1 // SPDX-License-Identifier: GPL-2.0
2 /* Multipath TCP
3 *
4 * Copyright (c) 2022, Intel Corporation.
5 */
6
7 #include "protocol.h"
8 #include "mib.h"
9 #include "mptcp_pm_gen.h"
10
11 void mptcp_free_local_addr_list(struct mptcp_sock *msk)
12 {
13 struct mptcp_pm_addr_entry *entry, *tmp;
14 struct sock *sk = (struct sock *)msk;
15 LIST_HEAD(free_list);
16
17 if (!mptcp_pm_is_userspace(msk))
18 return;
19
20 spin_lock_bh(&msk->pm.lock);
21 list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list);
22 spin_unlock_bh(&msk->pm.lock);
23
24 list_for_each_entry_safe(entry, tmp, &free_list, list) {
25 sock_kfree_s(sk, entry, sizeof(*entry));
26 }
27 }
28
29 static int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
30 struct mptcp_pm_addr_entry *entry,
31 bool needs_id)
32 {
33 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
34 struct mptcp_pm_addr_entry *match = NULL;
35 struct sock *sk = (struct sock *)msk;
36 struct mptcp_pm_addr_entry *e;
37 bool addr_match = false;
38 bool id_match = false;
39 int ret = -EINVAL;
40
41 bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
42
43 spin_lock_bh(&msk->pm.lock);
44 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
45 addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true);
46 if (addr_match && entry->addr.id == 0 && needs_id)
47 entry->addr.id = e->addr.id;
48 id_match = (e->addr.id == entry->addr.id);
49 if (addr_match && id_match) {
50 match = e;
51 break;
52 } else if (addr_match || id_match) {
53 break;
54 }
55 __set_bit(e->addr.id, id_bitmap);
56 }
57
58 if (!match && !addr_match && !id_match) {
59 /* Memory for the entry is allocated from the
60 * sock option buffer.
61 */
62 e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC);
63 if (!e) {
64 ret = -ENOMEM;
65 goto append_err;
66 }
67
68 *e = *entry;
69 if (!e->addr.id && needs_id)
70 e->addr.id = find_next_zero_bit(id_bitmap,
71 MPTCP_PM_MAX_ADDR_ID + 1,
72 1);
73 list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list);
74 msk->pm.local_addr_used++;
75 ret = e->addr.id;
76 } else if (match) {
77 ret = entry->addr.id;
78 }
79
80 append_err:
81 spin_unlock_bh(&msk->pm.lock);
82 return ret;
83 }
84
85 /* If the subflow is closed from the other peer (not via a
86 * subflow destroy command then), we want to keep the entry
87 * not to assign the same ID to another address and to be
88 * able to send RM_ADDR after the removal of the subflow.
89 */
90 static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
91 struct mptcp_pm_addr_entry *addr)
92 {
93 struct mptcp_pm_addr_entry *entry, *tmp;
94
95 list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
96 if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
97 /* TODO: a refcount is needed because the entry can
98 * be used multiple times (e.g. fullmesh mode).
99 */
100 list_del_rcu(&entry->list);
101 kfree(entry);
102 msk->pm.local_addr_used--;
103 return 0;
104 }
105 }
106
107 return -EINVAL;
108 }
109
110 static struct mptcp_pm_addr_entry *
111 mptcp_userspace_pm_lookup_addr_by_id(struct mptcp_sock *msk, unsigned int id)
112 {
113 struct mptcp_pm_addr_entry *entry;
114
115 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
116 if (entry->addr.id == id)
117 return entry;
118 }
119 return NULL;
120 }
121
122 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
123 unsigned int id,
124 u8 *flags, int *ifindex)
125 {
126 struct mptcp_pm_addr_entry *match;
127
128 spin_lock_bh(&msk->pm.lock);
129 match = mptcp_userspace_pm_lookup_addr_by_id(msk, id);
130 spin_unlock_bh(&msk->pm.lock);
131 if (match) {
132 *flags = match->flags;
133 *ifindex = match->ifindex;
134 }
135
136 return 0;
137 }
138
139 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
140 struct mptcp_addr_info *skc)
141 {
142 struct mptcp_pm_addr_entry *entry = NULL, *e, new_entry;
143 __be16 msk_sport = ((struct inet_sock *)
144 inet_sk((struct sock *)msk))->inet_sport;
145
146 spin_lock_bh(&msk->pm.lock);
147 list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
