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1/*
2 * Copyright (c) 2005-2006 Intel Corporation. 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/completion.h>
34#include <linux/file.h>
35#include <linux/mutex.h>
36#include <linux/poll.h>
37#include <linux/sched.h>
38#include <linux/idr.h>
39#include <linux/in.h>
40#include <linux/in6.h>
41#include <linux/miscdevice.h>
42#include <linux/slab.h>
43#include <linux/sysctl.h>
44
45#include <rdma/rdma_user_cm.h>
46#include <rdma/ib_marshall.h>
47#include <rdma/rdma_cm.h>
48#include <rdma/rdma_cm_ib.h>
49
50MODULE_AUTHOR("Sean Hefty");
51MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
52MODULE_LICENSE("Dual BSD/GPL");
53
54static unsigned int max_backlog = 1024;
55
56static struct ctl_table_header *ucma_ctl_table_hdr;
57static ctl_table ucma_ctl_table[] = {
58 {
59 .procname = "max_backlog",
60 .data = &max_backlog,
61 .maxlen = sizeof max_backlog,
62 .mode = 0644,
63 .proc_handler = proc_dointvec,
64 },
65 { }
66};
67
68static struct ctl_path ucma_ctl_path[] = {
69 { .procname = "net" },
70 { .procname = "rdma_ucm" },
71 { }
72};
73
74struct ucma_file {
75 struct mutex mut;
76 struct file *filp;
77 struct list_head ctx_list;
78 struct list_head event_list;
79 wait_queue_head_t poll_wait;
80};
81
82struct ucma_context {
83 int id;
84 struct completion comp;
85 atomic_t ref;
86 int events_reported;
87 int backlog;
88
89 struct ucma_file *file;
90 struct rdma_cm_id *cm_id;
91 u64 uid;
92
93 struct list_head list;
94 struct list_head mc_list;
95};
96
97struct ucma_multicast {
98 struct ucma_context *ctx;
99 int id;
100 int events_reported;
101
102 u64 uid;
103 struct list_head list;
104 struct sockaddr_storage addr;
105};
106
107struct ucma_event {
108 struct ucma_context *ctx;
109 struct ucma_multicast *mc;
110 struct list_head list;
111 struct rdma_cm_id *cm_id;
112 struct rdma_ucm_event_resp resp;
113};
114
115static DEFINE_MUTEX(mut);
116static DEFINE_IDR(ctx_idr);
117static DEFINE_IDR(multicast_idr);
118
119static inline struct ucma_context *_ucma_find_context(int id,
120 struct ucma_file *file)
121{
122 struct ucma_context *ctx;
123
124 ctx = idr_find(&ctx_idr, id);
125 if (!ctx)
126 ctx = ERR_PTR(-ENOENT);
127 else if (ctx->file != file)
128 ctx = ERR_PTR(-EINVAL);
129 return ctx;
130}
131
132static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
133{
134 struct ucma_context *ctx;
135
136 mutex_lock(&mut);
137 ctx = _ucma_find_context(id, file);
138 if (!IS_ERR(ctx))
139 atomic_inc(&ctx->ref);
140 mutex_unlock(&mut);
141 return ctx;
142}
143
144static void ucma_put_ctx(struct ucma_context *ctx)
145{
146 if (atomic_dec_and_test(&ctx->ref))
147 complete(&ctx->comp);
148}
149
150static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
151{
152 struct ucma_context *ctx;
153 int ret;
154
155 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
156 if (!ctx)
157 return NULL;
158
159 atomic_set(&ctx->ref, 1);
160 init_completion(&ctx->comp);
161 INIT_LIST_HEAD(&ctx->mc_list);
162 ctx->file = file;
163
164 do {
165 ret = idr_pre_get(&ctx_idr, GFP_KERNEL);
166 if (!ret)
167 goto error;
168
169 mutex_lock(&mut);
170 ret = idr_get_new(&ctx_idr, ctx, &ctx->id);
171 mutex_unlock(&mut);
172 } while (ret == -EAGAIN);
173
174 if (ret)
175 goto error;
176
177 list_add_tail(&ctx->list, &file->ctx_list);
178 return ctx;
179
180error:
181 kfree(ctx);
182 return NULL;
183}
184
185static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
186{
187 struct ucma_multicast *mc;
188 int ret;
189
190 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
191 if (!mc)
192 return NULL;
193
194 do {
195 ret = idr_pre_get(&multicast_idr, GFP_KERNEL);
196 if (!ret)
197 goto error;
198
199 mutex_lock(&mut);
200 ret = idr_get_new(&multicast_idr, mc, &mc->id);
201 mutex_unlock(&mut);
202 } while (ret == -EAGAIN);
203
204 if (ret)
205 goto error;
206
207 mc->ctx = ctx;
208 list_add_tail(&mc->list, &ctx->mc_list);
209 return mc;
210
211error:
212 kfree(mc);
213 return NULL;
214}
215
216static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
217 struct rdma_conn_param *src)
218{
219 if (src->private_data_len)
220 memcpy(dst->private_data, src->private_data,
221 src->private_data_len);
222 dst->private_data_len = src->private_data_len;
223 dst->responder_resources =src->responder_resources;
224 dst->initiator_depth = src->initiator_depth;
225 dst->flow_control = src->flow_control;
226 dst->retry_count = src->retry_count;
227 dst->rnr_retry_count = src->rnr_retry_count;
228 dst->srq = src->srq;
229 dst->qp_num = src->qp_num;
230}
231
232static void ucma_copy_ud_event(struct rdma_ucm_ud_param *dst,
233 struct rdma_ud_param *src)
234{
235 if (src->private_data_len)
236 memcpy(dst->private_data, src->private_data,
237 src->private_data_len);
238 dst->private_data_len = src->private_data_len;
239 ib_copy_ah_attr_to_user(&dst->ah_attr, &src->ah_attr);
240 dst->qp_num = src->qp_num;
241 dst->qkey = src->qkey;
242}
243
244static void ucma_set_event_context(struct ucma_context *ctx,
245 struct rdma_cm_event *event,
246 struct ucma_event *uevent)
247{
248 uevent->ctx = ctx;
249 switch (event->event) {
250 case RDMA_CM_EVENT_MULTICAST_JOIN:
251 case RDMA_CM_EVENT_MULTICAST_ERROR:
252 uevent->mc = (struct ucma_multicast *)
253 event->param.ud.private_data;
254 uevent->resp.uid = uevent->mc->uid;
255 uevent->resp.id = uevent->mc->id;
256 break;
257 default:
258 uevent->resp.uid = ctx->uid;
259 uevent->resp.id = ctx->id;
260 break;
261 }
262}
263
264static int ucma_event_handler(struct rdma_cm_id *cm_id,
265 struct rdma_cm_event *event)
266{
267 struct ucma_event *uevent;
268 struct ucma_context *ctx = cm_id->context;
269 int ret = 0;
270
271 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
272 if (!uevent)
273 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
274
275 uevent->cm_id = cm_id;
276 ucma_set_event_context(ctx, event, uevent);
277 uevent->resp.event = event->event;
278 uevent->resp.status = event->status;
279 if (cm_id->ps == RDMA_PS_UDP || cm_id->ps == RDMA_PS_IPOIB)
280 ucma_copy_ud_event(&uevent->resp.param.ud, &event->param.ud);
281 else
282 ucma_copy_conn_event(&uevent->resp.param.conn,
283 &event->param.conn);
284
285 mutex_lock(&ctx->file->mut);
286 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
287 if (!ctx->backlog) {
288 ret = -ENOMEM;
289 kfree(uevent);
290 goto out;
291 }
292 ctx->backlog--;
293 } else if (!ctx->uid) {
294 /*
295 * We ignore events for new connections until userspace has set
296 * their context. This can only happen if an error occurs on a
297 * new connection before the user accepts it. This is okay,
298 * since the accept will just fail later.
299 */
300 kfree(uevent);
301 goto out;
302 }
303
304 list_add_tail(&uevent->list, &ctx->file->event_list);
305 wake_up_interruptible(&ctx->file->poll_wait);
306out:
307 mutex_unlock(&ctx->file->mut);
308 return ret;
309}
310
311static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
312 int in_len, int out_len)
313{
314 struct ucma_context *ctx;
315 struct rdma_ucm_get_event cmd;
316 struct ucma_event *uevent;
317 int ret = 0;
318 DEFINE_WAIT(wait);
319
320 if (out_len < sizeof uevent->resp)
321 return -ENOSPC;
322
323 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
324 return -EFAULT;
325
326 mutex_lock(&file->mut);
327 while (list_empty(&file->event_list)) {
328 mutex_unlock(&file->mut);
329
330 if (file->filp->f_flags & O_NONBLOCK)
331 return -EAGAIN;
332
333 if (wait_event_interruptible(file->poll_wait,
334 !list_empty(&file->event_list)))
335 return -ERESTARTSYS;
336
337 mutex_lock(&file->mut);
338 }
339
340 uevent = list_entry(file->event_list.next, struct ucma_event, list);
341
342 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
343 ctx = ucma_alloc_ctx(file);
344 if (!ctx) {
345 ret = -ENOMEM;
346 goto done;
347 }
348 uevent->ctx->backlog++;
349 ctx->cm_id = uevent->cm_id;
350 ctx->cm_id->context = ctx;
351 uevent->resp.id = ctx->id;
352 }
353
354 if (copy_to_user((void __user *)(unsigned long)cmd.response,
355 &uevent->resp, sizeof uevent->resp)) {
356 ret = -EFAULT;
357 goto done;
358 }
359
360 list_del(&uevent->list);
361 uevent->ctx->events_reported++;
362 if (uevent->mc)
363 uevent->mc->events_reported++;
364 kfree(uevent);
365done:
366 mutex_unlock(&file->mut);
367 return ret;
368}
369
370static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
371{
372 switch (cmd->ps) {
373 case RDMA_PS_TCP:
374 *qp_type = IB_QPT_RC;
375 return 0;
376 case RDMA_PS_UDP:
377 case RDMA_PS_IPOIB:
378 *qp_type = IB_QPT_UD;
379 return 0;
380 default:
381 return -EINVAL;
382 }
383}
384
385static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
386 int in_len, int out_len)
387{
388 struct rdma_ucm_create_id cmd;
389 struct rdma_ucm_create_id_resp resp;
390 struct ucma_context *ctx;
391 enum ib_qp_type qp_type;
392 int ret;
393
394 if (out_len < sizeof(resp))
395 return -ENOSPC;
396
397 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
398 return -EFAULT;
399
400 ret = ucma_get_qp_type(&cmd, &qp_type);
401 if (ret)
402 return ret;
403
404 mutex_lock(&file->mut);
405 ctx = ucma_alloc_ctx(file);
406 mutex_unlock(&file->mut);
407 if (!ctx)
408 return -ENOMEM;
409
410 ctx->uid = cmd.uid;
411 ctx->cm_id = rdma_create_id(ucma_event_handler, ctx, cmd.ps, qp_type);
412 if (IS_ERR(ctx->cm_id)) {
413 ret = PTR_ERR(ctx->cm_id);
414 goto err1;
415 }
416
417 resp.id = ctx->id;
418 if (copy_to_user((void __user *)(unsigned long)cmd.response,
419 &resp, sizeof(resp))) {
420 ret = -EFAULT;
421 goto err2;
422 }
423 return 0;
424
425err2:
426 rdma_destroy_id(ctx->cm_id);
427err1:
428 mutex_lock(&mut);
429 idr_remove(&ctx_idr, ctx->id);
430 mutex_unlock(&mut);
431 kfree(ctx);
432 return ret;
433}
434
435static void ucma_cleanup_multicast(struct ucma_context *ctx)
436{
437 struct ucma_multicast *mc, *tmp;
438
439 mutex_lock(&mut);
440 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
441 list_del(&mc->list);
442 idr_remove(&multicast_idr, mc->id);
443 kfree(mc);
444 }
445 mutex_unlock(&mut);
446}
447
448static void ucma_cleanup_events(struct ucma_context *ctx)
449{
450 struct ucma_event *uevent, *tmp;
451
452 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
453 if (uevent->ctx != ctx)
454 continue;
455
456 list_del(&uevent->list);
457
458 /* clear incoming connections. */
459 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
460 rdma_destroy_id(uevent->cm_id);
461
462 kfree(uevent);
463 }
464}
465
466static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
467{
468 struct ucma_event *uevent, *tmp;
469
470 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
471 if (uevent->mc != mc)
472 continue;
473
474 list_del(&uevent->list);
475 kfree(uevent);
476 }
477}
478
479static int ucma_free_ctx(struct ucma_context *ctx)
