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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 YX |
37 | #include <linux/rhashtable.h> |
38 | #include <linux/jhash.h> | |
b97bf3fd | 39 | #include "core.h" |
e2dafe87 | 40 | #include "name_table.h" |
78acb1f9 | 41 | #include "node.h" |
e2dafe87 | 42 | #include "link.h" |
c637c103 | 43 | #include "name_distr.h" |
2e84c60b | 44 | #include "socket.h" |
2cf8aa19 | 45 | |
07f6c4bc YX |
46 | #define SS_LISTENING -1 /* socket is listening */ |
47 | #define SS_READY -2 /* socket is connectionless */ | |
b97bf3fd | 48 | |
07f6c4bc | 49 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
2f55c437 | 50 | #define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */ |
07f6c4bc YX |
51 | #define TIPC_FWD_MSG 1 |
52 | #define TIPC_CONN_OK 0 | |
53 | #define TIPC_CONN_PROBING 1 | |
54 | #define TIPC_MAX_PORT 0xffffffff | |
55 | #define TIPC_MIN_PORT 1 | |
301bae56 JPM |
56 | |
57 | /** | |
58 | * struct tipc_sock - TIPC socket structure | |
59 | * @sk: socket - interacts with 'port' and with user via the socket API | |
60 | * @connected: non-zero if port is currently connected to a peer port | |
61 | * @conn_type: TIPC type used when connection was established | |
62 | * @conn_instance: TIPC instance used when connection was established | |
63 | * @published: non-zero if port has one or more associated names | |
64 | * @max_pkt: maximum packet size "hint" used when building messages sent by port | |
07f6c4bc | 65 | * @portid: unique port identity in TIPC socket hash table |
301bae56 JPM |
66 | * @phdr: preformatted message header used when sending messages |
67 | * @port_list: adjacent ports in TIPC's global list of ports | |
68 | * @publications: list of publications for port | |
69 | * @pub_count: total # of publications port has made during its lifetime | |
70 | * @probing_state: | |
2f55c437 | 71 | * @probing_intv: |
301bae56 JPM |
72 | * @conn_timeout: the time we can wait for an unresponded setup request |
73 | * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue | |
74 | * @link_cong: non-zero if owner must sleep because of link congestion | |
75 | * @sent_unacked: # messages sent by socket, and not yet acked by peer | |
76 | * @rcv_unacked: # messages read by user, but not yet acked back to peer | |
07f6c4bc YX |
77 | * @node: hash table node |
78 | * @rcu: rcu struct for tipc_sock | |
301bae56 JPM |
79 | */ |
80 | struct tipc_sock { | |
81 | struct sock sk; | |
82 | int connected; | |
83 | u32 conn_type; | |
84 | u32 conn_instance; | |
85 | int published; | |
86 | u32 max_pkt; | |
07f6c4bc | 87 | u32 portid; |
301bae56 JPM |
88 | struct tipc_msg phdr; |
89 | struct list_head sock_list; | |
90 | struct list_head publications; | |
91 | u32 pub_count; | |
92 | u32 probing_state; | |
2f55c437 | 93 | unsigned long probing_intv; |
301bae56 JPM |
94 | uint conn_timeout; |
95 | atomic_t dupl_rcvcnt; | |
96 | bool link_cong; | |
97 | uint sent_unacked; | |
98 | uint rcv_unacked; | |
07f6c4bc YX |
99 | struct rhash_head node; |
100 | struct rcu_head rcu; | |
301bae56 | 101 | }; |
b97bf3fd | 102 | |
4f4482dc | 103 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
676d2369 | 104 | static void tipc_data_ready(struct sock *sk); |
f288bef4 | 105 | static void tipc_write_space(struct sock *sk); |
247f0f3c YX |
106 | static int tipc_release(struct socket *sock); |
107 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags); | |
0abd8ff2 | 108 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p); |
f2f2a96a | 109 | static void tipc_sk_timeout(unsigned long data); |
301bae56 | 110 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae | 111 | struct tipc_name_seq const *seq); |
301bae56 | 112 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae | 113 | struct tipc_name_seq const *seq); |
e05b31f4 | 114 | static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid); |
07f6c4bc YX |
115 | static int tipc_sk_insert(struct tipc_sock *tsk); |
116 | static void tipc_sk_remove(struct tipc_sock *tsk); | |
b97bf3fd | 117 | |
bca65eae FW |
118 | static const struct proto_ops packet_ops; |
119 | static const struct proto_ops stream_ops; | |
120 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
121 | |
122 | static struct proto tipc_proto; | |
c5fa7b3c | 123 | static struct proto tipc_proto_kern; |
b97bf3fd | 124 | |
1a1a143d RA |
125 | static const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = { |
126 | [TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC }, | |
127 | [TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 }, | |
128 | [TIPC_NLA_SOCK_REF] = { .type = NLA_U32 }, | |
129 | [TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED }, | |
130 | [TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG } | |
131 | }; | |
132 | ||
c4307285 | 133 | /* |
0c3141e9 AS |
134 | * Revised TIPC socket locking policy: |
135 | * | |
136 | * Most socket operations take the standard socket lock when they start | |
137 | * and hold it until they finish (or until they need to sleep). Acquiring | |
138 | * this lock grants the owner exclusive access to the fields of the socket | |
139 | * data structures, with the exception of the backlog queue. A few socket | |
140 | * operations can be done without taking the socket lock because they only | |
141 | * read socket information that never changes during the life of the socket. | |
142 | * | |
143 | * Socket operations may acquire the lock for the associated TIPC port if they | |
144 | * need to perform an operation on the port. If any routine needs to acquire | |
145 | * both the socket lock and the port lock it must take the socket lock first | |
146 | * to avoid the risk of deadlock. | |
147 | * | |
148 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
149 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
150 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
151 | * and either handles the message itself or adds it to the socket's backlog | |
152 | * queue; in the latter case the queued message is processed once the process | |
153 | * owning the socket lock releases it. | |
154 | * | |
155 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
156 | * the problem of a blocked socket operation preventing any other operations | |
157 | * from occurring. However, applications must be careful if they have | |
158 | * multiple threads trying to send (or receive) on the same socket, as these | |
159 | * operations might interfere with each other. For example, doing a connect | |
160 | * and a receive at the same time might allow the receive to consume the | |
161 | * ACK message meant for the connect. While additional work could be done | |
162 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
163 | * | |
164 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
165 | * that another operation that must be performed in a non-blocking manner is | |
166 | * not delayed for very long because the lock has already been taken. | |
167 | * | |
168 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
169 | * constant over its lifetime; such fields can be examined without taking | |
170 | * the socket lock and/or port lock, and do not need to be re-read even | |
171 | * after resuming processing after waiting. These fields include: | |
172 | * - socket type | |
173 | * - pointer to socket sk structure (aka tipc_sock structure) | |
174 | * - pointer to port structure | |
175 | * - port reference | |
176 | */ | |
177 | ||
c5898636 JPM |
178 | static u32 tsk_own_node(struct tipc_sock *tsk) |
179 | { | |
180 | return msg_prevnode(&tsk->phdr); | |
181 | } | |
182 | ||
301bae56 | 183 | static u32 tsk_peer_node(struct tipc_sock *tsk) |
2e84c60b | 184 | { |
301bae56 | 185 | return msg_destnode(&tsk->phdr); |
2e84c60b JPM |
186 | } |
187 | ||
301bae56 | 188 | static u32 tsk_peer_port(struct tipc_sock *tsk) |
2e84c60b | 189 | { |
301bae56 | 190 | return msg_destport(&tsk->phdr); |
2e84c60b JPM |
191 | } |
192 | ||
301bae56 | 193 | static bool tsk_unreliable(struct tipc_sock *tsk) |
2e84c60b | 194 | { |
301bae56 | 195 | return msg_src_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
196 | } |
197 | ||
301bae56 | 198 | static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable) |
2e84c60b | 199 | { |
301bae56 | 200 | msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0); |
2e84c60b JPM |
201 | } |
202 | ||
301bae56 | 203 | static bool tsk_unreturnable(struct tipc_sock *tsk) |
2e84c60b | 204 | { |
301bae56 | 205 | return msg_dest_droppable(&tsk->phdr) != 0; |
2e84c60b JPM |
206 | } |
207 | ||
301bae56 | 208 | static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable) |
2e84c60b | 209 | { |
301bae56 | 210 | msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0); |
2e84c60b JPM |
211 | } |
212 | ||
301bae56 | 213 | static int tsk_importance(struct tipc_sock *tsk) |
2e84c60b | 214 | { |
301bae56 | 215 | return msg_importance(&tsk->phdr); |
2e84c60b JPM |
216 | } |
217 | ||
301bae56 | 218 | static int tsk_set_importance(struct tipc_sock *tsk, int imp) |
2e84c60b JPM |
219 | { |
220 | if (imp > TIPC_CRITICAL_IMPORTANCE) | |
221 | return -EINVAL; | |
301bae56 | 222 | msg_set_importance(&tsk->phdr, (u32)imp); |
2e84c60b JPM |
223 | return 0; |
224 | } | |
8826cde6 | 225 | |
301bae56 JPM |
226 | static struct tipc_sock *tipc_sk(const struct sock *sk) |
227 | { | |
228 | return container_of(sk, struct tipc_sock, sk); | |
229 | } | |
230 | ||
231 | static int tsk_conn_cong(struct tipc_sock *tsk) | |
232 | { | |
233 | return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN; | |
234 | } | |
235 | ||
0c3141e9 | 236 | /** |
2e84c60b | 237 | * tsk_advance_rx_queue - discard first buffer in socket receive queue |
0c3141e9 AS |
238 | * |
239 | * Caller must hold socket lock | |
b97bf3fd | 240 | */ |
2e84c60b | 241 | static void tsk_advance_rx_queue(struct sock *sk) |
b97bf3fd | 242 | { |
5f6d9123 | 243 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
244 | } |
245 | ||
b97bf3fd | 246 | /** |
2e84c60b | 247 | * tsk_rej_rx_queue - reject all buffers in socket receive queue |
0c3141e9 AS |
248 | * |
249 | * Caller must hold socket lock | |
b97bf3fd | 250 | */ |
2e84c60b | 251 | static void tsk_rej_rx_queue(struct sock *sk) |
b97bf3fd | 252 | { |
a6ca1094 | 253 | struct sk_buff *skb; |
8db1bae3 | 254 | u32 dnode; |
c5898636 | 255 | u32 own_node = tsk_own_node(tipc_sk(sk)); |
0c3141e9 | 256 | |
a6ca1094 | 257 | while ((skb = __skb_dequeue(&sk->sk_receive_queue))) { |
c5898636 JPM |
258 | if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_ERR_NO_PORT)) |
259 | tipc_link_xmit_skb(sock_net(sk), skb, dnode, 0); | |
8db1bae3 | 260 | } |
b97bf3fd PL |
261 | } |
262 | ||
2e84c60b | 263 | /* tsk_peer_msg - verify if message was sent by connected port's peer |
0fc87aae JPM |
264 | * |
265 | * Handles cases where the node's network address has changed from | |
266 | * the default of <0.0.0> to its configured setting. | |
267 | */ | |
2e84c60b | 268 | static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg) |
0fc87aae | 269 | { |
34747539 | 270 | struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id); |
301bae56 | 271 | u32 peer_port = tsk_peer_port(tsk); |
0fc87aae JPM |
272 | u32 orig_node; |
273 | u32 peer_node; | |
274 | ||
301bae56 | 275 | if (unlikely(!tsk->connected)) |
0fc87aae JPM |
276 | return false; |
277 | ||
278 | if (unlikely(msg_origport(msg) != peer_port)) | |
279 | return false; | |
280 | ||
281 | orig_node = msg_orignode(msg); | |
301bae56 | 282 | peer_node = tsk_peer_node(tsk); |
0fc87aae JPM |
283 | |
284 | if (likely(orig_node == peer_node)) | |
285 | return true; | |
286 | ||
34747539 | 287 | if (!orig_node && (peer_node == tn->own_addr)) |
0fc87aae JPM |
288 | return true; |
289 | ||
34747539 | 290 | if (!peer_node && (orig_node == tn->own_addr)) |
0fc87aae JPM |
291 | return true; |
292 | ||
293 | return false; | |
294 | } | |
295 | ||
b97bf3fd | 296 | /** |
c5fa7b3c | 297 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 298 | * @net: network namespace (must be default network) |
b97bf3fd PL |
299 | * @sock: pre-allocated socket structure |
300 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 301 | * @kern: caused by kernel or by userspace? |
c4307285 | 302 | * |
0c3141e9 AS |
303 | * This routine creates additional data structures used by the TIPC socket, |
304 | * initializes them, and links them together. | |
b97bf3fd PL |
305 | * |
306 | * Returns 0 on success, errno otherwise | |
307 | */ | |
58ed9442 JPM |
308 | static int tipc_sk_create(struct net *net, struct socket *sock, |
309 | int protocol, int kern) | |
b97bf3fd | 310 | { |
c5898636 | 311 | struct tipc_net *tn; |
0c3141e9 AS |
312 | const struct proto_ops *ops; |
313 | socket_state state; | |
b97bf3fd | 314 | struct sock *sk; |
58ed9442 | 315 | struct tipc_sock *tsk; |
5b8fa7ce | 316 | struct tipc_msg *msg; |
0c3141e9 AS |
317 | |
318 | /* Validate arguments */ | |
b97bf3fd PL |
319 | if (unlikely(protocol != 0)) |
320 | return -EPROTONOSUPPORT; | |
321 | ||
b97bf3fd PL |
322 | switch (sock->type) { |
323 | case SOCK_STREAM: | |
0c3141e9 AS |
324 | ops = &stream_ops; |
325 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
326 | break; |
327 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
328 | ops = &packet_ops; |
329 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
330 | break; |
331 | case SOCK_DGRAM: | |
b97bf3fd | 332 | case SOCK_RDM: |
0c3141e9 AS |
333 | ops = &msg_ops; |
334 | state = SS_READY; | |
b97bf3fd | 335 | break; |
49978651 | 336 | default: |
49978651 | 337 | return -EPROTOTYPE; |
b97bf3fd PL |
338 | } |
339 | ||
0c3141e9 | 340 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
341 | if (!kern) |
342 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
343 | else | |
344 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
345 | ||
0c3141e9 | 346 | if (sk == NULL) |
b97bf3fd | 347 | return -ENOMEM; |
