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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 struct workqueue_struct *close_wq;
84};
85
86struct ucma_context {
87 u32 id;
88 struct completion comp;
89 refcount_t ref;
90 int events_reported;
91 int backlog;
92
93 struct ucma_file *file;
94 struct rdma_cm_id *cm_id;
95 struct mutex mutex;
96 u64 uid;
97
98 struct list_head list;
99 struct list_head mc_list;
100
101
102
103 int closing;
104
105 int destroying;
106 struct work_struct close_work;
107};
108
109struct ucma_multicast {
110 struct ucma_context *ctx;
111 u32 id;
112 int events_reported;
113
114 u64 uid;
115 u8 join_state;
116 struct list_head list;
117 struct sockaddr_storage addr;
118};
119
120struct ucma_event {
121 struct ucma_context *ctx;
122 struct ucma_multicast *mc;
123 struct list_head list;
124 struct rdma_cm_id *cm_id;
125 struct rdma_ucm_event_resp resp;
126 struct work_struct close_work;
127};
128
129static DEFINE_XARRAY_ALLOC(ctx_table);
130static DEFINE_XARRAY_ALLOC(multicast_table);
131
132static const struct file_operations ucma_fops;
133
134static inline struct ucma_context *_ucma_find_context(int id,
135 struct ucma_file *file)
136{
137 struct ucma_context *ctx;
138
139 ctx = xa_load(&ctx_table, id);
140 if (!ctx)
141 ctx = ERR_PTR(-ENOENT);
142 else if (ctx->file != file || !ctx->cm_id)
143 ctx = ERR_PTR(-EINVAL);
144 return ctx;
145}
146
147static struct ucma_context *ucma_get_ctx(struct ucma_file *file, int id)
148{
149 struct ucma_context *ctx;
150
151 xa_lock(&ctx_table);
152 ctx = _ucma_find_context(id, file);
153 if (!IS_ERR(ctx)) {
154 if (ctx->closing)
155 ctx = ERR_PTR(-EIO);
156 else
157 refcount_inc(&ctx->ref);
158 }
159 xa_unlock(&ctx_table);
160 return ctx;
161}
162
163static void ucma_put_ctx(struct ucma_context *ctx)
164{
165 if (refcount_dec_and_test(&ctx->ref))
166 complete(&ctx->comp);
167}
168
169
170
171
172
173static struct ucma_context *ucma_get_ctx_dev(struct ucma_file *file, int id)
174{
175 struct ucma_context *ctx = ucma_get_ctx(file, id);
176
177 if (IS_ERR(ctx))
178 return ctx;
179 if (!ctx->cm_id->device) {
180 ucma_put_ctx(ctx);
181 return ERR_PTR(-EINVAL);
182 }
183 return ctx;
184}
185
186static void ucma_close_event_id(struct work_struct *work)
187{
188 struct ucma_event *uevent_close = container_of(work, struct ucma_event, close_work);
189
190 rdma_destroy_id(uevent_close->cm_id);
191 kfree(uevent_close);
192}
193
194static void ucma_close_id(struct work_struct *work)
195{
196 struct ucma_context *ctx = container_of(work, struct ucma_context, close_work);
197
198
199
200
201
202 ucma_put_ctx(ctx);
203 wait_for_completion(&ctx->comp);
204
205 rdma_destroy_id(ctx->cm_id);
206}
207
208static struct ucma_context *ucma_alloc_ctx(struct ucma_file *file)
209{
210 struct ucma_context *ctx;
211
212 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
213 if (!ctx)
214 return NULL;
215
216 INIT_WORK(&ctx->close_work, ucma_close_id);
217 refcount_set(&ctx->ref, 1);
218 init_completion(&ctx->comp);
219 INIT_LIST_HEAD(&ctx->mc_list);
220 ctx->file = file;
221 mutex_init(&ctx->mutex);
222
223 if (xa_alloc(&ctx_table, &ctx->id, ctx, xa_limit_32b, GFP_KERNEL))
224 goto error;
225
226 list_add_tail(&ctx->list, &file->ctx_list);
227 return ctx;
228
229error:
230 kfree(ctx);
231 return NULL;
232}
233
234static struct ucma_multicast* ucma_alloc_multicast(struct ucma_context *ctx)
235{
236 struct ucma_multicast *mc;
237
238 mc = kzalloc(sizeof(*mc), GFP_KERNEL);
239 if (!mc)
240 return NULL;
241
242 mc->ctx = ctx;
243 if (xa_alloc(&multicast_table, &mc->id, NULL, xa_limit_32b, GFP_KERNEL))
244 goto error;
245
246 list_add_tail(&mc->list, &ctx->mc_list);
247 return mc;
248
249error:
250 kfree(mc);
251 return NULL;
252}
253
254static void ucma_copy_conn_event(struct rdma_ucm_conn_param *dst,
255 struct rdma_conn_param *src)
256{
257 if (src->private_data_len)
258 memcpy(dst->private_data, src->private_data,
259 src->private_data_len);
260 dst->private_data_len = src->private_data_len;
261 dst->responder_resources =src->responder_resources;
262 dst->initiator_depth = src->initiator_depth;
263 dst->flow_control = src->flow_control;
264 dst->retry_count = src->retry_count;
265 dst->rnr_retry_count = src->rnr_retry_count;
266 dst->srq = src->srq;
267 dst->qp_num = src->qp_num;
268}
269
270static void ucma_copy_ud_event(struct ib_device *device,
271 struct rdma_ucm_ud_param *dst,
272 struct rdma_ud_param *src)
273{
274 if (src->private_data_len)
275 memcpy(dst->private_data, src->private_data,
276 src->private_data_len);
277 dst->private_data_len = src->private_data_len;
278 ib_copy_ah_attr_to_user(device, &dst->ah_attr, &src->ah_attr);
279 dst->qp_num = src->qp_num;
280 dst->qkey = src->qkey;
281}
282
283static void ucma_set_event_context(struct ucma_context *ctx,
284 struct rdma_cm_event *event,
285 struct ucma_event *uevent)
286{
287 uevent->ctx = ctx;
288 switch (event->event) {
289 case RDMA_CM_EVENT_MULTICAST_JOIN:
290 case RDMA_CM_EVENT_MULTICAST_ERROR:
291 uevent->mc = (struct ucma_multicast *)
292 event->param.ud.private_data;
293 uevent->resp.uid = uevent->mc->uid;
294 uevent->resp.id = uevent->mc->id;
295 break;
296 default:
297 uevent->resp.uid = ctx->uid;
298 uevent->resp.id = ctx->id;
299 break;
300 }
301}
302
303
304static void ucma_removal_event_handler(struct rdma_cm_id *cm_id)
305{
306 struct ucma_context *ctx = cm_id->context;
307 struct ucma_event *con_req_eve;
308 int event_found = 0;
309
310 if (ctx->destroying)
311 return;
312
313
314
315
316
317
318
319 if (ctx->cm_id == cm_id) {
320 xa_lock(&ctx_table);
321 ctx->closing = 1;
322 xa_unlock(&ctx_table);
323 queue_work(ctx->file->close_wq, &ctx->close_work);
324 return;
325 }
326
327 list_for_each_entry(con_req_eve, &ctx->file->event_list, list) {
328 if (con_req_eve->cm_id == cm_id &&
329 con_req_eve->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
330 list_del(&con_req_eve->list);
331 INIT_WORK(&con_req_eve->close_work, ucma_close_event_id);
332 queue_work(ctx->file->close_wq, &con_req_eve->close_work);
333 event_found = 1;
334 break;
335 }
336 }
337 if (!event_found)
338 pr_err("ucma_removal_event_handler: warning: connect request event wasn't found\n");
339}
340
341static int ucma_event_handler(struct rdma_cm_id *cm_id,
342 struct rdma_cm_event *event)
343{
344 struct ucma_event *uevent;
345 struct ucma_context *ctx = cm_id->context;
346 int ret = 0;
347
348 uevent = kzalloc(sizeof(*uevent), GFP_KERNEL);
