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TOMOYO Linux Cross Reference
Linux/net/tipc/socket.c

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  1 /*
  2  * net/tipc/socket.c: TIPC socket API
  3  *
  4  * Copyright (c) 2001-2007, 2012-2016, Ericsson AB
  5  * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
  6  * All rights reserved.
  7  *
  8  * Redistribution and use in source and binary forms, with or without
  9  * modification, are permitted provided that the following conditions are met:
 10  *
 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.
 19  *
 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.
 23  *
 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
 30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 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.
 35  */
 36 
 37 #include <linux/rhashtable.h>
 38 #include "core.h"
 39 #include "name_table.h"
 40 #include "node.h"
 41 #include "link.h"
 42 #include "name_distr.h"
 43 #include "socket.h"
 44 #include "bcast.h"
 45 #include "netlink.h"
 46 
 47 #define CONN_TIMEOUT_DEFAULT    8000    /* default connect timeout = 8s */
 48 #define CONN_PROBING_INTERVAL   msecs_to_jiffies(3600000)  /* [ms] => 1 h */
 49 #define TIPC_FWD_MSG            1
 50 #define TIPC_MAX_PORT           0xffffffff
 51 #define TIPC_MIN_PORT           1
 52 
 53 enum {
 54         TIPC_LISTEN = TCP_LISTEN,
 55         TIPC_ESTABLISHED = TCP_ESTABLISHED,
 56         TIPC_OPEN = TCP_CLOSE,
 57         TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
 58         TIPC_CONNECTING = TCP_SYN_SENT,
 59 };
 60 
 61 /**
 62  * struct tipc_sock - TIPC socket structure
 63  * @sk: socket - interacts with 'port' and with user via the socket API
 64  * @conn_type: TIPC type used when connection was established
 65  * @conn_instance: TIPC instance used when connection was established
 66  * @published: non-zero if port has one or more associated names
 67  * @max_pkt: maximum packet size "hint" used when building messages sent by port
 68  * @portid: unique port identity in TIPC socket hash table
 69  * @phdr: preformatted message header used when sending messages
 70  * @publications: list of publications for port
 71  * @pub_count: total # of publications port has made during its lifetime
 72  * @probing_state:
 73  * @conn_timeout: the time we can wait for an unresponded setup request
 74  * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
 75  * @link_cong: non-zero if owner must sleep because of link congestion
 76  * @sent_unacked: # messages sent by socket, and not yet acked by peer
 77  * @rcv_unacked: # messages read by user, but not yet acked back to peer
 78  * @peer: 'connected' peer for dgram/rdm
 79  * @node: hash table node
 80  * @rcu: rcu struct for tipc_sock
 81  */
 82 struct tipc_sock {
 83         struct sock sk;
 84         u32 conn_type;
 85         u32 conn_instance;
 86         int published;
 87         u32 max_pkt;
 88         u32 portid;
 89         struct tipc_msg phdr;
 90         struct list_head sock_list;
 91         struct list_head publications;
 92         u32 pub_count;
 93         uint conn_timeout;
 94         atomic_t dupl_rcvcnt;
 95         bool probe_unacked;
 96         bool link_cong;
 97         u16 snt_unacked;
 98         u16 snd_win;
 99         u16 peer_caps;
100         u16 rcv_unacked;
101         u16 rcv_win;
102         struct sockaddr_tipc peer;
103         struct rhash_head node;
104         struct rcu_head rcu;
105 };
106 
107 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
108 static void tipc_data_ready(struct sock *sk);
109 static void tipc_write_space(struct sock *sk);
110 static void tipc_sock_destruct(struct sock *sk);
111 static int tipc_release(struct socket *sock);
112 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
113 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
114 static void tipc_sk_timeout(unsigned long data);
115 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
116                            struct tipc_name_seq const *seq);
117 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
118                             struct tipc_name_seq const *seq);
119 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
120 static int tipc_sk_insert(struct tipc_sock *tsk);
121 static void tipc_sk_remove(struct tipc_sock *tsk);
122 static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
123                               size_t dsz);
124 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
125 
126 static const struct proto_ops packet_ops;
127 static const struct proto_ops stream_ops;
128 static const struct proto_ops msg_ops;
129 static struct proto tipc_proto;
130 static const struct rhashtable_params tsk_rht_params;
131 
132 static u32 tsk_own_node(struct tipc_sock *tsk)
133 {
134         return msg_prevnode(&tsk->phdr);
135 }
136 
137 static u32 tsk_peer_node(struct tipc_sock *tsk)
138 {
139         return msg_destnode(&tsk->phdr);
140 }
141 
142 static u32 tsk_peer_port(struct tipc_sock *tsk)
143 {
144         return msg_destport(&tsk->phdr);
145 }
146 
147 static  bool tsk_unreliable(struct tipc_sock *tsk)
148 {
149         return msg_src_droppable(&tsk->phdr) != 0;
150 }
151 
152 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
153 {
154         msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
155 }
156 
157 static bool tsk_unreturnable(struct tipc_sock *tsk)
158 {
159         return msg_dest_droppable(&tsk->phdr) != 0;
160 }
161 
162 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
163 {
164         msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
165 }
166 
167 static int tsk_importance(struct tipc_sock *tsk)
168 {
169         return msg_importance(&tsk->phdr);
170 }
171 
172 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
173 {
174         if (imp > TIPC_CRITICAL_IMPORTANCE)
175                 return -EINVAL;
176         msg_set_importance(&tsk->phdr, (u32)imp);
177         return 0;
178 }
179 
180 static struct tipc_sock *tipc_sk(const struct sock *sk)
181 {
182         return container_of(sk, struct tipc_sock, sk);
183 }
184 
185 static bool tsk_conn_cong(struct tipc_sock *tsk)
186 {
187         return tsk->snt_unacked > tsk->snd_win;
188 }
189 
190 /* tsk_blocks(): translate a buffer size in bytes to number of
191  * advertisable blocks, taking into account the ratio truesize(len)/len
192  * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
193  */
194 static u16 tsk_adv_blocks(int len)
195 {
196         return len / FLOWCTL_BLK_SZ / 4;
197 }
198 
199 /* tsk_inc(): increment counter for sent or received data
200  * - If block based flow control is not supported by peer we
201  *   fall back to message based ditto, incrementing the counter
202  */
203 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
204 {
205         if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
206                 return ((msglen / FLOWCTL_BLK_SZ) + 1);
207         return 1;
208 }
209 
210 /**
211  * tsk_advance_rx_queue - discard first buffer in socket receive queue
212  *
213  * Caller must hold socket lock
214  */
215 static void tsk_advance_rx_queue(struct sock *sk)
216 {
217         kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
218 }
219 
220 /* tipc_sk_respond() : send response message back to sender
221  */
222 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
223 {
224         u32 selector;
225         u32 dnode;
226         u32 onode = tipc_own_addr(sock_net(sk));
227 
228         if (!tipc_msg_reverse(onode, &skb, err))
229                 return;
230 
231         dnode = msg_destnode(buf_msg(skb));
232         selector = msg_origport(buf_msg(skb));
233         tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
234 }
235 
236 /**
237  * tsk_rej_rx_queue - reject all buffers in socket receive queue
238  *
239  * Caller must hold socket lock
240  */
241 static void tsk_rej_rx_queue(struct sock *sk)
242 {
243         struct sk_buff *skb;
244 
245         while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
246                 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
247 }
248 
249 static bool tipc_sk_connected(struct sock *sk)
250 {
251         return sk->sk_state == TIPC_ESTABLISHED;
252 }
253 
254 /* tipc_sk_type_connectionless - check if the socket is datagram socket
255  * @sk: socket
256  *
257  * Returns true if connection less, false otherwise
258  */
259 static bool tipc_sk_type_connectionless(struct sock *sk)
260 {
261         return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
262 }
263 
264 /* tsk_peer_msg - verify if message was sent by connected port's peer
265  *
266  * Handles cases where the node's network address has changed from
267  * the default of <0.0.0> to its configured setting.
268  */
269 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
270 {
271         struct sock *sk = &tsk->sk;
272         struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
273         u32 peer_port = tsk_peer_port(tsk);
274         u32 orig_node;
275         u32 peer_node;
276 
277         if (unlikely(!tipc_sk_connected(sk)))
278                 return false;
279 
280         if (unlikely(msg_origport(msg) != peer_port))
281                 return false;
282 
283         orig_node = msg_orignode(msg);
284         peer_node = tsk_peer_node(tsk);
285 
286         if (likely(orig_node == peer_node))
287                 return true;
288 
289         if (!orig_node && (peer_node == tn->own_addr))
290                 return true;
291 
292         if (!peer_node && (orig_node == tn->own_addr))
293                 return true;
294 
295         return false;
296 }
297 
298 /* tipc_set_sk_state - set the sk_state of the socket
299  * @sk: socket
300  *
301  * Caller must hold socket lock
302  *
303  * Returns 0 on success, errno otherwise
304  */
305 static int tipc_set_sk_state(struct sock *sk, int state)
306 {
307         int oldsk_state = sk->sk_state;
308         int res = -EINVAL;
309 
310         switch (state) {
311         case TIPC_OPEN:
312                 res = 0;
313                 break;
314         case TIPC_LISTEN:
315         case TIPC_CONNECTING:
316                 if (oldsk_state == TIPC_OPEN)
317                         res = 0;
318                 break;
319         case TIPC_ESTABLISHED:
320                 if (oldsk_state == TIPC_CONNECTING ||
321                     oldsk_state == TIPC_OPEN)
322                         res = 0;
323                 break;
324         case TIPC_DISCONNECTING:
325                 if (oldsk_state == TIPC_CONNECTING ||
326                     oldsk_state == TIPC_ESTABLISHED)
327                         res = 0;
328                 break;
329         }
330 
331         if (!res)
332                 sk->sk_state = state;
333 
334         return res;
335 }
336 
337 /**
338  * tipc_sk_create - create a TIPC socket
339  * @net: network namespace (must be default network)
340  * @sock: pre-allocated socket structure
341  * @protocol: protocol indicator (must be 0)
342  * @kern: caused by kernel or by userspace?
343  *
344  * This routine creates additional data structures used by the TIPC socket,
345  * initializes them, and links them together.