b97bf3fd | 348 | |
58ed9442 | 349 | tsk = tipc_sk(sk); |
301bae56 | 350 | tsk->max_pkt = MAX_PKT_DEFAULT; |
301bae56 JPM |
351 | INIT_LIST_HEAD(&tsk->publications); |
352 | msg = &tsk->phdr; | |
c5898636 JPM |
353 | tn = net_generic(sock_net(sk), tipc_net_id); |
354 | tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG, | |
5b8fa7ce | 355 | NAMED_H_SIZE, 0); |
b97bf3fd | 356 | |
0c3141e9 | 357 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
358 | sock->ops = ops; |
359 | sock->state = state; | |
0c3141e9 | 360 | sock_init_data(sock, sk); |
07f6c4bc YX |
361 | if (tipc_sk_insert(tsk)) { |
362 | pr_warn("Socket create failed; port numbrer exhausted\n"); | |
363 | return -EINVAL; | |
364 | } | |
365 | msg_set_origport(msg, tsk->portid); | |
3721e9c7 | 366 | setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk); |
4f4482dc | 367 | sk->sk_backlog_rcv = tipc_backlog_rcv; |
cc79dd1b | 368 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
369 | sk->sk_data_ready = tipc_data_ready; |
370 | sk->sk_write_space = tipc_write_space; | |
4f4482dc | 371 | tsk->conn_timeout = CONN_TIMEOUT_DEFAULT; |
60120526 | 372 | tsk->sent_unacked = 0; |
4f4482dc | 373 | atomic_set(&tsk->dupl_rcvcnt, 0); |
7ef43eba | 374 | |
0c3141e9 | 375 | if (sock->state == SS_READY) { |
301bae56 | 376 | tsk_set_unreturnable(tsk, true); |
0c3141e9 | 377 | if (sock->type == SOCK_DGRAM) |
301bae56 | 378 | tsk_set_unreliable(tsk, true); |
0c3141e9 | 379 | } |
b97bf3fd PL |
380 | return 0; |
381 | } | |
382 | ||
c5fa7b3c YX |
383 | /** |
384 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
385 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
386 | * | |
387 | * We cannot use sock_creat_kern here because it bumps module user count. | |
388 | * Since socket owner and creator is the same module we must make sure | |
389 | * that module count remains zero for module local sockets, otherwise | |
390 | * we cannot do rmmod. | |
391 | * | |
392 | * Returns 0 on success, errno otherwise | |
393 | */ | |
a62fbcce | 394 | int tipc_sock_create_local(struct net *net, int type, struct socket **res) |
c5fa7b3c YX |
395 | { |
396 | int rc; | |
c5fa7b3c YX |
397 | |
398 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
399 | if (rc < 0) { | |
400 | pr_err("Failed to create kernel socket\n"); | |
401 | return rc; | |
402 | } | |
a62fbcce | 403 | tipc_sk_create(net, *res, 0, 1); |
c5fa7b3c | 404 | |
c5fa7b3c YX |
405 | return 0; |
406 | } | |
407 | ||
408 | /** | |
409 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
410 | * @sock: the socket to be released. | |
411 | * | |
412 | * Module reference count is not incremented when such sockets are created, | |
413 | * so we must keep it from being decremented when they are released. | |
414 | */ | |
415 | void tipc_sock_release_local(struct socket *sock) | |
416 | { | |
247f0f3c | 417 | tipc_release(sock); |
c5fa7b3c YX |
418 | sock->ops = NULL; |
419 | sock_release(sock); | |
420 | } | |
421 | ||
422 | /** | |
423 | * tipc_sock_accept_local - accept a connection on a socket created | |
424 | * with tipc_sock_create_local. Use this function to avoid that | |
425 | * module reference count is inadvertently incremented. | |
426 | * | |
427 | * @sock: the accepting socket | |
428 | * @newsock: reference to the new socket to be created | |
429 | * @flags: socket flags | |
430 | */ | |
431 | ||
432 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 433 | int flags) |
c5fa7b3c YX |
434 | { |
435 | struct sock *sk = sock->sk; | |
436 | int ret; | |
437 | ||
438 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
439 | sk->sk_protocol, newsock); | |
440 | if (ret < 0) | |
441 | return ret; | |
442 | ||
247f0f3c | 443 | ret = tipc_accept(sock, *newsock, flags); |
c5fa7b3c YX |
444 | if (ret < 0) { |
445 | sock_release(*newsock); | |
446 | return ret; | |
447 | } | |
448 | (*newsock)->ops = sock->ops; | |
449 | return ret; | |
450 | } | |
451 | ||
07f6c4bc YX |
452 | static void tipc_sk_callback(struct rcu_head *head) |
453 | { | |
454 | struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu); | |
455 | ||
456 | sock_put(&tsk->sk); | |
457 | } | |
458 | ||
b97bf3fd | 459 | /** |
247f0f3c | 460 | * tipc_release - destroy a TIPC socket |
b97bf3fd PL |
461 | * @sock: socket to destroy |
462 | * | |
463 | * This routine cleans up any messages that are still queued on the socket. | |
464 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
465 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
466 | * and any others are discarded. (If the first message on a STREAM socket | |
467 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 468 | * |
b97bf3fd PL |
469 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
470 | * are returned or discarded according to the "destination droppable" setting | |
471 | * specified for the message by the sender. | |
472 | * | |
473 | * Returns 0 on success, errno otherwise | |
474 | */ | |
247f0f3c | 475 | static int tipc_release(struct socket *sock) |
b97bf3fd | 476 | { |
b97bf3fd | 477 | struct sock *sk = sock->sk; |
357c4774 | 478 | struct net *net; |
58ed9442 | 479 | struct tipc_sock *tsk; |
a6ca1094 | 480 | struct sk_buff *skb; |
f2f2a96a | 481 | u32 dnode, probing_state; |
b97bf3fd | 482 | |
0c3141e9 AS |
483 | /* |
484 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
485 | * releases a pre-allocated child socket that was never used) | |
486 | */ | |
0c3141e9 | 487 | if (sk == NULL) |
b97bf3fd | 488 | return 0; |
c4307285 | 489 | |
357c4774 | 490 | net = sock_net(sk); |
58ed9442 | 491 | tsk = tipc_sk(sk); |
0c3141e9 AS |
492 | lock_sock(sk); |
493 | ||
494 | /* | |
495 | * Reject all unreceived messages, except on an active connection | |
496 | * (which disconnects locally & sends a 'FIN+' to peer) | |
497 | */ | |
301bae56 | 498 | dnode = tsk_peer_node(tsk); |
b97bf3fd | 499 | while (sock->state != SS_DISCONNECTING) { |
a6ca1094 YX |
500 | skb = __skb_dequeue(&sk->sk_receive_queue); |
501 | if (skb == NULL) | |
b97bf3fd | 502 | break; |
a6ca1094 YX |
503 | if (TIPC_SKB_CB(skb)->handle != NULL) |
504 | kfree_skb(skb); | |
0c3141e9 AS |
505 | else { |
506 | if ((sock->state == SS_CONNECTING) || | |
507 | (sock->state == SS_CONNECTED)) { | |
508 | sock->state = SS_DISCONNECTING; | |
301bae56 | 509 | tsk->connected = 0; |
f2f9800d | 510 | tipc_node_remove_conn(net, dnode, tsk->portid); |
0c3141e9 | 511 | } |
c5898636 | 512 | if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, |
34747539 | 513 | TIPC_ERR_NO_PORT)) |
f2f9800d | 514 | tipc_link_xmit_skb(net, skb, dnode, 0); |
0c3141e9 | 515 | } |
b97bf3fd PL |
516 | } |
517 | ||
301bae56 | 518 | tipc_sk_withdraw(tsk, 0, NULL); |
f2f2a96a | 519 | probing_state = tsk->probing_state; |
3721e9c7 YX |
520 | if (del_timer_sync(&sk->sk_timer) && |
521 | probing_state != TIPC_CONN_PROBING) | |
f2f2a96a | 522 | sock_put(sk); |
07f6c4bc | 523 | tipc_sk_remove(tsk); |
301bae56 | 524 | if (tsk->connected) { |
c5898636 | 525 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
34747539 | 526 | TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode, |
c5898636 | 527 | tsk_own_node(tsk), tsk_peer_port(tsk), |
07f6c4bc | 528 | tsk->portid, TIPC_ERR_NO_PORT); |
a6ca1094 | 529 | if (skb) |
f2f9800d YX |
530 | tipc_link_xmit_skb(net, skb, dnode, tsk->portid); |
531 | tipc_node_remove_conn(net, dnode, tsk->portid); | |
5b8fa7ce | 532 | } |
b97bf3fd | 533 | |
0c3141e9 | 534 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 535 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 536 | |
0c3141e9 | 537 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
538 | sock->state = SS_DISCONNECTING; |
539 | release_sock(sk); | |
07f6c4bc YX |
540 | |
541 | call_rcu(&tsk->rcu, tipc_sk_callback); | |
0c3141e9 | 542 | sock->sk = NULL; |
b97bf3fd | 543 | |
065d7e39 | 544 | return 0; |
b97bf3fd PL |
545 | } |
546 | ||
547 | /** | |
247f0f3c | 548 | * tipc_bind - associate or disassocate TIPC name(s) with a socket |
b97bf3fd PL |
549 | * @sock: socket structure |
550 | * @uaddr: socket address describing name(s) and desired operation | |
551 | * @uaddr_len: size of socket address data structure | |
c4307285 | 552 | * |
b97bf3fd PL |
553 | * Name and name sequence binding is indicated using a positive scope value; |
554 | * a negative scope value unbinds the specified name. Specifying no name | |
555 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 556 | * |
b97bf3fd | 557 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
558 | * |
559 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
560 | * access any non-constant socket information. | |
b97bf3fd | 561 | */ |
247f0f3c YX |
562 | static int tipc_bind(struct socket *sock, struct sockaddr *uaddr, |
563 | int uaddr_len) | |
b97bf3fd | 564 | { |
84602761 | 565 | struct sock *sk = sock->sk; |
b97bf3fd | 566 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 567 | struct tipc_sock *tsk = tipc_sk(sk); |
84602761 | 568 | int res = -EINVAL; |
b97bf3fd | 569 | |
84602761 YX |
570 | lock_sock(sk); |
571 | if (unlikely(!uaddr_len)) { | |
301bae56 | 572 | res = tipc_sk_withdraw(tsk, 0, NULL); |
84602761 YX |
573 | goto exit; |
574 | } | |
c4307285 | 575 | |
84602761 YX |
576 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
577 | res = -EINVAL; | |
578 | goto exit; | |
579 | } | |
580 | if (addr->family != AF_TIPC) { | |
581 | res = -EAFNOSUPPORT; | |
582 | goto exit; | |
583 | } | |
b97bf3fd | 584 | |
b97bf3fd PL |
585 | if (addr->addrtype == TIPC_ADDR_NAME) |
586 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
587 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
588 | res = -EAFNOSUPPORT; | |
589 | goto exit; | |
590 | } | |
c4307285 | 591 | |
13a2e898 | 592 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 593 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
594 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
595 | res = -EACCES; | |
596 | goto exit; | |
597 | } | |
c422f1bd | 598 | |
84602761 | 599 | res = (addr->scope > 0) ? |
301bae56 JPM |
600 | tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) : |
601 | tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq); | |
84602761 YX |
602 | exit: |
603 | release_sock(sk); | |
604 | return res; | |
b97bf3fd PL |
605 | } |
606 | ||
c4307285 | 607 | /** |
247f0f3c | 608 | * tipc_getname - get port ID of socket or peer socket |
b97bf3fd PL |
609 | * @sock: socket structure |
610 | * @uaddr: area for returned socket address | |
611 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 612 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 613 | * |
b97bf3fd | 614 | * Returns 0 on success, errno otherwise |
0c3141e9 | 615 | * |
2da59918 AS |
616 | * NOTE: This routine doesn't need to take the socket lock since it only |
617 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 618 | * a completely predictable manner). |
b97bf3fd | 619 | */ |
247f0f3c YX |
620 | static int tipc_getname(struct socket *sock, struct sockaddr *uaddr, |
621 | int *uaddr_len, int peer) | |
b97bf3fd | 622 | { |
b97bf3fd | 623 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
58ed9442 | 624 | struct tipc_sock *tsk = tipc_sk(sock->sk); |
34747539 | 625 | struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id); |
b97bf3fd | 626 | |
88f8a5e3 | 627 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 628 | if (peer) { |
2da59918 AS |
629 | if ((sock->state != SS_CONNECTED) && |
630 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
631 | return -ENOTCONN; | |
301bae56 JPM |
632 | addr->addr.id.ref = tsk_peer_port(tsk); |
633 | addr->addr.id.node = tsk_peer_node(tsk); | |
0c3141e9 | 634 | } else { |
07f6c4bc | 635 | addr->addr.id.ref = tsk->portid; |
34747539 | 636 | addr->addr.id.node = tn->own_addr; |
0c3141e9 | 637 | } |
b97bf3fd PL |
638 | |
639 | *uaddr_len = sizeof(*addr); | |
640 | addr->addrtype = TIPC_ADDR_ID; | |
641 | addr->family = AF_TIPC; | |
642 | addr->scope = 0; | |
b97bf3fd PL |
643 | addr->addr.name.domain = 0; |
644 | ||
0c3141e9 | 645 | return 0; |
b97bf3fd PL |
646 | } |
647 | ||
648 | /** | |
247f0f3c | 649 | * tipc_poll - read and possibly block on pollmask |
b97bf3fd PL |
650 | * @file: file structure associated with the socket |
651 | * @sock: socket for which to calculate the poll bits | |
652 | * @wait: ??? | |
653 | * | |
9b674e82 AS |
654 | * Returns pollmask value |
655 | * | |
656 | * COMMENTARY: | |
657 | * It appears that the usual socket locking mechanisms are not useful here | |
658 | * since the pollmask info is potentially out-of-date the moment this routine | |
659 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
660 | * to handle any preventable race conditions, so TIPC will do the same ... | |
661 | * | |
662 | * TIPC sets the returned events as follows: | |
f662c070 AS |
663 | * |
664 | * socket state flags set | |
665 | * ------------ --------- | |
666 | * unconnected no read flags | |
c4fc298a | 667 | * POLLOUT if port is not congested |
f662c070 AS |
668 | * |
669 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
670 | * no write flags | |
671 | * | |
672 | * connected POLLIN/POLLRDNORM if data in rx queue | |
673 | * POLLOUT if port is not congested | |
674 | * | |
675 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
676 | * no write flags | |
677 | * | |
678 | * listening POLLIN if SYN in rx queue | |
679 | * no write flags | |
680 | * | |
681 | * ready POLLIN/POLLRDNORM if data in rx queue | |
682 | * [connectionless] POLLOUT (since port cannot be congested) | |
683 | * | |
684 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
685 | * imply that the operation will succeed, merely that it should be performed | |
686 | * and will not block. | |
b97bf3fd | 687 | */ |
247f0f3c YX |
688 | static unsigned int tipc_poll(struct file *file, struct socket *sock, |
689 | poll_table *wait) | |
b97bf3fd | 690 | { |
9b674e82 | 691 | struct sock *sk = sock->sk; |
58ed9442 | 692 | struct tipc_sock *tsk = tipc_sk(sk); |
