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
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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
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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 * @blocking_link: address of the congested link we are currently sleeping on
84 * @pub_count: total # of publications port has made during its lifetime
85 * @conn_timeout: the time we can wait for an unresponded setup request
86 * @probe_unacked: probe has not received ack yet
87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
88 * @cong_link_cnt: number of congested links
89 * @snt_unacked: # messages sent by socket, and not yet acked by peer
90 * @snd_win: send window size
91 * @peer_caps: peer capabilities mask
92 * @rcv_unacked: # messages read by user, but not yet acked back to peer
93 * @rcv_win: receive window size
94 * @peer: 'connected' peer for dgram/rdm
95 * @node: hash table node
96 * @mc_method: cookie for use between socket and broadcast layer
97 * @rcu: rcu struct for tipc_sock
98 * @group: TIPC communications group
99 * @oneway: message count in one direction (FIXME)
100 * @nagle_start: current nagle value
101 * @snd_backlog: send backlog count
102 * @msg_acc: messages accepted; used in managing backlog and nagle
103 * @pkt_cnt: TIPC socket packet count
104 * @expect_ack: whether this TIPC socket is expecting an ack
105 * @nodelay: setsockopt() TIPC_NODELAY setting
106 * @group_is_open: TIPC socket group is fully open (FIXME)
107 * @published: true if port has one or more associated names
108 * @conn_addrtype: address type used when establishing connection
115 struct tipc_msg phdr;
116 struct list_head cong_links;
117 struct list_head publications;
119 atomic_t dupl_rcvcnt;
128 struct sockaddr_tipc peer;
129 struct rhash_head node;
130 struct tipc_mc_method mc_method;
132 struct tipc_group *group;
145 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
146 static void tipc_data_ready(struct sock *sk);
147 static void tipc_write_space(struct sock *sk);
148 static void tipc_sock_destruct(struct sock *sk);
149 static int tipc_release(struct socket *sock);
150 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
152 static void tipc_sk_timeout(struct timer_list *t);
153 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
155 static int tipc_sk_leave(struct tipc_sock *tsk);
156 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
157 static int tipc_sk_insert(struct tipc_sock *tsk);
158 static void tipc_sk_remove(struct tipc_sock *tsk);
159 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
160 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
161 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
162 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
164 static const struct proto_ops packet_ops;
165 static const struct proto_ops stream_ops;
166 static const struct proto_ops msg_ops;
167 static struct proto tipc_proto;
168 static const struct rhashtable_params tsk_rht_params;
170 static u32 tsk_own_node(struct tipc_sock *tsk)
172 return msg_prevnode(&tsk->phdr);
175 static u32 tsk_peer_node(struct tipc_sock *tsk)
177 return msg_destnode(&tsk->phdr);
180 static u32 tsk_peer_port(struct tipc_sock *tsk)
182 return msg_destport(&tsk->phdr);
185 static bool tsk_unreliable(struct tipc_sock *tsk)
187 return msg_src_droppable(&tsk->phdr) != 0;
190 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
192 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
195 static bool tsk_unreturnable(struct tipc_sock *tsk)
197 return msg_dest_droppable(&tsk->phdr) != 0;
200 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
202 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
205 static int tsk_importance(struct tipc_sock *tsk)
207 return msg_importance(&tsk->phdr);
210 static struct tipc_sock *tipc_sk(const struct sock *sk)
212 return container_of(sk, struct tipc_sock, sk);
215 int tsk_set_importance(struct sock *sk, int imp)
217 if (imp > TIPC_CRITICAL_IMPORTANCE)
219 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
223 static bool tsk_conn_cong(struct tipc_sock *tsk)
225 return tsk->snt_unacked > tsk->snd_win;
228 static u16 tsk_blocks(int len)
230 return ((len / FLOWCTL_BLK_SZ) + 1);
233 /* tsk_blocks(): translate a buffer size in bytes to number of
234 * advertisable blocks, taking into account the ratio truesize(len)/len
235 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
237 static u16 tsk_adv_blocks(int len)
239 return len / FLOWCTL_BLK_SZ / 4;
242 /* tsk_inc(): increment counter for sent or received data
243 * - If block based flow control is not supported by peer we
244 * fall back to message based ditto, incrementing the counter
246 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
248 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
249 return ((msglen / FLOWCTL_BLK_SZ) + 1);
253 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
255 static void tsk_set_nagle(struct tipc_sock *tsk)
257 struct sock *sk = &tsk->sk;
260 if (sk->sk_type != SOCK_STREAM)
264 if (!(tsk->peer_caps & TIPC_NAGLE))
266 /* Limit node local buffer size to avoid receive queue overflow */
267 if (tsk->max_pkt == MAX_MSG_SIZE)
268 tsk->maxnagle = 1500;
270 tsk->maxnagle = tsk->max_pkt;
274 * tsk_advance_rx_queue - discard first buffer in socket receive queue
275 * @sk: network socket
277 * Caller must hold socket lock
279 static void tsk_advance_rx_queue(struct sock *sk)
281 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
282 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
285 /* tipc_sk_respond() : send response message back to sender
287 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
291 u32 onode = tipc_own_addr(sock_net(sk));
293 if (!tipc_msg_reverse(onode, &skb, err))
296 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
297 dnode = msg_destnode(buf_msg(skb));
298 selector = msg_origport(buf_msg(skb));
299 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
303 * tsk_rej_rx_queue - reject all buffers in socket receive queue
304 * @sk: network socket
305 * @error: response error code
307 * Caller must hold socket lock
309 static void tsk_rej_rx_queue(struct sock *sk, int error)
313 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
314 tipc_sk_respond(sk, skb, error);
317 static bool tipc_sk_connected(const struct sock *sk)
319 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
322 /* tipc_sk_type_connectionless - check if the socket is datagram socket
325 * Returns true if connection less, false otherwise
327 static bool tipc_sk_type_connectionless(struct sock *sk)
329 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
332 /* tsk_peer_msg - verify if message was sent by connected port's peer
334 * Handles cases where the node's network address has changed from
335 * the default of <0.0.0> to its configured setting.
337 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
339 struct sock *sk = &tsk->sk;
340 u32 self = tipc_own_addr(sock_net(sk));
341 u32 peer_port = tsk_peer_port(tsk);
342 u32 orig_node, peer_node;
344 if (unlikely(!tipc_sk_connected(sk)))
347 if (unlikely(msg_origport(msg) != peer_port))
350 orig_node = msg_orignode(msg);
351 peer_node = tsk_peer_node(tsk);
353 if (likely(orig_node == peer_node))
356 if (!orig_node && peer_node == self)
359 if (!peer_node && orig_node == self)
365 /* tipc_set_sk_state - set the sk_state of the socket
368 * Caller must hold socket lock
370 * Returns 0 on success, errno otherwise
372 static int tipc_set_sk_state(struct sock *sk, int state)
374 int oldsk_state = sk->sk_state;
382 case TIPC_CONNECTING:
383 if (oldsk_state == TIPC_OPEN)
386 case TIPC_ESTABLISHED:
387 if (oldsk_state == TIPC_CONNECTING ||
388 oldsk_state == TIPC_OPEN)
391 case TIPC_DISCONNECTING:
392 if (oldsk_state == TIPC_CONNECTING ||
393 oldsk_state == TIPC_ESTABLISHED)
399 sk->sk_state = state;
404 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
406 struct sock *sk = sock->sk;
407 int err = sock_error(sk);
408 int typ = sock->type;
412 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
413 if (sk->sk_state == TIPC_DISCONNECTING)
415 else if (!tipc_sk_connected(sk))
420 if (signal_pending(current))
421 return sock_intr_errno(*timeout);
426 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
428 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
432 while ((rc_ = !(condition_))) { \
433 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
436 rc_ = tipc_sk_sock_err((sock_), timeo_); \
439 add_wait_queue(sk_sleep(sk_), &wait_); \
441 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
442 sched_annotate_sleep(); \
444 remove_wait_queue(sk_sleep(sk_), &wait_); \
450 * tipc_sk_create - create a TIPC socket
451 * @net: network namespace (must be default network)
452 * @sock: pre-allocated socket structure
453 * @protocol: protocol indicator (must be 0)
454 * @kern: caused by kernel or by userspace?
456 * This routine creates additional data structures used by the TIPC socket,
457 * initializes them, and links them together.
459 * Return: 0 on success, errno otherwise
461 static int tipc_sk_create(struct net *net, struct socket *sock,
462 int protocol, int kern)
464 const struct proto_ops *ops;
466 struct tipc_sock *tsk;
467 struct tipc_msg *msg;
469 /* Validate arguments */
470 if (unlikely(protocol != 0))
471 return -EPROTONOSUPPORT;
473 switch (sock->type) {
488 /* Allocate socket's protocol area */
489 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
494 tsk->max_pkt = MAX_PKT_DEFAULT;
496 tsk->nagle_start = NAGLE_START_INIT;
497 INIT_LIST_HEAD(&tsk->publications);
498 INIT_LIST_HEAD(&tsk->cong_links);
501 /* Finish initializing socket data structures */
503 sock_init_data(sock, sk);
504 tipc_set_sk_state(sk, TIPC_OPEN);
505 if (tipc_sk_insert(tsk)) {
507 pr_warn("Socket create failed; port number exhausted\n");
511 /* Ensure tsk is visible before we read own_addr. */
514 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
515 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
517 msg_set_origport(msg, tsk->portid);
518 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
520 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
521 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]);
522 sk->sk_data_ready = tipc_data_ready;
523 sk->sk_write_space = tipc_write_space;
524 sk->sk_destruct = tipc_sock_destruct;
525 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
526 tsk->group_is_open = true;
527 atomic_set(&tsk->dupl_rcvcnt, 0);
529 /* Start out with safe limits until we receive an advertised window */
530 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
531 tsk->rcv_win = tsk->snd_win;
533 if (tipc_sk_type_connectionless(sk)) {
534 tsk_set_unreturnable(tsk, true);
535 if (sock->type == SOCK_DGRAM)
536 tsk_set_unreliable(tsk, true);
538 __skb_queue_head_init(&tsk->mc_method.deferredq);
539 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
543 static void tipc_sk_callback(struct rcu_head *head)
545 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
550 /* Caller should hold socket lock for the socket. */
551 static void __tipc_shutdown(struct socket *sock, int error)
553 struct sock *sk = sock->sk;
554 struct tipc_sock *tsk = tipc_sk(sk);
555 struct net *net = sock_net(sk);
556 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
557 u32 dnode = tsk_peer_node(tsk);
560 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
561 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
562 !tsk_conn_cong(tsk)));
564 /* Push out delayed messages if in Nagle mode */
565 tipc_sk_push_backlog(tsk, false);
566 /* Remove pending SYN */
567 __skb_queue_purge(&sk->sk_write_queue);
569 /* Remove partially received buffer if any */
570 skb = skb_peek(&sk->sk_receive_queue);
571 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
572 __skb_unlink(skb, &sk->sk_receive_queue);
576 /* Reject all unreceived messages if connectionless */
577 if (tipc_sk_type_connectionless(sk)) {
578 tsk_rej_rx_queue(sk, error);
582 switch (sk->sk_state) {
583 case TIPC_CONNECTING:
584 case TIPC_ESTABLISHED:
585 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
586 tipc_node_remove_conn(net, dnode, tsk->portid);
587 /* Send a FIN+/- to its peer */
588 skb = __skb_dequeue(&sk->sk_receive_queue);
590 __skb_queue_purge(&sk->sk_receive_queue);
591 tipc_sk_respond(sk, skb, error);
594 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
595 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
596 tsk_own_node(tsk), tsk_peer_port(tsk),
599 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
602 /* Reject all SYN messages */
603 tsk_rej_rx_queue(sk, error);
606 __skb_queue_purge(&sk->sk_receive_queue);
612 * tipc_release - destroy a TIPC socket
613 * @sock: socket to destroy
615 * This routine cleans up any messages that are still queued on the socket.
