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 /* MPTCP MP_JOIN flags */
72 #define MPTCPOPT_BACKUP BIT(0)
73 #define MPTCPOPT_HMAC_LEN 20
74 #define MPTCPOPT_THMAC_LEN 8
76 /* MPTCP MP_CAPABLE flags */
77 #define MPTCP_VERSION_MASK (0x0F)
78 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
79 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
80 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
81 #define MPTCP_CAP_FLAG_MASK (0x3F)
84 #define MPTCP_DSS_DATA_FIN BIT(4)
85 #define MPTCP_DSS_DSN64 BIT(3)
86 #define MPTCP_DSS_HAS_MAP BIT(2)
87 #define MPTCP_DSS_ACK64 BIT(1)
88 #define MPTCP_DSS_HAS_ACK BIT(0)
89 #define MPTCP_DSS_FLAG_MASK (0x1F)
91 /* MPTCP ADD_ADDR flags */
92 #define MPTCP_ADDR_ECHO BIT(0)
94 /* MPTCP MP_PRIO flags */
95 #define MPTCP_PRIO_BKUP BIT(0)
97 /* MPTCP TCPRST flags */
98 #define MPTCP_RST_TRANSIENT BIT(0)
100 /* MPTCP socket flags */
101 #define MPTCP_DATA_READY 0
102 #define MPTCP_NOSPACE 1
103 #define MPTCP_WORK_RTX 2
104 #define MPTCP_WORK_EOF 3
105 #define MPTCP_FALLBACK_DONE 4
106 #define MPTCP_WORK_CLOSE_SUBFLOW 5
107 #define MPTCP_PUSH_PENDING 6
108 #define MPTCP_CLEAN_UNA 7
109 #define MPTCP_ERROR_REPORT 8
110 #define MPTCP_RETRANSMIT 9
112 static inline bool before64(__u64 seq1, __u64 seq2)
114 return (__s64)(seq1 - seq2) < 0;
117 #define after64(seq2, seq1) before64(seq1, seq2)
119 struct mptcp_options_received {
139 u8 hmac[MPTCPOPT_HMAC_LEN];
148 struct mptcp_addr_info addr;
149 struct mptcp_rm_list rm_list;
152 u8 reset_transient:1;
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 enum mptcp_pm_status {
162 MPTCP_PM_ADD_ADDR_RECEIVED,
163 MPTCP_PM_ADD_ADDR_SEND_ACK,
164 MPTCP_PM_RM_ADDR_RECEIVED,
165 MPTCP_PM_ESTABLISHED,
166 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
167 MPTCP_PM_SUBFLOW_ESTABLISHED,
170 enum mptcp_addr_signal_status {
171 MPTCP_ADD_ADDR_SIGNAL,
175 MPTCP_RM_ADDR_SIGNAL,
178 struct mptcp_pm_data {
179 struct mptcp_addr_info local;
180 struct mptcp_addr_info remote;
181 struct list_head anno_list;
183 spinlock_t lock; /*protects the whole PM data */
190 u8 add_addr_signaled;
191 u8 add_addr_accepted;
195 struct mptcp_rm_list rm_list_tx;
196 struct mptcp_rm_list rm_list_rx;
199 struct mptcp_data_frag {
200 struct list_head list;
209 /* MPTCP connection sock */
211 /* inet_connection_sock must be the first member */
212 struct inet_connection_sock sk;
219 u64 rcv_data_fin_seq;
221 struct sock *last_snd;
226 unsigned long timer_ival;
231 bool fully_established;
233 bool snd_data_fin_enable;
235 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
236 spinlock_t join_list_lock;
237 struct sock *ack_hint;
238 struct work_struct work;
239 struct sk_buff *ooo_last_skb;
240 struct rb_root out_of_order_queue;
241 struct sk_buff_head receive_queue;
242 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */
245 struct list_head conn_list;
246 struct list_head rtx_queue;
247 struct mptcp_data_frag *first_pending;
248 struct list_head join_list;
249 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
251 struct mptcp_pm_data pm;
253 u32 space; /* bytes copied in last measurement window */
254 u32 copied; /* bytes copied in this measurement window */
255 u64 time; /* start time of measurement window */
256 u64 rtt_us; /* last maximum rtt of subflows */
260 #define mptcp_lock_sock(___sk, cb) do { \
261 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
263 spin_lock_bh(&__sk->sk_lock.slock); \
264 if (__sk->sk_lock.owned) \
267 __sk->sk_lock.owned = 1; \
268 spin_unlock(&__sk->sk_lock.slock); \
269 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
273 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
274 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
276 #define mptcp_for_each_subflow(__msk, __subflow) \
277 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
279 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
281 sock_owned_by_me((const struct sock *)msk);
284 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
286 return (struct mptcp_sock *)sk;
289 static inline int __mptcp_space(const struct sock *sk)
291 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released);
294 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
296 const struct mptcp_sock *msk = mptcp_sk(sk);
298 return READ_ONCE(msk->first_pending);
301 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
303 struct mptcp_sock *msk = mptcp_sk(sk);
304 struct mptcp_data_frag *cur;
306 cur = msk->first_pending;
307 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
308 list_next_entry(cur, list);
311 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
313 struct mptcp_sock *msk = mptcp_sk(sk);
315 if (!msk->first_pending)
318 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
321 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
324 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
326 struct mptcp_sock *msk = mptcp_sk(sk);
328 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
331 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
334 struct mptcp_subflow_request_sock {
335 struct tcp_request_sock sk;
348 struct mptcp_sock *msk;
349 struct hlist_nulls_node token_node;
352 static inline struct mptcp_subflow_request_sock *
353 mptcp_subflow_rsk(const struct request_sock *rsk)
355 return (struct mptcp_subflow_request_sock *)rsk;
358 enum mptcp_data_avail {
359 MPTCP_SUBFLOW_NODATA,
360 MPTCP_SUBFLOW_DATA_AVAIL,
361 MPTCP_SUBFLOW_OOO_DATA
364 struct mptcp_delegated_action {
365 struct napi_struct napi;
366 struct list_head head;
369 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
371 #define MPTCP_DELEGATE_SEND 0
373 /* MPTCP subflow context */
374 struct mptcp_subflow_context {
375 struct list_head node;/* conn_list of subflows */
386 u32 request_mptcp : 1, /* send MP_CAPABLE */
387 request_join : 1, /* send MP_JOIN */
389 mp_capable : 1, /* remote is MPTCP capable */
390 mp_join : 1, /* remote is JOINing */
391 fully_established : 1, /* path validated */
392 pm_notified : 1, /* PM hook called for established status */
399 can_ack : 1, /* only after processing the remote a key */
400 disposable : 1; /* ctx can be free at ulp release time */
401 enum mptcp_data_avail data_avail;
