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_RM_ADDR BIT(7)
26 #define OPTION_MPTCP_FASTCLOSE BIT(8)
27 #define OPTION_MPTCP_PRIO BIT(9)
28 #define OPTION_MPTCP_RST 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
39 #define MPTCPOPT_RST 8
41 /* MPTCP suboption lengths */
42 #define TCPOLEN_MPTCP_MPC_SYN 4
43 #define TCPOLEN_MPTCP_MPC_SYNACK 12
44 #define TCPOLEN_MPTCP_MPC_ACK 20
45 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
46 #define TCPOLEN_MPTCP_MPJ_SYN 12
47 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
48 #define TCPOLEN_MPTCP_MPJ_ACK 24
49 #define TCPOLEN_MPTCP_DSS_BASE 4
50 #define TCPOLEN_MPTCP_DSS_ACK32 4
51 #define TCPOLEN_MPTCP_DSS_ACK64 8
52 #define TCPOLEN_MPTCP_DSS_MAP32 10
53 #define TCPOLEN_MPTCP_DSS_MAP64 14
54 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
55 #define TCPOLEN_MPTCP_ADD_ADDR 16
56 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
57 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
58 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
59 #define TCPOLEN_MPTCP_ADD_ADDR6 28
60 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
61 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
62 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
63 #define TCPOLEN_MPTCP_PORT_LEN 2
64 #define TCPOLEN_MPTCP_PORT_ALIGN 2
65 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3
66 #define TCPOLEN_MPTCP_PRIO 3
67 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
68 #define TCPOLEN_MPTCP_FASTCLOSE 12
69 #define TCPOLEN_MPTCP_RST 4
71 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
73 /* MPTCP MP_JOIN flags */
74 #define MPTCPOPT_BACKUP BIT(0)
75 #define MPTCPOPT_HMAC_LEN 20
76 #define MPTCPOPT_THMAC_LEN 8
78 /* MPTCP MP_CAPABLE flags */
79 #define MPTCP_VERSION_MASK (0x0F)
80 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
81 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
82 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
83 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
84 #define MPTCP_CAP_FLAG_MASK (0x1F)
87 #define MPTCP_DSS_DATA_FIN BIT(4)
88 #define MPTCP_DSS_DSN64 BIT(3)
89 #define MPTCP_DSS_HAS_MAP BIT(2)
90 #define MPTCP_DSS_ACK64 BIT(1)
91 #define MPTCP_DSS_HAS_ACK BIT(0)
92 #define MPTCP_DSS_FLAG_MASK (0x1F)
94 /* MPTCP ADD_ADDR flags */
95 #define MPTCP_ADDR_ECHO BIT(0)
97 /* MPTCP MP_PRIO flags */
98 #define MPTCP_PRIO_BKUP BIT(0)
100 /* MPTCP TCPRST flags */
101 #define MPTCP_RST_TRANSIENT BIT(0)
103 /* MPTCP socket flags */
104 #define MPTCP_DATA_READY 0
105 #define MPTCP_NOSPACE 1
106 #define MPTCP_WORK_RTX 2
107 #define MPTCP_WORK_EOF 3
108 #define MPTCP_FALLBACK_DONE 4
109 #define MPTCP_WORK_CLOSE_SUBFLOW 5
110 #define MPTCP_PUSH_PENDING 6
111 #define MPTCP_CLEAN_UNA 7
112 #define MPTCP_ERROR_REPORT 8
113 #define MPTCP_RETRANSMIT 9
114 #define MPTCP_WORK_SYNC_SETSOCKOPT 10
115 #define MPTCP_CONNECTED 11
117 static inline bool before64(__u64 seq1, __u64 seq2)
119 return (__s64)(seq1 - seq2) < 0;
122 #define after64(seq2, seq1) before64(seq1, seq2)
124 struct mptcp_options_received {
147 u8 hmac[MPTCPOPT_HMAC_LEN];
156 struct mptcp_addr_info addr;
157 struct mptcp_rm_list rm_list;
160 u8 reset_transient:1;
163 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
165 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
166 ((nib & 0xF) << 8) | field);
169 enum mptcp_pm_status {
170 MPTCP_PM_ADD_ADDR_RECEIVED,
171 MPTCP_PM_ADD_ADDR_SEND_ACK,
172 MPTCP_PM_RM_ADDR_RECEIVED,
173 MPTCP_PM_ESTABLISHED,
174 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
175 MPTCP_PM_SUBFLOW_ESTABLISHED,
178 enum mptcp_addr_signal_status {
179 MPTCP_ADD_ADDR_SIGNAL,
183 MPTCP_RM_ADDR_SIGNAL,
186 struct mptcp_pm_data {
187 struct mptcp_addr_info local;
188 struct mptcp_addr_info remote;
189 struct list_head anno_list;
191 spinlock_t lock; /*protects the whole PM data */
198 bool remote_deny_join_id0;
199 u8 add_addr_signaled;
200 u8 add_addr_accepted;
204 struct mptcp_rm_list rm_list_tx;
205 struct mptcp_rm_list rm_list_rx;
208 struct mptcp_data_frag {
209 struct list_head list;
218 /* MPTCP connection sock */
220 /* inet_connection_sock must be the first member */
221 struct inet_connection_sock sk;
228 u64 rcv_data_fin_seq;
230 struct sock *last_snd;
235 unsigned long timer_ival;
240 bool fully_established;
242 bool snd_data_fin_enable;
244 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
246 spinlock_t join_list_lock;
247 struct work_struct work;
248 struct sk_buff *ooo_last_skb;
249 struct rb_root out_of_order_queue;
250 struct sk_buff_head receive_queue;
252 struct list_head conn_list;
253 struct list_head rtx_queue;
254 struct mptcp_data_frag *first_pending;
255 struct list_head join_list;
256 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
258 struct mptcp_pm_data pm;
260 u32 space; /* bytes copied in last measurement window */
261 u32 copied; /* bytes copied in this measurement window */
262 u64 time; /* start time of measurement window */
263 u64 rtt_us; /* last maximum rtt of subflows */
267 char ca_name[TCP_CA_NAME_MAX];
270 #define mptcp_lock_sock(___sk, cb) do { \
271 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
273 spin_lock_bh(&__sk->sk_lock.slock); \
274 if (__sk->sk_lock.owned) \
277 __sk->sk_lock.owned = 1; \
278 spin_unlock(&__sk->sk_lock.slock); \
279 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
