1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Multipath TCP
3 *
4 * Copyright (c) 2017 - 2019, Intel Corporation.
5 */
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 #include <net/genetlink.h>
15
16 #define MPTCP_SUPPORTED_VERSION 1
17
18 /* MPTCP option bits */
19 #define OPTION_MPTCP_MPC_SYN BIT(0)
20 #define OPTION_MPTCP_MPC_SYNACK BIT(1)
21 #define OPTION_MPTCP_MPC_ACK BIT(2)
22 #define OPTION_MPTCP_MPJ_SYN BIT(3)
23 #define OPTION_MPTCP_MPJ_SYNACK BIT(4)
24 #define OPTION_MPTCP_MPJ_ACK BIT(5)
25 #define OPTION_MPTCP_ADD_ADDR BIT(6)
26 #define OPTION_MPTCP_RM_ADDR BIT(7)
27 #define OPTION_MPTCP_FASTCLOSE BIT(8)
28 #define OPTION_MPTCP_PRIO BIT(9)
29 #define OPTION_MPTCP_RST BIT(10)
30 #define OPTION_MPTCP_DSS BIT(11)
31 #define OPTION_MPTCP_FAIL BIT(12)
32
33 #define OPTION_MPTCP_CSUMREQD BIT(13)
34
35 #define OPTIONS_MPTCP_MPC (OPTION_MPTCP_MPC_SYN | OPTION_MPTCP_MPC_SYNACK | \
36 OPTION_MPTCP_MPC_ACK)
37 #define OPTIONS_MPTCP_MPJ (OPTION_MPTCP_MPJ_SYN | OPTION_MPTCP_MPJ_SYNACK | \
38 OPTION_MPTCP_MPJ_ACK)
39
40 /* MPTCP option subtypes */
41 #define MPTCPOPT_MP_CAPABLE 0
42 #define MPTCPOPT_MP_JOIN 1
43 #define MPTCPOPT_DSS 2
44 #define MPTCPOPT_ADD_ADDR 3
45 #define MPTCPOPT_RM_ADDR 4
46 #define MPTCPOPT_MP_PRIO 5
47 #define MPTCPOPT_MP_FAIL 6
48 #define MPTCPOPT_MP_FASTCLOSE 7
49 #define MPTCPOPT_RST 8
50
51 /* MPTCP suboption lengths */
52 #define TCPOLEN_MPTCP_MPC_SYN 4
53 #define TCPOLEN_MPTCP_MPC_SYNACK 12
54 #define TCPOLEN_MPTCP_MPC_ACK 20
55 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22
56 #define TCPOLEN_MPTCP_MPJ_SYN 12
57 #define TCPOLEN_MPTCP_MPJ_SYNACK 16
58 #define TCPOLEN_MPTCP_MPJ_ACK 24
59 #define TCPOLEN_MPTCP_DSS_BASE 4
60 #define TCPOLEN_MPTCP_DSS_ACK32 4
61 #define TCPOLEN_MPTCP_DSS_ACK64 8
62 #define TCPOLEN_MPTCP_DSS_MAP32 10
63 #define TCPOLEN_MPTCP_DSS_MAP64 14
64 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2
65 #define TCPOLEN_MPTCP_ADD_ADDR 16
66 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18
67 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8
68 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10
69 #define TCPOLEN_MPTCP_ADD_ADDR6 28
70 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30
71 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20
72 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22
73 #define TCPOLEN_MPTCP_PORT_LEN 2
74 #define TCPOLEN_MPTCP_PORT_ALIGN 2
75 #define TCPOLEN_MPTCP_RM_ADDR_BASE 3
76 #define TCPOLEN_MPTCP_PRIO 3
77 #define TCPOLEN_MPTCP_PRIO_ALIGN 4
78 #define TCPOLEN_MPTCP_FASTCLOSE 12
79 #define TCPOLEN_MPTCP_RST 4
80 #define TCPOLEN_MPTCP_FAIL 12
81
82 #define TCPOLEN_MPTCP_MPC_ACK_DATA_CSUM (TCPOLEN_MPTCP_DSS_CHECKSUM + TCPOLEN_MPTCP_MPC_ACK_DATA)
83
84 /* MPTCP MP_JOIN flags */
85 #define MPTCPOPT_BACKUP BIT(0)
86 #define MPTCPOPT_THMAC_LEN 8
87
88 /* MPTCP MP_CAPABLE flags */
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 /* MPTCP DSS flags */
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 /* MPTCP ADD_ADDR flags */
105 #define MPTCP_ADDR_ECHO BIT(0)
106
107 /* MPTCP MP_PRIO flags */
108 #define MPTCP_PRIO_BKUP BIT(0)
109
110 /* MPTCP TCPRST flags */
111 #define MPTCP_RST_TRANSIENT BIT(0)
112
113 /* MPTCP socket atomic flags */
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 /* MPTCP socket release cb flags */
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 #define MPTCP_RESET_SCHEDULER 7
128
before64(__u64 seq1,__u64 seq2)129 static inline bool before64(__u64 seq1, __u64 seq2)
130 {
131 return (__s64)(seq1 - seq2) < 0;
132 }
133
134 #define after64(seq2, seq1) before64(seq1, seq2)
135
136 struct mptcp_options_received {
137 u64 sndr_key;
138 u64 rcvr_key;
139 u64 data_ack;
140 u64 data_seq;
141 u32 subflow_seq;
142 u16 data_len;
143 __sum16 csum;
144 u16 suboptions;
145 u32 token;
146 u32 nonce;
147 u16 use_map:1,
148 dsn64:1,
149 data_fin:1,
150 use_ack:1,
151 ack64:1,
152 mpc_map:1,
153 reset_reason:4,
154 reset_transient:1,
155 echo:1,
156 backup:1,
157 deny_join_id0:1,
