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Commit | Line | Data |
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b97bf3fd | 1 | /* |
02c00c2a | 2 | * net/tipc/socket.c: TIPC socket API |
c4307285 | 3 | * |
3c724acd | 4 | * Copyright (c) 2001-2007, 2012-2015, Ericsson AB |
c5fa7b3c | 5 | * Copyright (c) 2004-2008, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
07f6c4bc | 37 | #include <linux/rhashtable.h> |
b97bf3fd | 38 | #include "core.h" |
e2dafe87 | 39 | #include "name_table.h" |
78acb1f9 | 40 | #include "node.h" |
e2dafe87 | 41 | #include "link.h" |
c637c103 | 42 | #include "name_distr.h" |
2e84c60b | 43 | #include "socket.h" |
a6bf70f7 | 44 | #include "bcast.h" |
49cc66ea | 45 | #include "netlink.h" |
2cf8aa19 | 46 | |
07f6c4bc YX |
47 | #define SS_LISTENING -1 /* socket is listening */ |
48 | #define SS_READY -2 /* socket is connectionless */ | |
b97bf3fd | 49 | |
07f6c4bc | 50 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
2f55c437 | 51 | #define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */ |
07f6c4bc YX |
52 | #define TIPC_FWD_MSG 1 |
53 | #define TIPC_CONN_OK 0 | |
54 | #define TIPC_CONN_PROBING 1 | |
55 | #define TIPC_MAX_PORT 0xffffffff | |
56 | #define TIPC_MIN_PORT 1 | |
301bae56 JPM |
57 | |
58 | /** | |
59 | * struct tipc_sock - TIPC socket structure | |
60 | * @sk: socket - interacts with 'port' and with user via the socket API | |
61 | * @connected: non-zero if port is currently connected to a peer port | |
62 | * @conn_type: TIPC type used when connection was established | |
63 | * @conn_instance: TIPC instance used when connection was established | |
64 | * @published: non-zero if port has one or more associated names | |
65 | * @max_pkt: maximum packet size "hint" used when building messages sent by port | |
07f6c4bc | 66 | * @portid: unique port identity in TIPC socket hash table |
301bae56 JPM |
67 | * @phdr: preformatted message header used when sending messages |
68 | * @port_list: adjacent ports in TIPC's global list of ports | |
69 | * @publications: list of publications for port | |
70 | * @pub_count: total # of publications port has made during its lifetime | |
71 | * @probing_state: | |
2f55c437 | 72 | * @probing_intv: |
301bae56 JPM |
73 | * @conn_timeout: the time we can wait for an unresponded setup request |
74 | * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue | |
75 | * @link_cong: non-zero if owner must sleep because of link congestion | |
76 | * @sent_unacked: # messages sent by socket, and not yet acked by peer | |
77 | * @rcv_unacked: # messages read by user, but not yet acked back to peer | |
f2f8036e | 78 | * @remote: 'connected' peer for dgram/rdm |
07f6c4bc YX |
79 | * @node: hash table node |
80 | * @rcu: rcu struct for tipc_sock | |
301bae56 JPM |
81 | */ |
82 | struct tipc_sock { | |
83 | struct sock sk; | |
84 | int connected; | |
85 | u32 conn_type; | |
86 | u32 conn_instance; | |
87 | int published; | |
88 | u32 max_pkt; | |
07f6c4bc | 89 | u32 portid; |
301bae56 JPM |
90 | struct tipc_msg phdr; |
91 | struct list_head sock_list; | |
92 | struct list_head publications; | |
93 | u32 pub_count; | |
94 | u32 probing_state; | |
2f55c437 | 95 | unsigned long probing_intv; |
301bae56 JPM |
96 | uint conn_timeout; |
97 | atomic_t dupl_rcvcnt; | |
98 | bool link_cong; | |
10724cc7 JPM |
99 | u16 snt_unacked; |
100 | u16 snd_win; | |
60020e18 | 101 | u16 peer_caps; |
10724cc7 JPM |
102 | u16 rcv_unacked; |
103 | u16 rcv_win; | |
f2f8036e | 104 | struct sockaddr_tipc remote; |
07f6c4bc YX |
105 | struct rhash_head node; |
106 | struct rcu_head rcu; | |
301bae56 | 107 | }; |
b97bf3fd | 108 | |
4f4482dc | 109 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 110 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 111 | static void tipc_write_space(struct sock *sk); |
f4195d1e | 112 | static void tipc_sock_destruct(struct sock *sk); |
247f0f3c YX |
113 | static int tipc_release(struct socket *sock); |
114 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
0abd8ff2 | 115 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p); |
f2f2a96a | 116 | static void tipc_sk_timeout(unsigned long data); |
301bae56 | 117 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae | 118 | struct tipc_name_seq const *seq); |
301bae56 | 119 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae | 120 | struct tipc_name_seq const *seq); |
e05b31f4 | 121 | static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); |
07f6c4bc YX |
122 | static int tipc_sk_insert(struct tipc_sock *tsk); |
123 | static void tipc_sk_remove(struct tipc_sock *tsk); | |
39a0295f YX |
124 | static int __tipc_send_stream(struct socket *sock, struct msghdr *m, |
125 | size_t dsz); | |
126 | static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz); | |
b97bf3fd | 127 | |
bca65eae FW |
128 | static const struct proto_ops packet_ops; |
129 | static const struct proto_ops stream_ops; | |
130 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
131 | static struct proto tipc_proto; |
132 | ||
6cca7289 HX |
133 | static const struct rhashtable_params tsk_rht_params; |
134 | ||
c4307285 | 135 | /* |
0c3141e9 AS |
136 | * Revised TIPC socket locking policy: |
137 | * | |
138 | * Most socket operations take the standard socket lock when they start | |
139 | * and hold it until they finish (or until they need to sleep). Acquiring | |
140 | * this lock grants the owner exclusive access to the fields of the socket | |
141 | * data structures, with the exception of the backlog queue. A few socket | |
142 | * operations can be done without taking the socket lock because they only | |
143 | * read socket information that never changes during the life of the socket. | |
144 | * | |
145 | * Socket operations may acquire the lock for the associated TIPC port if they | |
146 | * need to perform an operation on the port. If any routine needs to acquire | |
147 | * both the socket lock and the port lock it must take the socket lock first | |
148 | * to avoid the risk of deadlock. | |
149 | * | |
150 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
151 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
152 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
153 | * and either handles the message itself or adds it to the socket's backlog | |
154 | * queue; in the latter case the queued message is processed once the process | |
155 | * owning the socket lock releases it. | |
156 | * | |
157 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
158 | * the problem of a blocked socket operation preventing any other operations | |
159 | * from occurring. However, applications must be careful if they have | |
160 | * multiple threads trying to send (or receive) on the same socket, as these | |
161 | * operations might interfere with each other. For example, doing a connect | |
162 | * and a receive at the same time might allow the receive to consume the | |
163 | * ACK message meant for the connect. While additional work could be done | |
164 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
165 | * | |
166 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
167 | * that another operation that must be performed in a non-blocking manner is | |
168 | * not delayed for very long because the lock has already been taken. | |
169 | * | |
170 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
171 | * constant over its lifetime; such fields can be examined without taking | |
172 | * the socket lock and/or port lock, and do not need to be re-read even | |
173 | * after resuming processing after waiting. These fields include: | |
174 | * - socket type | |
175 | * - pointer to socket sk structure (aka tipc_sock structure) | |
176 | * - pointer to port structure | |
177 | * - port reference | |
178 | */ | |
179 | ||
c5898636 JPM |
180 | static u32 tsk_own_node(struct tipc_sock *tsk) |
181 | { | |
182 | return msg_prevnode(&tsk->phdr); | |
183 | } | |
184 | ||
301bae56 | 185 | static u32 tsk_peer_node(struct tipc_sock *tsk) |
2e84c60b | 186 | { |
301bae56 | 187 | return msg_destnode(&tsk->phdr); |
2e84c60b JPM |
188 | } |
189 | ||
301bae56 | 190 | static u32 tsk_peer_port(struct tipc_sock *tsk) |
2e84c60b | 191 | { |
301bae56 | 192 | return msg_destport(&tsk->phdr); |
2e84c60b JPM |
193 | } |
194 | ||
301bae56 | 195 | static bool tsk_unreliable(struct tipc_sock *tsk) |
2e84c60b | 196 | { |
301bae56 | 197 | return msg_src_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
198 | } |
199 | ||
301bae56 | 200 | static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) |
2e84c60b | 201 | { |
301bae56 | 202 | msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); |
2e84c60b JPM |
203 | } |
204 | ||
301bae56 | 205 | static bool tsk_unreturnable(struct tipc_sock *tsk) |
2e84c60b | 206 | { |
301bae56 | 207 | return msg_dest_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
208 | } |
209 | ||
301bae56 | 210 | static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) |
2e84c60b | 211 | { |
301bae56 | 212 | msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); |
2e84c60b JPM |
213 | } |
214 | ||
301bae56 | 215 | static int tsk_importance(struct tipc_sock *tsk) |
2e84c60b | 216 | { |
301bae56 | 217 | return msg_importance(&tsk->phdr); |
2e84c60b JPM |
218 | } |
219 | ||
301bae56 | 220 | static int tsk_set_importance(struct tipc_sock *tsk, int imp) |
2e84c60b JPM |
221 | { |
222 | if (imp > TIPC_CRITICAL_IMPORTANCE) | |
223 | return -EINVAL; | |
301bae56 | 224 | msg_set_importance(&tsk->phdr, (u32)imp); |
2e84c60b JPM |
225 | return 0; |
226 | } | |
8826cde6 | 227 | |
301bae56 JPM |
228 | static struct tipc_sock *tipc_sk(const struct sock *sk) |
229 | { | |
230 | return container_of(sk, struct tipc_sock, sk); | |
231 | } | |
232 | ||
10724cc7 | 233 | static bool tsk_conn_cong(struct tipc_sock *tsk) |
301bae56 | 234 | { |
10724cc7 JPM |
235 | return tsk->snt_unacked >= tsk->snd_win; |
236 | } | |
237 | ||
238 | /* tsk_blocks(): translate a buffer size in bytes to number of | |
239 | * advertisable blocks, taking into account the ratio truesize(len)/len | |
240 | * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ | |
241 | */ | |
242 | static u16 tsk_adv_blocks(int len) | |
243 | { | |
244 | return len / FLOWCTL_BLK_SZ / 4; | |
245 | } | |
246 | ||
247 | /* tsk_inc(): increment counter for sent or received data | |
248 | * - If block based flow control is not supported by peer we | |
249 | * fall back to message based ditto, incrementing the counter | |
250 | */ | |
251 | static u16 tsk_inc(struct tipc_sock *tsk, int msglen) | |
252 | { | |
253 | if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) | |
254 | return ((msglen / FLOWCTL_BLK_SZ) + 1); | |
255 | return 1; | |
301bae56 JPM |
256 | } |
257 | ||
0c3141e9 | 258 | /** |
2e84c60b | 259 | * tsk_advance_rx_queue - discard first buffer in socket receive queue |
0c3141e9 AS |
260 | * |
261 | * Caller must hold socket lock | |
b97bf3fd | 262 | */ |
2e84c60b | 263 | static void tsk_advance_rx_queue(struct sock *sk) |
b97bf3fd | 264 | { |
5f6d9123 | 265 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
266 | } |
267 | ||
bcd3ffd4 JPM |
268 | /* tipc_sk_respond() : send response message back to sender |
269 | */ | |
270 | static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err) | |
271 | { | |
272 | u32 selector; | |
273 | u32 dnode; | |
274 | u32 onode = tipc_own_addr(sock_net(sk)); | |
275 | ||
276 | if (!tipc_msg_reverse(onode, &skb, err)) | |
277 | return; | |
278 | ||
279 | dnode = msg_destnode(buf_msg(skb)); | |
280 | selector = msg_origport(buf_msg(skb)); | |
281 | tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector); | |
282 | } | |
283 | ||
b97bf3fd | 284 | /** |
2e84c60b | 285 | * tsk_rej_rx_queue - reject all buffers in socket receive queue |
0c3141e9 AS |
286 | * |
287 | * Caller must hold socket lock | |
b97bf3fd | 288 | */ |
2e84c60b | 289 | static void tsk_rej_rx_queue(struct sock *sk) |
b97bf3fd | 290 | { |
a6ca1094 | 291 | struct sk_buff *skb; |
0c3141e9 | 292 | |
bcd3ffd4 JPM |
293 | while ((skb = __skb_dequeue(&sk->sk_receive_queue))) |
294 | tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT); | |
b97bf3fd PL |
295 | } |
296 | ||
2e84c60b | 297 | /* tsk_peer_msg - verify if message was sent by connected port's peer |
0fc87aae JPM |
298 | * |
299 | * Handles cases where the node's network address has changed from | |
300 | * the default of <0.0.0> to its configured setting. | |
301 | */ | |
2e84c60b | 302 | static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) |
0fc87aae | 303 | { |
34747539 | 304 | struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id); |
301bae56 | 305 | u32 peer_port = tsk_peer_port(tsk); |
0fc87aae JPM |
306 | u32 orig_node; |
307 | u32 peer_node; | |
308 | ||
301bae56 | 309 | if (unlikely(!tsk->connected)) |
0fc87aae JPM |
310 | return false; |
311 | ||
312 | if (unlikely(msg_origport(msg) != peer_port)) | |
313 | return false; | |
314 | ||
315 | orig_node = msg_orignode(msg); | |
301bae56 | 316 | peer_node = tsk_peer_node(tsk); |
0fc87aae JPM |
317 | |
318 | if (likely(orig_node == peer_node)) | |
319 | return true; | |
320 | ||
34747539 | 321 | if (!orig_node && (peer_node == tn->own_addr)) |
0fc87aae JPM |
322 | return true; |
323 | ||
34747539 | 324 | if (!peer_node && (orig_node == tn->own_addr)) |
0fc87aae JPM |
325 | return true; |
326 | ||
327 | return false; | |
328 | } | |
329 | ||
b97bf3fd | 330 | /** |
c5fa7b3c | 331 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 332 | * @net: network namespace (must be default network) |
b97bf3fd PL |
333 | * @sock: pre-allocated socket structure |
334 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 335 | * @kern: caused by kernel or by userspace? |
c4307285 | 336 | * |
0c3141e9 AS |
337 | * This routine creates additional data structures used by the TIPC socket, |