346  *
347  * Returns 0 on success, errno otherwise
348  */
349 static int tipc_sk_create(struct net *net, struct socket *sock,
350                           int protocol, int kern)
351 {
352         struct tipc_net *tn;
353         const struct proto_ops *ops;
354         struct sock *sk;
355         struct tipc_sock *tsk;
356         struct tipc_msg *msg;
357 
358         /* Validate arguments */
359         if (unlikely(protocol != 0))
360                 return -EPROTONOSUPPORT;
361 
362         switch (sock->type) {
363         case SOCK_STREAM:
364                 ops = &stream_ops;
365                 break;
366         case SOCK_SEQPACKET:
367                 ops = &packet_ops;
368                 break;
369         case SOCK_DGRAM:
370         case SOCK_RDM:
371                 ops = &msg_ops;
372                 break;
373         default:
374                 return -EPROTOTYPE;
375         }
376 
377         /* Allocate socket's protocol area */
378         sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
379         if (sk == NULL)
380                 return -ENOMEM;
381 
382         tsk = tipc_sk(sk);
383         tsk->max_pkt = MAX_PKT_DEFAULT;
384         INIT_LIST_HEAD(&tsk->publications);
385         msg = &tsk->phdr;
386         tn = net_generic(sock_net(sk), tipc_net_id);
387         tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
388                       NAMED_H_SIZE, 0);
389 
390         /* Finish initializing socket data structures */
391         sock->ops = ops;
392         sock_init_data(sock, sk);
393         tipc_set_sk_state(sk, TIPC_OPEN);
394         if (tipc_sk_insert(tsk)) {
395                 pr_warn("Socket create failed; port number exhausted\n");
396                 return -EINVAL;
397         }
398         msg_set_origport(msg, tsk->portid);
399         setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
400         sk->sk_shutdown = 0;
401         sk->sk_backlog_rcv = tipc_backlog_rcv;
402         sk->sk_rcvbuf = sysctl_tipc_rmem[1];
403         sk->sk_data_ready = tipc_data_ready;
404         sk->sk_write_space = tipc_write_space;
405         sk->sk_destruct = tipc_sock_destruct;
406         tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
407         atomic_set(&tsk->dupl_rcvcnt, 0);
408 
409         /* Start out with safe limits until we receive an advertised window */
410         tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
411         tsk->rcv_win = tsk->snd_win;
412 
413         if (tipc_sk_type_connectionless(sk)) {
414                 tsk_set_unreturnable(tsk, true);
415                 if (sock->type == SOCK_DGRAM)
416                         tsk_set_unreliable(tsk, true);
417         }
418 
419         return 0;
420 }
421 
422 static void tipc_sk_callback(struct rcu_head *head)
423 {
424         struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
425 
426         sock_put(&tsk->sk);
427 }
428 
429 /* Caller should hold socket lock for the socket. */
430 static void __tipc_shutdown(struct socket *sock, int error)
431 {
432         struct sock *sk = sock->sk;
433         struct tipc_sock *tsk = tipc_sk(sk);
434         struct net *net = sock_net(sk);
435         u32 dnode = tsk_peer_node(tsk);
436         struct sk_buff *skb;
437 
438         /* Reject all unreceived messages, except on an active connection
439          * (which disconnects locally & sends a 'FIN+' to peer).
440          */
441         while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
442                 if (TIPC_SKB_CB(skb)->bytes_read) {
443                         kfree_skb(skb);
444                         continue;
445                 }
446                 if (!tipc_sk_type_connectionless(sk) &&
447                     sk->sk_state != TIPC_DISCONNECTING) {
448                         tipc_set_sk_state(sk, TIPC_DISCONNECTING);
449                         tipc_node_remove_conn(net, dnode, tsk->portid);
450                 }
451                 tipc_sk_respond(sk, skb, error);
452         }
453 
454         if (tipc_sk_type_connectionless(sk))
455                 return;
456 
457         if (sk->sk_state != TIPC_DISCONNECTING) {
458                 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
459                                       TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
460                                       tsk_own_node(tsk), tsk_peer_port(tsk),
461                                       tsk->portid, error);
462                 if (skb)
463                         tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
464                 tipc_node_remove_conn(net, dnode, tsk->portid);
465                 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
466         }
467 }
468 
469 /**
470  * tipc_release - destroy a TIPC socket
471  * @sock: socket to destroy
472  *
473  * This routine cleans up any messages that are still queued on the socket.
474  * For DGRAM and RDM socket types, all queued messages are rejected.
475  * For SEQPACKET and STREAM socket types, the first message is rejected
476  * and any others are discarded.  (If the first message on a STREAM socket
477  * is partially-read, it is discarded and the next one is rejected instead.)
478  *
479  * NOTE: Rejected messages are not necessarily returned to the sender!  They
480  * are returned or discarded according to the "destination droppable" setting
481  * specified for the message by the sender.
482  *
483  * Returns 0 on success, errno otherwise
484  */
485 static int tipc_release(struct socket *sock)
486 {
487         struct sock *sk = sock->sk;
488         struct tipc_sock *tsk;
489 
490         /*
491          * Exit if socket isn't fully initialized (occurs when a failed accept()
492          * releases a pre-allocated child socket that was never used)
493          */
494         if (sk == NULL)
495                 return 0;
496 
497         tsk = tipc_sk(sk);
498         lock_sock(sk);
499 
500         __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
501         sk->sk_shutdown = SHUTDOWN_MASK;
502         tipc_sk_withdraw(tsk, 0, NULL);
503         sk_stop_timer(sk, &sk->sk_timer);
504         tipc_sk_remove(tsk);
505 
506         /* Reject any messages that accumulated in backlog queue */
507         release_sock(sk);
508 
509         call_rcu(&tsk->rcu, tipc_sk_callback);
510         sock->sk = NULL;
511 
512         return 0;
513 }
514 
515 /**
516  * tipc_bind - associate or disassocate TIPC name(s) with a socket
517  * @sock: socket structure
518  * @uaddr: socket address describing name(s) and desired operation
519  * @uaddr_len: size of socket address data structure
520  *
521  * Name and name sequence binding is indicated using a positive scope value;
522  * a negative scope value unbinds the specified name.  Specifying no name
523  * (i.e. a socket address length of 0) unbinds all names from the socket.
524  *
525  * Returns 0 on success, errno otherwise
526  *
527  * NOTE: This routine doesn't need to take the socket lock since it doesn't
528  *       access any non-constant socket information.
529  */
530 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
531                      int uaddr_len)
532 {
533         struct sock *sk = sock->sk;
534         struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
535         struct tipc_sock *tsk = tipc_sk(sk);
536         int res = -EINVAL;
537 
538         lock_sock(sk);
539         if (unlikely(!uaddr_len)) {
540                 res = tipc_sk_withdraw(tsk, 0, NULL);
541                 goto exit;
542         }
543 
544         if (uaddr_len < sizeof(struct sockaddr_tipc)) {
545                 res = -EINVAL;
546                 goto exit;
547         }
548         if (addr->family != AF_TIPC) {
549                 res = -EAFNOSUPPORT;
550                 goto exit;
551         }
552 
553         if (addr->addrtype == TIPC_ADDR_NAME)
554                 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
555         else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
556                 res = -EAFNOSUPPORT;
557                 goto exit;
558         }
559 
560         if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
561             (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
562             (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
563                 res = -EACCES;
564                 goto exit;
565         }
566 
567         res = (addr->scope > 0) ?
568                 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
569                 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
570 exit:
571         release_sock(sk);
572         return res;
573 }
574 
575 /**
576  * tipc_getname - get port ID of socket or peer socket
577  * @sock: socket structure
578  * @uaddr: area for returned socket address
579  * @uaddr_len: area for returned length of socket address
580  * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
581  *
582  * Returns 0 on success, errno otherwise
583  *
584  * NOTE: This routine doesn't need to take the socket lock since it only
585  *       accesses socket information that is unchanging (or which changes in
586  *       a completely predictable manner).
587  */
588 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
589                         int *uaddr_len, int peer)
590 {
591         struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
592         struct sock *sk = sock->sk;
593         struct tipc_sock *tsk = tipc_sk(sk);
594         struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
595 
596         memset(addr, 0, sizeof(*addr));
597         if (peer) {
598                 if ((!tipc_sk_connected(sk)) &&
599                     ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
600                         return -ENOTCONN;
601                 addr->addr.id.ref = tsk_peer_port(tsk);
602                 addr->addr.id.node = tsk_peer_node(tsk);
603         } else {
604                 addr->addr.id.ref = tsk->portid;
605                 addr->addr.id.node = tn->own_addr;
606         }
607 
608         *uaddr_len = sizeof(*addr);
609         addr->addrtype = TIPC_ADDR_ID;
610         addr->family = AF_TIPC;
611         addr->scope = 0;
612         addr->addr.name.domain = 0;
613 
614         return 0;
615 }
616 
617 /**
618  * tipc_poll - read and possibly block on pollmask
619  * @file: file structure associated with the socket
620  * @sock: socket for which to calculate the poll bits
621  * @wait: ???
622  *
623  * Returns pollmask value
624  *
625  * COMMENTARY:
626  * It appears that the usual socket locking mechanisms are not useful here
627  * since the pollmask info is potentially out-of-date the moment this routine
628  * exits.  TCP and other protocols seem to rely on higher level poll routines
629  * to handle any preventable race conditions, so TIPC will do the same ...
630  *
631  * IMPORTANT: The fact that a read or write operation is indicated does NOT
632  * imply that the operation will succeed, merely that it should be performed
633  * and will not block.
634  */
635 static unsigned int tipc_poll(struct file *file, struct socket *sock,
636                               poll_table *wait)
637 {
638         struct sock *sk = sock->sk;
639         struct tipc_sock *tsk = tipc_sk(sk);
640         u32 mask = 0;
641 
642         sock_poll_wait(file, sk_sleep(sk), wait);
643 
644         if (sk->sk_shutdown & RCV_SHUTDOWN)
645                 mask |= POLLRDHUP | POLLIN | POLLRDNORM;
646         if (sk->sk_shutdown == SHUTDOWN_MASK)
647                 mask |= POLLHUP;
648 
649         switch (sk->sk_state) {
650         case TIPC_ESTABLISHED:
651                 if (!tsk->link_cong && !tsk_conn_cong(tsk))
652                         mask |= POLLOUT;
653                 /* fall thru' */
654         case TIPC_LISTEN:
655         case TIPC_CONNECTING:
656                 if (!skb_queue_empty(&sk->sk_receive_queue))
657                         mask |= (POLLIN | POLLRDNORM);
658                 break;
659         case TIPC_OPEN:
660                 if (!tsk->link_cong)
661                         mask |= POLLOUT;
662                 if (tipc_sk_type_connectionless(sk) &&
663                     (!skb_queue_empty(&sk->sk_receive_queue)))
664                         mask |= (POLLIN | POLLRDNORM);
665                 break;
666         case TIPC_DISCONNECTING:
667                 mask = (POLLIN | POLLRDNORM | POLLHUP);
668                 break;
669         }
670 
671         return mask;
672 }
673 
674 /**
675  * tipc_sendmcast - send multicast message
676  * @sock: socket structure
677  * @seq: destination address
678  * @msg: message to send
679  * @dsz: total length of message data
680  * @timeo: timeout to wait for wakeup
681  *
682  * Called from function tipc_sendmsg(), which has done all sanity checks
683  * Returns the number of bytes sent on success, or errno
684  */
685 static int tipc_sendmcast(struct  socket *sock, struct tipc_name_seq *seq,
686                           struct msghdr *msg, size_t dsz, long timeo)
687 {
688         struct sock *sk = sock->sk;
689         struct tipc_sock *tsk = tipc_sk(sk);
690         struct net *net = sock_net(sk);
691         struct tipc_msg *mhdr = &tsk->phdr;
692         struct sk_buff_head pktchain;
693         struct iov_iter save = msg->msg_iter;
694         uint mtu;
695         int rc;
696 
697         if (!timeo && tsk->link_cong)
698                 return -ELINKCONG;
699 
700         msg_set_type(mhdr, TIPC_MCAST_MSG);
701         msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
702         msg_set_destport(mhdr, 0);
703         msg_set_destnode(mhdr, 0);
704         msg_set_nametype(mhdr, seq->type);
705         msg_set_namelower(mhdr, seq->lower);
706         msg_set_nameupper(mhdr, seq->upper);
707         msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
708 
709         skb_queue_head_init(&pktchain);
710 
711 new_mtu:
712         mtu = tipc_bcast_get_mtu(net);
713         rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, &pktchain);
714         if (unlikely(rc < 0))
715                 return rc;
716 
717         do {
718                 rc = tipc_bcast_xmit(net, &pktchain);
719                 if (likely(!rc))
720                         return dsz;
721 
722                 if (rc == -ELINKCONG) {
723                         tsk->link_cong = 1;
724                         rc = tipc_wait_for_sndmsg(sock, &timeo);
725                         if (!rc)
726                                 continue;
727                 }
728                 __skb_queue_purge(&pktchain);
729                 if (rc == -EMSGSIZE) {
730                         msg->msg_iter = save;
731                         goto new_mtu;
732                 }
733                 break;
734         } while (1);
735         return rc;
736 }
737 
738 /**
739  * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
740  * @arrvq: queue with arriving messages, to be cloned after destination lookup
741  * @inputq: queue with cloned messages, delivered to socket after dest lookup
742  *
743  * Multi-threaded: parallel calls with reference to same queues may occur
744  */
745 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
746                        struct sk_buff_head *inputq)
747 {
748         struct tipc_msg *msg;
749         struct tipc_plist dports;
750         u32 portid;
751         u32 scope = TIPC_CLUSTER_SCOPE;
752         struct sk_buff_head tmpq;
753         uint hsz;
754         struct sk_buff *skb, *_skb;
755 
756         __skb_queue_head_init(&tmpq);
757         tipc_plist_init(&dports);
758 
759         skb = tipc_skb_peek(arrvq, &inputq->lock);
760         for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
761                 msg = buf_msg(skb);
762                 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
763 
764                 if (in_own_node(net, msg_orignode(msg)))
765                         scope = TIPC_NODE_SCOPE;
766 
767                 /* Create destination port list and message clones: */
768                 tipc_nametbl_mc_translate(net,
769                                           msg_nametype(msg), msg_namelower(msg),
770                                           msg_nameupper(msg), scope, &dports);
771                 portid = tipc_plist_pop(&dports);
772                 for (; portid; portid = tipc_plist_pop(&dports)) {
773                         _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
774                         if (_skb) {
775                                 msg_set_destport(buf_msg(_skb), portid);
776                                 __skb_queue_tail(&tmpq, _skb);
777                                 continue;
778                         }
779                         pr_warn("Failed to clone mcast rcv buffer\n");
780                 }
781                 /* Append to inputq if not already done by other thread */
782                 spin_lock_bh(&inputq->lock);
783                 if (skb_peek(arrvq) == skb) {
784                         skb_queue_splice_tail_init(&tmpq, inputq);
785                         kfree_skb(__skb_dequeue(arrvq));
786                 }
787                 spin_unlock_bh(&inputq->lock);
788                 __skb_queue_purge(&tmpq);
789                 kfree_skb(skb);
790         }
791         tipc_sk_rcv(net, inputq);
792 }
793 
794 /**
795  * tipc_sk_proto_rcv - receive a connection mng protocol message
796  * @tsk: receiving socket
797  * @skb: pointer to message buffer.
