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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 | 61 | #define NEEDED_RMEM (4*1024*1024) |
5e9ccc37 | 62 | #define CONN_HASH_SIZE 32 |
6ed7257b | 63 | |
f92c8dd7 BP |
64 | /* Number of messages to send before rescheduling */ |
65 | #define MAX_SEND_MSG_COUNT 25 | |
66 | ||
fdda387f | 67 | struct cbuf { |
ac33d071 PC |
68 | unsigned int base; |
69 | unsigned int len; | |
70 | unsigned int mask; | |
fdda387f PC |
71 | }; |
72 | ||
ac33d071 PC |
73 | static void cbuf_add(struct cbuf *cb, int n) |
74 | { | |
75 | cb->len += n; | |
76 | } | |
fdda387f | 77 | |
ac33d071 PC |
78 | static int cbuf_data(struct cbuf *cb) |
79 | { | |
80 | return ((cb->base + cb->len) & cb->mask); | |
81 | } | |
82 | ||
83 | static void cbuf_init(struct cbuf *cb, int size) | |
84 | { | |
85 | cb->base = cb->len = 0; | |
86 | cb->mask = size-1; | |
87 | } | |
88 | ||
89 | static void cbuf_eat(struct cbuf *cb, int n) | |
90 | { | |
91 | cb->len -= n; | |
92 | cb->base += n; | |
93 | cb->base &= cb->mask; | |
94 | } | |
95 | ||
96 | static bool cbuf_empty(struct cbuf *cb) | |
97 | { | |
98 | return cb->len == 0; | |
99 | } | |
fdda387f | 100 | |
fdda387f PC |
101 | struct connection { |
102 | struct socket *sock; /* NULL if not connected */ | |
103 | uint32_t nodeid; /* So we know who we are in the list */ | |
f1f1c1cc | 104 | struct mutex sock_mutex; |
6ed7257b | 105 | unsigned long flags; |
fdda387f | 106 | #define CF_READ_PENDING 1 |
8a4abb08 | 107 | #define CF_WRITE_PENDING 2 |
6ed7257b PC |
108 | #define CF_INIT_PENDING 4 |
109 | #define CF_IS_OTHERCON 5 | |
063c4c99 | 110 | #define CF_CLOSE 6 |
b36930dd | 111 | #define CF_APP_LIMITED 7 |
b2a66629 | 112 | #define CF_CLOSING 8 |
ac33d071 | 113 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
fdda387f PC |
114 | spinlock_t writequeue_lock; |
115 | int (*rx_action) (struct connection *); /* What to do when active */ | |
6ed7257b | 116 | void (*connect_action) (struct connection *); /* What to do to connect */ |
fdda387f PC |
117 | struct page *rx_page; |
118 | struct cbuf cb; | |
119 | int retries; | |
fdda387f | 120 | #define MAX_CONNECT_RETRIES 3 |
5e9ccc37 | 121 | struct hlist_node list; |
fdda387f | 122 | struct connection *othercon; |
1d6e8131 PC |
123 | struct work_struct rwork; /* Receive workqueue */ |
124 | struct work_struct swork; /* Send workqueue */ | |
fdda387f PC |
125 | }; |
126 | #define sock2con(x) ((struct connection *)(x)->sk_user_data) | |
127 | ||
128 | /* An entry waiting to be sent */ | |
129 | struct writequeue_entry { | |
130 | struct list_head list; | |
131 | struct page *page; | |
132 | int offset; | |
133 | int len; | |
134 | int end; | |
135 | int users; | |
136 | struct connection *con; | |
137 | }; | |
138 | ||
36b71a8b DT |
139 | struct dlm_node_addr { |
140 | struct list_head list; | |
141 | int nodeid; | |
142 | int addr_count; | |
98e1b60e | 143 | int curr_addr_index; |
36b71a8b DT |
144 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
145 | }; | |
146 | ||
cc661fc9 BP |
147 | static struct listen_sock_callbacks { |
148 | void (*sk_error_report)(struct sock *); | |
149 | void (*sk_data_ready)(struct sock *); | |
150 | void (*sk_state_change)(struct sock *); | |
151 | void (*sk_write_space)(struct sock *); | |
152 | } listen_sock; | |
153 | ||
36b71a8b DT |
154 | static LIST_HEAD(dlm_node_addrs); |
155 | static DEFINE_SPINLOCK(dlm_node_addrs_spin); | |
156 | ||
6ed7257b PC |
157 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
158 | static int dlm_local_count; | |
513ef596 | 159 | static int dlm_allow_conn; |
fdda387f | 160 | |
1d6e8131 PC |
161 | /* Work queues */ |
162 | static struct workqueue_struct *recv_workqueue; | |
163 | static struct workqueue_struct *send_workqueue; | |
fdda387f | 164 | |
5e9ccc37 | 165 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
7a936ce7 | 166 | static DEFINE_MUTEX(connections_lock); |
c80e7c83 | 167 | static struct kmem_cache *con_cache; |
fdda387f | 168 | |
1d6e8131 PC |
169 | static void process_recv_sockets(struct work_struct *work); |
170 | static void process_send_sockets(struct work_struct *work); | |
fdda387f | 171 | |
5e9ccc37 CC |
172 | |
173 | /* This is deliberately very simple because most clusters have simple | |
174 | sequential nodeids, so we should be able to go straight to a connection | |
175 | struct in the array */ | |
176 | static inline int nodeid_hash(int nodeid) | |
177 | { | |
178 | return nodeid & (CONN_HASH_SIZE-1); | |
179 | } | |
180 | ||
181 | static struct connection *__find_con(int nodeid) | |
182 | { | |
183 | int r; | |
5e9ccc37 CC |
184 | struct connection *con; |
185 | ||
186 | r = nodeid_hash(nodeid); | |
187 | ||
b67bfe0d | 188 | hlist_for_each_entry(con, &connection_hash[r], list) { |
5e9ccc37 CC |
189 | if (con->nodeid == nodeid) |
190 | return con; | |
191 | } | |
192 | return NULL; | |
193 | } | |
194 | ||
6ed7257b PC |
195 | /* |
196 | * If 'allocation' is zero then we don't attempt to create a new | |
197 | * connection structure for this node. | |
198 | */ | |
199 | static struct connection *__nodeid2con(int nodeid, gfp_t alloc) | |
fdda387f PC |
200 | { |
201 | struct connection *con = NULL; | |
6ed7257b | 202 | int r; |
fdda387f | 203 | |
5e9ccc37 | 204 | con = __find_con(nodeid); |
6ed7257b PC |
205 | if (con || !alloc) |
206 | return con; | |
fdda387f | 207 | |
6ed7257b PC |
208 | con = kmem_cache_zalloc(con_cache, alloc); |
209 | if (!con) | |
210 | return NULL; | |
fdda387f | 211 | |
5e9ccc37 CC |
212 | r = nodeid_hash(nodeid); |
213 | hlist_add_head(&con->list, &connection_hash[r]); | |
fdda387f | 214 | |
6ed7257b PC |
215 | con->nodeid = nodeid; |
216 | mutex_init(&con->sock_mutex); | |
217 | INIT_LIST_HEAD(&con->writequeue); | |
218 | spin_lock_init(&con->writequeue_lock); | |
219 | INIT_WORK(&con->swork, process_send_sockets); | |
220 | INIT_WORK(&con->rwork, process_recv_sockets); | |
fdda387f | 221 | |
6ed7257b PC |
222 | /* Setup action pointers for child sockets */ |
223 | if (con->nodeid) { | |
5e9ccc37 | 224 | struct connection *zerocon = __find_con(0); |
fdda387f | 225 | |
6ed7257b PC |
226 | con->connect_action = zerocon->connect_action; |
227 | if (!con->rx_action) | |
228 | con->rx_action = zerocon->rx_action; | |
fdda387f PC |
229 | } |
230 | ||
6ed7257b PC |
231 | return con; |
232 | } | |
233 | ||
5e9ccc37 CC |
234 | /* Loop round all connections */ |
235 | static void foreach_conn(void (*conn_func)(struct connection *c)) | |
236 | { | |
237 | int i; | |
b67bfe0d | 238 | struct hlist_node *n; |
5e9ccc37 CC |
239 | struct connection *con; |
240 | ||
241 | for (i = 0; i < CONN_HASH_SIZE; i++) { | |
b67bfe0d | 242 | hlist_for_each_entry_safe(con, n, &connection_hash[i], list) |
5e9ccc37 | 243 | conn_func(con); |
5e9ccc37 CC |
244 | } |
245 | } | |
246 | ||
6ed7257b PC |
247 | static struct connection *nodeid2con(int nodeid, gfp_t allocation) |
248 | { | |
249 | struct connection *con; | |
250 | ||
7a936ce7 | 251 | mutex_lock(&connections_lock); |
6ed7257b | 252 | con = __nodeid2con(nodeid, allocation); |
7a936ce7 | 253 | mutex_unlock(&connections_lock); |
6ed7257b | 254 | |
fdda387f PC |
255 | return con; |
256 | } | |
257 | ||
36b71a8b DT |
258 | static struct dlm_node_addr *find_node_addr(int nodeid) |
259 | { | |
260 | struct dlm_node_addr *na; | |
261 | ||
262 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
