1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
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/rdma_netlink.h>
56#include "core_priv.h"
57
58MODULE_AUTHOR("Sean Hefty");
59MODULE_DESCRIPTION("RDMA Userspace Connection Manager Access");
60MODULE_LICENSE("Dual BSD/GPL");
61
62static unsigned int max_backlog = 1024;
63
64static struct ctl_table_header *ucma_ctl_table_hdr;
65static struct ctl_table ucma_ctl_table[] = {
66 {
67 .procname = "max_backlog",
68 .data = &max_backlog,
69 .maxlen = sizeof max_backlog,
70 .mode = 0644,
71 .proc_handler = proc_dointvec,
72 },
73 { }
74};
75
76struct ucma_file {
77 struct mutex mut;
78 struct file *filp;
79 struct list_head ctx_list;
80 struct list_head event_list;
81 wait_queue_head_t poll_wait;
82 struct workqueue_struct *close_wq;
83};
84
85struct ucma_context {
86 u32 id;
87 struct completion comp;
88 atomic_t ref;
89 int events_reported;
90 int backlog;
91
92 struct ucma_file *file;
93 struct rdma_cm_id *cm_id;
94 u64 uid;
95
96 struct list_head list;
97 struct list_head mc_list;
98
99
100
101 int closing;
102
103 int destroying;
104 struct work_struct close_work;
105};
106
107struct ucma_multicast {
108 struct ucma_context *ctx;
109 u32 id;
110 int events_reported;
111
112 u64 uid;
113 u8 join_state;
114 struct list_head list;
115 struct sockaddr_storage addr;
116};
117
118struct ucma_event {
119 struct ucma_context *ctx;
120 struct ucma_multicast *mc;
121 struct list_head list;
122 struct rdma_cm_id *cm_id;
123 struct rdma_ucm_event_resp resp;
124 struct work_struct close_work;
125};
126
127static DEFINE_XARRAY_ALLOC(ctx_table);
128static DEFINE_XARRAY_ALLOC(multicast_table);
129
130static const struct file_operations ucma_fops;
131
132static inline struct ucma_context *_ucma_find_context(int id,
133 struct ucma_file *file)
134{
135 struct ucma_context *ctx;
136
137 ctx = xa_load(&ctx_table, id);
138 if (!ctx)
139 ctx = ERR_PTR(-ENOENT);
140 else if (ctx->file != file || !ctx->cm_id)
141 ctx = ERR_PTR(-EINVAL);
142 return ctx;
143}
144
145static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
146{
147 struct ucma_context *ctx;
148
149 xa_lock(&ctx_table);
150 ctx = _ucma_find_context(id, file);
151 if (!IS_ERR(ctx)) {
152 if (ctx->closing)
153 ctx = ERR_PTR(-EIO);
154 else
155 atomic_inc(&ctx->ref);
156 }
157 xa_unlock(&ctx_table);
158 return ctx;
159}
160
161static void ucma_put_ctx(struct ucma_context *ctx)
162{
163 if (atomic_dec_and_test(&ctx->ref))
164 complete(&ctx->comp);
165}
166
167
168
169
170
171static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
172{
173 struct ucma_context *ctx = ucma_get_ctx(file, id);
174
175 if (IS_ERR(ctx))
176 return ctx;
177 if (!ctx->cm_id->device) {
178 ucma_put_ctx(ctx);
179 return ERR_PTR(-EINVAL);
180 }
181 return ctx;
182}
183
184static void ucma_close_event_id(struct work_struct *work)
185{
186 struct ucma_event *uevent_close = container_of(work, struct ucma_event, close_work);
187
188 rdma_destroy_id(uevent_close->cm_id);
189 kfree(uevent_close);
190}
191
192static void ucma_close_id(struct work_struct *work)
193{
194 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
195
196
197
198
199
200 ucma_put_ctx(ctx);
201 wait_for_completion(&ctx->comp);
202
203 rdma_destroy_id(ctx->cm_id);
204}
205
206static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
207{
208 struct ucma_context *ctx;
209
210 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
211 if (!ctx)
212 return NULL;
213
214 INIT_WORK(&ctx->close_work, ucma_close_id);
215 atomic_set(&ctx->ref, 1);
216 init_completion(&ctx->comp);
217 INIT_LIST_HEAD(&ctx->mc_list);
218 ctx->file = file;
219
220 if (xa_alloc(&ctx_table, &ctx->id, ctx, xa_limit_32b, GFP_KERNEL))
221 goto error;
222
223 list_add_tail(&ctx->list, &file->ctx_list);
224 return ctx;
225
226error:
227 kfree(ctx);
228 return NULL;
229}
230
231static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
232{
233 struct ucma_multicast *mc;
234
235 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
236 if (!mc)
237 return NULL;
238
239 mc->ctx = ctx;
240 if (xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b, GFP_KERNEL))
241 goto error;
242
243 list_add_tail(&mc->list, &ctx->mc_list);
244 return mc;
245
246error:
247 kfree(mc);
248 return NULL;
249}
250
251static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
252 struct rdma_conn_param *src)
253{
254 if (src->private_data_len)
255 memcpy(dst->private_data, src->private_data,
256 src->private_data_len);
257 dst->private_data_len = src->private_data_len;
258 dst->responder_resources =src->responder_resources;
259 dst->initiator_depth = src->initiator_depth;
260 dst->flow_control = src->flow_control;
261 dst->retry_count = src->retry_count;
262 dst->rnr_retry_count = src->rnr_retry_count;
263 dst->srq = src->srq;
264 dst->qp_num = src->qp_num;
265}
266
267static void ucma_copy_ud_event(struct ib_device *device,
268 struct rdma_ucm_ud_param *dst,
269 struct rdma_ud_param *src)
270{
271 if (src->private_data_len)
272 memcpy(dst->private_data, src->private_data,
273 src->private_data_len);
274 dst->private_data_len = src->private_data_len;
275 ib_copy_ah_attr_to_user(device, &dst->ah_attr, &src->ah_attr);
276 dst->qp_num = src->qp_num;
277 dst->qkey = src->qkey;
278}
279
280static void ucma_set_event_context(struct ucma_context *ctx,
281 struct rdma_cm_event *event,
282 struct ucma_event *uevent)
283{
284 uevent->ctx = ctx;
285 switch (event->event) {
286 case RDMA_CM_EVENT_MULTICAST_JOIN:
287 case RDMA_CM_EVENT_MULTICAST_ERROR:
288 uevent->mc = (struct ucma_multicast *)
289 event->param.ud.private_data;
290 uevent->resp.uid = uevent->mc->uid;
291 uevent->resp.id = uevent->mc->id;
292 break;
