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1/* -*- 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 <linux/net.h>
62#include <linux/export.h>
63#include <net/tcp.h>
64
65#include <asm/uaccess.h>
66
67#include "heartbeat.h"
68#include "tcp.h"
69#include "nodemanager.h"
70#define MLOG_MASK_PREFIX ML_TCP
71#include "masklog.h"
72#include "quorum.h"
73
74#include "tcp_internal.h"
75
76#define SC_NODEF_FMT "node %s (num %u) at %pI4:%u"
77#define SC_NODEF_ARGS(sc) sc->sc_node->nd_name, sc->sc_node->nd_num, \
78 &sc->sc_node->nd_ipv4_address, \
79 ntohs(sc->sc_node->nd_ipv4_port)
80
81/*
82 * In the following two log macros, the whitespace after the ',' just
83 * before ##args is intentional. Otherwise, gcc 2.95 will eat the
84 * previous token if args expands to nothing.
85 */
86#define msglog(hdr, fmt, args...) do { \
87 typeof(hdr) __hdr = (hdr); \
88 mlog(ML_MSG, "[mag %u len %u typ %u stat %d sys_stat %d " \
89 "key %08x num %u] " fmt, \
90 be16_to_cpu(__hdr->magic), be16_to_cpu(__hdr->data_len), \
91 be16_to_cpu(__hdr->msg_type), be32_to_cpu(__hdr->status), \
92 be32_to_cpu(__hdr->sys_status), be32_to_cpu(__hdr->key), \
93 be32_to_cpu(__hdr->msg_num) , ##args); \
94} while (0)
95
96#define sclog(sc, fmt, args...) do { \
97 typeof(sc) __sc = (sc); \
98 mlog(ML_SOCKET, "[sc %p refs %d sock %p node %u page %p " \
99 "pg_off %zu] " fmt, __sc, \
100 atomic_read(&__sc->sc_kref.refcount), __sc->sc_sock, \
101 __sc->sc_node->nd_num, __sc->sc_page, __sc->sc_page_off , \
102 ##args); \
103} while (0)
104
105static DEFINE_RWLOCK(o2net_handler_lock);
106static struct rb_root o2net_handler_tree = RB_ROOT;
107
108static struct o2net_node o2net_nodes[O2NM_MAX_NODES];
109
110/* XXX someday we'll need better accounting */
111static struct socket *o2net_listen_sock = NULL;
112
113/*
114 * listen work is only queued by the listening socket callbacks on the
115 * o2net_wq. teardown detaches the callbacks before destroying the workqueue.
116 * quorum work is queued as sock containers are shutdown.. stop_listening
117 * tears down all the node's sock containers, preventing future shutdowns
118 * and queued quroum work, before canceling delayed quorum work and
119 * destroying the work queue.
120 */
121static struct workqueue_struct *o2net_wq;
122static struct work_struct o2net_listen_work;
123
124static struct o2hb_callback_func o2net_hb_up, o2net_hb_down;
125#define O2NET_HB_PRI 0x1
126
127static struct o2net_handshake *o2net_hand;
128static struct o2net_msg *o2net_keep_req, *o2net_keep_resp;
129
130static int o2net_sys_err_translations[O2NET_ERR_MAX] =
131 {[O2NET_ERR_NONE] = 0,
132 [O2NET_ERR_NO_HNDLR] = -ENOPROTOOPT,
133 [O2NET_ERR_OVERFLOW] = -EOVERFLOW,
134 [O2NET_ERR_DIED] = -EHOSTDOWN,};
135
136/* can't quite avoid *all* internal declarations :/ */
137static void o2net_sc_connect_completed(struct work_struct *work);
138static void o2net_rx_until_empty(struct work_struct *work);
139static void o2net_shutdown_sc(struct work_struct *work);
140static void o2net_listen_data_ready(struct sock *sk, int bytes);
141static void o2net_sc_send_keep_req(struct work_struct *work);
142static void o2net_idle_timer(unsigned long data);
143static void o2net_sc_postpone_idle(struct o2net_sock_container *sc);
144static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc);
145
146#ifdef CONFIG_DEBUG_FS
147static void o2net_init_nst(struct o2net_send_tracking *nst, u32 msgtype,
148 u32 msgkey, struct task_struct *task, u8 node)
149{
150 INIT_LIST_HEAD(&nst->st_net_debug_item);
151 nst->st_task = task;
152 nst->st_msg_type = msgtype;
153 nst->st_msg_key = msgkey;
154 nst->st_node = node;
155}
156
157static inline void o2net_set_nst_sock_time(struct o2net_send_tracking *nst)
158{
159 nst->st_sock_time = ktime_get();
160}
161
162static inline void o2net_set_nst_send_time(struct o2net_send_tracking *nst)
163{
164 nst->st_send_time = ktime_get();
165}
166
167static inline void o2net_set_nst_status_time(struct o2net_send_tracking *nst)
168{
169 nst->st_status_time = ktime_get();
170}
171
172static inline void o2net_set_nst_sock_container(struct o2net_send_tracking *nst,
173 struct o2net_sock_container *sc)
174{
175 nst->st_sc = sc;
176}
177
178static inline void o2net_set_nst_msg_id(struct o2net_send_tracking *nst,
179 u32 msg_id)
180{
181 nst->st_id = msg_id;
182}
183
184static inline void o2net_set_sock_timer(struct o2net_sock_container *sc)
185{
186 sc->sc_tv_timer = ktime_get();
187}
188
189static inline void o2net_set_data_ready_time(struct o2net_sock_container *sc)
190{
191 sc->sc_tv_data_ready = ktime_get();
192}
193
194static inline void o2net_set_advance_start_time(struct o2net_sock_container *sc)
195{
196 sc->sc_tv_advance_start = ktime_get();
197}
198
199static inline void o2net_set_advance_stop_time(struct o2net_sock_container *sc)
200{
201 sc->sc_tv_advance_stop = ktime_get();
202}
203
204static inline void o2net_set_func_start_time(struct o2net_sock_container *sc)
205{
206 sc->sc_tv_func_start = ktime_get();
207}
208
209static inline void o2net_set_func_stop_time(struct o2net_sock_container *sc)
210{
211 sc->sc_tv_func_stop = ktime_get();
212}
213
214#else /* CONFIG_DEBUG_FS */
215# define o2net_init_nst(a, b, c, d, e)
216# define o2net_set_nst_sock_time(a)
217# define o2net_set_nst_send_time(a)
218# define o2net_set_nst_status_time(a)
219# define o2net_set_nst_sock_container(a, b)
220# define o2net_set_nst_msg_id(a, b)
221# define o2net_set_sock_timer(a)
222# define o2net_set_data_ready_time(a)
223# define o2net_set_advance_start_time(a)
224# define o2net_set_advance_stop_time(a)
225# define o2net_set_func_start_time(a)
226# define o2net_set_func_stop_time(a)
227#endif /* CONFIG_DEBUG_FS */
228
229#ifdef CONFIG_OCFS2_FS_STATS
230static ktime_t o2net_get_func_run_time(struct o2net_sock_container *sc)
231{
232 return ktime_sub(sc->sc_tv_func_stop, sc->sc_tv_func_start);
233}
234
235static void o2net_update_send_stats(struct o2net_send_tracking *nst,
236 struct o2net_sock_container *sc)
237{
238 sc->sc_tv_status_total = ktime_add(sc->sc_tv_status_total,
239 ktime_sub(ktime_get(),
240 nst->st_status_time));
241 sc->sc_tv_send_total = ktime_add(sc->sc_tv_send_total,
242 ktime_sub(nst->st_status_time,
243 nst->st_send_time));
244 sc->sc_tv_acquiry_total = ktime_add(sc->sc_tv_acquiry_total,
245 ktime_sub(nst->st_send_time,
246 nst->st_sock_time));
247 sc->sc_send_count++;
248}
249
250static void o2net_update_recv_stats(struct o2net_sock_container *sc)
251{
252 sc->sc_tv_process_total = ktime_add(sc->sc_tv_process_total,
253 o2net_get_func_run_time(sc));
254 sc->sc_recv_count++;
255}
256
257#else
258
259# define o2net_update_send_stats(a, b)
260
261# define o2net_update_recv_stats(sc)
262
263#endif /* CONFIG_OCFS2_FS_STATS */
264
265static inline int o2net_reconnect_delay(void)
266{
267 return o2nm_single_cluster->cl_reconnect_delay_ms;
268}
269
270static inline int o2net_keepalive_delay(void)
271{
272 return o2nm_single_cluster->cl_keepalive_delay_ms;
273}
274
275static inline int o2net_idle_timeout(void)
276{
277 return o2nm_single_cluster->cl_idle_timeout_ms;
278}
279
280static inline int o2net_sys_err_to_errno(enum o2net_system_error err)
281{
282 int trans;
283 BUG_ON(err >= O2NET_ERR_MAX);
284 trans = o2net_sys_err_translations[err];
285
286 /* Just in case we mess up the translation table above */
287 BUG_ON(err != O2NET_ERR_NONE && trans == 0);
288 return trans;
289}
290
291static struct o2net_node * o2net_nn_from_num(u8 node_num)
292{
293 BUG_ON(node_num >= ARRAY_SIZE(o2net_nodes));
294 return &o2net_nodes[node_num];
295}
296
297static u8 o2net_num_from_nn(struct o2net_node *nn)
298{
299 BUG_ON(nn == NULL);
300 return nn - o2net_nodes;
301}
302
303/* ------------------------------------------------------------ */
