1/*
2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.
3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
5 * Copyright (c) 2005 Intel Corporation. All rights reserved.
6 *
7 * This software is available to you under a choice of one of two
8 * licenses. You may choose to be licensed under the terms of the GNU
9 * General Public License (GPL) Version 2, available from the file
10 * COPYING in the main directory of this source tree, or the
11 * OpenIB.org BSD license below:
12 *
13 * Redistribution and use in source and binary forms, with or
14 * without modification, are permitted provided that the following
15 * conditions are met:
16 *
17 * - Redistributions of source code must retain the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer.
20 *
21 * - Redistributions in binary form must reproduce the above
22 * copyright notice, this list of conditions and the following
23 * disclaimer in the documentation and/or other materials
24 * provided with the distribution.
25 *
26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
33 * SOFTWARE.
34 */
35
36#include <linux/mutex.h>
37#include <linux/inetdevice.h>
38#include <linux/slab.h>
39#include <linux/workqueue.h>
40#include <net/arp.h>
41#include <net/neighbour.h>
42#include <net/route.h>
43#include <net/netevent.h>
44#include <net/ipv6_stubs.h>
45#include <net/ip6_route.h>
46#include <rdma/ib_addr.h>
47#include <rdma/ib_cache.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; /* Consider gid attr in resolve phase */
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 .validation_type = NLA_VALIDATE_MIN,
80 .min = sizeof(struct rdma_nla_ls_gid)},
81};
82
83static void ib_nl_process_ip_rsep(const struct nlmsghdr *nlh)
84{
85 struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
86 union ib_gid gid;
87 struct addr_req *req;
88 int found = 0;
89 int ret;
90
91 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
92 return;
93
94 ret = nla_parse_deprecated(tb, maxtype: LS_NLA_TYPE_MAX - 1, head: nlmsg_data(nlh),
95 len: nlmsg_len(nlh), policy: ib_nl_addr_policy, NULL);
96 if (ret)
97 return;
98
99 if (!tb[LS_NLA_TYPE_DGID])
100 return;
101 memcpy(&gid, nla_data(tb[LS_NLA_TYPE_DGID]), sizeof(gid));
102
103 spin_lock_bh(lock: &lock);
104 list_for_each_entry(req, &req_list, list) {
105 if (nlh->nlmsg_seq != req->seq)
106 continue;
107 /* We set the DGID part, the rest was set earlier */
108 rdma_addr_set_dgid(dev_addr: req->addr, gid: &gid);
109 req->status = 0;
110 found = 1;
111 break;
112 }
113 spin_unlock_bh(lock: &lock);
114
115 if (!found)
116 pr_info("Couldn't find request waiting for DGID: %pI6\n",
117 &gid);
118}
119
120int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
121 struct nlmsghdr *nlh,
122 struct netlink_ext_ack *extack)
123{
124 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
125 !(NETLINK_CB(skb).sk))
126 return -EPERM;
127
128 ib_nl_process_ip_rsep(nlh);
129
130 return 0;
131}
132
133static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
134 const void *daddr,
135 u32 seq, u16 family)
136{
137 struct sk_buff *skb = NULL;
138 struct nlmsghdr *nlh;
139 struct rdma_ls_ip_resolve_header *header;
140 void *data;
141 size_t size;
142 int attrtype;
143 int len;
144
145 if (family == AF_INET) {
146 size = sizeof(struct in_addr);
147 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
148 } else {
149 size = sizeof(struct in6_addr);
150 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
151 }
152
153 len = nla_total_size(payload: sizeof(size));
154 len += NLMSG_ALIGN(sizeof(*header));
155
156 skb = nlmsg_new(payload: len, GFP_KERNEL);
157 if (!skb)
158 return -ENOMEM;
159
160 data = ibnl_put_msg(skb, nlh: &nlh, seq, len: 0, client: RDMA_NL_LS,
161 op: RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
162 if (!data) {
163 nlmsg_free(skb);
164 return -ENODATA;
165 }
166
167 /* Construct the family header first */
168 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
169 header->ifindex = dev_addr->bound_dev_if;
170 nla_put(skb, attrtype, attrlen: size, data: daddr);
171
172 /* Repair the nlmsg header length */
173 nlmsg_end(skb, nlh);
174 rdma_nl_multicast(net: &init_net, skb, group: RDMA_NL_GROUP_LS, GFP_KERNEL);
175
176 /* Make the request retry, so when we get the response from userspace
177 * we will have something.
