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639b321b 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/module.h> | |
34 | #include <linux/errno.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/in.h> | |
37 | #include <linux/poll.h> | |
639b321b AG |
38 | #include <net/sock.h> |
39 | ||
40 | #include "rds.h" | |
41 | #include "rdma.h" | |
639b321b AG |
42 | |
43 | /* this is just used for stats gathering :/ */ | |
44 | static DEFINE_SPINLOCK(rds_sock_lock); | |
45 | static unsigned long rds_sock_count; | |
46 | static LIST_HEAD(rds_sock_list); | |
47 | DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq); | |
48 | ||
49 | /* | |
50 | * This is called as the final descriptor referencing this socket is closed. | |
51 | * We have to unbind the socket so that another socket can be bound to the | |
52 | * address it was using. | |
53 | * | |
54 | * We have to be careful about racing with the incoming path. sock_orphan() | |
55 | * sets SOCK_DEAD and we use that as an indicator to the rx path that new | |
56 | * messages shouldn't be queued. | |
57 | */ | |
58 | static int rds_release(struct socket *sock) | |
59 | { | |
60 | struct sock *sk = sock->sk; | |
61 | struct rds_sock *rs; | |
62 | unsigned long flags; | |
63 | ||
64 | if (sk == NULL) | |
65 | goto out; | |
66 | ||
67 | rs = rds_sk_to_rs(sk); | |
68 | ||
69 | sock_orphan(sk); | |
70 | /* Note - rds_clear_recv_queue grabs rs_recv_lock, so | |
71 | * that ensures the recv path has completed messing | |
72 | * with the socket. */ | |
73 | rds_clear_recv_queue(rs); | |
74 | rds_cong_remove_socket(rs); | |
75 | rds_remove_bound(rs); | |
76 | rds_send_drop_to(rs, NULL); | |
77 | rds_rdma_drop_keys(rs); | |
78 | rds_notify_queue_get(rs, NULL); | |
79 | ||
80 | spin_lock_irqsave(&rds_sock_lock, flags); | |
81 | list_del_init(&rs->rs_item); | |
82 | rds_sock_count--; | |
83 | spin_unlock_irqrestore(&rds_sock_lock, flags); | |
84 | ||
85 | sock->sk = NULL; | |
86 | sock_put(sk); | |
87 | out: | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* | |
92 | * Careful not to race with rds_release -> sock_orphan which clears sk_sleep. | |
93 | * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK | |
94 | * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but | |
95 | * this seems more conservative. | |
96 | * NB - normally, one would use sk_callback_lock for this, but we can | |
97 | * get here from interrupts, whereas the network code grabs sk_callback_lock | |
98 | * with _lock_bh only - so relying on sk_callback_lock introduces livelocks. | |
99 | */ | |
100 | void rds_wake_sk_sleep(struct rds_sock *rs) | |
101 | { | |
102 | unsigned long flags; | |
103 | ||
104 | read_lock_irqsave(&rs->rs_recv_lock, flags); | |
105 | __rds_wake_sk_sleep(rds_rs_to_sk(rs)); | |
106 | read_unlock_irqrestore(&rs->rs_recv_lock, flags); | |
107 | } | |
108 | ||
109 | static int rds_getname(struct socket *sock, struct sockaddr *uaddr, | |
110 | int *uaddr_len, int peer) | |
111 | { | |
112 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
113 | struct rds_sock *rs = rds_sk_to_rs(sock->sk); | |
114 | ||
115 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
116 | ||
117 | /* racey, don't care */ | |
118 | if (peer) { | |
119 | if (!rs->rs_conn_addr) | |
120 | return -ENOTCONN; | |
121 | ||
122 | sin->sin_port = rs->rs_conn_port; | |
123 | sin->sin_addr.s_addr = rs->rs_conn_addr; | |
124 | } else { | |
125 | sin->sin_port = rs->rs_bound_port; | |
126 | sin->sin_addr.s_addr = rs->rs_bound_addr; | |
127 | } | |