798  */
799 static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
800                               struct sk_buff_head *xmitq)
801 {
802         struct sock *sk = &tsk->sk;
803         u32 onode = tsk_own_node(tsk);
804         struct tipc_msg *hdr = buf_msg(skb);
805         int mtyp = msg_type(hdr);
806         bool conn_cong;
807 
808         /* Ignore if connection cannot be validated: */
809         if (!tsk_peer_msg(tsk, hdr))
810                 goto exit;
811 
812         tsk->probe_unacked = false;
813 
814         if (mtyp == CONN_PROBE) {
815                 msg_set_type(hdr, CONN_PROBE_REPLY);
816                 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
817                         __skb_queue_tail(xmitq, skb);
818                 return;
819         } else if (mtyp == CONN_ACK) {
820                 conn_cong = tsk_conn_cong(tsk);
821                 tsk->snt_unacked -= msg_conn_ack(hdr);
822                 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
823                         tsk->snd_win = msg_adv_win(hdr);
824                 if (conn_cong)
825                         sk->sk_write_space(sk);
826         } else if (mtyp != CONN_PROBE_REPLY) {
827                 pr_warn("Received unknown CONN_PROTO msg\n");
828         }
829 exit:
830         kfree_skb(skb);
831 }
832 
833 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
834 {
835         DEFINE_WAIT_FUNC(wait, woken_wake_function);
836         struct sock *sk = sock->sk;
837         struct tipc_sock *tsk = tipc_sk(sk);
838         int done;
839 
840         do {
841                 int err = sock_error(sk);
842                 if (err)
843                         return err;
844                 if (sk->sk_shutdown & SEND_SHUTDOWN)
845                         return -EPIPE;
846                 if (!*timeo_p)
847                         return -EAGAIN;
848                 if (signal_pending(current))
849                         return sock_intr_errno(*timeo_p);
850 
851                 add_wait_queue(sk_sleep(sk), &wait);
852                 done = sk_wait_event(sk, timeo_p, !tsk->link_cong, &wait);
853                 remove_wait_queue(sk_sleep(sk), &wait);
854         } while (!done);
855         return 0;
856 }
857 
858 /**
859  * tipc_sendmsg - send message in connectionless manner
860  * @sock: socket structure
861  * @m: message to send
862  * @dsz: amount of user data to be sent
863  *
864  * Message must have an destination specified explicitly.
865  * Used for SOCK_RDM and SOCK_DGRAM messages,
866  * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
867  * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
868  *
869  * Returns the number of bytes sent on success, or errno otherwise
870  */
871 static int tipc_sendmsg(struct socket *sock,
872                         struct msghdr *m, size_t dsz)
873 {
874         struct sock *sk = sock->sk;
875         int ret;
876 
877         lock_sock(sk);
878         ret = __tipc_sendmsg(sock, m, dsz);
879         release_sock(sk);
880 
881         return ret;
882 }
883 
884 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
885 {
886         DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
887         struct sock *sk = sock->sk;
888         struct tipc_sock *tsk = tipc_sk(sk);
889         struct net *net = sock_net(sk);
890         struct tipc_msg *mhdr = &tsk->phdr;
891         u32 dnode, dport;
892         struct sk_buff_head pktchain;
893         bool is_connectionless = tipc_sk_type_connectionless(sk);
894         struct sk_buff *skb;
895         struct tipc_name_seq *seq;
896         struct iov_iter save;
897         u32 mtu;
898         long timeo;
899         int rc;
900 
901         if (dsz > TIPC_MAX_USER_MSG_SIZE)
902                 return -EMSGSIZE;
903         if (unlikely(!dest)) {
904                 if (is_connectionless && tsk->peer.family == AF_TIPC)
905                         dest = &tsk->peer;
906                 else
907                         return -EDESTADDRREQ;
908         } else if (unlikely(m->msg_namelen < sizeof(*dest)) ||
909                    dest->family != AF_TIPC) {
910                 return -EINVAL;
911         }
912         if (!is_connectionless) {
913                 if (sk->sk_state == TIPC_LISTEN)
914                         return -EPIPE;
915                 if (sk->sk_state != TIPC_OPEN)
916                         return -EISCONN;
917                 if (tsk->published)
918                         return -EOPNOTSUPP;
919                 if (dest->addrtype == TIPC_ADDR_NAME) {
920                         tsk->conn_type = dest->addr.name.name.type;
921                         tsk->conn_instance = dest->addr.name.name.instance;
922                 }
923         }
924         seq = &dest->addr.nameseq;
925         timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
926 
927         if (dest->addrtype == TIPC_ADDR_MCAST) {
928                 return tipc_sendmcast(sock, seq, m, dsz, timeo);
929         } else if (dest->addrtype == TIPC_ADDR_NAME) {
930                 u32 type = dest->addr.name.name.type;
931                 u32 inst = dest->addr.name.name.instance;
932                 u32 domain = dest->addr.name.domain;
933 
934                 dnode = domain;
935                 msg_set_type(mhdr, TIPC_NAMED_MSG);
936                 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
937                 msg_set_nametype(mhdr, type);
938                 msg_set_nameinst(mhdr, inst);
939                 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
940                 dport = tipc_nametbl_translate(net, type, inst, &dnode);
941                 msg_set_destnode(mhdr, dnode);
942                 msg_set_destport(mhdr, dport);
943                 if (unlikely(!dport && !dnode))
944                         return -EHOSTUNREACH;
945         } else if (dest->addrtype == TIPC_ADDR_ID) {
946                 dnode = dest->addr.id.node;
947                 msg_set_type(mhdr, TIPC_DIRECT_MSG);
948                 msg_set_lookup_scope(mhdr, 0);
949                 msg_set_destnode(mhdr, dnode);
950                 msg_set_destport(mhdr, dest->addr.id.ref);
951                 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
952         }
953 
954         skb_queue_head_init(&pktchain);
955         save = m->msg_iter;
956 new_mtu:
957         mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
958         rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &pktchain);
959         if (rc < 0)
960                 return rc;
961 
962         do {
963                 skb = skb_peek(&pktchain);
964                 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
965                 rc = tipc_node_xmit(net, &pktchain, dnode, tsk->portid);
966                 if (likely(!rc)) {
967                         if (!is_connectionless)
968                                 tipc_set_sk_state(sk, TIPC_CONNECTING);
969                         return dsz;
970                 }
971                 if (rc == -ELINKCONG) {
972                         tsk->link_cong = 1;
973                         rc = tipc_wait_for_sndmsg(sock, &timeo);
974                         if (!rc)
975                                 continue;
976                 }
977                 __skb_queue_purge(&pktchain);
978                 if (rc == -EMSGSIZE) {
979                         m->msg_iter = save;
980                         goto new_mtu;
981                 }
982                 break;
983         } while (1);
984 
985         return rc;
986 }
987 
988 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
989 {
990         DEFINE_WAIT_FUNC(wait, woken_wake_function);
991         struct sock *sk = sock->sk;
992         struct tipc_sock *tsk = tipc_sk(sk);
993         int done;
994 
995         do {
996                 int err = sock_error(sk);
997                 if (err)
998                         return err;
999                 if (sk->sk_state == TIPC_DISCONNECTING)
1000                         return -EPIPE;
1001                 else if (!tipc_sk_connected(sk))
1002                         return -ENOTCONN;
1003                 if (!*timeo_p)
1004                         return -EAGAIN;
1005                 if (signal_pending(current))
1006                         return sock_intr_errno(*timeo_p);
1007 
1008                 add_wait_queue(sk_sleep(sk), &wait);
1009                 done = sk_wait_event(sk, timeo_p,
1010                                      (!tsk->link_cong &&
1011                                       !tsk_conn_cong(tsk)) ||
1012                                       !tipc_sk_connected(sk), &wait);
1013                 remove_wait_queue(sk_sleep(sk), &wait);
1014         } while (!done);
1015         return 0;
1016 }
1017 
1018 /**
1019  * tipc_send_stream - send stream-oriented data
1020  * @sock: socket structure
1021  * @m: data to send
1022  * @dsz: total length of data to be transmitted
1023  *
1024  * Used for SOCK_STREAM data.
