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6
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#define OPTION_MPTCP_DSS BIT(11)
30#define OPTION_MPTCP_FAIL BIT(12)
31
32#define OPTION_MPTCP_CSUMREQD BIT(13)
33
34#define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
35 OPTION_MPTCP_MPC_ACK)
36#define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
37 OPTION_MPTCP_MPJ_ACK)
38
39
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
49
50
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
80
81#define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
82
83
84#define MPTCPOPT_BACKUP BIT(0)
85#define MPTCPOPT_HMAC_LEN 20
86#define MPTCPOPT_THMAC_LEN 8
87
88
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)
95
96
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)
103
104
105#define MPTCP_ADDR_ECHO BIT(0)
106
107
108#define MPTCP_PRIO_BKUP BIT(0)
109
110
111#define MPTCP_RST_TRANSIENT BIT(0)
112
113
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
120
121#define MPTCP_PUSH_PENDING 1
122#define MPTCP_CLEAN_UNA 2
123#define MPTCP_ERROR_REPORT 3
124#define MPTCP_RETRANSMIT 4
125#define MPTCP_FLUSH_JOIN_LIST 5
126#define MPTCP_CONNECTED 6
127
128static inline bool before64(__u64 seq1, __u64 seq2)
129{
130 return (__s64)(seq1 - seq2) < 0;
131}
132
133#define after64(seq2, seq1) before64(seq1, seq2)
134
135struct mptcp_options_received {
136 u64 sndr_key;
137 u64 rcvr_key;
138 u64 data_ack;
139 u64 data_seq;
140 u32 subflow_seq;
141 u16 data_len;
142 __sum16 csum;
143 u16 suboptions;
144 u32 token;
145 u32 nonce;
146 u16 use_map:1,
147 dsn64:1,
148 data_fin:1,
149 use_ack:1,
150 ack64:1,
151 mpc_map:1,
152 reset_reason:4,
153 reset_transient:1,
154 echo:1,
155 backup:1,
156 deny_join_id0:1,
157 __unused:2;
158 u8 join_id;
159 u64 thmac;
160 u8 hmac[MPTCPOPT_HMAC_LEN];
161 struct mptcp_addr_info addr;
162 struct mptcp_rm_list rm_list;
163 u64 ahmac;
164 u64 fail_seq;
165};
166
167static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
168{
169 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
170 ((nib & 0xF) << 8) | field);
171}
172
173enum mptcp_pm_status {
174 MPTCP_PM_ADD_ADDR_RECEIVED,
175 MPTCP_PM_ADD_ADDR_SEND_ACK,
176 MPTCP_PM_RM_ADDR_RECEIVED,
177 MPTCP_PM_ESTABLISHED,
178 MPTCP_PM_SUBFLOW_ESTABLISHED,
179 MPTCP_PM_ALREADY_ESTABLISHED,
180 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED
181
182
183};
184
185
186#define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1)
187
188enum mptcp_addr_signal_status {
189 MPTCP_ADD_ADDR_SIGNAL,
190 MPTCP_ADD_ADDR_ECHO,
191 MPTCP_RM_ADDR_SIGNAL,
192};
193
194
195#define MPTCP_PM_MAX_ADDR_ID U8_MAX
196
197struct mptcp_pm_data {
198 struct mptcp_addr_info local;
199 struct mptcp_addr_info remote;
200 struct list_head anno_list;
201
202 spinlock_t lock;
203
204 u8 addr_signal;
205 bool server_side;
206 bool work_pending;
207 bool accept_addr;
208 bool accept_subflow;
209 bool remote_deny_join_id0;
210 u8 add_addr_signaled;
211 u8 add_addr_accepted;
212 u8 local_addr_used;
213 u8 subflows;
214 u8 status;
215 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
216 struct mptcp_rm_list rm_list_tx;
217 struct mptcp_rm_list rm_list_rx;
218};
219
220struct mptcp_data_frag {
221 struct list_head list;
222 u64 data_seq;
223 u16 data_len;
224 u16 offset;
225 u16 overhead;
226 u16 already_sent;
227 struct page *page;
228};
229
230
231struct mptcp_sock {
232
233 struct inet_connection_sock sk;
234 u64 local_key;
235 u64 remote_key;
236 u64 write_seq;
237 u64 snd_nxt;
238 u64 ack_seq;
239 u64 rcv_wnd_sent;
240 u64 rcv_data_fin_seq;
241 int rmem_fwd_alloc;
242 struct sock *last_snd;
243 int snd_burst;
244 int old_wspace;
245 u64 recovery_snd_nxt;
246
247
248
249 u64 snd_una;
250 u64 wnd_end;
251 unsigned long timer_ival;
252 u32 token;
253 int rmem_released;
254 unsigned long flags;
255 unsigned long cb_flags;
256 unsigned long push_pending;
257 bool recovery;
258 bool can_ack;
259 bool fully_established;
260 bool rcv_data_fin;
261 bool snd_data_fin_enable;
262 bool rcv_fastclose;
263 bool use_64bit_ack;
264 bool csum_enabled;
265 u8 recvmsg_inq:1,
266 cork:1,
267 nodelay:1;
268 struct work_struct work;
269 struct sk_buff *ooo_last_skb;
270 struct rb_root out_of_order_queue;
271 struct sk_buff_head receive_queue;
272 struct list_head conn_list;
273 struct list_head rtx_queue;
274 struct mptcp_data_frag *first_pending;
275 struct list_head join_list;
276 struct socket *subflow;
277 struct sock *first;
278 struct mptcp_pm_data pm;
279 struct {
280 u32 space;
281 u32 copied;
282 u64 time;
283 u64 rtt_us;
284 } rcvq_space;
285
286 u32 setsockopt_seq;
287 char ca_name[TCP_CA_NAME_MAX];
288};
289
290#define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
