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fdda387f PC |
1 | /****************************************************************************** |
2 | ******************************************************************************* | |
3 | ** | |
4 | ** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
5e9ccc37 | 5 | ** Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved. |
fdda387f PC |
6 | ** |
7 | ** This copyrighted material is made available to anyone wishing to use, | |
8 | ** modify, copy, or redistribute it subject to the terms and conditions | |
9 | ** of the GNU General Public License v.2. | |
10 | ** | |
11 | ******************************************************************************* | |
12 | ******************************************************************************/ | |
13 | ||
14 | /* | |
15 | * lowcomms.c | |
16 | * | |
17 | * This is the "low-level" comms layer. | |
18 | * | |
19 | * It is responsible for sending/receiving messages | |
20 | * from other nodes in the cluster. | |
21 | * | |
22 | * Cluster nodes are referred to by their nodeids. nodeids are | |
23 | * simply 32 bit numbers to the locking module - if they need to | |
2cf12c0b | 24 | * be expanded for the cluster infrastructure then that is its |
fdda387f PC |
25 | * responsibility. It is this layer's |
26 | * responsibility to resolve these into IP address or | |
27 | * whatever it needs for inter-node communication. | |
28 | * | |
29 | * The comms level is two kernel threads that deal mainly with | |
30 | * the receiving of messages from other nodes and passing them | |
31 | * up to the mid-level comms layer (which understands the | |
32 | * message format) for execution by the locking core, and | |
33 | * a send thread which does all the setting up of connections | |
34 | * to remote nodes and the sending of data. Threads are not allowed | |
35 | * to send their own data because it may cause them to wait in times | |
36 | * of high load. Also, this way, the sending thread can collect together | |
37 | * messages bound for one node and send them in one block. | |
38 | * | |
2cf12c0b | 39 | * lowcomms will choose to use either TCP or SCTP as its transport layer |
6ed7257b | 40 | * depending on the configuration variable 'protocol'. This should be set |
2cf12c0b | 41 | * to 0 (default) for TCP or 1 for SCTP. It should be configured using a |
6ed7257b PC |
42 | * cluster-wide mechanism as it must be the same on all nodes of the cluster |
43 | * for the DLM to function. | |
fdda387f PC |
44 | * |
45 | */ | |
46 | ||
fdda387f PC |
47 | #include <asm/ioctls.h> |
48 | #include <net/sock.h> | |
49 | #include <net/tcp.h> | |
50 | #include <linux/pagemap.h> | |
6ed7257b | 51 | #include <linux/file.h> |
7a936ce7 | 52 | #include <linux/mutex.h> |
6ed7257b | 53 | #include <linux/sctp.h> |
5a0e3ad6 | 54 | #include <linux/slab.h> |
2f2d76cc | 55 | #include <net/sctp/sctp.h> |
44ad532b | 56 | #include <net/ipv6.h> |
fdda387f PC |
57 | |
58 | #include "dlm_internal.h" | |
59 | #include "lowcomms.h" | |
60 | #include "midcomms.h" | |
61 | #include "config.h" | |
62 | ||
6ed7257b | 63 | #define NEEDED_RMEM (4*1024*1024) |
5e9ccc37 | 64 | #define CONN_HASH_SIZE 32 |
6ed7257b | 65 | |
f92c8dd7 BP |
66 | /* Number of messages to send before rescheduling */ |
67 | #define MAX_SEND_MSG_COUNT 25 | |
68 | ||
fdda387f | 69 | struct cbuf { |
ac33d071 PC |
70 | unsigned int base; |
71 | unsigned int len; | |
72 | unsigned int mask; | |
fdda387f PC |
73 | }; |
74 | ||
ac33d071 PC |
75 | static void cbuf_add(struct cbuf *cb, int n) |
76 | { | |
77 | cb->len += n; | |
78 | } | |
fdda387f | 79 | |
ac33d071 PC |
80 | static int cbuf_data(struct cbuf *cb) |
81 | { | |
82 | return ((cb->base + cb->len) & cb->mask); | |
83 | } | |
84 | ||
85 | static void cbuf_init(struct cbuf *cb, int size) | |
86 | { | |
87 | cb->base = cb->len = 0; | |
88 | cb->mask = size-1; | |
89 | } | |
90 | ||
91 | static void cbuf_eat(struct cbuf *cb, int n) | |
92 | { | |
93 | cb->len -= n; | |
94 | cb->base += n; | |
95 | cb->base &= cb->mask; | |
96 | } | |
97 | ||
98 | static bool cbuf_empty(struct cbuf *cb) | |
99 | { | |
100 | return cb->len == 0; | |
101 | } | |
fdda387f | 102 | |
fdda387f PC |
103 | struct connection { |
104 | struct socket *sock; /* NULL if not connected */ | |
105 | uint32_t nodeid; /* So we know who we are in the list */ | |
f1f1c1cc | 106 | struct mutex sock_mutex; |
6ed7257b | 107 | unsigned long flags; |
fdda387f | 108 | #define CF_READ_PENDING 1 |
8a4abb08 | 109 | #define CF_WRITE_PENDING 2 |
6ed7257b PC |
110 | #define CF_INIT_PENDING 4 |
111 | #define CF_IS_OTHERCON 5 | |
063c4c99 | 112 | #define CF_CLOSE 6 |
b36930dd | 113 | #define CF_APP_LIMITED 7 |
b2a66629 | 114 | #define CF_CLOSING 8 |
ac33d071 | 115 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
fdda387f PC |
116 | spinlock_t writequeue_lock; |
117 | int (*rx_action) (struct connection *); /* What to do when active */ | |
6ed7257b | 118 | void (*connect_action) (struct connection *); /* What to do to connect */ |
fdda387f PC |
119 | struct page *rx_page; |
120 | struct cbuf cb; | |
121 | int retries; | |
fdda387f | 122 | #define MAX_CONNECT_RETRIES 3 |
5e9ccc37 | 123 | struct hlist_node list; |
fdda387f | 124 | struct connection *othercon; |
1d6e8131 PC |
125 | struct work_struct rwork; /* Receive workqueue */ |
126 | struct work_struct swork; /* Send workqueue */ | |
fdda387f PC |
127 | }; |
128 | #define sock2con(x) ((struct connection *)(x)->sk_user_data) | |
129 | ||
130 | /* An entry waiting to be sent */ | |
131 | struct writequeue_entry { | |
132 | struct list_head list; | |
133 | struct page *page; | |
134 | int offset; | |
135 | int len; | |
136 | int end; | |
137 | int users; | |
138 | struct connection *con; | |
139 | }; | |
140 | ||
36b71a8b DT |
141 | struct dlm_node_addr { |
142 | struct list_head list; | |
143 | int nodeid; | |
144 | int addr_count; | |
98e1b60e | 145 | int curr_addr_index; |
36b71a8b DT |
146 | struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT]; |
147 | }; | |
148 | ||
cc661fc9 BP |
149 | static struct listen_sock_callbacks { |
150 | void (*sk_error_report)(struct sock *); | |
151 | void (*sk_data_ready)(struct sock *); | |
152 | void (*sk_state_change)(struct sock *); | |
153 | void (*sk_write_space)(struct sock *); | |
154 | } listen_sock; | |
155 | ||
36b71a8b DT |
156 | static LIST_HEAD(dlm_node_addrs); |
157 | static DEFINE_SPINLOCK(dlm_node_addrs_spin); | |
158 | ||
6ed7257b PC |
159 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
160 | static int dlm_local_count; | |
513ef596 | 161 | static int dlm_allow_conn; |
fdda387f | 162 | |
1d6e8131 PC |
163 | /* Work queues */ |
164 | static struct workqueue_struct *recv_workqueue; | |
165 | static struct workqueue_struct *send_workqueue; | |
fdda387f | 166 | |
5e9ccc37 | 167 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
7a936ce7 | 168 | static DEFINE_MUTEX(connections_lock); |
c80e7c83 | 169 | static struct kmem_cache *con_cache; |
fdda387f | 170 | |
1d6e8131 PC |
171 | static void process_recv_sockets(struct work_struct *work); |
172 | static void process_send_sockets(struct work_struct *work); | |
fdda387f | 173 | |
5e9ccc37 CC |
174 | |
175 | /* This is deliberately very simple because most clusters have simple | |
176 | sequential nodeids, so we should be able to go straight to a connection | |
177 | struct in the array */ | |
178 | static inline int nodeid_hash(int nodeid) | |
179 | { | |
180 | return nodeid & (CONN_HASH_SIZE-1); | |
181 | } | |
182 | ||
183 | static struct connection *__find_con(int nodeid) | |
184 | { | |
185 | int r; | |
5e9ccc37 CC |
186 | struct connection *con; |
187 | ||
188 | r = nodeid_hash(nodeid); | |
189 | ||
b67bfe0d | 190 | hlist_for_each_entry(con, &connection_hash[r], list) { |
5e9ccc37 CC |
191 | if (con->nodeid == nodeid) |
192 | return con; | |
193 | } | |
194 | return NULL; | |
195 | } | |
196 | ||
6ed7257b PC |
197 | /* |
198 | * If 'allocation' is zero then we don't attempt to create a new | |
199 | * connection structure for this node. | |
200 | */ | |
201 | static struct connection *__nodeid2con(int nodeid, gfp_t alloc) | |
fdda387f PC |
202 | { |
203 | struct connection *con = NULL; | |
6ed7257b | 204 | int r; |
fdda387f | 205 | |
5e9ccc37 | 206 | con = __find_con(nodeid); |
6ed7257b PC |
207 | if (con || !alloc) |
208 | return con; | |
fdda387f | 209 | |
6ed7257b PC |
