2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/rhashtable.h>
38 #include <linux/sched/signal.h>
41 #include "name_table.h"
44 #include "name_distr.h"
50 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
51 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
52 #define TIPC_FWD_MSG 1
53 #define TIPC_MAX_PORT 0xffffffff
54 #define TIPC_MIN_PORT 1
55 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
58 TIPC_LISTEN = TCP_LISTEN,
59 TIPC_ESTABLISHED = TCP_ESTABLISHED,
60 TIPC_OPEN = TCP_CLOSE,
61 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
62 TIPC_CONNECTING = TCP_SYN_SENT,
65 struct sockaddr_pair {
66 struct sockaddr_tipc sock;
67 struct sockaddr_tipc member;
71 * struct tipc_sock - TIPC socket structure
72 * @sk: socket - interacts with 'port' and with user via the socket API
73 * @conn_type: TIPC type used when connection was established
74 * @conn_instance: TIPC instance used when connection was established
75 * @published: non-zero if port has one or more associated names
76 * @max_pkt: maximum packet size "hint" used when building messages sent by port
77 * @portid: unique port identity in TIPC socket hash table
78 * @phdr: preformatted message header used when sending messages
79 * #cong_links: list of congested links
80 * @publications: list of publications for port
81 * @blocking_link: address of the congested link we are currently sleeping on
82 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
86 * @cong_link_cnt: number of congested links
87 * @snt_unacked: # messages sent by socket, and not yet acked by peer
88 * @rcv_unacked: # messages read by user, but not yet acked back to peer
89 * @peer: 'connected' peer for dgram/rdm
90 * @node: hash table node
91 * @mc_method: cookie for use between socket and broadcast layer
92 * @rcu: rcu struct for tipc_sock
101 struct tipc_msg phdr;
102 struct list_head cong_links;
103 struct list_head publications;
106 atomic_t dupl_rcvcnt;
114 struct sockaddr_tipc peer;
115 struct rhash_head node;
116 struct tipc_mc_method mc_method;
118 struct tipc_group *group;
121 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
122 static void tipc_data_ready(struct sock *sk);
123 static void tipc_write_space(struct sock *sk);
124 static void tipc_sock_destruct(struct sock *sk);
125 static int tipc_release(struct socket *sock);
126 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
128 static void tipc_sk_timeout(struct timer_list *t);
129 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
130 struct tipc_name_seq const *seq);
131 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
132 struct tipc_name_seq const *seq);
133 static int tipc_sk_leave(struct tipc_sock *tsk);
134 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
135 static int tipc_sk_insert(struct tipc_sock *tsk);
136 static void tipc_sk_remove(struct tipc_sock *tsk);
137 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
138 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
140 static const struct proto_ops packet_ops;
141 static const struct proto_ops stream_ops;
142 static const struct proto_ops msg_ops;
143 static struct proto tipc_proto;
144 static const struct rhashtable_params tsk_rht_params;
146 static u32 tsk_own_node(struct tipc_sock *tsk)
148 return msg_prevnode(&tsk->phdr);
151 static u32 tsk_peer_node(struct tipc_sock *tsk)
153 return msg_destnode(&tsk->phdr);
156 static u32 tsk_peer_port(struct tipc_sock *tsk)
158 return msg_destport(&tsk->phdr);
161 static bool tsk_unreliable(struct tipc_sock *tsk)
163 return msg_src_droppable(&tsk->phdr) != 0;
166 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
168 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
171 static bool tsk_unreturnable(struct tipc_sock *tsk)
173 return msg_dest_droppable(&tsk->phdr) != 0;
176 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
178 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
181 static int tsk_importance(struct tipc_sock *tsk)
183 return msg_importance(&tsk->phdr);
186 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
188 if (imp > TIPC_CRITICAL_IMPORTANCE)
190 msg_set_importance(&tsk->phdr, (u32)imp);
194 static struct tipc_sock *tipc_sk(const struct sock *sk)
196 return container_of(sk, struct tipc_sock, sk);
199 static bool tsk_conn_cong(struct tipc_sock *tsk)
201 return tsk->snt_unacked > tsk->snd_win;
204 static u16 tsk_blocks(int len)
206 return ((len / FLOWCTL_BLK_SZ) + 1);
209 /* tsk_blocks(): translate a buffer size in bytes to number of
210 * advertisable blocks, taking into account the ratio truesize(len)/len
211 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
213 static u16 tsk_adv_blocks(int len)
215 return len / FLOWCTL_BLK_SZ / 4;
218 /* tsk_inc(): increment counter for sent or received data
219 * - If block based flow control is not supported by peer we
220 * fall back to message based ditto, incrementing the counter
222 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
224 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
225 return ((msglen / FLOWCTL_BLK_SZ) + 1);
230 * tsk_advance_rx_queue - discard first buffer in socket receive queue
232 * Caller must hold socket lock
234 static void tsk_advance_rx_queue(struct sock *sk)
236 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
239 /* tipc_sk_respond() : send response message back to sender
241 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
245 u32 onode = tipc_own_addr(sock_net(sk));
247 if (!tipc_msg_reverse(onode, &skb, err))
250 dnode = msg_destnode(buf_msg(skb));
251 selector = msg_origport(buf_msg(skb));
252 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
256 * tsk_rej_rx_queue - reject all buffers in socket receive queue
258 * Caller must hold socket lock
260 static void tsk_rej_rx_queue(struct sock *sk)
264 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
265 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
268 static bool tipc_sk_connected(struct sock *sk)
270 return sk->sk_state == TIPC_ESTABLISHED;
273 /* tipc_sk_type_connectionless - check if the socket is datagram socket
276 * Returns true if connection less, false otherwise
278 static bool tipc_sk_type_connectionless(struct sock *sk)
280 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
283 /* tsk_peer_msg - verify if message was sent by connected port's peer
285 * Handles cases where the node's network address has changed from
286 * the default of <0.0.0> to its configured setting.
288 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
290 struct sock *sk = &tsk->sk;
291 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
292 u32 peer_port = tsk_peer_port(tsk);
296 if (unlikely(!tipc_sk_connected(sk)))
299 if (unlikely(msg_origport(msg) != peer_port))
302 orig_node = msg_orignode(msg);
303 peer_node = tsk_peer_node(tsk);
305 if (likely(orig_node == peer_node))
308 if (!orig_node && (peer_node == tn->own_addr))
311 if (!peer_node && (orig_node == tn->own_addr))
317 /* tipc_set_sk_state - set the sk_state of the socket
320 * Caller must hold socket lock
322 * Returns 0 on success, errno otherwise
324 static int tipc_set_sk_state(struct sock *sk, int state)
326 int oldsk_state = sk->sk_state;
334 case TIPC_CONNECTING:
335 if (oldsk_state == TIPC_OPEN)
338 case TIPC_ESTABLISHED:
339 if (oldsk_state == TIPC_CONNECTING ||
340 oldsk_state == TIPC_OPEN)
343 case TIPC_DISCONNECTING:
344 if (oldsk_state == TIPC_CONNECTING ||
345 oldsk_state == TIPC_ESTABLISHED)
351 sk->sk_state = state;
356 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
358 struct sock *sk = sock->sk;
359 int err = sock_error(sk);
360 int typ = sock->type;
364 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
365 if (sk->sk_state == TIPC_DISCONNECTING)
367 else if (!tipc_sk_connected(sk))
372 if (signal_pending(current))
373 return sock_intr_errno(*timeout);
378 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
383 while ((rc_ = !(condition_))) { \
384 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
386 rc_ = tipc_sk_sock_err((sock_), timeo_); \
389 prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \
391 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
392 sched_annotate_sleep(); \
394 remove_wait_queue(sk_sleep(sk_), &wait_); \
400 * tipc_sk_create - create a TIPC socket
401 * @net: network namespace (must be default network)
402 * @sock: pre-allocated socket structure
403 * @protocol: protocol indicator (must be 0)
404 * @kern: caused by kernel or by userspace?
406 * This routine creates additional data structures used by the TIPC socket,
407 * initializes them, and links them together.
409 * Returns 0 on success, errno otherwise
411 static int tipc_sk_create(struct net *net, struct socket *sock,
412 int protocol, int kern)
415 const struct proto_ops *ops;
417 struct tipc_sock *tsk;
418 struct tipc_msg *msg;
420 /* Validate arguments */
421 if (unlikely(protocol != 0))
422 return -EPROTONOSUPPORT;
424 switch (sock->type) {
439 /* Allocate socket's protocol area */
440 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
445 tsk->max_pkt = MAX_PKT_DEFAULT;
446 INIT_LIST_HEAD(&tsk->publications);
447 INIT_LIST_HEAD(&tsk->cong_links);
449 tn = net_generic(sock_net(sk), tipc_net_id);
451 /* Finish initializing socket data structures */
453 sock_init_data(sock, sk);
454 tipc_set_sk_state(sk, TIPC_OPEN);
455 if (tipc_sk_insert(tsk)) {
456 pr_warn("Socket create failed; port number exhausted\n");
460 /* Ensure tsk is visible before we read own_addr. */
463 tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
466 msg_set_origport(msg, tsk->portid);
467 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
469 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
470 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
471 sk->sk_data_ready = tipc_data_ready;
472 sk->sk_write_space = tipc_write_space;
473 sk->sk_destruct = tipc_sock_destruct;
474 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
475 atomic_set(&tsk->dupl_rcvcnt, 0);
477 /* Start out with safe limits until we receive an advertised window */
478 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
479 tsk->rcv_win = tsk->snd_win;
481 if (tipc_sk_type_connectionless(sk)) {
482 tsk_set_unreturnable(tsk, true);
483 if (sock->type == SOCK_DGRAM)
484 tsk_set_unreliable(tsk, true);
490 static void tipc_sk_callback(struct rcu_head *head)
492 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
497 /* Caller should hold socket lock for the socket. */
498 static void __tipc_shutdown(struct socket *sock, int error)
500 struct sock *sk = sock->sk;
501 struct tipc_sock *tsk = tipc_sk(sk);
502 struct net *net = sock_net(sk);
503 long timeout = CONN_TIMEOUT_DEFAULT;
504 u32 dnode = tsk_peer_node(tsk);
507 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
508 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
509 !tsk_conn_cong(tsk)));
511 /* Reject all unreceived messages, except on an active connection
512 * (which disconnects locally & sends a 'FIN+' to peer).