616 * For DGRAM and RDM socket types, all queued messages are rejected.
617 * For SEQPACKET and STREAM socket types, the first message is rejected
618 * and any others are discarded. (If the first message on a STREAM socket
619 * is partially-read, it is discarded and the next one is rejected instead.)
621 * NOTE: Rejected messages are not necessarily returned to the sender! They
622 * are returned or discarded according to the "destination droppable" setting
623 * specified for the message by the sender.
625 * Return: 0 on success, errno otherwise
627 static int tipc_release(struct socket *sock)
629 struct sock *sk = sock->sk;
630 struct tipc_sock *tsk;
633 * Exit if socket isn't fully initialized (occurs when a failed accept()
634 * releases a pre-allocated child socket that was never used)
642 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
643 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
644 sk->sk_shutdown = SHUTDOWN_MASK;
646 tipc_sk_withdraw(tsk, NULL);
647 __skb_queue_purge(&tsk->mc_method.deferredq);
648 sk_stop_timer(sk, &sk->sk_timer);
652 /* Reject any messages that accumulated in backlog queue */
654 tipc_dest_list_purge(&tsk->cong_links);
655 tsk->cong_link_cnt = 0;
656 call_rcu(&tsk->rcu, tipc_sk_callback);
663 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
664 * @sock: socket structure
665 * @skaddr: socket address describing name(s) and desired operation
666 * @alen: size of socket address data structure
668 * Name and name sequence binding are indicated using a positive scope value;
669 * a negative scope value unbinds the specified name. Specifying no name
670 * (i.e. a socket address length of 0) unbinds all names from the socket.
672 * Return: 0 on success, errno otherwise
674 * NOTE: This routine doesn't need to take the socket lock since it doesn't
675 * access any non-constant socket information.
677 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
679 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
680 struct tipc_sock *tsk = tipc_sk(sock->sk);
684 return tipc_sk_withdraw(tsk, NULL);
686 if (ua->addrtype == TIPC_SERVICE_ADDR) {
687 ua->addrtype = TIPC_SERVICE_RANGE;
688 ua->sr.upper = ua->sr.lower;
692 ua->scope = -ua->scope;
694 /* Users may still use deprecated TIPC_ZONE_SCOPE */
695 if (ua->scope != TIPC_NODE_SCOPE)
696 ua->scope = TIPC_CLUSTER_SCOPE;
702 return tipc_sk_withdraw(tsk, ua);
703 return tipc_sk_publish(tsk, ua);
706 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
711 res = __tipc_bind(sock, skaddr, alen);
712 release_sock(sock->sk);
716 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
718 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
719 u32 atype = ua->addrtype;
722 if (!tipc_uaddr_valid(ua, alen))
724 if (atype == TIPC_SOCKET_ADDR)
725 return -EAFNOSUPPORT;
726 if (ua->sr.type < TIPC_RESERVED_TYPES) {
727 pr_warn_once("Can't bind to reserved service type %u\n",
732 return tipc_sk_bind(sock, skaddr, alen);
736 * tipc_getname - get port ID of socket or peer socket
737 * @sock: socket structure
738 * @uaddr: area for returned socket address
739 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
741 * Return: 0 on success, errno otherwise
743 * NOTE: This routine doesn't need to take the socket lock since it only
744 * accesses socket information that is unchanging (or which changes in
745 * a completely predictable manner).
747 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
750 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
751 struct sock *sk = sock->sk;
752 struct tipc_sock *tsk = tipc_sk(sk);
754 memset(addr, 0, sizeof(*addr));
756 if ((!tipc_sk_connected(sk)) &&
757 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
759 addr->addr.id.ref = tsk_peer_port(tsk);
760 addr->addr.id.node = tsk_peer_node(tsk);
762 addr->addr.id.ref = tsk->portid;
763 addr->addr.id.node = tipc_own_addr(sock_net(sk));
766 addr->addrtype = TIPC_SOCKET_ADDR;
767 addr->family = AF_TIPC;
769 addr->addr.name.domain = 0;
771 return sizeof(*addr);
775 * tipc_poll - read and possibly block on pollmask
776 * @file: file structure associated with the socket
777 * @sock: socket for which to calculate the poll bits
780 * Return: pollmask value
783 * It appears that the usual socket locking mechanisms are not useful here
784 * since the pollmask info is potentially out-of-date the moment this routine
785 * exits. TCP and other protocols seem to rely on higher level poll routines
786 * to handle any preventable race conditions, so TIPC will do the same ...
788 * IMPORTANT: The fact that a read or write operation is indicated does NOT
789 * imply that the operation will succeed, merely that it should be performed
790 * and will not block.
792 static __poll_t tipc_poll(struct file *file, struct socket *sock,
795 struct sock *sk = sock->sk;
796 struct tipc_sock *tsk = tipc_sk(sk);
797 __poll_t revents = 0;
799 sock_poll_wait(file, sock, wait);
800 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
802 if (sk->sk_shutdown & RCV_SHUTDOWN)
803 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
804 if (sk->sk_shutdown == SHUTDOWN_MASK)
807 switch (sk->sk_state) {
808 case TIPC_ESTABLISHED:
809 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
813 case TIPC_CONNECTING:
814 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
815 revents |= EPOLLIN | EPOLLRDNORM;
818 if (tsk->group_is_open && !tsk->cong_link_cnt)
820 if (!tipc_sk_type_connectionless(sk))
822 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
824 revents |= EPOLLIN | EPOLLRDNORM;
826 case TIPC_DISCONNECTING:
827 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
834 * tipc_sendmcast - send multicast message
835 * @sock: socket structure
836 * @ua: destination address struct
837 * @msg: message to send
838 * @dlen: length of data to send
839 * @timeout: timeout to wait for wakeup
841 * Called from function tipc_sendmsg(), which has done all sanity checks
842 * Return: the number of bytes sent on success, or errno
844 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
845 struct msghdr *msg, size_t dlen, long timeout)
847 struct sock *sk = sock->sk;
848 struct tipc_sock *tsk = tipc_sk(sk);
849 struct tipc_msg *hdr = &tsk->phdr;
850 struct net *net = sock_net(sk);
851 int mtu = tipc_bcast_get_mtu(net);
852 struct sk_buff_head pkts;
853 struct tipc_nlist dsts;
859 /* Block or return if any destination link is congested */
860 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
864 /* Lookup destination nodes */
865 tipc_nlist_init(&dsts, tipc_own_addr(net));
866 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
867 if (!dsts.local && !dsts.remote)
868 return -EHOSTUNREACH;
870 /* Build message header */
871 msg_set_type(hdr, TIPC_MCAST_MSG);
872 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
873 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
874 msg_set_destport(hdr, 0);
875 msg_set_destnode(hdr, 0);
876 msg_set_nametype(hdr, ua->sr.type);
877 msg_set_namelower(hdr, ua->sr.lower);
878 msg_set_nameupper(hdr, ua->sr.upper);
880 /* Build message as chain of buffers */
881 __skb_queue_head_init(&pkts);
882 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
884 /* Send message if build was successful */
885 if (unlikely(rc == dlen)) {
886 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
887 TIPC_DUMP_SK_SNDQ, " ");
888 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
889 &tsk->cong_link_cnt);
892 tipc_nlist_purge(&dsts);
894 return rc ? rc : dlen;
898 * tipc_send_group_msg - send a message to a member in the group
899 * @net: network namespace
901 * @m: message to send
903 * @dnode: destination node
904 * @dport: destination port
905 * @dlen: total length of message data
907 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
908 struct msghdr *m, struct tipc_member *mb,
909 u32 dnode, u32 dport, int dlen)
911 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
912 struct tipc_mc_method *method = &tsk->mc_method;
913 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
914 struct tipc_msg *hdr = &tsk->phdr;
915 struct sk_buff_head pkts;
918 /* Complete message header */
919 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
920 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
921 msg_set_destport(hdr, dport);
922 msg_set_destnode(hdr, dnode);
923 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
925 /* Build message as chain of buffers */
926 __skb_queue_head_init(&pkts);
927 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
928 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
929 if (unlikely(rc != dlen))
933 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
934 if (unlikely(rc == -ELINKCONG)) {
935 tipc_dest_push(&tsk->cong_links, dnode, 0);
936 tsk->cong_link_cnt++;
939 /* Update send window */
940 tipc_group_update_member(mb, blks);
942 /* A broadcast sent within next EXPIRE period must follow same path */
943 method->rcast = true;
944 method->mandatory = true;
949 * tipc_send_group_unicast - send message to a member in the group
950 * @sock: socket structure
951 * @m: message to send
952 * @dlen: total length of message data
953 * @timeout: timeout to wait for wakeup
955 * Called from function tipc_sendmsg(), which has done all sanity checks
956 * Return: the number of bytes sent on success, or errno
958 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
959 int dlen, long timeout)
961 struct sock *sk = sock->sk;
962 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
963 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
964 struct tipc_sock *tsk = tipc_sk(sk);
965 struct net *net = sock_net(sk);
966 struct tipc_member *mb = NULL;
973 return -EHOSTUNREACH;
975 /* Block or return if destination link or member is congested */
976 rc = tipc_wait_for_cond(sock, &timeout,
977 !tipc_dest_find(&tsk->cong_links, node, 0) &&
979 !tipc_group_cong(tsk->group, node, port, blks,
985 return -EHOSTUNREACH;
987 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
989 return rc ? rc : dlen;
993 * tipc_send_group_anycast - send message to any member with given identity
994 * @sock: socket structure
995 * @m: message to send
996 * @dlen: total length of message data
997 * @timeout: timeout to wait for wakeup
999 * Called from function tipc_sendmsg(), which has done all sanity checks
1000 * Return: the number of bytes sent on success, or errno
1002 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1003 int dlen, long timeout)
