blob: f0bdfd944c44f53f35f7a11e00db26a2c16f87dc [file] [log] [blame]
Zach Brown98211482005-12-15 14:31:23 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 *
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * Copyright (C) 2004 Oracle. All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public
18 * License along with this program; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 021110-1307, USA.
21 *
22 * ----
23 *
24 * Callers for this were originally written against a very simple synchronus
25 * API. This implementation reflects those simple callers. Some day I'm sure
26 * we'll need to move to a more robust posting/callback mechanism.
27 *
28 * Transmit calls pass in kernel virtual addresses and block copying this into
29 * the socket's tx buffers via a usual blocking sendmsg. They'll block waiting
30 * for a failed socket to timeout. TX callers can also pass in a poniter to an
31 * 'int' which gets filled with an errno off the wire in response to the
32 * message they send.
33 *
34 * Handlers for unsolicited messages are registered. Each socket has a page
35 * that incoming data is copied into. First the header, then the data.
36 * Handlers are called from only one thread with a reference to this per-socket
37 * page. This page is destroyed after the handler call, so it can't be
38 * referenced beyond the call. Handlers may block but are discouraged from
39 * doing so.
40 *
41 * Any framing errors (bad magic, large payload lengths) close a connection.
42 *
43 * Our sock_container holds the state we associate with a socket. It's current
44 * framing state is held there as well as the refcounting we do around when it
45 * is safe to tear down the socket. The socket is only finally torn down from
46 * the container when the container loses all of its references -- so as long
47 * as you hold a ref on the container you can trust that the socket is valid
48 * for use with kernel socket APIs.
49 *
50 * Connections are initiated between a pair of nodes when the node with the
51 * higher node number gets a heartbeat callback which indicates that the lower
52 * numbered node has started heartbeating. The lower numbered node is passive
53 * and only accepts the connection if the higher numbered node is heartbeating.
54 */
55
56#include <linux/kernel.h>
57#include <linux/jiffies.h>
58#include <linux/slab.h>
59#include <linux/idr.h>
60#include <linux/kref.h>
61#include <net/tcp.h>
62
63#include <asm/uaccess.h>
64
65#include "heartbeat.h"
66#include "tcp.h"
67#include "nodemanager.h"
68#define MLOG_MASK_PREFIX ML_TCP
69#include "masklog.h"
70#include "quorum.h"
71
72#include "tcp_internal.h"
73
74/*
75 * The linux network stack isn't sparse endian clean.. It has macros like
76 * ntohs() which perform the endian checks and structs like sockaddr_in
77 * which aren't annotated. So __force is found here to get the build
78 * clean. When they emerge from the dark ages and annotate the code
79 * we can remove these.
80 */
81
82#define SC_NODEF_FMT "node %s (num %u) at %u.%u.%u.%u:%u"
83#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
84 NIPQUAD(sc->sc_node->nd_ipv4_address), \
85 ntohs(sc->sc_node->nd_ipv4_port)
86
87/*
88 * In the following two log macros, the whitespace after the ',' just
89 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
90 * previous token if args expands to nothing.
91 */
92#define msglog(hdr, fmt, args...) do { \
93 typeof(hdr) __hdr = (hdr); \
94 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
95 "key %08x num %u] " fmt, \
96 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
97 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
98 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
99 be32_to_cpu(__hdr->msg_num) , ##args); \
100} while (0)
101
102#define sclog(sc, fmt, args...) do { \
103 typeof(sc) __sc = (sc); \
104 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
105 "pg_off %zu] " fmt, __sc, \
106 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
107 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
108 ##args); \
109} while (0)
110
Ingo Molnar34af9462006-06-27 02:53:55 -0700111static DEFINE_RWLOCK(o2net_handler_lock);
Zach Brown98211482005-12-15 14:31:23 -0800112static struct rb_root o2net_handler_tree = RB_ROOT;
113
114static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
115
116/* XXX someday we'll need better accounting */
117static struct socket *o2net_listen_sock = NULL;
118
119/*
120 * listen work is only queued by the listening socket callbacks on the
121 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
122 * quorum work is queued as sock containers are shutdown.. stop_listening
123 * tears down all the node's sock containers, preventing future shutdowns
124 * and queued quroum work, before canceling delayed quorum work and
125 * destroying the work queue.
126 */
127static struct workqueue_struct *o2net_wq;
128static struct work_struct o2net_listen_work;
129
130static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
131#define O2NET_HB_PRI 0x1
132
133static struct o2net_handshake *o2net_hand;
134static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
135
136static int o2net_sys_err_translations[O2NET_ERR_MAX] =
137 {[O2NET_ERR_NONE] = 0,
138 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
139 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
140 [O2NET_ERR_DIED] = -EHOSTDOWN,};
141
142/* can't quite avoid *all* internal declarations :/ */
David Howellsc4028952006-11-22 14:57:56 +0000143static void o2net_sc_connect_completed(struct work_struct *work);
144static void o2net_rx_until_empty(struct work_struct *work);
145static void o2net_shutdown_sc(struct work_struct *work);
Zach Brown98211482005-12-15 14:31:23 -0800146static void o2net_listen_data_ready(struct sock *sk, int bytes);
David Howellsc4028952006-11-22 14:57:56 +0000147static void o2net_sc_send_keep_req(struct work_struct *work);
Zach Brown98211482005-12-15 14:31:23 -0800148static void o2net_idle_timer(unsigned long data);
149static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100150static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
151
152/*
153 * FIXME: These should use to_o2nm_cluster_from_node(), but we end up
154 * losing our parent link to the cluster during shutdown. This can be
155 * solved by adding a pre-removal callback to configfs, or passing
156 * around the cluster with the node. -jeffm
157 */
158static inline int o2net_reconnect_delay(struct o2nm_node *node)
159{
160 return o2nm_single_cluster->cl_reconnect_delay_ms;
161}
162
163static inline int o2net_keepalive_delay(struct o2nm_node *node)
164{
165 return o2nm_single_cluster->cl_keepalive_delay_ms;
166}
167
168static inline int o2net_idle_timeout(struct o2nm_node *node)
169{
170 return o2nm_single_cluster->cl_idle_timeout_ms;
171}
Zach Brown98211482005-12-15 14:31:23 -0800172
173static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
174{
175 int trans;
176 BUG_ON(err >= O2NET_ERR_MAX);
177 trans = o2net_sys_err_translations[err];
178
179 /* Just in case we mess up the translation table above */
180 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
181 return trans;
182}
183
184static struct o2net_node * o2net_nn_from_num(u8 node_num)
185{
186 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
187 return &o2net_nodes[node_num];
188}
189
190static u8 o2net_num_from_nn(struct o2net_node *nn)
191{
192 BUG_ON(nn == NULL);
193 return nn - o2net_nodes;
194}
195
196/* ------------------------------------------------------------ */
197
198static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
199{
200 int ret = 0;
201
202 do {
203 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
204 ret = -EAGAIN;
205 break;
206 }
207 spin_lock(&nn->nn_lock);
208 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
209 if (ret == 0)
210 list_add_tail(&nsw->ns_node_item,
211 &nn->nn_status_list);
212 spin_unlock(&nn->nn_lock);
213 } while (ret == -EAGAIN);
214
215 if (ret == 0) {
216 init_waitqueue_head(&nsw->ns_wq);
217 nsw->ns_sys_status = O2NET_ERR_NONE;
218 nsw->ns_status = 0;
219 }
220
221 return ret;
222}
223
224static void o2net_complete_nsw_locked(struct o2net_node *nn,
225 struct o2net_status_wait *nsw,
226 enum o2net_system_error sys_status,
227 s32 status)
228{
229 assert_spin_locked(&nn->nn_lock);
230
231 if (!list_empty(&nsw->ns_node_item)) {
232 list_del_init(&nsw->ns_node_item);
233 nsw->ns_sys_status = sys_status;
234 nsw->ns_status = status;
235 idr_remove(&nn->nn_status_idr, nsw->ns_id);
236 wake_up(&nsw->ns_wq);
237 }
238}
239
240static void o2net_complete_nsw(struct o2net_node *nn,
241 struct o2net_status_wait *nsw,
242 u64 id, enum o2net_system_error sys_status,
243 s32 status)
244{
245 spin_lock(&nn->nn_lock);
246 if (nsw == NULL) {
247 if (id > INT_MAX)
248 goto out;
249
250 nsw = idr_find(&nn->nn_status_idr, id);
251 if (nsw == NULL)
252 goto out;
253 }
254
255 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
256
257out:
258 spin_unlock(&nn->nn_lock);
259 return;
260}
261
262static void o2net_complete_nodes_nsw(struct o2net_node *nn)
