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;
122 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
123 static void tipc_data_ready(struct sock *sk);
124 static void tipc_write_space(struct sock *sk);
125 static void tipc_sock_destruct(struct sock *sk);
126 static int tipc_release(struct socket *sock);
127 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
129 static void tipc_sk_timeout(struct timer_list *t);
130 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
131 struct tipc_name_seq const *seq);
132 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
133 struct tipc_name_seq const *seq);
134 static int tipc_sk_leave(struct tipc_sock *tsk);
135 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
136 static int tipc_sk_insert(struct tipc_sock *tsk);
137 static void tipc_sk_remove(struct tipc_sock *tsk);
138 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
139 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
141 static const struct proto_ops packet_ops;
142 static const struct proto_ops stream_ops;
143 static const struct proto_ops msg_ops;
144 static struct proto tipc_proto;
145 static const struct rhashtable_params tsk_rht_params;
147 static u32 tsk_own_node(struct tipc_sock *tsk)
149 return msg_prevnode(&tsk->phdr);
152 static u32 tsk_peer_node(struct tipc_sock *tsk)
154 return msg_destnode(&tsk->phdr);
157 static u32 tsk_peer_port(struct tipc_sock *tsk)
159 return msg_destport(&tsk->phdr);
162 static bool tsk_unreliable(struct tipc_sock *tsk)
164 return msg_src_droppable(&tsk->phdr) != 0;
167 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
169 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
172 static bool tsk_unreturnable(struct tipc_sock *tsk)
174 return msg_dest_droppable(&tsk->phdr) != 0;
177 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
179 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
182 static int tsk_importance(struct tipc_sock *tsk)
184 return msg_importance(&tsk->phdr);
187 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
189 if (imp > TIPC_CRITICAL_IMPORTANCE)
191 msg_set_importance(&tsk->phdr, (u32)imp);
195 static struct tipc_sock *tipc_sk(const struct sock *sk)
197 return container_of(sk, struct tipc_sock, sk);
200 static bool tsk_conn_cong(struct tipc_sock *tsk)
202 return tsk->snt_unacked > tsk->snd_win;
205 static u16 tsk_blocks(int len)
207 return ((len / FLOWCTL_BLK_SZ) + 1);
210 /* tsk_blocks(): translate a buffer size in bytes to number of
211 * advertisable blocks, taking into account the ratio truesize(len)/len
212 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
214 static u16 tsk_adv_blocks(int len)
216 return len / FLOWCTL_BLK_SZ / 4;
219 /* tsk_inc(): increment counter for sent or received data
220 * - If block based flow control is not supported by peer we
221 * fall back to message based ditto, incrementing the counter
223 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
225 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
226 return ((msglen / FLOWCTL_BLK_SZ) + 1);
231 * tsk_advance_rx_queue - discard first buffer in socket receive queue
233 * Caller must hold socket lock
235 static void tsk_advance_rx_queue(struct sock *sk)
237 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
240 /* tipc_sk_respond() : send response message back to sender
242 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
246 u32 onode = tipc_own_addr(sock_net(sk));
248 if (!tipc_msg_reverse(onode, &skb, err))
251 dnode = msg_destnode(buf_msg(skb));
252 selector = msg_origport(buf_msg(skb));
253 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
257 * tsk_rej_rx_queue - reject all buffers in socket receive queue
259 * Caller must hold socket lock
261 static void tsk_rej_rx_queue(struct sock *sk)
265 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
266 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
269 static bool tipc_sk_connected(struct sock *sk)
271 return sk->sk_state == TIPC_ESTABLISHED;
274 /* tipc_sk_type_connectionless - check if the socket is datagram socket
277 * Returns true if connection less, false otherwise
279 static bool tipc_sk_type_connectionless(struct sock *sk)
281 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
284 /* tsk_peer_msg - verify if message was sent by connected port's peer
286 * Handles cases where the node's network address has changed from
287 * the default of <0.0.0> to its configured setting.
289 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
291 struct sock *sk = &tsk->sk;
292 u32 self = tipc_own_addr(sock_net(sk));
293 u32 peer_port = tsk_peer_port(tsk);
294 u32 orig_node, peer_node;
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 == self)
311 if (!peer_node && orig_node == self)
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)
414 const struct proto_ops *ops;
416 struct tipc_sock *tsk;
417 struct tipc_msg *msg;
419 /* Validate arguments */
420 if (unlikely(protocol != 0))
421 return -EPROTONOSUPPORT;
423 switch (sock->type) {
438 /* Allocate socket's protocol area */
439 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
444 tsk->max_pkt = MAX_PKT_DEFAULT;
445 INIT_LIST_HEAD(&tsk->publications);
446 INIT_LIST_HEAD(&tsk->cong_links);
449 /* Finish initializing socket data structures */
451 sock_init_data(sock, sk);
452 tipc_set_sk_state(sk, TIPC_OPEN);
453 if (tipc_sk_insert(tsk)) {
454 pr_warn("Socket create failed; port number exhausted\n");
458 /* Ensure tsk is visible before we read own_addr. */
461 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
462 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
464 msg_set_origport(msg, tsk->portid);
465 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
467 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
468 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
469 sk->sk_data_ready = tipc_data_ready;
470 sk->sk_write_space = tipc_write_space;
471 sk->sk_destruct = tipc_sock_destruct;
472 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
473 tsk->group_is_open = true;
474 atomic_set(&tsk->dupl_rcvcnt, 0);
476 /* Start out with safe limits until we receive an advertised window */
477 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
478 tsk->rcv_win = tsk->snd_win;
480 if (tipc_sk_type_connectionless(sk)) {
481 tsk_set_unreturnable(tsk, true);
482 if (sock->type == SOCK_DGRAM)
483 tsk_set_unreliable(tsk, true);
489 static void tipc_sk_callback(struct rcu_head *head)
491 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
496 /* Caller should hold socket lock for the socket. */
497 static void __tipc_shutdown(struct socket *sock, int error)
499 struct sock *sk = sock->sk;
500 struct tipc_sock *tsk = tipc_sk(sk);
501 struct net *net = sock_net(sk);
502 long timeout = CONN_TIMEOUT_DEFAULT;
503 u32 dnode = tsk_peer_node(tsk);
506 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
507 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
508 !tsk_conn_cong(tsk)));
510 /* Reject all unreceived messages, except on an active connection
511 * (which disconnects locally & sends a 'FIN+' to peer).
513 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
514 if (TIPC_SKB_CB(skb)->bytes_read) {
518 if (!tipc_sk_type_connectionless(sk) &&
519 sk->sk_state != TIPC_DISCONNECTING) {
520 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
521 tipc_node_remove_conn(net, dnode, tsk->portid);
523 tipc_sk_respond(sk, skb, error);
526 if (tipc_sk_type_connectionless(sk))
529 if (sk->sk_state != TIPC_DISCONNECTING) {
530 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
531 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
532 tsk_own_node(tsk), tsk_peer_port(tsk),
535 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
536 tipc_node_remove_conn(net, dnode, tsk->portid);
537 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
542 * tipc_release - destroy a TIPC socket
543 * @sock: socket to destroy
545 * This routine cleans up any messages that are still queued on the socket.
546 * For DGRAM and RDM socket types, all queued messages are rejected.
547 * For SEQPACKET and STREAM socket types, the first message is rejected
548 * and any others are discarded. (If the first message on a STREAM socket
549 * is partially-read, it is discarded and the next one is rejected instead.)
551 * NOTE: Rejected messages are not necessarily returned to the sender! They
552 * are returned or discarded according to the "destination droppable" setting
553 * specified for the message by the sender.
555 * Returns 0 on success, errno otherwise
557 static int tipc_release(struct socket *sock)
559 struct sock *sk = sock->sk;
560 struct tipc_sock *tsk;
563 * Exit if socket isn't fully initialized (occurs when a failed accept()
564 * releases a pre-allocated child socket that was never used)
572 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
573 sk->sk_shutdown = SHUTDOWN_MASK;
575 tipc_sk_withdraw(tsk, 0, NULL);
576 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,
669 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
670 struct sock *sk = sock->sk;
671 struct tipc_sock *tsk = tipc_sk(sk);
673 memset(addr, 0, sizeof(*addr));
675 if ((!tipc_sk_connected(sk)) &&
676 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
678 addr->addr.id.ref = tsk_peer_port(tsk);
679 addr->addr.id.node = tsk_peer_node(tsk);
681 addr->addr.id.ref = tsk->portid;
682 addr->addr.id.node = tipc_own_addr(sock_net(sk));
685 addr->addrtype = TIPC_ADDR_ID;
686 addr->family = AF_TIPC;
688 addr->addr.name.domain = 0;
690 return sizeof(*addr);
694 * tipc_poll - read and possibly block on pollmask
695 * @file: file structure associated with the socket
696 * @sock: socket for which to calculate the poll bits
699 * Returns pollmask value
702 * It appears that the usual socket locking mechanisms are not useful here
703 * since the pollmask info is potentially out-of-date the moment this routine
704 * exits. TCP and other protocols seem to rely on higher level poll routines
705 * to handle any preventable race conditions, so TIPC will do the same ...
707 * IMPORTANT: The fact that a read or write operation is indicated does NOT
708 * imply that the operation will succeed, merely that it should be performed
709 * and will not block.