514 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
515 if (TIPC_SKB_CB(skb)->bytes_read) {
519 if (!tipc_sk_type_connectionless(sk) &&
520 sk->sk_state != TIPC_DISCONNECTING) {
521 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
522 tipc_node_remove_conn(net, dnode, tsk->portid);
524 tipc_sk_respond(sk, skb, error);
527 if (tipc_sk_type_connectionless(sk))
530 if (sk->sk_state != TIPC_DISCONNECTING) {
531 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
532 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
533 tsk_own_node(tsk), tsk_peer_port(tsk),
536 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
537 tipc_node_remove_conn(net, dnode, tsk->portid);
538 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
543 * tipc_release - destroy a TIPC socket
544 * @sock: socket to destroy
546 * This routine cleans up any messages that are still queued on the socket.
547 * For DGRAM and RDM socket types, all queued messages are rejected.
548 * For SEQPACKET and STREAM socket types, the first message is rejected
549 * and any others are discarded. (If the first message on a STREAM socket
550 * is partially-read, it is discarded and the next one is rejected instead.)
552 * NOTE: Rejected messages are not necessarily returned to the sender! They
553 * are returned or discarded according to the "destination droppable" setting
554 * specified for the message by the sender.
556 * Returns 0 on success, errno otherwise
558 static int tipc_release(struct socket *sock)
560 struct sock *sk = sock->sk;
561 struct tipc_sock *tsk;
564 * Exit if socket isn't fully initialized (occurs when a failed accept()
565 * releases a pre-allocated child socket that was never used)
573 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
574 sk->sk_shutdown = SHUTDOWN_MASK;
576 tipc_sk_withdraw(tsk, 0, NULL);
577 sk_stop_timer(sk, &sk->sk_timer);
580 /* Reject any messages that accumulated in backlog queue */
582 tipc_dest_list_purge(&tsk->cong_links);
583 tsk->cong_link_cnt = 0;
584 call_rcu(&tsk->rcu, tipc_sk_callback);
591 * tipc_bind - associate or disassocate TIPC name(s) with a socket
592 * @sock: socket structure
593 * @uaddr: socket address describing name(s) and desired operation
594 * @uaddr_len: size of socket address data structure
596 * Name and name sequence binding is indicated using a positive scope value;
597 * a negative scope value unbinds the specified name. Specifying no name
598 * (i.e. a socket address length of 0) unbinds all names from the socket.
600 * Returns 0 on success, errno otherwise
602 * NOTE: This routine doesn't need to take the socket lock since it doesn't
603 * access any non-constant socket information.
605 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
608 struct sock *sk = sock->sk;
609 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
610 struct tipc_sock *tsk = tipc_sk(sk);
614 if (unlikely(!uaddr_len)) {
615 res = tipc_sk_withdraw(tsk, 0, NULL);
622 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
626 if (addr->family != AF_TIPC) {
631 if (addr->addrtype == TIPC_ADDR_NAME)
632 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
633 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
638 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
639 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
640 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
645 res = (addr->scope > 0) ?
646 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
647 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
654 * tipc_getname - get port ID of socket or peer socket
655 * @sock: socket structure
656 * @uaddr: area for returned socket address
657 * @uaddr_len: area for returned length of socket address
658 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
660 * Returns 0 on success, errno otherwise
662 * NOTE: This routine doesn't need to take the socket lock since it only
663 * accesses socket information that is unchanging (or which changes in
664 * a completely predictable manner).
666 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
667 int *uaddr_len, int peer)
669 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
670 struct sock *sk = sock->sk;
671 struct tipc_sock *tsk = tipc_sk(sk);
672 struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
674 memset(addr, 0, sizeof(*addr));
676 if ((!tipc_sk_connected(sk)) &&
677 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
679 addr->addr.id.ref = tsk_peer_port(tsk);
680 addr->addr.id.node = tsk_peer_node(tsk);
682 addr->addr.id.ref = tsk->portid;
683 addr->addr.id.node = tn->own_addr;
686 *uaddr_len = sizeof(*addr);
687 addr->addrtype = TIPC_ADDR_ID;
688 addr->family = AF_TIPC;
690 addr->addr.name.domain = 0;
696 * tipc_poll - read and possibly block on pollmask
697 * @file: file structure associated with the socket
698 * @sock: socket for which to calculate the poll bits
701 * Returns pollmask value
704 * It appears that the usual socket locking mechanisms are not useful here
705 * since the pollmask info is potentially out-of-date the moment this routine
706 * exits. TCP and other protocols seem to rely on higher level poll routines
707 * to handle any preventable race conditions, so TIPC will do the same ...
709 * IMPORTANT: The fact that a read or write operation is indicated does NOT
710 * imply that the operation will succeed, merely that it should be performed
711 * and will not block.
713 static unsigned int tipc_poll(struct file *file, struct socket *sock,
716 struct sock *sk = sock->sk;
717 struct tipc_sock *tsk = tipc_sk(sk);
718 struct tipc_group *grp = tsk->group;
721 sock_poll_wait(file, sk_sleep(sk), wait);
723 if (sk->sk_shutdown & RCV_SHUTDOWN)
724 revents |= POLLRDHUP | POLLIN | POLLRDNORM;
725 if (sk->sk_shutdown == SHUTDOWN_MASK)
728 switch (sk->sk_state) {
729 case TIPC_ESTABLISHED:
730 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
734 case TIPC_CONNECTING:
735 if (!skb_queue_empty(&sk->sk_receive_queue))
736 revents |= POLLIN | POLLRDNORM;
739 if (!grp || tipc_group_size(grp))
740 if (!tsk->cong_link_cnt)
742 if (!tipc_sk_type_connectionless(sk))
744 if (skb_queue_empty(&sk->sk_receive_queue))
746 revents |= POLLIN | POLLRDNORM;
748 case TIPC_DISCONNECTING:
749 revents = POLLIN | POLLRDNORM | POLLHUP;
756 * tipc_sendmcast - send multicast message
757 * @sock: socket structure
758 * @seq: destination address
759 * @msg: message to send
760 * @dlen: length of data to send
761 * @timeout: timeout to wait for wakeup
763 * Called from function tipc_sendmsg(), which has done all sanity checks
764 * Returns the number of bytes sent on success, or errno
766 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
767 struct msghdr *msg, size_t dlen, long timeout)
769 struct sock *sk = sock->sk;
770 struct tipc_sock *tsk = tipc_sk(sk);
771 struct tipc_msg *hdr = &tsk->phdr;
772 struct net *net = sock_net(sk);
773 int mtu = tipc_bcast_get_mtu(net);
774 struct tipc_mc_method *method = &tsk->mc_method;
775 u32 domain = addr_domain(net, TIPC_CLUSTER_SCOPE);
776 struct sk_buff_head pkts;
777 struct tipc_nlist dsts;
783 /* Block or return if any destination link is congested */
784 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
788 /* Lookup destination nodes */
789 tipc_nlist_init(&dsts, tipc_own_addr(net));
790 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
791 seq->upper, domain, &dsts);
792 if (!dsts.local && !dsts.remote)
793 return -EHOSTUNREACH;
795 /* Build message header */
796 msg_set_type(hdr, TIPC_MCAST_MSG);
797 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
798 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
799 msg_set_destport(hdr, 0);
800 msg_set_destnode(hdr, 0);
801 msg_set_nametype(hdr, seq->type);
802 msg_set_namelower(hdr, seq->lower);
803 msg_set_nameupper(hdr, seq->upper);
805 /* Build message as chain of buffers */
806 skb_queue_head_init(&pkts);
807 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
809 /* Send message if build was successful */
810 if (unlikely(rc == dlen))
811 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
812 &tsk->cong_link_cnt);
814 tipc_nlist_purge(&dsts);
816 return rc ? rc : dlen;
820 * tipc_send_group_msg - send a message to a member in the group
821 * @net: network namespace
822 * @m: message to send
824 * @dnode: destination node
825 * @dport: destination port
826 * @dlen: total length of message data
828 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
829 struct msghdr *m, struct tipc_member *mb,
830 u32 dnode, u32 dport, int dlen)
832 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
833 struct tipc_mc_method *method = &tsk->mc_method;
834 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
835 struct tipc_msg *hdr = &tsk->phdr;
836 struct sk_buff_head pkts;
839 /* Complete message header */
840 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
841 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
842 msg_set_destport(hdr, dport);
843 msg_set_destnode(hdr, dnode);
844 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
846 /* Build message as chain of buffers */
847 skb_queue_head_init(&pkts);
848 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
849 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
850 if (unlikely(rc != dlen))
854 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
855 if (unlikely(rc == -ELINKCONG)) {
856 tipc_dest_push(&tsk->cong_links, dnode, 0);
857 tsk->cong_link_cnt++;
860 /* Update send window */
861 tipc_group_update_member(mb, blks);
863 /* A broadcast sent within next EXPIRE period must follow same path */
864 method->rcast = true;
865 method->mandatory = true;
870 * tipc_send_group_unicast - send message to a member in the group
871 * @sock: socket structure
872 * @m: message to send
873 * @dlen: total length of message data
874 * @timeout: timeout to wait for wakeup
