1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause OR GPL-2.0
3 *
4 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
5 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
6 * Copyright (c) 1999-2019, Mellanox Technologies, Inc. All rights reserved.
7 * Copyright (c) 2005 Intel Corporation. All rights reserved.
8 *
9 * This software is available to you under a choice of one of two
10 * licenses. You may choose to be licensed under the terms of the GNU
11 * General Public License (GPL) Version 2, available from the file
12 * COPYING in the main directory of this source tree, or the
13 * OpenIB.org BSD license below:
14 *
15 * Redistribution and use in source and binary forms, with or
16 * without modification, are permitted provided that the following
17 * conditions are met:
18 *
19 * - Redistributions of source code must retain the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer.
22 *
23 * - Redistributions in binary form must reproduce the above
24 * copyright notice, this list of conditions and the following
25 * disclaimer in the documentation and/or other materials
26 * provided with the distribution.
27 *
28 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
29 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
30 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
31 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
32 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
33 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
34 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * SOFTWARE.
36 */
37
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
40
41 #include <linux/mutex.h>
42 #include <linux/slab.h>
43 #include <linux/workqueue.h>
44 #include <linux/module.h>
45 #include <net/if_llatbl.h>
46 #include <net/route.h>
47 #include <net/route/nhop.h>
48 #include <net/netevent.h>
49 #include <rdma/ib_addr.h>
50 #include <rdma/ib.h>
51
52 #include <netinet/in_fib.h>
53 #include <netinet/if_ether.h>
54 #include <netinet/ip_var.h>
55 #include <netinet6/scope6_var.h>
56 #include <netinet6/in6_pcb.h>
57 #include <netinet6/in6_fib.h>
58
59 #include "core_priv.h"
60
61 struct addr_req {
62 struct list_head list;
63 struct sockaddr_storage src_addr;
64 struct sockaddr_storage dst_addr;
65 struct rdma_dev_addr *addr;
66 struct rdma_addr_client *client;
67 void *context;
68 void (*callback)(int status, struct sockaddr *src_addr,
69 struct rdma_dev_addr *addr, void *context);
70 int timeout;
71 int status;
72 };
73
74 static void process_req(struct work_struct *work);
75
76 static DEFINE_MUTEX(lock);
77 static LIST_HEAD(req_list);
78 static DECLARE_DELAYED_WORK(work, process_req);
79 static struct workqueue_struct *addr_wq;
80
81 int rdma_addr_size(struct sockaddr *addr)
82 {
83 switch (addr->sa_family) {
84 case AF_INET:
85 return sizeof(struct sockaddr_in);
86 case AF_INET6:
87 return sizeof(struct sockaddr_in6);
88 case AF_IB:
89 return sizeof(struct sockaddr_ib);
90 default:
91 return 0;
92 }
93 }
94 EXPORT_SYMBOL(rdma_addr_size);
95
96 int rdma_addr_size_in6(struct sockaddr_in6 *addr)
97 {
98 int ret = rdma_addr_size((struct sockaddr *) addr);
