io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / net / mptcp / protocol.h
blobd67de793d363f6e041fd0aabffb7d35bf4930952
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Multipath TCP
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
7 #ifndef __MPTCP_PROTOCOL_H
8 #define __MPTCP_PROTOCOL_H
10 #include <linux/random.h>
11 #include <net/tcp.h>
12 #include <net/inet_connection_sock.h>
14 #define MPTCP_SUPPORTED_VERSION 1
16 /* MPTCP option bits */
17 #define OPTION_MPTCP_MPC_SYN BIT(0)
18 #define OPTION_MPTCP_MPC_SYNACK BIT(1)
19 #define OPTION_MPTCP_MPC_ACK BIT(2)
20 #define OPTION_MPTCP_MPJ_SYN BIT(3)
21 #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
22 #define OPTION_MPTCP_MPJ_ACK BIT(5)
23 #define OPTION_MPTCP_ADD_ADDR BIT(6)
24 #define OPTION_MPTCP_ADD_ADDR6 BIT(7)
25 #define OPTION_MPTCP_RM_ADDR BIT(8)
26 #define OPTION_MPTCP_FASTCLOSE BIT(9)
28 /* MPTCP option subtypes */
29 #define MPTCPOPT_MP_CAPABLE 0
30 #define MPTCPOPT_MP_JOIN 1
31 #define MPTCPOPT_DSS 2
32 #define MPTCPOPT_ADD_ADDR 3
33 #define MPTCPOPT_RM_ADDR 4
34 #define MPTCPOPT_MP_PRIO 5
35 #define MPTCPOPT_MP_FAIL 6
36 #define MPTCPOPT_MP_FASTCLOSE 7
38 /* MPTCP suboption lengths */
39 #define TCPOLEN_MPTCP_MPC_SYN 4
40 #define TCPOLEN_MPTCP_MPC_SYNACK 12
41 #define TCPOLEN_MPTCP_MPC_ACK 20
42 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
43 #define TCPOLEN_MPTCP_MPJ_SYN 12
44 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
45 #define TCPOLEN_MPTCP_MPJ_ACK 24
46 #define TCPOLEN_MPTCP_DSS_BASE 4
47 #define TCPOLEN_MPTCP_DSS_ACK32 4
48 #define TCPOLEN_MPTCP_DSS_ACK64 8
49 #define TCPOLEN_MPTCP_DSS_MAP32 10
50 #define TCPOLEN_MPTCP_DSS_MAP64 14
51 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
52 #define TCPOLEN_MPTCP_ADD_ADDR 16
53 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 20
54 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
55 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 12
56 #define TCPOLEN_MPTCP_ADD_ADDR6 28
57 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 32
58 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
59 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 24
60 #define TCPOLEN_MPTCP_PORT_LEN 4
61 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4
62 #define TCPOLEN_MPTCP_FASTCLOSE 12
64 /* MPTCP MP_JOIN flags */
65 #define MPTCPOPT_BACKUP BIT(0)
66 #define MPTCPOPT_HMAC_LEN 20
67 #define MPTCPOPT_THMAC_LEN 8
69 /* MPTCP MP_CAPABLE flags */
70 #define MPTCP_VERSION_MASK (0x0F)
71 #define MPTCP_CAP_CHECKSUM_REQD BIT(7)
72 #define MPTCP_CAP_EXTENSIBILITY BIT(6)
73 #define MPTCP_CAP_HMAC_SHA256 BIT(0)
74 #define MPTCP_CAP_FLAG_MASK (0x3F)
76 /* MPTCP DSS flags */
77 #define MPTCP_DSS_DATA_FIN BIT(4)
78 #define MPTCP_DSS_DSN64 BIT(3)
79 #define MPTCP_DSS_HAS_MAP BIT(2)
80 #define MPTCP_DSS_ACK64 BIT(1)
81 #define MPTCP_DSS_HAS_ACK BIT(0)
82 #define MPTCP_DSS_FLAG_MASK (0x1F)
84 /* MPTCP ADD_ADDR flags */
85 #define MPTCP_ADDR_ECHO BIT(0)
86 #define MPTCP_ADDR_IPVERSION_4 4
87 #define MPTCP_ADDR_IPVERSION_6 6
89 /* MPTCP socket flags */
90 #define MPTCP_DATA_READY 0
91 #define MPTCP_NOSPACE 1
92 #define MPTCP_WORK_RTX 2
93 #define MPTCP_WORK_EOF 3
94 #define MPTCP_FALLBACK_DONE 4
95 #define MPTCP_WORK_CLOSE_SUBFLOW 5
96 #define MPTCP_PUSH_PENDING 6
97 #define MPTCP_CLEAN_UNA 7
99 static inline bool before64(__u64 seq1, __u64 seq2)
101 return (__s64)(seq1 - seq2) < 0;
104 #define after64(seq2, seq1) before64(seq1, seq2)
106 struct mptcp_options_received {
107 u64 sndr_key;
108 u64 rcvr_key;
109 u64 data_ack;
110 u64 data_seq;
111 u32 subflow_seq;
112 u16 data_len;
113 u16 mp_capable : 1,
114 mp_join : 1,
115 fastclose : 1,
116 dss : 1,
117 add_addr : 1,
118 rm_addr : 1,
119 family : 4,
120 echo : 1,
121 backup : 1;
122 u32 token;
123 u32 nonce;
124 u64 thmac;
125 u8 hmac[MPTCPOPT_HMAC_LEN];
126 u8 join_id;
127 u8 use_map:1,
128 dsn64:1,
129 data_fin:1,
130 use_ack:1,
131 ack64:1,
132 mpc_map:1,
133 __unused:2;