338 | * initializes them, and links them together. | |
b97bf3fd PL |
339 | * |
340 | * Returns 0 on success, errno otherwise | |
341 | */ | |
58ed9442 JPM |
342 | static int tipc_sk_create(struct net *net, struct socket *sock, |
343 | int protocol, int kern) | |
b97bf3fd | 344 | { |
c5898636 | 345 | struct tipc_net *tn; |
0c3141e9 AS |
346 | const struct proto_ops *ops; |
347 | socket_state state; | |
b97bf3fd | 348 | struct sock *sk; |
58ed9442 | 349 | struct tipc_sock *tsk; |
5b8fa7ce | 350 | struct tipc_msg *msg; |
0c3141e9 AS |
351 | |
352 | /* Validate arguments */ | |
b97bf3fd PL |
353 | if (unlikely(protocol != 0)) |
354 | return -EPROTONOSUPPORT; | |
355 | ||
b97bf3fd PL |
356 | switch (sock->type) { |
357 | case SOCK_STREAM: | |
0c3141e9 AS |
358 | ops = &stream_ops; |
359 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
360 | break; |
361 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
362 | ops = &packet_ops; |
363 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
364 | break; |
365 | case SOCK_DGRAM: | |
b97bf3fd | 366 | case SOCK_RDM: |
0c3141e9 AS |
367 | ops = &msg_ops; |
368 | state = SS_READY; | |
b97bf3fd | 369 | break; |
49978651 | 370 | default: |
49978651 | 371 | return -EPROTOTYPE; |
b97bf3fd PL |
372 | } |
373 | ||
0c3141e9 | 374 | /* Allocate socket's protocol area */ |
11aa9c28 | 375 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern); |
0c3141e9 | 376 | if (sk == NULL) |
b97bf3fd | 377 | return -ENOMEM; |
b97bf3fd | 378 | |
58ed9442 | 379 | tsk = tipc_sk(sk); |
301bae56 | 380 | tsk->max_pkt = MAX_PKT_DEFAULT; |
301bae56 JPM |
381 | INIT_LIST_HEAD(&tsk->publications); |
382 | msg = &tsk->phdr; | |
c5898636 JPM |
383 | tn = net_generic(sock_net(sk), tipc_net_id); |
384 | tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, | |
5b8fa7ce | 385 | NAMED_H_SIZE, 0); |
b97bf3fd | 386 | |
0c3141e9 | 387 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
388 | sock->ops = ops; |
389 | sock->state = state; | |
0c3141e9 | 390 | sock_init_data(sock, sk); |
07f6c4bc | 391 | if (tipc_sk_insert(tsk)) { |
c19ca6cb | 392 | pr_warn("Socket create failed; port number exhausted\n"); |
07f6c4bc YX |
393 | return -EINVAL; |
394 | } | |
395 | msg_set_origport(msg, tsk->portid); | |
3721e9c7 | 396 | setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk); |
4f4482dc | 397 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 398 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
399 | sk->sk_data_ready = tipc_data_ready; |
400 | sk->sk_write_space = tipc_write_space; | |
f4195d1e | 401 | sk->sk_destruct = tipc_sock_destruct; |
4f4482dc JPM |
402 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
403 | atomic_set(&tsk->dupl_rcvcnt, 0); | |
7ef43eba | 404 | |
10724cc7 JPM |
405 | /* Start out with safe limits until we receive an advertised window */ |
406 | tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN); | |
407 | tsk->rcv_win = tsk->snd_win; | |
408 | ||
0c3141e9 | 409 | if (sock->state == SS_READY) { |
301bae56 | 410 | tsk_set_unreturnable(tsk, true); |
0c3141e9 | 411 | if (sock->type == SOCK_DGRAM) |
301bae56 | 412 | tsk_set_unreliable(tsk, true); |
0c3141e9 | 413 | } |
b97bf3fd PL |
414 | return 0; |
415 | } | |
416 | ||
07f6c4bc YX |
417 | static void tipc_sk_callback(struct rcu_head *head) |
418 | { | |
419 | struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); | |
420 | ||
421 | sock_put(&tsk->sk); | |
422 | } | |
423 | ||
b97bf3fd | 424 | /** |
247f0f3c | 425 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
426 | * @sock: socket to destroy |
427 | * | |
428 | * This routine cleans up any messages that are still queued on the socket. | |
429 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
430 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
431 | * and any others are discarded. (If the first message on a STREAM socket | |
432 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 433 | * |
b97bf3fd PL |
434 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
435 | * are returned or discarded according to the "destination droppable" setting | |
436 | * specified for the message by the sender. | |
437 | * | |
438 | * Returns 0 on success, errno otherwise | |
439 | */ | |
247f0f3c | 440 | static int tipc_release(struct socket *sock) |
b97bf3fd | 441 | { |
b97bf3fd | 442 | struct sock *sk = sock->sk; |
357c4774 | 443 | struct net *net; |
58ed9442 | 444 | struct tipc_sock *tsk; |
a6ca1094 | 445 | struct sk_buff *skb; |
1ea23a21 | 446 | u32 dnode; |
b97bf3fd | 447 | |
0c3141e9 AS |
448 | /* |
449 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
450 | * releases a pre-allocated child socket that was never used) | |
451 | */ | |
0c3141e9 | 452 | if (sk == NULL) |
b97bf3fd | 453 | return 0; |
c4307285 | 454 | |
357c4774 | 455 | net = sock_net(sk); |
58ed9442 | 456 | tsk = tipc_sk(sk); |
0c3141e9 AS |
457 | lock_sock(sk); |
458 | ||
459 | /* | |
460 | * Reject all unreceived messages, except on an active connection | |
461 | * (which disconnects locally & sends a 'FIN+' to peer) | |
462 | */ | |
301bae56 | 463 | dnode = tsk_peer_node(tsk); |
b97bf3fd | 464 | while (sock->state != SS_DISCONNECTING) { |
a6ca1094 YX |
465 | skb = __skb_dequeue(&sk->sk_receive_queue); |
466 | if (skb == NULL) | |
b97bf3fd | 467 | break; |
a6ca1094 YX |
468 | if (TIPC_SKB_CB(skb)->handle != NULL) |
469 | kfree_skb(skb); | |
0c3141e9 AS |
470 | else { |
471 | if ((sock->state == SS_CONNECTING) || | |
472 | (sock->state == SS_CONNECTED)) { | |
473 | sock->state = SS_DISCONNECTING; | |
301bae56 | 474 | tsk->connected = 0; |
f2f9800d | 475 | tipc_node_remove_conn(net, dnode, tsk->portid); |
0c3141e9 | 476 | } |
bcd3ffd4 | 477 | tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT); |
0c3141e9 | 478 | } |
b97bf3fd PL |
479 | } |
480 | ||
301bae56 | 481 | tipc_sk_withdraw(tsk, 0, NULL); |
1ea23a21 | 482 | sk_stop_timer(sk, &sk->sk_timer); |
07f6c4bc | 483 | tipc_sk_remove(tsk); |
301bae56 | 484 | if (tsk->connected) { |
c5898636 | 485 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
34747539 | 486 | TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, |
c5898636 | 487 | tsk_own_node(tsk), tsk_peer_port(tsk), |
07f6c4bc | 488 | tsk->portid, TIPC_ERR_NO_PORT); |
a6ca1094 | 489 | if (skb) |
af9b028e | 490 | tipc_node_xmit_skb(net, skb, dnode, tsk->portid); |
f2f9800d | 491 | tipc_node_remove_conn(net, dnode, tsk->portid); |
5b8fa7ce | 492 | } |
b97bf3fd | 493 | |
0c3141e9 | 494 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
495 | sock->state = SS_DISCONNECTING; |
496 | release_sock(sk); | |
07f6c4bc YX |
497 | |
498 | call_rcu(&tsk->rcu, tipc_sk_callback); | |
0c3141e9 | 499 | sock->sk = NULL; |
b97bf3fd | 500 | |
065d7e39 | 501 | return 0; |
b97bf3fd PL |
502 | } |
503 | ||
504 | /** | |
247f0f3c | 505 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
506 | * @sock: socket structure |
507 | * @uaddr: socket address describing name(s) and desired operation | |
508 | * @uaddr_len: size of socket address data structure | |
c4307285 | 509 | * |
b97bf3fd PL |
510 | * Name and name sequence binding is indicated using a positive scope value; |
511 | * a negative scope value unbinds the specified name. Specifying no name | |
512 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 513 | * |
b97bf3fd | 514 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
515 | * |
516 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
517 | * access any non-constant socket information. | |
b97bf3fd | 518 | */ |
247f0f3c YX |
519 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
520 | int uaddr_len) | |
b97bf3fd | 521 | { |
84602761 | 522 | struct sock *sk = sock->sk; |
b97bf3fd | 523 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 524 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 525 | int res = -EINVAL; |
b97bf3fd | 526 | |
84602761 YX |
527 | lock_sock(sk); |
528 | if (unlikely(!uaddr_len)) { | |
301bae56 | 529 | res = tipc_sk_withdraw(tsk, 0, NULL); |
84602761 YX |
530 | goto exit; |
531 | } | |
c4307285 | 532 | |
84602761 YX |
533 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
534 | res = -EINVAL; | |
535 | goto exit; | |
536 | } | |
537 | if (addr->family != AF_TIPC) { | |
538 | res = -EAFNOSUPPORT; | |
539 | goto exit; | |
540 | } | |
b97bf3fd | 541 | |
b97bf3fd PL |
542 | if (addr->addrtype == TIPC_ADDR_NAME) |
543 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
544 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
545 | res = -EAFNOSUPPORT; | |
546 | goto exit; | |
547 | } | |
c4307285 | 548 | |
13a2e898 | 549 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 550 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
551 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
552 | res = -EACCES; | |
553 | goto exit; | |
554 | } | |
c422f1bd | 555 | |
84602761 | 556 | res = (addr->scope > 0) ? |
301bae56 JPM |
557 | tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : |
558 | tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
559 | exit: |
560 | release_sock(sk); | |
561 | return res; | |
b97bf3fd PL |
562 | } |
563 | ||
c4307285 | 564 | /** |
247f0f3c | 565 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
566 | * @sock: socket structure |
567 | * @uaddr: area for returned socket address | |
568 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 569 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 570 | * |
b97bf3fd | 571 | * Returns 0 on success, errno otherwise |
0c3141e9 | 572 | * |
2da59918 AS |
573 | * NOTE: This routine doesn't need to take the socket lock since it only |
574 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 575 | * a completely predictable manner). |
b97bf3fd | 576 | */ |
247f0f3c YX |
577 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
578 | int *uaddr_len, int peer) | |
b97bf3fd | 579 | { |
b97bf3fd | 580 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 581 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
34747539 | 582 | struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id); |
b97bf3fd | 583 | |
88f8a5e3 | 584 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 585 | if (peer) { |
2da59918 AS |
586 | if ((sock->state != SS_CONNECTED) && |
587 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
588 | return -ENOTCONN; | |
301bae56 JPM |
589 | addr->addr.id.ref = tsk_peer_port(tsk); |
590 | addr->addr.id.node = tsk_peer_node(tsk); | |
0c3141e9 | 591 | } else { |
07f6c4bc | 592 | addr->addr.id.ref = tsk->portid; |
34747539 | 593 | addr->addr.id.node = tn->own_addr; |
0c3141e9 | 594 | } |
b97bf3fd PL |
595 | |
596 | *uaddr_len = sizeof(*addr); | |
597 | addr->addrtype = TIPC_ADDR_ID; | |
598 | addr->family = AF_TIPC; | |
599 | addr->scope = 0; | |
b97bf3fd PL |
600 | addr->addr.name.domain = 0; |
601 | ||
0c3141e9 | 602 | return 0; |
b97bf3fd PL |
603 | } |
604 | ||
605 | /** | |
247f0f3c | 606 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
607 | * @file: file structure associated with the socket |
608 | * @sock: socket for which to calculate the poll bits | |
609 | * @wait: ??? | |
610 | * | |
9b674e82 AS |
611 | * Returns pollmask value |
612 | * | |
613 | * COMMENTARY: | |
614 | * It appears that the usual socket locking mechanisms are not useful here | |
615 | * since the pollmask info is potentially out-of-date the moment this routine | |
616 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
617 | * to handle any preventable race conditions, so TIPC will do the same ... | |
618 | * | |
619 | * TIPC sets the returned events as follows: | |
f662c070 AS |
620 | * |
621 | * socket state flags set | |
622 | * ------------ --------- | |
623 | * unconnected no read flags | |
c4fc298a | 624 | * POLLOUT if port is not congested |
f662c070 AS |
625 | * |
626 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
627 | * no write flags | |
628 | * | |
629 | * connected POLLIN/POLLRDNORM if data in rx queue | |
630 | * POLLOUT if port is not congested | |
631 | * | |
632 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
633 | * no write flags | |
634 | * | |
635 | * listening POLLIN if SYN in rx queue | |
636 | * no write flags | |
637 | * | |
638 | * ready POLLIN/POLLRDNORM if data in rx queue | |
639 | * [connectionless] POLLOUT (since port cannot be congested) | |
640 | * | |
641 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
642 | * imply that the operation will succeed, merely that it should be performed | |
643 | * and will not block. | |
b97bf3fd | 644 | */ |
247f0f3c YX |
645 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
646 | poll_table *wait) | |
b97bf3fd | 647 | { |
9b674e82 | 648 | struct sock *sk = sock->sk; |
58ed9442 | 649 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 650 | u32 mask = 0; |
9b674e82 | 651 | |
f288bef4 | 652 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 653 | |
f662c070 | 654 | switch ((int)sock->state) { |
c4fc298a | 655 | case SS_UNCONNECTED: |
60120526 | 656 | if (!tsk->link_cong) |
c4fc298a EH |
657 | mask |= POLLOUT; |
658 | break; | |
f662c070 AS |
659 | case SS_READY: |
660 | case SS_CONNECTED: | |
301bae56 | 661 | if (!tsk->link_cong && !tsk_conn_cong(tsk)) |
f662c070 AS |
662 | mask |= POLLOUT; |
663 | /* fall thru' */ | |
664 | case SS_CONNECTING: | |
665 | case SS_LISTENING: | |
666 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
667 | mask |= (POLLIN | POLLRDNORM); | |
668 | break; | |
669 | case SS_DISCONNECTING: | |
670 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
671 | break; | |
672 | } | |
9b674e82 AS |
673 | |
674 | return mask; | |
b97bf3fd PL |
675 | } |
676 | ||
0abd8ff2 JPM |
677 | /** |
678 | * tipc_sendmcast - send multicast message | |
679 | * @sock: socket structure | |
680 | * @seq: destination address | |
562640f3 | 681 | * @msg: message to send |
0abd8ff2 JPM |