406 u8 hmac[MPTCPOPT_HMAC_LEN];
410 u8 reset_transient:1;
413 long delegated_status;
414 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
416 struct sock *tcp_sock; /* tcp sk backpointer */
417 struct sock *conn; /* parent mptcp_sock */
418 const struct inet_connection_sock_af_ops *icsk_af_ops;
419 void (*tcp_data_ready)(struct sock *sk);
420 void (*tcp_state_change)(struct sock *sk);
421 void (*tcp_write_space)(struct sock *sk);
422 void (*tcp_error_report)(struct sock *sk);
427 static inline struct mptcp_subflow_context *
428 mptcp_subflow_ctx(const struct sock *sk)
430 struct inet_connection_sock *icsk = inet_csk(sk);
432 /* Use RCU on icsk_ulp_data only for sock diag code */
433 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
436 static inline struct sock *
437 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
439 return subflow->tcp_sock;
443 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
445 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
446 subflow->ssn_offset -
447 subflow->map_subflow_seq;
451 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
453 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
456 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
457 struct mptcp_subflow_context *subflow)
459 sock_hold(mptcp_subflow_tcp_sock(subflow));
460 spin_lock_bh(&msk->join_list_lock);
461 list_add_tail(&subflow->node, &msk->join_list);
462 spin_unlock_bh(&msk->join_list_lock);
465 void mptcp_subflow_process_delegated(struct sock *ssk);
467 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
469 struct mptcp_delegated_action *delegated;
472 /* The implied barrier pairs with mptcp_subflow_delegated_done(), and
473 * ensures the below list check sees list updates done prior to status
476 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
477 /* still on delegated list from previous scheduling */
478 if (!list_empty(&subflow->delegated_node))
481 /* the caller held the subflow bh socket lock */
482 lockdep_assert_in_softirq();
484 delegated = this_cpu_ptr(&mptcp_delegated_actions);
485 schedule = list_empty(&delegated->head);
486 list_add_tail(&subflow->delegated_node, &delegated->head);
487 sock_hold(mptcp_subflow_tcp_sock(subflow));
489 napi_schedule(&delegated->napi);
493 static inline struct mptcp_subflow_context *
494 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
496 struct mptcp_subflow_context *ret;
498 if (list_empty(&delegated->head))
501 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
502 list_del_init(&ret->delegated_node);
506 static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
508 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
511 static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
513 /* pairs with mptcp_subflow_delegate, ensures delegate_node is updated before
514 * touching the status bit
517 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
520 int mptcp_is_enabled(struct net *net);
521 unsigned int mptcp_get_add_addr_timeout(struct net *net);
522 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
523 struct mptcp_options_received *mp_opt);
524 bool mptcp_subflow_data_available(struct sock *sk);
525 void __init mptcp_subflow_init(void);
526 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
527 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
528 struct mptcp_subflow_context *subflow);
529 void mptcp_subflow_reset(struct sock *ssk);
530 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
531 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
533 /* called with sk socket lock held */
534 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
535 const struct mptcp_addr_info *remote,
536 u8 flags, int ifindex);
537 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
538 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
539 struct sockaddr_storage *addr,
540 unsigned short family);
542 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
543 struct mptcp_subflow_context *ctx)
545 sk->sk_data_ready = ctx->tcp_data_ready;
546 sk->sk_state_change = ctx->tcp_state_change;
547 sk->sk_write_space = ctx->tcp_write_space;
548 sk->sk_error_report = ctx->tcp_error_report;
550 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
553 void __init mptcp_proto_init(void);
554 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
555 int __init mptcp_proto_v6_init(void);
558 struct sock *mptcp_sk_clone(const struct sock *sk,
559 const struct mptcp_options_received *mp_opt,
560 struct request_sock *req);
561 void mptcp_get_options(const struct sk_buff *skb,
562 struct mptcp_options_received *mp_opt);
564 void mptcp_finish_connect(struct sock *sk);
565 static inline bool mptcp_is_fully_established(struct sock *sk)
567 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
568 READ_ONCE(mptcp_sk(sk)->fully_established);
570 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
571 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
572 bool mptcp_finish_join(struct sock *sk);
573 bool mptcp_schedule_work(struct sock *sk);
574 int mptcp_setsockopt(struct sock *sk, int level, int optname,
575 sockptr_t optval, unsigned int optlen);
576 int mptcp_getsockopt(struct sock *sk, int level, int optname,
577 char __user *optval, int __user *option);
579 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
580 void __mptcp_data_acked(struct sock *sk);
581 void __mptcp_error_report(struct sock *sk);
582 void mptcp_subflow_eof(struct sock *sk);
583 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
584 void __mptcp_flush_join_list(struct mptcp_sock *msk);
585 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
587 return READ_ONCE(msk->snd_data_fin_enable) &&
588 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
591 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
593 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
596 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
600 static inline void mptcp_write_space(struct sock *sk)
602 if (sk_stream_is_writeable(sk)) {
603 /* pairs with memory barrier in mptcp_poll */
605 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
606 sk_stream_write_space(sk);
610 void mptcp_destroy_common(struct mptcp_sock *msk);
612 void __init mptcp_token_init(void);