1005 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1006 struct sock *sk = sock->sk;
1007 struct tipc_sock *tsk = tipc_sk(sk);
1008 struct list_head *cong_links = &tsk->cong_links;
1009 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1010 struct tipc_msg *hdr = &tsk->phdr;
1011 struct tipc_member *first = NULL;
1012 struct tipc_member *mbr = NULL;
1013 struct net *net = sock_net(sk);
1014 u32 node, port, exclude;
1015 struct list_head dsts;
1020 INIT_LIST_HEAD(&dsts);
1021 ua->sa.type = msg_nametype(hdr);
1022 ua->scope = msg_lookup_scope(hdr);
1024 while (++lookups < 4) {
1025 exclude = tipc_group_exclude(tsk->group);
1029 /* Look for a non-congested destination member, if any */
1031 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1033 return -EHOSTUNREACH;
1034 tipc_dest_pop(&dsts, &node, &port);
1035 cong = tipc_group_cong(tsk->group, node, port, blks,
1045 /* Start over if destination was not in member list */
1049 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1052 /* Block or return if destination link or member is congested */
1053 rc = tipc_wait_for_cond(sock, &timeout,
1054 !tipc_dest_find(cong_links, node, 0) &&
1056 !tipc_group_cong(tsk->group, node, port,
1061 /* Send, unless destination disappeared while waiting */
1066 if (unlikely(lookups >= 4))
1067 return -EHOSTUNREACH;
1069 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1071 return rc ? rc : dlen;
1075 * tipc_send_group_bcast - send message to all members in communication group
1076 * @sock: socket structure
1077 * @m: message to send
1078 * @dlen: total length of message data
1079 * @timeout: timeout to wait for wakeup
1081 * Called from function tipc_sendmsg(), which has done all sanity checks
1082 * Return: the number of bytes sent on success, or errno
1084 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1085 int dlen, long timeout)
1087 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1088 struct sock *sk = sock->sk;
1089 struct net *net = sock_net(sk);
1090 struct tipc_sock *tsk = tipc_sk(sk);
1091 struct tipc_nlist *dsts;
1092 struct tipc_mc_method *method = &tsk->mc_method;
1093 bool ack = method->mandatory && method->rcast;
1094 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1095 struct tipc_msg *hdr = &tsk->phdr;
1096 int mtu = tipc_bcast_get_mtu(net);
1097 struct sk_buff_head pkts;
1098 int rc = -EHOSTUNREACH;
1100 /* Block or return if any destination link or member is congested */
1101 rc = tipc_wait_for_cond(sock, &timeout,
1102 !tsk->cong_link_cnt && tsk->group &&
1103 !tipc_group_bc_cong(tsk->group, blks));
1107 dsts = tipc_group_dests(tsk->group);
1108 if (!dsts->local && !dsts->remote)
1109 return -EHOSTUNREACH;
1111 /* Complete message header */
1113 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1114 msg_set_nameinst(hdr, ua->sa.instance);
1116 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1117 msg_set_nameinst(hdr, 0);
1119 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1120 msg_set_destport(hdr, 0);
1121 msg_set_destnode(hdr, 0);
1122 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1124 /* Avoid getting stuck with repeated forced replicasts */
1125 msg_set_grp_bc_ack_req(hdr, ack);
1127 /* Build message as chain of buffers */
1128 __skb_queue_head_init(&pkts);
1129 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1130 if (unlikely(rc != dlen))
1134 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1138 /* Update broadcast sequence number and send windows */
1139 tipc_group_update_bc_members(tsk->group, blks, ack);
1141 /* Broadcast link is now free to choose method for next broadcast */
1142 method->mandatory = false;
1143 method->expires = jiffies;
1149 * tipc_send_group_mcast - send message to all members with given identity
1150 * @sock: socket structure
1151 * @m: message to send
1152 * @dlen: total length of message data
1153 * @timeout: timeout to wait for wakeup
1155 * Called from function tipc_sendmsg(), which has done all sanity checks
1156 * Return: the number of bytes sent on success, or errno
1158 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1159 int dlen, long timeout)
1161 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1162 struct sock *sk = sock->sk;
1163 struct tipc_sock *tsk = tipc_sk(sk);
1164 struct tipc_group *grp = tsk->group;
1165 struct tipc_msg *hdr = &tsk->phdr;
1166 struct net *net = sock_net(sk);
1167 struct list_head dsts;
1168 u32 dstcnt, exclude;
1170 INIT_LIST_HEAD(&dsts);
1171 ua->sa.type = msg_nametype(hdr);
1172 ua->scope = msg_lookup_scope(hdr);
1173 exclude = tipc_group_exclude(grp);
1175 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1176 return -EHOSTUNREACH;
1179 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1180 return tipc_send_group_unicast(sock, m, dlen, timeout);
1183 tipc_dest_list_purge(&dsts);
1184 return tipc_send_group_bcast(sock, m, dlen, timeout);
1188 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1189 * @net: the associated network namespace
1190 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1191 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1193 * Multi-threaded: parallel calls with reference to same queues may occur
1195 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1196 struct sk_buff_head *inputq)
1198 u32 self = tipc_own_addr(net);
1199 struct sk_buff *skb, *_skb;
1201 struct sk_buff_head tmpq;
1202 struct list_head dports;
1203 struct tipc_msg *hdr;
1204 struct tipc_uaddr ua;
1205 int user, mtyp, hlen;
1207 __skb_queue_head_init(&tmpq);
1208 INIT_LIST_HEAD(&dports);
1209 ua.addrtype = TIPC_SERVICE_RANGE;
1211 /* tipc_skb_peek() increments the head skb's reference counter */
1212 skb = tipc_skb_peek(arrvq, &inputq->lock);
1213 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1215 user = msg_user(hdr);
1216 mtyp = msg_type(hdr);
1217 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1218 onode = msg_orignode(hdr);
1219 ua.sr.type = msg_nametype(hdr);
1220 ua.sr.lower = msg_namelower(hdr);
1221 ua.sr.upper = msg_nameupper(hdr);
1223 ua.scope = TIPC_ANY_SCOPE;
1225 ua.scope = TIPC_CLUSTER_SCOPE;
1227 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1228 spin_lock_bh(&inputq->lock);
1229 if (skb_peek(arrvq) == skb) {
1230 __skb_dequeue(arrvq);
1231 __skb_queue_tail(inputq, skb);
1234 spin_unlock_bh(&inputq->lock);
1238 /* Group messages require exact scope match */
1239 if (msg_in_group(hdr)) {
1242 ua.scope = msg_lookup_scope(hdr);
1245 /* Create destination port list: */
1246 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1248 /* Clone message per destination */
1249 while (tipc_dest_pop(&dports, NULL, &portid)) {
1250 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1252 msg_set_destport(buf_msg(_skb), portid);
1253 __skb_queue_tail(&tmpq, _skb);
1256 pr_warn("Failed to clone mcast rcv buffer\n");
1258 /* Append clones to inputq only if skb is still head of arrvq */
1259 spin_lock_bh(&inputq->lock);
1260 if (skb_peek(arrvq) == skb) {
1261 skb_queue_splice_tail_init(&tmpq, inputq);
1262 /* Decrement the skb's refcnt */
1263 kfree_skb(__skb_dequeue(arrvq));
1265 spin_unlock_bh(&inputq->lock);
1266 __skb_queue_purge(&tmpq);
1269 tipc_sk_rcv(net, inputq);
1272 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1273 * when socket is in Nagle mode
1275 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1277 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1278 struct sk_buff *skb = skb_peek_tail(txq);
1279 struct net *net = sock_net(&tsk->sk);
1280 u32 dnode = tsk_peer_node(tsk);
1284 tsk->pkt_cnt += skb_queue_len(txq);
1285 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1287 if (tsk->nagle_start < NAGLE_START_MAX)
1288 tsk->nagle_start *= 2;
1289 tsk->expect_ack = false;
1290 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1291 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1294 tsk->nagle_start = NAGLE_START_INIT;
1296 msg_set_ack_required(buf_msg(skb));
1297 tsk->expect_ack = true;
1299 tsk->expect_ack = false;
1306 if (!skb || tsk->cong_link_cnt)
1309 /* Do not send SYN again after congestion */
1310 if (msg_is_syn(buf_msg(skb)))
1314 tsk->pkt_cnt += skb_queue_len(txq);
1315 tsk->snt_unacked += tsk->snd_backlog;
1316 tsk->snd_backlog = 0;
1317 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1318 if (rc == -ELINKCONG)
1319 tsk->cong_link_cnt = 1;
1323 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1324 * @tsk: receiving socket
1325 * @skb: pointer to message buffer.
1326 * @inputq: buffer list containing the buffers
1327 * @xmitq: output message area
1329 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1330 struct sk_buff_head *inputq,
1331 struct sk_buff_head *xmitq)
1333 struct tipc_msg *hdr = buf_msg(skb);
1334 u32 onode = tsk_own_node(tsk);
1335 struct sock *sk = &tsk->sk;
1336 int mtyp = msg_type(hdr);
1339 /* Ignore if connection cannot be validated: */
1340 if (!tsk_peer_msg(tsk, hdr)) {
1341 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1345 if (unlikely(msg_errcode(hdr))) {
1346 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1347 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1348 tsk_peer_port(tsk));
1349 sk->sk_state_change(sk);
1351 /* State change is ignored if socket already awake,
1352 * - convert msg to abort msg and add to inqueue
1354 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1355 msg_set_type(hdr, TIPC_CONN_MSG);
1356 msg_set_size(hdr, BASIC_H_SIZE);
1357 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1358 __skb_queue_tail(inputq, skb);
1362 tsk->probe_unacked = false;
1364 if (mtyp == CONN_PROBE) {
1365 msg_set_type(hdr, CONN_PROBE_REPLY);
1366 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1367 __skb_queue_tail(xmitq, skb);
1369 } else if (mtyp == CONN_ACK) {
1370 was_cong = tsk_conn_cong(tsk);
1371 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1372 tsk->snt_unacked -= msg_conn_ack(hdr);
1373 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1374 tsk->snd_win = msg_adv_win(hdr);
1375 if (was_cong && !tsk_conn_cong(tsk))
1376 sk->sk_write_space(sk);
1377 } else if (mtyp != CONN_PROBE_REPLY) {
1378 pr_warn("Received unknown CONN_PROTO msg\n");
1385 * tipc_sendmsg - send message in connectionless manner
1386 * @sock: socket structure
1387 * @m: message to send
1388 * @dsz: amount of user data to be sent
1390 * Message must have an destination specified explicitly.
