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36#include <linux/mutex.h>
37#include <linux/inetdevice.h>
38#include <linux/slab.h>
39#include <linux/workqueue.h>
40#include <linux/module.h>
41#include <net/arp.h>
42#include <net/neighbour.h>
43#include <net/route.h>
44#include <net/netevent.h>
45#include <net/addrconf.h>
46#include <net/ip6_route.h>
47#include <rdma/ib_addr.h>
48#include <rdma/ib_sa.h>
49#include <rdma/ib.h>
50#include <rdma/rdma_netlink.h>
51#include <net/netlink.h>
52
53#include "core_priv.h"
54
55struct addr_req {
56 struct list_head list;
57 struct sockaddr_storage src_addr;
58 struct sockaddr_storage dst_addr;
59 struct rdma_dev_addr *addr;
60 void *context;
61 void (*callback)(int status, struct sockaddr *src_addr,
62 struct rdma_dev_addr *addr, void *context);
63 unsigned long timeout;
64 struct delayed_work work;
65 bool resolve_by_gid_attr;
66 int status;
67 u32 seq;
68};
69
70static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
71
72static DEFINE_SPINLOCK(lock);
73static LIST_HEAD(req_list);
74static struct workqueue_struct *addr_wq;
75
76static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
77 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
78 .len = sizeof(struct rdma_nla_ls_gid)},
79};
80
81static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
82{
83 struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
84 int ret;
85
86 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
87 return false;
88
89 ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
90 nlmsg_len(nlh), ib_nl_addr_policy);
91 if (ret)
92 return false;
93
94 return true;
95}
96
97static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
98{
99 const struct nlattr *head, *curr;
100 union ib_gid gid;
101 struct addr_req *req;
102 int len, rem;
103 int found = 0;
104
105 head = (const struct nlattr *)nlmsg_data(nlh);
106 len = nlmsg_len(nlh);
107
108 nla_for_each_attr(curr, head, len, rem) {
109 if (curr->nla_type == LS_NLA_TYPE_DGID)
110 memcpy(&gid, nla_data(curr), nla_len(curr));
111 }
112
113 spin_lock_bh(&lock);
114 list_for_each_entry(req, &req_list, list) {
115 if (nlh->nlmsg_seq != req->seq)
116 continue;
117
118 rdma_addr_set_dgid(req->addr, &gid);
119 req->status = 0;
120 found = 1;
121 break;
122 }
123 spin_unlock_bh(&lock);
124
125 if (!found)
126 pr_info("Couldn't find request waiting for DGID: %pI6\n",
127 &gid);
128}
129
130int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
131 struct nlmsghdr *nlh)
132{
133 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
134 !(NETLINK_CB(skb).sk))
135 return -EPERM;
136
137 if (ib_nl_is_good_ip_resp(nlh))
138 ib_nl_process_good_ip_rsep(nlh);
139
140 return skb->len;
141}
142
143static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
144 const void *daddr,
145 u32 seq, u16 family)
146{
147 struct sk_buff *skb = NULL;
148 struct nlmsghdr *nlh;
149 struct rdma_ls_ip_resolve_header *header;
150 void *data;
151 size_t size;
152 int attrtype;
153 int len;
154
155 if (family == AF_INET) {
156 size = sizeof(struct in_addr);
157 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
158 } else {
159 size = sizeof(struct in6_addr);
160 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
161 }
162
163 len = nla_total_size(sizeof(size));
164 len += NLMSG_ALIGN(sizeof(*header));
165
166 skb = nlmsg_new(len, GFP_KERNEL);
167 if (!skb)
168 return -ENOMEM;
169
170 data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
171 RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
172 if (!data) {
173 nlmsg_free(skb);
174 return -ENODATA;
175 }
176
177
178 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
179 header->ifindex = dev_addr->bound_dev_if;
180 nla_put(skb, attrtype, size, daddr);
181
182
183 nlmsg_end(skb, nlh);
184 rdma_nl_multicast(skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
185
186
187
188
189 return -ENODATA;
190}
191
192int rdma_addr_size(const struct sockaddr *addr)
193{
194 switch (addr->sa_family) {
195 case AF_INET:
196 return sizeof(struct sockaddr_in);
