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1/*
2 * Copyright (c) 2006, 2019 Oracle and/or its affiliates. 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/ipv6.h>
39#include <linux/poll.h>
40#include <net/sock.h>
41
42#include "rds.h"
43
44/* this is just used for stats gathering :/ */
45static DEFINE_SPINLOCK(rds_sock_lock);
46static unsigned long rds_sock_count;
47static LIST_HEAD(rds_sock_list);
48DECLARE_WAIT_QUEUE_HEAD(rds_poll_waitq);
49
50/*
51 * This is called as the final descriptor referencing this socket is closed.
52 * We have to unbind the socket so that another socket can be bound to the
53 * address it was using.
54 *
55 * We have to be careful about racing with the incoming path. sock_orphan()
56 * sets SOCK_DEAD and we use that as an indicator to the rx path that new
57 * messages shouldn't be queued.
58 */
59static int rds_release(struct socket *sock)
60{
61 struct sock *sk = sock->sk;
62 struct rds_sock *rs;
63
64 if (!sk)
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
76 rds_remove_bound(rs);
77
78 rds_send_drop_to(rs, NULL);
79 rds_rdma_drop_keys(rs);
80 rds_notify_queue_get(rs, NULL);
81 rds_notify_msg_zcopy_purge(&rs->rs_zcookie_queue);
82
83 spin_lock_bh(&rds_sock_lock);
84 list_del_init(&rs->rs_item);
85 rds_sock_count--;
86 spin_unlock_bh(&rds_sock_lock);
87
88 rds_trans_put(rs->rs_transport);
89
90 sock->sk = NULL;
91 sock_put(sk);
92out:
93 return 0;
94}
95
96/*
97 * Careful not to race with rds_release -> sock_orphan which clears sk_sleep.
98 * _bh() isn't OK here, we're called from interrupt handlers. It's probably OK
99 * to wake the waitqueue after sk_sleep is clear as we hold a sock ref, but
100 * this seems more conservative.
101 * NB - normally, one would use sk_callback_lock for this, but we can
102 * get here from interrupts, whereas the network code grabs sk_callback_lock
103 * with _lock_bh only - so relying on sk_callback_lock introduces livelocks.
104 */
105void rds_wake_sk_sleep(struct rds_sock *rs)
106{
107 unsigned long flags;
108
109 read_lock_irqsave(&rs->rs_recv_lock, flags);
110 __rds_wake_sk_sleep(rds_rs_to_sk(rs));
111 read_unlock_irqrestore(&rs->rs_recv_lock, flags);
112}
113
114static int rds_getname(struct socket *sock, struct sockaddr *uaddr,
115 int peer)
116{
117 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
118 struct sockaddr_in6 *sin6;
119 struct sockaddr_in *sin;
120 int uaddr_len;
121
122 /* racey, don't care */
123 if (peer) {
124 if (ipv6_addr_any(&rs->rs_conn_addr))
125 return -ENOTCONN;
126
127 if (ipv6_addr_v4mapped(&rs->rs_conn_addr)) {
128 sin = (struct sockaddr_in *)uaddr;
129 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
130 sin->sin_family = AF_INET;
131 sin->sin_port = rs->rs_conn_port;
132 sin->sin_addr.s_addr = rs->rs_conn_addr_v4;
133 uaddr_len = sizeof(*sin);
134 } else {
135 sin6 = (struct sockaddr_in6 *)uaddr;
136 sin6->sin6_family = AF_INET6;
137 sin6->sin6_port = rs->rs_conn_port;
138 sin6->sin6_addr = rs->rs_conn_addr;
139 sin6->sin6_flowinfo = 0;
140 /* scope_id is the same as in the bound address. */
141 sin6->sin6_scope_id = rs->rs_bound_scope_id;
142 uaddr_len = sizeof(*sin6);
143 }
144 } else {
145 /* If socket is not yet bound and the socket is connected,
146 * set the return address family to be the same as the
147 * connected address, but with 0 address value. If it is not
148 * connected, set the family to be AF_UNSPEC (value 0) and
149 * the address size to be that of an IPv4 address.
150 */
151 if (ipv6_addr_any(&rs->rs_bound_addr)) {
152 if (ipv6_addr_any(&rs->rs_conn_addr)) {
153 sin = (struct sockaddr_in *)uaddr;
154 memset(sin, 0, sizeof(*sin));
155 sin->sin_family = AF_UNSPEC;
156 return sizeof(*sin);
157 }
158
159#if IS_ENABLED(CONFIG_IPV6)
160 if (!(ipv6_addr_type(&rs->rs_conn_addr) &
161 IPV6_ADDR_MAPPED)) {
162 sin6 = (struct sockaddr_in6 *)uaddr;
163 memset(sin6, 0, sizeof(*sin6));
164 sin6->sin6_family = AF_INET6;
165 return sizeof(*sin6);
166 }
167#endif
168
169 sin = (struct sockaddr_in *)uaddr;
170 memset(sin, 0, sizeof(*sin));
171 sin->sin_family = AF_INET;
172 return sizeof(*sin);
173 }
174 if (ipv6_addr_v4mapped(&rs->rs_bound_addr)) {
175 sin = (struct sockaddr_in *)uaddr;
176 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
177 sin->sin_family = AF_INET;
178 sin->sin_port = rs->rs_bound_port;
179 sin->sin_addr.s_addr = rs->rs_bound_addr_v4;
180 uaddr_len = sizeof(*sin);
181 } else {
182 sin6 = (struct sockaddr_in6 *)uaddr;
183 sin6->sin6_family = AF_INET6;
184 sin6->sin6_port = rs->rs_bound_port;
185 sin6->sin6_addr = rs->rs_bound_addr;
186 sin6->sin6_flowinfo = 0;
187 sin6->sin6_scope_id = rs->rs_bound_scope_id;
188 uaddr_len = sizeof(*sin6);
189 }
190 }
191
192 return uaddr_len;
193}
194
195/*
196 * RDS' poll is without a doubt the least intuitive part of the interface,
197 * as EPOLLIN and EPOLLOUT do not behave entirely as you would expect from
198 * a network protocol.