1025  *
1026  * Returns the number of bytes sent on success (or partial success),
1027  * or errno if no data sent
1028  */
1029 static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1030 {
1031         struct sock *sk = sock->sk;
1032         int ret;
1033 
1034         lock_sock(sk);
1035         ret = __tipc_send_stream(sock, m, dsz);
1036         release_sock(sk);
1037 
1038         return ret;
1039 }
1040 
1041 static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1042 {
1043         struct sock *sk = sock->sk;
1044         struct net *net = sock_net(sk);
1045         struct tipc_sock *tsk = tipc_sk(sk);
1046         struct tipc_msg *mhdr = &tsk->phdr;
1047         struct sk_buff_head pktchain;
1048         DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1049         u32 portid = tsk->portid;
1050         int rc = -EINVAL;
1051         long timeo;
1052         u32 dnode;
1053         uint mtu, send, sent = 0;
1054         struct iov_iter save;
1055         int hlen = MIN_H_SIZE;
1056 
1057         /* Handle implied connection establishment */
1058         if (unlikely(dest)) {
1059                 rc = __tipc_sendmsg(sock, m, dsz);
1060                 hlen = msg_hdr_sz(mhdr);
1061                 if (dsz && (dsz == rc))
1062                         tsk->snt_unacked = tsk_inc(tsk, dsz + hlen);
1063                 return rc;
1064         }
1065         if (dsz > (uint)INT_MAX)
1066                 return -EMSGSIZE;
1067 
1068         if (unlikely(!tipc_sk_connected(sk))) {
1069                 if (sk->sk_state == TIPC_DISCONNECTING)
1070                         return -EPIPE;
1071                 else
1072                         return -ENOTCONN;
1073         }
1074 
1075         timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1076         if (!timeo && tsk->link_cong)
1077                 return -ELINKCONG;
1078 
1079         dnode = tsk_peer_node(tsk);
1080         skb_queue_head_init(&pktchain);
1081 
1082 next:
1083         save = m->msg_iter;
1084         mtu = tsk->max_pkt;
1085         send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1086         rc = tipc_msg_build(mhdr, m, sent, send, mtu, &pktchain);
1087         if (unlikely(rc < 0))
1088                 return rc;
1089 
1090         do {
1091                 if (likely(!tsk_conn_cong(tsk))) {
1092                         rc = tipc_node_xmit(net, &pktchain, dnode, portid);
1093                         if (likely(!rc)) {
1094                                 tsk->snt_unacked += tsk_inc(tsk, send + hlen);
1095                                 sent += send;
1096                                 if (sent == dsz)
1097                                         return dsz;
1098                                 goto next;
1099                         }
1100                         if (rc == -EMSGSIZE) {
1101                                 __skb_queue_purge(&pktchain);
1102                                 tsk->max_pkt = tipc_node_get_mtu(net, dnode,
1103                                                                  portid);
1104                                 m->msg_iter = save;
1105                                 goto next;
1106                         }
1107                         if (rc != -ELINKCONG)
1108                                 break;
1109 
1110                         tsk->link_cong = 1;
1111                 }
1112                 rc = tipc_wait_for_sndpkt(sock, &timeo);
1113         } while (!rc);
1114 
1115         __skb_queue_purge(&pktchain);
1116         return sent ? sent : rc;
1117 }
1118 
1119 /**
1120  * tipc_send_packet - send a connection-oriented message
1121  * @sock: socket structure
1122  * @m: message to send
1123  * @dsz: length of data to be transmitted
1124  *
1125  * Used for SOCK_SEQPACKET messages.
1126  *
1127  * Returns the number of bytes sent on success, or errno otherwise
1128  */
1129 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1130 {
1131         if (dsz > TIPC_MAX_USER_MSG_SIZE)
1132                 return -EMSGSIZE;
1133 
1134         return tipc_send_stream(sock, m, dsz);
1135 }
1136 
1137 /* tipc_sk_finish_conn - complete the setup of a connection
1138  */
1139 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1140                                 u32 peer_node)
1141 {
1142         struct sock *sk = &tsk->sk;
1143         struct net *net = sock_net(sk);
1144         struct tipc_msg *msg = &tsk->phdr;
1145 
1146         msg_set_destnode(msg, peer_node);
1147         msg_set_destport(msg, peer_port);
1148         msg_set_type(msg, TIPC_CONN_MSG);
1149         msg_set_lookup_scope(msg, 0);
1150         msg_set_hdr_sz(msg, SHORT_H_SIZE);
1151 
1152         sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTERVAL);
1153         tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1154         tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1155         tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1156         tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1157         if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1158                 return;
1159 
1160         /* Fall back to message based flow control */
1161         tsk->rcv_win = FLOWCTL_MSG_WIN;
1162         tsk->snd_win = FLOWCTL_MSG_WIN;
1163 }
1164 
1165 /**
1166  * set_orig_addr - capture sender's address for received message
1167  * @m: descriptor for message info
1168  * @msg: received message header
1169  *
1170  * Note: Address is not captured if not requested by receiver.
1171  */
1172 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1173 {
1174         DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1175 
1176         if (addr) {
1177                 addr->family = AF_TIPC;
1178                 addr->addrtype = TIPC_ADDR_ID;
1179                 memset(&addr->addr, 0, sizeof(addr->addr));
1180                 addr->addr.id.ref = msg_origport(msg);
1181                 addr->addr.id.node = msg_orignode(msg);
1182                 addr->addr.name.domain = 0;     /* could leave uninitialized */
1183                 addr->scope = 0;                /* could leave uninitialized */
1184                 m->msg_namelen = sizeof(struct sockaddr_tipc);
1185         }
1186 }
1187 
1188 /**
1189  * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1190  * @m: descriptor for message info
1191  * @msg: received message header
1192  * @tsk: TIPC port associated with message
1193  *
1194  * Note: Ancillary data is not captured if not requested by receiver.
1195  *
1196  * Returns 0 if successful, otherwise errno
1197  */
1198 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1199                                  struct tipc_sock *tsk)
1200 {
1201         u32 anc_data[3];
1202         u32 err;
1203         u32 dest_type;
1204         int has_name;
1205         int res;
1206 
1207         if (likely(m->msg_controllen == 0))
1208                 return 0;
1209 
1210         /* Optionally capture errored message object(s) */
1211         err = msg ? msg_errcode(msg) : 0;
1212         if (unlikely(err)) {
1213                 anc_data[0] = err;
1214                 anc_data[1] = msg_data_sz(msg);
1215                 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1216                 if (res)
1217                         return res;
1218                 if (anc_data[1]) {
1219                         res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1220                                        msg_data(msg));
1221                         if (res)
1222                                 return res;
1223                 }
1224         }
1225 
1226         /* Optionally capture message destination object */
1227         dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1228         switch (dest_type) {
1229         case TIPC_NAMED_MSG:
1230                 has_name = 1;
1231                 anc_data[0] = msg_nametype(msg);
1232                 anc_data[1] = msg_namelower(msg);
1233                 anc_data[2] = msg_namelower(msg);
1234                 break;
1235         case TIPC_MCAST_MSG:
1236                 has_name = 1;
1237                 anc_data[0] = msg_nametype(msg);
1238                 anc_data[1] = msg_namelower(msg);
1239                 anc_data[2] = msg_nameupper(msg);
1240                 break;
1241         case TIPC_CONN_MSG:
1242                 has_name = (tsk->conn_type != 0);
1243                 anc_data[0] = tsk->conn_type;
1244                 anc_data[1] = tsk->conn_instance;
1245                 anc_data[2] = tsk->conn_instance;
1246                 break;
1247         default:
1248                 has_name = 0;
1249         }
1250         if (has_name) {
1251                 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1252                 if (res)
1253                         return res;
1254         }
1255 
1256         return 0;
1257 }
1258 
1259 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1260 {
1261         struct sock *sk = &tsk->sk;
1262         struct net *net = sock_net(sk);
1263         struct sk_buff *skb = NULL;
1264         struct tipc_msg *msg;
1265         u32 peer_port = tsk_peer_port(tsk);
1266         u32 dnode = tsk_peer_node(tsk);
1267 
1268         if (!tipc_sk_connected(sk))
1269                 return;
1270         skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1271                               dnode, tsk_own_node(tsk), peer_port,
1272                               tsk->portid, TIPC_OK);
1273         if (!skb)
1274                 return;
1275         msg = buf_msg(skb);
1276         msg_set_conn_ack(msg, tsk->rcv_unacked);
1277         tsk->rcv_unacked = 0;
1278 
1279         /* Adjust to and advertize the correct window limit */
1280         if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1281                 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1282                 msg_set_adv_win(msg, tsk->rcv_win);
1283         }
1284         tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1285 }
1286 
1287 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1288 {
1289         struct sock *sk = sock->sk;
1290         DEFINE_WAIT(wait);
1291         long timeo = *timeop;
1292         int err;
1293 
1294         for (;;) {
1295                 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1296                 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1297                         if (sk->sk_shutdown & RCV_SHUTDOWN) {
1298                                 err = -ENOTCONN;
1299                                 break;
1300                         }
1301                         release_sock(sk);
1302                         timeo = schedule_timeout(timeo);
1303                         lock_sock(sk);
1304                 }
1305                 err = 0;
1306                 if (!skb_queue_empty(&sk->sk_receive_queue))
1307                         break;
1308                 err = -EAGAIN;
1309                 if (!timeo)
1310                         break;
1311                 err = sock_intr_errno(timeo);
1312                 if (signal_pending(current))
1313                         break;
1314         }
1315         finish_wait(sk_sleep(sk), &wait);
1316         *timeop = timeo;
1317         return err;
1318 }
1319 
1320 /**
1321  * tipc_recvmsg - receive packet-oriented message
1322  * @m: descriptor for message info
1323  * @buf_len: total size of user buffer area
1324  * @flags: receive flags
1325  *
1326  * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1327  * If the complete message doesn't fit in user area, truncate it.
1328  *
1329  * Returns size of returned message data, errno otherwise
1330  */
1331 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
1332                         int flags)
1333 {
1334         struct sock *sk = sock->sk;
1335         struct tipc_sock *tsk = tipc_sk(sk);
1336         struct sk_buff *buf;
1337         struct tipc_msg *msg;
1338         bool is_connectionless = tipc_sk_type_connectionless(sk);
1339         long timeo;
1340         unsigned int sz;
1341         u32 err;
1342         int res, hlen;
1343 
1344         /* Catch invalid receive requests */
1345         if (unlikely(!buf_len))
1346                 return -EINVAL;
1347 
1348         lock_sock(sk);
1349 
1350         if (!is_connectionless && unlikely(sk->sk_state == TIPC_OPEN)) {
1351                 res = -ENOTCONN;
1352                 goto exit;
1353         }
1354 
1355         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1356 restart:
1357 
1358         /* Look for a message in receive queue; wait if necessary */
1359         res = tipc_wait_for_rcvmsg(sock, &timeo);
1360         if (res)
1361                 goto exit;
1362 
1363         /* Look at first message in receive queue */
1364         buf = skb_peek(&sk->sk_receive_queue);
1365         msg = buf_msg(buf);
1366         sz = msg_data_sz(msg);
1367         hlen = msg_hdr_sz(msg);
1368         err = msg_errcode(msg);
1369 
1370         /* Discard an empty non-errored message & try again */
1371         if ((!sz) && (!err)) {
1372                 tsk_advance_rx_queue(sk);
1373                 goto restart;
1374         }
1375 
1376         /* Capture sender's address (optional) */
1377         set_orig_addr(m, msg);
1378 
1379         /* Capture ancillary data (optional) */
1380         res = tipc_sk_anc_data_recv(m, msg, tsk);
1381         if (res)
1382                 goto exit;
1383 
1384         /* Capture message data (if valid) & compute return value (always) */
1385         if (!err) {
1386                 if (unlikely(buf_len < sz)) {
1387                         sz = buf_len;
1388                         m->msg_flags |= MSG_TRUNC;
1389                 }
1390                 res = skb_copy_datagram_msg(buf, hlen, m, sz);
1391                 if (res)
1392                         goto exit;
1393                 res = sz;
1394         } else {
1395                 if (is_connectionless || err == TIPC_CONN_SHUTDOWN ||
1396                     m->msg_control)
1397                         res = 0;
1398                 else
1399                         res = -ECONNRESET;
1400         }
1401 
1402         if (unlikely(flags & MSG_PEEK))
1403                 goto exit;
1404 
1405         if (likely(!is_connectionless)) {
1406                 tsk->rcv_unacked += tsk_inc(tsk, hlen + sz);
1407                 if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4)))
1408                         tipc_sk_send_ack(tsk);
1409         }
1410         tsk_advance_rx_queue(sk);
1411 exit:
1412         release_sock(sk);
1413         return res;
1414 }
1415 
1416 /**
1417  * tipc_recv_stream - receive stream-oriented data
1418  * @m: descriptor for message info
1419  * @buf_len: total size of user buffer area
1420  * @flags: receive flags
1421  *
1422  * Used for SOCK_STREAM messages only.  If not enough data is available
1423  * will optionally wait for more; never truncates data.
