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70041088 AG |
1 | /* |
2 | * Copyright (c) 2006 Oracle. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | */ | |
33 | #include <linux/kernel.h> | |
5a0e3ad6 | 34 | #include <linux/slab.h> |
70041088 | 35 | #include <linux/in.h> |
3a9a231d | 36 | #include <linux/module.h> |
70041088 | 37 | #include <net/tcp.h> |
467fa153 SV |
38 | #include <net/net_namespace.h> |
39 | #include <net/netns/generic.h> | |
70041088 AG |
40 | |
41 | #include "rds.h" | |
42 | #include "tcp.h" | |
43 | ||
44 | /* only for info exporting */ | |
45 | static DEFINE_SPINLOCK(rds_tcp_tc_list_lock); | |
46 | static LIST_HEAD(rds_tcp_tc_list); | |
ff51bf84 | 47 | static unsigned int rds_tcp_tc_count; |
70041088 AG |
48 | |
49 | /* Track rds_tcp_connection structs so they can be cleaned up */ | |
50 | static DEFINE_SPINLOCK(rds_tcp_conn_lock); | |
51 | static LIST_HEAD(rds_tcp_conn_list); | |
52 | ||
53 | static struct kmem_cache *rds_tcp_conn_slab; | |
54 | ||
c6a58ffe SV |
55 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, |
56 | void __user *buffer, size_t *lenp, | |
57 | loff_t *fpos); | |
58 | ||
59 | int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF; | |
60 | int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF; | |
61 | ||
62 | static struct ctl_table rds_tcp_sysctl_table[] = { | |
63 | #define RDS_TCP_SNDBUF 0 | |
64 | { | |
65 | .procname = "rds_tcp_sndbuf", | |
66 | /* data is per-net pointer */ | |
67 | .maxlen = sizeof(int), | |
68 | .mode = 0644, | |
69 | .proc_handler = rds_tcp_skbuf_handler, | |
70 | .extra1 = &rds_tcp_min_sndbuf, | |
71 | }, | |
72 | #define RDS_TCP_RCVBUF 1 | |
73 | { | |
74 | .procname = "rds_tcp_rcvbuf", | |
75 | /* data is per-net pointer */ | |
76 | .maxlen = sizeof(int), | |
77 | .mode = 0644, | |
78 | .proc_handler = rds_tcp_skbuf_handler, | |
79 | .extra1 = &rds_tcp_min_rcvbuf, | |
80 | }, | |
81 | { } | |
82 | }; | |
83 | ||
70041088 AG |
84 | /* doing it this way avoids calling tcp_sk() */ |
85 | void rds_tcp_nonagle(struct socket *sock) | |
86 | { | |
87 | mm_segment_t oldfs = get_fs(); | |
88 | int val = 1; | |
89 | ||
90 | set_fs(KERNEL_DS); | |
91 | sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val, | |
92 | sizeof(val)); | |
93 | set_fs(oldfs); | |
94 | } | |
95 | ||
70041088 AG |
96 | u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc) |
97 | { | |
98 | return tcp_sk(tc->t_sock->sk)->snd_nxt; | |
99 | } | |
100 | ||
101 | u32 rds_tcp_snd_una(struct rds_tcp_connection *tc) | |
102 | { | |
103 | return tcp_sk(tc->t_sock->sk)->snd_una; | |
104 | } | |
105 | ||
106 | void rds_tcp_restore_callbacks(struct socket *sock, | |
107 | struct rds_tcp_connection *tc) | |
108 | { | |
109 | rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc); | |
110 | write_lock_bh(&sock->sk->sk_callback_lock); | |
111 | ||
112 | /* done under the callback_lock to serialize with write_space */ | |
113 | spin_lock(&rds_tcp_tc_list_lock); | |
114 | list_del_init(&tc->t_list_item); | |
115 | rds_tcp_tc_count--; | |
116 | spin_unlock(&rds_tcp_tc_list_lock); | |
117 | ||
118 | tc->t_sock = NULL; | |
119 | ||
120 | sock->sk->sk_write_space = tc->t_orig_write_space; | |
121 | sock->sk->sk_data_ready = tc->t_orig_data_ready; | |
122 | sock->sk->sk_state_change = tc->t_orig_state_change; | |
