1 // SPDX-License-Identifier: GPL-2.0
4 * Copyright (c) 2020, Red Hat, Inc.
7 #define pr_fmt(fmt) "MPTCP: " fmt
9 #include <linux/inet.h>
10 #include <linux/kernel.h>
12 #include <net/netns/generic.h>
13 #include <net/mptcp.h>
14 #include <net/genetlink.h>
15 #include <uapi/linux/mptcp.h>
20 /* forward declaration */
21 static struct genl_family mptcp_genl_family;
23 static int pm_nl_pernet_id;
25 struct 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;
34 /* protects pernet updates */
36 struct list_head local_addr_list;
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;
44 DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
47 #define MPTCP_PM_ADDR_MAX 8
48 #define ADD_ADDR_RETRANS_MAX 3
50 static struct pm_nl_pernet *pm_nl_get_pernet(const struct net *net)
52 return net_generic(net, pm_nl_pernet_id);
55 static struct pm_nl_pernet *
56 pm_nl_get_pernet_from_msk(const struct mptcp_sock *msk)
58 return pm_nl_get_pernet(sock_net((struct sock *)msk));
61 bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
62 const struct mptcp_addr_info *b, bool use_port)
64 bool addr_equals = false;
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)
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;
86 return a->port == b->port;
89 static void local_address(const struct sock_common *skc,
90 struct mptcp_addr_info *addr)
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;
102 static void remote_address(const struct sock_common *skc,
103 struct mptcp_addr_info *addr)
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;
115 static bool lookup_subflow_by_saddr(const struct list_head *list,
116 const struct mptcp_addr_info *saddr)
118 struct mptcp_subflow_context *subflow;
119 struct mptcp_addr_info cur;
120 struct sock_common *skc;
122 list_for_each_entry(subflow, list, node) {
123 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
125 local_address(skc, &cur);
126 if (mptcp_addresses_equal(&cur, saddr, saddr->port))
133 static bool lookup_subflow_by_daddr(const struct list_head *list,
134 const struct mptcp_addr_info *daddr)
136 struct mptcp_subflow_context *subflow;
137 struct mptcp_addr_info cur;
138 struct sock_common *skc;
140 list_for_each_entry(subflow, list, node) {
141 skc = (struct sock_common *)mptcp_subflow_tcp_sock(subflow);
143 remote_address(skc, &cur);
144 if (mptcp_addresses_equal(&cur, daddr, daddr->port))
151 static struct mptcp_pm_addr_entry *
152 select_local_address(const struct pm_nl_pernet *pernet,
153 const struct mptcp_sock *msk)
155 const struct sock *sk = (const struct sock *)msk;
156 struct mptcp_pm_addr_entry *entry, *ret = NULL;
158 msk_owned_by_me(msk);
161 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
162 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW))
165 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
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)))
185 static struct mptcp_pm_addr_entry *
186 select_signal_address(struct pm_nl_pernet *pernet, const struct mptcp_sock *msk)
188 struct mptcp_pm_addr_entry *entry, *ret = NULL;
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.
196 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
197 if (!test_bit(entry->addr.id, msk->pm.id_avail_bitmap))
200 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL))
210 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk)
212 const struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
214 return READ_ONCE(pernet->add_addr_signal_max);
216 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_signal_max);
218 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk)
220 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
222 return READ_ONCE(pernet->add_addr_accept_max);
224 EXPORT_SYMBOL_GPL(mptcp_pm_get_add_addr_accept_max);
226 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk)
228 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
230 return READ_ONCE(pernet->subflows_max);
232 EXPORT_SYMBOL_GPL(mptcp_pm_get_subflows_max);
234 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk)
236 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
238 return READ_ONCE(pernet->local_addr_max);
240 EXPORT_SYMBOL_GPL(mptcp_pm_get_local_addr_max);
242 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk)
244 struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk);
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);
255 struct mptcp_pm_add_entry *
256 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
257 const struct mptcp_addr_info *addr)
259 struct mptcp_pm_add_entry *entry;
261 lockdep_assert_held(&msk->pm.lock);
263 list_for_each_entry(entry, &msk->pm.anno_list, list) {
264 if (mptcp_addresses_equal(&entry->addr, addr, true))
271 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk)
273 struct mptcp_pm_add_entry *entry;
274 struct mptcp_addr_info saddr;
277 local_address((struct sock_common *)sk, &saddr);
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)) {
288 spin_unlock_bh(&msk->pm.lock);
292 static void mptcp_pm_add_timer(struct timer_list *timer)
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;
298 pr_debug("msk=%p", msk);
303 if (inet_sk_state_load(sk) == TCP_CLOSE)
309 if (mptcp_pm_should_add_signal_addr(msk)) {
310 sk_reset_timer(sk, timer, jiffies + TCP_RTO_MAX / 8);
314 spin_lock_bh(&msk->pm.lock);
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++;
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)));
327 spin_unlock_bh(&msk->pm.lock);
329 if (entry->retrans_times == ADD_ADDR_RETRANS_MAX)
330 mptcp_pm_subflow_established(msk);
336 struct mptcp_pm_add_entry *
337 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
338 const struct mptcp_addr_info *addr, bool check_id)
340 struct mptcp_pm_add_entry *entry;
341 struct sock *sk = (struct sock *)msk;
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);
349 if (entry && (!check_id || entry->addr.id == addr->id))
350 sk_stop_timer_sync(sk, &entry->add_timer);
355 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
356 const struct mptcp_pm_addr_entry *entry)
358 struct mptcp_pm_add_entry *add_entry = NULL;
359 struct sock *sk = (struct sock *)msk;
360 struct net *net = sock_net(sk);
362 lockdep_assert_held(&msk->pm.lock);
364 add_entry = mptcp_lookup_anno_list_by_saddr(msk, &entry->addr);
367 if (mptcp_pm_is_kernel(msk))
370 sk_reset_timer(sk, &add_entry->add_timer,
371 jiffies + mptcp_get_add_addr_timeout(net));
375 add_entry = kmalloc(sizeof(*add_entry), GFP_ATOMIC);
379 list_add(&add_entry->list, &msk->pm.anno_list);
381 add_entry->addr = entry->addr;
382 add_entry->sock = msk;
383 add_entry->retrans_times = 0;
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));
392 void mptcp_pm_free_anno_list(struct mptcp_sock *msk)
394 struct mptcp_pm_add_entry *entry, *tmp;
395 struct sock *sk = (struct sock *)msk;
396 LIST_HEAD(free_list);
398 pr_debug("msk=%p", msk);
400 spin_lock_bh(&msk->pm.lock);
401 list_splice_init(&msk->pm.anno_list, &free_list);
402 spin_unlock_bh(&msk->pm.lock);
404 list_for_each_entry_safe(entry, tmp, &free_list, list) {
405 sk_stop_timer_sync(sk, &entry->add_timer);
410 static bool lookup_address_in_vec(const struct mptcp_addr_info *addrs, unsigned int nr,
411 const struct mptcp_addr_info *addr)
415 for (i = 0; i < nr; i++) {
416 if (mptcp_addresses_equal(&addrs[i], addr, addr->port))
423 /* Fill all the remote addresses into the array addrs[],
424 * and return the array size.
