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 18
56 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
58 #define TCPOLEN_MPTCP_ADD_ADDR6 28
59 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
60 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
62 #define TCPOLEN_MPTCP_PORT_LEN 2
63 #define TCPOLEN_MPTCP_PORT_ALIGN 2
64 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4
65 #define TCPOLEN_MPTCP_PRIO 3
66 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
67 #define TCPOLEN_MPTCP_FASTCLOSE 12
69 /* MPTCP MP_JOIN flags */
70 #define MPTCPOPT_BACKUP BIT(0)
71 #define MPTCPOPT_HMAC_LEN 20
72 #define MPTCPOPT_THMAC_LEN 8
74 /* MPTCP MP_CAPABLE flags */
75 #define MPTCP_VERSION_MASK (0x0F)
76 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
77 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
78 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
79 #define MPTCP_CAP_FLAG_MASK (0x3F)
82 #define MPTCP_DSS_DATA_FIN BIT(4)
83 #define MPTCP_DSS_DSN64 BIT(3)
84 #define MPTCP_DSS_HAS_MAP BIT(2)
85 #define MPTCP_DSS_ACK64 BIT(1)
86 #define MPTCP_DSS_HAS_ACK BIT(0)
87 #define MPTCP_DSS_FLAG_MASK (0x1F)
89 /* MPTCP ADD_ADDR flags */
90 #define MPTCP_ADDR_ECHO BIT(0)
91 #define MPTCP_ADDR_IPVERSION_4 4
92 #define MPTCP_ADDR_IPVERSION_6 6
94 /* MPTCP MP_PRIO flags */
95 #define MPTCP_PRIO_BKUP BIT(0)
97 /* MPTCP socket flags */
98 #define MPTCP_DATA_READY 0
99 #define MPTCP_NOSPACE 1
100 #define MPTCP_WORK_RTX 2
101 #define MPTCP_WORK_EOF 3
102 #define MPTCP_FALLBACK_DONE 4
103 #define MPTCP_WORK_CLOSE_SUBFLOW 5
104 #define MPTCP_PUSH_PENDING 6
105 #define MPTCP_CLEAN_UNA 7
106 #define MPTCP_ERROR_REPORT 8
108 static inline bool before64(__u64 seq1, __u64 seq2)
110 return (__s64)(seq1 - seq2) < 0;
113 #define after64(seq2, seq1) before64(seq1, seq2)
115 struct mptcp_options_received {
135 u8 hmac[MPTCPOPT_HMAC_LEN];
148 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
149 struct in6_addr addr6;
156 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
158 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
159 ((nib & 0xF) << 8) | field);
162 struct mptcp_addr_info {
170 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
171 struct in6_addr addr6;
176 enum mptcp_pm_status {
177 MPTCP_PM_ADD_ADDR_RECEIVED,
178 MPTCP_PM_ADD_ADDR_SEND_ACK,
179 MPTCP_PM_RM_ADDR_RECEIVED,
180 MPTCP_PM_ESTABLISHED,
181 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
182 MPTCP_PM_SUBFLOW_ESTABLISHED,
185 enum mptcp_addr_signal_status {
186 MPTCP_ADD_ADDR_SIGNAL,
190 MPTCP_RM_ADDR_SIGNAL,
193 struct mptcp_pm_data {
194 struct mptcp_addr_info local;
195 struct mptcp_addr_info remote;
196 struct list_head anno_list;
198 spinlock_t lock; /*protects the whole PM data */
205 u8 add_addr_signaled;
206 u8 add_addr_accepted;
213 struct mptcp_data_frag {
214 struct list_head list;
223 /* MPTCP connection sock */
225 /* inet_connection_sock must be the first member */
226 struct inet_connection_sock sk;
233 u64 rcv_data_fin_seq;
235 struct sock *last_snd;
240 unsigned long timer_ival;
245 bool fully_established;
247 bool snd_data_fin_enable;
249 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
250 spinlock_t join_list_lock;
251 struct sock *ack_hint;
252 struct work_struct work;
253 struct sk_buff *ooo_last_skb;
254 struct rb_root out_of_order_queue;
255 struct sk_buff_head receive_queue;
256 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */
259 struct list_head conn_list;
260 struct list_head rtx_queue;
261 struct mptcp_data_frag *first_pending;
262 struct list_head join_list;
263 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
265 struct mptcp_pm_data pm;
267 u32 space; /* bytes copied in last measurement window */
268 u32 copied; /* bytes copied in this measurement window */
269 u64 time; /* start time of measurement window */
270 u64 rtt_us; /* last maximum rtt of subflows */
274 #define mptcp_lock_sock(___sk, cb) do { \
275 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
277 spin_lock_bh(&__sk->sk_lock.slock); \
278 if (__sk->sk_lock.owned) \
281 __sk->sk_lock.owned = 1; \
282 spin_unlock(&__sk->sk_lock.slock); \
283 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
287 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
288 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
290 #define mptcp_for_each_subflow(__msk, __subflow) \
291 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
293 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
295 sock_owned_by_me((const struct sock *)msk);
298 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
300 return (struct mptcp_sock *)sk;
303 static inline int __mptcp_space(const struct sock *sk)
305 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released);
308 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
310 const struct mptcp_sock *msk = mptcp_sk(sk);
312 return READ_ONCE(msk->first_pending);
315 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
317 struct mptcp_sock *msk = mptcp_sk(sk);
318 struct mptcp_data_frag *cur;
320 cur = msk->first_pending;
321 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
322 list_next_entry(cur, list);
325 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
327 struct mptcp_sock *msk = mptcp_sk(sk);
329 if (!msk->first_pending)
332 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
335 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
338 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
340 struct mptcp_sock *msk = mptcp_sk(sk);
342 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
345 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
348 struct mptcp_subflow_request_sock {
349 struct tcp_request_sock sk;
362 struct mptcp_sock *msk;
363 struct hlist_nulls_node token_node;
366 static inline struct mptcp_subflow_request_sock *
367 mptcp_subflow_rsk(const struct request_sock *rsk)
369 return (struct mptcp_subflow_request_sock *)rsk;
372 enum mptcp_data_avail {
373 MPTCP_SUBFLOW_NODATA,
374 MPTCP_SUBFLOW_DATA_AVAIL,
375 MPTCP_SUBFLOW_OOO_DATA
378 struct mptcp_delegated_action {
379 struct napi_struct napi;
380 struct list_head head;