293 default:
294 uevent->resp.uid = ctx->uid;
295 uevent->resp.id = ctx->id;
296 break;
297 }
298}
299
300
301static void ucma_removal_event_handler(struct rdma_cm_id *cm_id)
302{
303 struct ucma_context *ctx = cm_id->context;
304 struct ucma_event *con_req_eve;
305 int event_found = 0;
306
307 if (ctx->destroying)
308 return;
309
310
311
312
313
314
315
316 if (ctx->cm_id == cm_id) {
317 xa_lock(&ctx_table);
318 ctx->closing = 1;
319 xa_unlock(&ctx_table);
320 queue_work(ctx->file->close_wq, &ctx->close_work);
321 return;
322 }
323
324 list_for_each_entry(con_req_eve, &ctx->file->event_list, list) {
325 if (con_req_eve->cm_id == cm_id &&
326 con_req_eve->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
327 list_del(&con_req_eve->list);
328 INIT_WORK(&con_req_eve->close_work, ucma_close_event_id);
329 queue_work(ctx->file->close_wq, &con_req_eve->close_work);
330 event_found = 1;
331 break;
332 }
333 }
334 if (!event_found)
335 pr_err("ucma_removal_event_handler: warning: connect request event wasn't found\n");
336}
337
338static int ucma_event_handler(struct rdma_cm_id *cm_id,
339 struct rdma_cm_event *event)
340{
341 struct ucma_event *uevent;
342 struct ucma_context *ctx = cm_id->context;
343 int ret = 0;
344
345 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
346 if (!uevent)
347 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
348
349 mutex_lock(&ctx->file->mut);
350 uevent->cm_id = cm_id;
351 ucma_set_event_context(ctx, event, uevent);
352 uevent->resp.event = event->event;
353 uevent->resp.status = event->status;
354 if (cm_id->qp_type == IB_QPT_UD)
355 ucma_copy_ud_event(cm_id->device, &uevent->resp.param.ud,
356 &event->param.ud);
357 else
358 ucma_copy_conn_event(&uevent->resp.param.conn,
359 &event->param.conn);
360
361 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
362 if (!ctx->backlog) {
363 ret = -ENOMEM;
364 kfree(uevent);
365 goto out;
366 }
367 ctx->backlog--;
368 } else if (!ctx->uid || ctx->cm_id != cm_id) {
369
370
371
372
373
374
375
376
377 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
378 ucma_removal_event_handler(cm_id);
379
380 kfree(uevent);
381 goto out;
382 }
383
384 list_add_tail(&uevent->list, &ctx->file->event_list);
385 wake_up_interruptible(&ctx->file->poll_wait);
386 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
387 ucma_removal_event_handler(cm_id);
388out:
389 mutex_unlock(&ctx->file->mut);
390 return ret;
391}
392
393static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
394 int in_len, int out_len)
395{
396 struct ucma_context *ctx;
397 struct rdma_ucm_get_event cmd;
398 struct ucma_event *uevent;
399 int ret = 0;
400
401
402
403
404
405 if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved))
406 return -ENOSPC;
407
408 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
409 return -EFAULT;
410
411 mutex_lock(&file->mut);
412 while (list_empty(&file->event_list)) {
413 mutex_unlock(&file->mut);
414
415 if (file->filp->f_flags & O_NONBLOCK)
416 return -EAGAIN;
417
418 if (wait_event_interruptible(file->poll_wait,
419 !list_empty(&file->event_list)))
420 return -ERESTARTSYS;
421
422 mutex_lock(&file->mut);
423 }
424
425 uevent = list_entry(file->event_list.next, struct ucma_event, list);
426
427 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
428 ctx = ucma_alloc_ctx(file);
429 if (!ctx) {
430 ret = -ENOMEM;
431 goto done;
432 }
433 uevent->ctx->backlog++;
434 ctx->cm_id = uevent->cm_id;
435 ctx->cm_id->context = ctx;
436 uevent->resp.id = ctx->id;
437 }
438
439 if (copy_to_user(u64_to_user_ptr(cmd.response),
440 &uevent->resp,
441 min_t(size_t, out_len, sizeof(uevent->resp)))) {
442 ret = -EFAULT;
443 goto done;
444 }
445
446 list_del(&uevent->list);
447 uevent->ctx->events_reported++;
448 if (uevent->mc)
449 uevent->mc->events_reported++;
450 kfree(uevent);
451done:
452 mutex_unlock(&file->mut);
453 return ret;
454}
455
456static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
457{
458 switch (cmd->ps) {
459 case RDMA_PS_TCP:
460 *qp_type = IB_QPT_RC;
461 return 0;
462 case RDMA_PS_UDP:
463 case RDMA_PS_IPOIB:
464 *qp_type = IB_QPT_UD;
465 return 0;
466 case RDMA_PS_IB:
467 *qp_type = cmd->qp_type;
468 return 0;
469 default:
470 return -EINVAL;
471 }
472}
473
474static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
475 int in_len, int out_len)
476{
477 struct rdma_ucm_create_id cmd;
478 struct rdma_ucm_create_id_resp resp;
479 struct ucma_context *ctx;
480 struct rdma_cm_id *cm_id;
481 enum ib_qp_type qp_type;
482 int ret;
483
484 if (out_len < sizeof(resp))
485 return -ENOSPC;
486
487 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
488 return -EFAULT;
489
490 ret = ucma_get_qp_type(&cmd, &qp_type);
491 if (ret)
492 return ret;
493
494 mutex_lock(&file->mut);
495 ctx = ucma_alloc_ctx(file);
496 mutex_unlock(&file->mut);
497 if (!ctx)
498 return -ENOMEM;
499
500 ctx->uid = cmd.uid;
501 cm_id = __rdma_create_id(current->nsproxy->net_ns,
502 ucma_event_handler, ctx, cmd.ps, qp_type, NULL);
503 if (IS_ERR(cm_id)) {
504 ret = PTR_ERR(cm_id);
505 goto err1;
506 }
507
508 resp.id = ctx->id;
509 if (copy_to_user(u64_to_user_ptr(cmd.response),
510 &resp, sizeof(resp))) {
511 ret = -EFAULT;
512 goto err2;
513 }
514
515 ctx->cm_id = cm_id;
516 return 0;
517
518err2:
519 rdma_destroy_id(cm_id);
520err1:
521 xa_erase(&ctx_table, ctx->id);
522 mutex_lock(&file->mut);
523 list_del(&ctx->list);
524 mutex_unlock(&file->mut);
525 kfree(ctx);
526 return ret;
527}
528
529static void ucma_cleanup_multicast(struct ucma_context *ctx)
530{
531 struct ucma_multicast *mc, *tmp;
532
533 mutex_lock(&ctx->file->mut);
534 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
535 list_del(&mc->list);