99
100 return ret <= sizeof(*addr) ? ret : 0;
101 }
102 EXPORT_SYMBOL(rdma_addr_size_in6);
103
104 int rdma_addr_size_kss(struct sockaddr_storage *addr)
105 {
106 int ret = rdma_addr_size((struct sockaddr *) addr);
107
108 return ret <= sizeof(*addr) ? ret : 0;
109 }
110 EXPORT_SYMBOL(rdma_addr_size_kss);
111
112 static struct rdma_addr_client self;
113
114 void rdma_addr_register_client(struct rdma_addr_client *client)
115 {
116 atomic_set(&client->refcount, 1);
117 init_completion(&client->comp);
118 }
119 EXPORT_SYMBOL(rdma_addr_register_client);
120
121 static inline void put_client(struct rdma_addr_client *client)
122 {
123 if (atomic_dec_and_test(&client->refcount))
124 complete(&client->comp);
125 }
126
127 void rdma_addr_unregister_client(struct rdma_addr_client *client)
128 {
129 put_client(client);
130 wait_for_completion(&client->comp);
131 }
132 EXPORT_SYMBOL(rdma_addr_unregister_client);
133
134 static inline void
135 rdma_copy_addr_sub(u8 *dst, const u8 *src, unsigned min, unsigned max)
136 {
137 if (min > max)
138 min = max;
139 memcpy(dst, src, min);
140 memset(dst + min, 0, max - min);
141 }
142
143 int rdma_copy_addr(struct rdma_dev_addr *dev_addr, struct ifnet *dev,
144 const unsigned char *dst_dev_addr)
145 {
146 /* check for loopback device */
147 if (dev->if_flags & IFF_LOOPBACK) {
148 dev_addr->dev_type = ARPHRD_ETHER;
149 memset(dev_addr->src_dev_addr, 0, MAX_ADDR_LEN);
150 memset(dev_addr->broadcast, 0, MAX_ADDR_LEN);
151 memset(dev_addr->dst_dev_addr, 0, MAX_ADDR_LEN);
152 dev_addr->bound_dev_if = dev->if_index;
153 return (0);
154 } else if (dev->if_type == IFT_INFINIBAND)
155 dev_addr->dev_type = ARPHRD_INFINIBAND;
156 else if (dev->if_type == IFT_ETHER || dev->if_type == IFT_L2VLAN)
157 dev_addr->dev_type = ARPHRD_ETHER;
158 else
159 dev_addr->dev_type = 0;
160 rdma_copy_addr_sub(dev_addr->src_dev_addr, IF_LLADDR(dev),
161 dev->if_addrlen, MAX_ADDR_LEN);
162 rdma_copy_addr_sub(dev_addr->broadcast, dev->if_broadcastaddr,
163 dev->if_addrlen, MAX_ADDR_LEN);
164 if (dst_dev_addr != NULL) {
165 rdma_copy_addr_sub(dev_addr->dst_dev_addr, dst_dev_addr,
166 dev->if_addrlen, MAX_ADDR_LEN);
167 }
168 dev_addr->bound_dev_if = dev->if_index;
169 return 0;
170 }
171 EXPORT_SYMBOL(rdma_copy_addr);
172
173 int rdma_translate_ip(const struct sockaddr *addr,
174 struct rdma_dev_addr *dev_addr)
175 {
176 struct ifnet *dev;
177 int ret;
178
179 if (dev_addr->bound_dev_if) {
180 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
181 } else switch (addr->sa_family) {
182 #ifdef INET
183 case AF_INET:
184 dev = ip_ifp_find(dev_addr->net,
185 ((const struct sockaddr_in *)addr)->sin_addr.s_addr);
186 break;
187 #endif
188 #ifdef INET6
189 case AF_INET6:
190 dev = ip6_ifp_find(dev_addr->net,
191 ((const struct sockaddr_in6 *)addr)->sin6_addr, 0);
192 break;
193 #endif
194 default:
195 dev = NULL;
196 break;
197 }
198
199 if (dev != NULL) {
200 /* disallow connections through 127.0.0.1 itself */
201 if (dev->if_flags & IFF_LOOPBACK)
202 ret = -EINVAL;
203 else
204 ret = rdma_copy_addr(dev_addr, dev, NULL);
205 dev_put(dev);