426 static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk, bool fullmesh,
427 struct mptcp_addr_info *addrs)
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;
436 subflows_max = mptcp_pm_get_subflows_max(msk);
437 remote_address((struct sock_common *)sk, &remote);
439 /* Non-fullmesh endpoint, fill in the single entry
440 * corresponding to the primary MPC subflow remote address
449 mptcp_for_each_subflow(msk, subflow) {
450 ssk = mptcp_subflow_tcp_sock(subflow);
451 remote_address((struct sock_common *)ssk, &addrs[i]);
452 if (deny_id0 && mptcp_addresses_equal(&addrs[i], &remote, false))
455 if (!lookup_address_in_vec(addrs, i, &addrs[i]) &&
456 msk->pm.subflows < subflows_max) {
466 static struct mptcp_pm_addr_entry *
467 __lookup_addr_by_id(struct pm_nl_pernet *pernet, unsigned int id)
469 struct mptcp_pm_addr_entry *entry;
471 list_for_each_entry(entry, &pernet->local_addr_list, list) {
472 if (entry->addr.id == id)
478 static struct mptcp_pm_addr_entry *
479 __lookup_addr(struct pm_nl_pernet *pernet, const struct mptcp_addr_info *info,
482 struct mptcp_pm_addr_entry *entry;
484 list_for_each_entry(entry, &pernet->local_addr_list, list) {
485 if ((!lookup_by_id && mptcp_addresses_equal(&entry->addr, info, true)) ||
486 (lookup_by_id && entry->addr.id == info->id))
493 lookup_id_by_addr(const struct pm_nl_pernet *pernet, const struct mptcp_addr_info *addr)
495 const struct mptcp_pm_addr_entry *entry;
499 list_for_each_entry(entry, &pernet->local_addr_list, list) {
500 if (mptcp_addresses_equal(&entry->addr, addr, entry->addr.port)) {
501 ret = entry->addr.id;
509 static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
511 struct sock *sk = (struct sock *)msk;
512 struct mptcp_pm_addr_entry *local;
513 unsigned int add_addr_signal_max;
514 unsigned int local_addr_max;
515 struct pm_nl_pernet *pernet;
516 unsigned int subflows_max;
518 pernet = pm_nl_get_pernet(sock_net(sk));
520 add_addr_signal_max = mptcp_pm_get_add_addr_signal_max(msk);
521 local_addr_max = mptcp_pm_get_local_addr_max(msk);
522 subflows_max = mptcp_pm_get_subflows_max(msk);
524 /* do lazy endpoint usage accounting for the MPC subflows */
525 if (unlikely(!(msk->pm.status & BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED))) && msk->first) {
526 struct mptcp_addr_info mpc_addr;
529 local_address((struct sock_common *)msk->first, &mpc_addr);
530 mpc_id = lookup_id_by_addr(pernet, &mpc_addr);
532 __clear_bit(mpc_id, msk->pm.id_avail_bitmap);
534 msk->pm.status |= BIT(MPTCP_PM_MPC_ENDPOINT_ACCOUNTED);
537 pr_debug("local %d:%d signal %d:%d subflows %d:%d\n",
538 msk->pm.local_addr_used, local_addr_max,
539 msk->pm.add_addr_signaled, add_addr_signal_max,
540 msk->pm.subflows, subflows_max);
542 /* check first for announce */
543 if (msk->pm.add_addr_signaled < add_addr_signal_max) {
544 local = select_signal_address(pernet, msk);
546 /* due to racing events on both ends we can reach here while
547 * previous add address is still running: if we invoke now
548 * mptcp_pm_announce_addr(), that will fail and the
549 * corresponding id will be marked as used.
550 * Instead let the PM machinery reschedule us when the
551 * current address announce will be completed.
553 if (msk->pm.addr_signal & BIT(MPTCP_ADD_ADDR_SIGNAL))
557 if (mptcp_pm_alloc_anno_list(msk, local)) {
558 __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
559 msk->pm.add_addr_signaled++;
560 mptcp_pm_announce_addr(msk, &local->addr, false);
561 mptcp_pm_nl_addr_send_ack(msk);
566 /* check if should create a new subflow */
567 while (msk->pm.local_addr_used < local_addr_max &&
568 msk->pm.subflows < subflows_max) {
569 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
573 local = select_local_address(pernet, msk);
577 fullmesh = !!(local->flags & MPTCP_PM_ADDR_FLAG_FULLMESH);
579 msk->pm.local_addr_used++;
580 nr = fill_remote_addresses_vec(msk, fullmesh, addrs);
582 __clear_bit(local->addr.id, msk->pm.id_avail_bitmap);
583 spin_unlock_bh(&msk->pm.lock);
584 for (i = 0; i < nr; i++)
585 __mptcp_subflow_connect(sk, &local->addr, &addrs[i]);
586 spin_lock_bh(&msk->pm.lock);
588 mptcp_pm_nl_check_work_pending(msk);
591 static void mptcp_pm_nl_fully_established(struct mptcp_sock *msk)
593 mptcp_pm_create_subflow_or_signal_addr(msk);
596 static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk)
598 mptcp_pm_create_subflow_or_signal_addr(msk);
601 /* Fill all the local addresses into the array addrs[],
602 * and return the array size.
604 static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk,
605 struct mptcp_addr_info *addrs)
607 struct sock *sk = (struct sock *)msk;
608 struct mptcp_pm_addr_entry *entry;
609 struct mptcp_addr_info local;
610 struct pm_nl_pernet *pernet;
611 unsigned int subflows_max;
614 pernet = pm_nl_get_pernet_from_msk(msk);
615 subflows_max = mptcp_pm_get_subflows_max(msk);
618 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
619 if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH))
622 if (entry->addr.family != sk->sk_family) {
623 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
624 if ((entry->addr.family == AF_INET &&
625 !ipv6_addr_v4mapped(&sk->sk_v6_daddr)) ||
626 (sk->sk_family == AF_INET &&
627 !ipv6_addr_v4mapped(&entry->addr.addr6)))
632 if (msk->pm.subflows < subflows_max) {
634 addrs[i++] = entry->addr;
639 /* If the array is empty, fill in the single
640 * 'IPADDRANY' local address
643 memset(&local, 0, sizeof(local));
644 local.family = msk->pm.remote.family;
653 static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk)
655 struct mptcp_addr_info addrs[MPTCP_PM_ADDR_MAX];
656 struct sock *sk = (struct sock *)msk;
657 unsigned int add_addr_accept_max;
658 struct mptcp_addr_info remote;
659 unsigned int subflows_max;
662 add_addr_accept_max = mptcp_pm_get_add_addr_accept_max(msk);
663 subflows_max = mptcp_pm_get_subflows_max(msk);
665 pr_debug("accepted %d:%d remote family %d",
666 msk->pm.add_addr_accepted, add_addr_accept_max,
667 msk->pm.remote.family);
669 remote = msk->pm.remote;
670 mptcp_pm_announce_addr(msk, &remote, true);
671 mptcp_pm_nl_addr_send_ack(msk);
673 if (lookup_subflow_by_daddr(&msk->conn_list, &remote))
676 /* pick id 0 port, if none is provided the remote address */
678 remote.port = sk->sk_dport;
680 /* connect to the specified remote address, using whatever
681 * local address the routing configuration will pick.
