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TOMOYO Linux Cross Reference
Linux/net/rds/af_rds.c

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  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/gfp.h>
 37 #include <linux/in.h>
 38 #include <linux/poll.h>
 39 #include <net/sock.h>
 40 
 41 #include "rds.h"
 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 
 63         if (!sk)
 64                 goto out;
 65 
 66         rs = rds_sk_to_rs(sk);
 67 
 68         sock_orphan(sk);
 69         /* Note - rds_clear_recv_queue grabs rs_recv_lock, so
 70          * that ensures the recv path has completed messing
 71          * with the socket. */
 72         rds_clear_recv_queue(rs);
 73         rds_cong_remove_socket(rs);
 74 
 75         rds_remove_bound(rs);
 76 
 77         rds_send_drop_to(rs, NULL);
 78         rds_rdma_drop_keys(rs);
 79         rds_notify_queue_get(rs, NULL);
 80 
 81         spin_lock_bh(&rds_sock_lock);
 82         list_del_init(&rs->rs_item);
 83         rds_sock_count--;
 84         spin_unlock_bh(&rds_sock_lock);
 85 
 86         rds_trans_put(rs->rs_transport);
 87 
 88         sock->sk = NULL;
 89         sock_put(sk);
 90 out:
 91         return 0;
 92 }
 93 
 94 /*
 95  * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
 96  * _bh() isn't OK here, we're called from interrupt handlers.  It's probably OK
 97  * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
 98  * this seems more conservative.
 99  * NB - normally, one would use sk_callback_lock for this, but we can
100  * get here from interrupts, whereas the network code grabs sk_callback_lock
101  * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
102  */
103 void rds_wake_sk_sleep(struct rds_sock *rs)
104 {
105         unsigned long flags;
106 
107         read_lock_irqsave(&rs->rs_recv_lock, flags);
108         __rds_wake_sk_sleep(rds_rs_to_sk(rs));
109         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
110 }
111 
112 static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
113                        int *uaddr_len, int peer)
114 {
115         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
116         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
117 
118         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
119 
120         /* racey, don't care */
121         if (peer) {
122                 if (!rs->rs_conn_addr)
123                         return -ENOTCONN;
124 
125                 sin->sin_port = rs->rs_conn_port;
126                 sin->sin_addr.s_addr = rs->rs_conn_addr;
127         } else {
128                 sin->sin_port = rs->rs_bound_port;
129                 sin->sin_addr.s_addr = rs->rs_bound_addr;
130         }
131 
132         sin->sin_family = AF_INET;
133 
134         *uaddr_len = sizeof(*sin);
135         return 0;
136 }
137 
138 /*
139  * RDS' poll is without a doubt the least intuitive part of the interface,
140  * as POLLIN and POLLOUT do not behave entirely as you would expect from
141  * a network protocol.
142  *
143  * POLLIN is asserted if
144  *  -   there is data on the receive queue.
145  *  -   to signal that a previously congested destination may have become
146  *      uncongested
147  *  -   A notification has been queued to the socket (this can be a congestion
148  *      update, or a RDMA completion).
149  *
150  * POLLOUT is asserted if there is room on the send queue. This does not mean
151  * however, that the next sendmsg() call will succeed. If the application tries
152  * to send to a congested destination, the system call may still fail (and
153  * return ENOBUFS).