536 xa_erase(&multicast_table, mc->id);
537 kfree(mc);
538 }
539 mutex_unlock(&ctx->file->mut);
540}
541
542static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
543{
544 struct ucma_event *uevent, *tmp;
545
546 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
547 if (uevent->mc != mc)
548 continue;
549
550 list_del(&uevent->list);
551 kfree(uevent);
552 }
553}
554
555
556
557
558
559
560
561
562
563
564
565
566static int ucma_free_ctx(struct ucma_context *ctx)
567{
568 int events_reported;
569 struct ucma_event *uevent, *tmp;
570 LIST_HEAD(list);
571
572
573 ucma_cleanup_multicast(ctx);
574
575
576 mutex_lock(&ctx->file->mut);
577 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
578 if (uevent->ctx == ctx)
579 list_move_tail(&uevent->list, &list);
580 }
581 list_del(&ctx->list);
582 mutex_unlock(&ctx->file->mut);
583
584 list_for_each_entry_safe(uevent, tmp, &list, list) {
585 list_del(&uevent->list);
586 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
587 rdma_destroy_id(uevent->cm_id);
588 kfree(uevent);
589 }
590
591 events_reported = ctx->events_reported;
592 kfree(ctx);
593 return events_reported;
594}
595
596static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
597 int in_len, int out_len)
598{
599 struct rdma_ucm_destroy_id cmd;
600 struct rdma_ucm_destroy_id_resp resp;
601 struct ucma_context *ctx;
602 int ret = 0;
603
604 if (out_len < sizeof(resp))
605 return -ENOSPC;
606
607 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
608 return -EFAULT;
609
610 xa_lock(&ctx_table);
611 ctx = _ucma_find_context(cmd.id, file);
612 if (!IS_ERR(ctx))
613 __xa_erase(&ctx_table, ctx->id);
614 xa_unlock(&ctx_table);
615
616 if (IS_ERR(ctx))
617 return PTR_ERR(ctx);
618
619 mutex_lock(&ctx->file->mut);
620 ctx->destroying = 1;
621 mutex_unlock(&ctx->file->mut);
622
623 flush_workqueue(ctx->file->close_wq);
624
625
626 xa_lock(&ctx_table);
627 if (!ctx->closing) {
628 xa_unlock(&ctx_table);
629 ucma_put_ctx(ctx);
630 wait_for_completion(&ctx->comp);
631 rdma_destroy_id(ctx->cm_id);
632 } else {
633 xa_unlock(&ctx_table);
634 }
635
636 resp.events_reported = ucma_free_ctx(ctx);
637 if (copy_to_user(u64_to_user_ptr(cmd.response),
638 &resp, sizeof(resp)))
639 ret = -EFAULT;
640
641 return ret;
642}
643
644static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
645 int in_len, int out_len)
646{
647 struct rdma_ucm_bind_ip cmd;
648 struct ucma_context *ctx;
649 int ret;
650
651 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
652 return -EFAULT;
653
654 if (!rdma_addr_size_in6(&cmd.addr))
655 return -EINVAL;
656
657 ctx = ucma_get_ctx(file, cmd.id);
658 if (IS_ERR(ctx))
659 return PTR_ERR(ctx);
660
661 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
662 ucma_put_ctx(ctx);
663 return ret;
664}
665
666static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
667 int in_len, int out_len)
668{
669 struct rdma_ucm_bind cmd;
670 struct ucma_context *ctx;
671 int ret;
672
673 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
674 return -EFAULT;
675
676 if (cmd.reserved || !cmd.addr_size ||
677 cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
678 return -EINVAL;
679
680 ctx = ucma_get_ctx(file, cmd.id);
681 if (IS_ERR(ctx))
682 return PTR_ERR(ctx);
683
684 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
685 ucma_put_ctx(ctx);
686 return ret;
687}
688
689static ssize_t ucma_resolve_ip(struct ucma_file *file,
690 const char __user *inbuf,
691 int in_len, int out_len)
692{
693 struct rdma_ucm_resolve_ip cmd;
694 struct ucma_context *ctx;
695 int ret;
696
697 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
698 return -EFAULT;
699
700 if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
701 !rdma_addr_size_in6(&cmd.dst_addr))
702 return -EINVAL;
703
704 ctx = ucma_get_ctx(file, cmd.id);
705 if (IS_ERR(ctx))
706 return PTR_ERR(ctx);
707
708 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
709 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
710 ucma_put_ctx(ctx);
711 return ret;
712}
713
714static ssize_t ucma_resolve_addr(struct ucma_file *file,
715 const char __user *inbuf,
716 int in_len, int out_len)
717{
718 struct rdma_ucm_resolve_addr cmd;
719 struct ucma_context *ctx;
720 int ret;
721
722 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
723 return -EFAULT;
724
725 if (cmd.reserved ||
726 (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
727 !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
728 return -EINVAL;
729
730 ctx = ucma_get_ctx(file, cmd.id);
731 if (IS_ERR(ctx))
732 return PTR_ERR(ctx);
733
734 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
735 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
736 ucma_put_ctx(ctx);
737 return ret;
738}
739
740static ssize_t ucma_resolve_route(struct ucma_file *file,
741 const char __user *inbuf,
742 int in_len, int out_len)
743{
744 struct rdma_ucm_resolve_route cmd;
745 struct ucma_context *ctx;
746 int ret;
747
748 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
749 return -EFAULT;
750
751 ctx = ucma_get_ctx_dev(file, cmd.id);
752 if (IS_ERR(ctx))
753 return PTR_ERR(ctx);
754
755 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
756 ucma_put_ctx(ctx);
757 return ret;
758}
759
760static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
761 struct rdma_route *route)
762{
763 struct rdma_dev_addr *dev_addr;
764
765 resp->num_paths = route->num_paths;
766 switch (route->num_paths) {
767 case 0:
768 dev_addr = &route->addr.dev_addr;
769 rdma_addr_get_dgid(dev_addr,
770 (union ib_gid *) &resp->ib_route[0].dgid);
771 rdma_addr_get_sgid(dev_addr,
772 (union ib_gid *) &resp->ib_route[0].sgid);
773 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