613 static inline void mptcp_token_init_request(struct request_sock *req)
615 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
618 int mptcp_token_new_request(struct request_sock *req);
619 void mptcp_token_destroy_request(struct request_sock *req);
620 int mptcp_token_new_connect(struct sock *sk);
621 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
622 struct mptcp_sock *msk);
623 bool mptcp_token_exists(u32 token);
624 struct mptcp_sock *mptcp_token_get_sock(u32 token);
625 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
627 void mptcp_token_destroy(struct mptcp_sock *msk);
629 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
631 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
633 void __init mptcp_pm_init(void);
634 void mptcp_pm_data_init(struct mptcp_sock *msk);
635 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
636 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
637 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
638 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
639 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
640 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
641 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
642 const struct mptcp_addr_info *addr);
643 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
644 struct mptcp_addr_info *addr);
645 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
646 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
647 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
648 const struct mptcp_rm_list *rm_list);
649 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
650 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
651 struct mptcp_addr_info *addr,
653 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
654 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
655 struct mptcp_pm_add_entry *
656 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
657 struct mptcp_addr_info *addr);
658 struct mptcp_pm_add_entry *
659 mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
660 struct mptcp_addr_info *addr);
662 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
663 const struct mptcp_addr_info *addr,
665 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
666 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
668 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
669 const struct sock *ssk, gfp_t gfp);
670 void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
671 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
673 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
675 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
678 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
680 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
683 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
685 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
688 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
690 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
693 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
695 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
698 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
700 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
702 if (family == AF_INET6)
703 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
705 len += MPTCPOPT_THMAC_LEN;
706 /* account for 2 trailing 'nop' options */
708 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
713 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
715 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
718 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
721 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
722 struct mptcp_addr_info *saddr, bool *echo, bool *port);
723 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
724 struct mptcp_rm_list *rm_list);
725 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
727 void __init mptcp_pm_nl_init(void);
728 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
729 void mptcp_pm_nl_work(struct mptcp_sock *msk);
730 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
731 const struct mptcp_rm_list *rm_list);
732 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
733 unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
734 unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
735 unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
736 unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
738 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
740 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
743 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
745 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
747 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
750 static inline bool mptcp_check_fallback(const struct sock *sk)
752 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
753 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
755 return __mptcp_check_fallback(msk);
758 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
760 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
761 pr_debug("TCP fallback already done (msk=%p)", msk);
764 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
767 static inline void mptcp_do_fallback(struct sock *sk)
769 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
770 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
772 __mptcp_do_fallback(msk);
775 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
777 static inline bool subflow_simultaneous_connect(struct sock *sk)
779 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
780 struct sock *parent = subflow->conn;
782 return sk->sk_state == TCP_ESTABLISHED &&
783 !mptcp_sk(parent)->pm.server_side &&
784 !subflow->conn_finished;
787 #ifdef CONFIG_SYN_COOKIES
788 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
789 struct sk_buff *skb);
790 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
791 struct sk_buff *skb);
792 void __init mptcp_join_cookie_init(void);
795 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
796 struct sk_buff *skb) {}
798 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
804 static inline void mptcp_join_cookie_init(void) {}
807 #endif /* __MPTCP_PROTOCOL_H */