1391 * Used for SOCK_RDM and SOCK_DGRAM messages,
1392 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1393 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1395 * Return: the number of bytes sent on success, or errno otherwise
1397 static int tipc_sendmsg(struct socket *sock,
1398 struct msghdr *m, size_t dsz)
1400 struct sock *sk = sock->sk;
1404 ret = __tipc_sendmsg(sock, m, dsz);
1410 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1412 struct sock *sk = sock->sk;
1413 struct net *net = sock_net(sk);
1414 struct tipc_sock *tsk = tipc_sk(sk);
1415 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1416 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1417 struct list_head *clinks = &tsk->cong_links;
1418 bool syn = !tipc_sk_type_connectionless(sk);
1419 struct tipc_group *grp = tsk->group;
1420 struct tipc_msg *hdr = &tsk->phdr;
1421 struct tipc_socket_addr skaddr;
1422 struct sk_buff_head pkts;
1425 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1429 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1431 atype = ua->addrtype;
1434 /* If socket belongs to a communication group follow other paths */
1437 return tipc_send_group_bcast(sock, m, dlen, timeout);
1438 if (atype == TIPC_SERVICE_ADDR)
1439 return tipc_send_group_anycast(sock, m, dlen, timeout);
1440 if (atype == TIPC_SOCKET_ADDR)
1441 return tipc_send_group_unicast(sock, m, dlen, timeout);
1442 if (atype == TIPC_SERVICE_RANGE)
1443 return tipc_send_group_mcast(sock, m, dlen, timeout);
1448 ua = (struct tipc_uaddr *)&tsk->peer;
1449 if (!syn && ua->family != AF_TIPC)
1450 return -EDESTADDRREQ;
1451 atype = ua->addrtype;
1454 if (unlikely(syn)) {
1455 if (sk->sk_state == TIPC_LISTEN)
1457 if (sk->sk_state != TIPC_OPEN)
1461 if (atype == TIPC_SERVICE_ADDR)
1462 tsk->conn_addrtype = atype;
1463 msg_set_syn(hdr, 1);
1466 memset(&skaddr, 0, sizeof(skaddr));
1468 /* Determine destination */
1469 if (atype == TIPC_SERVICE_RANGE) {
1470 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1471 } else if (atype == TIPC_SERVICE_ADDR) {
1472 skaddr.node = ua->lookup_node;
1473 ua->scope = tipc_node2scope(skaddr.node);
1474 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1475 return -EHOSTUNREACH;
1476 } else if (atype == TIPC_SOCKET_ADDR) {
1482 /* Block or return if destination link is congested */
1483 rc = tipc_wait_for_cond(sock, &timeout,
1484 !tipc_dest_find(clinks, skaddr.node, 0));
1488 /* Finally build message header */
1489 msg_set_destnode(hdr, skaddr.node);
1490 msg_set_destport(hdr, skaddr.ref);
1491 if (atype == TIPC_SERVICE_ADDR) {
1492 msg_set_type(hdr, TIPC_NAMED_MSG);
1493 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1494 msg_set_nametype(hdr, ua->sa.type);
1495 msg_set_nameinst(hdr, ua->sa.instance);
1496 msg_set_lookup_scope(hdr, ua->scope);
1497 } else { /* TIPC_SOCKET_ADDR */
1498 msg_set_type(hdr, TIPC_DIRECT_MSG);
1499 msg_set_lookup_scope(hdr, 0);
1500 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1503 /* Add message body */
1504 __skb_queue_head_init(&pkts);
1505 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1506 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1507 if (unlikely(rc != dlen))
1509 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1510 __skb_queue_purge(&pkts);
1515 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1516 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1517 if (unlikely(rc == -ELINKCONG)) {
1518 tipc_dest_push(clinks, skaddr.node, 0);
1519 tsk->cong_link_cnt++;
1523 if (unlikely(syn && !rc)) {
1524 tipc_set_sk_state(sk, TIPC_CONNECTING);
1525 if (dlen && timeout) {
1526 timeout = msecs_to_jiffies(timeout);
1527 tipc_wait_for_connect(sock, &timeout);
1531 return rc ? rc : dlen;
1535 * tipc_sendstream - send stream-oriented data
1536 * @sock: socket structure
1538 * @dsz: total length of data to be transmitted
1540 * Used for SOCK_STREAM data.
1542 * Return: the number of bytes sent on success (or partial success),
1543 * or errno if no data sent
1545 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1547 struct sock *sk = sock->sk;
1551 ret = __tipc_sendstream(sock, m, dsz);
1557 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1559 struct sock *sk = sock->sk;
1560 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1561 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1562 struct sk_buff_head *txq = &sk->sk_write_queue;
1563 struct tipc_sock *tsk = tipc_sk(sk);
1564 struct tipc_msg *hdr = &tsk->phdr;
1565 struct net *net = sock_net(sk);
1566 struct sk_buff *skb;
1567 u32 dnode = tsk_peer_node(tsk);
1568 int maxnagle = tsk->maxnagle;
1569 int maxpkt = tsk->max_pkt;
1573 if (unlikely(dlen > INT_MAX))
1576 /* Handle implicit connection setup */
1577 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1578 rc = __tipc_sendmsg(sock, m, dlen);
1579 if (dlen && dlen == rc) {
1580 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1581 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1587 rc = tipc_wait_for_cond(sock, &timeout,
1588 (!tsk->cong_link_cnt &&
1589 !tsk_conn_cong(tsk) &&
1590 tipc_sk_connected(sk)));
1593 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1594 blocks = tsk->snd_backlog;
1595 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1597 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1598 if (unlikely(rc < 0))
1602 if (blocks <= 64 && tsk->expect_ack) {
1603 tsk->snd_backlog = blocks;
1606 } else if (blocks > 64) {
1607 tsk->pkt_cnt += skb_queue_len(txq);
1609 skb = skb_peek_tail(txq);
1611 msg_set_ack_required(buf_msg(skb));
1612 tsk->expect_ack = true;
1614 tsk->expect_ack = false;
1620 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1621 if (unlikely(rc != send))
1623 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1625 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1626 TIPC_DUMP_SK_SNDQ, " ");
1627 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1628 if (unlikely(rc == -ELINKCONG)) {
1629 tsk->cong_link_cnt = 1;
1633 tsk->snt_unacked += blocks;
1634 tsk->snd_backlog = 0;
1637 } while (sent < dlen && !rc);
1639 return sent ? sent : rc;
1643 * tipc_send_packet - send a connection-oriented message
1644 * @sock: socket structure
1645 * @m: message to send
1646 * @dsz: length of data to be transmitted
1648 * Used for SOCK_SEQPACKET messages.
1650 * Return: the number of bytes sent on success, or errno otherwise
1652 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1654 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1657 return tipc_sendstream(sock, m, dsz);
1660 /* tipc_sk_finish_conn - complete the setup of a connection
1662 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1665 struct sock *sk = &tsk->sk;
1666 struct net *net = sock_net(sk);
1667 struct tipc_msg *msg = &tsk->phdr;
1669 msg_set_syn(msg, 0);
1670 msg_set_destnode(msg, peer_node);
1671 msg_set_destport(msg, peer_port);
1672 msg_set_type(msg, TIPC_CONN_MSG);
1673 msg_set_lookup_scope(msg, 0);
1674 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1676 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1677 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1678 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1679 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1680 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1682 __skb_queue_purge(&sk->sk_write_queue);
1683 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1686 /* Fall back to message based flow control */
1687 tsk->rcv_win = FLOWCTL_MSG_WIN;
1688 tsk->snd_win = FLOWCTL_MSG_WIN;
1692 * tipc_sk_set_orig_addr - capture sender's address for received message
1693 * @m: descriptor for message info
1694 * @skb: received message
1696 * Note: Address is not captured if not requested by receiver.
1698 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1700 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1701 struct tipc_msg *hdr = buf_msg(skb);
1706 srcaddr->sock.family = AF_TIPC;
1707 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1708 srcaddr->sock.scope = 0;
1709 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1710 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1711 srcaddr->sock.addr.name.domain = 0;
1712 m->msg_namelen = sizeof(struct sockaddr_tipc);
1714 if (!msg_in_group(hdr))
1717 /* Group message users may also want to know sending member's id */
1718 srcaddr->member.family = AF_TIPC;
1719 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1720 srcaddr->member.scope = 0;
1721 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1722 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1723 srcaddr->member.addr.name.domain = 0;
1724 m->msg_namelen = sizeof(*srcaddr);
1728 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1729 * @m: descriptor for message info
1730 * @skb: received message buffer
1731 * @tsk: TIPC port associated with message
1733 * Note: Ancillary data is not captured if not requested by receiver.
1735 * Return: 0 if successful, otherwise errno
1737 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1738 struct tipc_sock *tsk)
1740 struct tipc_msg *hdr;
1745 if (likely(m->msg_controllen == 0))
1749 dlen = msg_data_sz(hdr);
1751 /* Capture errored message object, if any */
1752 if (msg_errcode(hdr)) {
1753 if (skb_linearize(skb))
1756 data[0] = msg_errcode(hdr);
1758 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1761 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1766 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1767 switch (msg_type(hdr)) {
1768 case TIPC_NAMED_MSG:
1770 data[0] = msg_nametype(hdr);
1771 data[1] = msg_namelower(hdr);
1774 case TIPC_MCAST_MSG:
1776 data[0] = msg_nametype(hdr);
1777 data[1] = msg_namelower(hdr);
1778 data[2] = msg_nameupper(hdr);
1781 has_addr = !!tsk->conn_addrtype;
1782 data[0] = msg_nametype(&tsk->phdr);
1783 data[1] = msg_nameinst(&tsk->phdr);
1791 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1794 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1796 struct sock *sk = &tsk->sk;
1797 struct sk_buff *skb = NULL;
1798 struct tipc_msg *msg;
1799 u32 peer_port = tsk_peer_port(tsk);
1800 u32 dnode = tsk_peer_node(tsk);
1802 if (!tipc_sk_connected(sk))
1804 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1805 dnode, tsk_own_node(tsk), peer_port,
1806 tsk->portid, TIPC_OK);
1810 msg_set_conn_ack(msg, tsk->rcv_unacked);
1811 tsk->rcv_unacked = 0;
1813 /* Adjust to and advertize the correct window limit */
1814 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1815 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1816 msg_set_adv_win(msg, tsk->rcv_win);
1821 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1823 struct sk_buff *skb;
1825 skb = tipc_sk_build_ack(tsk);
1829 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1830 msg_link_selector(buf_msg(skb)));
1833 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1835 struct sock *sk = sock->sk;
1836 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1837 long timeo = *timeop;
1838 int err = sock_error(sk);
1844 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1845 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1849 add_wait_queue(sk_sleep(sk), &wait);
1851 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1852 sched_annotate_sleep();
1854 remove_wait_queue(sk_sleep(sk), &wait);
1857 if (!skb_queue_empty(&sk->sk_receive_queue))
1862 err = sock_intr_errno(timeo);
1863 if (signal_pending(current))
1866 err = sock_error(sk);
1875 * tipc_recvmsg - receive packet-oriented message
1876 * @sock: network socket
1877 * @m: descriptor for message info
1878 * @buflen: length of user buffer area
1879 * @flags: receive flags
1881 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1882 * If the complete message doesn't fit in user area, truncate it.
1884 * Return: size of returned message data, errno otherwise
1886 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1887 size_t buflen, int flags)
1889 struct sock *sk = sock->sk;
1890 bool connected = !tipc_sk_type_connectionless(sk);
1891 struct tipc_sock *tsk = tipc_sk(sk);
1892 int rc, err, hlen, dlen, copy;
1893 struct tipc_skb_cb *skb_cb;
1894 struct sk_buff_head xmitq;
1895 struct tipc_msg *hdr;
1896 struct sk_buff *skb;
1900 /* Catch invalid receive requests */
1901 if (unlikely(!buflen))
1905 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1909 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1911 /* Step rcv queue to first msg with data or error; wait if necessary */
1913 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1916 skb = skb_peek(&sk->sk_receive_queue);
1917 skb_cb = TIPC_SKB_CB(skb);
1919 dlen = msg_data_sz(hdr);
1920 hlen = msg_hdr_sz(hdr);
1921 err = msg_errcode(hdr);
1922 grp_evt = msg_is_grp_evt(hdr);
1923 if (likely(dlen || err))
1925 tsk_advance_rx_queue(sk);
1928 /* Collect msg meta data, including error code and rejected data */
1929 tipc_sk_set_orig_addr(m, skb);
1930 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1935 /* Capture data if non-error msg, otherwise just set return value */
1937 int offset = skb_cb->bytes_read;
1939 copy = min_t(int, dlen - offset, buflen);
1940 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1943 if (unlikely(offset + copy < dlen)) {
1944 if (flags & MSG_EOR) {
1945 if (!(flags & MSG_PEEK))
1946 skb_cb->bytes_read = offset + copy;
1948 m->msg_flags |= MSG_TRUNC;
1949 skb_cb->bytes_read = 0;
1952 if (flags & MSG_EOR)
1953 m->msg_flags |= MSG_EOR;
1954 skb_cb->bytes_read = 0;
1959 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1965 /* Mark message as group event if applicable */
1966 if (unlikely(grp_evt)) {
1967 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1968 m->msg_flags |= MSG_EOR;
1969 m->msg_flags |= MSG_OOB;
1973 /* Caption of data or error code/rejected data was successful */
1974 if (unlikely(flags & MSG_PEEK))
1977 /* Send group flow control advertisement when applicable */
1978 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1979 __skb_queue_head_init(&xmitq);
1980 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1981 msg_orignode(hdr), msg_origport(hdr),
1983 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1986 if (skb_cb->bytes_read)
1989 tsk_advance_rx_queue(sk);
1991 if (likely(!connected))
1994 /* Send connection flow control advertisement when applicable */
1995 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1996 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1997 tipc_sk_send_ack(tsk);
2000 return rc ? rc : copy;
2004 * tipc_recvstream - receive stream-oriented data
2005 * @sock: network socket
2006 * @m: descriptor for message info
2007 * @buflen: total size of user buffer area
2008 * @flags: receive flags
2010 * Used for SOCK_STREAM messages only. If not enough data is available
2011 * will optionally wait for more; never truncates data.