774 break;
775 case 2:
776 ib_copy_path_rec_to_user(&resp->ib_route[1],
777 &route->path_rec[1]);
778
779 case 1:
780 ib_copy_path_rec_to_user(&resp->ib_route[0],
781 &route->path_rec[0]);
782 break;
783 default:
784 break;
785 }
786}
787
788static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
789 struct rdma_route *route)
790{
791
792 resp->num_paths = route->num_paths;
793 switch (route->num_paths) {
794 case 0:
795 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
796 (union ib_gid *)&resp->ib_route[0].dgid);
797 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
798 (union ib_gid *)&resp->ib_route[0].sgid);
799 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
800 break;
801 case 2:
802 ib_copy_path_rec_to_user(&resp->ib_route[1],
803 &route->path_rec[1]);
804
805 case 1:
806 ib_copy_path_rec_to_user(&resp->ib_route[0],
807 &route->path_rec[0]);
808 break;
809 default:
810 break;
811 }
812}
813
814static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
815 struct rdma_route *route)
816{
817 struct rdma_dev_addr *dev_addr;
818
819 dev_addr = &route->addr.dev_addr;
820 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
821 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
822}
823
824static ssize_t ucma_query_route(struct ucma_file *file,
825 const char __user *inbuf,
826 int in_len, int out_len)
827{
828 struct rdma_ucm_query cmd;
829 struct rdma_ucm_query_route_resp resp;
830 struct ucma_context *ctx;
831 struct sockaddr *addr;
832 int ret = 0;
833
834 if (out_len < sizeof(resp))
835 return -ENOSPC;
836
837 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
838 return -EFAULT;
839
840 ctx = ucma_get_ctx(file, cmd.id);
841 if (IS_ERR(ctx))
842 return PTR_ERR(ctx);
843
844 memset(&resp, 0, sizeof resp);
845 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
846 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
847 sizeof(struct sockaddr_in) :
848 sizeof(struct sockaddr_in6));
849 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
850 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
851 sizeof(struct sockaddr_in) :
852 sizeof(struct sockaddr_in6));
853 if (!ctx->cm_id->device)
854 goto out;
855
856 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
857 resp.port_num = ctx->cm_id->port_num;
858
859 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
860 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
861 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
862 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
863 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
864 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
865
866out:
867 if (copy_to_user(u64_to_user_ptr(cmd.response),
868 &resp, sizeof(resp)))
869 ret = -EFAULT;
870
871 ucma_put_ctx(ctx);
872 return ret;
873}
874
875static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
876 struct rdma_ucm_query_addr_resp *resp)
877{
878 if (!cm_id->device)
879 return;
880
881 resp->node_guid = (__force __u64) cm_id->device->node_guid;
882 resp->port_num = cm_id->port_num;
883 resp->pkey = (__force __u16) cpu_to_be16(
884 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
885}
886
887static ssize_t ucma_query_addr(struct ucma_context *ctx,
888 void __user *response, int out_len)
889{
890 struct rdma_ucm_query_addr_resp resp;
891 struct sockaddr *addr;
892 int ret = 0;
893
894 if (out_len < sizeof(resp))
895 return -ENOSPC;
896
897 memset(&resp, 0, sizeof resp);
898
899 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
900 resp.src_size = rdma_addr_size(addr);
901 memcpy(&resp.src_addr, addr, resp.src_size);
902
903 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
904 resp.dst_size = rdma_addr_size(addr);
905 memcpy(&resp.dst_addr, addr, resp.dst_size);
906
907 ucma_query_device_addr(ctx->cm_id, &resp);
908
909 if (copy_to_user(response, &resp, sizeof(resp)))
910 ret = -EFAULT;
911
912 return ret;
913}
914
915static ssize_t ucma_query_path(struct ucma_context *ctx,
916 void __user *response, int out_len)
917{
918 struct rdma_ucm_query_path_resp *resp;
919 int i, ret = 0;
920
921 if (out_len < sizeof(*resp))
922 return -ENOSPC;
923
924 resp = kzalloc(out_len, GFP_KERNEL);
925 if (!resp)
926 return -ENOMEM;
927
928 resp->num_paths = ctx->cm_id->route.num_paths;
929 for (i = 0, out_len -= sizeof(*resp);
930 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
931 i++, out_len -= sizeof(struct ib_path_rec_data)) {
932 struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
933
934 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
935 IB_PATH_BIDIRECTIONAL;
936 if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
937 struct sa_path_rec ib;
938
939 sa_convert_path_opa_to_ib(&ib, rec);
940 ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
941
942 } else {
943 ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
944 }
945 }
946
947 if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
948 ret = -EFAULT;
949
950 kfree(resp);
951 return ret;
952}
953
954static ssize_t ucma_query_gid(struct ucma_context *ctx,
955 void __user *response, int out_len)
956{
957 struct rdma_ucm_query_addr_resp resp;
958 struct sockaddr_ib *addr;
959 int ret = 0;
960
961 if (out_len < sizeof(resp))
962 return -ENOSPC;
963
964 memset(&resp, 0, sizeof resp);
965
966 ucma_query_device_addr(ctx->cm_id, &resp);
967
968 addr = (struct sockaddr_ib *) &resp.src_addr;
969 resp.src_size = sizeof(*addr);
970 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
971 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
972 } else {
973 addr->sib_family = AF_IB;
974 addr->sib_pkey = (__force __be16) resp.pkey;
975 rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr,
