSG_LIM;
2322 * tipc_sk_filter_rcv - validate incoming message
2324 * @skb: pointer to message.
2325 * @xmitq: output message area (FIXME)
2327 * Enqueues message on receive queue if acceptable; optionally handles
2328 * disconnect indication for a connected socket.
2330 * Called with socket lock already taken
2332 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2333 struct sk_buff_head *xmitq)
2335 bool sk_conn = !tipc_sk_type_connectionless(sk);
2336 struct tipc_sock *tsk = tipc_sk(sk);
2337 struct tipc_group *grp = tsk->group;
2338 struct tipc_msg *hdr = buf_msg(skb);
2339 struct net *net = sock_net(sk);
2340 struct sk_buff_head inputq;
2341 int mtyp = msg_type(hdr);
2342 int limit, err = TIPC_OK;
2344 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2345 TIPC_SKB_CB(skb)->bytes_read = 0;
2346 __skb_queue_head_init(&inputq);
2347 __skb_queue_tail(&inputq, skb);
2349 if (unlikely(!msg_isdata(hdr)))
2350 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2353 tipc_group_filter_msg(grp, &inputq, xmitq);
2355 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2356 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2358 /* Validate and add to receive buffer if there is space */
2359 while ((skb = __skb_dequeue(&inputq))) {
2361 limit = rcvbuf_limit(sk, skb);
2362 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2363 (!sk_conn && msg_connected(hdr)) ||
2364 (!grp && msg_in_group(hdr)))
2365 err = TIPC_ERR_NO_PORT;
2366 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2367 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2369 atomic_inc(&sk->sk_drops);
2370 err = TIPC_ERR_OVERLOAD;
2373 if (unlikely(err)) {
2374 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2375 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2377 __skb_queue_tail(xmitq, skb);
2382 __skb_queue_tail(&sk->sk_receive_queue, skb);
2383 skb_set_owner_r(skb, sk);
2384 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2385 "rcvq >90% allocated!");
2386 sk->sk_data_ready(sk);
2391 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2395 * Caller must hold socket lock
2397 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2399 unsigned int before = sk_rmem_alloc_get(sk);
2400 struct sk_buff_head xmitq;
2403 __skb_queue_head_init(&xmitq);
2405 tipc_sk_filter_rcv(sk, skb, &xmitq);
2406 added = sk_rmem_alloc_get(sk) - before;
2407 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2409 /* Send pending response/rejected messages, if any */
2410 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2415 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2416 * inputq and try adding them to socket or backlog queue
2417 * @inputq: list of incoming buffers with potentially different destinations
2418 * @sk: socket where the buffers should be enqueued
2419 * @dport: port number for the socket
2420 * @xmitq: output queue
2422 * Caller must hold socket lock
2424 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2425 u32 dport, struct sk_buff_head *xmitq)
2427 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2428 struct sk_buff *skb;
2433 while (skb_queue_len(inputq)) {
2434 if (unlikely(time_after_eq(jiffies, time_limit)))
2437 skb = tipc_skb_dequeue(inputq, dport);
2441 /* Add message directly to receive queue if possible */
2442 if (!sock_owned_by_user(sk)) {
2443 tipc_sk_filter_rcv(sk, skb, xmitq);
2447 /* Try backlog, compensating for double-counted bytes */
2448 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2449 if (!sk->sk_backlog.len)
2450 atomic_set(dcnt, 0);
2451 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2452 if (likely(!sk_add_backlog(sk, skb, lim))) {
2453 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2454 "bklg & rcvq >90% allocated!");
2458 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2459 /* Overload => reject message back to sender */
2460 onode = tipc_own_addr(sock_net(sk));
2461 atomic_inc(&sk->sk_drops);
2462 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2463 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2465 __skb_queue_tail(xmitq, skb);
2472 * tipc_sk_rcv - handle a chain of incoming buffers
2473 * @net: the associated network namespace
2474 * @inputq: buffer list containing the buffers
2475 * Consumes all buffers in list until inputq is empty
2476 * Note: may be called in multiple threads referring to the same queue
2478 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2480 struct sk_buff_head xmitq;
2481 u32 dnode, dport = 0;
2483 struct tipc_sock *tsk;
2485 struct sk_buff *skb;
2487 __skb_queue_head_init(&xmitq);
2488 while (skb_queue_len(inputq)) {
2489 dport = tipc_skb_peek_port(inputq, dport);
2490 tsk = tipc_sk_lookup(net, dport);
2494 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2495 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2496 spin_unlock_bh(&sk->sk_lock.slock);
2498 /* Send pending response/rejected messages, if any */
2499 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2503 /* No destination socket => dequeue skb if still there */
2504 skb = tipc_skb_dequeue(inputq, dport);
2508 /* Try secondary lookup if unresolved named message */
2509 err = TIPC_ERR_NO_PORT;
2510 if (tipc_msg_lookup_dest(net, skb, &err))
2513 /* Prepare for message rejection */
2514 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2517 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2519 dnode = msg_destnode(buf_msg(skb));
2520 tipc_node_xmit_skb(net, skb, dnode, dport);
2524 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2526 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2527 struct sock *sk = sock->sk;