263{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200264 struct o2net_status_wait *nsw, *tmp;
Zach Brown98211482005-12-15 14:31:23 -0800265 unsigned int num_kills = 0;
Zach Brown98211482005-12-15 14:31:23 -0800266
267 assert_spin_locked(&nn->nn_lock);
268
Christoph Hellwig800deef2007-05-17 16:03:13 +0200269 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
Zach Brown98211482005-12-15 14:31:23 -0800270 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
271 num_kills++;
272 }
273
274 mlog(0, "completed %d messages for node %u\n", num_kills,
275 o2net_num_from_nn(nn));
276}
277
278static int o2net_nsw_completed(struct o2net_node *nn,
279 struct o2net_status_wait *nsw)
280{
281 int completed;
282 spin_lock(&nn->nn_lock);
283 completed = list_empty(&nsw->ns_node_item);
284 spin_unlock(&nn->nn_lock);
285 return completed;
286}
287
288/* ------------------------------------------------------------ */
289
290static void sc_kref_release(struct kref *kref)
291{
292 struct o2net_sock_container *sc = container_of(kref,
293 struct o2net_sock_container, sc_kref);
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100294 BUG_ON(timer_pending(&sc->sc_idle_timeout));
295
Zach Brown98211482005-12-15 14:31:23 -0800296 sclog(sc, "releasing\n");
297
298 if (sc->sc_sock) {
299 sock_release(sc->sc_sock);
300 sc->sc_sock = NULL;
301 }
302
303 o2nm_node_put(sc->sc_node);
304 sc->sc_node = NULL;
305
306 kfree(sc);
307}
308
309static void sc_put(struct o2net_sock_container *sc)
310{
311 sclog(sc, "put\n");
312 kref_put(&sc->sc_kref, sc_kref_release);
313}
314static void sc_get(struct o2net_sock_container *sc)
315{
316 sclog(sc, "get\n");
317 kref_get(&sc->sc_kref);
318}
319static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
320{
321 struct o2net_sock_container *sc, *ret = NULL;
322 struct page *page = NULL;
323
324 page = alloc_page(GFP_NOFS);
Robert P. J. Daycd861282006-12-13 00:34:52 -0800325 sc = kzalloc(sizeof(*sc), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800326 if (sc == NULL || page == NULL)
327 goto out;
328
329 kref_init(&sc->sc_kref);
330 o2nm_node_get(node);
331 sc->sc_node = node;
332
David Howellsc4028952006-11-22 14:57:56 +0000333 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
334 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
335 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
336 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
Zach Brown98211482005-12-15 14:31:23 -0800337
338 init_timer(&sc->sc_idle_timeout);
339 sc->sc_idle_timeout.function = o2net_idle_timer;
340 sc->sc_idle_timeout.data = (unsigned long)sc;
341
342 sclog(sc, "alloced\n");
343
344 ret = sc;
345 sc->sc_page = page;
346 sc = NULL;
347 page = NULL;
348
349out:
350 if (page)
351 __free_page(page);
352 kfree(sc);
353
354 return ret;
355}
356
357/* ------------------------------------------------------------ */
358
359static void o2net_sc_queue_work(struct o2net_sock_container *sc,
360 struct work_struct *work)
361{
362 sc_get(sc);
363 if (!queue_work(o2net_wq, work))
364 sc_put(sc);
365}
366static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000367 struct delayed_work *work,
Zach Brown98211482005-12-15 14:31:23 -0800368 int delay)
369{
370 sc_get(sc);
371 if (!queue_delayed_work(o2net_wq, work, delay))
372 sc_put(sc);
373}
374static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
David Howellsc4028952006-11-22 14:57:56 +0000375 struct delayed_work *work)
Zach Brown98211482005-12-15 14:31:23 -0800376{
377 if (cancel_delayed_work(work))
378 sc_put(sc);
379}
380
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100381static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
382
383int o2net_num_connected_peers(void)
384{
385 return atomic_read(&o2net_connected_peers);
386}
387
Zach Brown98211482005-12-15 14:31:23 -0800388static void o2net_set_nn_state(struct o2net_node *nn,
389 struct o2net_sock_container *sc,
390 unsigned valid, int err)
391{
392 int was_valid = nn->nn_sc_valid;
393 int was_err = nn->nn_persistent_error;
394 struct o2net_sock_container *old_sc = nn->nn_sc;
395
396 assert_spin_locked(&nn->nn_lock);
397
Andrew Beekhof828ae6a2006-12-04 14:04:55 +0100398 if (old_sc && !sc)
399 atomic_dec(&o2net_connected_peers);
400 else if (!old_sc && sc)
401 atomic_inc(&o2net_connected_peers);
402
Zach Brown98211482005-12-15 14:31:23 -0800403 /* the node num comparison and single connect/accept path should stop
404 * an non-null sc from being overwritten with another */
405 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
406 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
407 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
408
409 /* we won't reconnect after our valid conn goes away for
410 * this hb iteration.. here so it shows up in the logs */
411 if (was_valid && !valid && err == 0)
412 err = -ENOTCONN;
413
414 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
415 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
416 nn->nn_persistent_error, err);
417
418 nn->nn_sc = sc;
419 nn->nn_sc_valid = valid ? 1 : 0;
420 nn->nn_persistent_error = err;
421
422 /* mirrors o2net_tx_can_proceed() */
423 if (nn->nn_persistent_error || nn->nn_sc_valid)
424 wake_up(&nn->nn_sc_wq);
425
426 if (!was_err && nn->nn_persistent_error) {
427 o2quo_conn_err(o2net_num_from_nn(nn));
428 queue_delayed_work(o2net_wq, &nn->nn_still_up,
429 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
430 }
431
432 if (was_valid && !valid) {
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700433 printk(KERN_INFO "o2net: no longer connected to "
434 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
Zach Brown98211482005-12-15 14:31:23 -0800435 o2net_complete_nodes_nsw(nn);
436 }
437
438 if (!was_valid && valid) {
439 o2quo_conn_up(o2net_num_from_nn(nn));
440 /* this is a bit of a hack. we only try reconnecting
441 * when heartbeating starts until we get a connection.
442 * if that connection then dies we don't try reconnecting.
443 * the only way to start connecting again is to down
444 * heartbeat and bring it back up. */
445 cancel_delayed_work(&nn->nn_connect_expired);
Sunil Mushran781ee3e2006-04-27 16:41:31 -0700446 printk(KERN_INFO "o2net: %s " SC_NODEF_FMT "\n",
447 o2nm_this_node() > sc->sc_node->nd_num ?
448 "connected to" : "accepted connection from",
449 SC_NODEF_ARGS(sc));
Zach Brown98211482005-12-15 14:31:23 -0800450 }
451
452 /* trigger the connecting worker func as long as we're not valid,
453 * it will back off if it shouldn't connect. This can be called
454 * from node config teardown and so needs to be careful about
455 * the work queue actually being up. */
456 if (!valid && o2net_wq) {
457 unsigned long delay;
458 /* delay if we're withing a RECONNECT_DELAY of the
459 * last attempt */
460 delay = (nn->nn_last_connect_attempt +
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100461 msecs_to_jiffies(o2net_reconnect_delay(sc->sc_node)))
Zach Brown98211482005-12-15 14:31:23 -0800462 - jiffies;
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +0100463 if (delay > msecs_to_jiffies(o2net_reconnect_delay(sc->sc_node)))
Zach Brown98211482005-12-15 14:31:23 -0800464 delay = 0;
465 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
466 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
467 }
468
469 /* keep track of the nn's sc ref for the caller */
470 if ((old_sc == NULL) && sc)
471 sc_get(sc);
472 if (old_sc && (old_sc != sc)) {
473 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
474 sc_put(old_sc);
475 }
476}
477
478/* see o2net_register_callbacks() */
479static void o2net_data_ready(struct sock *sk, int bytes)
480{
481 void (*ready)(struct sock *sk, int bytes);
482
483 read_lock(&sk->sk_callback_lock);
484 if (sk->sk_user_data) {
485 struct o2net_sock_container *sc = sk->sk_user_data;
486 sclog(sc, "data_ready hit\n");
487 do_gettimeofday(&sc->sc_tv_data_ready);
488 o2net_sc_queue_work(sc, &sc->sc_rx_work);
489 ready = sc->sc_data_ready;
490 } else {
491 ready = sk->sk_data_ready;
492 }
493 read_unlock(&sk->sk_callback_lock);
494
495 ready(sk, bytes);
496}
497
498/* see o2net_register_callbacks() */
499static void o2net_state_change(struct sock *sk)
500{
501 void (*state_change)(struct sock *sk);
502 struct o2net_sock_container *sc;
503
504 read_lock(&sk->sk_callback_lock);
505 sc = sk->sk_user_data;
506 if (sc == NULL) {
507 state_change = sk->sk_state_change;
508 goto out;
509 }
510
511 sclog(sc, "state_change to %d\n", sk->sk_state);
512
513 state_change = sc->sc_state_change;
514
515 switch(sk->sk_state) {
516 /* ignore connecting sockets as they make progress */
517 case TCP_SYN_SENT:
518 case TCP_SYN_RECV:
519 break;
520 case TCP_ESTABLISHED:
521 o2net_sc_queue_work(sc, &sc->sc_connect_work);
522 break;
523 default:
524 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
525 break;
526 }
527out:
528 read_unlock(&sk->sk_callback_lock);
529 state_change(sk);
530}
531
532/*
533 * we register callbacks so we can queue work on events before calling
534 * the original callbacks. our callbacks our careful to test user_data
535 * to discover when they've reaced with o2net_unregister_callbacks().