210 | con = kmem_cache_zalloc(con_cache, alloc); |
211 | if (!con) | |
212 | return NULL; | |
fdda387f | 213 | |
5e9ccc37 CC |
214 | r = nodeid_hash(nodeid); |
215 | hlist_add_head(&con->list, &connection_hash[r]); | |
fdda387f | 216 | |
6ed7257b PC |
217 | con->nodeid = nodeid; |
218 | mutex_init(&con->sock_mutex); | |
219 | INIT_LIST_HEAD(&con->writequeue); | |
220 | spin_lock_init(&con->writequeue_lock); | |
221 | INIT_WORK(&con->swork, process_send_sockets); | |
222 | INIT_WORK(&con->rwork, process_recv_sockets); | |
fdda387f | 223 | |
6ed7257b PC |
224 | /* Setup action pointers for child sockets */ |
225 | if (con->nodeid) { | |
5e9ccc37 | 226 | struct connection *zerocon = __find_con(0); |
fdda387f | 227 | |
6ed7257b PC |
228 | con->connect_action = zerocon->connect_action; |
229 | if (!con->rx_action) | |
230 | con->rx_action = zerocon->rx_action; | |
fdda387f PC |
231 | } |
232 | ||
6ed7257b PC |
233 | return con; |
234 | } | |
235 | ||
5e9ccc37 CC |
236 | /* Loop round all connections */ |
237 | static void foreach_conn(void (*conn_func)(struct connection *c)) | |
238 | { | |
239 | int i; | |
b67bfe0d | 240 | struct hlist_node *n; |
5e9ccc37 CC |
241 | struct connection *con; |
242 | ||
243 | for (i = 0; i < CONN_HASH_SIZE; i++) { | |
b67bfe0d | 244 | hlist_for_each_entry_safe(con, n, &connection_hash[i], list) |
5e9ccc37 | 245 | conn_func(con); |
5e9ccc37 CC |
246 | } |
247 | } | |
248 | ||
6ed7257b PC |
249 | static struct connection *nodeid2con(int nodeid, gfp_t allocation) |
250 | { | |
251 | struct connection *con; | |
252 | ||
7a936ce7 | 253 | mutex_lock(&connections_lock); |
6ed7257b | 254 | con = __nodeid2con(nodeid, allocation); |
7a936ce7 | 255 | mutex_unlock(&connections_lock); |
6ed7257b | 256 | |
fdda387f PC |
257 | return con; |
258 | } | |
259 | ||
36b71a8b DT |
260 | static struct dlm_node_addr *find_node_addr(int nodeid) |
261 | { | |
262 | struct dlm_node_addr *na; | |
263 | ||
264 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
265 | if (na->nodeid == nodeid) | |
266 | return na; | |
267 | } | |
268 | return NULL; | |
269 | } | |
270 | ||
271 | static int addr_compare(struct sockaddr_storage *x, struct sockaddr_storage *y) | |
6ed7257b | 272 | { |
36b71a8b DT |
273 | switch (x->ss_family) { |
274 | case AF_INET: { | |
275 | struct sockaddr_in *sinx = (struct sockaddr_in *)x; | |
276 | struct sockaddr_in *siny = (struct sockaddr_in *)y; | |
277 | if (sinx->sin_addr.s_addr != siny->sin_addr.s_addr) | |
278 | return 0; | |
279 | if (sinx->sin_port != siny->sin_port) | |
280 | return 0; | |
281 | break; | |
282 | } | |
283 | case AF_INET6: { | |
284 | struct sockaddr_in6 *sinx = (struct sockaddr_in6 *)x; | |
285 | struct sockaddr_in6 *siny = (struct sockaddr_in6 *)y; | |
286 | if (!ipv6_addr_equal(&sinx->sin6_addr, &siny->sin6_addr)) | |
287 | return 0; | |
288 | if (sinx->sin6_port != siny->sin6_port) | |
289 | return 0; | |
290 | break; | |
291 | } | |
292 | default: | |
293 | return 0; | |
294 | } | |
295 | return 1; | |
296 | } | |
297 | ||
298 | static int nodeid_to_addr(int nodeid, struct sockaddr_storage *sas_out, | |
98e1b60e | 299 | struct sockaddr *sa_out, bool try_new_addr) |
36b71a8b DT |
300 | { |
301 | struct sockaddr_storage sas; | |
302 | struct dlm_node_addr *na; | |
6ed7257b PC |
303 | |
304 | if (!dlm_local_count) | |
305 | return -1; | |
306 | ||
36b71a8b DT |
307 | spin_lock(&dlm_node_addrs_spin); |
308 | na = find_node_addr(nodeid); | |
98e1b60e | 309 | if (na && na->addr_count) { |
ee44b4bc MRL |
310 | memcpy(&sas, na->addr[na->curr_addr_index], |
311 | sizeof(struct sockaddr_storage)); | |
312 | ||
98e1b60e MC |
313 | if (try_new_addr) { |
314 | na->curr_addr_index++; | |
315 | if (na->curr_addr_index == na->addr_count) | |
316 | na->curr_addr_index = 0; | |
317 | } | |
98e1b60e | 318 | } |
36b71a8b DT |
319 | spin_unlock(&dlm_node_addrs_spin); |
320 | ||
321 | if (!na) | |
322 | return -EEXIST; | |
323 | ||
324 | if (!na->addr_count) | |
325 | return -ENOENT; | |
326 | ||
327 | if (sas_out) | |
328 | memcpy(sas_out, &sas, sizeof(struct sockaddr_storage)); | |
329 | ||
330 | if (!sa_out) | |
331 | return 0; | |
6ed7257b PC |
332 | |
333 | if (dlm_local_addr[0]->ss_family == AF_INET) { | |
36b71a8b DT |
334 | struct sockaddr_in *in4 = (struct sockaddr_in *) &sas; |
335 | struct sockaddr_in *ret4 = (struct sockaddr_in *) sa_out; | |
6ed7257b PC |
336 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; |
337 | } else { | |
36b71a8b DT |
338 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &sas; |
339 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) sa_out; | |
4e3fd7a0 | 340 | ret6->sin6_addr = in6->sin6_addr; |
6ed7257b PC |
341 | } |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
36b71a8b DT |
346 | static int addr_to_nodeid(struct sockaddr_storage *addr, int *nodeid) |
347 | { | |
348 | struct dlm_node_addr *na; | |
349 | int rv = -EEXIST; | |
98e1b60e | 350 | int addr_i; |
36b71a8b DT |
351 | |
352 | spin_lock(&dlm_node_addrs_spin); | |
353 | list_for_each_entry(na, &dlm_node_addrs, list) { | |
354 | if (!na->addr_count) | |
355 | continue; | |
356 | ||
98e1b60e MC |
357 | for (addr_i = 0; addr_i < na->addr_count; addr_i++) { |
358 | if (addr_compare(na->addr[addr_i], addr)) { | |
359 | *nodeid = na->nodeid; | |
360 | rv = 0; | |
361 | goto unlock; | |
362 | } | |
363 | } | |
36b71a8b | 364 | } |
98e1b60e | 365 | unlock: |
36b71a8b DT |
366 | spin_unlock(&dlm_node_addrs_spin); |
367 | return rv; | |
368 | } | |
369 | ||
370 | int dlm_lowcomms_addr(int nodeid, struct sockaddr_storage *addr, int len) | |
371 | { | |
372 | struct sockaddr_storage *new_addr; | |
373 | struct dlm_node_addr *new_node, *na; | |
374 | ||
375 | new_node = kzalloc(sizeof(struct dlm_node_addr), GFP_NOFS); | |
376 | if (!new_node) | |
377 | return -ENOMEM; | |
378 | ||
379 | new_addr = kzalloc(sizeof(struct sockaddr_storage), GFP_NOFS); | |
380 | if (!new_addr) { | |
381 | kfree(new_node); | |
382 | return -ENOMEM; | |
383 | } | |
384 | ||
385 | memcpy(new_addr, addr, len); | |
386 | ||
387 | spin_lock(&dlm_node_addrs_spin); | |
388 | na = find_node_addr(nodeid); | |
389 | if (!na) { | |
390 | new_node->nodeid = nodeid; | |
391 | new_node->addr[0] = new_addr; | |
392 | new_node->addr_count = 1; | |
393 | list_add(&new_node->list, &dlm_node_addrs); | |
394 | spin_unlock(&dlm_node_addrs_spin); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | if (na->addr_count >= DLM_MAX_ADDR_COUNT) { | |
399 | spin_unlock(&dlm_node_addrs_spin); | |
400 | kfree(new_addr); | |
401 | kfree(new_node); | |
402 | return -ENOSPC; | |
403 | } | |
404 | ||
405 | na->addr[na->addr_count++] = new_addr; | |
406 | spin_unlock(&dlm_node_addrs_spin); | |
407 | kfree(new_node); | |
408 | return 0; | |
409 | } | |
410 | ||
fdda387f | 411 | /* Data available on socket or listen socket received a connect */ |
676d2369 | 412 | static void lowcomms_data_ready(struct sock *sk) |
fdda387f | 413 | { |
93eaadeb | 414 | struct connection *con; |
415 | ||
416 | read_lock_bh(&sk->sk_callback_lock); | |
417 | con = sock2con(sk); | |
afb853fb | 418 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
1d6e8131 | 419 | queue_work(recv_workqueue, &con->rwork); |
93eaadeb | 420 | read_unlock_bh(&sk->sk_callback_lock); |
fdda387f PC |
421 | } |
422 | ||
423 | static void lowcomms_write_space(struct sock *sk) | |
424 | { | |
93eaadeb | 425 | struct connection *con; |
fdda387f | 426 | |
93eaadeb | 427 | read_lock_bh(&sk->sk_callback_lock); |
428 | con = sock2con(sk); | |
b36930dd | 429 | if (!con) |
93eaadeb | 430 | goto out; |
b36930dd DM |
431 | |
432 | clear_bit(SOCK_NOSPACE, &con->sock->flags); | |
433 | ||
434 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { | |
435 | con->sock->sk->sk_write_pending--; | |
9cd3e072 | 436 | clear_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags); |
b36930dd DM |
437 | } |
438 | ||
01da24d3 | 439 | queue_work(send_workqueue, &con->swork); |
93eaadeb | 440 | out: |
441 | read_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
442 | } |
443 | ||
444 | static inline void lowcomms_connect_sock(struct connection *con) | |
445 | { | |
063c4c99 LMB |
446 | if (test_bit(CF_CLOSE, &con->flags)) |
447 | return; | |
61d9102b BP |
448 | queue_work(send_workqueue, &con->swork); |
449 | cond_resched(); | |
fdda387f PC |
450 | } |
451 | ||
452 | static void lowcomms_state_change(struct sock *sk) | |
453 | { | |
ee44b4bc MRL |