263 | if (na->nodeid == nodeid) | |
264 | return na; | |
265 | } | |
266 | return NULL; | |
267 | } | |
268 | ||
269 | static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) | |
6ed7257b | 270 | { |
36b71a8b DT |
271 | switch (x->ss_family) { |
272 | case AF_INET: { | |
273 | struct sockaddr_in *sinx = (struct sockaddr_in *)x; | |
274 | struct sockaddr_in *siny = (struct sockaddr_in *)y; | |
275 | if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) | |
276 | return 0; | |
277 | if (sinx->sin_port != siny->sin_port) | |
278 | return 0; | |
279 | break; | |
280 | } | |
281 | case AF_INET6: { | |
282 | struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; | |
283 | struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; | |
284 | if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) | |
285 | return 0; | |
286 | if (sinx->sin6_port != siny->sin6_port) | |
287 | return 0; | |
288 | break; | |
289 | } | |
290 | default: | |
291 | return 0; | |
292 | } | |
293 | return 1; | |
294 | } | |
295 | ||
296 | static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, | |
98e1b60e | 297 | struct sockaddr *sa_out, bool try_new_addr) |
36b71a8b DT |
298 | { |
299 | struct sockaddr_storage sas; | |
300 | struct dlm_node_addr *na; | |
6ed7257b PC |
301 | |
302 | if (!dlm_local_count) | |
303 | return -1; | |
304 | ||
36b71a8b DT |
305 | spin_lock(&dlm_node_addrs_spin); |
306 | na = find_node_addr(nodeid); | |
98e1b60e | 307 | if (na && na->addr_count) { |
ee44b4bc MRL |
308 | memcpy(&sas, na->addr[na->curr_addr_index], |
309 | sizeof(struct sockaddr_storage)); | |
310 | ||
98e1b60e MC |
311 | if (try_new_addr) { |
312 | na->curr_addr_index++; | |
313 | if (na->curr_addr_index == na->addr_count) | |
314 | na->curr_addr_index = 0; | |
315 | } | |
98e1b60e | 316 | } |
36b71a8b DT |
317 | spin_unlock(&dlm_node_addrs_spin); |
318 | ||
319 | if (!na) | |
320 | return -EEXIST; | |
321 | ||
322 | if (!na->addr_count) | |
323 | return -ENOENT; | |
324 | ||
325 | if (sas_out) | |
326 | memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); | |
327 | ||
328 | if (!sa_out) | |
329 | return 0; | |
6ed7257b PC |
330 | |
331 | if (dlm_local_addr[0]->ss_family == AF_INET) { | |
36b71a8b DT |
332 | struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; |
333 | struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; | |
6ed7257b PC |
334 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; |
335 | } else { | |
36b71a8b DT |
336 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; |
337 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; | |
4e3fd7a0 | 338 | ret6->sin6_addr = in6->sin6_addr; |
6ed7257b PC |
339 | } |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
36b71a8b DT |
344 | static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) |
345 | { | |
346 | struct dlm_node_addr *na; | |
347 | int rv = -EEXIST; | |
98e1b60e | 348 | int addr_i; |
36b71a8b DT |
349 | |
350 | spin_lock(&dlm_node_addrs_spin); | |
351 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
352 | if (!na->addr_count) | |
353 | continue; | |
354 | ||
98e1b60e MC |
355 | for (addr_i = 0; addr_i < na->addr_count; addr_i++) { |
356 | if (addr_compare(na->addr[addr_i], addr)) { | |
357 | *nodeid = na->nodeid; | |
358 | rv = 0; | |
359 | goto unlock; | |
360 | } | |
361 | } | |
36b71a8b | 362 | } |
98e1b60e | 363 | unlock: |
36b71a8b DT |
364 | spin_unlock(&dlm_node_addrs_spin); |
365 | return rv; | |
366 | } | |
367 | ||
368 | int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) | |
369 | { | |
370 | struct sockaddr_storage *new_addr; | |
371 | struct dlm_node_addr *new_node, *na; | |
372 | ||
373 | new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); | |
374 | if (!new_node) | |
375 | return -ENOMEM; | |
376 | ||
377 | new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); | |
378 | if (!new_addr) { | |
379 | kfree(new_node); | |
380 | return -ENOMEM; | |
381 | } | |
382 | ||
383 | memcpy(new_addr, addr, len); | |
384 | ||
385 | spin_lock(&dlm_node_addrs_spin); | |
386 | na = find_node_addr(nodeid); | |
387 | if (!na) { | |
388 | new_node->nodeid = nodeid; | |
389 | new_node->addr[0] = new_addr; | |
390 | new_node->addr_count = 1; | |
391 | list_add(&new_node->list, &dlm_node_addrs); | |
392 | spin_unlock(&dlm_node_addrs_spin); | |
393 | return 0; | |
394 | } | |
395 | ||
396 | if (na->addr_count >= DLM_MAX_ADDR_COUNT) { | |
397 | spin_unlock(&dlm_node_addrs_spin); | |
398 | kfree(new_addr); | |
399 | kfree(new_node); | |
400 | return -ENOSPC; | |
401 | } | |
402 | ||
403 | na->addr[na->addr_count++] = new_addr; | |
404 | spin_unlock(&dlm_node_addrs_spin); | |
405 | kfree(new_node); | |
406 | return 0; | |
407 | } | |
408 | ||
fdda387f | 409 | /* Data available on socket or listen socket received a connect */ |
676d2369 | 410 | static void lowcomms_data_ready(struct sock *sk) |
fdda387f | 411 | { |
93eaadeb | 412 | struct connection *con; |
413 | ||
414 | read_lock_bh(&sk->sk_callback_lock); | |
415 | con = sock2con(sk); | |
afb853fb | 416 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
1d6e8131 | 417 | queue_work(recv_workqueue, &con->rwork); |
93eaadeb | 418 | read_unlock_bh(&sk->sk_callback_lock); |
fdda387f PC |
419 | } |
420 | ||
421 | static void lowcomms_write_space(struct sock *sk) | |
422 | { | |
93eaadeb | 423 | struct connection *con; |
fdda387f | 424 | |
93eaadeb | 425 | read_lock_bh(&sk->sk_callback_lock); |
426 | con = sock2con(sk); | |
b36930dd | 427 | if (!con) |
93eaadeb | 428 | goto out; |
b36930dd DM |
429 | |
430 | clear_bit(SOCK_NOSPACE, &con->sock->flags); | |
431 | ||
432 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { | |
433 | con->sock->sk->sk_write_pending--; | |
9cd3e072 | 434 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); |
b36930dd DM |
435 | } |
436 | ||
01da24d3 | 437 | queue_work(send_workqueue, &con->swork); |
93eaadeb | 438 | out: |
439 | read_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
440 | } |
441 | ||
442 | static inline void lowcomms_connect_sock(struct connection *con) | |
443 | { | |
063c4c99 LMB |
444 | if (test_bit(CF_CLOSE, &con->flags)) |
445 | return; | |
61d9102b BP |
446 | queue_work(send_workqueue, &con->swork); |
447 | cond_resched(); | |
fdda387f PC |
448 | } |
449 | ||
450 | static void lowcomms_state_change(struct sock *sk) | |
451 | { | |
ee44b4bc MRL |
452 | /* SCTP layer is not calling sk_data_ready when the connection |
453 | * is done, so we catch the signal through here. Also, it | |
454 | * doesn't switch socket state when entering shutdown, so we | |
455 | * skip the write in that case. | |
456 | */ | |
457 | if (sk->sk_shutdown) { | |
458 | if (sk->sk_shutdown == RCV_SHUTDOWN) | |
459 | lowcomms_data_ready(sk); | |
460 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
fdda387f | 461 | lowcomms_write_space(sk); |
ee44b4bc | 462 | } |
fdda387f PC |
463 | } |
464 | ||
391fbdc5 CC |
465 | int dlm_lowcomms_connect_node(int nodeid) |
466 | { | |
467 | struct connection *con; | |
468 | ||
469 | if (nodeid == dlm_our_nodeid()) | |
470 | return 0; | |
471 | ||
472 | con = nodeid2con(nodeid, GFP_NOFS); | |
473 | if (!con) | |
474 | return -ENOMEM; | |
475 | lowcomms_connect_sock(con); | |
476 | return 0; | |
477 | } | |
478 | ||
b3a5bbfd BP |
479 | static void lowcomms_error_report(struct sock *sk) |
480 | { | |
b81171cb | 481 | struct connection *con; |
