blob: 69c29050f14abe8c926db671dfa05c96f2ddc3bc [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
Jon Paul Maloy02c00c22014-06-09 11:08:18 -05002 * net/tipc/socket.c: TIPC socket API
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Jon Paul Maloy3c724ac2015-02-05 08:36:43 -05004 * Copyright (c) 2001-2007, 2012-2015, Ericsson AB
Ying Xuec5fa7b32013-06-17 10:54:39 -04005 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
Ying Xue07f6c4b2015-01-07 13:41:58 +080037#include <linux/rhashtable.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010038#include "core.h"
Jon Paul Maloye2dafe82014-06-25 20:41:37 -050039#include "name_table.h"
Erik Hugne78acb1f2014-04-24 16:26:47 +020040#include "node.h"
Jon Paul Maloye2dafe82014-06-25 20:41:37 -050041#include "link.h"
Jon Paul Maloyc637c102015-02-05 08:36:41 -050042#include "name_distr.h"
Jon Paul Maloy2e84c602014-08-22 18:09:18 -040043#include "socket.h"
Jon Paul Maloya6bf70f2015-05-14 10:46:13 -040044#include "bcast.h"
Erik Hugne2cf8aa12012-06-29 00:16:37 -040045
Ying Xue07f6c4b2015-01-07 13:41:58 +080046#define SS_LISTENING -1 /* socket is listening */
47#define SS_READY -2 /* socket is connectionless */
Per Lidenb97bf3f2006-01-02 19:04:38 +010048
Ying Xue07f6c4b2015-01-07 13:41:58 +080049#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
Ying Xue2f55c432015-01-09 15:27:00 +080050#define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */
Ying Xue07f6c4b2015-01-07 13:41:58 +080051#define TIPC_FWD_MSG 1
52#define TIPC_CONN_OK 0
53#define TIPC_CONN_PROBING 1
54#define TIPC_MAX_PORT 0xffffffff
55#define TIPC_MIN_PORT 1
Jon Paul Maloy301bae52014-08-22 18:09:20 -040056
57/**
58 * struct tipc_sock - TIPC socket structure
59 * @sk: socket - interacts with 'port' and with user via the socket API
60 * @connected: non-zero if port is currently connected to a peer port
61 * @conn_type: TIPC type used when connection was established
62 * @conn_instance: TIPC instance used when connection was established
63 * @published: non-zero if port has one or more associated names
64 * @max_pkt: maximum packet size "hint" used when building messages sent by port
Ying Xue07f6c4b2015-01-07 13:41:58 +080065 * @portid: unique port identity in TIPC socket hash table
Jon Paul Maloy301bae52014-08-22 18:09:20 -040066 * @phdr: preformatted message header used when sending messages
67 * @port_list: adjacent ports in TIPC's global list of ports
68 * @publications: list of publications for port
69 * @pub_count: total # of publications port has made during its lifetime
70 * @probing_state:
Ying Xue2f55c432015-01-09 15:27:00 +080071 * @probing_intv:
Jon Paul Maloy301bae52014-08-22 18:09:20 -040072 * @conn_timeout: the time we can wait for an unresponded setup request
73 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
74 * @link_cong: non-zero if owner must sleep because of link congestion
75 * @sent_unacked: # messages sent by socket, and not yet acked by peer
76 * @rcv_unacked: # messages read by user, but not yet acked back to peer
Erik Hugnef2f80362015-03-19 09:02:19 +010077 * @remote: 'connected' peer for dgram/rdm
Ying Xue07f6c4b2015-01-07 13:41:58 +080078 * @node: hash table node
79 * @rcu: rcu struct for tipc_sock
Jon Paul Maloy301bae52014-08-22 18:09:20 -040080 */
81struct tipc_sock {
82 struct sock sk;
83 int connected;
84 u32 conn_type;
85 u32 conn_instance;
86 int published;
87 u32 max_pkt;
Ying Xue07f6c4b2015-01-07 13:41:58 +080088 u32 portid;
Jon Paul Maloy301bae52014-08-22 18:09:20 -040089 struct tipc_msg phdr;
90 struct list_head sock_list;
91 struct list_head publications;
92 u32 pub_count;
93 u32 probing_state;
Ying Xue2f55c432015-01-09 15:27:00 +080094 unsigned long probing_intv;
Jon Paul Maloy301bae52014-08-22 18:09:20 -040095 uint conn_timeout;
96 atomic_t dupl_rcvcnt;
97 bool link_cong;
98 uint sent_unacked;
99 uint rcv_unacked;
Erik Hugnef2f80362015-03-19 09:02:19 +0100100 struct sockaddr_tipc remote;
Ying Xue07f6c4b2015-01-07 13:41:58 +0800101 struct rhash_head node;
102 struct rcu_head rcu;
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400103};
Per Lidenb97bf3f2006-01-02 19:04:38 +0100104
Jon Paul Maloy4f4482d2014-05-14 05:39:09 -0400105static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
David S. Miller676d2362014-04-11 16:15:36 -0400106static void tipc_data_ready(struct sock *sk);
Ying Xuef288bef2012-08-21 11:16:57 +0800107static void tipc_write_space(struct sock *sk);
Ying Xuef4195d12015-11-22 15:46:05 +0800108static void tipc_sock_destruct(struct sock *sk);
Ying Xue247f0f32014-02-18 16:06:46 +0800109static int tipc_release(struct socket *sock);
110static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400111static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
Ying Xuef2f2a962015-01-09 15:27:02 +0800112static void tipc_sk_timeout(unsigned long data);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400113static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400114 struct tipc_name_seq const *seq);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400115static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400116 struct tipc_name_seq const *seq);
Ying Xuee05b31f2015-01-09 15:27:08 +0800117static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
Ying Xue07f6c4b2015-01-07 13:41:58 +0800118static int tipc_sk_insert(struct tipc_sock *tsk);
119static void tipc_sk_remove(struct tipc_sock *tsk);
Ying Xue39a02952015-03-02 15:37:47 +0800120static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
121 size_t dsz);
122static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100123
Florian Westphalbca65ea2008-02-07 18:18:01 -0800124static const struct proto_ops packet_ops;
125static const struct proto_ops stream_ops;
126static const struct proto_ops msg_ops;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100127static struct proto tipc_proto;
128
Richard Alpe1a1a1432014-11-20 10:29:11 +0100129static const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
130 [TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
131 [TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
132 [TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
133 [TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
134 [TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
135};
136
Herbert Xu6cca72892015-03-20 21:57:05 +1100137static const struct rhashtable_params tsk_rht_params;
138
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900139/*
Allan Stephens0c3141e2008-04-15 00:22:02 -0700140 * Revised TIPC socket locking policy:
141 *
142 * Most socket operations take the standard socket lock when they start
143 * and hold it until they finish (or until they need to sleep). Acquiring
144 * this lock grants the owner exclusive access to the fields of the socket
145 * data structures, with the exception of the backlog queue. A few socket
146 * operations can be done without taking the socket lock because they only
147 * read socket information that never changes during the life of the socket.
148 *
149 * Socket operations may acquire the lock for the associated TIPC port if they
150 * need to perform an operation on the port. If any routine needs to acquire
151 * both the socket lock and the port lock it must take the socket lock first
152 * to avoid the risk of deadlock.
153 *
154 * The dispatcher handling incoming messages cannot grab the socket lock in
155 * the standard fashion, since invoked it runs at the BH level and cannot block.
156 * Instead, it checks to see if the socket lock is currently owned by someone,
157 * and either handles the message itself or adds it to the socket's backlog
158 * queue; in the latter case the queued message is processed once the process
159 * owning the socket lock releases it.
160 *
161 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
162 * the problem of a blocked socket operation preventing any other operations
163 * from occurring. However, applications must be careful if they have
164 * multiple threads trying to send (or receive) on the same socket, as these
165 * operations might interfere with each other. For example, doing a connect
166 * and a receive at the same time might allow the receive to consume the
167 * ACK message meant for the connect. While additional work could be done
168 * to try and overcome this, it doesn't seem to be worthwhile at the present.
169 *
170 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
171 * that another operation that must be performed in a non-blocking manner is
172 * not delayed for very long because the lock has already been taken.
173 *
174 * NOTE: This code assumes that certain fields of a port/socket pair are
175 * constant over its lifetime; such fields can be examined without taking
176 * the socket lock and/or port lock, and do not need to be re-read even
177 * after resuming processing after waiting. These fields include:
178 * - socket type
179 * - pointer to socket sk structure (aka tipc_sock structure)
180 * - pointer to port structure
181 * - port reference
Per Lidenb97bf3f2006-01-02 19:04:38 +0100182 */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100183
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500184static u32 tsk_own_node(struct tipc_sock *tsk)
185{
186 return msg_prevnode(&tsk->phdr);
187}
188
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400189static u32 tsk_peer_node(struct tipc_sock *tsk)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400190{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400191 return msg_destnode(&tsk->phdr);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400192}
193
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400194static u32 tsk_peer_port(struct tipc_sock *tsk)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400195{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400196 return msg_destport(&tsk->phdr);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400197}
198
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400199static bool tsk_unreliable(struct tipc_sock *tsk)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400200{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400201 return msg_src_droppable(&tsk->phdr) != 0;
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400202}
203
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400204static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400205{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400206 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400207}
208
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400209static bool tsk_unreturnable(struct tipc_sock *tsk)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400210{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400211 return msg_dest_droppable(&tsk->phdr) != 0;
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400212}
213
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400214static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400215{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400216 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400217}
218
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400219static int tsk_importance(struct tipc_sock *tsk)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400220{
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400221 return msg_importance(&tsk->phdr);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400222}
223
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400224static int tsk_set_importance(struct tipc_sock *tsk, int imp)
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400225{
226 if (imp > TIPC_CRITICAL_IMPORTANCE)
227 return -EINVAL;
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400228 msg_set_importance(&tsk->phdr, (u32)imp);
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400229 return 0;
230}
Jon Paul Maloy8826cde2014-03-12 11:31:09 -0400231
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400232static struct tipc_sock *tipc_sk(const struct sock *sk)
233{
234 return container_of(sk, struct tipc_sock, sk);
235}
236
237static int tsk_conn_cong(struct tipc_sock *tsk)
238{
239 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
240}
241
Per Lidenb97bf3f2006-01-02 19:04:38 +0100242/**
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400243 * tsk_advance_rx_queue - discard first buffer in socket receive queue
Allan Stephens0c3141e2008-04-15 00:22:02 -0700244 *
245 * Caller must hold socket lock
Per Lidenb97bf3f2006-01-02 19:04:38 +0100246 */
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400247static void tsk_advance_rx_queue(struct sock *sk)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100248{
Allan Stephens5f6d9122011-11-04 13:24:29 -0400249 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
Per Lidenb97bf3f2006-01-02 19:04:38 +0100250}
251
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400252/* tipc_sk_respond() : send response message back to sender
253 */
254static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
255{
256 u32 selector;
257 u32 dnode;
258 u32 onode = tipc_own_addr(sock_net(sk));
259
260 if (!tipc_msg_reverse(onode, &skb, err))
261 return;
262
263 dnode = msg_destnode(buf_msg(skb));
264 selector = msg_origport(buf_msg(skb));
265 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
266}
267
Per Lidenb97bf3f2006-01-02 19:04:38 +0100268/**
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400269 * tsk_rej_rx_queue - reject all buffers in socket receive queue
Allan Stephens0c3141e2008-04-15 00:22:02 -0700270 *
271 * Caller must hold socket lock
272 */
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400273static void tsk_rej_rx_queue(struct sock *sk)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700274{
Ying Xuea6ca1092014-11-26 11:41:55 +0800275 struct sk_buff *skb;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700276
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400277 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
278 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700279}
280
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400281/* tsk_peer_msg - verify if message was sent by connected port's peer
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400282 *
283 * Handles cases where the node's network address has changed from
284 * the default of <0.0.0> to its configured setting.
285 */
Jon Paul Maloy2e84c602014-08-22 18:09:18 -0400286static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400287{
Ying Xue34747532015-01-09 15:27:10 +0800288 struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400289 u32 peer_port = tsk_peer_port(tsk);
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400290 u32 orig_node;
291 u32 peer_node;
292
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400293 if (unlikely(!tsk->connected))
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400294 return false;
295
296 if (unlikely(msg_origport(msg) != peer_port))
297 return false;
298
299 orig_node = msg_orignode(msg);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400300 peer_node = tsk_peer_node(tsk);
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400301
302 if (likely(orig_node == peer_node))
303 return true;
304
Ying Xue34747532015-01-09 15:27:10 +0800305 if (!orig_node && (peer_node == tn->own_addr))
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400306 return true;
307
Ying Xue34747532015-01-09 15:27:10 +0800308 if (!peer_node && (orig_node == tn->own_addr))
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -0400309 return true;
310
311 return false;
312}
313
Allan Stephens0c3141e2008-04-15 00:22:02 -0700314/**
Ying Xuec5fa7b32013-06-17 10:54:39 -0400315 * tipc_sk_create - create a TIPC socket
Allan Stephens0c3141e2008-04-15 00:22:02 -0700316 * @net: network namespace (must be default network)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100317 * @sock: pre-allocated socket structure
318 * @protocol: protocol indicator (must be 0)
Eric Paris3f378b62009-11-05 22:18:14 -0800319 * @kern: caused by kernel or by userspace?
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900320 *
Allan Stephens0c3141e2008-04-15 00:22:02 -0700321 * This routine creates additional data structures used by the TIPC socket,
322 * initializes them, and links them together.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323 *
324 * Returns 0 on success, errno otherwise
325 */
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400326static int tipc_sk_create(struct net *net, struct socket *sock,
327 int protocol, int kern)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100328{
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500329 struct tipc_net *tn;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700330 const struct proto_ops *ops;
331 socket_state state;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100332 struct sock *sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400333 struct tipc_sock *tsk;
Jon Paul Maloy5b8fa7c2014-08-22 18:09:13 -0400334 struct tipc_msg *msg;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700335
336 /* Validate arguments */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100337 if (unlikely(protocol != 0))
338 return -EPROTONOSUPPORT;
339
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340 switch (sock->type) {
341 case SOCK_STREAM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700342 ops = &stream_ops;
343 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100344 break;
345 case SOCK_SEQPACKET:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700346 ops = &packet_ops;
347 state = SS_UNCONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100348 break;
349 case SOCK_DGRAM:
Per Lidenb97bf3f2006-01-02 19:04:38 +0100350 case SOCK_RDM:
Allan Stephens0c3141e2008-04-15 00:22:02 -0700351 ops = &msg_ops;
352 state = SS_READY;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100353 break;
Allan Stephens49978652006-06-25 23:47:18 -0700354 default:
Allan Stephens49978652006-06-25 23:47:18 -0700355 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100356 }
357
Allan Stephens0c3141e2008-04-15 00:22:02 -0700358 /* Allocate socket's protocol area */
Eric W. Biederman11aa9c22015-05-08 21:09:13 -0500359 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700360 if (sk == NULL)
361 return -ENOMEM;
362
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400363 tsk = tipc_sk(sk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400364 tsk->max_pkt = MAX_PKT_DEFAULT;
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400365 INIT_LIST_HEAD(&tsk->publications);
366 msg = &tsk->phdr;
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500367 tn = net_generic(sock_net(sk), tipc_net_id);
368 tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
Jon Paul Maloy5b8fa7c2014-08-22 18:09:13 -0400369 NAMED_H_SIZE, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100370
Allan Stephens0c3141e2008-04-15 00:22:02 -0700371 /* Finish initializing socket data structures */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700372 sock->ops = ops;
373 sock->state = state;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100374 sock_init_data(sock, sk);
Ying Xue07f6c4b2015-01-07 13:41:58 +0800375 if (tipc_sk_insert(tsk)) {
376 pr_warn("Socket create failed; port numbrer exhausted\n");
377 return -EINVAL;
378 }
379 msg_set_origport(msg, tsk->portid);
Ying Xue3721e9c2015-01-13 17:07:48 +0800380 setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
Jon Paul Maloy4f4482d2014-05-14 05:39:09 -0400381 sk->sk_backlog_rcv = tipc_backlog_rcv;
Ying Xuecc79dd12013-06-17 10:54:37 -0400382 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
Ying Xuef288bef2012-08-21 11:16:57 +0800383 sk->sk_data_ready = tipc_data_ready;
384 sk->sk_write_space = tipc_write_space;
Ying Xuef4195d12015-11-22 15:46:05 +0800385 sk->sk_destruct = tipc_sock_destruct;
Jon Paul Maloy4f4482d2014-05-14 05:39:09 -0400386 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
Jon Paul Maloy60120522014-06-25 20:41:42 -0500387 tsk->sent_unacked = 0;
Jon Paul Maloy4f4482d2014-05-14 05:39:09 -0400388 atomic_set(&tsk->dupl_rcvcnt, 0);
Allan Stephens7ef43eb2008-05-12 15:42:28 -0700389
Allan Stephens0c3141e2008-04-15 00:22:02 -0700390 if (sock->state == SS_READY) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400391 tsk_set_unreturnable(tsk, true);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700392 if (sock->type == SOCK_DGRAM)
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400393 tsk_set_unreliable(tsk, true);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700394 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100395 return 0;
396}
397
Ying Xue07f6c4b2015-01-07 13:41:58 +0800398static void tipc_sk_callback(struct rcu_head *head)
399{
400 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
401
402 sock_put(&tsk->sk);
403}
404
Ying Xuec5fa7b32013-06-17 10:54:39 -0400405/**
Ying Xue247f0f32014-02-18 16:06:46 +0800406 * tipc_release - destroy a TIPC socket
Per Lidenb97bf3f2006-01-02 19:04:38 +0100407 * @sock: socket to destroy
408 *
409 * This routine cleans up any messages that are still queued on the socket.
