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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
14#define MPTCP_SUPPORTED_VERSION 1
15
16
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)
27
28
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
37
38
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
63
64
65#define MPTCPOPT_BACKUP BIT(0)
66#define MPTCPOPT_HMAC_LEN 20
67#define MPTCPOPT_THMAC_LEN 8
68
69
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)
75
76
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)
83
84
85#define MPTCP_ADDR_ECHO BIT(0)
86#define MPTCP_ADDR_IPVERSION_4 4
87#define MPTCP_ADDR_IPVERSION_6 6
88
89
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
98
99static inline bool before64(__u64 seq1, __u64 seq2)
100{
101 return (__s64)(seq1 - seq2) < 0;
102}
103
104#define after64(seq2, seq1) before64(seq1, seq2)
105
106struct 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
141 };
142 u64 ahmac;
143 u16 port;
144};
145
146static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
147{
148 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
149 ((nib & 0xF) << 8) | field);
150}
151
152struct 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
163 };
164};
165
166enum 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,
172 MPTCP_PM_SUBFLOW_ESTABLISHED,
173};
174
175enum 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,
181};
182
183struct mptcp_pm_data {
184 struct mptcp_addr_info local;
185 struct mptcp_addr_info remote;
186 struct list_head anno_list;
187
188 spinlock_t lock;
189
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;
205};
206
207struct 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;
215};
216
217
218struct mptcp_sock {
219
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;
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;
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;
259 struct sock *first;
260 struct mptcp_pm_data pm;
261 struct {
262 u32 space;
263 u32 copied;
264 u64 time;
265 u64 rtt_us;
266 } rcvq_space;
267};
268
269#define mptcp_lock_sock(___sk, cb) do { \
270 struct sock *__sk = (___sk); \
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)
281
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)
284
285#define mptcp_for_each_subflow(__msk, __subflow) \
286 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
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_pending);
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_tail(const struct sock *sk)
329{
330 struct mptcp_sock *msk = mptcp_sk(sk);
331
332 if (!before64(msk->snd_nxt, READ_ONCE(msk->snd_una)))
333 return NULL;
334
335 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
336}
337
338static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
339{
340 struct mptcp_sock *msk = mptcp_sk(sk);
341
342 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
343}
344
345struct 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;
361};
362
363static inline struct mptcp_subflow_request_sock *
364mptcp_subflow_rsk(const struct request_sock *rsk)
365{
366 return (struct mptcp_subflow_request_sock *)rsk;
367}
368
369enum mptcp_data_avail {
370 MPTCP_SUBFLOW_NODATA,
371 MPTCP_SUBFLOW_DATA_AVAIL,
372 MPTCP_SUBFLOW_OOO_DATA
373};
374
375
376struct mptcp_subflow_context {
377 struct list_head node;
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,
389 request_join : 1,
390 request_bkup : 1,
391 mp_capable : 1,
392 mp_join : 1,
393 fully_established : 1,
394 pm_notified : 1,
395 conn_finished : 1,
396 map_valid : 1,
397 mpc_map : 1,
398 backup : 1,
399 rx_eof : 1,
400 can_ack : 1,
401 disposable : 1;
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;
410
411 struct sock *tcp_sock;
412 struct sock *conn;
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);
417
418 struct rcu_head rcu;
419};
420
421static inline struct mptcp_subflow_context *
422mptcp_subflow_ctx(const struct sock *sk)
423{
424 struct inet_connection_sock *icsk = inet_csk(sk);
425
426
427 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
428}
429
430static inline struct sock *
431mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
432{
433 return subflow->tcp_sock;
434}
435
436static inline u64
437mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
438{
439 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
440 subflow->ssn_offset -
441 subflow->map_subflow_seq;
442}
443
444static inline u64
445mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
446{
447 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
448}
449
450static inline void mptcp_add_pending_subflow(struct mptcp_sock *msk,
451 struct mptcp_subflow_context *subflow)
452{
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);
457}
458
459int mptcp_is_enabled(struct net *net);
460unsigned int mptcp_get_add_addr_timeout(struct net *net);
461void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
462 struct mptcp_options_received *mp_opt);
463bool mptcp_subflow_data_available(struct sock *sk);
464void __init mptcp_subflow_init(void);
465void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
466void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
467 struct mptcp_subflow_context *subflow);
468void mptcp_subflow_reset(struct sock *ssk);
469
470
471int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
472 const struct mptcp_addr_info *remote);
473int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock);
474
475static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
476 struct mptcp_subflow_context *ctx)
477{
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;
481
482 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
483}
484
485void __init mptcp_proto_init(void);
486#if IS_ENABLED(CONFIG_MPTCP_IPV6)
487int __init mptcp_proto_v6_init(void);
488#endif
489
490struct sock *mptcp_sk_clone(const struct sock *sk,
491 const struct mptcp_options_received *mp_opt,
492 struct request_sock *req);
493void mptcp_get_options(const struct sk_buff *skb,
494 struct mptcp_options_received *mp_opt);
495
496void mptcp_finish_connect(struct sock *sk);
497static inline bool mptcp_is_fully_established(struct sock *sk)
498{
499 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
500 READ_ONCE(mptcp_sk(sk)->fully_established);
501}
502void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