536 */
537static void o2net_register_callbacks(struct sock *sk,
538 struct o2net_sock_container *sc)
539{
540 write_lock_bh(&sk->sk_callback_lock);
541
542 /* accepted sockets inherit the old listen socket data ready */
543 if (sk->sk_data_ready == o2net_listen_data_ready) {
544 sk->sk_data_ready = sk->sk_user_data;
545 sk->sk_user_data = NULL;
546 }
547
548 BUG_ON(sk->sk_user_data != NULL);
549 sk->sk_user_data = sc;
550 sc_get(sc);
551
552 sc->sc_data_ready = sk->sk_data_ready;
553 sc->sc_state_change = sk->sk_state_change;
554 sk->sk_data_ready = o2net_data_ready;
555 sk->sk_state_change = o2net_state_change;
556
Zhen Wei925037b2007-01-23 17:19:59 -0800557 mutex_init(&sc->sc_send_lock);
558
Zach Brown98211482005-12-15 14:31:23 -0800559 write_unlock_bh(&sk->sk_callback_lock);
560}
561
562static int o2net_unregister_callbacks(struct sock *sk,
563 struct o2net_sock_container *sc)
564{
565 int ret = 0;
566
567 write_lock_bh(&sk->sk_callback_lock);
568 if (sk->sk_user_data == sc) {
569 ret = 1;
570 sk->sk_user_data = NULL;
571 sk->sk_data_ready = sc->sc_data_ready;
572 sk->sk_state_change = sc->sc_state_change;
573 }
574 write_unlock_bh(&sk->sk_callback_lock);
575
576 return ret;
577}
578
579/*
580 * this is a little helper that is called by callers who have seen a problem
581 * with an sc and want to detach it from the nn if someone already hasn't beat
582 * them to it. if an error is given then the shutdown will be persistent
583 * and pending transmits will be canceled.
584 */
585static void o2net_ensure_shutdown(struct o2net_node *nn,
586 struct o2net_sock_container *sc,
587 int err)
588{
589 spin_lock(&nn->nn_lock);
590 if (nn->nn_sc == sc)
591 o2net_set_nn_state(nn, NULL, 0, err);
592 spin_unlock(&nn->nn_lock);
593}
594
595/*
596 * This work queue function performs the blocking parts of socket shutdown. A
597 * few paths lead here. set_nn_state will trigger this callback if it sees an
598 * sc detached from the nn. state_change will also trigger this callback
599 * directly when it sees errors. In that case we need to call set_nn_state
600 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
601 * itself.
602 */
David Howellsc4028952006-11-22 14:57:56 +0000603static void o2net_shutdown_sc(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -0800604{
David Howellsc4028952006-11-22 14:57:56 +0000605 struct o2net_sock_container *sc =
606 container_of(work, struct o2net_sock_container,
607 sc_shutdown_work);
Zach Brown98211482005-12-15 14:31:23 -0800608 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
609
610 sclog(sc, "shutting down\n");
611
612 /* drop the callbacks ref and call shutdown only once */
613 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
614 /* we shouldn't flush as we're in the thread, the
615 * races with pending sc work structs are harmless */
616 del_timer_sync(&sc->sc_idle_timeout);
617 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
618 sc_put(sc);
619 sc->sc_sock->ops->shutdown(sc->sc_sock,
620 RCV_SHUTDOWN|SEND_SHUTDOWN);
621 }
622
623 /* not fatal so failed connects before the other guy has our
624 * heartbeat can be retried */
625 o2net_ensure_shutdown(nn, sc, 0);
626 sc_put(sc);
627}
628
629/* ------------------------------------------------------------ */
630
631static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
632 u32 key)
633{
634 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
635
636 if (ret == 0)
637 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
638
639 return ret;
640}
641
642static struct o2net_msg_handler *
643o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
644 struct rb_node **ret_parent)
645{
646 struct rb_node **p = &o2net_handler_tree.rb_node;
647 struct rb_node *parent = NULL;
648 struct o2net_msg_handler *nmh, *ret = NULL;
649 int cmp;
650
651 while (*p) {
652 parent = *p;
653 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
654 cmp = o2net_handler_cmp(nmh, msg_type, key);
655
656 if (cmp < 0)
657 p = &(*p)->rb_left;
658 else if (cmp > 0)
659 p = &(*p)->rb_right;
660 else {
661 ret = nmh;
662 break;
663 }
664 }
665
666 if (ret_p != NULL)
667 *ret_p = p;
668 if (ret_parent != NULL)
669 *ret_parent = parent;
670
671 return ret;
672}
673
674static void o2net_handler_kref_release(struct kref *kref)
675{
676 struct o2net_msg_handler *nmh;
677 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
678
679 kfree(nmh);
680}
681
682static void o2net_handler_put(struct o2net_msg_handler *nmh)
683{
684 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
685}
686
687/* max_len is protection for the handler func. incoming messages won't
688 * be given to the handler if their payload is longer than the max. */
689int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
690 o2net_msg_handler_func *func, void *data,
Kurt Hackeld74c9802007-01-17 17:04:25 -0800691 o2net_post_msg_handler_func *post_func,
Zach Brown98211482005-12-15 14:31:23 -0800692 struct list_head *unreg_list)
693{
694 struct o2net_msg_handler *nmh = NULL;
695 struct rb_node **p, *parent;
696 int ret = 0;
697
698 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
699 mlog(0, "max_len for message handler out of range: %u\n",
700 max_len);
701 ret = -EINVAL;
702 goto out;
703 }
704
705 if (!msg_type) {
706 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
707 ret = -EINVAL;
708 goto out;
709
710 }
711 if (!func) {
712 mlog(0, "no message handler provided: %u, %p\n",
713 msg_type, func);
714 ret = -EINVAL;
715 goto out;
716 }
717
Robert P. J. Daycd861282006-12-13 00:34:52 -0800718 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
Zach Brown98211482005-12-15 14:31:23 -0800719 if (nmh == NULL) {
720 ret = -ENOMEM;
721 goto out;
722 }
723
724 nmh->nh_func = func;
725 nmh->nh_func_data = data;
Kurt Hackeld74c9802007-01-17 17:04:25 -0800726 nmh->nh_post_func = post_func;
Zach Brown98211482005-12-15 14:31:23 -0800727 nmh->nh_msg_type = msg_type;
728 nmh->nh_max_len = max_len;
729 nmh->nh_key = key;
730 /* the tree and list get this ref.. they're both removed in
731 * unregister when this ref is dropped */
732 kref_init(&nmh->nh_kref);
733 INIT_LIST_HEAD(&nmh->nh_unregister_item);
734
735 write_lock(&o2net_handler_lock);
736 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
737 ret = -EEXIST;
738 else {
739 rb_link_node(&nmh->nh_node, parent, p);
740 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
741 list_add_tail(&nmh->nh_unregister_item, unreg_list);
742
743 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
744 func, msg_type, key);
745 /* we've had some trouble with handlers seemingly vanishing. */
746 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
747 &parent) == NULL,
748 "couldn't find handler we *just* registerd "
749 "for type %u key %08x\n", msg_type, key);
750 }
751 write_unlock(&o2net_handler_lock);
752 if (ret)
753 goto out;
754
755out:
756 if (ret)
757 kfree(nmh);
758
759 return ret;
760}
761EXPORT_SYMBOL_GPL(o2net_register_handler);
762
763void o2net_unregister_handler_list(struct list_head *list)
764{
Christoph Hellwig800deef2007-05-17 16:03:13 +0200765 struct o2net_msg_handler *nmh, *n;
Zach Brown98211482005-12-15 14:31:23 -0800766
767 write_lock(&o2net_handler_lock);
Christoph Hellwig800deef2007-05-17 16:03:13 +0200768 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
Zach Brown98211482005-12-15 14:31:23 -0800769 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
770 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
771 rb_erase(&nmh->nh_node, &o2net_handler_tree);