480{
481 int events_reported;
482
483 /* No new events will be generated after destroying the id. */
484 rdma_destroy_id(ctx->cm_id);
485
486 ucma_cleanup_multicast(ctx);
487
488 /* Cleanup events not yet reported to the user. */
489 mutex_lock(&ctx->file->mut);
490 ucma_cleanup_events(ctx);
491 list_del(&ctx->list);
492 mutex_unlock(&ctx->file->mut);
493
494 events_reported = ctx->events_reported;
495 kfree(ctx);
496 return events_reported;
497}
498
499static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
500 int in_len, int out_len)
501{
502 struct rdma_ucm_destroy_id cmd;
503 struct rdma_ucm_destroy_id_resp resp;
504 struct ucma_context *ctx;
505 int ret = 0;
506
507 if (out_len < sizeof(resp))
508 return -ENOSPC;
509
510 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
511 return -EFAULT;
512
513 mutex_lock(&mut);
514 ctx = _ucma_find_context(cmd.id, file);
515 if (!IS_ERR(ctx))
516 idr_remove(&ctx_idr, ctx->id);
517 mutex_unlock(&mut);
518
519 if (IS_ERR(ctx))
520 return PTR_ERR(ctx);
521
522 ucma_put_ctx(ctx);
523 wait_for_completion(&ctx->comp);
524 resp.events_reported = ucma_free_ctx(ctx);
525
526 if (copy_to_user((void __user *)(unsigned long)cmd.response,
527 &resp, sizeof(resp)))
528 ret = -EFAULT;
529
530 return ret;
531}
532
533static ssize_t ucma_bind_addr(struct ucma_file *file, const char __user *inbuf,
534 int in_len, int out_len)
535{
536 struct rdma_ucm_bind_addr cmd;
537 struct ucma_context *ctx;
538 int ret;
539
540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
541 return -EFAULT;
542
543 ctx = ucma_get_ctx(file, cmd.id);
544 if (IS_ERR(ctx))
545 return PTR_ERR(ctx);
546
547 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
548 ucma_put_ctx(ctx);
549 return ret;
550}
551
552static ssize_t ucma_resolve_addr(struct ucma_file *file,
553 const char __user *inbuf,
554 int in_len, int out_len)
555{
556 struct rdma_ucm_resolve_addr cmd;
557 struct ucma_context *ctx;
558 int ret;
559
560 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
561 return -EFAULT;
562
563 ctx = ucma_get_ctx(file, cmd.id);
564 if (IS_ERR(ctx))
565 return PTR_ERR(ctx);
566
567 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
568 (struct sockaddr *) &cmd.dst_addr,
569 cmd.timeout_ms);
570 ucma_put_ctx(ctx);
571 return ret;
572}
573
574static ssize_t ucma_resolve_route(struct ucma_file *file,
575 const char __user *inbuf,
576 int in_len, int out_len)
577{
578 struct rdma_ucm_resolve_route cmd;
579 struct ucma_context *ctx;
580 int ret;
581
582 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
583 return -EFAULT;
584
585 ctx = ucma_get_ctx(file, cmd.id);
586 if (IS_ERR(ctx))
587 return PTR_ERR(ctx);
588
589 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
590 ucma_put_ctx(ctx);
591 return ret;
592}
593
594static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
595 struct rdma_route *route)
596{
597 struct rdma_dev_addr *dev_addr;
598
599 resp->num_paths = route->num_paths;
600 switch (route->num_paths) {
601 case 0:
602 dev_addr = &route->addr.dev_addr;
603 rdma_addr_get_dgid(dev_addr,
604 (union ib_gid *) &resp->ib_route[0].dgid);
605 rdma_addr_get_sgid(dev_addr,
606 (union ib_gid *) &resp->ib_route[0].sgid);
607 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
608 break;
609 case 2:
610 ib_copy_path_rec_to_user(&resp->ib_route[1],
611 &route->path_rec[1]);
612 /* fall through */
613 case 1:
614 ib_copy_path_rec_to_user(&resp->ib_route[0],
615 &route->path_rec[0]);
616 break;
617 default:
618 break;
619 }
620}
621
622static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
623 struct rdma_route *route)
624{
625 struct rdma_dev_addr *dev_addr;
626 struct net_device *dev;
627 u16 vid = 0;
628
629 resp->num_paths = route->num_paths;
630 switch (route->num_paths) {
631 case 0:
632 dev_addr = &route->addr.dev_addr;
633 dev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
634 if (dev) {
635 vid = rdma_vlan_dev_vlan_id(dev);
636 dev_put(dev);
637 }
638
639 iboe_mac_vlan_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
640 dev_addr->dst_dev_addr, vid);
641 iboe_addr_get_sgid(dev_addr,
642 (union ib_gid *) &resp->ib_route[0].sgid);
643 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
644 break;
645 case 2:
646 ib_copy_path_rec_to_user(&resp->ib_route[1],
647 &route->path_rec[1]);
648 /* fall through */
649 case 1:
650 ib_copy_path_rec_to_user(&resp->ib_route[0],
651 &route->path_rec[0]);
652 break;
653 default:
654 break;
655 }
656}
657
658static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
659 struct rdma_route *route)
660{
661 struct rdma_dev_addr *dev_addr;
662
663 dev_addr = &route->addr.dev_addr;
664 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
665 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
666}
667
668static ssize_t ucma_query_route(struct ucma_file *file,
669 const char __user *inbuf,
670 int in_len, int out_len)
671{
672 struct rdma_ucm_query_route cmd;
673 struct rdma_ucm_query_route_resp resp;
674 struct ucma_context *ctx;
675 struct sockaddr *addr;
676 int ret = 0;
677
678 if (out_len < sizeof(resp))
679 return -ENOSPC;
680
681 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
682 return -EFAULT;
683
684 ctx = ucma_get_ctx(file, cmd.id);
685 if (IS_ERR(ctx))
686 return PTR_ERR(ctx);
687
688 memset(&resp, 0, sizeof resp);
689 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
690 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
691 sizeof(struct sockaddr_in) :
692 sizeof(struct sockaddr_in6));
693 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
694 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
695 sizeof(struct sockaddr_in) :
696 sizeof(struct sockaddr_in6));
697 if (!ctx->cm_id->device)
698 goto out;
699
700 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
701 resp.port_num = ctx->cm_id->port_num;
702 switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
703 case RDMA_TRANSPORT_IB:
704 switch (rdma_port_get_link_layer(ctx->cm_id->device,
705 ctx->cm_id->port_num)) {
706 case IB_LINK_LAYER_INFINIBAND:
707 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
708 break;
709 case IB_LINK_LAYER_ETHERNET:
710 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
711 break;
712 default:
713 break;
714 }
715 break;
716 case RDMA_TRANSPORT_IWARP:
717 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
718 break;
719 default:
720 break;
721 }
722
723out:
724 if (copy_to_user((void __user *)(unsigned long)cmd.response,
725 &resp, sizeof(resp)))
726 ret = -EFAULT;
727
728 ucma_put_ctx(ctx);
729 return ret;
730}
731
732static void ucma_copy_conn_param(struct rdma_conn_param *dst,
733 struct rdma_ucm_conn_param *src)
734{
735 dst->private_data = src->private_data;
736 dst->private_data_len = src->private_data_len;
737 dst->responder_resources =src->responder_resources;
738 dst->initiator_depth = src->initiator_depth;
739 dst->flow_control = src->flow_control;
740 dst->retry_count = src->retry_count;
741 dst->rnr_retry_count = src->rnr_retry_count;
742 dst->srq = src->srq;
743 dst->qp_num = src->qp_num;
744}
745
746static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
747 int in_len, int out_len)
748{
749 struct rdma_ucm_connect cmd;
750 struct rdma_conn_param conn_param;
751 struct ucma_context *ctx;
752 int ret;
753
754 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
755 return -EFAULT;
756
757 if (!cmd.conn_param.valid)
758 return -EINVAL;
759
760 ctx = ucma_get_ctx(file, cmd.id);
761 if (IS_ERR(ctx))
762 return PTR_ERR(ctx);
763
764 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
765 ret = rdma_connect(ctx->cm_id, &conn_param);
766 ucma_put_ctx(ctx);
767 return ret;
768}
769
770static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
771 int in_len, int out_len)
772{
773 struct rdma_ucm_listen cmd;
774 struct ucma_context *ctx;
775 int ret;
776
777 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
778 return -EFAULT;
779
780 ctx = ucma_get_ctx(file, cmd.id);
781 if (IS_ERR(ctx))
782 return PTR_ERR(ctx);
783
784 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
785 cmd.backlog : max_backlog;
786 ret = rdma_listen(ctx->cm_id, ctx->backlog);
787 ucma_put_ctx(ctx);
788 return ret;
789}
790
791static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
792 int in_len, int out_len)
793{
794 struct rdma_ucm_accept cmd;
795 struct rdma_conn_param conn_param;
796 struct ucma_context *ctx;
797 int ret;
798
799 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
800 return -EFAULT;
801
802 ctx = ucma_get_ctx(file, cmd.id);
803 if (IS_ERR(ctx))
804 return PTR_ERR(ctx);
805
806 if (cmd.conn_param.valid) {
807 ctx->uid = cmd.uid;
808 ucma_copy_conn_param(&conn_param, &cmd.conn_param);
809 ret = rdma_accept(ctx->cm_id, &conn_param);
810 } else
811 ret = rdma_accept(ctx->cm_id, NULL);
812
813 ucma_put_ctx(ctx);
814 return ret;
815}
816
817static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
818 int in_len, int out_len)
819{
820 struct rdma_ucm_reject cmd;
821 struct ucma_context *ctx;
822 int ret;
823
824 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
825 return -EFAULT;
826
827 ctx = ucma_get_ctx(file, cmd.id);
828 if (IS_ERR(ctx))
829 return PTR_ERR(ctx);
830
831 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
832 ucma_put_ctx(ctx);
833 return ret;
834}
835
836static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
837 int in_len, int out_len)
838{
839 struct rdma_ucm_disconnect cmd;
840 struct ucma_context *ctx;
841 int ret;
842
843 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
844 return -EFAULT;
845
846 ctx = ucma_get_ctx(file, cmd.id);
847 if (IS_ERR(ctx))
848 return PTR_ERR(ctx);
849
850 ret = rdma_disconnect(ctx->cm_id);
851 ucma_put_ctx(ctx);
852 return ret;
853}
854
855static ssize_t ucma_init_qp_attr(struct ucma_file *file,
856 const char __user *inbuf,
857 int in_len, int out_len)
858{
859 struct rdma_ucm_init_qp_attr cmd;
860 struct ib_uverbs_qp_attr resp;
861 struct ucma_context *ctx;
862 struct ib_qp_attr qp_attr;
863 int ret;
864
865 if (out_len < sizeof(resp))
866 return -ENOSPC;
867
868 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
869 return -EFAULT;
870
871 ctx = ucma_get_ctx(file, cmd.id);
872 if (IS_ERR(ctx))
873 return PTR_ERR(ctx);
874
875 resp.qp_attr_mask = 0;
876 memset(&qp_attr, 0, sizeof qp_attr);
877 qp_attr.qp_state = cmd.qp_state;
878 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
879 if (ret)
880 goto out;
881
882 ib_copy_qp_attr_to_user(&resp, &qp_attr);
883 if (copy_to_user((void __user *)(unsigned long)cmd.response,
884 &resp, sizeof(resp)))
885 ret = -EFAULT;
886
887out:
888 ucma_put_ctx(ctx);
889 return ret;
890}
891
892static int ucma_set_option_id(struct ucma_context *ctx, int optname,