454 | /* SCTP layer is not calling sk_data_ready when the connection |
455 | * is done, so we catch the signal through here. Also, it | |
456 | * doesn't switch socket state when entering shutdown, so we | |
457 | * skip the write in that case. | |
458 | */ | |
459 | if (sk->sk_shutdown) { | |
460 | if (sk->sk_shutdown == RCV_SHUTDOWN) | |
461 | lowcomms_data_ready(sk); | |
462 | } else if (sk->sk_state == TCP_ESTABLISHED) { | |
fdda387f | 463 | lowcomms_write_space(sk); |
ee44b4bc | 464 | } |
fdda387f PC |
465 | } |
466 | ||
391fbdc5 CC |
467 | int dlm_lowcomms_connect_node(int nodeid) |
468 | { | |
469 | struct connection *con; | |
470 | ||
471 | if (nodeid == dlm_our_nodeid()) | |
472 | return 0; | |
473 | ||
474 | con = nodeid2con(nodeid, GFP_NOFS); | |
475 | if (!con) | |
476 | return -ENOMEM; | |
477 | lowcomms_connect_sock(con); | |
478 | return 0; | |
479 | } | |
480 | ||
b3a5bbfd BP |
481 | static void lowcomms_error_report(struct sock *sk) |
482 | { | |
b81171cb | 483 | struct connection *con; |
b3a5bbfd | 484 | struct sockaddr_storage saddr; |
b81171cb | 485 | void (*orig_report)(struct sock *) = NULL; |
b3a5bbfd | 486 | |
b81171cb BP |
487 | read_lock_bh(&sk->sk_callback_lock); |
488 | con = sock2con(sk); | |
489 | if (con == NULL) | |
490 | goto out; | |
491 | ||
cc661fc9 | 492 | orig_report = listen_sock.sk_error_report; |
1a31833d | 493 | if (con->sock == NULL || |
9b2c45d4 | 494 | kernel_getpeername(con->sock, (struct sockaddr *)&saddr) < 0) { |
b3a5bbfd BP |
495 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " |
496 | "sending to node %d, port %d, " | |
497 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
498 | con->nodeid, dlm_config.ci_tcp_port, | |
499 | sk->sk_err, sk->sk_err_soft); | |
b3a5bbfd BP |
500 | } else if (saddr.ss_family == AF_INET) { |
501 | struct sockaddr_in *sin4 = (struct sockaddr_in *)&saddr; | |
502 | ||
503 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
504 | "sending to node %d at %pI4, port %d, " | |
505 | "sk_err=%d/%d\n", dlm_our_nodeid(), | |
506 | con->nodeid, &sin4->sin_addr.s_addr, | |
507 | dlm_config.ci_tcp_port, sk->sk_err, | |
508 | sk->sk_err_soft); | |
509 | } else { | |
510 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&saddr; | |
511 | ||
512 | printk_ratelimited(KERN_ERR "dlm: node %d: socket error " | |
513 | "sending to node %d at %u.%u.%u.%u, " | |
514 | "port %d, sk_err=%d/%d\n", dlm_our_nodeid(), | |
515 | con->nodeid, sin6->sin6_addr.s6_addr32[0], | |
516 | sin6->sin6_addr.s6_addr32[1], | |
517 | sin6->sin6_addr.s6_addr32[2], | |
518 | sin6->sin6_addr.s6_addr32[3], | |
519 | dlm_config.ci_tcp_port, sk->sk_err, | |
520 | sk->sk_err_soft); | |
521 | } | |
b81171cb BP |
522 | out: |
523 | read_unlock_bh(&sk->sk_callback_lock); | |
524 | if (orig_report) | |
525 | orig_report(sk); | |
526 | } | |
527 | ||
528 | /* Note: sk_callback_lock must be locked before calling this function. */ | |
cc661fc9 | 529 | static void save_listen_callbacks(struct socket *sock) |
b81171cb | 530 | { |
cc661fc9 BP |
531 | struct sock *sk = sock->sk; |
532 | ||
533 | listen_sock.sk_data_ready = sk->sk_data_ready; | |
534 | listen_sock.sk_state_change = sk->sk_state_change; | |
535 | listen_sock.sk_write_space = sk->sk_write_space; | |
536 | listen_sock.sk_error_report = sk->sk_error_report; | |
b81171cb BP |
537 | } |
538 | ||
cc661fc9 | 539 | static void restore_callbacks(struct socket *sock) |
b81171cb | 540 | { |
cc661fc9 BP |
541 | struct sock *sk = sock->sk; |
542 | ||
b81171cb | 543 | write_lock_bh(&sk->sk_callback_lock); |
b81171cb | 544 | sk->sk_user_data = NULL; |
cc661fc9 BP |
545 | sk->sk_data_ready = listen_sock.sk_data_ready; |
546 | sk->sk_state_change = listen_sock.sk_state_change; | |
547 | sk->sk_write_space = listen_sock.sk_write_space; | |
548 | sk->sk_error_report = listen_sock.sk_error_report; | |
b81171cb | 549 | write_unlock_bh(&sk->sk_callback_lock); |
b3a5bbfd BP |
550 | } |
551 | ||
fdda387f | 552 | /* Make a socket active */ |
988419a9 | 553 | static void add_sock(struct socket *sock, struct connection *con) |
fdda387f | 554 | { |
b81171cb BP |
555 | struct sock *sk = sock->sk; |
556 | ||
557 | write_lock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
558 | con->sock = sock; |
559 | ||
b81171cb | 560 | sk->sk_user_data = con; |
fdda387f | 561 | /* Install a data_ready callback */ |
b81171cb BP |
562 | sk->sk_data_ready = lowcomms_data_ready; |
563 | sk->sk_write_space = lowcomms_write_space; | |
564 | sk->sk_state_change = lowcomms_state_change; | |
565 | sk->sk_allocation = GFP_NOFS; | |
566 | sk->sk_error_report = lowcomms_error_report; | |
567 | write_unlock_bh(&sk->sk_callback_lock); | |
fdda387f PC |
568 | } |
569 | ||
6ed7257b | 570 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
fdda387f PC |
571 | length */ |
572 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, | |
573 | int *addr_len) | |
574 | { | |
6ed7257b | 575 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
ac33d071 | 576 | if (saddr->ss_family == AF_INET) { |
fdda387f PC |
577 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
578 | in4_addr->sin_port = cpu_to_be16(port); | |
579 | *addr_len = sizeof(struct sockaddr_in); | |
6ed7257b | 580 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
ac33d071 | 581 | } else { |
fdda387f PC |
582 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
583 | in6_addr->sin6_port = cpu_to_be16(port); | |
584 | *addr_len = sizeof(struct sockaddr_in6); | |
585 | } | |
01c8cab2 | 586 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
fdda387f PC |
587 | } |
588 | ||
589 | /* Close a remote connection and tidy up */ | |
0d737a8c MRL |
590 | static void close_connection(struct connection *con, bool and_other, |
591 | bool tx, bool rx) | |
fdda387f | 592 | { |
b2a66629 | 593 | bool closing = test_and_set_bit(CF_CLOSING, &con->flags); |
594 | ||
0aa18464 | 595 | if (tx && !closing && cancel_work_sync(&con->swork)) { |
0d737a8c | 596 | log_print("canceled swork for node %d", con->nodeid); |
0aa18464 | 597 | clear_bit(CF_WRITE_PENDING, &con->flags); |
598 | } | |
599 | if (rx && !closing && cancel_work_sync(&con->rwork)) { | |
0d737a8c | 600 | log_print("canceled rwork for node %d", con->nodeid); |
0aa18464 | 601 | clear_bit(CF_READ_PENDING, &con->flags); |
602 | } | |
fdda387f | 603 | |
0d737a8c | 604 | mutex_lock(&con->sock_mutex); |
fdda387f | 605 | if (con->sock) { |
cc661fc9 | 606 | restore_callbacks(con->sock); |
fdda387f PC |
607 | sock_release(con->sock); |
608 | con->sock = NULL; | |
609 | } | |
610 | if (con->othercon && and_other) { | |
ac33d071 | 611 | /* Will only re-enter once. */ |
0d737a8c | 612 | close_connection(con->othercon, false, true, true); |
fdda387f PC |
613 | } |
614 | if (con->rx_page) { | |
615 | __free_page(con->rx_page); | |
616 | con->rx_page = NULL; | |
617 | } | |
9e5f2825 | 618 | |
61d96be0 PC |
619 | con->retries = 0; |
620 | mutex_unlock(&con->sock_mutex); | |
b2a66629 | 621 | clear_bit(CF_CLOSING, &con->flags); |
fdda387f PC |
622 | } |
623 | ||
624 | /* Data received from remote end */ | |
625 | static int receive_from_sock(struct connection *con) | |
626 | { | |
627 | int ret = 0; | |
58addbff AV |
628 | struct msghdr msg = {}; |
629 | struct kvec iov[2]; | |
fdda387f PC |
630 | unsigned len; |
631 | int r; | |
632 | int call_again_soon = 0; | |
58addbff | 633 | int nvec; |
fdda387f | 634 | |
f1f1c1cc | 635 | mutex_lock(&con->sock_mutex); |
fdda387f | 636 | |
a34fbc63 PC |
637 | if (con->sock == NULL) { |
638 | ret = -EAGAIN; | |
639 | goto out_close; | |
640 | } | |
acee4e52 MRL |
641 | if (con->nodeid == 0) { |
642 | ret = -EINVAL; | |
643 | goto out_close; | |
644 | } | |
a34fbc63 | 645 | |
fdda387f PC |
646 | if (con->rx_page == NULL) { |
647 | /* | |
648 | * This doesn't need to be atomic, but I think it should | |
649 | * improve performance if it is. | |
650 | */ | |
651 | con->rx_page = alloc_page(GFP_ATOMIC); | |
652 | if (con->rx_page == NULL) | |
653 | goto out_resched; | |
09cbfeaf | 654 | cbuf_init(&con->cb, PAGE_SIZE); |
fdda387f PC |
655 | } |
656 | ||
fdda387f PC |
657 | /* |
658 | * iov[0] is the bit of the circular buffer between the current end | |
659 | * point (cb.base + cb.len) and the end of the buffer. | |
660 | */ | |
ac33d071 PC |
661 | iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); |
662 | iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); | |
89adc934 | 663 | iov[1].iov_len = 0; |