711 static __poll_t tipc_poll(struct file *file, struct socket *sock,
714 struct sock *sk = sock->sk;
715 struct tipc_sock *tsk = tipc_sk(sk);
716 __poll_t revents = 0;
718 sock_poll_wait(file, wait);
720 if (sk->sk_shutdown & RCV_SHUTDOWN)
721 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
722 if (sk->sk_shutdown == SHUTDOWN_MASK)
725 switch (sk->sk_state) {
726 case TIPC_ESTABLISHED:
727 case TIPC_CONNECTING:
728 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
732 if (!skb_queue_empty(&sk->sk_receive_queue))
733 revents |= EPOLLIN | EPOLLRDNORM;
736 if (tsk->group_is_open && !tsk->cong_link_cnt)
738 if (!tipc_sk_type_connectionless(sk))
740 if (skb_queue_empty(&sk->sk_receive_queue))
742 revents |= EPOLLIN | EPOLLRDNORM;
744 case TIPC_DISCONNECTING:
745 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
752 * tipc_sendmcast - send multicast message
753 * @sock: socket structure
754 * @seq: destination address
755 * @msg: message to send
756 * @dlen: length of data to send
757 * @timeout: timeout to wait for wakeup
759 * Called from function tipc_sendmsg(), which has done all sanity checks
760 * Returns the number of bytes sent on success, or errno
762 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
763 struct msghdr *msg, size_t dlen, long timeout)
765 struct sock *sk = sock->sk;
766 struct tipc_sock *tsk = tipc_sk(sk);
767 struct tipc_msg *hdr = &tsk->phdr;
768 struct net *net = sock_net(sk);
769 int mtu = tipc_bcast_get_mtu(net);
770 struct tipc_mc_method *method = &tsk->mc_method;
771 struct sk_buff_head pkts;
772 struct tipc_nlist dsts;
778 /* Block or return if any destination link is congested */
779 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
783 /* Lookup destination nodes */
784 tipc_nlist_init(&dsts, tipc_own_addr(net));
785 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
787 if (!dsts.local && !dsts.remote)
788 return -EHOSTUNREACH;
790 /* Build message header */
791 msg_set_type(hdr, TIPC_MCAST_MSG);
792 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
793 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
794 msg_set_destport(hdr, 0);
795 msg_set_destnode(hdr, 0);
796 msg_set_nametype(hdr, seq->type);
797 msg_set_namelower(hdr, seq->lower);
798 msg_set_nameupper(hdr, seq->upper);
800 /* Build message as chain of buffers */
801 skb_queue_head_init(&pkts);
802 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
804 /* Send message if build was successful */
805 if (unlikely(rc == dlen))
806 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
807 &tsk->cong_link_cnt);
809 tipc_nlist_purge(&dsts);
811 return rc ? rc : dlen;
815 * tipc_send_group_msg - send a message to a member in the group
816 * @net: network namespace
817 * @m: message to send
819 * @dnode: destination node
820 * @dport: destination port
821 * @dlen: total length of message data
823 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
824 struct msghdr *m, struct tipc_member *mb,
825 u32 dnode, u32 dport, int dlen)
827 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
828 struct tipc_mc_method *method = &tsk->mc_method;
829 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
830 struct tipc_msg *hdr = &tsk->phdr;
831 struct sk_buff_head pkts;
834 /* Complete message header */
835 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
836 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
837 msg_set_destport(hdr, dport);
838 msg_set_destnode(hdr, dnode);
839 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
841 /* Build message as chain of buffers */
842 skb_queue_head_init(&pkts);
843 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
844 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
845 if (unlikely(rc != dlen))
849 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
850 if (unlikely(rc == -ELINKCONG)) {
851 tipc_dest_push(&tsk->cong_links, dnode, 0);
852 tsk->cong_link_cnt++;
855 /* Update send window */
856 tipc_group_update_member(mb, blks);
858 /* A broadcast sent within next EXPIRE period must follow same path */
859 method->rcast = true;
860 method->mandatory = true;
865 * tipc_send_group_unicast - send message to a member in the group
866 * @sock: socket structure
867 * @m: message to send
868 * @dlen: total length of message data
869 * @timeout: timeout to wait for wakeup
871 * Called from function tipc_sendmsg(), which has done all sanity checks
872 * Returns the number of bytes sent on success, or errno
874 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
875 int dlen, long timeout)
877 struct sock *sk = sock->sk;
878 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
879 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
880 struct tipc_sock *tsk = tipc_sk(sk);
881 struct tipc_group *grp = tsk->group;
882 struct net *net = sock_net(sk);
883 struct tipc_member *mb = NULL;
887 node = dest->addr.id.node;
888 port = dest->addr.id.ref;
890 return -EHOSTUNREACH;
892 /* Block or return if destination link or member is congested */
893 rc = tipc_wait_for_cond(sock, &timeout,
894 !tipc_dest_find(&tsk->cong_links, node, 0) &&
895 !tipc_group_cong(grp, node, port, blks, &mb));
900 return -EHOSTUNREACH;
902 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
904 return rc ? rc : dlen;
908 * tipc_send_group_anycast - send message to any member with given identity
909 * @sock: socket structure
910 * @m: message to send
911 * @dlen: total length of message data
912 * @timeout: timeout to wait for wakeup
914 * Called from function tipc_sendmsg(), which has done all sanity checks
915 * Returns the number of bytes sent on success, or errno
917 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
918 int dlen, long timeout)
920 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
921 struct sock *sk = sock->sk;
922 struct tipc_sock *tsk = tipc_sk(sk);
923 struct list_head *cong_links = &tsk->cong_links;
924 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
925 struct tipc_group *grp = tsk->group;
926 struct tipc_msg *hdr = &tsk->phdr;
927 struct tipc_member *first = NULL;
928 struct tipc_member *mbr = NULL;
929 struct net *net = sock_net(sk);
930 u32 node, port, exclude;
931 struct list_head dsts;
932 u32 type, inst, scope;
937 INIT_LIST_HEAD(&dsts);
939 type = msg_nametype(hdr);
940 inst = dest->addr.name.name.instance;
941 scope = msg_lookup_scope(hdr);
942 exclude = tipc_group_exclude(grp);
944 while (++lookups < 4) {
947 /* Look for a non-congested destination member, if any */
949 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
950 &dstcnt, exclude, false))
951 return -EHOSTUNREACH;
952 tipc_dest_pop(&dsts, &node, &port);
953 cong = tipc_group_cong(grp, node, port, blks, &mbr);
962 /* Start over if destination was not in member list */
966 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
969 /* Block or return if destination link or member is congested */
970 rc = tipc_wait_for_cond(sock, &timeout,
971 !tipc_dest_find(cong_links, node, 0) &&
972 !tipc_group_cong(grp, node, port,
977 /* Send, unless destination disappeared while waiting */
982 if (unlikely(lookups >= 4))
983 return -EHOSTUNREACH;
985 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
987 return rc ? rc : dlen;
991 * tipc_send_group_bcast - send message to all members in communication group
992 * @sk: socket structure
993 * @m: message to send
994 * @dlen: total length of message data
995 * @timeout: timeout to wait for wakeup
997 * Called from function tipc_sendmsg(), which has done all sanity checks
998 * Returns the number of bytes sent on success, or errno
1000 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1001 int dlen, long timeout)
1003 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1004 struct sock *sk = sock->sk;
1005 struct net *net = sock_net(sk);
1006 struct tipc_sock *tsk = tipc_sk(sk);
1007 struct tipc_group *grp = tsk->group;
1008 struct tipc_nlist *dsts = tipc_group_dests(grp);
1009 struct tipc_mc_method *method = &tsk->mc_method;
1010 bool ack = method->mandatory && method->rcast;
1011 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1012 struct tipc_msg *hdr = &tsk->phdr;
1013 int mtu = tipc_bcast_get_mtu(net);
1014 struct sk_buff_head pkts;
1015 int rc = -EHOSTUNREACH;
1017 if (!dsts->local && !dsts->remote)
1018 return -EHOSTUNREACH;
1020 /* Block or return if any destination link or member is congested */
1021 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt &&
1022 !tipc_group_bc_cong(grp, blks));
1026 /* Complete message header */
1028 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1029 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1031 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1032 msg_set_nameinst(hdr, 0);
1034 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1035 msg_set_destport(hdr, 0);
1036 msg_set_destnode(hdr, 0);
1037 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(grp));
1039 /* Avoid getting stuck with repeated forced replicasts */
1040 msg_set_grp_bc_ack_req(hdr, ack);
