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)
29 #define OPTION_MPTCP_DSS BIT(11)
30 #define OPTION_MPTCP_FAIL BIT(12)
32 #define OPTION_MPTCP_CSUMREQD BIT(13)
34 #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
36 #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
39 /* MPTCP option subtypes */
40 #define MPTCPOPT_MP_CAPABLE 0
41 #define MPTCPOPT_MP_JOIN 1
42 #define MPTCPOPT_DSS 2
43 #define MPTCPOPT_ADD_ADDR 3
44 #define MPTCPOPT_RM_ADDR 4
45 #define MPTCPOPT_MP_PRIO 5
46 #define MPTCPOPT_MP_FAIL 6
47 #define MPTCPOPT_MP_FASTCLOSE 7
48 #define MPTCPOPT_RST 8
50 /* MPTCP suboption lengths */
51 #define TCPOLEN_MPTCP_MPC_SYN 4
52 #define TCPOLEN_MPTCP_MPC_SYNACK 12
53 #define TCPOLEN_MPTCP_MPC_ACK 20
54 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
55 #define TCPOLEN_MPTCP_MPJ_SYN 12
56 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
57 #define TCPOLEN_MPTCP_MPJ_ACK 24
58 #define TCPOLEN_MPTCP_DSS_BASE 4
59 #define TCPOLEN_MPTCP_DSS_ACK32 4
60 #define TCPOLEN_MPTCP_DSS_ACK64 8
61 #define TCPOLEN_MPTCP_DSS_MAP32 10
62 #define TCPOLEN_MPTCP_DSS_MAP64 14
63 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
64 #define TCPOLEN_MPTCP_ADD_ADDR 16
65 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
66 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
67 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
68 #define TCPOLEN_MPTCP_ADD_ADDR6 28
69 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
70 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
71 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
72 #define TCPOLEN_MPTCP_PORT_LEN 2
73 #define TCPOLEN_MPTCP_PORT_ALIGN 2
74 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3
75 #define TCPOLEN_MPTCP_PRIO 3
76 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
77 #define TCPOLEN_MPTCP_FASTCLOSE 12
78 #define TCPOLEN_MPTCP_RST 4
79 #define TCPOLEN_MPTCP_FAIL 12
81 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
83 /* MPTCP MP_JOIN flags */
84 #define MPTCPOPT_BACKUP BIT(0)
85 #define MPTCPOPT_HMAC_LEN 20
86 #define MPTCPOPT_THMAC_LEN 8
88 /* MPTCP MP_CAPABLE flags */
89 #define MPTCP_VERSION_MASK (0x0F)
90 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
91 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
92 #define MPTCP_CAP_DENY_JOIN_ID0 BIT(5)
93 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
94 #define MPTCP_CAP_FLAG_MASK (0x1F)
97 #define MPTCP_DSS_DATA_FIN BIT(4)
98 #define MPTCP_DSS_DSN64 BIT(3)
99 #define MPTCP_DSS_HAS_MAP BIT(2)
100 #define MPTCP_DSS_ACK64 BIT(1)
101 #define MPTCP_DSS_HAS_ACK BIT(0)
102 #define MPTCP_DSS_FLAG_MASK (0x1F)
104 /* MPTCP ADD_ADDR flags */
105 #define MPTCP_ADDR_ECHO BIT(0)
107 /* MPTCP MP_PRIO flags */
108 #define MPTCP_PRIO_BKUP BIT(0)
110 /* MPTCP TCPRST flags */
111 #define MPTCP_RST_TRANSIENT BIT(0)
113 /* MPTCP socket flags */
114 #define MPTCP_NOSPACE 1
115 #define MPTCP_WORK_RTX 2
116 #define MPTCP_WORK_EOF 3
117 #define MPTCP_FALLBACK_DONE 4
118 #define MPTCP_WORK_CLOSE_SUBFLOW 5
119 #define MPTCP_PUSH_PENDING 6
120 #define MPTCP_CLEAN_UNA 7
121 #define MPTCP_ERROR_REPORT 8
122 #define MPTCP_RETRANSMIT 9
123 #define MPTCP_WORK_SYNC_SETSOCKOPT 10
124 #define MPTCP_CONNECTED 11
126 static inline bool before64(__u64 seq1, __u64 seq2)
128 return (__s64)(seq1 - seq2) < 0;
131 #define after64(seq2, seq1) before64(seq1, seq2)
133 struct mptcp_options_received {
158 u8 hmac[MPTCPOPT_HMAC_LEN];
159 struct mptcp_addr_info addr;
160 struct mptcp_rm_list rm_list;
165 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
167 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
168 ((nib & 0xF) << 8) | field);
171 enum mptcp_pm_status {
172 MPTCP_PM_ADD_ADDR_RECEIVED,
173 MPTCP_PM_ADD_ADDR_SEND_ACK,
174 MPTCP_PM_RM_ADDR_RECEIVED,
175 MPTCP_PM_ESTABLISHED,
176 MPTCP_PM_SUBFLOW_ESTABLISHED,
177 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
178 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is
179 * accounted int id_avail_bitmap
183 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */
184 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1)
186 enum mptcp_addr_signal_status {
187 MPTCP_ADD_ADDR_SIGNAL,
189 MPTCP_RM_ADDR_SIGNAL,
192 /* max value of mptcp_addr_info.id */
193 #define MPTCP_PM_MAX_ADDR_ID U8_MAX
195 struct mptcp_pm_data {
196 struct mptcp_addr_info local;
197 struct mptcp_addr_info remote;
198 struct list_head anno_list;
200 spinlock_t lock; /*protects the whole PM data */
207 bool remote_deny_join_id0;
208 u8 add_addr_signaled;
209 u8 add_addr_accepted;