772 list_del_init(&nmh->nh_unregister_item);
773 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
774 }
775 write_unlock(&o2net_handler_lock);
776}
777EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
778
779static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
780{
781 struct o2net_msg_handler *nmh;
782
783 read_lock(&o2net_handler_lock);
784 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
785 if (nmh)
786 kref_get(&nmh->nh_kref);
787 read_unlock(&o2net_handler_lock);
788
789 return nmh;
790}
791
792/* ------------------------------------------------------------ */
793
794static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
795{
796 int ret;
797 mm_segment_t oldfs;
798 struct kvec vec = {
799 .iov_len = len,
800 .iov_base = data,
801 };
802 struct msghdr msg = {
803 .msg_iovlen = 1,
804 .msg_iov = (struct iovec *)&vec,
805 .msg_flags = MSG_DONTWAIT,
806 };
807
808 oldfs = get_fs();
809 set_fs(get_ds());
810 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
811 set_fs(oldfs);
812
813 return ret;
814}
815
816static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
817 size_t veclen, size_t total)
818{
819 int ret;
820 mm_segment_t oldfs;
821 struct msghdr msg = {
822 .msg_iov = (struct iovec *)vec,
823 .msg_iovlen = veclen,
824 };
825
826 if (sock == NULL) {
827 ret = -EINVAL;
828 goto out;
829 }
830
831 oldfs = get_fs();
832 set_fs(get_ds());
833 ret = sock_sendmsg(sock, &msg, total);
834 set_fs(oldfs);
835 if (ret != total) {
836 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
837 total);
838 if (ret >= 0)
839 ret = -EPIPE; /* should be smarter, I bet */
840 goto out;
841 }
842
843 ret = 0;
844out:
845 if (ret < 0)
846 mlog(0, "returning error: %d\n", ret);
847 return ret;
848}
849
850static void o2net_sendpage(struct o2net_sock_container *sc,
851 void *kmalloced_virt,
852 size_t size)
853{
854 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
855 ssize_t ret;
856
857
Zhen Wei925037b2007-01-23 17:19:59 -0800858 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -0800859 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
860 virt_to_page(kmalloced_virt),
861 (long)kmalloced_virt & ~PAGE_MASK,
862 size, MSG_DONTWAIT);
Zhen Wei925037b2007-01-23 17:19:59 -0800863 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -0800864 if (ret != size) {
865 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
866 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
867 o2net_ensure_shutdown(nn, sc, 0);
868 }
869}
870
871static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
872{
873 memset(msg, 0, sizeof(struct o2net_msg));
874 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
875 msg->data_len = cpu_to_be16(data_len);
876 msg->msg_type = cpu_to_be16(msg_type);
877 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
878 msg->status = 0;
879 msg->key = cpu_to_be32(key);
880}
881
882static int o2net_tx_can_proceed(struct o2net_node *nn,
883 struct o2net_sock_container **sc_ret,
884 int *error)
885{
886 int ret = 0;
887
888 spin_lock(&nn->nn_lock);
889 if (nn->nn_persistent_error) {
890 ret = 1;
891 *sc_ret = NULL;
892 *error = nn->nn_persistent_error;
893 } else if (nn->nn_sc_valid) {
894 kref_get(&nn->nn_sc->sc_kref);
895
896 ret = 1;
897 *sc_ret = nn->nn_sc;
898 *error = 0;
899 }
900 spin_unlock(&nn->nn_lock);
901
902 return ret;
903}
904
905int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
906 size_t caller_veclen, u8 target_node, int *status)
907{
908 int ret, error = 0;
909 struct o2net_msg *msg = NULL;
910 size_t veclen, caller_bytes = 0;
911 struct kvec *vec = NULL;
912 struct o2net_sock_container *sc = NULL;
913 struct o2net_node *nn = o2net_nn_from_num(target_node);
914 struct o2net_status_wait nsw = {
915 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
916 };
917
918 if (o2net_wq == NULL) {
919 mlog(0, "attempt to tx without o2netd running\n");
920 ret = -ESRCH;
921 goto out;
922 }
923
924 if (caller_veclen == 0) {
925 mlog(0, "bad kvec array length\n");
926 ret = -EINVAL;
927 goto out;
928 }
929
930 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
931 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
932 mlog(0, "total payload len %zu too large\n", caller_bytes);
933 ret = -EINVAL;
934 goto out;
935 }
936
937 if (target_node == o2nm_this_node()) {
938 ret = -ELOOP;
939 goto out;
940 }
941
942 ret = wait_event_interruptible(nn->nn_sc_wq,
943 o2net_tx_can_proceed(nn, &sc, &error));
944 if (!ret && error)
945 ret = error;
946 if (ret)
947 goto out;
948
949 veclen = caller_veclen + 1;
950 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
951 if (vec == NULL) {
952 mlog(0, "failed to %zu element kvec!\n", veclen);
953 ret = -ENOMEM;
954 goto out;
955 }
956
957 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
958 if (!msg) {
959 mlog(0, "failed to allocate a o2net_msg!\n");
960 ret = -ENOMEM;
961 goto out;
962 }
963
964 o2net_init_msg(msg, caller_bytes, msg_type, key);
965
966 vec[0].iov_len = sizeof(struct o2net_msg);
967 vec[0].iov_base = msg;
968 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
969
970 ret = o2net_prep_nsw(nn, &nsw);
971 if (ret)
972 goto out;
973
974 msg->msg_num = cpu_to_be32(nsw.ns_id);
975
976 /* finally, convert the message header to network byte-order
977 * and send */
Zhen Wei925037b2007-01-23 17:19:59 -0800978 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -0800979 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
980 sizeof(struct o2net_msg) + caller_bytes);
Zhen Wei925037b2007-01-23 17:19:59 -0800981 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -0800982 msglog(msg, "sending returned %d\n", ret);
983 if (ret < 0) {
984 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
985 goto out;
986 }
987
988 /* wait on other node's handler */
989 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
990
991 /* Note that we avoid overwriting the callers status return
992 * variable if a system error was reported on the other
993 * side. Callers beware. */
994 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
995 if (status && !ret)
996 *status = nsw.ns_status;
997
998 mlog(0, "woken, returning system status %d, user status %d\n",
999 ret, nsw.ns_status);
1000out:
1001 if (sc)
1002 sc_put(sc);
1003 if (vec)
1004 kfree(vec);
1005 if (msg)
1006 kfree(msg);
1007 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1008 return ret;
1009}
1010EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1011
1012int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1013 u8 target_node, int *status)
1014{
1015 struct kvec vec = {
1016 .iov_base = data,
1017 .iov_len = len,
1018 };
1019 return o2net_send_message_vec(msg_type, key, &vec, 1,
1020 target_node, status);
1021}
1022EXPORT_SYMBOL_GPL(o2net_send_message);
1023
1024static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1025 enum o2net_system_error syserr, int err)
1026{
1027 struct kvec vec = {
1028 .iov_base = hdr,
1029 .iov_len = sizeof(struct o2net_msg),
1030 };
1031
1032 BUG_ON(syserr >= O2NET_ERR_MAX);
1033
1034 /* leave other fields intact from the incoming message, msg_num
1035 * in particular */
1036 hdr->sys_status = cpu_to_be32(syserr);
1037 hdr->status = cpu_to_be32(err);
1038 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1039 hdr->data_len = 0;
1040
1041 msglog(hdr, "about to send status magic %d\n", err);
1042 /* hdr has been in host byteorder this whole time */
1043 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1044}
1045
1046/* this returns -errno if the header was unknown or too large, etc.