128 | ||
129 | sin->sin_family = AF_INET; | |
130 | ||
131 | *uaddr_len = sizeof(*sin); | |
132 | return 0; | |
133 | } | |
134 | ||
135 | /* | |
136 | * RDS' poll is without a doubt the least intuitive part of the interface, | |
137 | * as POLLIN and POLLOUT do not behave entirely as you would expect from | |
138 | * a network protocol. | |
139 | * | |
140 | * POLLIN is asserted if | |
141 | * - there is data on the receive queue. | |
142 | * - to signal that a previously congested destination may have become | |
143 | * uncongested | |
144 | * - A notification has been queued to the socket (this can be a congestion | |
145 | * update, or a RDMA completion). | |
146 | * | |
147 | * POLLOUT is asserted if there is room on the send queue. This does not mean | |
148 | * however, that the next sendmsg() call will succeed. If the application tries | |
149 | * to send to a congested destination, the system call may still fail (and | |
150 | * return ENOBUFS). | |
151 | */ | |
152 | static unsigned int rds_poll(struct file *file, struct socket *sock, | |
153 | poll_table *wait) | |
154 | { | |
155 | struct sock *sk = sock->sk; | |
156 | struct rds_sock *rs = rds_sk_to_rs(sk); | |
157 | unsigned int mask = 0; | |
158 | unsigned long flags; | |
159 | ||
160 | poll_wait(file, sk->sk_sleep, wait); | |
161 | ||
162 | poll_wait(file, &rds_poll_waitq, wait); | |
163 | ||
164 | read_lock_irqsave(&rs->rs_recv_lock, flags); | |
165 | if (!rs->rs_cong_monitor) { | |
166 | /* When a congestion map was updated, we signal POLLIN for | |
167 | * "historical" reasons. Applications can also poll for | |
168 | * WRBAND instead. */ | |
169 | if (rds_cong_updated_since(&rs->rs_cong_track)) | |
170 | mask |= (POLLIN | POLLRDNORM | POLLWRBAND); | |
171 | } else { | |
172 | spin_lock(&rs->rs_lock); | |
173 | if (rs->rs_cong_notify) | |
174 | mask |= (POLLIN | POLLRDNORM); | |
175 | spin_unlock(&rs->rs_lock); | |
176 | } | |
177 | if (!list_empty(&rs->rs_recv_queue) | |
178 | || !list_empty(&rs->rs_notify_queue)) | |
179 | mask |= (POLLIN | POLLRDNORM); | |
180 | if (rs->rs_snd_bytes < rds_sk_sndbuf(rs)) | |
181 | mask |= (POLLOUT | POLLWRNORM); | |
182 | read_unlock_irqrestore(&rs->rs_recv_lock, flags); | |
183 | ||
184 | return mask; | |
185 | } | |
186 | ||
187 | static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
188 | { | |
189 | return -ENOIOCTLCMD; | |
190 | } | |
191 | ||
192 | static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval, | |
193 | int len) | |
194 | { | |
195 | struct sockaddr_in sin; | |
196 | int ret = 0; | |
197 | ||
198 | /* racing with another thread binding seems ok here */ | |
199 | if (rs->rs_bound_addr == 0) { | |
200 | ret = -ENOTCONN; /* XXX not a great errno */ | |
201 | goto out; | |
202 | } | |
203 | ||
204 | if (len < sizeof(struct sockaddr_in)) { | |
205 | ret = -EINVAL; | |
206 | goto out; | |
207 | } | |
208 | ||
209 | if (copy_from_user(&sin, optval, sizeof(sin))) { | |
210 | ret = -EFAULT; | |
211 | goto out; | |
212 | } | |
213 | ||
214 | rds_send_drop_to(rs, &sin); | |
215 | out: | |
216 | return ret; | |
217 | } | |
218 | ||
219 | static int rds_set_bool_option(unsigned char *optvar, char __user *optval, | |
220 | int optlen) | |
221 | { | |
222 | int value; | |
223 | ||
224 | if (optlen < sizeof(int)) | |
225 | return -EINVAL; | |
226 | if (get_user(value, (int __user *) optval)) | |
227 | return -EFAULT; | |
228 | *optvar = !!value; | |
229 | return 0; | |
230 | } | |
231 | ||
232 | static int rds_cong_monitor(struct rds_sock *rs, char __user *optval, | |