154  */
155 static unsigned int rds_poll(struct file *file, struct socket *sock,
156                              poll_table *wait)
157 {
158         struct sock *sk = sock->sk;
159         struct rds_sock *rs = rds_sk_to_rs(sk);
160         unsigned int mask = 0;
161         unsigned long flags;
162 
163         poll_wait(file, sk_sleep(sk), wait);
164 
165         if (rs->rs_seen_congestion)
166                 poll_wait(file, &rds_poll_waitq, wait);
167 
168         read_lock_irqsave(&rs->rs_recv_lock, flags);
169         if (!rs->rs_cong_monitor) {
170                 /* When a congestion map was updated, we signal POLLIN for
171                  * "historical" reasons. Applications can also poll for
172                  * WRBAND instead. */
173                 if (rds_cong_updated_since(&rs->rs_cong_track))
174                         mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
175         } else {
176                 spin_lock(&rs->rs_lock);
177                 if (rs->rs_cong_notify)
178                         mask |= (POLLIN | POLLRDNORM);
179                 spin_unlock(&rs->rs_lock);
180         }
181         if (!list_empty(&rs->rs_recv_queue) ||
182             !list_empty(&rs->rs_notify_queue))
183                 mask |= (POLLIN | POLLRDNORM);
184         if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
185                 mask |= (POLLOUT | POLLWRNORM);
186         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
187 
188         /* clear state any time we wake a seen-congested socket */
189         if (mask)
190                 rs->rs_seen_congestion = 0;
191 
192         return mask;
193 }
194 
195 static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
196 {
197         return -ENOIOCTLCMD;
198 }
199 
200 static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
201                               int len)
202 {
203         struct sockaddr_in sin;
204         int ret = 0;
205 
206         /* racing with another thread binding seems ok here */
207         if (rs->rs_bound_addr == 0) {
208                 ret = -ENOTCONN; /* XXX not a great errno */
209                 goto out;
210         }
211 
212         if (len < sizeof(struct sockaddr_in)) {
213                 ret = -EINVAL;
214                 goto out;
215         }
216 
217         if (copy_from_user(&sin, optval, sizeof(sin))) {
218                 ret = -EFAULT;
219                 goto out;
220         }
221 
222         rds_send_drop_to(rs, &sin);
223 out:
224         return ret;
225 }
226 
227 static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
228                                int optlen)
229 {
230         int value;
231 
232         if (optlen < sizeof(int))
233                 return -EINVAL;
234         if (get_user(value, (int __user *) optval))
235                 return -EFAULT;
236         *optvar = !!value;
237         return 0;
238 }
239 
240 static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
241                             int optlen)
242 {
243         int ret;
244 
245         ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
246         if (ret == 0) {
247                 if (rs->rs_cong_monitor) {
248                         rds_cong_add_socket(rs);
249                 } else {
250                         rds_cong_remove_socket(rs);
251                         rs->rs_cong_mask = 0;
252                         rs->rs_cong_notify = 0;
253                 }
254         }
255         return ret;
256 }
257 
258 static int rds_set_transport(struct rds_sock *rs, char __user *optval,
259                              int optlen)
260 {
261         int t_type;
262 
263         if (rs->rs_transport)
264                 return -EOPNOTSUPP; /* previously attached to transport */
265 
266         if (optlen != sizeof(int))
267                 return -EINVAL;
268 
269         if (copy_from_user(&t_type, (int __user *)optval, sizeof(t_type)))
270                 return -EFAULT;
271 
272         if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
273                 return -EINVAL;
274 
275         rs->rs_transport = rds_trans_get(t_type);
276 
277         return rs->rs_transport ? 0 : -ENOPROTOOPT;
278 }
279 
280 static int rds_enable_recvtstamp(struct sock *sk, char __user *optval,
281                                  int optlen)
282 {
283         int val, valbool;
284 
285         if (optlen != sizeof(int))
286                 return -EFAULT;
287 
288         if (get_user(val, (int __user *)optval))