158 __unused:2;
159 u8 join_id;
160 u64 thmac;
161 u8 hmac[MPTCPOPT_HMAC_LEN];
162 struct mptcp_addr_info addr;
163 struct mptcp_rm_list rm_list;
164 u64 ahmac;
165 u64 fail_seq;
166 };
167
mptcp_option(u8 subopt,u8 len,u8 nib,u8 field)168 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field)
169 {
170 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) |
171 ((nib & 0xF) << 8) | field);
172 }
173
174 enum mptcp_pm_status {
175 MPTCP_PM_ADD_ADDR_RECEIVED,
176 MPTCP_PM_ADD_ADDR_SEND_ACK,
177 MPTCP_PM_RM_ADDR_RECEIVED,
178 MPTCP_PM_ESTABLISHED,
179 MPTCP_PM_SUBFLOW_ESTABLISHED,
180 MPTCP_PM_ALREADY_ESTABLISHED, /* persistent status, set after ESTABLISHED event */
181 MPTCP_PM_MPC_ENDPOINT_ACCOUNTED /* persistent status, set after MPC local address is
182 * accounted int id_avail_bitmap
183 */
184 };
185
186 enum mptcp_pm_type {
187 MPTCP_PM_TYPE_KERNEL = 0,
188 MPTCP_PM_TYPE_USERSPACE,
189
190 __MPTCP_PM_TYPE_NR,
191 __MPTCP_PM_TYPE_MAX = __MPTCP_PM_TYPE_NR - 1,
192 };
193
194 /* Status bits below MPTCP_PM_ALREADY_ESTABLISHED need pm worker actions */
195 #define MPTCP_PM_WORK_MASK ((1 << MPTCP_PM_ALREADY_ESTABLISHED) - 1)
196
197 enum mptcp_addr_signal_status {
198 MPTCP_ADD_ADDR_SIGNAL,
199 MPTCP_ADD_ADDR_ECHO,
200 MPTCP_RM_ADDR_SIGNAL,
201 };
202
203 /* max value of mptcp_addr_info.id */
204 #define MPTCP_PM_MAX_ADDR_ID U8_MAX
205
206 struct mptcp_pm_data {
207 struct mptcp_addr_info local;
208 struct mptcp_addr_info remote;
209 struct list_head anno_list;
210 struct list_head userspace_pm_local_addr_list;
211
212 spinlock_t lock; /*protects the whole PM data */
213
214 u8 addr_signal;
215 bool server_side;
216 bool work_pending;
217 bool accept_addr;
218 bool accept_subflow;
219 bool remote_deny_join_id0;
220 u8 add_addr_signaled;
221 u8 add_addr_accepted;
222 u8 local_addr_used;
223 u8 pm_type;
224 u8 subflows;
225 u8 status;
226 DECLARE_BITMAP(id_avail_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
227 struct mptcp_rm_list rm_list_tx;
228 struct mptcp_rm_list rm_list_rx;
229 };
230
231 struct mptcp_pm_addr_entry {
232 struct list_head list;
233 struct mptcp_addr_info addr;
234 u8 flags;
235 int ifindex;
236 struct socket *lsk;
237 };
238
239 struct mptcp_data_frag {
240 struct list_head list;
241 u64 data_seq;
242 u16 data_len;
243 u16 offset;
244 u16 overhead;
245 u16 already_sent;
246 struct page *page;
247 };
248
249 /* MPTCP connection sock */
250 struct mptcp_sock {
251 /* inet_connection_sock must be the first member */
252 struct inet_connection_sock sk;
253 u64 local_key;
254 u64 remote_key;
255 u64 write_seq;
256 u64 snd_nxt;
257 u64 ack_seq;
258 atomic64_t rcv_wnd_sent;
259 u64 rcv_data_fin_seq;
260 int rmem_fwd_alloc;
261 struct sock *last_snd;
262 int snd_burst;
263 int old_wspace;
264 u64 recovery_snd_nxt; /* in recovery mode accept up to this seq;
265 * recovery related fields are under data_lock
266 * protection
267 */
268 u64 snd_una;
269 u64 wnd_end;
270 unsigned long timer_ival;
271 u32 token;
272 int rmem_released;
273 unsigned long flags;
274 unsigned long cb_flags;
275 bool recovery; /* closing subflow write queue reinjected */
276 bool can_ack;
277 bool fully_established;
278 bool rcv_data_fin;
279 bool snd_data_fin_enable;
280 bool rcv_fastclose;
281 bool use_64bit_ack; /* Set when we received a 64-bit DSN */
282 bool csum_enabled;
283 bool allow_infinite_fallback;
284 u8 mpc_endpoint_id;
285 u8 recvmsg_inq:1,
286 cork:1,
287 nodelay:1,
288 fastopening:1,
289 in_accept_queue:1,
290 free_first:1;
291 struct work_struct work;
292 struct sk_buff *ooo_last_skb;
293 struct rb_root out_of_order_queue;
294 struct sk_buff_head receive_queue;
295 struct list_head conn_list;
296 struct list_head rtx_queue;
297 struct mptcp_data_frag *first_pending;
298 struct list_head join_list;
299 struct socket *subflow; /* outgoing connect/listener/!mp_capable
300 * The mptcp ops can safely dereference, using suitable
301 * ONCE annotation, the subflow outside the socket
302 * lock as such sock is freed after close().