1042 /* Build message as chain of buffers */
1043 skb_queue_head_init(&pkts);
1044 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1045 if (unlikely(rc != dlen))
1049 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1053 /* Update broadcast sequence number and send windows */
1054 tipc_group_update_bc_members(tsk->group, blks, ack);
1056 /* Broadcast link is now free to choose method for next broadcast */
1057 method->mandatory = false;
1058 method->expires = jiffies;
1064 * tipc_send_group_mcast - send message to all members with given identity
1065 * @sock: socket structure
1066 * @m: message to send
1067 * @dlen: total length of message data
1068 * @timeout: timeout to wait for wakeup
1070 * Called from function tipc_sendmsg(), which has done all sanity checks
1071 * Returns the number of bytes sent on success, or errno
1073 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1074 int dlen, long timeout)
1076 struct sock *sk = sock->sk;
1077 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1078 struct tipc_sock *tsk = tipc_sk(sk);
1079 struct tipc_group *grp = tsk->group;
1080 struct tipc_msg *hdr = &tsk->phdr;
1081 struct net *net = sock_net(sk);
1082 u32 type, inst, scope, exclude;
1083 struct list_head dsts;
1086 INIT_LIST_HEAD(&dsts);
1088 type = msg_nametype(hdr);
1089 inst = dest->addr.name.name.instance;
1090 scope = msg_lookup_scope(hdr);
1091 exclude = tipc_group_exclude(grp);
1093 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1094 &dstcnt, exclude, true))
1095 return -EHOSTUNREACH;
1098 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1099 return tipc_send_group_unicast(sock, m, dlen, timeout);
1102 tipc_dest_list_purge(&dsts);
1103 return tipc_send_group_bcast(sock, m, dlen, timeout);
1107 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1108 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1109 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1111 * Multi-threaded: parallel calls with reference to same queues may occur
1113 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1114 struct sk_buff_head *inputq)
1116 u32 self = tipc_own_addr(net);
1117 u32 type, lower, upper, scope;
1118 struct sk_buff *skb, *_skb;
1120 struct sk_buff_head tmpq;
1121 struct list_head dports;
1122 struct tipc_msg *hdr;
1123 int user, mtyp, hlen;
1126 __skb_queue_head_init(&tmpq);
1127 INIT_LIST_HEAD(&dports);
1129 skb = tipc_skb_peek(arrvq, &inputq->lock);
1130 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1132 user = msg_user(hdr);
1133 mtyp = msg_type(hdr);
1134 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1135 onode = msg_orignode(hdr);
1136 type = msg_nametype(hdr);
1138 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1139 spin_lock_bh(&inputq->lock);
1140 if (skb_peek(arrvq) == skb) {
1141 __skb_dequeue(arrvq);
1142 __skb_queue_tail(inputq, skb);
1145 spin_unlock_bh(&inputq->lock);
1149 /* Group messages require exact scope match */
1150 if (msg_in_group(hdr)) {
1153 scope = msg_lookup_scope(hdr);
1156 /* TIPC_NODE_SCOPE means "any scope" in this context */
1158 scope = TIPC_NODE_SCOPE;
1160 scope = TIPC_CLUSTER_SCOPE;
1162 lower = msg_namelower(hdr);
1163 upper = msg_nameupper(hdr);
1166 /* Create destination port list: */
1167 tipc_nametbl_mc_lookup(net, type, lower, upper,
1168 scope, exact, &dports);
1170 /* Clone message per destination */
1171 while (tipc_dest_pop(&dports, NULL, &portid)) {
1172 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1174 msg_set_destport(buf_msg(_skb), portid);
1175 __skb_queue_tail(&tmpq, _skb);
1178 pr_warn("Failed to clone mcast rcv buffer\n");
1180 /* Append to inputq if not already done by other thread */
1181 spin_lock_bh(&inputq->lock);
1182 if (skb_peek(arrvq) == skb) {
1183 skb_queue_splice_tail_init(&tmpq, inputq);
1184 kfree_skb(__skb_dequeue(arrvq));
1186 spin_unlock_bh(&inputq->lock);
1187 __skb_queue_purge(&tmpq);
1190 tipc_sk_rcv(net, inputq);
1194 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1195 * @tsk: receiving socket
1196 * @skb: pointer to message buffer.
1198 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1199 struct sk_buff_head *xmitq)
1201 struct tipc_msg *hdr = buf_msg(skb);
1202 u32 onode = tsk_own_node(tsk);
1203 struct sock *sk = &tsk->sk;
1204 int mtyp = msg_type(hdr);
1207 /* Ignore if connection cannot be validated: */
1208 if (!tsk_peer_msg(tsk, hdr))
1211 if (unlikely(msg_errcode(hdr))) {
1212 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1213 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1214 tsk_peer_port(tsk));
1215 sk->sk_state_change(sk);
1219 tsk->probe_unacked = false;
1221 if (mtyp == CONN_PROBE) {
1222 msg_set_type(hdr, CONN_PROBE_REPLY);
1223 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1224 __skb_queue_tail(xmitq, skb);
1226 } else if (mtyp == CONN_ACK) {
1227 conn_cong = tsk_conn_cong(tsk);
1228 tsk->snt_unacked -= msg_conn_ack(hdr);
1229 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1230 tsk->snd_win = msg_adv_win(hdr);
1232 sk->sk_write_space(sk);
1233 } else if (mtyp != CONN_PROBE_REPLY) {
1234 pr_warn("Received unknown CONN_PROTO msg\n");
1241 * tipc_sendmsg - send message in connectionless manner
1242 * @sock: socket structure
1243 * @m: message to send
1244 * @dsz: amount of user data to be sent
1246 * Message must have an destination specified explicitly.
1247 * Used for SOCK_RDM and SOCK_DGRAM messages,
1248 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1249 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1251 * Returns the number of bytes sent on success, or errno otherwise
1253 static int tipc_sendmsg(struct socket *sock,
1254 struct msghdr *m, size_t dsz)
1256 struct sock *sk = sock->sk;
1260 ret = __tipc_sendmsg(sock, m, dsz);
1266 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1268 struct sock *sk = sock->sk;
1269 struct net *net = sock_net(sk);
1270 struct tipc_sock *tsk = tipc_sk(sk);
1271 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1272 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1273 struct list_head *clinks = &tsk->cong_links;
1274 bool syn = !tipc_sk_type_connectionless(sk);
1275 struct tipc_group *grp = tsk->group;
1276 struct tipc_msg *hdr = &tsk->phdr;
1277 struct tipc_name_seq *seq;
1278 struct sk_buff_head pkts;
1279 u32 dport, dnode = 0;
1283 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1287 if (unlikely(m->msg_namelen < sizeof(*dest)))
1289 if (unlikely(dest->family != AF_TIPC))
1295 return tipc_send_group_bcast(sock, m, dlen, timeout);
1296 if (dest->addrtype == TIPC_ADDR_NAME)
1297 return tipc_send_group_anycast(sock, m, dlen, timeout);
1298 if (dest->addrtype == TIPC_ADDR_ID)
1299 return tipc_send_group_unicast(sock, m, dlen, timeout);
1300 if (dest->addrtype == TIPC_ADDR_MCAST)
1301 return tipc_send_group_mcast(sock, m, dlen, timeout);
1305 if (unlikely(!dest)) {
1307 if (!syn || dest->family != AF_TIPC)
1308 return -EDESTADDRREQ;
1311 if (unlikely(syn)) {
1312 if (sk->sk_state == TIPC_LISTEN)
1314 if (sk->sk_state != TIPC_OPEN)
1318 if (dest->addrtype == TIPC_ADDR_NAME) {
1319 tsk->conn_type = dest->addr.name.name.type;
1320 tsk->conn_instance = dest->addr.name.name.instance;
1324 seq = &dest->addr.nameseq;
1325 if (dest->addrtype == TIPC_ADDR_MCAST)
1326 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1328 if (dest->addrtype == TIPC_ADDR_NAME) {
1329 type = dest->addr.name.name.type;
1330 inst = dest->addr.name.name.instance;
1331 dnode = dest->addr.name.domain;
1332 msg_set_type(hdr, TIPC_NAMED_MSG);
1333 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1334 msg_set_nametype(hdr, type);
1335 msg_set_nameinst(hdr, inst);
1336 msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
1337 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1338 msg_set_destnode(hdr, dnode);
1339 msg_set_destport(hdr, dport);
1340 if (unlikely(!dport && !dnode))
1341 return -EHOSTUNREACH;
1342 } else if (dest->addrtype == TIPC_ADDR_ID) {
1343 dnode = dest->addr.id.node;
1344 msg_set_type(hdr, TIPC_DIRECT_MSG);
1345 msg_set_lookup_scope(hdr, 0);
1346 msg_set_destnode(hdr, dnode);
1347 msg_set_destport(hdr, dest->addr.id.ref);
1348 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1353 /* Block or return if destination link is congested */
1354 rc = tipc_wait_for_cond(sock, &timeout,
1355 !tipc_dest_find(clinks, dnode, 0));
1359 skb_queue_head_init(&pkts);
1360 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
1361 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1362 if (unlikely(rc != dlen))
1365 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1366 if (unlikely(rc == -ELINKCONG)) {
1367 tipc_dest_push(clinks, dnode, 0);
1368 tsk->cong_link_cnt++;
1372 if (unlikely(syn && !rc))
1373 tipc_set_sk_state(sk, TIPC_CONNECTING);
1375 return rc ? rc : dlen;
1379 * tipc_sendstream - send stream-oriented data
1380 * @sock: socket structure
1382 * @dsz: total length of data to be transmitted
1384 * Used for SOCK_STREAM data.