233 | int optlen) | |
234 | { | |
235 | int ret; | |
236 | ||
237 | ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen); | |
238 | if (ret == 0) { | |
239 | if (rs->rs_cong_monitor) { | |
240 | rds_cong_add_socket(rs); | |
241 | } else { | |
242 | rds_cong_remove_socket(rs); | |
243 | rs->rs_cong_mask = 0; | |
244 | rs->rs_cong_notify = 0; | |
245 | } | |
246 | } | |
247 | return ret; | |
248 | } | |
249 | ||
250 | static int rds_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 251 | char __user *optval, unsigned int optlen) |
639b321b AG |
252 | { |
253 | struct rds_sock *rs = rds_sk_to_rs(sock->sk); | |
254 | int ret; | |
255 | ||
256 | if (level != SOL_RDS) { | |
257 | ret = -ENOPROTOOPT; | |
258 | goto out; | |
259 | } | |
260 | ||
261 | switch (optname) { | |
262 | case RDS_CANCEL_SENT_TO: | |
263 | ret = rds_cancel_sent_to(rs, optval, optlen); | |
264 | break; | |
265 | case RDS_GET_MR: | |
266 | ret = rds_get_mr(rs, optval, optlen); | |
267 | break; | |
244546f0 AG |
268 | case RDS_GET_MR_FOR_DEST: |
269 | ret = rds_get_mr_for_dest(rs, optval, optlen); | |
270 | break; | |
639b321b AG |
271 | case RDS_FREE_MR: |
272 | ret = rds_free_mr(rs, optval, optlen); | |
273 | break; | |
274 | case RDS_RECVERR: | |
275 | ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen); | |
276 | break; | |
277 | case RDS_CONG_MONITOR: | |
278 | ret = rds_cong_monitor(rs, optval, optlen); | |
279 | break; | |
280 | default: | |
281 | ret = -ENOPROTOOPT; | |
282 | } | |
283 | out: | |
284 | return ret; | |
285 | } | |
286 | ||
287 | static int rds_getsockopt(struct socket *sock, int level, int optname, | |
288 | char __user *optval, int __user *optlen) | |
289 | { | |
290 | struct rds_sock *rs = rds_sk_to_rs(sock->sk); | |
291 | int ret = -ENOPROTOOPT, len; | |
292 | ||
293 | if (level != SOL_RDS) | |
294 | goto out; | |
295 | ||
296 | if (get_user(len, optlen)) { | |
297 | ret = -EFAULT; | |
298 | goto out; | |
299 | } | |
300 | ||
301 | switch (optname) { | |
302 | case RDS_INFO_FIRST ... RDS_INFO_LAST: | |
303 | ret = rds_info_getsockopt(sock, optname, optval, | |
304 | optlen); | |
305 | break; | |
306 | ||
307 | case RDS_RECVERR: | |
308 | if (len < sizeof(int)) | |
309 | ret = -EINVAL; | |
310 | else | |
311 | if (put_user(rs->rs_recverr, (int __user *) optval) | |
312 | || put_user(sizeof(int), optlen)) | |
313 | ret = -EFAULT; | |
314 | else | |
315 | ret = 0; | |
316 | break; | |
317 | default: | |
318 | break; | |
319 | } | |
320 | ||
321 | out: | |
322 | return ret; | |
323 | ||
324 | } | |
325 | ||
326 | static int rds_connect(struct socket *sock, struct sockaddr *uaddr, | |
327 | int addr_len, int flags) | |
328 | { | |
329 | struct sock *sk = sock->sk; | |
330 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; | |
331 | struct rds_sock *rs = rds_sk_to_rs(sk); | |
332 | int ret = 0; | |
333 | ||
334 | lock_sock(sk); | |
335 | ||
336 | if (addr_len != sizeof(struct sockaddr_in)) { | |
337 | ret = -EINVAL; | |
338 | goto out; | |
339 | } | |
340 | ||
341 | if (sin->sin_family != AF_INET) { | |
342 | ret = -EAFNOSUPPORT; | |
343 | goto out; | |
344 | } | |
345 | ||
346 | if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) { | |
347 | ret = -EDESTADDRREQ; | |
348 | goto out; | |
349 | } | |
350 | ||
351 | rs->rs_conn_addr = sin->sin_addr.s_addr; | |
352 | rs->rs_conn_port = sin->sin_port; | |
353 | ||
354 | out: | |
355 | release_sock(sk); | |
356 | return ret; | |
357 | } | |
358 | ||
359 | static struct proto rds_proto = { | |