683 nr = fill_local_addresses_vec(msk, addrs);
685 msk->pm.add_addr_accepted++;
686 if (msk->pm.add_addr_accepted >= add_addr_accept_max ||
687 msk->pm.subflows >= subflows_max)
688 WRITE_ONCE(msk->pm.accept_addr, false);
690 spin_unlock_bh(&msk->pm.lock);
691 for (i = 0; i < nr; i++)
692 __mptcp_subflow_connect(sk, &addrs[i], &remote);
693 spin_lock_bh(&msk->pm.lock);
696 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk)
698 struct mptcp_subflow_context *subflow;
700 msk_owned_by_me(msk);
701 lockdep_assert_held(&msk->pm.lock);
703 if (!mptcp_pm_should_add_signal(msk) &&
704 !mptcp_pm_should_rm_signal(msk))
707 subflow = list_first_entry_or_null(&msk->conn_list, typeof(*subflow), node);
709 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
711 spin_unlock_bh(&msk->pm.lock);
712 pr_debug("send ack for %s",
713 mptcp_pm_should_add_signal(msk) ? "add_addr" : "rm_addr");
715 mptcp_subflow_send_ack(ssk);
716 spin_lock_bh(&msk->pm.lock);
720 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
721 struct mptcp_addr_info *addr,
722 struct mptcp_addr_info *rem,
725 struct mptcp_subflow_context *subflow;
727 pr_debug("bkup=%d", bkup);
729 mptcp_for_each_subflow(msk, subflow) {
730 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
731 struct mptcp_addr_info local, remote;
734 local_address((struct sock_common *)ssk, &local);
735 if (!mptcp_addresses_equal(&local, addr, addr->port))
738 if (rem && rem->family != AF_UNSPEC) {
739 remote_address((struct sock_common *)ssk, &remote);
740 if (!mptcp_addresses_equal(&remote, rem, rem->port))
744 slow = lock_sock_fast(ssk);
745 if (subflow->backup != bkup)
746 msk->last_snd = NULL;
747 subflow->backup = bkup;
748 subflow->send_mp_prio = 1;
749 subflow->request_bkup = bkup;
751 pr_debug("send ack for mp_prio");
752 __mptcp_subflow_send_ack(ssk);
753 unlock_sock_fast(ssk, slow);
761 static void mptcp_pm_nl_rm_addr_or_subflow(struct mptcp_sock *msk,
762 const struct mptcp_rm_list *rm_list,
763 enum linux_mptcp_mib_field rm_type)
765 struct mptcp_subflow_context *subflow, *tmp;
766 struct sock *sk = (struct sock *)msk;
769 pr_debug("%s rm_list_nr %d",
770 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow", rm_list->nr);
772 msk_owned_by_me(msk);
774 if (sk->sk_state == TCP_LISTEN)
780 if (list_empty(&msk->conn_list))
783 for (i = 0; i < rm_list->nr; i++) {
784 bool removed = false;
786 list_for_each_entry_safe(subflow, tmp, &msk->conn_list, node) {
787 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
788 int how = RCV_SHUTDOWN | SEND_SHUTDOWN;
789 u8 id = subflow->local_id;
791 if (rm_type == MPTCP_MIB_RMADDR)
792 id = subflow->remote_id;
794 if (rm_list->ids[i] != id)
797 pr_debug(" -> %s rm_list_ids[%d]=%u local_id=%u remote_id=%u",
798 rm_type == MPTCP_MIB_RMADDR ? "address" : "subflow",
799 i, rm_list->ids[i], subflow->local_id, subflow->remote_id);
800 spin_unlock_bh(&msk->pm.lock);
801 mptcp_subflow_shutdown(sk, ssk, how);
803 /* the following takes care of updating the subflows counter */
804 mptcp_close_ssk(sk, ssk, subflow);
805 spin_lock_bh(&msk->pm.lock);
808 __MPTCP_INC_STATS(sock_net(sk), rm_type);
810 if (rm_type == MPTCP_MIB_RMSUBFLOW)
811 __set_bit(rm_list->ids[i], msk->pm.id_avail_bitmap);
815 if (!mptcp_pm_is_kernel(msk))
818 if (rm_type == MPTCP_MIB_RMADDR) {
819 msk->pm.add_addr_accepted--;
820 WRITE_ONCE(msk->pm.accept_addr, true);
821 } else if (rm_type == MPTCP_MIB_RMSUBFLOW) {
822 msk->pm.local_addr_used--;
827 static void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk)
829 mptcp_pm_nl_rm_addr_or_subflow(msk, &msk->pm.rm_list_rx, MPTCP_MIB_RMADDR);
832 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
833 const struct mptcp_rm_list *rm_list)
835 mptcp_pm_nl_rm_addr_or_subflow(msk, rm_list, MPTCP_MIB_RMSUBFLOW);
838 void mptcp_pm_nl_work(struct mptcp_sock *msk)
840 struct mptcp_pm_data *pm = &msk->pm;
842 msk_owned_by_me(msk);
844 if (!(pm->status & MPTCP_PM_WORK_MASK))
847 spin_lock_bh(&msk->pm.lock);
849 pr_debug("msk=%p status=%x", msk, pm->status);
850 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_RECEIVED)) {
851 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_RECEIVED);
852 mptcp_pm_nl_add_addr_received(msk);
854 if (pm->status & BIT(MPTCP_PM_ADD_ADDR_SEND_ACK)) {
855 pm->status &= ~BIT(MPTCP_PM_ADD_ADDR_SEND_ACK);
856 mptcp_pm_nl_addr_send_ack(msk);
858 if (pm->status & BIT(MPTCP_PM_RM_ADDR_RECEIVED)) {
859 pm->status &= ~BIT(MPTCP_PM_RM_ADDR_RECEIVED);
860 mptcp_pm_nl_rm_addr_received(msk);
862 if (pm->status & BIT(MPTCP_PM_ESTABLISHED)) {
863 pm->status &= ~BIT(MPTCP_PM_ESTABLISHED);
864 mptcp_pm_nl_fully_established(msk);
866 if (pm->status & BIT(MPTCP_PM_SUBFLOW_ESTABLISHED)) {
867 pm->status &= ~BIT(MPTCP_PM_SUBFLOW_ESTABLISHED);
868 mptcp_pm_nl_subflow_established(msk);
871 spin_unlock_bh(&msk->pm.lock);
874 static bool address_use_port(struct mptcp_pm_addr_entry *entry)
876 return (entry->flags &
877 (MPTCP_PM_ADDR_FLAG_SIGNAL | MPTCP_PM_ADDR_FLAG_SUBFLOW)) ==
878 MPTCP_PM_ADDR_FLAG_SIGNAL;
881 /* caller must ensure the RCU grace period is already elapsed */
882 static void __mptcp_pm_release_addr_entry(struct mptcp_pm_addr_entry *entry)
885 sock_release(entry->lsk);
889 static int mptcp_pm_nl_append_new_local_addr(struct pm_nl_pernet *pernet,
890 struct mptcp_pm_addr_entry *entry)
892 struct mptcp_pm_addr_entry *cur, *del_entry = NULL;
893 unsigned int addr_max;
896 spin_lock_bh(&pernet->lock);
897 /* to keep the code simple, don't do IDR-like allocation for address ID,
898 * just bail when we exceed limits
900 if (pernet->next_id == MPTCP_PM_MAX_ADDR_ID)
902 if (pernet->addrs >= MPTCP_PM_ADDR_MAX)
904 if (test_bit(entry->addr.id, pernet->id_bitmap))
907 /* do not insert duplicate address, differentiate on port only
910 list_for_each_entry(cur, &pernet->local_addr_list, list) {
911 if (mptcp_addresses_equal(&cur->addr, &entry->addr,
912 address_use_port(entry) &&
913 address_use_port(cur))) {
914 /* allow replacing the exiting endpoint only if such
915 * endpoint is an implicit one and the user-space
916 * did not provide an endpoint id
918 if (!(cur->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT))
924 entry->addr.id = cur->addr.id;
925 list_del_rcu(&cur->list);
931 if (!entry->addr.id) {
933 entry->addr.id = find_next_zero_bit(pernet->id_bitmap,
934 MPTCP_PM_MAX_ADDR_ID + 1,
936 if (!entry->addr.id && pernet->next_id != 1) {