682 | * @dsz: total length of message data |
683 | * @timeo: timeout to wait for wakeup | |
684 | * | |
685 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
686 | * Returns the number of bytes sent on success, or errno | |
687 | */ | |
688 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
562640f3 | 689 | struct msghdr *msg, size_t dsz, long timeo) |
0abd8ff2 JPM |
690 | { |
691 | struct sock *sk = sock->sk; | |
c5898636 | 692 | struct tipc_sock *tsk = tipc_sk(sk); |
f2f9800d | 693 | struct net *net = sock_net(sk); |
c5898636 | 694 | struct tipc_msg *mhdr = &tsk->phdr; |
f214fc40 | 695 | struct sk_buff_head pktchain; |
f25dcc76 | 696 | struct iov_iter save = msg->msg_iter; |
0abd8ff2 JPM |
697 | uint mtu; |
698 | int rc; | |
699 | ||
700 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
701 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
702 | msg_set_destport(mhdr, 0); | |
703 | msg_set_destnode(mhdr, 0); | |
704 | msg_set_nametype(mhdr, seq->type); | |
705 | msg_set_namelower(mhdr, seq->lower); | |
706 | msg_set_nameupper(mhdr, seq->upper); | |
707 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
708 | ||
f214fc40 PB |
709 | skb_queue_head_init(&pktchain); |
710 | ||
0abd8ff2 | 711 | new_mtu: |
959e1781 | 712 | mtu = tipc_bcast_get_mtu(net); |
f214fc40 | 713 | rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, &pktchain); |
0abd8ff2 JPM |
714 | if (unlikely(rc < 0)) |
715 | return rc; | |
716 | ||
717 | do { | |
f214fc40 | 718 | rc = tipc_bcast_xmit(net, &pktchain); |
22d85c79 JPM |
719 | if (likely(!rc)) |
720 | return dsz; | |
721 | ||
722 | if (rc == -ELINKCONG) { | |
723 | tsk->link_cong = 1; | |
724 | rc = tipc_wait_for_sndmsg(sock, &timeo); | |
725 | if (!rc) | |
726 | continue; | |
0abd8ff2 | 727 | } |
f214fc40 | 728 | __skb_queue_purge(&pktchain); |
f25dcc76 AV |
729 | if (rc == -EMSGSIZE) { |
730 | msg->msg_iter = save; | |
0abd8ff2 | 731 | goto new_mtu; |
f25dcc76 | 732 | } |
22d85c79 JPM |
733 | break; |
734 | } while (1); | |
0abd8ff2 JPM |
735 | return rc; |
736 | } | |
737 | ||
cb1b7280 JPM |
738 | /** |
739 | * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets | |
740 | * @arrvq: queue with arriving messages, to be cloned after destination lookup | |
741 | * @inputq: queue with cloned messages, delivered to socket after dest lookup | |
742 | * | |
743 | * Multi-threaded: parallel calls with reference to same queues may occur | |
078bec82 | 744 | */ |
cb1b7280 JPM |
745 | void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, |
746 | struct sk_buff_head *inputq) | |
078bec82 | 747 | { |
cb1b7280 | 748 | struct tipc_msg *msg; |
3c724acd | 749 | struct tipc_plist dports; |
3c724acd | 750 | u32 portid; |
078bec82 | 751 | u32 scope = TIPC_CLUSTER_SCOPE; |
cb1b7280 JPM |
752 | struct sk_buff_head tmpq; |
753 | uint hsz; | |
754 | struct sk_buff *skb, *_skb; | |
3c724acd | 755 | |
cb1b7280 | 756 | __skb_queue_head_init(&tmpq); |
3c724acd | 757 | tipc_plist_init(&dports); |
078bec82 | 758 | |
cb1b7280 JPM |
759 | skb = tipc_skb_peek(arrvq, &inputq->lock); |
760 | for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { | |
761 | msg = buf_msg(skb); | |
762 | hsz = skb_headroom(skb) + msg_hdr_sz(msg); | |
763 | ||
764 | if (in_own_node(net, msg_orignode(msg))) | |
765 | scope = TIPC_NODE_SCOPE; | |
766 | ||
767 | /* Create destination port list and message clones: */ | |
768 | tipc_nametbl_mc_translate(net, | |
769 | msg_nametype(msg), msg_namelower(msg), | |
770 | msg_nameupper(msg), scope, &dports); | |
771 | portid = tipc_plist_pop(&dports); | |
772 | for (; portid; portid = tipc_plist_pop(&dports)) { | |
773 | _skb = __pskb_copy(skb, hsz, GFP_ATOMIC); | |
774 | if (_skb) { | |
775 | msg_set_destport(buf_msg(_skb), portid); | |
776 | __skb_queue_tail(&tmpq, _skb); | |
777 | continue; | |
778 | } | |
779 | pr_warn("Failed to clone mcast rcv buffer\n"); | |
078bec82 | 780 | } |
cb1b7280 JPM |
781 | /* Append to inputq if not already done by other thread */ |
782 | spin_lock_bh(&inputq->lock); | |
783 | if (skb_peek(arrvq) == skb) { | |
784 | skb_queue_splice_tail_init(&tmpq, inputq); | |
785 | kfree_skb(__skb_dequeue(arrvq)); | |
786 | } | |
787 | spin_unlock_bh(&inputq->lock); | |
788 | __skb_queue_purge(&tmpq); | |
789 | kfree_skb(skb); | |
078bec82 | 790 | } |
cb1b7280 | 791 | tipc_sk_rcv(net, inputq); |
078bec82 JPM |
792 | } |
793 | ||
ac0074ee JPM |
794 | /** |
795 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
796 | * @tsk: receiving socket | |
bcd3ffd4 | 797 | * @skb: pointer to message buffer. |
ac0074ee | 798 | */ |
bcd3ffd4 | 799 | static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb) |
ac0074ee | 800 | { |
bcd3ffd4 JPM |
801 | struct sock *sk = &tsk->sk; |
802 | struct tipc_msg *hdr = buf_msg(skb); | |
803 | int mtyp = msg_type(hdr); | |
10724cc7 | 804 | bool conn_cong; |
bcd3ffd4 | 805 | |
ac0074ee | 806 | /* Ignore if connection cannot be validated: */ |
bcd3ffd4 | 807 | if (!tsk_peer_msg(tsk, hdr)) |
ac0074ee JPM |
808 | goto exit; |
809 | ||
301bae56 | 810 | tsk->probing_state = TIPC_CONN_OK; |
ac0074ee | 811 | |
bcd3ffd4 JPM |
812 | if (mtyp == CONN_PROBE) { |
813 | msg_set_type(hdr, CONN_PROBE_REPLY); | |
814 | tipc_sk_respond(sk, skb, TIPC_OK); | |
815 | return; | |
816 | } else if (mtyp == CONN_ACK) { | |
301bae56 | 817 | conn_cong = tsk_conn_cong(tsk); |
10724cc7 JPM |
818 | tsk->snt_unacked -= msg_conn_ack(hdr); |
819 | if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) | |
820 | tsk->snd_win = msg_adv_win(hdr); | |
60120526 | 821 | if (conn_cong) |
bcd3ffd4 JPM |
822 | sk->sk_write_space(sk); |
823 | } else if (mtyp != CONN_PROBE_REPLY) { | |
824 | pr_warn("Received unknown CONN_PROTO msg\n"); | |
ac0074ee | 825 | } |
ac0074ee | 826 | exit: |
bcd3ffd4 | 827 | kfree_skb(skb); |
ac0074ee JPM |
828 | } |
829 | ||
3f40504f YX |
830 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
831 | { | |
832 | struct sock *sk = sock->sk; | |
58ed9442 | 833 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
834 | DEFINE_WAIT(wait); |
835 | int done; | |
836 | ||
837 | do { | |
838 | int err = sock_error(sk); | |
839 | if (err) | |
840 | return err; | |
841 | if (sock->state == SS_DISCONNECTING) | |
842 | return -EPIPE; | |
843 | if (!*timeo_p) | |
844 | return -EAGAIN; | |
845 | if (signal_pending(current)) | |
846 | return sock_intr_errno(*timeo_p); | |
847 | ||
848 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 849 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
850 | finish_wait(sk_sleep(sk), &wait); |
851 | } while (!done); | |
852 | return 0; | |
853 | } | |
854 | ||
b97bf3fd | 855 | /** |
247f0f3c | 856 | * tipc_sendmsg - send message in connectionless manner |
b97bf3fd PL |
857 | * @sock: socket structure |
858 | * @m: message to send | |
e2dafe87 | 859 | * @dsz: amount of user data to be sent |
c4307285 | 860 | * |
b97bf3fd | 861 | * Message must have an destination specified explicitly. |
c4307285 | 862 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
863 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
864 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 865 | * |
b97bf3fd PL |
866 | * Returns the number of bytes sent on success, or errno otherwise |
867 | */ | |
1b784140 | 868 | static int tipc_sendmsg(struct socket *sock, |
e2dafe87 | 869 | struct msghdr *m, size_t dsz) |
39a0295f YX |
870 | { |
871 | struct sock *sk = sock->sk; | |
872 | int ret; | |
873 | ||
874 | lock_sock(sk); | |
875 | ret = __tipc_sendmsg(sock, m, dsz); | |
876 | release_sock(sk); | |
877 | ||
878 | return ret; | |
879 | } | |
880 | ||
881 | static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz) | |
b97bf3fd | 882 | { |
e2dafe87 | 883 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 884 | struct sock *sk = sock->sk; |
58ed9442 | 885 | struct tipc_sock *tsk = tipc_sk(sk); |
f2f9800d | 886 | struct net *net = sock_net(sk); |
301bae56 | 887 | struct tipc_msg *mhdr = &tsk->phdr; |
e2dafe87 | 888 | u32 dnode, dport; |
f214fc40 | 889 | struct sk_buff_head pktchain; |
a6ca1094 | 890 | struct sk_buff *skb; |
f2f8036e | 891 | struct tipc_name_seq *seq; |
f25dcc76 | 892 | struct iov_iter save; |
e2dafe87 | 893 | u32 mtu; |
3f40504f | 894 | long timeo; |
88b17b6a | 895 | int rc; |
b97bf3fd | 896 | |
e2dafe87 | 897 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 898 | return -EMSGSIZE; |
f2f8036e EH |
899 | if (unlikely(!dest)) { |
900 | if (tsk->connected && sock->state == SS_READY) | |
901 | dest = &tsk->remote; | |
902 | else | |
903 | return -EDESTADDRREQ; | |
904 | } else if (unlikely(m->msg_namelen < sizeof(*dest)) || | |
905 | dest->family != AF_TIPC) { | |
906 | return -EINVAL; | |
907 | } | |
e2dafe87 | 908 | if (unlikely(sock->state != SS_READY)) { |
39a0295f YX |
909 | if (sock->state == SS_LISTENING) |
910 | return -EPIPE; | |
911 | if (sock->state != SS_UNCONNECTED) | |
912 | return -EISCONN; | |
913 | if (tsk->published) | |
914 | return -EOPNOTSUPP; | |
3388007b | 915 | if (dest->addrtype == TIPC_ADDR_NAME) { |
301bae56 JPM |
916 | tsk->conn_type = dest->addr.name.name.type; |
917 | tsk->conn_instance = dest->addr.name.name.instance; | |
3388007b | 918 | } |
b97bf3fd | 919 | } |
f2f8036e | 920 | seq = &dest->addr.nameseq; |
3f40504f | 921 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
922 | |
923 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
39a0295f | 924 | return tipc_sendmcast(sock, seq, m, dsz, timeo); |
e2dafe87 JPM |
925 | } else if (dest->addrtype == TIPC_ADDR_NAME) { |
926 | u32 type = dest->addr.name.name.type; | |
927 | u32 inst = dest->addr.name.name.instance; | |
928 | u32 domain = dest->addr.name.domain; | |
929 | ||
930 | dnode = domain; | |
931 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
932 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
933 | msg_set_nametype(mhdr, type); | |
934 | msg_set_nameinst(mhdr, inst); | |
935 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
4ac1c8d0 | 936 | dport = tipc_nametbl_translate(net, type, inst, &dnode); |
e2dafe87 JPM |
937 | msg_set_destnode(mhdr, dnode); |
938 | msg_set_destport(mhdr, dport); | |
39a0295f YX |
939 | if (unlikely(!dport && !dnode)) |
940 | return -EHOSTUNREACH; | |
e2dafe87 JPM |
941 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
942 | dnode = dest->addr.id.node; | |
943 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
944 | msg_set_lookup_scope(mhdr, 0); | |
945 | msg_set_destnode(mhdr, dnode); | |
946 | msg_set_destport(mhdr, dest->addr.id.ref); | |
947 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
948 | } | |
949 | ||
f214fc40 | 950 | skb_queue_head_init(&pktchain); |
f25dcc76 | 951 | save = m->msg_iter; |
e2dafe87 | 952 | new_mtu: |
f2f9800d | 953 | mtu = tipc_node_get_mtu(net, dnode, tsk->portid); |
f214fc40 | 954 | rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &pktchain); |
e2dafe87 | 955 | if (rc < 0) |
39a0295f | 956 | return rc; |
e2dafe87 JPM |
957 | |
958 | do { | |
f214fc40 | 959 | skb = skb_peek(&pktchain); |
a6ca1094 | 960 | TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong; |
f214fc40 | 961 | rc = tipc_node_xmit(net, &pktchain, dnode, tsk->portid); |
22d85c79 | 962 | if (likely(!rc)) { |
e2dafe87 | 963 | if (sock->state != SS_READY) |
0c3141e9 | 964 | sock->state = SS_CONNECTING; |
22d85c79 | 965 | return dsz; |
c4307285 | 966 | } |
22d85c79 JPM |
967 | if (rc == -ELINKCONG) { |
968 | tsk->link_cong = 1; | |
969 | rc = tipc_wait_for_sndmsg(sock, &timeo); | |
970 | if (!rc) | |
971 | continue; | |
972 | } | |
f214fc40 | 973 | __skb_queue_purge(&pktchain); |
f25dcc76 AV |
974 | if (rc == -EMSGSIZE) { |
975 | m->msg_iter = save; | |
e2dafe87 | 976 | goto new_mtu; |
f25dcc76 | 977 | } |
22d85c79 JPM |
978 | break; |
979 | } while (1); | |
e2dafe87 JPM |
980 | |
981 | return rc; | |
b97bf3fd PL |
982 | } |
983 | ||
391a6dd1 YX |
984 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
985 | { | |
986 | struct sock *sk = sock->sk; | |
58ed9442 | 987 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
988 | DEFINE_WAIT(wait); |
989 | int done; | |
990 | ||
991 | do { | |
992 | int err = sock_error(sk); | |
993 | if (err) | |
994 | return err; | |
995 | if (sock->state == SS_DISCONNECTING) | |
996 | return -EPIPE; | |
997 | else if (sock->state != SS_CONNECTED) | |
998 | return -ENOTCONN; | |
999 | if (!*timeo_p) | |
1000 | return -EAGAIN; | |
1001 | if (signal_pending(current)) | |
1002 | return sock_intr_errno(*timeo_p); | |
1003 | ||
1004 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1005 | done = sk_wait_event(sk, timeo_p, | |
60120526 | 1006 | (!tsk->link_cong && |
301bae56 JPM |
1007 | !tsk_conn_cong(tsk)) || |
1008 | !tsk->connected); | |
391a6dd1 YX |
1009 | finish_wait(sk_sleep(sk), &wait); |
1010 | } while (!done); | |
1011 | return 0; | |
1012 | } | |
1013 | ||
c4307285 | 1014 | /** |
4ccfe5e0 | 1015 | * tipc_send_stream - send stream-oriented data |
b97bf3fd | 1016 | * @sock: socket structure |
4ccfe5e0 JPM |
1017 | * @m: data to send |
1018 | * @dsz: total length of data to be transmitted | |
c4307285 | 1019 | * |
4ccfe5e0 | 1020 | * Used for SOCK_STREAM data. |
c4307285 | 1021 | * |
4ccfe5e0 JPM |
1022 | * Returns the number of bytes sent on success (or partial success), |
1023 | * or errno if no data sent | |
b97bf3fd | 1024 | */ |
1b784140 | 1025 | static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz) |
39a0295f YX |
1026 | { |
1027 | struct sock *sk = sock->sk; | |
1028 | int ret; | |
1029 | ||
1030 | lock_sock(sk); | |
1031 | ret = __tipc_send_stream(sock, m, dsz); | |
1032 | release_sock(sk); | |
1033 | ||
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz) | |
b97bf3fd | 1038 | { |
0c3141e9 | 1039 | struct sock *sk = sock->sk; |
f2f9800d | 1040 | struct net *net = sock_net(sk); |
58ed9442 | 1041 | struct tipc_sock *tsk = tipc_sk(sk); |
