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1// SPDX-License-Identifier: GPL-2.0
2/* Multipath TCP
3 *
4 * Copyright (c) 2020, Red Hat, Inc.
5 */
6
7#define pr_fmt(fmt) "MPTCP: " fmt
8
9#include <linux/inet.h>
10#include <linux/kernel.h>
11#include <net/tcp.h>
12#include <net/netns/generic.h>
13#include <net/mptcp.h>
14#include <net/genetlink.h>
15#include <uapi/linux/mptcp.h>
16
17#include "protocol.h"
18#include "mib.h"
19
20/* forward declaration */
21static struct genl_family mptcp_genl_family;
22
23static int pm_nl_pernet_id;
24
25struct mptcp_pm_add_entry {
26 struct list_head list;
27 struct mptcp_addr_info addr;
28 struct timer_list add_timer;
29 struct mptcp_sock *sock;
30 u8 retrans_times;
31};
32
33struct pm_nl_pernet {
34 /* protects pernet updates */
35 spinlock_t lock;
36 struct list_head local_addr_list;
37 unsigned int addrs;
38 unsigned int stale_loss_cnt;
39 unsigned int add_addr_signal_max;
40 unsigned int add_addr_accept_max;
41 unsigned int local_addr_max;
42 unsigned int subflows_max;
43 unsigned int next_id;
44 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
45};
46
47#define MPTCP_PM_ADDR_MAX 8
48#define ADD_ADDR_RETRANS_MAX 3
49
50static struct pm_nl_pernet *pm_nl_get_pernet(const struct net *net)
51{
52 return net_generic(net, pm_nl_pernet_id);
53}
54
55static struct pm_nl_pernet *
56pm_nl_get_pernet_from_msk(const struct mptcp_sock *msk)
57{
58 return pm_nl_get_pernet(sock_net((struct sock *)msk));
59}
60
61bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
62 const struct mptcp_addr_info *b, bool use_port)
63{
64 bool addr_equals = false;
65
66 if (a->family == b->family) {
67 if (a->family == AF_INET)
68 addr_equals = a->addr.s_addr == b->addr.s_addr;
69#if IS_ENABLED(CONFIG_MPTCP_IPV6)
70 else
71 addr_equals = !ipv6_addr_cmp(&a->addr6, &b->addr6);
72 } else if (a->family == AF_INET) {
73 if (ipv6_addr_v4mapped(&b->addr6))
74 addr_equals = a->addr.s_addr == b->addr6.s6_addr32[3];
75 } else if (b->family == AF_INET) {
76 if (ipv6_addr_v4mapped(&a->addr6))
77 addr_equals = a->addr6.s6_addr32[3] == b->addr.s_addr;
78#endif
79 }
80
81 if (!addr_equals)
82 return false;
83 if (!use_port)
84 return true;
85
86 return a->port == b->port;
87}
88
89static void local_address(const struct sock_common *skc,
90 struct mptcp_addr_info *addr)
91{
92 addr->family = skc->skc_family;
93 addr->port = htons(skc->skc_num);
94 if (addr->family == AF_INET)
95 addr->addr.s_addr = skc->skc_rcv_saddr;
96#if IS_ENABLED(CONFIG_MPTCP_IPV6)
97 else if (addr->family == AF_INET6)
98 addr->addr6 = skc->skc_v6_rcv_saddr;
99#endif
100}
101
102static void remote_address(const struct sock_common *skc,
103 struct mptcp_addr_info *addr)
104{
105 addr->family = skc->skc_family;
106 addr->port = skc->skc_dport;
107 if (addr->family == AF_INET)
108 addr->addr.s_addr = skc->skc_daddr;
109#if IS_ENABLED(CONFIG_MPTCP_IPV6)
110 else if (addr->family == AF_INET6)
111 addr->addr6 = skc->skc_v6_daddr;
112#endif
113}
114
115static bool lookup_subflow_by_saddr(const struct list_head *list,
116 const struct mptcp_addr_info *saddr)
117{
118 struct mptcp_subflow_context *subflow;
119 struct mptcp_addr_info cur;
120 struct sock_common *skc;
121
122 list_for_each_entry(subflow, list, node) {
123 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
124
125 local_address(skc, &cur);
126 if (mptcp_addresses_equal(&cur, saddr, saddr->port))
127 return true;
128 }
129
130 return false;
131}
132
133static bool lookup_subflow_by_daddr(const struct list_head *list,
134 const struct mptcp_addr_info *daddr)
135{
136 struct mptcp_subflow_context *subflow;
137 struct mptcp_addr_info cur;
138 struct sock_common *skc;
139
140 list_for_each_entry(subflow, list, node) {
141 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
142
143 remote_address(skc, &cur);
144 if (mptcp_addresses_equal(&cur, daddr, daddr->port))
145 return true;
146 }
147
148 return false;
149}
150
151static struct mptcp_pm_addr_entry *
152select_local_address(const struct pm_nl_pernet *pernet,
153 const struct mptcp_sock *msk)
154{
155 const struct sock *sk = (const struct sock *)msk;
156 struct mptcp_pm_addr_entry *entry, *ret = NULL;
157
158 msk_owned_by_me(msk);
159
160 rcu_read_lock();
161 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
162 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW))
163 continue;
164
165 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
166 continue;
167
168 if (entry->addr.family != sk->sk_family) {
169#if IS_ENABLED(CONFIG_MPTCP_IPV6)
170 if ((entry->addr.family == AF_INET &&
171 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
172 (sk->sk_family == AF_INET &&
173 !ipv6_addr_v4mapped(&entry->addr.addr6)))
174#endif
175 continue;
176 }
177
178 ret = entry;
179 break;
180 }
181 rcu_read_unlock();
182 return ret;
183}
184
185static struct mptcp_pm_addr_entry *
186select_signal_address(struct pm_nl_pernet *pernet, const struct mptcp_sock *msk)
187{
188 struct mptcp_pm_addr_entry *entry, *ret = NULL;
189
190 rcu_read_lock();
191 /* do not keep any additional per socket state, just signal
192 * the address list in order.
193 * Note: removal from the local address list during the msk life-cycle
194 * can lead to additional addresses not being announced.
195 */
196 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
197 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
198 continue;
199
200 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL))
201 continue;
202
203 ret = entry;
204 break;
205 }
206 rcu_read_unlock();
207 return ret;
208}
209
210unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk)
211{
212 const struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
213
214 return READ_ONCE(pernet->add_addr_signal_max);
215}
216EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max);
217
218unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk)
219{
220 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
221
222 return READ_ONCE(pernet->add_addr_accept_max);
223}
224EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max);
225
226unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk)
227{
228 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
229
230 return READ_ONCE(pernet->subflows_max);
231}
232EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max);
233
234unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk)
235{
236 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
237
238 return READ_ONCE(pernet->local_addr_max);
239}
240EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max);
241
242bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk)
243{
244 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
245
246 if (msk->pm.subflows == mptcp_pm_get_subflows_max(msk) ||
247 (find_next_and_bit(pernet->id_bitmap, msk->pm.id_avail_bitmap,
248 MPTCP_PM_MAX_ADDR_ID + 1, 0) == MPTCP_PM_MAX_ADDR_ID + 1)) {
249 WRITE_ONCE(msk->pm.work_pending, false);
250 return false;
251 }
252 return true;
253}
254
255struct mptcp_pm_add_entry *
256mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
257 const struct mptcp_addr_info *addr)
258{
259 struct mptcp_pm_add_entry *entry;
260
261 lockdep_assert_held(&msk->pm.lock);
262
263 list_for_each_entry(entry, &msk->pm.anno_list, list) {
264 if (mptcp_addresses_equal(&entry->addr, addr, true))
265 return entry;
266 }
267
268 return NULL;
269}
270
271bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk)
272{
273 struct mptcp_pm_add_entry *entry;
274 struct mptcp_addr_info saddr;
275 bool ret = false;
276
277 local_address((struct sock_common *)sk, &saddr);
278
279 spin_lock_bh(&msk->pm.lock);
280 list_for_each_entry(entry, &msk->pm.anno_list, list) {
281 if (mptcp_addresses_equal(&entry->addr, &saddr, true)) {
282 ret = true;
283 goto out;
284 }
285 }
286
287out:
288 spin_unlock_bh(&msk->pm.lock);
289 return ret;
290}
291
292static void mptcp_pm_add_timer(struct timer_list *timer)
293{
294 struct mptcp_pm_add_entry *entry = from_timer(entry, timer, add_timer);
295 struct mptcp_sock *msk = entry->sock;
296 struct sock *sk = (struct sock *)msk;
297
298 pr_debug("msk=%p", msk);