f662c070 | 693 | u32 mask = 0; |
9b674e82 | 694 | |
f288bef4 | 695 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 696 | |
f662c070 | 697 | switch ((int)sock->state) { |
c4fc298a | 698 | case SS_UNCONNECTED: |
60120526 | 699 | if (!tsk->link_cong) |
c4fc298a EH |
700 | mask |= POLLOUT; |
701 | break; | |
f662c070 AS |
702 | case SS_READY: |
703 | case SS_CONNECTED: | |
301bae56 | 704 | if (!tsk->link_cong && !tsk_conn_cong(tsk)) |
f662c070 AS |
705 | mask |= POLLOUT; |
706 | /* fall thru' */ | |
707 | case SS_CONNECTING: | |
708 | case SS_LISTENING: | |
709 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
710 | mask |= (POLLIN | POLLRDNORM); | |
711 | break; | |
712 | case SS_DISCONNECTING: | |
713 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
714 | break; | |
715 | } | |
9b674e82 AS |
716 | |
717 | return mask; | |
b97bf3fd PL |
718 | } |
719 | ||
0abd8ff2 JPM |
720 | /** |
721 | * tipc_sendmcast - send multicast message | |
722 | * @sock: socket structure | |
723 | * @seq: destination address | |
562640f3 | 724 | * @msg: message to send |
0abd8ff2 JPM |
725 | * @dsz: total length of message data |
726 | * @timeo: timeout to wait for wakeup | |
727 | * | |
728 | * Called from function tipc_sendmsg(), which has done all sanity checks | |
729 | * Returns the number of bytes sent on success, or errno | |
730 | */ | |
731 | static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq, | |
562640f3 | 732 | struct msghdr *msg, size_t dsz, long timeo) |
0abd8ff2 JPM |
733 | { |
734 | struct sock *sk = sock->sk; | |
c5898636 | 735 | struct tipc_sock *tsk = tipc_sk(sk); |
f2f9800d | 736 | struct net *net = sock_net(sk); |
c5898636 | 737 | struct tipc_msg *mhdr = &tsk->phdr; |
94153e36 | 738 | struct sk_buff_head *pktchain = &sk->sk_write_queue; |
f25dcc76 | 739 | struct iov_iter save = msg->msg_iter; |
0abd8ff2 JPM |
740 | uint mtu; |
741 | int rc; | |
742 | ||
743 | msg_set_type(mhdr, TIPC_MCAST_MSG); | |
744 | msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE); | |
745 | msg_set_destport(mhdr, 0); | |
746 | msg_set_destnode(mhdr, 0); | |
747 | msg_set_nametype(mhdr, seq->type); | |
748 | msg_set_namelower(mhdr, seq->lower); | |
749 | msg_set_nameupper(mhdr, seq->upper); | |
750 | msg_set_hdr_sz(mhdr, MCAST_H_SIZE); | |
751 | ||
752 | new_mtu: | |
753 | mtu = tipc_bclink_get_mtu(); | |
94153e36 | 754 | rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, pktchain); |
0abd8ff2 JPM |
755 | if (unlikely(rc < 0)) |
756 | return rc; | |
757 | ||
758 | do { | |
94153e36 | 759 | rc = tipc_bclink_xmit(net, pktchain); |
0abd8ff2 JPM |
760 | if (likely(rc >= 0)) { |
761 | rc = dsz; | |
762 | break; | |
763 | } | |
f25dcc76 AV |
764 | if (rc == -EMSGSIZE) { |
765 | msg->msg_iter = save; | |
0abd8ff2 | 766 | goto new_mtu; |
f25dcc76 | 767 | } |
0abd8ff2 JPM |
768 | if (rc != -ELINKCONG) |
769 | break; | |
50100a5e | 770 | tipc_sk(sk)->link_cong = 1; |
0abd8ff2 JPM |
771 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
772 | if (rc) | |
94153e36 | 773 | __skb_queue_purge(pktchain); |
0abd8ff2 JPM |
774 | } while (!rc); |
775 | return rc; | |
776 | } | |
777 | ||
cb1b7280 JPM |
778 | /** |
779 | * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets | |
780 | * @arrvq: queue with arriving messages, to be cloned after destination lookup | |
781 | * @inputq: queue with cloned messages, delivered to socket after dest lookup | |
782 | * | |
783 | * Multi-threaded: parallel calls with reference to same queues may occur | |
078bec82 | 784 | */ |
cb1b7280 JPM |
785 | void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq, |
786 | struct sk_buff_head *inputq) | |
078bec82 | 787 | { |
cb1b7280 | 788 | struct tipc_msg *msg; |
3c724acd | 789 | struct tipc_plist dports; |
3c724acd | 790 | u32 portid; |
078bec82 | 791 | u32 scope = TIPC_CLUSTER_SCOPE; |
cb1b7280 JPM |
792 | struct sk_buff_head tmpq; |
793 | uint hsz; | |
794 | struct sk_buff *skb, *_skb; | |
3c724acd | 795 | |
cb1b7280 | 796 | __skb_queue_head_init(&tmpq); |
3c724acd | 797 | tipc_plist_init(&dports); |
078bec82 | 798 | |
cb1b7280 JPM |
799 | skb = tipc_skb_peek(arrvq, &inputq->lock); |
800 | for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) { | |
801 | msg = buf_msg(skb); | |
802 | hsz = skb_headroom(skb) + msg_hdr_sz(msg); | |
803 | ||
804 | if (in_own_node(net, msg_orignode(msg))) | |
805 | scope = TIPC_NODE_SCOPE; | |
806 | ||
807 | /* Create destination port list and message clones: */ | |
808 | tipc_nametbl_mc_translate(net, | |
809 | msg_nametype(msg), msg_namelower(msg), | |
810 | msg_nameupper(msg), scope, &dports); | |
811 | portid = tipc_plist_pop(&dports); | |
812 | for (; portid; portid = tipc_plist_pop(&dports)) { | |
813 | _skb = __pskb_copy(skb, hsz, GFP_ATOMIC); | |
814 | if (_skb) { | |
815 | msg_set_destport(buf_msg(_skb), portid); | |
816 | __skb_queue_tail(&tmpq, _skb); | |
817 | continue; | |
818 | } | |
819 | pr_warn("Failed to clone mcast rcv buffer\n"); | |
078bec82 | 820 | } |
cb1b7280 JPM |
821 | /* Append to inputq if not already done by other thread */ |
822 | spin_lock_bh(&inputq->lock); | |
823 | if (skb_peek(arrvq) == skb) { | |
824 | skb_queue_splice_tail_init(&tmpq, inputq); | |
825 | kfree_skb(__skb_dequeue(arrvq)); | |
826 | } | |
827 | spin_unlock_bh(&inputq->lock); | |
828 | __skb_queue_purge(&tmpq); | |
829 | kfree_skb(skb); | |
078bec82 | 830 | } |
cb1b7280 | 831 | tipc_sk_rcv(net, inputq); |
078bec82 JPM |
832 | } |
833 | ||
ac0074ee JPM |
834 | /** |
835 | * tipc_sk_proto_rcv - receive a connection mng protocol message | |
836 | * @tsk: receiving socket | |
1186adf7 | 837 | * @skb: pointer to message buffer. Set to NULL if buffer is consumed. |
ac0074ee | 838 | */ |
1186adf7 | 839 | static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff **skb) |
ac0074ee | 840 | { |
1186adf7 | 841 | struct tipc_msg *msg = buf_msg(*skb); |
60120526 | 842 | int conn_cong; |
1186adf7 JPM |
843 | u32 dnode; |
844 | u32 own_node = tsk_own_node(tsk); | |
ac0074ee | 845 | /* Ignore if connection cannot be validated: */ |
2e84c60b | 846 | if (!tsk_peer_msg(tsk, msg)) |
ac0074ee JPM |
847 | goto exit; |
848 | ||
301bae56 | 849 | tsk->probing_state = TIPC_CONN_OK; |
ac0074ee JPM |
850 | |
851 | if (msg_type(msg) == CONN_ACK) { | |
301bae56 | 852 | conn_cong = tsk_conn_cong(tsk); |
60120526 JPM |
853 | tsk->sent_unacked -= msg_msgcnt(msg); |
854 | if (conn_cong) | |
50100a5e | 855 | tsk->sk.sk_write_space(&tsk->sk); |
ac0074ee | 856 | } else if (msg_type(msg) == CONN_PROBE) { |
1186adf7 JPM |
857 | if (tipc_msg_reverse(own_node, *skb, &dnode, TIPC_OK)) { |
858 | msg_set_type(msg, CONN_PROBE_REPLY); | |
859 | return; | |
860 | } | |
ac0074ee JPM |
861 | } |
862 | /* Do nothing if msg_type() == CONN_PROBE_REPLY */ | |
863 | exit: | |
1186adf7 JPM |
864 | kfree_skb(*skb); |
865 | *skb = NULL; | |
ac0074ee JPM |
866 | } |
867 | ||
3f40504f YX |
868 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
869 | { | |
870 | struct sock *sk = sock->sk; | |
58ed9442 | 871 | struct tipc_sock *tsk = tipc_sk(sk); |
3f40504f YX |
872 | DEFINE_WAIT(wait); |
873 | int done; | |
874 | ||
875 | do { | |
876 | int err = sock_error(sk); | |
877 | if (err) | |
878 | return err; | |
879 | if (sock->state == SS_DISCONNECTING) | |
880 | return -EPIPE; | |
881 | if (!*timeo_p) | |
882 | return -EAGAIN; | |
883 | if (signal_pending(current)) | |
884 | return sock_intr_errno(*timeo_p); | |
885 | ||
886 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
60120526 | 887 | done = sk_wait_event(sk, timeo_p, !tsk->link_cong); |
3f40504f YX |
888 | finish_wait(sk_sleep(sk), &wait); |
889 | } while (!done); | |
890 | return 0; | |
891 | } | |
892 | ||
b97bf3fd | 893 | /** |
247f0f3c | 894 | * tipc_sendmsg - send message in connectionless manner |
0c3141e9 | 895 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
896 | * @sock: socket structure |
897 | * @m: message to send | |
e2dafe87 | 898 | * @dsz: amount of user data to be sent |
c4307285 | 899 | * |
b97bf3fd | 900 | * Message must have an destination specified explicitly. |
c4307285 | 901 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
902 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
903 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 904 | * |
b97bf3fd PL |
905 | * Returns the number of bytes sent on success, or errno otherwise |
906 | */ | |
247f0f3c | 907 | static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock, |
e2dafe87 | 908 | struct msghdr *m, size_t dsz) |
b97bf3fd | 909 | { |
e2dafe87 | 910 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
0c3141e9 | 911 | struct sock *sk = sock->sk; |
58ed9442 | 912 | struct tipc_sock *tsk = tipc_sk(sk); |
f2f9800d | 913 | struct net *net = sock_net(sk); |
301bae56 | 914 | struct tipc_msg *mhdr = &tsk->phdr; |
e2dafe87 | 915 | u32 dnode, dport; |
94153e36 | 916 | struct sk_buff_head *pktchain = &sk->sk_write_queue; |
a6ca1094 | 917 | struct sk_buff *skb; |
e2dafe87 | 918 | struct tipc_name_seq *seq = &dest->addr.nameseq; |
f25dcc76 | 919 | struct iov_iter save; |
e2dafe87 | 920 | u32 mtu; |
3f40504f | 921 | long timeo; |
88b17b6a | 922 | int rc; |
b97bf3fd PL |
923 | |
924 | if (unlikely(!dest)) | |
925 | return -EDESTADDRREQ; | |
e2dafe87 | 926 | |
51f9cc1f AS |
927 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
928 | (dest->family != AF_TIPC))) | |
b97bf3fd | 929 | return -EINVAL; |
e2dafe87 JPM |
930 | |
931 | if (dsz > TIPC_MAX_USER_MSG_SIZE) | |
c29c3f70 | 932 | return -EMSGSIZE; |
b97bf3fd | 933 | |
0c3141e9 AS |
934 | if (iocb) |
935 | lock_sock(sk); | |
936 | ||
e2dafe87 | 937 | if (unlikely(sock->state != SS_READY)) { |
0c3141e9 | 938 | if (sock->state == SS_LISTENING) { |
e2dafe87 | 939 | rc = -EPIPE; |
0c3141e9 AS |
940 | goto exit; |
941 | } | |
942 | if (sock->state != SS_UNCONNECTED) { | |
e2dafe87 | 943 | rc = -EISCONN; |
0c3141e9 AS |
944 | goto exit; |
945 | } | |
301bae56 | 946 | if (tsk->published) { |
e2dafe87 | 947 | rc = -EOPNOTSUPP; |
0c3141e9 AS |
948 | goto exit; |
949 | } | |
3388007b | 950 | if (dest->addrtype == TIPC_ADDR_NAME) { |
301bae56 JPM |
951 | tsk->conn_type = dest->addr.name.name.type; |
952 | tsk->conn_instance = dest->addr.name.name.instance; | |
3388007b | 953 | } |
b97bf3fd PL |
954 | } |
955 | ||
3f40504f | 956 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
e2dafe87 JPM |
957 | |
958 | if (dest->addrtype == TIPC_ADDR_MCAST) { | |
562640f3 | 959 | rc = tipc_sendmcast(sock, seq, m, dsz, timeo); |
e2dafe87 JPM |
960 | goto exit; |
961 | } else if (dest->addrtype == TIPC_ADDR_NAME) { | |
962 | u32 type = dest->addr.name.name.type; | |
963 | u32 inst = dest->addr.name.name.instance; | |
964 | u32 domain = dest->addr.name.domain; | |
965 | ||
966 | dnode = domain; | |
967 | msg_set_type(mhdr, TIPC_NAMED_MSG); | |
968 | msg_set_hdr_sz(mhdr, NAMED_H_SIZE); | |
969 | msg_set_nametype(mhdr, type); | |
970 | msg_set_nameinst(mhdr, inst); | |
971 | msg_set_lookup_scope(mhdr, tipc_addr_scope(domain)); | |
4ac1c8d0 | 972 | dport = tipc_nametbl_translate(net, type, inst, &dnode); |
e2dafe87 JPM |
973 | msg_set_destnode(mhdr, dnode); |
974 | msg_set_destport(mhdr, dport); | |
975 | if (unlikely(!dport && !dnode)) { | |
976 | rc = -EHOSTUNREACH; | |
977 | goto exit; | |
c4307285 | 978 | } |
e2dafe87 JPM |
979 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
980 | dnode = dest->addr.id.node; | |
981 | msg_set_type(mhdr, TIPC_DIRECT_MSG); | |
982 | msg_set_lookup_scope(mhdr, 0); | |
983 | msg_set_destnode(mhdr, dnode); | |
984 | msg_set_destport(mhdr, dest->addr.id.ref); | |
985 | msg_set_hdr_sz(mhdr, BASIC_H_SIZE); | |
986 | } | |
987 | ||
f25dcc76 | 988 | save = m->msg_iter; |
e2dafe87 | 989 | new_mtu: |
f2f9800d | 990 | mtu = tipc_node_get_mtu(net, dnode, tsk->portid); |
94153e36 | 991 | rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, pktchain); |
e2dafe87 JPM |
992 | if (rc < 0) |
993 | goto exit; | |
994 | ||
995 | do { | |
94153e36 | 996 | skb = skb_peek(pktchain); |
a6ca1094 | 997 | TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong; |
94153e36 | 998 | rc = tipc_link_xmit(net, pktchain, dnode, tsk->portid); |
e2dafe87 JPM |
999 | if (likely(rc >= 0)) { |
1000 | if (sock->state != SS_READY) | |
0c3141e9 | 1001 | sock->state = SS_CONNECTING; |
e2dafe87 | 1002 | rc = dsz; |
0c3141e9 | 1003 | break; |
c4307285 | 1004 | } |
f25dcc76 AV |
1005 | if (rc == -EMSGSIZE) { |
1006 | m->msg_iter = save; | |
e2dafe87 | 1007 | goto new_mtu; |
f25dcc76 | 1008 | } |
e2dafe87 | 1009 | if (rc != -ELINKCONG) |
0c3141e9 | 1010 | break; |
50100a5e | 1011 | tsk->link_cong = 1; |
e2dafe87 | 1012 | rc = tipc_wait_for_sndmsg(sock, &timeo); |
70452dcb | 1013 | if (rc) |
94153e36 | 1014 | __skb_queue_purge(pktchain); |
e2dafe87 | 1015 | } while (!rc); |
0c3141e9 AS |
1016 | exit: |
1017 | if (iocb) | |
1018 | release_sock(sk); | |
e2dafe87 JPM |
1019 | |
1020 | return rc; | |
b97bf3fd PL |
1021 | } |
1022 | ||
391a6dd1 YX |
1023 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
1024 | { | |
1025 | struct sock *sk = sock->sk; | |
58ed9442 | 1026 | struct tipc_sock *tsk = tipc_sk(sk); |
391a6dd1 YX |
1027 | DEFINE_WAIT(wait); |
1028 | int done; | |
1029 | ||
1030 | do { | |
1031 | int err = sock_error(sk); | |
1032 | if (err) | |
1033 | return err; | |
1034 | if (sock->state == SS_DISCONNECTING) | |
1035 | return -EPIPE; | |
1036 | else if (sock->state != SS_CONNECTED) | |
1037 | return -ENOTCONN; | |
1038 | if (!*timeo_p) | |
1039 | return -EAGAIN; | |
1040 | if (signal_pending(current)) | |
1041 | return sock_intr_errno(*timeo_p); | |
1042 | ||
1043 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1044 | done = sk_wait_event(sk, timeo_p, | |
60120526 | 1045 | (!tsk->link_cong && |
301bae56 JPM |
1046 | !tsk_conn_cong(tsk)) || |
1047 | !tsk->connected); | |
391a6dd1 YX |
1048 | finish_wait(sk_sleep(sk), &wait); |
1049 | } while (!done); | |
1050 | return 0; | |
1051 | } | |
1052 | ||
