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2522fe45 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
fdda387f PC |
2 | /****************************************************************************** |
3 | ******************************************************************************* | |
4 | ** | |
5 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
5e9ccc37 | 6 | ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. |
fdda387f | 7 | ** |
fdda387f PC |
8 | ** |
9 | ******************************************************************************* | |
10 | ******************************************************************************/ | |
11 | ||
12 | /* | |
13 | * lowcomms.c | |
14 | * | |
15 | * This is the "low-level" comms layer. | |
16 | * | |
17 | * It is responsible for sending/receiving messages | |
18 | * from other nodes in the cluster. | |
19 | * | |
20 | * Cluster nodes are referred to by their nodeids. nodeids are | |
21 | * simply 32 bit numbers to the locking module - if they need to | |
2cf12c0b | 22 | * be expanded for the cluster infrastructure then that is its |
fdda387f PC |
23 | * responsibility. It is this layer's |
24 | * responsibility to resolve these into IP address or | |
25 | * whatever it needs for inter-node communication. | |
26 | * | |
27 | * The comms level is two kernel threads that deal mainly with | |
28 | * the receiving of messages from other nodes and passing them | |
29 | * up to the mid-level comms layer (which understands the | |
30 | * message format) for execution by the locking core, and | |
31 | * a send thread which does all the setting up of connections | |
32 | * to remote nodes and the sending of data. Threads are not allowed | |
33 | * to send their own data because it may cause them to wait in times | |
34 | * of high load. Also, this way, the sending thread can collect together | |
35 | * messages bound for one node and send them in one block. | |
36 | * | |
2cf12c0b | 37 | * lowcomms will choose to use either TCP or SCTP as its transport layer |
6ed7257b | 38 | * depending on the configuration variable 'protocol'. This should be set |
2cf12c0b | 39 | * to 0 (default) for TCP or 1 for SCTP. It should be configured using a |
6ed7257b PC |
40 | * cluster-wide mechanism as it must be the same on all nodes of the cluster |
41 | * for the DLM to function. | |
fdda387f PC |
42 | * |
43 | */ | |
44 | ||
fdda387f PC |
45 | #include <asm/ioctls.h> |
46 | #include <net/sock.h> | |
47 | #include <net/tcp.h> | |
48 | #include <linux/pagemap.h> | |
6ed7257b | 49 | #include <linux/file.h> |
7a936ce7 | 50 | #include <linux/mutex.h> |
6ed7257b | 51 | #include <linux/sctp.h> |
5a0e3ad6 | 52 | #include <linux/slab.h> |
2f2d76cc | 53 | #include <net/sctp/sctp.h> |
44ad532b | 54 | #include <net/ipv6.h> |
fdda387f PC |
55 | |
56 | #include "dlm_internal.h" | |
57 | #include "lowcomms.h" | |
58 | #include "midcomms.h" | |
59 | #include "config.h" | |
60 | ||
6ed7257b PC |
61 | #define NEEDED_RMEM (4*1024*1024) |
62 | ||
f92c8dd7 BP |
63 | /* Number of messages to send before rescheduling */ |
64 | #define MAX_SEND_MSG_COUNT 25 | |
055923bf | 65 | #define DLM_SHUTDOWN_WAIT_TIMEOUT msecs_to_jiffies(10000) |
f92c8dd7 | 66 | |
fdda387f PC |
67 | struct connection { |
68 | struct socket *sock; /* NULL if not connected */ | |
69 | uint32_t nodeid; /* So we know who we are in the list */ | |
f1f1c1cc | 70 | struct mutex sock_mutex; |
6ed7257b | 71 | unsigned long flags; |
fdda387f | 72 | #define CF_READ_PENDING 1 |
8a4abb08 | 73 | #define CF_WRITE_PENDING 2 |
6ed7257b PC |
74 | #define CF_INIT_PENDING 4 |
75 | #define CF_IS_OTHERCON 5 | |
063c4c99 | 76 | #define CF_CLOSE 6 |
b36930dd | 77 | #define CF_APP_LIMITED 7 |
b2a66629 | 78 | #define CF_CLOSING 8 |
055923bf | 79 | #define CF_SHUTDOWN 9 |
19633c7e | 80 | #define CF_CONNECTED 10 |
ba868d9d AA |
81 | #define CF_RECONNECT 11 |
82 | #define CF_DELAY_CONNECT 12 | |
8aa31cbf | 83 | #define CF_EOF 13 |
ac33d071 | 84 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
fdda387f | 85 | spinlock_t writequeue_lock; |
8aa31cbf | 86 | atomic_t writequeue_cnt; |
c51b0221 | 87 | struct mutex wq_alloc; |
fdda387f | 88 | int retries; |
fdda387f | 89 | #define MAX_CONNECT_RETRIES 3 |
5e9ccc37 | 90 | struct hlist_node list; |
fdda387f | 91 | struct connection *othercon; |
ba868d9d | 92 | struct connection *sendcon; |
1d6e8131 PC |
93 | struct work_struct rwork; /* Receive workqueue */ |
94 | struct work_struct swork; /* Send workqueue */ | |
055923bf | 95 | wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ |
4798cbbf AA |
96 | unsigned char *rx_buf; |
97 | int rx_buflen; | |
98 | int rx_leftover; | |
a47666eb | 99 | struct rcu_head rcu; |
fdda387f PC |
100 | }; |
101 | #define sock2con(x) ((struct connection *)(x)->sk_user_data) | |
102 | ||
d11ccd45 AA |
103 | struct listen_connection { |
104 | struct socket *sock; | |
105 | struct work_struct rwork; | |
106 | }; | |
107 | ||
f0747ebf AA |
108 | #define DLM_WQ_REMAIN_BYTES(e) (PAGE_SIZE - e->end) |
109 | #define DLM_WQ_LENGTH_BYTES(e) (e->end - e->offset) | |
110 | ||
fdda387f PC |
111 | /* An entry waiting to be sent */ |
112 | struct writequeue_entry { | |
113 | struct list_head list; | |
114 | struct page *page; | |
115 | int offset; | |
116 | int len; | |
117 | int end; | |
118 | int users; | |
706474fb | 119 | bool dirty; |
fdda387f | 120 | struct connection *con; |
8f2dc78d AA |
121 | struct list_head msgs; |
122 | struct kref ref; | |
123 | }; | |
124 | ||
125 | struct dlm_msg { | |
126 | struct writequeue_entry *entry; | |
2874d1a6 AA |
127 | struct dlm_msg *orig_msg; |
128 | bool retransmit; | |
8f2dc78d AA |
129 | void *ppc; |
130 | int len; | |
131 | int idx; /* new()/commit() idx exchange */ | |
132 | ||
133 | struct list_head list; | |
134 | struct kref ref; | |
fdda387f PC |
135 | }; |
136 | ||
36b71a8b DT |
137 | struct dlm_node_addr { |
138 | struct list_head list; | |
139 | int nodeid; | |
e125fbeb | 140 | int mark; |
36b71a8b | 141 | int addr_count; |
98e1b60e | 142 | int curr_addr_index; |
36b71a8b DT |
143 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
144 | }; | |
145 | ||
a66c008c | 146 | struct dlm_proto_ops { |
8728a455 | 147 | bool try_new_addr; |
2dc6b115 AA |
148 | const char *name; |
149 | int proto; | |
150 | ||
8728a455 AA |
151 | int (*connect)(struct connection *con, struct socket *sock, |
152 | struct sockaddr *addr, int addr_len); | |
153 | void (*sockopts)(struct socket *sock); | |
154 | int (*bind)(struct socket *sock); | |
2dc6b115 AA |
155 | int (*listen_validate)(void); |
156 | void (*listen_sockopts)(struct socket *sock); | |
157 | int (*listen_bind)(struct socket *sock); | |
a66c008c AA |
158 | /* What to do to shutdown */ |
159 | void (*shutdown_action)(struct connection *con); | |
160 | /* What to do to eof check */ | |
161 | bool (*eof_condition)(struct connection *con); | |
162 | }; | |
163 | ||
cc661fc9 BP |
164 | static struct listen_sock_callbacks { |
165 | void (*sk_error_report)(struct sock *); | |
166 | void (*sk_data_ready)(struct sock *); | |
167 | void (*sk_state_change)(struct sock *); | |
168 | void (*sk_write_space)(struct sock *); | |
169 | } listen_sock; | |
170 | ||
36b71a8b DT |
171 | static LIST_HEAD(dlm_node_addrs); |
172 | static DEFINE_SPINLOCK(dlm_node_addrs_spin); | |
173 | ||
d11ccd45 | 174 | static struct listen_connection listen_con; |
6ed7257b PC |
175 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
176 | static int dlm_local_count; | |
51746163 | 177 | int dlm_allow_conn; |
fdda387f | 178 | |
1d6e8131 PC |
179 | /* Work queues */ |
180 | static struct workqueue_struct *recv_workqueue; | |
181 | static struct workqueue_struct *send_workqueue; | |
fdda387f | 182 | |
5e9ccc37 | 183 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
a47666eb AA |
184 | static DEFINE_SPINLOCK(connections_lock); |
185 | DEFINE_STATIC_SRCU(connections_srcu); | |
fdda387f | 186 | |
a66c008c AA |
187 | static const struct dlm_proto_ops *dlm_proto_ops; |
188 | ||
1d6e8131 PC |
189 | static void process_recv_sockets(struct work_struct *work); |
190 | static void process_send_sockets(struct work_struct *work); | |
fdda387f | 191 | |
66d5955a AA |
192 | /* need to held writequeue_lock */ |
193 | static struct writequeue_entry *con_next_wq(struct connection *con) | |
194 | { | |
195 | struct writequeue_entry *e; | |
196 | ||
197 | if (list_empty(&con->writequeue)) | |
198 | return NULL; | |
199 | ||
200 | e = list_first_entry(&con->writequeue, struct writequeue_entry, | |
201 | list); | |
202 | if (e->len == 0) | |
203 | return NULL; | |
204 | ||
205 | return e; | |
206 | } | |
207 | ||
b38bc9c2 | 208 | static struct connection *__find_con(int nodeid, int r) |
5e9ccc37 | 209 | { |
5e9ccc37 CC |
210 | struct connection *con; |
211 | ||
a47666eb | 212 | hlist_for_each_entry_rcu(con, &connection_hash[r], list) { |
b38bc9c2 | 213 | if (con->nodeid == nodeid) |
5e9ccc37 CC |
214 | return con; |
215 | } | |
a47666eb | 216 | |
5e9ccc37 CC |
217 | return NULL; |
218 | } | |
219 | ||
8aa31cbf AA |
220 | static bool tcp_eof_condition(struct connection *con) |
221 | { | |
222 | return atomic_read(&con->writequeue_cnt); | |
223 | } | |
224 | ||