299
300 if (!msk)
301 return;
302
303 if (inet_sk_state_load(sk) == TCP_CLOSE)
304 return;
305
306 if (!entry->addr.id)
307 return;
308
309 if (mptcp_pm_should_add_signal_addr(msk)) {
310 sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8);
311 goto out;
312 }
313
314 spin_lock_bh(&msk->pm.lock);
315
316 if (!mptcp_pm_should_add_signal_addr(msk)) {
317 pr_debug("retransmit ADD_ADDR id=%d", entry->addr.id);
318 mptcp_pm_announce_addr(msk, &entry->addr, false);
319 mptcp_pm_add_addr_send_ack(msk);
320 entry->retrans_times++;
321 }
322
323 if (entry->retrans_times < ADD_ADDR_RETRANS_MAX)
324 sk_reset_timer(sk, timer,
325 jiffies + mptcp_get_add_addr_timeout(sock_net(sk)));
326
327 spin_unlock_bh(&msk->pm.lock);
328
329 if (entry->retrans_times == ADD_ADDR_RETRANS_MAX)
330 mptcp_pm_subflow_established(msk);
331
332out:
333 __sock_put(sk);
334}
335
336struct mptcp_pm_add_entry *
337mptcp_pm_del_add_timer(struct mptcp_sock *msk,
338 const struct mptcp_addr_info *addr, bool check_id)
339{
340 struct mptcp_pm_add_entry *entry;
341 struct sock *sk = (struct sock *)msk;
342
343 spin_lock_bh(&msk->pm.lock);
344 entry = mptcp_lookup_anno_list_by_saddr(msk, addr);
345 if (entry && (!check_id || entry->addr.id == addr->id))
346 entry->retrans_times = ADD_ADDR_RETRANS_MAX;
347 spin_unlock_bh(&msk->pm.lock);
348
349 if (entry && (!check_id || entry->addr.id == addr->id))
350 sk_stop_timer_sync(sk, &entry->add_timer);
351
352 return entry;
353}
354
355bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
356 const struct mptcp_pm_addr_entry *entry)
357{
358 struct mptcp_pm_add_entry *add_entry = NULL;
359 struct sock *sk = (struct sock *)msk;
360 struct net *net = sock_net(sk);
361
362 lockdep_assert_held(&msk->pm.lock);
363
364 add_entry = mptcp_lookup_anno_list_by_saddr(msk, &entry->addr);
365
366 if (add_entry) {
367 if (mptcp_pm_is_kernel(msk))
368 return false;
369
370 sk_reset_timer(sk, &add_entry->add_timer,
371 jiffies + mptcp_get_add_addr_timeout(net));
372 return true;
373 }
374
375 add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC);
376 if (!add_entry)
377 return false;
378
379 list_add(&add_entry->list, &msk->pm.anno_list);
380
381 add_entry->addr = entry->addr;
382 add_entry->sock = msk;
383 add_entry->retrans_times = 0;
384
385 timer_setup(&add_entry->add_timer, mptcp_pm_add_timer, 0);
386 sk_reset_timer(sk, &add_entry->add_timer,
387 jiffies + mptcp_get_add_addr_timeout(net));
388
389 return true;
390}
391
392void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
393{
394 struct mptcp_pm_add_entry *entry, *tmp;
395 struct sock *sk = (struct sock *)msk;
396 LIST_HEAD(free_list);
397
398 pr_debug("msk=%p", msk);
399
400 spin_lock_bh(&msk->pm.lock);
401 list_splice_init(&msk->pm.anno_list, &free_list);
402 spin_unlock_bh(&msk->pm.lock);
403
404 list_for_each_entry_safe(entry, tmp, &free_list, list) {
405 sk_stop_timer_sync(sk, &entry->add_timer);
406 kfree(entry);
407 }
408}
409
410static bool lookup_address_in_vec(const struct mptcp_addr_info *addrs, unsigned int nr,
411 const struct mptcp_addr_info *addr)
412{
413 int i;
414
415 for (i = 0; i < nr; i++) {
416 if (addrs[i].id == addr->id)
417 return true;
418 }
419
420 return false;
421}
422
423/* Fill all the remote addresses into the array addrs[],
424 * and return the array size.
425 */
426static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk, bool fullmesh,
427 struct mptcp_addr_info *addrs)
428{
429 bool deny_id0 = READ_ONCE(msk->pm.remote_deny_join_id0);
430 struct sock *sk = (struct sock *)msk, *ssk;
431 struct mptcp_subflow_context *subflow;
432 struct mptcp_addr_info remote = { 0 };
433 unsigned int subflows_max;
434 int i = 0;
435
436 subflows_max = mptcp_pm_get_subflows_max(msk);
437 remote_address((struct sock_common *)sk, &remote);
438
439 /* Non-fullmesh endpoint, fill in the single entry
440 * corresponding to the primary MPC subflow remote address
441 */
442 if (!fullmesh) {
443 if (deny_id0)
444 return 0;
445
446 msk->pm.subflows++;
447 addrs[i++] = remote;
448 } else {
449 mptcp_for_each_subflow(msk, subflow) {
450 ssk = mptcp_subflow_tcp_sock(subflow);
451 remote_address((struct sock_common *)ssk, &addrs[i]);
452 addrs[i].id = subflow->remote_id;
453 if (deny_id0 && !addrs[i].id)
454 continue;
455
456 if (!lookup_address_in_vec(addrs, i, &addrs[i]) &&
457 msk->pm.subflows < subflows_max) {
458 msk->pm.subflows++;
459 i++;
460 }
461 }
462 }
463
464 return i;
465}
466
467static void __mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
468 bool prio, bool backup)
469{
470 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
471 bool slow;
472
473 pr_debug("send ack for %s",
474 prio ? "mp_prio" : (mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr"));
475
476 slow = lock_sock_fast(ssk);
477 if (prio) {
478 if (subflow->backup != backup)
479 msk->last_snd = NULL;
480
481 subflow->send_mp_prio = 1;
482 subflow->backup = backup;
483 subflow->request_bkup = backup;
484 }
485
486 __mptcp_subflow_send_ack(ssk);
487 unlock_sock_fast(ssk, slow);
488}
489
490static void mptcp_pm_send_ack(struct mptcp_sock *msk, struct mptcp_subflow_context *subflow,
491 bool prio, bool backup)
492{
493 spin_unlock_bh(&msk->pm.lock);
494 __mptcp_pm_send_ack(msk, subflow, prio, backup);
495 spin_lock_bh(&msk->pm.lock);
496}
497
498static struct mptcp_pm_addr_entry *
499__lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id)
500{
501 struct mptcp_pm_addr_entry *entry;
502
503 list_for_each_entry(entry, &pernet->local_addr_list, list) {
504 if (entry->addr.id == id)
505 return entry;
506 }
507 return NULL;
508}
509
510static struct mptcp_pm_addr_entry *
511__lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info,
512 bool lookup_by_id)
513{
514 struct mptcp_pm_addr_entry *entry;
515
516 list_for_each_entry(entry, &pernet->local_addr_list, list) {
517 if ((!lookup_by_id &&
518 mptcp_addresses_equal(&entry->addr, info, entry->addr.port)) ||
519 (lookup_by_id && entry->addr.id == info->id))
520 return entry;
521 }
522 return NULL;
523}
524
525static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
526{
527 struct sock *sk = (struct sock *)msk;
528 struct mptcp_pm_addr_entry *local;
529 unsigned int add_addr_signal_max;
530 unsigned int local_addr_max;
531 struct pm_nl_pernet *pernet;
532 unsigned int subflows_max;
533
534 pernet = pm_nl_get_pernet(sock_net(sk));
535
536 add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk);
537 local_addr_max = mptcp_pm_get_local_addr_max(msk);
538 subflows_max = mptcp_pm_get_subflows_max(msk);
539
540 /* do lazy endpoint usage accounting for the MPC subflows */
541 if (unlikely(!(msk->pm.status & BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED))) && msk->first) {
542 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(msk->first);
543 struct mptcp_pm_addr_entry *entry;
544 struct mptcp_addr_info mpc_addr;
545 bool backup = false;
546
547 local_address((struct sock_common *)msk->first, &mpc_addr);
548 rcu_read_lock();
549 entry = __lookup_addr(pernet, &mpc_addr, false);
550 if (entry) {
551 __clear_bit(entry->addr.id, msk->pm.id_avail_bitmap);
552 msk->mpc_endpoint_id = entry->addr.id;
553 backup = !!(entry->flags & MPTCP_PM_ADDR_FLAG_BACKUP);
554 }
555 rcu_read_unlock();
556
557 if (backup)
558 mptcp_pm_send_ack(msk, subflow, true, backup);
559
560 msk->pm.status |= BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED);
561 }
562
563 pr_debug("local %d:%d signal %d:%d subflows %d:%d\n",
564 msk->pm.local_addr_used, local_addr_max,
565 msk->pm.add_addr_signaled, add_addr_signal_max,
566 msk->pm.subflows, subflows_max);
567
568 /* check first for announce */
569 if (msk->pm.add_addr_signaled < add_addr_signal_max) {
570 local = select_signal_address(pernet, msk);
571
572 /* due to racing events on both ends we can reach here while
573 * previous add address is still running: if we invoke now
574 * mptcp_pm_announce_addr(), that will fail and the
575 * corresponding id will be marked as used.
576 * Instead let the PM machinery reschedule us when the
577 * current address announce will be completed.