2531 int err = sock_error(sk);
2536 if (signal_pending(current))
2537 return sock_intr_errno(*timeo_p);
2538 if (sk->sk_state == TIPC_DISCONNECTING)
2541 add_wait_queue(sk_sleep(sk), &wait);
2542 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2544 remove_wait_queue(sk_sleep(sk), &wait);
2549 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2551 if (addr->family != AF_TIPC)
2553 if (addr->addrtype == TIPC_SERVICE_RANGE)
2554 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2555 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2556 addr->addrtype == TIPC_SOCKET_ADDR);
2560 * tipc_connect - establish a connection to another TIPC port
2561 * @sock: socket structure
2562 * @dest: socket address for destination port
2563 * @destlen: size of socket address data structure
2564 * @flags: file-related flags associated with socket
2566 * Return: 0 on success, errno otherwise
2568 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2569 int destlen, int flags)
2571 struct sock *sk = sock->sk;
2572 struct tipc_sock *tsk = tipc_sk(sk);
2573 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2574 struct msghdr m = {NULL,};
2575 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2579 if (destlen != sizeof(struct sockaddr_tipc))
2589 if (dst->family == AF_UNSPEC) {
2590 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2591 if (!tipc_sk_type_connectionless(sk))
2595 if (!tipc_sockaddr_is_sane(dst)) {
2599 /* DGRAM/RDM connect(), just save the destaddr */
2600 if (tipc_sk_type_connectionless(sk)) {
2601 memcpy(&tsk->peer, dest, destlen);
2603 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2608 previous = sk->sk_state;
2610 switch (sk->sk_state) {
2612 /* Send a 'SYN-' to destination */
2614 m.msg_namelen = destlen;
2615 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2617 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2618 * indicate send_msg() is never blocked.
2621 m.msg_flags = MSG_DONTWAIT;
2623 res = __tipc_sendmsg(sock, &m, 0);
2624 if ((res < 0) && (res != -EWOULDBLOCK))
2627 /* Just entered TIPC_CONNECTING state; the only
2628 * difference is that return value in non-blocking
2629 * case is EINPROGRESS, rather than EALREADY.
2633 case TIPC_CONNECTING:
2635 if (previous == TIPC_CONNECTING)
2639 timeout = msecs_to_jiffies(timeout);
2640 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2641 res = tipc_wait_for_connect(sock, &timeout);
2643 case TIPC_ESTABLISHED:
2656 * tipc_listen - allow socket to listen for incoming connections
2657 * @sock: socket structure
2660 * Return: 0 on success, errno otherwise
2662 static int tipc_listen(struct socket *sock, int len)
2664 struct sock *sk = sock->sk;
2668 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2674 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2676 struct sock *sk = sock->sk;
2677 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2680 /* True wake-one mechanism for incoming connections: only
2681 * one process gets woken up, not the 'whole herd'.
2682 * Since we do not 'race & poll' for established sockets
2683 * anymore, the common case will execute the loop only once.
2686 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2687 add_wait_queue(sk_sleep(sk), &wait);
2689 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2691 remove_wait_queue(sk_sleep(sk), &wait);
2694 if (!skb_queue_empty(&sk->sk_receive_queue))
2699 err = sock_intr_errno(timeo);
2700 if (signal_pending(current))
2707 * tipc_accept - wait for connection request
2708 * @sock: listening socket
2709 * @new_sock: new socket that is to be connected
2710 * @arg: arguments for accept
2712 * Return: 0 on success, errno otherwise
2714 static int tipc_accept(struct socket *sock, struct socket *new_sock,
2715 struct proto_accept_arg *arg)
2717 struct sock *new_sk, *sk = sock->sk;
2718 struct tipc_sock *new_tsock;
2719 struct msghdr m = {NULL,};
2720 struct tipc_msg *msg;
2721 struct sk_buff *buf;
2727 if (sk->sk_state != TIPC_LISTEN) {
2731 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
2732 res = tipc_wait_for_accept(sock, timeo);
2736 buf = skb_peek(&sk->sk_receive_queue);
2738 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, arg->kern);
2741 security_sk_clone(sock->sk, new_sock->sk);
2743 new_sk = new_sock->sk;
2744 new_tsock = tipc_sk(new_sk);
2747 /* we lock on new_sk; but lockdep sees the lock on sk */
2748 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2751 * Reject any stray messages received by new socket
2752 * before the socket lock was taken (very, very unlikely)
2754 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2756 /* Connect new socket to it's peer */
2757 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2759 tsk_set_importance(new_sk, msg_importance(msg));
2760 if (msg_named(msg)) {
2761 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2762 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2763 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2767 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2768 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2770 if (!msg_data_sz(msg)) {
2771 tsk_advance_rx_queue(sk);
2773 __skb_dequeue(&sk->sk_receive_queue);
2774 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2775 skb_set_owner_r(buf, new_sk);
2777 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2778 __tipc_sendstream(new_sock, &m, 0);
2779 release_sock(new_sk);
2786 * tipc_shutdown - shutdown socket connection
2787 * @sock: socket structure
2788 * @how: direction to close (must be SHUT_RDWR)
2790 * Terminates connection (if necessary), then purges socket's receive queue.
