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 14 #define MPTCP_SUPPORTED_VERSION 1 15 16 /* MPTCP option bits */ 17 #define OPTION_MPTCP_MPC_SYN BIT(0) 18 #define OPTION_MPTCP_MPC_SYNACK BIT(1) 19 #define OPTION_MPTCP_MPC_ACK BIT(2) 20 #define OPTION_MPTCP_MPJ_SYN BIT(3) 21 #define OPTION_MPTCP_MPJ_SYNACK BIT(4) 22 #define OPTION_MPTCP_MPJ_ACK BIT(5) 23 #define OPTION_MPTCP_ADD_ADDR BIT(6) 24 #define OPTION_MPTCP_ADD_ADDR6 BIT(7) 25 #define OPTION_MPTCP_RM_ADDR BIT(8) 26 27 /* MPTCP option subtypes */ 28 #define MPTCPOPT_MP_CAPABLE 0 29 #define MPTCPOPT_MP_JOIN 1 30 #define MPTCPOPT_DSS 2 31 #define MPTCPOPT_ADD_ADDR 3 32 #define MPTCPOPT_RM_ADDR 4 33 #define MPTCPOPT_MP_PRIO 5 34 #define MPTCPOPT_MP_FAIL 6 35 #define MPTCPOPT_MP_FASTCLOSE 7 36 37 /* MPTCP suboption lengths */ 38 #define TCPOLEN_MPTCP_MPC_SYN 4 39 #define TCPOLEN_MPTCP_MPC_SYNACK 12 40 #define TCPOLEN_MPTCP_MPC_ACK 20 41 #define TCPOLEN_MPTCP_MPC_ACK_DATA 22 42 #define TCPOLEN_MPTCP_MPJ_SYN 12 43 #define TCPOLEN_MPTCP_MPJ_SYNACK 16 44 #define TCPOLEN_MPTCP_MPJ_ACK 24 45 #define TCPOLEN_MPTCP_DSS_BASE 4 46 #define TCPOLEN_MPTCP_DSS_ACK32 4 47 #define TCPOLEN_MPTCP_DSS_ACK64 8 48 #define TCPOLEN_MPTCP_DSS_MAP32 10 49 #define TCPOLEN_MPTCP_DSS_MAP64 14 50 #define TCPOLEN_MPTCP_DSS_CHECKSUM 2 51 #define TCPOLEN_MPTCP_ADD_ADDR 16 52 #define TCPOLEN_MPTCP_ADD_ADDR_PORT 18 53 #define TCPOLEN_MPTCP_ADD_ADDR_BASE 8 54 #define TCPOLEN_MPTCP_ADD_ADDR_BASE_PORT 10 55 #define TCPOLEN_MPTCP_ADD_ADDR6 28 56 #define TCPOLEN_MPTCP_ADD_ADDR6_PORT 30 57 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE 20 58 #define TCPOLEN_MPTCP_ADD_ADDR6_BASE_PORT 22 59 #define TCPOLEN_MPTCP_PORT_LEN 2 60 #define TCPOLEN_MPTCP_RM_ADDR_BASE 4 61 62 /* MPTCP MP_JOIN flags */ 63 #define MPTCPOPT_BACKUP BIT(0) 64 #define MPTCPOPT_HMAC_LEN 20 65 #define MPTCPOPT_THMAC_LEN 8 66 67 /* MPTCP MP_CAPABLE flags */ 68 #define MPTCP_VERSION_MASK (0x0F) 69 #define MPTCP_CAP_CHECKSUM_REQD BIT(7) 70 #define MPTCP_CAP_EXTENSIBILITY BIT(6) 71 #define MPTCP_CAP_HMAC_SHA256 BIT(0) 72 #define MPTCP_CAP_FLAG_MASK (0x3F) 73 74 /* MPTCP DSS flags */ 75 #define MPTCP_DSS_DATA_FIN BIT(4) 76 #define MPTCP_DSS_DSN64 BIT(3) 77 #define MPTCP_DSS_HAS_MAP BIT(2) 78 #define MPTCP_DSS_ACK64 BIT(1) 79 #define MPTCP_DSS_HAS_ACK BIT(0) 80 #define MPTCP_DSS_FLAG_MASK (0x1F) 81 82 /* MPTCP ADD_ADDR flags */ 83 #define MPTCP_ADDR_ECHO BIT(0) 84 #define MPTCP_ADDR_IPVERSION_4 4 85 #define MPTCP_ADDR_IPVERSION_6 6 86 87 /* MPTCP socket flags */ 88 #define MPTCP_DATA_READY 0 89 #define MPTCP_NOSPACE 1 90 #define MPTCP_WORK_RTX 2 91 #define MPTCP_WORK_EOF 3 92 #define MPTCP_FALLBACK_DONE 4 93 #define MPTCP_WORK_CLOSE_SUBFLOW 5 94 #define MPTCP_WORKER_RUNNING 6 95 96 static inline bool before64(__u64 seq1, __u64 seq2) 97 { 98 return (__s64)(seq1 - seq2) < 0; 99 } 100 101 #define after64(seq2, seq1) before64(seq1, seq2) 102 103 struct mptcp_options_received { 104 u64 sndr_key; 105 u64 rcvr_key; 106 u64 data_ack; 107 u64 data_seq; 108 u32 subflow_seq; 109 u16 data_len; 110 u16 mp_capable : 1, 111 mp_join : 1, 112 dss : 1, 113 add_addr : 1, 114 rm_addr : 