578 */
579 if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL))
580 return;
581
582 if (local) {
583 if (mptcp_pm_alloc_anno_list(msk, local)) {
584 __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
585 msk->pm.add_addr_signaled++;
586 mptcp_pm_announce_addr(msk, &local->addr, false);
587 mptcp_pm_nl_addr_send_ack(msk);
588 }
589 }
590 }
591
592 /* check if should create a new subflow */
593 while (msk->pm.local_addr_used < local_addr_max &&
594 msk->pm.subflows < subflows_max) {
595 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
596 bool fullmesh;
597 int i, nr;
598
599 local = select_local_address(pernet, msk);
600 if (!local)
601 break;
602
603 fullmesh = !!(local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH);
604
605 msk->pm.local_addr_used++;
606 nr = fill_remote_addresses_vec(msk, fullmesh, addrs);
607 if (nr)
608 __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
609 spin_unlock_bh(&msk->pm.lock);
610 for (i = 0; i < nr; i++)
611 __mptcp_subflow_connect(sk, &local->addr, &addrs[i]);
612 spin_lock_bh(&msk->pm.lock);
613 }
614 mptcp_pm_nl_check_work_pending(msk);
615}
616
617static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk)
618{
619 mptcp_pm_create_subflow_or_signal_addr(msk);
620}
621
622static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk)
623{
624 mptcp_pm_create_subflow_or_signal_addr(msk);
625}
626
627/* Fill all the local addresses into the array addrs[],
628 * and return the array size.
629 */
630static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
631 struct mptcp_addr_info *addrs)
632{
633 struct sock *sk = (struct sock *)msk;
634 struct mptcp_pm_addr_entry *entry;
635 struct mptcp_addr_info local;
636 struct pm_nl_pernet *pernet;
637 unsigned int subflows_max;
638 int i = 0;
639
640 pernet = pm_nl_get_pernet_from_msk(msk);
641 subflows_max = mptcp_pm_get_subflows_max(msk);
642
643 rcu_read_lock();
644 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
645 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
646 continue;
647
648 if (entry->addr.family != sk->sk_family) {
649#if IS_ENABLED(CONFIG_MPTCP_IPV6)
650 if ((entry->addr.family == AF_INET &&
651 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
652 (sk->sk_family == AF_INET &&
653 !ipv6_addr_v4mapped(&entry->addr.addr6)))
654#endif
655 continue;
656 }
657
658 if (msk->pm.subflows < subflows_max) {
659 msk->pm.subflows++;
660 addrs[i++] = entry->addr;
661 }
662 }
663 rcu_read_unlock();
664
665 /* If the array is empty, fill in the single
666 * 'IPADDRANY' local address
667 */
668 if (!i) {
669 memset(&local, 0, sizeof(local));
670 local.family = msk->pm.remote.family;
671
672 msk->pm.subflows++;
673 addrs[i++] = local;
674 }
675
676 return i;
677}
678
679static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
680{
681 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
682 struct sock *sk = (struct sock *)msk;
683 unsigned int add_addr_accept_max;
684 struct mptcp_addr_info remote;
685 unsigned int subflows_max;
686 int i, nr;
687
688 add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk);
689 subflows_max = mptcp_pm_get_subflows_max(msk);
690
691 pr_debug("accepted %d:%d remote family %d",
692 msk->pm.add_addr_accepted, add_addr_accept_max,
693 msk->pm.remote.family);
694
695 remote = msk->pm.remote;
696 mptcp_pm_announce_addr(msk, &remote, true);
697 mptcp_pm_nl_addr_send_ack(msk);
698
699 if (lookup_subflow_by_daddr(&msk->conn_list, &remote))
700 return;
701
702 /* pick id 0 port, if none is provided the remote address */
703 if (!remote.port)
704 remote.port = sk->sk_dport;
705
706 /* connect to the specified remote address, using whatever
707 * local address the routing configuration will pick.
708 */
709 nr = fill_local_addresses_vec(msk, addrs);
710
711 msk->pm.add_addr_accepted++;
712 if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
713 msk->pm.subflows >= subflows_max)
714 WRITE_ONCE(msk->pm.accept_addr, false);
715
716 spin_unlock_bh(&msk->pm.lock);
717 for (i = 0; i < nr; i++)
718 __mptcp_subflow_connect(sk, &addrs[i], &remote);
719 spin_lock_bh(&msk->pm.lock);
720}
721
722void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk)
723{
724 struct mptcp_subflow_context *subflow;
725
726 msk_owned_by_me(msk);
727 lockdep_assert_held(&msk->pm.lock);
728
729 if (!mptcp_pm_should_add_signal(msk) &&
730 !mptcp_pm_should_rm_signal(msk))
731 return;
732
733 subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node);
734 if (subflow)
735 mptcp_pm_send_ack(msk, subflow, false, false);
736}
737
738int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
739 struct mptcp_addr_info *addr,
740 struct mptcp_addr_info *rem,
741 u8 bkup)
742{
743 struct mptcp_subflow_context *subflow;
744
745 pr_debug("bkup=%d", bkup);
746
747 mptcp_for_each_subflow(msk, subflow) {
748 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
749 struct mptcp_addr_info local, remote;
750
751 local_address((struct sock_common *)ssk, &local);
752 if (!mptcp_addresses_equal(&local, addr, addr->port))
753 continue;
754
755 if (rem && rem->family != AF_UNSPEC) {
756 remote_address((struct sock_common *)ssk, &remote);
757 if (!mptcp_addresses_equal(&remote, rem, rem->port))
758 continue;
759 }
760
761 __mptcp_pm_send_ack(msk, subflow, true, bkup);
762 return 0;
763 }
764
765 return -EINVAL;
766}
767
768static bool mptcp_local_id_match(const struct mptcp_sock *msk, u8 local_id, u8 id)
769{
770 return local_id == id || (!local_id && msk->mpc_endpoint_id == id);
771}
772
773static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
774 const struct mptcp_rm_list *rm_list,
775 enum linux_mptcp_mib_field rm_type)
776{
777 struct mptcp_subflow_context *subflow, *tmp;
778 struct sock *sk = (struct sock *)msk;
779 u8 i;
780
781 pr_debug("%s rm_list_nr %d",
782 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr);
783
784 msk_owned_by_me(msk);
785
786 if (sk->sk_state == TCP_LISTEN)
787 return;
788
789 if (!rm_list->nr)
790 return;
791
792 if (list_empty(&msk->conn_list))
793 return;
794
795 for (i = 0; i < rm_list->nr; i++) {
796 u8 rm_id = rm_list->ids[i];
797 bool removed = false;
798
799 mptcp_for_each_subflow_safe(msk, subflow, tmp) {
800 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
801 int how = RCV_SHUTDOWN | SEND_SHUTDOWN;
802 u8 id = subflow->local_id;
803
804 if (rm_type == MPTCP_MIB_RMADDR && subflow->remote_id != rm_id)
805 continue;
806 if (rm_type == MPTCP_MIB_RMSUBFLOW && !mptcp_local_id_match(msk, id, rm_id))
807 continue;
808
809 pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u mpc_id=%u",
810 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow",
811 i, rm_id, subflow->local_id, subflow->remote_id,
812 msk->mpc_endpoint_id);
813 spin_unlock_bh(&msk->pm.lock);
814 mptcp_subflow_shutdown(sk, ssk, how);
815
816 /* the following takes care of updating the subflows counter */
817 mptcp_close_ssk(sk, ssk, subflow);
818 spin_lock_bh(&msk->pm.lock);
819
820 removed = true;
821 __MPTCP_INC_STATS(sock_net(sk), rm_type);
822 }
823 if (rm_type == MPTCP_MIB_RMSUBFLOW)
824 __set_bit(rm_id ? rm_id : msk->mpc_endpoint_id, msk->pm.id_avail_bitmap);
825 if (!removed)
826 continue;
827
828 if (!mptcp_pm_is_kernel(msk))
829 continue;
830
831 if (rm_type == MPTCP_MIB_RMADDR) {
832 msk->pm.add_addr_accepted--;
833 WRITE_ONCE(msk->pm.accept_addr, true);
834 } else if (rm_type == MPTCP_MIB_RMSUBFLOW) {
835 msk->pm.local_addr_used--;
836 }
837 }
838}
839
840static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)
841{
842 mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR);
843}
844
845void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
846 const struct mptcp_rm_list *rm_list)
847{
848 mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW);
849}
850
851void mptcp_pm_nl_work(struct mptcp_sock *msk)
852{
853 struct mptcp_pm_data *pm = &msk->pm;
854
855 msk_owned_by_me(msk);
856
857 if (!(pm->status & MPTCP_PM_WORK_MASK))
858 return;
859
860 spin_lock_bh(&msk->pm.lock);
861
862 pr_debug("msk=%p status=%x", msk, pm->status);
863 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) {
864 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);
865 mptcp_pm_nl_add_addr_received(msk);
866 }
867 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) {
868 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK);
869 mptcp_pm_nl_addr_send_ack(msk);
870 }
871 if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) {
872 pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED);
873 mptcp_pm_nl_rm_addr_received(msk);
874 }
875 if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) {
876 pm->status &= ~BIT(MPTCP_PM_ESTABLISHED);
877 mptcp_pm_nl_fully_established(msk);
878 }
879 if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) {
880 pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED);
881 mptcp_pm_nl_subflow_established(msk);
882 }
883
884 spin_unlock_bh(&msk->pm.lock);
885}
886