178 */
179 return -ENODATA;
180}
181
182int rdma_addr_size(const struct sockaddr *addr)
183{
184 switch (addr->sa_family) {
185 case AF_INET:
186 return sizeof(struct sockaddr_in);
187 case AF_INET6:
188 return sizeof(struct sockaddr_in6);
189 case AF_IB:
190 return sizeof(struct sockaddr_ib);
191 default:
192 return 0;
193 }
194}
195EXPORT_SYMBOL(rdma_addr_size);
196
197int rdma_addr_size_in6(struct sockaddr_in6 *addr)
198{
199 int ret = rdma_addr_size((struct sockaddr *) addr);
200
201 return ret <= sizeof(*addr) ? ret : 0;
202}
203EXPORT_SYMBOL(rdma_addr_size_in6);
204
205int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
206{
207 int ret = rdma_addr_size((struct sockaddr *) addr);
208
209 return ret <= sizeof(*addr) ? ret : 0;
210}
211EXPORT_SYMBOL(rdma_addr_size_kss);
212
213/**
214 * rdma_copy_src_l2_addr - Copy netdevice source addresses
215 * @dev_addr: Destination address pointer where to copy the addresses
216 * @dev: Netdevice whose source addresses to copy
217 *
218 * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
219 * This includes unicast address, broadcast address, device type and
220 * interface index.
221 */
222void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
223 const struct net_device *dev)
224{
225 dev_addr->dev_type = dev->type;
226 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
227 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
228 dev_addr->bound_dev_if = dev->ifindex;
229}
230EXPORT_SYMBOL(rdma_copy_src_l2_addr);
231
232static struct net_device *
233rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
234{
235 struct net_device *dev = NULL;
236 int ret = -EADDRNOTAVAIL;
237
238 switch (src_in->sa_family) {
239 case AF_INET:
240 dev = __ip_dev_find(net,
241 addr: ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
242 devref: false);
243 if (dev)
244 ret = 0;
245 break;
246#if IS_ENABLED(CONFIG_IPV6)
247 case AF_INET6:
248 for_each_netdev_rcu(net, dev) {
249 if (ipv6_chk_addr(net,
250 addr: &((const struct sockaddr_in6 *)src_in)->sin6_addr,
251 dev, strict: 1)) {
252 ret = 0;
253 break;
254 }
255 }
256 break;
257#endif
258 }
259 return ret ? ERR_PTR(error: ret) : dev;
260}
261
262int rdma_translate_ip(const struct sockaddr *addr,
263 struct rdma_dev_addr *dev_addr)
264{
265 struct net_device *dev;
266
267 if (dev_addr->bound_dev_if) {
268 dev = dev_get_by_index(net: dev_addr->net, ifindex: dev_addr->bound_dev_if);
269 if (!dev)
270 return -ENODEV;
271 rdma_copy_src_l2_addr(dev_addr, dev);
272 dev_put(dev);
273 return 0;
274 }
275
276 rcu_read_lock();
277 dev = rdma_find_ndev_for_src_ip_rcu(net: dev_addr->net, src_in: addr);
278 if (!IS_ERR(ptr: dev))
279 rdma_copy_src_l2_addr(dev_addr, dev);
280 rcu_read_unlock();
281 return PTR_ERR_OR_ZERO(ptr: dev);
282}
283EXPORT_SYMBOL(rdma_translate_ip);
284
285static void set_timeout(struct addr_req *req, unsigned long time)
286{
287 unsigned long delay;
288
289 delay = time - jiffies;
290 if ((long)delay < 0)
291 delay = 0;
292
293 mod_delayed_work(wq: addr_wq, dwork: &req->work, delay);
294}
295
296static void queue_req(struct addr_req *req)
297{
298 spin_lock_bh(lock: &lock);
299 list_add_tail(new: &req->list, head: &req_list);
300 set_timeout(req, time: req->timeout);
301 spin_unlock_bh(lock: &lock);
302}
303
304static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
305 const void *daddr, u32 seq, u16 family)
306{
307 if (!rdma_nl_chk_listeners(group: RDMA_NL_GROUP_LS))
308 return -EADDRNOTAVAIL;
309
310 return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
311}
312
313static int dst_fetch_ha(const struct dst_entry *dst,
314 struct rdma_dev_addr *dev_addr,
315 const void *daddr)
316{
317 struct neighbour *n;
318 int ret = 0;
319
320 n = dst_neigh_lookup(dst, daddr);
321 if (!n)
322 return -ENODATA;
323
324 if (!(n->nud_state & NUD_VALID)) {
325 neigh_event_send(neigh: n, NULL);
326 ret = -ENODATA;
327 } else {
328 neigh_ha_snapshot(dst: dev_addr->dst_dev_addr, n, dev: dst->dev);
329 }
330
331 neigh_release(neigh: n);
332
333 return ret;
334}
335
336static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
337{
338 if (family == AF_INET)
339 return dst_rtable(dst)->rt_uses_gateway;
340
341 return dst_rt6_info(dst)->rt6i_flags & RTF_GATEWAY;
342}
343
344static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
345 const struct sockaddr *dst_in, u32 seq)
346{
347 const struct sockaddr_in *dst_in4 =
348 (const struct sockaddr_in *)dst_in;
349 const struct sockaddr_in6 *dst_in6 =
350 (const struct sockaddr_in6 *)dst_in;
351 const void *daddr = (dst_in->sa_family == AF_INET) ?