1386 * Returns the number of bytes sent on success (or partial success),
1387 * or errno if no data sent
1389 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1391 struct sock *sk = sock->sk;
1395 ret = __tipc_sendstream(sock, m, dsz);
1401 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1403 struct sock *sk = sock->sk;
1404 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1405 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1406 struct tipc_sock *tsk = tipc_sk(sk);
1407 struct tipc_msg *hdr = &tsk->phdr;
1408 struct net *net = sock_net(sk);
1409 struct sk_buff_head pkts;
1410 u32 dnode = tsk_peer_node(tsk);
1414 skb_queue_head_init(&pkts);
1416 if (unlikely(dlen > INT_MAX))
1419 /* Handle implicit connection setup */
1420 if (unlikely(dest)) {
1421 rc = __tipc_sendmsg(sock, m, dlen);
1422 if (dlen && dlen == rc) {
1423 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1424 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1430 rc = tipc_wait_for_cond(sock, &timeout,
1431 (!tsk->cong_link_cnt &&
1432 !tsk_conn_cong(tsk) &&
1433 tipc_sk_connected(sk)));
1437 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1438 rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
1439 if (unlikely(rc != send))
1442 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1443 if (unlikely(rc == -ELINKCONG)) {
1444 tsk->cong_link_cnt = 1;
1448 tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
1451 } while (sent < dlen && !rc);
1453 return sent ? sent : rc;
1457 * tipc_send_packet - send a connection-oriented message
1458 * @sock: socket structure
1459 * @m: message to send
1460 * @dsz: length of data to be transmitted
1462 * Used for SOCK_SEQPACKET messages.
1464 * Returns the number of bytes sent on success, or errno otherwise
1466 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1468 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1471 return tipc_sendstream(sock, m, dsz);
1474 /* tipc_sk_finish_conn - complete the setup of a connection
1476 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1479 struct sock *sk = &tsk->sk;
1480 struct net *net = sock_net(sk);
1481 struct tipc_msg *msg = &tsk->phdr;
1483 msg_set_destnode(msg, peer_node);
1484 msg_set_destport(msg, peer_port);
1485 msg_set_type(msg, TIPC_CONN_MSG);
1486 msg_set_lookup_scope(msg, 0);
1487 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1489 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1490 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1491 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1492 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1493 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1494 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1497 /* Fall back to message based flow control */
1498 tsk->rcv_win = FLOWCTL_MSG_WIN;
1499 tsk->snd_win = FLOWCTL_MSG_WIN;
1503 * tipc_sk_set_orig_addr - capture sender's address for received message
1504 * @m: descriptor for message info
1505 * @hdr: received message header
1507 * Note: Address is not captured if not requested by receiver.
1509 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1511 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1512 struct tipc_msg *hdr = buf_msg(skb);
1517 srcaddr->sock.family = AF_TIPC;
1518 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1519 srcaddr->sock.scope = 0;
1520 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1521 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1522 srcaddr->sock.addr.name.domain = 0;
1523 m->msg_namelen = sizeof(struct sockaddr_tipc);
1525 if (!msg_in_group(hdr))
1528 /* Group message users may also want to know sending member's id */
1529 srcaddr->member.family = AF_TIPC;
1530 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1531 srcaddr->member.scope = 0;
1532 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1533 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1534 srcaddr->member.addr.name.domain = 0;
1535 m->msg_namelen = sizeof(*srcaddr);
1539 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1540 * @m: descriptor for message info
1541 * @msg: received message header
1542 * @tsk: TIPC port associated with message
1544 * Note: Ancillary data is not captured if not requested by receiver.
1546 * Returns 0 if successful, otherwise errno
1548 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1549 struct tipc_sock *tsk)
1557 if (likely(m->msg_controllen == 0))
1560 /* Optionally capture errored message object(s) */
1561 err = msg ? msg_errcode(msg) : 0;
1562 if (unlikely(err)) {
1564 anc_data[1] = msg_data_sz(msg);
1565 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1569 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1576 /* Optionally capture message destination object */
1577 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1578 switch (dest_type) {
1579 case TIPC_NAMED_MSG:
1581 anc_data[0] = msg_nametype(msg);
1582 anc_data[1] = msg_namelower(msg);
1583 anc_data[2] = msg_namelower(msg);
1585 case TIPC_MCAST_MSG:
1587 anc_data[0] = msg_nametype(msg);
1588 anc_data[1] = msg_namelower(msg);
1589 anc_data[2] = msg_nameupper(msg);
1592 has_name = (tsk->conn_type != 0);
1593 anc_data[0] = tsk->conn_type;
1594 anc_data[1] = tsk->conn_instance;
1595 anc_data[2] = tsk->conn_instance;
1601 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1609 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1611 struct sock *sk = &tsk->sk;
1612 struct net *net = sock_net(sk);
1613 struct sk_buff *skb = NULL;
1614 struct tipc_msg *msg;
1615 u32 peer_port = tsk_peer_port(tsk);
1616 u32 dnode = tsk_peer_node(tsk);
1618 if (!tipc_sk_connected(sk))
1620 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1621 dnode, tsk_own_node(tsk), peer_port,
1622 tsk->portid, TIPC_OK);
1626 msg_set_conn_ack(msg, tsk->rcv_unacked);
1627 tsk->rcv_unacked = 0;
1629 /* Adjust to and advertize the correct window limit */
1630 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1631 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1632 msg_set_adv_win(msg, tsk->rcv_win);
1634 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1637 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1639 struct sock *sk = sock->sk;
1641 long timeo = *timeop;
1642 int err = sock_error(sk);
1648 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1649 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1650 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1655 timeo = schedule_timeout(timeo);
1659 if (!skb_queue_empty(&sk->sk_receive_queue))
1664 err = sock_intr_errno(timeo);
1665 if (signal_pending(current))
1668 err = sock_error(sk);
1672 finish_wait(sk_sleep(sk), &wait);
1678 * tipc_recvmsg - receive packet-oriented message
1679 * @m: descriptor for message info
1680 * @buflen: length of user buffer area
1681 * @flags: receive flags
1683 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1684 * If the complete message doesn't fit in user area, truncate it.
1686 * Returns size of returned message data, errno otherwise
1688 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1689 size_t buflen, int flags)
1691 struct sock *sk = sock->sk;
1692 bool connected = !tipc_sk_type_connectionless(sk);
1693 struct tipc_sock *tsk = tipc_sk(sk);
1694 int rc, err, hlen, dlen, copy;
1695 struct sk_buff_head xmitq;
1696 struct tipc_msg *hdr;
1697 struct sk_buff *skb;
1701 /* Catch invalid receive requests */
1702 if (unlikely(!buflen))
1706 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1710 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1712 /* Step rcv queue to first msg with data or error; wait if necessary */
1714 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1717 skb = skb_peek(&sk->sk_receive_queue);
1719 dlen = msg_data_sz(hdr);
1720 hlen = msg_hdr_sz(hdr);
1721 err = msg_errcode(hdr);
1722 grp_evt = msg_is_grp_evt(hdr);
1723 if (likely(dlen || err))
1725 tsk_advance_rx_queue(sk);
1728 /* Collect msg meta data, including error code and rejected data */
1729 tipc_sk_set_orig_addr(m, skb);
1730 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1734 /* Capture data if non-error msg, otherwise just set return value */
1736 copy = min_t(int, dlen, buflen);
1737 if (unlikely(copy != dlen))
1738 m->msg_flags |= MSG_TRUNC;
1739 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1743 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1749 /* Mark message as group event if applicable */
1750 if (unlikely(grp_evt)) {
1751 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1752 m->msg_flags |= MSG_EOR;
1753 m->msg_flags |= MSG_OOB;
1757 /* Caption of data or error code/rejected data was successful */
1758 if (unlikely(flags & MSG_PEEK))
1761 /* Send group flow control advertisement when applicable */
1762 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1763 skb_queue_head_init(&xmitq);
1764 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1765 msg_orignode(hdr), msg_origport(hdr),
1767 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1770 tsk_advance_rx_queue(sk);
1772 if (likely(!connected))
1775 /* Send connection flow control advertisement when applicable */
1776 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1777 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1778 tipc_sk_send_ack(tsk);
1781 return rc ? rc : copy;
1785 * tipc_recvstream - receive stream-oriented data
1786 * @m: descriptor for message info
1787 * @buflen: total size of user buffer area
1788 * @flags: receive flags
1790 * Used for SOCK_STREAM messages only. If not enough data is available
1791 * will optionally wait for more; never truncates data.