206 } else {
207 ret = -ENODEV;
208 }
209 return ret;
210 }
211 EXPORT_SYMBOL(rdma_translate_ip);
212
213 static void set_timeout(int time)
214 {
215 int delay; /* under FreeBSD ticks are 32-bit */
216
217 delay = time - jiffies;
218 if (delay <= 0)
219 delay = 1;
220 else if (delay > hz)
221 delay = hz;
222
223 mod_delayed_work(addr_wq, &work, delay);
224 }
225
226 static void queue_req(struct addr_req *req)
227 {
228 struct addr_req *temp_req;
229
230 mutex_lock(&lock);
231 list_for_each_entry_reverse(temp_req, &req_list, list) {
232 if (time_after_eq(req->timeout, temp_req->timeout))
233 break;
234 }
235
236 list_add(&req->list, &temp_req->list);
237
238 if (req_list.next == &req->list)
239 set_timeout(req->timeout);
240 mutex_unlock(&lock);
241 }
242
243 #if defined(INET) || defined(INET6)
244 static int addr_resolve_multi(u8 *edst, struct ifnet *ifp, struct sockaddr *dst_in)
245 {
246 struct sockaddr *llsa;
247 struct sockaddr_dl sdl;
248 int error;
249
250 sdl.sdl_len = sizeof(sdl);
251 llsa = (struct sockaddr *)&sdl;
252
253 if (ifp->if_resolvemulti == NULL) {
254 error = EOPNOTSUPP;
255 } else {
256 error = ifp->if_resolvemulti(ifp, &llsa, dst_in);
257 if (error == 0) {
258 rdma_copy_addr_sub(edst, LLADDR((struct sockaddr_dl *)llsa),
259 ifp->if_addrlen, MAX_ADDR_LEN);
260 }
261 }
262 return (error);
263 }
264 #endif
265
266 #ifdef INET
267 static int addr4_resolve(struct sockaddr_in *src_in,
268 const struct sockaddr_in *dst_in,
269 struct rdma_dev_addr *addr,
270 u8 *edst,
271 struct ifnet **ifpp)
272 {
273 enum {
274 ADDR_VALID = 0,
275 ADDR_SRC_ANY = 1,
276 ADDR_DST_ANY = 2,
277 };
278 struct sockaddr_in dst_tmp = *dst_in;
279 in_port_t src_port;
280 struct sockaddr *saddr = NULL;
281 struct nhop_object *nh;
282 struct ifnet *ifp;
283 int error;
284 int type;
285
286 NET_EPOCH_ASSERT();
287
288 /* set VNET, if any */
289 CURVNET_SET(addr->net);
290
291 /* set default TTL limit */
292 addr->hoplimit = V_ip_defttl;
293
294 type = ADDR_VALID;
295 if (src_in->sin_addr.s_addr == INADDR_ANY)
296 type |= ADDR_SRC_ANY;
297 if (dst_tmp.sin_addr.s_addr == INADDR_ANY)
298 type |= ADDR_DST_ANY;
299
300 /*
301 * Make sure the socket address length field is set.
302 */
303 dst_tmp.sin_len = sizeof(dst_tmp);
304
305 /* Step 1 - lookup destination route if any */
306 switch (type) {
307 case ADDR_VALID:
308 case ADDR_SRC_ANY:
309 /* regular destination route lookup */
310 nh = fib4_lookup(RT_DEFAULT_FIB, dst_tmp.sin_addr,0,NHR_NONE,0);
311 if (nh == NULL) {
312 error = EHOSTUNREACH;
313 goto done;
314 }
315 break;
316 default:
317 error = ENETUNREACH;
318 goto done;
319 }
320
321 /* Step 2 - find outgoing network interface */
322 switch (type) {
323 case ADDR_VALID:
324 /* get source interface */
325 if (addr->bound_dev_if != 0) {
326 ifp = dev_get_by_index(addr->net, addr->bound_dev_if);
327 } else {
328 ifp = ip_ifp_find(addr->net, src_in->sin_addr.s_addr);
329 }
330
331 /* check source interface */
332 if (ifp == NULL) {
333 error = ENETUNREACH;
334 goto done;
335 } else if (ifp->if_flags & IFF_LOOPBACK) {
336 /*
337 * Source address cannot be a loopback device.