199 *
200 * EPOLLIN is asserted if
201 * - there is data on the receive queue.
202 * - to signal that a previously congested destination may have become
203 * uncongested
204 * - A notification has been queued to the socket (this can be a congestion
205 * update, or a RDMA completion, or a MSG_ZEROCOPY completion).
206 *
207 * EPOLLOUT is asserted if there is room on the send queue. This does not mean
208 * however, that the next sendmsg() call will succeed. If the application tries
209 * to send to a congested destination, the system call may still fail (and
210 * return ENOBUFS).
211 */
212static __poll_t rds_poll(struct file *file, struct socket *sock,
213 poll_table *wait)
214{
215 struct sock *sk = sock->sk;
216 struct rds_sock *rs = rds_sk_to_rs(sk);
217 __poll_t mask = 0;
218 unsigned long flags;
219
220 poll_wait(file, sk_sleep(sk), wait);
221
222 if (rs->rs_seen_congestion)
223 poll_wait(file, &rds_poll_waitq, wait);
224
225 read_lock_irqsave(&rs->rs_recv_lock, flags);
226 if (!rs->rs_cong_monitor) {
227 /* When a congestion map was updated, we signal EPOLLIN for
228 * "historical" reasons. Applications can also poll for
229 * WRBAND instead. */
230 if (rds_cong_updated_since(&rs->rs_cong_track))
231 mask |= (EPOLLIN | EPOLLRDNORM | EPOLLWRBAND);
232 } else {
233 spin_lock(&rs->rs_lock);
234 if (rs->rs_cong_notify)
235 mask |= (EPOLLIN | EPOLLRDNORM);
236 spin_unlock(&rs->rs_lock);
237 }
238 if (!list_empty(&rs->rs_recv_queue) ||
239 !list_empty(&rs->rs_notify_queue) ||
240 !list_empty(&rs->rs_zcookie_queue.zcookie_head))
241 mask |= (EPOLLIN | EPOLLRDNORM);
242 if (rs->rs_snd_bytes < rds_sk_sndbuf(rs))
243 mask |= (EPOLLOUT | EPOLLWRNORM);
244 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
245 mask |= POLLERR;
246 read_unlock_irqrestore(&rs->rs_recv_lock, flags);
247
248 /* clear state any time we wake a seen-congested socket */
249 if (mask)
250 rs->rs_seen_congestion = 0;
251
252 return mask;
253}
254
255static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
256{
257 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
258 rds_tos_t utos, tos = 0;
259
260 switch (cmd) {
261 case SIOCRDSSETTOS:
262 if (get_user(utos, (rds_tos_t __user *)arg))
263 return -EFAULT;
264
265 if (rs->rs_transport &&
266 rs->rs_transport->get_tos_map)
267 tos = rs->rs_transport->get_tos_map(utos);
268 else
269 return -ENOIOCTLCMD;
270
271 spin_lock_bh(&rds_sock_lock);
272 if (rs->rs_tos || rs->rs_conn) {
273 spin_unlock_bh(&rds_sock_lock);
274 return -EINVAL;
275 }
276 rs->rs_tos = tos;
277 spin_unlock_bh(&rds_sock_lock);
278 break;
279 case SIOCRDSGETTOS:
280 spin_lock_bh(&rds_sock_lock);
281 tos = rs->rs_tos;
282 spin_unlock_bh(&rds_sock_lock);
283 if (put_user(tos, (rds_tos_t __user *)arg))
284 return -EFAULT;
285 break;
286 default:
287 return -ENOIOCTLCMD;
288 }
289
290 return 0;
291}
292
293static int rds_cancel_sent_to(struct rds_sock *rs, sockptr_t optval, int len)
294{
295 struct sockaddr_in6 sin6;
296 struct sockaddr_in sin;
297 int ret = 0;
298
299 /* racing with another thread binding seems ok here */
300 if (ipv6_addr_any(&rs->rs_bound_addr)) {
301 ret = -ENOTCONN; /* XXX not a great errno */
302 goto out;
303 }
304
305 if (len < sizeof(struct sockaddr_in)) {
306 ret = -EINVAL;
307 goto out;
308 } else if (len < sizeof(struct sockaddr_in6)) {
309 /* Assume IPv4 */
310 if (copy_from_sockptr(&sin, optval,
311 sizeof(struct sockaddr_in))) {
312 ret = -EFAULT;
313 goto out;
314 }
315 ipv6_addr_set_v4mapped(sin.sin_addr.s_addr, &sin6.sin6_addr);
316 sin6.sin6_port = sin.sin_port;
317 } else {
318 if (copy_from_sockptr(&sin6, optval,
319 sizeof(struct sockaddr_in6))) {
320 ret = -EFAULT;
321 goto out;
322 }
323 }
324
325 rds_send_drop_to(rs, &sin6);
326out:
327 return ret;
328}
329
330static int rds_set_bool_option(unsigned char *optvar, sockptr_t optval,
331 int optlen)
332{
333 int value;
334
335 if (optlen < sizeof(int))
336 return -EINVAL;
337 if (copy_from_sockptr(&value, optval, sizeof(int)))
338 return -EFAULT;
339 *optvar = !!value;
340 return 0;
341}
342
343static int rds_cong_monitor(struct rds_sock *rs, sockptr_t optval, int optlen)
344{
345 int ret;
346
347 ret = rds_set_bool_option(&rs->rs_cong_monitor, optval, optlen);