123 | sock->sk->sk_user_data = NULL; | |
124 | ||
125 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
126 | } | |
127 | ||
128 | /* | |
335b48d9 SV |
129 | * rds_tcp_reset_callbacks() switches the to the new sock and |
130 | * returns the existing tc->t_sock. | |
131 | * | |
132 | * The only functions that set tc->t_sock are rds_tcp_set_callbacks | |
133 | * and rds_tcp_reset_callbacks. Send and receive trust that | |
134 | * it is set. The absence of RDS_CONN_UP bit protects those paths | |
135 | * from being called while it isn't set. | |
136 | */ | |
137 | void rds_tcp_reset_callbacks(struct socket *sock, | |
138 | struct rds_connection *conn) | |
139 | { | |
140 | struct rds_tcp_connection *tc = conn->c_transport_data; | |
141 | struct socket *osock = tc->t_sock; | |
142 | ||
143 | if (!osock) | |
144 | goto newsock; | |
145 | ||
146 | /* Need to resolve a duelling SYN between peers. | |
147 | * We have an outstanding SYN to this peer, which may | |
148 | * potentially have transitioned to the RDS_CONN_UP state, | |
149 | * so we must quiesce any send threads before resetting | |
150 | * c_transport_data. We quiesce these threads by setting | |
9c79440e | 151 | * c_state to something other than RDS_CONN_UP, and then |
335b48d9 SV |
152 | * waiting for any existing threads in rds_send_xmit to |
153 | * complete release_in_xmit(). (Subsequent threads entering | |
154 | * rds_send_xmit() will bail on !rds_conn_up(). | |
9c79440e SV |
155 | * |
156 | * However an incoming syn-ack at this point would end up | |
157 | * marking the conn as RDS_CONN_UP, and would again permit | |
158 | * rds_send_xmi() threads through, so ideally we would | |
159 | * synchronize on RDS_CONN_UP after lock_sock(), but cannot | |
160 | * do that: waiting on !RDS_IN_XMIT after lock_sock() may | |
161 | * end up deadlocking with tcp_sendmsg(), and the RDS_IN_XMIT | |
162 | * would not get set. As a result, we set c_state to | |
163 | * RDS_CONN_RESETTTING, to ensure that rds_tcp_state_change | |
164 | * cannot mark rds_conn_path_up() in the window before lock_sock() | |
335b48d9 | 165 | */ |
9c79440e SV |
166 | atomic_set(&conn->c_state, RDS_CONN_RESETTING); |
167 | wait_event(conn->c_waitq, !test_bit(RDS_IN_XMIT, &conn->c_flags)); | |
335b48d9 SV |
168 | lock_sock(osock->sk); |
169 | /* reset receive side state for rds_tcp_data_recv() for osock */ | |
170 | if (tc->t_tinc) { | |
171 | rds_inc_put(&tc->t_tinc->ti_inc); | |
172 | tc->t_tinc = NULL; | |
173 | } | |
174 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); | |
175 | tc->t_tinc_data_rem = 0; | |
176 | tc->t_sock = NULL; | |
177 | ||
178 | write_lock_bh(&osock->sk->sk_callback_lock); | |
179 | ||
180 | osock->sk->sk_user_data = NULL; | |
181 | osock->sk->sk_data_ready = tc->t_orig_data_ready; | |
182 | osock->sk->sk_write_space = tc->t_orig_write_space; | |
183 | osock->sk->sk_state_change = tc->t_orig_state_change; | |
184 | write_unlock_bh(&osock->sk->sk_callback_lock); | |
185 | release_sock(osock->sk); | |
186 | sock_release(osock); | |
187 | newsock: | |
0b6f760c | 188 | rds_send_reset(conn); |
335b48d9 SV |
189 | lock_sock(sock->sk); |
190 | write_lock_bh(&sock->sk->sk_callback_lock); | |
191 | tc->t_sock = sock; | |
192 | sock->sk->sk_user_data = conn; | |
193 | sock->sk->sk_data_ready = rds_tcp_data_ready; | |