1793 * Returns size of returned message data, errno otherwise
1795 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1796 size_t buflen, int flags)
1798 struct sock *sk = sock->sk;
1799 struct tipc_sock *tsk = tipc_sk(sk);
1800 struct sk_buff *skb;
1801 struct tipc_msg *hdr;
1802 struct tipc_skb_cb *skb_cb;
1803 bool peek = flags & MSG_PEEK;
1804 int offset, required, copy, copied = 0;
1805 int hlen, dlen, err, rc;
1808 /* Catch invalid receive attempts */
1809 if (unlikely(!buflen))
1814 if (unlikely(sk->sk_state == TIPC_OPEN)) {
1818 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
1819 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1822 /* Look at first msg in receive queue; wait if necessary */
1823 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1826 skb = skb_peek(&sk->sk_receive_queue);
1827 skb_cb = TIPC_SKB_CB(skb);
1829 dlen = msg_data_sz(hdr);
1830 hlen = msg_hdr_sz(hdr);
1831 err = msg_errcode(hdr);
1833 /* Discard any empty non-errored (SYN-) message */
1834 if (unlikely(!dlen && !err)) {
1835 tsk_advance_rx_queue(sk);
1839 /* Collect msg meta data, incl. error code and rejected data */
1841 tipc_sk_set_orig_addr(m, skb);
1842 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1847 /* Copy data if msg ok, otherwise return error/partial data */
1849 offset = skb_cb->bytes_read;
1850 copy = min_t(int, dlen - offset, buflen - copied);
1851 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1856 if (unlikely(offset < dlen)) {
1858 skb_cb->bytes_read = offset;
1863 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
1872 tsk_advance_rx_queue(sk);
1874 /* Send connection flow control advertisement when applicable */
1875 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1876 if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
1877 tipc_sk_send_ack(tsk);
1879 /* Exit if all requested data or FIN/error received */
1880 if (copied == buflen || err)
1883 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
1886 return copied ? copied : rc;
1890 * tipc_write_space - wake up thread if port congestion is released
1893 static void tipc_write_space(struct sock *sk)
1895 struct socket_wq *wq;
1898 wq = rcu_dereference(sk->sk_wq);
1899 if (skwq_has_sleeper(wq))
1900 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
1901 EPOLLWRNORM | EPOLLWRBAND);
1906 * tipc_data_ready - wake up threads to indicate messages have been received
1908 * @len: the length of messages
1910 static void tipc_data_ready(struct sock *sk)
1912 struct socket_wq *wq;
1915 wq = rcu_dereference(sk->sk_wq);
1916 if (skwq_has_sleeper(wq))
1917 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
1918 EPOLLRDNORM | EPOLLRDBAND);
1922 static void tipc_sock_destruct(struct sock *sk)
1924 __skb_queue_purge(&sk->sk_receive_queue);
1927 static void tipc_sk_proto_rcv(struct sock *sk,
1928 struct sk_buff_head *inputq,
1929 struct sk_buff_head *xmitq)
1931 struct sk_buff *skb = __skb_dequeue(inputq);
1932 struct tipc_sock *tsk = tipc_sk(sk);
1933 struct tipc_msg *hdr = buf_msg(skb);
1934 struct tipc_group *grp = tsk->group;
1935 bool wakeup = false;
1937 switch (msg_user(hdr)) {
1939 tipc_sk_conn_proto_rcv(tsk, skb, xmitq);
1942 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
1943 tsk->cong_link_cnt--;
1946 case GROUP_PROTOCOL:
1947 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
1950 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
1951 hdr, inputq, xmitq);
1958 sk->sk_write_space(sk);
1964 * tipc_filter_connect - Handle incoming message for a connection-based socket
1966 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1968 * Returns true if everything ok, false otherwise
1970 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
1972 struct sock *sk = &tsk->sk;
1973 struct net *net = sock_net(sk);
1974 struct tipc_msg *hdr = buf_msg(skb);
1975 u32 pport = msg_origport(hdr);
1976 u32 pnode = msg_orignode(hdr);
1978 if (unlikely(msg_mcast(hdr)))
1981 switch (sk->sk_state) {
1982 case TIPC_CONNECTING:
1983 /* Accept only ACK or NACK message */
1984 if (unlikely(!msg_connected(hdr))) {
1985 if (pport != tsk_peer_port(tsk) ||
1986 pnode != tsk_peer_node(tsk))
1989 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1990 sk->sk_err = ECONNREFUSED;
1991 sk->sk_state_change(sk);
1995 if (unlikely(msg_errcode(hdr))) {
1996 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1997 sk->sk_err = ECONNREFUSED;
1998 sk->sk_state_change(sk);
2002 if (unlikely(!msg_isdata(hdr))) {
2003 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2004 sk->sk_err = EINVAL;
2005 sk->sk_state_change(sk);
2009 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
2010 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2012 /* If 'ACK+' message, add to socket receive queue */
2013 if (msg_data_sz(hdr))
2016 /* If empty 'ACK-' message, wake up sleeping connect() */
2017 sk->sk_data_ready(sk);
2019 /* 'ACK-' message is neither accepted nor rejected: */
2020 msg_set_dest_droppable(hdr, 1);
2024 case TIPC_DISCONNECTING:
2027 /* Accept only SYN message */
2028 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
2031 case TIPC_ESTABLISHED:
2032 /* Accept only connection-based messages sent by peer */
2033 if (unlikely(!tsk_peer_msg(tsk, hdr)))
2036 if (unlikely(msg_errcode(hdr))) {
2037 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2038 /* Let timer expire on it's own */
2039 tipc_node_remove_conn(net, tsk_peer_node(tsk),
2041 sk->sk_state_change(sk);
2045 pr_err("Unknown sk_state %u\n", sk->sk_state);
2052 * rcvbuf_limit - get proper overload limit of socket receive queue
2056 * For connection oriented messages, irrespective of importance,
2057 * default queue limit is 2 MB.
2059 * For connectionless messages, queue limits are based on message
2060 * importance as follows:
2062 * TIPC_LOW_IMPORTANCE (2 MB)
2063 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2064 * TIPC_HIGH_IMPORTANCE (8 MB)
2065 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2067 * Returns overload limit according to corresponding message importance
2069 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2071 struct tipc_sock *tsk = tipc_sk(sk);
2072 struct tipc_msg *hdr = buf_msg(skb);
2074 if (unlikely(msg_in_group(hdr)))
2075 return sk->sk_rcvbuf;
2077 if (unlikely(!msg_connected(hdr)))
2078 return sk->sk_rcvbuf << msg_importance(hdr);
2080 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2081 return sk->sk_rcvbuf;
2083 return FLOWCTL_MSG_LIM;
2087 * tipc_sk_filter_rcv - validate incoming message
2089 * @skb: pointer to message.
2091 * Enqueues message on receive queue if acceptable; optionally handles
2092 * disconnect indication for a connected socket.
2094 * Called with socket lock already taken
2097 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2098 struct sk_buff_head *xmitq)
2100 bool sk_conn = !tipc_sk_type_connectionless(sk);
2101 struct tipc_sock *tsk = tipc_sk(sk);
2102 struct tipc_group *grp = tsk->group;
2103 struct tipc_msg *hdr = buf_msg(skb);
2104 struct net *net = sock_net(sk);
2105 struct sk_buff_head inputq;
2106 int limit, err = TIPC_OK;
2108 TIPC_SKB_CB(skb)->bytes_read = 0;
2109 __skb_queue_head_init(&inputq);
2110 __skb_queue_tail(&inputq, skb);
2112 if (unlikely(!msg_isdata(hdr)))
2113 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2116 tipc_group_filter_msg(grp, &inputq, xmitq);
2118 /* Validate and add to receive buffer if there is space */
2119 while ((skb = __skb_dequeue(&inputq))) {
2121 limit = rcvbuf_limit(sk, skb);
2122 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
2123 (!sk_conn && msg_connected(hdr)) ||
2124 (!grp && msg_in_group(hdr)))
2125 err = TIPC_ERR_NO_PORT;
2126 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2127 atomic_inc(&sk->sk_drops);
2128 err = TIPC_ERR_OVERLOAD;
2131 if (unlikely(err)) {
2132 tipc_skb_reject(net, err, skb, xmitq);
2136 __skb_queue_tail(&sk->sk_receive_queue, skb);
2137 skb_set_owner_r(skb, sk);
2138 sk->sk_data_ready(sk);
2143 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2147 * Caller must hold socket lock
2149 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2151 unsigned int before = sk_rmem_alloc_get(sk);
2152 struct sk_buff_head xmitq;
2155 __skb_queue_head_init(&xmitq);
2157 tipc_sk_filter_rcv(sk, skb, &xmitq);
2158 added = sk_rmem_alloc_get(sk) - before;
2159 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2161 /* Send pending response/rejected messages, if any */
2162 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2167 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2168 * inputq and try adding them to socket or backlog queue
2169 * @inputq: list of incoming buffers with potentially different destinations
2170 * @sk: socket where the buffers should be enqueued
2171 * @dport: port number for the socket
2173 * Caller must hold socket lock
2175 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2176 u32 dport, struct sk_buff_head *xmitq)
2178 unsigned long time_limit = jiffies + 2;
2179 struct sk_buff *skb;
2184 while (skb_queue_len(inputq)) {
2185 if (unlikely(time_after_eq(jiffies, time_limit)))
2188 skb = tipc_skb_dequeue(inputq, dport);
2192 /* Add message directly to receive queue if possible */
2193 if (!sock_owned_by_user(sk)) {
2194 tipc_sk_filter_rcv(sk, skb, xmitq);
2198 /* Try backlog, compensating for double-counted bytes */
2199 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2200 if (!sk->sk_backlog.len)
2201 atomic_set(dcnt, 0);
2202 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2203 if (likely(!sk_add_backlog(sk, skb, lim)))
2206 /* Overload => reject message back to sender */
2207 onode = tipc_own_addr(sock_net(sk));
2208 atomic_inc(&sk->sk_drops);
2209 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
2210 __skb_queue_tail(xmitq, skb);
2216 * tipc_sk_rcv - handle a chain of incoming buffers
2217 * @inputq: buffer list containing the buffers
2218 * Consumes all buffers in list until inputq is empty
2219 * Note: may be called in multiple threads referring to the same queue
2221 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2223 struct sk_buff_head xmitq;
2224 u32 dnode, dport = 0;
2226 struct tipc_sock *tsk;
2228 struct sk_buff *skb;
2230 __skb_queue_head_init(&xmitq);
2231 while (skb_queue_len(inputq)) {
2232 dport = tipc_skb_peek_port(inputq, dport);
2233 tsk = tipc_sk_lookup(net, dport);
2237 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2238 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2239 spin_unlock_bh(&sk->sk_lock.slock);
2241 /* Send pending response/rejected messages, if any */
2242 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2246 /* No destination socket => dequeue skb if still there */
2247 skb = tipc_skb_dequeue(inputq, dport);
2251 /* Try secondary lookup if unresolved named message */
2252 err = TIPC_ERR_NO_PORT;
2253 if (tipc_msg_lookup_dest(net, skb, &err))
2256 /* Prepare for message rejection */
2257 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2260 dnode = msg_destnode(buf_msg(skb));
2261 tipc_node_xmit_skb(net, skb, dnode, dport);
2265 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2267 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2268 struct sock *sk = sock->sk;
2272 int err = sock_error(sk);
2277 if (signal_pending(current))
2278 return sock_intr_errno(*timeo_p);
2280 add_wait_queue(sk_sleep(sk), &wait);
2281 done = sk_wait_event(sk, timeo_p,
2282 sk->sk_state != TIPC_CONNECTING, &wait);
2283 remove_wait_queue(sk_sleep(sk), &wait);
2289 * tipc_connect - establish a connection to another TIPC port
2290 * @sock: socket structure
2291 * @dest: socket address for destination port
2292 * @destlen: size of socket address data structure
2293 * @flags: file-related flags associated with socket
2295 * Returns 0 on success, errno otherwise
2297 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2298 int destlen, int flags)
2300 struct sock *sk = sock->sk;
2301 struct tipc_sock *tsk = tipc_sk(sk);
2302 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2303 struct msghdr m = {NULL,};
2304 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2308 if (destlen != sizeof(struct sockaddr_tipc))
2318 if (dst->family == AF_UNSPEC) {
2319 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2320 if (!tipc_sk_type_connectionless(sk))
2323 } else if (dst->family != AF_TIPC) {
2326 if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME)
2331 /* DGRAM/RDM connect(), just save the destaddr */
2332 if (tipc_sk_type_connectionless(sk)) {
2333 memcpy(&tsk->peer, dest, destlen);
2337 previous = sk->sk_state;
2339 switch (sk->sk_state) {
2341 /* Send a 'SYN-' to destination */
2343 m.msg_namelen = destlen;
2345 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2346 * indicate send_msg() is never blocked.