349 if (!uevent)
350 return event->event == RDMA_CM_EVENT_CONNECT_REQUEST;
351
352 mutex_lock(&ctx->file->mut);
353 uevent->cm_id = cm_id;
354 ucma_set_event_context(ctx, event, uevent);
355 uevent->resp.event = event->event;
356 uevent->resp.status = event->status;
357 if (cm_id->qp_type == IB_QPT_UD)
358 ucma_copy_ud_event(cm_id->device, &uevent->resp.param.ud,
359 &event->param.ud);
360 else
361 ucma_copy_conn_event(&uevent->resp.param.conn,
362 &event->param.conn);
363
364 uevent->resp.ece.vendor_id = event->ece.vendor_id;
365 uevent->resp.ece.attr_mod = event->ece.attr_mod;
366
367 if (event->event == RDMA_CM_EVENT_CONNECT_REQUEST) {
368 if (!ctx->backlog) {
369 ret = -ENOMEM;
370 kfree(uevent);
371 goto out;
372 }
373 ctx->backlog--;
374 } else if (!ctx->uid || ctx->cm_id != cm_id) {
375
376
377
378
379
380
381
382
383 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
384 ucma_removal_event_handler(cm_id);
385
386 kfree(uevent);
387 goto out;
388 }
389
390 list_add_tail(&uevent->list, &ctx->file->event_list);
391 wake_up_interruptible(&ctx->file->poll_wait);
392 if (event->event == RDMA_CM_EVENT_DEVICE_REMOVAL)
393 ucma_removal_event_handler(cm_id);
394out:
395 mutex_unlock(&ctx->file->mut);
396 return ret;
397}
398
399static ssize_t ucma_get_event(struct ucma_file *file, const char __user *inbuf,
400 int in_len, int out_len)
401{
402 struct ucma_context *ctx;
403 struct rdma_ucm_get_event cmd;
404 struct ucma_event *uevent;
405 int ret = 0;
406
407
408
409
410
411 if (out_len < sizeof(uevent->resp) - sizeof(uevent->resp.reserved) -
412 sizeof(uevent->resp.ece))
413 return -ENOSPC;
414
415 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
416 return -EFAULT;
417
418 mutex_lock(&file->mut);
419 while (list_empty(&file->event_list)) {
420 mutex_unlock(&file->mut);
421
422 if (file->filp->f_flags & O_NONBLOCK)
423 return -EAGAIN;
424
425 if (wait_event_interruptible(file->poll_wait,
426 !list_empty(&file->event_list)))
427 return -ERESTARTSYS;
428
429 mutex_lock(&file->mut);
430 }
431
432 uevent = list_entry(file->event_list.next, struct ucma_event, list);
433
434 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST) {
435 ctx = ucma_alloc_ctx(file);
436 if (!ctx) {
437 ret = -ENOMEM;
438 goto done;
439 }
440 uevent->ctx->backlog++;
441 ctx->cm_id = uevent->cm_id;
442 ctx->cm_id->context = ctx;
443 uevent->resp.id = ctx->id;
444 }
445
446 if (copy_to_user(u64_to_user_ptr(cmd.response),
447 &uevent->resp,
448 min_t(size_t, out_len, sizeof(uevent->resp)))) {
449 ret = -EFAULT;
450 goto done;
451 }
452
453 list_del(&uevent->list);
454 uevent->ctx->events_reported++;
455 if (uevent->mc)
456 uevent->mc->events_reported++;
457 kfree(uevent);
458done:
459 mutex_unlock(&file->mut);
460 return ret;
461}
462
463static int ucma_get_qp_type(struct rdma_ucm_create_id *cmd, enum ib_qp_type *qp_type)
464{
465 switch (cmd->ps) {
466 case RDMA_PS_TCP:
467 *qp_type = IB_QPT_RC;
468 return 0;
469 case RDMA_PS_UDP:
470 case RDMA_PS_IPOIB:
471 *qp_type = IB_QPT_UD;
472 return 0;
473 case RDMA_PS_IB:
474 *qp_type = cmd->qp_type;
475 return 0;
476 default:
477 return -EINVAL;
478 }
479}
480
481static ssize_t ucma_create_id(struct ucma_file *file, const char __user *inbuf,
482 int in_len, int out_len)
483{
484 struct rdma_ucm_create_id cmd;
485 struct rdma_ucm_create_id_resp resp;
486 struct ucma_context *ctx;
487 struct rdma_cm_id *cm_id;
488 enum ib_qp_type qp_type;
489 int ret;
490
491 if (out_len < sizeof(resp))
492 return -ENOSPC;
493
494 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
495 return -EFAULT;
496
497 ret = ucma_get_qp_type(&cmd, &qp_type);
498 if (ret)
499 return ret;
500
501 mutex_lock(&file->mut);
502 ctx = ucma_alloc_ctx(file);
503 mutex_unlock(&file->mut);
504 if (!ctx)
505 return -ENOMEM;
506
507 ctx->uid = cmd.uid;
508 cm_id = __rdma_create_id(current->nsproxy->net_ns,
509 ucma_event_handler, ctx, cmd.ps, qp_type, NULL);
510 if (IS_ERR(cm_id)) {
511 ret = PTR_ERR(cm_id);
512 goto err1;
513 }
514
515 resp.id = ctx->id;
516 if (copy_to_user(u64_to_user_ptr(cmd.response),
517 &resp, sizeof(resp))) {
518 ret = -EFAULT;
519 goto err2;
520 }
521
522 ctx->cm_id = cm_id;
523 return 0;
524
525err2:
526 rdma_destroy_id(cm_id);
527err1:
528 xa_erase(&ctx_table, ctx->id);
529 mutex_lock(&file->mut);
530 list_del(&ctx->list);
531 mutex_unlock(&file->mut);
532 kfree(ctx);
533 return ret;
534}
535
536static void ucma_cleanup_multicast(struct ucma_context *ctx)
537{
538 struct ucma_multicast *mc, *tmp;
539
540 mutex_lock(&ctx->file->mut);
541 list_for_each_entry_safe(mc, tmp, &ctx->mc_list, list) {
542 list_del(&mc->list);
543 xa_erase(&multicast_table, mc->id);
544 kfree(mc);
545 }
546 mutex_unlock(&ctx->file->mut);
547}
548
549static void ucma_cleanup_mc_events(struct ucma_multicast *mc)
550{
551 struct ucma_event *uevent, *tmp;
552
553 list_for_each_entry_safe(uevent, tmp, &mc->ctx->file->event_list, list) {
554 if (uevent->mc != mc)
555 continue;
556
557 list_del(&uevent->list);
558 kfree(uevent);
559 }
560}
561
562
563
564
565
566
567
568
569
570
571
572
573static int ucma_free_ctx(struct ucma_context *ctx)
574{
575 int events_reported;
576 struct ucma_event *uevent, *tmp;
577 LIST_HEAD(list);
578
579
580 ucma_cleanup_multicast(ctx);
581
582
583 mutex_lock(&ctx->file->mut);
584 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list) {
585 if (uevent->ctx == ctx)
586 list_move_tail(&uevent->list, &list);
587 }
588 list_del(&ctx->list);
589 mutex_unlock(&ctx->file->mut);
590
591 list_for_each_entry_safe(uevent, tmp, &list, list) {
592 list_del(&uevent->list);
593 if (uevent->resp.event == RDMA_CM_EVENT_CONNECT_REQUEST)
594 rdma_destroy_id(uevent->cm_id);
595 kfree(uevent);
596 }
597
598 events_reported = ctx->events_reported;
599 mutex_destroy(&ctx->mutex);
600 kfree(ctx);
601 return events_reported;
602}
603
604static ssize_t ucma_destroy_id(struct ucma_file *file, const char __user *inbuf,
605 int in_len, int out_len)
606{
607 struct rdma_ucm_destroy_id cmd;
608 struct rdma_ucm_destroy_id_resp resp;
609 struct ucma_context *ctx;
610 int ret = 0;
611
612 if (out_len < sizeof(resp))
613 return -ENOSPC;
614
615 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
616 return -EFAULT;
617
618 xa_lock(&ctx_table);
619 ctx = _ucma_find_context(cmd.id, file);
620 if (!IS_ERR(ctx))
621 __xa_erase(&ctx_table, ctx->id);
622 xa_unlock(&ctx_table);
623
624 if (IS_ERR(ctx))
625 return PTR_ERR(ctx);