338 */
339 error = EHOSTUNREACH;
340 goto error_put_ifp;
341 } else if (nh->nh_ifp->if_flags & IFF_LOOPBACK) {
342 if (memcmp(&src_in->sin_addr, &dst_in->sin_addr,
343 sizeof(src_in->sin_addr))) {
344 /*
345 * Destination is loopback, but source
346 * and destination address is not the
347 * same.
348 */
349 error = EHOSTUNREACH;
350 goto error_put_ifp;
351 }
352 /* get destination network interface from route */
353 dev_put(ifp);
354 ifp = nh->nh_ifp;
355 dev_hold(ifp);
356 } else if (ifp != nh->nh_ifp) {
357 /*
358 * Source and destination interfaces are
359 * different.
360 */
361 error = ENETUNREACH;
362 goto error_put_ifp;
363 }
364 break;
365 case ADDR_SRC_ANY:
366 /* check for loopback device */
367 if (nh->nh_ifp->if_flags & IFF_LOOPBACK)
368 saddr = (struct sockaddr *)&dst_tmp;
369 else
370 saddr = nh->nh_ifa->ifa_addr;
371
372 /* get destination network interface from route */
373 ifp = nh->nh_ifp;
374 dev_hold(ifp);
375 break;
376 default:
377 break;
378 }
379
380 /*
381 * Step 3 - resolve destination MAC address
382 */
383 if (dst_tmp.sin_addr.s_addr == INADDR_BROADCAST) {
384 rdma_copy_addr_sub(edst, ifp->if_broadcastaddr,
385 ifp->if_addrlen, MAX_ADDR_LEN);
386 error = 0;
387 } else if (IN_MULTICAST(ntohl(dst_tmp.sin_addr.s_addr))) {
388 bool is_gw = (nh->nh_flags & NHF_GATEWAY) != 0;
389 error = addr_resolve_multi(edst, ifp, (struct sockaddr *)&dst_tmp);
390 if (error != 0)
391 goto error_put_ifp;
392 else if (is_gw)
393 addr->network = RDMA_NETWORK_IPV4;
394 } else if (ifp->if_flags & IFF_LOOPBACK) {
395 memset(edst, 0, MAX_ADDR_LEN);
396 error = 0;
397 } else {
398 bool is_gw = (nh->nh_flags & NHF_GATEWAY) != 0;
399 memset(edst, 0, MAX_ADDR_LEN);
400 #ifdef INET6
401 if (is_gw && nh->gw_sa.sa_family == AF_INET6)
402 error = nd6_resolve(ifp, LLE_SF(AF_INET, is_gw), NULL,
403 &nh->gw_sa, edst, NULL, NULL);
404 else
405 #endif
406 error = arpresolve(ifp, is_gw, NULL, is_gw ?
407 &nh->gw_sa : (const struct sockaddr *)&dst_tmp,
408 edst, NULL, NULL);
409
410 if (error != 0)
411 goto error_put_ifp;
412 else if (is_gw)
413 addr->network = RDMA_NETWORK_IPV4;
414 }
415
416 /*
417 * Step 4 - update source address, if any
418 */
419 if (saddr != NULL) {
420 src_port = src_in->sin_port;
421 memcpy(src_in, saddr, rdma_addr_size(saddr));
422 src_in->sin_port = src_port; /* preserve port number */
423 }
424
425 *ifpp = ifp;
426
427 goto done;
428
429 error_put_ifp:
430 dev_put(ifp);
431 done:
432 CURVNET_RESTORE();
433
434 if (error == EWOULDBLOCK || error == EAGAIN)
435 error = ENODATA;
436 return (-error);
437 }
438 #else
439 static int addr4_resolve(struct sockaddr_in *src_in,
440 const struct sockaddr_in *dst_in,
441 struct rdma_dev_addr *addr,
442 u8 *edst,
443 struct ifnet **ifpp)
444 {
445 return -EADDRNOTAVAIL;
446 }
447 #endif
448
449 #ifdef INET6
450 static int addr6_resolve(struct sockaddr_in6 *src_in,
451 const struct sockaddr_in6 *dst_in,
452 struct rdma_dev_addr *addr,
453 u8 *edst,
454 struct ifnet **ifpp)
455 {
456 enum {
457 ADDR_VALID = 0,
458 ADDR_SRC_ANY = 1,
459 ADDR_DST_ANY = 2,
460 };
461 struct sockaddr_in6 dst_tmp = *dst_in;
462 in_port_t src_port;
463 struct sockaddr *saddr = NULL;
464 struct nhop_object *nh;
465 struct ifnet *ifp;
466 int error;
467 int type;
468
469 NET_EPOCH_ASSERT();
470
471 /* set VNET, if any */
472 CURVNET_SET(addr->net);
473
474 /* set default TTL limit */
475 addr->hoplimit = V_ip_defttl;
476
477 type = ADDR_VALID;
478 if (ipv6_addr_any(&src_in->sin6_addr))
479 type |= ADDR_SRC_ANY;
480 if (ipv6_addr_any(&dst_tmp.sin6_addr))
481 type |= ADDR_DST_ANY;
482
483 /*
484 * Make sure the socket address length field is set.