58addbff | 664 | nvec = 1; |
fdda387f PC |
665 | |
666 | /* | |
667 | * iov[1] is the bit of the circular buffer between the start of the | |
668 | * buffer and the start of the currently used section (cb.base) | |
669 | */ | |
ac33d071 | 670 | if (cbuf_data(&con->cb) >= con->cb.base) { |
09cbfeaf | 671 | iov[0].iov_len = PAGE_SIZE - cbuf_data(&con->cb); |
fdda387f PC |
672 | iov[1].iov_len = con->cb.base; |
673 | iov[1].iov_base = page_address(con->rx_page); | |
58addbff | 674 | nvec = 2; |
fdda387f PC |
675 | } |
676 | len = iov[0].iov_len + iov[1].iov_len; | |
aa563d7b | 677 | iov_iter_kvec(&msg.msg_iter, READ, iov, nvec, len); |
fdda387f | 678 | |
c8c7840e | 679 | r = ret = sock_recvmsg(con->sock, &msg, MSG_DONTWAIT | MSG_NOSIGNAL); |
fdda387f PC |
680 | if (ret <= 0) |
681 | goto out_close; | |
ee44b4bc MRL |
682 | else if (ret == len) |
683 | call_again_soon = 1; | |
bd44e2b0 | 684 | |
ac33d071 | 685 | cbuf_add(&con->cb, ret); |
fdda387f PC |
686 | ret = dlm_process_incoming_buffer(con->nodeid, |
687 | page_address(con->rx_page), | |
688 | con->cb.base, con->cb.len, | |
09cbfeaf | 689 | PAGE_SIZE); |
fdda387f | 690 | if (ret == -EBADMSG) { |
ee44b4bc MRL |
691 | log_print("lowcomms: addr=%p, base=%u, len=%u, read=%d", |
692 | page_address(con->rx_page), con->cb.base, | |
693 | con->cb.len, r); | |
fdda387f PC |
694 | } |
695 | if (ret < 0) | |
696 | goto out_close; | |
ac33d071 | 697 | cbuf_eat(&con->cb, ret); |
fdda387f | 698 | |
ac33d071 | 699 | if (cbuf_empty(&con->cb) && !call_again_soon) { |
fdda387f PC |
700 | __free_page(con->rx_page); |
701 | con->rx_page = NULL; | |
702 | } | |
703 | ||
fdda387f PC |
704 | if (call_again_soon) |
705 | goto out_resched; | |
f1f1c1cc | 706 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 707 | return 0; |
fdda387f | 708 | |
ac33d071 | 709 | out_resched: |
1d6e8131 PC |
710 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
711 | queue_work(recv_workqueue, &con->rwork); | |
f1f1c1cc | 712 | mutex_unlock(&con->sock_mutex); |
bd44e2b0 | 713 | return -EAGAIN; |
fdda387f | 714 | |
ac33d071 | 715 | out_close: |
f1f1c1cc | 716 | mutex_unlock(&con->sock_mutex); |
9e5f2825 | 717 | if (ret != -EAGAIN) { |
c553e173 | 718 | close_connection(con, true, true, false); |
fdda387f PC |
719 | /* Reconnect when there is something to send */ |
720 | } | |
a34fbc63 PC |
721 | /* Don't return success if we really got EOF */ |
722 | if (ret == 0) | |
723 | ret = -EAGAIN; | |
fdda387f | 724 | |
fdda387f PC |
725 | return ret; |
726 | } | |
727 | ||
728 | /* Listening socket is busy, accept a connection */ | |
6ed7257b | 729 | static int tcp_accept_from_sock(struct connection *con) |
fdda387f PC |
730 | { |
731 | int result; | |
732 | struct sockaddr_storage peeraddr; | |
733 | struct socket *newsock; | |
734 | int len; | |
735 | int nodeid; | |
736 | struct connection *newcon; | |
bd44e2b0 | 737 | struct connection *addcon; |
fdda387f | 738 | |
513ef596 DT |
739 | mutex_lock(&connections_lock); |
740 | if (!dlm_allow_conn) { | |
741 | mutex_unlock(&connections_lock); | |
742 | return -1; | |
743 | } | |
744 | mutex_unlock(&connections_lock); | |
745 | ||
f1f1c1cc | 746 | mutex_lock_nested(&con->sock_mutex, 0); |
fdda387f | 747 | |
3421fb15 | 748 | if (!con->sock) { |
749 | mutex_unlock(&con->sock_mutex); | |
750 | return -ENOTCONN; | |
751 | } | |
fdda387f | 752 | |
3421fb15 | 753 | result = kernel_accept(con->sock, &newsock, O_NONBLOCK); |
fdda387f PC |
754 | if (result < 0) |
755 | goto accept_err; | |
756 | ||
757 | /* Get the connected socket's peer */ | |
758 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
9b2c45d4 DV |
759 | len = newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, 2); |
760 | if (len < 0) { | |
fdda387f PC |
761 | result = -ECONNABORTED; |
762 | goto accept_err; | |
763 | } | |
764 | ||
765 | /* Get the new node's NODEID */ | |
766 | make_sockaddr(&peeraddr, 0, &len); | |
36b71a8b | 767 | if (addr_to_nodeid(&peeraddr, &nodeid)) { |
bcaadf5c | 768 | unsigned char *b=(unsigned char *)&peeraddr; |
617e82e1 | 769 | log_print("connect from non cluster node"); |
bcaadf5c MY |
770 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, |
771 | b, sizeof(struct sockaddr_storage)); | |
fdda387f | 772 | sock_release(newsock); |
f1f1c1cc | 773 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
774 | return -1; |
775 | } | |
776 | ||
777 | log_print("got connection from %d", nodeid); | |
778 | ||
779 | /* Check to see if we already have a connection to this node. This | |
780 | * could happen if the two nodes initiate a connection at roughly | |
781 | * the same time and the connections cross on the wire. | |
fdda387f PC |
782 | * In this case we store the incoming one in "othercon" |
783 | */ | |
748285cc | 784 | newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f PC |
785 | if (!newcon) { |
786 | result = -ENOMEM; | |
787 | goto accept_err; | |
788 | } | |
f1f1c1cc | 789 | mutex_lock_nested(&newcon->sock_mutex, 1); |
fdda387f | 790 | if (newcon->sock) { |
ac33d071 | 791 | struct connection *othercon = newcon->othercon; |
fdda387f PC |
792 | |
793 | if (!othercon) { | |
748285cc | 794 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
fdda387f | 795 | if (!othercon) { |
617e82e1 | 796 | log_print("failed to allocate incoming socket"); |
f1f1c1cc | 797 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
798 | result = -ENOMEM; |
799 | goto accept_err; | |
800 | } | |
fdda387f PC |
801 | othercon->nodeid = nodeid; |
802 | othercon->rx_action = receive_from_sock; | |
f1f1c1cc | 803 | mutex_init(&othercon->sock_mutex); |
26b41099 | 804 | INIT_LIST_HEAD(&othercon->writequeue); |
805 | spin_lock_init(&othercon->writequeue_lock); | |
1d6e8131 PC |
806 | INIT_WORK(&othercon->swork, process_send_sockets); |
807 | INIT_WORK(&othercon->rwork, process_recv_sockets); | |
fdda387f | 808 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
61d96be0 | 809 | } |
c7355827 | 810 | mutex_lock_nested(&othercon->sock_mutex, 2); |
61d96be0 | 811 | if (!othercon->sock) { |
fdda387f | 812 | newcon->othercon = othercon; |
988419a9 | 813 | add_sock(newsock, othercon); |
97d84836 | 814 | addcon = othercon; |
c7355827 | 815 | mutex_unlock(&othercon->sock_mutex); |
97d84836 PC |
816 | } |
817 | else { | |
818 | printk("Extra connection from node %d attempted\n", nodeid); | |
819 | result = -EAGAIN; | |
c7355827 | 820 | mutex_unlock(&othercon->sock_mutex); |
f4fadb23 | 821 | mutex_unlock(&newcon->sock_mutex); |
97d84836 | 822 | goto accept_err; |
fdda387f | 823 | } |
fdda387f PC |
824 | } |
825 | else { | |
fdda387f | 826 | newcon->rx_action = receive_from_sock; |
3735b4b9 BP |
827 | /* accept copies the sk after we've saved the callbacks, so we |
828 | don't want to save them a second time or comm errors will | |
829 | result in calling sk_error_report recursively. */ | |
988419a9 | 830 | add_sock(newsock, newcon); |
bd44e2b0 | 831 | addcon = newcon; |
fdda387f PC |
832 | } |
833 | ||
f1f1c1cc | 834 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
835 | |
836 | /* | |
837 | * Add it to the active queue in case we got data | |
25985edc | 838 | * between processing the accept adding the socket |
fdda387f PC |
839 | * to the read_sockets list |
840 | */ | |
bd44e2b0 PC |
841 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
842 | queue_work(recv_workqueue, &addcon->rwork); | |
f1f1c1cc | 843 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
844 | |
845 | return 0; | |
846 | ||
ac33d071 | 847 | accept_err: |
f1f1c1cc | 848 | mutex_unlock(&con->sock_mutex); |
3421fb15 | 849 | if (newsock) |
850 | sock_release(newsock); | |
fdda387f PC |
851 | |
852 | if (result != -EAGAIN) | |
617e82e1 | 853 | log_print("error accepting connection from node: %d", result); |
fdda387f PC |
854 | return result; |
855 | } | |
856 | ||
18df8a87 | 857 | static int sctp_accept_from_sock(struct connection *con) |
ee44b4bc MRL |
858 | { |
859 | /* Check that the new node is in the lockspace */ | |
860 | struct sctp_prim prim; | |
861 | int nodeid; | |
862 | int prim_len, ret; | |
863 | int addr_len; | |
864 | struct connection *newcon; | |
865 | struct connection *addcon; | |
866 | struct socket *newsock; | |
867 | ||
868 | mutex_lock(&connections_lock); | |
869 | if (!dlm_allow_conn) { | |
870 | mutex_unlock(&connections_lock); | |
871 | return -1; | |
872 | } | |
873 | mutex_unlock(&connections_lock); | |
874 | ||