c4307285 | 1053 | /** |
4ccfe5e0 JPM |
1054 | * tipc_send_stream - send stream-oriented data |
1055 | * @iocb: (unused) | |
b97bf3fd | 1056 | * @sock: socket structure |
4ccfe5e0 JPM |
1057 | * @m: data to send |
1058 | * @dsz: total length of data to be transmitted | |
c4307285 | 1059 | * |
4ccfe5e0 | 1060 | * Used for SOCK_STREAM data. |
c4307285 | 1061 | * |
4ccfe5e0 JPM |
1062 | * Returns the number of bytes sent on success (or partial success), |
1063 | * or errno if no data sent | |
b97bf3fd | 1064 | */ |
4ccfe5e0 JPM |
1065 | static int tipc_send_stream(struct kiocb *iocb, struct socket *sock, |
1066 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 1067 | { |
0c3141e9 | 1068 | struct sock *sk = sock->sk; |
f2f9800d | 1069 | struct net *net = sock_net(sk); |
58ed9442 | 1070 | struct tipc_sock *tsk = tipc_sk(sk); |
301bae56 | 1071 | struct tipc_msg *mhdr = &tsk->phdr; |
94153e36 | 1072 | struct sk_buff_head *pktchain = &sk->sk_write_queue; |
342dfc30 | 1073 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
07f6c4bc | 1074 | u32 portid = tsk->portid; |
4ccfe5e0 | 1075 | int rc = -EINVAL; |
391a6dd1 | 1076 | long timeo; |
4ccfe5e0 JPM |
1077 | u32 dnode; |
1078 | uint mtu, send, sent = 0; | |
f25dcc76 | 1079 | struct iov_iter save; |
b97bf3fd PL |
1080 | |
1081 | /* Handle implied connection establishment */ | |
4ccfe5e0 JPM |
1082 | if (unlikely(dest)) { |
1083 | rc = tipc_sendmsg(iocb, sock, m, dsz); | |
1084 | if (dsz && (dsz == rc)) | |
60120526 | 1085 | tsk->sent_unacked = 1; |
4ccfe5e0 JPM |
1086 | return rc; |
1087 | } | |
1088 | if (dsz > (uint)INT_MAX) | |
c29c3f70 AS |
1089 | return -EMSGSIZE; |
1090 | ||
0c3141e9 AS |
1091 | if (iocb) |
1092 | lock_sock(sk); | |
b97bf3fd | 1093 | |
391a6dd1 YX |
1094 | if (unlikely(sock->state != SS_CONNECTED)) { |
1095 | if (sock->state == SS_DISCONNECTING) | |
4ccfe5e0 | 1096 | rc = -EPIPE; |
391a6dd1 | 1097 | else |
4ccfe5e0 | 1098 | rc = -ENOTCONN; |
391a6dd1 YX |
1099 | goto exit; |
1100 | } | |
1d835874 | 1101 | |
391a6dd1 | 1102 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
301bae56 | 1103 | dnode = tsk_peer_node(tsk); |
4ccfe5e0 JPM |
1104 | |
1105 | next: | |
f25dcc76 | 1106 | save = m->msg_iter; |
301bae56 | 1107 | mtu = tsk->max_pkt; |
4ccfe5e0 | 1108 | send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE); |
94153e36 | 1109 | rc = tipc_msg_build(mhdr, m, sent, send, mtu, pktchain); |
4ccfe5e0 JPM |
1110 | if (unlikely(rc < 0)) |
1111 | goto exit; | |
c4307285 | 1112 | do { |
301bae56 | 1113 | if (likely(!tsk_conn_cong(tsk))) { |
94153e36 | 1114 | rc = tipc_link_xmit(net, pktchain, dnode, portid); |
4ccfe5e0 | 1115 | if (likely(!rc)) { |
60120526 | 1116 | tsk->sent_unacked++; |
4ccfe5e0 JPM |
1117 | sent += send; |
1118 | if (sent == dsz) | |
1119 | break; | |
1120 | goto next; | |
1121 | } | |
1122 | if (rc == -EMSGSIZE) { | |
f2f9800d YX |
1123 | tsk->max_pkt = tipc_node_get_mtu(net, dnode, |
1124 | portid); | |
f25dcc76 | 1125 | m->msg_iter = save; |
4ccfe5e0 JPM |
1126 | goto next; |
1127 | } | |
1128 | if (rc != -ELINKCONG) | |
1129 | break; | |
50100a5e | 1130 | tsk->link_cong = 1; |
4ccfe5e0 JPM |
1131 | } |
1132 | rc = tipc_wait_for_sndpkt(sock, &timeo); | |
70452dcb | 1133 | if (rc) |
94153e36 | 1134 | __skb_queue_purge(pktchain); |
4ccfe5e0 | 1135 | } while (!rc); |
391a6dd1 | 1136 | exit: |
0c3141e9 AS |
1137 | if (iocb) |
1138 | release_sock(sk); | |
4ccfe5e0 | 1139 | return sent ? sent : rc; |
b97bf3fd PL |
1140 | } |
1141 | ||
c4307285 | 1142 | /** |
4ccfe5e0 JPM |
1143 | * tipc_send_packet - send a connection-oriented message |
1144 | * @iocb: if NULL, indicates that socket lock is already held | |
b97bf3fd | 1145 | * @sock: socket structure |
4ccfe5e0 JPM |
1146 | * @m: message to send |
1147 | * @dsz: length of data to be transmitted | |
c4307285 | 1148 | * |
4ccfe5e0 | 1149 | * Used for SOCK_SEQPACKET messages. |
c4307285 | 1150 | * |
4ccfe5e0 | 1151 | * Returns the number of bytes sent on success, or errno otherwise |
b97bf3fd | 1152 | */ |
4ccfe5e0 JPM |
1153 | static int tipc_send_packet(struct kiocb *iocb, struct socket *sock, |
1154 | struct msghdr *m, size_t dsz) | |
b97bf3fd | 1155 | { |
4ccfe5e0 JPM |
1156 | if (dsz > TIPC_MAX_USER_MSG_SIZE) |
1157 | return -EMSGSIZE; | |
b97bf3fd | 1158 | |
4ccfe5e0 | 1159 | return tipc_send_stream(iocb, sock, m, dsz); |
b97bf3fd PL |
1160 | } |
1161 | ||
dadebc00 | 1162 | /* tipc_sk_finish_conn - complete the setup of a connection |
b97bf3fd | 1163 | */ |
301bae56 | 1164 | static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, |
dadebc00 | 1165 | u32 peer_node) |
b97bf3fd | 1166 | { |
3721e9c7 YX |
1167 | struct sock *sk = &tsk->sk; |
1168 | struct net *net = sock_net(sk); | |
301bae56 | 1169 | struct tipc_msg *msg = &tsk->phdr; |
b97bf3fd | 1170 | |
dadebc00 JPM |
1171 | msg_set_destnode(msg, peer_node); |
1172 | msg_set_destport(msg, peer_port); | |
1173 | msg_set_type(msg, TIPC_CONN_MSG); | |
1174 | msg_set_lookup_scope(msg, 0); | |
1175 | msg_set_hdr_sz(msg, SHORT_H_SIZE); | |
584d24b3 | 1176 | |
2f55c437 | 1177 | tsk->probing_intv = CONN_PROBING_INTERVAL; |
301bae56 JPM |
1178 | tsk->probing_state = TIPC_CONN_OK; |
1179 | tsk->connected = 1; | |
3721e9c7 | 1180 | sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv); |
f2f9800d YX |
1181 | tipc_node_add_conn(net, peer_node, tsk->portid, peer_port); |
1182 | tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid); | |
b97bf3fd PL |
1183 | } |
1184 | ||
1185 | /** | |
1186 | * set_orig_addr - capture sender's address for received message | |
1187 | * @m: descriptor for message info | |
1188 | * @msg: received message header | |
c4307285 | 1189 | * |
b97bf3fd PL |
1190 | * Note: Address is not captured if not requested by receiver. |
1191 | */ | |
05790c64 | 1192 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 1193 | { |
342dfc30 | 1194 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 1195 | |
c4307285 | 1196 | if (addr) { |
b97bf3fd PL |
1197 | addr->family = AF_TIPC; |
1198 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 1199 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
1200 | addr->addr.id.ref = msg_origport(msg); |
1201 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
1202 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
1203 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
1204 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
1205 | } | |
1206 | } | |
1207 | ||
1208 | /** | |
301bae56 | 1209 | * tipc_sk_anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
1210 | * @m: descriptor for message info |
1211 | * @msg: received message header | |
301bae56 | 1212 | * @tsk: TIPC port associated with message |
c4307285 | 1213 | * |
b97bf3fd | 1214 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 1215 | * |
b97bf3fd PL |
1216 | * Returns 0 if successful, otherwise errno |
1217 | */ | |
301bae56 JPM |
1218 | static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
1219 | struct tipc_sock *tsk) | |
b97bf3fd PL |
1220 | { |
1221 | u32 anc_data[3]; | |
1222 | u32 err; | |
1223 | u32 dest_type; | |
3546c750 | 1224 | int has_name; |
b97bf3fd PL |
1225 | int res; |
1226 | ||
1227 | if (likely(m->msg_controllen == 0)) | |
1228 | return 0; | |
1229 | ||
1230 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
1231 | err = msg ? msg_errcode(msg) : 0; |
1232 | if (unlikely(err)) { | |
1233 | anc_data[0] = err; | |
1234 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
1235 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
1236 | if (res) | |
b97bf3fd | 1237 | return res; |
2db9983a AS |
1238 | if (anc_data[1]) { |
1239 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
1240 | msg_data(msg)); | |
1241 | if (res) | |
1242 | return res; | |
1243 | } | |
b97bf3fd PL |
1244 | } |
1245 | ||
1246 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
1247 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
1248 | switch (dest_type) { | |
1249 | case TIPC_NAMED_MSG: | |
3546c750 | 1250 | has_name = 1; |
b97bf3fd PL |
1251 | anc_data[0] = msg_nametype(msg); |
1252 | anc_data[1] = msg_namelower(msg); | |
1253 | anc_data[2] = msg_namelower(msg); | |
1254 | break; | |
1255 | case TIPC_MCAST_MSG: | |
3546c750 | 1256 | has_name = 1; |
b97bf3fd PL |
1257 | anc_data[0] = msg_nametype(msg); |
1258 | anc_data[1] = msg_namelower(msg); | |
1259 | anc_data[2] = msg_nameupper(msg); | |
1260 | break; | |
1261 | case TIPC_CONN_MSG: | |
301bae56 JPM |
1262 | has_name = (tsk->conn_type != 0); |
1263 | anc_data[0] = tsk->conn_type; | |
1264 | anc_data[1] = tsk->conn_instance; | |
1265 | anc_data[2] = tsk->conn_instance; | |
b97bf3fd PL |
1266 | break; |
1267 | default: | |
3546c750 | 1268 | has_name = 0; |
b97bf3fd | 1269 | } |
2db9983a AS |
1270 | if (has_name) { |
1271 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
1272 | if (res) | |
1273 | return res; | |
1274 | } | |
b97bf3fd PL |
1275 | |
1276 | return 0; | |
1277 | } | |
1278 | ||
301bae56 | 1279 | static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack) |
739f5e4e | 1280 | { |
f2f9800d | 1281 | struct net *net = sock_net(&tsk->sk); |
a6ca1094 | 1282 | struct sk_buff *skb = NULL; |
739f5e4e | 1283 | struct tipc_msg *msg; |
301bae56 JPM |
1284 | u32 peer_port = tsk_peer_port(tsk); |
1285 | u32 dnode = tsk_peer_node(tsk); | |
739f5e4e | 1286 | |
301bae56 | 1287 | if (!tsk->connected) |
739f5e4e | 1288 | return; |
c5898636 JPM |
1289 | skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, |
1290 | dnode, tsk_own_node(tsk), peer_port, | |
1291 | tsk->portid, TIPC_OK); | |
a6ca1094 | 1292 | if (!skb) |
739f5e4e | 1293 | return; |
a6ca1094 | 1294 | msg = buf_msg(skb); |
739f5e4e | 1295 | msg_set_msgcnt(msg, ack); |
f2f9800d | 1296 | tipc_link_xmit_skb(net, skb, dnode, msg_link_selector(msg)); |
739f5e4e JPM |
1297 | } |
1298 | ||
85d3fc94 | 1299 | static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop) |
9bbb4ecc YX |
1300 | { |
1301 | struct sock *sk = sock->sk; | |
1302 | DEFINE_WAIT(wait); | |
85d3fc94 | 1303 | long timeo = *timeop; |
9bbb4ecc YX |
1304 | int err; |
1305 | ||
1306 | for (;;) { | |
1307 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1308 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1309 | if (sock->state == SS_DISCONNECTING) { |
1310 | err = -ENOTCONN; | |
1311 | break; | |
1312 | } | |
1313 | release_sock(sk); | |
1314 | timeo = schedule_timeout(timeo); | |
1315 | lock_sock(sk); | |
1316 | } | |
1317 | err = 0; | |
1318 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1319 | break; | |
1320 | err = sock_intr_errno(timeo); | |
1321 | if (signal_pending(current)) | |
1322 | break; | |
1323 | err = -EAGAIN; | |
1324 | if (!timeo) | |
1325 | break; | |
1326 | } | |
1327 | finish_wait(sk_sleep(sk), &wait); | |
85d3fc94 | 1328 | *timeop = timeo; |
9bbb4ecc YX |
1329 | return err; |
1330 | } | |
1331 | ||
c4307285 | 1332 | /** |
247f0f3c | 1333 | * tipc_recvmsg - receive packet-oriented message |
b97bf3fd PL |
1334 | * @iocb: (unused) |
1335 | * @m: descriptor for message info | |
1336 | * @buf_len: total size of user buffer area | |
1337 | * @flags: receive flags | |
c4307285 | 1338 | * |
b97bf3fd PL |
1339 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1340 | * If the complete message doesn't fit in user area, truncate it. | |
1341 | * | |
1342 | * Returns size of returned message data, errno otherwise | |
1343 | */ | |
247f0f3c YX |
1344 | static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock, |
1345 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1346 | { |
0c3141e9 | 1347 | struct sock *sk = sock->sk; |
58ed9442 | 1348 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1349 | struct sk_buff *buf; |
1350 | struct tipc_msg *msg; | |
9bbb4ecc | 1351 | long timeo; |
b97bf3fd PL |
1352 | unsigned int sz; |
1353 | u32 err; | |
1354 | int res; | |
1355 | ||
0c3141e9 | 1356 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1357 | if (unlikely(!buf_len)) |
1358 | return -EINVAL; | |
1359 | ||
0c3141e9 | 1360 | lock_sock(sk); |
b97bf3fd | 1361 | |
0c3141e9 AS |
1362 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1363 | res = -ENOTCONN; | |
b97bf3fd PL |
1364 | goto exit; |
1365 | } | |
1366 | ||
9bbb4ecc | 1367 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1368 | restart: |
b97bf3fd | 1369 | |
0c3141e9 | 1370 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1371 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1372 | if (res) |
1373 | goto exit; | |
b97bf3fd | 1374 | |
0c3141e9 | 1375 | /* Look at first message in receive queue */ |
0c3141e9 | 1376 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1377 | msg = buf_msg(buf); |
1378 | sz = msg_data_sz(msg); | |
1379 | err = msg_errcode(msg); | |
1380 | ||
b97bf3fd | 1381 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1382 | if ((!sz) && (!err)) { |
2e84c60b | 1383 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1384 | goto restart; |
1385 | } | |
1386 | ||
1387 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1388 | set_orig_addr(m, msg); |
1389 | ||
1390 | /* Capture ancillary data (optional) */ | |
301bae56 | 1391 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1392 | if (res) |
b97bf3fd PL |
1393 | goto exit; |
1394 | ||
1395 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1396 | if (!err) { |
1397 | if (unlikely(buf_len < sz)) { | |
1398 | sz = buf_len; | |
1399 | m->msg_flags |= MSG_TRUNC; | |
1400 | } | |
51f3d02b | 1401 | res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz); |
0232fd0a | 1402 | if (res) |
b97bf3fd | 1403 | goto exit; |
b97bf3fd PL |
1404 | res = sz; |
1405 | } else { | |
1406 | if ((sock->state == SS_READY) || | |
1407 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1408 | res = 0; | |
1409 | else | |
1410 | res = -ECONNRESET; | |
1411 | } | |
1412 | ||
1413 | /* Consume received message (optional) */ | |
b97bf3fd | 1414 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1415 | if ((sock->state != SS_READY) && |