291#define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
292
293#define mptcp_for_each_subflow(__msk, __subflow) \
294 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
295
296static inline void msk_owned_by_me(const struct mptcp_sock *msk)
297{
298 sock_owned_by_me((const struct sock *)msk);
299}
300
301static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
302{
303 return (struct mptcp_sock *)sk;
304}
305
306
307
308
309static inline int __mptcp_rmem(const struct sock *sk)
310{
311 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
312}
313
314static inline int __mptcp_space(const struct sock *sk)
315{
316 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
317}
318
319static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
320{
321 const struct mptcp_sock *msk = mptcp_sk(sk);
322
323 return READ_ONCE(msk->first_pending);
324}
325
326static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
327{
328 struct mptcp_sock *msk = mptcp_sk(sk);
329 struct mptcp_data_frag *cur;
330
331 cur = msk->first_pending;
332 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
333 list_next_entry(cur, list);
334}
335
336static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
337{
338 struct mptcp_sock *msk = mptcp_sk(sk);
339
340 if (!msk->first_pending)
341 return NULL;
342
343 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
344 return NULL;
345
346 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
347}
348
349static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
350{
351 struct mptcp_sock *msk = mptcp_sk(sk);
352
353 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
354 return NULL;
355
356 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
357}
358
359struct csum_pseudo_header {
360 __be64 data_seq;
361 __be32 subflow_seq;
362 __be16 data_len;
363 __sum16 csum;
364};
365
366struct mptcp_subflow_request_sock {
367 struct tcp_request_sock sk;
368 u16 mp_capable : 1,
369 mp_join : 1,
370 backup : 1,
371 csum_reqd : 1,
372 allow_join_id0 : 1;
373 u8 local_id;
374 u8 remote_id;
375 u64 local_key;
376 u64 idsn;
377 u32 token;
378 u32 ssn_offset;
379 u64 thmac;
380 u32 local_nonce;
381 u32 remote_nonce;
382 struct mptcp_sock *msk;
383 struct hlist_nulls_node token_node;
384};
385
386static inline struct mptcp_subflow_request_sock *
387mptcp_subflow_rsk(const struct request_sock *rsk)
388{
389 return (struct mptcp_subflow_request_sock *)rsk;
390}
391
392enum mptcp_data_avail {
393 MPTCP_SUBFLOW_NODATA,
394 MPTCP_SUBFLOW_DATA_AVAIL,
395};
396
397struct mptcp_delegated_action {
398 struct napi_struct napi;
399 struct list_head head;
400};
401
402DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
403
404#define MPTCP_DELEGATE_SEND 0
405#define MPTCP_DELEGATE_ACK 1
406
407
408struct mptcp_subflow_context {
409 struct list_head node;
410
411 struct_group(reset,
412
413 unsigned long avg_pacing_rate;
414 u64 local_key;
415 u64 remote_key;
416 u64 idsn;
417 u64 map_seq;
418 u32 snd_isn;
419 u32 token;
420 u32 rel_write_seq;
421 u32 map_subflow_seq;
422 u32 ssn_offset;
423 u32 map_data_len;
424 __wsum map_data_csum;
425 u32 map_csum_len;
426 u32 request_mptcp : 1,
427 request_join : 1,
428 request_bkup : 1,
429 mp_capable : 1,
430 mp_join : 1,
431 fully_established : 1,
432 pm_notified : 1,
433 conn_finished : 1,
434 map_valid : 1,
435 map_csum_reqd : 1,
436 map_data_fin : 1,
437 mpc_map : 1,
438 backup : 1,
439 send_mp_prio : 1,
440 send_mp_fail : 1,
441 send_fastclose : 1,
442 rx_eof : 1,
443 can_ack : 1,
444 disposable : 1,
445 stale : 1;
446 enum mptcp_data_avail data_avail;
447 u32 remote_nonce;
448 u64 thmac;
449 u32 local_nonce;
450 u32 remote_token;
451 u8 hmac[MPTCPOPT_HMAC_LEN];
452 u8 local_id;
453 u8 remote_id;
454 u8 reset_seen:1;
455 u8 reset_transient:1;
456 u8 reset_reason:4;
457 u8 stale_count;
458
459 long delegated_status;
460
461 );
462
463 struct list_head delegated_node;
464
465 u32 setsockopt_seq;
466 u32 stale_rcv_tstamp;
467
468 struct sock *tcp_sock;
469 struct sock *conn;
470 const struct inet_connection_sock_af_ops *icsk_af_ops;
471 void (*tcp_data_ready)(struct sock *sk);
472 void (*tcp_state_change)(struct sock *sk);
473 void (*tcp_write_space)(struct sock *sk);
474 void (*tcp_error_report)(struct sock *sk);
475
476 struct rcu_head rcu;
477};
478
479static inline struct mptcp_subflow_context *
480mptcp_subflow_ctx(const struct sock *sk)
481{
482 struct inet_connection_sock *icsk = inet_csk(sk);
483
484
485 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
486}
487
488static inline struct sock *
489mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
490{
491 return subflow->tcp_sock;
492}
493
494static inline void
495mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
496{
497 memset(&subflow->reset, 0, sizeof(subflow->reset));
498 subflow->request_mptcp = 1;
499}
500
501static inline u64
502mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
503{
504 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
505 subflow->ssn_offset -
506 subflow->map_subflow_seq;
507}
508
509static inline u64
510mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
511{
512 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
513}
514
515void mptcp_subflow_process_delegated(struct sock *ssk);
516
517static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
518{
519 struct mptcp_delegated_action *delegated;
520 bool schedule;
521
522
523 lockdep_assert_in_softirq();
524
525
526
527
528
529 if (!test_and_set_bit(action, &subflow->delegated_status)) {
530
531 if (!list_empty(&subflow->delegated_node))
532 return;
533
534 delegated = this_cpu_ptr(&mptcp_delegated_actions);
535 schedule = list_empty(&delegated->head);
536 list_add_tail(&subflow->delegated_node, &delegated->head);
537 sock_hold(mptcp_subflow_tcp_sock(subflow));
538 if (schedule)
539 napi_schedule(&delegated->napi);
540 }
541}
542
543static inline struct mptcp_subflow_context *
544mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
545{
546 struct mptcp_subflow_context *ret;
547
548 if (list_empty(&delegated->head))
549 return NULL;
550
551 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
552 list_del_init(&ret->delegated_node);
553 return ret;
554}
555
556static inline bool mptcp_subflow_has_delegated_action(const struct mptcp_subflow_context *subflow)
557{
558 return !!READ_ONCE(subflow->delegated_status);
559}
560
561static inline void mptcp_subflow_delegated_done(struct mptcp_subflow_context *subflow, int action)
562{
563
564
565
566 smp_wmb();
567 clear_bit(action, &subflow->delegated_status);
568}
569
570int mptcp_is_enabled(const struct net *net);
571unsigned int mptcp_get_add_addr_timeout(const struct net *net);
572int mptcp_is_checksum_enabled(const struct net *net);
573int mptcp_allow_join_id0(const struct net *net);
574unsigned int mptcp_stale_loss_cnt(const struct net *net);
575void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
576 struct mptcp_options_received *mp_opt);
577bool __mptcp_retransmit_pending_data(struct sock *sk);
578void mptcp_check_and_set_pending(struct sock *sk);
579void __mptcp_push_pending(struct sock *sk, unsigned int flags);
580bool mptcp_subflow_data_available(struct sock *sk);
581void __init mptcp_subflow_init(void);
582void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
583void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
584 struct mptcp_subflow_context *subflow);
585void mptcp_subflow_send_ack(struct sock *ssk);
586void mptcp_subflow_reset(struct sock *ssk);
587void mptcp_sock_graft(struct sock *sk, struct socket *parent);
588struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
589
590
591int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
592 const struct mptcp_addr_info *remote);
593int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
594void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
595 struct sockaddr_storage *addr,
596 unsigned short family);
597
598static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
599{
600 struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
601
602
603 if (subflow->request_join && !subflow->fully_established)
604 return false;
605
606
607 return ((1 << ssk->sk_state) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
608}
609
610void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
611
612bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
613
614static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
615 struct mptcp_subflow_context *ctx)
616{
617 sk->sk_data_ready = ctx->tcp_data_ready;
618 sk->sk_state_change = ctx->tcp_state_change;
619 sk->sk_write_space = ctx->tcp_write_space;
620 sk->sk_error_report = ctx->tcp_error_report;
621
622 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
623}
624
625static inline bool mptcp_has_another_subflow(struct sock *ssk)
626{
627 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk), *tmp;
628 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
629
630 mptcp_for_each_subflow(msk, tmp) {
631 if (tmp != subflow)
632 return true;
633 }
634
635 return false;
636}
637
638void __init mptcp_proto_init(void);
639#if IS_ENABLED(CONFIG_MPTCP_IPV6)
640int __init mptcp_proto_v6_init(void);
641#endif
642
643struct sock *mptcp_sk_clone(const struct sock *sk,
644 const struct mptcp_options_received *mp_opt,
645 struct request_sock *req);
646void mptcp_get_options(const struct sock *sk,
647 const struct sk_buff *skb,