875 | mutex_lock_nested(&con->sock_mutex, 0); | |
876 | ||
877 | ret = kernel_accept(con->sock, &newsock, O_NONBLOCK); | |
878 | if (ret < 0) | |
879 | goto accept_err; | |
880 | ||
881 | memset(&prim, 0, sizeof(struct sctp_prim)); | |
882 | prim_len = sizeof(struct sctp_prim); | |
883 | ||
884 | ret = kernel_getsockopt(newsock, IPPROTO_SCTP, SCTP_PRIMARY_ADDR, | |
885 | (char *)&prim, &prim_len); | |
886 | if (ret < 0) { | |
887 | log_print("getsockopt/sctp_primary_addr failed: %d", ret); | |
888 | goto accept_err; | |
889 | } | |
890 | ||
891 | make_sockaddr(&prim.ssp_addr, 0, &addr_len); | |
26c1ec2f WY |
892 | ret = addr_to_nodeid(&prim.ssp_addr, &nodeid); |
893 | if (ret) { | |
ee44b4bc MRL |
894 | unsigned char *b = (unsigned char *)&prim.ssp_addr; |
895 | ||
896 | log_print("reject connect from unknown addr"); | |
897 | print_hex_dump_bytes("ss: ", DUMP_PREFIX_NONE, | |
898 | b, sizeof(struct sockaddr_storage)); | |
899 | goto accept_err; | |
900 | } | |
901 | ||
902 | newcon = nodeid2con(nodeid, GFP_NOFS); | |
903 | if (!newcon) { | |
904 | ret = -ENOMEM; | |
905 | goto accept_err; | |
906 | } | |
907 | ||
908 | mutex_lock_nested(&newcon->sock_mutex, 1); | |
909 | ||
910 | if (newcon->sock) { | |
911 | struct connection *othercon = newcon->othercon; | |
912 | ||
913 | if (!othercon) { | |
914 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); | |
915 | if (!othercon) { | |
916 | log_print("failed to allocate incoming socket"); | |
917 | mutex_unlock(&newcon->sock_mutex); | |
918 | ret = -ENOMEM; | |
919 | goto accept_err; | |
920 | } | |
921 | othercon->nodeid = nodeid; | |
922 | othercon->rx_action = receive_from_sock; | |
923 | mutex_init(&othercon->sock_mutex); | |
26b41099 | 924 | INIT_LIST_HEAD(&othercon->writequeue); |
925 | spin_lock_init(&othercon->writequeue_lock); | |
ee44b4bc MRL |
926 | INIT_WORK(&othercon->swork, process_send_sockets); |
927 | INIT_WORK(&othercon->rwork, process_recv_sockets); | |
928 | set_bit(CF_IS_OTHERCON, &othercon->flags); | |
929 | } | |
c7355827 | 930 | mutex_lock_nested(&othercon->sock_mutex, 2); |
ee44b4bc MRL |
931 | if (!othercon->sock) { |
932 | newcon->othercon = othercon; | |
988419a9 | 933 | add_sock(newsock, othercon); |
ee44b4bc | 934 | addcon = othercon; |
c7355827 | 935 | mutex_unlock(&othercon->sock_mutex); |
ee44b4bc MRL |
936 | } else { |
937 | printk("Extra connection from node %d attempted\n", nodeid); | |
938 | ret = -EAGAIN; | |
c7355827 | 939 | mutex_unlock(&othercon->sock_mutex); |
ee44b4bc MRL |
940 | mutex_unlock(&newcon->sock_mutex); |
941 | goto accept_err; | |
942 | } | |
943 | } else { | |
ee44b4bc | 944 | newcon->rx_action = receive_from_sock; |
988419a9 | 945 | add_sock(newsock, newcon); |
ee44b4bc MRL |
946 | addcon = newcon; |
947 | } | |
948 | ||
949 | log_print("connected to %d", nodeid); | |
950 | ||
951 | mutex_unlock(&newcon->sock_mutex); | |
952 | ||
953 | /* | |
954 | * Add it to the active queue in case we got data | |
955 | * between processing the accept adding the socket | |
956 | * to the read_sockets list | |
957 | */ | |
958 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) | |
959 | queue_work(recv_workqueue, &addcon->rwork); | |
960 | mutex_unlock(&con->sock_mutex); | |
961 | ||
962 | return 0; | |
963 | ||
964 | accept_err: | |
965 | mutex_unlock(&con->sock_mutex); | |
966 | if (newsock) | |
967 | sock_release(newsock); | |
968 | if (ret != -EAGAIN) | |
969 | log_print("error accepting connection from node: %d", ret); | |
970 | ||
971 | return ret; | |
972 | } | |
973 | ||
6ed7257b PC |
974 | static void free_entry(struct writequeue_entry *e) |
975 | { | |
976 | __free_page(e->page); | |
977 | kfree(e); | |
978 | } | |
979 | ||
5d689871 MC |
980 | /* |
981 | * writequeue_entry_complete - try to delete and free write queue entry | |
982 | * @e: write queue entry to try to delete | |
983 | * @completed: bytes completed | |
984 | * | |
985 | * writequeue_lock must be held. | |
986 | */ | |
987 | static void writequeue_entry_complete(struct writequeue_entry *e, int completed) | |
988 | { | |
989 | e->offset += completed; | |
990 | e->len -= completed; | |
991 | ||
992 | if (e->len == 0 && e->users == 0) { | |
993 | list_del(&e->list); | |
994 | free_entry(e); | |
995 | } | |
996 | } | |
997 | ||
ee44b4bc MRL |
998 | /* |
999 | * sctp_bind_addrs - bind a SCTP socket to all our addresses | |
1000 | */ | |
1001 | static int sctp_bind_addrs(struct connection *con, uint16_t port) | |
1002 | { | |
1003 | struct sockaddr_storage localaddr; | |
1004 | int i, addr_len, result = 0; | |
1005 | ||
1006 | for (i = 0; i < dlm_local_count; i++) { | |
1007 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); | |
1008 | make_sockaddr(&localaddr, port, &addr_len); | |
1009 | ||
1010 | if (!i) | |
1011 | result = kernel_bind(con->sock, | |
1012 | (struct sockaddr *)&localaddr, | |
1013 | addr_len); | |
1014 | else | |
1015 | result = kernel_setsockopt(con->sock, SOL_SCTP, | |
1016 | SCTP_SOCKOPT_BINDX_ADD, | |
1017 | (char *)&localaddr, addr_len); | |
1018 | ||
1019 | if (result < 0) { | |
1020 | log_print("Can't bind to %d addr number %d, %d.\n", | |
1021 | port, i + 1, result); | |
1022 | break; | |
1023 | } | |
1024 | } | |
1025 | return result; | |
1026 | } | |
1027 | ||
6ed7257b PC |
1028 | /* Initiate an SCTP association. |
1029 | This is a special case of send_to_sock() in that we don't yet have a | |
1030 | peeled-off socket for this association, so we use the listening socket | |
1031 | and add the primary IP address of the remote node. | |
1032 | */ | |
ee44b4bc | 1033 | static void sctp_connect_to_sock(struct connection *con) |
6ed7257b | 1034 | { |
ee44b4bc MRL |
1035 | struct sockaddr_storage daddr; |
1036 | int one = 1; | |
1037 | int result; | |
1038 | int addr_len; | |
1039 | struct socket *sock; | |
f706d830 | 1040 | struct timeval tv = { .tv_sec = 5, .tv_usec = 0 }; |
ee44b4bc MRL |
1041 | |
1042 | if (con->nodeid == 0) { | |
1043 | log_print("attempt to connect sock 0 foiled"); | |
1044 | return; | |
1045 | } | |
6ed7257b | 1046 | |
5d689871 | 1047 | mutex_lock(&con->sock_mutex); |
6ed7257b | 1048 | |
ee44b4bc MRL |
1049 | /* Some odd races can cause double-connects, ignore them */ |
1050 | if (con->retries++ > MAX_CONNECT_RETRIES) | |
1051 | goto out; | |
1052 | ||
1053 | if (con->sock) { | |
1054 | log_print("node %d already connected.", con->nodeid); | |
1055 | goto out; | |
1056 | } | |
1057 | ||
1058 | memset(&daddr, 0, sizeof(daddr)); | |
1059 | result = nodeid_to_addr(con->nodeid, &daddr, NULL, true); | |
1060 | if (result < 0) { | |
6ed7257b | 1061 | log_print("no address for nodeid %d", con->nodeid); |
ee44b4bc | 1062 | goto out; |
6ed7257b | 1063 | } |
6ed7257b | 1064 | |
ee44b4bc MRL |
1065 | /* Create a socket to communicate with */ |
1066 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, | |
1067 | SOCK_STREAM, IPPROTO_SCTP, &sock); | |
1068 | if (result < 0) | |
1069 | goto socket_err; | |
6ed7257b | 1070 | |
ee44b4bc MRL |
1071 | con->rx_action = receive_from_sock; |
1072 | con->connect_action = sctp_connect_to_sock; | |
988419a9 | 1073 | add_sock(sock, con); |
6ed7257b | 1074 | |
ee44b4bc MRL |
1075 | /* Bind to all addresses. */ |
1076 | if (sctp_bind_addrs(con, 0)) | |
1077 | goto bind_err; | |
6ed7257b | 1078 | |
ee44b4bc | 1079 | make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len); |
6ed7257b | 1080 | |
ee44b4bc | 1081 | log_print("connecting to %d", con->nodeid); |
6ed7257b | 1082 | |
ee44b4bc | 1083 | /* Turn off Nagle's algorithm */ |
b09c603c | 1084 | kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one, |
ee44b4bc | 1085 | sizeof(one)); |
6ed7257b | 1086 | |
f706d830 GH |
1087 | /* |
1088 | * Make sock->ops->connect() function return in specified time, | |
1089 | * since O_NONBLOCK argument in connect() function does not work here, | |
1090 | * then, we should restore the default value of this attribute. | |
1091 | */ | |
45bdc661 | 1092 | kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *)&tv, |
f706d830 | 1093 | sizeof(tv)); |
ee44b4bc | 1094 | result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len, |
da3627c3 | 1095 | 0); |
f706d830 | 1096 | memset(&tv, 0, sizeof(tv)); |
45bdc661 | 1097 | kernel_setsockopt(sock, SOL_SOCKET, SO_SNDTIMEO_OLD, (char *)&tv, |
f706d830 GH |
1098 | sizeof(tv)); |
1099 | ||
ee44b4bc MRL |
1100 | if (result == -EINPROGRESS) |
1101 | result = 0; | |
1102 | if (result == 0) | |