301bae56 | 1042 | struct tipc_msg *mhdr = &tsk->phdr; |
f214fc40 | 1043 | struct sk_buff_head pktchain; |
342dfc30 | 1044 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
07f6c4bc | 1045 | u32 portid = tsk->portid; |
4ccfe5e0 | 1046 | int rc = -EINVAL; |
391a6dd1 | 1047 | long timeo; |
4ccfe5e0 JPM |
1048 | u32 dnode; |
1049 | uint mtu, send, sent = 0; | |
f25dcc76 | 1050 | struct iov_iter save; |
10724cc7 | 1051 | int hlen = MIN_H_SIZE; |
b97bf3fd PL |
1052 | |
1053 | /* Handle implied connection establishment */ | |
4ccfe5e0 | 1054 | if (unlikely(dest)) { |
39a0295f | 1055 | rc = __tipc_sendmsg(sock, m, dsz); |
10724cc7 | 1056 | hlen = msg_hdr_sz(mhdr); |
4ccfe5e0 | 1057 | if (dsz && (dsz == rc)) |
10724cc7 | 1058 | tsk->snt_unacked = tsk_inc(tsk, dsz + hlen); |
4ccfe5e0 JPM |
1059 | return rc; |
1060 | } | |
1061 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
1062 | return -EMSGSIZE; |
1063 | ||
391a6dd1 YX |
1064 | if (unlikely(sock->state != SS_CONNECTED)) { |
1065 | if (sock->state == SS_DISCONNECTING) | |
39a0295f | 1066 | return -EPIPE; |
391a6dd1 | 1067 | else |
39a0295f | 1068 | return -ENOTCONN; |
391a6dd1 | 1069 | } |
1d835874 | 1070 | |
391a6dd1 | 1071 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
301bae56 | 1072 | dnode = tsk_peer_node(tsk); |
f214fc40 | 1073 | skb_queue_head_init(&pktchain); |
4ccfe5e0 JPM |
1074 | |
1075 | next: | |
f25dcc76 | 1076 | save = m->msg_iter; |
301bae56 | 1077 | mtu = tsk->max_pkt; |
4ccfe5e0 | 1078 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); |
f214fc40 | 1079 | rc = tipc_msg_build(mhdr, m, sent, send, mtu, &pktchain); |
4ccfe5e0 | 1080 | if (unlikely(rc < 0)) |
39a0295f | 1081 | return rc; |
f214fc40 | 1082 | |
c4307285 | 1083 | do { |
301bae56 | 1084 | if (likely(!tsk_conn_cong(tsk))) { |
f214fc40 | 1085 | rc = tipc_node_xmit(net, &pktchain, dnode, portid); |
4ccfe5e0 | 1086 | if (likely(!rc)) { |
10724cc7 | 1087 | tsk->snt_unacked += tsk_inc(tsk, send + hlen); |
4ccfe5e0 JPM |
1088 | sent += send; |
1089 | if (sent == dsz) | |
22d85c79 | 1090 | return dsz; |
4ccfe5e0 JPM |
1091 | goto next; |
1092 | } | |
1093 | if (rc == -EMSGSIZE) { | |
f214fc40 | 1094 | __skb_queue_purge(&pktchain); |
f2f9800d YX |
1095 | tsk->max_pkt = tipc_node_get_mtu(net, dnode, |
1096 | portid); | |
f25dcc76 | 1097 | m->msg_iter = save; |
4ccfe5e0 JPM |
1098 | goto next; |
1099 | } | |
1100 | if (rc != -ELINKCONG) | |
1101 | break; | |
22d85c79 | 1102 | |
50100a5e | 1103 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
1104 | } |
1105 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
1106 | } while (!rc); | |
39a0295f | 1107 | |
f214fc40 | 1108 | __skb_queue_purge(&pktchain); |
4ccfe5e0 | 1109 | return sent ? sent : rc; |
b97bf3fd PL |
1110 | } |
1111 | ||
c4307285 | 1112 | /** |
4ccfe5e0 | 1113 | * tipc_send_packet - send a connection-oriented message |
b97bf3fd | 1114 | * @sock: socket structure |
4ccfe5e0 JPM |
1115 | * @m: message to send |
1116 | * @dsz: length of data to be transmitted | |
c4307285 | 1117 | * |
4ccfe5e0 | 1118 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 1119 | * |
4ccfe5e0 | 1120 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 1121 | */ |
1b784140 | 1122 | static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz) |
b97bf3fd | 1123 | { |
4ccfe5e0 JPM |
1124 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
1125 | return -EMSGSIZE; | |
b97bf3fd | 1126 | |
1b784140 | 1127 | return tipc_send_stream(sock, m, dsz); |
b97bf3fd PL |
1128 | } |
1129 | ||
dadebc00 | 1130 | /* tipc_sk_finish_conn - complete the setup of a connection |
b97bf3fd | 1131 | */ |
301bae56 | 1132 | static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, |
dadebc00 | 1133 | u32 peer_node) |
b97bf3fd | 1134 | { |
3721e9c7 YX |
1135 | struct sock *sk = &tsk->sk; |
1136 | struct net *net = sock_net(sk); | |
301bae56 | 1137 | struct tipc_msg *msg = &tsk->phdr; |
b97bf3fd | 1138 | |
dadebc00 JPM |
1139 | msg_set_destnode(msg, peer_node); |
1140 | msg_set_destport(msg, peer_port); | |
1141 | msg_set_type(msg, TIPC_CONN_MSG); | |
1142 | msg_set_lookup_scope(msg, 0); | |
1143 | msg_set_hdr_sz(msg, SHORT_H_SIZE); | |
584d24b3 | 1144 | |
2f55c437 | 1145 | tsk->probing_intv = CONN_PROBING_INTERVAL; |
301bae56 JPM |
1146 | tsk->probing_state = TIPC_CONN_OK; |
1147 | tsk->connected = 1; | |
3721e9c7 | 1148 | sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv); |
f2f9800d YX |
1149 | tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); |
1150 | tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid); | |
60020e18 | 1151 | tsk->peer_caps = tipc_node_get_capabilities(net, peer_node); |
10724cc7 JPM |
1152 | if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) |
1153 | return; | |
1154 | ||
1155 | /* Fall back to message based flow control */ | |
1156 | tsk->rcv_win = FLOWCTL_MSG_WIN; | |
1157 | tsk->snd_win = FLOWCTL_MSG_WIN; | |
b97bf3fd PL |
1158 | } |
1159 | ||
1160 | /** | |
1161 | * set_orig_addr - capture sender's address for received message | |
1162 | * @m: descriptor for message info | |
1163 | * @msg: received message header | |
c4307285 | 1164 | * |
b97bf3fd PL |
1165 | * Note: Address is not captured if not requested by receiver. |
1166 | */ | |
05790c64 | 1167 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1168 | { |
342dfc30 | 1169 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1170 | |
c4307285 | 1171 | if (addr) { |
b97bf3fd PL |
1172 | addr->family = AF_TIPC; |
1173 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1174 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1175 | addr->addr.id.ref = msg_origport(msg); |
1176 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1177 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1178 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1179 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1180 | } | |
1181 | } | |
1182 | ||
1183 | /** | |
301bae56 | 1184 | * tipc_sk_anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1185 | * @m: descriptor for message info |
1186 | * @msg: received message header | |
301bae56 | 1187 | * @tsk: TIPC port associated with message |
c4307285 | 1188 | * |
b97bf3fd | 1189 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1190 | * |
b97bf3fd PL |
1191 | * Returns 0 if successful, otherwise errno |
1192 | */ | |
301bae56 JPM |
1193 | static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
1194 | struct tipc_sock *tsk) | |
b97bf3fd PL |
1195 | { |
1196 | u32 anc_data[3]; | |
1197 | u32 err; | |
1198 | u32 dest_type; | |
3546c750 | 1199 | int has_name; |
b97bf3fd PL |
1200 | int res; |
1201 | ||
1202 | if (likely(m->msg_controllen == 0)) | |
1203 | return 0; | |
1204 | ||
1205 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1206 | err = msg ? msg_errcode(msg) : 0; |
1207 | if (unlikely(err)) { | |
1208 | anc_data[0] = err; | |
1209 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1210 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1211 | if (res) | |
b97bf3fd | 1212 | return res; |
2db9983a AS |
1213 | if (anc_data[1]) { |
1214 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1215 | msg_data(msg)); | |
1216 | if (res) | |
1217 | return res; | |
1218 | } | |
b97bf3fd PL |
1219 | } |
1220 | ||
1221 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1222 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1223 | switch (dest_type) { | |
1224 | case TIPC_NAMED_MSG: | |
3546c750 | 1225 | has_name = 1; |
b97bf3fd PL |
1226 | anc_data[0] = msg_nametype(msg); |
1227 | anc_data[1] = msg_namelower(msg); | |
1228 | anc_data[2] = msg_namelower(msg); | |
1229 | break; | |
1230 | case TIPC_MCAST_MSG: | |
3546c750 | 1231 | has_name = 1; |
b97bf3fd PL |
1232 | anc_data[0] = msg_nametype(msg); |
1233 | anc_data[1] = msg_namelower(msg); | |
1234 | anc_data[2] = msg_nameupper(msg); | |
1235 | break; | |
1236 | case TIPC_CONN_MSG: | |
301bae56 JPM |
1237 | has_name = (tsk->conn_type != 0); |
1238 | anc_data[0] = tsk->conn_type; | |
1239 | anc_data[1] = tsk->conn_instance; | |
1240 | anc_data[2] = tsk->conn_instance; | |
b97bf3fd PL |
1241 | break; |
1242 | default: | |
3546c750 | 1243 | has_name = 0; |
b97bf3fd | 1244 | } |
2db9983a AS |
1245 | if (has_name) { |
1246 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1247 | if (res) | |
1248 | return res; | |
1249 | } | |
b97bf3fd PL |
1250 | |
1251 | return 0; | |
1252 | } | |
1253 | ||
10724cc7 | 1254 | static void tipc_sk_send_ack(struct tipc_sock *tsk) |
739f5e4e | 1255 | { |
f2f9800d | 1256 | struct net *net = sock_net(&tsk->sk); |
a6ca1094 | 1257 | struct sk_buff *skb = NULL; |
739f5e4e | 1258 | struct tipc_msg *msg; |
301bae56 JPM |
1259 | u32 peer_port = tsk_peer_port(tsk); |
1260 | u32 dnode = tsk_peer_node(tsk); | |
739f5e4e | 1261 | |
301bae56 | 1262 | if (!tsk->connected) |
739f5e4e | 1263 | return; |
c5898636 JPM |
1264 | skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, |
1265 | dnode, tsk_own_node(tsk), peer_port, | |
1266 | tsk->portid, TIPC_OK); | |
a6ca1094 | 1267 | if (!skb) |
739f5e4e | 1268 | return; |
a6ca1094 | 1269 | msg = buf_msg(skb); |
10724cc7 JPM |
1270 | msg_set_conn_ack(msg, tsk->rcv_unacked); |
1271 | tsk->rcv_unacked = 0; | |
1272 | ||
1273 | /* Adjust to and advertize the correct window limit */ | |
1274 | if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) { | |
1275 | tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf); | |
1276 | msg_set_adv_win(msg, tsk->rcv_win); | |
1277 | } | |
af9b028e | 1278 | tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg)); |
739f5e4e JPM |
1279 | } |
1280 | ||
85d3fc94 | 1281 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1282 | { |
1283 | struct sock *sk = sock->sk; | |
1284 | DEFINE_WAIT(wait); | |
85d3fc94 | 1285 | long timeo = *timeop; |
9bbb4ecc YX |
1286 | int err; |
1287 | ||
1288 | for (;;) { | |
1289 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1290 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1291 | if (sock->state == SS_DISCONNECTING) { |
1292 | err = -ENOTCONN; | |
1293 | break; | |
1294 | } | |
1295 | release_sock(sk); | |
1296 | timeo = schedule_timeout(timeo); | |
1297 | lock_sock(sk); | |
1298 | } | |
1299 | err = 0; | |
1300 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1301 | break; | |
9bbb4ecc YX |
1302 | err = -EAGAIN; |
1303 | if (!timeo) | |
1304 | break; | |
143fe22f EH |
1305 | err = sock_intr_errno(timeo); |
1306 | if (signal_pending(current)) | |
1307 | break; | |
9bbb4ecc YX |
1308 | } |
1309 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1310 | *timeop = timeo; |
9bbb4ecc YX |
1311 | return err; |
1312 | } | |
1313 | ||
c4307285 | 1314 | /** |
247f0f3c | 1315 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1316 | * @m: descriptor for message info |
1317 | * @buf_len: total size of user buffer area | |
1318 | * @flags: receive flags | |
c4307285 | 1319 | * |
b97bf3fd PL |
1320 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1321 | * If the complete message doesn't fit in user area, truncate it. | |
1322 | * | |
1323 | * Returns size of returned message data, errno otherwise | |
1324 | */ | |
1b784140 YX |
1325 | static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len, |
1326 | int flags) | |
b97bf3fd | 1327 | { |
0c3141e9 | 1328 | struct sock *sk = sock->sk; |
58ed9442 | 1329 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1330 | struct sk_buff *buf; |
1331 | struct tipc_msg *msg; | |
9bbb4ecc | 1332 | long timeo; |
b97bf3fd PL |
1333 | unsigned int sz; |
1334 | u32 err; | |
10724cc7 | 1335 | int res, hlen; |
b97bf3fd | 1336 | |
0c3141e9 | 1337 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1338 | if (unlikely(!buf_len)) |
1339 | return -EINVAL; | |
1340 | ||
0c3141e9 | 1341 | lock_sock(sk); |
b97bf3fd | 1342 | |
0c3141e9 AS |
1343 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1344 | res = -ENOTCONN; | |
b97bf3fd PL |
1345 | goto exit; |
1346 | } | |
1347 | ||
9bbb4ecc | 1348 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1349 | restart: |
b97bf3fd | 1350 | |
0c3141e9 | 1351 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1352 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1353 | if (res) |
1354 | goto exit; | |
b97bf3fd | 1355 | |
0c3141e9 | 1356 | /* Look at first message in receive queue */ |
0c3141e9 | 1357 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1358 | msg = buf_msg(buf); |
1359 | sz = msg_data_sz(msg); | |
10724cc7 | 1360 | hlen = msg_hdr_sz(msg); |
b97bf3fd PL |
1361 | err = msg_errcode(msg); |
1362 | ||
b97bf3fd | 1363 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1364 | if ((!sz) && (!err)) { |
2e84c60b | 1365 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1366 | goto restart; |
1367 | } | |
1368 | ||
1369 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1370 | set_orig_addr(m, msg); |
1371 | ||
1372 | /* Capture ancillary data (optional) */ | |
301bae56 | 1373 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1374 | if (res) |
b97bf3fd PL |
1375 | goto exit; |
1376 | ||
1377 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1378 | if (!err) { |
1379 | if (unlikely(buf_len < sz)) { | |
1380 | sz = buf_len; | |
1381 | m->msg_flags |= MSG_TRUNC; | |
1382 | } | |
10724cc7 | 1383 | res = skb_copy_datagram_msg(buf, hlen, m, sz); |
0232fd0a | 1384 | if (res) |
b97bf3fd | 1385 | goto exit; |
b97bf3fd PL |
1386 | res = sz; |
1387 | } else { | |
1388 | if ((sock->state == SS_READY) || | |
1389 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1390 | res = 0; | |
1391 | else | |
1392 | res = -ECONNRESET; | |
1393 | } | |
1394 | ||
10724cc7 JPM |
1395 | if (unlikely(flags & MSG_PEEK)) |
1396 | goto exit; | |
1397 | ||
1398 | if (likely(sock->state != SS_READY)) { | |
1399 | tsk->rcv_unacked += tsk_inc(tsk, hlen + sz); | |
1400 | if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4))) | |