410 * For DGRAM and RDM socket types, all queued messages are rejected.
411 * For SEQPACKET and STREAM socket types, the first message is rejected
412 * and any others are discarded. (If the first message on a STREAM socket
413 * is partially-read, it is discarded and the next one is rejected instead.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900414 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100415 * NOTE: Rejected messages are not necessarily returned to the sender! They
416 * are returned or discarded according to the "destination droppable" setting
417 * specified for the message by the sender.
418 *
419 * Returns 0 on success, errno otherwise
420 */
Ying Xue247f0f32014-02-18 16:06:46 +0800421static int tipc_release(struct socket *sock)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100422{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423 struct sock *sk = sock->sk;
Sasha Levin357c4772015-01-13 12:46:41 -0500424 struct net *net;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400425 struct tipc_sock *tsk;
Ying Xuea6ca1092014-11-26 11:41:55 +0800426 struct sk_buff *skb;
Ying Xue1ea23a22015-05-28 13:19:22 +0800427 u32 dnode;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100428
Allan Stephens0c3141e2008-04-15 00:22:02 -0700429 /*
430 * Exit if socket isn't fully initialized (occurs when a failed accept()
431 * releases a pre-allocated child socket that was never used)
432 */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700433 if (sk == NULL)
434 return 0;
435
Sasha Levin357c4772015-01-13 12:46:41 -0500436 net = sock_net(sk);
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400437 tsk = tipc_sk(sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700438 lock_sock(sk);
439
440 /*
441 * Reject all unreceived messages, except on an active connection
442 * (which disconnects locally & sends a 'FIN+' to peer)
443 */
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400444 dnode = tsk_peer_node(tsk);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100445 while (sock->state != SS_DISCONNECTING) {
Ying Xuea6ca1092014-11-26 11:41:55 +0800446 skb = __skb_dequeue(&sk->sk_receive_queue);
447 if (skb == NULL)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100448 break;
Ying Xuea6ca1092014-11-26 11:41:55 +0800449 if (TIPC_SKB_CB(skb)->handle != NULL)
450 kfree_skb(skb);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700451 else {
452 if ((sock->state == SS_CONNECTING) ||
453 (sock->state == SS_CONNECTED)) {
454 sock->state = SS_DISCONNECTING;
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400455 tsk->connected = 0;
Ying Xuef2f98002015-01-09 15:27:05 +0800456 tipc_node_remove_conn(net, dnode, tsk->portid);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700457 }
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400458 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700459 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100460 }
461
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400462 tipc_sk_withdraw(tsk, 0, NULL);
Ying Xue1ea23a22015-05-28 13:19:22 +0800463 sk_stop_timer(sk, &sk->sk_timer);
Ying Xue07f6c4b2015-01-07 13:41:58 +0800464 tipc_sk_remove(tsk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400465 if (tsk->connected) {
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500466 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
Ying Xue34747532015-01-09 15:27:10 +0800467 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500468 tsk_own_node(tsk), tsk_peer_port(tsk),
Ying Xue07f6c4b2015-01-07 13:41:58 +0800469 tsk->portid, TIPC_ERR_NO_PORT);
Ying Xuea6ca1092014-11-26 11:41:55 +0800470 if (skb)
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400471 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
Ying Xuef2f98002015-01-09 15:27:05 +0800472 tipc_node_remove_conn(net, dnode, tsk->portid);
Jon Paul Maloy5b8fa7c2014-08-22 18:09:13 -0400473 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100474
Allan Stephens0c3141e2008-04-15 00:22:02 -0700475 /* Reject any messages that accumulated in backlog queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -0700476 sock->state = SS_DISCONNECTING;
477 release_sock(sk);
Ying Xue07f6c4b2015-01-07 13:41:58 +0800478
479 call_rcu(&tsk->rcu, tipc_sk_callback);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700480 sock->sk = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100481
Geert Uytterhoeven065d7e32014-04-06 15:56:14 +0200482 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100483}
484
485/**
Ying Xue247f0f32014-02-18 16:06:46 +0800486 * tipc_bind - associate or disassocate TIPC name(s) with a socket
Per Lidenb97bf3f2006-01-02 19:04:38 +0100487 * @sock: socket structure
488 * @uaddr: socket address describing name(s) and desired operation
489 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900490 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100491 * Name and name sequence binding is indicated using a positive scope value;
492 * a negative scope value unbinds the specified name. Specifying no name
493 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900494 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100495 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700496 *
497 * NOTE: This routine doesn't need to take the socket lock since it doesn't
498 * access any non-constant socket information.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100499 */
Ying Xue247f0f32014-02-18 16:06:46 +0800500static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
501 int uaddr_len)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100502{
Ying Xue84602762013-12-27 10:18:28 +0800503 struct sock *sk = sock->sk;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100504 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400505 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xue84602762013-12-27 10:18:28 +0800506 int res = -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100507
Ying Xue84602762013-12-27 10:18:28 +0800508 lock_sock(sk);
509 if (unlikely(!uaddr_len)) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400510 res = tipc_sk_withdraw(tsk, 0, NULL);
Ying Xue84602762013-12-27 10:18:28 +0800511 goto exit;
512 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900513
Ying Xue84602762013-12-27 10:18:28 +0800514 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
515 res = -EINVAL;
516 goto exit;
517 }
518 if (addr->family != AF_TIPC) {
519 res = -EAFNOSUPPORT;
520 goto exit;
521 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100522
Per Lidenb97bf3f2006-01-02 19:04:38 +0100523 if (addr->addrtype == TIPC_ADDR_NAME)
524 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
Ying Xue84602762013-12-27 10:18:28 +0800525 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
526 res = -EAFNOSUPPORT;
527 goto exit;
528 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900529
Ying Xue13a2e892013-06-17 10:54:40 -0400530 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
Ying Xue7d0ab172013-06-17 10:54:41 -0400531 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
Ying Xue84602762013-12-27 10:18:28 +0800532 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
533 res = -EACCES;
534 goto exit;
535 }
Allan Stephensc422f1b2011-11-02 15:49:40 -0400536
Ying Xue84602762013-12-27 10:18:28 +0800537 res = (addr->scope > 0) ?
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400538 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
539 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
Ying Xue84602762013-12-27 10:18:28 +0800540exit:
541 release_sock(sk);
542 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100543}
544
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900545/**
Ying Xue247f0f32014-02-18 16:06:46 +0800546 * tipc_getname - get port ID of socket or peer socket
Per Lidenb97bf3f2006-01-02 19:04:38 +0100547 * @sock: socket structure
548 * @uaddr: area for returned socket address
549 * @uaddr_len: area for returned length of socket address
Allan Stephens2da59912008-07-14 22:43:32 -0700550 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900551 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100552 * Returns 0 on success, errno otherwise
Allan Stephens0c3141e2008-04-15 00:22:02 -0700553 *
Allan Stephens2da59912008-07-14 22:43:32 -0700554 * NOTE: This routine doesn't need to take the socket lock since it only
555 * accesses socket information that is unchanging (or which changes in
Allan Stephens0e659672010-12-31 18:59:32 +0000556 * a completely predictable manner).
Per Lidenb97bf3f2006-01-02 19:04:38 +0100557 */
Ying Xue247f0f32014-02-18 16:06:46 +0800558static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
559 int *uaddr_len, int peer)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100560{
Per Lidenb97bf3f2006-01-02 19:04:38 +0100561 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400562 struct tipc_sock *tsk = tipc_sk(sock->sk);
Ying Xue34747532015-01-09 15:27:10 +0800563 struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100564
Kulikov Vasiliy88f8a5e2010-10-31 07:10:32 +0000565 memset(addr, 0, sizeof(*addr));
Allan Stephens0c3141e2008-04-15 00:22:02 -0700566 if (peer) {
Allan Stephens2da59912008-07-14 22:43:32 -0700567 if ((sock->state != SS_CONNECTED) &&
568 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
569 return -ENOTCONN;
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400570 addr->addr.id.ref = tsk_peer_port(tsk);
571 addr->addr.id.node = tsk_peer_node(tsk);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700572 } else {
Ying Xue07f6c4b2015-01-07 13:41:58 +0800573 addr->addr.id.ref = tsk->portid;
Ying Xue34747532015-01-09 15:27:10 +0800574 addr->addr.id.node = tn->own_addr;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700575 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100576
577 *uaddr_len = sizeof(*addr);
578 addr->addrtype = TIPC_ADDR_ID;
579 addr->family = AF_TIPC;
580 addr->scope = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100581 addr->addr.name.domain = 0;
582
Allan Stephens0c3141e2008-04-15 00:22:02 -0700583 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100584}
585
586/**
Ying Xue247f0f32014-02-18 16:06:46 +0800587 * tipc_poll - read and possibly block on pollmask
Per Lidenb97bf3f2006-01-02 19:04:38 +0100588 * @file: file structure associated with the socket
589 * @sock: socket for which to calculate the poll bits
590 * @wait: ???
591 *
Allan Stephens9b674e82008-03-26 16:48:21 -0700592 * Returns pollmask value
593 *
594 * COMMENTARY:
595 * It appears that the usual socket locking mechanisms are not useful here
596 * since the pollmask info is potentially out-of-date the moment this routine
597 * exits. TCP and other protocols seem to rely on higher level poll routines
598 * to handle any preventable race conditions, so TIPC will do the same ...
599 *
600 * TIPC sets the returned events as follows:
Allan Stephens9b674e82008-03-26 16:48:21 -0700601 *
Allan Stephensf662c072010-08-17 11:00:06 +0000602 * socket state flags set
603 * ------------ ---------
604 * unconnected no read flags
Erik Hugnec4fc2982012-10-16 16:47:06 +0200605 * POLLOUT if port is not congested
Allan Stephensf662c072010-08-17 11:00:06 +0000606 *
607 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
608 * no write flags
609 *
610 * connected POLLIN/POLLRDNORM if data in rx queue
611 * POLLOUT if port is not congested
612 *
613 * disconnecting POLLIN/POLLRDNORM/POLLHUP
614 * no write flags
615 *
616 * listening POLLIN if SYN in rx queue
617 * no write flags
618 *
619 * ready POLLIN/POLLRDNORM if data in rx queue
620 * [connectionless] POLLOUT (since port cannot be congested)
621 *
622 * IMPORTANT: The fact that a read or write operation is indicated does NOT
623 * imply that the operation will succeed, merely that it should be performed
624 * and will not block.
Per Lidenb97bf3f2006-01-02 19:04:38 +0100625 */
Ying Xue247f0f32014-02-18 16:06:46 +0800626static unsigned int tipc_poll(struct file *file, struct socket *sock,
627 poll_table *wait)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100628{
Allan Stephens9b674e82008-03-26 16:48:21 -0700629 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400630 struct tipc_sock *tsk = tipc_sk(sk);
Allan Stephensf662c072010-08-17 11:00:06 +0000631 u32 mask = 0;
Allan Stephens9b674e82008-03-26 16:48:21 -0700632
Ying Xuef288bef2012-08-21 11:16:57 +0800633 sock_poll_wait(file, sk_sleep(sk), wait);
Allan Stephens9b674e82008-03-26 16:48:21 -0700634
Allan Stephensf662c072010-08-17 11:00:06 +0000635 switch ((int)sock->state) {
Erik Hugnec4fc2982012-10-16 16:47:06 +0200636 case SS_UNCONNECTED:
Jon Paul Maloy60120522014-06-25 20:41:42 -0500637 if (!tsk->link_cong)
Erik Hugnec4fc2982012-10-16 16:47:06 +0200638 mask |= POLLOUT;
639 break;
Allan Stephensf662c072010-08-17 11:00:06 +0000640 case SS_READY:
641 case SS_CONNECTED:
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400642 if (!tsk->link_cong && !tsk_conn_cong(tsk))
Allan Stephensf662c072010-08-17 11:00:06 +0000643 mask |= POLLOUT;
644 /* fall thru' */
645 case SS_CONNECTING:
646 case SS_LISTENING:
647 if (!skb_queue_empty(&sk->sk_receive_queue))
648 mask |= (POLLIN | POLLRDNORM);
649 break;
650 case SS_DISCONNECTING:
651 mask = (POLLIN | POLLRDNORM | POLLHUP);
652 break;
653 }
Allan Stephens9b674e82008-03-26 16:48:21 -0700654
655 return mask;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100656}
657
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400658/**
659 * tipc_sendmcast - send multicast message
660 * @sock: socket structure
661 * @seq: destination address
Al Viro562640f2014-11-15 01:13:43 -0500662 * @msg: message to send
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400663 * @dsz: total length of message data
664 * @timeo: timeout to wait for wakeup
665 *
666 * Called from function tipc_sendmsg(), which has done all sanity checks
667 * Returns the number of bytes sent on success, or errno
668 */
669static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
Al Viro562640f2014-11-15 01:13:43 -0500670 struct msghdr *msg, size_t dsz, long timeo)
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400671{
672 struct sock *sk = sock->sk;
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500673 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xuef2f98002015-01-09 15:27:05 +0800674 struct net *net = sock_net(sk);
Jon Paul Maloyc5898632015-02-05 08:36:36 -0500675 struct tipc_msg *mhdr = &tsk->phdr;
Jon Paul Maloy94153e32015-02-05 08:36:40 -0500676 struct sk_buff_head *pktchain = &sk->sk_write_queue;
Al Virof25dcc72014-11-28 15:52:29 -0500677 struct iov_iter save = msg->msg_iter;
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400678 uint mtu;
679 int rc;
680
681 msg_set_type(mhdr, TIPC_MCAST_MSG);
682 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
683 msg_set_destport(mhdr, 0);
684 msg_set_destnode(mhdr, 0);
685 msg_set_nametype(mhdr, seq->type);
686 msg_set_namelower(mhdr, seq->lower);
687 msg_set_nameupper(mhdr, seq->upper);
688 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
689
690new_mtu:
Jon Paul Maloy959e1782015-10-22 08:51:43 -0400691 mtu = tipc_bcast_get_mtu(net);
Jon Paul Maloy94153e32015-02-05 08:36:40 -0500692 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, pktchain);
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400693 if (unlikely(rc < 0))
694 return rc;
695
696 do {
Jon Paul Maloy6beb19a2015-10-22 08:51:33 -0400697 rc = tipc_bcast_xmit(net, pktchain);
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400698 if (likely(!rc))
699 return dsz;
700
701 if (rc == -ELINKCONG) {
702 tsk->link_cong = 1;
703 rc = tipc_wait_for_sndmsg(sock, &timeo);
704 if (!rc)
705 continue;
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400706 }
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400707 __skb_queue_purge(pktchain);
Al Virof25dcc72014-11-28 15:52:29 -0500708 if (rc == -EMSGSIZE) {
709 msg->msg_iter = save;
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400710 goto new_mtu;
Al Virof25dcc72014-11-28 15:52:29 -0500711 }
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400712 break;
713 } while (1);
Jon Paul Maloy0abd8ff2014-07-16 20:41:01 -0400714 return rc;
715}
716
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500717/**
718 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
719 * @arrvq: queue with arriving messages, to be cloned after destination lookup
720 * @inputq: queue with cloned messages, delivered to socket after dest lookup
721 *
722 * Multi-threaded: parallel calls with reference to same queues may occur
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400723 */
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500724void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
725 struct sk_buff_head *inputq)
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400726{
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500727 struct tipc_msg *msg;
Jon Paul Maloy3c724ac2015-02-05 08:36:43 -0500728 struct tipc_plist dports;
Jon Paul Maloy3c724ac2015-02-05 08:36:43 -0500729 u32 portid;
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400730 u32 scope = TIPC_CLUSTER_SCOPE;
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500731 struct sk_buff_head tmpq;
732 uint hsz;
733 struct sk_buff *skb, *_skb;
Jon Paul Maloy3c724ac2015-02-05 08:36:43 -0500734
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500735 __skb_queue_head_init(&tmpq);
Jon Paul Maloy3c724ac2015-02-05 08:36:43 -0500736 tipc_plist_init(&dports);
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400737
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500738 skb = tipc_skb_peek(arrvq, &inputq->lock);
739 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
740 msg = buf_msg(skb);
741 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400742
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500743 if (in_own_node(net, msg_orignode(msg)))
744 scope = TIPC_NODE_SCOPE;
745
746 /* Create destination port list and message clones: */
747 tipc_nametbl_mc_translate(net,
748 msg_nametype(msg), msg_namelower(msg),
749 msg_nameupper(msg), scope, &dports);
750 portid = tipc_plist_pop(&dports);
751 for (; portid; portid = tipc_plist_pop(&dports)) {
752 _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
753 if (_skb) {
754 msg_set_destport(buf_msg(_skb), portid);
755 __skb_queue_tail(&tmpq, _skb);
756 continue;
757 }
758 pr_warn("Failed to clone mcast rcv buffer\n");
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400759 }
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500760 /* Append to inputq if not already done by other thread */
761 spin_lock_bh(&inputq->lock);
762 if (skb_peek(arrvq) == skb) {
763 skb_queue_splice_tail_init(&tmpq, inputq);
764 kfree_skb(__skb_dequeue(arrvq));
765 }
766 spin_unlock_bh(&inputq->lock);
767 __skb_queue_purge(&tmpq);
768 kfree_skb(skb);
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400769 }
Jon Paul Maloycb1b7282015-02-05 08:36:44 -0500770 tipc_sk_rcv(net, inputq);
Jon Paul Maloy078bec82014-07-16 20:41:00 -0400771}
772
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900773/**
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500774 * tipc_sk_proto_rcv - receive a connection mng protocol message
775 * @tsk: receiving socket
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400776 * @skb: pointer to message buffer.