134 u8 addr_id;
135 u8 rm_id;
136 union {
137 struct in_addr addr;
138 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
139 struct in6_addr addr6;
140 #endif
142 u64 ahmac;
143 u16 port;
146 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
148 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
149 ((nib & 0xF) << 8) | field);
152 struct mptcp_addr_info {
153 sa_family_t family;
154 __be16 port;
155 u8 id;
156 u8 flags;
157 int ifindex;
158 union {
159 struct in_addr addr;
160 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
161 struct in6_addr addr6;
162 #endif
166 enum mptcp_pm_status {
167 MPTCP_PM_ADD_ADDR_RECEIVED,
168 MPTCP_PM_ADD_ADDR_SEND_ACK,
169 MPTCP_PM_RM_ADDR_RECEIVED,
170 MPTCP_PM_ESTABLISHED,
171 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
172 MPTCP_PM_SUBFLOW_ESTABLISHED,
175 enum mptcp_addr_signal_status {
176 MPTCP_ADD_ADDR_SIGNAL,
177 MPTCP_ADD_ADDR_ECHO,
178 MPTCP_ADD_ADDR_IPV6,
179 MPTCP_ADD_ADDR_PORT,
180 MPTCP_RM_ADDR_SIGNAL,
183 struct mptcp_pm_data {
184 struct mptcp_addr_info local;
185 struct mptcp_addr_info remote;
186 struct list_head anno_list;
188 spinlock_t lock; /*protects the whole PM data */
190 u8 addr_signal;
191 bool server_side;
192 bool work_pending;
193 bool accept_addr;
194 bool accept_subflow;
195 u8 add_addr_signaled;
196 u8 add_addr_accepted;
197 u8 local_addr_used;
198 u8 subflows;
199 u8 add_addr_signal_max;
200 u8 add_addr_accept_max;
201 u8 local_addr_max;
202 u8 subflows_max;
203 u8 status;
204 u8 rm_id;
207 struct mptcp_data_frag {
208 struct list_head list;
209 u64 data_seq;
210 u16 data_len;
211 u16 offset;
212 u16 overhead;
213 u16 already_sent;
214 struct page *page;
217 /* MPTCP connection sock */
218 struct mptcp_sock {
219 /* inet_connection_sock must be the first member */
220 struct inet_connection_sock sk;
221 u64 local_key;
222 u64 remote_key;
223 u64 write_seq;
224 u64 snd_nxt;
225 u64 ack_seq;
226 u64 rcv_wnd_sent;
227 u64 rcv_data_fin_seq;
228 int wmem_reserved;
229 struct sock *last_snd;
230 int snd_burst;
231 int old_wspace;
232 u64 snd_una;
233 u64 wnd_end;
234 unsigned long timer_ival;
235 u32 token;
236 int rmem_pending;
237 int rmem_released;
238 unsigned long flags;
239 bool can_ack;
240 bool fully_established;
241 bool rcv_data_fin;
242 bool snd_data_fin_enable;
243 bool rcv_fastclose;
244 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
245 spinlock_t join_list_lock;
246 struct sock *ack_hint;
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;
251 struct sk_buff_head skb_tx_cache; /* this is wmem accounted */
252 int tx_pending_data;
253 int size_goal_cache;
254 struct list_head conn_list;
255 struct list_head rtx_queue;
256 struct mptcp_data_frag *first_pending;
257 struct list_head join_list;
258 struct socket *subflow; /* outgoing connect/listener/!mp_capable */
259 struct sock *first;
260 struct mptcp_pm_data pm;
261 struct {
262 u32 space; /* bytes copied in last measurement window */
263 u32 copied; /* bytes copied in this measurement window */
264 u64 time; /* start time of measurement window */
265 u64 rtt_us; /* last maximum rtt of subflows */
266 } rcvq_space;
269 #define mptcp_lock_sock(___sk, cb) do { \
270 struct sock *__sk = (___sk); /* silence macro reuse warning */ \
271 might_sleep(); \
272 spin_lock_bh(&__sk->sk_lock.slock); \
273 if (__sk->sk_lock.owned) \
274 __lock_sock(__sk); \
275 cb; \
276 __sk->sk_lock.owned = 1; \
277 spin_unlock(&__sk->sk_lock.slock); \
278 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
279 local_bh_enable(); \
280 } while (0)
282 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
283 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
285 #define mptcp_for_each_subflow(__msk, __subflow) \
286 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
288 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
290 return (struct mptcp_sock *)sk;
293 static inline int __mptcp_space(const struct sock *sk)