348 if (ret == 0) {
349 if (rs->rs_cong_monitor) {
350 rds_cong_add_socket(rs);
351 } else {
352 rds_cong_remove_socket(rs);
353 rs->rs_cong_mask = 0;
354 rs->rs_cong_notify = 0;
355 }
356 }
357 return ret;
358}
359
360static int rds_set_transport(struct rds_sock *rs, sockptr_t optval, int optlen)
361{
362 int t_type;
363
364 if (rs->rs_transport)
365 return -EOPNOTSUPP; /* previously attached to transport */
366
367 if (optlen != sizeof(int))
368 return -EINVAL;
369
370 if (copy_from_sockptr(&t_type, optval, sizeof(t_type)))
371 return -EFAULT;
372
373 if (t_type < 0 || t_type >= RDS_TRANS_COUNT)
374 return -EINVAL;
375
376 rs->rs_transport = rds_trans_get(t_type);
377
378 return rs->rs_transport ? 0 : -ENOPROTOOPT;
379}
380
381static int rds_enable_recvtstamp(struct sock *sk, sockptr_t optval,
382 int optlen, int optname)
383{
384 int val, valbool;
385
386 if (optlen != sizeof(int))
387 return -EFAULT;
388
389 if (copy_from_sockptr(&val, optval, sizeof(int)))
390 return -EFAULT;
391
392 valbool = val ? 1 : 0;
393
394 if (optname == SO_TIMESTAMP_NEW)
395 sock_set_flag(sk, SOCK_TSTAMP_NEW);
396
397 if (valbool)
398 sock_set_flag(sk, SOCK_RCVTSTAMP);
399 else
400 sock_reset_flag(sk, SOCK_RCVTSTAMP);
401
402 return 0;
403}
404
405static int rds_recv_track_latency(struct rds_sock *rs, sockptr_t optval,
406 int optlen)
407{
408 struct rds_rx_trace_so trace;
409 int i;
410
411 if (optlen != sizeof(struct rds_rx_trace_so))
412 return -EFAULT;
413
414 if (copy_from_sockptr(&trace, optval, sizeof(trace)))
415 return -EFAULT;
416
417 if (trace.rx_traces > RDS_MSG_RX_DGRAM_TRACE_MAX)
418 return -EFAULT;
419
420 rs->rs_rx_traces = trace.rx_traces;
421 for (i = 0; i < rs->rs_rx_traces; i++) {
422 if (trace.rx_trace_pos[i] > RDS_MSG_RX_DGRAM_TRACE_MAX) {
423 rs->rs_rx_traces = 0;
424 return -EFAULT;
425 }
426 rs->rs_rx_trace[i] = trace.rx_trace_pos[i];
427 }
428
429 return 0;
430}
431
432static int rds_setsockopt(struct socket *sock, int level, int optname,
433 sockptr_t optval, unsigned int optlen)
434{
435 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
436 int ret;
437
438 if (level != SOL_RDS) {
439 ret = -ENOPROTOOPT;
440 goto out;
441 }
442
443 switch (optname) {
444 case RDS_CANCEL_SENT_TO:
445 ret = rds_cancel_sent_to(rs, optval, optlen);
446 break;
447 case RDS_GET_MR:
448 ret = rds_get_mr(rs, optval, optlen);
449 break;
450 case RDS_GET_MR_FOR_DEST:
451 ret = rds_get_mr_for_dest(rs, optval, optlen);
452 break;
453 case RDS_FREE_MR:
454 ret = rds_free_mr(rs, optval, optlen);
455 break;
456 case RDS_RECVERR:
457 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
458 break;
459 case RDS_CONG_MONITOR:
460 ret = rds_cong_monitor(rs, optval, optlen);
461 break;
462 case SO_RDS_TRANSPORT:
463 lock_sock(sock->sk);
464 ret = rds_set_transport(rs, optval, optlen);
465 release_sock(sock->sk);
466 break;
467 case SO_TIMESTAMP_OLD:
468 case SO_TIMESTAMP_NEW:
469 lock_sock(sock->sk);
470 ret = rds_enable_recvtstamp(sock->sk, optval, optlen, optname);
471 release_sock(sock->sk);
472 break;
473 case SO_RDS_MSG_RXPATH_LATENCY:
474 ret = rds_recv_track_latency(rs, optval, optlen);
475 break;
476 default:
477 ret = -ENOPROTOOPT;
478 }
479out:
480 return ret;
481}
482
483static int rds_getsockopt(struct socket *sock, int level, int optname,
484 char __user *optval, int __user *optlen)
485{
486 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
487 int ret = -ENOPROTOOPT, len;
488 int trans;
489
490 if (level != SOL_RDS)
491 goto out;
492
493 if (get_user(len, optlen)) {
494 ret = -EFAULT;
495 goto out;
496 }
497
498 switch (optname) {
499 case RDS_INFO_FIRST ... RDS_INFO_LAST:
500 ret = rds_info_getsockopt(sock, optname, optval,
501 optlen);
502 break;
503
504 case RDS_RECVERR:
505 if (len < sizeof(int))
506 ret = -EINVAL;
507 else
508 if (put_user(rs->rs_recverr, (int __user *) optval) ||
509 put_user(sizeof(int), optlen))
510 ret = -EFAULT;
511 else
512 ret = 0;
513 break;
514 case SO_RDS_TRANSPORT:
515 if (len < sizeof(int)) {
516 ret = -EINVAL;
517 break;
518 }
519 trans = (rs->rs_transport ? rs->rs_transport->t_type :
520 RDS_TRANS_NONE); /* unbound */
521 if (put_user(trans, (int __user *)optval) ||