304
305static int o2net_prep_nsw(struct o2net_node *nn, struct o2net_status_wait *nsw)
306{
307 int ret = 0;
308
309 do {
310 if (!idr_pre_get(&nn->nn_status_idr, GFP_ATOMIC)) {
311 ret = -EAGAIN;
312 break;
313 }
314 spin_lock(&nn->nn_lock);
315 ret = idr_get_new(&nn->nn_status_idr, nsw, &nsw->ns_id);
316 if (ret == 0)
317 list_add_tail(&nsw->ns_node_item,
318 &nn->nn_status_list);
319 spin_unlock(&nn->nn_lock);
320 } while (ret == -EAGAIN);
321
322 if (ret == 0) {
323 init_waitqueue_head(&nsw->ns_wq);
324 nsw->ns_sys_status = O2NET_ERR_NONE;
325 nsw->ns_status = 0;
326 }
327
328 return ret;
329}
330
331static void o2net_complete_nsw_locked(struct o2net_node *nn,
332 struct o2net_status_wait *nsw,
333 enum o2net_system_error sys_status,
334 s32 status)
335{
336 assert_spin_locked(&nn->nn_lock);
337
338 if (!list_empty(&nsw->ns_node_item)) {
339 list_del_init(&nsw->ns_node_item);
340 nsw->ns_sys_status = sys_status;
341 nsw->ns_status = status;
342 idr_remove(&nn->nn_status_idr, nsw->ns_id);
343 wake_up(&nsw->ns_wq);
344 }
345}
346
347static void o2net_complete_nsw(struct o2net_node *nn,
348 struct o2net_status_wait *nsw,
349 u64 id, enum o2net_system_error sys_status,
350 s32 status)
351{
352 spin_lock(&nn->nn_lock);
353 if (nsw == NULL) {
354 if (id > INT_MAX)
355 goto out;
356
357 nsw = idr_find(&nn->nn_status_idr, id);
358 if (nsw == NULL)
359 goto out;
360 }
361
362 o2net_complete_nsw_locked(nn, nsw, sys_status, status);
363
364out:
365 spin_unlock(&nn->nn_lock);
366 return;
367}
368
369static void o2net_complete_nodes_nsw(struct o2net_node *nn)
370{
371 struct o2net_status_wait *nsw, *tmp;
372 unsigned int num_kills = 0;
373
374 assert_spin_locked(&nn->nn_lock);
375
376 list_for_each_entry_safe(nsw, tmp, &nn->nn_status_list, ns_node_item) {
377 o2net_complete_nsw_locked(nn, nsw, O2NET_ERR_DIED, 0);
378 num_kills++;
379 }
380
381 mlog(0, "completed %d messages for node %u\n", num_kills,
382 o2net_num_from_nn(nn));
383}
384
385static int o2net_nsw_completed(struct o2net_node *nn,
386 struct o2net_status_wait *nsw)
387{
388 int completed;
389 spin_lock(&nn->nn_lock);
390 completed = list_empty(&nsw->ns_node_item);
391 spin_unlock(&nn->nn_lock);
392 return completed;
393}
394
395/* ------------------------------------------------------------ */
396
397static void sc_kref_release(struct kref *kref)
398{
399 struct o2net_sock_container *sc = container_of(kref,
400 struct o2net_sock_container, sc_kref);
401 BUG_ON(timer_pending(&sc->sc_idle_timeout));
402
403 sclog(sc, "releasing\n");
404
405 if (sc->sc_sock) {
406 sock_release(sc->sc_sock);
407 sc->sc_sock = NULL;
408 }
409
410 o2nm_undepend_item(&sc->sc_node->nd_item);
411 o2nm_node_put(sc->sc_node);
412 sc->sc_node = NULL;
413
414 o2net_debug_del_sc(sc);
415 kfree(sc);
416}
417
418static void sc_put(struct o2net_sock_container *sc)
419{
420 sclog(sc, "put\n");
421 kref_put(&sc->sc_kref, sc_kref_release);
422}
423static void sc_get(struct o2net_sock_container *sc)
424{
425 sclog(sc, "get\n");
426 kref_get(&sc->sc_kref);
427}
428static struct o2net_sock_container *sc_alloc(struct o2nm_node *node)
429{
430 struct o2net_sock_container *sc, *ret = NULL;
431 struct page *page = NULL;
432 int status = 0;
433
434 page = alloc_page(GFP_NOFS);
435 sc = kzalloc(sizeof(*sc), GFP_NOFS);
436 if (sc == NULL || page == NULL)
437 goto out;
438
439 kref_init(&sc->sc_kref);
440 o2nm_node_get(node);
441 sc->sc_node = node;
442
443 /* pin the node item of the remote node */
444 status = o2nm_depend_item(&node->nd_item);
445 if (status) {
446 mlog_errno(status);
447 o2nm_node_put(node);
448 goto out;
449 }
450 INIT_WORK(&sc->sc_connect_work, o2net_sc_connect_completed);
451 INIT_WORK(&sc->sc_rx_work, o2net_rx_until_empty);
452 INIT_WORK(&sc->sc_shutdown_work, o2net_shutdown_sc);
453 INIT_DELAYED_WORK(&sc->sc_keepalive_work, o2net_sc_send_keep_req);
454
455 init_timer(&sc->sc_idle_timeout);
456 sc->sc_idle_timeout.function = o2net_idle_timer;
457 sc->sc_idle_timeout.data = (unsigned long)sc;
458
459 sclog(sc, "alloced\n");
460
461 ret = sc;
462 sc->sc_page = page;
463 o2net_debug_add_sc(sc);
464 sc = NULL;
465 page = NULL;
466
467out:
468 if (page)
469 __free_page(page);
470 kfree(sc);
471
472 return ret;
473}
474
475/* ------------------------------------------------------------ */
476
477static void o2net_sc_queue_work(struct o2net_sock_container *sc,
478 struct work_struct *work)
479{
480 sc_get(sc);
481 if (!queue_work(o2net_wq, work))
482 sc_put(sc);
483}
484static void o2net_sc_queue_delayed_work(struct o2net_sock_container *sc,
485 struct delayed_work *work,
486 int delay)
487{
488 sc_get(sc);
489 if (!queue_delayed_work(o2net_wq, work, delay))
490 sc_put(sc);
491}
492static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
493 struct delayed_work *work)
494{
495 if (cancel_delayed_work(work))
496 sc_put(sc);
497}
498
499static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
500
501int o2net_num_connected_peers(void)
502{
503 return atomic_read(&o2net_connected_peers);
504}
505
506static void o2net_set_nn_state(struct o2net_node *nn,
507 struct o2net_sock_container *sc,
508 unsigned valid, int err)
509{
510 int was_valid = nn->nn_sc_valid;
511 int was_err = nn->nn_persistent_error;
512 struct o2net_sock_container *old_sc = nn->nn_sc;
513
514 assert_spin_locked(&nn->nn_lock);
515
516 if (old_sc && !sc)
517 atomic_dec(&o2net_connected_peers);
518 else if (!old_sc && sc)
519 atomic_inc(&o2net_connected_peers);
520
521 /* the node num comparison and single connect/accept path should stop
522 * an non-null sc from being overwritten with another */
523 BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
524 mlog_bug_on_msg(err && valid, "err %d valid %u\n", err, valid);
525 mlog_bug_on_msg(valid && !sc, "valid %u sc %p\n", valid, sc);
526
527 if (was_valid && !valid && err == 0)
528 err = -ENOTCONN;
529
530 mlog(ML_CONN, "node %u sc: %p -> %p, valid %u -> %u, err %d -> %d\n",
531 o2net_num_from_nn(nn), nn->nn_sc, sc, nn->nn_sc_valid, valid,
532 nn->nn_persistent_error, err);
533
534 nn->nn_sc = sc;
535 nn->nn_sc_valid = valid ? 1 : 0;
536 nn->nn_persistent_error = err;
537
538 /* mirrors o2net_tx_can_proceed() */
539 if (nn->nn_persistent_error || nn->nn_sc_valid)
540 wake_up(&nn->nn_sc_wq);
541
542 if (!was_err && nn->nn_persistent_error) {
543 o2quo_conn_err(o2net_num_from_nn(nn));
544 queue_delayed_work(o2net_wq, &nn->nn_still_up,
545 msecs_to_jiffies(O2NET_QUORUM_DELAY_MS));
546 }
547
548 if (was_valid && !valid) {
549 printk(KERN_NOTICE "o2net: No longer connected to "
550 SC_NODEF_FMT "\n", SC_NODEF_ARGS(old_sc));
551 o2net_complete_nodes_nsw(nn);
552 }
553
554 if (!was_valid && valid) {
555 o2quo_conn_up(o2net_num_from_nn(nn));
556 cancel_delayed_work(&nn->nn_connect_expired);
557 printk(KERN_NOTICE "o2net: %s " SC_NODEF_FMT "\n",
558 o2nm_this_node() > sc->sc_node->nd_num ?
559 "Connected to" : "Accepted connection from",
560 SC_NODEF_ARGS(sc));
561 }
562
563 /* trigger the connecting worker func as long as we're not valid,
564 * it will back off if it shouldn't connect. This can be called
565 * from node config teardown and so needs to be careful about
566 * the work queue actually being up. */
567 if (!valid && o2net_wq) {
568 unsigned long delay;
569 /* delay if we're within a RECONNECT_DELAY of the
570 * last attempt */
571 delay = (nn->nn_last_connect_attempt +
572 msecs_to_jiffies(o2net_reconnect_delay()))
573 - jiffies;
574 if (delay > msecs_to_jiffies(o2net_reconnect_delay()))
575 delay = 0;
576 mlog(ML_CONN, "queueing conn attempt in %lu jiffies\n", delay);
577 queue_delayed_work(o2net_wq, &nn->nn_connect_work, delay);
578
579 /*
580 * Delay the expired work after idle timeout.