194 | sock->sk->sk_write_space = rds_tcp_write_space; | |
195 | sock->sk->sk_state_change = rds_tcp_state_change; | |
196 | ||
197 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
198 | release_sock(sock->sk); | |
199 | } | |
200 | ||
201 | /* Add tc to rds_tcp_tc_list and set tc->t_sock. See comments | |
202 | * above rds_tcp_reset_callbacks for notes about synchronization | |
203 | * with data path | |
70041088 AG |
204 | */ |
205 | void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn) | |
206 | { | |
207 | struct rds_tcp_connection *tc = conn->c_transport_data; | |
208 | ||
209 | rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); | |
210 | write_lock_bh(&sock->sk->sk_callback_lock); | |
211 | ||
212 | /* done under the callback_lock to serialize with write_space */ | |
213 | spin_lock(&rds_tcp_tc_list_lock); | |
214 | list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); | |
215 | rds_tcp_tc_count++; | |
216 | spin_unlock(&rds_tcp_tc_list_lock); | |
217 | ||
218 | /* accepted sockets need our listen data ready undone */ | |
219 | if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) | |
220 | sock->sk->sk_data_ready = sock->sk->sk_user_data; | |
221 | ||
222 | tc->t_sock = sock; | |
223 | tc->conn = conn; | |
224 | tc->t_orig_data_ready = sock->sk->sk_data_ready; | |
225 | tc->t_orig_write_space = sock->sk->sk_write_space; | |
226 | tc->t_orig_state_change = sock->sk->sk_state_change; | |
227 | ||
228 | sock->sk->sk_user_data = conn; | |
229 | sock->sk->sk_data_ready = rds_tcp_data_ready; | |
230 | sock->sk->sk_write_space = rds_tcp_write_space; | |
231 | sock->sk->sk_state_change = rds_tcp_state_change; | |
232 | ||
233 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
234 | } | |
235 | ||
236 | static void rds_tcp_tc_info(struct socket *sock, unsigned int len, | |
237 | struct rds_info_iterator *iter, | |
238 | struct rds_info_lengths *lens) | |
239 | { | |
240 | struct rds_info_tcp_socket tsinfo; | |
241 | struct rds_tcp_connection *tc; | |
242 | unsigned long flags; | |
243 | struct sockaddr_in sin; | |
244 | int sinlen; | |
245 | ||
246 | spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); | |
247 | ||
248 | if (len / sizeof(tsinfo) < rds_tcp_tc_count) | |
249 | goto out; | |
250 | ||
251 | list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { | |
252 | ||
253 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0); | |
254 | tsinfo.local_addr = sin.sin_addr.s_addr; | |
255 | tsinfo.local_port = sin.sin_port; | |
256 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1); | |
257 | tsinfo.peer_addr = sin.sin_addr.s_addr; | |
258 | tsinfo.peer_port = sin.sin_port; | |
259 | ||
260 | tsinfo.hdr_rem = tc->t_tinc_hdr_rem; | |
261 | tsinfo.data_rem = tc->t_tinc_data_rem; | |
262 | tsinfo.last_sent_nxt = tc->t_last_sent_nxt; | |
263 | tsinfo.last_expected_una = tc->t_last_expected_una; | |
264 | tsinfo.last_seen_una = tc->t_last_seen_una; | |
265 | ||
266 | rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); | |
267 | } | |
268 | ||
269 | out: | |
270 | lens->nr = rds_tcp_tc_count; | |
271 | lens->each = sizeof(tsinfo); | |
272 | ||
273 | spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); | |
274 | } | |
275 | ||
d5a8ac28 | 276 | static int rds_tcp_laddr_check(struct net *net, __be32 addr) |