1401 | tipc_sk_send_ack(tsk); | |
c4307285 | 1402 | } |
10724cc7 | 1403 | tsk_advance_rx_queue(sk); |
b97bf3fd | 1404 | exit: |
0c3141e9 | 1405 | release_sock(sk); |
b97bf3fd PL |
1406 | return res; |
1407 | } | |
1408 | ||
c4307285 | 1409 | /** |
247f0f3c | 1410 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1411 | * @m: descriptor for message info |
1412 | * @buf_len: total size of user buffer area | |
1413 | * @flags: receive flags | |
c4307285 YH |
1414 | * |
1415 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1416 | * will optionally wait for more; never truncates data. |
1417 | * | |
1418 | * Returns size of returned message data, errno otherwise | |
1419 | */ | |
1b784140 YX |
1420 | static int tipc_recv_stream(struct socket *sock, struct msghdr *m, |
1421 | size_t buf_len, int flags) | |
b97bf3fd | 1422 | { |
0c3141e9 | 1423 | struct sock *sk = sock->sk; |
58ed9442 | 1424 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1425 | struct sk_buff *buf; |
1426 | struct tipc_msg *msg; | |
9bbb4ecc | 1427 | long timeo; |
b97bf3fd | 1428 | unsigned int sz; |
3720d40b | 1429 | int sz_to_copy, target, needed; |
b97bf3fd | 1430 | int sz_copied = 0; |
b97bf3fd | 1431 | u32 err; |
10724cc7 | 1432 | int res = 0, hlen; |
b97bf3fd | 1433 | |
0c3141e9 | 1434 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1435 | if (unlikely(!buf_len)) |
1436 | return -EINVAL; | |
1437 | ||
0c3141e9 | 1438 | lock_sock(sk); |
b97bf3fd | 1439 | |
9bbb4ecc | 1440 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1441 | res = -ENOTCONN; |
b97bf3fd PL |
1442 | goto exit; |
1443 | } | |
1444 | ||
3720d40b | 1445 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1446 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1447 | |
617d3c7a | 1448 | restart: |
0c3141e9 | 1449 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1450 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1451 | if (res) |
1452 | goto exit; | |
b97bf3fd | 1453 | |
0c3141e9 | 1454 | /* Look at first message in receive queue */ |
0c3141e9 | 1455 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1456 | msg = buf_msg(buf); |
1457 | sz = msg_data_sz(msg); | |
10724cc7 | 1458 | hlen = msg_hdr_sz(msg); |
b97bf3fd PL |
1459 | err = msg_errcode(msg); |
1460 | ||
1461 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1462 | if ((!sz) && (!err)) { |
2e84c60b | 1463 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1464 | goto restart; |
1465 | } | |
1466 | ||
1467 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1468 | if (sz_copied == 0) { |
1469 | set_orig_addr(m, msg); | |
301bae56 | 1470 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1471 | if (res) |
b97bf3fd PL |
1472 | goto exit; |
1473 | } | |
1474 | ||
1475 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1476 | if (!err) { |
0232fd0a | 1477 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1478 | |
0232fd0a | 1479 | sz -= offset; |
b97bf3fd PL |
1480 | needed = (buf_len - sz_copied); |
1481 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a | 1482 | |
10724cc7 | 1483 | res = skb_copy_datagram_msg(buf, hlen + offset, m, sz_to_copy); |
0232fd0a | 1484 | if (res) |
b97bf3fd | 1485 | goto exit; |
0232fd0a | 1486 | |
b97bf3fd PL |
1487 | sz_copied += sz_to_copy; |
1488 | ||
1489 | if (sz_to_copy < sz) { | |
1490 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1491 | TIPC_SKB_CB(buf)->handle = |
1492 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1493 | goto exit; |
1494 | } | |
b97bf3fd PL |
1495 | } else { |
1496 | if (sz_copied != 0) | |
1497 | goto exit; /* can't add error msg to valid data */ | |
1498 | ||
1499 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1500 | res = 0; | |
1501 | else | |
1502 | res = -ECONNRESET; | |
1503 | } | |
1504 | ||
10724cc7 JPM |
1505 | if (unlikely(flags & MSG_PEEK)) |
1506 | goto exit; | |
1507 | ||
1508 | tsk->rcv_unacked += tsk_inc(tsk, hlen + sz); | |
1509 | if (unlikely(tsk->rcv_unacked >= (tsk->rcv_win / 4))) | |
1510 | tipc_sk_send_ack(tsk); | |
1511 | tsk_advance_rx_queue(sk); | |
b97bf3fd PL |
1512 | |
1513 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1514 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1515 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1516 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 | 1517 | (!err)) /* and haven't reached a FIN */ |
b97bf3fd PL |
1518 | goto restart; |
1519 | ||
1520 | exit: | |
0c3141e9 | 1521 | release_sock(sk); |
a3b0a5a9 | 1522 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1523 | } |
1524 | ||
f288bef4 YX |
1525 | /** |
1526 | * tipc_write_space - wake up thread if port congestion is released | |
1527 | * @sk: socket | |
1528 | */ | |
1529 | static void tipc_write_space(struct sock *sk) | |
1530 | { | |
1531 | struct socket_wq *wq; | |
1532 | ||
1533 | rcu_read_lock(); | |
1534 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 1535 | if (skwq_has_sleeper(wq)) |
f288bef4 YX |
1536 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
1537 | POLLWRNORM | POLLWRBAND); | |
1538 | rcu_read_unlock(); | |
1539 | } | |
1540 | ||
1541 | /** | |
1542 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1543 | * @sk: socket | |
1544 | * @len: the length of messages | |
1545 | */ | |
676d2369 | 1546 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1547 | { |
1548 | struct socket_wq *wq; | |
1549 | ||
1550 | rcu_read_lock(); | |
1551 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 1552 | if (skwq_has_sleeper(wq)) |
f288bef4 YX |
1553 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | |
1554 | POLLRDNORM | POLLRDBAND); | |
1555 | rcu_read_unlock(); | |
1556 | } | |
1557 | ||
f4195d1e YX |
1558 | static void tipc_sock_destruct(struct sock *sk) |
1559 | { | |
1560 | __skb_queue_purge(&sk->sk_receive_queue); | |
1561 | } | |
1562 | ||
7e6c131e YX |
1563 | /** |
1564 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1565 | * @tsk: TIPC socket |
1186adf7 | 1566 | * @skb: pointer to message buffer. Set to NULL if buffer is consumed |
7e6c131e | 1567 | * |
cda3696d | 1568 | * Returns true if everything ok, false otherwise |
7e6c131e | 1569 | */ |
cda3696d | 1570 | static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb) |
7e6c131e | 1571 | { |
58ed9442 | 1572 | struct sock *sk = &tsk->sk; |
f2f9800d | 1573 | struct net *net = sock_net(sk); |
8826cde6 | 1574 | struct socket *sock = sk->sk_socket; |
cda3696d | 1575 | struct tipc_msg *hdr = buf_msg(skb); |
7e6c131e | 1576 | |
cda3696d JPM |
1577 | if (unlikely(msg_mcast(hdr))) |
1578 | return false; | |
7e6c131e YX |
1579 | |
1580 | switch ((int)sock->state) { | |
1581 | case SS_CONNECTED: | |
cda3696d | 1582 | |
7e6c131e | 1583 | /* Accept only connection-based messages sent by peer */ |
cda3696d JPM |
1584 | if (unlikely(!tsk_peer_msg(tsk, hdr))) |
1585 | return false; | |
1586 | ||
1587 | if (unlikely(msg_errcode(hdr))) { | |
1588 | sock->state = SS_DISCONNECTING; | |
1589 | tsk->connected = 0; | |
1590 | /* Let timer expire on it's own */ | |
1591 | tipc_node_remove_conn(net, tsk_peer_node(tsk), | |
1592 | tsk->portid); | |
7e6c131e | 1593 | } |
cda3696d JPM |
1594 | return true; |
1595 | ||
7e6c131e | 1596 | case SS_CONNECTING: |
dadebc00 | 1597 | |
cda3696d JPM |
1598 | /* Accept only ACK or NACK message */ |
1599 | if (unlikely(!msg_connected(hdr))) | |
1600 | return false; | |
dadebc00 | 1601 | |
cda3696d | 1602 | if (unlikely(msg_errcode(hdr))) { |
584d24b3 | 1603 | sock->state = SS_DISCONNECTING; |
2c8d8518 | 1604 | sk->sk_err = ECONNREFUSED; |
cda3696d | 1605 | return true; |
584d24b3 YX |
1606 | } |
1607 | ||
cda3696d | 1608 | if (unlikely(!msg_isdata(hdr))) { |
584d24b3 | 1609 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1610 | sk->sk_err = EINVAL; |
cda3696d | 1611 | return true; |
584d24b3 YX |
1612 | } |
1613 | ||
cda3696d JPM |
1614 | tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr)); |
1615 | msg_set_importance(&tsk->phdr, msg_importance(hdr)); | |
dadebc00 JPM |
1616 | sock->state = SS_CONNECTED; |
1617 | ||
cda3696d JPM |
1618 | /* If 'ACK+' message, add to socket receive queue */ |
1619 | if (msg_data_sz(hdr)) | |
1620 | return true; | |
1621 | ||
1622 | /* If empty 'ACK-' message, wake up sleeping connect() */ | |
1623 | if (waitqueue_active(sk_sleep(sk))) | |
1624 | wake_up_interruptible(sk_sleep(sk)); | |
1625 | ||
1626 | /* 'ACK-' message is neither accepted nor rejected: */ | |
1627 | msg_set_dest_droppable(hdr, 1); | |
1628 | return false; | |
1629 | ||
7e6c131e YX |
1630 | case SS_LISTENING: |
1631 | case SS_UNCONNECTED: | |
cda3696d | 1632 | |
7e6c131e | 1633 | /* Accept only SYN message */ |
cda3696d JPM |
1634 | if (!msg_connected(hdr) && !(msg_errcode(hdr))) |
1635 | return true; | |
7e6c131e YX |
1636 | break; |
1637 | case SS_DISCONNECTING: | |
1638 | break; | |
1639 | default: | |
1640 | pr_err("Unknown socket state %u\n", sock->state); | |
1641 | } | |
cda3696d | 1642 | return false; |
7e6c131e YX |
1643 | } |
1644 | ||
aba79f33 YX |
1645 | /** |
1646 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1647 | * @sk: socket | |
10724cc7 | 1648 | * @skb: message |
aba79f33 | 1649 | * |
10724cc7 JPM |
1650 | * For connection oriented messages, irrespective of importance, |
1651 | * default queue limit is 2 MB. | |
aba79f33 | 1652 | * |
10724cc7 JPM |
1653 | * For connectionless messages, queue limits are based on message |
1654 | * importance as follows: | |
aba79f33 | 1655 | * |
10724cc7 JPM |
1656 | * TIPC_LOW_IMPORTANCE (2 MB) |
1657 | * TIPC_MEDIUM_IMPORTANCE (4 MB) | |
1658 | * TIPC_HIGH_IMPORTANCE (8 MB) | |
1659 | * TIPC_CRITICAL_IMPORTANCE (16 MB) | |
aba79f33 YX |
1660 | * |
1661 | * Returns overload limit according to corresponding message importance | |
1662 | */ | |
10724cc7 | 1663 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb) |
aba79f33 | 1664 | { |
10724cc7 JPM |
1665 | struct tipc_sock *tsk = tipc_sk(sk); |
1666 | struct tipc_msg *hdr = buf_msg(skb); | |
1667 | ||
1668 | if (unlikely(!msg_connected(hdr))) | |
1669 | return sk->sk_rcvbuf << msg_importance(hdr); | |
aba79f33 | 1670 | |
10724cc7 JPM |
1671 | if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL)) |
1672 | return sk->sk_rcvbuf; | |
0cee6bbe | 1673 | |
10724cc7 | 1674 | return FLOWCTL_MSG_LIM; |
aba79f33 YX |
1675 | } |
1676 | ||
c4307285 | 1677 | /** |
0c3141e9 AS |
1678 | * filter_rcv - validate incoming message |
1679 | * @sk: socket | |
cda3696d | 1680 | * @skb: pointer to message. |
c4307285 | 1681 | * |
0c3141e9 AS |
1682 | * Enqueues message on receive queue if acceptable; optionally handles |
1683 | * disconnect indication for a connected socket. | |
1684 | * | |
1186adf7 | 1685 | * Called with socket lock already taken |
c4307285 | 1686 | * |
cda3696d | 1687 | * Returns true if message was added to socket receive queue, otherwise false |
b97bf3fd | 1688 | */ |
cda3696d | 1689 | static bool filter_rcv(struct sock *sk, struct sk_buff *skb) |
b97bf3fd | 1690 | { |
0c3141e9 | 1691 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1692 | struct tipc_sock *tsk = tipc_sk(sk); |
cda3696d JPM |
1693 | struct tipc_msg *hdr = buf_msg(skb); |
1694 | unsigned int limit = rcvbuf_limit(sk, skb); | |
1695 | int err = TIPC_OK; | |
1696 | int usr = msg_user(hdr); | |
b97bf3fd | 1697 | |
cda3696d JPM |
1698 | if (unlikely(msg_user(hdr) == CONN_MANAGER)) { |
1699 | tipc_sk_proto_rcv(tsk, skb); | |
1700 | return false; | |
1186adf7 | 1701 | } |
ec8a2e56 | 1702 | |
cda3696d JPM |
1703 | if (unlikely(usr == SOCK_WAKEUP)) { |
1704 | kfree_skb(skb); | |
50100a5e JPM |
1705 | tsk->link_cong = 0; |
1706 | sk->sk_write_space(sk); | |
cda3696d | 1707 | return false; |
50100a5e JPM |
1708 | } |
1709 | ||
cda3696d JPM |
1710 | /* Drop if illegal message type */ |
1711 | if (unlikely(msg_type(hdr) > TIPC_DIRECT_MSG)) { | |
1712 | kfree_skb(skb); | |
1713 | return false; | |
1714 | } | |
0c3141e9 | 1715 | |
cda3696d JPM |
1716 | /* Reject if wrong message type for current socket state */ |
1717 | if (unlikely(sock->state == SS_READY)) { | |
1718 | if (msg_connected(hdr)) { | |
1719 | err = TIPC_ERR_NO_PORT; | |
1720 | goto reject; | |
1721 | } | |
1722 | } else if (unlikely(!filter_connect(tsk, skb))) { | |
1723 | err = TIPC_ERR_NO_PORT; | |
1724 | goto reject; | |
b97bf3fd PL |
1725 | } |
1726 | ||
1727 | /* Reject message if there isn't room to queue it */ | |
cda3696d JPM |
1728 | if (unlikely(sk_rmem_alloc_get(sk) + skb->truesize >= limit)) { |
1729 | err = TIPC_ERR_OVERLOAD; | |
1730 | goto reject; | |
1731 | } | |
b97bf3fd | 1732 | |
aba79f33 | 1733 | /* Enqueue message */ |
cda3696d JPM |
1734 | TIPC_SKB_CB(skb)->handle = NULL; |
1735 | __skb_queue_tail(&sk->sk_receive_queue, skb); | |
1736 | skb_set_owner_r(skb, sk); | |
0c3141e9 | 1737 | |
676d2369 | 1738 | sk->sk_data_ready(sk); |
cda3696d JPM |
1739 | return true; |
1740 | ||
1741 | reject: | |
1742 | tipc_sk_respond(sk, skb, err); | |
1743 | return false; | |
0c3141e9 | 1744 | } |
b97bf3fd | 1745 | |
0c3141e9 | 1746 | /** |
4f4482dc | 1747 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 | 1748 | * @sk: socket |
a6ca1094 | 1749 | * @skb: message |
0c3141e9 | 1750 | * |
e3a77561 | 1751 | * Caller must hold socket lock |
0c3141e9 AS |
1752 | * |
1753 | * Returns 0 | |
1754 | */ | |
a6ca1094 | 1755 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
0c3141e9 | 1756 | { |
cda3696d | 1757 | unsigned int truesize = skb->truesize; |
0c3141e9 | 1758 | |
cda3696d JPM |
1759 | if (likely(filter_rcv(sk, skb))) |
1760 | atomic_add(truesize, &tipc_sk(sk)->dupl_rcvcnt); | |
0c3141e9 AS |
1761 | return 0; |
1762 | } | |
1763 | ||
d570d864 | 1764 | /** |
c637c103 JPM |
1765 | * tipc_sk_enqueue - extract all buffers with destination 'dport' from |
1766 | * inputq and try adding them to socket or backlog queue | |
1767 | * @inputq: list of incoming buffers with potentially different destinations | |