945 __set_bit(entry->addr.id, pernet->id_bitmap);
946 if (entry->addr.id > pernet->next_id)
947 pernet->next_id = entry->addr.id;
949 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
950 addr_max = pernet->add_addr_signal_max;
951 WRITE_ONCE(pernet->add_addr_signal_max, addr_max + 1);
953 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
954 addr_max = pernet->local_addr_max;
955 WRITE_ONCE(pernet->local_addr_max, addr_max + 1);
959 list_add_tail_rcu(&entry->list, &pernet->local_addr_list);
960 ret = entry->addr.id;
963 spin_unlock_bh(&pernet->lock);
965 /* just replaced an existing entry, free it */
968 __mptcp_pm_release_addr_entry(del_entry);
973 static int mptcp_pm_nl_create_listen_socket(struct sock *sk,
974 struct mptcp_pm_addr_entry *entry)
976 int addrlen = sizeof(struct sockaddr_in);
977 struct sockaddr_storage addr;
978 struct mptcp_sock *msk;
979 struct socket *ssock;
983 err = sock_create_kern(sock_net(sk), entry->addr.family,
984 SOCK_STREAM, IPPROTO_MPTCP, &entry->lsk);
988 msk = mptcp_sk(entry->lsk->sk);
994 ssock = __mptcp_nmpc_socket(msk);
1000 mptcp_info2sockaddr(&entry->addr, &addr, entry->addr.family);
1001 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1002 if (entry->addr.family == AF_INET6)
1003 addrlen = sizeof(struct sockaddr_in6);
1005 err = kernel_bind(ssock, (struct sockaddr *)&addr, addrlen);
1007 pr_warn("kernel_bind error, err=%d", err);
1011 err = kernel_listen(ssock, backlog);
1013 pr_warn("kernel_listen error, err=%d", err);
1020 sock_release(entry->lsk);
1024 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc)
1026 struct mptcp_pm_addr_entry *entry;
1027 struct mptcp_addr_info skc_local;
1028 struct mptcp_addr_info msk_local;
1029 struct pm_nl_pernet *pernet;
1032 if (WARN_ON_ONCE(!msk))
1035 /* The 0 ID mapping is defined by the first subflow, copied into the msk
1038 local_address((struct sock_common *)msk, &msk_local);
1039 local_address((struct sock_common *)skc, &skc_local);
1040 if (mptcp_addresses_equal(&msk_local, &skc_local, false))
1043 if (mptcp_pm_is_userspace(msk))
1044 return mptcp_userspace_pm_get_local_id(msk, &skc_local);
1046 pernet = pm_nl_get_pernet_from_msk(msk);
1049 list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) {
1050 if (mptcp_addresses_equal(&entry->addr, &skc_local, entry->addr.port)) {
1051 ret = entry->addr.id;
1059 /* address not found, add to local list */
1060 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
1064 entry->addr = skc_local;
1066 entry->addr.port = 0;
1068 entry->flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
1070 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
1077 #define MPTCP_PM_CMD_GRP_OFFSET 0
1078 #define MPTCP_PM_EV_GRP_OFFSET 1
1080 static const struct genl_multicast_group mptcp_pm_mcgrps[] = {
1081 [MPTCP_PM_CMD_GRP_OFFSET] = { .name = MPTCP_PM_CMD_GRP_NAME, },
1082 [MPTCP_PM_EV_GRP_OFFSET] = { .name = MPTCP_PM_EV_GRP_NAME,
1083 .flags = GENL_UNS_ADMIN_PERM,
1087 static const struct nla_policy
1088 mptcp_pm_addr_policy[MPTCP_PM_ADDR_ATTR_MAX + 1] = {
1089 [MPTCP_PM_ADDR_ATTR_FAMILY] = { .type = NLA_U16, },
1090 [MPTCP_PM_ADDR_ATTR_ID] = { .type = NLA_U8, },
1091 [MPTCP_PM_ADDR_ATTR_ADDR4] = { .type = NLA_U32, },
1092 [MPTCP_PM_ADDR_ATTR_ADDR6] =
1093 NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
1094 [MPTCP_PM_ADDR_ATTR_PORT] = { .type = NLA_U16 },
1095 [MPTCP_PM_ADDR_ATTR_FLAGS] = { .type = NLA_U32 },
1096 [MPTCP_PM_ADDR_ATTR_IF_IDX] = { .type = NLA_S32 },
1099 static const struct nla_policy mptcp_pm_policy[MPTCP_PM_ATTR_MAX + 1] = {
1100 [MPTCP_PM_ATTR_ADDR] =
1101 NLA_POLICY_NESTED(mptcp_pm_addr_policy),
1102 [MPTCP_PM_ATTR_RCV_ADD_ADDRS] = { .type = NLA_U32, },
1103 [MPTCP_PM_ATTR_SUBFLOWS] = { .type = NLA_U32, },
1104 [MPTCP_PM_ATTR_TOKEN] = { .type = NLA_U32, },
1105 [MPTCP_PM_ATTR_LOC_ID] = { .type = NLA_U8, },
1106 [MPTCP_PM_ATTR_ADDR_REMOTE] =
1107 NLA_POLICY_NESTED(mptcp_pm_addr_policy),
1110 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk)
1112 struct mptcp_subflow_context *iter, *subflow = mptcp_subflow_ctx(ssk);
1113 struct sock *sk = (struct sock *)msk;
1114 unsigned int active_max_loss_cnt;
1115 struct net *net = sock_net(sk);
1116 unsigned int stale_loss_cnt;
1119 stale_loss_cnt = mptcp_stale_loss_cnt(net);
1120 if (subflow->stale || !stale_loss_cnt || subflow->stale_count <= stale_loss_cnt)
1123 /* look for another available subflow not in loss state */
1124 active_max_loss_cnt = max_t(int, stale_loss_cnt - 1, 1);
1125 mptcp_for_each_subflow(msk, iter) {
1126 if (iter != subflow && mptcp_subflow_active(iter) &&
1127 iter->stale_count < active_max_loss_cnt) {
1128 /* we have some alternatives, try to mark this subflow as idle ...*/
1129 slow = lock_sock_fast(ssk);
1130 if (!tcp_rtx_and_write_queues_empty(ssk)) {
1132 __mptcp_retransmit_pending_data(sk);
1133 MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_SUBFLOWSTALE);
1135 unlock_sock_fast(ssk, slow);
1137 /* always try to push the pending data regarless of re-injections:
1138 * we can possibly use backup subflows now, and subflow selection
1139 * is cheap under the msk socket lock
1141 __mptcp_push_pending(sk, 0);
1147 static int mptcp_pm_family_to_addr(int family)
1149 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1150 if (family == AF_INET6)
1151 return MPTCP_PM_ADDR_ATTR_ADDR6;
1153 return MPTCP_PM_ADDR_ATTR_ADDR4;
1156 static int mptcp_pm_parse_pm_addr_attr(struct nlattr *tb[],
1157 const struct nlattr *attr,
1158 struct genl_info *info,
1159 struct mptcp_addr_info *addr,
1160 bool require_family)
1165 GENL_SET_ERR_MSG(info, "missing address info");
1169 /* no validation needed - was already done via nested policy */
1170 err = nla_parse_nested_deprecated(tb, MPTCP_PM_ADDR_ATTR_MAX, attr,
1171 mptcp_pm_addr_policy, info->extack);
1175 if (tb[MPTCP_PM_ADDR_ATTR_ID])
1176 addr->id = nla_get_u8(tb[MPTCP_PM_ADDR_ATTR_ID]);
1178 if (!tb[MPTCP_PM_ADDR_ATTR_FAMILY]) {
1179 if (!require_family)
1182 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1187 addr->family = nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_FAMILY]);
1188 if (addr->family != AF_INET
1189 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1190 && addr->family != AF_INET6
1193 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1194 "unknown address family");
1197 addr_addr = mptcp_pm_family_to_addr(addr->family);