648 struct mptcp_options_received *mp_opt);
649
650void mptcp_finish_connect(struct sock *sk);
651void __mptcp_set_connected(struct sock *sk);
652static inline bool mptcp_is_fully_established(struct sock *sk)
653{
654 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
655 READ_ONCE(mptcp_sk(sk)->fully_established);
656}
657void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
658void mptcp_data_ready(struct sock *sk, struct sock *ssk);
659bool mptcp_finish_join(struct sock *sk);
660bool mptcp_schedule_work(struct sock *sk);
661int mptcp_setsockopt(struct sock *sk, int level, int optname,
662 sockptr_t optval, unsigned int optlen);
663int mptcp_getsockopt(struct sock *sk, int level, int optname,
664 char __user *optval, int __user *option);
665
666u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
667static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
668{
669 if (use_64bit)
670 return cur_seq;
671
672 return __mptcp_expand_seq(old_seq, cur_seq);
673}
674void __mptcp_check_push(struct sock *sk, struct sock *ssk);
675void __mptcp_data_acked(struct sock *sk);
676void __mptcp_error_report(struct sock *sk);
677void mptcp_subflow_eof(struct sock *sk);
678bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
679static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
680{
681 return READ_ONCE(msk->snd_data_fin_enable) &&
682 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
683}
684
685static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
686{
687 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
688 return false;
689
690 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
691 return true;
692}
693
694static inline void mptcp_write_space(struct sock *sk)
695{
696 if (sk_stream_is_writeable(sk)) {
697
698 smp_mb();
699 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
700 sk_stream_write_space(sk);
701 }
702}
703
704void mptcp_destroy_common(struct mptcp_sock *msk);
705
706#define MPTCP_TOKEN_MAX_RETRIES 4
707
708void __init mptcp_token_init(void);
709static inline void mptcp_token_init_request(struct request_sock *req)
710{
711 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
712}
713
714int mptcp_token_new_request(struct request_sock *req);
715void mptcp_token_destroy_request(struct request_sock *req);
716int mptcp_token_new_connect(struct sock *sk);
717void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
718 struct mptcp_sock *msk);
719bool mptcp_token_exists(u32 token);
720struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
721struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
722 long *s_num);
723void mptcp_token_destroy(struct mptcp_sock *msk);
724
725void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
726
727void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
728u16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum);
729
730void __init mptcp_pm_init(void);
731void mptcp_pm_data_init(struct mptcp_sock *msk);
732void mptcp_pm_data_reset(struct mptcp_sock *msk);
733void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
734void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
735void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
736void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
737bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
738void mptcp_pm_connection_closed(struct mptcp_sock *msk);
739void mptcp_pm_subflow_established(struct mptcp_sock *msk);
740bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk);
741void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
742 const struct mptcp_subflow_context *subflow);
743void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
744 const struct mptcp_addr_info *addr);
745void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
746 struct mptcp_addr_info *addr);
747void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
748void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
749void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
750 const struct mptcp_rm_list *rm_list);
751void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
752void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
753void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
754bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
755struct mptcp_pm_add_entry *
756mptcp_pm_del_add_timer(struct mptcp_sock *msk,
757 struct mptcp_addr_info *addr, bool check_id);
758struct mptcp_pm_add_entry *
759mptcp_lookup_anno_list_by_saddr(struct mptcp_sock *msk,
760 struct mptcp_addr_info *addr);
761int mptcp_pm_get_flags_and_ifindex_by_id(struct net *net, unsigned int id,
762 u8 *flags, int *ifindex);
763
764int mptcp_pm_announce_addr(struct mptcp_sock *msk,
765 const struct mptcp_addr_info *addr,