b3a5bbfd | 482 | struct sockaddr_storage saddr; |
b81171cb | 483 | void (*orig_report)(struct sock *) = NULL; |
b3a5bbfd | 484 | |
b81171cb BP |
485 | read_lock_bh(&sk->sk_callback_lock); |
486 | con = sock2con(sk); | |
487 | if (con == NULL) | |
488 | goto out; | |
489 | ||
cc661fc9 | 490 | orig_report = listen_sock.sk_error_report; |
1a31833d | 491 | if (con->sock == NULL || |
9b2c45d4 | 492 | kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { |
b3a5bbfd BP |
493 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " |
494 | "sending to node %d, port %d, " | |
495 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
496 | con->nodeid, dlm_config.ci_tcp_port, | |
497 | sk->sk_err, sk->sk_err_soft); | |
b3a5bbfd BP |
498 | } else if (saddr.ss_family == AF_INET) { |
499 | struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; | |
500 | ||
501 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
502 | "sending to node %d at %pI4, port %d, " | |
503 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
504 | con->nodeid, &sin4->sin_addr.s_addr, | |
505 | dlm_config.ci_tcp_port, sk->sk_err, | |
506 | sk->sk_err_soft); | |
507 | } else { | |
508 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; | |
509 | ||
510 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
511 | "sending to node %d at %u.%u.%u.%u, " | |
512 | "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), | |
513 | con->nodeid, sin6->sin6_addr.s6_addr32[0], | |
514 | sin6->sin6_addr.s6_addr32[1], | |
515 | sin6->sin6_addr.s6_addr32[2], | |
516 | sin6->sin6_addr.s6_addr32[3], | |
517 | dlm_config.ci_tcp_port, sk->sk_err, | |
518 | sk->sk_err_soft); | |
519 | } | |
b81171cb BP |
520 | out: |
521 | read_unlock_bh(&sk->sk_callback_lock); | |
522 | if (orig_report) | |
523 | orig_report(sk); | |
524 | } | |
525 | ||
526 | /* Note: sk_callback_lock must be locked before calling this function. */ | |
cc661fc9 | 527 | static void save_listen_callbacks(struct socket *sock) |
b81171cb | 528 | { |
cc661fc9 BP |
529 | struct sock *sk = sock->sk; |
530 | ||
531 | listen_sock.sk_data_ready = sk->sk_data_ready; | |
532 | listen_sock.sk_state_change = sk->sk_state_change; | |
533 | listen_sock.sk_write_space = sk->sk_write_space; | |
534 | listen_sock.sk_error_report = sk->sk_error_report; | |
b81171cb BP |
535 | } |
536 | ||
cc661fc9 | 537 | static void restore_callbacks(struct socket *sock) |
b81171cb | 538 | { |
cc661fc9 BP |
539 | struct sock *sk = sock->sk; |
540 | ||
b81171cb | 541 | write_lock_bh(&sk->sk_callback_lock); |
b81171cb | 542 | sk->sk_user_data = NULL; |
cc661fc9 BP |
543 | sk->sk_data_ready = listen_sock.sk_data_ready; |
544 | sk->sk_state_change = listen_sock.sk_state_change; | |
545 | sk->sk_write_space = listen_sock.sk_write_space; | |
546 | sk->sk_error_report = listen_sock.sk_error_report; | |
b81171cb | 547 | write_unlock_bh(&sk->sk_callback_lock); |
b3a5bbfd BP |
548 | } |
549 | ||
fdda387f | 550 | /* Make a socket active */ |
988419a9 | 551 | static void add_sock(struct socket *sock, struct connection *con) |
fdda387f | 552 | { |
b81171cb BP |
553 | struct sock *sk = sock->sk; |
554 | ||
555 | write_lock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
556 | con->sock = sock; |
557 | ||
b81171cb | 558 | sk->sk_user_data = con; |
fdda387f | 559 | /* Install a data_ready callback */ |
b81171cb BP |
560 | sk->sk_data_ready = lowcomms_data_ready; |
561 | sk->sk_write_space = lowcomms_write_space; | |
562 | sk->sk_state_change = lowcomms_state_change; | |
563 | sk->sk_allocation = GFP_NOFS; | |
564 | sk->sk_error_report = lowcomms_error_report; | |
565 | write_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
566 | } |
567 | ||
6ed7257b | 568 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
fdda387f PC |
569 | length */ |
570 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, | |
571 | int *addr_len) | |
572 | { | |
6ed7257b | 573 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
ac33d071 | 574 | if (saddr->ss_family == AF_INET) { |
fdda387f PC |
575 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
576 | in4_addr->sin_port = cpu_to_be16(port); | |
577 | *addr_len = sizeof(struct sockaddr_in); | |
6ed7257b | 578 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
ac33d071 | 579 | } else { |
fdda387f PC |
580 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
581 | in6_addr->sin6_port = cpu_to_be16(port); | |
582 | *addr_len = sizeof(struct sockaddr_in6); | |
583 | } | |
01c8cab2 | 584 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
fdda387f PC |
585 | } |
586 | ||
587 | /* Close a remote connection and tidy up */ | |
0d737a8c MRL |
588 | static void close_connection(struct connection *con, bool and_other, |
589 | bool tx, bool rx) | |
fdda387f | 590 | { |
b2a66629 | 591 | bool closing = test_and_set_bit(CF_CLOSING, &con->flags); |
592 | ||
0aa18464 | 593 | if (tx && !closing && cancel_work_sync(&con->swork)) { |
0d737a8c | 594 | log_print("canceled swork for node %d", con->nodeid); |
0aa18464 | 595 | clear_bit(CF_WRITE_PENDING, &con->flags); |
596 | } | |
597 | if (rx && !closing && cancel_work_sync(&con->rwork)) { | |
0d737a8c | 598 | log_print("canceled rwork for node %d", con->nodeid); |
0aa18464 | 599 | clear_bit(CF_READ_PENDING, &con->flags); |
600 | } | |
fdda387f | 601 | |
0d737a8c | 602 | mutex_lock(&con->sock_mutex); |
fdda387f | 603 | if (con->sock) { |
cc661fc9 | 604 | restore_callbacks(con->sock); |
fdda387f PC |
605 | sock_release(con->sock); |
606 | con->sock = NULL; | |
607 | } | |
608 | if (con->othercon && and_other) { | |
ac33d071 | 609 | /* Will only re-enter once. */ |
0d737a8c | 610 | close_connection(con->othercon, false, true, true); |
fdda387f PC |
611 | } |
612 | if (con->rx_page) { | |
613 | __free_page(con->rx_page); | |
614 | con->rx_page = NULL; | |
615 | } | |
9e5f2825 | 616 | |
61d96be0 PC |
617 | con->retries = 0; |
618 | mutex_unlock(&con->sock_mutex); | |
b2a66629 | 619 | clear_bit(CF_CLOSING, &con->flags); |
fdda387f PC |
620 | } |
621 | ||
622 | /* Data received from remote end */ | |
623 | static int receive_from_sock(struct connection *con) | |
624 | { | |
625 | int ret = 0; | |
58addbff AV |
626 | struct msghdr msg = {}; |
627 | struct kvec iov[2]; | |
fdda387f PC |
628 | unsigned len; |
629 | int r; | |
630 | int call_again_soon = 0; | |
58addbff | 631 | int nvec; |
fdda387f | 632 | |
f1f1c1cc | 633 | mutex_lock(&con->sock_mutex); |
fdda387f | 634 | |
a34fbc63 PC |
635 | if (con->sock == NULL) { |
636 | ret = -EAGAIN; | |
637 | goto out_close; | |
638 | } | |
acee4e52 MRL |
639 | if (con->nodeid == 0) { |
640 | ret = -EINVAL; | |
641 | goto out_close; | |
642 | } | |
a34fbc63 | 643 | |
fdda387f PC |
644 | if (con->rx_page == NULL) { |
645 | /* | |
646 | * This doesn't need to be atomic, but I think it should | |
647 | * improve performance if it is. | |
648 | */ | |
649 | con->rx_page = alloc_page(GFP_ATOMIC); | |
650 | if (con->rx_page == NULL) | |
651 | goto out_resched; | |
09cbfeaf | 652 | cbuf_init(&con->cb, PAGE_SIZE); |
fdda387f PC |
653 | } |
654 | ||
fdda387f PC |
655 | /* |
656 | * iov[0] is the bit of the circular buffer between the current end | |
657 | * point (cb.base + cb.len) and the end of the buffer. | |
658 | */ | |
ac33d071 PC |
659 | iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); |
660 | iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); | |