1768 | * @sk: socket where the buffers should be enqueued | |
1769 | * @dport: port number for the socket | |
d570d864 JPM |
1770 | * |
1771 | * Caller must hold socket lock | |
d570d864 | 1772 | */ |
cda3696d JPM |
1773 | static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, |
1774 | u32 dport) | |
d570d864 JPM |
1775 | { |
1776 | unsigned int lim; | |
1777 | atomic_t *dcnt; | |
c637c103 JPM |
1778 | struct sk_buff *skb; |
1779 | unsigned long time_limit = jiffies + 2; | |
1780 | ||
1781 | while (skb_queue_len(inputq)) { | |
51a00daf | 1782 | if (unlikely(time_after_eq(jiffies, time_limit))) |
cda3696d JPM |
1783 | return; |
1784 | ||
c637c103 JPM |
1785 | skb = tipc_skb_dequeue(inputq, dport); |
1786 | if (unlikely(!skb)) | |
cda3696d JPM |
1787 | return; |
1788 | ||
1789 | /* Add message directly to receive queue if possible */ | |
c637c103 | 1790 | if (!sock_owned_by_user(sk)) { |
cda3696d JPM |
1791 | filter_rcv(sk, skb); |
1792 | continue; | |
c637c103 | 1793 | } |
cda3696d JPM |
1794 | |
1795 | /* Try backlog, compensating for double-counted bytes */ | |
c637c103 | 1796 | dcnt = &tipc_sk(sk)->dupl_rcvcnt; |
7c8bcfb1 | 1797 | if (!sk->sk_backlog.len) |
c637c103 JPM |
1798 | atomic_set(dcnt, 0); |
1799 | lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); | |
1800 | if (likely(!sk_add_backlog(sk, skb, lim))) | |
1801 | continue; | |
cda3696d JPM |
1802 | |
1803 | /* Overload => reject message back to sender */ | |
1804 | tipc_sk_respond(sk, skb, TIPC_ERR_OVERLOAD); | |
1805 | break; | |
c637c103 | 1806 | } |
d570d864 JPM |
1807 | } |
1808 | ||
0c3141e9 | 1809 | /** |
c637c103 JPM |
1810 | * tipc_sk_rcv - handle a chain of incoming buffers |
1811 | * @inputq: buffer list containing the buffers | |
1812 | * Consumes all buffers in list until inputq is empty | |
1813 | * Note: may be called in multiple threads referring to the same queue | |
0c3141e9 | 1814 | */ |
cda3696d | 1815 | void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) |
0c3141e9 | 1816 | { |
c637c103 | 1817 | u32 dnode, dport = 0; |
9871b27f | 1818 | int err; |
9816f061 | 1819 | struct tipc_sock *tsk; |
9816f061 | 1820 | struct sock *sk; |
cda3696d | 1821 | struct sk_buff *skb; |
9816f061 | 1822 | |
c637c103 | 1823 | while (skb_queue_len(inputq)) { |
c637c103 JPM |
1824 | dport = tipc_skb_peek_port(inputq, dport); |
1825 | tsk = tipc_sk_lookup(net, dport); | |
cda3696d | 1826 | |
c637c103 JPM |
1827 | if (likely(tsk)) { |
1828 | sk = &tsk->sk; | |
1829 | if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { | |
cda3696d | 1830 | tipc_sk_enqueue(inputq, sk, dport); |
c637c103 | 1831 | spin_unlock_bh(&sk->sk_lock.slock); |
c637c103 JPM |
1832 | } |
1833 | sock_put(sk); | |
c637c103 | 1834 | continue; |
c637c103 | 1835 | } |
cda3696d JPM |
1836 | |
1837 | /* No destination socket => dequeue skb if still there */ | |
1838 | skb = tipc_skb_dequeue(inputq, dport); | |
1839 | if (!skb) | |
1840 | return; | |
1841 | ||
1842 | /* Try secondary lookup if unresolved named message */ | |
1843 | err = TIPC_ERR_NO_PORT; | |
1844 | if (tipc_msg_lookup_dest(net, skb, &err)) | |
1845 | goto xmit; | |
1846 | ||
1847 | /* Prepare for message rejection */ | |
1848 | if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err)) | |
c637c103 | 1849 | continue; |
e3a77561 | 1850 | xmit: |
cda3696d | 1851 | dnode = msg_destnode(buf_msg(skb)); |
af9b028e | 1852 | tipc_node_xmit_skb(net, skb, dnode, dport); |
c637c103 | 1853 | } |
b97bf3fd PL |
1854 | } |
1855 | ||
78eb3a53 YX |
1856 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1857 | { | |
1858 | struct sock *sk = sock->sk; | |
1859 | DEFINE_WAIT(wait); | |
1860 | int done; | |
1861 | ||
1862 | do { | |
1863 | int err = sock_error(sk); | |
1864 | if (err) | |
1865 | return err; | |
1866 | if (!*timeo_p) | |
1867 | return -ETIMEDOUT; | |
1868 | if (signal_pending(current)) | |
1869 | return sock_intr_errno(*timeo_p); | |
1870 | ||
1871 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1872 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1873 | finish_wait(sk_sleep(sk), &wait); | |
1874 | } while (!done); | |
1875 | return 0; | |
1876 | } | |
1877 | ||
b97bf3fd | 1878 | /** |
247f0f3c | 1879 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1880 | * @sock: socket structure |
1881 | * @dest: socket address for destination port | |
1882 | * @destlen: size of socket address data structure | |
0c3141e9 | 1883 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1884 | * |
1885 | * Returns 0 on success, errno otherwise | |
1886 | */ | |
247f0f3c YX |
1887 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1888 | int destlen, int flags) | |
b97bf3fd | 1889 | { |
0c3141e9 | 1890 | struct sock *sk = sock->sk; |
f2f8036e | 1891 | struct tipc_sock *tsk = tipc_sk(sk); |
b89741a0 AS |
1892 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1893 | struct msghdr m = {NULL,}; | |
f2f8036e | 1894 | long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout; |
78eb3a53 | 1895 | socket_state previous; |
f2f8036e | 1896 | int res = 0; |
b89741a0 | 1897 | |
0c3141e9 AS |
1898 | lock_sock(sk); |
1899 | ||
f2f8036e | 1900 | /* DGRAM/RDM connect(), just save the destaddr */ |
0c3141e9 | 1901 | if (sock->state == SS_READY) { |
f2f8036e EH |
1902 | if (dst->family == AF_UNSPEC) { |
1903 | memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc)); | |
1904 | tsk->connected = 0; | |
610600c8 SL |
1905 | } else if (destlen != sizeof(struct sockaddr_tipc)) { |
1906 | res = -EINVAL; | |
f2f8036e EH |
1907 | } else { |
1908 | memcpy(&tsk->remote, dest, destlen); | |
1909 | tsk->connected = 1; | |
1910 | } | |
0c3141e9 AS |
1911 | goto exit; |
1912 | } | |
b89741a0 | 1913 | |
b89741a0 AS |
1914 | /* |
1915 | * Reject connection attempt using multicast address | |
1916 | * | |
1917 | * Note: send_msg() validates the rest of the address fields, | |
1918 | * so there's no need to do it here | |
1919 | */ | |
0c3141e9 AS |
1920 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1921 | res = -EINVAL; | |
1922 | goto exit; | |
1923 | } | |
1924 | ||
78eb3a53 | 1925 | previous = sock->state; |
584d24b3 YX |
1926 | switch (sock->state) { |
1927 | case SS_UNCONNECTED: | |
1928 | /* Send a 'SYN-' to destination */ | |
1929 | m.msg_name = dest; | |
1930 | m.msg_namelen = destlen; | |
1931 | ||
1932 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1933 | * indicate send_msg() is never blocked. | |
1934 | */ | |
1935 | if (!timeout) | |
1936 | m.msg_flags = MSG_DONTWAIT; | |
1937 | ||
39a0295f | 1938 | res = __tipc_sendmsg(sock, &m, 0); |
584d24b3 YX |
1939 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1940 | goto exit; | |
1941 | ||
1942 | /* Just entered SS_CONNECTING state; the only | |
1943 | * difference is that return value in non-blocking | |
1944 | * case is EINPROGRESS, rather than EALREADY. | |
1945 | */ | |
1946 | res = -EINPROGRESS; | |
584d24b3 | 1947 | case SS_CONNECTING: |
78eb3a53 YX |
1948 | if (previous == SS_CONNECTING) |
1949 | res = -EALREADY; | |
1950 | if (!timeout) | |
1951 | goto exit; | |
1952 | timeout = msecs_to_jiffies(timeout); | |
1953 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1954 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1955 | break; |
1956 | case SS_CONNECTED: | |
1957 | res = -EISCONN; | |
1958 | break; | |
1959 | default: | |
1960 | res = -EINVAL; | |
78eb3a53 | 1961 | break; |
b89741a0 | 1962 | } |
0c3141e9 AS |
1963 | exit: |
1964 | release_sock(sk); | |
b89741a0 | 1965 | return res; |
b97bf3fd PL |
1966 | } |
1967 | ||
c4307285 | 1968 | /** |
247f0f3c | 1969 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1970 | * @sock: socket structure |
1971 | * @len: (unused) | |
c4307285 | 1972 | * |
b97bf3fd PL |
1973 | * Returns 0 on success, errno otherwise |
1974 | */ | |
247f0f3c | 1975 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1976 | { |
0c3141e9 AS |
1977 | struct sock *sk = sock->sk; |
1978 | int res; | |
1979 | ||
1980 | lock_sock(sk); | |
b97bf3fd | 1981 | |
245f3d34 | 1982 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1983 | res = -EINVAL; |
1984 | else { | |
1985 | sock->state = SS_LISTENING; | |
1986 | res = 0; | |
1987 | } | |
1988 | ||
1989 | release_sock(sk); | |
1990 | return res; | |
b97bf3fd PL |
1991 | } |
1992 | ||
6398e23c YX |
1993 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1994 | { | |
1995 | struct sock *sk = sock->sk; | |
1996 | DEFINE_WAIT(wait); | |
1997 | int err; | |
1998 | ||
1999 | /* True wake-one mechanism for incoming connections: only | |
2000 | * one process gets woken up, not the 'whole herd'. | |
2001 | * Since we do not 'race & poll' for established sockets | |
2002 | * anymore, the common case will execute the loop only once. | |
2003 | */ | |
2004 | for (;;) { | |
2005 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
2006 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 2007 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
2008 | release_sock(sk); |
2009 | timeo = schedule_timeout(timeo); | |
2010 | lock_sock(sk); | |
2011 | } | |
2012 | err = 0; | |
2013 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
2014 | break; | |
2015 | err = -EINVAL; | |
2016 | if (sock->state != SS_LISTENING) | |
2017 | break; | |
6398e23c YX |
2018 | err = -EAGAIN; |
2019 | if (!timeo) | |
2020 | break; | |
143fe22f EH |
2021 | err = sock_intr_errno(timeo); |
2022 | if (signal_pending(current)) | |
2023 | break; | |
6398e23c YX |
2024 | } |
2025 | finish_wait(sk_sleep(sk), &wait); | |
2026 | return err; | |
2027 | } | |
2028 | ||
c4307285 | 2029 | /** |
247f0f3c | 2030 | * tipc_accept - wait for connection request |
b97bf3fd PL |
2031 | * @sock: listening socket |
2032 | * @newsock: new socket that is to be connected | |
2033 | * @flags: file-related flags associated with socket | |
c4307285 | 2034 | * |
b97bf3fd PL |
2035 | * Returns 0 on success, errno otherwise |
2036 | */ | |
247f0f3c | 2037 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 2038 | { |
0fef8f20 | 2039 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 2040 | struct sk_buff *buf; |
301bae56 | 2041 | struct tipc_sock *new_tsock; |
0fef8f20 | 2042 | struct tipc_msg *msg; |
6398e23c | 2043 | long timeo; |
0c3141e9 | 2044 | int res; |
b97bf3fd | 2045 | |
0c3141e9 | 2046 | lock_sock(sk); |
b97bf3fd | 2047 | |
0c3141e9 AS |
2048 | if (sock->state != SS_LISTENING) { |
2049 | res = -EINVAL; | |
b97bf3fd PL |
2050 | goto exit; |
2051 | } | |
6398e23c YX |
2052 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
2053 | res = tipc_wait_for_accept(sock, timeo); | |
2054 | if (res) | |
2055 | goto exit; | |
0c3141e9 AS |
2056 | |
2057 | buf = skb_peek(&sk->sk_receive_queue); | |
2058 | ||
c5fa7b3c | 2059 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
2060 | if (res) |
2061 | goto exit; | |
fdd75ea8 | 2062 | security_sk_clone(sock->sk, new_sock->sk); |
b97bf3fd | 2063 | |
0fef8f20 | 2064 | new_sk = new_sock->sk; |
301bae56 | 2065 | new_tsock = tipc_sk(new_sk); |
0fef8f20 | 2066 | msg = buf_msg(buf); |
b97bf3fd | 2067 | |
0fef8f20 PG |
2068 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
2069 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
2070 | ||
2071 | /* | |
2072 | * Reject any stray messages received by new socket | |
2073 | * before the socket lock was taken (very, very unlikely) | |
2074 | */ | |
2e84c60b | 2075 | tsk_rej_rx_queue(new_sk); |
0fef8f20 PG |
2076 | |
2077 | /* Connect new socket to it's peer */ | |
301bae56 | 2078 | tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); |
0fef8f20 PG |
2079 | new_sock->state = SS_CONNECTED; |
2080 | ||
301bae56 | 2081 | tsk_set_importance(new_tsock, msg_importance(msg)); |
0fef8f20 | 2082 | if (msg_named(msg)) { |
301bae56 JPM |
2083 | new_tsock->conn_type = msg_nametype(msg); |
2084 | new_tsock->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 2085 | } |
0fef8f20 PG |
2086 | |
2087 | /* | |
2088 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
2089 | * Respond to 'SYN+' by queuing it on new socket. | |
2090 | */ | |
2091 | if (!msg_data_sz(msg)) { | |
2092 | struct msghdr m = {NULL,}; | |
2093 | ||
2e84c60b | 2094 | tsk_advance_rx_queue(sk); |
39a0295f | 2095 | __tipc_send_stream(new_sock, &m, 0); |
0fef8f20 PG |
2096 | } else { |
2097 | __skb_dequeue(&sk->sk_receive_queue); | |
2098 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 2099 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
2100 | } |
2101 | release_sock(new_sk); | |
b97bf3fd | 2102 | exit: |
0c3141e9 | 2103 | release_sock(sk); |
b97bf3fd PL |
2104 | return res; |
2105 | } | |
2106 | ||
2107 | /** | |
247f0f3c | 2108 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 2109 | * @sock: socket structure |
e247a8f5 | 2110 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
2111 | * |
2112 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 2113 | * |
b97bf3fd PL |
2114 | * Returns 0 on success, errno otherwise |
2115 | */ | |
247f0f3c | 2116 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 2117 | { |
0c3141e9 | 2118 | struct sock *sk = sock->sk; |
f2f9800d | 2119 | struct net *net = sock_net(sk); |
58ed9442 | 2120 | struct tipc_sock *tsk = tipc_sk(sk); |
a6ca1094 | 2121 | struct sk_buff *skb; |
cda3696d JPM |
2122 | u32 dnode = tsk_peer_node(tsk); |
2123 | u32 dport = tsk_peer_port(tsk); | |
2124 | u32 onode = tipc_own_addr(net); | |
2125 | u32 oport = tsk->portid; | |
b97bf3fd PL |
2126 | int res; |
2127 | ||
e247a8f5 AS |
2128 | if (how != SHUT_RDWR) |
2129 | return -EINVAL; | |
b97bf3fd | 2130 | |
0c3141e9 | 2131 | lock_sock(sk); |
b97bf3fd PL |
2132 | |
2133 | switch (sock->state) { | |
0c3141e9 | 2134 | case SS_CONNECTING: |
b97bf3fd PL |
2135 | case SS_CONNECTED: |
2136 | ||
b97bf3fd | 2137 | restart: |
bcd3ffd4 JPM |
2138 | dnode = tsk_peer_node(tsk); |
2139 | ||