289                 return -EFAULT;
290 
291         valbool = val ? 1 : 0;
292 
293         if (valbool)
294                 sock_set_flag(sk, SOCK_RCVTSTAMP);
295         else
296                 sock_reset_flag(sk, SOCK_RCVTSTAMP);
297 
298         return 0;
299 }
300 
301 static int rds_recv_track_latency(struct rds_sock *rs, char __user *optval,
302                                   int optlen)
303 {
304         struct rds_rx_trace_so trace;
305         int i;
306 
307         if (optlen != sizeof(struct rds_rx_trace_so))
308                 return -EFAULT;
309 
310         if (copy_from_user(&trace, optval, sizeof(trace)))
311                 return -EFAULT;
312 
313         if (trace.rx_traces > RDS_MSG_RX_DGRAM_TRACE_MAX)
314                 return -EFAULT;
315 
316         rs->rs_rx_traces = trace.rx_traces;
317         for (i = 0; i < rs->rs_rx_traces; i++) {
318                 if (trace.rx_trace_pos[i] > RDS_MSG_RX_DGRAM_TRACE_MAX) {
319                         rs->rs_rx_traces = 0;
320                         return -EFAULT;
321                 }
322                 rs->rs_rx_trace[i] = trace.rx_trace_pos[i];
323         }
324 
325         return 0;
326 }
327 
328 static int rds_setsockopt(struct socket *sock, int level, int optname,
329                           char __user *optval, unsigned int optlen)
330 {
331         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
332         int ret;
333 
334         if (level != SOL_RDS) {
335                 ret = -ENOPROTOOPT;
336                 goto out;
337         }
338 
339         switch (optname) {
340         case RDS_CANCEL_SENT_TO:
341                 ret = rds_cancel_sent_to(rs, optval, optlen);
342                 break;
343         case RDS_GET_MR:
344                 ret = rds_get_mr(rs, optval, optlen);
345                 break;
346         case RDS_GET_MR_FOR_DEST:
347                 ret = rds_get_mr_for_dest(rs, optval, optlen);
348                 break;
349         case RDS_FREE_MR:
350                 ret = rds_free_mr(rs, optval, optlen);
351                 break;
352         case RDS_RECVERR:
353                 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
354                 break;
355         case RDS_CONG_MONITOR:
356                 ret = rds_cong_monitor(rs, optval, optlen);
357                 break;
358         case SO_RDS_TRANSPORT:
359                 lock_sock(sock->sk);
360                 ret = rds_set_transport(rs, optval, optlen);
361                 release_sock(sock->sk);
362                 break;
363         case SO_TIMESTAMP:
364                 lock_sock(sock->sk);
365                 ret = rds_enable_recvtstamp(sock->sk, optval, optlen);
366                 release_sock(sock->sk);
367                 break;
368         case SO_RDS_MSG_RXPATH_LATENCY:
369                 ret = rds_recv_track_latency(rs, optval, optlen);
370                 break;
371         default:
372                 ret = -ENOPROTOOPT;
373         }
374 out:
375         return ret;
376 }
377 
378 static int rds_getsockopt(struct socket *sock, int level, int optname,
379                           char __user *optval, int __user *optlen)
380 {
381         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
382         int ret = -ENOPROTOOPT, len;
383         int trans;
384 
385         if (level != SOL_RDS)
386                 goto out;
387 
388         if (get_user(len, optlen)) {
389                 ret = -EFAULT;
390                 goto out;
391         }
392 
393         switch (optname) {
394         case RDS_INFO_FIRST ... RDS_INFO_LAST:
395                 ret = rds_info_getsockopt(sock, optname, optval,
396                                           optlen);
397                 break;
398 
399         case RDS_RECVERR:
400                 if (len < sizeof(int))
401                         ret = -EINVAL;
402                 else
403                 if (put_user(rs->rs_recverr, (int __user *) optval) ||
404                     put_user(sizeof(int), optlen))
405                         ret = -EFAULT;
406                 else
407                         ret = 0;
408                 break;
409         case SO_RDS_TRANSPORT:
410                 if (len < sizeof(int)) {
411                         ret = -EINVAL;
412                         break;
413                 }
414                 trans = (rs->rs_transport ? rs->rs_transport->t_type :
415                          RDS_TRANS_NONE); /* unbound */
416                 if (put_user(trans, (int __user *)optval) ||