60120526 | 1416 | (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
301bae56 | 1417 | tipc_sk_send_ack(tsk, tsk->rcv_unacked); |
60120526 JPM |
1418 | tsk->rcv_unacked = 0; |
1419 | } | |
2e84c60b | 1420 | tsk_advance_rx_queue(sk); |
c4307285 | 1421 | } |
b97bf3fd | 1422 | exit: |
0c3141e9 | 1423 | release_sock(sk); |
b97bf3fd PL |
1424 | return res; |
1425 | } | |
1426 | ||
c4307285 | 1427 | /** |
247f0f3c | 1428 | * tipc_recv_stream - receive stream-oriented data |
b97bf3fd PL |
1429 | * @iocb: (unused) |
1430 | * @m: descriptor for message info | |
1431 | * @buf_len: total size of user buffer area | |
1432 | * @flags: receive flags | |
c4307285 YH |
1433 | * |
1434 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1435 | * will optionally wait for more; never truncates data. |
1436 | * | |
1437 | * Returns size of returned message data, errno otherwise | |
1438 | */ | |
247f0f3c YX |
1439 | static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock, |
1440 | struct msghdr *m, size_t buf_len, int flags) | |
b97bf3fd | 1441 | { |
0c3141e9 | 1442 | struct sock *sk = sock->sk; |
58ed9442 | 1443 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
1444 | struct sk_buff *buf; |
1445 | struct tipc_msg *msg; | |
9bbb4ecc | 1446 | long timeo; |
b97bf3fd | 1447 | unsigned int sz; |
3720d40b | 1448 | int sz_to_copy, target, needed; |
b97bf3fd | 1449 | int sz_copied = 0; |
b97bf3fd | 1450 | u32 err; |
0c3141e9 | 1451 | int res = 0; |
b97bf3fd | 1452 | |
0c3141e9 | 1453 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1454 | if (unlikely(!buf_len)) |
1455 | return -EINVAL; | |
1456 | ||
0c3141e9 | 1457 | lock_sock(sk); |
b97bf3fd | 1458 | |
9bbb4ecc | 1459 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1460 | res = -ENOTCONN; |
b97bf3fd PL |
1461 | goto exit; |
1462 | } | |
1463 | ||
3720d40b | 1464 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1465 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1466 | |
617d3c7a | 1467 | restart: |
0c3141e9 | 1468 | /* Look for a message in receive queue; wait if necessary */ |
85d3fc94 | 1469 | res = tipc_wait_for_rcvmsg(sock, &timeo); |
9bbb4ecc YX |
1470 | if (res) |
1471 | goto exit; | |
b97bf3fd | 1472 | |
0c3141e9 | 1473 | /* Look at first message in receive queue */ |
0c3141e9 | 1474 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1475 | msg = buf_msg(buf); |
1476 | sz = msg_data_sz(msg); | |
1477 | err = msg_errcode(msg); | |
1478 | ||
1479 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1480 | if ((!sz) && (!err)) { |
2e84c60b | 1481 | tsk_advance_rx_queue(sk); |
b97bf3fd PL |
1482 | goto restart; |
1483 | } | |
1484 | ||
1485 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1486 | if (sz_copied == 0) { |
1487 | set_orig_addr(m, msg); | |
301bae56 | 1488 | res = tipc_sk_anc_data_recv(m, msg, tsk); |
0c3141e9 | 1489 | if (res) |
b97bf3fd PL |
1490 | goto exit; |
1491 | } | |
1492 | ||
1493 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1494 | if (!err) { |
0232fd0a | 1495 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1496 | |
0232fd0a | 1497 | sz -= offset; |
b97bf3fd PL |
1498 | needed = (buf_len - sz_copied); |
1499 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a | 1500 | |
51f3d02b DM |
1501 | res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset, |
1502 | m, sz_to_copy); | |
0232fd0a | 1503 | if (res) |
b97bf3fd | 1504 | goto exit; |
0232fd0a | 1505 | |
b97bf3fd PL |
1506 | sz_copied += sz_to_copy; |
1507 | ||
1508 | if (sz_to_copy < sz) { | |
1509 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1510 | TIPC_SKB_CB(buf)->handle = |
1511 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1512 | goto exit; |
1513 | } | |
b97bf3fd PL |
1514 | } else { |
1515 | if (sz_copied != 0) | |
1516 | goto exit; /* can't add error msg to valid data */ | |
1517 | ||
1518 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1519 | res = 0; | |
1520 | else | |
1521 | res = -ECONNRESET; | |
1522 | } | |
1523 | ||
1524 | /* Consume received message (optional) */ | |
b97bf3fd | 1525 | if (likely(!(flags & MSG_PEEK))) { |
60120526 | 1526 | if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) { |
301bae56 | 1527 | tipc_sk_send_ack(tsk, tsk->rcv_unacked); |
60120526 JPM |
1528 | tsk->rcv_unacked = 0; |
1529 | } | |
2e84c60b | 1530 | tsk_advance_rx_queue(sk); |
c4307285 | 1531 | } |
b97bf3fd PL |
1532 | |
1533 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1534 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1535 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1536 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1537 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1538 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1539 | goto restart; |
1540 | ||
1541 | exit: | |
0c3141e9 | 1542 | release_sock(sk); |
a3b0a5a9 | 1543 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1544 | } |
1545 | ||
f288bef4 YX |
1546 | /** |
1547 | * tipc_write_space - wake up thread if port congestion is released | |
1548 | * @sk: socket | |
1549 | */ | |
1550 | static void tipc_write_space(struct sock *sk) | |
1551 | { | |
1552 | struct socket_wq *wq; | |
1553 | ||
1554 | rcu_read_lock(); | |
1555 | wq = rcu_dereference(sk->sk_wq); | |
1556 | if (wq_has_sleeper(wq)) | |
1557 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1558 | POLLWRNORM | POLLWRBAND); | |
1559 | rcu_read_unlock(); | |
1560 | } | |
1561 | ||
1562 | /** | |
1563 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1564 | * @sk: socket | |
1565 | * @len: the length of messages | |
1566 | */ | |
676d2369 | 1567 | static void tipc_data_ready(struct sock *sk) |
f288bef4 YX |
1568 | { |
1569 | struct socket_wq *wq; | |
1570 | ||
1571 | rcu_read_lock(); | |
1572 | wq = rcu_dereference(sk->sk_wq); | |
1573 | if (wq_has_sleeper(wq)) | |
1574 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1575 | POLLRDNORM | POLLRDBAND); | |
1576 | rcu_read_unlock(); | |
1577 | } | |
1578 | ||
7e6c131e YX |
1579 | /** |
1580 | * filter_connect - Handle all incoming messages for a connection-based socket | |
58ed9442 | 1581 | * @tsk: TIPC socket |
1186adf7 | 1582 | * @skb: pointer to message buffer. Set to NULL if buffer is consumed |
7e6c131e | 1583 | * |
b2ad5e5f | 1584 | * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise |
7e6c131e | 1585 | */ |
1186adf7 | 1586 | static int filter_connect(struct tipc_sock *tsk, struct sk_buff **skb) |
7e6c131e | 1587 | { |
58ed9442 | 1588 | struct sock *sk = &tsk->sk; |
f2f9800d | 1589 | struct net *net = sock_net(sk); |
8826cde6 | 1590 | struct socket *sock = sk->sk_socket; |
1186adf7 | 1591 | struct tipc_msg *msg = buf_msg(*skb); |
e4de5fab | 1592 | int retval = -TIPC_ERR_NO_PORT; |
7e6c131e YX |
1593 | |
1594 | if (msg_mcast(msg)) | |
1595 | return retval; | |
1596 | ||
1597 | switch ((int)sock->state) { | |
1598 | case SS_CONNECTED: | |
1599 | /* Accept only connection-based messages sent by peer */ | |
2e84c60b | 1600 | if (tsk_peer_msg(tsk, msg)) { |
7e6c131e YX |
1601 | if (unlikely(msg_errcode(msg))) { |
1602 | sock->state = SS_DISCONNECTING; | |
301bae56 | 1603 | tsk->connected = 0; |
dadebc00 | 1604 | /* let timer expire on it's own */ |
f2f9800d | 1605 | tipc_node_remove_conn(net, tsk_peer_node(tsk), |
07f6c4bc | 1606 | tsk->portid); |
7e6c131e YX |
1607 | } |
1608 | retval = TIPC_OK; | |
1609 | } | |
1610 | break; | |
1611 | case SS_CONNECTING: | |
1612 | /* Accept only ACK or NACK message */ | |
dadebc00 JPM |
1613 | |
1614 | if (unlikely(!msg_connected(msg))) | |
1615 | break; | |
1616 | ||
584d24b3 YX |
1617 | if (unlikely(msg_errcode(msg))) { |
1618 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1619 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1620 | retval = TIPC_OK; |
1621 | break; | |
1622 | } | |
1623 | ||
dadebc00 | 1624 | if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) { |
584d24b3 | 1625 | sock->state = SS_DISCONNECTING; |
dadebc00 | 1626 | sk->sk_err = EINVAL; |
7e6c131e | 1627 | retval = TIPC_OK; |
584d24b3 YX |
1628 | break; |
1629 | } | |
1630 | ||
301bae56 JPM |
1631 | tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg)); |
1632 | msg_set_importance(&tsk->phdr, msg_importance(msg)); | |
dadebc00 JPM |
1633 | sock->state = SS_CONNECTED; |
1634 | ||
584d24b3 YX |
1635 | /* If an incoming message is an 'ACK-', it should be |
1636 | * discarded here because it doesn't contain useful | |
1637 | * data. In addition, we should try to wake up | |
1638 | * connect() routine if sleeping. | |
1639 | */ | |
1640 | if (msg_data_sz(msg) == 0) { | |
1186adf7 JPM |
1641 | kfree_skb(*skb); |
1642 | *skb = NULL; | |
584d24b3 YX |
1643 | if (waitqueue_active(sk_sleep(sk))) |
1644 | wake_up_interruptible(sk_sleep(sk)); | |
1645 | } | |
1646 | retval = TIPC_OK; | |
7e6c131e YX |
1647 | break; |
1648 | case SS_LISTENING: | |
1649 | case SS_UNCONNECTED: | |
1650 | /* Accept only SYN message */ | |
1651 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1652 | retval = TIPC_OK; | |
1653 | break; | |
1654 | case SS_DISCONNECTING: | |
1655 | break; | |
1656 | default: | |
1657 | pr_err("Unknown socket state %u\n", sock->state); | |
1658 | } | |
1659 | return retval; | |
1660 | } | |
1661 | ||
aba79f33 YX |
1662 | /** |
1663 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1664 | * @sk: socket | |
1665 | * @buf: message | |
1666 | * | |
1667 | * For all connection oriented messages, irrespective of importance, | |
1668 | * the default overload value (i.e. 67MB) is set as limit. | |
1669 | * | |
1670 | * For all connectionless messages, by default new queue limits are | |
1671 | * as belows: | |
1672 | * | |
cc79dd1b YX |
1673 | * TIPC_LOW_IMPORTANCE (4 MB) |
1674 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1675 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1676 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1677 | * |
1678 | * Returns overload limit according to corresponding message importance | |
1679 | */ | |
1680 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1681 | { | |
1682 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1683 | |
1684 | if (msg_connected(msg)) | |
0cee6bbe | 1685 | return sysctl_tipc_rmem[2]; |
1686 | ||
1687 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1688 | msg_importance(msg); | |
aba79f33 YX |
1689 | } |
1690 | ||
c4307285 | 1691 | /** |
0c3141e9 AS |
1692 | * filter_rcv - validate incoming message |
1693 | * @sk: socket | |
1186adf7 | 1694 | * @skb: pointer to message. Set to NULL if buffer is consumed. |
c4307285 | 1695 | * |
0c3141e9 AS |
1696 | * Enqueues message on receive queue if acceptable; optionally handles |
1697 | * disconnect indication for a connected socket. | |
1698 | * | |
1186adf7 | 1699 | * Called with socket lock already taken |
c4307285 | 1700 | * |
1186adf7 | 1701 | * Returns 0 (TIPC_OK) if message was ok, -TIPC error code if rejected |
b97bf3fd | 1702 | */ |
1186adf7 | 1703 | static int filter_rcv(struct sock *sk, struct sk_buff **skb) |
b97bf3fd | 1704 | { |
0c3141e9 | 1705 | struct socket *sock = sk->sk_socket; |
58ed9442 | 1706 | struct tipc_sock *tsk = tipc_sk(sk); |
1186adf7 JPM |
1707 | struct tipc_msg *msg = buf_msg(*skb); |
1708 | unsigned int limit = rcvbuf_limit(sk, *skb); | |
e4de5fab | 1709 | int rc = TIPC_OK; |
b97bf3fd | 1710 | |
1186adf7 JPM |
1711 | if (unlikely(msg_user(msg) == CONN_MANAGER)) { |
1712 | tipc_sk_proto_rcv(tsk, skb); | |
1713 | return TIPC_OK; | |
1714 | } | |
ec8a2e56 | 1715 | |
50100a5e | 1716 | if (unlikely(msg_user(msg) == SOCK_WAKEUP)) { |
1186adf7 | 1717 | kfree_skb(*skb); |
50100a5e JPM |
1718 | tsk->link_cong = 0; |
1719 | sk->sk_write_space(sk); | |
1186adf7 | 1720 | *skb = NULL; |
50100a5e JPM |
1721 | return TIPC_OK; |
1722 | } | |
1723 | ||
b97bf3fd | 1724 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 | 1725 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
e4de5fab | 1726 | return -TIPC_ERR_NO_PORT; |
0c3141e9 | 1727 | |
b97bf3fd | 1728 | if (sock->state == SS_READY) { |
b29f1428 | 1729 | if (msg_connected(msg)) |
e4de5fab | 1730 | return -TIPC_ERR_NO_PORT; |
b97bf3fd | 1731 | } else { |
1186adf7 JPM |
1732 | rc = filter_connect(tsk, skb); |
1733 | if (rc != TIPC_OK || !*skb) | |
e4de5fab | 1734 | return rc; |
b97bf3fd PL |
1735 | } |
1736 | ||
1737 | /* Reject message if there isn't room to queue it */ | |
1186adf7 | 1738 | if (sk_rmem_alloc_get(sk) + (*skb)->truesize >= limit) |
e4de5fab | 1739 | return -TIPC_ERR_OVERLOAD; |
b97bf3fd | 1740 | |
aba79f33 | 1741 | /* Enqueue message */ |
1186adf7 JPM |
1742 | TIPC_SKB_CB(*skb)->handle = NULL; |
1743 | __skb_queue_tail(&sk->sk_receive_queue, *skb); | |
1744 | skb_set_owner_r(*skb, sk); | |
0c3141e9 | 1745 | |
676d2369 | 1746 | sk->sk_data_ready(sk); |
1186adf7 | 1747 | *skb = NULL; |
0c3141e9 AS |
1748 | return TIPC_OK; |
1749 | } | |
b97bf3fd | 1750 | |
0c3141e9 | 1751 | /** |
4f4482dc | 1752 | * tipc_backlog_rcv - handle incoming message from backlog queue |
0c3141e9 | 1753 | * @sk: socket |
a6ca1094 | 1754 | * @skb: message |
0c3141e9 | 1755 | * |
e3a77561 | 1756 | * Caller must hold socket lock |
0c3141e9 AS |
1757 | * |
1758 | * Returns 0 | |
1759 | */ | |
a6ca1094 | 1760 | static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
0c3141e9 | 1761 | { |
1186adf7 JPM |
1762 | int err; |
1763 | atomic_t *dcnt; | |
1764 | u32 dnode; | |
4f4482dc | 1765 | struct tipc_sock *tsk = tipc_sk(sk); |
34747539 | 1766 | struct net *net = sock_net(sk); |
a6ca1094 | 1767 | uint truesize = skb->truesize; |
0c3141e9 | 1768 | |
1186adf7 JPM |
1769 | err = filter_rcv(sk, &skb); |
1770 | if (likely(!skb)) { | |
1771 | dcnt = &tsk->dupl_rcvcnt; | |
1772 | if (atomic_read(dcnt) < TIPC_CONN_OVERLOAD_LIMIT) | |
1773 | atomic_add(truesize, dcnt); | |
ac0074ee JPM |
1774 | return 0; |
1775 | } | |
1186adf7 JPM |
1776 | if (!err || tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, -err)) |