976 NULL);
977 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
978 &ctx->cm_id->route.addr.src_addr);
979 }
980
981 addr = (struct sockaddr_ib *) &resp.dst_addr;
982 resp.dst_size = sizeof(*addr);
983 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
984 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
985 } else {
986 addr->sib_family = AF_IB;
987 addr->sib_pkey = (__force __be16) resp.pkey;
988 rdma_read_gids(ctx->cm_id, NULL,
989 (union ib_gid *)&addr->sib_addr);
990 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
991 &ctx->cm_id->route.addr.dst_addr);
992 }
993
994 if (copy_to_user(response, &resp, sizeof(resp)))
995 ret = -EFAULT;
996
997 return ret;
998}
999
1000static ssize_t ucma_query(struct ucma_file *file,
1001 const char __user *inbuf,
1002 int in_len, int out_len)
1003{
1004 struct rdma_ucm_query cmd;
1005 struct ucma_context *ctx;
1006 void __user *response;
1007 int ret;
1008
1009 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1010 return -EFAULT;
1011
1012 response = u64_to_user_ptr(cmd.response);
1013 ctx = ucma_get_ctx(file, cmd.id);
1014 if (IS_ERR(ctx))
1015 return PTR_ERR(ctx);
1016
1017 switch (cmd.option) {
1018 case RDMA_USER_CM_QUERY_ADDR:
1019 ret = ucma_query_addr(ctx, response, out_len);
1020 break;
1021 case RDMA_USER_CM_QUERY_PATH:
1022 ret = ucma_query_path(ctx, response, out_len);
1023 break;
1024 case RDMA_USER_CM_QUERY_GID:
1025 ret = ucma_query_gid(ctx, response, out_len);
1026 break;
1027 default:
1028 ret = -ENOSYS;
1029 break;
1030 }
1031
1032 ucma_put_ctx(ctx);
1033 return ret;
1034}
1035
1036static void ucma_copy_conn_param(struct rdma_cm_id *id,
1037 struct rdma_conn_param *dst,
1038 struct rdma_ucm_conn_param *src)
1039{
1040 dst->private_data = src->private_data;
1041 dst->private_data_len = src->private_data_len;
1042 dst->responder_resources =src->responder_resources;
1043 dst->initiator_depth = src->initiator_depth;
1044 dst->flow_control = src->flow_control;
1045 dst->retry_count = src->retry_count;
1046 dst->rnr_retry_count = src->rnr_retry_count;
1047 dst->srq = src->srq;
1048 dst->qp_num = src->qp_num;
1049 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1050}
1051
1052static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1053 int in_len, int out_len)
1054{
1055 struct rdma_ucm_connect cmd;
1056 struct rdma_conn_param conn_param;
1057 struct ucma_context *ctx;
1058 int ret;
1059
1060 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
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 ret = rdma_connect(ctx->cm_id, &conn_param);
1072 ucma_put_ctx(ctx);
1073 return ret;
1074}
1075
1076static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1077 int in_len, int out_len)
1078{
1079 struct rdma_ucm_listen cmd;
1080 struct ucma_context *ctx;
1081 int ret;
1082
1083 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1084 return -EFAULT;
1085
1086 ctx = ucma_get_ctx(file, cmd.id);
1087 if (IS_ERR(ctx))
1088 return PTR_ERR(ctx);
1089
1090 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
1091 cmd.backlog : max_backlog;
1092 ret = rdma_listen(ctx->cm_id, ctx->backlog);
1093 ucma_put_ctx(ctx);
1094 return ret;
1095}
1096
1097static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1098 int in_len, int out_len)
1099{
1100 struct rdma_ucm_accept cmd;
1101 struct rdma_conn_param conn_param;
1102 struct ucma_context *ctx;
1103 int ret;
1104
1105 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1106 return -EFAULT;
1107
1108 ctx = ucma_get_ctx_dev(file, cmd.id);
1109 if (IS_ERR(ctx))
1110 return PTR_ERR(ctx);
1111
1112 if (cmd.conn_param.valid) {
1113 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1114 mutex_lock(&file->mut);
1115 ret = __rdma_accept(ctx->cm_id, &conn_param, NULL);
1116 if (!ret)
1117 ctx->uid = cmd.uid;
1118 mutex_unlock(&file->mut);
1119 } else
1120 ret = __rdma_accept(ctx->cm_id, NULL, NULL);
1121
1122 ucma_put_ctx(ctx);
1123 return ret;
1124}
1125
1126static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1127 int in_len, int out_len)
1128{
1129 struct rdma_ucm_reject cmd;
1130 struct ucma_context *ctx;
1131 int ret;
1132
1133 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1134 return -EFAULT;
1135
1136 ctx = ucma_get_ctx_dev(file, cmd.id);
1137 if (IS_ERR(ctx))
1138 return PTR_ERR(ctx);
1139
1140 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len);
1141 ucma_put_ctx(ctx);
1142 return ret;
1143}
1144
1145static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1146 int in_len, int out_len)
1147{
1148 struct rdma_ucm_disconnect cmd;
1149 struct ucma_context *ctx;
1150 int ret;
1151
1152 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1153 return -EFAULT;
1154
1155 ctx = ucma_get_ctx_dev(file, cmd.id);
1156 if (IS_ERR(ctx))
1157 return PTR_ERR(ctx);
1158
1159 ret = rdma_disconnect(ctx->cm_id);
1160 ucma_put_ctx(ctx);
1161 return ret;
1162}
1163
1164static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1165 const char __user *inbuf,
1166 int in_len, int out_len)
1167{
1168 struct rdma_ucm_init_qp_attr cmd;
1169 struct ib_uverbs_qp_attr resp;
1170 struct ucma_context *ctx;
1171 struct ib_qp_attr qp_attr;
1172 int ret;
1173
1174 if (out_len < sizeof(resp))
1175 return -ENOSPC;
1176
1177 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1178 return -EFAULT;
1179
1180 if (cmd.qp_state > IB_QPS_ERR)
1181 return -EINVAL;
1182
1183 ctx = ucma_get_ctx_dev(file, cmd.id);
1184 if (IS_ERR(ctx))
1185 return PTR_ERR(ctx);
1186
1187 resp.qp_attr_mask = 0;
1188 memset(&qp_attr, 0, sizeof qp_attr);
1189 qp_attr.qp_state = cmd.qp_state;
1190 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1191 if (ret)
1192 goto out;
1193