876 * Called from function tipc_sendmsg(), which has done all sanity checks
877 * Returns the number of bytes sent on success, or errno
879 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
880 int dlen, long timeout)
882 struct sock *sk = sock->sk;
883 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
884 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
885 struct tipc_sock *tsk = tipc_sk(sk);
886 struct tipc_group *grp = tsk->group;
887 struct net *net = sock_net(sk);
888 struct tipc_member *mb = NULL;
892 node = dest->addr.id.node;
893 port = dest->addr.id.ref;
895 return -EHOSTUNREACH;
897 /* Block or return if destination link or member is congested */
898 rc = tipc_wait_for_cond(sock, &timeout,
899 !tipc_dest_find(&tsk->cong_links, node, 0) &&
900 !tipc_group_cong(grp, node, port, blks, &mb));
905 return -EHOSTUNREACH;
907 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
909 return rc ? rc : dlen;
913 * tipc_send_group_anycast - send message to any member with given identity
914 * @sock: socket structure
915 * @m: message to send
916 * @dlen: total length of message data
917 * @timeout: timeout to wait for wakeup
919 * Called from function tipc_sendmsg(), which has done all sanity checks
920 * Returns the number of bytes sent on success, or errno
922 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
923 int dlen, long timeout)
925 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
926 struct sock *sk = sock->sk;
927 struct tipc_sock *tsk = tipc_sk(sk);
928 struct list_head *cong_links = &tsk->cong_links;
929 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
930 struct tipc_group *grp = tsk->group;
931 struct tipc_member *first = NULL;
932 struct tipc_member *mbr = NULL;
933 struct net *net = sock_net(sk);
934 u32 node, port, exclude;
935 u32 type, inst, domain;
936 struct list_head dsts;
941 INIT_LIST_HEAD(&dsts);
943 type = dest->addr.name.name.type;
944 inst = dest->addr.name.name.instance;
945 domain = addr_domain(net, dest->scope);
946 exclude = tipc_group_exclude(grp);
948 while (++lookups < 4) {
951 /* Look for a non-congested destination member, if any */
953 if (!tipc_nametbl_lookup(net, type, inst, domain, &dsts,
954 &dstcnt, exclude, false))
955 return -EHOSTUNREACH;
956 tipc_dest_pop(&dsts, &node, &port);
957 cong = tipc_group_cong(grp, node, port, blks, &mbr);
966 /* Start over if destination was not in member list */
970 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
973 /* Block or return if destination link or member is congested */
974 rc = tipc_wait_for_cond(sock, &timeout,
975 !tipc_dest_find(cong_links, node, 0) &&
976 !tipc_group_cong(grp, node, port,
981 /* Send, unless destination disappeared while waiting */
986 if (unlikely(lookups >= 4))
987 return -EHOSTUNREACH;
989 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
991 return rc ? rc : dlen;
995 * tipc_send_group_bcast - send message to all members in communication group
996 * @sk: socket structure
997 * @m: message to send
998 * @dlen: total length of message data
999 * @timeout: timeout to wait for wakeup
1001 * Called from function tipc_sendmsg(), which has done all sanity checks
1002 * Returns the number of bytes sent on success, or errno
1004 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1005 int dlen, long timeout)
1007 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1008 struct sock *sk = sock->sk;
1009 struct net *net = sock_net(sk);
1010 struct tipc_sock *tsk = tipc_sk(sk);
1011 struct tipc_group *grp = tsk->group;
1012 struct tipc_nlist *dsts = tipc_group_dests(grp);
1013 struct tipc_mc_method *method = &tsk->mc_method;
1014 bool ack = method->mandatory && method->rcast;
1015 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1016 struct tipc_msg *hdr = &tsk->phdr;
1017 int mtu = tipc_bcast_get_mtu(net);
1018 struct sk_buff_head pkts;
1019 int rc = -EHOSTUNREACH;
1021 if (!dsts->local && !dsts->remote)
1022 return -EHOSTUNREACH;
1024 /* Block or return if any destination link or member is congested */
1025 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt &&
1026 !tipc_group_bc_cong(grp, blks));
1030 /* Complete message header */
1032 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1033 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1035 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1036 msg_set_nameinst(hdr, 0);
1038 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1039 msg_set_destport(hdr, 0);
1040 msg_set_destnode(hdr, 0);
1041 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(grp));
1043 /* Avoid getting stuck with repeated forced replicasts */
1044 msg_set_grp_bc_ack_req(hdr, ack);
1046 /* Build message as chain of buffers */
1047 skb_queue_head_init(&pkts);
1048 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1049 if (unlikely(rc != dlen))
1053 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1057 /* Update broadcast sequence number and send windows */
1058 tipc_group_update_bc_members(tsk->group, blks, ack);
1060 /* Broadcast link is now free to choose method for next broadcast */
1061 method->mandatory = false;
1062 method->expires = jiffies;
1068 * tipc_send_group_mcast - send message to all members with given identity
1069 * @sock: socket structure
1070 * @m: message to send
1071 * @dlen: total length of message data
1072 * @timeout: timeout to wait for wakeup
1074 * Called from function tipc_sendmsg(), which has done all sanity checks
1075 * Returns the number of bytes sent on success, or errno
1077 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1078 int dlen, long timeout)
1080 struct sock *sk = sock->sk;
1081 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1082 struct tipc_name_seq *seq = &dest->addr.nameseq;
1083 struct tipc_sock *tsk = tipc_sk(sk);
1084 struct tipc_group *grp = tsk->group;
1085 struct net *net = sock_net(sk);
1086 u32 domain, exclude, dstcnt;
1087 struct list_head dsts;
1089 INIT_LIST_HEAD(&dsts);
1091 if (seq->lower != seq->upper)
1094 domain = addr_domain(net, dest->scope);
1095 exclude = tipc_group_exclude(grp);
1096 if (!tipc_nametbl_lookup(net, seq->type, seq->lower, domain,
1097 &dsts, &dstcnt, exclude, true))
1098 return -EHOSTUNREACH;
1101 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1102 return tipc_send_group_unicast(sock, m, dlen, timeout);
1105 tipc_dest_list_purge(&dsts);
1106 return tipc_send_group_bcast(sock, m, dlen, timeout);
1110 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1111 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1112 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1114 * Multi-threaded: parallel calls with reference to same queues may occur
1116 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1117 struct sk_buff_head *inputq)
1119 u32 scope = TIPC_CLUSTER_SCOPE;
1120 u32 self = tipc_own_addr(net);
1121 struct sk_buff *skb, *_skb;
1122 u32 lower = 0, upper = ~0;
1123 struct sk_buff_head tmpq;
1124 u32 portid, oport, onode;
1125 struct list_head dports;
1126 struct tipc_msg *msg;
1127 int user, mtyp, hsz;
1129 __skb_queue_head_init(&tmpq);
1130 INIT_LIST_HEAD(&dports);
1132 skb = tipc_skb_peek(arrvq, &inputq->lock);
1133 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1135 user = msg_user(msg);
1136 mtyp = msg_type(msg);
1137 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1138 spin_lock_bh(&inputq->lock);
1139 if (skb_peek(arrvq) == skb) {
1140 __skb_dequeue(arrvq);
1141 __skb_queue_tail(inputq, skb);
1144 spin_unlock_bh(&inputq->lock);
1147 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
1148 oport = msg_origport(msg);
1149 onode = msg_orignode(msg);
1151 scope = TIPC_NODE_SCOPE;
1153 /* Create destination port list and message clones: */
1154 if (!msg_in_group(msg)) {
1155 lower = msg_namelower(msg);
1156 upper = msg_nameupper(msg);
1158 tipc_nametbl_mc_translate(net, msg_nametype(msg), lower, upper,
1160 while (tipc_dest_pop(&dports, NULL, &portid)) {
1161 _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
1163 msg_set_destport(buf_msg(_skb), portid);
1164 __skb_queue_tail(&tmpq, _skb);
1167 pr_warn("Failed to clone mcast rcv buffer\n");
1169 /* Append to inputq if not already done by other thread */
1170 spin_lock_bh(&inputq->lock);
1171 if (skb_peek(arrvq) == skb) {
1172 skb_queue_splice_tail_init(&tmpq, inputq);
1173 kfree_skb(__skb_dequeue(arrvq));
1175 spin_unlock_bh(&inputq->lock);
1176 __skb_queue_purge(&tmpq);
1179 tipc_sk_rcv(net, inputq);
1183 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1184 * @tsk: receiving socket
1185 * @skb: pointer to message buffer.
1187 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1188 struct sk_buff_head *xmitq)
1190 struct tipc_msg *hdr = buf_msg(skb);
1191 u32 onode = tsk_own_node(tsk);
1192 struct sock *sk = &tsk->sk;
1193 int mtyp = msg_type(hdr);
1196 /* Ignore if connection cannot be validated: */
1197 if (!tsk_peer_msg(tsk, hdr))
1200 if (unlikely(msg_errcode(hdr))) {
1201 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1202 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1203 tsk_peer_port(tsk));
1204 sk->sk_state_change(sk);
1208 tsk->probe_unacked = false;
1210 if (mtyp == CONN_PROBE) {
1211 msg_set_type(hdr, CONN_PROBE_REPLY);
1212 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1213 __skb_queue_tail(xmitq, skb);
1215 } else if (mtyp == CONN_ACK) {
1216 conn_cong = tsk_conn_cong(tsk);
1217 tsk->snt_unacked -= msg_conn_ack(hdr);
1218 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1219 tsk->snd_win = msg_adv_win(hdr);
1221 sk->sk_write_space(sk);
1222 } else if (mtyp != CONN_PROBE_REPLY) {
1223 pr_warn("Received unknown CONN_PROTO msg\n");
1230 * tipc_sendmsg - send message in connectionless manner
1231 * @sock: socket structure
1232 * @m: message to send
1233 * @dsz: amount of user data to be sent
1235 * Message must have an destination specified explicitly.