1047 * after this is called the buffer us reused for the next message */
1048static int o2net_process_message(struct o2net_sock_container *sc,
1049 struct o2net_msg *hdr)
1050{
1051 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1052 int ret = 0, handler_status;
1053 enum o2net_system_error syserr;
1054 struct o2net_msg_handler *nmh = NULL;
Kurt Hackeld74c9802007-01-17 17:04:25 -08001055 void *ret_data = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001056
1057 msglog(hdr, "processing message\n");
1058
1059 o2net_sc_postpone_idle(sc);
1060
1061 switch(be16_to_cpu(hdr->magic)) {
1062 case O2NET_MSG_STATUS_MAGIC:
1063 /* special type for returning message status */
1064 o2net_complete_nsw(nn, NULL,
1065 be32_to_cpu(hdr->msg_num),
1066 be32_to_cpu(hdr->sys_status),
1067 be32_to_cpu(hdr->status));
1068 goto out;
1069 case O2NET_MSG_KEEP_REQ_MAGIC:
1070 o2net_sendpage(sc, o2net_keep_resp,
1071 sizeof(*o2net_keep_resp));
1072 goto out;
1073 case O2NET_MSG_KEEP_RESP_MAGIC:
1074 goto out;
1075 case O2NET_MSG_MAGIC:
1076 break;
1077 default:
1078 msglog(hdr, "bad magic\n");
1079 ret = -EINVAL;
1080 goto out;
1081 break;
1082 }
1083
1084 /* find a handler for it */
1085 handler_status = 0;
1086 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1087 be32_to_cpu(hdr->key));
1088 if (!nmh) {
1089 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1090 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1091 syserr = O2NET_ERR_NO_HNDLR;
1092 goto out_respond;
1093 }
1094
1095 syserr = O2NET_ERR_NONE;
1096
1097 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1098 syserr = O2NET_ERR_OVERFLOW;
1099
1100 if (syserr != O2NET_ERR_NONE)
1101 goto out_respond;
1102
1103 do_gettimeofday(&sc->sc_tv_func_start);
1104 sc->sc_msg_key = be32_to_cpu(hdr->key);
1105 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1106 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1107 be16_to_cpu(hdr->data_len),
Kurt Hackeld74c9802007-01-17 17:04:25 -08001108 nmh->nh_func_data, &ret_data);
Zach Brown98211482005-12-15 14:31:23 -08001109 do_gettimeofday(&sc->sc_tv_func_stop);
1110
1111out_respond:
1112 /* this destroys the hdr, so don't use it after this */
Zhen Wei925037b2007-01-23 17:19:59 -08001113 mutex_lock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001114 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1115 handler_status);
Zhen Wei925037b2007-01-23 17:19:59 -08001116 mutex_unlock(&sc->sc_send_lock);
Zach Brown98211482005-12-15 14:31:23 -08001117 hdr = NULL;
1118 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1119 handler_status, syserr, ret);
1120
Kurt Hackeld74c9802007-01-17 17:04:25 -08001121 if (nmh) {
1122 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1123 if (nmh->nh_post_func)
1124 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1125 ret_data);
1126 }
1127
Zach Brown98211482005-12-15 14:31:23 -08001128out:
1129 if (nmh)
1130 o2net_handler_put(nmh);
1131 return ret;
1132}
1133
1134static int o2net_check_handshake(struct o2net_sock_container *sc)
1135{
1136 struct o2net_handshake *hand = page_address(sc->sc_page);
1137 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1138
1139 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1140 mlog(ML_NOTICE, SC_NODEF_FMT " advertised net protocol "
1141 "version %llu but %llu is required, disconnecting\n",
1142 SC_NODEF_ARGS(sc),
1143 (unsigned long long)be64_to_cpu(hand->protocol_version),
1144 O2NET_PROTOCOL_VERSION);
1145
1146 /* don't bother reconnecting if its the wrong version. */
1147 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1148 return -1;
1149 }
1150
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001151 /*
1152 * Ensure timeouts are consistent with other nodes, otherwise
1153 * we can end up with one node thinking that the other must be down,
1154 * but isn't. This can ultimately cause corruption.
1155 */
1156 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1157 o2net_idle_timeout(sc->sc_node)) {
1158 mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of "
1159 "%u ms, but we use %u ms locally. disconnecting\n",
1160 SC_NODEF_ARGS(sc),
1161 be32_to_cpu(hand->o2net_idle_timeout_ms),
1162 o2net_idle_timeout(sc->sc_node));
1163 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1164 return -1;
1165 }
1166
1167 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1168 o2net_keepalive_delay(sc->sc_node)) {
1169 mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of "
1170 "%u ms, but we use %u ms locally. disconnecting\n",
1171 SC_NODEF_ARGS(sc),
1172 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1173 o2net_keepalive_delay(sc->sc_node));
1174 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1175 return -1;
1176 }
1177
1178 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1179 O2HB_MAX_WRITE_TIMEOUT_MS) {
1180 mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of "
1181 "%u ms, but we use %u ms locally. disconnecting\n",
1182 SC_NODEF_ARGS(sc),
1183 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1184 O2HB_MAX_WRITE_TIMEOUT_MS);
1185 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1186 return -1;
1187 }
1188
Zach Brown98211482005-12-15 14:31:23 -08001189 sc->sc_handshake_ok = 1;
1190
1191 spin_lock(&nn->nn_lock);
1192 /* set valid and queue the idle timers only if it hasn't been
1193 * shut down already */
1194 if (nn->nn_sc == sc) {
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001195 o2net_sc_reset_idle_timer(sc);
Zach Brown98211482005-12-15 14:31:23 -08001196 o2net_set_nn_state(nn, sc, 1, 0);
1197 }
1198 spin_unlock(&nn->nn_lock);
1199
1200 /* shift everything up as though it wasn't there */
1201 sc->sc_page_off -= sizeof(struct o2net_handshake);
1202 if (sc->sc_page_off)
1203 memmove(hand, hand + 1, sc->sc_page_off);
1204
1205 return 0;
1206}
1207
1208/* this demuxes the queued rx bytes into header or payload bits and calls
1209 * handlers as each full message is read off the socket. it returns -error,
1210 * == 0 eof, or > 0 for progress made.*/
1211static int o2net_advance_rx(struct o2net_sock_container *sc)
1212{
1213 struct o2net_msg *hdr;
1214 int ret = 0;
1215 void *data;
1216 size_t datalen;
1217
1218 sclog(sc, "receiving\n");
1219 do_gettimeofday(&sc->sc_tv_advance_start);
1220
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001221 if (unlikely(sc->sc_handshake_ok == 0)) {
1222 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1223 data = page_address(sc->sc_page) + sc->sc_page_off;
1224 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1225 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1226 if (ret > 0)
1227 sc->sc_page_off += ret;
1228 }
1229
1230 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1231 o2net_check_handshake(sc);
1232 if (unlikely(sc->sc_handshake_ok == 0))
1233 ret = -EPROTO;
1234 }
1235 goto out;
1236 }
1237
Zach Brown98211482005-12-15 14:31:23 -08001238 /* do we need more header? */
1239 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1240 data = page_address(sc->sc_page) + sc->sc_page_off;
1241 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1242 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1243 if (ret > 0) {
1244 sc->sc_page_off += ret;
Zach Brown98211482005-12-15 14:31:23 -08001245 /* only swab incoming here.. we can
1246 * only get here once as we cross from
1247 * being under to over */
1248 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1249 hdr = page_address(sc->sc_page);
1250 if (be16_to_cpu(hdr->data_len) >
1251 O2NET_MAX_PAYLOAD_BYTES)
1252 ret = -EOVERFLOW;
1253 }
1254 }
1255 if (ret <= 0)
1256 goto out;
1257 }
1258
1259 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1260 /* oof, still don't have a header */
1261 goto out;
1262 }
1263
1264 /* this was swabbed above when we first read it */
1265 hdr = page_address(sc->sc_page);
1266
1267 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1268
1269 /* do we need more payload? */
1270 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1271 /* need more payload */
1272 data = page_address(sc->sc_page) + sc->sc_page_off;
1273 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1274 sc->sc_page_off;
1275 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1276 if (ret > 0)
1277 sc->sc_page_off += ret;
1278 if (ret <= 0)
1279 goto out;
1280 }
1281
1282 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1283 /* we can only get here once, the first time we read
1284 * the payload.. so set ret to progress if the handler
1285 * works out. after calling this the message is toast */
1286 ret = o2net_process_message(sc, hdr);
1287 if (ret == 0)
1288 ret = 1;
1289 sc->sc_page_off = 0;
1290 }
1291
1292out:
1293 sclog(sc, "ret = %d\n", ret);
1294 do_gettimeofday(&sc->sc_tv_advance_stop);
1295 return ret;
1296}
1297
1298/* this work func is triggerd by data ready. it reads until it can read no
1299 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1300 * our work the work struct will be marked and we'll be called again. */
David Howellsc4028952006-11-22 14:57:56 +00001301static void o2net_rx_until_empty(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001302{
David Howellsc4028952006-11-22 14:57:56 +00001303 struct o2net_sock_container *sc =
1304 container_of(work, struct o2net_sock_container, sc_rx_work);
Zach Brown98211482005-12-15 14:31:23 -08001305 int ret;
1306
1307 do {
1308 ret = o2net_advance_rx(sc);
1309 } while (ret > 0);
1310
1311 if (ret <= 0 && ret != -EAGAIN) {
1312 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1313 sclog(sc, "saw error %d, closing\n", ret);
1314 /* not permanent so read failed handshake can retry */
1315 o2net_ensure_shutdown(nn, sc, 0);
1316 }
1317
1318 sc_put(sc);
1319}
1320
1321static int o2net_set_nodelay(struct socket *sock)
1322{
1323 int ret, val = 1;
1324 mm_segment_t oldfs;
1325
1326 oldfs = get_fs();
1327 set_fs(KERNEL_DS);
1328
1329 /*
1330 * Dear unsuspecting programmer,
1331 *
1332 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1333 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1334 * silently turn into SO_DEBUG.