581 *
582 * We might have lots of failed connection attempts that run
583 * through here but we only cancel the connect_expired work when
584 * a connection attempt succeeds. So only the first enqueue of
585 * the connect_expired work will do anything. The rest will see
586 * that it's already queued and do nothing.
587 */
588 delay += msecs_to_jiffies(o2net_idle_timeout());
589 queue_delayed_work(o2net_wq, &nn->nn_connect_expired, delay);
590 }
591
592 /* keep track of the nn's sc ref for the caller */
593 if ((old_sc == NULL) && sc)
594 sc_get(sc);
595 if (old_sc && (old_sc != sc)) {
596 o2net_sc_queue_work(old_sc, &old_sc->sc_shutdown_work);
597 sc_put(old_sc);
598 }
599}
600
601/* see o2net_register_callbacks() */
602static void o2net_data_ready(struct sock *sk, int bytes)
603{
604 void (*ready)(struct sock *sk, int bytes);
605
606 read_lock(&sk->sk_callback_lock);
607 if (sk->sk_user_data) {
608 struct o2net_sock_container *sc = sk->sk_user_data;
609 sclog(sc, "data_ready hit\n");
610 o2net_set_data_ready_time(sc);
611 o2net_sc_queue_work(sc, &sc->sc_rx_work);
612 ready = sc->sc_data_ready;
613 } else {
614 ready = sk->sk_data_ready;
615 }
616 read_unlock(&sk->sk_callback_lock);
617
618 ready(sk, bytes);
619}
620
621/* see o2net_register_callbacks() */
622static void o2net_state_change(struct sock *sk)
623{
624 void (*state_change)(struct sock *sk);
625 struct o2net_sock_container *sc;
626
627 read_lock(&sk->sk_callback_lock);
628 sc = sk->sk_user_data;
629 if (sc == NULL) {
630 state_change = sk->sk_state_change;
631 goto out;
632 }
633
634 sclog(sc, "state_change to %d\n", sk->sk_state);
635
636 state_change = sc->sc_state_change;
637
638 switch(sk->sk_state) {
639 /* ignore connecting sockets as they make progress */
640 case TCP_SYN_SENT:
641 case TCP_SYN_RECV:
642 break;
643 case TCP_ESTABLISHED:
644 o2net_sc_queue_work(sc, &sc->sc_connect_work);
645 break;
646 default:
647 printk(KERN_INFO "o2net: Connection to " SC_NODEF_FMT
648 " shutdown, state %d\n",
649 SC_NODEF_ARGS(sc), sk->sk_state);
650 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
651 break;
652 }
653out:
654 read_unlock(&sk->sk_callback_lock);
655 state_change(sk);
656}
657
658/*
659 * we register callbacks so we can queue work on events before calling
660 * the original callbacks. our callbacks our careful to test user_data
661 * to discover when they've reaced with o2net_unregister_callbacks().
662 */
663static void o2net_register_callbacks(struct sock *sk,
664 struct o2net_sock_container *sc)
665{
666 write_lock_bh(&sk->sk_callback_lock);
667
668 /* accepted sockets inherit the old listen socket data ready */
669 if (sk->sk_data_ready == o2net_listen_data_ready) {
670 sk->sk_data_ready = sk->sk_user_data;
671 sk->sk_user_data = NULL;
672 }
673
674 BUG_ON(sk->sk_user_data != NULL);
675 sk->sk_user_data = sc;
676 sc_get(sc);
677
678 sc->sc_data_ready = sk->sk_data_ready;
679 sc->sc_state_change = sk->sk_state_change;
680 sk->sk_data_ready = o2net_data_ready;
681 sk->sk_state_change = o2net_state_change;
682
683 mutex_init(&sc->sc_send_lock);
684
685 write_unlock_bh(&sk->sk_callback_lock);
686}
687
688static int o2net_unregister_callbacks(struct sock *sk,
689 struct o2net_sock_container *sc)
690{
691 int ret = 0;
692
693 write_lock_bh(&sk->sk_callback_lock);
694 if (sk->sk_user_data == sc) {
695 ret = 1;
696 sk->sk_user_data = NULL;
697 sk->sk_data_ready = sc->sc_data_ready;
698 sk->sk_state_change = sc->sc_state_change;
699 }
700 write_unlock_bh(&sk->sk_callback_lock);
701
702 return ret;
703}
704
705/*
706 * this is a little helper that is called by callers who have seen a problem
707 * with an sc and want to detach it from the nn if someone already hasn't beat
708 * them to it. if an error is given then the shutdown will be persistent
709 * and pending transmits will be canceled.
710 */
711static void o2net_ensure_shutdown(struct o2net_node *nn,
712 struct o2net_sock_container *sc,
713 int err)
714{
715 spin_lock(&nn->nn_lock);
716 if (nn->nn_sc == sc)
717 o2net_set_nn_state(nn, NULL, 0, err);
718 spin_unlock(&nn->nn_lock);
719}
720
721/*
722 * This work queue function performs the blocking parts of socket shutdown. A
723 * few paths lead here. set_nn_state will trigger this callback if it sees an
724 * sc detached from the nn. state_change will also trigger this callback
725 * directly when it sees errors. In that case we need to call set_nn_state
726 * ourselves as state_change couldn't get the nn_lock and call set_nn_state
727 * itself.
728 */
729static void o2net_shutdown_sc(struct work_struct *work)
730{
731 struct o2net_sock_container *sc =
732 container_of(work, struct o2net_sock_container,
733 sc_shutdown_work);
734 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
735
736 sclog(sc, "shutting down\n");
737
738 /* drop the callbacks ref and call shutdown only once */
739 if (o2net_unregister_callbacks(sc->sc_sock->sk, sc)) {
740 /* we shouldn't flush as we're in the thread, the
741 * races with pending sc work structs are harmless */
742 del_timer_sync(&sc->sc_idle_timeout);
743 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
744 sc_put(sc);
745 kernel_sock_shutdown(sc->sc_sock, SHUT_RDWR);
746 }
747
748 /* not fatal so failed connects before the other guy has our
749 * heartbeat can be retried */
750 o2net_ensure_shutdown(nn, sc, 0);
751 sc_put(sc);
752}
753
754/* ------------------------------------------------------------ */
755
756static int o2net_handler_cmp(struct o2net_msg_handler *nmh, u32 msg_type,
757 u32 key)
758{
759 int ret = memcmp(&nmh->nh_key, &key, sizeof(key));
760
761 if (ret == 0)
762 ret = memcmp(&nmh->nh_msg_type, &msg_type, sizeof(msg_type));
763
764 return ret;
765}
766
767static struct o2net_msg_handler *
768o2net_handler_tree_lookup(u32 msg_type, u32 key, struct rb_node ***ret_p,
769 struct rb_node **ret_parent)
770{
771 struct rb_node **p = &o2net_handler_tree.rb_node;
772 struct rb_node *parent = NULL;
773 struct o2net_msg_handler *nmh, *ret = NULL;
774 int cmp;
775
776 while (*p) {
777 parent = *p;
778 nmh = rb_entry(parent, struct o2net_msg_handler, nh_node);
779 cmp = o2net_handler_cmp(nmh, msg_type, key);
780
781 if (cmp < 0)
782 p = &(*p)->rb_left;
783 else if (cmp > 0)
784 p = &(*p)->rb_right;
785 else {
786 ret = nmh;
787 break;
788 }
789 }
790
791 if (ret_p != NULL)
792 *ret_p = p;
793 if (ret_parent != NULL)
794 *ret_parent = parent;
795
796 return ret;
797}
798
799static void o2net_handler_kref_release(struct kref *kref)
800{
801 struct o2net_msg_handler *nmh;
802 nmh = container_of(kref, struct o2net_msg_handler, nh_kref);
803
804 kfree(nmh);
805}
806
807static void o2net_handler_put(struct o2net_msg_handler *nmh)
808{
809 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
810}
811
812/* max_len is protection for the handler func. incoming messages won't
813 * be given to the handler if their payload is longer than the max. */
814int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
815 o2net_msg_handler_func *func, void *data,
816 o2net_post_msg_handler_func *post_func,
817 struct list_head *unreg_list)
818{
819 struct o2net_msg_handler *nmh = NULL;
820 struct rb_node **p, *parent;