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500777 */
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400778static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb)
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500779{
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400780 struct sock *sk = &tsk->sk;
781 struct tipc_msg *hdr = buf_msg(skb);
782 int mtyp = msg_type(hdr);
Jon Paul Maloy60120522014-06-25 20:41:42 -0500783 int conn_cong;
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400784
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500785 /* Ignore if connection cannot be validated: */
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400786 if (!tsk_peer_msg(tsk, hdr))
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500787 goto exit;
788
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400789 tsk->probing_state = TIPC_CONN_OK;
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500790
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400791 if (mtyp == CONN_PROBE) {
792 msg_set_type(hdr, CONN_PROBE_REPLY);
793 tipc_sk_respond(sk, skb, TIPC_OK);
794 return;
795 } else if (mtyp == CONN_ACK) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400796 conn_cong = tsk_conn_cong(tsk);
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400797 tsk->sent_unacked -= msg_msgcnt(hdr);
Jon Paul Maloy60120522014-06-25 20:41:42 -0500798 if (conn_cong)
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400799 sk->sk_write_space(sk);
800 } else if (mtyp != CONN_PROBE_REPLY) {
801 pr_warn("Received unknown CONN_PROTO msg\n");
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500802 }
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500803exit:
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -0400804 kfree_skb(skb);
Jon Paul Maloyac0074e2014-06-25 20:41:41 -0500805}
806
Ying Xue3f405042014-01-17 09:50:05 +0800807static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
808{
809 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400810 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xue3f405042014-01-17 09:50:05 +0800811 DEFINE_WAIT(wait);
812 int done;
813
814 do {
815 int err = sock_error(sk);
816 if (err)
817 return err;
818 if (sock->state == SS_DISCONNECTING)
819 return -EPIPE;
820 if (!*timeo_p)
821 return -EAGAIN;
822 if (signal_pending(current))
823 return sock_intr_errno(*timeo_p);
824
825 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Jon Paul Maloy60120522014-06-25 20:41:42 -0500826 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
Ying Xue3f405042014-01-17 09:50:05 +0800827 finish_wait(sk_sleep(sk), &wait);
828 } while (!done);
829 return 0;
830}
831
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500832/**
Ying Xue247f0f32014-02-18 16:06:46 +0800833 * tipc_sendmsg - send message in connectionless manner
Per Lidenb97bf3f2006-01-02 19:04:38 +0100834 * @sock: socket structure
835 * @m: message to send
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500836 * @dsz: amount of user data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900837 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100838 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900839 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100840 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
841 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900842 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100843 * Returns the number of bytes sent on success, or errno otherwise
844 */
Ying Xue1b784142015-03-02 15:37:48 +0800845static int tipc_sendmsg(struct socket *sock,
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500846 struct msghdr *m, size_t dsz)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100847{
Ying Xue39a02952015-03-02 15:37:47 +0800848 struct sock *sk = sock->sk;
849 int ret;
850
851 lock_sock(sk);
852 ret = __tipc_sendmsg(sock, m, dsz);
853 release_sock(sk);
854
855 return ret;
856}
857
858static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
859{
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500860 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
Allan Stephens0c3141e2008-04-15 00:22:02 -0700861 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400862 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xuef2f98002015-01-09 15:27:05 +0800863 struct net *net = sock_net(sk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400864 struct tipc_msg *mhdr = &tsk->phdr;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500865 u32 dnode, dport;
Jon Paul Maloy94153e32015-02-05 08:36:40 -0500866 struct sk_buff_head *pktchain = &sk->sk_write_queue;
Ying Xuea6ca1092014-11-26 11:41:55 +0800867 struct sk_buff *skb;
Erik Hugnef2f80362015-03-19 09:02:19 +0100868 struct tipc_name_seq *seq;
Al Virof25dcc72014-11-28 15:52:29 -0500869 struct iov_iter save;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500870 u32 mtu;
Ying Xue3f405042014-01-17 09:50:05 +0800871 long timeo;
Erik Hugne88b17b62014-12-03 14:44:44 +0100872 int rc;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100873
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500874 if (dsz > TIPC_MAX_USER_MSG_SIZE)
Allan Stephensc29c3f72010-04-20 17:58:24 -0400875 return -EMSGSIZE;
Erik Hugnef2f80362015-03-19 09:02:19 +0100876 if (unlikely(!dest)) {
877 if (tsk->connected && sock->state == SS_READY)
878 dest = &tsk->remote;
879 else
880 return -EDESTADDRREQ;
881 } else if (unlikely(m->msg_namelen < sizeof(*dest)) ||
882 dest->family != AF_TIPC) {
883 return -EINVAL;
884 }
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500885 if (unlikely(sock->state != SS_READY)) {
Ying Xue39a02952015-03-02 15:37:47 +0800886 if (sock->state == SS_LISTENING)
887 return -EPIPE;
888 if (sock->state != SS_UNCONNECTED)
889 return -EISCONN;
890 if (tsk->published)
891 return -EOPNOTSUPP;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700892 if (dest->addrtype == TIPC_ADDR_NAME) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400893 tsk->conn_type = dest->addr.name.name.type;
894 tsk->conn_instance = dest->addr.name.name.instance;
Allan Stephens0c3141e2008-04-15 00:22:02 -0700895 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100896 }
Erik Hugnef2f80362015-03-19 09:02:19 +0100897 seq = &dest->addr.nameseq;
Ying Xue3f405042014-01-17 09:50:05 +0800898 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500899
900 if (dest->addrtype == TIPC_ADDR_MCAST) {
Ying Xue39a02952015-03-02 15:37:47 +0800901 return tipc_sendmcast(sock, seq, m, dsz, timeo);
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500902 } else if (dest->addrtype == TIPC_ADDR_NAME) {
903 u32 type = dest->addr.name.name.type;
904 u32 inst = dest->addr.name.name.instance;
905 u32 domain = dest->addr.name.domain;
906
907 dnode = domain;
908 msg_set_type(mhdr, TIPC_NAMED_MSG);
909 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
910 msg_set_nametype(mhdr, type);
911 msg_set_nameinst(mhdr, inst);
912 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
Ying Xue4ac1c8d2015-01-09 15:27:09 +0800913 dport = tipc_nametbl_translate(net, type, inst, &dnode);
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500914 msg_set_destnode(mhdr, dnode);
915 msg_set_destport(mhdr, dport);
Ying Xue39a02952015-03-02 15:37:47 +0800916 if (unlikely(!dport && !dnode))
917 return -EHOSTUNREACH;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500918 } else if (dest->addrtype == TIPC_ADDR_ID) {
919 dnode = dest->addr.id.node;
920 msg_set_type(mhdr, TIPC_DIRECT_MSG);
921 msg_set_lookup_scope(mhdr, 0);
922 msg_set_destnode(mhdr, dnode);
923 msg_set_destport(mhdr, dest->addr.id.ref);
924 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
925 }
926
Al Virof25dcc72014-11-28 15:52:29 -0500927 save = m->msg_iter;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500928new_mtu:
Ying Xuef2f98002015-01-09 15:27:05 +0800929 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
Jon Paul Maloy94153e32015-02-05 08:36:40 -0500930 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, pktchain);
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500931 if (rc < 0)
Ying Xue39a02952015-03-02 15:37:47 +0800932 return rc;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500933
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900934 do {
Jon Paul Maloy94153e32015-02-05 08:36:40 -0500935 skb = skb_peek(pktchain);
Ying Xuea6ca1092014-11-26 11:41:55 +0800936 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -0400937 rc = tipc_node_xmit(net, pktchain, dnode, tsk->portid);
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400938 if (likely(!rc)) {
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500939 if (sock->state != SS_READY)
Allan Stephens0c3141e2008-04-15 00:22:02 -0700940 sock->state = SS_CONNECTING;
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400941 return dsz;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900942 }
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400943 if (rc == -ELINKCONG) {
944 tsk->link_cong = 1;
945 rc = tipc_wait_for_sndmsg(sock, &timeo);
946 if (!rc)
947 continue;
948 }
949 __skb_queue_purge(pktchain);
Al Virof25dcc72014-11-28 15:52:29 -0500950 if (rc == -EMSGSIZE) {
951 m->msg_iter = save;
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500952 goto new_mtu;
Al Virof25dcc72014-11-28 15:52:29 -0500953 }
Jon Paul Maloy22d85c72015-07-16 16:54:23 -0400954 break;
955 } while (1);
Jon Paul Maloye2dafe82014-06-25 20:41:37 -0500956
957 return rc;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100958}
959
Ying Xue391a6dd2014-01-17 09:50:06 +0800960static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
961{
962 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -0400963 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xue391a6dd2014-01-17 09:50:06 +0800964 DEFINE_WAIT(wait);
965 int done;
966
967 do {
968 int err = sock_error(sk);
969 if (err)
970 return err;
971 if (sock->state == SS_DISCONNECTING)
972 return -EPIPE;
973 else if (sock->state != SS_CONNECTED)
974 return -ENOTCONN;
975 if (!*timeo_p)
976 return -EAGAIN;
977 if (signal_pending(current))
978 return sock_intr_errno(*timeo_p);
979
980 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
981 done = sk_wait_event(sk, timeo_p,
Jon Paul Maloy60120522014-06-25 20:41:42 -0500982 (!tsk->link_cong &&
Jon Paul Maloy301bae52014-08-22 18:09:20 -0400983 !tsk_conn_cong(tsk)) ||
984 !tsk->connected);
Ying Xue391a6dd2014-01-17 09:50:06 +0800985 finish_wait(sk_sleep(sk), &wait);
986 } while (!done);
987 return 0;
988}
989
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900990/**
Ying Xue247f0f32014-02-18 16:06:46 +0800991 * tipc_send_stream - send stream-oriented data
Per Lidenb97bf3f2006-01-02 19:04:38 +0100992 * @sock: socket structure
993 * @m: data to send
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -0500994 * @dsz: total length of data to be transmitted
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900995 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100996 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900997 *
998 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700999 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +01001000 */
Ying Xue1b784142015-03-02 15:37:48 +08001001static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001002{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001003 struct sock *sk = sock->sk;
Ying Xue39a02952015-03-02 15:37:47 +08001004 int ret;
1005
1006 lock_sock(sk);
1007 ret = __tipc_send_stream(sock, m, dsz);
1008 release_sock(sk);
1009
1010 return ret;
1011}
1012
1013static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1014{
1015 struct sock *sk = sock->sk;
Ying Xuef2f98002015-01-09 15:27:05 +08001016 struct net *net = sock_net(sk);
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001017 struct tipc_sock *tsk = tipc_sk(sk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001018 struct tipc_msg *mhdr = &tsk->phdr;
Jon Paul Maloy94153e32015-02-05 08:36:40 -05001019 struct sk_buff_head *pktchain = &sk->sk_write_queue;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001020 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
Ying Xue07f6c4b2015-01-07 13:41:58 +08001021 u32 portid = tsk->portid;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001022 int rc = -EINVAL;
1023 long timeo;
1024 u32 dnode;
1025 uint mtu, send, sent = 0;
Al Virof25dcc72014-11-28 15:52:29 -05001026 struct iov_iter save;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001027
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001028 /* Handle implied connection establishment */
1029 if (unlikely(dest)) {
Ying Xue39a02952015-03-02 15:37:47 +08001030 rc = __tipc_sendmsg(sock, m, dsz);
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001031 if (dsz && (dsz == rc))
Jon Paul Maloy60120522014-06-25 20:41:42 -05001032 tsk->sent_unacked = 1;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001033 return rc;
1034 }
1035 if (dsz > (uint)INT_MAX)
1036 return -EMSGSIZE;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001037
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001038 if (unlikely(sock->state != SS_CONNECTED)) {
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001039 if (sock->state == SS_DISCONNECTING)
Ying Xue39a02952015-03-02 15:37:47 +08001040 return -EPIPE;
wangweidongb0555972013-12-27 10:09:39 +08001041 else
Ying Xue39a02952015-03-02 15:37:47 +08001042 return -ENOTCONN;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001043 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001044
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001045 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001046 dnode = tsk_peer_node(tsk);
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001047
1048next:
Al Virof25dcc72014-11-28 15:52:29 -05001049 save = m->msg_iter;
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001050 mtu = tsk->max_pkt;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001051 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
Jon Paul Maloy94153e32015-02-05 08:36:40 -05001052 rc = tipc_msg_build(mhdr, m, sent, send, mtu, pktchain);
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001053 if (unlikely(rc < 0))
Ying Xue39a02952015-03-02 15:37:47 +08001054 return rc;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001055 do {
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001056 if (likely(!tsk_conn_cong(tsk))) {
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001057 rc = tipc_node_xmit(net, pktchain, dnode, portid);
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001058 if (likely(!rc)) {
Jon Paul Maloy60120522014-06-25 20:41:42 -05001059 tsk->sent_unacked++;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001060 sent += send;
1061 if (sent == dsz)
Jon Paul Maloy22d85c72015-07-16 16:54:23 -04001062 return dsz;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001063 goto next;
Allan Stephens1303e8f2006-06-25 23:46:50 -07001064 }
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001065 if (rc == -EMSGSIZE) {
Jon Paul Maloy22d85c72015-07-16 16:54:23 -04001066 __skb_queue_purge(pktchain);
Ying Xuef2f98002015-01-09 15:27:05 +08001067 tsk->max_pkt = tipc_node_get_mtu(net, dnode,
1068 portid);
Al Virof25dcc72014-11-28 15:52:29 -05001069 m->msg_iter = save;
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001070 goto next;
1071 }
1072 if (rc != -ELINKCONG)
1073 break;
Jon Paul Maloy22d85c72015-07-16 16:54:23 -04001074
Jon Paul Maloy50100a52014-08-22 18:09:07 -04001075 tsk->link_cong = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001076 }
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001077 rc = tipc_wait_for_sndpkt(sock, &timeo);
1078 } while (!rc);
Ying Xue39a02952015-03-02 15:37:47 +08001079
Jon Paul Maloy22d85c72015-07-16 16:54:23 -04001080 __skb_queue_purge(pktchain);
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001081 return sent ? sent : rc;
1082}
1083
1084/**
1085 * tipc_send_packet - send a connection-oriented message
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001086 * @sock: socket structure
1087 * @m: message to send
1088 * @dsz: length of data to be transmitted
1089 *
1090 * Used for SOCK_SEQPACKET messages.