1777 | tipc_link_xmit_skb(net, skb, dnode, tsk->portid); | |
0c3141e9 AS |
1778 | return 0; |
1779 | } | |
1780 | ||
d570d864 | 1781 | /** |
c637c103 JPM |
1782 | * tipc_sk_enqueue - extract all buffers with destination 'dport' from |
1783 | * inputq and try adding them to socket or backlog queue | |
1784 | * @inputq: list of incoming buffers with potentially different destinations | |
1785 | * @sk: socket where the buffers should be enqueued | |
1786 | * @dport: port number for the socket | |
1787 | * @_skb: returned buffer to be forwarded or rejected, if applicable | |
d570d864 JPM |
1788 | * |
1789 | * Caller must hold socket lock | |
1790 | * | |
c637c103 JPM |
1791 | * Returns TIPC_OK if all buffers enqueued, otherwise -TIPC_ERR_OVERLOAD |
1792 | * or -TIPC_ERR_NO_PORT | |
d570d864 | 1793 | */ |
c637c103 JPM |
1794 | static int tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk, |
1795 | u32 dport, struct sk_buff **_skb) | |
d570d864 JPM |
1796 | { |
1797 | unsigned int lim; | |
1798 | atomic_t *dcnt; | |
c637c103 JPM |
1799 | int err; |
1800 | struct sk_buff *skb; | |
1801 | unsigned long time_limit = jiffies + 2; | |
1802 | ||
1803 | while (skb_queue_len(inputq)) { | |
51a00daf JPM |
1804 | if (unlikely(time_after_eq(jiffies, time_limit))) |
1805 | return TIPC_OK; | |
c637c103 JPM |
1806 | skb = tipc_skb_dequeue(inputq, dport); |
1807 | if (unlikely(!skb)) | |
1808 | return TIPC_OK; | |
c637c103 JPM |
1809 | if (!sock_owned_by_user(sk)) { |
1810 | err = filter_rcv(sk, &skb); | |
1811 | if (likely(!skb)) | |
1812 | continue; | |
1813 | *_skb = skb; | |
1814 | return err; | |
1815 | } | |
1816 | dcnt = &tipc_sk(sk)->dupl_rcvcnt; | |
1817 | if (sk->sk_backlog.len) | |
1818 | atomic_set(dcnt, 0); | |
1819 | lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt); | |
1820 | if (likely(!sk_add_backlog(sk, skb, lim))) | |
1821 | continue; | |
1822 | *_skb = skb; | |
d570d864 | 1823 | return -TIPC_ERR_OVERLOAD; |
c637c103 | 1824 | } |
d570d864 JPM |
1825 | return TIPC_OK; |
1826 | } | |
1827 | ||
0c3141e9 | 1828 | /** |
c637c103 JPM |
1829 | * tipc_sk_rcv - handle a chain of incoming buffers |
1830 | * @inputq: buffer list containing the buffers | |
1831 | * Consumes all buffers in list until inputq is empty | |
1832 | * Note: may be called in multiple threads referring to the same queue | |
1833 | * Returns 0 if last buffer was accepted, otherwise -EHOSTUNREACH | |
1834 | * Only node local calls check the return value, sending single-buffer queues | |
0c3141e9 | 1835 | */ |
c637c103 | 1836 | int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq) |
0c3141e9 | 1837 | { |
c637c103 JPM |
1838 | u32 dnode, dport = 0; |
1839 | int err = -TIPC_ERR_NO_PORT; | |
1840 | struct sk_buff *skb; | |
9816f061 | 1841 | struct tipc_sock *tsk; |
c5898636 | 1842 | struct tipc_net *tn; |
9816f061 | 1843 | struct sock *sk; |
9816f061 | 1844 | |
c637c103 JPM |
1845 | while (skb_queue_len(inputq)) { |
1846 | skb = NULL; | |
1847 | dport = tipc_skb_peek_port(inputq, dport); | |
1848 | tsk = tipc_sk_lookup(net, dport); | |
1849 | if (likely(tsk)) { | |
1850 | sk = &tsk->sk; | |
1851 | if (likely(spin_trylock_bh(&sk->sk_lock.slock))) { | |
1852 | err = tipc_sk_enqueue(inputq, sk, dport, &skb); | |
1853 | spin_unlock_bh(&sk->sk_lock.slock); | |
1854 | dport = 0; | |
1855 | } | |
1856 | sock_put(sk); | |
1857 | } else { | |
1858 | skb = tipc_skb_dequeue(inputq, dport); | |
1859 | } | |
1860 | if (likely(!skb)) | |
1861 | continue; | |
1862 | if (tipc_msg_lookup_dest(net, skb, &dnode, &err)) | |
1863 | goto xmit; | |
1864 | if (!err) { | |
1865 | dnode = msg_destnode(buf_msg(skb)); | |
1866 | goto xmit; | |
1867 | } | |
1868 | tn = net_generic(net, tipc_net_id); | |
1869 | if (!tipc_msg_reverse(tn->own_addr, skb, &dnode, -err)) | |
1870 | continue; | |
e3a77561 | 1871 | xmit: |
c637c103 JPM |
1872 | tipc_link_xmit_skb(net, skb, dnode, dport); |
1873 | } | |
1186adf7 | 1874 | return err ? -EHOSTUNREACH : 0; |
b97bf3fd PL |
1875 | } |
1876 | ||
78eb3a53 YX |
1877 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1878 | { | |
1879 | struct sock *sk = sock->sk; | |
1880 | DEFINE_WAIT(wait); | |
1881 | int done; | |
1882 | ||
1883 | do { | |
1884 | int err = sock_error(sk); | |
1885 | if (err) | |
1886 | return err; | |
1887 | if (!*timeo_p) | |
1888 | return -ETIMEDOUT; | |
1889 | if (signal_pending(current)) | |
1890 | return sock_intr_errno(*timeo_p); | |
1891 | ||
1892 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1893 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1894 | finish_wait(sk_sleep(sk), &wait); | |
1895 | } while (!done); | |
1896 | return 0; | |
1897 | } | |
1898 | ||
b97bf3fd | 1899 | /** |
247f0f3c | 1900 | * tipc_connect - establish a connection to another TIPC port |
b97bf3fd PL |
1901 | * @sock: socket structure |
1902 | * @dest: socket address for destination port | |
1903 | * @destlen: size of socket address data structure | |
0c3141e9 | 1904 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1905 | * |
1906 | * Returns 0 on success, errno otherwise | |
1907 | */ | |
247f0f3c YX |
1908 | static int tipc_connect(struct socket *sock, struct sockaddr *dest, |
1909 | int destlen, int flags) | |
b97bf3fd | 1910 | { |
0c3141e9 | 1911 | struct sock *sk = sock->sk; |
b89741a0 AS |
1912 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1913 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1914 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1915 | socket_state previous; | |
b89741a0 AS |
1916 | int res; |
1917 | ||
0c3141e9 AS |
1918 | lock_sock(sk); |
1919 | ||
b89741a0 | 1920 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1921 | if (sock->state == SS_READY) { |
1922 | res = -EOPNOTSUPP; | |
1923 | goto exit; | |
1924 | } | |
b89741a0 | 1925 | |
b89741a0 AS |
1926 | /* |
1927 | * Reject connection attempt using multicast address | |
1928 | * | |
1929 | * Note: send_msg() validates the rest of the address fields, | |
1930 | * so there's no need to do it here | |
1931 | */ | |
0c3141e9 AS |
1932 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1933 | res = -EINVAL; | |
1934 | goto exit; | |
1935 | } | |
1936 | ||
78eb3a53 | 1937 | previous = sock->state; |
584d24b3 YX |
1938 | switch (sock->state) { |
1939 | case SS_UNCONNECTED: | |
1940 | /* Send a 'SYN-' to destination */ | |
1941 | m.msg_name = dest; | |
1942 | m.msg_namelen = destlen; | |
1943 | ||
1944 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1945 | * indicate send_msg() is never blocked. | |
1946 | */ | |
1947 | if (!timeout) | |
1948 | m.msg_flags = MSG_DONTWAIT; | |
1949 | ||
247f0f3c | 1950 | res = tipc_sendmsg(NULL, sock, &m, 0); |
584d24b3 YX |
1951 | if ((res < 0) && (res != -EWOULDBLOCK)) |
1952 | goto exit; | |
1953 | ||
1954 | /* Just entered SS_CONNECTING state; the only | |
1955 | * difference is that return value in non-blocking | |
1956 | * case is EINPROGRESS, rather than EALREADY. | |
1957 | */ | |
1958 | res = -EINPROGRESS; | |
584d24b3 | 1959 | case SS_CONNECTING: |
78eb3a53 YX |
1960 | if (previous == SS_CONNECTING) |
1961 | res = -EALREADY; | |
1962 | if (!timeout) | |
1963 | goto exit; | |
1964 | timeout = msecs_to_jiffies(timeout); | |
1965 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1966 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1967 | break; |
1968 | case SS_CONNECTED: | |
1969 | res = -EISCONN; | |
1970 | break; | |
1971 | default: | |
1972 | res = -EINVAL; | |
78eb3a53 | 1973 | break; |
b89741a0 | 1974 | } |
0c3141e9 AS |
1975 | exit: |
1976 | release_sock(sk); | |
b89741a0 | 1977 | return res; |
b97bf3fd PL |
1978 | } |
1979 | ||
c4307285 | 1980 | /** |
247f0f3c | 1981 | * tipc_listen - allow socket to listen for incoming connections |
b97bf3fd PL |
1982 | * @sock: socket structure |
1983 | * @len: (unused) | |
c4307285 | 1984 | * |
b97bf3fd PL |
1985 | * Returns 0 on success, errno otherwise |
1986 | */ | |
247f0f3c | 1987 | static int tipc_listen(struct socket *sock, int len) |
b97bf3fd | 1988 | { |
0c3141e9 AS |
1989 | struct sock *sk = sock->sk; |
1990 | int res; | |
1991 | ||
1992 | lock_sock(sk); | |
b97bf3fd | 1993 | |
245f3d34 | 1994 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1995 | res = -EINVAL; |
1996 | else { | |
1997 | sock->state = SS_LISTENING; | |
1998 | res = 0; | |
1999 | } | |
2000 | ||
2001 | release_sock(sk); | |
2002 | return res; | |
b97bf3fd PL |
2003 | } |
2004 | ||
6398e23c YX |
2005 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
2006 | { | |
2007 | struct sock *sk = sock->sk; | |
2008 | DEFINE_WAIT(wait); | |
2009 | int err; | |
2010 | ||
2011 | /* True wake-one mechanism for incoming connections: only | |
2012 | * one process gets woken up, not the 'whole herd'. | |
2013 | * Since we do not 'race & poll' for established sockets | |
2014 | * anymore, the common case will execute the loop only once. | |
2015 | */ | |
2016 | for (;;) { | |
2017 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
2018 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 2019 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
2020 | release_sock(sk); |
2021 | timeo = schedule_timeout(timeo); | |
2022 | lock_sock(sk); | |
2023 | } | |
2024 | err = 0; | |
2025 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
2026 | break; | |
2027 | err = -EINVAL; | |
2028 | if (sock->state != SS_LISTENING) | |
2029 | break; | |
2030 | err = sock_intr_errno(timeo); | |
2031 | if (signal_pending(current)) | |
2032 | break; | |
2033 | err = -EAGAIN; | |
2034 | if (!timeo) | |
2035 | break; | |
2036 | } | |
2037 | finish_wait(sk_sleep(sk), &wait); | |
2038 | return err; | |
2039 | } | |
2040 | ||
c4307285 | 2041 | /** |
247f0f3c | 2042 | * tipc_accept - wait for connection request |
b97bf3fd PL |
2043 | * @sock: listening socket |
2044 | * @newsock: new socket that is to be connected | |
2045 | * @flags: file-related flags associated with socket | |
c4307285 | 2046 | * |
b97bf3fd PL |
2047 | * Returns 0 on success, errno otherwise |
2048 | */ | |
247f0f3c | 2049 | static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 2050 | { |
0fef8f20 | 2051 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 2052 | struct sk_buff *buf; |
301bae56 | 2053 | struct tipc_sock *new_tsock; |
0fef8f20 | 2054 | struct tipc_msg *msg; |
6398e23c | 2055 | long timeo; |
0c3141e9 | 2056 | int res; |
b97bf3fd | 2057 | |
0c3141e9 | 2058 | lock_sock(sk); |
b97bf3fd | 2059 | |
0c3141e9 AS |
2060 | if (sock->state != SS_LISTENING) { |
2061 | res = -EINVAL; | |
b97bf3fd PL |
2062 | goto exit; |
2063 | } | |
6398e23c YX |
2064 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
2065 | res = tipc_wait_for_accept(sock, timeo); | |
2066 | if (res) | |
2067 | goto exit; | |
0c3141e9 AS |
2068 | |
2069 | buf = skb_peek(&sk->sk_receive_queue); | |
2070 | ||
c5fa7b3c | 2071 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
2072 | if (res) |
2073 | goto exit; | |
b97bf3fd | 2074 | |
0fef8f20 | 2075 | new_sk = new_sock->sk; |
301bae56 | 2076 | new_tsock = tipc_sk(new_sk); |
0fef8f20 | 2077 | msg = buf_msg(buf); |
b97bf3fd | 2078 | |
0fef8f20 PG |
2079 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
2080 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
2081 | ||
2082 | /* | |
2083 | * Reject any stray messages received by new socket | |
2084 | * before the socket lock was taken (very, very unlikely) | |
2085 | */ | |
2e84c60b | 2086 | tsk_rej_rx_queue(new_sk); |
0fef8f20 PG |
2087 | |
2088 | /* Connect new socket to it's peer */ | |
301bae56 | 2089 | tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg)); |
0fef8f20 PG |
2090 | new_sock->state = SS_CONNECTED; |
2091 | ||
301bae56 | 2092 | tsk_set_importance(new_tsock, msg_importance(msg)); |
0fef8f20 | 2093 | if (msg_named(msg)) { |
301bae56 JPM |
2094 | new_tsock->conn_type = msg_nametype(msg); |
2095 | new_tsock->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 2096 | } |
0fef8f20 PG |
2097 | |
2098 | /* | |
2099 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
2100 | * Respond to 'SYN+' by queuing it on new socket. | |
2101 | */ | |
2102 | if (!msg_data_sz(msg)) { | |
2103 | struct msghdr m = {NULL,}; | |
2104 | ||
2e84c60b | 2105 | tsk_advance_rx_queue(sk); |
247f0f3c | 2106 | tipc_send_packet(NULL, new_sock, &m, 0); |
0fef8f20 PG |
2107 | } else { |
2108 | __skb_dequeue(&sk->sk_receive_queue); | |
2109 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 2110 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
2111 | } |
2112 | release_sock(new_sk); | |
b97bf3fd | 2113 | exit: |
0c3141e9 | 2114 | release_sock(sk); |
b97bf3fd PL |
2115 | return res; |
2116 | } | |
2117 | ||
2118 | /** | |
247f0f3c | 2119 | * tipc_shutdown - shutdown socket connection |
b97bf3fd | 2120 | * @sock: socket structure |
e247a8f5 | 2121 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
2122 | * |
2123 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 2124 | * |
b97bf3fd PL |
2125 | * Returns 0 on success, errno otherwise |
2126 | */ | |
247f0f3c | 2127 | static int tipc_shutdown(struct socket *sock, int how) |
b97bf3fd | 2128 | { |
0c3141e9 | 2129 | struct sock *sk = sock->sk; |
f2f9800d | 2130 | struct net *net = sock_net(sk); |
58ed9442 | 2131 | struct tipc_sock *tsk = tipc_sk(sk); |
a6ca1094 | 2132 | struct sk_buff *skb; |
80e44c22 | 2133 | u32 dnode; |
b97bf3fd PL |
2134 | int res; |
2135 | ||
e247a8f5 AS |
2136 | if (how != SHUT_RDWR) |
2137 | return -EINVAL; | |
b97bf3fd | 2138 | |
0c3141e9 | 2139 | lock_sock(sk); |
b97bf3fd PL |
2140 | |
2141 | switch (sock->state) { | |
0c3141e9 | 2142 | case SS_CONNECTING: |
b97bf3fd PL |
2143 | case SS_CONNECTED: |
2144 | ||
b97bf3fd | 2145 | restart: |
617d3c7a | 2146 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
a6ca1094 YX |
2147 | skb = __skb_dequeue(&sk->sk_receive_queue); |
2148 | if (skb) { | |
2149 | if (TIPC_SKB_CB(skb)->handle != NULL) { | |
2150 | kfree_skb(skb); | |
b97bf3fd PL |