303 */
304 struct sock *first;
305 struct mptcp_pm_data pm;
306 struct {
307 u32 space; /* bytes copied in last measurement window */
308 u32 copied; /* bytes copied in this measurement window */
309 u64 time; /* start time of measurement window */
310 u64 rtt_us; /* last maximum rtt of subflows */
311 } rcvq_space;
312
313 u32 setsockopt_seq;
314 char ca_name[TCP_CA_NAME_MAX];
315 };
316
317 #define mptcp_data_lock(sk) spin_lock_bh(&(sk)->sk_lock.slock)
318 #define mptcp_data_unlock(sk) spin_unlock_bh(&(sk)->sk_lock.slock)
319
320 #define mptcp_for_each_subflow(__msk, __subflow) \
321 list_for_each_entry(__subflow, &((__msk)->conn_list), node)
322 #define mptcp_for_each_subflow_safe(__msk, __subflow, __tmp) \
323 list_for_each_entry_safe(__subflow, __tmp, &((__msk)->conn_list), node)
324
msk_owned_by_me(const struct mptcp_sock * msk)325 static inline void msk_owned_by_me(const struct mptcp_sock *msk)
326 {
327 sock_owned_by_me((const struct sock *)msk);
328 }
329
mptcp_sk(const struct sock * sk)330 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk)
331 {
332 return (struct mptcp_sock *)sk;
333 }
334
335 /* the msk socket don't use the backlog, also account for the bulk
336 * free memory
337 */
__mptcp_rmem(const struct sock * sk)338 static inline int __mptcp_rmem(const struct sock *sk)
339 {
340 return atomic_read(&sk->sk_rmem_alloc) - READ_ONCE(mptcp_sk(sk)->rmem_released);
341 }
342
__mptcp_space(const struct sock * sk)343 static inline int __mptcp_space(const struct sock *sk)
344 {
345 return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) - __mptcp_rmem(sk));
346 }
347
mptcp_send_head(const struct sock * sk)348 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk)
349 {
350 const struct mptcp_sock *msk = mptcp_sk(sk);
351
352 return READ_ONCE(msk->first_pending);
353 }
354
mptcp_send_next(struct sock * sk)355 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk)
356 {
357 struct mptcp_sock *msk = mptcp_sk(sk);
358 struct mptcp_data_frag *cur;
359
360 cur = msk->first_pending;
361 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL :
362 list_next_entry(cur, list);
363 }
364
mptcp_pending_tail(const struct sock * sk)365 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk)
366 {
367 struct mptcp_sock *msk = mptcp_sk(sk);
368
369 if (!msk->first_pending)
370 return NULL;
371
372 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue)))
373 return NULL;
374
375 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list);
376 }
377
mptcp_rtx_head(const struct sock * sk)378 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk)
379 {
380 struct mptcp_sock *msk = mptcp_sk(sk);
381
382 if (msk->snd_una == READ_ONCE(msk->snd_nxt))
383 return NULL;
384
385 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list);
386 }
387
388 struct csum_pseudo_header {
389 __be64 data_seq;
390 __be32 subflow_seq;
391 __be16 data_len;
392 __sum16 csum;
393 };
394
395 struct mptcp_subflow_request_sock {
396 struct tcp_request_sock sk;
397 u16 mp_capable : 1,
398 mp_join : 1,
399 backup : 1,
400 csum_reqd : 1,
401 allow_join_id0 : 1;
402 u8 local_id;
403 u8 remote_id;
404 u64 local_key;
405 u64 idsn;
406 u32 token;
407 u32 ssn_offset;
408 u64 thmac;
409 u32 local_nonce;
410 u32 remote_nonce;
411 struct mptcp_sock *msk;
412 struct hlist_nulls_node token_node;
413 };
414
415 static inline struct mptcp_subflow_request_sock *
mptcp_subflow_rsk(const struct request_sock * rsk)416 mptcp_subflow_rsk(const struct request_sock *rsk)
417 {
418 return (struct mptcp_subflow_request_sock *)rsk;
419 }
420
421 enum mptcp_data_avail {
422 MPTCP_SUBFLOW_NODATA,
423 MPTCP_SUBFLOW_DATA_AVAIL,
424 };
425
426 struct mptcp_delegated_action {
427 struct napi_struct napi;
428 struct list_head head;
429 };
430
431 DECLARE_PER_CPU(struct mptcp_delegated_action, mptcp_delegated_actions);
432
433 #define MPTCP_DELEGATE_SCHEDULED 0
434 #define MPTCP_DELEGATE_SEND 1
435 #define MPTCP_DELEGATE_ACK 2
436
437 #define MPTCP_DELEGATE_ACTIONS_MASK (~BIT(MPTCP_DELEGATE_SCHEDULED))
438 /* MPTCP subflow context */
439 struct mptcp_subflow_context {
440 struct list_head node;/* conn_list of subflows */
441
442 struct_group(reset,
443
444 unsigned long avg_pacing_rate; /* protected by msk socket lock */
445 u64 local_key;
446 u64 remote_key;
447 u64 idsn;
448 u64 map_seq;
449 u32 snd_isn;
450 u32 token;
451 u32 rel_write_seq;
452 u32 map_subflow_seq;
453 u32 ssn_offset;
454 u32 map_data_len;
455 __wsum map_data_csum;
456 u32 map_csum_len;
457 u32 request_mptcp : 1, /* send MP_CAPABLE */
458 request_join : 1, /* send MP_JOIN */
459 request_bkup : 1,
460 mp_capable : 1, /* remote is MPTCP capable */
461 mp_join : 1, /* remote is JOINing */