1091 *
1092 * Returns the number of bytes sent on success, or errno otherwise
1093 */
Ying Xue1b784142015-03-02 15:37:48 +08001094static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
Jon Paul Maloy4ccfe5e2014-06-25 20:41:38 -05001095{
1096 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1097 return -EMSGSIZE;
1098
Ying Xue1b784142015-03-02 15:37:48 +08001099 return tipc_send_stream(sock, m, dsz);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001100}
1101
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001102/* tipc_sk_finish_conn - complete the setup of a connection
Per Lidenb97bf3f2006-01-02 19:04:38 +01001103 */
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001104static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001105 u32 peer_node)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001106{
Ying Xue3721e9c2015-01-13 17:07:48 +08001107 struct sock *sk = &tsk->sk;
1108 struct net *net = sock_net(sk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001109 struct tipc_msg *msg = &tsk->phdr;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001110
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001111 msg_set_destnode(msg, peer_node);
1112 msg_set_destport(msg, peer_port);
1113 msg_set_type(msg, TIPC_CONN_MSG);
1114 msg_set_lookup_scope(msg, 0);
1115 msg_set_hdr_sz(msg, SHORT_H_SIZE);
Jon Paul Maloyf9fef182014-03-12 11:31:08 -04001116
Ying Xue2f55c432015-01-09 15:27:00 +08001117 tsk->probing_intv = CONN_PROBING_INTERVAL;
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001118 tsk->probing_state = TIPC_CONN_OK;
1119 tsk->connected = 1;
Ying Xue3721e9c2015-01-13 17:07:48 +08001120 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
Ying Xuef2f98002015-01-09 15:27:05 +08001121 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1122 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001123}
1124
1125/**
1126 * set_orig_addr - capture sender's address for received message
1127 * @m: descriptor for message info
1128 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001129 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001130 * Note: Address is not captured if not requested by receiver.
1131 */
Sam Ravnborg05790c62006-03-20 22:37:04 -08001132static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001133{
Steffen Hurrle342dfc32014-01-17 22:53:15 +01001134 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001135
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001136 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001137 addr->family = AF_TIPC;
1138 addr->addrtype = TIPC_ADDR_ID;
Mathias Krause60085c32013-04-07 01:52:00 +00001139 memset(&addr->addr, 0, sizeof(addr->addr));
Per Lidenb97bf3f2006-01-02 19:04:38 +01001140 addr->addr.id.ref = msg_origport(msg);
1141 addr->addr.id.node = msg_orignode(msg);
Allan Stephens0e659672010-12-31 18:59:32 +00001142 addr->addr.name.domain = 0; /* could leave uninitialized */
1143 addr->scope = 0; /* could leave uninitialized */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001144 m->msg_namelen = sizeof(struct sockaddr_tipc);
1145 }
1146}
1147
1148/**
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001149 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +01001150 * @m: descriptor for message info
1151 * @msg: received message header
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001152 * @tsk: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001153 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001154 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001155 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001156 * Returns 0 if successful, otherwise errno
1157 */
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001158static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1159 struct tipc_sock *tsk)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001160{
1161 u32 anc_data[3];
1162 u32 err;
1163 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -07001164 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001165 int res;
1166
1167 if (likely(m->msg_controllen == 0))
1168 return 0;
1169
1170 /* Optionally capture errored message object(s) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001171 err = msg ? msg_errcode(msg) : 0;
1172 if (unlikely(err)) {
1173 anc_data[0] = err;
1174 anc_data[1] = msg_data_sz(msg);
Allan Stephens2db99832010-12-31 18:59:33 +00001175 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1176 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001177 return res;
Allan Stephens2db99832010-12-31 18:59:33 +00001178 if (anc_data[1]) {
1179 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1180 msg_data(msg));
1181 if (res)
1182 return res;
1183 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001184 }
1185
1186 /* Optionally capture message destination object */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001187 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1188 switch (dest_type) {
1189 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -07001190 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001191 anc_data[0] = msg_nametype(msg);
1192 anc_data[1] = msg_namelower(msg);
1193 anc_data[2] = msg_namelower(msg);
1194 break;
1195 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -07001196 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001197 anc_data[0] = msg_nametype(msg);
1198 anc_data[1] = msg_namelower(msg);
1199 anc_data[2] = msg_nameupper(msg);
1200 break;
1201 case TIPC_CONN_MSG:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001202 has_name = (tsk->conn_type != 0);
1203 anc_data[0] = tsk->conn_type;
1204 anc_data[1] = tsk->conn_instance;
1205 anc_data[2] = tsk->conn_instance;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001206 break;
1207 default:
Allan Stephens3546c752006-06-25 23:45:24 -07001208 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001209 }
Allan Stephens2db99832010-12-31 18:59:33 +00001210 if (has_name) {
1211 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1212 if (res)
1213 return res;
1214 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001215
1216 return 0;
1217}
1218
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001219static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001220{
Ying Xuef2f98002015-01-09 15:27:05 +08001221 struct net *net = sock_net(&tsk->sk);
Ying Xuea6ca1092014-11-26 11:41:55 +08001222 struct sk_buff *skb = NULL;
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001223 struct tipc_msg *msg;
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001224 u32 peer_port = tsk_peer_port(tsk);
1225 u32 dnode = tsk_peer_node(tsk);
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001226
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001227 if (!tsk->connected)
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001228 return;
Jon Paul Maloyc5898632015-02-05 08:36:36 -05001229 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1230 dnode, tsk_own_node(tsk), peer_port,
1231 tsk->portid, TIPC_OK);
Ying Xuea6ca1092014-11-26 11:41:55 +08001232 if (!skb)
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001233 return;
Ying Xuea6ca1092014-11-26 11:41:55 +08001234 msg = buf_msg(skb);
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001235 msg_set_msgcnt(msg, ack);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001236 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
Jon Paul Maloy739f5e42014-08-22 18:09:12 -04001237}
1238
Arnaldo Carvalho de Melo85d3fc92014-05-23 15:55:12 -04001239static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001240{
1241 struct sock *sk = sock->sk;
1242 DEFINE_WAIT(wait);
Arnaldo Carvalho de Melo85d3fc92014-05-23 15:55:12 -04001243 long timeo = *timeop;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001244 int err;
1245
1246 for (;;) {
1247 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
Ying Xuefe8e4642014-03-06 14:40:18 +01001248 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001249 if (sock->state == SS_DISCONNECTING) {
1250 err = -ENOTCONN;
1251 break;
1252 }
1253 release_sock(sk);
1254 timeo = schedule_timeout(timeo);
1255 lock_sock(sk);
1256 }
1257 err = 0;
1258 if (!skb_queue_empty(&sk->sk_receive_queue))
1259 break;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001260 err = -EAGAIN;
1261 if (!timeo)
1262 break;
Erik Hugne143fe222015-03-09 10:43:42 +01001263 err = sock_intr_errno(timeo);
1264 if (signal_pending(current))
1265 break;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001266 }
1267 finish_wait(sk_sleep(sk), &wait);
Arnaldo Carvalho de Melo85d3fc92014-05-23 15:55:12 -04001268 *timeop = timeo;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001269 return err;
1270}
1271
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001272/**
Ying Xue247f0f32014-02-18 16:06:46 +08001273 * tipc_recvmsg - receive packet-oriented message
Per Lidenb97bf3f2006-01-02 19:04:38 +01001274 * @m: descriptor for message info
1275 * @buf_len: total size of user buffer area
1276 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001277 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001278 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1279 * If the complete message doesn't fit in user area, truncate it.
1280 *
1281 * Returns size of returned message data, errno otherwise
1282 */
Ying Xue1b784142015-03-02 15:37:48 +08001283static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
1284 int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001285{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001286 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001287 struct tipc_sock *tsk = tipc_sk(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001288 struct sk_buff *buf;
1289 struct tipc_msg *msg;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001290 long timeo;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001291 unsigned int sz;
1292 u32 err;
1293 int res;
1294
Allan Stephens0c3141e2008-04-15 00:22:02 -07001295 /* Catch invalid receive requests */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001296 if (unlikely(!buf_len))
1297 return -EINVAL;
1298
Allan Stephens0c3141e2008-04-15 00:22:02 -07001299 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001300
Allan Stephens0c3141e2008-04-15 00:22:02 -07001301 if (unlikely(sock->state == SS_UNCONNECTED)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001302 res = -ENOTCONN;
1303 goto exit;
1304 }
1305
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001306 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001307restart:
Per Lidenb97bf3f2006-01-02 19:04:38 +01001308
Allan Stephens0c3141e2008-04-15 00:22:02 -07001309 /* Look for a message in receive queue; wait if necessary */
Arnaldo Carvalho de Melo85d3fc92014-05-23 15:55:12 -04001310 res = tipc_wait_for_rcvmsg(sock, &timeo);
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001311 if (res)
1312 goto exit;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001313
1314 /* Look at first message in receive queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001315 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001316 msg = buf_msg(buf);
1317 sz = msg_data_sz(msg);
1318 err = msg_errcode(msg);
1319
Per Lidenb97bf3f2006-01-02 19:04:38 +01001320 /* Discard an empty non-errored message & try again */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001321 if ((!sz) && (!err)) {
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04001322 tsk_advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001323 goto restart;
1324 }
1325
1326 /* Capture sender's address (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001327 set_orig_addr(m, msg);
1328
1329 /* Capture ancillary data (optional) */
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001330 res = tipc_sk_anc_data_recv(m, msg, tsk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001331 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001332 goto exit;
1333
1334 /* Capture message data (if valid) & compute return value (always) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001335 if (!err) {
1336 if (unlikely(buf_len < sz)) {
1337 sz = buf_len;
1338 m->msg_flags |= MSG_TRUNC;
1339 }
David S. Miller51f3d022014-11-05 16:46:40 -05001340 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
Allan Stephens0232fd02011-02-21 09:45:40 -05001341 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342 goto exit;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001343 res = sz;
1344 } else {
1345 if ((sock->state == SS_READY) ||
1346 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1347 res = 0;
1348 else
1349 res = -ECONNRESET;
1350 }
1351
1352 /* Consume received message (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001353 if (likely(!(flags & MSG_PEEK))) {
Allan Stephens99009802008-04-15 00:06:12 -07001354 if ((sock->state != SS_READY) &&
Jon Paul Maloy60120522014-06-25 20:41:42 -05001355 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001356 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
Jon Paul Maloy60120522014-06-25 20:41:42 -05001357 tsk->rcv_unacked = 0;
1358 }
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04001359 tsk_advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001360 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001361exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001362 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001363 return res;
1364}
1365
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001366/**
Ying Xue247f0f32014-02-18 16:06:46 +08001367 * tipc_recv_stream - receive stream-oriented data
Per Lidenb97bf3f2006-01-02 19:04:38 +01001368 * @m: descriptor for message info
1369 * @buf_len: total size of user buffer area
1370 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001371 *
1372 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +01001373 * will optionally wait for more; never truncates data.
