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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> |
6ed7257b | 55 | #include <net/sctp/user.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 | |
fdda387f | 66 | struct cbuf { |
ac33d071 PC |
67 | unsigned int base; |
68 | unsigned int len; | |
69 | unsigned int mask; | |
fdda387f PC |
70 | }; |
71 | ||
ac33d071 PC |
72 | static void cbuf_add(struct cbuf *cb, int n) |
73 | { | |
74 | cb->len += n; | |
75 | } | |
fdda387f | 76 | |
ac33d071 PC |
77 | static int cbuf_data(struct cbuf *cb) |
78 | { | |
79 | return ((cb->base + cb->len) & cb->mask); | |
80 | } | |
81 | ||
82 | static void cbuf_init(struct cbuf *cb, int size) | |
83 | { | |
84 | cb->base = cb->len = 0; | |
85 | cb->mask = size-1; | |
86 | } | |
87 | ||
88 | static void cbuf_eat(struct cbuf *cb, int n) | |
89 | { | |
90 | cb->len -= n; | |
91 | cb->base += n; | |
92 | cb->base &= cb->mask; | |
93 | } | |
94 | ||
95 | static bool cbuf_empty(struct cbuf *cb) | |
96 | { | |
97 | return cb->len == 0; | |
98 | } | |
fdda387f | 99 | |
fdda387f PC |
100 | struct connection { |
101 | struct socket *sock; /* NULL if not connected */ | |
102 | uint32_t nodeid; /* So we know who we are in the list */ | |
f1f1c1cc | 103 | struct mutex sock_mutex; |
6ed7257b | 104 | unsigned long flags; |
fdda387f PC |
105 | #define CF_READ_PENDING 1 |
106 | #define CF_WRITE_PENDING 2 | |
107 | #define CF_CONNECT_PENDING 3 | |
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 |
ac33d071 | 112 | struct list_head writequeue; /* List of outgoing writequeue_entries */ |
fdda387f PC |
113 | spinlock_t writequeue_lock; |
114 | int (*rx_action) (struct connection *); /* What to do when active */ | |
6ed7257b | 115 | void (*connect_action) (struct connection *); /* What to do to connect */ |
fdda387f PC |
116 | struct page *rx_page; |
117 | struct cbuf cb; | |
118 | int retries; | |
fdda387f | 119 | #define MAX_CONNECT_RETRIES 3 |
6ed7257b | 120 | int sctp_assoc; |
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 | ||
6ed7257b PC |
139 | static struct sockaddr_storage *dlm_local_addr[DLM_MAX_ADDR_COUNT]; |
140 | static int dlm_local_count; | |
fdda387f | 141 | |
1d6e8131 PC |
142 | /* Work queues */ |
143 | static struct workqueue_struct *recv_workqueue; | |
144 | static struct workqueue_struct *send_workqueue; | |
fdda387f | 145 | |
5e9ccc37 | 146 | static struct hlist_head connection_hash[CONN_HASH_SIZE]; |
7a936ce7 | 147 | static DEFINE_MUTEX(connections_lock); |
c80e7c83 | 148 | static struct kmem_cache *con_cache; |
fdda387f | 149 | |
1d6e8131 PC |
150 | static void process_recv_sockets(struct work_struct *work); |
151 | static void process_send_sockets(struct work_struct *work); | |
fdda387f | 152 | |
5e9ccc37 CC |
153 | |
154 | /* This is deliberately very simple because most clusters have simple | |
155 | sequential nodeids, so we should be able to go straight to a connection | |
156 | struct in the array */ | |
157 | static inline int nodeid_hash(int nodeid) | |
158 | { | |
159 | return nodeid & (CONN_HASH_SIZE-1); | |
160 | } | |
161 | ||
162 | static struct connection *__find_con(int nodeid) | |
163 | { | |
164 | int r; | |
165 | struct hlist_node *h; | |
166 | struct connection *con; | |
167 | ||
168 | r = nodeid_hash(nodeid); | |
169 | ||
170 | hlist_for_each_entry(con, h, &connection_hash[r], list) { | |
171 | if (con->nodeid == nodeid) | |
172 | return con; | |
173 | } | |
174 | return NULL; | |
175 | } | |
176 | ||
6ed7257b PC |
177 | /* |
178 | * If 'allocation' is zero then we don't attempt to create a new | |
179 | * connection structure for this node. | |
180 | */ | |
181 | static struct connection *__nodeid2con(int nodeid, gfp_t alloc) | |
fdda387f PC |
182 | { |
183 | struct connection *con = NULL; | |
6ed7257b | 184 | int r; |
fdda387f | 185 | |
5e9ccc37 | 186 | con = __find_con(nodeid); |
6ed7257b PC |
187 | if (con || !alloc) |
188 | return con; | |
fdda387f | 189 | |
6ed7257b PC |
190 | con = kmem_cache_zalloc(con_cache, alloc); |
191 | if (!con) | |
192 | return NULL; | |
fdda387f | 193 | |
5e9ccc37 CC |
194 | r = nodeid_hash(nodeid); |
195 | hlist_add_head(&con->list, &connection_hash[r]); | |
fdda387f | 196 | |
6ed7257b PC |
197 | con->nodeid = nodeid; |
198 | mutex_init(&con->sock_mutex); | |
199 | INIT_LIST_HEAD(&con->writequeue); | |
200 | spin_lock_init(&con->writequeue_lock); | |
201 | INIT_WORK(&con->swork, process_send_sockets); | |
202 | INIT_WORK(&con->rwork, process_recv_sockets); | |
fdda387f | 203 | |
6ed7257b PC |
204 | /* Setup action pointers for child sockets */ |
205 | if (con->nodeid) { | |
5e9ccc37 | 206 | struct connection *zerocon = __find_con(0); |
fdda387f | 207 | |
6ed7257b PC |
208 | con->connect_action = zerocon->connect_action; |
209 | if (!con->rx_action) | |
210 | con->rx_action = zerocon->rx_action; | |
fdda387f PC |
211 | } |
212 | ||
6ed7257b PC |
213 | return con; |
214 | } | |
215 | ||
5e9ccc37 CC |
216 | /* Loop round all connections */ |
217 | static void foreach_conn(void (*conn_func)(struct connection *c)) | |
218 | { | |
219 | int i; | |
220 | struct hlist_node *h, *n; | |
221 | struct connection *con; | |
222 | ||
223 | for (i = 0; i < CONN_HASH_SIZE; i++) { | |
224 | hlist_for_each_entry_safe(con, h, n, &connection_hash[i], list){ | |
225 | conn_func(con); | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
6ed7257b PC |
230 | static struct connection *nodeid2con(int nodeid, gfp_t allocation) |
231 | { | |
232 | struct connection *con; | |
233 | ||
7a936ce7 | 234 | mutex_lock(&connections_lock); |
6ed7257b | 235 | con = __nodeid2con(nodeid, allocation); |
7a936ce7 | 236 | mutex_unlock(&connections_lock); |
6ed7257b | 237 | |
fdda387f PC |
238 | return con; |
239 | } | |
240 | ||
6ed7257b PC |
241 | /* This is a bit drastic, but only called when things go wrong */ |
242 | static struct connection *assoc2con(int assoc_id) | |
243 | { | |
244 | int i; | |
5e9ccc37 | 245 | struct hlist_node *h; |
6ed7257b PC |
246 | struct connection *con; |
247 | ||
7a936ce7 | 248 | mutex_lock(&connections_lock); |
5e9ccc37 CC |
249 | |
250 | for (i = 0 ; i < CONN_HASH_SIZE; i++) { | |
251 | hlist_for_each_entry(con, h, &connection_hash[i], list) { | |
f70cb33b | 252 | if (con->sctp_assoc == assoc_id) { |
5e9ccc37 CC |
253 | mutex_unlock(&connections_lock); |
254 | return con; | |
255 | } | |
6ed7257b PC |
256 | } |
257 | } | |
7a936ce7 | 258 | mutex_unlock(&connections_lock); |
6ed7257b PC |
259 | return NULL; |
260 | } | |
261 | ||
262 | static int nodeid_to_addr(int nodeid, struct sockaddr *retaddr) | |
263 | { | |
264 | struct sockaddr_storage addr; | |
265 | int error; | |
266 | ||
267 | if (!dlm_local_count) | |
268 | return -1; | |
269 | ||
270 | error = dlm_nodeid_to_addr(nodeid, &addr); | |
271 | if (error) | |