89adc934 | 661 | iov[1].iov_len = 0; |
58addbff | 662 | nvec = 1; |
fdda387f PC |
663 | |
664 | /* | |
665 | * iov[1] is the bit of the circular buffer between the start of the | |
666 | * buffer and the start of the currently used section (cb.base) | |
667 | */ | |
ac33d071 | 668 | if (cbuf_data(&con->cb) >= con->cb.base) { |
09cbfeaf | 669 | iov[0].iov_len = PAGE_SIZE - cbuf_data(&con->cb); |
fdda387f PC |
670 | iov[1].iov_len = con->cb.base; |
671 | iov[1].iov_base = page_address(con->rx_page); | |
58addbff | 672 | nvec = 2; |
fdda387f PC |
673 | } |
674 | len = iov[0].iov_len + iov[1].iov_len; | |
aa563d7b | 675 | iov_iter_kvec(&msg.msg_iter, READ, iov, nvec, len); |
fdda387f | 676 | |
c8c7840e | 677 | r = ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT | MSG_NOSIGNAL); |
fdda387f PC |
678 | if (ret <= 0) |
679 | goto out_close; | |
ee44b4bc MRL |
680 | else if (ret == len) |
681 | call_again_soon = 1; | |
bd44e2b0 | 682 | |
ac33d071 | 683 | cbuf_add(&con->cb, ret); |
fdda387f PC |
684 | ret = dlm_process_incoming_buffer(con->nodeid, |
685 | page_address(con->rx_page), | |
686 | con->cb.base, con->cb.len, | |
09cbfeaf | 687 | PAGE_SIZE); |
fdda387f | 688 | if (ret == -EBADMSG) { |
ee44b4bc MRL |
689 | log_print("lowcomms: addr=%p, base=%u, len=%u, read=%d", |
690 | page_address(con->rx_page), con->cb.base, | |
691 | con->cb.len, r); | |
fdda387f PC |
692 | } |
693 | if (ret < 0) | |
694 | goto out_close; | |
ac33d071 | 695 | cbuf_eat(&con->cb, ret); |
fdda387f | 696 | |
ac33d071 | 697 | if (cbuf_empty(&con->cb) && !call_again_soon) { |
fdda387f PC |
698 | __free_page(con->rx_page); |
699 | con->rx_page = NULL; | |
700 | } | |
701 | ||
fdda387f PC |
702 | if (call_again_soon) |
703 | goto out_resched; | |
f1f1c1cc | 704 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 705 | return 0; |
fdda387f | 706 | |
ac33d071 | 707 | out_resched: |
1d6e8131 PC |
708 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
709 | queue_work(recv_workqueue, &con->rwork); | |
f1f1c1cc | 710 | mutex_unlock(&con->sock_mutex); |
bd44e2b0 | 711 | return -EAGAIN; |
fdda387f | 712 | |
ac33d071 | 713 | out_close: |
f1f1c1cc | 714 | mutex_unlock(&con->sock_mutex); |
9e5f2825 | 715 | if (ret != -EAGAIN) { |
c553e173 | 716 | close_connection(con, true, true, false); |
fdda387f PC |
717 | /* Reconnect when there is something to send */ |
718 | } | |
a34fbc63 PC |
719 | /* Don't return success if we really got EOF */ |
720 | if (ret == 0) | |
721 | ret = -EAGAIN; | |
fdda387f | 722 | |
fdda387f PC |
723 | return ret; |
724 | } | |
725 | ||
726 | /* Listening socket is busy, accept a connection */ | |
0774dc76 | 727 | static int accept_from_sock(struct connection *con) |
fdda387f PC |
728 | { |
729 | int result; | |
730 | struct sockaddr_storage peeraddr; | |
731 | struct socket *newsock; | |
732 | int len; | |
733 | int nodeid; | |
734 | struct connection *newcon; | |
bd44e2b0 | 735 | struct connection *addcon; |
fdda387f | 736 | |
513ef596 DT |
737 | mutex_lock(&connections_lock); |
738 | if (!dlm_allow_conn) { | |
739 | mutex_unlock(&connections_lock); | |
740 | return -1; | |
741 | } | |
742 | mutex_unlock(&connections_lock); | |
743 | ||
f1f1c1cc | 744 | mutex_lock_nested(&con->sock_mutex, 0); |
fdda387f | 745 | |
3421fb15 | 746 | if (!con->sock) { |
747 | mutex_unlock(&con->sock_mutex); | |
748 | return -ENOTCONN; | |
749 | } | |
fdda387f | 750 | |
3421fb15 | 751 | result = kernel_accept(con->sock, &newsock, O_NONBLOCK); |
fdda387f PC |
752 | if (result < 0) |
753 | goto accept_err; | |
754 | ||
755 | /* Get the connected socket's peer */ | |
756 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
9b2c45d4 DV |
757 | len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); |
758 | if (len < 0) { | |
fdda387f PC |
759 | result = -ECONNABORTED; |
760 | goto accept_err; | |
761 | } | |
762 | ||
763 | /* Get the new node's NODEID */ | |
764 | make_sockaddr(&peeraddr, 0, &len); | |
36b71a8b | 765 | if (addr_to_nodeid(&peeraddr, &nodeid)) { |
bcaadf5c | 766 | unsigned char *b=(unsigned char *)&peeraddr; |
617e82e1 | 767 | log_print("connect from non cluster node"); |
bcaadf5c MY |
768 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
769 | b, sizeof(struct sockaddr_storage)); | |
fdda387f | 770 | sock_release(newsock); |
f1f1c1cc | 771 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
772 | return -1; |
773 | } | |
774 | ||
775 | log_print("got connection from %d", nodeid); | |
776 | ||
777 | /* Check to see if we already have a connection to this node. This | |
778 | * could happen if the two nodes initiate a connection at roughly | |
779 | * the same time and the connections cross on the wire. | |
fdda387f PC |
780 | * In this case we store the incoming one in "othercon" |
781 | */ | |
748285cc | 782 | newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f PC |
783 | if (!newcon) { |
784 | result = -ENOMEM; | |
785 | goto accept_err; | |
786 | } | |
f1f1c1cc | 787 | mutex_lock_nested(&newcon->sock_mutex, 1); |
fdda387f | 788 | if (newcon->sock) { |
ac33d071 | 789 | struct connection *othercon = newcon->othercon; |
fdda387f PC |
790 | |
791 | if (!othercon) { | |
748285cc | 792 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
fdda387f | 793 | if (!othercon) { |
617e82e1 | 794 | log_print("failed to allocate incoming socket"); |
f1f1c1cc | 795 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
796 | result = -ENOMEM; |
797 | goto accept_err; | |
798 | } | |
fdda387f PC |
799 | othercon->nodeid = nodeid; |
800 | othercon->rx_action = receive_from_sock; | |
f1f1c1cc | 801 | mutex_init(&othercon->sock_mutex); |
26b41099 | 802 | INIT_LIST_HEAD(&othercon->writequeue); |
803 | spin_lock_init(&othercon->writequeue_lock); | |
1d6e8131 PC |
804 | INIT_WORK(&othercon->swork, process_send_sockets); |
805 | INIT_WORK(&othercon->rwork, process_recv_sockets); | |
fdda387f | 806 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
61d96be0 | 807 | } |
c7355827 | 808 | mutex_lock_nested(&othercon->sock_mutex, 2); |
61d96be0 | 809 | if (!othercon->sock) { |
fdda387f | 810 | newcon->othercon = othercon; |
988419a9 | 811 | add_sock(newsock, othercon); |
97d84836 | 812 | addcon = othercon; |
c7355827 | 813 | mutex_unlock(&othercon->sock_mutex); |
97d84836 PC |
814 | } |
815 | else { | |
816 | printk("Extra connection from node %d attempted\n", nodeid); | |
817 | result = -EAGAIN; | |
c7355827 | 818 | mutex_unlock(&othercon->sock_mutex); |
f4fadb23 | 819 | mutex_unlock(&newcon->sock_mutex); |
97d84836 | 820 | goto accept_err; |
fdda387f | 821 | } |
fdda387f PC |
822 | } |
823 | else { | |
fdda387f | 824 | newcon->rx_action = receive_from_sock; |
3735b4b9 BP |
825 | /* accept copies the sk after we've saved the callbacks, so we |
826 | don't want to save them a second time or comm errors will | |
827 | result in calling sk_error_report recursively. */ | |
988419a9 | 828 | add_sock(newsock, newcon); |
bd44e2b0 | 829 | addcon = newcon; |
fdda387f PC |
830 | } |
831 | ||
f1f1c1cc | 832 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
833 | |
834 | /* | |
835 | * Add it to the active queue in case we got data | |
25985edc | 836 | * between processing the accept adding the socket |
fdda387f PC |
837 | * to the read_sockets list |
838 | */ | |
bd44e2b0 PC |
839 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
840 | queue_work(recv_workqueue, &addcon->rwork); | |