383 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
385 #define MPTCP_DELEGATE_SEND 0
387 /* MPTCP subflow context */
388 struct mptcp_subflow_context {
389 struct list_head node;/* conn_list of subflows */
400 u32 request_mptcp : 1, /* send MP_CAPABLE */
401 request_join : 1, /* send MP_JOIN */
403 mp_capable : 1, /* remote is MPTCP capable */
404 mp_join : 1, /* remote is JOINing */
405 fully_established : 1, /* path validated */
406 pm_notified : 1, /* PM hook called for established status */
413 can_ack : 1, /* only after processing the remote a key */
414 disposable : 1; /* ctx can be free at ulp release time */
415 enum mptcp_data_avail data_avail;
420 u8 hmac[MPTCPOPT_HMAC_LEN];
424 long delegated_status;
425 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
427 struct sock *tcp_sock; /* tcp sk backpointer */
428 struct sock *conn; /* parent mptcp_sock */
429 const struct inet_connection_sock_af_ops *icsk_af_ops;
430 void (*tcp_data_ready)(struct sock *sk);
431 void (*tcp_state_change)(struct sock *sk);
432 void (*tcp_write_space)(struct sock *sk);
433 void (*tcp_error_report)(struct sock *sk);
438 static inline struct mptcp_subflow_context *
439 mptcp_subflow_ctx(const struct sock *sk)
441 struct inet_connection_sock *icsk = inet_csk(sk);
443 /* Use RCU on icsk_ulp_data only for sock diag code */
444 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
447 static inline struct sock *
448 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
450 return subflow->tcp_sock;
454 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
456 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
457 subflow->ssn_offset -
458 subflow->map_subflow_seq;
462 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
464 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
467 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
468 struct mptcp_subflow_context *subflow)
470 sock_hold(mptcp_subflow_tcp_sock(subflow));
471 spin_lock_bh(&msk->join_list_lock);
472 list_add_tail(&subflow->node, &msk->join_list);
473 spin_unlock_bh(&msk->join_list_lock);
476 void mptcp_subflow_process_delegated(struct sock *ssk);
478 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
480 struct mptcp_delegated_action *delegated;
483 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
484 * ensures the below list check sees list updates done prior to status
487 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
488 /* still on delegated list from previous scheduling */
489 if (!list_empty(&subflow->delegated_node))
492 /* the caller held the subflow bh socket lock */
493 lockdep_assert_in_softirq();
495 delegated = this_cpu_ptr(&mptcp_delegated_actions);
496 schedule = list_empty(&delegated->head);
497 list_add_tail(&subflow->delegated_node, &delegated->head);
498 sock_hold(mptcp_subflow_tcp_sock(subflow));
500 napi_schedule(&delegated->napi);
504 static inline struct mptcp_subflow_context *
505 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
507 struct mptcp_subflow_context *ret;
509 if (list_empty(&delegated->head))
512 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
513 list_del_init(&ret->delegated_node);
517 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
519 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
522 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
524 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
525 * touching the status bit
528 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
531 int mptcp_is_enabled(struct net *net);
532 unsigned int mptcp_get_add_addr_timeout(struct net *net);
533 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
534 struct mptcp_options_received *mp_opt);
535 bool mptcp_subflow_data_available(struct sock *sk);
536 void __init mptcp_subflow_init(void);
537 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
538 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
539 struct mptcp_subflow_context *subflow);
540 void mptcp_subflow_reset(struct sock *ssk);
541 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
542 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
544 /* called with sk socket lock held */
545 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
546 const struct mptcp_addr_info *remote);
547 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
548 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
549 struct sockaddr_storage *addr,
550 unsigned short family);
552 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
553 struct mptcp_subflow_context *ctx)
555 sk->sk_data_ready = ctx->tcp_data_ready;
556 sk->sk_state_change = ctx->tcp_state_change;
557 sk->sk_write_space = ctx->tcp_write_space;
558 sk->sk_error_report = ctx->tcp_error_report;
560 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
563 void __init mptcp_proto_init(void);
564 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
565 int __init mptcp_proto_v6_init(void);
568 struct sock *mptcp_sk_clone(const struct sock *sk,
569 const struct mptcp_options_received *mp_opt,
570 struct request_sock *req);
571 void mptcp_get_options(const struct sk_buff *skb,
572 struct mptcp_options_received *mp_opt);
574 void mptcp_finish_connect(struct sock *sk);
575 static inline bool mptcp_is_fully_established(struct sock *sk)
577 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
578 READ_ONCE(mptcp_sk(sk)->fully_established);
580 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
581 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
582 bool mptcp_finish_join(struct sock *sk);
583 bool mptcp_schedule_work(struct sock *sk);
584 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
585 void __mptcp_data_acked(struct sock *sk);
586 void __mptcp_error_report(struct sock *sk);
587 void mptcp_subflow_eof(struct sock *sk);
588 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
589 void __mptcp_flush_join_list(struct mptcp_sock *msk);
590 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
592 return READ_ONCE(msk->snd_data_fin_enable) &&
593 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
596 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
