1 /* SPDX-License-Identifier: GPL-2.0 */
4 * Copyright (c) 2017 - 2019, Intel Corporation.
7 #ifndef __MPTCP_PROTOCOL_H
8 #define __MPTCP_PROTOCOL_H
10 #include <linux/random.h>
12 #include <net/inet_connection_sock.h>
13 #include <uapi/linux/mptcp.h>
15 #define MPTCP_SUPPORTED_VERSION 1
17 /* MPTCP option bits */
18 #define OPTION_MPTCP_MPC_SYN BIT(0)
19 #define OPTION_MPTCP_MPC_SYNACK BIT(1)
20 #define OPTION_MPTCP_MPC_ACK BIT(2)
21 #define OPTION_MPTCP_MPJ_SYN BIT(3)
22 #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
23 #define OPTION_MPTCP_MPJ_ACK BIT(5)
24 #define OPTION_MPTCP_ADD_ADDR BIT(6)
25 #define OPTION_MPTCP_ADD_ADDR6 BIT(7)
26 #define OPTION_MPTCP_RM_ADDR BIT(8)
27 #define OPTION_MPTCP_FASTCLOSE BIT(9)
28 #define OPTION_MPTCP_PRIO BIT(10)
30 /* MPTCP option subtypes */
31 #define MPTCPOPT_MP_CAPABLE 0
32 #define MPTCPOPT_MP_JOIN 1
33 #define MPTCPOPT_DSS 2
34 #define MPTCPOPT_ADD_ADDR 3
35 #define MPTCPOPT_RM_ADDR 4
36 #define MPTCPOPT_MP_PRIO 5
37 #define MPTCPOPT_MP_FAIL 6
38 #define MPTCPOPT_MP_FASTCLOSE 7
40 /* MPTCP suboption lengths */
41 #define TCPOLEN_MPTCP_MPC_SYN 4
42 #define TCPOLEN_MPTCP_MPC_SYNACK 12
43 #define TCPOLEN_MPTCP_MPC_ACK 20
44 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
45 #define TCPOLEN_MPTCP_MPJ_SYN 12
46 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
47 #define TCPOLEN_MPTCP_MPJ_ACK 24
48 #define TCPOLEN_MPTCP_DSS_BASE 4
49 #define TCPOLEN_MPTCP_DSS_ACK32 4
50 #define TCPOLEN_MPTCP_DSS_ACK64 8
51 #define TCPOLEN_MPTCP_DSS_MAP32 10
52 #define TCPOLEN_MPTCP_DSS_MAP64 14
53 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
54 #define TCPOLEN_MPTCP_ADD_ADDR 16
55 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 20
56 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12
58 #define TCPOLEN_MPTCP_ADD_ADDR6 28
59 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32
60 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
62 #define TCPOLEN_MPTCP_PORT_LEN 4
63 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4
64 #define TCPOLEN_MPTCP_PRIO 3
65 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
66 #define TCPOLEN_MPTCP_FASTCLOSE 12
68 /* MPTCP MP_JOIN flags */
69 #define MPTCPOPT_BACKUP BIT(0)
70 #define MPTCPOPT_HMAC_LEN 20
71 #define MPTCPOPT_THMAC_LEN 8
73 /* MPTCP MP_CAPABLE flags */
74 #define MPTCP_VERSION_MASK (0x0F)
75 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
76 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
77 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
78 #define MPTCP_CAP_FLAG_MASK (0x3F)
81 #define MPTCP_DSS_DATA_FIN BIT(4)
82 #define MPTCP_DSS_DSN64 BIT(3)
83 #define MPTCP_DSS_HAS_MAP BIT(2)
84 #define MPTCP_DSS_ACK64 BIT(1)
85 #define MPTCP_DSS_HAS_ACK BIT(0)
86 #define MPTCP_DSS_FLAG_MASK (0x1F)
88 /* MPTCP ADD_ADDR flags */
89 #define MPTCP_ADDR_ECHO BIT(0)
90 #define MPTCP_ADDR_IPVERSION_4 4
91 #define MPTCP_ADDR_IPVERSION_6 6
93 /* MPTCP MP_PRIO flags */
94 #define MPTCP_PRIO_BKUP BIT(0)
96 /* MPTCP socket flags */
97 #define MPTCP_DATA_READY 0
98 #define MPTCP_NOSPACE 1
99 #define MPTCP_WORK_RTX 2
100 #define MPTCP_WORK_EOF 3
101 #define MPTCP_FALLBACK_DONE 4
102 #define MPTCP_WORK_CLOSE_SUBFLOW 5
103 #define MPTCP_PUSH_PENDING 6
104 #define MPTCP_CLEAN_UNA 7
105 #define MPTCP_ERROR_REPORT 8
107 static inline bool before64(__u64 seq1, __u64 seq2)
109 return (__s64)(seq1 - seq2) < 0;
112 #define after64(seq2, seq1) before64(seq1, seq2)
114 struct mptcp_options_received {
134 u8 hmac[MPTCPOPT_HMAC_LEN];
147 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
148 struct in6_addr addr6;
155 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
157 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
158 ((nib & 0xF) << 8) | field);
161 struct mptcp_addr_info {
169 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
170 struct in6_addr addr6;
175 enum mptcp_pm_status {
176 MPTCP_PM_ADD_ADDR_RECEIVED,
177 MPTCP_PM_ADD_ADDR_SEND_ACK,
178 MPTCP_PM_RM_ADDR_RECEIVED,
179 MPTCP_PM_ESTABLISHED,
180 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
181 MPTCP_PM_SUBFLOW_ESTABLISHED,
184 enum mptcp_addr_signal_status {
185 MPTCP_ADD_ADDR_SIGNAL,
189 MPTCP_RM_ADDR_SIGNAL,
192 struct mptcp_pm_data {
193 struct mptcp_addr_info local;
194 struct mptcp_addr_info remote;
195 struct list_head anno_list;
197 spinlock_t lock; /*protects the whole PM data */
204 u8 add_addr_signaled;
205 u8 add_addr_accepted;
212 struct mptcp_data_frag {
213 struct list_head list;
222 /* MPTCP connection sock */
224 /* inet_connection_sock must be the first member */
225 struct inet_connection_sock sk;
232 u64 rcv_data_fin_seq;
234 struct sock *last_snd;
239 unsigned long timer_ival;
244 bool fully_established;
246 bool snd_data_fin_enable;
248 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
249 spinlock_t join_list_lock;
250 struct sock *ack_hint;
251 struct work_struct work;
252 struct sk_buff *ooo_last_skb;
253 struct rb_root out_of_order_queue;
254 struct sk_buff_head receive_queue;