360 | .name = "RDS", | |
361 | .owner = THIS_MODULE, | |
362 | .obj_size = sizeof(struct rds_sock), | |
363 | }; | |
364 | ||
5708e868 | 365 | static const struct proto_ops rds_proto_ops = { |
639b321b AG |
366 | .family = AF_RDS, |
367 | .owner = THIS_MODULE, | |
368 | .release = rds_release, | |
369 | .bind = rds_bind, | |
370 | .connect = rds_connect, | |
371 | .socketpair = sock_no_socketpair, | |
372 | .accept = sock_no_accept, | |
373 | .getname = rds_getname, | |
374 | .poll = rds_poll, | |
375 | .ioctl = rds_ioctl, | |
376 | .listen = sock_no_listen, | |
377 | .shutdown = sock_no_shutdown, | |
378 | .setsockopt = rds_setsockopt, | |
379 | .getsockopt = rds_getsockopt, | |
380 | .sendmsg = rds_sendmsg, | |
381 | .recvmsg = rds_recvmsg, | |
382 | .mmap = sock_no_mmap, | |
383 | .sendpage = sock_no_sendpage, | |
384 | }; | |
385 | ||
386 | static int __rds_create(struct socket *sock, struct sock *sk, int protocol) | |
387 | { | |
388 | unsigned long flags; | |
389 | struct rds_sock *rs; | |
390 | ||
391 | sock_init_data(sock, sk); | |
392 | sock->ops = &rds_proto_ops; | |
393 | sk->sk_protocol = protocol; | |
394 | ||
395 | rs = rds_sk_to_rs(sk); | |
396 | spin_lock_init(&rs->rs_lock); | |
397 | rwlock_init(&rs->rs_recv_lock); | |
398 | INIT_LIST_HEAD(&rs->rs_send_queue); | |
399 | INIT_LIST_HEAD(&rs->rs_recv_queue); | |
400 | INIT_LIST_HEAD(&rs->rs_notify_queue); | |
401 | INIT_LIST_HEAD(&rs->rs_cong_list); | |
402 | spin_lock_init(&rs->rs_rdma_lock); | |
403 | rs->rs_rdma_keys = RB_ROOT; | |
404 | ||
405 | spin_lock_irqsave(&rds_sock_lock, flags); | |
406 | list_add_tail(&rs->rs_item, &rds_sock_list); | |
407 | rds_sock_count++; | |
408 | spin_unlock_irqrestore(&rds_sock_lock, flags); | |
409 | ||
410 | return 0; | |
411 | } | |
412 | ||
3f378b68 EP |
413 | static int rds_create(struct net *net, struct socket *sock, int protocol, |
414 | int kern) | |
639b321b AG |
415 | { |
416 | struct sock *sk; | |
417 | ||
418 | if (sock->type != SOCK_SEQPACKET || protocol) | |
419 | return -ESOCKTNOSUPPORT; | |
420 | ||
421 | sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto); | |
422 | if (!sk) | |
423 | return -ENOMEM; | |
424 | ||
425 | return __rds_create(sock, sk, protocol); | |
426 | } | |
427 | ||
428 | void rds_sock_addref(struct rds_sock *rs) | |
429 | { | |
430 | sock_hold(rds_rs_to_sk(rs)); | |
431 | } | |
432 | ||
433 | void rds_sock_put(struct rds_sock *rs) | |
434 | { | |
435 | sock_put(rds_rs_to_sk(rs)); | |
436 | } | |
437 | ||
ec1b4cf7 | 438 | static const struct net_proto_family rds_family_ops = { |
639b321b AG |
439 | .family = AF_RDS, |
440 | .create = rds_create, | |
441 | .owner = THIS_MODULE, | |
442 | }; | |
443 | ||
444 | static void rds_sock_inc_info(struct socket *sock, unsigned int len, | |
445 | struct rds_info_iterator *iter, | |
446 | struct rds_info_lengths *lens) | |
447 | { | |
448 | struct rds_sock *rs; | |
449 | struct sock *sk; | |
450 | struct rds_incoming *inc; | |
451 | unsigned long flags; | |
452 | unsigned int total = 0; | |
453 | ||
454 | len /= sizeof(struct rds_info_message); | |
455 | ||
456 | spin_lock_irqsave(&rds_sock_lock, flags); | |
457 | ||
458 | list_for_each_entry(rs, &rds_sock_list, rs_item) { | |
459 | sk = rds_rs_to_sk(rs); | |
460 | read_lock(&rs->rs_recv_lock); | |
461 | ||
462 | /* XXX too lazy to maintain counts.. */ | |
463 | list_for_each_entry(inc, &rs->rs_recv_queue, i_item) { | |
464 | total++; | |
465 | if (total <= len) | |
466 | rds_inc_info_copy(inc, iter, inc->i_saddr, | |