1198 if (!tb[addr_addr]) {
1199 NL_SET_ERR_MSG_ATTR(info->extack, attr,
1200 "missing address data");
1204 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1205 if (addr->family == AF_INET6)
1206 addr->addr6 = nla_get_in6_addr(tb[addr_addr]);
1209 addr->addr.s_addr = nla_get_in_addr(tb[addr_addr]);
1211 if (tb[MPTCP_PM_ADDR_ATTR_PORT])
1212 addr->port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
1217 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
1218 struct mptcp_addr_info *addr)
1220 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
1222 memset(addr, 0, sizeof(*addr));
1224 return mptcp_pm_parse_pm_addr_attr(tb, attr, info, addr, true);
1227 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
1228 bool require_family,
1229 struct mptcp_pm_addr_entry *entry)
1231 struct nlattr *tb[MPTCP_PM_ADDR_ATTR_MAX + 1];
1234 memset(entry, 0, sizeof(*entry));
1236 err = mptcp_pm_parse_pm_addr_attr(tb, attr, info, &entry->addr, require_family);
1240 if (tb[MPTCP_PM_ADDR_ATTR_IF_IDX]) {
1241 u32 val = nla_get_s32(tb[MPTCP_PM_ADDR_ATTR_IF_IDX]);
1243 entry->ifindex = val;
1246 if (tb[MPTCP_PM_ADDR_ATTR_FLAGS])
1247 entry->flags = nla_get_u32(tb[MPTCP_PM_ADDR_ATTR_FLAGS]);
1249 if (tb[MPTCP_PM_ADDR_ATTR_PORT])
1250 entry->addr.port = htons(nla_get_u16(tb[MPTCP_PM_ADDR_ATTR_PORT]));
1255 static struct pm_nl_pernet *genl_info_pm_nl(struct genl_info *info)
1257 return pm_nl_get_pernet(genl_info_net(info));
1260 static int mptcp_nl_add_subflow_or_signal_addr(struct net *net)
1262 struct mptcp_sock *msk;
1263 long s_slot = 0, s_num = 0;
1265 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1266 struct sock *sk = (struct sock *)msk;
1268 if (!READ_ONCE(msk->fully_established) ||
1269 mptcp_pm_is_userspace(msk))
1273 spin_lock_bh(&msk->pm.lock);
1274 mptcp_pm_create_subflow_or_signal_addr(msk);
1275 spin_unlock_bh(&msk->pm.lock);
1286 static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
1288 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1289 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1290 struct mptcp_pm_addr_entry addr, *entry;
1293 ret = mptcp_pm_parse_entry(attr, info, true, &addr);
1297 if (addr.addr.port && !(addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
1298 GENL_SET_ERR_MSG(info, "flags must have signal when using port");
1302 if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL &&
1303 addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) {
1304 GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh");
1308 if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) {
1309 GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint");
1313 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
1315 GENL_SET_ERR_MSG(info, "can't allocate addr");
1320 if (entry->addr.port) {
1321 ret = mptcp_pm_nl_create_listen_socket(skb->sk, entry);
1323 GENL_SET_ERR_MSG(info, "create listen socket error");
1328 ret = mptcp_pm_nl_append_new_local_addr(pernet, entry);
1330 GENL_SET_ERR_MSG(info, "too many addresses or duplicate one");
1332 sock_release(entry->lsk);
1337 mptcp_nl_add_subflow_or_signal_addr(sock_net(skb->sk));
1342 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk, unsigned int id,
1343 u8 *flags, int *ifindex)
1345 struct mptcp_pm_addr_entry *entry;
1346 struct sock *sk = (struct sock *)msk;
1347 struct net *net = sock_net(sk);
1353 if (mptcp_pm_is_userspace(msk))
1354 return mptcp_userspace_pm_get_flags_and_ifindex_by_id(msk,
1360 entry = __lookup_addr_by_id(pm_nl_get_pernet(net), id);
1362 *flags = entry->flags;
1363 *ifindex = entry->ifindex;
1371 static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
1372 const struct mptcp_addr_info *addr)
1374 struct mptcp_pm_add_entry *entry;
1376 entry = mptcp_pm_del_add_timer(msk, addr, false);
1378 list_del(&entry->list);
1386 static bool mptcp_pm_remove_anno_addr(struct mptcp_sock *msk,
1387 const struct mptcp_addr_info *addr,
1390 struct mptcp_rm_list list = { .nr = 0 };
1393 list.ids[list.nr++] = addr->id;
1395 ret = remove_anno_list_by_saddr(msk, addr);
1397 spin_lock_bh(&msk->pm.lock);
1398 mptcp_pm_remove_addr(msk, &list);
1399 spin_unlock_bh(&msk->pm.lock);
1404 static int mptcp_nl_remove_subflow_and_signal_addr(struct net *net,
1405 const struct mptcp_pm_addr_entry *entry)
1407 const struct mptcp_addr_info *addr = &entry->addr;
1408 struct mptcp_rm_list list = { .nr = 0 };
1409 long s_slot = 0, s_num = 0;
1410 struct mptcp_sock *msk;
1412 pr_debug("remove_id=%d", addr->id);
1414 list.ids[list.nr++] = addr->id;
1416 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1417 struct sock *sk = (struct sock *)msk;
1418 bool remove_subflow;
1420 if (mptcp_pm_is_userspace(msk))
1423 if (list_empty(&msk->conn_list)) {
1424 mptcp_pm_remove_anno_addr(msk, addr, false);
1429 remove_subflow = lookup_subflow_by_saddr(&msk->conn_list, addr);
1430 mptcp_pm_remove_anno_addr(msk, addr, remove_subflow &&
1431 !(entry->flags & MPTCP_PM_ADDR_FLAG_IMPLICIT));
1433 mptcp_pm_remove_subflow(msk, &list);
1444 static int mptcp_nl_remove_id_zero_address(struct net *net,
1445 struct mptcp_addr_info *addr)
1447 struct mptcp_rm_list list = { .nr = 0 };
1448 long s_slot = 0, s_num = 0;
1449 struct mptcp_sock *msk;
1451 list.ids[list.nr++] = 0;
1453 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1454 struct sock *sk = (struct sock *)msk;
1455 struct mptcp_addr_info msk_local;
1457 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
1460 local_address((struct sock_common *)msk, &msk_local);
1461 if (!mptcp_addresses_equal(&msk_local, addr, addr->port))
1465 spin_lock_bh(&msk->pm.lock);
1466 mptcp_pm_remove_addr(msk, &list);
1467 mptcp_pm_nl_rm_subflow_received(msk, &list);
1468 spin_unlock_bh(&msk->pm.lock);
1479 static int mptcp_nl_cmd_del_addr(struct sk_buff *skb, struct genl_info *info)
1481 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1482 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1483 struct mptcp_pm_addr_entry addr, *entry;
1484 unsigned int addr_max;
1487 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1491 /* the zero id address is special: the first address used by the msk
1492 * always gets such an id, so different subflows can have different zero
1493 * id addresses. Additionally zero id is not accounted for in id_bitmap.
1494 * Let's use an 'mptcp_rm_list' instead of the common remove code.