893 void *optval, size_t optlen)
894{
895 int ret = 0;
896
897 switch (optname) {
898 case RDMA_OPTION_ID_TOS:
899 if (optlen != sizeof(u8)) {
900 ret = -EINVAL;
901 break;
902 }
903 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
904 break;
905 case RDMA_OPTION_ID_REUSEADDR:
906 if (optlen != sizeof(int)) {
907 ret = -EINVAL;
908 break;
909 }
910 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
911 break;
912 default:
913 ret = -ENOSYS;
914 }
915
916 return ret;
917}
918
919static int ucma_set_ib_path(struct ucma_context *ctx,
920 struct ib_path_rec_data *path_data, size_t optlen)
921{
922 struct ib_sa_path_rec sa_path;
923 struct rdma_cm_event event;
924 int ret;
925
926 if (optlen % sizeof(*path_data))
927 return -EINVAL;
928
929 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
930 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
931 IB_PATH_BIDIRECTIONAL))
932 break;
933 }
934
935 if (!optlen)
936 return -EINVAL;
937
938 ib_sa_unpack_path(path_data->path_rec, &sa_path);
939 ret = rdma_set_ib_paths(ctx->cm_id, &sa_path, 1);
940 if (ret)
941 return ret;
942
943 memset(&event, 0, sizeof event);
944 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
945 return ucma_event_handler(ctx->cm_id, &event);
946}
947
948static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
949 void *optval, size_t optlen)
950{
951 int ret;
952
953 switch (optname) {
954 case RDMA_OPTION_IB_PATH:
955 ret = ucma_set_ib_path(ctx, optval, optlen);
956 break;
957 default:
958 ret = -ENOSYS;
959 }
960
961 return ret;
962}
963
964static int ucma_set_option_level(struct ucma_context *ctx, int level,
965 int optname, void *optval, size_t optlen)
966{
967 int ret;
968
969 switch (level) {
970 case RDMA_OPTION_ID:
971 ret = ucma_set_option_id(ctx, optname, optval, optlen);
972 break;
973 case RDMA_OPTION_IB:
974 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
975 break;
976 default:
977 ret = -ENOSYS;
978 }
979
980 return ret;
981}
982
983static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
984 int in_len, int out_len)
985{
986 struct rdma_ucm_set_option cmd;
987 struct ucma_context *ctx;
988 void *optval;
989 int ret;
990
991 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
992 return -EFAULT;
993
994 ctx = ucma_get_ctx(file, cmd.id);
995 if (IS_ERR(ctx))
996 return PTR_ERR(ctx);
997
998 optval = kmalloc(cmd.optlen, GFP_KERNEL);
999 if (!optval) {
1000 ret = -ENOMEM;
1001 goto out1;
1002 }
1003
1004 if (copy_from_user(optval, (void __user *) (unsigned long) cmd.optval,
1005 cmd.optlen)) {
1006 ret = -EFAULT;
1007 goto out2;
1008 }
1009
1010 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1011 cmd.optlen);
1012out2:
1013 kfree(optval);
1014out1:
1015 ucma_put_ctx(ctx);
1016 return ret;
1017}
1018
1019static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1020 int in_len, int out_len)
1021{
1022 struct rdma_ucm_notify cmd;
1023 struct ucma_context *ctx;
1024 int ret;
1025
1026 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1027 return -EFAULT;
1028
1029 ctx = ucma_get_ctx(file, cmd.id);
1030 if (IS_ERR(ctx))
1031 return PTR_ERR(ctx);
1032
1033 ret = rdma_notify(ctx->cm_id, (enum ib_event_type) cmd.event);
1034 ucma_put_ctx(ctx);
1035 return ret;
1036}
1037
1038static ssize_t ucma_join_multicast(struct ucma_file *file,
1039 const char __user *inbuf,
1040 int in_len, int out_len)
1041{
1042 struct rdma_ucm_join_mcast cmd;
1043 struct rdma_ucm_create_id_resp resp;
1044 struct ucma_context *ctx;
1045 struct ucma_multicast *mc;
1046 int ret;
1047
1048 if (out_len < sizeof(resp))
1049 return -ENOSPC;
1050
1051 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1052 return -EFAULT;
1053
1054 ctx = ucma_get_ctx(file, cmd.id);
1055 if (IS_ERR(ctx))
1056 return PTR_ERR(ctx);
1057
1058 mutex_lock(&file->mut);
1059 mc = ucma_alloc_multicast(ctx);
1060 if (!mc) {
1061 ret = -ENOMEM;
1062 goto err1;
1063 }
1064
1065 mc->uid = cmd.uid;
1066 memcpy(&mc->addr, &cmd.addr, sizeof cmd.addr);
1067 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr, mc);
1068 if (ret)
1069 goto err2;
1070
1071 resp.id = mc->id;
1072 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1073 &resp, sizeof(resp))) {
1074 ret = -EFAULT;
1075 goto err3;
1076 }
1077
1078 mutex_unlock(&file->mut);
1079 ucma_put_ctx(ctx);
1080 return 0;
1081
1082err3:
1083 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1084 ucma_cleanup_mc_events(mc);
1085err2:
1086 mutex_lock(&mut);
1087 idr_remove(&multicast_idr, mc->id);
1088 mutex_unlock(&mut);
1089 list_del(&mc->list);
1090 kfree(mc);
1091err1:
1092 mutex_unlock(&file->mut);
1093 ucma_put_ctx(ctx);
1094 return ret;
1095}
1096
1097static ssize_t ucma_leave_multicast(struct ucma_file *file,
1098 const char __user *inbuf,
1099 int in_len, int out_len)
1100{
1101 struct rdma_ucm_destroy_id cmd;
1102 struct rdma_ucm_destroy_id_resp resp;
1103 struct ucma_multicast *mc;
1104 int ret = 0;
1105
1106 if (out_len < sizeof(resp))
1107 return -ENOSPC;
1108
1109 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1110 return -EFAULT;
1111
1112 mutex_lock(&mut);
1113 mc = idr_find(&multicast_idr, cmd.id);
1114 if (!mc)
1115 mc = ERR_PTR(-ENOENT);
1116 else if (mc->ctx->file != file)
1117 mc = ERR_PTR(-EINVAL);
1118 else {
1119 idr_remove(&multicast_idr, mc->id);
1120 atomic_inc(&mc->ctx->ref);
1121 }
1122 mutex_unlock(&mut);
1123
1124 if (IS_ERR(mc)) {
1125 ret = PTR_ERR(mc);
1126 goto out;
1127 }
1128
1129 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1130 mutex_lock(&mc->ctx->file->mut);
1131 ucma_cleanup_mc_events(mc);
1132 list_del(&mc->list);
1133 mutex_unlock(&mc->ctx->file->mut);
1134
1135 ucma_put_ctx(mc->ctx);
1136 resp.events_reported = mc->events_reported;
1137 kfree(mc);
1138
1139 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1140 &resp, sizeof(resp)))
1141 ret = -EFAULT;
1142out:
1143 return ret;
1144}
1145
1146static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1147{
1148 /* Acquire mutex's based on pointer comparison to prevent deadlock. */
1149 if (file1 < file2) {
1150 mutex_lock(&file1->mut);
1151 mutex_lock(&file2->mut);
1152 } else {
1153 mutex_lock(&file2->mut);
1154 mutex_lock(&file1->mut);
1155 }
1156}
1157
1158static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1159{
1160 if (file1 < file2) {
1161 mutex_unlock(&file2->mut);
1162 mutex_unlock(&file1->mut);
1163 } else {
1164 mutex_unlock(&file1->mut);
1165 mutex_unlock(&file2->mut);
1166 }
1167}
1168
1169static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1170{
1171 struct ucma_event *uevent, *tmp;
1172
1173 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1174 if (uevent->ctx == ctx)
1175 list_move_tail(&uevent->list, &file->event_list);
1176}
1177
1178static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1179 const char __user *inbuf,
1180 int in_len, int out_len)
1181{
1182 struct rdma_ucm_migrate_id cmd;
1183 struct rdma_ucm_migrate_resp resp;
1184 struct ucma_context *ctx;
1185 struct file *filp;
1186 struct ucma_file *cur_file;
1187 int ret = 0;
1188
1189 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1190 return -EFAULT;
1191
1192 /* Get current fd to protect against it being closed */
1193 filp = fget(cmd.fd);
1194 if (!filp)
1195 return -ENOENT;
1196
1197 /* Validate current fd and prevent destruction of id. */
1198 ctx = ucma_get_ctx(filp->private_data, cmd.id);
1199 if (IS_ERR(ctx)) {
1200 ret = PTR_ERR(ctx);
1201 goto file_put;
1202 }
1203
1204 cur_file = ctx->file;
1205 if (cur_file == new_file) {
1206 resp.events_reported = ctx->events_reported;
1207 goto response;
1208 }
1209
1210 /*
1211 * Migrate events between fd's, maintaining order, and avoiding new
1212 * events being added before existing events.
1213 */
1214 ucma_lock_files(cur_file, new_file);
1215 mutex_lock(&mut);
1216
1217 list_move_tail(&ctx->list, &new_file->ctx_list);
1218 ucma_move_events(ctx, new_file);
1219 ctx->file = new_file;
1220 resp.events_reported = ctx->events_reported;
1221
1222 mutex_unlock(&mut);
1223 ucma_unlock_files(cur_file, new_file);
1224
1225response:
1226 if (copy_to_user((void __user *)(unsigned long)cmd.response,
1227 &resp, sizeof(resp)))
1228 ret = -EFAULT;
1229
1230 ucma_put_ctx(ctx);
1231file_put:
1232 fput(filp);
1233 return ret;
1234}
1235
1236static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1237 const char __user *inbuf,
1238 int in_len, int out_len) = {
1239 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1240 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1241 [RDMA_USER_CM_CMD_BIND_ADDR] = ucma_bind_addr,
1242 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1243 [RDMA_USER_CM_CMD_RESOLVE_ROUTE]= ucma_resolve_route,
1244 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1245 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1246 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1247 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1248 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1249 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1250 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1251 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1252 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1253 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1254 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1255 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast,
1256 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1257 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id
1258};
1259
1260static ssize_t ucma_write(struct file *filp, const char __user *buf,
1261 size_t len, loff_t *pos)
1262{
1263 struct ucma_file *file = filp->private_data;
1264 struct rdma_ucm_cmd_hdr hdr;
1265 ssize_t ret;
1266
1267 if (len < sizeof(hdr))
1268 return -EINVAL;
1269
1270 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1271 return -EFAULT;
1272
1273 if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1274 return -EINVAL;
1275
1276 if (hdr.in + sizeof(hdr) > len)
1277 return -EINVAL;
1278
1279 if (!ucma_cmd_table[hdr.cmd])
1280 return -ENOSYS;
1281
1282 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1283 if (!ret)
1284 ret = len;
1285
1286 return ret;
1287}
1288
1289static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
1290{
1291 struct ucma_file *file = filp->private_data;
1292 unsigned int mask = 0;
1293
1294 poll_wait(filp, &file->poll_wait, wait);
1295
1296 if (!list_empty(&file->event_list))
1297 mask = POLLIN | POLLRDNORM;
1298
1299 return mask;
1300}
1301
1302/*
1303 * ucma_open() does not need the BKL:
1304 *
1305 * - no global state is referred to;
1306 * - there is no ioctl method to race against;
1307 * - no further module initialization is required for open to work
1308 * after the device is registered.