1374 *
1375 * Returns size of returned message data, errno otherwise
1376 */
Ying Xue1b784142015-03-02 15:37:48 +08001377static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
1378 size_t buf_len, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001379{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001380 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001381 struct tipc_sock *tsk = tipc_sk(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001382 struct sk_buff *buf;
1383 struct tipc_msg *msg;
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001384 long timeo;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001385 unsigned int sz;
Florian Westphal3720d402010-08-17 11:00:04 +00001386 int sz_to_copy, target, needed;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001387 int sz_copied = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001388 u32 err;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001389 int res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001390
1391 /* Catch invalid receive attempts */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001392 if (unlikely(!buf_len))
1393 return -EINVAL;
1394
Allan Stephens0c3141e2008-04-15 00:22:02 -07001395 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001396
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001397 if (unlikely(sock->state == SS_UNCONNECTED)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001398 res = -ENOTCONN;
1399 goto exit;
1400 }
1401
Florian Westphal3720d402010-08-17 11:00:04 +00001402 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001403 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
Paul Gortmaker617d3c72012-04-30 15:29:02 -04001404
Allan Stephens0c3141e2008-04-15 00:22:02 -07001405restart:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001406 /* Look for a message in receive queue; wait if necessary */
Arnaldo Carvalho de Melo85d3fc92014-05-23 15:55:12 -04001407 res = tipc_wait_for_rcvmsg(sock, &timeo);
Ying Xue9bbb4ec2014-01-17 09:50:07 +08001408 if (res)
1409 goto exit;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001410
1411 /* Look at first message in receive queue */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001412 buf = skb_peek(&sk->sk_receive_queue);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001413 msg = buf_msg(buf);
1414 sz = msg_data_sz(msg);
1415 err = msg_errcode(msg);
1416
1417 /* Discard an empty non-errored message & try again */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001418 if ((!sz) && (!err)) {
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04001419 tsk_advance_rx_queue(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001420 goto restart;
1421 }
1422
1423 /* Optionally capture sender's address & ancillary data of first msg */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001424 if (sz_copied == 0) {
1425 set_orig_addr(m, msg);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001426 res = tipc_sk_anc_data_recv(m, msg, tsk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001427 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001428 goto exit;
1429 }
1430
1431 /* Capture message data (if valid) & compute return value (always) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001432 if (!err) {
Allan Stephens0232fd02011-02-21 09:45:40 -05001433 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001434
Allan Stephens0232fd02011-02-21 09:45:40 -05001435 sz -= offset;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001436 needed = (buf_len - sz_copied);
1437 sz_to_copy = (sz <= needed) ? sz : needed;
Allan Stephens0232fd02011-02-21 09:45:40 -05001438
David S. Miller51f3d022014-11-05 16:46:40 -05001439 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1440 m, sz_to_copy);
Allan Stephens0232fd02011-02-21 09:45:40 -05001441 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001442 goto exit;
Allan Stephens0232fd02011-02-21 09:45:40 -05001443
Per Lidenb97bf3f2006-01-02 19:04:38 +01001444 sz_copied += sz_to_copy;
1445
1446 if (sz_to_copy < sz) {
1447 if (!(flags & MSG_PEEK))
Allan Stephens0232fd02011-02-21 09:45:40 -05001448 TIPC_SKB_CB(buf)->handle =
1449 (void *)(unsigned long)(offset + sz_to_copy);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001450 goto exit;
1451 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001452 } else {
1453 if (sz_copied != 0)
1454 goto exit; /* can't add error msg to valid data */
1455
1456 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1457 res = 0;
1458 else
1459 res = -ECONNRESET;
1460 }
1461
1462 /* Consume received message (optional) */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001463 if (likely(!(flags & MSG_PEEK))) {
Jon Paul Maloy60120522014-06-25 20:41:42 -05001464 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001465 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
Jon Paul Maloy60120522014-06-25 20:41:42 -05001466 tsk->rcv_unacked = 0;
1467 }
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04001468 tsk_advance_rx_queue(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001469 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001470
1471 /* Loop around if more data is required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001472 if ((sz_copied < buf_len) && /* didn't get all requested data */
1473 (!skb_queue_empty(&sk->sk_receive_queue) ||
Florian Westphal3720d402010-08-17 11:00:04 +00001474 (sz_copied < target)) && /* and more is ready or required */
Joe Perchesf64f9e72009-11-29 16:55:45 -08001475 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1476 (!err)) /* and haven't reached a FIN */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001477 goto restart;
1478
1479exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07001480 release_sock(sk);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001481 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001482}
1483
1484/**
Ying Xuef288bef2012-08-21 11:16:57 +08001485 * tipc_write_space - wake up thread if port congestion is released
1486 * @sk: socket
1487 */
1488static void tipc_write_space(struct sock *sk)
1489{
1490 struct socket_wq *wq;
1491
1492 rcu_read_lock();
1493 wq = rcu_dereference(sk->sk_wq);
Herbert Xu1ce0bf52015-11-26 13:55:39 +08001494 if (skwq_has_sleeper(wq))
Ying Xuef288bef2012-08-21 11:16:57 +08001495 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1496 POLLWRNORM | POLLWRBAND);
1497 rcu_read_unlock();
1498}
1499
1500/**
1501 * tipc_data_ready - wake up threads to indicate messages have been received
1502 * @sk: socket
1503 * @len: the length of messages
1504 */
David S. Miller676d2362014-04-11 16:15:36 -04001505static void tipc_data_ready(struct sock *sk)
Ying Xuef288bef2012-08-21 11:16:57 +08001506{
1507 struct socket_wq *wq;
1508
1509 rcu_read_lock();
1510 wq = rcu_dereference(sk->sk_wq);
Herbert Xu1ce0bf52015-11-26 13:55:39 +08001511 if (skwq_has_sleeper(wq))
Ying Xuef288bef2012-08-21 11:16:57 +08001512 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1513 POLLRDNORM | POLLRDBAND);
1514 rcu_read_unlock();
1515}
1516
Ying Xuef4195d12015-11-22 15:46:05 +08001517static void tipc_sock_destruct(struct sock *sk)
1518{
1519 __skb_queue_purge(&sk->sk_receive_queue);
1520}
1521
Ying Xuef288bef2012-08-21 11:16:57 +08001522/**
Ying Xue7e6c1312012-11-29 18:39:14 -05001523 * filter_connect - Handle all incoming messages for a connection-based socket
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001524 * @tsk: TIPC socket
Jon Paul Maloy1186adf2015-02-05 08:36:37 -05001525 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
Ying Xue7e6c1312012-11-29 18:39:14 -05001526 *
Jon Paul Maloycda36962015-07-22 10:11:20 -04001527 * Returns true if everything ok, false otherwise
Ying Xue7e6c1312012-11-29 18:39:14 -05001528 */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001529static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
Ying Xue7e6c1312012-11-29 18:39:14 -05001530{
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001531 struct sock *sk = &tsk->sk;
Ying Xuef2f98002015-01-09 15:27:05 +08001532 struct net *net = sock_net(sk);
Jon Paul Maloy8826cde2014-03-12 11:31:09 -04001533 struct socket *sock = sk->sk_socket;
Jon Paul Maloycda36962015-07-22 10:11:20 -04001534 struct tipc_msg *hdr = buf_msg(skb);
Ying Xue7e6c1312012-11-29 18:39:14 -05001535
Jon Paul Maloycda36962015-07-22 10:11:20 -04001536 if (unlikely(msg_mcast(hdr)))
1537 return false;
Ying Xue7e6c1312012-11-29 18:39:14 -05001538
1539 switch ((int)sock->state) {
1540 case SS_CONNECTED:
Jon Paul Maloycda36962015-07-22 10:11:20 -04001541
Ying Xue7e6c1312012-11-29 18:39:14 -05001542 /* Accept only connection-based messages sent by peer */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001543 if (unlikely(!tsk_peer_msg(tsk, hdr)))
1544 return false;
1545
1546 if (unlikely(msg_errcode(hdr))) {
1547 sock->state = SS_DISCONNECTING;
1548 tsk->connected = 0;
1549 /* Let timer expire on it's own */
1550 tipc_node_remove_conn(net, tsk_peer_node(tsk),
1551 tsk->portid);
Ying Xue7e6c1312012-11-29 18:39:14 -05001552 }
Jon Paul Maloycda36962015-07-22 10:11:20 -04001553 return true;
1554
Ying Xue7e6c1312012-11-29 18:39:14 -05001555 case SS_CONNECTING:
Jon Paul Maloycda36962015-07-22 10:11:20 -04001556
Ying Xue7e6c1312012-11-29 18:39:14 -05001557 /* Accept only ACK or NACK message */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001558 if (unlikely(!msg_connected(hdr)))
1559 return false;
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001560
Jon Paul Maloycda36962015-07-22 10:11:20 -04001561 if (unlikely(msg_errcode(hdr))) {
Ying Xue584d24b2012-11-29 18:51:19 -05001562 sock->state = SS_DISCONNECTING;
Erik Hugne2c8d8512013-08-28 09:29:58 +02001563 sk->sk_err = ECONNREFUSED;
Jon Paul Maloycda36962015-07-22 10:11:20 -04001564 return true;
Ying Xue584d24b2012-11-29 18:51:19 -05001565 }
1566
Jon Paul Maloycda36962015-07-22 10:11:20 -04001567 if (unlikely(!msg_isdata(hdr))) {
Ying Xue584d24b2012-11-29 18:51:19 -05001568 sock->state = SS_DISCONNECTING;
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001569 sk->sk_err = EINVAL;
Jon Paul Maloycda36962015-07-22 10:11:20 -04001570 return true;
Ying Xue584d24b2012-11-29 18:51:19 -05001571 }
1572
Jon Paul Maloycda36962015-07-22 10:11:20 -04001573 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
1574 msg_set_importance(&tsk->phdr, msg_importance(hdr));
Jon Paul Maloydadebc02014-08-22 18:09:11 -04001575 sock->state = SS_CONNECTED;
1576
Jon Paul Maloycda36962015-07-22 10:11:20 -04001577 /* If 'ACK+' message, add to socket receive queue */
1578 if (msg_data_sz(hdr))
1579 return true;
1580
1581 /* If empty 'ACK-' message, wake up sleeping connect() */
1582 if (waitqueue_active(sk_sleep(sk)))
1583 wake_up_interruptible(sk_sleep(sk));
1584
1585 /* 'ACK-' message is neither accepted nor rejected: */
1586 msg_set_dest_droppable(hdr, 1);
1587 return false;
1588
Ying Xue7e6c1312012-11-29 18:39:14 -05001589 case SS_LISTENING:
1590 case SS_UNCONNECTED:
Jon Paul Maloycda36962015-07-22 10:11:20 -04001591
Ying Xue7e6c1312012-11-29 18:39:14 -05001592 /* Accept only SYN message */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001593 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
1594 return true;
Ying Xue7e6c1312012-11-29 18:39:14 -05001595 break;
1596 case SS_DISCONNECTING:
1597 break;
1598 default:
1599 pr_err("Unknown socket state %u\n", sock->state);
1600 }
Jon Paul Maloycda36962015-07-22 10:11:20 -04001601 return false;
Ying Xue7e6c1312012-11-29 18:39:14 -05001602}
1603
1604/**
Ying Xueaba79f32013-01-20 23:30:09 +01001605 * rcvbuf_limit - get proper overload limit of socket receive queue
1606 * @sk: socket
1607 * @buf: message
1608 *
1609 * For all connection oriented messages, irrespective of importance,
1610 * the default overload value (i.e. 67MB) is set as limit.
1611 *
1612 * For all connectionless messages, by default new queue limits are
1613 * as belows:
1614 *
Ying Xuecc79dd12013-06-17 10:54:37 -04001615 * TIPC_LOW_IMPORTANCE (4 MB)
1616 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1617 * TIPC_HIGH_IMPORTANCE (16 MB)
1618 * TIPC_CRITICAL_IMPORTANCE (32 MB)
Ying Xueaba79f32013-01-20 23:30:09 +01001619 *
1620 * Returns overload limit according to corresponding message importance
1621 */
1622static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1623{
1624 struct tipc_msg *msg = buf_msg(buf);
Ying Xueaba79f32013-01-20 23:30:09 +01001625
1626 if (msg_connected(msg))
wangweidong0cee6bb2013-12-12 09:36:39 +08001627 return sysctl_tipc_rmem[2];
1628
1629 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1630 msg_importance(msg);
Ying Xueaba79f32013-01-20 23:30:09 +01001631}
1632
1633/**
Allan Stephens0c3141e2008-04-15 00:22:02 -07001634 * filter_rcv - validate incoming message
1635 * @sk: socket
Jon Paul Maloycda36962015-07-22 10:11:20 -04001636 * @skb: pointer to message.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001637 *
Allan Stephens0c3141e2008-04-15 00:22:02 -07001638 * Enqueues message on receive queue if acceptable; optionally handles
1639 * disconnect indication for a connected socket.
1640 *
Jon Paul Maloy1186adf2015-02-05 08:36:37 -05001641 * Called with socket lock already taken
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001642 *
Jon Paul Maloycda36962015-07-22 10:11:20 -04001643 * Returns true if message was added to socket receive queue, otherwise false
Per Lidenb97bf3f2006-01-02 19:04:38 +01001644 */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001645static bool filter_rcv(struct sock *sk, struct sk_buff *skb)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001646{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001647 struct socket *sock = sk->sk_socket;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04001648 struct tipc_sock *tsk = tipc_sk(sk);
Jon Paul Maloycda36962015-07-22 10:11:20 -04001649 struct tipc_msg *hdr = buf_msg(skb);
1650 unsigned int limit = rcvbuf_limit(sk, skb);
1651 int err = TIPC_OK;
1652 int usr = msg_user(hdr);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001653
Jon Paul Maloycda36962015-07-22 10:11:20 -04001654 if (unlikely(msg_user(hdr) == CONN_MANAGER)) {
1655 tipc_sk_proto_rcv(tsk, skb);
1656 return false;
Jon Paul Maloy1186adf2015-02-05 08:36:37 -05001657 }
Jon Paul Maloyec8a2e52014-06-25 20:41:40 -05001658
Jon Paul Maloycda36962015-07-22 10:11:20 -04001659 if (unlikely(usr == SOCK_WAKEUP)) {
1660 kfree_skb(skb);
Jon Paul Maloy50100a52014-08-22 18:09:07 -04001661 tsk->link_cong = 0;
1662 sk->sk_write_space(sk);
Jon Paul Maloycda36962015-07-22 10:11:20 -04001663 return false;
Jon Paul Maloy50100a52014-08-22 18:09:07 -04001664 }
1665
Jon Paul Maloycda36962015-07-22 10:11:20 -04001666 /* Drop if illegal message type */
1667 if (unlikely(msg_type(hdr) > TIPC_DIRECT_MSG)) {
1668 kfree_skb(skb);
1669 return false;
1670 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001671
Jon Paul Maloycda36962015-07-22 10:11:20 -04001672 /* Reject if wrong message type for current socket state */
1673 if (unlikely(sock->state == SS_READY)) {
1674 if (msg_connected(hdr)) {
1675 err = TIPC_ERR_NO_PORT;
1676 goto reject;
1677 }
1678 } else if (unlikely(!filter_connect(tsk, skb))) {
1679 err = TIPC_ERR_NO_PORT;
1680 goto reject;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001681 }
1682
1683 /* Reject message if there isn't room to queue it */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001684 if (unlikely(sk_rmem_alloc_get(sk) + skb->truesize >= limit)) {
1685 err = TIPC_ERR_OVERLOAD;
1686 goto reject;
1687 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001688
Ying Xueaba79f32013-01-20 23:30:09 +01001689 /* Enqueue message */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001690 TIPC_SKB_CB(skb)->handle = NULL;
1691 __skb_queue_tail(&sk->sk_receive_queue, skb);
1692 skb_set_owner_r(skb, sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001693
David S. Miller676d2362014-04-11 16:15:36 -04001694 sk->sk_data_ready(sk);
Jon Paul Maloycda36962015-07-22 10:11:20 -04001695 return true;
1696
1697reject:
1698 tipc_sk_respond(sk, skb, err);
1699 return false;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001700}
1701
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001702/**
Jon Paul Maloy4f4482d2014-05-14 05:39:09 -04001703 * tipc_backlog_rcv - handle incoming message from backlog queue