1194 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
1195 if (copy_to_user(u64_to_user_ptr(cmd.response),
1196 &resp, sizeof(resp)))
1197 ret = -EFAULT;
1198
1199out:
1200 ucma_put_ctx(ctx);
1201 return ret;
1202}
1203
1204static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1205 void *optval, size_t optlen)
1206{
1207 int ret = 0;
1208
1209 switch (optname) {
1210 case RDMA_OPTION_ID_TOS:
1211 if (optlen != sizeof(u8)) {
1212 ret = -EINVAL;
1213 break;
1214 }
1215 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1216 break;
1217 case RDMA_OPTION_ID_REUSEADDR:
1218 if (optlen != sizeof(int)) {
1219 ret = -EINVAL;
1220 break;
1221 }
1222 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1223 break;
1224 case RDMA_OPTION_ID_AFONLY:
1225 if (optlen != sizeof(int)) {
1226 ret = -EINVAL;
1227 break;
1228 }
1229 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1230 break;
1231 case RDMA_OPTION_ID_ACK_TIMEOUT:
1232 if (optlen != sizeof(u8)) {
1233 ret = -EINVAL;
1234 break;
1235 }
1236 ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
1237 break;
1238 default:
1239 ret = -ENOSYS;
1240 }
1241
1242 return ret;
1243}
1244
1245static int ucma_set_ib_path(struct ucma_context *ctx,
1246 struct ib_path_rec_data *path_data, size_t optlen)
1247{
1248 struct sa_path_rec sa_path;
1249 struct rdma_cm_event event;
1250 int ret;
1251
1252 if (optlen % sizeof(*path_data))
1253 return -EINVAL;
1254
1255 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1256 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1257 IB_PATH_BIDIRECTIONAL))
1258 break;
1259 }
1260
1261 if (!optlen)
1262 return -EINVAL;
1263
1264 if (!ctx->cm_id->device)
1265 return -EINVAL;
1266
1267 memset(&sa_path, 0, sizeof(sa_path));
1268
1269 sa_path.rec_type = SA_PATH_REC_TYPE_IB;
1270 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1271
1272 if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
1273 struct sa_path_rec opa;
1274
1275 sa_convert_path_ib_to_opa(&opa, &sa_path);
1276 ret = rdma_set_ib_path(ctx->cm_id, &opa);
1277 } else {
1278 ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
1279 }
1280 if (ret)
1281 return ret;
1282
1283 memset(&event, 0, sizeof event);
1284 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1285 return ucma_event_handler(ctx->cm_id, &event);
1286}
1287
1288static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1289 void *optval, size_t optlen)
1290{
1291 int ret;
1292
1293 switch (optname) {
1294 case RDMA_OPTION_IB_PATH:
1295 ret = ucma_set_ib_path(ctx, optval, optlen);
1296 break;
1297 default:
1298 ret = -ENOSYS;
1299 }
1300
1301 return ret;
1302}
1303
1304static int ucma_set_option_level(struct ucma_context *ctx, int level,
1305 int optname, void *optval, size_t optlen)
1306{
1307 int ret;
1308
1309 switch (level) {
1310 case RDMA_OPTION_ID:
1311 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1312 break;
1313 case RDMA_OPTION_IB:
1314 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1315 break;
1316 default:
1317 ret = -ENOSYS;
1318 }
1319
1320 return ret;
1321}
1322
1323static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1324 int in_len, int out_len)
1325{
1326 struct rdma_ucm_set_option cmd;
1327 struct ucma_context *ctx;
1328 void *optval;
1329 int ret;
1330
1331 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1332 return -EFAULT;
1333
1334 if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
1335 return -EINVAL;
1336
1337 ctx = ucma_get_ctx(file, cmd.id);
1338 if (IS_ERR(ctx))
1339 return PTR_ERR(ctx);
1340
1341 optval = memdup_user(u64_to_user_ptr(cmd.optval),
1342 cmd.optlen);
1343 if (IS_ERR(optval)) {
1344 ret = PTR_ERR(optval);
1345 goto out;
1346 }
1347
1348 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1349 cmd.optlen);
1350 kfree(optval);
1351
1352out:
1353 ucma_put_ctx(ctx);
1354 return ret;
1355}
1356
1357static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1358 int in_len, int out_len)
1359{
1360 struct rdma_ucm_notify cmd;
1361 struct ucma_context *ctx;
1362 int ret = -EINVAL;
1363
1364 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1365 return -EFAULT;
1366
1367 ctx = ucma_get_ctx(file, cmd.id);
1368 if (IS_ERR(ctx))
1369 return PTR_ERR(ctx);
1370
1371 if (ctx->cm_id->device)
1372 ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event);
1373
1374 ucma_put_ctx(ctx);
1375 return ret;
1376}
1377
1378static ssize_t ucma_process_join(struct ucma_file *file,
1379 struct rdma_ucm_join_mcast *cmd, int out_len)
1380{
1381 struct rdma_ucm_create_id_resp resp;
1382 struct ucma_context *ctx;
1383 struct ucma_multicast *mc;
1384 struct sockaddr *addr;
1385 int ret;
1386 u8 join_state;
1387
1388 if (out_len < sizeof(resp))
1389 return -ENOSPC;
1390
1391 addr = (struct sockaddr *) &cmd->addr;
1392 if (cmd->addr_size != rdma_addr_size(addr))
1393 return -EINVAL;
1394
1395 if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
1396 join_state = BIT(FULLMEMBER_JOIN);
1397 else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
1398 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
1399 else
1400 return -EINVAL;
1401
1402 ctx = ucma_get_ctx_dev(file, cmd->id);
1403 if (IS_ERR(ctx))
1404 return PTR_ERR(ctx);
1405
1406 mutex_lock(&file->mut);
1407 mc = ucma_alloc_multicast(ctx);
1408 if (!mc) {
1409 ret = -ENOMEM;
1410 goto err1;
1411 }
1412 mc->join_state = join_state;
1413 mc->uid = cmd->uid;
1414 memcpy(&mc->addr, addr, cmd->addr_size);
1415 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
1416 join_state, mc);
1417 if (ret)
1418 goto err2;
1419
1420 resp.id = mc->id;
1421 if (copy_to_user(u64_to_user_ptr(cmd->response),
1422 &resp, sizeof(resp))) {
1423 ret = -EFAULT;
1424 goto err3;
1425 }
1426