766 bool echo);
767int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
768int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
769
770void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
771 const struct sock *ssk, gfp_t gfp);
772void mptcp_event_addr_announced(const struct mptcp_sock *msk, const struct mptcp_addr_info *info);
773void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
774
775static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
776{
777 return READ_ONCE(msk->pm.addr_signal) &
778 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
779}
780
781static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
782{
783 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
784}
785
786static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
787{
788 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
789}
790
791static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
792{
793 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
794}
795
796static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
797{
798 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
799
800 if (family == AF_INET6)
801 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
802 if (!echo)
803 len += MPTCPOPT_THMAC_LEN;
804
805 if (port)
806 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
807
808 return len;
809}
810
811static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
812{
813 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
814 return -EINVAL;
815
816 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
817}
818
819bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, struct sk_buff *skb,
820 unsigned int opt_size, unsigned int remaining,
821 struct mptcp_addr_info *addr, bool *echo,
822 bool *port, bool *drop_other_suboptions);
823bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
824 struct mptcp_rm_list *rm_list);
825int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
826
827void __init mptcp_pm_nl_init(void);
828void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
829void mptcp_pm_nl_work(struct mptcp_sock *msk);
830void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
831 const struct mptcp_rm_list *rm_list);
832int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
833unsigned int mptcp_pm_get_add_addr_signal_max(struct mptcp_sock *msk);
834unsigned int mptcp_pm_get_add_addr_accept_max(struct mptcp_sock *msk);
835unsigned int mptcp_pm_get_subflows_max(struct mptcp_sock *msk);
836unsigned int mptcp_pm_get_local_addr_max(struct mptcp_sock *msk);
837
838void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
839void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk);
840
841static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
842{
843 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
844}
845
846void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
847
848static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
849{
850 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
851}
852
853static inline bool mptcp_check_fallback(const struct sock *sk)
854{
855 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
856 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
857
858 return __mptcp_check_fallback(msk);
859}
860
861static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
862{
863 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
864 pr_debug("TCP fallback already done (msk=%p)", msk);
865 return;
866 }
867 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
868}
869
870static inline void mptcp_do_fallback(struct sock *sk)
871{
872 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
873 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
874
875 __mptcp_do_fallback(msk);
876}
877
878#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
879
880static inline bool subflow_simultaneous_connect(struct sock *sk)
881{
882 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
883 struct sock *parent = subflow->conn;
884
885 return sk->sk_state == TCP_ESTABLISHED &&
886 !mptcp_sk(parent)->pm.server_side &&
887 !subflow->conn_finished;
888}
889
890#ifdef CONFIG_SYN_COOKIES
891void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
892 struct sk_buff *skb);
893bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
894 struct sk_buff *skb);
895void __init mptcp_join_cookie_init(void);
896#else
897static inline void
898subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
899 struct sk_buff *skb) {}
900static inline bool
901mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
902 struct sk_buff *skb)
903{
904 return false;
905}
906
907static inline void mptcp_join_cookie_init(void) {}
908#endif
909
910#endif
911
