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7#ifndef __MPTCP_PROTOCOL_H
8#define __MPTCP_PROTOCOL_H
9
10#include <linux/random.h>
11#include <net/tcp.h>
12#include <net/inet_connection_sock.h>
13#include <uapi/linux/mptcp.h>
14
15#define MPTCP_SUPPORTED_VERSION 1
16
17
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
30
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
40
41
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
70
71
72#define MPTCPOPT_BACKUP BIT(0)
73#define MPTCPOPT_HMAC_LEN 20
74#define MPTCPOPT_THMAC_LEN 8
75
76
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)
82
83
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)
90
91
92#define MPTCP_ADDR_ECHO BIT(0)
93
94
95#define MPTCP_PRIO_BKUP BIT(0)
96
97
98#define MPTCP_RST_TRANSIENT BIT(0)
99
100
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
111#define MPTCP_WORK_SYNC_SETSOCKOPT 10
112
113static inline bool before64(__u64 seq1, __u64 seq2)
114{
115 return (__s64)(seq1 - seq2) < 0;
116}
117
118#define after64(seq2, seq1) before64(seq1, seq2)
119
120struct mptcp_options_received {
121 u64 sndr_key;
122 u64 rcvr_key;
123 u64 data_ack;
124 u64 data_seq;
125 u32 subflow_seq;
126 u16 data_len;
127 u16 mp_capable : 1,
128 mp_join : 1,
129 fastclose : 1,
130 reset : 1,
131 dss : 1,
132 add_addr : 1,
133 rm_addr : 1,
134 mp_prio : 1,
135 echo : 1,
136 backup : 1;
137 u32 token;
138 u32 nonce;
139 u64 thmac;
140 u8 hmac[MPTCPOPT_HMAC_LEN];
141 u8 join_id;
142 u8 use_map:1,
143 dsn64:1,
144 data_fin:1,
145 use_ack:1,
146 ack64:1,
147 mpc_map:1,
148 __unused:2;
149 struct mptcp_addr_info addr;
150 struct mptcp_rm_list rm_list;
151 u64 ahmac;
152 u8 reset_reason:4;
153 u8 reset_transient:1;
154};
155
156static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
157{
158 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
159 ((nib & 0xF) << 8) | field);
160}
161
162enum mptcp_pm_status {
163 MPTCP_PM_ADD_ADDR_RECEIVED,
164 MPTCP_PM_ADD_ADDR_SEND_ACK,
165 MPTCP_PM_RM_ADDR_RECEIVED,
166 MPTCP_PM_ESTABLISHED,
167 MPTCP_PM_ALREADY_ESTABLISHED,
168 MPTCP_PM_SUBFLOW_ESTABLISHED,
169};
170
171enum mptcp_addr_signal_status {
172 MPTCP_ADD_ADDR_SIGNAL,
173 MPTCP_ADD_ADDR_ECHO,
174 MPTCP_ADD_ADDR_IPV6,
175 MPTCP_ADD_ADDR_PORT,
176 MPTCP_RM_ADDR_SIGNAL,
177};
178
179struct mptcp_pm_data {
180 struct mptcp_addr_info local;
181 struct mptcp_addr_info remote;
182 struct list_head anno_list;
183
184 spinlock_t lock;
185
186 u8 addr_signal;
187 bool server_side;
188 bool work_pending;
189 bool accept_addr;
190 bool accept_subflow;
191 u8 add_addr_signaled;
192 u8 add_addr_accepted;
193 u8 local_addr_used;
194 u8 subflows;
195 u8 status;
196 struct mptcp_rm_list rm_list_tx;
197 struct mptcp_rm_list rm_list_rx;
198};
199
200struct mptcp_data_frag {
201 struct list_head list;
202 u64 data_seq;
203 u16 data_len;
204 u16 offset;
205 u16 overhead;
206 u16 already_sent;
207 struct page *page;
208};
209
210
211struct mptcp_sock {
212
213 struct inet_connection_sock sk;
214 u64 local_key;
215 u64 remote_key;
216 u64 write_seq;
217 u64 snd_nxt;
218 u64 ack_seq;
219 u64 rcv_wnd_sent;
220 u64 rcv_data_fin_seq;
221 int wmem_reserved;
222 struct sock *last_snd;
223 int snd_burst;
224 int old_wspace;
225 u64 snd_una;
226 u64 wnd_end;
227 unsigned long timer_ival;
228 u32 token;
229 int rmem_released;
230 unsigned long flags;
231 bool can_ack;
232 bool fully_established;
233 bool rcv_data_fin;
234 bool snd_data_fin_enable;
235 bool rcv_fastclose;
236 bool use_64bit_ack;
237 spinlock_t join_list_lock;
238 struct sock *ack_hint;
239 struct work_struct work;
240 struct sk_buff *ooo_last_skb;
241 struct rb_root out_of_order_queue;
242 struct sk_buff_head receive_queue;
243 struct sk_buff_head skb_tx_cache;
244 int tx_pending_data;
245 int size_goal_cache;
246 struct list_head conn_list;
247 struct list_head rtx_queue;
248 struct mptcp_data_frag *first_pending;
249 struct list_head join_list;
250 struct socket *subflow;
251 struct sock *first;
252 struct mptcp_pm_data pm;
253 struct {
254 u32 space;
255 u32 copied;
256 u64 time;
257 u64 rtt_us;
258 } rcvq_space;
259
260 u32 setsockopt_seq;
261 char ca_name[TCP_CA_NAME_MAX];
262};
263
264#define mptcp_lock_sock(___sk, cb) do { \
265 struct sock *__sk = (___sk); \
266 might_sleep(); \