1103 | goto out; | |
98e1b60e | 1104 | |
ee44b4bc MRL |
1105 | bind_err: |
1106 | con->sock = NULL; | |
1107 | sock_release(sock); | |
6ed7257b | 1108 | |
ee44b4bc MRL |
1109 | socket_err: |
1110 | /* | |
1111 | * Some errors are fatal and this list might need adjusting. For other | |
1112 | * errors we try again until the max number of retries is reached. | |
1113 | */ | |
1114 | if (result != -EHOSTUNREACH && | |
1115 | result != -ENETUNREACH && | |
1116 | result != -ENETDOWN && | |
1117 | result != -EINVAL && | |
1118 | result != -EPROTONOSUPPORT) { | |
1119 | log_print("connect %d try %d error %d", con->nodeid, | |
1120 | con->retries, result); | |
1121 | mutex_unlock(&con->sock_mutex); | |
1122 | msleep(1000); | |
ee44b4bc MRL |
1123 | lowcomms_connect_sock(con); |
1124 | return; | |
6ed7257b | 1125 | } |
5d689871 | 1126 | |
ee44b4bc | 1127 | out: |
5d689871 | 1128 | mutex_unlock(&con->sock_mutex); |
6ed7257b PC |
1129 | } |
1130 | ||
fdda387f | 1131 | /* Connect a new socket to its peer */ |
6ed7257b | 1132 | static void tcp_connect_to_sock(struct connection *con) |
fdda387f | 1133 | { |
6bd8feda | 1134 | struct sockaddr_storage saddr, src_addr; |
fdda387f | 1135 | int addr_len; |
a89d63a1 | 1136 | struct socket *sock = NULL; |
cb2d45da | 1137 | int one = 1; |
36b71a8b | 1138 | int result; |
fdda387f PC |
1139 | |
1140 | if (con->nodeid == 0) { | |
1141 | log_print("attempt to connect sock 0 foiled"); | |
ac33d071 | 1142 | return; |
fdda387f PC |
1143 | } |
1144 | ||
f1f1c1cc | 1145 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1146 | if (con->retries++ > MAX_CONNECT_RETRIES) |
1147 | goto out; | |
1148 | ||
1149 | /* Some odd races can cause double-connects, ignore them */ | |
36b71a8b | 1150 | if (con->sock) |
fdda387f | 1151 | goto out; |
fdda387f PC |
1152 | |
1153 | /* Create a socket to communicate with */ | |
eeb1bd5c EB |
1154 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
1155 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
fdda387f PC |
1156 | if (result < 0) |
1157 | goto out_err; | |
1158 | ||
1159 | memset(&saddr, 0, sizeof(saddr)); | |
98e1b60e | 1160 | result = nodeid_to_addr(con->nodeid, &saddr, NULL, false); |
36b71a8b DT |
1161 | if (result < 0) { |
1162 | log_print("no address for nodeid %d", con->nodeid); | |
ac33d071 | 1163 | goto out_err; |
36b71a8b | 1164 | } |
fdda387f | 1165 | |
fdda387f | 1166 | con->rx_action = receive_from_sock; |
6ed7257b | 1167 | con->connect_action = tcp_connect_to_sock; |
988419a9 | 1168 | add_sock(sock, con); |
fdda387f | 1169 | |
6bd8feda LH |
1170 | /* Bind to our cluster-known address connecting to avoid |
1171 | routing problems */ | |
1172 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); | |
1173 | make_sockaddr(&src_addr, 0, &addr_len); | |
1174 | result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, | |
1175 | addr_len); | |
1176 | if (result < 0) { | |
1177 | log_print("could not bind for connect: %d", result); | |
1178 | /* This *may* not indicate a critical error */ | |
1179 | } | |
1180 | ||
68c817a1 | 1181 | make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f | 1182 | |
fdda387f | 1183 | log_print("connecting to %d", con->nodeid); |
cb2d45da DT |
1184 | |
1185 | /* Turn off Nagle's algorithm */ | |
1186 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
1187 | sizeof(one)); | |
1188 | ||
36b71a8b | 1189 | result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, |
ac33d071 | 1190 | O_NONBLOCK); |
fdda387f PC |
1191 | if (result == -EINPROGRESS) |
1192 | result = 0; | |
ac33d071 PC |
1193 | if (result == 0) |
1194 | goto out; | |
fdda387f | 1195 | |
ac33d071 | 1196 | out_err: |
fdda387f PC |
1197 | if (con->sock) { |
1198 | sock_release(con->sock); | |
1199 | con->sock = NULL; | |
a89d63a1 CD |
1200 | } else if (sock) { |
1201 | sock_release(sock); | |
fdda387f PC |
1202 | } |
1203 | /* | |
1204 | * Some errors are fatal and this list might need adjusting. For other | |
1205 | * errors we try again until the max number of retries is reached. | |
1206 | */ | |
36b71a8b DT |
1207 | if (result != -EHOSTUNREACH && |
1208 | result != -ENETUNREACH && | |
1209 | result != -ENETDOWN && | |
1210 | result != -EINVAL && | |
1211 | result != -EPROTONOSUPPORT) { | |
1212 | log_print("connect %d try %d error %d", con->nodeid, | |
1213 | con->retries, result); | |
1214 | mutex_unlock(&con->sock_mutex); | |
1215 | msleep(1000); | |
fdda387f | 1216 | lowcomms_connect_sock(con); |
36b71a8b | 1217 | return; |
fdda387f | 1218 | } |
ac33d071 | 1219 | out: |
f1f1c1cc | 1220 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1221 | return; |
fdda387f PC |
1222 | } |
1223 | ||
6ed7257b PC |
1224 | static struct socket *tcp_create_listen_sock(struct connection *con, |
1225 | struct sockaddr_storage *saddr) | |
fdda387f | 1226 | { |
ac33d071 | 1227 | struct socket *sock = NULL; |
fdda387f PC |
1228 | int result = 0; |
1229 | int one = 1; | |
1230 | int addr_len; | |
1231 | ||
6ed7257b | 1232 | if (dlm_local_addr[0]->ss_family == AF_INET) |
fdda387f PC |
1233 | addr_len = sizeof(struct sockaddr_in); |
1234 | else | |
1235 | addr_len = sizeof(struct sockaddr_in6); | |
1236 | ||
1237 | /* Create a socket to communicate with */ | |
eeb1bd5c EB |
1238 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
1239 | SOCK_STREAM, IPPROTO_TCP, &sock); | |
fdda387f | 1240 | if (result < 0) { |
617e82e1 | 1241 | log_print("Can't create listening comms socket"); |
fdda387f PC |
1242 | goto create_out; |
1243 | } | |
1244 | ||
cb2d45da DT |
1245 | /* Turn off Nagle's algorithm */ |
1246 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
1247 | sizeof(one)); | |
1248 | ||
6ed7257b PC |
1249 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
1250 | (char *)&one, sizeof(one)); | |
1251 | ||
fdda387f | 1252 | if (result < 0) { |
617e82e1 | 1253 | log_print("Failed to set SO_REUSEADDR on socket: %d", result); |
fdda387f | 1254 | } |
93eaadeb | 1255 | write_lock_bh(&sock->sk->sk_callback_lock); |
b81171cb | 1256 | sock->sk->sk_user_data = con; |
cc661fc9 | 1257 | save_listen_callbacks(sock); |
6ed7257b PC |
1258 | con->rx_action = tcp_accept_from_sock; |
1259 | con->connect_action = tcp_connect_to_sock; | |
93eaadeb | 1260 | write_unlock_bh(&sock->sk->sk_callback_lock); |
fdda387f PC |
1261 | |
1262 | /* Bind to our port */ | |
68c817a1 | 1263 | make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f PC |
1264 | result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); |
1265 | if (result < 0) { | |
617e82e1 | 1266 | log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1267 | sock_release(sock); |
1268 | sock = NULL; | |
1269 | con->sock = NULL; | |
1270 | goto create_out; | |
1271 | } | |
6ed7257b | 1272 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
ac33d071 | 1273 | (char *)&one, sizeof(one)); |
fdda387f | 1274 | if (result < 0) { |
617e82e1 | 1275 | log_print("Set keepalive failed: %d", result); |
fdda387f PC |
1276 | } |
1277 | ||
1278 | result = sock->ops->listen(sock, 5); | |
1279 | if (result < 0) { | |
617e82e1 | 1280 | log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1281 | sock_release(sock); |
1282 | sock = NULL; | |
1283 | goto create_out; | |
1284 | } | |
1285 | ||
ac33d071 | 1286 | create_out: |
fdda387f PC |
1287 | return sock; |
1288 | } | |
1289 | ||
6ed7257b PC |
1290 | /* Get local addresses */ |
1291 | static void init_local(void) | |
1292 | { | |
1293 | struct sockaddr_storage sas, *addr; | |
1294 | int i; | |
1295 | ||
30d3a237 | 1296 | dlm_local_count = 0; |
1b189b88 | 1297 | for (i = 0; i < DLM_MAX_ADDR_COUNT; i++) { |
6ed7257b PC |
1298 | if (dlm_our_addr(&sas, i)) |
1299 | break; | |
1300 | ||
5c93f56f | 1301 | addr = kmemdup(&sas, sizeof(*addr), GFP_NOFS); |
6ed7257b PC |
1302 | if (!addr) |
1303 | break; | |
6ed7257b PC |
1304 | dlm_local_addr[dlm_local_count++] = addr; |
1305 | } | |
1306 | } | |
1307 | ||
6ed7257b PC |
1308 | /* Initialise SCTP socket and bind to all interfaces */ |
1309 | static int sctp_listen_for_all(void) | |
1310 | { | |
1311 | struct socket *sock = NULL; | |
ee44b4bc | 1312 | int result = -EINVAL; |
573c24c4 | 1313 | struct connection *con = nodeid2con(0, GFP_NOFS); |
6ed7257b | 1314 | int bufsize = NEEDED_RMEM; |
86e92ad2 | 1315 | int one = 1; |
6ed7257b PC |
1316 | |
1317 | if (!con) | |
1318 | return -ENOMEM; | |
1319 | ||
1320 | log_print("Using SCTP for communications"); | |
1321 | ||