887static bool address_use_port(struct mptcp_pm_addr_entry *entry)
888{
889 return (entry->flags &
890 (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) ==
891 MPTCP_PM_ADDR_FLAG_SIGNAL;
892}
893
894/* caller must ensure the RCU grace period is already elapsed */
895static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry)
896{
897 if (entry->lsk)
898 sock_release(entry->lsk);
899 kfree(entry);
900}
901
902static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
903 struct mptcp_pm_addr_entry *entry)
904{
905 struct mptcp_pm_addr_entry *cur, *del_entry = NULL;
906 unsigned int addr_max;
907 int ret = -EINVAL;
908
909 spin_lock_bh(&pernet->lock);
910 /* to keep the code simple, don't do IDR-like allocation for address ID,
911 * just bail when we exceed limits
912 */
913 if (pernet->next_id == MPTCP_PM_MAX_ADDR_ID)
914 pernet->next_id = 1;
915 if (pernet->addrs >= MPTCP_PM_ADDR_MAX) {
916 ret = -ERANGE;
917 goto out;
918 }
919 if (test_bit(entry->addr.id, pernet->id_bitmap)) {
920 ret = -EBUSY;
921 goto out;
922 }
923
924 /* do not insert duplicate address, differentiate on port only
925 * singled addresses
926 */
927 if (!address_use_port(entry))
928 entry->addr.port = 0;
929 list_for_each_entry(cur, &pernet->local_addr_list, list) {
930 if (mptcp_addresses_equal(&cur->addr, &entry->addr,
931 cur->addr.port || entry->addr.port)) {
932 /* allow replacing the exiting endpoint only if such
933 * endpoint is an implicit one and the user-space
934 * did not provide an endpoint id
935 */
936 if (!(cur->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT)) {
937 ret = -EEXIST;
938 goto out;
939 }
940 if (entry->addr.id)
941 goto out;
942
943 pernet->addrs--;
944 entry->addr.id = cur->addr.id;
945 list_del_rcu(&cur->list);
946 del_entry = cur;
947 break;
948 }
949 }
950
951 if (!entry->addr.id) {
952find_next:
953 entry->addr.id = find_next_zero_bit(pernet->id_bitmap,
954 MPTCP_PM_MAX_ADDR_ID + 1,
955 pernet->next_id);
956 if (!entry->addr.id && pernet->next_id != 1) {
957 pernet->next_id = 1;
958 goto find_next;
959 }
960 }
961
962 if (!entry->addr.id)
963 goto out;
964
965 __set_bit(entry->addr.id, pernet->id_bitmap);
966 if (entry->addr.id > pernet->next_id)
967 pernet->next_id = entry->addr.id;
968
969 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
970 addr_max = pernet->add_addr_signal_max;
971 WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1);
972 }
973 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
974 addr_max = pernet->local_addr_max;
975 WRITE_ONCE(pernet->local_addr_max, addr_max + 1);
976 }
977
978 pernet->addrs++;
979 if (!entry->addr.port)
980 list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
981 else
982 list_add_rcu(&entry->list, &pernet->local_addr_list);
983 ret = entry->addr.id;
984
985out:
986 spin_unlock_bh(&pernet->lock);
987
988 /* just replaced an existing entry, free it */
989 if (del_entry) {
990 synchronize_rcu();
991 __mptcp_pm_release_addr_entry(del_entry);
992 }
993 return ret;
994}
995
996static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
997 struct mptcp_pm_addr_entry *entry)
998{
999 int addrlen = sizeof(struct sockaddr_in);
1000 struct sockaddr_storage addr;
1001 struct socket *ssock;
1002 struct sock *newsk;
1003 int backlog = 1024;
1004 int err;
1005
1006 err = sock_create_kern(sock_net(sk), entry->addr.family,
1007 SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk);
1008 if (err)
1009 return err;
1010
1011 newsk = entry->lsk->sk;
1012 if (!newsk)
1013 return -EINVAL;
1014
1015 lock_sock(newsk);
1016 ssock = __mptcp_nmpc_socket(mptcp_sk(newsk));
1017 release_sock(newsk);
1018 if (!ssock)
1019 return -EINVAL;
1020
1021 mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family);
1022#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1023 if (entry->addr.family == AF_INET6)
1024 addrlen = sizeof(struct sockaddr_in6);
1025#endif
1026 err = kernel_bind(ssock, (struct sockaddr *)&addr, addrlen);
1027 if (err)
1028 return err;
1029
1030 err = kernel_listen(ssock, backlog);
1031 if (err)
1032 return err;
1033
1034 mptcp_event_pm_listener(ssock->sk, MPTCP_EVENT_LISTENER_CREATED);
1035
1036 return 0;
1037}
1038
1039int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
1040{
1041 struct mptcp_pm_addr_entry *entry;
1042 struct mptcp_addr_info skc_local;
1043 struct mptcp_addr_info msk_local;
1044 struct pm_nl_pernet *pernet;
1045 int ret = -1;
1046
1047 if (WARN_ON_ONCE(!msk))
1048 return -1;
1049
1050 /* The 0 ID mapping is defined by the first subflow, copied into the msk
1051 * addr
1052 */
1053 local_address((struct sock_common *)msk, &msk_local);
1054 local_address((struct sock_common *)skc, &skc_local);
1055 if (mptcp_addresses_equal(&msk_local, &skc_local, false))
1056 return 0;
1057
1058 if (mptcp_pm_is_userspace(msk))
1059 return mptcp_userspace_pm_get_local_id(msk, &skc_local);
1060
1061 pernet = pm_nl_get_pernet_from_msk(msk);
1062
1063 rcu_read_lock();
1064 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
1065 if (mptcp_addresses_equal(&entry->addr, &skc_local, entry->addr.port)) {
1066 ret = entry->addr.id;
1067 break;
1068 }
1069 }
1070 rcu_read_unlock();
1071 if (ret >= 0)
1072 return ret;
1073
1074 /* address not found, add to local list */
1075 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1076 if (!entry)
1077 return -ENOMEM;
1078
1079 entry->addr = skc_local;
1080 entry->addr.id = 0;
1081 entry->addr.port = 0;
1082 entry->ifindex = 0;
1083 entry->flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
1084 entry->lsk = NULL;
1085 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
1086 if (ret < 0)
1087 kfree(entry);
1088
1089 return ret;
1090}
1091
1092#define MPTCP_PM_CMD_GRP_OFFSET 0
1093#define MPTCP_PM_EV_GRP_OFFSET 1
1094
1095static const struct genl_multicast_group mptcp_pm_mcgrps[] = {
1096 [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, },
1097 [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME,
1098 .flags = GENL_UNS_ADMIN_PERM,
1099 },
1100};
1101
1102static const struct nla_policy
1103mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = {
1104 [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
1105 [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
1106 [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
1107 [MPTCP_PM_ADDR_ATTR_ADDR6] =
1108 NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1109 [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 },
1110 [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 },
1111 [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 },
1112};
1113
1114static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = {
1115 [MPTCP_PM_ATTR_ADDR] =
1116 NLA_POLICY_NESTED(mptcp_pm_addr_policy),
1117 [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, },
1118 [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, },
1119 [MPTCP_PM_ATTR_TOKEN] = { .type = NLA_U32, },
1120 [MPTCP_PM_ATTR_LOC_ID] = { .type = NLA_U8, },
1121 [MPTCP_PM_ATTR_ADDR_REMOTE] =
1122 NLA_POLICY_NESTED(mptcp_pm_addr_policy),
1123};
1124
1125void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)
1126{
1127 struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk);
1128 struct sock *sk = (struct sock *)msk;
1129 unsigned int active_max_loss_cnt;
1130 struct net *net = sock_net(sk);
1131 unsigned int stale_loss_cnt;
1132 bool slow;
1133
1134 stale_loss_cnt = mptcp_stale_loss_cnt(net);
1135 if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt)
1136 return;
1137
1138 /* look for another available subflow not in loss state */
1139 active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1);
1140 mptcp_for_each_subflow(msk, iter) {
1141 if (iter != subflow && mptcp_subflow_active(iter) &&
1142 iter->stale_count < active_max_loss_cnt) {
1143 /* we have some alternatives, try to mark this subflow as idle ...*/
1144 slow = lock_sock_fast(ssk);
1145 if (!tcp_rtx_and_write_queues_empty(ssk)) {
1146 subflow->stale = 1;
1147 __mptcp_retransmit_pending_data(sk);
1148 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_SUBFLOWSTALE);
1149 }
1150 unlock_sock_fast(ssk, slow);
1151
1152 /* always try to push the pending data regardless of re-injections:
1153 * we can possibly use backup subflows now, and subflow selection
1154 * is cheap under the msk socket lock
1155 */
1156 __mptcp_push_pending(sk, 0);
1157 return;
1158 }
1159 }
1160}
1161
1162static int mptcp_pm_family_to_addr(int family)
1163{
1164#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1165 if (family == AF_INET6)
1166 return MPTCP_PM_ADDR_ATTR_ADDR6;
1167#endif
1168 return MPTCP_PM_ADDR_ATTR_ADDR4;
1169}
1170
1171static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[],
1172 const struct nlattr *attr,
1173 struct genl_info *info,
1174 struct mptcp_addr_info *addr,
1175 bool require_family)
1176{
1177 int err, addr_addr;
1178
1179 if (!attr) {
1180 GENL_SET_ERR_MSG(info, "missing address info");
1181 return -EINVAL;
1182 }
1183