267 spin_lock_bh(&__sk->sk_lock.slock); \
268 if (__sk->sk_lock.owned) \
269 __lock_sock(__sk); \
270 cb; \
271 __sk->sk_lock.owned = 1; \
272 spin_unlock(&__sk->sk_lock.slock); \
273 mutex_acquire(&__sk->sk_lock.dep_map, 0, 0, _RET_IP_); \
274 local_bh_enable(); \
275} while (0)
276
277#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
278#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
279
280#define mptcp_for_each_subflow(__msk, __subflow) \
281 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
282
283static inline void msk_owned_by_me(const struct mptcp_sock *msk)
284{
285 sock_owned_by_me((const struct sock *)msk);
286}
287
288static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
289{
290 return (struct mptcp_sock *)sk;
291}
292
293static inline int __mptcp_space(const struct sock *sk)
294{
295 return tcp_space(sk) + READ_ONCE(mptcp_sk(sk)->rmem_released);
296}
297
298static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
299{
300 const struct mptcp_sock *msk = mptcp_sk(sk);
301
302 return READ_ONCE(msk->first_pending);
303}
304
305static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
306{
307 struct mptcp_sock *msk = mptcp_sk(sk);
308 struct mptcp_data_frag *cur;
309
310 cur = msk->first_pending;
311 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
312 list_next_entry(cur, list);
313}
314
315static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
316{
317 struct mptcp_sock *msk = mptcp_sk(sk);
318
319 if (!msk->first_pending)
320 return NULL;
321
322 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
323 return NULL;
324
325 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
326}
327
328static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
329{
330 struct mptcp_sock *msk = mptcp_sk(sk);
331
332 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
333 return NULL;
334
335 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
336}
337
338struct mptcp_subflow_request_sock {
339 struct tcp_request_sock sk;
340 u16 mp_capable : 1,
341 mp_join : 1,
342 backup : 1;
343 u8 local_id;
344 u8 remote_id;
345 u64 local_key;
346 u64 idsn;
347 u32 token;
348 u32 ssn_offset;
349 u64 thmac;
350 u32 local_nonce;
351 u32 remote_nonce;
352 struct mptcp_sock *msk;
353 struct hlist_nulls_node token_node;
354};
355
356static inline struct mptcp_subflow_request_sock *
357mptcp_subflow_rsk(const struct request_sock *rsk)
358{
359 return (struct mptcp_subflow_request_sock *)rsk;
360}
361
362enum mptcp_data_avail {
363 MPTCP_SUBFLOW_NODATA,
364 MPTCP_SUBFLOW_DATA_AVAIL,
365};
366
367struct mptcp_delegated_action {
368 struct napi_struct napi;
369 struct list_head head;
370};
371
372DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
373
374#define MPTCP_DELEGATE_SEND 0
375
376
377struct mptcp_subflow_context {
378 struct list_head node;
379 u64 local_key;
380 u64 remote_key;
381 u64 idsn;
382 u64 map_seq;
383 u32 snd_isn;
384 u32 token;
385 u32 rel_write_seq;
386 u32 map_subflow_seq;
387 u32 ssn_offset;
388 u32 map_data_len;
389 u32 request_mptcp : 1,
390 request_join : 1,
391 request_bkup : 1,
392 mp_capable : 1,
393 mp_join : 1,
394 fully_established : 1,
395 pm_notified : 1,
396 conn_finished : 1,
397 map_valid : 1,
398 mpc_map : 1,
399 backup : 1,
400 send_mp_prio : 1,
401 rx_eof : 1,
402 can_ack : 1,
403 disposable : 1;
404 enum mptcp_data_avail data_avail;
405 u32 remote_nonce;
406 u64 thmac;
407 u32 local_nonce;
408 u32 remote_token;
409 u8 hmac[MPTCPOPT_HMAC_LEN];
410 u8 local_id;
411 u8 remote_id;
412 u8 reset_seen:1;
413 u8 reset_transient:1;
414 u8 reset_reason:4;
415
416 long delegated_status;
417 struct list_head delegated_node;
418
419 u32 setsockopt_seq;
420
421 struct sock *tcp_sock;
422 struct sock *conn;
423 const struct inet_connection_sock_af_ops *icsk_af_ops;
424 void (*tcp_data_ready)(struct sock *sk);
425 void (*tcp_state_change)(struct sock *sk);
426 void (*tcp_write_space)(struct sock *sk);
427 void (*tcp_error_report)(struct sock *sk);
428
429 struct rcu_head rcu;
430};
431
432static inline struct mptcp_subflow_context *
433mptcp_subflow_ctx(const struct sock *sk)
434{
435 struct inet_connection_sock *icsk = inet_csk(sk);
436
437
438 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
439}
440
441static inline struct sock *
442mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
443{
444 return subflow->tcp_sock;
445}
446
447static inline u64
448mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
449{
450 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
451 subflow->ssn_offset -
452 subflow->map_subflow_seq;
453}
454
455static inline u64
456mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
457{
458 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
459}
460
461static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
462 struct mptcp_subflow_context *subflow)
463{
464 sock_hold(mptcp_subflow_tcp_sock(subflow));
465 spin_lock_bh(&msk->join_list_lock);
466 list_add_tail(&subflow->node, &msk->join_list);
467 spin_unlock_bh(&msk->join_list_lock);
468}
469
470void mptcp_subflow_process_delegated(struct sock *ssk);
471
472static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow)
473{
474 struct mptcp_delegated_action *delegated;
475 bool schedule;
476
477
478
479
480
481 if (!test_and_set_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status)) {
482
483 if (!list_empty(&subflow->delegated_node))
484 return;
485
486
487 lockdep_assert_in_softirq();
488
489 delegated = this_cpu_ptr(&mptcp_delegated_actions);
490 schedule = list_empty(&delegated->head);
491 list_add_tail(&subflow->delegated_node, &delegated->head);
492 sock_hold(mptcp_subflow_tcp_sock(subflow));
493 if (schedule)
494 napi_schedule(&delegated->napi);
495 }
496}
497
498static inline struct mptcp_subflow_context *
499mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
500{
501 struct mptcp_subflow_context *ret;
502
503 if (list_empty(&delegated->head))
504 return NULL;
505
506 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
507 list_del_init(&ret->delegated_node);
508 return ret;
509}
510
511static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
512{
513 return test_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
514}
515
516static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow)
517{
518
519
520
521 smp_wmb();
522 clear_bit(MPTCP_DELEGATE_SEND, &subflow->delegated_status);
523}
524
525int mptcp_is_enabled(struct net *net);
526unsigned int mptcp_get_add_addr_timeout(struct net *net);
527void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
528 struct mptcp_options_received *mp_opt);
529bool mptcp_subflow_data_available(struct sock *sk);
530void __init mptcp_subflow_init(void);
531void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
532void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
533 struct mptcp_subflow_context *subflow);
534void mptcp_subflow_reset(struct sock *ssk);
535void mptcp_sock_graft(struct sock *sk, struct socket *parent);
536struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
537
538
539int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
540 const struct mptcp_addr_info *remote,
541 u8 flags, int ifindex);
542int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
543void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
544 struct sockaddr_storage *addr,
545 unsigned short family);
546
547static inline bool mptcp_subflow_active(struct mptcp_subflow_context *subflow)
548{
549 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
550
551
552 if (subflow->request_join && !subflow->fully_established)
553 return false;
554
555
556 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
557}
558
559static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
560 struct mptcp_subflow_context *ctx)
561{
562 sk->sk_data_ready = ctx->tcp_data_ready;
563 sk->sk_state_change = ctx->tcp_state_change;
564 sk->sk_write_space = ctx->tcp_write_space;
565 sk->sk_error_report = ctx->tcp_error_report;
566
567 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
568}
569
570void __init mptcp_proto_init(void);
571#if IS_ENABLED(CONFIG_MPTCP_IPV6)
572int __init mptcp_proto_v6_init(void);
573#endif
574
575struct sock *mptcp_sk_clone(const struct sock *sk,
576 const struct mptcp_options_received *mp_opt,
577 struct request_sock *req);
578void mptcp_get_options(const struct sk_buff *skb,
579 struct mptcp_options_received *mp_opt);
580
581void mptcp_finish_connect(struct sock *sk);
582static inline bool mptcp_is_fully_established(struct sock *sk)
583{
584 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