148 if (mptcp_addresses_equal(&e->addr, skc, false)) {
149 entry = e;
150 break;
151 }
152 }
153 spin_unlock_bh(&msk->pm.lock);
154 if (entry)
155 return entry->addr.id;
156
157 memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
158 new_entry.addr = *skc;
159 new_entry.addr.id = 0;
160 new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
161
162 if (new_entry.addr.port == msk_sport)
163 new_entry.addr.port = 0;
164
165 return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry, true);
166 }
167
168 bool mptcp_userspace_pm_is_backup(struct mptcp_sock *msk,
169 struct mptcp_addr_info *skc)
170 {
171 struct mptcp_pm_addr_entry *entry;
172 bool backup = false;
173
174 spin_lock_bh(&msk->pm.lock);
175 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
176 if (mptcp_addresses_equal(&entry->addr, skc, false)) {
177 backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP);
178 break;
179 }
180 }
181 spin_unlock_bh(&msk->pm.lock);
182
183 return backup;
184 }
185
186 int mptcp_pm_nl_announce_doit(struct sk_buff *skb, struct genl_info *info)
187 {
188 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
189 struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR];
190 struct mptcp_pm_addr_entry addr_val;
191 struct mptcp_sock *msk;
192 int err = -EINVAL;
193 struct sock *sk;
194 u32 token_val;
195
196 if (!addr || !token) {
197 GENL_SET_ERR_MSG(info, "missing required inputs");
198 return err;
199 }
200
201 token_val = nla_get_u32(token);
202
203 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
204 if (!msk) {
205 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
206 return err;
207 }
208
209 sk = (struct sock *)msk;
210
211 if (!mptcp_pm_is_userspace(msk)) {
212 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
213 goto announce_err;
214 }
215
216 err = mptcp_pm_parse_entry(addr, info, true, &addr_val);
217 if (err < 0) {
218 GENL_SET_ERR_MSG(info, "error parsing local address");
219 goto announce_err;
220 }
221
222 if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
223 GENL_SET_ERR_MSG(info, "invalid addr id or flags");
224 err = -EINVAL;
225 goto announce_err;
226 }
227
228 err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val, false);
229 if (err < 0) {
230 GENL_SET_ERR_MSG(info, "did not match address and id");
231 goto announce_err;
232 }
233
234 lock_sock(sk);
235 spin_lock_bh(&msk->pm.lock);
236
237 if (mptcp_pm_alloc_anno_list(msk, &addr_val.addr)) {
238 msk->pm.add_addr_signaled++;
239 mptcp_pm_announce_addr(msk, &addr_val.addr, false);
240 mptcp_pm_nl_addr_send_ack(msk);
241 }
242
243 spin_unlock_bh(&msk->pm.lock);
244 release_sock(sk);
245
246 err = 0;
247 announce_err:
248 sock_put(sk);
249 return err;
250 }
251
252 static int mptcp_userspace_pm_remove_id_zero_address(struct mptcp_sock *msk,
253 struct genl_info *info)
254 {
255 struct mptcp_rm_list list = { .nr = 0 };
256 struct mptcp_subflow_context *subflow;
257 struct sock *sk = (struct sock *)msk;
258 bool has_id_0 = false;
259 int err = -EINVAL;
260
261 lock_sock(sk);
262 mptcp_for_each_subflow(msk, subflow) {
263 if (READ_ONCE(subflow->local_id) == 0) {
264 has_id_0 = true;
265 break;
266 }
267 }
268 if (!has_id_0) {
269 GENL_SET_ERR_MSG(info, "address with id 0 not found");
270 goto remove_err;
271 }
272
273 list.ids[list.nr++] = 0;
274
275 spin_lock_bh(&msk->pm.lock);
276 mptcp_pm_remove_addr(msk, &list);
277 spin_unlock_bh(&msk->pm.lock);
278
279 err = 0;
280
281 remove_err:
282 release_sock(sk);
283 return err;
284 }
285
286 int mptcp_pm_nl_remove_doit(struct sk_buff *skb, struct genl_info *info)
287 {
288 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
289 struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID];
290 struct mptcp_pm_addr_entry *match;
291 struct mptcp_pm_addr_entry *entry;
292 struct mptcp_sock *msk;
293 LIST_HEAD(free_list);
294 int err = -EINVAL;
295 struct sock *sk;
296 u32 token_val;
297 u8 id_val;
298
299 if (!id || !token) {
300 GENL_SET_ERR_MSG(info, "missing required inputs");