467 | rs->rs_bound_addr, 1); | |
468 | } | |
469 | ||
470 | read_unlock(&rs->rs_recv_lock); | |
471 | } | |
472 | ||
473 | spin_unlock_irqrestore(&rds_sock_lock, flags); | |
474 | ||
475 | lens->nr = total; | |
476 | lens->each = sizeof(struct rds_info_message); | |
477 | } | |
478 | ||
479 | static void rds_sock_info(struct socket *sock, unsigned int len, | |
480 | struct rds_info_iterator *iter, | |
481 | struct rds_info_lengths *lens) | |
482 | { | |
483 | struct rds_info_socket sinfo; | |
484 | struct rds_sock *rs; | |
485 | unsigned long flags; | |
486 | ||
487 | len /= sizeof(struct rds_info_socket); | |
488 | ||
489 | spin_lock_irqsave(&rds_sock_lock, flags); | |
490 | ||
491 | if (len < rds_sock_count) | |
492 | goto out; | |
493 | ||
494 | list_for_each_entry(rs, &rds_sock_list, rs_item) { | |
495 | sinfo.sndbuf = rds_sk_sndbuf(rs); | |
496 | sinfo.rcvbuf = rds_sk_rcvbuf(rs); | |
497 | sinfo.bound_addr = rs->rs_bound_addr; | |
498 | sinfo.connected_addr = rs->rs_conn_addr; | |
499 | sinfo.bound_port = rs->rs_bound_port; | |
500 | sinfo.connected_port = rs->rs_conn_port; | |
501 | sinfo.inum = sock_i_ino(rds_rs_to_sk(rs)); | |
502 | ||
503 | rds_info_copy(iter, &sinfo, sizeof(sinfo)); | |
504 | } | |
505 | ||
506 | out: | |
507 | lens->nr = rds_sock_count; | |
508 | lens->each = sizeof(struct rds_info_socket); | |
509 | ||
510 | spin_unlock_irqrestore(&rds_sock_lock, flags); | |
511 | } | |
512 | ||
513 | static void __exit rds_exit(void) | |
514 | { | |
639b321b AG |
515 | sock_unregister(rds_family_ops.family); |
516 | proto_unregister(&rds_proto); | |
517 | rds_conn_exit(); | |
518 | rds_cong_exit(); | |
519 | rds_sysctl_exit(); | |
520 | rds_threads_exit(); | |
521 | rds_stats_exit(); | |
522 | rds_page_exit(); | |
523 | rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info); | |
524 | rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); | |
525 | } | |
526 | module_exit(rds_exit); | |
527 | ||
528 | static int __init rds_init(void) | |
529 | { | |
530 | int ret; | |
531 | ||
532 | ret = rds_conn_init(); | |
533 | if (ret) | |
534 | goto out; | |
535 | ret = rds_threads_init(); | |
536 | if (ret) | |
537 | goto out_conn; | |
538 | ret = rds_sysctl_init(); | |
539 | if (ret) | |
540 | goto out_threads; | |
541 | ret = rds_stats_init(); | |
542 | if (ret) | |
543 | goto out_sysctl; | |
544 | ret = proto_register(&rds_proto, 1); | |
545 | if (ret) | |
546 | goto out_stats; | |
547 | ret = sock_register(&rds_family_ops); | |
548 | if (ret) | |
549 | goto out_proto; | |
550 | ||
551 | rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info); | |
552 | rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info); | |
553 | ||
639b321b AG |
554 | goto out; |
555 | ||
639b321b AG |
556 | out_proto: |
557 | proto_unregister(&rds_proto); | |
558 | out_stats: | |
559 | rds_stats_exit(); | |
560 | out_sysctl: | |
561 | rds_sysctl_exit(); | |
562 | out_threads: | |
563 | rds_threads_exit(); | |
564 | out_conn: | |
565 | rds_conn_exit(); | |
566 | rds_cong_exit(); | |
567 | rds_page_exit(); | |
568 | out: | |
569 | return ret; | |
570 | } | |
571 | module_init(rds_init); | |
572 | ||
573 | #define DRV_VERSION "4.0" | |
574 | #define DRV_RELDATE "Feb 12, 2009" | |
575 | ||
576 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); | |
577 | MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets" | |
578 | " v" DRV_VERSION " (" DRV_RELDATE ")"); | |
579 | MODULE_VERSION(DRV_VERSION); | |
580 | MODULE_LICENSE("Dual BSD/GPL"); | |
581 | MODULE_ALIAS_NETPROTO(PF_RDS); |