821 int ret = 0;
822
823 if (max_len > O2NET_MAX_PAYLOAD_BYTES) {
824 mlog(0, "max_len for message handler out of range: %u\n",
825 max_len);
826 ret = -EINVAL;
827 goto out;
828 }
829
830 if (!msg_type) {
831 mlog(0, "no message type provided: %u, %p\n", msg_type, func);
832 ret = -EINVAL;
833 goto out;
834
835 }
836 if (!func) {
837 mlog(0, "no message handler provided: %u, %p\n",
838 msg_type, func);
839 ret = -EINVAL;
840 goto out;
841 }
842
843 nmh = kzalloc(sizeof(struct o2net_msg_handler), GFP_NOFS);
844 if (nmh == NULL) {
845 ret = -ENOMEM;
846 goto out;
847 }
848
849 nmh->nh_func = func;
850 nmh->nh_func_data = data;
851 nmh->nh_post_func = post_func;
852 nmh->nh_msg_type = msg_type;
853 nmh->nh_max_len = max_len;
854 nmh->nh_key = key;
855 /* the tree and list get this ref.. they're both removed in
856 * unregister when this ref is dropped */
857 kref_init(&nmh->nh_kref);
858 INIT_LIST_HEAD(&nmh->nh_unregister_item);
859
860 write_lock(&o2net_handler_lock);
861 if (o2net_handler_tree_lookup(msg_type, key, &p, &parent))
862 ret = -EEXIST;
863 else {
864 rb_link_node(&nmh->nh_node, parent, p);
865 rb_insert_color(&nmh->nh_node, &o2net_handler_tree);
866 list_add_tail(&nmh->nh_unregister_item, unreg_list);
867
868 mlog(ML_TCP, "registered handler func %p type %u key %08x\n",
869 func, msg_type, key);
870 /* we've had some trouble with handlers seemingly vanishing. */
871 mlog_bug_on_msg(o2net_handler_tree_lookup(msg_type, key, &p,
872 &parent) == NULL,
873 "couldn't find handler we *just* registerd "
874 "for type %u key %08x\n", msg_type, key);
875 }
876 write_unlock(&o2net_handler_lock);
877 if (ret)
878 goto out;
879
880out:
881 if (ret)
882 kfree(nmh);
883
884 return ret;
885}
886EXPORT_SYMBOL_GPL(o2net_register_handler);
887
888void o2net_unregister_handler_list(struct list_head *list)
889{
890 struct o2net_msg_handler *nmh, *n;
891
892 write_lock(&o2net_handler_lock);
893 list_for_each_entry_safe(nmh, n, list, nh_unregister_item) {
894 mlog(ML_TCP, "unregistering handler func %p type %u key %08x\n",
895 nmh->nh_func, nmh->nh_msg_type, nmh->nh_key);
896 rb_erase(&nmh->nh_node, &o2net_handler_tree);
897 list_del_init(&nmh->nh_unregister_item);
898 kref_put(&nmh->nh_kref, o2net_handler_kref_release);
899 }
900 write_unlock(&o2net_handler_lock);
901}
902EXPORT_SYMBOL_GPL(o2net_unregister_handler_list);
903
904static struct o2net_msg_handler *o2net_handler_get(u32 msg_type, u32 key)
905{
906 struct o2net_msg_handler *nmh;
907
908 read_lock(&o2net_handler_lock);
909 nmh = o2net_handler_tree_lookup(msg_type, key, NULL, NULL);
910 if (nmh)
911 kref_get(&nmh->nh_kref);
912 read_unlock(&o2net_handler_lock);
913
914 return nmh;
915}
916
917/* ------------------------------------------------------------ */
918
919static int o2net_recv_tcp_msg(struct socket *sock, void *data, size_t len)
920{
921 int ret;
922 mm_segment_t oldfs;
923 struct kvec vec = {
924 .iov_len = len,
925 .iov_base = data,
926 };
927 struct msghdr msg = {
928 .msg_iovlen = 1,
929 .msg_iov = (struct iovec *)&vec,
930 .msg_flags = MSG_DONTWAIT,
931 };
932
933 oldfs = get_fs();
934 set_fs(get_ds());
935 ret = sock_recvmsg(sock, &msg, len, msg.msg_flags);
936 set_fs(oldfs);
937
938 return ret;
939}
940
941static int o2net_send_tcp_msg(struct socket *sock, struct kvec *vec,
942 size_t veclen, size_t total)
943{
944 int ret;
945 mm_segment_t oldfs;
946 struct msghdr msg = {
947 .msg_iov = (struct iovec *)vec,
948 .msg_iovlen = veclen,
949 };
950
951 if (sock == NULL) {
952 ret = -EINVAL;
953 goto out;
954 }
955
956 oldfs = get_fs();
957 set_fs(get_ds());
958 ret = sock_sendmsg(sock, &msg, total);
959 set_fs(oldfs);
960 if (ret != total) {
961 mlog(ML_ERROR, "sendmsg returned %d instead of %zu\n", ret,
962 total);
963 if (ret >= 0)
964 ret = -EPIPE; /* should be smarter, I bet */
965 goto out;
966 }
967
968 ret = 0;
969out:
970 if (ret < 0)
971 mlog(0, "returning error: %d\n", ret);
972 return ret;
973}
974
975static void o2net_sendpage(struct o2net_sock_container *sc,
976 void *kmalloced_virt,
977 size_t size)
978{
979 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
980 ssize_t ret;
981
982 while (1) {
983 mutex_lock(&sc->sc_send_lock);
984 ret = sc->sc_sock->ops->sendpage(sc->sc_sock,
985 virt_to_page(kmalloced_virt),
986 (long)kmalloced_virt & ~PAGE_MASK,
987 size, MSG_DONTWAIT);
988 mutex_unlock(&sc->sc_send_lock);
989 if (ret == size)
990 break;
991 if (ret == (ssize_t)-EAGAIN) {
992 mlog(0, "sendpage of size %zu to " SC_NODEF_FMT
993 " returned EAGAIN\n", size, SC_NODEF_ARGS(sc));
994 cond_resched();
995 continue;
996 }
997 mlog(ML_ERROR, "sendpage of size %zu to " SC_NODEF_FMT
998 " failed with %zd\n", size, SC_NODEF_ARGS(sc), ret);
999 o2net_ensure_shutdown(nn, sc, 0);
1000 break;
1001 }
1002}
1003
1004static void o2net_init_msg(struct o2net_msg *msg, u16 data_len, u16 msg_type, u32 key)
1005{
1006 memset(msg, 0, sizeof(struct o2net_msg));
1007 msg->magic = cpu_to_be16(O2NET_MSG_MAGIC);
1008 msg->data_len = cpu_to_be16(data_len);
1009 msg->msg_type = cpu_to_be16(msg_type);
1010 msg->sys_status = cpu_to_be32(O2NET_ERR_NONE);
1011 msg->status = 0;
1012 msg->key = cpu_to_be32(key);
1013}
1014
1015static int o2net_tx_can_proceed(struct o2net_node *nn,
1016 struct o2net_sock_container **sc_ret,
1017 int *error)
1018{
1019 int ret = 0;
1020
1021 spin_lock(&nn->nn_lock);
1022 if (nn->nn_persistent_error) {
1023 ret = 1;
1024 *sc_ret = NULL;
1025 *error = nn->nn_persistent_error;
1026 } else if (nn->nn_sc_valid) {
1027 kref_get(&nn->nn_sc->sc_kref);
1028
1029 ret = 1;
1030 *sc_ret = nn->nn_sc;
1031 *error = 0;
1032 }
1033 spin_unlock(&nn->nn_lock);
1034
1035 return ret;
1036}
1037
1038/* Get a map of all nodes to which this node is currently connected to */
1039void o2net_fill_node_map(unsigned long *map, unsigned bytes)
1040{
1041 struct o2net_sock_container *sc;
1042 int node, ret;
1043
1044 BUG_ON(bytes < (BITS_TO_LONGS(O2NM_MAX_NODES) * sizeof(unsigned long)));
1045
1046 memset(map, 0, bytes);
1047 for (node = 0; node < O2NM_MAX_NODES; ++node) {
1048 o2net_tx_can_proceed(o2net_nn_from_num(node), &sc, &ret);
1049 if (!ret) {
1050 set_bit(node, map);
1051 sc_put(sc);
1052 }
1053 }
1054}
1055EXPORT_SYMBOL_GPL(o2net_fill_node_map);
1056
1057int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *caller_vec,
1058 size_t caller_veclen, u8 target_node, int *status)
1059{
1060 int ret = 0;
1061 struct o2net_msg *msg = NULL;
1062 size_t veclen, caller_bytes = 0;
1063 struct kvec *vec = NULL;
1064 struct o2net_sock_container *sc = NULL;
1065 struct o2net_node *nn = o2net_nn_from_num(target_node);
1066 struct o2net_status_wait nsw = {
1067 .ns_node_item = LIST_HEAD_INIT(nsw.ns_node_item),
1068 };
1069 struct o2net_send_tracking nst;
1070
1071 o2net_init_nst(&nst, msg_type, key, current, target_node);
1072
1073 if (o2net_wq == NULL) {
1074 mlog(0, "attempt to tx without o2netd running\n");
1075 ret = -ESRCH;
1076 goto out;
1077 }
1078
1079 if (caller_veclen == 0) {
1080 mlog(0, "bad kvec array length\n");
1081 ret = -EINVAL;
1082 goto out;
1083 }
1084
1085 caller_bytes = iov_length((struct iovec *)caller_vec, caller_veclen);
1086 if (caller_bytes > O2NET_MAX_PAYLOAD_BYTES) {