70041088 | 277 | { |
d5a8ac28 | 278 | if (inet_addr_type(net, addr) == RTN_LOCAL) |
70041088 AG |
279 | return 0; |
280 | return -EADDRNOTAVAIL; | |
281 | } | |
282 | ||
283 | static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) | |
284 | { | |
285 | struct rds_tcp_connection *tc; | |
286 | ||
287 | tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); | |
8690bfa1 | 288 | if (!tc) |
70041088 AG |
289 | return -ENOMEM; |
290 | ||
bd7c5f98 | 291 | mutex_init(&tc->t_conn_lock); |
70041088 AG |
292 | tc->t_sock = NULL; |
293 | tc->t_tinc = NULL; | |
294 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); | |
295 | tc->t_tinc_data_rem = 0; | |
296 | ||
297 | conn->c_transport_data = tc; | |
298 | ||
299 | spin_lock_irq(&rds_tcp_conn_lock); | |
300 | list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); | |
301 | spin_unlock_irq(&rds_tcp_conn_lock); | |
302 | ||
303 | rdsdebug("alloced tc %p\n", conn->c_transport_data); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static void rds_tcp_conn_free(void *arg) | |
308 | { | |
309 | struct rds_tcp_connection *tc = arg; | |
8200a59f | 310 | unsigned long flags; |
70041088 | 311 | rdsdebug("freeing tc %p\n", tc); |
8200a59f PE |
312 | |
313 | spin_lock_irqsave(&rds_tcp_conn_lock, flags); | |
314 | list_del(&tc->t_tcp_node); | |
315 | spin_unlock_irqrestore(&rds_tcp_conn_lock, flags); | |
316 | ||
70041088 AG |
317 | kmem_cache_free(rds_tcp_conn_slab, tc); |
318 | } | |
319 | ||
320 | static void rds_tcp_destroy_conns(void) | |
321 | { | |
322 | struct rds_tcp_connection *tc, *_tc; | |
323 | LIST_HEAD(tmp_list); | |
324 | ||
325 | /* avoid calling conn_destroy with irqs off */ | |
326 | spin_lock_irq(&rds_tcp_conn_lock); | |
327 | list_splice(&rds_tcp_conn_list, &tmp_list); | |
328 | INIT_LIST_HEAD(&rds_tcp_conn_list); | |
329 | spin_unlock_irq(&rds_tcp_conn_lock); | |
330 | ||
331 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { | |
332 | if (tc->conn->c_passive) | |
333 | rds_conn_destroy(tc->conn->c_passive); | |
334 | rds_conn_destroy(tc->conn); | |
335 | } | |
336 | } | |
337 | ||
467fa153 | 338 | static void rds_tcp_exit(void); |
70041088 AG |
339 | |
340 | struct rds_transport rds_tcp_transport = { | |
341 | .laddr_check = rds_tcp_laddr_check, | |
342 | .xmit_prepare = rds_tcp_xmit_prepare, | |
343 | .xmit_complete = rds_tcp_xmit_complete, | |
70041088 AG |
344 | .xmit = rds_tcp_xmit, |
345 | .recv = rds_tcp_recv, | |
346 | .conn_alloc = rds_tcp_conn_alloc, | |
347 | .conn_free = rds_tcp_conn_free, | |
348 | .conn_connect = rds_tcp_conn_connect, | |
349 | .conn_shutdown = rds_tcp_conn_shutdown, | |
350 | .inc_copy_to_user = rds_tcp_inc_copy_to_user, | |
70041088 AG |
351 | .inc_free = rds_tcp_inc_free, |
352 | .stats_info_copy = rds_tcp_stats_info_copy, | |
353 | .exit = rds_tcp_exit, | |
354 | .t_owner = THIS_MODULE, | |
355 | .t_name = "tcp", | |
335776bd | 356 | .t_type = RDS_TRANS_TCP, |
70041088 AG |
357 | .t_prefer_loopback = 1, |
358 | }; | |
359 | ||
467fa153 SV |
360 | static int rds_tcp_netid; |
361 | ||
362 | /* per-network namespace private data for this module */ | |
363 | struct rds_tcp_net { | |
364 | struct socket *rds_tcp_listen_sock; | |
365 | struct work_struct rds_tcp_accept_w; | |
c6a58ffe SV |
366 | struct ctl_table_header *rds_tcp_sysctl; |
367 | struct ctl_table *ctl_table; | |