585 READ_ONCE(mptcp_sk(sk)->fully_established);
586}
587void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
588void mptcp_data_ready(struct sock *sk, struct sock *ssk);
589bool mptcp_finish_join(struct sock *sk);
590bool mptcp_schedule_work(struct sock *sk);
591int mptcp_setsockopt(struct sock *sk, int level, int optname,
592 sockptr_t optval, unsigned int optlen);
593int mptcp_getsockopt(struct sock *sk, int level, int optname,
594 char __user *optval, int __user *option);
595
596void __mptcp_check_push(struct sock *sk, struct sock *ssk);
597void __mptcp_data_acked(struct sock *sk);
598void __mptcp_error_report(struct sock *sk);
599void mptcp_subflow_eof(struct sock *sk);
600bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
601void __mptcp_flush_join_list(struct mptcp_sock *msk);
602static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
603{
604 return READ_ONCE(msk->snd_data_fin_enable) &&
605 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
606}
607
608static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
609{
610 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
611 return false;
612
613 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
614 return true;
615}
616
617static inline void mptcp_write_space(struct sock *sk)
618{
619 if (sk_stream_is_writeable(sk)) {
620
621 smp_mb();
622 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
623 sk_stream_write_space(sk);
624 }
625}
626
627void mptcp_destroy_common(struct mptcp_sock *msk);
628
629void __init mptcp_token_init(void);
630static inline void mptcp_token_init_request(struct request_sock *req)
631{
632 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
633}
634
635int mptcp_token_new_request(struct request_sock *req);
636void mptcp_token_destroy_request(struct request_sock *req);
637int mptcp_token_new_connect(struct sock *sk);
638void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
639 struct mptcp_sock *msk);
640bool mptcp_token_exists(u32 token);
641struct mptcp_sock *mptcp_token_get_sock(u32 token);
642struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
643 long *s_num);
644void mptcp_token_destroy(struct mptcp_sock *msk);
645
646void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
647
648void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
649
650void __init mptcp_pm_init(void);
651void mptcp_pm_data_init(struct mptcp_sock *msk);
652void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
653void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
654bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
655void mptcp_pm_connection_closed(struct mptcp_sock *msk);
656void mptcp_pm_subflow_established(struct mptcp_sock *msk);
657void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
658void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
659 const struct mptcp_addr_info *addr);
660void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
661 struct mptcp_addr_info *addr);
662void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
663void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
664void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
665 const struct mptcp_rm_list *rm_list);
666void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
667int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
668 struct mptcp_addr_info *addr,
669 u8 bkup);
670void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
671bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
672struct mptcp_pm_add_entry *
673mptcp_pm_del_add_timer(struct mptcp_sock *msk,
674 struct mptcp_addr_info *addr, bool check_id);
675struct mptcp_pm_add_entry *
676mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
677 struct mptcp_addr_info *addr);
678
679int mptcp_pm_announce_addr(struct mptcp_sock *msk,
680 const struct mptcp_addr_info *addr,
681 bool echo);
682int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
683int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
684
685void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
686 const struct sock *ssk, gfp_t gfp);
687void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
688void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
689
690static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