626
627 mutex_lock(&ctx->file->mut);
628 ctx->destroying = 1;
629 mutex_unlock(&ctx->file->mut);
630
631 flush_workqueue(ctx->file->close_wq);
632
633
634 xa_lock(&ctx_table);
635 if (!ctx->closing) {
636 xa_unlock(&ctx_table);
637 ucma_put_ctx(ctx);
638 wait_for_completion(&ctx->comp);
639 rdma_destroy_id(ctx->cm_id);
640 } else {
641 xa_unlock(&ctx_table);
642 }
643
644 resp.events_reported = ucma_free_ctx(ctx);
645 if (copy_to_user(u64_to_user_ptr(cmd.response),
646 &resp, sizeof(resp)))
647 ret = -EFAULT;
648
649 return ret;
650}
651
652static ssize_t ucma_bind_ip(struct ucma_file *file, const char __user *inbuf,
653 int in_len, int out_len)
654{
655 struct rdma_ucm_bind_ip cmd;
656 struct ucma_context *ctx;
657 int ret;
658
659 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
660 return -EFAULT;
661
662 if (!rdma_addr_size_in6(&cmd.addr))
663 return -EINVAL;
664
665 ctx = ucma_get_ctx(file, cmd.id);
666 if (IS_ERR(ctx))
667 return PTR_ERR(ctx);
668
669 mutex_lock(&ctx->mutex);
670 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
671 mutex_unlock(&ctx->mutex);
672
673 ucma_put_ctx(ctx);
674 return ret;
675}
676
677static ssize_t ucma_bind(struct ucma_file *file, const char __user *inbuf,
678 int in_len, int out_len)
679{
680 struct rdma_ucm_bind cmd;
681 struct ucma_context *ctx;
682 int ret;
683
684 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
685 return -EFAULT;
686
687 if (cmd.reserved || !cmd.addr_size ||
688 cmd.addr_size != rdma_addr_size_kss(&cmd.addr))
689 return -EINVAL;
690
691 ctx = ucma_get_ctx(file, cmd.id);
692 if (IS_ERR(ctx))
693 return PTR_ERR(ctx);
694
695 mutex_lock(&ctx->mutex);
696 ret = rdma_bind_addr(ctx->cm_id, (struct sockaddr *) &cmd.addr);
697 mutex_unlock(&ctx->mutex);
698 ucma_put_ctx(ctx);
699 return ret;
700}
701
702static ssize_t ucma_resolve_ip(struct ucma_file *file,
703 const char __user *inbuf,
704 int in_len, int out_len)
705{
706 struct rdma_ucm_resolve_ip cmd;
707 struct ucma_context *ctx;
708 int ret;
709
710 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
711 return -EFAULT;
712
713 if ((cmd.src_addr.sin6_family && !rdma_addr_size_in6(&cmd.src_addr)) ||
714 !rdma_addr_size_in6(&cmd.dst_addr))
715 return -EINVAL;
716
717 ctx = ucma_get_ctx(file, cmd.id);
718 if (IS_ERR(ctx))
719 return PTR_ERR(ctx);
720
721 mutex_lock(&ctx->mutex);
722 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
723 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
724 mutex_unlock(&ctx->mutex);
725 ucma_put_ctx(ctx);
726 return ret;
727}
728
729static ssize_t ucma_resolve_addr(struct ucma_file *file,
730 const char __user *inbuf,
731 int in_len, int out_len)
732{
733 struct rdma_ucm_resolve_addr cmd;
734 struct ucma_context *ctx;
735 int ret;
736
737 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
738 return -EFAULT;
739
740 if (cmd.reserved ||
741 (cmd.src_size && (cmd.src_size != rdma_addr_size_kss(&cmd.src_addr))) ||
742 !cmd.dst_size || (cmd.dst_size != rdma_addr_size_kss(&cmd.dst_addr)))
743 return -EINVAL;
744
745 ctx = ucma_get_ctx(file, cmd.id);
746 if (IS_ERR(ctx))
747 return PTR_ERR(ctx);
748
749 mutex_lock(&ctx->mutex);
750 ret = rdma_resolve_addr(ctx->cm_id, (struct sockaddr *) &cmd.src_addr,
751 (struct sockaddr *) &cmd.dst_addr, cmd.timeout_ms);
752 mutex_unlock(&ctx->mutex);
753 ucma_put_ctx(ctx);
754 return ret;
755}
756
757static ssize_t ucma_resolve_route(struct ucma_file *file,
758 const char __user *inbuf,
759 int in_len, int out_len)
760{
761 struct rdma_ucm_resolve_route cmd;
762 struct ucma_context *ctx;
763 int ret;
764
765 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
766 return -EFAULT;
767
768 ctx = ucma_get_ctx_dev(file, cmd.id);
769 if (IS_ERR(ctx))
770 return PTR_ERR(ctx);
771
772 mutex_lock(&ctx->mutex);
773 ret = rdma_resolve_route(ctx->cm_id, cmd.timeout_ms);
774 mutex_unlock(&ctx->mutex);
775 ucma_put_ctx(ctx);
776 return ret;
777}
778
779static void ucma_copy_ib_route(struct rdma_ucm_query_route_resp *resp,
780 struct rdma_route *route)
781{
782 struct rdma_dev_addr *dev_addr;
783
784 resp->num_paths = route->num_paths;
785 switch (route->num_paths) {
786 case 0:
787 dev_addr = &route->addr.dev_addr;
788 rdma_addr_get_dgid(dev_addr,
789 (union ib_gid *) &resp->ib_route[0].dgid);
790 rdma_addr_get_sgid(dev_addr,
791 (union ib_gid *) &resp->ib_route[0].sgid);
792 resp->ib_route[0].pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr));
793 break;
794 case 2:
795 ib_copy_path_rec_to_user(&resp->ib_route[1],
796 &route->path_rec[1]);
797 fallthrough;
798 case 1:
799 ib_copy_path_rec_to_user(&resp->ib_route[0],
800 &route->path_rec[0]);
801 break;
802 default:
803 break;
804 }
805}
806
807static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
808 struct rdma_route *route)
809{
810
811 resp->num_paths = route->num_paths;
812 switch (route->num_paths) {
813 case 0:
814 rdma_ip2gid((struct sockaddr *)&route->addr.dst_addr,
815 (union ib_gid *)&resp->ib_route[0].dgid);
816 rdma_ip2gid((struct sockaddr *)&route->addr.src_addr,
817 (union ib_gid *)&resp->ib_route[0].sgid);
818 resp->ib_route[0].pkey = cpu_to_be16(0xffff);
819 break;
820 case 2:
821 ib_copy_path_rec_to_user(&resp->ib_route[1],
822 &route->path_rec[1]);
823 fallthrough;
824 case 1:
825 ib_copy_path_rec_to_user(&resp->ib_route[0],
826 &route->path_rec[0]);
827 break;
828 default:
829 break;
830 }
831}
832
833static void ucma_copy_iw_route(struct rdma_ucm_query_route_resp *resp,
834 struct rdma_route *route)
835{
836 struct rdma_dev_addr *dev_addr;
837
838 dev_addr = &route->addr.dev_addr;
839 rdma_addr_get_dgid(dev_addr, (union ib_gid *) &resp->ib_route[0].dgid);
840 rdma_addr_get_sgid(dev_addr, (union ib_gid *) &resp->ib_route[0].sgid);
841}
842
843static ssize_t ucma_query_route(struct ucma_file *file,
844 const char __user *inbuf,
845 int in_len, int out_len)
846{
847 struct rdma_ucm_query cmd;
848 struct rdma_ucm_query_route_resp resp;
849 struct ucma_context *ctx;
850 struct sockaddr *addr;
851 int ret = 0;
852
853 if (out_len < offsetof(struct rdma_ucm_query_route_resp, ibdev_index))
854 return -ENOSPC;
855
856 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
857 return -EFAULT;
858
859 ctx = ucma_get_ctx(file, cmd.id);
860 if (IS_ERR(ctx))
861 return PTR_ERR(ctx);
862
863 mutex_lock(&ctx->mutex);
864 memset(&resp, 0, sizeof resp);
865 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
866 memcpy(&resp.src_addr, addr, addr->sa_family == AF_INET ?