295 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_pending);
298 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
300 const struct mptcp_sock *msk = mptcp_sk(sk);
302 return READ_ONCE(msk->first_pending);
305 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
307 struct mptcp_sock *msk = mptcp_sk(sk);
308 struct mptcp_data_frag *cur;
310 cur = msk->first_pending;
311 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
312 list_next_entry(cur, list);
315 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
317 struct mptcp_sock *msk = mptcp_sk(sk);
319 if (!msk->first_pending)
320 return NULL;
322 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
323 return NULL;
325 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
328 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk)
330 struct mptcp_sock *msk = mptcp_sk(sk);
332 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una)))
333 return NULL;
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 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
345 struct mptcp_subflow_request_sock {
346 struct tcp_request_sock sk;
347 u16 mp_capable : 1,
348 mp_join : 1,
349 backup : 1;
350 u8 local_id;
351 u8 remote_id;
352 u64 local_key;
353 u64 idsn;
354 u32 token;
355 u32 ssn_offset;
356 u64 thmac;
357 u32 local_nonce;
358 u32 remote_nonce;
359 struct mptcp_sock *msk;
360 struct hlist_nulls_node token_node;
363 static inline struct mptcp_subflow_request_sock *
364 mptcp_subflow_rsk(const struct request_sock *rsk)
366 return (struct mptcp_subflow_request_sock *)rsk;
369 enum mptcp_data_avail {
370 MPTCP_SUBFLOW_NODATA,
371 MPTCP_SUBFLOW_DATA_AVAIL,
372 MPTCP_SUBFLOW_OOO_DATA
375 /* MPTCP subflow context */
376 struct mptcp_subflow_context {
377 struct list_head node;/* conn_list of subflows */
378 u64 local_key;
379 u64 remote_key;
380 u64 idsn;
381 u64 map_seq;
382 u32 snd_isn;
383 u32 token;
384 u32 rel_write_seq;
385 u32 map_subflow_seq;
386 u32 ssn_offset;
387 u32 map_data_len;
388 u32 request_mptcp : 1, /* send MP_CAPABLE */
389 request_join : 1, /* send MP_JOIN */
390 request_bkup : 1,
391 mp_capable : 1, /* remote is MPTCP capable */
392 mp_join : 1, /* remote is JOINing */
393 fully_established : 1, /* path validated */
394 pm_notified : 1, /* PM hook called for established status */
395 conn_finished : 1,
396 map_valid : 1,
397 mpc_map : 1,
398 backup : 1,
399 rx_eof : 1,
400 can_ack : 1, /* only after processing the remote a key */
401 disposable : 1; /* ctx can be free at ulp release time */
402 enum mptcp_data_avail data_avail;
403 u32 remote_nonce;
404 u64 thmac;
405 u32 local_nonce;
406 u32 remote_token;
407 u8 hmac[MPTCPOPT_HMAC_LEN];
408 u8 local_id;
409 u8 remote_id;
411 struct sock *tcp_sock; /* tcp sk backpointer */
412 struct sock *conn; /* parent mptcp_sock */
413 const struct inet_connection_sock_af_ops *icsk_af_ops;
414 void (*tcp_data_ready)(struct sock *sk);
415 void (*tcp_state_change)(struct sock *sk);
416 void (*tcp_write_space)(struct sock *sk);
418 struct rcu_head rcu;
421 static inline struct mptcp_subflow_context *
422 mptcp_subflow_ctx(const struct sock *sk)
424 struct inet_connection_sock *icsk = inet_csk(sk);
426 /* Use RCU on icsk_ulp_data only for sock diag code */
427 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
430 static inline struct sock *
431 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
433 return subflow->tcp_sock;
436 static inline u64
437 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
439 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
440 subflow->ssn_offset -
441 subflow->map_subflow_seq;
444 static inline u64
445 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
447 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
450 static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
451 struct mptcp_subflow_context *subflow)
453 sock_hold(mptcp_subflow_tcp_sock(subflow));
454 spin_lock_bh(&msk->join_list_lock);