1309 */
1310static int ucma_open(struct inode *inode, struct file *filp)
1311{
1312 struct ucma_file *file;
1313
1314 file = kmalloc(sizeof *file, GFP_KERNEL);
1315 if (!file)
1316 return -ENOMEM;
1317
1318 INIT_LIST_HEAD(&file->event_list);
1319 INIT_LIST_HEAD(&file->ctx_list);
1320 init_waitqueue_head(&file->poll_wait);
1321 mutex_init(&file->mut);
1322
1323 filp->private_data = file;
1324 file->filp = filp;
1325
1326 return nonseekable_open(inode, filp);
1327}
1328
1329static int ucma_close(struct inode *inode, struct file *filp)
1330{
1331 struct ucma_file *file = filp->private_data;
1332 struct ucma_context *ctx, *tmp;
1333
1334 mutex_lock(&file->mut);
1335 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1336 mutex_unlock(&file->mut);
1337
1338 mutex_lock(&mut);
1339 idr_remove(&ctx_idr, ctx->id);
1340 mutex_unlock(&mut);
1341
1342 ucma_free_ctx(ctx);
1343 mutex_lock(&file->mut);
1344 }
1345 mutex_unlock(&file->mut);
1346 kfree(file);
1347 return 0;
1348}
1349
1350static const struct file_operations ucma_fops = {
1351 .owner = THIS_MODULE,
1352 .open = ucma_open,
1353 .release = ucma_close,
1354 .write = ucma_write,
1355 .poll = ucma_poll,
1356 .llseek = no_llseek,
1357};
1358
1359static struct miscdevice ucma_misc = {
1360 .minor = MISC_DYNAMIC_MINOR,
1361 .name = "rdma_cm",
1362 .nodename = "infiniband/rdma_cm",
1363 .mode = 0666,
1364 .fops = &ucma_fops,
1365};
1366
1367static ssize_t show_abi_version(struct device *dev,
1368 struct device_attribute *attr,
1369 char *buf)
1370{
1371 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1372}
1373static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1374
1375static int __init ucma_init(void)
1376{
1377 int ret;
1378
1379 ret = misc_register(&ucma_misc);
1380 if (ret)
1381 return ret;
1382
1383 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1384 if (ret) {
1385 printk(KERN_ERR "rdma_ucm: couldn't create abi_version attr\n");
1386 goto err1;
1387 }
1388
1389 ucma_ctl_table_hdr = register_sysctl_paths(ucma_ctl_path, ucma_ctl_table);
1390 if (!ucma_ctl_table_hdr) {
1391 printk(KERN_ERR "rdma_ucm: couldn't register sysctl paths\n");
1392 ret = -ENOMEM;
1393 goto err2;
1394 }
1395 return 0;
1396err2:
1397 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1398err1:
1399 misc_deregister(&ucma_misc);
1400 return ret;
1401}
1402
1403static void __exit ucma_cleanup(void)
1404{
1405 unregister_sysctl_table(ucma_ctl_table_hdr);
1406 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1407 misc_deregister(&ucma_misc);
1408 idr_destroy(&ctx_idr);
1409}
1410
1411module_init(ucma_init);
1412module_exit(ucma_cleanup);
1/*
2 * Copyright (c) 2005-2006 Intel Corporation. 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/completion.h>
34#include <linux/file.h>
35#include <linux/mutex.h>
36#include <linux/poll.h>
37#include <linux/sched.h>
38#include <linux/idr.h>
39#include <linux/in.h>
40#include <linux/in6.h>
41#include <linux/miscdevice.h>
42#include <linux/slab.h>
43#include <linux/sysctl.h>
44#include <linux/module.h>
45#include <linux/nsproxy.h>
46
47#include <linux/nospec.h>
48
49#include <rdma/rdma_user_cm.h>
50#include <rdma/ib_marshall.h>
51#include <rdma/rdma_cm.h>
52#include <rdma/rdma_cm_ib.h>
53#include <rdma/ib_addr.h>
54#include <rdma/ib.h>
55#include <rdma/ib_cm.h>
56#include <rdma/rdma_netlink.h>
57#include "core_priv.h"
58
59MODULE_AUTHOR("Sean Hefty");
60MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
61MODULE_LICENSE("Dual BSD/GPL");
62
63static unsigned int max_backlog = 1024;
64
65static struct ctl_table_header *ucma_ctl_table_hdr;
66static struct ctl_table ucma_ctl_table[] = {
67 {
68 .procname = "max_backlog",
69 .data = &max_backlog,
70 .maxlen = sizeof max_backlog,
71 .mode = 0644,
72 .proc_handler = proc_dointvec,
73 },
74 { }
75};
76
77struct ucma_file {
78 struct mutex mut;
79 struct file *filp;
80 struct list_head ctx_list;
81 struct list_head event_list;
82 wait_queue_head_t poll_wait;
83};
84
85struct ucma_context {
86 u32 id;
87 struct completion comp;
88 refcount_t ref;
89 int events_reported;
90 atomic_t backlog;
91
92 struct ucma_file *file;
93 struct rdma_cm_id *cm_id;
94 struct mutex mutex;
95 u64 uid;
96
97 struct list_head list;
98 struct work_struct close_work;
99};
100
101struct ucma_multicast {
102 struct ucma_context *ctx;
103 u32 id;
104 int events_reported;
105
106 u64 uid;
107 u8 join_state;
108 struct sockaddr_storage addr;
109};
110
111struct ucma_event {
112 struct ucma_context *ctx;
113 struct ucma_context *conn_req_ctx;
114 struct ucma_multicast *mc;
115 struct list_head list;
116 struct rdma_ucm_event_resp resp;
117};
118
119static DEFINE_XARRAY_ALLOC(ctx_table);
120static DEFINE_XARRAY_ALLOC(multicast_table);
121
122static const struct file_operations ucma_fops;
123static int ucma_destroy_private_ctx(struct ucma_context *ctx);
124
125static inline struct ucma_context *_ucma_find_context(int id,
126 struct ucma_file *file)
127{
128 struct ucma_context *ctx;
129
130 ctx = xa_load(&ctx_table, id);
131 if (!ctx)
132 ctx = ERR_PTR(-ENOENT);
133 else if (ctx->file != file)
134 ctx = ERR_PTR(-EINVAL);
135 return ctx;
136}
137
138static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
139{
140 struct ucma_context *ctx;
141
142 xa_lock(&ctx_table);
143 ctx = _ucma_find_context(id, file);
144 if (!IS_ERR(ctx))
145 if (!refcount_inc_not_zero(&ctx->ref))
146 ctx = ERR_PTR(-ENXIO);
147 xa_unlock(&ctx_table);
148 return ctx;
149}
150
151static void ucma_put_ctx(struct ucma_context *ctx)
152{
153 if (refcount_dec_and_test(&ctx->ref))
154 complete(&ctx->comp);
155}
156
157/*
158 * Same as ucm_get_ctx but requires that ->cm_id->device is valid, eg that the
159 * CM_ID is bound.
160 */
161static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
162{
163 struct ucma_context *ctx = ucma_get_ctx(file, id);
164
165 if (IS_ERR(ctx))
166 return ctx;
167 if (!ctx->cm_id->device) {
168 ucma_put_ctx(ctx);
169 return ERR_PTR(-EINVAL);
170 }
171 return ctx;
172}
173
174static void ucma_close_id(struct work_struct *work)
175{
176 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
177
178 /* once all inflight tasks are finished, we close all underlying
179 * resources. The context is still alive till its explicit destryoing
180 * by its creator. This puts back the xarray's reference.
181 */
182 ucma_put_ctx(ctx);
183 wait_for_completion(&ctx->comp);
184 /* No new events will be generated after destroying the id. */
185 rdma_destroy_id(ctx->cm_id);
186
187 /* Reading the cm_id without holding a positive ref is not allowed */
188 ctx->cm_id = NULL;
189}
190
191static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
192{
193 struct ucma_context *ctx;
194
195 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
196 if (!ctx)
197 return NULL;
198
199 INIT_WORK(&ctx->close_work, ucma_close_id);
200 init_completion(&ctx->comp);
201 /* So list_del() will work if we don't do ucma_finish_ctx() */
202 INIT_LIST_HEAD(&ctx->list);
203 ctx->file = file;
204 mutex_init(&ctx->mutex);
205
206 if (xa_alloc(&ctx_table, &ctx->id, NULL, xa_limit_32b, GFP_KERNEL)) {
207 kfree(ctx);
208 return NULL;
209 }
210 return ctx;
211}
212
213static void ucma_set_ctx_cm_id(struct ucma_context *ctx,
214 struct rdma_cm_id *cm_id)
215{
216 refcount_set(&ctx->ref, 1);
217 ctx->cm_id = cm_id;
218}
219
220static void ucma_finish_ctx(struct ucma_context *ctx)
221{
222 lockdep_assert_held(&ctx->file->mut);
223 list_add_tail(&ctx->list, &ctx->file->ctx_list);
224 xa_store(&ctx_table, ctx->id, ctx, GFP_KERNEL);
225}
226
227static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
228 struct rdma_conn_param *src)
229{
230 if (src->private_data_len)
231 memcpy(dst->private_data, src->private_data,
232 src->private_data_len);
233 dst->private_data_len = src->private_data_len;
234 dst->responder_resources = src->responder_resources;
235 dst->initiator_depth = src->initiator_depth;
236 dst->flow_control = src->flow_control;
237 dst->retry_count = src->retry_count;
238 dst->rnr_retry_count = src->rnr_retry_count;
239 dst->srq = src->srq;
240 dst->qp_num = src->qp_num;
241}
242
243static void ucma_copy_ud_event(struct ib_device *device,
244 struct rdma_ucm_ud_param *dst,
245 struct rdma_ud_param *src)
246{
247 if (src->private_data_len)
248 memcpy(dst->private_data, src->private_data,
249 src->private_data_len);
250 dst->private_data_len = src->private_data_len;
251 ib_copy_ah_attr_to_user(device, &dst->ah_attr, &src->ah_attr);
252 dst->qp_num = src->qp_num;
253 dst->qkey = src->qkey;
254}
255
256static struct ucma_event *ucma_create_uevent(struct ucma_context *ctx,
257 struct rdma_cm_event *event)
258{
259 struct ucma_event *uevent;
260
261 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
262 if (!uevent)
263 return NULL;
264
265 uevent->ctx = ctx;
266 switch (event->event) {
267 case RDMA_CM_EVENT_MULTICAST_JOIN:
268 case RDMA_CM_EVENT_MULTICAST_ERROR:
269 uevent->mc = (struct ucma_multicast *)
270 event->param.ud.private_data;
271 uevent->resp.uid = uevent->mc->uid;
272 uevent->resp.id = uevent->mc->id;
273 break;
274 default:
275 uevent->resp.uid = ctx->uid;
276 uevent->resp.id = ctx->id;
277 break;
278 }
279 uevent->resp.event = event->event;
280 uevent->resp.status = event->status;
281 if (ctx->cm_id->qp_type == IB_QPT_UD)
282 ucma_copy_ud_event(ctx->cm_id->device, &uevent->resp.param.ud,
283 &event->param.ud);
284 else
285 ucma_copy_conn_event(&uevent->resp.param.conn,
286 &event->param.conn);
287
288 uevent->resp.ece.vendor_id = event->ece.vendor_id;
289 uevent->resp.ece.attr_mod = event->ece.attr_mod;
290 return uevent;
291}
292
293static int ucma_connect_event_handler(struct rdma_cm_id *cm_id,
294 struct rdma_cm_event *event)
295{
296 struct ucma_context *listen_ctx = cm_id->context;
297 struct ucma_context *ctx;
298 struct ucma_event *uevent;
299
300 if (!atomic_add_unless(&listen_ctx->backlog, -1, 0))
301 return -ENOMEM;
302 ctx = ucma_alloc_ctx(listen_ctx->file);
303 if (!ctx)
304 goto err_backlog;
305 ucma_set_ctx_cm_id(ctx, cm_id);
306
307 uevent = ucma_create_uevent(listen_ctx, event);
308 if (!uevent)
309 goto err_alloc;
310 uevent->conn_req_ctx = ctx;
311 uevent->resp.id = ctx->id;
312
313 ctx->cm_id->context = ctx;
314
315 mutex_lock(&ctx->file->mut);
316 ucma_finish_ctx(ctx);
317 list_add_tail(&uevent->list, &ctx->file->event_list);
318 mutex_unlock(&ctx->file->mut);
319 wake_up_interruptible(&ctx->file->poll_wait);
320 return 0;
321
322err_alloc:
323 ucma_destroy_private_ctx(ctx);
324err_backlog:
325 atomic_inc(&listen_ctx->backlog);
326 /* Returning error causes the new ID to be destroyed */
327 return -ENOMEM;
328}
329
330static int ucma_event_handler(struct rdma_cm_id *cm_id,
331 struct rdma_cm_event *event)
332{
333 struct ucma_event *uevent;
334 struct ucma_context *ctx = cm_id->context;
335
336 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST)
337 return ucma_connect_event_handler(cm_id, event);
338
339 /*
340 * We ignore events for new connections until userspace has set their
341 * context. This can only happen if an error occurs on a new connection
342 * before the user accepts it. This is okay, since the accept will just
343 * fail later. However, we do need to release the underlying HW
344 * resources in case of a device removal event.