867 sizeof(struct sockaddr_in) :
868 sizeof(struct sockaddr_in6));
869 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
870 memcpy(&resp.dst_addr, addr, addr->sa_family == AF_INET ?
871 sizeof(struct sockaddr_in) :
872 sizeof(struct sockaddr_in6));
873 if (!ctx->cm_id->device)
874 goto out;
875
876 resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
877 resp.ibdev_index = ctx->cm_id->device->index;
878 resp.port_num = ctx->cm_id->port_num;
879
880 if (rdma_cap_ib_sa(ctx->cm_id->device, ctx->cm_id->port_num))
881 ucma_copy_ib_route(&resp, &ctx->cm_id->route);
882 else if (rdma_protocol_roce(ctx->cm_id->device, ctx->cm_id->port_num))
883 ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
884 else if (rdma_protocol_iwarp(ctx->cm_id->device, ctx->cm_id->port_num))
885 ucma_copy_iw_route(&resp, &ctx->cm_id->route);
886
887out:
888 mutex_unlock(&ctx->mutex);
889 if (copy_to_user(u64_to_user_ptr(cmd.response), &resp,
890 min_t(size_t, out_len, sizeof(resp))))
891 ret = -EFAULT;
892
893 ucma_put_ctx(ctx);
894 return ret;
895}
896
897static void ucma_query_device_addr(struct rdma_cm_id *cm_id,
898 struct rdma_ucm_query_addr_resp *resp)
899{
900 if (!cm_id->device)
901 return;
902
903 resp->node_guid = (__force __u64) cm_id->device->node_guid;
904 resp->ibdev_index = cm_id->device->index;
905 resp->port_num = cm_id->port_num;
906 resp->pkey = (__force __u16) cpu_to_be16(
907 ib_addr_get_pkey(&cm_id->route.addr.dev_addr));
908}
909
910static ssize_t ucma_query_addr(struct ucma_context *ctx,
911 void __user *response, int out_len)
912{
913 struct rdma_ucm_query_addr_resp resp;
914 struct sockaddr *addr;
915 int ret = 0;
916
917 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
918 return -ENOSPC;
919
920 memset(&resp, 0, sizeof resp);
921
922 addr = (struct sockaddr *) &ctx->cm_id->route.addr.src_addr;
923 resp.src_size = rdma_addr_size(addr);
924 memcpy(&resp.src_addr, addr, resp.src_size);
925
926 addr = (struct sockaddr *) &ctx->cm_id->route.addr.dst_addr;
927 resp.dst_size = rdma_addr_size(addr);
928 memcpy(&resp.dst_addr, addr, resp.dst_size);
929
930 ucma_query_device_addr(ctx->cm_id, &resp);
931
932 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
933 ret = -EFAULT;
934
935 return ret;
936}
937
938static ssize_t ucma_query_path(struct ucma_context *ctx,
939 void __user *response, int out_len)
940{
941 struct rdma_ucm_query_path_resp *resp;
942 int i, ret = 0;
943
944 if (out_len < sizeof(*resp))
945 return -ENOSPC;
946
947 resp = kzalloc(out_len, GFP_KERNEL);
948 if (!resp)
949 return -ENOMEM;
950
951 resp->num_paths = ctx->cm_id->route.num_paths;
952 for (i = 0, out_len -= sizeof(*resp);
953 i < resp->num_paths && out_len > sizeof(struct ib_path_rec_data);
954 i++, out_len -= sizeof(struct ib_path_rec_data)) {
955 struct sa_path_rec *rec = &ctx->cm_id->route.path_rec[i];
956
957 resp->path_data[i].flags = IB_PATH_GMP | IB_PATH_PRIMARY |
958 IB_PATH_BIDIRECTIONAL;
959 if (rec->rec_type == SA_PATH_REC_TYPE_OPA) {
960 struct sa_path_rec ib;
961
962 sa_convert_path_opa_to_ib(&ib, rec);
963 ib_sa_pack_path(&ib, &resp->path_data[i].path_rec);
964
965 } else {
966 ib_sa_pack_path(rec, &resp->path_data[i].path_rec);
967 }
968 }
969
970 if (copy_to_user(response, resp, struct_size(resp, path_data, i)))
971 ret = -EFAULT;
972
973 kfree(resp);
974 return ret;
975}
976
977static ssize_t ucma_query_gid(struct ucma_context *ctx,
978 void __user *response, int out_len)
979{
980 struct rdma_ucm_query_addr_resp resp;
981 struct sockaddr_ib *addr;
982 int ret = 0;
983
984 if (out_len < offsetof(struct rdma_ucm_query_addr_resp, ibdev_index))
985 return -ENOSPC;
986
987 memset(&resp, 0, sizeof resp);
988
989 ucma_query_device_addr(ctx->cm_id, &resp);
990
991 addr = (struct sockaddr_ib *) &resp.src_addr;
992 resp.src_size = sizeof(*addr);
993 if (ctx->cm_id->route.addr.src_addr.ss_family == AF_IB) {
994 memcpy(addr, &ctx->cm_id->route.addr.src_addr, resp.src_size);
995 } else {
996 addr->sib_family = AF_IB;
997 addr->sib_pkey = (__force __be16) resp.pkey;
998 rdma_read_gids(ctx->cm_id, (union ib_gid *)&addr->sib_addr,
999 NULL);
1000 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
1001 &ctx->cm_id->route.addr.src_addr);
1002 }
1003
1004 addr = (struct sockaddr_ib *) &resp.dst_addr;
1005 resp.dst_size = sizeof(*addr);
1006 if (ctx->cm_id->route.addr.dst_addr.ss_family == AF_IB) {
1007 memcpy(addr, &ctx->cm_id->route.addr.dst_addr, resp.dst_size);
1008 } else {
1009 addr->sib_family = AF_IB;
1010 addr->sib_pkey = (__force __be16) resp.pkey;
1011 rdma_read_gids(ctx->cm_id, NULL,
1012 (union ib_gid *)&addr->sib_addr);
1013 addr->sib_sid = rdma_get_service_id(ctx->cm_id, (struct sockaddr *)
1014 &ctx->cm_id->route.addr.dst_addr);
1015 }
1016
1017 if (copy_to_user(response, &resp, min_t(size_t, out_len, sizeof(resp))))
1018 ret = -EFAULT;
1019
1020 return ret;
1021}
1022
1023static ssize_t ucma_query(struct ucma_file *file,
1024 const char __user *inbuf,
1025 int in_len, int out_len)
1026{
1027 struct rdma_ucm_query cmd;
1028 struct ucma_context *ctx;
1029 void __user *response;
1030 int ret;
1031
1032 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1033 return -EFAULT;
1034
1035 response = u64_to_user_ptr(cmd.response);
1036 ctx = ucma_get_ctx(file, cmd.id);
1037 if (IS_ERR(ctx))
1038 return PTR_ERR(ctx);
1039
1040 mutex_lock(&ctx->mutex);
1041 switch (cmd.option) {
1042 case RDMA_USER_CM_QUERY_ADDR:
1043 ret = ucma_query_addr(ctx, response, out_len);
1044 break;
1045 case RDMA_USER_CM_QUERY_PATH:
1046 ret = ucma_query_path(ctx, response, out_len);
1047 break;
1048 case RDMA_USER_CM_QUERY_GID:
1049 ret = ucma_query_gid(ctx, response, out_len);
1050 break;
1051 default:
1052 ret = -ENOSYS;
1053 break;
1054 }
1055 mutex_unlock(&ctx->mutex);
1056
1057 ucma_put_ctx(ctx);
1058 return ret;
1059}
1060
1061static void ucma_copy_conn_param(struct rdma_cm_id *id,
1062 struct rdma_conn_param *dst,
1063 struct rdma_ucm_conn_param *src)
1064{
1065 dst->private_data = src->private_data;
1066 dst->private_data_len = src->private_data_len;
1067 dst->responder_resources =src->responder_resources;
1068 dst->initiator_depth = src->initiator_depth;
1069 dst->flow_control = src->flow_control;
1070 dst->retry_count = src->retry_count;
1071 dst->rnr_retry_count = src->rnr_retry_count;
1072 dst->srq = src->srq;
1073 dst->qp_num = src->qp_num & 0xFFFFFF;
1074 dst->qkey = (id->route.addr.src_addr.ss_family == AF_IB) ? src->qkey : 0;
1075}
1076
1077static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
1078 int in_len, int out_len)
1079{
1080 struct rdma_conn_param conn_param;
1081 struct rdma_ucm_ece ece = {};
1082 struct rdma_ucm_connect cmd;
1083 struct ucma_context *ctx;
1084 size_t in_size;
1085 int ret;
1086
1087 if (in_len < offsetofend(typeof(cmd), reserved))
1088 return -EINVAL;
1089 in_size = min_t(size_t, in_len, sizeof(cmd));
1090 if (copy_from_user(&cmd, inbuf, in_size))
1091 return -EFAULT;
1092
1093 if (!cmd.conn_param.valid)
1094 return -EINVAL;
1095
1096 ctx = ucma_get_ctx_dev(file, cmd.id);
1097 if (IS_ERR(ctx))
1098 return PTR_ERR(ctx);
1099
1100 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1101 if (offsetofend(typeof(cmd), ece) <= in_size) {
1102 ece.vendor_id = cmd.ece.vendor_id;
1103 ece.attr_mod = cmd.ece.attr_mod;
1104 }
1105
1106 mutex_lock(&ctx->mutex);
1107 ret = rdma_connect_ece(ctx->cm_id, &conn_param, &ece);
1108 mutex_unlock(&ctx->mutex);
1109 ucma_put_ctx(ctx);
1110 return ret;
1111}
1112
1113static ssize_t ucma_listen(struct ucma_file *file, const char __user *inbuf,
1114 int in_len, int out_len)
1115{
1116 struct rdma_ucm_listen cmd;
1117 struct ucma_context *ctx;
1118 int ret;
1119
1120 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1121 return -EFAULT;
1122
1123 ctx = ucma_get_ctx(file, cmd.id);
1124 if (IS_ERR(ctx))
1125 return PTR_ERR(ctx);
1126
1127 ctx->backlog = cmd.backlog > 0 && cmd.backlog < max_backlog ?