301 return err;
302 }
303
304 id_val = nla_get_u8(id);
305 token_val = nla_get_u32(token);
306
307 msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
308 if (!msk) {
309 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
310 return err;
311 }
312
313 sk = (struct sock *)msk;
314
315 if (!mptcp_pm_is_userspace(msk)) {
316 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
317 goto out;
318 }
319
320 if (id_val == 0) {
321 err = mptcp_userspace_pm_remove_id_zero_address(msk, info);
322 goto out;
323 }
324
325 lock_sock(sk);
326
327 match = mptcp_userspace_pm_lookup_addr_by_id(msk, id_val);
328 if (!match) {
329 GENL_SET_ERR_MSG(info, "address with specified id not found");
330 release_sock(sk);
331 goto out;
332 }
333
334 list_move(&match->list, &free_list);
335
336 mptcp_pm_remove_addrs(msk, &free_list);
337
338 release_sock(sk);
339
340 list_for_each_entry_safe(match, entry, &free_list, list) {
341 sock_kfree_s(sk, match, sizeof(*match));
342 }
343
344 err = 0;
345 out:
346 sock_put(sk);
347 return err;
348 }
349
350 int mptcp_pm_nl_subflow_create_doit(struct sk_buff *skb, struct genl_info *info)
351 {
352 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
353 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
354 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
355 struct mptcp_pm_addr_entry local = { 0 };
356 struct mptcp_addr_info addr_r;
357 struct mptcp_sock *msk;
358 int err = -EINVAL;
359 struct sock *sk;
360 u32 token_val;
361
362 if (!laddr || !raddr || !token) {
363 GENL_SET_ERR_MSG(info, "missing required inputs");
364 return err;
365 }
366
367 token_val = nla_get_u32(token);
368
369 msk = mptcp_token_get_sock(genl_info_net(info), token_val);
370 if (!msk) {
371 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
372 return err;
373 }
374
375 sk = (struct sock *)msk;
376
377 if (!mptcp_pm_is_userspace(msk)) {
378 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
379 goto create_err;
380 }
381
382 err = mptcp_pm_parse_entry(laddr, info, true, &local);
383 if (err < 0) {
384 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
385 goto create_err;
386 }
387
388 if (local.flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
389 GENL_SET_ERR_MSG(info, "invalid addr flags");
390 err = -EINVAL;
391 goto create_err;
392 }
393 local.flags |= MPTCP_PM_ADDR_FLAG_SUBFLOW;
394
395 err = mptcp_pm_parse_addr(raddr, info, &addr_r);
396 if (err < 0) {
397 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
398 goto create_err;
399 }
400
401 if (!mptcp_pm_addr_families_match(sk, &local.addr, &addr_r)) {
402 GENL_SET_ERR_MSG(info, "families mismatch");
403 err = -EINVAL;
404 goto create_err;
405 }
406
407 err = mptcp_userspace_pm_append_new_local_addr(msk, &local, false);
408 if (err < 0) {
409 GENL_SET_ERR_MSG(info, "did not match address and id");
410 goto create_err;
411 }
412
413 lock_sock(sk);
414
415 err = __mptcp_subflow_connect(sk, &local.addr, &addr_r);
416
417 release_sock(sk);
418
419 spin_lock_bh(&msk->pm.lock);
420 if (err)
421 mptcp_userspace_pm_delete_local_addr(msk, &local);
422 else
423 msk->pm.subflows++;
424 spin_unlock_bh(&msk->pm.lock);
425
426 create_err:
427 sock_put(sk);
428 return err;
429 }
430
431 static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk,
432 const struct mptcp_addr_info *local,
433 const struct mptcp_addr_info *remote)
434 {
435 struct mptcp_subflow_context *subflow;
436
437 if (local->family != remote->family)
438 return NULL;
439
440 mptcp_for_each_subflow(msk, subflow) {
441 const struct inet_sock *issk;
442 struct sock *ssk;
443
444 ssk = mptcp_subflow_tcp_sock(subflow);
445
446 if (local->family != ssk->sk_family)
447 continue;
448
449 issk = inet_sk(ssk);
450
451 switch (ssk->sk_family) {
452 case AF_INET:
453 if (issk->inet_saddr != local->addr.s_addr ||
454 issk->inet_daddr != remote->addr.s_addr)
455 continue;
456 break;
457 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
458 case AF_INET6: {