1087 mlog(0, "total payload len %zu too large\n", caller_bytes);
1088 ret = -EINVAL;
1089 goto out;
1090 }
1091
1092 if (target_node == o2nm_this_node()) {
1093 ret = -ELOOP;
1094 goto out;
1095 }
1096
1097 o2net_debug_add_nst(&nst);
1098
1099 o2net_set_nst_sock_time(&nst);
1100
1101 wait_event(nn->nn_sc_wq, o2net_tx_can_proceed(nn, &sc, &ret));
1102 if (ret)
1103 goto out;
1104
1105 o2net_set_nst_sock_container(&nst, sc);
1106
1107 veclen = caller_veclen + 1;
1108 vec = kmalloc(sizeof(struct kvec) * veclen, GFP_ATOMIC);
1109 if (vec == NULL) {
1110 mlog(0, "failed to %zu element kvec!\n", veclen);
1111 ret = -ENOMEM;
1112 goto out;
1113 }
1114
1115 msg = kmalloc(sizeof(struct o2net_msg), GFP_ATOMIC);
1116 if (!msg) {
1117 mlog(0, "failed to allocate a o2net_msg!\n");
1118 ret = -ENOMEM;
1119 goto out;
1120 }
1121
1122 o2net_init_msg(msg, caller_bytes, msg_type, key);
1123
1124 vec[0].iov_len = sizeof(struct o2net_msg);
1125 vec[0].iov_base = msg;
1126 memcpy(&vec[1], caller_vec, caller_veclen * sizeof(struct kvec));
1127
1128 ret = o2net_prep_nsw(nn, &nsw);
1129 if (ret)
1130 goto out;
1131
1132 msg->msg_num = cpu_to_be32(nsw.ns_id);
1133 o2net_set_nst_msg_id(&nst, nsw.ns_id);
1134
1135 o2net_set_nst_send_time(&nst);
1136
1137 /* finally, convert the message header to network byte-order
1138 * and send */
1139 mutex_lock(&sc->sc_send_lock);
1140 ret = o2net_send_tcp_msg(sc->sc_sock, vec, veclen,
1141 sizeof(struct o2net_msg) + caller_bytes);
1142 mutex_unlock(&sc->sc_send_lock);
1143 msglog(msg, "sending returned %d\n", ret);
1144 if (ret < 0) {
1145 mlog(0, "error returned from o2net_send_tcp_msg=%d\n", ret);
1146 goto out;
1147 }
1148
1149 /* wait on other node's handler */
1150 o2net_set_nst_status_time(&nst);
1151 wait_event(nsw.ns_wq, o2net_nsw_completed(nn, &nsw));
1152
1153 o2net_update_send_stats(&nst, sc);
1154
1155 /* Note that we avoid overwriting the callers status return
1156 * variable if a system error was reported on the other
1157 * side. Callers beware. */
1158 ret = o2net_sys_err_to_errno(nsw.ns_sys_status);
1159 if (status && !ret)
1160 *status = nsw.ns_status;
1161
1162 mlog(0, "woken, returning system status %d, user status %d\n",
1163 ret, nsw.ns_status);
1164out:
1165 o2net_debug_del_nst(&nst); /* must be before dropping sc and node */
1166 if (sc)
1167 sc_put(sc);
1168 if (vec)
1169 kfree(vec);
1170 if (msg)
1171 kfree(msg);
1172 o2net_complete_nsw(nn, &nsw, 0, 0, 0);
1173 return ret;
1174}
1175EXPORT_SYMBOL_GPL(o2net_send_message_vec);
1176
1177int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
1178 u8 target_node, int *status)
1179{
1180 struct kvec vec = {
1181 .iov_base = data,
1182 .iov_len = len,
1183 };
1184 return o2net_send_message_vec(msg_type, key, &vec, 1,
1185 target_node, status);
1186}
1187EXPORT_SYMBOL_GPL(o2net_send_message);
1188
1189static int o2net_send_status_magic(struct socket *sock, struct o2net_msg *hdr,
1190 enum o2net_system_error syserr, int err)
1191{
1192 struct kvec vec = {
1193 .iov_base = hdr,
1194 .iov_len = sizeof(struct o2net_msg),
1195 };
1196
1197 BUG_ON(syserr >= O2NET_ERR_MAX);
1198
1199 /* leave other fields intact from the incoming message, msg_num
1200 * in particular */
1201 hdr->sys_status = cpu_to_be32(syserr);
1202 hdr->status = cpu_to_be32(err);
1203 hdr->magic = cpu_to_be16(O2NET_MSG_STATUS_MAGIC); // twiddle the magic
1204 hdr->data_len = 0;
1205
1206 msglog(hdr, "about to send status magic %d\n", err);
1207 /* hdr has been in host byteorder this whole time */
1208 return o2net_send_tcp_msg(sock, &vec, 1, sizeof(struct o2net_msg));
1209}
1210
1211/* this returns -errno if the header was unknown or too large, etc.
1212 * after this is called the buffer us reused for the next message */
1213static int o2net_process_message(struct o2net_sock_container *sc,
1214 struct o2net_msg *hdr)
1215{
1216 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1217 int ret = 0, handler_status;
1218 enum o2net_system_error syserr;
1219 struct o2net_msg_handler *nmh = NULL;
1220 void *ret_data = NULL;
1221
1222 msglog(hdr, "processing message\n");
1223
1224 o2net_sc_postpone_idle(sc);
1225
1226 switch(be16_to_cpu(hdr->magic)) {
1227 case O2NET_MSG_STATUS_MAGIC:
1228 /* special type for returning message status */
1229 o2net_complete_nsw(nn, NULL,
1230 be32_to_cpu(hdr->msg_num),
1231 be32_to_cpu(hdr->sys_status),
1232 be32_to_cpu(hdr->status));
1233 goto out;
1234 case O2NET_MSG_KEEP_REQ_MAGIC:
1235 o2net_sendpage(sc, o2net_keep_resp,
1236 sizeof(*o2net_keep_resp));
1237 goto out;
1238 case O2NET_MSG_KEEP_RESP_MAGIC:
1239 goto out;
1240 case O2NET_MSG_MAGIC:
1241 break;
1242 default:
1243 msglog(hdr, "bad magic\n");
1244 ret = -EINVAL;
1245 goto out;
1246 break;
1247 }
1248
1249 /* find a handler for it */
1250 handler_status = 0;
1251 nmh = o2net_handler_get(be16_to_cpu(hdr->msg_type),
1252 be32_to_cpu(hdr->key));
1253 if (!nmh) {
1254 mlog(ML_TCP, "couldn't find handler for type %u key %08x\n",
1255 be16_to_cpu(hdr->msg_type), be32_to_cpu(hdr->key));
1256 syserr = O2NET_ERR_NO_HNDLR;
1257 goto out_respond;
1258 }
1259
1260 syserr = O2NET_ERR_NONE;
1261
1262 if (be16_to_cpu(hdr->data_len) > nmh->nh_max_len)
1263 syserr = O2NET_ERR_OVERFLOW;
1264
1265 if (syserr != O2NET_ERR_NONE)
1266 goto out_respond;
1267
1268 o2net_set_func_start_time(sc);
1269 sc->sc_msg_key = be32_to_cpu(hdr->key);
1270 sc->sc_msg_type = be16_to_cpu(hdr->msg_type);
1271 handler_status = (nmh->nh_func)(hdr, sizeof(struct o2net_msg) +
1272 be16_to_cpu(hdr->data_len),
1273 nmh->nh_func_data, &ret_data);
1274 o2net_set_func_stop_time(sc);
1275
1276 o2net_update_recv_stats(sc);
1277
1278out_respond:
1279 /* this destroys the hdr, so don't use it after this */
1280 mutex_lock(&sc->sc_send_lock);
1281 ret = o2net_send_status_magic(sc->sc_sock, hdr, syserr,
1282 handler_status);
1283 mutex_unlock(&sc->sc_send_lock);
1284 hdr = NULL;
1285 mlog(0, "sending handler status %d, syserr %d returned %d\n",
1286 handler_status, syserr, ret);
1287
1288 if (nmh) {
1289 BUG_ON(ret_data != NULL && nmh->nh_post_func == NULL);
1290 if (nmh->nh_post_func)
1291 (nmh->nh_post_func)(handler_status, nmh->nh_func_data,
1292 ret_data);
1293 }
1294
1295out:
1296 if (nmh)
1297 o2net_handler_put(nmh);
1298 return ret;
1299}
1300
1301static int o2net_check_handshake(struct o2net_sock_container *sc)
1302{
1303 struct o2net_handshake *hand = page_address(sc->sc_page);
1304 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1305
1306 if (hand->protocol_version != cpu_to_be64(O2NET_PROTOCOL_VERSION)) {
1307 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " Advertised net "
1308 "protocol version %llu but %llu is required. "
1309 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1310 (unsigned long long)be64_to_cpu(hand->protocol_version),
1311 O2NET_PROTOCOL_VERSION);
1312
1313 /* don't bother reconnecting if its the wrong version. */
1314 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1315 return -1;
1316 }
1317
1318 /*
1319 * Ensure timeouts are consistent with other nodes, otherwise
1320 * we can end up with one node thinking that the other must be down,
1321 * but isn't. This can ultimately cause corruption.