1128 cmd.backlog : max_backlog;
1129 mutex_lock(&ctx->mutex);
1130 ret = rdma_listen(ctx->cm_id, ctx->backlog);
1131 mutex_unlock(&ctx->mutex);
1132 ucma_put_ctx(ctx);
1133 return ret;
1134}
1135
1136static ssize_t ucma_accept(struct ucma_file *file, const char __user *inbuf,
1137 int in_len, int out_len)
1138{
1139 struct rdma_ucm_accept cmd;
1140 struct rdma_conn_param conn_param;
1141 struct rdma_ucm_ece ece = {};
1142 struct ucma_context *ctx;
1143 size_t in_size;
1144 int ret;
1145
1146 if (in_len < offsetofend(typeof(cmd), reserved))
1147 return -EINVAL;
1148 in_size = min_t(size_t, in_len, sizeof(cmd));
1149 if (copy_from_user(&cmd, inbuf, in_size))
1150 return -EFAULT;
1151
1152 ctx = ucma_get_ctx_dev(file, cmd.id);
1153 if (IS_ERR(ctx))
1154 return PTR_ERR(ctx);
1155
1156 if (offsetofend(typeof(cmd), ece) <= in_size) {
1157 ece.vendor_id = cmd.ece.vendor_id;
1158 ece.attr_mod = cmd.ece.attr_mod;
1159 }
1160
1161 if (cmd.conn_param.valid) {
1162 ucma_copy_conn_param(ctx->cm_id, &conn_param, &cmd.conn_param);
1163 mutex_lock(&file->mut);
1164 mutex_lock(&ctx->mutex);
1165 ret = __rdma_accept_ece(ctx->cm_id, &conn_param, NULL, &ece);
1166 mutex_unlock(&ctx->mutex);
1167 if (!ret)
1168 ctx->uid = cmd.uid;
1169 mutex_unlock(&file->mut);
1170 } else {
1171 mutex_lock(&ctx->mutex);
1172 ret = __rdma_accept_ece(ctx->cm_id, NULL, NULL, &ece);
1173 mutex_unlock(&ctx->mutex);
1174 }
1175 ucma_put_ctx(ctx);
1176 return ret;
1177}
1178
1179static ssize_t ucma_reject(struct ucma_file *file, const char __user *inbuf,
1180 int in_len, int out_len)
1181{
1182 struct rdma_ucm_reject cmd;
1183 struct ucma_context *ctx;
1184 int ret;
1185
1186 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1187 return -EFAULT;
1188
1189 if (!cmd.reason)
1190 cmd.reason = IB_CM_REJ_CONSUMER_DEFINED;
1191
1192 switch (cmd.reason) {
1193 case IB_CM_REJ_CONSUMER_DEFINED:
1194 case IB_CM_REJ_VENDOR_OPTION_NOT_SUPPORTED:
1195 break;
1196 default:
1197 return -EINVAL;
1198 }
1199
1200 ctx = ucma_get_ctx_dev(file, cmd.id);
1201 if (IS_ERR(ctx))
1202 return PTR_ERR(ctx);
1203
1204 mutex_lock(&ctx->mutex);
1205 ret = rdma_reject(ctx->cm_id, cmd.private_data, cmd.private_data_len,
1206 cmd.reason);
1207 mutex_unlock(&ctx->mutex);
1208 ucma_put_ctx(ctx);
1209 return ret;
1210}
1211
1212static ssize_t ucma_disconnect(struct ucma_file *file, const char __user *inbuf,
1213 int in_len, int out_len)
1214{
1215 struct rdma_ucm_disconnect cmd;
1216 struct ucma_context *ctx;
1217 int ret;
1218
1219 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1220 return -EFAULT;
1221
1222 ctx = ucma_get_ctx_dev(file, cmd.id);
1223 if (IS_ERR(ctx))
1224 return PTR_ERR(ctx);
1225
1226 mutex_lock(&ctx->mutex);
1227 ret = rdma_disconnect(ctx->cm_id);
1228 mutex_unlock(&ctx->mutex);
1229 ucma_put_ctx(ctx);
1230 return ret;
1231}
1232
1233static ssize_t ucma_init_qp_attr(struct ucma_file *file,
1234 const char __user *inbuf,
1235 int in_len, int out_len)
1236{
1237 struct rdma_ucm_init_qp_attr cmd;
1238 struct ib_uverbs_qp_attr resp;
1239 struct ucma_context *ctx;
1240 struct ib_qp_attr qp_attr;
1241 int ret;
1242
1243 if (out_len < sizeof(resp))
1244 return -ENOSPC;
1245
1246 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1247 return -EFAULT;
1248
1249 if (cmd.qp_state > IB_QPS_ERR)
1250 return -EINVAL;
1251
1252 ctx = ucma_get_ctx_dev(file, cmd.id);
1253 if (IS_ERR(ctx))
1254 return PTR_ERR(ctx);
1255
1256 resp.qp_attr_mask = 0;
1257 memset(&qp_attr, 0, sizeof qp_attr);
1258 qp_attr.qp_state = cmd.qp_state;
1259 mutex_lock(&ctx->mutex);
1260 ret = rdma_init_qp_attr(ctx->cm_id, &qp_attr, &resp.qp_attr_mask);
1261 mutex_unlock(&ctx->mutex);
1262 if (ret)
1263 goto out;
1264
1265 ib_copy_qp_attr_to_user(ctx->cm_id->device, &resp, &qp_attr);
1266 if (copy_to_user(u64_to_user_ptr(cmd.response),
1267 &resp, sizeof(resp)))
1268 ret = -EFAULT;
1269
1270out:
1271 ucma_put_ctx(ctx);
1272 return ret;
1273}
1274
1275static int ucma_set_option_id(struct ucma_context *ctx, int optname,
1276 void *optval, size_t optlen)
1277{
1278 int ret = 0;
1279
1280 switch (optname) {
1281 case RDMA_OPTION_ID_TOS:
1282 if (optlen != sizeof(u8)) {
1283 ret = -EINVAL;
1284 break;
1285 }
1286 rdma_set_service_type(ctx->cm_id, *((u8 *) optval));
1287 break;
1288 case RDMA_OPTION_ID_REUSEADDR:
1289 if (optlen != sizeof(int)) {
1290 ret = -EINVAL;
1291 break;
1292 }
1293 ret = rdma_set_reuseaddr(ctx->cm_id, *((int *) optval) ? 1 : 0);
1294 break;
1295 case RDMA_OPTION_ID_AFONLY:
1296 if (optlen != sizeof(int)) {
1297 ret = -EINVAL;
1298 break;
1299 }
1300 ret = rdma_set_afonly(ctx->cm_id, *((int *) optval) ? 1 : 0);
1301 break;
1302 case RDMA_OPTION_ID_ACK_TIMEOUT:
1303 if (optlen != sizeof(u8)) {
1304 ret = -EINVAL;
1305 break;
1306 }
1307 ret = rdma_set_ack_timeout(ctx->cm_id, *((u8 *)optval));
1308 break;
1309 default:
1310 ret = -ENOSYS;
1311 }
1312
1313 return ret;
1314}
1315
1316static int ucma_set_ib_path(struct ucma_context *ctx,
1317 struct ib_path_rec_data *path_data, size_t optlen)
1318{
1319 struct sa_path_rec sa_path;
1320 struct rdma_cm_event event;
1321 int ret;
1322
1323 if (optlen % sizeof(*path_data))
1324 return -EINVAL;
1325
1326 for (; optlen; optlen -= sizeof(*path_data), path_data++) {
1327 if (path_data->flags == (IB_PATH_GMP | IB_PATH_PRIMARY |
1328 IB_PATH_BIDIRECTIONAL))
1329 break;