459 const struct ipv6_pinfo *pinfo = inet6_sk(ssk);
460
461 if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) ||
462 !ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr))
463 continue;
464 break;
465 }
466 #endif
467 default:
468 continue;
469 }
470
471 if (issk->inet_sport == local->port &&
472 issk->inet_dport == remote->port)
473 return ssk;
474 }
475
476 return NULL;
477 }
478
479 int mptcp_pm_nl_subflow_destroy_doit(struct sk_buff *skb, struct genl_info *info)
480 {
481 struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
482 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
483 struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
484 struct mptcp_addr_info addr_l;
485 struct mptcp_addr_info addr_r;
486 struct mptcp_sock *msk;
487 struct sock *sk, *ssk;
488 int err = -EINVAL;
489 u32 token_val;
490
491 if (!laddr || !raddr || !token) {
492 GENL_SET_ERR_MSG(info, "missing required inputs");
493 return err;
494 }
495
496 token_val = nla_get_u32(token);
497
498 msk = mptcp_token_get_sock(genl_info_net(info), token_val);
499 if (!msk) {
500 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
501 return err;
502 }
503
504 sk = (struct sock *)msk;
505
506 if (!mptcp_pm_is_userspace(msk)) {
507 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
508 goto destroy_err;
509 }
510
511 err = mptcp_pm_parse_addr(laddr, info, &addr_l);
512 if (err < 0) {
513 NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
514 goto destroy_err;
515 }
516
517 err = mptcp_pm_parse_addr(raddr, info, &addr_r);
518 if (err < 0) {
519 NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
520 goto destroy_err;
521 }
522
523 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
524 if (addr_l.family == AF_INET && ipv6_addr_v4mapped(&addr_r.addr6)) {
525 ipv6_addr_set_v4mapped(addr_l.addr.s_addr, &addr_l.addr6);
526 addr_l.family = AF_INET6;
527 }
528 if (addr_r.family == AF_INET && ipv6_addr_v4mapped(&addr_l.addr6)) {
529 ipv6_addr_set_v4mapped(addr_r.addr.s_addr, &addr_r.addr6);
530 addr_r.family = AF_INET6;
531 }
532 #endif
533 if (addr_l.family != addr_r.family) {
534 GENL_SET_ERR_MSG(info, "address families do not match");
535 err = -EINVAL;
536 goto destroy_err;
537 }
538
539 if (!addr_l.port || !addr_r.port) {
540 GENL_SET_ERR_MSG(info, "missing local or remote port");
541 err = -EINVAL;
542 goto destroy_err;
543 }
544
545 lock_sock(sk);
546 ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
547 if (ssk) {
548 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
549 struct mptcp_pm_addr_entry entry = { .addr = addr_l };
550
551 spin_lock_bh(&msk->pm.lock);
552 mptcp_userspace_pm_delete_local_addr(msk, &entry);
553 spin_unlock_bh(&msk->pm.lock);
554 mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
555 mptcp_close_ssk(sk, ssk, subflow);
556 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);
557 err = 0;
558 } else {
559 err = -ESRCH;
560 }
561 release_sock(sk);
562
563 destroy_err:
564 sock_put(sk);
565 return err;
566 }
567
568 int mptcp_userspace_pm_set_flags(struct sk_buff *skb, struct genl_info *info)
569 {
570 struct mptcp_pm_addr_entry loc = { .addr = { .family = AF_UNSPEC }, };
571 struct mptcp_pm_addr_entry rem = { .addr = { .family = AF_UNSPEC }, };
572 struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
573 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
574 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
575 struct net *net = sock_net(skb->sk);
576 struct mptcp_sock *msk;
577 int ret = -EINVAL;
578 struct sock *sk;
579 u32 token_val;
580 u8 bkup = 0;
581
582 token_val = nla_get_u32(token);
583
584 msk = mptcp_token_get_sock(net, token_val);
585 if (!msk) {
586 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
587 return ret;
588 }
589
590 sk = (struct sock *)msk;
591
592 if (!mptcp_pm_is_userspace(msk)) {
593 GENL_SET_ERR_MSG(info, "userspace PM not selected");
594 goto set_flags_err;
595 }
596
597 ret = mptcp_pm_parse_entry(attr, info, false, &loc);
598 if (ret < 0)