2151 | goto restart; |
2152 | } | |
c5898636 | 2153 | if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, |
34747539 | 2154 | TIPC_CONN_SHUTDOWN)) |
f2f9800d YX |
2155 | tipc_link_xmit_skb(net, skb, dnode, |
2156 | tsk->portid); | |
2157 | tipc_node_remove_conn(net, dnode, tsk->portid); | |
0c3141e9 | 2158 | } else { |
301bae56 | 2159 | dnode = tsk_peer_node(tsk); |
c5898636 JPM |
2160 | |
2161 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, | |
80e44c22 | 2162 | TIPC_CONN_MSG, SHORT_H_SIZE, |
c5898636 | 2163 | 0, dnode, tsk_own_node(tsk), |
301bae56 | 2164 | tsk_peer_port(tsk), |
07f6c4bc | 2165 | tsk->portid, TIPC_CONN_SHUTDOWN); |
f2f9800d | 2166 | tipc_link_xmit_skb(net, skb, dnode, tsk->portid); |
b97bf3fd | 2167 | } |
301bae56 | 2168 | tsk->connected = 0; |
0c3141e9 | 2169 | sock->state = SS_DISCONNECTING; |
f2f9800d | 2170 | tipc_node_remove_conn(net, dnode, tsk->portid); |
b97bf3fd PL |
2171 | /* fall through */ |
2172 | ||
2173 | case SS_DISCONNECTING: | |
2174 | ||
75031151 | 2175 | /* Discard any unreceived messages */ |
57467e56 | 2176 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
2177 | |
2178 | /* Wake up anyone sleeping in poll */ | |
2179 | sk->sk_state_change(sk); | |
b97bf3fd PL |
2180 | res = 0; |
2181 | break; | |
2182 | ||
2183 | default: | |
2184 | res = -ENOTCONN; | |
2185 | } | |
2186 | ||
0c3141e9 | 2187 | release_sock(sk); |
b97bf3fd PL |
2188 | return res; |
2189 | } | |
2190 | ||
f2f2a96a | 2191 | static void tipc_sk_timeout(unsigned long data) |
57289015 | 2192 | { |
f2f2a96a YX |
2193 | struct tipc_sock *tsk = (struct tipc_sock *)data; |
2194 | struct sock *sk = &tsk->sk; | |
a6ca1094 | 2195 | struct sk_buff *skb = NULL; |
57289015 | 2196 | u32 peer_port, peer_node; |
c5898636 | 2197 | u32 own_node = tsk_own_node(tsk); |
57289015 | 2198 | |
6c9808ce | 2199 | bh_lock_sock(sk); |
301bae56 | 2200 | if (!tsk->connected) { |
6c9808ce JPM |
2201 | bh_unlock_sock(sk); |
2202 | goto exit; | |
57289015 | 2203 | } |
301bae56 JPM |
2204 | peer_port = tsk_peer_port(tsk); |
2205 | peer_node = tsk_peer_node(tsk); | |
57289015 | 2206 | |
301bae56 | 2207 | if (tsk->probing_state == TIPC_CONN_PROBING) { |
57289015 | 2208 | /* Previous probe not answered -> self abort */ |
c5898636 | 2209 | skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, |
34747539 | 2210 | TIPC_CONN_MSG, SHORT_H_SIZE, 0, |
c5898636 | 2211 | own_node, peer_node, tsk->portid, |
34747539 | 2212 | peer_port, TIPC_ERR_NO_PORT); |
57289015 | 2213 | } else { |
c5898636 JPM |
2214 | skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, |
2215 | INT_H_SIZE, 0, peer_node, own_node, | |
f2f2a96a | 2216 | peer_port, tsk->portid, TIPC_OK); |
301bae56 | 2217 | tsk->probing_state = TIPC_CONN_PROBING; |
3721e9c7 | 2218 | sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv); |
57289015 JPM |
2219 | } |
2220 | bh_unlock_sock(sk); | |
a6ca1094 | 2221 | if (skb) |
f2f9800d | 2222 | tipc_link_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid); |
6c9808ce | 2223 | exit: |
07f6c4bc | 2224 | sock_put(sk); |
57289015 JPM |
2225 | } |
2226 | ||
301bae56 | 2227 | static int tipc_sk_publish(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2228 | struct tipc_name_seq const *seq) |
2229 | { | |
f2f9800d | 2230 | struct net *net = sock_net(&tsk->sk); |
0fc87aae JPM |
2231 | struct publication *publ; |
2232 | u32 key; | |
2233 | ||
301bae56 | 2234 | if (tsk->connected) |
0fc87aae | 2235 | return -EINVAL; |
07f6c4bc YX |
2236 | key = tsk->portid + tsk->pub_count + 1; |
2237 | if (key == tsk->portid) | |
0fc87aae JPM |
2238 | return -EADDRINUSE; |
2239 | ||
f2f9800d | 2240 | publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper, |
07f6c4bc | 2241 | scope, tsk->portid, key); |
0fc87aae JPM |
2242 | if (unlikely(!publ)) |
2243 | return -EINVAL; | |
2244 | ||
301bae56 JPM |
2245 | list_add(&publ->pport_list, &tsk->publications); |
2246 | tsk->pub_count++; | |
2247 | tsk->published = 1; | |
0fc87aae JPM |
2248 | return 0; |
2249 | } | |
2250 | ||
301bae56 | 2251 | static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope, |
0fc87aae JPM |
2252 | struct tipc_name_seq const *seq) |
2253 | { | |
f2f9800d | 2254 | struct net *net = sock_net(&tsk->sk); |
0fc87aae JPM |
2255 | struct publication *publ; |
2256 | struct publication *safe; | |
2257 | int rc = -EINVAL; | |
2258 | ||
301bae56 | 2259 | list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) { |
0fc87aae JPM |
2260 | if (seq) { |
2261 | if (publ->scope != scope) | |
2262 | continue; | |
2263 | if (publ->type != seq->type) | |
2264 | continue; | |
2265 | if (publ->lower != seq->lower) | |
2266 | continue; | |
2267 | if (publ->upper != seq->upper) | |
2268 | break; | |
f2f9800d | 2269 | tipc_nametbl_withdraw(net, publ->type, publ->lower, |
0fc87aae JPM |
2270 | publ->ref, publ->key); |
2271 | rc = 0; | |
2272 | break; | |
2273 | } | |
f2f9800d | 2274 | tipc_nametbl_withdraw(net, publ->type, publ->lower, |
0fc87aae JPM |
2275 | publ->ref, publ->key); |
2276 | rc = 0; | |
2277 | } | |
301bae56 JPM |
2278 | if (list_empty(&tsk->publications)) |
2279 | tsk->published = 0; | |
0fc87aae JPM |
2280 | return rc; |
2281 | } | |
2282 | ||
5a9ee0be JPM |
2283 | /* tipc_sk_reinit: set non-zero address in all existing sockets |
2284 | * when we go from standalone to network mode. | |
2285 | */ | |
e05b31f4 | 2286 | void tipc_sk_reinit(struct net *net) |
5a9ee0be | 2287 | { |
e05b31f4 | 2288 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
07f6c4bc YX |
2289 | const struct bucket_table *tbl; |
2290 | struct rhash_head *pos; | |
2291 | struct tipc_sock *tsk; | |
5a9ee0be | 2292 | struct tipc_msg *msg; |
07f6c4bc | 2293 | int i; |
5a9ee0be | 2294 | |
07f6c4bc | 2295 | rcu_read_lock(); |
e05b31f4 | 2296 | tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht); |
07f6c4bc YX |
2297 | for (i = 0; i < tbl->size; i++) { |
2298 | rht_for_each_entry_rcu(tsk, pos, tbl, i, node) { | |
2299 | spin_lock_bh(&tsk->sk.sk_lock.slock); | |
2300 | msg = &tsk->phdr; | |
34747539 YX |
2301 | msg_set_prevnode(msg, tn->own_addr); |
2302 | msg_set_orignode(msg, tn->own_addr); | |
07f6c4bc YX |
2303 | spin_unlock_bh(&tsk->sk.sk_lock.slock); |
2304 | } | |
5a9ee0be | 2305 | } |
07f6c4bc | 2306 | rcu_read_unlock(); |
5a9ee0be JPM |
2307 | } |
2308 | ||
e05b31f4 | 2309 | static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid) |
808d90f9 | 2310 | { |
e05b31f4 | 2311 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
07f6c4bc | 2312 | struct tipc_sock *tsk; |
808d90f9 | 2313 | |
07f6c4bc | 2314 | rcu_read_lock(); |
e05b31f4 | 2315 | tsk = rhashtable_lookup(&tn->sk_rht, &portid); |
07f6c4bc YX |
2316 | if (tsk) |
2317 | sock_hold(&tsk->sk); | |
2318 | rcu_read_unlock(); | |
808d90f9 | 2319 | |
07f6c4bc | 2320 | return tsk; |
808d90f9 JPM |
2321 | } |
2322 | ||
07f6c4bc | 2323 | static int tipc_sk_insert(struct tipc_sock *tsk) |
808d90f9 | 2324 | { |
e05b31f4 YX |
2325 | struct sock *sk = &tsk->sk; |
2326 | struct net *net = sock_net(sk); | |
2327 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
07f6c4bc YX |
2328 | u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1; |
2329 | u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT; | |
808d90f9 | 2330 | |
07f6c4bc YX |
2331 | while (remaining--) { |
2332 | portid++; | |
2333 | if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT)) | |
2334 | portid = TIPC_MIN_PORT; | |
2335 | tsk->portid = portid; | |
2336 | sock_hold(&tsk->sk); | |
e05b31f4 | 2337 | if (rhashtable_lookup_insert(&tn->sk_rht, &tsk->node)) |
07f6c4bc YX |
2338 | return 0; |
2339 | sock_put(&tsk->sk); | |
808d90f9 JPM |
2340 | } |
2341 | ||
07f6c4bc | 2342 | return -1; |
808d90f9 JPM |
2343 | } |
2344 | ||
07f6c4bc | 2345 | static void tipc_sk_remove(struct tipc_sock *tsk) |
808d90f9 | 2346 | { |
07f6c4bc | 2347 | struct sock *sk = &tsk->sk; |
e05b31f4 | 2348 | struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id); |
808d90f9 | 2349 | |
e05b31f4 | 2350 | if (rhashtable_remove(&tn->sk_rht, &tsk->node)) { |
07f6c4bc YX |
2351 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
2352 | __sock_put(sk); | |
808d90f9 | 2353 | } |
808d90f9 JPM |
2354 | } |
2355 | ||
e05b31f4 | 2356 | int tipc_sk_rht_init(struct net *net) |
808d90f9 | 2357 | { |
e05b31f4 | 2358 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
07f6c4bc YX |
2359 | struct rhashtable_params rht_params = { |
2360 | .nelem_hint = 192, | |
2361 | .head_offset = offsetof(struct tipc_sock, node), | |
2362 | .key_offset = offsetof(struct tipc_sock, portid), | |
2363 | .key_len = sizeof(u32), /* portid */ | |
2364 | .hashfn = jhash, | |
2365 | .max_shift = 20, /* 1M */ | |
2366 | .min_shift = 8, /* 256 */ | |
2367 | .grow_decision = rht_grow_above_75, | |
2368 | .shrink_decision = rht_shrink_below_30, | |
2369 | }; | |
808d90f9 | 2370 | |
e05b31f4 | 2371 | return rhashtable_init(&tn->sk_rht, &rht_params); |
808d90f9 JPM |
2372 | } |
2373 | ||
e05b31f4 | 2374 | void tipc_sk_rht_destroy(struct net *net) |
808d90f9 | 2375 | { |
e05b31f4 YX |
2376 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
2377 | ||
07f6c4bc YX |
2378 | /* Wait for socket readers to complete */ |
2379 | synchronize_net(); | |
808d90f9 | 2380 | |
e05b31f4 | 2381 | rhashtable_destroy(&tn->sk_rht); |
808d90f9 JPM |
2382 | } |
2383 | ||
b97bf3fd | 2384 | /** |
247f0f3c | 2385 | * tipc_setsockopt - set socket option |
b97bf3fd PL |
2386 | * @sock: socket structure |
2387 | * @lvl: option level | |
2388 | * @opt: option identifier | |
2389 | * @ov: pointer to new option value | |
2390 | * @ol: length of option value | |
c4307285 YH |
2391 | * |
2392 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 2393 | * (to ease compatibility). |
c4307285 | 2394 | * |
b97bf3fd PL |
2395 | * Returns 0 on success, errno otherwise |
2396 | */ | |
247f0f3c YX |
2397 | static int tipc_setsockopt(struct socket *sock, int lvl, int opt, |
2398 | char __user *ov, unsigned int ol) | |
b97bf3fd | 2399 | { |
0c3141e9 | 2400 | struct sock *sk = sock->sk; |
58ed9442 | 2401 | struct tipc_sock *tsk = tipc_sk(sk); |
b97bf3fd PL |
2402 | u32 value; |
2403 | int res; | |
2404 | ||
c4307285 YH |
2405 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2406 | return 0; | |
b97bf3fd PL |
2407 | if (lvl != SOL_TIPC) |
2408 | return -ENOPROTOOPT; | |
2409 | if (ol < sizeof(value)) | |
2410 | return -EINVAL; | |
2db9983a AS |
2411 | res = get_user(value, (u32 __user *)ov); |
2412 | if (res) | |
b97bf3fd PL |
2413 | return res; |
2414 | ||
0c3141e9 | 2415 | lock_sock(sk); |
c4307285 | 2416 | |
b97bf3fd PL |
2417 | switch (opt) { |
2418 | case TIPC_IMPORTANCE: | |
301bae56 | 2419 | res = tsk_set_importance(tsk, value); |
b97bf3fd PL |
2420 | break; |
2421 | case TIPC_SRC_DROPPABLE: | |
2422 | if (sock->type != SOCK_STREAM) | |
301bae56 | 2423 | tsk_set_unreliable(tsk, value); |
c4307285 | 2424 | else |
b97bf3fd PL |
2425 | res = -ENOPROTOOPT; |
2426 | break; | |
2427 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2428 | tsk_set_unreturnable(tsk, value); |
b97bf3fd PL |
2429 | break; |
2430 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 2431 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 2432 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
2433 | break; |
2434 | default: | |
2435 | res = -EINVAL; | |
2436 | } | |
2437 | ||
0c3141e9 AS |
2438 | release_sock(sk); |
2439 | ||
b97bf3fd PL |
2440 | return res; |
2441 | } | |
2442 | ||
2443 | /** | |
247f0f3c | 2444 | * tipc_getsockopt - get socket option |
b97bf3fd PL |
2445 | * @sock: socket structure |
2446 | * @lvl: option level | |
2447 | * @opt: option identifier | |
2448 | * @ov: receptacle for option value | |
2449 | * @ol: receptacle for length of option value | |
c4307285 YH |
2450 | * |
2451 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 2452 | * (to ease compatibility). |
c4307285 | 2453 | * |
b97bf3fd PL |
2454 | * Returns 0 on success, errno otherwise |
2455 | */ | |
247f0f3c YX |
2456 | static int tipc_getsockopt(struct socket *sock, int lvl, int opt, |
2457 | char __user *ov, int __user *ol) | |
b97bf3fd | 2458 | { |
0c3141e9 | 2459 | struct sock *sk = sock->sk; |
58ed9442 | 2460 | struct tipc_sock *tsk = tipc_sk(sk); |
c4307285 | 2461 | int len; |
b97bf3fd | 2462 | u32 value; |
c4307285 | 2463 | int res; |
b97bf3fd | 2464 | |
c4307285 YH |
2465 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
2466 | return put_user(0, ol); | |
b97bf3fd PL |
2467 | if (lvl != SOL_TIPC) |
2468 | return -ENOPROTOOPT; | |
2db9983a AS |
2469 | res = get_user(len, ol); |
2470 | if (res) | |
c4307285 | 2471 | return res; |
b97bf3fd | 2472 | |
0c3141e9 | 2473 | lock_sock(sk); |
b97bf3fd PL |
2474 | |
2475 | switch (opt) { | |
2476 | case TIPC_IMPORTANCE: | |
301bae56 | 2477 | value = tsk_importance(tsk); |
b97bf3fd PL |
2478 | break; |
2479 | case TIPC_SRC_DROPPABLE: | |
301bae56 | 2480 | value = tsk_unreliable(tsk); |
b97bf3fd PL |
2481 | break; |
2482 | case TIPC_DEST_DROPPABLE: | |
301bae56 | 2483 | value = tsk_unreturnable(tsk); |
b97bf3fd PL |
2484 | break; |
2485 | case TIPC_CONN_TIMEOUT: | |
301bae56 | 2486 | value = tsk->conn_timeout; |
0c3141e9 | 2487 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 2488 | break; |
0e65967e | 2489 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 2490 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 2491 | break; |
0e65967e | 2492 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 2493 | value = skb_queue_len(&sk->sk_receive_queue); |
2494 | break; | |
b97bf3fd PL |
2495 | default: |
2496 | res = -EINVAL; | |
2497 | } | |
2498 | ||
0c3141e9 AS |
2499 | release_sock(sk); |
2500 | ||
25860c3b PG |
2501 | if (res) |
2502 | return res; /* "get" failed */ | |
b97bf3fd | 2503 | |
25860c3b PG |
2504 | if (len < sizeof(value)) |
2505 | return -EINVAL; | |
2506 | ||
2507 | if (copy_to_user(ov, &value, sizeof(value))) | |
2508 | return -EFAULT; | |
2509 | ||
2510 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