1, 115 family : 4, 116 echo : 1, 117 backup : 1; 118 u32 token; 119 u32 nonce; 120 u64 thmac; 121 u8 hmac[20]; 122 u8 join_id; 123 u8 use_map:1, 124 dsn64:1, 125 data_fin:1, 126 use_ack:1, 127 ack64:1, 128 mpc_map:1, 129 __unused:2; 130 u8 addr_id; 131 u8 rm_id; 132 union { 133 struct in_addr addr; 134 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 135 struct in6_addr addr6; 136 #endif 137 }; 138 u64 ahmac; 139 u16 port; 140 }; 141 142 static inline __be32 mptcp_option(u8 subopt, u8 len, u8 nib, u8 field) 143 { 144 return htonl((TCPOPT_MPTCP << 24) | (len << 16) | (subopt << 12) | 145 ((nib & 0xF) << 8) | field); 146 } 147 148 struct mptcp_addr_info { 149 sa_family_t family; 150 __be16 port; 151 u8 id; 152 u8 flags; 153 int ifindex; 154 union { 155 struct in_addr addr; 156 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 157 struct in6_addr addr6; 158 #endif 159 }; 160 }; 161 162 enum mptcp_pm_status { 163 MPTCP_PM_ADD_ADDR_RECEIVED, 164 MPTCP_PM_RM_ADDR_RECEIVED, 165 MPTCP_PM_ESTABLISHED, 166 MPTCP_PM_SUBFLOW_ESTABLISHED, 167 }; 168 169 struct mptcp_pm_data { 170 struct mptcp_addr_info local; 171 struct mptcp_addr_info remote; 172 struct list_head anno_list; 173 174 spinlock_t lock; /*protects the whole PM data */ 175 176 bool add_addr_signal; 177 bool rm_addr_signal; 178 bool server_side; 179 bool work_pending; 180 bool accept_addr; 181 bool accept_subflow; 182 bool add_addr_echo; 183 u8 add_addr_signaled; 184 u8 add_addr_accepted; 185 u8 local_addr_used; 186 u8 subflows; 187 u8 add_addr_signal_max; 188 u8 add_addr_accept_max; 189 u8 local_addr_max; 190 u8 subflows_max; 191 u8 status; 192 u8 rm_id; 193 }; 194 195 struct mptcp_data_frag { 196 struct list_head list; 197 u64 data_seq; 198 u16 data_len; 199 u16 offset; 200 u16 overhead; 201 u16 already_sent; 202 struct page *page; 203 }; 204 205 /* MPTCP connection sock */ 206 struct mptcp_sock { 207 /* inet_connection_sock must be the first member */ 208 struct inet_connection_sock sk; 209 u64 local_key; 210 u64 remote_key; 211 u64 write_seq; 212 u64 snd_nxt; 213 u64 ack_seq; 214 u64 rcv_data_fin_seq; 215 struct sock *last_snd; 216 int snd_burst; 217 atomic64_t snd_una; 218 atomic64_t wnd_end; 219 unsigned long timer_ival; 220 u32 token; 221 unsigned long flags; 222 bool can_ack; 223 bool fully_established; 224 bool rcv_data_fin; 225 bool snd_data_fin_enable; 226 bool use_64bit_ack; /* Set when we received a 64-bit DSN */ 227 spinlock_t join_list_lock; 228 struct work_struct work; 229 struct sk_buff *ooo_last_skb; 230 struct rb_root out_of_order_queue; 231 struct list_head conn_list; 232 struct list_head rtx_queue; 233 struct mptcp_data_frag *first_pending; 234 struct list_head join_list; 235 struct skb_ext *cached_ext; /* for the next sendmsg */ 236 struct socket *subflow; /* outgoing connect/listener/!mp_capable */ 237 struct sock *first; 238 struct mptcp_pm_data pm; 239 struct { 240 u32 space; /* bytes copied in last measurement window */ 241 u32 copied; /* bytes copied in this measurement window */ 242 u64 time; /* start time of measurement window */ 243 u64 rtt_us; /* last maximum rtt of