283 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
284 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
286 #define mptcp_for_each_subflow(__msk, __subflow) \
287 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
289 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
291 sock_owned_by_me((const struct sock *)msk);
294 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
296 return (struct mptcp_sock *)sk;
299 /* the msk socket don't use the backlog, also account for the bulk
302 static inline int __mptcp_rmem(const struct sock *sk)
304 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
307 static inline int __mptcp_space(const struct sock *sk)
309 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
312 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
314 const struct mptcp_sock *msk = mptcp_sk(sk);
316 return READ_ONCE(msk->first_pending);
319 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
321 struct mptcp_sock *msk = mptcp_sk(sk);
322 struct mptcp_data_frag *cur;
324 cur = msk->first_pending;
325 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
326 list_next_entry(cur, list);
329 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
331 struct mptcp_sock *msk = mptcp_sk(sk);
333 if (!msk->first_pending)
336 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
339 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
342 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
344 struct mptcp_sock *msk = mptcp_sk(sk);
346 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
349 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
352 struct csum_pseudo_header {
359 struct mptcp_subflow_request_sock {
360 struct tcp_request_sock sk;
375 struct mptcp_sock *msk;
376 struct hlist_nulls_node token_node;
379 static inline struct mptcp_subflow_request_sock *
380 mptcp_subflow_rsk(const struct request_sock *rsk)
382 return (struct mptcp_subflow_request_sock *)rsk;
385 enum mptcp_data_avail {
386 MPTCP_SUBFLOW_NODATA,
387 MPTCP_SUBFLOW_DATA_AVAIL,
390 struct mptcp_delegated_action {
391 struct napi_struct napi;
392 struct list_head head;
395 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
397 #define MPTCP_DELEGATE_SEND 0
399 /* MPTCP subflow context */
400 struct mptcp_subflow_context {
401 struct list_head node;/* conn_list of subflows */
412 __wsum map_data_csum;
414 u32 request_mptcp : 1, /* send MP_CAPABLE */
415 request_join : 1, /* send MP_JOIN */
417 mp_capable : 1, /* remote is MPTCP capable */
418 mp_join : 1, /* remote is JOINing */
419 fully_established : 1, /* path validated */
420 pm_notified : 1, /* PM hook called for established status */
429 can_ack : 1, /* only after processing the remote a key */
430 disposable : 1; /* ctx can be free at ulp release time */
431 enum mptcp_data_avail data_avail;
436 u8 hmac[MPTCPOPT_HMAC_LEN];
440 u8 reset_transient:1;
443 long delegated_status;
444 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
448 struct sock *tcp_sock; /* tcp sk backpointer */
449 struct sock *conn; /* parent mptcp_sock */
450 const struct inet_connection_sock_af_ops *icsk_af_ops;
451 void (*tcp_data_ready)(struct sock *sk);
452 void (*tcp_state_change)(struct sock *sk);
453 void (*tcp_write_space)(struct sock *sk);
454 void (*tcp_error_report)(struct sock *sk);
459 static inline struct mptcp_subflow_context *
460 mptcp_subflow_ctx(const struct sock *sk)
462 struct inet_connection_sock *icsk = inet_csk(sk);
464 /* Use RCU on icsk_ulp_data only for sock diag code */
465 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
468 static inline struct sock *
469 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
471 return subflow->tcp_sock;
475 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
477 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
478 subflow->ssn_offset -
479 subflow->map_subflow_seq;
483 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
485 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
488 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
489 struct mptcp_subflow_context *subflow)
491 sock_hold(mptcp_subflow_tcp_sock(subflow));
492 spin_lock_bh(&msk->join_list_lock);
493 list_add_tail(&subflow->node, &msk->join_list);
494 spin_unlock_bh(&msk->join_list_lock);
497 void mptcp_subflow_process_delegated(struct sock *ssk);
499 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
501 struct mptcp_delegated_action *delegated;
504 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
505 * ensures the below list check sees list updates done prior to status
508 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
509 /* still on delegated list from previous scheduling */
510 if (!list_empty(&subflow->delegated_node))
513 /* the caller held the subflow bh socket lock */
514 lockdep_assert_in_softirq();
516 delegated = this_cpu_ptr(&mptcp_delegated_actions);
517 schedule = list_empty(&delegated->head);
518 list_add_tail(&subflow->delegated_node, &delegated->head);
519 sock_hold(mptcp_subflow_tcp_sock(subflow));
521 napi_schedule(&delegated->napi);
525 static inline struct mptcp_subflow_context *
526 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
528 struct mptcp_subflow_context *ret;
530 if (list_empty(&delegated->head))
533 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
534 list_del_init(&ret->delegated_node);