1236 * Used for SOCK_RDM and SOCK_DGRAM messages,
1237 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1238 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1240 * Returns the number of bytes sent on success, or errno otherwise
1242 static int tipc_sendmsg(struct socket *sock,
1243 struct msghdr *m, size_t dsz)
1245 struct sock *sk = sock->sk;
1249 ret = __tipc_sendmsg(sock, m, dsz);
1255 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1257 struct sock *sk = sock->sk;
1258 struct net *net = sock_net(sk);
1259 struct tipc_sock *tsk = tipc_sk(sk);
1260 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1261 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1262 struct list_head *clinks = &tsk->cong_links;
1263 bool syn = !tipc_sk_type_connectionless(sk);
1264 struct tipc_group *grp = tsk->group;
1265 struct tipc_msg *hdr = &tsk->phdr;
1266 struct tipc_name_seq *seq;
1267 struct sk_buff_head pkts;
1268 u32 type, inst, domain;
1272 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1276 if (unlikely(m->msg_namelen < sizeof(*dest)))
1278 if (unlikely(dest->family != AF_TIPC))
1284 return tipc_send_group_bcast(sock, m, dlen, timeout);
1285 if (dest->addrtype == TIPC_ADDR_NAME)
1286 return tipc_send_group_anycast(sock, m, dlen, timeout);
1287 if (dest->addrtype == TIPC_ADDR_ID)
1288 return tipc_send_group_unicast(sock, m, dlen, timeout);
1289 if (dest->addrtype == TIPC_ADDR_MCAST)
1290 return tipc_send_group_mcast(sock, m, dlen, timeout);
1294 if (unlikely(!dest)) {
1296 if (!syn || dest->family != AF_TIPC)
1297 return -EDESTADDRREQ;
1300 if (unlikely(syn)) {
1301 if (sk->sk_state == TIPC_LISTEN)
1303 if (sk->sk_state != TIPC_OPEN)
1307 if (dest->addrtype == TIPC_ADDR_NAME) {
1308 tsk->conn_type = dest->addr.name.name.type;
1309 tsk->conn_instance = dest->addr.name.name.instance;
1313 seq = &dest->addr.nameseq;
1314 if (dest->addrtype == TIPC_ADDR_MCAST)
1315 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1317 if (dest->addrtype == TIPC_ADDR_NAME) {
1318 type = dest->addr.name.name.type;
1319 inst = dest->addr.name.name.instance;
1320 domain = dest->addr.name.domain;
1322 msg_set_type(hdr, TIPC_NAMED_MSG);
1323 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1324 msg_set_nametype(hdr, type);
1325 msg_set_nameinst(hdr, inst);
1326 msg_set_lookup_scope(hdr, tipc_addr_scope(domain));
1327 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1328 msg_set_destnode(hdr, dnode);
1329 msg_set_destport(hdr, dport);
1330 if (unlikely(!dport && !dnode))
1331 return -EHOSTUNREACH;
1332 } else if (dest->addrtype == TIPC_ADDR_ID) {
1333 dnode = dest->addr.id.node;
1334 msg_set_type(hdr, TIPC_DIRECT_MSG);
1335 msg_set_lookup_scope(hdr, 0);
1336 msg_set_destnode(hdr, dnode);
1337 msg_set_destport(hdr, dest->addr.id.ref);
1338 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1341 /* Block or return if destination link is congested */
1342 rc = tipc_wait_for_cond(sock, &timeout,
1343 !tipc_dest_find(clinks, dnode, 0));
1347 skb_queue_head_init(&pkts);
1348 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
1349 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1350 if (unlikely(rc != dlen))
1353 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1354 if (unlikely(rc == -ELINKCONG)) {
1355 tipc_dest_push(clinks, dnode, 0);
1356 tsk->cong_link_cnt++;
1360 if (unlikely(syn && !rc))
1361 tipc_set_sk_state(sk, TIPC_CONNECTING);
1363 return rc ? rc : dlen;
1367 * tipc_sendstream - send stream-oriented data
1368 * @sock: socket structure
1370 * @dsz: total length of data to be transmitted
1372 * Used for SOCK_STREAM data.
1374 * Returns the number of bytes sent on success (or partial success),
1375 * or errno if no data sent
1377 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1379 struct sock *sk = sock->sk;
1383 ret = __tipc_sendstream(sock, m, dsz);
1389 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1391 struct sock *sk = sock->sk;
1392 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1393 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1394 struct tipc_sock *tsk = tipc_sk(sk);
1395 struct tipc_msg *hdr = &tsk->phdr;
1396 struct net *net = sock_net(sk);
1397 struct sk_buff_head pkts;
1398 u32 dnode = tsk_peer_node(tsk);
1402 skb_queue_head_init(&pkts);
1404 if (unlikely(dlen > INT_MAX))
1407 /* Handle implicit connection setup */
1408 if (unlikely(dest)) {
1409 rc = __tipc_sendmsg(sock, m, dlen);
1410 if (dlen && (dlen == rc))
1411 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1416 rc = tipc_wait_for_cond(sock, &timeout,
1417 (!tsk->cong_link_cnt &&
1418 !tsk_conn_cong(tsk) &&
1419 tipc_sk_connected(sk)));
1423 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1424 rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
1425 if (unlikely(rc != send))
1428 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1429 if (unlikely(rc == -ELINKCONG)) {
1430 tsk->cong_link_cnt = 1;
1434 tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
1437 } while (sent < dlen && !rc);
1439 return sent ? sent : rc;
1443 * tipc_send_packet - send a connection-oriented message
1444 * @sock: socket structure
1445 * @m: message to send
1446 * @dsz: length of data to be transmitted
1448 * Used for SOCK_SEQPACKET messages.
1450 * Returns the number of bytes sent on success, or errno otherwise
1452 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1454 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1457 return tipc_sendstream(sock, m, dsz);
1460 /* tipc_sk_finish_conn - complete the setup of a connection
1462 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1465 struct sock *sk = &tsk->sk;
1466 struct net *net = sock_net(sk);
1467 struct tipc_msg *msg = &tsk->phdr;
1469 msg_set_destnode(msg, peer_node);
1470 msg_set_destport(msg, peer_port);
1471 msg_set_type(msg, TIPC_CONN_MSG);
1472 msg_set_lookup_scope(msg, 0);
1473 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1475 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1476 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1477 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1478 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1479 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1480 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1483 /* Fall back to message based flow control */
1484 tsk->rcv_win = FLOWCTL_MSG_WIN;
1485 tsk->snd_win = FLOWCTL_MSG_WIN;
1489 * tipc_sk_set_orig_addr - capture sender's address for received message
1490 * @m: descriptor for message info
1491 * @hdr: received message header
1493 * Note: Address is not captured if not requested by receiver.
1495 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1497 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1498 struct tipc_msg *hdr = buf_msg(skb);
1503 srcaddr->sock.family = AF_TIPC;
1504 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1505 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1506 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1507 srcaddr->sock.addr.name.domain = 0;
1508 srcaddr->sock.scope = 0;
1509 m->msg_namelen = sizeof(struct sockaddr_tipc);
1511 if (!msg_in_group(hdr))
1514 /* Group message users may also want to know sending member's id */
1515 srcaddr->member.family = AF_TIPC;
1516 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1517 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1518 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1519 srcaddr->member.addr.name.domain = 0;
1520 m->msg_namelen = sizeof(*srcaddr);
1524 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1525 * @m: descriptor for message info
1526 * @msg: received message header
1527 * @tsk: TIPC port associated with message
1529 * Note: Ancillary data is not captured if not requested by receiver.
1531 * Returns 0 if successful, otherwise errno
1533 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1534 struct tipc_sock *tsk)
1542 if (likely(m->msg_controllen == 0))
1545 /* Optionally capture errored message object(s) */
1546 err = msg ? msg_errcode(msg) : 0;
1547 if (unlikely(err)) {
1549 anc_data[1] = msg_data_sz(msg);
1550 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1554 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1561 /* Optionally capture message destination object */
1562 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1563 switch (dest_type) {
1564 case TIPC_NAMED_MSG:
1566 anc_data[0] = msg_nametype(msg);
1567 anc_data[1] = msg_namelower(msg);
1568 anc_data[2] = msg_namelower(msg);
1570 case TIPC_MCAST_MSG:
1572 anc_data[0] = msg_nametype(msg);
1573 anc_data[1] = msg_namelower(msg);
1574 anc_data[2] = msg_nameupper(msg);
1577 has_name = (tsk->conn_type != 0);
1578 anc_data[0] = tsk->conn_type;
1579 anc_data[1] = tsk->conn_instance;
1580 anc_data[2] = tsk->conn_instance;
1586 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1594 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1596 struct sock *sk = &tsk->sk;
1597 struct net *net = sock_net(sk);
1598 struct sk_buff *skb = NULL;
1599 struct tipc_msg *msg;
1600 u32 peer_port = tsk_peer_port(tsk);
1601 u32 dnode = tsk_peer_node(tsk);
1603 if (!tipc_sk_connected(sk))
1605 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1606 dnode, tsk_own_node(tsk), peer_port,
1607 tsk->portid, TIPC_OK);
1611 msg_set_conn_ack(msg, tsk->rcv_unacked);
1612 tsk->rcv_unacked = 0;
1614 /* Adjust to and advertize the correct window limit */
1615 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1616 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1617 msg_set_adv_win(msg, tsk->rcv_win);
1619 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1622 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1624 struct sock *sk = sock->sk;
1626 long timeo = *timeop;
1627 int err = sock_error(sk);
1633 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1634 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1635 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1640 timeo = schedule_timeout(timeo);
1644 if (!skb_queue_empty(&sk->sk_receive_queue))
1649 err = sock_intr_errno(timeo);
1650 if (signal_pending(current))
1653 err = sock_error(sk);
1657 finish_wait(sk_sleep(sk), &wait);
1663 * tipc_recvmsg - receive packet-oriented message
1664 * @m: descriptor for message info
1665 * @buflen: length of user buffer area
1666 * @flags: receive flags
1668 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1669 * If the complete message doesn't fit in user area, truncate it.