272 | return error; | |
273 | ||
274 | if (dlm_local_addr[0]->ss_family == AF_INET) { | |
275 | struct sockaddr_in *in4 = (struct sockaddr_in *) &addr; | |
276 | struct sockaddr_in *ret4 = (struct sockaddr_in *) retaddr; | |
277 | ret4->sin_addr.s_addr = in4->sin_addr.s_addr; | |
278 | } else { | |
279 | struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) &addr; | |
280 | struct sockaddr_in6 *ret6 = (struct sockaddr_in6 *) retaddr; | |
44ad532b | 281 | ipv6_addr_copy(&ret6->sin6_addr, &in6->sin6_addr); |
6ed7257b PC |
282 | } |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
fdda387f PC |
287 | /* Data available on socket or listen socket received a connect */ |
288 | static void lowcomms_data_ready(struct sock *sk, int count_unused) | |
289 | { | |
290 | struct connection *con = sock2con(sk); | |
afb853fb | 291 | if (con && !test_and_set_bit(CF_READ_PENDING, &con->flags)) |
1d6e8131 | 292 | queue_work(recv_workqueue, &con->rwork); |
fdda387f PC |
293 | } |
294 | ||
295 | static void lowcomms_write_space(struct sock *sk) | |
296 | { | |
297 | struct connection *con = sock2con(sk); | |
298 | ||
b36930dd DM |
299 | if (!con) |
300 | return; | |
301 | ||
302 | clear_bit(SOCK_NOSPACE, &con->sock->flags); | |
303 | ||
304 | if (test_and_clear_bit(CF_APP_LIMITED, &con->flags)) { | |
305 | con->sock->sk->sk_write_pending--; | |
306 | clear_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags); | |
307 | } | |
308 | ||
309 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) | |
1d6e8131 | 310 | queue_work(send_workqueue, &con->swork); |
fdda387f PC |
311 | } |
312 | ||
313 | static inline void lowcomms_connect_sock(struct connection *con) | |
314 | { | |
063c4c99 LMB |
315 | if (test_bit(CF_CLOSE, &con->flags)) |
316 | return; | |
1d6e8131 PC |
317 | if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags)) |
318 | queue_work(send_workqueue, &con->swork); | |
fdda387f PC |
319 | } |
320 | ||
321 | static void lowcomms_state_change(struct sock *sk) | |
322 | { | |
ac33d071 | 323 | if (sk->sk_state == TCP_ESTABLISHED) |
fdda387f | 324 | lowcomms_write_space(sk); |
fdda387f PC |
325 | } |
326 | ||
391fbdc5 CC |
327 | int dlm_lowcomms_connect_node(int nodeid) |
328 | { | |
329 | struct connection *con; | |
330 | ||
04bedd79 DT |
331 | /* with sctp there's no connecting without sending */ |
332 | if (dlm_config.ci_protocol != 0) | |
333 | return 0; | |
334 | ||
391fbdc5 CC |
335 | if (nodeid == dlm_our_nodeid()) |
336 | return 0; | |
337 | ||
338 | con = nodeid2con(nodeid, GFP_NOFS); | |
339 | if (!con) | |
340 | return -ENOMEM; | |
341 | lowcomms_connect_sock(con); | |
342 | return 0; | |
343 | } | |
344 | ||
fdda387f PC |
345 | /* Make a socket active */ |
346 | static int add_sock(struct socket *sock, struct connection *con) | |
347 | { | |
348 | con->sock = sock; | |
349 | ||
350 | /* Install a data_ready callback */ | |
351 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
352 | con->sock->sk->sk_write_space = lowcomms_write_space; | |
353 | con->sock->sk->sk_state_change = lowcomms_state_change; | |
6ed7257b | 354 | con->sock->sk->sk_user_data = con; |
d6d7b702 | 355 | con->sock->sk->sk_allocation = GFP_NOFS; |
fdda387f PC |
356 | return 0; |
357 | } | |
358 | ||
6ed7257b | 359 | /* Add the port number to an IPv6 or 4 sockaddr and return the address |
fdda387f PC |
360 | length */ |
361 | static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port, | |
362 | int *addr_len) | |
363 | { | |
6ed7257b | 364 | saddr->ss_family = dlm_local_addr[0]->ss_family; |
ac33d071 | 365 | if (saddr->ss_family == AF_INET) { |
fdda387f PC |
366 | struct sockaddr_in *in4_addr = (struct sockaddr_in *)saddr; |
367 | in4_addr->sin_port = cpu_to_be16(port); | |
368 | *addr_len = sizeof(struct sockaddr_in); | |
6ed7257b | 369 | memset(&in4_addr->sin_zero, 0, sizeof(in4_addr->sin_zero)); |
ac33d071 | 370 | } else { |
fdda387f PC |
371 | struct sockaddr_in6 *in6_addr = (struct sockaddr_in6 *)saddr; |
372 | in6_addr->sin6_port = cpu_to_be16(port); | |
373 | *addr_len = sizeof(struct sockaddr_in6); | |
374 | } | |
01c8cab2 | 375 | memset((char *)saddr + *addr_len, 0, sizeof(struct sockaddr_storage) - *addr_len); |
fdda387f PC |
376 | } |
377 | ||
378 | /* Close a remote connection and tidy up */ | |
ac33d071 | 379 | static void close_connection(struct connection *con, bool and_other) |
fdda387f | 380 | { |
f1f1c1cc | 381 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
382 | |
383 | if (con->sock) { | |
384 | sock_release(con->sock); | |
385 | con->sock = NULL; | |
386 | } | |
387 | if (con->othercon && and_other) { | |
ac33d071 PC |
388 | /* Will only re-enter once. */ |
389 | close_connection(con->othercon, false); | |
fdda387f PC |
390 | } |
391 | if (con->rx_page) { | |
392 | __free_page(con->rx_page); | |
393 | con->rx_page = NULL; | |
394 | } | |
9e5f2825 | 395 | |
61d96be0 PC |
396 | con->retries = 0; |
397 | mutex_unlock(&con->sock_mutex); | |
fdda387f PC |
398 | } |
399 | ||
6ed7257b PC |
400 | /* We only send shutdown messages to nodes that are not part of the cluster */ |
401 | static void sctp_send_shutdown(sctp_assoc_t associd) | |
402 | { | |
403 | static char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; | |
404 | struct msghdr outmessage; | |
405 | struct cmsghdr *cmsg; | |
406 | struct sctp_sndrcvinfo *sinfo; | |
407 | int ret; | |
408 | struct connection *con; | |
409 | ||
410 | con = nodeid2con(0,0); | |
411 | BUG_ON(con == NULL); | |
412 | ||
413 | outmessage.msg_name = NULL; | |
414 | outmessage.msg_namelen = 0; | |
415 | outmessage.msg_control = outcmsg; | |
416 | outmessage.msg_controllen = sizeof(outcmsg); | |
417 | outmessage.msg_flags = MSG_EOR; | |
418 | ||
419 | cmsg = CMSG_FIRSTHDR(&outmessage); | |
420 | cmsg->cmsg_level = IPPROTO_SCTP; | |
421 | cmsg->cmsg_type = SCTP_SNDRCV; | |
422 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); | |
423 | outmessage.msg_controllen = cmsg->cmsg_len; | |
424 | sinfo = CMSG_DATA(cmsg); | |
425 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); | |
426 | ||
427 | sinfo->sinfo_flags |= MSG_EOF; | |
428 | sinfo->sinfo_assoc_id = associd; | |
429 | ||
430 | ret = kernel_sendmsg(con->sock, &outmessage, NULL, 0, 0); | |
431 | ||
432 | if (ret != 0) | |
433 | log_print("send EOF to node failed: %d", ret); | |
434 | } | |
435 | ||
5e9ccc37 CC |
436 | static void sctp_init_failed_foreach(struct connection *con) |
437 | { | |
438 | con->sctp_assoc = 0; | |
439 | if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { | |
440 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) | |
441 | queue_work(send_workqueue, &con->swork); | |
442 | } | |
443 | } | |
444 | ||
6ed7257b PC |
445 | /* INIT failed but we don't know which node... |
446 | restart INIT on all pending nodes */ | |
447 | static void sctp_init_failed(void) | |