455 list_add_tail(&subflow->node, &msk->join_list);
456 spin_unlock_bh(&msk->join_list_lock);
459 int mptcp_is_enabled(struct net *net);
460 unsigned int mptcp_get_add_addr_timeout(struct net *net);
461 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
462 struct mptcp_options_received *mp_opt);
463 bool mptcp_subflow_data_available(struct sock *sk);
464 void __init mptcp_subflow_init(void);
465 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
466 void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
467 struct mptcp_subflow_context *subflow);
468 void mptcp_subflow_reset(struct sock *ssk);
470 /* called with sk socket lock held */
471 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
472 const struct mptcp_addr_info *remote);
473 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
475 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
476 struct mptcp_subflow_context *ctx)
478 sk->sk_data_ready = ctx->tcp_data_ready;
479 sk->sk_state_change = ctx->tcp_state_change;
480 sk->sk_write_space = ctx->tcp_write_space;
482 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
485 void __init mptcp_proto_init(void);
486 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
487 int __init mptcp_proto_v6_init(void);
488 #endif
490 struct sock *mptcp_sk_clone(const struct sock *sk,
491 const struct mptcp_options_received *mp_opt,
492 struct request_sock *req);
493 void mptcp_get_options(const struct sk_buff *skb,
494 struct mptcp_options_received *mp_opt);
496 void mptcp_finish_connect(struct sock *sk);
497 static inline bool mptcp_is_fully_established(struct sock *sk)
499 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
500 READ_ONCE(mptcp_sk(sk)->fully_established);
502 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
503 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
504 bool mptcp_finish_join(struct sock *sk);
505 bool mptcp_schedule_work(struct sock *sk);
506 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
507 void __mptcp_data_acked(struct sock *sk);
508 void mptcp_subflow_eof(struct sock *sk);
509 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
510 void __mptcp_flush_join_list(struct mptcp_sock *msk);
511 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
513 return READ_ONCE(msk->snd_data_fin_enable) &&
514 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
517 void mptcp_destroy_common(struct mptcp_sock *msk);
519 void __init mptcp_token_init(void);
520 static inline void mptcp_token_init_request(struct request_sock *req)
522 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
525 int mptcp_token_new_request(struct request_sock *req);
526 void mptcp_token_destroy_request(struct request_sock *req);
527 int mptcp_token_new_connect(struct sock *sk);
528 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
529 struct mptcp_sock *msk);
530 bool mptcp_token_exists(u32 token);
531 struct mptcp_sock *mptcp_token_get_sock(u32 token);
532 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
533 long *s_num);
534 void mptcp_token_destroy(struct mptcp_sock *msk);
536 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
538 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
540 void __init mptcp_pm_init(void);
541 void mptcp_pm_data_init(struct mptcp_sock *msk);
542 void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
543 void mptcp_pm_fully_established(struct mptcp_sock *msk);
544 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
545 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
546 void mptcp_pm_subflow_established(struct mptcp_sock *msk,
547 struct mptcp_subflow_context *subflow);
548 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
549 void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
550 const struct mptcp_addr_info *addr);
551 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
552 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
553 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