485 */
486 dst_tmp.sin6_len = sizeof(dst_tmp);
487
488 /*
489 * Make sure the scope ID gets embedded, else nd6_resolve() will
490 * not find the record.
491 */
492 dst_tmp.sin6_scope_id = addr->bound_dev_if;
493 sa6_embedscope(&dst_tmp, 0);
494
495 /* Step 1 - lookup destination route if any */
496 switch (type) {
497 case ADDR_VALID:
498 /* sanity check for IPv4 addresses */
499 if (ipv6_addr_v4mapped(&src_in->sin6_addr) !=
500 ipv6_addr_v4mapped(&dst_tmp.sin6_addr)) {
501 error = EAFNOSUPPORT;
502 goto done;
503 }
504 /* FALLTHROUGH */
505 case ADDR_SRC_ANY:
506 /* regular destination route lookup */
507 nh = fib6_lookup(RT_DEFAULT_FIB, &dst_in->sin6_addr,
508 addr->bound_dev_if, NHR_NONE, 0);
509 if (nh == NULL) {
510 error = EHOSTUNREACH;
511 goto done;
512 }
513 break;
514 default:
515 error = ENETUNREACH;
516 goto done;
517 }
518
519 /* Step 2 - find outgoing network interface */
520 switch (type) {
521 case ADDR_VALID:
522 /* get source interface */
523 if (addr->bound_dev_if != 0) {
524 ifp = dev_get_by_index(addr->net, addr->bound_dev_if);
525 } else {
526 ifp = ip6_ifp_find(addr->net, src_in->sin6_addr, 0);
527 }
528
529 /* check source interface */
530 if (ifp == NULL) {
531 error = ENETUNREACH;
532 goto done;
533 } else if (ifp->if_flags & IFF_LOOPBACK) {
534 /*
535 * Source address cannot be a loopback device.
536 */
537 error = EHOSTUNREACH;
538 goto error_put_ifp;
539 } else if (nh->nh_ifp->if_flags & IFF_LOOPBACK) {
540 if (memcmp(&src_in->sin6_addr, &dst_in->sin6_addr,
541 sizeof(src_in->sin6_addr))) {
542 /*
543 * Destination is loopback, but source
544 * and destination address is not the
545 * same.
546 */
547 error = EHOSTUNREACH;
548 goto error_put_ifp;
549 }
550 /* get destination network interface from route */
551 dev_put(ifp);
552 ifp = nh->nh_ifp;
553 dev_hold(ifp);
554 } else if (ifp != nh->nh_ifp) {
555 /*
556 * Source and destination interfaces are
557 * different.