345 */
346 if (ctx->uid) {
347 uevent = ucma_create_uevent(ctx, event);
348 if (!uevent)
349 return 0;
350
351 mutex_lock(&ctx->file->mut);
352 list_add_tail(&uevent->list, &ctx->file->event_list);
353 mutex_unlock(&ctx->file->mut);
354 wake_up_interruptible(&ctx->file->poll_wait);
355 }
356
357 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL) {
358 xa_lock(&ctx_table);
359 if (xa_load(&ctx_table, ctx->id) == ctx)
360 queue_work(system_unbound_wq, &ctx->close_work);
361 xa_unlock(&ctx_table);
362 }
363 return 0;
364}
365
366static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
367 int in_len, int out_len)
368{
369 struct rdma_ucm_get_event cmd;
370 struct ucma_event *uevent;
371
372 /*
373 * Old 32 bit user space does not send the 4 byte padding in the
374 * reserved field. We don't care, allow it to keep working.
375 */
376 if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) -
377 sizeof(uevent->resp.ece))
378 return -ENOSPC;
379
380 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
381 return -EFAULT;
382
383 mutex_lock(&file->mut);
384 while (list_empty(&file->event_list)) {
385 mutex_unlock(&file->mut);
386
387 if (file->filp->f_flags & O_NONBLOCK)
388 return -EAGAIN;
389
390 if (wait_event_interruptible(file->poll_wait,
391 !list_empty(&file->event_list)))
392 return -ERESTARTSYS;
393
394 mutex_lock(&file->mut);
395 }
396
397 uevent = list_first_entry(&file->event_list, struct ucma_event, list);
398
399 if (copy_to_user(u64_to_user_ptr(cmd.response),
400 &uevent->resp,
401 min_t(size_t, out_len, sizeof(uevent->resp)))) {
402 mutex_unlock(&file->mut);
403 return -EFAULT;
404 }
405
406 list_del(&uevent->list);
407 uevent->ctx->events_reported++;
408 if (uevent->mc)
409 uevent->mc->events_reported++;
410 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
411 atomic_inc(&uevent->ctx->backlog);
412 mutex_unlock(&file->mut);
413
414 kfree(uevent);
415 return 0;
416}
417
418static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
419{
420 switch (cmd->ps) {
421 case RDMA_PS_TCP:
422 *qp_type = IB_QPT_RC;
423 return 0;
424 case RDMA_PS_UDP:
425 case RDMA_PS_IPOIB:
426 *qp_type = IB_QPT_UD;
427 return 0;
428 case RDMA_PS_IB:
429 *qp_type = cmd->qp_type;
430 return 0;
431 default:
432 return -EINVAL;
433 }
434}
435
436static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
437 int in_len, int out_len)
438{
439 struct rdma_ucm_create_id cmd;
440 struct rdma_ucm_create_id_resp resp;
441 struct ucma_context *ctx;
442 struct rdma_cm_id *cm_id;
443 enum ib_qp_type qp_type;
444 int ret;
445
446 if (out_len < sizeof(resp))
447 return -ENOSPC;
448
449 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
450 return -EFAULT;
451
452 ret = ucma_get_qp_type(&cmd, &qp_type);
453 if (ret)
454 return ret;
455
456 ctx = ucma_alloc_ctx(file);
457 if (!ctx)
458 return -ENOMEM;
459
460 ctx->uid = cmd.uid;
461 cm_id = rdma_create_user_id(ucma_event_handler, ctx, cmd.ps, qp_type);
462 if (IS_ERR(cm_id)) {
463 ret = PTR_ERR(cm_id);
464 goto err1;
465 }
466 ucma_set_ctx_cm_id(ctx, cm_id);
467
468 resp.id = ctx->id;
469 if (copy_to_user(u64_to_user_ptr(cmd.response),
470 &resp, sizeof(resp))) {
471 ret = -EFAULT;
472 goto err1;
473 }
474
475 mutex_lock(&file->mut);
476 ucma_finish_ctx(ctx);
477 mutex_unlock(&file->mut);
478 return 0;
479
480err1:
481 ucma_destroy_private_ctx(ctx);
482 return ret;
483}
484
485static void ucma_cleanup_multicast(struct ucma_context *ctx)
486{
487 struct ucma_multicast *mc;
488 unsigned long index;
489
490 xa_for_each(&multicast_table, index, mc) {
491 if (mc->ctx != ctx)
492 continue;
493 /*
494 * At this point mc->ctx->ref is 0 so the mc cannot leave the
495 * lock on the reader and this is enough serialization
496 */
497 xa_erase(&multicast_table, index);
498 kfree(mc);
499 }
500}
501
502static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
503{
504 struct ucma_event *uevent, *tmp;
505
506 rdma_lock_handler(mc->ctx->cm_id);
507 mutex_lock(&mc->ctx->file->mut);
508 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
509 if (uevent->mc != mc)
510 continue;
511
512 list_del(&uevent->list);
513 kfree(uevent);
514 }
515 mutex_unlock(&mc->ctx->file->mut);
516 rdma_unlock_handler(mc->ctx->cm_id);
517}
518
519static int ucma_cleanup_ctx_events(struct ucma_context *ctx)
520{
521 int events_reported;
522 struct ucma_event *uevent, *tmp;
523 LIST_HEAD(list);
524
525 /* Cleanup events not yet reported to the user.*/
526 mutex_lock(&ctx->file->mut);
527 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
528 if (uevent->ctx != ctx)
529 continue;
530
531 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST &&
532 xa_cmpxchg(&ctx_table, uevent->conn_req_ctx->id,
533 uevent->conn_req_ctx, XA_ZERO_ENTRY,
534 GFP_KERNEL) == uevent->conn_req_ctx) {
535 list_move_tail(&uevent->list, &list);
536 continue;
537 }
538 list_del(&uevent->list);
539 kfree(uevent);
540 }
541 list_del(&ctx->list);
542 events_reported = ctx->events_reported;
543 mutex_unlock(&ctx->file->mut);
544
545 /*
546 * If this was a listening ID then any connections spawned from it that
547 * have not been delivered to userspace are cleaned up too. Must be done
548 * outside any locks.
549 */
550 list_for_each_entry_safe(uevent, tmp, &list, list) {
551 ucma_destroy_private_ctx(uevent->conn_req_ctx);
552 kfree(uevent);
553 }
554 return events_reported;
555}
556
557/*
558 * When this is called the xarray must have a XA_ZERO_ENTRY in the ctx->id (ie
559 * the ctx is not public to the user). This either because:
560 * - ucma_finish_ctx() hasn't been called
561 * - xa_cmpxchg() succeed to remove the entry (only one thread can succeed)
562 */
563static int ucma_destroy_private_ctx(struct ucma_context *ctx)
564{
565 int events_reported;
566
567 /*
568 * Destroy the underlying cm_id. New work queuing is prevented now by
569 * the removal from the xarray. Once the work is cancled ref will either
570 * be 0 because the work ran to completion and consumed the ref from the
571 * xarray, or it will be positive because we still have the ref from the
572 * xarray. This can also be 0 in cases where cm_id was never set
573 */
574 cancel_work_sync(&ctx->close_work);
575 if (refcount_read(&ctx->ref))
576 ucma_close_id(&ctx->close_work);
577
578 events_reported = ucma_cleanup_ctx_events(ctx);
579 ucma_cleanup_multicast(ctx);
580
581 WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, XA_ZERO_ENTRY, NULL,
582 GFP_KERNEL) != NULL);
583 mutex_destroy(&ctx->mutex);
584 kfree(ctx);
585 return events_reported;
586}
587
588static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
589 int in_len, int out_len)
590{
591 struct rdma_ucm_destroy_id cmd;
592 struct rdma_ucm_destroy_id_resp resp;
593 struct ucma_context *ctx;
594 int ret = 0;
595
596 if (out_len < sizeof(resp))
597 return -ENOSPC;
598
599 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
600 return -EFAULT;
601
602 xa_lock(&ctx_table);
603 ctx = _ucma_find_context(cmd.id, file);
604 if (!IS_ERR(ctx)) {
605 if (__xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
606 GFP_KERNEL) != ctx)
607 ctx = ERR_PTR(-ENOENT);
608 }
609 xa_unlock(&ctx_table);
610
611 if (IS_ERR(ctx))
612 return PTR_ERR(ctx);
613
614 resp.events_reported = ucma_destroy_private_ctx(ctx);
615 if (copy_to_user(u64_to_user_ptr(cmd.response),
616 &resp, sizeof(resp)))
617 ret = -EFAULT;
618
619 return ret;
620}
621
622static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
623 int in_len, int out_len)
624{
625 struct rdma_ucm_bind_ip cmd;
626 struct ucma_context *ctx;
627 int ret;
628
629 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
630 return -EFAULT;
631
632 if (!rdma_addr_size_in6(&cmd.addr))
633 return -EINVAL;
634
635 ctx = ucma_get_ctx(file, cmd.id);
636 if (IS_ERR(ctx))
637 return PTR_ERR(ctx);
638
639 mutex_lock(&ctx->mutex);
640 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
641 mutex_unlock(&ctx->mutex);
642
643 ucma_put_ctx(ctx);
644 return ret;
645}
646
647static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
648 int in_len, int out_len)
649{
650 struct rdma_ucm_bind cmd;
651 struct ucma_context *ctx;
652 int ret;
653
654 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
655 return -EFAULT;
656
657 if (cmd.reserved || !cmd.addr_size ||
658 cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
659 return -EINVAL;
660
661 ctx = ucma_get_ctx(file, cmd.id);
662 if (IS_ERR(ctx))
663 return PTR_ERR(ctx);
664
665 mutex_lock(&ctx->mutex);
666 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
667 mutex_unlock(&ctx->mutex);
668 ucma_put_ctx(ctx);
669 return ret;
670}
671
672static ssize_t ucma_resolve_ip(struct ucma_file *file,
673 const char __user *inbuf,
674 int in_len, int out_len)
675{
676 struct rdma_ucm_resolve_ip cmd;
677 struct ucma_context *ctx;
678 int ret;
679
680 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
681 return -EFAULT;
682
683 if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
684 !rdma_addr_size_in6(&cmd.dst_addr))
685 return -EINVAL;
686
687 ctx = ucma_get_ctx(file, cmd.id);
688 if (IS_ERR(ctx))
689 return PTR_ERR(ctx);
690
691 mutex_lock(&ctx->mutex);
692 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
693 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
694 mutex_unlock(&ctx->mutex);
695 ucma_put_ctx(ctx);
696 return ret;
697}
698
699static ssize_t ucma_resolve_addr(struct ucma_file *file,
700 const char __user *inbuf,
701 int in_len, int out_len)
702{
703 struct rdma_ucm_resolve_addr cmd;
704 struct ucma_context *ctx;
705 int ret;
706
707 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
708 return -EFAULT;
709
710 if (cmd.reserved ||
711 (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
712 !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
713 return -EINVAL;
714
715 ctx = ucma_get_ctx(file, cmd.id);
716 if (IS_ERR(ctx))
717 return PTR_ERR(ctx);
718
719 mutex_lock(&ctx->mutex);
720 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
721 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
722 mutex_unlock(&ctx->mutex);
723 ucma_put_ctx(ctx);
724 return ret;
725}
726
727static ssize_t ucma_resolve_route(struct ucma_file *file,
728 const char __user *inbuf,
729 int in_len, int out_len)
730{
731 struct rdma_ucm_resolve_route cmd;
732 struct ucma_context *ctx;
733 int ret;
734
735 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
736 return -EFAULT;
737
738 ctx = ucma_get_ctx_dev(file, cmd.id);
739 if (IS_ERR(ctx))
740 return PTR_ERR(ctx);
741
742 mutex_lock(&ctx->mutex);
743 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
744 mutex_unlock(&ctx->mutex);