352 (const void *)&dst_in4->sin_addr.s_addr :
353 (const void *)&dst_in6->sin6_addr;
354 sa_family_t family = dst_in->sa_family;
355
356 might_sleep();
357
358 /* If we have a gateway in IB mode then it must be an IB network */
359 if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
360 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
361 else
362 return dst_fetch_ha(dst, dev_addr, daddr);
363}
364
365static int addr4_resolve(struct sockaddr *src_sock,
366 const struct sockaddr *dst_sock,
367 struct rdma_dev_addr *addr,
368 struct rtable **prt)
369{
370 struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
371 const struct sockaddr_in *dst_in =
372 (const struct sockaddr_in *)dst_sock;
373
374 __be32 src_ip = src_in->sin_addr.s_addr;
375 __be32 dst_ip = dst_in->sin_addr.s_addr;
376 struct rtable *rt;
377 struct flowi4 fl4;
378 int ret;
379
380 memset(&fl4, 0, sizeof(fl4));
381 fl4.daddr = dst_ip;
382 fl4.saddr = src_ip;
383 fl4.flowi4_oif = addr->bound_dev_if;
384 rt = ip_route_output_key(net: addr->net, flp: &fl4);
385 ret = PTR_ERR_OR_ZERO(ptr: rt);
386 if (ret)
387 return ret;
388
389 src_in->sin_addr.s_addr = fl4.saddr;
390
391 addr->hoplimit = ip4_dst_hoplimit(dst: &rt->dst);
392
393 *prt = rt;
394 return 0;
395}
396
397#if IS_ENABLED(CONFIG_IPV6)
398static int addr6_resolve(struct sockaddr *src_sock,
399 const struct sockaddr *dst_sock,
400 struct rdma_dev_addr *addr,
401 struct dst_entry **pdst)
402{
403 struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
404 const struct sockaddr_in6 *dst_in =
405 (const struct sockaddr_in6 *)dst_sock;
406 struct flowi6 fl6;
407 struct dst_entry *dst;
408
409 memset(&fl6, 0, sizeof fl6);
410 fl6.daddr = dst_in->sin6_addr;
411 fl6.saddr = src_in->sin6_addr;
412 fl6.flowi6_oif = addr->bound_dev_if;
413
414 dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
415 if (IS_ERR(ptr: dst))
416 return PTR_ERR(ptr: dst);
417
418 if (ipv6_addr_any(a: &src_in->sin6_addr))
419 src_in->sin6_addr = fl6.saddr;
420
421 addr->hoplimit = ip6_dst_hoplimit(dst);
422
423 *pdst = dst;
424 return 0;
425}
426#else
427static int addr6_resolve(struct sockaddr *src_sock,
428 const struct sockaddr *dst_sock,
429 struct rdma_dev_addr *addr,
430 struct dst_entry **pdst)
431{
432 return -EADDRNOTAVAIL;
433}
434#endif
435
436static bool is_dst_local(const struct dst_entry *dst)
437{
438 if (dst->ops->family == AF_INET)
439 return !!(dst_rtable(dst)->rt_type & RTN_LOCAL);
440 else if (dst->ops->family == AF_INET6)
441 return !!(dst_rt6_info(dst)->rt6i_flags & RTF_LOCAL);
442 else
443 return false;
444}
445
446static int addr_resolve_neigh(const struct dst_entry *dst,
447 const struct sockaddr *dst_in,
448 struct rdma_dev_addr *addr,
449 u32 seq)
450{
451 if (is_dst_local(dst)) {
452 /* When the destination is local entry, source and destination
453 * are same. Skip the neighbour lookup.