1427 xa_store(&multicast_table, mc->id, mc, 0);
1428
1429 mutex_unlock(&file->mut);
1430 ucma_put_ctx(ctx);
1431 return 0;
1432
1433err3:
1434 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1435 ucma_cleanup_mc_events(mc);
1436err2:
1437 xa_erase(&multicast_table, mc->id);
1438 list_del(&mc->list);
1439 kfree(mc);
1440err1:
1441 mutex_unlock(&file->mut);
1442 ucma_put_ctx(ctx);
1443 return ret;
1444}
1445
1446static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1447 const char __user *inbuf,
1448 int in_len, int out_len)
1449{
1450 struct rdma_ucm_join_ip_mcast cmd;
1451 struct rdma_ucm_join_mcast join_cmd;
1452
1453 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1454 return -EFAULT;
1455
1456 join_cmd.response = cmd.response;
1457 join_cmd.uid = cmd.uid;
1458 join_cmd.id = cmd.id;
1459 join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
1460 if (!join_cmd.addr_size)
1461 return -EINVAL;
1462
1463 join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
1464 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1465
1466 return ucma_process_join(file, &join_cmd, out_len);
1467}
1468
1469static ssize_t ucma_join_multicast(struct ucma_file *file,
1470 const char __user *inbuf,
1471 int in_len, int out_len)
1472{
1473 struct rdma_ucm_join_mcast cmd;
1474
1475 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1476 return -EFAULT;
1477
1478 if (!rdma_addr_size_kss(&cmd.addr))
1479 return -EINVAL;
1480
1481 return ucma_process_join(file, &cmd, out_len);
1482}
1483
1484static ssize_t ucma_leave_multicast(struct ucma_file *file,
1485 const char __user *inbuf,
1486 int in_len, int out_len)
1487{
1488 struct rdma_ucm_destroy_id cmd;
1489 struct rdma_ucm_destroy_id_resp resp;
1490 struct ucma_multicast *mc;
1491 int ret = 0;
1492
1493 if (out_len < sizeof(resp))
1494 return -ENOSPC;
1495
1496 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1497 return -EFAULT;
1498
1499 xa_lock(&multicast_table);
1500 mc = xa_load(&multicast_table, cmd.id);
1501 if (!mc)
1502 mc = ERR_PTR(-ENOENT);
1503 else if (mc->ctx->file != file)
1504 mc = ERR_PTR(-EINVAL);
1505 else if (!atomic_inc_not_zero(&mc->ctx->ref))
1506 mc = ERR_PTR(-ENXIO);
1507 else
1508 __xa_erase(&multicast_table, mc->id);
1509 xa_unlock(&multicast_table);
1510
1511 if (IS_ERR(mc)) {
1512 ret = PTR_ERR(mc);
1513 goto out;
1514 }
1515
1516 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1517 mutex_lock(&mc->ctx->file->mut);
1518 ucma_cleanup_mc_events(mc);
1519 list_del(&mc->list);
1520 mutex_unlock(&mc->ctx->file->mut);
1521
1522 ucma_put_ctx(mc->ctx);
1523 resp.events_reported = mc->events_reported;
1524 kfree(mc);
1525
1526 if (copy_to_user(u64_to_user_ptr(cmd.response),
1527 &resp, sizeof(resp)))
1528 ret = -EFAULT;
1529out:
1530 return ret;
1531}
1532
1533static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1534{
1535
1536 if (file1 < file2) {
1537 mutex_lock(&file1->mut);
1538 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
1539 } else {
1540 mutex_lock(&file2->mut);
1541 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
1542 }
1543}
1544
1545static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1546{
1547 if (file1 < file2) {
1548 mutex_unlock(&file2->mut);
1549 mutex_unlock(&file1->mut);
1550 } else {
1551 mutex_unlock(&file1->mut);
1552 mutex_unlock(&file2->mut);
1553 }
1554}
1555
1556static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1557{
1558 struct ucma_event *uevent, *tmp;
1559
1560 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1561 if (uevent->ctx == ctx)
1562 list_move_tail(&uevent->list, &file->event_list);
1563}
1564
1565static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1566 const char __user *inbuf,
1567 int in_len, int out_len)
1568{
1569 struct rdma_ucm_migrate_id cmd;
1570 struct rdma_ucm_migrate_resp resp;
1571 struct ucma_context *ctx;
1572 struct fd f;
1573 struct ucma_file *cur_file;
1574 int ret = 0;
1575
1576 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1577 return -EFAULT;
1578
1579
1580 f = fdget(cmd.fd);
1581 if (!f.file)
1582 return -ENOENT;
1583 if (f.file->f_op != &ucma_fops) {
1584 ret = -EINVAL;
1585 goto file_put;
1586 }
1587
1588
1589 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1590 if (IS_ERR(ctx)) {
1591 ret = PTR_ERR(ctx);
1592 goto file_put;
1593 }
1594
1595 cur_file = ctx->file;
1596 if (cur_file == new_file) {
1597 resp.events_reported = ctx->events_reported;
1598 goto response;
1599 }
1600
1601
1602
1603
1604
1605 ucma_lock_files(cur_file, new_file);
1606 xa_lock(&ctx_table);
1607
1608 list_move_tail(&ctx->list, &new_file->ctx_list);
1609 ucma_move_events(ctx, new_file);
1610 ctx->file = new_file;
1611 resp.events_reported = ctx->events_reported;
1612
1613 xa_unlock(&ctx_table);
1614 ucma_unlock_files(cur_file, new_file);
1615
1616response:
1617 if (copy_to_user(u64_to_user_ptr(cmd.response),
1618 &resp, sizeof(resp)))
1619 ret = -EFAULT;
1620
1621 ucma_put_ctx(ctx);
1622file_put:
1623 fdput(f);
1624 return ret;
1625}
1626
1627static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1628 const char __user *inbuf,
1629 int in_len, int out_len) = {