691{
692 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
693}
694
695static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
696{
697 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
698}
699
700static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
701{
702 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
703}
704
705static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
706{
707 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
708}
709
710static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
711{
712 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
713}
714
715static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
716{
717 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
718
719 if (family == AF_INET6)
720 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
721 if (!echo)
722 len += MPTCPOPT_THMAC_LEN;
723
724 if (port)
725 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
726
727 return len;
728}
729
730static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
731{
732 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
733 return -EINVAL;
734
735 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
736}
737
738bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
739 struct mptcp_addr_info *saddr, bool *echo, bool *port);
740bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
741 struct mptcp_rm_list *rm_list);
742int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
743
744void __init mptcp_pm_nl_init(void);
745void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
746void mptcp_pm_nl_work(struct mptcp_sock *msk);
747void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
748 const struct mptcp_rm_list *rm_list);
749int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
750unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
751unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
752unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
753unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
754
755int mptcp_setsockopt(struct sock *sk, int level, int optname,
756 sockptr_t optval, unsigned int optlen);
757
758void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
759void mptcp_sockopt_sync_all(struct mptcp_sock *msk);
760
761static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
762{
763 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
764}
765
766void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
767
768static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
769{
770 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
771}
772
773static inline bool mptcp_check_fallback(const struct sock *sk)
774{
775 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
776 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
777
778 return __mptcp_check_fallback(msk);
779}
780
781static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
782{
783 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
784 pr_debug("TCP fallback already done (msk=%p)", msk);
785 return;
786 }
787 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
788}
789
790static inline void mptcp_do_fallback(struct sock *sk)
791{
792 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
793 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
794
795 __mptcp_do_fallback(msk);
796}
797
798#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
799
800static inline bool subflow_simultaneous_connect(struct sock *sk)
801{
802 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
803 struct sock *parent = subflow->conn;
804
805 return sk->sk_state == TCP_ESTABLISHED &&
806 !mptcp_sk(parent)->pm.server_side &&
807 !subflow->conn_finished;
808}
809
810#ifdef CONFIG_SYN_COOKIES
811void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
812 struct sk_buff *skb);
813bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
814 struct sk_buff *skb);
815void __init mptcp_join_cookie_init(void);
816#else
817static inline void
818subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
819 struct sk_buff *skb) {}
820static inline bool
821mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
822 struct sk_buff *skb)
823{
824 return false;
825}
826
827static inline void mptcp_join_cookie_init(void) {}
828#endif
829
830#endif
831