2792 * Return: 0 on success, errno otherwise
2794 static int tipc_shutdown(struct socket *sock, int how)
2796 struct sock *sk = sock->sk;
2799 if (how != SHUT_RDWR)
2804 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2805 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2806 sk->sk_shutdown = SHUTDOWN_MASK;
2808 if (sk->sk_state == TIPC_DISCONNECTING) {
2809 /* Discard any unreceived messages */
2810 __skb_queue_purge(&sk->sk_receive_queue);
2816 /* Wake up anyone sleeping in poll. */
2817 sk->sk_state_change(sk);
2823 static void tipc_sk_check_probing_state(struct sock *sk,
2824 struct sk_buff_head *list)
2826 struct tipc_sock *tsk = tipc_sk(sk);
2827 u32 pnode = tsk_peer_node(tsk);
2828 u32 pport = tsk_peer_port(tsk);
2829 u32 self = tsk_own_node(tsk);
2830 u32 oport = tsk->portid;
2831 struct sk_buff *skb;
2833 if (tsk->probe_unacked) {
2834 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2835 sk->sk_err = ECONNABORTED;
2836 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2837 sk->sk_state_change(sk);
2840 /* Prepare new probe */
2841 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2842 pnode, self, pport, oport, TIPC_OK);
2844 __skb_queue_tail(list, skb);
2845 tsk->probe_unacked = true;
2846 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2849 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2851 struct tipc_sock *tsk = tipc_sk(sk);
2853 /* Try again later if dest link is congested */
2854 if (tsk->cong_link_cnt) {
2855 sk_reset_timer(sk, &sk->sk_timer,
2856 jiffies + msecs_to_jiffies(100));
2859 /* Prepare SYN for retransmit */
2860 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2863 static void tipc_sk_timeout(struct timer_list *t)
2865 struct sock *sk = from_timer(sk, t, sk_timer);
2866 struct tipc_sock *tsk = tipc_sk(sk);
2867 u32 pnode = tsk_peer_node(tsk);
2868 struct sk_buff_head list;
2871 __skb_queue_head_init(&list);
2874 /* Try again later if socket is busy */
2875 if (sock_owned_by_user(sk)) {
2876 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2882 if (sk->sk_state == TIPC_ESTABLISHED)
2883 tipc_sk_check_probing_state(sk, &list);
2884 else if (sk->sk_state == TIPC_CONNECTING)
2885 tipc_sk_retry_connect(sk, &list);
2889 if (!skb_queue_empty(&list))
2890 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2892 /* SYN messages may cause link congestion */
2893 if (rc == -ELINKCONG) {
2894 tipc_dest_push(&tsk->cong_links, pnode, 0);
2895 tsk->cong_link_cnt = 1;
2900 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2902 struct sock *sk = &tsk->sk;
2903 struct net *net = sock_net(sk);
2904 struct tipc_socket_addr skaddr;
2905 struct publication *p;
2908 if (tipc_sk_connected(sk))
2910 key = tsk->portid + tsk->pub_count + 1;
2911 if (key == tsk->portid)
2913 skaddr.ref = tsk->portid;
2914 skaddr.node = tipc_own_addr(net);
2915 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2919 list_add(&p->binding_sock, &tsk->publications);
2921 tsk->published = true;
2925 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2927 struct net *net = sock_net(&tsk->sk);
2928 struct publication *safe, *p;
2929 struct tipc_uaddr _ua;
2932 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2934 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2935 p->sr.type, p->sr.lower, p->sr.upper);
2936 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2939 /* Unbind specific publication */
2940 if (p->scope != ua->scope)
2942 if (p->sr.type != ua->sr.type)
2944 if (p->sr.lower != ua->sr.lower)
2946 if (p->sr.upper != ua->sr.upper)
2948 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2952 if (list_empty(&tsk->publications)) {
2959 /* tipc_sk_reinit: set non-zero address in all existing sockets
2960 * when we go from standalone to network mode.