197 case AF_INET6:
198 return sizeof(struct sockaddr_in6);
199 case AF_IB:
200 return sizeof(struct sockaddr_ib);
201 default:
202 return 0;
203 }
204}
205EXPORT_SYMBOL(rdma_addr_size);
206
207int rdma_addr_size_in6(struct sockaddr_in6 *addr)
208{
209 int ret = rdma_addr_size((struct sockaddr *) addr);
210
211 return ret <= sizeof(*addr) ? ret : 0;
212}
213EXPORT_SYMBOL(rdma_addr_size_in6);
214
215int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
216{
217 int ret = rdma_addr_size((struct sockaddr *) addr);
218
219 return ret <= sizeof(*addr) ? ret : 0;
220}
221EXPORT_SYMBOL(rdma_addr_size_kss);
222
223
224
225
226
227
228
229
230
231
232void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
233 const struct net_device *dev)
234{
235 dev_addr->dev_type = dev->type;
236 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
237 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
238 dev_addr->bound_dev_if = dev->ifindex;
239}
240EXPORT_SYMBOL(rdma_copy_src_l2_addr);
241
242static struct net_device *
243rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
244{
245 struct net_device *dev = NULL;
246 int ret = -EADDRNOTAVAIL;
247
248 switch (src_in->sa_family) {
249 case AF_INET:
250 dev = __ip_dev_find(net,
251 ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
252 false);
253 if (dev)
254 ret = 0;
255 break;
256#if IS_ENABLED(CONFIG_IPV6)
257 case AF_INET6:
258 for_each_netdev_rcu(net, dev) {
259 if (ipv6_chk_addr(net,
260 &((const struct sockaddr_in6 *)src_in)->sin6_addr,
261 dev, 1)) {
262 ret = 0;
263 break;
264 }
265 }
266 break;
267#endif
268 }
269 return ret ? ERR_PTR(ret) : dev;
270}
271
272int rdma_translate_ip(const struct sockaddr *addr,
273 struct rdma_dev_addr *dev_addr)
274{
275 struct net_device *dev;
276
277 if (dev_addr->bound_dev_if) {
278 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
279 if (!dev)
280 return -ENODEV;
281 rdma_copy_src_l2_addr(dev_addr, dev);
282 dev_put(dev);
283 return 0;
284 }
285
286 rcu_read_lock();
287 dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
288 if (!IS_ERR(dev))
289 rdma_copy_src_l2_addr(dev_addr, dev);
290 rcu_read_unlock();
291 return PTR_ERR_OR_ZERO(dev);
292}
293EXPORT_SYMBOL(rdma_translate_ip);
294
295static void set_timeout(struct addr_req *req, unsigned long time)
296{
297 unsigned long delay;
298
299 delay = time - jiffies;
300 if ((long)delay < 0)
301 delay = 0;
302
303 mod_delayed_work(addr_wq, &req->work, delay);
304}
305
306static void queue_req(struct addr_req *req)
307{
308 spin_lock_bh(&lock);
309 list_add_tail(&req->list, &req_list);
310 set_timeout(req, req->timeout);
311 spin_unlock_bh(&lock);
312}
313
314static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
315 const void *daddr, u32 seq, u16 family)
316{
317 if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
318 return -EADDRNOTAVAIL;
319
320 return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
321}
322
323static int dst_fetch_ha(const struct dst_entry *dst,
324 struct rdma_dev_addr *dev_addr,
325 const void *daddr)
326{
327 struct neighbour *n;
328 int ret = 0;
329
330 n = dst_neigh_lookup(dst, daddr);
331 if (!n)
332 return -ENODATA;
333
334 if (!(n->nud_state & NUD_VALID)) {
335 neigh_event_send(n, NULL);
336 ret = -ENODATA;
337 } else {
338 memcpy(dev_addr->dst_dev_addr, n->ha, MAX_ADDR_LEN);
339 }
340
341 neigh_release(n);
342
343 return ret;
344}
345
346static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
347{
348 struct rtable *rt;
349 struct rt6_info *rt6;
350
351 if (family == AF_INET) {
352 rt = container_of(dst, struct rtable, dst);
353 return rt->rt_uses_gateway;
354 }
355
356 rt6 = container_of(dst, struct rt6_info, dst);
357 return rt6->rt6i_flags & RTF_GATEWAY;
358}
359
360static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
361 const struct sockaddr *dst_in, u32 seq)
362{
363 const struct sockaddr_in *dst_in4 =
364 (const struct sockaddr_in *)dst_in;
365 const struct sockaddr_in6 *dst_in6 =
366 (const struct sockaddr_in6 *)dst_in;
367 const void *daddr = (dst_in->sa_family == AF_INET) ?