745 ucma_put_ctx(ctx);
746 return ret;
747}
748
749static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
750 struct rdma_route *route)
751{
752 struct rdma_dev_addr *dev_addr;
753
754 resp->num_paths = route->num_paths;
755 switch (route->num_paths) {
756 case 0:
757 dev_addr = &route->addr.dev_addr;
758 rdma_addr_get_dgid(dev_addr,
759 (union ib_gid *) &resp->ib_route[0].dgid);
760 rdma_addr_get_sgid(dev_addr,
761 (union ib_gid *) &resp->ib_route[0].sgid);
762 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
763 break;
764 case 2:
765 ib_copy_path_rec_to_user(&resp->ib_route[1],
766 &route->path_rec[1]);
767 fallthrough;
768 case 1:
769 ib_copy_path_rec_to_user(&resp->ib_route[0],
770 &route->path_rec[0]);
771 break;
772 default:
773 break;
774 }
775}
776
777static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
778 struct rdma_route *route)
779{
780
781 resp->num_paths = route->num_paths;
782 switch (route->num_paths) {
783 case 0:
784 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
785 (union ib_gid *)&resp->ib_route[0].dgid);
786 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
787 (union ib_gid *)&resp->ib_route[0].sgid);
788 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
789 break;
790 case 2:
791 ib_copy_path_rec_to_user(&resp->ib_route[1],
792 &route->path_rec[1]);
793 fallthrough;
794 case 1:
795 ib_copy_path_rec_to_user(&resp->ib_route[0],
796 &route->path_rec[0]);
797 break;
798 default:
799 break;
800 }
801}
802
803static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
804 struct rdma_route *route)
805{
806 struct rdma_dev_addr *dev_addr;
807
808 dev_addr = &route->addr.dev_addr;
809 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
810 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
811}
812
813static ssize_t ucma_query_route(struct ucma_file *file,
814 const char __user *inbuf,
815 int in_len, int out_len)
816{
817 struct rdma_ucm_query cmd;
818 struct rdma_ucm_query_route_resp resp;
819 struct ucma_context *ctx;
820 struct sockaddr *addr;
821 int ret = 0;
822
823 if (out_len < offsetof(struct rdma_ucm_query_route_resp, ibdev_index))
824 return -ENOSPC;
825
826 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
827 return -EFAULT;
828
829 ctx = ucma_get_ctx(file, cmd.id);
830 if (IS_ERR(ctx))
831 return PTR_ERR(ctx);
832
833 mutex_lock(&ctx->mutex);
834 memset(&resp, 0, sizeof resp);
835 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
836 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
837 sizeof(struct sockaddr_in) :
838 sizeof(struct sockaddr_in6));
839 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
840 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
841 sizeof(struct sockaddr_in) :
842 sizeof(struct sockaddr_in6));
843 if (!ctx->cm_id->device)
844 goto out;
845
846 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
847 resp.ibdev_index = ctx->cm_id->device->index;
848 resp.port_num = ctx->cm_id->port_num;
849
850 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
851 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
852 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
853 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
854 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
855 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
856
857out:
858 mutex_unlock(&ctx->mutex);
859 if (copy_to_user(u64_to_user_ptr(cmd.response), &resp,
860 min_t(size_t, out_len, sizeof(resp))))
861 ret = -EFAULT;
862
863 ucma_put_ctx(ctx);
864 return ret;
865}
866
867static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
868 struct rdma_ucm_query_addr_resp *resp)
869{
870 if (!cm_id->device)
871 return;
872
873 resp->node_guid = (__force __u64) cm_id->device->node_guid;
874 resp->ibdev_index = cm_id->device->index;
875 resp->port_num = cm_id->port_num;
876 resp->pkey = (__force __u16) cpu_to_be16(
877 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
878}
879
880static ssize_t ucma_query_addr(struct ucma_context *ctx,
881 void __user *response, int out_len)
882{
883 struct rdma_ucm_query_addr_resp resp;
884 struct sockaddr *addr;
885 int ret = 0;
886
887 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
888 return -ENOSPC;
889
890 memset(&resp, 0, sizeof resp);
891
892 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
893 resp.src_size = rdma_addr_size(addr);
894 memcpy(&resp.src_addr, addr, resp.src_size);
895
896 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
897 resp.dst_size = rdma_addr_size(addr);
898 memcpy(&resp.dst_addr, addr, resp.dst_size);
899
900 ucma_query_device_addr(ctx->cm_id, &resp);
901
902 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
903 ret = -EFAULT;
904
905 return ret;
906}
907
908static ssize_t ucma_query_path(struct ucma_context *ctx,
909 void __user *response, int out_len)
910{
911 struct rdma_ucm_query_path_resp *resp;
912 int i, ret = 0;
913
914 if (out_len < sizeof(*resp))
915 return -ENOSPC;
916
917 resp = kzalloc(out_len, GFP_KERNEL);
918 if (!resp)
919 return -ENOMEM;
920
921 resp->num_paths = ctx->cm_id->route.num_paths;
922 for (i = 0, out_len -= sizeof(*resp);
923 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
924 i++, out_len -= sizeof(struct ib_path_rec_data)) {
925 struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
926
927 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
928 IB_PATH_BIDIRECTIONAL;
929 if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
930 struct sa_path_rec ib;
931
932 sa_convert_path_opa_to_ib(&ib, rec);
933 ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
934
935 } else {
936 ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
937 }
938 }
939
940 if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
941 ret = -EFAULT;
942
943 kfree(resp);
944 return ret;
945}
946
947static ssize_t ucma_query_gid(struct ucma_context *ctx,
948 void __user *response, int out_len)
949{
950 struct rdma_ucm_query_addr_resp resp;
951 struct sockaddr_ib *addr;
952 int ret = 0;
953
954 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
955 return -ENOSPC;
956
957 memset(&resp, 0, sizeof resp);
958
959 ucma_query_device_addr(ctx->cm_id, &resp);
960
961 addr = (struct sockaddr_ib *) &resp.src_addr;
962 resp.src_size = sizeof(*addr);
963 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
964 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
965 } else {
966 addr->sib_family = AF_IB;
967 addr->sib_pkey = (__force __be16) resp.pkey;
968 rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr,
969 NULL);
970 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
971 &ctx->cm_id->route.addr.src_addr);
972 }
973
974 addr = (struct sockaddr_ib *) &resp.dst_addr;
975 resp.dst_size = sizeof(*addr);
976 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
977 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
978 } else {
979 addr->sib_family = AF_IB;
980 addr->sib_pkey = (__force __be16) resp.pkey;
981 rdma_read_gids(ctx->cm_id, NULL,
982 (union ib_gid *)&addr->sib_addr);
983 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
984 &ctx->cm_id->route.addr.dst_addr);
985 }
986
987 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
988 ret = -EFAULT;
989
990 return ret;
991}
992
993static ssize_t ucma_query(struct ucma_file *file,
994 const char __user *inbuf,
995 int in_len, int out_len)
996{
997 struct rdma_ucm_query cmd;
998 struct ucma_context *ctx;
999 void __user *response;
1000 int ret;
1001
1002 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1003 return -EFAULT;
1004
1005 response = u64_to_user_ptr(cmd.response);
1006 ctx = ucma_get_ctx(file, cmd.id);
1007 if (IS_ERR(ctx))
1008 return PTR_ERR(ctx);
1009
1010 mutex_lock(&ctx->mutex);
1011 switch (cmd.option) {
1012 case RDMA_USER_CM_QUERY_ADDR:
1013 ret = ucma_query_addr(ctx, response, out_len);
1014 break;
1015 case RDMA_USER_CM_QUERY_PATH:
1016 ret = ucma_query_path(ctx, response, out_len);
1017 break;
1018 case RDMA_USER_CM_QUERY_GID:
1019 ret = ucma_query_gid(ctx, response, out_len);
1020 break;
1021 default:
1022 ret = -ENOSYS;
1023 break;
1024 }
1025 mutex_unlock(&ctx->mutex);
1026
1027 ucma_put_ctx(ctx);
1028 return ret;
1029}
1030
1031static void ucma_copy_conn_param(struct rdma_cm_id *id,
1032 struct rdma_conn_param *dst,
1033 struct rdma_ucm_conn_param *src)
1034{
1035 dst->private_data = src->private_data;
1036 dst->private_data_len = src->private_data_len;
1037 dst->responder_resources = src->responder_resources;
1038 dst->initiator_depth = src->initiator_depth;
1039 dst->flow_control = src->flow_control;
1040 dst->retry_count = src->retry_count;
1041 dst->rnr_retry_count = src->rnr_retry_count;
1042 dst->srq = src->srq;
1043 dst->qp_num = src->qp_num & 0xFFFFFF;
1044 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1045}
1046
1047static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1048 int in_len, int out_len)
1049{
1050 struct rdma_conn_param conn_param;
1051 struct rdma_ucm_ece ece = {};
1052 struct rdma_ucm_connect cmd;
1053 struct ucma_context *ctx;
1054 size_t in_size;
1055 int ret;
1056
1057 if (in_len < offsetofend(typeof(cmd), reserved))
1058 return -EINVAL;
1059 in_size = min_t(size_t, in_len, sizeof(cmd));
1060 if (copy_from_user(&cmd, inbuf, in_size))
1061 return -EFAULT;
1062
1063 if (!cmd.conn_param.valid)
1064 return -EINVAL;
1065
1066 ctx = ucma_get_ctx_dev(file, cmd.id);
1067 if (IS_ERR(ctx))
1068 return PTR_ERR(ctx);
1069
1070 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1071 if (offsetofend(typeof(cmd), ece) <= in_size) {
1072 ece.vendor_id = cmd.ece.vendor_id;
1073 ece.attr_mod = cmd.ece.attr_mod;
1074 }
1075
1076 mutex_lock(&ctx->mutex);
1077 ret = rdma_connect_ece(ctx->cm_id, &conn_param, &ece);
1078 mutex_unlock(&ctx->mutex);
1079 ucma_put_ctx(ctx);
1080 return ret;
1081}
1082
1083static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1084 int in_len, int out_len)
1085{
1086 struct rdma_ucm_listen cmd;
1087 struct ucma_context *ctx;
1088 int ret;
1089
1090 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1091 return -EFAULT;
1092
1093 ctx = ucma_get_ctx(file, cmd.id);
1094 if (IS_ERR(ctx))
1095 return PTR_ERR(ctx);
1096
1097 if (cmd.backlog <= 0 || cmd.backlog > max_backlog)
1098 cmd.backlog = max_backlog;
1099 atomic_set(&ctx->backlog, cmd.backlog);
1100
1101 mutex_lock(&ctx->mutex);
1102 ret = rdma_listen(ctx->cm_id, cmd.backlog);
1103 mutex_unlock(&ctx->mutex);
1104 ucma_put_ctx(ctx);
1105 return ret;
1106}
1107
1108static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1109 int in_len, int out_len)
1110{
1111 struct rdma_ucm_accept cmd;