f1f1c1cc | 841 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
842 | |
843 | return 0; | |
844 | ||
ac33d071 | 845 | accept_err: |
f1f1c1cc | 846 | mutex_unlock(&con->sock_mutex); |
3421fb15 | 847 | if (newsock) |
848 | sock_release(newsock); | |
fdda387f PC |
849 | |
850 | if (result != -EAGAIN) | |
617e82e1 | 851 | log_print("error accepting connection from node: %d", result); |
fdda387f PC |
852 | return result; |
853 | } | |
854 | ||
6ed7257b PC |
855 | static void free_entry(struct writequeue_entry *e) |
856 | { | |
857 | __free_page(e->page); | |
858 | kfree(e); | |
859 | } | |
860 | ||
5d689871 MC |
861 | /* |
862 | * writequeue_entry_complete - try to delete and free write queue entry | |
863 | * @e: write queue entry to try to delete | |
864 | * @completed: bytes completed | |
865 | * | |
866 | * writequeue_lock must be held. | |
867 | */ | |
868 | static void writequeue_entry_complete(struct writequeue_entry *e, int completed) | |
869 | { | |
870 | e->offset += completed; | |
871 | e->len -= completed; | |
872 | ||
873 | if (e->len == 0 && e->users == 0) { | |
874 | list_del(&e->list); | |
875 | free_entry(e); | |
876 | } | |
877 | } | |
878 | ||
ee44b4bc MRL |
879 | /* |
880 | * sctp_bind_addrs - bind a SCTP socket to all our addresses | |
881 | */ | |
882 | static int sctp_bind_addrs(struct connection *con, uint16_t port) | |
883 | { | |
884 | struct sockaddr_storage localaddr; | |
885 | int i, addr_len, result = 0; | |
886 | ||
887 | for (i = 0; i < dlm_local_count; i++) { | |
888 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); | |
889 | make_sockaddr(&localaddr, port, &addr_len); | |
890 | ||
891 | if (!i) | |
892 | result = kernel_bind(con->sock, | |
893 | (struct sockaddr *)&localaddr, | |
894 | addr_len); | |
895 | else | |
896 | result = kernel_setsockopt(con->sock, SOL_SCTP, | |
897 | SCTP_SOCKOPT_BINDX_ADD, | |
898 | (char *)&localaddr, addr_len); | |
899 | ||
900 | if (result < 0) { | |
901 | log_print("Can't bind to %d addr number %d, %d.\n", | |
902 | port, i + 1, result); | |
903 | break; | |
904 | } | |
905 | } | |
906 | return result; | |
907 | } | |
908 | ||
6ed7257b PC |
909 | /* Initiate an SCTP association. |
910 | This is a special case of send_to_sock() in that we don't yet have a | |
911 | peeled-off socket for this association, so we use the listening socket | |
912 | and add the primary IP address of the remote node. | |
913 | */ | |
ee44b4bc | 914 | static void sctp_connect_to_sock(struct connection *con) |
6ed7257b | 915 | { |
ee44b4bc | 916 | struct sockaddr_storage daddr; |
ee44b4bc MRL |
917 | int result; |
918 | int addr_len; | |
919 | struct socket *sock; | |
920 | ||
921 | if (con->nodeid == 0) { | |
922 | log_print("attempt to connect sock 0 foiled"); | |
923 | return; | |
924 | } | |
6ed7257b | 925 | |
5d689871 | 926 | mutex_lock(&con->sock_mutex); |
6ed7257b | 927 | |
ee44b4bc MRL |
928 | /* Some odd races can cause double-connects, ignore them */ |
929 | if (con->retries++ > MAX_CONNECT_RETRIES) | |
930 | goto out; | |
931 | ||
932 | if (con->sock) { | |
933 | log_print("node %d already connected.", con->nodeid); | |
934 | goto out; | |
935 | } | |
936 | ||
937 | memset(&daddr, 0, sizeof(daddr)); | |
938 | result = nodeid_to_addr(con->nodeid, &daddr, NULL, true); | |
939 | if (result < 0) { | |
6ed7257b | 940 | log_print("no address for nodeid %d", con->nodeid); |
ee44b4bc | 941 | goto out; |
6ed7257b | 942 | } |
6ed7257b | 943 | |
ee44b4bc MRL |
944 | /* Create a socket to communicate with */ |
945 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, | |
946 | SOCK_STREAM, IPPROTO_SCTP, &sock); | |
947 | if (result < 0) | |
948 | goto socket_err; | |
6ed7257b | 949 | |
ee44b4bc MRL |
950 | con->rx_action = receive_from_sock; |
951 | con->connect_action = sctp_connect_to_sock; | |
988419a9 | 952 | add_sock(sock, con); |
6ed7257b | 953 | |
ee44b4bc MRL |
954 | /* Bind to all addresses. */ |
955 | if (sctp_bind_addrs(con, 0)) | |
956 | goto bind_err; | |
6ed7257b | 957 | |
ee44b4bc | 958 | make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); |
6ed7257b | 959 | |
ee44b4bc | 960 | log_print("connecting to %d", con->nodeid); |
6ed7257b | 961 | |
ee44b4bc | 962 | /* Turn off Nagle's algorithm */ |
40ef92c6 | 963 | sctp_sock_set_nodelay(sock->sk); |
6ed7257b | 964 | |
f706d830 GH |
965 | /* |
966 | * Make sock->ops->connect() function return in specified time, | |
967 | * since O_NONBLOCK argument in connect() function does not work here, | |
968 | * then, we should restore the default value of this attribute. | |
969 | */ | |
76ee0785 | 970 | sock_set_sndtimeo(sock->sk, 5); |
ee44b4bc | 971 | result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, |
da3627c3 | 972 | 0); |
76ee0785 | 973 | sock_set_sndtimeo(sock->sk, 0); |
f706d830 | 974 | |
ee44b4bc MRL |
975 | if (result == -EINPROGRESS) |
976 | result = 0; | |
977 | if (result == 0) | |
978 | goto out; | |
98e1b60e | 979 | |
ee44b4bc MRL |
980 | bind_err: |
981 | con->sock = NULL; | |
982 | sock_release(sock); | |
6ed7257b | 983 | |
ee44b4bc MRL |
984 | socket_err: |
985 | /* | |
986 | * Some errors are fatal and this list might need adjusting. For other | |
987 | * errors we try again until the max number of retries is reached. | |
988 | */ | |
989 | if (result != -EHOSTUNREACH && | |
990 | result != -ENETUNREACH && | |
991 | result != -ENETDOWN && | |
992 | result != -EINVAL && | |
993 | result != -EPROTONOSUPPORT) { | |
994 | log_print("connect %d try %d error %d", con->nodeid, | |
995 | con->retries, result); | |
996 | mutex_unlock(&con->sock_mutex); | |
997 | msleep(1000); | |
ee44b4bc MRL |
998 | lowcomms_connect_sock(con); |
999 | return; | |
6ed7257b | 1000 | } |
5d689871 | 1001 | |
ee44b4bc | 1002 | out: |
5d689871 | 1003 | mutex_unlock(&con->sock_mutex); |
6ed7257b PC |
1004 | } |
1005 | ||
fdda387f | 1006 | /* Connect a new socket to its peer */ |
6ed7257b | 1007 | static void tcp_connect_to_sock(struct connection *con) |
fdda387f | 1008 | { |
6bd8feda | 1009 | struct sockaddr_storage saddr, src_addr; |
fdda387f | 1010 | int addr_len; |
a89d63a1 | 1011 | struct socket *sock = NULL; |
36b71a8b | 1012 | int result; |
fdda387f PC |
1013 | |
1014 | if (con->nodeid == 0) { | |
1015 | log_print("attempt to connect sock 0 foiled"); | |
ac33d071 | 1016 | return; |
fdda387f PC |
1017 | } |
1018 | ||
f1f1c1cc | 1019 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1020 | if (con->retries++ > MAX_CONNECT_RETRIES) |
1021 | goto out; | |
1022 | ||
1023 | /* Some odd races can cause double-connects, ignore them */ | |
36b71a8b | 1024 | if (con->sock) |
fdda387f | 1025 | goto out; |
fdda387f PC |
1026 | |
1027 | /* Create a socket to communicate with */ | |
eeb1bd5c EB |
1028 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
1029 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
fdda387f PC |
1030 | if (result < 0) |
1031 | goto out_err; | |
1032 | ||
1033 | memset(&saddr, 0, sizeof(saddr)); | |
98e1b60e | 1034 | result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); |
36b71a8b DT |
1035 | if (result < 0) { |
1036 | log_print("no address for nodeid %d", con->nodeid); | |
ac33d071 | 1037 | goto out_err; |
36b71a8b | 1038 | } |
fdda387f | 1039 | |
fdda387f | 1040 | con->rx_action = receive_from_sock; |
6ed7257b | 1041 | con->connect_action = tcp_connect_to_sock; |
988419a9 | 1042 | add_sock(sock, con); |