1424  *
1425  * Returns size of returned message data, errno otherwise
1426  */
1427 static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
1428                             size_t buf_len, int flags)
1429 {
1430         struct sock *sk = sock->sk;
1431         struct tipc_sock *tsk = tipc_sk(sk);
1432         struct sk_buff *buf;
1433         struct tipc_msg *msg;
1434         long timeo;
1435         unsigned int sz;
1436         int target;
1437         int sz_copied = 0;
1438         u32 err;
1439         int res = 0, hlen;
1440 
1441         /* Catch invalid receive attempts */
1442         if (unlikely(!buf_len))
1443                 return -EINVAL;
1444 
1445         lock_sock(sk);
1446 
1447         if (unlikely(sk->sk_state == TIPC_OPEN)) {
1448                 res = -ENOTCONN;
1449                 goto exit;
1450         }
1451 
1452         target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1453         timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1454 
1455 restart:
1456         /* Look for a message in receive queue; wait if necessary */
1457         res = tipc_wait_for_rcvmsg(sock, &timeo);
1458         if (res)
1459                 goto exit;
1460 
1461         /* Look at first message in receive queue */
1462         buf = skb_peek(&sk->sk_receive_queue);
1463         msg = buf_msg(buf);
1464         sz = msg_data_sz(msg);
1465         hlen = msg_hdr_sz(msg);
1466         err = msg_errcode(msg);
1467 
1468         /* Discard an empty non-errored message & try again */
1469         if ((!sz) && (!err)) {
1470                 tsk_advance_rx_queue(sk);
1471                 goto restart;
1472         }
1473 
1474         /* Optionally capture sender's address & ancillary data of first msg */
1475         if (sz_copied == 0) {
1476                 set_orig_addr(m, msg);
1477                 res = tipc_sk_anc_data_recv(m, msg, tsk);
1478                 if (res)
1479                         goto exit;
1480         }
1481 
1482         /* Capture message data (if valid) & compute return value (always) */
1483         if (!err) {
1484                 u32 offset = TIPC_SKB_CB(buf)->bytes_read;
1485                 u32 needed;
1486                 int sz_to_copy;
1487 
1488                 sz -= offset;
1489                 needed = (buf_len - sz_copied);
1490                 sz_to_copy = min(sz, needed);
1491 
1492                 res = skb_copy_datagram_msg(buf, hlen + offset, m, sz_to_copy);
1493                 if (res)
1494                         goto exit;
1495 
1496                 sz_copied += sz_to_copy;
1497 
1498                 if (sz_to_copy < sz) {
1499                         if (!(flags & MSG_PEEK))
1500                                 TIPC_SKB_CB(buf)->bytes_read =
1501                                         offset + sz_to_copy;
1502                         goto exit;
1503                 }
1504         } else {
1505                 if (sz_copied != 0)
1506                         goto exit; /* can't add error msg to valid data */
1507 
1508                 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1509                         res = 0;
1510                 else
1511                         res = -ECONNRESET;
1512         }
1513 
1514         if (unlikely(flags & MSG_PEEK))
1515                 goto exit;
1516 
1517         tsk->rcv_unacked += tsk_inc(tsk, hlen + sz);
1518         if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4)))
1519                 tipc_sk_send_ack(tsk);
1520         tsk_advance_rx_queue(sk);
1521 
1522         /* Loop around if more data is required */
1523         if ((sz_copied < buf_len) &&    /* didn't get all requested data */
1524             (!skb_queue_empty(&sk->sk_receive_queue) ||
1525             (sz_copied < target)) &&    /* and more is ready or required */
1526             (!err))                     /* and haven't reached a FIN */
1527                 goto restart;
1528 
1529 exit:
1530         release_sock(sk);
1531         return sz_copied ? sz_copied : res;
1532 }
1533 
1534 /**
1535  * tipc_write_space - wake up thread if port congestion is released
1536  * @sk: socket
1537  */
1538 static void tipc_write_space(struct sock *sk)
1539 {
1540         struct socket_wq *wq;
1541 
1542         rcu_read_lock();
1543         wq = rcu_dereference(sk->sk_wq);
1544         if (skwq_has_sleeper(wq))
1545                 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1546                                                 POLLWRNORM | POLLWRBAND);
1547         rcu_read_unlock();
1548 }
1549 
1550 /**
1551  * tipc_data_ready - wake up threads to indicate messages have been received
1552  * @sk: socket
1553  * @len: the length of messages
1554  */
1555 static void tipc_data_ready(struct sock *sk)
1556 {
1557         struct socket_wq *wq;
1558 
1559         rcu_read_lock();
1560         wq = rcu_dereference(sk->sk_wq);
1561         if (skwq_has_sleeper(wq))
1562                 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1563                                                 POLLRDNORM | POLLRDBAND);
1564         rcu_read_unlock();
1565 }
1566 
1567 static void tipc_sock_destruct(struct sock *sk)
1568 {
1569         __skb_queue_purge(&sk->sk_receive_queue);
1570 }
1571 
1572 /**
1573  * filter_connect - Handle all incoming messages for a connection-based socket
1574  * @tsk: TIPC socket
1575  * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1576  *
1577  * Returns true if everything ok, false otherwise
1578  */
1579 static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
1580 {
1581         struct sock *sk = &tsk->sk;
1582         struct net *net = sock_net(sk);
1583         struct tipc_msg *hdr = buf_msg(skb);
1584 
1585         if (unlikely(msg_mcast(hdr)))
1586                 return false;
1587 
1588         switch (sk->sk_state) {
1589         case TIPC_CONNECTING:
1590                 /* Accept only ACK or NACK message */
1591                 if (unlikely(!msg_connected(hdr)))
1592                         return false;
1593 
1594                 if (unlikely(msg_errcode(hdr))) {
1595                         tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1596                         sk->sk_err = ECONNREFUSED;
1597                         return true;
1598                 }
1599 
1600                 if (unlikely(!msg_isdata(hdr))) {
1601                         tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1602                         sk->sk_err = EINVAL;
1603                         return true;
1604                 }
1605 
1606                 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
1607                 msg_set_importance(&tsk->phdr, msg_importance(hdr));
1608 
1609                 /* If 'ACK+' message, add to socket receive queue */
1610                 if (msg_data_sz(hdr))
1611                         return true;
1612 
1613                 /* If empty 'ACK-' message, wake up sleeping connect() */
1614                 if (waitqueue_active(sk_sleep(sk)))
1615                         wake_up_interruptible(sk_sleep(sk));
1616 
1617                 /* 'ACK-' message is neither accepted nor rejected: */
1618                 msg_set_dest_droppable(hdr, 1);
1619                 return false;
1620 
1621         case TIPC_OPEN:
1622         case TIPC_DISCONNECTING:
1623                 break;
1624         case TIPC_LISTEN:
1625                 /* Accept only SYN message */
1626                 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
1627                         return true;
1628                 break;
1629         case TIPC_ESTABLISHED:
1630                 /* Accept only connection-based messages sent by peer */
1631                 if (unlikely(!tsk_peer_msg(tsk, hdr)))
1632                         return false;
1633 
1634                 if (unlikely(msg_errcode(hdr))) {
1635                         tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1636                         /* Let timer expire on it's own */
1637                         tipc_node_remove_conn(net, tsk_peer_node(tsk),
1638                                               tsk->portid);
1639                         sk->sk_state_change(sk);
1640                 }
1641                 return true;
1642         default:
1643                 pr_err("Unknown sk_state %u\n", sk->sk_state);
1644         }
1645 
1646         return false;
1647 }
1648 
1649 /**
1650  * rcvbuf_limit - get proper overload limit of socket receive queue
1651  * @sk: socket
1652  * @skb: message
1653  *
1654  * For connection oriented messages, irrespective of importance,
1655  * default queue limit is 2 MB.
1656  *
1657  * For connectionless messages, queue limits are based on message
1658  * importance as follows:
1659  *
1660  * TIPC_LOW_IMPORTANCE       (2 MB)
1661  * TIPC_MEDIUM_IMPORTANCE    (4 MB)
1662  * TIPC_HIGH_IMPORTANCE      (8 MB)
1663  * TIPC_CRITICAL_IMPORTANCE  (16 MB)
1664  *
1665  * Returns overload limit according to corresponding message importance
1666  */
1667 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
1668 {
1669         struct tipc_sock *tsk = tipc_sk(sk);
1670         struct tipc_msg *hdr = buf_msg(skb);
1671 
1672         if (unlikely(!msg_connected(hdr)))
1673                 return sk->sk_rcvbuf << msg_importance(hdr);
1674 
1675         if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
1676                 return sk->sk_rcvbuf;
1677 
1678         return FLOWCTL_MSG_LIM;
1679 }
1680 
1681 /**
1682  * filter_rcv - validate incoming message
1683  * @sk: socket
1684  * @skb: pointer to message.
1685  *
1686  * Enqueues message on receive queue if acceptable; optionally handles
1687  * disconnect indication for a connected socket.