2962 void tipc_sk_reinit(struct net *net)
2964 struct tipc_net *tn = net_generic(net, tipc_net_id);
2965 struct rhashtable_iter iter;
2966 struct tipc_sock *tsk;
2967 struct tipc_msg *msg;
2969 rhashtable_walk_enter(&tn->sk_rht, &iter);
2972 rhashtable_walk_start(&iter);
2974 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2975 sock_hold(&tsk->sk);
2976 rhashtable_walk_stop(&iter);
2977 lock_sock(&tsk->sk);
2979 msg_set_prevnode(msg, tipc_own_addr(net));
2980 msg_set_orignode(msg, tipc_own_addr(net));
2981 release_sock(&tsk->sk);
2982 rhashtable_walk_start(&iter);
2986 rhashtable_walk_stop(&iter);
2987 } while (tsk == ERR_PTR(-EAGAIN));
2989 rhashtable_walk_exit(&iter);
2992 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2994 struct tipc_net *tn = net_generic(net, tipc_net_id);
2995 struct tipc_sock *tsk;
2998 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
3000 sock_hold(&tsk->sk);
3006 static int tipc_sk_insert(struct tipc_sock *tsk)
3008 struct sock *sk = &tsk->sk;
3009 struct net *net = sock_net(sk);
3010 struct tipc_net *tn = net_generic(net, tipc_net_id);
3011 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3012 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3014 while (remaining--) {
3016 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3017 portid = TIPC_MIN_PORT;
3018 tsk->portid = portid;
3019 sock_hold(&tsk->sk);
3020 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3029 static void tipc_sk_remove(struct tipc_sock *tsk)
3031 struct sock *sk = &tsk->sk;
3032 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3034 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3035 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3040 static const struct rhashtable_params tsk_rht_params = {
3042 .head_offset = offsetof(struct tipc_sock, node),
3043 .key_offset = offsetof(struct tipc_sock, portid),
3044 .key_len = sizeof(u32), /* portid */
3045 .max_size = 1048576,
3047 .automatic_shrinking = true,
3050 int tipc_sk_rht_init(struct net *net)
3052 struct tipc_net *tn = net_generic(net, tipc_net_id);
3054 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3057 void tipc_sk_rht_destroy(struct net *net)
3059 struct tipc_net *tn = net_generic(net, tipc_net_id);
3061 /* Wait for socket readers to complete */
3064 rhashtable_destroy(&tn->sk_rht);
3067 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3069 struct net *net = sock_net(&tsk->sk);
3070 struct tipc_group *grp = tsk->group;
3071 struct tipc_msg *hdr = &tsk->phdr;
3072 struct tipc_uaddr ua;
3075 if (mreq->type < TIPC_RESERVED_TYPES)
3077 if (mreq->scope > TIPC_NODE_SCOPE)
3079 if (mreq->scope != TIPC_NODE_SCOPE)
3080 mreq->scope = TIPC_CLUSTER_SCOPE;
3083 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3087 msg_set_lookup_scope(hdr, mreq->scope);
3088 msg_set_nametype(hdr, mreq->type);
3089 msg_set_dest_droppable(hdr, true);
3090 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3091 mreq->type, mreq->instance, mreq->instance);
3092 tipc_nametbl_build_group(net, grp, &ua);
3093 rc = tipc_sk_publish(tsk, &ua);
3095 tipc_group_delete(net, grp);
3099 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3100 tsk->mc_method.rcast = true;
3101 tsk->mc_method.mandatory = true;
3102 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3106 static int tipc_sk_leave(struct tipc_sock *tsk)
3108 struct net *net = sock_net(&tsk->sk);
3109 struct tipc_group *grp = tsk->group;
3110 struct tipc_uaddr ua;
3115 ua.addrtype = TIPC_SERVICE_RANGE;
3116 tipc_group_self(grp, &ua.sr, &scope);
3118 tipc_group_delete(net, grp);
3120 tipc_sk_withdraw(tsk, &ua);
3125 * tipc_setsockopt - set socket option
3126 * @sock: socket structure
3127 * @lvl: option level
3128 * @opt: option identifier
3129 * @ov: pointer to new option value
3130 * @ol: length of option value
3132 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3133 * (to ease compatibility).