598 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
601 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
605 static inline void mptcp_write_space(struct sock *sk)
607 if (sk_stream_is_writeable(sk)) {
608 /* pairs with memory barrier in mptcp_poll */
610 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
611 sk_stream_write_space(sk);
615 void mptcp_destroy_common(struct mptcp_sock *msk);
617 void __init mptcp_token_init(void);
618 static inline void mptcp_token_init_request(struct request_sock *req)
620 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
623 int mptcp_token_new_request(struct request_sock *req);
624 void mptcp_token_destroy_request(struct request_sock *req);
625 int mptcp_token_new_connect(struct sock *sk);
626 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
627 struct mptcp_sock *msk);
628 bool mptcp_token_exists(u32 token);
629 struct mptcp_sock *mptcp_token_get_sock(u32 token);
630 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
632 void mptcp_token_destroy(struct mptcp_sock *msk);
634 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
636 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
638 void __init mptcp_pm_init(void);
639 void mptcp_pm_data_init(struct mptcp_sock *msk);
640 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
641 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
642 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
643 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
644 void mptcp_pm_subflow_established(struct mptcp_sock *msk,
645 struct mptcp_subflow_context *subflow);
646 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
647 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
648 const struct mptcp_addr_info *addr);
649 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
650 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
651 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
652 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
653 struct mptcp_addr_info *addr,
655 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
656 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
657 struct mptcp_pm_add_entry *
658 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
659 struct mptcp_addr_info *addr);
661 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
662 const struct mptcp_addr_info *addr,
663 bool echo, bool port);
664 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
665 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
667 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
668 const struct sock *ssk, gfp_t gfp);
669 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
670 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
672 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
674 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
677 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
679 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
682 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
684 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
687 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
689 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
692 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
694 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
697 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
699 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
701 if (family == AF_INET6)
702 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
704 len += MPTCPOPT_THMAC_LEN;
705 /* account for 2 trailing 'nop' options */
707 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
712 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
713 struct mptcp_addr_info *saddr, bool *echo, bool *port);
714 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
716 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
718 void __init mptcp_pm_nl_init(void);
719 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
720 void mptcp_pm_nl_work(struct mptcp_sock *msk);
721 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
722 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
723 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
724 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
725 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
726 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
728 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
730 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
733 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
735 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
737 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
740 static inline bool mptcp_check_fallback(const struct sock *sk)
742 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
743 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
745 return __mptcp_check_fallback(msk);
748 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
750 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
751 pr_debug("TCP fallback already done (msk=%p)", msk);
754 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
757 static inline void mptcp_do_fallback(struct sock *sk)
759 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
760 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
762 __mptcp_do_fallback(msk);
765 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
767 static inline bool subflow_simultaneous_connect(struct sock *sk)
769 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
770 struct sock *parent = subflow->conn;
772 return sk->sk_state == TCP_ESTABLISHED &&
773 !mptcp_sk(parent)->pm.server_side &&
774 !subflow->conn_finished;
777 #ifdef CONFIG_SYN_COOKIES
778 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
779 struct sk_buff *skb);
780 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
781 struct sk_buff *skb);
782 void __init mptcp_join_cookie_init(void);
785 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
786 struct sk_buff *skb) {}
788 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
794 static inline void mptcp_join_cookie_init(void) {}
797 #endif /* __MPTCP_PROTOCOL_H */