fdda387f | 1043 | |
6bd8feda LH |
1044 | /* Bind to our cluster-known address connecting to avoid |
1045 | routing problems */ | |
1046 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); | |
1047 | make_sockaddr(&src_addr, 0, &addr_len); | |
1048 | result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, | |
1049 | addr_len); | |
1050 | if (result < 0) { | |
1051 | log_print("could not bind for connect: %d", result); | |
1052 | /* This *may* not indicate a critical error */ | |
1053 | } | |
1054 | ||
68c817a1 | 1055 | make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f | 1056 | |
fdda387f | 1057 | log_print("connecting to %d", con->nodeid); |
cb2d45da DT |
1058 | |
1059 | /* Turn off Nagle's algorithm */ | |
12abc5ee | 1060 | tcp_sock_set_nodelay(sock->sk); |
cb2d45da | 1061 | |
36b71a8b | 1062 | result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, |
ac33d071 | 1063 | O_NONBLOCK); |
fdda387f PC |
1064 | if (result == -EINPROGRESS) |
1065 | result = 0; | |
ac33d071 PC |
1066 | if (result == 0) |
1067 | goto out; | |
fdda387f | 1068 | |
ac33d071 | 1069 | out_err: |
fdda387f PC |
1070 | if (con->sock) { |
1071 | sock_release(con->sock); | |
1072 | con->sock = NULL; | |
a89d63a1 CD |
1073 | } else if (sock) { |
1074 | sock_release(sock); | |
fdda387f PC |
1075 | } |
1076 | /* | |
1077 | * Some errors are fatal and this list might need adjusting. For other | |
1078 | * errors we try again until the max number of retries is reached. | |
1079 | */ | |
36b71a8b DT |
1080 | if (result != -EHOSTUNREACH && |
1081 | result != -ENETUNREACH && | |
1082 | result != -ENETDOWN && | |
1083 | result != -EINVAL && | |
1084 | result != -EPROTONOSUPPORT) { | |
1085 | log_print("connect %d try %d error %d", con->nodeid, | |
1086 | con->retries, result); | |
1087 | mutex_unlock(&con->sock_mutex); | |
1088 | msleep(1000); | |
fdda387f | 1089 | lowcomms_connect_sock(con); |
36b71a8b | 1090 | return; |
fdda387f | 1091 | } |
ac33d071 | 1092 | out: |
f1f1c1cc | 1093 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1094 | return; |
fdda387f PC |
1095 | } |
1096 | ||
6ed7257b PC |
1097 | static struct socket *tcp_create_listen_sock(struct connection *con, |
1098 | struct sockaddr_storage *saddr) | |
fdda387f | 1099 | { |
ac33d071 | 1100 | struct socket *sock = NULL; |
fdda387f | 1101 | int result = 0; |
fdda387f PC |
1102 | int addr_len; |
1103 | ||
6ed7257b | 1104 | if (dlm_local_addr[0]->ss_family == AF_INET) |
fdda387f PC |
1105 | addr_len = sizeof(struct sockaddr_in); |
1106 | else | |
1107 | addr_len = sizeof(struct sockaddr_in6); | |
1108 | ||
1109 | /* Create a socket to communicate with */ | |
eeb1bd5c EB |
1110 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
1111 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
fdda387f | 1112 | if (result < 0) { |
617e82e1 | 1113 | log_print("Can't create listening comms socket"); |
fdda387f PC |
1114 | goto create_out; |
1115 | } | |
1116 | ||
cb2d45da | 1117 | /* Turn off Nagle's algorithm */ |
12abc5ee | 1118 | tcp_sock_set_nodelay(sock->sk); |
cb2d45da | 1119 | |
b58f0e8f | 1120 | sock_set_reuseaddr(sock->sk); |
6ed7257b | 1121 | |
93eaadeb | 1122 | write_lock_bh(&sock->sk->sk_callback_lock); |
b81171cb | 1123 | sock->sk->sk_user_data = con; |
cc661fc9 | 1124 | save_listen_callbacks(sock); |
0774dc76 | 1125 | con->rx_action = accept_from_sock; |
6ed7257b | 1126 | con->connect_action = tcp_connect_to_sock; |
93eaadeb | 1127 | write_unlock_bh(&sock->sk->sk_callback_lock); |
fdda387f PC |
1128 | |
1129 | /* Bind to our port */ | |
68c817a1 | 1130 | make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f PC |
1131 | result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); |
1132 | if (result < 0) { | |
617e82e1 | 1133 | log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1134 | sock_release(sock); |
1135 | sock = NULL; | |
1136 | con->sock = NULL; | |
1137 | goto create_out; | |
1138 | } | |
ce3d9544 | 1139 | sock_set_keepalive(sock->sk); |
fdda387f PC |
1140 | |
1141 | result = sock->ops->listen(sock, 5); | |
1142 | if (result < 0) { | |
617e82e1 | 1143 | log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1144 | sock_release(sock); |
1145 | sock = NULL; | |
1146 | goto create_out; | |
1147 | } | |
1148 | ||
ac33d071 | 1149 | create_out: |
fdda387f PC |
1150 | return sock; |
1151 | } | |
1152 | ||
6ed7257b PC |
1153 | /* Get local addresses */ |
1154 | static void init_local(void) | |
1155 | { | |
1156 | struct sockaddr_storage sas, *addr; | |
1157 | int i; | |
1158 | ||
30d3a237 | 1159 | dlm_local_count = 0; |
1b189b88 | 1160 | for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { |
6ed7257b PC |
1161 | if (dlm_our_addr(&sas, i)) |
1162 | break; | |
1163 | ||
5c93f56f | 1164 | addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); |
6ed7257b PC |
1165 | if (!addr) |
1166 | break; | |
6ed7257b PC |
1167 | dlm_local_addr[dlm_local_count++] = addr; |
1168 | } | |
1169 | } | |
1170 | ||
6ed7257b PC |
1171 | /* Initialise SCTP socket and bind to all interfaces */ |
1172 | static int sctp_listen_for_all(void) | |
1173 | { | |
1174 | struct socket *sock = NULL; | |
ee44b4bc | 1175 | int result = -EINVAL; |
573c24c4 | 1176 | struct connection *con = nodeid2con(0, GFP_NOFS); |
6ed7257b PC |
1177 | |
1178 | if (!con) | |
1179 | return -ENOMEM; | |
1180 | ||
1181 | log_print("Using SCTP for communications"); | |
1182 | ||
eeb1bd5c | 1183 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
ee44b4bc | 1184 | SOCK_STREAM, IPPROTO_SCTP, &sock); |
6ed7257b PC |
1185 | if (result < 0) { |
1186 | log_print("Can't create comms socket, check SCTP is loaded"); | |
1187 | goto out; | |
1188 | } | |
1189 | ||
26cfabf9 | 1190 | sock_set_rcvbuf(sock->sk, NEEDED_RMEM); |
40ef92c6 | 1191 | sctp_sock_set_nodelay(sock->sk); |
86e92ad2 | 1192 | |
b81171cb | 1193 | write_lock_bh(&sock->sk->sk_callback_lock); |
6ed7257b PC |
1194 | /* Init con struct */ |
1195 | sock->sk->sk_user_data = con; | |
cc661fc9 | 1196 | save_listen_callbacks(sock); |
6ed7257b PC |
1197 | con->sock = sock; |
1198 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
0774dc76 | 1199 | con->rx_action = accept_from_sock; |
ee44b4bc | 1200 | con->connect_action = sctp_connect_to_sock; |
6ed7257b | 1201 | |
b81171cb BP |
1202 | write_unlock_bh(&sock->sk->sk_callback_lock); |
1203 | ||
ee44b4bc MRL |
1204 | /* Bind to all addresses. */ |
1205 | if (sctp_bind_addrs(con, dlm_config.ci_tcp_port)) | |
1206 | goto create_delsock; | |
6ed7257b PC |
1207 | |
1208 | result = sock->ops->listen(sock, 5); | |
1209 | if (result < 0) { | |
1210 | log_print("Can't set socket listening"); | |
1211 | goto create_delsock; | |
1212 | } | |
1213 | ||
1214 | return 0; | |
1215 | ||
1216 | create_delsock: | |
1217 | sock_release(sock); | |
1218 | con->sock = NULL; | |
1219 | out: | |
1220 | return result; | |
1221 | } | |
1222 | ||
1223 | static int tcp_listen_for_all(void) | |
fdda387f PC |
1224 | { |
1225 | struct socket *sock = NULL; | |
573c24c4 | 1226 | struct connection *con = nodeid2con(0, GFP_NOFS); |
fdda387f PC |
1227 | int result = -EINVAL; |
1228 | ||
6ed7257b PC |
1229 | if (!con) |
1230 | return -ENOMEM; | |
1231 | ||
fdda387f | 1232 | /* We don't support multi-homed hosts */ |
6ed7257b | 1233 | if (dlm_local_addr[1] != NULL) { |
617e82e1 DT |
1234 | log_print("TCP protocol can't handle multi-homed hosts, " |