454 */
455 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
456 return 0;
457 }
458
459 return fetch_ha(dst, dev_addr: addr, dst_in, seq);
460}
461
462static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
463 const struct sockaddr *dst_in,
464 const struct dst_entry *dst)
465{
466 struct net_device *ndev = READ_ONCE(dst->dev);
467
468 /* A physical device must be the RDMA device to use */
469 if (is_dst_local(dst)) {
470 int ret;
471 /*
472 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
473 * loopback IP address. So if route is resolved to loopback
474 * interface, translate that to a real ndev based on non
475 * loopback IP address.
476 */
477 ndev = rdma_find_ndev_for_src_ip_rcu(net: dev_net(dev: ndev), src_in: dst_in);
478 if (IS_ERR(ptr: ndev))
479 return -ENODEV;
480 ret = rdma_translate_ip(dst_in, dev_addr);
481 if (ret)
482 return ret;
483 } else {
484 rdma_copy_src_l2_addr(dev_addr, dst->dev);
485 }
486
487 /*
488 * If there's a gateway and type of device not ARPHRD_INFINIBAND,
489 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
490 * network type accordingly.
491 */
492 if (has_gateway(dst, family: dst_in->sa_family) &&
493 ndev->type != ARPHRD_INFINIBAND)
494 dev_addr->network = dst_in->sa_family == AF_INET ?
495 RDMA_NETWORK_IPV4 :
496 RDMA_NETWORK_IPV6;
497 else
498 dev_addr->network = RDMA_NETWORK_IB;
499
500 return 0;
501}
502
503static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
504{
505 struct net_device *ndev;
506
507 ndev = rdma_read_gid_attr_ndev_rcu(attr: addr->sgid_attr);
508 if (IS_ERR(ptr: ndev))
509 return PTR_ERR(ptr: ndev);
510
511 /*
512 * Since we are holding the rcu, reading net and ifindex
513 * are safe without any additional reference; because
514 * change_net_namespace() in net/core/dev.c does rcu sync
515 * after it changes the state to IFF_DOWN and before
516 * updating netdev fields {net, ifindex}.
517 */
518 addr->net = dev_net(dev: ndev);
519 addr->bound_dev_if = ndev->ifindex;
520 return 0;
521}
522
523static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
524{
525 addr->net = &init_net;
526 addr->bound_dev_if = 0;
527}
528
529static int addr_resolve(struct sockaddr *src_in,
530 const struct sockaddr *dst_in,
531 struct rdma_dev_addr *addr,
532 bool resolve_neigh,
533 bool resolve_by_gid_attr,
534 u32 seq)
535{
536 struct dst_entry *dst = NULL;
537 struct rtable *rt = NULL;
538 int ret;
539
540 if (!addr->net) {
541 pr_warn_ratelimited("%s: missing namespace\n", __func__);
542 return -EINVAL;
543 }
544
545 rcu_read_lock();
546 if (resolve_by_gid_attr) {
547 if (!addr->sgid_attr) {
548 rcu_read_unlock();
549 pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
550 return -EINVAL;
551 }
552 /*
553 * If the request is for a specific gid attribute of the
554 * rdma_dev_addr, derive net from the netdevice of the
555 * GID attribute.
556 */
557 ret = set_addr_netns_by_gid_rcu(addr);
558 if (ret) {
559 rcu_read_unlock();
560 return ret;
561 }
562 }
563 if (src_in->sa_family == AF_INET) {
564 ret = addr4_resolve(src_sock: src_in, dst_sock: dst_in, addr, prt: &rt);
565 dst = &rt->dst;
566 } else {
567 ret = addr6_resolve(src_sock: src_in, dst_sock: dst_in, addr, pdst: &dst);
568 }
569 if (ret) {
570 rcu_read_unlock();
571 goto done;
572 }
573 ret = rdma_set_src_addr_rcu(dev_addr: addr, dst_in, dst);
574 rcu_read_unlock();
575
576 /*
577 * Resolve neighbor destination address if requested and
578 * only if src addr translation didn't fail.
579 */
580 if (!ret && resolve_neigh)
581 ret = addr_resolve_neigh(dst, dst_in, addr, seq);
582
583 if (src_in->sa_family == AF_INET)
584 ip_rt_put(rt);
585 else
586 dst_release(dst);
587done:
588 /*
589 * Clear the addr net to go back to its original state, only if it was
590 * derived from GID attribute in this context.