eeb1bd5c | 1322 | result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family, |
ee44b4bc | 1323 | SOCK_STREAM, IPPROTO_SCTP, &sock); |
6ed7257b PC |
1324 | if (result < 0) { |
1325 | log_print("Can't create comms socket, check SCTP is loaded"); | |
1326 | goto out; | |
1327 | } | |
1328 | ||
df61c952 | 1329 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, |
6ed7257b PC |
1330 | (char *)&bufsize, sizeof(bufsize)); |
1331 | if (result) | |
617e82e1 | 1332 | log_print("Error increasing buffer space on socket %d", result); |
6ed7257b | 1333 | |
86e92ad2 MC |
1334 | result = kernel_setsockopt(sock, SOL_SCTP, SCTP_NODELAY, (char *)&one, |
1335 | sizeof(one)); | |
1336 | if (result < 0) | |
1337 | log_print("Could not set SCTP NODELAY error %d\n", result); | |
1338 | ||
b81171cb | 1339 | write_lock_bh(&sock->sk->sk_callback_lock); |
6ed7257b PC |
1340 | /* Init con struct */ |
1341 | sock->sk->sk_user_data = con; | |
cc661fc9 | 1342 | save_listen_callbacks(sock); |
6ed7257b PC |
1343 | con->sock = sock; |
1344 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
ee44b4bc MRL |
1345 | con->rx_action = sctp_accept_from_sock; |
1346 | con->connect_action = sctp_connect_to_sock; | |
6ed7257b | 1347 | |
b81171cb BP |
1348 | write_unlock_bh(&sock->sk->sk_callback_lock); |
1349 | ||
ee44b4bc MRL |
1350 | /* Bind to all addresses. */ |
1351 | if (sctp_bind_addrs(con, dlm_config.ci_tcp_port)) | |
1352 | goto create_delsock; | |
6ed7257b PC |
1353 | |
1354 | result = sock->ops->listen(sock, 5); | |
1355 | if (result < 0) { | |
1356 | log_print("Can't set socket listening"); | |
1357 | goto create_delsock; | |
1358 | } | |
1359 | ||
1360 | return 0; | |
1361 | ||
1362 | create_delsock: | |
1363 | sock_release(sock); | |
1364 | con->sock = NULL; | |
1365 | out: | |
1366 | return result; | |
1367 | } | |
1368 | ||
1369 | static int tcp_listen_for_all(void) | |
fdda387f PC |
1370 | { |
1371 | struct socket *sock = NULL; | |
573c24c4 | 1372 | struct connection *con = nodeid2con(0, GFP_NOFS); |
fdda387f PC |
1373 | int result = -EINVAL; |
1374 | ||
6ed7257b PC |
1375 | if (!con) |
1376 | return -ENOMEM; | |
1377 | ||
fdda387f | 1378 | /* We don't support multi-homed hosts */ |
6ed7257b | 1379 | if (dlm_local_addr[1] != NULL) { |
617e82e1 DT |
1380 | log_print("TCP protocol can't handle multi-homed hosts, " |
1381 | "try SCTP"); | |
6ed7257b PC |
1382 | return -EINVAL; |
1383 | } | |
1384 | ||
1385 | log_print("Using TCP for communications"); | |
1386 | ||
6ed7257b | 1387 | sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
fdda387f | 1388 | if (sock) { |
988419a9 | 1389 | add_sock(sock, con); |
fdda387f PC |
1390 | result = 0; |
1391 | } | |
1392 | else { | |
1393 | result = -EADDRINUSE; | |
1394 | } | |
1395 | ||
1396 | return result; | |
1397 | } | |
1398 | ||
1399 | ||
1400 | ||
1401 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, | |
1402 | gfp_t allocation) | |
1403 | { | |
1404 | struct writequeue_entry *entry; | |
1405 | ||
1406 | entry = kmalloc(sizeof(struct writequeue_entry), allocation); | |
1407 | if (!entry) | |
1408 | return NULL; | |
1409 | ||
1410 | entry->page = alloc_page(allocation); | |
1411 | if (!entry->page) { | |
1412 | kfree(entry); | |
1413 | return NULL; | |
1414 | } | |
1415 | ||
1416 | entry->offset = 0; | |
1417 | entry->len = 0; | |
1418 | entry->end = 0; | |
1419 | entry->users = 0; | |
1420 | entry->con = con; | |
1421 | ||
1422 | return entry; | |
1423 | } | |
1424 | ||
617e82e1 | 1425 | void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
fdda387f PC |
1426 | { |
1427 | struct connection *con; | |
1428 | struct writequeue_entry *e; | |
1429 | int offset = 0; | |
fdda387f | 1430 | |
fdda387f PC |
1431 | con = nodeid2con(nodeid, allocation); |
1432 | if (!con) | |
1433 | return NULL; | |
1434 | ||
4edde74e | 1435 | spin_lock(&con->writequeue_lock); |
fdda387f | 1436 | e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
ac33d071 | 1437 | if ((&e->list == &con->writequeue) || |
09cbfeaf | 1438 | (PAGE_SIZE - e->end < len)) { |
fdda387f PC |
1439 | e = NULL; |
1440 | } else { | |
1441 | offset = e->end; | |
1442 | e->end += len; | |
eeee2b5f | 1443 | e->users++; |
fdda387f PC |
1444 | } |
1445 | spin_unlock(&con->writequeue_lock); | |
1446 | ||
1447 | if (e) { | |
ac33d071 | 1448 | got_one: |
fdda387f PC |
1449 | *ppc = page_address(e->page) + offset; |
1450 | return e; | |
1451 | } | |
1452 | ||
1453 | e = new_writequeue_entry(con, allocation); | |
1454 | if (e) { | |
1455 | spin_lock(&con->writequeue_lock); | |
1456 | offset = e->end; | |
1457 | e->end += len; | |
eeee2b5f | 1458 | e->users++; |
fdda387f PC |
1459 | list_add_tail(&e->list, &con->writequeue); |
1460 | spin_unlock(&con->writequeue_lock); | |
1461 | goto got_one; | |
1462 | } | |
1463 | return NULL; | |
1464 | } | |
1465 | ||
1466 | void dlm_lowcomms_commit_buffer(void *mh) | |
1467 | { | |
1468 | struct writequeue_entry *e = (struct writequeue_entry *)mh; | |
1469 | struct connection *con = e->con; | |
1470 | int users; | |
1471 | ||
4edde74e | 1472 | spin_lock(&con->writequeue_lock); |
fdda387f PC |
1473 | users = --e->users; |
1474 | if (users) | |
1475 | goto out; | |
1476 | e->len = e->end - e->offset; | |
fdda387f PC |
1477 | spin_unlock(&con->writequeue_lock); |
1478 | ||
01da24d3 | 1479 | queue_work(send_workqueue, &con->swork); |
fdda387f PC |
1480 | return; |
1481 | ||
ac33d071 | 1482 | out: |
fdda387f PC |
1483 | spin_unlock(&con->writequeue_lock); |
1484 | return; | |
1485 | } | |
1486 | ||
fdda387f | 1487 | /* Send a message */ |
ac33d071 | 1488 | static void send_to_sock(struct connection *con) |
fdda387f PC |
1489 | { |
1490 | int ret = 0; | |
fdda387f PC |
1491 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1492 | struct writequeue_entry *e; | |
1493 | int len, offset; | |
f92c8dd7 | 1494 | int count = 0; |
fdda387f | 1495 | |
f1f1c1cc | 1496 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1497 | if (con->sock == NULL) |
1498 | goto out_connect; | |
1499 | ||
fdda387f PC |
1500 | spin_lock(&con->writequeue_lock); |
1501 | for (;;) { | |
1502 | e = list_entry(con->writequeue.next, struct writequeue_entry, | |
1503 | list); | |
1504 | if ((struct list_head *) e == &con->writequeue) | |
1505 | break; | |
1506 | ||
1507 | len = e->len; | |
1508 | offset = e->offset; | |
1509 | BUG_ON(len == 0 && e->users == 0); | |
1510 | spin_unlock(&con->writequeue_lock); | |
1511 | ||
1512 | ret = 0; | |
1513 | if (len) { | |
1329e3f2 PB |
1514 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
1515 | msg_flags); | |
d66f8277 | 1516 | if (ret == -EAGAIN || ret == 0) { |
b36930dd | 1517 | if (ret == -EAGAIN && |
9cd3e072 | 1518 | test_bit(SOCKWQ_ASYNC_NOSPACE, &con->sock->flags) && |
b36930dd DM |
1519 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { |
1520 | /* Notify TCP that we're limited by the | |
1521 | * application window size. | |
1522 | */ | |
1523 | set_bit(SOCK_NOSPACE, &con->sock->flags); | |
1524 | con->sock->sk->sk_write_pending++; | |
1525 | } | |
d66f8277 | 1526 | cond_resched(); |
fdda387f | 1527 | goto out; |
9c5bef58 | 1528 | } else if (ret < 0) |
fdda387f | 1529 | goto send_error; |
d66f8277 | 1530 | } |
f92c8dd7 BP |
1531 | |
1532 | /* Don't starve people filling buffers */ | |
1533 | if (++count >= MAX_SEND_MSG_COUNT) { | |
ac33d071 | 1534 | cond_resched(); |
f92c8dd7 BP |
1535 | count = 0; |
1536 | } | |
fdda387f PC |
1537 | |
1538 | spin_lock(&con->writequeue_lock); | |
5d689871 | 1539 | writequeue_entry_complete(e, ret); |
fdda387f PC |
1540 | } |
1541 | spin_unlock(&con->writequeue_lock); | |
ac33d071 | 1542 | out: |
f1f1c1cc | 1543 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1544 | return; |
fdda387f | 1545 | |
ac33d071 | 1546 | send_error: |
f1f1c1cc | 1547 | mutex_unlock(&con->sock_mutex); |
c553e173 | 1548 | close_connection(con, true, false, true); |
01da24d3 BP |
1549 | /* Requeue the send work. When the work daemon runs again, it will try |
1550 | a new connection, then call this function again. */ | |
1551 | queue_work(send_workqueue, &con->swork); | |
ac33d071 | 1552 | return; |
fdda387f | 1553 | |
ac33d071 | 1554 | out_connect: |
f1f1c1cc | 1555 | mutex_unlock(&con->sock_mutex); |
01da24d3 BP |
1556 | queue_work(send_workqueue, &con->swork); |
1557 | cond_resched(); | |
fdda387f PC |
1558 | } |
1559 | ||
1560 | static void clean_one_writequeue(struct connection *con) | |
1561 | { | |
5e9ccc37 | 1562 | struct writequeue_entry *e, *safe; |