3135 * Return: 0 on success, errno otherwise
3137 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3138 sockptr_t ov, unsigned int ol)
3140 struct sock *sk = sock->sk;
3141 struct tipc_sock *tsk = tipc_sk(sk);
3142 struct tipc_group_req mreq;
3146 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3148 if (lvl != SOL_TIPC)
3149 return -ENOPROTOOPT;
3152 case TIPC_IMPORTANCE:
3153 case TIPC_SRC_DROPPABLE:
3154 case TIPC_DEST_DROPPABLE:
3155 case TIPC_CONN_TIMEOUT:
3157 if (ol < sizeof(value))
3159 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3162 case TIPC_GROUP_JOIN:
3163 if (ol < sizeof(mreq))
3165 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3169 if (!sockptr_is_null(ov) || ol)
3176 case TIPC_IMPORTANCE:
3177 res = tsk_set_importance(sk, value);
3179 case TIPC_SRC_DROPPABLE:
3180 if (sock->type != SOCK_STREAM)
3181 tsk_set_unreliable(tsk, value);
3185 case TIPC_DEST_DROPPABLE:
3186 tsk_set_unreturnable(tsk, value);
3188 case TIPC_CONN_TIMEOUT:
3189 tipc_sk(sk)->conn_timeout = value;
3191 case TIPC_MCAST_BROADCAST:
3192 tsk->mc_method.rcast = false;
3193 tsk->mc_method.mandatory = true;
3195 case TIPC_MCAST_REPLICAST:
3196 tsk->mc_method.rcast = true;
3197 tsk->mc_method.mandatory = true;
3199 case TIPC_GROUP_JOIN:
3200 res = tipc_sk_join(tsk, &mreq);
3202 case TIPC_GROUP_LEAVE:
3203 res = tipc_sk_leave(tsk);
3206 tsk->nodelay = !!value;
3219 * tipc_getsockopt - get socket option
3220 * @sock: socket structure
3221 * @lvl: option level
3222 * @opt: option identifier
3223 * @ov: receptacle for option value
3224 * @ol: receptacle for length of option value
3226 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3227 * (to ease compatibility).
3229 * Return: 0 on success, errno otherwise
3231 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3232 char __user *ov, int __user *ol)
3234 struct sock *sk = sock->sk;
3235 struct tipc_sock *tsk = tipc_sk(sk);
3236 struct tipc_service_range seq;
3241 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3242 return put_user(0, ol);
3243 if (lvl != SOL_TIPC)
3244 return -ENOPROTOOPT;
3245 res = get_user(len, ol);
3252 case TIPC_IMPORTANCE:
3253 value = tsk_importance(tsk);
3255 case TIPC_SRC_DROPPABLE:
3256 value = tsk_unreliable(tsk);
3258 case TIPC_DEST_DROPPABLE:
3259 value = tsk_unreturnable(tsk);
3261 case TIPC_CONN_TIMEOUT:
3262 value = tsk->conn_timeout;
3263 /* no need to set "res", since already 0 at this point */
3265 case TIPC_NODE_RECVQ_DEPTH:
3266 value = 0; /* was tipc_queue_size, now obsolete */
3268 case TIPC_SOCK_RECVQ_DEPTH:
3269 value = skb_queue_len(&sk->sk_receive_queue);
3271 case TIPC_SOCK_RECVQ_USED:
3272 value = sk_rmem_alloc_get(sk);
3274 case TIPC_GROUP_JOIN:
3277 tipc_group_self(tsk->group, &seq, &scope);
3287 return res; /* "get" failed */
3289 if (len < sizeof(value))
3292 if (copy_to_user(ov, &value, sizeof(value)))
3295 return put_user(sizeof(value), ol);
3298 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3300 struct net *net = sock_net(sock->sk);
3301 struct tipc_sioc_nodeid_req nr = {0};
3302 struct tipc_sioc_ln_req lnr;
3303 void __user *argp = (void __user *)arg;
3306 case SIOCGETLINKNAME:
3307 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3309 if (!tipc_node_get_linkname(net,
3310 lnr.bearer_id & 0xffff, lnr.peer,
3311 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3312 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3316 return -EADDRNOTAVAIL;
3318 if (copy_from_user(&nr, argp, sizeof(nr)))
3320 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3321 return -EADDRNOTAVAIL;
3322 if (copy_to_user(argp, &nr, sizeof(nr)))
3326 return -ENOIOCTLCMD;
3330 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3332 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3333 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3334 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3336 tsk1->peer.family = AF_TIPC;
3337 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3338 tsk1->peer.scope = TIPC_NODE_SCOPE;
3339 tsk1->peer.addr.id.ref = tsk2->portid;
3340 tsk1->peer.addr.id.node = onode;
3341 tsk2->peer.family = AF_TIPC;
3342 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3343 tsk2->peer.scope = TIPC_NODE_SCOPE;
3344 tsk2->peer.addr.id.ref = tsk1->portid;
3345 tsk2->peer.addr.id.node = onode;
3347 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3348 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3352 /* Protocol switches for the various types of TIPC sockets */