462 fully_established : 1, /* path validated */
463 pm_notified : 1, /* PM hook called for established status */
464 conn_finished : 1,
465 map_valid : 1,
466 map_csum_reqd : 1,
467 map_data_fin : 1,
468 mpc_map : 1,
469 backup : 1,
470 send_mp_prio : 1,
471 send_mp_fail : 1,
472 send_fastclose : 1,
473 send_infinite_map : 1,
474 rx_eof : 1,
475 can_ack : 1, /* only after processing the remote a key */
476 disposable : 1, /* ctx can be free at ulp release time */
477 stale : 1, /* unable to snd/rcv data, do not use for xmit */
478 local_id_valid : 1, /* local_id is correctly initialized */
479 valid_csum_seen : 1; /* at least one csum validated */
480 enum mptcp_data_avail data_avail;
481 u32 remote_nonce;
482 u64 thmac;
483 u32 local_nonce;
484 u32 remote_token;
485 u8 hmac[MPTCPOPT_HMAC_LEN];
486 u8 local_id;
487 u8 remote_id;
488 u8 reset_seen:1;
489 u8 reset_transient:1;
490 u8 reset_reason:4;
491 u8 stale_count;
492
493 long delegated_status;
494 unsigned long fail_tout;
495
496 );
497
498 struct list_head delegated_node; /* link into delegated_action, protected by local BH */
499
500 u32 setsockopt_seq;
501 u32 stale_rcv_tstamp;
502
503 struct sock *tcp_sock; /* tcp sk backpointer */
504 struct sock *conn; /* parent mptcp_sock */
505 const struct inet_connection_sock_af_ops *icsk_af_ops;
506 void (*tcp_state_change)(struct sock *sk);
507 void (*tcp_error_report)(struct sock *sk);
508
509 struct rcu_head rcu;
510 };
511
512 static inline struct mptcp_subflow_context *
mptcp_subflow_ctx(const struct sock * sk)513 mptcp_subflow_ctx(const struct sock *sk)
514 {
515 struct inet_connection_sock *icsk = inet_csk(sk);
516
517 /* Use RCU on icsk_ulp_data only for sock diag code */
518 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data;
519 }
520
521 static inline struct sock *
mptcp_subflow_tcp_sock(const struct mptcp_subflow_context * subflow)522 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow)
523 {
524 return subflow->tcp_sock;
525 }
526
527 static inline void
mptcp_subflow_ctx_reset(struct mptcp_subflow_context * subflow)528 mptcp_subflow_ctx_reset(struct mptcp_subflow_context *subflow)
529 {
530 memset(&subflow->reset, 0, sizeof(subflow->reset));
531 subflow->request_mptcp = 1;
532 }
533
534 static inline u64
mptcp_subflow_get_map_offset(const struct mptcp_subflow_context * subflow)535 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow)
536 {
537 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq -
538 subflow->ssn_offset -
539 subflow->map_subflow_seq;
540 }
541
542 static inline u64
mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context * subflow)543 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow)
544 {
545 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow);
546 }
547
548 void mptcp_subflow_process_delegated(struct sock *ssk, long actions);
549
mptcp_subflow_delegate(struct mptcp_subflow_context * subflow,int action)550 static inline void mptcp_subflow_delegate(struct mptcp_subflow_context *subflow, int action)
551 {
552 long old, set_bits = BIT(MPTCP_DELEGATE_SCHEDULED) | BIT(action);
553 struct mptcp_delegated_action *delegated;
554 bool schedule;
555
556 /* the caller held the subflow bh socket lock */
557 lockdep_assert_in_softirq();
558
559 /* The implied barrier pairs with tcp_release_cb_override()
560 * mptcp_napi_poll(), and ensures the below list check sees list
561 * updates done prior to delegated status bits changes
562 */
563 old = set_mask_bits(&subflow->delegated_status, 0, set_bits);
564 if (!(old & BIT(MPTCP_DELEGATE_SCHEDULED))) {
565 if (WARN_ON_ONCE(!list_empty(&subflow->delegated_node)))
566 return;
567
568 delegated = this_cpu_ptr(&mptcp_delegated_actions);
569 schedule = list_empty(&delegated->head);
570 list_add_tail(&subflow->delegated_node, &delegated->head);
571 sock_hold(mptcp_subflow_tcp_sock(subflow));
572 if (schedule)
573 napi_schedule(&delegated->napi);
574 }
575 }
576
577 static inline struct mptcp_subflow_context *
mptcp_subflow_delegated_next(struct mptcp_delegated_action * delegated)578 mptcp_subflow_delegated_next(struct mptcp_delegated_action *delegated)
579 {
580 struct mptcp_subflow_context *ret;
581
582 if (list_empty(&delegated->head))
583 return NULL;
584
585 ret = list_first_entry(&delegated->head, struct mptcp_subflow_context, delegated_node);
586 list_del_init(&ret->delegated_node);
587 return ret;
588 }
589
590 int mptcp_is_enabled(const struct net *net);
591 unsigned int mptcp_get_add_addr_timeout(const struct net *net);
592 int mptcp_is_checksum_enabled(const struct net *net);
593 int mptcp_allow_join_id0(const struct net *net);
594 unsigned int mptcp_stale_loss_cnt(const struct net *net);