522 put_user(sizeof(int), optlen))
523 ret = -EFAULT;
524 else
525 ret = 0;
526 break;
527 default:
528 break;
529 }
530
531out:
532 return ret;
533
534}
535
536static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
537 int addr_len, int flags)
538{
539 struct sock *sk = sock->sk;
540 struct sockaddr_in *sin;
541 struct rds_sock *rs = rds_sk_to_rs(sk);
542 int ret = 0;
543
544 if (addr_len < offsetofend(struct sockaddr, sa_family))
545 return -EINVAL;
546
547 lock_sock(sk);
548
549 switch (uaddr->sa_family) {
550 case AF_INET:
551 sin = (struct sockaddr_in *)uaddr;
552 if (addr_len < sizeof(struct sockaddr_in)) {
553 ret = -EINVAL;
554 break;
555 }
556 if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
557 ret = -EDESTADDRREQ;
558 break;
559 }
560 if (ipv4_is_multicast(sin->sin_addr.s_addr) ||
561 sin->sin_addr.s_addr == htonl(INADDR_BROADCAST)) {
562 ret = -EINVAL;
563 break;
564 }
565 ipv6_addr_set_v4mapped(sin->sin_addr.s_addr, &rs->rs_conn_addr);
566 rs->rs_conn_port = sin->sin_port;
567 break;
568
569#if IS_ENABLED(CONFIG_IPV6)
570 case AF_INET6: {
571 struct sockaddr_in6 *sin6;
572 int addr_type;
573
574 sin6 = (struct sockaddr_in6 *)uaddr;
575 if (addr_len < sizeof(struct sockaddr_in6)) {
576 ret = -EINVAL;
577 break;
578 }
579 addr_type = ipv6_addr_type(&sin6->sin6_addr);
580 if (!(addr_type & IPV6_ADDR_UNICAST)) {
581 __be32 addr4;
582
583 if (!(addr_type & IPV6_ADDR_MAPPED)) {
584 ret = -EPROTOTYPE;
585 break;
586 }
587
588 /* It is a mapped address. Need to do some sanity
589 * checks.
590 */
591 addr4 = sin6->sin6_addr.s6_addr32[3];
592 if (addr4 == htonl(INADDR_ANY) ||
593 addr4 == htonl(INADDR_BROADCAST) ||
594 ipv4_is_multicast(addr4)) {
595 ret = -EPROTOTYPE;
596 break;
597 }
598 }
599
600 if (addr_type & IPV6_ADDR_LINKLOCAL) {
601 /* If socket is arleady bound to a link local address,
602 * the peer address must be on the same link.
603 */
604 if (sin6->sin6_scope_id == 0 ||
605 (!ipv6_addr_any(&rs->rs_bound_addr) &&
606 rs->rs_bound_scope_id &&
607 sin6->sin6_scope_id != rs->rs_bound_scope_id)) {
608 ret = -EINVAL;
609 break;
610 }
611 /* Remember the connected address scope ID. It will
612 * be checked against the binding local address when
613 * the socket is bound.
614 */
615 rs->rs_bound_scope_id = sin6->sin6_scope_id;
616 }
617 rs->rs_conn_addr = sin6->sin6_addr;
618 rs->rs_conn_port = sin6->sin6_port;
619 break;
620 }
621#endif
622
623 default:
624 ret = -EAFNOSUPPORT;
625 break;
626 }
627
628 release_sock(sk);
629 return ret;
630}
631
632static struct proto rds_proto = {
633 .name = "RDS",
634 .owner = THIS_MODULE,
635 .obj_size = sizeof(struct rds_sock),
636};
637
638static const struct proto_ops rds_proto_ops = {
639 .family = AF_RDS,
640 .owner = THIS_MODULE,
641 .release = rds_release,
642 .bind = rds_bind,
643 .connect = rds_connect,
644 .socketpair = sock_no_socketpair,
645 .accept = sock_no_accept,
646 .getname = rds_getname,
647 .poll = rds_poll,
648 .ioctl = rds_ioctl,
649 .listen = sock_no_listen,
650 .shutdown = sock_no_shutdown,
651 .setsockopt = rds_setsockopt,
652 .getsockopt = rds_getsockopt,
653 .sendmsg = rds_sendmsg,
654 .recvmsg = rds_recvmsg,
655 .mmap = sock_no_mmap,
656 .sendpage = sock_no_sendpage,
657};
658
659static void rds_sock_destruct(struct sock *sk)
660{
661 struct rds_sock *rs = rds_sk_to_rs(sk);
662
663 WARN_ON((&rs->rs_item != rs->rs_item.next ||
664 &rs->rs_item != rs->rs_item.prev));
665}
666
667static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
668{
669 struct rds_sock *rs;
670
671 sock_init_data(sock, sk);
672 sock->ops = &rds_proto_ops;
673 sk->sk_protocol = protocol;
674 sk->sk_destruct = rds_sock_destruct;
675
676 rs = rds_sk_to_rs(sk);
677 spin_lock_init(&rs->rs_lock);
678 rwlock_init(&rs->rs_recv_lock);
679 INIT_LIST_HEAD(&rs->rs_send_queue);
680 INIT_LIST_HEAD(&rs->rs_recv_queue);
681 INIT_LIST_HEAD(&rs->rs_notify_queue);
682 INIT_LIST_HEAD(&rs->rs_cong_list);
683 rds_message_zcopy_queue_init(&rs->rs_zcookie_queue);
684 spin_lock_init(&rs->rs_rdma_lock);
685 rs->rs_rdma_keys = RB_ROOT;
686 rs->rs_rx_traces = 0;
687 rs->rs_tos = 0;
688 rs->rs_conn = NULL;
689
690 spin_lock_bh(&rds_sock_lock);