448 | { | |
7a936ce7 | 449 | mutex_lock(&connections_lock); |
5e9ccc37 CC |
450 | |
451 | foreach_conn(sctp_init_failed_foreach); | |
452 | ||
7a936ce7 | 453 | mutex_unlock(&connections_lock); |
6ed7257b PC |
454 | } |
455 | ||
456 | /* Something happened to an association */ | |
617e82e1 DT |
457 | static void process_sctp_notification(struct connection *con, |
458 | struct msghdr *msg, char *buf) | |
6ed7257b PC |
459 | { |
460 | union sctp_notification *sn = (union sctp_notification *)buf; | |
461 | ||
462 | if (sn->sn_header.sn_type == SCTP_ASSOC_CHANGE) { | |
463 | switch (sn->sn_assoc_change.sac_state) { | |
464 | ||
465 | case SCTP_COMM_UP: | |
466 | case SCTP_RESTART: | |
467 | { | |
468 | /* Check that the new node is in the lockspace */ | |
469 | struct sctp_prim prim; | |
470 | int nodeid; | |
471 | int prim_len, ret; | |
472 | int addr_len; | |
473 | struct connection *new_con; | |
6ed7257b PC |
474 | sctp_peeloff_arg_t parg; |
475 | int parglen = sizeof(parg); | |
6861f350 | 476 | int err; |
6ed7257b PC |
477 | |
478 | /* | |
479 | * We get this before any data for an association. | |
480 | * We verify that the node is in the cluster and | |
481 | * then peel off a socket for it. | |
482 | */ | |
483 | if ((int)sn->sn_assoc_change.sac_assoc_id <= 0) { | |
484 | log_print("COMM_UP for invalid assoc ID %d", | |
617e82e1 | 485 | (int)sn->sn_assoc_change.sac_assoc_id); |
6ed7257b PC |
486 | sctp_init_failed(); |
487 | return; | |
488 | } | |
489 | memset(&prim, 0, sizeof(struct sctp_prim)); | |
490 | prim_len = sizeof(struct sctp_prim); | |
491 | prim.ssp_assoc_id = sn->sn_assoc_change.sac_assoc_id; | |
492 | ||
493 | ret = kernel_getsockopt(con->sock, | |
494 | IPPROTO_SCTP, | |
495 | SCTP_PRIMARY_ADDR, | |
496 | (char*)&prim, | |
497 | &prim_len); | |
498 | if (ret < 0) { | |
499 | log_print("getsockopt/sctp_primary_addr on " | |
500 | "new assoc %d failed : %d", | |
501 | (int)sn->sn_assoc_change.sac_assoc_id, | |
502 | ret); | |
503 | ||
504 | /* Retry INIT later */ | |
505 | new_con = assoc2con(sn->sn_assoc_change.sac_assoc_id); | |
506 | if (new_con) | |
507 | clear_bit(CF_CONNECT_PENDING, &con->flags); | |
508 | return; | |
509 | } | |
510 | make_sockaddr(&prim.ssp_addr, 0, &addr_len); | |
511 | if (dlm_addr_to_nodeid(&prim.ssp_addr, &nodeid)) { | |
512 | int i; | |
513 | unsigned char *b=(unsigned char *)&prim.ssp_addr; | |
514 | log_print("reject connect from unknown addr"); | |
515 | for (i=0; i<sizeof(struct sockaddr_storage);i++) | |
516 | printk("%02x ", b[i]); | |
517 | printk("\n"); | |
518 | sctp_send_shutdown(prim.ssp_assoc_id); | |
519 | return; | |
520 | } | |
521 | ||
748285cc | 522 | new_con = nodeid2con(nodeid, GFP_NOFS); |
6ed7257b PC |
523 | if (!new_con) |
524 | return; | |
525 | ||
526 | /* Peel off a new sock */ | |
527 | parg.associd = sn->sn_assoc_change.sac_assoc_id; | |
617e82e1 DT |
528 | ret = kernel_getsockopt(con->sock, IPPROTO_SCTP, |
529 | SCTP_SOCKOPT_PEELOFF, | |
6ed7257b | 530 | (void *)&parg, &parglen); |
6861f350 | 531 | if (ret < 0) { |
617e82e1 | 532 | log_print("Can't peel off a socket for " |
6861f350 | 533 | "connection %d to node %d: err=%d", |
6ed7257b | 534 | parg.associd, nodeid, ret); |
6861f350 DT |
535 | return; |
536 | } | |
537 | new_con->sock = sockfd_lookup(parg.sd, &err); | |
538 | if (!new_con->sock) { | |
539 | log_print("sockfd_lookup error %d", err); | |
540 | return; | |
6ed7257b | 541 | } |
6ed7257b | 542 | add_sock(new_con->sock, new_con); |
6861f350 | 543 | sockfd_put(new_con->sock); |
6ed7257b | 544 | |
6861f350 DT |
545 | log_print("connecting to %d sctp association %d", |
546 | nodeid, (int)sn->sn_assoc_change.sac_assoc_id); | |
6ed7257b PC |
547 | |
548 | /* Send any pending writes */ | |
549 | clear_bit(CF_CONNECT_PENDING, &new_con->flags); | |
550 | clear_bit(CF_INIT_PENDING, &con->flags); | |
551 | if (!test_and_set_bit(CF_WRITE_PENDING, &new_con->flags)) { | |
552 | queue_work(send_workqueue, &new_con->swork); | |
553 | } | |
554 | if (!test_and_set_bit(CF_READ_PENDING, &new_con->flags)) | |
555 | queue_work(recv_workqueue, &new_con->rwork); | |
556 | } | |
557 | break; | |
558 | ||
559 | case SCTP_COMM_LOST: | |
560 | case SCTP_SHUTDOWN_COMP: | |
561 | { | |
562 | con = assoc2con(sn->sn_assoc_change.sac_assoc_id); | |
563 | if (con) { | |
564 | con->sctp_assoc = 0; | |
565 | } | |
566 | } | |
567 | break; | |
568 | ||
569 | /* We don't know which INIT failed, so clear the PENDING flags | |
570 | * on them all. if assoc_id is zero then it will then try | |
571 | * again */ | |
572 | ||
573 | case SCTP_CANT_STR_ASSOC: | |
574 | { | |
575 | log_print("Can't start SCTP association - retrying"); | |
576 | sctp_init_failed(); | |
577 | } | |
578 | break; | |
579 | ||
580 | default: | |
581 | log_print("unexpected SCTP assoc change id=%d state=%d", | |
582 | (int)sn->sn_assoc_change.sac_assoc_id, | |
583 | sn->sn_assoc_change.sac_state); | |
584 | } | |
585 | } | |
586 | } | |
587 | ||
fdda387f PC |
588 | /* Data received from remote end */ |
589 | static int receive_from_sock(struct connection *con) | |
590 | { | |
591 | int ret = 0; | |
58addbff AV |
592 | struct msghdr msg = {}; |
593 | struct kvec iov[2]; | |
fdda387f PC |
594 | unsigned len; |
595 | int r; | |
596 | int call_again_soon = 0; | |
58addbff | 597 | int nvec; |
6ed7257b | 598 | char incmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; |
fdda387f | 599 | |
f1f1c1cc | 600 | mutex_lock(&con->sock_mutex); |
fdda387f | 601 | |
a34fbc63 PC |
602 | if (con->sock == NULL) { |
603 | ret = -EAGAIN; | |
604 | goto out_close; | |
605 | } | |
606 | ||
fdda387f PC |
607 | if (con->rx_page == NULL) { |
608 | /* | |
609 | * This doesn't need to be atomic, but I think it should | |
610 | * improve performance if it is. | |
611 | */ | |
612 | con->rx_page = alloc_page(GFP_ATOMIC); | |
613 | if (con->rx_page == NULL) | |
614 | goto out_resched; | |
ac33d071 | 615 | cbuf_init(&con->cb, PAGE_CACHE_SIZE); |
fdda387f PC |
616 | } |
617 | ||
6ed7257b PC |
618 | /* Only SCTP needs these really */ |
619 | memset(&incmsg, 0, sizeof(incmsg)); | |
620 | msg.msg_control = incmsg; | |
621 | msg.msg_controllen = sizeof(incmsg); | |
622 | ||
fdda387f PC |
623 | /* |
624 | * iov[0] is the bit of the circular buffer between the current end | |
625 | * point (cb.base + cb.len) and the end of the buffer. | |
626 | */ | |
ac33d071 PC |
627 | iov[0].iov_len = con->cb.base - cbuf_data(&con->cb); |
628 | iov[0].iov_base = page_address(con->rx_page) + cbuf_data(&con->cb); | |
89adc934 | 629 | iov[1].iov_len = 0; |
58addbff | 630 | nvec = 1; |
fdda387f PC |
631 | |
632 | /* | |
633 | * iov[1] is the bit of the circular buffer between the start of the | |
634 | * buffer and the start of the currently used section (cb.base) | |
635 | */ | |
ac33d071 PC |
