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

Version: ~ [ linux-5.2-rc1 ] ~ [ linux-5.1.2 ] ~ [ linux-5.0.16 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.43 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.119 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.176 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.179 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.139 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.67 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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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 char *rds_str_array(char **array, size_t elements, size_t index)
 44 {
 45         if ((index < elements) && array[index])
 46                 return array[index];
 47         else
 48                 return "unknown";
 49 }
 50 EXPORT_SYMBOL(rds_str_array);
 51 
 52 /* this is just used for stats gathering :/ */
 53 static DEFINE_SPINLOCK(rds_sock_lock);
 54 static unsigned long rds_sock_count;
 55 static LIST_HEAD(rds_sock_list);
 56 DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
 57 
 58 /*
 59  * This is called as the final descriptor referencing this socket is closed.
 60  * We have to unbind the socket so that another socket can be bound to the
 61  * address it was using.
 62  *
 63  * We have to be careful about racing with the incoming path.  sock_orphan()
 64  * sets SOCK_DEAD and we use that as an indicator to the rx path that new
 65  * messages shouldn't be queued.
 66  */
 67 static int rds_release(struct socket *sock)
 68 {
 69         struct sock *sk = sock->sk;
 70         struct rds_sock *rs;
 71 
 72         if (!sk)
 73                 goto out;
 74 
 75         rs = rds_sk_to_rs(sk);
 76 
 77         sock_orphan(sk);
 78         /* Note - rds_clear_recv_queue grabs rs_recv_lock, so
 79          * that ensures the recv path has completed messing
 80          * with the socket. */
 81         rds_clear_recv_queue(rs);
 82         rds_cong_remove_socket(rs);
 83 
 84         /*
 85          * the binding lookup hash uses rcu, we need to
 86          * make sure we sychronize_rcu before we free our
 87          * entry
 88          */
 89         rds_remove_bound(rs);
 90         synchronize_rcu();
 91 
 92         rds_send_drop_to(rs, NULL);
 93         rds_rdma_drop_keys(rs);
 94         rds_notify_queue_get(rs, NULL);
 95 
 96         spin_lock_bh(&rds_sock_lock);
 97         list_del_init(&rs->rs_item);
 98         rds_sock_count--;
 99         spin_unlock_bh(&rds_sock_lock);
100 
101         rds_trans_put(rs->rs_transport);
102 
103         sock->sk = NULL;
104         sock_put(sk);
105 out:
106         return 0;
107 }
108 
109 /*
110  * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
111  * _bh() isn't OK here, we're called from interrupt handlers.  It's probably OK
112  * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
113  * this seems more conservative.
114  * NB - normally, one would use sk_callback_lock for this, but we can
115  * get here from interrupts, whereas the network code grabs sk_callback_lock
116  * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
117  */
118 void rds_wake_sk_sleep(struct rds_sock *rs)
119 {
120         unsigned long flags;
121 
122         read_lock_irqsave(&rs->rs_recv_lock, flags);
123         __rds_wake_sk_sleep(rds_rs_to_sk(rs));
124         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
125 }
126 
127 static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
128                        int *uaddr_len, int peer)
129 {
130         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
131         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
132 
133         memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
134 
135         /* racey, don't care */
136         if (peer) {
137                 if (!rs->rs_conn_addr)
138                         return -ENOTCONN;
139 
140                 sin->sin_port = rs->rs_conn_port;
141                 sin->sin_addr.s_addr = rs->rs_conn_addr;
142         } else {
143                 sin->sin_port = rs->rs_bound_port;
144                 sin->sin_addr.s_addr = rs->rs_bound_addr;
145         }
146 
147         sin->sin_family = AF_INET;
148 
149         *uaddr_len = sizeof(*sin);
150         return 0;
151 }
152 
153 /*
154  * RDS' poll is without a doubt the least intuitive part of the interface,
155  * as POLLIN and POLLOUT do not behave entirely as you would expect from
156  * a network protocol.
157  *
158  * POLLIN is asserted if
159  *  -   there is data on the receive queue.
160  *  -   to signal that a previously congested destination may have become
161  *      uncongested
162  *  -   A notification has been queued to the socket (this can be a congestion
163  *      update, or a RDMA completion).
164  *
165  * POLLOUT is asserted if there is room on the send queue. This does not mean
166  * however, that the next sendmsg() call will succeed. If the application tries
167  * to send to a congested destination, the system call may still fail (and
168  * return ENOBUFS).