1688  *
1689  * Called with socket lock already taken
1690  *
1691  * Returns true if message was added to socket receive queue, otherwise false
1692  */
1693 static bool filter_rcv(struct sock *sk, struct sk_buff *skb,
1694                        struct sk_buff_head *xmitq)
1695 {
1696         struct tipc_sock *tsk = tipc_sk(sk);
1697         struct tipc_msg *hdr = buf_msg(skb);
1698         unsigned int limit = rcvbuf_limit(sk, skb);
1699         int err = TIPC_OK;
1700         int usr = msg_user(hdr);
1701 
1702         if (unlikely(msg_user(hdr) == CONN_MANAGER)) {
1703                 tipc_sk_proto_rcv(tsk, skb, xmitq);
1704                 return false;
1705         }
1706 
1707         if (unlikely(usr == SOCK_WAKEUP)) {
1708                 kfree_skb(skb);
1709                 tsk->link_cong = 0;
1710                 sk->sk_write_space(sk);
1711                 return false;
1712         }
1713 
1714         /* Drop if illegal message type */
1715         if (unlikely(msg_type(hdr) > TIPC_DIRECT_MSG)) {
1716                 kfree_skb(skb);
1717                 return false;
1718         }
1719 
1720         /* Reject if wrong message type for current socket state */
1721         if (tipc_sk_type_connectionless(sk)) {
1722                 if (msg_connected(hdr)) {
1723                         err = TIPC_ERR_NO_PORT;
1724                         goto reject;
1725                 }
1726         } else if (unlikely(!filter_connect(tsk, skb))) {
1727                 err = TIPC_ERR_NO_PORT;
1728                 goto reject;
1729         }
1730 
1731         /* Reject message if there isn't room to queue it */
1732         if (unlikely(sk_rmem_alloc_get(sk) + skb->truesize >= limit)) {
1733                 err = TIPC_ERR_OVERLOAD;
1734                 goto reject;
1735         }
1736 
1737         /* Enqueue message */
1738         TIPC_SKB_CB(skb)->bytes_read = 0;
1739         __skb_queue_tail(&sk->sk_receive_queue, skb);
1740         skb_set_owner_r(skb, sk);
1741 
1742         sk->sk_data_ready(sk);
1743         return true;
1744 
1745 reject:
1746         if (tipc_msg_reverse(tsk_own_node(tsk), &skb, err))
1747                 __skb_queue_tail(xmitq, skb);
1748         return false;
1749 }
1750 
1751 /**
1752  * tipc_backlog_rcv - handle incoming message from backlog queue
1753  * @sk: socket
1754  * @skb: message
1755  *
1756  * Caller must hold socket lock
1757  *
1758  * Returns 0
1759  */
1760 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1761 {
1762         unsigned int truesize = skb->truesize;
1763         struct sk_buff_head xmitq;
1764         u32 dnode, selector;
1765 
1766         __skb_queue_head_init(&xmitq);
1767 
1768         if (likely(filter_rcv(sk, skb, &xmitq))) {
1769                 atomic_add(truesize, &tipc_sk(sk)->dupl_rcvcnt);
1770                 return 0;
1771         }
1772 
1773         if (skb_queue_empty(&xmitq))
1774                 return 0;
1775 
1776         /* Send response/rejected message */
1777         skb = __skb_dequeue(&xmitq);
1778         dnode = msg_destnode(buf_msg(skb));
1779         selector = msg_origport(buf_msg(skb));
1780         tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
1781         return 0;
1782 }
1783 
1784 /**
1785  * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1786  *                   inputq and try adding them to socket or backlog queue
1787  * @inputq: list of incoming buffers with potentially different destinations
1788  * @sk: socket where the buffers should be enqueued
1789  * @dport: port number for the socket
1790  *
1791  * Caller must hold socket lock
1792  */
1793 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
1794                             u32 dport, struct sk_buff_head *xmitq)
1795 {
1796         unsigned long time_limit = jiffies + 2;
1797         struct sk_buff *skb;
1798         unsigned int lim;
1799         atomic_t *dcnt;
1800         u32 onode;
1801 
1802         while (skb_queue_len(inputq)) {
1803                 if (unlikely(time_after_eq(jiffies, time_limit)))
1804                         return;
1805 
1806                 skb = tipc_skb_dequeue(inputq, dport);
1807                 if (unlikely(!skb))
1808                         return;
1809 
1810                 /* Add message directly to receive queue if possible */
1811                 if (!sock_owned_by_user(sk)) {
1812                         filter_rcv(sk, skb, xmitq);
1813                         continue;
1814                 }
1815 
1816                 /* Try backlog, compensating for double-counted bytes */
1817                 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
1818                 if (!sk->sk_backlog.len)
1819                         atomic_set(dcnt, 0);
1820                 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
1821                 if (likely(!sk_add_backlog(sk, skb, lim)))
1822                         continue;
1823 
1824                 /* Overload => reject message back to sender */
1825                 onode = tipc_own_addr(sock_net(sk));
1826                 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
1827                         __skb_queue_tail(xmitq, skb);
1828                 break;
1829         }
1830 }
1831 
1832 /**
1833  * tipc_sk_rcv - handle a chain of incoming buffers
1834  * @inputq: buffer list containing the buffers
1835  * Consumes all buffers in list until inputq is empty
1836  * Note: may be called in multiple threads referring to the same queue
1837  */
1838 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
1839 {
1840         struct sk_buff_head xmitq;
1841         u32 dnode, dport = 0;
1842         int err;
1843         struct tipc_sock *tsk;
1844         struct sock *sk;
1845         struct sk_buff *skb;
1846 
1847         __skb_queue_head_init(&xmitq);
1848         while (skb_queue_len(inputq)) {
1849                 dport = tipc_skb_peek_port(inputq, dport);
1850                 tsk = tipc_sk_lookup(net, dport);
1851 
1852                 if (likely(tsk)) {
1853                         sk = &tsk->sk;
1854                         if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
1855                                 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
1856                                 spin_unlock_bh(&sk->sk_lock.slock);
1857                         }
1858                         /* Send pending response/rejected messages, if any */
1859                         while ((skb = __skb_dequeue(&xmitq))) {
1860                                 dnode = msg_destnode(buf_msg(skb));
1861                                 tipc_node_xmit_skb(net, skb, dnode, dport);
1862                         }
1863                         sock_put(sk);
1864                         continue;
1865                 }
1866 
1867                 /* No destination socket => dequeue skb if still there */
1868                 skb = tipc_skb_dequeue(inputq, dport);
1869                 if (!skb)
1870                         return;
1871 
1872                 /* Try secondary lookup if unresolved named message */
1873                 err = TIPC_ERR_NO_PORT;
1874                 if (tipc_msg_lookup_dest(net, skb, &err))
1875                         goto xmit;
1876 
1877                 /* Prepare for message rejection */
1878                 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
1879                         continue;
1880 xmit:
1881                 dnode = msg_destnode(buf_msg(skb));
1882                 tipc_node_xmit_skb(net, skb, dnode, dport);
1883         }
1884 }
1885 
1886 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1887 {
1888         DEFINE_WAIT_FUNC(wait, woken_wake_function);
1889         struct sock *sk = sock->sk;
1890         int done;
1891 
1892         do {
1893                 int err = sock_error(sk);
1894                 if (err)
1895                         return err;
1896                 if (!*timeo_p)
1897                         return -ETIMEDOUT;
1898                 if (signal_pending(current))
1899                         return sock_intr_errno(*timeo_p);
1900 
1901                 add_wait_queue(sk_sleep(sk), &wait);
1902                 done = sk_wait_event(sk, timeo_p,
1903                                      sk->sk_state != TIPC_CONNECTING, &wait);
1904                 remove_wait_queue(sk_sleep(sk), &wait);
1905         } while (!done);
1906         return 0;
1907 }
1908 
1909 /**
1910  * tipc_connect - establish a connection to another TIPC port
1911  * @sock: socket structure
1912  * @dest: socket address for destination port
1913  * @destlen: size of socket address data structure
1914  * @flags: file-related flags associated with socket
1915  *
1916  * Returns 0 on success, errno otherwise
1917  */
1918 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1919                         int destlen, int flags)
1920 {
1921         struct sock *sk = sock->sk;
1922         struct tipc_sock *tsk = tipc_sk(sk);
1923         struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1924         struct msghdr m = {NULL,};
1925         long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
1926         int previous;
1927         int res = 0;
1928 
1929         lock_sock(sk);
1930 
1931         /* DGRAM/RDM connect(), just save the destaddr */
1932         if (tipc_sk_type_connectionless(sk)) {
1933                 if (dst->family == AF_UNSPEC) {
1934                         memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
1935                 } else if (destlen != sizeof(struct sockaddr_tipc)) {
1936                         res = -EINVAL;
1937                 } else {
1938                         memcpy(&tsk->peer, dest, destlen);
1939                 }
1940                 goto exit;
1941         }
1942 
1943         /*
1944          * Reject connection attempt using multicast address
1945          *
1946          * Note: send_msg() validates the rest of the address fields,
1947          *       so there's no need to do it here
1948          */
1949         if (dst->addrtype == TIPC_ADDR_MCAST) {
1950                 res = -EINVAL;
1951                 goto exit;
1952         }
1953 
1954         previous = sk->sk_state;
1955 
1956         switch (sk->sk_state) {
1957         case TIPC_OPEN:
1958                 /* Send a 'SYN-' to destination */
1959                 m.msg_name = dest;
1960                 m.msg_namelen = destlen;
1961 
1962                 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1963                  * indicate send_msg() is never blocked.
1964                  */
1965                 if (!timeout)
1966                         m.msg_flags = MSG_DONTWAIT;
1967 
1968                 res = __tipc_sendmsg(sock, &m, 0);
1969                 if ((res < 0) && (res != -EWOULDBLOCK))
1970                         goto exit;
1971 
1972                 /* Just entered TIPC_CONNECTING state; the only
1973                  * difference is that return value in non-blocking
1974                  * case is EINPROGRESS, rather than EALREADY.
1975                  */
1976                 res = -EINPROGRESS;
1977                 /* fall thru' */
1978         case TIPC_CONNECTING:
1979                 if (!timeout) {
1980                         if (previous == TIPC_CONNECTING)
1981                                 res = -EALREADY;
1982                         goto exit;
1983                 }
1984                 timeout = msecs_to_jiffies(timeout);
1985                 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1986                 res = tipc_wait_for_connect(sock, &timeout);
1987                 break;
1988         case TIPC_ESTABLISHED:
1989                 res = -EISCONN;
1990                 break;
1991         default:
1992                 res = -EINVAL;
1993         }
1994 
1995 exit:
1996         release_sock(sk);
1997         return res;
1998 }
1999 
2000 /**
2001  * tipc_listen - allow socket to listen for incoming connections
2002  * @sock: socket structure
2003  * @len: (unused)
2004  *
2005  * Returns 0 on success, errno otherwise
2006  */
2007 static int tipc_listen(struct socket *sock, int len)
2008 {
2009         struct sock *sk = sock->sk;
2010         int res;
2011 
2012         lock_sock(sk);
2013         res = tipc_set_sk_state(sk, TIPC_LISTEN);
2014         release_sock(sk);
2015 
2016         return res;
2017 }
2018 
2019 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2020 {
2021         struct sock *sk = sock->sk;
2022         DEFINE_WAIT(wait);
2023         int err;
2024 
2025         /* True wake-one mechanism for incoming connections: only
2026          * one process gets woken up, not the 'whole herd'.
2027          * Since we do not 'race & poll' for established sockets
2028          * anymore, the common case will execute the loop only once.
2029         */
2030         for (;;) {
2031                 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2032                                           TASK_INTERRUPTIBLE);
2033                 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2034                         release_sock(sk);
2035                         timeo = schedule_timeout(timeo);
2036                         lock_sock(sk);
2037                 }
2038                 err = 0;
2039                 if (!skb_queue_empty(&sk->sk_receive_queue))
2040                         break;
2041                 err = -EAGAIN;
2042                 if (!timeo)
2043                         break;
2044                 err = sock_intr_errno(timeo);
2045                 if (signal_pending(current))
2046                         break;
2047         }
2048         finish_wait(sk_sleep(sk), &wait);
2049         return err;
2050 }
2051 
2052 /**
2053  * tipc_accept - wait for connection request
2054  * @sock: listening socket
2055  * @newsock: new socket that is to be connected
2056  * @flags: file-related flags associated with socket
2057  *
2058  * Returns 0 on success, errno otherwise
2059  */
2060 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
2061 {
2062         struct sock *new_sk, *sk = sock->sk;
2063         struct sk_buff *buf;
2064         struct tipc_sock *new_tsock;
2065         struct tipc_msg *msg;
2066         long timeo;
2067         int res;
2068 
2069         lock_sock(sk);
2070 
2071         if (sk->sk_state != TIPC_LISTEN) {
2072                 res = -EINVAL;
2073                 goto exit;
2074         }
2075         timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2076         res = tipc_wait_for_accept(sock, timeo);
2077         if (res)
2078                 goto exit;
2079 
2080         buf = skb_peek(&sk->sk_receive_queue);
2081 
2082         res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 0);
2083         if (res)
2084                 goto exit;
2085         security_sk_clone(sock->sk, new_sock->sk);
2086 
2087         new_sk = new_sock->sk;
2088         new_tsock = tipc_sk(new_sk);
2089         msg = buf_msg(buf);
2090 
2091         /* we lock on new_sk; but lockdep sees the lock on sk */
2092         lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2093 
2094         /*
2095          * Reject any stray messages received by new socket
2096          * before the socket lock was taken (very, very unlikely)
2097          */
2098         tsk_rej_rx_queue(new_sk);
2099 
2100         /* Connect new socket to it's peer */
2101         tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2102 
2103         tsk_set_importance(new_tsock, msg_importance(msg));
2104         if (msg_named(msg)) {
2105                 new_tsock->conn_type = msg_nametype(msg);
2106                 new_tsock->conn_instance = msg_nameinst(msg);
2107         }
2108 
2109         /*
2110          * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2111          * Respond to 'SYN+' by queuing it on new socket.
2112          */
2113         if (!msg_data_sz(msg)) {
2114                 struct msghdr m = {NULL,};
2115 
2116                 tsk_advance_rx_queue(sk);
2117                 __tipc_send_stream(new_sock, &m, 0);
2118         } else {
2119                 __skb_dequeue(&sk->sk_receive_queue);
2120                 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2121                 skb_set_owner_r(buf, new_sk);
2122         }
2123         release_sock(new_sk);
2124 exit:
2125         release_sock(sk);
2126         return res;
2127 }
2128 
2129 /**
2130  * tipc_shutdown - shutdown socket connection
2131  * @sock: socket structure
2132  * @how: direction to close (must be SHUT_RDWR)
2133  *
2134  * Terminates connection (if necessary), then purges socket's receive queue.