1184 /* no validation needed - was already done via nested policy */
1185 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr,
1186 mptcp_pm_addr_policy, info->extack);
1187 if (err)
1188 return err;
1189
1190 if (tb[MPTCP_PM_ADDR_ATTR_ID])
1191 addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
1192
1193 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
1194 if (!require_family)
1195 return 0;
1196
1197 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1198 "missing family");
1199 return -EINVAL;
1200 }
1201
1202 addr->family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]);
1203 if (addr->family != AF_INET
1204#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1205 && addr->family != AF_INET6
1206#endif
1207 ) {
1208 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1209 "unknown address family");
1210 return -EINVAL;
1211 }
1212 addr_addr = mptcp_pm_family_to_addr(addr->family);
1213 if (!tb[addr_addr]) {
1214 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1215 "missing address data");
1216 return -EINVAL;
1217 }
1218
1219#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1220 if (addr->family == AF_INET6)
1221 addr->addr6 = nla_get_in6_addr(tb[addr_addr]);
1222 else
1223#endif
1224 addr->addr.s_addr = nla_get_in_addr(tb[addr_addr]);
1225
1226 if (tb[MPTCP_PM_ADDR_ATTR_PORT])
1227 addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
1228
1229 return 0;
1230}
1231
1232int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
1233 struct mptcp_addr_info *addr)
1234{
1235 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
1236
1237 memset(addr, 0, sizeof(*addr));
1238
1239 return mptcp_pm_parse_pm_addr_attr(tb, attr, info, addr, true);
1240}
1241
1242int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
1243 bool require_family,
1244 struct mptcp_pm_addr_entry *entry)
1245{
1246 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
1247 int err;
1248
1249 memset(entry, 0, sizeof(*entry));
1250
1251 err = mptcp_pm_parse_pm_addr_attr(tb, attr, info, &entry->addr, require_family);
1252 if (err)
1253 return err;
1254
1255 if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) {
1256 u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]);
1257
1258 entry->ifindex = val;
1259 }
1260
1261 if (tb[MPTCP_PM_ADDR_ATTR_FLAGS])
1262 entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
1263
1264 if (tb[MPTCP_PM_ADDR_ATTR_PORT])
1265 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
1266
1267 return 0;
1268}
1269
1270static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info)
1271{
1272 return pm_nl_get_pernet(genl_info_net(info));
1273}
1274
1275static int mptcp_nl_add_subflow_or_signal_addr(struct net *net)
1276{
1277 struct mptcp_sock *msk;
1278 long s_slot = 0, s_num = 0;
1279
1280 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1281 struct sock *sk = (struct sock *)msk;
1282
1283 if (!READ_ONCE(msk->fully_established) ||
1284 mptcp_pm_is_userspace(msk))
1285 goto next;
1286
1287 lock_sock(sk);
1288 spin_lock_bh(&msk->pm.lock);
1289 mptcp_pm_create_subflow_or_signal_addr(msk);
1290 spin_unlock_bh(&msk->pm.lock);
1291 release_sock(sk);
1292
1293next:
1294 sock_put(sk);
1295 cond_resched();
1296 }
1297
1298 return 0;
1299}
1300
1301static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
1302{
1303 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1304 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1305 struct mptcp_pm_addr_entry addr, *entry;
1306 int ret;
1307
1308 ret = mptcp_pm_parse_entry(attr, info, true, &addr);
1309 if (ret < 0)
1310 return ret;
1311
1312 if (addr.addr.port && !(addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
1313 GENL_SET_ERR_MSG(info, "flags must have signal when using port");
1314 return -EINVAL;
1315 }
1316
1317 if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL &&
1318 addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) {
1319 GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh");
1320 return -EINVAL;
1321 }
1322
1323 if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) {
1324 GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint");
1325 return -EINVAL;
1326 }
1327
1328 entry = kzalloc(sizeof(*entry), GFP_KERNEL_ACCOUNT);
1329 if (!entry) {
1330 GENL_SET_ERR_MSG(info, "can't allocate addr");
1331 return -ENOMEM;
1332 }
1333
1334 *entry = addr;
1335 if (entry->addr.port) {
1336 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry);
1337 if (ret) {
1338 GENL_SET_ERR_MSG_FMT(info, "create listen socket error: %d", ret);
1339 goto out_free;
1340 }
1341 }
1342 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
1343 if (ret < 0) {
1344 GENL_SET_ERR_MSG_FMT(info, "too many addresses or duplicate one: %d", ret);
1345 goto out_free;
1346 }
1347
1348 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk));
1349 return 0;
1350
1351out_free:
1352 __mptcp_pm_release_addr_entry(entry);
1353 return ret;
1354}
1355
1356int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
1357 u8 *flags, int *ifindex)
1358{
1359 struct mptcp_pm_addr_entry *entry;
1360 struct sock *sk = (struct sock *)msk;
1361 struct net *net = sock_net(sk);
1362
1363 *flags = 0;
1364 *ifindex = 0;
1365
1366 if (id) {
1367 if (mptcp_pm_is_userspace(msk))
1368 return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
1369 id,
1370 flags,
1371 ifindex);
1372
1373 rcu_read_lock();
1374 entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
1375 if (entry) {
1376 *flags = entry->flags;
1377 *ifindex = entry->ifindex;
1378 }
1379 rcu_read_unlock();
1380 }
1381
1382 return 0;
1383}
1384
1385static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
1386 const struct mptcp_addr_info *addr)
1387{
1388 struct mptcp_pm_add_entry *entry;
1389
1390 entry = mptcp_pm_del_add_timer(msk, addr, false);
1391 if (entry) {
1392 list_del(&entry->list);
1393 kfree(entry);
1394 return true;
1395 }
1396
1397 return false;
1398}
1399
1400static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk,
1401 const struct mptcp_addr_info *addr,
1402 bool force)
1403{
1404 struct mptcp_rm_list list = { .nr = 0 };
1405 bool ret;
1406
1407 list.ids[list.nr++] = addr->id;
1408
1409 ret = remove_anno_list_by_saddr(msk, addr);
1410 if (ret || force) {
1411 spin_lock_bh(&msk->pm.lock);
1412 mptcp_pm_remove_addr(msk, &list);
1413 spin_unlock_bh(&msk->pm.lock);
1414 }
1415 return ret;
1416}
1417
1418static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
1419 const struct mptcp_pm_addr_entry *entry)
1420{
1421 const struct mptcp_addr_info *addr = &entry->addr;
1422 struct mptcp_rm_list list = { .nr = 0 };
1423 long s_slot = 0, s_num = 0;
1424 struct mptcp_sock *msk;
1425
1426 pr_debug("remove_id=%d", addr->id);
1427
1428 list.ids[list.nr++] = addr->id;
1429
1430 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1431 struct sock *sk = (struct sock *)msk;
1432 bool remove_subflow;
1433
1434 if (mptcp_pm_is_userspace(msk))
1435 goto next;
1436
1437 if (list_empty(&msk->conn_list)) {
1438 mptcp_pm_remove_anno_addr(msk, addr, false);
1439 goto next;
1440 }
1441
1442 lock_sock(sk);
1443 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr);
1444 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow &&
1445 !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT));
1446 if (remove_subflow)
1447 mptcp_pm_remove_subflow(msk, &list);
1448 release_sock(sk);
1449
1450next:
1451 sock_put(sk);
1452 cond_resched();
1453 }
1454
1455 return 0;
1456}
1457
1458static int mptcp_nl_remove_id_zero_address(struct net *net,
1459 struct mptcp_addr_info *addr)
1460{
1461 struct mptcp_rm_list list = { .nr = 0 };
1462 long s_slot = 0, s_num = 0;
1463 struct mptcp_sock *msk;
1464
1465 list.ids[list.nr++] = 0;
1466
1467 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1468 struct sock *sk = (struct sock *)msk;
1469 struct mptcp_addr_info msk_local;
1470
1471 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
1472 goto next;
1473
1474 local_address((struct sock_common *)msk, &msk_local);
1475 if (!mptcp_addresses_equal(&msk_local, addr, addr->port))
1476 goto next;
1477
1478 lock_sock(sk);
1479 spin_lock_bh(&msk->pm.lock);
1480 mptcp_pm_remove_addr(msk, &list);
1481 mptcp_pm_nl_rm_subflow_received(msk, &list);
1482 spin_unlock_bh(&msk->pm.lock);
1483 release_sock(sk);
1484
1485next:
1486 sock_put(sk);
1487 cond_resched();
1488 }
1489
1490 return 0;
1491}
1492
1493static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
1494{
1495 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1496 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1497 struct mptcp_pm_addr_entry addr, *entry;
1498 unsigned int addr_max;
1499 int ret;
1500
1501 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1502 if (ret < 0)
1503 return ret;
1504
1505 /* the zero id address is special: the first address used by the msk
1506 * always gets such an id, so different subflows can have different zero
1507 * id addresses. Additionally zero id is not accounted for in id_bitmap.