2013 * Return: size of returned message data, errno otherwise
2015 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2016 size_t buflen, int flags)
2018 struct sock *sk = sock->sk;
2019 struct tipc_sock *tsk = tipc_sk(sk);
2020 struct sk_buff *skb;
2021 struct tipc_msg *hdr;
2022 struct tipc_skb_cb *skb_cb;
2023 bool peek = flags & MSG_PEEK;
2024 int offset, required, copy, copied = 0;
2025 int hlen, dlen, err, rc;
2028 /* Catch invalid receive attempts */
2029 if (unlikely(!buflen))
2034 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2038 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2039 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2042 /* Look at first msg in receive queue; wait if necessary */
2043 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2046 skb = skb_peek(&sk->sk_receive_queue);
2047 skb_cb = TIPC_SKB_CB(skb);
2049 dlen = msg_data_sz(hdr);
2050 hlen = msg_hdr_sz(hdr);
2051 err = msg_errcode(hdr);
2053 /* Discard any empty non-errored (SYN-) message */
2054 if (unlikely(!dlen && !err)) {
2055 tsk_advance_rx_queue(sk);
2059 /* Collect msg meta data, incl. error code and rejected data */
2061 tipc_sk_set_orig_addr(m, skb);
2062 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2068 /* Copy data if msg ok, otherwise return error/partial data */
2070 offset = skb_cb->bytes_read;
2071 copy = min_t(int, dlen - offset, buflen - copied);
2072 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2077 if (unlikely(offset < dlen)) {
2079 skb_cb->bytes_read = offset;
2084 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2093 tsk_advance_rx_queue(sk);
2095 /* Send connection flow control advertisement when applicable */
2096 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2097 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2098 tipc_sk_send_ack(tsk);
2100 /* Exit if all requested data or FIN/error received */
2101 if (copied == buflen || err)
2104 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2107 return copied ? copied : rc;
2111 * tipc_write_space - wake up thread if port congestion is released
2114 static void tipc_write_space(struct sock *sk)
2116 struct socket_wq *wq;
2119 wq = rcu_dereference(sk->sk_wq);
2120 if (skwq_has_sleeper(wq))
2121 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2122 EPOLLWRNORM | EPOLLWRBAND);
2127 * tipc_data_ready - wake up threads to indicate messages have been received
2130 static void tipc_data_ready(struct sock *sk)
2132 struct socket_wq *wq;
2134 trace_sk_data_ready(sk);
2137 wq = rcu_dereference(sk->sk_wq);
2138 if (skwq_has_sleeper(wq))
2139 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2140 EPOLLRDNORM | EPOLLRDBAND);
2144 static void tipc_sock_destruct(struct sock *sk)
2146 __skb_queue_purge(&sk->sk_receive_queue);
2149 static void tipc_sk_proto_rcv(struct sock *sk,
2150 struct sk_buff_head *inputq,
2151 struct sk_buff_head *xmitq)
2153 struct sk_buff *skb = __skb_dequeue(inputq);
2154 struct tipc_sock *tsk = tipc_sk(sk);
2155 struct tipc_msg *hdr = buf_msg(skb);
2156 struct tipc_group *grp = tsk->group;
2157 bool wakeup = false;
2159 switch (msg_user(hdr)) {
2161 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2164 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2165 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2167 tsk->cong_link_cnt--;
2169 tipc_sk_push_backlog(tsk, false);
2171 case GROUP_PROTOCOL:
2172 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2175 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2176 hdr, inputq, xmitq);
2183 sk->sk_write_space(sk);
2189 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2191 * @skb: pointer to message buffer.
2192 * @xmitq: for Nagle ACK if any
2193 * Return: true if message should be added to receive queue, false otherwise
2195 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2196 struct sk_buff_head *xmitq)
2198 struct sock *sk = &tsk->sk;
2199 struct net *net = sock_net(sk);
2200 struct tipc_msg *hdr = buf_msg(skb);
2201 bool con_msg = msg_connected(hdr);
2202 u32 pport = tsk_peer_port(tsk);
2203 u32 pnode = tsk_peer_node(tsk);
2204 u32 oport = msg_origport(hdr);
2205 u32 onode = msg_orignode(hdr);
2206 int err = msg_errcode(hdr);
2207 unsigned long delay;
2209 if (unlikely(msg_mcast(hdr)))
2213 switch (sk->sk_state) {
2214 case TIPC_CONNECTING:
2216 if (likely(con_msg)) {
2219 tipc_sk_finish_conn(tsk, oport, onode);
2220 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2221 /* ACK+ message with data is added to receive queue */
2222 if (msg_data_sz(hdr))
2224 /* Empty ACK-, - wake up sleeping connect() and drop */
2225 sk->sk_state_change(sk);
2226 msg_set_dest_droppable(hdr, 1);
2229 /* Ignore connectionless message if not from listening socket */
2230 if (oport != pport || onode != pnode)
2234 if (err != TIPC_ERR_OVERLOAD)
2237 /* Prepare for new setup attempt if we have a SYN clone */
2238 if (skb_queue_empty(&sk->sk_write_queue))
2240 get_random_bytes(&delay, 2);
2241 delay %= (tsk->conn_timeout / 4);
2242 delay = msecs_to_jiffies(delay + 100);
2243 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2246 case TIPC_DISCONNECTING:
2249 /* Accept only SYN message */
2250 if (!msg_is_syn(hdr) &&
2251 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2253 if (!con_msg && !err)
2256 case TIPC_ESTABLISHED:
2257 if (!skb_queue_empty(&sk->sk_write_queue))
2258 tipc_sk_push_backlog(tsk, false);
2259 /* Accept only connection-based messages sent by peer */
2260 if (likely(con_msg && !err && pport == oport &&
2262 if (msg_ack_required(hdr)) {
2263 struct sk_buff *skb;
2265 skb = tipc_sk_build_ack(tsk);
2267 msg_set_nagle_ack(buf_msg(skb));
2268 __skb_queue_tail(xmitq, skb);
2273 if (!tsk_peer_msg(tsk, hdr))
2277 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2278 tipc_node_remove_conn(net, pnode, tsk->portid);
2279 sk->sk_state_change(sk);
2282 pr_err("Unknown sk_state %u\n", sk->sk_state);
2284 /* Abort connection setup attempt */
2285 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2286 sk->sk_err = ECONNREFUSED;
2287 sk->sk_state_change(sk);
2292 * rcvbuf_limit - get proper overload limit of socket receive queue
2296 * For connection oriented messages, irrespective of importance,
2297 * default queue limit is 2 MB.
2299 * For connectionless messages, queue limits are based on message
2300 * importance as follows:
2302 * TIPC_LOW_IMPORTANCE (2 MB)
2303 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2304 * TIPC_HIGH_IMPORTANCE (8 MB)
2305 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2307 * Return: overload limit according to corresponding message importance
2309 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2311 struct tipc_sock *tsk = tipc_sk(sk);
2312 struct tipc_msg *hdr = buf_msg(skb);
2314 if (unlikely(msg_in_group(hdr)))
2315 return READ_ONCE(sk->sk_rcvbuf);
2317 if (unlikely(!msg_connected(hdr)))
2318 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2320 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2321 return READ_ONCE(sk->sk_rcvbuf);
2323 return FLOWCTL_MSG_LIM;
2327 * tipc_sk_filter_rcv - validate incoming message
2329 * @skb: pointer to message.
2330 * @xmitq: output message area (FIXME)
2332 * Enqueues message on receive queue if acceptable; optionally handles
2333 * disconnect indication for a connected socket.