1496 if (addr.addr.id == 0)
1497 return mptcp_nl_remove_id_zero_address(sock_net(skb->sk), &addr.addr);
1499 spin_lock_bh(&pernet->lock);
1500 entry = __lookup_addr_by_id(pernet, addr.addr.id);
1502 GENL_SET_ERR_MSG(info, "address not found");
1503 spin_unlock_bh(&pernet->lock);
1506 if (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL) {
1507 addr_max = pernet->add_addr_signal_max;
1508 WRITE_ONCE(pernet->add_addr_signal_max, addr_max - 1);
1510 if (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW) {
1511 addr_max = pernet->local_addr_max;
1512 WRITE_ONCE(pernet->local_addr_max, addr_max - 1);
1516 list_del_rcu(&entry->list);
1517 __clear_bit(entry->addr.id, pernet->id_bitmap);
1518 spin_unlock_bh(&pernet->lock);
1520 mptcp_nl_remove_subflow_and_signal_addr(sock_net(skb->sk), entry);
1522 __mptcp_pm_release_addr_entry(entry);
1527 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
1528 struct list_head *rm_list)
1530 struct mptcp_rm_list alist = { .nr = 0 }, slist = { .nr = 0 };
1531 struct mptcp_pm_addr_entry *entry;
1533 list_for_each_entry(entry, rm_list, list) {
1534 if (lookup_subflow_by_saddr(&msk->conn_list, &entry->addr) &&
1535 slist.nr < MPTCP_RM_IDS_MAX)
1536 slist.ids[slist.nr++] = entry->addr.id;
1538 if (remove_anno_list_by_saddr(msk, &entry->addr) &&
1539 alist.nr < MPTCP_RM_IDS_MAX)
1540 alist.ids[alist.nr++] = entry->addr.id;
1544 spin_lock_bh(&msk->pm.lock);
1545 mptcp_pm_remove_addr(msk, &alist);
1546 spin_unlock_bh(&msk->pm.lock);
1549 mptcp_pm_remove_subflow(msk, &slist);
1552 static void mptcp_nl_remove_addrs_list(struct net *net,
1553 struct list_head *rm_list)
1555 long s_slot = 0, s_num = 0;
1556 struct mptcp_sock *msk;
1558 if (list_empty(rm_list))
1561 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1562 struct sock *sk = (struct sock *)msk;
1564 if (!mptcp_pm_is_userspace(msk)) {
1566 mptcp_pm_remove_addrs_and_subflows(msk, rm_list);
1575 /* caller must ensure the RCU grace period is already elapsed */
1576 static void __flush_addrs(struct list_head *list)
1578 while (!list_empty(list)) {
1579 struct mptcp_pm_addr_entry *cur;
1581 cur = list_entry(list->next,
1582 struct mptcp_pm_addr_entry, list);
1583 list_del_rcu(&cur->list);
1584 __mptcp_pm_release_addr_entry(cur);
1588 static void __reset_counters(struct pm_nl_pernet *pernet)
1590 WRITE_ONCE(pernet->add_addr_signal_max, 0);
1591 WRITE_ONCE(pernet->add_addr_accept_max, 0);
1592 WRITE_ONCE(pernet->local_addr_max, 0);
1596 static int mptcp_nl_cmd_flush_addrs(struct sk_buff *skb, struct genl_info *info)
1598 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1599 LIST_HEAD(free_list);
1601 spin_lock_bh(&pernet->lock);
1602 list_splice_init(&pernet->local_addr_list, &free_list);
1603 __reset_counters(pernet);
1604 pernet->next_id = 1;
1605 bitmap_zero(pernet->id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
1606 spin_unlock_bh(&pernet->lock);
1607 mptcp_nl_remove_addrs_list(sock_net(skb->sk), &free_list);
1609 __flush_addrs(&free_list);
1613 static int mptcp_nl_fill_addr(struct sk_buff *skb,
1614 struct mptcp_pm_addr_entry *entry)
1616 struct mptcp_addr_info *addr = &entry->addr;
1617 struct nlattr *attr;
1619 attr = nla_nest_start(skb, MPTCP_PM_ATTR_ADDR);
1623 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_FAMILY, addr->family))
1624 goto nla_put_failure;
1625 if (nla_put_u16(skb, MPTCP_PM_ADDR_ATTR_PORT, ntohs(addr->port)))
1626 goto nla_put_failure;
1627 if (nla_put_u8(skb, MPTCP_PM_ADDR_ATTR_ID, addr->id))
1628 goto nla_put_failure;
1629 if (nla_put_u32(skb, MPTCP_PM_ADDR_ATTR_FLAGS, entry->flags))
1630 goto nla_put_failure;
1631 if (entry->ifindex &&
1632 nla_put_s32(skb, MPTCP_PM_ADDR_ATTR_IF_IDX, entry->ifindex))
1633 goto nla_put_failure;
1635 if (addr->family == AF_INET &&
1636 nla_put_in_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR4,
1638 goto nla_put_failure;
1639 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1640 else if (addr->family == AF_INET6 &&
1641 nla_put_in6_addr(skb, MPTCP_PM_ADDR_ATTR_ADDR6, &addr->addr6))
1642 goto nla_put_failure;
1644 nla_nest_end(skb, attr);
1648 nla_nest_cancel(skb, attr);
1652 static int mptcp_nl_cmd_get_addr(struct sk_buff *skb, struct genl_info *info)
1654 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1655 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1656 struct mptcp_pm_addr_entry addr, *entry;
1657 struct sk_buff *msg;
1661 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1665 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1669 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
1670 info->genlhdr->cmd);
1672 GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
1677 spin_lock_bh(&pernet->lock);
1678 entry = __lookup_addr_by_id(pernet, addr.addr.id);
1680 GENL_SET_ERR_MSG(info, "address not found");
1685 ret = mptcp_nl_fill_addr(msg, entry);
1689 genlmsg_end(msg, reply);
1690 ret = genlmsg_reply(msg, info);
1691 spin_unlock_bh(&pernet->lock);
1695 spin_unlock_bh(&pernet->lock);
1702 static int mptcp_nl_cmd_dump_addrs(struct sk_buff *msg,
1703 struct netlink_callback *cb)
1705 struct net *net = sock_net(msg->sk);
1706 struct mptcp_pm_addr_entry *entry;
1707 struct pm_nl_pernet *pernet;
1708 int id = cb->args[0];
1712 pernet = pm_nl_get_pernet(net);
1714 spin_lock_bh(&pernet->lock);
1715 for (i = id; i < MPTCP_PM_MAX_ADDR_ID + 1; i++) {
1716 if (test_bit(i, pernet->id_bitmap)) {
1717 entry = __lookup_addr_by_id(pernet, i);
1721 if (entry->addr.id <= id)
1724 hdr = genlmsg_put(msg, NETLINK_CB(cb->skb).portid,
1725 cb->nlh->nlmsg_seq, &mptcp_genl_family,
1726 NLM_F_MULTI, MPTCP_PM_CMD_GET_ADDR);
1730 if (mptcp_nl_fill_addr(msg, entry) < 0) {
1731 genlmsg_cancel(msg, hdr);
1735 id = entry->addr.id;
1736 genlmsg_end(msg, hdr);
1739 spin_unlock_bh(&pernet->lock);
1745 static int parse_limit(struct genl_info *info, int id, unsigned int *limit)
1747 struct nlattr *attr = info->attrs[id];
1752 *limit = nla_get_u32(attr);
1753 if (*limit > MPTCP_PM_ADDR_MAX) {
1754 GENL_SET_ERR_MSG(info, "limit greater than maximum");
1761 mptcp_nl_cmd_set_limits(struct sk_buff *skb, struct genl_info *info)
1763 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1764 unsigned int rcv_addrs, subflows;