1335 *
1336 * Yours,
1337 * Keeper of hilariously fragile interfaces.
1338 */
1339 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1340 (char __user *)&val, sizeof(val));
1341
1342 set_fs(oldfs);
1343 return ret;
1344}
1345
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001346static void o2net_initialize_handshake(void)
1347{
1348 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1349 O2HB_MAX_WRITE_TIMEOUT_MS);
1350 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(
1351 o2net_idle_timeout(NULL));
1352 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1353 o2net_keepalive_delay(NULL));
1354 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1355 o2net_reconnect_delay(NULL));
1356}
1357
Zach Brown98211482005-12-15 14:31:23 -08001358/* ------------------------------------------------------------ */
1359
1360/* called when a connect completes and after a sock is accepted. the
1361 * rx path will see the response and mark the sc valid */
David Howellsc4028952006-11-22 14:57:56 +00001362static void o2net_sc_connect_completed(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001363{
David Howellsc4028952006-11-22 14:57:56 +00001364 struct o2net_sock_container *sc =
1365 container_of(work, struct o2net_sock_container,
1366 sc_connect_work);
Zach Brown98211482005-12-15 14:31:23 -08001367
1368 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1369 (unsigned long long)O2NET_PROTOCOL_VERSION,
1370 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1371
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001372 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001373 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1374 sc_put(sc);
1375}
1376
1377/* this is called as a work_struct func. */
David Howellsc4028952006-11-22 14:57:56 +00001378static void o2net_sc_send_keep_req(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001379{
David Howellsc4028952006-11-22 14:57:56 +00001380 struct o2net_sock_container *sc =
1381 container_of(work, struct o2net_sock_container,
1382 sc_keepalive_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001383
1384 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1385 sc_put(sc);
1386}
1387
1388/* socket shutdown does a del_timer_sync against this as it tears down.
1389 * we can't start this timer until we've got to the point in sc buildup
1390 * where shutdown is going to be involved */
1391static void o2net_idle_timer(unsigned long data)
1392{
1393 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
1394 struct timeval now;
1395
1396 do_gettimeofday(&now);
1397
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001398 printk(KERN_INFO "o2net: connection to " SC_NODEF_FMT " has been idle for %u.%u "
1399 "seconds, shutting it down.\n", SC_NODEF_ARGS(sc),
1400 o2net_idle_timeout(sc->sc_node) / 1000,
1401 o2net_idle_timeout(sc->sc_node) % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001402 mlog(ML_NOTICE, "here are some times that might help debug the "
1403 "situation: (tmr %ld.%ld now %ld.%ld dr %ld.%ld adv "
1404 "%ld.%ld:%ld.%ld func (%08x:%u) %ld.%ld:%ld.%ld)\n",
Mark Fasheh215c7f92006-02-01 16:42:10 -08001405 sc->sc_tv_timer.tv_sec, (long) sc->sc_tv_timer.tv_usec,
1406 now.tv_sec, (long) now.tv_usec,
1407 sc->sc_tv_data_ready.tv_sec, (long) sc->sc_tv_data_ready.tv_usec,
1408 sc->sc_tv_advance_start.tv_sec,
1409 (long) sc->sc_tv_advance_start.tv_usec,
1410 sc->sc_tv_advance_stop.tv_sec,
1411 (long) sc->sc_tv_advance_stop.tv_usec,
Zach Brown98211482005-12-15 14:31:23 -08001412 sc->sc_msg_key, sc->sc_msg_type,
Mark Fasheh215c7f92006-02-01 16:42:10 -08001413 sc->sc_tv_func_start.tv_sec, (long) sc->sc_tv_func_start.tv_usec,
1414 sc->sc_tv_func_stop.tv_sec, (long) sc->sc_tv_func_stop.tv_usec);
Zach Brown98211482005-12-15 14:31:23 -08001415
1416 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1417}
1418
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001419static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
Zach Brown98211482005-12-15 14:31:23 -08001420{
1421 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1422 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001423 msecs_to_jiffies(o2net_keepalive_delay(sc->sc_node)));
Zach Brown98211482005-12-15 14:31:23 -08001424 do_gettimeofday(&sc->sc_tv_timer);
1425 mod_timer(&sc->sc_idle_timeout,
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001426 jiffies + msecs_to_jiffies(o2net_idle_timeout(sc->sc_node)));
1427}
1428
1429static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1430{
1431 /* Only push out an existing timer */
1432 if (timer_pending(&sc->sc_idle_timeout))
1433 o2net_sc_reset_idle_timer(sc);
Zach Brown98211482005-12-15 14:31:23 -08001434}
1435
1436/* this work func is kicked whenever a path sets the nn state which doesn't
1437 * have valid set. This includes seeing hb come up, losing a connection,
1438 * having a connect attempt fail, etc. This centralizes the logic which decides
1439 * if a connect attempt should be made or if we should give up and all future
1440 * transmit attempts should fail */
David Howellsc4028952006-11-22 14:57:56 +00001441static void o2net_start_connect(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001442{
David Howellsc4028952006-11-22 14:57:56 +00001443 struct o2net_node *nn =
1444 container_of(work, struct o2net_node, nn_connect_work.work);
Zach Brown98211482005-12-15 14:31:23 -08001445 struct o2net_sock_container *sc = NULL;
Sunil Mushranb7668c72006-02-28 23:28:01 -08001446 struct o2nm_node *node = NULL, *mynode = NULL;
Zach Brown98211482005-12-15 14:31:23 -08001447 struct socket *sock = NULL;
1448 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
David Howellsc4028952006-11-22 14:57:56 +00001449 int ret = 0, stop;
Zach Brown98211482005-12-15 14:31:23 -08001450
1451 /* if we're greater we initiate tx, otherwise we accept */
1452 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1453 goto out;
1454
1455 /* watch for racing with tearing a node down */
1456 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1457 if (node == NULL) {
1458 ret = 0;
1459 goto out;
1460 }
1461
Sunil Mushranb7668c72006-02-28 23:28:01 -08001462 mynode = o2nm_get_node_by_num(o2nm_this_node());
1463 if (mynode == NULL) {
1464 ret = 0;
1465 goto out;
1466 }
1467
Zach Brown98211482005-12-15 14:31:23 -08001468 spin_lock(&nn->nn_lock);
1469 /* see if we already have one pending or have given up */
David Howellsc4028952006-11-22 14:57:56 +00001470 stop = (nn->nn_sc || nn->nn_persistent_error);
Zach Brown98211482005-12-15 14:31:23 -08001471 spin_unlock(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00001472 if (stop)
Zach Brown98211482005-12-15 14:31:23 -08001473 goto out;
1474
1475 nn->nn_last_connect_attempt = jiffies;
1476
1477 sc = sc_alloc(node);
1478 if (sc == NULL) {
1479 mlog(0, "couldn't allocate sc\n");
1480 ret = -ENOMEM;
1481 goto out;
1482 }
1483
1484 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1485 if (ret < 0) {
1486 mlog(0, "can't create socket: %d\n", ret);
1487 goto out;
1488 }
1489 sc->sc_sock = sock; /* freed by sc_kref_release */
1490
1491 sock->sk->sk_allocation = GFP_ATOMIC;
1492
1493 myaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001494 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
Zach Brown98211482005-12-15 14:31:23 -08001495 myaddr.sin_port = (__force u16)htons(0); /* any port */
1496
1497 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1498 sizeof(myaddr));
1499 if (ret) {
Sunil Mushranb7668c72006-02-28 23:28:01 -08001500 mlog(ML_ERROR, "bind failed with %d at address %u.%u.%u.%u\n",
1501 ret, NIPQUAD(mynode->nd_ipv4_address));
Zach Brown98211482005-12-15 14:31:23 -08001502 goto out;
1503 }
1504
1505 ret = o2net_set_nodelay(sc->sc_sock);
1506 if (ret) {