2335 * Called with socket lock already taken
2337 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2338 struct sk_buff_head *xmitq)
2340 bool sk_conn = !tipc_sk_type_connectionless(sk);
2341 struct tipc_sock *tsk = tipc_sk(sk);
2342 struct tipc_group *grp = tsk->group;
2343 struct tipc_msg *hdr = buf_msg(skb);
2344 struct net *net = sock_net(sk);
2345 struct sk_buff_head inputq;
2346 int mtyp = msg_type(hdr);
2347 int limit, err = TIPC_OK;
2349 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2350 TIPC_SKB_CB(skb)->bytes_read = 0;
2351 __skb_queue_head_init(&inputq);
2352 __skb_queue_tail(&inputq, skb);
2354 if (unlikely(!msg_isdata(hdr)))
2355 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2358 tipc_group_filter_msg(grp, &inputq, xmitq);
2360 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2361 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2363 /* Validate and add to receive buffer if there is space */
2364 while ((skb = __skb_dequeue(&inputq))) {
2366 limit = rcvbuf_limit(sk, skb);
2367 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2368 (!sk_conn && msg_connected(hdr)) ||
2369 (!grp && msg_in_group(hdr)))
2370 err = TIPC_ERR_NO_PORT;
2371 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2372 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2374 atomic_inc(&sk->sk_drops);
2375 err = TIPC_ERR_OVERLOAD;
2378 if (unlikely(err)) {
2379 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2380 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2382 __skb_queue_tail(xmitq, skb);
2387 __skb_queue_tail(&sk->sk_receive_queue, skb);
2388 skb_set_owner_r(skb, sk);
2389 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2390 "rcvq >90% allocated!");
2391 sk->sk_data_ready(sk);
2396 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2400 * Caller must hold socket lock
2402 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2404 unsigned int before = sk_rmem_alloc_get(sk);
2405 struct sk_buff_head xmitq;
2408 __skb_queue_head_init(&xmitq);
2410 tipc_sk_filter_rcv(sk, skb, &xmitq);
2411 added = sk_rmem_alloc_get(sk) - before;
2412 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2414 /* Send pending response/rejected messages, if any */
2415 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2420 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2421 * inputq and try adding them to socket or backlog queue
2422 * @inputq: list of incoming buffers with potentially different destinations
2423 * @sk: socket where the buffers should be enqueued
2424 * @dport: port number for the socket
2425 * @xmitq: output queue
2427 * Caller must hold socket lock
2429 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2430 u32 dport, struct sk_buff_head *xmitq)
2432 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2433 struct sk_buff *skb;
2438 while (skb_queue_len(inputq)) {
2439 if (unlikely(time_after_eq(jiffies, time_limit)))
2442 skb = tipc_skb_dequeue(inputq, dport);
2446 /* Add message directly to receive queue if possible */
2447 if (!sock_owned_by_user(sk)) {
2448 tipc_sk_filter_rcv(sk, skb, xmitq);
2452 /* Try backlog, compensating for double-counted bytes */
2453 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2454 if (!sk->sk_backlog.len)
2455 atomic_set(dcnt, 0);
2456 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2457 if (likely(!sk_add_backlog(sk, skb, lim))) {
2458 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2459 "bklg & rcvq >90% allocated!");
2463 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2464 /* Overload => reject message back to sender */
2465 onode = tipc_own_addr(sock_net(sk));
2466 atomic_inc(&sk->sk_drops);
2467 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2468 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2470 __skb_queue_tail(xmitq, skb);
2477 * tipc_sk_rcv - handle a chain of incoming buffers
2478 * @net: the associated network namespace
2479 * @inputq: buffer list containing the buffers
2480 * Consumes all buffers in list until inputq is empty
2481 * Note: may be called in multiple threads referring to the same queue
2483 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2485 struct sk_buff_head xmitq;
2486 u32 dnode, dport = 0;
2488 struct tipc_sock *tsk;
2490 struct sk_buff *skb;
2492 __skb_queue_head_init(&xmitq);
2493 while (skb_queue_len(inputq)) {
2494 dport = tipc_skb_peek_port(inputq, dport);
2495 tsk = tipc_sk_lookup(net, dport);
2499 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2500 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2501 spin_unlock_bh(&sk->sk_lock.slock);
2503 /* Send pending response/rejected messages, if any */
2504 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2508 /* No destination socket => dequeue skb if still there */
2509 skb = tipc_skb_dequeue(inputq, dport);
2513 /* Try secondary lookup if unresolved named message */
2514 err = TIPC_ERR_NO_PORT;
2515 if (tipc_msg_lookup_dest(net, skb, &err))
2518 /* Prepare for message rejection */
2519 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2522 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2524 dnode = msg_destnode(buf_msg(skb));
2525 tipc_node_xmit_skb(net, skb, dnode, dport);
2529 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2531 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2532 struct sock *sk = sock->sk;
2536 int err = sock_error(sk);
2541 if (signal_pending(current))
2542 return sock_intr_errno(*timeo_p);
2543 if (sk->sk_state == TIPC_DISCONNECTING)
2546 add_wait_queue(sk_sleep(sk), &wait);
2547 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2549 remove_wait_queue(sk_sleep(sk), &wait);
2554 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2556 if (addr->family != AF_TIPC)
2558 if (addr->addrtype == TIPC_SERVICE_RANGE)
2559 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2560 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2561 addr->addrtype == TIPC_SOCKET_ADDR);
2565 * tipc_connect - establish a connection to another TIPC port
2566 * @sock: socket structure
2567 * @dest: socket address for destination port
2568 * @destlen: size of socket address data structure
2569 * @flags: file-related flags associated with socket
2571 * Return: 0 on success, errno otherwise
2573 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2574 int destlen, int flags)
2576 struct sock *sk = sock->sk;
2577 struct tipc_sock *tsk = tipc_sk(sk);
2578 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2579 struct msghdr m = {NULL,};
2580 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2584 if (destlen != sizeof(struct sockaddr_tipc))
2594 if (dst->family == AF_UNSPEC) {
2595 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2596 if (!tipc_sk_type_connectionless(sk))
2600 if (!tipc_sockaddr_is_sane(dst)) {
2604 /* DGRAM/RDM connect(), just save the destaddr */
2605 if (tipc_sk_type_connectionless(sk)) {
2606 memcpy(&tsk->peer, dest, destlen);
2608 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2613 previous = sk->sk_state;
2615 switch (sk->sk_state) {
2617 /* Send a 'SYN-' to destination */
2619 m.msg_namelen = destlen;
2620 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2622 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2623 * indicate send_msg() is never blocked.
2626 m.msg_flags = MSG_DONTWAIT;
2628 res = __tipc_sendmsg(sock, &m, 0);
2629 if ((res < 0) && (res != -EWOULDBLOCK))
2632 /* Just entered TIPC_CONNECTING state; the only
2633 * difference is that return value in non-blocking
2634 * case is EINPROGRESS, rather than EALREADY.
2638 case TIPC_CONNECTING:
2640 if (previous == TIPC_CONNECTING)
2644 timeout = msecs_to_jiffies(timeout);
2645 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2646 res = tipc_wait_for_connect(sock, &timeout);
2648 case TIPC_ESTABLISHED:
2661 * tipc_listen - allow socket to listen for incoming connections
2662 * @sock: socket structure
2665 * Return: 0 on success, errno otherwise
2667 static int tipc_listen(struct socket *sock, int len)
2669 struct sock *sk = sock->sk;
2673 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2679 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2681 struct sock *sk = sock->sk;
2682 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2685 /* True wake-one mechanism for incoming connections: only
2686 * one process gets woken up, not the 'whole herd'.
2687 * Since we do not 'race & poll' for established sockets
2688 * anymore, the common case will execute the loop only once.
2691 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2692 add_wait_queue(sk_sleep(sk), &wait);
2694 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2696 remove_wait_queue(sk_sleep(sk), &wait);
2699 if (!skb_queue_empty(&sk->sk_receive_queue))
2704 err = sock_intr_errno(timeo);
2705 if (signal_pending(current))
2712 * tipc_accept - wait for connection request
2713 * @sock: listening socket
2714 * @new_sock: new socket that is to be connected
2715 * @flags: file-related flags associated with socket
2716 * @kern: caused by kernel or by userspace?
2718 * Return: 0 on success, errno otherwise
2720 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2723 struct sock *new_sk, *sk = sock->sk;
2724 struct tipc_sock *new_tsock;
2725 struct msghdr m = {NULL,};
2726 struct tipc_msg *msg;
2727 struct sk_buff *buf;
2733 if (sk->sk_state != TIPC_LISTEN) {
2737 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2738 res = tipc_wait_for_accept(sock, timeo);
2742 buf = skb_peek(&sk->sk_receive_queue);
2744 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2747 security_sk_clone(sock->sk, new_sock->sk);
2749 new_sk = new_sock->sk;
2750 new_tsock = tipc_sk(new_sk);
2753 /* we lock on new_sk; but lockdep sees the lock on sk */
2754 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2757 * Reject any stray messages received by new socket
2758 * before the socket lock was taken (very, very unlikely)
2760 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2762 /* Connect new socket to it's peer */
2763 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2765 tsk_set_importance(new_sk, msg_importance(msg));
2766 if (msg_named(msg)) {
2767 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2768 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2769 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2773 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2774 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2776 if (!msg_data_sz(msg)) {
2777 tsk_advance_rx_queue(sk);
2779 __skb_dequeue(&sk->sk_receive_queue);
2780 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2781 skb_set_owner_r(buf, new_sk);
2783 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2784 __tipc_sendstream(new_sock, &m, 0);
2785 release_sock(new_sk);
2792 * tipc_shutdown - shutdown socket connection
2793 * @sock: socket structure
2794 * @how: direction to close (must be SHUT_RDWR)
2796 * Terminates connection (if necessary), then purges socket's receive queue.
2798 * Return: 0 on success, errno otherwise
2800 static int tipc_shutdown(struct socket *sock, int how)
2802 struct sock *sk = sock->sk;
2805 if (how != SHUT_RDWR)
2810 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2811 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2812 sk->sk_shutdown = SHUTDOWN_MASK;
2814 if (sk->sk_state == TIPC_DISCONNECTING) {
2815 /* Discard any unreceived messages */
2816 __skb_queue_purge(&sk->sk_receive_queue);
2822 /* Wake up anyone sleeping in poll. */
2823 sk->sk_state_change(sk);
2829 static void tipc_sk_check_probing_state(struct sock *sk,
2830 struct sk_buff_head *list)
2832 struct tipc_sock *tsk = tipc_sk(sk);
2833 u32 pnode = tsk_peer_node(tsk);
2834 u32 pport = tsk_peer_port(tsk);
2835 u32 self = tsk_own_node(tsk);
2836 u32 oport = tsk->portid;
2837 struct sk_buff *skb;
2839 if (tsk->probe_unacked) {
2840 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2841 sk->sk_err = ECONNABORTED;
2842 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2843 sk->sk_state_change(sk);
2846 /* Prepare new probe */
2847 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2848 pnode, self, pport, oport, TIPC_OK);
2850 __skb_queue_tail(list, skb);
2851 tsk->probe_unacked = true;
2852 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2855 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2857 struct tipc_sock *tsk = tipc_sk(sk);
2859 /* Try again later if dest link is congested */
2860 if (tsk->cong_link_cnt) {
2861 sk_reset_timer(sk, &sk->sk_timer,
2862 jiffies + msecs_to_jiffies(100));
2865 /* Prepare SYN for retransmit */
2866 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2869 static void tipc_sk_timeout(struct timer_list *t)
2871 struct sock *sk = from_timer(sk, t, sk_timer);
2872 struct tipc_sock *tsk = tipc_sk(sk);
2873 u32 pnode = tsk_peer_node(tsk);
2874 struct sk_buff_head list;
2877 __skb_queue_head_init(&list);
2880 /* Try again later if socket is busy */
2881 if (sock_owned_by_user(sk)) {
2882 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2888 if (sk->sk_state == TIPC_ESTABLISHED)
2889 tipc_sk_check_probing_state(sk, &list);
2890 else if (sk->sk_state == TIPC_CONNECTING)
2891 tipc_sk_retry_connect(sk, &list);
2895 if (!skb_queue_empty(&list))
2896 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2898 /* SYN messages may cause link congestion */
2899 if (rc == -ELINKCONG) {
2900 tipc_dest_push(&tsk->cong_links, pnode, 0);
2901 tsk->cong_link_cnt = 1;
2906 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2908 struct sock *sk = &tsk->sk;
2909 struct net *net = sock_net(sk);
2910 struct tipc_socket_addr skaddr;
2911 struct publication *p;
2914 if (tipc_sk_connected(sk))
2916 key = tsk->portid + tsk->pub_count + 1;
2917 if (key == tsk->portid)
2919 skaddr.ref = tsk->portid;
2920 skaddr.node = tipc_own_addr(net);
2921 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2925 list_add(&p->binding_sock, &tsk->publications);
2927 tsk->published = true;
2931 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2933 struct net *net = sock_net(&tsk->sk);
2934 struct publication *safe, *p;
2935 struct tipc_uaddr _ua;
2938 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2940 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2941 p->sr.type, p->sr.lower, p->sr.upper);
2942 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2945 /* Unbind specific publication */
2946 if (p->scope != ua->scope)
2948 if (p->sr.type != ua->sr.type)
2950 if (p->sr.lower != ua->sr.lower)
2952 if (p->sr.upper != ua->sr.upper)
2954 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2958 if (list_empty(&tsk->publications)) {
2965 /* tipc_sk_reinit: set non-zero address in all existing sockets
2966 * when we go from standalone to network mode.