255 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */
258 struct list_head conn_list;
259 struct list_head rtx_queue;
260 struct mptcp_data_frag *first_pending;
261 struct list_head join_list;
262 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
264 struct mptcp_pm_data pm;
266 u32 space; /* bytes copied in last measurement window */
267 u32 copied; /* bytes copied in this measurement window */
268 u64 time; /* start time of measurement window */
269 u64 rtt_us; /* last maximum rtt of subflows */
273 #define mptcp_lock_sock(___sk, cb) do { \
274 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
276 spin_lock_bh(&__sk->sk_lock.slock); \
277 if (__sk->sk_lock.owned) \
280 __sk->sk_lock.owned = 1; \
281 spin_unlock(&__sk->sk_lock.slock); \
282 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
286 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
287 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
289 #define mptcp_for_each_subflow(__msk, __subflow) \
290 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
292 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
294 sock_owned_by_me((const struct sock *)msk);
297 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
299 return (struct mptcp_sock *)sk;
302 static inline int __mptcp_space(const struct sock *sk)
304 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released);
307 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
309 const struct mptcp_sock *msk = mptcp_sk(sk);
311 return READ_ONCE(msk->first_pending);
314 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
316 struct mptcp_sock *msk = mptcp_sk(sk);
317 struct mptcp_data_frag *cur;
319 cur = msk->first_pending;
320 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
321 list_next_entry(cur, list);
324 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
326 struct mptcp_sock *msk = mptcp_sk(sk);
328 if (!msk->first_pending)
331 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
334 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
337 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
339 struct mptcp_sock *msk = mptcp_sk(sk);
341 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
344 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
347 struct mptcp_subflow_request_sock {
348 struct tcp_request_sock sk;
361 struct mptcp_sock *msk;
362 struct hlist_nulls_node token_node;
365 static inline struct mptcp_subflow_request_sock *
366 mptcp_subflow_rsk(const struct request_sock *rsk)
368 return (struct mptcp_subflow_request_sock *)rsk;
371 enum mptcp_data_avail {
372 MPTCP_SUBFLOW_NODATA,
373 MPTCP_SUBFLOW_DATA_AVAIL,
374 MPTCP_SUBFLOW_OOO_DATA
377 struct mptcp_delegated_action {
378 struct napi_struct napi;
379 struct list_head head;
382 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
384 #define MPTCP_DELEGATE_SEND 0
386 /* MPTCP subflow context */
387 struct mptcp_subflow_context {
388 struct list_head node;/* conn_list of subflows */
399 u32 request_mptcp : 1, /* send MP_CAPABLE */
400 request_join : 1, /* send MP_JOIN */
402 mp_capable : 1, /* remote is MPTCP capable */
403 mp_join : 1, /* remote is JOINing */
404 fully_established : 1, /* path validated */
405 pm_notified : 1, /* PM hook called for established status */
412 can_ack : 1, /* only after processing the remote a key */
413 disposable : 1; /* ctx can be free at ulp release time */
414 enum mptcp_data_avail data_avail;
419 u8 hmac[MPTCPOPT_HMAC_LEN];
423 long delegated_status;
424 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
426 struct sock *tcp_sock; /* tcp sk backpointer */
427 struct sock *conn; /* parent mptcp_sock */
428 const struct inet_connection_sock_af_ops *icsk_af_ops;
429 void (*tcp_data_ready)(struct sock *sk);
430 void (*tcp_state_change)(struct sock *sk);
431 void (*tcp_write_space)(struct sock *sk);
432 void (*tcp_error_report)(struct sock *sk);
437 static inline struct mptcp_subflow_context *
438 mptcp_subflow_ctx(const struct sock *sk)
440 struct inet_connection_sock *icsk = inet_csk(sk);
442 /* Use RCU on icsk_ulp_data only for sock diag code */
443 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
446 static inline struct sock *
447 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
449 return subflow->tcp_sock;
453 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
455 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
456 subflow->ssn_offset -
457 subflow->map_subflow_seq;
461 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
463 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
466 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
467 struct mptcp_subflow_context *subflow)
469 sock_hold(mptcp_subflow_tcp_sock(subflow));
470 spin_lock_bh(&msk->join_list_lock);
471 list_add_tail(&subflow->node, &msk->join_list);
472 spin_unlock_bh(&msk->join_list_lock);
475 void mptcp_subflow_process_delegated(struct sock *ssk);
477 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