554 struct mptcp_pm_add_entry *
555 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
556 struct mptcp_addr_info *addr);
558 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
559 const struct mptcp_addr_info *addr,
560 bool echo, bool port);
561 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
562 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
564 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
566 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
569 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
571 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
574 static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
576 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
579 static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
581 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
584 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
586 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
589 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
591 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
593 if (family == AF_INET6)
594 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
595 if (!echo)
596 len += MPTCPOPT_THMAC_LEN;
597 if (port)
598 len += TCPOLEN_MPTCP_PORT_LEN;
600 return len;
603 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
604 struct mptcp_addr_info *saddr, bool *echo, bool *port);
605 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
606 u8 *rm_id);
607 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
609 void __init mptcp_pm_nl_init(void);
610 void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
611 void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
612 void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
613 void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
614 void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk);
615 void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
616 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
617 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
619 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
621 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
624 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
626 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
628 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
631 static inline bool mptcp_check_fallback(const struct sock *sk)
633 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
634 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
636 return __mptcp_check_fallback(msk);
639 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
641 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
642 pr_debug("TCP fallback already done (msk=%p)", msk);
643 return;
645 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
648 static inline void mptcp_do_fallback(struct sock *sk)
650 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
651 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
653 __mptcp_do_fallback(msk);
656 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
658 static inline bool subflow_simultaneous_connect(struct sock *sk)
660 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
661 struct sock *parent = subflow->conn;
663 return sk->sk_state == TCP_ESTABLISHED &&
664 !mptcp_sk(parent)->pm.server_side &&
665 !subflow->conn_finished;
668 #ifdef CONFIG_SYN_COOKIES
669 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
670 struct sk_buff *skb);
671 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
672 struct sk_buff *skb);
673 void __init mptcp_join_cookie_init(void);
674 #else
675 static inline void
676 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
677 struct sk_buff *skb) {}
678 static inline bool
679 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
680 struct sk_buff *skb)
682 return false;
685 static inline void mptcp_join_cookie_init(void) {}
686 #endif
688 #endif /* __MPTCP_PROTOCOL_H */