2135  *
2136  * Returns 0 on success, errno otherwise
2137  */
2138 static int tipc_shutdown(struct socket *sock, int how)
2139 {
2140         struct sock *sk = sock->sk;
2141         int res;
2142 
2143         if (how != SHUT_RDWR)
2144                 return -EINVAL;
2145 
2146         lock_sock(sk);
2147 
2148         __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2149         sk->sk_shutdown = SEND_SHUTDOWN;
2150 
2151         if (sk->sk_state == TIPC_DISCONNECTING) {
2152                 /* Discard any unreceived messages */
2153                 __skb_queue_purge(&sk->sk_receive_queue);
2154 
2155                 /* Wake up anyone sleeping in poll */
2156                 sk->sk_state_change(sk);
2157                 res = 0;
2158         } else {
2159                 res = -ENOTCONN;
2160         }
2161 
2162         release_sock(sk);
2163         return res;
2164 }
2165 
2166 static void tipc_sk_timeout(unsigned long data)
2167 {
2168         struct tipc_sock *tsk = (struct tipc_sock *)data;
2169         struct sock *sk = &tsk->sk;
2170         struct sk_buff *skb = NULL;
2171         u32 peer_port, peer_node;
2172         u32 own_node = tsk_own_node(tsk);
2173 
2174         bh_lock_sock(sk);
2175         if (!tipc_sk_connected(sk)) {
2176                 bh_unlock_sock(sk);
2177                 goto exit;
2178         }
2179         peer_port = tsk_peer_port(tsk);
2180         peer_node = tsk_peer_node(tsk);
2181 
2182         if (tsk->probe_unacked) {
2183                 if (!sock_owned_by_user(sk)) {
2184                         tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2185                         tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
2186                                               tsk_peer_port(tsk));
2187                         sk->sk_state_change(sk);
2188                 } else {
2189                         /* Try again later */
2190                         sk_reset_timer(sk, &sk->sk_timer, (HZ / 20));
2191                 }
2192 
2193                 bh_unlock_sock(sk);
2194                 goto exit;
2195         }
2196 
2197         skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE,
2198                               INT_H_SIZE, 0, peer_node, own_node,
2199                               peer_port, tsk->portid, TIPC_OK);
2200         tsk->probe_unacked = true;
2201         sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTERVAL);
2202         bh_unlock_sock(sk);
2203         if (skb)
2204                 tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
2205 exit:
2206         sock_put(sk);
2207 }
2208 
2209 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2210                            struct tipc_name_seq const *seq)
2211 {
2212         struct sock *sk = &tsk->sk;
2213         struct net *net = sock_net(sk);
2214         struct publication *publ;
2215         u32 key;
2216 
2217         if (tipc_sk_connected(sk))
2218                 return -EINVAL;
2219         key = tsk->portid + tsk->pub_count + 1;
2220         if (key == tsk->portid)
2221                 return -EADDRINUSE;
2222 
2223         publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2224                                     scope, tsk->portid, key);
2225         if (unlikely(!publ))
2226                 return -EINVAL;
2227 
2228         list_add(&publ->pport_list, &tsk->publications);
2229         tsk->pub_count++;
2230         tsk->published = 1;
2231         return 0;
2232 }
2233 
2234 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2235                             struct tipc_name_seq const *seq)
2236 {
2237         struct net *net = sock_net(&tsk->sk);
2238         struct publication *publ;
2239         struct publication *safe;
2240         int rc = -EINVAL;
2241 
2242         list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2243                 if (seq) {
2244                         if (publ->scope != scope)
2245                                 continue;
2246                         if (publ->type != seq->type)
2247                                 continue;
2248                         if (publ->lower != seq->lower)
2249                                 continue;
2250                         if (publ->upper != seq->upper)
2251                                 break;
2252                         tipc_nametbl_withdraw(net, publ->type, publ->lower,
2253                                               publ->ref, publ->key);
2254                         rc = 0;
2255                         break;
2256                 }
2257                 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2258                                       publ->ref, publ->key);
2259                 rc = 0;
2260         }
2261         if (list_empty(&tsk->publications))
2262                 tsk->published = 0;
2263         return rc;
2264 }
2265 
2266 /* tipc_sk_reinit: set non-zero address in all existing sockets
2267  *                 when we go from standalone to network mode.
2268  */
2269 void tipc_sk_reinit(struct net *net)
2270 {
2271         struct tipc_net *tn = net_generic(net, tipc_net_id);
2272         const struct bucket_table *tbl;
2273         struct rhash_head *pos;
2274         struct tipc_sock *tsk;
2275         struct tipc_msg *msg;
2276         int i;
2277 
2278         rcu_read_lock();
2279         tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2280         for (i = 0; i < tbl->size; i++) {
2281                 rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
2282                         spin_lock_bh(&tsk->sk.sk_lock.slock);
2283                         msg = &tsk->phdr;
2284                         msg_set_prevnode(msg, tn->own_addr);
2285                         msg_set_orignode(msg, tn->own_addr);
2286                         spin_unlock_bh(&tsk->sk.sk_lock.slock);
2287                 }
2288         }
2289         rcu_read_unlock();
2290 }
2291 
2292 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2293 {
2294         struct tipc_net *tn = net_generic(net, tipc_net_id);
2295         struct tipc_sock *tsk;
2296 
2297         rcu_read_lock();
2298         tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2299         if (tsk)
2300                 sock_hold(&tsk->sk);
2301         rcu_read_unlock();
2302 
2303         return tsk;
2304 }
2305 
2306 static int tipc_sk_insert(struct tipc_sock *tsk)
2307 {
2308         struct sock *sk = &tsk->sk;
2309         struct net *net = sock_net(sk);
2310         struct tipc_net *tn = net_generic(net, tipc_net_id);
2311         u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2312         u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2313 
2314         while (remaining--) {
2315                 portid++;
2316                 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2317                         portid = TIPC_MIN_PORT;
2318                 tsk->portid = portid;
2319                 sock_hold(&tsk->sk);
2320                 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2321                                                    tsk_rht_params))
2322                         return 0;
2323                 sock_put(&tsk->sk);
2324         }
2325 
2326         return -1;
2327 }
2328 
2329 static void tipc_sk_remove(struct tipc_sock *tsk)
2330 {
2331         struct sock *sk = &tsk->sk;
2332         struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2333 
2334         if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2335                 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
2336                 __sock_put(sk);
2337         }
2338 }
2339 
2340 static const struct rhashtable_params tsk_rht_params = {
2341         .nelem_hint = 192,
2342         .head_offset = offsetof(struct tipc_sock, node),
2343         .key_offset = offsetof(struct tipc_sock, portid),
2344         .key_len = sizeof(u32), /* portid */
2345         .max_size = 1048576,
2346         .min_size = 256,
2347         .automatic_shrinking = true,
2348 };
2349 
2350 int tipc_sk_rht_init(struct net *net)
2351 {
2352         struct tipc_net *tn = net_generic(net, tipc_net_id);
2353 
2354         return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2355 }
2356 
2357 void tipc_sk_rht_destroy(struct net *net)
2358 {
2359         struct tipc_net *tn = net_generic(net, tipc_net_id);
2360 
2361         /* Wait for socket readers to complete */
2362         synchronize_net();
2363 
2364         rhashtable_destroy(&tn->sk_rht);
2365 }
2366 
2367 /**
2368  * tipc_setsockopt - set socket option
2369  * @sock: socket structure
2370  * @lvl: option level
2371  * @opt: option identifier
2372  * @ov: pointer to new option value
2373  * @ol: length of option value
2374  *
2375  * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2376  * (to ease compatibility).
2377  *
2378  * Returns 0 on success, errno otherwise
2379  */
2380 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2381                            char __user *ov, unsigned int ol)
2382 {
2383         struct sock *sk = sock->sk;
2384         struct tipc_sock *tsk = tipc_sk(sk);
2385         u32 value;
2386         int res;
2387 
2388         if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2389                 return 0;
2390         if (lvl != SOL_TIPC)
2391                 return -ENOPROTOOPT;
2392         if (ol < sizeof(value))
2393                 return -EINVAL;
2394         res = get_user(value, (u32 __user *)ov);
2395         if (res)
2396                 return res;
2397 
2398         lock_sock(sk);
2399 
2400         switch (opt) {
2401         case TIPC_IMPORTANCE:
2402                 res = tsk_set_importance(tsk, value);
2403                 break;
2404         case TIPC_SRC_DROPPABLE:
2405                 if (sock->type != SOCK_STREAM)
2406                         tsk_set_unreliable(tsk, value);
2407                 else
2408                         res = -ENOPROTOOPT;
2409                 break;
2410         case TIPC_DEST_DROPPABLE:
2411                 tsk_set_unreturnable(tsk, value);
2412                 break;
2413         case TIPC_CONN_TIMEOUT:
2414                 tipc_sk(sk)->conn_timeout = value;
2415                 /* no need to set "res", since already 0 at this point */
2416                 break;
2417         default:
2418                 res = -EINVAL;
2419         }
2420 
2421         release_sock(sk);
2422 
2423         return res;
2424 }
2425 
2426 /**
2427  * tipc_getsockopt - get socket option
2428  * @sock: socket structure
2429  * @lvl: option level
2430  * @opt: option identifier
2431  * @ov: receptacle for option value
2432  * @ol: receptacle for length of option value
2433  *
2434  * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2435  * (to ease compatibility).