213 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
214 struct mptcp_rm_list rm_list_tx;
215 struct mptcp_rm_list rm_list_rx;
218 struct mptcp_data_frag {
219 struct list_head list;
228 /* MPTCP connection sock */
230 /* inet_connection_sock must be the first member */
231 struct inet_connection_sock sk;
238 u64 rcv_data_fin_seq;
240 struct sock *last_snd;
243 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq;
244 * recovery related fields are under data_lock
249 unsigned long timer_ival;
253 bool recovery; /* closing subflow write queue reinjected */
255 bool fully_established;
257 bool snd_data_fin_enable;
259 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
264 spinlock_t join_list_lock;
265 struct work_struct work;
266 struct sk_buff *ooo_last_skb;
267 struct rb_root out_of_order_queue;
268 struct sk_buff_head receive_queue;
269 struct list_head conn_list;
270 struct list_head rtx_queue;
271 struct mptcp_data_frag *first_pending;
272 struct list_head join_list;
273 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
275 struct mptcp_pm_data pm;
277 u32 space; /* bytes copied in last measurement window */
278 u32 copied; /* bytes copied in this measurement window */
279 u64 time; /* start time of measurement window */
280 u64 rtt_us; /* last maximum rtt of subflows */
284 char ca_name[TCP_CA_NAME_MAX];
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 /* the msk socket don't use the backlog, also account for the bulk
306 static inline int __mptcp_rmem(const struct sock *sk)
308 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
311 static inline int __mptcp_space(const struct sock *sk)
313 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
316 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
318 const struct mptcp_sock *msk = mptcp_sk(sk);
320 return READ_ONCE(msk->first_pending);
323 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
325 struct mptcp_sock *msk = mptcp_sk(sk);
326 struct mptcp_data_frag *cur;
328 cur = msk->first_pending;
329 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
330 list_next_entry(cur, list);
333 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
335 struct mptcp_sock *msk = mptcp_sk(sk);
337 if (!msk->first_pending)
340 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
343 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
346 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
348 struct mptcp_sock *msk = mptcp_sk(sk);
350 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
353 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
356 struct csum_pseudo_header {
363 struct mptcp_subflow_request_sock {
364 struct tcp_request_sock sk;
379 struct mptcp_sock *msk;
380 struct hlist_nulls_node token_node;
383 static inline struct mptcp_subflow_request_sock *
384 mptcp_subflow_rsk(const struct request_sock *rsk)
386 return (struct mptcp_subflow_request_sock *)rsk;
389 enum mptcp_data_avail {
390 MPTCP_SUBFLOW_NODATA,
391 MPTCP_SUBFLOW_DATA_AVAIL,
394 struct mptcp_delegated_action {
395 struct napi_struct napi;
396 struct list_head head;
399 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
401 #define MPTCP_DELEGATE_SEND 0
402 #define MPTCP_DELEGATE_ACK 1
404 /* MPTCP subflow context */
405 struct mptcp_subflow_context {
406 struct list_head node;/* conn_list of subflows */
410 unsigned long avg_pacing_rate; /* protected by msk socket lock */
421 __wsum map_data_csum;
423 u32 request_mptcp : 1, /* send MP_CAPABLE */
424 request_join : 1, /* send MP_JOIN */
426 mp_capable : 1, /* remote is MPTCP capable */
427 mp_join : 1, /* remote is JOINing */
428 fully_established : 1, /* path validated */
429 pm_notified : 1, /* PM hook called for established status */
440 can_ack : 1, /* only after processing the remote a key */
441 disposable : 1, /* ctx can be free at ulp release time */
442 stale : 1; /* unable to snd/rcv data, do not use for xmit */
443 enum mptcp_data_avail data_avail;
448 u8 hmac[MPTCPOPT_HMAC_LEN];
452 u8 reset_transient:1;
456 long delegated_status;
460 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
463 u32 stale_rcv_tstamp;
465 struct sock *tcp_sock; /* tcp sk backpointer */
466 struct sock *conn; /* parent mptcp_sock */
467 const struct inet_connection_sock_af_ops *icsk_af_ops;
468 void (*tcp_data_ready)(struct sock *sk);
469 void (*tcp_state_change)(struct sock *sk);
470 void (*tcp_write_space)(struct sock *sk);
471 void (*tcp_error_report)(struct sock *sk);
476 static inline struct mptcp_subflow_context *
477 mptcp_subflow_ctx(const struct sock *sk)