169  */
170 static unsigned int rds_poll(struct file *file, struct socket *sock,
171                              poll_table *wait)
172 {
173         struct sock *sk = sock->sk;
174         struct rds_sock *rs = rds_sk_to_rs(sk);
175         unsigned int mask = 0;
176         unsigned long flags;
177 
178         poll_wait(file, sk_sleep(sk), wait);
179 
180         if (rs->rs_seen_congestion)
181                 poll_wait(file, &rds_poll_waitq, wait);
182 
183         read_lock_irqsave(&rs->rs_recv_lock, flags);
184         if (!rs->rs_cong_monitor) {
185                 /* When a congestion map was updated, we signal POLLIN for
186                  * "historical" reasons. Applications can also poll for
187                  * WRBAND instead. */
188                 if (rds_cong_updated_since(&rs->rs_cong_track))
189                         mask |= (POLLIN | POLLRDNORM | POLLWRBAND);
190         } else {
191                 spin_lock(&rs->rs_lock);
192                 if (rs->rs_cong_notify)
193                         mask |= (POLLIN | POLLRDNORM);
194                 spin_unlock(&rs->rs_lock);
195         }
196         if (!list_empty(&rs->rs_recv_queue) ||
197             !list_empty(&rs->rs_notify_queue))
198                 mask |= (POLLIN | POLLRDNORM);
199         if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
200                 mask |= (POLLOUT | POLLWRNORM);
201         read_unlock_irqrestore(&rs->rs_recv_lock, flags);
202 
203         /* clear state any time we wake a seen-congested socket */
204         if (mask)
205                 rs->rs_seen_congestion = 0;
206 
207         return mask;
208 }
209 
210 static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
211 {
212         return -ENOIOCTLCMD;
213 }
214 
215 static int rds_cancel_sent_to(struct rds_sock *rs, char __user *optval,
216                               int len)
217 {
218         struct sockaddr_in sin;
219         int ret = 0;
220 
221         /* racing with another thread binding seems ok here */
222         if (rs->rs_bound_addr == 0) {
223                 ret = -ENOTCONN; /* XXX not a great errno */
224                 goto out;
225         }
226 
227         if (len < sizeof(struct sockaddr_in)) {
228                 ret = -EINVAL;
229                 goto out;
230         }
231 
232         if (copy_from_user(&sin, optval, sizeof(sin))) {
233                 ret = -EFAULT;
234                 goto out;
235         }
236 
237         rds_send_drop_to(rs, &sin);
238 out:
239         return ret;
240 }
241 
242 static int rds_set_bool_option(unsigned char *optvar, char __user *optval,
243                                int optlen)
244 {
245         int value;
246 
247         if (optlen < sizeof(int))
248                 return -EINVAL;
249         if (get_user(value, (int __user *) optval))
250                 return -EFAULT;
251         *optvar = !!value;
252         return 0;
253 }
254 
255 static int rds_cong_monitor(struct rds_sock *rs, char __user *optval,
256                             int optlen)
257 {
258         int ret;
259 
260         ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
261         if (ret == 0) {
262                 if (rs->rs_cong_monitor) {
263                         rds_cong_add_socket(rs);
264                 } else {
265                         rds_cong_remove_socket(rs);
266                         rs->rs_cong_mask = 0;
267                         rs->rs_cong_notify = 0;
268                 }
269         }
270         return ret;
271 }
272 
273 static int rds_setsockopt(struct socket *sock, int level, int optname,
274                           char __user *optval, unsigned int optlen)
275 {
276         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
277         int ret;
278 
279         if (level != SOL_RDS) {
280                 ret = -ENOPROTOOPT;
281                 goto out;
282         }
283 
284         switch (optname) {
285         case RDS_CANCEL_SENT_TO:
286                 ret = rds_cancel_sent_to(rs, optval, optlen);
287                 break;
288         case RDS_GET_MR:
289                 ret = rds_get_mr(rs, optval, optlen);
290                 break;
291         case RDS_GET_MR_FOR_DEST:
292                 ret = rds_get_mr_for_dest(rs, optval, optlen);
293                 break;
294         case RDS_FREE_MR:
295                 ret = rds_free_mr(rs, optval, optlen);
296                 break;
297         case RDS_RECVERR:
298                 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
299                 break;
300         case RDS_CONG_MONITOR:
301                 ret = rds_cong_monitor(rs, optval, optlen);
302                 break;
303         default:
304                 ret = -ENOPROTOOPT;
305         }
306 out:
307         return ret;
308 }
309 
310 static int rds_getsockopt(struct socket *sock, int level, int optname,
311                           char __user *optval, int __user *optlen)
312 {
313         struct rds_sock *rs = rds_sk_to_rs(sock->sk);
314         int ret = -ENOPROTOOPT, len;
315 
316         if (level != SOL_RDS)
317                 goto out;
318 
319         if (get_user(len, optlen)) {
320                 ret = -EFAULT;
321                 goto out;
322         }
323 
324         switch (optname) {
325         case RDS_INFO_FIRST ... RDS_INFO_LAST:
326                 ret = rds_info_getsockopt(sock, optname, optval,
327                                           optlen);
328                 break;
329 
330         case RDS_RECVERR:
331                 if (len < sizeof(int))
332                         ret = -EINVAL;
333                 else
334                 if (put_user(rs->rs_recverr, (int __user *) optval) ||
335                     put_user(sizeof(int), optlen))
336                         ret = -EFAULT;
337                 else
338                         ret = 0;
339                 break;
340         default:
341                 break;
342         }
343 
344 out:
345         return ret;
346 
347 }
348 
349 static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
350                        int addr_len, int flags)
351 {
352         struct sock *sk = sock->sk;
353         struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
354         struct rds_sock *rs = rds_sk_to_rs(sk);
355         int ret = 0;
356 
357         lock_sock(sk);
358 
359         if (addr_len != sizeof(struct sockaddr_in)) {
360                 ret = -EINVAL;
361                 goto out;
362         }
363 
364         if (sin->sin_family != AF_INET) {
365                 ret = -EAFNOSUPPORT;
366                 goto out;
367         }
368 
369         if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
370                 ret = -EDESTADDRREQ;
371                 goto out;
372         }
373 
374         rs->rs_conn_addr = sin->sin_addr.s_addr;
375         rs->rs_conn_port = sin->sin_port;
376 
377 out:
378         release_sock(sk);
379         return ret;
380 }
381 
382 static struct proto rds_proto = {
383         .name     = "RDS",
384         .owner    = THIS_MODULE,
385         .obj_size = sizeof(struct rds_sock),
386 };
387 
388 static const struct proto_ops rds_proto_ops = {
389         .family =       AF_RDS,
390         .owner =        THIS_MODULE,
391         .release =      rds_release,
392         .bind =         rds_bind,
393         .connect =      rds_connect,
394         .socketpair =   sock_no_socketpair,
395         .accept =       sock_no_accept,
396         .getname =      rds_getname,
397         .poll =         rds_poll,
398         .ioctl =        rds_ioctl,
399         .listen =       sock_no_listen,
400         .shutdown =     sock_no_shutdown,
401         .setsockopt =   rds_setsockopt,
402         .getsockopt =   rds_getsockopt,
403         .sendmsg =      rds_sendmsg,
404         .recvmsg =      rds_recvmsg,
405         .mmap =         sock_no_mmap,
406         .sendpage =     sock_no_sendpage,
407 };
408 
409 static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
410 {
411         struct rds_sock *rs;
412 
413         sock_init_data(sock, sk);
414         sock->ops               = &rds_proto_ops;
415         sk->sk_protocol         = protocol;
416 
417         rs = rds_sk_to_rs(sk);
418         spin_lock_init(&rs->rs_lock);
419         rwlock_init(&rs->rs_recv_lock);
420         INIT_LIST_HEAD(&rs->rs_send_queue);
421         INIT_LIST_HEAD(&rs->rs_recv_queue);
422         INIT_LIST_HEAD(&rs->rs_notify_queue);
423         INIT_LIST_HEAD(&rs->rs_cong_list);
424         spin_lock_init(&rs->rs_rdma_lock);
425         rs->rs_rdma_keys = RB_ROOT;
426 
427         spin_lock_bh(&rds_sock_lock);
428         list_add_tail(&rs->rs_item, &rds_sock_list);
429         rds_sock_count++;
430         spin_unlock_bh(&rds_sock_lock);
431 
432         return 0;
433 }
434 
435 static int rds_create(struct net *net, struct socket *sock, int protocol,
436                       int kern)
437 {
438         struct sock *sk;
439 
440         if (sock->type != SOCK_SEQPACKET || protocol)
441                 return -ESOCKTNOSUPPORT;
442 
443         sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto);
444         if (!sk)
445                 return -ENOMEM;
446 
447         return __rds_create(sock, sk, protocol);
448 }
449 
450 void rds_sock_addref(struct rds_sock *rs)
451 {
452         sock_hold(rds_rs_to_sk(rs));
453 }
454 
455 void rds_sock_put(struct rds_sock *rs)