Allan Stephens0c3141e2008-04-15 00:22:02 -07001704 * @sk: socket
Ying Xuea6ca1092014-11-26 11:41:55 +08001705 * @skb: message
Allan Stephens0c3141e2008-04-15 00:22:02 -07001706 *
Jon Paul Maloye3a77562015-02-05 08:36:39 -05001707 * Caller must hold socket lock
Allan Stephens0c3141e2008-04-15 00:22:02 -07001708 *
1709 * Returns 0
1710 */
Ying Xuea6ca1092014-11-26 11:41:55 +08001711static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001712{
Jon Paul Maloycda36962015-07-22 10:11:20 -04001713 unsigned int truesize = skb->truesize;
Allan Stephens0c3141e2008-04-15 00:22:02 -07001714
Jon Paul Maloycda36962015-07-22 10:11:20 -04001715 if (likely(filter_rcv(sk, skb)))
1716 atomic_add(truesize, &tipc_sk(sk)->dupl_rcvcnt);
Allan Stephens0c3141e2008-04-15 00:22:02 -07001717 return 0;
1718}
1719
1720/**
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001721 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1722 * inputq and try adding them to socket or backlog queue
1723 * @inputq: list of incoming buffers with potentially different destinations
1724 * @sk: socket where the buffers should be enqueued
1725 * @dport: port number for the socket
Jon Paul Maloyd570d862015-02-05 08:36:38 -05001726 *
1727 * Caller must hold socket lock
Jon Paul Maloyd570d862015-02-05 08:36:38 -05001728 */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001729static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
1730 u32 dport)
Jon Paul Maloyd570d862015-02-05 08:36:38 -05001731{
1732 unsigned int lim;
1733 atomic_t *dcnt;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001734 struct sk_buff *skb;
1735 unsigned long time_limit = jiffies + 2;
Jon Paul Maloyd570d862015-02-05 08:36:38 -05001736
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001737 while (skb_queue_len(inputq)) {
Jon Paul Maloy51a00da2015-02-08 11:10:50 -05001738 if (unlikely(time_after_eq(jiffies, time_limit)))
Jon Paul Maloycda36962015-07-22 10:11:20 -04001739 return;
1740
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001741 skb = tipc_skb_dequeue(inputq, dport);
1742 if (unlikely(!skb))
Jon Paul Maloycda36962015-07-22 10:11:20 -04001743 return;
1744
1745 /* Add message directly to receive queue if possible */
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001746 if (!sock_owned_by_user(sk)) {
Jon Paul Maloycda36962015-07-22 10:11:20 -04001747 filter_rcv(sk, skb);
1748 continue;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001749 }
Jon Paul Maloycda36962015-07-22 10:11:20 -04001750
1751 /* Try backlog, compensating for double-counted bytes */
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001752 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
1753 if (sk->sk_backlog.len)
1754 atomic_set(dcnt, 0);
1755 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
1756 if (likely(!sk_add_backlog(sk, skb, lim)))
1757 continue;
Jon Paul Maloycda36962015-07-22 10:11:20 -04001758
1759 /* Overload => reject message back to sender */
1760 tipc_sk_respond(sk, skb, TIPC_ERR_OVERLOAD);
1761 break;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001762 }
Jon Paul Maloyd570d862015-02-05 08:36:38 -05001763}
1764
1765/**
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001766 * tipc_sk_rcv - handle a chain of incoming buffers
1767 * @inputq: buffer list containing the buffers
1768 * Consumes all buffers in list until inputq is empty
1769 * Note: may be called in multiple threads referring to the same queue
Allan Stephens0c3141e2008-04-15 00:22:02 -07001770 */
Jon Paul Maloycda36962015-07-22 10:11:20 -04001771void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001772{
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001773 u32 dnode, dport = 0;
Erik Hugne9871b272015-04-23 09:37:39 -04001774 int err;
Jon Paul Maloy9816f062014-05-14 05:39:15 -04001775 struct tipc_sock *tsk;
Jon Paul Maloy9816f062014-05-14 05:39:15 -04001776 struct sock *sk;
Jon Paul Maloycda36962015-07-22 10:11:20 -04001777 struct sk_buff *skb;
Jon Paul Maloy9816f062014-05-14 05:39:15 -04001778
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001779 while (skb_queue_len(inputq)) {
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001780 dport = tipc_skb_peek_port(inputq, dport);
1781 tsk = tipc_sk_lookup(net, dport);
Jon Paul Maloycda36962015-07-22 10:11:20 -04001782
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001783 if (likely(tsk)) {
1784 sk = &tsk->sk;
1785 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
Jon Paul Maloycda36962015-07-22 10:11:20 -04001786 tipc_sk_enqueue(inputq, sk, dport);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001787 spin_unlock_bh(&sk->sk_lock.slock);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001788 }
1789 sock_put(sk);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001790 continue;
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001791 }
Jon Paul Maloycda36962015-07-22 10:11:20 -04001792
1793 /* No destination socket => dequeue skb if still there */
1794 skb = tipc_skb_dequeue(inputq, dport);
1795 if (!skb)
1796 return;
1797
1798 /* Try secondary lookup if unresolved named message */
1799 err = TIPC_ERR_NO_PORT;
1800 if (tipc_msg_lookup_dest(net, skb, &err))
1801 goto xmit;
1802
1803 /* Prepare for message rejection */
1804 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001805 continue;
Jon Paul Maloye3a77562015-02-05 08:36:39 -05001806xmit:
Jon Paul Maloycda36962015-07-22 10:11:20 -04001807 dnode = msg_destnode(buf_msg(skb));
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04001808 tipc_node_xmit_skb(net, skb, dnode, dport);
Jon Paul Maloyc637c102015-02-05 08:36:41 -05001809 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001810}
1811
Ying Xue78eb3a52014-01-17 09:50:03 +08001812static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1813{
1814 struct sock *sk = sock->sk;
1815 DEFINE_WAIT(wait);
1816 int done;
1817
1818 do {
1819 int err = sock_error(sk);
1820 if (err)
1821 return err;
1822 if (!*timeo_p)
1823 return -ETIMEDOUT;
1824 if (signal_pending(current))
1825 return sock_intr_errno(*timeo_p);
1826
1827 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1828 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1829 finish_wait(sk_sleep(sk), &wait);
1830 } while (!done);
1831 return 0;
1832}
1833
Per Lidenb97bf3f2006-01-02 19:04:38 +01001834/**
Ying Xue247f0f32014-02-18 16:06:46 +08001835 * tipc_connect - establish a connection to another TIPC port
Per Lidenb97bf3f2006-01-02 19:04:38 +01001836 * @sock: socket structure
1837 * @dest: socket address for destination port
1838 * @destlen: size of socket address data structure
Allan Stephens0c3141e2008-04-15 00:22:02 -07001839 * @flags: file-related flags associated with socket
Per Lidenb97bf3f2006-01-02 19:04:38 +01001840 *
1841 * Returns 0 on success, errno otherwise
1842 */
Ying Xue247f0f32014-02-18 16:06:46 +08001843static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1844 int destlen, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001845{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001846 struct sock *sk = sock->sk;
Erik Hugnef2f80362015-03-19 09:02:19 +01001847 struct tipc_sock *tsk = tipc_sk(sk);
Allan Stephensb89741a2008-04-15 00:20:37 -07001848 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1849 struct msghdr m = {NULL,};
Erik Hugnef2f80362015-03-19 09:02:19 +01001850 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
Ying Xue78eb3a52014-01-17 09:50:03 +08001851 socket_state previous;
Erik Hugnef2f80362015-03-19 09:02:19 +01001852 int res = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001853
Allan Stephens0c3141e2008-04-15 00:22:02 -07001854 lock_sock(sk);
1855
Erik Hugnef2f80362015-03-19 09:02:19 +01001856 /* DGRAM/RDM connect(), just save the destaddr */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001857 if (sock->state == SS_READY) {
Erik Hugnef2f80362015-03-19 09:02:19 +01001858 if (dst->family == AF_UNSPEC) {
1859 memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc));
1860 tsk->connected = 0;
Sasha Levin610600c2015-03-23 15:30:00 -04001861 } else if (destlen != sizeof(struct sockaddr_tipc)) {
1862 res = -EINVAL;
Erik Hugnef2f80362015-03-19 09:02:19 +01001863 } else {
1864 memcpy(&tsk->remote, dest, destlen);
1865 tsk->connected = 1;
1866 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001867 goto exit;
1868 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001869
Allan Stephensb89741a2008-04-15 00:20:37 -07001870 /*
1871 * Reject connection attempt using multicast address
1872 *
1873 * Note: send_msg() validates the rest of the address fields,
1874 * so there's no need to do it here
1875 */
Allan Stephens0c3141e2008-04-15 00:22:02 -07001876 if (dst->addrtype == TIPC_ADDR_MCAST) {
1877 res = -EINVAL;
1878 goto exit;
1879 }
1880
Ying Xue78eb3a52014-01-17 09:50:03 +08001881 previous = sock->state;
Ying Xue584d24b2012-11-29 18:51:19 -05001882 switch (sock->state) {
1883 case SS_UNCONNECTED:
1884 /* Send a 'SYN-' to destination */
1885 m.msg_name = dest;
1886 m.msg_namelen = destlen;
1887
1888 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1889 * indicate send_msg() is never blocked.
1890 */
1891 if (!timeout)
1892 m.msg_flags = MSG_DONTWAIT;
1893
Ying Xue39a02952015-03-02 15:37:47 +08001894 res = __tipc_sendmsg(sock, &m, 0);
Ying Xue584d24b2012-11-29 18:51:19 -05001895 if ((res < 0) && (res != -EWOULDBLOCK))
1896 goto exit;
1897
1898 /* Just entered SS_CONNECTING state; the only
1899 * difference is that return value in non-blocking
1900 * case is EINPROGRESS, rather than EALREADY.
1901 */
1902 res = -EINPROGRESS;
Ying Xue584d24b2012-11-29 18:51:19 -05001903 case SS_CONNECTING:
Ying Xue78eb3a52014-01-17 09:50:03 +08001904 if (previous == SS_CONNECTING)
1905 res = -EALREADY;
1906 if (!timeout)
1907 goto exit;
1908 timeout = msecs_to_jiffies(timeout);
1909 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1910 res = tipc_wait_for_connect(sock, &timeout);
Ying Xue584d24b2012-11-29 18:51:19 -05001911 break;
1912 case SS_CONNECTED:
1913 res = -EISCONN;
1914 break;
1915 default:
1916 res = -EINVAL;
Ying Xue78eb3a52014-01-17 09:50:03 +08001917 break;
Allan Stephensb89741a2008-04-15 00:20:37 -07001918 }
Allan Stephens0c3141e2008-04-15 00:22:02 -07001919exit:
1920 release_sock(sk);
Allan Stephensb89741a2008-04-15 00:20:37 -07001921 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001922}
1923
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001924/**
Ying Xue247f0f32014-02-18 16:06:46 +08001925 * tipc_listen - allow socket to listen for incoming connections
Per Lidenb97bf3f2006-01-02 19:04:38 +01001926 * @sock: socket structure
1927 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001928 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001929 * Returns 0 on success, errno otherwise
1930 */
Ying Xue247f0f32014-02-18 16:06:46 +08001931static int tipc_listen(struct socket *sock, int len)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001932{
Allan Stephens0c3141e2008-04-15 00:22:02 -07001933 struct sock *sk = sock->sk;
1934 int res;
1935
1936 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001937
Ying Xue245f3d32011-07-06 06:01:13 -04001938 if (sock->state != SS_UNCONNECTED)
Allan Stephens0c3141e2008-04-15 00:22:02 -07001939 res = -EINVAL;
1940 else {
1941 sock->state = SS_LISTENING;
1942 res = 0;
1943 }
1944
1945 release_sock(sk);
1946 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001947}
1948
Ying Xue6398e232014-01-17 09:50:04 +08001949static int tipc_wait_for_accept(struct socket *sock, long timeo)
1950{
1951 struct sock *sk = sock->sk;
1952 DEFINE_WAIT(wait);
1953 int err;
1954
1955 /* True wake-one mechanism for incoming connections: only
1956 * one process gets woken up, not the 'whole herd'.
1957 * Since we do not 'race & poll' for established sockets
1958 * anymore, the common case will execute the loop only once.
1959 */
1960 for (;;) {
1961 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1962 TASK_INTERRUPTIBLE);
Ying Xuefe8e4642014-03-06 14:40:18 +01001963 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
Ying Xue6398e232014-01-17 09:50:04 +08001964 release_sock(sk);
1965 timeo = schedule_timeout(timeo);
1966 lock_sock(sk);
1967 }
1968 err = 0;
1969 if (!skb_queue_empty(&sk->sk_receive_queue))
1970 break;
1971 err = -EINVAL;
1972 if (sock->state != SS_LISTENING)
1973 break;
Ying Xue6398e232014-01-17 09:50:04 +08001974 err = -EAGAIN;
1975 if (!timeo)
1976 break;
Erik Hugne143fe222015-03-09 10:43:42 +01001977 err = sock_intr_errno(timeo);
1978 if (signal_pending(current))
1979 break;
Ying Xue6398e232014-01-17 09:50:04 +08001980 }
1981 finish_wait(sk_sleep(sk), &wait);
1982 return err;
1983}
1984
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001985/**
Ying Xue247f0f32014-02-18 16:06:46 +08001986 * tipc_accept - wait for connection request
Per Lidenb97bf3f2006-01-02 19:04:38 +01001987 * @sock: listening socket
1988 * @newsock: new socket that is to be connected
1989 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001990 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001991 * Returns 0 on success, errno otherwise
1992 */
Ying Xue247f0f32014-02-18 16:06:46 +08001993static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001994{
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05001995 struct sock *new_sk, *sk = sock->sk;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001996 struct sk_buff *buf;
Jon Paul Maloy301bae52014-08-22 18:09:20 -04001997 struct tipc_sock *new_tsock;
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05001998 struct tipc_msg *msg;
Ying Xue6398e232014-01-17 09:50:04 +08001999 long timeo;
Allan Stephens0c3141e2008-04-15 00:22:02 -07002000 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002001
Allan Stephens0c3141e2008-04-15 00:22:02 -07002002 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002003
Allan Stephens0c3141e2008-04-15 00:22:02 -07002004 if (sock->state != SS_LISTENING) {
2005 res = -EINVAL;
2006 goto exit;
2007 }
Ying Xue6398e232014-01-17 09:50:04 +08002008 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2009 res = tipc_wait_for_accept(sock, timeo);
2010 if (res)
2011 goto exit;
Allan Stephens0c3141e2008-04-15 00:22:02 -07002012
2013 buf = skb_peek(&sk->sk_receive_queue);
2014
Ying Xuec5fa7b32013-06-17 10:54:39 -04002015 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002016 if (res)
2017 goto exit;
Stephen Smalleyfdd75ea2015-07-07 09:43:45 -04002018 security_sk_clone(sock->sk, new_sock->sk);
Allan Stephens0c3141e2008-04-15 00:22:02 -07002019
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002020 new_sk = new_sock->sk;
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002021 new_tsock = tipc_sk(new_sk);
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002022 msg = buf_msg(buf);
Allan Stephens0c3141e2008-04-15 00:22:02 -07002023
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002024 /* we lock on new_sk; but lockdep sees the lock on sk */
2025 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
Allan Stephens0c3141e2008-04-15 00:22:02 -07002026
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002027 /*
2028 * Reject any stray messages received by new socket
2029 * before the socket lock was taken (very, very unlikely)
2030 */
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04002031 tsk_rej_rx_queue(new_sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002032
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002033 /* Connect new socket to it's peer */
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002034 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002035 new_sock->state = SS_CONNECTED;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002036
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002037 tsk_set_importance(new_tsock, msg_importance(msg));
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002038 if (msg_named(msg)) {
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002039 new_tsock->conn_type = msg_nametype(msg);
2040 new_tsock->conn_instance = msg_nameinst(msg);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002041 }
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002042
2043 /*
2044 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2045 * Respond to 'SYN+' by queuing it on new socket.