2968 void tipc_sk_reinit(struct net *net)
2970 struct tipc_net *tn = net_generic(net, tipc_net_id);
2971 struct rhashtable_iter iter;
2972 struct tipc_sock *tsk;
2973 struct tipc_msg *msg;
2975 rhashtable_walk_enter(&tn->sk_rht, &iter);
2978 rhashtable_walk_start(&iter);
2980 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2981 sock_hold(&tsk->sk);
2982 rhashtable_walk_stop(&iter);
2983 lock_sock(&tsk->sk);
2985 msg_set_prevnode(msg, tipc_own_addr(net));
2986 msg_set_orignode(msg, tipc_own_addr(net));
2987 release_sock(&tsk->sk);
2988 rhashtable_walk_start(&iter);
2992 rhashtable_walk_stop(&iter);
2993 } while (tsk == ERR_PTR(-EAGAIN));
2995 rhashtable_walk_exit(&iter);
2998 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
3000 struct tipc_net *tn = net_generic(net, tipc_net_id);
3001 struct tipc_sock *tsk;
3004 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
3006 sock_hold(&tsk->sk);
3012 static int tipc_sk_insert(struct tipc_sock *tsk)
3014 struct sock *sk = &tsk->sk;
3015 struct net *net = sock_net(sk);
3016 struct tipc_net *tn = net_generic(net, tipc_net_id);
3017 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3018 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3020 while (remaining--) {
3022 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3023 portid = TIPC_MIN_PORT;
3024 tsk->portid = portid;
3025 sock_hold(&tsk->sk);
3026 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3035 static void tipc_sk_remove(struct tipc_sock *tsk)
3037 struct sock *sk = &tsk->sk;
3038 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3040 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3041 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3046 static const struct rhashtable_params tsk_rht_params = {
3048 .head_offset = offsetof(struct tipc_sock, node),
3049 .key_offset = offsetof(struct tipc_sock, portid),
3050 .key_len = sizeof(u32), /* portid */
3051 .max_size = 1048576,
3053 .automatic_shrinking = true,
3056 int tipc_sk_rht_init(struct net *net)
3058 struct tipc_net *tn = net_generic(net, tipc_net_id);
3060 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3063 void tipc_sk_rht_destroy(struct net *net)
3065 struct tipc_net *tn = net_generic(net, tipc_net_id);
3067 /* Wait for socket readers to complete */
3070 rhashtable_destroy(&tn->sk_rht);
3073 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3075 struct net *net = sock_net(&tsk->sk);
3076 struct tipc_group *grp = tsk->group;
3077 struct tipc_msg *hdr = &tsk->phdr;
3078 struct tipc_uaddr ua;
3081 if (mreq->type < TIPC_RESERVED_TYPES)
3083 if (mreq->scope > TIPC_NODE_SCOPE)
3085 if (mreq->scope != TIPC_NODE_SCOPE)
3086 mreq->scope = TIPC_CLUSTER_SCOPE;
3089 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3093 msg_set_lookup_scope(hdr, mreq->scope);
3094 msg_set_nametype(hdr, mreq->type);
3095 msg_set_dest_droppable(hdr, true);
3096 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3097 mreq->type, mreq->instance, mreq->instance);
3098 tipc_nametbl_build_group(net, grp, &ua);
3099 rc = tipc_sk_publish(tsk, &ua);
3101 tipc_group_delete(net, grp);
3105 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3106 tsk->mc_method.rcast = true;
3107 tsk->mc_method.mandatory = true;
3108 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3112 static int tipc_sk_leave(struct tipc_sock *tsk)
3114 struct net *net = sock_net(&tsk->sk);
3115 struct tipc_group *grp = tsk->group;
3116 struct tipc_uaddr ua;
3121 ua.addrtype = TIPC_SERVICE_RANGE;
3122 tipc_group_self(grp, &ua.sr, &scope);
3124 tipc_group_delete(net, grp);
3126 tipc_sk_withdraw(tsk, &ua);
3131 * tipc_setsockopt - set socket option
3132 * @sock: socket structure
3133 * @lvl: option level
3134 * @opt: option identifier
3135 * @ov: pointer to new option value
3136 * @ol: length of option value
3138 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3139 * (to ease compatibility).
3141 * Return: 0 on success, errno otherwise
3143 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3144 sockptr_t ov, unsigned int ol)
3146 struct sock *sk = sock->sk;
3147 struct tipc_sock *tsk = tipc_sk(sk);
3148 struct tipc_group_req mreq;
3152 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3154 if (lvl != SOL_TIPC)
3155 return -ENOPROTOOPT;
3158 case TIPC_IMPORTANCE:
3159 case TIPC_SRC_DROPPABLE:
3160 case TIPC_DEST_DROPPABLE:
3161 case TIPC_CONN_TIMEOUT:
3163 if (ol < sizeof(value))
3165 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3168 case TIPC_GROUP_JOIN:
3169 if (ol < sizeof(mreq))
3171 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3175 if (!sockptr_is_null(ov) || ol)
3182 case TIPC_IMPORTANCE:
3183 res = tsk_set_importance(sk, value);
3185 case TIPC_SRC_DROPPABLE:
3186 if (sock->type != SOCK_STREAM)
3187 tsk_set_unreliable(tsk, value);
3191 case TIPC_DEST_DROPPABLE:
3192 tsk_set_unreturnable(tsk, value);
3194 case TIPC_CONN_TIMEOUT:
3195 tipc_sk(sk)->conn_timeout = value;
3197 case TIPC_MCAST_BROADCAST:
3198 tsk->mc_method.rcast = false;
3199 tsk->mc_method.mandatory = true;
3201 case TIPC_MCAST_REPLICAST:
3202 tsk->mc_method.rcast = true;
3203 tsk->mc_method.mandatory = true;
3205 case TIPC_GROUP_JOIN:
3206 res = tipc_sk_join(tsk, &mreq);
3208 case TIPC_GROUP_LEAVE:
3209 res = tipc_sk_leave(tsk);
3212 tsk->nodelay = !!value;
3225 * tipc_getsockopt - get socket option
3226 * @sock: socket structure
3227 * @lvl: option level
3228 * @opt: option identifier
3229 * @ov: receptacle for option value
3230 * @ol: receptacle for length of option value
3232 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3233 * (to ease compatibility).
3235 * Return: 0 on success, errno otherwise
3237 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3238 char __user *ov, int __user *ol)
3240 struct sock *sk = sock->sk;
3241 struct tipc_sock *tsk = tipc_sk(sk);
3242 struct tipc_service_range seq;
3247 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3248 return put_user(0, ol);
3249 if (lvl != SOL_TIPC)
3250 return -ENOPROTOOPT;
3251 res = get_user(len, ol);
3258 case TIPC_IMPORTANCE:
3259 value = tsk_importance(tsk);
3261 case TIPC_SRC_DROPPABLE:
3262 value = tsk_unreliable(tsk);
3264 case TIPC_DEST_DROPPABLE:
3265 value = tsk_unreturnable(tsk);
3267 case TIPC_CONN_TIMEOUT:
3268 value = tsk->conn_timeout;
3269 /* no need to set "res", since already 0 at this point */
3271 case TIPC_NODE_RECVQ_DEPTH:
3272 value = 0; /* was tipc_queue_size, now obsolete */
3274 case TIPC_SOCK_RECVQ_DEPTH:
3275 value = skb_queue_len(&sk->sk_receive_queue);
3277 case TIPC_SOCK_RECVQ_USED:
3278 value = sk_rmem_alloc_get(sk);
3280 case TIPC_GROUP_JOIN:
3283 tipc_group_self(tsk->group, &seq, &scope);
3293 return res; /* "get" failed */
3295 if (len < sizeof(value))
3298 if (copy_to_user(ov, &value, sizeof(value)))
3301 return put_user(sizeof(value), ol);
3304 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3306 struct net *net = sock_net(sock->sk);
3307 struct tipc_sioc_nodeid_req nr = {0};
3308 struct tipc_sioc_ln_req lnr;
3309 void __user *argp = (void __user *)arg;
3312 case SIOCGETLINKNAME:
3313 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3315 if (!tipc_node_get_linkname(net,
3316 lnr.bearer_id & 0xffff, lnr.peer,
3317 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3318 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3322 return -EADDRNOTAVAIL;
3324 if (copy_from_user(&nr, argp, sizeof(nr)))
3326 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3327 return -EADDRNOTAVAIL;
3328 if (copy_to_user(argp, &nr, sizeof(nr)))
3332 return -ENOIOCTLCMD;
3336 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3338 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3339 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3340 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3342 tsk1->peer.family = AF_TIPC;
3343 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3344 tsk1->peer.scope = TIPC_NODE_SCOPE;
3345 tsk1->peer.addr.id.ref = tsk2->portid;
3346 tsk1->peer.addr.id.node = onode;
3347 tsk2->peer.family = AF_TIPC;
3348 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3349 tsk2->peer.scope = TIPC_NODE_SCOPE;
3350 tsk2->peer.addr.id.ref = tsk1->portid;
3351 tsk2->peer.addr.id.node = onode;
3353 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3354 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3358 /* Protocol switches for the various types of TIPC sockets */
3360 static const struct proto_ops msg_ops = {
3361 .owner = THIS_MODULE,
3363 .release = tipc_release,
3365 .connect = tipc_connect,
3366 .socketpair = tipc_socketpair,
3367 .accept = sock_no_accept,
3368 .getname = tipc_getname,
3370 .ioctl = tipc_ioctl,
3371 .listen = sock_no_listen,
3372 .shutdown = tipc_shutdown,
3373 .setsockopt = tipc_setsockopt,
3374 .getsockopt = tipc_getsockopt,
3375 .sendmsg = tipc_sendmsg,
3376 .recvmsg = tipc_recvmsg,
3377 .mmap = sock_no_mmap,
3380 static const struct proto_ops packet_ops = {
3381 .owner = THIS_MODULE,
3383 .release = tipc_release,
3385 .connect = tipc_connect,
3386 .socketpair = tipc_socketpair,
3387 .accept = tipc_accept,
3388 .getname = tipc_getname,
3390 .ioctl = tipc_ioctl,
3391 .listen = tipc_listen,
3392 .shutdown = tipc_shutdown,
3393 .setsockopt = tipc_setsockopt,
3394 .getsockopt = tipc_getsockopt,
3395 .sendmsg = tipc_send_packet,
3396 .recvmsg = tipc_recvmsg,
3397 .mmap = sock_no_mmap,
3400 static const struct proto_ops stream_ops = {
3401 .owner = THIS_MODULE,
3403 .release = tipc_release,
3405 .connect = tipc_connect,
3406 .socketpair = tipc_socketpair,
3407 .accept = tipc_accept,
3408 .getname = tipc_getname,
3410 .ioctl = tipc_ioctl,
3411 .listen = tipc_listen,
3412 .shutdown = tipc_shutdown,
3413 .setsockopt = tipc_setsockopt,
3414 .getsockopt = tipc_getsockopt,
3415 .sendmsg = tipc_sendstream,
3416 .recvmsg = tipc_recvstream,
3417 .mmap = sock_no_mmap,
3420 static const struct net_proto_family tipc_family_ops = {
3421 .owner = THIS_MODULE,
3423 .create = tipc_sk_create
3426 static struct proto tipc_proto = {
3428 .owner = THIS_MODULE,
3429 .obj_size = sizeof(struct tipc_sock),
3430 .sysctl_rmem = sysctl_tipc_rmem
3434 * tipc_socket_init - initialize TIPC socket interface
3436 * Return: 0 on success, errno otherwise
3438 int tipc_socket_init(void)
3442 res = proto_register(&tipc_proto, 1);
3444 pr_err("Failed to register TIPC protocol type\n");
3448 res = sock_register(&tipc_family_ops);
3450 pr_err("Failed to register TIPC socket type\n");
3451 proto_unregister(&tipc_proto);
3459 * tipc_socket_stop - stop TIPC socket interface
3461 void tipc_socket_stop(void)
3463 sock_unregister(tipc_family_ops.family);
3464 proto_unregister(&tipc_proto);
3467 /* Caller should hold socket lock for the passed tipc socket. */
3468 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3470 u32 peer_node, peer_port;
3471 u32 conn_type, conn_instance;
3472 struct nlattr *nest;
3474 peer_node = tsk_peer_node(tsk);
3475 peer_port = tsk_peer_port(tsk);
3476 conn_type = msg_nametype(&tsk->phdr);
3477 conn_instance = msg_nameinst(&tsk->phdr);
3478 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3482 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3484 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3487 if (tsk->conn_addrtype != 0) {
3488 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3490 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3492 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3495 nla_nest_end(skb, nest);
3500 nla_nest_cancel(skb, nest);
3505 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3508 struct net *net = sock_net(skb->sk);
3509 struct sock *sk = &tsk->sk;
3511 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3512 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3515 if (tipc_sk_connected(sk)) {
3516 if (__tipc_nl_add_sk_con(skb, tsk))
3518 } else if (!list_empty(&tsk->publications)) {
3519 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3525 /* Caller should hold socket lock for the passed tipc socket. */