1235 | "try SCTP"); | |
6ed7257b PC |
1236 | return -EINVAL; |
1237 | } | |
1238 | ||
1239 | log_print("Using TCP for communications"); | |
1240 | ||
6ed7257b | 1241 | sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
fdda387f | 1242 | if (sock) { |
988419a9 | 1243 | add_sock(sock, con); |
fdda387f PC |
1244 | result = 0; |
1245 | } | |
1246 | else { | |
1247 | result = -EADDRINUSE; | |
1248 | } | |
1249 | ||
1250 | return result; | |
1251 | } | |
1252 | ||
1253 | ||
1254 | ||
1255 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, | |
1256 | gfp_t allocation) | |
1257 | { | |
1258 | struct writequeue_entry *entry; | |
1259 | ||
1260 | entry = kmalloc(sizeof(struct writequeue_entry), allocation); | |
1261 | if (!entry) | |
1262 | return NULL; | |
1263 | ||
1264 | entry->page = alloc_page(allocation); | |
1265 | if (!entry->page) { | |
1266 | kfree(entry); | |
1267 | return NULL; | |
1268 | } | |
1269 | ||
1270 | entry->offset = 0; | |
1271 | entry->len = 0; | |
1272 | entry->end = 0; | |
1273 | entry->users = 0; | |
1274 | entry->con = con; | |
1275 | ||
1276 | return entry; | |
1277 | } | |
1278 | ||
617e82e1 | 1279 | void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
fdda387f PC |
1280 | { |
1281 | struct connection *con; | |
1282 | struct writequeue_entry *e; | |
1283 | int offset = 0; | |
fdda387f | 1284 | |
fdda387f PC |
1285 | con = nodeid2con(nodeid, allocation); |
1286 | if (!con) | |
1287 | return NULL; | |
1288 | ||
4edde74e | 1289 | spin_lock(&con->writequeue_lock); |
fdda387f | 1290 | e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
ac33d071 | 1291 | if ((&e->list == &con->writequeue) || |
09cbfeaf | 1292 | (PAGE_SIZE - e->end < len)) { |
fdda387f PC |
1293 | e = NULL; |
1294 | } else { | |
1295 | offset = e->end; | |
1296 | e->end += len; | |
eeee2b5f | 1297 | e->users++; |
fdda387f PC |
1298 | } |
1299 | spin_unlock(&con->writequeue_lock); | |
1300 | ||
1301 | if (e) { | |
ac33d071 | 1302 | got_one: |
fdda387f PC |
1303 | *ppc = page_address(e->page) + offset; |
1304 | return e; | |
1305 | } | |
1306 | ||
1307 | e = new_writequeue_entry(con, allocation); | |
1308 | if (e) { | |
1309 | spin_lock(&con->writequeue_lock); | |
1310 | offset = e->end; | |
1311 | e->end += len; | |
eeee2b5f | 1312 | e->users++; |
fdda387f PC |
1313 | list_add_tail(&e->list, &con->writequeue); |
1314 | spin_unlock(&con->writequeue_lock); | |
1315 | goto got_one; | |
1316 | } | |
1317 | return NULL; | |
1318 | } | |
1319 | ||
1320 | void dlm_lowcomms_commit_buffer(void *mh) | |
1321 | { | |
1322 | struct writequeue_entry *e = (struct writequeue_entry *)mh; | |
1323 | struct connection *con = e->con; | |
1324 | int users; | |
1325 | ||
4edde74e | 1326 | spin_lock(&con->writequeue_lock); |
fdda387f PC |
1327 | users = --e->users; |
1328 | if (users) | |
1329 | goto out; | |
1330 | e->len = e->end - e->offset; | |
fdda387f PC |
1331 | spin_unlock(&con->writequeue_lock); |
1332 | ||
01da24d3 | 1333 | queue_work(send_workqueue, &con->swork); |
fdda387f PC |
1334 | return; |
1335 | ||
ac33d071 | 1336 | out: |
fdda387f PC |
1337 | spin_unlock(&con->writequeue_lock); |
1338 | return; | |
1339 | } | |
1340 | ||
fdda387f | 1341 | /* Send a message */ |
ac33d071 | 1342 | static void send_to_sock(struct connection *con) |
fdda387f PC |
1343 | { |
1344 | int ret = 0; | |
fdda387f PC |
1345 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1346 | struct writequeue_entry *e; | |
1347 | int len, offset; | |
f92c8dd7 | 1348 | int count = 0; |
fdda387f | 1349 | |
f1f1c1cc | 1350 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1351 | if (con->sock == NULL) |
1352 | goto out_connect; | |
1353 | ||
fdda387f PC |
1354 | spin_lock(&con->writequeue_lock); |
1355 | for (;;) { | |
1356 | e = list_entry(con->writequeue.next, struct writequeue_entry, | |
1357 | list); | |
1358 | if ((struct list_head *) e == &con->writequeue) | |
1359 | break; | |
1360 | ||
1361 | len = e->len; | |
1362 | offset = e->offset; | |
1363 | BUG_ON(len == 0 && e->users == 0); | |
1364 | spin_unlock(&con->writequeue_lock); | |
1365 | ||
1366 | ret = 0; | |
1367 | if (len) { | |
1329e3f2 PB |
1368 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
1369 | msg_flags); | |
d66f8277 | 1370 | if (ret == -EAGAIN || ret == 0) { |
b36930dd | 1371 | if (ret == -EAGAIN && |
9cd3e072 | 1372 | test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && |
b36930dd DM |
1373 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { |
1374 | /* Notify TCP that we're limited by the | |
1375 | * application window size. | |
1376 | */ | |
1377 | set_bit(SOCK_NOSPACE, &con->sock->flags); | |
1378 | con->sock->sk->sk_write_pending++; | |
1379 | } | |
d66f8277 | 1380 | cond_resched(); |
fdda387f | 1381 | goto out; |
9c5bef58 | 1382 | } else if (ret < 0) |
fdda387f | 1383 | goto send_error; |
d66f8277 | 1384 | } |
f92c8dd7 BP |
1385 | |
1386 | /* Don't starve people filling buffers */ | |
1387 | if (++count >= MAX_SEND_MSG_COUNT) { | |
ac33d071 | 1388 | cond_resched(); |
f92c8dd7 BP |
1389 | count = 0; |
1390 | } | |
fdda387f PC |
1391 | |
1392 | spin_lock(&con->writequeue_lock); | |
5d689871 | 1393 | writequeue_entry_complete(e, ret); |
fdda387f PC |
1394 | } |
1395 | spin_unlock(&con->writequeue_lock); | |
ac33d071 | 1396 | out: |
f1f1c1cc | 1397 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1398 | return; |
fdda387f | 1399 | |
ac33d071 | 1400 | send_error: |
f1f1c1cc | 1401 | mutex_unlock(&con->sock_mutex); |
c553e173 | 1402 | close_connection(con, true, false, true); |
01da24d3 BP |
1403 | /* Requeue the send work. When the work daemon runs again, it will try |
1404 | a new connection, then call this function again. */ | |
1405 | queue_work(send_workqueue, &con->swork); | |
ac33d071 | 1406 | return; |
fdda387f | 1407 | |
ac33d071 | 1408 | out_connect: |
f1f1c1cc | 1409 | mutex_unlock(&con->sock_mutex); |
01da24d3 BP |
1410 | queue_work(send_workqueue, &con->swork); |
1411 | cond_resched(); | |
fdda387f PC |
1412 | } |
1413 | ||
1414 | static void clean_one_writequeue(struct connection *con) | |
1415 | { | |
5e9ccc37 | 1416 | struct writequeue_entry *e, *safe; |
fdda387f PC |
1417 | |
1418 | spin_lock(&con->writequeue_lock); | |
5e9ccc37 | 1419 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f PC |
1420 | list_del(&e->list); |
1421 | free_entry(e); | |
1422 | } | |
1423 | spin_unlock(&con->writequeue_lock); | |
1424 | } | |
1425 | ||
1426 | /* Called from recovery when it knows that a node has | |
1427 | left the cluster */ | |
1428 | int dlm_lowcomms_close(int nodeid) | |
1429 | { | |
1430 | struct connection *con; | |
36b71a8b | 1431 | struct dlm_node_addr *na; |
fdda387f | 1432 | |
fdda387f PC |
1433 | log_print("closing connection to node %d", nodeid); |
1434 | con = nodeid2con(nodeid, 0); | |
1435 | if (con) { | |
063c4c99 | 1436 | set_bit(CF_CLOSE, &con->flags); |
0d737a8c | 1437 | close_connection(con, true, true, true); |
fdda387f | 1438 | clean_one_writequeue(con); |
fdda387f | 1439 | } |
36b71a8b DT |
1440 | |
1441 | spin_lock(&dlm_node_addrs_spin); | |
1442 | na = find_node_addr(nodeid); | |
1443 | if (na) { | |
1444 | list_del(&na->list); | |
1445 | while (na->addr_count--) | |
1446 | kfree(na->addr[na->addr_count]); | |
1447 | kfree(na); | |
1448 | } | |
1449 | spin_unlock(&dlm_node_addrs_spin); | |
1450 | ||
fdda387f | 1451 | return 0; |
fdda387f PC |
1452 | } |
1453 | ||