6cde210a | 225 | static int dlm_con_init(struct connection *con, int nodeid) |
fdda387f | 226 | { |
4798cbbf AA |
227 | con->rx_buflen = dlm_config.ci_buffer_size; |
228 | con->rx_buf = kmalloc(con->rx_buflen, GFP_NOFS); | |
6cde210a AA |
229 | if (!con->rx_buf) |
230 | return -ENOMEM; | |
4798cbbf | 231 | |
6ed7257b PC |
232 | con->nodeid = nodeid; |
233 | mutex_init(&con->sock_mutex); | |
234 | INIT_LIST_HEAD(&con->writequeue); | |
235 | spin_lock_init(&con->writequeue_lock); | |
8aa31cbf | 236 | atomic_set(&con->writequeue_cnt, 0); |
6ed7257b PC |
237 | INIT_WORK(&con->swork, process_send_sockets); |
238 | INIT_WORK(&con->rwork, process_recv_sockets); | |
055923bf | 239 | init_waitqueue_head(&con->shutdown_wait); |
fdda387f | 240 | |
6cde210a AA |
241 | return 0; |
242 | } | |
243 | ||
244 | /* | |
245 | * If 'allocation' is zero then we don't attempt to create a new | |
246 | * connection structure for this node. | |
247 | */ | |
248 | static struct connection *nodeid2con(int nodeid, gfp_t alloc) | |
249 | { | |
250 | struct connection *con, *tmp; | |
251 | int r, ret; | |
252 | ||
b38bc9c2 AA |
253 | r = nodeid_hash(nodeid); |
254 | con = __find_con(nodeid, r); | |
6cde210a AA |
255 | if (con || !alloc) |
256 | return con; | |
257 | ||
258 | con = kzalloc(sizeof(*con), alloc); | |
259 | if (!con) | |
260 | return NULL; | |
261 | ||
262 | ret = dlm_con_init(con, nodeid); | |
263 | if (ret) { | |
264 | kfree(con); | |
265 | return NULL; | |
266 | } | |
267 | ||
c51b0221 AA |
268 | mutex_init(&con->wq_alloc); |
269 | ||
a47666eb | 270 | spin_lock(&connections_lock); |
4f2b30fd AA |
271 | /* Because multiple workqueues/threads calls this function it can |
272 | * race on multiple cpu's. Instead of locking hot path __find_con() | |
273 | * we just check in rare cases of recently added nodes again | |
274 | * under protection of connections_lock. If this is the case we | |
275 | * abort our connection creation and return the existing connection. | |
276 | */ | |
b38bc9c2 | 277 | tmp = __find_con(nodeid, r); |
4f2b30fd AA |
278 | if (tmp) { |
279 | spin_unlock(&connections_lock); | |
280 | kfree(con->rx_buf); | |
281 | kfree(con); | |
282 | return tmp; | |
283 | } | |
284 | ||
a47666eb AA |
285 | hlist_add_head_rcu(&con->list, &connection_hash[r]); |
286 | spin_unlock(&connections_lock); | |
287 | ||
6ed7257b PC |
288 | return con; |
289 | } | |
290 | ||
5e9ccc37 CC |
291 | /* Loop round all connections */ |
292 | static void foreach_conn(void (*conn_func)(struct connection *c)) | |
293 | { | |
b38bc9c2 | 294 | int i; |
5e9ccc37 CC |
295 | struct connection *con; |
296 | ||
297 | for (i = 0; i < CONN_HASH_SIZE; i++) { | |
a47666eb | 298 | hlist_for_each_entry_rcu(con, &connection_hash[i], list) |
5e9ccc37 | 299 | conn_func(con); |
5e9ccc37 | 300 | } |
fdda387f PC |
301 | } |
302 | ||
36b71a8b DT |
303 | static struct dlm_node_addr *find_node_addr(int nodeid) |
304 | { | |
305 | struct dlm_node_addr *na; | |
306 | ||
307 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
308 | if (na->nodeid == nodeid) | |
309 | return na; | |
310 | } | |
311 | return NULL; | |
312 | } | |
313 | ||
40c6b83e AA |
314 | static int addr_compare(const struct sockaddr_storage *x, |
315 | const struct sockaddr_storage *y) | |
6ed7257b | 316 | { |
36b71a8b DT |
317 | switch (x->ss_family) { |
318 | case AF_INET: { | |
319 | struct sockaddr_in *sinx = (struct sockaddr_in *)x; | |
320 | struct sockaddr_in *siny = (struct sockaddr_in *)y; | |
321 | if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) | |
322 | return 0; | |
323 | if (sinx->sin_port != siny->sin_port) | |
324 | return 0; | |
325 | break; | |
326 | } | |
327 | case AF_INET6: { | |
328 | struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; | |
329 | struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; | |
330 | if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) | |
331 | return 0; | |
332 | if (sinx->sin6_port != siny->sin6_port) | |
333 | return 0; | |
334 | break; | |
335 | } | |
336 | default: | |
337 | return 0; | |
338 | } | |
339 | return 1; | |
340 | } | |
341 | ||
342 | static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, | |
e125fbeb AA |
343 | struct sockaddr *sa_out, bool try_new_addr, |
344 | unsigned int *mark) | |
36b71a8b DT |
345 | { |
346 | struct sockaddr_storage sas; | |
347 | struct dlm_node_addr *na; | |
6ed7257b PC |
348 | |
349 | if (!dlm_local_count) | |
350 | return -1; | |
351 | ||
36b71a8b DT |
352 | spin_lock(&dlm_node_addrs_spin); |
353 | na = find_node_addr(nodeid); | |
98e1b60e | 354 | if (na && na->addr_count) { |
ee44b4bc MRL |
355 | memcpy(&sas, na->addr[na->curr_addr_index], |
356 | sizeof(struct sockaddr_storage)); | |
357 | ||
98e1b60e MC |
358 | if (try_new_addr) { |
359 | na->curr_addr_index++; | |
360 | if (na->curr_addr_index == na->addr_count) | |
361 | na->curr_addr_index = 0; | |
362 | } | |
98e1b60e | 363 | } |
36b71a8b DT |
364 | spin_unlock(&dlm_node_addrs_spin); |
365 | ||
366 | if (!na) | |
367 | return -EEXIST; | |
368 | ||
369 | if (!na->addr_count) | |
370 | return -ENOENT; | |
371 | ||
e125fbeb AA |
372 | *mark = na->mark; |
373 | ||
36b71a8b DT |
374 | if (sas_out) |
375 | memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); | |
376 | ||
377 | if (!sa_out) | |
378 | return 0; | |
6ed7257b PC |
379 | |
380 | if (dlm_local_addr[0]->ss_family == AF_INET) { | |
36b71a8b DT |
381 | struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; |
382 | struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; | |
6ed7257b PC |
383 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; |
384 | } else { | |
36b71a8b DT |
385 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; |
386 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; | |
4e3fd7a0 | 387 | ret6->sin6_addr = in6->sin6_addr; |
6ed7257b PC |
388 | } |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
e125fbeb AA |
393 | static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid, |
394 | unsigned int *mark) | |
36b71a8b DT |
395 | { |
396 | struct dlm_node_addr *na; | |
397 | int rv = -EEXIST; | |
98e1b60e | 398 | int addr_i; |
36b71a8b DT |
399 | |
400 | spin_lock(&dlm_node_addrs_spin); | |
401 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
402 | if (!na->addr_count) | |
403 | continue; | |
404 | ||
98e1b60e MC |
405 | for (addr_i = 0; addr_i < na->addr_count; addr_i++) { |
406 | if (addr_compare(na->addr[addr_i], addr)) { | |
407 | *nodeid = na->nodeid; | |
e125fbeb | 408 | *mark = na->mark; |
98e1b60e MC |
409 | rv = 0; |
410 | goto unlock; | |
411 | } | |
412 | } | |
36b71a8b | 413 | } |
98e1b60e | 414 | unlock: |
36b71a8b DT |
415 | spin_unlock(&dlm_node_addrs_spin); |
416 | return rv; | |
417 | } | |
418 | ||
4f19d071 AA |
419 | /* caller need to held dlm_node_addrs_spin lock */ |
420 | static bool dlm_lowcomms_na_has_addr(const struct dlm_node_addr *na, | |
421 | const struct sockaddr_storage *addr) | |
422 | { | |
423 | int i; | |
424 | ||
425 | for (i = 0; i < na->addr_count; i++) { | |
426 | if (addr_compare(na->addr[i], addr)) | |
427 | return true; | |
428 | } | |
429 | ||
430 | return false; | |
431 | } | |
432 | ||
36b71a8b DT |
433 | int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) |
434 | { | |
435 | struct sockaddr_storage *new_addr; | |
436 | struct dlm_node_addr *new_node, *na; | |
4f19d071 | 437 | bool ret; |
36b71a8b DT |
438 | |
439 | new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); | |
440 | if (!new_node) | |
441 | return -ENOMEM; | |
442 | ||
443 | new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); | |
444 | if (!new_addr) { | |
445 | kfree(new_node); | |
446 | return -ENOMEM; | |
447 | } | |
448 | ||
449 | memcpy(new_addr, addr, len); | |
450 | ||
451 | spin_lock(&dlm_node_addrs_spin); | |
452 | na = find_node_addr(nodeid); | |
453 | if (!na) { | |
454 | new_node->nodeid = nodeid; | |
455 | new_node->addr[0] = new_addr; | |
456 | new_node->addr_count = 1; | |
e125fbeb | 457 | new_node->mark = dlm_config.ci_mark; |
36b71a8b DT |
458 | list_add(&new_node->list, &dlm_node_addrs); |
459 | spin_unlock(&dlm_node_addrs_spin); | |
460 | return 0; | |
461 | } | |
462 | ||
4f19d071 AA |
463 | ret = dlm_lowcomms_na_has_addr(na, addr); |
464 | if (ret) { | |
465 | spin_unlock(&dlm_node_addrs_spin); | |
466 | kfree(new_addr); | |
467 | kfree(new_node); | |
468 | return -EEXIST; | |
469 | } | |
470 | ||
36b71a8b DT |
471 | if (na->addr_count >= DLM_MAX_ADDR_COUNT) { |
472 | spin_unlock(&dlm_node_addrs_spin); | |
473 | kfree(new_addr); | |
474 | kfree(new_node); | |
475 | return -ENOSPC; | |
476 | } | |
477 | ||
478 | na->addr[na->addr_count++] = new_addr; | |
479 | spin_unlock(&dlm_node_addrs_spin); | |
480 | kfree(new_node); | |
481 | return 0; | |
482 | } | |
483 | ||
fdda387f | 484 | /* Data available on socket or listen socket received a connect */ |
676d2369 | 485 | static void lowcomms_data_ready(struct sock *sk) |
fdda387f | 486 | { |
93eaadeb | 487 | struct connection *con; |
488 | ||
489 | read_lock_bh(&sk->sk_callback_lock); | |
490 | con = sock2con(sk); | |
afb853fb | 491 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
1d6e8131 | 492 | queue_work(recv_workqueue, &con->rwork); |