368 | int sndbuf_size; | |
369 | int rcvbuf_size; | |
467fa153 SV |
370 | }; |
371 | ||
c6a58ffe SV |
372 | /* All module specific customizations to the RDS-TCP socket should be done in |
373 | * rds_tcp_tune() and applied after socket creation. | |
374 | */ | |
375 | void rds_tcp_tune(struct socket *sock) | |
376 | { | |
377 | struct sock *sk = sock->sk; | |
378 | struct net *net = sock_net(sk); | |
379 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
380 | ||
381 | rds_tcp_nonagle(sock); | |
382 | lock_sock(sk); | |
383 | if (rtn->sndbuf_size > 0) { | |
384 | sk->sk_sndbuf = rtn->sndbuf_size; | |
385 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
386 | } | |
387 | if (rtn->rcvbuf_size > 0) { | |
388 | sk->sk_sndbuf = rtn->rcvbuf_size; | |
389 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
390 | } | |
391 | release_sock(sk); | |
392 | } | |
393 | ||
467fa153 SV |
394 | static void rds_tcp_accept_worker(struct work_struct *work) |
395 | { | |
396 | struct rds_tcp_net *rtn = container_of(work, | |
397 | struct rds_tcp_net, | |
398 | rds_tcp_accept_w); | |
399 | ||
400 | while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0) | |
401 | cond_resched(); | |
402 | } | |
403 | ||
404 | void rds_tcp_accept_work(struct sock *sk) | |
405 | { | |
406 | struct net *net = sock_net(sk); | |
407 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
408 | ||
409 | queue_work(rds_wq, &rtn->rds_tcp_accept_w); | |
410 | } | |
411 | ||
412 | static __net_init int rds_tcp_init_net(struct net *net) | |
413 | { | |
414 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
c6a58ffe SV |
415 | struct ctl_table *tbl; |
416 | int err = 0; | |
467fa153 | 417 | |
c6a58ffe SV |
418 | memset(rtn, 0, sizeof(*rtn)); |
419 | ||
420 | /* {snd, rcv}buf_size default to 0, which implies we let the | |
421 | * stack pick the value, and permit auto-tuning of buffer size. | |
422 | */ | |
423 | if (net == &init_net) { | |
424 | tbl = rds_tcp_sysctl_table; | |
425 | } else { | |
426 | tbl = kmemdup(rds_tcp_sysctl_table, | |
427 | sizeof(rds_tcp_sysctl_table), GFP_KERNEL); | |
428 | if (!tbl) { | |
429 | pr_warn("could not set allocate syctl table\n"); | |
430 | return -ENOMEM; | |
431 | } | |
432 | rtn->ctl_table = tbl; | |
433 | } | |
434 | tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; | |
435 | tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; | |
436 | rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl); | |
437 | if (!rtn->rds_tcp_sysctl) { | |
438 | pr_warn("could not register sysctl\n"); | |
439 | err = -ENOMEM; | |
440 | goto fail; | |
441 | } | |
467fa153 SV |
442 | rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net); |
443 | if (!rtn->rds_tcp_listen_sock) { | |
444 | pr_warn("could not set up listen sock\n"); | |
c6a58ffe SV |
445 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
446 | rtn->rds_tcp_sysctl = NULL; | |
447 | err = -EAFNOSUPPORT; | |
448 | goto fail; | |
467fa153 SV |
449 | } |
450 | INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); | |
451 | return 0; | |
c6a58ffe SV |
452 | |
453 | fail: | |
454 | if (net != &init_net) | |
455 | kfree(tbl); | |
456 | return err; | |
467fa153 SV |
457 | } |
458 | ||
459 | static void __net_exit rds_tcp_exit_net(struct net *net) | |
460 | { | |