368 (const void *)&dst_in4->sin_addr.s_addr :
369 (const void *)&dst_in6->sin6_addr;
370 sa_family_t family = dst_in->sa_family;
371
372
373 if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
374 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
375 else
376 return dst_fetch_ha(dst, dev_addr, daddr);
377}
378
379static int addr4_resolve(struct sockaddr *src_sock,
380 const struct sockaddr *dst_sock,
381 struct rdma_dev_addr *addr,
382 struct rtable **prt)
383{
384 struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
385 const struct sockaddr_in *dst_in =
386 (const struct sockaddr_in *)dst_sock;
387
388 __be32 src_ip = src_in->sin_addr.s_addr;
389 __be32 dst_ip = dst_in->sin_addr.s_addr;
390 struct rtable *rt;
391 struct flowi4 fl4;
392 int ret;
393
394 memset(&fl4, 0, sizeof(fl4));
395 fl4.daddr = dst_ip;
396 fl4.saddr = src_ip;
397 fl4.flowi4_oif = addr->bound_dev_if;
398 rt = ip_route_output_key(addr->net, &fl4);
399 ret = PTR_ERR_OR_ZERO(rt);
400 if (ret)
401 return ret;
402
403 src_in->sin_addr.s_addr = fl4.saddr;
404
405 addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
406
407 *prt = rt;
408 return 0;
409}
410
411#if IS_ENABLED(CONFIG_IPV6)
412static int addr6_resolve(struct sockaddr *src_sock,
413 const struct sockaddr *dst_sock,
414 struct rdma_dev_addr *addr,
415 struct dst_entry **pdst)
416{
417 struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
418 const struct sockaddr_in6 *dst_in =
419 (const struct sockaddr_in6 *)dst_sock;
420 struct flowi6 fl6;
421 struct dst_entry *dst;
422 int ret;
423
424 memset(&fl6, 0, sizeof fl6);
425 fl6.daddr = dst_in->sin6_addr;
426 fl6.saddr = src_in->sin6_addr;
427 fl6.flowi6_oif = addr->bound_dev_if;
428
429 ret = ipv6_stub->ipv6_dst_lookup(addr->net, NULL, &dst, &fl6);
430 if (ret < 0)
431 return ret;
432
433 if (ipv6_addr_any(&src_in->sin6_addr))
434 src_in->sin6_addr = fl6.saddr;
435
436 addr->hoplimit = ip6_dst_hoplimit(dst);
437
438 *pdst = dst;
439 return 0;
440}
441#else
442static int addr6_resolve(struct sockaddr *src_sock,
443 const struct sockaddr *dst_sock,
444 struct rdma_dev_addr *addr,
445 struct dst_entry **pdst)
446{
447 return -EADDRNOTAVAIL;
448}
449#endif
450
451static int addr_resolve_neigh(const struct dst_entry *dst,
452 const struct sockaddr *dst_in,
453 struct rdma_dev_addr *addr,
454 unsigned int ndev_flags,
455 u32 seq)
456{
457 int ret = 0;
458
459 if (ndev_flags & IFF_LOOPBACK) {
460 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
461 } else {
462 if (!(ndev_flags & IFF_NOARP)) {
463
464 ret = fetch_ha(dst, addr, dst_in, seq);
465 }
466 }
467 return ret;
468}
469
470static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
471 const struct sockaddr *dst_in,
472 const struct dst_entry *dst,
473 const struct net_device *ndev)
474{
475 int ret = 0;
476
477 if (dst->dev->flags & IFF_LOOPBACK)
478 ret = rdma_translate_ip(dst_in, dev_addr);
479 else
480 rdma_copy_src_l2_addr(dev_addr, dst->dev);
481
482
483
484
485
486