93eaadeb | 493 | read_unlock_bh(&sk->sk_callback_lock); |
fdda387f PC |
494 | } |
495 | ||
d11ccd45 AA |
496 | static void lowcomms_listen_data_ready(struct sock *sk) |
497 | { | |
9a4139a7 AA |
498 | if (!dlm_allow_conn) |
499 | return; | |
500 | ||
d11ccd45 AA |
501 | queue_work(recv_workqueue, &listen_con.rwork); |
502 | } | |
503 | ||
fdda387f PC |
504 | static void lowcomms_write_space(struct sock *sk) |
505 | { | |
93eaadeb | 506 | struct connection *con; |
fdda387f | 507 | |
93eaadeb | 508 | read_lock_bh(&sk->sk_callback_lock); |
509 | con = sock2con(sk); | |
b36930dd | 510 | if (!con) |
93eaadeb | 511 | goto out; |
b36930dd | 512 | |
19633c7e AA |
513 | if (!test_and_set_bit(CF_CONNECTED, &con->flags)) { |
514 | log_print("successful connected to node %d", con->nodeid); | |
515 | queue_work(send_workqueue, &con->swork); | |
516 | goto out; | |
517 | } | |
518 | ||
b36930dd DM |
519 | clear_bit(SOCK_NOSPACE, &con->sock->flags); |
520 | ||
521 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { | |
522 | con->sock->sk->sk_write_pending--; | |
9cd3e072 | 523 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); |
b36930dd DM |
524 | } |
525 | ||
01da24d3 | 526 | queue_work(send_workqueue, &con->swork); |
93eaadeb | 527 | out: |
528 | read_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
529 | } |
530 | ||
531 | static inline void lowcomms_connect_sock(struct connection *con) | |
532 | { | |
063c4c99 LMB |
533 | if (test_bit(CF_CLOSE, &con->flags)) |
534 | return; | |
61d9102b BP |
535 | queue_work(send_workqueue, &con->swork); |
536 | cond_resched(); | |
fdda387f PC |
537 | } |
538 | ||
539 | static void lowcomms_state_change(struct sock *sk) | |
540 | { | |
ee44b4bc MRL |
541 | /* SCTP layer is not calling sk_data_ready when the connection |
542 | * is done, so we catch the signal through here. Also, it | |
543 | * doesn't switch socket state when entering shutdown, so we | |
544 | * skip the write in that case. | |
545 | */ | |
546 | if (sk->sk_shutdown) { | |
547 | if (sk->sk_shutdown == RCV_SHUTDOWN) | |
548 | lowcomms_data_ready(sk); | |
549 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
fdda387f | 550 | lowcomms_write_space(sk); |
ee44b4bc | 551 | } |
fdda387f PC |
552 | } |
553 | ||
391fbdc5 CC |
554 | int dlm_lowcomms_connect_node(int nodeid) |
555 | { | |
556 | struct connection *con; | |
b38bc9c2 | 557 | int idx; |
391fbdc5 CC |
558 | |
559 | if (nodeid == dlm_our_nodeid()) | |
560 | return 0; | |
561 | ||
b38bc9c2 | 562 | idx = srcu_read_lock(&connections_srcu); |
391fbdc5 | 563 | con = nodeid2con(nodeid, GFP_NOFS); |
b38bc9c2 AA |
564 | if (!con) { |
565 | srcu_read_unlock(&connections_srcu, idx); | |
391fbdc5 | 566 | return -ENOMEM; |
b38bc9c2 AA |
567 | } |
568 | ||
391fbdc5 | 569 | lowcomms_connect_sock(con); |
b38bc9c2 AA |
570 | srcu_read_unlock(&connections_srcu, idx); |
571 | ||
391fbdc5 CC |
572 | return 0; |
573 | } | |
574 | ||
e125fbeb AA |
575 | int dlm_lowcomms_nodes_set_mark(int nodeid, unsigned int mark) |
576 | { | |
577 | struct dlm_node_addr *na; | |
578 | ||
579 | spin_lock(&dlm_node_addrs_spin); | |
580 | na = find_node_addr(nodeid); | |
581 | if (!na) { | |
582 | spin_unlock(&dlm_node_addrs_spin); | |
583 | return -ENOENT; | |
584 | } | |
585 | ||
586 | na->mark = mark; | |
587 | spin_unlock(&dlm_node_addrs_spin); | |
588 | ||
589 | return 0; | |
590 | } | |
591 | ||
b3a5bbfd BP |
592 | static void lowcomms_error_report(struct sock *sk) |
593 | { | |
b81171cb | 594 | struct connection *con; |
b3a5bbfd | 595 | struct sockaddr_storage saddr; |
b81171cb | 596 | void (*orig_report)(struct sock *) = NULL; |
b3a5bbfd | 597 | |
b81171cb BP |
598 | read_lock_bh(&sk->sk_callback_lock); |
599 | con = sock2con(sk); | |
600 | if (con == NULL) | |
601 | goto out; | |
602 | ||
cc661fc9 | 603 | orig_report = listen_sock.sk_error_report; |
feb704bd | 604 | if (kernel_getpeername(sk->sk_socket, (struct sockaddr *)&saddr) < 0) { |
b3a5bbfd BP |
605 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " |
606 | "sending to node %d, port %d, " | |
607 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
608 | con->nodeid, dlm_config.ci_tcp_port, | |
609 | sk->sk_err, sk->sk_err_soft); | |
b3a5bbfd BP |
610 | } else if (saddr.ss_family == AF_INET) { |
611 | struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; | |
612 | ||
613 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
614 | "sending to node %d at %pI4, port %d, " | |
615 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
616 | con->nodeid, &sin4->sin_addr.s_addr, | |
617 | dlm_config.ci_tcp_port, sk->sk_err, | |
618 | sk->sk_err_soft); | |
619 | } else { | |
620 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; | |
621 | ||
622 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
623 | "sending to node %d at %u.%u.%u.%u, " | |
624 | "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), | |
625 | con->nodeid, sin6->sin6_addr.s6_addr32[0], | |
626 | sin6->sin6_addr.s6_addr32[1], | |
627 | sin6->sin6_addr.s6_addr32[2], | |
628 | sin6->sin6_addr.s6_addr32[3], | |
629 | dlm_config.ci_tcp_port, sk->sk_err, | |
630 | sk->sk_err_soft); | |
631 | } | |
ba868d9d AA |
632 | |
633 | /* below sendcon only handling */ | |
634 | if (test_bit(CF_IS_OTHERCON, &con->flags)) | |
635 | con = con->sendcon; | |
636 | ||
637 | switch (sk->sk_err) { | |
638 | case ECONNREFUSED: | |
639 | set_bit(CF_DELAY_CONNECT, &con->flags); | |
640 | break; | |
641 | default: | |
642 | break; | |
643 | } | |
644 | ||
645 | if (!test_and_set_bit(CF_RECONNECT, &con->flags)) | |
646 | queue_work(send_workqueue, &con->swork); | |
647 | ||
b81171cb BP |
648 | out: |
649 | read_unlock_bh(&sk->sk_callback_lock); | |
650 | if (orig_report) | |
651 | orig_report(sk); | |
652 | } | |
653 | ||
654 | /* Note: sk_callback_lock must be locked before calling this function. */ | |
cc661fc9 | 655 | static void save_listen_callbacks(struct socket *sock) |
b81171cb | 656 | { |
cc661fc9 BP |
657 | struct sock *sk = sock->sk; |
658 | ||
659 | listen_sock.sk_data_ready = sk->sk_data_ready; | |
660 | listen_sock.sk_state_change = sk->sk_state_change; | |
661 | listen_sock.sk_write_space = sk->sk_write_space; | |
662 | listen_sock.sk_error_report = sk->sk_error_report; | |
b81171cb BP |
663 | } |
664 | ||
cc661fc9 | 665 | static void restore_callbacks(struct socket *sock) |
b81171cb | 666 | { |
cc661fc9 BP |
667 | struct sock *sk = sock->sk; |
668 | ||
b81171cb | 669 | write_lock_bh(&sk->sk_callback_lock); |
b81171cb | 670 | sk->sk_user_data = NULL; |
cc661fc9 BP |
671 | sk->sk_data_ready = listen_sock.sk_data_ready; |
672 | sk->sk_state_change = listen_sock.sk_state_change; | |
673 | sk->sk_write_space = listen_sock.sk_write_space; | |
674 | sk->sk_error_report = listen_sock.sk_error_report; | |
b81171cb | 675 | write_unlock_bh(&sk->sk_callback_lock); |
b3a5bbfd BP |
676 | } |
677 | ||
d11ccd45 AA |
678 | static void add_listen_sock(struct socket *sock, struct listen_connection *con) |
679 | { | |
680 | struct sock *sk = sock->sk; | |
681 | ||
682 | write_lock_bh(&sk->sk_callback_lock); | |
683 | save_listen_callbacks(sock); | |
684 | con->sock = sock; | |
685 | ||
686 | sk->sk_user_data = con; | |
687 | sk->sk_allocation = GFP_NOFS; | |
688 | /* Install a data_ready callback */ | |
689 | sk->sk_data_ready = lowcomms_listen_data_ready; | |
690 | write_unlock_bh(&sk->sk_callback_lock); | |
691 | } | |
692 | ||
fdda387f | 693 | /* Make a socket active */ |
988419a9 | 694 | static void add_sock(struct socket *sock, struct connection *con) |
fdda387f | 695 | { |
b81171cb BP |
696 | struct sock *sk = sock->sk; |
697 | ||
698 | write_lock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
699 | con->sock = sock; |
700 | ||
b81171cb | 701 | sk->sk_user_data = con; |
fdda387f | 702 | /* Install a data_ready callback */ |
b81171cb BP |
703 | sk->sk_data_ready = lowcomms_data_ready; |
704 | sk->sk_write_space = lowcomms_write_space; | |
705 | sk->sk_state_change = lowcomms_state_change; | |
706 | sk->sk_allocation = GFP_NOFS; | |
707 | sk->sk_error_report = lowcomms_error_report; | |
708 | write_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
709 | } |
710 | ||
6ed7257b | 711 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
fdda387f PC |
712 | length */ |
713 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, | |
714 | int *addr_len) | |
715 | { | |
6ed7257b | 716 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
ac33d071 | 717 | if (saddr->ss_family == AF_INET) { |
fdda387f PC |
718 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
719 | in4_addr->sin_port = cpu_to_be16(port); | |
720 | *addr_len = sizeof(struct sockaddr_in); | |
6ed7257b | 721 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
ac33d071 | 722 | } else { |
fdda387f PC |
723 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
724 | in6_addr->sin6_port = cpu_to_be16(port); | |
725 | *addr_len = sizeof(struct sockaddr_in6); | |
726 | } | |
01c8cab2 | 727 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
fdda387f PC |
728 | } |
729 | ||
706474fb AA |
730 | static void dlm_page_release(struct kref *kref) |
731 | { | |
732 | struct writequeue_entry *e = container_of(kref, struct writequeue_entry, | |
733 | ref); | |
734 | ||