1508 * Let's use an 'mptcp_rm_list' instead of the common remove code.
1509 */
1510 if (addr.addr.id == 0)
1511 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr);
1512
1513 spin_lock_bh(&pernet->lock);
1514 entry = __lookup_addr_by_id(pernet, addr.addr.id);
1515 if (!entry) {
1516 GENL_SET_ERR_MSG(info, "address not found");
1517 spin_unlock_bh(&pernet->lock);
1518 return -EINVAL;
1519 }
1520 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
1521 addr_max = pernet->add_addr_signal_max;
1522 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1);
1523 }
1524 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
1525 addr_max = pernet->local_addr_max;
1526 WRITE_ONCE(pernet->local_addr_max, addr_max - 1);
1527 }
1528
1529 pernet->addrs--;
1530 list_del_rcu(&entry->list);
1531 __clear_bit(entry->addr.id, pernet->id_bitmap);
1532 spin_unlock_bh(&pernet->lock);
1533
1534 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), entry);
1535 synchronize_rcu();
1536 __mptcp_pm_release_addr_entry(entry);
1537
1538 return ret;
1539}
1540
1541void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
1542 struct list_head *rm_list)
1543{
1544 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 };
1545 struct mptcp_pm_addr_entry *entry;
1546
1547 list_for_each_entry(entry, rm_list, list) {
1548 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) &&
1549 slist.nr < MPTCP_RM_IDS_MAX)
1550 slist.ids[slist.nr++] = entry->addr.id;
1551
1552 if (remove_anno_list_by_saddr(msk, &entry->addr) &&
1553 alist.nr < MPTCP_RM_IDS_MAX)
1554 alist.ids[alist.nr++] = entry->addr.id;
1555 }
1556
1557 if (alist.nr) {
1558 spin_lock_bh(&msk->pm.lock);
1559 mptcp_pm_remove_addr(msk, &alist);
1560 spin_unlock_bh(&msk->pm.lock);
1561 }
1562 if (slist.nr)
1563 mptcp_pm_remove_subflow(msk, &slist);
1564}
1565
1566static void mptcp_nl_remove_addrs_list(struct net *net,
1567 struct list_head *rm_list)
1568{
1569 long s_slot = 0, s_num = 0;
1570 struct mptcp_sock *msk;
1571
1572 if (list_empty(rm_list))
1573 return;
1574
1575 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1576 struct sock *sk = (struct sock *)msk;
1577
1578 if (!mptcp_pm_is_userspace(msk)) {
1579 lock_sock(sk);
1580 mptcp_pm_remove_addrs_and_subflows(msk, rm_list);
1581 release_sock(sk);
1582 }
1583
1584 sock_put(sk);
1585 cond_resched();
1586 }
1587}
1588
1589/* caller must ensure the RCU grace period is already elapsed */
1590static void __flush_addrs(struct list_head *list)
1591{
1592 while (!list_empty(list)) {
1593 struct mptcp_pm_addr_entry *cur;
1594
1595 cur = list_entry(list->next,
1596 struct mptcp_pm_addr_entry, list);
1597 list_del_rcu(&cur->list);
1598 __mptcp_pm_release_addr_entry(cur);
1599 }
1600}
1601
1602static void __reset_counters(struct pm_nl_pernet *pernet)
1603{
1604 WRITE_ONCE(pernet->add_addr_signal_max, 0);
1605 WRITE_ONCE(pernet->add_addr_accept_max, 0);
1606 WRITE_ONCE(pernet->local_addr_max, 0);
1607 pernet->addrs = 0;
1608}
1609
1610static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info)
1611{
1612 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1613 LIST_HEAD(free_list);
1614
1615 spin_lock_bh(&pernet->lock);
1616 list_splice_init(&pernet->local_addr_list, &free_list);
1617 __reset_counters(pernet);
1618 pernet->next_id = 1;
1619 bitmap_zero(pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
1620 spin_unlock_bh(&pernet->lock);
1621 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list);
1622 synchronize_rcu();
1623 __flush_addrs(&free_list);
1624 return 0;
1625}
1626
1627static int mptcp_nl_fill_addr(struct sk_buff *skb,
1628 struct mptcp_pm_addr_entry *entry)
1629{
1630 struct mptcp_addr_info *addr = &entry->addr;
1631 struct nlattr *attr;
1632
1633 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR);
1634 if (!attr)
1635 return -EMSGSIZE;
1636
1637 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family))
1638 goto nla_put_failure;
1639 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port)))
1640 goto nla_put_failure;
1641 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id))
1642 goto nla_put_failure;
1643 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags))
1644 goto nla_put_failure;
1645 if (entry->ifindex &&
1646 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex))
1647 goto nla_put_failure;
1648
1649 if (addr->family == AF_INET &&
1650 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4,
1651 addr->addr.s_addr))
1652 goto nla_put_failure;
1653#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1654 else if (addr->family == AF_INET6 &&
1655 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6))
1656 goto nla_put_failure;
1657#endif
1658 nla_nest_end(skb, attr);
1659 return 0;
1660
1661nla_put_failure:
1662 nla_nest_cancel(skb, attr);
1663 return -EMSGSIZE;
1664}
1665
1666static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info)
1667{
1668 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1669 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1670 struct mptcp_pm_addr_entry addr, *entry;
1671 struct sk_buff *msg;
1672 void *reply;
1673 int ret;
1674
1675 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1676 if (ret < 0)
1677 return ret;
1678
1679 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1680 if (!msg)
1681 return -ENOMEM;
1682
1683 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
1684 info->genlhdr->cmd);
1685 if (!reply) {
1686 GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
1687 ret = -EMSGSIZE;
1688 goto fail;
1689 }
1690
1691 spin_lock_bh(&pernet->lock);
1692 entry = __lookup_addr_by_id(pernet, addr.addr.id);
1693 if (!entry) {
1694 GENL_SET_ERR_MSG(info, "address not found");
1695 ret = -EINVAL;
1696 goto unlock_fail;
1697 }
1698
1699 ret = mptcp_nl_fill_addr(msg, entry);
1700 if (ret)
1701 goto unlock_fail;
1702
1703 genlmsg_end(msg, reply);
1704 ret = genlmsg_reply(msg, info);
1705 spin_unlock_bh(&pernet->lock);
1706 return ret;
1707
1708unlock_fail:
1709 spin_unlock_bh(&pernet->lock);
1710
1711fail:
1712 nlmsg_free(msg);
1713 return ret;
1714}
1715
1716static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg,
1717 struct netlink_callback *cb)
1718{
1719 struct net *net = sock_net(msg->sk);
1720 struct mptcp_pm_addr_entry *entry;
1721 struct pm_nl_pernet *pernet;
1722 int id = cb->args[0];
1723 void *hdr;
1724 int i;
1725
1726 pernet = pm_nl_get_pernet(net);
1727
1728 spin_lock_bh(&pernet->lock);
1729 for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) {
1730 if (test_bit(i, pernet->id_bitmap)) {
1731 entry = __lookup_addr_by_id(pernet, i);
1732 if (!entry)
1733 break;
1734
1735 if (entry->addr.id <= id)
1736 continue;
1737
1738 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid,
1739 cb->nlh->nlmsg_seq, &mptcp_genl_family,
1740 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR);
1741 if (!hdr)
1742 break;
1743
1744 if (mptcp_nl_fill_addr(msg, entry) < 0) {
1745 genlmsg_cancel(msg, hdr);
1746 break;
1747 }
1748
1749 id = entry->addr.id;
1750 genlmsg_end(msg, hdr);
1751 }
1752 }
1753 spin_unlock_bh(&pernet->lock);
1754
1755 cb->args[0] = id;
1756 return msg->len;
1757}
1758
1759static int parse_limit(struct genl_info *info, int id, unsigned int *limit)
1760{
1761 struct nlattr *attr = info->attrs[id];
1762
1763 if (!attr)
1764 return 0;
1765
1766 *limit = nla_get_u32(attr);
1767 if (*limit > MPTCP_PM_ADDR_MAX) {
1768 GENL_SET_ERR_MSG(info, "limit greater than maximum");
1769 return -EINVAL;
1770 }
1771 return 0;
1772}
1773
1774static int
1775mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info)
1776{
1777 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1778 unsigned int rcv_addrs, subflows;
1779 int ret;
1780
1781 spin_lock_bh(&pernet->lock);
1782 rcv_addrs = pernet->add_addr_accept_max;
1783 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs);
1784 if (ret)
1785 goto unlock;
1786
1787 subflows = pernet->subflows_max;
1788 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows);
1789 if (ret)
1790 goto unlock;
1791
1792 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs);
1793 WRITE_ONCE(pernet->subflows_max, subflows);
1794
1795unlock:
1796 spin_unlock_bh(&pernet->lock);
1797 return ret;
1798}
1799
1800static int
1801mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info)
1802{
1803 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1804 struct sk_buff *msg;
1805 void *reply;
1806
1807 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1808 if (!msg)
1809 return -ENOMEM;
1810
1811 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
1812 MPTCP_PM_CMD_GET_LIMITS);
1813 if (!reply)
1814 goto fail;
1815
1816 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS,
1817 READ_ONCE(pernet->add_addr_accept_max)))
1818 goto fail;
1819