487 if (has_gateway(dst, dst_in->sa_family) &&
488 ndev->type != ARPHRD_INFINIBAND)
489 dev_addr->network = dst_in->sa_family == AF_INET ?
490 RDMA_NETWORK_IPV4 :
491 RDMA_NETWORK_IPV6;
492 else
493 dev_addr->network = RDMA_NETWORK_IB;
494
495 return ret;
496}
497
498static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
499 unsigned int *ndev_flags,
500 const struct sockaddr *dst_in,
501 const struct dst_entry *dst)
502{
503 struct net_device *ndev = READ_ONCE(dst->dev);
504
505 *ndev_flags = ndev->flags;
506
507 if (ndev->flags & IFF_LOOPBACK) {
508
509
510
511
512
513
514 ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
515 if (IS_ERR(ndev))
516 return -ENODEV;
517 }
518
519 return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
520}
521
522static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
523{
524 struct net_device *ndev;
525
526 ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
527 if (IS_ERR(ndev))
528 return PTR_ERR(ndev);
529
530
531
532
533
534
535
536
537 addr->net = dev_net(ndev);
538 addr->bound_dev_if = ndev->ifindex;
539 return 0;
540}
541
542static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
543{
544 addr->net = &init_net;
545 addr->bound_dev_if = 0;
546}
547
548static int addr_resolve(struct sockaddr *src_in,
549 const struct sockaddr *dst_in,
550 struct rdma_dev_addr *addr,
551 bool resolve_neigh,
552 bool resolve_by_gid_attr,
553 u32 seq)
554{
555 struct dst_entry *dst = NULL;
556 unsigned int ndev_flags = 0;
557 struct rtable *rt = NULL;
558 int ret;
559
560 if (!addr->net) {
561 pr_warn_ratelimited("%s: missing namespace\n", __func__);
562 return -EINVAL;
563 }
564
565 rcu_read_lock();
566 if (resolve_by_gid_attr) {
567 if (!addr->sgid_attr) {
568 rcu_read_unlock();
569 pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
570 return -EINVAL;
571 }
572
573
574
575
576
577 ret = set_addr_netns_by_gid_rcu(addr);
578 if (ret) {
579 rcu_read_unlock();
580 return ret;
581 }
582 }
583 if (src_in->sa_family == AF_INET) {
584 ret = addr4_resolve(src_in, dst_in, addr, &rt);
585 dst = &rt->dst;
586 } else {
587 ret = addr6_resolve(src_in, dst_in, addr, &dst);
588 }
589 if (ret) {
590 rcu_read_unlock();
591 goto done;
592 }
593 ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
594 rcu_read_unlock();
595
596
597
598
599
600 if (!ret && resolve_neigh)
601 ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
602
603 if (src_in->sa_family == AF_INET)
604 ip_rt_put(rt);
605 else
606 dst_release(dst);
607done:
608
609
610
611
612 if (resolve_by_gid_attr)
613 rdma_addr_set_net_defaults(addr);
614 return ret;
615}
616
617static void process_one_req(struct work_struct *_work)
618{
619 struct addr_req *req;
620 struct sockaddr *src_in, *dst_in;
621
622 req = container_of(_work, struct addr_req, work.work);
623
624 if (req->status == -ENODATA) {
625 src_in = (struct sockaddr *)&req->src_addr;
626 dst_in = (struct sockaddr *)&req->dst_addr;
627 req->status = addr_resolve(src_in, dst_in, req->addr,