735 | __free_page(e->page); | |
736 | kfree(e); | |
737 | } | |
738 | ||
739 | static void dlm_msg_release(struct kref *kref) | |
740 | { | |
741 | struct dlm_msg *msg = container_of(kref, struct dlm_msg, ref); | |
742 | ||
743 | kref_put(&msg->entry->ref, dlm_page_release); | |
744 | kfree(msg); | |
745 | } | |
746 | ||
747 | static void free_entry(struct writequeue_entry *e) | |
748 | { | |
749 | struct dlm_msg *msg, *tmp; | |
750 | ||
751 | list_for_each_entry_safe(msg, tmp, &e->msgs, list) { | |
752 | if (msg->orig_msg) { | |
753 | msg->orig_msg->retransmit = false; | |
754 | kref_put(&msg->orig_msg->ref, dlm_msg_release); | |
755 | } | |
756 | ||
757 | list_del(&msg->list); | |
758 | kref_put(&msg->ref, dlm_msg_release); | |
759 | } | |
760 | ||
761 | list_del(&e->list); | |
762 | atomic_dec(&e->con->writequeue_cnt); | |
763 | kref_put(&e->ref, dlm_page_release); | |
764 | } | |
765 | ||
d11ccd45 AA |
766 | static void dlm_close_sock(struct socket **sock) |
767 | { | |
768 | if (*sock) { | |
769 | restore_callbacks(*sock); | |
770 | sock_release(*sock); | |
771 | *sock = NULL; | |
772 | } | |
773 | } | |
774 | ||
fdda387f | 775 | /* Close a remote connection and tidy up */ |
0d737a8c MRL |
776 | static void close_connection(struct connection *con, bool and_other, |
777 | bool tx, bool rx) | |
fdda387f | 778 | { |
b2a66629 | 779 | bool closing = test_and_set_bit(CF_CLOSING, &con->flags); |
706474fb | 780 | struct writequeue_entry *e; |
b2a66629 | 781 | |
0aa18464 | 782 | if (tx && !closing && cancel_work_sync(&con->swork)) { |
0d737a8c | 783 | log_print("canceled swork for node %d", con->nodeid); |
0aa18464 | 784 | clear_bit(CF_WRITE_PENDING, &con->flags); |
785 | } | |
786 | if (rx && !closing && cancel_work_sync(&con->rwork)) { | |
0d737a8c | 787 | log_print("canceled rwork for node %d", con->nodeid); |
0aa18464 | 788 | clear_bit(CF_READ_PENDING, &con->flags); |
789 | } | |
fdda387f | 790 | |
0d737a8c | 791 | mutex_lock(&con->sock_mutex); |
d11ccd45 AA |
792 | dlm_close_sock(&con->sock); |
793 | ||
fdda387f | 794 | if (con->othercon && and_other) { |
ac33d071 | 795 | /* Will only re-enter once. */ |
c6aa00e3 | 796 | close_connection(con->othercon, false, tx, rx); |
fdda387f | 797 | } |
9e5f2825 | 798 | |
706474fb AA |
799 | /* if we send a writequeue entry only a half way, we drop the |
800 | * whole entry because reconnection and that we not start of the | |
801 | * middle of a msg which will confuse the other end. | |
802 | * | |
803 | * we can always drop messages because retransmits, but what we | |
804 | * cannot allow is to transmit half messages which may be processed | |
805 | * at the other side. | |
806 | * | |
807 | * our policy is to start on a clean state when disconnects, we don't | |
808 | * know what's send/received on transport layer in this case. | |
809 | */ | |
810 | spin_lock(&con->writequeue_lock); | |
811 | if (!list_empty(&con->writequeue)) { | |
812 | e = list_first_entry(&con->writequeue, struct writequeue_entry, | |
813 | list); | |
814 | if (e->dirty) | |
815 | free_entry(e); | |
816 | } | |
817 | spin_unlock(&con->writequeue_lock); | |
818 | ||
4798cbbf | 819 | con->rx_leftover = 0; |
61d96be0 | 820 | con->retries = 0; |
052849be | 821 | clear_bit(CF_APP_LIMITED, &con->flags); |
19633c7e | 822 | clear_bit(CF_CONNECTED, &con->flags); |
ba868d9d AA |
823 | clear_bit(CF_DELAY_CONNECT, &con->flags); |
824 | clear_bit(CF_RECONNECT, &con->flags); | |
8aa31cbf | 825 | clear_bit(CF_EOF, &con->flags); |
61d96be0 | 826 | mutex_unlock(&con->sock_mutex); |
b2a66629 | 827 | clear_bit(CF_CLOSING, &con->flags); |
fdda387f PC |
828 | } |
829 | ||
055923bf AA |
830 | static void shutdown_connection(struct connection *con) |
831 | { | |
832 | int ret; | |
833 | ||
eec054b5 | 834 | flush_work(&con->swork); |
055923bf AA |
835 | |
836 | mutex_lock(&con->sock_mutex); | |
837 | /* nothing to shutdown */ | |
838 | if (!con->sock) { | |
839 | mutex_unlock(&con->sock_mutex); | |
840 | return; | |
841 | } | |
842 | ||
843 | set_bit(CF_SHUTDOWN, &con->flags); | |
844 | ret = kernel_sock_shutdown(con->sock, SHUT_WR); | |
845 | mutex_unlock(&con->sock_mutex); | |
846 | if (ret) { | |
847 | log_print("Connection %p failed to shutdown: %d will force close", | |
848 | con, ret); | |
849 | goto force_close; | |
850 | } else { | |
851 | ret = wait_event_timeout(con->shutdown_wait, | |
852 | !test_bit(CF_SHUTDOWN, &con->flags), | |
853 | DLM_SHUTDOWN_WAIT_TIMEOUT); | |
854 | if (ret == 0) { | |
855 | log_print("Connection %p shutdown timed out, will force close", | |
856 | con); | |
857 | goto force_close; | |
858 | } | |
859 | } | |
860 | ||
861 | return; | |
862 | ||
863 | force_close: | |
864 | clear_bit(CF_SHUTDOWN, &con->flags); | |
865 | close_connection(con, false, true, true); | |
866 | } | |
867 | ||
868 | static void dlm_tcp_shutdown(struct connection *con) | |
869 | { | |
870 | if (con->othercon) | |
871 | shutdown_connection(con->othercon); | |
872 | shutdown_connection(con); | |
873 | } | |
874 | ||
4798cbbf AA |
875 | static int con_realloc_receive_buf(struct connection *con, int newlen) |
876 | { | |
877 | unsigned char *newbuf; | |
878 | ||
879 | newbuf = kmalloc(newlen, GFP_NOFS); | |
880 | if (!newbuf) | |
881 | return -ENOMEM; | |
882 | ||
883 | /* copy any leftover from last receive */ | |
884 | if (con->rx_leftover) | |
885 | memmove(newbuf, con->rx_buf, con->rx_leftover); | |
886 | ||
887 | /* swap to new buffer space */ | |
888 | kfree(con->rx_buf); | |
889 | con->rx_buflen = newlen; | |
890 | con->rx_buf = newbuf; | |
891 | ||
892 | return 0; | |
893 | } | |
894 | ||
fdda387f PC |
895 | /* Data received from remote end */ |
896 | static int receive_from_sock(struct connection *con) | |
897 | { | |
4798cbbf AA |
898 | struct msghdr msg; |
899 | struct kvec iov; | |
900 | int ret, buflen; | |
fdda387f | 901 | |
f1f1c1cc | 902 | mutex_lock(&con->sock_mutex); |
fdda387f | 903 | |
a34fbc63 PC |
904 | if (con->sock == NULL) { |
905 | ret = -EAGAIN; | |
906 | goto out_close; | |
907 | } | |
4798cbbf | 908 | |
4798cbbf AA |
909 | /* realloc if we get new buffer size to read out */ |
910 | buflen = dlm_config.ci_buffer_size; | |
911 | if (con->rx_buflen != buflen && con->rx_leftover <= buflen) { | |
912 | ret = con_realloc_receive_buf(con, buflen); | |
913 | if (ret < 0) | |
fdda387f | 914 | goto out_resched; |
fdda387f PC |
915 | } |
916 | ||
62699b3f AA |
917 | for (;;) { |
918 | /* calculate new buffer parameter regarding last receive and | |
919 | * possible leftover bytes | |
920 | */ | |
921 | iov.iov_base = con->rx_buf + con->rx_leftover; | |
922 | iov.iov_len = con->rx_buflen - con->rx_leftover; | |
923 | ||
924 | memset(&msg, 0, sizeof(msg)); | |
925 | msg.msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; | |
926 | ret = kernel_recvmsg(con->sock, &msg, &iov, 1, iov.iov_len, | |
927 | msg.msg_flags); | |
928 | if (ret == -EAGAIN) | |
929 | break; | |
930 | else if (ret <= 0) | |
931 | goto out_close; | |
fdda387f | 932 | |
62699b3f AA |
933 | /* new buflen according readed bytes and leftover from last receive */ |
934 | buflen = ret + con->rx_leftover; | |
935 | ret = dlm_process_incoming_buffer(con->nodeid, con->rx_buf, buflen); | |
936 | if (ret < 0) | |
937 | goto out_close; | |
938 | ||
939 | /* calculate leftover bytes from process and put it into begin of | |
940 | * the receive buffer, so next receive we have the full message | |
941 | * at the start address of the receive buffer. | |
942 | */ | |
943 | con->rx_leftover = buflen - ret; | |
944 | if (con->rx_leftover) { | |
945 | memmove(con->rx_buf, con->rx_buf + ret, | |
946 | con->rx_leftover); | |
947 | } | |
fdda387f PC |
948 | } |
949 | ||
b97f8525 | 950 | dlm_midcomms_receive_done(con->nodeid); |
f1f1c1cc | 951 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 952 | return 0; |
fdda387f | 953 | |
ac33d071 | 954 | out_resched: |
1d6e8131 PC |
955 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
956 | queue_work(recv_workqueue, &con->rwork); | |
f1f1c1cc | 957 | mutex_unlock(&con->sock_mutex); |
bd44e2b0 | 958 | return -EAGAIN; |
fdda387f | 959 | |
ac33d071 | 960 | out_close: |
ba868d9d | 961 | if (ret == 0) { |
ba868d9d AA |
962 | log_print("connection %p got EOF from %d", |
963 | con, con->nodeid); | |
8aa31cbf | 964 | |
a66c008c AA |
965 | if (dlm_proto_ops->eof_condition && |
966 | dlm_proto_ops->eof_condition(con)) { | |
8aa31cbf AA |
967 | set_bit(CF_EOF, &con->flags); |
968 | mutex_unlock(&con->sock_mutex); | |
969 | } else { | |
970 | mutex_unlock(&con->sock_mutex); | |
971 | close_connection(con, false, true, false); | |
972 | ||
973 | /* handling for tcp shutdown */ | |
974 | clear_bit(CF_SHUTDOWN, &con->flags); | |
975 | wake_up(&con->shutdown_wait); | |
976 | } | |
977 | ||
ba868d9d AA |
978 | /* signal to breaking receive worker */ |
979 | ret = -1; | |
8aa31cbf AA |
980 | } else { |
981 | mutex_unlock(&con->sock_mutex); | |
fdda387f | 982 | } |
fdda387f PC |
983 | return ret; |
984 | } | |
985 | ||
986 | /* Listening socket is busy, accept a connection */ | |
d11ccd45 | 987 | static int accept_from_sock(struct listen_connection *con) |
fdda387f PC |
988 | { |
989 | int result; | |
990 | struct sockaddr_storage peeraddr; | |