456 {
457         sock_put(rds_rs_to_sk(rs));
458 }
459 
460 static const struct net_proto_family rds_family_ops = {
461         .family =       AF_RDS,
462         .create =       rds_create,
463         .owner  =       THIS_MODULE,
464 };
465 
466 static void rds_sock_inc_info(struct socket *sock, unsigned int len,
467                               struct rds_info_iterator *iter,
468                               struct rds_info_lengths *lens)
469 {
470         struct rds_sock *rs;
471         struct rds_incoming *inc;
472         unsigned int total = 0;
473 
474         len /= sizeof(struct rds_info_message);
475 
476         spin_lock_bh(&rds_sock_lock);
477 
478         list_for_each_entry(rs, &rds_sock_list, rs_item) {
479                 read_lock(&rs->rs_recv_lock);
480 
481                 /* XXX too lazy to maintain counts.. */
482                 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
483                         total++;
484                         if (total <= len)
485                                 rds_inc_info_copy(inc, iter, inc->i_saddr,
486                                                   rs->rs_bound_addr, 1);
487                 }
488 
489                 read_unlock(&rs->rs_recv_lock);
490         }
491 
492         spin_unlock_bh(&rds_sock_lock);
493 
494         lens->nr = total;
495         lens->each = sizeof(struct rds_info_message);
496 }
497 
498 static void rds_sock_info(struct socket *sock, unsigned int len,
499                           struct rds_info_iterator *iter,
500                           struct rds_info_lengths *lens)
501 {
502         struct rds_info_socket sinfo;
503         struct rds_sock *rs;
504 
505         len /= sizeof(struct rds_info_socket);
506 
507         spin_lock_bh(&rds_sock_lock);
508 
509         if (len < rds_sock_count)
510                 goto out;
511 
512         list_for_each_entry(rs, &rds_sock_list, rs_item) {
513                 sinfo.sndbuf = rds_sk_sndbuf(rs);
514                 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
515                 sinfo.bound_addr = rs->rs_bound_addr;
516                 sinfo.connected_addr = rs->rs_conn_addr;
517                 sinfo.bound_port = rs->rs_bound_port;
518                 sinfo.connected_port = rs->rs_conn_port;
519                 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
520 
521                 rds_info_copy(iter, &sinfo, sizeof(sinfo));
522         }
523 
524 out:
525         lens->nr = rds_sock_count;
526         lens->each = sizeof(struct rds_info_socket);
527 
528         spin_unlock_bh(&rds_sock_lock);
529 }
530 
531 static void rds_exit(void)
532 {
533         sock_unregister(rds_family_ops.family);
534         proto_unregister(&rds_proto);
535         rds_conn_exit();
536         rds_cong_exit();
537         rds_sysctl_exit();
538         rds_threads_exit();
539         rds_stats_exit();
540         rds_page_exit();
541         rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
542         rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
543 }
544 module_exit(rds_exit);
545 
546 static int rds_init(void)
547 {
548         int ret;
549 
550         ret = rds_conn_init();
551         if (ret)
552                 goto out;
553         ret = rds_threads_init();
554         if (ret)
555                 goto out_conn;
556         ret = rds_sysctl_init();
557         if (ret)
558                 goto out_threads;
559         ret = rds_stats_init();
560         if (ret)
561                 goto out_sysctl;
562         ret = proto_register(&rds_proto, 1);
563         if (ret)
564                 goto out_stats;
565         ret = sock_register(&rds_family_ops);
566         if (ret)
567                 goto out_proto;
568 
569         rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
570         rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
571 
572         goto out;
573 
574 out_proto:
575         proto_unregister(&rds_proto);
576 out_stats:
577         rds_stats_exit();
578 out_sysctl:
579         rds_sysctl_exit();
580 out_threads:
581         rds_threads_exit();
582 out_conn:
583         rds_conn_exit();
584         rds_cong_exit();
585         rds_page_exit();
586 out:
587         return ret;
588 }
589 module_init(rds_init);
590 
591 #define DRV_VERSION     "4.0"
592 #define DRV_RELDATE     "Feb 12, 2009"
593 
594 MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
595 MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
596                    " v" DRV_VERSION " (" DRV_RELDATE ")");
597 MODULE_VERSION(DRV_VERSION);
598 MODULE_LICENSE("Dual BSD/GPL");
599 MODULE_ALIAS_NETPROTO(PF_RDS);
600 

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