628 true, req->resolve_by_gid_attr,
629 req->seq);
630 if (req->status && time_after_eq(jiffies, req->timeout)) {
631 req->status = -ETIMEDOUT;
632 } else if (req->status == -ENODATA) {
633
634 spin_lock_bh(&lock);
635 if (!list_empty(&req->list))
636 set_timeout(req, req->timeout);
637 spin_unlock_bh(&lock);
638 return;
639 }
640 }
641
642 req->callback(req->status, (struct sockaddr *)&req->src_addr,
643 req->addr, req->context);
644 req->callback = NULL;
645
646 spin_lock_bh(&lock);
647 if (!list_empty(&req->list)) {
648
649
650
651
652
653 cancel_delayed_work(&req->work);
654 list_del_init(&req->list);
655 kfree(req);
656 }
657 spin_unlock_bh(&lock);
658}
659
660int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
661 struct rdma_dev_addr *addr, unsigned long timeout_ms,
662 void (*callback)(int status, struct sockaddr *src_addr,
663 struct rdma_dev_addr *addr, void *context),
664 bool resolve_by_gid_attr, void *context)
665{
666 struct sockaddr *src_in, *dst_in;
667 struct addr_req *req;
668 int ret = 0;
669
670 req = kzalloc(sizeof *req, GFP_KERNEL);
671 if (!req)
672 return -ENOMEM;
673
674 src_in = (struct sockaddr *) &req->src_addr;
675 dst_in = (struct sockaddr *) &req->dst_addr;
676
677 if (src_addr) {
678 if (src_addr->sa_family != dst_addr->sa_family) {
679 ret = -EINVAL;
680 goto err;
681 }
682
683 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
684 } else {
685 src_in->sa_family = dst_addr->sa_family;
686 }
687
688 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
689 req->addr = addr;
690 req->callback = callback;
691 req->context = context;
692 req->resolve_by_gid_attr = resolve_by_gid_attr;
693 INIT_DELAYED_WORK(&req->work, process_one_req);
694 req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
695
696 req->status = addr_resolve(src_in, dst_in, addr, true,
697 req->resolve_by_gid_attr, req->seq);
698 switch (req->status) {
699 case 0:
700 req->timeout = jiffies;
701 queue_req(req);
702 break;
703 case -ENODATA:
704 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
705 queue_req(req);
706 break;
707 default:
708 ret = req->status;
709 goto err;
710 }
711 return ret;
712err:
713 kfree(req);
714 return ret;
715}
716EXPORT_SYMBOL(rdma_resolve_ip);
717
718int roce_resolve_route_from_path(struct sa_path_rec *rec,
719 const struct ib_gid_attr *attr)
720{
721 union {
722 struct sockaddr _sockaddr;
723 struct sockaddr_in _sockaddr_in;
724 struct sockaddr_in6 _sockaddr_in6;
725 } sgid, dgid;
726 struct rdma_dev_addr dev_addr = {};
727 int ret;
728
729 if (rec->roce.route_resolved)
730 return 0;
731
732 rdma_gid2ip(&sgid._sockaddr, &rec->sgid);
733 rdma_gid2ip(&dgid._sockaddr, &rec->dgid);
734
735 if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
736 return -EINVAL;
737
738 if (!attr || !attr->ndev)
739 return -EINVAL;
740
741 dev_addr.net = &init_net;
742 dev_addr.sgid_attr = attr;
743
744 ret = addr_resolve(&sgid._sockaddr, &dgid._sockaddr,
745 &dev_addr, false, true, 0);
746 if (ret)