417                     put_user(sizeof(int), optlen))
418                         ret = -EFAULT;
419                 else
420                         ret = 0;
421                 break;
422         default:
423                 break;
424         }
425 
426 out:
427         return ret;
428 
429 }
430 
431 static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
432                        int addr_len, int flags)
433 {
434         struct sock *sk = sock->sk;
435         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
436         struct rds_sock *rs = rds_sk_to_rs(sk);
437         int ret = 0;
438 
439         lock_sock(sk);
440 
441         if (addr_len != sizeof(struct sockaddr_in)) {
442                 ret = -EINVAL;
443                 goto out;
444         }
445 
446         if (sin->sin_family != AF_INET) {
447                 ret = -EAFNOSUPPORT;
448                 goto out;
449         }
450 
451         if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
452                 ret = -EDESTADDRREQ;
453                 goto out;
454         }
455 
456         rs->rs_conn_addr = sin->sin_addr.s_addr;
457         rs->rs_conn_port = sin->sin_port;
458 
459 out:
460         release_sock(sk);
461         return ret;
462 }
463 
464 static struct proto rds_proto = {
465         .name     = "RDS",
466         .owner    = THIS_MODULE,
467         .obj_size = sizeof(struct rds_sock),
468 };
469 
470 static const struct proto_ops rds_proto_ops = {
471         .family =       AF_RDS,
472         .owner =        THIS_MODULE,
473         .release =      rds_release,
474         .bind =         rds_bind,
475         .connect =      rds_connect,
476         .socketpair =   sock_no_socketpair,
477         .accept =       sock_no_accept,
478         .getname =      rds_getname,
479         .poll =         rds_poll,
480         .ioctl =        rds_ioctl,
481         .listen =       sock_no_listen,
482         .shutdown =     sock_no_shutdown,
483         .setsockopt =   rds_setsockopt,
484         .getsockopt =   rds_getsockopt,
485         .sendmsg =      rds_sendmsg,
486         .recvmsg =      rds_recvmsg,
487         .mmap =         sock_no_mmap,
488         .sendpage =     sock_no_sendpage,
489 };
490 
491 static void rds_sock_destruct(struct sock *sk)
492 {
493         struct rds_sock *rs = rds_sk_to_rs(sk);
494 
495         WARN_ON((&rs->rs_item != rs->rs_item.next ||
496                  &rs->rs_item != rs->rs_item.prev));
497 }
498 
499 static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
500 {
501         struct rds_sock *rs;
502 
503         sock_init_data(sock, sk);
504         sock->ops               = &rds_proto_ops;
505         sk->sk_protocol         = protocol;
506         sk->sk_destruct         = rds_sock_destruct;
507 
508         rs = rds_sk_to_rs(sk);
509         spin_lock_init(&rs->rs_lock);
510         rwlock_init(&rs->rs_recv_lock);
511         INIT_LIST_HEAD(&rs->rs_send_queue);
512         INIT_LIST_HEAD(&rs->rs_recv_queue);
513         INIT_LIST_HEAD(&rs->rs_notify_queue);
514         INIT_LIST_HEAD(&rs->rs_cong_list);
515         spin_lock_init(&rs->rs_rdma_lock);
516         rs->rs_rdma_keys = RB_ROOT;
517         rs->rs_rx_traces = 0;
518 
519         spin_lock_bh(&rds_sock_lock);
520         list_add_tail(&rs->rs_item, &rds_sock_list);
521         rds_sock_count++;
522         spin_unlock_bh(&rds_sock_lock);
523 
524         return 0;
525 }
526 
527 static int rds_create(struct net *net, struct socket *sock, int protocol,
528                       int kern)
529 {
530         struct sock *sk;
531 
532         if (sock->type != SOCK_SEQPACKET || protocol)
533                 return -ESOCKTNOSUPPORT;
534 
535         sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto, kern);
536         if (!sk)
537                 return -ENOMEM;
538 
539         return __rds_create(sock, sk, protocol);
540 }
541 
542 void rds_sock_addref(struct rds_sock *rs)
543 {
544         sock_hold(rds_rs_to_sk(rs));
545 }
546 
547 void rds_sock_put(struct rds_sock *rs)
548 {
549         sock_put(rds_rs_to_sk(rs));
550 }
551 
552 static const struct net_proto_family rds_family_ops = {
553         .family =       AF_RDS,
554         .create =       rds_create,
555         .owner  =       THIS_MODULE,
556 };
557 
558 static void rds_sock_inc_info(struct socket *sock, unsigned int len,
559                               struct rds_info_iterator *iter,
560                               struct rds_info_lengths *lens)
561 {
562         struct rds_sock *rs;