1671 * Returns size of returned message data, errno otherwise
1673 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1674 size_t buflen, int flags)
1676 struct sock *sk = sock->sk;
1677 bool connected = !tipc_sk_type_connectionless(sk);
1678 struct tipc_sock *tsk = tipc_sk(sk);
1679 int rc, err, hlen, dlen, copy;
1680 struct sk_buff_head xmitq;
1681 struct tipc_msg *hdr;
1682 struct sk_buff *skb;
1686 /* Catch invalid receive requests */
1687 if (unlikely(!buflen))
1691 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1695 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1697 /* Step rcv queue to first msg with data or error; wait if necessary */
1699 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1702 skb = skb_peek(&sk->sk_receive_queue);
1704 dlen = msg_data_sz(hdr);
1705 hlen = msg_hdr_sz(hdr);
1706 err = msg_errcode(hdr);
1707 grp_evt = msg_is_grp_evt(hdr);
1708 if (likely(dlen || err))
1710 tsk_advance_rx_queue(sk);
1713 /* Collect msg meta data, including error code and rejected data */
1714 tipc_sk_set_orig_addr(m, skb);
1715 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1719 /* Capture data if non-error msg, otherwise just set return value */
1721 copy = min_t(int, dlen, buflen);
1722 if (unlikely(copy != dlen))
1723 m->msg_flags |= MSG_TRUNC;
1724 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1728 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1734 /* Mark message as group event if applicable */
1735 if (unlikely(grp_evt)) {
1736 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1737 m->msg_flags |= MSG_EOR;
1738 m->msg_flags |= MSG_OOB;
1742 /* Caption of data or error code/rejected data was successful */
1743 if (unlikely(flags & MSG_PEEK))
1746 /* Send group flow control advertisement when applicable */
1747 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1748 skb_queue_head_init(&xmitq);
1749 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1750 msg_orignode(hdr), msg_origport(hdr),
1752 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1755 tsk_advance_rx_queue(sk);
1757 if (likely(!connected))
1760 /* Send connection flow control advertisement when applicable */
1761 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1762 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1763 tipc_sk_send_ack(tsk);
1766 return rc ? rc : copy;
1770 * tipc_recvstream - receive stream-oriented data
1771 * @m: descriptor for message info
1772 * @buflen: total size of user buffer area
1773 * @flags: receive flags
1775 * Used for SOCK_STREAM messages only. If not enough data is available
1776 * will optionally wait for more; never truncates data.
1778 * Returns size of returned message data, errno otherwise
1780 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1781 size_t buflen, int flags)
1783 struct sock *sk = sock->sk;
1784 struct tipc_sock *tsk = tipc_sk(sk);
1785 struct sk_buff *skb;
1786 struct tipc_msg *hdr;
1787 struct tipc_skb_cb *skb_cb;
1788 bool peek = flags & MSG_PEEK;
1789 int offset, required, copy, copied = 0;
1790 int hlen, dlen, err, rc;
1793 /* Catch invalid receive attempts */
1794 if (unlikely(!buflen))
1799 if (unlikely(sk->sk_state == TIPC_OPEN)) {
1803 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
1804 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1807 /* Look at first msg in receive queue; wait if necessary */
1808 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1811 skb = skb_peek(&sk->sk_receive_queue);
1812 skb_cb = TIPC_SKB_CB(skb);
1814 dlen = msg_data_sz(hdr);
1815 hlen = msg_hdr_sz(hdr);
1816 err = msg_errcode(hdr);
1818 /* Discard any empty non-errored (SYN-) message */
1819 if (unlikely(!dlen && !err)) {
1820 tsk_advance_rx_queue(sk);
1824 /* Collect msg meta data, incl. error code and rejected data */
1826 tipc_sk_set_orig_addr(m, skb);
1827 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1832 /* Copy data if msg ok, otherwise return error/partial data */
1834 offset = skb_cb->bytes_read;
1835 copy = min_t(int, dlen - offset, buflen - copied);
1836 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1841 if (unlikely(offset < dlen)) {
1843 skb_cb->bytes_read = offset;
1848 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
1857 tsk_advance_rx_queue(sk);
1859 /* Send connection flow control advertisement when applicable */
1860 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1861 if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
1862 tipc_sk_send_ack(tsk);
1864 /* Exit if all requested data or FIN/error received */
1865 if (copied == buflen || err)
1868 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
1871 return copied ? copied : rc;
1875 * tipc_write_space - wake up thread if port congestion is released
1878 static void tipc_write_space(struct sock *sk)
1880 struct socket_wq *wq;
1883 wq = rcu_dereference(sk->sk_wq);
1884 if (skwq_has_sleeper(wq))
1885 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1886 POLLWRNORM | POLLWRBAND);
1891 * tipc_data_ready - wake up threads to indicate messages have been received
1893 * @len: the length of messages
1895 static void tipc_data_ready(struct sock *sk)
1897 struct socket_wq *wq;
1900 wq = rcu_dereference(sk->sk_wq);
1901 if (skwq_has_sleeper(wq))
1902 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1903 POLLRDNORM | POLLRDBAND);
1907 static void tipc_sock_destruct(struct sock *sk)
1909 __skb_queue_purge(&sk->sk_receive_queue);
1912 static void tipc_sk_proto_rcv(struct sock *sk,
1913 struct sk_buff_head *inputq,
1914 struct sk_buff_head *xmitq)
1916 struct sk_buff *skb = __skb_dequeue(inputq);
1917 struct tipc_sock *tsk = tipc_sk(sk);
1918 struct tipc_msg *hdr = buf_msg(skb);
1919 struct tipc_group *grp = tsk->group;
1920 bool wakeup = false;
1922 switch (msg_user(hdr)) {
1924 tipc_sk_conn_proto_rcv(tsk, skb, xmitq);
1927 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
1928 tsk->cong_link_cnt--;
1931 case GROUP_PROTOCOL:
1932 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
1935 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
1936 skb, inputq, xmitq);
1944 sk->sk_write_space(sk);
1950 * tipc_filter_connect - Handle incoming message for a connection-based socket
1952 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1954 * Returns true if everything ok, false otherwise
1956 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
1958 struct sock *sk = &tsk->sk;
1959 struct net *net = sock_net(sk);
1960 struct tipc_msg *hdr = buf_msg(skb);
1961 u32 pport = msg_origport(hdr);
1962 u32 pnode = msg_orignode(hdr);
1964 if (unlikely(msg_mcast(hdr)))
1967 switch (sk->sk_state) {
1968 case TIPC_CONNECTING:
1969 /* Accept only ACK or NACK message */
1970 if (unlikely(!msg_connected(hdr))) {
1971 if (pport != tsk_peer_port(tsk) ||
1972 pnode != tsk_peer_node(tsk))
1975 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1976 sk->sk_err = ECONNREFUSED;
1977 sk->sk_state_change(sk);
1981 if (unlikely(msg_errcode(hdr))) {
1982 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1983 sk->sk_err = ECONNREFUSED;
1984 sk->sk_state_change(sk);
1988 if (unlikely(!msg_isdata(hdr))) {
1989 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1990 sk->sk_err = EINVAL;
1991 sk->sk_state_change(sk);
1995 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
1996 msg_set_importance(&tsk->phdr, msg_importance(hdr));
1998 /* If 'ACK+' message, add to socket receive queue */
1999 if (msg_data_sz(hdr))
2002 /* If empty 'ACK-' message, wake up sleeping connect() */
2003 sk->sk_data_ready(sk);
2005 /* 'ACK-' message is neither accepted nor rejected: */
2006 msg_set_dest_droppable(hdr, 1);
2010 case TIPC_DISCONNECTING:
2013 /* Accept only SYN message */
2014 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
2017 case TIPC_ESTABLISHED:
2018 /* Accept only connection-based messages sent by peer */
2019 if (unlikely(!tsk_peer_msg(tsk, hdr)))
2022 if (unlikely(msg_errcode(hdr))) {
2023 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2024 /* Let timer expire on it's own */
2025 tipc_node_remove_conn(net, tsk_peer_node(tsk),
2027 sk->sk_state_change(sk);
2031 pr_err("Unknown sk_state %u\n", sk->sk_state);
2038 * rcvbuf_limit - get proper overload limit of socket receive queue
2042 * For connection oriented messages, irrespective of importance,
2043 * default queue limit is 2 MB.
2045 * For connectionless messages, queue limits are based on message
2046 * importance as follows:
2048 * TIPC_LOW_IMPORTANCE (2 MB)
2049 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2050 * TIPC_HIGH_IMPORTANCE (8 MB)
2051 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2053 * Returns overload limit according to corresponding message importance
2055 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2057 struct tipc_sock *tsk = tipc_sk(sk);
2058 struct tipc_msg *hdr = buf_msg(skb);
2060 if (unlikely(msg_in_group(hdr)))
2061 return sk->sk_rcvbuf;
2063 if (unlikely(!msg_connected(hdr)))
2064 return sk->sk_rcvbuf << msg_importance(hdr);
2066 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2067 return sk->sk_rcvbuf;
2069 return FLOWCTL_MSG_LIM;
2073 * tipc_sk_filter_rcv - validate incoming message
2075 * @skb: pointer to message.