461 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
462 | ||
c6a58ffe SV |
463 | if (rtn->rds_tcp_sysctl) |
464 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); | |
465 | ||
466 | if (net != &init_net && rtn->ctl_table) | |
467 | kfree(rtn->ctl_table); | |
468 | ||
467fa153 SV |
469 | /* If rds_tcp_exit_net() is called as a result of netns deletion, |
470 | * the rds_tcp_kill_sock() device notifier would already have cleaned | |
471 | * up the listen socket, thus there is no work to do in this function. | |
472 | * | |
473 | * If rds_tcp_exit_net() is called as a result of module unload, | |
474 | * i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then | |
475 | * we do need to clean up the listen socket here. | |
476 | */ | |
477 | if (rtn->rds_tcp_listen_sock) { | |
478 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); | |
479 | rtn->rds_tcp_listen_sock = NULL; | |
480 | flush_work(&rtn->rds_tcp_accept_w); | |
481 | } | |
482 | } | |
483 | ||
484 | static struct pernet_operations rds_tcp_net_ops = { | |
485 | .init = rds_tcp_init_net, | |
486 | .exit = rds_tcp_exit_net, | |
487 | .id = &rds_tcp_netid, | |
488 | .size = sizeof(struct rds_tcp_net), | |
489 | }; | |
490 | ||
491 | static void rds_tcp_kill_sock(struct net *net) | |
492 | { | |
493 | struct rds_tcp_connection *tc, *_tc; | |
494 | struct sock *sk; | |
495 | LIST_HEAD(tmp_list); | |
496 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); | |
497 | ||
498 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); | |
499 | rtn->rds_tcp_listen_sock = NULL; | |
500 | flush_work(&rtn->rds_tcp_accept_w); | |
501 | spin_lock_irq(&rds_tcp_conn_lock); | |
502 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { | |
503 | struct net *c_net = read_pnet(&tc->conn->c_net); | |
504 | ||
505 | if (net != c_net || !tc->t_sock) | |
506 | continue; | |
507 | list_move_tail(&tc->t_tcp_node, &tmp_list); | |
508 | } | |
509 | spin_unlock_irq(&rds_tcp_conn_lock); | |
510 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { | |
511 | sk = tc->t_sock->sk; | |
512 | sk->sk_prot->disconnect(sk, 0); | |
513 | tcp_done(sk); | |
514 | if (tc->conn->c_passive) | |
515 | rds_conn_destroy(tc->conn->c_passive); | |
516 | rds_conn_destroy(tc->conn); | |
517 | } | |
518 | } | |
519 | ||
520 | static int rds_tcp_dev_event(struct notifier_block *this, | |
521 | unsigned long event, void *ptr) | |
522 | { | |
523 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
524 | ||
525 | /* rds-tcp registers as a pernet subys, so the ->exit will only | |
526 | * get invoked after network acitivity has quiesced. We need to | |
527 | * clean up all sockets to quiesce network activity, and use | |
528 | * the unregistration of the per-net loopback device as a trigger | |
529 | * to start that cleanup. | |
530 | */ | |
531 | if (event == NETDEV_UNREGISTER_FINAL && | |
532 | dev->ifindex == LOOPBACK_IFINDEX) | |
533 | rds_tcp_kill_sock(dev_net(dev)); | |
534 | ||
535 | return NOTIFY_DONE; | |
536 | } | |
537 | ||
538 | static struct notifier_block rds_tcp_dev_notifier = { | |
539 | .notifier_call = rds_tcp_dev_event, | |
540 | .priority = -10, /* must be called after other network notifiers */ | |
541 | }; | |
542 | ||
c6a58ffe SV |
543 | /* when sysctl is used to modify some kernel socket parameters,this |