fdda387f PC |
1563 | |
1564 | spin_lock(&con->writequeue_lock); | |
5e9ccc37 | 1565 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f PC |
1566 | list_del(&e->list); |
1567 | free_entry(e); | |
1568 | } | |
1569 | spin_unlock(&con->writequeue_lock); | |
1570 | } | |
1571 | ||
1572 | /* Called from recovery when it knows that a node has | |
1573 | left the cluster */ | |
1574 | int dlm_lowcomms_close(int nodeid) | |
1575 | { | |
1576 | struct connection *con; | |
36b71a8b | 1577 | struct dlm_node_addr *na; |
fdda387f | 1578 | |
fdda387f PC |
1579 | log_print("closing connection to node %d", nodeid); |
1580 | con = nodeid2con(nodeid, 0); | |
1581 | if (con) { | |
063c4c99 | 1582 | set_bit(CF_CLOSE, &con->flags); |
0d737a8c | 1583 | close_connection(con, true, true, true); |
fdda387f | 1584 | clean_one_writequeue(con); |
fdda387f | 1585 | } |
36b71a8b DT |
1586 | |
1587 | spin_lock(&dlm_node_addrs_spin); | |
1588 | na = find_node_addr(nodeid); | |
1589 | if (na) { | |
1590 | list_del(&na->list); | |
1591 | while (na->addr_count--) | |
1592 | kfree(na->addr[na->addr_count]); | |
1593 | kfree(na); | |
1594 | } | |
1595 | spin_unlock(&dlm_node_addrs_spin); | |
1596 | ||
fdda387f | 1597 | return 0; |
fdda387f PC |
1598 | } |
1599 | ||
6ed7257b | 1600 | /* Receive workqueue function */ |
1d6e8131 | 1601 | static void process_recv_sockets(struct work_struct *work) |
fdda387f | 1602 | { |
1d6e8131 PC |
1603 | struct connection *con = container_of(work, struct connection, rwork); |
1604 | int err; | |
fdda387f | 1605 | |
1d6e8131 PC |
1606 | clear_bit(CF_READ_PENDING, &con->flags); |
1607 | do { | |
1608 | err = con->rx_action(con); | |
1609 | } while (!err); | |
fdda387f PC |
1610 | } |
1611 | ||
6ed7257b | 1612 | /* Send workqueue function */ |
1d6e8131 | 1613 | static void process_send_sockets(struct work_struct *work) |
fdda387f | 1614 | { |
1d6e8131 | 1615 | struct connection *con = container_of(work, struct connection, swork); |
fdda387f | 1616 | |
8a4abb08 | 1617 | clear_bit(CF_WRITE_PENDING, &con->flags); |
61d9102b | 1618 | if (con->sock == NULL) /* not mutex protected so check it inside too */ |
6ed7257b | 1619 | con->connect_action(con); |
01da24d3 | 1620 | if (!list_empty(&con->writequeue)) |
063c4c99 | 1621 | send_to_sock(con); |
fdda387f PC |
1622 | } |
1623 | ||
1624 | ||
1625 | /* Discard all entries on the write queues */ | |
1626 | static void clean_writequeues(void) | |
1627 | { | |
5e9ccc37 | 1628 | foreach_conn(clean_one_writequeue); |
fdda387f PC |
1629 | } |
1630 | ||
1d6e8131 | 1631 | static void work_stop(void) |
fdda387f | 1632 | { |
1d6e8131 PC |
1633 | destroy_workqueue(recv_workqueue); |
1634 | destroy_workqueue(send_workqueue); | |
fdda387f PC |
1635 | } |
1636 | ||
1d6e8131 | 1637 | static int work_start(void) |
fdda387f | 1638 | { |
e43f055a DT |
1639 | recv_workqueue = alloc_workqueue("dlm_recv", |
1640 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1641 | if (!recv_workqueue) { |
1642 | log_print("can't start dlm_recv"); | |
1643 | return -ENOMEM; | |
fdda387f | 1644 | } |
fdda387f | 1645 | |
e43f055a DT |
1646 | send_workqueue = alloc_workqueue("dlm_send", |
1647 | WQ_UNBOUND | WQ_MEM_RECLAIM, 1); | |
b9d41052 NK |
1648 | if (!send_workqueue) { |
1649 | log_print("can't start dlm_send"); | |
1d6e8131 | 1650 | destroy_workqueue(recv_workqueue); |
b9d41052 | 1651 | return -ENOMEM; |
fdda387f | 1652 | } |
fdda387f PC |
1653 | |
1654 | return 0; | |
1655 | } | |
1656 | ||
f0fb83cb | 1657 | static void _stop_conn(struct connection *con, bool and_other) |
fdda387f | 1658 | { |
f0fb83cb | 1659 | mutex_lock(&con->sock_mutex); |
173a31fe | 1660 | set_bit(CF_CLOSE, &con->flags); |
f0fb83cb | 1661 | set_bit(CF_READ_PENDING, &con->flags); |
8a4abb08 | 1662 | set_bit(CF_WRITE_PENDING, &con->flags); |
93eaadeb | 1663 | if (con->sock && con->sock->sk) { |
1664 | write_lock_bh(&con->sock->sk->sk_callback_lock); | |
5e9ccc37 | 1665 | con->sock->sk->sk_user_data = NULL; |
93eaadeb | 1666 | write_unlock_bh(&con->sock->sk->sk_callback_lock); |
1667 | } | |
f0fb83cb | 1668 | if (con->othercon && and_other) |
1669 | _stop_conn(con->othercon, false); | |
1670 | mutex_unlock(&con->sock_mutex); | |
1671 | } | |
1672 | ||
1673 | static void stop_conn(struct connection *con) | |
1674 | { | |
1675 | _stop_conn(con, true); | |
5e9ccc37 | 1676 | } |
fdda387f | 1677 | |
5e9ccc37 CC |
1678 | static void free_conn(struct connection *con) |
1679 | { | |
0d737a8c | 1680 | close_connection(con, true, true, true); |
5e9ccc37 CC |
1681 | if (con->othercon) |
1682 | kmem_cache_free(con_cache, con->othercon); | |
1683 | hlist_del(&con->list); | |
1684 | kmem_cache_free(con_cache, con); | |
1685 | } | |
1686 | ||
f0fb83cb | 1687 | static void work_flush(void) |
1688 | { | |
1689 | int ok; | |
1690 | int i; | |
1691 | struct hlist_node *n; | |
1692 | struct connection *con; | |
1693 | ||
1694 | flush_workqueue(recv_workqueue); | |
1695 | flush_workqueue(send_workqueue); | |
1696 | do { | |
1697 | ok = 1; | |
1698 | foreach_conn(stop_conn); | |
1699 | flush_workqueue(recv_workqueue); | |
1700 | flush_workqueue(send_workqueue); | |
1701 | for (i = 0; i < CONN_HASH_SIZE && ok; i++) { | |
1702 | hlist_for_each_entry_safe(con, n, | |
1703 | &connection_hash[i], list) { | |
1704 | ok &= test_bit(CF_READ_PENDING, &con->flags); | |
8a4abb08 | 1705 | ok &= test_bit(CF_WRITE_PENDING, &con->flags); |
1706 | if (con->othercon) { | |
f0fb83cb | 1707 | ok &= test_bit(CF_READ_PENDING, |
1708 | &con->othercon->flags); | |
8a4abb08 | 1709 | ok &= test_bit(CF_WRITE_PENDING, |
1710 | &con->othercon->flags); | |
1711 | } | |
f0fb83cb | 1712 | } |
1713 | } | |
1714 | } while (!ok); | |
1715 | } | |
1716 | ||
5e9ccc37 CC |
1717 | void dlm_lowcomms_stop(void) |
1718 | { | |
ac33d071 | 1719 | /* Set all the flags to prevent any |
fdda387f PC |
1720 | socket activity. |
1721 | */ | |
7a936ce7 | 1722 | mutex_lock(&connections_lock); |
513ef596 | 1723 | dlm_allow_conn = 0; |
f0fb83cb | 1724 | mutex_unlock(&connections_lock); |
1725 | work_flush(); | |
3a8db798 MRL |
1726 | clean_writequeues(); |
1727 | foreach_conn(free_conn); | |
1d6e8131 | 1728 | work_stop(); |
6ed7257b | 1729 | |
fdda387f PC |
1730 | kmem_cache_destroy(con_cache); |
1731 | } | |
1732 | ||
fdda387f PC |
1733 | int dlm_lowcomms_start(void) |
1734 | { | |
6ed7257b PC |
1735 | int error = -EINVAL; |
1736 | struct connection *con; | |
5e9ccc37 CC |
1737 | int i; |
1738 | ||
1739 | for (i = 0; i < CONN_HASH_SIZE; i++) | |
1740 | INIT_HLIST_HEAD(&connection_hash[i]); | |
fdda387f | 1741 | |
6ed7257b PC |
1742 | init_local(); |
1743 | if (!dlm_local_count) { | |
617e82e1 | 1744 | error = -ENOTCONN; |
fdda387f | 1745 | log_print("no local IP address has been set"); |
513ef596 | 1746 | goto fail; |
fdda387f PC |
1747 | } |
1748 | ||
6ed7257b | 1749 | error = -ENOMEM; |
fdda387f | 1750 | con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
ac33d071 | 1751 | __alignof__(struct connection), 0, |
20c2df83 | 1752 | NULL); |
fdda387f | 1753 | if (!con_cache) |
513ef596 DT |
1754 | goto fail; |
1755 | ||
1756 | error = work_start(); | |
1757 | if (error) | |
1758 | goto fail_destroy; | |
1759 | ||
1760 | dlm_allow_conn = 1; | |
fdda387f | 1761 | |
fdda387f | 1762 | /* Start listening */ |
6ed7257b PC |
1763 | if (dlm_config.ci_protocol == 0) |
1764 | error = tcp_listen_for_all(); | |
1765 | else | |
1766 | error = sctp_listen_for_all(); | |
fdda387f PC |
1767 | if (error) |
1768 | goto fail_unlisten; | |
1769 | ||
fdda387f PC |
1770 | return 0; |
1771 | ||
ac33d071 | 1772 | fail_unlisten: |
513ef596 | 1773 | dlm_allow_conn = 0; |
6ed7257b PC |
1774 | con = nodeid2con(0,0); |
1775 | if (con) { | |
0d737a8c | 1776 | close_connection(con, false, true, true); |
6ed7257b PC |
1777 | kmem_cache_free(con_cache, con); |
1778 | } | |
513ef596 | 1779 | fail_destroy: |
fdda387f | 1780 | kmem_cache_destroy(con_cache); |
513ef596 | 1781 | fail: |
fdda387f PC |
1782 | return error; |
1783 | } | |
36b71a8b DT |
1784 | |
1785 | void dlm_lowcomms_exit(void) | |
1786 | { | |
1787 | struct dlm_node_addr *na, *safe; | |
1788 | ||
1789 | spin_lock(&dlm_node_addrs_spin); | |
1790 | list_for_each_entry_safe(na, safe, &dlm_node_addrs, list) { | |
1791 | list_del(&na->list); | |
1792 | while (na->addr_count--) | |
1793 | kfree(na->addr[na->addr_count]); | |
1794 | kfree(na); | |
1795 | } | |
1796 | spin_unlock(&dlm_node_addrs_spin); | |
1797 | } |