599 goto set_flags_err;
600
601 if (attr_rem) {
602 ret = mptcp_pm_parse_entry(attr_rem, info, false, &rem);
603 if (ret < 0)
604 goto set_flags_err;
605 }
606
607 if (loc.addr.family == AF_UNSPEC ||
608 rem.addr.family == AF_UNSPEC) {
609 GENL_SET_ERR_MSG(info, "invalid address families");
610 ret = -EINVAL;
611 goto set_flags_err;
612 }
613
614 if (loc.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
615 bkup = 1;
616
617 lock_sock(sk);
618 ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc.addr, &rem.addr, bkup);
619 release_sock(sk);
620
621 set_flags_err:
622 sock_put(sk);
623 return ret;
624 }
625
626 int mptcp_userspace_pm_dump_addr(struct sk_buff *msg,
627 struct netlink_callback *cb)
628 {
629 struct id_bitmap {
630 DECLARE_BITMAP(map, MPTCP_PM_MAX_ADDR_ID + 1);
631 } *bitmap;
632 const struct genl_info *info = genl_info_dump(cb);
633 struct net *net = sock_net(msg->sk);
634 struct mptcp_pm_addr_entry *entry;
635 struct mptcp_sock *msk;
636 struct nlattr *token;
637 int ret = -EINVAL;
638 struct sock *sk;
639 void *hdr;
640
641 bitmap = (struct id_bitmap *)cb->ctx;
642 token = info->attrs[MPTCP_PM_ATTR_TOKEN];
643
644 msk = mptcp_token_get_sock(net, nla_get_u32(token));
645 if (!msk) {
646 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
647 return ret;
648 }
649
650 sk = (struct sock *)msk;
651
652 if (!mptcp_pm_is_userspace(msk)) {
653 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
654 goto out;
655 }
656
657 lock_sock(sk);
658 spin_lock_bh(&msk->pm.lock);
659 list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
660 if (test_bit(entry->addr.id, bitmap->map))
661 continue;
662
663 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid,
664 cb->nlh->nlmsg_seq, &mptcp_genl_family,
665 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR);
666 if (!hdr)
667 break;
668
669 if (mptcp_nl_fill_addr(msg, entry) < 0) {
670 genlmsg_cancel(msg, hdr);
671 break;
672 }
673
674 __set_bit(entry->addr.id, bitmap->map);
675 genlmsg_end(msg, hdr);
676 }
677 spin_unlock_bh(&msk->pm.lock);
678 release_sock(sk);
679 ret = msg->len;
680
681 out:
682 sock_put(sk);
683 return ret;
684 }
685
686 int mptcp_userspace_pm_get_addr(struct sk_buff *skb,
687 struct genl_info *info)
688 {
689 struct nlattr *attr = info->attrs[MPTCP_PM_ENDPOINT_ADDR];
690 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
691 struct mptcp_pm_addr_entry addr, *entry;
692 struct net *net = sock_net(skb->sk);
693 struct mptcp_sock *msk;
694 struct sk_buff *msg;
695 int ret = -EINVAL;
696 struct sock *sk;
697 void *reply;
698
699 msk = mptcp_token_get_sock(net, nla_get_u32(token));
700 if (!msk) {
701 NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
702 return ret;
703 }
704
705 sk = (struct sock *)msk;
706
707 if (!mptcp_pm_is_userspace(msk)) {
708 GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
709 goto out;
710 }
711
712 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
713 if (ret < 0)
714 goto out;
715
716 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
717 if (!msg) {
718 ret = -ENOMEM;
719 goto out;
720 }
721
722 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
723 info->genlhdr->cmd);
724 if (!reply) {
725 GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
726 ret = -EMSGSIZE;
727 goto fail;
728 }
729
730 lock_sock(sk);
731 spin_lock_bh(&msk->pm.lock);
732 entry = mptcp_userspace_pm_lookup_addr_by_id(msk, addr.addr.id);
733 if (!entry) {
734 GENL_SET_ERR_MSG(info, "address not found");
735 ret = -EINVAL;
736 goto unlock_fail;
737 }
738
739 ret = mptcp_nl_fill_addr(msg, entry);
740 if (ret)
741 goto unlock_fail;
742
743 genlmsg_end(msg, reply);
744 ret = genlmsg_reply(msg, info);
745 spin_unlock_bh(&msk->pm.lock);
746 release_sock(sk);
747 sock_put(sk);
748 return ret;
749
750 unlock_fail:
751 spin_unlock_bh(&msk->pm.lock);
752 release_sock(sk);
753 fail:
754 nlmsg_free(msg);
755 out:
756 sock_put(sk);
757 return ret;
758 }
759
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