2511 | } |
2512 | ||
f2f9800d | 2513 | static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
78acb1f9 | 2514 | { |
f2f9800d | 2515 | struct sock *sk = sock->sk; |
78acb1f9 EH |
2516 | struct tipc_sioc_ln_req lnr; |
2517 | void __user *argp = (void __user *)arg; | |
2518 | ||
2519 | switch (cmd) { | |
2520 | case SIOCGETLINKNAME: | |
2521 | if (copy_from_user(&lnr, argp, sizeof(lnr))) | |
2522 | return -EFAULT; | |
f2f9800d YX |
2523 | if (!tipc_node_get_linkname(sock_net(sk), |
2524 | lnr.bearer_id & 0xffff, lnr.peer, | |
78acb1f9 EH |
2525 | lnr.linkname, TIPC_MAX_LINK_NAME)) { |
2526 | if (copy_to_user(argp, &lnr, sizeof(lnr))) | |
2527 | return -EFAULT; | |
2528 | return 0; | |
2529 | } | |
2530 | return -EADDRNOTAVAIL; | |
78acb1f9 EH |
2531 | default: |
2532 | return -ENOIOCTLCMD; | |
2533 | } | |
2534 | } | |
2535 | ||
ae86b9e3 BH |
2536 | /* Protocol switches for the various types of TIPC sockets */ |
2537 | ||
bca65eae | 2538 | static const struct proto_ops msg_ops = { |
0e65967e | 2539 | .owner = THIS_MODULE, |
b97bf3fd | 2540 | .family = AF_TIPC, |
247f0f3c YX |
2541 | .release = tipc_release, |
2542 | .bind = tipc_bind, | |
2543 | .connect = tipc_connect, | |
5eee6a6d | 2544 | .socketpair = sock_no_socketpair, |
245f3d34 | 2545 | .accept = sock_no_accept, |
247f0f3c YX |
2546 | .getname = tipc_getname, |
2547 | .poll = tipc_poll, | |
78acb1f9 | 2548 | .ioctl = tipc_ioctl, |
245f3d34 | 2549 | .listen = sock_no_listen, |
247f0f3c YX |
2550 | .shutdown = tipc_shutdown, |
2551 | .setsockopt = tipc_setsockopt, | |
2552 | .getsockopt = tipc_getsockopt, | |
2553 | .sendmsg = tipc_sendmsg, | |
2554 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2555 | .mmap = sock_no_mmap, |
2556 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2557 | }; |
2558 | ||
bca65eae | 2559 | static const struct proto_ops packet_ops = { |
0e65967e | 2560 | .owner = THIS_MODULE, |
b97bf3fd | 2561 | .family = AF_TIPC, |
247f0f3c YX |
2562 | .release = tipc_release, |
2563 | .bind = tipc_bind, | |
2564 | .connect = tipc_connect, | |
5eee6a6d | 2565 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2566 | .accept = tipc_accept, |
2567 | .getname = tipc_getname, | |
2568 | .poll = tipc_poll, | |
78acb1f9 | 2569 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2570 | .listen = tipc_listen, |
2571 | .shutdown = tipc_shutdown, | |
2572 | .setsockopt = tipc_setsockopt, | |
2573 | .getsockopt = tipc_getsockopt, | |
2574 | .sendmsg = tipc_send_packet, | |
2575 | .recvmsg = tipc_recvmsg, | |
8238745a YH |
2576 | .mmap = sock_no_mmap, |
2577 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2578 | }; |
2579 | ||
bca65eae | 2580 | static const struct proto_ops stream_ops = { |
0e65967e | 2581 | .owner = THIS_MODULE, |
b97bf3fd | 2582 | .family = AF_TIPC, |
247f0f3c YX |
2583 | .release = tipc_release, |
2584 | .bind = tipc_bind, | |
2585 | .connect = tipc_connect, | |
5eee6a6d | 2586 | .socketpair = sock_no_socketpair, |
247f0f3c YX |
2587 | .accept = tipc_accept, |
2588 | .getname = tipc_getname, | |
2589 | .poll = tipc_poll, | |
78acb1f9 | 2590 | .ioctl = tipc_ioctl, |
247f0f3c YX |
2591 | .listen = tipc_listen, |
2592 | .shutdown = tipc_shutdown, | |
2593 | .setsockopt = tipc_setsockopt, | |
2594 | .getsockopt = tipc_getsockopt, | |
2595 | .sendmsg = tipc_send_stream, | |
2596 | .recvmsg = tipc_recv_stream, | |
8238745a YH |
2597 | .mmap = sock_no_mmap, |
2598 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
2599 | }; |
2600 | ||
bca65eae | 2601 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 2602 | .owner = THIS_MODULE, |
b97bf3fd | 2603 | .family = AF_TIPC, |
c5fa7b3c | 2604 | .create = tipc_sk_create |
b97bf3fd PL |
2605 | }; |
2606 | ||
2607 | static struct proto tipc_proto = { | |
2608 | .name = "TIPC", | |
2609 | .owner = THIS_MODULE, | |
cc79dd1b YX |
2610 | .obj_size = sizeof(struct tipc_sock), |
2611 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2612 | }; |
2613 | ||
c5fa7b3c YX |
2614 | static struct proto tipc_proto_kern = { |
2615 | .name = "TIPC", | |
2616 | .obj_size = sizeof(struct tipc_sock), | |
2617 | .sysctl_rmem = sysctl_tipc_rmem | |
2618 | }; | |
2619 | ||
b97bf3fd | 2620 | /** |
4323add6 | 2621 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2622 | * |
b97bf3fd PL |
2623 | * Returns 0 on success, errno otherwise |
2624 | */ | |
4323add6 | 2625 | int tipc_socket_init(void) |
b97bf3fd PL |
2626 | { |
2627 | int res; | |
2628 | ||
c4307285 | 2629 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2630 | if (res) { |
2cf8aa19 | 2631 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2632 | goto out; |
2633 | } | |
2634 | ||
2635 | res = sock_register(&tipc_family_ops); | |
2636 | if (res) { | |
2cf8aa19 | 2637 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2638 | proto_unregister(&tipc_proto); |
2639 | goto out; | |
2640 | } | |
b97bf3fd PL |
2641 | out: |
2642 | return res; | |
2643 | } | |
2644 | ||
2645 | /** | |
4323add6 | 2646 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2647 | */ |
4323add6 | 2648 | void tipc_socket_stop(void) |
b97bf3fd | 2649 | { |
b97bf3fd PL |
2650 | sock_unregister(tipc_family_ops.family); |
2651 | proto_unregister(&tipc_proto); | |
2652 | } | |
34b78a12 RA |
2653 | |
2654 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 | 2655 | static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk) |
34b78a12 RA |
2656 | { |
2657 | u32 peer_node; | |
2658 | u32 peer_port; | |
2659 | struct nlattr *nest; | |
2660 | ||
2661 | peer_node = tsk_peer_node(tsk); | |
2662 | peer_port = tsk_peer_port(tsk); | |
2663 | ||
2664 | nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON); | |
2665 | ||
2666 | if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node)) | |
2667 | goto msg_full; | |
2668 | if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port)) | |
2669 | goto msg_full; | |
2670 | ||
2671 | if (tsk->conn_type != 0) { | |
2672 | if (nla_put_flag(skb, TIPC_NLA_CON_FLAG)) | |
2673 | goto msg_full; | |
2674 | if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type)) | |
2675 | goto msg_full; | |
2676 | if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance)) | |
2677 | goto msg_full; | |
2678 | } | |
2679 | nla_nest_end(skb, nest); | |
2680 | ||
2681 | return 0; | |
2682 | ||
2683 | msg_full: | |
2684 | nla_nest_cancel(skb, nest); | |
2685 | ||
2686 | return -EMSGSIZE; | |
2687 | } | |
2688 | ||
2689 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2690 | static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb, |
2691 | struct tipc_sock *tsk) | |
34b78a12 RA |
2692 | { |
2693 | int err; | |
2694 | void *hdr; | |
2695 | struct nlattr *attrs; | |
34747539 YX |
2696 | struct net *net = sock_net(skb->sk); |
2697 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
34b78a12 RA |
2698 | |
2699 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, | |
bfb3e5dd | 2700 | &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET); |
34b78a12 RA |
2701 | if (!hdr) |
2702 | goto msg_cancel; | |
2703 | ||
2704 | attrs = nla_nest_start(skb, TIPC_NLA_SOCK); | |
2705 | if (!attrs) | |
2706 | goto genlmsg_cancel; | |
07f6c4bc | 2707 | if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid)) |
34b78a12 | 2708 | goto attr_msg_cancel; |
34747539 | 2709 | if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr)) |
34b78a12 RA |
2710 | goto attr_msg_cancel; |
2711 | ||
2712 | if (tsk->connected) { | |
2713 | err = __tipc_nl_add_sk_con(skb, tsk); | |
2714 | if (err) | |
2715 | goto attr_msg_cancel; | |
2716 | } else if (!list_empty(&tsk->publications)) { | |
2717 | if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL)) | |
2718 | goto attr_msg_cancel; | |
2719 | } | |
2720 | nla_nest_end(skb, attrs); | |
2721 | genlmsg_end(skb, hdr); | |
2722 | ||
2723 | return 0; | |
2724 | ||
2725 | attr_msg_cancel: | |
2726 | nla_nest_cancel(skb, attrs); | |
2727 | genlmsg_cancel: | |
2728 | genlmsg_cancel(skb, hdr); | |
2729 | msg_cancel: | |
2730 | return -EMSGSIZE; | |
2731 | } | |
2732 | ||
2733 | int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2734 | { | |
2735 | int err; | |
2736 | struct tipc_sock *tsk; | |
07f6c4bc YX |
2737 | const struct bucket_table *tbl; |
2738 | struct rhash_head *pos; | |
e05b31f4 YX |
2739 | struct net *net = sock_net(skb->sk); |
2740 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
d6e164e3 RA |
2741 | u32 tbl_id = cb->args[0]; |
2742 | u32 prev_portid = cb->args[1]; | |
34b78a12 | 2743 | |
07f6c4bc | 2744 | rcu_read_lock(); |
e05b31f4 | 2745 | tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht); |
d6e164e3 RA |
2746 | for (; tbl_id < tbl->size; tbl_id++) { |
2747 | rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) { | |
07f6c4bc | 2748 | spin_lock_bh(&tsk->sk.sk_lock.slock); |
d6e164e3 RA |
2749 | if (prev_portid && prev_portid != tsk->portid) { |
2750 | spin_unlock_bh(&tsk->sk.sk_lock.slock); | |
2751 | continue; | |
2752 | } | |
2753 | ||
07f6c4bc | 2754 | err = __tipc_nl_add_sk(skb, cb, tsk); |
d6e164e3 RA |
2755 | if (err) { |
2756 | prev_portid = tsk->portid; | |
2757 | spin_unlock_bh(&tsk->sk.sk_lock.slock); | |
2758 | goto out; | |
2759 | } | |
2760 | prev_portid = 0; | |
07f6c4bc | 2761 | spin_unlock_bh(&tsk->sk.sk_lock.slock); |
07f6c4bc | 2762 | } |
34b78a12 | 2763 | } |
d6e164e3 | 2764 | out: |
07f6c4bc | 2765 | rcu_read_unlock(); |
d6e164e3 RA |
2766 | cb->args[0] = tbl_id; |
2767 | cb->args[1] = prev_portid; | |
34b78a12 RA |
2768 | |
2769 | return skb->len; | |
2770 | } | |
1a1a143d RA |
2771 | |
2772 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2773 | static int __tipc_nl_add_sk_publ(struct sk_buff *skb, |
2774 | struct netlink_callback *cb, | |
2775 | struct publication *publ) | |
1a1a143d RA |
2776 | { |
2777 | void *hdr; | |
2778 | struct nlattr *attrs; | |
2779 | ||
2780 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, | |
bfb3e5dd | 2781 | &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET); |
1a1a143d RA |
2782 | if (!hdr) |
2783 | goto msg_cancel; | |
2784 | ||
2785 | attrs = nla_nest_start(skb, TIPC_NLA_PUBL); | |
2786 | if (!attrs) | |
2787 | goto genlmsg_cancel; | |
2788 | ||
2789 | if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key)) | |
2790 | goto attr_msg_cancel; | |
2791 | if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type)) | |
2792 | goto attr_msg_cancel; | |
2793 | if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower)) | |
2794 | goto attr_msg_cancel; | |
2795 | if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper)) | |
2796 | goto attr_msg_cancel; | |
2797 | ||
2798 | nla_nest_end(skb, attrs); | |
2799 | genlmsg_end(skb, hdr); | |
2800 | ||
2801 | return 0; | |
2802 | ||
2803 | attr_msg_cancel: | |
2804 | nla_nest_cancel(skb, attrs); | |
2805 | genlmsg_cancel: | |
2806 | genlmsg_cancel(skb, hdr); | |
2807 | msg_cancel: | |
2808 | return -EMSGSIZE; | |
2809 | } | |
2810 | ||
2811 | /* Caller should hold socket lock for the passed tipc socket. */ | |
d8182804 RA |
2812 | static int __tipc_nl_list_sk_publ(struct sk_buff *skb, |
2813 | struct netlink_callback *cb, | |
2814 | struct tipc_sock *tsk, u32 *last_publ) | |
1a1a143d RA |
2815 | { |
2816 | int err; | |
2817 | struct publication *p; | |
2818 | ||
2819 | if (*last_publ) { | |
2820 | list_for_each_entry(p, &tsk->publications, pport_list) { | |
2821 | if (p->key == *last_publ) | |
2822 | break; | |
2823 | } | |
2824 | if (p->key != *last_publ) { | |
2825 | /* We never set seq or call nl_dump_check_consistent() | |
2826 | * this means that setting prev_seq here will cause the | |
2827 | * consistence check to fail in the netlink callback | |
2828 | * handler. Resulting in the last NLMSG_DONE message | |
2829 | * having the NLM_F_DUMP_INTR flag set. | |
2830 | */ | |
2831 | cb->prev_seq = 1; | |
2832 | *last_publ = 0; | |
2833 | return -EPIPE; | |
2834 | } | |
2835 | } else { | |
2836 | p = list_first_entry(&tsk->publications, struct publication, | |
2837 | pport_list); | |
2838 | } | |
2839 | ||
2840 | list_for_each_entry_from(p, &tsk->publications, pport_list) { | |
2841 | err = __tipc_nl_add_sk_publ(skb, cb, p); | |
2842 | if (err) { | |
2843 | *last_publ = p->key; | |
2844 | return err; | |
2845 | } | |
2846 | } | |
2847 | *last_publ = 0; | |
2848 | ||
2849 | return 0; | |
2850 | } | |
2851 | ||
2852 | int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
2853 | { | |
2854 | int err; | |
07f6c4bc | 2855 | u32 tsk_portid = cb->args[0]; |
1a1a143d RA |
2856 | u32 last_publ = cb->args[1]; |
2857 | u32 done = cb->args[2]; | |
e05b31f4 | 2858 | struct net *net = sock_net(skb->sk); |
1a1a143d RA |
2859 | struct tipc_sock *tsk; |
2860 | ||
07f6c4bc | 2861 | if (!tsk_portid) { |
1a1a143d RA |
2862 | struct nlattr **attrs; |
2863 | struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1]; | |
2864 | ||
2865 | err = tipc_nlmsg_parse(cb->nlh, &attrs); | |
2866 | if (err) | |
2867 | return err; | |
2868 | ||
2869 | err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, | |
2870 | attrs[TIPC_NLA_SOCK], | |
2871 | tipc_nl_sock_policy); | |
2872 | if (err) | |
2873 | return err; | |
2874 | ||
2875 | if (!sock[TIPC_NLA_SOCK_REF]) | |
2876 | return -EINVAL; | |
2877 | ||
07f6c4bc | 2878 | tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]); |
1a1a143d RA |
2879 | } |
2880 | ||
2881 | if (done) | |
2882 | return 0; | |
2883 | ||
e05b31f4 | 2884 | tsk = tipc_sk_lookup(net, tsk_portid); |
1a1a143d RA |
2885 | if (!tsk) |
2886 | return -EINVAL; | |
2887 | ||
2888 | lock_sock(&tsk->sk); | |
2889 | err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ); | |
2890 | if (!err) | |
2891 | done = 1; | |
2892 | release_sock(&tsk->sk); | |
07f6c4bc | 2893 | sock_put(&tsk->sk); |
1a1a143d | 2894 | |
07f6c4bc | 2895 | cb->args[0] = tsk_portid; |
1a1a143d RA |
2896 | cb->args[1] = last_publ; |
2897 | cb->args[2] = done; | |
2898 | ||
2899 | return skb->len; | |
2900 | } |