1820 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS,
1821 READ_ONCE(pernet->subflows_max)))
1822 goto fail;
1823
1824 genlmsg_end(msg, reply);
1825 return genlmsg_reply(msg, info);
1826
1827fail:
1828 GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
1829 nlmsg_free(msg);
1830 return -EMSGSIZE;
1831}
1832
1833static void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk,
1834 struct mptcp_addr_info *addr)
1835{
1836 struct mptcp_rm_list list = { .nr = 0 };
1837
1838 list.ids[list.nr++] = addr->id;
1839
1840 spin_lock_bh(&msk->pm.lock);
1841 mptcp_pm_nl_rm_subflow_received(msk, &list);
1842 mptcp_pm_create_subflow_or_signal_addr(msk);
1843 spin_unlock_bh(&msk->pm.lock);
1844}
1845
1846static int mptcp_nl_set_flags(struct net *net,
1847 struct mptcp_addr_info *addr,
1848 u8 bkup, u8 changed)
1849{
1850 long s_slot = 0, s_num = 0;
1851 struct mptcp_sock *msk;
1852 int ret = -EINVAL;
1853
1854 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1855 struct sock *sk = (struct sock *)msk;
1856
1857 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
1858 goto next;
1859
1860 lock_sock(sk);
1861 if (changed & MPTCP_PM_ADDR_FLAG_BACKUP)
1862 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup);
1863 if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH)
1864 mptcp_pm_nl_fullmesh(msk, addr);
1865 release_sock(sk);
1866
1867next:
1868 sock_put(sk);
1869 cond_resched();
1870 }
1871
1872 return ret;
1873}
1874
1875static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
1876{
1877 struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
1878 struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, };
1879 struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
1880 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
1881 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1882 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1883 u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
1884 MPTCP_PM_ADDR_FLAG_FULLMESH;
1885 struct net *net = sock_net(skb->sk);
1886 u8 bkup = 0, lookup_by_id = 0;
1887 int ret;
1888
1889 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1890 if (ret < 0)
1891 return ret;
1892
1893 if (attr_rem) {
1894 ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote);
1895 if (ret < 0)
1896 return ret;
1897 }
1898
1899 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
1900 bkup = 1;
1901 if (addr.addr.family == AF_UNSPEC) {
1902 lookup_by_id = 1;
1903 if (!addr.addr.id)
1904 return -EOPNOTSUPP;
1905 }
1906
1907 if (token)
1908 return mptcp_userspace_pm_set_flags(sock_net(skb->sk),
1909 token, &addr, &remote, bkup);
1910
1911 spin_lock_bh(&pernet->lock);
1912 entry = __lookup_addr(pernet, &addr.addr, lookup_by_id);
1913 if (!entry) {
1914 spin_unlock_bh(&pernet->lock);
1915 return -EINVAL;
1916 }
1917 if ((addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) &&
1918 (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
1919 spin_unlock_bh(&pernet->lock);
1920 return -EINVAL;
1921 }
1922
1923 changed = (addr.flags ^ entry->flags) & mask;
1924 entry->flags = (entry->flags & ~mask) | (addr.flags & mask);
1925 addr = *entry;
1926 spin_unlock_bh(&pernet->lock);
1927
1928 mptcp_nl_set_flags(net, &addr.addr, bkup, changed);
1929 return 0;
1930}
1931
1932static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp)
1933{
1934 genlmsg_multicast_netns(&mptcp_genl_family, net,
1935 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp);
1936}
1937
1938bool mptcp_userspace_pm_active(const struct mptcp_sock *msk)
1939{
1940 return genl_has_listeners(&mptcp_genl_family,
1941 sock_net((const struct sock *)msk),
1942 MPTCP_PM_EV_GRP_OFFSET);
1943}
1944
1945static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk)
1946{
1947 const struct inet_sock *issk = inet_sk(ssk);
1948 const struct mptcp_subflow_context *sf;
1949
1950 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
1951 return -EMSGSIZE;
1952
1953 switch (ssk->sk_family) {
1954 case AF_INET:
1955 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
1956 return -EMSGSIZE;
1957 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr))
1958 return -EMSGSIZE;
1959 break;
1960#if IS_ENABLED(CONFIG_MPTCP_IPV6)
1961 case AF_INET6: {
1962 const struct ipv6_pinfo *np = inet6_sk(ssk);
1963
1964 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
1965 return -EMSGSIZE;
1966 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr))
1967 return -EMSGSIZE;
1968 break;
1969 }
1970#endif
1971 default:
1972 WARN_ON_ONCE(1);
1973 return -EMSGSIZE;
1974 }
1975
1976 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
1977 return -EMSGSIZE;
1978 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport))
1979 return -EMSGSIZE;
1980
1981 sf = mptcp_subflow_ctx(ssk);
1982 if (WARN_ON_ONCE(!sf))
1983 return -EINVAL;
1984
1985 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id))
1986 return -EMSGSIZE;
1987
1988 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id))
1989 return -EMSGSIZE;
1990
1991 return 0;
1992}
1993
1994static int mptcp_event_put_token_and_ssk(struct sk_buff *skb,
1995 const struct mptcp_sock *msk,
1996 const struct sock *ssk)
1997{
1998 const struct sock *sk = (const struct sock *)msk;
1999 const struct mptcp_subflow_context *sf;
2000 u8 sk_err;
2001
2002 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
2003 return -EMSGSIZE;
2004
2005 if (mptcp_event_add_subflow(skb, ssk))
2006 return -EMSGSIZE;
2007
2008 sf = mptcp_subflow_ctx(ssk);
2009 if (WARN_ON_ONCE(!sf))
2010 return -EINVAL;
2011
2012 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup))
2013 return -EMSGSIZE;
2014
2015 if (ssk->sk_bound_dev_if &&
2016 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if))
2017 return -EMSGSIZE;
2018
2019 sk_err = ssk->sk_err;
2020 if (sk_err && sk->sk_state == TCP_ESTABLISHED &&
2021 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err))
2022 return -EMSGSIZE;
2023
2024 return 0;
2025}
2026
2027static int mptcp_event_sub_established(struct sk_buff *skb,
2028 const struct mptcp_sock *msk,
2029 const struct sock *ssk)
2030{
2031 return mptcp_event_put_token_and_ssk(skb, msk, ssk);
2032}
2033
2034static int mptcp_event_sub_closed(struct sk_buff *skb,
2035 const struct mptcp_sock *msk,
2036 const struct sock *ssk)
2037{
2038 const struct mptcp_subflow_context *sf;
2039
2040 if (mptcp_event_put_token_and_ssk(skb, msk, ssk))
2041 return -EMSGSIZE;
2042
2043 sf = mptcp_subflow_ctx(ssk);
2044 if (!sf->reset_seen)
2045 return 0;
2046
2047 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason))
2048 return -EMSGSIZE;
2049
2050 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient))
2051 return -EMSGSIZE;
2052
2053 return 0;
2054}
2055
2056static int mptcp_event_created(struct sk_buff *skb,
2057 const struct mptcp_sock *msk,
2058 const struct sock *ssk)
2059{
2060 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token);
2061
2062 if (err)
2063 return err;
2064
2065 if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side)))
2066 return -EMSGSIZE;
2067
2068 return mptcp_event_add_subflow(skb, ssk);
2069}
2070
2071void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id)
2072{
2073 struct net *net = sock_net((const struct sock *)msk);
2074 struct nlmsghdr *nlh;
2075 struct sk_buff *skb;
2076
2077 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2078 return;
2079
2080 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2081 if (!skb)
2082 return;
2083
2084 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED);
2085 if (!nlh)
2086 goto nla_put_failure;
2087
2088 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
2089 goto nla_put_failure;
2090
2091 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id))
2092 goto nla_put_failure;
2093
2094 genlmsg_end(skb, nlh);
2095 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
2096 return;
2097
2098nla_put_failure:
2099 nlmsg_free(skb);
2100}
2101
2102void mptcp_event_addr_announced(const struct sock *ssk,
2103 const struct mptcp_addr_info *info)
2104{
2105 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
2106 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
2107 struct net *net = sock_net(ssk);
2108 struct nlmsghdr *nlh;
2109 struct sk_buff *skb;
2110
2111 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2112 return;
2113
2114 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2115 if (!skb)
2116 return;
2117
2118 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0,
2119 MPTCP_EVENT_ANNOUNCED);
2120 if (!nlh)
2121 goto nla_put_failure;
2122
2123 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
2124 goto nla_put_failure;
2125
2126 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id))
2127 goto nla_put_failure;
2128
2129 if (nla_put_be16(skb, MPTCP_ATTR_DPORT,
2130 info->port == 0 ?