591 */
592 if (resolve_by_gid_attr)
593 rdma_addr_set_net_defaults(addr);
594 return ret;
595}
596
597static void process_one_req(struct work_struct *_work)
598{
599 struct addr_req *req;
600 struct sockaddr *src_in, *dst_in;
601
602 req = container_of(_work, struct addr_req, work.work);
603
604 if (req->status == -ENODATA) {
605 src_in = (struct sockaddr *)&req->src_addr;
606 dst_in = (struct sockaddr *)&req->dst_addr;
607 req->status = addr_resolve(src_in, dst_in, addr: req->addr,
608 resolve_neigh: true, resolve_by_gid_attr: req->resolve_by_gid_attr,
609 seq: req->seq);
610 if (req->status && time_after_eq(jiffies, req->timeout)) {
611 req->status = -ETIMEDOUT;
612 } else if (req->status == -ENODATA) {
613 /* requeue the work for retrying again */
614 spin_lock_bh(lock: &lock);
615 if (!list_empty(head: &req->list))
616 set_timeout(req, time: req->timeout);
617 spin_unlock_bh(lock: &lock);
618 return;
619 }
620 }
621
622 req->callback(req->status, (struct sockaddr *)&req->src_addr,
623 req->addr, req->context);
624 req->callback = NULL;
625
626 spin_lock_bh(lock: &lock);
627 /*
628 * Although the work will normally have been canceled by the workqueue,
629 * it can still be requeued as long as it is on the req_list.
630 */
631 cancel_delayed_work(dwork: &req->work);
632 if (!list_empty(head: &req->list)) {
633 list_del_init(entry: &req->list);
634 kfree(objp: req);
635 }
636 spin_unlock_bh(lock: &lock);
637}
638
639int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
640 struct rdma_dev_addr *addr, unsigned long timeout_ms,
641 void (*callback)(int status, struct sockaddr *src_addr,
642 struct rdma_dev_addr *addr, void *context),
643 bool resolve_by_gid_attr, void *context)
644{
645 struct sockaddr *src_in, *dst_in;
646 struct addr_req *req;
647 int ret = 0;
648
649 req = kzalloc(sizeof *req, GFP_KERNEL);
650 if (!req)
651 return -ENOMEM;
652
653 src_in = (struct sockaddr *) &req->src_addr;
654 dst_in = (struct sockaddr *) &req->dst_addr;
655
656 if (src_addr) {
657 if (src_addr->sa_family != dst_addr->sa_family) {
658 ret = -EINVAL;
659 goto err;
660 }
661
662 memcpy(src_in, src_addr, rdma_addr_size(src_addr));
663 } else {
664 src_in->sa_family = dst_addr->sa_family;
665 }
666
667 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
668 req->addr = addr;
669 req->callback = callback;
670 req->context = context;
671 req->resolve_by_gid_attr = resolve_by_gid_attr;
672 INIT_DELAYED_WORK(&req->work, process_one_req);
673 req->seq = (u32)atomic_inc_return(v: &ib_nl_addr_request_seq);
674
675 req->status = addr_resolve(src_in, dst_in, addr, resolve_neigh: true,
676 resolve_by_gid_attr: req->resolve_by_gid_attr, seq: req->seq);
677 switch (req->status) {
678 case 0:
679 req->timeout = jiffies;
680 queue_req(req);
681 break;
682 case -ENODATA:
683 req->timeout = msecs_to_jiffies(m: timeout_ms) + jiffies;
684 queue_req(req);
685 break;
686 default:
687 ret = req->status;
688 goto err;
689 }
690 return ret;
691err:
692 kfree(objp: req);
693 return ret;
694}
695EXPORT_SYMBOL(rdma_resolve_ip);
696
697int roce_resolve_route_from_path(struct sa_path_rec *rec,
698 const struct ib_gid_attr *attr)
699{
700 union {
701 struct sockaddr _sockaddr;
702 struct sockaddr_in _sockaddr_in;
703 struct sockaddr_in6 _sockaddr_in6;
704 } sgid, dgid;
705 struct rdma_dev_addr dev_addr = {};
706 int ret;
707
708 might_sleep();
709
710 if (rec->roce.route_resolved)
711 return 0;
712
713 rdma_gid2ip(out: (struct sockaddr *)&sgid, gid: &rec->sgid);
714 rdma_gid2ip(out: (struct sockaddr *)&dgid, gid: &rec->dgid);
715
716 if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
717 return -EINVAL;
718
719 if (!attr || !attr->ndev)
720 return -EINVAL;
721
722 dev_addr.net = &init_net;
723 dev_addr.sgid_attr = attr;
724
725 ret = addr_resolve(src_in: (struct sockaddr *)&sgid, dst_in: (struct sockaddr *)&dgid,
726 addr: &dev_addr, resolve_neigh: false, resolve_by_gid_attr: true, seq: 0);
727 if (ret)
728 return ret;
729
730 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
731 dev_addr.network == RDMA_NETWORK_IPV6) &&
732 rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
733 return -EINVAL;
734
735 rec->roce.route_resolved = true;
736 return 0;
737}
738
739/**
740 * rdma_addr_cancel - Cancel resolve ip request
741 * @addr: Pointer to address structure given previously
742 * during rdma_resolve_ip().