3354 static const struct proto_ops msg_ops = {
3355 .owner = THIS_MODULE,
3357 .release = tipc_release,
3359 .connect = tipc_connect,
3360 .socketpair = tipc_socketpair,
3361 .accept = sock_no_accept,
3362 .getname = tipc_getname,
3364 .ioctl = tipc_ioctl,
3365 .listen = sock_no_listen,
3366 .shutdown = tipc_shutdown,
3367 .setsockopt = tipc_setsockopt,
3368 .getsockopt = tipc_getsockopt,
3369 .sendmsg = tipc_sendmsg,
3370 .recvmsg = tipc_recvmsg,
3371 .mmap = sock_no_mmap,
3374 static const struct proto_ops packet_ops = {
3375 .owner = THIS_MODULE,
3377 .release = tipc_release,
3379 .connect = tipc_connect,
3380 .socketpair = tipc_socketpair,
3381 .accept = tipc_accept,
3382 .getname = tipc_getname,
3384 .ioctl = tipc_ioctl,
3385 .listen = tipc_listen,
3386 .shutdown = tipc_shutdown,
3387 .setsockopt = tipc_setsockopt,
3388 .getsockopt = tipc_getsockopt,
3389 .sendmsg = tipc_send_packet,
3390 .recvmsg = tipc_recvmsg,
3391 .mmap = sock_no_mmap,
3394 static const struct proto_ops stream_ops = {
3395 .owner = THIS_MODULE,
3397 .release = tipc_release,
3399 .connect = tipc_connect,
3400 .socketpair = tipc_socketpair,
3401 .accept = tipc_accept,
3402 .getname = tipc_getname,
3404 .ioctl = tipc_ioctl,
3405 .listen = tipc_listen,
3406 .shutdown = tipc_shutdown,
3407 .setsockopt = tipc_setsockopt,
3408 .getsockopt = tipc_getsockopt,
3409 .sendmsg = tipc_sendstream,
3410 .recvmsg = tipc_recvstream,
3411 .mmap = sock_no_mmap,
3414 static const struct net_proto_family tipc_family_ops = {
3415 .owner = THIS_MODULE,
3417 .create = tipc_sk_create
3420 static struct proto tipc_proto = {
3422 .owner = THIS_MODULE,
3423 .obj_size = sizeof(struct tipc_sock),
3424 .sysctl_rmem = sysctl_tipc_rmem
3428 * tipc_socket_init - initialize TIPC socket interface
3430 * Return: 0 on success, errno otherwise
3432 int tipc_socket_init(void)
3436 res = proto_register(&tipc_proto, 1);
3438 pr_err("Failed to register TIPC protocol type\n");
3442 res = sock_register(&tipc_family_ops);
3444 pr_err("Failed to register TIPC socket type\n");
3445 proto_unregister(&tipc_proto);
3453 * tipc_socket_stop - stop TIPC socket interface
3455 void tipc_socket_stop(void)
3457 sock_unregister(tipc_family_ops.family);
3458 proto_unregister(&tipc_proto);
3461 /* Caller should hold socket lock for the passed tipc socket. */
3462 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3464 u32 peer_node, peer_port;
3465 u32 conn_type, conn_instance;
3466 struct nlattr *nest;
3468 peer_node = tsk_peer_node(tsk);
3469 peer_port = tsk_peer_port(tsk);
3470 conn_type = msg_nametype(&tsk->phdr);
3471 conn_instance = msg_nameinst(&tsk->phdr);
3472 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3476 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3478 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3481 if (tsk->conn_addrtype != 0) {
3482 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3484 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3486 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3489 nla_nest_end(skb, nest);
3494 nla_nest_cancel(skb, nest);
3499 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3502 struct net *net = sock_net(skb->sk);
3503 struct sock *sk = &tsk->sk;
3505 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3506 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3509 if (tipc_sk_connected(sk)) {
3510 if (__tipc_nl_add_sk_con(skb, tsk))
3512 } else if (!list_empty(&tsk->publications)) {
3513 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3519 /* Caller should hold socket lock for the passed tipc socket. */
3520 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3521 struct tipc_sock *tsk)
3523 struct nlattr *attrs;
3526 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3527 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3531 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3533 goto genlmsg_cancel;
3535 if (__tipc_nl_add_sk_info(skb, tsk))
3536 goto attr_msg_cancel;
3538 nla_nest_end(skb, attrs);
3539 genlmsg_end(skb, hdr);
3544 nla_nest_cancel(skb, attrs);
3546 genlmsg_cancel(skb, hdr);
3551 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3552 int (*skb_handler)(struct sk_buff *skb,
3553 struct netlink_callback *cb,
3554 struct tipc_sock *tsk))
3556 struct rhashtable_iter *iter = (void *)cb->args[4];
3557 struct tipc_sock *tsk;
3560 rhashtable_walk_start(iter);
3561 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3563 if (PTR_ERR(tsk) == -EAGAIN)