1112 struct rdma_conn_param conn_param;
1113 struct rdma_ucm_ece ece = {};
1114 struct ucma_context *ctx;
1115 size_t in_size;
1116 int ret;
1117
1118 if (in_len < offsetofend(typeof(cmd), reserved))
1119 return -EINVAL;
1120 in_size = min_t(size_t, in_len, sizeof(cmd));
1121 if (copy_from_user(&cmd, inbuf, in_size))
1122 return -EFAULT;
1123
1124 ctx = ucma_get_ctx_dev(file, cmd.id);
1125 if (IS_ERR(ctx))
1126 return PTR_ERR(ctx);
1127
1128 if (offsetofend(typeof(cmd), ece) <= in_size) {
1129 ece.vendor_id = cmd.ece.vendor_id;
1130 ece.attr_mod = cmd.ece.attr_mod;
1131 }
1132
1133 if (cmd.conn_param.valid) {
1134 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1135 mutex_lock(&ctx->mutex);
1136 rdma_lock_handler(ctx->cm_id);
1137 ret = rdma_accept_ece(ctx->cm_id, &conn_param, &ece);
1138 if (!ret) {
1139 /* The uid must be set atomically with the handler */
1140 ctx->uid = cmd.uid;
1141 }
1142 rdma_unlock_handler(ctx->cm_id);
1143 mutex_unlock(&ctx->mutex);
1144 } else {
1145 mutex_lock(&ctx->mutex);
1146 rdma_lock_handler(ctx->cm_id);
1147 ret = rdma_accept_ece(ctx->cm_id, NULL, &ece);
1148 rdma_unlock_handler(ctx->cm_id);
1149 mutex_unlock(&ctx->mutex);
1150 }
1151 ucma_put_ctx(ctx);
1152 return ret;
1153}
1154
1155static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1156 int in_len, int out_len)
1157{
1158 struct rdma_ucm_reject cmd;
1159 struct ucma_context *ctx;
1160 int ret;
1161
1162 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1163 return -EFAULT;
1164
1165 if (!cmd.reason)
1166 cmd.reason = IB_CM_REJ_CONSUMER_DEFINED;
1167
1168 switch (cmd.reason) {
1169 case IB_CM_REJ_CONSUMER_DEFINED:
1170 case IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED:
1171 break;
1172 default:
1173 return -EINVAL;
1174 }
1175
1176 ctx = ucma_get_ctx_dev(file, cmd.id);
1177 if (IS_ERR(ctx))
1178 return PTR_ERR(ctx);
1179
1180 mutex_lock(&ctx->mutex);
1181 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len,
1182 cmd.reason);
1183 mutex_unlock(&ctx->mutex);
1184 ucma_put_ctx(ctx);
1185 return ret;
1186}
1187
1188static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1189 int in_len, int out_len)
1190{
1191 struct rdma_ucm_disconnect cmd;
1192 struct ucma_context *ctx;
1193 int ret;
1194
1195 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1196 return -EFAULT;
1197
1198 ctx = ucma_get_ctx_dev(file, cmd.id);
1199 if (IS_ERR(ctx))
1200 return PTR_ERR(ctx);
1201
1202 mutex_lock(&ctx->mutex);
1203 ret = rdma_disconnect(ctx->cm_id);
1204 mutex_unlock(&ctx->mutex);
1205 ucma_put_ctx(ctx);
1206 return ret;
1207}
1208
1209static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1210 const char __user *inbuf,
1211 int in_len, int out_len)
1212{
1213 struct rdma_ucm_init_qp_attr cmd;
1214 struct ib_uverbs_qp_attr resp;
1215 struct ucma_context *ctx;
1216 struct ib_qp_attr qp_attr;
1217 int ret;
1218
1219 if (out_len < sizeof(resp))
1220 return -ENOSPC;
1221
1222 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1223 return -EFAULT;
1224
1225 if (cmd.qp_state > IB_QPS_ERR)
1226 return -EINVAL;
1227
1228 ctx = ucma_get_ctx_dev(file, cmd.id);
1229 if (IS_ERR(ctx))
1230 return PTR_ERR(ctx);
1231
1232 resp.qp_attr_mask = 0;
1233 memset(&qp_attr, 0, sizeof qp_attr);
1234 qp_attr.qp_state = cmd.qp_state;
1235 mutex_lock(&ctx->mutex);
1236 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1237 mutex_unlock(&ctx->mutex);
1238 if (ret)
1239 goto out;
1240
1241 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
1242 if (copy_to_user(u64_to_user_ptr(cmd.response),
1243 &resp, sizeof(resp)))
1244 ret = -EFAULT;
1245
1246out:
1247 ucma_put_ctx(ctx);
1248 return ret;
1249}
1250
1251static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1252 void *optval, size_t optlen)
1253{
1254 int ret = 0;
1255
1256 switch (optname) {
1257 case RDMA_OPTION_ID_TOS:
1258 if (optlen != sizeof(u8)) {
1259 ret = -EINVAL;
1260 break;
1261 }
1262 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1263 break;
1264 case RDMA_OPTION_ID_REUSEADDR:
1265 if (optlen != sizeof(int)) {
1266 ret = -EINVAL;
1267 break;
1268 }
1269 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1270 break;
1271 case RDMA_OPTION_ID_AFONLY:
1272 if (optlen != sizeof(int)) {
1273 ret = -EINVAL;
1274 break;
1275 }
1276 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1277 break;
1278 case RDMA_OPTION_ID_ACK_TIMEOUT:
1279 if (optlen != sizeof(u8)) {
1280 ret = -EINVAL;
1281 break;
1282 }
1283 ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
1284 break;
1285 default:
1286 ret = -ENOSYS;
1287 }
1288
1289 return ret;
1290}
1291
1292static int ucma_set_ib_path(struct ucma_context *ctx,
1293 struct ib_path_rec_data *path_data, size_t optlen)
1294{
1295 struct sa_path_rec sa_path;
1296 struct rdma_cm_event event;
1297 int ret;
1298
1299 if (optlen % sizeof(*path_data))
1300 return -EINVAL;
1301
1302 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1303 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1304 IB_PATH_BIDIRECTIONAL))
1305 break;
1306 }
1307
1308 if (!optlen)
1309 return -EINVAL;
1310
1311 if (!ctx->cm_id->device)
1312 return -EINVAL;
1313
1314 memset(&sa_path, 0, sizeof(sa_path));
1315
1316 sa_path.rec_type = SA_PATH_REC_TYPE_IB;
1317 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1318
1319 if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
1320 struct sa_path_rec opa;
1321
1322 sa_convert_path_ib_to_opa(&opa, &sa_path);
1323 mutex_lock(&ctx->mutex);
1324 ret = rdma_set_ib_path(ctx->cm_id, &opa);
1325 mutex_unlock(&ctx->mutex);
1326 } else {
1327 mutex_lock(&ctx->mutex);
1328 ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
1329 mutex_unlock(&ctx->mutex);
1330 }
1331 if (ret)
1332 return ret;
1333
1334 memset(&event, 0, sizeof event);
1335 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1336 return ucma_event_handler(ctx->cm_id, &event);
1337}
1338
1339static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1340 void *optval, size_t optlen)
1341{
1342 int ret;
1343
1344 switch (optname) {
1345 case RDMA_OPTION_IB_PATH:
1346 ret = ucma_set_ib_path(ctx, optval, optlen);
1347 break;
1348 default:
1349 ret = -ENOSYS;
1350 }
1351
1352 return ret;
1353}
1354
1355static int ucma_set_option_level(struct ucma_context *ctx, int level,
1356 int optname, void *optval, size_t optlen)
1357{
1358 int ret;
1359
1360 switch (level) {
1361 case RDMA_OPTION_ID:
1362 mutex_lock(&ctx->mutex);
1363 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1364 mutex_unlock(&ctx->mutex);
1365 break;
1366 case RDMA_OPTION_IB:
1367 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1368 break;
1369 default:
1370 ret = -ENOSYS;
1371 }
1372
1373 return ret;
1374}
1375
1376static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1377 int in_len, int out_len)
1378{
1379 struct rdma_ucm_set_option cmd;
1380 struct ucma_context *ctx;
1381 void *optval;
1382 int ret;
1383
1384 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1385 return -EFAULT;
1386
1387 if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
1388 return -EINVAL;
1389
1390 ctx = ucma_get_ctx(file, cmd.id);
1391 if (IS_ERR(ctx))
1392 return PTR_ERR(ctx);
1393
1394 optval = memdup_user(u64_to_user_ptr(cmd.optval),
1395 cmd.optlen);
1396 if (IS_ERR(optval)) {
1397 ret = PTR_ERR(optval);
1398 goto out;
1399 }
1400
1401 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1402 cmd.optlen);
1403 kfree(optval);
1404
1405out:
1406 ucma_put_ctx(ctx);
1407 return ret;
1408}
1409
1410static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1411 int in_len, int out_len)
1412{
1413 struct rdma_ucm_notify cmd;
1414 struct ucma_context *ctx;
1415 int ret = -EINVAL;
1416
1417 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1418 return -EFAULT;
1419
1420 ctx = ucma_get_ctx(file, cmd.id);
1421 if (IS_ERR(ctx))
1422 return PTR_ERR(ctx);
1423
1424 mutex_lock(&ctx->mutex);
1425 if (ctx->cm_id->device)
1426 ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event);
1427 mutex_unlock(&ctx->mutex);
1428
1429 ucma_put_ctx(ctx);
1430 return ret;
1431}
1432
1433static ssize_t ucma_process_join(struct ucma_file *file,
1434 struct rdma_ucm_join_mcast *cmd, int out_len)
1435{
1436 struct rdma_ucm_create_id_resp resp;
1437 struct ucma_context *ctx;
1438 struct ucma_multicast *mc;
1439 struct sockaddr *addr;
1440 int ret;
1441 u8 join_state;
1442
1443 if (out_len < sizeof(resp))
1444 return -ENOSPC;
1445
1446 addr = (struct sockaddr *) &cmd->addr;
1447 if (cmd->addr_size != rdma_addr_size(addr))
1448 return -EINVAL;
1449
1450 if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
1451 join_state = BIT(FULLMEMBER_JOIN);
1452 else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
1453 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
1454 else
1455 return -EINVAL;
1456
1457 ctx = ucma_get_ctx_dev(file, cmd->id);
1458 if (IS_ERR(ctx))
1459 return PTR_ERR(ctx);
1460
1461 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
1462 if (!mc) {
1463 ret = -ENOMEM;
1464 goto err_put_ctx;
1465 }
1466
1467 mc->ctx = ctx;
1468 mc->join_state = join_state;
1469 mc->uid = cmd->uid;
1470 memcpy(&mc->addr, addr, cmd->addr_size);
1471
1472 if (xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b,
1473 GFP_KERNEL)) {
1474 ret = -ENOMEM;
1475 goto err_free_mc;
1476 }
1477
1478 mutex_lock(&ctx->mutex);
1479 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
1480 join_state, mc);
1481 mutex_unlock(&ctx->mutex);
1482 if (ret)
1483 goto err_xa_erase;
1484
1485 resp.id = mc->id;
1486 if (copy_to_user(u64_to_user_ptr(cmd->response),
1487 &resp, sizeof(resp))) {
1488 ret = -EFAULT;
1489 goto err_leave_multicast;
1490 }
1491
1492 xa_store(&multicast_table, mc->id, mc, 0);
1493
1494 ucma_put_ctx(ctx);
1495 return 0;
1496
1497err_leave_multicast:
1498 mutex_lock(&ctx->mutex);
1499 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1500 mutex_unlock(&ctx->mutex);
1501 ucma_cleanup_mc_events(mc);
1502err_xa_erase:
1503 xa_erase(&multicast_table, mc->id);
1504err_free_mc:
1505 kfree(mc);
1506err_put_ctx:
1507 ucma_put_ctx(ctx);
1508 return ret;
1509}
1510
1511static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1512 const char __user *inbuf,
1513 int in_len, int out_len)
1514{
1515 struct rdma_ucm_join_ip_mcast cmd;
1516 struct rdma_ucm_join_mcast join_cmd;
1517
1518 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1519 return -EFAULT;
1520
1521 join_cmd.response = cmd.response;
1522 join_cmd.uid = cmd.uid;
1523 join_cmd.id = cmd.id;
1524 join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
1525 if (!join_cmd.addr_size)