479 struct mptcp_delegated_action *delegated;
482 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
483 * ensures the below list check sees list updates done prior to status
486 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
487 /* still on delegated list from previous scheduling */
488 if (!list_empty(&subflow->delegated_node))
491 /* the caller held the subflow bh socket lock */
492 lockdep_assert_in_softirq();
494 delegated = this_cpu_ptr(&mptcp_delegated_actions);
495 schedule = list_empty(&delegated->head);
496 list_add_tail(&subflow->delegated_node, &delegated->head);
497 sock_hold(mptcp_subflow_tcp_sock(subflow));
499 napi_schedule(&delegated->napi);
503 static inline struct mptcp_subflow_context *
504 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
506 struct mptcp_subflow_context *ret;
508 if (list_empty(&delegated->head))
511 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
512 list_del_init(&ret->delegated_node);
516 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
518 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
521 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
523 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
524 * touching the status bit
527 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
530 int mptcp_is_enabled(struct net *net);
531 unsigned int mptcp_get_add_addr_timeout(struct net *net);
532 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
533 struct mptcp_options_received *mp_opt);
534 bool mptcp_subflow_data_available(struct sock *sk);
535 void __init mptcp_subflow_init(void);
536 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
537 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
538 struct mptcp_subflow_context *subflow);
539 void mptcp_subflow_reset(struct sock *ssk);
540 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
541 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
543 /* called with sk socket lock held */
544 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
545 const struct mptcp_addr_info *remote);
546 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
547 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
548 struct sockaddr_storage *addr,
549 unsigned short family);
551 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
552 struct mptcp_subflow_context *ctx)
554 sk->sk_data_ready = ctx->tcp_data_ready;
555 sk->sk_state_change = ctx->tcp_state_change;
556 sk->sk_write_space = ctx->tcp_write_space;
557 sk->sk_error_report = ctx->tcp_error_report;
559 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
562 void __init mptcp_proto_init(void);
563 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
564 int __init mptcp_proto_v6_init(void);
567 struct sock *mptcp_sk_clone(const struct sock *sk,
568 const struct mptcp_options_received *mp_opt,
569 struct request_sock *req);
570 void mptcp_get_options(const struct sk_buff *skb,
571 struct mptcp_options_received *mp_opt);
573 void mptcp_finish_connect(struct sock *sk);
574 static inline bool mptcp_is_fully_established(struct sock *sk)
576 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
577 READ_ONCE(mptcp_sk(sk)->fully_established);
579 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
580 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
581 bool mptcp_finish_join(struct sock *sk);
582 bool mptcp_schedule_work(struct sock *sk);
583 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
584 void __mptcp_data_acked(struct sock *sk);
585 void __mptcp_error_report(struct sock *sk);
586 void mptcp_subflow_eof(struct sock *sk);
587 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
588 void __mptcp_flush_join_list(struct mptcp_sock *msk);
589 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
591 return READ_ONCE(msk->snd_data_fin_enable) &&
592 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
595 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
597 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
600 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
604 static inline void mptcp_write_space(struct sock *sk)
606 if (sk_stream_is_writeable(sk)) {
607 /* pairs with memory barrier in mptcp_poll */
609 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
610 sk_stream_write_space(sk);
614 void mptcp_destroy_common(struct mptcp_sock *msk);
616 void __init mptcp_token_init(void);
617 static inline void mptcp_token_init_request(struct request_sock *req)
619 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
622 int mptcp_token_new_request(struct request_sock *req);
623 void mptcp_token_destroy_request(struct request_sock *req);
624 int mptcp_token_new_connect(struct sock *sk);
625 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
626 struct mptcp_sock *msk);
627 bool mptcp_token_exists(u32 token);
628 struct mptcp_sock *mptcp_token_get_sock(u32 token);
629 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
631 void mptcp_token_destroy(struct mptcp_sock *msk);
633 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