2436  *
2437  * Returns 0 on success, errno otherwise
2438  */
2439 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2440                            char __user *ov, int __user *ol)
2441 {
2442         struct sock *sk = sock->sk;
2443         struct tipc_sock *tsk = tipc_sk(sk);
2444         int len;
2445         u32 value;
2446         int res;
2447 
2448         if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2449                 return put_user(0, ol);
2450         if (lvl != SOL_TIPC)
2451                 return -ENOPROTOOPT;
2452         res = get_user(len, ol);
2453         if (res)
2454                 return res;
2455 
2456         lock_sock(sk);
2457 
2458         switch (opt) {
2459         case TIPC_IMPORTANCE:
2460                 value = tsk_importance(tsk);
2461                 break;
2462         case TIPC_SRC_DROPPABLE:
2463                 value = tsk_unreliable(tsk);
2464                 break;
2465         case TIPC_DEST_DROPPABLE:
2466                 value = tsk_unreturnable(tsk);
2467                 break;
2468         case TIPC_CONN_TIMEOUT:
2469                 value = tsk->conn_timeout;
2470                 /* no need to set "res", since already 0 at this point */
2471                 break;
2472         case TIPC_NODE_RECVQ_DEPTH:
2473                 value = 0; /* was tipc_queue_size, now obsolete */
2474                 break;
2475         case TIPC_SOCK_RECVQ_DEPTH:
2476                 value = skb_queue_len(&sk->sk_receive_queue);
2477                 break;
2478         default:
2479                 res = -EINVAL;
2480         }
2481 
2482         release_sock(sk);
2483 
2484         if (res)
2485                 return res;     /* "get" failed */
2486 
2487         if (len < sizeof(value))
2488                 return -EINVAL;
2489 
2490         if (copy_to_user(ov, &value, sizeof(value)))
2491                 return -EFAULT;
2492 
2493         return put_user(sizeof(value), ol);
2494 }
2495 
2496 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2497 {
2498         struct sock *sk = sock->sk;
2499         struct tipc_sioc_ln_req lnr;
2500         void __user *argp = (void __user *)arg;
2501 
2502         switch (cmd) {
2503         case SIOCGETLINKNAME:
2504                 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2505                         return -EFAULT;
2506                 if (!tipc_node_get_linkname(sock_net(sk),
2507                                             lnr.bearer_id & 0xffff, lnr.peer,
2508                                             lnr.linkname, TIPC_MAX_LINK_NAME)) {
2509                         if (copy_to_user(argp, &lnr, sizeof(lnr)))
2510                                 return -EFAULT;
2511                         return 0;
2512                 }
2513                 return -EADDRNOTAVAIL;
2514         default:
2515                 return -ENOIOCTLCMD;
2516         }
2517 }
2518 
2519 /* Protocol switches for the various types of TIPC sockets */
2520 
2521 static const struct proto_ops msg_ops = {
2522         .owner          = THIS_MODULE,
2523         .family         = AF_TIPC,
2524         .release        = tipc_release,
2525         .bind           = tipc_bind,
2526         .connect        = tipc_connect,
2527         .socketpair     = sock_no_socketpair,
2528         .accept         = sock_no_accept,
2529         .getname        = tipc_getname,
2530         .poll           = tipc_poll,
2531         .ioctl          = tipc_ioctl,
2532         .listen         = sock_no_listen,
2533         .shutdown       = tipc_shutdown,
2534         .setsockopt     = tipc_setsockopt,
2535         .getsockopt     = tipc_getsockopt,
2536         .sendmsg        = tipc_sendmsg,
2537         .recvmsg        = tipc_recvmsg,
2538         .mmap           = sock_no_mmap,
2539         .sendpage       = sock_no_sendpage
2540 };
2541 
2542 static const struct proto_ops packet_ops = {
2543         .owner          = THIS_MODULE,
2544         .family         = AF_TIPC,
2545         .release        = tipc_release,
2546         .bind           = tipc_bind,
2547         .connect        = tipc_connect,
2548         .socketpair     = sock_no_socketpair,
2549         .accept         = tipc_accept,
2550         .getname        = tipc_getname,
2551         .poll           = tipc_poll,
2552         .ioctl          = tipc_ioctl,
2553         .listen         = tipc_listen,
2554         .shutdown       = tipc_shutdown,
2555         .setsockopt     = tipc_setsockopt,
2556         .getsockopt     = tipc_getsockopt,
2557         .sendmsg        = tipc_send_packet,
2558         .recvmsg        = tipc_recvmsg,
2559         .mmap           = sock_no_mmap,
2560         .sendpage       = sock_no_sendpage
2561 };
2562 
2563 static const struct proto_ops stream_ops = {
2564         .owner          = THIS_MODULE,
2565         .family         = AF_TIPC,
2566         .release        = tipc_release,
2567         .bind           = tipc_bind,
2568         .connect        = tipc_connect,
2569         .socketpair     = sock_no_socketpair,
2570         .accept         = tipc_accept,
2571         .getname        = tipc_getname,
2572         .poll           = tipc_poll,
2573         .ioctl          = tipc_ioctl,
2574         .listen         = tipc_listen,
2575         .shutdown       = tipc_shutdown,
2576         .setsockopt     = tipc_setsockopt,
2577         .getsockopt     = tipc_getsockopt,
2578         .sendmsg        = tipc_send_stream,
2579         .recvmsg        = tipc_recv_stream,
2580         .mmap           = sock_no_mmap,
2581         .sendpage       = sock_no_sendpage
2582 };
2583 
2584 static const struct net_proto_family tipc_family_ops = {
2585         .owner          = THIS_MODULE,
2586         .family         = AF_TIPC,
2587         .create         = tipc_sk_create
2588 };
2589 
2590 static struct proto tipc_proto = {
2591         .name           = "TIPC",
2592         .owner          = THIS_MODULE,
2593         .obj_size       = sizeof(struct tipc_sock),
2594         .sysctl_rmem    = sysctl_tipc_rmem
2595 };
2596 
2597 /**
2598  * tipc_socket_init - initialize TIPC socket interface
2599  *
2600  * Returns 0 on success, errno otherwise
2601  */
2602 int tipc_socket_init(void)
2603 {
2604         int res;
2605 
2606         res = proto_register(&tipc_proto, 1);
2607         if (res) {
2608                 pr_err("Failed to register TIPC protocol type\n");
2609                 goto out;
2610         }
2611 
2612         res = sock_register(&tipc_family_ops);
2613         if (res) {
2614                 pr_err("Failed to register TIPC socket type\n");
2615                 proto_unregister(&tipc_proto);
2616                 goto out;
2617         }
2618  out:
2619         return res;
2620 }
2621 
2622 /**
2623  * tipc_socket_stop - stop TIPC socket interface
2624  */
2625 void tipc_socket_stop(void)
2626 {
2627         sock_unregister(tipc_family_ops.family);
2628         proto_unregister(&tipc_proto);
2629 }
2630 
2631 /* Caller should hold socket lock for the passed tipc socket. */
2632 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2633 {
2634         u32 peer_node;
2635         u32 peer_port;
2636         struct nlattr *nest;
2637 
2638         peer_node = tsk_peer_node(tsk);
2639         peer_port = tsk_peer_port(tsk);
2640 
2641         nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2642 
2643         if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2644                 goto msg_full;
2645         if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2646                 goto msg_full;
2647 
2648         if (tsk->conn_type != 0) {
2649                 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2650                         goto msg_full;
2651                 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2652                         goto msg_full;
2653                 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2654                         goto msg_full;
2655         }
2656         nla_nest_end(skb, nest);
2657 
2658         return 0;
2659 
2660 msg_full:
2661         nla_nest_cancel(skb, nest);
2662 
2663         return -EMSGSIZE;
2664 }
2665 
2666 /* Caller should hold socket lock for the passed tipc socket. */
2667 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2668                             struct tipc_sock *tsk)
2669 {
2670         int err;
2671         void *hdr;
2672         struct nlattr *attrs;
2673         struct net *net = sock_net(skb->sk);
2674         struct tipc_net *tn = net_generic(net, tipc_net_id);
2675         struct sock *sk = &tsk->sk;
2676 
2677         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2678                           &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2679         if (!hdr)
2680                 goto msg_cancel;
2681 
2682         attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2683         if (!attrs)
2684                 goto genlmsg_cancel;
2685         if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
2686                 goto attr_msg_cancel;
2687         if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
2688                 goto attr_msg_cancel;
2689 
2690         if (tipc_sk_connected(sk)) {
2691                 err = __tipc_nl_add_sk_con(skb, tsk);
2692                 if (err)
2693                         goto attr_msg_cancel;
2694         } else if (!list_empty(&tsk->publications)) {
2695                 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2696                         goto attr_msg_cancel;
2697         }
2698         nla_nest_end(skb, attrs);
2699         genlmsg_end(skb, hdr);
2700 
2701         return 0;
2702 
2703 attr_msg_cancel:
2704         nla_nest_cancel(skb, attrs);
2705 genlmsg_cancel:
2706         genlmsg_cancel(skb, hdr);
2707 msg_cancel:
2708         return -EMSGSIZE;
2709 }
2710 
2711 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2712 {
2713         int err;
2714         struct tipc_sock *tsk;
2715         const struct bucket_table *tbl;
2716         struct rhash_head *pos;
2717         struct net *net = sock_net(skb->sk);
2718         struct tipc_net *tn = net_generic(net, tipc_net_id);
2719         u32 tbl_id = cb->args[0];
2720         u32 prev_portid = cb->args[1];
2721 
2722         rcu_read_lock();
2723         tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2724         for (; tbl_id < tbl->size; tbl_id++) {
2725                 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
2726                         spin_lock_bh(&tsk->sk.sk_lock.slock);
2727                         if (prev_portid && prev_portid != tsk->portid) {
2728                                 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2729                                 continue;
2730                         }
2731 
2732                         err = __tipc_nl_add_sk(skb, cb, tsk);
2733                         if (err) {
2734                                 prev_portid = tsk->portid;
2735                                 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2736                                 goto out;
2737                         }
2738                         prev_portid = 0;
2739                         spin_unlock_bh(&tsk->sk.sk_lock.slock);
2740                 }
2741         }
2742 out:
2743         rcu_read_unlock();
2744         cb->args[0] = tbl_id;
2745         cb->args[1] = prev_portid;
2746 
2747         return skb->len;
2748 }
2749 
2750 /* Caller should hold socket lock for the passed tipc socket. */
2751 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2752                                  struct netlink_callback *cb,
2753                                  struct publication *publ)
2754 {
2755         void *hdr;
2756         struct nlattr *attrs;
2757 
2758         hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2759                           &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2760         if (!hdr)
2761                 goto msg_cancel;
2762 
2763         attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2764         if (!attrs)
2765                 goto genlmsg_cancel;
2766 
2767         if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2768                 goto attr_msg_cancel;
2769         if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2770                 goto attr_msg_cancel;
2771         if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2772                 goto attr_msg_cancel;
2773         if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2774                 goto attr_msg_cancel;
2775 
2776         nla_nest_end(skb, attrs);
2777         genlmsg_end(skb, hdr);
2778 
2779         return 0;
2780 
2781 attr_msg_cancel:
2782         nla_nest_cancel(skb, attrs);
2783 genlmsg_cancel:
2784         genlmsg_cancel(skb, hdr);
2785 msg_cancel:
2786         return -EMSGSIZE;
2787 }
2788 
2789 /* Caller should hold socket lock for the passed tipc socket. */
2790 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2791                                   struct netlink_callback *cb,
2792                                   struct tipc_sock *tsk, u32 *last_publ)
2793 {
2794         int err;
2795         struct publication *p;
2796 
2797         if (*last_publ) {
2798                 list_for_each_entry(p, &tsk->publications, pport_list) {
2799                         if (p->key == *last_publ)
2800                                 break;
2801                 }
2802                 if (p->key != *last_publ) {
2803                         /* We never set seq or call nl_dump_check_consistent()
2804                          * this means that setting prev_seq here will cause the
2805                          * consistence check to fail in the netlink callback
2806                          * handler. Resulting in the last NLMSG_DONE message
2807                          * having the NLM_F_DUMP_INTR flag set.
2808                          */
2809                         cb->prev_seq = 1;
2810                         *last_publ = 0;
2811                         return -EPIPE;
2812                 }
2813         } else {
2814                 p = list_first_entry(&tsk->publications, struct publication,
2815                                      pport_list);
2816         }
2817 
2818         list_for_each_entry_from(p, &tsk->publications, pport_list) {
2819                 err = __tipc_nl_add_sk_publ(skb, cb, p);
2820                 if (err) {
2821                         *last_publ = p->key;
2822                         return err;
2823                 }
2824         }
2825         *last_publ = 0;
2826 
2827         return 0;
2828 }
2829 
2830 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2831 {
2832         int err;
2833         u32 tsk_portid = cb->args[0];
2834         u32 last_publ = cb->args[1];
2835         u32 done = cb->args[2];
2836         struct net *net = sock_net(skb->sk);
2837         struct tipc_sock *tsk;
2838 
2839         if (!tsk_portid) {
2840                 struct nlattr **attrs;
2841                 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2842 
2843                 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2844                 if (err)
2845                         return err;
2846 
2847                 if (!attrs[TIPC_NLA_SOCK])
2848                         return -EINVAL;
2849 
2850                 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2851                                        attrs[TIPC_NLA_SOCK],
2852                                        tipc_nl_sock_policy);
2853                 if (err)
2854                         return err;
2855 
2856                 if (!sock[TIPC_NLA_SOCK_REF])
2857                         return -EINVAL;
2858 
2859                 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
2860         }
2861 
2862         if (done)
2863                 return 0;
2864 
2865         tsk = tipc_sk_lookup(net, tsk_portid);
2866         if (!tsk)
2867                 return -EINVAL;
2868 
2869         lock_sock(&tsk->sk);
2870         err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
2871         if (!err)
2872                 done = 1;
2873         release_sock(&tsk->sk);
2874         sock_put(&tsk->sk);
2875 
2876         cb->args[0] = tsk_portid;
2877         cb->args[1] = last_publ;
2878         cb->args[2] = done;
2879 
2880         return skb->len;
2881 }
2882 

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