1330 }
1331
1332 if (!optlen)
1333 return -EINVAL;
1334
1335 if (!ctx->cm_id->device)
1336 return -EINVAL;
1337
1338 memset(&sa_path, 0, sizeof(sa_path));
1339
1340 sa_path.rec_type = SA_PATH_REC_TYPE_IB;
1341 ib_sa_unpack_path(path_data->path_rec, &sa_path);
1342
1343 if (rdma_cap_opa_ah(ctx->cm_id->device, ctx->cm_id->port_num)) {
1344 struct sa_path_rec opa;
1345
1346 sa_convert_path_ib_to_opa(&opa, &sa_path);
1347 mutex_lock(&ctx->mutex);
1348 ret = rdma_set_ib_path(ctx->cm_id, &opa);
1349 mutex_unlock(&ctx->mutex);
1350 } else {
1351 mutex_lock(&ctx->mutex);
1352 ret = rdma_set_ib_path(ctx->cm_id, &sa_path);
1353 mutex_unlock(&ctx->mutex);
1354 }
1355 if (ret)
1356 return ret;
1357
1358 memset(&event, 0, sizeof event);
1359 event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
1360 return ucma_event_handler(ctx->cm_id, &event);
1361}
1362
1363static int ucma_set_option_ib(struct ucma_context *ctx, int optname,
1364 void *optval, size_t optlen)
1365{
1366 int ret;
1367
1368 switch (optname) {
1369 case RDMA_OPTION_IB_PATH:
1370 ret = ucma_set_ib_path(ctx, optval, optlen);
1371 break;
1372 default:
1373 ret = -ENOSYS;
1374 }
1375
1376 return ret;
1377}
1378
1379static int ucma_set_option_level(struct ucma_context *ctx, int level,
1380 int optname, void *optval, size_t optlen)
1381{
1382 int ret;
1383
1384 switch (level) {
1385 case RDMA_OPTION_ID:
1386 mutex_lock(&ctx->mutex);
1387 ret = ucma_set_option_id(ctx, optname, optval, optlen);
1388 mutex_unlock(&ctx->mutex);
1389 break;
1390 case RDMA_OPTION_IB:
1391 ret = ucma_set_option_ib(ctx, optname, optval, optlen);
1392 break;
1393 default:
1394 ret = -ENOSYS;
1395 }
1396
1397 return ret;
1398}
1399
1400static ssize_t ucma_set_option(struct ucma_file *file, const char __user *inbuf,
1401 int in_len, int out_len)
1402{
1403 struct rdma_ucm_set_option cmd;
1404 struct ucma_context *ctx;
1405 void *optval;
1406 int ret;
1407
1408 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1409 return -EFAULT;
1410
1411 if (unlikely(cmd.optlen > KMALLOC_MAX_SIZE))
1412 return -EINVAL;
1413
1414 ctx = ucma_get_ctx(file, cmd.id);
1415 if (IS_ERR(ctx))
1416 return PTR_ERR(ctx);
1417
1418 optval = memdup_user(u64_to_user_ptr(cmd.optval),
1419 cmd.optlen);
1420 if (IS_ERR(optval)) {
1421 ret = PTR_ERR(optval);
1422 goto out;
1423 }
1424
1425 ret = ucma_set_option_level(ctx, cmd.level, cmd.optname, optval,
1426 cmd.optlen);
1427 kfree(optval);
1428
1429out:
1430 ucma_put_ctx(ctx);
1431 return ret;
1432}
1433
1434static ssize_t ucma_notify(struct ucma_file *file, const char __user *inbuf,
1435 int in_len, int out_len)
1436{
1437 struct rdma_ucm_notify cmd;
1438 struct ucma_context *ctx;
1439 int ret = -EINVAL;
1440
1441 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1442 return -EFAULT;
1443
1444 ctx = ucma_get_ctx(file, cmd.id);
1445 if (IS_ERR(ctx))
1446 return PTR_ERR(ctx);
1447
1448 mutex_lock(&ctx->mutex);
1449 if (ctx->cm_id->device)
1450 ret = rdma_notify(ctx->cm_id, (enum ib_event_type)cmd.event);
1451 mutex_unlock(&ctx->mutex);
1452
1453 ucma_put_ctx(ctx);
1454 return ret;
1455}
1456
1457static ssize_t ucma_process_join(struct ucma_file *file,
1458 struct rdma_ucm_join_mcast *cmd, int out_len)
1459{
1460 struct rdma_ucm_create_id_resp resp;
1461 struct ucma_context *ctx;
1462 struct ucma_multicast *mc;
1463 struct sockaddr *addr;
1464 int ret;
1465 u8 join_state;
1466
1467 if (out_len < sizeof(resp))
1468 return -ENOSPC;
1469
1470 addr = (struct sockaddr *) &cmd->addr;
1471 if (cmd->addr_size != rdma_addr_size(addr))
1472 return -EINVAL;
1473
1474 if (cmd->join_flags == RDMA_MC_JOIN_FLAG_FULLMEMBER)
1475 join_state = BIT(FULLMEMBER_JOIN);
1476 else if (cmd->join_flags == RDMA_MC_JOIN_FLAG_SENDONLY_FULLMEMBER)
1477 join_state = BIT(SENDONLY_FULLMEMBER_JOIN);
1478 else
1479 return -EINVAL;
1480
1481 ctx = ucma_get_ctx_dev(file, cmd->id);
1482 if (IS_ERR(ctx))
1483 return PTR_ERR(ctx);
1484
1485 mutex_lock(&file->mut);
1486 mc = ucma_alloc_multicast(ctx);
1487 if (!mc) {
1488 ret = -ENOMEM;
1489 goto err1;
1490 }
1491 mc->join_state = join_state;
1492 mc->uid = cmd->uid;
1493 memcpy(&mc->addr, addr, cmd->addr_size);
1494 mutex_lock(&ctx->mutex);
1495 ret = rdma_join_multicast(ctx->cm_id, (struct sockaddr *)&mc->addr,
1496 join_state, mc);
1497 mutex_unlock(&ctx->mutex);
1498 if (ret)
1499 goto err2;
1500
1501 resp.id = mc->id;
1502 if (copy_to_user(u64_to_user_ptr(cmd->response),
1503 &resp, sizeof(resp))) {
1504 ret = -EFAULT;
1505 goto err3;
1506 }
1507
1508 xa_store(&multicast_table, mc->id, mc, 0);
1509
1510 mutex_unlock(&file->mut);
1511 ucma_put_ctx(ctx);
1512 return 0;
1513
1514err3:
1515 rdma_leave_multicast(ctx->cm_id, (struct sockaddr *) &mc->addr);
1516 ucma_cleanup_mc_events(mc);
1517err2:
1518 xa_erase(&multicast_table, mc->id);
1519 list_del(&mc->list);
1520 kfree(mc);
1521err1:
1522 mutex_unlock(&file->mut);
1523 ucma_put_ctx(ctx);
1524 return ret;
1525}
1526
1527static ssize_t ucma_join_ip_multicast(struct ucma_file *file,
1528 const char __user *inbuf,
1529 int in_len, int out_len)
1530{
1531 struct rdma_ucm_join_ip_mcast cmd;
1532 struct rdma_ucm_join_mcast join_cmd;
1533
1534 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1535 return -EFAULT;
1536
1537 join_cmd.response = cmd.response;
1538 join_cmd.uid = cmd.uid;
1539 join_cmd.id = cmd.id;