3526 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3527 struct tipc_sock *tsk)
3529 struct nlattr *attrs;
3532 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3533 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3537 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3539 goto genlmsg_cancel;
3541 if (__tipc_nl_add_sk_info(skb, tsk))
3542 goto attr_msg_cancel;
3544 nla_nest_end(skb, attrs);
3545 genlmsg_end(skb, hdr);
3550 nla_nest_cancel(skb, attrs);
3552 genlmsg_cancel(skb, hdr);
3557 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3558 int (*skb_handler)(struct sk_buff *skb,
3559 struct netlink_callback *cb,
3560 struct tipc_sock *tsk))
3562 struct rhashtable_iter *iter = (void *)cb->args[4];
3563 struct tipc_sock *tsk;
3566 rhashtable_walk_start(iter);
3567 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3570 if (err == -EAGAIN) {
3577 sock_hold(&tsk->sk);
3578 rhashtable_walk_stop(iter);
3579 lock_sock(&tsk->sk);
3580 err = skb_handler(skb, cb, tsk);
3582 release_sock(&tsk->sk);
3586 release_sock(&tsk->sk);
3587 rhashtable_walk_start(iter);
3590 rhashtable_walk_stop(iter);
3594 EXPORT_SYMBOL(tipc_nl_sk_walk);
3596 int tipc_dump_start(struct netlink_callback *cb)
3598 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3600 EXPORT_SYMBOL(tipc_dump_start);
3602 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3604 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3605 struct rhashtable_iter *iter = (void *)cb->args[4];
3606 struct tipc_net *tn = tipc_net(net);
3609 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3613 cb->args[4] = (long)iter;
3616 rhashtable_walk_enter(&tn->sk_rht, iter);
3620 int tipc_dump_done(struct netlink_callback *cb)
3622 struct rhashtable_iter *hti = (void *)cb->args[4];
3624 rhashtable_walk_exit(hti);
3628 EXPORT_SYMBOL(tipc_dump_done);
3630 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3631 struct tipc_sock *tsk, u32 sk_filter_state,
3632 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3634 struct sock *sk = &tsk->sk;
3635 struct nlattr *attrs;
3636 struct nlattr *stat;
3638 /*filter response w.r.t sk_state*/
3639 if (!(sk_filter_state & (1 << sk->sk_state)))
3642 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3646 if (__tipc_nl_add_sk_info(skb, tsk))
3647 goto attr_msg_cancel;
3649 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3650 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3651 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3652 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3653 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3655 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3656 tipc_diag_gen_cookie(sk),
3658 goto attr_msg_cancel;
3660 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3662 goto attr_msg_cancel;
3664 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3665 skb_queue_len(&sk->sk_receive_queue)) ||
3666 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3667 skb_queue_len(&sk->sk_write_queue)) ||
3668 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3669 atomic_read(&sk->sk_drops)))
3670 goto stat_msg_cancel;
3672 if (tsk->cong_link_cnt &&
3673 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3674 goto stat_msg_cancel;
3676 if (tsk_conn_cong(tsk) &&
3677 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3678 goto stat_msg_cancel;
3680 nla_nest_end(skb, stat);
3683 if (tipc_group_fill_sock_diag(tsk->group, skb))
3684 goto stat_msg_cancel;
3686 nla_nest_end(skb, attrs);
3691 nla_nest_cancel(skb, stat);
3693 nla_nest_cancel(skb, attrs);
3697 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3699 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3701 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3704 /* Caller should hold socket lock for the passed tipc socket. */
3705 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3706 struct netlink_callback *cb,
3707 struct publication *publ)
3710 struct nlattr *attrs;
3712 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3713 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3717 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3719 goto genlmsg_cancel;
3721 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3722 goto attr_msg_cancel;
3723 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3724 goto attr_msg_cancel;
3725 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3726 goto attr_msg_cancel;
3727 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3728 goto attr_msg_cancel;
3730 nla_nest_end(skb, attrs);
3731 genlmsg_end(skb, hdr);
3736 nla_nest_cancel(skb, attrs);
3738 genlmsg_cancel(skb, hdr);
3743 /* Caller should hold socket lock for the passed tipc socket. */
3744 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3745 struct netlink_callback *cb,
3746 struct tipc_sock *tsk, u32 *last_publ)
3749 struct publication *p;
3752 list_for_each_entry(p, &tsk->publications, binding_sock) {
3753 if (p->key == *last_publ)
3756 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3757 /* We never set seq or call nl_dump_check_consistent()
3758 * this means that setting prev_seq here will cause the
3759 * consistence check to fail in the netlink callback
3760 * handler. Resulting in the last NLMSG_DONE message
3761 * having the NLM_F_DUMP_INTR flag set.
3768 p = list_first_entry(&tsk->publications, struct publication,
3772 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3773 err = __tipc_nl_add_sk_publ(skb, cb, p);
3775 *last_publ = p->key;
3784 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3787 u32 tsk_portid = cb->args[0];
3788 u32 last_publ = cb->args[1];
3789 u32 done = cb->args[2];
3790 struct net *net = sock_net(skb->sk);
3791 struct tipc_sock *tsk;
3794 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3795 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3797 if (!attrs[TIPC_NLA_SOCK])
3800 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3801 attrs[TIPC_NLA_SOCK],
3802 tipc_nl_sock_policy, NULL);
3806 if (!sock[TIPC_NLA_SOCK_REF])
3809 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3815 tsk = tipc_sk_lookup(net, tsk_portid);
3819 lock_sock(&tsk->sk);
3820 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3823 release_sock(&tsk->sk);
3826 cb->args[0] = tsk_portid;
3827 cb->args[1] = last_publ;
3834 * tipc_sk_filtering - check if a socket should be traced
3835 * @sk: the socket to be examined
3837 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3838 * (portid, sock type, name type, name lower, name upper)
3840 * Return: true if the socket meets the socket tuple data
3841 * (value 0 = 'any') or when there is no tuple set (all = 0),
3844 bool tipc_sk_filtering(struct sock *sk)
3846 struct tipc_sock *tsk;
3847 struct publication *p;
3848 u32 _port, _sktype, _type, _lower, _upper;
3849 u32 type = 0, lower = 0, upper = 0;
3856 _port = sysctl_tipc_sk_filter[0];
3857 _sktype = sysctl_tipc_sk_filter[1];
3858 _type = sysctl_tipc_sk_filter[2];
3859 _lower = sysctl_tipc_sk_filter[3];
3860 _upper = sysctl_tipc_sk_filter[4];
3862 if (!_port && !_sktype && !_type && !_lower && !_upper)
3866 return (_port == tsk->portid);
3868 if (_sktype && _sktype != sk->sk_type)
3871 if (tsk->published) {
3872 p = list_first_entry_or_null(&tsk->publications,
3873 struct publication, binding_sock);
3876 lower = p->sr.lower;
3877 upper = p->sr.upper;
3881 if (!tipc_sk_type_connectionless(sk)) {
3882 type = msg_nametype(&tsk->phdr);
3883 lower = msg_nameinst(&tsk->phdr);
3887 if ((_type && _type != type) || (_lower && _lower != lower) ||
3888 (_upper && _upper != upper))
3894 u32 tipc_sock_get_portid(struct sock *sk)
3896 return (sk) ? (tipc_sk(sk))->portid : 0;
3900 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3901 * both the rcv and backlog queues are considered
3902 * @sk: tipc sk to be checked
3903 * @skb: tipc msg to be checked
3905 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3908 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3910 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3911 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3912 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3914 return (qsize > lim * 90 / 100);
3918 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3919 * only the rcv queue is considered
3920 * @sk: tipc sk to be checked
3921 * @skb: tipc msg to be checked
3923 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3926 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3928 unsigned int lim = rcvbuf_limit(sk, skb);
3929 unsigned int qsize = sk_rmem_alloc_get(sk);
3931 return (qsize > lim * 90 / 100);
3935 * tipc_sk_dump - dump TIPC socket
3936 * @sk: tipc sk to be dumped
3937 * @dqueues: bitmask to decide if any socket queue to be dumped?
3938 * - TIPC_DUMP_NONE: don't dump socket queues
3939 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3940 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3941 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3942 * - TIPC_DUMP_ALL: dump all the socket queues above
3943 * @buf: returned buffer of dump data in format
3945 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3948 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3949 u32 conn_type, conn_instance;
3950 struct tipc_sock *tsk;
3951 struct publication *p;
3955 i += scnprintf(buf, sz, "sk data: (null)\n");
3960 tsk_connected = !tipc_sk_type_connectionless(sk);
3962 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3963 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3964 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3965 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3966 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3967 if (tsk_connected) {
3968 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3969 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3970 conn_type = msg_nametype(&tsk->phdr);
3971 conn_instance = msg_nameinst(&tsk->phdr);
3972 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3973 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3975 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3976 if (tsk->published) {
3977 p = list_first_entry_or_null(&tsk->publications,
3978 struct publication, binding_sock);
3979 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3980 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3981 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3983 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3984 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3985 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3986 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3987 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3988 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3989 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3990 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3991 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3992 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3993 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3994 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3995 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3996 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3998 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3999 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
4000 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
4003 if (dqueues & TIPC_DUMP_SK_RCVQ) {
4004 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
4005 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
4008 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4009 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4010 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4011 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4012 i += scnprintf(buf + i, sz - i, " tail ");
4013 i += tipc_skb_dump(sk->sk_backlog.tail, false,