479 struct inet_connection_sock *icsk = inet_csk(sk);
481 /* Use RCU on icsk_ulp_data only for sock diag code */
482 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
485 static inline struct sock *
486 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
488 return subflow->tcp_sock;
492 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
494 memset(subflow->reset_start, 0, subflow->reset_end - subflow->reset_start);
495 subflow->request_mptcp = 1;
499 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
501 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
502 subflow->ssn_offset -
503 subflow->map_subflow_seq;
507 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
509 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
512 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
513 struct mptcp_subflow_context *subflow)
515 sock_hold(mptcp_subflow_tcp_sock(subflow));
516 spin_lock_bh(&msk->join_list_lock);
517 list_add_tail(&subflow->node, &msk->join_list);
518 spin_unlock_bh(&msk->join_list_lock);
521 void mptcp_subflow_process_delegated(struct sock *ssk);
523 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
525 struct mptcp_delegated_action *delegated;
528 /* the caller held the subflow bh socket lock */
529 lockdep_assert_in_softirq();
531 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
532 * ensures the below list check sees list updates done prior to status
535 if (!test_and_set_bit(action, &subflow->delegated_status)) {
536 /* still on delegated list from previous scheduling */
537 if (!list_empty(&subflow->delegated_node))
540 delegated = this_cpu_ptr(&mptcp_delegated_actions);
541 schedule = list_empty(&delegated->head);
542 list_add_tail(&subflow->delegated_node, &delegated->head);
543 sock_hold(mptcp_subflow_tcp_sock(subflow));
545 napi_schedule(&delegated->napi);
549 static inline struct mptcp_subflow_context *
550 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
552 struct mptcp_subflow_context *ret;
554 if (list_empty(&delegated->head))
557 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
558 list_del_init(&ret->delegated_node);
562 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
564 return !!READ_ONCE(subflow->delegated_status);
567 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action)
569 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
570 * touching the status bit
573 clear_bit(action, &subflow->delegated_status);
576 int mptcp_is_enabled(const struct net *net);
577 unsigned int mptcp_get_add_addr_timeout(const struct net *net);
578 int mptcp_is_checksum_enabled(const struct net *net);
579 int mptcp_allow_join_id0(const struct net *net);
580 unsigned int mptcp_stale_loss_cnt(const struct net *net);
581 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
582 struct mptcp_options_received *mp_opt);
583 bool __mptcp_retransmit_pending_data(struct sock *sk);
584 void mptcp_check_and_set_pending(struct sock *sk);
585 void __mptcp_push_pending(struct sock *sk, unsigned int flags);
586 bool mptcp_subflow_data_available(struct sock *sk);
587 void __init mptcp_subflow_init(void);
588 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
589 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
590 struct mptcp_subflow_context *subflow);
591 void mptcp_subflow_send_ack(struct sock *ssk);
592 void mptcp_subflow_reset(struct sock *ssk);
593 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
594 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
596 /* called with sk socket lock held */
597 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
598 const struct mptcp_addr_info *remote);
599 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
600 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
601 struct sockaddr_storage *addr,
602 unsigned short family);
604 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
606 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
608 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
609 if (subflow->request_join && !subflow->fully_established)
612 /* only send if our side has not closed yet */
613 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
616 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
618 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
620 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
621 struct mptcp_subflow_context *ctx)
623 sk->sk_data_ready = ctx->tcp_data_ready;
624 sk->sk_state_change = ctx->tcp_state_change;
625 sk->sk_write_space = ctx->tcp_write_space;
626 sk->sk_error_report = ctx->tcp_error_report;