617d3c7a | 2140 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
a6ca1094 YX |
2141 | skb = __skb_dequeue(&sk->sk_receive_queue); |
2142 | if (skb) { | |
2143 | if (TIPC_SKB_CB(skb)->handle != NULL) { | |
2144 | kfree_skb(skb); | |
b97bf3fd PL |
2145 | goto restart; |
2146 | } | |
bcd3ffd4 | 2147 | tipc_sk_respond(sk, skb, TIPC_CONN_SHUTDOWN); |
0c3141e9 | 2148 | } else { |
c5898636 | 2149 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
80e44c22 | 2150 | TIPC_CONN_MSG, SHORT_H_SIZE, |
cda3696d JPM |
2151 | 0, dnode, onode, dport, oport, |
2152 | TIPC_CONN_SHUTDOWN); | |
af9b028e | 2153 | tipc_node_xmit_skb(net, skb, dnode, tsk->portid); |
b97bf3fd | 2154 | } |
301bae56 | 2155 | tsk->connected = 0; |
0c3141e9 | 2156 | sock->state = SS_DISCONNECTING; |
f2f9800d | 2157 | tipc_node_remove_conn(net, dnode, tsk->portid); |
b97bf3fd PL |
2158 | /* fall through */ |
2159 | ||
2160 | case SS_DISCONNECTING: | |
2161 | ||
75031151 | 2162 | /* Discard any unreceived messages */ |
57467e56 | 2163 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
2164 | |
2165 | /* Wake up anyone sleeping in poll */ | |
2166 | sk->sk_state_change(sk); | |
b97bf3fd PL |
2167 | res = 0; |
2168 | break; | |
2169 | ||
2170 | default: | |
2171 | res = -ENOTCONN; | |
2172 | } | |
2173 | ||
0c3141e9 | 2174 | release_sock(sk); |
b97bf3fd PL |
2175 | return res; |
2176 | } | |
2177 | ||
f2f2a96a | 2178 | static void tipc_sk_timeout(unsigned long data) |
57289015 | 2179 | { |
f2f2a96a YX |
2180 | struct tipc_sock *tsk = (struct tipc_sock *)data; |
2181 | struct sock *sk = &tsk->sk; | |
a6ca1094 | 2182 | struct sk_buff *skb = NULL; |
57289015 | 2183 | u32 peer_port, peer_node; |
c5898636 | 2184 | u32 own_node = tsk_own_node(tsk); |
57289015 | 2185 | |
6c9808ce | 2186 | bh_lock_sock(sk); |
301bae56 | 2187 | if (!tsk->connected) { |
6c9808ce JPM |
2188 | bh_unlock_sock(sk); |
2189 | goto exit; | |
57289015 | 2190 | } |
301bae56 JPM |
2191 | peer_port = tsk_peer_port(tsk); |
2192 | peer_node = tsk_peer_node(tsk); | |
57289015 | 2193 | |
301bae56 | 2194 | if (tsk->probing_state == TIPC_CONN_PROBING) { |
b3be5e3e EH |
2195 | if (!sock_owned_by_user(sk)) { |
2196 | sk->sk_socket->state = SS_DISCONNECTING; | |
2197 | tsk->connected = 0; | |
2198 | tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk), | |
2199 | tsk_peer_port(tsk)); | |
2200 | sk->sk_state_change(sk); | |
2201 | } else { | |
2202 | /* Try again later */ | |
2203 | sk_reset_timer(sk, &sk->sk_timer, (HZ / 20)); | |
2204 | } | |
2205 | ||
57289015 | 2206 | } else { |
c5898636 JPM |
2207 | skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, |
2208 | INT_H_SIZE, 0, peer_node, own_node, | |
f2f2a96a | 2209 | peer_port, tsk->portid, TIPC_OK); |
301bae56 | 2210 | tsk->probing_state = TIPC_CONN_PROBING; |
3721e9c7 | 2211 | sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv); |
57289015 JPM |
2212 | } |
2213 | bh_unlock_sock(sk); | |
a6ca1094 | 2214 | if (skb) |
af9b028e | 2215 | tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid); |
6c9808ce | 2216 | exit: |
07f6c4bc | 2217 | sock_put(sk); |
57289015 JPM |
2218 | } |
2219 | ||
301bae56 | 2220 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2221 | struct tipc_name_seq const *seq) |
2222 | { | |
f2f9800d | 2223 | struct net *net = sock_net(&tsk->sk); |
0fc87aae JPM |
2224 | struct publication *publ; |
2225 | u32 key; | |
2226 | ||
301bae56 | 2227 | if (tsk->connected) |
0fc87aae | 2228 | return -EINVAL; |
07f6c4bc YX |
2229 | key = tsk->portid + tsk->pub_count + 1; |
2230 | if (key == tsk->portid) | |
0fc87aae JPM |
2231 | return -EADDRINUSE; |
2232 | ||
f2f9800d | 2233 | publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, |
07f6c4bc | 2234 | scope, tsk->portid, key); |
0fc87aae JPM |
2235 | if (unlikely(!publ)) |
2236 | return -EINVAL; | |
2237 | ||
301bae56 JPM |
2238 | list_add(&publ->pport_list, &tsk->publications); |
2239 | tsk->pub_count++; | |
2240 | tsk->published = 1; | |
0fc87aae JPM |
2241 | return 0; |
2242 | } | |
2243 | ||
301bae56 | 2244 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2245 | struct tipc_name_seq const *seq) |
2246 | { | |
f2f9800d | 2247 | struct net *net = sock_net(&tsk->sk); |
0fc87aae JPM |
2248 | struct publication *publ; |
2249 | struct publication *safe; | |
2250 | int rc = -EINVAL; | |
2251 | ||
301bae56 | 2252 | list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) { |
0fc87aae JPM |
2253 | if (seq) { |
2254 | if (publ->scope != scope) | |
2255 | continue; | |
2256 | if (publ->type != seq->type) | |
2257 | continue; | |
2258 | if (publ->lower != seq->lower) | |
2259 | continue; | |
2260 | if (publ->upper != seq->upper) | |
2261 | break; | |
f2f9800d | 2262 | tipc_nametbl_withdraw(net, publ->type, publ->lower, |
0fc87aae JPM |
2263 | publ->ref, publ->key); |
2264 | rc = 0; | |
2265 | break; | |
2266 | } | |
f2f9800d | 2267 | tipc_nametbl_withdraw(net, publ->type, publ->lower, |
0fc87aae JPM |
2268 | publ->ref, publ->key); |
2269 | rc = 0; | |
2270 | } | |
301bae56 JPM |
2271 | if (list_empty(&tsk->publications)) |
2272 | tsk->published = 0; | |
0fc87aae JPM |
2273 | return rc; |
2274 | } | |
2275 | ||
5a9ee0be JPM |
2276 | /* tipc_sk_reinit: set non-zero address in all existing sockets |
2277 | * when we go from standalone to network mode. | |
2278 | */ | |
e05b31f4 | 2279 | void tipc_sk_reinit(struct net *net) |
5a9ee0be | 2280 | { |
e05b31f4 | 2281 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
07f6c4bc YX |
2282 | const struct bucket_table *tbl; |
2283 | struct rhash_head *pos; | |
2284 | struct tipc_sock *tsk; | |
5a9ee0be | 2285 | struct tipc_msg *msg; |
07f6c4bc | 2286 | int i; |
5a9ee0be | 2287 | |
07f6c4bc | 2288 | rcu_read_lock(); |
e05b31f4 | 2289 | tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht); |
07f6c4bc YX |
2290 | for (i = 0; i < tbl->size; i++) { |
2291 | rht_for_each_entry_rcu(tsk, pos, tbl, i, node) { | |
2292 | spin_lock_bh(&tsk->sk.sk_lock.slock); | |
2293 | msg = &tsk->phdr; | |
34747539 YX |
2294 | msg_set_prevnode(msg, tn->own_addr); |
2295 | msg_set_orignode(msg, tn->own_addr); | |
07f6c4bc YX |
2296 | spin_unlock_bh(&tsk->sk.sk_lock.slock); |
2297 | } | |
5a9ee0be | 2298 | } |
07f6c4bc | 2299 | rcu_read_unlock(); |
5a9ee0be JPM |
2300 | } |
2301 | ||
e05b31f4 | 2302 | static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) |
808d90f9 | 2303 | { |
e05b31f4 | 2304 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
07f6c4bc | 2305 | struct tipc_sock *tsk; |
808d90f9 | 2306 | |
07f6c4bc | 2307 | rcu_read_lock(); |
6cca7289 | 2308 | tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params); |
07f6c4bc YX |
2309 | if (tsk) |
2310 | sock_hold(&tsk->sk); | |
2311 | rcu_read_unlock(); | |
808d90f9 | 2312 | |
07f6c4bc | 2313 | return tsk; |
808d90f9 JPM |
2314 | } |
2315 | ||
07f6c4bc | 2316 | static int tipc_sk_insert(struct tipc_sock *tsk) |
808d90f9 | 2317 | { |
e05b31f4 YX |
2318 | struct sock *sk = &tsk->sk; |
2319 | struct net *net = sock_net(sk); | |
2320 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
07f6c4bc YX |
2321 | u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; |
2322 | u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; | |
808d90f9 | 2323 | |
07f6c4bc YX |
2324 | while (remaining--) { |
2325 | portid++; | |
2326 | if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) | |
2327 | portid = TIPC_MIN_PORT; | |
2328 | tsk->portid = portid; | |
2329 | sock_hold(&tsk->sk); | |
6cca7289 HX |
2330 | if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node, |
2331 | tsk_rht_params)) | |
07f6c4bc YX |
2332 | return 0; |
2333 | sock_put(&tsk->sk); | |
808d90f9 JPM |
2334 | } |
2335 | ||
07f6c4bc | 2336 | return -1; |
808d90f9 JPM |
2337 | } |
2338 | ||
07f6c4bc | 2339 | static void tipc_sk_remove(struct tipc_sock *tsk) |
808d90f9 | 2340 | { |
07f6c4bc | 2341 | struct sock *sk = &tsk->sk; |
e05b31f4 | 2342 | struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); |
808d90f9 | 2343 | |
6cca7289 | 2344 | if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) { |
07f6c4bc YX |
2345 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
2346 | __sock_put(sk); | |
808d90f9 | 2347 | } |
808d90f9 JPM |
2348 | } |
2349 | ||
6cca7289 HX |
2350 | static const struct rhashtable_params tsk_rht_params = { |
2351 | .nelem_hint = 192, | |
2352 | .head_offset = offsetof(struct tipc_sock, node), | |
2353 | .key_offset = offsetof(struct tipc_sock, portid), | |
2354 | .key_len = sizeof(u32), /* portid */ | |
6cca7289 HX |
2355 | .max_size = 1048576, |
2356 | .min_size = 256, | |
b5e2c150 | 2357 | .automatic_shrinking = true, |
6cca7289 HX |
2358 | }; |
2359 | ||
e05b31f4 | 2360 | int tipc_sk_rht_init(struct net *net) |
808d90f9 | 2361 | { |
e05b31f4 | 2362 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
6cca7289 HX |
2363 | |
2364 | return rhashtable_init(&tn->sk_rht, &tsk_rht_params); | |
808d90f9 JPM |
2365 | } |
2366 | ||
e05b31f4 | 2367 | void tipc_sk_rht_destroy(struct net *net) |
808d90f9 | 2368 | { |
e05b31f4 YX |
2369 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2370 | ||
07f6c4bc YX |
2371 | /* Wait for socket readers to complete */ |
2372 | synchronize_net(); | |
808d90f9 | 2373 | |
e05b31f4 | 2374 | rhashtable_destroy(&tn->sk_rht); |
808d90f9 JPM |
2375 | } |
2376 | ||
b97bf3fd | 2377 | /** |
247f0f3c | 2378 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2379 | * @sock: socket structure |
2380 | * @lvl: option level | |
2381 | * @opt: option identifier | |
2382 | * @ov: pointer to new option value | |
2383 | * @ol: length of option value | |
c4307285 YH |
2384 | * |
2385 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2386 | * (to ease compatibility). |
c4307285 | 2387 | * |
b97bf3fd PL |
2388 | * Returns 0 on success, errno otherwise |
2389 | */ | |
247f0f3c YX |
2390 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2391 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2392 | { |
0c3141e9 | 2393 | struct sock *sk = sock->sk; |
58ed9442 | 2394 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
2395 | u32 value; |
2396 | int res; | |
2397 | ||
c4307285 YH |
2398 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2399 | return 0; | |
b97bf3fd PL |
2400 | if (lvl != SOL_TIPC) |
2401 | return -ENOPROTOOPT; | |
2402 | if (ol < sizeof(value)) | |
2403 | return -EINVAL; | |
2db9983a AS |
2404 | res = get_user(value, (u32 __user *)ov); |
2405 | if (res) | |
b97bf3fd PL |
2406 | return res; |
2407 | ||
0c3141e9 | 2408 | lock_sock(sk); |
c4307285 | 2409 | |
b97bf3fd PL |
2410 | switch (opt) { |
2411 | case TIPC_IMPORTANCE: | |
301bae56 | 2412 | res = tsk_set_importance(tsk, value); |
b97bf3fd PL |
2413 | break; |
2414 | case TIPC_SRC_DROPPABLE: | |
2415 | if (sock->type != SOCK_STREAM) | |
301bae56 | 2416 | tsk_set_unreliable(tsk, value); |
c4307285 | 2417 | else |
b97bf3fd PL |
2418 | res = -ENOPROTOOPT; |
2419 | break; | |
2420 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2421 | tsk_set_unreturnable(tsk, value); |
b97bf3fd PL |
2422 | break; |
2423 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2424 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2425 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2426 | break; |
2427 | default: | |
2428 | res = -EINVAL; | |
2429 | } | |
2430 | ||
0c3141e9 AS |
2431 | release_sock(sk); |
2432 | ||
b97bf3fd PL |
2433 | return res; |
2434 | } | |
2435 | ||
2436 | /** | |
247f0f3c | 2437 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2438 | * @sock: socket structure |
2439 | * @lvl: option level | |
2440 | * @opt: option identifier | |
2441 | * @ov: receptacle for option value | |
2442 | * @ol: receptacle for length of option value | |
c4307285 YH |
2443 | * |
2444 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2445 | * (to ease compatibility). |
c4307285 | 2446 | * |
b97bf3fd PL |
2447 | * Returns 0 on success, errno otherwise |
2448 | */ | |
247f0f3c YX |
2449 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2450 | char __user *ov, int __user *ol) | |
b97bf3fd | 2451 | { |
0c3141e9 | 2452 | struct sock *sk = sock->sk; |
58ed9442 | 2453 | struct tipc_sock *tsk = tipc_sk(sk); |
c4307285 | 2454 | int len; |
b97bf3fd | 2455 | u32 value; |
c4307285 | 2456 | int res; |
b97bf3fd | 2457 | |
c4307285 YH |
2458 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2459 | return put_user(0, ol); | |
b97bf3fd PL |
2460 | if (lvl != SOL_TIPC) |
2461 | return -ENOPROTOOPT; | |
2db9983a AS |
2462 | res = get_user(len, ol); |
2463 | if (res) | |
c4307285 | 2464 | return res; |
b97bf3fd | 2465 | |
0c3141e9 | 2466 | lock_sock(sk); |
b97bf3fd PL |
2467 | |
2468 | switch (opt) { | |
2469 | case TIPC_IMPORTANCE: | |
301bae56 | 2470 | value = tsk_importance(tsk); |
b97bf3fd PL |
2471 | break; |
2472 | case TIPC_SRC_DROPPABLE: | |
301bae56 | 2473 | value = tsk_unreliable(tsk); |
b97bf3fd PL |
2474 | break; |
2475 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2476 | value = tsk_unreturnable(tsk); |
b97bf3fd PL |
2477 | break; |
2478 | case TIPC_CONN_TIMEOUT: | |
301bae56 | 2479 | value = tsk->conn_timeout; |
0c3141e9 | 2480 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2481 | break; |
0e65967e | 2482 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2483 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2484 | break; |
0e65967e | 2485 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2486 | value = skb_queue_len(&sk->sk_receive_queue); |
2487 | break; | |
b97bf3fd PL |
2488 | default: |
2489 | res = -EINVAL; | |
2490 | } | |
2491 | ||
0c3141e9 AS |
2492 | release_sock(sk); |
2493 | ||
25860c3b PG |
2494 | if (res) |
2495 | return res; /* "get" failed */ | |
b97bf3fd | 2496 | |
25860c3b PG |
2497 | if (len < sizeof(value)) |
2498 | return -EINVAL; | |
2499 | ||
2500 | if (copy_to_user(ov, &value, sizeof(value))) | |
2501 | return -EFAULT; | |