1540 join_cmd.addr_size = rdma_addr_size_in6(&cmd.addr);
1541 if (!join_cmd.addr_size)
1542 return -EINVAL;
1543
1544 join_cmd.join_flags = RDMA_MC_JOIN_FLAG_FULLMEMBER;
1545 memcpy(&join_cmd.addr, &cmd.addr, join_cmd.addr_size);
1546
1547 return ucma_process_join(file, &join_cmd, out_len);
1548}
1549
1550static ssize_t ucma_join_multicast(struct ucma_file *file,
1551 const char __user *inbuf,
1552 int in_len, int out_len)
1553{
1554 struct rdma_ucm_join_mcast cmd;
1555
1556 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1557 return -EFAULT;
1558
1559 if (!rdma_addr_size_kss(&cmd.addr))
1560 return -EINVAL;
1561
1562 return ucma_process_join(file, &cmd, out_len);
1563}
1564
1565static ssize_t ucma_leave_multicast(struct ucma_file *file,
1566 const char __user *inbuf,
1567 int in_len, int out_len)
1568{
1569 struct rdma_ucm_destroy_id cmd;
1570 struct rdma_ucm_destroy_id_resp resp;
1571 struct ucma_multicast *mc;
1572 int ret = 0;
1573
1574 if (out_len < sizeof(resp))
1575 return -ENOSPC;
1576
1577 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1578 return -EFAULT;
1579
1580 xa_lock(&multicast_table);
1581 mc = xa_load(&multicast_table, cmd.id);
1582 if (!mc)
1583 mc = ERR_PTR(-ENOENT);
1584 else if (mc->ctx->file != file)
1585 mc = ERR_PTR(-EINVAL);
1586 else if (!refcount_inc_not_zero(&mc->ctx->ref))
1587 mc = ERR_PTR(-ENXIO);
1588 else
1589 __xa_erase(&multicast_table, mc->id);
1590 xa_unlock(&multicast_table);
1591
1592 if (IS_ERR(mc)) {
1593 ret = PTR_ERR(mc);
1594 goto out;
1595 }
1596
1597 mutex_lock(&mc->ctx->mutex);
1598 rdma_leave_multicast(mc->ctx->cm_id, (struct sockaddr *) &mc->addr);
1599 mutex_unlock(&mc->ctx->mutex);
1600
1601 mutex_lock(&mc->ctx->file->mut);
1602 ucma_cleanup_mc_events(mc);
1603 list_del(&mc->list);
1604 mutex_unlock(&mc->ctx->file->mut);
1605
1606 ucma_put_ctx(mc->ctx);
1607 resp.events_reported = mc->events_reported;
1608 kfree(mc);
1609
1610 if (copy_to_user(u64_to_user_ptr(cmd.response),
1611 &resp, sizeof(resp)))
1612 ret = -EFAULT;
1613out:
1614 return ret;
1615}
1616
1617static void ucma_lock_files(struct ucma_file *file1, struct ucma_file *file2)
1618{
1619
1620 if (file1 < file2) {
1621 mutex_lock(&file1->mut);
1622 mutex_lock_nested(&file2->mut, SINGLE_DEPTH_NESTING);
1623 } else {
1624 mutex_lock(&file2->mut);
1625 mutex_lock_nested(&file1->mut, SINGLE_DEPTH_NESTING);
1626 }
1627}
1628
1629static void ucma_unlock_files(struct ucma_file *file1, struct ucma_file *file2)
1630{
1631 if (file1 < file2) {
1632 mutex_unlock(&file2->mut);
1633 mutex_unlock(&file1->mut);
1634 } else {
1635 mutex_unlock(&file1->mut);
1636 mutex_unlock(&file2->mut);
1637 }
1638}
1639
1640static void ucma_move_events(struct ucma_context *ctx, struct ucma_file *file)
1641{
1642 struct ucma_event *uevent, *tmp;
1643
1644 list_for_each_entry_safe(uevent, tmp, &ctx->file->event_list, list)
1645 if (uevent->ctx == ctx)
1646 list_move_tail(&uevent->list, &file->event_list);
1647}
1648
1649static ssize_t ucma_migrate_id(struct ucma_file *new_file,
1650 const char __user *inbuf,
1651 int in_len, int out_len)
1652{
1653 struct rdma_ucm_migrate_id cmd;
1654 struct rdma_ucm_migrate_resp resp;
1655 struct ucma_context *ctx;
1656 struct fd f;
1657 struct ucma_file *cur_file;
1658 int ret = 0;
1659
1660 if (copy_from_user(&cmd, inbuf, sizeof(cmd)))
1661 return -EFAULT;
1662
1663
1664 f = fdget(cmd.fd);
1665 if (!f.file)
1666 return -ENOENT;
1667 if (f.file->f_op != &ucma_fops) {
1668 ret = -EINVAL;
1669 goto file_put;
1670 }
1671
1672
1673 ctx = ucma_get_ctx(f.file->private_data, cmd.id);
1674 if (IS_ERR(ctx)) {
1675 ret = PTR_ERR(ctx);
1676 goto file_put;
1677 }
1678
1679 cur_file = ctx->file;
1680 if (cur_file == new_file) {
1681 resp.events_reported = ctx->events_reported;
1682 goto response;
1683 }
1684
1685
1686
1687
1688
1689 ucma_lock_files(cur_file, new_file);
1690 xa_lock(&ctx_table);
1691
1692 list_move_tail(&ctx->list, &new_file->ctx_list);
1693 ucma_move_events(ctx, new_file);
1694 ctx->file = new_file;
1695 resp.events_reported = ctx->events_reported;
1696
1697 xa_unlock(&ctx_table);
1698 ucma_unlock_files(cur_file, new_file);
1699
1700response:
1701 if (copy_to_user(u64_to_user_ptr(cmd.response),
1702 &resp, sizeof(resp)))
1703 ret = -EFAULT;
1704
1705 ucma_put_ctx(ctx);
1706file_put:
1707 fdput(f);
1708 return ret;
1709}
1710
1711static ssize_t (*ucma_cmd_table[])(struct ucma_file *file,
1712 const char __user *inbuf,
1713 int in_len, int out_len) = {
1714 [RDMA_USER_CM_CMD_CREATE_ID] = ucma_create_id,
1715 [RDMA_USER_CM_CMD_DESTROY_ID] = ucma_destroy_id,
1716 [RDMA_USER_CM_CMD_BIND_IP] = ucma_bind_ip,
1717 [RDMA_USER_CM_CMD_RESOLVE_IP] = ucma_resolve_ip,
1718 [RDMA_USER_CM_CMD_RESOLVE_ROUTE] = ucma_resolve_route,
1719 [RDMA_USER_CM_CMD_QUERY_ROUTE] = ucma_query_route,
1720 [RDMA_USER_CM_CMD_CONNECT] = ucma_connect,
1721 [RDMA_USER_CM_CMD_LISTEN] = ucma_listen,
1722 [RDMA_USER_CM_CMD_ACCEPT] = ucma_accept,
1723 [RDMA_USER_CM_CMD_REJECT] = ucma_reject,
1724 [RDMA_USER_CM_CMD_DISCONNECT] = ucma_disconnect,
1725 [RDMA_USER_CM_CMD_INIT_QP_ATTR] = ucma_init_qp_attr,
1726 [RDMA_USER_CM_CMD_GET_EVENT] = ucma_get_event,
1727 [RDMA_USER_CM_CMD_GET_OPTION] = NULL,
1728 [RDMA_USER_CM_CMD_SET_OPTION] = ucma_set_option,
1729 [RDMA_USER_CM_CMD_NOTIFY] = ucma_notify,
1730 [RDMA_USER_CM_CMD_JOIN_IP_MCAST] = ucma_join_ip_multicast,