subflows */ 244 } rcvq_space; 245 }; 246 247 #define mptcp_for_each_subflow(__msk, __subflow) \ 248 list_for_each_entry(__subflow, &((__msk)->conn_list), node) 249 250 static inline struct mptcp_sock *mptcp_sk(const struct sock *sk) 251 { 252 return (struct mptcp_sock *)sk; 253 } 254 255 static inline struct mptcp_data_frag *mptcp_send_head(const struct sock *sk) 256 { 257 const struct mptcp_sock *msk = mptcp_sk(sk); 258 259 return READ_ONCE(msk->first_pending); 260 } 261 262 static inline struct mptcp_data_frag *mptcp_send_next(struct sock *sk) 263 { 264 struct mptcp_sock *msk = mptcp_sk(sk); 265 struct mptcp_data_frag *cur; 266 267 cur = msk->first_pending; 268 return list_is_last(&cur->list, &msk->rtx_queue) ? NULL : 269 list_next_entry(cur, list); 270 } 271 272 static inline struct mptcp_data_frag *mptcp_pending_tail(const struct sock *sk) 273 { 274 struct mptcp_sock *msk = mptcp_sk(sk); 275 276 if (!msk->first_pending) 277 return NULL; 278 279 if (WARN_ON_ONCE(list_empty(&msk->rtx_queue))) 280 return NULL; 281 282 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 283 } 284 285 static inline struct mptcp_data_frag *mptcp_rtx_tail(const struct sock *sk) 286 { 287 struct mptcp_sock *msk = mptcp_sk(sk); 288 289 if (!before64(msk->snd_nxt, atomic64_read(&msk->snd_una))) 290 return NULL; 291 292 return list_last_entry(&msk->rtx_queue, struct mptcp_data_frag, list); 293 } 294 295 static inline struct mptcp_data_frag *mptcp_rtx_head(const struct sock *sk) 296 { 297 struct mptcp_sock *msk = mptcp_sk(sk); 298 299 return list_first_entry_or_null(&msk->rtx_queue, struct mptcp_data_frag, list); 300 } 301 302 struct mptcp_subflow_request_sock { 303 struct tcp_request_sock sk; 304 u16 mp_capable : 1, 305 mp_join : 1, 306 backup : 1; 307 u8 local_id; 308 u8 remote_id; 309 u64 local_key; 310 u64 idsn; 311 u32 token; 312 u32 ssn_offset; 313 u64 thmac; 314 u32 local_nonce; 315 u32 remote_nonce; 316 struct mptcp_sock *msk; 317 struct hlist_nulls_node token_node; 318 }; 319 320 static inline struct mptcp_subflow_request_sock * 321 mptcp_subflow_rsk(const struct request_sock *rsk) 322 { 323 return (struct mptcp_subflow_request_sock *)rsk; 324 } 325 326 enum mptcp_data_avail { 327 MPTCP_SUBFLOW_NODATA, 328 MPTCP_SUBFLOW_DATA_AVAIL, 329 MPTCP_SUBFLOW_OOO_DATA 330 }; 331 332 /* MPTCP subflow context */ 333 struct mptcp_subflow_context { 334 struct list_head node;/* conn_list of subflows */ 335 u64 local_key; 336 u64 remote_key; 337 u64 idsn; 338 u64 map_seq; 339 u32 snd_isn; 340 u32 token; 341 u32 rel_write_seq; 342 u32 map_subflow_seq; 343 u32 ssn_offset; 344 u32 map_data_len; 345 u32 request_mptcp : 1, /* send MP_CAPABLE */ 346 request_join : 1, /* send MP_JOIN */ 347 request_bkup : 1, 348 mp_capable : 1, /* remote is MPTCP capable */ 349 mp_join : 1, /* remote is JOINing */ 350 fully_established : 1, /* path validated */ 351 pm_notified : 1, /* PM hook called for established status */ 352 conn_finished : 1, 353 map_valid : 1, 354 mpc_map : 1, 355 backup : 1, 356 rx_eof : 1, 357 can_ack : 1, /* only after processing the remote a key */ 358 disposable : 1; /* ctx can be