1630 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1631 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1632 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1633 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1634 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1635 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1636 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1637 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1638 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1639 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1640 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1641 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1642 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1643 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1644 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1645 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1646 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1647 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1648 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1649 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1650 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1651 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1652 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1653};
1654
1655static ssize_t ucma_write(struct file *filp, const char __user *buf,
1656 size_t len, loff_t *pos)
1657{
1658 struct ucma_file *file = filp->private_data;
1659 struct rdma_ucm_cmd_hdr hdr;
1660 ssize_t ret;
1661
1662 if (!ib_safe_file_access(filp)) {
1663 pr_err_once("ucma_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1664 task_tgid_vnr(current), current->comm);
1665 return -EACCES;
1666 }
1667
1668 if (len < sizeof(hdr))
1669 return -EINVAL;
1670
1671 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1672 return -EFAULT;
1673
1674 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1675 return -EINVAL;
1676 hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table));
1677
1678 if (hdr.in + sizeof(hdr) > len)
1679 return -EINVAL;
1680
1681 if (!ucma_cmd_table[hdr.cmd])
1682 return -ENOSYS;
1683
1684 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1685 if (!ret)
1686 ret = len;
1687
1688 return ret;
1689}
1690
1691static __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait)
1692{
1693 struct ucma_file *file = filp->private_data;
1694 __poll_t mask = 0;
1695
1696 poll_wait(filp, &file->poll_wait, wait);
1697
1698 if (!list_empty(&file->event_list))
1699 mask = EPOLLIN | EPOLLRDNORM;
1700
1701 return mask;
1702}
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712static int ucma_open(struct inode *inode, struct file *filp)
1713{
1714 struct ucma_file *file;
1715
1716 file = kmalloc(sizeof *file, GFP_KERNEL);
1717 if (!file)
1718 return -ENOMEM;
1719
1720 file->close_wq = alloc_ordered_workqueue("ucma_close_id",
1721 WQ_MEM_RECLAIM);
1722 if (!file->close_wq) {
1723 kfree(file);
1724 return -ENOMEM;
1725 }
1726
1727 INIT_LIST_HEAD(&file->event_list);
1728 INIT_LIST_HEAD(&file->ctx_list);
1729 init_waitqueue_head(&file->poll_wait);
1730 mutex_init(&file->mut);
1731
1732 filp->private_data = file;
1733 file->filp = filp;
1734
1735 return stream_open(inode, filp);
1736}
1737
1738static int ucma_close(struct inode *inode, struct file *filp)
1739{
1740 struct ucma_file *file = filp->private_data;
1741 struct ucma_context *ctx, *tmp;
1742
1743 mutex_lock(&file->mut);
1744 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1745 ctx->destroying = 1;
1746 mutex_unlock(&file->mut);
1747
1748 xa_erase(&ctx_table, ctx->id);
1749 flush_workqueue(file->close_wq);
1750
1751
1752
1753
1754 xa_lock(&ctx_table);
1755 if (!ctx->closing) {
1756 xa_unlock(&ctx_table);
1757 ucma_put_ctx(ctx);
1758 wait_for_completion(&ctx->comp);
1759
1760
1761
1762 rdma_destroy_id(ctx->cm_id);
1763 } else {
1764 xa_unlock(&ctx_table);
1765 }
1766
1767 ucma_free_ctx(ctx);
1768 mutex_lock(&file->mut);
1769 }
1770 mutex_unlock(&file->mut);
1771 destroy_workqueue(file->close_wq);
1772 kfree(file);
1773 return 0;
1774}
1775
1776static const struct file_operations ucma_fops = {
1777 .owner = THIS_MODULE,
1778 .open = ucma_open,
1779 .release = ucma_close,
1780 .write = ucma_write,
1781 .poll = ucma_poll,
1782 .llseek = no_llseek,
1783};
1784
1785static struct miscdevice ucma_misc = {
1786 .minor = MISC_DYNAMIC_MINOR,
1787 .name = "rdma_cm",
1788 .nodename = "infiniband/rdma_cm",
1789 .mode = 0666,
1790 .fops = &ucma_fops,
1791};
1792
1793static int ucma_get_global_nl_info(struct ib_client_nl_info *res)
1794{
1795 res->abi = RDMA_USER_CM_ABI_VERSION;
1796 res->cdev = ucma_misc.this_device;
1797 return 0;
1798}
1799
1800static struct ib_client rdma_cma_client = {
1801 .name = "rdma_cm",
1802 .get_global_nl_info = ucma_get_global_nl_info,
1803};
1804MODULE_ALIAS_RDMA_CLIENT("rdma_cm");
1805
1806static ssize_t show_abi_version(struct device *dev,
1807 struct device_attribute *attr,
1808 char *buf)
1809{
1810 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1811}
1812static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1813
1814static int __init ucma_init(void)
1815{
1816 int ret;
1817
1818 ret = misc_register(&ucma_misc);
1819 if (ret)
1820 return ret;
1821
1822 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1823 if (ret) {
1824 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1825 goto err1;
1826 }
1827
1828 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1829 if (!ucma_ctl_table_hdr) {
1830 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1831 ret = -ENOMEM;
1832 goto err2;
1833 }
1834
1835 ret = ib_register_client(&rdma_cma_client);
1836 if (ret)
1837 goto err3;
1838
1839 return 0;
1840err3:
1841 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1842err2:
1843 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1844err1:
1845 misc_deregister(&ucma_misc);
1846 return ret;
1847}
1848
1849static void __exit ucma_cleanup(void)
1850{
1851 ib_unregister_client(&rdma_cma_client);
1852 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1853 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1854 misc_deregister(&ucma_misc);
1855}
1856
1857module_init(ucma_init);
1858module_exit(ucma_cleanup);
1859