2046 */
2047 if (!msg_data_sz(msg)) {
2048 struct msghdr m = {NULL,};
2049
Jon Paul Maloy2e84c602014-08-22 18:09:18 -04002050 tsk_advance_rx_queue(sk);
Ying Xue39a02952015-03-02 15:37:47 +08002051 __tipc_send_stream(new_sock, &m, 0);
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002052 } else {
2053 __skb_dequeue(&sk->sk_receive_queue);
2054 __skb_queue_head(&new_sk->sk_receive_queue, buf);
Ying Xueaba79f32013-01-20 23:30:09 +01002055 skb_set_owner_r(buf, new_sk);
Paul Gortmaker0fef8f22012-12-04 11:01:55 -05002056 }
2057 release_sock(new_sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002058exit:
Allan Stephens0c3141e2008-04-15 00:22:02 -07002059 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002060 return res;
2061}
2062
2063/**
Ying Xue247f0f32014-02-18 16:06:46 +08002064 * tipc_shutdown - shutdown socket connection
Per Lidenb97bf3f2006-01-02 19:04:38 +01002065 * @sock: socket structure
Allan Stephense247a8f2008-03-06 15:05:38 -08002066 * @how: direction to close (must be SHUT_RDWR)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002067 *
2068 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002069 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002070 * Returns 0 on success, errno otherwise
2071 */
Ying Xue247f0f32014-02-18 16:06:46 +08002072static int tipc_shutdown(struct socket *sock, int how)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002073{
Allan Stephens0c3141e2008-04-15 00:22:02 -07002074 struct sock *sk = sock->sk;
Ying Xuef2f98002015-01-09 15:27:05 +08002075 struct net *net = sock_net(sk);
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04002076 struct tipc_sock *tsk = tipc_sk(sk);
Ying Xuea6ca1092014-11-26 11:41:55 +08002077 struct sk_buff *skb;
Jon Paul Maloycda36962015-07-22 10:11:20 -04002078 u32 dnode = tsk_peer_node(tsk);
2079 u32 dport = tsk_peer_port(tsk);
2080 u32 onode = tipc_own_addr(net);
2081 u32 oport = tsk->portid;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002082 int res;
2083
Allan Stephense247a8f2008-03-06 15:05:38 -08002084 if (how != SHUT_RDWR)
2085 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002086
Allan Stephens0c3141e2008-04-15 00:22:02 -07002087 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002088
2089 switch (sock->state) {
Allan Stephens0c3141e2008-04-15 00:22:02 -07002090 case SS_CONNECTING:
Per Lidenb97bf3f2006-01-02 19:04:38 +01002091 case SS_CONNECTED:
2092
Per Lidenb97bf3f2006-01-02 19:04:38 +01002093restart:
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -04002094 dnode = tsk_peer_node(tsk);
2095
Paul Gortmaker617d3c72012-04-30 15:29:02 -04002096 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
Ying Xuea6ca1092014-11-26 11:41:55 +08002097 skb = __skb_dequeue(&sk->sk_receive_queue);
2098 if (skb) {
2099 if (TIPC_SKB_CB(skb)->handle != NULL) {
2100 kfree_skb(skb);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002101 goto restart;
2102 }
Jon Paul Maloybcd3ffd2015-07-22 10:11:19 -04002103 tipc_sk_respond(sk, skb, TIPC_CONN_SHUTDOWN);
Allan Stephens0c3141e2008-04-15 00:22:02 -07002104 } else {
Jon Paul Maloyc5898632015-02-05 08:36:36 -05002105 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
Jon Paul Maloy80e44c22014-08-22 18:09:10 -04002106 TIPC_CONN_MSG, SHORT_H_SIZE,
Jon Paul Maloycda36962015-07-22 10:11:20 -04002107 0, dnode, onode, dport, oport,
2108 TIPC_CONN_SHUTDOWN);
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04002109 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002110 }
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002111 tsk->connected = 0;
Allan Stephens0c3141e2008-04-15 00:22:02 -07002112 sock->state = SS_DISCONNECTING;
Ying Xuef2f98002015-01-09 15:27:05 +08002113 tipc_node_remove_conn(net, dnode, tsk->portid);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002114 /* fall through */
2115
2116 case SS_DISCONNECTING:
2117
Ying Xue75031152012-10-29 09:38:15 -04002118 /* Discard any unreceived messages */
Ying Xue57467e52013-01-20 23:30:08 +01002119 __skb_queue_purge(&sk->sk_receive_queue);
Ying Xue75031152012-10-29 09:38:15 -04002120
2121 /* Wake up anyone sleeping in poll */
2122 sk->sk_state_change(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002123 res = 0;
2124 break;
2125
2126 default:
2127 res = -ENOTCONN;
2128 }
2129
Allan Stephens0c3141e2008-04-15 00:22:02 -07002130 release_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002131 return res;
2132}
2133
Ying Xuef2f2a962015-01-09 15:27:02 +08002134static void tipc_sk_timeout(unsigned long data)
Jon Paul Maloy57289012014-08-22 18:09:09 -04002135{
Ying Xuef2f2a962015-01-09 15:27:02 +08002136 struct tipc_sock *tsk = (struct tipc_sock *)data;
2137 struct sock *sk = &tsk->sk;
Ying Xuea6ca1092014-11-26 11:41:55 +08002138 struct sk_buff *skb = NULL;
Jon Paul Maloy57289012014-08-22 18:09:09 -04002139 u32 peer_port, peer_node;
Jon Paul Maloyc5898632015-02-05 08:36:36 -05002140 u32 own_node = tsk_own_node(tsk);
Jon Paul Maloy57289012014-08-22 18:09:09 -04002141
Jon Paul Maloy57289012014-08-22 18:09:09 -04002142 bh_lock_sock(sk);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002143 if (!tsk->connected) {
Jon Paul Maloy6c9808c2014-08-22 18:09:16 -04002144 bh_unlock_sock(sk);
2145 goto exit;
2146 }
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002147 peer_port = tsk_peer_port(tsk);
2148 peer_node = tsk_peer_node(tsk);
Jon Paul Maloy57289012014-08-22 18:09:09 -04002149
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002150 if (tsk->probing_state == TIPC_CONN_PROBING) {
Erik Hugneb3be5e32015-06-09 17:27:12 +02002151 if (!sock_owned_by_user(sk)) {
2152 sk->sk_socket->state = SS_DISCONNECTING;
2153 tsk->connected = 0;
2154 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
2155 tsk_peer_port(tsk));
2156 sk->sk_state_change(sk);
2157 } else {
2158 /* Try again later */
2159 sk_reset_timer(sk, &sk->sk_timer, (HZ / 20));
2160 }
2161
Jon Paul Maloy57289012014-08-22 18:09:09 -04002162 } else {
Jon Paul Maloyc5898632015-02-05 08:36:36 -05002163 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE,
2164 INT_H_SIZE, 0, peer_node, own_node,
Ying Xuef2f2a962015-01-09 15:27:02 +08002165 peer_port, tsk->portid, TIPC_OK);
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002166 tsk->probing_state = TIPC_CONN_PROBING;
Ying Xue3721e9c2015-01-13 17:07:48 +08002167 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
Jon Paul Maloy57289012014-08-22 18:09:09 -04002168 }
2169 bh_unlock_sock(sk);
Ying Xuea6ca1092014-11-26 11:41:55 +08002170 if (skb)
Jon Paul Maloyaf9b0282015-07-16 16:54:24 -04002171 tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
Jon Paul Maloy6c9808c2014-08-22 18:09:16 -04002172exit:
Ying Xue07f6c4b2015-01-07 13:41:58 +08002173 sock_put(sk);
Jon Paul Maloy57289012014-08-22 18:09:09 -04002174}
2175
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002176static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002177 struct tipc_name_seq const *seq)
2178{
Ying Xuef2f98002015-01-09 15:27:05 +08002179 struct net *net = sock_net(&tsk->sk);
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002180 struct publication *publ;
2181 u32 key;
2182
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002183 if (tsk->connected)
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002184 return -EINVAL;
Ying Xue07f6c4b2015-01-07 13:41:58 +08002185 key = tsk->portid + tsk->pub_count + 1;
2186 if (key == tsk->portid)
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002187 return -EADDRINUSE;
2188
Ying Xuef2f98002015-01-09 15:27:05 +08002189 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
Ying Xue07f6c4b2015-01-07 13:41:58 +08002190 scope, tsk->portid, key);
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002191 if (unlikely(!publ))
2192 return -EINVAL;
2193
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002194 list_add(&publ->pport_list, &tsk->publications);
2195 tsk->pub_count++;
2196 tsk->published = 1;
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002197 return 0;
2198}
2199
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002200static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002201 struct tipc_name_seq const *seq)
2202{
Ying Xuef2f98002015-01-09 15:27:05 +08002203 struct net *net = sock_net(&tsk->sk);
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002204 struct publication *publ;
2205 struct publication *safe;
2206 int rc = -EINVAL;
2207
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002208 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002209 if (seq) {
2210 if (publ->scope != scope)
2211 continue;
2212 if (publ->type != seq->type)
2213 continue;
2214 if (publ->lower != seq->lower)
2215 continue;
2216 if (publ->upper != seq->upper)
2217 break;
Ying Xuef2f98002015-01-09 15:27:05 +08002218 tipc_nametbl_withdraw(net, publ->type, publ->lower,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002219 publ->ref, publ->key);
2220 rc = 0;
2221 break;
2222 }
Ying Xuef2f98002015-01-09 15:27:05 +08002223 tipc_nametbl_withdraw(net, publ->type, publ->lower,
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002224 publ->ref, publ->key);
2225 rc = 0;
2226 }
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002227 if (list_empty(&tsk->publications))
2228 tsk->published = 0;
Jon Paul Maloy0fc87aa2014-08-22 18:09:17 -04002229 return rc;
2230}
2231
Jon Paul Maloy5a9ee0be2014-08-22 18:09:14 -04002232/* tipc_sk_reinit: set non-zero address in all existing sockets
2233 * when we go from standalone to network mode.
2234 */
Ying Xuee05b31f2015-01-09 15:27:08 +08002235void tipc_sk_reinit(struct net *net)
Jon Paul Maloy5a9ee0be2014-08-22 18:09:14 -04002236{
Ying Xuee05b31f2015-01-09 15:27:08 +08002237 struct tipc_net *tn = net_generic(net, tipc_net_id);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002238 const struct bucket_table *tbl;
2239 struct rhash_head *pos;
2240 struct tipc_sock *tsk;
Jon Paul Maloy5a9ee0be2014-08-22 18:09:14 -04002241 struct tipc_msg *msg;
Ying Xue07f6c4b2015-01-07 13:41:58 +08002242 int i;
Jon Paul Maloy5a9ee0be2014-08-22 18:09:14 -04002243
Ying Xue07f6c4b2015-01-07 13:41:58 +08002244 rcu_read_lock();
Ying Xuee05b31f2015-01-09 15:27:08 +08002245 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002246 for (i = 0; i < tbl->size; i++) {
2247 rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
2248 spin_lock_bh(&tsk->sk.sk_lock.slock);
2249 msg = &tsk->phdr;
Ying Xue34747532015-01-09 15:27:10 +08002250 msg_set_prevnode(msg, tn->own_addr);
2251 msg_set_orignode(msg, tn->own_addr);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002252 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2253 }
2254 }
2255 rcu_read_unlock();
2256}
2257
Ying Xuee05b31f2015-01-09 15:27:08 +08002258static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
Ying Xue07f6c4b2015-01-07 13:41:58 +08002259{
Ying Xuee05b31f2015-01-09 15:27:08 +08002260 struct tipc_net *tn = net_generic(net, tipc_net_id);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002261 struct tipc_sock *tsk;
2262
2263 rcu_read_lock();
Herbert Xu6cca72892015-03-20 21:57:05 +11002264 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002265 if (tsk)
2266 sock_hold(&tsk->sk);
2267 rcu_read_unlock();
2268
2269 return tsk;
2270}
2271
2272static int tipc_sk_insert(struct tipc_sock *tsk)
2273{
Ying Xuee05b31f2015-01-09 15:27:08 +08002274 struct sock *sk = &tsk->sk;
2275 struct net *net = sock_net(sk);
2276 struct tipc_net *tn = net_generic(net, tipc_net_id);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002277 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2278 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2279
2280 while (remaining--) {
2281 portid++;
2282 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2283 portid = TIPC_MIN_PORT;
2284 tsk->portid = portid;
2285 sock_hold(&tsk->sk);
Herbert Xu6cca72892015-03-20 21:57:05 +11002286 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2287 tsk_rht_params))
Ying Xue07f6c4b2015-01-07 13:41:58 +08002288 return 0;
2289 sock_put(&tsk->sk);
2290 }
2291
2292 return -1;
2293}
2294
2295static void tipc_sk_remove(struct tipc_sock *tsk)
2296{
2297 struct sock *sk = &tsk->sk;
Ying Xuee05b31f2015-01-09 15:27:08 +08002298 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002299
Herbert Xu6cca72892015-03-20 21:57:05 +11002300 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
Ying Xue07f6c4b2015-01-07 13:41:58 +08002301 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
2302 __sock_put(sk);
Jon Paul Maloy5a9ee0be2014-08-22 18:09:14 -04002303 }
2304}
2305
Herbert Xu6cca72892015-03-20 21:57:05 +11002306static const struct rhashtable_params tsk_rht_params = {
2307 .nelem_hint = 192,
2308 .head_offset = offsetof(struct tipc_sock, node),
2309 .key_offset = offsetof(struct tipc_sock, portid),
2310 .key_len = sizeof(u32), /* portid */
Herbert Xu6cca72892015-03-20 21:57:05 +11002311 .max_size = 1048576,
2312 .min_size = 256,
Thomas Grafb5e2c152015-03-24 20:42:19 +00002313 .automatic_shrinking = true,
Herbert Xu6cca72892015-03-20 21:57:05 +11002314};
2315
Ying Xuee05b31f2015-01-09 15:27:08 +08002316int tipc_sk_rht_init(struct net *net)
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002317{
Ying Xuee05b31f2015-01-09 15:27:08 +08002318 struct tipc_net *tn = net_generic(net, tipc_net_id);
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002319
Herbert Xu6cca72892015-03-20 21:57:05 +11002320 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002321}
2322
Ying Xuee05b31f2015-01-09 15:27:08 +08002323void tipc_sk_rht_destroy(struct net *net)
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002324{
Ying Xuee05b31f2015-01-09 15:27:08 +08002325 struct tipc_net *tn = net_generic(net, tipc_net_id);
2326
Ying Xue07f6c4b2015-01-07 13:41:58 +08002327 /* Wait for socket readers to complete */
2328 synchronize_net();
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002329
Ying Xuee05b31f2015-01-09 15:27:08 +08002330 rhashtable_destroy(&tn->sk_rht);
Jon Paul Maloy808d90f2014-08-22 18:09:19 -04002331}
2332
2333/**
Ying Xue247f0f32014-02-18 16:06:46 +08002334 * tipc_setsockopt - set socket option
Per Lidenb97bf3f2006-01-02 19:04:38 +01002335 * @sock: socket structure
2336 * @lvl: option level
2337 * @opt: option identifier
2338 * @ov: pointer to new option value
2339 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002340 *
2341 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01002342 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002343 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002344 * Returns 0 on success, errno otherwise
2345 */
Ying Xue247f0f32014-02-18 16:06:46 +08002346static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2347 char __user *ov, unsigned int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002348{
Allan Stephens0c3141e2008-04-15 00:22:02 -07002349 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04002350 struct tipc_sock *tsk = tipc_sk(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002351 u32 value;
2352 int res;
2353
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002354 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2355 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002356 if (lvl != SOL_TIPC)
2357 return -ENOPROTOOPT;
2358 if (ol < sizeof(value))
2359 return -EINVAL;
Allan Stephens2db99832010-12-31 18:59:33 +00002360 res = get_user(value, (u32 __user *)ov);
2361 if (res)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002362 return res;
2363
Allan Stephens0c3141e2008-04-15 00:22:02 -07002364 lock_sock(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002365
Per Lidenb97bf3f2006-01-02 19:04:38 +01002366 switch (opt) {
2367 case TIPC_IMPORTANCE:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002368 res = tsk_set_importance(tsk, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002369 break;
2370 case TIPC_SRC_DROPPABLE:
2371 if (sock->type != SOCK_STREAM)
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002372 tsk_set_unreliable(tsk, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002373 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01002374 res = -ENOPROTOOPT;
2375 break;
2376 case TIPC_DEST_DROPPABLE:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002377 tsk_set_unreturnable(tsk, value);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002378 break;
2379 case TIPC_CONN_TIMEOUT:
Allan Stephensa0f40f02011-05-26 13:44:34 -04002380 tipc_sk(sk)->conn_timeout = value;
Allan Stephens0c3141e2008-04-15 00:22:02 -07002381 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002382 break;
2383 default:
2384 res = -EINVAL;
2385 }
2386
Allan Stephens0c3141e2008-04-15 00:22:02 -07002387 release_sock(sk);
2388
Per Lidenb97bf3f2006-01-02 19:04:38 +01002389 return res;
2390}
2391
2392/**
Ying Xue247f0f32014-02-18 16:06:46 +08002393 * tipc_getsockopt - get socket option
Per Lidenb97bf3f2006-01-02 19:04:38 +01002394 * @sock: socket structure
2395 * @lvl: option level
2396 * @opt: option identifier
2397 * @ov: receptacle for option value
2398 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002399 *
2400 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01002401 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002402 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002403 * Returns 0 on success, errno otherwise
2404 */
Ying Xue247f0f32014-02-18 16:06:46 +08002405static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2406 char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002407{
Allan Stephens0c3141e2008-04-15 00:22:02 -07002408 struct sock *sk = sock->sk;