free at ulp release time */ 359 enum mptcp_data_avail data_avail; 360 u32 remote_nonce; 361 u64 thmac; 362 u32 local_nonce; 363 u32 remote_token; 364 u8 hmac[MPTCPOPT_HMAC_LEN]; 365 u8 local_id; 366 u8 remote_id; 367 368 struct sock *tcp_sock; /* tcp sk backpointer */ 369 struct sock *conn; /* parent mptcp_sock */ 370 const struct inet_connection_sock_af_ops *icsk_af_ops; 371 void (*tcp_data_ready)(struct sock *sk); 372 void (*tcp_state_change)(struct sock *sk); 373 void (*tcp_write_space)(struct sock *sk); 374 375 struct rcu_head rcu; 376 }; 377 378 static inline struct mptcp_subflow_context * 379 mptcp_subflow_ctx(const struct sock *sk) 380 { 381 struct inet_connection_sock *icsk = inet_csk(sk); 382 383 /* Use RCU on icsk_ulp_data only for sock diag code */ 384 return (__force struct mptcp_subflow_context *)icsk->icsk_ulp_data; 385 } 386 387 static inline struct sock * 388 mptcp_subflow_tcp_sock(const struct mptcp_subflow_context *subflow) 389 { 390 return subflow->tcp_sock; 391 } 392 393 static inline u64 394 mptcp_subflow_get_map_offset(const struct mptcp_subflow_context *subflow) 395 { 396 return tcp_sk(mptcp_subflow_tcp_sock(subflow))->copied_seq - 397 subflow->ssn_offset - 398 subflow->map_subflow_seq; 399 } 400 401 static inline u64 402 mptcp_subflow_get_mapped_dsn(const struct mptcp_subflow_context *subflow) 403 { 404 return subflow->map_seq + mptcp_subflow_get_map_offset(subflow); 405 } 406 407 int mptcp_is_enabled(struct net *net); 408 unsigned int mptcp_get_add_addr_timeout(struct net *net); 409 void mptcp_subflow_fully_established(struct mptcp_subflow_context *subflow, 410 struct mptcp_options_received *mp_opt); 411 bool mptcp_subflow_data_available(struct sock *sk); 412 void __init mptcp_subflow_init(void); 413 void mptcp_subflow_shutdown(struct sock *sk, struct sock *ssk, int how); 414 void __mptcp_close_ssk(struct sock *sk, struct sock *ssk, 415 struct mptcp_subflow_context *subflow); 416 void mptcp_subflow_reset(struct sock *ssk); 417 418 /* called with sk socket lock held */ 419 int __mptcp_subflow_connect(struct sock *sk, const struct mptcp_addr_info *loc, 420 const struct mptcp_addr_info *remote); 421 int mptcp_subflow_create_socket(struct sock *sk, struct socket **new_sock); 422 423 static inline void mptcp_subflow_tcp_fallback(struct sock *sk, 424 struct mptcp_subflow_context *ctx) 425 { 426 sk->sk_data_ready = ctx->tcp_data_ready; 427 sk->sk_state_change = ctx->tcp_state_change; 428 sk->sk_write_space = ctx->tcp_write_space; 429 430 inet_csk(sk)->icsk_af_ops = ctx->icsk_af_ops; 431 } 432 433 void __init mptcp_proto_init(void); 434 #if IS_ENABLED(CONFIG_MPTCP_IPV6) 435 int __init mptcp_proto_v6_init(void); 436 #endif 437 438 struct sock *mptcp_sk_clone(const struct sock *sk, 439 const struct mptcp_options_received *mp_opt, 440 struct request_sock *req); 441 void mptcp_get_options(const struct sk_buff *skb, 442 struct mptcp_options_received *mp_opt); 443 444 void mptcp_finish_connect(struct sock *sk); 445 static inline bool mptcp_is_fully_established(struct sock *sk) 446 { 447 return inet_sk_state_load(sk) == TCP_ESTABLISHED && 448 