2077 * Enqueues message on receive queue if acceptable; optionally handles
2078 * disconnect indication for a connected socket.
2080 * Called with socket lock already taken
2083 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2084 struct sk_buff_head *xmitq)
2086 bool sk_conn = !tipc_sk_type_connectionless(sk);
2087 struct tipc_sock *tsk = tipc_sk(sk);
2088 struct tipc_group *grp = tsk->group;
2089 struct tipc_msg *hdr = buf_msg(skb);
2090 struct net *net = sock_net(sk);
2091 struct sk_buff_head inputq;
2092 int limit, err = TIPC_OK;
2094 TIPC_SKB_CB(skb)->bytes_read = 0;
2095 __skb_queue_head_init(&inputq);
2096 __skb_queue_tail(&inputq, skb);
2098 if (unlikely(!msg_isdata(hdr)))
2099 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2102 tipc_group_filter_msg(grp, &inputq, xmitq);
2104 /* Validate and add to receive buffer if there is space */
2105 while ((skb = __skb_dequeue(&inputq))) {
2107 limit = rcvbuf_limit(sk, skb);
2108 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
2109 (!sk_conn && msg_connected(hdr)) ||
2110 (!grp && msg_in_group(hdr)))
2111 err = TIPC_ERR_NO_PORT;
2112 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit)
2113 err = TIPC_ERR_OVERLOAD;
2115 if (unlikely(err)) {
2116 tipc_skb_reject(net, err, skb, xmitq);
2120 __skb_queue_tail(&sk->sk_receive_queue, skb);
2121 skb_set_owner_r(skb, sk);
2122 sk->sk_data_ready(sk);
2127 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2131 * Caller must hold socket lock
2133 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2135 unsigned int before = sk_rmem_alloc_get(sk);
2136 struct sk_buff_head xmitq;
2139 __skb_queue_head_init(&xmitq);
2141 tipc_sk_filter_rcv(sk, skb, &xmitq);
2142 added = sk_rmem_alloc_get(sk) - before;
2143 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2145 /* Send pending response/rejected messages, if any */
2146 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2151 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2152 * inputq and try adding them to socket or backlog queue
2153 * @inputq: list of incoming buffers with potentially different destinations
2154 * @sk: socket where the buffers should be enqueued
2155 * @dport: port number for the socket
2157 * Caller must hold socket lock
2159 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2160 u32 dport, struct sk_buff_head *xmitq)
2162 unsigned long time_limit = jiffies + 2;
2163 struct sk_buff *skb;
2168 while (skb_queue_len(inputq)) {
2169 if (unlikely(time_after_eq(jiffies, time_limit)))
2172 skb = tipc_skb_dequeue(inputq, dport);
2176 /* Add message directly to receive queue if possible */
2177 if (!sock_owned_by_user(sk)) {
2178 tipc_sk_filter_rcv(sk, skb, xmitq);
2182 /* Try backlog, compensating for double-counted bytes */
2183 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2184 if (!sk->sk_backlog.len)
2185 atomic_set(dcnt, 0);
2186 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2187 if (likely(!sk_add_backlog(sk, skb, lim)))
2190 /* Overload => reject message back to sender */
2191 onode = tipc_own_addr(sock_net(sk));
2192 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
2193 __skb_queue_tail(xmitq, skb);
2199 * tipc_sk_rcv - handle a chain of incoming buffers
2200 * @inputq: buffer list containing the buffers
2201 * Consumes all buffers in list until inputq is empty
2202 * Note: may be called in multiple threads referring to the same queue
2204 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2206 struct sk_buff_head xmitq;
2207 u32 dnode, dport = 0;
2209 struct tipc_sock *tsk;
2211 struct sk_buff *skb;
2213 __skb_queue_head_init(&xmitq);
2214 while (skb_queue_len(inputq)) {
2215 dport = tipc_skb_peek_port(inputq, dport);
2216 tsk = tipc_sk_lookup(net, dport);
2220 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2221 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2222 spin_unlock_bh(&sk->sk_lock.slock);
2224 /* Send pending response/rejected messages, if any */
2225 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2229 /* No destination socket => dequeue skb if still there */
2230 skb = tipc_skb_dequeue(inputq, dport);
2234 /* Try secondary lookup if unresolved named message */
2235 err = TIPC_ERR_NO_PORT;
2236 if (tipc_msg_lookup_dest(net, skb, &err))
2239 /* Prepare for message rejection */
2240 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2243 dnode = msg_destnode(buf_msg(skb));
2244 tipc_node_xmit_skb(net, skb, dnode, dport);
2248 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2250 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2251 struct sock *sk = sock->sk;
2255 int err = sock_error(sk);
2260 if (signal_pending(current))
2261 return sock_intr_errno(*timeo_p);
2263 add_wait_queue(sk_sleep(sk), &wait);
2264 done = sk_wait_event(sk, timeo_p,
2265 sk->sk_state != TIPC_CONNECTING, &wait);
2266 remove_wait_queue(sk_sleep(sk), &wait);
2272 * tipc_connect - establish a connection to another TIPC port
2273 * @sock: socket structure
2274 * @dest: socket address for destination port
2275 * @destlen: size of socket address data structure
2276 * @flags: file-related flags associated with socket
2278 * Returns 0 on success, errno otherwise
2280 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2281 int destlen, int flags)
2283 struct sock *sk = sock->sk;
2284 struct tipc_sock *tsk = tipc_sk(sk);
2285 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2286 struct msghdr m = {NULL,};
2287 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2291 if (destlen != sizeof(struct sockaddr_tipc))
2301 if (dst->family == AF_UNSPEC) {
2302 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2303 if (!tipc_sk_type_connectionless(sk))
2306 } else if (dst->family != AF_TIPC) {
2309 if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME)
2314 /* DGRAM/RDM connect(), just save the destaddr */
2315 if (tipc_sk_type_connectionless(sk)) {
2316 memcpy(&tsk->peer, dest, destlen);
2320 previous = sk->sk_state;
2322 switch (sk->sk_state) {
2324 /* Send a 'SYN-' to destination */
2326 m.msg_namelen = destlen;
2328 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2329 * indicate send_msg() is never blocked.
2332 m.msg_flags = MSG_DONTWAIT;
2334 res = __tipc_sendmsg(sock, &m, 0);
2335 if ((res < 0) && (res != -EWOULDBLOCK))
2338 /* Just entered TIPC_CONNECTING state; the only
2339 * difference is that return value in non-blocking
2340 * case is EINPROGRESS, rather than EALREADY.
2344 case TIPC_CONNECTING:
2346 if (previous == TIPC_CONNECTING)
2350 timeout = msecs_to_jiffies(timeout);
2351 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2352 res = tipc_wait_for_connect(sock, &timeout);
2354 case TIPC_ESTABLISHED:
2367 * tipc_listen - allow socket to listen for incoming connections
2368 * @sock: socket structure
2371 * Returns 0 on success, errno otherwise
2373 static int tipc_listen(struct socket *sock, int len)
2375 struct sock *sk = sock->sk;
2379 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2385 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2387 struct sock *sk = sock->sk;
2391 /* True wake-one mechanism for incoming connections: only
2392 * one process gets woken up, not the 'whole herd'.
2393 * Since we do not 'race & poll' for established sockets
2394 * anymore, the common case will execute the loop only once.
2397 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2398 TASK_INTERRUPTIBLE);
2399 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2401 timeo = schedule_timeout(timeo);
2405 if (!skb_queue_empty(&sk->sk_receive_queue))
2410 err = sock_intr_errno(timeo);
2411 if (signal_pending(current))
2414 finish_wait(sk_sleep(sk), &wait);
2419 * tipc_accept - wait for connection request
2420 * @sock: listening socket
2421 * @newsock: new socket that is to be connected
2422 * @flags: file-related flags associated with socket
2424 * Returns 0 on success, errno otherwise
2426 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2429 struct sock *new_sk, *sk = sock->sk;
2430 struct sk_buff *buf;
2431 struct tipc_sock *new_tsock;
2432 struct tipc_msg *msg;
2438 if (sk->sk_state != TIPC_LISTEN) {
2442 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2443 res = tipc_wait_for_accept(sock, timeo);
2447 buf = skb_peek(&sk->sk_receive_queue);
2449 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2452 security_sk_clone(sock->sk, new_sock->sk);
2454 new_sk = new_sock->sk;
2455 new_tsock = tipc_sk(new_sk);
2458 /* we lock on new_sk; but lockdep sees the lock on sk */
2459 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2462 * Reject any stray messages received by new socket
2463 * before the socket lock was taken (very, very unlikely)
2465 tsk_rej_rx_queue(new_sk);
2467 /* Connect new socket to it's peer */
2468 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2470 tsk_set_importance(new_tsock, msg_importance(msg));
2471 if (msg_named(msg)) {
2472 new_tsock->conn_type = msg_nametype(msg);
2473 new_tsock->conn_instance = msg_nameinst(msg);
2477 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2478 * Respond to 'SYN+' by queuing it on new socket.
2480 if (!msg_data_sz(msg)) {
2481 struct msghdr m = {NULL,};
2483 tsk_advance_rx_queue(sk);
2484 __tipc_sendstream(new_sock, &m, 0);
2486 __skb_dequeue(&sk->sk_receive_queue);
2487 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2488 skb_set_owner_r(buf, new_sk);
2490 release_sock(new_sk);
2497 * tipc_shutdown - shutdown socket connection
2498 * @sock: socket structure
2499 * @how: direction to close (must be SHUT_RDWR)
2501 * Terminates connection (if necessary), then purges socket's receive queue.