628 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
631 static inline bool mptcp_has_another_subflow(struct sock *ssk)
633 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk), *tmp;
634 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
636 mptcp_for_each_subflow(msk, tmp) {
644 void __init mptcp_proto_init(void);
645 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
646 int __init mptcp_proto_v6_init(void);
649 struct sock *mptcp_sk_clone(const struct sock *sk,
650 const struct mptcp_options_received *mp_opt,
651 struct request_sock *req);
652 void mptcp_get_options(const struct sock *sk,
653 const struct sk_buff *skb,
654 struct mptcp_options_received *mp_opt);
656 void mptcp_finish_connect(struct sock *sk);
657 void __mptcp_set_connected(struct sock *sk);
658 static inline bool mptcp_is_fully_established(struct sock *sk)
660 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
661 READ_ONCE(mptcp_sk(sk)->fully_established);
663 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
664 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
665 bool mptcp_finish_join(struct sock *sk);
666 bool mptcp_schedule_work(struct sock *sk);
667 int mptcp_setsockopt(struct sock *sk, int level, int optname,
668 sockptr_t optval, unsigned int optlen);
669 int mptcp_getsockopt(struct sock *sk, int level, int optname,
670 char __user *optval, int __user *option);
672 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
673 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
678 return __mptcp_expand_seq(old_seq, cur_seq);
680 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
681 void __mptcp_data_acked(struct sock *sk);
682 void __mptcp_error_report(struct sock *sk);
683 void mptcp_subflow_eof(struct sock *sk);
684 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
685 void __mptcp_flush_join_list(struct mptcp_sock *msk);
686 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
688 return READ_ONCE(msk->snd_data_fin_enable) &&
689 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
692 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
694 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
697 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
701 static inline void mptcp_write_space(struct sock *sk)
703 if (sk_stream_is_writeable(sk)) {
704 /* pairs with memory barrier in mptcp_poll */
706 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
707 sk_stream_write_space(sk);
711 void mptcp_destroy_common(struct mptcp_sock *msk);
713 #define MPTCP_TOKEN_MAX_RETRIES 4
715 void __init mptcp_token_init(void);
716 static inline void mptcp_token_init_request(struct request_sock *req)
718 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
721 int mptcp_token_new_request(struct request_sock *req);
722 void mptcp_token_destroy_request(struct request_sock *req);
723 int mptcp_token_new_connect(struct sock *sk);
724 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
725 struct mptcp_sock *msk);
726 bool mptcp_token_exists(u32 token);
727 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
728 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
730 void mptcp_token_destroy(struct mptcp_sock *msk);
732 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
734 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
736 void __init mptcp_pm_init(void);
737 void mptcp_pm_data_init(struct mptcp_sock *msk);
738 void mptcp_pm_data_reset(struct mptcp_sock *msk);
739 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
740 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
741 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
742 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
743 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
744 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
745 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
746 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
747 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
748 const struct mptcp_addr_info *addr);
749 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
750 struct mptcp_addr_info *addr);
751 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
752 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
753 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
754 const struct mptcp_rm_list *rm_list);
755 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
756 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
757 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
758 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
759 struct mptcp_pm_add_entry *
