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