2503 * Returns 0 on success, errno otherwise
2505 static int tipc_shutdown(struct socket *sock, int how)
2507 struct sock *sk = sock->sk;
2510 if (how != SHUT_RDWR)
2515 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2516 sk->sk_shutdown = SEND_SHUTDOWN;
2518 if (sk->sk_state == TIPC_DISCONNECTING) {
2519 /* Discard any unreceived messages */
2520 __skb_queue_purge(&sk->sk_receive_queue);
2522 /* Wake up anyone sleeping in poll */
2523 sk->sk_state_change(sk);
2533 static void tipc_sk_timeout(struct timer_list *t)
2535 struct sock *sk = from_timer(sk, t, sk_timer);
2536 struct tipc_sock *tsk = tipc_sk(sk);
2537 u32 peer_port = tsk_peer_port(tsk);
2538 u32 peer_node = tsk_peer_node(tsk);
2539 u32 own_node = tsk_own_node(tsk);
2540 u32 own_port = tsk->portid;
2541 struct net *net = sock_net(sk);
2542 struct sk_buff *skb = NULL;
2545 if (!tipc_sk_connected(sk))
2548 /* Try again later if socket is busy */
2549 if (sock_owned_by_user(sk)) {
2550 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2554 if (tsk->probe_unacked) {
2555 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2556 tipc_node_remove_conn(net, peer_node, peer_port);
2557 sk->sk_state_change(sk);
2560 /* Send new probe */
2561 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2562 peer_node, own_node, peer_port, own_port,
2564 tsk->probe_unacked = true;
2565 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2569 tipc_node_xmit_skb(net, skb, peer_node, own_port);
2573 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2574 struct tipc_name_seq const *seq)
2576 struct sock *sk = &tsk->sk;
2577 struct net *net = sock_net(sk);
2578 struct publication *publ;
2581 if (tipc_sk_connected(sk))
2583 key = tsk->portid + tsk->pub_count + 1;
2584 if (key == tsk->portid)
2587 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2588 scope, tsk->portid, key);
2589 if (unlikely(!publ))
2592 list_add(&publ->pport_list, &tsk->publications);
2598 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2599 struct tipc_name_seq const *seq)
2601 struct net *net = sock_net(&tsk->sk);
2602 struct publication *publ;
2603 struct publication *safe;
2606 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2608 if (publ->scope != scope)
2610 if (publ->type != seq->type)
2612 if (publ->lower != seq->lower)
2614 if (publ->upper != seq->upper)
2616 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2617 publ->ref, publ->key);
2621 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2622 publ->ref, publ->key);
2625 if (list_empty(&tsk->publications))
2630 /* tipc_sk_reinit: set non-zero address in all existing sockets
2631 * when we go from standalone to network mode.
2633 void tipc_sk_reinit(struct net *net)
2635 struct tipc_net *tn = net_generic(net, tipc_net_id);
2636 struct rhashtable_iter iter;
2637 struct tipc_sock *tsk;
2638 struct tipc_msg *msg;
2640 rhashtable_walk_enter(&tn->sk_rht, &iter);
2643 tsk = ERR_PTR(rhashtable_walk_start(&iter));
2647 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2648 spin_lock_bh(&tsk->sk.sk_lock.slock);
2650 msg_set_prevnode(msg, tn->own_addr);
2651 msg_set_orignode(msg, tn->own_addr);
2652 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2655 rhashtable_walk_stop(&iter);
2656 } while (tsk == ERR_PTR(-EAGAIN));
2659 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2661 struct tipc_net *tn = net_generic(net, tipc_net_id);
2662 struct tipc_sock *tsk;
2665 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2667 sock_hold(&tsk->sk);
2673 static int tipc_sk_insert(struct tipc_sock *tsk)
2675 struct sock *sk = &tsk->sk;
2676 struct net *net = sock_net(sk);
2677 struct tipc_net *tn = net_generic(net, tipc_net_id);
2678 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2679 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2681 while (remaining--) {
2683 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2684 portid = TIPC_MIN_PORT;
2685 tsk->portid = portid;
2686 sock_hold(&tsk->sk);
2687 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2696 static void tipc_sk_remove(struct tipc_sock *tsk)
2698 struct sock *sk = &tsk->sk;
2699 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2701 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2702 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
2707 static const struct rhashtable_params tsk_rht_params = {
2709 .head_offset = offsetof(struct tipc_sock, node),
2710 .key_offset = offsetof(struct tipc_sock, portid),
2711 .key_len = sizeof(u32), /* portid */
2712 .max_size = 1048576,
2714 .automatic_shrinking = true,
2717 int tipc_sk_rht_init(struct net *net)
2719 struct tipc_net *tn = net_generic(net, tipc_net_id);
2721 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2724 void tipc_sk_rht_destroy(struct net *net)
2726 struct tipc_net *tn = net_generic(net, tipc_net_id);
2728 /* Wait for socket readers to complete */
2731 rhashtable_destroy(&tn->sk_rht);
2734 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
2736 struct net *net = sock_net(&tsk->sk);
2737 u32 domain = addr_domain(net, mreq->scope);
2738 struct tipc_group *grp = tsk->group;
2739 struct tipc_msg *hdr = &tsk->phdr;
2740 struct tipc_name_seq seq;
2743 if (mreq->type < TIPC_RESERVED_TYPES)
2747 grp = tipc_group_create(net, tsk->portid, mreq);
2751 msg_set_lookup_scope(hdr, mreq->scope);
2752 msg_set_nametype(hdr, mreq->type);
2753 msg_set_dest_droppable(hdr, true);
2754 seq.type = mreq->type;
2755 seq.lower = mreq->instance;
2756 seq.upper = seq.lower;
2757 tipc_nametbl_build_group(net, grp, mreq->type, domain);
2758 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
2760 tipc_group_delete(net, grp);
2764 /* Eliminate any risk that a broadcast overtakes the sent JOIN */
2765 tsk->mc_method.rcast = true;
2766 tsk->mc_method.mandatory = true;
2770 static int tipc_sk_leave(struct tipc_sock *tsk)
2772 struct net *net = sock_net(&tsk->sk);
2773 struct tipc_group *grp = tsk->group;
2774 struct tipc_name_seq seq;
2779 tipc_group_self(grp, &seq, &scope);
2780 tipc_group_delete(net, grp);
2782 tipc_sk_withdraw(tsk, scope, &seq);
2787 * tipc_setsockopt - set socket option
2788 * @sock: socket structure
2789 * @lvl: option level
2790 * @opt: option identifier
2791 * @ov: pointer to new option value
2792 * @ol: length of option value
2794 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2795 * (to ease compatibility).
2797 * Returns 0 on success, errno otherwise
2799 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2800 char __user *ov, unsigned int ol)
2802 struct sock *sk = sock->sk;
2803 struct tipc_sock *tsk = tipc_sk(sk);
2804 struct tipc_group_req mreq;
2808 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2810 if (lvl != SOL_TIPC)
2811 return -ENOPROTOOPT;
2814 case TIPC_IMPORTANCE:
2815 case TIPC_SRC_DROPPABLE:
2816 case TIPC_DEST_DROPPABLE:
2817 case TIPC_CONN_TIMEOUT:
2818 if (ol < sizeof(value))
2820 if (get_user(value, (u32 __user *)ov))
2823 case TIPC_GROUP_JOIN:
2824 if (ol < sizeof(mreq))
2826 if (copy_from_user(&mreq, ov, sizeof(mreq)))
2837 case TIPC_IMPORTANCE:
2838 res = tsk_set_importance(tsk, value);
2840 case TIPC_SRC_DROPPABLE:
2841 if (sock->type != SOCK_STREAM)
2842 tsk_set_unreliable(tsk, value);
2846 case TIPC_DEST_DROPPABLE:
2847 tsk_set_unreturnable(tsk, value);
2849 case TIPC_CONN_TIMEOUT:
2850 tipc_sk(sk)->conn_timeout = value;
2852 case TIPC_MCAST_BROADCAST:
2853 tsk->mc_method.rcast = false;
2854 tsk->mc_method.mandatory = true;
2856 case TIPC_MCAST_REPLICAST:
2857 tsk->mc_method.rcast = true;
2858 tsk->mc_method.mandatory = true;
2860 case TIPC_GROUP_JOIN:
2861 res = tipc_sk_join(tsk, &mreq);
2863 case TIPC_GROUP_LEAVE:
2864 res = tipc_sk_leave(tsk);
2876 * tipc_getsockopt - get socket option
2877 * @sock: socket structure
2878 * @lvl: option level
2879 * @opt: option identifier
2880 * @ov: receptacle for option value
2881 * @ol: receptacle for length of option value
2883 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2884 * (to ease compatibility).