538 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
540 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
543 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
545 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
546 * touching the status bit
549 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
552 int mptcp_is_enabled(struct net *net);
553 unsigned int mptcp_get_add_addr_timeout(struct net *net);
554 int mptcp_is_checksum_enabled(struct net *net);
555 int mptcp_allow_join_id0(struct net *net);
556 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
557 struct mptcp_options_received *mp_opt);
558 bool mptcp_subflow_data_available(struct sock *sk);
559 void __init mptcp_subflow_init(void);
560 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
561 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
562 struct mptcp_subflow_context *subflow);
563 void mptcp_subflow_reset(struct sock *ssk);
564 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
565 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
567 /* called with sk socket lock held */
568 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
569 const struct mptcp_addr_info *remote,
570 u8 flags, int ifindex);
571 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
572 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
573 struct sockaddr_storage *addr,
574 unsigned short family);
576 static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow)
578 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
580 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
581 if (subflow->request_join && !subflow->fully_established)
584 /* only send if our side has not closed yet */
585 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
588 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
589 struct mptcp_subflow_context *ctx)
591 sk->sk_data_ready = ctx->tcp_data_ready;
592 sk->sk_state_change = ctx->tcp_state_change;
593 sk->sk_write_space = ctx->tcp_write_space;
594 sk->sk_error_report = ctx->tcp_error_report;
596 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
599 void __init mptcp_proto_init(void);
600 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
601 int __init mptcp_proto_v6_init(void);
604 struct sock *mptcp_sk_clone(const struct sock *sk,
605 const struct mptcp_options_received *mp_opt,
606 struct request_sock *req);
607 void mptcp_get_options(const struct sock *sk,
608 const struct sk_buff *skb,
609 struct mptcp_options_received *mp_opt);
611 void mptcp_finish_connect(struct sock *sk);
612 void __mptcp_set_connected(struct sock *sk);
613 static inline bool mptcp_is_fully_established(struct sock *sk)
615 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
616 READ_ONCE(mptcp_sk(sk)->fully_established);
618 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
619 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
620 bool mptcp_finish_join(struct sock *sk);
621 bool mptcp_schedule_work(struct sock *sk);
622 int mptcp_setsockopt(struct sock *sk, int level, int optname,
623 sockptr_t optval, unsigned int optlen);
624 int mptcp_getsockopt(struct sock *sk, int level, int optname,
625 char __user *optval, int __user *option);
627 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
628 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
633 return __mptcp_expand_seq(old_seq, cur_seq);
635 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
636 void __mptcp_data_acked(struct sock *sk);
637 void __mptcp_error_report(struct sock *sk);
638 void mptcp_subflow_eof(struct sock *sk);
639 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
640 void __mptcp_flush_join_list(struct mptcp_sock *msk);
641 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
643 return READ_ONCE(msk->snd_data_fin_enable) &&
644 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
647 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
649 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
652 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
656 static inline void mptcp_write_space(struct sock *sk)
658 if (sk_stream_is_writeable(sk)) {
659 /* pairs with memory barrier in mptcp_poll */
661 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
662 sk_stream_write_space(sk);
666 void mptcp_destroy_common(struct mptcp_sock *msk);
668 #define MPTCP_TOKEN_MAX_RETRIES 4
670 void __init mptcp_token_init(void);
671 static inline void mptcp_token_init_request(struct request_sock *req)
673 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
676 int mptcp_token_new_request(struct request_sock *req);
677 void mptcp_token_destroy_request(struct request_sock *req);
678 int mptcp_token_new_connect(struct sock *sk);
679 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
680 struct mptcp_sock *msk);
681 bool mptcp_token_exists(u32 token);
682 struct mptcp_sock *mptcp_token_get_sock(u32 token);
683 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
685 void mptcp_token_destroy(struct mptcp_sock *msk);
687 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
689 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
691 void __init mptcp_pm_init(void);
692 void mptcp_pm_data_init(struct mptcp_sock *msk);
693 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
694 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
695 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