991 | struct socket *newsock; | |
b38bc9c2 | 992 | int len, idx; |
fdda387f PC |
993 | int nodeid; |
994 | struct connection *newcon; | |
bd44e2b0 | 995 | struct connection *addcon; |
3f78cd7d | 996 | unsigned int mark; |
fdda387f | 997 | |
d11ccd45 | 998 | if (!con->sock) |
3421fb15 | 999 | return -ENOTCONN; |
fdda387f | 1000 | |
3421fb15 | 1001 | result = kernel_accept(con->sock, &newsock, O_NONBLOCK); |
fdda387f PC |
1002 | if (result < 0) |
1003 | goto accept_err; | |
1004 | ||
1005 | /* Get the connected socket's peer */ | |
1006 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
9b2c45d4 DV |
1007 | len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); |
1008 | if (len < 0) { | |
fdda387f PC |
1009 | result = -ECONNABORTED; |
1010 | goto accept_err; | |
1011 | } | |
1012 | ||
1013 | /* Get the new node's NODEID */ | |
1014 | make_sockaddr(&peeraddr, 0, &len); | |
e125fbeb | 1015 | if (addr_to_nodeid(&peeraddr, &nodeid, &mark)) { |
bcaadf5c | 1016 | unsigned char *b=(unsigned char *)&peeraddr; |
617e82e1 | 1017 | log_print("connect from non cluster node"); |
bcaadf5c MY |
1018 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
1019 | b, sizeof(struct sockaddr_storage)); | |
fdda387f | 1020 | sock_release(newsock); |
fdda387f PC |
1021 | return -1; |
1022 | } | |
1023 | ||
1024 | log_print("got connection from %d", nodeid); | |
1025 | ||
1026 | /* Check to see if we already have a connection to this node. This | |
1027 | * could happen if the two nodes initiate a connection at roughly | |
1028 | * the same time and the connections cross on the wire. | |
fdda387f PC |
1029 | * In this case we store the incoming one in "othercon" |
1030 | */ | |
b38bc9c2 | 1031 | idx = srcu_read_lock(&connections_srcu); |
748285cc | 1032 | newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f | 1033 | if (!newcon) { |
b38bc9c2 | 1034 | srcu_read_unlock(&connections_srcu, idx); |
fdda387f PC |
1035 | result = -ENOMEM; |
1036 | goto accept_err; | |
1037 | } | |
d11ccd45 | 1038 | |
e125fbeb AA |
1039 | sock_set_mark(newsock->sk, mark); |
1040 | ||
d11ccd45 | 1041 | mutex_lock(&newcon->sock_mutex); |
fdda387f | 1042 | if (newcon->sock) { |
ac33d071 | 1043 | struct connection *othercon = newcon->othercon; |
fdda387f PC |
1044 | |
1045 | if (!othercon) { | |
a47666eb | 1046 | othercon = kzalloc(sizeof(*othercon), GFP_NOFS); |
fdda387f | 1047 | if (!othercon) { |
617e82e1 | 1048 | log_print("failed to allocate incoming socket"); |
f1f1c1cc | 1049 | mutex_unlock(&newcon->sock_mutex); |
b38bc9c2 | 1050 | srcu_read_unlock(&connections_srcu, idx); |
fdda387f PC |
1051 | result = -ENOMEM; |
1052 | goto accept_err; | |
1053 | } | |
4798cbbf | 1054 | |
6cde210a AA |
1055 | result = dlm_con_init(othercon, nodeid); |
1056 | if (result < 0) { | |
4798cbbf | 1057 | kfree(othercon); |
2fd8db2d | 1058 | mutex_unlock(&newcon->sock_mutex); |
b38bc9c2 | 1059 | srcu_read_unlock(&connections_srcu, idx); |
4798cbbf AA |
1060 | goto accept_err; |
1061 | } | |
1062 | ||
e9a470ac | 1063 | lockdep_set_subclass(&othercon->sock_mutex, 1); |
7443bc96 | 1064 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
6cde210a | 1065 | newcon->othercon = othercon; |
ba868d9d | 1066 | othercon->sendcon = newcon; |
ba3ab3ca AA |
1067 | } else { |
1068 | /* close other sock con if we have something new */ | |
1069 | close_connection(othercon, false, true, false); | |
61d96be0 | 1070 | } |
ba3ab3ca | 1071 | |
e9a470ac | 1072 | mutex_lock(&othercon->sock_mutex); |
ba3ab3ca AA |
1073 | add_sock(newsock, othercon); |
1074 | addcon = othercon; | |
1075 | mutex_unlock(&othercon->sock_mutex); | |
fdda387f PC |
1076 | } |
1077 | else { | |
3735b4b9 BP |
1078 | /* accept copies the sk after we've saved the callbacks, so we |
1079 | don't want to save them a second time or comm errors will | |
1080 | result in calling sk_error_report recursively. */ | |
988419a9 | 1081 | add_sock(newsock, newcon); |
bd44e2b0 | 1082 | addcon = newcon; |
fdda387f PC |
1083 | } |
1084 | ||
b30a624f | 1085 | set_bit(CF_CONNECTED, &addcon->flags); |
f1f1c1cc | 1086 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
1087 | |
1088 | /* | |
1089 | * Add it to the active queue in case we got data | |
25985edc | 1090 | * between processing the accept adding the socket |
fdda387f PC |
1091 | * to the read_sockets list |
1092 | */ | |
bd44e2b0 PC |
1093 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
1094 | queue_work(recv_workqueue, &addcon->rwork); | |
fdda387f | 1095 | |
b38bc9c2 AA |
1096 | srcu_read_unlock(&connections_srcu, idx); |
1097 | ||
fdda387f PC |
1098 | return 0; |
1099 | ||
ac33d071 | 1100 | accept_err: |
3421fb15 | 1101 | if (newsock) |
1102 | sock_release(newsock); | |
fdda387f PC |
1103 | |
1104 | if (result != -EAGAIN) | |
617e82e1 | 1105 | log_print("error accepting connection from node: %d", result); |
fdda387f PC |
1106 | return result; |
1107 | } | |
1108 | ||
5d689871 MC |
1109 | /* |
1110 | * writequeue_entry_complete - try to delete and free write queue entry | |
1111 | * @e: write queue entry to try to delete | |
1112 | * @completed: bytes completed | |
1113 | * | |
1114 | * writequeue_lock must be held. | |
1115 | */ | |
1116 | static void writequeue_entry_complete(struct writequeue_entry *e, int completed) | |
1117 | { | |
1118 | e->offset += completed; | |
1119 | e->len -= completed; | |
706474fb AA |
1120 | /* signal that page was half way transmitted */ |
1121 | e->dirty = true; | |
5d689871 | 1122 | |
8f2dc78d | 1123 | if (e->len == 0 && e->users == 0) |
5d689871 | 1124 | free_entry(e); |
5d689871 MC |
1125 | } |
1126 | ||
ee44b4bc MRL |
1127 | /* |
1128 | * sctp_bind_addrs - bind a SCTP socket to all our addresses | |
1129 | */ | |
13004e8a | 1130 | static int sctp_bind_addrs(struct socket *sock, uint16_t port) |
ee44b4bc MRL |
1131 | { |
1132 | struct sockaddr_storage localaddr; | |
c0425a42 | 1133 | struct sockaddr *addr = (struct sockaddr *)&localaddr; |
ee44b4bc MRL |
1134 | int i, addr_len, result = 0; |
1135 | ||
1136 | for (i = 0; i < dlm_local_count; i++) { | |
1137 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); | |
1138 | make_sockaddr(&localaddr, port, &addr_len); | |
1139 | ||
1140 | if (!i) | |
13004e8a | 1141 | result = kernel_bind(sock, addr, addr_len); |
ee44b4bc | 1142 | else |
13004e8a | 1143 | result = sock_bind_add(sock->sk, addr, addr_len); |
ee44b4bc MRL |
1144 | |
1145 | if (result < 0) { | |
1146 | log_print("Can't bind to %d addr number %d, %d.\n", | |
1147 | port, i + 1, result); | |
1148 | break; | |
1149 | } | |
1150 | } | |
1151 | return result; | |
1152 | } | |
1153 | ||
6ed7257b PC |
1154 | /* Get local addresses */ |
1155 | static void init_local(void) | |
1156 | { | |
1157 | struct sockaddr_storage sas, *addr; | |
1158 | int i; | |
1159 | ||
30d3a237 | 1160 | dlm_local_count = 0; |
1b189b88 | 1161 | for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { |
6ed7257b PC |
1162 | if (dlm_our_addr(&sas, i)) |
1163 | break; | |
1164 | ||
5c93f56f | 1165 | addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); |
6ed7257b PC |
1166 | if (!addr) |
1167 | break; | |
6ed7257b PC |
1168 | dlm_local_addr[dlm_local_count++] = addr; |
1169 | } | |
1170 | } | |
1171 | ||
043697f0 AA |
1172 | static void deinit_local(void) |
1173 | { | |
1174 | int i; | |
1175 | ||
1176 | for (i = 0; i < dlm_local_count; i++) | |
1177 | kfree(dlm_local_addr[i]); | |
1178 | } | |
1179 | ||
fdda387f PC |
1180 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, |
1181 | gfp_t allocation) | |
1182 | { | |
1183 | struct writequeue_entry *entry; | |
1184 | ||
f0747ebf | 1185 | entry = kzalloc(sizeof(*entry), allocation); |
fdda387f PC |
1186 | if (!entry) |
1187 | return NULL; | |
1188 | ||
e1a7cbce | 1189 | entry->page = alloc_page(allocation | __GFP_ZERO); |
fdda387f PC |
1190 | if (!entry->page) { |
1191 | kfree(entry); | |
1192 | return NULL; | |
1193 | } | |
1194 | ||
fdda387f | 1195 | entry->con = con; |
f0747ebf | 1196 | entry->users = 1; |
8f2dc78d AA |
1197 | kref_init(&entry->ref); |
1198 | INIT_LIST_HEAD(&entry->msgs); | |
fdda387f PC |
1199 | |
1200 | return entry; | |
1201 | } | |
1202 | ||
f0747ebf | 1203 | static struct writequeue_entry *new_wq_entry(struct connection *con, int len, |
8f2dc78d AA |
1204 | gfp_t allocation, char **ppc, |
1205 | void (*cb)(struct dlm_mhandle *mh), | |
1206 | struct dlm_mhandle *mh) | |
f0747ebf AA |
1207 | { |
1208 | struct writequeue_entry *e; | |
1209 | ||
1210 | spin_lock(&con->writequeue_lock); | |
1211 | if (!list_empty(&con->writequeue)) { | |
1212 | e = list_last_entry(&con->writequeue, struct writequeue_entry, list); | |
1213 | if (DLM_WQ_REMAIN_BYTES(e) >= len) { | |
8f2dc78d AA |
1214 | kref_get(&e->ref); |
1215 | ||
f0747ebf | 1216 | *ppc = page_address(e->page) + e->end; |
8f2dc78d AA |
1217 | if (cb) |
1218 | cb(mh); | |
1219 | ||
f0747ebf AA |
1220 | e->end += len; |
1221 | e->users++; | |
1222 | spin_unlock(&con->writequeue_lock); | |
1223 | ||
1224 | return e; | |
1225 | } | |
1226 | } | |
1227 | spin_unlock(&con->writequeue_lock); | |
1228 | ||
1229 | e = new_writequeue_entry(con, allocation); | |
1230 | if (!e) | |
1231 | return NULL; | |
1232 | ||
8f2dc78d | 1233 | kref_get(&e->ref); |
f0747ebf AA |