1322 */
1323 if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
1324 o2net_idle_timeout()) {
1325 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a network "
1326 "idle timeout of %u ms, but we use %u ms locally. "
1327 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1328 be32_to_cpu(hand->o2net_idle_timeout_ms),
1329 o2net_idle_timeout());
1330 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1331 return -1;
1332 }
1333
1334 if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
1335 o2net_keepalive_delay()) {
1336 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a keepalive "
1337 "delay of %u ms, but we use %u ms locally. "
1338 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1339 be32_to_cpu(hand->o2net_keepalive_delay_ms),
1340 o2net_keepalive_delay());
1341 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1342 return -1;
1343 }
1344
1345 if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
1346 O2HB_MAX_WRITE_TIMEOUT_MS) {
1347 printk(KERN_NOTICE "o2net: " SC_NODEF_FMT " uses a heartbeat "
1348 "timeout of %u ms, but we use %u ms locally. "
1349 "Disconnecting.\n", SC_NODEF_ARGS(sc),
1350 be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
1351 O2HB_MAX_WRITE_TIMEOUT_MS);
1352 o2net_ensure_shutdown(nn, sc, -ENOTCONN);
1353 return -1;
1354 }
1355
1356 sc->sc_handshake_ok = 1;
1357
1358 spin_lock(&nn->nn_lock);
1359 /* set valid and queue the idle timers only if it hasn't been
1360 * shut down already */
1361 if (nn->nn_sc == sc) {
1362 o2net_sc_reset_idle_timer(sc);
1363 atomic_set(&nn->nn_timeout, 0);
1364 o2net_set_nn_state(nn, sc, 1, 0);
1365 }
1366 spin_unlock(&nn->nn_lock);
1367
1368 /* shift everything up as though it wasn't there */
1369 sc->sc_page_off -= sizeof(struct o2net_handshake);
1370 if (sc->sc_page_off)
1371 memmove(hand, hand + 1, sc->sc_page_off);
1372
1373 return 0;
1374}
1375
1376/* this demuxes the queued rx bytes into header or payload bits and calls
1377 * handlers as each full message is read off the socket. it returns -error,
1378 * == 0 eof, or > 0 for progress made.*/
1379static int o2net_advance_rx(struct o2net_sock_container *sc)
1380{
1381 struct o2net_msg *hdr;
1382 int ret = 0;
1383 void *data;
1384 size_t datalen;
1385
1386 sclog(sc, "receiving\n");
1387 o2net_set_advance_start_time(sc);
1388
1389 if (unlikely(sc->sc_handshake_ok == 0)) {
1390 if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
1391 data = page_address(sc->sc_page) + sc->sc_page_off;
1392 datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
1393 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1394 if (ret > 0)
1395 sc->sc_page_off += ret;
1396 }
1397
1398 if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
1399 o2net_check_handshake(sc);
1400 if (unlikely(sc->sc_handshake_ok == 0))
1401 ret = -EPROTO;
1402 }
1403 goto out;
1404 }
1405
1406 /* do we need more header? */
1407 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1408 data = page_address(sc->sc_page) + sc->sc_page_off;
1409 datalen = sizeof(struct o2net_msg) - sc->sc_page_off;
1410 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1411 if (ret > 0) {
1412 sc->sc_page_off += ret;
1413 /* only swab incoming here.. we can
1414 * only get here once as we cross from
1415 * being under to over */
1416 if (sc->sc_page_off == sizeof(struct o2net_msg)) {
1417 hdr = page_address(sc->sc_page);
1418 if (be16_to_cpu(hdr->data_len) >
1419 O2NET_MAX_PAYLOAD_BYTES)
1420 ret = -EOVERFLOW;
1421 }
1422 }
1423 if (ret <= 0)
1424 goto out;
1425 }
1426
1427 if (sc->sc_page_off < sizeof(struct o2net_msg)) {
1428 /* oof, still don't have a header */
1429 goto out;
1430 }
1431
1432 /* this was swabbed above when we first read it */
1433 hdr = page_address(sc->sc_page);
1434
1435 msglog(hdr, "at page_off %zu\n", sc->sc_page_off);
1436
1437 /* do we need more payload? */
1438 if (sc->sc_page_off - sizeof(struct o2net_msg) < be16_to_cpu(hdr->data_len)) {
1439 /* need more payload */
1440 data = page_address(sc->sc_page) + sc->sc_page_off;
1441 datalen = (sizeof(struct o2net_msg) + be16_to_cpu(hdr->data_len)) -
1442 sc->sc_page_off;
1443 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
1444 if (ret > 0)
1445 sc->sc_page_off += ret;
1446 if (ret <= 0)
1447 goto out;
1448 }
1449
1450 if (sc->sc_page_off - sizeof(struct o2net_msg) == be16_to_cpu(hdr->data_len)) {
1451 /* we can only get here once, the first time we read
1452 * the payload.. so set ret to progress if the handler
1453 * works out. after calling this the message is toast */
1454 ret = o2net_process_message(sc, hdr);
1455 if (ret == 0)
1456 ret = 1;
1457 sc->sc_page_off = 0;
1458 }
1459
1460out:
1461 sclog(sc, "ret = %d\n", ret);
1462 o2net_set_advance_stop_time(sc);
1463 return ret;
1464}
1465
1466/* this work func is triggerd by data ready. it reads until it can read no
1467 * more. it interprets 0, eof, as fatal. if data_ready hits while we're doing
1468 * our work the work struct will be marked and we'll be called again. */
1469static void o2net_rx_until_empty(struct work_struct *work)
1470{
1471 struct o2net_sock_container *sc =
1472 container_of(work, struct o2net_sock_container, sc_rx_work);
1473 int ret;
1474
1475 do {
1476 ret = o2net_advance_rx(sc);
1477 } while (ret > 0);
1478
1479 if (ret <= 0 && ret != -EAGAIN) {
1480 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1481 sclog(sc, "saw error %d, closing\n", ret);
1482 /* not permanent so read failed handshake can retry */
1483 o2net_ensure_shutdown(nn, sc, 0);
1484 }
1485
1486 sc_put(sc);
1487}
1488
1489static int o2net_set_nodelay(struct socket *sock)
1490{
1491 int ret, val = 1;
1492 mm_segment_t oldfs;
1493
1494 oldfs = get_fs();
1495 set_fs(KERNEL_DS);
1496
1497 /*
1498 * Dear unsuspecting programmer,
1499 *
1500 * Don't use sock_setsockopt() for SOL_TCP. It doesn't check its level
1501 * argument and assumes SOL_SOCKET so, say, your TCP_NODELAY will
1502 * silently turn into SO_DEBUG.
1503 *
1504 * Yours,
1505 * Keeper of hilariously fragile interfaces.
1506 */
1507 ret = sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY,
1508 (char __user *)&val, sizeof(val));
1509
1510 set_fs(oldfs);
1511 return ret;
1512}
1513
1514static void o2net_initialize_handshake(void)
1515{
1516 o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
1517 O2HB_MAX_WRITE_TIMEOUT_MS);
1518 o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(o2net_idle_timeout());
1519 o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
1520 o2net_keepalive_delay());
1521 o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
1522 o2net_reconnect_delay());
1523}
1524
1525/* ------------------------------------------------------------ */
1526
1527/* called when a connect completes and after a sock is accepted. the
1528 * rx path will see the response and mark the sc valid */
1529static void o2net_sc_connect_completed(struct work_struct *work)
1530{
1531 struct o2net_sock_container *sc =
1532 container_of(work, struct o2net_sock_container,
1533 sc_connect_work);
1534
1535 mlog(ML_MSG, "sc sending handshake with ver %llu id %llx\n",
1536 (unsigned long long)O2NET_PROTOCOL_VERSION,
1537 (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
1538
1539 o2net_initialize_handshake();
1540 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1541 sc_put(sc);
1542}
1543
1544/* this is called as a work_struct func. */
1545static void o2net_sc_send_keep_req(struct work_struct *work)
1546{
1547 struct o2net_sock_container *sc =
1548 container_of(work, struct o2net_sock_container,
1549 sc_keepalive_work.work);
1550
1551 o2net_sendpage(sc, o2net_keep_req, sizeof(*o2net_keep_req));
1552 sc_put(sc);
1553}
1554
1555/* socket shutdown does a del_timer_sync against this as it tears down.
1556 * we can't start this timer until we've got to the point in sc buildup
1557 * where shutdown is going to be involved */
1558static void o2net_idle_timer(unsigned long data)
1559{
1560 struct o2net_sock_container *sc = (struct o2net_sock_container *)data;
1561 struct o2net_node *nn = o2net_nn_from_num(sc->sc_node->nd_num);
1562#ifdef CONFIG_DEBUG_FS
1563 unsigned long msecs = ktime_to_ms(ktime_get()) -
1564 ktime_to_ms(sc->sc_tv_timer);
1565#else
1566 unsigned long msecs = o2net_idle_timeout();
1567#endif
1568
1569 printk(KERN_NOTICE "o2net: Connection to " SC_NODEF_FMT " has been "
1570 "idle for %lu.%lu secs, shutting it down.\n", SC_NODEF_ARGS(sc),
1571 msecs / 1000, msecs % 1000);
1572
1573 /*
1574 * Initialize the nn_timeout so that the next connection attempt
1575 * will continue in o2net_start_connect.
1576 */
1577 atomic_set(&nn->nn_timeout, 1);
1578
1579 o2net_sc_queue_work(sc, &sc->sc_shutdown_work);
1580}
1581
1582static void o2net_sc_reset_idle_timer(struct o2net_sock_container *sc)
1583{
1584 o2net_sc_cancel_delayed_work(sc, &sc->sc_keepalive_work);
1585 o2net_sc_queue_delayed_work(sc, &sc->sc_keepalive_work,
1586 msecs_to_jiffies(o2net_keepalive_delay()));
1587 o2net_set_sock_timer(sc);
1588 mod_timer(&sc->sc_idle_timeout,
1589 jiffies + msecs_to_jiffies(o2net_idle_timeout()));
1590}
1591
1592static void o2net_sc_postpone_idle(struct o2net_sock_container *sc)
1593{
1594 /* Only push out an existing timer */
1595 if (timer_pending(&sc->sc_idle_timeout))
1596 o2net_sc_reset_idle_timer(sc);
1597}
1598
1599/* this work func is kicked whenever a path sets the nn state which doesn't
1600 * have valid set. This includes seeing hb come up, losing a connection,
1601 * having a connect attempt fail, etc. This centralizes the logic which decides
1602 * if a connect attempt should be made or if we should give up and all future
1603 * transmit attempts should fail */
1604static void o2net_start_connect(struct work_struct *work)
1605{
1606 struct o2net_node *nn =
1607 container_of(work, struct o2net_node, nn_connect_work.work);
1608 struct o2net_sock_container *sc = NULL;
1609 struct o2nm_node *node = NULL, *mynode = NULL;
1610 struct socket *sock = NULL;
1611 struct sockaddr_in myaddr = {0, }, remoteaddr = {0, };
1612 int ret = 0, stop;
1613 unsigned int timeout;
1614
1615 /* if we're greater we initiate tx, otherwise we accept */
1616 if (o2nm_this_node() <= o2net_num_from_nn(nn))
1617 goto out;
1618
1619 /* watch for racing with tearing a node down */
1620 node = o2nm_get_node_by_num(o2net_num_from_nn(nn));
1621 if (node == NULL) {
1622 ret = 0;
1623 goto out;
1624 }
1625
1626 mynode = o2nm_get_node_by_num(o2nm_this_node());
1627 if (mynode == NULL) {
1628 ret = 0;
1629 goto out;
1630 }
1631
1632 spin_lock(&nn->nn_lock);
1633 /*
1634 * see if we already have one pending or have given up.