2349 m.msg_flags = MSG_DONTWAIT;
2351 res = __tipc_sendmsg(sock, &m, 0);
2352 if ((res < 0) && (res != -EWOULDBLOCK))
2355 /* Just entered TIPC_CONNECTING state; the only
2356 * difference is that return value in non-blocking
2357 * case is EINPROGRESS, rather than EALREADY.
2361 case TIPC_CONNECTING:
2363 if (previous == TIPC_CONNECTING)
2367 timeout = msecs_to_jiffies(timeout);
2368 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2369 res = tipc_wait_for_connect(sock, &timeout);
2371 case TIPC_ESTABLISHED:
2384 * tipc_listen - allow socket to listen for incoming connections
2385 * @sock: socket structure
2388 * Returns 0 on success, errno otherwise
2390 static int tipc_listen(struct socket *sock, int len)
2392 struct sock *sk = sock->sk;
2396 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2402 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2404 struct sock *sk = sock->sk;
2408 /* True wake-one mechanism for incoming connections: only
2409 * one process gets woken up, not the 'whole herd'.
2410 * Since we do not 'race & poll' for established sockets
2411 * anymore, the common case will execute the loop only once.
2414 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2415 TASK_INTERRUPTIBLE);
2416 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2418 timeo = schedule_timeout(timeo);
2422 if (!skb_queue_empty(&sk->sk_receive_queue))
2427 err = sock_intr_errno(timeo);
2428 if (signal_pending(current))
2431 finish_wait(sk_sleep(sk), &wait);
2436 * tipc_accept - wait for connection request
2437 * @sock: listening socket
2438 * @newsock: new socket that is to be connected
2439 * @flags: file-related flags associated with socket
2441 * Returns 0 on success, errno otherwise
2443 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2446 struct sock *new_sk, *sk = sock->sk;
2447 struct sk_buff *buf;
2448 struct tipc_sock *new_tsock;
2449 struct tipc_msg *msg;
2455 if (sk->sk_state != TIPC_LISTEN) {
2459 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2460 res = tipc_wait_for_accept(sock, timeo);
2464 buf = skb_peek(&sk->sk_receive_queue);
2466 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2469 security_sk_clone(sock->sk, new_sock->sk);
2471 new_sk = new_sock->sk;
2472 new_tsock = tipc_sk(new_sk);
2475 /* we lock on new_sk; but lockdep sees the lock on sk */
2476 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2479 * Reject any stray messages received by new socket
2480 * before the socket lock was taken (very, very unlikely)
2482 tsk_rej_rx_queue(new_sk);
2484 /* Connect new socket to it's peer */
2485 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2487 tsk_set_importance(new_tsock, msg_importance(msg));
2488 if (msg_named(msg)) {
2489 new_tsock->conn_type = msg_nametype(msg);
2490 new_tsock->conn_instance = msg_nameinst(msg);
2494 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2495 * Respond to 'SYN+' by queuing it on new socket.
2497 if (!msg_data_sz(msg)) {
2498 struct msghdr m = {NULL,};
2500 tsk_advance_rx_queue(sk);
2501 __tipc_sendstream(new_sock, &m, 0);
2503 __skb_dequeue(&sk->sk_receive_queue);
2504 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2505 skb_set_owner_r(buf, new_sk);
2507 release_sock(new_sk);
2514 * tipc_shutdown - shutdown socket connection
2515 * @sock: socket structure
2516 * @how: direction to close (must be SHUT_RDWR)
2518 * Terminates connection (if necessary), then purges socket's receive queue.
2520 * Returns 0 on success, errno otherwise
2522 static int tipc_shutdown(struct socket *sock, int how)
2524 struct sock *sk = sock->sk;
2527 if (how != SHUT_RDWR)
2532 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2533 sk->sk_shutdown = SEND_SHUTDOWN;
2535 if (sk->sk_state == TIPC_DISCONNECTING) {
2536 /* Discard any unreceived messages */
2537 __skb_queue_purge(&sk->sk_receive_queue);
2539 /* Wake up anyone sleeping in poll */
2540 sk->sk_state_change(sk);
2550 static void tipc_sk_timeout(struct timer_list *t)
2552 struct sock *sk = from_timer(sk, t, sk_timer);
2553 struct tipc_sock *tsk = tipc_sk(sk);
2554 u32 peer_port = tsk_peer_port(tsk);
2555 u32 peer_node = tsk_peer_node(tsk);
2556 u32 own_node = tsk_own_node(tsk);
2557 u32 own_port = tsk->portid;
2558 struct net *net = sock_net(sk);
2559 struct sk_buff *skb = NULL;
2562 if (!tipc_sk_connected(sk))
2565 /* Try again later if socket is busy */
2566 if (sock_owned_by_user(sk)) {
2567 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2571 if (tsk->probe_unacked) {
2572 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2573 tipc_node_remove_conn(net, peer_node, peer_port);
2574 sk->sk_state_change(sk);
2577 /* Send new probe */
2578 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2579 peer_node, own_node, peer_port, own_port,
2581 tsk->probe_unacked = true;
2582 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2586 tipc_node_xmit_skb(net, skb, peer_node, own_port);
2590 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2591 struct tipc_name_seq const *seq)
2593 struct sock *sk = &tsk->sk;
2594 struct net *net = sock_net(sk);
2595 struct publication *publ;
2598 if (scope != TIPC_NODE_SCOPE)
2599 scope = TIPC_CLUSTER_SCOPE;
2601 if (tipc_sk_connected(sk))
2603 key = tsk->portid + tsk->pub_count + 1;
2604 if (key == tsk->portid)
2607 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2608 scope, tsk->portid, key);
2609 if (unlikely(!publ))
2612 list_add(&publ->binding_sock, &tsk->publications);
2618 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2619 struct tipc_name_seq const *seq)
2621 struct net *net = sock_net(&tsk->sk);
2622 struct publication *publ;
2623 struct publication *safe;
2626 if (scope != TIPC_NODE_SCOPE)
2627 scope = TIPC_CLUSTER_SCOPE;
2629 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
2631 if (publ->scope != scope)
2633 if (publ->type != seq->type)
2635 if (publ->lower != seq->lower)
2637 if (publ->upper != seq->upper)
2639 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2640 publ->upper, publ->key);
2644 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2645 publ->upper, publ->key);
2648 if (list_empty(&tsk->publications))
2653 /* tipc_sk_reinit: set non-zero address in all existing sockets
2654 * when we go from standalone to network mode.