544 | * function resets the RDS connections in that netns so that we can | |
545 | * restart with new parameters. The assumption is that such reset | |
546 | * events are few and far-between. | |
547 | */ | |
548 | static void rds_tcp_sysctl_reset(struct net *net) | |
549 | { | |
550 | struct rds_tcp_connection *tc, *_tc; | |
551 | ||
552 | spin_lock_irq(&rds_tcp_conn_lock); | |
553 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { | |
554 | struct net *c_net = read_pnet(&tc->conn->c_net); | |
555 | ||
556 | if (net != c_net || !tc->t_sock) | |
557 | continue; | |
558 | ||
559 | rds_conn_drop(tc->conn); /* reconnect with new parameters */ | |
560 | } | |
561 | spin_unlock_irq(&rds_tcp_conn_lock); | |
562 | } | |
563 | ||
564 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, | |
565 | void __user *buffer, size_t *lenp, | |
566 | loff_t *fpos) | |
567 | { | |
568 | struct net *net = current->nsproxy->net_ns; | |
569 | int err; | |
570 | ||
571 | err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos); | |
572 | if (err < 0) { | |
573 | pr_warn("Invalid input. Must be >= %d\n", | |
574 | *(int *)(ctl->extra1)); | |
575 | return err; | |
576 | } | |
577 | if (write) | |
578 | rds_tcp_sysctl_reset(net); | |
579 | return 0; | |
580 | } | |
581 | ||
467fa153 SV |
582 | static void rds_tcp_exit(void) |
583 | { | |
584 | rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); | |
585 | unregister_pernet_subsys(&rds_tcp_net_ops); | |
586 | if (unregister_netdevice_notifier(&rds_tcp_dev_notifier)) | |
587 | pr_warn("could not unregister rds_tcp_dev_notifier\n"); | |
588 | rds_tcp_destroy_conns(); | |
589 | rds_trans_unregister(&rds_tcp_transport); | |
590 | rds_tcp_recv_exit(); | |
591 | kmem_cache_destroy(rds_tcp_conn_slab); | |
592 | } | |
593 | module_exit(rds_tcp_exit); | |
594 | ||
ff51bf84 | 595 | static int rds_tcp_init(void) |
70041088 AG |
596 | { |
597 | int ret; | |
598 | ||
599 | rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", | |
600 | sizeof(struct rds_tcp_connection), | |
601 | 0, 0, NULL); | |
8690bfa1 | 602 | if (!rds_tcp_conn_slab) { |
70041088 AG |
603 | ret = -ENOMEM; |
604 | goto out; | |
605 | } | |
606 | ||
467fa153 SV |
607 | ret = register_netdevice_notifier(&rds_tcp_dev_notifier); |
608 | if (ret) { | |
609 | pr_warn("could not register rds_tcp_dev_notifier\n"); | |
610 | goto out; | |
611 | } | |
612 | ||
613 | ret = register_pernet_subsys(&rds_tcp_net_ops); | |
614 | if (ret) | |
615 | goto out_slab; | |
616 | ||
70041088 AG |
617 | ret = rds_tcp_recv_init(); |
618 | if (ret) | |
3dad5424 | 619 | goto out_pernet; |
70041088 AG |
620 | |
621 | ret = rds_trans_register(&rds_tcp_transport); | |
622 | if (ret) | |
623 | goto out_recv; | |
624 | ||
70041088 AG |
625 | rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
626 | ||
627 | goto out; | |
628 | ||
70041088 AG |
629 | out_recv: |
630 | rds_tcp_recv_exit(); | |
3dad5424 | 631 | out_pernet: |
467fa153 | 632 | unregister_pernet_subsys(&rds_tcp_net_ops); |
3dad5424 | 633 | out_slab: |
70041088 AG |
634 | kmem_cache_destroy(rds_tcp_conn_slab); |
635 | out: | |
636 | return ret; | |
637 | } | |
638 | module_init(rds_tcp_init); | |
639 | ||
640 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
641 | MODULE_DESCRIPTION("RDS: TCP transport"); | |
642 | MODULE_LICENSE("Dual BSD/GPL"); | |
643 |