1635 * For nn_timeout, it is set when we close the connection
1636 * because of the idle time out. So it means that we have
1637 * at least connected to that node successfully once,
1638 * now try to connect to it again.
1639 */
1640 timeout = atomic_read(&nn->nn_timeout);
1641 stop = (nn->nn_sc ||
1642 (nn->nn_persistent_error &&
1643 (nn->nn_persistent_error != -ENOTCONN || timeout == 0)));
1644 spin_unlock(&nn->nn_lock);
1645 if (stop)
1646 goto out;
1647
1648 nn->nn_last_connect_attempt = jiffies;
1649
1650 sc = sc_alloc(node);
1651 if (sc == NULL) {
1652 mlog(0, "couldn't allocate sc\n");
1653 ret = -ENOMEM;
1654 goto out;
1655 }
1656
1657 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1658 if (ret < 0) {
1659 mlog(0, "can't create socket: %d\n", ret);
1660 goto out;
1661 }
1662 sc->sc_sock = sock; /* freed by sc_kref_release */
1663
1664 sock->sk->sk_allocation = GFP_ATOMIC;
1665
1666 myaddr.sin_family = AF_INET;
1667 myaddr.sin_addr.s_addr = mynode->nd_ipv4_address;
1668 myaddr.sin_port = htons(0); /* any port */
1669
1670 ret = sock->ops->bind(sock, (struct sockaddr *)&myaddr,
1671 sizeof(myaddr));
1672 if (ret) {
1673 mlog(ML_ERROR, "bind failed with %d at address %pI4\n",
1674 ret, &mynode->nd_ipv4_address);
1675 goto out;
1676 }
1677
1678 ret = o2net_set_nodelay(sc->sc_sock);
1679 if (ret) {
1680 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1681 goto out;
1682 }
1683
1684 o2net_register_callbacks(sc->sc_sock->sk, sc);
1685
1686 spin_lock(&nn->nn_lock);
1687 /* handshake completion will set nn->nn_sc_valid */
1688 o2net_set_nn_state(nn, sc, 0, 0);
1689 spin_unlock(&nn->nn_lock);
1690
1691 remoteaddr.sin_family = AF_INET;
1692 remoteaddr.sin_addr.s_addr = node->nd_ipv4_address;
1693 remoteaddr.sin_port = node->nd_ipv4_port;
1694
1695 ret = sc->sc_sock->ops->connect(sc->sc_sock,
1696 (struct sockaddr *)&remoteaddr,
1697 sizeof(remoteaddr),
1698 O_NONBLOCK);
1699 if (ret == -EINPROGRESS)
1700 ret = 0;
1701
1702out:
1703 if (ret) {
1704 printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
1705 " failed with errno %d\n", SC_NODEF_ARGS(sc), ret);
1706 /* 0 err so that another will be queued and attempted
1707 * from set_nn_state */
1708 if (sc)
1709 o2net_ensure_shutdown(nn, sc, 0);
1710 }
1711 if (sc)
1712 sc_put(sc);
1713 if (node)
1714 o2nm_node_put(node);
1715 if (mynode)
1716 o2nm_node_put(mynode);
1717
1718 return;
1719}
1720
1721static void o2net_connect_expired(struct work_struct *work)
1722{
1723 struct o2net_node *nn =
1724 container_of(work, struct o2net_node, nn_connect_expired.work);
1725
1726 spin_lock(&nn->nn_lock);
1727 if (!nn->nn_sc_valid) {
1728 printk(KERN_NOTICE "o2net: No connection established with "
1729 "node %u after %u.%u seconds, giving up.\n",
1730 o2net_num_from_nn(nn),
1731 o2net_idle_timeout() / 1000,
1732 o2net_idle_timeout() % 1000);
1733
1734 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1735 }
1736 spin_unlock(&nn->nn_lock);
1737}
1738
1739static void o2net_still_up(struct work_struct *work)
1740{
1741 struct o2net_node *nn =
1742 container_of(work, struct o2net_node, nn_still_up.work);
1743
1744 o2quo_hb_still_up(o2net_num_from_nn(nn));
1745}
1746
1747/* ------------------------------------------------------------ */
1748
1749void o2net_disconnect_node(struct o2nm_node *node)
1750{
1751 struct o2net_node *nn = o2net_nn_from_num(node->nd_num);
1752
1753 /* don't reconnect until it's heartbeating again */
1754 spin_lock(&nn->nn_lock);
1755 atomic_set(&nn->nn_timeout, 0);
1756 o2net_set_nn_state(nn, NULL, 0, -ENOTCONN);
1757 spin_unlock(&nn->nn_lock);
1758
1759 if (o2net_wq) {
1760 cancel_delayed_work(&nn->nn_connect_expired);
1761 cancel_delayed_work(&nn->nn_connect_work);
1762 cancel_delayed_work(&nn->nn_still_up);
1763 flush_workqueue(o2net_wq);
1764 }
1765}
1766
1767static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
1768 void *data)
1769{
1770 o2quo_hb_down(node_num);
1771
1772 if (!node)
1773 return;
1774
1775 if (node_num != o2nm_this_node())
1776 o2net_disconnect_node(node);
1777
1778 BUG_ON(atomic_read(&o2net_connected_peers) < 0);
1779}
1780
1781static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
1782 void *data)
1783{
1784 struct o2net_node *nn = o2net_nn_from_num(node_num);
1785
1786 o2quo_hb_up(node_num);
1787
1788 BUG_ON(!node);
1789
1790 /* ensure an immediate connect attempt */
1791 nn->nn_last_connect_attempt = jiffies -
1792 (msecs_to_jiffies(o2net_reconnect_delay()) + 1);
1793
1794 if (node_num != o2nm_this_node()) {
1795 /* believe it or not, accept and node hearbeating testing
1796 * can succeed for this node before we got here.. so
1797 * only use set_nn_state to clear the persistent error
1798 * if that hasn't already happened */
1799 spin_lock(&nn->nn_lock);
1800 atomic_set(&nn->nn_timeout, 0);
1801 if (nn->nn_persistent_error)
1802 o2net_set_nn_state(nn, NULL, 0, 0);
1803 spin_unlock(&nn->nn_lock);
1804 }
1805}
1806
1807void o2net_unregister_hb_callbacks(void)
1808{
1809 o2hb_unregister_callback(NULL, &o2net_hb_up);
1810 o2hb_unregister_callback(NULL, &o2net_hb_down);
1811}
1812
1813int o2net_register_hb_callbacks(void)
1814{
1815 int ret;
1816
1817 o2hb_setup_callback(&o2net_hb_down, O2HB_NODE_DOWN_CB,
1818 o2net_hb_node_down_cb, NULL, O2NET_HB_PRI);
1819 o2hb_setup_callback(&o2net_hb_up, O2HB_NODE_UP_CB,
1820 o2net_hb_node_up_cb, NULL, O2NET_HB_PRI);
1821
1822 ret = o2hb_register_callback(NULL, &o2net_hb_up);
1823 if (ret == 0)
1824 ret = o2hb_register_callback(NULL, &o2net_hb_down);
1825
1826 if (ret)
1827 o2net_unregister_hb_callbacks();
1828
1829 return ret;
1830}
1831
1832/* ------------------------------------------------------------ */
1833
1834static int o2net_accept_one(struct socket *sock)
1835{
1836 int ret, slen;
1837 struct sockaddr_in sin;
1838 struct socket *new_sock = NULL;
1839 struct o2nm_node *node = NULL;
1840 struct o2nm_node *local_node = NULL;
1841 struct o2net_sock_container *sc = NULL;
1842 struct o2net_node *nn;
1843
1844 BUG_ON(sock == NULL);
1845 ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type,
1846 sock->sk->sk_protocol, &new_sock);
1847 if (ret)
1848 goto out;
1849
1850 new_sock->type = sock->type;
1851 new_sock->ops = sock->ops;
1852 ret = sock->ops->accept(sock, new_sock, O_NONBLOCK);
1853 if (ret < 0)
1854 goto out;
1855
1856 new_sock->sk->sk_allocation = GFP_ATOMIC;
1857
1858 ret = o2net_set_nodelay(new_sock);
1859 if (ret) {
1860 mlog(ML_ERROR, "setting TCP_NODELAY failed with %d\n", ret);
1861 goto out;
1862 }
1863
1864 slen = sizeof(sin);
1865 ret = new_sock->ops->getname(new_sock, (struct sockaddr *) &sin,
1866 &slen, 1);
1867 if (ret < 0)
1868 goto out;
1869
1870 node = o2nm_get_node_by_ip(sin.sin_addr.s_addr);
1871 if (node == NULL) {
1872 printk(KERN_NOTICE "o2net: Attempt to connect from unknown "
1873 "node at %pI4:%d\n", &sin.sin_addr.s_addr,
1874 ntohs(sin.sin_port));
1875 ret = -EINVAL;
1876 goto out;
1877 }
1878
1879 if (o2nm_this_node() >= node->nd_num) {
1880 local_node = o2nm_get_node_by_num(o2nm_this_node());
1881 printk(KERN_NOTICE "o2net: Unexpected connect attempt seen "
1882 "at node '%s' (%u, %pI4:%d) from node '%s' (%u, "
1883 "%pI4:%d)\n", local_node->nd_name, local_node->nd_num,
1884 &(local_node->nd_ipv4_address),
1885 ntohs(local_node->nd_ipv4_port), node->nd_name,
1886 node->nd_num, &sin.sin_addr.s_addr, ntohs(sin.sin_port));
1887 ret = -EINVAL;
1888 goto out;
1889 }
1890
1891 /* this happens all the time when the other node sees our heartbeat