2886 * Returns 0 on success, errno otherwise
2888 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2889 char __user *ov, int __user *ol)
2891 struct sock *sk = sock->sk;
2892 struct tipc_sock *tsk = tipc_sk(sk);
2893 struct tipc_name_seq seq;
2898 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2899 return put_user(0, ol);
2900 if (lvl != SOL_TIPC)
2901 return -ENOPROTOOPT;
2902 res = get_user(len, ol);
2909 case TIPC_IMPORTANCE:
2910 value = tsk_importance(tsk);
2912 case TIPC_SRC_DROPPABLE:
2913 value = tsk_unreliable(tsk);
2915 case TIPC_DEST_DROPPABLE:
2916 value = tsk_unreturnable(tsk);
2918 case TIPC_CONN_TIMEOUT:
2919 value = tsk->conn_timeout;
2920 /* no need to set "res", since already 0 at this point */
2922 case TIPC_NODE_RECVQ_DEPTH:
2923 value = 0; /* was tipc_queue_size, now obsolete */
2925 case TIPC_SOCK_RECVQ_DEPTH:
2926 value = skb_queue_len(&sk->sk_receive_queue);
2928 case TIPC_GROUP_JOIN:
2931 tipc_group_self(tsk->group, &seq, &scope);
2941 return res; /* "get" failed */
2943 if (len < sizeof(value))
2946 if (copy_to_user(ov, &value, sizeof(value)))
2949 return put_user(sizeof(value), ol);
2952 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2954 struct sock *sk = sock->sk;
2955 struct tipc_sioc_ln_req lnr;
2956 void __user *argp = (void __user *)arg;
2959 case SIOCGETLINKNAME:
2960 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2962 if (!tipc_node_get_linkname(sock_net(sk),
2963 lnr.bearer_id & 0xffff, lnr.peer,
2964 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2965 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2969 return -EADDRNOTAVAIL;
2971 return -ENOIOCTLCMD;
2975 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
2977 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
2978 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
2979 u32 onode = tipc_own_addr(sock_net(sock1->sk));
2981 tsk1->peer.family = AF_TIPC;
2982 tsk1->peer.addrtype = TIPC_ADDR_ID;
2983 tsk1->peer.scope = TIPC_NODE_SCOPE;
2984 tsk1->peer.addr.id.ref = tsk2->portid;
2985 tsk1->peer.addr.id.node = onode;
2986 tsk2->peer.family = AF_TIPC;
2987 tsk2->peer.addrtype = TIPC_ADDR_ID;
2988 tsk2->peer.scope = TIPC_NODE_SCOPE;
2989 tsk2->peer.addr.id.ref = tsk1->portid;
2990 tsk2->peer.addr.id.node = onode;
2992 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
2993 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
2997 /* Protocol switches for the various types of TIPC sockets */
2999 static const struct proto_ops msg_ops = {
3000 .owner = THIS_MODULE,
3002 .release = tipc_release,
3004 .connect = tipc_connect,
3005 .socketpair = tipc_socketpair,
3006 .accept = sock_no_accept,
3007 .getname = tipc_getname,
3009 .ioctl = tipc_ioctl,
3010 .listen = sock_no_listen,
3011 .shutdown = tipc_shutdown,
3012 .setsockopt = tipc_setsockopt,
3013 .getsockopt = tipc_getsockopt,
3014 .sendmsg = tipc_sendmsg,
3015 .recvmsg = tipc_recvmsg,
3016 .mmap = sock_no_mmap,
3017 .sendpage = sock_no_sendpage
3020 static const struct proto_ops packet_ops = {
3021 .owner = THIS_MODULE,
3023 .release = tipc_release,
3025 .connect = tipc_connect,
3026 .socketpair = tipc_socketpair,
3027 .accept = tipc_accept,
3028 .getname = tipc_getname,
3030 .ioctl = tipc_ioctl,
3031 .listen = tipc_listen,
3032 .shutdown = tipc_shutdown,
3033 .setsockopt = tipc_setsockopt,
3034 .getsockopt = tipc_getsockopt,
3035 .sendmsg = tipc_send_packet,
3036 .recvmsg = tipc_recvmsg,
3037 .mmap = sock_no_mmap,
3038 .sendpage = sock_no_sendpage
3041 static const struct proto_ops stream_ops = {
3042 .owner = THIS_MODULE,
3044 .release = tipc_release,
3046 .connect = tipc_connect,
3047 .socketpair = tipc_socketpair,
3048 .accept = tipc_accept,
3049 .getname = tipc_getname,
3051 .ioctl = tipc_ioctl,
3052 .listen = tipc_listen,
3053 .shutdown = tipc_shutdown,
3054 .setsockopt = tipc_setsockopt,
3055 .getsockopt = tipc_getsockopt,
3056 .sendmsg = tipc_sendstream,
3057 .recvmsg = tipc_recvstream,
3058 .mmap = sock_no_mmap,
3059 .sendpage = sock_no_sendpage
3062 static const struct net_proto_family tipc_family_ops = {
3063 .owner = THIS_MODULE,
3065 .create = tipc_sk_create
3068 static struct proto tipc_proto = {
3070 .owner = THIS_MODULE,
3071 .obj_size = sizeof(struct tipc_sock),
3072 .sysctl_rmem = sysctl_tipc_rmem
3076 * tipc_socket_init - initialize TIPC socket interface
3078 * Returns 0 on success, errno otherwise
3080 int tipc_socket_init(void)
3084 res = proto_register(&tipc_proto, 1);
3086 pr_err("Failed to register TIPC protocol type\n");
3090 res = sock_register(&tipc_family_ops);
3092 pr_err("Failed to register TIPC socket type\n");
3093 proto_unregister(&tipc_proto);
3101 * tipc_socket_stop - stop TIPC socket interface
3103 void tipc_socket_stop(void)
3105 sock_unregister(tipc_family_ops.family);
3106 proto_unregister(&tipc_proto);
3109 /* Caller should hold socket lock for the passed tipc socket. */
3110 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3114 struct nlattr *nest;
3116 peer_node = tsk_peer_node(tsk);
3117 peer_port = tsk_peer_port(tsk);
3119 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
3121 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3123 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3126 if (tsk->conn_type != 0) {
3127 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3129 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3131 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3134 nla_nest_end(skb, nest);
3139 nla_nest_cancel(skb, nest);
3144 /* Caller should hold socket lock for the passed tipc socket. */
3145 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3146 struct tipc_sock *tsk)
3150 struct nlattr *attrs;
3151 struct net *net = sock_net(skb->sk);
3152 struct tipc_net *tn = net_generic(net, tipc_net_id);
3153 struct sock *sk = &tsk->sk;
3155 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3156 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3160 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
3162 goto genlmsg_cancel;
3163 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
3164 goto attr_msg_cancel;
3165 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
3166 goto attr_msg_cancel;
3168 if (tipc_sk_connected(sk)) {
3169 err = __tipc_nl_add_sk_con(skb, tsk);
3171 goto attr_msg_cancel;
3172 } else if (!list_empty(&tsk->publications)) {
3173 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3174 goto attr_msg_cancel;
3176 nla_nest_end(skb, attrs);
3177 genlmsg_end(skb, hdr);
3182 nla_nest_cancel(skb, attrs);
3184 genlmsg_cancel(skb, hdr);
3189 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3192 struct tipc_sock *tsk;
3193 const struct bucket_table *tbl;
3194 struct rhash_head *pos;
3195 struct net *net = sock_net(skb->sk);
3196 struct tipc_net *tn = net_generic(net, tipc_net_id);
3197 u32 tbl_id = cb->args[0];
3198 u32 prev_portid = cb->args[1];
3201 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
3202 for (; tbl_id < tbl->size; tbl_id++) {
3203 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
3204 spin_lock_bh(&tsk->sk.sk_lock.slock);
3205 if (prev_portid && prev_portid != tsk->portid) {
3206 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3210 err = __tipc_nl_add_sk(skb, cb, tsk);
3212 prev_portid = tsk->portid;
3213 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3217 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3222 cb->args[0] = tbl_id;
3223 cb->args[1] = prev_portid;
3228 /* Caller should hold socket lock for the passed tipc socket. */
3229 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3230 struct netlink_callback *cb,
3231 struct publication *publ)
3234 struct nlattr *attrs;
3236 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3237 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3241 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
3243 goto genlmsg_cancel;
3245 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3246 goto attr_msg_cancel;
3247 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3248 goto attr_msg_cancel;
3249 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3250 goto attr_msg_cancel;
3251 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3252 goto attr_msg_cancel;
3254 nla_nest_end(skb, attrs);
3255 genlmsg_end(skb, hdr);
3260 nla_nest_cancel(skb, attrs);
3262 genlmsg_cancel(skb, hdr);
3267 /* Caller should hold socket lock for the passed tipc socket. */
3268 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3269 struct netlink_callback *cb,
3270 struct tipc_sock *tsk, u32 *last_publ)
3273 struct publication *p;
3276 list_for_each_entry(p, &tsk->publications, pport_list) {
3277 if (p->key == *last_publ)
3280 if (p->key != *last_publ) {
3281 /* We never set seq or call nl_dump_check_consistent()
3282 * this means that setting prev_seq here will cause the
3283 * consistence check to fail in the netlink callback
3284 * handler. Resulting in the last NLMSG_DONE message
3285 * having the NLM_F_DUMP_INTR flag set.
3292 p = list_first_entry(&tsk->publications, struct publication,
3296 list_for_each_entry_from(p, &tsk->publications, pport_list) {
3297 err = __tipc_nl_add_sk_publ(skb, cb, p);
3299 *last_publ = p->key;
3308 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3311 u32 tsk_portid = cb->args[0];
3312 u32 last_publ = cb->args[1];
3313 u32 done = cb->args[2];
3314 struct net *net = sock_net(skb->sk);
3315 struct tipc_sock *tsk;
3318 struct nlattr **attrs;
3319 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3321 err = tipc_nlmsg_parse(cb->nlh, &attrs);
3325 if (!attrs[TIPC_NLA_SOCK])
3328 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
3329 attrs[TIPC_NLA_SOCK],
3330 tipc_nl_sock_policy, NULL);
3334 if (!sock[TIPC_NLA_SOCK_REF])
3337 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3343 tsk = tipc_sk_lookup(net, tsk_portid);
3347 lock_sock(&tsk->sk);
3348 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3351 release_sock(&tsk->sk);
3354 cb->args[0] = tsk_portid;
3355 cb->args[1] = last_publ;