558 */
559 error = ENETUNREACH;
560 goto error_put_ifp;
561 }
562 break;
563 case ADDR_SRC_ANY:
564 /* check for loopback device */
565 if (nh->nh_ifp->if_flags & IFF_LOOPBACK)
566 saddr = (struct sockaddr *)&dst_tmp;
567 else
568 saddr = nh->nh_ifa->ifa_addr;
569
570 /* get destination network interface from route */
571 ifp = nh->nh_ifp;
572 dev_hold(ifp);
573 break;
574 default:
575 break;
576 }
577
578 /*
579 * Step 3 - resolve destination MAC address
580 */
581 if (IN6_IS_ADDR_MULTICAST(&dst_tmp.sin6_addr)) {
582 bool is_gw = (nh->nh_flags & NHF_GATEWAY) != 0;
583 error = addr_resolve_multi(edst, ifp,
584 (struct sockaddr *)&dst_tmp);
585 if (error != 0)
586 goto error_put_ifp;
587 else if (is_gw)
588 addr->network = RDMA_NETWORK_IPV6;
589 } else if (nh->nh_ifp->if_flags & IFF_LOOPBACK) {
590 memset(edst, 0, MAX_ADDR_LEN);
591 error = 0;
592 } else {
593 bool is_gw = (nh->nh_flags & NHF_GATEWAY) != 0;
594 memset(edst, 0, MAX_ADDR_LEN);
595 error = nd6_resolve(ifp, LLE_SF(AF_INET6, is_gw), NULL,
596 is_gw ? &nh->gw_sa : (const struct sockaddr *)&dst_tmp,
597 edst, NULL, NULL);
598 if (error != 0)
599 goto error_put_ifp;
600 else if (is_gw)
601 addr->network = RDMA_NETWORK_IPV6;
602 }
603
604 /*
605 * Step 4 - update source address, if any
606 */
607 if (saddr != NULL) {
608 src_port = src_in->sin6_port;
609 memcpy(src_in, saddr, rdma_addr_size(saddr));
610 src_in->sin6_port = src_port; /* preserve port number */
611 }
612
613 *ifpp = ifp;
614
615 goto done;
616
617 error_put_ifp:
618 dev_put(ifp);
619 done:
620 CURVNET_RESTORE();
621
622 if (error == EWOULDBLOCK || error == EAGAIN)
623 error = ENODATA;
624 return (-error);
625 }
626 #else
627 static int addr6_resolve(struct sockaddr_in6 *src_in,
628 const struct sockaddr_in6 *dst_in,
629 struct rdma_dev_addr *addr,
630 u8 *edst,
631 struct ifnet **ifpp)
632 {
633 return -EADDRNOTAVAIL;
634 }
635 #endif
636
637 static int addr_resolve_neigh(struct ifnet *dev,
638 const struct sockaddr *dst_in,
639 u8 *edst,
640 struct rdma_dev_addr *addr)
641 {
642 if (dev->if_flags & IFF_LOOPBACK) {
643 int ret;
644
645 /*
646 * Binding to a loopback device is not allowed. Make
647 * sure the destination device address is global by
648 * clearing the bound device interface:
649 */
650 if (addr->bound_dev_if == dev->if_index)
651 addr->bound_dev_if = 0;
652
653 ret = rdma_translate_ip(dst_in, addr);
654 if (ret == 0) {
655 memcpy(addr->dst_dev_addr, addr->src_dev_addr,
656 MAX_ADDR_LEN);
657 }
658 return ret;
659 }
660
661 /* If the device doesn't do ARP internally */
662 if (!(dev->if_flags & IFF_NOARP))
663 return rdma_copy_addr(addr, dev, edst);
664
665 return rdma_copy_addr(addr, dev, NULL);
666 }
667
668 static int addr_resolve(struct sockaddr *src_in,
669 const struct sockaddr *dst_in,
670 struct rdma_dev_addr *addr)
671 {
672 struct epoch_tracker et;
673 struct ifnet *ndev = NULL;
674 u8 edst[MAX_ADDR_LEN];
675 int ret;
676
677 if (dst_in->sa_family != src_in->sa_family)
678 return -EINVAL;
679
680 NET_EPOCH_ENTER(et);
681 switch (src_in->sa_family) {
682 case AF_INET:
683 ret = addr4_resolve((struct sockaddr_in *)src_in,
684 (const struct sockaddr_in *)dst_in,
685 addr, edst, &ndev);
686 break;
687 case AF_INET6:
688 ret = addr6_resolve((struct sockaddr_in6 *)src_in,
689 (const struct sockaddr_in6 *)dst_in, addr,
690 edst, &ndev);
691 break;
692 default:
693 ret = -EADDRNOTAVAIL;
694 break;
695 }
696 NET_EPOCH_EXIT(et);
697
698 /* check for error */
699 if (ret != 0)
700 return ret;
701
702 /* store MAC addresses and check for loopback */
703 ret = addr_resolve_neigh(ndev, dst_in, edst, addr);
704
705 /* set belonging VNET, if any */
706 addr->net = dev_net(ndev);
707 dev_put(ndev);
708
709 return ret;
710 }
711
712 static void process_req(struct work_struct *work)
713 {
714 struct addr_req *req, *temp_req;
715 struct sockaddr *src_in, *dst_in;
716 struct list_head done_list;
717
718 INIT_LIST_HEAD(&done_list);
719
720 mutex_lock(&lock);
721 list_for_each_entry_safe(req, temp_req, &req_list, list) {
722 if (req->status == -ENODATA) {
723 src_in = (struct sockaddr *) &req->src_addr;
724 dst_in = (struct sockaddr *) &req->dst_addr;
725 req->status = addr_resolve(src_in, dst_in, req->addr);
726 if (req->status && time_after_eq(jiffies, req->timeout))
727 req->status = -ETIMEDOUT;
728 else if (req->status == -ENODATA)
729 continue;
730 }
731 list_move_tail(&req->list, &done_list);
732 }
733
734 if (!list_empty(&req_list)) {
735 req = list_entry(req_list.next, struct addr_req, list);
736 set_timeout(req->timeout);
737 }
738 mutex_unlock(&lock);
739
740 list_for_each_entry_safe(req, temp_req, &done_list, list) {
741 list_del(&req->list);
742 req->callback(req->status, (struct sockaddr *) &req->src_addr,
743 req->addr, req->context);
744 put_client(req->client);
745 kfree(req);
746 }
747 }
748
749 int rdma_resolve_ip(struct rdma_addr_client *client,
750 struct sockaddr *src_addr, struct sockaddr *dst_addr,
751 struct rdma_dev_addr *addr, int timeout_ms,
752 void (*callback)(int status, struct sockaddr *src_addr,
753 struct rdma_dev_addr *addr, void *context),
754 void *context)
755 {
756 struct sockaddr *src_in, *dst_in;
757 struct addr_req *req;
758 int ret = 0;
759
760 req = kzalloc(sizeof *req, GFP_KERNEL);
761 if (!req)
762 return -ENOMEM;
763
764 src_in = (struct sockaddr *) &req->src_addr;
765 dst_in = (struct sockaddr *) &req->dst_addr;
766
767 if (src_addr) {
768 if (src_addr->sa_family != dst_addr->sa_family) {
769 ret = -EINVAL;
770 goto err;
771 }
772
773 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
774 } else {
775 src_in->sa_family = dst_addr->sa_family;
776 }
777
778 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
779 req->addr = addr;
780 req->callback = callback;
781 req->context = context;
782 req->client = client;
783 atomic_inc(&client->refcount);
784
785 req->status = addr_resolve(src_in, dst_in, addr);
786 switch (req->status) {
787 case 0:
788 req->timeout = jiffies;
789 queue_req(req);
790 break;
791 case -ENODATA:
792 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
793 queue_req(req);
794 break;
795 default:
796 ret = req->status;