636 | if (cbuf_data(&con->cb) >= con->cb.base) { |
637 | iov[0].iov_len = PAGE_CACHE_SIZE - cbuf_data(&con->cb); | |
fdda387f PC |
638 | iov[1].iov_len = con->cb.base; |
639 | iov[1].iov_base = page_address(con->rx_page); | |
58addbff | 640 | nvec = 2; |
fdda387f PC |
641 | } |
642 | len = iov[0].iov_len + iov[1].iov_len; | |
643 | ||
58addbff | 644 | r = ret = kernel_recvmsg(con->sock, &msg, iov, nvec, len, |
fdda387f | 645 | MSG_DONTWAIT | MSG_NOSIGNAL); |
fdda387f PC |
646 | if (ret <= 0) |
647 | goto out_close; | |
bd44e2b0 | 648 | |
6ed7257b PC |
649 | /* Process SCTP notifications */ |
650 | if (msg.msg_flags & MSG_NOTIFICATION) { | |
6ed7257b PC |
651 | msg.msg_control = incmsg; |
652 | msg.msg_controllen = sizeof(incmsg); | |
653 | ||
654 | process_sctp_notification(con, &msg, | |
617e82e1 | 655 | page_address(con->rx_page) + con->cb.base); |
6ed7257b PC |
656 | mutex_unlock(&con->sock_mutex); |
657 | return 0; | |
658 | } | |
659 | BUG_ON(con->nodeid == 0); | |
660 | ||
fdda387f PC |
661 | if (ret == len) |
662 | call_again_soon = 1; | |
ac33d071 | 663 | cbuf_add(&con->cb, ret); |
fdda387f PC |
664 | ret = dlm_process_incoming_buffer(con->nodeid, |
665 | page_address(con->rx_page), | |
666 | con->cb.base, con->cb.len, | |
667 | PAGE_CACHE_SIZE); | |
668 | if (ret == -EBADMSG) { | |
617e82e1 DT |
669 | log_print("lowcomms: addr=%p, base=%u, len=%u, " |
670 | "iov_len=%u, iov_base[0]=%p, read=%d", | |
671 | page_address(con->rx_page), con->cb.base, con->cb.len, | |
672 | len, iov[0].iov_base, r); | |
fdda387f PC |
673 | } |
674 | if (ret < 0) | |
675 | goto out_close; | |
ac33d071 | 676 | cbuf_eat(&con->cb, ret); |
fdda387f | 677 | |
ac33d071 | 678 | if (cbuf_empty(&con->cb) && !call_again_soon) { |
fdda387f PC |
679 | __free_page(con->rx_page); |
680 | con->rx_page = NULL; | |
681 | } | |
682 | ||
fdda387f PC |
683 | if (call_again_soon) |
684 | goto out_resched; | |
f1f1c1cc | 685 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 686 | return 0; |
fdda387f | 687 | |
ac33d071 | 688 | out_resched: |
1d6e8131 PC |
689 | if (!test_and_set_bit(CF_READ_PENDING, &con->flags)) |
690 | queue_work(recv_workqueue, &con->rwork); | |
f1f1c1cc | 691 | mutex_unlock(&con->sock_mutex); |
bd44e2b0 | 692 | return -EAGAIN; |
fdda387f | 693 | |
ac33d071 | 694 | out_close: |
f1f1c1cc | 695 | mutex_unlock(&con->sock_mutex); |
9e5f2825 | 696 | if (ret != -EAGAIN) { |
ac33d071 | 697 | close_connection(con, false); |
fdda387f PC |
698 | /* Reconnect when there is something to send */ |
699 | } | |
a34fbc63 PC |
700 | /* Don't return success if we really got EOF */ |
701 | if (ret == 0) | |
702 | ret = -EAGAIN; | |
fdda387f | 703 | |
fdda387f PC |
704 | return ret; |
705 | } | |
706 | ||
707 | /* Listening socket is busy, accept a connection */ | |
6ed7257b | 708 | static int tcp_accept_from_sock(struct connection *con) |
fdda387f PC |
709 | { |
710 | int result; | |
711 | struct sockaddr_storage peeraddr; | |
712 | struct socket *newsock; | |
713 | int len; | |
714 | int nodeid; | |
715 | struct connection *newcon; | |
bd44e2b0 | 716 | struct connection *addcon; |
fdda387f PC |
717 | |
718 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
6ed7257b | 719 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d071 | 720 | IPPROTO_TCP, &newsock); |
fdda387f PC |
721 | if (result < 0) |
722 | return -ENOMEM; | |
723 | ||
f1f1c1cc | 724 | mutex_lock_nested(&con->sock_mutex, 0); |
fdda387f PC |
725 | |
726 | result = -ENOTCONN; | |
727 | if (con->sock == NULL) | |
728 | goto accept_err; | |
729 | ||
730 | newsock->type = con->sock->type; | |
731 | newsock->ops = con->sock->ops; | |
732 | ||
733 | result = con->sock->ops->accept(con->sock, newsock, O_NONBLOCK); | |
734 | if (result < 0) | |
735 | goto accept_err; | |
736 | ||
737 | /* Get the connected socket's peer */ | |
738 | memset(&peeraddr, 0, sizeof(peeraddr)); | |
739 | if (newsock->ops->getname(newsock, (struct sockaddr *)&peeraddr, | |
740 | &len, 2)) { | |
741 | result = -ECONNABORTED; | |
742 | goto accept_err; | |
743 | } | |
744 | ||
745 | /* Get the new node's NODEID */ | |
746 | make_sockaddr(&peeraddr, 0, &len); | |
747 | if (dlm_addr_to_nodeid(&peeraddr, &nodeid)) { | |
617e82e1 | 748 | log_print("connect from non cluster node"); |
fdda387f | 749 | sock_release(newsock); |
f1f1c1cc | 750 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
751 | return -1; |
752 | } | |
753 | ||
754 | log_print("got connection from %d", nodeid); | |
755 | ||
756 | /* Check to see if we already have a connection to this node. This | |
757 | * could happen if the two nodes initiate a connection at roughly | |
758 | * the same time and the connections cross on the wire. | |
fdda387f PC |
759 | * In this case we store the incoming one in "othercon" |
760 | */ | |
748285cc | 761 | newcon = nodeid2con(nodeid, GFP_NOFS); |
fdda387f PC |
762 | if (!newcon) { |
763 | result = -ENOMEM; | |
764 | goto accept_err; | |
765 | } | |
f1f1c1cc | 766 | mutex_lock_nested(&newcon->sock_mutex, 1); |
fdda387f | 767 | if (newcon->sock) { |
ac33d071 | 768 | struct connection *othercon = newcon->othercon; |
fdda387f PC |
769 | |
770 | if (!othercon) { | |
748285cc | 771 | othercon = kmem_cache_zalloc(con_cache, GFP_NOFS); |
fdda387f | 772 | if (!othercon) { |
617e82e1 | 773 | log_print("failed to allocate incoming socket"); |
f1f1c1cc | 774 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
775 | result = -ENOMEM; |
776 | goto accept_err; | |
777 | } | |
fdda387f PC |
778 | othercon->nodeid = nodeid; |
779 | othercon->rx_action = receive_from_sock; | |
f1f1c1cc | 780 | mutex_init(&othercon->sock_mutex); |
1d6e8131 PC |
781 | INIT_WORK(&othercon->swork, process_send_sockets); |
782 | INIT_WORK(&othercon->rwork, process_recv_sockets); | |
fdda387f | 783 | set_bit(CF_IS_OTHERCON, &othercon->flags); |
61d96be0 PC |
784 | } |
785 | if (!othercon->sock) { | |
fdda387f | 786 | newcon->othercon = othercon; |
97d84836 PC |
787 | othercon->sock = newsock; |
788 | newsock->sk->sk_user_data = othercon; | |
789 | add_sock(newsock, othercon); | |
790 | addcon = othercon; | |
791 | } | |
792 | else { | |
793 | printk("Extra connection from node %d attempted\n", nodeid); | |
794 | result = -EAGAIN; | |
f4fadb23 | 795 | mutex_unlock(&newcon->sock_mutex); |
97d84836 | 796 | goto accept_err; |
fdda387f | 797 | } |
fdda387f PC |
798 | } |
799 | else { | |
800 | newsock->sk->sk_user_data = newcon; | |
801 | newcon->rx_action = receive_from_sock; | |
802 | add_sock(newsock, newcon); | |
bd44e2b0 | 803 | addcon = newcon; |
fdda387f PC |
804 | } |
805 | ||
f1f1c1cc | 806 | mutex_unlock(&newcon->sock_mutex); |
fdda387f PC |
807 | |
808 | /* | |
809 | * Add it to the active queue in case we got data | |
810 | * beween processing the accept adding the socket | |
811 | * to the read_sockets list | |