6ed7257b | 1454 | /* Receive workqueue function */ |
1d6e8131 | 1455 | static void process_recv_sockets(struct work_struct *work) |
fdda387f | 1456 | { |
1d6e8131 PC |
1457 | struct connection *con = container_of(work, struct connection, rwork); |
1458 | int err; | |
fdda387f | 1459 | |
1d6e8131 PC |
1460 | clear_bit(CF_READ_PENDING, &con->flags); |
1461 | do { | |
1462 | err = con->rx_action(con); | |
1463 | } while (!err); | |
fdda387f PC |
1464 | } |
1465 | ||
6ed7257b | 1466 | /* Send workqueue function */ |
1d6e8131 | 1467 | static void process_send_sockets(struct work_struct *work) |
fdda387f | 1468 | { |
1d6e8131 | 1469 | struct connection *con = container_of(work, struct connection, swork); |
fdda387f | 1470 | |
8a4abb08 | 1471 | clear_bit(CF_WRITE_PENDING, &con->flags); |
61d9102b | 1472 | if (con->sock == NULL) /* not mutex protected so check it inside too */ |
6ed7257b | 1473 | con->connect_action(con); |
01da24d3 | 1474 | if (!list_empty(&con->writequeue)) |
063c4c99 | 1475 | send_to_sock(con); |
fdda387f PC |
1476 | } |
1477 | ||
1478 | ||
1479 | /* Discard all entries on the write queues */ | |
1480 | static void clean_writequeues(void) | |
1481 | { | |
5e9ccc37 | 1482 | foreach_conn(clean_one_writequeue); |
fdda387f PC |
1483 | } |
1484 | ||
1d6e8131 | 1485 | static void work_stop(void) |
fdda387f | 1486 | { |
b355516f DW |
1487 | if (recv_workqueue) |
1488 | destroy_workqueue(recv_workqueue); | |
1489 | if (send_workqueue) | |
1490 | destroy_workqueue(send_workqueue); | |
fdda387f PC |
1491 | } |
1492 | ||
1d6e8131 | 1493 | static int work_start(void) |
fdda387f | 1494 | { |
e43f055a DT |
1495 | recv_workqueue = alloc_workqueue("dlm_recv", |
1496 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1497 | if (!recv_workqueue) { |
1498 | log_print("can't start dlm_recv"); | |
1499 | return -ENOMEM; | |
fdda387f | 1500 | } |
fdda387f | 1501 | |
e43f055a DT |
1502 | send_workqueue = alloc_workqueue("dlm_send", |
1503 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1504 | if (!send_workqueue) { |
1505 | log_print("can't start dlm_send"); | |
1d6e8131 | 1506 | destroy_workqueue(recv_workqueue); |
b9d41052 | 1507 | return -ENOMEM; |
fdda387f | 1508 | } |
fdda387f PC |
1509 | |
1510 | return 0; | |
1511 | } | |
1512 | ||
f0fb83cb | 1513 | static void _stop_conn(struct connection *con, bool and_other) |
fdda387f | 1514 | { |
f0fb83cb | 1515 | mutex_lock(&con->sock_mutex); |
173a31fe | 1516 | set_bit(CF_CLOSE, &con->flags); |
f0fb83cb | 1517 | set_bit(CF_READ_PENDING, &con->flags); |
8a4abb08 | 1518 | set_bit(CF_WRITE_PENDING, &con->flags); |
93eaadeb | 1519 | if (con->sock && con->sock->sk) { |
1520 | write_lock_bh(&con->sock->sk->sk_callback_lock); | |
5e9ccc37 | 1521 | con->sock->sk->sk_user_data = NULL; |
93eaadeb | 1522 | write_unlock_bh(&con->sock->sk->sk_callback_lock); |
1523 | } | |
f0fb83cb | 1524 | if (con->othercon && and_other) |
1525 | _stop_conn(con->othercon, false); | |
1526 | mutex_unlock(&con->sock_mutex); | |
1527 | } | |
1528 | ||
1529 | static void stop_conn(struct connection *con) | |
1530 | { | |
1531 | _stop_conn(con, true); | |
5e9ccc37 | 1532 | } |
fdda387f | 1533 | |
5e9ccc37 CC |
1534 | static void free_conn(struct connection *con) |
1535 | { | |
0d737a8c | 1536 | close_connection(con, true, true, true); |
5e9ccc37 CC |
1537 | if (con->othercon) |
1538 | kmem_cache_free(con_cache, con->othercon); | |
1539 | hlist_del(&con->list); | |
1540 | kmem_cache_free(con_cache, con); | |
1541 | } | |
1542 | ||
f0fb83cb | 1543 | static void work_flush(void) |
1544 | { | |
1545 | int ok; | |
1546 | int i; | |
1547 | struct hlist_node *n; | |
1548 | struct connection *con; | |
1549 | ||
b355516f DW |
1550 | if (recv_workqueue) |
1551 | flush_workqueue(recv_workqueue); | |
1552 | if (send_workqueue) | |
1553 | flush_workqueue(send_workqueue); | |
f0fb83cb | 1554 | do { |
1555 | ok = 1; | |
1556 | foreach_conn(stop_conn); | |
b355516f DW |
1557 | if (recv_workqueue) |
1558 | flush_workqueue(recv_workqueue); | |
1559 | if (send_workqueue) | |
1560 | flush_workqueue(send_workqueue); | |
f0fb83cb | 1561 | for (i = 0; i < CONN_HASH_SIZE && ok; i++) { |
1562 | hlist_for_each_entry_safe(con, n, | |
1563 | &connection_hash[i], list) { | |
1564 | ok &= test_bit(CF_READ_PENDING, &con->flags); | |
8a4abb08 | 1565 | ok &= test_bit(CF_WRITE_PENDING, &con->flags); |
1566 | if (con->othercon) { | |
f0fb83cb | 1567 | ok &= test_bit(CF_READ_PENDING, |
1568 | &con->othercon->flags); | |
8a4abb08 | 1569 | ok &= test_bit(CF_WRITE_PENDING, |
1570 | &con->othercon->flags); | |
1571 | } | |
f0fb83cb | 1572 | } |
1573 | } | |
1574 | } while (!ok); | |
1575 | } | |
1576 | ||
5e9ccc37 CC |
1577 | void dlm_lowcomms_stop(void) |
1578 | { | |
ac33d071 | 1579 | /* Set all the flags to prevent any |
fdda387f PC |
1580 | socket activity. |
1581 | */ | |
7a936ce7 | 1582 | mutex_lock(&connections_lock); |
513ef596 | 1583 | dlm_allow_conn = 0; |
f0fb83cb | 1584 | mutex_unlock(&connections_lock); |
1585 | work_flush(); | |
3a8db798 MRL |
1586 | clean_writequeues(); |
1587 | foreach_conn(free_conn); | |
1d6e8131 | 1588 | work_stop(); |
6ed7257b | 1589 | |
fdda387f PC |
1590 | kmem_cache_destroy(con_cache); |
1591 | } | |
1592 | ||
fdda387f PC |
1593 | int dlm_lowcomms_start(void) |
1594 | { | |
6ed7257b PC |
1595 | int error = -EINVAL; |
1596 | struct connection *con; | |
5e9ccc37 CC |
1597 | int i; |
1598 | ||
1599 | for (i = 0; i < CONN_HASH_SIZE; i++) | |
1600 | INIT_HLIST_HEAD(&connection_hash[i]); | |
fdda387f | 1601 | |
6ed7257b PC |
1602 | init_local(); |
1603 | if (!dlm_local_count) { | |
617e82e1 | 1604 | error = -ENOTCONN; |
fdda387f | 1605 | log_print("no local IP address has been set"); |
513ef596 | 1606 | goto fail; |
fdda387f PC |
1607 | } |
1608 | ||
6ed7257b | 1609 | error = -ENOMEM; |
fdda387f | 1610 | con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
ac33d071 | 1611 | __alignof__(struct connection), 0, |
20c2df83 | 1612 | NULL); |
fdda387f | 1613 | if (!con_cache) |
513ef596 DT |
1614 | goto fail; |
1615 | ||
1616 | error = work_start(); | |
1617 | if (error) | |
1618 | goto fail_destroy; | |
1619 | ||
1620 | dlm_allow_conn = 1; | |
fdda387f | 1621 | |
fdda387f | 1622 | /* Start listening */ |
6ed7257b PC |
1623 | if (dlm_config.ci_protocol == 0) |
1624 | error = tcp_listen_for_all(); | |
1625 | else | |
1626 | error = sctp_listen_for_all(); | |
fdda387f PC |
1627 | if (error) |
1628 | goto fail_unlisten; | |
1629 | ||
fdda387f PC |
1630 | return 0; |
1631 | ||
ac33d071 | 1632 | fail_unlisten: |
513ef596 | 1633 | dlm_allow_conn = 0; |
6ed7257b PC |
1634 | con = nodeid2con(0,0); |
1635 | if (con) { | |
0d737a8c | 1636 | close_connection(con, false, true, true); |
6ed7257b PC |
1637 | kmem_cache_free(con_cache, con); |
1638 | } | |
513ef596 | 1639 | fail_destroy: |
fdda387f | 1640 | kmem_cache_destroy(con_cache); |
513ef596 | 1641 | fail: |
fdda387f PC |
1642 | return error; |
1643 | } | |
36b71a8b DT |
1644 | |
1645 | void dlm_lowcomms_exit(void) | |
1646 | { | |
1647 | struct dlm_node_addr *na, *safe; | |
1648 | ||
1649 | spin_lock(&dlm_node_addrs_spin); | |
1650 | list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { | |
1651 | list_del(&na->list); | |
1652 | while (na->addr_count--) | |
1653 | kfree(na->addr[na->addr_count]); | |
1654 | kfree(na); | |
1655 | } | |
1656 | spin_unlock(&dlm_node_addrs_spin); | |
1657 | } |