READ_ONCE(mptcp_sk(sk)->fully_established); 449 } 450 void mptcp_rcv_space_init(struct mptcp_sock *msk, const struct sock *ssk); 451 void mptcp_data_ready(struct sock *sk, struct sock *ssk); 452 bool mptcp_finish_join(struct sock *sk); 453 bool mptcp_schedule_work(struct sock *sk); 454 void mptcp_data_acked(struct sock *sk); 455 void mptcp_subflow_eof(struct sock *sk); 456 bool mptcp_update_rcv_data_fin(struct mptcp_sock *msk, u64 data_fin_seq, bool use_64bit); 457 static inline bool mptcp_data_fin_enabled(const struct mptcp_sock *msk) 458 { 459 return READ_ONCE(msk->snd_data_fin_enable) && 460 READ_ONCE(msk->write_seq) == READ_ONCE(msk->snd_nxt); 461 } 462 463 void mptcp_destroy_common(struct mptcp_sock *msk); 464 465 void __init mptcp_token_init(void); 466 static inline void mptcp_token_init_request(struct request_sock *req) 467 { 468 mptcp_subflow_rsk(req)->token_node.pprev = NULL; 469 } 470 471 int mptcp_token_new_request(struct request_sock *req); 472 void mptcp_token_destroy_request(struct request_sock *req); 473 int mptcp_token_new_connect(struct sock *sk); 474 void mptcp_token_accept(struct mptcp_subflow_request_sock *r, 475 struct mptcp_sock *msk); 476 bool mptcp_token_exists(u32 token); 477 struct mptcp_sock *mptcp_token_get_sock(u32 token); 478 struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot, 479 long *s_num); 480 void mptcp_token_destroy(struct mptcp_sock *msk); 481 482 void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn); 483 484 void mptcp_crypto_hmac_sha(u64 key1, u64 key2, u8 *msg, int len, void *hmac); 485 486 void __init mptcp_pm_init(void); 487 void mptcp_pm_data_init(struct mptcp_sock *msk); 488 void mptcp_pm_new_connection(struct mptcp_sock *msk, int server_side); 489 void mptcp_pm_fully_established(struct mptcp_sock *msk); 490 bool mptcp_pm_allow_new_subflow(struct mptcp_sock *msk); 491 void mptcp_pm_connection_closed(struct mptcp_sock *msk); 492 void mptcp_pm_subflow_established(struct mptcp_sock *msk, 493 struct mptcp_subflow_context *subflow); 494 void mptcp_pm_subflow_closed(struct mptcp_sock *msk, u8 id); 495 void mptcp_pm_add_addr_received(struct mptcp_sock *msk, 496 const struct mptcp_addr_info *addr); 497 void mptcp_pm_rm_addr_received(struct mptcp_sock *msk, u8 rm_id); 498 void mptcp_pm_free_anno_list(struct mptcp_sock *msk); 499 struct mptcp_pm_add_entry * 500 mptcp_pm_del_add_timer(struct mptcp_sock *msk, 501 struct mptcp_addr_info *addr); 502 503 int mptcp_pm_announce_addr(struct mptcp_sock *msk, 504 const struct mptcp_addr_info *addr, 505 bool echo); 506 int mptcp_pm_remove_addr(struct mptcp_sock *msk, u8 local_id); 507 int mptcp_pm_remove_subflow(struct mptcp_sock *msk, u8 local_id); 508 509 static inline bool mptcp_pm_should_add_signal(struct mptcp_sock *msk) 510 { 511 return READ_ONCE(msk->pm.add_addr_signal); 512 } 513 514 static inline bool mptcp_pm_should_rm_signal(struct mptcp_sock *msk) 515 { 516 return READ_ONCE(msk->pm.rm_addr_signal); 517 } 518 519 static inline unsigned int mptcp_add_addr_len(int family, bool echo) 520 { 521 if (family == AF_INET) 522 return echo ? TCPOLEN_MPTCP_ADD_ADDR_BASE 