2131 inet_sk(ssk)->inet_dport :
2132 info->port))
2133 goto nla_put_failure;
2134
2135 switch (info->family) {
2136 case AF_INET:
2137 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr))
2138 goto nla_put_failure;
2139 break;
2140#if IS_ENABLED(CONFIG_MPTCP_IPV6)
2141 case AF_INET6:
2142 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6))
2143 goto nla_put_failure;
2144 break;
2145#endif
2146 default:
2147 WARN_ON_ONCE(1);
2148 goto nla_put_failure;
2149 }
2150
2151 genlmsg_end(skb, nlh);
2152 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
2153 return;
2154
2155nla_put_failure:
2156 nlmsg_free(skb);
2157}
2158
2159void mptcp_event_pm_listener(const struct sock *ssk,
2160 enum mptcp_event_type event)
2161{
2162 const struct inet_sock *issk = inet_sk(ssk);
2163 struct net *net = sock_net(ssk);
2164 struct nlmsghdr *nlh;
2165 struct sk_buff *skb;
2166
2167 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2168 return;
2169
2170 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2171 if (!skb)
2172 return;
2173
2174 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, event);
2175 if (!nlh)
2176 goto nla_put_failure;
2177
2178 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
2179 goto nla_put_failure;
2180
2181 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
2182 goto nla_put_failure;
2183
2184 switch (ssk->sk_family) {
2185 case AF_INET:
2186 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
2187 goto nla_put_failure;
2188 break;
2189#if IS_ENABLED(CONFIG_MPTCP_IPV6)
2190 case AF_INET6: {
2191 const struct ipv6_pinfo *np = inet6_sk(ssk);
2192
2193 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
2194 goto nla_put_failure;
2195 break;
2196 }
2197#endif
2198 default:
2199 WARN_ON_ONCE(1);
2200 goto nla_put_failure;
2201 }
2202
2203 genlmsg_end(skb, nlh);
2204 mptcp_nl_mcast_send(net, skb, GFP_KERNEL);
2205 return;
2206
2207nla_put_failure:
2208 nlmsg_free(skb);
2209}
2210
2211void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
2212 const struct sock *ssk, gfp_t gfp)
2213{
2214 struct net *net = sock_net((const struct sock *)msk);
2215 struct nlmsghdr *nlh;
2216 struct sk_buff *skb;
2217
2218 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2219 return;
2220
2221 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
2222 if (!skb)
2223 return;
2224
2225 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type);
2226 if (!nlh)
2227 goto nla_put_failure;
2228
2229 switch (type) {
2230 case MPTCP_EVENT_UNSPEC:
2231 WARN_ON_ONCE(1);
2232 break;
2233 case MPTCP_EVENT_CREATED:
2234 case MPTCP_EVENT_ESTABLISHED:
2235 if (mptcp_event_created(skb, msk, ssk) < 0)
2236 goto nla_put_failure;
2237 break;
2238 case MPTCP_EVENT_CLOSED:
2239 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0)
2240 goto nla_put_failure;
2241 break;
2242 case MPTCP_EVENT_ANNOUNCED:
2243 case MPTCP_EVENT_REMOVED:
2244 /* call mptcp_event_addr_announced()/removed instead */
2245 WARN_ON_ONCE(1);
2246 break;
2247 case MPTCP_EVENT_SUB_ESTABLISHED:
2248 case MPTCP_EVENT_SUB_PRIORITY:
2249 if (mptcp_event_sub_established(skb, msk, ssk) < 0)
2250 goto nla_put_failure;
2251 break;
2252 case MPTCP_EVENT_SUB_CLOSED:
2253 if (mptcp_event_sub_closed(skb, msk, ssk) < 0)
2254 goto nla_put_failure;
2255 break;
2256 case MPTCP_EVENT_LISTENER_CREATED:
2257 case MPTCP_EVENT_LISTENER_CLOSED:
2258 break;
2259 }
2260
2261 genlmsg_end(skb, nlh);
2262 mptcp_nl_mcast_send(net, skb, gfp);
2263 return;
2264
2265nla_put_failure:
2266 nlmsg_free(skb);
2267}
2268
2269static const struct genl_small_ops mptcp_pm_ops[] = {
2270 {
2271 .cmd = MPTCP_PM_CMD_ADD_ADDR,
2272 .doit = mptcp_nl_cmd_add_addr,
2273 .flags = GENL_UNS_ADMIN_PERM,
2274 },
2275 {
2276 .cmd = MPTCP_PM_CMD_DEL_ADDR,
2277 .doit = mptcp_nl_cmd_del_addr,
2278 .flags = GENL_UNS_ADMIN_PERM,
2279 },
2280 {
2281 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS,
2282 .doit = mptcp_nl_cmd_flush_addrs,
2283 .flags = GENL_UNS_ADMIN_PERM,
2284 },
2285 {
2286 .cmd = MPTCP_PM_CMD_GET_ADDR,
2287 .doit = mptcp_nl_cmd_get_addr,
2288 .dumpit = mptcp_nl_cmd_dump_addrs,
2289 },
2290 {
2291 .cmd = MPTCP_PM_CMD_SET_LIMITS,
2292 .doit = mptcp_nl_cmd_set_limits,
2293 .flags = GENL_UNS_ADMIN_PERM,
2294 },
2295 {
2296 .cmd = MPTCP_PM_CMD_GET_LIMITS,
2297 .doit = mptcp_nl_cmd_get_limits,
2298 },
2299 {
2300 .cmd = MPTCP_PM_CMD_SET_FLAGS,
2301 .doit = mptcp_nl_cmd_set_flags,
2302 .flags = GENL_UNS_ADMIN_PERM,
2303 },
2304 {
2305 .cmd = MPTCP_PM_CMD_ANNOUNCE,
2306 .doit = mptcp_nl_cmd_announce,
2307 .flags = GENL_UNS_ADMIN_PERM,
2308 },
2309 {
2310 .cmd = MPTCP_PM_CMD_REMOVE,
2311 .doit = mptcp_nl_cmd_remove,
2312 .flags = GENL_UNS_ADMIN_PERM,
2313 },
2314 {
2315 .cmd = MPTCP_PM_CMD_SUBFLOW_CREATE,
2316 .doit = mptcp_nl_cmd_sf_create,
2317 .flags = GENL_UNS_ADMIN_PERM,
2318 },
2319 {
2320 .cmd = MPTCP_PM_CMD_SUBFLOW_DESTROY,
2321 .doit = mptcp_nl_cmd_sf_destroy,
2322 .flags = GENL_UNS_ADMIN_PERM,
2323 },
2324};
2325
2326static struct genl_family mptcp_genl_family __ro_after_init = {
2327 .name = MPTCP_PM_NAME,
2328 .version = MPTCP_PM_VER,
2329 .maxattr = MPTCP_PM_ATTR_MAX,
2330 .policy = mptcp_pm_policy,
2331 .netnsok = true,
2332 .module = THIS_MODULE,
2333 .small_ops = mptcp_pm_ops,
2334 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops),
2335 .resv_start_op = MPTCP_PM_CMD_SUBFLOW_DESTROY + 1,
2336 .mcgrps = mptcp_pm_mcgrps,
2337 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps),
2338};
2339
2340static int __net_init pm_nl_init_net(struct net *net)
2341{
2342 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net);
2343
2344 INIT_LIST_HEAD_RCU(&pernet->local_addr_list);
2345
2346 /* Cit. 2 subflows ought to be enough for anybody. */
2347 pernet->subflows_max = 2;
2348 pernet->next_id = 1;
2349 pernet->stale_loss_cnt = 4;
2350 spin_lock_init(&pernet->lock);
2351
2352 /* No need to initialize other pernet fields, the struct is zeroed at
2353 * allocation time.
2354 */
2355
2356 return 0;
2357}
2358
2359static void __net_exit pm_nl_exit_net(struct list_head *net_list)
2360{
2361 struct net *net;
2362
2363 list_for_each_entry(net, net_list, exit_list) {
2364 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net);
2365
2366 /* net is removed from namespace list, can't race with
2367 * other modifiers, also netns core already waited for a
2368 * RCU grace period.
2369 */
2370 __flush_addrs(&pernet->local_addr_list);
2371 }
2372}
2373
2374static struct pernet_operations mptcp_pm_pernet_ops = {
2375 .init = pm_nl_init_net,
2376 .exit_batch = pm_nl_exit_net,
2377 .id = &pm_nl_pernet_id,
2378 .size = sizeof(struct pm_nl_pernet),
2379};
2380
2381void __init mptcp_pm_nl_init(void)
2382{
2383 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0)
2384 panic("Failed to register MPTCP PM pernet subsystem.\n");
2385
2386 if (genl_register_family(&mptcp_genl_family))
2387 panic("Failed to register MPTCP PM netlink family\n");
2388}