760 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
761 struct mptcp_addr_info *addr, bool check_id);
762 struct mptcp_pm_add_entry *
763 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
764 struct mptcp_addr_info *addr);
765 int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
766 u8 *flags, int *ifindex);
768 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
769 const struct mptcp_addr_info *addr,
771 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
772 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
774 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
775 const struct sock *ssk, gfp_t gfp);
776 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
777 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
779 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
781 return READ_ONCE(msk->pm.addr_signal) &
782 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
785 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
787 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
790 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
792 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
795 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
797 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
800 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
802 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
804 if (family == AF_INET6)
805 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
807 len += MPTCPOPT_THMAC_LEN;
808 /* account for 2 trailing 'nop' options */
810 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
815 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
817 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
820 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
823 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
824 unsigned int opt_size, unsigned int remaining,
825 struct mptcp_addr_info *addr, bool *echo,
826 bool *port, bool *drop_other_suboptions);
827 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
828 struct mptcp_rm_list *rm_list);
829 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
831 void __init mptcp_pm_nl_init(void);
832 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
833 void mptcp_pm_nl_work(struct mptcp_sock *msk);
834 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
835 const struct mptcp_rm_list *rm_list);
836 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
837 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
838 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
839 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
840 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
842 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
843 void mptcp_sockopt_sync_all(struct mptcp_sock *msk);
845 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
847 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
850 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
852 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
854 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
857 static inline bool mptcp_check_fallback(const struct sock *sk)
859 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
860 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
862 return __mptcp_check_fallback(msk);
865 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
867 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
868 pr_debug("TCP fallback already done (msk=%p)", msk);
871 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
874 static inline void mptcp_do_fallback(struct sock *sk)
876 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
877 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
879 __mptcp_do_fallback(msk);
882 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
884 static inline bool subflow_simultaneous_connect(struct sock *sk)
886 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
887 struct sock *parent = subflow->conn;
889 return sk->sk_state == TCP_ESTABLISHED &&
890 !mptcp_sk(parent)->pm.server_side &&
891 !subflow->conn_finished;
894 #ifdef CONFIG_SYN_COOKIES
895 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
896 struct sk_buff *skb);
897 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
898 struct sk_buff *skb);
899 void __init mptcp_join_cookie_init(void);
902 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
903 struct sk_buff *skb) {}
905 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
911 static inline void mptcp_join_cookie_init(void) {}
914 #endif /* __MPTCP_PROTOCOL_H */