696 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
697 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
698 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
699 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
700 const struct mptcp_addr_info *addr);
701 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
702 struct mptcp_addr_info *addr);
703 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
704 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
705 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
706 const struct mptcp_rm_list *rm_list);
707 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
708 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
709 struct mptcp_addr_info *addr,
711 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
712 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
713 struct mptcp_pm_add_entry *
714 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
715 struct mptcp_addr_info *addr, bool check_id);
716 struct mptcp_pm_add_entry *
717 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
718 struct mptcp_addr_info *addr);
720 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
721 const struct mptcp_addr_info *addr,
723 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
724 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
726 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
727 const struct sock *ssk, gfp_t gfp);
728 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
729 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
731 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
733 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
736 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
738 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
741 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
743 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
746 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
748 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
751 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
753 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
756 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
758 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
760 if (family == AF_INET6)
761 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
763 len += MPTCPOPT_THMAC_LEN;
764 /* account for 2 trailing 'nop' options */
766 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
771 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
773 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
776 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
779 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
780 struct mptcp_addr_info *saddr, bool *echo, bool *port);
781 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
782 struct mptcp_rm_list *rm_list);
783 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
785 void __init mptcp_pm_nl_init(void);
786 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
787 void mptcp_pm_nl_work(struct mptcp_sock *msk);
788 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
789 const struct mptcp_rm_list *rm_list);
790 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
791 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
792 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
793 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
794 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
796 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
797 void mptcp_sockopt_sync_all(struct mptcp_sock *msk);
799 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
801 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
804 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
806 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
808 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
811 static inline bool mptcp_check_fallback(const struct sock *sk)
813 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
814 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
816 return __mptcp_check_fallback(msk);
819 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
821 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
822 pr_debug("TCP fallback already done (msk=%p)", msk);
825 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
828 static inline void mptcp_do_fallback(struct sock *sk)
830 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
831 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
833 __mptcp_do_fallback(msk);
836 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
838 static inline bool subflow_simultaneous_connect(struct sock *sk)
840 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
841 struct sock *parent = subflow->conn;
843 return sk->sk_state == TCP_ESTABLISHED &&
844 !mptcp_sk(parent)->pm.server_side &&
845 !subflow->conn_finished;
848 #ifdef CONFIG_SYN_COOKIES
849 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
850 struct sk_buff *skb);
851 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
852 struct sk_buff *skb);
853 void __init mptcp_join_cookie_init(void);
856 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
857 struct sk_buff *skb) {}
859 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
865 static inline void mptcp_join_cookie_init(void) {}
868 #endif /* __MPTCP_PROTOCOL_H */