3568 sock_hold(&tsk->sk);
3569 rhashtable_walk_stop(iter);
3570 lock_sock(&tsk->sk);
3571 err = skb_handler(skb, cb, tsk);
3573 release_sock(&tsk->sk);
3577 release_sock(&tsk->sk);
3578 rhashtable_walk_start(iter);
3581 rhashtable_walk_stop(iter);
3585 EXPORT_SYMBOL(tipc_nl_sk_walk);
3587 int tipc_dump_start(struct netlink_callback *cb)
3589 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3591 EXPORT_SYMBOL(tipc_dump_start);
3593 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3595 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3596 struct rhashtable_iter *iter = (void *)cb->args[4];
3597 struct tipc_net *tn = tipc_net(net);
3600 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3604 cb->args[4] = (long)iter;
3607 rhashtable_walk_enter(&tn->sk_rht, iter);
3611 int tipc_dump_done(struct netlink_callback *cb)
3613 struct rhashtable_iter *hti = (void *)cb->args[4];
3615 rhashtable_walk_exit(hti);
3619 EXPORT_SYMBOL(tipc_dump_done);
3621 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3622 struct tipc_sock *tsk, u32 sk_filter_state,
3623 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3625 struct sock *sk = &tsk->sk;
3626 struct nlattr *attrs;
3627 struct nlattr *stat;
3629 /*filter response w.r.t sk_state*/
3630 if (!(sk_filter_state & (1 << sk->sk_state)))
3633 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3637 if (__tipc_nl_add_sk_info(skb, tsk))
3638 goto attr_msg_cancel;
3640 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3641 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3642 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3643 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3644 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3646 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3647 tipc_diag_gen_cookie(sk),
3649 goto attr_msg_cancel;
3651 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3653 goto attr_msg_cancel;
3655 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3656 skb_queue_len(&sk->sk_receive_queue)) ||
3657 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3658 skb_queue_len(&sk->sk_write_queue)) ||
3659 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3660 atomic_read(&sk->sk_drops)))
3661 goto stat_msg_cancel;
3663 if (tsk->cong_link_cnt &&
3664 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3665 goto stat_msg_cancel;
3667 if (tsk_conn_cong(tsk) &&
3668 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3669 goto stat_msg_cancel;
3671 nla_nest_end(skb, stat);
3674 if (tipc_group_fill_sock_diag(tsk->group, skb))
3675 goto stat_msg_cancel;
3677 nla_nest_end(skb, attrs);
3682 nla_nest_cancel(skb, stat);
3684 nla_nest_cancel(skb, attrs);
3688 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3690 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3692 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3695 /* Caller should hold socket lock for the passed tipc socket. */
3696 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3697 struct netlink_callback *cb,
3698 struct publication *publ)
3701 struct nlattr *attrs;
3703 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3704 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3708 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3710 goto genlmsg_cancel;
3712 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3713 goto attr_msg_cancel;
3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3715 goto attr_msg_cancel;
3716 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3717 goto attr_msg_cancel;
3718 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3719 goto attr_msg_cancel;
3721 nla_nest_end(skb, attrs);
3722 genlmsg_end(skb, hdr);
3727 nla_nest_cancel(skb, attrs);
3729 genlmsg_cancel(skb, hdr);
3734 /* Caller should hold socket lock for the passed tipc socket. */
3735 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3736 struct netlink_callback *cb,
3737 struct tipc_sock *tsk, u32 *last_publ)
3740 struct publication *p;
3743 list_for_each_entry(p, &tsk->publications, binding_sock) {
3744 if (p->key == *last_publ)
3747 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3748 /* We never set seq or call nl_dump_check_consistent()
3749 * this means that setting prev_seq here will cause the
3750 * consistence check to fail in the netlink callback
3751 * handler. Resulting in the last NLMSG_DONE message
3752 * having the NLM_F_DUMP_INTR flag set.