595 int mptcp_get_pm_type(const struct net *net);
596 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow,
597 struct mptcp_options_received *mp_opt);
598 bool __mptcp_retransmit_pending_data(struct sock *sk);
599 void mptcp_check_and_set_pending(struct sock *sk);
600 void __mptcp_push_pending(struct sock *sk, unsigned int flags);
601 bool mptcp_subflow_data_available(struct sock *sk);
602 void __init mptcp_subflow_init(void);
603 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how);
604 void mptcp_close_ssk(struct sock *sk, struct sock *ssk,
605 struct mptcp_subflow_context *subflow);
606 void __mptcp_subflow_send_ack(struct sock *ssk);
607 void mptcp_subflow_reset(struct sock *ssk);
608 void mptcp_subflow_queue_clean(struct sock *sk, struct sock *ssk);
609 void mptcp_sock_graft(struct sock *sk, struct socket *parent);
610 struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk);
611 bool __mptcp_close(struct sock *sk, long timeout);
612 void mptcp_cancel_work(struct sock *sk);
613 void __mptcp_unaccepted_force_close(struct sock *sk);
614
615 bool mptcp_addresses_equal(const struct mptcp_addr_info *a,
616 const struct mptcp_addr_info *b, bool use_port);
617
618 /* called with sk socket lock held */
619 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc,
620 const struct mptcp_addr_info *remote);
621 int mptcp_subflow_create_socket(struct sock *sk, unsigned short family,
622 struct socket **new_sock);
623 void mptcp_info2sockaddr(const struct mptcp_addr_info *info,
624 struct sockaddr_storage *addr,
625 unsigned short family);
626
__tcp_can_send(const struct sock * ssk)627 static inline bool __tcp_can_send(const struct sock *ssk)
628 {
629 /* only send if our side has not closed yet */
630 return ((1 << inet_sk_state_load(ssk)) & (TCPF_ESTABLISHED | TCPF_CLOSE_WAIT));
631 }
632
__mptcp_subflow_active(struct mptcp_subflow_context * subflow)633 static inline bool __mptcp_subflow_active(struct mptcp_subflow_context *subflow)
634 {
635 /* can't send if JOIN hasn't completed yet (i.e. is usable for mptcp) */
636 if (subflow->request_join && !subflow->fully_established)
637 return false;
638
639 return __tcp_can_send(mptcp_subflow_tcp_sock(subflow));
640 }
641
642 void mptcp_subflow_set_active(struct mptcp_subflow_context *subflow);
643
644 bool mptcp_subflow_active(struct mptcp_subflow_context *subflow);
645
646 void mptcp_subflow_drop_ctx(struct sock *ssk);
647
mptcp_subflow_tcp_fallback(struct sock * sk,struct mptcp_subflow_context * ctx)648 static inline void mptcp_subflow_tcp_fallback(struct sock *sk,
649 struct mptcp_subflow_context *ctx)
650 {
651 sk->sk_data_ready = sock_def_readable;
652 sk->sk_state_change = ctx->tcp_state_change;
653 sk->sk_write_space = sk_stream_write_space;
654 sk->sk_error_report = ctx->tcp_error_report;
655
656 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops;
657 }
658
659 void __init mptcp_proto_init(void);
660 #if IS_ENABLED(CONFIG_MPTCP_IPV6)
661 int __init mptcp_proto_v6_init(void);
662 #endif
663
664 struct sock *mptcp_sk_clone_init(const struct sock *sk,
665 const struct mptcp_options_received *mp_opt,
666 struct sock *ssk,
667 struct request_sock *req);
668 void mptcp_get_options(const struct sk_buff *skb,
669 struct mptcp_options_received *mp_opt);
670
671 void mptcp_finish_connect(struct sock *sk);
672 void __mptcp_set_connected(struct sock *sk);
673 void mptcp_reset_tout_timer(struct mptcp_sock *msk, unsigned long fail_tout);
674
mptcp_stop_tout_timer(struct sock * sk)675 static inline void mptcp_stop_tout_timer(struct sock *sk)
676 {
677 if (!inet_csk(sk)->icsk_mtup.probe_timestamp)
678 return;
679
680 sk_stop_timer(sk, &sk->sk_timer);
681 inet_csk(sk)->icsk_mtup.probe_timestamp = 0;
682 }
683
mptcp_set_close_tout(struct sock * sk,unsigned long tout)684 static inline void mptcp_set_close_tout(struct sock *sk, unsigned long tout)
685 {
686 /* avoid 0 timestamp, as that means no close timeout */
687 inet_csk(sk)->icsk_mtup.probe_timestamp = tout ? : 1;
688 }
689
mptcp_start_tout_timer(struct sock * sk)690 static inline void mptcp_start_tout_timer(struct sock *sk)
691 {
692 mptcp_set_close_tout(sk, tcp_jiffies32);
693 mptcp_reset_tout_timer(mptcp_sk(sk), 0);
694 }
695
mptcp_is_fully_established(struct sock * sk)696 static inline bool mptcp_is_fully_established(struct sock *sk)
697 {
698 return inet_sk_state_load(sk) == TCP_ESTABLISHED &&
699 READ_ONCE(mptcp_sk(sk)->fully_established);
700 }
701 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk);
702 void mptcp_data_ready(struct sock *sk, struct sock *ssk);
703 bool mptcp_finish_join(struct sock *sk);
704 bool mptcp_schedule_work(struct sock *sk);