691 list_add_tail(&rs->rs_item, &rds_sock_list);
692 rds_sock_count++;
693 spin_unlock_bh(&rds_sock_lock);
694
695 return 0;
696}
697
698static int rds_create(struct net *net, struct socket *sock, int protocol,
699 int kern)
700{
701 struct sock *sk;
702
703 if (sock->type != SOCK_SEQPACKET || protocol)
704 return -ESOCKTNOSUPPORT;
705
706 sk = sk_alloc(net, AF_RDS, GFP_KERNEL, &rds_proto, kern);
707 if (!sk)
708 return -ENOMEM;
709
710 return __rds_create(sock, sk, protocol);
711}
712
713void rds_sock_addref(struct rds_sock *rs)
714{
715 sock_hold(rds_rs_to_sk(rs));
716}
717
718void rds_sock_put(struct rds_sock *rs)
719{
720 sock_put(rds_rs_to_sk(rs));
721}
722
723static const struct net_proto_family rds_family_ops = {
724 .family = AF_RDS,
725 .create = rds_create,
726 .owner = THIS_MODULE,
727};
728
729static void rds_sock_inc_info(struct socket *sock, unsigned int len,
730 struct rds_info_iterator *iter,
731 struct rds_info_lengths *lens)
732{
733 struct rds_sock *rs;
734 struct rds_incoming *inc;
735 unsigned int total = 0;
736
737 len /= sizeof(struct rds_info_message);
738
739 spin_lock_bh(&rds_sock_lock);
740
741 list_for_each_entry(rs, &rds_sock_list, rs_item) {
742 /* This option only supports IPv4 sockets. */
743 if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
744 continue;
745
746 read_lock(&rs->rs_recv_lock);
747
748 /* XXX too lazy to maintain counts.. */
749 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
750 total++;
751 if (total <= len)
752 rds_inc_info_copy(inc, iter,
753 inc->i_saddr.s6_addr32[3],
754 rs->rs_bound_addr_v4,
755 1);
756 }
757
758 read_unlock(&rs->rs_recv_lock);
759 }
760
761 spin_unlock_bh(&rds_sock_lock);
762
763 lens->nr = total;
764 lens->each = sizeof(struct rds_info_message);
765}
766
767#if IS_ENABLED(CONFIG_IPV6)
768static void rds6_sock_inc_info(struct socket *sock, unsigned int len,
769 struct rds_info_iterator *iter,
770 struct rds_info_lengths *lens)
771{
772 struct rds_incoming *inc;
773 unsigned int total = 0;
774 struct rds_sock *rs;
775
776 len /= sizeof(struct rds6_info_message);
777
778 spin_lock_bh(&rds_sock_lock);
779
780 list_for_each_entry(rs, &rds_sock_list, rs_item) {
781 read_lock(&rs->rs_recv_lock);
782
783 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
784 total++;
785 if (total <= len)
786 rds6_inc_info_copy(inc, iter, &inc->i_saddr,
787 &rs->rs_bound_addr, 1);
788 }
789
790 read_unlock(&rs->rs_recv_lock);
791 }
792
793 spin_unlock_bh(&rds_sock_lock);
794
795 lens->nr = total;
796 lens->each = sizeof(struct rds6_info_message);
797}
798#endif
799
800static void rds_sock_info(struct socket *sock, unsigned int len,
801 struct rds_info_iterator *iter,
802 struct rds_info_lengths *lens)
803{
804 struct rds_info_socket sinfo;
805 unsigned int cnt = 0;
806 struct rds_sock *rs;
807
808 len /= sizeof(struct rds_info_socket);
809
810 spin_lock_bh(&rds_sock_lock);
811
812 if (len < rds_sock_count) {
813 cnt = rds_sock_count;
814 goto out;
815 }
816
817 list_for_each_entry(rs, &rds_sock_list, rs_item) {
818 /* This option only supports IPv4 sockets. */
819 if (!ipv6_addr_v4mapped(&rs->rs_bound_addr))
820 continue;
821 sinfo.sndbuf = rds_sk_sndbuf(rs);
822 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
823 sinfo.bound_addr = rs->rs_bound_addr_v4;
824 sinfo.connected_addr = rs->rs_conn_addr_v4;
825 sinfo.bound_port = rs->rs_bound_port;
826 sinfo.connected_port = rs->rs_conn_port;
827 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
828
829 rds_info_copy(iter, &sinfo, sizeof(sinfo));
830 cnt++;
831 }
832
833out:
834 lens->nr = cnt;
835 lens->each = sizeof(struct rds_info_socket);
836
837 spin_unlock_bh(&rds_sock_lock);
838}
839
840#if IS_ENABLED(CONFIG_IPV6)
841static void rds6_sock_info(struct socket *sock, unsigned int len,
842 struct rds_info_iterator *iter,
843 struct rds_info_lengths *lens)
844{
845 struct rds6_info_socket sinfo6;
846 struct rds_sock *rs;
847
848 len /= sizeof(struct rds6_info_socket);
849
850 spin_lock_bh(&rds_sock_lock);
851
852 if (len < rds_sock_count)
853 goto out;
854
855 list_for_each_entry(rs, &rds_sock_list, rs_item) {
856 sinfo6.sndbuf = rds_sk_sndbuf(rs);
857 sinfo6.rcvbuf = rds_sk_rcvbuf(rs);
858 sinfo6.bound_addr = rs->rs_bound_addr;