523 : TCPOLEN_MPTCP_ADD_ADDR; 524 return echo ? TCPOLEN_MPTCP_ADD_ADDR6_BASE : TCPOLEN_MPTCP_ADD_ADDR6; 525 } 526 527 bool mptcp_pm_add_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 528 struct mptcp_addr_info *saddr, bool *echo); 529 bool mptcp_pm_rm_addr_signal(struct mptcp_sock *msk, unsigned int remaining, 530 u8 *rm_id); 531 int mptcp_pm_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 532 533 void __init mptcp_pm_nl_init(void); 534 void mptcp_pm_nl_data_init(struct mptcp_sock *msk); 535 void mptcp_pm_nl_fully_established(struct mptcp_sock *msk); 536 void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk); 537 void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk); 538 void mptcp_pm_nl_rm_addr_received(struct mptcp_sock *msk); 539 void mptcp_pm_nl_rm_subflow_received(struct mptcp_sock *msk, u8 rm_id); 540 int mptcp_pm_nl_get_local_id(struct mptcp_sock *msk, struct sock_common *skc); 541 542 static inline struct mptcp_ext *mptcp_get_ext(struct sk_buff *skb) 543 { 544 return (struct mptcp_ext *)skb_ext_find(skb, SKB_EXT_MPTCP); 545 } 546 547 void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops); 548 549 static inline bool __mptcp_check_fallback(const struct mptcp_sock *msk) 550 { 551 return test_bit(MPTCP_FALLBACK_DONE, &msk->flags); 552 } 553 554 static inline bool mptcp_check_fallback(const struct sock *sk) 555 { 556 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 557 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 558 559 return __mptcp_check_fallback(msk); 560 } 561 562 static inline void __mptcp_do_fallback(struct mptcp_sock *msk) 563 { 564 if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) { 565 pr_debug("TCP fallback already done (msk=%p)", msk); 566 return; 567 } 568 set_bit(MPTCP_FALLBACK_DONE, &msk->flags); 569 } 570 571 static inline void mptcp_do_fallback(struct sock *sk) 572 { 573 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 574 struct mptcp_sock *msk = mptcp_sk(subflow->conn); 575 576 __mptcp_do_fallback(msk); 577 } 578 579 #define pr_fallback(a) pr_debug("%s:fallback to TCP (msk=%p)", __func__, a) 580 581 static inline bool subflow_simultaneous_connect(struct sock *sk) 582 { 583 struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk); 584 struct sock *parent = subflow->conn; 585 586 return sk->sk_state == TCP_ESTABLISHED && 587 !mptcp_sk(parent)->pm.server_side && 588 !subflow->conn_finished; 589 } 590 591 #ifdef CONFIG_SYN_COOKIES 592 void subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 593 struct sk_buff *skb); 594 bool mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 595 struct sk_buff *skb); 596 void __init mptcp_join_cookie_init(void); 597 #else 598 static inline void 599 subflow_init_req_cookie_join_save(const struct mptcp_subflow_request_sock *subflow_req, 600 struct sk_buff *skb) {} 601 static inline bool 602 mptcp_token_join_cookie_init_state(struct mptcp_subflow_request_sock *subflow_req, 603 struct sk_buff *skb) 604 { 605 return false; 606 } 607 608 static inline void mptcp_join_cookie_init(void) {} 609 #endif 610 611 #endif /* __MPTCP_PROTOCOL_H */ 612