2656 void tipc_sk_reinit(struct net *net)
2658 struct tipc_net *tn = net_generic(net, tipc_net_id);
2659 struct rhashtable_iter iter;
2660 struct tipc_sock *tsk;
2661 struct tipc_msg *msg;
2663 rhashtable_walk_enter(&tn->sk_rht, &iter);
2666 rhashtable_walk_start(&iter);
2668 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2669 spin_lock_bh(&tsk->sk.sk_lock.slock);
2671 msg_set_prevnode(msg, tipc_own_addr(net));
2672 msg_set_orignode(msg, tipc_own_addr(net));
2673 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2676 rhashtable_walk_stop(&iter);
2677 } while (tsk == ERR_PTR(-EAGAIN));
2679 rhashtable_walk_exit(&iter);
2682 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2684 struct tipc_net *tn = net_generic(net, tipc_net_id);
2685 struct tipc_sock *tsk;
2688 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2690 sock_hold(&tsk->sk);
2696 static int tipc_sk_insert(struct tipc_sock *tsk)
2698 struct sock *sk = &tsk->sk;
2699 struct net *net = sock_net(sk);
2700 struct tipc_net *tn = net_generic(net, tipc_net_id);
2701 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2702 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2704 while (remaining--) {
2706 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2707 portid = TIPC_MIN_PORT;
2708 tsk->portid = portid;
2709 sock_hold(&tsk->sk);
2710 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2719 static void tipc_sk_remove(struct tipc_sock *tsk)
2721 struct sock *sk = &tsk->sk;
2722 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2724 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2725 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
2730 static const struct rhashtable_params tsk_rht_params = {
2732 .head_offset = offsetof(struct tipc_sock, node),
2733 .key_offset = offsetof(struct tipc_sock, portid),
2734 .key_len = sizeof(u32), /* portid */
2735 .max_size = 1048576,
2737 .automatic_shrinking = true,
2740 int tipc_sk_rht_init(struct net *net)
2742 struct tipc_net *tn = net_generic(net, tipc_net_id);
2744 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2747 void tipc_sk_rht_destroy(struct net *net)
2749 struct tipc_net *tn = net_generic(net, tipc_net_id);
2751 /* Wait for socket readers to complete */
2754 rhashtable_destroy(&tn->sk_rht);
2757 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
2759 struct net *net = sock_net(&tsk->sk);
2760 struct tipc_group *grp = tsk->group;
2761 struct tipc_msg *hdr = &tsk->phdr;
2762 struct tipc_name_seq seq;
2765 if (mreq->type < TIPC_RESERVED_TYPES)
2767 if (mreq->scope > TIPC_NODE_SCOPE)
2771 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
2775 msg_set_lookup_scope(hdr, mreq->scope);
2776 msg_set_nametype(hdr, mreq->type);
2777 msg_set_dest_droppable(hdr, true);
2778 seq.type = mreq->type;
2779 seq.lower = mreq->instance;
2780 seq.upper = seq.lower;
2781 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
2782 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
2784 tipc_group_delete(net, grp);
2788 /* Eliminate any risk that a broadcast overtakes sent JOINs */
2789 tsk->mc_method.rcast = true;
2790 tsk->mc_method.mandatory = true;
2791 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
2795 static int tipc_sk_leave(struct tipc_sock *tsk)
2797 struct net *net = sock_net(&tsk->sk);
2798 struct tipc_group *grp = tsk->group;
2799 struct tipc_name_seq seq;
2804 tipc_group_self(grp, &seq, &scope);
2805 tipc_group_delete(net, grp);
2807 tipc_sk_withdraw(tsk, scope, &seq);
2812 * tipc_setsockopt - set socket option
2813 * @sock: socket structure
2814 * @lvl: option level
2815 * @opt: option identifier
2816 * @ov: pointer to new option value
2817 * @ol: length of option value
2819 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2820 * (to ease compatibility).
2822 * Returns 0 on success, errno otherwise
2824 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2825 char __user *ov, unsigned int ol)
2827 struct sock *sk = sock->sk;
2828 struct tipc_sock *tsk = tipc_sk(sk);
2829 struct tipc_group_req mreq;
2833 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2835 if (lvl != SOL_TIPC)
2836 return -ENOPROTOOPT;
2839 case TIPC_IMPORTANCE:
2840 case TIPC_SRC_DROPPABLE:
2841 case TIPC_DEST_DROPPABLE:
2842 case TIPC_CONN_TIMEOUT:
2843 if (ol < sizeof(value))
2845 if (get_user(value, (u32 __user *)ov))
2848 case TIPC_GROUP_JOIN:
2849 if (ol < sizeof(mreq))
2851 if (copy_from_user(&mreq, ov, sizeof(mreq)))
2862 case TIPC_IMPORTANCE:
2863 res = tsk_set_importance(tsk, value);
2865 case TIPC_SRC_DROPPABLE:
2866 if (sock->type != SOCK_STREAM)
2867 tsk_set_unreliable(tsk, value);
2871 case TIPC_DEST_DROPPABLE:
2872 tsk_set_unreturnable(tsk, value);
2874 case TIPC_CONN_TIMEOUT:
2875 tipc_sk(sk)->conn_timeout = value;
2877 case TIPC_MCAST_BROADCAST:
2878 tsk->mc_method.rcast = false;
2879 tsk->mc_method.mandatory = true;
2881 case TIPC_MCAST_REPLICAST:
2882 tsk->mc_method.rcast = true;
2883 tsk->mc_method.mandatory = true;
2885 case TIPC_GROUP_JOIN:
2886 res = tipc_sk_join(tsk, &mreq);
2888 case TIPC_GROUP_LEAVE:
2889 res = tipc_sk_leave(tsk);
2901 * tipc_getsockopt - get socket option
2902 * @sock: socket structure
2903 * @lvl: option level
2904 * @opt: option identifier
2905 * @ov: receptacle for option value
2906 * @ol: receptacle for length of option value
2908 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2909 * (to ease compatibility).
2911 * Returns 0 on success, errno otherwise
2913 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2914 char __user *ov, int __user *ol)
2916 struct sock *sk = sock->sk;
2917 struct tipc_sock *tsk = tipc_sk(sk);
2918 struct tipc_name_seq seq;
2923 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2924 return put_user(0, ol);
2925 if (lvl != SOL_TIPC)
2926 return -ENOPROTOOPT;
2927 res = get_user(len, ol);
2934 case TIPC_IMPORTANCE:
2935 value = tsk_importance(tsk);
2937 case TIPC_SRC_DROPPABLE:
2938 value = tsk_unreliable(tsk);
2940 case TIPC_DEST_DROPPABLE:
2941 value = tsk_unreturnable(tsk);
2943 case TIPC_CONN_TIMEOUT:
2944 value = tsk->conn_timeout;
2945 /* no need to set "res", since already 0 at this point */
2947 case TIPC_NODE_RECVQ_DEPTH:
2948 value = 0; /* was tipc_queue_size, now obsolete */
2950 case TIPC_SOCK_RECVQ_DEPTH:
2951 value = skb_queue_len(&sk->sk_receive_queue);
2953 case TIPC_GROUP_JOIN:
2956 tipc_group_self(tsk->group, &seq, &scope);
2966 return res; /* "get" failed */
2968 if (len < sizeof(value))
2971 if (copy_to_user(ov, &value, sizeof(value)))
2974 return put_user(sizeof(value), ol);
2977 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2979 struct net *net = sock_net(sock->sk);
2980 struct tipc_sioc_nodeid_req nr = {0};
2981 struct tipc_sioc_ln_req lnr;
2982 void __user *argp = (void __user *)arg;
2985 case SIOCGETLINKNAME:
2986 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2988 if (!tipc_node_get_linkname(net,
2989 lnr.bearer_id & 0xffff, lnr.peer,
2990 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2991 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2995 return -EADDRNOTAVAIL;
2997 if (copy_from_user(&nr, argp, sizeof(nr)))
2999 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3000 return -EADDRNOTAVAIL;
3001 if (copy_to_user(argp, &nr, sizeof(nr)))
3005 return -ENOIOCTLCMD;
3009 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3011 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3012 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3013 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3015 tsk1->peer.family = AF_TIPC;
3016 tsk1->peer.addrtype = TIPC_ADDR_ID;
3017 tsk1->peer.scope = TIPC_NODE_SCOPE;
3018 tsk1->peer.addr.id.ref = tsk2->portid;
3019 tsk1->peer.addr.id.node = onode;
3020 tsk2->peer.family = AF_TIPC;
3021 tsk2->peer.addrtype = TIPC_ADDR_ID;
3022 tsk2->peer.scope = TIPC_NODE_SCOPE;
3023 tsk2->peer.addr.id.ref = tsk1->portid;
3024 tsk2->peer.addr.id.node = onode;
3026 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3027 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3031 /* Protocol switches for the various types of TIPC sockets */
3033 static const struct proto_ops msg_ops = {
3034 .owner = THIS_MODULE,
3036 .release = tipc_release,
3038 .connect = tipc_connect,
3039 .socketpair = tipc_socketpair,
3040 .accept = sock_no_accept,
3041 .getname = tipc_getname,
3043 .ioctl = tipc_ioctl,
3044 .listen = sock_no_listen,
3045 .shutdown = tipc_shutdown,
3046 .setsockopt = tipc_setsockopt,
3047 .getsockopt = tipc_getsockopt,
3048 .sendmsg = tipc_sendmsg,
3049 .recvmsg = tipc_recvmsg,
3050 .mmap = sock_no_mmap,
3051 .sendpage = sock_no_sendpage
3054 static const struct proto_ops packet_ops = {
3055 .owner = THIS_MODULE,
3057 .release = tipc_release,
3059 .connect = tipc_connect,
3060 .socketpair = tipc_socketpair,
3061 .accept = tipc_accept,
3062 .getname = tipc_getname,
3064 .ioctl = tipc_ioctl,
3065 .listen = tipc_listen,
3066 .shutdown = tipc_shutdown,
3067 .setsockopt = tipc_setsockopt,