705 int mptcp_setsockopt(struct sock *sk, int level, int optname,
706 sockptr_t optval, unsigned int optlen);
707 int mptcp_getsockopt(struct sock *sk, int level, int optname,
708 char __user *optval, int __user *option);
709
710 u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq);
mptcp_expand_seq(u64 old_seq,u64 cur_seq,bool use_64bit)711 static inline u64 mptcp_expand_seq(u64 old_seq, u64 cur_seq, bool use_64bit)
712 {
713 if (use_64bit)
714 return cur_seq;
715
716 return __mptcp_expand_seq(old_seq, cur_seq);
717 }
718 void __mptcp_check_push(struct sock *sk, struct sock *ssk);
719 void __mptcp_data_acked(struct sock *sk);
720 void __mptcp_error_report(struct sock *sk);
721 void mptcp_subflow_eof(struct sock *sk);
722 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit);
mptcp_data_fin_enabled(const struct mptcp_sock * msk)723 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk)
724 {
725 return READ_ONCE(msk->snd_data_fin_enable) &&
726 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt);
727 }
728
mptcp_propagate_sndbuf(struct sock * sk,struct sock * ssk)729 static inline bool mptcp_propagate_sndbuf(struct sock *sk, struct sock *ssk)
730 {
731 if ((sk->sk_userlocks & SOCK_SNDBUF_LOCK) || ssk->sk_sndbuf <= READ_ONCE(sk->sk_sndbuf))
732 return false;
733
734 WRITE_ONCE(sk->sk_sndbuf, ssk->sk_sndbuf);
735 return true;
736 }
737
mptcp_write_space(struct sock * sk)738 static inline void mptcp_write_space(struct sock *sk)
739 {
740 if (sk_stream_is_writeable(sk)) {
741 /* pairs with memory barrier in mptcp_poll */
742 smp_mb();
743 if (test_and_clear_bit(MPTCP_NOSPACE, &mptcp_sk(sk)->flags))
744 sk_stream_write_space(sk);
745 }
746 }
747
748 void mptcp_destroy_common(struct mptcp_sock *msk, unsigned int flags);
749
750 #define MPTCP_TOKEN_MAX_RETRIES 4
751
752 void __init mptcp_token_init(void);
mptcp_token_init_request(struct request_sock * req)753 static inline void mptcp_token_init_request(struct request_sock *req)
754 {
755 mptcp_subflow_rsk(req)->token_node.pprev = NULL;
756 }
757
758 int mptcp_token_new_request(struct request_sock *req);
759 void mptcp_token_destroy_request(struct request_sock *req);
760 int mptcp_token_new_connect(struct sock *sk);
761 void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
762 struct mptcp_sock *msk);
763 bool mptcp_token_exists(u32 token);
764 struct mptcp_sock *mptcp_token_get_sock(struct net *net, u32 token);
765 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
766 long *s_num);
767 void mptcp_token_destroy(struct mptcp_sock *msk);
768
769 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);
770
771 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac);
772 __sum16 __mptcp_make_csum(u64 data_seq, u32 subflow_seq, u16 data_len, __wsum sum);
773
774 void __init mptcp_pm_init(void);
775 void mptcp_pm_data_init(struct mptcp_sock *msk);
776 void mptcp_pm_data_reset(struct mptcp_sock *msk);
777 int mptcp_pm_parse_addr(struct nlattr *attr, struct genl_info *info,
778 struct mptcp_addr_info *addr);
779 int mptcp_pm_parse_entry(struct nlattr *attr, struct genl_info *info,
780 bool require_family,
781 struct mptcp_pm_addr_entry *entry);
782 bool mptcp_pm_addr_families_match(const struct sock *sk,
783 const struct mptcp_addr_info *loc,
784 const struct mptcp_addr_info *rem);
785 void mptcp_pm_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
786 void mptcp_pm_nl_subflow_chk_stale(const struct mptcp_sock *msk, struct sock *ssk);
787 void mptcp_pm_new_connection(struct mptcp_sock *msk, const struct sock *ssk, int server_side);
788 void mptcp_pm_fully_established(struct mptcp_sock *msk, const struct sock *ssk, gfp_t gfp);
789 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk);
790 void mptcp_pm_connection_closed(struct mptcp_sock *msk);
791 void mptcp_pm_subflow_established(struct mptcp_sock *msk);
792 bool mptcp_pm_nl_check_work_pending(struct mptcp_sock *msk);
793 void mptcp_pm_subflow_check_next(struct mptcp_sock *msk, const struct sock *ssk,
794 const struct mptcp_subflow_context *subflow);
795 void mptcp_pm_add_addr_received(const struct sock *ssk,
796 const struct mptcp_addr_info *addr);
797 void mptcp_pm_add_addr_echoed(struct mptcp_sock *msk,
798 const struct mptcp_addr_info *addr);
799 void mptcp_pm_add_addr_send_ack(struct mptcp_sock *msk);
800 void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk);
801 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
802 const struct mptcp_rm_list *rm_list);
803 void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
804 void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
805 int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
806 struct mptcp_addr_info *addr,