1507 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1508 goto out;
1509 }
1510
1511 o2net_register_callbacks(sc->sc_sock->sk, sc);
1512
1513 spin_lock(&nn->nn_lock);
1514 /* handshake completion will set nn->nn_sc_valid */
1515 o2net_set_nn_state(nn, sc, 0, 0);
1516 spin_unlock(&nn->nn_lock);
1517
1518 remoteaddr.sin_family = AF_INET;
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001519 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1520 remoteaddr.sin_port = node->nd_ipv4_port;
Zach Brown98211482005-12-15 14:31:23 -08001521
1522 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1523 (struct sockaddr *)&remoteaddr,
1524 sizeof(remoteaddr),
1525 O_NONBLOCK);
1526 if (ret == -EINPROGRESS)
1527 ret = 0;
1528
1529out:
1530 if (ret) {
1531 mlog(ML_NOTICE, "connect attempt to " SC_NODEF_FMT " failed "
1532 "with errno %d\n", SC_NODEF_ARGS(sc), ret);
1533 /* 0 err so that another will be queued and attempted
1534 * from set_nn_state */
1535 if (sc)
1536 o2net_ensure_shutdown(nn, sc, 0);
1537 }
1538 if (sc)
1539 sc_put(sc);
1540 if (node)
1541 o2nm_node_put(node);
Sunil Mushranb7668c72006-02-28 23:28:01 -08001542 if (mynode)
1543 o2nm_node_put(mynode);
Zach Brown98211482005-12-15 14:31:23 -08001544
1545 return;
1546}
1547
David Howellsc4028952006-11-22 14:57:56 +00001548static void o2net_connect_expired(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001549{
David Howellsc4028952006-11-22 14:57:56 +00001550 struct o2net_node *nn =
1551 container_of(work, struct o2net_node, nn_connect_expired.work);
Zach Brown98211482005-12-15 14:31:23 -08001552
1553 spin_lock(&nn->nn_lock);
1554 if (!nn->nn_sc_valid) {
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001555 struct o2nm_node *node = nn->nn_sc->sc_node;
Zach Brown98211482005-12-15 14:31:23 -08001556 mlog(ML_ERROR, "no connection established with node %u after "
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001557 "%u.%u seconds, giving up and returning errors.\n",
1558 o2net_num_from_nn(nn),
1559 o2net_idle_timeout(node) / 1000,
1560 o2net_idle_timeout(node) % 1000);
Zach Brown98211482005-12-15 14:31:23 -08001561
1562 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1563 }
1564 spin_unlock(&nn->nn_lock);
1565}
1566
David Howellsc4028952006-11-22 14:57:56 +00001567static void o2net_still_up(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001568{
David Howellsc4028952006-11-22 14:57:56 +00001569 struct o2net_node *nn =
1570 container_of(work, struct o2net_node, nn_still_up.work);
Zach Brown98211482005-12-15 14:31:23 -08001571
1572 o2quo_hb_still_up(o2net_num_from_nn(nn));
1573}
1574
1575/* ------------------------------------------------------------ */
1576
1577void o2net_disconnect_node(struct o2nm_node *node)
1578{
1579 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1580
1581 /* don't reconnect until it's heartbeating again */
1582 spin_lock(&nn->nn_lock);
1583 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1584 spin_unlock(&nn->nn_lock);
1585
1586 if (o2net_wq) {
1587 cancel_delayed_work(&nn->nn_connect_expired);
1588 cancel_delayed_work(&nn->nn_connect_work);
1589 cancel_delayed_work(&nn->nn_still_up);
1590 flush_workqueue(o2net_wq);
1591 }
1592}
1593
1594static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1595 void *data)
1596{
1597 o2quo_hb_down(node_num);
1598
1599 if (node_num != o2nm_this_node())
1600 o2net_disconnect_node(node);
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001601
1602 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
Zach Brown98211482005-12-15 14:31:23 -08001603}
1604
1605static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1606 void *data)
1607{
1608 struct o2net_node *nn = o2net_nn_from_num(node_num);
1609
1610 o2quo_hb_up(node_num);
1611
1612 /* ensure an immediate connect attempt */
1613 nn->nn_last_connect_attempt = jiffies -
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001614 (msecs_to_jiffies(o2net_reconnect_delay(node)) + 1);
Zach Brown98211482005-12-15 14:31:23 -08001615
1616 if (node_num != o2nm_this_node()) {
1617 /* heartbeat doesn't work unless a local node number is
1618 * configured and doing so brings up the o2net_wq, so we can
1619 * use it.. */
1620 queue_delayed_work(o2net_wq, &nn->nn_connect_expired,
Jeff Mahoneyb5dd8032006-12-04 14:04:54 +01001621 msecs_to_jiffies(o2net_idle_timeout(node)));
Zach Brown98211482005-12-15 14:31:23 -08001622
1623 /* believe it or not, accept and node hearbeating testing
1624 * can succeed for this node before we got here.. so
1625 * only use set_nn_state to clear the persistent error
1626 * if that hasn't already happened */
1627 spin_lock(&nn->nn_lock);
1628 if (nn->nn_persistent_error)
1629 o2net_set_nn_state(nn, NULL, 0, 0);
1630 spin_unlock(&nn->nn_lock);
1631 }
1632}
1633
1634void o2net_unregister_hb_callbacks(void)
1635{
Joel Becker14829422007-06-14 21:40:49 -07001636 o2hb_unregister_callback(NULL, &o2net_hb_up);
1637 o2hb_unregister_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001638}
1639
1640int o2net_register_hb_callbacks(void)
1641{
1642 int ret;
1643
1644 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1645 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1646 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1647 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1648
Joel Becker14829422007-06-14 21:40:49 -07001649 ret = o2hb_register_callback(NULL, &o2net_hb_up);
Zach Brown98211482005-12-15 14:31:23 -08001650 if (ret == 0)
Joel Becker14829422007-06-14 21:40:49 -07001651 ret = o2hb_register_callback(NULL, &o2net_hb_down);
Zach Brown98211482005-12-15 14:31:23 -08001652
1653 if (ret)
1654 o2net_unregister_hb_callbacks();
1655
1656 return ret;
1657}
1658
1659/* ------------------------------------------------------------ */
1660
1661static int o2net_accept_one(struct socket *sock)
1662{
1663 int ret, slen;
1664 struct sockaddr_in sin;
1665 struct socket *new_sock = NULL;
1666 struct o2nm_node *node = NULL;
1667 struct o2net_sock_container *sc = NULL;
1668 struct o2net_node *nn;
1669
1670 BUG_ON(sock == NULL);
1671 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1672 sock->sk->sk_protocol, &new_sock);
1673 if (ret)
1674 goto out;
1675
1676 new_sock->type = sock->type;
1677 new_sock->ops = sock->ops;
1678 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1679 if (ret < 0)
1680 goto out;
1681
1682 new_sock->sk->sk_allocation = GFP_ATOMIC;
1683
1684 ret = o2net_set_nodelay(new_sock);
1685 if (ret) {
1686 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1687 goto out;
1688 }
1689
1690 slen = sizeof(sin);
1691 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1692 &slen, 1);
1693 if (ret < 0)
1694 goto out;
1695
1696 node = o2nm_get_node_by_ip((__force __be32)sin.sin_addr.s_addr);
1697 if (node == NULL) {
1698 mlog(ML_NOTICE, "attempt to connect from unknown node at "
1699 "%u.%u.%u.%u:%d\n", NIPQUAD(sin.sin_addr.s_addr),
1700 ntohs((__force __be16)sin.sin_port));
1701 ret = -EINVAL;
1702 goto out;
1703 }
1704
1705 if (o2nm_this_node() > node->nd_num) {
1706 mlog(ML_NOTICE, "unexpected connect attempted from a lower "
1707 "numbered node '%s' at " "%u.%u.%u.%u:%d with num %u\n",
1708 node->nd_name, NIPQUAD(sin.sin_addr.s_addr),
1709 ntohs((__force __be16)sin.sin_port), node->nd_num);
1710 ret = -EINVAL;
1711 goto out;
1712 }
1713
1714 /* this happens all the time when the other node sees our heartbeat
1715 * and tries to connect before we see their heartbeat */
1716 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1717 mlog(ML_CONN, "attempt to connect from node '%s' at "
1718 "%u.%u.%u.%u:%d but it isn't heartbeating\n",
1719 node->nd_name, NIPQUAD(sin.sin_addr.s_addr),
1720 ntohs((__force __be16)sin.sin_port));
1721 ret = -EINVAL;
1722 goto out;
1723 }
1724
1725 nn = o2net_nn_from_num(node->nd_num);