812 | */ | |
bd44e2b0 PC |
813 | if (!test_and_set_bit(CF_READ_PENDING, &addcon->flags)) |
814 | queue_work(recv_workqueue, &addcon->rwork); | |
f1f1c1cc | 815 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
816 | |
817 | return 0; | |
818 | ||
ac33d071 | 819 | accept_err: |
f1f1c1cc | 820 | mutex_unlock(&con->sock_mutex); |
fdda387f PC |
821 | sock_release(newsock); |
822 | ||
823 | if (result != -EAGAIN) | |
617e82e1 | 824 | log_print("error accepting connection from node: %d", result); |
fdda387f PC |
825 | return result; |
826 | } | |
827 | ||
6ed7257b PC |
828 | static void free_entry(struct writequeue_entry *e) |
829 | { | |
830 | __free_page(e->page); | |
831 | kfree(e); | |
832 | } | |
833 | ||
834 | /* Initiate an SCTP association. | |
835 | This is a special case of send_to_sock() in that we don't yet have a | |
836 | peeled-off socket for this association, so we use the listening socket | |
837 | and add the primary IP address of the remote node. | |
838 | */ | |
839 | static void sctp_init_assoc(struct connection *con) | |
840 | { | |
841 | struct sockaddr_storage rem_addr; | |
842 | char outcmsg[CMSG_SPACE(sizeof(struct sctp_sndrcvinfo))]; | |
843 | struct msghdr outmessage; | |
844 | struct cmsghdr *cmsg; | |
845 | struct sctp_sndrcvinfo *sinfo; | |
846 | struct connection *base_con; | |
847 | struct writequeue_entry *e; | |
848 | int len, offset; | |
849 | int ret; | |
850 | int addrlen; | |
851 | struct kvec iov[1]; | |
852 | ||
853 | if (test_and_set_bit(CF_INIT_PENDING, &con->flags)) | |
854 | return; | |
855 | ||
856 | if (con->retries++ > MAX_CONNECT_RETRIES) | |
857 | return; | |
858 | ||
6ed7257b PC |
859 | if (nodeid_to_addr(con->nodeid, (struct sockaddr *)&rem_addr)) { |
860 | log_print("no address for nodeid %d", con->nodeid); | |
861 | return; | |
862 | } | |
863 | base_con = nodeid2con(0, 0); | |
864 | BUG_ON(base_con == NULL); | |
865 | ||
866 | make_sockaddr(&rem_addr, dlm_config.ci_tcp_port, &addrlen); | |
867 | ||
868 | outmessage.msg_name = &rem_addr; | |
869 | outmessage.msg_namelen = addrlen; | |
870 | outmessage.msg_control = outcmsg; | |
871 | outmessage.msg_controllen = sizeof(outcmsg); | |
872 | outmessage.msg_flags = MSG_EOR; | |
873 | ||
874 | spin_lock(&con->writequeue_lock); | |
6ed7257b | 875 | |
04bedd79 DT |
876 | if (list_empty(&con->writequeue)) { |
877 | spin_unlock(&con->writequeue_lock); | |
878 | log_print("writequeue empty for nodeid %d", con->nodeid); | |
879 | return; | |
880 | } | |
6ed7257b | 881 | |
04bedd79 | 882 | e = list_first_entry(&con->writequeue, struct writequeue_entry, list); |
6ed7257b PC |
883 | len = e->len; |
884 | offset = e->offset; | |
885 | spin_unlock(&con->writequeue_lock); | |
6ed7257b PC |
886 | |
887 | /* Send the first block off the write queue */ | |
888 | iov[0].iov_base = page_address(e->page)+offset; | |
889 | iov[0].iov_len = len; | |
890 | ||
891 | cmsg = CMSG_FIRSTHDR(&outmessage); | |
892 | cmsg->cmsg_level = IPPROTO_SCTP; | |
893 | cmsg->cmsg_type = SCTP_SNDRCV; | |
894 | cmsg->cmsg_len = CMSG_LEN(sizeof(struct sctp_sndrcvinfo)); | |
895 | sinfo = CMSG_DATA(cmsg); | |
896 | memset(sinfo, 0x00, sizeof(struct sctp_sndrcvinfo)); | |
897 | sinfo->sinfo_ppid = cpu_to_le32(dlm_our_nodeid()); | |
898 | outmessage.msg_controllen = cmsg->cmsg_len; | |
899 | ||
900 | ret = kernel_sendmsg(base_con->sock, &outmessage, iov, 1, len); | |
901 | if (ret < 0) { | |
617e82e1 DT |
902 | log_print("Send first packet to node %d failed: %d", |
903 | con->nodeid, ret); | |
6ed7257b PC |
904 | |
905 | /* Try again later */ | |
906 | clear_bit(CF_CONNECT_PENDING, &con->flags); | |
907 | clear_bit(CF_INIT_PENDING, &con->flags); | |
908 | } | |
909 | else { | |
910 | spin_lock(&con->writequeue_lock); | |
911 | e->offset += ret; | |
912 | e->len -= ret; | |
913 | ||
914 | if (e->len == 0 && e->users == 0) { | |
915 | list_del(&e->list); | |
6ed7257b PC |
916 | free_entry(e); |
917 | } | |
918 | spin_unlock(&con->writequeue_lock); | |
919 | } | |
920 | } | |
921 | ||
fdda387f | 922 | /* Connect a new socket to its peer */ |
6ed7257b | 923 | static void tcp_connect_to_sock(struct connection *con) |
fdda387f PC |
924 | { |
925 | int result = -EHOSTUNREACH; | |
6bd8feda | 926 | struct sockaddr_storage saddr, src_addr; |
fdda387f | 927 | int addr_len; |
a89d63a1 | 928 | struct socket *sock = NULL; |
cb2d45da | 929 | int one = 1; |
fdda387f PC |
930 | |
931 | if (con->nodeid == 0) { | |
932 | log_print("attempt to connect sock 0 foiled"); | |
ac33d071 | 933 | return; |
fdda387f PC |
934 | } |
935 | ||
f1f1c1cc | 936 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
937 | if (con->retries++ > MAX_CONNECT_RETRIES) |
938 | goto out; | |
939 | ||
940 | /* Some odd races can cause double-connects, ignore them */ | |
941 | if (con->sock) { | |
942 | result = 0; | |
943 | goto out; | |
944 | } | |
945 | ||
946 | /* Create a socket to communicate with */ | |
6ed7257b | 947 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
ac33d071 | 948 | IPPROTO_TCP, &sock); |
fdda387f PC |
949 | if (result < 0) |
950 | goto out_err; | |
951 | ||
952 | memset(&saddr, 0, sizeof(saddr)); | |
b5711b8e | 953 | if (dlm_nodeid_to_addr(con->nodeid, &saddr)) |
ac33d071 | 954 | goto out_err; |
fdda387f PC |
955 | |
956 | sock->sk->sk_user_data = con; | |
957 | con->rx_action = receive_from_sock; | |
6ed7257b PC |
958 | con->connect_action = tcp_connect_to_sock; |
959 | add_sock(sock, con); | |
fdda387f | 960 | |
6bd8feda LH |
961 | /* Bind to our cluster-known address connecting to avoid |
962 | routing problems */ | |
963 | memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr)); | |
964 | make_sockaddr(&src_addr, 0, &addr_len); | |
965 | result = sock->ops->bind(sock, (struct sockaddr *) &src_addr, | |
966 | addr_len); | |
967 | if (result < 0) { | |
968 | log_print("could not bind for connect: %d", result); | |
969 | /* This *may* not indicate a critical error */ | |
970 | } | |
971 | ||
68c817a1 | 972 | make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f | 973 | |
fdda387f | 974 | log_print("connecting to %d", con->nodeid); |
cb2d45da DT |
975 | |
976 | /* Turn off Nagle's algorithm */ | |
977 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
978 | sizeof(one)); | |
979 | ||
fdda387f PC |
980 | result = |
981 | sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len, | |
ac33d071 | 982 | O_NONBLOCK); |
fdda387f PC |
983 | if (result == -EINPROGRESS) |
984 | result = 0; | |
ac33d071 PC |
985 | if (result == 0) |
986 | goto out; | |
fdda387f | 987 | |
ac33d071 | 988 | out_err: |
fdda387f PC |
989 | if (con->sock) { |
990 | sock_release(con->sock); | |
991 | con->sock = NULL; | |
a89d63a1 CD |
992 | } else if (sock) { |
993 | sock_release(sock); | |
fdda387f PC |
994 | } |
995 | /* | |