859 sinfo6.connected_addr = rs->rs_conn_addr;
860 sinfo6.bound_port = rs->rs_bound_port;
861 sinfo6.connected_port = rs->rs_conn_port;
862 sinfo6.inum = sock_i_ino(rds_rs_to_sk(rs));
863
864 rds_info_copy(iter, &sinfo6, sizeof(sinfo6));
865 }
866
867 out:
868 lens->nr = rds_sock_count;
869 lens->each = sizeof(struct rds6_info_socket);
870
871 spin_unlock_bh(&rds_sock_lock);
872}
873#endif
874
875static void rds_exit(void)
876{
877 sock_unregister(rds_family_ops.family);
878 proto_unregister(&rds_proto);
879 rds_conn_exit();
880 rds_cong_exit();
881 rds_sysctl_exit();
882 rds_threads_exit();
883 rds_stats_exit();
884 rds_page_exit();
885 rds_bind_lock_destroy();
886 rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
887 rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
888#if IS_ENABLED(CONFIG_IPV6)
889 rds_info_deregister_func(RDS6_INFO_SOCKETS, rds6_sock_info);
890 rds_info_deregister_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
891#endif
892}
893module_exit(rds_exit);
894
895u32 rds_gen_num;
896
897static int rds_init(void)
898{
899 int ret;
900
901 net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
902
903 ret = rds_bind_lock_init();
904 if (ret)
905 goto out;
906
907 ret = rds_conn_init();
908 if (ret)
909 goto out_bind;
910
911 ret = rds_threads_init();
912 if (ret)
913 goto out_conn;
914 ret = rds_sysctl_init();
915 if (ret)
916 goto out_threads;
917 ret = rds_stats_init();
918 if (ret)
919 goto out_sysctl;
920 ret = proto_register(&rds_proto, 1);
921 if (ret)
922 goto out_stats;
923 ret = sock_register(&rds_family_ops);
924 if (ret)
925 goto out_proto;
926
927 rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
928 rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
929#if IS_ENABLED(CONFIG_IPV6)
930 rds_info_register_func(RDS6_INFO_SOCKETS, rds6_sock_info);
931 rds_info_register_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
932#endif
933
934 goto out;
935
936out_proto:
937 proto_unregister(&rds_proto);
938out_stats:
939 rds_stats_exit();
940out_sysctl:
941 rds_sysctl_exit();
942out_threads:
943 rds_threads_exit();
944out_conn:
945 rds_conn_exit();
946 rds_cong_exit();
947 rds_page_exit();
948out_bind:
949 rds_bind_lock_destroy();
950out:
951 return ret;
952}
953module_init(rds_init);
954
955#define DRV_VERSION "4.0"
956#define DRV_RELDATE "Feb 12, 2009"
957
958MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
959MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
960 " v" DRV_VERSION " (" DRV_RELDATE ")");
961MODULE_VERSION(DRV_VERSION);
962MODULE_LICENSE("Dual BSD/GPL");
963MODULE_ALIAS_NETPROTO(PF_RDS);
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 :/ */
44static DEFINE_SPINLOCK(rds_sock_lock);
45static unsigned long rds_sock_count;
46static LIST_HEAD(rds_sock_list);
47DECLARE_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 */
58static 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);
90out:
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 */
103void 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
112static 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 */
155static 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
195static int rds_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
196{
197 return -ENOIOCTLCMD;
198}
199
200static 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);
223out:
224 return ret;
225}
226
227static 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
240static 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
258static 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
280static 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
301static int rds_setsockopt(struct socket *sock, int level, int optname,
302 char __user *optval, unsigned int optlen)
303{
304 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
305 int ret;
306
307 if (level != SOL_RDS) {
308 ret = -ENOPROTOOPT;
309 goto out;
310 }
311
312 switch (optname) {
313 case RDS_CANCEL_SENT_TO:
314 ret = rds_cancel_sent_to(rs, optval, optlen);
315 break;
316 case RDS_GET_MR:
317 ret = rds_get_mr(rs, optval, optlen);
318 break;
319 case RDS_GET_MR_FOR_DEST:
320 ret = rds_get_mr_for_dest(rs, optval, optlen);