1767 spin_lock_bh(&pernet->lock);
1768 rcv_addrs = pernet->add_addr_accept_max;
1769 ret = parse_limit(info, MPTCP_PM_ATTR_RCV_ADD_ADDRS, &rcv_addrs);
1773 subflows = pernet->subflows_max;
1774 ret = parse_limit(info, MPTCP_PM_ATTR_SUBFLOWS, &subflows);
1778 WRITE_ONCE(pernet->add_addr_accept_max, rcv_addrs);
1779 WRITE_ONCE(pernet->subflows_max, subflows);
1782 spin_unlock_bh(&pernet->lock);
1787 mptcp_nl_cmd_get_limits(struct sk_buff *skb, struct genl_info *info)
1789 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1790 struct sk_buff *msg;
1793 msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1797 reply = genlmsg_put_reply(msg, info, &mptcp_genl_family, 0,
1798 MPTCP_PM_CMD_GET_LIMITS);
1802 if (nla_put_u32(msg, MPTCP_PM_ATTR_RCV_ADD_ADDRS,
1803 READ_ONCE(pernet->add_addr_accept_max)))
1806 if (nla_put_u32(msg, MPTCP_PM_ATTR_SUBFLOWS,
1807 READ_ONCE(pernet->subflows_max)))
1810 genlmsg_end(msg, reply);
1811 return genlmsg_reply(msg, info);
1814 GENL_SET_ERR_MSG(info, "not enough space in Netlink message");
1819 static void mptcp_pm_nl_fullmesh(struct mptcp_sock *msk,
1820 struct mptcp_addr_info *addr)
1822 struct mptcp_rm_list list = { .nr = 0 };
1824 list.ids[list.nr++] = addr->id;
1826 spin_lock_bh(&msk->pm.lock);
1827 mptcp_pm_nl_rm_subflow_received(msk, &list);
1828 mptcp_pm_create_subflow_or_signal_addr(msk);
1829 spin_unlock_bh(&msk->pm.lock);
1832 static int mptcp_nl_set_flags(struct net *net,
1833 struct mptcp_addr_info *addr,
1834 u8 bkup, u8 changed)
1836 long s_slot = 0, s_num = 0;
1837 struct mptcp_sock *msk;
1840 while ((msk = mptcp_token_iter_next(net, &s_slot, &s_num)) != NULL) {
1841 struct sock *sk = (struct sock *)msk;
1843 if (list_empty(&msk->conn_list) || mptcp_pm_is_userspace(msk))
1847 if (changed & MPTCP_PM_ADDR_FLAG_BACKUP)
1848 ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup);
1849 if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH)
1850 mptcp_pm_nl_fullmesh(msk, addr);
1861 static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
1863 struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
1864 struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, };
1865 struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
1866 struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
1867 struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
1868 struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
1869 u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
1870 MPTCP_PM_ADDR_FLAG_FULLMESH;
1871 struct net *net = sock_net(skb->sk);
1872 u8 bkup = 0, lookup_by_id = 0;
1875 ret = mptcp_pm_parse_entry(attr, info, false, &addr);
1880 ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote);
1885 if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
1887 if (addr.addr.family == AF_UNSPEC) {
1894 return mptcp_userspace_pm_set_flags(sock_net(skb->sk),
1895 token, &addr, &remote, bkup);
1897 spin_lock_bh(&pernet->lock);
1898 entry = __lookup_addr(pernet, &addr.addr, lookup_by_id);
1900 spin_unlock_bh(&pernet->lock);
1903 if ((addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) &&
1904 (entry->flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
1905 spin_unlock_bh(&pernet->lock);
1909 changed = (addr.flags ^ entry->flags) & mask;
1910 entry->flags = (entry->flags & ~mask) | (addr.flags & mask);
1912 spin_unlock_bh(&pernet->lock);
1914 mptcp_nl_set_flags(net, &addr.addr, bkup, changed);
1918 static void mptcp_nl_mcast_send(struct net *net, struct sk_buff *nlskb, gfp_t gfp)
1920 genlmsg_multicast_netns(&mptcp_genl_family, net,
1921 nlskb, 0, MPTCP_PM_EV_GRP_OFFSET, gfp);
1924 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk)
1926 return genl_has_listeners(&mptcp_genl_family,
1927 sock_net((const struct sock *)msk),
1928 MPTCP_PM_EV_GRP_OFFSET);
1931 static int mptcp_event_add_subflow(struct sk_buff *skb, const struct sock *ssk)
1933 const struct inet_sock *issk = inet_sk(ssk);
1934 const struct mptcp_subflow_context *sf;
1936 if (nla_put_u16(skb, MPTCP_ATTR_FAMILY, ssk->sk_family))
1939 switch (ssk->sk_family) {
1941 if (nla_put_in_addr(skb, MPTCP_ATTR_SADDR4, issk->inet_saddr))
1943 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, issk->inet_daddr))
1946 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
1948 const struct ipv6_pinfo *np = inet6_sk(ssk);
1950 if (nla_put_in6_addr(skb, MPTCP_ATTR_SADDR6, &np->saddr))
1952 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &ssk->sk_v6_daddr))
1962 if (nla_put_be16(skb, MPTCP_ATTR_SPORT, issk->inet_sport))
1964 if (nla_put_be16(skb, MPTCP_ATTR_DPORT, issk->inet_dport))
1967 sf = mptcp_subflow_ctx(ssk);
1968 if (WARN_ON_ONCE(!sf))
1971 if (nla_put_u8(skb, MPTCP_ATTR_LOC_ID, sf->local_id))
1974 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, sf->remote_id))
1980 static int mptcp_event_put_token_and_ssk(struct sk_buff *skb,
1981 const struct mptcp_sock *msk,
1982 const struct sock *ssk)
1984 const struct sock *sk = (const struct sock *)msk;
1985 const struct mptcp_subflow_context *sf;
1988 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
1991 if (mptcp_event_add_subflow(skb, ssk))
1994 sf = mptcp_subflow_ctx(ssk);
1995 if (WARN_ON_ONCE(!sf))
1998 if (nla_put_u8(skb, MPTCP_ATTR_BACKUP, sf->backup))
2001 if (ssk->sk_bound_dev_if &&
2002 nla_put_s32(skb, MPTCP_ATTR_IF_IDX, ssk->sk_bound_dev_if))
2005 sk_err = ssk->sk_err;
2006 if (sk_err && sk->sk_state == TCP_ESTABLISHED &&
2007 nla_put_u8(skb, MPTCP_ATTR_ERROR, sk_err))
2013 static int mptcp_event_sub_established(struct sk_buff *skb,
2014 const struct mptcp_sock *msk,
2015 const struct sock *ssk)
2017 return mptcp_event_put_token_and_ssk(skb, msk, ssk);
2020 static int mptcp_event_sub_closed(struct sk_buff *skb,
2021 const struct mptcp_sock *msk,
2022 const struct sock *ssk)
2024 const struct mptcp_subflow_context *sf;
2026 if (mptcp_event_put_token_and_ssk(skb, msk, ssk))
2029 sf = mptcp_subflow_ctx(ssk);
2030 if (!sf->reset_seen)
2033 if (nla_put_u32(skb, MPTCP_ATTR_RESET_REASON, sf->reset_reason))
2036 if (nla_put_u32(skb, MPTCP_ATTR_RESET_FLAGS, sf->reset_transient))
2042 static int mptcp_event_created(struct sk_buff *skb,