563         struct rds_incoming *inc;
564         unsigned int total = 0;
565 
566         len /= sizeof(struct rds_info_message);
567 
568         spin_lock_bh(&rds_sock_lock);
569 
570         list_for_each_entry(rs, &rds_sock_list, rs_item) {
571                 read_lock(&rs->rs_recv_lock);
572 
573                 /* XXX too lazy to maintain counts.. */
574                 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
575                         total++;
576                         if (total <= len)
577                                 rds_inc_info_copy(inc, iter, inc->i_saddr,
578                                                   rs->rs_bound_addr, 1);
579                 }
580 
581                 read_unlock(&rs->rs_recv_lock);
582         }
583 
584         spin_unlock_bh(&rds_sock_lock);
585 
586         lens->nr = total;
587         lens->each = sizeof(struct rds_info_message);
588 }
589 
590 static void rds_sock_info(struct socket *sock, unsigned int len,
591                           struct rds_info_iterator *iter,
592                           struct rds_info_lengths *lens)
593 {
594         struct rds_info_socket sinfo;
595         struct rds_sock *rs;
596 
597         len /= sizeof(struct rds_info_socket);
598 
599         spin_lock_bh(&rds_sock_lock);
600 
601         if (len < rds_sock_count)
602                 goto out;
603 
604         list_for_each_entry(rs, &rds_sock_list, rs_item) {
605                 sinfo.sndbuf = rds_sk_sndbuf(rs);
606                 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
607                 sinfo.bound_addr = rs->rs_bound_addr;
608                 sinfo.connected_addr = rs->rs_conn_addr;
609                 sinfo.bound_port = rs->rs_bound_port;
610                 sinfo.connected_port = rs->rs_conn_port;
611                 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
612 
613                 rds_info_copy(iter, &sinfo, sizeof(sinfo));
614         }
615 
616 out:
617         lens->nr = rds_sock_count;
618         lens->each = sizeof(struct rds_info_socket);
619 
620         spin_unlock_bh(&rds_sock_lock);
621 }
622 
623 static void rds_exit(void)
624 {
625         sock_unregister(rds_family_ops.family);
626         proto_unregister(&rds_proto);
627         rds_conn_exit();
628         rds_cong_exit();
629         rds_sysctl_exit();
630         rds_threads_exit();
631         rds_stats_exit();
632         rds_page_exit();
633         rds_bind_lock_destroy();
634         rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
635         rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
636 }
637 module_exit(rds_exit);
638 
639 u32 rds_gen_num;
640 
641 static int rds_init(void)
642 {
643         int ret;
644 
645         net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
646 
647         ret = rds_bind_lock_init();
648         if (ret)
649                 goto out;
650 
651         ret = rds_conn_init();
652         if (ret)
653                 goto out_bind;
654 
655         ret = rds_threads_init();
656         if (ret)
657                 goto out_conn;
658         ret = rds_sysctl_init();
659         if (ret)
660                 goto out_threads;
661         ret = rds_stats_init();
662         if (ret)
663                 goto out_sysctl;
664         ret = proto_register(&rds_proto, 1);
665         if (ret)
666                 goto out_stats;
667         ret = sock_register(&rds_family_ops);
668         if (ret)
669                 goto out_proto;
670 
671         rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
672         rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
673 
674         goto out;
675 
676 out_proto:
677         proto_unregister(&rds_proto);
678 out_stats:
679         rds_stats_exit();
680 out_sysctl:
681         rds_sysctl_exit();
682 out_threads:
683         rds_threads_exit();
684 out_conn:
685         rds_conn_exit();
686         rds_cong_exit();
687         rds_page_exit();
688 out_bind:
689         rds_bind_lock_destroy();
690 out:
691         return ret;
692 }
693 module_init(rds_init);
694 
695 #define DRV_VERSION     "4.0"
696 #define DRV_RELDATE     "Feb 12, 2009"
697 
698 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
699 MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
700                    " v" DRV_VERSION " (" DRV_RELDATE ")");
701 MODULE_VERSION(DRV_VERSION);
702 MODULE_LICENSE("Dual BSD/GPL");
703 MODULE_ALIAS_NETPROTO(PF_RDS);
704 

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