Jon Paul Maloy58ed9442014-03-12 11:31:12 -04002409 struct tipc_sock *tsk = tipc_sk(sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002410 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002411 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002412 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002413
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002414 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2415 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002416 if (lvl != SOL_TIPC)
2417 return -ENOPROTOOPT;
Allan Stephens2db99832010-12-31 18:59:33 +00002418 res = get_user(len, ol);
2419 if (res)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002420 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002421
Allan Stephens0c3141e2008-04-15 00:22:02 -07002422 lock_sock(sk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002423
2424 switch (opt) {
2425 case TIPC_IMPORTANCE:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002426 value = tsk_importance(tsk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002427 break;
2428 case TIPC_SRC_DROPPABLE:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002429 value = tsk_unreliable(tsk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002430 break;
2431 case TIPC_DEST_DROPPABLE:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002432 value = tsk_unreturnable(tsk);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002433 break;
2434 case TIPC_CONN_TIMEOUT:
Jon Paul Maloy301bae52014-08-22 18:09:20 -04002435 value = tsk->conn_timeout;
Allan Stephens0c3141e2008-04-15 00:22:02 -07002436 /* no need to set "res", since already 0 at this point */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002437 break;
Allan Stephens0e659672010-12-31 18:59:32 +00002438 case TIPC_NODE_RECVQ_DEPTH:
Ying Xue9da3d472012-11-27 06:15:27 -05002439 value = 0; /* was tipc_queue_size, now obsolete */
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00002440 break;
Allan Stephens0e659672010-12-31 18:59:32 +00002441 case TIPC_SOCK_RECVQ_DEPTH:
oscar.medina@motorola.com66506132009-06-30 03:25:39 +00002442 value = skb_queue_len(&sk->sk_receive_queue);
2443 break;
Per Lidenb97bf3f2006-01-02 19:04:38 +01002444 default:
2445 res = -EINVAL;
2446 }
2447
Allan Stephens0c3141e2008-04-15 00:22:02 -07002448 release_sock(sk);
2449
Paul Gortmaker25860c32010-12-31 18:59:31 +00002450 if (res)
2451 return res; /* "get" failed */
Per Lidenb97bf3f2006-01-02 19:04:38 +01002452
Paul Gortmaker25860c32010-12-31 18:59:31 +00002453 if (len < sizeof(value))
2454 return -EINVAL;
2455
2456 if (copy_to_user(ov, &value, sizeof(value)))
2457 return -EFAULT;
2458
2459 return put_user(sizeof(value), ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002460}
2461
Ying Xuef2f98002015-01-09 15:27:05 +08002462static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
Erik Hugne78acb1f2014-04-24 16:26:47 +02002463{
Ying Xuef2f98002015-01-09 15:27:05 +08002464 struct sock *sk = sock->sk;
Erik Hugne78acb1f2014-04-24 16:26:47 +02002465 struct tipc_sioc_ln_req lnr;
2466 void __user *argp = (void __user *)arg;
2467
2468 switch (cmd) {
2469 case SIOCGETLINKNAME:
2470 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2471 return -EFAULT;
Ying Xuef2f98002015-01-09 15:27:05 +08002472 if (!tipc_node_get_linkname(sock_net(sk),
2473 lnr.bearer_id & 0xffff, lnr.peer,
Erik Hugne78acb1f2014-04-24 16:26:47 +02002474 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2475 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2476 return -EFAULT;
2477 return 0;
2478 }
2479 return -EADDRNOTAVAIL;
Erik Hugne78acb1f2014-04-24 16:26:47 +02002480 default:
2481 return -ENOIOCTLCMD;
2482 }
2483}
2484
Ben Hutchingsae86b9e2012-07-10 10:55:35 +00002485/* Protocol switches for the various types of TIPC sockets */
2486
Florian Westphalbca65ea2008-02-07 18:18:01 -08002487static const struct proto_ops msg_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00002488 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002489 .family = AF_TIPC,
Ying Xue247f0f32014-02-18 16:06:46 +08002490 .release = tipc_release,
2491 .bind = tipc_bind,
2492 .connect = tipc_connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07002493 .socketpair = sock_no_socketpair,
Ying Xue245f3d32011-07-06 06:01:13 -04002494 .accept = sock_no_accept,
Ying Xue247f0f32014-02-18 16:06:46 +08002495 .getname = tipc_getname,
2496 .poll = tipc_poll,
Erik Hugne78acb1f2014-04-24 16:26:47 +02002497 .ioctl = tipc_ioctl,
Ying Xue245f3d32011-07-06 06:01:13 -04002498 .listen = sock_no_listen,
Ying Xue247f0f32014-02-18 16:06:46 +08002499 .shutdown = tipc_shutdown,
2500 .setsockopt = tipc_setsockopt,
2501 .getsockopt = tipc_getsockopt,
2502 .sendmsg = tipc_sendmsg,
2503 .recvmsg = tipc_recvmsg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09002504 .mmap = sock_no_mmap,
2505 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01002506};
2507
Florian Westphalbca65ea2008-02-07 18:18:01 -08002508static const struct proto_ops packet_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00002509 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002510 .family = AF_TIPC,
Ying Xue247f0f32014-02-18 16:06:46 +08002511 .release = tipc_release,
2512 .bind = tipc_bind,
2513 .connect = tipc_connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07002514 .socketpair = sock_no_socketpair,
Ying Xue247f0f32014-02-18 16:06:46 +08002515 .accept = tipc_accept,
2516 .getname = tipc_getname,
2517 .poll = tipc_poll,
Erik Hugne78acb1f2014-04-24 16:26:47 +02002518 .ioctl = tipc_ioctl,
Ying Xue247f0f32014-02-18 16:06:46 +08002519 .listen = tipc_listen,
2520 .shutdown = tipc_shutdown,
2521 .setsockopt = tipc_setsockopt,
2522 .getsockopt = tipc_getsockopt,
2523 .sendmsg = tipc_send_packet,
2524 .recvmsg = tipc_recvmsg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09002525 .mmap = sock_no_mmap,
2526 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01002527};
2528
Florian Westphalbca65ea2008-02-07 18:18:01 -08002529static const struct proto_ops stream_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00002530 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002531 .family = AF_TIPC,
Ying Xue247f0f32014-02-18 16:06:46 +08002532 .release = tipc_release,
2533 .bind = tipc_bind,
2534 .connect = tipc_connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07002535 .socketpair = sock_no_socketpair,
Ying Xue247f0f32014-02-18 16:06:46 +08002536 .accept = tipc_accept,
2537 .getname = tipc_getname,
2538 .poll = tipc_poll,
Erik Hugne78acb1f2014-04-24 16:26:47 +02002539 .ioctl = tipc_ioctl,
Ying Xue247f0f32014-02-18 16:06:46 +08002540 .listen = tipc_listen,
2541 .shutdown = tipc_shutdown,
2542 .setsockopt = tipc_setsockopt,
2543 .getsockopt = tipc_getsockopt,
2544 .sendmsg = tipc_send_stream,
2545 .recvmsg = tipc_recv_stream,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09002546 .mmap = sock_no_mmap,
2547 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01002548};
2549
Florian Westphalbca65ea2008-02-07 18:18:01 -08002550static const struct net_proto_family tipc_family_ops = {
Allan Stephens0e659672010-12-31 18:59:32 +00002551 .owner = THIS_MODULE,
Per Lidenb97bf3f2006-01-02 19:04:38 +01002552 .family = AF_TIPC,
Ying Xuec5fa7b32013-06-17 10:54:39 -04002553 .create = tipc_sk_create
Per Lidenb97bf3f2006-01-02 19:04:38 +01002554};
2555
2556static struct proto tipc_proto = {
2557 .name = "TIPC",
2558 .owner = THIS_MODULE,
Ying Xuecc79dd12013-06-17 10:54:37 -04002559 .obj_size = sizeof(struct tipc_sock),
2560 .sysctl_rmem = sysctl_tipc_rmem
Per Lidenb97bf3f2006-01-02 19:04:38 +01002561};
2562
2563/**
Per Liden4323add2006-01-18 00:38:21 +01002564 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002565 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01002566 * Returns 0 on success, errno otherwise
2567 */
Per Liden4323add2006-01-18 00:38:21 +01002568int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002569{
2570 int res;
2571
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09002572 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01002573 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04002574 pr_err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002575 goto out;
2576 }
2577
2578 res = sock_register(&tipc_family_ops);
2579 if (res) {
Erik Hugne2cf8aa12012-06-29 00:16:37 -04002580 pr_err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01002581 proto_unregister(&tipc_proto);
2582 goto out;
2583 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01002584 out:
2585 return res;
2586}
2587
2588/**
Per Liden4323add2006-01-18 00:38:21 +01002589 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01002590 */
Per Liden4323add2006-01-18 00:38:21 +01002591void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01002592{
Per Lidenb97bf3f2006-01-02 19:04:38 +01002593 sock_unregister(tipc_family_ops.family);
2594 proto_unregister(&tipc_proto);
2595}
Richard Alpe34b78a122014-11-20 10:29:10 +01002596
2597/* Caller should hold socket lock for the passed tipc socket. */
Richard Alped8182802014-11-24 11:10:29 +01002598static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
Richard Alpe34b78a122014-11-20 10:29:10 +01002599{
2600 u32 peer_node;
2601 u32 peer_port;
2602 struct nlattr *nest;
2603
2604 peer_node = tsk_peer_node(tsk);
2605 peer_port = tsk_peer_port(tsk);
2606
2607 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2608
2609 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2610 goto msg_full;
2611 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2612 goto msg_full;
2613
2614 if (tsk->conn_type != 0) {
2615 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2616 goto msg_full;
2617 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2618 goto msg_full;
2619 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2620 goto msg_full;
2621 }
2622 nla_nest_end(skb, nest);
2623
2624 return 0;
2625
2626msg_full:
2627 nla_nest_cancel(skb, nest);
2628
2629 return -EMSGSIZE;
2630}
2631
2632/* Caller should hold socket lock for the passed tipc socket. */
Richard Alped8182802014-11-24 11:10:29 +01002633static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2634 struct tipc_sock *tsk)
Richard Alpe34b78a122014-11-20 10:29:10 +01002635{
2636 int err;
2637 void *hdr;
2638 struct nlattr *attrs;
Ying Xue34747532015-01-09 15:27:10 +08002639 struct net *net = sock_net(skb->sk);
2640 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alpe34b78a122014-11-20 10:29:10 +01002641
2642 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
Richard Alpebfb3e5d2015-02-09 09:50:03 +01002643 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
Richard Alpe34b78a122014-11-20 10:29:10 +01002644 if (!hdr)
2645 goto msg_cancel;
2646
2647 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2648 if (!attrs)
2649 goto genlmsg_cancel;
Ying Xue07f6c4b2015-01-07 13:41:58 +08002650 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
Richard Alpe34b78a122014-11-20 10:29:10 +01002651 goto attr_msg_cancel;
Ying Xue34747532015-01-09 15:27:10 +08002652 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
Richard Alpe34b78a122014-11-20 10:29:10 +01002653 goto attr_msg_cancel;
2654
2655 if (tsk->connected) {
2656 err = __tipc_nl_add_sk_con(skb, tsk);
2657 if (err)
2658 goto attr_msg_cancel;
2659 } else if (!list_empty(&tsk->publications)) {
2660 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2661 goto attr_msg_cancel;
2662 }
2663 nla_nest_end(skb, attrs);
2664 genlmsg_end(skb, hdr);
2665
2666 return 0;
2667
2668attr_msg_cancel:
2669 nla_nest_cancel(skb, attrs);
2670genlmsg_cancel:
2671 genlmsg_cancel(skb, hdr);
2672msg_cancel:
2673 return -EMSGSIZE;
2674}
2675
2676int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2677{
2678 int err;
2679 struct tipc_sock *tsk;
Ying Xue07f6c4b2015-01-07 13:41:58 +08002680 const struct bucket_table *tbl;
2681 struct rhash_head *pos;
Ying Xuee05b31f2015-01-09 15:27:08 +08002682 struct net *net = sock_net(skb->sk);
2683 struct tipc_net *tn = net_generic(net, tipc_net_id);
Richard Alped6e164e2015-01-16 12:30:40 +01002684 u32 tbl_id = cb->args[0];
2685 u32 prev_portid = cb->args[1];
Richard Alpe34b78a122014-11-20 10:29:10 +01002686
Ying Xue07f6c4b2015-01-07 13:41:58 +08002687 rcu_read_lock();
Ying Xuee05b31f2015-01-09 15:27:08 +08002688 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
Richard Alped6e164e2015-01-16 12:30:40 +01002689 for (; tbl_id < tbl->size; tbl_id++) {
2690 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
Ying Xue07f6c4b2015-01-07 13:41:58 +08002691 spin_lock_bh(&tsk->sk.sk_lock.slock);
Richard Alped6e164e2015-01-16 12:30:40 +01002692 if (prev_portid && prev_portid != tsk->portid) {
2693 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2694 continue;
2695 }
Richard Alpe34b78a122014-11-20 10:29:10 +01002696
Richard Alped6e164e2015-01-16 12:30:40 +01002697 err = __tipc_nl_add_sk(skb, cb, tsk);
2698 if (err) {
2699 prev_portid = tsk->portid;
2700 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2701 goto out;
2702 }
2703 prev_portid = 0;
2704 spin_unlock_bh(&tsk->sk.sk_lock.slock);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002705 }
Richard Alpe34b78a122014-11-20 10:29:10 +01002706 }
Richard Alped6e164e2015-01-16 12:30:40 +01002707out:
Ying Xue07f6c4b2015-01-07 13:41:58 +08002708 rcu_read_unlock();
Richard Alped6e164e2015-01-16 12:30:40 +01002709 cb->args[0] = tbl_id;
2710 cb->args[1] = prev_portid;
Richard Alpe34b78a122014-11-20 10:29:10 +01002711
2712 return skb->len;
2713}
Richard Alpe1a1a1432014-11-20 10:29:11 +01002714
2715/* Caller should hold socket lock for the passed tipc socket. */
Richard Alped8182802014-11-24 11:10:29 +01002716static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2717 struct netlink_callback *cb,
2718 struct publication *publ)
Richard Alpe1a1a1432014-11-20 10:29:11 +01002719{
2720 void *hdr;
2721 struct nlattr *attrs;
2722
2723 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
Richard Alpebfb3e5d2015-02-09 09:50:03 +01002724 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
Richard Alpe1a1a1432014-11-20 10:29:11 +01002725 if (!hdr)
2726 goto msg_cancel;
2727
2728 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2729 if (!attrs)
2730 goto genlmsg_cancel;
2731
2732 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2733 goto attr_msg_cancel;
2734 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2735 goto attr_msg_cancel;
2736 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2737 goto attr_msg_cancel;
2738 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2739 goto attr_msg_cancel;
2740
2741 nla_nest_end(skb, attrs);
2742 genlmsg_end(skb, hdr);
2743
2744 return 0;
2745
2746attr_msg_cancel:
2747 nla_nest_cancel(skb, attrs);
2748genlmsg_cancel:
2749 genlmsg_cancel(skb, hdr);
2750msg_cancel:
2751 return -EMSGSIZE;
2752}
2753
2754/* Caller should hold socket lock for the passed tipc socket. */
Richard Alped8182802014-11-24 11:10:29 +01002755static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2756 struct netlink_callback *cb,
2757 struct tipc_sock *tsk, u32 *last_publ)
Richard Alpe1a1a1432014-11-20 10:29:11 +01002758{
2759 int err;
2760 struct publication *p;
2761
2762 if (*last_publ) {
2763 list_for_each_entry(p, &tsk->publications, pport_list) {
2764 if (p->key == *last_publ)
2765 break;
2766 }
2767 if (p->key != *last_publ) {
2768 /* We never set seq or call nl_dump_check_consistent()
2769 * this means that setting prev_seq here will cause the
2770 * consistence check to fail in the netlink callback
2771 * handler. Resulting in the last NLMSG_DONE message
2772 * having the NLM_F_DUMP_INTR flag set.
2773 */
2774 cb->prev_seq = 1;
2775 *last_publ = 0;
2776 return -EPIPE;
2777 }
2778 } else {
2779 p = list_first_entry(&tsk->publications, struct publication,
2780 pport_list);
2781 }
2782
2783 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2784 err = __tipc_nl_add_sk_publ(skb, cb, p);
2785 if (err) {
2786 *last_publ = p->key;
2787 return err;
2788 }
2789 }
2790 *last_publ = 0;
2791
2792 return 0;
2793}
2794
2795int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2796{
2797 int err;
Ying Xue07f6c4b2015-01-07 13:41:58 +08002798 u32 tsk_portid = cb->args[0];
Richard Alpe1a1a1432014-11-20 10:29:11 +01002799 u32 last_publ = cb->args[1];
2800 u32 done = cb->args[2];
Ying Xuee05b31f2015-01-09 15:27:08 +08002801 struct net *net = sock_net(skb->sk);
Richard Alpe1a1a1432014-11-20 10:29:11 +01002802 struct tipc_sock *tsk;
2803
Ying Xue07f6c4b2015-01-07 13:41:58 +08002804 if (!tsk_portid) {
Richard Alpe1a1a1432014-11-20 10:29:11 +01002805 struct nlattr **attrs;
2806 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2807
2808 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2809 if (err)
2810 return err;
2811
2812 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2813 attrs[TIPC_NLA_SOCK],
2814 tipc_nl_sock_policy);
2815 if (err)
2816 return err;
2817
2818 if (!sock[TIPC_NLA_SOCK_REF])
2819 return -EINVAL;
2820
Ying Xue07f6c4b2015-01-07 13:41:58 +08002821 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
Richard Alpe1a1a1432014-11-20 10:29:11 +01002822 }
2823
2824 if (done)
2825 return 0;
2826
Ying Xuee05b31f2015-01-09 15:27:08 +08002827 tsk = tipc_sk_lookup(net, tsk_portid);
Richard Alpe1a1a1432014-11-20 10:29:11 +01002828 if (!tsk)
2829 return -EINVAL;
2830
2831 lock_sock(&tsk->sk);
2832 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
2833 if (!err)
2834 done = 1;
2835 release_sock(&tsk->sk);
Ying Xue07f6c4b2015-01-07 13:41:58 +08002836 sock_put(&tsk->sk);
Richard Alpe1a1a1432014-11-20 10:29:11 +01002837
Ying Xue07f6c4b2015-01-07 13:41:58 +08002838 cb->args[0] = tsk_portid;
Richard Alpe1a1a1432014-11-20 10:29:11 +01002839 cb->args[1] = last_publ;
2840 cb->args[2] = done;
2841
2842 return skb->len;
2843}