2043 const struct mptcp_sock *msk,
2044 const struct sock *ssk)
2046 int err = nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token);
2051 if (nla_put_u8(skb, MPTCP_ATTR_SERVER_SIDE, READ_ONCE(msk->pm.server_side)))
2054 return mptcp_event_add_subflow(skb, ssk);
2057 void mptcp_event_addr_removed(const struct mptcp_sock *msk, uint8_t id)
2059 struct net *net = sock_net((const struct sock *)msk);
2060 struct nlmsghdr *nlh;
2061 struct sk_buff *skb;
2063 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2066 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2070 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, MPTCP_EVENT_REMOVED);
2072 goto nla_put_failure;
2074 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
2075 goto nla_put_failure;
2077 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, id))
2078 goto nla_put_failure;
2080 genlmsg_end(skb, nlh);
2081 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
2088 void mptcp_event_addr_announced(const struct sock *ssk,
2089 const struct mptcp_addr_info *info)
2091 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
2092 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
2093 struct net *net = sock_net(ssk);
2094 struct nlmsghdr *nlh;
2095 struct sk_buff *skb;
2097 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2100 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
2104 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0,
2105 MPTCP_EVENT_ANNOUNCED);
2107 goto nla_put_failure;
2109 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token))
2110 goto nla_put_failure;
2112 if (nla_put_u8(skb, MPTCP_ATTR_REM_ID, info->id))
2113 goto nla_put_failure;
2115 if (nla_put_be16(skb, MPTCP_ATTR_DPORT,
2117 inet_sk(ssk)->inet_dport :
2119 goto nla_put_failure;
2121 switch (info->family) {
2123 if (nla_put_in_addr(skb, MPTCP_ATTR_DADDR4, info->addr.s_addr))
2124 goto nla_put_failure;
2126 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
2128 if (nla_put_in6_addr(skb, MPTCP_ATTR_DADDR6, &info->addr6))
2129 goto nla_put_failure;
2134 goto nla_put_failure;
2137 genlmsg_end(skb, nlh);
2138 mptcp_nl_mcast_send(net, skb, GFP_ATOMIC);
2145 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
2146 const struct sock *ssk, gfp_t gfp)
2148 struct net *net = sock_net((const struct sock *)msk);
2149 struct nlmsghdr *nlh;
2150 struct sk_buff *skb;
2152 if (!genl_has_listeners(&mptcp_genl_family, net, MPTCP_PM_EV_GRP_OFFSET))
2155 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
2159 nlh = genlmsg_put(skb, 0, 0, &mptcp_genl_family, 0, type);
2161 goto nla_put_failure;
2164 case MPTCP_EVENT_UNSPEC:
2167 case MPTCP_EVENT_CREATED:
2168 case MPTCP_EVENT_ESTABLISHED:
2169 if (mptcp_event_created(skb, msk, ssk) < 0)
2170 goto nla_put_failure;
2172 case MPTCP_EVENT_CLOSED:
2173 if (nla_put_u32(skb, MPTCP_ATTR_TOKEN, msk->token) < 0)
2174 goto nla_put_failure;
2176 case MPTCP_EVENT_ANNOUNCED:
2177 case MPTCP_EVENT_REMOVED:
2178 /* call mptcp_event_addr_announced()/removed instead */
2181 case MPTCP_EVENT_SUB_ESTABLISHED:
2182 case MPTCP_EVENT_SUB_PRIORITY:
2183 if (mptcp_event_sub_established(skb, msk, ssk) < 0)
2184 goto nla_put_failure;
2186 case MPTCP_EVENT_SUB_CLOSED:
2187 if (mptcp_event_sub_closed(skb, msk, ssk) < 0)
2188 goto nla_put_failure;
2192 genlmsg_end(skb, nlh);
2193 mptcp_nl_mcast_send(net, skb, gfp);
2200 static const struct genl_small_ops mptcp_pm_ops[] = {
2202 .cmd = MPTCP_PM_CMD_ADD_ADDR,
2203 .doit = mptcp_nl_cmd_add_addr,
2204 .flags = GENL_ADMIN_PERM,
2207 .cmd = MPTCP_PM_CMD_DEL_ADDR,
2208 .doit = mptcp_nl_cmd_del_addr,
2209 .flags = GENL_ADMIN_PERM,
2212 .cmd = MPTCP_PM_CMD_FLUSH_ADDRS,
2213 .doit = mptcp_nl_cmd_flush_addrs,
2214 .flags = GENL_ADMIN_PERM,
2217 .cmd = MPTCP_PM_CMD_GET_ADDR,
2218 .doit = mptcp_nl_cmd_get_addr,
2219 .dumpit = mptcp_nl_cmd_dump_addrs,
2222 .cmd = MPTCP_PM_CMD_SET_LIMITS,
2223 .doit = mptcp_nl_cmd_set_limits,
2224 .flags = GENL_ADMIN_PERM,
2227 .cmd = MPTCP_PM_CMD_GET_LIMITS,
2228 .doit = mptcp_nl_cmd_get_limits,
2231 .cmd = MPTCP_PM_CMD_SET_FLAGS,
2232 .doit = mptcp_nl_cmd_set_flags,
2233 .flags = GENL_ADMIN_PERM,
2236 .cmd = MPTCP_PM_CMD_ANNOUNCE,
2237 .doit = mptcp_nl_cmd_announce,
2238 .flags = GENL_ADMIN_PERM,
2241 .cmd = MPTCP_PM_CMD_REMOVE,
2242 .doit = mptcp_nl_cmd_remove,
2243 .flags = GENL_ADMIN_PERM,
2246 .cmd = MPTCP_PM_CMD_SUBFLOW_CREATE,
2247 .doit = mptcp_nl_cmd_sf_create,
2248 .flags = GENL_ADMIN_PERM,
2251 .cmd = MPTCP_PM_CMD_SUBFLOW_DESTROY,
2252 .doit = mptcp_nl_cmd_sf_destroy,
2253 .flags = GENL_ADMIN_PERM,
2257 static struct genl_family mptcp_genl_family __ro_after_init = {
2258 .name = MPTCP_PM_NAME,
2259 .version = MPTCP_PM_VER,
2260 .maxattr = MPTCP_PM_ATTR_MAX,
2261 .policy = mptcp_pm_policy,
2263 .module = THIS_MODULE,
2264 .small_ops = mptcp_pm_ops,
2265 .n_small_ops = ARRAY_SIZE(mptcp_pm_ops),
2266 .mcgrps = mptcp_pm_mcgrps,
2267 .n_mcgrps = ARRAY_SIZE(mptcp_pm_mcgrps),
2270 static int __net_init pm_nl_init_net(struct net *net)
2272 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net);
2274 INIT_LIST_HEAD_RCU(&pernet->local_addr_list);
2276 /* Cit. 2 subflows ought to be enough for anybody. */
2277 pernet->subflows_max = 2;
2278 pernet->next_id = 1;
2279 pernet->stale_loss_cnt = 4;
2280 spin_lock_init(&pernet->lock);
2282 /* No need to initialize other pernet fields, the struct is zeroed at
2289 static void __net_exit pm_nl_exit_net(struct list_head *net_list)
2293 list_for_each_entry(net, net_list, exit_list) {
2294 struct pm_nl_pernet *pernet = pm_nl_get_pernet(net);
2296 /* net is removed from namespace list, can't race with
2297 * other modifiers, also netns core already waited for a
2300 __flush_addrs(&pernet->local_addr_list);
2304 static struct pernet_operations mptcp_pm_pernet_ops = {
2305 .init = pm_nl_init_net,
2306 .exit_batch = pm_nl_exit_net,
2307 .id = &pm_nl_pernet_id,
2308 .size = sizeof(struct pm_nl_pernet),
2311 void __init mptcp_pm_nl_init(void)
2313 if (register_pernet_subsys(&mptcp_pm_pernet_ops) < 0)
2314 panic("Failed to register MPTCP PM pernet subsystem.\n");
2316 if (genl_register_family(&mptcp_genl_family))
2317 panic("Failed to register MPTCP PM netlink family\n");