321 break;
322 case RDS_FREE_MR:
323 ret = rds_free_mr(rs, optval, optlen);
324 break;
325 case RDS_RECVERR:
326 ret = rds_set_bool_option(&rs->rs_recverr, optval, optlen);
327 break;
328 case RDS_CONG_MONITOR:
329 ret = rds_cong_monitor(rs, optval, optlen);
330 break;
331 case SO_RDS_TRANSPORT:
332 lock_sock(sock->sk);
333 ret = rds_set_transport(rs, optval, optlen);
334 release_sock(sock->sk);
335 break;
336 case SO_TIMESTAMP:
337 lock_sock(sock->sk);
338 ret = rds_enable_recvtstamp(sock->sk, optval, optlen);
339 release_sock(sock->sk);
340 break;
341 default:
342 ret = -ENOPROTOOPT;
343 }
344out:
345 return ret;
346}
347
348static int rds_getsockopt(struct socket *sock, int level, int optname,
349 char __user *optval, int __user *optlen)
350{
351 struct rds_sock *rs = rds_sk_to_rs(sock->sk);
352 int ret = -ENOPROTOOPT, len;
353 int trans;
354
355 if (level != SOL_RDS)
356 goto out;
357
358 if (get_user(len, optlen)) {
359 ret = -EFAULT;
360 goto out;
361 }
362
363 switch (optname) {
364 case RDS_INFO_FIRST ... RDS_INFO_LAST:
365 ret = rds_info_getsockopt(sock, optname, optval,
366 optlen);
367 break;
368
369 case RDS_RECVERR:
370 if (len < sizeof(int))
371 ret = -EINVAL;
372 else
373 if (put_user(rs->rs_recverr, (int __user *) optval) ||
374 put_user(sizeof(int), optlen))
375 ret = -EFAULT;
376 else
377 ret = 0;
378 break;
379 case SO_RDS_TRANSPORT:
380 if (len < sizeof(int)) {
381 ret = -EINVAL;
382 break;
383 }
384 trans = (rs->rs_transport ? rs->rs_transport->t_type :
385 RDS_TRANS_NONE); /* unbound */
386 if (put_user(trans, (int __user *)optval) ||
387 put_user(sizeof(int), optlen))
388 ret = -EFAULT;
389 else
390 ret = 0;
391 break;
392 default:
393 break;
394 }
395
396out:
397 return ret;
398
399}
400
401static int rds_connect(struct socket *sock, struct sockaddr *uaddr,
402 int addr_len, int flags)
403{
404 struct sock *sk = sock->sk;
405 struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;
406 struct rds_sock *rs = rds_sk_to_rs(sk);
407 int ret = 0;
408
409 lock_sock(sk);
410
411 if (addr_len != sizeof(struct sockaddr_in)) {
412 ret = -EINVAL;
413 goto out;
414 }
415
416 if (sin->sin_family != AF_INET) {
417 ret = -EAFNOSUPPORT;
418 goto out;
419 }
420
421 if (sin->sin_addr.s_addr == htonl(INADDR_ANY)) {
422 ret = -EDESTADDRREQ;
423 goto out;
424 }
425
426 rs->rs_conn_addr = sin->sin_addr.s_addr;
427 rs->rs_conn_port = sin->sin_port;
428
429out:
430 release_sock(sk);
431 return ret;
432}
433
434static struct proto rds_proto = {
435 .name = "RDS",
436 .owner = THIS_MODULE,
437 .obj_size = sizeof(struct rds_sock),
438};
439
440static const struct proto_ops rds_proto_ops = {
441 .family = AF_RDS,
442 .owner = THIS_MODULE,
443 .release = rds_release,
444 .bind = rds_bind,
445 .connect = rds_connect,
446 .socketpair = sock_no_socketpair,
447 .accept = sock_no_accept,
448 .getname = rds_getname,
449 .poll = rds_poll,
450 .ioctl = rds_ioctl,
451 .listen = sock_no_listen,
452 .shutdown = sock_no_shutdown,
453 .setsockopt = rds_setsockopt,
454 .getsockopt = rds_getsockopt,
455 .sendmsg = rds_sendmsg,
456 .recvmsg = rds_recvmsg,
457 .mmap = sock_no_mmap,
458 .sendpage = sock_no_sendpage,
459};
460
461static void rds_sock_destruct(struct sock *sk)
462{
463 struct rds_sock *rs = rds_sk_to_rs(sk);
464
465 WARN_ON((&rs->rs_item != rs->rs_item.next ||
466 &rs->rs_item != rs->rs_item.prev));
467}
468
469static int __rds_create(struct socket *sock, struct sock *sk, int protocol)
470{
471 struct rds_sock *rs;
472
473 sock_init_data(sock, sk);
474 sock->ops = &rds_proto_ops;
475 sk->sk_protocol = protocol;
476 sk->sk_destruct = rds_sock_destruct;
477
478 rs = rds_sk_to_rs(sk);
479 spin_lock_init(&rs->rs_lock);
480 rwlock_init(&rs->rs_recv_lock);
481 INIT_LIST_HEAD(&rs->rs_send_queue);
482 INIT_LIST_HEAD(&rs->rs_recv_queue);
483 INIT_LIST_HEAD(&rs->rs_notify_queue);
484 INIT_LIST_HEAD(&rs->rs_cong_list);
485 spin_lock_init(&rs->rs_rdma_lock);
486 rs->rs_rdma_keys = RB_ROOT;
487
488 spin_lock_bh(&rds_sock_lock);
489 list_add_tail(&rs->rs_item, &rds_sock_list);
490 rds_sock_count++;
491 spin_unlock_bh(&rds_sock_lock);
492
493 return 0;
494}
495
496static int rds_create(struct net *net, struct socket *sock, int protocol,