996 | * Some errors are fatal and this list might need adjusting. For other | |
997 | * errors we try again until the max number of retries is reached. | |
998 | */ | |
999 | if (result != -EHOSTUNREACH && result != -ENETUNREACH && | |
0035a4b1 | 1000 | result != -ENETDOWN && result != -EINVAL |
fdda387f PC |
1001 | && result != -EPROTONOSUPPORT) { |
1002 | lowcomms_connect_sock(con); | |
1003 | result = 0; | |
1004 | } | |
ac33d071 | 1005 | out: |
f1f1c1cc | 1006 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1007 | return; |
fdda387f PC |
1008 | } |
1009 | ||
6ed7257b PC |
1010 | static struct socket *tcp_create_listen_sock(struct connection *con, |
1011 | struct sockaddr_storage *saddr) | |
fdda387f | 1012 | { |
ac33d071 | 1013 | struct socket *sock = NULL; |
fdda387f PC |
1014 | int result = 0; |
1015 | int one = 1; | |
1016 | int addr_len; | |
1017 | ||
6ed7257b | 1018 | if (dlm_local_addr[0]->ss_family == AF_INET) |
fdda387f PC |
1019 | addr_len = sizeof(struct sockaddr_in); |
1020 | else | |
1021 | addr_len = sizeof(struct sockaddr_in6); | |
1022 | ||
1023 | /* Create a socket to communicate with */ | |
617e82e1 DT |
1024 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_STREAM, |
1025 | IPPROTO_TCP, &sock); | |
fdda387f | 1026 | if (result < 0) { |
617e82e1 | 1027 | log_print("Can't create listening comms socket"); |
fdda387f PC |
1028 | goto create_out; |
1029 | } | |
1030 | ||
cb2d45da DT |
1031 | /* Turn off Nagle's algorithm */ |
1032 | kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&one, | |
1033 | sizeof(one)); | |
1034 | ||
6ed7257b PC |
1035 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, |
1036 | (char *)&one, sizeof(one)); | |
1037 | ||
fdda387f | 1038 | if (result < 0) { |
617e82e1 | 1039 | log_print("Failed to set SO_REUSEADDR on socket: %d", result); |
fdda387f PC |
1040 | } |
1041 | sock->sk->sk_user_data = con; | |
6ed7257b PC |
1042 | con->rx_action = tcp_accept_from_sock; |
1043 | con->connect_action = tcp_connect_to_sock; | |
fdda387f PC |
1044 | con->sock = sock; |
1045 | ||
1046 | /* Bind to our port */ | |
68c817a1 | 1047 | make_sockaddr(saddr, dlm_config.ci_tcp_port, &addr_len); |
fdda387f PC |
1048 | result = sock->ops->bind(sock, (struct sockaddr *) saddr, addr_len); |
1049 | if (result < 0) { | |
617e82e1 | 1050 | log_print("Can't bind to port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1051 | sock_release(sock); |
1052 | sock = NULL; | |
1053 | con->sock = NULL; | |
1054 | goto create_out; | |
1055 | } | |
6ed7257b | 1056 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, |
ac33d071 | 1057 | (char *)&one, sizeof(one)); |
fdda387f | 1058 | if (result < 0) { |
617e82e1 | 1059 | log_print("Set keepalive failed: %d", result); |
fdda387f PC |
1060 | } |
1061 | ||
1062 | result = sock->ops->listen(sock, 5); | |
1063 | if (result < 0) { | |
617e82e1 | 1064 | log_print("Can't listen on port %d", dlm_config.ci_tcp_port); |
fdda387f PC |
1065 | sock_release(sock); |
1066 | sock = NULL; | |
1067 | goto create_out; | |
1068 | } | |
1069 | ||
ac33d071 | 1070 | create_out: |
fdda387f PC |
1071 | return sock; |
1072 | } | |
1073 | ||
6ed7257b PC |
1074 | /* Get local addresses */ |
1075 | static void init_local(void) | |
1076 | { | |
1077 | struct sockaddr_storage sas, *addr; | |
1078 | int i; | |
1079 | ||
30d3a237 | 1080 | dlm_local_count = 0; |
6ed7257b PC |
1081 | for (i = 0; i < DLM_MAX_ADDR_COUNT - 1; i++) { |
1082 | if (dlm_our_addr(&sas, i)) | |
1083 | break; | |
1084 | ||
573c24c4 | 1085 | addr = kmalloc(sizeof(*addr), GFP_NOFS); |
6ed7257b PC |
1086 | if (!addr) |
1087 | break; | |
1088 | memcpy(addr, &sas, sizeof(*addr)); | |
1089 | dlm_local_addr[dlm_local_count++] = addr; | |
1090 | } | |
1091 | } | |
1092 | ||
617e82e1 DT |
1093 | /* Bind to an IP address. SCTP allows multiple address so it can do |
1094 | multi-homing */ | |
1095 | static int add_sctp_bind_addr(struct connection *sctp_con, | |
1096 | struct sockaddr_storage *addr, | |
1097 | int addr_len, int num) | |
6ed7257b PC |
1098 | { |
1099 | int result = 0; | |
1100 | ||
1101 | if (num == 1) | |
1102 | result = kernel_bind(sctp_con->sock, | |
1103 | (struct sockaddr *) addr, | |
1104 | addr_len); | |
1105 | else | |
1106 | result = kernel_setsockopt(sctp_con->sock, SOL_SCTP, | |
1107 | SCTP_SOCKOPT_BINDX_ADD, | |
1108 | (char *)addr, addr_len); | |
1109 | ||
1110 | if (result < 0) | |
1111 | log_print("Can't bind to port %d addr number %d", | |
1112 | dlm_config.ci_tcp_port, num); | |
1113 | ||
1114 | return result; | |
1115 | } | |
fdda387f | 1116 | |
6ed7257b PC |
1117 | /* Initialise SCTP socket and bind to all interfaces */ |
1118 | static int sctp_listen_for_all(void) | |
1119 | { | |
1120 | struct socket *sock = NULL; | |
1121 | struct sockaddr_storage localaddr; | |
1122 | struct sctp_event_subscribe subscribe; | |
1123 | int result = -EINVAL, num = 1, i, addr_len; | |
573c24c4 | 1124 | struct connection *con = nodeid2con(0, GFP_NOFS); |
6ed7257b PC |
1125 | int bufsize = NEEDED_RMEM; |
1126 | ||
1127 | if (!con) | |
1128 | return -ENOMEM; | |
1129 | ||
1130 | log_print("Using SCTP for communications"); | |
1131 | ||
1132 | result = sock_create_kern(dlm_local_addr[0]->ss_family, SOCK_SEQPACKET, | |
1133 | IPPROTO_SCTP, &sock); | |
1134 | if (result < 0) { | |
1135 | log_print("Can't create comms socket, check SCTP is loaded"); | |
1136 | goto out; | |
1137 | } | |
1138 | ||
1139 | /* Listen for events */ | |
1140 | memset(&subscribe, 0, sizeof(subscribe)); | |
1141 | subscribe.sctp_data_io_event = 1; | |
1142 | subscribe.sctp_association_event = 1; | |
1143 | subscribe.sctp_send_failure_event = 1; | |
1144 | subscribe.sctp_shutdown_event = 1; | |
1145 | subscribe.sctp_partial_delivery_event = 1; | |
1146 | ||
df61c952 | 1147 | result = kernel_setsockopt(sock, SOL_SOCKET, SO_RCVBUFFORCE, |
6ed7257b PC |
1148 | (char *)&bufsize, sizeof(bufsize)); |
1149 | if (result) | |
617e82e1 | 1150 | log_print("Error increasing buffer space on socket %d", result); |
6ed7257b PC |
1151 | |
1152 | result = kernel_setsockopt(sock, SOL_SCTP, SCTP_EVENTS, | |
617e82e1 | 1153 | (char *)&subscribe, sizeof(subscribe)); |
6ed7257b PC |
1154 | if (result < 0) { |
1155 | log_print("Failed to set SCTP_EVENTS on socket: result=%d", | |
1156 | result); | |
1157 | goto create_delsock; | |
1158 | } | |
1159 | ||
1160 | /* Init con struct */ | |
1161 | sock->sk->sk_user_data = con; | |
1162 | con->sock = sock; | |
1163 | con->sock->sk->sk_data_ready = lowcomms_data_ready; | |
1164 | con->rx_action = receive_from_sock; | |
1165 | con->connect_action = sctp_init_assoc; | |
1166 | ||
1167 | /* Bind to all interfaces. */ | |
1168 | for (i = 0; i < dlm_local_count; i++) { | |
1169 | memcpy(&localaddr, dlm_local_addr[i], sizeof(localaddr)); | |
1170 | make_sockaddr(&localaddr, dlm_config.ci_tcp_port, &addr_len); | |