807 struct mptcp_addr_info *rem,
808 u8 bkup);
809 bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
810 const struct mptcp_pm_addr_entry *entry);
811 void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
812 bool mptcp_pm_sport_in_anno_list(struct mptcp_sock *msk, const struct sock *sk);
813 struct mptcp_pm_add_entry *
814 mptcp_pm_del_add_timer(struct mptcp_sock *msk,
815 const struct mptcp_addr_info *addr, bool check_id);
816 struct mptcp_pm_add_entry *
817 mptcp_lookup_anno_list_by_saddr(const struct mptcp_sock *msk,
818 const struct mptcp_addr_info *addr);
819 int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
820 unsigned int id,
821 u8 *flags, int *ifindex);
822 int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
823 unsigned int id,
824 u8 *flags, int *ifindex);
825 int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
826 struct mptcp_pm_addr_entry *loc,
827 struct mptcp_pm_addr_entry *rem, u8 bkup);
828 int mptcp_pm_announce_addr(struct mptcp_sock *msk,
829 const struct mptcp_addr_info *addr,
830 bool echo);
831 int mptcp_pm_remove_addr(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
832 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, const struct mptcp_rm_list *rm_list);
833 void mptcp_pm_remove_addrs(struct mptcp_sock *msk, struct list_head *rm_list);
834 void mptcp_pm_remove_addrs_and_subflows(struct mptcp_sock *msk,
835 struct list_head *rm_list);
836
837 void mptcp_free_local_addr_list(struct mptcp_sock *msk);
838 int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info);
839 int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info);
840 int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info);
841 int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info);
842
843 void mptcp_event(enum mptcp_event_type type, const struct mptcp_sock *msk,
844 const struct sock *ssk, gfp_t gfp);
845 void mptcp_event_addr_announced(const struct sock *ssk, const struct mptcp_addr_info *info);
846 void mptcp_event_addr_removed(const struct mptcp_sock *msk, u8 id);
847 bool mptcp_userspace_pm_active(const struct mptcp_sock *msk);
848
mptcp_pm_should_add_signal(struct mptcp_sock * msk)849 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk)
850 {
851 return READ_ONCE(msk->pm.addr_signal) &
852 (BIT(MPTCP_ADD_ADDR_SIGNAL) | BIT(MPTCP_ADD_ADDR_ECHO));
853 }
854
mptcp_pm_should_add_signal_addr(struct mptcp_sock * msk)855 static inline bool mptcp_pm_should_add_signal_addr(struct mptcp_sock *msk)
856 {
857 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_SIGNAL);
858 }
859
mptcp_pm_should_add_signal_echo(struct mptcp_sock * msk)860 static inline bool mptcp_pm_should_add_signal_echo(struct mptcp_sock *msk)
861 {
862 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_ADD_ADDR_ECHO);
863 }
864
mptcp_pm_should_rm_signal(struct mptcp_sock * msk)865 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk)
866 {
867 return READ_ONCE(msk->pm.addr_signal) & BIT(MPTCP_RM_ADDR_SIGNAL);
868 }
869
mptcp_pm_is_userspace(const struct mptcp_sock * msk)870 static inline bool mptcp_pm_is_userspace(const struct mptcp_sock *msk)
871 {
872 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_USERSPACE;
873 }
874
mptcp_pm_is_kernel(const struct mptcp_sock * msk)875 static inline bool mptcp_pm_is_kernel(const struct mptcp_sock *msk)
876 {
877 return READ_ONCE(msk->pm.pm_type) == MPTCP_PM_TYPE_KERNEL;
878 }
879
mptcp_add_addr_len(int family,bool echo,bool port)880 static inline unsigned int mptcp_add_addr_len(int family, bool echo, bool port)
881 {
882 u8 len = TCPOLEN_MPTCP_ADD_ADDR_BASE;
883
884 if (family == AF_INET6)
885 len = TCPOLEN_MPTCP_ADD_ADDR6_BASE;
886 if (!echo)
887 len += MPTCPOPT_THMAC_LEN;
888 /* account for 2 trailing 'nop' options */
889 if (port)
890 len += TCPOLEN_MPTCP_PORT_LEN + TCPOLEN_MPTCP_PORT_ALIGN;
891
892 return len;
893 }
894
mptcp_rm_addr_len(const struct mptcp_rm_list * rm_list)895 static inline int mptcp_rm_addr_len(const struct mptcp_rm_list *rm_list)
896 {
897 if (rm_list->nr == 0 || rm_list->nr > MPTCP_RM_IDS_MAX)
898 return -EINVAL;
899
900 return TCPOLEN_MPTCP_RM_ADDR_BASE + roundup(rm_list->nr - 1, 4) + 1;
901 }
902
903 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, const struct sk_buff *skb,
904 unsigned int opt_size, unsigned int remaining,
905 struct mptcp_addr_info *addr, bool *echo,
906 bool *drop_other_suboptions);
907 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining,
908 struct mptcp_rm_list *rm_list);
909 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
910 int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk, struct mptcp_addr_info *skc);
911
912 void __init mptcp_pm_nl_init(void);