3068 .getsockopt = tipc_getsockopt,
3069 .sendmsg = tipc_send_packet,
3070 .recvmsg = tipc_recvmsg,
3071 .mmap = sock_no_mmap,
3072 .sendpage = sock_no_sendpage
3075 static const struct proto_ops stream_ops = {
3076 .owner = THIS_MODULE,
3078 .release = tipc_release,
3080 .connect = tipc_connect,
3081 .socketpair = tipc_socketpair,
3082 .accept = tipc_accept,
3083 .getname = tipc_getname,
3085 .ioctl = tipc_ioctl,
3086 .listen = tipc_listen,
3087 .shutdown = tipc_shutdown,
3088 .setsockopt = tipc_setsockopt,
3089 .getsockopt = tipc_getsockopt,
3090 .sendmsg = tipc_sendstream,
3091 .recvmsg = tipc_recvstream,
3092 .mmap = sock_no_mmap,
3093 .sendpage = sock_no_sendpage
3096 static const struct net_proto_family tipc_family_ops = {
3097 .owner = THIS_MODULE,
3099 .create = tipc_sk_create
3102 static struct proto tipc_proto = {
3104 .owner = THIS_MODULE,
3105 .obj_size = sizeof(struct tipc_sock),
3106 .sysctl_rmem = sysctl_tipc_rmem
3110 * tipc_socket_init - initialize TIPC socket interface
3112 * Returns 0 on success, errno otherwise
3114 int tipc_socket_init(void)
3118 res = proto_register(&tipc_proto, 1);
3120 pr_err("Failed to register TIPC protocol type\n");
3124 res = sock_register(&tipc_family_ops);
3126 pr_err("Failed to register TIPC socket type\n");
3127 proto_unregister(&tipc_proto);
3135 * tipc_socket_stop - stop TIPC socket interface
3137 void tipc_socket_stop(void)
3139 sock_unregister(tipc_family_ops.family);
3140 proto_unregister(&tipc_proto);
3143 /* Caller should hold socket lock for the passed tipc socket. */
3144 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3148 struct nlattr *nest;
3150 peer_node = tsk_peer_node(tsk);
3151 peer_port = tsk_peer_port(tsk);
3153 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
3155 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3157 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3160 if (tsk->conn_type != 0) {
3161 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3163 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3165 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3168 nla_nest_end(skb, nest);
3173 nla_nest_cancel(skb, nest);
3178 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3181 struct net *net = sock_net(skb->sk);
3182 struct sock *sk = &tsk->sk;
3184 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3185 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3188 if (tipc_sk_connected(sk)) {
3189 if (__tipc_nl_add_sk_con(skb, tsk))
3191 } else if (!list_empty(&tsk->publications)) {
3192 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3198 /* Caller should hold socket lock for the passed tipc socket. */
3199 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3200 struct tipc_sock *tsk)
3202 struct nlattr *attrs;
3205 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3206 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3210 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
3212 goto genlmsg_cancel;
3214 if (__tipc_nl_add_sk_info(skb, tsk))
3215 goto attr_msg_cancel;
3217 nla_nest_end(skb, attrs);
3218 genlmsg_end(skb, hdr);
3223 nla_nest_cancel(skb, attrs);
3225 genlmsg_cancel(skb, hdr);
3230 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3231 int (*skb_handler)(struct sk_buff *skb,
3232 struct netlink_callback *cb,
3233 struct tipc_sock *tsk))
3235 struct rhashtable_iter *iter = (void *)cb->args[4];
3236 struct tipc_sock *tsk;
3239 rhashtable_walk_start(iter);
3240 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3243 if (err == -EAGAIN) {
3250 sock_hold(&tsk->sk);
3251 rhashtable_walk_stop(iter);
3252 lock_sock(&tsk->sk);
3253 err = skb_handler(skb, cb, tsk);
3255 release_sock(&tsk->sk);
3259 release_sock(&tsk->sk);
3260 rhashtable_walk_start(iter);
3263 rhashtable_walk_stop(iter);
3267 EXPORT_SYMBOL(tipc_nl_sk_walk);
3269 int tipc_dump_start(struct netlink_callback *cb)
3271 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3273 EXPORT_SYMBOL(tipc_dump_start);
3275 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3277 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3278 struct rhashtable_iter *iter = (void *)cb->args[4];
3279 struct tipc_net *tn = tipc_net(net);
3282 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3286 cb->args[4] = (long)iter;
3289 rhashtable_walk_enter(&tn->sk_rht, iter);
3293 int tipc_dump_done(struct netlink_callback *cb)
3295 struct rhashtable_iter *hti = (void *)cb->args[4];
3297 rhashtable_walk_exit(hti);
3301 EXPORT_SYMBOL(tipc_dump_done);
3303 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3304 struct tipc_sock *tsk, u32 sk_filter_state,
3305 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3307 struct sock *sk = &tsk->sk;
3308 struct nlattr *attrs;
3309 struct nlattr *stat;
3311 /*filter response w.r.t sk_state*/
3312 if (!(sk_filter_state & (1 << sk->sk_state)))
3315 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
3319 if (__tipc_nl_add_sk_info(skb, tsk))
3320 goto attr_msg_cancel;
3322 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3323 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3324 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3325 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3326 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3328 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3329 tipc_diag_gen_cookie(sk),
3331 goto attr_msg_cancel;
3333 stat = nla_nest_start(skb, TIPC_NLA_SOCK_STAT);
3335 goto attr_msg_cancel;
3337 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3338 skb_queue_len(&sk->sk_receive_queue)) ||
3339 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3340 skb_queue_len(&sk->sk_write_queue)) ||
3341 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3342 atomic_read(&sk->sk_drops)))
3343 goto stat_msg_cancel;
3345 if (tsk->cong_link_cnt &&
3346 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3347 goto stat_msg_cancel;
3349 if (tsk_conn_cong(tsk) &&
3350 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3351 goto stat_msg_cancel;
3353 nla_nest_end(skb, stat);
3356 if (tipc_group_fill_sock_diag(tsk->group, skb))
3357 goto stat_msg_cancel;
3359 nla_nest_end(skb, attrs);
3364 nla_nest_cancel(skb, stat);
3366 nla_nest_cancel(skb, attrs);
3370 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3372 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3374 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3377 /* Caller should hold socket lock for the passed tipc socket. */
3378 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3379 struct netlink_callback *cb,
3380 struct publication *publ)
3383 struct nlattr *attrs;
3385 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3386 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3390 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
3392 goto genlmsg_cancel;
3394 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3395 goto attr_msg_cancel;
3396 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3397 goto attr_msg_cancel;
3398 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3399 goto attr_msg_cancel;
3400 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3401 goto attr_msg_cancel;
3403 nla_nest_end(skb, attrs);
3404 genlmsg_end(skb, hdr);
3409 nla_nest_cancel(skb, attrs);
3411 genlmsg_cancel(skb, hdr);
3416 /* Caller should hold socket lock for the passed tipc socket. */
3417 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3418 struct netlink_callback *cb,
3419 struct tipc_sock *tsk, u32 *last_publ)
3422 struct publication *p;
3425 list_for_each_entry(p, &tsk->publications, binding_sock) {
3426 if (p->key == *last_publ)
3429 if (p->key != *last_publ) {
3430 /* We never set seq or call nl_dump_check_consistent()
3431 * this means that setting prev_seq here will cause the
3432 * consistence check to fail in the netlink callback
3433 * handler. Resulting in the last NLMSG_DONE message
3434 * having the NLM_F_DUMP_INTR flag set.
3441 p = list_first_entry(&tsk->publications, struct publication,
3445 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3446 err = __tipc_nl_add_sk_publ(skb, cb, p);
3448 *last_publ = p->key;
3457 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3460 u32 tsk_portid = cb->args[0];
3461 u32 last_publ = cb->args[1];
3462 u32 done = cb->args[2];
3463 struct net *net = sock_net(skb->sk);
3464 struct tipc_sock *tsk;
3467 struct nlattr **attrs;
3468 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3470 err = tipc_nlmsg_parse(cb->nlh, &attrs);
3474 if (!attrs[TIPC_NLA_SOCK])
3477 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
3478 attrs[TIPC_NLA_SOCK],
3479 tipc_nl_sock_policy, NULL);
3483 if (!sock[TIPC_NLA_SOCK_REF])
3486 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3492 tsk = tipc_sk_lookup(net, tsk_portid);
3496 lock_sock(&tsk->sk);
3497 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3500 release_sock(&tsk->sk);
3503 cb->args[0] = tsk_portid;
3504 cb->args[1] = last_publ;