1731 [RDMA_USER_CM_CMD_LEAVE_MCAST] = ucma_leave_multicast,
1732 [RDMA_USER_CM_CMD_MIGRATE_ID] = ucma_migrate_id,
1733 [RDMA_USER_CM_CMD_QUERY] = ucma_query,
1734 [RDMA_USER_CM_CMD_BIND] = ucma_bind,
1735 [RDMA_USER_CM_CMD_RESOLVE_ADDR] = ucma_resolve_addr,
1736 [RDMA_USER_CM_CMD_JOIN_MCAST] = ucma_join_multicast
1737};
1738
1739static ssize_t ucma_write(struct file *filp, const char __user *buf,
1740 size_t len, loff_t *pos)
1741{
1742 struct ucma_file *file = filp->private_data;
1743 struct rdma_ucm_cmd_hdr hdr;
1744 ssize_t ret;
1745
1746 if (!ib_safe_file_access(filp)) {
1747 pr_err_once("ucma_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
1748 task_tgid_vnr(current), current->comm);
1749 return -EACCES;
1750 }
1751
1752 if (len < sizeof(hdr))
1753 return -EINVAL;
1754
1755 if (copy_from_user(&hdr, buf, sizeof(hdr)))
1756 return -EFAULT;
1757
1758 if (hdr.cmd >= ARRAY_SIZE(ucma_cmd_table))
1759 return -EINVAL;
1760 hdr.cmd = array_index_nospec(hdr.cmd, ARRAY_SIZE(ucma_cmd_table));
1761
1762 if (hdr.in + sizeof(hdr) > len)
1763 return -EINVAL;
1764
1765 if (!ucma_cmd_table[hdr.cmd])
1766 return -ENOSYS;
1767
1768 ret = ucma_cmd_table[hdr.cmd](file, buf + sizeof(hdr), hdr.in, hdr.out);
1769 if (!ret)
1770 ret = len;
1771
1772 return ret;
1773}
1774
1775static __poll_t ucma_poll(struct file *filp, struct poll_table_struct *wait)
1776{
1777 struct ucma_file *file = filp->private_data;
1778 __poll_t mask = 0;
1779
1780 poll_wait(filp, &file->poll_wait, wait);
1781
1782 if (!list_empty(&file->event_list))
1783 mask = EPOLLIN | EPOLLRDNORM;
1784
1785 return mask;
1786}
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796static int ucma_open(struct inode *inode, struct file *filp)
1797{
1798 struct ucma_file *file;
1799
1800 file = kmalloc(sizeof *file, GFP_KERNEL);
1801 if (!file)
1802 return -ENOMEM;
1803
1804 file->close_wq = alloc_ordered_workqueue("ucma_close_id",
1805 WQ_MEM_RECLAIM);
1806 if (!file->close_wq) {
1807 kfree(file);
1808 return -ENOMEM;
1809 }
1810
1811 INIT_LIST_HEAD(&file->event_list);
1812 INIT_LIST_HEAD(&file->ctx_list);
1813 init_waitqueue_head(&file->poll_wait);
1814 mutex_init(&file->mut);
1815
1816 filp->private_data = file;
1817 file->filp = filp;
1818
1819 return stream_open(inode, filp);
1820}
1821
1822static int ucma_close(struct inode *inode, struct file *filp)
1823{
1824 struct ucma_file *file = filp->private_data;
1825 struct ucma_context *ctx, *tmp;
1826
1827 mutex_lock(&file->mut);
1828 list_for_each_entry_safe(ctx, tmp, &file->ctx_list, list) {
1829 ctx->destroying = 1;
1830 mutex_unlock(&file->mut);
1831
1832 xa_erase(&ctx_table, ctx->id);
1833 flush_workqueue(file->close_wq);
1834
1835
1836
1837
1838 xa_lock(&ctx_table);
1839 if (!ctx->closing) {
1840 xa_unlock(&ctx_table);
1841 ucma_put_ctx(ctx);
1842 wait_for_completion(&ctx->comp);
1843
1844
1845
1846 rdma_destroy_id(ctx->cm_id);
1847 } else {
1848 xa_unlock(&ctx_table);
1849 }
1850
1851 ucma_free_ctx(ctx);
1852 mutex_lock(&file->mut);
1853 }
1854 mutex_unlock(&file->mut);
1855 destroy_workqueue(file->close_wq);
1856 kfree(file);
1857 return 0;
1858}
1859
1860static const struct file_operations ucma_fops = {
1861 .owner = THIS_MODULE,
1862 .open = ucma_open,
1863 .release = ucma_close,
1864 .write = ucma_write,
1865 .poll = ucma_poll,
1866 .llseek = no_llseek,
1867};
1868
1869static struct miscdevice ucma_misc = {
1870 .minor = MISC_DYNAMIC_MINOR,
1871 .name = "rdma_cm",
1872 .nodename = "infiniband/rdma_cm",
1873 .mode = 0666,
1874 .fops = &ucma_fops,
1875};
1876
1877static int ucma_get_global_nl_info(struct ib_client_nl_info *res)
1878{
1879 res->abi = RDMA_USER_CM_ABI_VERSION;
1880 res->cdev = ucma_misc.this_device;
1881 return 0;
1882}
1883
1884static struct ib_client rdma_cma_client = {
1885 .name = "rdma_cm",
1886 .get_global_nl_info = ucma_get_global_nl_info,
1887};
1888MODULE_ALIAS_RDMA_CLIENT("rdma_cm");
1889
1890static ssize_t show_abi_version(struct device *dev,
1891 struct device_attribute *attr,
1892 char *buf)
1893{
1894 return sprintf(buf, "%d\n", RDMA_USER_CM_ABI_VERSION);
1895}
1896static DEVICE_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
1897
1898static int __init ucma_init(void)
1899{
1900 int ret;
1901
1902 ret = misc_register(&ucma_misc);
1903 if (ret)
1904 return ret;
1905
1906 ret = device_create_file(ucma_misc.this_device, &dev_attr_abi_version);
1907 if (ret) {
1908 pr_err("rdma_ucm: couldn't create abi_version attr\n");
1909 goto err1;
1910 }
1911
1912 ucma_ctl_table_hdr = register_net_sysctl(&init_net, "net/rdma_ucm", ucma_ctl_table);
1913 if (!ucma_ctl_table_hdr) {
1914 pr_err("rdma_ucm: couldn't register sysctl paths\n");
1915 ret = -ENOMEM;
1916 goto err2;
1917 }
1918
1919 ret = ib_register_client(&rdma_cma_client);
1920 if (ret)
1921 goto err3;
1922
1923 return 0;
1924err3:
1925 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1926err2:
1927 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1928err1:
1929 misc_deregister(&ucma_misc);
1930 return ret;
1931}
1932
1933static void __exit ucma_cleanup(void)
1934{
1935 ib_unregister_client(&rdma_cma_client);
1936 unregister_net_sysctl_table(ucma_ctl_table_hdr);
1937 device_remove_file(ucma_misc.this_device, &dev_attr_abi_version);
1938 misc_deregister(&ucma_misc);
1939}
1940
1941module_init(ucma_init);
1942module_exit(ucma_cleanup);
1943