497 int kern)
498{
499 struct sock *sk;
500
501 if (sock->type != SOCK_SEQPACKET || protocol)
502 return -ESOCKTNOSUPPORT;
503
504 sk = sk_alloc(net, AF_RDS, GFP_ATOMIC, &rds_proto, kern);
505 if (!sk)
506 return -ENOMEM;
507
508 return __rds_create(sock, sk, protocol);
509}
510
511void rds_sock_addref(struct rds_sock *rs)
512{
513 sock_hold(rds_rs_to_sk(rs));
514}
515
516void rds_sock_put(struct rds_sock *rs)
517{
518 sock_put(rds_rs_to_sk(rs));
519}
520
521static const struct net_proto_family rds_family_ops = {
522 .family = AF_RDS,
523 .create = rds_create,
524 .owner = THIS_MODULE,
525};
526
527static void rds_sock_inc_info(struct socket *sock, unsigned int len,
528 struct rds_info_iterator *iter,
529 struct rds_info_lengths *lens)
530{
531 struct rds_sock *rs;
532 struct rds_incoming *inc;
533 unsigned int total = 0;
534
535 len /= sizeof(struct rds_info_message);
536
537 spin_lock_bh(&rds_sock_lock);
538
539 list_for_each_entry(rs, &rds_sock_list, rs_item) {
540 read_lock(&rs->rs_recv_lock);
541
542 /* XXX too lazy to maintain counts.. */
543 list_for_each_entry(inc, &rs->rs_recv_queue, i_item) {
544 total++;
545 if (total <= len)
546 rds_inc_info_copy(inc, iter, inc->i_saddr,
547 rs->rs_bound_addr, 1);
548 }
549
550 read_unlock(&rs->rs_recv_lock);
551 }
552
553 spin_unlock_bh(&rds_sock_lock);
554
555 lens->nr = total;
556 lens->each = sizeof(struct rds_info_message);
557}
558
559static void rds_sock_info(struct socket *sock, unsigned int len,
560 struct rds_info_iterator *iter,
561 struct rds_info_lengths *lens)
562{
563 struct rds_info_socket sinfo;
564 struct rds_sock *rs;
565
566 len /= sizeof(struct rds_info_socket);
567
568 spin_lock_bh(&rds_sock_lock);
569
570 if (len < rds_sock_count)
571 goto out;
572
573 list_for_each_entry(rs, &rds_sock_list, rs_item) {
574 sinfo.sndbuf = rds_sk_sndbuf(rs);
575 sinfo.rcvbuf = rds_sk_rcvbuf(rs);
576 sinfo.bound_addr = rs->rs_bound_addr;
577 sinfo.connected_addr = rs->rs_conn_addr;
578 sinfo.bound_port = rs->rs_bound_port;
579 sinfo.connected_port = rs->rs_conn_port;
580 sinfo.inum = sock_i_ino(rds_rs_to_sk(rs));
581
582 rds_info_copy(iter, &sinfo, sizeof(sinfo));
583 }
584
585out:
586 lens->nr = rds_sock_count;
587 lens->each = sizeof(struct rds_info_socket);
588
589 spin_unlock_bh(&rds_sock_lock);
590}
591
592static void rds_exit(void)
593{
594 sock_unregister(rds_family_ops.family);
595 proto_unregister(&rds_proto);
596 rds_conn_exit();
597 rds_cong_exit();
598 rds_sysctl_exit();
599 rds_threads_exit();
600 rds_stats_exit();
601 rds_page_exit();
602 rds_bind_lock_destroy();
603 rds_info_deregister_func(RDS_INFO_SOCKETS, rds_sock_info);
604 rds_info_deregister_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
605}
606module_exit(rds_exit);
607
608u32 rds_gen_num;
609
610static int rds_init(void)
611{
612 int ret;
613
614 net_get_random_once(&rds_gen_num, sizeof(rds_gen_num));
615
616 ret = rds_bind_lock_init();
617 if (ret)
618 goto out;
619
620 ret = rds_conn_init();
621 if (ret)
622 goto out_bind;
623
624 ret = rds_threads_init();
625 if (ret)
626 goto out_conn;
627 ret = rds_sysctl_init();
628 if (ret)
629 goto out_threads;
630 ret = rds_stats_init();
631 if (ret)
632 goto out_sysctl;
633 ret = proto_register(&rds_proto, 1);
634 if (ret)
635 goto out_stats;
636 ret = sock_register(&rds_family_ops);
637 if (ret)
638 goto out_proto;
639
640 rds_info_register_func(RDS_INFO_SOCKETS, rds_sock_info);
641 rds_info_register_func(RDS_INFO_RECV_MESSAGES, rds_sock_inc_info);
642
643 goto out;
644
645out_proto:
646 proto_unregister(&rds_proto);
647out_stats:
648 rds_stats_exit();
649out_sysctl:
650 rds_sysctl_exit();
651out_threads:
652 rds_threads_exit();
653out_conn:
654 rds_conn_exit();
655 rds_cong_exit();
656 rds_page_exit();
657out_bind:
658 rds_bind_lock_destroy();
659out:
660 return ret;
661}
662module_init(rds_init);
663
664#define DRV_VERSION "4.0"
665#define DRV_RELDATE "Feb 12, 2009"
666
667MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>");
668MODULE_DESCRIPTION("RDS: Reliable Datagram Sockets"
669 " v" DRV_VERSION " (" DRV_RELDATE ")");
670MODULE_VERSION(DRV_VERSION);
671MODULE_LICENSE("Dual BSD/GPL");
672MODULE_ALIAS_NETPROTO(PF_RDS);