1171 | ||
1172 | result = add_sctp_bind_addr(con, &localaddr, addr_len, num); | |
1173 | if (result) | |
1174 | goto create_delsock; | |
1175 | ++num; | |
1176 | } | |
1177 | ||
1178 | result = sock->ops->listen(sock, 5); | |
1179 | if (result < 0) { | |
1180 | log_print("Can't set socket listening"); | |
1181 | goto create_delsock; | |
1182 | } | |
1183 | ||
1184 | return 0; | |
1185 | ||
1186 | create_delsock: | |
1187 | sock_release(sock); | |
1188 | con->sock = NULL; | |
1189 | out: | |
1190 | return result; | |
1191 | } | |
1192 | ||
1193 | static int tcp_listen_for_all(void) | |
fdda387f PC |
1194 | { |
1195 | struct socket *sock = NULL; | |
573c24c4 | 1196 | struct connection *con = nodeid2con(0, GFP_NOFS); |
fdda387f PC |
1197 | int result = -EINVAL; |
1198 | ||
6ed7257b PC |
1199 | if (!con) |
1200 | return -ENOMEM; | |
1201 | ||
fdda387f | 1202 | /* We don't support multi-homed hosts */ |
6ed7257b | 1203 | if (dlm_local_addr[1] != NULL) { |
617e82e1 DT |
1204 | log_print("TCP protocol can't handle multi-homed hosts, " |
1205 | "try SCTP"); | |
6ed7257b PC |
1206 | return -EINVAL; |
1207 | } | |
1208 | ||
1209 | log_print("Using TCP for communications"); | |
1210 | ||
6ed7257b | 1211 | sock = tcp_create_listen_sock(con, dlm_local_addr[0]); |
fdda387f PC |
1212 | if (sock) { |
1213 | add_sock(sock, con); | |
1214 | result = 0; | |
1215 | } | |
1216 | else { | |
1217 | result = -EADDRINUSE; | |
1218 | } | |
1219 | ||
1220 | return result; | |
1221 | } | |
1222 | ||
1223 | ||
1224 | ||
1225 | static struct writequeue_entry *new_writequeue_entry(struct connection *con, | |
1226 | gfp_t allocation) | |
1227 | { | |
1228 | struct writequeue_entry *entry; | |
1229 | ||
1230 | entry = kmalloc(sizeof(struct writequeue_entry), allocation); | |
1231 | if (!entry) | |
1232 | return NULL; | |
1233 | ||
1234 | entry->page = alloc_page(allocation); | |
1235 | if (!entry->page) { | |
1236 | kfree(entry); | |
1237 | return NULL; | |
1238 | } | |
1239 | ||
1240 | entry->offset = 0; | |
1241 | entry->len = 0; | |
1242 | entry->end = 0; | |
1243 | entry->users = 0; | |
1244 | entry->con = con; | |
1245 | ||
1246 | return entry; | |
1247 | } | |
1248 | ||
617e82e1 | 1249 | void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) |
fdda387f PC |
1250 | { |
1251 | struct connection *con; | |
1252 | struct writequeue_entry *e; | |
1253 | int offset = 0; | |
1254 | int users = 0; | |
1255 | ||
fdda387f PC |
1256 | con = nodeid2con(nodeid, allocation); |
1257 | if (!con) | |
1258 | return NULL; | |
1259 | ||
4edde74e | 1260 | spin_lock(&con->writequeue_lock); |
fdda387f | 1261 | e = list_entry(con->writequeue.prev, struct writequeue_entry, list); |
ac33d071 | 1262 | if ((&e->list == &con->writequeue) || |
fdda387f PC |
1263 | (PAGE_CACHE_SIZE - e->end < len)) { |
1264 | e = NULL; | |
1265 | } else { | |
1266 | offset = e->end; | |
1267 | e->end += len; | |
1268 | users = e->users++; | |
1269 | } | |
1270 | spin_unlock(&con->writequeue_lock); | |
1271 | ||
1272 | if (e) { | |
ac33d071 | 1273 | got_one: |
fdda387f PC |
1274 | *ppc = page_address(e->page) + offset; |
1275 | return e; | |
1276 | } | |
1277 | ||
1278 | e = new_writequeue_entry(con, allocation); | |
1279 | if (e) { | |
1280 | spin_lock(&con->writequeue_lock); | |
1281 | offset = e->end; | |
1282 | e->end += len; | |
1283 | users = e->users++; | |
1284 | list_add_tail(&e->list, &con->writequeue); | |
1285 | spin_unlock(&con->writequeue_lock); | |
1286 | goto got_one; | |
1287 | } | |
1288 | return NULL; | |
1289 | } | |
1290 | ||
1291 | void dlm_lowcomms_commit_buffer(void *mh) | |
1292 | { | |
1293 | struct writequeue_entry *e = (struct writequeue_entry *)mh; | |
1294 | struct connection *con = e->con; | |
1295 | int users; | |
1296 | ||
4edde74e | 1297 | spin_lock(&con->writequeue_lock); |
fdda387f PC |
1298 | users = --e->users; |
1299 | if (users) | |
1300 | goto out; | |
1301 | e->len = e->end - e->offset; | |
fdda387f PC |
1302 | spin_unlock(&con->writequeue_lock); |
1303 | ||
1d6e8131 PC |
1304 | if (!test_and_set_bit(CF_WRITE_PENDING, &con->flags)) { |
1305 | queue_work(send_workqueue, &con->swork); | |
fdda387f PC |
1306 | } |
1307 | return; | |
1308 | ||
ac33d071 | 1309 | out: |
fdda387f PC |
1310 | spin_unlock(&con->writequeue_lock); |
1311 | return; | |
1312 | } | |
1313 | ||
fdda387f | 1314 | /* Send a message */ |
ac33d071 | 1315 | static void send_to_sock(struct connection *con) |
fdda387f PC |
1316 | { |
1317 | int ret = 0; | |
fdda387f PC |
1318 | const int msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL; |
1319 | struct writequeue_entry *e; | |
1320 | int len, offset; | |
1321 | ||
f1f1c1cc | 1322 | mutex_lock(&con->sock_mutex); |
fdda387f PC |
1323 | if (con->sock == NULL) |
1324 | goto out_connect; | |
1325 | ||
fdda387f PC |
1326 | spin_lock(&con->writequeue_lock); |
1327 | for (;;) { | |
1328 | e = list_entry(con->writequeue.next, struct writequeue_entry, | |
1329 | list); | |
1330 | if ((struct list_head *) e == &con->writequeue) | |
1331 | break; | |
1332 | ||
1333 | len = e->len; | |
1334 | offset = e->offset; | |
1335 | BUG_ON(len == 0 && e->users == 0); | |
1336 | spin_unlock(&con->writequeue_lock); | |
1337 | ||
1338 | ret = 0; | |
1339 | if (len) { | |
1329e3f2 PB |
1340 | ret = kernel_sendpage(con->sock, e->page, offset, len, |
1341 | msg_flags); | |
d66f8277 | 1342 | if (ret == -EAGAIN || ret == 0) { |
b36930dd DM |
1343 | if (ret == -EAGAIN && |
1344 | test_bit(SOCK_ASYNC_NOSPACE, &con->sock->flags) && | |
1345 | !test_and_set_bit(CF_APP_LIMITED, &con->flags)) { | |
1346 | /* Notify TCP that we're limited by the | |
1347 | * application window size. | |
1348 | */ | |
1349 | set_bit(SOCK_NOSPACE, &con->sock->flags); | |
1350 | con->sock->sk->sk_write_pending++; | |
1351 | } | |
d66f8277 | 1352 | cond_resched(); |
fdda387f | 1353 | goto out; |
d66f8277 | 1354 | } |
fdda387f PC |
1355 | if (ret <= 0) |
1356 | goto send_error; | |
d66f8277 | 1357 | } |
fdda387f | 1358 | /* Don't starve people filling buffers */ |
ac33d071 | 1359 | cond_resched(); |
fdda387f PC |
1360 | |
1361 | spin_lock(&con->writequeue_lock); | |
1362 | e->offset += ret; | |
1363 | e->len -= ret; | |
1364 | ||
1365 | if (e->len == 0 && e->users == 0) { | |
1366 | list_del(&e->list); | |
1367 | free_entry(e); | |
1368 | continue; | |
1369 | } | |
1370 | } | |
1371 | spin_unlock(&con->writequeue_lock); | |
ac33d071 | 1372 | out: |
f1f1c1cc | 1373 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1374 | return; |
fdda387f | 1375 | |
ac33d071 | 1376 | send_error: |
f1f1c1cc | 1377 | mutex_unlock(&con->sock_mutex); |
ac33d071 | 1378 | close_connection(con, false); |
fdda387f | 1379 | lowcomms_connect_sock(con); |
ac33d071 | 1380 | return; |
fdda387f | 1381 | |
ac33d071 | 1382 | out_connect: |