1726
1727 spin_lock(&nn->nn_lock);
1728 if (nn->nn_sc)
1729 ret = -EBUSY;
1730 else
1731 ret = 0;
1732 spin_unlock(&nn->nn_lock);
1733 if (ret) {
1734 mlog(ML_NOTICE, "attempt to connect from node '%s' at "
1735 "%u.%u.%u.%u:%d but it already has an open connection\n",
1736 node->nd_name, NIPQUAD(sin.sin_addr.s_addr),
1737 ntohs((__force __be16)sin.sin_port));
1738 goto out;
1739 }
1740
1741 sc = sc_alloc(node);
1742 if (sc == NULL) {
1743 ret = -ENOMEM;
1744 goto out;
1745 }
1746
1747 sc->sc_sock = new_sock;
1748 new_sock = NULL;
1749
1750 spin_lock(&nn->nn_lock);
1751 o2net_set_nn_state(nn, sc, 0, 0);
1752 spin_unlock(&nn->nn_lock);
1753
1754 o2net_register_callbacks(sc->sc_sock->sk, sc);
1755 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1756
Andrew Beekhof828ae6a2006-12-04 14:04:55 +01001757 o2net_initialize_handshake();
Zach Brown98211482005-12-15 14:31:23 -08001758 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1759
1760out:
1761 if (new_sock)
1762 sock_release(new_sock);
1763 if (node)
1764 o2nm_node_put(node);
1765 if (sc)
1766 sc_put(sc);
1767 return ret;
1768}
1769
David Howellsc4028952006-11-22 14:57:56 +00001770static void o2net_accept_many(struct work_struct *work)
Zach Brown98211482005-12-15 14:31:23 -08001771{
David Howellsc4028952006-11-22 14:57:56 +00001772 struct socket *sock = o2net_listen_sock;
Zach Brown98211482005-12-15 14:31:23 -08001773 while (o2net_accept_one(sock) == 0)
1774 cond_resched();
1775}
1776
1777static void o2net_listen_data_ready(struct sock *sk, int bytes)
1778{
1779 void (*ready)(struct sock *sk, int bytes);
1780
1781 read_lock(&sk->sk_callback_lock);
1782 ready = sk->sk_user_data;
1783 if (ready == NULL) { /* check for teardown race */
1784 ready = sk->sk_data_ready;
1785 goto out;
1786 }
1787
1788 /* ->sk_data_ready is also called for a newly established child socket
1789 * before it has been accepted and the acceptor has set up their
1790 * data_ready.. we only want to queue listen work for our listening
1791 * socket */
1792 if (sk->sk_state == TCP_LISTEN) {
1793 mlog(ML_TCP, "bytes: %d\n", bytes);
1794 queue_work(o2net_wq, &o2net_listen_work);
1795 }
1796
1797out:
1798 read_unlock(&sk->sk_callback_lock);
1799 ready(sk, bytes);
1800}
1801
Sunil Mushranab81afd2007-01-29 14:57:14 -08001802static int o2net_open_listening_sock(__be32 addr, __be16 port)
Zach Brown98211482005-12-15 14:31:23 -08001803{
1804 struct socket *sock = NULL;
1805 int ret;
1806 struct sockaddr_in sin = {
1807 .sin_family = PF_INET,
Mark Fasheh5fdf1e62007-04-27 16:50:03 -07001808 .sin_addr = { .s_addr = addr },
1809 .sin_port = port,
Zach Brown98211482005-12-15 14:31:23 -08001810 };
1811
1812 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1813 if (ret < 0) {
1814 mlog(ML_ERROR, "unable to create socket, ret=%d\n", ret);
1815 goto out;
1816 }
1817
1818 sock->sk->sk_allocation = GFP_ATOMIC;
1819
1820 write_lock_bh(&sock->sk->sk_callback_lock);
1821 sock->sk->sk_user_data = sock->sk->sk_data_ready;
1822 sock->sk->sk_data_ready = o2net_listen_data_ready;
1823 write_unlock_bh(&sock->sk->sk_callback_lock);
1824
1825 o2net_listen_sock = sock;
David Howellsc4028952006-11-22 14:57:56 +00001826 INIT_WORK(&o2net_listen_work, o2net_accept_many);
Zach Brown98211482005-12-15 14:31:23 -08001827
1828 sock->sk->sk_reuse = 1;
1829 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
1830 if (ret < 0) {
Sunil Mushranab81afd2007-01-29 14:57:14 -08001831 mlog(ML_ERROR, "unable to bind socket at %u.%u.%u.%u:%u, "
1832 "ret=%d\n", NIPQUAD(addr), ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08001833 goto out;
1834 }
1835
1836 ret = sock->ops->listen(sock, 64);
1837 if (ret < 0) {
Sunil Mushranab81afd2007-01-29 14:57:14 -08001838 mlog(ML_ERROR, "unable to listen on %u.%u.%u.%u:%u, ret=%d\n",
1839 NIPQUAD(addr), ntohs(port), ret);
Zach Brown98211482005-12-15 14:31:23 -08001840 }
1841
1842out:
1843 if (ret) {
1844 o2net_listen_sock = NULL;
1845 if (sock)
1846 sock_release(sock);
1847 }
1848 return ret;
1849}
1850
1851/*
1852 * called from node manager when we should bring up our network listening
1853 * socket. node manager handles all the serialization to only call this
1854 * once and to match it with o2net_stop_listening(). note,
1855 * o2nm_this_node() doesn't work yet as we're being called while it
1856 * is being set up.
1857 */
1858int o2net_start_listening(struct o2nm_node *node)
1859{
1860 int ret = 0;
1861
1862 BUG_ON(o2net_wq != NULL);
1863 BUG_ON(o2net_listen_sock != NULL);
1864
1865 mlog(ML_KTHREAD, "starting o2net thread...\n");
1866 o2net_wq = create_singlethread_workqueue("o2net");
1867 if (o2net_wq == NULL) {
1868 mlog(ML_ERROR, "unable to launch o2net thread\n");
1869 return -ENOMEM; /* ? */
1870 }
1871
Sunil Mushranab81afd2007-01-29 14:57:14 -08001872 ret = o2net_open_listening_sock(node->nd_ipv4_address,
1873 node->nd_ipv4_port);
Zach Brown98211482005-12-15 14:31:23 -08001874 if (ret) {
1875 destroy_workqueue(o2net_wq);
1876 o2net_wq = NULL;
1877 } else
1878 o2quo_conn_up(node->nd_num);
1879
1880 return ret;
1881}
1882
1883/* again, o2nm_this_node() doesn't work here as we're involved in
1884 * tearing it down */
1885void o2net_stop_listening(struct o2nm_node *node)
1886{
1887 struct socket *sock = o2net_listen_sock;
1888 size_t i;
1889
1890 BUG_ON(o2net_wq == NULL);
1891 BUG_ON(o2net_listen_sock == NULL);
1892
1893 /* stop the listening socket from generating work */
1894 write_lock_bh(&sock->sk->sk_callback_lock);
1895 sock->sk->sk_data_ready = sock->sk->sk_user_data;
1896 sock->sk->sk_user_data = NULL;
1897 write_unlock_bh(&sock->sk->sk_callback_lock);
1898
1899 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
1900 struct o2nm_node *node = o2nm_get_node_by_num(i);
1901 if (node) {
1902 o2net_disconnect_node(node);
1903 o2nm_node_put(node);
1904 }
1905 }
1906
1907 /* finish all work and tear down the work queue */
1908 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
1909 destroy_workqueue(o2net_wq);
1910 o2net_wq = NULL;
1911
1912 sock_release(o2net_listen_sock);
1913 o2net_listen_sock = NULL;
1914
1915 o2quo_conn_err(node->nd_num);
1916}
1917
1918/* ------------------------------------------------------------ */
1919
1920int o2net_init(void)
1921{
1922 unsigned long i;
1923
1924 o2quo_init();
1925
Robert P. J. Daycd861282006-12-13 00:34:52 -08001926 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
1927 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
1928 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
Zach Brown98211482005-12-15 14:31:23 -08001929 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) {
1930 kfree(o2net_hand);
1931 kfree(o2net_keep_req);
1932 kfree(o2net_keep_resp);
1933 return -ENOMEM;
1934 }
1935
1936 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
1937 o2net_hand->connector_id = cpu_to_be64(1);
1938
1939 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
1940 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
1941
1942 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
1943 struct o2net_node *nn = o2net_nn_from_num(i);
1944
1945 spin_lock_init(&nn->nn_lock);
David Howellsc4028952006-11-22 14:57:56 +00001946 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
1947 INIT_DELAYED_WORK(&nn->nn_connect_expired,
1948 o2net_connect_expired);
1949 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
Zach Brown98211482005-12-15 14:31:23 -08001950 /* until we see hb from a node we'll return einval */
1951 nn->nn_persistent_error = -ENOTCONN;
1952 init_waitqueue_head(&nn->nn_sc_wq);
1953 idr_init(&nn->nn_status_idr);
1954 INIT_LIST_HEAD(&nn->nn_status_list);
1955 }
1956
1957 return 0;
1958}
1959
1960void o2net_exit(void)
1961{
1962 o2quo_exit();
1963 kfree(o2net_hand);
1964 kfree(o2net_keep_req);
1965 kfree(o2net_keep_resp);
1966}