3759 p = list_first_entry(&tsk->publications, struct publication,
3763 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3764 err = __tipc_nl_add_sk_publ(skb, cb, p);
3766 *last_publ = p->key;
3775 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3778 u32 tsk_portid = cb->args[0];
3779 u32 last_publ = cb->args[1];
3780 u32 done = cb->args[2];
3781 struct net *net = sock_net(skb->sk);
3782 struct tipc_sock *tsk;
3785 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
3786 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3788 if (!attrs[TIPC_NLA_SOCK])
3791 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3792 attrs[TIPC_NLA_SOCK],
3793 tipc_nl_sock_policy, NULL);
3797 if (!sock[TIPC_NLA_SOCK_REF])
3800 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3806 tsk = tipc_sk_lookup(net, tsk_portid);
3810 lock_sock(&tsk->sk);
3811 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3814 release_sock(&tsk->sk);
3817 cb->args[0] = tsk_portid;
3818 cb->args[1] = last_publ;
3825 * tipc_sk_filtering - check if a socket should be traced
3826 * @sk: the socket to be examined
3828 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3829 * (portid, sock type, name type, name lower, name upper)
3831 * Return: true if the socket meets the socket tuple data
3832 * (value 0 = 'any') or when there is no tuple set (all = 0),
3835 bool tipc_sk_filtering(struct sock *sk)
3837 struct tipc_sock *tsk;
3838 struct publication *p;
3839 u32 _port, _sktype, _type, _lower, _upper;
3840 u32 type = 0, lower = 0, upper = 0;
3847 _port = sysctl_tipc_sk_filter[0];
3848 _sktype = sysctl_tipc_sk_filter[1];
3849 _type = sysctl_tipc_sk_filter[2];
3850 _lower = sysctl_tipc_sk_filter[3];
3851 _upper = sysctl_tipc_sk_filter[4];
3853 if (!_port && !_sktype && !_type && !_lower && !_upper)
3857 return (_port == tsk->portid);
3859 if (_sktype && _sktype != sk->sk_type)
3862 if (tsk->published) {
3863 p = list_first_entry_or_null(&tsk->publications,
3864 struct publication, binding_sock);
3867 lower = p->sr.lower;
3868 upper = p->sr.upper;
3872 if (!tipc_sk_type_connectionless(sk)) {
3873 type = msg_nametype(&tsk->phdr);
3874 lower = msg_nameinst(&tsk->phdr);
3878 if ((_type && _type != type) || (_lower && _lower != lower) ||
3879 (_upper && _upper != upper))
3885 u32 tipc_sock_get_portid(struct sock *sk)
3887 return (sk) ? (tipc_sk(sk))->portid : 0;
3891 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3892 * both the rcv and backlog queues are considered
3893 * @sk: tipc sk to be checked
3894 * @skb: tipc msg to be checked
3896 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3899 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3901 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3902 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3903 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3905 return (qsize > lim * 90 / 100);
3909 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3910 * only the rcv queue is considered
3911 * @sk: tipc sk to be checked
3912 * @skb: tipc msg to be checked
3914 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3917 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3919 unsigned int lim = rcvbuf_limit(sk, skb);
3920 unsigned int qsize = sk_rmem_alloc_get(sk);
3922 return (qsize > lim * 90 / 100);
3926 * tipc_sk_dump - dump TIPC socket
3927 * @sk: tipc sk to be dumped
3928 * @dqueues: bitmask to decide if any socket queue to be dumped?
3929 * - TIPC_DUMP_NONE: don't dump socket queues
3930 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3931 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3932 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3933 * - TIPC_DUMP_ALL: dump all the socket queues above
3934 * @buf: returned buffer of dump data in format
3936 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3939 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3940 u32 conn_type, conn_instance;
3941 struct tipc_sock *tsk;
3942 struct publication *p;
3946 i += scnprintf(buf, sz, "sk data: (null)\n");
3951 tsk_connected = !tipc_sk_type_connectionless(sk);
3953 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3954 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3955 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3956 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3957 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3958 if (tsk_connected) {
3959 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3960 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3961 conn_type = msg_nametype(&tsk->phdr);
3962 conn_instance = msg_nameinst(&tsk->phdr);
3963 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3964 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3966 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3967 if (tsk->published) {
3968 p = list_first_entry_or_null(&tsk->publications,
3969 struct publication, binding_sock);
3970 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3971 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3972 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3974 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3975 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3976 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3977 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3978 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3979 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3980 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3981 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3982 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3983 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3984 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3985 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3986 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3987 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3989 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3990 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3991 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3994 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3995 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3996 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3999 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4000 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4001 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4002 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4003 i += scnprintf(buf + i, sz - i, " tail ");
4004 i += tipc_skb_dump(sk->sk_backlog.tail, false,