503void mptcp_data_ready(struct sock *sk, struct sock *ssk);
504bool mptcp_finish_join(struct sock *sk);
505bool mptcp_schedule_work(struct sock *sk);
506void __mptcp_check_push(struct sock *sk, struct sock *ssk);
507void __mptcp_data_acked(struct sock *sk);
508void mptcp_subflow_eof(struct sock *sk);
509bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
510void __mptcp_flush_join_list(struct mptcp_sock *msk);
511static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
512{
513 return READ_ONCE(msk->snd_data_fin_enable) &&
514 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
515}
516
517void mptcp_destroy_common(struct mptcp_sock *msk);
518
519void __init mptcp_token_init(void);
520static inline void mptcp_token_init_request(struct request_sock *req)
521{
522 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
523}
524
525int mptcp_token_new_request(struct request_sock *req);
526void mptcp_token_destroy_request(struct request_sock *req);
527int mptcp_token_new_connect(struct sock *sk);
528void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
529 struct mptcp_sock *msk);
530bool mptcp_token_exists(u32 token);
531struct mptcp_sock *mptcp_token_get_sock(u32 token);
532struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
533 long *s_num);
534void mptcp_token_destroy(struct mptcp_sock *msk);
535
536void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
537
538void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
539
540void __init mptcp_pm_init(void);
541void mptcp_pm_data_init(struct mptcp_sock *msk);
542void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side);
543void mptcp_pm_fully_established(struct mptcp_sock *msk);
544bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
545void mptcp_pm_connection_closed(struct mptcp_sock *msk);
546void mptcp_pm_subflow_established(struct mptcp_sock *msk,
547 struct mptcp_subflow_context *subflow);
548void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id);
549void mptcp_pm_add_addr_received(struct mptcp_sock *msk,
550 const struct mptcp_addr_info *addr);
551void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
552void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id);
553void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
554struct mptcp_pm_add_entry *
555mptcp_pm_del_add_timer(struct mptcp_sock *msk,
556 struct mptcp_addr_info *addr);
557
558int mptcp_pm_announce_addr(struct mptcp_sock *msk,
559 const struct mptcp_addr_info *addr,
560 bool echo, bool port);
561int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id);
562int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id);
563
564static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
565{
566 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
567}
568
569static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
570{
571 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
572}
573
574static inline bool mptcp_pm_should_add_signal_ipv6(struct mptcp_sock *msk)
575{
576 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_IPV6);
577}
578
579static inline bool mptcp_pm_should_add_signal_port(struct mptcp_sock *msk)
580{
581 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_PORT);
582}
583
584static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
585{
586 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
587}
588
589static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
590{
591 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
592
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;
599
600 return len;
601}
602
603bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
604 struct mptcp_addr_info *saddr, bool *echo, bool *port);
605bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
606 u8 *rm_id);
607int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
608
609void __init mptcp_pm_nl_init(void);
610void mptcp_pm_nl_data_init(struct mptcp_sock *msk);
611void mptcp_pm_nl_fully_established(struct mptcp_sock *msk);
612void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk);
613void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk);
614void mptcp_pm_nl_add_addr_send_ack(struct mptcp_sock *msk);
615void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk);
616void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id);
617int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
618
619static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb)
620{
621 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
622}
623
624void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
625
626static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
627{
628 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
629}
630
631static inline bool mptcp_check_fallback(const struct sock *sk)
632{
633 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
634 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
635
636 return __mptcp_check_fallback(msk);
637}
638
639static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
640{
641 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
642 pr_debug("TCP fallback already done (msk=%p)", msk);
643 return;
644 }
645 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
646}
647
648static inline void mptcp_do_fallback(struct sock *sk)
649{
650 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
651 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
652
653 __mptcp_do_fallback(msk);
654}
655
656#define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
657
658static inline bool subflow_simultaneous_connect(struct sock *sk)
659{
660 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
661 struct sock *parent = subflow->conn;
662
663 return sk->sk_state == TCP_ESTABLISHED &&
664 !mptcp_sk(parent)->pm.server_side &&
665 !subflow->conn_finished;
666}
667
668#ifdef CONFIG_SYN_COOKIES
669void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
670 struct sk_buff *skb);
671bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
672 struct sk_buff *skb);
673void __init mptcp_join_cookie_init(void);
674#else
675static inline void
676subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
677 struct sk_buff *skb) {}
678static inline bool
679mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
680 struct sk_buff *skb)
681{
682 return false;
683}
684
685static inline void mptcp_join_cookie_init(void) {}
686#endif
687
688#endif
689