1234 | *ppc = page_address(e->page); |
1235 | e->end += len; | |
8aa31cbf | 1236 | atomic_inc(&con->writequeue_cnt); |
f0747ebf AA |
1237 | |
1238 | spin_lock(&con->writequeue_lock); | |
8f2dc78d AA |
1239 | if (cb) |
1240 | cb(mh); | |
1241 | ||
f0747ebf AA |
1242 | list_add_tail(&e->list, &con->writequeue); |
1243 | spin_unlock(&con->writequeue_lock); | |
1244 | ||
1245 | return e; | |
1246 | }; | |
1247 | ||
2874d1a6 AA |
1248 | static struct dlm_msg *dlm_lowcomms_new_msg_con(struct connection *con, int len, |
1249 | gfp_t allocation, char **ppc, | |
1250 | void (*cb)(struct dlm_mhandle *mh), | |
1251 | struct dlm_mhandle *mh) | |
1252 | { | |
1253 | struct writequeue_entry *e; | |
1254 | struct dlm_msg *msg; | |
c51b0221 | 1255 | bool sleepable; |
2874d1a6 AA |
1256 | |
1257 | msg = kzalloc(sizeof(*msg), allocation); | |
1258 | if (!msg) | |
1259 | return NULL; | |
1260 | ||
c51b0221 AA |
1261 | /* this mutex is being used as a wait to avoid multiple "fast" |
1262 | * new writequeue page list entry allocs in new_wq_entry in | |
1263 | * normal operation which is sleepable context. Without it | |
1264 | * we could end in multiple writequeue entries with one | |
1265 | * dlm message because multiple callers were waiting at | |
1266 | * the writequeue_lock in new_wq_entry(). | |
1267 | */ | |
1268 | sleepable = gfpflags_normal_context(allocation); | |
1269 | if (sleepable) | |
1270 | mutex_lock(&con->wq_alloc); | |
1271 | ||
2874d1a6 AA |
1272 | kref_init(&msg->ref); |
1273 | ||
1274 | e = new_wq_entry(con, len, allocation, ppc, cb, mh); | |
1275 | if (!e) { | |
c51b0221 AA |
1276 | if (sleepable) |
1277 | mutex_unlock(&con->wq_alloc); | |
1278 | ||
2874d1a6 AA |
1279 | kfree(msg); |
1280 | return NULL; | |
1281 | } | |
1282 | ||
c51b0221 AA |
1283 | if (sleepable) |
1284 | mutex_unlock(&con->wq_alloc); | |
1285 | ||
2874d1a6 AA |
1286 | msg->ppc = *ppc; |
1287 | msg->len = len; | |
1288 | msg->entry = e; | |
1289 | ||
1290 | return msg; | |
1291 | } | |
1292 | ||
8f2dc78d AA |
1293 | struct dlm_msg *dlm_lowcomms_new_msg(int nodeid, int len, gfp_t allocation, |
1294 | char **ppc, void (*cb)(struct dlm_mhandle *mh), | |
1295 | struct dlm_mhandle *mh) | |
fdda387f PC |
1296 | { |
1297 | struct connection *con; | |
8f2dc78d | 1298 | struct dlm_msg *msg; |
b38bc9c2 | 1299 | int idx; |
fdda387f | 1300 | |
d10a0b88 | 1301 | if (len > DLM_MAX_SOCKET_BUFSIZE || |
c45674fb | 1302 | len < sizeof(struct dlm_header)) { |
d10a0b88 | 1303 | BUILD_BUG_ON(PAGE_SIZE < DLM_MAX_SOCKET_BUFSIZE); |
692f51c8 | 1304 | log_print("failed to allocate a buffer of size %d", len); |
c45674fb | 1305 | WARN_ON(1); |
692f51c8 AA |
1306 | return NULL; |
1307 | } | |
1308 | ||
b38bc9c2 | 1309 | idx = srcu_read_lock(&connections_srcu); |
fdda387f | 1310 | con = nodeid2con(nodeid, allocation); |
b38bc9c2 AA |
1311 | if (!con) { |
1312 | srcu_read_unlock(&connections_srcu, idx); | |
fdda387f | 1313 | return NULL; |
b38bc9c2 AA |
1314 | } |
1315 | ||
2874d1a6 | 1316 | msg = dlm_lowcomms_new_msg_con(con, len, allocation, ppc, cb, mh); |
8f2dc78d AA |
1317 | if (!msg) { |
1318 | srcu_read_unlock(&connections_srcu, idx); | |
1319 | return NULL; | |
1320 | } | |
1321 | ||
b38bc9c2 | 1322 | /* we assume if successful commit must called */ |
8f2dc78d | 1323 | msg->idx = idx; |
8f2dc78d | 1324 | return msg; |
fdda387f PC |
1325 | } |
1326 | ||
2874d1a6 | 1327 | static void _dlm_lowcomms_commit_msg(struct dlm_msg *msg) |
fdda387f | 1328 | { |
8f2dc78d | 1329 | struct writequeue_entry *e = msg->entry; |
fdda387f PC |
1330 | struct connection *con = e->con; |
1331 | int users; | |
1332 | ||
4edde74e | 1333 | spin_lock(&con->writequeue_lock); |
8f2dc78d AA |
1334 | kref_get(&msg->ref); |
1335 | list_add(&msg->list, &e->msgs); | |
1336 | ||
fdda387f PC |
1337 | users = --e->users; |
1338 | if (users) | |
1339 | goto out; | |
f0747ebf AA |
1340 | |
1341 | e->len = DLM_WQ_LENGTH_BYTES(e); | |
fdda387f PC |
1342 | spin_unlock(&con->writequeue_lock); |
1343 | ||
01da24d3 | 1344 | queue_work(send_workqueue, &con->swork); |
fdda387f PC |
1345 | return; |
1346 | ||
ac33d071 | 1347 | out: |
fdda387f PC |
1348 | spin_unlock(&con->writequeue_lock); |
1349 | return; | |
1350 | } | |
1351 | ||
2874d1a6 AA |
1352 | void dlm_lowcomms_commit_msg(struct dlm_msg *msg) |
1353 | { | |
1354 | _dlm_lowcomms_commit_msg(msg); | |
1355 | srcu_read_unlock(&connections_srcu, msg->idx); | |
1356 | } | |
1357 | ||
8f2dc78d AA |
1358 | void dlm_lowcomms_put_msg(struct dlm_msg *msg) |
1359 | { | |
1360 | kref_put(&msg->ref, dlm_msg_release); | |
1361 | } | |
1362 | ||
2874d1a6 AA |
1363 | /* does not held connections_srcu, usage workqueue only */ |
1364 | int dlm_lowcomms_resend_msg(struct dlm_msg *msg) | |
1365 | { | |
1366 | struct dlm_msg *msg_resend; | |
1367 | char *ppc; | |
1368 | ||
1369 | if (msg->retransmit) | |
1370 | return 1; | |
1371 | ||
1372 | msg_resend = dlm_lowcomms_new_msg_con(msg->entry->con, msg->len, | |
1373 | GFP_ATOMIC, &ppc, NULL, NULL); | |
1374 | if (!msg_resend) | |
1375 | return -ENOMEM; | |
1376 | ||
1377 | msg->retransmit = true; | |
1378 | kref_get(&msg->ref); | |
1379 | msg_resend->orig_msg = msg; | |
1380 | ||
1381 | memcpy(ppc, msg->ppc, msg->len); | |
1382 | _dlm_lowcomms_commit_msg(msg_resend); | |
1383 | dlm_lowcomms_put_msg(msg_resend); | |
1384 | ||
1385 | return 0; | |
1386 | } | |
1387 | ||
fdda387f | 1388 | /* Send a message */ |
ac33d071 | 1389 | static void send_to_sock(struct connection *con) |
fdda387f | 1390 | { |
fdda387f PC |
1391 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1392 | struct writequeue_entry *e; | |
66d5955a | 1393 | int len, offset, ret; |
f92c8dd7 | 1394 | int count = 0; |
fdda387f | 1395 | |
f1f1c1cc | 1396 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1397 | if (con->sock == NULL) |
1398 | goto out_connect; | |
1399 | ||
fdda387f PC |
1400 | spin_lock(&con->writequeue_lock); |
1401 | for (;;) { | |
66d5955a AA |
1402 | e = con_next_wq(con); |
1403 | if (!e) | |
fdda387f PC |
1404 | break; |
1405 | ||
f0747ebf | 1406 | e = list_first_entry(&con->writequeue, struct writequeue_entry, list); |
fdda387f PC |
1407 | len = e->len; |
1408 | offset = e->offset; | |
1409 | BUG_ON(len == 0 && e->users == 0); | |
1410 | spin_unlock(&con->writequeue_lock); | |
1411 | ||
66d5955a AA |
1412 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
1413 | msg_flags); | |
1414 | if (ret == -EAGAIN || ret == 0) { | |
1415 | if (ret == -EAGAIN && | |
1416 | test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && | |
1417 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { | |
1418 | /* Notify TCP that we're limited by the | |
1419 | * application window size. | |
1420 | */ | |
1421 | set_bit(SOCK_NOSPACE, &con->sock->flags); | |
1422 | con->sock->sk->sk_write_pending++; | |
1423 | } | |
1424 | cond_resched(); | |
1425 | goto out; | |
1426 | } else if (ret < 0) | |
1427 | goto out; | |
f92c8dd7 BP |
1428 | |
1429 | /* Don't starve people filling buffers */ | |
1430 | if (++count >= MAX_SEND_MSG_COUNT) { | |
ac33d071 | 1431 | cond_resched(); |
f92c8dd7 BP |
1432 | count = 0; |
1433 | } | |
fdda387f PC |
1434 | |
1435 | spin_lock(&con->writequeue_lock); | |
5d689871 | 1436 | writequeue_entry_complete(e, ret); |
fdda387f PC |
1437 | } |
1438 | spin_unlock(&con->writequeue_lock); | |
8aa31cbf AA |
1439 | |
1440 | /* close if we got EOF */ | |
1441 | if (test_and_clear_bit(CF_EOF, &con->flags)) { | |
1442 | mutex_unlock(&con->sock_mutex); | |
1443 | close_connection(con, false, false, true); | |
1444 | ||
1445 | /* handling for tcp shutdown */ | |
1446 | clear_bit(CF_SHUTDOWN, &con->flags); | |
1447 | wake_up(&con->shutdown_wait); | |
1448 | } else { | |
1449 | mutex_unlock(&con->sock_mutex); | |
1450 | } | |
1451 | ||
1452 | return; | |
1453 | ||
ac33d071 | 1454 | out: |
f1f1c1cc | 1455 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1456 | return; |
fdda387f | 1457 | |
ac33d071 | 1458 | out_connect: |
f1f1c1cc | 1459 | mutex_unlock(&con->sock_mutex); |
01da24d3 BP |
1460 | queue_work(send_workqueue, &con->swork); |
1461 | cond_resched(); | |
fdda387f PC |
1462 | } |
1463 | ||
1464 | static void clean_one_writequeue(struct connection *con) | |
1465 | { | |
5e9ccc37 | 1466 | struct writequeue_entry *e, *safe; |
fdda387f PC |
1467 | |
1468 | spin_lock(&con->writequeue_lock); | |
5e9ccc37 | 1469 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f PC |
1470 | free_entry(e); |
1471 | } | |
1472 | spin_unlock(&con->writequeue_lock); | |
1473 | } | |
1474 | ||
1475 | /* Called from recovery when it knows that a node has | |
1476 | left the cluster */ | |
1477 | int dlm_lowcomms_close(int nodeid) | |
1478 | { | |
1479 | struct connection *con; | |
36b71a8b | 1480 | struct dlm_node_addr *na; |
b38bc9c2 | 1481 | int idx; |
fdda387f | 1482 | |
fdda387f | 1483 | log_print("closing connection to node %d", nodeid); |
b38bc9c2 | 1484 | idx = srcu_read_lock(&connections_srcu); |
fdda387f PC |
1485 | con = nodeid2con(nodeid, 0); |
1486 | if (con) { | |
063c4c99 | 1487 | set_bit(CF_CLOSE, &con->flags); |
0d737a8c | 1488 | close_connection(con, true, true, true); |
fdda387f | 1489 | clean_one_writequeue(con); |
53a5edaa AA |
1490 | if (con->othercon) |