635 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
637 void __init mptcp_pm_init(void);
638 void mptcp_pm_data_init(struct mptcp_sock *msk);
639 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
640 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
641 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
642 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
643 void mptcp_pm_subflow_established(struct mptcp_sock *msk,
644 struct mptcp_subflow_context *subflow);
645 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
646 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
647 const struct mptcp_addr_info *addr);
648 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
649 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
650 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
651 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
652 struct mptcp_addr_info *addr,
654 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
655 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
656 struct mptcp_pm_add_entry *
657 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
658 struct mptcp_addr_info *addr);
660 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
661 const struct mptcp_addr_info *addr,
662 bool echo, bool port);
663 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
664 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
666 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
667 const struct sock *ssk, gfp_t gfp);
668 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
669 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
671 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
673 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
676 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
678 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
681 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
683 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
686 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
688 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
691 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
693 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
696 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
698 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
700 if (family == AF_INET6)
701 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
703 len += MPTCPOPT_THMAC_LEN;
705 len += TCPOLEN_MPTCP_PORT_LEN;
710 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
711 struct mptcp_addr_info *saddr, bool *echo, bool *port);
712 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
714 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
716 void __init mptcp_pm_nl_init(void);
717 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
718 void mptcp_pm_nl_work(struct mptcp_sock *msk);
719 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
720 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
721 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
722 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
723 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
724 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
726 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
728 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
731 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
733 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
735 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
738 static inline bool mptcp_check_fallback(const struct sock *sk)
740 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
741 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
743 return __mptcp_check_fallback(msk);
746 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
748 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
749 pr_debug("TCP fallback already done (msk=%p)", msk);
752 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
755 static inline void mptcp_do_fallback(struct sock *sk)
757 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
758 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
760 __mptcp_do_fallback(msk);
763 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
765 static inline bool subflow_simultaneous_connect(struct sock *sk)
767 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
768 struct sock *parent = subflow->conn;
770 return sk->sk_state == TCP_ESTABLISHED &&
771 !mptcp_sk(parent)->pm.server_side &&
772 !subflow->conn_finished;
775 #ifdef CONFIG_SYN_COOKIES
776 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
777 struct sk_buff *skb);
778 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
779 struct sk_buff *skb);
780 void __init mptcp_join_cookie_init(void);
783 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
784 struct sk_buff *skb) {}
786 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
792 static inline void mptcp_join_cookie_init(void) {}
795 #endif /* __MPTCP_PROTOCOL_H */