f1f1c1cc | 1383 | mutex_unlock(&con->sock_mutex); |
6ed7257b PC |
1384 | if (!test_bit(CF_INIT_PENDING, &con->flags)) |
1385 | lowcomms_connect_sock(con); | |
ac33d071 | 1386 | return; |
fdda387f PC |
1387 | } |
1388 | ||
1389 | static void clean_one_writequeue(struct connection *con) | |
1390 | { | |
5e9ccc37 | 1391 | struct writequeue_entry *e, *safe; |
fdda387f PC |
1392 | |
1393 | spin_lock(&con->writequeue_lock); | |
5e9ccc37 | 1394 | list_for_each_entry_safe(e, safe, &con->writequeue, list) { |
fdda387f PC |
1395 | list_del(&e->list); |
1396 | free_entry(e); | |
1397 | } | |
1398 | spin_unlock(&con->writequeue_lock); | |
1399 | } | |
1400 | ||
1401 | /* Called from recovery when it knows that a node has | |
1402 | left the cluster */ | |
1403 | int dlm_lowcomms_close(int nodeid) | |
1404 | { | |
1405 | struct connection *con; | |
1406 | ||
fdda387f PC |
1407 | log_print("closing connection to node %d", nodeid); |
1408 | con = nodeid2con(nodeid, 0); | |
1409 | if (con) { | |
063c4c99 LMB |
1410 | clear_bit(CF_CONNECT_PENDING, &con->flags); |
1411 | clear_bit(CF_WRITE_PENDING, &con->flags); | |
1412 | set_bit(CF_CLOSE, &con->flags); | |
1413 | if (cancel_work_sync(&con->swork)) | |
1414 | log_print("canceled swork for node %d", nodeid); | |
1415 | if (cancel_work_sync(&con->rwork)) | |
1416 | log_print("canceled rwork for node %d", nodeid); | |
fdda387f | 1417 | clean_one_writequeue(con); |
ac33d071 | 1418 | close_connection(con, true); |
fdda387f PC |
1419 | } |
1420 | return 0; | |
fdda387f PC |
1421 | } |
1422 | ||
6ed7257b | 1423 | /* Receive workqueue function */ |
1d6e8131 | 1424 | static void process_recv_sockets(struct work_struct *work) |
fdda387f | 1425 | { |
1d6e8131 PC |
1426 | struct connection *con = container_of(work, struct connection, rwork); |
1427 | int err; | |
fdda387f | 1428 | |
1d6e8131 PC |
1429 | clear_bit(CF_READ_PENDING, &con->flags); |
1430 | do { | |
1431 | err = con->rx_action(con); | |
1432 | } while (!err); | |
fdda387f PC |
1433 | } |
1434 | ||
6ed7257b | 1435 | /* Send workqueue function */ |
1d6e8131 | 1436 | static void process_send_sockets(struct work_struct *work) |
fdda387f | 1437 | { |
1d6e8131 | 1438 | struct connection *con = container_of(work, struct connection, swork); |
fdda387f | 1439 | |
1d6e8131 | 1440 | if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) { |
6ed7257b | 1441 | con->connect_action(con); |
063c4c99 | 1442 | set_bit(CF_WRITE_PENDING, &con->flags); |
fdda387f | 1443 | } |
063c4c99 LMB |
1444 | if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags)) |
1445 | send_to_sock(con); | |
fdda387f PC |
1446 | } |
1447 | ||
1448 | ||
1449 | /* Discard all entries on the write queues */ | |
1450 | static void clean_writequeues(void) | |
1451 | { | |
5e9ccc37 | 1452 | foreach_conn(clean_one_writequeue); |
fdda387f PC |
1453 | } |
1454 | ||
1d6e8131 | 1455 | static void work_stop(void) |
fdda387f | 1456 | { |
1d6e8131 PC |
1457 | destroy_workqueue(recv_workqueue); |
1458 | destroy_workqueue(send_workqueue); | |
fdda387f PC |
1459 | } |
1460 | ||
1d6e8131 | 1461 | static int work_start(void) |
fdda387f | 1462 | { |
fdda387f | 1463 | int error; |
dcce240e SW |
1464 | recv_workqueue = alloc_workqueue("dlm_recv", WQ_MEM_RECLAIM | |
1465 | WQ_HIGHPRI | WQ_FREEZEABLE, 0); | |
1d6e8131 | 1466 | error = IS_ERR(recv_workqueue); |
ac33d071 | 1467 | if (error) { |
1d6e8131 | 1468 | log_print("can't start dlm_recv %d", error); |
fdda387f PC |
1469 | return error; |
1470 | } | |
fdda387f | 1471 | |
dcce240e SW |
1472 | send_workqueue = alloc_workqueue("dlm_send", WQ_MEM_RECLAIM | |
1473 | WQ_HIGHPRI | WQ_FREEZEABLE, 0); | |
1d6e8131 | 1474 | error = IS_ERR(send_workqueue); |
ac33d071 | 1475 | if (error) { |
1d6e8131 PC |
1476 | log_print("can't start dlm_send %d", error); |
1477 | destroy_workqueue(recv_workqueue); | |
fdda387f PC |
1478 | return error; |
1479 | } | |
fdda387f PC |
1480 | |
1481 | return 0; | |
1482 | } | |
1483 | ||
5e9ccc37 | 1484 | static void stop_conn(struct connection *con) |
fdda387f | 1485 | { |
5e9ccc37 | 1486 | con->flags |= 0x0F; |
391fbdc5 | 1487 | if (con->sock && con->sock->sk) |
5e9ccc37 CC |
1488 | con->sock->sk->sk_user_data = NULL; |
1489 | } | |
fdda387f | 1490 | |
5e9ccc37 CC |
1491 | static void free_conn(struct connection *con) |
1492 | { | |
1493 | close_connection(con, true); | |
1494 | if (con->othercon) | |
1495 | kmem_cache_free(con_cache, con->othercon); | |
1496 | hlist_del(&con->list); | |
1497 | kmem_cache_free(con_cache, con); | |
1498 | } | |
1499 | ||
1500 | void dlm_lowcomms_stop(void) | |
1501 | { | |
ac33d071 | 1502 | /* Set all the flags to prevent any |
fdda387f PC |
1503 | socket activity. |
1504 | */ | |
7a936ce7 | 1505 | mutex_lock(&connections_lock); |
5e9ccc37 | 1506 | foreach_conn(stop_conn); |
7a936ce7 | 1507 | mutex_unlock(&connections_lock); |
ac33d071 | 1508 | |
1d6e8131 | 1509 | work_stop(); |
6ed7257b | 1510 | |
7a936ce7 | 1511 | mutex_lock(&connections_lock); |
fdda387f PC |
1512 | clean_writequeues(); |
1513 | ||
5e9ccc37 CC |
1514 | foreach_conn(free_conn); |
1515 | ||
7a936ce7 | 1516 | mutex_unlock(&connections_lock); |
fdda387f PC |
1517 | kmem_cache_destroy(con_cache); |
1518 | } | |
1519 | ||
fdda387f PC |
1520 | int dlm_lowcomms_start(void) |
1521 | { | |
6ed7257b PC |
1522 | int error = -EINVAL; |
1523 | struct connection *con; | |
5e9ccc37 CC |
1524 | int i; |
1525 | ||
1526 | for (i = 0; i < CONN_HASH_SIZE; i++) | |
1527 | INIT_HLIST_HEAD(&connection_hash[i]); | |
fdda387f | 1528 | |
6ed7257b PC |
1529 | init_local(); |
1530 | if (!dlm_local_count) { | |
617e82e1 | 1531 | error = -ENOTCONN; |
fdda387f | 1532 | log_print("no local IP address has been set"); |
6ed7257b | 1533 | goto out; |
fdda387f PC |
1534 | } |
1535 | ||
6ed7257b | 1536 | error = -ENOMEM; |
fdda387f | 1537 | con_cache = kmem_cache_create("dlm_conn", sizeof(struct connection), |
ac33d071 | 1538 | __alignof__(struct connection), 0, |
20c2df83 | 1539 | NULL); |
fdda387f | 1540 | if (!con_cache) |
6ed7257b | 1541 | goto out; |
fdda387f | 1542 | |
fdda387f | 1543 | /* Start listening */ |
6ed7257b PC |
1544 | if (dlm_config.ci_protocol == 0) |
1545 | error = tcp_listen_for_all(); | |
1546 | else | |
1547 | error = sctp_listen_for_all(); | |
fdda387f PC |
1548 | if (error) |
1549 | goto fail_unlisten; | |
1550 | ||
1d6e8131 | 1551 | error = work_start(); |
fdda387f PC |
1552 | if (error) |
1553 | goto fail_unlisten; | |
1554 | ||
fdda387f PC |
1555 | return 0; |
1556 | ||
ac33d071 | 1557 | fail_unlisten: |
6ed7257b PC |
1558 | con = nodeid2con(0,0); |
1559 | if (con) { | |
1560 | close_connection(con, false); | |
1561 | kmem_cache_free(con_cache, con); | |
1562 | } | |
fdda387f PC |
1563 | kmem_cache_destroy(con_cache); |
1564 | ||
ac33d071 | 1565 | out: |
fdda387f PC |
1566 | return error; |
1567 | } |