1491 | clean_one_writequeue(con->othercon); | |
fdda387f | 1492 | } |
b38bc9c2 | 1493 | srcu_read_unlock(&connections_srcu, idx); |
36b71a8b DT |
1494 | |
1495 | spin_lock(&dlm_node_addrs_spin); | |
1496 | na = find_node_addr(nodeid); | |
1497 | if (na) { | |
1498 | list_del(&na->list); | |
1499 | while (na->addr_count--) | |
1500 | kfree(na->addr[na->addr_count]); | |
1501 | kfree(na); | |
1502 | } | |
1503 | spin_unlock(&dlm_node_addrs_spin); | |
1504 | ||
fdda387f | 1505 | return 0; |
fdda387f PC |
1506 | } |
1507 | ||
6ed7257b | 1508 | /* Receive workqueue function */ |
1d6e8131 | 1509 | static void process_recv_sockets(struct work_struct *work) |
fdda387f | 1510 | { |
1d6e8131 | 1511 | struct connection *con = container_of(work, struct connection, rwork); |
fdda387f | 1512 | |
1d6e8131 | 1513 | clear_bit(CF_READ_PENDING, &con->flags); |
62699b3f | 1514 | receive_from_sock(con); |
fdda387f PC |
1515 | } |
1516 | ||
d11ccd45 AA |
1517 | static void process_listen_recv_socket(struct work_struct *work) |
1518 | { | |
1519 | accept_from_sock(&listen_con); | |
1520 | } | |
1521 | ||
8728a455 AA |
1522 | static void dlm_connect(struct connection *con) |
1523 | { | |
1524 | struct sockaddr_storage addr; | |
1525 | int result, addr_len; | |
1526 | struct socket *sock; | |
1527 | unsigned int mark; | |
1528 | ||
1529 | /* Some odd races can cause double-connects, ignore them */ | |
1530 | if (con->retries++ > MAX_CONNECT_RETRIES) | |
1531 | return; | |
1532 | ||
1533 | if (con->sock) { | |
1534 | log_print("node %d already connected.", con->nodeid); | |
1535 | return; | |
1536 | } | |
1537 | ||
1538 | memset(&addr, 0, sizeof(addr)); | |
1539 | result = nodeid_to_addr(con->nodeid, &addr, NULL, | |
1540 | dlm_proto_ops->try_new_addr, &mark); | |
1541 | if (result < 0) { | |
1542 | log_print("no address for nodeid %d", con->nodeid); | |
1543 | return; | |
1544 | } | |
1545 | ||
1546 | /* Create a socket to communicate with */ | |
1547 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, | |
1548 | SOCK_STREAM, dlm_proto_ops->proto, &sock); | |
1549 | if (result < 0) | |
1550 | goto socket_err; | |
1551 | ||
1552 | sock_set_mark(sock->sk, mark); | |
1553 | dlm_proto_ops->sockopts(sock); | |
1554 | ||
1555 | add_sock(sock, con); | |
1556 | ||
1557 | result = dlm_proto_ops->bind(sock); | |
1558 | if (result < 0) | |
1559 | goto add_sock_err; | |
1560 | ||
1561 | log_print_ratelimited("connecting to %d", con->nodeid); | |
1562 | make_sockaddr(&addr, dlm_config.ci_tcp_port, &addr_len); | |
1563 | result = dlm_proto_ops->connect(con, sock, (struct sockaddr *)&addr, | |
1564 | addr_len); | |
1565 | if (result < 0) | |
1566 | goto add_sock_err; | |
1567 | ||
1568 | return; | |
1569 | ||
1570 | add_sock_err: | |
1571 | dlm_close_sock(&con->sock); | |
1572 | ||
1573 | socket_err: | |
1574 | /* | |
1575 | * Some errors are fatal and this list might need adjusting. For other | |
1576 | * errors we try again until the max number of retries is reached. | |
1577 | */ | |
1578 | if (result != -EHOSTUNREACH && | |
1579 | result != -ENETUNREACH && | |
1580 | result != -ENETDOWN && | |
1581 | result != -EINVAL && | |
1582 | result != -EPROTONOSUPPORT) { | |
1583 | log_print("connect %d try %d error %d", con->nodeid, | |
1584 | con->retries, result); | |
1585 | msleep(1000); | |
1586 | lowcomms_connect_sock(con); | |
1587 | } | |
1588 | } | |
1589 | ||
6ed7257b | 1590 | /* Send workqueue function */ |
1d6e8131 | 1591 | static void process_send_sockets(struct work_struct *work) |
fdda387f | 1592 | { |
1d6e8131 | 1593 | struct connection *con = container_of(work, struct connection, swork); |
fdda387f | 1594 | |
7443bc96 AA |
1595 | WARN_ON(test_bit(CF_IS_OTHERCON, &con->flags)); |
1596 | ||
8a4abb08 | 1597 | clear_bit(CF_WRITE_PENDING, &con->flags); |
ba868d9d | 1598 | |
489d8e55 | 1599 | if (test_and_clear_bit(CF_RECONNECT, &con->flags)) { |
ba868d9d | 1600 | close_connection(con, false, false, true); |
489d8e55 AA |
1601 | dlm_midcomms_unack_msg_resend(con->nodeid); |
1602 | } | |
ba868d9d | 1603 | |
8728a455 | 1604 | if (con->sock == NULL) { |
ba868d9d AA |
1605 | if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags)) |
1606 | msleep(1000); | |
8728a455 AA |
1607 | |
1608 | mutex_lock(&con->sock_mutex); | |
1609 | dlm_connect(con); | |
1610 | mutex_unlock(&con->sock_mutex); | |
ba868d9d | 1611 | } |
8728a455 | 1612 | |
01da24d3 | 1613 | if (!list_empty(&con->writequeue)) |
063c4c99 | 1614 | send_to_sock(con); |
fdda387f PC |
1615 | } |
1616 | ||
1d6e8131 | 1617 | static void work_stop(void) |
fdda387f | 1618 | { |
fcef0e6c | 1619 | if (recv_workqueue) { |
b355516f | 1620 | destroy_workqueue(recv_workqueue); |
fcef0e6c AA |
1621 | recv_workqueue = NULL; |
1622 | } | |
1623 | ||
1624 | if (send_workqueue) { | |
b355516f | 1625 | destroy_workqueue(send_workqueue); |
fcef0e6c AA |
1626 | send_workqueue = NULL; |
1627 | } | |
fdda387f PC |
1628 | } |
1629 | ||
1d6e8131 | 1630 | static int work_start(void) |
fdda387f | 1631 | { |
6c6a1cc6 | 1632 | recv_workqueue = alloc_ordered_workqueue("dlm_recv", WQ_MEM_RECLAIM); |
b9d41052 NK |
1633 | if (!recv_workqueue) { |
1634 | log_print("can't start dlm_recv"); | |
1635 | return -ENOMEM; | |
fdda387f | 1636 | } |
fdda387f | 1637 | |
6c6a1cc6 | 1638 | send_workqueue = alloc_ordered_workqueue("dlm_send", WQ_MEM_RECLAIM); |
b9d41052 NK |
1639 | if (!send_workqueue) { |
1640 | log_print("can't start dlm_send"); | |
1d6e8131 | 1641 | destroy_workqueue(recv_workqueue); |
fcef0e6c | 1642 | recv_workqueue = NULL; |
b9d41052 | 1643 | return -ENOMEM; |
fdda387f | 1644 | } |
fdda387f PC |
1645 | |
1646 | return 0; | |
1647 | } | |
1648 | ||
9d232469 AA |
1649 | static void shutdown_conn(struct connection *con) |
1650 | { | |
a66c008c AA |
1651 | if (dlm_proto_ops->shutdown_action) |
1652 | dlm_proto_ops->shutdown_action(con); | |
9d232469 AA |
1653 | } |
1654 | ||
1655 | void dlm_lowcomms_shutdown(void) | |
1656 | { | |
b38bc9c2 AA |
1657 | int idx; |
1658 | ||
9d232469 AA |
1659 | /* Set all the flags to prevent any |
1660 | * socket activity. | |
1661 | */ | |
1662 | dlm_allow_conn = 0; | |
1663 | ||
1664 | if (recv_workqueue) | |
1665 | flush_workqueue(recv_workqueue); | |
1666 | if (send_workqueue) | |
1667 | flush_workqueue(send_workqueue); | |
1668 | ||
1669 | dlm_close_sock(&listen_con.sock); | |
1670 | ||
b38bc9c2 | 1671 | idx = srcu_read_lock(&connections_srcu); |
9d232469 | 1672 | foreach_conn(shutdown_conn); |
b38bc9c2 | 1673 | srcu_read_unlock(&connections_srcu, idx); |
9d232469 AA |
1674 | } |
1675 | ||
f0fb83cb | 1676 | static void _stop_conn(struct connection *con, bool and_other) |
fdda387f | 1677 | { |
f0fb83cb | 1678 | mutex_lock(&con->sock_mutex); |
173a31fe | 1679 | set_bit(CF_CLOSE, &con->flags); |
f0fb83cb | 1680 | set_bit(CF_READ_PENDING, &con->flags); |
8a4abb08 | 1681 | set_bit(CF_WRITE_PENDING, &con->flags); |
93eaadeb | 1682 | if (con->sock && con->sock->sk) { |
1683 | write_lock_bh(&con->sock->sk->sk_callback_lock); | |
5e9ccc37 | 1684 | con->sock->sk->sk_user_data = NULL; |
93eaadeb | 1685 | write_unlock_bh(&con->sock->sk->sk_callback_lock); |
1686 | } | |
f0fb83cb | 1687 | if (con->othercon && and_other) |
1688 | _stop_conn(con->othercon, false); | |
1689 | mutex_unlock(&con->sock_mutex); | |
1690 | } | |
1691 | ||
1692 | static void stop_conn(struct connection *con) | |
1693 | { | |
1694 | _stop_conn(con, true); | |
5e9ccc37 | 1695 | } |
fdda387f | 1696 | |
4798cbbf AA |
1697 | static void connection_release(struct rcu_head *rcu) |
1698 | { | |
1699 | struct connection *con = container_of(rcu, struct connection, rcu); | |
1700 | ||
1701 | kfree(con->rx_buf); | |
1702 | kfree(con); | |
1703 | } | |
1704 | ||
5e9ccc37 CC |
1705 | static void free_conn(struct connection *con) |
1706 | { | |
0d737a8c | 1707 | close_connection(con, true, true, true); |
a47666eb AA |
1708 | spin_lock(&connections_lock); |
1709 | hlist_del_rcu(&con->list); | |
1710 | spin_unlock(&connections_lock); | |
948c47e9 AA |
1711 | if (con->othercon) { |
1712 | clean_one_writequeue(con->othercon); | |
5cbec208 AA |
1713 | call_srcu(&connections_srcu, &con->othercon->rcu, |
1714 | connection_release); | |
948c47e9 | 1715 | } |
0de98432 | 1716 | clean_one_writequeue(con); |
5cbec208 | 1717 | call_srcu(&connections_srcu, &con->rcu, connection_release); |
5e9ccc37 CC |
1718 | } |
1719 | ||
f0fb83cb | 1720 | static void work_flush(void) |
1721 | { | |
b38bc9c2 | 1722 | int ok; |
f0fb83cb | 1723 | int i; |
f0fb83cb | 1724 | struct connection *con; |
1725 | ||
f0fb83cb | 1726 | do { |
1727 | ok = 1; | |
1728 | foreach_conn(stop_conn); | |
b355516f DW |
1729 | if (recv_workqueue) |
1730 | flush_workqueue(recv_workqueue); | |
1731 | if (send_workqueue) | |
1732 | flush_workqueue(send_workqueue); | |
f0fb83cb | 1733 | for (i = 0; i < CONN_HASH_SIZE && ok; i++) { |
a47666eb AA |
1734 | hlist_for_each_entry_rcu(con, &connection_hash[i], |
1735 | list) { | |
f0fb83cb | 1736 | ok &= test_bit(CF_READ_PENDING, &con->flags); |
8a4abb08 | 1737 | ok &= test_bit(CF_WRITE_PENDING, &con->flags); |
1738 | if (con->othercon) { | |
f0fb83cb | 1739 | ok &= test_bit(CF_READ_PENDING, |
1740 | &con->othercon->flags); | |
8a4abb08 | 1741 | ok &= test_bit(CF_WRITE_PENDING, |