2502 | ||
2503 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2504 | } |
2505 | ||
f2f9800d | 2506 | static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
78acb1f9 | 2507 | { |
f2f9800d | 2508 | struct sock *sk = sock->sk; |
78acb1f9 EH |
2509 | struct tipc_sioc_ln_req lnr; |
2510 | void __user *argp = (void __user *)arg; | |
2511 | ||
2512 | switch (cmd) { | |
2513 | case SIOCGETLINKNAME: | |
2514 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2515 | return -EFAULT; | |
f2f9800d YX |
2516 | if (!tipc_node_get_linkname(sock_net(sk), |
2517 | lnr.bearer_id & 0xffff, lnr.peer, | |
78acb1f9 EH |
2518 | lnr.linkname, TIPC_MAX_LINK_NAME)) { |
2519 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2520 | return -EFAULT; | |
2521 | return 0; | |
2522 | } | |
2523 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2524 | default: |
2525 | return -ENOIOCTLCMD; | |
2526 | } | |
2527 | } | |
2528 | ||
ae86b9e3 BH |
2529 | /* Protocol switches for the various types of TIPC sockets */ |
2530 | ||
bca65eae | 2531 | static const struct proto_ops msg_ops = { |
0e65967e | 2532 | .owner = THIS_MODULE, |
b97bf3fd | 2533 | .family = AF_TIPC, |
247f0f3c YX |
2534 | .release = tipc_release, |
2535 | .bind = tipc_bind, | |
2536 | .connect = tipc_connect, | |
5eee6a6d | 2537 | .socketpair = sock_no_socketpair, |
245f3d34 | 2538 | .accept = sock_no_accept, |
247f0f3c YX |
2539 | .getname = tipc_getname, |
2540 | .poll = tipc_poll, | |
78acb1f9 | 2541 | .ioctl = tipc_ioctl, |
245f3d34 | 2542 | .listen = sock_no_listen, |
247f0f3c YX |
2543 | .shutdown = tipc_shutdown, |
2544 | .setsockopt = tipc_setsockopt, | |
2545 | .getsockopt = tipc_getsockopt, | |
2546 | .sendmsg = tipc_sendmsg, | |
2547 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2548 | .mmap = sock_no_mmap, |
2549 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2550 | }; |
2551 | ||
bca65eae | 2552 | static const struct proto_ops packet_ops = { |
0e65967e | 2553 | .owner = THIS_MODULE, |
b97bf3fd | 2554 | .family = AF_TIPC, |
247f0f3c YX |
2555 | .release = tipc_release, |
2556 | .bind = tipc_bind, | |
2557 | .connect = tipc_connect, | |
5eee6a6d | 2558 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2559 | .accept = tipc_accept, |
2560 | .getname = tipc_getname, | |
2561 | .poll = tipc_poll, | |
78acb1f9 | 2562 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2563 | .listen = tipc_listen, |
2564 | .shutdown = tipc_shutdown, | |
2565 | .setsockopt = tipc_setsockopt, | |
2566 | .getsockopt = tipc_getsockopt, | |
2567 | .sendmsg = tipc_send_packet, | |
2568 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2569 | .mmap = sock_no_mmap, |
2570 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2571 | }; |
2572 | ||
bca65eae | 2573 | static const struct proto_ops stream_ops = { |
0e65967e | 2574 | .owner = THIS_MODULE, |
b97bf3fd | 2575 | .family = AF_TIPC, |
247f0f3c YX |
2576 | .release = tipc_release, |
2577 | .bind = tipc_bind, | |
2578 | .connect = tipc_connect, | |
5eee6a6d | 2579 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2580 | .accept = tipc_accept, |
2581 | .getname = tipc_getname, | |
2582 | .poll = tipc_poll, | |
78acb1f9 | 2583 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2584 | .listen = tipc_listen, |
2585 | .shutdown = tipc_shutdown, | |
2586 | .setsockopt = tipc_setsockopt, | |
2587 | .getsockopt = tipc_getsockopt, | |
2588 | .sendmsg = tipc_send_stream, | |
2589 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2590 | .mmap = sock_no_mmap, |
2591 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2592 | }; |
2593 | ||
bca65eae | 2594 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2595 | .owner = THIS_MODULE, |
b97bf3fd | 2596 | .family = AF_TIPC, |
c5fa7b3c | 2597 | .create = tipc_sk_create |
b97bf3fd PL |
2598 | }; |
2599 | ||
2600 | static struct proto tipc_proto = { | |
2601 | .name = "TIPC", | |
2602 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2603 | .obj_size = sizeof(struct tipc_sock), |
2604 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2605 | }; |
2606 | ||
2607 | /** | |
4323add6 | 2608 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2609 | * |
b97bf3fd PL |
2610 | * Returns 0 on success, errno otherwise |
2611 | */ | |
4323add6 | 2612 | int tipc_socket_init(void) |
b97bf3fd PL |
2613 | { |
2614 | int res; | |
2615 | ||
c4307285 | 2616 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2617 | if (res) { |
2cf8aa19 | 2618 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2619 | goto out; |
2620 | } | |
2621 | ||
2622 | res = sock_register(&tipc_family_ops); | |
2623 | if (res) { | |
2cf8aa19 | 2624 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2625 | proto_unregister(&tipc_proto); |
2626 | goto out; | |
2627 | } | |
b97bf3fd PL |
2628 | out: |
2629 | return res; | |
2630 | } | |
2631 | ||
2632 | /** | |
4323add6 | 2633 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2634 | */ |
4323add6 | 2635 | void tipc_socket_stop(void) |
b97bf3fd | 2636 | { |
b97bf3fd PL |
2637 | sock_unregister(tipc_family_ops.family); |
2638 | proto_unregister(&tipc_proto); | |
2639 | } | |
34b78a12 RA |
2640 | |
2641 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 | 2642 | static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) |
34b78a12 RA |
2643 | { |
2644 | u32 peer_node; | |
2645 | u32 peer_port; | |
2646 | struct nlattr *nest; | |
2647 | ||
2648 | peer_node = tsk_peer_node(tsk); | |
2649 | peer_port = tsk_peer_port(tsk); | |
2650 | ||
2651 | nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON); | |
2652 | ||
2653 | if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) | |
2654 | goto msg_full; | |
2655 | if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) | |
2656 | goto msg_full; | |
2657 | ||
2658 | if (tsk->conn_type != 0) { | |
2659 | if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) | |
2660 | goto msg_full; | |
2661 | if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) | |
2662 | goto msg_full; | |
2663 | if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) | |
2664 | goto msg_full; | |
2665 | } | |
2666 | nla_nest_end(skb, nest); | |
2667 | ||
2668 | return 0; | |
2669 | ||
2670 | msg_full: | |
2671 | nla_nest_cancel(skb, nest); | |
2672 | ||
2673 | return -EMSGSIZE; | |
2674 | } | |
2675 | ||
2676 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2677 | static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, |
2678 | struct tipc_sock *tsk) | |
34b78a12 RA |
2679 | { |
2680 | int err; | |
2681 | void *hdr; | |
2682 | struct nlattr *attrs; | |
34747539 YX |
2683 | struct net *net = sock_net(skb->sk); |
2684 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
34b78a12 RA |
2685 | |
2686 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, | |
bfb3e5dd | 2687 | &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); |
34b78a12 RA |
2688 | if (!hdr) |
2689 | goto msg_cancel; | |
2690 | ||
2691 | attrs = nla_nest_start(skb, TIPC_NLA_SOCK); | |
2692 | if (!attrs) | |
2693 | goto genlmsg_cancel; | |
07f6c4bc | 2694 | if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid)) |
34b78a12 | 2695 | goto attr_msg_cancel; |
34747539 | 2696 | if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr)) |
34b78a12 RA |
2697 | goto attr_msg_cancel; |
2698 | ||
2699 | if (tsk->connected) { | |
2700 | err = __tipc_nl_add_sk_con(skb, tsk); | |
2701 | if (err) | |
2702 | goto attr_msg_cancel; | |
2703 | } else if (!list_empty(&tsk->publications)) { | |
2704 | if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) | |
2705 | goto attr_msg_cancel; | |
2706 | } | |
2707 | nla_nest_end(skb, attrs); | |
2708 | genlmsg_end(skb, hdr); | |
2709 | ||
2710 | return 0; | |
2711 | ||
2712 | attr_msg_cancel: | |
2713 | nla_nest_cancel(skb, attrs); | |
2714 | genlmsg_cancel: | |
2715 | genlmsg_cancel(skb, hdr); | |
2716 | msg_cancel: | |
2717 | return -EMSGSIZE; | |
2718 | } | |
2719 | ||
2720 | int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2721 | { | |
2722 | int err; | |
2723 | struct tipc_sock *tsk; | |
07f6c4bc YX |
2724 | const struct bucket_table *tbl; |
2725 | struct rhash_head *pos; | |
e05b31f4 YX |
2726 | struct net *net = sock_net(skb->sk); |
2727 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
d6e164e3 RA |
2728 | u32 tbl_id = cb->args[0]; |
2729 | u32 prev_portid = cb->args[1]; | |
34b78a12 | 2730 | |
07f6c4bc | 2731 | rcu_read_lock(); |
e05b31f4 | 2732 | tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht); |
d6e164e3 RA |
2733 | for (; tbl_id < tbl->size; tbl_id++) { |
2734 | rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) { | |
07f6c4bc | 2735 | spin_lock_bh(&tsk->sk.sk_lock.slock); |
d6e164e3 RA |
2736 | if (prev_portid && prev_portid != tsk->portid) { |
2737 | spin_unlock_bh(&tsk->sk.sk_lock.slock); | |
2738 | continue; | |
2739 | } | |
2740 | ||
07f6c4bc | 2741 | err = __tipc_nl_add_sk(skb, cb, tsk); |
d6e164e3 RA |
2742 | if (err) { |
2743 | prev_portid = tsk->portid; | |
2744 | spin_unlock_bh(&tsk->sk.sk_lock.slock); | |
2745 | goto out; | |
2746 | } | |
2747 | prev_portid = 0; | |
07f6c4bc | 2748 | spin_unlock_bh(&tsk->sk.sk_lock.slock); |
07f6c4bc | 2749 | } |
34b78a12 | 2750 | } |
d6e164e3 | 2751 | out: |
07f6c4bc | 2752 | rcu_read_unlock(); |
d6e164e3 RA |
2753 | cb->args[0] = tbl_id; |
2754 | cb->args[1] = prev_portid; | |
34b78a12 RA |
2755 | |
2756 | return skb->len; | |
2757 | } | |
1a1a143d RA |
2758 | |
2759 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2760 | static int __tipc_nl_add_sk_publ(struct sk_buff *skb, |
2761 | struct netlink_callback *cb, | |
2762 | struct publication *publ) | |
1a1a143d RA |
2763 | { |
2764 | void *hdr; | |
2765 | struct nlattr *attrs; | |
2766 | ||
2767 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, | |
bfb3e5dd | 2768 | &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); |
1a1a143d RA |
2769 | if (!hdr) |
2770 | goto msg_cancel; | |
2771 | ||
2772 | attrs = nla_nest_start(skb, TIPC_NLA_PUBL); | |
2773 | if (!attrs) | |
2774 | goto genlmsg_cancel; | |
2775 | ||
2776 | if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) | |
2777 | goto attr_msg_cancel; | |
2778 | if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) | |
2779 | goto attr_msg_cancel; | |
2780 | if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) | |
2781 | goto attr_msg_cancel; | |
2782 | if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) | |
2783 | goto attr_msg_cancel; | |
2784 | ||
2785 | nla_nest_end(skb, attrs); | |
2786 | genlmsg_end(skb, hdr); | |
2787 | ||
2788 | return 0; | |
2789 | ||
2790 | attr_msg_cancel: | |
2791 | nla_nest_cancel(skb, attrs); | |
2792 | genlmsg_cancel: | |
2793 | genlmsg_cancel(skb, hdr); | |
2794 | msg_cancel: | |
2795 | return -EMSGSIZE; | |
2796 | } | |
2797 | ||
2798 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2799 | static int __tipc_nl_list_sk_publ(struct sk_buff *skb, |
2800 | struct netlink_callback *cb, | |
2801 | struct tipc_sock *tsk, u32 *last_publ) | |
1a1a143d RA |
2802 | { |
2803 | int err; | |
2804 | struct publication *p; | |
2805 | ||
2806 | if (*last_publ) { | |
2807 | list_for_each_entry(p, &tsk->publications, pport_list) { | |
2808 | if (p->key == *last_publ) | |
2809 | break; | |
2810 | } | |
2811 | if (p->key != *last_publ) { | |
2812 | /* We never set seq or call nl_dump_check_consistent() | |
2813 | * this means that setting prev_seq here will cause the | |
2814 | * consistence check to fail in the netlink callback | |
2815 | * handler. Resulting in the last NLMSG_DONE message | |
2816 | * having the NLM_F_DUMP_INTR flag set. | |
2817 | */ | |
2818 | cb->prev_seq = 1; | |
2819 | *last_publ = 0; | |
2820 | return -EPIPE; | |
2821 | } | |
2822 | } else { | |
2823 | p = list_first_entry(&tsk->publications, struct publication, | |
2824 | pport_list); | |
2825 | } | |
2826 | ||
2827 | list_for_each_entry_from(p, &tsk->publications, pport_list) { | |
2828 | err = __tipc_nl_add_sk_publ(skb, cb, p); | |
2829 | if (err) { | |
2830 | *last_publ = p->key; | |
2831 | return err; | |
2832 | } | |
2833 | } | |
2834 | *last_publ = 0; | |
2835 | ||
2836 | return 0; | |
2837 | } | |
2838 | ||
2839 | int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2840 | { | |
2841 | int err; | |
07f6c4bc | 2842 | u32 tsk_portid = cb->args[0]; |
1a1a143d RA |
2843 | u32 last_publ = cb->args[1]; |
2844 | u32 done = cb->args[2]; | |
e05b31f4 | 2845 | struct net *net = sock_net(skb->sk); |
1a1a143d RA |
2846 | struct tipc_sock *tsk; |
2847 | ||
07f6c4bc | 2848 | if (!tsk_portid) { |
1a1a143d RA |
2849 | struct nlattr **attrs; |
2850 | struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; | |
2851 | ||
2852 | err = tipc_nlmsg_parse(cb->nlh, &attrs); | |
2853 | if (err) | |
2854 | return err; | |
2855 | ||
45e093ae RA |
2856 | if (!attrs[TIPC_NLA_SOCK]) |
2857 | return -EINVAL; | |
2858 | ||
1a1a143d RA |
2859 | err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, |
2860 | attrs[TIPC_NLA_SOCK], | |
2861 | tipc_nl_sock_policy); | |
2862 | if (err) | |
2863 | return err; | |
2864 | ||
2865 | if (!sock[TIPC_NLA_SOCK_REF]) | |
2866 | return -EINVAL; | |
2867 | ||
07f6c4bc | 2868 | tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); |
1a1a143d RA |
2869 | } |
2870 | ||
2871 | if (done) | |
2872 | return 0; | |
2873 | ||
e05b31f4 | 2874 | tsk = tipc_sk_lookup(net, tsk_portid); |
1a1a143d RA |
2875 | if (!tsk) |
2876 | return -EINVAL; | |
2877 | ||
2878 | lock_sock(&tsk->sk); | |
2879 | err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); | |
2880 | if (!err) | |
2881 | done = 1; | |
2882 | release_sock(&tsk->sk); | |
07f6c4bc | 2883 | sock_put(&tsk->sk); |
1a1a143d | 2884 | |
07f6c4bc | 2885 | cb->args[0] = tsk_portid; |
1a1a143d RA |
2886 | cb->args[1] = last_publ; |
2887 | cb->args[2] = done; | |
2888 | ||
2889 | return skb->len; | |
2890 | } |