913 void mptcp_pm_nl_work(struct mptcp_sock *msk);
914 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk,
915 const struct mptcp_rm_list *rm_list);
916 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc);
917 unsigned int mptcp_pm_get_add_addr_signal_max(const struct mptcp_sock *msk);
918 unsigned int mptcp_pm_get_add_addr_accept_max(const struct mptcp_sock *msk);
919 unsigned int mptcp_pm_get_subflows_max(const struct mptcp_sock *msk);
920 unsigned int mptcp_pm_get_local_addr_max(const struct mptcp_sock *msk);
921
922 /* called under PM lock */
__mptcp_pm_close_subflow(struct mptcp_sock * msk)923 static inline void __mptcp_pm_close_subflow(struct mptcp_sock *msk)
924 {
925 if (--msk->pm.subflows < mptcp_pm_get_subflows_max(msk))
926 WRITE_ONCE(msk->pm.accept_subflow, true);
927 }
928
mptcp_pm_close_subflow(struct mptcp_sock * msk)929 static inline void mptcp_pm_close_subflow(struct mptcp_sock *msk)
930 {
931 spin_lock_bh(&msk->pm.lock);
932 __mptcp_pm_close_subflow(msk);
933 spin_unlock_bh(&msk->pm.lock);
934 }
935
936 void mptcp_sockopt_sync(struct mptcp_sock *msk, struct sock *ssk);
937 void mptcp_sockopt_sync_locked(struct mptcp_sock *msk, struct sock *ssk);
938
mptcp_get_ext(const struct sk_buff * skb)939 static inline struct mptcp_ext *mptcp_get_ext(const struct sk_buff *skb)
940 {
941 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP);
942 }
943
944 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops);
945
__mptcp_check_fallback(const struct mptcp_sock * msk)946 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk)
947 {
948 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags);
949 }
950
mptcp_check_fallback(const struct sock * sk)951 static inline bool mptcp_check_fallback(const struct sock *sk)
952 {
953 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
954 struct mptcp_sock *msk = mptcp_sk(subflow->conn);
955
956 return __mptcp_check_fallback(msk);
957 }
958
__mptcp_do_fallback(struct mptcp_sock * msk)959 static inline void __mptcp_do_fallback(struct mptcp_sock *msk)
960 {
961 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) {
962 pr_debug("TCP fallback already done (msk=%p)", msk);
963 return;
964 }
965 set_bit(MPTCP_FALLBACK_DONE, &msk->flags);
966 }
967
mptcp_do_fallback(struct sock * ssk)968 static inline void mptcp_do_fallback(struct sock *ssk)
969 {
970 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
971 struct sock *sk = subflow->conn;
972 struct mptcp_sock *msk;
973
974 msk = mptcp_sk(sk);
975 __mptcp_do_fallback(msk);
976 if (READ_ONCE(msk->snd_data_fin_enable) && !(ssk->sk_shutdown & SEND_SHUTDOWN)) {
977 gfp_t saved_allocation = ssk->sk_allocation;
978
979 /* we are in a atomic (BH) scope, override ssk default for data
980 * fin allocation
981 */
982 ssk->sk_allocation = GFP_ATOMIC;
983 ssk->sk_shutdown |= SEND_SHUTDOWN;
984 tcp_shutdown(ssk, SEND_SHUTDOWN);
985 ssk->sk_allocation = saved_allocation;
986 }
987 }
988
989 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a)
990
mptcp_check_infinite_map(struct sk_buff * skb)991 static inline bool mptcp_check_infinite_map(struct sk_buff *skb)
992 {
993 struct mptcp_ext *mpext;
994
995 mpext = skb ? mptcp_get_ext(skb) : NULL;
996 if (mpext && mpext->infinite_map)
997 return true;
998
999 return false;
1000 }
1001
is_active_ssk(struct mptcp_subflow_context * subflow)1002 static inline bool is_active_ssk(struct mptcp_subflow_context *subflow)
1003 {
1004 return (subflow->request_mptcp || subflow->request_join);
1005 }
1006
subflow_simultaneous_connect(struct sock * sk)1007 static inline bool subflow_simultaneous_connect(struct sock *sk)
1008 {
1009 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
1010
1011 return sk->sk_state == TCP_ESTABLISHED &&
1012 is_active_ssk(subflow) &&
1013 !subflow->conn_finished;
1014 }
1015
1016 #ifdef CONFIG_SYN_COOKIES
1017 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
1018 struct sk_buff *skb);
1019 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
1020 struct sk_buff *skb);
1021 void __init mptcp_join_cookie_init(void);
1022 #else
1023 static inline void
subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock * subflow_req,struct sk_buff * skb)1024 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req,
1025 struct sk_buff *skb) {}
1026 static inline bool
mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock * subflow_req,struct sk_buff * skb)1027 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req,
1028 struct sk_buff *skb)
1029 {
1030 return false;
1031 }
1032
mptcp_join_cookie_init(void)1033 static inline void mptcp_join_cookie_init(void) {}
1034 #endif
1035
1036 #endif /* __MPTCP_PROTOCOL_H */
1037