743 * rdma_addr_cancel() is synchronous function which cancels any pending
744 * request if there is any.
745 */
746void rdma_addr_cancel(struct rdma_dev_addr *addr)
747{
748 struct addr_req *req, *temp_req;
749 struct addr_req *found = NULL;
750
751 spin_lock_bh(lock: &lock);
752 list_for_each_entry_safe(req, temp_req, &req_list, list) {
753 if (req->addr == addr) {
754 /*
755 * Removing from the list means we take ownership of
756 * the req
757 */
758 list_del_init(entry: &req->list);
759 found = req;
760 break;
761 }
762 }
763 spin_unlock_bh(lock: &lock);
764
765 if (!found)
766 return;
767
768 /*
769 * sync canceling the work after removing it from the req_list
770 * guarentees no work is running and none will be started.
771 */
772 cancel_delayed_work_sync(dwork: &found->work);
773 kfree(objp: found);
774}
775EXPORT_SYMBOL(rdma_addr_cancel);
776
777struct resolve_cb_context {
778 struct completion comp;
779 int status;
780};
781
782static void resolve_cb(int status, struct sockaddr *src_addr,
783 struct rdma_dev_addr *addr, void *context)
784{
785 ((struct resolve_cb_context *)context)->status = status;
786 complete(&((struct resolve_cb_context *)context)->comp);
787}
788
789int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
790 const union ib_gid *dgid,
791 u8 *dmac, const struct ib_gid_attr *sgid_attr,
792 int *hoplimit)
793{
794 struct rdma_dev_addr dev_addr;
795 struct resolve_cb_context ctx;
796 union {
797 struct sockaddr_in _sockaddr_in;
798 struct sockaddr_in6 _sockaddr_in6;
799 } sgid_addr, dgid_addr;
800 int ret;
801
802 rdma_gid2ip(out: (struct sockaddr *)&sgid_addr, gid: sgid);
803 rdma_gid2ip(out: (struct sockaddr *)&dgid_addr, gid: dgid);
804
805 memset(&dev_addr, 0, sizeof(dev_addr));
806 dev_addr.net = &init_net;
807 dev_addr.sgid_attr = sgid_attr;
808
809 init_completion(x: &ctx.comp);
810 ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
811 (struct sockaddr *)&dgid_addr, &dev_addr, 1000,
812 resolve_cb, true, &ctx);
813 if (ret)
814 return ret;
815
816 wait_for_completion(&ctx.comp);
817
818 ret = ctx.status;
819 if (ret)
820 return ret;
821
822 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
823 *hoplimit = dev_addr.hoplimit;
824 return 0;
825}
826
827static int netevent_callback(struct notifier_block *self, unsigned long event,
828 void *ctx)
829{
830 struct addr_req *req;
831
832 if (event == NETEVENT_NEIGH_UPDATE) {
833 struct neighbour *neigh = ctx;
834
835 if (neigh->nud_state & NUD_VALID) {
836 spin_lock_bh(lock: &lock);
837 list_for_each_entry(req, &req_list, list)
838 set_timeout(req, time: jiffies);
839 spin_unlock_bh(lock: &lock);
840 }
841 }
842 return 0;
843}
844
845static struct notifier_block nb = {
846 .notifier_call = netevent_callback
847};
848
849int addr_init(void)
850{
851 addr_wq = alloc_ordered_workqueue("ib_addr", 0);
852 if (!addr_wq)
853 return -ENOMEM;
854
855 register_netevent_notifier(nb: &nb);
856
857 return 0;
858}
859
860void addr_cleanup(void)
861{
862 unregister_netevent_notifier(nb: &nb);
863 destroy_workqueue(wq: addr_wq);
864 WARN_ON(!list_empty(&req_list));
865}
866

source code of linux/drivers/infiniband/core/addr.c