1742 | &con->othercon->flags); | |
1743 | } | |
f0fb83cb | 1744 | } |
1745 | } | |
1746 | } while (!ok); | |
1747 | } | |
1748 | ||
5e9ccc37 CC |
1749 | void dlm_lowcomms_stop(void) |
1750 | { | |
b38bc9c2 AA |
1751 | int idx; |
1752 | ||
1753 | idx = srcu_read_lock(&connections_srcu); | |
f0fb83cb | 1754 | work_flush(); |
3a8db798 | 1755 | foreach_conn(free_conn); |
b38bc9c2 | 1756 | srcu_read_unlock(&connections_srcu, idx); |
1d6e8131 | 1757 | work_stop(); |
043697f0 | 1758 | deinit_local(); |
a66c008c AA |
1759 | |
1760 | dlm_proto_ops = NULL; | |
fdda387f PC |
1761 | } |
1762 | ||
2dc6b115 AA |
1763 | static int dlm_listen_for_all(void) |
1764 | { | |
1765 | struct socket *sock; | |
1766 | int result; | |
1767 | ||
1768 | log_print("Using %s for communications", | |
1769 | dlm_proto_ops->name); | |
1770 | ||
90d21fc0 AA |
1771 | result = dlm_proto_ops->listen_validate(); |
1772 | if (result < 0) | |
1773 | return result; | |
2dc6b115 AA |
1774 | |
1775 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, | |
1776 | SOCK_STREAM, dlm_proto_ops->proto, &sock); | |
1777 | if (result < 0) { | |
1778 | log_print("Can't create comms socket, check SCTP is loaded"); | |
1779 | goto out; | |
1780 | } | |
1781 | ||
1782 | sock_set_mark(sock->sk, dlm_config.ci_mark); | |
1783 | dlm_proto_ops->listen_sockopts(sock); | |
1784 | ||
1785 | result = dlm_proto_ops->listen_bind(sock); | |
1786 | if (result < 0) | |
1787 | goto out; | |
1788 | ||
1789 | save_listen_callbacks(sock); | |
1790 | add_listen_sock(sock, &listen_con); | |
1791 | ||
1792 | INIT_WORK(&listen_con.rwork, process_listen_recv_socket); | |
1793 | result = sock->ops->listen(sock, 5); | |
1794 | if (result < 0) { | |
1795 | dlm_close_sock(&listen_con.sock); | |
1796 | goto out; | |
1797 | } | |
1798 | ||
1799 | return 0; | |
1800 | ||
1801 | out: | |
1802 | sock_release(sock); | |
1803 | return result; | |
1804 | } | |
1805 | ||
8728a455 AA |
1806 | static int dlm_tcp_bind(struct socket *sock) |
1807 | { | |
1808 | struct sockaddr_storage src_addr; | |
1809 | int result, addr_len; | |
1810 | ||
1811 | /* Bind to our cluster-known address connecting to avoid | |
1812 | * routing problems. | |
1813 | */ | |
1814 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); | |
1815 | make_sockaddr(&src_addr, 0, &addr_len); | |
1816 | ||
1817 | result = sock->ops->bind(sock, (struct sockaddr *)&src_addr, | |
1818 | addr_len); | |
1819 | if (result < 0) { | |
1820 | /* This *may* not indicate a critical error */ | |
1821 | log_print("could not bind for connect: %d", result); | |
1822 | } | |
1823 | ||
1824 | return 0; | |
1825 | } | |
1826 | ||
1827 | static int dlm_tcp_connect(struct connection *con, struct socket *sock, | |
1828 | struct sockaddr *addr, int addr_len) | |
1829 | { | |
1830 | int ret; | |
1831 | ||
1832 | ret = sock->ops->connect(sock, addr, addr_len, O_NONBLOCK); | |
1833 | switch (ret) { | |
1834 | case -EINPROGRESS: | |
1835 | fallthrough; | |
1836 | case 0: | |
1837 | return 0; | |
1838 | } | |
1839 | ||
1840 | return ret; | |
1841 | } | |
1842 | ||
2dc6b115 AA |
1843 | static int dlm_tcp_listen_validate(void) |
1844 | { | |
1845 | /* We don't support multi-homed hosts */ | |
1846 | if (dlm_local_count > 1) { | |
1847 | log_print("TCP protocol can't handle multi-homed hosts, try SCTP"); | |
1848 | return -EINVAL; | |
1849 | } | |
1850 | ||
1851 | return 0; | |
1852 | } | |
1853 | ||
1854 | static void dlm_tcp_sockopts(struct socket *sock) | |
1855 | { | |
1856 | /* Turn off Nagle's algorithm */ | |
1857 | tcp_sock_set_nodelay(sock->sk); | |
1858 | } | |
1859 | ||
1860 | static void dlm_tcp_listen_sockopts(struct socket *sock) | |
1861 | { | |
1862 | dlm_tcp_sockopts(sock); | |
1863 | sock_set_reuseaddr(sock->sk); | |
1864 | } | |
1865 | ||
1866 | static int dlm_tcp_listen_bind(struct socket *sock) | |
1867 | { | |
1868 | int addr_len; | |
1869 | ||
1870 | /* Bind to our port */ | |
1871 | make_sockaddr(dlm_local_addr[0], dlm_config.ci_tcp_port, &addr_len); | |
1872 | return sock->ops->bind(sock, (struct sockaddr *)dlm_local_addr[0], | |
1873 | addr_len); | |
1874 | } | |
1875 | ||
a66c008c | 1876 | static const struct dlm_proto_ops dlm_tcp_ops = { |
2dc6b115 AA |
1877 | .name = "TCP", |
1878 | .proto = IPPROTO_TCP, | |
8728a455 AA |
1879 | .connect = dlm_tcp_connect, |
1880 | .sockopts = dlm_tcp_sockopts, | |
1881 | .bind = dlm_tcp_bind, | |
2dc6b115 AA |
1882 | .listen_validate = dlm_tcp_listen_validate, |
1883 | .listen_sockopts = dlm_tcp_listen_sockopts, | |
1884 | .listen_bind = dlm_tcp_listen_bind, | |
a66c008c AA |
1885 | .shutdown_action = dlm_tcp_shutdown, |
1886 | .eof_condition = tcp_eof_condition, | |
1887 | }; | |
1888 | ||
8728a455 AA |
1889 | static int dlm_sctp_bind(struct socket *sock) |
1890 | { | |
1891 | return sctp_bind_addrs(sock, 0); | |
1892 | } | |
1893 | ||
1894 | static int dlm_sctp_connect(struct connection *con, struct socket *sock, | |
1895 | struct sockaddr *addr, int addr_len) | |
1896 | { | |
1897 | int ret; | |
1898 | ||
1899 | /* | |
1900 | * Make sock->ops->connect() function return in specified time, | |
1901 | * since O_NONBLOCK argument in connect() function does not work here, | |
1902 | * then, we should restore the default value of this attribute. | |
1903 | */ | |
1904 | sock_set_sndtimeo(sock->sk, 5); | |
1905 | ret = sock->ops->connect(sock, addr, addr_len, 0); | |
1906 | sock_set_sndtimeo(sock->sk, 0); | |
1907 | if (ret < 0) | |
1908 | return ret; | |
1909 | ||
1910 | if (!test_and_set_bit(CF_CONNECTED, &con->flags)) | |
1911 | log_print("successful connected to node %d", con->nodeid); | |
1912 | ||
1913 | return 0; | |
1914 | } | |
1915 | ||
90d21fc0 AA |
1916 | static int dlm_sctp_listen_validate(void) |
1917 | { | |
1918 | if (!IS_ENABLED(CONFIG_IP_SCTP)) { | |
1919 | log_print("SCTP is not enabled by this kernel"); | |
1920 | return -EOPNOTSUPP; | |
1921 | } | |
1922 | ||
1923 | request_module("sctp"); | |
1924 | return 0; | |
1925 | } | |
1926 | ||
2dc6b115 AA |
1927 | static int dlm_sctp_bind_listen(struct socket *sock) |
1928 | { | |
1929 | return sctp_bind_addrs(sock, dlm_config.ci_tcp_port); | |
1930 | } | |
1931 | ||
1932 | static void dlm_sctp_sockopts(struct socket *sock) | |
1933 | { | |
1934 | /* Turn off Nagle's algorithm */ | |
1935 | sctp_sock_set_nodelay(sock->sk); | |
1936 | sock_set_rcvbuf(sock->sk, NEEDED_RMEM); | |
1937 | } | |
1938 | ||
a66c008c | 1939 | static const struct dlm_proto_ops dlm_sctp_ops = { |
2dc6b115 AA |
1940 | .name = "SCTP", |
1941 | .proto = IPPROTO_SCTP, | |
8728a455 AA |
1942 | .try_new_addr = true, |
1943 | .connect = dlm_sctp_connect, | |
1944 | .sockopts = dlm_sctp_sockopts, | |
1945 | .bind = dlm_sctp_bind, | |
90d21fc0 | 1946 | .listen_validate = dlm_sctp_listen_validate, |
2dc6b115 AA |
1947 | .listen_sockopts = dlm_sctp_sockopts, |
1948 | .listen_bind = dlm_sctp_bind_listen, | |
a66c008c AA |
1949 | }; |
1950 | ||
fdda387f PC |
1951 | int dlm_lowcomms_start(void) |
1952 | { | |
6ed7257b | 1953 | int error = -EINVAL; |
5e9ccc37 CC |
1954 | int i; |
1955 | ||
1956 | for (i = 0; i < CONN_HASH_SIZE; i++) | |
1957 | INIT_HLIST_HEAD(&connection_hash[i]); | |
fdda387f | 1958 | |
6ed7257b PC |
1959 | init_local(); |
1960 | if (!dlm_local_count) { | |
617e82e1 | 1961 | error = -ENOTCONN; |
fdda387f | 1962 | log_print("no local IP address has been set"); |
513ef596 | 1963 | goto fail; |
fdda387f PC |
1964 | } |
1965 | ||
d11ccd45 AA |
1966 | INIT_WORK(&listen_con.rwork, process_listen_recv_socket); |
1967 | ||
513ef596 DT |
1968 | error = work_start(); |
1969 | if (error) | |
fcef0e6c | 1970 | goto fail_local; |
513ef596 DT |
1971 | |
1972 | dlm_allow_conn = 1; | |
fdda387f | 1973 | |
fdda387f | 1974 | /* Start listening */ |
ac7d5d03 AA |
1975 | switch (dlm_config.ci_protocol) { |
1976 | case DLM_PROTO_TCP: | |
a66c008c | 1977 | dlm_proto_ops = &dlm_tcp_ops; |
ac7d5d03 AA |
1978 | break; |
1979 | case DLM_PROTO_SCTP: | |
a66c008c | 1980 | dlm_proto_ops = &dlm_sctp_ops; |
ac7d5d03 AA |
1981 | break; |
1982 | default: | |
1983 | log_print("Invalid protocol identifier %d set", | |
1984 | dlm_config.ci_protocol); | |
1985 | error = -EINVAL; | |
2dc6b115 | 1986 | goto fail_proto_ops; |
ac7d5d03 | 1987 | } |
2dc6b115 AA |
1988 | |
1989 | error = dlm_listen_for_all(); | |
fdda387f | 1990 | if (error) |
2dc6b115 | 1991 | goto fail_listen; |
fdda387f | 1992 | |
fdda387f PC |
1993 | return 0; |
1994 | ||
2dc6b115 AA |
1995 | fail_listen: |
1996 | dlm_proto_ops = NULL; | |
1997 | fail_proto_ops: | |
513ef596 | 1998 | dlm_allow_conn = 0; |
d11ccd45 | 1999 | dlm_close_sock(&listen_con.sock); |
fcef0e6c AA |
2000 | work_stop(); |
2001 | fail_local: | |
2002 | deinit_local(); | |
513ef596 | 2003 | fail: |
fdda387f PC |
2004 | return error; |
2005 | } | |
36b71a8b DT |
2006 | |
2007 | void dlm_lowcomms_exit(void) | |
2008 | { | |
2009 | struct dlm_node_addr *na, *safe; | |
2010 | ||
2011 | spin_lock(&dlm_node_addrs_spin); | |
2012 | list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { | |
2013 | list_del(&na->list); | |
2014 | while (na->addr_count--) | |
2015 | kfree(na->addr[na->addr_count]); | |
2016 | kfree(na); | |
2017 | } | |
2018 | spin_unlock(&dlm_node_addrs_spin); | |
2019 | } |