797 atomic_dec(&client->refcount);
798 goto err;
799 }
800 return ret;
801 err:
802 kfree(req);
803 return ret;
804 }
805 EXPORT_SYMBOL(rdma_resolve_ip);
806
807 int rdma_resolve_ip_route(struct sockaddr *src_addr,
808 const struct sockaddr *dst_addr,
809 struct rdma_dev_addr *addr)
810 {
811 struct sockaddr_storage ssrc_addr = {};
812 struct sockaddr *src_in = (struct sockaddr *)&ssrc_addr;
813
814 if (src_addr) {
815 if (src_addr->sa_family != dst_addr->sa_family)
816 return -EINVAL;
817
818 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
819 } else {
820 src_in->sa_family = dst_addr->sa_family;
821 }
822
823 return addr_resolve(src_in, dst_addr, addr);
824 }
825 EXPORT_SYMBOL(rdma_resolve_ip_route);
826
827 void rdma_addr_cancel(struct rdma_dev_addr *addr)
828 {
829 struct addr_req *req, *temp_req;
830
831 mutex_lock(&lock);
832 list_for_each_entry_safe(req, temp_req, &req_list, list) {
833 if (req->addr == addr) {
834 req->status = -ECANCELED;
835 req->timeout = jiffies;
836 list_move(&req->list, &req_list);
837 set_timeout(req->timeout);
838 break;
839 }
840 }
841 mutex_unlock(&lock);
842 }
843 EXPORT_SYMBOL(rdma_addr_cancel);
844
845 struct resolve_cb_context {
846 struct rdma_dev_addr *addr;
847 struct completion comp;
848 int status;
849 };
850
851 static void resolve_cb(int status, struct sockaddr *src_addr,
852 struct rdma_dev_addr *addr, void *context)
853 {
854 if (!status)
855 memcpy(((struct resolve_cb_context *)context)->addr,
856 addr, sizeof(struct rdma_dev_addr));
857 ((struct resolve_cb_context *)context)->status = status;
858 complete(&((struct resolve_cb_context *)context)->comp);
859 }
860
861 int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
862 const union ib_gid *dgid,
863 u8 *dmac, struct ifnet *dev,
864 int *hoplimit)
865 {
866 int ret = 0;
867 struct rdma_dev_addr dev_addr;
868 struct resolve_cb_context ctx;
869
870 union rdma_sockaddr sgid_addr, dgid_addr;
871
872 rdma_gid2ip(&sgid_addr._sockaddr, sgid);
873 rdma_gid2ip(&dgid_addr._sockaddr, dgid);
874
875 memset(&dev_addr, 0, sizeof(dev_addr));
876
877 dev_addr.bound_dev_if = dev->if_index;
878 dev_addr.net = dev_net(dev);
879
880 ctx.addr = &dev_addr;
881 init_completion(&ctx.comp);
882 ret = rdma_resolve_ip(&self, &sgid_addr._sockaddr, &dgid_addr._sockaddr,
883 &dev_addr, 1000, resolve_cb, &ctx);
884 if (ret)
885 return ret;
886
887 wait_for_completion(&ctx.comp);
888
889 ret = ctx.status;
890 if (ret)
891 return ret;
892
893 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
894 if (hoplimit)
895 *hoplimit = dev_addr.hoplimit;
896 return ret;
897 }
898 EXPORT_SYMBOL(rdma_addr_find_l2_eth_by_grh);
899
900 int addr_init(void)
901 {
902 addr_wq = alloc_workqueue("ib_addr", WQ_MEM_RECLAIM, 0);
903 if (!addr_wq)
904 return -ENOMEM;
905
906 rdma_addr_register_client(&self);
907
908 return 0;
909 }
910
911 void addr_cleanup(void)
912 {
913 rdma_addr_unregister_client(&self);
914 destroy_workqueue(addr_wq);
915 }
Cache object: dc9529a2d91629ed680f8f7a3f3fda3a
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