747 return ret;
748
749 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
750 dev_addr.network == RDMA_NETWORK_IPV6) &&
751 rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
752 return -EINVAL;
753
754 rec->roce.route_resolved = true;
755 return 0;
756}
757
758
759
760
761
762
763
764
765void rdma_addr_cancel(struct rdma_dev_addr *addr)
766{
767 struct addr_req *req, *temp_req;
768 struct addr_req *found = NULL;
769
770 spin_lock_bh(&lock);
771 list_for_each_entry_safe(req, temp_req, &req_list, list) {
772 if (req->addr == addr) {
773
774
775
776
777 list_del_init(&req->list);
778 found = req;
779 break;
780 }
781 }
782 spin_unlock_bh(&lock);
783
784 if (!found)
785 return;
786
787
788
789
790
791 cancel_delayed_work_sync(&found->work);
792 kfree(found);
793}
794EXPORT_SYMBOL(rdma_addr_cancel);
795
796struct resolve_cb_context {
797 struct completion comp;
798 int status;
799};
800
801static void resolve_cb(int status, struct sockaddr *src_addr,
802 struct rdma_dev_addr *addr, void *context)
803{
804 ((struct resolve_cb_context *)context)->status = status;
805 complete(&((struct resolve_cb_context *)context)->comp);
806}
807
808int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
809 const union ib_gid *dgid,
810 u8 *dmac, const struct ib_gid_attr *sgid_attr,
811 int *hoplimit)
812{
813 struct rdma_dev_addr dev_addr;
814 struct resolve_cb_context ctx;
815 union {
816 struct sockaddr _sockaddr;
817 struct sockaddr_in _sockaddr_in;
818 struct sockaddr_in6 _sockaddr_in6;
819 } sgid_addr, dgid_addr;
820 int ret;
821
822 rdma_gid2ip(&sgid_addr._sockaddr, sgid);
823 rdma_gid2ip(&dgid_addr._sockaddr, dgid);
824
825 memset(&dev_addr, 0, sizeof(dev_addr));
826 dev_addr.net = &init_net;
827 dev_addr.sgid_attr = sgid_attr;
828
829 init_completion(&ctx.comp);
830 ret = rdma_resolve_ip(&sgid_addr._sockaddr, &dgid_addr._sockaddr,
831 &dev_addr, 1000, resolve_cb, true, &ctx);
832 if (ret)
833 return ret;
834
835 wait_for_completion(&ctx.comp);
836
837 ret = ctx.status;
838 if (ret)
839 return ret;
840
841 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
842 *hoplimit = dev_addr.hoplimit;
843 return 0;
844}
845
846static int netevent_callback(struct notifier_block *self, unsigned long event,
847 void *ctx)
848{
849 struct addr_req *req;
850
851 if (event == NETEVENT_NEIGH_UPDATE) {
852 struct neighbour *neigh = ctx;
853
854 if (neigh->nud_state & NUD_VALID) {
855 spin_lock_bh(&lock);
856 list_for_each_entry(req, &req_list, list)
857 set_timeout(req, jiffies);
858 spin_unlock_bh(&lock);
859 }
860 }
861 return 0;
862}
863
864static struct notifier_block nb = {
865 .notifier_call = netevent_callback
866};
867
868int addr_init(void)
869{
870 addr_wq = alloc_ordered_workqueue("ib_addr", 0);
871 if (!addr_wq)
872 return -ENOMEM;
873
874 register_netevent_notifier(&nb);
875
876 return 0;
877}
878
879void addr_cleanup(void)
880{
881 unregister_netevent_notifier(&nb);
882 destroy_workqueue(addr_wq);
883 WARN_ON(!list_empty(&req_list));
884}
885