1892 * and tries to connect before we see their heartbeat */
1893 if (!o2hb_check_node_heartbeating_from_callback(node->nd_num)) {
1894 mlog(ML_CONN, "attempt to connect from node '%s' at "
1895 "%pI4:%d but it isn't heartbeating\n",
1896 node->nd_name, &sin.sin_addr.s_addr,
1897 ntohs(sin.sin_port));
1898 ret = -EINVAL;
1899 goto out;
1900 }
1901
1902 nn = o2net_nn_from_num(node->nd_num);
1903
1904 spin_lock(&nn->nn_lock);
1905 if (nn->nn_sc)
1906 ret = -EBUSY;
1907 else
1908 ret = 0;
1909 spin_unlock(&nn->nn_lock);
1910 if (ret) {
1911 printk(KERN_NOTICE "o2net: Attempt to connect from node '%s' "
1912 "at %pI4:%d but it already has an open connection\n",
1913 node->nd_name, &sin.sin_addr.s_addr,
1914 ntohs(sin.sin_port));
1915 goto out;
1916 }
1917
1918 sc = sc_alloc(node);
1919 if (sc == NULL) {
1920 ret = -ENOMEM;
1921 goto out;
1922 }
1923
1924 sc->sc_sock = new_sock;
1925 new_sock = NULL;
1926
1927 spin_lock(&nn->nn_lock);
1928 atomic_set(&nn->nn_timeout, 0);
1929 o2net_set_nn_state(nn, sc, 0, 0);
1930 spin_unlock(&nn->nn_lock);
1931
1932 o2net_register_callbacks(sc->sc_sock->sk, sc);
1933 o2net_sc_queue_work(sc, &sc->sc_rx_work);
1934
1935 o2net_initialize_handshake();
1936 o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
1937
1938out:
1939 if (new_sock)
1940 sock_release(new_sock);
1941 if (node)
1942 o2nm_node_put(node);
1943 if (local_node)
1944 o2nm_node_put(local_node);
1945 if (sc)
1946 sc_put(sc);
1947 return ret;
1948}
1949
1950static void o2net_accept_many(struct work_struct *work)
1951{
1952 struct socket *sock = o2net_listen_sock;
1953 while (o2net_accept_one(sock) == 0)
1954 cond_resched();
1955}
1956
1957static void o2net_listen_data_ready(struct sock *sk, int bytes)
1958{
1959 void (*ready)(struct sock *sk, int bytes);
1960
1961 read_lock(&sk->sk_callback_lock);
1962 ready = sk->sk_user_data;
1963 if (ready == NULL) { /* check for teardown race */
1964 ready = sk->sk_data_ready;
1965 goto out;
1966 }
1967
1968 /* ->sk_data_ready is also called for a newly established child socket
1969 * before it has been accepted and the acceptor has set up their
1970 * data_ready.. we only want to queue listen work for our listening
1971 * socket */
1972 if (sk->sk_state == TCP_LISTEN) {
1973 mlog(ML_TCP, "bytes: %d\n", bytes);
1974 queue_work(o2net_wq, &o2net_listen_work);
1975 }
1976
1977out:
1978 read_unlock(&sk->sk_callback_lock);
1979 ready(sk, bytes);
1980}
1981
1982static int o2net_open_listening_sock(__be32 addr, __be16 port)
1983{
1984 struct socket *sock = NULL;
1985 int ret;
1986 struct sockaddr_in sin = {
1987 .sin_family = PF_INET,
1988 .sin_addr = { .s_addr = addr },
1989 .sin_port = port,
1990 };
1991
1992 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
1993 if (ret < 0) {
1994 printk(KERN_ERR "o2net: Error %d while creating socket\n", ret);
1995 goto out;
1996 }
1997
1998 sock->sk->sk_allocation = GFP_ATOMIC;
1999
2000 write_lock_bh(&sock->sk->sk_callback_lock);
2001 sock->sk->sk_user_data = sock->sk->sk_data_ready;
2002 sock->sk->sk_data_ready = o2net_listen_data_ready;
2003 write_unlock_bh(&sock->sk->sk_callback_lock);
2004
2005 o2net_listen_sock = sock;
2006 INIT_WORK(&o2net_listen_work, o2net_accept_many);
2007
2008 sock->sk->sk_reuse = SK_CAN_REUSE;
2009 ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin));
2010 if (ret < 0) {
2011 printk(KERN_ERR "o2net: Error %d while binding socket at "
2012 "%pI4:%u\n", ret, &addr, ntohs(port));
2013 goto out;
2014 }
2015
2016 ret = sock->ops->listen(sock, 64);
2017 if (ret < 0)
2018 printk(KERN_ERR "o2net: Error %d while listening on %pI4:%u\n",
2019 ret, &addr, ntohs(port));
2020
2021out:
2022 if (ret) {
2023 o2net_listen_sock = NULL;
2024 if (sock)
2025 sock_release(sock);
2026 }
2027 return ret;
2028}
2029
2030/*
2031 * called from node manager when we should bring up our network listening
2032 * socket. node manager handles all the serialization to only call this
2033 * once and to match it with o2net_stop_listening(). note,
2034 * o2nm_this_node() doesn't work yet as we're being called while it
2035 * is being set up.
2036 */
2037int o2net_start_listening(struct o2nm_node *node)
2038{
2039 int ret = 0;
2040
2041 BUG_ON(o2net_wq != NULL);
2042 BUG_ON(o2net_listen_sock != NULL);
2043
2044 mlog(ML_KTHREAD, "starting o2net thread...\n");
2045 o2net_wq = create_singlethread_workqueue("o2net");
2046 if (o2net_wq == NULL) {
2047 mlog(ML_ERROR, "unable to launch o2net thread\n");
2048 return -ENOMEM; /* ? */
2049 }
2050
2051 ret = o2net_open_listening_sock(node->nd_ipv4_address,
2052 node->nd_ipv4_port);
2053 if (ret) {
2054 destroy_workqueue(o2net_wq);
2055 o2net_wq = NULL;
2056 } else
2057 o2quo_conn_up(node->nd_num);
2058
2059 return ret;
2060}
2061
2062/* again, o2nm_this_node() doesn't work here as we're involved in
2063 * tearing it down */
2064void o2net_stop_listening(struct o2nm_node *node)
2065{
2066 struct socket *sock = o2net_listen_sock;
2067 size_t i;
2068
2069 BUG_ON(o2net_wq == NULL);
2070 BUG_ON(o2net_listen_sock == NULL);
2071
2072 /* stop the listening socket from generating work */
2073 write_lock_bh(&sock->sk->sk_callback_lock);
2074 sock->sk->sk_data_ready = sock->sk->sk_user_data;
2075 sock->sk->sk_user_data = NULL;
2076 write_unlock_bh(&sock->sk->sk_callback_lock);
2077
2078 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2079 struct o2nm_node *node = o2nm_get_node_by_num(i);
2080 if (node) {
2081 o2net_disconnect_node(node);
2082 o2nm_node_put(node);
2083 }
2084 }
2085
2086 /* finish all work and tear down the work queue */
2087 mlog(ML_KTHREAD, "waiting for o2net thread to exit....\n");
2088 destroy_workqueue(o2net_wq);
2089 o2net_wq = NULL;
2090
2091 sock_release(o2net_listen_sock);
2092 o2net_listen_sock = NULL;
2093
2094 o2quo_conn_err(node->nd_num);
2095}
2096
2097/* ------------------------------------------------------------ */
2098
2099int o2net_init(void)
2100{
2101 unsigned long i;
2102
2103 o2quo_init();
2104
2105 if (o2net_debugfs_init())
2106 return -ENOMEM;
2107
2108 o2net_hand = kzalloc(sizeof(struct o2net_handshake), GFP_KERNEL);
2109 o2net_keep_req = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2110 o2net_keep_resp = kzalloc(sizeof(struct o2net_msg), GFP_KERNEL);
2111 if (!o2net_hand || !o2net_keep_req || !o2net_keep_resp) {
2112 kfree(o2net_hand);
2113 kfree(o2net_keep_req);
2114 kfree(o2net_keep_resp);
2115 return -ENOMEM;
2116 }
2117
2118 o2net_hand->protocol_version = cpu_to_be64(O2NET_PROTOCOL_VERSION);
2119 o2net_hand->connector_id = cpu_to_be64(1);
2120
2121 o2net_keep_req->magic = cpu_to_be16(O2NET_MSG_KEEP_REQ_MAGIC);
2122 o2net_keep_resp->magic = cpu_to_be16(O2NET_MSG_KEEP_RESP_MAGIC);
2123
2124 for (i = 0; i < ARRAY_SIZE(o2net_nodes); i++) {
2125 struct o2net_node *nn = o2net_nn_from_num(i);
2126
2127 atomic_set(&nn->nn_timeout, 0);
2128 spin_lock_init(&nn->nn_lock);
2129 INIT_DELAYED_WORK(&nn->nn_connect_work, o2net_start_connect);
2130 INIT_DELAYED_WORK(&nn->nn_connect_expired,
2131 o2net_connect_expired);
2132 INIT_DELAYED_WORK(&nn->nn_still_up, o2net_still_up);
2133 /* until we see hb from a node we'll return einval */
2134 nn->nn_persistent_error = -ENOTCONN;
2135 init_waitqueue_head(&nn->nn_sc_wq);
2136 idr_init(&nn->nn_status_idr);
2137 INIT_LIST_HEAD(&nn->nn_status_list);
2138 }
2139
2140 return 0;
2141}
2142
2143void o2net_exit(void)
2144{
2145 o2quo_exit();
2146 kfree(o2net_hand);
2147 kfree(o2net_keep_req);
2148 kfree(o2net_keep_resp);
2149 o2net_debugfs_exit();
2150}