1526 return -EINVAL;
1527
1528 join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
1529 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1530
1531 return ucma_process_join(file, &join_cmd, out_len);
1532}
1533
1534static ssize_t ucma_join_multicast(struct ucma_file *file,
1535 const char __user *inbuf,
1536 int in_len, int out_len)
1537{
1538 struct rdma_ucm_join_mcast cmd;
1539
1540 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1541 return -EFAULT;
1542
1543 if (!rdma_addr_size_kss(&cmd.addr))
1544 return -EINVAL;
1545
1546 return ucma_process_join(file, &cmd, out_len);
1547}
1548
1549static ssize_t ucma_leave_multicast(struct ucma_file *file,
1550 const char __user *inbuf,
1551 int in_len, int out_len)
1552{
1553 struct rdma_ucm_destroy_id cmd;
1554 struct rdma_ucm_destroy_id_resp resp;
1555 struct ucma_multicast *mc;
1556 int ret = 0;
1557
1558 if (out_len < sizeof(resp))
1559 return -ENOSPC;
1560
1561 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1562 return -EFAULT;
1563
1564 xa_lock(&multicast_table);
1565 mc = xa_load(&multicast_table, cmd.id);
1566 if (!mc)
1567 mc = ERR_PTR(-ENOENT);
1568 else if (READ_ONCE(mc->ctx->file) != file)
1569 mc = ERR_PTR(-EINVAL);
1570 else if (!refcount_inc_not_zero(&mc->ctx->ref))
1571 mc = ERR_PTR(-ENXIO);
1572 else
1573 __xa_erase(&multicast_table, mc->id);
1574 xa_unlock(&multicast_table);
1575
1576 if (IS_ERR(mc)) {
1577 ret = PTR_ERR(mc);
1578 goto out;
1579 }
1580
1581 mutex_lock(&mc->ctx->mutex);
1582 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1583 mutex_unlock(&mc->ctx->mutex);
1584
1585 ucma_cleanup_mc_events(mc);
1586
1587 ucma_put_ctx(mc->ctx);
1588 resp.events_reported = mc->events_reported;
1589 kfree(mc);
1590
1591 if (copy_to_user(u64_to_user_ptr(cmd.response),
1592 &resp, sizeof(resp)))
1593 ret = -EFAULT;
1594out:
1595 return ret;
1596}
1597
1598static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1599 const char __user *inbuf,
1600 int in_len, int out_len)
1601{
1602 struct rdma_ucm_migrate_id cmd;
1603 struct rdma_ucm_migrate_resp resp;
1604 struct ucma_event *uevent, *tmp;
1605 struct ucma_context *ctx;
1606 LIST_HEAD(event_list);
1607 struct fd f;
1608 struct ucma_file *cur_file;
1609 int ret = 0;
1610
1611 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1612 return -EFAULT;
1613
1614 /* Get current fd to protect against it being closed */
1615 f = fdget(cmd.fd);
1616 if (!f.file)
1617 return -ENOENT;
1618 if (f.file->f_op != &ucma_fops) {
1619 ret = -EINVAL;
1620 goto file_put;
1621 }
1622 cur_file = f.file->private_data;
1623
1624 /* Validate current fd and prevent destruction of id. */
1625 ctx = ucma_get_ctx(cur_file, cmd.id);
1626 if (IS_ERR(ctx)) {
1627 ret = PTR_ERR(ctx);
1628 goto file_put;
1629 }
1630
1631 rdma_lock_handler(ctx->cm_id);
1632 /*
1633 * ctx->file can only be changed under the handler & xa_lock. xa_load()
1634 * must be checked again to ensure the ctx hasn't begun destruction
1635 * since the ucma_get_ctx().
1636 */
1637 xa_lock(&ctx_table);
1638 if (_ucma_find_context(cmd.id, cur_file) != ctx) {
1639 xa_unlock(&ctx_table);
1640 ret = -ENOENT;
1641 goto err_unlock;
1642 }
1643 ctx->file = new_file;
1644 xa_unlock(&ctx_table);
1645
1646 mutex_lock(&cur_file->mut);
1647 list_del(&ctx->list);
1648 /*
1649 * At this point lock_handler() prevents addition of new uevents for
1650 * this ctx.
1651 */
1652 list_for_each_entry_safe(uevent, tmp, &cur_file->event_list, list)
1653 if (uevent->ctx == ctx)
1654 list_move_tail(&uevent->list, &event_list);
1655 resp.events_reported = ctx->events_reported;
1656 mutex_unlock(&cur_file->mut);
1657
1658 mutex_lock(&new_file->mut);
1659 list_add_tail(&ctx->list, &new_file->ctx_list);
1660 list_splice_tail(&event_list, &new_file->event_list);
1661 mutex_unlock(&new_file->mut);
1662
1663 if (copy_to_user(u64_to_user_ptr(cmd.response),
1664 &resp, sizeof(resp)))
1665 ret = -EFAULT;
1666
1667err_unlock:
1668 rdma_unlock_handler(ctx->cm_id);
1669 ucma_put_ctx(ctx);
1670file_put:
1671 fdput(f);
1672 return ret;
1673}
1674
1675static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1676 const char __user *inbuf,
1677 int in_len, int out_len) = {
1678 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1679 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1680 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1681 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1682 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1683 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1684 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1685 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1686 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1687 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1688 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1689 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1690 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1691 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1692 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1693 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1694 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1695 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1696 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1697 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1698 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1699 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1700 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1701};
1702
1703static ssize_t ucma_write(struct file *filp, const char __user *buf,
1704 size_t len, loff_t *pos)
1705{
1706 struct ucma_file *file = filp->private_data;
1707 struct rdma_ucm_cmd_hdr hdr;
1708 ssize_t ret;
1709
1710 if (!ib_safe_file_access(filp)) {
1711 pr_err_once("%s: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1712 __func__, task_tgid_vnr(current), current->comm);
1713 return -EACCES;
1714 }
1715
1716 if (len < sizeof(hdr))
1717 return -EINVAL;
1718
1719 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1720 return -EFAULT;
1721
1722 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1723 return -EINVAL;
1724 hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table));
1725
1726 if (hdr.in + sizeof(hdr) > len)
1727 return -EINVAL;
1728
1729 if (!ucma_cmd_table[hdr.cmd])
1730 return -ENOSYS;
1731
1732 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1733 if (!ret)
1734 ret = len;
1735
1736 return ret;
1737}
1738
1739static __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait)
1740{
1741 struct ucma_file *file = filp->private_data;
1742 __poll_t mask = 0;
1743
1744 poll_wait(filp, &file->poll_wait, wait);
1745
1746 if (!list_empty(&file->event_list))
1747 mask = EPOLLIN | EPOLLRDNORM;
1748
1749 return mask;
1750}
1751
1752/*
1753 * ucma_open() does not need the BKL:
1754 *
1755 * - no global state is referred to;
1756 * - there is no ioctl method to race against;
1757 * - no further module initialization is required for open to work
1758 * after the device is registered.
1759 */
1760static int ucma_open(struct inode *inode, struct file *filp)
1761{
1762 struct ucma_file *file;
1763
1764 file = kmalloc(sizeof *file, GFP_KERNEL);
1765 if (!file)
1766 return -ENOMEM;
1767
1768 INIT_LIST_HEAD(&file->event_list);
1769 INIT_LIST_HEAD(&file->ctx_list);
1770 init_waitqueue_head(&file->poll_wait);
1771 mutex_init(&file->mut);
1772
1773 filp->private_data = file;
1774 file->filp = filp;
1775
1776 return stream_open(inode, filp);
1777}
1778
1779static int ucma_close(struct inode *inode, struct file *filp)
1780{
1781 struct ucma_file *file = filp->private_data;
1782
1783 /*
1784 * All paths that touch ctx_list or ctx_list starting from write() are
1785 * prevented by this being a FD release function. The list_add_tail() in
1786 * ucma_connect_event_handler() can run concurrently, however it only
1787 * adds to the list *after* a listening ID. By only reading the first of
1788 * the list, and relying on ucma_destroy_private_ctx() to block
1789 * ucma_connect_event_handler(), no additional locking is needed.
1790 */
1791 while (!list_empty(&file->ctx_list)) {
1792 struct ucma_context *ctx = list_first_entry(
1793 &file->ctx_list, struct ucma_context, list);
1794
1795 WARN_ON(xa_cmpxchg(&ctx_table, ctx->id, ctx, XA_ZERO_ENTRY,
1796 GFP_KERNEL) != ctx);
1797 ucma_destroy_private_ctx(ctx);
1798 }
1799 kfree(file);
1800 return 0;
1801}
1802
1803static const struct file_operations ucma_fops = {
1804 .owner = THIS_MODULE,
1805 .open = ucma_open,
1806 .release = ucma_close,
1807 .write = ucma_write,
1808 .poll = ucma_poll,
1809 .llseek = no_llseek,
1810};
1811
1812static struct miscdevice ucma_misc = {
1813 .minor = MISC_DYNAMIC_MINOR,
1814 .name = "rdma_cm",
1815 .nodename = "infiniband/rdma_cm",
1816 .mode = 0666,
1817 .fops = &ucma_fops,
1818};
1819
1820static int ucma_get_global_nl_info(struct ib_client_nl_info *res)
1821{
1822 res->abi = RDMA_USER_CM_ABI_VERSION;
1823 res->cdev = ucma_misc.this_device;
1824 return 0;
1825}
1826
1827static struct ib_client rdma_cma_client = {
1828 .name = "rdma_cm",
1829 .get_global_nl_info = ucma_get_global_nl_info,
1830};
1831MODULE_ALIAS_RDMA_CLIENT("rdma_cm");
1832
1833static ssize_t abi_version_show(struct device *dev,
1834 struct device_attribute *attr, char *buf)
1835{
1836 return sysfs_emit(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1837}
1838static DEVICE_ATTR_RO(abi_version);
1839
1840static int __init ucma_init(void)
1841{
1842 int ret;
1843
1844 ret = misc_register(&ucma_misc);
1845 if (ret)
1846 return ret;
1847
1848 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1849 if (ret) {
1850 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1851 goto err1;
1852 }
1853
1854 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1855 if (!ucma_ctl_table_hdr) {
1856 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1857 ret = -ENOMEM;
1858 goto err2;
1859 }
1860
1861 ret = ib_register_client(&rdma_cma_client);
1862 if (ret)
1863 goto err3;
1864
1865 return 0;
1866err3:
1867 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1868err2:
1869 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1870err1:
1871 misc_deregister(&ucma_misc);
1872 return ret;
1873}
1874
1875static void __exit ucma_cleanup(void)
1876{
1877 ib_unregister_client(&rdma_cma_client);
1878 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1879 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1880 misc_deregister(&ucma_misc);
1881}
1882
1883module_init(ucma_init);
1884module_exit(ucma_cleanup);